EP0375462A2 - Appareil pour distribuer des petites quantités de liquide - Google Patents

Appareil pour distribuer des petites quantités de liquide Download PDF

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Publication number
EP0375462A2
EP0375462A2 EP89313553A EP89313553A EP0375462A2 EP 0375462 A2 EP0375462 A2 EP 0375462A2 EP 89313553 A EP89313553 A EP 89313553A EP 89313553 A EP89313553 A EP 89313553A EP 0375462 A2 EP0375462 A2 EP 0375462A2
Authority
EP
European Patent Office
Prior art keywords
valve
syringe
liquid
discharge
stem
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Withdrawn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
EP89313553A
Other languages
German (de)
English (en)
Other versions
EP0375462A3 (fr
Inventor
Hideyo Fujii
Takaji Shimada
Yukinaga Ohtani
Kazuteru Esawa
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.)
Nordson Corp
Original Assignee
Nordson 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 Nordson Corp filed Critical Nordson Corp
Publication of EP0375462A2 publication Critical patent/EP0375462A2/fr
Publication of EP0375462A3 publication Critical patent/EP0375462A3/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00573—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes the reservoir or container being pneumatically or hydraulically pressurized

Definitions

  • This invention relates to syringes for dispensing liquids and in particular to syringes for dispensing small amounts of liquid in a controlled fashion.
  • a known system for dispensing small amounts of liquids comprises firstly a syringe, generally formed of plastic material in the form of a tube. One end of the tube is connectable to an adaptor whilst the other is shaped as a nozzle or is provided with connection means whereby a nozzle may be attached thereto.
  • the syringe is provided filled with the liquid paint material and with both ends closed by stoppers.
  • the stoppers are removed and the syringe is attached to the adaptor.
  • the adaptor is connected to a source of pressurised air and includes a passage whereby the air is fed to the syringe to force the liquid therein through the discharge end thereof.
  • the supply of pressurised air is controlled by a valve which is in turn activated by a solenoid which is energised by a switch.
  • a timer is interposed between the switch and the solenoid which is operable, when the switch is pressed, to energise the solenoid for a preset period of time and thus cause the valve, which controls the supply of pressurised air to the syringe to also be opened for the preset period of time.
  • Apparatus for dispensing liquid in accordance with the invention comprises a syringe having a discharge end and an adaptor securable to the other end of the syringe through which pressurised air can be supplied to force liquid contained in the syringe to be discharged through the discharge end characterised in that a valve is provided for controlling the discharge of liquid from the discharge end of the syringe.
  • the arrangement is such that the liquid in the syringe is constantly pressurised. This ensures that when the valve is opened the full discharge velocity is almost instantaneously reached whereby the amount dispensed is directly proportional to the time the valve is open and can thus be very accurately controlled. Furthermore the fact that the maximum dispensing velocity is reached so quickly means there is little chance for liquid to stick to the nozzle end and form a drop which has to be manually brought into contact with the surface to be coated.
  • valve stem passes through at least part of the pressurised air supply passage in the adaptor.
  • the valve seat may be provided by a suitably shaped section of the discharge end of the syringe or of a nozzle attached thereto or may comprise an O-ring mounted on the discharge end or a nozzle attached thereto.
  • means are provided for opening the valve to allow discharge for a predetermined period of time.
  • valve stem is biased towards the valve seat by a spring to close the valve.
  • valve stem is moved away from the valve seat to allow discharge by the action of air pressure on a piston attached to the valve stem.
  • valve stem is provided with an iron core section mounted between two coils which can be electrically activated, the arrangement being such that this causes the iron core and hence the stem to move away from the valve seat.
  • the syringe 1 shown in Figure 1 comprises a tube 2 having a flange 3 near one end, the other end being shaped to form a discharge tube 4.
  • the syringe is generally made of plastic material, for example, polyethylene or polypropylene. Typical dimensions for the syringe are a diameter of between 15 to 25mm, a length of between 100 and 300mm, a tube wall thickness of between 1 and 1.5mm and a capacity of about 500cc.
  • the discharge tube 4 is formed with an internal screw 5 whereby a metallic nozzle 10 with a corresponding external screw can be attached thereto.
  • a quantity of liquid paint material is filled into the syringe 1 and the openings at either end of the syringe are sealed with stoppers P11, P12.
  • the syringe is to be on sale in this form and, as such, is commonly referred to as a "capsule of paint material".
  • the method of operation presently employed with syringe 1 is as follows.
  • the filled syringe is purchased by a manufacturer who first removes the sealed stoppers P11, P12 at the end of the syringe 1.
  • the flange 3 of the syringe 1 is then inserted into a "male - female" socket 78 of an adaptor 76 and then turned half way to produce a so-called quick pipe join.
  • the adaptor 76 serves to supply pressurised gas to the syringe 1.
  • the gas employed is air and we will therefore hereinafter refer to the gas as air.
  • the adaptor 76 contains a passage for the pressurised air 60 and, after mounting the adaptor on the syringe, a tube 61 is connected to the adaptor which communicates with the passage 60.
  • the tube 61 feeds compressed air (CA) at a fixed pressure from an air tank 75 to the adaptor 76 through a switch valve 63, provided in the tube 61.
  • the switch valve 63 is electronically operated by means of a solenoid system which forms part of an air pressure supply device 62.
  • the solenoid 64 is activated by a signal from a timer 67, which in turn may be controlled by a foot switch 68, to open the valve 63 and thus cause pressurised air to be passed into the syringe 1 through the air supply passage 60.
  • the air acts on the surface of the liquid L inside the syringe, the liquid therefore being discharged from the nozzle 10 attached thereto.
  • a discharge signal (H line) is issued by the foot switch 68. If the discharge time does not have to be very accurately controlled then the signal from the foot switch is passed directly to the solenoid. If the time has to be accurately controlled (to a number of micro sections), the signal is input into timer 67 which converts the signal to an exact time signal which is transmitted to the solenoid (I line). The time signal communicated to the solenoid 64 cause that to actuate the valve 63 (J line) which causes pressurised air (CA) to be fed from the tank 65 for the set amount of time. The air (CA) passes through the passage 60 in the adaptor 76 and enters the syringe 1.
  • the pressure of the air takes a finite amount of time to increase to the desired level after the valve is opened, and to descrease back to zero when the valve is closed, as shown in the K line.
  • the reason for this is the period of time required for the valve to move from the closed to the open position and also acts on the elasticity of the air, the length of the tube, the resistance within the tubing and the inertia of the air.
  • the velocity of the liquid discharged is proportional to the applied pressure (K line) and therefore the M line, which shows this, also has a slope at either end. The slope is in fact greater due to the additional factors of the resistance of the discharge path 4H and the nozzle exit 10H.
  • the discharge flow rate is approximately proportional to the velocity of the discharge (M line).
  • FIG. 5 shows an apparatus in accordance with the invention.
  • the same type of syringe 1 is employed and those parts which are identical to those employed in the known arrangement described above will not be further described herein.
  • the adaptor C has a valve stem 11 passing through air passage 13.
  • the pointed end part "of the valve stem” is dimensioned to fit closely in the inlet of the discharge port 4H of the syringe 1.
  • the opposite end of the valve stem is secured to a columnar iron core 12, housed inside the adaptor 6, a wire coil 15 being provided around the peripheral part of the iron core.
  • a spring 16 is mounted between the upper end of the iron core and the adaptor, and an adjusting screw 17 passes through the centre of the spring and thus restricts the valve stroke.
  • the air supply passage 13 branches approximately midway along its length, the branch line 14 being connected to an air joint fixture 18 which has a passage therein which serves to connect the branch line 14 and tubing 19.
  • Pressurised air from an air source 28 passes to the adaptor through the tubing 19 via a flow rate adjusting valve 24, a pressure adjusting valve 25 and an on/off valve 26.
  • the coil 15 inside the adaptor 6 is electronically connected to a timer 27 and thence to a foot switch 35.
  • the operation of the apparatus shown in Figure 5 is as follows.
  • the syringe, as purchased, has it's stoppers removed and is affixed to the adaptor 6.
  • the electric current to the coil 15 at this point is disconnected and the valve stem 11 is biased downwardly by the spring 16 to close the discharge end of the syringe 1.
  • the on/off valve 26 is opened and the pressure adjusting valve 25 and flow rate adjusting valve 24 are adjusted to supply air at the required pressure to the adaptor 6, that is, during the painting operation a constant pressure of air is always applied.
  • an electrical signal is sent by timer 27, either alone or as a result of closing of foot switch 35, which activates the coil 15 inside the adaptor 6.
  • the process is shown pictorially in the graphs of Figure 6.
  • the required constant air pressure is provided inside the syringe 1 (A line).
  • the discharge command is issued either directly from the timer 27, or via the foot switch 35 (B line).
  • the signal from the foot switch is converted inside the timer 27 and issued therefrom (C line).
  • the solenoid 15 inside the adaptor therefore, activates and is excited causing the iron core 12 and valve stem attached thereto to move upwards, thus opening the valve (D line).
  • the difference between the C line and the D line is a time lag caused by the inertia of the iron core which is very short, in the order of 0.1 ms, and therefore can be regarded as negligible.
  • the air pressure lowers a little (E line). However, the little air is replenished continuously. Thus the air pressure line does not contain a slope as is found with the known arrangement. It lowers a little as shown in the E line but it is flat. Thus the velocity of the discharge (F line) and the quantity of discharge (G line) appears flat too. The quantity of discharge becomes even and equal to the discharge time which, as explained above, does not occur with known systems.
  • the flow control valve When the required quantity has been discharged, the flow control valve is closed and the discharge interrupted.
  • the quantity discharged is determined by the degree to which the valve is opened and the time for which it opened which means that discharge of a very small amount can be performed. As mentioned above, no liquid drops stick and remain at the pointed end of the nozzle and it is thus not necessary to move the syringe manually towards the place or object to be painted. It is simply sufficient to direct the nozzle 10 of the syringe 1 horizontally (H direction) above the object to be painted and thus automation of the process is possible.
  • valve stem 4 is provided with a piston 42.
  • the valve stem is caused to move upward to open the liquid flow control valve by the action of air supplied via passage 48 in the adaptor, below the piston 42.
  • the piston is biased to close the valve by a spring 46 and a screw 47 is provided to limit the travel of the valve stem.
  • the solenoid system responds faster.
  • the air cylinder system can be employed.
  • the liquid flow control valve of Figures 5 and 7 generally comprises a needle valve.
  • a valve 52 made of elastic material, e.g. rubber, may be fitted to the pointed end part of the needle valve 51.
  • the discharge port of cylinder was employed as the valve seat.
  • the valve seat can be provided by the inlet port of a nozzle screwed to the discharge end of the syringe.
  • Nozzles are generally formed from metal and this means that the valve seat can be very accurately constructed by machining.
  • Figure 9 shows this, a nozzle 55 having a valve seat 55S provided at the inlet part of the nozzle port 55H by means of precision machining.
  • the nozzle 10 is connected to the syringe by means of threads cut in the external face of the nozzle and corresponding threads cut at the inner side of the outer tube of the double tube discharge section of the syringe.
  • the nozzle threads are provided on the nozzle internal face, whilst those on the syringe are provided on the outer side of the inner tube.
  • an O-ring can be employed as a valve seat.
  • the apparatus of the invention it is possible to perform discharge painting quickly and in the exact position required with very small quantity of paint. Automation of the discharge painting operation is possible.
  • the apparatus allows reduction of time and cost of materials in the manufacturing process and gives a great improvement in the quality of the product.
EP19890313553 1988-12-23 1989-12-22 Appareil pour distribuer des petites quantités de liquide Withdrawn EP0375462A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP16669088U JPH059099Y2 (fr) 1988-12-23 1988-12-23
JP166690/88 1988-12-23

Publications (2)

Publication Number Publication Date
EP0375462A2 true EP0375462A2 (fr) 1990-06-27
EP0375462A3 EP0375462A3 (fr) 1991-05-02

Family

ID=31454303

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890313553 Withdrawn EP0375462A3 (fr) 1988-12-23 1989-12-22 Appareil pour distribuer des petites quantités de liquide

Country Status (2)

Country Link
EP (1) EP0375462A3 (fr)
JP (1) JPH059099Y2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5277333A (en) * 1990-07-10 1994-01-11 Musashi Engineering, Inc. Apparatus for metering and discharging a liquid
EP0608129A1 (fr) * 1993-01-21 1994-07-27 Nordson Corporation Distributeur de liquide
GB2305472A (en) * 1995-09-19 1997-04-09 Advanced Paint Systems Ltd Paint dispenser for chipped paintwork
US5927560A (en) * 1997-03-31 1999-07-27 Nordson Corporation Dispensing pump for epoxy encapsulation of integrated circuits

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4743872B2 (ja) * 2006-04-21 2011-08-10 新日鐵化学株式会社 液状物吐出装置
JP6842152B2 (ja) * 2016-05-31 2021-03-17 武蔵エンジニアリング株式会社 液体材料吐出装置、その塗布装置および塗布方法
JP6583895B2 (ja) * 2018-02-07 2019-10-02 ＰＲＩＭＥｄｏｔ株式会社 液状物の吐出装置
JP7066229B2 (ja) * 2021-01-06 2022-05-13 武蔵エンジニアリング株式会社 液体材料吐出装置、その塗布装置および塗布方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2578918A (en) * 1949-06-01 1951-12-18 King Seeley Corp Paint applying apparatus
GB2035147A (en) * 1978-11-16 1980-06-18 Composite Applic Inc Fluid dispensing
WO1986004047A1 (fr) * 1985-01-04 1986-07-17 Leon Kanarvogel Appareil de distribution de liquide et cartouche a soupape anti-egouttement
DE3630910A1 (de) * 1986-09-11 1988-03-24 Grace Gmbh Vorrichtung zum austragen von fluessigem oder pastoesem material, insbesondere von dichtungsmaterial fuer behaelterverschluesse

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2578918A (en) * 1949-06-01 1951-12-18 King Seeley Corp Paint applying apparatus
GB2035147A (en) * 1978-11-16 1980-06-18 Composite Applic Inc Fluid dispensing
WO1986004047A1 (fr) * 1985-01-04 1986-07-17 Leon Kanarvogel Appareil de distribution de liquide et cartouche a soupape anti-egouttement
DE3630910A1 (de) * 1986-09-11 1988-03-24 Grace Gmbh Vorrichtung zum austragen von fluessigem oder pastoesem material, insbesondere von dichtungsmaterial fuer behaelterverschluesse

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5277333A (en) * 1990-07-10 1994-01-11 Musashi Engineering, Inc. Apparatus for metering and discharging a liquid
EP0608129A1 (fr) * 1993-01-21 1994-07-27 Nordson Corporation Distributeur de liquide
GB2305472A (en) * 1995-09-19 1997-04-09 Advanced Paint Systems Ltd Paint dispenser for chipped paintwork
GB2305472B (en) * 1995-09-19 1999-10-27 Advanced Paint Systems Ltd Paint dispensing method and apparatus
US5927560A (en) * 1997-03-31 1999-07-27 Nordson Corporation Dispensing pump for epoxy encapsulation of integrated circuits
US5992688A (en) * 1997-03-31 1999-11-30 Nordson Corporation Dispensing method for epoxy encapsulation of integrated circuits

Also Published As

Publication number Publication date
EP0375462A3 (fr) 1991-05-02
JPH0286670U (fr) 1990-07-09
JPH059099Y2 (fr) 1993-03-05

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