Abstract: A hydra-jack screw apparatus is provided for exerting a force against an object, for adjusting the magnitude of the force exerted against the object, and for providing a visual indication of the magnitude of the force exerted against the object. The apparatus is comprised of a base member housing a piston chamber, a jack screw extending from the bottom of the base member, a fluid pressure gauge mounted on the base member, and a pair of pistons received in the piston chamber for reciprocating movement. One of the pistons has a piston rod that extends through a center bore of the jack screw and engages against an object against which a force is to be applied. The second piston has a piston rod that extends from the piston chamber of the base member and is attached to a manual forced adjusting knob. A volume of fluid is contained in the piston chamber between the first and second pistons, and as the manual knob is turned, the pressure of the volume of fluid is adjustably increased or decreased.

Abstract: A rotary cutting die assembly comprised of a mandrel adapted to be rotatably mounted in a rotary die cutting press, and a cylindrical cutting sleeve and drive gear slip fit over the mandrel, provide a method and apparatus for replacing the cutting edge of a rotary cutting die at a reduced cost for materials, manufacturing and shipping than that associated with conventional rotary cutting die replacement.

Abstract: A rotary hole punching die assembly comprises a plurality of hole punch inserts mounted in radial holes circumferentially spaced around a punch wheel. A retainer ring having a plurality of projecting cogs engages the plurality of hole punch inserts and retains the inserts on the punch wheel. A clamping collar and key are assembled with the punch wheel and retainer ring on a rotary mandrel, and secure the punch wheel and retainer ring against axial and rotational movement relative to the mandrel. The rotary hole punching die assembly prevents any one hole punch insert from being disassembled from the assembly without removing the entire assembly from the rotary mandrel, and the entire assembly cannot be removed from the mandrel without first removing the mandrel, along with the assembly, completely from the rotary press.