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 PDFInfo
- 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
Links
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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)
- Filtration Of Liquid (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Description
- la figure 1 représente, de manière schématique, un filtre de sécurité pour dispositif de modulation pour tête d'impression à jet d'encre, selon l'art connu,
- la figure 2 représente, de manière schématique, un filtre de sécurité pour dispositif de modulation pour tête d'impression à jet d'encre, selon l'invention,
- la figure 3 représente, en vue éclatée, un dispositif de modulation pour tête d'impression à jet d'encre selon l'art antérieur,
- la figure 4 représente le dispositif de modulation de la figure 3 modifié selon la présente invention.
Claims (12)
- Dispositif de modulation pour tête d'impression à jet d'encre comprenant un support (1) supportant un canon (3) équipé d'une buse pour l'émission du jet d'encre, des moyens d'introduction d'encre sous pression, des moyens de stimulation (25) du jet d'encre associés au canon (3), des moyens de filtration de l'encre, le canon définissant un circuit permettant la circulation de l'encre introduite dans l'ensemble jusqu'à la buse, caractérisé en ce que les moyens de filtration (30) sont des moyens de filtration tangentielle, des moyens de purge (22) étant prévus pour évacuer l'encre non filtrée.
- Dispositif de modulation selon la revendication 1, caractérisé en ce que le canon (3) comprend un corps (2) qui est engagé dans le support (1) de manière étanche, l'espace compris entre le corps du canon et le support constituant une chambre, les moyens de filtration (30) séparant la chambre en une partie amont où aboutissent les moyens d'introduction d'encre et d'où partent les moyens de purge, et une partie aval communiquant avec ledit circuit d'encre du canon.
- Dispositif de modulation selon la revendication 2, caractérisé en ce qu'il est de forme générale cylindrique autour d'un axe qui est l'axe du jet d'encre, les moyens de filtration (30), dits entretoise, étant de forme tubulaire.
- Dispositif de modulation selon la revendication 3, caractérisé en ce que le circuit d'encre du canon est constitué par un canal percé dans le corps du canon.
- Dispositif de modulation selon la revendication 4, caractérisé en ce que les moyens de stimulation (25) du jet d'encre comprennent un résonateur introduit dans le canal du canon.
- Dispositif de modulation selon l'une des revendications 4 ou 5, caractérisé en ce que le corps (2) du canon (3) est engagé dans le support de manière étanche grâce à deux joints expansibles (13, 15) sous l'effet d'une pression, montés autour du corps et situés à chaque extrémité de ladite entretoise (30).
- Dispositif de modulation selon la revendication 6, caractérisé en ce que le corps (2) du canon comprend une première gorge externe (6) située à proximité des moyens d'introduction d'encre (21) et une deuxième gorge externe (7) située à proximité des moyens de purge (22), les gorges (6, 7) communiquant avec le canal du corps.
- Dispositif de modulation selon l'une des revendications 6 ou 7, caractérisé en ce qu'il comporte un écrou (31) qui, en se vissant sur le canon, exerce une pression sur les joints expansibles (13, 15) par l'intermédiaire de l'entretoise (30) et d'une butée (5) d'arrêt en translation des joints, l'expansion des joints assurant l'étanchéité et la fixation du canon (3)dans le support (1).
- Dispositif de modulation selon la revendication 8, caractérisé en ce que l'écrou (31) se vissant à l'extrémité du corps du canon, le diamètre externe de l'écrou est choisi de manière à pouvoir s'engager librement dans le support (1) qui comporte un orifice d'accès pour le vissage de l'écrou.
- Dispositif de modulation selon l'une des revendications 8 ou 9, caractérisé en ce que le canon (3), l'entretoise (30), les deux joints expansibles (13, 15) et l'écrou (31) constituent un ensemble monobloc prêt à être monté sur le support (1), cet ensemble étant obtenu par assemblage préalable de ses éléments constitutifs.
- Dispositif de modulation selon la revendication 10, caractérisé en ce que l'ensemble monobloc comprend en outre les moyens de stimulation (25) du jet d'encre rendus solidaires de l'ensemble par des moyens de fixation.
- Dispositif de modulation selon la revendication 1, caractérisé en ce que le canon (3) et les moyens de filtration (30) font partie d'un ensemble monobloc prêt à être monté sur le support (1) et obtenu par assemblage préalable.
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 (fr) |
EP (1) | EP0724960B1 (fr) |
JP (1) | JPH08230211A (fr) |
CN (1) | CN1140135A (fr) |
AU (1) | AU692337B2 (fr) |
CA (1) | CA2167975A1 (fr) |
DE (1) | DE69601003T2 (fr) |
ES (1) | ES2126982T3 (fr) |
FR (1) | FR2729891B1 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005110762A1 (fr) | 2004-04-30 | 2005-11-24 | Dimatix, Inc. | Ensemble de recirculation |
WO2005108095A2 (fr) * | 2004-04-30 | 2005-11-17 | Dimatix, Inc. | Alignement d'un dispositif d'ejection de gouttelettes |
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)
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 |
-
1995
- 1995-01-31 FR FR9501121A patent/FR2729891B1/fr not_active Expired - Fee Related
-
1996
- 1996-01-24 CA CA002167975A patent/CA2167975A1/fr not_active Abandoned
- 1996-01-25 AU AU42187/96A patent/AU692337B2/en not_active Ceased
- 1996-01-29 DE DE69601003T patent/DE69601003T2/de not_active Expired - Fee Related
- 1996-01-29 ES ES96400205T patent/ES2126982T3/es not_active Expired - Lifetime
- 1996-01-29 EP EP96400205A patent/EP0724960B1/fr not_active Expired - Lifetime
- 1996-01-30 CN CN96104385A patent/CN1140135A/zh active Pending
- 1996-01-30 JP JP8014327A patent/JPH08230211A/ja active Pending
- 1996-01-30 US US08/593,864 patent/US5831654A/en not_active Expired - Fee Related
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 (fr) | 1996-08-01 |
DE69601003D1 (de) | 1999-01-07 |
AU4218796A (en) | 1996-08-08 |
DE69601003T2 (de) | 1999-06-24 |
JPH08230211A (ja) | 1996-09-10 |
FR2729891A1 (fr) | 1996-08-02 |
EP0724960A1 (fr) | 1996-08-07 |
CN1140135A (zh) | 1997-01-15 |
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