Positioning numerical control device for machine tools and similar equipments

Claim 1

IN A PROGRAMMED CONTROL SYSTEM FOR CONTROLLING A MACHINE-TOOL IN AT LEAST TWO DIRECTIONS FOR MOVEMENT IN DEPENDENCE ON RECORDED DIGITAL PROGRAM DATA WHICH COMPRISES IN RESPECT TO EACH SAID DIRECTION A SEQUENCE OF DIGITAL NUMBERS IN BINARY NOTATION REPRESENTING A SUCCESSION OF INSTANTANEOUS POSITIONS SPACED ALONG THE RELEVANT DIRECTIONS, MEANS FOR READING SAID RECORDED SEQUENCE OF NUMBERS, A DIGITAL-ANALOGUE CONVERTER HAVING AN INPUT FROM AN OSCILLATOR CONTROLLED BY A CLOCK PULSE SIGNAL ON SAID PROGRAM FOR EACH SEQUENCE OF SID NUMBERS, SAID CONVERTER HAVING A CONTROL INPUT HAVING A RELAY FOR EACH DIGIT OF THE NUMBER AS READ, SAID CONVERTER HAVING ELEMENTS IN CIRCUIT WITH SAID OSCILLATOR, SAID ELEMENTS BEING UNDER CONTROL OF SAID RELAYS AND PROVIDING A SUPPLY OF SINE AND COSINE VALUES OF AN ANGLE CORRESPONDING TO THE BINARY NUMBER AS READ, A POSITION SENSING DEVICE, A SERVO-MOTOR FOR THE RELEVANT DIRECTION AND A MEMORY CONDENSER FEEDING SAID SERVO-MOTOR, SAID POSITION SENSING DEVICE HAVING AN INPUT OF SAID SUPPLY AND AN ERROR SIGNAL OUTPUT, SAID OSCILLATOR AND HENCE SAID OUTPUT HAVING A NUMBER OF OSCILLATIONS, SAID OUTPUT BEING AN INPUT TO A SWITCH HAVING AN OUTPUT LEASING TO SAID MEMORY CONDENSER FOR SAID SERVO-MOTOR, AND MEANS FOR DERIVING SWITCHING IMPULSES OPERATING SAID SWITCH TO TRANSMIT SAID ERROR SIGNAL TO SAID CONDENSER.