Rolling mill and control system

Claim 1

A ROLLING MILL INCLUDING AN UPPER ROLL AND A LOWER ROLL, AN UPPER FRAME MEMBER, SAID UPPER ROLL BEING ROTATABLY CARRIED BY SAID FRAME MEMBER, A LOWER FRAME MEMBER, SAID LOWER ROLL BEING ROTATABLY CARRIED BY SAID LOWER FRAME MEMBER, YIELDABLE MEANS FOR MAINTAINING SAID UPPER AND LOWER FRAME MEMBERS IN SPACED RELATIONSHIP, STAY BOLTS CONNECTING SAID UPPER AND LOWER FRAME MEMBERS AND BEING DIMENSIONED TO ABSORB THE ROLLING PRESSURE TRANSMITTED FROM SAID ROLLS, FLUID PRESSURE OPERATED MEANS OPERATIVELY ASSOCIATED WITH SAID STAY BOLTS TO ELONGATE THE SAME BEFORE OPERATION OF THE ROLLS WITHIN THE ELASTIC LIMIT OF THE MATERIAL OF SAID STAY BOLTS AT A PREDETERMINED STRESSING VALUE HIGHER THAN THE MAXIMUM ROLLING PRESSURE, SO THAT IN OPERATION THE ACTUAL ROLL PRESSURE CAUSES ADDITIONAL ELONGATION OF OF SAID STAY BOLTS, AND A FLUID PRESSURE ADJUSTING MEANS CONNECTED BETWEEN A SOURCE OF FLUID PRESSURE AND SAID FLUID PRESSURE OPERATED MEANS, WHEREBY THE ELONGATION OF SAID STAY BOLTS WILL BE VARIED IN ACCORDANCE WITH VARIATIONS IN ROLL PRESSURE TO MAINTAIN THE ACCURACY OF WORK PIECES BEING ROLLED, IN THAT THE SUM OF THE ACTUAL ROLL PRESSURE AND THE ACTUAL ELONGATING FORCE AND THUS THE STRESS WITHIN SAID STAY BOLTS IS MAINTAINED SUBSTANTIALLY CONSTANT.