Patent · US Expired

Printing process diagnostic method and system for a rotary printing press, using diffuse reflection of solid-print and half-tone fields

US5258925A · kind A · utility

17Cited by

11References

21Claims

0Family size

Assignee

MAN Roland Druckmaschinen AG · DE

Inventors

Werner Maier · Schifferstadt, DE
Hans Mamberer · Königsbrunn, DE
Armin Weichmann · Kissing, DE

Key dates

Filing date	Feb 5, 1991
Grant date	Nov 2, 1993
Priority date	—
Expiry date	Feb 5, 2011

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB41F33/0036
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

A method for detecting diffuse reflections of full-tone and half-tone fields in order to prepare diagnoses on problem factors and/or changes in process parameters, such as blurring, dampness, machine temperature. During printing, the diffuse reflections of the full-tone and half-tone fields are detected with scanners. This is done in such a way that for at least two printed copies, in at least two fields of each copy, the diffuse reflections of full-tone and half-tone areas, or of at least two half-tone fields of different area coverages are compared, and based on the results of this comparison, diagnoses and/or control recommendations are made.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.