| 摘要 |
PURPOSE:To detect the eccentricity of the titled perforation accurately, by providing a conductive eccentricity detecting bush having a receiving hole for a drill bit in a product receiving table of a hole perforating device, so that they are insulated, and generating a signal when the drill bit is contacted with the eccentricity detecting bush. CONSTITUTION:On the product receiving table 7, the conductive detecting bush 22, which is provided with the receiving hole 22a of the drill bit 6 through insulating plates 21, is provided on the same axis of the drill bit 6. Said detecting bush 22 is connected with one terminal of a relay 25 through a conductive plate 23 held between the insulating plates 21 and 21 and a lead wire 24. The other terminal of the relay 25 is connected to the hole perforating device which is conducted to the drill bit 6. Thus a circuit is constituted. A minute DC of, e.g. 12V DC, is applied to said circuit when the circuit is conducted, i.e. when the drill bit 6 is bent due to the eccentric hole and the circuit is closed, a buzzer is sounded. |
