Method and apparatus for regulating ink distribution in an undershot inking unit of a printing machine

US5493970A · kind A · utility

Assignee

• MAN Roland Druckmaschinen AG · DE

Inventors

• Achim Stoffler · Offenbach, DE
• Valentin Gensheimer · Frankfurt am Main, DE
• Edgar Werber · Offenbach, DE
• Marc Hinz · Rodenbach, DE
• Peter Hummel · Offenbach, DE
• Jurgen Wenzel · Düsseldorf, DE
• Albrecht Volz · Rödermark, DE
• Joachim Blumor · Großkrotzenburg, DE
• Hubert Zschetzsche · Offenbach, DE
• Manfred Straub · Offenbach, DE

Key dates

• Filing date: May 3, 1994
• Grant date: Feb 27, 1996
• Expiry date: May 3, 2014

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S101/32
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

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.