| 摘要 |
PURPOSE:To enable a numerical control screw driving mchine to drive a screw into a screw hole precisely detected, on a work by providing the machine with a hole position detector for detecting a screw hole position by means of an ultrasonic transmitting/receiving element. CONSTITUTION:A head 20 is shifted under control of a numerical control device to position it outside of the peripheral area 65 of a hole 28 on a work 27. An ultrasonic beam transmitted and/or received by an ultrasonic transducer 53 has a center 62 which strikes against the work 27 at the intersecting point 66. The ultrasonic transducer 53 is instructed by a detection starting signal transmitted from a detection starting signal output unit to transmit an ultrasonic beam to and receive it from the work 27, for detecting the central position of the hole 28 in the direction of the axis X. The detected position is compared with the position of the X-Y table by means of a pre-stored program, so that any deviation is corrected. After a position in the direction of the axis Y is also corrected in the same manner, a screw is started to drive in the hole. |
