Printing machine pre-setting arrangement

US4553478A · kind A · utility

Assignee

• MAN Roland Druckmaschinen AG · DE

Inventors

• Harry M. Greiner · Offenbach am Main, DE
• Hermann Fischer · Augsburg, DE
• Claus Simeth · Mühlheim, DE

Key dates

• Filing date: Jan 20, 1984
• Grant date: Nov 19, 1985
• Expiry date: Jan 20, 2004

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41F33/0027
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A system for presetting register and color zone adjusting devices in a multi-color rotary printing machine uses digitally-driven optical scanners axially traversing the plate cylinders under control of at least one numerical computer. Machine-specific characteristics are programmed in non-volatile memory as referenced values. Data processing is not required to be conducted external to the printing machine. The system is compact and requires practically no re-adjustment or entry of desired values from the machine operator. The machine operator, however, may enter coordinates for printing areas on the printing plate in order to speed up the scanning process for determining the initial color zone preset. The scanner multi-functionally scans the printing plate for both register adjustment and for integrating the ratio of printing to non-printing area for each inking zone. The system is easily reprogrammed and the optical scanner is interchangeable with a densitometer in order to provide alternative control functions during printing, such as the regulation of inking and dampening.