Abstract: A roller cam mechanism and driver assembly which features a positive retraction cam elements comprised of auxiliary rollers and side plate slots which cooperate upon failure of a retraction spring compressed by advance of a tooling slide to cause positive retraction of a tooling slide.

Abstract: An in-die tapping unit for a press in which two ball screw mechanisms are driven by closing motion between two housing pieces caused by press actuation. Both ball screw mechanisms rotate a central drive gear which causes rotation and axial advance of a pitch adapter sleeve axially advanced by a threaded engagement with a fixed pitch adapter hub, the movable pitch adapter carrying a tap holder, which rotates and advances a tap inserted therein. A striker pad and acceleration spring reduces the shock loading of the unit when the press engages the upper housing piece.