Out-of-frame detector for motion picture film duplicating equipm

Details Out-of-frame detector for motion picture film duplicating equipm Out-of-frame detector for motion picture film duplicating equipm

1978-06-21

1980-02-12

Griffin, Donald A.

Photocopying

Projection printing and copying cameras

Original moves continuously

G03B 2748

Patent

active

041881125

ABSTRACT:
A system is provided for a step optical printer to detect an out-of-frame condition in the printer projector and/or camera sections. The out-of-frame detector comprises a free wheeling encoder driven by film entering a gate of the printer and a second encoder driven by the printer drive mechanism. A comparator is connected to the outputs of the encoders to detect a lack of correspondence between the length of film entering the gate and the length of film being driven. Such lack of correspondence being indicative of an out-of-frame condition.

REFERENCES:
patent: 1933787 (1933-11-01), Capstaff
patent: 1969465 (1934-08-01), Jones
patent: 3040619 (1962-06-01), Oxberry
patent: 3414353 (1968-12-01), Schwardt
patent: 3768905 (1973-10-01), Williams
patent: 3881820 (1975-05-01), Muir
patent: 3902802 (1975-09-01), Murata et al.

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