EP2093065B1 - Tintenzufuhrsystem für Drucker - Google Patents

Tintenzufuhrsystem für Drucker Download PDF

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Publication number
EP2093065B1
EP2093065B1 EP09152388A EP09152388A EP2093065B1 EP 2093065 B1 EP2093065 B1 EP 2093065B1 EP 09152388 A EP09152388 A EP 09152388A EP 09152388 A EP09152388 A EP 09152388A EP 2093065 B1 EP2093065 B1 EP 2093065B1
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EP
European Patent Office
Prior art keywords
reservoir
ink
filter
printing head
pressure
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EP09152388A
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English (en)
French (fr)
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EP2093065A1 (de
Inventor
Vincenzo Palumbo
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Projecta Engineering SRL
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Individual
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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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor

Definitions

  • the invention relates an ink supply system for inkjet or glaze printers destined for decorating ceramic tiles.
  • an inkjet printer exhibits a supply system of the ink which comprises at least a printing head, which is connected to a relative tank of ink, and is provided with a plurality of very small dispensing nozzles through which the ink is made to exit in a controlled way, in order to be applied on the surface to be printed on.
  • the printing head is the terminal of a simple supply conduit, in which the ink runs in a single direction from the tank towards the dispensing nozzles.
  • the most up-to-date printing heads are inserted in a closed circuit in which, when the printing operations are stopped, the ink is made to circulate continually, such as to create a constant flow passing through the printing head without exiting from the dispensing nozzles. During this circulation, the ink is generally filtered each time before crossing the printing head, such as to eliminate the dirt and/or air bubbles which might be present in it.
  • printing heads comprise, apart from the above-mentioned dispensing nozzles, also an inlet conduit and an outlet conduit for the ink.
  • the inlet conduit is connected to an upper storage reservoir, while the outlet conduit is connected to a lower storage reservoir, which is at a lower level than the first. Both tanks are kept at atmospheric pressure.
  • the lower reservoir is in communication with the ink tank, and is connected to the upper reservoir through a recycling pump.
  • the height difference between the two tanks enables the ink to run from the upper reservoir to the lower reservoir, crossing the printing head, while the recycling pump pushes the ink which has accumulated into the lower reservoir, newly towards the upper reservoir.
  • the level difference must also be accurately calibrated such as to create a constant slight depression at the printing nozzles of the printing head, so that the ink cannot accidentally exit due to the vibrations or to small impacts, thus introducing a series of not-irrelevant constructional difficulties.
  • closed-circuit ink supply systems in which the circulation is not due to a height difference between the two tanks, but is obtained with two pressure control devices, which are associated to both the tanks, such as to impose a predetermined difference between them.
  • EP 1 886 815 shows an ink supply system for printers that has two tanks connected by a delivery line in which a print head is inserted, said print head being provided with ink nozzles.
  • the tanks are also mutually connected by a return line in which a recycling pump is inserted.
  • a first tank is open to the atmosphere and a second tank is associated to means for pressure control, which are comprised of a compression spring that pushes on two walls of the first tank in order to maintain in it a pressure value inferior to the atmospheric pressure.
  • US 3 930 258 shows an ink supply system for printers having a return tank and a delivery tank connected by a delivery line in which an ink head is inserted and a return line. Both tanks are substantially at the same height, however the difference of pressure needed to have the ink pass form one tank to the other may be obtained by a valve means and a pump.
  • the aim of the present invention is to resolve the drawbacks of supply systems based on a level difference, with a more rational, simple and relatively inexpensive solution with respect to those at present available.
  • the aim is attained by the characteristics of the invention as reported in the independent claims.
  • the dependent claims delineate preferred and/or particularly advantageous aspects of the invention.
  • an ink supply system comprising two storage reservoirs which are reciprocally connected in a closed circuit by a delivery line, in which a printing head is inserted, which printing head is provided with at least an ink dispensing nozzle, and by a return line, in which a recycling pump is inserted.
  • a first reservoir is open to the atmosphere through a breather mouth, while the second reservoir is associated to pressure control means, which internally maintain a pressure level that is lower than atmospheric pressure.
  • the tanks can thus both be located at the same height, obviating the drawbacks in non-level systems, while the plant layout is much simpler and more economical than those at present available, as only one of the two tanks has to be provided with pressure control means.
  • the pressure control means enable a precise calibration of the pressure difference between the two tanks, effectively preventing undesired ink leaks from the system during recycling.
  • the ink supply system denoted in its entirety by 1, comprises two storage reservoirs, respectively 2 and 3, which are positioned at a same height, and are reciprocally connected in a closed circuit by a delivery line 4 and a return line 5.
  • the reservoir 2 comprises a breather mouth 20 opening directly into the atmosphere, which is checked by a closing solenoid 21, and an inlet conduit 22, through which the ink contained in a tank (not illustrated) is supplied internally of the reservoir 2.
  • the reservoir 2 further comprises a level sensor 23, which detects the height of the level L2 of ink internally of the reservoir 2, and a heater 24, which regulates the temperature of the ink.
  • the reservoir 3 comprises a breather mouth 30 which opens directly into the atmosphere, and which is checked by a closing solenoid 31, a level sensor 33 for detecting the height of the level L3 of the ink internally of the reservoir 3, and a heater 34, for regulating the temperature of the ink.
  • the level sensors 23 and 33 are not further described as they are of known type.
  • the heaters 24 and 34 are preferably realised in a single component, as illustrated in the constructional example of figure 2 .
  • the reservoirs 2 and 3 are mounted side-by-side on a single support base 10, which exhibits a raised longitudinal wall 11 which is interposed contactingly between the reservoirs 2 and 3 and keeps them separate.
  • the support base 10 is realised in a material having a high heat conductivity, and is crossed by a longitudinally-developing electrical resistance 12, which is housed internally of the raised wall 11 and is connected to an electrical supply circuit (not illustrated).
  • the electrical resistance 12 is able to heat both the ink contained in the reservoir 2 and the ink contained in the reservoir 3, performing the function of both heaters 24 and 34 illustrated in figure 1 .
  • the reservoir 3 further comprises pressure control and regulation means, denoted in their entirety by 6, which set internally thereof a predetermined pressure value, lower than atmospheric pressure.
  • control means 6 comprise a venturi tube 60, which is connected with the reservoir 3 via a conduit 61 which opens at the narrow section of the venturi tube 60.
  • the venturi tube 60 is crossed by a continuous air flow, such as to obtain a pressure drop in the narrowed section, and thus to create a depression in the reservoir 3.
  • a known-type printing head 7 is inserted in the delivery line 4, which printing head 7 is positioned at a lower height than the reservoirs 2 and 3.
  • the printing head 7 schematically comprises an inlet 70, an outlet 71 and a plurality of small ink-dispensing nozzles 72, open to the atmosphere.
  • the inlet 70 is connected to the reservoir 2 via a first conduit 40, along which an ink filter 41 is inserted, while the outlet 71 is connected to the reservoir 3 via a second conduit 42 of the delivery line 4.
  • the return line 5 comprises a single conduit 50 in which a recycling pump 52 is inserted, which collects ink from an outlet mouth 35 of the reservoir 3 in order to push it towards an inlet mouth 25 of the reservoir 2.
  • the inlet mouth 25 is located higher than the outlet mouth 35, such as to prevent backflow of the ink.
  • An ink filter 5 is also inserted in the line, which is interposed between the recycling pump 52 and the reservoir 2.
  • the heaters 24 and 34 regulate the temperature of the ink contained in the respective reservoirs 2 and 3, such that the dynamic viscosity of the ink is preferably comprised between 12 and 60 centipoise (cP).
  • the breather mouth 20 of the reservoir 2 is open, such that the pressure internally of the reservoir 2 is always atmospheric, while the breather mouth 30 of the reservoir 3 is kept closed by the solenoid 31.
  • the pressure in the reservoir 3 is regulated to a minimum level, i.e. high depression, such that the pressure difference between the reservoirs 2 and 3 reaches a maximum value, able to overcome the overall impedance of the delivery line 4.
  • the ink On crossing the filter 41, the ink is rid of any particles of dirt and/or air bubbles which might have formed in the reservoir 2.
  • the recycling pump 52 enters into operation, such as to source ink from the reservoir 3, pass it through the filter 51 and newly pour it internally of the reservoir 2, completing the cycle.
  • the ink On crossing the filter 51 the ink is purified of any particles of dirt and/or air bubbles which might have formed in the reservoir 3, or on passing through the recycling pump 52.
  • the pressure in the reservoir 3 is increased, i.e. the depression is reduced, such that the pressure difference between the reservoirs 2 and 3 is brought to a minimum level, not sufficient to overcome the impedance of the delivery line 4.
  • the ink runs only along the first tract 40 of the delivery line 4, flowing from the reservoir 2 towards the printing head 7.
  • the ink passes through the filter 41, in which it is purified, and when it reaches the printing head 7 it exits through the dispensing nozzles 72 which are at atmospheric pressure and is deposited on the surface to be printed.
  • the system supplies fresh ink from the tank to the reservoir 2, through the inlet conduit 22.
  • the solenoid 21 closes the breather mouth 20 of the reservoir 2, such that the ink remains confined inside the closed circuit and cannot exit the dispensing nozzles 72 of the printing head 7.

Landscapes

  • Ink Jet (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Labeling Devices (AREA)

Claims (8)

  1. Ein Tintenzufuhrsystem für Tintenstrahldrucker, einschließlich zweier Vorratsbehälter (2, 3), die miteinander über eine Austragsleitung (4), in die ein Druckkopf (7) mit wenigstens einer Spenderdüse (72) für Tinte eingesetzt ist, und über eine Rückleitung (5) verbunden sind, in die eine Umwälzpumpe (52) eingesetzt ist, dadurch gekennzeichnet, dass ein erster Vorratsbehälter (2) über eine Belüftungsöffnung (20) mit der Umgebungsluft in Verbindung steht und ein zweiter Vorratsbehälter (3) Druckkontrollmitteln (6) zugeordnet ist, die ein Venturirohr (60) beinhalten, das mit dem zweiten Vorratsbehälter (3) über eine Leitung (61) in Verbindung steht, welche in einen verengten Abschnitt des Venturirohres (60) mündet, wobei die Druckkontrollmittel im Inneren ein Druckniveau halten, das unterhalb des Umgebungsdruckes liegt.
  2. Das System nach Patentanspruch 1, dadurch gekennzeichnet, dass der erste Behälter (2) und der zweite Behälter (3) nebeneinander auf einer Einzelträgerbasis 10 aufgebaut sind.
  3. Das System nach Patentanspruch 1, dadurch gekennzeichnet, dass Heizmittel (24, 34) zum Regulieren der Temperatur der Tinte im ersten Behälter (2) und im zweiten Behälter (3) enthalten sind.
  4. Das System nach Patentanspruch 3, dadurch gekennzeichnet, dass die Heizmittel (24, 34) einen Einzelkörper (10) aus einem wärmeleitfähigen Material beinhalten und der Einzelkörper (10) in Berührung mit beiden Behältern (2, 3) steht und von wenigstens einem elektrischen Widerstand (12) gekreuzt wird.
  5. Das System nach Patentanspruch 1, dadurch gekennzeichnet, dass es einen ersten Tintenfilter (41) beinhaltet, welcher entlang der Austragsleitung (4) zwischen dem ersten Behälter (2) und dem Druckkopf (7) eingesetzt ist.
  6. Das System nach Patentanspruch 1, dadurch gekennzeichnet, dass es einen zweiten Tintenfilter (51) beinhaltet, welcher entlang der Rückleitung (5) zwischen der Umwälzpumpe (52) und dem ersten Behälter (2) eingesetzt ist.
  7. Das System nach Patentanspruch 1, dadurch gekennzeichnet, dass der erste Behälter (2) eine Einlassleitung (22) beinhaltet, über die der erste Behälter (2) mit einem Tintentank verbunden ist.
  8. Das System nach Patentanspruch 1, dadurch gekennzeichnet, dass der erste Behälter (2) und der zweite Behälter (3) jeweils mit einem Pegelfühler (23, 33) ausgestattet sind.
EP09152388A 2008-02-19 2009-02-09 Tintenzufuhrsystem für Drucker Active EP2093065B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000022A ITRE20080022A1 (it) 2008-02-19 2008-02-19 Sistema d'alimentazione dell'inchiostro per stampanti

Publications (2)

Publication Number Publication Date
EP2093065A1 EP2093065A1 (de) 2009-08-26
EP2093065B1 true EP2093065B1 (de) 2010-09-22

Family

ID=40291872

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09152388A Active EP2093065B1 (de) 2008-02-19 2009-02-09 Tintenzufuhrsystem für Drucker

Country Status (6)

Country Link
EP (1) EP2093065B1 (de)
AT (1) ATE482086T1 (de)
DE (1) DE602009000203D1 (de)
ES (1) ES2350752T3 (de)
IT (1) ITRE20080022A1 (de)
PT (1) PT2093065E (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2492098A1 (de) 2011-02-28 2012-08-29 Projecta Engineering S.r.l. Druckmaschine für Fliesen und dergleichen
WO2013098667A1 (en) 2011-12-30 2013-07-04 Projecta Engineering S.R.L. Cabinet for storing ink-, enamel- and the like jet printing modules

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20111034A1 (it) * 2011-06-08 2012-12-09 Telecom Italia Spa Dispositivo per la stampa a getto d'inchiostro di una superficie
ITVR20120177A1 (it) 2012-09-04 2014-03-05 Projecta Engineering S R L Macchina e metodo per la decorazione digitale di prodotti con materiali granulari e simili
CN103144438B (zh) * 2013-03-06 2014-12-31 佛山市三水盈捷精密机械有限公司 一种喷墨打印机的供墨系统及其控制方法
US9895897B2 (en) 2013-08-27 2018-02-20 Hewlett-Packard Development Company, L.P. Selectively provide pressure differences between reservoirs to cause printing fluid movement
ES2891785T3 (es) 2015-04-23 2022-01-31 Hewlett Packard Development Co Contenedor de líquido
EP3368323B1 (de) 2015-10-29 2020-03-25 Hewlett-Packard Development Company, L.P. Tintenspeichereinheit mit reservoirs mit variablem volumen
CN106274080B (zh) * 2016-08-09 2018-06-26 佛山市三水盈捷精密机械有限公司 纺织数码印花机
US11141987B2 (en) 2017-03-28 2021-10-12 Hewlett-Packard Development Company, L.P. Fluid delivering in a printer
KR102650047B1 (ko) * 2021-08-24 2024-03-20 세메스 주식회사 기판 처리액 공급 유닛 및 이를 구비하는 기판 처리 장치
CN114454621A (zh) * 2021-12-30 2022-05-10 宁波荣大创想智造科技有限公司 一种喷墨打印机的供墨系统
WO2024204862A1 (ja) * 2023-03-29 2024-10-03 京セラドキュメントソリューションズ株式会社 脱気装置、インクジェット記録装置
WO2024204855A1 (ja) * 2023-03-29 2024-10-03 京セラドキュメントソリューションズ株式会社 脱気装置、インクジェット記録装置および脱気方法
CN121175194A (zh) * 2023-05-24 2025-12-19 京瓷株式会社 液体收容罐、液体循环装置以及具备其的记录装置、液体收容罐组

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
US3930258A (en) 1975-01-13 1975-12-30 Dick Co Ab Ink monitoring and automatic fluid replenishing apparatus for ink jet printer
EP1167044B1 (de) * 2000-06-29 2004-02-04 Agfa-Gevaert Tintenstrahldrucker und dessen Tintenversorgungssystem
JP5160749B2 (ja) 2005-06-01 2013-03-13 キヤノンファインテック株式会社 情報処理装置、プリントシステム、プリント方法、およびプログラム
JP4816261B2 (ja) 2006-06-05 2011-11-16 富士ゼロックス株式会社 液滴吐出装置
US7845784B2 (en) * 2006-12-28 2010-12-07 Kabushiki Kaisha Toshiba Ink supplying mechanism and ink supplying method
US20080158321A1 (en) * 2006-12-28 2008-07-03 Toshiba Tec Kabushiki Kaisha Ink jet recording apparatus, ink supplying mechanism and ink jet recording method
US8141993B2 (en) * 2007-07-05 2012-03-27 Seiko Epson Corporation Fluid ejecting apparatus and method for transporting fluid

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2492098A1 (de) 2011-02-28 2012-08-29 Projecta Engineering S.r.l. Druckmaschine für Fliesen und dergleichen
WO2013098667A1 (en) 2011-12-30 2013-07-04 Projecta Engineering S.R.L. Cabinet for storing ink-, enamel- and the like jet printing modules

Also Published As

Publication number Publication date
EP2093065A1 (de) 2009-08-26
DE602009000203D1 (de) 2010-11-04
ITRE20080022A1 (it) 2009-08-20
ATE482086T1 (de) 2010-10-15
ES2350752T3 (es) 2011-01-26
PT2093065E (pt) 2010-11-11

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