Two-dimensional printing nozzle test charts

A technology for testing patterns and nozzles, which is applied in printing, printing devices, transfer materials, etc., and can solve problems such as the inability to obtain the quality of test pattern printing nozzles

Active Publication Date: 2020-01-14
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this invention also does not solve the problem: the characteristic values ​​obtained by printing and evaluating the nozzle test pattern only relate to the transverse direction
Therefore, the test pattern in the direction of travel cannot be obtained by means of this method to evaluate the quality of the printing nozzle

Method used

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  • Two-dimensional printing nozzle test charts
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  • Two-dimensional printing nozzle test charts

Examples

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Embodiment Construction

[0026] A preferred field of application for implementing the variant is the inkjet printer 7 . figure 1 An example of the basic structure of a machine 7 of this type is shown, comprising a feeder 1 for feeding a printing substrate 2 into a printing mechanism 4 where the printing substrate 2 is printed by a printing head 5 up to a take-up. Feeder 3. This is a sheet inkjet printer 7 controlled by a control computer 6 . As already described, it may occur that individual print nozzles in the print heads 5 in the printing unit 4 fail during operation of the printing press 7 . The consequence is white lines 9, or distorted color values ​​in the case of multicolor printing. figure 2 An example of such a white line 9 is shown in the printed image 8 .

[0027] The object of the method according to the invention is to apply a test pattern 12 for detecting characteristic values ​​of the printing nozzles, which test pattern 12 provides information both in the transverse direction and ...

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PUM

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Abstract

The invention relates to a method that detects defective printing nozzles in an inkjet printing machine (7) by a computer (6), which comprises the steps of: printing a printing nozzle test chart (12)for detection, the printing nozzle test chart (12) being detected by at least one image sensor, and analyzing the detected printing nozzle test chart (12) by means of the computer to identify the defective printing nozzles, wherein in order to create the printing nozzle test chart (12), every printing nozzle prints a surface (13, 14); the computer (6) determining a centroid of every surface (13, 14) to analyze the detected printing nozzle test chart (12) and, for all surfaces (13, 14), the computer compares an actual position of a determined centroid to a respective target position.

Description

technical field [0001] The present invention relates to a method of detecting faulty printing nozzles by using a two-dimensional printed nozzle test pattern. [0002] The technical field to which the present invention pertains is inkjet printing. Background technique [0003] In inkjet printers, it can occur that printing nozzles fail or are switched off because tolerance limits determined by specific characteristic values ​​are exceeded. Both cases can cause errors in the printed image, such as so-called white lines, ie white lines in full-tone areas. Therefore, in order to be able to classify the individual printing nozzles, the detection patterns must be embedded at specific intervals during the printing run. These detection patterns are then evaluated nozzle-dependently in order to make a decision whether to subsequently switch off or restart the printing nozzles. [0004] Different detection patterns are disclosed in the prior art. A widely used print nozzle test pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41J2/165B41J29/393
CPCB41J2/16579B41J29/393B41J2029/3935B41J2/16585B41J2/2142B41J2/2146B41J2025/008
Inventor S·内布N·R·诺瑞克A·亨J·福歇
Owner HEIDELBERGER DRUCKMASCHINEN AG
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