Compensation method for failed printing nozzles

A nozzle, fault technology, applied in printing, transfer materials, copy/marking methods, etc., can solve problems such as insufficient compensation

Active Publication Date: 2019-03-05
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it is clear in practice that this scheme is often not good enough to compensate for the occurrence of "white lines"

Method used

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  • Compensation method for failed printing nozzles
  • Compensation method for failed printing nozzles
  • Compensation method for failed printing nozzles

Examples

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Embodiment Construction

[0030] A preferred field of application for implementing the variant is an inkjet printer 7 . exist figure 1 An example of the basic structure for such a machine 7 is shown in , which comprises a feeder 1 up to a receiver 3 for transporting a printing substrate 2 into a printing unit 4 in which a print head 5 pairs Substrate 2 is printed. This is a sheet inkjet printing press 7 , which is controlled by a control computer 6 . However, the method according to the invention can also be used for other types of digital printing machines 7 . During the operation of these printing presses 7 , failures of individual printing nozzles in the printing heads 5 of the printing units 4 can occur (as described above). The result is then "white lines" 9, or distorted color values ​​in the case of multicolor printing. figure 2 An example of such a "white line" 9 in a printed image 8 is shown in .

[0031] exist Figure 6 A preferred implementation variant of the method according to the ...

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PUM

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Abstract

The present invention relates to a method to correct for defective printing nozzles in an ink jet printing machine (7) via a computer (6). The defective printing nozzles are compensated for after thescreening process by neighboring printing nozzles applying an increased amount of ink. The method includes the steps of: precalculating different compensation halftones (10) for different area coverages by the computer (6), printing the compensation halftones (10) embedded in area coverage halftone areas (11), evaluating the printed compensation halftones (10) via the computer (6), and selecting and saving, for every area coverage level, the compensation halftone (15) that best matches the coloration of the original halftone in the respective area coverage halftone area (11). A defective printing nozzle is detected during production printing by the computer (6). The local area coverage is determined along the detected defective printing nozzle by the computer (6). The compensation halftone(15) that has been saved for the determined local area coverage is used to compensate for the defective printing nozzles via the computer (6).

Description

technical field [0001] The invention relates to a method for correcting faulty printing nozzles in an inkjet printing press by means of a compensation grid. Background technique [0002] The present invention is in the technical field of digital printing. [0003] In digital printing, more precisely in inkjet printing, the problem of printing nozzles that do not function properly enough or fail completely, especially in industrial large-format printing, is of major importance for the print quality to be achieved. question. Here, these faulty printing nozzles (also referred to as "missing nozzles") have various causes and manifestations. Most of these malfunctioning print nozzles are caused by the dry ink left over from previous print jobs clogging these print nozzles. Further technical reasons may lie in problems with the ink supply to the individual nozzles or with the electrical control of the individual nozzles. [0004] The influence of such "missing nozzles" on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41M5/00
CPCB41M5/00B41J2/04593B41J2/2139B41J2/2146B41J2025/008B41J2/0451B41J2/04586
Inventor I·特拉莎娜斯M·迈尔P·哈赫曼
Owner HEIDELBERGER DRUCKMASCHINEN AG
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