Registration system for a moving web

Claim 1

APPARATUS FOR CORRECTING ERRORS IN THE REGISTRATION OF MULTIPLE REPEAT OPERATIONS ON A MOVING WEB, SAID APPARATUS COMPRISING AN OSCILLATOR FOR GENERATING PULSES CORRESPONDING TO A DESIRED MINIMUM UNIT OF ERROR, SCANNERS FOR SCANNING TARGETS REPRESENTING THE MULTIPLE OPERATIONS, BINARY MEANS FOR DIGITIALLY COUNTING THE NUMBER OF PULSES BETWEEN TARGETS AS AN ACCURATE MEASURE OF THE MAGNITUDE OF THE ERROR TO BE CORRECTED, MEANS FOR DERIVING AN ERROR VOLTAGE PROPORTIONAL TO THE NUMBER OF PULSES REPRESENTING THE ERROR, A VARIABLE SPEED CORRECTION MOTOR, A COMPARATOR CIRCUIT, THE SAID MOTOR ARMATURE BEING USED AS A GENERATOR TO PROVIDE AN OUTPUT RATE FEEDBACK, THE ERROR VOLTAGE AND THE OUTPUT RATE FEEDBACK BEING OPPOSED IN SAID COMPARATOR CIRCUIT TO PROVIDE A LOGIC ERROR SIGNAL, AND MEANS RESPONSIVE TO THE LOGIC ERROR SIGNAL FOR DRIVING THE CORRECTION MOTOR AT A RATE SUBSTANTIALLY PROPORTIONAL TO THE MAGNITUDE OF THE ERROR VOLTAGE REGARDLESS OF VARIATIONS IN LOAD, IN ORDER TO REDUCE THE ERROR.