Patent ID: 6408728
Filing Date: 2002-06-25
Classification: B26D,B26F,H05K,Y10T

Abstract:
A punching apparatus for applying perforating machining to a workpiece by using punch members, said apparatus comprising:a punch holder secured to an upper die, said punch holder having a plurality of longitudinal holes formed therein, wherein each of said plurality of longitudinal holes has a rectangular cross section; a die member secured to a lower die; a plurality of grip members detachably fastened to said punch holder, said plurality of grip members each having a rectangular cross section corresponding to that of said longitudinal holes, and a plurality of grooves formed on at least two opposing side walls of said rectangular cross section, wherein each of said grip members is fitted to said punch holder with a gap such that crosspieces formed between said grooves on said side walls of each said grip member have a circular arc-shaped configuration and slidably contact with side walls of each respective longitudinal hole, such that the position of each grip member relative to said punch holder is determined by the position of each respective longitudinal hole.