EP0899015A1 - Pulversprühpistole mit Schalter zum Verändern der versprühten Pulvermenge - Google Patents

Pulversprühpistole mit Schalter zum Verändern der versprühten Pulvermenge Download PDF

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Publication number
EP0899015A1
EP0899015A1 EP98114891A EP98114891A EP0899015A1 EP 0899015 A1 EP0899015 A1 EP 0899015A1 EP 98114891 A EP98114891 A EP 98114891A EP 98114891 A EP98114891 A EP 98114891A EP 0899015 A1 EP0899015 A1 EP 0899015A1
Authority
EP
European Patent Office
Prior art keywords
hand
gun
powder
powder coating
coating
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Withdrawn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
EP98114891A
Other languages
English (en)
French (fr)
Inventor
Mikio Ransburg Industrial Finishing K.K. Katoh
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.)
Carlisle Fluid Technologies Ransburg Japan KK
Original Assignee
Ransburg Industrial Finishing KK
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 Ransburg Industrial Finishing KK filed Critical Ransburg Industrial Finishing KK
Publication of EP0899015A1 publication Critical patent/EP0899015A1/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Withdrawn legal-status Critical Current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
    • 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
    • B05B7/14—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 designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
    • B05B5/032—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying for spraying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1683—Arrangements for supplying liquids or other fluent material specially adapted for particulate materials

Definitions

  • This invention generally relates to electrostatic coating using a powder coating material and more particularly to a hand-gun for powder coating and a coating system incorporating the same.
  • a conventional powder coating hand-gun comprises a barrel portion, a grip portion and a trigger. An operator can hold the grip portion with its one hand and squeeze the trigger with the forefinger to spray a coating powder material entrained in air from an injector toward an object to be coated through a discharge port at an end of the barrel portion.
  • the trigger is equipped with means for effecting on-off control of discharge of the powder from the hand-gun. Regulation of the amount of the powder discharged from the hand-gun is made by adjusting the amount of control air supplied to the injector.
  • a valve mounted in a controller more specifically on a control panel, is adjusted to regulate the amount of the powder coating material discharged from the hand-gun.
  • an operator pre-sets the amount of the powder discharged from the gun at a preparation step by adjusting the valve on the control panel prior to initiating coating operation, but for example, in the case where the rate of conveying a line of objects to be coated should be changed or in the case where an object to be coated comprises a box having corners inside, problems such as over-spraying tend to occur and the operator handling the hand-gun must be skillful in addressing these problems.
  • the operator can stop the coating operation to adjust the valve on the control panel again, but in terms of operating efficiency, it is not preferred that the coating operation be interrupted every time adjustment of the valve is needed.
  • An object of the present invention is to provide a powder coating hand-gun usable in an electrostatic coating method in which the powder coating hand-gun is instantaneously responsive to a change or variation in the coating conditions during the coating operation without the need for interrupting the coating operation, and to provide a coating system incorporating the same.
  • a powder coating hand-gun having a grip portion and a barrel portion and usable in an electrostatic coating system for discharging a powder coating material toward an object to be coated, characterized in including means disposed at a position in which it can be operated by a finger of an operator's hand without loosening the operator's hold on said grip portion for changing the amount of the powder coating material discharged from said hand-gun.
  • the present invention enables the operator to change the mount of the powder discharged from the hand-gun by means or the switch provided in the hand-gun for changing the amount of the discharged powder without loosening the operator's hold on the hand gun, in other words, all the while continuing the coating operation, thereby instantaneously changing the amount of the the coating material from the gun in response to changes in coating condition.
  • means for changing the discharge of the powder coating material or the switch as described above is preferably disposed within an area in which it can be operated by the thumb of the operator's hand holding said grip portion, or alternatively a switch which is sensitive to the amount of squeeze of the trigger or responsive to the motion of squeezing the trigger when it is squeezed may be disposed in a position in which it can be operated by the forefinger of the operator's hand so that the amount of the powder coating material discharged from the gun be changed in response to a signal from this switch.
  • FIG. 1 shows a general view of an electrostatic powder coating system 1 .
  • the powder coating system 1 comprises a pressurized air source 2 such as a compressor, a controller 4 for controlling the air from the pressurized air source 2 , a powder source 6 such as a container or a hopper containing a powder coating material, an injector 8 such as a venturi which sucks the powder from the source 6 and discharges the powder under the action of the pressurized air supplied from the controller 4 , and a hand-gun 12 which sprays the powder coating material entrained in conveying air through a flexible tube or hose 10 from the injector 8 toward an object to be coated (not shown).
  • a pressurized air source 2 such as a compressor
  • a controller 4 for controlling the air from the pressurized air source 2
  • a powder source 6 such as a container or a hopper containing a powder coating material
  • an injector 8 such as a venturi which sucks the powder from the source 6 and discharges the powder under
  • the amount of the powder discharged from the injector 8 or the amount of the coating material sprayed from the hand 12 can optionally be regulated by controlling the control air fed into the injector 8 from the controller 4 .
  • This control is made by adjusting a regulating valve (not shown) self-contained in the controller 4 and will be described later with reference to FIG. 3.
  • the system 1 is well known in the art and will not be described in greater detail.
  • the amount of the coating material sprayed from the gun 12 is pre-set by an operator at a preparation step prior to the coating operation.
  • FIG. 2 is a side view of a band-gun in accordance with the present invention.
  • the hand-gun 12 includes a barrel portion 14 and a grip portion 16 which is equipped with a trigger 18 .
  • a trigger 18 For performing coating operation, an operator can hold the grip portion 16 with one hand and direct the forward end of the barrel portion toward the object (not shown) and then squeeze the trigger 18 with the forefinger F to spray the powder toward the object through a discharge port 20 at the forward end of the barrel portion 14 .
  • the hand-gun 12 includes a switch 22 for changing the amount of the powder discharged from the port 20 .
  • the switch 22 may be located on any of the barrel portion 14 and the grip portion 16 and is preferably disposed within an area in which it can be operated by the thumb T of the operator's hand holding the hand-gun 12 . If the operator is right-handed, as shown in FIG. 2, the switch 22 may be disposed within an area in which it can be operated by the thumb T of the right hand when the operator holds the gun 12 with the right hand, such as on the left side of the rearward section of the barrel portion 14 as illustrated in FIG. 2. Thus, the operator can release and stand only the thumb T of the right hand from the grip portion 16 to thereby operate the switch 22 while continuously holding the gun 12 with the other fingers during the coating operation.
  • the switch 22 in this embodiment comprises a push switch, but other types of switches may also be used.
  • a variety of types of switches such as a rotary switch and a toggle switch are known and any of the known switches may be used.
  • a push switch, which can be on and off only by pushing it with a finger, and a toggle switch, which the operator can actuate by moving a swing lever, are preferred since these switches require no particular labor or attention to turn on and off and the operator can change the amount of the powder sprayed from the gun 12 throughout the coating operation.
  • a toggle switch is more advantageous since the force for operating the switch 22 is not oriented in a direction across the axis of the barrel portion 14 and the direction of the barrel portion 14 or the direction in which the coating material is sprayed from the gun 12 will not be changed when the switch is operated.
  • a water-proof toggle switch under M-W Series sold by NIKKAI Co. is preferred.
  • FIG. 3 shows part of an air line disposed within the controller 4 .
  • Reference numeral 30 represents a main conduit for feeding the pressurized air received from the source 2 such as a compressor to an injector 8 and the arrow as shown indicates the direction in which the air flows.
  • the conduit 30 includes, sequentially from upstream to downstream, a main solenoid valve (SOL-M) 32 , an upstream regulating valve (AR-M) 34 and a high flow rate solenoid valve (SOL-H) 36 .
  • the main conduit 30 also includes a by-bass conduit 38 to by-bass the high discharge solenoid valve 36 .
  • the bypass conduit 38 is connected at its upstream end to the main conduit 30 between the upstream regulating valve 34 and the high flow rate solenoid valve 36 and is connected at its downstream end to the main conduit 30 downstream of the high flow rate solenoid valve 36 .
  • the main conduit 30 further includes, sequentially from upstream to downstream, an downstream regulating valve (AR-L) 40 and a low flow rate solenoid valve (SOL-L) 42 .
  • the main solenoid valve 32 is subjected to on-off control by operating the trigger 18 of the gun 12 . Specifically, as is known in the art, the main solenoid valve 32 is subjected to on-off control by the starting motion of the trigger such that when the operator squeezes the trigger 18 , the main solenoid valve will be turned on to open the main conduit 30 and when the operator releases the trigger, the main solenoid valve will be turned off to close the main conduit 30 .
  • the high flow rate solenoid valve 36 and the low flow rate solenoid valve 42 are subjected to on-off control by operating the switch 22 .
  • the high flow rate solenoid valve 36 will be turned on and the low flow rate solenoid valve 42 will be turned off to generate a first mode in which the main conduit is opened and the bypass conduit 38 is closed.
  • the control air is supplied to the injector 8 via the main conduit 30 .
  • the high flow rate solenoid valve 36 will be turned off and the low flow rate solenoid valve 42 will be turned on to generate a second mode in which the main conduit is closed and the bypass conduit 38 is opened.
  • the control air is supplied to the injector 8 by means of the bypass conduit 38 .
  • the flow rate of the control air in the first mode or the flow rate of the air at which it is fed to the injector through the main conduit 30 can be regulated in a non-stepped manner by manually operating the upstream regulating valve 34 .
  • a first meter (AG-H) 44 connected to the upstream valve 34 makes it possible to confirm the flow rate of the control air after it is regulated or the amount of the powder discharged from the gun 12 which amount is controlled by the upstream valve 34 .
  • This amount of the powder discharged in the first mode is set, for example, at a rate of 400 g/cm 3 .
  • the flow rate of the control air in the second mode or the flow rate of the air at which it is fed to the injector via the bypass conduit 38 can be regulated in a non-stepped manner by manually operating the downstream valve 40 .
  • a second meter (AG-L) 46 connected to the downstream valve 40 makes it possible to confirm the flow rate of the control air after it is regulated or the amount of the powder discharged from the gun 12 which amount is controlled by the downstream valve 40 .
  • This amount of the powder discharged in the second mode is set, for example, at a rate of 200 g/cm 3 .
  • the operator sets the amount of the powder discharged in the first mode at an appropriate rate by operating the upstream valve 34 and the amount of the powder discharged in the second mode at an appropriate rate by operating the downstream valve 40 .
  • the amount of the powder discharged in the second mode which is set at a relatively low rate is preferably set at a rate such that the difference between the amounts of the discharge in the first mode and in second mode will be sufficiently considerable to visually recognize a change in the amount of the discharged powder which occurs when the mode is switched.
  • the amount of the powder discharged in the second mode is preferably set at a rate of 200 g/cm 3 to 150 g/cm 3 and if the amount of the powder discharged in the first mode is set at a rate of 300 g/cm 3 , the amount of the powder discharged in the second mode is preferably set at a rate of 100 g/cm 3 .
  • an object to be coated comprises a box
  • the switch 22 can simply be operated to switch the mode to the second mode whereby the amount of the powder coating material discharged from the gun 12 can be instantaneously reduced.
  • a uniform thickness of the coating can be achieved without producing the "splash of coating material" which could occur with over-splaying or excess coating.
  • a rate of conveying a line of objects to be coated is changed. If a rate of line is changed to a low rate, the amount of the powder discharged from the gun 12 can accordingly be switched to that of the second or low discharge mode.
  • the operator can instantaneously switch the mode to the high amount discharge mode or the low amount discharge mode all the while spraying the powder toward the object from the hand-gun without interrupting the coating operation, thereby improving operating and coating efficiencies or uniformity of the coating.
  • a rate of line is initially set at a low rate
  • the switch 22 can simply be operated to adequately set the mount of the powder to be discharged corresponding to the rate of line without effecting the presetting or operating the upstream valve 34 of the controller 4 prior to starting the coating operation, whereby the presetting prior to the coating operation can be eliminated.
  • FIG. 4 is a side view of a hand-gun according to the second embodiment of the present invention with like elements bearing the same reference numerals as in the first embodiment as described above.
  • the overall shape of the hand-gun is illustrated in phantom line for clarity of the essential part of this embodiment.
  • a hand-gun 50 includes a built-in switch or sensor 54 associated with a pivot 52 of the trigger 18.
  • the switch or sensor 54 corresponds to the switch 22 of the first embodiment and is adapted to switch the first or high discharge mode and the second or low discharge mode as described above depending on the amount of squeezing the trigger 18 .
  • the setting of the switching timing of the first and second modes can optionally be made.
  • the gun 50 is set to operate in the first mode when the trigger 12 is squeezed to the maximum limit position (which is indicated by “ H ”) and in the second mode when the trigger 12 assumes a position which does not reach the maximum limit position (which is indicated by “ L ").
  • the operator can control the increase or decrease in the amount of the powder discharged from the gun 50 between the first and second modes by simply squeezing the trigger 18 to the maximum limit or slightly loosening the trigger depending on the varying coating conditions.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Nozzles (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP98114891A 1997-08-21 1998-08-07 Pulversprühpistole mit Schalter zum Verändern der versprühten Pulvermenge Withdrawn EP0899015A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP9224861A JPH1157539A (ja) 1997-08-21 1997-08-21 粉体塗装用ハンドガン及びこれを組み込んだ塗装システム
JP224861/97 1997-08-21

Publications (1)

Publication Number Publication Date
EP0899015A1 true EP0899015A1 (de) 1999-03-03

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EP98114891A Withdrawn EP0899015A1 (de) 1997-08-21 1998-08-07 Pulversprühpistole mit Schalter zum Verändern der versprühten Pulvermenge

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EP (1) EP0899015A1 (de)
JP (1) JPH1157539A (de)
CA (1) CA2245315A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000010723A1 (de) * 1998-08-22 2000-03-02 Itw Gema Ag Manuelle sprühbeschichtungspistole
US8584973B2 (en) 2007-10-31 2013-11-19 Nordson Corporation Powder coating gun with manually operated controls on gun
EP2055391B1 (de) 2007-10-31 2015-12-09 Nordson Corporation Verbesserte Sprühpistolen-Auslösevorrichtung und Verfahren
JP2018047432A (ja) * 2016-09-23 2018-03-29 旭サナック株式会社 塗装制御装置及び塗装装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3008645A (en) * 1958-01-14 1961-11-14 Sames Mach Electrostat Electrostatic spraying apparatus
DE1966244A1 (de) * 1968-04-26 1972-02-24 Mueller Ernst Kg Vorrichtung zum Auftragen von Pulver auf Werkstuecke unter Anwendung einer Zellradschleuse zur Abnahme des Pulvers aus dem Vorratsbehaelter
US3674209A (en) * 1969-10-06 1972-07-04 Atlas Copco Ab Spray gun
DE2264386A1 (de) * 1971-11-02 1973-05-30 Nordson Corp Elektrostatische spruehpistole
US3940061A (en) * 1974-09-16 1976-02-24 Champion Spark Plug Company Electrostatic spray gun for powder coating material
JPS5559860A (en) * 1978-10-30 1980-05-06 Kansai Paint Co Ltd Electrostatic powder spray gun
US4216915A (en) * 1977-05-12 1980-08-12 Kurt Baumann Electrostatic powder spray gun

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3008645A (en) * 1958-01-14 1961-11-14 Sames Mach Electrostat Electrostatic spraying apparatus
DE1966244A1 (de) * 1968-04-26 1972-02-24 Mueller Ernst Kg Vorrichtung zum Auftragen von Pulver auf Werkstuecke unter Anwendung einer Zellradschleuse zur Abnahme des Pulvers aus dem Vorratsbehaelter
US3674209A (en) * 1969-10-06 1972-07-04 Atlas Copco Ab Spray gun
DE2264386A1 (de) * 1971-11-02 1973-05-30 Nordson Corp Elektrostatische spruehpistole
US3940061A (en) * 1974-09-16 1976-02-24 Champion Spark Plug Company Electrostatic spray gun for powder coating material
US4216915A (en) * 1977-05-12 1980-08-12 Kurt Baumann Electrostatic powder spray gun
JPS5559860A (en) * 1978-10-30 1980-05-06 Kansai Paint Co Ltd Electrostatic powder spray gun

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 004, no. 098 (C - 018) 15 July 1980 (1980-07-15) *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000010723A1 (de) * 1998-08-22 2000-03-02 Itw Gema Ag Manuelle sprühbeschichtungspistole
US8584973B2 (en) 2007-10-31 2013-11-19 Nordson Corporation Powder coating gun with manually operated controls on gun
EP2055392B1 (de) 2007-10-31 2015-10-21 Nordson Corporation Sprühpistole mit Anzeige und Steuermittel auf der Pistole
EP2055391B1 (de) 2007-10-31 2015-12-09 Nordson Corporation Verbesserte Sprühpistolen-Auslösevorrichtung und Verfahren
US9227209B2 (en) 2007-10-31 2016-01-05 Nordson Corporation Apparatus and methods for controlling material application device
US9713817B2 (en) 2007-10-31 2017-07-25 Nordson Corporation Coating material spray gun
EP2055392B2 (de) † 2007-10-31 2019-05-01 Nordson Corporation Sprühpistole mit Anzeige und Steuermittel auf der Pistole
EP3020484B1 (de) 2007-10-31 2020-08-19 Nordson Corporation Verbesserte sprühpistolen-auslösevorrichtung und verfahren
EP2055391B2 (de) † 2007-10-31 2022-02-09 Nordson Corporation Verbesserte Sprühpistolen-Auslösevorrichtung und Verfahren
JP2018047432A (ja) * 2016-09-23 2018-03-29 旭サナック株式会社 塗装制御装置及び塗装装置

Also Published As

Publication number Publication date
JPH1157539A (ja) 1999-03-02
CA2245315A1 (en) 1999-02-21

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