Intermittent rotary motion device

Details Intermittent rotary motion device Intermittent rotary motion device

1975-01-09

1977-03-01

Stephan, Steven L.

Optics: image projectors

Slide transfer mechanism

Slides fixed to movable carrier

353DIG2, G03B 2308

Patent

active

040099520

ABSTRACT:
A film strip projector which is provided with synchronized audio accompaniment. A film strip is framed with respect to a projection aperture by a selectively operable framing device. Once the film strip is initially framed, the film strip is advanced frame by frame by a Geneva type film advance mechanism. The audio accompaniment is carried on a dual track audio tape, one track of which carries the audio message pertinent to a particular frame and the other track of which carries a control signal for the film drive mechanism. The Geneva type film drive mechanism comprises a pair of cooperating gears the second of which rotates only 90.degree. for every 180.degree. rotation of the first gear. The first gear automatically deenergizes the drive motor after rotation of approximately 180.degree..

REFERENCES:
patent: 771828 (1904-10-01), Mead et al.
patent: 1617642 (1927-02-01), Knott
patent: 2425704 (1947-08-01), Nemeth
patent: 2655075 (1953-10-01), Lightburn et al.
patent: 3632200 (1972-01-01), Frey

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