Tool changing machine tool

Claim 1

IN A MACHINE TOOL; A FRAME; A SOURCE OF POWER; A SPINDLE PROVIDED WITH AN AXIAL BORE AND HAVING A LOADING END AND AN OPERATING END ROTATABLY SUPPORTED BY SAID FRAME AND OPERABLY CONNECTED TO BE DRIVEN BY SAID SOURCE OF POWER FOR PERFORMING A WORK OPERATION; A TOOL CHANGE MEANS SUPPORTED BY SAID FRAME FOR ROTATIONAL AND AXIAL MOVEMENTS AND ADAPTED TO RELEASABLY CARRY A PLURALITY OF CUTTING TOOLS THEREIN; A FIRST ACTUATOR CONNECTED TO BE DRIVEN BY SAID SOURCE OF POWER TO ROTATE SAID TOOL CHANGE MEANS FOR SELECTIVELY POSITIONING SAID CUTTING TOOLS FOR INSERTION INTO THE LOADING END OF SAID SPINDLE; A SECOND ACTUATOR CONNECTED TO BE DRIVEN BY SAID SOURCE OF POWER TO EFFECT AXIAL MOVEMENT OF SAID TOOL CHANGE MEANS FOR INSERTING A SELECTED CUTTING TOOL INTO THE LOADING END OF SAID SPINDLE, SAID TOOL CHANGE MEANS ALSO OPERATING WHEN INSERTING A TOOL HOLDER INTO SAID SPINDLE TO SEAL THE LOADING END OF SAID SPINDLE; A SOURCE OF AIR PRESSURE OPERATED BY SAID SOURCE OF POWER AND OPERABLY CONNECTED TO SUPPLY AIR PRESSURE TO THE SEALED END OF SAID SPINDLE FOR MOVING A SELECTED CUTTING TOOL OUT OF SAID TOOL CHANGE MEANS AND INTO THE OPERATING END OF SAID SPINDLE; MEANS OPERABLY CONNECTED TO REVERSE THE OPERATION OF SAID SOURCE OF AIR PRESSURE TO CREATE A VACUUM IN THE LOADING END OF SAID SPINDLE AND ALSO SUPPLY AIR PRESSURE TO THE OPERATING END OF SAID SPINDLE FOR MOVING A CUTTING TOOL FROM THE OPERATING END OF SAID SPINDLE TO THE LOADING END THEREOF AND ENGAGE THE CUTTING TOOL IN SAID TOOL CHANGE MEANS; AND MEANS FOR REVERSING THE OPERATION OF SAID SECOND ACTUATOR FOR MOVING SAID TOOL CHANGE MEANS IN ITS AXIAL MOVEMENT IN THE OPPOSITE DIRECTION TO WITHDRAW THE CUTTING TOOL FROM SAID SPINDLE.