2. IN A CLOTH SHEARING MACHINE, A ROTATABLY MOUNTED CYLINDER HAVING A PLURALITY OF SPACED SHEARING BLADES EXTENDING LONGITUDINALLY THEREOF AT ITS PERIPHERY, A LEDGER KNIFE DISPOSED LONGITUDINALLY OF THE CYLINDER AND HAVING ONE LONGITUDINAL MARGIN IN SHEARING RELATION WITH SAID BLADES, MEANS INCLUDING A SUPPORT MOUNTING THE LEDGER KNIFE FOR PIVOTAL MOVEMENT ABOUT AN AXIS REMOTE FROM SAID MARGIN AND PARALLEL WITH THE ROTARY AXIS OF THE CYLINDER AND DISPOSED TO PIVOT SAID MARGIN REARWARDLY AWAY FROM SAID BLADES, ADJUSTABLE STOP MEANS FOR LIMITING FORWARD PIVOTAL MOVEMENT OF THE LEDGER KNIFE TOWARD SAID