Optics: motion pictures – Camera and/or projector drive mechanisms
Patent
1976-08-26
1979-04-24
Hayes, Monroe H.
Optics: motion pictures
Camera and/or projector drive mechanisms
352 14, 352173, 352180, 352221, 226184, G03B 100
Patent
active
041508866
ABSTRACT:
A projector for motion picture film includes a servo motor which is controlled to advance film frame by frame to a projection station. A capstan on each side of the projection station is controlled to maintain film loops of substantially constant size and an associated reel motor delivers film to and takes film from each capstan. Each associated capstan and reel motor are controlled so as to maintain substantially constant tension on the film. A film guide defines the projection station and also includes provision for masking peripheral areas of each frame. Each capstan and an associated pinch roller are designed so as to eliminate creeping of film from between the two. A circuit for controlling the reel motors is arranged to permit fast winding of film directly from one reel to the other with an automatic braking feature.
REFERENCES:
patent: 2015261 (1935-09-01), Eckler
patent: 3296923 (1967-01-01), Miles
patent: 3565521 (1971-02-01), Butler
patent: 3606526 (1971-09-01), Smith
patent: 3692394 (1972-09-01), Bauer
patent: 3730616 (1973-05-01), Fliesser
patent: 3819258 (1974-06-01), Butler
patent: 3841743 (1974-10-01), Thevenaz
patent: 3912383 (1975-10-01), Stutz
patent: 4014112 (1977-03-01), Christopherson
patent: 4022525 (1977-05-01), Boudouris
Merkel Stephen L.
Norton Barton F.
Small Charles B.
Airborne Mfg. Co.
Hayes Monroe H.
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