Winding apparatus

Claim 1

IN AN APPARATUS FOR WINDING AND UNWINDING SHEET MATERIAL AND INCLUDING SPACED COMPANION SUPPORTS, AN AXLE JOURNALED IN THE SUPPORTS AND A PAIR OF WEB ROLL CARRYING ARMS MOUNTED ON SAID AXLE FOR ROTATION; THE IMPROVEMENT COMPRISING A HOUSING PROVIDED AT THE END OF ONE OF SAID ARMS AND ARRANGED TRANSVERSELY THEREOF AND PARALLEL WITH THE AXLE, SAID HOUSING HAVING OPEN ENDS, HEAD MEMBERS REMOVABLY SECURED TO AND CLOSING OFF SAID OPEN HOUSING ENDS AND HAVING AXIALLY ALIGNED CENTER OPENINGS, A SPINDLE SLIDABLY DISPOSED COAXIALLY IN THE HOUSING AND SEALINGLY AND SLIDABLY EXTENDING THROUGH THE OPENINGS IN THE HEAD MEMBERS, A PISTON PROVIDED ON THE SPINDLE AND SEALINGLY SLIDABLE IN THE HOUSING, SAID HEAD MEMBERS HAVING PORTS FORMED THERETHROUGH AND COMMUNICATING AT THEIR INNER ENDS WITH THE INTERIOR OF THE HOUSING ON OPPOSITE SIDES OF THE PISTON, FLUID LINES COMMUNICATING WITH THE PORTS AT THEIR OUTER ENDS FOR THE INTRODUCTION INTO AND REMOVAL FROM OF PRESSURE FLUID IN THE HOSING TO ACT ON OPPOSITE FACES OF THE PISTON, CONTROL MEANS CARRIED BY THE ARM FOR CONTROLLING THE FLOW OF FLUID IN THE LINES, SAID SPINDLE HAVING AN ENLARGED END EXTENDING BEYOND THE HOUSING AND LOCATED BETWEEN THE SUPPORTS, SAID SPINDLE END HAVING A CAVITY, A CHUCK ELEMENT ROTATABLY MOUNTED IN SAID CAVITY, MEANS FOR ROTATABLY MOUNTING THE CHUCK ELEMENT IN THE CAVITY, A REMOVABLE COVER PLATE CLOSING OFF THE CAVITY AND HAVING AN OPENING THROUGH WHICH THE CHUCK ELEMENT ROTATABLY EXTENDS TO CLAMPINGLY ENGAGE ONE END OF A ROLL OF SHEET MATERIAL.