| 摘要 |
PURPOSE:To make photoelectric converting and detect drill breaking by constituting a captioned device in such a way that the reflected beam caused by the luminous projection to the drill end extracted from a workpiece after drilling by means of an optical fiber is received by means of a second optical fiber in a position and direction where the drill end is not detected in the case of drill breaking. CONSTITUTION:When the drilling position on a print circuit board 1 is decided, a pressure foot 5 is lowered to make a foot section 8 fix the print circuit board 1, and a slider 4 is lowered to perform drilling. After drilling, the slider 4 is raised, and the moment a drill 2 is extracted from the workpiece, a detecting circuit becomes ON projecting a beam from the luminous projection fiber of an optical fiber 9 to the end of the drill 2, and the reflected beam is received by the luminous receptible fiber 9. when the luminous receptible fiber 9 is on the left end in the direction of a chain line 52, a normal drill in the area enclosed with a curved line 51 is detected and a broken drill in the area enclosed with a curved line 53 is detected. When the drill 2 is positioned in the area 54 which is the area excluding the area 53, a reflected beam is, therefore, not input in the case of drill breaking so that drill breaking may be detected by photoelectric converting. |
