US3657599A - Ink accelerating unit for use in ink jet printer - Google Patents

Ink accelerating unit for use in ink jet printer Download PDF

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Publication number
US3657599A
US3657599A US123744A US3657599DA US3657599A US 3657599 A US3657599 A US 3657599A US 123744 A US123744 A US 123744A US 3657599D A US3657599D A US 3657599DA US 3657599 A US3657599 A US 3657599A
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United States
Prior art keywords
accelerating electrode
ink
center aperture
members
accelerating
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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
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US123744A
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English (en)
Inventor
Toshio Kashio
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Casio Computer Co Ltd
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Casio Computer Co Ltd
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    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D15/00—Component parts of recorders for measuring arrangements not specially adapted for a specific variable
    • G01D15/16—Recording elements transferring recording material, e.g. ink, to the recording surface
    • G01D15/18—Nozzles emitting recording material

Definitions

  • Unnecessa- PP N05 123,744 ry ink attached to the accelerating electrode may be sucked through the interface or interfaces between the disk member [30]
  • FIG. 1 A first figure.
  • the present invention relates to an ink jet recording device and more particularly an accelerating electrode structure for ink jet recording devices capable of preventing the contamination by unnecessary or excess ink.
  • the ink jet stream is liquid opposed to the electron beam or the like so that various parts in the ink jet recording devices are frequently contaminated by ink and their functions are adversely affected by the contamination. As a consequence the stable recording operation of the devices is not attained.
  • the ink jet recording device of the type in which thestream of electrically charged ink droplets is accelerated by an accelerator and horizontally and vertically deflected by the electrostatic force so as to write the characters and the like on a recording medium charged ink droplets tend to attach to the accelerating electrode due to the secondary emission, vibrations and some other reasons so that the ink accumulated upon the accelerating electrode causes the disturbance of the electric field, thereby causing the distortions of the characters and the like printed on the recording 'medium.
  • the secondary emission cannot be eliminated or overcome from the theoretical point of view, and there is no guarantee at all that the attachment of ink to the accelerating electrode due to the vibrations and other reasons may be effectively prevented.
  • the prior art generally disposes an accelerating electrode in front of a nozzle in spaced-apart relation therewith, the accelerating electrode with a thickness of 0.5 mm having a center aperture with a diameter of 1.5 mm.
  • the center aperture of the accelerating electrode is tapered so as to diverge toward the nozzle so that the ink droplets in the outer peripheral portion of the ink droplet beam or stream, that is undesired or unnecessary ink droplets caused to fly due to the secondary emission may be prevented to pass through the center aperture of the accelerating electrode by the tapered peripheral wall surface of the center aperture.
  • the tapered peripheral wall surface of the center aperture of the accelerating electrode must be sufficiently polished so that the undesired ink attached to the tapered surface may readily fall off therefrom.
  • the prior art accelerating electrode structure of the type described above has the following disadvantages:
  • I. Ink attached to the accelerating electrode may be removed only by gravity.
  • Machining of the accelerating electrode is difficult (a) because formation of the center aperture and polishing of the tapered peripheral surface thereof are difficult as the dimensions are 0.5 mm in thickness and 1.5 mm in inner diameter, and (b) because machining tolerance for forming the center aperture is very severe.
  • One of the objects of the present invention is therefore to provide an improved accelerating electrode structure for ink jet printers.
  • a plate or disk member is attached to one surface of an accelerating electrode so that unnecessary inkattached to the accelerating electrode may be sucked and discharged through the interface between the plate or disk member and the trode.
  • plate or disk members are attached on both surfaces of the accelerating electrode so that attached unnecessary ink may be sucked and discharged through the interfaces between the plate or disk members and the accelerating electrode.
  • grooves for collecting and discharging sucked unnecessary ink are formed in the surfaces of the plate or disk members in contact with the accelerating electrode, thereby facilitating the discharge of unnecessary ink out of the accelerating electrode structure.
  • the center apertures of the plate or disk members attached to the accelerating electrode are tapered so as to converge toward the accelerating electrode so that unnecessary ink attached to accelerating elecfaces.
  • FIG. 1 is a schematic diagram illustrating a writing part of an ink jet recording device to which is applied the present invention in one form;
  • FIG. 2 is a schematic diagram of electrical components for producing desired electric fields between the associated parts of ink jet recording device
  • FIG. 3 is a longitudinal sectional view of an accelerating electrode structure in accordance with the present invention.
  • FIG. 4 is an exploded view on enlarged scale and in cross section, thereof;
  • FIG. 5 is a cross section taken along the line A'-A' in FIG. 4 illustrating a first disk member
  • FIG. 6 is a cross section taken along the line B'-B in FIG. 4 illustrating a second disk member.
  • an ink jet writing head 10 is carried for reciprocal movement by a wire 13 wrapped around a pair of pulleys 11 and 12 which are driven by a motor 14.
  • the ink jet is ejected and impinged upon a recording medium (not shown) in response to the control signals, thereby synthesizing the characters or the like.
  • FIG. 2 is a diagrammatical view illustrating the principle of generating the electrostatic fields between the ink nozzle 20 and the acceleration electrode 21 and between the nozzle 20 and a platen 22.
  • a positive electrode is placed in the nozzle 20 made of a glass.
  • the electrically conductive ink to be supplied into the nozzle 20 is applied with a positive potential.
  • Both of the acceleration electrode 21 and the platen 22 are grounded.
  • a power source 23 has a high voltage of the order of for example 2,700 V.
  • the vertical and horizontal deflecting electrodes 24 and 25 are disposed forwardly of the acceleration electrode 21.
  • the ejected ink droplets are accelerated by the acceleration electrode 21, then deflected by the vertical and horizontal electrodes 24 and 25 in response to the control signals applied thereto and impinged at a desired position upon a recording medium 26 placed upon the platen 22.
  • the characters each consisting of a dot pattern may be sequentially synthesized upon the recording medium 26 by the ink droplets ejected in the aforementioned fashion.
  • FIG. 3 is a sectional view of an accelerating electrode structure in accordance with the present invention in which an accelerating electrode is a metal disk having a thickness of 0.03 mm, an inner diameter of 1.5 mm and an outer diameter of 7.2 mm and a center aperture 31.
  • a first perforated disk member 32 comprises a metal disk having a thickness of 0.2 mm, an inner diameter of 2.4 mm and an outer diameter of 7.2 mm and a center aperture 33, which is tapered as shown by 35 so as to converge toward the center aperture 31 of the accelerating electrode 30.
  • a second perforated disk member 36 comprises a metal disk with a thickness of 0.2 mm, an inner diameter of 3 mm and an outer diameter of 7.2 mm and having a center aperture 37 which is also tapered as indicated by 39.
  • the first perforated disk member 32, the accelerating electrode 30 and the second perforated disk member 36 are laminated in the order named in concentrical relation with each other and secured to each other for example by spot welding.
  • the assembly consisting of the first perforated disk member 32, the accelerating electrode 30 and the second perforated disk member 36 is mounted upon a supporting structure 40.
  • the capillary action at the interfaces between the first perforated disk member 32 and the accelerating electrode 30 and between the accelerating electrode 30 and the second perforated disk member 36 is used to sucking the unnecessary ink.
  • the suction caused by the capillary action will be referred to as the capillary suction hereinafter for brevity.
  • both of the first and second disk members 32 and 36 are provided with annular and straight grooves 34 and 38 respectively formed in the'surfaces in contact with the accelerating electrode 30 in order to further increase the capillary suction.
  • the present invention is not limited to the annular and straight grooves 34 and 38 and that any suitable grooves may be formed for increasing the capillary suction. Because of the construction of the accelerating electrode structure in accordance with the present invention, almost all of the unnecessary or undesired ink is attached to the accelerating electrode 30. From the foregoing description it is seen that the tapered center aperture 33 is provided for relaxing the effect of the electric field and that the ink will not adhere to the tapered surface of the center aperture 33 so that the tolerance in machining maybe relaxed.
  • the second disk member 36 is provided for sucking under the capillary suction the unnecessary ink attached to the rear surface (opposing to the recording medium) of the accelerating electrode 30 although the attachment of the ink to the rear surface is very rare.
  • the second diskmember 36 serves to simplify and facilitate the operation of joining the first disk member 32, the accelerating electrode 30 and the second disk member 36 together for example by spot welding.
  • the unnecessary ink is attached to the periphery of the center aperture 31 of the accelerating electrode 30 and is sucked into the interface between thefirst disk member 32 and the accelerating electrode 30 under the capillary suction.
  • a large suction area may be provided because the first and second disk members 32 and 36 are overlaid upon the accelerating electrode 30 over the whole inner periphery thereof.
  • the unnecessary ink sucked into the interfaces between the first and second disk members 32 and 36 on one hand and the accelerating electrode 30 on the other hand may be collected into the grooves 34 and 38 and discharged out of the accelerating electrode structure under the gravity into a suitable sump or the like (not shown) through fine wires (not shown) inserted into the grooves 34 and 38.
  • the ink in the grooves 34 and 38 will not adversely affect the electric field applied to the accelerating electrode structure.
  • the maximum ink suction area is provided so that the capillar gsuction of unnecessary ink may be much facilitated. 3. he thickness of the accelerating electrode 18 less so that the center aperture may be formed advantageously by a mechanical press with ease and a higher degree of accuracy.
  • the maching tolerance of the first disk member may be much relaxed as compared with the prior art disk member.
  • the present invention improves the suction of unnecessary ink and simplifies the fabrication of the accelerating electrode structure.
  • first and second disk members and the accelerating electrode have been described as being in the form of disk, but it is appreciated that the present invention is not limited thereto and that they may be in any suitable form.
  • An accelerating electrode structure for ink jet recording devices characterized in that upon one surface of a centerapertured thin accelerating electrode is overlaid concentrically and securely fixed a first member having a center aperture whose diameter is larger than said center aperture of said accelerating electrode and which is tapered so as to converge toward said accelerating electrode, whereby the unnecessary ink attached may be sucked into the interface between said first member and said accelerating electrode.
  • An accelerating electrode structure for ink jet recording devices characterized in that upon one surface of a centerapertured thin accelerating electrode is overlaid concentrically and securely fixed a first member having a center aperture whose diameter is larger than said center aperture of said accelerating electrode and which is tapered so as to converge toward said accelerating electrode, and upon the other surface of said thin accelerating electrode is overlaid concentrically and securely fixed a second member having a center aperture whose diameter is larger than that of said center aperture of said accelerating electrode and which is tapered to converge toward said accelerating electrode, whereby unnecessary ink attached may be sucked into the interfaces between said first and second members on one hand and said accelerating electrode on the other hand.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)
  • Facsimile Heads (AREA)
US123744A 1970-03-18 1971-03-12 Ink accelerating unit for use in ink jet printer Expired - Lifetime US3657599A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45022287A JPS5040616B1 (enrdf_load_stackoverflow) 1970-03-18 1970-03-18

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US3657599A true US3657599A (en) 1972-04-18

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3786516A (en) * 1970-12-16 1974-01-15 Casio Computer Co Ltd Deflection electrode device for an ink jet printing apparatus
US3921916A (en) * 1974-12-31 1975-11-25 Ibm Nozzles formed in monocrystalline silicon
US3938163A (en) * 1973-01-17 1976-02-10 Nippon Telegraph And Telephone Public Corporation Printed pattern inclination control in ink jet printer
US4015272A (en) * 1974-08-14 1977-03-29 Matsushita Electric Industrial Co., Ltd. Ink ejection type writing unit
US4135196A (en) * 1976-09-22 1979-01-16 Sharp Kabushiki Kaisha Grooved charging electrode in an ink jet system printer
US4272772A (en) * 1977-12-12 1981-06-09 Gould Inc. Priming apparatus for liquid ink writing instruments
US4599626A (en) * 1984-08-02 1986-07-08 Metromedia, Inc. Ink drop ejecting head
AU582581B2 (en) * 1984-10-15 1989-04-06 At & T Teletype Corporation Silicon nozzle structures and method of manufacture
US5038159A (en) * 1989-12-18 1991-08-06 Xerox Corporation Apertured printhead for direct electrostatic printing
EP3822081A1 (en) 2016-08-04 2021-05-19 Piotr Jeuté A drop on demand printing head and printing method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS551679U (enrdf_load_stackoverflow) * 1978-06-20 1980-01-08
JPS62203879U (enrdf_load_stackoverflow) * 1986-06-18 1987-12-26
JPS62203878U (enrdf_load_stackoverflow) * 1986-06-18 1987-12-26

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3458762A (en) * 1967-02-13 1969-07-29 Paillard Sa Writing head producing a jet of ink
US3577198A (en) * 1969-11-24 1971-05-04 Mead Corp Charged drop generator with guard system
US3586907A (en) * 1969-11-17 1971-06-22 Mead Corp Laminated coating head

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3458762A (en) * 1967-02-13 1969-07-29 Paillard Sa Writing head producing a jet of ink
US3586907A (en) * 1969-11-17 1971-06-22 Mead Corp Laminated coating head
US3577198A (en) * 1969-11-24 1971-05-04 Mead Corp Charged drop generator with guard system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3786516A (en) * 1970-12-16 1974-01-15 Casio Computer Co Ltd Deflection electrode device for an ink jet printing apparatus
US3938163A (en) * 1973-01-17 1976-02-10 Nippon Telegraph And Telephone Public Corporation Printed pattern inclination control in ink jet printer
US4015272A (en) * 1974-08-14 1977-03-29 Matsushita Electric Industrial Co., Ltd. Ink ejection type writing unit
US3921916A (en) * 1974-12-31 1975-11-25 Ibm Nozzles formed in monocrystalline silicon
US4135196A (en) * 1976-09-22 1979-01-16 Sharp Kabushiki Kaisha Grooved charging electrode in an ink jet system printer
US4272772A (en) * 1977-12-12 1981-06-09 Gould Inc. Priming apparatus for liquid ink writing instruments
US4599626A (en) * 1984-08-02 1986-07-08 Metromedia, Inc. Ink drop ejecting head
AU582581B2 (en) * 1984-10-15 1989-04-06 At & T Teletype Corporation Silicon nozzle structures and method of manufacture
US5038159A (en) * 1989-12-18 1991-08-06 Xerox Corporation Apertured printhead for direct electrostatic printing
EP3822081A1 (en) 2016-08-04 2021-05-19 Piotr Jeuté A drop on demand printing head and printing method

Also Published As

Publication number Publication date
JPS5040616B1 (enrdf_load_stackoverflow) 1975-12-25

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