Arrangement for prevention of roller marks on roller units in a printing press

US4495863A · kind A · utility

Assignee

• MAN Roland Druckmaschinen AG · DE

Inventors

• Janko Despot · Offenbach am Main, DE
• Paul Abendroth · Offenbach am Main, DE

Key dates

• Filing date: Mar 7, 1983
• Grant date: Jan 29, 1985
• Expiry date: Mar 7, 2003

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41F13/26
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

In a rotary printing machine, an arrangement for mounting an applicator roller and a preceding roller in a fluid feed stream journals the applicator roller and the preceding roller to the printing machine frame with substantial bearing play, and spring loads the applicator roller against the bearing surface away from the plate cylinder. On passing through the cylinder gap the applicator rollers of inking, damping or varnishing units in sheet-fed offset presses are jolted both at the start and end of the gap. The resulting different flattening of the soft applicator rollers causes roller marks, which should be avoided. For this purpose the applicator roller and the preceding roller are braced against each other by springs, so that their bearing play is eliminated and the distance between shafts is constant. This condition is also maintained on passage through the gap. Conveyance of liquid between applicator rollers and the preceding rollers is thus constant.