Film threading assembly for a motion picture film projector

Details Film threading assembly for a motion picture film projector Film threading assembly for a motion picture film projector

1978-10-02

1979-09-25

Hayes, Monroe H.

Optics: motion pictures

With threading structure

G03B 156

Patent

active

041688864

ABSTRACT:
For motion picture film projectors generally of the type having a projection slot on the housing thereof, the improvement comprising an inwardly sloped dynamic frusto-conical film guide surface on the film guide roller, the frusto-conical film guide surface having an axis of rotation congruent with that of the film guide roller and disposed at the free end thereof and sloping toward the journaled end thereof to form an inwardly sloped dynamic film guide surface; and an outwardly sloped dynamic frusto-conical film guide surface disposed on each film threading roller, each such outwardly sloped dynamic frusto-conical film guide surface being disposed to slope away from the journaled end of the film threading roller, whereby upon introduction of the film onto the outwardly sloped dynamic frusto-conical film threading surface, the film will tend to climb the surface in a direction toward the journaled end of the film threading roller to bias the film into the projection slot and to maintain the film therein during projection.

REFERENCES:
patent: 4037949 (1977-07-01), Pasturczak
patent: 4087165 (1978-05-01), Pasturczak

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