| 摘要 |
PURPOSE:To simplify the structure, by controlling the flow for a sprocket driving motor through rotary motion of a cam arranged on a sprocket at the driving side of a tool carrying chain then fitting the positioning groove of the cam and a spool shaft and positioning. CONSTITUTION:During stoppage of a chain, a spool 28 is loaded to the right by means of a spring 39 and a roller 27 is fitted in a positioning groove 26 of a cam 24. Then pressure oil is fed to the oil supply port 44 side of a cylinder 33 so as to move the spool shaft 28 to the left while resisting against the force of the spring 38 thus separating the roller 27 from the groove 26. Furthermore, a solenoid changeover valve 45 is switched to (a) side so as to rotate a hydraulic motor 10. Consequently, the cam 24 rotates together with the output shaft 20 of the motor 10 so as to drain pressure oil from the cylinder 33 thus moving the spool shaft 28 to the right and bringing the roller 27 into contact with the cam 24. As a result, the roller 27 follows the motion of the cam 24 and the motor 10 is decelerated as the spool shaft 28 is slided by a V-groove 49 and the roller 27 is finally fitted in the groove 26 and positioned. |
