Claw mechanism

Details Claw mechanism Claw mechanism

1975-09-04

1977-01-18

Hayes, Monroe H.

Optics: motion pictures

Camera and/or projector drive mechanisms

With film engaging claws reciprocally driven to engage film

226 62, 226 70, 226 71, G03B 122

Patent

active

040036472

ABSTRACT:
A claw mechanism for the transport of a film in a film projector. A claw arm is disposed parallel to the transport path and pivotable about an axis transverse to the direction of transport; a claw means is disposed substantially transverse to the transport path, pivotally connected to the free end of the claw arm about an axis transverse to the direction of transport; and a drive shaft disposed parallel to said two axes, which rotates continuously during operation, comprises a crank which engages a slot in the claw means. A cam follower, pivotally connected to the free end of the claw arm about an axis parallel to the direction of transport, is pressed against one of two cams on the drive shaft by spring force and is connected to the electromagnetic control means for engagement alternatively with a first cam for keeping the film perforations out of engagement with the claw means, or a second cam for intermittently advancing the film by one frame per revolution to control the movements of the claw arm and thus the speed of film transport.

REFERENCES:
patent: 3643842 (1972-02-01), Maaden
patent: 3671113 (1972-06-01), Johnson
patent: 3702730 (1972-11-01), Russell
patent: 3797924 (1974-03-01), Day

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