Removable pressure roller mechanism

Claim 1

IN A REMOVABLE PRESSURE ROLLER MECHANISM FEEDING PAPER THROUGH A MACHINE, THE COMBINATION OF A MAIN SHAFT; A PAIR OF LEFT ROLLER LINKS PIVOTALLY CARRIED BY THE SAID SHAFT, SAID LINKS BEING SPACED FROM THE LEFT END OF THE SAID SHAFT; A PAIR OF RIGHT ROLLER LINKS PIVOTALLY CARRIED BY THE SAID SHAFT, SAID LINKS BEING SPACED FROM THE RIGHT END OF THE SAID SHAFT; AN INPUT ROLLER ROTATIVELY SUPPORTED BETWEEN THE FORWARDMOST LEFT LINKS AND THE FORWARDMOST RIGHT LINKS; A DRIVEN OUTPUT ROLLER ROTATIVELY CARRIED BETWEEN THE OTHER OF SAID LEFT LINKS AND THE SECOND OF SAID RIGHT LINKS; SPRING MEANS BIASING THE SAID RIGHT AND LEFT LINKS RESPECTIVELY PIVOTALLY TOGETHER ABOUT THE SAID MAIN SHAFT; RELEASING MEANS BUILT INTO THE SAID MACHINE, SAID MEANS REMOVABLY SECURING THE SAID MAIN SHAFT, SAID MEANS UTILIZING THE BIAS OF THE SAID SPRING MEANS; AND A CYLINDRICAL CAM BAR TRANSVERSELY SECURED TO THE SAID MACHINE BENEATH THE SAID FORWARDMOST RIGHT AND LEFT LINKS, SAID CAM BAR BEING CUT TO PROVIDE FLAT BAR SECTIONS UNDERLYING THE SAID FORWARDMOST LINKS, SAID CAM BAR HAVING AN INITIAL POSITION WHEREIN THE ROUNDED SURFACE CONTACTS THE SAID FORWARD LINKS AND RAISES THEM AGAINST THE BIAS OF THE SAID SPRING MEANS, SAID CAM BAR HAVING A SECOND POSITION WHEREIN THE SAID FLAT BAR SECTIONS CONTACT THE SAID FORWARD LINKS THEREBY PERMITTING THE SPRING MEANS TO PULL THE ATTACHED INPUT ROLLER TO A LOWER POSITION.