Device for driving the claw shaft of a motion picture camera
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United States of America Patent
Stats
-
Nov 25, 1980
Grant Date -
N/A
app pub date -
Feb 23, 1979
filing date -
Feb 23, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Cited Art Landscape
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