| 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:A spool shaft 28 is pushed by a spring 39 and the pressure of a cylinder 33 produced by the pressure oil fed through an oil supply port 44' thereby a roller 37 arranged at that position contacts continuously against a cam 24. A sprocket coupled to the cam 24 decelerates gradually according to the profile of the cam 24 and fitted in a positioning groove 26 made in the cam 24, thus being positioned and indexed. When pressure oil is drained through the oil supply port 44' of the cylinder 33 and fed to an oil supply port 44, the roll 27 of spool shaft 28 is disengaged from the positioning groove 26 of the cam 24. When they are disengaged, holes made with uniform interval on a same diameter line of the sprocket are detected through a sensor and counted so as to detect the hole immediately before the stopping position thus detecting the deceleration starting position. |
