EP0724960A1 - Modulationsvorrichtung mit einem Sicherheitsfilter für einen Tintenstrahldruckkopf - Google Patents

Modulationsvorrichtung mit einem Sicherheitsfilter für einen Tintenstrahldruckkopf Download PDF

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Publication number
EP0724960A1
EP0724960A1 EP96400205A EP96400205A EP0724960A1 EP 0724960 A1 EP0724960 A1 EP 0724960A1 EP 96400205 A EP96400205 A EP 96400205A EP 96400205 A EP96400205 A EP 96400205A EP 0724960 A1 EP0724960 A1 EP 0724960A1
Authority
EP
European Patent Office
Prior art keywords
barrel
modulation device
ink
support
assembly
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
EP96400205A
Other languages
English (en)
French (fr)
Other versions
EP0724960B1 (de
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/de
Application granted granted Critical
Publication of EP0724960B1 publication Critical patent/EP0724960B1/de
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 modulation device equipped with a security filter for an ink jet print head.
  • the various inkjet printing technologies use micro-orifices to calibrate the diameter of the jets or drops. Common dimensions are in the range of 20 to 80 ⁇ m in diameter.
  • the nozzles through which these jets or drops are emitted must remain free of impurities to maintain good print quality.
  • all inkjet printers, and in particular continuous inkjet are equipped with filtration systems which maintain the hydraulic circuits at a level of cleanliness compatible with the level of precision of the components used. room for such technologies.
  • These filters can be placed at various particular points on the circuit.
  • the suction ducts generally equipped with strainers must have a very low pressure drop, so their design (size, fineness of filtration) practically does not participate in maintaining the level of cleanliness of the circuit.
  • Security filters commonly called LCF (from the English “Last Chance Filter”), are used in practically all inkjet printers, at points more or less close to the nozzles.
  • the safety filters used on these devices of the known art are filters ensuring transverse filtration. This filtration process forces the mixture constituting the ink to pass perpendicularly through the filter as shown in FIG. 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 path, directs the mixture constituting the ink to the transverse filter 40.
  • the duct 43 directs the filtrate obtained to the ink emission nozzle.
  • the solid phase of this mixture is gradually deposited, which results after a certain time in the clogging of the filter 40. This clogging problem also arises with the use of pigment ink. This situation increases the pressure drop in the pipeline and leads to changing the filter or subjecting this filter to a regeneration cycle.
  • a modulation device for an ink jet print head using the principle of tangential filtration.
  • the application of this principle makes it possible, at the time of the opening of the purge channel, to keep the ink jet running while letting the fluid flow at a high flow rate parallel to the filtering surface and in particular against the external wall of the filtered.
  • This sweeping movement in the cooling phase constantly cleans the surface of the filter and prevents the deposition of particles.
  • the subject of the invention is therefore a modulation device for an ink jet print head comprising a support supporting a barrel equipped with a nozzle for the emission of the ink jet, means for introducing ink under pressure, means for controlling the ink jet associated with the barrel, means for filtering the ink, the barrel defining a circuit allowing the circulation of the ink introduced into the assembly up to the nozzle, characterized in that the filtration means are tangential filtration means, purging means being provided for removing the unfiltered ink.
  • the barrel may comprise a body which is engaged in the support in a sealed manner, the space comprised between the barrel body and the support constituting a chamber, the filtration means separating the chamber into an upstream part where the ink introduction means terminate and from which the purging means leave, and a downstream part communicating with said canon ink circuit.
  • the modulation device according to the invention is preferably of generally cylindrical shape around an axis which is the axis of the ink jet, the filtration means, called spacers, being of tubular shape.
  • the ink circuit of the barrel is then advantageously constituted by a channel pierced in the body of the barrel.
  • the barrel body can be engaged in the support in a sealed manner by means of two expandable seals under the effect of pressure, mounted around the body and situated at each end of said spacer.
  • the barrel, the spacer, the two expandable seals and an assembly nut, and optionally the means for controlling the ink jet, can be mounted apart from the support to form a one-piece assembly.
  • FIG. 2 shows a filter 50 placed 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 pressure channel.
  • Part of this ink mixture is filtered by the tangential filter 50 to form the filtrate which is directed, through the conduit 53, to the ink emission nozzle.
  • the retentate is evacuated via line 54 towards the purge path.
  • the device comprises a support 1 which is intended to be fixed to the mechanical structure of the print head (see FIG. 1 of the document FR-A-2 653 063).
  • the body 1 has a tubular part 4 whose axis coincides with the axis of the ink jet.
  • the body 2 of the barrel 3 which is a generally cylindrical part, with an axis of revolution coincident with the axis of the tubular part 4.
  • the barrel 3 is drilled right through 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 the shoulder 5 and with 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 the grooves 6 and 7 provide communication between the axial hole 8 and the grooves 6 and 7.
  • the body 2 Before engaging the body 2 of the barrel in the tubular part 4 of the support 1, the body 2 is threaded successively: the seal 13 in the form of a ring, the tubular spacer 14 and the seal 15 also in the form of a ring.
  • the average diameters of the seals 13 and 15 correspond to the diameter of the spacer 14. This means that 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 seal 15 is reflected on the seal 13 by means of the spacer 14.
  • the seals 13 and 15 are seals which expand under the effect of pressure.
  • the tightening of the nut 10 therefore causes the application of the seals 13 and 15 on the internal wall of the tubular part 4, thus ensuring both the seal at the seals and the fixing of the barrel 3 on the support 1.
  • the nut 10 does not come to bear on the tubular part 4 of the support. Its action is exerted only on the seal 13 - spacer 14 - seal 15 stack.
  • the spacer 14 is provided with a groove upper 16 and a lower groove 17. Holes 18 and 19 are drilled radially and respectively in the grooves 16 and 17. During assembly, the 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 tubular part 4 and with a connector 22 allowing the same tubular part to be purged. These connections 21 and 22 open near the grooves 16 and 17 respectively of the spacer 14.
  • the resonator 25, making it possible to stimulate the ink jet, is introduced by its end 24 into the barrel 3 through the upper orifice 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.
  • the cable 23 passes through the axial hole 27 of the flange 28.
  • the resonator is fixed in the barrel as follows.
  • the resonator 25 fitted with the seal 20 is pressed into the hole 8 until the underside of the seal 20 abuts on a shoulder provided in the hole 8.
  • the flange 26 then abuts 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 tapped upper part of the hole 8 until the seal 20 is pressed.
  • the device operates as follows.
  • the pressurized ink injected through the connector 21 bathes the outside of the spacer 14 and penetrates inside through the holes 18 to reach the external part of the body 2 of the barrel.
  • the ink passes through the holes 11 of the groove 6, penetrates inside 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 FIG. 1) pierced with an axial hole serving as an ink emission nozzle.
  • the device is purged by return of the ink, thanks to 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 ink jet stimulated by the resonator 25 therefore takes place along the axis of the device as shown by the arrow drawn under the nut 10.
  • FIG. 4 illustrating the invention, the same references as in FIG. 3 represent the same elements.
  • the device has been shown partially mounted.
  • the spacer of Figure 3 has been replaced by a filter spacer 30 serving both as a spacer and as a safety filter.
  • This filtering spacer provides transverse filtration of the ink and constitutes a safety filter for the device. This filter is also constantly washed by the ink which arrives.
  • Such a solution can be adapted to different assemblies with tubular or flat filter, while accommodating numerous media: metallic fabrics, synthetic fabrics and membranes.
  • the solution proposed by FIG. 4 comprises a nut 31 different from that of FIG. 3.
  • the nut which previously included (see FIG. 3) a shoulder provided with holes for tightening, is modified so that its outside diameter s 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 Modulationsvorrichtung mit einem Sicherheitsfilter für einen Tintenstrahldruckkopf Expired - Lifetime EP0724960B1 (de)

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 true EP0724960A1 (de) 1996-08-07
EP0724960B1 EP0724960B1 (de) 1998-11-25

Family

ID=9475700

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96400205A Expired - Lifetime EP0724960B1 (de) 1995-01-31 1996-01-29 Modulationsvorrichtung mit einem Sicherheitsfilter für einen Tintenstrahldruckkopf

Country Status (9)

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

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005110762A1 (en) 2004-04-30 2005-11-24 Dimatix, Inc. Recirculation assembly
WO2005108095A2 (en) * 2004-04-30 2005-11-17 Dimatix, Inc. Droplet ejection apparatus
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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
FR2653063A1 (fr) * 1989-10-16 1991-04-19 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
EP0603504A1 (de) * 1992-12-22 1994-06-29 Hewlett-Packard Company Kombiniertes Luftfilter-Prüfventil für einen Wärme-Tintenstrahlschreiber

Family Cites Families (3)

* 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
US4864329A (en) * 1988-09-22 1989-09-05 Xerox Corporation Fluid handling device with filter and fabrication process therefor
GB2259276B (en) * 1991-09-06 1995-09-27 Linx Printing Tech Ink jet printer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
FR2653063A1 (fr) * 1989-10-16 1991-04-19 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.
WO1991005663A1 (fr) * 1989-10-16 1991-05-02 Imaje (S.A.) Tete d'impression a jet d'encre
US5063393A (en) * 1991-02-26 1991-11-05 Videojet Systems International, Inc. Ink jet nozzle with dual fluid resonances
EP0603504A1 (de) * 1992-12-22 1994-06-29 Hewlett-Packard Company Kombiniertes Luftfilter-Prüfventil für einen Wärme-Tintenstrahlschreiber

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 12, no. 289 (M - 728)<3136> 8 August 1988 (1988-08-08) *

Also Published As

Publication number Publication date
US5831654A (en) 1998-11-03
FR2729891B1 (fr) 1997-04-11
AU692337B2 (en) 1998-06-04
ES2126982T3 (es) 1999-04-01
CA2167975A1 (en) 1996-08-01
DE69601003D1 (de) 1999-01-07
AU4218796A (en) 1996-08-08
EP0724960B1 (de) 1998-11-25
DE69601003T2 (de) 1999-06-24
JPH08230211A (ja) 1996-09-10
FR2729891A1 (fr) 1996-08-02
CN1140135A (zh) 1997-01-15

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