Film feeding device for sound motion picture camera

Optics: motion pictures – With sound accompaniment – Common picture and sound record carrier systems

Patent

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Details

352 29, 352 72, 352174, G03B 3102

Patent

active

041508815

ABSTRACT:
In a sound recording portion of a sound motion picture camera, a film strip is continuously advanced by a capstan and a pinch roller. The pinch roller is movable between its retracted position where it is spaced apart from the capstan and its operative position where it is pressed against the capstan to pinch the film strip therebetween. The pinch roller is supported on a pivotable member which is capable of pivoting from a first position in which it holds the pinch roller in the retracted position to a second position in which it holds the pinch roller in the operative position. The pivotable member is moved between the two positions driven by a reciprocating plate member which is moved back and forth in translational movement by an electric motor through a cam mechanism. The electric motor is energized in response to depression of the shutter button of the camera and deenergized when the pivotable member is pivoted to its second position. The electric motor is again energized when the shutter button is set free and kept energized until the reciprocating plate member is returned to its initial position where the pivotable member is positioned in its first position.

REFERENCES:
patent: 4052125 (1977-10-01), Ishibashi
patent: 4059349 (1977-11-01), Komine et al.

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