| 摘要 |
A film strip carried in a multipurpose film cassette is provided with a conformation thereon which cooperates with structure carried by a processor disabling valve which may be slidably advanced, when engaged by the conformation, upon film advancement. The conformation comprises an aperture provided in the central region of the film strip which is adapted to engage a film strip engaging finger provided on the slide valve. The film strip engaging finger is disposed in a region between a pair of spaced film guiding fingers which engage only the outermost edges of the film strip. The spaced film guiding fingers and other structure in the cassette cooperate to guide the film strip in a curved S-shaped path during normal film advancement thereby. The film strip is further provided with a pair of elongated longitudinally extending slots on opposing sides of the centrally disposed slide valve engaging aperture. Under normal conditions, the film strip, as it passes in the curved path follows a path defined by the fingers and thereby does not engage the centrally disposed film engaging finger. As the portion of the film strip having the elongated slots therein passes into the region of the slide valve, the outer edges of the film strip continue to be guided in the curved path by the guide fingers; however, the inner portion of the film strip containing the slide valve engaging aperture bows outwardly following a substantially straight path thereby causing the aperture in the central portion of the film to pass between the two guide fingers wherein it positively engages the third finger thereby effecting displacement of the valve as the film strip advancement continues.
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