Patent ID: 8113032
Filing Date: 2012-02-14
Classification: B21D

Abstract:
1. Device for the automatic punching of circular electric stator sheets and/or rotor sheets, comprising: a punch tool, which includes a punch stamp and a matrix, said tool producing different punches in an electric sheet in response to different punch stroke lengths; an actuating drive, which is connected to the punch stamp in order to adjust said punch stamp to perform a variable punch stroke in a travel-controlled manner; a travel-measuring device for the detection of a position of the punch stamp; an advance device for the controlled stepwise rotational movement of an electric sheet relative to the matrix; and a control means, which is connected to the actuating drive, to the travel-measuring device and to the advance device for pre-specifying and synchronizing the movement of the punch stamp, including varying the stroke length, and of the advance device during punching and stepwise rotational movement of the electric sheet to produce different shaped punches at selected desired locations on the electric sheet during the stepwise movement, and for producing at least one maximum lifting stroke, which is greater than any stroke length used during punching and advancement, following a specified number of variable length punching strokes of an electric sheet to facilitate removal of a punched sheet from the punching device and insertion of a new sheet to be punched into the punching device.