Sound movie projector

Details Sound movie projector Sound movie projector

1975-04-24

1978-08-08

Hayes, Monroe H.

Optics: motion pictures

With sound accompaniment

Picture and sound synchronizing

352 27, G03B 3102

Patent

active

041053060

ABSTRACT:
A sound movie projector includes, in a serial manner, a first sprocket, an intermittent film advance mechanism for advancing the film on a frame-by-frame basis past a projection gate, a sound recording and/or reproducing head assembly, a film drive roller assembly, and a second sprocket. The difference in film feeding speed at the projection gate and the sound reproducing station is detected by monitoring the length of the film disposed between the film drive roller assembly and the second sprocket by means of a pivotable sensing lever operatively engaged with a portion of the film having a substantially rectiliner configuration under normal conditions, and as a result of such monitoring, the film feeding speed at the film projection gate is appropriately adjusted in a continuous manner utilizing a cone pulley drive system.

REFERENCES:
patent: 2190658 (1940-02-01), Githens
patent: 2243112 (1941-05-01), Morrissey
patent: 2676023 (1954-04-01), Isom
patent: 3244469 (1966-04-01), Hennessey
patent: 3597056 (1971-08-01), Sasaki

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