Film buffer for motion picture projectors

Details Film buffer for motion picture projectors Film buffer for motion picture projectors

1977-03-23

1979-10-02

Hayes, Monroe H.

Optics: motion pictures

With loop forming

226 44, 242 753, G03B 156

Patent

active

041696670

ABSTRACT:
A film buffer for motion picture projectors is provided to permit the smooth advancement of the film through a projection gate, and to serve as a shock absorber to insure even projection. The buffer comprises a pair of rollers in fixed relation to each other juxtaposed to form a loop in the film in its path of travel, from a film supply reel to a film transport mechanism for incrementally advancing each frame of the film past the projection gate, a bracket for holding said rollers pivotally mounted on the face of the projector at a mid-point between the two rollers to permit swinging movement to increase or decrease the film loop size depending upon the tension of the film, a counterweight fixedly connected to the bracket to pivotally bias the same into a position to increase the film loop size, and a torsion spring positioned beneath the counterweight to engage and cushion the same as it moves toward a rest position. When the tension of the film varies only as a result of the intermittent operation of the film transport mechanism, the film loop tightens and loosens around the rollers and thereby employs the inherent elasticity of the film to urge the film from the supply reel in a smooth and uninterrupted manner. If the tension of the film increases due to a jam in the supply reel or the like, the inertia of the counterweight will be overcome allowing the bracket to swing into a position to reduce the loop size.

REFERENCES:
patent: 2067755 (1937-01-01), Dyer
patent: 2578123 (1951-12-01), Bendfelt
patent: 2685417 (1954-08-01), Bartelson
patent: 2838304 (1958-06-01), Berkenhoff
patent: 3081683 (1963-03-01), Horton
patent: 3942883 (1976-03-01), Osborn et al.
patent: 3977775 (1976-08-01), Riedel

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