Method and apparatus for rolling strip

Claim 1

APPARATUS FOR ROLLING STRIP UNDER COMPRESSION AND TENSION COMPRISING A PAIR OF ROTATABLE ROLLS, THE STRIP FIRST PASSING AROUND THE FIRST OF SAID ROLLS, THEN BETWEEN THE FIRST AND SECOND ROLLS UNDER COMPRESSION AND THEN AROUND THE SECOND ROLL, MEANS FOR MOVING THE ROLLS TOWARD AND AWAY FROM ONE ANOTHER TO VARY THE GAP THEREBETWEEN, A FIRST DRIVE SHAFT FOR SAID FIRST ROLL, A SECOND DRIVE SHAFT FOR SAID SECOND ROLL, A MOTOR CONNECTED TO SAID SECOND DRIVE SHAFT, MEANS FOR OBTAINING AN IMPULSE PROPORTIONAL TO THE TORQUE ON SAID FIRST DRIVE SHAFT, MEANS FOR OBTAINING AN IMPULSE PROPORTIONAL TO THE TORQUE ON SAID SECOND DRIVE SHAFT, MEANS COMPARING THE TORQUE IMPULSES ON SAID FIRST AND SECOND DRIVE SHAFTS, AND MEANS RESPONSIVE TO A SIGNAL FROM SAID TORQUE COMPARING MEANS TO MOVE THE ROLLS TOWARD ONE ANOTHER WHEN THE RATIO BETWEEN THE TORQUES VARIES FROM A PRESET AMOUNT IN A DIRECTION INDICATING TOO MUCH TENSION AND TO MOVE THE ROLLS AWAY FROM ONE ANOTHER WHEN THE RATIO BETWEEN THE TORQUES VARIES FROM THE PRESET AMOUNT IN A DIRECTION INDICATING TOO LITTLE TENSION.