Knife holder of roller cutting machines

Claim 1

A PRESSURE MEDIUM-ACTUATED KNIFE HOLDER OF A ROLLER CUTTING MACHINE, SAID KNIFE HOLDER COMPRISING, IN COMBINATION WITH A SINGLE CIRCULAR KNIFE, A HUB CARRYING SAID KNIFE, A PISTON ROD CONNECTED WITH SAID HUB AND EXTENDING TRANSVERSELY TO SAID CIRCULAR KNIFE FOR THE SIDE SETTING OF SAID KNIFE, A PISTON CONNECTED WITH SAID PISTON ROD, A SPRING ENGAGING SAID PISTON, A CASING ENCLOSING SAID PISTON AND SAID SPRING AND HAVING A PRESSURE CHAMBER, ANOTHER PISTON ROD CONNECTED WITH SAID CASING AND EXTENDING SUBSTANTIALLY PERPENDICULARLY TO THE FIRST-MENTIONED PISTON ROD, ANOTHER PISTON CONNECTED WITH THE SECONDMENTIONED PISTON ROD AND MOVABLE FROM A POSITION OF REST FOR THE LOWERING OF SAID KNIFE, ANOTHER SPRING ENGAGING THE SECOND-MENTIONED PISTON, ANOTHER CASING ENCLOSING THE SECOND-MENTIONED PISTON AND THE SECOND-MENTIONED SPRING AND HAVING A PRESSURE CHAMBER AND A SINGLE PRESSURE MEDIUM INLET COMMUNICATING WITH THE SECONDMENTIONED PRESSURE CHAMBER, THE SECOND-MENTIONED PISTON ROD HAVING AN AXIAL BORE COMMUNICATING WITH THE FIRST-MENTIONED PRESSURE CHAMBER AND A RADIAL VALVE BORE COMMUNICATING WITH SAID AXIAL BORE, SAID RADIAL VALVE BORE BEING DEVOID OF COMMUNICATION WITH THE SECONDMENTIONED PRESSURE CHAMBER WHEN THE SECOND-MENTIONED PISTON ROD IS IN ITS SAID POSITION OF REST AND ESTABLISHING A COMMUNICATION WITH THE SECOND-MENTIONED PRESSURE CHAMBER WHEN THE SECOND-MENTIONED PISTION IS LOWERED FROM SAID POSITION OF REST TO SUPPLY THE PRESSURE MEDIUM THROUGH SAID SINGLE INLET TO THE TWO PRESSURE CHAMBERS, THE TWO SPRINGS BEING OF SUCH STRENGTH THAT WHEN PRESSURE MEDIUM IS INTRODUCED THE LOWERING OF SAID KNIFE TAKES PLACE PRIOR TO THE SIDE SETTING THEREOF, WHILE WHEN PRESSURE OF THE PRESSURE MEDIUM IS RELEASED A REVERSE SIDE MOVEMENT OF THE KNIFE TAKES PLACE PRIOR TO THE RAISING THEREOF, AND AT LEAST ONE PLATE SPRING ADJUSTABLY ENGAGING SAID KNIFE AND SAID HUB.