| 摘要 |
A film sheet cassette useful in medical X-ray applications and particularly in daylight film handling systems which include a dispenser for dispensing film sheets one at a time into the cassette. In use, the loaded cassette is first exposed to an X-ray source to photograph a patient after which it may be positioned in operative relationship with respect to a film processor for releasing the exposed film sheet into the processor. The cassette is comprised of a housing including a back plate and a dover plate fixed thereto in parallel spaced relationship. The back plate is provided with a raised elongated rib in the center thereof and strips of compressible material affixed to the back plate adjacent to its side edges. Disposed between the back plate and cover plate are a flexible back screen plate adjacent to the back plate and a flexible pressure screen plate adjacent to the cover plate. The cassette housing defines channels along opposite edges thereof for receiving spring urged cam rods slidable between a first closed position and a second open position. The pressure screen plate is provided with follower studs along the edges thereof which ride on cam surfaces of the rods. Actuating pins are provided on both the dispenser and processor for protruding into the channels when the cassette is positioned in operative light tight relationship with respect thereto. The pins engage the cam rods to slide them within the channels from said first to said second position thus causing the cam surfaces to lift the follower studs and space the pressure screen plate from the back screen plate to thus allow film sheets to enter or exit from the cassette. Withdrawal of the pins permits the cam rods to return to the first position thus forcing the studs toward the back plate and bowing both screen plates about the back plate rib to thereby assure excellent film/screen contact.
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