Patent ID: 7975523
Filing Date: 2011-07-12
Classification: B21D,B26D,B26F,Y10T

Abstract:
1. In combination, a punch adapted for mounting on a punching machine and an alignment ring, the punch having a cylindrical shaft, one end of the punch having a structure for connection to a punching machine and the other end thereof having a punching point for punching a workpiece, the alignment ring having a top surface and a bottom surface, and having a central bore mountable on the cylindrical shaft in a fixable axial position, the alignment ring having a radial slit of a given width and a clamping device which has a structure to reduce the width of the slit to tighten the axial bore of the alignment ring onto the cylindrical shaft, the alignment ring having a first cut out on its inner periphery of a first given width in a circumferential direction for receiving a radial pin which extends radially outwardly from the cylindrical shaft and is of essentially the same width as the first given width, a second cut out at the outer periphery of the alignment ring of a second given width in the circumferential direction for receiving an axial pin extending axially upwardly from a location on the punching point, which location is spaced radially outwardly from the cylindrical shaft and of essentially the same width as the second given width, the second cut out extending from an intersection with the bottom surface upwardly toward the top surface a sufficient distance to receive the axial pin, wherein the punch may be aligned with the alignment ring by engagement of either or both of the radial pin extending into the first cut out or the axial pin extending into the second cut out.