Patent ID: 7201101
Filing Date: 2007-04-10
Classification: B26D,B26F,Y10S,Y10T

Abstract:
1. A punch comprising: a jig having four punching regions radially symmetrical to each other on the basis of a punching center, each region separated from adjacent regions by a border, and a pattern hole of a predetermined pattern formed on the jig and disposed in the four punching regions; a guide column extended upward from each of the borders of the punching regions on the jig, each of the guide columns having a guide surface on opposite sides thereof, each of the guide surfaces extending substantially linearly in a substantially radial direction toward the punching center for guiding an edge of a supplied sheet member; a base to which the jig is fixed, the base providing a supply surface so that a rectangular corner of the sheet member to be punched is supplied between the adjacent guide columns; a punching member having a punch pin corresponding to the pattern hole, the punch pin cooperating with the pattern hole to punch the rectangular corner of the supplied sheet member with moving up and down of the punching member relative to the jig, the punching member guided by the guide columns, wherein elongated guide holes are formed in the punching member so that the guide columns cooperate therewith; and an elastic body interposed between the punching member and the jig to elastically bias the punching member upward.