Patent ID: 6112660
Filing Date: 2000-09-05
Classification: B41F

Abstract:
In a printing press having a main drive and a printing unit with an ink fountain, a fountain roller receiving ink from the ink fountain, a first ink roller spaced apart from the fountain roller, a plate cylinder; and an improved assembly for providing exactly metered transfer of printing ink in the printing press comprising:a ductor roller for receiving an amount of ink from the fountain roller, the amount of ink defining an ink strip width;a swivel mechanism having a dedicated, discontinuous drive for swiveling said ductor roller back and forth between the fountain roller and the first ink roller, said discontinuous drive independently operable of the main drive of the printing press;an incremental encoder associated with the plate cylinder of the printing unit for registering a rotational speed and an angular position of the plate cylinder of the printing unit;a set point generator connected to said discontinuous drive and to said incremental encoder for receiving values of the ink strip width, a speed of said ductor roller, a phase angle between said ductor roller and the plate cylinder of the printing unit, and the rotational speed and angular position of the plate cylinder of the printing unit, said set point generator receiving the rotational speed and the angular position of the plate cylinder of the printing unit from said incremental encoder and using the values of the ink strip width, the speed of said ductor roller, the phase angle between said ductor roller and the plate cylinder of the printing unit, and the rotational speed and angular position of the plate cylinder of the printing unit to calculate set points for said discontinuous drive for swiveling said ductor roller and supplying the set points to said discontinuous drive.