| 摘要 |
PURPOSE:To monitor a position, length, visibility, etc. of a defective part mark, and to assure the reliability by collating a defect signal of a flaw detector with a mark discriminating signal by a mark sensor the defective part mark which has been affixed to an inspecting material by a marking device. CONSTITUTION:A flaw of an inspecting material 1 is detected by a flaw sensor 4, and a defect signal is inputted to a control part 7 and a monitor 12. The control part shifts the defect signal by a signal from a length measuring machine 6, the marking device is operated immediately before a defective part passes through the marking device 8, and a command is given so that a prescribed length is brought to marking. The monitor 12 shifts a defect signal from a flow detector 3, by a signal from the length measuring machine 6, and turns on a function of a mark sensor 11, when a defect mark has come to a position of the mark sensor. When the defect mark is detected during a distance in which the mark sensor is operating sensor, it is decided that the marking device 8 is operating normality.
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