| 摘要 |
<p>PURPOSE:To precisely and rapidly position an X-ray camera device by providing a cam surface having a recessed surface and an inclined surface projecting from the recessed surface, and a rod which is pressed against the cam surface by an urging means, in a positioning means. CONSTITUTION:A positioning means 9 has a cam plate 19 incorporating a cam surface 11, and a rod 13 pressed by a spring member 12. The cam surface 11 has inclined surface 11a, 11b formed on the cam plate 19, and further has a cap-like recessed surface 11c and provided in the vicinily of the top, an steeply inclined surface 11d projected from the recessed surface 11c. The curvature of the recessed surface is slightly larger than that of a roller, and accordingly, the roller 15 can be easily engaged in the recessed surface 11c so as to enhance the accuracy of the positioning. Further, the roller 15 is mounted rotatably around the periphery of the rod 13, and is urged by the spring member 12 in the pressing direction E. With this arrangement, it is possible to precisely and rapidly attain the positioning.</p> |
