Method for compensating failed printing nozzles in inkjet printing system

A technology of inkjet printers and nozzles, applied in printing, printing devices, etc., can solve problems such as hardware redundancy and low efficiency, and achieve the effects of avoiding overcompensation, improving image quality, and eliminating redundant structures

Active Publication Date: 2016-05-25
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] It is therefore the object of the present invention to disclose a method for compensating for deactivated printing nozzles in an inkjet printer which overcomes the disadvantages of the known methods with regard to hardware redundancy and inefficiency

Method used

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  • Method for compensating failed printing nozzles in inkjet printing system
  • Method for compensating failed printing nozzles in inkjet printing system
  • Method for compensating failed printing nozzles in inkjet printing system

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Embodiment Construction

[0047] In a preferred embodiment variant, this field of application is the inkjet printing machine 1 . exist figure 1 An example of a structure for such a machine 1 is shown in . During operation of the printing press 1 , as already explained at the outset, individual printing nozzles in the printing head 7 in the printing unit 6 can become deactivated. The result is then a white line 13, or, in the case of multicolor printing, distorted color values. An example of such a white line 13 is in figure 2 shown in .

[0048] Since the described method is inefficient to be carried out manually by a user, this execution is carried out automatically by the control computer 14 of the inkjet printer 1 . image 3 An exemplary structure of such a system is shown. This automated method is integrated into the workflow of the printing press 1 here. The configuration of the control computer 15 with respect to the individual method steps can be corrected manually by the user if necessar...

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PUM

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Abstract

A method for compensating failed printing nozzles in inkjet printing machines using a control computer, includes printing a test form for a material combination, evaluating the print and creating a look-up table having compensation probabilities for local surface density, detecting a failed nozzle, reading the size of the intended droplet to be compensated at the failed nozzle, calculating local surface density at the failed nozzle, reading a compensation probability from the table with the calculated local surface density, calculating a pseudo-random number for adjacent pixels right and left of the pixel to be compensated, increasing the droplet size for adjacent pixels if the pseudo-random number therefor is lower than the compensation probability from the table, calculating adjacent droplet sizes for all intended droplets at the failed nozzle and using the changed droplet sizes in printing data. The print job is carried out with changed printing data.

Description

technical field [0001] The invention relates to a method for compensating for deactivated printing nozzles in an inkjet system. [0002] The invention is in the technical field of digital printing. Background technique [0003] Inkjet printers typically include one or more print heads, and each print head includes one or more print nozzles. Inkjet printers use nozzles to print by firing ink. Such inkjet printers have a nozzle plate with a special arrangement of the individual nozzles which allows a resolution of up to 1200 dpi. This requires a nozzle pitch of approximately 20 μm. When individual printing nozzles are deactivated, regions are produced which cannot be drawn by the nozzles provided for this purpose in terms of single color separations (according to BCMY). This results in a colorless location, which may appear as a white line. If multicolor printing is involved, the corresponding color is missing at this point and the color values ​​are distorted. It should...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41J2/165
CPCB41J2/2146B41J2/2142B41J2/2139B41J29/393B41J2/01B41J2/0451B41J2/16579
Inventor H·克勒R·蒂塔
Owner HEIDELBERGER DRUCKMASCHINEN AG
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