Damper for motion picture film in cinematographic apparatus

Details Damper for motion picture film in cinematographic apparatus Damper for motion picture film in cinematographic apparatus

1975-08-13

1976-08-31

Hayes, Monroe H.

Optics: motion pictures

With loop forming

226114, 226195, G03B 156

Patent

active

039777758

ABSTRACT:
An elastic damper which engages the film between the supply reel and the film gate of a motion picture projector has an elongated first leg which loops the film and is pivotable with respect to a second leg which is reciprocable between bridges and is biased forwardly so as to urge the first leg against the film. When the tension of film fluctuates within a normal range, such as is attributable to intermittent operation of the pull-down, the first leg merely pivots while the second leg remains stationary. If the tension of film increases so that the pivotal movement of the first leg is more pronounced, the second leg is shifted against spring bias to effect a reduction of the size of the loop. This insures that the inclination of the film portion between the gate and the first leg remains substantially unchanged.

REFERENCES:
patent: 1282437 (1918-10-01), Krug
patent: 3870406 (1975-03-01), Nebbia

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