Motorized film-transporting mechanism

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354218, G03B 118

Patent

active

042819113

ABSTRACT:
A motorized film-transporting mechanism for roll film cameras has a motor-circuit switch arranged in the path of movement of a film sensor so as to be closed when a film is present in the camera. A film counter is biased to zero position when the camera back is opened. When a film is present in the camera and the back is closed, the motor is automatically energized to advance the film by a length corresponding to two film frames so as to move this usually spoiled (light-blackened) film length out of the way. The motor is then automatically de-energized and all components are in readiness for subsequent picture-taking and incremental film advance by one film frame each. When all exposures have been made the film is rewound by the motor which shuts down when rewinding is completed.

REFERENCES:
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patent: 3135182 (1964-06-01), Hintze et al.
patent: 3169460 (1965-02-01), Winkler et al.
patent: 3925798 (1975-12-01), Sanada et al.
patent: 4149793 (1979-04-01), Date
patent: 4208120 (1980-06-01), Zachmeier et al.
patent: 4240734 (1980-12-01), Nomura et al.

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