Numerically controlled work and feed motor driven gear-hobber

Claim 1

A CONTROL SYSTEM FOR A MACHINE HAVING A FIRST ROTATABLE SPINDLE, A SECOND ROTATABLE SPINDLE, AND MEANS FOR FEEDING SAID FIRST SPINDLE, WHEREIN THE FEED OF SAID FIRST SPINDLE MUST BEAR AN INTEGRAL NUMERICAL RELATION TO THE ROTATION OF THE SECOND SPINDLE, COMPRISING: A MOTOR CONNECTED TO SAID FIRST SPINDLE; AN INDEPENDENT POWER SYSTEM FOR SAID MOTOR; A TRANSDUCER CONNECTED TO SAID FIRST SPINDLE AND OPERATIVE TO GENERATE AN ELECTRICAL PULSE FOR EACH PREDETERMINED INCREMENTAL MOTION OF THE FIRST SPINDLE; A DIGITAL OPERATOR CONNECTED TO RECEIVE THE PULSE TRAIN CONSTITUTING THE OUTPUT OF THE TRANSDUCER AND A NUMERICAL QUANTITY AND TO PROVIDE AS AN OUTPUT A PULSE TRAIN HAVING A NUMBER OF PULSES FEWER THAN THE INPUT TRAIN, THE NUMBER OF PULSES IN SAID OUTPUT TRAIN BEING A FACTOR OF BOTH THE NUMBER OF PULSES IN THE INPUT TRAIN AND THE NUMERICAL QUANTITY; A DIGITAL SERVO SYSTEM HAVING SAID SECOND PULSE TRAIN AS ITS INPUT, OPERATIVELY CONNECTED, TO THE SECOND SPINDLE SO AS TO ROTATE IT THROUGH A DISTANCE PROPORTIONAL TO THE NUMBER OF PULSES IN SAID SECOND TRAIN AT A RATE PROPORTIONAL TO THE INSTANTANEOUS PULSE RATE IN SECOND TRAIN; A SECOND OPERATOR HAVING SAID SECOND PULSE TRAIN AND A SECOND NUMERICAL QUANTITY EXPRESSING SAID INTEGRAL NUMERICAL RELATIONSHIP BETWEEN THE ROTATION OF THE SECOND SPINDLE AND THE FEED OF THE FIRST SPINDLE AS ITS INPUTS AND BEING OPERATIVE TO PROVIDE AS AN OUTPUT A THIRD PULSE TRAIN HAVING