Patent ID: 6584902
Filing Date: 2003-07-01
Classification: B41F

Abstract:
In a rotary printing press having a liquid form roller for receiving a liquid from a liquid supply cylinder and applying the liquid to a plate cylinder, the liquid form roller and the liquid supply cylinder and the plate cylinder being all rotatable about axes that are parallel to one another, the combination thereof with:(a) a first pair of roller support members mounted one adjacent each end of the liquid supply cylinder for angular displacement relative to the same about the axis of the liquid supply cylinder; (b) a second pair of roller support members mounted respectively to the first pair of roller support members for pivotal motion relative to the same about an axis parallel to the axis of the liquid supply cylinder, the second pair of roller support members rotatably supporting therebetween the liquid form roller for rolling contact with both the liquid supply cylinder and the plate cylinder; and (c) adjustment means acting between the first and the second pair of roller support members for adjustably causing the pivotal motion of the second pair of roller support members relative to the first pair of roller support members and hence for adjustably varying the width of a nip between the liquid supply cylinder and the liquid form roller; (d) the liquid form roller when in rolling contact with both the liquid supply cylinder and the plate cylinder having its axis positioned so close to a plane containing both the axis of the pivotal motion of the second pair of roller support members relative to the first pair of roller support members and the axis of the plate cylinder, and the axis of the pivotal motion of the second pair of roller support members relative to the first pair of roller support members being positioned so close to a plane tangent to both the liquid supply cylinder and the liquid form roller at the nip therebetween, that the width of the nip between the liquid supply cylinder and the liquid form roller is adjustably variable by the adjustment means without substantially varying the width of the nip between the liquid form roller and the plate cylinder; (e) whereby the rate of liquid transfer from the liquid supply cylinder to the plate cylinder is finely readjustable by the adjustment means.