EP3216611B1 - Méthode de compensation d'orifices défaillants d'une imprimante à jet d'encre - Google Patents

Méthode de compensation d'orifices défaillants d'une imprimante à jet d'encre Download PDF

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Publication number
EP3216611B1
EP3216611B1 EP17155103.9A EP17155103A EP3216611B1 EP 3216611 B1 EP3216611 B1 EP 3216611B1 EP 17155103 A EP17155103 A EP 17155103A EP 3216611 B1 EP3216611 B1 EP 3216611B1
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EP
European Patent Office
Prior art keywords
nozzles
printing
pressure
print
printing nozzles
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17155103.9A
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German (de)
English (en)
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EP3216611A1 (fr
Inventor
Axel Hauck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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Publication of EP3216611A1 publication Critical patent/EP3216611A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16579—Detection means therefor, e.g. for nozzle clogging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • B41J2/2146—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding for line print heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2121—Ink jet for multi-colour printing characterised by dot size, e.g. combinations of printed dots of different diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • B41J2/2139—Compensation for malfunctioning nozzles creating dot place or dot size errors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J2025/008—Actions or mechanisms not otherwise provided for comprising a plurality of print heads placed around a drum

Definitions

  • the invention lies in the technical field of digital printing.
  • inkjet printing machines include one or more printheads and each printhead includes a plurality of printing nozzles.
  • the inkjet printing machines use the nozzles for printing by emitting ink.
  • These printing machines have nozzle plates with specific arrangements of the individual nozzles.
  • nozzle plates with specific arrangements of the individual nozzles.
  • the beam path of a single nozzle is not ideal but may deviate more or less, and the size of a jetted point must also be taken into account.
  • a malfunctioning nozzle affects the print quality of each printed document.
  • the reasons for the failure of individual nozzles are diverse, it may be a temporary failure or a permanent failure.
  • the most important known approach, with which the present invention is concerned, is to cover the error by adjacent printing nozzles in the same color and the same inkjet unit. That is, to compensate for individual failed inkjet printing nozzles after determining which individual nozzle, the adjacent nozzles are driven so that the dot sizes of these nozzles are increased so that the location of the failed nozzle is covered with. The neighboring nozzles thus write the picture of the failed nozzle. White lines, which result from the non-printing of individual nozzles, can thus be prevented.
  • the patent application US 020060125850 A1 describes a method and a printing press which operate on this principle. However, the process has an impact on the printed image - in particular, it becomes problematic if several directly adjacent nozzles fail. The compensation over the double or multiple distance is only possible with difficulty.
  • a pressure point is the color wheel generated by the ink droplet.
  • the positions of the pressure points of the printing nozzles, measured at their circle center point, are in reality not always the same distance from the pressure points of adjacent printing nozzles. They are more or less distracted, due to production or by partial blockage, transversely or longitudinally to the printing direction. This leads to the approach of compensation failed nozzles by increased ink drop volume of the adjacent pressure nozzles to the fact that if the pressure point of one or both pressure points of the adjacent pressure nozzles is shifted away from the failed pressure nozzle, despite compensation, albeit less, white line is formed.
  • US patent application US 2004 0104951 A1 discloses an inkjet printing machine which prevents image artifacts such as white lines by examining the real pressure points of the printing nozzles and then correcting them by changing ink drop volumes. However, this application does not disclose the compensation of completely failed pressure nozzles, but only the correction of pressure nozzles with different pressure point.
  • the object of the present invention is therefore to disclose a method for compensating failed nozzles in an inkjet printing machine, which overcomes the problems known from the prior art and has a better performance.
  • the solution to this problem is solved by a method for compensating failed nozzles in an inkjet printing machine, wherein failed nozzles are compensated by an increased ink droplet volume of adjacent nozzles and which is characterized in that the real positions of the pressure points of all the nozzles are determined and for each pressure nozzle , To compensate for their failure, the necessary ink droplet volumes of the respective adjacent pressure nozzles depending on the real position of the pressure point of the pressure nozzle and the real positions of the pressure points of the respective adjacent pressure nozzles are calculated.
  • the core of the invention is the determination of the real pressure points of all pressure nozzles before it comes to compensate for possible failed pressure nozzles.
  • a further development of the method according to the invention is that a larger distance of the pressure points leads to a larger ink droplet volume of respectively adjacent pressure nozzles and a smaller distance of the pressure points to a smaller ink droplet volume of the respectively adjacent pressure nozzles, whereby the compensation of failed pressure nozzles takes place in each case with the minimum required ink droplet volume.
  • a further development of the method according to the invention is that a nozzle pattern is printed for all printing units of the inkjet printing machine, and this printed nozzle pattern is evaluated to determine the real positions of the printing dots.
  • the pressure of a nozzle pattern is most likely to be used, which is then evaluated. With the real positions of all pressure points of all pressure nozzles then all necessary parameters, which are required for a distance-dependent compensation, can be determined.
  • An embodiment of the method according to the invention is that the deviation of the real positions of the pressure points from their desired position is calculated with the determined, real positions of the pressure points, including the statistical distribution of the deviation, and from this the necessary ink droplet volumes of the respectively adjacent pressure nozzles are determined ,
  • the optimum ink droplet volumes of the adjacent printing nozzles necessary for the compensation of the respective printing nozzle can be determined for each printing nozzle.
  • a further preferred development of the method according to the invention is that the nozzle pattern for determining the real positions of the printing dots is printed several times, with a corresponding multiple evaluation of the real positions of the printing dots to determine the stability and reproducibility of the determined real positions of the pressure points and this stability and reproducibility as a parameter in the calculation of the necessary ink droplet volumes of the respective adjacent pressure nozzles to flow.
  • a further preferred development of the method according to the invention consists in the fact that the real positions of the pressure points are re-determined at regular intervals after a certain number of print jobs have been performed.
  • the real positions of the pressure points can change in the course of the continuous operation, for example by partially clogged pressure nozzles, which then jet correspondingly obliquely, it is appropriate to repeat the determination of the positions of the pressure points at regular intervals.
  • the frequency of repetition depends on the particular press and its print quality. In this case, the experience of the user is crucial. However, it is conceivable to perform repetitions after a fixed number of printing operations or to use an automated control which in certain situations, e.g. falls below certain print quality, performs a repetition.
  • a further preferred development of the method according to the invention is that the determination of the real positions of the pressure points is realized by a two-dimensional pressure point determination in and across the direction of printing.
  • a further preferred development of the method according to the invention is that the method is used only for the printing of solid areas in the printed image.
  • a further preferred development of the method according to the invention is that only detected, failed pressure nozzles are compensated by the method according to the invention.
  • a further preferred development of the method according to the invention consists in that all pressure nozzles are compensated independently of their state according to the method according to the invention.
  • the second type of use of compensation failed nozzles by adjacent pressure nozzles is basically always to operate the pressure nozzles in compensation mode, since in practice anyway many pressure nozzles have failed and thus the complex control of individual pressure nozzles, which compensate each failed adjacent pressure nozzles, spared.
  • all pressure nozzles are thus operated in compensation mode, which leads to performance losses and slightly increased ink consumption, but makes both the control of individual pressure nozzles no longer necessary, as well as the complex detection of failed pressure nozzles superfluous.
  • all pressure nozzles are therefore operated independently of their state with the method according to the invention.
  • ink drop volume can not be set freely, but only in quantized steps over the pulse number of a waveform.
  • This activation variant for the ink droplet volumes of the corresponding printing nozzles means that in practice often only certain ink droplet volumes are available in correspondingly quantized steps for the method according to the invention. Since the control for the ink drop volumes does not allow arbitrarily small resolutions, but anyway has a lower limit for the minimum realizable ink drop volume, some form of quantization must be done. In this development, this happens via the pulse number of a waveform.
  • the field of application of the preferred embodiment is an inkjet printing machine 10.
  • An example of the structure of such a machine 10 is shown in FIG. 1 shown.
  • individual print nozzles may fail in the print heads 4 in the printing unit 2.
  • the result is then white lines 13, or in the case of multi-color printing, distorted color values.
  • An example of such a white line 13 in a printed image 12 is shown in FIG FIG. 2 shown.
  • the printing process is monitored by a control computer 20.
  • the sheet 11 is transported from the feeder 1 in the transport direction T via the transfer cylinder 5 to the printing cylinder 7 and to the printheads 4, wherein the printheads 4 consist of one or more rows of printing nozzles.
  • the cylinders 5, 7 are accelerated by one or more drives 6.
  • the sheet 11 is further transported, dried and transported via the transfer cylinder 5 to the boom 3 on.
  • FIG. 3 In the upper figure, an example of ideally positioned pressure points 15, 16, 17 of the pressure nozzles is shown. In the middle is the failed pressure nozzle, which for compensation, the two adjacent pressure nozzles 16, 17 use a correspondingly enlarged ink droplet volume 19 to compensate for the failed pressure nozzle and to fill the thereby occurred white line 13.
  • the lower part of FIG. 3 is the same representation again for real positions of pressure points 16 ', 17', 18 indicated for the pressure nozzles. As can be seen, some of the pressure points 18 are shifted transversely to the respective printing direction, resulting in different overlaps between the pressure areas respectively adjacent pressure nozzles leads.
  • the illustration is schematic and for better visibility the deviations of the pressure points from their target positions are exaggerated.
  • both adjacent pressure nozzles are shifted to the failed pressure nozzle with respect to their pressure points 16 ', 17' away from the failed pressure nozzle.
  • the pressure point of the right adjacent pressure nozzle 16 ' is further away from the failed pressure nozzle shifted than that of the left adjacent pressure nozzle 17'.
  • the inventive method and as in FIG. 3 Thus, to compensate, the right adjacent pressure nozzle needs to use a larger ink drop volume 19 to compensate for the gap caused by the failed pressure nozzle than the left adjacent pressure nozzle. This is the core of the process according to the invention.
  • the first method step is to determine the real dot positions of the pressure points 18 for the printing nozzles via a nozzle test pattern which has to be printed for all print heads 4.
  • the printed nozzle patterns are examined and from this the deviation from the theoretically present, ideal positions of the pressure points 15 is determined.
  • the nozzle test patterns are printed several times and measured several times. From this, in addition to the actual real positions of the pressure points 18, the statistical distribution of the deviation of the real pressure points 18 from the theoretical pressure points 15 can be determined. With these parameters can then be calculated by the computer 20 for each pressure nozzle, how large the ink drop volume 19 of this pressure nozzle must be in order to compensate for each of the left adjacent or the right adjacent pressure nozzle in case of failure.
  • D Comp D 0 + 4 * standard deviation the pressure points calculated for the full area.
  • the necessary compensation drop volume 19 differs in the case of a maximum distance almost twice the necessary compensation drop volume 19 at a minimum pressure point distance. It can be easily imagined what would happen if the standard compensating drop volume 19 of 8.77 picolitres were compensated for if the adjacent failed pressure nozzle had only a minimal separation with respect to its pressure point. You would have an overcompensation, which would be realized in a misprint of a black line. In order to avoid this overcompensation, therefore, the individual compensation drop volume 19 for each pressure nozzle is calculated and stored for the left and / or right adjacent pressure nozzle. With these modified compensation drop volumes 19, the actual printing of the print job in the inkjet machine 10 is then carried out.
  • the printing machine 10 can be operated in the continuous compensation mode, in the event that no detection of failed printing nozzles is performed. In this case, all of the print nozzles would print at the average between the left adjacent nozzle compensation drop volume 19 and the right adjacent nozzle compensation drop volume 19. Of course, in the case of the pressure nozzles at the very outside, only one value would be used to compensate for the failure of the adjacent pressure nozzle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Ink Jet (AREA)

Claims (8)

  1. Procédé de compensation de buses d'impression défaillantes dans une machine à imprimer à jet d'encre, pour lequel les buses d'impression défaillantes sont compensées par un volume de gouttes d'encre accru de buses d'impression voisines, composé des étapes suivantes :
    • Impression d'un motif de buse pour toutes les unités d'impression de la machine à imprimer à jet d'encre, caractérisée par :
    • Évaluation du motif de buse imprimé pour la détermination de la position réelle des points d'impression de toutes les buses d'impression
    • Calcul de l'écart des positions réelles des points d'impression par rapport à leur position de consigne avec les positions réelles déterminées des points d'impression, incluant la répartition statistique de l'écart
    • Calcul des volumes de gouttes d'encre nécessaires des buses d'impression voisines en fonction de la position réelle du point d'impression de la buse d'impression par rapport aux positions réelles des points d'impression des buses d'impression respectivement voisines pour la compensation des buses d'impression défaillantes, pour lequel un écart plus important des points d'impression des buses d'impression voisines se traduit par un volume de gouttes d'encre plus important des buses d'impression voisines et un écart plus faible des points d'impression des buses d'impression voisines par un volume de gouttes d'encre plus faible des buses d'impression voisines et la compensation de buses d'impression défaillantes a respectivement lieu avec le volume de gouttes d'encre minimal requis.
  2. Procédé selon la revendication 1,
    caractérisé par le fait
    que le motif de buse pour la détermination de la position réelle des points d'impression est imprimé plusieurs fois, avec évaluation répétée correspondante des positions réelles des points d'impression, pour déterminer la stabilité et la reproductibilité des positions réellement déterminées des points d'impression et exploiter cette stabilité et reproductibilité comme paramètres dans le calcul des volumes de gouttes d'encre nécessaires des buses d'impression voisines respectives.
  3. Procédé selon l'une des revendications précédentes,
    caractérisé par le fait
    que les positions réelles des points d'impression sont déterminées à nouveau à intervalles réguliers, après exécution d'un nombre défini de travaux d'impression.
  4. Procédé selon l'une des revendications précédentes,
    caractérisé par le fait
    que la détermination des positions réelles des points d'impression est réalisée par une détermination bidimensionnelle des points d'impression dans le sens d'impression et perpendiculairement à celui-ci.
  5. Procédé selon l'une des revendications précédentes,
    caractérisé par le fait
    que le procédé est uniquement utilisé pour l'impression d'aplats dans l'image.
  6. Procédé selon l'une des revendications précédentes,
    caractérisé par le fait
    que seules des buses d'impression défaillantes détectées sont compensées via le procédé objet de l'invention.
  7. Procédé selon l'une des revendications 1 à 5,
    caractérisé par le fait
    que toutes les buses d'impression sont compensées via le procédé objet de l'invention, indépendamment de leur état.
  8. Procédé selon l'une des revendications précédentes,
    caractérisé par le fait
    que le volume de gouttes d'encre ne peut pas être réglé librement, mais uniquement par étapes quantifiées via le nombre de pulsations d'une forme d'onde.
EP17155103.9A 2016-03-10 2017-02-08 Méthode de compensation d'orifices défaillants d'une imprimante à jet d'encre Active EP3216611B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016203917.2A DE102016203917A1 (de) 2016-03-10 2016-03-10 Verfahren zur Kompensation ausgefallener Druckdüsen in einer Inkjet-Druckmaschine

Publications (2)

Publication Number Publication Date
EP3216611A1 EP3216611A1 (fr) 2017-09-13
EP3216611B1 true EP3216611B1 (fr) 2019-04-10

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EP (1) EP3216611B1 (fr)
CN (1) CN107175916B (fr)
DE (1) DE102016203917A1 (fr)

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DE102018220524A1 (de) * 2018-01-25 2019-07-25 Heidelberger Druckmaschinen Ag Verfahren zur Detektion ausgefallener Druckdüsen in einer Inkjet-Druckmaschine
CN110171203B (zh) * 2018-02-19 2020-12-22 海德堡印刷机械股份公司 用于补偿在喷墨印刷机中的故障印刷喷嘴的方法
EP3530471A1 (fr) * 2018-02-27 2019-08-28 OCE Holding B.V. Procédé et appareil de compensation d'écart de position de tir d'élément d'impression
CN110202936B (zh) * 2018-02-28 2020-12-08 森大（深圳）技术有限公司 基于状态图检测喷嘴是否异常的方法、装置、设备及介质
CN108511634B (zh) * 2018-03-05 2020-01-14 深圳市华星光电半导体显示技术有限公司 喷墨打印机及其打印方法
CN110091593B (zh) * 2018-04-28 2020-07-10 广东聚华印刷显示技术有限公司 喷墨打印方法、装置、系统、计算机设备和存储介质
CN110682684B (zh) * 2018-07-06 2021-04-20 海德堡印刷机械股份公司 二维印刷喷嘴测试图案
DE102019211274A1 (de) * 2018-08-30 2020-03-05 Heidelberger Druckmaschinen Ag Druckdüsenkompensation unter Berücksichtigung benachbarte Flächendeckungen
DE102019211687A1 (de) * 2018-09-11 2020-03-12 Heidelberger Druckmaschinen Ag Metainformationscodierung für Inkjet-Druckprozesse
DE102019127870A1 (de) * 2018-11-19 2020-05-20 Heidelberger Druckmaschinen Ag Koaleszenzvermeidung
EP3882036B1 (fr) * 2020-03-20 2024-06-26 Heidelberger Druckmaschinen AG Coalescence des buses de compensation

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Publication number Publication date
EP3216611A1 (fr) 2017-09-13
CN107175916B (zh) 2020-04-21
CN107175916A (zh) 2017-09-19
DE102016203917A1 (de) 2017-09-14

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