EP2955027A1 - Équipement et procédé de nettoyage de têtes d'impression par injection d'encre - Google Patents

Équipement et procédé de nettoyage de têtes d'impression par injection d'encre Download PDF

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Publication number
EP2955027A1
EP2955027A1 EP13874401.6A EP13874401A EP2955027A1 EP 2955027 A1 EP2955027 A1 EP 2955027A1 EP 13874401 A EP13874401 A EP 13874401A EP 2955027 A1 EP2955027 A1 EP 2955027A1
Authority
EP
European Patent Office
Prior art keywords
printing head
solvent
ink printing
cleaning
ink
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
EP13874401.6A
Other languages
German (de)
English (en)
Other versions
EP2955027B1 (fr
EP2955027A4 (fr
Inventor
Francisco Javier GAYA FUENTES
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.)
Personas y Tecnologia SL
Original Assignee
Personas y Tecnologia SL
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 Personas y Tecnologia SL filed Critical Personas y Tecnologia SL
Priority to PL13874401T priority Critical patent/PL2955027T3/pl
Publication of EP2955027A1 publication Critical patent/EP2955027A1/fr
Publication of EP2955027A4 publication Critical patent/EP2955027A4/fr
Application granted granted Critical
Publication of EP2955027B1 publication Critical patent/EP2955027B1/fr
Active 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
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16517—Cleaning of print head nozzles
    • B41J2/16552—Cleaning of print head nozzles using cleaning fluids
    • 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
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16517—Cleaning of print head nozzles
    • B41J2/1652—Cleaning of print head nozzles by driving a fluid through the nozzles to the outside thereof, e.g. by applying pressure to the inside or vacuum at the outside of the print head

Definitions

  • the present invention as expressed in the heading of this specification, relates to a system and method for cleaning inkjet printing heads used in the industrial decoration of various items.
  • Industrial decoration is applied to ceramics and other products where the surfaces to be decorated are large, and uses inks which, due to their chemical composition, tend to block up the printing heads with relative frequency.
  • the aim of the invention is to achieve optimal cleaning of these printing heads, with a high level of efficiency and a low cost.
  • the common solution consists of disconnecting the ink inlet tube and using a syringe to apply a liquid solvent, usually of the organic sort, which, as it passes through the inside and exits through the spraying area, where several piezoelectric devices are found, carries away the ink or other matter responsible for the blockage.
  • this invention proposes a system and method for cleaning inkjet printing heads, where the temperature of the solvent used in cleaning is controlled, as well as the pressure of the solvent and the pressure of an air fluid that takes part in cleaning in combination with the solvent.
  • the cleaning times are also controlled, depending on the type of head and the type of ink used by the printing head, and also depending on the amount of blockage.
  • the system of the invention is intended for cleaning, with a solvent, various spaces inside the ink printing heads, through which ink normally flows when sprayed; of note is that the path of at least one pressurized fluid that passes through the internal spaces of the heads is taken in two circulation directions, thus cleaning more effectively.
  • the system of the invention further comprises:
  • the system of the invention comprises a discharge tank that connects to the drain valve by means of a conduit.
  • the system of the invention further comprises:
  • the system of the invention further comprises an ultrasound device located within the main tub, to break apart and break loose the particles making up the blockage inside the ink printing head, further comprising a return device that recirculates the solvent back to the ink printing head, and which is attached to the level device.
  • the pressure control valve, pressure/vacuum switch, and vacuum generator which are part of an air pressure/negative pressure circuit, are elements that generate variations in pressure inside the drums in order to push/suck the liquid solvent held in the drums; this generates a difference in pressure between the inlet/outlet of the ink printing head, in accordance with the circulation direction of the liquid solvent inside the ink head.
  • the system of the invention further comprises a fluid-tight seal between the ink printing head and the passage device during cleaning, wherein the fluid-tight seal between the two elements takes the form of a gasket that has a top base, a bottom base, and at least one through slot around which at least one perimeter lip is located, which protrudes above the top base of the gasket.
  • the gasket is supported by the passage device, whereas each perimeter lip of the gasket presses against the bottom face of the ink printing head, wherein the opposing force between the ink printing head and the passage device during cleaning causes each perimeter lip to bend towards the inner space of the through slot.
  • each one of the perimeter lips has an angular profile.
  • the bottom of the smaller mortise is interrupted by a central opening surrounded by a perimeter ridge that sits against the inner face of the through slot of the smaller gasket.
  • the bottom of the larger mortise is interrupted by several central openings surrounded by perimeter ridges that sit against the respective inner faces of the through slots of the larger gasket.
  • each through slot is surrounded by a single perimeter lip, wherein one of its flanks is a prolongation of the inner face of this through slot, whereas its other flank has a converging inclination over the top face of the gasket.
  • each through slot is surrounded by several perimeter lips, wherein one of its flanks is perpendicular to the top base of the gasket, whereas its other flank has a converging inclination over the top face of the gasket.
  • one of the perimeter lips has a flank that is a prolongation of the inner face of the through slot.
  • the system for cleaning inkjet printing heads comprises a supporting structure 21 that holds a main tub 25, which is filled with a liquid solvent up to a height that is sufficient to cover a lower spraying portion of an ink printing head 16 to be cleaned, which is housed within the main tub 25; in said lower spraying portion there are several piezoelectric devices that are in charge of regulating and applying ink spraying, and which are not represented in the figures.
  • a level control device 17 located inside the main tub 25, such that the excess liquid solvent in the main tub is emptied by the level control device 17 into a level tank 13 to keep the ink printing head 16 from getting wet, and to keep this solvent from mixing with a pressurized recirculated solvent that passes through the inside of the ink printing head 16 in two circulation directions for better and more effective cleaning.
  • Said control device 17 basically comprises a level-controlling tube.
  • the level device 13 is associated with a drain valve 14 that deviates part of the solvent of the level tank 13 into a discharge tank 24.
  • Two solvent taps reach the ink printing head 16, a first tap through a first inlet/outlet passage 19a, and a second tap through a second inlet/outlet passage 19b.
  • the first passage 19a connects to the ink inlet of the ink printing head 16, while the second passage connects to a passage device 18, into the which the ink printing head 16 fits such that it matches up with the outlet holes of the lower inking area, such that the solvent circulates through the inside of the ink printing head 16, in a first circulation direction from its outlet holes to the inlet of the ink printing head 16, first passing through the passage device 18 before flowing into the first passage 19a, and in a second circulation direction from the inlet to the outlet holes of the ink printing head 16, passing through the passage device 18 before flowing into the second passage 19b.
  • the two inlet/outlet passages, first 19a and second 19b, are associated with a direction switch 19, for selecting the circulation direction of the solvent.
  • the system of the invention also includes a main drum 4 that contains clean solvent, and which supplies two working drums, a first one 7 and a second one 8, as needed.
  • the connection between the main tank 4 and the two drums 7 and 8, provides an enormous reduction in the consumption of the solvent that is commonly used for cleaning the ink printing head 16, as the solvent is recirculated through a circuit with various ducts and elements that are described further on.
  • the level tank 13 is also associated with the first 7 and second 8 working drums by means of ducts that connect to said drums 7-8, with an interposed return valve 9.
  • the air pressure control valve 3 is associated with a compressed air regulating filter 2, which in turn connects to a compressed air intake 1.
  • the circuit of the system of the invention also has a conduit that goes from the main drum 4 to the first working drum 7; in this conduit are interpolated a second new solvent filter 10 and new solvent filling valve 12, through which this new solvent passes into the first work drum 7.
  • the system of the invention also has a return device 17a that recirculates the solvent back to the ink printing head 16, and which is attached to the level control device 17.
  • Both the main tub 25 and the rest of the elements and devices are held by a supporting structure 21, which also holds a pneumatic and hydraulic control board 22 as well as an electrical control board 23.
  • an ultrasound device 15 for breaking apart and breaking loose the particles making up the blockage inside the ink printing head.
  • the solvent in the first 7 and second 8 working drums passes through the first working filter 11 by way of the entry/return switch 20 so as to constantly ensure the intended quality.
  • the excess solvent from the main tub 25 can be returned to the first 7 and second 8 working drums, through the level control tank 13 and the return valve 9, and may also optionally be returned to the discharge tank 24 through the level tank 13 and the drain valve 14.
  • the liquid solvent may be sprayed into the ink printing head 16, with a selection of the fluid circulation direction for cleaning the ink printing head 16.
  • the first 11 and second 10 filters are meant to retain the particles that break loose from the stoppage, and thus recycle the liquid cleaning solvent in order to avoid consuming in excess. Filtering is done down to less than 1 micron.
  • a first option in which is let the solvent to circulate through the ink printing head 16 and to return, by force of the pressure itself, to the working drum that does not have air pressure.
  • the ultrasound device 15 has the function of breaking apart and detaching the particles that make up the blockage inside the ink printing head 15.
  • the ultrasound device 15 is activated for short cycles to keep the temperature from rising past 45 degrees. These cycles are carried out intermittently throughout the cleaning time. This keeps the solvent from becoming too hot.
  • the return device 17a is a connection to the level control tube 17 that is used to connect the recirculation outlet of some ink printing heads 16.
  • ink printing heads 16 use recirculation, in which case the recirculation outlet is connected to the level control device 17 which in turn sends all of this excess solvent to the tank 13.
  • the pressurized air fluid is used to generate pressure inside the drums and push the solvent. In this way we avoid using impeller pumps, which require a great deal of maintenance. Thus, in the invention at hand we move the liquid solvent via air pressure.
  • the liquid solvent is carried from the main drum 4 to the first 7 and second 8 working drums by applying air pressure through the pressure control valve 3 and sending this volume of liquid solvent into the first 7 and second 8 working drums, through the second new solvent filter 10.
  • a first pipe 26 connects the first passage 19a to an inlet of the ink printing head 16; while a second pipe 27 connects the second passage 19b to the passage device 18, which the ink printing head 16 fits into.
  • a special, totally fluid-tight seal between the ink printing head 16 and the passage device 18 during the cleaning process which comprises a parallelepiped-shaped gasket 28-28' that has a top base 29, a bottom base 30, and at least one through slot 31 running between both bases 29-30.
  • a smaller gasket 28 that has at least one perimeter lip 32 on its top base 29 around the through slot 31, which makes contact against a bottom face 16a of the ink printing head 16, such that the ink outlet holes open onto this bottom face 16a in an area delimited by the perimeter lip 32.
  • the perimeter lip 32 bends inward as shown in figure 6 , such that the pressure of the cleaning fluid itself pushes said perimeter lip 32 outwards against the bottom face 16a of the ink printing head 16, generating a hermetic seal that increases proportionally as the level of the pressure of the circulating fluid rises.
  • the perimeter lip 32 which has an angular profile, has one vertical flank, as a continuation of an inner lateral face of the through slot 31 of the gasket 28-28', while the other flank of this angular profile has a converging upward inclination.
  • the gasket 28-28' incorporates two perimeter lips 32: an inner one corresponding to the one that has already been described, and a second perimeter lip that is identical and adjacent to the first.
  • the smaller gasket 28 sits into a smaller mortise 33 in the passage device 18.
  • the bottom of this smaller mortise 33 is interrupted by a central opening 34 surrounded by a perimeter ridge 35 that sits against the inner face of the through slot 31.
  • figures 5 and 6 show a larger gasket 28' that has several through slots 31 enabling it to be applied to a multiple ink printing head 16.
  • the larger gasket 28' has a perimeter lip 32 around each through slot 31, as shown more clearly in figure 5 , although it may clearly incorporate various perimeter lips 32 around each through slot 31.
  • the larger gasket 28' also sits into a larger mortise 33' in the passage device 18, such that the bottom of this larger mortise 33' is affected by several central openings 34 surrounded by respective perimeter ridges 35 that sit against the inner faces of the through slots 31.

Landscapes

  • Ink Jet (AREA)
EP13874401.6A 2013-02-08 2013-10-29 Équipement et procédé de nettoyage de têtes d'impression par injection d'encre Active EP2955027B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL13874401T PL2955027T3 (pl) 2013-02-08 2013-10-29 Urządzenie i sposób do czyszczenia atramentowych głowic drukujących

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES201330156A ES2492090B1 (es) 2013-02-08 2013-02-08 Equipo y metodo para limpieza de cabezales de impresion de inyeccion de tinta
PCT/ES2013/070751 WO2014122336A1 (fr) 2013-02-08 2013-10-29 Équipement et procédé de nettoyage de têtes d'impression par injection d'encre

Publications (3)

Publication Number Publication Date
EP2955027A1 true EP2955027A1 (fr) 2015-12-16
EP2955027A4 EP2955027A4 (fr) 2016-12-14
EP2955027B1 EP2955027B1 (fr) 2018-11-21

Family

ID=51299253

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13874401.6A Active EP2955027B1 (fr) 2013-02-08 2013-10-29 Équipement et procédé de nettoyage de têtes d'impression par injection d'encre

Country Status (8)

Country Link
EP (1) EP2955027B1 (fr)
CN (1) CN104321198B (fr)
BR (1) BR112015019025B1 (fr)
ES (2) ES2492090B1 (fr)
IN (1) IN2014KN00873A (fr)
PL (1) PL2955027T3 (fr)
TR (1) TR201901126T4 (fr)
WO (1) WO2014122336A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021106328A1 (de) 2021-03-16 2022-09-22 Heidelberger Druckmaschinen Aktiengesellschaft Verfahren zum Reinigen eines Druckkopfes für den Tintendruck

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6817720B2 (ja) * 2016-05-20 2021-01-20 株式会社写真化学 錠剤印刷装置
CN108724958B (zh) * 2018-08-21 2024-05-07 郑州鑫宇飞数码科技有限公司 喷墨打印墨水在线分散、脱气及过滤装置
ES2748896B2 (es) * 2018-09-18 2021-06-08 Personas Y Tecnologia S L Cierre estanco para dispositivo de limpieza de cabezales de impresion
FR3094899B1 (fr) * 2019-04-15 2022-10-07 Exel Ind Installation d’application de produit de revêtement et procédé de nettoyage d’une telle installation

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4849769A (en) * 1987-06-02 1989-07-18 Burlington Industries, Inc. System for ultrasonic cleaning of ink jet orifices
US6286929B1 (en) * 1998-12-29 2001-09-11 Eastman Kodak Company Self-cleaning ink jet printer with oscillating septum and ultrasonics and method of assembling the printer
US6183058B1 (en) * 1999-09-28 2001-02-06 Eastman Kodak Company Self-cleaning ink jet printer system with reverse fluid flow and method of assembling the printer system
KR100426087B1 (ko) * 2001-10-12 2004-04-06 삼성전자주식회사 프린트헤드 크리닝장치 및 이를 채용한 잉크젯 프린터
JP4503941B2 (ja) * 2003-06-02 2010-07-14 東芝テック株式会社 インクジェットヘッド洗浄装置及びインクジェットヘッド洗浄方法
CN1771133A (zh) * 2004-01-14 2006-05-10 精工爱普生株式会社 液体喷射装置
JP2007090584A (ja) * 2005-09-28 2007-04-12 Mutoh Ind Ltd インクジェットヘッド洗浄装置
KR20080104509A (ko) * 2007-05-28 2008-12-03 삼성전자주식회사 잉크젯 헤드 클리닝장치와 이를 구비하는 잉크젯화상형성장치
JP5053183B2 (ja) * 2008-06-11 2012-10-17 シャープ株式会社 液体吐出用ヘッド洗浄装置及び該洗浄装置を備えた液体吐出装置
CN201240104Y (zh) * 2008-07-29 2009-05-20 文明华 喷头清洗装置
JP4735698B2 (ja) * 2008-09-30 2011-07-27 ブラザー工業株式会社 ヘッドキャップ、液滴吐出ヘッドの回復機構、及び、液滴吐出プリンタ

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021106328A1 (de) 2021-03-16 2022-09-22 Heidelberger Druckmaschinen Aktiengesellschaft Verfahren zum Reinigen eines Druckkopfes für den Tintendruck
DE102021106328B4 (de) 2021-03-16 2024-01-18 Heidelberger Druckmaschinen Aktiengesellschaft Verfahren zum Reinigen eines Druckkopfes für den Tintendruck

Also Published As

Publication number Publication date
BR112015019025B1 (pt) 2021-04-06
CN104321198B (zh) 2016-08-31
EP2955027B1 (fr) 2018-11-21
WO2014122336A1 (fr) 2014-08-14
EP2955027A4 (fr) 2016-12-14
IN2014KN00873A (fr) 2015-10-02
TR201901126T4 (tr) 2019-02-21
ES2492090A1 (es) 2014-09-08
PL2955027T3 (pl) 2019-07-31
ES2492090B1 (es) 2015-07-07
CN104321198A (zh) 2015-01-28
ES2709055T3 (es) 2019-04-15
BR112015019025A2 (pt) 2017-07-18

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