Patent · US Active

Method for detecting and compensating for failed printing nozzles in an inkjet printing machine

US10214017B2 · kind B2 · utility

3Cited by

2References

11Claims

0Family size

Assignee

Heidelberger Druckmaschinen AG · DE

Inventors

Wolfgang Geissler · Bad Schönborn, DE
Martin Mayer · Ladenburg, DE
Frank Muth · Karlsruhe, DE
Hans Koehler · Graz, AT

Key dates

Filing date	Dec 11, 2017
Grant date	Feb 26, 2019
Priority date	—
Expiry date	Dec 11, 2037

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB41J2025/008
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

A method for detecting and compensating for failed printing nozzles in an inkjet printing machine by using a computer, includes printing a current print image, recording the printed print image by using an image sensor and digitizing the recorded print image by using the computer, adding digitized color values of the recorded print image of every column over the entire print image height and dividing the added-up color values by the number of pixels to obtain a column profile, subtracting an optimized column profile without failed printing nozzles from the original column profile to obtain a differential column profile, setting a maximum value threshold defining a failed printing nozzle when exceeded, applying that maximum value threshold to the differential column profile to obtain a resultant column profile every maximum of which marks a failed printing nozzle. The marked printing nozzles are compensated in a subsequent printing operation.

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