Device for driving the claw shaft of a motion picture camera

Details Device for driving the claw shaft of a motion picture camera Device for driving the claw shaft of a motion picture camera

1979-02-23

1980-11-25

Hayes, Monroe H.

Optics: motion pictures

Camera and/or projector drive mechanisms

With film engaging claws reciprocally driven to engage film

352180, 352192, G03B 122

Patent

active

042355346

ABSTRACT:
A device for driving the claw shaft of a motion picture camera, comprises an electric motor coupled to the claw shaft itself connected to said claw by a mechanism of the crank-connecting rod system type, for converting the movement of rotation of the electric motor into a movement of reciprocating translation.
Means are provided for modulating the speed of rotation of the claw shaft as a function of the angle of rotation thereof with respect to a reference position, so that the speed of the claw at the moment of its engagement in a perforation of the film is as low as possible and that this speed then increases, during the descent of the film, according to a law such that the acceleration communicated to the film causes only a minimum stress exerted on said latter.

REFERENCES:
patent: 2406152 (1946-08-01), Levine
patent: 3692394 (1972-09-01), Bauer
patent: 3819258 (1974-06-01), Butler et al.
patent: 4022525 (1977-05-01), Boudouris

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