Photocopying – Projection printing and copying cameras – Identifying – composing – or selecting
Patent
1976-01-26
1977-05-03
Griffin, Donald A.
Photocopying
Projection printing and copying cameras
Identifying, composing, or selecting
G03B 2752
Patent
active
040211142
ABSTRACT:
A film strip controller for exposed and developed photographic roll film adopted to be used with a photographic printing apparatus employing a roll film strip transport drive using slip clutches, includes a magnetic brake assembly responsive to signals generated as a result of varying light intensity incident upon a plurality of photosensitive detectors. The brake assembly stops the roll film being transported through the controller with each negative image on the film strip in proper registration and locates the negative in the proper plane so the shutter of the associated photographic printing apparatus can be operated to expose a positive print of the negative. Operation of the shutter may release the brake of the controller allowing the film to continue to move through the film strip controller until stopped by the brake means for the next negative. Logic circuits associated with the brake assembly and the photosensitive detectors insure proper control by rejecting spurious signals caused by irregularities sensed on the film strip.
REFERENCES:
patent: 3169441 (1965-02-01), Johnson
patent: 3537790 (1970-11-01), Ferguson
patent: 3549254 (1970-12-01), Muir
patent: 3600089 (1971-08-01), Walter
patent: 3752578 (1973-08-01), Allan
patent: 3768905 (1973-10-01), Williams
Griffin Donald A.
Lure Camera Ltd.
Strabala Joseph L.
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