Motor driven film wind-up and rewind device for cameras

Details Motor driven film wind-up and rewind device for cameras Motor driven film wind-up and rewind device for cameras

1982-05-24

1983-12-06

Perkey, William B.

354214, G03B 118

Patent

active

044190018

ABSTRACT:
A motor driven film wind-up and rewind device for cameras is automatically switched from a film wind-up mode to a film rewind mode when the entire length of an unexposed film has been wound on a film take-up spool and surely remains in the film rewind mode thereafter. For the automatic switching of the modes a circuit detects increase in a motor current which occurs with a motor forced to stop after completion of the film wind-up. A movable member which is in the form of an through axle extending through a film rewinding sprocket moves from a first position to a second position immediately after initiation of the motor rotation for the film rewind, switching a switch to a state maintaining the device in the film rewind mode as well as connecting the sprocket with the motor. The movable member is returned to the first position in response to insertion of a film cartridge into a cartridge chamber of the camera and restrained at the first position till the initiation of the film rewind. With no cartridge inserted in the cartridge chamber the movable member is not returned to the first position so that the device remains in the film rewind mode allowing a camera exposure operation.

REFERENCES:
patent: 2728281 (1955-12-01), Mihalyi
patent: 3946409 (1976-03-01), Toyoda
patent: 3999197 (1976-12-01), Iwashita et al.
patent: 4229091 (1980-10-01), Date et al.
patent: 4251148 (1981-02-01), Stemme et al.
patent: 4342509 (1982-08-01), Wakabayashi et al.

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