| 摘要 |
PURPOSE:To improve detecting accuracy of a drill break and its detecting efficiency, by receiving light, which passes through a through hole immediately after it is drilled, by a light receiving part and deciding the drill break on the basis of a picture signal showing an output hole drilling pattern. CONSTITUTION:A projector part 5, which generates detection light 3 toward the upper, is provided on the upper surface of a table 2. Through holes 7 are drilled in a work 1 by a drill D. The detection light 3, projected via the through hole 7, is received by a light receiving part 8, and a picture signal, output from the light receiving part 8 having a principal part comprising an ITV camera, CCD camera, etc., is compared with the hole drilling pattern stored in a picture memory 9. On the basis of this compared result, a break decision part 10, containing a microcomputer as the main element, decides the drill to be broken. If a break is decided, a machining stop signal SC is output, and the drill D is replaced by suspending drilling. |
