| 摘要 |
PURPOSE:To enable the characteristic change in a load detector provided at the support head side to be automatically checked by providing a means for checking the characteristic change in a load sensor from the relationship between a displacement amount and the output of the load sensor. CONSTITUTION:A support head 10 to which various types of operative heads 11 can be selectively attached is supportably guided vertically to a cross slide rest 14 by a pair of pilot bars 13a, 13b. Next, a position detector for detecting the rotational amount of a rotary shaft is provided to generate positive or negative pulses in response to the direction of displacement every time an operational section of the operative head 11 such as clamp claw is displaced by a certain distance. The pulse generated from the position detector is supplied to a position detecting counter 45 in a numerical control unit 60 to be accumulated for detecting a position of the operational section of the head 11. Thus, the characteristic change in the load detector can be automatically checked. |
