Abstract: A projection original film feeding apparatus is provided with a feeder for feeding original film to a projecting position, a sizer for outputting size information of the original film, and a controller for varying the amount of feed the original film by the feeder to conform with the size information from the sizer and setting the original film at a regular projecting position for each size irrespective of the size.

Abstract: A drum-type slide magazine having a compartment body (11) which surrounds a magazine hub (1) and includes a series of radially extending compartment walls (15) to form slide compartments (17). The compartment body (11) is designed as a body separate from the hub (1) which is fixedly connected with said hub (1) by a connecting element (37).

Abstract: The invention relates to a slide magazine with housing, open at the top, a slide projector with a picture-changing device having a horizontally actuated slide pusher. The housing, which can be mounted immovably in the projector, has, approximately in the longitudinal center of a longitudinal wall, an opening for a slide, opposite which there is a deflector with a deflecting surface, which runs at an angle to the longitudinal center plane of the housing. In the area of the deflector, a transporting lever, which can be moved transversely to the longitudinal center plane from a resting position to a working position, and which has a working surface that works together with the slide pusher, is mounted especially so that it can be swivelled. With the transporting lever in the resting position, the working surface protrudes into the path of the slide pusher. However, when the transporting lever is in the working position, the working surface is arranged outside of this path.

Abstract: A compact film viewer for film strips of various sizes including a removable channel guide with a central opening disposed transverse a case between a light source and a lens and a film channel interchangeably received in the channel guide for slidably receiving film strips. The film channel is sized for a particular film and has a central opening corresponding to film frame size to prevent passage of excess light from the light source to the lens when viewing the film.

Abstract: A slide viewer or projector is provided with a device for preventing two or more slides from attempting to enter into the viewing or projecting area simultaneously. The device comprises a barrier with a wiper pivotally mounted thereon. The barrier and wiper are spaced apart from the path taken by a slide so that the slide pivots the wiper against the action of biasing means and then the barrier is raised into engagement with the upper surface of the slide and this allows the wiper to wipe over the upper surface of the slide to "kick off" any other slide resting on the surface.

Abstract: A slide projector has a slide exchange element and a slider movable on the latter and having different widths suitable for magazines with different slide compartment widths, wherein the slider is engageable with the slide exchange element under the action of a spring in direction normal to the displacement direction of the slide exchange element, a magazine sensing element senses a magazine inertable into a respective magazine path and provides for disengagement of the slider from the slide exchange element, and an abutment slides in the displacement path of the slider in the disengaged position of the same.

Abstract: A diaprojector for framed diapositives accommodated in at least two different magazines has two tracks each for a respective one of the magazines having smaller and greater diapositive compartment widths, a drive for gradually transporting each of the magazines by a distance corresponding to the width of the diapositive compartments, a sliding element having a width suitable for exchanging the diapositives in one of the magazines, and a rider having a width suitable for exchanging of the diapositives in the other magazine and displaceable on the sliding element between two positions in which either the sliding element or the rider is available for acting upon the respective magazine, and a sensing device operative for blocking the operation of the projector, when the position of the rider does not correspond to the magazine in which the diapositives must be exchanged.

Abstract: An audio-visual, child-participating, educational entertainment center, which provides a child with an educational entertainment device in which the child can actively participate, at his own pace, in an audio-visual feature. The educational entertainment center comprises a screen upon which visual images are projected, an animated audio-visual feature, a kit containing different types of appliques, the appliques being capable of integration with the audio-visual animated feature, and a switch to stop and restart the audio-visual feature at will, thus permitting the child to apply the applique means at his own pace.

Abstract: A series of slides are placed in a vertical loader and are movable alternatively into respective ones of two projection positions. Each slide is moved laterally of the loader by a carriage, then pushed to the projection position by a push rod. During projection the following slide in the loader is similarly moved to the other projection position. After its projection, the first slide is brought back by a further push rod to its carriage and then is moved by the carriage to be deposited in a receptacle and be replaced by a new slide which will be moved into the same projection position.

Abstract: A slide projector having resilient flexible elements mounted on the projector to engage the edges of slides in magazine compartments next to the compartment from which a slide is to be withdrawn or to which a projected slide is to be returned, for shifting the slides in the adjacent compartments to upright positions flat against the partition walls of the magazine, so that they will not tilt to positions overlying the compartment from which a slide is to be withdrawn or to which it is to be returned, thus avoiding possible interference with the withdrawal or return.

Abstract: A slide projector having a supply station to accept slides from a vertical stack in a supply means, the projector having a slide separator device enabling single slide feed in a horizontal plane from an intermixed stack of thick and thin slides in the supply means.