KGV2 anti tearing sensor is selected. After the tape is torn horizontally, there will be some tape sagging. The sagging tape drives the tear sensor crossbar, and the crossbar drives the vertical bar to fall down, so that the internal switch acts, alarms and stops immediately. The sensor can not be reset automatically. It needs to manually set up the sensing vertical bar and turn the emergency stop switch installed in the protection box once to restore the normal state.