CA1171167A - Mode selecting device for a video signal reproducing apparatus - Google Patents
Mode selecting device for a video signal reproducing apparatusInfo
- Publication number
- CA1171167A CA1171167A CA000387140A CA387140A CA1171167A CA 1171167 A CA1171167 A CA 1171167A CA 000387140 A CA000387140 A CA 000387140A CA 387140 A CA387140 A CA 387140A CA 1171167 A CA1171167 A CA 1171167A
- Authority
- CA
- Canada
- Prior art keywords
- rotation
- axial
- control shaft
- maintained
- axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
- G05G1/00—Controlling members, e.g. knobs or handles; Assemblies or arrangements thereof; Indicating position of controlling members
- G05G1/08—Controlling members for hand actuation by rotary movement, e.g. hand wheels
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
- G05G5/00—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member
- G05G5/06—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member for holding members in one or a limited number of definite positions only
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
- G05G9/00—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously
- G05G9/02—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only
- G05G9/04—Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, e.g. selectively, simultaneously the controlling member being movable in different independent ways, movement in each individual way actuating one controlled member only in which movement in two or more ways can occur simultaneously
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/02—Control of operating function, e.g. switching from recording to reproducing
- G11B15/10—Manually-operated control; Solenoid-operated control
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/02—Control of operating function, e.g. switching from recording to reproducing
- G11B15/10—Manually-operated control; Solenoid-operated control
- G11B15/103—Manually-operated control; Solenoid-operated control electrically operated
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/02—Control of operating function, e.g. switching from recording to reproducing
- G11B15/10—Manually-operated control; Solenoid-operated control
- G11B15/106—Manually-operated control; Solenoid-operated control mechanically operated
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/1808—Driving of both record carrier and head
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/44—Speed-changing arrangements; Reversing arrangements; Drive transfer means therefor
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/46—Controlling, regulating, or indicating speed
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/02—Control of operating function, e.g. switching from recording to reproducing
- G11B19/16—Manual control
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S200/00—Electricity: circuit makers and breakers
- Y10S200/34—Recording and reproducing
Abstract
ABSTRACT OF THE DISCLOSURE
A mode selecting device for a video tape reproducing apparatus of the type in which a magnetic tape is transported past rotary magnetic heads, includes a control shaft adapted to rotate about an axis, a control knob connected to the upper end of the control shaft for manually controlling the rotation of the control shaft, a photo-disk rotatable with the control shaft, a pair of photo-detectors associated with the photo-disk for detecting the rotational speed, the angular position and the direction of rotation of the control shaft about the axis, a latch mechanism for maintaining the control shaft in either a first or second axial position along the axis and for effecting successive change-overs between the first and second axial posi-tions in response to successive depressions of the control knob, the speed of movement of the tape being controlled in response to the detection of the angular position when the control shaft is maintained in the first axial position and the speed of move-ment of the tape being controlled in response to the detection of the rotational speed when the control shaft is maintained in the second axial position.
A mode selecting device for a video tape reproducing apparatus of the type in which a magnetic tape is transported past rotary magnetic heads, includes a control shaft adapted to rotate about an axis, a control knob connected to the upper end of the control shaft for manually controlling the rotation of the control shaft, a photo-disk rotatable with the control shaft, a pair of photo-detectors associated with the photo-disk for detecting the rotational speed, the angular position and the direction of rotation of the control shaft about the axis, a latch mechanism for maintaining the control shaft in either a first or second axial position along the axis and for effecting successive change-overs between the first and second axial posi-tions in response to successive depressions of the control knob, the speed of movement of the tape being controlled in response to the detection of the angular position when the control shaft is maintained in the first axial position and the speed of move-ment of the tape being controlled in response to the detection of the rotational speed when the control shaft is maintained in the second axial position.
Description
~ ` SO 1472 711~7 BACKGROUND OF THE INVEIlTIO~
.
Field of The Invention This invention relates generally to video signal reproducing apparatus and, more particularly, is directed to a device for selecting the mode of operation in a video signal reproducing apparatus.
Description of the Prior_ ~ hen an existing magnetic video tape recorder (VTR) of the helical scan type is o~erated in its reproducing or playback mode with a time base corrector, the speed at which the tape is transported or moved longitudinally between the supply and take-up reels may be varied while the rotary magnetic heads are rotated at the frame frequency so as to provide, on a monitor, a still, slow-motion or fast-motion reproduced picture in dependence on the speed of movement of the tape. Known VTRs have conventionally utilized electric circuits including, for example, an electro-magnetic clutch or a plunger-type solenoid, for selecting the above modes of operation, in addition to the rewind mode. Although such arrangements are relatively simple in construction, the electric circuits utilized therein are relatively expensive. It has also been proposed to utilize mechanical mode selector~ for selecting predetermined modes of operation. However, such latter selectors are inferior in operation ~o the aforementioned electric circuits and tend to be of a relatively large si~e, thereby occupying excessive space and resulting in a more expensive arrangement. Further, with such mechanical arrangements, it is difficult to add ~:
functions to the apparatus and accordingly, only minimum requi-site functîons are provided.
~.~
~17~i7 Further, in many instances 7 it is desirable to manually control the speed and direction of movement of the tape. Accordingly,a s~called 'tjoy-~tick" rontrol knob or lever has been provided for controlling the speed and direction of movement of the tape in dependence on the movement of the control knob. For example, in U.S. Patent No. 4,161,001, which issued on July 10, 1979 and which has a common assignee herewith, the speed and direction of movement of the tape is controlled in accordance with the rotational speed and direction of a manually actuable control knob. On the other hand, in U.S.
Patent No. 4,139,872, which issued on February 13, 1979 and which also has a common assignee herewith, the speed and dir-ection of the tape is controlled in dependence on the angular extent and direction of a manually actuable control knob from a neutral position at which movement of ~he tape is halted.
A VTR provided with the foregoing so-called "joy stick" control may be used for arbitrarily selecting a particular track on a tape at which a reproducing operation is to be commenced, or example, as during editing of the tape.
It should be appreciated that the manually actuable control knobs in the aforementioned VTRs operate in a different manner from each other. In particular, in the lat~er U.S. Patent No. 4,139,872, continuous movement of the tape at a desired speed can be controlled without the necessity of the operator contin-uously rotating the manually aceuable control knob. However, with such arrangement, it becomes difficult to accurately stop the tape with a selected track precisely positioned for scanning by tl~e rotary magnetic heads since, to do so, requires repeated to and fro displacements of the control knob. The former U.S.
Patent No. 4,161,001, which controls the speed and direction of movement of the tape in accordance with the speed and direction ~ ~ 7 ~
of rotatiol~ of the control knob, cure5 this deficiency.
However, as to the former operation, ~hat is, for controlling movement of the tape continuously at a desired speed, the con-trol knob must be manually rotated at a constant speed which, of course, becomes extremely difficult, if not impossible. It is therefore desirable to provide a control knob which combines both of the above operations into a single mechanism.
OBJECTS AND SUMMARY OF THE INVENTION
Accordingly, it is an ob]ect of this invention to provide a device for selecting the mode of operation in a video signal reproducing apparatus that avoids the above-described difficulties encountered with the prior art.
More particularly, it is an object of this invention to provide a mode selecting device which is relatively easy to operate and provides accurate control in the selected modes of operation.
It is another object of this invention to provide a mode selecting device which is adapted to operate in a "jog mode" and a "shuttle mode" for perforr,ling a track searching operation.
It is s~ill another object of this invention to pro-vide a mode selecting device for controlling the speed and direction of movement of a magnetic tape in both a "jog mode"
and a "shuttle mode" and which is adapted to chan~e over be~ween such modes merely by depression of a control knob.
In accordance with an aspect of this invention, a device for selecting the mode of operation in an apparatus for reproducing information signals recorded on a record medium during movemen~ of the lat~er, includes rotation means adapted ~o rotate abou~ an aY~is;
~17~;7 rotation detectin~ means for detecting the rotational speed and the an~ular position of the rotation means about the axis;and latch means for ~aintaining ~he rotation means in either a first or second axial position along the axis, the speed of movement of the rec~rd medi~m bein~ con~rolled in response to the detection of the angular position when the rotation means is maintained in the first axial position and the speed of movement of ~he record medium bein~ controlled in res~onse to the detection of the rotational speed when the rotation means is maintained in the second axial position.
The above, and other, objects, eatures and advanta~es of the present invention, will be apParent in the following detailed descrintion of an illustrative embodiment which is to be read in connection with the accompanving drawin~s.
BRIEF DESCRIPTIOM OF THE DRAWINGS
Figs. lA-lD are exploded perspective views of portions of the mode selectinR device of Fi~. 9;
Fig. 2 is an exDloded perspective view of a latch mechanism that îs used in that ~ortion of the mode selecting device shown in Fi~, lB;
Fig. 3 is a bottom plan view of a ~uide sleeve of an u~per holder that is used in that ~ortion of the mode selectin~
device shown in Fi~. lA
Fi~. 4 is a cross-sectional view vf an upper holder that is used in that ~ortion of ~he mode selecting device shown in Fig. lA, taken along lines A-A thereof;
Fi~, 5 is a bottom plan view of a friction member that is used in that portion of the mode selecting device shown in Fig. lBj ~L7~ 7 Fig. 6 is a cross-secti~nal view of the mode select-ing device of Fig. 9, ~c~ken along llne B-B thereof, and ~llustrated in the shuttle mode poBition;
Fig. 7 is a cross-~ec~ional ~i~w of the mode selecting device of F~g. 6, illustrated in the mode ~hanRing position;
Fi~. 8 is a cross-sectional vi~w ~f the mode selecting device of Fi~. 6, illustrated in ehe 3~R-mode pDsition; ~nd ~ ig. 9 is a perspective view of a mode selectinR
device accordin~, to one embodiment of this invention.
DETAILED DESCRIPTION OF A PREFER~ED E~ODIMENT
Referrin~ now to the drawings, and initially to Figs . lA- lD and 9 thereof, ~here is shown a mode selecting device having particular utility in a video ~i~nal reproducin~
a~paratus ~TR) of the helical ~can ty~e which is ada~ted ~o reproduce signals recorded on a magnetic tape durin~ n~ vement of the latter. In particular, the mode ~electing device accord-in~ to this invention is intended as an im~roverrent over the manuallv actuable con~crol knob assemblies ~hawn in U . 5 . Patents Nos . 4,139, 872 ~nd 4,161,901, ~ssued Februarv 13, 1979 and July 10, 1979, respectively, both having a colT~on assi~nee herewith. As shown in the drawings, the mode selecting device according to ehis inventic>n includes upper and lower fra~re n~ers 1 and 2 for mountin~ ~he device t~ a videc) si~nal reproducin~, apparatus ~nc~t ~hown). The device fur~her com-prises a re~tatable control shaft 3 having a manually actuable control lcnob 6 coaxially fixed to the ul~per end thereof, with conerol shaft 3 bein~ rotatabl~l and axially movable within upPer ~nd low4r h~lders 4 and 5 which are ~ecured ~co frame members 1 ~nd 2, ~espectively. A m~re detailed discussion of ~ 1 7 ~ ~ ~ 7 the above and other elements of the mode selecting device according to the present invention w;ll now be discussed.
Referring first to Figs. lD, 2 and 6, a latch mech-anism 11 including a selection member 9 and a ~uide member 10 is mounted on control shaft 3 between three E-rin~s 7, 8_ and 8b, the lat~er being fixedly mounted on control shaft 3.
Selection ~ember 9 is axially and rotatably movable on control shaft 3, while guide member 10 is only rotatably movable with respect to control shaft 3. As shown more particularly in Fig. 2, guide member l~ includes a cylindrical hub lOb rotatably mounted on control shaft 3 and having a plurality of, for exa~ple, ei~ht, radially extendinR arms 14 which are equallv spaced apart along the outer circumferential surface of hub lOb and which extend axially along the height of hub lOb. In this manner, notches lOa are formed at the lower end of hub lOb between arms 14. The lower end of each arm 14, in the longitudinal or hei~htwise direction thereof, includes a V-shaped claw 14c for~ed of taDered surfaces 14a and 14b which converRe fro~ op~osite sides of each arm 14 at an apProxi~ately 45 angle. In like manner, selection member 9 is formed of a cylindrical hub 9a which is rotatabl~y and axially movable along control shaft 3 and includes four radially extending arms 15 which are spaced aPart along the outer circumferential surface of hub 9a by 90, with arms 15 extendin~
outwardly in the radial direction to a lar~er extent than arms 14.
The upper end of each arm 15 is formed with a taDered surface 15a ~hich is inclined a~ an approximately 45 angle in a predetermined direction with the direction of inclination of each of surfaces 15a being identical. Selection me~lber 9 is biased toward up~er E-ring 7 by a return spring 13 situated between lower E ring ~b and selection member 9.
1 ~ 7 ~ ~ ~7 The present invention includes an L-shaped guide plate 16 integrally formed on the outer circumferential surface of hub lOb in place of one of arms 14 and includes a claw (not sho~) which is substantially identical ~o claws 14c of arms 14 and functions in an identical manner. Guide plate 16 extends from ~uide member 10 through a vertical guide slit 18 formed in upper holder 4, as shown in Fig. lA, whereby guide member 10 is prevented from rotating although, it should be appreciated, control shaft 3 is still rotatable within guide member 10. In this manner, the axial position of a tab 16a at ~he free end of guide plate 16 which extends from slit 18 can be detected for determining the mode of operation of the device. Further, the axial movement of guide member 10, and thereby control shaft 3, in the u~ward direction, as viewed in Fi~. 6, is limited by guide plate 16 which abuts against the upper end of guide slit 18.
As shown in Figs. lA and 6-8, upper holder 4 is integrally formed with a cylindrical, u~standing guide sleeve 20 in which the aforementioned guide slit 18 is formed, and has a shaft guide aperture 19 at its upper end through which the upPer end of control shaft 3 is inserte~. In ~his manner, when control shaft 3 is inserted through ~perture 19, control knob 6 is fixedly secured there~o so as to con~rol the rotatable and axial movement of control shaft 3. ~s shown more ~articularly in Figs. 3, 4 and ~-8, the inner circumferential surface of guide sl2eve 20 includes four equally spaced, deep axial grooves 21 and four equally s~aced, shallow axial grooves 22 situated between the dee~ grooves 21. In other words, grooves ~1 and 22 are all equally spaced about the inner circumferential surface of Ruide sleeve 20 with the deP~ ~rooves 21 and shallow grooves 22 being arranged a~jacent one another in an alternatin~ manner. The lower ends o the ~uides 23 seParat~ng adjacent ones of grooves ~ ~ 7 ~ ~ ~7 21 and 22 are formQd with tapered surfaces 23a which are inclined in the same direction, as sh~wn in Fi~. 4, and which extend into ~he shallow grooves 22 to for~ limit surfaces 22a therein.
In this manner, shallow gr~oves 22 are formed with a lesser axial dimension than deep grooves 21. The limit surfaces 22a, h~wever, have a radial dimension less than guides 23 so that movement of arms 15 in the upward, vertical or axial direction in shallow grooves 22 is limited, while the shorter arms 14, which have a radial dimension less than that necessary ~o contact limit surfaces 22a, are not so li~ited. .
Radial arms 14 of guide member 10 are positioned within grooves 21 and 22 so as to ~ove verticallv or axially therein, as shown in Figs. 6-8. Thus, when control shaft 3 is in the position shown in Fig. 6, a compression sprin~ 47 at the lower end thereof, as will be discussed hereinafter, biases control shaft 3 upwardly, whereby arms lS are maintained in shallow ~rooves 22. Depression o~ control knob 6 causes control shaft 3 to be ~oved in the downward axial direction, as viewed in Fi~. 7. As a result, arms 14 of guide member 10 are ~oved with control shaft 3 so that claws 14c thereof bias arms lS out of shallow ~rooves 22. Since selection member 9 is biased by return sprin~ 13, and because of the incliniations of the surfaces which form claws 14c and the tapered surfaces 15a of radial arms 15, ar~s 15 are caused to ro~ate sli~htlv so that taoered surfaces 15a are positioned in opoosin~ rela~ion to tapered surfAces 23a of F,uides 23. Thereafter, upon release of control knob 6, coil sprin~ 47 biases control shaft 3 upwardly, as viewed in Fi~. 8. Because of t'ne relative inclinations between ~aPered surfaces 15a and 23a, arms 15 are biased bv coil spring 47 into deep grooves 21. Acc~rdin~lv, upon each de~ression and release of control kno~ 6, radial arms 15 _ 8 --7~ 7 are alternately positioned in the dee~ and shallow ~rooves 21 and 22 to thereby maintain contr~l shaft 3 in first and second axial positions, A drive gear 26 havin~ radiallv extending drive teeth 26a at its outer circumferential ~urface is coaxially secured to the lower portion of control shaft 3 below the aforementioned latch mechanism 11. A circular friction plate 28 having a shutter plate 27 extending radially from the ou~er cireumference thereof is rotatablv and axially mounted alon~
control shaft 3 between E-ring 8b and drive gear 26, and is limited in its rotational movement by a pair of stoPs 33a and 33b extending from the lowèr surface of upper holder 4 and against which shutter plate 27 abuts during rotational movement of friction plate 28, as shown in Fig. 5. An annular brake shoe 29 is adhered to the upper surface of friction plate 28 and is adapted to frictionally engage a brake disk 4a formed at the lower surface of u~per holder 4, when brake shoe 29 is biased into engagement therewith, that is, when compression ~pring 47 biases control shaft 3 in the upward, axial direction into the first axial position, as viewed in Fig. 6. Further, a ~air of cam surfaces 30a and 30b are eccentrically formed on the lo~er ~urface of friction plate 28 and converge at a center or navel groove 31. In addition, a clutch ring 32 is formed at a central portion on the lower surface of friction plate 28 between cam surfaces 30a and 30b and includes clutch teeth 32a formed at the inner circumferential surface thereof, which teeth are adaPted to engage with drive teeth 26a of drive ~ear 26. As sho~n in Fig. lC, the upper frame member 1 onto which up~er holder 4 is mounted, includes a guide aperture 34 throu~,h which drive gear 26 is adapted to axially move durin~ axial movement of _ 9 _ 1 1'71 ~ 6~
control shaft 3 to which it is mounted. In this manner, drive gear 26 is ada~ted to be positioned into and out of meshing en~agement with clutch rin~ 32 durin~ axial mo~ement o control shaft 3 in the first and second axial positions, respectively.
Thus, when drive ~ear 26 is engaged with clutch ring 32 when control shaft 3 is maintained in its first axial position, rotation of cont~ol shaft 3 to a desired angular position will be maintained as a result of the frictional enga~ement of brake shoe 29 with brake disk 4a.
Further, a bias arm 36 is pivotally mounted by a pivot pin 35 to the upper surface of upper frame member l and includes a roller 37 at the free end thereof. As shown in Fig. lC, bias arm 36 is normally biased by an expansion spring 38 in the direction of arrow A so that roller 37 is aiways biased into enRagement with one of cam surfaces 30a and 30b or with navel groove 31. Thus, when braXe shoe 29 is positioned out of frictional engagement with ~rake disc 4a so that friction plate 28 is ada~ted to freely rotate about control shaft 3, that is, when control shaft 3 is maintained in its second axial position, the biasing force of roller 37 on cam surfaces 30a and 30b causes friction plate 28 to be rotated to a neutral or center ~osition in which roller 37 is enga~,ed in navel groove 31.
An annular Photo-disk 40 is posi~ioned coaxially with control shaft 3 between up~er frame member l and lower frame member 2, as shown in FiRs. 6-8. The periphery of disk 40, as shown in Fi~. lC, is formed with spaced apart cutouts definin~, for example, twenty-four radially directed light shieldinv portions 4~a between ~he successive cu~ou~s. As will be herein-after discussed, two an~ularly spaced apart photo-couplers 55 and 56 are associated with photo-disk 40 so as ~o constitute 7 ~
first and second pulse generators providing first and second pulse signals of different phases, with the phase relation of such first and second pulse si~nals being dependent on the direction of rotation of shaft 3 and control knob 6. Photo-disk 40 includes a central aperture 44 having internal ~ear teeth 45 adapted to engage with the teeth 26a of drive ~ear 26.
Surrounding aperture 44 and oll opposing surfaces of photo-dis~
40 are cylindrical coll.ars 41 and 42, with upper collar 41 being positioned for rotatable movement within aperture 34 of upper frame member l and lower collar 42 being positioned for rotatable movement within an aperture 43 of lower frame member 2.
The aforementioned lower holder 5 is secured to the lower surfaee of lower frame member 2 by means of three set screws 46. Lower holder 5 is formed at its upper surface with a circular depression which forms an outer disk hold groove 49 for rotatably supporting the lower end of collar 42 of photo-disk 40 therein. An inner spring hold groove 49a is also formed in the depression and provides a fixed surface against which one end of a compression spring 47 is positioned, the other end of the compression spring extending through aperture 43 of lower frame member 2 into biasing engagement with a groove 26b formed in drive gear 26. In this manner, compression spring 47 normally biases drive gear 26, and thereby con~rol shaft 3, in the upward, axial direction, as viewed in Fig. 6. A guide sleeve 48 is cen-trally formed within spring hold groove 49a and includes a c~ntral bore 48a through which control shaft 3 is adapted to be positioned for rotational and axial movement ~herein. Disk hold ~roove 49, spring hold groove 49a and guide sleeve 48 are all formed coaxially with aperture 43 of lower frame member 2 and with control shaft 3.
_11 ~L7~
It should be appreciated that the mode selectin~
device accordin~ to this invention is constructed in the order shown in Figs. lA-lD, which illustrates the mode selecting device of Fig. 9 blown apart. In particular, control shaft 3, having the assembly of Fig. lB thereon, is inserted throu~,h aperture 19 of uP~er holder 4, and control knob 6 is then secured thereto.
Upper frame member 1 is then ~ositioned in ali~nment with UPper holder 4, and photo-disk 40 and compression sprin~, 47 are positioned over control shaft 3 and throu~h aperture 34 of uPper frame ~ember 1. Lower frame member 2, with lawer holder 5 secured thereto, is then positioned over compression sprin~ 47 and ~hoto-disk 40, as previously discussed, wherein upper holder 4, uPper frame member 1 and lower frame member 2 are then secured to one another bv set screws 51. With this arran~ement, control shaft 3 i9 axiallv and rotatably mounted within the device. In Particular, control shaft 3 is rotatably and axially mounted at its u~per end throu~h aper~ure 19 of upper holder 4 and at its lower end throu~h ~uide sleeve 48 of lower holder 5.
In a Preferred embodiment of this inven~ion, four photo-couplers 53, 56, 55 and 56 are provi~ed, each of which mav include a light emittin~ element and a light receiving element ~ositioned opposite to one another with a space ~herebetween.
In ~articular, photo-coupler 53 functions as a mode ~etector for detecting the axial DoSition of tab 16a to determine whether control shaft 3 is in its first or second axial position. Photo-coupler 54 functions as a position detector for detecting whether shutter plate 27 is at its center rotational or neutral position. This occurs, of course, when roller 37 is positioned within navel groove 31, so that shutter ~late 27 is cen~rally Positioned between ~L~71~7 stops 33a and 33b. Photo-couplers 55 and 56 function as rotation detectors, each of which includes a light emittin~
element for directing a li~ht beam across the ~eriPheral ~ortion of pho~disk 40 ~o a respective light receiving element at the opposite side of the plane of rotation. Thus, when disk 40 is rotated wi~h rotstion of control knob 6, the light emitted rom each light emitting element toward the respecti~e li,~ht receiving element is intermittently blocked by successive light shielding portions 40a of disk 40 with the result that each of photo-couplers 55 and 56 provides alternating signals or pulses. ?
Furthermore, the angular spacin~ between photo-couplers 55 And 56 is selected so that the alternating si~nals or pulses derived therefrom, uPOn turning of control ~cnob 6, will have a phase difference of 90 therebetween. In this manner, ~hoto-couplers 55 and 56 are able to detect the rota~ional direction, sneed and angular extent of control shaft 3 in response to the rotation of photo-disk 40.
In operation, the mode selecting device accordin~ to present invention is designed to control o~eration of a video signal reproducing apparatus in a jog mode or a shuttle mode to effect a track selecting operation. The shuttle mode of o~era-tion corresponds to the operation in the aforementioned commonly assigned U.S. Patent No. 4,139,872 in which the speed and direction of transport of the magnetic tape is de~ermined in accordance with the an~ular exten~ and direction of rotation of control knob 6. On the other hand, the jR mQde Of o~eration corresponds to the operation of the aforementioned commonly assi~ned U.S. Patent No. 4,161,001 in which the speed and dir-ection of movement of the tape is varied in accordance with the s~eed and direction of rotation of control knob 6. It should be ~ 7 appreciated that with either of such modes of operation, a mode selectin~ mechanism (not shown) of the VTR must be actuated ~o disen~age the normal control functions and permit the mode selecting device accordin~ to ~his invention to control the transp~rt of the ~ape.
A description of the shuttle mode of opera~ion with the present invention will now be described. Beore the shuttle mode is selected, however, the mode selecting device is operating in its jog mode of operation in which brake shoe 29 is out of frictional engagement with brake disk 4a. This means that friction plate 28 is free to rotate and thereby, roller 37, by means of its cam action with cam surfaces 30a and 30b, is positioned within navel groove 31 so that control shaft 3 and shutter plate 27 are maintained in the center rotational or neutral position.
Upon depression of control knob 6, control shaft 3 and ~uide member 10 secured thereto move downwardly in the v~rtical or axial direction, as viewed in Fig. 6, against the action of compression sPrin~ 47, to bias radial arms 15 of selection member 9 out of shallow ~rooves 22. However, as aforementioned, because of the inclinations of the surfaces 14a and 14b which orm cl~ws 14c and the inclination of tapered surfaces 15a of radial arms 15, the orce sf return spring 13 in biasing tapered surfaces 15a into en~agement with cl~ws 14c causes arms 15 ~o rotate so as to be positioned in notches lOa of ~uide me~ber 10 and in op~osing relation to tapered surfaces 23a of guide 23. When the depression force on control knob 6 is released, compression sPrin~ 47 biases drive ~ear 26, and thereby, control shaft 3 in the upward, axial direction. Because of the relative inclinations between ta~ered surfaces 15a and 23a, r~dial arms 15 are rotated and then biased into deep ~rooves 21 of guide sleeve 20.
1 ~ 7 ~ 7 Since the vertical extent within which cont~ol shaft 3 is adapted to move is now increased, dirve gear 26 is biased upwardly into meshing engagement wi~h clu~ch ring 32 and, in particular, clutch teeth 32a thereof, whereby rotation of control knob 6 results in a consequent ro~ation of friction plate 28.
At the same time, compression spring 47, through drive gear 26, biases friction plate 28 upwardly, as viewed in Fig. 6, whereupon brake shoe 29 frictionally enga~es wi~h brake disk 4a of upper holder 4. It should be apprecia~ed, that because of sueh frictional engagement, control knob 6 can not be freely rotated at a substantially constant speed by impartin~ an initial rotational force. Further, drive gear 26 is also positioned in meshing enga~ement with teeth 45 of photo-disk 40, as shown in Fig. 6.
Also, in the shuttle mode of operation, tab 16a of guide ~late 16 is displaced upwardly, as viewed in Fi~. 6, from between the light emitting element and light receiving element of mode detector 53. In this manner, mode detector 53 ~roduces a si~nal for actuating a circuit of the ~ideo si~nal reproducing apparatus corresponding to the shuttle mode of operation.
Further, as previously discussed, at the beginning of the shuttle mode of operation, roller 37 is positioned within navel groove 31, whereby friction plate 28 is arran~ed in a center rotational or neutral position, as shown by solid lines in Fig. 5. I~ should be appreciated that, at this ~osition, .
shutter plate 27 is Positioned between the light emittin~, element and light receiving element of center position de~ec~or 54 and this latter detector produces a si~nal corresponding to the still motion mode of the VTR, whereby no movement of the ~a~e results. However, during rotation of control knob 6, roller 37 is biased into contact with one of cam surfaces 30a or 30b of friction plate 28 and, because of the frictional engagement of brake shoe 29 and brake disk 42, the angular extent of rotativn vf control knob 6 is maintained at a desired position, for exam~le, as shown by the dot-dash lin in Fi~:. 5. It is to be remembered, however, that the angular extent of rotation of fric~ion plate 28 is limited by stops 33a and 33b. In any event, in this mode of operation, rotation of control knob 6 causes friction plate ~8 and photo-disk 40 to rotate to~ether by means of drive gear 26.
During rotation of control knob 6, shutter plate 27 is displaced from position detector 54 and thereby, the latter no longer controls the video si~nal reproducing apparatus to operate in its still mode of operation. Further, as previously discussed, rotation of control knob 6 causes photo-disk 4Q to correspondingly rotate. Accordinglv, rotation detectors 55 and 56 detect the direction and an~ular extent of rotation of control knob 6 and in accordance therewith, control the direction and speed of movement of the ma~netic ta~e. In particular, when friction plate 28 is rotated in the direction of arrow B in Fi~. 5, the light shielding portions 40a of photo-disk 40 are rotated in the same direction, whereuPon rotation detectors 55 and S6, in turnj cause the tape to be trans~orted in the forward (~J~) direction in the VTR. As the control knob 6 is further rotated, the number of light shieldin~ portions 40a of disk 40 which cross the ~ath between the light emittin~ ele~ent and the li~ht receivin~, element of rotation detector 55, is detected and the speed of movement of the ma~,netic tape is increased in propor~ion to such detected number. tJhen friction plate 28 is caused to rotate in the opposite direction of arrow C of Fi~. 5, the ma~netic tape is transported in the reverse direction in response to the output from rotation detectors 55 and 56 and the sPeed of movement 7 ~
of the tape is controlled in the same manner as discussed above. In this manner, in the shu~tle mode of operation, manual rotation of control knob 6 con~rols the direction and speed of movement of the magnetic tape ~o any desired value As a result, particular video inormation recorded on the tape can be located in a short period of time.
The jog mode of operation, which mode is similar to that described in U.S. Patent No. 4,161,00, in which the speed and direction of the magnetic tape is varied in accordance with the speed and direction of rotation of the contr~l knob, will now be discussed. To chan~e to this mode of operation, control knob 6, and therebv control shaft 3, are dePressed downwardlv, as viewed in Fig. 7. As a result, ~uide me~ber 10, which is axially fixed to control shaft 3, is also displaced in the same direc~ion so as ~o bias radial arm~ 15 of selection member 9 out of deep grooves 21, against the action of compression spring 47. Since selection member 9 is biased into en~a~ement with guide member 10 by return spring 13, and because of the relative inclinations of tapered surfaces 15a of radial arms 15, and surfaces 14a and 14b which form cla~s 14c,when control knob 6 is fully depressed, claws 14c of guide member 10 cause selection member 9 to rotate about control shaft 3 so that radial arms 15 are positioned in notches lOa of guide member 10 and in o~osin~
relation to tapered surfaces 23a of guides 23. Thereafter, u~on relcase o~ the depression force on control knob 6, co~ression s~ring 47 biases drive ~ear 26, and thereby corltrol shaft 3, upwardly, as viewed in Fi~. 8. Because of the relative inclina-tions between tapered surfaces 15a and 23a, selection member 9 is rotated in a predeter~ined direction so that radial arms 15 are biased into shallow grooves 22 o upper holder 4, in which the free ends of radial arms 1~ ale engaged with limiting surfaces 22a. In this rnanner, control shaft 3 is maintained in the second 11'7~67 axial posi~ion shown in FiF,. 8.
In this latter axial position, drive member 26 is positic~ned out of meshing enga~ement with teeth 32a of clutch rign 32. Accordingly, brake shoe 29 is no lon~er frictionally enga~ed with brake disk 4a of upper holder 4, whereupon friction plate 28 is free to rotate about control shaft 3. In this manner, because of the cam action between roller 37 and cam surfaces 30a and 30b, friction plate 28 is caused to rotate ~o its neutral or center ro~ational position in which roller 37 is positioned within navel groove 31. At this time, shutter plate 27 is in its neutral position between the light emitting element and li~ht receivin~ element of detec~or 54, as shown in Fi,~. 5. It is to be appreciated, however, that in the second axial position shown in Fig. 8, the teeth 26a of drive ~ear 26 are maintained in meshing engagement with teeth 45 of disk 40. Since drive gear 26 is only en~aRed with photo-disk 40, the latter disk is free to rotate in either direction ~ithout an~ limits in the an~ular extent of rotation and without any braking force bein~ applied.
As control knob 6 is rotated, the direction of rotation thereof is detected by rotation detectors 55 and 56, as previously discussed. At the sa~e time, the speed of rotation of control knob is de~ected by rotation detector 55 which detects the number of light shieldin~ portions 40a passin~ therethrou~,h.
As a result, the magnetic tape is transported in either a forward or reverse direction and at a speed correspondin~ to the rotational speed of control knob 6. However, when rotation of control knob 6 is halted, position de~ector 54 causes the VTR to operate in its still mode.
-It should be appreciated that each depression of control knob 6 results in the mode selecting device according to this invention passing through the condition shown in Fig. 7 and alternately returning to the positions shown in Figs. 6 and 8. In this manner, continual depressions of control knob 6 cause the mGde selecting device accordin~ to this invention to alternate between the jog mode and the shuttle mode of oPeration .
Havin~ descri~ed a specific preferred embodiment of this invention with reference to the acc~mpanyinp, drawin~s, it is to be understood that the invention is no~ limited to that precise embodiment, and that various changes and modifications may be effected therein by one skilled in the art without dePartinp, from the scoPe or s~irit of the invention as de~ined in the appended claims.
~,9
.
Field of The Invention This invention relates generally to video signal reproducing apparatus and, more particularly, is directed to a device for selecting the mode of operation in a video signal reproducing apparatus.
Description of the Prior_ ~ hen an existing magnetic video tape recorder (VTR) of the helical scan type is o~erated in its reproducing or playback mode with a time base corrector, the speed at which the tape is transported or moved longitudinally between the supply and take-up reels may be varied while the rotary magnetic heads are rotated at the frame frequency so as to provide, on a monitor, a still, slow-motion or fast-motion reproduced picture in dependence on the speed of movement of the tape. Known VTRs have conventionally utilized electric circuits including, for example, an electro-magnetic clutch or a plunger-type solenoid, for selecting the above modes of operation, in addition to the rewind mode. Although such arrangements are relatively simple in construction, the electric circuits utilized therein are relatively expensive. It has also been proposed to utilize mechanical mode selector~ for selecting predetermined modes of operation. However, such latter selectors are inferior in operation ~o the aforementioned electric circuits and tend to be of a relatively large si~e, thereby occupying excessive space and resulting in a more expensive arrangement. Further, with such mechanical arrangements, it is difficult to add ~:
functions to the apparatus and accordingly, only minimum requi-site functîons are provided.
~.~
~17~i7 Further, in many instances 7 it is desirable to manually control the speed and direction of movement of the tape. Accordingly,a s~called 'tjoy-~tick" rontrol knob or lever has been provided for controlling the speed and direction of movement of the tape in dependence on the movement of the control knob. For example, in U.S. Patent No. 4,161,001, which issued on July 10, 1979 and which has a common assignee herewith, the speed and direction of movement of the tape is controlled in accordance with the rotational speed and direction of a manually actuable control knob. On the other hand, in U.S.
Patent No. 4,139,872, which issued on February 13, 1979 and which also has a common assignee herewith, the speed and dir-ection of the tape is controlled in dependence on the angular extent and direction of a manually actuable control knob from a neutral position at which movement of ~he tape is halted.
A VTR provided with the foregoing so-called "joy stick" control may be used for arbitrarily selecting a particular track on a tape at which a reproducing operation is to be commenced, or example, as during editing of the tape.
It should be appreciated that the manually actuable control knobs in the aforementioned VTRs operate in a different manner from each other. In particular, in the lat~er U.S. Patent No. 4,139,872, continuous movement of the tape at a desired speed can be controlled without the necessity of the operator contin-uously rotating the manually aceuable control knob. However, with such arrangement, it becomes difficult to accurately stop the tape with a selected track precisely positioned for scanning by tl~e rotary magnetic heads since, to do so, requires repeated to and fro displacements of the control knob. The former U.S.
Patent No. 4,161,001, which controls the speed and direction of movement of the tape in accordance with the speed and direction ~ ~ 7 ~
of rotatiol~ of the control knob, cure5 this deficiency.
However, as to the former operation, ~hat is, for controlling movement of the tape continuously at a desired speed, the con-trol knob must be manually rotated at a constant speed which, of course, becomes extremely difficult, if not impossible. It is therefore desirable to provide a control knob which combines both of the above operations into a single mechanism.
OBJECTS AND SUMMARY OF THE INVENTION
Accordingly, it is an ob]ect of this invention to provide a device for selecting the mode of operation in a video signal reproducing apparatus that avoids the above-described difficulties encountered with the prior art.
More particularly, it is an object of this invention to provide a mode selecting device which is relatively easy to operate and provides accurate control in the selected modes of operation.
It is another object of this invention to provide a mode selecting device which is adapted to operate in a "jog mode" and a "shuttle mode" for perforr,ling a track searching operation.
It is s~ill another object of this invention to pro-vide a mode selecting device for controlling the speed and direction of movement of a magnetic tape in both a "jog mode"
and a "shuttle mode" and which is adapted to chan~e over be~ween such modes merely by depression of a control knob.
In accordance with an aspect of this invention, a device for selecting the mode of operation in an apparatus for reproducing information signals recorded on a record medium during movemen~ of the lat~er, includes rotation means adapted ~o rotate abou~ an aY~is;
~17~;7 rotation detectin~ means for detecting the rotational speed and the an~ular position of the rotation means about the axis;and latch means for ~aintaining ~he rotation means in either a first or second axial position along the axis, the speed of movement of the rec~rd medi~m bein~ con~rolled in response to the detection of the angular position when the rotation means is maintained in the first axial position and the speed of movement of ~he record medium bein~ controlled in res~onse to the detection of the rotational speed when the rotation means is maintained in the second axial position.
The above, and other, objects, eatures and advanta~es of the present invention, will be apParent in the following detailed descrintion of an illustrative embodiment which is to be read in connection with the accompanving drawin~s.
BRIEF DESCRIPTIOM OF THE DRAWINGS
Figs. lA-lD are exploded perspective views of portions of the mode selectinR device of Fi~. 9;
Fig. 2 is an exDloded perspective view of a latch mechanism that îs used in that ~ortion of the mode selecting device shown in Fi~, lB;
Fig. 3 is a bottom plan view of a ~uide sleeve of an u~per holder that is used in that ~ortion of the mode selectin~
device shown in Fi~. lA
Fi~. 4 is a cross-sectional view vf an upper holder that is used in that ~ortion of ~he mode selecting device shown in Fig. lA, taken along lines A-A thereof;
Fi~, 5 is a bottom plan view of a friction member that is used in that portion of the mode selecting device shown in Fig. lBj ~L7~ 7 Fig. 6 is a cross-secti~nal view of the mode select-ing device of Fig. 9, ~c~ken along llne B-B thereof, and ~llustrated in the shuttle mode poBition;
Fig. 7 is a cross-~ec~ional ~i~w of the mode selecting device of F~g. 6, illustrated in the mode ~hanRing position;
Fi~. 8 is a cross-sectional vi~w ~f the mode selecting device of Fi~. 6, illustrated in ehe 3~R-mode pDsition; ~nd ~ ig. 9 is a perspective view of a mode selectinR
device accordin~, to one embodiment of this invention.
DETAILED DESCRIPTION OF A PREFER~ED E~ODIMENT
Referrin~ now to the drawings, and initially to Figs . lA- lD and 9 thereof, ~here is shown a mode selecting device having particular utility in a video ~i~nal reproducin~
a~paratus ~TR) of the helical ~can ty~e which is ada~ted ~o reproduce signals recorded on a magnetic tape durin~ n~ vement of the latter. In particular, the mode ~electing device accord-in~ to this invention is intended as an im~roverrent over the manuallv actuable con~crol knob assemblies ~hawn in U . 5 . Patents Nos . 4,139, 872 ~nd 4,161,901, ~ssued Februarv 13, 1979 and July 10, 1979, respectively, both having a colT~on assi~nee herewith. As shown in the drawings, the mode selecting device according to ehis inventic>n includes upper and lower fra~re n~ers 1 and 2 for mountin~ ~he device t~ a videc) si~nal reproducin~, apparatus ~nc~t ~hown). The device fur~her com-prises a re~tatable control shaft 3 having a manually actuable control lcnob 6 coaxially fixed to the ul~per end thereof, with conerol shaft 3 bein~ rotatabl~l and axially movable within upPer ~nd low4r h~lders 4 and 5 which are ~ecured ~co frame members 1 ~nd 2, ~espectively. A m~re detailed discussion of ~ 1 7 ~ ~ ~ 7 the above and other elements of the mode selecting device according to the present invention w;ll now be discussed.
Referring first to Figs. lD, 2 and 6, a latch mech-anism 11 including a selection member 9 and a ~uide member 10 is mounted on control shaft 3 between three E-rin~s 7, 8_ and 8b, the lat~er being fixedly mounted on control shaft 3.
Selection ~ember 9 is axially and rotatably movable on control shaft 3, while guide member 10 is only rotatably movable with respect to control shaft 3. As shown more particularly in Fig. 2, guide member l~ includes a cylindrical hub lOb rotatably mounted on control shaft 3 and having a plurality of, for exa~ple, ei~ht, radially extendinR arms 14 which are equallv spaced apart along the outer circumferential surface of hub lOb and which extend axially along the height of hub lOb. In this manner, notches lOa are formed at the lower end of hub lOb between arms 14. The lower end of each arm 14, in the longitudinal or hei~htwise direction thereof, includes a V-shaped claw 14c for~ed of taDered surfaces 14a and 14b which converRe fro~ op~osite sides of each arm 14 at an apProxi~ately 45 angle. In like manner, selection member 9 is formed of a cylindrical hub 9a which is rotatabl~y and axially movable along control shaft 3 and includes four radially extending arms 15 which are spaced aPart along the outer circumferential surface of hub 9a by 90, with arms 15 extendin~
outwardly in the radial direction to a lar~er extent than arms 14.
The upper end of each arm 15 is formed with a taDered surface 15a ~hich is inclined a~ an approximately 45 angle in a predetermined direction with the direction of inclination of each of surfaces 15a being identical. Selection me~lber 9 is biased toward up~er E-ring 7 by a return spring 13 situated between lower E ring ~b and selection member 9.
1 ~ 7 ~ ~ ~7 The present invention includes an L-shaped guide plate 16 integrally formed on the outer circumferential surface of hub lOb in place of one of arms 14 and includes a claw (not sho~) which is substantially identical ~o claws 14c of arms 14 and functions in an identical manner. Guide plate 16 extends from ~uide member 10 through a vertical guide slit 18 formed in upper holder 4, as shown in Fig. lA, whereby guide member 10 is prevented from rotating although, it should be appreciated, control shaft 3 is still rotatable within guide member 10. In this manner, the axial position of a tab 16a at ~he free end of guide plate 16 which extends from slit 18 can be detected for determining the mode of operation of the device. Further, the axial movement of guide member 10, and thereby control shaft 3, in the u~ward direction, as viewed in Fi~. 6, is limited by guide plate 16 which abuts against the upper end of guide slit 18.
As shown in Figs. lA and 6-8, upper holder 4 is integrally formed with a cylindrical, u~standing guide sleeve 20 in which the aforementioned guide slit 18 is formed, and has a shaft guide aperture 19 at its upper end through which the upPer end of control shaft 3 is inserte~. In ~his manner, when control shaft 3 is inserted through ~perture 19, control knob 6 is fixedly secured there~o so as to con~rol the rotatable and axial movement of control shaft 3. ~s shown more ~articularly in Figs. 3, 4 and ~-8, the inner circumferential surface of guide sl2eve 20 includes four equally spaced, deep axial grooves 21 and four equally s~aced, shallow axial grooves 22 situated between the dee~ grooves 21. In other words, grooves ~1 and 22 are all equally spaced about the inner circumferential surface of Ruide sleeve 20 with the deP~ ~rooves 21 and shallow grooves 22 being arranged a~jacent one another in an alternatin~ manner. The lower ends o the ~uides 23 seParat~ng adjacent ones of grooves ~ ~ 7 ~ ~ ~7 21 and 22 are formQd with tapered surfaces 23a which are inclined in the same direction, as sh~wn in Fi~. 4, and which extend into ~he shallow grooves 22 to for~ limit surfaces 22a therein.
In this manner, shallow gr~oves 22 are formed with a lesser axial dimension than deep grooves 21. The limit surfaces 22a, h~wever, have a radial dimension less than guides 23 so that movement of arms 15 in the upward, vertical or axial direction in shallow grooves 22 is limited, while the shorter arms 14, which have a radial dimension less than that necessary ~o contact limit surfaces 22a, are not so li~ited. .
Radial arms 14 of guide member 10 are positioned within grooves 21 and 22 so as to ~ove verticallv or axially therein, as shown in Figs. 6-8. Thus, when control shaft 3 is in the position shown in Fig. 6, a compression sprin~ 47 at the lower end thereof, as will be discussed hereinafter, biases control shaft 3 upwardly, whereby arms lS are maintained in shallow ~rooves 22. Depression o~ control knob 6 causes control shaft 3 to be ~oved in the downward axial direction, as viewed in Fi~. 7. As a result, arms 14 of guide member 10 are ~oved with control shaft 3 so that claws 14c thereof bias arms lS out of shallow ~rooves 22. Since selection member 9 is biased by return sprin~ 13, and because of the incliniations of the surfaces which form claws 14c and the tapered surfaces 15a of radial arms 15, ar~s 15 are caused to ro~ate sli~htlv so that taoered surfaces 15a are positioned in opoosin~ rela~ion to tapered surfAces 23a of F,uides 23. Thereafter, upon release of control knob 6, coil sprin~ 47 biases control shaft 3 upwardly, as viewed in Fi~. 8. Because of t'ne relative inclinations between ~aPered surfaces 15a and 23a, arms 15 are biased bv coil spring 47 into deep grooves 21. Acc~rdin~lv, upon each de~ression and release of control kno~ 6, radial arms 15 _ 8 --7~ 7 are alternately positioned in the dee~ and shallow ~rooves 21 and 22 to thereby maintain contr~l shaft 3 in first and second axial positions, A drive gear 26 havin~ radiallv extending drive teeth 26a at its outer circumferential ~urface is coaxially secured to the lower portion of control shaft 3 below the aforementioned latch mechanism 11. A circular friction plate 28 having a shutter plate 27 extending radially from the ou~er cireumference thereof is rotatablv and axially mounted alon~
control shaft 3 between E-ring 8b and drive gear 26, and is limited in its rotational movement by a pair of stoPs 33a and 33b extending from the lowèr surface of upper holder 4 and against which shutter plate 27 abuts during rotational movement of friction plate 28, as shown in Fig. 5. An annular brake shoe 29 is adhered to the upper surface of friction plate 28 and is adapted to frictionally engage a brake disk 4a formed at the lower surface of u~per holder 4, when brake shoe 29 is biased into engagement therewith, that is, when compression ~pring 47 biases control shaft 3 in the upward, axial direction into the first axial position, as viewed in Fig. 6. Further, a ~air of cam surfaces 30a and 30b are eccentrically formed on the lo~er ~urface of friction plate 28 and converge at a center or navel groove 31. In addition, a clutch ring 32 is formed at a central portion on the lower surface of friction plate 28 between cam surfaces 30a and 30b and includes clutch teeth 32a formed at the inner circumferential surface thereof, which teeth are adaPted to engage with drive teeth 26a of drive ~ear 26. As sho~n in Fig. lC, the upper frame member 1 onto which up~er holder 4 is mounted, includes a guide aperture 34 throu~,h which drive gear 26 is adapted to axially move durin~ axial movement of _ 9 _ 1 1'71 ~ 6~
control shaft 3 to which it is mounted. In this manner, drive gear 26 is ada~ted to be positioned into and out of meshing en~agement with clutch rin~ 32 durin~ axial mo~ement o control shaft 3 in the first and second axial positions, respectively.
Thus, when drive ~ear 26 is engaged with clutch ring 32 when control shaft 3 is maintained in its first axial position, rotation of cont~ol shaft 3 to a desired angular position will be maintained as a result of the frictional enga~ement of brake shoe 29 with brake disk 4a.
Further, a bias arm 36 is pivotally mounted by a pivot pin 35 to the upper surface of upper frame member l and includes a roller 37 at the free end thereof. As shown in Fig. lC, bias arm 36 is normally biased by an expansion spring 38 in the direction of arrow A so that roller 37 is aiways biased into enRagement with one of cam surfaces 30a and 30b or with navel groove 31. Thus, when braXe shoe 29 is positioned out of frictional engagement with ~rake disc 4a so that friction plate 28 is ada~ted to freely rotate about control shaft 3, that is, when control shaft 3 is maintained in its second axial position, the biasing force of roller 37 on cam surfaces 30a and 30b causes friction plate 28 to be rotated to a neutral or center ~osition in which roller 37 is enga~,ed in navel groove 31.
An annular Photo-disk 40 is posi~ioned coaxially with control shaft 3 between up~er frame member l and lower frame member 2, as shown in FiRs. 6-8. The periphery of disk 40, as shown in Fi~. lC, is formed with spaced apart cutouts definin~, for example, twenty-four radially directed light shieldinv portions 4~a between ~he successive cu~ou~s. As will be herein-after discussed, two an~ularly spaced apart photo-couplers 55 and 56 are associated with photo-disk 40 so as ~o constitute 7 ~
first and second pulse generators providing first and second pulse signals of different phases, with the phase relation of such first and second pulse si~nals being dependent on the direction of rotation of shaft 3 and control knob 6. Photo-disk 40 includes a central aperture 44 having internal ~ear teeth 45 adapted to engage with the teeth 26a of drive ~ear 26.
Surrounding aperture 44 and oll opposing surfaces of photo-dis~
40 are cylindrical coll.ars 41 and 42, with upper collar 41 being positioned for rotatable movement within aperture 34 of upper frame member l and lower collar 42 being positioned for rotatable movement within an aperture 43 of lower frame member 2.
The aforementioned lower holder 5 is secured to the lower surfaee of lower frame member 2 by means of three set screws 46. Lower holder 5 is formed at its upper surface with a circular depression which forms an outer disk hold groove 49 for rotatably supporting the lower end of collar 42 of photo-disk 40 therein. An inner spring hold groove 49a is also formed in the depression and provides a fixed surface against which one end of a compression spring 47 is positioned, the other end of the compression spring extending through aperture 43 of lower frame member 2 into biasing engagement with a groove 26b formed in drive gear 26. In this manner, compression spring 47 normally biases drive gear 26, and thereby con~rol shaft 3, in the upward, axial direction, as viewed in Fig. 6. A guide sleeve 48 is cen-trally formed within spring hold groove 49a and includes a c~ntral bore 48a through which control shaft 3 is adapted to be positioned for rotational and axial movement ~herein. Disk hold ~roove 49, spring hold groove 49a and guide sleeve 48 are all formed coaxially with aperture 43 of lower frame member 2 and with control shaft 3.
_11 ~L7~
It should be appreciated that the mode selectin~
device accordin~ to this invention is constructed in the order shown in Figs. lA-lD, which illustrates the mode selecting device of Fig. 9 blown apart. In particular, control shaft 3, having the assembly of Fig. lB thereon, is inserted throu~,h aperture 19 of uP~er holder 4, and control knob 6 is then secured thereto.
Upper frame member 1 is then ~ositioned in ali~nment with UPper holder 4, and photo-disk 40 and compression sprin~, 47 are positioned over control shaft 3 and throu~h aperture 34 of uPper frame ~ember 1. Lower frame member 2, with lawer holder 5 secured thereto, is then positioned over compression sprin~ 47 and ~hoto-disk 40, as previously discussed, wherein upper holder 4, uPper frame member 1 and lower frame member 2 are then secured to one another bv set screws 51. With this arran~ement, control shaft 3 i9 axiallv and rotatably mounted within the device. In Particular, control shaft 3 is rotatably and axially mounted at its u~per end throu~h aper~ure 19 of upper holder 4 and at its lower end throu~h ~uide sleeve 48 of lower holder 5.
In a Preferred embodiment of this inven~ion, four photo-couplers 53, 56, 55 and 56 are provi~ed, each of which mav include a light emittin~ element and a light receiving element ~ositioned opposite to one another with a space ~herebetween.
In ~articular, photo-coupler 53 functions as a mode ~etector for detecting the axial DoSition of tab 16a to determine whether control shaft 3 is in its first or second axial position. Photo-coupler 54 functions as a position detector for detecting whether shutter plate 27 is at its center rotational or neutral position. This occurs, of course, when roller 37 is positioned within navel groove 31, so that shutter ~late 27 is cen~rally Positioned between ~L~71~7 stops 33a and 33b. Photo-couplers 55 and 56 function as rotation detectors, each of which includes a light emittin~
element for directing a li~ht beam across the ~eriPheral ~ortion of pho~disk 40 ~o a respective light receiving element at the opposite side of the plane of rotation. Thus, when disk 40 is rotated wi~h rotstion of control knob 6, the light emitted rom each light emitting element toward the respecti~e li,~ht receiving element is intermittently blocked by successive light shielding portions 40a of disk 40 with the result that each of photo-couplers 55 and 56 provides alternating signals or pulses. ?
Furthermore, the angular spacin~ between photo-couplers 55 And 56 is selected so that the alternating si~nals or pulses derived therefrom, uPOn turning of control ~cnob 6, will have a phase difference of 90 therebetween. In this manner, ~hoto-couplers 55 and 56 are able to detect the rota~ional direction, sneed and angular extent of control shaft 3 in response to the rotation of photo-disk 40.
In operation, the mode selecting device accordin~ to present invention is designed to control o~eration of a video signal reproducing apparatus in a jog mode or a shuttle mode to effect a track selecting operation. The shuttle mode of o~era-tion corresponds to the operation in the aforementioned commonly assigned U.S. Patent No. 4,139,872 in which the speed and direction of transport of the magnetic tape is de~ermined in accordance with the an~ular exten~ and direction of rotation of control knob 6. On the other hand, the jR mQde Of o~eration corresponds to the operation of the aforementioned commonly assi~ned U.S. Patent No. 4,161,001 in which the speed and dir-ection of movement of the tape is varied in accordance with the s~eed and direction of rotation of control knob 6. It should be ~ 7 appreciated that with either of such modes of operation, a mode selectin~ mechanism (not shown) of the VTR must be actuated ~o disen~age the normal control functions and permit the mode selecting device accordin~ to ~his invention to control the transp~rt of the ~ape.
A description of the shuttle mode of opera~ion with the present invention will now be described. Beore the shuttle mode is selected, however, the mode selecting device is operating in its jog mode of operation in which brake shoe 29 is out of frictional engagement with brake disk 4a. This means that friction plate 28 is free to rotate and thereby, roller 37, by means of its cam action with cam surfaces 30a and 30b, is positioned within navel groove 31 so that control shaft 3 and shutter plate 27 are maintained in the center rotational or neutral position.
Upon depression of control knob 6, control shaft 3 and ~uide member 10 secured thereto move downwardly in the v~rtical or axial direction, as viewed in Fig. 6, against the action of compression sPrin~ 47, to bias radial arms 15 of selection member 9 out of shallow ~rooves 22. However, as aforementioned, because of the inclinations of the surfaces 14a and 14b which orm cl~ws 14c and the inclination of tapered surfaces 15a of radial arms 15, the orce sf return spring 13 in biasing tapered surfaces 15a into en~agement with cl~ws 14c causes arms 15 ~o rotate so as to be positioned in notches lOa of ~uide me~ber 10 and in op~osing relation to tapered surfaces 23a of guide 23. When the depression force on control knob 6 is released, compression sPrin~ 47 biases drive ~ear 26, and thereby, control shaft 3 in the upward, axial direction. Because of the relative inclinations between ta~ered surfaces 15a and 23a, r~dial arms 15 are rotated and then biased into deep ~rooves 21 of guide sleeve 20.
1 ~ 7 ~ 7 Since the vertical extent within which cont~ol shaft 3 is adapted to move is now increased, dirve gear 26 is biased upwardly into meshing engagement wi~h clu~ch ring 32 and, in particular, clutch teeth 32a thereof, whereby rotation of control knob 6 results in a consequent ro~ation of friction plate 28.
At the same time, compression spring 47, through drive gear 26, biases friction plate 28 upwardly, as viewed in Fig. 6, whereupon brake shoe 29 frictionally enga~es wi~h brake disk 4a of upper holder 4. It should be apprecia~ed, that because of sueh frictional engagement, control knob 6 can not be freely rotated at a substantially constant speed by impartin~ an initial rotational force. Further, drive gear 26 is also positioned in meshing enga~ement with teeth 45 of photo-disk 40, as shown in Fig. 6.
Also, in the shuttle mode of operation, tab 16a of guide ~late 16 is displaced upwardly, as viewed in Fi~. 6, from between the light emitting element and light receiving element of mode detector 53. In this manner, mode detector 53 ~roduces a si~nal for actuating a circuit of the ~ideo si~nal reproducing apparatus corresponding to the shuttle mode of operation.
Further, as previously discussed, at the beginning of the shuttle mode of operation, roller 37 is positioned within navel groove 31, whereby friction plate 28 is arran~ed in a center rotational or neutral position, as shown by solid lines in Fig. 5. I~ should be appreciated that, at this ~osition, .
shutter plate 27 is Positioned between the light emittin~, element and light receiving element of center position de~ec~or 54 and this latter detector produces a si~nal corresponding to the still motion mode of the VTR, whereby no movement of the ~a~e results. However, during rotation of control knob 6, roller 37 is biased into contact with one of cam surfaces 30a or 30b of friction plate 28 and, because of the frictional engagement of brake shoe 29 and brake disk 42, the angular extent of rotativn vf control knob 6 is maintained at a desired position, for exam~le, as shown by the dot-dash lin in Fi~:. 5. It is to be remembered, however, that the angular extent of rotation of fric~ion plate 28 is limited by stops 33a and 33b. In any event, in this mode of operation, rotation of control knob 6 causes friction plate ~8 and photo-disk 40 to rotate to~ether by means of drive gear 26.
During rotation of control knob 6, shutter plate 27 is displaced from position detector 54 and thereby, the latter no longer controls the video si~nal reproducing apparatus to operate in its still mode of operation. Further, as previously discussed, rotation of control knob 6 causes photo-disk 4Q to correspondingly rotate. Accordinglv, rotation detectors 55 and 56 detect the direction and an~ular extent of rotation of control knob 6 and in accordance therewith, control the direction and speed of movement of the ma~netic ta~e. In particular, when friction plate 28 is rotated in the direction of arrow B in Fi~. 5, the light shielding portions 40a of photo-disk 40 are rotated in the same direction, whereuPon rotation detectors 55 and S6, in turnj cause the tape to be trans~orted in the forward (~J~) direction in the VTR. As the control knob 6 is further rotated, the number of light shieldin~ portions 40a of disk 40 which cross the ~ath between the light emittin~ ele~ent and the li~ht receivin~, element of rotation detector 55, is detected and the speed of movement of the ma~,netic tape is increased in propor~ion to such detected number. tJhen friction plate 28 is caused to rotate in the opposite direction of arrow C of Fi~. 5, the ma~netic tape is transported in the reverse direction in response to the output from rotation detectors 55 and 56 and the sPeed of movement 7 ~
of the tape is controlled in the same manner as discussed above. In this manner, in the shu~tle mode of operation, manual rotation of control knob 6 con~rols the direction and speed of movement of the magnetic tape ~o any desired value As a result, particular video inormation recorded on the tape can be located in a short period of time.
The jog mode of operation, which mode is similar to that described in U.S. Patent No. 4,161,00, in which the speed and direction of the magnetic tape is varied in accordance with the speed and direction of rotation of the contr~l knob, will now be discussed. To chan~e to this mode of operation, control knob 6, and therebv control shaft 3, are dePressed downwardlv, as viewed in Fig. 7. As a result, ~uide me~ber 10, which is axially fixed to control shaft 3, is also displaced in the same direc~ion so as ~o bias radial arm~ 15 of selection member 9 out of deep grooves 21, against the action of compression spring 47. Since selection member 9 is biased into en~a~ement with guide member 10 by return spring 13, and because of the relative inclinations of tapered surfaces 15a of radial arms 15, and surfaces 14a and 14b which form cla~s 14c,when control knob 6 is fully depressed, claws 14c of guide member 10 cause selection member 9 to rotate about control shaft 3 so that radial arms 15 are positioned in notches lOa of guide member 10 and in o~osin~
relation to tapered surfaces 23a of guides 23. Thereafter, u~on relcase o~ the depression force on control knob 6, co~ression s~ring 47 biases drive ~ear 26, and thereby corltrol shaft 3, upwardly, as viewed in Fi~. 8. Because of the relative inclina-tions between tapered surfaces 15a and 23a, selection member 9 is rotated in a predeter~ined direction so that radial arms 15 are biased into shallow grooves 22 o upper holder 4, in which the free ends of radial arms 1~ ale engaged with limiting surfaces 22a. In this rnanner, control shaft 3 is maintained in the second 11'7~67 axial posi~ion shown in FiF,. 8.
In this latter axial position, drive member 26 is positic~ned out of meshing enga~ement with teeth 32a of clutch rign 32. Accordingly, brake shoe 29 is no lon~er frictionally enga~ed with brake disk 4a of upper holder 4, whereupon friction plate 28 is free to rotate about control shaft 3. In this manner, because of the cam action between roller 37 and cam surfaces 30a and 30b, friction plate 28 is caused to rotate ~o its neutral or center ro~ational position in which roller 37 is positioned within navel groove 31. At this time, shutter plate 27 is in its neutral position between the light emitting element and li~ht receivin~ element of detec~or 54, as shown in Fi,~. 5. It is to be appreciated, however, that in the second axial position shown in Fig. 8, the teeth 26a of drive ~ear 26 are maintained in meshing engagement with teeth 45 of disk 40. Since drive gear 26 is only en~aRed with photo-disk 40, the latter disk is free to rotate in either direction ~ithout an~ limits in the an~ular extent of rotation and without any braking force bein~ applied.
As control knob 6 is rotated, the direction of rotation thereof is detected by rotation detectors 55 and 56, as previously discussed. At the sa~e time, the speed of rotation of control knob is de~ected by rotation detector 55 which detects the number of light shieldin~ portions 40a passin~ therethrou~,h.
As a result, the magnetic tape is transported in either a forward or reverse direction and at a speed correspondin~ to the rotational speed of control knob 6. However, when rotation of control knob 6 is halted, position de~ector 54 causes the VTR to operate in its still mode.
-It should be appreciated that each depression of control knob 6 results in the mode selecting device according to this invention passing through the condition shown in Fig. 7 and alternately returning to the positions shown in Figs. 6 and 8. In this manner, continual depressions of control knob 6 cause the mGde selecting device accordin~ to this invention to alternate between the jog mode and the shuttle mode of oPeration .
Havin~ descri~ed a specific preferred embodiment of this invention with reference to the acc~mpanyinp, drawin~s, it is to be understood that the invention is no~ limited to that precise embodiment, and that various changes and modifications may be effected therein by one skilled in the art without dePartinp, from the scoPe or s~irit of the invention as de~ined in the appended claims.
~,9
Claims (22)
1. A device for selecting the mode of operation in an apparatus for reproducing information signals recorded on a record medium during movement of the latter, said device comprising:
rotation means adapted to rotate about an axis;
rotation detecting means for detecting the rotational speed and the angular position of said rotation means about said axis; and latch means for maintaining said rotation means in one of a first and second axial position along said axis, the speed of movement of said record medium being controlled in response to the detection of said angular position when said rotation means is maintained in said first axial position and the speed of movement of said record medium being controlled in response to the detection of said rotational speed when said rotation means is maintained in said second axial position.
rotation means adapted to rotate about an axis;
rotation detecting means for detecting the rotational speed and the angular position of said rotation means about said axis; and latch means for maintaining said rotation means in one of a first and second axial position along said axis, the speed of movement of said record medium being controlled in response to the detection of said angular position when said rotation means is maintained in said first axial position and the speed of movement of said record medium being controlled in response to the detection of said rotational speed when said rotation means is maintained in said second axial position.
2. A device according to Claim 1; in which said rotation detecting means includes means coupled to said rotation means and having a plurality of light shielding por-tions, and photo-coupler means optically associated with said light shielding portions for detecting the rotational speed and the angular position of said rotation means about said axis
3. A device according to Claim 1; in which said rotation means includes a shaft adapted to rotate about said axis, and a control member secured to said shaft for controlling the rotation thereof.
4. A device according to Claim 1; in which said rotation means is adapted to move axially along said axis; and said latch means includes guide sleeve means having first and second groove means of different axial dimensions, selection means adapted to be positioned in one of said first and second groove means for maintaining said rotation means in one of said first and second axial positions, respectively, biasing means for biasing said selection means in a first axial direc-tion into one of said first and second groove means, and guide member means for biasing said selection means out of a respec-tive one of said first and second groove means in response to movement of said rotation means in a second axial direction opposite to said first axial direction.
5. A device according to Claim 4; in which the axial dimension of said first groove means is greater than the axial dimension of said second groove means.
6. A device according to Claim 4; in which said selection means is rotatably and axially mounted on said rota-tion means and includes at least one radially extending arm adapted to be positioned in one of said first and second groove means, and said guide member means is mounted on said rotation means and includes at least one radially extending arm for bias-ing said at least one radially extending arm of said selection means out of a respective one of said first and second groove means in response to movement of said rotation means in said second axial direction.
7. A device according to Claim 6; in which the at least one radially extending arm of at least one of said selection means and said guide member means includes at least one inclined surface, and said biasing means includes first spring means for biasing said selection means towards said guide member means in said first axial direction so that said selection means is rotated about said rotation means by a predetermined angular extent when said at least one radially extending arm of said guide member means biases said at least one radially extending arm of said selection means out of said respective one of said first and second groove means.
8. A device according to Claim 7; in which said first and second groove means are separated by guide sections, at least one of said at least one radially extending arm of said selection means and said guide means having at least one inclined surface, and said biasing means includes second spring means for biasing said rotation means in said first axial dir-ection so that said selection means is rotated about said rota-tion means by a predetermined angular extent and biased into one of said first and second groove means.
9. A device according to Claim 8; in which said first groove means includes a plurality of first axial grooves of a first axial dimension, said second groove means includes a plurality of second axial grooves of a second axial dimension different from said first axial dimension, and said first and second axial grooves are circumferentially arranged in an alter-nating manner about said guide sleeve means.
10. A device according to Claim 1; further including friction means for maintaining said rotation means at a desired angular position when the latter is maintained in said first axial position.
11. A device according to Claim 10; in which said friction means includes brake shoe means axially and rotatably movable with respect to said rotation means and brake disk means, and said device further includes biasing means for biasing said brake shoe means into frictional engagement with said brake disk means when said rotation means is maintained in said first axial position.
12. A device according to Claim 1; further includ-ing limiting means for limiting the angular extent of rotation of said rotation means when the latter is maintained in said first axial position.
13. A device according to Claim 1; further including friction means for maintaining a desired rotational position of said rotation means when the latter is maintained in said first axial position, said friction means being adapted to engage with said rotation means for rotating therewith when said rota-tion means is maintained in said first axial position.
14. A device according to claim 13; in which said rotation means includes a control shaft adapted to rotate about said axis and having a drive gear fixedly mounted thereon, and said friction means includes an annular member having a central aperture through which said control shaft is disposed, said aperture including clutch means adapted to engage with said drive gear when said rotation means is maintained in said first axial position.
15. A device according to Claim 1; further including mode detecting means for producing a signal corresponding to the axial position of said rotation means.
16. A device according to Claim 15; in which said mode detecting means includes tab means coupled to said rotation means and adapted to move axially therewith, and a mode detec-tor for detecting the axial position of said tab means.
17. A device according to Claim 1; further includ-ing center position detecting means for detecting a center rotational position of said rotation means when the latter is maintained in said first axial position, said center rotational position corresponding to a still motion mode of said record medium.
18. A device according to Claim 17; in which said center position detecting means includes a shutter plate rotatable with said rotation means about said axis, and a center position detector for detecting the angular position of said shutter plate from said center rotational position.
19. A device according to Claim 18; further includ-ing return means for returning said shutter plate to said center rotational position when said rotation means is maintained in said second axial position.
20. A device according to Claim 19; further including annular friction means adapted to rotate with said rotation means about said axis and having an outer circumferential portion on which said shutter plate is mounted and having a first surface, and said return means includes at least one cam surface mounted on said first surface, roller means and biasing means for biasing said roller means into engagement with said at least one cam sur-face so as to return said shutter plate to said center rotational position when said rotation means is maintained in said second axial position.
21. A device according to Claim 1; in which the rotation detecting means further detects the direction of rotation of the rotation means about said axis, and the direc-tion of movement of the record medium is controlled in response to the detection of the direction of the rotation when said rotation means is maintained in said first and second axial positions.
22. A device for selecting the mode of operation in an apparatus for reproducing video signals recorded on a record medium during movement of the latter, said device comprising:
a control shaft adapted to rotate about an axis;
a control member for manually controlling the rotation of said control shaft about said axis;
latch means for maintaining said control shaft in one of a first and second axial position along said axis;
drive gear means fixedly mounted on said control shaft;
rotation detecting means for detecting the rotational speed and the angular position of said control shaft about said axis;
brake member means;
friction means having clutch means adapted to engage with said drive gear means when said control shaft is maintained in said first axial position and which is disengaged from said drive gear means when said control shaft is maintained in said second axial position;
spring means for biasing said friction means into engagement with said brake member means when said control shaft is maintained in said first axial position so as to maintain said control shaft at a desired angular position;
center position detecting means for detecting a center rotational position of said control shaft when the latter is maintained in said first axial position, said center rotational position corresponding to a still motion mode of said record medium, said center position detecting means including a shutter plate coupled to said control shaft when the latter is maintained in said first axial position; and return means for returning said shutter plate to said center rotational position when said control shaft is maintained in said second axial position.
a control shaft adapted to rotate about an axis;
a control member for manually controlling the rotation of said control shaft about said axis;
latch means for maintaining said control shaft in one of a first and second axial position along said axis;
drive gear means fixedly mounted on said control shaft;
rotation detecting means for detecting the rotational speed and the angular position of said control shaft about said axis;
brake member means;
friction means having clutch means adapted to engage with said drive gear means when said control shaft is maintained in said first axial position and which is disengaged from said drive gear means when said control shaft is maintained in said second axial position;
spring means for biasing said friction means into engagement with said brake member means when said control shaft is maintained in said first axial position so as to maintain said control shaft at a desired angular position;
center position detecting means for detecting a center rotational position of said control shaft when the latter is maintained in said first axial position, said center rotational position corresponding to a still motion mode of said record medium, said center position detecting means including a shutter plate coupled to said control shaft when the latter is maintained in said first axial position; and return means for returning said shutter plate to said center rotational position when said control shaft is maintained in said second axial position.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP139622/80 | 1980-10-06 | ||
| JP55139622A JPS5764348A (en) | 1980-10-06 | 1980-10-06 | Mode switching device of recorder and reproducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1171167A true CA1171167A (en) | 1984-07-17 |
Family
ID=15249565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000387140A Expired CA1171167A (en) | 1980-10-06 | 1981-10-01 | Mode selecting device for a video signal reproducing apparatus |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US4428005A (en) |
| JP (1) | JPS5764348A (en) |
| AT (1) | AT376318B (en) |
| AU (1) | AU538748B2 (en) |
| CA (1) | CA1171167A (en) |
| DE (1) | DE3139577A1 (en) |
| FR (1) | FR2491707B1 (en) |
| GB (1) | GB2088114B (en) |
| NL (1) | NL192641C (en) |
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| JPS61189424U (en) * | 1985-05-20 | 1986-11-26 | ||
| JPH0816997B2 (en) * | 1985-12-27 | 1996-02-21 | ソニー株式会社 | Video playback device remote control device and video playback system |
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| JPS62175796A (en) * | 1986-01-30 | 1987-08-01 | ヤマハ株式会社 | Automatic performer |
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| GB2204858A (en) * | 1987-05-15 | 1988-11-23 | Marion Mary Mcnulty | Winding web |
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| JP2822253B2 (en) * | 1990-02-06 | 1998-11-11 | ソニー株式会社 | Video signal playback device |
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-
1980
- 1980-10-06 JP JP55139622A patent/JPS5764348A/en active Granted
-
1981
- 1981-10-01 CA CA000387140A patent/CA1171167A/en not_active Expired
- 1981-10-02 AU AU76015/81A patent/AU538748B2/en not_active Ceased
- 1981-10-05 DE DE19813139577 patent/DE3139577A1/en active Granted
- 1981-10-06 NL NL8104547A patent/NL192641C/en not_active IP Right Cessation
- 1981-10-06 US US06/309,026 patent/US4428005A/en not_active Expired - Fee Related
- 1981-10-06 AT AT0428781A patent/AT376318B/en not_active IP Right Cessation
- 1981-10-06 FR FR8118804A patent/FR2491707B1/en not_active Expired
- 1981-10-06 GB GB8130187A patent/GB2088114B/en not_active Expired
Also Published As
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| AU7601581A (en) | 1982-04-22 |
| DE3139577C2 (en) | 1992-12-10 |
| NL192641C (en) | 1997-11-04 |
| NL8104547A (en) | 1982-05-03 |
| ATA428781A (en) | 1984-03-15 |
| JPS5764348A (en) | 1982-04-19 |
| DE3139577A1 (en) | 1982-07-15 |
| JPH0150016B2 (en) | 1989-10-26 |
| FR2491707B1 (en) | 1986-02-21 |
| GB2088114A (en) | 1982-06-03 |
| GB2088114B (en) | 1985-09-25 |
| NL192641B (en) | 1997-07-01 |
| US4428005A (en) | 1984-01-24 |
| FR2491707A1 (en) | 1982-04-09 |
| AU538748B2 (en) | 1984-08-23 |
| AT376318B (en) | 1984-11-12 |
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