Patent ID: 7997190
Filing Date: 2011-08-16
Classification: B21J,B23P,Y10T

Abstract:
1. A drive for a ram press, comprising: a frame; screw drive means mounted to said frame, said drive means being selectively rotatable in opposite directions by first motor means; a ram mounted to said screw drive reciprocal in a range of motion between extended and retracted positions; second motor means connected to said screw drive means for rotation thereof; a bidirectional, self-disengaging clutch having an input shaft connected to said second motor means and an output shaft connected to said screw drive means whereby the clutch disengages whenever said output shaft is driven at a speed greater than the speed of input shaft; and a programmable logic control system for regulating the position of the ram by operation of said first motor means and said second motor means whereby said first motor means is signaled to rotate said screw drive at a higher rate of speed relative to said second motor means during a fast movement phase of moving said ram, said clutch being disengaged thereby.