Machine tool feedrate control system

Claim 1

IN A SYSTEM FOR EFFECTING MOVEMENT OF PARTS ALONG MUTUALLY PERPENDICULAR AXES, OSCILLATOR MEANS FOR GENERATING A VARIABLE FREQUENCY CONTROL SIGNAL, COMMAND PULSE GENERATING MEANS RESPONSIVE TO SAID CONTROL SIGNAL FOR GENERATING A PLURALITY OF TRAINS OF COMMAND PULSES RESPECTIVELY CORRESPONDING TO SAID AXES, MEANS RESPONSIVE TO SAID TRAINS OF COMMAND PULSES FOR DEVELOPING AN OUTPUT SIGNAL AT A RATE PROPORTIONAL TO THE RATE OF ONE OF SAID TRAINS, MEANS FOR DEVELOPING A FEEDRATE COMMAND SIGNAL AT A CERTAIN RATE, A FREQUENCY COMPARATOR INCLUDING FIRST AND SECOND MONOSTABLE MULTIVIBRATOR MEANS RESPECTIVELY TRIGGERED IN RESPONSE TO SAID OUTPUT SIGNAL AND SAID FEEDRATE COMMAND SIGNAL TO DEVELOP OUTPUT PULSES HAVING CERTAIN AMPLITUDES AND DURATIONS, AN INTEGRATING CIRCUIT, MEANS FOR APPLYING SAID OUTPUT PULSES IN OPPOSITION TO SAID INTEGRATING CIRCUIT, AND MEANS RESPONSIVE TO THE OUTPUT OF SAID INTEGRATING CIRCUIT FOR CONTROLLING SAID OSCILLATOR MEANS TO MAINTAIN THE RATE OF SAID OUTPUT SIGNAL EQUAL TO THE RATE OF SAID FEEDRATE COMMAND SIGNAL.