| 摘要 |
PURPOSE:To detect the residual amount of wire wound round a wire supply reel by applying a voltage between the wire outer periphery wound round said reel and a conductive member pressing said wire outer periphery while contacting with it and assuming the detected voltage to represent said residual amount. CONSTITUTION:A wire 1 is wound such that its first layer is wound traversing along the surface of an insulated processing wire supply reel 2 in the one direction, and then the second layer wound traversing in the opposite direction. A conductive member 3 is contacted with and pressed against the outer peripheral surface 1' of said wire 1. When the number of wound layer of the wire 1 is reduced to only its first layer, and the voltage of a detecting device 5 drops below a prescribed value, the continuity between member 3 and wire 1 is cut off and voltage between terminals 6, 8 becomes zero, enabling it to be detected that the residual wire amount is dropped below a specific value. |
