Patent ID: 6705219
Filing Date: 2004-03-16
Classification: B41F,B41P

Abstract:
An offset printing unit for printing a material web, comprising:a first form cylinder for transferring a first color, said first form cylinder having a form cylinder diameter; a second form cylinder for transferring a second color, said second form cylinder having the form cylinder diameter; a plurality of guide rollers respectively disposed in a vicinity of said first and second form cylinders and of a material web to be imprinted, said guide rollers having a diameter smaller than the form cylinder diameter; an endless blanket belt disposed to revolve around said guide rollers and to form with said first and second form cylinders respective offset nips at which said blanket belt receives the first color from said first form cylinder and the second color from said second form cylinder, and to form an impression nip with the material web at which the material web receives the first and second colors from said endless blanket belts; a camera disposed at a location downline from said second form cylinder in a blanket belt travel direction, said camera recording a coverage of the first and second color on said endless blanket belt; and a computer connected to said camera and to said first and second form cylinders for setting a register of the first and second colors on said endless blanket belt in response to a signal received from said camera.