Dampening system for rotary offset press

Abstract

Abstract A DAMPENING DEVICE FOR AN OFFSET-TYPE ROTARY PRINTING PRESS IN WHICH A DRIVEN TRANSFER ROLLER, PARTIALLY IMMERSED IN A DAMPENING FLUID, APPLIES A FILM OF DAMPENING FLUID TO A DRIVEN DAMPENED ROLLER WITH WHICH IT COACTS. A METERING ROLLER HAVING A RESILIENT AND DEFORMABLE SURFACE COACTS WITH THE TRANSFER ROLLER WITH SUFFICIENT PRESSURE BETWEEN THEM TO DEFORM THE METERING ROLLER INWARDLY SO THAT THE THICKNESS OF THE FILM OF DAMPENING FLUID IS MAINTAINED UNIFORM PERIPHERALLY AND AXIALLY OF THE TRANSFER ROLLER REGARDLESS OF OUT-OF-ROUNDNESS OF THE TRANSFER ROLLER AND FLEXURE OF THE TRANSFER AND METERING ROLLERS. THE DEVICE IS PROVIDED WITH A DRIVE THAT ALLOWS THE DRIVEN DAMPENED ROLLER TO DRIVE THE TRANSFER ROLLER VARIABLY IN DEPENDENCE UPON CHANGES OF THE THICKNESS OF THE FILM OF DAMPENING FLUID BETWEEN THE DAMPENED ROLLER AND THE TRANSFER ROLLER. THE DAMPENED ROLLER WILL VARY THE SPEED OF THE TRANSFER ROLLER SO THAT IT INCREASES OR DECREASES THE THICKNESS OF THE FILM OF DAMPENING FLUID THEREON AS A FUNCTION OF ITS SPEED CHANGES SO THAT THE FILM THICKNESS IS MAINTAINED CONSTANT AUTOMATICALLY.

Inventors

• 👤 Louis Jean Chambon

Bibliographic Details