EP0017757A1 - Schreibkopf mit Ansaugung für Tintenstrahldrucker - Google Patents

Schreibkopf mit Ansaugung für Tintenstrahldrucker Download PDF

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Publication number
EP0017757A1
EP0017757A1 EP80101299A EP80101299A EP0017757A1 EP 0017757 A1 EP0017757 A1 EP 0017757A1 EP 80101299 A EP80101299 A EP 80101299A EP 80101299 A EP80101299 A EP 80101299A EP 0017757 A1 EP0017757 A1 EP 0017757A1
Authority
EP
European Patent Office
Prior art keywords
walls
pair
cavity
tunnel
print head
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.)
Withdrawn
Application number
EP80101299A
Other languages
English (en)
French (fr)
Inventor
Alvin Leroy Wittwer
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 EP0017757A1 publication Critical patent/EP0017757A1/de
Withdrawn legal-status Critical Current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
    • 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

Definitions

  • the present invention relates to inkjet printers and, more particularly, to a suction device intended for such a printer and comprising a tunnel whose walls can move so as to prevent contamination by the ink which it contains. when the printer is turned on or off.
  • the U.S. Patent No. 4,097,872 describes a suction device for an ink jet printer the main purpose of which is to create in said tunnel a gas stream which moves in parallel following ink droplets and at practically identical speed so as to reduce the aerodynamic effects on neighboring droplets.
  • the section of the tunnel measured in any plane perpendicular to the longitudinal axis is practically constant, which makes it possible to maintain the speed of which the gas stream is animated at a practically constant value. It is known that, when switching on or off an inkjet printer, contamination of the walls of the suction device by ink droplets can occur (which is particularly true in the case cold start-up).
  • the electrodes or deflection plates (which make up the upper and lower walls of the tunnel) are made of sintered metal and can absorb small amounts of ink falling into the suction device during switching on or off, but the tunnel walls, which are made of dielectric material, do not have this ability.
  • the walls of the tunnel of the suction device are made to move away from the deflection electrodes when the printer is turned on (or off), and are then applied to the surfaces of the printer. These electrodes, in order to cause the tunnel to form after the machine has been started up, which makes it possible to prevent the walls from being contaminated by ink when the printer is started up since they are located then away from the electrodes.
  • One of the main objects of the present invention is therefore to provide a suction device for an ink jet printer, the tunnel of which has movable walls.
  • a printhead comprising a suction device which comprises a tunnel whose cross section is practically uniform so that the speed of the air stream flowing through it is equal to that of the ink droplets, which virtually eliminates the aerodynamic disturbances to which they are subject.
  • a print head 10 which in this case is intended for an analog type deflection inkjet printer, comprises a droplet generator 11 and a suction device 20 produced in accordance with the present invention.
  • the droplet generator 11 of such a printer comprises a chamber containing ink to which a disturbance is applied by means, for example, of a piezoelectric crystal, so that the jet of ink emanating from a nozzle 12 is divided into droplets 13 to which a charge is applied, if necessary, by a charging electrode 14.
  • the droplets then pass between upper and lower deflection electrodes 21 and 22 respectively mounted inside of the device 20 and which cause a deflection of the droplets as a function of the load which has been applied to them. If the droplets have not received any charge (and are not used for printing purposes), they are intercepted by a gutter 15 which brings them back to a pump (not shown) and to the generator 11.
  • the suction device 20 comprises a casing 23 of tubular shape and which, in the present example, is cylindrical.
  • This casing is made of dielectric material, for example ceramic or plastic material, for example those sold under the name of Plexiglass or Noryl. It has at one of its ends a wall 24 in which there is, in the present example, a central opening 25 into which can be introduced and fixed means 26 comprising the charging electrode 14.
  • the wall 24 can also be used fixing the casing 23 to the droplet generator 11, using, for example, the method described in U.S. Patent No. 4,097,872, supra, with the understanding that any other method of attachment which is not likely to cause turbulence in the air flowing through the tunnel of the suction or allow air to escape.
  • the housing 23 comprises a cavity 27 of annular shape which is defined by axial projections 28 and 29 which respectively include the electrodes 21 and 22.
  • the walls 28a and 29a, situated at the ends, are curved, as is the part interior 24a of the wall 24, so that the air introduced into the interior of the device through the inlet orifice 30 is not subject to any turbulence.
  • the electrodes 21 and 22 are arranged in the cavity 27, but are separated from each other, so as to constitute at least one pair of surfaces arranged opposite and forming a first pair of walls 21a , 22a of a tunnel 31 inside the cavity 27.
  • each of the deflection electrodes can have any shape, it is preferable that the parts 21b, 22b have the shape of bubbles whose parts of smaller diameter 21c, 22c, merge respectively with the surfaces 21a, 22a (see Figure 2).
  • the deflection electrodes 21 and 22 made of sintered metal can absorb small quantities of ink falling inside the tunnel 31 when the printer is turned on or off
  • the other two tunnel walls which are located on either side of the electrodes 21 and 22 must be made of a dielectric material and are preferably movable so that they can pass into the cavity 27, from a first position, in which they are distant from the surfaces 21a, 22a of the electrodes, at a second position, in which they are in contact with these surfaces and then define the tunnel.
  • the tunnel 31 comprises an inlet opening 32 which, as can be seen in FIG. 2, is rectangular in shape, its longest side being horizontal, and an outlet orifice 33 , which is also rectangular, but the largest side of which is vertical. Therefore, the section of the tunnel at any point thereof is practically equal to its section at any other point.
  • the walls 35 and 36 which are inside the cavity are mobile and, as will be seen below, can move between a first position such as that shown in FIG. 2, in which they are in contact with the surfaces of the deflection electrodes 21 and 22, and more particularly with the edges of the facing surfaces 21a and 22a, so as to define the tunnel 31 by forming the walls thereof, and a another position in which the walls 35 and 36 are distant from the facing surfaces.
  • the walls 35 and 36 preferably consist of a rigid dielectric material, but having a certain elasticity, such as that sold under the name of Delrin or any other plastic material reinforced so as to form the thick parts shown in 36a and 35a.
  • the walls 35 and 36 are supported by bellows-shaped elements 39 and 40 which, when an appropriate vacuum is applied by means, for example, of pipes 41 and 42, separate the walls 35 and 36 from the electrodes 21 and 22 or at least surfaces 2la and 22a so that badly directed droplets cannot strike said walls when the printer is turned on or off. This avoids any contamination of the walls as well as any risk of short-circuit resulting from the presence of ink on them.
  • the printer When the printer is turned on, compressed air is applied to the bellows-shaped elements 39 and 40 via the pipes 41 and 42, and the walls 35 and 36 of the elements 39 and 40 are brought into contact with the surfaces 21b, 22b and 21c, 22c of the deflection electrodes 21 and 22, the shape of which they easily follow , thus defining the tunnel 31.
  • the lateral shape of the deflection electrodes makes it possible to guide the walls 35 and 36 and automatically compensates for any misalignment resulting from the withdrawal of the walls when the air contained in the bellows-shaped elements is expelled 39 and 40.
  • the pipes 41 and 42 must penetrate into the cavity 27 at a point such that they do not create any turbulence of the air introduced into the tunnel 31 through the intake orifice 30.
  • filters or filters screens such as those shown in 17 and 18 can be used to reduce turbulence and create a laminar air flow in tunnel 31 as far as possible.
  • the device of the present invention therefore makes it possible to move the walls of the tunnel through which the ink droplets and the air flow of the suction device pass so as to prevent ink from contaminating said walls during the setting up. on and off of the printer.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)
EP80101299A 1979-04-23 1980-03-13 Schreibkopf mit Ansaugung für Tintenstrahldrucker Withdrawn EP0017757A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/032,424 US4260996A (en) 1979-04-23 1979-04-23 Aspirated ink jet printer head
US32424 1979-04-23

Publications (1)

Publication Number Publication Date
EP0017757A1 true EP0017757A1 (de) 1980-10-29

Family

ID=21864897

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80101299A Withdrawn EP0017757A1 (de) 1979-04-23 1980-03-13 Schreibkopf mit Ansaugung für Tintenstrahldrucker

Country Status (5)

Country Link
US (1) US4260996A (de)
EP (1) EP0017757A1 (de)
JP (1) JPS55142667A (de)
CA (1) CA1137537A (de)
IT (1) IT1149224B (de)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6505922B2 (en) * 2001-02-06 2003-01-14 Eastman Kodak Company Continuous ink jet printhead and method of rotating ink drops
US6565182B1 (en) * 2002-01-31 2003-05-20 Hewlett-Packard Development Company, L.P. Aerodynamic fairing structure for inkjet printing
US7918530B2 (en) * 2006-02-03 2011-04-05 Rr Donnelley Apparatus and method for cleaning an inkjet printhead
US7458677B2 (en) * 2006-06-20 2008-12-02 Eastman Kodak Company Reduction of turbulence within printing region of inkjet printer heads
US20090021542A1 (en) * 2007-06-29 2009-01-22 Kanfoush Dan E System and method for fluid transmission and temperature regulation in an inkjet printing system
US8585179B2 (en) * 2008-03-28 2013-11-19 Eastman Kodak Company Fluid flow in microfluidic devices
US8540351B1 (en) * 2012-03-05 2013-09-24 Milliken & Company Deflection plate for liquid jet printer
US8888208B2 (en) 2012-04-27 2014-11-18 R.R. Donnelley & Sons Company System and method for removing air from an inkjet cartridge and an ink supply line
CN108778753B (zh) 2016-03-04 2020-04-21 R.R.当纳利父子公司 打印头维护台及其操作方法
CN207291314U (zh) 2016-05-09 2018-05-01 R.R.当纳利父子公司 油墨供应单元

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717875A (en) * 1971-05-04 1973-02-20 Little Inc A Method and apparatus for directing the flow of liquid droplets in a stream and instruments incorporating the same
FR2197343A5 (de) * 1972-09-25 1974-03-22 Ibm
FR2236166A1 (de) * 1973-07-02 1975-01-31 Hertz Carl
FR2246396A1 (de) * 1973-10-06 1975-05-02 Agfa Gevaert Ag
US4017869A (en) * 1974-07-13 1977-04-12 Agfa-Gevaert, A.G. Ink recorder for the jet-ink-process
FR2374169A1 (fr) * 1972-11-21 1978-07-13 Ibm Aspirateur de gouttelettes dans une imprimante a jet d'encre

Family Cites Families (3)

* 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
US3839721A (en) * 1973-06-27 1974-10-01 Ibm Device for retention of ink jet nozzle clogging and ink spraying
US4160982A (en) * 1978-03-24 1979-07-10 A. B. Dick Company Anti-dispersion accumulator for ink jet printing system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717875A (en) * 1971-05-04 1973-02-20 Little Inc A Method and apparatus for directing the flow of liquid droplets in a stream and instruments incorporating the same
FR2197343A5 (de) * 1972-09-25 1974-03-22 Ibm
FR2374169A1 (fr) * 1972-11-21 1978-07-13 Ibm Aspirateur de gouttelettes dans une imprimante a jet d'encre
FR2236166A1 (de) * 1973-07-02 1975-01-31 Hertz Carl
FR2246396A1 (de) * 1973-10-06 1975-05-02 Agfa Gevaert Ag
US4017869A (en) * 1974-07-13 1977-04-12 Agfa-Gevaert, A.G. Ink recorder for the jet-ink-process

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN, Vol. 19, No. 6, Novembre 1976, page 2037 New York, U.S.A. R.E. PELKIE et al.: "Ink jet vacuum gutter" * Article en entier * *
IBM TECHNICAL DISCLOSURE BULLETIN, Vol. 19, No. 8, Janvier 1977, pages 3216-3217New York, U.S.A. K.A. KRAUSE: "Ink jet head" * Page 3217 en entier * *

Also Published As

Publication number Publication date
US4260996A (en) 1981-04-07
JPS55142667A (en) 1980-11-07
IT1149224B (it) 1986-12-03
CA1137537A (en) 1982-12-14
IT8020727A0 (it) 1980-03-18

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19801203

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19830113

RIN1 Information on inventor provided before grant (corrected)

Inventor name: WITTWER, ALVIN, LEROY