Mechanical drive arrangements

Details Mechanical drive arrangements Mechanical drive arrangements

1974-06-21

1976-03-30

Hayes, Monroe H.

Optics: motion pictures

Camera and/or projector drive mechanisms

With intermittently driven carrier-engaging sprocket

352164, 352190, G03B 124

Patent

active

039471012

ABSTRACT:
A mechanical drive arrangement for a cinematograph projector. A double-sided tooth drive belt passes, in succession, over a motor driven, film take-up sprocket, idler sprocket, intermittent drive sprocket, film feed sprocket and shutter drive sprocket. The intermittent drive sprocket and intermittent motion film sprocket are mounted on a rotatable disc. The axis of rotation of the disc coincides with the circumference of the intermittent drive sprocket at the point where the plane through the axes of both mounted sprockets cuts the region of engagement of the drive belt around that circumference. In consequence, rotation of the disc moves the film anchor point, on the intermittent motion film sprocket, with only slight rotation of the shutter drive. Thereby, ghosting is avoided when racking.

REFERENCES:
patent: 1418570 (1922-06-01), Horton
patent: 2257197 (1941-09-01), Serrurier
patent: 2478679 (1949-08-01), Bartelson

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