Abstract: A device for securing blades on perforation and cutting cylinders for graphic arts machinery including two complementary rules which engage together and a pneumatic chamber arranged longitudinally between the two rules. The pneumatic chamber is inflated and causes the rules to separate slightly from each other and compress a blade arranged between at least one of the rules and the walls of a groove of the cylinder in which the device is situated. The pneumatic chamber is connected to a passageway through which a continuous supply of compressed air is provided in order to maintain the pressure in the pneumatic chamber. The device also includes elastic blocks which dampen impacts and noise, and other blocks to prevent regulation screws from loosening.