EP1795352A1 - Procédé et dispositif pour changer la trajectoire de gouttelettes d'encre - Google Patents

Procédé et dispositif pour changer la trajectoire de gouttelettes d'encre Download PDF

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Publication number
EP1795352A1
EP1795352A1 EP06017707A EP06017707A EP1795352A1 EP 1795352 A1 EP1795352 A1 EP 1795352A1 EP 06017707 A EP06017707 A EP 06017707A EP 06017707 A EP06017707 A EP 06017707A EP 1795352 A1 EP1795352 A1 EP 1795352A1
Authority
EP
European Patent Office
Prior art keywords
ink
deflection
ink drops
trajectories
ink droplets
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.)
Withdrawn
Application number
EP06017707A
Other languages
German (de)
English (en)
Inventor
Frank Otte
Klaus Pechtl
Georg Schmidt
Roland Wernsdorfer
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 EP1795352A1 publication Critical patent/EP1795352A1/fr
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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
    • B41J2/12—Ink jet characterised by jet control testing or correcting charge or deflection

Definitions

  • the invention relates to a method for changing the trajectory of ink droplets that are generated and emitted by a particularly continuous printhead, wherein the ink droplets electrostatically charged and deflected after charging by at least one electric field in a first deflecting in a plane from an original trajectory become.
  • the invention further relates to an ink jet printing apparatus for in particular continuously emitting electrostatically charged ink droplets in an original trajectory having a first deflecting device for deflecting the charged ink droplets in a plane from the original trajectory.
  • Continuous inkjet printing devices have been used industrially for many years to label a variety of products. In general, it is technically possible to distinguish between two variants with the same operating principle, namely the single-beam continuously operating one 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 may in this case be e.g. have an opening diameter in the range of 30 ⁇ to 200 ⁇ m.
  • the ink jet exits, for example, initially as a continuous ink jet, which is impractical for a label, since the characters generated in this type of labeling are composed of individual dots or individual ink droplets.
  • a modulation element is attached to the pressure chamber, which generates pressure fluctuations in the exiting ink jet, so that it breaks up into individual identical drops of ink after exiting the nozzle. 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.
  • pulsed printheads that instantaneously generate individual ink drops that are rechargeable or already charged.
  • the ink has a low electrical conductivity.
  • the electrically charged ink droplets enter the electrostatic field of a plate capacitor and, depending on their individual charge, are more or less deflected from their rectilinear motion and fly off the electrostatic field at a certain charge-dependent angle their original trajectory continues.
  • a disadvantage of the first-mentioned embodiment is that the trajectories of the ink drops emerging from the print head broaden fan-like, so that the font height of a character changes with the distance of the surface to be labeled to the print head and the readability is worsened with greater distance.
  • the invention can be operated not only on continuous ink jet printing devices but also on discontinuous ink jet printing devices.
  • the object of the invention is to improve the readability of a label which is to be applied to the surface of a product with a particularly continuous ink jet printing device. Another object of the invention is to maintain a preset font height of the label regardless of the distance of the printhead to the product.
  • This object is achieved by a method of the aforementioned type, in which the ink drops are deflected by at least one electric field of at least one second deflection device in the same plane. Furthermore, the object is achieved by an ink jet printing device of the type mentioned, in which at least one second deflection device is provided, by means of which the ink drops can be deflected in the same plane.
  • the divergence of the trajectories of the flying ink drops can be influenced by means of a first deflection device by means of a subsequent second deflection device according to the invention.
  • the divergence of the trajectories of the ink droplets or based on the trajectory of each ink droplet whose deflection from the original trajectory again changed, i. enlarged and particularly preferably reduced.
  • the ink drops in at least one second deflection device are deflected in a direction that corresponds to the direction of the first deflection in the first deflection device Deflection device is opposite, in particular such that the first deflection is at least partially, preferably fully compensated.
  • the divergence of the ink drops, which are to contribute to a printed image reduced, or preferably even completely eliminated.
  • a parallelization is particularly advantageous, as a result, the trajectories of the ink droplets for all addressable points of impact are substantially parallel, whereby an independent of the working distance (distance between the print object and the print head) font size is achieved.
  • the deflection devices may be formed as electrode arrangements, wherein the electrode arrangements of the first and at least one second deflection device have different electrical polarities.
  • a compensation of the distractions can be achieved.
  • a same polarity can also be provided in order to achieve an even greater deflection, or, in the case of a multiple electrode arrangement within the second deflection device, a mixed polarity can also be present, in order to achieve a simultaneous parallelization if necessary.
  • a deflection device may comprise at least one plate capacitor, wherein the trajectory (s) of the ink drops extend through the field space of the at least one plate capacitor.
  • a deflection device may also comprise a plurality of plate capacitors arranged one after the other in the direction of flight of the ink droplets, wherein the trajectories of the ink droplets extend respectively through the field spaces of the plate capacitors.
  • FIG. 1 shows by way of example a printhead of a conventional single nozzle continuous ink jet printer.
  • the ink 1 is first pumped from a reservoir 2 by means of a pump 3 via leads 4a into the pressure chamber 5, at one end of which a nozzle 6 is introduced.
  • the pressure in the pressure chamber 5 can be modulated so that the emerging from the nozzle 6 ink jet 10 breaks open at a short distance after its exit into individual ink droplets 11.
  • the individual ink droplets 11 are provided with an individual electrical charge via a charging electrode 12.
  • the ink drops 11 now enter an electric field 21, which is formed by means of the electrodes 20a and 20b of the plate capacitor 20, which forms a deflection device according to the invention.
  • the individual ink droplets are deflected into different spatial directions 101, 102 shown by way of example.
  • the total number of possible deflection angles depends only on the control of the charging electrode and is not limited in principle.
  • the individual plates 20a and 20b of the plate capacitor 20 may be inclined relative to each other, as shown in Figure 1. However, it is also possible to use plates arranged parallel to one another without restriction of generality.
  • Ink droplets 11 that have not been charged because they must be discarded from the typeface do not experience any deflection in the electrostatic field 21 of the plate capacitor 20 and strike an opening 9 of a trapping tube 8 for ink return.
  • the ink thus collected is returned to the ink tank 2 via leads 4b, and is returned to the ink circuit.
  • a further plate capacitor 30 follows the above-described conventional structure. This forms a second deflection device in the context of the invention.
  • the object of this plate capacitor 30 is to divert the charged ink drops 11 that fly into the electrostatic field 31 at a certain angle from their trajectory 101, 102 so that the resulting trajectories 103, 104 after exiting the electrostatic field 31 of the plate capacitor 30 substantially parallel to each other.
  • the electrostatic field 31 of the plate capacitor 30 has a reverse polarity to the electrostatic field of the plate capacitor 20 and its field strength is chosen so that the deflection caused by the electric field of the first plate capacitor 20 from the original direction of flight 100 is compensated and thus the charged Ink drops 11 in a direction of flight 103, 104 deflects, which are substantially parallel to the original direction of flight 100. It is also possible to dispose the plates 30a and 30b of the plate capacitor 30 inclined relative to each other without restriction of generality.
  • the plate capacitor 30 may comprise a plurality of independently controllable plate capacitors 30k, 301, 30m, thus optimizing the trajectories of the ink drops by different field strengths within the field spaces of the individual plate capacitors 30k, 301, 30m to reach.
EP06017707A 2005-12-09 2006-08-25 Procédé et dispositif pour changer la trajectoire de gouttelettes d'encre Withdrawn EP1795352A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005059328A DE102005059328A1 (de) 2005-12-09 2005-12-09 Verfahren und Vorrichtung zur Änderung der Flugbahn von Tintentropfen

Publications (1)

Publication Number Publication Date
EP1795352A1 true EP1795352A1 (fr) 2007-06-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP06017707A Withdrawn EP1795352A1 (fr) 2005-12-09 2006-08-25 Procédé et dispositif pour changer la trajectoire de gouttelettes d'encre

Country Status (3)

Country Link
US (1) US7393086B2 (fr)
EP (1) EP1795352A1 (fr)
DE (1) DE102005059328A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007023014A1 (de) * 2007-05-15 2008-11-27 Kba-Metronic Ag Verfahren und System zur Dosierung und zum Aufbringen einer Reagenzflüssigkeit
JP5725800B2 (ja) * 2010-06-24 2015-05-27 キヤノン株式会社 液体吐出ヘッド
DE102011113664A1 (de) * 2011-09-20 2013-03-21 Simaco GmbH Verfahren und Vorrichtung zur Homogenisierung von Tinte für Inkjet-Geräte
JP5946322B2 (ja) * 2012-05-22 2016-07-06 株式会社日立産機システム インクジェット記録装置
JP2017124519A (ja) * 2016-01-13 2017-07-20 新日鐵住金株式会社 インクジェット印刷装置及びインクジェット印刷方法
JP2022120865A (ja) * 2021-02-08 2022-08-19 株式会社日立産機システム インクジェット記録装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4068240A (en) * 1976-12-20 1978-01-10 International Business Machines Corporation Vector magnetic ink jet printer with stabilized jet stream
US4290073A (en) * 1978-09-25 1981-09-15 Ricoh Co., Ltd. Ink-jet recording apparatus
WO1981003149A1 (fr) * 1980-05-01 1981-11-12 Commw Scient Ind Res Org Commande de gouttes dans un procede d'impression a jet
DE3414948A1 (de) * 1983-04-20 1984-10-25 Ricoh Co., Ltd., Tokio/Tokyo Energiequelle fuer einen farbstrahldrucker
US20040026479A1 (en) * 1997-12-12 2004-02-12 Farnworth Warren M. Continuous mode solder jet apparatus

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55133972A (en) * 1979-04-07 1980-10-18 Ricoh Co Ltd Ink jetting recorder
CA1158706A (fr) * 1979-12-07 1983-12-13 Carl H. Hertz Methode et dispositif de controle de la charge electrique de goutelettes, et imprimante au jet d'encre garnie du dispositif
US4636808A (en) * 1985-09-09 1987-01-13 Eastman Kodak Company Continuous ink jet printer
US7380911B2 (en) * 2004-05-10 2008-06-03 Eastman Kodak Company Jet printer with enhanced print drop delivery

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4068240A (en) * 1976-12-20 1978-01-10 International Business Machines Corporation Vector magnetic ink jet printer with stabilized jet stream
US4290073A (en) * 1978-09-25 1981-09-15 Ricoh Co., Ltd. Ink-jet recording apparatus
WO1981003149A1 (fr) * 1980-05-01 1981-11-12 Commw Scient Ind Res Org Commande de gouttes dans un procede d'impression a jet
DE3414948A1 (de) * 1983-04-20 1984-10-25 Ricoh Co., Ltd., Tokio/Tokyo Energiequelle fuer einen farbstrahldrucker
US20040026479A1 (en) * 1997-12-12 2004-02-12 Farnworth Warren M. Continuous mode solder jet apparatus

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Publication number Publication date
US20070081051A1 (en) 2007-04-12
US7393086B2 (en) 2008-07-01
DE102005059328A1 (de) 2007-06-21

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