Control system

Claim 1

IN A SYSTEM FOR CONTROLLING THE MOVEMENT OF A MOVABLE TOOL RELATIVE TO A ROTATING WORKPIECE WHEREIN PULSES ARE PRODUCED BY A SYSTEM GENERATOR, SAID GENERATED PULSES ARE APPLIED TO A VELOCITY COMMAND DEVICE WHICH, IN RESPONSE TO INPUT DATA, CAN MODIFY THE RATE OF SAID PULSES FOR CONTROLLING THE SPEED OF MOVEMENT OF SAID TOOL, AND SAID PULSES FROM SAID VELOCITY COMMAND ARE APPLIED TO A FUNCTION GENERATOR WHICH, IN RESPONSE TO INPUT DATA, CAN RESOLVE SAID PULSES INTO ONE OR MORE COMPONENTS FOR MOVEMENT OF SAID TOOL IN ONE OR MORE DIRECTIONS, A THREAD CUTTING IMPROVEMENT COMPRISING A FIRST GENERATOR FOR PRODUCING FIRST PULSES AT A RATE INDICATIVE OF THE ROTATIONAL SPEED OF SAID WORKPIECE, FIRST OPERABLE MEANS COUPLED TO SAID FIRST GENERATOR, SYNCHRONIZING MEANS FOR OPERATING SAID FIRST OPERABLE MEANS IN RESPONSE TO A PREDTERMINED ROTATIONAL POSITION OF SAID WORKPIECE, SECOND OPERABLE MEANS FOR ALTERNATIVELY COUPLING SAID FUNCTION GENERATOR TO SAID FIRST OPERABLE MEANS AND TO SAID VELOCITY COMMAND DEVICE, THIRD OPERABLE MEANS FOR ALTERNATIVELY COUPLING SAID VELOCITY COMMAND DEVICE TO SAID FIRST OPERABLE MEANS AND TO SAID SYSTEM GENERATOR, AND MEANS RESPONSIVE TO AN INPUT SIGNAL FOR OPERATING SAID SECOND