EP2167321B1 - Method for actuating an inkjet printing device - Google Patents
Method for actuating an inkjet printing device Download PDFInfo
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- EP2167321B1 EP2167321B1 EP08784650A EP08784650A EP2167321B1 EP 2167321 B1 EP2167321 B1 EP 2167321B1 EP 08784650 A EP08784650 A EP 08784650A EP 08784650 A EP08784650 A EP 08784650A EP 2167321 B1 EP2167321 B1 EP 2167321B1
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- European Patent Office
- Prior art keywords
- printed
- printing
- printing device
- inkjet printing
- inkjet
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- 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
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- 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
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- 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 present invention relates to a method for driving an operating according to the continuous inkjet principle inkjet printing device to place a print image to be printed with the inkjet printing device on a substrate.
- Fig. 1 highly schematically depicts 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 provides ink droplets 13 with a defined, constant droplet generation frequency.
- an imaging signal 14 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 drop 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.
- 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 in such a way that the frequency of the drive signal is proportional to the ratio of a true break Drop generation frequency is coupled.
- 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.
- Positioning errors that may arise are compensated for in printing substrate zones that are not to be printed or in printing material zones to be printed with the low print quality.
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- Ink Jet (AREA)
- Coating Apparatus (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
- Ink Jet Recording Methods And Recording Media Thereof (AREA)
Abstract
Description
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 Bogendruckmaschinen, 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 pressure-free 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 Gontinuous-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 abhängig.Inkjet printing devices operating on the continuous inkjet principle provide ink droplets with a defined, constant droplet generation frequency, wherein this droplet generation frequency is usually of the order of magnitude of between 10 Hz and several 100 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, depends on the transport speed of the printing material to be printed.
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 Bedruckstoffs 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 Ansteuern einer Inkjet-Druckeinrichtung, die nach dem Continuous-Inkjet-Prinzip arbeit, bekannt, welches diesem Problem Rechnung trägt.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 material 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 is 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 relativ 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 Bedruckstoffzone an das Sensorsignal gekoppelt ist.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, to be printed with the relatively high print quality printing material zone wherein the droplet generation frequency is coupled, and wherein when the sensor detects the end of a print 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 substrate zone to the sensor signal is coupled.
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 jeweilige 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.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, printed image data screened for printing at a given resolution depending on the speed of the substrate to be printed, and the resolution of the sensor at the resolution of the rasterized printed image data is adjusted.
Mit den erfindungsgemäßen Verfahren können Streifenbildungen im zu druckenden Druckbild, die aus Interferenz- und Schwebungseffekten zwischen der Tropfengenerierungsfrequenz 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, banding in the printed image to be printed resulting from interference and beat effects between the droplet 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:
- Fig. 1:
- eine schematisierte Darstellung einer Inkjet-Druckeinrichtung;
- Fig. 2:
- eine schematisierte Darstellung zur Verdeutlichung des erfindungsge- mäßen Verfahrens zum Ansteuern einer Inkjet-Druckeinrichtung nach ei- nem ersten Aspekt der Erfindung; und
- Fig. 3:
- eine schematisierte Darstellung zur Verdeutlichung des erfindungsge- mäßen Verfahrens zum Ansteuern einer Inkjet-Druckeinrichtung nach ei- nem zweiten Aspekt der Erfindung.
- Fig. 1:
- a schematic representation of an inkjet printing device;
- Fig. 2:
- a schematic representation of the clarification of the inventive method for driving an inkjet printing device according to a first aspect of the invention; and
- 3:
- a schematic representation of the clarification of the inventive method 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 platzieren.The present invention relates to a method for driving an operating according to the continuous inkjet principle inkjet printing device to place a print image to be printed with the inkjet printing device on a substrate.
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, the ink droplets either being transported onto the
Um Druckfarbetropfen 13 positionsgenau auf dem Bedruckstoff zu platzieren, wird die Bewegung bzw. der Transport des Bedruckstoffs 13, der gemäß
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.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
So zeigt
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
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.Between the
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 detektiert, 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 Tropfengenerierungsfrequenz 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
Dies visualisiert
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 Inkjet-Druckeinrichtung aufzutragenden Druckbild kann so vermieden werden.This ensures that in each printing substrate zone to be printed with the relatively high print quality, an equidistant sequence of
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 vorliegenden 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 such 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 in such a way that the frequency of the drive signal is proportional to the ratio of a true break Drop generation frequency is coupled.
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 entspricht.For each print substrate zone not to be printed or each 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.
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 Tropfengenerierungsfrequenz synchronisiert. Das vom Sensor bereitgestellte Signal dient der Bestimmung der absoluten Position des Beginns und Endes von zu bedruckenden Bedruckstoffzonen.According to the first aspect of the present invention, therefore, the frequency of the drive signal is synchronized with the droplet generation frequency for each printing material region of a printing substrate 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 bedruckenden Bedruckstoffzonen kompensiert.Positioning errors that may arise are compensated for in printing substrate zones that are not to be printed or in printing material zones to be printed with the 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 positioniert 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 material to be printed always positioned equidistant. 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
Nach dem Stand der Technik (linke Seite 29 der
Nach dem zweiten Aspekt der hier vorliegenden Erfindung (siehe rechte Seite 30 der
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 angepasst wird.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.
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.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 (6)
- Method for actuating an inkjet printing device (10) that operates according to the continuous-inkjet-principle in order to place a print image that is to be printed with the inkjet printing device on a printing material (16), wherein the inkjet printing device provides printing-ink drops at a certain drop-generation frequency, and wherein the position of the printing material that is to be printed on relative to the inkjet printing device is monitored with the aid of a sensor, in particular with the aid of an encoder, in order to generate an actuation signal for the inkjet printing device, characterised in that the absolute position of the printing material is monitored with the aid of the sensor, wherein when the sensor detects the beginning of a printing-material zone (20, 21) that is to be printed on with a relatively high print quality the actuation signal of the inkjet printing device for the following printing-material zone (20, 21) that is to be printed on with the relatively high print quality is coupled to the drop-generation frequency, and wherein when the sensor detects the end of a printing-material zone that is to be printed on with the relatively high print quality the actuation signal of the inkjet printing device for the subsequent printing-material zone that is not to be printed on or is to be printed on with a relatively low print quality is coupled to the sensor signal (19).
- Method according to claim 1, characterised in that the actuation signal of the inkjet printing device for each printing-material zone that is to be printed on with the relatively high print quality is coupled to the drop-generation frequency in such a way that the frequency of the actuation signal corresponds to the drop-generation frequency.
- Method according to claim 1, characterised in that the actuation signal of the inkjet printing device for each printing-material zone that is to be printed on with the relatively high print quality is coupled to the drop-generation frequency in such a way that the frequency of the actuation signal is coupled to the drop-generation frequency by way of a unit-fraction ratio.
- Method according to claim 1, characterised in that the actuation signal of the inkjet printing device for each printing-material zone that is to be printed on with the relatively high print quality is coupled to the drop-generation frequency in such a way that the frequency of the actuation signal is coupled to the drop-generation frequency by way of a ratio of a proper fraction.
- Method according to one of claims 1 to 4, characterised in that the actuation signal of the inkjet printing device for each printing-material zone that is not to be printed on or for each printing-material zone that is to be printed on with the relatively low print quality is coupled to the sensor signal in such a way that the frequency of the actuation signal corresponds to the frequency of the sensor signal.
- Method for actuating an inkjet printing device (10) that operates according to the continuous-inkjet-principle in order to place a print image that is to be printed with the inkjet printing device on a printing material (16), wherein the inkjet printing device provides printing-ink drops at a certain drop-generation frequency, and wherein the position of the printing material that is to be printed on relative to the inkjet printing device is monitored with the aid of a sensor, in particular with the aid of an encoder, in order to generate an actuation signal for the inkjet printing device, characterised in that print-image data that are screened with different resolutions are provided for each printing-material region that is to be printed on, in that as a function of the speed of the printing material that is to be printed on print-image data are used for printing that are screened with a certain resolution for the respective speed, and in that the resolution of the sensor is matched to the resolution of the screened print-image data.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007032004A DE102007032004A1 (en) | 2007-07-09 | 2007-07-09 | Method for controlling an inkjet printing device |
PCT/EP2008/005558 WO2009007092A1 (en) | 2007-07-09 | 2008-07-08 | Method for actuating an inkjet printing device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2167321A1 EP2167321A1 (en) | 2010-03-31 |
EP2167321B1 true EP2167321B1 (en) | 2010-11-10 |
Family
ID=39731764
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08784650A Not-in-force EP2167321B1 (en) | 2007-07-09 | 2008-07-08 | Method for actuating an inkjet printing device |
Country Status (9)
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US (1) | US8310722B2 (en) |
EP (1) | EP2167321B1 (en) |
JP (1) | JP5489995B2 (en) |
KR (1) | KR101505221B1 (en) |
CN (1) | CN101687421B (en) |
AT (1) | ATE487607T1 (en) |
CA (1) | CA2692692C (en) |
DE (2) | DE102007032004A1 (en) |
WO (1) | WO2009007092A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8851638B2 (en) * | 2010-11-11 | 2014-10-07 | Eastman Kodak Company | Multiple resolution continuous ink jet system |
DE102012107664B4 (en) * | 2012-08-21 | 2014-03-06 | Manroland Web Systems Gmbh | Digital printing device for the dynamic printing of a static printed substrate web and web-fed printing press |
US10176193B2 (en) * | 2014-06-23 | 2019-01-08 | International Business Machines Corporation | Holding specific versions of a document |
DE102015104575A1 (en) * | 2015-03-26 | 2016-09-29 | Océ Printing Systems GmbH & Co. KG | Method for optimizing halftone dot positioning in digital printing |
CN110834474A (en) * | 2019-11-29 | 2020-02-25 | 大连理工大学 | Printing device and method for dripping nano material three-dimensional structure on micro-hotplate |
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JPS56148571A (en) * | 1980-04-20 | 1981-11-18 | Ricoh Co Ltd | Corrector for dot displacement in ink jet recorder |
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JPS6183046A (en) * | 1984-09-29 | 1986-04-26 | Minolta Camera Co Ltd | Ink jet recording apparatus capable of expression gradation |
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JP3168887B2 (en) * | 1995-09-27 | 2001-05-21 | ブラザー工業株式会社 | Image printing device |
JP2946201B2 (en) * | 1997-04-17 | 1999-09-06 | 株式会社東京機械製作所 | Rotary press with additional printing device and printing unit with additional printing device |
JPH11170492A (en) * | 1997-12-08 | 1999-06-29 | Toshiba Tec Corp | Printer and method for regulating printing position of printer |
DE69927755T2 (en) * | 1998-07-29 | 2006-07-06 | Seiko Epson Corp. | Printing device, its reset method and storage medium |
JP2001162807A (en) * | 1999-12-13 | 2001-06-19 | Hitachi Ltd | Ink jet recorder |
JP4240946B2 (en) * | 2001-08-10 | 2009-03-18 | キヤノン株式会社 | Inkjet recording method and inkjet recording apparatus |
JP2003154722A (en) * | 2001-11-22 | 2003-05-27 | Mitsumi Electric Co Ltd | Printer |
SG147312A1 (en) * | 2002-07-18 | 2008-11-28 | Seiko Epson Corp | Cartridge and printing apparatus |
JP2004182414A (en) * | 2002-12-04 | 2004-07-02 | Noritsu Koki Co Ltd | Image recording device |
JP3951946B2 (en) * | 2003-03-24 | 2007-08-01 | ブラザー工業株式会社 | Image sensor, reading apparatus, and resolution setting method |
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-
2007
- 2007-07-09 DE DE102007032004A patent/DE102007032004A1/en not_active Withdrawn
-
2008
- 2008-07-08 US US12/668,163 patent/US8310722B2/en not_active Expired - Fee Related
- 2008-07-08 WO PCT/EP2008/005558 patent/WO2009007092A1/en active Application Filing
- 2008-07-08 JP JP2010515402A patent/JP5489995B2/en not_active Expired - Fee Related
- 2008-07-08 CA CA2692692A patent/CA2692692C/en not_active Expired - Fee Related
- 2008-07-08 DE DE502008001782T patent/DE502008001782D1/en active Active
- 2008-07-08 EP EP08784650A patent/EP2167321B1/en not_active Not-in-force
- 2008-07-08 AT AT08784650T patent/ATE487607T1/en active
- 2008-07-08 KR KR1020107001133A patent/KR101505221B1/en active IP Right Grant
- 2008-07-08 CN CN2008800240205A patent/CN101687421B/en not_active Expired - Fee Related
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DE102007032004A1 (en) | 2009-01-15 |
DE502008001782D1 (en) | 2010-12-23 |
US8310722B2 (en) | 2012-11-13 |
ATE487607T1 (en) | 2010-11-15 |
CA2692692C (en) | 2011-11-22 |
KR20100028644A (en) | 2010-03-12 |
JP2010532725A (en) | 2010-10-14 |
JP5489995B2 (en) | 2014-05-14 |
KR101505221B1 (en) | 2015-03-23 |
CN101687421A (en) | 2010-03-31 |
EP2167321A1 (en) | 2010-03-31 |
WO2009007092A1 (en) | 2009-01-15 |
CN101687421B (en) | 2011-08-03 |
US20100208281A1 (en) | 2010-08-19 |
CA2692692A1 (en) | 2009-01-15 |
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