Patent ID: 7325287

Claim:
An apparatus for minimizing registration errors when mounting a plate cylinder in a subsystem of an optical disc printing system, the subsystem including a drive member, an expanding mandrel attached to the drive member, and an imaging drum adapted to slide over the mandrel, said apparatus comprising: a locating member attached to an end of the imaging drum facing away from the drive member; and a clamping tool including spring-loaded handles, a plurality of arms, and a locating sleeve integrally attached to an outer surface of one of the clamping tool arms, wherein said clamping tool is adapted to grip the mandrel, and when the clamping tool gripping the mandrel is in a locating position such that the clamping tool engages the imaging drum and the locating sleeve of the clamping tool engages said locating member, said clamping tool is moved by an operator of the optical disc printing system in a rotational direction relative to an axis of the mandrel, allowing the locating sleeve to remain engaged to the locating member and causing the imaging drum to rotate in a similar direction, while the clamping tool holds securely to the mandrel in a radial direction and pressure is applied by the clamping tool against said end of the imaging drum in an axial direction towards the drive member, until the imaging drum is brought to a final position.