Film loop forming device

Details Film loop forming device Film loop forming device

1978-07-03

1979-07-03

Hayes, Monroe H.

Optics: motion pictures

With sound accompaniment

Picture and sound synchronizing

352 12, 352 27, 226 44, G03B 3100

Patent

active

041598687

ABSTRACT:
A film loop size control is described for use in a camera in which the film s advanced intermittently past an image recording station by a first drive means and advanced continuously past a sound recording station by a second drive means. A detector which senses the size of the film loop between the image recording station and the sound recording station causes a control means to actuate only the second drive means whenever the detector senses a slack film loop when the film is stationary. The second drive means then advances the film past the sound recording station to remove the slack from the film loop. When the detector senses an absence of slack in the film, the control means de-actuates the second drive means. A switch is included which is adapted to be actuated when the film slack has been reduced for actuating both the first and the second drive means for advancing the film past the image recording station and the sound recording station.

REFERENCES:
patent: 3942882 (1976-03-01), Saito
patent: 3982826 (1976-09-01), Saito

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