| 摘要 |
PURPOSE:To decrease the number of component parts and to facilitate an easy assembly, by using a coupling plate having a monolithic structure of polymer materials to connect a supporting member which moves up and down an arm and an operation means. CONSTITUTION:A coupling plate 9 having a monolithic structure of polymer materials contains a pair of coupling bars 9a and 9b, a detaining bar 9c which detains a coil spring 8 and a cylindrical rib 9d. The bar 9b which is set under a projection 4a of a cam 4 has a rather small thickness. An end of a revolving shaft 6b of a speed control parts 6 is pressed into the center of the rib 9d of the plate 9. Then the plate 9 is slowly turned at a fixed speed owing to the resistance of viscosity of the viscious oil applied around the shaft 6b. The spring 8 is extended and contracted with a switching action of a queuing lever. Thus the plate 9 is turned, and accordingly the cam 4 moves up and down. As a result, a pickup arm is moved up and down. |
