| 摘要 |
An X-ray film cassette holder 10 including a clamping mechanism for centering a film cassette C therein as the holder is inserted into an associated X-ray machine, and also including a position measuring device 184 for sensing the dimensions of the film cassette. The clamping mechanism has two positioning assemblies 34 and 36 that act to position the film cassette C in two orthogonal directions and an actuator mechanism 148 that links the positioning operation to the insertion movement, all mounted on a tray 12 that is adapted for insertion into the X-ray machine. The two positioning assemblies 34 and 36 include parallel clamps 44 and 46 and 52 and 54 attached to slides 102 and 106 and 122 and 136 of double slider-crank mechanism 86 and 88 so that the clamps move in opposite directions as the crank 92 and 110 rotate about a pivot 90 in the center of the tray 12. One of the cranks 92 is spring biased, while the other crank 110 is releasably coupled to the actuator mechanism 148 by a pawl 168 to limit insertion and withdrawal forces.
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