EP0921008A1 - Procédé compensateur de tolérance dans une tête d'impression à jet d'encre - Google Patents

Procédé compensateur de tolérance dans une tête d'impression à jet d'encre Download PDF

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Publication number
EP0921008A1
EP0921008A1 EP98121717A EP98121717A EP0921008A1 EP 0921008 A1 EP0921008 A1 EP 0921008A1 EP 98121717 A EP98121717 A EP 98121717A EP 98121717 A EP98121717 A EP 98121717A EP 0921008 A1 EP0921008 A1 EP 0921008A1
Authority
EP
European Patent Office
Prior art keywords
print head
ink
print
module
ink print
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
EP98121717A
Other languages
German (de)
English (en)
Other versions
EP0921008B1 (fr
Inventor
Uwe Böhm
Stephan Günther
Wolfgang Dr. Thiel
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.)
Francotyp Postalia GmbH
Original Assignee
Francotyp Postalia GmbH
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 Francotyp Postalia GmbH filed Critical Francotyp Postalia GmbH
Publication of EP0921008A1 publication Critical patent/EP0921008A1/fr
Application granted granted Critical
Publication of EP0921008B1 publication Critical patent/EP0921008B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface
    • B41J25/003—Mechanisms for bodily moving print heads or carriages parallel to the paper surface for changing the angle between a print element array axis and the printing line, e.g. for dot density changes
    • 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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/14—Mounting head into the printer
    • 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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/17—Readable information on the head

Definitions

  • the invention relates to a method for tolerance compensation in a Ink printhead, especially for one of several modules the "non-interlaced" principle composite ink printhead.
  • Such ink printheads are used both in office printers and in small, fast printers - as are required for franking machines and product labeling devices - and generally have a larger number of nozzles.
  • One component that has a particularly large influence on the reliability of a printer is the ink print head. If the ink print head is composed of several components, the precise arrangement of the same with each other and with each other as well as the ink print head itself has a decisive influence on its safe function.
  • FIG. 1 shows an error-free nozzle field with the associated line print.
  • the nozzles of a nozzle row of a module are arranged equidistantly in a line.
  • Nozzles of the same atomic number, for example the nozzles 111, 121, 131 of the modules 11, 12, 13 are also arranged equidistantly in a row which is orthogonal to the direction of transport of the recording medium 6.
  • the direction of transport is indicated by the arrow.
  • the record carrier 6 is a strip, as is usually used for bulky postal items.
  • the distance ⁇ d of the nozzle with the highest atomic number, for example nozzle 117 of the module 11, to the nozzle with the lowest atomic number, for example nozzle 121, of the next module 12 in the direction orthogonal to the transport direction of the recording medium 6 is set so that it is the same Distance between adjacent nozzles of a row of nozzles in the direction mentioned. ⁇ d is the ideal or standard distance, so to speak.
  • nozzles of the same atomic number are actuated at the same time. It starts with the nozzles of the highest atomic number, 117, 127, 137.
  • the causes of these errors can on the one hand in production-related deviations in the length of the individual module - see module 12 - as well as in stress-related bending of the same - see module 11 - and on the other hand, there are manufacturing tolerances for the front panel and its slots - see module 13 -. There would also be errors due to the installation tolerances of the ink printhead attachment. Corresponding deviations from a straight continuous line can then be found in the imprint 5.
  • a method for aligning the writing nozzles of an ink print head in ink writing devices is already known, compare EP 0 257 570 A2.
  • the ink print head is moved bidirectionally in front of a recording medium by means of a drive.
  • Individual droplets are ejected from its individually controllable writing nozzles in accordance with the data taken from a character generator during its movement at defined printing times.
  • a scanning run then takes place during which the line pattern is scanned by an optical sensor which is arranged on the print head and is psychronized to the print key grid.
  • the samples are transferred to the central control of the ink writing device in the grid of the printing columns of the character matrix as the "actual" position.
  • a comparison circuit is used to compare the “actual” positions with “target” positions, which are determined by the corresponding control pulses.
  • the deviations between the two positions indicate the values for the so-called droplet offset in the grid of the printing columns.
  • the droplet offset values are stored separately in an additional memory of the central control for both writing directions.
  • the droplet offset is forwarded separately for the writing directions as a distortion value to a pixel memory also contained in the central control.
  • This method therefore requires the following for each ink writing device: an optical scanning sensor, a comparison circuit, two additional memories for droplet offset storage and two pixel memories. This is a considerable effort for a print.
  • tolerances from module to module cannot be compensated for with this solution in the case of ink print heads which are composed of several modules. The reason for this is that only a compensation is possible in advance or lagging on the relative line of movement of the writing nozzle.
  • a franking machine with an ink print head is also known, see EP 0 702 334 A1 and EP 0 702 335 A1, which has a large number of nozzles.
  • the nozzles are arranged in at least two rows which run transversely to the direction of advance of the print carrier. These two rows are offset from one another lengthwise and transversely to the feed direction, so that some first nozzles at the end of one row of nozzles are opposite some second nozzles at the end of the other row of nozzles.
  • the nozzles in the overlap area are operated alternatively. A correction of the nozzle distance is not possible.
  • a computer-controlled ink jet printing device which consists of several ink printing heads.
  • the ink print heads are arranged one behind the other in the print carrier transport direction and one above the other transversely to the same.
  • the image signals are loaded in an external memory device assigned to each individual ink print head. When the same is placed on the ink printheads, a droplet ejection and thus a printing process is triggered.
  • a timing and control system is used to apply the image signals.
  • the control system applies the image signals to the laterally offset ink printheads in a time-coordinated relationship in order to print the different lines in the desired mutual alignment.
  • the controller then stores a new set of image signals for printing the next image.
  • the inkjet printing device is provided with a programmable microprocessor by means of which the image signals are assembled in buffer memories which are individually assigned to the ink print heads.
  • the storage of the image signals in the buffers and the subsequent application to the ink print heads is carried out by means of a central timing and control device with a coarse and fine delay device. This includes the detection of the print media, such as their leading edge, at a specific location on the transport route and a subsequent time control of the start of the printing process.
  • the distance of the ink printheads from this location is precisely known, so that a buffer associated with the same can be loaded with image signals by an ink printhead during the time interval between print carrier detection and the start of the printing process.
  • the time interval can be varied by means of the control.
  • the image line generated by each ink print head can be shifted to the left or right on the print carrier in order to set the desired location of the line.
  • At least the first pressure column can thus be aligned.
  • the purpose of the invention is to reduce the effort for the improvement the print quality.
  • the invention has for its object a method for tolerance compensation to create for printheads of the type mentioned, with despite the reduced effort, both deviations within one Module as well as from module to module as well as installation tolerances of the Ink printhead can be compensated.
  • the invention is based on the consideration of reducing the expensive equipment and personnel expenditure for tolerance compensation, which was previously necessary after installation of an ink print head in a printer, in that this compensation is previously carried out externally centrally and the ink print head is implemented.
  • the ink print head is pre-compared before installation in the printer.
  • the combination of electronic and mechanical adjustment enables tolerance compensation between the modules for the first time for ink printheads that are composed of individual modules according to the "non-interlaced" principle.
  • the aids, such as scanners and central storage devices, for the adjustment are no longer an integral part of each individual printer, but are only required in the print head production or corresponding service companies. That is a significant saving.
  • the effort of a non-volatile memory and an adjustment device that is required anyway is low.
  • an arrangement for carrying out the method according to the invention consists of an ink print head 1, a memory 2, an axis 3, an adjusting device 4, a pressure control computer 7 and a scanner 8.
  • the ink print head 1 is composed of three modules 11, 12, 13.
  • the modules 11, 12, 13 are arranged one above the other in accordance with the "non-interlaced" principle.
  • the ink print head 1 is rotatably supported on the axis 3 within an adjustment range.
  • the bearing for the axis 3 can be formed directly on the housing of the ink print head 1 or indirectly contained in a crossmember for receiving the ink print head 1.
  • the adjusting device 4 consists of a threaded bushing 41, an adjusting screw 42 and a spring 43.
  • the memory 2 is an integral part of the ink print head 1 and is implemented as a non-volatile read-write memory using an EEPROM.
  • the memory 2 is connected to the pressure control computer 7 - microprocessor - via an outgoing data line 75 and an incoming data line 76.
  • the first module 11 is connected to the pressure control computer 7 via a clock line 71 and an incoming data line 74.
  • the second module 12 is connected to the pressure control computer 7 via a clock line 72.
  • the third module is connected to the pressure control computer 7 via a clock line 73.
  • the print data D are entered serially into the modules 11, 12, 13. Therefore, the data line 74 is looped through from the pressure control computer 7 via the module 11 to the module 12 to the module 13.
  • An alternative is to input the print data D directly to each module 11, 12, 13 via a parallel bus.
  • the modules 11, 12, 13 are provided in a conventional manner (not shown) with a commercially available driver circuit with a shift register and latches in front of logic elements.
  • the actuation circuits for the nozzles are triggered in accordance with the time and image information by means of the logic elements which are connected to the associated clock lines.
  • the print control computer 7 is connected to a scanner 8 via a signal line 81 for generating the individual print data or correction data I. Furthermore, the pressure control computer 7 is connected in a manner not shown to an encoder, with which the movement of the recording medium 6 is detected and converted into encoder signals E for the pressure control computer 7, see also FIG. 4. According to the invention, before the final installation of the ink print head 1 in a printing device externally, after evaluating sample prints, existing gaps at the transitions from module 11, 12 to module 12, 13 are mechanically compensated and stored by rotating the ink print head 1. Subsequently, with the help of the print control computer 7, individual print data I are generated electronically as correction data for the ink print head 1 and are stored non-volatile within the print head.
  • a first test print is generated with print data D which correspond to a virtual straight print dot line 5 which runs orthogonally to the transport direction of the recording medium 6. If the ink print head 1 is defective, the dot line 5 accordingly deviates from a straight continuous line, see FIGS. 1 and 2.
  • the test impression is checked visually for gaps in the pressure point line 5 in the transition areas of the pressure points 501 to 507, 508 to 514, 515 to 521 generated by the individual modules 11, 12, 13.
  • the ink print head 1 is rotated about the axis 3 by means of the adjustment direction 4, in particular the adjusting screw 42, until the gap between the two Pressure points 514, 515 is closed.
  • the result is checked by means of a second test impression and, if necessary, a further correction is made.
  • the twist angle see and compare in FIG. 5 dashed and continuous edges of the recording medium 6, is mechanically stored at the same time by the adjustment of the adjusting screw 42. After completion of the mechanical adjustment, the pressure line 5 is scanned by means of the scanner 8.
  • the scanning result is given in the form of the scanning signals As via the signal line 81 to the pressure control computer 7, in which the scanning signals As are compared with the printing data D and clock signals T1, T2, T3 with which the pressure dot line 5 was generated, see FIG. 4 dashed pulse trains.
  • the comparison result is entered in the form of individual print data I in the memory 2, which is integrated in the ink print head 1.
  • the individual print data I are used in print operation in the print control computer 7 to generate corrected clock signals T1, T2, T3 for actuating the ink print head 1, which are synchronized with the encoder signals E, see full line pulse sequences in FIG. 4.
  • the corrected clock signals T1, T2, T3 are input into the ink print head 1 in a serial module-related manner via the assigned clock lines 71, 72, 73.
  • the print data D are entered serially into the modules 11, 12, 13 overall via the data line 74.
  • the corrected clock signals T1, T2, T3 can also be given individually to the inkjet print head 1; that would require a parallel bus for the clock lines. If overlaps of pressure points 507, 508 in the pressure point line as a result of the rotation are determined in the test print after the mechanical adjustment, the relevant individual print data I contain information on excluding a nozzle 121 from the printing operation, see FIG. 4.
  • nozzle 121 is electronic for printing blocked.

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  • Ink Jet (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP98121717A 1997-12-04 1998-11-14 Procédé compensateur de tolérance dans une tête d'impression à jet d'encre Expired - Lifetime EP0921008B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19755874A DE19755874C1 (de) 1997-12-04 1997-12-04 Verfahren zum Toleranzausgleich bei einem aus mehreren Modulen nach dem Non-Interlaced-Prinzip zusammengesetzten Tintendruckkopf
DE19755874 1997-12-04

Publications (2)

Publication Number Publication Date
EP0921008A1 true EP0921008A1 (fr) 1999-06-09
EP0921008B1 EP0921008B1 (fr) 2002-08-28

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EP98121717A Expired - Lifetime EP0921008B1 (fr) 1997-12-04 1998-11-14 Procédé compensateur de tolérance dans une tête d'impression à jet d'encre

Country Status (3)

Country Link
US (1) US6457800B1 (fr)
EP (1) EP0921008B1 (fr)
DE (2) DE19755874C1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002034538A1 (fr) * 2000-10-20 2002-05-02 Silverbrook Research Pty Ltd Procede de montage d'une tete d'impression modulaire a jet d'encre six couleurs
EP1216838A1 (fr) * 2000-12-22 2002-06-26 Agfa-Gevaert Imprimante à jet d'encre avec des ensembles de buses qui peuvent se déplacer mutuellement
EP1386749A1 (fr) * 2002-08-02 2004-02-04 Hewlett-Packard Development Company, L.P. Réduction du défaut d'alignement d'un ensemble d'éjecteurs de fluide décalé
US6733194B2 (en) 2002-07-04 2004-05-11 Francotyp-Postalia Ag & Co. Kg Arrangement for controlling printing in a mail-processing device
US6739245B2 (en) 2002-07-04 2004-05-25 Francotyp-Postalia Ag & Co. Kg Method for controlling printing in a mail-processing device
US6776544B2 (en) 2002-10-31 2004-08-17 Francotyp-Postalia Ag & Co. Kg Arrangement for printing a print image having regions with different print image resolution
US6796731B2 (en) 2000-05-23 2004-09-28 Silverbrook Research Pty Ltd Laminated ink distribution assembly for a printer
EP1479520A1 (fr) * 2001-09-17 2004-11-24 Toshiba Tec Kabushiki Kaisha Tête d'enregistrement et appareil d'enregistrement l'utilisant
US6984080B2 (en) 2000-05-23 2006-01-10 Silverbrook Research Pty Ltd Laminated distribution structure
US6988840B2 (en) 2000-05-23 2006-01-24 Silverbrook Research Pty Ltd Printhead chassis assembly
EP1875403A2 (fr) * 2005-04-25 2008-01-09 Litrex Corporation Jeu ordonne de tetes d'impression rotatives
US7824021B2 (en) 2000-05-23 2010-11-02 Silverbrook Research Pty Ltd Printhead assembly with printheads within a laminated stack which, in turn is within an ink distribution structure

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AUPQ595900A0 (en) 2000-03-02 2000-03-23 Silverbrook Research Pty Ltd Modular printhead
DE10057063C1 (de) * 2000-11-17 2002-05-08 Koenig & Bauer Ag Druckvorrichtung
US6663222B2 (en) * 2000-12-22 2003-12-16 Agfa-Gevaert Ink jet printer with nozzle arrays that are moveable with respect to each other
US6554398B2 (en) * 2001-03-08 2003-04-29 Agfa-Gevaert Ink-jet printer equipped for aligning the printheads
US6814421B2 (en) * 2002-10-24 2004-11-09 Hewlett-Packard Development Company, L.P. Printing device and method
US6869162B2 (en) 2003-03-27 2005-03-22 Hewlett-Packard Development Company, L.P. Printing device and method for servicing same
US7661791B2 (en) 2004-06-30 2010-02-16 Lexmark International, Inc. Apparatus and method for performing mechanical printhead alignment in an imaging apparatus
KR100677579B1 (ko) * 2005-04-26 2007-02-02 삼성전자주식회사 잉크젯 화상형성장치
EP1764226B1 (fr) * 2005-09-20 2009-08-19 Agfa Graphics N.V. Dispostif et méthode d'alignement automatique de rangés d'éléments d'impression
KR100911253B1 (ko) 2007-05-18 2009-08-06 삼성전기주식회사 잉크젯 프린터를 이용한 인쇄방법
JP5106210B2 (ja) * 2008-03-28 2012-12-26 富士フイルム株式会社 画像形成装置、記録ヘッド調整方法
DE102010036957B4 (de) 2010-08-12 2013-07-11 OCé PRINTING SYSTEMS GMBH Druckvorrichtung mit versetzten Druckköpfen und Verfahren zum Einrichten dieser Druckvorrichtung
WO2017011004A1 (fr) * 2015-07-15 2017-01-19 Hewlett-Packard Development Company, L.P. Étalonnage d'imprimante
DE202017106430U1 (de) 2017-10-24 2018-10-25 Francotyp-Postalia Gmbh Gutverarbeitungsgerät
JP7517032B2 (ja) * 2020-09-29 2024-07-17 セイコーエプソン株式会社 ヘッド昇降装置、ヘッド昇降装置の制御方法、プログラム、ヘッド昇降装置の製造方法
CN113002174A (zh) * 2021-03-10 2021-06-22 浙江普崎数码科技有限公司 一种高密度喷墨打印机

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EP0775587A1 (fr) * 1995-11-21 1997-05-28 Hewlett-Packard Company Alignement d'une tête d'impression à jet d'encre par la mesure d'erreurs et une mémoire de données

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WO1995007185A1 (fr) * 1993-09-09 1995-03-16 Xaar Limited Appareil de depot de gouttelettes
DE19511416A1 (de) * 1994-03-28 1995-11-02 Seiko Epson Corp Mechanismus und Verfahren zur Justage der Kopfposition in Tintenstrahldruckern
EP0775587A1 (fr) * 1995-11-21 1997-05-28 Hewlett-Packard Company Alignement d'une tête d'impression à jet d'encre par la mesure d'erreurs et une mémoire de données

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US6997625B2 (en) 2000-05-23 2006-02-14 Silverbrook Research Pty Ltd Ink distribution assembly
US6988840B2 (en) 2000-05-23 2006-01-24 Silverbrook Research Pty Ltd Printhead chassis assembly
US7083258B2 (en) 2000-05-23 2006-08-01 Silverbrook Research Pty Ltd Printhead assembly
US7114868B2 (en) 2000-05-23 2006-10-03 Silverbrook Research Pty Ltd Inkjet printing assembly with multi-purpose platen assembly
US7425053B2 (en) 2000-05-23 2008-09-16 Silverbrook Research Pty Ltd Printhead assembly with a laminated ink distribution assembly
US7841710B2 (en) 2000-05-23 2010-11-30 Silverbrook Research Pty Ltd Printhead assembly with a pressurized air supply for an inkjet printer
US6796731B2 (en) 2000-05-23 2004-09-28 Silverbrook Research Pty Ltd Laminated ink distribution assembly for a printer
US7364377B2 (en) 2000-05-23 2008-04-29 Silverbrook Research Pty Ltd Print engine assembly with an elongate converging ink distribution assembly
US6984080B2 (en) 2000-05-23 2006-01-10 Silverbrook Research Pty Ltd Laminated distribution structure
US7658467B2 (en) 2000-05-23 2010-02-09 Silverbrook Research Pty Ltd Printhead assembly laminated ink distribution stack
US6994419B2 (en) 2000-05-23 2006-02-07 Silverbrook Research Pty Ltd Multi-function printhead platen
US6997626B2 (en) 2000-05-23 2006-02-14 Silverbrook Research Pty Ltd Ink and air distribution within a printer assembly
US7980658B2 (en) 2000-05-23 2011-07-19 Silverbrook Research Pty Ltd Rotatable platen
US7824021B2 (en) 2000-05-23 2010-11-02 Silverbrook Research Pty Ltd Printhead assembly with printheads within a laminated stack which, in turn is within an ink distribution structure
US7748833B2 (en) 2000-05-23 2010-07-06 Silverbrook Research Pty Ltd Ink distribution structure with a laminated ink supply stack for an inkjet printer
US7740338B2 (en) 2000-05-23 2010-06-22 Silverbrook Research Pty Ltd Printhead assembly having a pressurised air supply
US7325986B2 (en) 2000-05-23 2008-02-05 Silverbrook Research Pty Ltd Printhead assembly with stacked ink distribution sheets
US7328994B2 (en) 2000-05-23 2008-02-12 Silverbrook Research Pty Ltd Print engine assembly with slotted chassis
WO2002034538A1 (fr) * 2000-10-20 2002-05-02 Silverbrook Research Pty Ltd Procede de montage d'une tete d'impression modulaire a jet d'encre six couleurs
EP1216838A1 (fr) * 2000-12-22 2002-06-26 Agfa-Gevaert Imprimante à jet d'encre avec des ensembles de buses qui peuvent se déplacer mutuellement
EP1479520A1 (fr) * 2001-09-17 2004-11-24 Toshiba Tec Kabushiki Kaisha Tête d'enregistrement et appareil d'enregistrement l'utilisant
US6733194B2 (en) 2002-07-04 2004-05-11 Francotyp-Postalia Ag & Co. Kg Arrangement for controlling printing in a mail-processing device
US6739245B2 (en) 2002-07-04 2004-05-25 Francotyp-Postalia Ag & Co. Kg Method for controlling printing in a mail-processing device
EP1386749A1 (fr) * 2002-08-02 2004-02-04 Hewlett-Packard Development Company, L.P. Réduction du défaut d'alignement d'un ensemble d'éjecteurs de fluide décalé
US6776544B2 (en) 2002-10-31 2004-08-17 Francotyp-Postalia Ag & Co. Kg Arrangement for printing a print image having regions with different print image resolution
EP1875403A2 (fr) * 2005-04-25 2008-01-09 Litrex Corporation Jeu ordonne de tetes d'impression rotatives

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Publication number Publication date
DE19755874C1 (de) 1999-07-15
US6457800B1 (en) 2002-10-01
DE59805302D1 (de) 2002-10-02
EP0921008B1 (fr) 2002-08-28

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