REGISTER CONTROL APPARATUS FOR CONTROLLING BOTH AXIAL AND CIRCUMFERENTIAL REGISTER OF A PLATE CYLINDER

摘要

The register control apparatus includes a ring member coaxially positioned on a hub portion of the plate cylinder shaft. A drive gear is coaxially positioned on the ring member and drivingly connected thereto. The hub, ring, and drive gear are axially fixed on the plate cylinder shaft and the ring member is rotatable relative to the hub member by means of a circumferential register adjusting apparatus that includes a pair of spline members slidable longitudinally in slots of the hub member and a pair of key members positioned in slots in the ring member. The key members have an upper key portion extending into slots in the slidable splines. The slots and key portion extend angularly relative to the shaft periphery at the same helix angle as the helical gear teeth of the drive gear and in the opposite direction. The lower portion of the key member has arcuate side walls that mate with arcuate side walls of the longitudinal slots in the ring. By axially moving the splines relative to the plate cylinder shaft the hub and plate cylinder are rotated relative to the drive gear to thus change the circumferential register of the plate cylinder. The plate cylinder shaft is rotatably supported in a bearing housing that is axially fixed to the plate cylinder shaft. Apparatus is provided to move the bearing housing axially in the press frame to thus move the cylinder axially and adjust the side register.