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EP4005805B1 - Procédé de détection d'erreurs d'éjection dans une tête d'impression à jet d'encre, système d'impression et produit logiciel - Google Patents

Procédé de détection d'erreurs d'éjection dans une tête d'impression à jet d'encre, système d'impression et produit logiciel Download PDF

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Publication number
EP4005805B1
EP4005805B1 EP20210408.9A EP20210408A EP4005805B1 EP 4005805 B1 EP4005805 B1 EP 4005805B1 EP 20210408 A EP20210408 A EP 20210408A EP 4005805 B1 EP4005805 B1 EP 4005805B1
Authority
EP
European Patent Office
Prior art keywords
liquid
pressure wave
electro
nozzle
residual pressure
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
EP20210408.9A
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German (de)
English (en)
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EP4005805A1 (fr
Inventor
Johannes M.M. Simons
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.)
Canon Production Printing Holding BV
Original Assignee
Canon Production Printing Holding BV
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Filing date
Publication date
Application filed by Canon Production Printing Holding BV filed Critical Canon Production Printing Holding BV
Priority to EP20210408.9A priority Critical patent/EP4005805B1/fr
Publication of EP4005805A1 publication Critical patent/EP4005805A1/fr
Application granted granted Critical
Publication of EP4005805B1 publication Critical patent/EP4005805B1/fr
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Anticipated expiration legal-status Critical

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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
    • B41J2/21—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
    • B41J2/0451—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
    • B41J2/015—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
    • B41J2/04581—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on piezoelectric elements
    • 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
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2002/14354—Sensor in each pressure chamber

Definitions

  • the present invention generally pertains to detecting ejection abnormalities in an inkjet print head, in particular a piezo-actuated inkjet print head.
  • the sensed residual pressure wave is compared with the residual pressure wave of a correctly functioning nozzle after manufacturing. From said comparison, a plurality of abnormalities along with their root cause can be detected, such as the presence of dirt particles, air bubbles, or dry ink.
  • the comparison with the residual pressure wave of a correctly functioning nozzle after manufacturing does not allow detecting the malfunctioning of nozzles that arises due to prolonged use of a print head. Said prolonged use may cause a drift in the behavior of one or more nozzles, which may cause ejection abnormalities such as side-shooting nozzles. These abnormalities are difficult to detect by means of a comparison of a residual pressure wave resulting from an actuation of an electro-mechanical transducer and the residual pressure wave of a correctly functioning ejection unit at the time of manufacturing. However, they may still lead to visible artifacts in the printed image.
  • a method of detecting a failing nozzle in an ejection device during the printing of a print job is provided.
  • a droplet ejection device comprising a plurality of ejection units.
  • Said ejection unit is arranged to eject droplets of a liquid and comprises one or more of nozzles, one or more liquid ducts each connected to one of the one or more nozzles, and one or more electro-mechanical transducers each arranged to create an acoustic pressure wave in the liquid in one or more ducts, and further arranged to sense a residual pressure wave in the liquid in each of the one or more ducts.
  • a software product is disclosed.
  • the method of the present invention comprises actuating the electro-mechanical transduce to generate a pressure wave in the liquid in one or more ducts. Said actuation typically causes the ejection of a liquid through the one or more nozzles in the ejection unit. Subsequently, the method of the present invention comprises sensing a residual pressure wave in the liquid in each of the one or more ducts. The sensed residual pressure wave allows performing different analyses in order to ascertain the jetting quality of an ejection unit.
  • the method of the present invention comprises comparing the residual pressure wave previously sensed in the one of the one or more ducts with the residual pressure wave of the one of the one or more ducts sensed in one or more previous executions of the method by determining the difference of one or more parameters of the residual pressure wave previously sensed and one or more parameters of the residual pressure wave sensed in one or more previous executions of the method.
  • the method of the present invention comprises determining whether the one of the one or more of nozzles is in an operative state or in a malfunctioning state, wherein the one of the one or more of nozzles is determined to be in a malfunctioning state when the difference of one or more parameters of the residual pressure wave previously sensed in the liquid of the one of one or more ducts and one or more parameters of the residual pressure wave sensed in the one of the one or more ducts in one or more previous executions of the method exceeds a predetermined threshold.
  • all of the steps of the present invention previously described are performed for more than one of the one or more liquid ducts such that a determination is made about whether each of the more than one of the one or more of nozzles is in an operative state or in a malfunctioning state by performing the comparing step for the more than one of the one or more liquid ducts with their residual pressure wave sensed in one or more previous executions of the method exceeds a predetermined threshold.
  • the method of the present invention comprises actuating the electro-mechanical transducer (28) to generate a pressure wave in the liquid in the one or more liquid ducts (16) comprises actuating the electro-mechanical transducer (28) with a waveform that causes the ejection of a droplet.
  • the method of the present invention comprises that actuating the electro-mechanical transducer to generate a pressure wave in the liquid in the one or more liquid ducts (16) comprises actuating the electro-mechanical transducer (28) with a plurality of waveforms.
  • the method of the present invention comprises that actuating the electro-mechanical transducer with a plurality of waveforms comprises actuating the electro-mechanical transducer with a plurality of waveforms with a waveform period between 0,1 milliseconds and 40 milliseconds.
  • the method of the present invention comprises that actuating the electro-mechanical transducer with a plurality of waveforms comprises actuating the electro-mechanical transducer with a plurality of identical waveforms.
  • the method of the present invention comprises that actuating the electro-mechanical transducer with a plurality of waveforms comprises actuating the electro-mechanical transducer with a plurality of different waveforms.
  • the method of the present invention comprises that wherein the electro-mechanical transducer is actuated with one or more waveforms suitable for causing the ejection of liquid.
  • the method of the present invention comprises that the one or more parameters of the residual pressure wave sensed in the liquid in each of the one or more liquid ducts comprise at least one or more of frequency, phase, amplitude, and damping factor of the residual pressure wave.
  • the method of the present invention comprises that actuating the electro-mechanical transducer to generate a pressure wave in the liquid in the one or more liquid ducts comprises actuating the electro-mechanical transducer with a different waveform or plurality of waveforms in different executions of the method.
  • the method of the present invention comprises that when it is determined in the step of determining whether the one of the one or more of nozzles is in an operative state or in a malfunctioning state that one or more of nozzles are in a malfunctioning state the method further comprises determining the root cause of the malfunctioning state based upon the difference of one or more parameters of the residual pressure wave sensed in the liquid in each of the one or more liquid ducts in the step of sensing a residual pressure wave in the liquid in the one of the one or more liquid ducts and one or more parameters of the residual pressure wave sensed in each of the one or more liquid ducts in one or more previous executions of the method exceeds a predetermined amount.
  • the method of the present invention comprises that the root cause of the malfunctioning state is one of a side-shooting nozzle, the presence of dried ink in a nozzle, the presence of excess water in the ink, the presence of water in the nozzle face, or the presence of dirt in the nozzle.
  • the present invention comprises a droplet ejection device comprising a number of ejection units arranged to eject droplets of a liquid and each comprising a nozzle, a liquid duct connected to the nozzle, and an electro-mechanical transducer arranged to create an acoustic pressure wave in the liquid in the duct, wherein each of the ejection units is associated with a processor configured to perform the method according to any of the methods of the present invention.
  • the present invention relates to a printing system comprising the droplet ejection device of the present invention as an ink jet print head and a control unit comprising a processor suitable for executing the method according to any of the methods of the present invention.
  • the present invention relates to a software product comprising program code on a machine-readable non transitory medium, the program code, when loaded into a control unit of the printing system of the present invention, causes the control unit to execute any of the methods of the present invention.
  • FIG. 1 A single ejection unit of an ink jet print head is shown in Fig. 1 .
  • the print head constitutes an example of a droplet ejection device according to the invention.
  • the device comprises a wafer 10 and a support member 12 that are bonded to opposite sides of a thin flexible membrane 14.
  • a recess that forms an ink duct 16 is formed in the face of the wafer 10 that engages the membrane 14, e.g. the bottom face in Fig. 1 .
  • the ink duct 16 has an essentially rectangular shape.
  • An end portion on the left side in Fig. 1 is connected to an ink supply line 18 that passes through the wafer 10 in thickness direction of the wafer and serves for supplying liquid ink to the ink duct 16.
  • An opposite end of the ink duct 16, on the right side in Fig. 1 is connected, through an opening in the membrane 14, to a chamber 20 that is formed in the support member 12 and opens out into a nozzle 22 that is formed in a nozzle face 24 constituting the bottom face of the support member.
  • the support member 12 Adjacent to the membrane 14 and separated from the chamber 20, the support member 12 forms another cavity 26 accommodating a piezoelectric actuator 28 that is bonded to the membrane 14.
  • An ink supply system which has not been shown here keeps the pressure of the liquid ink in the ink duct 16 slightly below the atmospheric pressure, so as to prevent the ink from leaking out through the nozzle 22.
  • the nozzle face 24 is made of or coated with a material which is wetted by the ink, so that adhesion forces cause a pool 30 of ink to be formed on the nozzle face 24 around the nozzle 22.
  • the pool 30 is delimited on the outward (bottom) side by a meniscus 32a.
  • the piezoelectric transducer 28 has electrodes 34 that are connected to an electronic circuit that has been shown in the lower part of Fig. 1 .
  • one electrode of the transducer is grounded via a line 36 and a resistor 38.
  • Another electrode of the transducer is connected to an output of an amplifier 40 that is feedback-controlled via a feedback network 42, so that a voltage V applied to the transducer will be proportional to a signal on an input line 44 of the amplifier.
  • the signal on the input line 44 is generated by a D/A-converter 46 that receives a digital input from a local digital controller 48.
  • the controller 48 is connected to a processor 50.
  • the processor 50 sends a command to the controller 48 which outputs a digital signal that causes the D/A-converter 46 and the amplifier 40 to apply an actuation pulse to the transducer 28.
  • This voltage pulse causes the transducer to deform in a bending mode. More specifically, the transducer 28 is caused to flex downward, so that the membrane 14 which is bonded to the transducer 28 will also flex downward, thereby to increase the volume of the ink duct 16. As a consequence, additional ink will be sucked-in via the supply line 18.
  • the membrane 14 will flex back into the original state, so that a positive acoustic pressure wave is generated in the liquid ink in the duct 16.
  • This pressure wave propagates to the nozzle 22 and causes an ink droplet to be expelled.
  • the pressure wave will then be reflected at the meniscus 32a and will oscillate in the cavity formed between the meniscus and the left end of the duct 16 in Fig. 1 .
  • the oscillation will be damped due to the viscosity of the ink.
  • the transducer 28 is energized with a quench pulse which has a polarity opposite to that of the actuation pulse and is timed such that the decaying oscillation will be suppressed further by destructive interference.
  • the electrodes 34 of the transducer 28 are also connected to an A/D converter 52 which measures a voltage drop across the transducer and also a voltage drop across the resistor 38 and thereby implicitly the current flowing through the transducer.
  • Corresponding digital signals S are forwarded to the controller 48 which can derive the impedance of the transducer 28 from these signals.
  • the measured electric response (current, voltage, impedance, etc.) is signaled to the processor 50 where the electric response is processed further.
  • FIG. 2 A graph showing the ratio between the amplitude measured in the residual pressure wave of a nozzle and the amplitude of a correctly jetting nozzle for a plurality of burst lengths is shown in Fig. 2 .
  • the result obtained for measurements of the amplitude of nozzles for different burst lengths can be observed in Fig. 2 .
  • the nozzles may be classified in different categories (e.g. side shooter, acceptable functioning behavior, correct functioning behavior, and non-jetting nozzle) depending upon their jetting behavior based upon the observed result while performing a printing operation.
  • side shooter acceptable functioning behavior
  • correct functioning behavior correct functioning behavior
  • non-jetting nozzle e.g. side shooter, acceptable functioning behavior, correct functioning behavior, and non-jetting nozzle
  • the method of the present invention can compare the residual pressure wave sensed in a step of the method in the one of the one or more liquid ducts with the residual pressure wave of the one or more liquid ducts sensed in one or more previous executions of the method. This process may be performed by determining the difference of one or more parameters of the residual pressure wave sensed and one or more parameters of the residual pressure wave sensed in one or more previous executions of the method. This process allows the method of the present invention to detect subtle variations in the behavior of the print heads, commonly known as drift.
  • drift drift
  • a step of comparing the residual pressure wave sensed in a step of the method in the one of the one or more liquid ducts with the residual pressure wave of the one or more liquid ducts sensed in one or more previous executions of the method can be performed for the different parameters shown in Figs, 2 to 4 or other additional factors such as damping factor.
  • the step of determining whether the one of the one or more of nozzles is in an operative state or in a malfunctioning state can be performed using information about one or more of the mentioned parameters of the residual pressure wave.
  • FIG. 3 A graph showing the ratio between the phase measured in the residual pressure wave of a nozzle and the phase of a correctly jetting nozzle for a plurality of burst lengths is shown in Fig. 3 . Further, the nozzles have been classified in four different categories (side shooter, acceptable functioning behavior, correct functioning behavior, and non-jetting nozzle) depending upon their jetting behavior based upon the observed result while performing a printing operation.
  • the method of the present invention can be applied to each and all of the plurality of nozzles of a print head.
  • the method of the present invention may comprises actuating the electro-mechanical transducer to generate a pressure wave in the liquid in the one or more liquid ducts comprises actuating the electro-mechanical transducer with a plurality of waveforms, known in the art as bursts.
  • FIG. 4 A graph showing the ratio between the frequency measured in the residual pressure wave of a nozzle and the frequency of a correctly jetting nozzle for a plurality of burst lengths is shown in Fig. 4 . Further, the nozzles have been classified in four different categories (side shooter, acceptable functioning behavior, correct functioning behavior, and non-jetting nozzle) depending upon their jetting behavior based upon the observed result while performing a printing operation.
  • the method of the present invention is able to determine whether each of the one or more of nozzles is determined to be in a malfunctioning state when the difference of one or more parameters of the residual pressure wave sensed in the liquid in each of the one or more ducts in a previous step and one or more parameters of the residual pressure wave sensed in each of the one or more ducts in one or more previous executions of the method exceeds a predetermined threshold.
  • the method of the present invention determines that one nozzle is in a malfunctioning state if the difference of one or more parameters of the residual pressure wave sensed in the liquid in each of the one or more ducts in a previous step and one or more parameters of the residual pressure wave sensed in each of the one or more ducts in one or more previous executions of the method exceed a first predetermined threshold. Further, in an embodiment the method of the present invention determines that one nozzle is in a malfunctioning state if two more parameters of the residual pressure wave sensed in each of the one or more ducts in one or more previous executions of the method exceed a second predetermined threshold, wherein said second predetermined threshold is smaller than the first predetermined threshold.
  • the method of the present invention can make determination about the jetting state based on whether a combination of parameters differ from those measured in previous executions of the method for the same nozzle more than a threshold, based on the information gathered in simulations.

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

Claims (15)

  1. Méthode de détection d'une buse défaillante dans un dispositif d'éjection comprenant un certain nombre d'unités d'éjection pendant l'impression d'un travail d'impression, chaque unité d'éjection étant conçue pour éjecter des gouttelettes d'un liquide et comprenant une buse (22), un conduit de liquide (16) relié à la buse (22), et un transducteur électromécanique (28), conçu pour créer une onde de pression acoustique dans un liquide dans le conduit de liquide (16) et conçu pour détecter une onde de pression résiduelle dans le liquide, la méthode comprenant :
    a) actionner un transducteur électromécanique (28) pour générer une onde de pression dans le liquide dans un conduit de liquide correspondant (16) ; et
    b) détection d'une onde de pression résiduelle dans le liquide dans ledit conduit de liquide (16) ; et
    c) comparer l'onde de pression résiduelle détectée à l'étape b) avec une autre onde de pression résiduelle dans le liquide du même ou d'un autre conduit de liquide (16), détectée lors d'une exécution précédente de la méthode, en déterminant la différence entre un paramètre de l'onde de pression résiduelle détectée à l'étape b) et un paramètre de l'autre onde de pression résiduelle ; et
    d) déterminer si la buse (22) correspondant audit conduit de liquide est en état de fonctionnement ou de dysfonctionnement, ladite buse (22) étant considérée comme étant en état de dysfonctionnement lorsque la différence entre ledit paramètre de l'onde de pression résiduelle détectée à l'étape b) et ledit paramètre de l'autre onde de pression résiduelle détectée lors d'une exécution précédente de la méthode dépasse un seuil prédéterminé.
  2. La méthode de la revendication 1, dans laquelle les étapes a), b), c) et d) sont exécutées pour plus d'un autre conduit de liquide (16) de sorte qu'une détermination est faite pour savoir si chacune des buses (22) qui est connectée à ces autres conduits de liquide est dans un état opérationnel ou dans un état de dysfonctionnement en exécutant l'étape de comparaison pour l'onde de pression résiduelle dans plus d'un conduit de liquide (16) comme détecté dans une ou plusieurs exécutions précédentes de la méthode.
  3. Procédé de toute revendication précédente, dans lequel l'actionnement du transducteur électromécanique (28) pour générer une onde de pression dans le liquide dans le conduit de liquide (16) comprend l'actionnement du transducteur électromécanique (28) avec une forme d'onde qui provoque l'éjection d'une gouttelette.
  4. Le procédé de toute revendication précédente, dans lequel l'actionnement du transducteur électromécanique (28) pour générer une onde de pression dans le liquide dans les conduits de liquide (16) comprend l'actionnement du transducteur électromécanique (28) avec une pluralité de formes d'onde.
  5. La méthode de la revendication 4, dans laquelle l'actionnement du transducteur électromécanique (28) avec une pluralité de formes d'onde comprend l'actionnement du transducteur électromécanique (28) avec une pluralité de formes d'onde avec une période de forme d'onde comprise entre 0,1 millisecondes et 40 millisecondes;
  6. Le procédé des revendications 4 ou 5, dans lequel l'actionnement du transducteur électromécanique (28) avec une pluralité de formes d'ondes comprend l'actionnement du transducteur électromécanique (28) avec une pluralité de formes d'ondes identiques.
  7. Le procédé des revendications 4 ou 5, dans lequel l'actionnement du transducteur électromécanique (28) avec une pluralité de formes d'ondes comprend l'actionnement du transducteur électromécanique (28) avec une pluralité de formes d'ondes différentes.
  8. Procédé de toute revendication précédente, dans lequel le transducteur électromécanique (28) est actionné avec une ou plusieurs formes d'ondes aptes à provoquer l'éjection du liquide.
  9. La méthode de toute revendication précédente, dans laquelle ledit paramètre de l'onde de pression résiduelle détectée dans le liquide dans chacun des conduits de liquide (16) comprend au moins l'un parmi la fréquence, la phase, l'amplitude et le facteur d'amortissement de l'onde de pression résiduelle.
  10. Le procédé de toute revendication précédente, dans lequel l'actionnement du transducteur électromécanique (28) pour générer une onde de pression dans le liquide dans les conduits de liquide (16) comprend l'actionnement du transducteur électromécanique (28) avec une forme d'onde différente ou une pluralité de formes d'onde dans différentes exécutions du procédé.
  11. La méthode de toute revendication précédente, dans laquelle, lorsqu'il est déterminé à l'étape d) qu'une buse (22) est dans un état de dysfonctionnement, la méthode comprend en outre une étape de détermination d'une cause fondamentale de l'état de dysfonctionnement sur la base de la différence entre ledit paramètre de l'onde de pression résiduelle détectée dans le liquide à l'étape b) et ledit paramètre de l'autre onde de pression résiduelle dans une exécution précédente de la méthode dépassant une quantité prédéterminée.
  12. La méthode de la revendication 11, dans laquelle la cause fondamentale de l'état de dysfonctionnement est l'une des suivantes : une buse à tir latéral, la présence d'encre séchée dans une buse, la présence d'un excès d'eau dans l'encre, la présence d'eau dans la face de la buse, et la présence de saletés dans la buse.
  13. Dispositif d'éjection de gouttelettes comprenant un certain nombre d'unités d'éjection agencées pour éjecter des gouttelettes d'un liquide et comprenant chacune une buse (22), un conduit de liquide (16) relié à la buse (22), et un transducteur électromécanique (28) agencé pour créer une onde de pression acoustique dans le liquide dans le conduit (16), dans lequel chacune des unités d'éjection est associée à un processeur (50) configuré pour mettre en oeuvre le procédé selon l'une quelconque des revendications 1 à 12.
  14. Système d'impression comprenant le dispositif d'éjection de gouttelettes selon la revendication 13 en tant que tête d'impression à jet d'encre et une unité de commande comprenant un processeur (50) apte à exécuter le procédé selon l'une quelconque des revendications 1 à 12.
  15. Produit logiciel comprenant un code de programme sur un support non transitoire lisible par une machine, le code de programme, lorsqu'il est chargé dans une unité de commande d'un système d'impression selon la revendication 14, amène l'unité de commande à exécuter l'un quelconque des procédés des revendications 1 à 12.
EP20210408.9A 2020-11-27 2020-11-27 Procédé de détection d'erreurs d'éjection dans une tête d'impression à jet d'encre, système d'impression et produit logiciel Active EP4005805B1 (fr)

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EP20210408.9A EP4005805B1 (fr) 2020-11-27 2020-11-27 Procédé de détection d'erreurs d'éjection dans une tête d'impression à jet d'encre, système d'impression et produit logiciel

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EP20210408.9A EP4005805B1 (fr) 2020-11-27 2020-11-27 Procédé de détection d'erreurs d'éjection dans une tête d'impression à jet d'encre, système d'impression et produit logiciel

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EP4005805B1 true EP4005805B1 (fr) 2025-01-08

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Family Cites Families (3)

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Publication number Priority date Publication date Assignee Title
CN105415888B (zh) * 2011-11-25 2017-06-06 精工爱普生株式会社 液体排出检查装置及液体排出检查方法
JP7147180B2 (ja) * 2018-02-28 2022-10-05 セイコーエプソン株式会社 液体吐出装置
EP3670188B1 (fr) * 2018-12-18 2025-02-12 Canon Production Printing Holding B.V. Procédé de détection de défaillances de buse dans une tête d'impression à jet d'encre

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