Patent ID: 8807028

Claim:
A graphic arts die assembly for mounting on a graphic arts impression apparatus, said assembly comprising: a die plate formed at least partially of ferromagnetic material and including a die; and a chase including a plurality of magnet assemblies disposed along an engagement surface thereof, said die plate and magnet assemblies being configured to provide a magnetic coupling force for selectively securing the die plate to said engagement surface of the chase such that relative movement between the chase and the die plate is restricted during such magnetic securement, said chase including an actuatable releasing assembly operable to exert a disengagement force in opposition to the magnetic coupling force so as to selectively lift the die plate from the chase when the releasing assembly is actuated, thereby releasing the magnetic securement between the chase and the die plate and facilitating relative movement therebetween, said releasing assembly comprising a shiftable element with a die plate engaging portion operable to move between a recessed position, wherein the die plate engaging portion of the shiftable element is below the engagement surface of the chase, and an extended position, wherein the die plate engaging portion of the shiftable element extends above the engagement surface of the chase, said releasing assembly further including a drive system to move the shiftable element to the extended position, said disengagement force being exerted by the die plate engaging portion of the shiftable element when moved to the extended position, with the die plate engaging portion pushing upwardly against the die plate to lift the plate.