Patent ID: 6769600
Filing Date: 2004-08-03
Classification: B21D,H02K,Y10T

Abstract:
A method for notching an outer lamination and an inner lamination from a single lamination blank, comprising:(a) providing a single punch station; (b) providing a punch and die assembly including an outer slot punch portion, an inner slot punch portion, and a separator punch portion, wherein the outer slot punch portion, the inner slot punch portion, and the separator punch portion are each positionable in respective punching positions and non-punching positions; (c) positioning one of the outer slot punch portion and the inner slot punch portion in its respective punching position and positioning the other of the outer slot punch portion and the inner slot punch portion in its respective non-punching position; (d) rotating the lamination blank past the punch station in a series of indexing steps through a first rotation; (e) repeatedly engaging the lamination blank with the punch and die assembly as the lamination blank is rotated through the first rotation forming a first pattern of spaced notches in the lamination blank; (f) reversing the punching and non-punching positions of the outer slot punch portion and the inner slot punch portion; (g) rotating the lamination blank past the punch station in a series of indexing steps through a second rotation; (h) repeatedly engaging the lamination blank with the multi-piece punch and die assembly as the lamination blank is rotated through the second rotation forming a second pattern of spaced notches in the lamination blank; (i) positioning the separator punch portion in the punching position during one of the first rotation and the second rotation for separating the lamination blank into the inner lamination and the outer lamination; and wherein the first pattern of spaced notches is formed in one of the inner lamination and the outer lamination and the second pattern of spaced notches is formed in the other of the inner lamination and the outer lamination.