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Monitoring print heads in random manner

A printing head, a printing head technology, applied in printing and other directions, can solve the problems of limited printing nozzle detection and compensation process

Active Publication Date: 2020-01-21
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this application document is completely limited to the probability-based threshold calculation process of a single printing nozzle, and then to the detection and compensation process of these printing nozzles

Method used

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  • Monitoring print heads in random manner
  • Monitoring print heads in random manner
  • Monitoring print heads in random manner

Examples

Experimental program
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Embodiment Construction

[0031] The field of application of this preferred embodiment variant is inkjet printers 7 . figure 1 An example of the basic structure of such a machine 7 comprising a feeder 1 for feeding a printing substrate 2 into a printing mechanism 4 where it is printed by a printing head 5 and even a receiver is shown in Feeder 3. This is a sheet inkjet printing press 7 controlled by a control computer 6 . As already described, it may occur during operation of the printing press 7 that individual printing nozzles in the printing heads 5 of the printing unit 4 fail. The consequence is then "white lines" 9, or in the case of multicolor printing, distorted color values. figure 2 An example of such a "white line" 9 in a printed image 8 is shown in .

[0032] The method according to the invention is based on the optimal determination of the threshold values ​​in a weighted manner as disclosed in the prior art, which are determined by means of a statistical prediction model based on past ...

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PUM

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Abstract

A method for detecting and compensating for defective print heads (5) in an inkjet printing machine (7) uses a computer (6) to analyze printing nozzle test charts and / or area coverage elements to obtain characteristic values of individual printing nozzles in a print head (5), to calculate the failure probabilities (12) of these printing nozzles on the basis of thresholds, and to compensate for a printing nozzle that exceeds a specified failure probability (12). The computer (6) uses the individual failure probabilities (16) of the individual printing nozzles in a print head (5) to calculate the failure probability of the print head and initiates compensation measures as a function of the calculation. The thresholds correspond to a multi-dimensional characteristic value threshold (16) basedon which the computer (6) calculates the failure probability (12) of a printing nozzle by using an algorithm including kernel density estimation (11) through a multidimensional distribution function.

Description

technical field [0001] The invention relates to a method for detecting and compensating for defective print heads in inkjet printers by means of monitoring the print heads in a stochastic manner. [0002] The technical field to which the present invention pertains is digital printing. Background technique [0003] In inkjet printers, failure to identify defective printing nozzles (with issues such as malfunctioning, insufficient function, or skewed jetting) can lead to rejects and thus unmarketable prints. The aim is thus to avoid these problems as much as possible and to ensure that no or at least a minimum of defectives are produced. Here, the quality of each individual printing nozzle is described by means of specific characteristic values, such as intensity, inclination, grayscale values, which are obtained by suitable image processing of photographs of suitable test print patterns . These characteristic values ​​are normally ascertained at predetermined intervals dur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41J2/135
CPCB41J2/135B41J2/16526B41J2/16579B41J2/2139B41J2/2142B41J2/2146B41J2/0451B41J2/04536B41J2/04558B41J2/04586B41J2/165
Inventor S·内布N·R·诺瑞克A·亨J·福歇A·菲尔纳
Owner HEIDELBERGER DRUCKMASCHINEN AG
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