Hydraulically regulated workpiece accelerating device

Claim 1

IN A SYSTEM FOR CONTROLLING THE MOVEMENT OF A MASSIVE DEVICE TO PERFORM AN OPERATION ON A CONTINUOUSLY MOVING WORKPIECE ENGAGEABLE BY A SIGNAL CONTROLLED CLAMP, AN ACCELERATION CONTROL MECHANISM CONNECTED TO SAID DEVICE FOR IMPARTING MOVEMENT THERETO COMPRISING, A HOUSING CONNECTED TO SAID DEVICE HAVING A FLUID CHAMBER ELONGATED GENERALLY IN A DIRECTION PARALLEL TO THE PATH OF MOVEMENT OF SAID WORKPIECE, A PISTON SLIDABLY RECEIVED IN SAID CHAMBER, FRAME MEANS FIXEDLY MOUNTING SAID PISTON AND GUIDING MOVEMENT OF SAID HOUSING ALONG A PATH GENERALLY PARALLEL TO SAID CHAMBER, A SOURCE OF FLUID UNDER PRESSURE, SERVO VALVE MEANS MOUNTED ON THE HOUSING AND CONNECTING SAID SOURCE TO THE FLUID CHAMBER FOR DISPLACEMENT OF THE DEVICE RELATIVE TO THE PISTON, AND VALVE ACTUATING MEANS CONNECTING THE VALVE MEANS TO THE CLAMP FOR VARYING THE PRESSURE OF THE FLUID IN SAID CHAMBER IN RESPONSE TO ENGAGEMENT OF THE CLAMP WITH THE WORKPIECE.