Movie camera sprocket drive mechanism

Details Movie camera sprocket drive mechanism Movie camera sprocket drive mechanism

1981-08-24

1983-12-20

Hayes, Monroe H.

Optics: motion pictures

With loop forming

352166, G03B 156

Patent

active

044213956

ABSTRACT:
A sprocket drive mechanism for transporting film through a motion picture camera includes a frame and a sprocket wheel rotatably supported on the frame and adapted to engage the film. A drive plate is rotatably supported on the frame which is rotated by a drive mechanism. A knob is coupled to the sprocket wheel for rotation therewith. A coupling plate is rotatably supported on the frame and is axially coupled to the knob for selectively rotating the knob. The knob, where manually actuated, axially displaces the coupling plate between a first position where the coupling plate is engaged with the drive plate for rotation therewith and a second position where the coupling plate is disengaged from the drive plate. The coupling plate, when in the first position, rotates the knob which in turn rotates the sprocket wheel. The knob, when the coupling plate is in the second position, is manually rotatable to permit manual rotation of the sprocket wheel to adjust the film.

REFERENCES:
patent: 1097483 (1914-05-01), Triplett
patent: 1247786 (1917-11-01), Blair
patent: 1271623 (1918-07-01), Segel
patent: 1319847 (1919-10-01), Cameron
patent: 2474972 (1949-07-01), Coutant et al.

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