DE2339258A1 - Lamp changing mechanism for still projector - has carriage with lamps movable at right angles to optical axis - Google Patents

Abstract

The carriage bearing two or more sockets and projection lamps is fitted on parallel bars which are fixed horizontally at right angles to the projector's axis. The lamp in the projection position is automatically connected by spring contacts to the power supply. In one version the carriage is moved by a manual control handle which engages locating recesses for each lamp position. The recesses are made in a sliding strip with lateral adjustment for fine positioning. In an alternative version the carriage is held against spring tension by an electromagnetic latch wired into the lamp circuit. The latch opens on lamp failure and the carriage moves automatically against a fixed stop to place the replacement bulb in the operating position. The design minimises stoppages during a programme.

Description

PATENT Attorneys ty qqq * \ rp

iffer grains <L

MUNICH 22 WIDENMAYERSTRASSE 49 1 BERLIN-DAHLEM 33-PODBIELSKIALLEE68

BERLIN: DIPL.-ING. R. MULLER-BORNER MUNICH: DIPL.-ING. HANS-H. WEY

2k 898/9

Braun Aktiengesellschaft, Frankfurt (Main),

and

Enna-Werk Optical Institute Dr. Appelt KG,

Munich

Device for changing lamps in the lighting system of projection devices

The invention relates to a device for changing lamps of the lighting system of projection devices during operation with a slide that carries at least two lamps and is movable transversely to the optical axis, Carriage or the like. Which can be locked in one of the positions corresponding to the number of lamps, and which actuates contacts, so that only the lamp located in the optical axis is in the lamp circuit is switched on.

There are already projection devices known that are equipped with a lighting system, which has two lamps, which alternate as desired

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BERLIN: TELEPHONE (O311) 76 29 O7 MUNICH: TELEPHONE (08 11) 22 55 85

CABLE: PROPlNDUS TELEX OI 84057 CABLE: PROPINDUS TELEX O5 24244

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or after. Failure of a lamp in the optical axis of the optical system can be pivoted. However, these known lamp changing devices have the disadvantage that whose lamps do not have a clearly defined position, so that after the lamps have been changed, the lamps are ready for operation Lamp is located exactly in the optical axis. It is true that in one of the previously known devices, the ready-to-operate lamp can be adjusted subsequently or an adjustment could be made with another, but only relatively cumbersome and not from the outside when the device is ready for operation. As practice has shown, these are disadvantages of slide projections especially in the context of a lecture at lectures etc., if it matters, an unusual one Lamp in the shortest possible time by an operational Replace the lamp in order to avoid undesired interruptions.

The invention has for its object to provide a device that, in the event of a lamp failure, of the Lighting system of projection devices enables this can be quickly and easily replaced with a new lamp, so that the projection of images during a Lecture or the like does not need to experience any noteworthy interruption.

To solve the problem described above, it is proposed that a lamp changing device of the type under consideration for the lighting system of projection devices train during operation in such a way that each lamp is on a movable slide or slide its own stop is assigned and that each stop for the purpose of adjusting the lamp assigned to it in Transverse direction to the optical axis is individually adjustable.

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This makes it possible in the event of a lamp failure a simple movement of the carriage or the like. To bring the reserve lamp into the correct position, with it lights up at the same time and is already in its correct position without any further position corrections would have to be made. The move process can can be done manually with a simple movement or, if necessary, also take place automatically.

To determine the positions of the slide or carriage, in which the selected lamp lies exactly in the optical axis, stops are provided that are adjustable, in order to be able to adjust the lamps in the transverse direction to the optical axis. It is also possible to have fixed stops for the Provide slide or slide and the lamp sockets in the transverse direction to the optical axis for the purpose of adjustment to train the lamps adjustable.

In the case of a particularly simple and practical one that can be operated manually The device for the quick lamp change is at the optical axis transversely movable slide or carriage a right-angled to the direction of movement elastically resilient hand lever arranged, which engages under the action of its spring tension in each case in a section of a notch plate. the Notch plates themselves can also be moved and adjusted in the transverse direction in order to set the notch in that position in which the lamp in question is located exactly in the optical axis. If one forms the slide as Rotary valve off, so there are expediently cams on this arranged, which engage in adjustable, resilient detents.

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Furthermore, according to the invention, it is possible to use the device to form in such a way that the base of the lamps on an adjustable by means of a screw on the slide adjustably mounted support plate are arranged that the carriage by means of two stationary stops in the ge ~ desired position can be locked.

In Figs. 1 to 3 of the drawings, the subject matter of Invention illustrated using a few preferred exemplary embodiments, which are described in detail below are. Show it:

1 shows a view of a lamp changing device
with two on one linear and transverse to
optical axis sliding carriage;

Fig. 2 shows a device zqdi changing three

Lamps arranged on a rotary valve are ;

3 shows a device for automatic changing

two lamps arranged on a sole.

As F ^ g. 1 shows, the carriage 11 is mounted on two guide rails 12 such that it can be displaced in the transverse direction to the optical axis A. On the carriage there are two sockets 13 for the two lamps L, which are arranged at a sufficient distance from one another . On the carriage 11 sits the resilient lever Ik, which under the action of its spring tension in the
Notches 1 £, 15 ^{f of} the notch plates 16, 16 «engages. the
Notch plates 16, 16 * are adjustable parallel to the direction of movement of the carriage 11 for the purpose of adjusting the lamps L in the projection position. An eccentric

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disk 17t which ^{sits on the} shaft 18 and has a slotted head 19. The eccentric disk 17 engages in a cutout 20 in the notch plate 16, I6 ^f . By rotating the eccentric disk 17, the notch plates can be shifted slightly to the right or left.

In order to be able to replace the lamp L located in the optical axis A with the operational lamp in the event of a failure, the lever 14 is pressed by hand in order to bring it out of the notch 1f> of the notch plate 16. Then, the slide can be moved 11 to the left until the lever ~ \ in the catch 15 of the detent plate i6 * ^f engages. In this position the second lamp is exactly in the optical axis. During the movement of the carriage 11, the contacts of the switch 22 are actuated via a lever arm 21, so that the replacement lamp lights up automatically when it has reached the projection position in the optical axis. In the second exemplary embodiment according to FIG. 2, a slide 32 is provided which is rotatable about axis 31 and on which three lamp sockets 33 for the three lamps L are arranged. At the edge of the slide there are three cams Jk _t which actuate the switch 35, which switches on the lamp in the projection position in the lamp circuit. To the rotary valve in each. To maintain the correct position, three cams 36 protruding close to the outside are arranged in different heights. Each of the nooks is assigned an adjustable detent 37, which consists of a resilient sheet metal strip 38, the free end 39 engages in a slot of the holder 40, and which can be moved back and forth by the adjusting screw kl to set the desired position . In order to have the lamp quick-whistle 1 of a lighting system in question take place automatically, for example, as can be seen from FIG. 3,

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the carriage 51 ^a *> a pull rope 52 to which the tension spring 53 engages. The tension spring is preferably arranged outside the exposure to heat of the lighting system. The slide is held in its first position by the stop $ h , which is under the action of the electromagnet 55, the coil of which is located in the lamp circuit. If the lamp L located in the optical axis A fails, the coil of the electromagnet 55 is de-energized and the spring 56 pushes the stop 54 back, so that the path of the slide 51 is released. Under the action of the spring 53, the carriage is now pulled to the right against the stationary stop 57, so that the second lamp L * is then in the projection position. In order to be able to adjust the lamps arranged on the carriage 51, their sockets are fastened to support plates 59 which can be pivoted about the bolts 58. To pivot the support plates 59 there are angle levers 60 with threaded holes into which the adjusting screws 61 mounted on the slide 5I are screwed. The switch 62 ensures that the second lamp is switched on after the sliding movement of the carriage.

Let through the devices designed according to the invention the lamps of projection devices quickly and easily so that the projection process only occurs during one interrupted for an extremely short period of time.

Claims 1

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Claims (1)

- 7 - Claims M .J Device for changing the lamps of the lighting system of projection devices during operation with a slide, slide or the like which carries at least two lamps and is movable transversely to the optical axis (A) and which can be locked in one of the positions corresponding to the number of lamps, and which contacts actuated so that only the lamp located in the optical axis is switched on in the lamp circuit, characterized in that each lamp is assigned its own stop on a movable slide or slide and that each stop is for the purpose of adjustment the lamp assigned to it is individually adjustable in the transverse direction to the optical axis (a). 2. Device according to claim 1, characterized in that that the lamp sockets can be adjusted in the transverse direction to the optical axis (A). 3. Device according to claim 1 or 2, characterized in that one on the slide or slide (11) arranged, Hand lever (14), resiliently springy at right angles to the direction of movement, can be adjusted in cutouts (15 | 15 *) Notch plates (16; 16 ″) engages (Fig. 1). k. Device according to Claim 1 or 2, characterized in that cams (36) arranged on the slide or slide (32) engage in catches (37) on resiliently mounted metal sheets (38) (Fig. 2). -8th- 509807/0606 5 «device according to one or more of claims 1 to 4, characterized in that the base of the lamps (1) is on an adjustable by means of an adjusting screw (61) the carriage (51) adjustably mounted support plate (59) are arranged that the carriage (51) by means of two Fixed stops can be locked in the desired position. 6. The device according to claim 5t, characterized in that the carriage (5I) is under the action of a tensioned spring (53) and is held in its first position by an electromagnetically actuated stop {$ k) , the coil of the electromagnet (55) is in the circuit of the main lamp (1) and that the carriage (51) is held in its second position by a stationary stop (57). 509807/06 0 6