1977-11-15
1980-02-26
Gellner, Michael L.
354212, G03B 118
Patent
active
041903412
ABSTRACT:
A motor drive device for a camera comprises a film advance shaft for advancing film with the aid of the drive from a motor. A rotary shaft has a connecting portion and is effective to transmit the rotation to the film advance shaft, and a drive plate is rotatably mounted on the rotary shaft and is rotatable by the drive motor. A movable plate is rotatably mounted on the rotary shaft, a bias member biases both the movable plate and the drive plate so as to rotate them together and a coupling member formed with a coupling portion is capable of being coupled to the connecting portion, the coupling member being pivotally mounted on the movable plate for displacement between a coupled position and a non-coupled position. Change-over means are arranged for changing over the coupling member from the non-coupled position to the coupled position when the change-over means lies in the orbit of the coupling member, and a release is provided on the drive plate so as to pivotally move the coupling member to the non-coupled position against the bias of the bias member when the coupling member is in the coupled position by the displacement of the relative position between the drive plate and the movable plate which results from an increased film advance load after completion of film advance.
REFERENCES:
patent: 3946409 (1976-03-01), Toyoda
Gellner Michael L.
Nippon Kogaku K.K.
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