DE2738237A1 - SLIDE PROJECTOR WITH AN IMAGE CHANGING DEVICE - Google Patents

Description

AGFA-GEVAERT AG

³ CAMERA-WERK MUNICH

“ATVNT ASTSH. US

23rd August 1977 PK 490 / MK 931 10-hl-hh

Slide projector with a picture changer

The invention relates to a slide projector according to the preamble of claim 1.

Slide projectors of this type are widely used in numerous embodiments. Most of them have a single transport pusher or a gripper is provided, which transports the slides from the magazine into the picture stage and then back again. In such Projectors, there is a pause in the dark during the transport phase, which especially when projecting in darkened rooms disturbs the viewer in the long run.

Therefore projectors with two projection systems are common in which the slides are alternately projected superimposed on each other. Because of the double effort for the optical system, these projectors are more expensive and also considerably larger than simple projectors.

909809/0451

PK 490 / MK 931 - 4 -

There is already a known projector in which with a single optical system a faster image change is achieved. The projected slide is directed towards the projection lens pushed closed and the next one brought by the transport slide into the image plane, with the projected one at the same time Slide is returned to the magazine.

It is the aim of the invention to provide a slide projector with a particularly simple change mechanism and with a shortened dark pause to accomplish.

According to the invention, this is made possible by the features according to the characterizing feature Part of claim 1 achieved.

Details of the invention emerge from the description in which it is discussed with reference to a drawing. Show it

Figure 1 the change mechanism in a perspective view

FIG. 2 shows the subject of FIG. 1 schematically from above.

Figures 1 and 2 show slides 1 to 3 and 5 to 8 in the magazine and a slide 4 in the projection position. The transport slide 9 is via a gear 10 in opposite directions in operative connection with the transport slide 11, which is known per se and therefore not shown in a manner via a crank loop

909809/0451

PK 490 / MK 931 - 5 -

is driven. The transport slide 11 carries a transport pawl 12 on a pin 11a , which has a dead center spring

12 a and spring-loaded onto the transport slide 11 with the pin 12 b is. During the transport movement the slide 4 in the channel

13 is pushed out of the beam path is simultaneously the next slide 5 in the channel 14 is pushed into the projection beam path and at the end of this transport movement by the pressure spring 15 brought into the projection plane. During this transport stroke, the diaphragm wing 15 initially follows immediately a pin 11b of the transport slide 11 and darkens in the process the beam path. At the end of the transport movement, the diaphragm blade 15 is returned to the starting position by the transport slide 9 pushed back and held by a pawl 16.

When the transport slide 9 and 11 return, the transport pawl runs 12 on the pawl 17 and is thereby reversed so that during this return phase the pawl nose 12 c under the next slide 5 in projection. At the end of the return movement is then aligned the transport pawl 12 on a curve 18 fixed to the housing. The magazine can then be transported.

For the reverse shift, the operative connection between the transport slide 9 and 11 is separated, for example, by an axial stroke of the gear wheel 10 or a suitable coupling. During the transport stroke, the transport slide 11 is then driven and thus the slide 4 is pushed into the magazine. It then follows the

909809/0451

PK 490 / MK 931 - 6 -

273823?

Reverse movement of the transport slide 11 and the reverse!.; .-fende transport step of the magazine. For the projection de.-;
Subsequent slides then become the operative connection of the transport. slider restored.

1 sheet of drawings

909809/0451

Claims (1)

AGFA-GEVAERT AG LEVERKUSEN 9.7'ί ft? ^ 7 CAMERA-WERK MUNICH August 23, 1977 PK 490 / MK 931 10-hl-hh Expectations 1. Slide projector with a picture changing device for removing slides to be projected from a magazine, transferring them to a picture stage and returning the projected slides to the magazine, whereby for faster slide change there: projected and the slide to be projected in different :, transport levels from the picture stage out or in dieselL ·. can be transported in, characterized in that the image change can be carried out by two transport slides (9) and (11) which are operatively connected in opposite directions, the first transport slider (9) for transporting the slides from the magazine into the image stage and the second transport slider (11) ) is used for the return transport into the magazine and that the second transport slide (11) has a pivoting transport pawl (12), the contact surface (12c) of which pushes the slide to be transported back into the magazine during return transport and then moves back into the starting position from the beam path can be swiveled out. ... 909809/0 4 51 BATH ORIGINAL PK 490 / MK 931 - 2 - 2. Slide projector according to claim 1, characterized in that for darkening the beam path during the image change a wing panel (15) is provided. 9 0 9 8 0 9/0451