Patent
1980-11-18
1982-04-20
Griffin, Donald A.
354212, G03B 112, G03B 100
Patent
active
043256228
ABSTRACT:
Disclosed is a coupling for the connection of a drive motor to a still camera to facilitate automated cocking and actuation of the camera. The coupling has two major portions one of which rotates with a drive motor and the other of which rotates with the film transport advance drum. One of the portions will be a cam and the other portion a cam biassing device such that under low torque loads being transmitted from the drive motor to the film transport advance drum, the two portions rotate together. When the film has been wound, the film transport advance drum stops suddenly increasing the torque transmitted between the still moving motor and the transport advance drum. When the torque reaches a preset maximum amount, the cam biassing device slips relative to the cam and actually drives itself in a reverse direction. An additional apparatus is provided which free-wheels in the normal direction and couples movement in a reverse direction to a shutter release mechanism which insures that the picture is taken while the film transport advance drum is motionless. Specific embodiments showing the motor powering either the cam or the cam biassing device are disclosed.
REFERENCES:
patent: 1413187 (1922-04-01), Paumier
patent: 2782701 (1957-02-01), Helber
patent: 3659798 (1972-05-01), Mindler et al.
patent: 4190341 (1980-02-01), Sugimori
Griffin Donald A.
Rollei-Werke Franke & Heidecke GmbH & Co. KG
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