FAULT MARKING METHOD AND SHEET MATERIAL CLEARLY MARKED AT FAULT POSITION

摘要

PURPOSE: To solve the problem that a mark given to a fault position is lost to miss the fault when working a sheet with a coating tool and other working machine, and that the mark is easy to be lost when receiving the treatment using a liquid. CONSTITUTION: A line sensor 5 detects a fault 2 of a traveling sheet material 1, and a marking tool such as a grinding wheel 7 with a shaft is brought in contact with the sheet material at a position having the fault or near there with the operation of a solenoid 6 to give a mark.