| 摘要 |
Photographic apparatus of the type including a film chamber for locating a film cassette in position for exposure of a film unit contained therein and apparatus for advancing the film unit, subsequent to exposure, away from the exposure position. A spring motor is connected to the apparatus by a power train for driving the latter. The spring motor is wound or energized by a belt having one end connected to and coiled around a shaft of the motor and a second end having a member attached thereto which is normally located in the path of travel that the film cassette takes during its insertion into the film chamber whereby during such insertion the film cassette engages and progressively moves the member on the belt thereby unwinding the belt while simultaneously winding the motor's spring. The energy thus stored in the spring motor is used to drive the apparatus after each exposure. The apparatus driven by the spring motor may take various forms, e.g., a film advancing structure or a pair of rollers for spreading a processing fluid across a photosensitive element of a film unit.
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