| 摘要 |
A photographic film cassette comprising a housing with a hinged lid thrusts film therefrom during the film threading process. The cassette comprises a rotatable film spool concentrically positioned in a housing, within and adjacent to a rotatable, outwardly convex panel member having end plates with camming structure thereon. Corresponding cam followers are located on the interior of the lid, and when the panel member is rotated by a drive spindle accessible to the member through an opening in an end of the housing, the member rotates, camming the lid onto an open position. Film engaged to the member's outer surface by a detent projecting from the surface through a perforation in the film is thrust out of the cassette into engagement with the camera's film transport mechanism. During rewinding, a drive spindle accessible to the spool through the housing's end opening rewinds the film until the perforation is sensed by camera sensing means. The housing lid is then partially closed, bringing shoulders on the lid's interior into contact with the film and forcing the perforation back onto the detent. Continued rewinding of the last of the film results in further camming of the followers caused by movement of the film, closing the lid.
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