EP3085536A1 - Procede de detection de buses d'impression defectueuses dans des systemes d'impression a jet d'encre - Google Patents

Procede de detection de buses d'impression defectueuses dans des systemes d'impression a jet d'encre Download PDF

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Publication number
EP3085536A1
EP3085536A1 EP16161337.7A EP16161337A EP3085536A1 EP 3085536 A1 EP3085536 A1 EP 3085536A1 EP 16161337 A EP16161337 A EP 16161337A EP 3085536 A1 EP3085536 A1 EP 3085536A1
Authority
EP
European Patent Office
Prior art keywords
image
printing
print image
print
control computer
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.)
Withdrawn
Application number
EP16161337.7A
Other languages
German (de)
English (en)
Inventor
Christoph Michel
Hans Köhler
Ralf Tita
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP3085536A1 publication Critical patent/EP3085536A1/fr
Withdrawn legal-status Critical Current

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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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/0451—Control methods or devices therefor, e.g. driver circuits, control circuits for detecting failure, e.g. clogging, malfunctioning actuator
    • 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
    • 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
    • B41J2/2142—Detection of malfunctioning nozzles
    • 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04586—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads of a type not covered by groups B41J2/04575 - B41J2/04585, or of an undefined type
    • 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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
    • 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

Definitions

  • the present invention relates to a method for detecting failed nozzles in inkjet printing systems having the features of claim 1 and a device for implementing such a method having the features of the preamble of claim 9.
  • 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, which allow a resolution of up to 1200 dpi. This requires nozzle spacings of approx. 20 ⁇ m.
  • Failure of a single pressure nozzle creates areas that can not be imaged by the designated nozzle in the single color separation, according to BCMY. This results in color-free areas, which can show up as white lines. If it is a multicolor print, the corresponding color is missing at this point and the color values are distorted.
  • 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.
  • One approach attempts to cover the error with other nozzles in the same color and inkjet unit. That is, it will be to compensate for individual failed inkjet printing nozzles after determining which individual nozzle, the adjacent nozzles are controlled 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.
  • Another known approach is to replace the failed pressure nozzle through the nozzles of the other used inks in the same place.
  • An attempt is made, by targeted and controlled overprinting of the remaining available colors, to come as close as possible to the failed printing ink.
  • This eliminates the need for redundant nozzles or heads, nor does the failure of adjacent nozzles cause problems.
  • the main drawback of this compensation method is that it can only be used for multicolor printing.
  • an increased computing and taxation needs by the computer of the printing press required to determine the necessary color combinations.
  • the resulting print result may deviate significantly from the desired values.
  • the prerequisite for such compensation is the correct detection of a failed pressure nozzle. That is, not only does it need to be recognized that such a failure has occurred, but it also has to be recognized which pressure nozzle is exactly as most known compensation methods require the exact knowledge of the non-functioning pressure nozzles.
  • Test print images are printed.
  • Option A The test form is printed as a separate job on the press.
  • Option B The test form is between the benefits of printing from the roll or unused paper edge when printing sheets.
  • This test form allows a relatively simple automated detection of failed inkjet nozzles.
  • Disadvantage is that a paper edge or gap between the benefits not desired in each type of printing, or can be implemented. It creates a lot of waste when the test pattern is created as a separate print job.
  • a narrow paper edge allows only limited test shapes - so only the inspection of a part of the nozzles, so that an immediate detection and compensation of failed nozzles is not guaranteed. That is, there is production of rejects or, alternatively, inadequate use of full paper size.
  • the object of the present invention is therefore to disclose a method and a device for detecting failed nozzles in inkjet printing machines, which overcomes the disadvantages of the known methods with respect to the need for a test pattern or a lack of performance.
  • the inventive solution to this problem is a method having the features of main claim 1.
  • the basis of the method according to the invention is the detection of failed printing nozzles by a displacement of the printed image.
  • the first printed benefit is detected by a camera and moved in the control computer by at least one pressure nozzle transversely to the printing direction. Whether the shift to the left or to the right happens is irrelevant. The only condition is that in the direction of displacement enough to date unused printing nozzles are present, so that continue and despite the shift of the entire benefit can be printed.
  • the next benefit is printed, digitized again and compared in the control computer with the old, non-shifted image. Unusual pressure nozzles can be determined by the fact that in the printing direction vertical free surfaces in the second use have "moved" around the shift width. If they were part of the printed image, they would have to appear again in the same image location in the shifted print image.
  • the advantage of this method is that, compared to the method known from the prior art, no special test pattern for detecting a nozzle failure is needed, since the detection is based on the actual printed image. In contrast to the known methods, which realize the detection of a nozzle failure in the printed image, no knowledge of a desired print image is required. Compared to known methods, which identify missing nozzles in the print image without knowledge of the target print image, no complex analyzes of the printed lines over many prints are necessary. It is according to the invention a real, recognizable for the image sensor by subtraction between two copies of the printed image discernible difference, which can have as cause only a faulty pressure nozzle.
  • a preferred development is that, in addition to the displacement of the first digital print image by at least one print nozzle transversely to the printing direction, a displacement of the print head by the same amount takes place in the opposite direction. Since the control computer in the method according to the invention before the comparison between the first and second digitized benefits, the calculation of the print image out again - the image sensor is indeed still in the same place - it makes sense, the purely digital shift of the printed image by an equal mechanical Offset the print head in the opposite direction again. As a result, the benefit for the image sensor is back to the old location, while the shift of the printed image is still maintained on adjacent printing nozzles. The work of the control computer for the detection is thus facilitated. Alternatively, the image sensor can also be moved by the same amount and the same direction of the digital shift of the printed image.
  • a further preferred development is that the comparison between the first and second recorded digital print image is done by subtraction.
  • the simplest and most efficient way of comparing the two recorded benefits is achieved by subtraction. Only at points of a defective pressure nozzle may a relevant color value be present after the difference.
  • the detection result is output by the control computer via a display to a user.
  • detection and compensation preferably take place automatically within the scope of a workflow process for the printing process
  • an optional feedback of the detection result to the human user via a graphical display is a necessary component of the method according to the invention.
  • the detection result is used as a trigger for the start of a compensation mode of the inkjet printing press for the at least one failed printing nozzle.
  • the detection result is used in the context of the workflow process as a trigger for the activation of a compensation mode.
  • the image sensor detects only one image section of the respective print image.
  • the detection process does not have to be performed over the entire printed benefit. It also reaches a detected strip, which detects all active pressure nozzles. Further reductions in the surveillance area are possible, but of course lead to a corresponding loss of information.
  • a further preferred development is that the captured image section is added up to a brightness profile during the current printing process and the difference between the brightness profiles of the captured image sections of the respective first and second digital print image occurs. Since the image artifacts caused by failed print nozzles naturally appear strip-shaped in the print direction, instead of a comparison over the entire recorded benefit or monitoring area, this can also be added up to a brightness profile, whereby the adjustment then takes place between the two brightness profiles. This reduces the computational effort for the control computer massively.
  • a preferred development is that the displacement of the first digital print image by at least two printing nozzles transversely to the printing direction in steps of at least one pressure nozzle happens.
  • the shift of the digital print image by the total shift can also happen in several steps. For this, of course, a total shift by the distance of at least two pressure nozzles is required.
  • this approach may be beneficial when used in print Picture elements are present which resemble the strip-like image artifacts or if larger, completely unprinted areas are present in the printing direction.
  • An implementation of the method according to the invention to achieve the object is also achieved by an inkjet printing press, wherein the printing press for implementing a method according to at least one of claims 1 to 8 is set up.
  • the invention also includes a printing machine which is set up in accordance with the previous method claims.
  • FIG. 1 An example of the structure of such a machine 1 is in FIG. 1 shown.
  • individual print nozzles may fail in the print heads 7 in the printing unit 6.
  • the result is white lines 13, or in the case of multi-color printing, distorted color values.
  • An example of such a White Line 13 is in FIG. 2 shown.
  • FIG. 3 shows the exemplary structure of a such system.
  • the automated method is integrated into the workflow of the printing machine 1.
  • the configuration of the control computer 15 with regard to individual method steps can be manually corrected by the user if necessary.
  • the control computer 15 is part of the printing press controller 14.
  • FIG. 4 The functional principle of the detection method is in FIG. 4 shown in detail in the form of a preferred embodiment.
  • Each printed image, or even the portion of an image 20 is detected by an image sensor.
  • the print image Prior to printing the next copy or portion 20 of the image, the print image is electronically shifted transversely to the print direction by one or more print nozzles so that other nozzles print the image information.
  • a mechanical adjustment simultaneously displaces the printheads by the same amount across the print direction, counter to the electronic shift, so that the next copy of the print image is printed at the same position from the perspective of the image sensor.
  • the opposite shift of the digital print image and the physical position of the head cancel each other out from the perspective of the image sensor.
  • the lines / columns of the image change their nozzle assignment by the amount of digital shift in this process.
  • a line-shaped artifact which is caused by a pressure column without pressure data, that is intended, remains in the resulting, twice counter-shifted image, in its original position.
  • a linear artifact 13 in the form of a pressure column 21, which is generated by defective nozzles, will only follow the physical displacement and thus be displaced in the resulting printed image 17.
  • a further embodiment variant of the difference formation is the integration of the image data recorded in the image sensor over a specific period of a short image section to be defined into a brightness profile.
  • an error in the print image is immediately visible:
  • the digital shift of the print image is possible even without mechanical counter-correction.
  • the print image is shifted transversely to the printing direction by one or more printing nozzles, so that other nozzles print the image information.
  • no simultaneous mechanical counter-displacement is performed.
  • the image acquisition of the camera is shifted by the necessary amount in the required direction.
  • the control computer during image evaluation i. before subtraction, move the scanned image 16 by the appropriate amount. After this operation, the differences of the successive images are just as possible again.
  • the absolute position shifts on the substrate For most print jobs, this minimum absolute displacement can be tolerated. Analysis and subtraction are not affected anyway.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Ink Jet (AREA)
EP16161337.7A 2015-04-24 2016-03-21 Procede de detection de buses d'impression defectueuses dans des systemes d'impression a jet d'encre Withdrawn EP3085536A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015207566.4A DE102015207566B3 (de) 2015-04-24 2015-04-24 Verfahren zur Detektion ausgefallener Druckdüsen in Inkjet-Drucksystemen

Publications (1)

Publication Number Publication Date
EP3085536A1 true EP3085536A1 (fr) 2016-10-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP16161337.7A Withdrawn EP3085536A1 (fr) 2015-04-24 2016-03-21 Procede de detection de buses d'impression defectueuses dans des systemes d'impression a jet d'encre

Country Status (5)

Country Link
US (1) US9539803B2 (fr)
EP (1) EP3085536A1 (fr)
JP (1) JP6092444B2 (fr)
CN (1) CN106064529A (fr)
DE (1) DE102015207566B3 (fr)

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DE102017101527A1 (de) 2017-01-26 2018-07-26 Océ Holding B.V. Verfahren zum Detektieren einer fehlerhaften Aufbringung eines im aufgebrachten Zustand unsichtbaren Beschichtungsstoffes, insbesondere eines Primers, zum Bedrucken eines Aufzeichnungsträgers und entsprechendes Drucksystem
JP7169983B2 (ja) * 2017-03-10 2022-11-11 テトラ ラバル ホールディングス アンド ファイナンス エス エイ パッケージング材料用の印刷システム
DE102017213262B4 (de) * 2017-08-01 2022-09-22 Heidelberger Druckmaschinen Ag Bilderfassung mit bereichsweiser Bildauflösung
DE102017217993B3 (de) * 2017-10-10 2018-07-26 Heidelberger Druckmaschinen Ag Schwellwertbestimmung bei der Detektion ausgefallener Druckdüsen
DE102018220524A1 (de) 2018-01-25 2019-07-25 Heidelberger Druckmaschinen Ag Verfahren zur Detektion ausgefallener Druckdüsen in einer Inkjet-Druckmaschine
DE102018201785B3 (de) 2018-02-06 2018-10-31 Heidelberger Druckmaschinen Ag Gestauchtes Druckbild
DE102018202027B3 (de) * 2018-02-09 2018-11-22 Heidelberger Druckmaschinen Ag Verfahren zur Detektion defekter 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
CN110239210B (zh) * 2018-03-09 2021-08-24 晋江千航服饰有限公司 一种带有颜色补偿的彩色印刷机
US10739675B2 (en) 2018-05-31 2020-08-11 Canon Kabushiki Kaisha Systems and methods for detection of and compensation for malfunctioning droplet dispensing nozzles
CN110667254B (zh) * 2018-07-03 2022-08-02 海德堡印刷机械股份公司 借助神经网络的喷嘴健康探测方法
DE102018132818B4 (de) 2018-12-19 2022-06-23 Koenig & Bauer Ag Verfahren zum Betreiben einer Tintenstrahldruckmaschine
CN111439035B (zh) * 2019-01-17 2022-03-18 海德堡印刷机械股份公司 改进的印刷喷嘴测试图案
EP3921172A1 (fr) * 2019-02-04 2021-12-15 Windmöller & Hölscher KG Procédé pour améliorer la qualité d'une image d'impression imprimée par jet d'encre
US11273636B2 (en) 2019-12-12 2022-03-15 Ricoh Company, Ltd. Adaptive printhead cleaning
CN115402005B (zh) * 2021-05-28 2024-03-01 广东聚华印刷显示技术有限公司 打印头的喷嘴检测方法、检测装置以及存储介质

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JP2016203636A (ja) 2016-12-08
DE102015207566B3 (de) 2016-04-14
US9539803B2 (en) 2017-01-10
US20160311218A1 (en) 2016-10-27

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