Interpolating arrangements especially for the automatic control of machine tools

Claim 1

AN INTERPOLATING ARRANGEMENT COMPRISING FIRST INTERPOLATING MEANS RESPONSIVE TO INPUT SIGNALS FOR GENERATING SIGNALS REPRESENTING VALUES OF A CO-ORDINATE AT A FIRST SET OF SUCCESSIVE SPACED POINTS OF A FIRST LOCUS TERMINATING AT A JUNCTION POINT, SECOND INTERPOLATING MEANS RESPONSIVE TO INPUT SIGNALS FOR GENERATING SIGNALS REPRESENTING VALUES OF SAID CO-ORDINATE AT A SECOND SET OF SUCCESSIVE SPACED POINTS OF SAID FIRST LOCUS BEGINNING AT SAID JUNCTION POINT, SELECTOR MEANS FOR SELECTING SIGNALS FROM SAID FIRST MEANS AT A FIRST RATE, AND FROM SAID SECOND MEANS AT A SECOND RATE, AND MEANS FOR DESCRIBING A SECOND LOCUS CONNECTING A CHOSEN POINT OF SAID FIRST SET WITH A CHOSEN POINT OF SAID SECOND SET AT A SMOOTHLY VARYING OR CONSTANT RATE, SO THAT THERE ARE NO DISCONTINUITIES IN THE RATE OF CHANGE OF SAID CO-ORDINATE VALUE BETWEEN SAID TWO CHOSEN POINTS, SAID MEANS FOR DESCRIBING A SECOND LOCUS INCLUDING MEANS ARRANGED TO ADD TO THE SIGNALS REPRESENTING CO-ORDINATE VALUES OF SAID POINTS SIGNALS REPRESENTING PROGRESSIVELY INCREASING FRACTIONS OF THE DIFFERENCE IN THE CO-ORDINATE