DISCRIMINATION METHOD AND DISCRIMINATION STRUCTURE OF TWO-PIECE OVERLAPPING OF NUTS UPON WELDING

摘要

PROBLEM TO BE SOLVED: To ensure that, when two pieces of nuts are supplied while being overlapped, a device capable of reliably discriminating the two-piece overlapping of the nuts can be inexpensively constituted without complicating the device.;SOLUTION: In an electrode structure which can simply discriminate that weld nut N is supplied in the two-piece overlapping state, when it is set such that a positioning pin 8 which is projected upward from a lower part electrode 6 and is freely vertically movable is covered with the nut N, a part of the tip part of the positioning pin 8 is projected upward from the upper surface of the nut N, and further, the lower surface of an upper part electrode 2 is turned to be a flat surface, thereby, when the nut N is pushed downward against the lower surface of the upper part electrode 2 and a projection part p of the nut N is brought into pressing contact with an upper surface of a work W such as a perforated steel sheet, the upper surface of the nut N and the upper surface of the positioning pin 8 are set to be flush with each other and the two-piece overlapping is discriminated by setting such a position of the positioning pin as a standard point.;COPYRIGHT: (C)2015,JPO&INPIT