| 摘要 |
<p>PROBLEM TO BE SOLVED: To realize a construction which facilitates assembly and enables size reduction. SOLUTION: A fixed ring 28 is supported by a case 2. A distance between a pressing ring 39 and a pressing sleeve 25 is made freely adjustable by a pressing screw 41 which is screwed on the fixed ring 28. Compression coil springs 30 are provided around guide rods 29 between the fixed ring 28 and the pressing sleeve 25, and between the pressing 39 and the pressing sleeve 25. An elastic force applied to the pressing sleeve 25 through the compression spring 30 is adjusted by the pressing screw 41.</p> |
