Optics: motion pictures – With film treating or working
Patent
1977-01-03
1978-10-03
Adams, Russell E.
Optics: motion pictures
With film treating or working
352166, 352176, G03C 1100
Patent
active
041187377
ABSTRACT:
A programmable viewing system for processing and viewing cassette contained photographic film strips including a chassis defined by a centrally disposed vertical plate-like casting on which all internal viewer components cooperable mechanically and/or optically with the cassette are mounted together with a cassette well by which the cassette may be registered with such viewer components. A programming cam disc is rotatably carried by the casting for controlling both electrical switches for controlling an electronics logic system as well as shiftable viewer component positioning members, one on each side of the casting. The programming cam disc further controls cassette ejection. The spools of the cassette are driven by an electric motor through a clutch. A circuit is provided to sense when the motor current has risen to a level indicating that the clutch is slipping and to automatically advance the program cam disc to its next position after the current rise has indicated that the clutch has been slipping for about 11/2 seconds.
REFERENCES:
patent: 3851958 (1974-12-01), Land
patent: 3879116 (1975-04-01), Land
patent: 3941465 (1976-03-01), Figge et al.
Chambers Melvin T.
Hardy Herbert L.
Adams Russell E.
Goettel, Jr. Frederick A.
Polaroid Corporation
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