Motor control device for attaining an angular position

Claim 1

AUTOMATIC ANGULAR POSITIONING CONTROL APPARATUS COMPRISING A PLURALITY OF SELECTIVELY EXCITABLE ENERGISING DEVICES LOCATED AT PRESELECTIBLE ANGULAR POSITIONS, TWO PICK-UP DEVICES EFFECTIVE OVER RESPECTIVE ARCS TOGETHER COVERING A COMPLETE CIRCLE EXCEPT FOR A REFERENCE GAP AND A DIAMETRICALLY OPPOSED GAP IN THE CIRCLE, A THIRD PICKUP DEVICE EFFECTIVE OVER AN ARC LOCATED IN SAID DIAMETRICALLY OPPOSED GAP WITH ISOLATION BETWEEN IT AND THE EFFECTIVE ARC OF EACH OF THE OTHER TWO PICK-UP DEVICES, THE ENERGISING DEVICE BEING EFFECTIVE OVER AN ARC LESS THAN EACH OF SAID GAPS BUT GREAT ENOUGH TO SPAN THE ISOLATION BETWEEN THE EFFECTIVE ARC OF THE THIRD PICK-UP DEVICE AND THAT OF EACH OF THE OTHER TWO PICK-UP DEVICES, AND CONTROL MEANS FOR PRODUCING RELATIVE ROTATION BETWEEN THE PICK-UP DEVICES AND THE ENERGISING DEVICES IN ONE DIRECTION IN RESPONSE TO ENERGISATION OF ONE OF SAID FIRST TWO PICK-UP DEVICES BY AN EXCITED ENERGISING AND IN THE OPPOSITE DIRECTION IN RESPONSE TO SUCH ENERGISATION OF THE OTHER TWO PICK-UP DEVICES SEPARATELY OR TOGETHER.