EP0921009A1 - Dispositif compensateur de tolérance dans une tête d'impression à jet d'encre - Google Patents

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

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Publication number
EP0921009A1
EP0921009A1 EP98121718A EP98121718A EP0921009A1 EP 0921009 A1 EP0921009 A1 EP 0921009A1 EP 98121718 A EP98121718 A EP 98121718A EP 98121718 A EP98121718 A EP 98121718A EP 0921009 A1 EP0921009 A1 EP 0921009A1
Authority
EP
European Patent Office
Prior art keywords
print head
ink
ink print
module
memory
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.)
Ceased
Application number
EP98121718A
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German (de)
English (en)
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 EP0921009A1 publication Critical patent/EP0921009A1/fr
Ceased 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
    • B41J2202/17—Readable information on the head

Definitions

  • the invention relates to an arrangement 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 be due to production-related deviations in the length of the individual module - see module 12 - as well as stress-related bending of the same - see module 11 - and on the other hand, there are manufacturing tolerances of 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 matching 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 printer advance takes place, during which a defined line pattern is printed on the recording medium separately for each writing nozzle for each writing direction - counterclockwise, clockwise rotation.
  • 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 staggered along and across 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 printheads.
  • 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 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 an arrangement for tolerance compensation for ink printheads of the type mentioned at the beginning create with both deviations despite reduced effort within a module as well as from module to module as well as installation tolerances of the ink print head can be compensated.
  • each ink print head is provided with an integrated non-volatile read-write memory which contains its individual print data
  • the ink print head is electronically pre-balanced before it is installed in the printer.
  • the individual print data contain the cycle delay values, either module or single nozzle-related. Since the ink print head is rotatably mounted, a correction from module to module by varying the installation angle of the ink print head to the direction of transport is possible by means of the adjusting device. Here, too, mechanical pre-adjustment is possible even before the ink print head is installed.
  • the maximum rotation is such that nozzles overlap in the connection area from module to module and then one of them is electronically excluded from printing. With larger numbers of nozzles, this cannot be determined in the printed image and is therefore justified. After installation of the ink print head in the printer, if necessary, slight installation tolerances can still be adjusted using the adjustment device.
  • the arrangement according to the invention consists of an ink print head 1, a memory 2, an axis 3 and an adjustment device 4.
  • 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 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.
  • Individual print data of the ink print head 1 are stored in the memory 2.
  • the individual print data are generated externally before the ink print head is installed in a printing device by evaluating sample prints.
  • the individual print data contain corresponding positive or negative delay values for the clocks for controlling the modules as a whole or the nozzles as individual.
  • the individual data can also be such that a nozzle is excluded from printing.
  • 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. It serves to rotate the ink print head 1 within the adjusting area.
  • the ink print head 1 is non-positively against the adjusting screw 42 under the action of the spring 43.
  • the adjusting device 4 can expediently also be fastened on the crossmember mentioned.
  • 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 13 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 via a parallel bus.
  • the ink print head 1 or the modules 11, 12, 13 is / are provided in a 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 links on which the assigned clock lines with the corrected clocks T1 to T3 are applied.
  • the print control computer 7 is connected to a scanner 8 via a signal line 81 for generating the correction data or the individual print data 1. If gaps in the impression 5, such as the height offset v between the dot 514 and 515, which go beyond the standard ⁇ d, are found during a first test print, the ink print head 1 is in this case rotated to the left until the connection is made in the vertical direction.
  • the angle of rotation is already mechanically stored when the adjusting screw 42 is turned.
  • the newly generated impression 5 is scanned and the scanning signals As are fed to the pressure control computer 7 in relation to the dot or nozzle.
  • the scanning signals As are compared in the pressure control computer 7 with standard values already stored therein and the deviations are converted into signed correction data 1 and entered into the memory 2 via the data line 76 in an address-related manner.
  • it is also possible to dispense with the sign part if only delay values are generated in relation to the most lagging dot, for example dot 515 or 521 in FIG. 2.
  • the offset v in the transport direction from module 13 to module 12 is somewhat smaller than the corresponding nozzle spacing ⁇ s.
  • the correction data or individual print data I are loaded into the memory 2 via the data line 76.
  • the ink print head 1 is thus also electronically adjusted.
  • the individual print data 1 are retrieved via the data line 75 by the microprocessor 7 from the EEPROM 2 and incorporated in the generation of the clocks T1, T2, T3.
  • FIG. 5 is one according to the procedure described above corrected line print of the faulty nozzle field according to FIG. 2 shown.
  • the nozzle 121 is for printing electronically locked.

Landscapes

  • Ink Jet (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP98121718A 1997-12-04 1998-11-14 Dispositif compensateur de tolérance dans une tête d'impression à jet d'encre Ceased EP0921009A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19755873 1997-12-04
DE1997155873 DE19755873C2 (de) 1997-12-04 1997-12-04 Anordnung zum Toleranzausgleich bei einem Tintendruckkopf

Publications (1)

Publication Number Publication Date
EP0921009A1 true EP0921009A1 (fr) 1999-06-09

Family

ID=7852093

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98121718A Ceased EP0921009A1 (fr) 1997-12-04 1998-11-14 Dispositif compensateur de tolérance dans une tête d'impression à jet d'encre

Country Status (2)

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EP (1) EP0921009A1 (fr)
DE (1) DE19755873C2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000068020A1 (fr) * 1999-05-05 2000-11-16 Cambridge Consultants Limited Systeme d'impression a jet d'encre
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
DE202017106430U1 (de) 2017-10-24 2018-10-25 Francotyp-Postalia Gmbh Gutverarbeitungsgerät

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10227114B3 (de) * 2002-06-18 2004-03-11 Nexpress Solutions Llc Verfahren und Einrichtung zum Anbringen eines Schreibkopfs

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0257570A2 (fr) * 1986-08-25 1988-03-02 Siemens Aktiengesellschaft Méthode d'alignement des injecteurs d'une tête d'impression à jet d'encre dans un dispositif d'enregistrement à encre et circuit électronique adapté à la mise en oeuvre de cette méthode
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

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5049898A (en) * 1989-03-20 1991-09-17 Hewlett-Packard Company Printhead having memory element
DE69110692T2 (de) * 1990-02-02 1995-11-16 Canon Kk Tintenstrahlaufzeichnungsapparat und Tintenstrahlaufzeichnungskopf.
US5241325A (en) * 1991-10-31 1993-08-31 Hewlett-Packard Company Print cartridge cam actuator linkage
EP0674993A3 (fr) * 1994-03-31 1997-06-25 Hewlett Packard Co Système, circuit de contrÔle et méthode pour la correction électronique du désalignement des éléments d'écriture dans les imprimantes par jet d'encre.
JPH08118727A (ja) * 1994-10-28 1996-05-14 Canon Inc 記録ヘッド補正方法及びその装置及びその装置によって補正された記録ヘッド及びその記録ヘッドを用いた記録装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0257570A2 (fr) * 1986-08-25 1988-03-02 Siemens Aktiengesellschaft Méthode d'alignement des injecteurs d'une tête d'impression à jet d'encre dans un dispositif d'enregistrement à encre et circuit électronique adapté à la mise en oeuvre de cette méthode
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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000068020A1 (fr) * 1999-05-05 2000-11-16 Cambridge Consultants Limited Systeme d'impression a jet d'encre
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
DE202017106430U1 (de) 2017-10-24 2018-10-25 Francotyp-Postalia Gmbh Gutverarbeitungsgerät

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Publication number Publication date
DE19755873A1 (de) 1999-06-10
DE19755873C2 (de) 1999-10-14

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