公开(公告)号：US3733944A

公开(公告)日：1973-05-22

申请号：US3733944D

申请日：1971-10-12

Applicant: WARNER SWASEY CO

Inventor： DIETRICK E ,  LINKUS J

IPC: B26F1/02 ,  B21D28/36 ,  B21D45/00 ,  B21D45/08 ,  B26F1/04 ,  B26D5/12 ,  B26D7/02 ,  B26D7/18

CPC classification number: B21D45/006 ,  Y10T83/088 ,  Y10T83/175 ,  Y10T83/2135 ,  Y10T83/2137 ,  Y10T83/2166

Abstract: An improved punch press includes a selectively operable stripper unit which presses a workpiece against a lower turret as a tool is retracted away from the workpiece by a ram. A transfer device transmits actuating forces to the stripper unit during an operating cycle of the punch press. To enable the stripper unit to be selectively operated, the transfer device is operable between an active condition in which it is effective to transmit actuating forces to the stripper unit and an inactive condition in which the transfer device is ineffective to transmit actuating forces. A control apparatus initiates a punching operation only after the transfer device has been operated to either the active or inactive condition.