WO1989008560A1 - Mecanisme d'imprimante a jet d'encre continu - Google Patents

Mecanisme d'imprimante a jet d'encre continu Download PDF

Info

Publication number
WO1989008560A1
WO1989008560A1 PCT/GB1989/000274 GB8900274W WO8908560A1 WO 1989008560 A1 WO1989008560 A1 WO 1989008560A1 GB 8900274 W GB8900274 W GB 8900274W WO 8908560 A1 WO8908560 A1 WO 8908560A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
nozzle plate
electrode assembly
ink jet
carrier
Prior art date
Application number
PCT/GB1989/000274
Other languages
English (en)
Inventor
Colin Gray
Original Assignee
Elmjet Limited
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 Elmjet Limited filed Critical Elmjet Limited
Priority to AT89903774T priority Critical patent/ATE100762T1/de
Priority to DE68912770T priority patent/DE68912770T2/de
Publication of WO1989008560A1 publication Critical patent/WO1989008560A1/fr
Priority to NO903581A priority patent/NO180036C/no
Priority to DK220590A priority patent/DK171477B1/da

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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
    • 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
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2002/14362—Assembling elements of heads
    • 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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/14—Mounting head into the printer

Definitions

  • At least one charge electrode Downstream of the nozzle(s) of a continuous ink jet printer/ are mounted at least one charge electrode, at least one deflection electrode and a gutter; and there may be other items such as a phase detector and/or position detector. These items, particularly the charge electrode (s) must be very accurately located relatively to the ink stream( ⁇ ) in order to provide consistent and reliable operation.
  • a continuous ink jet printing device comprises a nozzle plate with at least one nozzle from which, in use, a jet of ink drops is ejected, and an electrode assembly with at least a drop-charging electrode, the electrode assembly being located relatively to the nozzle plate, at least in directions perpendicular to the direction of the ink jet(s), by virtue of one of the electrode assembly and nozzle plate being rigid with at least one rigid location member, and by virtue of one or more complementary portion( ⁇ ) rigid with the other of the electrode assembly and nozzle plate engaging directly the location member ( ⁇ ).
  • the nozzle opening(s) may be drilled in the nozzle plate in positions accurately related to the location member(s) or to complementary portion( ⁇ ) which engage(s) the location member( ⁇ ) by supporting the nozzle plate in a jig which provides a facsimile of the location member(s) or which provides parts to hold the location member (s) if the location member ( ⁇ ) i ⁇ /are already rigid with the nozzle plate.
  • the electrode assembly will be assembled, i.e.
  • the charge electrode( ⁇ ) and other part ⁇ will be mounted on a support body of the electrode assembly, using a jig which provides a facsimile of the location member (s) or which provides part ⁇ to hold the location member (s) if the location member( ⁇ ) is/are already rigid with support body.
  • a jig which provides a facsimile of the location member (s) or which provides part ⁇ to hold the location member (s) if the location member( ⁇ ) is/are already rigid with support body.
  • the location member(s) is/are conveniently one or more rails extending ⁇ ub ⁇ tantially parallel to the direction of the ink jet( ⁇ ).
  • the or each rail i ⁇ a cylindrical metal dowel.
  • Thi ⁇ may be fixed in a hole in the nozzle plate.
  • one of the nozzle plate and electrode a ⁇ sembly may have one or more location member-engaging portions in the form of an opening through which the or a respective location member slides, or some mean ⁇ of abutment with the location member ( ⁇ ) which gurantees its position laterally of the ink jet( ⁇ ), and its attitude, relative to the location member(s) and hence to the other of the nozzle plate and electrode assembly.
  • a complementary abutment portion may in the form of a groove of V-shaped cross-section receiving and being urged against a longitudinal edge of the rails.
  • Another abutment portion which may be a flat surface, may be urged against the other rail. This provides very simply positive location of the part relatively to the rail in all directions transversely to the rail, and against twisting about axes both longitudinally and tran ⁇ ver ⁇ ely of the rail, i.e. location in all degree ⁇ of freedom except tran ⁇ lational movement along the rail parallel to the ink jet( ⁇ ).
  • thi ⁇ can al ⁇ o be provided by abutment of the complementary portions of the nozzle plate or electrode assembly with the location member (s) for example by providing a three point contact, at least two each consisting, for example, of a projection urged into nesting engagement with a recess.
  • the carrier may be provided by pivoted arms, which are arranged one on each side of the electrode a ⁇ embly, and provide rotational lo ⁇ t motion coupling ⁇ , ⁇ uch as pins and slot ⁇ , or ⁇ liding ball joint ⁇ , with respective ends of a body of the eletrode as ⁇ embly.
  • the carrier may be reciprocatable on a slide, but i ⁇ preferably pivotally mounted so that it can ⁇ wing about an axi ⁇ which may be parallel or perpendicular to the jet direction.
  • a deflection electrode i ⁇ frequently comb-shaped, one jet pa ⁇ ing between each adjacent pair of comb teeth.
  • lead-in ⁇ urface ⁇ may be provided on one of the electrode a ⁇ embly and nozzle plate to engage the other to centralize the comb relatively to the ink jets as they approach one another.
  • the electrode a ⁇ embly may be in the form of two ⁇ eparate ⁇ ub-a ⁇ emblie ⁇ having respective carriers which are retractable on opposite side ⁇ of the ink jet( ⁇ ) and of the location member ( ⁇ ) .
  • Each of the ⁇ ub-a ⁇ emblie ⁇ may then be provided with one of the V groove ⁇ for engagement with a respective rail, but usually only that carrying the charge electrode, particularly when thi ⁇ is comb- ⁇ haped, will need to be provided with the lead-in ⁇ urface ⁇ for lateral centering a ⁇ the sub-assemblies are advanced.
  • Figure 1 is an underneath view of a nozzle plate
  • Figure 2 i ⁇ a ⁇ ide view of the nozzle plate shown in Figure 1;
  • Figure 3 is a plan of one electrode sub-a ⁇ se bly;
  • Figure 4 is a front elevation of the electrode sub-a ⁇ sembly
  • Figure 5 i ⁇ a plan of another electrode sub-assembly
  • Figure 6 is a front elevation of part of a print head
  • Figure 7 is a ⁇ ide elevation of the part of the print head;
  • Figure 8 i ⁇ a front elevation of part of another print head;
  • Figure 9 is a side elevation of the part shown in Figure 8.
  • Figure 10 is a plan showing the juxtaposition of two electrode ⁇ ub-a ⁇ semblies of a print head.
  • Figure 11 i ⁇ a per ⁇ pective view of a print head.
  • the device will be described oriented such that the ink jets are directed vertically downwardly, although the device may be used in a different orientation.
  • a nozzle plate 1 is provided with two accurately positioned and aligned dowel holes 2, 3 set one at each end of a line of nozzle orifices 4. These orifices are formed in the plate accurately positioned relatively to the master dowel hole 2 and to the line between the dowel holes and with their axes aligned relatively to the dowel holes or to the face 5 of the nozzle plate. This can readily be achieved with an appropriately designed jig and forming machine.
  • a multinozzle plate requires accurate pitching and alignment of the orifice ⁇ in any event.
  • Dowel ⁇ 6 and 7 may be in ⁇ erted into the dowel holes 2, 3 prior to forming the orifices 4 and use for location, or may be inserted afterwards in which case the hole ⁇ will have been u ⁇ ed for location.
  • Figure ⁇ 3 and 4 illu ⁇ trate one electrode sub-as ⁇ embly compri ⁇ ing a "live" block onto which charge and deflector electrodes 9 and possibly other items are mounted.
  • the block is provided with complementary parts engaging the nozzle plate dowels 6, 7 and comprising a straight V groove 10 which receives the master dowel 6 and a flat 11 which engages the other dowel 7.
  • the block 8 is mounted in a jig on a facsimile of the nozzle plate dowels and electrodes etc.
  • the electrodes will be accurately positioned relatively to the orifices 4 except in a direction parallel to the dowel ⁇ , i.e. to the ink streams.
  • the sub-assembly will be located against twisting about any of three perpendicular axe ⁇ parallel or perpendicular to the ink jets, and against translational movement in any direction perpendicular to the ink jets.
  • FIG 10 there will normally be two of the sub-a ⁇ emblie ⁇ ⁇ imilar to that ⁇ hown in Figure ⁇ 3 and 4, and these may be termed a "live" block LB fitted with the charge electrode and live deflection electrode and an "earth” block EB fitted with the earthed deflection electrode.
  • the block LB is shown having a V groove 10 providing the essential location with the master dowel 6 and the block EB having a V groove 10A engaging the dowel 7. This i ⁇ the preferred arrangement as it is the live block carrying the charge electrode which requires the more precise location.
  • a charge electrode 12 ha ⁇ a comb-like shape such that each ink jet 13 passes through a respective slot between adjacent teeth of the comb with a very small lateral clearance.
  • Thi ⁇ location may be provided by providing lead-in surfaces at the entrance to a groove 14, the depth of which is such that the lead-in surfaces engage the secondary dowel 7 before the comb engages the jets, and the separation of which limits lateral movement to prevent the jets touching the comb whilst allowing the V groove 10 to take over the lateral location once it engages the master dowels.
  • a groove 14A providing the lead-in surfaces may alternatively be provided at the entrance to the V groove 10. It is acceptable to allow slight lateral movement of the block EB and the groove 10A could be omitted so that both sides of the block EB engage the dowels 6 and 7 in similar fa ⁇ hion.
  • the electrode ⁇ ub-a ⁇ semblies LB and EB may be advanced and retracted relatively to one another and to the dowel ⁇ 6 and 7 by a linear slide mechanism, a pivotal arrangement i ⁇ preferred. Thu ⁇ a ⁇ shown in Figure ⁇ 6 and 7, the "live" block LB i ⁇ mounted on a ⁇ winging carrier 15 formed of bent ⁇ heet metal and pivotally mounted at it ⁇ upper end about a horizontal pin 16.
  • each pin 18 is insignificantly smaller than the width of each slot 19, whereby the block LB is free to rotate and twist relatively to the carrier 15, but the carrier provides location against translational movement of the block in the vertical direction, i.e. parallel to the dowels 6 and 7 and to the ink jets.
  • the carrier 15 may be latched in it ⁇ illustrated operative position by rotating a rod 23 about an axis 24 so that it rides down a cam surface 28 of a cam 26 fixed to the carrier 15, and into a notch 25.
  • the ⁇ ub-a ⁇ embly LB automatically accommodating itself into the predetermined po ⁇ ition relatively to the jet ⁇ irrespective of loosene ⁇ between the block and carrier and of any loosenes ⁇ or tolerance ⁇ in the mounting or con ⁇ truction of the carrier.
  • the ⁇ ub-a ⁇ embly engage ⁇ the dowel ⁇ before the rod 23 i ⁇ fully home in the notch 25, ⁇ o that the final movement of the rod 23 progre ⁇ ively co pre ⁇ e ⁇ the ⁇ pring 17 to provide both the engagement and latching forces.
  • Figure 11 shows a print head in accordance with the invention, although the individual parts, such a ⁇ the electrode assemblies and their carriers are shown to have shape ⁇ different from the diagrammatic representations in the other views.
  • Figure 11 shows wiring 30 for conducting electrical control signals to a vibrator for forming the ink jets and to the electrodes, and ducting 31 for the supply and recirculation of ink.
  • Figure ⁇ 8 and 9 show an alternative method of supporting a sub-assembly LB or EB on a carrier 15.
  • ⁇ lot ⁇ 22 in the ⁇ ub-as ⁇ e bly receive re ⁇ pective part-spherical ends 20 on pins 21 fixed to the carrier 15a.
  • the ⁇ lot ⁇ 22 have dimen ⁇ ion ⁇ greater than the diameter of the sphere in both tran ⁇ verse directions, however, vertical location i ⁇ again provided.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)

Abstract

Un mécanisme d'imprimante à jet d'encre continu comprend une plaque à buse et deux ensembles d'électrodes (EB, LM) qui sont positionnés de part et d'autre par rapport à la plaque à buse ou au moins perpendiculairement à la direction du jet à encre, et montées à l'aide de goujons (6, 7) solidaires avec la plaque à buse.
PCT/GB1989/000274 1988-03-16 1989-03-15 Mecanisme d'imprimante a jet d'encre continu WO1989008560A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT89903774T ATE100762T1 (de) 1988-03-16 1989-03-15 Kontinuierlicher tintenstrahldrucker.
DE68912770T DE68912770T2 (de) 1988-03-16 1989-03-15 Kontinuierlicher tintenstrahldrucker.
NO903581A NO180036C (no) 1988-03-16 1990-08-15 Stråleskriver
DK220590A DK171477B1 (da) 1988-03-16 1990-09-14 Kontinuerlig farvestråleskriveenhed

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888806218A GB8806218D0 (en) 1988-03-16 1988-03-16 Continuous ink-jet printing device
GB8806218 1988-03-16

Publications (1)

Publication Number Publication Date
WO1989008560A1 true WO1989008560A1 (fr) 1989-09-21

Family

ID=10633517

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1989/000274 WO1989008560A1 (fr) 1988-03-16 1989-03-15 Mecanisme d'imprimante a jet d'encre continu

Country Status (5)

Country Link
EP (1) EP0404810B1 (fr)
JP (1) JP2807300B2 (fr)
DK (1) DK171477B1 (fr)
GB (1) GB8806218D0 (fr)
WO (1) WO1989008560A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990008037A1 (fr) * 1989-01-12 1990-07-26 Elmjet Limited Ensemble electrode pour imprimante a jet d'encre continu

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4080607A (en) * 1976-07-12 1978-03-21 The Mead Corporation Jet drop printing head and assembly method therefor
US4234884A (en) * 1979-03-01 1980-11-18 The Mead Corporation Ink jet printer assembly and alignment of printer components
US4277790A (en) * 1979-12-26 1981-07-07 International Business Machines Corporation Field replaceable modules for ink jet head assembly
US4338610A (en) * 1972-11-21 1982-07-06 Burroughs Corporation Modular-head endorser
US4617574A (en) * 1983-03-07 1986-10-14 Imaje S.A. Ink-jet print head assembly

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4338610A (en) * 1972-11-21 1982-07-06 Burroughs Corporation Modular-head endorser
US4080607A (en) * 1976-07-12 1978-03-21 The Mead Corporation Jet drop printing head and assembly method therefor
US4234884A (en) * 1979-03-01 1980-11-18 The Mead Corporation Ink jet printer assembly and alignment of printer components
US4277790A (en) * 1979-12-26 1981-07-07 International Business Machines Corporation Field replaceable modules for ink jet head assembly
US4617574A (en) * 1983-03-07 1986-10-14 Imaje S.A. Ink-jet print head assembly

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990008037A1 (fr) * 1989-01-12 1990-07-26 Elmjet Limited Ensemble electrode pour imprimante a jet d'encre continu

Also Published As

Publication number Publication date
DK171477B1 (da) 1996-11-18
DK220590D0 (da) 1990-09-14
DK220590A (da) 1990-09-14
EP0404810B1 (fr) 1994-01-26
JP2807300B2 (ja) 1998-10-08
JPH03503387A (ja) 1991-08-01
EP0404810A1 (fr) 1991-01-02
GB8806218D0 (en) 1988-04-13

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