| 摘要 |
A photographic film cassette which has not been exposed has its film leader completely housed within the cassette. When a film is rewound after taking photographs, a stop hole in the film is engaged with a stop claw formed on a film passage mouth, so that the film rewinding operation is intercepted, with the film leader being slightly protruded from the cassette shell. A film removing slit is formed in a film feeding slit of a cassette holder of a camera. Therefore, when pulling out the film cassette in the axial direction, the film leader protruded from the cassette is bent and passed through the slit. If an exposed film cassette is attempted to be loaded, the loaded operation is intercepted because the open end of the film removing slit is positioned different from the film feeding slit in the vertical direction. When the cassette holder takes a closed position, an operation pin registers at a first lock section so that the cassette holder is locked at the closed position where the cassette holder enters the camera body. As a coupling member is moved, the cassette holder moves from the closed position to the open position by the force of a biasing member. At this time, the operation pin moves through a first guide section from the first lock section to a second lock section, so that the cassette holder is locked at the open position where the cassette holder protrudes out of the camera body.
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