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Method for compensating for faulty printing nozzles in an inkjet printer

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

Active Publication Date: 2020-12-22
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 faulty printing nozzles in an inkjet printer
  • Method for compensating for faulty printing nozzles in an inkjet printer
  • Method for compensating for faulty printing nozzles in an inkjet printer

Examples

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Comparison scheme
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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 a faulty printing nozzle (11) in an inkjet printing press (7) by means of a computer (6, 19), wherein the faulty printing nozzle (11) is passed through an adjacent printing nozzle (13). Compensate for the increased droplet volume, and obtain the true position of the printing dots of all printing nozzles, and for each printing nozzle, in order to compensate for its failure, calculate the respective adjacent printing points according to the true position of the printing dots of each adjacent printing nozzle. Necessary drop volume of printing nozzles (13, 14), characterized in that, in addition to the increased drop volume of the respective adjacent printing nozzle (13), the decreasing drop volume of the respective subsequent printing nozzle (14) is calculated Volume, and the total ink droplet volume is calculated based on the printing point of the corresponding printing nozzle.

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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Patent Type & Authority Patents(China)
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