Magnetic feed roll system

Claim 1

A FEED ROLL SYSTEM FOR FEEDING LARGE SHEETS OF SHEET METAL ALONG A DESIRED FEED PATH HAVING A SERIES OF ROLLERS ON WHICH THE STREETS REST, SAID SYSTEM COMPRISING A MAGNETIC FED ROLL ON ONE SIDE OF THE FEED PATH, A FERROMAGNETIC PINCH ROLL ON THE OTHER SIDE OF THE FEED PATH, MEANS MOUNTING BOTH ROLLS FOR ROTATION, MOTOR MEANS TO DRIVE ONE OF THE ROLLS, SAID ROLLS BEING SO MOUNTED AS TO BE RELATIVELY MOVABLE TOWARD OR AWAY FROM ONE ANOTHER TO PINCH A SHEET DIRECTLY THEREBETWEEN, SAID PINCH ROLL SERVING TO COMPLETE THE MAGNETIC CIRCUIT OF THE FEED ROLL WHEN FEEDING THIN OR NON-FERROUS SHEET METAL, SAID FEED ROLL COMPRISING TWO SPACED FERROMAGNETIC DISCS SECURED ON A FERROMAGNETIC SHAFT WITH AN ELECTROMAGNETIC COIL BETWEEN SAID DISCS, SAID ELECTROMAGNETIC COIL BEING HOUSED IN A NONMAGNETIC AND NONROTATABLE HOUSING POSITIONED AROUND THE FERROMAGNETIC SHAFT, AND BEING ENERGIZED THROUGH FIXED WIRING, THEREBY ELIMINATING THE NEED FOR SLIP RINGS.