Control arrangement for level rolling metal plates and sheets in reversible rolling mills

Claim 1

IN A REVERSIBLE ROLLING MILL HAVING AT LEAST ONE PAIR OF OPPOSED ROLLERS FOR REDUCING THE THICKNESS OF A METAL SHEET HAVING A SPECIFIC DEFORMATION RESISTANCE WHICH VARIES AS A FUNCTION OF ITS TEMPERATURE DURING A SERIES OF PASSES INCLUDING AT LEAST A PAIR OF PASSES THERETHROUGH, AND MEANS FOR VARYING THE SPACING OF SAID ROLLERS, THE IMPROVEMENT COMPRISING: FIRST MEANS FOR GENERATING A FIRST SIGNAL INDICATIVE OF THE REDUCTION IN THICKNESS TAKING PLACE AS SAID SHEET IS PASSING THROUGH SAID ROLLERS DURING THE FIRST OF SAID PAIR OF PASSES; SECOND MEANS FOR GENERATING A SECOND SIGNAL INDICATIVE OF THE WIDTH OF SAID SHEET; THIRD MEANS FOR GENERATING A THIRD SIGNAL INDICATIVE OF THE PRESSURE BEING EXERTED BY SAID ROLLERS ON SAID SHEET DURING SAID FIRST OF SAID PAIR OF PASSES; FOURTH MEANS FOR GENERATING FROM SAID FIRST, SAID SECOND, AND SAID THIRD SIGNALS, A FOURTH SIGNAL INDICATIVE OF SAID SPECIFIC DEFORMATION RESISTANCE OF SAID SHEET; FIFTH MEANS FOR CONDUCTING SAID FIRST, SAID SECOND, AND SAID THIRD SIGNALS TO SAID FOURTH MEANS; SIXTH MEANS FOR SELECTIVELY PREVENTING SAID FIFTH MEANS FROM CONDUCTING SAID FIRST AND SAID THIRD SIGNALS TO SAID FOURTH MEANS; SAID FOURTH MEANS INCLUDING MEANS, OPERABLE WHEN SAID SIXTH MEANS IS PREVENTING CONDUCTION OF SAID FIRST AND SAID THIRD SIGNALS TO SAID FOURTH MEANS FOR GENERATING A FIFTH SIGNAL INDICATIVE OF THE CONTINUOUSLY CHANGING SPECIFIC DEFORMATION RESISTANCE OF SAID SHEET; SAID FOURTH MEANS FURTHER INCLUDING MEANS FOR GENERATING FROM SAID FIFTH SIGNAL, A SIXTH SIGNAL INDICATIVE OF A REDUCED ROLL SPACING CORRESPONDING TO A DESIRED CHANGE IN THICKNESS OF SAID PLATE DURING SAID SECOND PASS OF SAID AT LEAST ONE PAIR OF PASSES WHICH WILL PRODUCE A PREDETERMINED DESIRED PRESSURE ON SAID SHEET IN THE SECOND PASS OF SAID AT LEAST ONE PAIR OF PASSES; SIXTH MEANS RESPONSIVE TO SAID SIXTH SIGNAL FOR CAUSING SAID MEANS FOR VARYING THE SPACING OF SAID ROLLERS TO MOVE SAID ROLLERS TO SAID REDUCED SPACING SUBSEQUENT TO SAID FIRST PASS AND PRIOR TO SAID SECOND PASS.