Patent · US Expired

Method of detecting register errors

US5247462A · kind A · utility

8Cited by

4References

8Claims

0Family size

Assignee

Heidelberger Druckmaschinen AG · DE

Inventors

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

Key dates

Filing date	May 8, 1991
Grant date	Sep 21, 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 providing the printed product with register marks respectively having two edges extending with opposite angles obliquely to a web travel direction, passing the printed product through a printing machine, and scanning the register marks opto-electrically with sensors which may have at least four sensor elements arranged substantially in a square.

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