Optics: motion pictures – Camera and/or projector drive mechanisms – With film engaging claws reciprocally driven to engage film
Patent
1974-02-08
1976-01-27
Hayes, Monroe H.
Optics: motion pictures
Camera and/or projector drive mechanisms
With film engaging claws reciprocally driven to engage film
226 62, G03B 122
Patent
active
039349624
ABSTRACT:
A film transport has an intermittent drive mechanism with a claw for engaging sprocket holes in a film. The claw is driven by the mechanism to pull the film down frame by frame. Two or more cams are used to cause the claw to carry out a four-sided motion with a fast pull-down action. One of the cams or an additional cam may be provided to render the claw operative to effect pull-down at alternately long and short dwell intervals proportioned to allow scanning of a film frame by different numbers of complete television fields.
REFERENCES:
patent: 2173230 (1939-09-01), Kellogg
patent: 2612816 (1952-10-01), Thevenaz
Angel Jonathan George Cordy
Blakemore Bernard
Halliday Anthony James
Taylor John Thurston
Colourvision Associates
Hayes Monroe H.
O'Connell Robert F.
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