Photoelectric scanner for control of fabricating machinery

Claim 1

A PHOTOELECTRIC SCANNER FOR CONTROLLING THE TRAVEL OF MACHINERY ACCORDING TO A GIVEN CURVE, COMPRISING A SUPPORTING STRUCTURE TO MOVE WITH THE TRAVEL TO BE CONTROLLED, A PHOTOCELL FIXEDLY MOUNTED ON SAID STRUCTURE, AN OPTICAL IMAGING SYSTEM HAVING AN OPTICAL AXIS TO BE DIRECTED TOWARD THE CURVE TO BE SCANNED AND BEING ROTATABLY MOUNTED ON SAID STRUCTURE FOR ROTATION ABOUT SAID AXIS, SAID OPTICAL IMAGING SYSTEM HAVING REVERSING MEANS FOR DIRECTIONALLY REVERSING THE DIRECTION OF ONE OF THE TWO COORDINATES OF THE CURVE, AN OSCILLATORY REFLECTOR FIXEDLY MOUNTED ON SAID STRUCTURE OPTICALLY INTERMEDIATE SAID SYSTEM AND SAID PHOTOCELL FOR PERIODICALLY REFLECTING AN IMAGE OF RESPECTIVE CURVE ELEMENTS UPON SAID CELL TO PRODUCE CELL PULSES HAVING A VARIABLE TIME SPACING DEPENDENT UPON DEPARTURE OF SAID TRAVEL FROM SAID CURVE, A REVERSIBLE DRIVE MECHANICALLY CONNECTED WITH SAID SYSTEM FOR ROTATING IT ABOUT SAID AXIS AND ELECTRICALLY CONNECTED TO SAID PHOTO-