US3914772A - Ink jet type printing device - Google Patents

Ink jet type printing device Download PDF

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Publication number
US3914772A
US3914772A US409722A US40972273A US3914772A US 3914772 A US3914772 A US 3914772A US 409722 A US409722 A US 409722A US 40972273 A US40972273 A US 40972273A US 3914772 A US3914772 A US 3914772A
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US
United States
Prior art keywords
ink
nozzle
high voltage
output
heat sensitive
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
Application number
US409722A
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English (en)
Inventor
Toshio Kashio
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.)
Casio Computer Co Ltd
Original Assignee
Casio Computer Co Ltd
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 Casio Computer Co Ltd filed Critical Casio Computer Co Ltd
Application granted granted Critical
Publication of US3914772A publication Critical patent/US3914772A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
    • B41J2/03—Ink jet characterised by the jet generation process generating a continuous ink jet by pressure
    • 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
    • B41J2/072—Ink jet characterised by jet control by thermal compensation

Definitions

  • the device includes a high tension generator connected to the nozzle to supply electric charges to an ink to be jetted and a heat sensitive element arranged in the neighborhood of the nozzle to detect the temperature change of ink which causes the resistance of the heat sensitive element to be varied to permit an output voltage of the high tension generator to be variably controlled, thereby making the size of the ink droplets uniform for accurate printing.
  • This invention relates to an improved ink jet type printing device adapted to effect an accurate printing by making uniform the size of ink droplets jetted from a nozzle.
  • An ink jet type printing device is adapted to print characters etc. on a recording paper by jetting ink droplets from a nozzle having an inner diameter of about 100 p. and deflection controlling them.
  • the ink jetting is controlled by an ink feeding pressure relative to the nozzle and a potential difference applied in the ink jetting direction.
  • An accelerating plate is disposed between the nozzle and a platen on which a recording paper is carried. For example, a high voltage is applied between the accelerating plate and the nozzle to impart electric charge to an ink present in the nozzle and ink droplets are jetted, under the attraction of the accelerating plate, in the direction of a recording paper carried on a platen connected at the same potential as that of the accelerating plate.
  • the ink droplets are deflection controlled through deflection electrodes and a desired character is printed on a recording paper.
  • a desired character is printed on a recording paper.
  • the size of ink droplets jetted from the nozzle be made uniform. If the ink feeding pressure is kept constant, the size of ink droplets corresponds to the number of ink particles (ink jetting frequency) jetted per unit time and the ink jetting frequency is influenced by the viscosity of ink and the voltage applied to the nozzle.
  • the viscosity of ink is varied by the temperature of ink prevalent in the nozzle, and a relation between the temperature and the ink jetting frequency is such that, as shown in FIG.
  • the number of ink droplets to be jetted per unit time i.e. the ink jetting frequency is increased with a rise in temperature of ink.
  • the size of ink droplets is made smaller in proportion to the raise of the ink jetting frequency and the ink particle is strongly subjected to an action by the deflection electrode to increase its deflection angle, failing to print an accurate character etc. on a recording paper.
  • the object of this invention can be achieved by providing an ink jet type printing device comprising an ink jetting nozzle, a high voltage generator for applying electric charges to an ink to be jetted from the nozzle, 21 heat sensitive element for detecting the temperature of ink present in the nozzle and a control section for controlling an output voltage of the high tension generator in response to the output of the heat sensitive element.
  • an ink jet type printing device comprising an ink jetting nozzle, a high voltage generator for applying electric charges to an ink to be jetted from the nozzle, 21 heat sensitive element for detecting the temperature of ink present in the nozzle and a control section for controlling an output voltage of the high tension generator in response to the output of the heat sensitive element.
  • FIG. 1 is a partial block diagram showing one embodiment of this invention
  • FIG. 2 is a graphical representation showing a relation between the ink jetting frequency and the temperature of ink present in the nozzle;
  • FIG. 3 is a detailed circuit arrangement of a high tension generator of FIG. 1;
  • FIG. 4 is a graphical representation showing a relation between the ink jetting frequency and a voltage applied to the nozzle.
  • FIG. 5 is a graphical representation showing a relation between the temperature of ink present in the nozzle and an output voltage impressed to the nozzle from the high tension generator when the ink jetting frequency is made constant.
  • ink is supplied from an ink tank 12 to an ink jetting nozzle 11 by driving a pump 14 and jetted as ink droplets 17 through the orifice of the nozzle 11.
  • a platen 16 on which a recording paper 15 is carried is located at a predetermined distance from the forward end of the nozzle.
  • Deflection electrodes 18 are provided in the X-axis and Y-axis directions.
  • An accelcrating plate 30 is arranged between the deflection electrode 18 and the forward end of the nozzle 11.
  • An ink target 19 is disposed in the neighborhood of the platen and adapted to introduce ink droplets thereinto when printing is not effected.
  • Ink present in the ink jetting nozzle 1 l is charged by application of an output of a high voltage from a high tension (i.e., high voltage) generator. 20 connected to the nozzle.
  • a high tension generator 20 use may be made of a known DC-DC converter comprising a collector tuned type oscillator 31 and a voltage doubler circuit 32 as shown, for example, in FIG. 3.
  • the accelerating plate 30, platen l6 and ink target 19 are grounded relative to the nozzle to which is applied a high voltage, so that a high potential difference is created therebetween.
  • a constant voltage circuit 40 having an input potential control transistor 21 whose emitter terminal is connected to the input of the high tension generator 20 and whose collector terminal is grounded, a constant voltage diode 22, and a comparison control transistor 23 for comparing a constant voltage detected from the constant voltage diode 22 with an input voltage of the high tension generator 20 to control the transistor 21.
  • the output of the constant voltage circuit 40 is set by the control of a variable resistor 24.
  • a heat sensitive element 25 is provided in the neighborhood of the ink jetting nozzle 11.
  • One of the terminals of the heat sensitive element is connected one to the input terminal of the high tension (i.e., high voltage) generator 20 and the other to the base terminal of the transistor 23 through a resistor.
  • the X-electrodes and Y-electrodes of the deflection electrodes 18 are respectively connected to a deflection circuit 41.
  • the deflection circuit 41 is connected through a character generator 42 to an input device 43.
  • the character generator 42 issues, as neccessary, a driving instruction to the pump driving circuit 13 for driving a pump 14.
  • the detailed interrelation between the deflection circuit 41, character generator 42 and pump driving circuit 13 is disclosed in FIG. 2 of U.S. patent application Ser. No. 314,999.
  • Anink jetting frequency corresponding to the number of ink droplets jetted per unit time is increased with a rise in temperature of ink present in the nozzle 11 as shown in FIG. 2, and, as shown in FIG. 4, an increase in voltage applied to the nozzle 11 results in an increase in the ink jetting frequency. Therefore, the variation of the ink jetting frequency due to the variation in temperature0105 of ink present in the nozzle can be rectified by the control of a high tension output applied to the nozzle from the high tension generator 20.
  • the temperature of ink present in the nozzle is detected by the heat sensitive element 25 arranged in proximity to, and in parallel with, the nozzle 11 as shown in FIG. 1.
  • the heat sensitive element 25 has one end connected to one output terminal of the constant voltage circuit 40 and the other end connected between the resistors which are serially connected to the variable resistor 24 of the constant voltage circuit 40.
  • the heat sensitive element 25 senses the rise in temperature to cause its resistive value to be decreased to permit a base current of the transistor 23 to be increased, thereby decreasing the impedance between the emitter and the collector of the transistor 23.
  • the emitter potential of the input potential controlling transistor 21 is decreased and the input voltage of the high tension (i.e., high voltage) generator is decreased.
  • the output voltage from the high tension generator 20 is decreased.
  • the ink jetting frequency is decreased as is evident from FIG. 4.
  • the relation between a decrease in temperature of ink present in the nozzle 11 and decrease in output voltage is as shown in FIG. 5. Therefore, the size of ink droplets jetted from the orifice of the nozzle 11 is controlled to be held uniform irrespective of the temperature and the ink droplets are subject to a stable deflection through the deflection electrode 18. This permits an accurate character to be printed on a recording medium.
  • the heat sensitive element 25 is arranged in the neighborhood of the nozzle 11, it may be located in contact with the ink after a sufficient insulation is effected.
  • Nozzle 11 is, for example, a glass nozzle
  • Element 25 is a posister (Murata Seisakusho in Japan TYPE PTH60.T322M), positioned near the nozzle 11 within the housing of the printer, the internal temperature within the housing being substantially uniform throughout;
  • An ink jet type printing device for ejecting ink droplets of substantially uniform size, comprising:
  • a heat sensitive element (25) disposed adjacent to said nozzle (11) to detect the temperature of the ink supplied to said nozzle and for generating a detection output;
  • control means (40) variably controlling the output voltage from the high voltage generator (20) as a function of the detection output of said heat sensitive element (25), which detection output represents the ambient temperature of the ink supplied to said nozzle (11).
  • thermosensitive element comprises a variable resistance element, the resistance of which varies with the temperature thereof, said control means variably controlling the output voltage from the high voltage generator as a function of the resistance of said heat sensitive element.
  • An ink jet type printing device according to claim 2 wherein the resistance of said heat sensitive element decreases with a rise in temperature and increases with a drop in temperature.
  • control means comprises a constant voltage circuit, the constant voltage output of which is a function of the detection output of said heat sensitive element.
  • said high voltage generator comprises a DC-DC converter, the input of which is connected to the output of said control means whereby when the constant voltage output of said control means decreases, the high voltage output of said high voltage generator decreases, and when the constant voltage output of said control means increases, the high voltage output of said high voltage generator increases.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
US409722A 1972-10-27 1973-10-25 Ink jet type printing device Expired - Lifetime US3914772A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10711172A JPS5642026B2 (enrdf_load_stackoverflow) 1972-10-27 1972-10-27

Publications (1)

Publication Number Publication Date
US3914772A true US3914772A (en) 1975-10-21

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ID=14450734

Family Applications (1)

Application Number Title Priority Date Filing Date
US409722A Expired - Lifetime US3914772A (en) 1972-10-27 1973-10-25 Ink jet type printing device

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US (1) US3914772A (enrdf_load_stackoverflow)
JP (1) JPS5642026B2 (enrdf_load_stackoverflow)
DE (1) DE2353525C3 (enrdf_load_stackoverflow)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3971039A (en) * 1973-11-24 1976-07-20 Nippon Telegraph And Telephone Public Corporation Ink jet system printer with temperature compensation
US4007684A (en) * 1973-09-26 1977-02-15 Nippon Telegraph And Telephone Public Corporation Ink liquid warmer for ink jet system printer
US4275402A (en) * 1979-01-29 1981-06-23 Siemens Aktiengesellschaft Circuit arrangement for temperature-dependent voltage regulation of piezo-electric recording nozzles in ink mosaic recording devices
WO1981003306A1 (en) * 1980-05-16 1981-11-26 Commw Scient Ind Res Org Density control of jet printing droplets
JPS5713857A (en) * 1980-06-27 1982-01-23 Canon Inc Polychromatic ink jet recorder
JPS5713856A (en) * 1980-06-27 1982-01-23 Canon Inc Polychromatic ink jet recorder
US4352114A (en) * 1979-10-23 1982-09-28 Canon Kabushiki Kaisha Ink jet printer with temperature compensation
FR2575414A1 (fr) * 1984-12-28 1986-07-04 Canon Kk Appareil d'enregistrement par decharge de liquide
GB2189023A (en) * 1986-04-11 1987-10-14 Hunter Int Ltd Mounting a ventilator fan in a wall
FR2601625A1 (fr) * 1986-07-21 1988-01-22 Imaje Sa Tete d'impression a jet d'encre et traceur industriel qui en est equipe
EP0271904A3 (en) * 1986-12-17 1989-02-08 Canon Kabushiki Kaisha Liquid injection recording method
WO1991000807A1 (de) * 1989-07-07 1991-01-24 Siemens Aktiengesellschaft Verfahren und anordnung zur überwachung des tröpfchenausstosses aus austrittsdüsen eines tintendruckkopfes
US5302971A (en) * 1984-12-28 1994-04-12 Canon Kabushiki Kaisha Liquid discharge recording apparatus and method for maintaining proper ink viscosity by deactivating heating during capping and for preventing overheating by having plural heating modes
US5940098A (en) * 1995-08-16 1999-08-17 Nec Corporation Ink-jet printer using ink containing pigment particles
US6050665A (en) * 1996-09-19 2000-04-18 Brother Kogyo Kabushiki Kaisha Printing device with function for advising control unit of rank of mounted print head

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5226535U (enrdf_load_stackoverflow) * 1975-08-14 1977-02-24
US4079384A (en) * 1975-10-09 1978-03-14 Nippon Telegraph And Telephone Public Corporation Integrated ink liquid supply system in an ink jet system printer
JPS591594B2 (ja) * 1977-02-09 1984-01-12 株式会社日立製作所 インクジエツト記録装置
DE2941322C2 (de) * 1978-10-11 1986-02-20 Ricoh Co., Ltd., Tokio/Tokyo Farbstrahl-Drucker
US4310846A (en) * 1978-12-28 1982-01-12 Ricoh Company, Ltd. Deflection compensated ink ejection printing apparatus
JPS594310B2 (ja) * 1979-06-30 1984-01-28 株式会社リコー インクジェット記録装置
JPS5667267A (en) * 1979-11-08 1981-06-06 Ricoh Co Ltd Ink jet recording system
JPS5764559A (en) * 1980-10-07 1982-04-19 Ricoh Co Ltd Ink jet recorder
US4459469A (en) * 1981-05-15 1984-07-10 Ricoh Company, Ltd. Ink temperature control apparatus for ink jet printing apparatus
JPS60174654A (ja) * 1984-02-20 1985-09-07 Matsushita Electric Ind Co Ltd インクジエツト記録装置
JPS6164447U (enrdf_load_stackoverflow) * 1985-07-03 1986-05-01
JP2805775B2 (ja) * 1988-11-10 1998-09-30 神鋼電機株式会社 印刷装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3653932A (en) * 1969-08-28 1972-04-04 Teletype Corp Electrostatic printing composition comprising didodecyl sebacate
US3761953A (en) * 1972-10-24 1973-09-25 Mead Corp Ink supply system for a jet ink printer
US3787882A (en) * 1972-09-25 1974-01-22 Ibm Servo control of ink jet pump

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5417400B2 (enrdf_load_stackoverflow) * 1971-12-20 1979-06-29

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3653932A (en) * 1969-08-28 1972-04-04 Teletype Corp Electrostatic printing composition comprising didodecyl sebacate
US3787882A (en) * 1972-09-25 1974-01-22 Ibm Servo control of ink jet pump
US3761953A (en) * 1972-10-24 1973-09-25 Mead Corp Ink supply system for a jet ink printer

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007684A (en) * 1973-09-26 1977-02-15 Nippon Telegraph And Telephone Public Corporation Ink liquid warmer for ink jet system printer
US3971039A (en) * 1973-11-24 1976-07-20 Nippon Telegraph And Telephone Public Corporation Ink jet system printer with temperature compensation
US4275402A (en) * 1979-01-29 1981-06-23 Siemens Aktiengesellschaft Circuit arrangement for temperature-dependent voltage regulation of piezo-electric recording nozzles in ink mosaic recording devices
US4352114A (en) * 1979-10-23 1982-09-28 Canon Kabushiki Kaisha Ink jet printer with temperature compensation
WO1981003306A1 (en) * 1980-05-16 1981-11-26 Commw Scient Ind Res Org Density control of jet printing droplets
JPS5713857A (en) * 1980-06-27 1982-01-23 Canon Inc Polychromatic ink jet recorder
JPS5713856A (en) * 1980-06-27 1982-01-23 Canon Inc Polychromatic ink jet recorder
FR2575414A1 (fr) * 1984-12-28 1986-07-04 Canon Kk Appareil d'enregistrement par decharge de liquide
US5302971A (en) * 1984-12-28 1994-04-12 Canon Kabushiki Kaisha Liquid discharge recording apparatus and method for maintaining proper ink viscosity by deactivating heating during capping and for preventing overheating by having plural heating modes
GB2189023A (en) * 1986-04-11 1987-10-14 Hunter Int Ltd Mounting a ventilator fan in a wall
WO1988000529A1 (fr) * 1986-07-21 1988-01-28 Imaje S.A. Tete d'impression a jet d'encre et traceur industriel qui en est equipe
EP0262004A1 (fr) * 1986-07-21 1988-03-30 Imaje S.A. Tête d'impression à jet d'encre et traceur industriel qui en est équipé
US4905018A (en) * 1986-07-21 1990-02-27 Imaje S.A. Ink jet printing head and industrial plotter which is equipped with it
AU609410B2 (en) * 1986-07-21 1991-05-02 Imaje S.A. Ink jet printing head and industrial tracer fitted therewith
FR2601625A1 (fr) * 1986-07-21 1988-01-22 Imaje Sa Tete d'impression a jet d'encre et traceur industriel qui en est equipe
EP0271904A3 (en) * 1986-12-17 1989-02-08 Canon Kabushiki Kaisha Liquid injection recording method
US4980699A (en) * 1986-12-17 1990-12-25 Canon Kabushiki Kaisha Liquid injection recording method for accurately producing an image regardless of ambient temperature
WO1991000807A1 (de) * 1989-07-07 1991-01-24 Siemens Aktiengesellschaft Verfahren und anordnung zur überwachung des tröpfchenausstosses aus austrittsdüsen eines tintendruckkopfes
US5940098A (en) * 1995-08-16 1999-08-17 Nec Corporation Ink-jet printer using ink containing pigment particles
US6050665A (en) * 1996-09-19 2000-04-18 Brother Kogyo Kabushiki Kaisha Printing device with function for advising control unit of rank of mounted print head

Also Published As

Publication number Publication date
DE2353525A1 (de) 1974-05-09
JPS49100165A (enrdf_load_stackoverflow) 1974-09-21
JPS5642026B2 (enrdf_load_stackoverflow) 1981-10-01
DE2353525C3 (de) 1980-01-24
DE2353525B2 (de) 1975-10-23

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