Machine tool hydraulic system

Claim 1

IN A MACHINE TOOL HAVING A MOVABLE MEMBER OPERABLE IN A MACHINING OPERATION, A HYDRAULIC SYSTEM TO CONTROL THE MOVEMENT OF THEREOF COMPRISING, A RESERVOIR CONTAINING A LIQUID SUPPLY, A BODY MEMBER, A PISTON MOVABLE SUPPORTED IN THE BODY MEMBER AND HAVING AN OPERABLE CONNECTION TO THE MOVABLE MEMBER, SAID BODY MEMBER HAVING A FLUID CHAMBER ON OPPOSITE SIDES OF THE PISTON, CONDUIT MEANS CONNECTED TO THE FLUID CHAMBERS, VALVE MEANS CONNECTED TO THE CONDUIT MEANS FOR SELECTING THE CHAMBER TO RECEIVE LIQUID FLOW FOR MOVEMENT OF THE PISTON IN ONE DIRECTION AND TO RECEIVE FLOW FROM THE OPPOSITE CHAMBER, RETURN CONDUIT MEANS CONNECTED TO THE VALVE MEANS FOR RETURNING FLUID RECEIVED FROM SAID OPPOSITE CHAMBER TO THE SUPPLY RESERVOIR, MEANS FOR OPERATING THE VALVE MEANS, A RAPID TRAVERSE HYDRAULIC PUMP WITH ITS INLET CONNECTED TO THE SUPPLY RESERVOIR AND ITS OUTLET CONNECTED TO THE VALVE MEANS FOR SUPPLYING LIQUID THERETO TO RAPIDLY TRAVERSE THE PISTON, DRIVE MEANS FOR THE RAPID TRAVERSE PUMP, A FINE FEED HYDRAULIC PUMP HAVING AN OUTPUT VOLUME WHICH IS EXTREMELY SMALL CONNECTED TO THE RAPID TRAVERSE PUMP AND HAVING ITS INLET CONNECTED TO THE SUPPLY RESERVOIR AND ITS OUTLET CONNECTED TO THE BODY MEMBER FOR SUPPLYING LIQUID FLOW THERETO TO MOVE SAID PISTON AT A SLOW POSITIVE FEED RATE, DRIVE MEANS FOR THE FINE FEED PUMP, SAID CONDUIT MEANS INCLUDING COMMON JUNCTION MEANS UPSTREAM OF SAID FLUID CHAMBERS RECEIVING LIQUID FLOW SIMULTANEOUSLY FROM SAID RAPID TRAVERSE AND FINE FEED PUMPS DURING RAPID TRAVERSE MOVEMENT OF SAID PISTON AND SUPPLYING SUCH COMBINED FLOW TO THE SELECTED CHAMBER, AND MEANS FOR STOPING FLOW FROM SAID RAPID TRAVERSE PUMP TO SAID JUNCTION MEANS DURING FINE FEED WHEREBY FINE FEED MOVEMENT OF SAID PISTON IS OBTAINED THROUGH THE CONTINUING SUPPLY OF LIQUID FLOW FROM SAID FINE FEED PUMP.