EP0042049B1 - Construction à disposition des électrodes de déflexion pour imprimante à jet d'encre aspirant - Google Patents

Construction à disposition des électrodes de déflexion pour imprimante à jet d'encre aspirant Download PDF

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Publication number
EP0042049B1
EP0042049B1 EP19810102746 EP81102746A EP0042049B1 EP 0042049 B1 EP0042049 B1 EP 0042049B1 EP 19810102746 EP19810102746 EP 19810102746 EP 81102746 A EP81102746 A EP 81102746A EP 0042049 B1 EP0042049 B1 EP 0042049B1
Authority
EP
European Patent Office
Prior art keywords
tunnel
ink
continuations
arrangement
electrode
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
Application number
EP19810102746
Other languages
German (de)
English (en)
Other versions
EP0042049A1 (fr
Inventor
Frederick Robert Feigel, Jr.
Thomas George Twardeck
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of EP0042049A1 publication Critical patent/EP0042049A1/fr
Application granted granted Critical
Publication of EP0042049B1 publication Critical patent/EP0042049B1/fr
Expired 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
    • B41J2/07—Ink jet characterised by jet control
    • B41J2/075—Ink jet characterised by jet control for many-valued deflection
    • B41J2/08—Ink jet characterised by jet control for many-valued deflection charge-control type
    • B41J2/09—Deflection means

Definitions

  • the present invention relates to an aspirated ink jet printer, and more particularly relates to a deflection electrode arrangement for an aspirated ink jet printer.
  • the means for accomplishing this described herein is based on an aspirator configuration with sidewalls that include electrically conductive and ink absorbing characteristics.
  • the preferred embodiment of the invention includes means defining a tunnel for passage therethrough of air and stream of ink, and first and second longitudinally extending deflection electrodes in spaced apart confronting relation in the tunnel for effecting deflection of charged drops in the ink stream passing therebetween, the improvement comprising; electrically conductive continuations of at least one of the deflection electrodes extending toward the other electrode and along the interior of the tunnel so that during start up and shut down of the ink stream, misdirection from the stream direction of a drop which would tend to impact the sidewall of the tunnel will strike the electrically conductive continuations thereby inhibiting ink drop contamination of the tunnel interior.
  • the printer includes a printhead 11 having an outlet nozzle 12 to which ink is applied under pressure so as to produce a stream of ink from the nozzle 12.
  • a printhead 11 having an outlet nozzle 12 to which ink is applied under pressure so as to produce a stream of ink from the nozzle 12.
  • means within the printhead is means (not shown) to effect a perturbation of the ink at some cyclical rate which perturbates the stream ejected from the nozzle causing the stream to break up into drops which receive a charge from a charge ring or electrode 13.
  • the ink stream then passes between deflection electrodes 21 and 22, in the present instance mounted interiorly of a tunnel 20.
  • the aspirator assembly 10 includes a housing 14 having a cavity 15 therein which cooperates with a core or body portion 16 which carries the tunnel 20 and deflection electrodes 21 and 22. As illustrated, the body portion has an enlarged portion 16a and a reduced portion 16b, the reduced portion forming in conjunction with the cavity 15 a settling chamber 17 for receiving a supply of air through a tube 18 which passes through the housing 14.
  • a blower (not shown) provides a supply of air to the settling chamber 17 to effect air flow entry into the tunnel 20 colinearly with the stream of ink droplets, and at approximately the same velocity.
  • the tunnel 20 including the upper deflection electrode 21 and lower deflection electrode 22 conventionally would have the sidewall or walls thereof 23, 24, composed of a ceramic or other insulative material which upon start up and shut down of the ink stream oft times will become contaminated, especially in the area of the dotted lines designated 25, by stray ink contamination.
  • This kind of contamination results in distortion of the electric field intermediate the deflection electrodes because the ink itself is conductive.
  • electrically conductive continuations 26 and 27, (see Fig. 3) of at least one of the deflection electrodes, in the present instance the deflection electrode 22, extends toward the other or confronting electrode 21 and along the interior of the tunnel 20 so that during start up and shut down of the ink stream, misdirection from the stream direction of a drop which would tend to impact the sidewall of the tunnel, will instead strike the electrically conductive continuations 26 and 27 thereby inhibiting ink drop contamination of the uncovered tunnel interior which otherwise would cause field distortion.
  • the electrically conductive continuations 26 and 27 may be composed of the same material as the deflection electrodes 22, for example of an ink absorbing material such as porous stainless steel.
  • the electrical continuations may be formed of an electrically conductive thin film, such as a paint or deposited upon the side wall as at 26 and 27 and in contact with the porous or ink absorbing deflection electrode 22.
  • the tunnel shape is such that a cross section through any portion of the tunnel 20 (perpendicular to the central axis of the tunnel) results in a substantially constant cross sectional area. This is desireable to maintain uniformity of air velocity.
  • the outlet 20b of the tunnel has a greater vertical extent than does the inlet 20a, the height of the tunnel gradually increasing (inlet to outlet) in longitudinal cross section (see Fig. 1) so as to diverge from the inlet to the outlet.
  • the electrical conductive continuations 26 and 27 are preferably also made diverging from the inlet to the outlet so that the space between the upper or vertical terminal edge 26a, 27a of the electrically conductive continuations and the upper deflection electrode 21 is uniform across the longitudinal section.

Landscapes

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

Claims (6)

1. Ensemble d'électrodes de déflexion (10) d'une imprimante à jet d'encre dans lequel des gouttellettes d'encre chargées électriquement sont déviées par des électrodes de déflexion aux fins de l'impression, comportant des moyens définissant un conduit (20) permettant le passage de l'air et duditjet d'encre, ainsi qu'une première (21) et une seconde (22) électrodes de déflexion disposées dans le sens longitudinal, opposées à distance l'une à l'autre, dans ledit conduit (20) de façon à dévier les gouttellettes chargées électriquement contenues dans ledit jet d'encre injecté entre lesdites électrodes; ledit ensemble est caractérisé en ce qu'il comporte :
des prolongements (26, 27) conducteurs d'électricité d'au moins une desdites électrodes (22) qui s'étendent d'une part vers l'autre dite électrode (21) et, d'autre part, dans l'axe longitudinal de l'intérieur dudit conduit (20), de telle sorte que, lors du début et de l'arrêt de l'injection dudit jet d'encre, toute gouttelette inopportunément déviée vers la paroi dudit conduit, atteint, lesdits prolongements conducteurs d'électricité empêchant ainsi de salir la paroi intérieure dudit conduit.
2. Ensemble selon la revendication 1 où lesdits prolongements conducteurs d'électricité (26, 27) et une desdites électrodes (22) forment une électrode de déflexion qui a une section droite pratiquement en forme de U.
3. Ensemble selon la revendication 2 ou l'électrode (22) en forme de U est l'électrode inférieure.
4. Ensemble selon les revendications 1, 2 ou 3 où lesdits prolongements conducteurs d'électricité (26, 27) sont constitués d'un matériau absorbant l'encre.
5. Ensemble selon l'une quelconque des revendications 1 à 4 où la section droite dudit conduit (20) est la même tout au long de son axe longitudinal tandis que sa section longitudinale varie, et où la section desdits prolongements conducteurs d'électricité (26, 27) varie aussie, sa hauteur augmentant au fur et à mesure dans l'axe longidutinal dudit conduit (20).
6. Ensemble selon la revendication 5 où lesdits prolongements conducteurs d'électricité (26, 27) ont, tout au long de leur axe longitudinal, leur extrémité (26a, 27a) respective située pratiquement à égale distance de l'électrode de déflexion (21) opposée.
EP19810102746 1980-06-16 1981-04-10 Construction à disposition des électrodes de déflexion pour imprimante à jet d'encre aspirant Expired EP0042049B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15955980A 1980-06-16 1980-06-16
US159559 1993-12-01

Publications (2)

Publication Number Publication Date
EP0042049A1 EP0042049A1 (fr) 1981-12-23
EP0042049B1 true EP0042049B1 (fr) 1983-11-09

Family

ID=22573063

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810102746 Expired EP0042049B1 (fr) 1980-06-16 1981-04-10 Construction à disposition des électrodes de déflexion pour imprimante à jet d'encre aspirant

Country Status (4)

Country Link
EP (1) EP0042049B1 (fr)
JP (1) JPS5712664A (fr)
CA (1) CA1189896A (fr)
DE (1) DE3161360D1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58193164A (ja) * 1982-05-07 1983-11-10 Sumitomo Electric Ind Ltd インクジエツト方式プリンタ−用偏向電極
GB2249995B (en) * 1990-11-21 1995-03-01 Linx Printing Tech Electrostatic deflection of charged particles
GB9626709D0 (en) * 1996-12-23 1997-02-12 Domino Printing Sciences Plc Continuous ink jet printer
JP5430433B2 (ja) * 2010-02-12 2014-02-26 キヤノン株式会社 液体吐出装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4097872A (en) * 1976-12-20 1978-06-27 International Business Machines Corporation Axial droplet aspirator
JPS5651461B2 (fr) * 1973-09-21 1981-12-05
JPS5152236A (ja) * 1974-10-31 1976-05-08 Nippon Telegraph & Telephone Inkujetsutopurintaa
JPS5240657U (fr) * 1975-09-16 1977-03-23

Also Published As

Publication number Publication date
DE3161360D1 (en) 1983-12-15
CA1189896A (fr) 1985-07-02
EP0042049A1 (fr) 1981-12-23
JPS5712664A (en) 1982-01-22

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