Film-transport mechanism for motion-picture projectors, and the

Details Film-transport mechanism for motion-picture projectors, and the Film-transport mechanism for motion-picture projectors, and the

1977-12-02

1979-12-04

Knowles, Allen N.

Advancing material of indeterminate length

Selectively reversible material mover

By optional drive trains

226 65, 226 70, G03B 122

Patent

active

041767764

ABSTRACT:
A single rotary cam has one cam track which controls movement of the transport claw in both the forward and reverse film-transport directions. The cam track is so configured that the claw motion constituting the one-frame advancement motion for forward transport constitutes part of the return stroke during reverse transport, and vice versa. The cam-track configuration is such that, despite the constancy of the motion performed by the claw, the position of projected frames is unchanged when switching over between forward- and reverse-transport modes of operation.

REFERENCES:
patent: 3612370 (1971-10-01), Thevanaz
patent: 3640441 (1972-02-01), Keznickl

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