Loop control system

Claim 1

IN A STRIP LOOP CONTROL SYSTEM FOR MAINTAINING A LOOP IN A STRIP OF TRAVELING MATERIAL AT A CONSTANT LENGTH, A BANK OF SELF-GENERATING SOLAR CELLS DISPOSED TO ONE SIDE OF THE LOOP, SAID CELLS BEING PARALLEL CONNECTED TO PRODUCE A SUMMED OUTPUT, A LIGHT SOURCE DISPOSED TO ILLUMINATE THE CELLS FOR DIRECT GENERATION OF A LOW CURRENT SIGNAL PROPORTIONAL TO THE LIGHT ENERGY IMPINGING ON THE CELLS, CONTROLLED DRIVE MEANS FOR TRANSFERRING SAID STRIP THROUGH SAID LOOP, A FIRST PAIR OF SIMILAR TYPE TRANSISTORS HAVING THEIR INPUTS CONNECTED TO OPPOSITE ENDS OF THE SOLAR CELLS TO BIAS SAID TRANSISTORS IN OPPOSITE DIRECTIONS, A SECOND PAIR OF OPPOSITE TYPE TRANSISTORS AND HAVING INPUTS CONNECTED RESPECTIVELY ONE EACH TO THE OUTPUTS OF THE FIRST PAIR OF TRANSISTORS, THE OUTPUT OF SAID SECOND PAIR OF TRANSISTORS BEING CONNECTED TO ACTUATE THE DRIVE MEANS, AND FEEDBACK MEANS FROM THE OUTPUT OF SAID SECOND PAIR OF TRANSISTORS TO THE INPUT OF THE FIRST PAIR OF TRANSISTORS FOR REDUCING THE IMPEDANCE OF SAID FIRST PAIR AND THEREBY PERMITTING SAID DIRECT COUPLING OF THE SOLAR CELLS TO SAID FIRST PAIR OF TRANSISTORS.