DE1054732B - Image changing device for projector or viewer - Google Patents

Description

The subject of the present invention forms an image changing device for projector or viewer, in which the frontmost image of a magazine is separated from the stack by a lifting device and is relieved of the stack pressure. It falls into the image window by free fall. With a well-known Image changing device of this type is the image stack of the in a known manner on its front open magazine on the front wall of the chute with the picture window. Of the Image change takes place in such a way that a rotatable one arranged under a bottom slot of the magazine Huborgan moves the image behind the foremost image upwards against an inclined surface which slides the lifted picture with its upper edge as it is lifted further, creating the entire stack of pictures against a pressing device is moved away from the foremost picture, so that it, from Stack pressure is released when pulling the from the picture window into the lower end of the chute falling image can slip into the image window.

The mentioned lifting device is operated via a lever linkage, which is activated when the in the lower part of the chute is actuated by the image in question.

In contrast, the picture changing device of the present invention has the advantage that not the entire stack of images is to be moved against the action of the pressing device, but only that in each case Foremost picture only in the direction of movement of the lifting element itself. Of particular advantage is also that the stack pressure even then brings the foremost image into its position in which it is in front Stack pressure can fall freely into the chute-like picture holder. So there are little forces to be expended and the means used allow a fully automatic image change without further ado the movable holder can serve as a drive for the lifting element or vice versa, the lifting element the drive for the movable picture holder.

This is achieved according to the invention in that the frontally open removal magazine has an upper and Lower fixed installation fold for the image stack that is only pressed against it in the area of the lower installation fold and immediately behind the upper fold a free passage for the foremost picture and immediately in front of and behind the lower fold each has a slot, of which the front one is the dropout slot for the image and the rear one forms the passage slot for a lifting element through which When actuated, the foremost picture can be pushed out over the fold forming a fixed compartment step.

Further details can be found in the schematic picture changing device for projectors
or viewer

Applicant:
Erich Zillmer, Braunschweig-Lehndorf _f
Saarbrückener Str. 263

Erich Zillmer, Braunschweig-Lehndorf,
has been named as the inventor

an embodiment illustrative drawing described.

Above a picture window B arranged in the wall W of a projector or viewer, the removal magazine E is attached, in which the picture stack 6 is under tensioning pressure from a pressing device 28, which in the case of the present invention is only effective in the lower area of the picture stack.

The removal magazine E is open at the end in a manner known per se and is provided with folded edges 1 and 2 at the top and bottom as a system for the next-wall picture 6 of the stack.

The top wall and bottom of the removal magazine E each have a passage slot 5 and 11 for an image 6 or a slide 7.

The picture holder 4 can now form a chute which is open at the bottom and which can be pivoted about pin 3 in the direction of the optical axis into an inclined position (dashed lines) in which it holds the picture 6 held by it in front of the picture window B , which is on a console 10 supports the wall W, pushes it down from this console 10 so that it can fall into a receiving magazine, not shown.

During this pivoting into the inclined position shown in dashed lines, a z. B. penetrated by a tongue 8 with the picture holder 4 coupled slide 7 into the slot 11 of the removal magazine E and has the next wall picture 6, which pushes through slot 5, raised to the level of the folded edge 2, on its cutting edge 9 it settles with its lower edge. It is relieved of the pressure of the image stack 6 (pressing device 28), since this pressure is absorbed by the slide 7.

As soon as the slide 7 and the picture holder 4 have returned to their original position, it snaps Stack of images 6 under the effect of the pressure

809 789/228

Claims (2)

direction 28 forward, the image 6 being pushed down from the edge 9 of the folded edge 2 and thrown into the image holder 4. The folded edge 2 thus acts as a step for the next image 6 of the stack, which is closest to the wall. The manually, electromagnetically, pneumatically or hydraulically operated drive of the picture changing device can act via the picture holder 4 or via the slide 7, and with this drive a cover panel or a lamp circuit can be coupled which covers the picture window B or during the picture change darkened. Patent claims: 1. Image changing device for projector or viewing in which the frontmost image of a magazine is relieved of the stack pressure by a lifting device and separated from the stack, characterized in that the frontally open removal magazine (E) has an upper and lower fixed contact fold (1 and 2) for the stack of images that is pressed against this only in the area of the lower abutment fold (2) and immediately behind the upper fold (1) has a free passage (5) for the foremost picture (6) and immediately in front of and behind the lower fold (2) a slot, of which the front is the dropout slot for the picture and the rear (11) is the passage slot for a lifting element (7) , the actuation of which the foremost image (6) can be pushed out over the fold forming a fixed compartment step (2). 2. Image changing device according to claim 1, characterized in that the lifting member (7) has one with the z. B. for the purpose of planting the image in, a receiving magazine in the direction of the optical axis movable image holder (4) coupled, vertically up and down movable slide, which is beveled at its front boundary surface and with its rear boundary surface temporarily as the stack pressure absorbing lower fold of the image stack serves. Considered publications:
German Patent No. 721 035;
Swiss patent specification No. 251 694. 1 sheet of drawings © 809 789/228 3.59