Man Roland Druckmaschinen Ag

Man Roland Druckmaschinen

Manfred Straub

Peter Hummel

Valentin Gensheimer

Albrecht Volz

Joachim Blumor

Achim Stoffler

Jurgen Wenzel

Marc Hinz

Hubert Zschetzsche

Edgar Werber

Peter Mayer

Arno Gartner

Andreas Boehme

Jurgen Heinen

An undershot inking unit and associated method are disclosed. The undershot inking unit includes an ink fountain roller that is controlled independently of the printing speed of the printing machine, and in which the rotational contact angle of the distributor roller on the ink fountain roller is varied according to the printing unit speed. The method comprises controlling the rotational speed of the ink fountain roller independently of the printing speed of the printing machine; and varying the rotational contact angle of the intermittent ductor roller on the ink fountain roller according to the printing speed of the printing machine. In a preferred embodiment, the apparatus includes two coaxial cams rotatably adjustable with respect to each other. Each cam includes a predominant circumferential contour and a subordinate circumferential contour. By adjusting the relative rotational position of the cams, the rotational contact angle of the ductor roller on the ink foundation roller is varied according to the printing unit speed.

Method and apparatus for regulating ink distribution in an undershot

An apparatus for cleaning a roller nip in rotary printing machines, which is filled with a fluid, includes at least one nozzle arranged above the liquid in the nip with the nozzle oriented at an angle (.alpha.) with respect to the longitudinal direction of the nip so as to be directed towards the fluid. Blowing air is fed to the nozzle via a control valve and causes the fluid to flow along the nip and off at least one end of the rollers.

Apparatus for cleaning a roller nip in rotary printing machines

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Offenbach, Germany

Manfred Straub