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Missing nozzle correction via multiple grids

A nozzle and grid technology, applied in printing, printing devices, etc., can solve problems such as uneven printing images

Active Publication Date: 2020-12-11
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage here is that in order to avoid overcompensation, the compensation possibilities must always be adapted to the currently corresponding printed image
In addition, the disadvantages of manipulating established grids are also considered here, which may further lead to uneven printed images

Method used

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  • Missing nozzle correction via multiple grids
  • Missing nozzle correction via multiple grids
  • Missing nozzle correction via multiple grids

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] In a preferred embodiment variant, the field of application is an inkjet printer 7 . figure 1 An example of the basic construction of a machine 7 of this type is shown in : a feeder 1 for feeding a printing substrate 2 to a receiving unit 3 in a printing mechanism 4 where the printing substrate 2 is printed by a printing head 5 print. This is a sheet inkjet printing press 7 controlled by a control computer 6 . During operation of the printing press 7 , as mentioned in the introduction above, it may occur that individual printing nozzles 8 in the printing heads 5 in the printing unit 4 fail. The result is white lines, or in the case of multicolor printing, distorted ink values.

[0029] Preferred embodiments here are: figure 2 A corresponding raster image 10 with defective printing nozzles 8 is shown. It can be seen very well how the corresponding dots are missing along the corresponding printing direction, thus resulting in the corresponding white lines. The corre...

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PUM

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Abstract

The invention relates to a method for carrying out a printing process in an inkjet printing machine (7), comprising compensating a failed printing nozzle (8) by means of a computer (6), wherein a raster image ( 10) After the rasterizing process, by increasing the ink application of adjacent printing nozzles (12) to compensate for the malfunctioning printing nozzles (8), and the method is characterized in that, by means of a computer (6) for said adjacent printing nozzles (12) ) pre-computing at least one modified raster image (13) replacing said raster image generated during rasterization in at least one row and column of adjacent print nozzles (12) (10) and the printing process takes place with this modified grid (16) in said inkjet printer (7).

Description

technical field [0001] The invention relates to a method for carrying out a printing process in an inkjet printer, the method comprising correcting a malfunctioning printing nozzle by using a pre-calculated correction grid image. [0002] The invention belongs to the technical field of digital printing. Background technique [0003] In inkjet printing, the failure of individual printing nozzles in the printheads of inkjet printers is a ubiquitous problem. Such failures of individual printing nozzles can have different causes. In addition to common faults, such as faults in the ink supply for such individual printing nozzles, a very frequent problem is clogging of the printing nozzles. Skew-printed printing nozzles are also a common problem, in which the printed dots of the individual printing nozzles deviate to one side. These printing nozzles that print skewed are also referred to as defective nozzles. The effect of a faulty printing nozzle on the printed image is the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41J2/01B41J2/135B41J2/145B41J2/165B41J29/393B41J29/38
CPCB41J2/01B41J2/135B41J2/145B41J2/165B41J29/38B41J29/393B41J2/2146B41J2/2054B41J2/2139B41J2/155
Inventor B·施特里泽尔
Owner HEIDELBERGER DRUCKMASCHINEN AG