Inking unit with traversing ink rollers

US4397236A · kind A · utility

Assignee

• MAN Roland Druckmaschinen AG · DE

Inventors

• Harry M. Greiner · Offenbach am Main, DE
• Roland Holl · Weiterstadt, DE
• Klaus Neberle · Heusenstamm, DE
• Paul Abendroth · Offenbach am Main, DE

Key dates

• Filing date: Aug 17, 1981
• Grant date: Aug 9, 1983
• Expiry date: Aug 17, 2001

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S101/38
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

An inking unit for a printing press including a source of ink, a set of ink transfer rollers for establishing an ink film, a distributor roller vibrated endwise for distribution of the ink film and a form roller for applying the ink film to a plate on the plate cylinder. The form roller has a shaft and an outer cylindrical shell, the latter being rotated by surface engagement. A bearing between the shaft and the shell permits relative axial as well as rotational movement. A cam of the cylindrical, or drum, type mounted on the shaft has an endless wavy groove in which is received a cam follower in the form of a roller extending radially inwardly from the sleeve so that the sleeve reciprocates through a single cycle as a result of a single relative rotation of the shaft. The shaft is driven at a speed which causes the frequency of vibration of the form roller to differ from the frequency of vibration of the distributor roller so that the ghost image on the form roller is constantly being displaced and dissipated both peripherally and axially with respect to the image on the plate resulting in substantially ghost-free printing. A clutch is provided for remote switching between two mod…