EP4417427B1 - System und verfahren für ein tintenstrahlsystem - Google Patents

System und verfahren für ein tintenstrahlsystem

Info

Publication number
EP4417427B1
EP4417427B1 EP23156473.3A EP23156473A EP4417427B1 EP 4417427 B1 EP4417427 B1 EP 4417427B1 EP 23156473 A EP23156473 A EP 23156473A EP 4417427 B1 EP4417427 B1 EP 4417427B1
Authority
EP
European Patent Office
Prior art keywords
sensing
nozzle
line
printing
signal
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
EP23156473.3A
Other languages
English (en)
French (fr)
Other versions
EP4417427C0 (de
EP4417427A1 (de
Inventor
Yoshinori Domae
Sebastian Filliger
Luca Brügger
Julien Piller
Loïc Bullot
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.)
Haute Ecole D'ingenierie Et D'architecture Fribourg
Original Assignee
Haute Ecole D'ingenierie Et D'architecture Fribourg
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 Haute Ecole D'ingenierie Et D'architecture Fribourg filed Critical Haute Ecole D'ingenierie Et D'architecture Fribourg
Priority to EP23156473.3A priority Critical patent/EP4417427B1/de
Priority to PCT/IB2024/051079 priority patent/WO2024170998A1/en
Publication of EP4417427A1 publication Critical patent/EP4417427A1/de
Application granted granted Critical
Publication of EP4417427C0 publication Critical patent/EP4417427C0/de
Publication of EP4417427B1 publication Critical patent/EP4417427B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B41J2/04541—Specific driving circuit
    • 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
    • B41J2/015—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
    • B41J2/04588—Control methods or devices therefor, e.g. driver circuits, control circuits using a specific waveform
    • 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

  • Another aim is to provide a system for inkjet printhead which is adapted to accurately discriminate several types of defects of the nozzles. It is in particular necessary to improve the sensing quality and the diversity of defects.
  • Another aim of the present invention is to provide a system for inkjet printhead allowing to automatically initiate curative or preventive operations, or compensation programs, so as to maintain a good quality of impression despite some nozzle defects. It is more particularly an aim to provide a system more reliable than the current ones, wherein defects are precisely detected and automatically compensated, limited, or avoided so that manual maintenance is limited.
  • Another aim of the invention is to provide an inkjet printer adapted to address all or part of the above-mentioned problems. It is in particular an aim to provide an inkjet printer adapted for industrial applications.
  • Another aim is to provide a method to detect, discriminate and characterized nozzle defects of an inkjet printhead in an accurate and automatic way.
  • the method is furthermore aimed at being applicable during printing operations and in automatic way.
  • Another way is to provide a method of accurately sensing a variety of nozzle defects of an inkjet printer and automatically provide adaptative responses of the printer so as to anticipate, cure or compensate such nozzle defects.
  • the system according to the present description comprises one or several sensing units each provided with a signal generator and a compensation network adapted to simulate an ideal virtual nozzle.
  • Each sensing unit is also provided with a mean to compare the current of such an ideal virtual nozzle with the one of a real nozzle and a mean to compute the signal differences so that a nozzle defect can be detected and characterized.
  • the system according to the present invention further comprises means to detect phase differences, magnitude and/or capacitance so as to improve the sensing accuracy.
  • the system allows not only to detect nozzle defects but also surrounding parameters having an impact on the impression, such as the ink characteristics, the aging, the temperature etc...
  • the present method allows to sense some or all the nozzles of a printhead during a printing operation.
  • the sensing step can occur immediately after a drop of ink is ejected.
  • non ejecting sensing can still be performed, for an improved flexibility, wherein the operator does not have to worry about unwanted drops.
  • the system comprises a printhead 1, at least one nozzle bank 10 comprising several nozzles 11 and a nozzle command unit 12 adapted to pilot the nozzles according to a determined printing operation.
  • the system also comprises at least one nozzle sensing unit 20 adapted to detect potential defects of a nozzle or a nozzle bank.
  • the system further comprises at least one printing power amplifier 30, which activates the nozzles or some of the nozzles to provide a suitable inkjet, and a printing amplifier switch 31 so as to be connected to a nozzle or a nozzle bank.
  • a nozzle bank here denotes a group or an array of several nozzles.
  • a system according to the present description can comprise 1 or 2 banks of nozzles or a higher even number of banks such as 4, 8, 16 banks. Independently of the number of banks, each nozzle can be activated by means of one or several piezoelectric actuators, better described below.
  • a pair of nozzles or a pair of nozzle banks defines a pair of nozzles or nozzle banks which are both connected to a given sensing circuit.
  • a nozzle is here understood as comprising or being combined to the necessary piezo actuator or piezo actuators, adapted to eject the ink through the nozzle.
  • the nozzle sensing unit 20 is here described in line with figure 2 . It comprises a signal generator 22 adapted to generate a sensing excitation signal to one or several nozzles.
  • the signal generator 22 can be coupled to a sensing amplifier 23.
  • the sensing amplifier 23 is designed to have low power and low noise.
  • the ensemble defined by the signal generator 22 and the sensing amplifier 23 can be disconnected or connected to a sensing line 210 by means of sensing amplifier switch 21.
  • the signal generator 22 is particularly adapted for a non-printing activation or for calibration of the corresponding nozzle or nozzle bank.
  • the sensing line 210 can be connected to the printing line 200 at the connection point 220.
  • the sensing unit 20 further comprises a mean to compare the two currents passing through the printing line 200 and through the sensing line 210.
  • a mean can be a difference amplifier 25, connected to the printing line 200 through a first connection line 240 and to the sensing line 210 through a second connection line 241.
  • the mean to compare the two currents can detect and measure difference between the two currents passing through the printing line and through the sensing line.
  • the mean to compare the two currents passing through the printing line 200 and through the sensing line 210 can be a high input common mode difference amplifier. It is understood that any suitable device adapted to compare two currents, detect a difference between two currents and/or measure such a difference can be used.
  • the printing line 200 comprises a first bypass 201 adapted to bypass the mean to compare the two currents passing through the printing line 200 and through the sensing line 210.
  • the first bypass 201 is typically activated when the corresponding printing power amplifier 30 is activated so as to operate the printing.
  • the printing line 200 further comprises a first shunt 202 adapted to connect the printing line 200 and the first connection line 240.
  • the first shunt 202 allows the mean to compare the two currents passing through the printing line 200 and through the sensing line 210 to measure the current passing through the printing line 200.
  • the first shunt 202 is activated soon after the corresponding printing power amplifier 30 is deactivated, so as to detect the residual current.
  • a sensing step can occur as soon as few microseconds after the drop ejection.
  • the switches, in particular the sensing amplifier switch 21 and the printing power amplifier switch 31 have leakage and parasitic capacitance as low as possible.
  • the sensing line 210 comprises a sensing compensation network
  • a sensing compensation network can take the form of an impedance matching circuit 24. It can comprise for example a variable capacitor 24a and a resistor 24b. It allows to mimic the current signal of a virtual nozzle having an ideal response during and/or after an activation of the corresponding nozzle 11 or nozzle bank 10.
  • the sensing compensation network can allow to mimic a virtual ideal nozzle during the activation of the corresponding printing power amplifier 30. It is however necessary that the sensing compensation network mimics an ideal virtual nozzle during the sensing period, through the activation of the corresponding signal generator 22 and sensing amplifier 23.
  • the sensing compensation network can be active permanently during a printing operation, or at least activated for the sensing step. This is particularly convenient in case of a sensing step following a printing activation step, wherein an ink drop is ejected by the corresponding nozzle 11 or nozzle bank 10.
  • the sensing compensation network can comprise or being combined with an inductive element 28.
  • an inductive element 28 is adapted to simulate the lead inductance of the cable connections which are used to connect the sensing unit 20 to the other parts of the printhead.
  • the sensing unit 20 can further comprise isolated shunt amplifiers allowing a better performance of the sensing.
  • a first isolated shunt amplifier 203 can be combined to the first shunt 202, on the printing line 200.
  • a second shunt amplifier 213 can be combined to the second shunt 212 on the sensing line 210.
  • the difference amplifier 25 thus receives the currents from the first shunt amplifier 203 and the second shunt amplifier 213 so that a more accurate measure can be performed.
  • Figures 2 represents a simplified version of figure 1 , comprising only one nozzle bank.
  • Figure 3 illustrates an embodiment wherein the present printhead comprises 2 nozzles banks 10, 10' and 2 printing power amplifiers 30, 30'.
  • the sensing line corresponds to a second printing line 200' connected to a non active nozzle bank 10' at the time when the sensed nozzle bank 10 is activated.
  • the corresponding printing power amplifiers 30' remains inactive, so that no ink is ejected.
  • the sensing unit 20 comprises a signal generator 22 and a sensing amplifier 23, which are connected to the printing line 200 by means of a sensing amplifier switch 21 and a connection point 220.
  • Figure 4 represents a similar arrangement wherein the shunts are combined with shunt amplifiers 203, 203'.
  • first shunt 202 is combined with a first shunt amplifier 203.
  • second first shunt 202' is combined with the second first shunt amplifier 203'.
  • the mean to compare the two currents passing through the printing line 200 and through the sensing line is preferably a difference amplifier 25 when the shunt amplifiers 203, 203', 213 are present.
  • it corresponds to a high input common mode difference amplifier when the circuit does not comprise the shunt amplifiers 203, 203', 213 above described.
  • the signal sensed during the observation period T3 is stored in a memory for further signal processing, for example through a signal processing unit U2, as above described, so that a response signal RS is generated.
  • the present method further comprises a computing step S3 of computing the sensed parameters so as to provide a response signal RS.
  • the signal generator 22 can discriminate the sensed defects. For examples defects such as angle jetting, non-jetting, wetting, air bubbles can be identified.
  • the sensing step S2 can further comprise a step of determining one or both of the phase and the magnitude of the pressure waves resulting from the activation step S1.
  • the phase can be determined by means of a phase comparator 260 and the corresponding arrangement above-described.
  • the amplitude can be defined by means of logarithmic amplifier 270 and the corresponding arrangement above-described.
  • the sensing step S2 can alternatively or in addition comprise a capacitance measurement.
  • a capacitance measurement can be performed by means of the capacitance measurement system CC and the corresponding arrangement above-described.
  • the CC system does the activation of the nozzle itself. This means that the sensing amplifier switches 21, 21', and the printing amplifier switches 31 and 31' are open and the capacitance switches C1 and C2 closed.
  • the present method further comprises a calibration step S0 adapted to determine the electrical characteristics of the virtual ideal nozzle.
  • the calibrating step S0 comprises an excitation of the nozzle through the corresponding signal generator 22 and a concomitant sensing of the response of the piezo-actuator or piezo actuators. The currents passing through the printing line 200 and the sensing line are compared. The characteristics of the compensation network 24, 24' are tuned so as to mimic the real nozzle.
  • the calibration step S0 can be performed according to different activation profiles depending on the parameters to be sensed. For example, the characteristics of a nozzle can be determined by exciting the corresponding nozzle according to a predetermined voltage and/or frequency so as to obtain a reference waveform of the measure response.
  • the corresponding sensing can then involve a damped oscillator function fitting with the activation parameters in real time.
  • Other methods such as Fourrier transformation, wavelet transformation can be considered.
  • wavelet transformation can be considered.
  • a frequency sweep with phase and magnitude mapping can be considered.
  • the nozzle can be excited with a sinusoidal sweep from 60KHz to 600KHz so that the magnitude and phase response can be mapped and resonance and/or antiresonance frequencies are determined.
  • a transient mode is used wherein a pulse waveform having defined low and high level, pulse width and slew rate is applied to one nozzle pf the printhead, which is preferably empty, but which can also be filed with some ink.
  • the sensing system After charging an new ink and/or when the temperature varies, the sensing system can be tuned. To this end, the set resistance can be tuned to zero, the sweep capacitive can be tuned, the capacitor value and/or the resistor value can be selected so that the sensed signal is the lowest, the sweep resistive can be tuned. Once the sensing system is tuned, the active nozzle or nozzle bank of a given pair of nozzle or nozzle bank as the same impedance that the corresponding non active nozzle or nozzle bank.
  • the calibration step S0 is performed in absence of any printing operation.
  • the printing power amplifier 30, 30' are inactive.
  • the response of a given nozzle under standard conditions can then be determined.
  • the standard conditions can vary with the type of ink, the temperature and/or any other parameters.
  • the characteristics of a nozzle can thus be determined even with an ink having unknown characteristics, and in particular rheological characteristics. This allows to adapt the calculation step to do correct sensing.
  • the rheological properties of an ink can be determined.
  • a nozzle can be excited with a sinusoidal signal over a large frequency range while preventing any drop ejection.
  • the nozzle excitation step can corresponds to the calibration activation step S0a above-described.
  • the acoustic frequency and the phase response can be mapped during concomitant sensing step, such as the calibration sensing step S0b.
  • the rheological properties of the ink can be deduced from the magnitude and phase of the responding signal. In this case, the necessary phase comparator, logarithmic amplifier and the corresponding arrangements are necessary.
  • FIG 12a represents an example of sensed signals measured during a calibration step S0.
  • the piezo drive signal PS is represented by the first diagram. It comprises an inactivation period T1 wherein the measured piezo remains at idle. It comprises a driving period T2 wherein the measure piezo is activated by means of the corresponding signal generator 23..
  • the driving period T2 can correspond to a calibration activation step S0a.
  • the driving period T2 is followed by an observation period T3 wherein the considered piezo actuator is still under excitation. It can be considered as a calibration sensing step S0b, concomitant to the excitation of the nozzle.
  • the sensed signal SS corresponds to the response over time of the excited piezo.
  • the observation period T3 allows to properly determine the electrical characteristics of an ideal virtual piezo and to tune the compensation network accordingly. It is followed by a relaxation period T4. Another period after the relaxation period T4 can be determined as a monitoring period T5. A second calibrating sensing step S0c can be performed after the relaxation period T4, during a monitoring time T5, so as to monitor the piezo.
  • the meniscus pressure can be sensed.
  • the resonance frequency of all the nozzles of the printhead can be determined and averaged. It is possible to determine the mean resonance frequencies for different known meniscus pressures so as to built a calibration table. Based on such a calibration, an unknown pressure condition can be quantified and characterized. This measurement can be improved by the rheological measurement and the capacitance measurement to compensate for ink changes (temperature, viscosity).
  • the flow rate can be determined.
  • a piezo actuator can be heated by electrical excitation.
  • the cooling effect of the flow rate can be sensed for each nozzle so as to determine the corresponding flow rate.
  • the temperature can be determined based on the piezo capacitance and the leakage current sensed by the system.
  • Such a piezo capacitance and leakage current can be determined by mean of the capacitance measurement system and the corresponding arrangement above described. The flow rate distribution over the different nozzles can thus be determined.
  • the aging of the system is determined.
  • a capacitance variation can be attributed to a certain aging of the system.
  • the corresponding aging can be deduced.
  • a mean capacitance can also be determined.
  • the capacitance can be used to identify some electronic failures.
  • parameters such as nozzle status, ink rheology characteristics, flow mapping, capacitance mapping can be sensed according to the present method. They can be individually analysed or combined so as to identify more specific parameters. The sensed parameters can be combined to other parameters originating from different sources, being integrated to the printer or remote. According to an embodiment, the data above-mentioned can be stored in a memory and computed with an artificial intelligence program.
  • the aim of such an automatic adjusting step S4 is to modulate the driving signal of a given nozzle in response to the sensed signal and potential additional data, so as to avoid or limit the manual intervention of an operator.

Landscapes

  • Ink Jet (AREA)

Claims (17)

  1. Ein Drucksystem umfassend einen Tintenstrahldruckkopf (1), mindestens eine Düse (11), die durch einen oder mehrere Piezoaktuatoren aktiviert wird, verbunden mit einem Druckerleistungsverstärker (30) über eine erste Druckerleitung (200) und einen Druckerleistungsverstärkerschalter (31) und mindestens eine Sensoreinheit (20), dadurch gekennzeichnet, dass die mindestens eine Sensoreinheit (20) umfasst:
    - eine Messleitung (210, 200'),
    - einen Signalgenerator (22), der über einen Messverstärkerschalter (21, 21') mit der Messleitung und der Druckerleitung (200) verbunden ist,
    - einen ersten Bypass (201, 201') und einen ersten Shunt (202, 202'), die auf der Druckerleitung (200) angeordnet sind,
    - einen zweiten Bypass (211) und einen zweiten Shunt (212), die auf der Messleitung angeordnet sind,
    - ein Kompensationsnetzwerk (24, 24'),
    - ein Mittel zum Vergleichen der beiden Ströme, die durch die Druckerleitung und durch die Messleitung fließen,
    sodass eine ideale virtuelle Düse simuliert werden kann und der durch die erste Druckerlinie und die Messleitung fließende Strom verglichen werden kann.
  2. Ein System gemäß Anspruch 1, ferner umfassend einen Phasenkomparator (260), der über eine erste Phasenleitung (263) mit dem Signalgenerator (22) verbunden ist und nach dem Mittel zum Vergleichen der beiden Ströme, die durch die Druckerleitung und durch die Messleitung fließen, mittels einer zweiten Phasenleitung (264) um die Phasendifferenz zwischen dem vom Signalgenerator (22) ausgegebenen Originalsignal und dem erfassten Signal bestimmen zu können.
  3. Ein System gemäß einem der Ansprüche 1 oder 2, ferner umfassend einen logarithmischen Verstärker (270), der dazu angepasst ist, eine Amplitudenantwort des erfassten Signals zu bestimmen.
  4. Ein System gemäß einem der Ansprüche 1 bis 3, ferner umfassend ein Kapazitätsmesssystem (CC), das über einen ersten Kapazitätsschalter (C1) mit der ersten Druckerleitung (200) und über einen zweiten Kapazitätsschalter (C2) mit der Messleitung verbunden ist.
  5. Ein System gemäß einem der Ansprüche 1 bis 4, wobei die Messleitung eine zweite Druckerleitung (200') bezeichnet, die über einen zweiten Druckerleistungsverstärkerschalter (31') mit einer zweiten Düse (11') verbunden ist.
  6. Ein System gemäß einem der Ansprüche 1 bis 5, wobei das Kompensationsnetzwerk (24, 24') einen variablen Kondensator (24a) und einen Widerstand (24b) umfasst.
  7. Ein System gemäß Anspruch 6, wobei das Kompensationsnetzwerk ferner ein induktives Element (28) umfasst.
  8. Ein System gemäß einem der Ansprüche 1 bis 7, wobei das Mittel zum Vergleichen der beiden Ströme, die durch die Druckerleitung und durch die Messleitung fließen, einen Differenzverstärker (25) oder einen Differenzverstärker für hohe Gleichtaktspannung bezeichnet.
  9. Ein System gemäß einem der Ansprüche 1 bis 8, wobei der erste Shunt (202, 202') mit einem ersten Shunt-Verstärker (203) kombiniert ist und der zweite Shunt mit einem zweiten Shunt-Verstärker (213, 203') kombiniert ist.
  10. Ein System gemäß einem der Ansprüche 1 bis 9, wobei jede der Düsen mit einer dedizierten Sensoreinheit (20) verbunden ist.
  11. Ein System gemäß einem der Ansprüche 1 bis 9, wobei die mindestens eine Düse (11) Teil einer Düsenbank (10) ist, die mehrere Düsen umfasst, welche mittels einer Düsensteuereinheit (12) angesteuert werden, sodass jeweils eine Düse der Düsenbank aktiviert werden kann.
  12. Ein Verfahren zum Erfassen mindestens einer Düse eines Tintenstrahldruckkopfes (1), der durch einen oder mehrere Piezoaktoren aktiviert wird, umfassend:
    - ein Aktivierungsschritt (S1), wobei die mindestens eine Düse mittels eines Druckerleistungsverstärkers (30) über eine erste Druckerleitung (200) und einen Druckerleistungsverstärkerschalter (31) aktiviert wird, und
    - ein Erfassungsschritt (S2), der unmittelbar auf den Aktivierungsschritt (S1) folgt, wobei die mindestens eine Düse nicht mehr aktiviert ist, während sie noch durch die Reaktion des Aktivierungsschritts (S1) angeregt wird,
    dadurch gekennzeichnet, dass der Erfassungsschritt (S1) das Bereitstellen eines idealen virtuellen Düsensignals über eine Messleitung (210, 200') und den Vergleich des im Aktivierungsschritt (S1) aktivierten Düsensignals mit dem idealen virtuellen Düsensignal umfasst.
  13. Ein Verfahren gemäß Anspruch 12, das zusätzlich einen Kalibrierungsschritt (S0) umfasst, der eine gleichzeitige Anregung der Düse und die Erfassung ihrer Reaktion umfasst.
  14. Ein Verfahren gemäß Anspruch 13, wobei der Kalibrierungsschritt (S0) auf der Grundlage der während des Erfassungsschritts (S2) erfassten Daten angepasst wird.
  15. Ein Verfahren gemäß einem der Ansprüche 12 oder 14, ferner umfassend einen Berechnungsschritt (S3), in dem das im Erfassungsschritt (S2) erfasste Signal in einer Signalverarbeitungseinheit (U2) berechnet wird, um ein Antwortsignal (RS) zu erzeugen, das an den erkannten Fehler angepasst ist.
  16. Ein Verfahren gemäß einem der Ansprüche 12 oder 15, ferner umfassend einen automatischen Anpassungsschritt (S4), bei dem, falls für die erfasste Düse ein Fehler erkannt wurde, automatisch eine Abhilfe eingeleitet wird, um den Fehler zu kompensieren.
  17. Ein Drucker, der das System gemäß den Ansprüchen 1 bis 11 umfasst.
EP23156473.3A 2023-02-14 2023-02-14 System und verfahren für ein tintenstrahlsystem Active EP4417427B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP23156473.3A EP4417427B1 (de) 2023-02-14 2023-02-14 System und verfahren für ein tintenstrahlsystem
PCT/IB2024/051079 WO2024170998A1 (en) 2023-02-14 2024-02-06 System and method for inkjet system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP23156473.3A EP4417427B1 (de) 2023-02-14 2023-02-14 System und verfahren für ein tintenstrahlsystem

Publications (3)

Publication Number Publication Date
EP4417427A1 EP4417427A1 (de) 2024-08-21
EP4417427C0 EP4417427C0 (de) 2025-10-01
EP4417427B1 true EP4417427B1 (de) 2025-10-01

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WO (1) WO2024170998A1 (de)

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JPS5818275A (ja) 1981-07-28 1983-02-02 Sharp Corp インクジエツト記録装置
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