Intermittent movement with tandem cams

Details Intermittent movement with tandem cams Intermittent movement with tandem cams

1976-03-05

1977-04-12

Hayes, Monroe H.

Optics: motion pictures

Camera and/or projector drive mechanisms

With film engaging claws reciprocally driven to engage film

226 62, 226 67, G03B 122

Patent

active

040171671

ABSTRACT:
In the present cam-driven intermittent movement for motion picture machines the pull-down action is shared by a plurality of cams mounted on a common shaft and operating in tandem, thereby reducing the noise and vibration and/or permitting faster pulldown. One cam drives a claw arm in its swinging movement about a pivot, while the other cam drives a carrier arm which is pivoted at one end on the machine frame and carries at its other end the claw arm pivot. Meshing action of the claw may be controlled by cam action applied to either arm. Such action may be derived from the same cam as the pull-down action, or may employ an auxiliary meshing cam.

REFERENCES:
patent: 2144277 (1939-01-01), Wall

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