EP0724960B1 - Dispositif de modulation équipé d'un filtre de sécurité pour tête d'impression à jet d'encre - Google Patents

Dispositif de modulation équipé d'un filtre de sécurité pour tête d'impression à jet d'encre Download PDF

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Publication number
EP0724960B1
EP0724960B1 EP96400205A EP96400205A EP0724960B1 EP 0724960 B1 EP0724960 B1 EP 0724960B1 EP 96400205 A EP96400205 A EP 96400205A EP 96400205 A EP96400205 A EP 96400205A EP 0724960 B1 EP0724960 B1 EP 0724960B1
Authority
EP
European Patent Office
Prior art keywords
gun
ink
modulating device
support
ink 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.)
Expired - Lifetime
Application number
EP96400205A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0724960A1 (fr
Inventor
Thierry Colombat
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.)
Markem Imaje SAS
Original Assignee
Imaje SA
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 Imaje SA filed Critical Imaje SA
Publication of EP0724960A1 publication Critical patent/EP0724960A1/fr
Application granted granted Critical
Publication of EP0724960B1 publication Critical patent/EP0724960B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41J2/17563—Ink filters

Definitions

  • the present invention relates to a device modulation fitted with a head safety filter inkjet printing.
  • the various jet printing technologies ink use micro-holes for calibrate the diameter of the jets or drops.
  • the dimensions common are of the order of 20 to 80 ⁇ m in diameter.
  • the nozzles through which these jets or drops should remain free of impurity for maintain good print quality.
  • all inkjet printers, and particular continuous inkjet is equipped with filtration systems that maintain the circuits hydraulic to a level of cleanliness compatible with the level of precision of the components put in place for such technologies.
  • Security filters commonly known as LCF (from the English “Last Chance Filter”), are used in virtually all inkjet printers, at points more or less close to the nozzles.
  • the security filters used on these known art devices are filters ensuring transverse filtration. This filtration process forces the ink mixture to pass through perpendicularly the filter as shown by the Figure 1.
  • the transverse filter 40 is represented in the enclosure 41 arranged in the ink circuit, between a supply duct 42 and an outlet duct 43.
  • the duct 42 connected to the pressure track, directs the mixture constituting the ink towards the transverse filter 40.
  • the duct 43 directs the filtrate obtained towards the ink emission nozzle.
  • the solid phase of this mixture is gradually deposited, which translates after a certain time by the clogging of the filter 40. This clogging problem is also poses with the use of pigment ink. This situation increases the pressure drop in the pipe and leads to the change of the filter or to subject this filter to a regeneration cycle.
  • a modulation device for inkjet print head using the principle of tangential filtration.
  • the application of this principle allows, at the time of opening the bleed path, to keep the inkjet running while letting the fluid flow at high flow parallel to the filtering surface and in particular against the outer wall of the filter. This movement of scanning in the cooling phase washes constantly the filter surface and prevents the deposition of particles.
  • the subject of the invention is therefore a device modulation for inkjet print head comprising a support supporting a barrel equipped with a nozzle for the emission of the inkjet, means for introducing pressurized ink, means for inkjet control associated with the barrel, means ink filtration, the barrel defining a circuit allowing the circulation of the ink introduced overall up to the nozzle, characterized in that the filtration means are means of tangential filtration, means of purging being provided for removing unfiltered ink.
  • the barrel may include a body which is tightly engaged in the support, the space between the barrel body and the support constituting a chamber, the filtration means separating the chamber in an upstream part where lead the means of introducing ink and where the purge means, and a downstream part communicating with said canon ink circuit.
  • the modulation device according to the invention is preferably generally cylindrical around an axis which is the axis of the inkjet, the means of filtration, said spacer, being of tubular shape.
  • the ink circuit of the barrel is then advantageously constituted by a channel pierced in the barrel body.
  • the barrel body can be engaged in the waterproof support thanks to two seals expandable under pressure, mounted around of the body and located at each end of said spacer.
  • the barrel, the spacer, the two seals expandable and an assembly nut, and possibly the ink jet control means can be mounted apart from the support to constitute a set monobloc.
  • Figure 2 shows a filter 50 arranged in the enclosure 51 tangentially to the flow of ink.
  • the mixture constituting the ink is introduced into the enclosure 51 by the conduit 52 connected to the track pressure.
  • Part of this ink mixture is filtered by the tangential filter 50 to constitute the filtrate which is directed, through conduit 53, towards the nozzle ink emission.
  • the retentate is evacuated by the leads 54 to the purge path.
  • the device comprises a support 1 which is intended to be fixed on the mechanical structure of the print head (see Figure 1 of the document FR-A-2 653 063).
  • Body 1 has a part tubular 4 axis coincides with the axis of the inkjet.
  • the body is housed 2 of the barrel 3 which is a part of general shape cylindrical, of axis of revolution coincident with the axis of the tubular part 4.
  • the barrel 3 is drilled through from an axial hole 8.
  • the body 2 constitutes the lower part of the barrel 3.
  • a shoulder 5 constitutes the separation between the body 2 and the upper part of the barrel 3.
  • the body 2 is provided with an upper groove 6 near of the shoulder 5 and of a lower groove 7.
  • the lower end 9 of the body 2 is threaded to receive the nut 10.
  • Radial holes 11, 12 drilled respectively in grooves 6 and 7 provide the communication between the axial hole 8 and the grooves 6 and 7.
  • the shaped joint 13 ring, tubular spacer 14 and seal 15 also in the shape of a ring.
  • the average diameters of seals 13 and 15 correspond to the diameter of the spacer 14. This makes the seal 13, the spacer 14 and the seal 15 constitute a stack.
  • the seal 13 abuts on the shoulder 5 of the barrel and the pressure exerted by the nut 10, during screwing, on the joint 15 affects joint 13 via the spacer 14.
  • the seals 13 and 15 are seals expandable under pressure.
  • the tightening of nut 10 therefore causes the application of seals 13 and 15 on the inner wall of the tubular part 4, thus ensuring at the same time the sealing at the level joints and fixing the barrel 3 to the support 1.
  • the nut 10 does not come in support on the tubular part 4 of the support. His action works only on the joint stack 13 - spacer 14 - seal 15.
  • the spacer 14 is provided with a groove upper 16 and lower groove 17. Holes 18 and 19 are drilled radially and respectively in grooves 16 and 17. During assembly, grooves 16 and 17 of the spacer 14 are located opposite the grooves 6 and 7, respectively, of body 2.
  • the support 4 is provided with a connector 21 for introducing pressurized ink into the part tubular 4 and a connector 22 for purging of this same tubular part.
  • These fittings 21 and 22 open near the gorges respectively 16 and 17 of the spacer 14.
  • Resonator 25 which stimulates the inkjet, is introduced by its end 24 in barrel 3 through the upper hole of the hole 8, through the seal 20.
  • the other end of the resonator is extended by an electric cable 23 to an external control member. Cable 23 passes in the axial hole 27 of the flange 28.
  • the fixing of the resonator in the barrel is done in the following way.
  • the equipped resonator 25 of seal 20 is pressed into hole 8 until the underside of the seal 20 abuts on a shoulder provided in the hole 8.
  • the collar 26 then comes into abutment on the upper face of the seal 20.
  • the flange is slid along the cable 23 and its threaded lower part 29 is screwed into the part upper threaded from hole 8 until pressed the seal 20.
  • the device operates as following.
  • the pressurized ink injected by the connection 21 bathes the outside of the spacer 14 and enters inside through holes 18 to reach the external part of the body 2 of the barrel.
  • Ink passes in the holes 11 of the groove 6, penetrates inside of the barrel by bathing the resonator 25 and goes towards the end 9 of the barrel which is terminated by a washer (not visible in Figure 1) pierced with a axial hole serving as an ink emission nozzle.
  • the purge of the device is done by return of the ink, thanks at the holes 12, in the tubular space between the body 2 and the spacer 14 then, thanks to the holes 19 of the spacer, in the tubular space included between the spacer 14 and the tubular part of the support.
  • the ink is then discharged through the connector 22.
  • the inkjet stimulated by the resonator 25, is therefore done along the axis of the device as well as the arrow drawn under the nut 10 is shown.
  • FIG. 4 illustrating the invention, the same references as in FIG. 3 represent the same items.
  • the device has been shown partially assembled.
  • the spacer in Figure 3a been replaced by a filter spacer 30 used both spacer and safety filter.
  • This filtering spacer ensures transverse filtration of the ink and constitutes a safety filter for the device. This filter is further washed continuously by the incoming ink.
  • Such a solution can be adapted to different assemblies with tubular or flat filter, while accommodating many media: fabrics metallic, synthetic fabrics and membranes.
  • the solution proposed by Figure 4 includes a nut 31 different from that of FIG. 3.
  • the nut which previously included (see Figure 3) a shoulder provided with holes for tightening, is modified so that its outside diameter aligns with that of the spacer and that its operation is carried out from a hexagonal shape.

Landscapes

  • Ink Jet (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Filtration Of Liquid (AREA)
EP96400205A 1995-01-31 1996-01-29 Dispositif de modulation équipé d'un filtre de sécurité pour tête d'impression à jet d'encre Expired - Lifetime EP0724960B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9501121A FR2729891B1 (fr) 1995-01-31 1995-01-31 Dispositif de modulation equipe d'un filtre de securite pour tete d'impression a jet d'encre
FR9501121 1995-01-31

Publications (2)

Publication Number Publication Date
EP0724960A1 EP0724960A1 (fr) 1996-08-07
EP0724960B1 true EP0724960B1 (fr) 1998-11-25

Family

ID=9475700

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96400205A Expired - Lifetime EP0724960B1 (fr) 1995-01-31 1996-01-29 Dispositif de modulation équipé d'un filtre de sécurité pour tête d'impression à jet d'encre

Country Status (9)

Country Link
US (1) US5831654A (es)
EP (1) EP0724960B1 (es)
JP (1) JPH08230211A (es)
CN (1) CN1140135A (es)
AU (1) AU692337B2 (es)
CA (1) CA2167975A1 (es)
DE (1) DE69601003T2 (es)
ES (1) ES2126982T3 (es)
FR (1) FR2729891B1 (es)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101161899B1 (ko) 2004-04-30 2012-07-03 후지필름 디마틱스, 인크. 재순환 조립체
JP2007535433A (ja) * 2004-04-30 2007-12-06 ディマティックス インコーポレイテッド 液滴射出装置の位置決め
US7448741B2 (en) * 2004-04-30 2008-11-11 Fujifilm Dimatix, Inc. Elongated filter assembly
USD652446S1 (en) 2009-07-02 2012-01-17 Fujifilm Dimatix, Inc. Printhead assembly
US8517508B2 (en) * 2009-07-02 2013-08-27 Fujifilm Dimatix, Inc. Positioning jetting assemblies
USD653284S1 (en) 2009-07-02 2012-01-31 Fujifilm Dimatix, Inc. Printhead frame

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4575738A (en) * 1984-07-20 1986-03-11 Tektronix, Inc. Ink jet printing apparatus having an ink pressure transient suppressor system
DE3525810A1 (de) * 1985-07-19 1987-01-22 Philips Patentverwaltung Daempfungs- und filterelement fuer die tintenzufuhr zu einem tintenstrahlschreibkopf
JPS6364750A (ja) * 1986-09-08 1988-03-23 Hitachi Ltd インクジエツトプリンタ−用ヘツド
US4864329A (en) * 1988-09-22 1989-09-05 Xerox Corporation Fluid handling device with filter and fabrication process therefor
FR2653063B1 (fr) * 1989-10-16 1995-10-27 Imaje Tete d'impression a jet d'encre et procede de mise en óoeuvre de cette tete destinee notamment a l'impression de caracteres de grandes dimensions.
US5063393A (en) * 1991-02-26 1991-11-05 Videojet Systems International, Inc. Ink jet nozzle with dual fluid resonances
GB2259276B (en) * 1991-09-06 1995-09-27 Linx Printing Tech Ink jet printer
US5426459A (en) * 1992-12-22 1995-06-20 Hewlett-Packard Company Combined filter/aircheck valve for thermal ink-jet pen

Also Published As

Publication number Publication date
CA2167975A1 (en) 1996-08-01
US5831654A (en) 1998-11-03
FR2729891A1 (fr) 1996-08-02
ES2126982T3 (es) 1999-04-01
FR2729891B1 (fr) 1997-04-11
DE69601003T2 (de) 1999-06-24
EP0724960A1 (fr) 1996-08-07
DE69601003D1 (de) 1999-01-07
AU4218796A (en) 1996-08-08
AU692337B2 (en) 1998-06-04
CN1140135A (zh) 1997-01-15
JPH08230211A (ja) 1996-09-10

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