Magnetically weighted pressure rolls

Claim 1

IN A MAGNETIC PRESSURE ROLL SET COMPRISING A FIRST ROLL WITH CYLINDRICAL PERMANENT MAGNET MEANS THEREIN, MAGNETIC POLE PIECES AT THE ENDS OF THE MAGNET, A HOLLOW CYLINDRICAL OUTER SHELL OF UNIFORM CROSS-SECTION CLOSELY SURROUNDING AND ENCLOSING SAID MAGNET AND POLE PIECES, MEANS ROTATABLY MOUNTING SAID FIRST ROLL, AND A SECOND ROLL OF MAGNETIC CHARACTER ROTATABLY MOUNTED NEXT TO SAID FIRST ROLL FOR PRESSURE-CREATING COOPERATION THEREWITH BY INFLUENCE OF MAGNETIC FLUX FROM THE SAID MAGNET AND POLE PIECES OF SAID FIRST ROLL, THAT IMPROVEMENT IN WHICH SAID SHELL IN SAID FIRST ROLL IS OF FERROUS MATERIAL OF SUCH THIN CROSS-SECTION THAT SAID PERMANENT MAGNET MEANS MAINTAINS SAID SHELL IN MAGNETICALLY SATURATED CONDITION, SUFFICIENT RELUCTANCE THEREBY BEING PROVIDED MINIMIZING MAGNETIC FLUX LOSS POLE PIECE TO POLE PIECE AND SAID SHELL CONTAINING SAID MAGNET AND POLE PIECES AND CONSTITUTING THE SOLE STRUCTURAL SUPPORT OF THE SAME IN SAID ROLL AND OF SAID ROLL IN ITS MOUNTING.