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Method for compensating for defective printing nozzles in an inkjet printing machine

An inkjet printer and nozzle technology, applied in printing, printing devices, transfer materials, etc., can solve the problems of expensive, complex control of double units, interference, etc., and achieve the effect of increasing consumption

Active Publication Date: 2019-08-27
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although effective, this is also correspondingly expensive, requires additional installation space and leads to further problems: eg more complicated control of the double unit
Furthermore, it has been found to be disadvantageous that the printing positions and amplitudes (ie printing intensity) of further adjacent printing nozzles are not taken into account when compensating by means of increased ink ejection volumes of adjacent printing nozzles, since this results in Interference occurs in rasterized printed images

Method used

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  • Method for compensating for defective printing nozzles in an inkjet printing machine
  • Method for compensating for defective printing nozzles in an inkjet printing machine
  • Method for compensating for defective printing nozzles in an inkjet printing machine

Examples

Experimental program
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Embodiment Construction

[0027] A preferred field of application for implementing the variant is the inkjet printer 7 . exist figure 1 An example of the basic structure of such a machine 7 is shown in , comprising: the feeder 1 for feeding the printing substrate 2 into the printing mechanism 4 up to the receiver 3, in which the print head 5 pairs the printing substrate 2 Substrate 2 printed.

[0028] This is a sheet inkjet printing press 7 , which is controlled by a control computer 6 . During operation of the printing press 7 , as described above, individual printing nozzles in the printing heads 5 of the printing unit 4 can fail. The result is then "white lines" 9, or distorted color values ​​in the case of multicolor printing. exist figure 2 An example of such a "white line" 9 in a printed image 8 is shown in .

[0029] exist image 3 An example of a printing press system 15 for use is shown in . In addition to the printing press 7 itself, the printing press system 15 also includes an image...

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PUM

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Abstract

The invention relates to a method for compensating for defective printing nozzles (11) in an inkjet printing machine (7) by way of a computer (6,19). Defective printing nozzles are compensated for byan increased ink drop volume of neighboring printing nozzles (11) and the real positions of the print dots of all printing nozzles (11) are determined and, to compensate for a printing nozzle failure,the required ink drop volumes of the respective neighboring printing nozzles (13,14) are calculated for every printing nozzle as a function of the real positions of the print dots of the respective neighboring printing nozzles. In addition to increased ink drop volumes of the respective neighboring printing nozzles (13), reduced ink drop volumes are calculated for the respective next but one printing nozzles (14) and all ink drop volumes are calculated based on the print dots of the respective printing nozzles.

Description

technical field [0001] The invention relates to a method for compensating for faulty printing nozzles in an inkjet printer. [0002] The invention is based on the technical field of digital printing. Background technique [0003] Typically, an inkjet printer includes one or more print heads, and each print head includes a plurality of print nozzles. These inkjet printers use nozzles for printing by ejecting ink. Such printing machines have nozzle plates with a specific arrangement of individual nozzles. In the event of a failure of an individual printing nozzle, which is also referred to as a “missing nozzle”, areas result that cannot be imaged by the individual color-separated nozzles provided for this purpose. This results in colorless regions which can be shown as "White Lines". If multicolor printing is involved, the corresponding color is missing at this location and the color values ​​are distorted (verzerrt). It should also be noted that the jet curves of the ind...

Claims

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Application Information

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IPC IPC(8): B41J2/135B41J2/165B41J2/175B41J29/393B41J29/38
CPCB41J2/135B41J2/165B41J2/175B41J29/393B41J29/38B41J2/2146B41J2/2139B41J2025/008H04N1/4015B41J2/0451B41J2/04586
Inventor A·豪克M·迈尔I·特拉莎娜斯
Owner HEIDELBERGER DRUCKMASCHINEN AG
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