Frame positioning apparatus

Details Frame positioning apparatus Frame positioning apparatus

1977-09-30

1980-02-05

Hayes, Monroe H.

Optics: motion pictures

With framing and/or travel ghost elimination

By relative positioning of gate and drive

G03B 2146

Patent

active

041870107

ABSTRACT:
An apparatus for centering each film frame within a film gate of a motion picture projector. An intermittant film pull-down mechanism is mounted on a plate which is pivotally attached to the motion picture projector body so that as the plate pivots the position of the pull-down mechanism relative to the film gate changes, thereby changing each picture frame edge respective to the film gate. A specific embodiment defines a belt driven pull-down mechanism with a drive pulley located off the plate and utilizes a rack and pinion gear as a means for pivoting the plate.

REFERENCES:
patent: 1027135 (1912-05-01), Leroy
patent: 1283595 (1918-11-01), Taylor
patent: 1293128 (1919-02-01), Larsen et al.
patent: 1335749 (1920-04-01), Parkes
patent: 1351814 (1920-09-01), Uhlemann

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