DETECTING METHOD OF PIN HOLE OF INSULATED WIRE

摘要

PURPOSE:To detect a pin hole of an enamel wire or the like while traveling by carrying a wire material obtained by coating a conductor with enamel or the like by a guide sheave or the like in a wire carrying process and impressing a voltage by regarding the sheave as an electrode. CONSTITUTION:The enamel wire 1 carried from a baking over or the like is wound from a capstan 2 around a winding bobbin 3. At that time, the enamel wire 1 is guided by the guide sheave 4 or a traverse sheave 5. Any one of the guide sheave 4 and the traverse sheave 5 or both of them are used as electrodes to impress a voltage. The electric resistance of a film is detected by the impression of the voltage to detect a pin hole. Since the voltage is impressed to the traveling enamel wire by using the sheave as an electrode, defects such as pin holes can be detected over the whole length of the wire.