EP1832423A2 - Procédé et dispositif pour augmenter le nombre des gouttelettes dans un jet de gouttelettes d'une imprimante à jet d'encre continu - Google Patents

Procédé et dispositif pour augmenter le nombre des gouttelettes dans un jet de gouttelettes d'une imprimante à jet d'encre continu Download PDF

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Publication number
EP1832423A2
EP1832423A2 EP06023788A EP06023788A EP1832423A2 EP 1832423 A2 EP1832423 A2 EP 1832423A2 EP 06023788 A EP06023788 A EP 06023788A EP 06023788 A EP06023788 A EP 06023788A EP 1832423 A2 EP1832423 A2 EP 1832423A2
Authority
EP
European Patent Office
Prior art keywords
ink
ink droplet
jet
separate
droplet jet
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
EP06023788A
Other languages
German (de)
English (en)
Other versions
EP1832423A3 (fr
EP1832423B1 (fr
Inventor
Klaus Pechtl
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.)
KBA Metronic GmbH
Original Assignee
KBA Metronic 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 KBA Metronic GmbH filed Critical KBA Metronic GmbH
Publication of EP1832423A2 publication Critical patent/EP1832423A2/fr
Publication of EP1832423A3 publication Critical patent/EP1832423A3/fr
Application granted granted Critical
Publication of EP1832423B1 publication Critical patent/EP1832423B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • B41J2/07—Ink jet characterised by jet control
    • B41J2/075—Ink jet characterised by jet control for many-valued deflection
    • B41J2/08—Ink jet characterised by jet control for many-valued deflection charge-control type
    • B41J2/085—Charge means, e.g. electrodes
    • 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
    • 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
    • B41J2/07—Ink jet characterised by jet control
    • 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
    • B41J2/07—Ink jet characterised by jet control
    • B41J2/115—Ink jet characterised by jet control synchronising the droplet separation and charging time

Definitions

  • Continuous inkjet printers have been used industrially for many years to label a variety of products.
  • two variants can be distinguished technically here, but based on the same principle, the single-jet continuous ink jet printer and the multi-jet continuous ink jet printer.
  • the common working principle is that an ink to be printed is conveyed from a reservoir via pumps with positive pressure in a pressure chamber in the actual printhead having a nozzle.
  • the nozzle in this case has an opening diameter in the range of 30 ⁇ to 200 ⁇ m. From the nozzle now the ink jet initially emerges as a continuous ink jet, which is impractical for a label, since the characters generated here are constructed in this type of labeling of individual dots or individual ink droplets.
  • a modulating element is mounted on the pressure chamber, which generates pressure fluctuations in the exiting ink jet, so that it breaks up into individual similar droplets of ink after exiting the nozzle.
  • the ink drops Shortly before the tearing off of the ink drops, they are each provided with an individual electrical charge, the height of the charge depending on the desired impact position on the product to be labeled. To ensure this, the ink has a low electrical conductivity.
  • the electrically charged ink drops enter the electrostatic field of a plate capacitor and, depending on their individual charge, are more or less deflected from their rectilinear motion and continue to fly after leaving the electrostatic field at a predetermined charge-dependent angle to their original trajectory ,
  • different impact positions can be selected on a surface to be labeled with individual ink droplets, which takes place only in a deflection direction.
  • the ink drops receive a certain charge or remain uncharged, so that they meet after exiting the electrostatic field of the plate capacitor in a collection tube, from where they are pumped back into the ink tank. This causes the ink to circulate in the system, resulting in the designation of continuous ink jet printers.
  • a dot matrix of 7 x 5 points is used as the basis for a label
  • a matrix of 8 x 6 dots must be addressed in order to obtain an appropriate spacing between the characters.
  • a typical one Operating frequency of an inkjet printer is for example 120 kHz, so that mathematically results in a character frequency of 2500 characters per second.
  • the object of the invention is to provide an apparatus and a method with which it is possible to achieve a significant increase in the printing speed without having to accept a deterioration of the print quality.
  • This object is achieved according to the invention in that, in order to increase the writing speed of a continuously operating inkjet printer, the number of ink drops available for the printing process is increased, in particular multiplied.
  • the ink drops of at least two separately generated ink droplet jets are combined to form an ink droplet jet, in particular such that the combined ink droplet jet completely covers the ink droplets of the respective separate ink droplet jets.
  • the deflection of the ink drops combined to form an ink droplet jet to form a typeface may then be e.g. as is known in the art or generally by means of suitable deflection measures.
  • this can be achieved by charging the ink droplets of the separately generated ink droplet jets in each case with an electrical charge and combining them into a single ink droplet jet by deflection in at least one electrical, in particular electrostatic field.
  • a device for example a print head of a continuously operating inkjet printer, can comprise at least two pressure chambers for generating one separate ink droplet jet with electrically charged ink droplets and one electrode arrangement by means of which the separate ink droplet jets can be combined to form an ink droplet jet.
  • a charging electrode arrangement can be arranged for this purpose in the direction of droplet travel. to charge the ink droplets with an electric charge, especially any ink droplet with the same charge.
  • the ink drops in a separate ink droplet jet can all receive the same charge, and the charge may be the same or different for drops of different jets.
  • unification of the ink droplets into a single ink droplet jet can take place in that the separate ink droplet beams are each arranged at an angle to one another prior to the deflection, e.g. in that the pressure chambers are oriented at an angle to each other such that the undeflected separate ink droplets intersect, e.g. all cut in a common intersection.
  • This makes it particularly easy to deflect the individual ink droplets of each separate ink droplet jet and, in particular, asymptotically approach a common trajectory, thereby forming a unified ink droplet jet.
  • at least one ink droplet jet already has the same trajectory when it is generated, as the combined ink droplet jet is therefore coaxial with it.
  • the ink droplets of the separate ink droplet beams are combined out of phase with one another to form a common ink droplet jet, in particular at the same repetition frequency.
  • the phase shift can be generated by a phase-shifted electronic control of separate ink droplets producing respective ink droplets and / or by spatial displacement of a pressure chamber along the direction of a separate ink droplet jet.
  • the modulation elements of the at least two pressure chambers can preferably be operated with the same frequency, so that directly from the at least two pressure chambers with the pressure chambers emerging ink droplets temporally and spatially out of phase with each other are generated, in particular by adjustability and / or phase shiftability of the excitation frequency of the modulation elements of the at least two pressure chambers.
  • the phase shift of the ink droplets between two separate ink droplet jets can then be selected to be 360 ° / n, where n is the number of separate ink droplet beams.
  • the deflection of the separate ink droplet jets into a combined ink droplet jet can preferably be carried out by means of an electrode arrangement which acts on at least two separate ink droplets by at least one electric field, in particular an electrostatic field and is field-free in the area of the combined ink droplet jets. This avoids influencing the combined ink droplet jet.
  • an electrode arrangement for combining two separate ink droplets can be formed by a first electrode and a second electrode between which a third electrode is arranged, wherein a first separate ink droplet jet runs between first and third and a second ink droplet beam between the second and third electrodes.
  • the first and second electrodes may have the same electric potential, which is different from the third electrode, which is e.g. can be grounded.
  • the construction is preferably selected so that the third electrode is arranged in the direction of droplet drop between the first and second electrodes such that it ends earlier in the direction of flight. This results in the preferred field-free space behind the third electrode, because the first and second electrodes face each other with the same potential.
  • At least one of the separate ink droplet beams pass through without field an electrode arrangement is guided for deflecting at least one other separate ink droplet jet, in particular wherein the field-guided ink droplet jet is generated colinearly or coaxially to the combined ink droplet jet.
  • the field-guided ink droplet jet is generated colinearly or coaxially to the combined ink droplet jet.
  • one of the separate ink droplet jets can be asymptotically approximated to the other or, for example, two separate ink droplet jets can be approximated asymptotically from both sides to a third separate ink droplet jet.
  • the third separate ink droplet beam which extends through the electrode field-free and collinear or is arranged coaxially to the unified ink droplet jet.
  • the shape design of the individual electrodes can be such that the electrode surfaces facing the drops are adapted to the surface of the changing trajectory of the drops.
  • the third electrode arranged between the two outer electrodes is designed to taper in the direction of flight of the drops, in particular non-linearly tapering.
  • the electrode arrangement for combining the separate ink droplet beams is followed by a further electrode arrangement for stabilizing the trajectories of the individual ink droplets of the combined ink droplet jet.
  • a combination of several separate ink droplets does not necessarily have to be done in a single step. It may also be provided that groups of separate ink droplets are combined into one ink droplet jet, which in turn are reunited. This is then done in each case by the aforementioned electrode arrangements, wherein between successive Electrode arrangements for combining, if necessary, can still be arranged electrode arrangements for additional deflection of the drops.
  • Figure 1 shows that according to the invention, in addition to the pressure chamber 1 in the write head of a continuous ink jet printer at least one further substantially equal pressure chamber 2 is provided with the task in the gaps between the ejected ink drops 11, which are ejected from the pressure chamber 1, further drops of ink 12 in order to double the number of available ink drops 13 or multiply depending on the number of pressure chambers used.
  • ink supply lines 1a and 2a is conveyed from an ink container, not shown, ink into the pressure chambers 1 and 2 via pumps, not shown.
  • nozzle opening 1b and 2b At the end of the respective pressure chambers 1 and 2 there is a nozzle opening 1b and 2b, from which the ink emerges from the pressure chamber.
  • the ink pressure inside the pressure chambers 1 and 2 is modulated so that the first continuous ink jet breaks shortly after emerging from the nozzle opening into individual ink droplets 11 and 12. Just before the breakup, the individual will Ink drops 11 and 12 of the respective ink jets 11a and 12a are provided with an electric charge via the charging electrodes 3 and 4, respectively.
  • the modulation means 8 and 9 for generating the individual ink drops 11 and 12 of the respective pressure chambers 1 and 2 are excited by a common oscillator 100 and work in this embodiment via a phase shifter 101 to each other phase-shifted, preferably by 360 ° / n, where n is the number referred to the pressure chambers used.
  • the pressure chambers preferably operate 180 ° out of phase, whereby the ejected droplets 11 of the pressure chamber 1 are offset in time and in space from the ejected droplets 12 of the pressure chamber 2 by half a wavelength of the excitation frequency the respective nozzles 1b and 2b are ejected.
  • each pressure chamber 1 and 2 drops 11 and 12 are as already described in a known manner by means of a front of each of the pressure chambers 1 and 2 located loading device 3 and 4 provided with an electric charge, according to the invention each ejected drops a nozzle chamber 1 or 2 receives the same electrical charge.
  • the charges of the different pressure chambers 1 or 2 may be different or the same as required.
  • the pressure chambers 1 and 2 have a geometric inclination to each other with an angle 2 * alpha, whereby the trajectories 11b and 12b of the ejected ink drops 11 and 12 would first meet in a geometric intersection.
  • the ink drops 11 and 12 arrive on their flight subsequently in an electrode assembly 29, wherein the drops 11 and 12 each pass through an electric field 30a and 31a, which is constructed by means of lying at different electrical potentials electrodes 30, 31 and 32.
  • the electrodes 30 and 31 may be at the same potential, so that the drops 14 directed into the new trajectory 14a in the space 33 between the electrodes 30 and 31 do not experience deflection forces due to potential differences between the electrodes 30 and 31 because in this case the electric field becomes zero.
  • the electrode assembly 29 downstream of a further electrode 35, which is separated for example by an insulating layer 36 or by a distance from the electrode assembly 29 and on to the electrodes 30 and 31 different potential and also has the same polarity as the charges of the ink drops 14, so any existing Deviations of the trajectories of the individual ink drops 14 from the desired trajectory 14 a to correct.
  • the modulation elements 8, 9 and 10 are excited by a common oscillator 100 and operate mutually out of phase via the phase shifters 101 and 102, so that the ink drops 11, 12 and 13 are ejected from the pressure chambers 1, 2 and 5 in time and space ,
  • the arrangement shown in Figure 3 operates so that the electrode 42 has a central bore 44 through which the ink jet 13a enters the electrode assembly 40 and merges within the electrode assembly 40 with the other two ink jets 11 and 12 to the exiting ink jet 14 ,
  • the ink jet 13a By having the ink jet 13a in the bore 44 within the electrode 42, no charged electrostatic forces are applied to the charged ink drops 13 and the ink drops are not deflected from their original trajectory 13b. After the ink drops have emerged from the bore 44 of the electrode 42, the ink droplets 13 reach the region between the electrodes 41 and 43 whose electrical potential is expediently the same. As a result, no force acts on the ink droplets 13 transversely to their direction of flight, so that they maintain their trajectory 13b.
  • the deflection of the adjacent ink droplet jets 11a and 12a takes place in such a way that in the region 45 all sub-beams combine to form a common ink droplet jet 14 and all the ink droplets have the same trajectory 14b.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)
EP06023788A 2006-03-08 2006-11-16 Procédé et dispositif pour augmenter le nombre des gouttelettes dans un jet de gouttelettes d'une imprimante à jet d'encre continu Not-in-force EP1832423B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006011072A DE102006011072B4 (de) 2006-03-08 2006-03-08 Verfahren und Vorrichtung zur Erhöhung der Tintentropfenanzahl in einem Tintentropfenstrahl eines kontinuierlich arbeitenden Tintenstrahldruckers

Publications (3)

Publication Number Publication Date
EP1832423A2 true EP1832423A2 (fr) 2007-09-12
EP1832423A3 EP1832423A3 (fr) 2009-07-22
EP1832423B1 EP1832423B1 (fr) 2010-09-08

Family

ID=38336017

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06023788A Not-in-force EP1832423B1 (fr) 2006-03-08 2006-11-16 Procédé et dispositif pour augmenter le nombre des gouttelettes dans un jet de gouttelettes d'une imprimante à jet d'encre continu

Country Status (3)

Country Link
US (1) US7429100B2 (fr)
EP (1) EP1832423B1 (fr)
DE (2) DE102006011072B4 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109789701A (zh) * 2016-08-04 2019-05-21 彼得·约伊特 按需滴液打印头和打印方法

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8354062B2 (en) * 2007-06-15 2013-01-15 Xerox Corporation Mixing device and mixing method
US7938517B2 (en) * 2009-04-29 2011-05-10 Eastman Kodak Company Jet directionality control using printhead delivery channel
JP6250504B2 (ja) * 2014-09-09 2017-12-20 株式会社日立産機システム インクジェット記録装置及びインクジェット記録方法
ES2709375T3 (es) 2015-02-26 2019-04-16 Piotr Jeute Un cabezal de impresión por goteo bajo demanda y procedimiento de impresión
ES2846125T3 (es) 2016-03-30 2021-07-28 Iamfluidics Holding B V Procedimiento y dispositivo para la producción en aire de gotitas individuales, gotitas compuestas y partículas o fibras (compuestas) con forma controlada
JP2019520231A (ja) 2016-07-29 2019-07-18 ヒューレット−パッカード デベロップメント カンパニー エル．ピー．Ｈｅｗｌｅｔｔ‐Ｐａｃｋａｒｄ Ｄｅｖｅｌｏｐｍｅｎｔ Ｃｏｍｐａｎｙ， Ｌ．Ｐ． 流体噴出装置
US11027540B2 (en) 2017-04-05 2021-06-08 Hitachi Industrial Equipment Systems Co., Ltd. Inkjet recording device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5658874A (en) 1979-10-19 1981-05-22 Ricoh Co Ltd Ink jet recorder
DD221691A1 (de) 1983-12-29 1985-05-02 Robotron Bueromasch Verfahren zum aufzeichnen von informationen mittels tintenstrahl
EP1219431A2 (fr) 2000-12-28 2002-07-03 Eastman Kodak Company Méthode et appareil d'impression à jet d'encre continu à masquage de goutte
EP1398155A1 (fr) 2002-09-10 2004-03-17 Brother Kogyo Kabushiki Kaisha Procédé pour la éjection de gouttelettes très petites
US20050122381A1 (en) 2002-01-28 2005-06-09 Thierry Golombat Converging axis dual-nozzled print head and printer fitted therewith

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
US3298030A (en) * 1965-07-12 1967-01-10 Clevite Corp Electrically operated character printer
DE3501905A1 (de) * 1983-08-01 1985-12-12 Veb Kombinat Robotron, Ddr 8012 Dresden Verfahren zum farbigen aufzeichnen von informationen mittels tintenstrahl
JPS60193659A (ja) * 1984-03-15 1985-10-02 Sharp Corp インクジエツトプリンタ
JP4192732B2 (ja) * 2002-09-10 2008-12-10 ブラザー工業株式会社 極微小液滴噴射装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5658874A (en) 1979-10-19 1981-05-22 Ricoh Co Ltd Ink jet recorder
DD221691A1 (de) 1983-12-29 1985-05-02 Robotron Bueromasch Verfahren zum aufzeichnen von informationen mittels tintenstrahl
EP1219431A2 (fr) 2000-12-28 2002-07-03 Eastman Kodak Company Méthode et appareil d'impression à jet d'encre continu à masquage de goutte
US20050122381A1 (en) 2002-01-28 2005-06-09 Thierry Golombat Converging axis dual-nozzled print head and printer fitted therewith
EP1398155A1 (fr) 2002-09-10 2004-03-17 Brother Kogyo Kabushiki Kaisha Procédé pour la éjection de gouttelettes très petites

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109789701A (zh) * 2016-08-04 2019-05-21 彼得·约伊特 按需滴液打印头和打印方法
EP3493990B1 (fr) * 2016-08-04 2020-12-23 Piotr Jeuté Tête d'impression à jet d'encre contrôlé et procédé d'impression
AU2017306809B2 (en) * 2016-08-04 2025-11-27 Piotr Jeuté A drop on demand printing head and printing method

Also Published As

Publication number Publication date
US20070211098A1 (en) 2007-09-13
DE102006011072A1 (de) 2007-09-13
EP1832423A3 (fr) 2009-07-22
EP1832423B1 (fr) 2010-09-08
US7429100B2 (en) 2008-09-30
DE102006011072B4 (de) 2010-08-26
DE502006007831D1 (de) 2010-10-21

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