| 摘要 |
PURPOSE:To enables stepless adjustment of the holding strength of a chuck by screwing a screw nut round the periphery of a hollow/cylindrical traction shaft and arranging an output shaft and the traction shaft so that the shaft lines may differ with each other and laying a driving force transmission mechanism between and further providing a means for measuring the displacement in the shaft direction. CONSTITUTION:The revolution number of an induction motor 11 is detected by an optical rotation detector 12. Besides, a spiral gear 17 is engaged with a large gear 15 which is decelerated. And a screw nut 25 supports the shaft of the spiral gear 17 and engages with claw clutch hubs 20, 21. Further, the spiral gear 17 is provided with ratchets 17a, 17a,... and claws 20a, 21a and the casing 35 is mounted with a photoelectric proximity sensor 40 for measuring the displacement of the screw nut 25. By the above constitution, it is made possible to adjust the output torque of the induction motor 11 steplessly while detecting the holding strength by the output signal from the displacement detection means.
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