Patent · US Expired

Process and device for determining registration errors

US6718879B2 · kind B2 · utility

6Cited by

3References

2Claims

0Family size

Assignee

NexPress Solutions LLC · US

Inventors

Ingo Dreher · Kiel, DE
Heiko Hunold · Wattenbek, DE
Patrick Metzler · Gettorf, DE
Stefan Schrader · Kiel, DE

Key dates

Filing date	Jul 30, 2002
Grant date	Apr 13, 2004
Priority date	—
Expiry date	Jul 30, 2022

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB41P2233/52
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

Determining and correcting registration errors, which are caused by the rotational speed of a print cylinder changing because of a sheet passing between the print cylinder and a sheet transport conveyor belt. At least one first registration mark is applied onto the conveyor belt prior to a sheet being transported thereby, and at least one second registration mark is applied onto the conveyor belt after the transported sheet. By the detection of the first registration mark and the second registration mark, a calculation of a timing number between the detection of the first registration mark and the second registration mark can be made. The calculated timing number is compared to a target value to determine any error due to change in angular velocity of the print cylinder due to engagement with the sheet.

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