Patent · US Expired

Method and apparatus for detecting register errors on a printed product provided with register marks

US5249139A · kind A · utility

8Cited by

5References

5Claims

0Family size

Assignee

Heidelberger Druckmaschinen AG · DE

Inventors

Uda Blasius · Leimen, DE
Manfred Korinek · Sinsheim, DE
Jurgen Reithofer · Schallstadt, DE

Key dates

Filing date	May 8, 1991
Grant date	Sep 28, 1993
Priority date	—
Expiry date	May 8, 2011

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB41F33/0081
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

A method of detecting register errors on a printed product, includes forming register marks on the printed product, pressing the printed product through a printing machine, opto-electrically scanning the register marks twice in a web travel direction with a predetermined time interval between the scannings, generating respective signals in accordance with the scannings, subtracting the signals from one another to obtain a further signal, and determining the position of the register mark as a measure of a time-dependent position of an extreme value of the further signal; and apparatus for performing the method.

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