EP3756894B1 - Procédé de fonctionnement d'une machine à imprimer à jet d'encre - Google Patents

Procédé de fonctionnement d'une machine à imprimer à jet d'encre Download PDF

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Publication number
EP3756894B1
EP3756894B1 EP19182621.3A EP19182621A EP3756894B1 EP 3756894 B1 EP3756894 B1 EP 3756894B1 EP 19182621 A EP19182621 A EP 19182621A EP 3756894 B1 EP3756894 B1 EP 3756894B1
Authority
EP
European Patent Office
Prior art keywords
ink
pressure
printing
pressures
printing mode
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
EP19182621.3A
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German (de)
English (en)
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EP3756894A1 (fr
Inventor
Dr. Nicklas Norrick
Dr. Stefan Knauf
Manfred Häußler
Sven Butschko
Jörg-Achim FISCHER
Burghart Schnabel
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 date
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Priority to EP19182621.3A priority Critical patent/EP3756894B1/fr
Publication of EP3756894A1 publication Critical patent/EP3756894A1/fr
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Publication of EP3756894B1 publication Critical patent/EP3756894B1/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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • 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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/18—Ink recirculation systems

Definitions

  • the invention relates to a method having the features of the preamble of claim 1
  • the invention is in the technical field of the graphics industry and there in particular in the field of industrial, i.e. highly productive ink printing (inkjet) on flat substrates, i.e. the application of liquid ink to sheet or web-shaped printing materials, preferably made of paper, cardboard, cardboard, plastic or composite material.
  • the invention is in the sub-area of supplying inkjet print heads with liquid ink.
  • liquid ink is applied by generating a print image on a flat substrate, with an ink print head (abbreviated: head) with individually controllable nozzles producing the finest ink droplets corresponding to the image to be printed being preferred in the picoliter range, and transfers them contact-free to the printing material as pressure dots.
  • the nozzles can be controlled by means of piezo actuators.
  • the print heads have to be constantly supplied with liquid ink during printing, for which a so-called ink supply is usually used.
  • Such facilities usually include a reservoir and lines with pumps.
  • the DE 10 2016 217 879 A1 discloses a printing unit which has at least one reservoir for coating medium and an equalizing tank and at least one print head, the at least one print head having at least one Print head supply line is fluidically connected to the reservoir and wherein the printing unit has at least one supply line which extends from the reservoir to the reservoir.
  • the unit has two pressure sensors for measuring the pressure of the ink relative to the ambient pressure.
  • the U.S. 2008/0273063 A1 discloses a system and method for supplying ink to a reciprocating printhead. Sensors are used to measure the fill level of the ink. The document also discloses, for example, what is known as purging, ie the ejection of ink in order to clean the print heads and in particular their nozzles.
  • the EP2468512B1 discloses a liquid circulating device with two sensors for measuring the pressure in the ink.
  • the liquid circulating device is used to suppress the fluctuations in the pressure applied to a nozzle when the liquid starts to circulate with respect to the nozzle.
  • recognizing and possibly replacing faulty sensors are not intended as a purpose.
  • the EP3456541A1 discloses a device for ejecting liquid and a corresponding method.
  • the stated purpose is to stabilize the opening operation of a valve element at the time of generating a liquid flow in a liquid ejecting head.
  • recognizing and possibly replacing faulty sensors are not intended as a purpose.
  • the US8042895B2 discloses a method of using an ink reservoir of a printing device.
  • the intended use is to develop an ink recovery mode of operation in response to the difficulties caused by changes in ink conductivity.
  • detecting and possibly replacing malfunctioning sensors is not intended as an intended use.
  • a method for operating an ink printing machine which comprises a reservoir for ink, a plurality of print heads for ejecting ink droplets and two ink lines, namely a supply line and a return line, between the reservoir and the print heads, the pressure of the ink in at least one of the both ink lines are measured with a pressure sensor, the ink printing machine being operated at times in a printing mode and at times in a non-printing mode, and in the non-printing mode the pressure p1 in the supply line is measured with a first pressure sensor and the pressure p2 in the return line is measured with a second pressure sensor is measured, is characterized in that i) that temporarily operating the machine in the non-printing mode and measuring the pressures p1 and p2 in the non-printing mode are used to check the two pressure sensors for error-free operation, ii) that when after the measures under i) it is ensured that the two pressure sensors measure correctly, the meniscus pressure on the print heads is set or tracked correctly, and
  • the invention advantageously makes it possible to avoid replacing components which are actually working correctly, and therefore makes it possible to save time and money.
  • the invention also makes it possible to avoid the unintentional swapping occurring on the basis of erroneous assumptions, for example based on erroneous measured values.
  • the inkjet printer is operated in a non-printing mode, eg a cleaning mode or a maintenance mode, preferably at least temporarily, eg by changing from the printing to the non-printing mode.
  • a non-printing mode eg a cleaning mode or a maintenance mode
  • the pressure p1 in the flow line with a first pressure sensor and the pressure p2 in the return line is measured with a second pressure sensor.
  • the measured values p1 and p2 obtained in the non-printing mode can advantageously be used to draw conclusions or to carry out computer-aided calculations in this regard, which make it possible to avoid replacing components which actually function faultlessly unnecessarily.
  • Operating the machine in the non-printing mode and measuring the pressures in the non-printing mode can advantageously be used to check the pressure sensors for error-free operation in a simple manner. No additional and expensive components, especially test equipment, are required for this.
  • the checking can be automated and therefore profitably be done regularly. In this way, observed printing errors can be traced back to an incorrectly set ink pressure and in particular meniscus pressure (ink pressure at the nozzle opening), instead of incorrectly assuming that a print head is defective and must be replaced.
  • the knowledge obtained that at least one of the pressure sensors is not measuring correctly can prevent such erroneous conclusions and the unnecessary costs that result from them.
  • the so-called meniscus pressure on the print heads can be set or tracked without errors. If this additional measure does not lead to a better print result, the defective print heads can be replaced.
  • a preferred development of the invention can be characterized in that print heads are cleaned in the non-printing mode and ink is ejected in the process and that the pressures p1 and p2 are measured in the non-printing mode and at a measurement time, namely before the ink is ejected or directly before the ink - Eject, done.
  • a preferred development of the invention can be characterized in that the ink lines are filled with ink and that the pressures p1 and p2 are ink pressures.
  • the ink lines are filled with ink (so-called "wet" test). In the wet test, possible pumps in the ink circuit are at a standstill at least for the duration of the measurement and the value of the volume flow of ink is zero.
  • ⁇ ⁇ g ⁇ ⁇ h is a fixed, known value and can be expressed in a electronic memory can be provided for the calculation. If ⁇ p deviates from this value, at least one of the two sensors is not working correctly. Maintenance work can therefore be limited to the sensors and, in particular, the expensive print heads do not need to be maintained or even replaced.
  • a preferred development of the invention can be characterized in that ink is refilled or changed in the non-printing mode and the ink lines are pumped empty and that the pressures p1 and p2 are measured in the non-printing mode and at a measuring time, namely after the empty pumping or directly after pumping empty.
  • a preferred development of the invention can be characterized in that the ink lines are not filled with ink and that the pressures p1 and p2 are atmospheric pressures.
  • the ink lines are not filled with ink but with air (so-called "dry" test).
  • a preferred development of the invention can be characterized in that a computer is provided which carries out the arithmetic determination and that the computer automatically starts measuring the pressures p1 and p2 at the time of measurement.
  • a preferred development of the invention can be characterized in that the computer stores the values of the pressures p1 and p2 at several measurement times, calculates a trend of the measured value and issues a warning if the trend exceeds a predetermined value.
  • a preferred development of the invention can be characterized in that the pressure p1 is measured in a flow distributor of the flow line and that the pressure p2 is measured in a return distributor of the return line.
  • figure 1 shows a preferred embodiment of a device with which the method according to the invention can be carried out.
  • An ink printing machine 1 for printing sheets or webs of printing material is shown, in particular a machine for the industrial production of printed products, for example commercial items or packaging.
  • the machine 1 comprises an ink supply device 2; briefly an ink supply 2.
  • This in turn comprises a reservoir 3 for the ink and ink lines 4, ie a feed line 4a with a feed pump 5a and a return line 4b with a return pump 5b.
  • the line 4a leads to a flow distributor 6a, from where the ink reaches the print heads 8. From there, unprinted (circulating or agitated) ink reaches a return distributor 6b and finally back to the reservoir 3.
  • a so-called bypass 7 can optionally be provided between the supply distributor and the return distributor.
  • the flow manifold can be part of the flow line and the return manifold can be part of the return line.
  • the print heads 8 eject ink drops in accordance with the control corresponding to the print image and in this way generate the print image on the printing material.
  • non-printing mode hereinafter M2
  • the print heads eject ink droplets 31, e.g.
  • a first pressure sensor 20 can be used to measure the pressure p1 of the ink (or the air pressure in the supply line 4a and/or in the supply distributor 6a when the pump is empty); accordingly, with a second pressure sensor 21, the pressure p2 in the return line 4b and/or in the return distributor 6b. Measurement signals or measurement data obtained in this way can be transmitted to a computer 22 of the machine 1 or the device 2 via lines 23a. Signals and/or data processed by the computer, e.g.
  • the device 2 shown thus circulates ink 30 to the printheads 8 and the printheads thus produce ink drops 31 for printing.
  • figure 2 shows a preferred embodiment of the method according to the invention with the method steps 40 to 49. Such a method can be carried out with a device as in figure 1 shown to be carried out.
  • process step 40 the required components are provided, e.g. the reservoir 3, the print heads 8, the ink lines 4, the pressure sensors 20 and 21 and the computer 22.
  • the printing machine 1 is in the printing mode M1, i.e. the machine is productive and printed products are produced by transferring ink drops 31 onto a printing material.
  • the printing machine 1 is in the non-printing mode M2, i.e. the machine is not productive; for example, a printhead cleaning, an ink change or maintenance is carried out.
  • the machine can be transitioned from M1 mode to M2 mode, either automatically or with operator intervention.
  • step 43 at least part of the supply device 2 is pumped dry, e.g. the ink lines 4 and/or the distributors 6a and 6b. This can be done, for example, to prepare for an ink change.
  • This step, along with the subsequent step of measuring, is called “dry” testing since the measurements are made in ink-free lines.
  • a pressure measurement takes place: the first pressure sensor 20 measures the pressure p1 of the ink or (in the optional pumped-empty state) of the air in the vicinity of the flow distributor 6a; the second pressure sensor 21 accordingly measures the pressure p2 or the air in the vicinity of the return manifold 6b.
  • the pressure sensors can be attached to or in the distributors.
  • step 45 the print heads 8 are cleaned and ink droplets 31 are ejected (but not for printing!), preferably into the purge tank 9.
  • This step along with the previous step of measuring, is called “wet” testing since the measurements are made in ink-filled ducts.
  • the measurement 44 preferably takes place either at a measurement time t before the cleaning or ink ejection according to step 45 and particularly preferably directly before the cleaning 45 or ink ejection. In this case, a continuous agitation or circulation of the ink is preferably interrupted.
  • the pressures of the liquid ink are measured with p1 and p2 ("wet").
  • the measurement 44 preferably takes place at a measurement time t after the optional pumping empty 43, particularly preferably directly after the pumping empty.
  • the air pressures of the ambient air are measured with p1 and p2 ("dry").
  • ⁇ is the density of the ink
  • g is the acceleration due to gravity
  • h1 and h2 are again the heights (positions in the vertical) of the measuring sensors 20 and 21 (or the measuring locations, i.e. the manifolds 6a and 6b if the sensors are attached to the manifolds).
  • the difference between the air pressures at height h1 and height h2 i.e. the positions of the measuring sensors in the vertical) can be neglected.
  • the measurement in both variants can be started automatically by the computer 22 or alternatively "manually", i.e. by intervention by a machine operator.
  • the computer 22 can store the pressures p1 and p2 measured at several measurement times t and calculate a trend over time therefrom and, according to method step 48, output an optical or acoustic warning if this calculated trend exceeds (or falls below) a predetermined limit value.

Landscapes

  • Ink Jet (AREA)

Claims (10)

  1. Procédé pour l'exploitation d'une machine à imprimer à encre comprenant un réservoir (3) d'encre (30), de multiples têtes d'impression (8) pour éjecter des gouttes d'encre (31) et deux conduites d'encre (4), à savoir une conduite d'alimentation (4a) et une conduite de retour (4b), entre le réservoir et les têtes d'impression, la pression de l'encre dans au moins une des deux conduites d'encre étant mesurée par un capteur de pression (20, 21), pour lequel la machine à imprimer à encre (1) est exploitée temporairement dans un mode d'impression (M1, 41) et temporairement dans un mode de non-impression (M2, 42), et pour lequel, dans le mode de non-impression, la pression p1 dans la conduite d'alimentation (6a) est mesurée (44) avec un premier capteur de pression (20) et la pression p2 dans la conduite de retour (6b) est mesurée (44) avec un deuxième capteur de pression (21),
    caractérisé en ce
    i) que le fonctionnement temporaire de la machine en mode de non-impression (M2, 42) et la mesure des pressions p1 et p2 en mode de non-impression (M2, 42) sont utilisés pour vérifier que les deux capteurs de pression (20, 21) fonctionnent sans erreur,
    ii) que, s'il est garanti après les mesures mentionnées au point i) que les deux capteurs de pression (20, 21) mesurent correctement, la pression du ménisque sur les têtes d'impression (8) est réglée sans erreur ou ajustée, et
    iii) que, si l'action sous ii) ne résulte pas en un meilleur résultat d'impression, des têtes d'impression (8) défectueuses sont remplacées.
  2. Procédé selon la revendication 1,
    caractérisé en ce
    que, dans le mode de non-impression (M2, 42), les têtes d'impression (8) sont nettoyées (45) et de l'encre est alors éjectée, et que la mesure (44) des pressions p1 et p2 s'effectue en mode de non-impression (M2, 42) et à un moment de mesure (t), à savoir avant l'éjection d'encre ou directement avant l'éjection d'encre.
  3. Procédé selon la revendication 2,
    caractérisé en ce
    que les conduites d'encre (4a, 4b) sont remplies d'encre et que les pressions p1 et p2 sont des pressions d'encre.
  4. Procédé selon l'une des revendications 2 ou 3,
    caractérisé en ce
    que la différence de pression Δp = p1-p2 ou Δp = p2-p1 est déterminée par le calcul (46) et qu'un avertissement est émis (48) si Δρ < > ρ∗g∗Δh, où p est la densité de l'encre, g l'accélération de la pesanteur et Δh = h1-h2 ou Δh = h2-h1 la différence des hauteurs h1 et h2 des deux capteurs de pression.
  5. Procédé selon la revendication 1,
    caractérisé en ce
    qu'en mode de non-impression (M2, 42), de l'encre est ajoutée ou remplacée et, ce faisant, les conduites d'encre (4a, 4b) sont vidées par pompage (43) et en ce que la mesure (44) des pressions p1 et p2 est effectuée en mode de non-impression et à un moment de mesure (t), à savoir après le pompage à vide ou directement après le pompage à vide.
  6. Procédé selon la revendication 5,
    caractérisé en ce
    que les conduites d'encre (4a, 4b) ne sont pas sont remplies d'encre et que les pressions p1 et p2 sont des pressions d'air.
  7. Procédé selon l'une des revendications 5 ou 6,
    caractérisé en ce
    que la différence de pression Δp = p1-p2 ou Δp = p2-p1 est déterminée par le calcul (46) et qu'un avertissement est émis (48) si Δp < > 0.
  8. Procédé selon l'une des revendications précédentes,
    caractérisé en ce
    qu'il y a mise à disposition d'un calculateur (22) , qui exécute la détermination par le calcul (46), et que le calculateur démarre automatiquement la mesure (44) des pressions p1 et p2 au moment de la mesure (t).
  9. Procédé selon la revendication 8,
    caractérisé en ce
    que le calculateur (22) mémorise les valeurs des pressions p1 et p2 de plusieurs moments de mesure (t), calcule une tendance de la valeur de mesure (47) et émet un avertissement (48) si la tendance dépasse une valeur prédéfinie.
  10. Procédé selon l'une des revendications précédentes,
    caractérisé en ce
    que la pression p1 est mesurée (44) dans un répartiteur d'alimentation (6a) de la conduite d'alimentation (4a) et en ce que la pression p2 est mesurée dans un répartiteur de retour (6b) de la conduite de retour (4a).
EP19182621.3A 2019-06-26 2019-06-26 Procédé de fonctionnement d'une machine à imprimer à jet d'encre Active EP3756894B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19182621.3A EP3756894B1 (fr) 2019-06-26 2019-06-26 Procédé de fonctionnement d'une machine à imprimer à jet d'encre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19182621.3A EP3756894B1 (fr) 2019-06-26 2019-06-26 Procédé de fonctionnement d'une machine à imprimer à jet d'encre

Publications (2)

Publication Number Publication Date
EP3756894A1 EP3756894A1 (fr) 2020-12-30
EP3756894B1 true EP3756894B1 (fr) 2023-08-09

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Application Number Title Priority Date Filing Date
EP19182621.3A Active EP3756894B1 (fr) 2019-06-26 2019-06-26 Procédé de fonctionnement d'une machine à imprimer à jet d'encre

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Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2236712B (en) * 1989-10-11 1993-06-30 Linx Printing Tech Ink jet printer head flushing
WO2006064036A1 (fr) 2004-12-17 2006-06-22 Agfa Graphics Nv Systeme de circulation d’encre pour impression a jet d’encre
US8042895B2 (en) * 2008-10-31 2011-10-25 Xerox Corporation Ink conductivity recovery method for an imaging device
JP5215376B2 (ja) * 2010-12-27 2013-06-19 富士ゼロックス株式会社 液体循環装置、液体循環制御プログラム、液体吐出装置
DE102016217879A1 (de) 2016-09-19 2018-03-22 Kba-Metronic Gmbh Druckaggregat
JP7095243B2 (ja) * 2017-09-13 2022-07-05 セイコーエプソン株式会社 液体吐出装置および液体吐出装置の制御方法
JP7103770B2 (ja) * 2017-09-25 2022-07-20 東芝テック株式会社 液体循環装置、及び液体吐出装置

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