Patent
1981-05-18
1982-06-15
Griffin, Donald
354212, G03B 1700, G03B 100
Patent
active
043347533
ABSTRACT:
A unitary, movable lever permits a photographic camera to be test operated in the absence of film and, when the camera is loaded with film, permits an exposure to be initiated only if the film has been properly threaded and advanced. With no film in the camera, the lever is urged to a first position which permits actuation of the shutter. When the camera is initially loaded with film, a sensing pin engages an edge of a laterally trimmed film leader and moves the lever to a second position in which it blocks actuation of the shutter and provides a visual indication of the blockage in the camera viewfinder. If the film is properly attached to the take-up spool and advanced a sufficient distance, a widening portion of the leader, adjacent the full-width of the light sensitive film portion moves past the sensing pin. The sensing pin is moved by the widening leader thereby causing the lever to move to a third position in which it again permits actuation of the shutter.
REFERENCES:
patent: 1389164 (1921-08-01), Roikjer
patent: 2766669 (1956-10-01), Weisse et al.
patent: 4104664 (1978-08-01), Winkler et al.
patent: 4134657 (1979-01-01), Nomura
patent: 4176927 (1979-12-01), Wagensonner
Eastman Kodak Company
Griffin Donald
Hague Douglas I.
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