EP0525998A1 - Farbspritzapparat - Google Patents

Farbspritzapparat Download PDF

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Publication number
EP0525998A1
EP0525998A1 EP92306076A EP92306076A EP0525998A1 EP 0525998 A1 EP0525998 A1 EP 0525998A1 EP 92306076 A EP92306076 A EP 92306076A EP 92306076 A EP92306076 A EP 92306076A EP 0525998 A1 EP0525998 A1 EP 0525998A1
Authority
EP
European Patent Office
Prior art keywords
ink
ink jet
tube member
air
air brush
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Withdrawn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
EP92306076A
Other languages
English (en)
French (fr)
Inventor
Zituo Ueno
Shysei Murai
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.)
Ricoh Digital Painting Co Ltd
Original Assignee
LAC 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 LAC Corp filed Critical LAC Corp
Publication of EP0525998A1 publication Critical patent/EP0525998A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • B05B1/3053—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice the actuating means being a solenoid
    • 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
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/05—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers produced by the application of heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet
    • 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
    • B41J2202/02—Air-assisted ejection

Definitions

  • This invention relates to an improvement of an air brush to be used in an automatic painting apparatus.
  • an air brush is used as an ink jet type pen.
  • Such an air brush is designed to draw and spray ink from a jet outlet of an ink jet tube in the presence of a negative pressure caused by an air jet.
  • FIG. 6 An air brush shown in Figure 6 has been proposed in EP-0317219 for use in the above-indicated automatic painting apparatus.
  • This air brush has a double-tube structure including an outer air jet tube member 1 and an inner ink jet tube member 2.
  • a needle member 3 In the ink jet tube member 2 is provided a needle member 3 for controlling the amount of ink to be released.
  • a solenoid type drive mechanism is coupled to the rear end of the needle member 3.
  • the needle member controls the ink jet outlet.
  • numeral 5 denotes a compressed air flow inlet
  • 6 designates an ink flow inlet.
  • the air brush in the above-indicated automatic painting apparatus is superior to an air brush of a type configured to control the released amount of ink by adjusting the supplied air pressure in that it performs more precise control of the released amount of ink for forming pixels.
  • the needle member since the needle member is moved at a speed as high as several thousands times of reciprocation per second, its frictional contact with the ink jet tube member is violent during its reciprocal movements. Therefore, the ink jet outlet wears or peels off in a short time, and the life of the air brush is short. Further, the needle member requires significant energy for reciprocal movements, which prevents speed-up of the reciprocal movements. That is, the frequency for on/off action of the needle member is low, and high-speed painting is not possible.
  • a further object of the invention is to provide a painting air brush that can provide uniform release of jet ink without being affected by ejected air.
  • the invention is based on a painting air brush for drawing and spraying ink from an ink jet outlet of an ink jet tube member in the presence of a negative pressure produced when air is ejected from an annular air jet outlet encircling the ink jet outlet, and it is characterized in that a valve mechanism for controlling the released amount of ink to the ink jet tube member is provided at a rear portion of the ink jet tube member.
  • the ink jet outlet of the ink jet tube member may be formed by cutting the tube aslant from one side or opposite sides.
  • the ink jet outlet since the ink jet outlet has the aforementioned unique configuration, air found in front of the ink jet outlet forms a laminar flow. As a result, no vortex flow occurs, and the site of the ink jet outlet through which the ink flows does not vary but is maintained constant.
  • Figure 1 is a side elevation of a painting air brush embodying the invention.
  • Figure 2 is a cross-sectional view of the air brush.
  • Figure 3 is a perspective view of an ink jet tube member.
  • Figure 4 is a cross-sectional view of a painting air brush taken as a further embodiment of the invention.
  • Figure 5 is a perspective view of an ink jet tube member.
  • Figure 6 is a cross-sectional view of an existing painting air brush.
  • Figure 7 is a cross-sectional view of an ink jet tube member having a different shape of ink jet outlet, for use in the foregoing embodiments.
  • Figure 8 is a cross-sectional view of the ink jet tube member of Figure 7 for showing an ink flow status in the tube member.
  • FIGS 1 to 3 show an embodiment of the invention.
  • reference numeral 1 refers to an air jet tube member, 2 to an ink jet tube member, and 7 to a supporting member that supports both tube members at their rear ends.
  • the ink jet tube member 2 may have the jet outlet 2c shown in Figure 7, but it may have an angled jet outlet 2a made by cutting the tube aslant from one side, as will be explained later, in order to reduce uneven release of ink.
  • the cutting angle of the jet outlet 2a is selected from the range of 30 to 35 degrees.
  • the supporting member 7 defines therein an ink valve chamber 8 communicating with the interior of the ink jet tube member 2.
  • the outlet from the ink valve chamber 8 is shaped into a conical valve seat 8a.
  • a valve member 9 secured on an operating rod 10 engages with or disengages from the valve seat 8a to shut or open the communication.
  • the operating rod 10 has an extension extending to the exterior beyond the supporting member 7 and coupled to a solenoid type actuating mechanism 11.
  • Numeral 12 denotes a support base.
  • the released amount of ink can be adjusted, without using a needle member, by controlling the opening amount of the valve member 9 through the operating rod 10 moved by the solenoid type actuating mechanism 11 while maintaining the supplied air pressure constant.
  • ink jet outlet is formed as 2c in Figure 7
  • uneven release of ink may occur, which makes it impossible to provide a density gradation in precise correspondence to the ink jet amount, in particular, when control is made to reduce the released amount of ink.
  • the angled jet outlet 2a made by cutting the ink jet outlet from one side, jet air forms a a laminar flow running along the angled surface of the jet outlet 2a as shown by arrows in Figure 2, and a vortex flow hardly occurs.
  • the ink flow site in the ink jet outlet does not vary but is maintained constant. For example, when the jet outlet is a downward slope as illustrated, the ink flows toward the sharp end of the jet outlet, and the jet direction is determined by the flow position.
  • ink was sprayed by using an air brush in which the ink jet tube member 2 has an inner diameter of 0.2mm and an outer diameter of 0.4mm, an air jet tube member 1 has an inner diameter of 0.9mm, and the ink jet outlet is cut by an angle of 30 degrees from one side thereof, by maintaining the air pressure constant, under a constant air pressure, by controlling the opening amount of the valve member 9 so as to provide a small amount of ink by the solenoid type actuating mechanism 11 via the operating rod 10.
  • an image with a density gradation corresponding to the released amount of ink was obtained.
  • FIGS 4 and 5 show another embodiment of the invention.
  • This invention uses the jet outlet 2b formed by cutting the ink jet tube member 2 aslant from opposite sides.
  • jet air forms a laminar flow running along the angled surfaces of the jet outlet 2b as shown by arrows in Figure 4, and a vortex flow hardly occurs.
  • the laminar-flow effect is more excellent than that of the foregoing embodiment. This was confirmed by an image painting experiment.
  • valve mechanism is provided at the back of the ink jet tube member, released amount of ink can be controlled precisely in the same manner as is done by an air brush using a needle member, while maintaining the supplied air pressure constant. Further, since no needle is used, the ink jet tube member does not wear by friction, and has a long life.
EP92306076A 1991-07-02 1992-07-01 Farbspritzapparat Withdrawn EP0525998A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP186974/91 1991-07-02
JP18697491 1991-07-02

Publications (1)

Publication Number Publication Date
EP0525998A1 true EP0525998A1 (de) 1993-02-03

Family

ID=16197984

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92306076A Withdrawn EP0525998A1 (de) 1991-07-02 1992-07-01 Farbspritzapparat

Country Status (6)

Country Link
EP (1) EP0525998A1 (de)
KR (1) KR930002097A (de)
AU (1) AU1866092A (de)
CA (1) CA2071620A1 (de)
IL (1) IL102285A0 (de)
ZA (1) ZA924671B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999058254A1 (de) * 1998-05-07 1999-11-18 Elektrobau Wehrmann Gmbh Sprühvorrichtung zur behandlung von schnitt- und fräskanten
CN101495241B (zh) * 2006-06-16 2012-09-19 曼泰克株式会社 喷嘴装置、使用该喷嘴装置的药液的供给方法
CN107415520A (zh) * 2016-05-24 2017-12-01 天津王朝包装印刷制品有限公司 一种用于纸箱表面书写的记号笔

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989011916A1 (en) * 1988-06-10 1989-12-14 Kodak Limited Nozzle for gas-operated spraying apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989011916A1 (en) * 1988-06-10 1989-12-14 Kodak Limited Nozzle for gas-operated spraying apparatus

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 014, no. 211 (C-0715)2 May 1990 & JP-A-02 048 057 ( MARKTEC CORP. ) 16 February 1990 *
PATENT ABSTRACTS OF JAPAN vol. 015, no. 035 (M-1074)28 January 1991 & JP-A-02 274 560 ( KOMORI ) 8 November 1990 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999058254A1 (de) * 1998-05-07 1999-11-18 Elektrobau Wehrmann Gmbh Sprühvorrichtung zur behandlung von schnitt- und fräskanten
CN101495241B (zh) * 2006-06-16 2012-09-19 曼泰克株式会社 喷嘴装置、使用该喷嘴装置的药液的供给方法
CN107415520A (zh) * 2016-05-24 2017-12-01 天津王朝包装印刷制品有限公司 一种用于纸箱表面书写的记号笔

Also Published As

Publication number Publication date
KR930002097A (ko) 1993-02-22
AU1866092A (en) 1993-01-07
IL102285A0 (en) 1993-01-14
CA2071620A1 (en) 1993-01-03
ZA924671B (en) 1993-03-31

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