Method for detecting printing nozzle errors in inkjet printing machine

一种喷墨印刷机、喷嘴的技术，应用在印刷、打印装置、转印材料等方向，能够解决增多废页、印刷机差负荷等问题，达到高鲁棒性的效果

Active Publication Date: 2017-12-05
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the use of the samples is usually carried out independently of the actual printing job, which leads to increased waste pages and to a worse load on the printing press

Method used

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  • Method for detecting printing nozzle errors in inkjet printing machine
  • Method for detecting printing nozzle errors in inkjet printing machine
  • Method for detecting printing nozzle errors in inkjet printing machine

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0065] In a preferred embodiment variant, the field of application is a digital printer 10 which is configured as an inkjet sheet printer 10. in figure 1 An example of the structure of such a machine 10 is shown in. The corresponding sheet 11 is transported from the feeder 1 in the transport direction T through the printing device 2 to the receiver 3. The transport of the corresponding sheets 11 here takes place in particular by means of cylinders, namely the transport cylinder 5 and the printing cylinder 7. An inkjet print head 4 is arranged above the printing cylinder 7, which prints the sheets 11 that move through the printing cylinder 7 at small intervals. The printing cylinder 7 is therefore also referred to as an inkjet cylinder. In the embodiment shown, the printing cylinder 7 has three sheet holding areas 8 which are each separated from one another by a channel 9.

[0066] During the operation of the printing press 10, as described above, each printing nozzle in the pr...

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PUM

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Abstract

A method for detecting printing nozzle errors in an inkjet printing machine provides a high degree of robustness in the detection of errors by printing a nozzle test pattern (14) in the inkjet printing machine (10). The test pattern (14) is then digitalized by using a camera and transmitted to a computer (30) for evaluation. There, the recorded test pattern (14) is investigated by using methods of digital image processing, such as a Fourier analysis, and evaluated in the frequency range with regard to specific anticipated printing nozzle errors. Specific printing nozzle errors can be detected especially on the basis of amplitude, phase and variance errors in the signal in the frequency range. Moreover, by using the phase error (22), it is possible to evaluate whether the two print heads (4) are disposed in an incorrect adjustment position relative to one another by calculating displacements of the phase error in transition regions (25) of two print heads (4).

Description

Technical field [0001] The present invention relates to a method for identifying the failure of a printing nozzle in an inkjet printer. [0002] The present invention is in the field of digital printing technology. Background technique [0003] Generally, an inkjet printer includes one or more print heads, and each print head includes multiple printing nozzles. Inkjet printers use nozzles for printing by jetting ink. When each printing nozzle fails, the following area is generated, and the area cannot pass through the failed nozzle to form a pattern according to CMYK in monochrome selection. Therefore, a colorless part is formed, and the colorless part can be displayed as a white line. If it involves color printing, the corresponding color is missing in this part and the color value becomes distorted. It should also be noted that the ejection direction of a single nozzle cannot extend ideally but deviates more or less from it. In addition, the size of the inkjet dot should be c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41J2/165B41J29/38B41J29/393B41J2/14
CPCB41J2/14B41J2/16579B41J29/38B41J29/393B41J2/2142B41J2/2146B41J2025/008B41J2/0451B41J2/04586B41J2/2103
Inventor F·穆特J·克里格W·盖斯勒
Owner HEIDELBERGER DRUCKMASCHINEN AG
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