US2201954A - Grinding machine - Google Patents

Description

y 21, 1940- c. G. FLYGARE 2,201,954

GRINDING MACHINE Filed Oct. 15, 1958 5 t 5 1 3 Wu Orr/Yem- & if (041141! A Qh Q7 z T R.

mu rv CHRLGFLYGHHE y 21, 1940- c. s. FLYGARE 2,2013954 GRINDING MACHINE Filed Oct. 15, 1938 5 Sheets-Sheet 2 F us. 4 M

EHRL EFLYGHRE y 1940- c. G. FL YGARE GRINDING MACHINE Filed Oct. 15, 1938 3 s t -sh t 3 Patented May 21, 1940 GRINDING MACHINE Carl G. Flygare, Worcester, Mass, assignor to Norton Company, Worcester, Mass, at corporation of Massachusetts Application October 15, 1938, Serial N0. 235,122

1 Claim.

This invention relates to grinding machines, and more particularly to a large cylindrical grinding machine.

One object of the invention is to provide a simple and thoroughly practical precision grinding machine such as a large roll grinding machine having a massive reciprocable table for supporting a work piece or the rotatable grind- 7 ing element. A further object of the invention 1 is to provide a large cylindrical grinding machine having a reciprocable table upon which are mounted a plurality of electric motors, with a power transmitting mechanism for conveying electric current to the motors on the table durl ing reciprocation of the same. A further object of the invention is to provide an improved electric power transmitting mechanism for conveying electric current to a motor or motors on a reciprocable table. Other objects will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements, and arrangements of parts, as will be exemplified in the structure to be hereinafter described, and the scope of the application of which will be indicated in the following claim.

In the accompanying drawings, in which is shown one of various possible embodiments of the mechanical features of this invention.

Fig. 1 is a front elevation of a roll grinding machine of the wheel traverse type .showing the improved electric power transmission mechanism;

Fig. 2 is a fragmentary elevation, on an enlarged scale, of the electric power transmitting mechanism;

Fig. 3 is a fragmentary elevation, on an enlarged scale, of the cable carrier and the power transmission mechanism;

Fig. 4.- is a fragmentary cross sectional view, on

an enlarged scale, taken approximately on the line 4 l, showing the grooved pulleys for supporting a plurality of power transmitting cables;

Fig. 5 is a fragmentary sectional view, on an enlarged scale, taken approximately on the line 5-5 of Fig. 3, showing the idler pulley forsupporting the cable supporting belt; and

Fig. 6 is a schematic electric wiring diagram of the machine.

This invention is particularly applicable to a I large massive cylindrical grinding machine for grinding large rolling mill rolls and the like which may be either one of two types, namely, a work traverse type machine or a Wheel traverse type machine. In either case the work piece is sup- ;ported on centers and steadied by journal rests while either the work support or the grinding wheel support is recipro cated longitudinally to produce a relative longitudinal reciprocatory movement between the work piece to grind t thereof.

A cylindrical grinding grinding wheel and he peripheral surface machine of the wheel movable wheel slide Hi.

The wheel slide [4 supports a rotatable wheel spindle having a grinding wheel l5 on its outer end which is partially surrounded by a Wheel guard It.

A power driven mechanism is provided for rotating the grinding wheel [5 comprising an electric motor H which is mounted on the uppe slide. M. The motor I! r surface of the wheel is connected to rotate the wheel spindle by means of a multiple V-belt drive I8 contained within a guard 19 supported on the wheel slide M.

A suitable power opera ted grinding wheel carriage reciprocating mechanism (not shown) is provided to reciprocate longitudinally. This me illustrated in the present sidered to be part of the present invention.

the grinding wheel l5 chanism has not been case since it is not con- This mechanism may be of the type shown in the prior patent to Norton No. 1,096,188 dated May 12, 1914, to which reference may be had for details of disclosure of the wheel reciprocating mechanism not found h erein. The wheel earriage reciprocating mechanism is contained within a housing 25 supporte of the longitudinally reci H. A manually operabl whereby the carriage H d on the upper surface procable wheel carriage e Wheel 26 is provided may be manually adjusted, if desired. During the normal operation of the machine, the wheel carriage reciprocating mechanism is power driven by means of an electric motor 21 mounted on the upper surface of the housing 25.

The motor 21 is connected by means of a belt drive contained within a belt guard 28 to drive the wheel carriage reciprocating mechanism.

A feeding mechanism is provided for producing a relative transverse movement between the grinding wheel and the work piece to grind the work to the required and predetermined size. In the present case, as illustrated, the wheel slide :4 is mounted for a trans relative to the table H.

verse feeding movement This is preferably acsit complished by means of a wheel feeding mechanism contained within a casing 30, said mechanism being driven by means of an electric motor 3| mounted on the upper surface of the longitudinally reciprocable carriage II.

The work piece to be ground is supported by means of a headstock 35 and a footstock 36 which are fastened to a swivel table 37 which is in turn adjustably fixed on the base I0 of the machine. The work piece is rotatably supported by means of a headstock center (not shown) and a footstock center 38 for rotation in operative relation with the grinding wheel I5. The headstock 35 is preferably motor driven by an electric motor 40 mounted on top of the headstock 35. The motor 40 is connected by means of a multiple V-belt drive contained within a belt guard 4| to rotate the headstock spindle (not shown) to rotate the work piece for a grinding operation.

A machine of the type illustrated in the drawings is particularly designed and intended for grinding work pieces up to forty feet or more in length and one foot or larger in diameter. In such a machine with a table reciprocatory stroke of forty feet, more or less, it is desirable to provide an electric power conveyin means so that during the reciprocatory stroke of the table or wheel carriage Ii, electric current may be trans mitted to the electric motors I1, 21 and 3|. In order to attain the primary object of this invention, it is desirable to provide an improved electric power transmitting means whereby with a minimum length of electric cable, electric power may be conveyed to the reciprocating table during its entire maximum length of stroke. Power is transmitted to the machine from any suitable source by means of a cable 5%] to a junction box 5| which is fixedly mounted at the right hand end of a channel iron 52. The channel iron 52 is supported by brackets 53, 54, 55, 55 and 51 which are fixedly supported on the base !0. The inner area of the channel iron 52 is covered with strips of insulating material, such as a wood base 58 and side strips 59 and 60 (Figs. 4 and 5). This insulated area within the channel iron 52 serves as a trough to support electric power cables 65, 66, 61, 68, 69 and 10. The cables to 10 inclusive have one of their ends fixedly connected within the electric junction box 5I (Figs. 1 and 2) and are connected therein to the power cable 50. The cables 65 to I0 inclusive extend from the junction box 5! (Fig. 2) along the channel iron trough toward the left and wrap around the peripheries of grooved pulleys 'II, I2, a pulley I3, and grooved pulleys M and 15. These cables then extend toward the right (Fig. 2) and have their other ends connected by a bracket 16 located at the right-hand end of the longitudinally reciprocable wheel carriage II (Figs. 2 and 3). These cables are then connected by means of flexible cables or conduits, such as conduit 7'! which is in turn connected through an electric control box I8 to the electric motors I7, 21 and 3|, respectively, to transmit power thereto during the longitudinal reciprocatory movement of the carriage I I.

The pulleys II to 1'5 inclusive are rotatably supported on a shaft which is supported on a longitudinally movable cable carrier 8|. The cable carrier 8| is provided with spaced pairs of rollers 82 and 83 which ride upon the upwardly extending side walls of the channel iron 52 which serve as guideways for the longitudinally movable cable carrier 3|.

It is desirable that the cable carrier 8| be moved longitudinally by and in timed relation with the longitudinal reciprocatory movement of the wheel carriage II so that when the carriage II moves toward the left (Figs. 1, 2 and 3), the cables 65 to l0 inclusive will be laid out and supported on the insulating strips within the channel iron 52. As the carriage II moves toward the left, the length of cable between the bracket 76 and the pulleys II to '55 inclusive will be increased as the cable is picked up from the trough or channel iron 52. The cable carrier 8| is preferably arranged so that it may travel in the same direction as the carriage II and at one-half the speed thereof in order to maintain the cables taut during the entire reciprocatory movement of the carriage I I. The traverse of the cable carrier E! is preferably accomplished by providing a cable which wraps around an idler pulley 9I rotatably supported on a shaft 92 on the cable carrier at. The upper end of the cable 90 is fastened by means of a bracket 93 to a depending lug 9 on the left-hand end of the longitudinally reciprocable carriage II. The lower end of the cable 90 is connected by a bracket 95 with a plate 08 which is fastened to the left-hand end of the channel iron 52 (Figs. 1, 2 and 3). It will be readily apparent from the foregoing disclosure that when the grinding wheel carriage II is moved toward the left (Figs. 1, 2 and 3), the upper end of the cable 90 is pulled along with the carriage II. This movement rotates the idler pulley sI on its supporting shaft 92 and causes an endwise movement of the cable carrier 8I toward the left, in the same direction as and at one-half the speed of the grinding wheel carriage II. When the wheel carriage I I starts moving toward the right, the cables 65 to 70 inclusive being fixed at their upper ends to the clamping member IE on the end of the carriage II and their lower ends being fixed within the junction box 52 fixed to the base I0, the cables will serve to aid in moving the cable carrier SI toward the right, that is, in the same direction and at onehalf the speed of the grinding wheel carriage II.

Due to the length of the cables 65 to 10 inclusive, when the carriage I I is extended to its extreme position toward the right (Fig. 1), it is desirable to provide intermediate supports for the electric power cables so that they will not sag or become stretched during continued movement thereof. As shown in Figs. 1 and 2, idler pulleys or rollers I00 and MI are rotatably supported on the base of the machine and are of sufficient width to aid in supporting all of the cables 65 to I0 inclusive. In order to supplement the idler rollers I00 and IOI, a flexible belt I02 of a width slightly greater than the cables 05 to '10 inclusive is provided. This belt extends over the idlers I00 and IIJI and is attached at one end to a clamp I03 which is fixed to the bracket 76 at the righthand end of the carriage H. The belt I02 passes around the periphery of a grooved pulley I04 which is rotatably supported on a shaft I05 carried by the cable carrier 8| The lower portion of the belt I02 which wraps around the pulley I04 extends toward the right (Figs. 1, 2 and 3) and is adjustably and yieldably connected by means of a spring I06 and a screw I0! to a bracket I08 fixedly mounted at the end of the channel iron 52. By adjusting the screw I 01 relative to the bracket iIlB, the tension of the spring I06 or springs I06 may be varied to tension the belt I02 as desired adequately to support and prevent sagging of the cables 65 to '10 inclusive as the carriage II is reciprocated. The belt I02 also aids the cables to H3 inclusive in moving the. cable carrier 3| toward the right when the carriage H is traversed toward the right.

The operation of this improved electric power transmitting mechanism for motors on reciprocable grinding machine carriages or tables is readily apparent from the foregoing disclosure. Current from a source of supply is fed to the junction box 5| by means of a cable 50. The current then passes through the cables 65 to '10 inclusive which wrap around the pulleys on the cable carrier 8| and have their other ends connected to the bracket 16 at the right-hand end of the carriage H from which current is conveyed by conduit 1'! to the motors i1, 2'! and 3!, respectively, to transmit power thereto during the entire reciprocatory stroke of the carriage ll.

While a machine of the grinding wheel traverse type has been illustrated in the drawings, this invention is equally applicable to the other common type of grinding machine, namely, the work table traverse type machine in which the rotatable work piece is mounted on the longitudinally reciprocable carriage, such as, for example, that shown in the prior patent to Dunbar No. 1,466,893 dated September 4, 1923.

It will thus be seen that there has been provided by this invention apparatus in which the various objects hereinabove set forth together with many thoroughly practical advantages are successfully achieved. As many possible embodiments may be made of the above invention and as many changes might be made in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth or shown able idler pulley thereon, a longitudinally extended inverted channel iron fixed to said base, said channel iron serving as a guideway for said carrier, an electric junction box fixedly mounted at one end of said channel iron, a flexible power cable having one end connected to said box, said cable extending along said channel and partially wrapping around said pulley, connections between the other end of said cable and the carriage, a second idler pulley on said carriage, a

flexible belt which partially wraps around the .3

latter pulley and has one end fixed to the end of said channel iron and the other end fixed to said reciprocable carriage, said belt serving as a support for the power cable when extended and also serving to move the carrier in one direction during the carriage movement, and independent means including a flexible cable which wraps around a third idler pulley on said carriage and has one end fastened to the carriage and the other to the base actuated by and in timed relation with said carriage to move said carrier longitudinally in the opposite direction and at one-half the speed of the carriage.

CARL G. FLYGARE.

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