Abstract: A display apparatus includes a chassis frame and a housing. The housing defines a storage compartment with an inlet and an outlet for storing a plurality of display envelopes in a substantially parallel configuration. Two endless drive belts are located over corresponding pairs of roller spaced away from each other at opposing ends of the chassis frame. The endless belts each have a silicon-coated bearings face and a corresponding undulating wave spring secured to the chassis frame for urging the bearing faces of the drive belt against the surface of a display envelope while located in the presentation area. The drive belts are operable to draw the display envelope along a predetermined trajectory through the presentation area and into the inlet of the storage compartment.

Abstract: A signboard device includes a base having two chambers formed in the upper portion for slidably receiving a number of signboard holders. A driving member is disposed around the chambers of the base, and a spring-biased pusher is secured on the driving member and engaged with the signboards to move the signboards and the holders from one chamber to the other. A fence is disposed beside the chamber for engaging with and for urging the pusher to engage with the signboards or the holders. An eccentric stop is disposed for preventing the holders from moving backward.

Abstract: Device for the sequential display of images broken up in the form of groups of strips comprising a drive motor and means for cyclically displaying a succession of images. The strips are mounted on movable pallets (4, 57), independent of each other; the pallets (4, 57) are regrouped together according to the relative position of the strip which they carry in the reconstituted image, each group of pallets (4, 57) is guided so that each pallet (4, 57) remains independent of the others, and is guided along a looped track (9, 41).

Abstract: A slide magazine insertable in a side opening in a slide projector and comprising a plastic body with a continuous rail having two elongated sidewalls and two arcuate endwalls, and a cross-plate giving the body an H-shaped transverse cross-section. A grooved drive shaft is rotatably mounted within one arcuate endwall, and a plurality of plastic slide holders are slidably mounted on the rail, each having a dovetail-like notch in its inner side receiving the rail, two detent fingers extending toward each other on the inner side of the rail, and a slotted slide-holding frame on the outer side. The magazine body is divided into relatively movable end sections that are urged together by a spring for pressing the stack of holders toward the shaft, and the track is shaped to tilt the holders toward the shaft for positive pick-up of the detent fingers by the grooves in the shaft, to feed the holders around the rail, the grooves and the fingers having mating V-shaped cross-sections.