WO2018199887A1 - Unité de régulation de pression - Google Patents

Unité de régulation de pression Download PDF

Info

Publication number
WO2018199887A1
WO2018199887A1 PCT/US2017/029110 US2017029110W WO2018199887A1 WO 2018199887 A1 WO2018199887 A1 WO 2018199887A1 US 2017029110 W US2017029110 W US 2017029110W WO 2018199887 A1 WO2018199887 A1 WO 2018199887A1
Authority
WO
WIPO (PCT)
Prior art keywords
ink
pressure regulation
regulation unit
printing system
printhead
Prior art date
Application number
PCT/US2017/029110
Other languages
English (en)
Inventor
Tian Cheng Tang
Cherng Linn Teo
Original Assignee
Hewlett-Packard Development Company, L.P.
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 Hewlett-Packard Development Company, L.P. filed Critical Hewlett-Packard Development Company, L.P.
Priority to PCT/US2017/029110 priority Critical patent/WO2018199887A1/fr
Publication of WO2018199887A1 publication Critical patent/WO2018199887A1/fr

Links

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

  • Printing systems include a printhead for printing a print object on a print media and ink cartridges or reservoirs for providing ink to the printhead.
  • the ink reservoir includes at least one outlet connected to the printhead for allowing the ink to flow to the printhead.
  • a predetermined value of backpressure is maintained across printhead nozzles. For maintaining the backpressure, pressure regulation techniques are used in the printing systems.
  • Figure 1 illustrates a pressure regulation unit, according to an example implementation of the present subject matter.
  • Figure 2 illustrates a printing system having a pressure regulation unit, according to an example implementation of the present subject matter.
  • Figure 3 illustrates a printing system having a pressure regulation unit, according to another example implementation of the present subject matter.
  • Figure 4 illustrates a printing system having a pressure regulation unit, according to yet another example implementation of the present subject matter.
  • Printing systems use pressure regulation techniques to maintain a negative pressure across printhead nozzles.
  • One such technique discloses use of a pressure regulation unit along the printhead to provide backpressure to the printhead.
  • the pressure regulation unit may be provided as a part of an ink supply unit which may be installed in the printhead.
  • the ink supply unit may include two chambers, one holding a porous member and another holding ink. The porous member is partially filled with ink and as the ink is drawn away from the porous member into the printhead, the pressure inside the chamber containing the porous member becomes negative and starts drawing air from an ink supply vent hole to replace volume of the ink drawn out.
  • the porous member may initially partially release its ink owing to which ink level in the porous member may decrease. Once a predefined amount of ink of the porous member has been used up, air may make its way to a bubbler point connecting the two chambers. As the air bubbles into the ink chamber, the pressure in the chamber with ink is relieved, and ink is drawn into the chamber with porous member and to the printhead. [0009] In said technique, the porous member may be partially saturated and partially unsaturated. As the porous member has to be partially saturated to facilitate the pressure regulation, a controlled amount of ink is used to soak the porous member. Thus, the pressure regulation unit is prefilled with ink in the factory and made leak proof by sealing fluidic interconnects with a stopper and a vent hole with a sticker label. The overall cost of the ink supply unit and the printing systems' may thus increase.
  • the pressure regulation unit is to be placed between an ink reservoir and a printhead of a printing system for generating dynamic backpressure across the printhead.
  • the pressure regulation unit includes a porous member as a flow restrictor for restricting flow of ink through the pressure regulation unit for generating the backpressure.
  • the porous member is saturated, owing to which the ink flowing through the porous member may face a resistance, thus generating backpressure.
  • the pressure regulation unit with a saturated porous member thereby facilitates backpressure generation at the printhead during operation of the printing system.
  • the pressure regulation unit is to be connected in between the ink reservoir and the printhead.
  • the pressure regulation unit includes a chamber having an input port at a bottom end for receiving ink from the ink reservoir. Further, an output port is provided at a fop end of the chamber of the pressure regulation unit for transferring the ink to the printhead.
  • the porous member is placed in between the input port and the output port such that the ink flows through an entire length of the porous member to reach the output port for transfer to the printhead. As the porous member is in a saturated state during operation of the printing system, the ink flow from input port to the output port is constrained.
  • the present subject matter thus facilitates in providing backpressure across the printhead nozzles during operation of the printing system.
  • Having the saturated porous member as a flow restricfor helps in providing a cost effective and less complex technique for maintaining negative pressure to prevent ink drooling.
  • the pressure regulation unit may be preinstalied in the printing system and shipped dry. Having the pressure regulation unit shipped in a dry state facilitates in reducing certain components previously used for making the pressure regulation units leak proof during shipping.
  • Figure 1 illustrates a pressure regulation unit 100 for a printing system, according to an example implementation of the present subject matter.
  • the pressure regulation unit 100 is provided to generate backpressure at a printhead (not shown in this figure) of the printing system (not shown in this figure).
  • the pressure regulation unit 100 includes a chamber 102 having an input port 104 at a bottom end and an output port 106 at a top end.
  • the input port 104 is provided at the bottom end of the chamber 102 for receiving ink from an ink reservoir (not shown in this figure) of the printing system.
  • the output port 106 is provided at the top end of the chamber 102 of the pressure regulation unit 100 for transferring the ink to the printhead of the printing system.
  • the pressure regulation unit 100 further includes a porous member 108 placed in between the input port 104 and the output port 106.
  • the porous member 108 is placed in the chamber 102 of the pressure regulation unit 100 to allow the ink to flow through an entire length of the porous member 108 to reach the output port 106.
  • the porous member 108 is to be saturated during operation of the printing system to provide resistance to the ink flow from input port 104 to the output port 106.
  • Figure 2 illustrates a printing system 202 having the pressure regulation unit 100, according to an example implementation of the present subject matter.
  • the printing system 202 includes an ink reservoir 204, a printhead 206, and the pressure regulation unit 100,
  • the printhead 206 is to print a print object on a print media, while the ink reservoir 204 is to hold ink for printing.
  • the pressure regulation unit 100 is provided in between the ink reservoir 204 and the printhead 206 for generating dynamic backpressure at the printhead 206.
  • the pressure regulation unit 100 is to receive ink from the ink reservoir 204 and transfer the ink to the printhead 206.
  • the pressure regulation unit 100 includes the chamber 102 having the porous member 108 to generate dynamic backpressure during operation of the printing system 202.
  • the porous member 108 is positioned such that the ink received in the pressure regulation unit 100 from the ink reservoir 204 is to flow through an entire length of the porous member 108 for transfer to the printhead 206.
  • the porous member 108 is to be saturated during operation of the printing system 202 to generate dynamic backpressure by providing resistance to the ink flow from the ink reservoir 204 to the printhead 206.
  • Figure 3 illustrates a printing system having a pressure regulation unit, according to another example implementation of the present subject matter.
  • the printing system 202 includes the ink reservoir 204, the printhead 206, and the pressure regulation unit 100.
  • the ink reservoir 204 is to hold ink to be used by the printhead 206 to print a print object on a print media.
  • the pressure regulation unit 100 is connected to the printhead 206 and the ink reservoir 204 to resist the ink flow from the ink reservoir 204 to the printhead 206 for generating dynamic backpressure at the printhead 206.
  • the pressure regulation unit 100 includes the chamber 102, having the porous member 108 placed in between the input port 104 and the output port 106 of the chamber 102 of the pressure regulation unit 100. Having the porous member 108 placed in between the input port 104 and the output port 106 allows the ink received from the input port 104 to flow through an entire length of the porous member 108 to reach the output port 106.
  • the porous member 108 is to be saturated during operation of the printing system 202 to resist the ink flow to generate back pressure at the printhead 206.
  • Figure 4 illustrates the printing system 202 having the pressure regulation unit 100, according to yet another example implementation of the present subject matter.
  • the printing system 202 includes the ink reservoir 204, the printhead 206, the pressure regulation unit 100, a pump assembly 402, and a service station cap 404.
  • the printhead 206 is provided to print a print object on a print media.
  • the printhead 206 is supplied ink from the ink reservoir 204, holding a predetermined amount of ink.
  • the printhead 206 is further connected to the service station cap 404 and the pump assembly 402.
  • the pump assembly 402 and the service station cap 404 are provided to create suction at the printhead 206 for drawing ink into the printhead 206 from the ink reservoir 204 through the pressure regulation unit 100 during operation of the printing system 202.
  • the pump assembly 402 may include a plurality of pumps connected to different nozzles of the printhead.
  • the pressure regulation unit 100 is connected in between the printhead 206 and the ink reservoir 204. As illustrated, the pressure regulation unit 100 is connected to the ink reservoir 204 and the printhead 206 using a first connection 406-1 and a second connection 406-2, respectively.
  • the first connection 406-1 and the second connection 406-2 are collectively referred to as connections 406.
  • the first connection 406-1 connects the input port 104 of the chamber 102 of the pressure regulation unit 100 to the ink reservoir 204
  • the second connection 406-2 connects the output port 106 of the chamber 102 of the pressure regulation unit 100 to the printhead 206.
  • the pressure regulation unit 100 includes the input port 104 at a bottom end of the chamber 102 for receiving ink from the ink reservoir 204.
  • the input port 104 may be provided on a bottom wall of the chamber 102 of the pressure regulation unit 100, as illustrated in Figure 4. in another example, the input port 104 may be provided on a side wail at the bottom end of the chamber 102 of the pressure regulation unit 100.
  • the output port 106 is provided at a top end of the chamber 102 of the pressure regulation unit 100 for transferring the ink to the printhead 206.
  • the output port 106 may be provided on a top wall of the chamber 102 of the pressure regulation unit 100, as illustrated in Figure 4. In another example, the output port 106 may be provided on a side wall at the top end of the chamber 102 of the pressure regulation unit 100.
  • the pressure regulation unit 100 further includes the porous member 108 placed in the chamber 102, in between the input port 104 and the output port 106, such that the ink flows through an entire length of the porous member 108 to reach the output port 106 before being transferred to the printhead 206 via the second connection 406-2.
  • the porous member 108 has a volume equal to an inner volume of the chamber 102 of the pressure regulation unit 100.
  • the length of the porous member 108 is equal to a distance between the input port 104 and the output port 106.
  • the width of the porous member 108 is equal to an inner width of the chamber 102 of the pressure regulation unit 100.
  • the porous member 108 is in a saturated state during operation of the printing system 202 to restrict the ink flow from the input port 104 to the output port 106. Having the porous member 108 in a saturated state to restrict the ink flow, facilitates backpressure generation at the printhead 208 during operation of the printing system 202.
  • the pressure regulation unit 100 is manufactured and supplied with the porous member 108 in a dry state.
  • the porous member 108 is thus saturated with the ink once the printing system 202 is installed and switched ON for the first time at a user location.
  • the service station cap 404 and the pump assembly 402 may create suction for drawing ink from the ink reservoir 204 into the pressure regulation unit 100 to saturate the porous member 108.
  • the operation of the printing system 202 may be initiated, in one example, the ink delivery system may include the connections 406, the pressure regulation unit 100, and the porous member 108. Having the pressure regulation unit 100 pre- installed in the printing system 202 and shipped in a dry state facilitates in reducing certain components previously used for making the pressure regulation units 100 leak proof during shipping.
  • the printhead 206 may be positioned at a height above a bubbler point of the ink reservoir 204. in comparison to the previous techniques, where backpressure is only generated by raising the printhead relative to ink tank bubbler point height, the printhead 206 may be positioned at a lesser height above the ink reservoir 204 owing to the use of the pressure regulation unit 100 for backpressure generation, thus reducing the space utilization by the position of the printhead 206 and in turn the printing system 202.

Landscapes

  • Ink Jet (AREA)

Abstract

La présente invention concerne des exemples d'unités de régulation de pression pour un système d'impression. Dans un exemple, l'unité de régulation de pression comprend un orifice d'entrée en correspondance d'une extrémité inférieure de l'unité de régulation de pression pour recevoir de l'encre en provenance d'un réservoir d'encre du système d'impression. Un orifice de sortie est prévu en correspondance d'une extrémité supérieure de l'unité de régulation de pression pour transférer l'encre vers une tête d'impression du système d'impression. En outre, un élément poreux est placé entre l'orifice d'entrée et l'orifice de sortie pour permettre à l'encre de s'écouler sur toute la longueur de l'élément poreux afin d'atteindre l'orifice de sortie. L'élément poreux doit être saturé pendant le fonctionnement du système d'impression pour fournir une résistance au flux d'encre à partir de l'orifice d'entrée vers l'orifice de sortie.
PCT/US2017/029110 2017-04-24 2017-04-24 Unité de régulation de pression WO2018199887A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2017/029110 WO2018199887A1 (fr) 2017-04-24 2017-04-24 Unité de régulation de pression

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2017/029110 WO2018199887A1 (fr) 2017-04-24 2017-04-24 Unité de régulation de pression

Publications (1)

Publication Number Publication Date
WO2018199887A1 true WO2018199887A1 (fr) 2018-11-01

Family

ID=58672726

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2017/029110 WO2018199887A1 (fr) 2017-04-24 2017-04-24 Unité de régulation de pression

Country Status (1)

Country Link
WO (1) WO2018199887A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040085416A1 (en) * 2002-10-31 2004-05-06 Kent Blair M. Recirculating inkjet printing system
US20050219281A1 (en) * 2004-03-24 2005-10-06 Takeo Seino Attachment and liquid supplying
US20060023038A1 (en) * 2004-07-30 2006-02-02 Seu Preston D Air-driven delivery assembly
US20080170098A1 (en) * 2007-01-15 2008-07-17 Fujifilm Corporation Liquid ejection apparatus, image forming apparatus, and liquid ejection method
US20090015640A1 (en) * 2007-07-13 2009-01-15 Toshiba Tec Kabushiki Kaisha Inkjet head and inkjet recording apparatus
US20100328396A1 (en) * 2009-06-30 2010-12-30 Yonglin Xie Flow through dispenser including two dimensional array
EP2343190A1 (fr) * 2008-10-07 2011-07-13 Ulvac, Inc. Dispositif de débit
US20140292933A1 (en) * 2013-03-27 2014-10-02 Seiko Epson Corporation Liquid ejecting head module and liquid ejecting apparatus
WO2015061334A1 (fr) * 2013-10-21 2015-04-30 Mark Andy, Inc. Système numérique modulaire fiable de distribution d'encre d'impression

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040085416A1 (en) * 2002-10-31 2004-05-06 Kent Blair M. Recirculating inkjet printing system
US20050219281A1 (en) * 2004-03-24 2005-10-06 Takeo Seino Attachment and liquid supplying
US20060023038A1 (en) * 2004-07-30 2006-02-02 Seu Preston D Air-driven delivery assembly
US20080170098A1 (en) * 2007-01-15 2008-07-17 Fujifilm Corporation Liquid ejection apparatus, image forming apparatus, and liquid ejection method
US20090015640A1 (en) * 2007-07-13 2009-01-15 Toshiba Tec Kabushiki Kaisha Inkjet head and inkjet recording apparatus
EP2343190A1 (fr) * 2008-10-07 2011-07-13 Ulvac, Inc. Dispositif de débit
US20100328396A1 (en) * 2009-06-30 2010-12-30 Yonglin Xie Flow through dispenser including two dimensional array
US20140292933A1 (en) * 2013-03-27 2014-10-02 Seiko Epson Corporation Liquid ejecting head module and liquid ejecting apparatus
WO2015061334A1 (fr) * 2013-10-21 2015-04-30 Mark Andy, Inc. Système numérique modulaire fiable de distribution d'encre d'impression

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