Film deceleration unit

Details Film deceleration unit Film deceleration unit

1990-10-30

1991-09-24

Hayes, Monroe H.

Optics: motion pictures

Camera and/or projector drive mechanisms

With continuous feed and intermittent film arresting means

352182, G03B 100

Patent

active

050509853

ABSTRACT:
A projector having a rolling loop film transport mechanism is provided with a film decelerating cam unit that is located in advance of the aperture of the projector. Deceleration pins carried by a pair of vertically spaced arms that project from the cam unit engage in upper and lower marginal perforations in the film and travel with the film towards the aperture and decelerate the film as each frame is advanced. The cam unit includes two cams, one of which causes the decelerating motion of the pins, and a return motion in the reverse direction, while the other cam causes the pins to advance and retract into and from the film path respectively. By positively retracting the pins, their return movement against the direction of film travel can take place independent of the motion of the film. As compared with the prior art, acceleration forces and resultant stresses on the cam are reduced and the cam unit can operate at higher frame rates and/or with smaller rotor gaps.

REFERENCES:
patent: 3600073 (1971-08-01), Shaw

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