Abstract: An overhead projector transparency transport system uses a transparent platen 20 extending over projection window 11 and beyond both sides of projector 10. A transparent belt 80 made of a base web 84 and a pocket web 85, fused together to form a series of pockets, receives a sequence of transparencies 100, and transverse fold lines formed between pockets 81 allow belt 80 to fan fold. Pocket web 85 is fused to base web 84 at inturned edges 95 of an open side 96 of each pocket 81 to trap a transparency 100 within its pocket, once inserted. Platen 20 is positioned so that transparent belt 80 can advance across platen 20 from a fan-fold supply stack 82 next to projector 10 and proceed to an automatically formed take-up stack 83 next to the other side of projector 10.

Abstract: A microprocessor is utilized to monitor and control the operation of an image projector and a magnetic tape cassette player. Inaudible cueing tones recorded on the tape allow the recorded narrative to be kept in synchronization with the image projected. A sync counter within the microprocessor keeps track of the amount and direction by which the image and tape are out of synchronism. The microprocessor controls a visual indication to the operator that shows the direction in which the tape must be moved to regain synchronization. When the tape is moved forward to achieve synchronization, the microprocessor will stop the tape after the cue pulse that precedes the narrative for the associated image. When the tape is moved in the reverse direction to achieve synchronization, the microprocessor will stop the tape just beyond the cue pulse at the beginning of the desired narrative.

Abstract: Method for use with a visual image projector and an associated magnetic tape playback machine where the magnetic tape has both cue tone and audio program signals recorded thereon. The method quickly regains synchronization between the selected visual image and the associated audio program after the visual image projector has been changed with respect to the audio program, or the audio program has been changed with respect to the visual presentation.

Abstract: A filmstrip cartridge for use with a complimentary filmstrip projector includes a hood hinged to a film containing housing. The cartridge features spring means to maintain the film in a coiled state during winding and unwinding, a force biased closure means, a film guide channel defined between the hood and the housing having friction reducing means to insure reliable film movement, and an optional positive film movement lock to prevent inadvertant film removal.