Apparatus for controlling a machine tool or the like

Claim 1

A MACHINE TOOL HAVING A FIRST SPEED CHANGE TRANSMISSION MEANS INCLUDING GEAR TRAINS OPERATIVELY CONNECTED TO A MULTI-SPEED SPINDLE ASSEMBLY, A SECOND SPEED CHANGE TRANSMISSION MEANS INCLUDING GEAR TRAINS OPERATIVELY CONNECTED TO A MULTI-FEED TOOL CARRIAGE ASSEMBLY, A WORK SUPPORT, AND A CONTROL MEANS MECHANISM; SAID CONTROL MECHANISM COMPRISING, IN COMBINATION, PLURAL HYDRAULIC ACTUATOR MEANS SELECTIVELY OPERABLE TO ENTRAIN PREDETERMINED GEAR TRAINS FOR DRIVING SAID SPINDLE AND FEEDING SAID TOOL AT PRESELECTED OPERATING SPEEDS AND FEEDING RATES, RESPECTIVELY; PLURAL VALVE MEANS EACH OPERATIVELY CONTROLLING A RESPECTIVE ACTUATOR MEANS AND EACH HAVING A PAIR OF CONTROL POSITIONS; ELECTRICAL OPERATING MEANS FOR EACH OF SAID VALVE MEANS EACH OPERABLE TO MOVE ITS ASSOCIATED VALVE MEANS SELECTIVELY TO EITHER CONTROL POSITION THEREOF; A FIRST ENERGIZING CIRCUIT FOR EACH OPERATING MEANS, EACH INCLUDING A FIRST SWITCH, A SECOND ENERGIZING CIRCUIT FOR EACH OPERATING MEANS, EACH INCLUDING A SECOND SWITCH; THE FIRST AND SECOND ENERGIZING CIRCUITS FOR EACH OPERATING MEANS BEING IN PARALLEL WITH EACH OTHER; MANUALLY OPERABLE SWITCH SETTING MEANS OPERATING SAID FIRST SWITCH AND HAVING PLURAL SETTING POSITIONS IN EACH OF WHICH THE FIRST SWITCHES ARE SELECTIVELY OPERATED TO PRE-SET THE ASSOCIATED OPERATING MEANS TO OPERATE THE ASSOCIATED VALVE MEANS TO A SELECTED CONTROL POSITION UPON CLOSURE OF SAID FIRST ENERGIZING CIR-