| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor-driven chuck device enabling the amount of deformation of a workpiece to be known precisely when the workpiece is held. SOLUTION: This motor-driven chuck device is used to hold the workpiece by opening/closing chuck jaws 6 by using a motor 1. This device is equipped with a torque detector for detecting the torque of the motor 1, a movement amount detector for detecting the amount of movement of the jaws 6, and a computing device 12 for computing the amount of deformation of the workpiece from a change in torque of the motor 1 and the amount of movement of the jaws 6, The movement amount detector is provided with a non-contact type position sensor 9.
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