Digital servo and incremental positioner

Claim 1

IN A DEVICE FOR POSITIONING A SHAFT IN ACCORDANCE WITH A DESIRED VALUE OF A COORDINATE HAVING X DECIMAL DIGITS STORED IN THE FORM OF Y BINARY DIGITS PER DECIMAL DIGITS, THE COMBINATION THEREWITH OF FIRST AND SECOND GROUPS OF X TIMES Y GATES, SAID GROUPS HAVING PAIRS OF CORRESPONDING GATES, MEANS FOR APPLYING TO THE SUCCESSIVE GATES OF SAID GIRST GROUP POTENTIALS REPRESENTATIVE OF THE SUCCESSIVE BINARY DIGITS OF SAID COORDINATE, MEANS COUPLED TO SAID SHAFT FOR APPLYING TO SUCCESSIVE GATES OF SAID SECOND GROUP SUCCESSIVE ONES OF X TIMES Y POTENTIALS EACH REPRESENTATIVE OF A DIFFERENT ROTATIONAL POSITION OF SAID SHAFT, A SINGLE GATE HAVING A PAIR OF INPUTS CONNECTED TO THE OUTPUTS OF THE GATES OF SAID GROUPS, MEANS FOR SUCCESSIVELY OPENING SAID PAIRS OF CORRESPONDING GATES, A REVERSIBLE MOTOR COUPLED TO SAID SHAFT AND HAVING INPUT CIRCUITS FOR REVERSIBLE OPERATION, A PULSE GENERATOR, AND MEANS OPERATED BY THE OUTPUT OF SAID SINGLE GATE TO INACTIVE SAID GATE OPENING MEANS AND TO CONNECT SAID GENERATOR TO SAID MOTOR SELECTABLY WITH ONE OF SAID INPUT CIRCUITS DEPENDENT ON WHICH GATE OF SAID OPENED PAIR OF GATES HAS THE LARGER OUTPUT.