Modular die transfer system

Abstract

A die transfer system for transferring workpieces through successive die stations in a stamping press includes an enlongated finger bar having spaced fingers for engaging workpices at successive die stations, a first drive mechanism for reociprocating the finger bar longitudinally for transferring workpieces between successive die stations, and a second drive mechanism for reciprocating the finger bar laterally into and out of engagment with the workpieces at the die stations. The second drive mechanism has at least two finger bar drive modules coupled to the finger bar and spaced from each other lengthwise of the finger bar. A drive shaft extends between and interconnects the two drive modules. Each of the drive modules has a crank arm coupled to the drive shaft for rotating the crank arm about an axis parallel the finger bar. A cam plate is coupled to the finger bar and mounted for movement lateral to the crank arm axis and the finger bar. The cam plate has a cam slot extending in a direction lateral to the crank arm axis, and a cam follower is mounted on the crank arm and disposed in the slot such that rotation of the drive shaft rotates the crank arm and propels the cam follower along the cam plate slot while simultaneously driving the cam plate and the finger bar laterally into and out of engagement with workpieces at the die stations. The drive shaft is rotated in synchronism with operation of the stamping press by an electric servo motor and motor controller coupled to a sensor for monitoring position of the stamping press ram.