Arrangement for securing pure skew adjustment of a plate cylinder in a sheet-fed rotary printing press

Claim 1

An arrangement for securing pure skew adjustment of a cylinder, for example, a plate cylinder in a sheet-fed rotary printing press, relative to an adjacent cylinder, comprising, in combination, a frame including side plates, first and second cooperating cylinders having their axes normally arranged in a plane and journalled in the side plates of the frame, the first cylinder having a drive end and a remote end and having stub shaft projecting coaxially therefrom, a bearing at the drive end, a bearing assembly at the remote end fitted within a cylindrical opening in the frame, said bearing assembly including a cylinder bearing telescoped over the shaft and having flat support surfaces thereon facing radially outward in opposite directions, a guide bearing having a cylindrical outer surface and having a central window extending axially therethrough for receiving the cylinder bearing, the window defining a pair of flat way surfaces facing radially inward and spaced parallel to one another for snug reception of the flat support surfaces on the cylinder bearing, the window also defining side walls spaced apart sufficiently to permit freedom of adjustment of the cylinder bearing along the way surfaces, an eccentric sleeve fitted between the opening in the frame and the cylindrical outer surface of the guide bearing, means for rockably adjusting the eccentric sleeve to move the first cylinder toward and away from the second cylinder thereby to vary the degree of impression between them, adjusting means for positioning the cylinder bearing with respect to the way surfaces thereby to adjustably skew the first cylinder with respect to the second, and means secured to the frame for holding the guide bearing in a phase position in which the way surfaces therein are constantly oriented perpendicular to the plane which contains the axes of the cylinders notwithstanding the rocking movement of the sleeve.