Intermittent prime film mover using multi-toothed wheel drive

Details Intermittent prime film mover using multi-toothed wheel drive Intermittent prime film mover using multi-toothed wheel drive

1979-03-22

1980-08-05

Hayes, Monroe H.

Optics: motion pictures

Camera and/or projector drive mechanisms

With intermittently driven carrier-engaging sprocket

352180, G03B 124

Patent

active

042159210

ABSTRACT:
An improved intermittent drive for a motion picture film projector having a film gate, condenser lens, light source and shutter means is provided by a relatively large sprocket wheel having forty sprocket teeth with 12 to 14 teeth engaging the film at the sprocket holes. This sprocket wheel is driven by a servo motor capable of rapid start and stop and high-speed motion under electronic control. The sprocket wheel supports the film between the film gate aperture (light gate) and the condenser lens. The sprocket wheel is of sufficiently large diameter so as to provide a circumferential curvature that does not appreciably change the vertical plane of a single frame of film thereon.

REFERENCES:
patent: 1299469 (1919-04-01), Holmes
patent: 1490279 (1924-04-01), Kucharski
patent: 1888094 (1932-11-01), Ranieri
patent: 3565521 (1971-02-01), Butler et al.
patent: 3606526 (1971-09-01), Smith et al.
patent: 3819258 (1974-06-01), Butler et al.
patent: 3912383 (1975-10-01), Stutz
patent: 4022525 (1977-05-01), Boudouris
patent: 4149781 (1979-04-01), Everett
patent: 4150886 (1979-04-01), Merkel et al.

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