Man Roland Druckmaschinen Ag

Man Roland Druckmaschinen

Achim Stoffler

Peter Hummel

Valentin Gensheimer

Robert Ortner

Albrecht Volz

Joachim Blumor

Jurgen Wenzel

Marc Hinz

Hubert Zschetzsche

Manfred Straub

Edgar Werber

Paul Abendroth

Janko Despot

Joachim Muller

Peter Schramm

Karl-Heinz Franz

Joachim Herzel

Joachim Steuer

Alexander Kluh

A method and a corresponding control are described for the start-up of production printing in a sheet-processing printing machine, in particular, a sheet-fed offset printing machine, in which ink is supplied via a vibrating roller which is movable back and forth between an ink fountain roller and a ink distribution roller wherein clearance is given for the entry into the machine of a first sheet to be printed as a function of the state of movement of the vibrating roller. When production printing is resumed, the state of movement of the vibrating roller for clearance for the sheet entry is selected from a memory as a function of the state of movement of the vibrating roller during entry of a last sheet into the machine before the commencement of the print interruption.

System and method for optimally controlling the restart of a sheet-fed

An undershot inking unit for a printing machine and a method for regulating ink distribution in a printing machine are disclosed. The undershot inking unit comprises an ink fountain roller communicating with an ink fountain, an inking roller, and an intermittent ductor roller for transferring ink from the ink fountain roller to the inking roller. In accordance with the present invention, the ductor roller is thrown onto the ink fountain roller at a rate that is independent of the printing speed of the printing machine, preferably, at a rate that is constant for all printing speeds. The disclosed apparatus and method alleviate the problem of ink fall-off in printing machines.

Apparatus and method for regulating ink distribution in a printing

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

A mounting device is provided for an ink duct of a printing press wherein the ink duct is supported primarily on the press frame so as to be pivotally movable with respect to a ductor roller. The ink duct carries a first guide roller which engages the ductor roller in substantially the same plane as the ink metering elements disposed in the ink duct and the ink duct carries a second guide roller which engages the ductor roller substantially vertically above its center line. A link pivoted to the ink duct carries a third guide roller which is normally biased into engagement with the ductor roller at a position disposed from the first guide roller by at least 180.degree. measured peripherally around the ductor roller through the second guide roller. An unlocking mechanism swings the third guide roller out of engagement with the ductor roller so as to permit pivotal movement of the ink duct and guide rollers away from the ductor roller.

Ink metering apparatus with pivotally engageable ink duct

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Offenbach, Germany

Achim Stoffler