Pulse rate responsive motor control for a machine tool

Claim 1

APPARATUS FOR CONTROLLING TWO RELATIVELY MOVABLE MEMBERS TO PRODUCE RELATIVE MOVEMENT THEREOF ALONG A PATH HAVING A VARIABLE RADIUS PORTION, COMPRISING: (A) TWO PULSE RESPONSIVE MOTORS, EACH OPERATIVELY CONNECTED TO THE MEMBERS FOR PRODUCING RELATIVE MOVEMENT THEREOF IN THE DIRECTION OF ONE OF TWO COORDINATE AXES; (B) A SOURCE OF ELECTRICAL PULSES; (C) TWO PULSE RATE MULTIPLIERS; (D) EACH OF SAID PULSE RATE MULTIPLIERS (1) INCLUDING AN INPUT AND AN OUTPUT, AND (2) BEING EFFECTIVE TO PRODUCE AT THE OUTPUT A TRAIN OF PULSES HAVING AN AVERAGE PULSE RATE EQUAL TO THE INPUT AVERAGE PULSE RATE TIMES A MULTIPLICAND; (E) FIRST ACCUMULATOR MEANS FOR DETERMINING A MULTIPLICAND FOR ONE PRIMARY MULTIPLIER; (F) SECOND ACCUMULATOR MEANS FOR DETERMINING A MULTIPLICAND FOR THE OTHER PRIMARY MULTIPLIER; (G) EACH ACCUMULATOR MEANS INCLUDING: (1) MEANS FOR SETTING AN INITIAL MULTIPLICAND, AND (2) PULSE RATE RESPONSIVE MEANS FOR VARYING THE MULTIPLICAND; (H) MEANS CONNECTING THE INPUTS OF BOTH MUTIPLIERS TO THE SOURCE;