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EP2167321A1 - Method for actuating an inkjet printing device - Google Patents

Method for actuating an inkjet printing device

Info

Publication number
EP2167321A1
EP2167321A1 EP08784650A EP08784650A EP2167321A1 EP 2167321 A1 EP2167321 A1 EP 2167321A1 EP 08784650 A EP08784650 A EP 08784650A EP 08784650 A EP08784650 A EP 08784650A EP 2167321 A1 EP2167321 A1 EP 2167321A1
Authority
EP
European Patent Office
Prior art keywords
printed
printing device
inkjet printing
drive signal
inkjet
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.)
Granted
Application number
EP08784650A
Other languages
German (de)
French (fr)
Other versions
EP2167321B1 (en
Inventor
Peter Schulmeister
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.)
Manroland AG
Original Assignee
Manroland 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 Manroland AG filed Critical Manroland AG
Publication of EP2167321A1 publication Critical patent/EP2167321A1/en
Application granted granted Critical
Publication of EP2167321B1 publication Critical patent/EP2167321B1/en
Not-in-force 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
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/54—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed with two or more sets of type or printing elements
    • B41J3/546—Combination of different types, e.g. using a thermal transfer head and an inkjet print head
    • 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
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/008—Controlling printhead for accurately positioning print image on printing material, e.g. with the intention to control the width of margins
    • 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
    • B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet

Definitions

  • the invention relates to a method for controlling an inkjet printing device according to the preamble of claim 1 or 6.
  • inkjet printing devices In printing form-based, preferably operating on the offset printing principle printing machines, such. B. in web-fed rotary printing presses and sheetfed presses, find increasingly formless inkjet printing devices use, in particular the customization of printed products produced by offset printing with z. As barcodes, numbering or other markings inline for offset printing. Such inkjet printing devices have at least one inkjet printhead.
  • the present invention provides a method for driving an inkjet printing device, which operates on the so-called continuous inkjet principle.
  • Continuous inkjet inkjet printing devices provide ink droplets at a defined, constant droplet generation frequency, which droplet generation frequency is typically on the order of 10 Hz to several hundreds of kHz.
  • the movement of the printing material is effected via a sensor, typically via an encoder Displacer monitors, wherein the signal provided by the sensor according to the prior art for driving the inkjet printing device is used.
  • the frequency of the signal provided by the sensor, in particular by the encoder is dependent on the transport speed of the printing material to be printed.
  • the droplet generation frequency of the inkjet printing device there are two independent frequencies, namely firstly the droplet generation frequency of the inkjet printing device and secondly the frequency of the signal provided by the sensor, which is obtained from the monitoring of the movement of the printing substrates to be printed. Then, when the transport speed of the substrate is small, that is, when the droplet generation frequency is greater than the frequency of the signal provided by the sensor, good print quality can be provided. On the other hand, if the transport speed of the printing substrate to be printed is high, ie if the droplet generation frequency is approximately of the order of the frequency of the signal provided by the sensor, interference and beat effects can occur in the printed image, which appear as light or dark stripes in the printed image visible with the inkjet printing device to print printed image and affect the print quality. So far, no method for driving an inkjet printing device, the work according to the continuous inkjet principle known, which takes into account this problem.
  • the present invention is based on the problem to provide a novel method for driving an inkjet printing device.
  • This problem is solved according to a first aspect of the invention by a method according to claim 1.
  • the absolute position of the printing material is monitored with the aid of the sensor, wherein when the sensor detects the beginning of a print area to be printed with a relatively high print quality, the drive signal of the inkjet printing device for the subsequent, with the relatively high print quality to be printed
  • the drive signal of the inkjet printing device for the subsequent is coupled to the sensor signal.
  • this problem is solved by a method according to claim 6. After that, rasterized printed image data are provided for each printing substrate area to be printed at different resolutions, whereby rasterized printed image data are used for printing at a specific resolution depending on the speed of the substrate to be printed, and the resolution of the sensor is related to the resolution of the rasterized printed image data is adjusted.
  • band formations in the print image to be printed which result from interference and beat effects between the drop generation frequency and the frequency of the sensor signal representing the movement of the printing material to be printed can be avoided.
  • the achievable print quality can be increased.
  • 1 shows a schematic representation of an inkjet printing device
  • 2 is a schematic representation to illustrate the method according to the invention for driving an inkjet printing device according to a first aspect of the invention
  • FIG. 3 is a schematic representation to illustrate the method according to the invention for driving an inkjet printing device according to a second aspect of the invention.
  • the present invention relates to a method for controlling an inkjet printing device operating according to the continuous inkjet principle in order to place a printed image to be printed with the inkjet printing device on a printing substrate.
  • 1 highly schematically illustrates the functional principle of an inkjet printing device 10 operating according to the continuous inkjet principle, such an inkjet printing device 10 comprising a drop generator 11 which is connected to a printing ink circulation system 12 and has a defined, constant drop generation frequency provides ink drops 13.
  • an imaging signal 14 an electric field applied to a capacitor 15 is influenced in order to set the number of ink droplets 13 provided by the droplet generator 11 which are to be printed on a printing material 16 to be printed.
  • Such ink droplets 13, which are not intended to reach the printing material 16 to be printed, are deflected by the electric field applied to the capacitor 15 and returned to the ink circulation system 12.
  • a uniform stream of small ink droplets is thus produced with a constant droplet generation frequency, whereby the ink droplets either arrive at the substrate 16 to be printed or are returned to the ink circuit 12, depending on the imaging signal 14.
  • the movement or the transport of the printing material 13, which is moved in the direction of the arrow 17 according to FIG. 1, is monitored by means of a sensor, not shown, typically designed as an encoder.
  • the frequency of the signal provided by the sensor, in particular the encoder is dependent on the transport speed of the printing material 16. If only this signal provided by the sensor for controlling the inkjet printing device 10 operating according to the continuous inkjet principle is used, then, in particular if the droplet generation frequency is on the order of the frequency of the signal provided by the sensor, it may become interference and noise - Bungs binen come, which are visible as a strip in print to be printed with the inkjet printing device.
  • the present invention proposes a method for driving an operating according to the continuous inkjet principle inkjet printing device, with which the formation of such strips can be prevented.
  • Fig. 2 shows the time course of several signals, namely as the first signal 18 of the constant droplet generation frequency signal corresponding to an actuated inkjet printing device and as a second signal 19 from a sensor which monitors the printing substrate to be printed, provided signal, wherein the frequency of the signal provided by the sensor
  • two printed substrate zones 20 and 21 of the printing material to be printed are shown schematically, wherein in each of these printing substrate zones 20, 21 according to FIG. 2 a printed image 22 or 23 is to be printed in a relatively high print quality an arrow 24 is the beginning of the print area to be printed with the relatively high print quality
  • an arrow 26 shows the end of the printing material zone 20 to be printed with the relatively high print quality and the end of the printing material zone 21 to be printed with the relatively high print quality with an arrow 27.
  • the printing material zone 20 to be printed with the relatively high print quality therefore extends between the beginning 24 and the end 26 thereof.
  • the also printed with the relatively high print quality printing material zone 21 extends between the beginning 25 and the end 27 thereof.
  • the senor in particular the encoder, is used to monitor the absolute position of the printing material. Then, when the sensor detects the beginning of a printing material zone to be printed with the relatively high print quality, a drive signal 28 is provided for controlling the inkjet printing device operating according to the continuous inkjet principle for the subsequent printing material zone to be printed with the relatively high print quality coupled to the droplet generation frequency and thus to the signal 18. On the other hand, when the sensor generates the end of a printing material zone to be printed with the relatively high print quality, the drive signal 28 of the inkjet printing device is for the subsequent printing substrate zone not to be printed or for the subsequent printing material zone to be printed with the relatively low print quality the sensor signal 19 coupled.
  • FIG. 2 shows that the drive signal 28 of the inkjet printing device for the printing material zones 20, 21 to be printed with the relatively high print quality is to be printed on the signal 18 and for the printing substrate zones which are not to be printed or with the relatively low print quality Substrate zone is coupled to the signal 19.
  • the signal 28 for controlling the inkjet printing device is composed in sections either of the signal 18 of the drop generation frequency or of the signal 19 provided by the sensor. This ensures that in each printing substrate zone to be printed with the relatively high print quality, an equidistant sequence of printing drops 13 reaches the printing material to be printed. The formation of stripes in the printed image to be applied with the inkjet printing device can thus be avoided.
  • the drive signal of the inkjet printing device is coupled to the droplet generation frequency for each printing material zone of the printing substrate to be printed with the relatively high print quality in such a way that the frequency of the drive signal corresponds to the droplet generation frequency.
  • the drive signal is coupled to the droplet generation frequency in such a way that the frequency of the drive signal is coupled to the droplet generation frequency via a stem break ratio.
  • the drive signal of the inkjet printing device is coupled to the droplet generation frequency for each print substrate zone to be printed with the relatively high print quality, such that the frequency of the drive signal is above a ratio of a true break coupled to the droplet generation frequency.
  • a root breaking ratio is meant a ratio of 1: 2 or 1: 3 or 1: 4 or 1: N, where N is an integer.
  • the ratio of a true fraction means a ratio of 2: 3 or 3: 4 or 4: 5 or X: Y, where X and Y are different, integers not equal to 1.
  • the drive signal of the inkjet printing device is coupled to the sensor signal such that the frequency of the drive signal of the inkjet printing device corresponds to the frequency of the sensor signal.
  • the frequency of the drive signal is synchronized with the drop generation frequency for each printing material region of a printing material to be printed with the relatively high print quality.
  • the signal provided by the sensor serves to determine the absolute position of the beginning and end of the printing substrate zones to be printed.
  • Positioning errors that can possibly arise are compensated for in printing substrate zones that are not to be printed or in printing material zones that are to be printed with low print quality.
  • Interference patterns affecting the print quality are laid in printing substrate zones which are not to be printed or in printing material zones which are to be printed with the low print quality.
  • the scaling is not affected over the entire printing length. Changes in the transport speed of the substrate result in the smallest size changes, which are not visible to the human eye and therefore do not affect the print quality.
  • FIG. 3 wherein the left side 29 of FIG. 3, the prior art and the right side 30 of FIG. 3, the inventive method according to the second aspect the present invention relates.
  • a plurality of data sets 31 are held ready for the control of an inkjet printing device, wherein the data sets 31 are print image data screened with a defined resolution in a raster image processor.
  • the resolution of the screening of the data records 31 is adapted to the resolution of the signal of the sensor, which serves to monitor the position of the printing material to be printed. If the printing speed or transport speed of the printing material changes, as already mentioned above, undesired streaks in the printing material, which are caused by interferences between the drop generation frequency of the inkjet printing device 10 and the frequency of the signal provided by the sensor, can form ,
  • a plurality of print image data sets 31a, 31b, 31c to 31n rasterized with different resolutions in the raster image processor are provided for driving the inkjet printing device 10, wherein each of these raster resolutions a certain printing speed or transport speed of the printing material is adjusted.
  • rasterized print image data sets are provided with different resolutions, wherein a print image data set rastered for the respective speed with a specific resolution is used for printing, depending on the speed of the printing material to be printed. For printing, therefore, the print image data set is used with which the print image to be printed can best be reproduced at the current speed of the printing material.
  • the resolution of the sensor in particular of the encoder, is adapted to the resolution of the screened printed image data.
  • the resolution of the sensor is adapted to the resolution of the screened printed image data sets. This, too, can eliminate interfering interference conditions in the print image to be printed by the inkjet printing device.
  • the selection of a suitable print image data set and the selection of the resolution of the sensor thus takes place as a function of the transport speed of the printing material, which is detected metrologically or calculated from other measured values.

Landscapes

  • Ink Jet (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)
  • Coating Apparatus (AREA)

Abstract

A method for actuating an inkjet printing device that operates in accordance with the continuous inkjet principle to place a printing image, which printing image is to be printed by way of the inkjet printing device, on a printing material, where the inkjet printing device provides printing ink droplets at a defined droplet generation frequency, and where the position of the printing material which is to be printed relative to the inkjet printing device is monitored with the aid of a sensor, i.e., an encoder, to generate an actuating signal for the inkjet printing device.

Description

Verfahren zum Ansteuern einer Inkjet-Druckeinrichtung Method for controlling an inkjet printing device
Die Erfindung betrifft ein Verfahren zum Ansteuern einer Inkjet-Druckeinrichtung nach dem Oberbegriff des Anspruchs 1 bzw. 6.The invention relates to a method for controlling an inkjet printing device according to the preamble of claim 1 or 6.
In druckformbasierten, vorzugsweise nach dem Offset-Druckprinzip arbeitenden Druckmaschinen, wie z. B. in Rollenrotationsdruckmaschinen sowie Bogendruck- maschinen, finden zunehmend druckformlose Inkjet-Druckeinrichtungen Verwendung, die insbesondere der Individualisierung von über den Offsetdruck hergestellten Druckerzeugnissen mit z. B. Barcodes, Nummerierungen oder sonstigen Markierungen inline zum Offsetdruck dienen. Derartige Inkjet-Druckeinrichtungen verfügen über mindestens einen Inkjet-Druckkopf. Die hier vorliegende Erfindung ein Verfahren zum Ansteuern einer Inkjet-Druckeinrichtung, die nach dem sogenannten Continuous-Inkjet-Prinzip arbeitet.In printing form-based, preferably operating on the offset printing principle printing machines, such. B. in web-fed rotary printing presses and sheetfed presses, find increasingly formless inkjet printing devices use, in particular the customization of printed products produced by offset printing with z. As barcodes, numbering or other markings inline for offset printing. Such inkjet printing devices have at least one inkjet printhead. The present invention provides a method for driving an inkjet printing device, which operates on the so-called continuous inkjet principle.
Nach dem Continuous-Inkjet-Prinzip arbeitende Inkjet-Druckeinrichtungen stellen mit einer definierten, konstanten Tropfengenerierungsfrequenz Druckfarbetropfen bereit, wobei diese Tropfengenerierungsfrequenz üblicherweise in einer Größenordnung zwischen 10 Hz und mehreren 100 kHz liegt. Um eine nach dem Continuous-Inkjet-Prinzip arbeitende Inkjet-Druckeinrichtung derart anzusteuern, dass ein mit der Inkjet-Druckeinrichtung zu druckendes Druckbild auf einem zu bedruckenden Bedruckstoff exakt platziert wird, wird die Bewegung des Bedruckstoffs über einen Sensor, typischerweise über einen als Encoder ausgebildeten Weggeber, überwacht, wobei das vom Sensor bereitgestellte Signal nach dem Stand der Technik zur Ansteuerung der Inkjet-Druckeinrichtung verwendet wird. Die Frequenz des vom Sensor, insbesondere vom Encoder , bereitgestellten Signals ist dabei von der Transportgeschwindigkeit des zu bedruckenden Bedruckstoffs ab- hängig. Nach der Praxis liegen demnach zwei voneinander unabhängige Frequenzen vor, nämlich erstens die Tropfengenerierungsfrequenz der Inkjet-Druckeinrichtung und andererseits die Frequenz des vom Sensor bereitgestellten Signals, welches aus der Überwachung der Bewegung des zu bedruckenden Bedruckstoffe gewonnen wird. Dann, wenn die Transportgeschwindigkeit des Bedruckstoffs klein ist, wenn also die Tropfengenerierungsfrequenz größer ist als die Frequenz des vom Sensor bereitgestellten Signals, kann eine gute Druckqualität bereitgestellt werden. Dann hingegen, wenn die Transportgeschwindigkeit des zu bedruckenden Bedruckstoffs groß ist, wenn also die Tropfengenerierungsfrequenz in etwa in der Größenordnung der Frequenz des vom Sensor bereitgestellten Signals liegt, kann es zu Interferenz- und Schwebungseffekten im Druckbild kommen, die als helle oder als dunkle Streifen im mit der Inkjet-Druckeinrichtung zu druckenden Druckbild sichtbar sind und die Druckqualität beeinträchtigen. Bislang ist kein Verfahren zum An- steuern einer Inkjet-Druckeinrichtung, die nach dem Continuous-Inkjet-Prinzip arbeit, bekannt, welches diesem Problem Rechnung trägt.Continuous inkjet inkjet printing devices provide ink droplets at a defined, constant droplet generation frequency, which droplet generation frequency is typically on the order of 10 Hz to several hundreds of kHz. In order to control an inkjet printing device operating according to the continuous inkjet principle in such a way that a print image to be printed by the inkjet printing device is accurately placed on a printing material to be printed, the movement of the printing material is effected via a sensor, typically via an encoder Displacer monitors, wherein the signal provided by the sensor according to the prior art for driving the inkjet printing device is used. The frequency of the signal provided by the sensor, in particular by the encoder, is dependent on the transport speed of the printing material to be printed. According to practice, therefore, there are two independent frequencies, namely firstly the droplet generation frequency of the inkjet printing device and secondly the frequency of the signal provided by the sensor, which is obtained from the monitoring of the movement of the printing substrates to be printed. Then, when the transport speed of the substrate is small, that is, when the droplet generation frequency is greater than the frequency of the signal provided by the sensor, good print quality can be provided. On the other hand, if the transport speed of the printing substrate to be printed is high, ie if the droplet generation frequency is approximately of the order of the frequency of the signal provided by the sensor, interference and beat effects can occur in the printed image, which appear as light or dark stripes in the printed image visible with the inkjet printing device to print printed image and affect the print quality. So far, no method for driving an inkjet printing device, the work according to the continuous inkjet principle known, which takes into account this problem.
Hiervon ausgehend liegt der vorliegenden Erfindung das Problem zugrunde, ein neuartiges Verfahren zum Ansteuern einer Inkjet-Druckeinrichtung zu schaffen. Dieses Problem wird nach einem ersten Aspekt der Erfindung durch ein Verfahren gemäß Anspruch 1 gelöst. Hiernach wird mit Hilfe des Sensors die Absolutposition des Bedruckstoffs überwacht, wobei dann, wenn der Sensor den Beginn einer mit einer relativ hohen Druckqualität zu bedruckenden Bedruckstoffzone detektiert, das Ansteuersignal der Inkjet-Druckeinrichtung für die nachfolgende, mit der rela- tiv hohen Druckqualität zu bedruckende Bedruckstoffzone an die Tropfengenerierungsfrequenz gekoppelt ist, und wobei dann, wenn der Sensor das Ende einer mit der relativ hohen Druckqualität zu bedruckenden Bedruckstoffzone detektiert, das Ansteuersignal der Inkjet-Druckeinrichtung für die nachfolgende, nicht zu bedruckende oder mit einer relativ geringen Druckqualität zu bedruckende Bedruck- stoffzone an das Sensorsignal gekoppelt ist. Nach einem zweiten Aspekt wird dieses Problem durch ein Verfahren gemäß Anspruch 6 gelöst. Hiernach werden für jeden zu bedruckenden Bedruckstoffbereich mit unterschiedlichen Auflösungen gerasterte Druckbilddaten bereitgestellt, wobei abhängig von der Geschwindigkeit des zu bedruckenden Bedruckstoffs für die je- weilige Geschwindigkeit mit einer bestimmten Auflösungen gerasterte Druckbilddaten zum Drucken verwendet werden, und wobei die Auflösung des Sensors an die Auflösung der gerasterten Druckbilddaten angepasst wird.On this basis, the present invention is based on the problem to provide a novel method for driving an inkjet printing device. This problem is solved according to a first aspect of the invention by a method according to claim 1. Thereafter, the absolute position of the printing material is monitored with the aid of the sensor, wherein when the sensor detects the beginning of a print area to be printed with a relatively high print quality, the drive signal of the inkjet printing device for the subsequent, with the relatively high print quality to be printed When the sensor detects the end of a printing area to be printed with the relatively high print quality, the drive signal of the inkjet printing device for the subsequent, not to be printed or with a relatively low print quality to be printed material zone is coupled to the sensor signal. In a second aspect, this problem is solved by a method according to claim 6. After that, rasterized printed image data are provided for each printing substrate area to be printed at different resolutions, whereby rasterized printed image data are used for printing at a specific resolution depending on the speed of the substrate to be printed, and the resolution of the sensor is related to the resolution of the rasterized printed image data is adjusted.
Mit den erfindungsgemäßen Verfahren können Streifenbildungen im zu drucken- den Druckbild, die aus Interferenz- und Schwebungseffekten zwischen der Trop- fengenerierungsfrequenz und der Frequenz des die Bewegung des zu bedruckenden Bedruckstoffs repräsentierenden Sensorsignals resultieren, vermieden werden. Die erzielbare Druckqualität kann gesteigert werden.With the method according to the invention, band formations in the print image to be printed which result from interference and beat effects between the drop generation frequency and the frequency of the sensor signal representing the movement of the printing material to be printed can be avoided. The achievable print quality can be increased.
Bevorzugte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung. Ausführungsbeispiele der Erfindung werden an Hand der Zeichnung näher erläutert. Dabei zeigt:Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Embodiments of the invention will be explained in more detail with reference to the drawing. Showing:
Fig. 1 : eine schematisierte Darstellung einer Inkjet-Druckeinrichtung; Fig. 2: eine schematisierte Darstellung zur Verdeutlichung des erfindungsgemäßen Verfahrens zum Ansteuern einer Inkjet-Druckeinrichtung nach einem ersten Aspekt der Erfindung; und1 shows a schematic representation of an inkjet printing device; 2 is a schematic representation to illustrate the method according to the invention for driving an inkjet printing device according to a first aspect of the invention; and
Fig. 3: eine schematisierte Darstellung zur Verdeutlichung des erfindungsgemäßen Verfahrens zum Ansteuern einer Inkjet-Druckeinrichtung nach ei- nem zweiten Aspekt der Erfindung.3 is a schematic representation to illustrate the method according to the invention for driving an inkjet printing device according to a second aspect of the invention.
Die hier vorliegende Erfindung betrifft ein Verfahren zum Ansteuern einer nach dem Continuous-Inkjet-Prinzip arbeitenden Inkjet-Druckeinrichtung, um ein mit der Inkjet-Druckeinrichtung zu druckendes Druckbild auf einem Bedruckstoff zu plat- zieren. Fig. 1 visualisiert stark schematisiert das Funktionsprinzip einer nach den Conti- nuous-Inkjet-Prinzip arbeitenden Inkjet-Druckeinrichtung 10, wobei eine solche Inkjet-Druckeinrichtung 10 einen Tropfengenerator 11 umfasst, der an ein Druck- farbekreislaufsystem 12 angeschlossen ist und mit einer definierten, konstanten Tropfengenerierungsfrequenz Druckfarbetropfen 13 bereitstellt. Über ein Bildge- bungssignal 14 wird ein an einem Kondensator 15 anliegendes elektrisches Feld beeinflusst, um die Anzahl der vom Tropfengenerator 11 bereitgestellten Druckfarbetropfen 13, die auf einen zu bedruckenden Bedruckstoff 16 gelangen sollen, einzustellen. Solche Druckfarbetropfen 13, die nicht auf den zu bedruckenden Bedruckstoff 16 gelangen sollen, werden über das am Kondensator 15 anliegende elektrische Feld abgelenkt und dem Druckfarbekreislaufsystem 12 zurückgeführt.The present invention relates to a method for controlling an inkjet printing device operating according to the continuous inkjet principle in order to place a printed image to be printed with the inkjet printing device on a printing substrate. 1 highly schematically illustrates the functional principle of an inkjet printing device 10 operating according to the continuous inkjet principle, such an inkjet printing device 10 comprising a drop generator 11 which is connected to a printing ink circulation system 12 and has a defined, constant drop generation frequency provides ink drops 13. By means of an imaging signal 14, an electric field applied to a capacitor 15 is influenced in order to set the number of ink droplets 13 provided by the droplet generator 11 which are to be printed on a printing material 16 to be printed. Such ink droplets 13, which are not intended to reach the printing material 16 to be printed, are deflected by the electric field applied to the capacitor 15 and returned to the ink circulation system 12.
Bei einer nach dem Continuous-Inkjet-Prinzip arbeitenden Inkjet-Druckeinrichtung wird demnach mit einer konstanten Tropfengenerierungsfrequenz ein gleichmäßiger Strom aus kleinen Druckfarbetropfen erzeugt, wobei die Druckfarbetropfen abhängig vom Bildgebungssignal 14 entweder auf den zu bedruckenden Bedruckstoff 16 gelangen oder in den Druckfarbekreislauf 12 zurückgeführt werden.In an inkjet printing device operating according to the continuous inkjet principle, a uniform stream of small ink droplets is thus produced with a constant droplet generation frequency, whereby the ink droplets either arrive at the substrate 16 to be printed or are returned to the ink circuit 12, depending on the imaging signal 14.
Um Druckfarbetropfen 13 positionsgenau auf dem Bedruckstoff zu platzieren, wird die Bewegung bzw. der Transport des Bedruckstoffs 13, der gemäß Fig. 1 in Richtung des Pfeils 17 bewegt wird, mit Hilfe eines nicht-dargestellten, typischerweise als Encoder ausgebildeten Sensors überwacht. Die Frequenz des vom Sensor, insbesondere Encoder, bereitgestellten Signals ist dabei von der Transportge- schwindigkeit des Bedruckstoffs 16 abhängig. Wird ausschließlich dieses vom Sensor bereitgestellte Signal zur Ansteuerung der nach dem Continuous-Inkjet- Prinzip arbeitenden Inkjet-Druckeinrichtung 10 verwendet, so kann es insbesondere dann, wenn die Tropfengenerierungsfrequenz in der Größenordnung der Frequenz des vom Sensor bereitgestellten Signals liegt, zu Interferenz- und Schwe- bungseffekten kommen, die als Streifen im mit der Inkjet-Druckeinrichtung zu druckenden Druckbild sichtbar sind. Die hier vorliegende Erfindung schlägt ein Verfahren zum Ansteuern einer nach dem Continuous-Inkjet-Prinzip arbeitenden Inkjet-Druckeinrichtung vor, mit welchem die Ausbildung solcher Streifen verhindert werden kann.In order to place printing ink drops 13 with exact position on the printing material, the movement or the transport of the printing material 13, which is moved in the direction of the arrow 17 according to FIG. 1, is monitored by means of a sensor, not shown, typically designed as an encoder. The frequency of the signal provided by the sensor, in particular the encoder, is dependent on the transport speed of the printing material 16. If only this signal provided by the sensor for controlling the inkjet printing device 10 operating according to the continuous inkjet principle is used, then, in particular if the droplet generation frequency is on the order of the frequency of the signal provided by the sensor, it may become interference and noise - Bungseffekten come, which are visible as a strip in print to be printed with the inkjet printing device. The present invention proposes a method for driving an operating according to the continuous inkjet principle inkjet printing device, with which the formation of such strips can be prevented.
Ein erfindungsgemäßes Verfahren nach einem ersten Aspekt der hier vorliegenden Erfindung wird nachfolgend unter Bezugnahme auf Fig. 2 beschrieben.An inventive method according to a first aspect of the present invention will be described below with reference to FIG. 2.
So zeigt Fig. 2 den zeitlichen Verlauf mehrerer Signale, nämlich als erstes Signal 18 ein der konstanten Tropfengenerierungsfrequenz entsprechendes Signal einer anzusteuernden Inkjet-Druckeinrichtung und als zweites Signal 19 ein von einem Sensor, welcher der Überwachung des zu bedruckenden Bedruckstoffs dient, bereitgestelltes Signal, wobei die Frequenz des vom Sensor bereitgestellten SignalsThus, Fig. 2 shows the time course of several signals, namely as the first signal 18 of the constant droplet generation frequency signal corresponding to an actuated inkjet printing device and as a second signal 19 from a sensor which monitors the printing substrate to be printed, provided signal, wherein the frequency of the signal provided by the sensor
19 von der Geschwindigkeit des zu bedruckenden Bedruckstoffs abhängig ist.19 depends on the speed of the substrate to be printed.
Weiterhin sind schematisiert zwei zu bedruckende Bedruckstoffzonen 20 und 21 des zu bedruckenden Bedruckstoffs dargestellt, wobei in jeder dieser zu bedruckenden Bedruckstoffzonen 20, 21 gemäß Fig. 2 als Druckbild 22 bzw. 23 ein „A" in einer relativ hohen Druckqualität gedruckt werden soll. Mit einem Pfeil 24 ist der Beginn der mit der relativ hohen Druckqualität zu bedruckenden BedruckstoffzoneFurthermore, two printed substrate zones 20 and 21 of the printing material to be printed are shown schematically, wherein in each of these printing substrate zones 20, 21 according to FIG. 2 a printed image 22 or 23 is to be printed in a relatively high print quality an arrow 24 is the beginning of the print area to be printed with the relatively high print quality
20 und mit einem Pfeil 25 der Beginn der mit der relativ hohen Druckqualität zu bedruckenden Bedruckstoffzone 21 dargestellt. Mit einem Pfeil 26 ist hingegen das Ende der mit der relativ hohen Druckqualität zu bedruckenden Bedruckstoffzone 20 dargestellt und mit einem Pfeil 27 das Ende der mit der relativ hohen Druckqualität zu bedruckenden Bedruckstoffzone 21. Die mit der relativ hohen Druckqualität zu bedruckende Bedruckstoffzone 20 erstreckt sich demnach zwischen dem Beginn 24 und dem Ende 26 derselben. Die ebenfalls mit der relativ hohen Druckqualität zu bedruckende Bedruckstoffzone 21 erstreckt sich zwischen dem Beginn 25 und dem Ende 27 derselben. Zwischen dem Ende 26 der mit der relativ hohen Druckqualität zu bedruckenden Bedruckstoffzone 20 und dem Beginn 25 der mit der relativ hohen Druckqualität zu bedruckenden Bedruckstoffzone 21 liegt eine nicht zu bedruckende Bedruckstoffzone oder alternativ eine mit einer relativ geringen Druckqualität zu bedruckende Bedruckstoffzone vor. Ebenso liegt vor dem Beginn 24 der zu bedruckenden Bedruckstoffzone 20 und hinter dem Ende 27 der zu bedruckenden Bedruckstoffzone 21 eine nicht zu bedruckende Bedruckstoffzone oder alternativ eine mit einer relativ geringen Druckqualität zu bedruckende Bedruckstoffzone vor.20 and with an arrow 25, the beginning of the printed with the relatively high print quality printing material zone 21 shown. By contrast, an arrow 26 shows the end of the printing material zone 20 to be printed with the relatively high print quality and the end of the printing material zone 21 to be printed with the relatively high print quality with an arrow 27. The printing material zone 20 to be printed with the relatively high print quality therefore extends between the beginning 24 and the end 26 thereof. The also printed with the relatively high print quality printing material zone 21 extends between the beginning 25 and the end 27 thereof. Between the end 26 of the printing material zone 20 to be printed with the relatively high print quality and the beginning 25 of the printing material zone 21 to be printed with the relatively high print quality, there is a printing substrate zone not to be printed or alternatively a printing material zone to be printed with a relatively low print quality. Likewise, before the beginning of the printing substrate zone 20 to be printed and behind the end 27 of the printing material zone 21 to be printed, there is a printing substrate zone not to be printed or alternatively a printing material zone to be printed with a relatively low printing quality.
Im Sinne des erfindungsgemäßen Verfahrens nach dem ersten Aspekt der hier vorliegenden Erfindung dient der Sensor, insbesondere der Encoder, der Überwachung der Absolutposition des Bedruckstoffs. Dann, wenn der Sensor den Beginn einer mit der relativ hohen Druckqualität zu bedruckenden Bedruckstoffzone de- tektiert, ist ein Ansteuersignal 28 zur Ansteuerung der nach dem Continuous- Inkjet-Prinzip arbeitenden Inkjet-Druckeinrichtung für die nachfolgende, mit der relativ hohen Druckqualität zu bedruckende Bedruckstoffzone an die Tropfengene- rierungsfrequenz und damit an das Signal 18 gekoppelt. Dann hingegen, wenn der Sensor das Ende einer mit der relativ hohen Druckqualität zu bedruckenden Bedruckstoffzone generiert, ist das Ansteuersignal 28 der Inkjet-Druckeinrichtung für die nachfolgende, nicht zu bedruckende Bedruckstoffzone bzw. für die nachfolgende, mit der relativ geringen Druckqualität zu bedruckende Bedruckstoffzone an das Sensorsignal 19 gekoppelt.In terms of the method according to the invention according to the first aspect of the present invention, the sensor, in particular the encoder, is used to monitor the absolute position of the printing material. Then, when the sensor detects the beginning of a printing material zone to be printed with the relatively high print quality, a drive signal 28 is provided for controlling the inkjet printing device operating according to the continuous inkjet principle for the subsequent printing material zone to be printed with the relatively high print quality coupled to the droplet generation frequency and thus to the signal 18. On the other hand, when the sensor generates the end of a printing material zone to be printed with the relatively high print quality, the drive signal 28 of the inkjet printing device is for the subsequent printing substrate zone not to be printed or for the subsequent printing material zone to be printed with the relatively low print quality the sensor signal 19 coupled.
Dies visualisiert Fig. 2 mit geschweiften Klammern. So kann Fig. 2 entnommen werden, dass das Ansteuersignal 28 der Inkjet-Druckeinrichtung für die mit der relativ hohen Druckqualität zu bedruckenden Bedruckstoffzonen 20, 21 an das Signal 18 und für die nicht zu bedruckenden Bedruckstoffzonen bzw. die mit der relativ geringen Druckqualität zu bedruckende Bedruckstoffzone an das Signal 19 gekoppelt ist. Das Signal 28 zur Ansteuerung der Inkjet-Druckeinrichtung setzt sich demnach abschnittsweise entweder aus dem Signal 18 der Tropfengenerierungs- frequenz oder aus dem vom Sensor bereitgestellten Signal 19 zusammen. So wird gewährleistet, dass in jeder mit der relativ hohen Druckqualität zu bedruckenden Bedruckstoffzone eine äquidistante Folge aus Drucktropfen 13 auf den zu bedruckenden Bedruckstoff gelangt. Die Ausbildung von Streifen im mit der Ink- jet-Druckeinrichtung aufzutragenden Druckbild kann so vermieden werden.This visualized Fig. 2 with braces. Thus, FIG. 2 shows that the drive signal 28 of the inkjet printing device for the printing material zones 20, 21 to be printed with the relatively high print quality is to be printed on the signal 18 and for the printing substrate zones which are not to be printed or with the relatively low print quality Substrate zone is coupled to the signal 19. Accordingly, the signal 28 for controlling the inkjet printing device is composed in sections either of the signal 18 of the drop generation frequency or of the signal 19 provided by the sensor. This ensures that in each printing substrate zone to be printed with the relatively high print quality, an equidistant sequence of printing drops 13 reaches the printing material to be printed. The formation of stripes in the printed image to be applied with the inkjet printing device can thus be avoided.
Nach einer ersten vorteilhaften Weiterbildung des ersten Aspekts der hier vorliegenden Erfindung ist das Ansteuersignal der Inkjet-Druckeinrichtung für jede mit der relativ hohen Druckqualität zu bedruckende Bedruckstoffzone des Bedruckstoffs derart an die Tropfengenerierungsfrequenz gekoppelt, dass die Frequenz des Ansteuersignals der Tropfengenerierungsfrequenz entspricht. Nach einer zweiten, alternativen Weiterbildung ist das Ansteuersignal derart an die Tropfengenerierungsfrequenz gekoppelt, dass die Frequenz des Ansteuersignals über ein Stammbruchverhältnis an die Tropfengenerierungsfrequenz gekoppelt ist. Nach einer dritten, ebenfalls alternativen Weiterbildung des ersten Aspekts der hier vor- liegenden Erfindung ist das Ansteuersignal der Inkjet-Druckeinrichtung für jede mit der relativ hohen Druckqualität zu bedruckende Bedruckstoffzone derart an die Tropfengenerierungsfrequenz gekoppelt, dass die Frequenz des Ansteuersignals über ein Verhältnis eines echten Bruchs an die Tropfengenerierungsfrequenz gekoppelt ist.According to a first advantageous development of the first aspect of the present invention, the drive signal of the inkjet printing device is coupled to the droplet generation frequency for each printing material zone of the printing substrate to be printed with the relatively high print quality in such a way that the frequency of the drive signal corresponds to the droplet generation frequency. According to a second, alternative development, the drive signal is coupled to the droplet generation frequency in such a way that the frequency of the drive signal is coupled to the droplet generation frequency via a stem break ratio. According to a third, likewise alternative development of the first aspect of the present invention, the drive signal of the inkjet printing device is coupled to the droplet generation frequency for each print substrate zone to be printed with the relatively high print quality, such that the frequency of the drive signal is above a ratio of a true break coupled to the droplet generation frequency.
Unter einem Stammbruchverhältnis versteht man ein Verhältnis von 1 :2 oder 1 :3 oder 1 :4 bzw. 1 :N, wobei N eine ganze Zahl ist. Unter dem Verhältnis eines echten Bruchs versteht man ein Verhältnis von 2:3 oder 3:4 oder 4:5 bzw. X: Y, wobei X und Y unterschiedliche, ganze Zahlen ungleich 1 sind.By a root breaking ratio is meant a ratio of 1: 2 or 1: 3 or 1: 4 or 1: N, where N is an integer. The ratio of a true fraction means a ratio of 2: 3 or 3: 4 or 4: 5 or X: Y, where X and Y are different, integers not equal to 1.
Für jede nicht zu bedruckende Bedruckstoffzone bzw. jede mit der relativ geringen Druckqualität zu bedruckende Bedruckstoffzone ist das Ansteuersignal der Inkjet- Druckeinrichtung derart an das Sensorsignal gekoppelt, dass die Frequenz des Ansteuersignals der Inkjet-Druckeinrichtung der Frequenz des Sensorsignals ent- spricht. Nach dem ersten Aspekt der hier vorliegenden Erfindung wird demnach für jeden mit der relativ hohen Druckqualität zu bedruckenden Bedruckstoffbereich eines Bedruckstoffs die Frequenz des Ansteuersignals mit der Tropfengenerierungsfre- quenz synchronisiert. Das vom Sensor bereitgestellte Signal dient der Bestimmung der absoluten Position des Beginns und Endes von zu bedruckenden Bedruckstoffzonen.For each printing substrate zone not to be printed or any printing material zone to be printed with the relatively low print quality, the drive signal of the inkjet printing device is coupled to the sensor signal such that the frequency of the drive signal of the inkjet printing device corresponds to the frequency of the sensor signal. According to the first aspect of the present invention, therefore, the frequency of the drive signal is synchronized with the drop generation frequency for each printing material region of a printing material to be printed with the relatively high print quality. The signal provided by the sensor serves to determine the absolute position of the beginning and end of the printing substrate zones to be printed.
Positionierungsfehler, die sich eventuell ergeben können, werden in nicht zu bedruckenden Bedruckstoffzonen bzw. in mit der geringen Druckqualität zu bedru- ckenden Bedruckstoffzonen kompensiert.Positioning errors that can possibly arise are compensated for in printing substrate zones that are not to be printed or in printing material zones that are to be printed with low print quality.
Beim Drucken von z. B. Text kann mit diesem erfindungsgemäßen Verfahren sichergestellt werden, dass beim Druck von Textzeilen Druckfarbetropfen in Transportrichtung des zu bedruckenden Bedruckstoffs gesehen immer äquidistant posi- tioniert werden. Positionierungsfehler werden aufsummiert und im Zeilenzwischenraum, also einer nicht zu bedruckenden Bedruckstoffzone, kompensiert.When printing z. B. text can be ensured with this method according to the invention that when printing text lines ink droplets seen in the transport direction of the printing substrate to be printed always equidistant posi- tioned. Positioning errors are summed up and compensated in the line space, that is to say a non-printing substrate zone.
Die Druckqualität beeinträchtigende Interferenzmuster werden in nicht zu bedruckende Bedruckstoffzonen bzw. in mit der geringen Druckqualität zu bedruckende Bedruckstoffzonen verlegt. Die Skalierung wird über die gesamte Drucklänge nicht beeinträchtigt. Bei Änderungen der Transportgeschwindigkeit des Bedruckstoffs ergeben sich kleinste Größenänderungen, die für das menschliche Auge nicht sichtbar sind und demnach die Druckqualität nicht beeinträchtigen.Interference patterns affecting the print quality are laid in printing substrate zones which are not to be printed or in printing material zones which are to be printed with the low print quality. The scaling is not affected over the entire printing length. Changes in the transport speed of the substrate result in the smallest size changes, which are not visible to the human eye and therefore do not affect the print quality.
Ein erfindungsgemäßes Verfahren nach einem zweiten Aspekt der hier vorliegenden Erfindung wird nachfolgend unter Bezugnahme auf Fig. 3 beschrieben, wobei die linke Seite 29 der Fig. 3 den Stand der Technik und die rechte Seite 30 der Fig. 3 das erfindungsgemäße Verfahren nach dem zweiten Aspekt der hier vorliegenden Erfindung betrifft. Nach dem Stand der Technik (linke Seite 29 der Fig. 3) werden zur Ansteuerung einer Inkjet-Druckeinrichtung mehrere Datensätze 31 bereitgehalten, wobei es sich bei den Datensätzen 31 um mit einer definierten Auflösung in einem Rasterimageprozessor gerasterte Druckbilddaten handelt. Die Auflösung der Rasterung der Datensätze 31 ist dabei an die Auflösung des Signals des Sensors, welcher der Überwachung der Position des zu bedruckenden Bedruckstoffs dient, ange- passt. Dann, wenn sich die Druckgeschwindigkeit bzw. Transportgeschwindigkeit des Bedruckstoffs ändert, können sich, wie bereits oben ausgeführt, unerwünschte Streifen im Bedruckstoff ausbilden, die durch Interferenzen zwischen der Tropfen- generierungsfrequenz der Inkjet-Druckeinrichtung 10 und der Frequenz des vom Sensor bereitgestellten Signals verursacht sind.An inventive method according to a second aspect of the present invention will be described below with reference to FIG. 3, wherein the left side 29 of FIG. 3, the prior art and the right side 30 of FIG. 3, the inventive method according to the second aspect the present invention relates. According to the prior art (left side 29 of FIG. 3), a plurality of data sets 31 are held ready for the control of an inkjet printing device, wherein the data sets 31 are print image data screened with a defined resolution in a raster image processor. The resolution of the screening of the data records 31 is adapted to the resolution of the signal of the sensor, which serves to monitor the position of the printing material to be printed. If the printing speed or transport speed of the printing material changes, as already mentioned above, undesired streaks in the printing material, which are caused by interferences between the drop generation frequency of the inkjet printing device 10 and the frequency of the signal provided by the sensor, can form ,
Nach dem zweiten Aspekt der hier vorliegenden Erfindung (siehe rechte Seite 30 der Fig. 3) werden zur Ansteuerung der Inkjet-Druckeinrichtung 10 mehrere, mit unterschiedlichen Auflösungen im Rasterimageprozessor gerasterte Druckbilddatensätze 31a, 31b, 31c bis 31 n bereitgehalten, wobei jede dieser Rasterauflösungen an eine bestimmte Druckgeschwindigkeit bzw. Transportgeschwindigkeit des Bedruckstoffs angepasst ist.According to the second aspect of the present invention (see right side 30 of FIG. 3), a plurality of print image data sets 31a, 31b, 31c to 31n rasterized with different resolutions in the raster image processor are provided for driving the inkjet printing device 10, wherein each of these raster resolutions a certain printing speed or transport speed of the printing material is adjusted.
Für jedes Druckbild werden demnach mit unterschiedlichen Auflösungen gerastete Druckbilddatensätze bereitgestellt, wobei abhängig von der Geschwindigkeit des zu bedruckenden Bedruckstoffs ein für die jeweilige Geschwindigkeit mit einer bestimmten Auflösung gerasteter Druckbilddatensatz zum Drucken verwendet wird. Zum Drucken wird demnach derjenige Druckbilddatensatz verwendet, mit dem das zu druckende Druckbild bei der aktuellen Geschwindigkeit des Bedruckstoffs am besten wiedergegeben werden kann.For each print image, therefore, rasterized print image data sets are provided with different resolutions, wherein a print image data set rastered for the respective speed with a specific resolution is used for printing, depending on the speed of the printing material to be printed. For printing, therefore, the print image data set is used with which the print image to be printed can best be reproduced at the current speed of the printing material.
In diesem Zusammenhang ist von Bedeutung, dass die Auflösung des Sensors, insbesondere des Encoders, an die Auflösung der gerasterten Druckbilddaten an- gepasst wird. Bei Veränderung der Transportgeschwindigkeit des Bedruckstoffs wird demnach einerseits ein Druckbildsatz mit einer geänderten Auflösung zum Drucken verwendet, andererseits wird die Auflösung des Sensors an die Auflösung der gerasterten Druckbilddatensätze angepasst. Auch hiermit können störende Interferenzverhältnisse im mit der Inkjet-Druckeinrichtung zu druckenden Druckbild eliminiert werden.In this context, it is important that the resolution of the sensor, in particular of the encoder, is adapted to the resolution of the screened printed image data. When changing the transport speed of the substrate is therefore on the one hand a printed image set with a modified resolution used for printing, on the other hand, the resolution of the sensor is adapted to the resolution of the screened printed image data sets. This, too, can eliminate interfering interference conditions in the print image to be printed by the inkjet printing device.
Die Auswahl eines geeigneten Druckbilddatensatzes und die Auswahl der Auflösung des Sensors erfolgt also abhängig von der Transportgeschwindigkeit des Bedruckstoffs, die messtechnisch erfasst oder rechnerisch aus anderen Messwerten ermittelt wird. The selection of a suitable print image data set and the selection of the resolution of the sensor thus takes place as a function of the transport speed of the printing material, which is detected metrologically or calculated from other measured values.

Claims

Ansprüche claims
1. Verfahren zum Ansteuern einer nach dem Continuous-Inkjet-Prinzip arbeitenden Inkjet-Druckeinrichtung, um ein mit der Inkjet-Druckeinrichtung zu dru- ckendes Druckbild auf einem Bedruckstoff zu platzieren, wobei die Inkjet-1. A method for controlling an inkjet printing device operating according to the continuous inkjet principle in order to place a printed image to be printed with the inkjet printing device on a printing substrate, the inkjet printing device
Druckeinrichtung Druckfarbetropfen mit einer bestimmten Tropfengenerie- rungsfrequenz bereitstellt, und wobei die Position des zu bedruckenden Bedruckstoffs relativ zu der Inkjet-Druckeinrichtung mit Hilfe eines Sensors, insbesondere mit Hilfe eines Encoders, überwacht wird, um ein Ansteuersignal für die Inkjet-Druckeinrichtung zu generieren, dadurch gekennzeichnet, dass mit Hilfe des Sensors die Absolutposition des Bedruckstoffs überwacht wird, wobei dann, wenn der Sensor den Beginn einer mit einer relativ hohen Druckqualität zu bedruckenden Bedruckstoffzone detektiert, das Ansteuersignal der Inkjet-Druckeinrichtung für die nachfolgende, mit der relativ hohen Druckquali- tat zu bedruckende Bedruckstoffzone an die Tropfengenerierungsfrequenz gekoppelt ist, und wobei dann, wenn der Sensor das Ende einer mit der relativ hohen Druckqualität zu bedruckenden Bedruckstoffzone detektiert, das Ansteuersignal der Inkjet-Druckeinrichtung für die nachfolgende, nicht zu bedruckende oder mit einer relativ geringen Druckqualität zu bedruckende Bedruck- stoffzone an das Sensorsignal gekoppelt ist.Printing device ink jet droplets with a certain Tropfengenerie- frequency provides, and wherein the position of the substrate to be printed relative to the inkjet printing device by means of a sensor, in particular by means of an encoder is monitored to generate a drive signal for the inkjet printing device, characterized characterized in that with the aid of the sensor, the absolute position of the printing material is monitored, wherein when the sensor detects the beginning of a print area to be printed with a relatively high print quality, the drive signal of the inkjet printing device for the subsequent, with the relatively high print quality is coupled to printing substrate zone to the droplet generation frequency, and wherein when the sensor detects the end of a printed with the relatively high quality printing substrate zone, the drive signal of the inkjet printing device for the subsequent, not to be printed or with a printing medium zone to be printed is coupled to the sensor signal with a printing quality that is relatively low.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass das Ansteuersignal der Inkjet-Druckeinrichtung für jede mit der relativ hohen Druckqualität zu bedruckende Bedruckstoffzone derart an die Tropfengenerierungsfrequenz gekoppelt ist, dass die Frequenz des Ansteuersignals der Tropfengenerierungsfrequenz entspricht.2. The method according to claim 1, characterized in that the drive signal of the inkjet printing device is coupled for each with the relatively high print quality to be printed substrate zone to the drop generation frequency such that the frequency of the drive signal corresponds to the droplet generation frequency.
3. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass das Ansteuersignal der Inkjet-Druckeinrichtung für jede mit der relativ hohen Druckqualität zu bedruckende Bedruckstoffzone derart an die Tropfengenerierungsfrequenz gekoppelt ist, dass die Frequenz des Ansteuersignals über ein Stammbruchverhältnis an die Tropfengenerierungsfrequenz gekoppelt ist.3. The method according to claim 1, characterized in that the drive signal of the inkjet printing device for each with the relatively high print quality to be printed substrate zone in such a way to the drop generation frequency is coupled, that the frequency of the drive signal is coupled via a master fracture ratio to the droplet generation frequency.
4. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass das Ansteuersignal der Inkjet-Druckeinrichtung für jede mit der relativ hohen Druckqualität zu bedruckende Bedruckstoffzone derart an die Tropfengenerierungsfrequenz gekoppelt ist, dass die Frequenz des Ansteuersignals über ein Verhältnis eines echten Bruchs an die Tropfengenerierungsfrequenz gekoppelt ist.4. The method according to claim 1, characterized in that the drive signal of the inkjet printing device is coupled for each with the relatively high print quality to be printed substrate zone to the drop generation frequency such that the frequency of the drive signal is coupled via a ratio of a true fraction to the droplet generation frequency ,
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Ansteuersignal der Inkjet-Druckeinrichtung für jede nicht zu bedruckende bzw. für jede mit der relativ geringen Druckqualität zu bedruckende Bedruckstoffzone derart an das Sensorsignal gekoppelt ist, dass die Frequenz des Ansteuersignals der Frequenz des Sensorsignals entspricht.5. The method according to any one of claims 1 to 4, characterized in that the drive signal of the inkjet printing device for each not to be printed or for each with the relatively low print quality to be printed substrate zone is coupled to the sensor signal such that the frequency of the drive signal the frequency of the sensor signal corresponds.
6. Verfahren zum Ansteuern einer nach dem Continuous-Inkjet-Prinzip arbeitenden Inkjet-Druckeinrichtung, um ein mit der Inkjet-Druckeinrichtung zu druckendes Druckbild auf einem Bedruckstoff zu platzieren, wobei die Inkjet- Druckeinrichtung Druckfarbetropfen mit einer bestimmten Tropfengenerie- rungsfrequenz bereitstellt, und wobei die Position des zu bedruckenden Bedruckstoffs relativ zu der Inkjet-Druckeinrichtung mit Hilfe eines Sensors, insbesondere mit Hilfe eines Encoders, überwacht wird, um ein Ansteuersignal für die Inkjet-Druckeinrichtung zu generieren, dadurch gekennzeichnet, dass für jeden zu bedruckenden Bedruckstoffbereich mit unterschiedlichen Auflö- sungen gerasterte Druckbilddaten bereitgestellt werden, dass abhängig von der Geschwindigkeit des zu bedruckenden Bedruckstoffs für die jeweilige Geschwindigkeit mit einer bestimmten Auflösungen gerasterte Druckbilddaten zum Drucken verwendet werden, und dass die Auflösung des Sensors an die Auslösung der gerasterten Druckbilddaten angepasst wird. 6. A method for driving an inkjet printing device operating according to the continuous inkjet principle in order to place a printed image to be printed by the inkjet printing device on a printing substrate, wherein the inkjet printing device provides ink droplets with a specific droplet generation frequency, and wherein the position of the printing material to be printed relative to the inkjet printing device is monitored by means of a sensor, in particular by means of an encoder, in order to generate a drive signal for the inkjet printing device, characterized in that for each printing material region to be printed with different resolutions rasterized printed image data are provided, that depending on the speed of the substrate to be printed for the respective speed with a certain resolutions rasterized printed image data are used for printing, and that the resolution of the sensor to the triggering of the rasterized Print image data is adjusted.
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CA2692692A1 (en) 2009-01-15
JP2010532725A (en) 2010-10-14
CN101687421A (en) 2010-03-31
CA2692692C (en) 2011-11-22
KR101505221B1 (en) 2015-03-23
ATE487607T1 (en) 2010-11-15
EP2167321B1 (en) 2010-11-10
JP5489995B2 (en) 2014-05-14
US20100208281A1 (en) 2010-08-19
CN101687421B (en) 2011-08-03
WO2009007092A1 (en) 2009-01-15
US8310722B2 (en) 2012-11-13
KR20100028644A (en) 2010-03-12
DE502008001782D1 (en) 2010-12-23

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