Lukens ii

Claim 1

IN A NUMERICAL CONTROL SYSTEM HAVING A VELOCITY COMMAND THAT PRODUCES PULSES HAVING A RATE WHICH IS VARIABLE AND WHICH IS INDICATIVE OF A DESIRED VELOCITY OF OPERATION, SAID VELOCITY COMMAND COMPRISING BUFFER STORAGE MEANS FOR ACCEPTING THE NEXT PULSE RATE COMMAND AND MEANS FOR STORING THE ACTIVE PULSE RATE COMMAND AND MEANS CONTROLLING SYSTEM ACCELERATION COMPRISING A COMPARATOR COUPLED TO SAID BUFFER STORAGE AND ACTIVE COMMAND STORAGE MEANS FOR COMPARING THE ACTIVE COMMAND PULSE RATE WITH THE DESIRED STORED PULSE RATE AND PRODUCING FIRST SIGNALS INDICATIVE OF THE GREATER AND SMALLER OF SAID RATES AND SECOND SIGNALS INDICATIVE OF THE MAGNITUDE OF DIFFERENCE OF SAID RATES, MEANS FOR PRODUCING AN ACCELERATE SIGNAL IN RESPONSE TO A DEPARTURE SIGNAL, SAID ACCELERATE SIGNAL HAVING A SELECTABLE UP AND DOWN CHARACTERISTIC DETERMINED BY SAID FIRST SIGNALS AND HAVING A PREDETERMINED PULSE RATE, MEANS COUPLING SAID FIRST SIGNALS FROM SAID COMPARATOR TO SAID ACCELERATE SIGNAL PRODUCING MEANS FOR DETERMINING SAID UP AND DOWN CHARACTERISTIC, DEPARTURE MEANS COUPLED TO SAID COMPARATOR FOR PRODUCING SAID DEPARATURE SIGNAL AT DISTANCES CONTROLLED BY SAID SECOND SIGNALS, MEANS COUPLING SAID DEPARTURE SIGNAL FROM SAID DEPARTURE MEANS TO SAID ACCELERATE SIGNAL PRODUCING MEANS, AND MEANS COUPLING SAID ACCELERATE SIGNAL TO SAID ACTIVE COMMAND STORAGE MEANS FOR VARYING THE RATE OF THE PULSES PRODUCED BY SAID VELOCITY COMMAND UP AND DOWN IN RESPONSE TO SAID UP AND DOWN CHARACTERISTIC AND IN RESPONSE TO SAID PREDETERMINED PULSE RATE.