| 摘要 |
A photographic camera is intended for use with a film cassette, wherein rotation of a cassette film spool in an unwinding direction thrusts a film leader from the cassette interior to a film take-up drum of the camera and rotation of the spool in a rewinding direction draws the leader back into the cassette interior. The film transport apparatus of the camera includes a bi-directional drive member having respective positions for effecting alternate one-way driving connections with the cassette spool to rotate the spool in the unwinding and rewinding directions in accordance with the rotational direction of a single bi-directional drive motor. During advance of the film leader from the film cassette to the take-up drum, the drum is motor-driven at a faster speed than the cassette spool is rotated. When the film leader is secured to the take-up drum, the drive member permits the cassette spool to be overdriven by the resulting pull of the filmstrip exerted at the spool. During rewinding of the filmstrip onto the cassette spool, the take-up drum is uncoupled from the drive motor to allow the cassette spool to serve as the only means for film movement.
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