JP3379623B2 - Rotary atomizing head type electrostatic coating equipment - Google Patents

Rotary atomizing head type electrostatic coating equipment

Info

Publication number
JP3379623B2
JP3379623B2 JP32918796A JP32918796A JP3379623B2 JP 3379623 B2 JP3379623 B2 JP 3379623B2 JP 32918796 A JP32918796 A JP 32918796A JP 32918796 A JP32918796 A JP 32918796A JP 3379623 B2 JP3379623 B2 JP 3379623B2
Authority
JP
Japan
Prior art keywords
atomizing head
rotary atomizing
rotary
paint
high voltage
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 - Fee Related
Application number
JP32918796A
Other languages
Japanese (ja)
Other versions
JPH10151377A (en
Inventor
公好 永井
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.)
ABB KK
Original Assignee
ABB KK
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Filing date
Publication date
Application filed by ABB KK filed Critical ABB KK
Priority to JP32918796A priority Critical patent/JP3379623B2/en
Publication of JPH10151377A publication Critical patent/JPH10151377A/en
Application granted granted Critical
Publication of JP3379623B2 publication Critical patent/JP3379623B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
    • B05B3/1064—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces the liquid or other fluent material to be sprayed being axially supplied to the rotating member through a hollow rotating shaft

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、例えば自動車の車
体等を塗装するのに用いて好適な回転霧化頭型静電塗装
装置に関し、特に、塗料に高電圧を直接印加する直接帯
電方式の回転霧化頭型静電塗装装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary atomizing head type electrostatic coating apparatus suitable for coating, for example, a car body of an automobile, and more particularly to a direct charging system for directly applying a high voltage to the coating material. The present invention relates to a rotary atomizing head type electrostatic coating device.

【０００２】[0002]

【従来の技術】一般に、塗装機本体と、ベル形または筒
状をなし後部側が該塗装機本体の回転軸に取付けられ前
端側が前記塗装機本体から供給された塗料を放出する塗
料放出端縁となった回転霧化頭と、該回転霧化頭に前記
回転軸を介して高電圧を印加する高電圧発生手段とから
なる直接帯電方式の回転霧化頭型静電塗装装置は知られ
ている。2. Description of the Related Art Generally, a main body of a coating machine and a paint-discharging edge which is bell-shaped or cylindrical and whose rear side is attached to a rotary shaft of the main body of the coating machine and whose front end side discharges the paint supplied from the main body of the coating machine. There is known a direct charging type rotary atomizing head type electrostatic coating device comprising a rotary atomizing head and a high voltage generating means for applying a high voltage to the rotary atomizing head through the rotary shaft. .

【０００３】また、このような従来技術による静電塗装
装置は、回転霧化頭が金属により形成されているのが一
般的である。そして、塗装時には、高電圧発生手段から
出力された高電圧が回転霧化頭に印加されることによ
り、回転霧化頭から噴霧される塗料粒子を帯電させる。
また、回転霧化頭に高電圧が印加されることにより、回
転霧化頭と被塗物との間に静電界が形成される。これに
より、回転霧化頭の塗料放出端縁から噴霧された帯電塗
料粒子は、静電力により被塗物に塗着する。In such an electrostatic coating apparatus according to the conventional technique, the rotary atomizing head is generally made of metal. At the time of coating, the high voltage output from the high voltage generating means is applied to the rotary atomizing head to charge the paint particles sprayed from the rotary atomizing head.
Further, by applying a high voltage to the rotary atomizing head, an electrostatic field is formed between the rotary atomizing head and the object to be coated. As a result, the charged paint particles sprayed from the paint discharge edge of the rotary atomizing head are applied to the object by electrostatic force.

【０００４】しかし、前記静電塗装装置では、回転霧化
頭が金属により形成されている。このため、塗装時に、
回転霧化頭と被塗物が異常接近または接触すると、高電
圧発生手段から回転霧化頭に印加されている高電圧によ
って生じる過電流が、被塗物に向けて瞬時に放電し、回
転霧化頭と被塗物との間で火花放電が生じる。この結
果、この放電エネルギによって塗料や有機溶剤が発火す
るといった事故が発生するおそれがある。However, in the electrostatic coating apparatus, the rotary atomizing head is made of metal. Therefore, when painting,
When the rotary atomizing head and the object to be coated approach or come into contact abnormally, the overcurrent generated by the high voltage applied to the rotary atomizing head from the high-voltage generating means instantly discharges toward the object to be coated, and the rotary mist A spark discharge occurs between the head and the object to be coated. As a result, the discharge energy may cause an accident such as ignition of the paint or the organic solvent.

【０００５】このような事故を未然に防止するために、
従来技術による静電塗装装置には、回転霧化頭と被塗物
が異常接近または接触したときに生じる過電流を検出
し、この過電流を検出したときに、高電圧発生手段から
回転霧化頭に高電圧を印加するのを緊急停止する安全回
路が設けられている。しかし、前記安全回路が故障した
ときなどには、回転霧化頭と被塗物との間で火花放電が
生じるおそれがあり、さらなる安全対策を考慮する必要
がある。また、前記安全回路が正常に作動しても、塗装
機本体が有する浮遊容量により塗装機本体内に貯えられ
た電荷が、被塗物に向けて瞬時に放電し、発火事故を誘
発するおそれがある。In order to prevent such an accident,
In the electrostatic coating device according to the conventional technology, an overcurrent generated when the rotary atomizing head and the object to be coated approach or come into abnormal contact is detected, and when this overcurrent is detected, the high voltage generating means performs rotary atomization. A safety circuit is provided to emergency stop the application of high voltage to the head. However, when the safety circuit fails, a spark discharge may occur between the rotary atomizing head and the object to be coated, and it is necessary to consider further safety measures. Even if the safety circuit operates normally, the electric charge stored in the coating machine main body due to the stray capacitance of the coating machine main body may be instantly discharged toward the object to be coated, which may cause an ignition accident. is there.

【０００６】そこで、回転霧化頭を絶縁性樹脂材料によ
り形成し、該回転霧化頭の外周面に半導電性膜を設ける
構成とした静電塗装装置が知られている（特開平８−１
５０３５２号公報等参照）。Therefore, an electrostatic coating apparatus is known in which the rotary atomizing head is formed of an insulating resin material and a semiconductive film is provided on the outer peripheral surface of the rotary atomizing head (Japanese Patent Laid-Open No. 8- 1
50352, etc.).

【０００７】ここで、このような他の従来技術による静
電塗装装置に設けられた樹脂性の回転霧化頭を図１３、
図１４に基づいて説明する。１は塗装機本体（図示せ
ず）の回転軸２に取付けられた回転霧化頭で、該回転霧
化頭１は、霧化頭本体３とハブ部材４とから構成され、
霧化頭本体３とハブ部材４は共に絶縁性樹脂材料により
形成されている。そして、霧化頭本体３の前端側が塗料
放出端縁３Ａとなっている。Here, a resinous rotary atomizing head provided in such an electrostatic coating apparatus according to another conventional technique is shown in FIG.
This will be described with reference to FIG. Reference numeral 1 denotes a rotary atomizing head attached to a rotary shaft 2 of a coating machine body (not shown). The rotary atomizing head 1 includes an atomizing head body 3 and a hub member 4,
Both the atomizing head body 3 and the hub member 4 are made of an insulating resin material. The front end side of the atomizing head main body 3 is the paint discharge edge 3A.

【０００８】５は霧化頭本体３の外周面３Ｂ上に設けら
れた半導電性膜であり、該半導電性膜５は、霧化頭本体
３の外周面３Ｂ上に、導電性材料を混練した絶縁性樹脂
材料を塗布することにより形成されている。そして、該
半導電性膜５は、霧化頭本体の後端面３Ｃで回転軸２の
外周面に当接している。また、半導電性膜５は、霧化頭
本体３の外周面３Ｂ上で、全面的に均一な所定の厚さと
なるように塗布されており、これにより、半導電性膜５
の抵抗値が、全体的にみて１０7 Ω〜１０9 Ω程度に設
定されている。Reference numeral 5 denotes a semi-conductive film provided on the outer peripheral surface 3B of the atomizing head main body 3. The semi-conductive film 5 has a conductive material on the outer peripheral surface 3B of the atomizing head main body 3. It is formed by applying a kneaded insulating resin material. The semiconductive film 5 is in contact with the outer peripheral surface of the rotary shaft 2 at the rear end surface 3C of the atomizing head main body. Further, the semiconductive film 5 is applied on the outer peripheral surface 3B of the atomizing head main body 3 so as to have a uniform thickness over the entire surface, whereby the semiconductive film 5 is formed.
Resistance value is set to about 10 7 Ω to 10 9 Ω as a whole.

【０００９】このように構成される他の従来技術による
静電塗装装置では、塗装時に、高電圧発生手段から回転
軸２を介して回転霧化頭１の半導電性膜５に高電圧を印
加する。これにより、回転霧化頭１の塗料放出端縁３Ａ
から放出される塗料粒子を帯電させると共に、回転霧化
頭１の塗料放出端縁３Ａと被塗物との間に静電界を形成
することができる。In the electrostatic coating apparatus according to the other prior art constructed as described above, a high voltage is applied from the high voltage generating means to the semi-conductive film 5 of the rotary atomizing head 1 through the rotary shaft 2 during coating. To do. As a result, the paint discharge edge 3A of the rotary atomizing head 1
It is possible to charge the paint particles discharged from the device and to form an electrostatic field between the paint discharge edge 3A of the rotary atomizing head 1 and the object to be coated.

【００１０】また、半導電性膜５の抵抗値を１０7 Ω〜
１０9 Ω程度に高く設定することにより、塗装時に回転
霧化頭１と被塗物が異常接近または接触したときに、回
転霧化頭１と被塗物との間に火花放電が生じるのを防止
することができる。Further, the resistance value of the semiconductive film 5 is 10 7 Ω
By setting it to about 10 9 Ω, it is possible to prevent spark discharge from occurring between the rotary atomizing head 1 and the object to be coated when the rotary atomizing head 1 and the object to be coated approach or come into contact abnormally during painting. Can be prevented.

【００１１】[0011]

【発明が解決しようとする課題】ところで、上述した他
の従来技術による静電塗装装置では、霧化頭本体３の外
周面３Ｂ上に、半導電性膜５を均一の厚さに塗布するこ
とは難しく、製造上のばらつき等により、半導電性膜５
が部分的に薄く形成され、半導電性膜５の抵抗値が部分
的に低くくなる場合がある。By the way, in the electrostatic coating apparatus according to the other prior art described above, the semiconductive film 5 is applied to the outer peripheral surface 3B of the atomizing head main body 3 in a uniform thickness. Is difficult, and due to manufacturing variations, etc., the semi-conductive film 5
May be partially thinned and the resistance value of the semiconductive film 5 may be partially reduced.

【００１２】また、半導電性膜５は絶縁材料に導電性材
料を混練することにより形成されているが、この絶縁性
樹脂材料に混練された導電性材料の分散が不均一とな
り、半導電性膜５の抵抗値が部分的に低くくなる場合が
ある。Further, the semiconductive film 5 is formed by kneading the conductive material with the insulating material. However, the conductive material kneaded with the insulating resin material is not evenly dispersed, so that the semiconductive film is not conductive. The resistance value of the film 5 may be partially lowered.

【００１３】ここで、半導電性膜５は、霧化頭本体３の
外周面３Ｂ全面に亘って塗布される、いわゆるベタ塗り
である。従って、該半導電性膜５によって回転霧化頭１
に形成される抵抗は、等価的に考えると図１４に示すよ
うになる。即ち、回転霧化頭１は、霧化頭本体３の後端
面３Ｃから塗料放出端縁３Ａまでの間に、均一に分布し
た多数の抵抗６Ａ，６Ｂ，…，６Ｎが並列的に接続され
ているものと考えることができる。Here, the semiconductive film 5 is a so-called solid coating applied over the entire outer peripheral surface 3B of the atomizing head main body 3. Therefore, the rotary atomizing head 1 is formed by the semiconductive film 5.
The resistance formed in the area is as shown in FIG. That is, in the rotary atomizing head 1, a large number of uniformly distributed resistors 6A, 6B, ..., 6N are connected in parallel between the rear end surface 3C of the atomizing head main body 3 and the paint discharge edge 3A. Can be considered as being.

【００１４】この結果、半導電性膜５が部分的に薄く形
成された場合、または、半導電性膜５中の導電性材料の
分散が不均一の場合には、各抵抗６Ａ，６Ｂ，…，６Ｎ
のうちの一部の抵抗、例えば抵抗６Ｂの抵抗値だけが低
くなるものと考えることができる。このため、回転霧化
頭１に高電圧が印加されたときには、図１４中の矢示に
示すように、抵抗６Ｂに集中的に電流が流れるようにな
る。As a result, when the semiconductive film 5 is partially thinned, or when the conductive material in the semiconductive film 5 is unevenly distributed, the resistors 6A, 6B, ... , 6N
It can be considered that only some of the resistors, for example, the resistance value of the resistor 6B becomes low. Therefore, when a high voltage is applied to the rotary atomizing head 1, as shown by the arrow in FIG. 14, a current flows intensively through the resistor 6B.

【００１５】従って、このように半導電性膜５の抵抗値
が部分的に低い回転霧化頭１を使用した静電塗装装置に
よって塗装を行っている状態で、該回転霧化頭１と被塗
物が異常接近または接触すると、高電圧発生手段（図示
せず）から半導電性膜５に印加された高電圧によって生
じる過電流が、半導電性膜５の抵抗値が低い部分（抵抗
６Ｂ）を通過して、被塗物に向けて瞬時に放電される。
この結果、回転霧化頭１と被塗物との間で火花放電が生
じるおそれがあるという問題がある。Therefore, in a state in which coating is performed by the electrostatic coating apparatus using the rotary atomizing head 1 in which the resistance value of the semiconductive film 5 is partially low, the rotary atomizing head 1 and the object to be coated are coated. When the coating material approaches or contacts abnormally, an overcurrent generated by a high voltage applied to the semiconductive film 5 from a high voltage generating means (not shown) causes a portion where the resistance value of the semiconductive film 5 is low (resistor 6B). ) And is instantly discharged toward the object to be coated.
As a result, there is a problem that spark discharge may occur between the rotary atomizing head 1 and the object to be coated.

【００１６】また、上述した他の従来技術では、図１４
に示すように、霧化頭本体３の後端面３Ｃから塗料放出
端縁３Ａまでの間の距離ａが沿面距離となり、この沿面
距離ａは短い。この結果、半導電性膜５に高電圧を印加
すると、絶縁破壊が生じ易く、沿面放電が生じる可能性
が高いという問題がある。Further, in the above-mentioned other prior art, FIG.
As shown in, the distance a between the rear end surface 3C of the atomizing head body 3 and the paint discharge edge 3A is the creepage distance, and this creepage distance a is short. As a result, when a high voltage is applied to the semiconductive film 5, there is a problem that dielectric breakdown is likely to occur and a creeping discharge is likely to occur.

【００１７】本発明は上述した従来技術の問題に鑑みな
されたもので、塗装時に、回転霧化頭と被塗物が異常接
近または接触したとき、回転霧化頭と被塗物との間に火
花放電が生じるのを防止でき、安全性を高めることがで
きるようにした回転霧化頭型静電塗装装置を提供するこ
とを目的としている。The present invention has been made in view of the above-mentioned problems of the prior art, and when the rotary atomizing head and the article to be coated come into abnormal proximity or come into contact with each other during coating, the rotary atomizing head and the article to be coated are provided. An object of the present invention is to provide a rotary atomizing head type electrostatic coating device capable of preventing spark discharge from occurring and improving safety.

【００１８】[0018]

【課題を解決するための手段】上述した課題を解決する
ために、本発明の回転霧化頭型静電塗装装置は、回転軸
を駆動するためのエアモータと、ベル形または筒状をな
し後部側が回転軸に取付けられ前端側が前記塗装機本体
から供給された塗料を塗料粒子として噴霧する塗料放出
端縁となった回転霧化頭と、該回転霧化頭の放出端縁か
ら噴霧される塗料に高電圧を帯電すべく該回転霧化頭に
前記回転軸を介して高電圧を印加する高電圧発生手段と
から構成されている。In order to solve the above-mentioned problems, the rotary atomizing head type electrostatic coating apparatus of the present invention comprises an air motor for driving a rotary shaft and a bell-shaped or cylindrical rear portion. A rotary atomizing head whose side is attached to a rotary shaft and whose front end side is a paint discharge edge for spraying the paint supplied from the main body of the coating machine as paint particles, and a discharge edge of the rotary atomizing head.
It is composed of high voltage generating means for applying a high voltage to the rotary atomizing head through the rotary shaft so as to charge the sprayed paint with a high voltage .

【００１９】そして、請求項１に係る発明の特徴は、回
転霧化頭を絶縁性樹脂材料により形成し、該回転霧化頭
には、該回転霧化頭の後部側から塗料放出端縁に向けて
該回転霧化頭の外周側を周回しつつ伸長する螺旋状半導
電体を設け、前記回転霧化頭の後端部には一端側が前記
回転軸の外周面に近接または当接する受電電極を設け、
前記回転霧化頭の塗料放出端縁には該塗料放出端縁に沿
って環状に伸長し導電性材料または半導電性材料からな
る帯電電極を設け、前記螺旋状半導電体の後端側を前記
受電電極に接続し前記螺旋状半導電体の前端側を前記帯
電電極に接続し、高電圧発生手段から回転軸を介して該
螺旋状半導電体の後端部の受電電極に印加される高電圧
を、当該螺旋状半導電体の前端部から前記帯電電極に供
給する構成としたことにある。The invention according to claim 1 is characterized in that the rotary atomizing head is formed of an insulating resin material, and the rotary atomizing head is provided with a paint discharge edge from the rear side of the rotary atomizing head. A spiral semi-conductor extending around the outer peripheral side of the rotary atomizing head is provided, and one end side is provided at the rear end of the rotary atomizing head.
Provided with a power receiving electrode that is close to or in contact with the outer peripheral surface of the rotating shaft,
The paint discharge edge of the rotary atomizing head is aligned with the paint discharge edge.
Ring-shaped and made of a conductive or semi-conductive material.
A charging electrode is provided, and the rear end side of the spiral semi-conductor is
The front end side of the spiral semi-conductor is connected to the power receiving electrode
A high voltage applied to the power receiving electrode at the rear end of the spiral semiconductive body from the high voltage generating means via the rotating shaft from the front end of the spiral semiconductive body to the charging electrode. It is configured to supply to.

【００２０】このように構成したことにより、塗装時に
は、エアモータによって回転霧化頭を高速回転する。こ
の状態で、高電圧発生手段から回転霧化頭の後部側に位
置する螺旋状半導電体の後端側に高電圧を供給すると、
これによって生じる電流は、螺旋状半導電体に沿って、
回転霧化頭の後部側から塗料放出端縁に向けて回転霧化
頭の外周側を周回するようにして流れる。これにより、
回転霧化頭の塗料放出端縁に高電圧が供給され、この高
電圧は、回転霧化頭の塗料放出端縁から放出される塗料
に帯電すると共に、回転霧化頭の塗料放出端縁と被塗物
との間に静電界を形成する。With this configuration, the rotary atomizing head is rotated at high speed by the air motor during coating. In this state, when a high voltage is supplied from the high voltage generating means to the rear end side of the spiral semi-conductor located on the rear side of the rotary atomizing head,
The current produced by this is along the spiral semi-conductor,
It flows from the rear side of the rotary atomizing head toward the paint discharge edge so as to go around the outer peripheral side of the rotary atomizing head. This allows
A high voltage is supplied to the paint discharge edge of the rotary atomizing head, and this high voltage charges the paint discharged from the paint discharge edge of the rotary atomizing head, and also to the paint discharge edge of the rotary atomizing head. An electrostatic field is formed between the object and the object to be coated.

【００２１】また、螺旋状半導電体は、回転霧化頭の後
端側から塗料放出端縁に向けて回転霧化頭の外周側を周
回しつつ螺旋状に伸長している。このため、回転霧化頭
の後端側に位置する螺旋状半導電体の後端から、回転霧
化頭の塗料放出端縁に位置する螺旋状半導電体の前端ま
での長さ寸法が非常に長い。これにより、螺旋状半導電
体の全体的な抵抗値、即ち、螺旋状半導電体の後端から
前端までの間の抵抗値は、主として螺旋状半導電体の後
端から前端までの間の長さ寸法によって決定される。従
って、螺旋状半導電体を、回転霧化頭の外周側に巻回し
て設けることにより、螺旋状半導電体を高抵抗値とする
ことができる。Further, the spiral semi-conductor extends spirally from the rear end side of the rotary atomizing head toward the paint discharge edge while wrapping around the outer peripheral side of the rotary atomizing head. Therefore, the length from the rear end of the spiral semi-conductor located on the rear end side of the rotary atomizing head to the front end of the spiral semi-conductor located on the paint discharge edge of the rotary atomizing head is extremely small. Long. As a result, the overall resistance value of the spiral semiconductor, that is, the resistance value between the rear end and the front end of the spiral semiconductor is mainly between the rear end and the front end of the spiral semiconductor. Determined by the length dimension. Therefore, by winding the spiral semi-conductor around the outer circumference of the rotary atomizing head, the spiral semi-conductor can have a high resistance value.

【００２２】これにより、塗装時に、回転霧化頭と被塗
物が異常接近または接触したとき、高電圧発生手段から
螺旋状半導電体に印加された高電圧が被塗物に向けて流
れる過電流を、螺旋状半導電体の高抵抗により抑制する
ことができる。Thus, when the rotary atomizing head and the article to be coated come into abnormal contact or come into contact with each other during coating, the high voltage applied from the high voltage generating means to the spiral semi-conductor flows toward the article to be coated. The current can be suppressed by the high resistance of the spiral semiconductor.

【００２３】さらに、螺旋状半導電体の全体的な抵抗値
は、主として螺旋状半導電体の後端から前端までの長さ
寸法（巻回数）によって決定される。従って、螺旋状半
導電体の部分的な厚さの不均一や、螺旋状半導電体中に
混練された導電性材料の不均一等が生じていても、螺旋
状半導体の全体的な抵抗値を一定に保つことができる。
また、螺旋状半導電体の後端から前端までの長さ寸法を
長くすることにより、単位長さ当りの抵抗値を低くでき
る。また、回転霧化頭の後端側に受電電極を設け、回転
霧化頭の塗料放出端縁に帯電電極を設け、螺旋状半導電
体を受電電極と帯電電極に接続する構成としたから、塗
装時に、高電圧発生手段から回転軸に高電圧を印加する
と、この高電圧は、回転軸から受電電極に印加され、該
受電電極から螺旋状半導電体を介して帯電電極に供給さ
れる。従って、帯電電極によって、回転霧化頭の塗料放
出端縁から放出される塗料を帯電することができると共
に、回転霧化頭の塗料放出端縁と被塗物との間に静電界
を形成することができる。 Further, the overall resistance value of the spiral semi-conductor is mainly determined by the length dimension (number of turns) from the rear end to the front end of the spiral semi-conductor. Therefore, even if the partial thickness of the spiral semi-conductor is uneven, or the conductive material mixed in the spiral semi-conductor is non-uniform, the overall resistance value of the spiral semiconductor is reduced. Can be kept constant.
Also, by increasing the length dimension from the rear end to the front end of the spiral semi-conductor, the resistance value per unit length can be lowered. In addition, a power receiving electrode is provided on the rear end side of the rotary atomizing head to rotate
Equipped with a charging electrode on the paint discharge edge of the atomizing head, spiral semi-conducting
Since the body is connected to the power receiving electrode and the charging electrode,
Applying a high voltage from the high voltage generator to the rotating shaft during mounting
And this high voltage is applied to the power receiving electrode from the rotating shaft,
Supplied from the power receiving electrode to the charging electrode via the spiral semi-conductor.
Be done. Therefore, the charged electrode can discharge the paint from the rotary atomizing head.
In addition to being able to charge the paint released from the leading edge,
In addition, an electrostatic field is generated between the paint discharge edge of the rotary atomizing head and the object to be coated.
Can be formed.

【００２４】[0024]

【００２５】[0025]

【００２６】[0026]

【００２７】[0027]

【００２８】[0028]

【００２９】[0029]

【００３０】[0030]

【００３１】[0031]

【００３２】請求項２に係る発明の特徴は、回転霧化頭
を絶縁性樹脂材料により形成し、該回転霧化頭には、該
回転霧化頭の後部側から塗料放出端縁に向けて該回転霧
化頭の外周側を周回しつつ伸長する螺旋状半導電体を設
け、回転霧化頭の前端部に導電性材料または半導電性材
料からなる導電性リングを設け、該導電性リングの前端
縁を塗料放出端縁とし、高電圧発生手段から回転軸を介
して該螺旋状半導電体の後端部に印加される高電圧を、
当該螺旋状半導電体の前端部から塗料放出端縁をなす導
電性リングに供給する構成としたことにある。これによ
り、塗料放出端縁の強度を高めることができる。ここ
で、導電性リングは、例えば、金属、導電性樹脂、導電
性材料を混練した樹脂等により構成されたリングであ
る。 A feature of the invention according to claim 2 is that the rotary atomizing head is used.
Is formed of an insulating resin material, and the rotary atomizing head is
From the rear side of the rotary atomizing head toward the paint discharge edge
A spiral semi-conductor that extends while encircling the outer peripheral side of the chemical head is installed.
, Conductive or semi-conductive material on the front end of the rotary atomizing head
A conductive ring made of a material is provided, and the front edge of the conductive ring is used as a paint discharge edge, and the high voltage generating means intervenes a rotating shaft.
The high voltage applied to the rear end of the spiral semi-conductor,
Conductor forming a paint discharge edge from the front end of the spiral semi-conductor.
It is configured to supply the electric ring . As a result, the strength of the paint discharge edge can be increased. Here, the conductive ring is, for example, a ring made of metal, a conductive resin, a resin obtained by kneading a conductive material, or the like.

【００３３】請求項３に係る発明の特徴は、回転霧化頭
を、絶縁性樹脂材料からなり該回転霧化頭の前端側に向
けて拡開しベル形またはカップ形に形成されたベルカッ
プ部と、絶縁性樹脂材料からなり該ベルカップ部の後部
側に設けられ該回転霧化頭を回転軸に取付ける回転軸取
付部と、絶縁性樹脂材料からなりベルカップ部の外周側
から回転霧化頭の後部側に向けて円筒状に突出し、後端
側に前記回転軸取付部との間に環状空間を形成してなる
円筒部とから構成し、該回転霧化頭には、該回転霧化頭
の後部側から塗料放出端縁に向けて該回転霧化頭の外周
側を周回しつつ伸長し、前記円筒部の外周面と内周面に
ほぼ全面に亘って螺旋状半導電体を設け、高電圧発生手
段から回転軸を介して該螺旋状半導電体の後端部に印加
される高電圧を、当該螺旋状半導電体の前端部から塗料
放出端縁に供給する構成としたことにある。The feature of the invention according to claim 3, the rotary atomizing head, the bell cup formed in the flared bell-shaped or cup-shaped toward the front end side of the rotary atomizing head made of an insulating resin material parts and, rotary atomizing the rotary atomizing head provided at the rear side of the bell cup portion made of an insulating resin material and the rotational shaft mount portion for mounting on the rotary shaft, the outer peripheral side of the bell cup portion made of an insulating resin material The rotary atomizing head includes a cylindrical portion that projects in a cylindrical shape toward the rear side of the head and forms an annular space between the rotary shaft mounting portion and the rear end side. Atomized head
From the rear side toward the paint discharge edge, the outer circumference of the rotary atomizing head
While extending around the side, it extends to the outer peripheral surface and the inner peripheral surface of the cylindrical portion.
Almost spiral semiconducting provided over the entire surface, the high voltage generating hand
Applied from the step to the rear end of the spiral semi-conductor through the rotation axis
Applied high voltage from the front end of the spiral semi-conductor
In that a configuration you supplied to releasing edges.

【００３４】上記構成の如く、ベルカップ部の外周側か
ら回転霧化頭の後部側に向けて突出する円筒部を設ける
ことにより、円筒部の外周面が回転霧化頭の外周面にな
り、円筒部のないベル形またはカップ形の回転霧化頭と
比較して、回転霧化頭の外周面積が大きくなる。これに
より、円筒部の外周側に螺旋状半導電体をより多く巻回
することができ、螺旋状半導電体の長さ寸法を大きくす
ることができる。また、円筒部の内周側等にも螺旋状半
導電体を設けることができるため、螺旋状半導電体の長
さ寸法をより一層大きくすることができる。As described above, by providing the cylindrical portion protruding from the outer peripheral side of the bell cup portion toward the rear side of the rotary atomizing head, the outer peripheral surface of the cylindrical portion becomes the outer peripheral surface of the rotary atomizing head, The outer peripheral area of the rotary atomizing head is larger than that of the bell-shaped or cup-shaped rotary atomizing head having no cylindrical portion. Thereby, the spiral semi-conductor can be wound more on the outer peripheral side of the cylindrical portion, and the length dimension of the spiral semi-conductor can be increased. Further, since the spiral semi-conductor can be provided on the inner peripheral side of the cylindrical portion or the like, the length dimension of the spiral semi-conductor can be further increased.

【００３５】[0035]

【発明の実施の形態】以下、本発明の実施の形態を添付
図面に従って詳述する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

【００３６】ここで、図１ないし図６は本発明の第１の
実施例による回転霧化頭型静電塗装装置を示している。1 to 6 show a rotary atomizing head type electrostatic coating apparatus according to a first embodiment of the present invention.

【００３７】図１中、１１は本実施例による回転霧化頭
型静電塗装装置である。１２は該静電塗装装置１１のカ
バーを示し、該カバー１２は、例えばポリテトラフルオ
ロエチレン（ＰＴＦＥ）、ポリエチレンテレフタレート
（ＰＥＴ）等の絶縁性樹脂材料により円筒状に形成され
ている。In FIG. 1, 11 is a rotary atomizing head type electrostatic coating apparatus according to this embodiment. Reference numeral 12 denotes a cover of the electrostatic coating device 11. The cover 12 is formed in a cylindrical shape from an insulating resin material such as polytetrafluoroethylene (PTFE) or polyethylene terephthalate (PET).

【００３８】１３はカバー１２内に設けられた導電性金
属材料からなるエアモータで、該エアモータ１３は、導
電性金属材料により段付筒状に形成されたモータハウジ
ング１３Ａ、後述する回転軸１４を回転駆動するエアタ
ービン（図示せず）等から構成されている。また、モー
タハウジング１３Ａには、後述する高電圧発生器２５に
よって高電圧が印加される。Reference numeral 13 is an air motor made of a conductive metal material provided in the cover 12. The air motor 13 rotates a motor housing 13A formed of a conductive metal material in a stepped cylinder shape, and a rotary shaft 14 described later. It is composed of a driven air turbine (not shown) and the like. A high voltage is applied to the motor housing 13A by a high voltage generator 25 described later.

【００３９】１４はエアモータ１３の内周側に回転可能
に設けられた回転軸であり、該回転軸１４は、金属材料
により中空筒状に形成されている。また、該回転軸１４
の後端側は、エアモータ１３のエアタービンに固着され
（図示せず）、前端側はエアモータ１３外に突出してい
る。そして、該回転軸１４は、エアモータ１３によって
高速回転する。Reference numeral 14 denotes a rotary shaft rotatably provided on the inner peripheral side of the air motor 13, and the rotary shaft 14 is formed of a metal material in a hollow cylindrical shape. In addition, the rotary shaft 14
The rear end side is fixed to the air turbine of the air motor 13 (not shown), and the front end side projects outside the air motor 13. The rotary shaft 14 is rotated at high speed by the air motor 13.

【００４０】１５は回転軸１４内に同軸に設けられたフ
ィードチューブであり、該フィードチューブ１５は、該
フィードチューブ１５の中心軸上に設けられた塗料チュ
ーブ１５Ａと、該塗料チューブ１５Ａの外周側に位置
し、該塗料チューブ１５Ａと同軸に設けられた溶剤チュ
ーブ１５Ｂとからなる二重筒構造になっている。そし
て、塗料チューブ１５Ａは、塗装時に、塗料源（図示せ
ず）から供給される塗料を、後述する回転霧化頭１８に
供給するものである。Reference numeral 15 is a feed tube coaxially provided in the rotary shaft 14, and the feed tube 15 includes a paint tube 15A provided on the central axis of the feed tube 15 and an outer peripheral side of the paint tube 15A. And a solvent tube 15B provided coaxially with the paint tube 15A has a double cylinder structure. The paint tube 15A supplies paint supplied from a paint source (not shown) to the rotary atomizing head 18 to be described later at the time of coating.

【００４１】また、溶剤チューブ１５Ｂは、色替時等
に、溶剤源（図示せず）から供給されるシンナ等の溶剤
を回転霧化頭１８に供給するものである。即ち、前色塗
料による塗装が終了し、色替を行って次色塗料による塗
装を続行するときには、溶剤チューブ１５Ｂによって回
転霧化頭１８に洗浄用の溶剤を供給し、回転霧化頭１８
の塗料薄膜化面１９Ｄ、ハブ部材２０の前面等に付着し
た前色塗料を洗浄するようにしている。The solvent tube 15B is for supplying a solvent such as thinner supplied from a solvent source (not shown) to the rotary atomizing head 18 when changing colors. That is, when the coating with the previous color paint is completed and the color is changed and the coating with the next color paint is continued, the solvent for cleaning is supplied to the rotary atomizing head 18 by the solvent tube 15B, and the rotary atomizing head 18 is supplied.
The previous color paint attached to the paint thinning surface 19D, the front surface of the hub member 20, etc. is cleaned.

【００４２】１６はカバー１２の前端側に取付けられた
シェーピングエアリングを示し、該シェーピングエアリ
ング１６は、内側リング１６Ａと、該内側リング１６Ａ
の外周側に設けられた外側リング１６Ｂとから構成され
ている。そして、内側リング１６Ａ，外側リング１６Ｂ
はいずれも、カバー１２と同様の絶縁性樹脂材料によっ
て形成されている。また、該シェーピングエアリング１
６の前端側には、環状のシェーピングエア吐出口１６Ｃ
が設けられている。Reference numeral 16 denotes a shaping air ring attached to the front end side of the cover 12. The shaping air ring 16 includes an inner ring 16A and an inner ring 16A.
And an outer ring 16B provided on the outer peripheral side. Then, the inner ring 16A and the outer ring 16B
Both are made of the same insulating resin material as the cover 12. Also, the shaping air ring 1
On the front end side of 6, an annular shaping air discharge port 16C is provided.
Is provided.

【００４３】１７はシェーピングエアを供給するための
シェーピングエア通路を示し、該シェーピングエア通路
１７はカバー１２内に設けられている。そして、シェー
ピングエア通路１７は、その後端側がシェーピングエア
供給源（図示せず）に接続されており、前端側がシェー
ピングエアリング１６のシェーピングエア吐出口１６Ｃ
に接続されている。そして、塗装時等に、シェーピング
エア供給源から圧縮エアが供給されると、この圧縮エア
はシェーピングエア通路１７を通過して、シェーピング
エア吐出口１６Ｃからシェーピングエアとなって吐出さ
れる。そして、このシェーピングエアは、回転霧化頭１
８の外周側を包囲するように円形状に流れ、回転霧化頭
１８の塗料放出端縁１９Ｅから噴霧される塗料の噴霧パ
ターンを成形する。Reference numeral 17 denotes a shaping air passage for supplying shaping air, and the shaping air passage 17 is provided in the cover 12. The shaping air passage 17 is connected at its rear end side to a shaping air supply source (not shown) and at its front end side at the shaping air discharge port 16C of the shaping air ring 16.
It is connected to the. Then, when compressed air is supplied from the shaping air supply source at the time of coating or the like, this compressed air passes through the shaping air passage 17 and is discharged as shaping air from the shaping air discharge port 16C. This shaping air is then used by the rotary atomizing head 1
A spray pattern of the paint that flows in a circular shape so as to surround the outer peripheral side of 8 and is sprayed from the paint discharge edge 19E of the rotary atomizing head 18 is formed.

【００４４】なお、上述したカバー１２、エアモータ１
３、回転軸１４、フィードチューブ１５、シェーピング
エアリング１６、シェーピングエア通路１７等により、
塗装機本体を構成している。The cover 12 and the air motor 1 described above are used.
3, the rotating shaft 14, the feed tube 15, the shaping air ring 16, the shaping air passage 17, etc.
It constitutes the main body of the coating machine.

【００４５】１８は回転軸１４の前端に取付けられた回
転霧化頭で、該回転霧化頭１８は、霧化頭本体１９とハ
ブ部材２０とから大略構成されている。Reference numeral 18 is a rotary atomizing head mounted on the front end of the rotary shaft 14, and the rotary atomizing head 18 is generally composed of an atomizing head main body 19 and a hub member 20.

【００４６】ここで、霧化頭本体１９は、図２に示すよ
うに回転霧化頭１８の外形をなすもので、例えばポリエ
ーテルスルホン（ＰＥＳ），ポリフェニレンサルファイ
ド（ＰＰＳ），ポリエーテルイミド（ＰＥＩ），ポリエ
ーテルエーテルケトン（ＰＥＥＫ），ポリオキシメチレ
ン（ＰＯＭ），ポリアミドイミド（ＰＡＩ），ポリエチ
レンテレフタレート（ＰＥＴ）等の絶縁性樹脂材料によ
り形成されている。Here, the atomizing head main body 19 forms the outer shape of the rotary atomizing head 18 as shown in FIG. 2. For example, polyether sulfone (PES), polyphenylene sulfide (PPS), polyether imide (PEI). ), Polyether ether ketone (PEEK), polyoxymethylene (POM), polyamide imide (PAI), polyethylene terephthalate (PET), and other insulating resin materials.

【００４７】そして、霧化頭本体１９は、該霧化頭本体
１９の前端側に向けて拡開して延びベル形またはカップ
形に形成されたベルカップ部１９Ａと、該ベルカップ部
１９Ａから該霧化頭本体１９の後端側に向けて延びた筒
状の回転軸取付部１９Ｂと、ベルカップ部１９Ａの内周
側に設けられハブ部材２０が取付けられたハブ部材取付
部１９Ｃと、塗料を薄膜化させるために該ハブ部材取付
部１９Ｃからベルカップ部１９Ａの前端側にかけてベル
カップ部１９Ａの内周面に形成された塗料薄膜化面１９
Ｄと、該塗料薄膜化面１９Ｄによって薄膜化された塗料
を液糸として放出する塗料放出端縁１９Ｅとから大略構
成されている。The atomizing head main body 19 has a bell cup portion 19A formed in a bell shape or a cup shape and expanding and expanding toward the front end side of the atomizing head main body 19, and the bell cup portion 19A. A cylindrical rotary shaft mounting portion 19B extending toward the rear end side of the atomizing head main body 19, a hub member mounting portion 19C provided on the inner peripheral side of the bell cup portion 19A and to which a hub member 20 is mounted, A coating film thinning surface 19 formed on the inner peripheral surface of the bell cup portion 19A from the hub member mounting portion 19C to the front end side of the bell cup portion 19A for thinning the coating material.
D and a paint discharge edge 19E for discharging the paint thinned by the paint thinning surface 19D as a liquid thread.

【００４８】さらに、塗料薄膜化面１９Ｄの前端側（塗
料放出端縁１９Ｅの内周面）には、Ｖ字状の細溝１９
Ｆ，１９Ｆ，…が塗料薄膜化面１９Ｄの全周に亘って多
数設けられている。該各細溝１９Ｆは、塗料が塗料放出
端縁１９Ｅから放出されるときに、塗料の微粒子化を容
易ならしめるものである。Further, on the front end side of the paint film thinning surface 19D (inner peripheral surface of the paint discharge edge 19E), a V-shaped narrow groove 19 is formed.
A large number of F, 19F, ... Are provided along the entire circumference of the paint film thinning surface 19D. Each of the narrow grooves 19F facilitates atomization of the paint when the paint is discharged from the paint discharge edge 19E.

【００４９】２０は霧化頭本体１９のハブ部材取付部１
９Ｃに取付けられたハブ部材を示し、ハブ部材２０は霧
化頭本体１９と同様の絶縁性樹脂材料により形成されて
いる。また、ハブ部材２０の外周側には、塗料チューブ
１５Ａから供給された塗料または溶剤チューブ１５Ｂか
ら供給された溶剤を塗料薄膜化面１９Ｄに導くための第
１のハブ孔２０Ａ，２０Ａ，…が多数個穿設され、ハブ
部材２０の中央側には、ハブ部材２０の前面に溶剤を供
給するための第２のハブ孔２０Ｂ，２０Ｂ，…が複数個
穿設されている。Reference numeral 20 denotes a hub member mounting portion 1 of the atomizing head main body 19.
9C shows a hub member attached to the hub 9C, and the hub member 20 is made of the same insulating resin material as that of the atomizing head main body 19. Further, on the outer peripheral side of the hub member 20, there are many first hub holes 20A, 20A, ... For guiding the paint supplied from the paint tube 15A or the solvent supplied from the solvent tube 15B to the paint thinning surface 19D. A plurality of second hub holes 20B, 20B, ... For supplying a solvent to the front surface of the hub member 20 are provided in the center of the hub member 20.

【００５０】２１は霧化頭本体１９の後端部に設けられ
た受電電極を示し、該受電電極２１は、ほぼ円環状に形
成され、回転霧化頭本体１９の外周面１９Ｇの後部位置
から後端面１９Ｈにかけてを覆っている。さらに、該受
電電極２１の内周側端部２１Ａは、図４に示すように、
回転軸１４の外周面に当接している。Reference numeral 21 denotes a power receiving electrode provided at the rear end portion of the atomizing head main body 19. The power receiving electrode 21 is formed in a substantially annular shape, and is located from the rear position of the outer peripheral surface 19G of the rotary atomizing head main body 19. It covers over the rear end surface 19H. Further, as shown in FIG. 4, the inner peripheral end 21A of the power receiving electrode 21 is
It contacts the outer peripheral surface of the rotating shaft 14.

【００５１】ここで、前記受電電極２１は、例えば、ポ
リエステル，エポキシ，フッ素樹脂等の絶縁性樹脂材料
に導電性材料を混練することにより生成された半導電性
材料が用いられている。そして、該受電電極２１は、こ
の半導電性材料を霧化頭本体１９の外周面１９Ｇの後部
位置から後端面１９Ｈに塗着することにより設けられて
いる。そして、該受電電極２１は、抵抗値が１ｃｍ2あ
たり１０2 Ω〜１０7Ω程度となるように、その厚さ寸
法等が設定されている。Here, the power receiving electrode 21 is made of, for example, a semi-conductive material produced by kneading a conductive material with an insulating resin material such as polyester, epoxy, or fluororesin. The power receiving electrode 21 is provided by applying the semiconductive material from the rear position of the outer peripheral surface 19G of the atomizing head main body 19 to the rear end surface 19H. The thickness and the like of the power receiving electrode 21 are set so that the resistance value is about 10 2 Ω to 10 7 Ω per cm 2 .

【００５２】なお、該受電電極２１を、霧化頭本体１９
の後端部に金属材料を張りつけることにより、または、
金属メッキ等を蒸着することによって設ける構成として
もよい。The power receiving electrode 21 is connected to the atomizing head main body 19
By sticking a metal material to the rear end of the
It may be provided by vapor deposition of metal plating or the like.

【００５３】２２は霧化頭本体１９の外周面１９Ｇ上に
設けられた螺旋状半導電体を示し、該螺旋状半導電体２
２は、霧化頭本体１９の後端側から前端側（塗料放出端
縁１９Ｅ）に向けて霧化頭本体１９の外周側を周回しつ
つ伸長している。即ち、該螺旋状半導電体２２は、図３
に示すように、線状または帯状の１本の半導電性材料
を、霧化頭本体１９の外周側に螺旋状に巻回するように
して設けられている。そして、該螺旋状半導電体２２の
後端部２２Ａは、図４に示すように受電電極２１に接続
され、該螺旋状半導電体２２の前端部２２Ｂは、図５に
示すように後述する帯電電極２３に接続されている。Reference numeral 22 denotes a spiral semi-conductor provided on the outer peripheral surface 19G of the atomizing head main body 19, and the spiral semi-conductor 2
The reference numeral 2 extends from the rear end side of the atomizing head main body 19 toward the front end side (paint discharge edge 19E) while wrapping around the outer peripheral side of the atomizing head main body 19. That is, the spiral semi-conductor 22 is shown in FIG.
As shown in (1), one linear or strip-shaped semiconductive material is spirally wound around the outer peripheral side of the atomizing head main body 19. The rear end 22A of the spiral semi-conductor 22 is connected to the power receiving electrode 21 as shown in FIG. 4, and the front end 22B of the spiral semi-conductor 22 will be described later as shown in FIG. It is connected to the charging electrode 23.

【００５４】また、該螺旋状半導電体２２は、例えば、
ポリエステル，エポキシ，フッ素樹脂等の絶縁性樹脂材
料に導電性材料を混練することにより生成された半導電
性材料により形成されている。そして、該螺旋状半導電
体２２は、この半導電性材料を霧化頭本体１９の外周面
１９Ｇ全面に塗布した後、この塗布した半導電性材料
を、霧化頭本体１９の後端側から前端側に向け、連続し
た螺旋状の筋道を残すように、切削することによって形
成されている。Further, the spiral semi-conductor 22 is, for example,
It is made of a semiconductive material produced by kneading an electrically conductive material with an insulating resin material such as polyester, epoxy, or fluororesin. The spiral semiconductive body 22 is formed by applying the semiconductive material to the entire outer peripheral surface 19G of the atomizing head body 19 and then applying the applied semiconductive material to the rear end side of the atomizing head body 19. Is formed by cutting so as to leave a continuous spiral muscle path from the front to the front end side.

【００５５】さらに、該螺旋状半導電体２２は、その後
端部２２Ａから前端部２２Ｂまでの間の抵抗値（螺旋状
半導電体２２の全体抵抗値）が１０7 Ω〜１０9 Ω程
度、好ましくは１×１０8 Ω〜３×１０8 Ω程度となる
ように設定されている。ここで、螺旋状半導電体２２の
後端部２２Ａから前端部２２Ｂまでの長さ寸法は、螺旋
状半導電体２２の厚さ寸法、幅寸法と比較して非常に大
きいため、螺旋状半導電体２２の全体抵抗値は、実質的
に螺旋状半導電体２２の後端部２２Ａから前端部２２Ｂ
までの長さ寸法、即ち、螺旋状半導電体２２の巻回数に
よって決定される。例えば、螺旋状半導電体２２の全体
抵抗値を１０7 Ω〜１０9 Ω程度に設定するには、螺旋
状半導電体２２を霧化頭本体１９の外周側に５回〜１０
００回程度巻回する。Further, the spiral semi-conductor 22 has a resistance value (entire resistance value of the spiral semi-conductor 22) between its rear end 22A and front end 22B of about 10 7 Ω to 10 9 Ω. It is preferably set to about 1 × 10 8 Ω to 3 × 10 8 Ω. Here, since the length dimension from the rear end portion 22A to the front end portion 22B of the spiral semi-conductor 22 is much larger than the thickness dimension and the width dimension of the spiral semi-conductor 22, the spiral semi-conductor 22 The overall resistance of the conductor 22 is substantially from the rear end 22A of the spiral semi-conductor 22 to the front end 22B.
Up to the length, that is, the number of turns of the spiral semi-conductor 22. For example, in order to set the total resistance value of the spiral semiconductive body 22 to about 10 7 Ω to 10 9 Ω, the spiral semiconductive body 22 is moved to the outer peripheral side of the atomizing head main body 19 5 times to 10 times.
Wind around 00 times.

【００５６】２３は霧化頭本体１９の前端側に位置し、
該霧化頭本体１９の外周面１９Ｇ上に設けられた帯電電
極を示し、該帯電電極２３は、霧化頭本体１９の外周面
１９Ｇを全周に亘って伸長する環状の電極であり、該帯
電電極２３の前端部２３Ａは、図５に示すように、霧化
頭本体１９の塗料放出端縁１９Ｅと実質的に同一の位置
に配置されている。これにより、帯電電極２３は、霧化
頭本体１９の細溝１９Ｆから放出されようとする塗料に
対し、直接帯電させることができる。23 is located on the front end side of the atomizing head main body 19,
The charging electrode provided on the outer peripheral surface 19G of the atomizing head main body 19 is shown, and the charging electrode 23 is an annular electrode extending over the entire outer peripheral surface 19G of the atomizing head main body 19, As shown in FIG. 5, the front end portion 23A of the charging electrode 23 is arranged at substantially the same position as the paint discharge edge 19E of the atomizing head main body 19. As a result, the charging electrode 23 can directly charge the paint that is about to be discharged from the narrow groove 19F of the atomizing head body 19.

【００５７】また、該帯電電極２３は、受電電極２１と
同様に、半導電性材料を霧化頭本体１９の外周面１９Ｇ
に塗着することにより設けられている。そして、該帯電
電極２３は、抵抗値が１ｃｍ2あたり１０2 Ω〜１０7
Ω程度となるように、その厚さ寸法等が設定されてい
る。Further, the charging electrode 23, like the power receiving electrode 21, is made of a semiconductive material, and the outer peripheral surface 19G of the atomizing head main body 19 is made.
It is provided by coating. The charging electrode 23 has a resistance value of 10 2 Ω to 10 7 per cm 2.
The thickness and the like are set so as to be about Ω.

【００５８】なお、該帯電電極２３を、霧化頭本体１９
の前端側に位置する外周面１９Ｇに金属材料を張りつけ
ることによって、または、金属メッキ等を蒸着すること
によって設ける構成としてもよい。The charging electrode 23 is replaced with the atomizing head main body 19
The outer peripheral surface 19G located on the front end side may be provided with a metal material, or may be provided by depositing metal plating or the like.

【００５９】２４は霧化頭本体１９の外周側に設けられ
た絶縁被膜を示し、該絶縁被膜２４は、図２に示すよう
に、受電電極２１、螺旋状半導電体２２、帯電電極２３
を外周側から覆うように、霧化頭本体１９の外周面１９
Ｇ，後端面１９Ｈ上に設けられている。Reference numeral 24 denotes an insulating coating provided on the outer peripheral side of the atomizing head main body 19, and the insulating coating 24 is, as shown in FIG. 2, the power receiving electrode 21, the spiral semi-conductor 22, and the charging electrode 23.
The outer peripheral surface 19 of the atomizing head main body 19 so as to cover the outer peripheral side.
G, provided on the rear end surface 19H.

【００６０】２５は高電圧発生手段としての高電圧発生
器を示し、該高電圧発生器２５は、多倍圧回路、安全回
路等（いずれも図示せず）により構成され、エアモータ
１３のモータハウジング１３Ａ、回転軸１４を介して霧
化頭本体１９に設けられた受電電極２１に高電圧を印加
するものである。Reference numeral 25 denotes a high voltage generator as high voltage generating means. The high voltage generator 25 is composed of a multiple voltage circuit, a safety circuit, etc. (neither is shown), and is a motor housing of the air motor 13. A high voltage is applied to the power receiving electrode 21 provided on the atomizing head main body 19 via 13A and the rotating shaft 14.

【００６１】本実施例による回転霧化頭型静電塗装装置
１１は上述したような構成を有するもので、次に、その
動作について説明する。The rotary atomizing head type electrostatic coating device 11 according to the present embodiment has the above-mentioned structure, and its operation will be described below.

【００６２】車体等の被塗物に塗装を行うときには、エ
アモータ１３を駆動し、回転軸１４、回転霧化頭１８を
高速回転させる。そして、高電圧発生器２５により高電
圧を発生させ、この高電圧を、エアモータ１３のモータ
ハウジング１３Ａ、回転軸１４を介して、霧化頭本体１
９に設けられた受電電極２１に印加する。これにより、
受電電極２１に印加された高電圧は、螺旋状半導電体２
２を介して、帯電電極２３に供給される。これにより、
帯電電極２３の前端部２３Ａと被塗物との間、即ち、塗
料放出端縁１９Ｅと被塗物との間には、静電界が形成さ
れる。When coating an object to be coated such as a vehicle body, the air motor 13 is driven to rotate the rotary shaft 14 and the rotary atomizing head 18 at high speed. Then, a high voltage is generated by the high voltage generator 25, and this high voltage is passed through the motor housing 13A of the air motor 13 and the rotating shaft 14 to form the atomizing head body 1.
The voltage is applied to the power receiving electrode 21 provided in No. 9. This allows
The high voltage applied to the power receiving electrode 21 is applied to the spiral semi-conductor 2
It is supplied to the charging electrode 23 via 2. This allows
An electrostatic field is formed between the front end portion 23A of the charging electrode 23 and the object to be coated, that is, between the paint discharge edge 19E and the object to be coated.

【００６３】このような状態で、塗料チューブ１５Ａか
ら霧化頭本体１９の内周側に向けて塗料を供給すると、
この塗料は、各ハブ孔２０Ａを介して塗料薄膜化面１９
Ｄに流出し、塗料薄膜化面１９Ｄ上で薄膜化されて塗料
放出端縁１９Ｅから放出される。このとき、塗料は帯電
電極２３に供給されている高電圧によって直接帯電し、
帯電塗料粒子となって、静電力により被塗物に向かって
飛行する。さらに、塗料放出端縁１９Ｅから放出された
帯電塗料粒子は、シェーピングエア吐出口１６Ｃから吐
出しているシェーピングエアによってパターン成形され
つつ、静電力によって被塗物に塗着する。In this state, when the paint is supplied from the paint tube 15A toward the inner peripheral side of the atomizing head main body 19,
This paint is applied to the paint thin film surface 19 through each hub hole 20A.
It flows out to D, is made into a thin film on the paint thin film surface 19D, and is discharged from the paint discharge edge 19E. At this time, the paint is directly charged by the high voltage supplied to the charging electrode 23,
The particles become charged paint particles and fly toward an object by electrostatic force. Further, the charged paint particles discharged from the paint discharge edge 19E are applied to the object by electrostatic force while being pattern-formed by the shaping air discharged from the shaping air discharge port 16C.

【００６４】ここで、塗装中に、回転霧化頭１８と被塗
物とが異常接近した場合には、霧化頭本体１９に設けら
れた帯電電極２３と被塗物との距離が小さくなるため、
帯電電極２３と被塗物との間の空間に存在する抵抗値が
減少する。従って、高電圧発生器２５から帯電電極２３
に高電圧が供給されている状態では、帯電電極２３と被
塗物との間で放電が生じ易くなる。また、回転霧化頭１
８と被塗物とが接触し、帯電電極２３と被塗物とが接触
した場合には、帯電電極２３に供給された高電圧により
生じる電流が、帯電電極２３と被塗物との間に流れるよ
うになる。Here, when the rotary atomizing head 18 and the object to be coated are abnormally close to each other during coating, the distance between the charging electrode 23 provided on the atomizing head main body 19 and the object to be coated becomes small. For,
The resistance value existing in the space between the charging electrode 23 and the object to be coated decreases. Therefore, from the high voltage generator 25 to the charging electrode 23
In the state where a high voltage is applied to the charging electrode 23, discharge easily occurs between the charging electrode 23 and the object to be coated. Also, the rotary atomizing head 1
When 8 and the object to be coated come into contact with each other and the charging electrode 23 comes into contact with the object to be coated, a current generated by the high voltage supplied to the charging electrode 23 causes a current between the charging electrode 23 and the object to be coated. It comes to flow.

【００６５】ところが、高電圧発生器２５から回転軸１
４に印加された高電圧は、受電電極２１、螺旋状半導電
体２２を通過して帯電電極２３に供給されている。そし
て、螺旋状半導電体２２は、その後端部２２Ａから前端
部２２Ｂまでの抵抗値が、例えば１×１０8 Ω〜３×１
０8 Ω程度に設定されている。この結果、回転霧化頭１
８と被塗物が異常接近しても、高電圧発生器２５から印
加される高電圧によって生じる電流は、螺旋状半導電体
２２の高抵抗によって抑制されるため、帯電電極２３と
被塗物との間で放電が生じることはない。However, from the high voltage generator 25 to the rotary shaft 1
The high voltage applied to No. 4 passes through the power receiving electrode 21 and the spiral semi-conductor 22 and is supplied to the charging electrode 23. The resistance value of the spiral semiconductor 22 from the rear end 22A to the front end 22B is, for example, 1 × 10 8 Ω to 3 × 1.
It is set to about 0 8 Ω. As a result, the rotary atomizing head 1
8 and the object to be coated are abnormally close to each other, the current generated by the high voltage applied from the high voltage generator 25 is suppressed by the high resistance of the spiral semi-conductor 22. There is no discharge between and.

【００６６】また、回転霧化頭１８と被塗物が接触して
も、高電圧発生器２５から印加される高電圧によって生
じる電流は、螺旋状半導電体２２の高抵抗によって抑制
されるため、帯電電極２３と被塗物との間に流れる電流
は微小となる。Further, even if the rotary atomizing head 18 and the object to be coated come into contact with each other, the current generated by the high voltage applied from the high voltage generator 25 is suppressed by the high resistance of the spiral semi-conductor 22. The current flowing between the charging electrode 23 and the object to be coated becomes minute.

【００６７】かくして、本実施例によれば、回転霧化頭
１８の外周側に、受電電極２１，螺旋状半導電体２２、
帯電電極２３を設ける構成としたから、回転霧化頭１８
と被塗物とが異常接近または接触した場合に、回転霧化
頭１８と被塗物との間で火花放電が発生するのを確実に
防止することができる。Thus, according to this embodiment, on the outer peripheral side of the rotary atomizing head 18, the power receiving electrode 21, the spiral semi-conductor 22,
Since the charging electrode 23 is provided, the rotary atomizing head 18
It is possible to reliably prevent spark discharge from occurring between the rotary atomizing head 18 and the object to be coated when the object and the object to be coated abnormally approach or come into contact with each other.

【００６８】特に、本実施例によれば、螺旋状半導電体
２２を、霧化頭本体１９の後端側から前端側にかけて、
霧化頭本体１９の外周側を周回しつつ伸長する１本の線
または帯として設ける構成とした。これにより、回転霧
化頭１８に形成される抵抗は、等価的に考えると図６に
示すようになる。即ち、螺旋状半導電体２２は、回転霧
化頭１８の後端側から前端側にかけて多数の抵抗２６，
２６，…を螺旋状に直列接続したものと考えることがで
きる。In particular, according to this embodiment, the spiral semiconductive body 22 is provided from the rear end side to the front end side of the atomizing head main body 19,
The atomizing head body 19 is provided as a single line or band that extends while circling around the outer peripheral side. As a result, the resistance formed on the rotary atomizing head 18 is as shown in FIG. 6 when considered equivalently. That is, the spiral semiconductive body 22 has a large number of resistors 26 from the rear end side to the front end side of the rotary atomizing head 18.
It can be considered that 26, ... Are connected in series in a spiral shape.

【００６９】このため、螺旋状半導電体２２の後端部２
２Ａから前端部２２Ｂまでの間の抵抗値（螺旋状半導電
体２２の全体抵抗値）は、各抵抗２６の合計であり、高
電圧発生器２５から帯電電極２３に供給された高電圧に
よって生じる電流は、常に直列に接続された各抵抗２６
の総てを通過して帯電電極２３に到達することとなる。Therefore, the rear end portion 2 of the spiral semi-conductor 22 is
The resistance value between 2A and the front end portion 22B (total resistance value of the spiral semi-conductor 22) is the sum of the resistances 26, and is generated by the high voltage supplied from the high voltage generator 25 to the charging electrode 23. The current is always connected to each resistor 26 connected in series.
To reach the charging electrode 23.

【００７０】従って、螺旋状半導電体２２の部分的な厚
さの不均一や、螺旋状半導電体２２中に混練された導電
性材料の不均一等によって、各抵抗２６のうち、一部の
抵抗値が減少しても、螺旋状半導電体２２の全体抵抗値
は、実質的に変化しない。Therefore, due to the non-uniformity of the partial thickness of the spiral semi-conductor 22 and the non-uniformity of the conductive material kneaded in the spiral semi-conductor 22, a part of the resistors 26 is partially formed. The total resistance value of the spiral semi-conductor 22 does not substantially change even if the resistance value of the spiral semi-conductor 22 decreases.

【００７１】これにより、製造ばらつき、製造後に生じ
た傷等によって、螺旋状半導電体２２の厚さが不均一が
生じた場合等でも、塗装時に火花放電が発生するのを確
実に防止することができ、安全性、信頼性を向上させる
ことができる。Thus, even if the spiral semi-conductor 22 has a non-uniform thickness due to manufacturing variations or scratches after the production, it is possible to reliably prevent spark discharge from being generated during coating. It is possible to improve safety and reliability.

【００７２】また、高電圧発生器２５から印加された高
電圧によって生じる電流は、螺旋状半導電体２２に沿っ
て霧化頭本体１９の外周側を何周も周回して帯電電極２
３に到達する。即ち、受電電極２１から帯電電極２３ま
での電流の経路が非常に長いため、回転霧化頭１８と被
塗物が異常接近または接触しても、螺旋状半導電体２２
が絶縁破壊を起こすことはなく、絶縁破壊による沿面放
電を確実に防止することができる。The current generated by the high voltage applied from the high voltage generator 25 circulates along the spiral semiconductive body 22 around the outer circumference of the atomizing head main body 19 for many rounds, and charges the electrode 2.
Reach 3. That is, since the path of the current from the power receiving electrode 21 to the charging electrode 23 is very long, even if the rotary atomizing head 18 and the object to be coated come close to each other or come into contact with each other abnormally, the spiral semi-conductor 22
Does not cause dielectric breakdown, and creeping discharge due to dielectric breakdown can be reliably prevented.

【００７３】さらに、螺旋状半導電体２２の後端部２２
Ａから前端部２２Ｂまでの長さ寸法は非常に長い。この
ため、螺旋状半導電体２２の全体抵抗値は、実質的に螺
旋状半導電体２２の後端部２２Ａから前端部２２Ｂまで
長さ寸法、即ち、螺旋状半導電体２２を霧化頭本体１９
の外周側に何周巻回したかによって決定される。これに
より、螺旋状半導電体２２の単位長さ当りの抵抗値を低
く保ちながら、螺旋状半導電体２２の全体抵抗値を容易
に高く設定することができる。また、螺旋状半導電体２
２の長さ寸法（巻回数）を調整することによって螺旋状
半導電体２２の全体抵抗値を容易に調整することができ
る。Further, the rear end portion 22 of the spiral semi-conductor 22
The length dimension from A to the front end portion 22B is very long. Therefore, the overall resistance value of the spiral semi-conductor 22 is substantially the length dimension from the rear end 22A to the front end 22B of the spiral semi-conductor 22, that is, the atomizing head of the spiral semi-conductor 22. Body 19
It is determined by the number of turns on the outer peripheral side. This makes it possible to easily set the overall resistance value of the spiral semi-conductor 22 to be high while keeping the resistance value of the spiral semi-conductor 22 per unit length to be low. In addition, the spiral semi-conductor 2
The overall resistance value of the spiral semi-conductor 22 can be easily adjusted by adjusting the length dimension (number of turns) of 2.

【００７４】従って、本実施例では、図１３に示す従来
技術のように半導電性膜５の厚さを霧化頭本体３の外周
面３Ｂ全面において均一となるように加工するといった
難しい加工を施す必要がなくなり、製造作業を大幅に簡
単化できる。Therefore, in this embodiment, unlike the prior art shown in FIG. 13, it is difficult to process the semiconductive film 5 so that the thickness of the semiconductive film 5 is uniform on the entire outer peripheral surface 3B of the atomizing head body 3. There is no need to apply it, and the manufacturing work can be greatly simplified.

【００７５】また、本実施例によれば、霧化頭本体１９
の後端側外周に受電電極２１を設け、霧化頭本体１９の
前端側外周に帯電電極２３を設け、受電電極２１，帯電
電極２３のそれぞれの抵抗値を１ｃｍ2あたり１０2 Ω
〜１０7 Ω程度に設定したから、下記の効果を得ること
ができる。Further, according to this embodiment, the atomizing head main body 19
A power receiving electrode 21 is provided on the outer periphery of the rear end side, and a charging electrode 23 is provided on the outer periphery of the front end side of the atomizing head body 19, and the resistance values of the power receiving electrode 21 and the charging electrode 23 are 10 2 Ω per cm 2.
Since it is set to about 10 7 Ω, the following effects can be obtained.

【００７６】即ち、受電電極２１の内周側端部２１Ａと
回転軸１４との接触部、および帯電電極２３の前端部２
３Ａでは、電子の流れが集中し、局部的な絶縁破壊が生
じ易い。ところが、本実施例では、受電電極２１，帯電
電極２３のそれぞれの抵抗値を、螺旋状半導電体２２の
全体抵抗値と比較して大幅に低い値に設定しているた
め、受電電極２１，帯電電極２３はそれぞれ電極として
の役割を果たし、電子の流れが一局集中するのを防止す
ることができる。That is, the contact portion between the inner peripheral side end portion 21A of the power receiving electrode 21 and the rotating shaft 14 and the front end portion 2 of the charging electrode 23.
In 3A, the flow of electrons is concentrated and local dielectric breakdown is likely to occur. However, in the present embodiment, since the resistance values of the power receiving electrode 21 and the charging electrode 23 are set to values significantly lower than the overall resistance value of the spiral semi-conductor 22, the power receiving electrode 21, Each of the charging electrodes 23 plays a role as an electrode and can prevent the flow of electrons from concentrating locally.

【００７７】一方、本実施例によれば、霧化頭本体１９
の外周側に、受電電極２１、螺旋状半導電体２２、帯電
電極２３を外周側から覆うように、絶縁被膜２４を設け
る構成としている。このため、塗装時等に霧化頭本体１
９の外周側、即ち、受電電極２１、螺旋状半導電体２
２、帯電電極２３の各表面に塗料ミスト等が付着するの
を防止でき、塗料ミストを介して螺旋状半導電体２２等
が短絡するのを防止できる。On the other hand, according to this embodiment, the atomizing head main body 19
An insulating coating 24 is provided on the outer peripheral side so as to cover the power receiving electrode 21, the spiral semiconductive body 22, and the charging electrode 23 from the outer peripheral side. Therefore, the atomization head body 1
9, outer peripheral side, that is, the power receiving electrode 21, the spiral semi-conductor 2
2. It is possible to prevent the paint mist and the like from adhering to the respective surfaces of the charging electrode 23, and to prevent the spiral semiconductive body 22 and the like from being short-circuited via the paint mist.

【００７８】また、図４に示すように、霧化頭本体１９
の外周側に巻回された螺旋状半導電体２２のうち、ある
周の螺旋状半導電体２２と、その次の周の螺旋状半導電
体２２との間に、隙間ｂが形成される。この隙間ｂを、
絶縁被膜２４で埋めることができ、螺旋状半導電体２２
間の絶縁強度を高めることができる。Further, as shown in FIG. 4, the atomizing head main body 19
A gap b is formed between the spiral semi-conductor 22 of a certain circumference and the spiral semi-conductor 22 of the next circumference among the spiral semi-conductors 22 wound around the outer circumference of the spiral semi-conductor 22. . This gap b
It may be filled with an insulating coating 24, and may be a spiral semi-conductor 22.
The insulation strength between them can be increased.

【００７９】さらに、霧化頭本体１９の外周側に絶縁被
膜２４を設けることで、螺旋状半導電体２２を設けたこ
とによって生じる外周面１９Ｇの凹凸をなくし、霧化頭
本体１９の外周面１９Ｇを平滑な周面にすることができ
る。これにより、霧化頭本体１９の外周面１９Ｇの洗浄
性を高めることができる。Further, by providing the insulating coating 24 on the outer peripheral side of the atomizing head main body 19, the unevenness of the outer peripheral surface 19G caused by providing the spiral semiconductive body 22 is eliminated, and the outer peripheral surface of the atomizing head main body 19 is eliminated. 19G can have a smooth peripheral surface. Thereby, the cleanability of the outer peripheral surface 19G of the atomizing head main body 19 can be improved.

【００８０】次に、本発明の第２の実施例による回転霧
化頭型静電塗装装置を、図７ないし図９に基づいて説明
する。Next, a rotary atomizing head type electrostatic coating device according to a second embodiment of the present invention will be described with reference to FIGS. 7 to 9.

【００８１】本実施例の特徴は、回転霧化頭に、回転霧
化頭の後端側から塗料放出端縁に向けて回転霧化頭の外
周側を周回しつつ伸長する螺旋状溝を設け、該螺旋状溝
内に螺旋状半導電体を設ける構成としたことにある。な
お、本実施例では、前述した第１の実施例と同一の構成
要素に同一の符号を付し、その説明を省略するものとす
る。The feature of this embodiment is that the rotary atomizing head is provided with a spiral groove extending from the rear end side of the rotary atomizing head toward the paint discharge edge while wrapping around the outer peripheral side of the rotary atomizing head. The configuration is such that a spiral semi-conductor is provided in the spiral groove. In this embodiment, the same components as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.

【００８２】３１は回転軸１４の前端側に取付けられた
本実施例による回転霧化頭であり、該回転霧化頭３１
は、前述した第１の実施例による回転霧化頭１８と同様
に、回転霧化頭３１の外形をなす霧化頭本体３２と、該
霧化頭本体３２に取付けられたハブ部材２０とから構成
され、霧化頭本体３２とハブ部材２０は共に絶縁性樹脂
材料により形成されている。そして、霧化頭本体３２
は、第１の実施例による霧化頭本体１９と同様に、ベル
カップ部３２Ａ、回転軸取付部３２Ｂ、ハブ部材取付部
３２Ｃ、塗料薄膜化面３２Ｄとから大略構成されてい
る。Reference numeral 31 is a rotary atomizing head according to this embodiment, which is attached to the front end side of the rotary shaft 14, and the rotary atomizing head 31 is provided.
Like the rotary atomizing head 18 according to the first embodiment described above, is composed of an atomizing head main body 32 having an outer shape of the rotary atomizing head 31 and a hub member 20 attached to the atomizing head main body 32. The atomizing head main body 32 and the hub member 20 are both made of an insulating resin material. And the atomizing head body 32
Like the atomizing head main body 19 according to the first embodiment, is substantially composed of a bell cup portion 32A, a rotary shaft mounting portion 32B, a hub member mounting portion 32C, and a paint film thinning surface 32D.

【００８３】ところが、本実施例による霧化頭本体３２
は、その外周面３２Ｅの後部位置から後端面３２Ｆにか
けて、後述する受電電極３３を嵌め込むための受電電極
取付段部３２Ｇが形成されている。また、該霧化頭本体
３２の外周面３２Ｅ上には、該霧化頭本体３２の後端側
から前端側に向けて螺旋状に伸長する螺旋状溝３２Ｈが
形成されている。さらに、該霧化頭本体３２の前端部に
は、後述する金属リング３５を取付けるための金属リン
グ取付部３２Ｊが形成されている。However, the atomizing head body 32 according to the present embodiment.
A power receiving electrode mounting step 32G for fitting a power receiving electrode 33 described later is formed from the rear position of the outer peripheral surface 32E to the rear end surface 32F. Further, on the outer peripheral surface 32E of the atomizing head main body 32, a spiral groove 32H spirally extending from the rear end side to the front end side of the atomizing head main body 32 is formed. Further, at the front end portion of the atomizing head main body 32, a metal ring mounting portion 32J for mounting a metal ring 35 described later is formed.

【００８４】３３は霧化頭本体３２の受電電極取付段部
３２Ｇに嵌め込まれた受電電極を示し、該受電電極３３
は、第１の実施例による受電電極２１と同様に環状に形
成され、受電電極３３の内周側端部３３Ａは回転軸１４
に外周面に当接している。Reference numeral 33 denotes a power receiving electrode fitted in the power receiving electrode mounting step portion 32G of the atomizing head main body 32.
Is formed in an annular shape similarly to the power receiving electrode 21 according to the first embodiment, and the inner peripheral side end portion 33A of the power receiving electrode 33 has the rotating shaft 14
Is in contact with the outer peripheral surface.

【００８５】３４は霧化頭本体３２の螺旋状溝３２Ｈ内
に設けられた螺旋状半導電体を示し、該螺旋状半導電体
３４は、第１の実施例による螺旋状半導電体２２とほぼ
同様の半導電性材料により形成されている。そして、該
螺旋状半導電体３４は、この半導電性材料を螺旋状溝３
２Ｈに埋め込むことによって、霧化頭本体３２の外周側
を螺旋状に伸長している。また、該螺旋状半導電体３４
の後端部３４Ａは、図８に示すように受電電極３３に接
続され、該螺旋状半導電体３４の前端部３４Ｂは、図９
に示すように後述の金属リング３５に接続されている。Reference numeral 34 denotes a spiral semi-conductor provided in the spiral groove 32H of the atomizing head main body 32. The spiral semi-conductor 34 is the same as the spiral semi-conductor 22 according to the first embodiment. It is formed of almost the same semiconductive material. Then, the spiral semi-conductor 34 uses the semi-conductive material for the spiral groove 3.
By embedding in 2H, the outer peripheral side of the atomizing head main body 32 is spirally extended. In addition, the spiral semi-conductor 34
The rear end portion 34A is connected to the power receiving electrode 33 as shown in FIG. 8, and the front end portion 34B of the spiral semi-conductor 34 is shown in FIG.
It is connected to a metal ring 35 described later as shown in FIG.

【００８６】３５は霧化頭本体３２の金属リング取付部
３２Ｊに取付けられた導電性リングとしての金属リング
を示し、該金属リング３５は、例えば、鉄、アルミニウ
ム、ステンレススチール等の金属材料により断面三角形
状に形成され、霧化頭本体３２前端の円形に沿うように
環状に形成されている。また、該金属リング３５の内周
面３５Ａは、霧化頭本体３２の塗料薄膜化面３２Ｄと連
続的に連なるように形成され、該内周面３５Ａ上には、
塗料の微粒子化を容易ならしめるためのＶ字状の細溝３
５Ｂ，３５Ｂ，…が多数形成されている。また、金属リ
ング３５の前端側は塗料放出端縁３５Ｃとなっている。
ここで、金属リング３５には、螺旋状半導電体３４の前
端部３４Ｂが接続され、金属リング３５は、前述した第
１の実施例による帯電電極２３とほぼ同様の機能を果た
すものである。なお、金属リング３５を、導電性樹脂、
導電性材料を混練した樹脂を用いた半導電性材料等から
なるリングにより構成してもよい。Reference numeral 35 denotes a metal ring as a conductive ring attached to the metal ring attachment portion 32J of the atomizing head main body 32. The metal ring 35 has a cross section made of a metal material such as iron, aluminum or stainless steel. It is formed in a triangular shape, and is formed in an annular shape along the circle at the front end of the atomizing head main body 32. Further, the inner peripheral surface 35A of the metal ring 35 is formed so as to be continuous with the paint thinning surface 32D of the atomizing head main body 32, and on the inner peripheral surface 35A,
V-shaped narrow groove 3 for facilitating atomization of paint
Many 5B, 35B, ... Are formed. The front end side of the metal ring 35 is a paint discharge edge 35C.
Here, the front end portion 34B of the spiral semi-conductor 34 is connected to the metal ring 35, and the metal ring 35 has substantially the same function as the charging electrode 23 according to the first embodiment described above. The metal ring 35 is made of a conductive resin,
A ring made of a semi-conductive material or the like using a resin obtained by kneading a conductive material may be used.

【００８７】３６は霧化頭本体３２の外周側に設けられ
た絶縁被膜を示し、該絶縁被膜３６は、受電電極３３、
螺旋状半導電体３４、金属リング３５の外周面を外周側
から覆うように、霧化頭本体３２の外周面３２Ｅ，後端
面３２Ｆ上に設けられている。Reference numeral 36 denotes an insulating coating provided on the outer peripheral side of the atomizing head main body 32. The insulating coating 36 is the power receiving electrode 33,
The spiral semiconductive body 34 and the metal ring 35 are provided on the outer peripheral surface 32E and the rear end surface 32F of the atomizing head main body 32 so as to cover the outer peripheral surfaces from the outer peripheral side.

【００８８】このように構成される本実施例による回転
霧化頭型静電塗装装置によっても、前述した第１の実施
例とほぼ同様の作用効果を得ることができるものの、本
実施例では、受電電極取付段部３２Ｇ内に受電電極３３
を嵌め込み、螺旋状溝３２Ｈ内に螺旋状半導電体３４と
設け、金属リング取付部３２Ｊに金属リング３５を取付
ける構成としたから、霧化頭本体３２の外周側に螺旋状
半導電体３４を容易に螺旋状に形成することができると
共に、螺旋状半導電体３４の膜厚を均一にすることがで
きる。また、霧化頭本体３２の外周面３２Ｅを平滑な周
面とすることができ、絶縁被膜３６の膜厚を薄くができ
る。Although the rotary atomizing head type electrostatic coating device according to the present embodiment having the above-described structure can obtain substantially the same effect as that of the above-described first embodiment, in the present embodiment, The power receiving electrode 33 is provided in the power receiving electrode mounting step 32G.
Since the spiral semiconductor 34 is fitted in the spiral groove 32H and the metal ring 35 is attached to the metal ring mounting portion 32J, the spiral semiconductor 34 is provided on the outer peripheral side of the atomizing head main body 32. It can be easily formed into a spiral shape, and the film thickness of the spiral semiconductor 34 can be made uniform. Further, the outer peripheral surface 32E of the atomizing head main body 32 can be a smooth peripheral surface, and the film thickness of the insulating coating 36 can be reduced.

【００８９】さらに、金属リング３５の前端を塗料放出
端縁３５Ｃとすることにより、塗料放出端縁３５Ｃの強
度を高め、耐久性を向上させることができる。Furthermore, by making the front end of the metal ring 35 the paint discharge edge 35C, the strength of the paint discharge edge 35C can be increased and the durability can be improved.

【００９０】次に、本発明の第３の実施例による回転霧
化頭型静電塗装装置を、図１０に基づいて説明する。Next, a rotary atomizing head type electrostatic coating device according to a third embodiment of the present invention will be described with reference to FIG.

【００９１】本実施例の特徴は、回転霧化頭の外周側
に、該回転霧化頭の前端側から後端側に向けて伸長する
円筒部を設け、該円筒部の外周側に螺旋状半導電体を設
けたことにある。なお、本実施例では、前述した第１の
実施例と同一の構成要素に同一の符号を付し、その説明
を省略するものとする。The feature of this embodiment is that a cylindrical portion extending from the front end side to the rear end side of the rotary atomizing head is provided on the outer peripheral side of the rotary atomizing head, and the spiral shape is provided on the outer peripheral side of the cylindrical portion. There is a semi-conductor. In this embodiment, the same components as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.

【００９２】４１は塗装機本体の回転軸１４前端に取付
けられた回転霧化頭で、該回転霧化頭４１は、霧化頭本
体４２とハブ部材２０とから大略構成されている。そし
て、該回転霧化頭４１は、前述した第１の実施例による
回転霧化頭１８と同様の絶縁性樹脂材料により形成され
ている。Reference numeral 41 is a rotary atomizing head attached to the front end of the rotary shaft 14 of the main body of the coating machine, and the rotary atomizing head 41 is generally composed of an atomizing head main body 42 and a hub member 20. The rotary atomizing head 41 is formed of the same insulating resin material as the rotary atomizing head 18 according to the first embodiment described above.

【００９３】また、霧化頭本体４２は、その前端側に向
けて拡開して延びベル形またはカップ形に形成されたベ
ルカップ部４２Ａと、該ベルカップ部４２Ａから該霧化
頭本体４２の後端側に向けて延びた筒状の回転軸取付部
４２Ｂと、円筒状に形成されベルカップ部４２Ａの外周
側から後方に向けて突出し、後端側に回転軸取付部４２
Ｂとの間に環状空間４２Ｃを画成してなる円筒部４２Ｄ
と、ベルカップ部４２Ａの内周側に設けられハブ部材２
０が取付けられたハブ部材取付部４２Ｅと、塗料を薄膜
化させるために該ハブ部材取付部４２Ｅからベルカップ
部４２Ａの前端側にかけてベルカップ部４２Ａの内周面
に形成された塗料薄膜化面４２Ｆと、該塗料薄膜化面４
２Ｆによって薄膜化された塗料を液糸として放出する塗
料放出端縁４２Ｇとから大略構成されている。Further, the atomizing head main body 42 expands toward the front end side thereof and extends and extends to form a bell-shaped or cup-shaped bell cup portion 42A, and the atomizing head main body 42 from the bell cup portion 42A. A cylindrical rotary shaft mounting portion 42B that extends toward the rear end side and a cylindrically-shaped bell cup portion 42A that protrudes rearward from the outer peripheral side and that rotates toward the rear end side.
Cylindrical part 42D formed by defining an annular space 42C with B
And the hub member 2 provided on the inner peripheral side of the bell cup portion 42A.
0 is attached to the hub member mounting portion 42E, and a coating film thinning surface formed on the inner peripheral surface of the bell cup portion 42A from the hub member mounting portion 42E to the front end side of the bell cup portion 42A for thinning the coating material. 42F and the paint thin film surface 4
It is mainly composed of a paint discharge edge 42G which discharges the paint thinned by 2F as a liquid thread.

【００９４】さらに、塗料薄膜化面４２Ｆの前端側（塗
料放出端縁４２Ｇの内周面）には、Ｖ字状の細溝４２
Ｈ，４２Ｈ，…が塗料薄膜化面４２Ｆの全周に亘って多
数設けられている。Further, on the front end side of the coating film thinning surface 42F (inner peripheral surface of the coating material discharge edge 42G), a V-shaped narrow groove 42 is formed.
A large number of H, 42H, ... Are provided along the entire circumference of the paint film thinning surface 42F.

【００９５】ここで、前記円筒部４２Ｄは、霧化頭本体
４２の前端側から後端側に向けて、霧化頭本体４２の軸
方向（回転軸方向）と平行に伸長している。そして、該
円筒部４２Ｄは、霧化頭本体４２の前端位置で、ベルカ
ップ部４２Ａの外周側と連結して一体化しており、霧化
頭本体４２の後端位置では、回転軸取付部４２Ｂとの間
に環状空間４２Ｃを介して回転軸取付部４２Ｂの外周側
を包囲している。Here, the cylindrical portion 42D extends from the front end side to the rear end side of the atomizing head main body 42 in parallel with the axial direction (rotational axis direction) of the atomizing head main body 42. The cylindrical portion 42D is connected to and integrated with the outer peripheral side of the bell cup portion 42A at the front end position of the atomizing head main body 42, and at the rear end position of the atomizing head main body 42, the rotary shaft mounting portion 42B. And the outer peripheral side of the rotary shaft mounting portion 42B is surrounded by an annular space 42C.

【００９６】このように、霧化頭本体４２に円筒部４２
Ｄを設けたことにより、霧化頭本体４２の外周面に相当
する円筒部４２Ｄの外周面４２Ｊが、霧化頭本体４２の
前端側から後端側にかけて、回転軸方向と平行に伸長す
るようになる。これにより、霧化頭本体４２の外周面４
２Ｊの面積は、前述した第１の実施例による霧化頭本体
１９の外周面１９Ｇの面積よりも大きくなっている。In this way, the atomizing head main body 42 has a cylindrical portion 42.
By providing D, the outer peripheral surface 42J of the cylindrical portion 42D, which corresponds to the outer peripheral surface of the atomizing head main body 42, extends parallel to the rotation axis direction from the front end side to the rear end side of the atomizing head main body 42. become. Thereby, the outer peripheral surface 4 of the atomizing head main body 42
The area of 2J is larger than the area of the outer peripheral surface 19G of the atomizing head main body 19 according to the first embodiment described above.

【００９７】４３は回転軸取付部４２Ｂの後端面に設け
られた円環状の受電電極を示し、前述した第１の実施例
による受電電極２１と同様の半導電性材料により形成さ
れている。また、受電電極４３は、抵抗値が１ｃｍ2あ
たり１０2 Ω〜１０7 Ω程度となるように、その厚さ寸
法等が設定されている。さらに、該受電電極４３の内周
側端部４３Ａは、回転軸１４の外周面に当接している。Reference numeral 43 denotes an annular power receiving electrode provided on the rear end surface of the rotary shaft mounting portion 42B, which is made of the same semiconductive material as the power receiving electrode 21 according to the first embodiment. In addition, the thickness dimension and the like of the power receiving electrode 43 are set so that the resistance value is about 10 2 Ω to 10 7 Ω per cm 2 . Further, the inner peripheral side end portion 43A of the power receiving electrode 43 is in contact with the outer peripheral surface of the rotating shaft 14.

【００９８】４４は霧化頭本体４２の円筒部４２Ｄ外周
側に設けられた螺旋状半導電体を示し、該螺旋状半導電
体４４は、線状または帯状の１本の半導電性材料を、円
筒部４２Ｄの外周面４２Ｊ、円筒部４２Ｄの内周面４２
Ｋ、回転軸取付部４２Ｂの外周面４２Ｌに螺旋状に５回
〜１０００回程度巻回するようにして設けられている。
そして、該螺旋状半導電体４４の後端部４４Ａは、回転
軸取付部４２Ｂの後端側で受電電極４３に接続され、螺
旋状半導電体４４の前端部４４Ｂは、後述する帯電電極
４５に接続されている。また、螺旋状半導電体４４は、
その後端部４４Ａから前端部４４Ｂまでの間の抵抗値
（螺旋状半導電体２２の全体抵抗値）が１０7 Ω〜１０
9 Ω程度、好ましくは１×１０8 Ω〜３×１０8 Ω程度
となるように設定されている。Reference numeral 44 denotes a spiral semi-conductor provided on the outer peripheral side of the cylindrical portion 42D of the atomizing head main body 42. The spiral semi-conductor 44 is made of a linear or strip-shaped semi-conductive material. , The outer peripheral surface 42J of the cylindrical portion 42D, the inner peripheral surface 42 of the cylindrical portion 42D
K, the outer peripheral surface 42L of the rotary shaft mounting portion 42B is provided so as to be spirally wound about 5 to 1000 times.
The rear end portion 44A of the spiral semi-conductor 44 is connected to the power receiving electrode 43 on the rear end side of the rotary shaft mounting portion 42B, and the front end portion 44B of the spiral semi-conductor 44 has a charging electrode 45 described later. It is connected to the. Further, the spiral semi-conductor 44 is
The resistance value from the rear end portion 44A to the front end portion 44B (total resistance value of the spiral semiconductive body 22) is 10 7 Ω to 10
About 9 Omega, which is preferably set to be 1 × 10 8 Ω~3 × 10 8 Ω about.

【００９９】なお、本実施例では螺旋状半導電体４４
を、円筒部４２Ｄの外周面４２Ｊだけでなく、円筒部４
２Ｄの内周面４２Ｋ、回転軸取付部４２Ｂの外周面４２
Ｌにも螺旋状に設ける構成としたが、螺旋状半導電体４
４を、円筒部４２Ｄの外周面４２Ｊのみに設け、螺旋状
半導電体４４の後端部４４Ａと受電電極４３との間を半
導電性膜または導電性膜によって電気的に接続する構成
としてもよい。このとき、前記膜は、円筒部４２Ｄの内
周面４２Ｋと回転軸取付部４２Ｂの外周面４２Ｌとの各
面上を沿うように半導電性材料または導電性材料を線状
に伸長させる構成としてもよく、円筒部４２Ｄの内周面
４２Ｋと回転軸取付部４２Ｂの外周面４２Ｌに半導電性
材料まはた導電性材料をベタ塗りする構成としてもよ
い。In this embodiment, the spiral semi-conductor 44 is used.
Not only in the outer peripheral surface 42J of the cylindrical portion 42D, but also in the cylindrical portion 4D.
2D inner peripheral surface 42K, rotary shaft mounting portion 42B outer peripheral surface 42
The spiral semi-conductor 4 is also provided in the L shape.
4 may be provided only on the outer peripheral surface 42J of the cylindrical portion 42D, and the rear end portion 44A of the spiral semi-conductor 44 and the power receiving electrode 43 may be electrically connected by a semi-conductive film or a conductive film. Good. At this time, the film has a structure in which the semiconductive material or the conductive material is linearly extended along the inner peripheral surface 42K of the cylindrical portion 42D and the outer peripheral surface 42L of the rotary shaft mounting portion 42B. Alternatively, the inner peripheral surface 42K of the cylindrical portion 42D and the outer peripheral surface 42L of the rotary shaft mounting portion 42B may be solidly coated with a semiconductive material or a conductive material.

【０１００】４５は霧化頭本体４２の前端側に位置し、
該霧化頭本体４２の外周面４２Ｊ上に設けられた帯電電
極を示し、該帯電電極４５は、霧化頭本体４２の外周面
４２Ｊを全周に亘って伸長する環状の電極であり、該帯
電電極４５の前端部４５Ａは、霧化頭本体４２の塗料放
出端縁４２Ｇと実質的に同一の位置に配置されている。
また、帯電電極４５は、受電電極４３と同様の半導電性
材料により形成され、その抵抗値が１ｃｍ2あたり１０2
Ω〜１０6 Ω程度となるように、その厚さ寸法等が設
定されている。45 is located on the front end side of the atomizing head main body 42,
The charging electrode provided on the outer peripheral surface 42J of the atomizing head main body 42 is shown, and the charging electrode 45 is an annular electrode extending over the entire outer peripheral surface 42J of the atomizing head main body 42, The front end portion 45A of the charging electrode 45 is arranged at substantially the same position as the paint discharge end edge 42G of the atomizing head main body 42.
The charging electrode 45 is formed by the same semi-conductive material and the power receiving electrode 43, the resistance value is 1 cm 2 per 10 2
The thickness and the like are set so as to be about Ω to 10 6 Ω.

【０１０１】４６は霧化頭本体４２の外周側に設けられ
た絶縁被膜を示し、該絶縁被膜４６は、霧化頭本体４２
（円筒部４２Ｄ）の外周面４２Ｊ、円筒部４２Ｄの内周
面４２Ｋ，回転軸取付部４２Ｂの外周面４２Ｌ、回転軸
取付部４２Ｂの後端面の各面に全周に亘って設けられ、
受電電極４３、螺旋状半導電体４４、帯電電極４５のそ
れぞれの外側表面を覆っている。Reference numeral 46 denotes an insulating coating provided on the outer peripheral side of the atomizing head main body 42. The insulating coating 46 is the atomizing head main body 42.
The outer peripheral surface 42J of the (cylindrical portion 42D), the inner peripheral surface 42K of the cylindrical portion 42D, the outer peripheral surface 42L of the rotary shaft mounting portion 42B, and the rear end surface of the rotary shaft mounting portion 42B are provided over the entire circumference.
The outer surface of each of the power receiving electrode 43, the spiral semi-conductor 44, and the charging electrode 45 is covered.

【０１０２】このように構成される本実施例によって
も、前述した第１の実施例と同様の作用効果を得ること
ができるものの、特に本実施例では、霧化頭本体４２に
円筒部４２Ｄを設ける構成としたから、霧化頭本体４２
の外周面４２Ｊの面積を、第１の実施例による霧化頭本
体１９の外周面１９Ｇの面積よりも拡大することができ
る。これにより、本実施例による霧化頭本体４２は、第
１の実施例による霧化頭本体１９よりも、螺旋状半導電
体４４をより多く巻回することができ、螺旋状半導電体
４４の後端部４４Ａから前端部４４Ｂまでの長さ寸法を
大きくすることができる。According to this embodiment having such a structure, the same effects as those of the first embodiment described above can be obtained. In particular, however, in this embodiment, the atomizing head main body 42 is provided with the cylindrical portion 42D. Since the structure is provided, the atomizing head main body 42
The area of the outer peripheral surface 42J can be larger than the area of the outer peripheral surface 19G of the atomizing head main body 19 according to the first embodiment. As a result, the atomizing head main body 42 according to the present embodiment can wind more spiral hemiconductor 44 than the atomizing head main body 19 according to the first embodiment. The length dimension from the rear end portion 44A to the front end portion 44B can be increased.

【０１０３】これに加えて、本実施例では、螺旋状半導
電体４４を円筒部４２Ｄの外周面４２Ｊだけでなく、円
筒部４２Ｄの内周面４２Ｋ、回転軸取付部４２Ｂの外周
面４２Ｌにも配設する構成としたから、螺旋状半導電体
４４の長さ寸法をより一層大きくすることができる。In addition to this, in this embodiment, the spiral semi-conductor 44 is formed not only on the outer peripheral surface 42J of the cylindrical portion 42D but also on the inner peripheral surface 42K of the cylindrical portion 42D and the outer peripheral surface 42L of the rotary shaft mounting portion 42B. Since the arrangement is also provided, the length dimension of the spiral semi-conductor 44 can be further increased.

【０１０４】従って、本実施例によれば、螺旋状半導電
体４４の単位長さ当りの抵抗値を低く保ちながら螺旋状
半導電体４４の後端部４４Ａから前端部４４Ｂまでの抵
抗値をより一層高く設定することができ、塗装時に、回
転霧化頭４１と被塗物とが異常接近または接触したとき
に発生する火花放電をより一層確実に防止し、安全性を
高めることができる。Therefore, according to this embodiment, the resistance value from the rear end portion 44A to the front end portion 44B of the spiral semi-conductor 44 is kept low while keeping the resistance value per unit length of the spiral semi-conductor 44 low. It is possible to set the height higher, and it is possible to more reliably prevent spark discharge that occurs when the rotary atomizing head 41 and the object to be coated come into close proximity or come into contact with each other during coating, and it is possible to improve safety.

【０１０５】また、霧化頭本体４２に円筒部４２Ｄを設
けたことにより、霧化頭本体４２の外周面４２Ｊは、霧
化頭本体４２の後端側から前端側にかけて、回転軸方向
と平行に伸長する周面となる。このように、霧化頭本体
４２の外周面４２Ｊが傾斜していないため、霧化頭本体
４２の外周面４２Ｊ上に螺旋状半導電体４４を容易に設
けることができ、製造作業を簡単化することができる。Since the atomizing head main body 42 is provided with the cylindrical portion 42D, the outer peripheral surface 42J of the atomizing head main body 42 is parallel to the rotation axis direction from the rear end side to the front end side of the atomizing head main body 42. It becomes a peripheral surface that extends to. As described above, since the outer peripheral surface 42J of the atomizing head main body 42 is not inclined, the spiral semi-conductor 44 can be easily provided on the outer peripheral surface 42J of the atomizing head main body 42, and the manufacturing work is simplified. can do.

【０１０６】次に、本発明の第４の実施例による回転霧
化頭型静電塗装装置を、図１１に基づいて説明する。な
お、本実施例では、前述した第３の実施例と同一の構成
要素に同一の符号を付し、その説明を省略するものとす
る。Next, a rotary atomizing head type electrostatic coating device according to a fourth embodiment of the present invention will be described with reference to FIG. In this embodiment, the same components as those of the third embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.

【０１０７】本実施例による回転霧化頭型静電塗装装置
５１の特徴は、エアモータ１３のモータハウジング１３
Ａ前端側と、回転霧化頭４１との間に、絶縁樹脂材料か
らなる絶縁壁５２を設けたことにある。The rotary atomizing head type electrostatic coating apparatus 51 according to the present embodiment is characterized by the motor housing 13 of the air motor 13.
The insulating wall 52 made of an insulating resin material is provided between the front end side of A and the rotary atomizing head 41.

【０１０８】ここで、絶縁壁５２は、段付筒状に形成さ
れ、後端側がエアモータ１３のモータハウジング１３Ａ
の前端とシェーピングエアリング１６の内側リング１６
Ａとの間に取付固定された環状壁部５２Ａと、該環状壁
部５２Ａの内周側から回転霧化頭４１側に向けて軸方向
に突出した筒状壁部５２Ｂとから構成されている。そし
て、該絶縁壁５２の筒状壁部５２Ｂは、霧化頭本体４２
の環状空間Ｓ内に位置している。Here, the insulating wall 52 is formed in a stepped cylindrical shape, and the rear end side thereof is the motor housing 13A of the air motor 13.
Inner ring 16 of the front end and shaping air ring 16
It is composed of an annular wall portion 52A mounted and fixed between A and A, and a cylindrical wall portion 52B axially protruding from the inner peripheral side of the annular wall portion 52A toward the rotary atomizing head 41 side. . The tubular wall portion 52B of the insulating wall 52 is formed by the atomizing head main body 42.
It is located in the annular space S.

【０１０９】このように構成される本実施例によれば、
高電圧発生器２５からエアモータ１３のモータハウジン
グ１３Ａに印加された高電圧によって生じる電流が、霧
化頭本体４２の後端側に位置する円筒部４２Ｄの端縁に
向けて放電されるのを、絶縁壁５２によって防止するこ
とができ、放電による発火事故を確実に防止することが
できる。According to this embodiment having such a configuration,
The current generated by the high voltage applied from the high voltage generator 25 to the motor housing 13A of the air motor 13 is discharged toward the edge of the cylindrical portion 42D located on the rear end side of the atomizing head main body 42. This can be prevented by the insulating wall 52, and a fire accident due to electric discharge can be surely prevented.

【０１１０】なお、前記各実施例では、受電電極２１
（３３，４３）の内周側端部２１Ａ（３３Ａ，４３Ａ）
を回転軸１４の外周面に当接させるものとして述べた。
しかし、図１２に示す変形例のように、受電電極２１′
の内周側端部２１Ａ′と回転軸１４との間に、例えば
０．５ｍｍ〜２ｍｍ程度の隙間ｃを設ける構成としても
よい。これにより、回転軸１４と受電電極２１′の内周
側端部２１Ａ′との間に空気層を形成でき、両者の間を
高抵抗に保持した状態で、回転軸１４から受電電極２
１′に給電することができる。In each of the above embodiments, the power receiving electrode 21
Inner peripheral end 21A of (33, 43) (33A, 43A)
Has been described as being brought into contact with the outer peripheral surface of the rotating shaft 14.
However, as in the modification shown in FIG. 12, the power receiving electrode 21 '
A gap c of, for example, about 0.5 mm to 2 mm may be provided between the inner peripheral side end 21A ′ and the rotary shaft 14. As a result, an air layer can be formed between the rotary shaft 14 and the inner peripheral side end 21A 'of the power receiving electrode 21', and the rotary shaft 14 and the power receiving electrode 2 can be formed while maintaining a high resistance therebetween.
1'can be powered.

【０１１１】また、前記第１，第３の実施例では、霧化
頭本体１９（４２）の後端側外周に受電電極２１（４
３）を設け、霧化頭本体１９の前端側外周に帯電電極２
３（４６）を設け、受電電極２１（４３）と帯電電極２
３（４６）との間に螺旋状半導電体２２（４４）を設け
る構成とした。しかし、本発明はこれに限らず、螺旋状
半導電体２２（４４）の後端部２２Ａ（４４Ａ）を回転
軸１４の外周面に当接または近接するように配置し、螺
旋状半導電体２２（４４）の前端部２２Ｂ（４４Ｂ）を
塗料放出端縁１９Ｅ（４２Ｆ）と実質的に同一位置とな
るように配置する構成としてもよい。これにより、受電
電極２１（４３）と帯電電極２３（４６）を廃止でき
る。Further, in the first and third embodiments, the power receiving electrode 21 (4) is provided on the outer periphery of the atomizing head main body 19 (42) on the rear end side.
3) is provided, and the charging electrode 2 is provided on the outer circumference of the front end side of the atomizing head main body 19.
3 (46) is provided, and the power receiving electrode 21 (43) and the charging electrode 2 are provided.
3 (46) and the spiral semi-conductor 22 (44). However, the present invention is not limited to this, and the rear end portion 22A (44A) of the spiral semiconductive body 22 (44) is arranged so as to abut or come close to the outer peripheral surface of the rotating shaft 14, and the spiral semiconductive body is arranged. The front end portion 22B (44B) of 22 (44) may be arranged so as to be substantially at the same position as the paint discharge edge 19E (42F). Thereby, the power receiving electrode 21 (43) and the charging electrode 23 (46) can be eliminated.

【０１１２】[0112]

【発明の効果】以上詳述したとおり、請求項１に係る発
明によれば、回転霧化頭に、該回転霧化頭の後部側から
塗料放出端縁に向けて該回転霧化頭の外周側を周回しつ
つ伸長する螺旋状半導電体を設ける構成としたから、螺
旋状半導電体の後端側から前端側までの長さ寸法を大き
くすることができ、螺旋状半導電体の単位長さ当りの抵
抗値を低く保ちながら螺旋状半導電体の後端から前端ま
での間の抵抗値を高く設定することができる。As described in detail above, according to the invention of claim 1, the outer periphery of the rotary atomizing head is directed toward the paint discharge edge from the rear side of the rotary atomizing head. Since the spiral semiconductive body is provided so as to extend while encircling the side, it is possible to increase the length dimension from the rear end side to the front end side of the spiral semiconductive body. The resistance value from the rear end to the front end of the spiral semiconductive material can be set high while keeping the resistance value per length low.

【０１１３】従って、塗装時に、回転霧化頭と被塗物と
が異常接近または接触したときに、火花放電が生じるの
を防止することができ、塗装時の安全性を向上させるこ
とができる。Therefore, it is possible to prevent spark discharge from occurring when the rotary atomizing head and the object to be coated come into abnormal contact with each other during coating, and it is possible to improve the safety during coating.

【０１１４】特に、螺旋状半導電体の後端から前端まで
の間の抵抗値は、螺旋状半導電体の後端から前端までの
長さ寸法（巻回数）によって実質的に決定される。これ
により、螺旋状半導電体の部分的な厚さの不均一や、螺
旋状半導電体中に混練された導電性材料の不均一等によ
って、螺旋状半導電体の抵抗値が変動するのを防止でき
る。従って、製造上のばらつき、製造後に生じた傷等に
より、螺旋状半導電体の厚さが不均一な場合でも、塗装
時に火花放電が発生するのを確実に防止することがで
き、信頼性、耐久性を向上させることができる。In particular, the resistance value between the rear end and the front end of the spiral semi-conductor is substantially determined by the length dimension (number of turns) from the rear end to the front end of the spiral semi-conductor. As a result, the resistance value of the spiral semi-conductor changes due to non-uniformity of the partial thickness of the spiral semi-conductor or non-uniformity of the conductive material mixed in the spiral semi-conductor. Can be prevented. Therefore, even if the thickness of the spiral semi-conductor is non-uniform due to manufacturing variations, scratches produced after manufacturing, etc., spark discharge can be reliably prevented from occurring during coating, and reliability, The durability can be improved.

【０１１５】また、高電圧発生手段から印加される高電
圧によって生じる電流は、螺旋状半導電体によって形成
された螺旋状の長い経路を経て回転霧化頭の塗料放出端
縁に到達する。これにより、回転霧化頭と被塗物が異常
接近または接触したときに、回転霧化頭の外周面上で沿
面放電が発生するのを防止することができる。Further, the current generated by the high voltage applied from the high voltage generating means reaches the paint discharge edge of the rotary atomizing head through the long spiral path formed by the spiral semiconductor. Thus, when the rotary atomizing head and the object to be coated come into abnormal proximity or come into contact with each other, it is possible to prevent the occurrence of creeping discharge on the outer peripheral surface of the rotary atomizing head.

【０１１６】さらに、螺旋状半導電体の長さ寸法を調整
することにより、螺旋状半導電体の後端から前端までの
抵抗値を、容易に、かつ正確に調整することができる。Furthermore, by adjusting the length dimension of the spiral semi-conductor, the resistance value from the rear end to the front end of the spiral semi-conductor can be easily and accurately adjusted.

【０１１７】[0117]

【０１１８】[0118]

【０１１９】[0119]

【０１２０】[0120]

【０１２１】さらに、請求項１に係る発明によれば、回
転霧化頭の後端側に受電電極を設け、回転霧化頭の塗料
放出端縁に帯電電極を設け、螺旋状半導電体を受電電極
と帯電電極に接続する構成としたから、受電電極の抵抗
値と帯電電極の抵抗値を、螺旋状半導電体の抵抗値より
も低く設定することにより、高電圧発生手段から印加さ
れる高電圧によって生じる電流が回転霧化頭の後端部、
塗料放出端縁で一局集中するのを防止できる。従って、
回転霧化頭の後端部、塗料放出端縁で絶縁破壊が生じる
のを防止でき、火花放電を確実に防止できる。 Further, according to the invention of claim 1 , a power receiving electrode is provided at the rear end side of the rotary atomizing head, a charging electrode is provided at the paint discharge edge of the rotary atomizing head, and a spiral semi-conductor is provided. Since the configuration is such that the power receiving electrode and the charging electrode are connected, the resistance value of the power receiving electrode and the resistance value of the charging electrode are set to be lower than the resistance value of the spiral semi-conductor to apply the voltage from the high voltage generating means. The current generated by the high voltage is the rear end of the rotary atomizing head,
It is possible to prevent concentration at one point at the paint discharge edge. Therefore,
Dielectric breakdown can be prevented from occurring at the rear end of the rotary atomizing head and the paint discharge edge, and spark discharge can be reliably prevented.

【０１２２】請求項２に係る発明によれば、回転霧化頭
の前端部に導電性リングを設け、該導電性リングの前端
縁を塗料放出端縁としたことにより、塗料放出端縁の強
度を高め、耐久性を向上させることができる。According to the second aspect of the present invention, the conductive ring is provided at the front end of the rotary atomizing head, and the front edge of the conductive ring is used as the paint discharge edge. And the durability can be improved.

【０１２３】請求項３に係る発明によれば、回転霧化頭
を、該回転霧化頭の前端側に向けて拡開しベル形または
カップ形に形成されたベルカップ部と、該ベルカップ部
の後部側に設けられ該回転霧化頭を回転軸に取付ける回
転軸取付部と、ベルカップ部の外周側から回転霧化頭の
後部側に向けて円筒状に突出し、後端側に前記回転軸取
付部との間に環状空間を形成してなる円筒部とから構成
し、前記円筒部の外周面と内周面にはほぼ全面に亘って
螺旋状半導電体を設ける構成としたから、円筒部に巻回
する螺旋状半導電体の長さ寸法を大きくすることがで
き、螺旋状半導電体の単位長さ当りの抵抗値を低く保ち
ながら螺旋状半導電体の後端から前端までの抵抗値をよ
り一層高く設定することができる。According to the third aspect of the present invention, a bell cup portion formed in a bell shape or a cup shape by expanding the rotary atomizing head toward the front end side of the rotary atomizing head, and the bell cup. Of the rotary atomizing head, which is provided on the rear side of the rotary atomizing head and which mounts the rotary atomizing head on the rotary shaft, and which projects cylindrically from the outer peripheral side of the bell cup portion toward the rear side of the rotary atomizing head, and which is located at the rear end side It is composed of a cylindrical portion that forms an annular space between the rotary shaft mounting portion and the cylindrical semiconductive body is provided over the entire outer peripheral surface and the inner peripheral surface of the cylindrical portion. , It is possible to increase the length dimension of the spiral semi-conductor wound around the cylindrical part, and keep the resistance value per unit length of the spiral semi-conductor low while keeping the resistance from the rear end to the front end of the spiral semi-conductor. It is possible to set a higher resistance value up to.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の第１の実施例による回転霧化頭型静電
塗装装置を示す縦断面図である。FIG. 1 is a vertical sectional view showing a rotary atomizing head type electrostatic coating device according to a first embodiment of the present invention.

【図２】図１中の回転霧化頭を拡大して示す縦断面図で
ある。FIG. 2 is an enlarged vertical sectional view showing a rotary atomizing head in FIG.

【図３】図２中の回転霧化頭等を絶縁被膜を除いた状態
で矢示III −III 方向からみた横断面図である。FIG. 3 is a cross-sectional view of the rotary atomizing head and the like in FIG. 2 with the insulating coating removed, as seen from the direction of arrow III-III.

【図４】図２中のＡ部を示す要部拡大縦断面図である。FIG. 4 is an enlarged vertical sectional view of an essential part showing a portion A in FIG.

【図５】図２中のＢ部を示す要部拡大縦断面図である。FIG. 5 is an enlarged vertical sectional view of an essential part showing a B part in FIG.

【図６】第１の実施例による回転霧化頭の外周側に螺旋
状半導電体等を設けたことによって回転霧化頭に形成さ
れる抵抗回路を示す説明図である。FIG. 6 is an explanatory diagram showing a resistance circuit formed in the rotary atomizing head by providing a spiral semiconductive body or the like on the outer peripheral side of the rotary atomizing head according to the first embodiment.

【図７】本発明の第２の実施例による回転霧化頭型静電
塗装装置の回転霧化頭を示す縦断面図である。FIG. 7 is a vertical sectional view showing a rotary atomizing head of a rotary atomizing head type electrostatic coating device according to a second embodiment of the present invention.

【図８】図７中のＣ部を示す要部拡大縦断面図である。FIG. 8 is an enlarged vertical sectional view of an essential part showing a C part in FIG.

【図９】図７中のＤ部を示す要部拡大縦断面図である。FIG. 9 is an enlarged vertical sectional view of an essential part showing a D part in FIG. 7.

【図１０】本発明の第３の実施例による回転霧化頭型静
電塗装装置の回転霧化頭を示す縦断面図である。FIG. 10 is a vertical sectional view showing a rotary atomizing head of a rotary atomizing head type electrostatic coating device according to a third embodiment of the present invention.

【図１１】本発明の第４の実施例による回転霧化頭型静
電塗装装置を示す縦断面図である。FIG. 11 is a vertical sectional view showing a rotary atomizing head type electrostatic coating device according to a fourth embodiment of the present invention.

【図１２】受電電極の内周側端部と回転軸との間に空気
層を設けた変形例を示す要部拡大縦断面図である。FIG. 12 is an enlarged vertical cross-sectional view of essential parts showing a modified example in which an air layer is provided between the inner peripheral side end of the power receiving electrode and the rotating shaft.

【図１３】従来技術による回転霧化頭型静電塗装装置の
回転霧化頭を示す縦断面図である。FIG. 13 is a vertical cross-sectional view showing a rotary atomizing head of a rotary atomizing head type electrostatic coating device according to a conventional technique.

【図１４】従来技術による回転霧化頭の外周側に半導電
性膜を設けたことによって回転霧化頭に形成される抵抗
回路を示す説明図である。FIG. 14 is an explanatory diagram showing a resistance circuit formed on the rotary atomizing head by providing a semiconductive film on the outer peripheral side of the rotary atomizing head according to the conventional technique.

【符号の説明】[Explanation of symbols]

１２ カバー １３ エアモータ １４ 回転軸 １６ シェーピングエアリング １８，３１，４１ 回転霧化頭 １９，３２，４２ 霧化頭本体 １９Ａ，３２Ａ，４２Ａ ベルカップ部 １９Ｂ，３２Ｂ，４２Ｂ 回転軸取付部 １９Ｄ，３２Ｄ，４２Ｆ 塗料薄膜化面 １９Ｅ，３５Ｃ，４２Ｇ 塗料放出端縁 １９Ｇ，３２Ｅ，４２Ｊ 外周面 ２１，３３，４３ 受電電極 ２２，３４，４４ 螺旋状半導電体 ２３，４５ 帯電電極 ２４，３６，４６ 絶縁被膜 ２５ 高電圧発生器（高電圧発生手段） ３２Ｈ 螺旋状溝 ３５ 金属リング（導電性リング） ４２Ｃ 環状空間 ４２Ｄ 円筒部 ５２ 絶縁壁 12 covers 13 Air motor 14 rotation axis 16 shaping air ring 18, 31, 41 rotating atomizing head 19, 32, 42 Atomizing head body 19A, 32A, 42A Bell cup part 19B, 32B, 42B Rotating shaft mounting part 19D, 32D, 42F Paint thin film surface 19E, 35C, 42G Paint discharge edge 19G, 32E, 42J outer peripheral surface 21, 33, 43 Power receiving electrodes 22,34,44 Helical semi-conductor 23,45 Charging electrode 24, 36, 46 Insulation film 25 High voltage generator (high voltage generating means) 32H spiral groove 35 Metal ring (conductive ring) 42C annular space 42D cylindrical part 52 insulating wall

Claims (3)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 回転軸を駆動するためのエアモータと、
ベル形または筒状をなし後部側が回転軸に取付けられ前
端側が前記塗装機本体から供給された塗料を塗料粒子と
して噴霧する塗料放出端縁となった回転霧化頭と、該回
転霧化頭の放出端縁から噴霧される塗料に高電圧を帯電
すべく該回転霧化頭に前記回転軸を介して高電圧を印加
する高電圧発生手段とからなる回転霧化頭型静電塗装装
置において、 前記回転霧化頭を絶縁性樹脂材料により形成し、該回転
霧化頭には該回転霧化頭の後部側から塗料放出端縁に向
けて該回転霧化頭の外周側を周回しつつ伸長する螺旋状
半導電体を設け、前記回転霧化頭の後端部には一端側が前記回転軸の外周
面に近接または当接する受電電極を設け、前記回転霧化
頭の塗料放出端縁には該塗料放出端縁に沿って環状に伸
長し導電性材料または半導電性材料からなる帯電電極を
設け、前記螺旋状半導電体の後端側を前記受電電極に接
続し前記螺旋状半導電体の前端側を前記帯電電極に接続
し、 前記高電圧発生手段から前記回転軸を介して該螺旋状半
導電体の後端部の受電電極に印加される高電圧を、当該
螺旋状半導電体の前端部から前記帯電電極に供給する構
成としたことを特徴とする回転霧化頭型静電塗装装置。1. An air motor for driving a rotating shaft,
A rotary atomizing head having a bell shape or a tubular shape, the rear side of which is attached to a rotary shaft and the front end side of which is a paint discharge edge for spraying the paint supplied from the coating machine body as paint particles, and the rotary atomizing head. In a rotary atomizing head type electrostatic coating device comprising high voltage generating means for applying a high voltage to the rotary atomizing head via the rotary shaft in order to charge the paint sprayed from the discharge edge with a high voltage, The rotary atomizing head is formed of an insulating resin material, and the rotary atomizing head extends from the rear side of the rotary atomizing head toward the paint discharge edge while wrapping around the outer peripheral side of the rotary atomizing head. A spiral semi-conductor is provided, and one end side of the rear end of the rotary atomizing head is the outer circumference of the rotary shaft.
The rotary atomization is performed by providing a power receiving electrode that is close to or abuts the surface.
The paint discharge edge of the head extends annularly along the paint discharge edge.
A charging electrode made of long conductive material or semi-conductive material
And connect the rear end side of the spiral semi-conductor to the power receiving electrode.
Connect the front end side of the spiral semi-conductor to the charging electrode
Then, a high voltage applied from the high voltage generating means to the power receiving electrode at the rear end of the spiral semiconductive body via the rotating shaft is supplied from the front end of the spiral semiconductive body to the charging electrode . The rotary atomizing head type electrostatic coating device is characterized in that 【請求項２】 回転軸を駆動するためのエアモータと、
ベル形または筒状をなし後部側が回転軸に取付けられ前
端側が前記塗装機本体から供給された塗料を塗料粒子と
して噴霧する塗料放出端縁となった回転霧化頭と、該回
転霧化頭の放出端縁から噴霧される塗料に高電圧を帯電
すべく該回転霧化頭に前記回転軸を介して高電圧を印加
する高電圧発生手段とからなる回転霧化頭型静電塗装装
置において、 前記回転霧化頭を絶縁性樹脂材料により形成し、該回転
霧化頭には該回転霧化頭の後部側から塗料放出端縁に向
けて該回転霧化頭の外周側を周回しつつ伸長する螺旋状
半導電体を設け、 前記回転霧化頭の前端部に導電性材料
または半導電性材料からなる導電性リングを設け、該導
電性リングの前端縁を塗料放出端縁とし、 前記高電圧発生手段から前記回転軸を介して該螺旋状半
導電体の後端部に印加される高電圧を、当該螺旋状半導
電体の前端部から塗料放出端縁をなす前記導電性リング
に供給する構成としたことを特徴とする 回転霧化頭型静
電塗装装置。2. An air motor for driving a rotating shaft,
It has a bell shape or a cylindrical shape, and the rear side is attached to the rotary shaft
The end side is the paint supplied from the main body of the coating machine as paint particles.
The atomizing head that has become the paint discharge edge and sprays
High voltage applied to the paint sprayed from the discharge edge of the atomizing head
High voltage is applied to the rotary atomizing head through the rotary shaft to
Rotating atomizing head type electrostatic coating device comprising high voltage generating means
The rotary atomizing head is made of an insulating resin material,
The atomizing head is directed from the rear side of the rotary atomizing head to the paint discharge edge.
On the other hand, a spiral shape that extends while rotating around the outer peripheral side of the rotary atomizing head.
A semi- conductor is provided, and a conductive material is provided at the front end of the rotary atomizing head.
Or a conductive ring of semiconducting material is provided, the front edge of the conductive rings and the paint releasing edges, said spiral half from the high voltage generating means through said rotary shaft
The high voltage applied to the rear end of the conductor is
The conductive ring forming a paint discharge edge from the front end of the electric body
A rotary atomizing head type electrostatic coating device characterized in that it is configured to be supplied to . 【請求項３】 回転軸を駆動するためのエアモータと、
ベル形または筒状をなし後部側が回転軸に取付けられ前
端側が前記塗装機本体から供給された塗料を塗料粒子と
して噴霧する塗料放出端縁となった回転霧化頭と、該回
転霧化頭の放出端縁から噴霧される塗料に高電圧を帯電
すべく該回転霧化頭に前記回転軸を介して高電圧を印加
する高電圧発生手段とからなる回転霧化頭型静電塗装装
置において、 前記回転霧化頭を、絶縁性樹脂材料からなり該回転霧化
頭の前端側に向けて拡開しベル形またはカップ形に形成
されたベルカップ部と、絶縁性樹脂材料からなり該ベル
カップ部の後部側に設けられ該回転霧化頭を前記回転軸
に取付ける回転軸取付部と、絶縁性樹脂材料からなりベ
ルカップ部の外周側から回転霧化頭の後部側に向けて円
筒状に突出し、後端側に前記回転軸取付部との間に環状
空間を形成してなる円筒部とから構成し、 前記回転霧化頭には前記回転霧化頭の後部側から塗料放
出端縁に向けて前記回転霧化頭の外周側を周回しつつ伸
長し、 前記円筒部の外周面と内周面にほぼ全面に亘って
螺旋状半導電体を設け、 前記高電圧発生手段から前記回転軸を介して該螺旋状半
導電体の後端部に印加される高電圧を、当該螺旋状半導
電体の前端部から塗料放出端縁に供給する 構成としたこ
とを特徴とする回転霧化頭型静電塗装装置。3. An air motor for driving a rotating shaft,
It has a bell shape or a cylindrical shape, and the rear side is attached to the rotary shaft
The end side is the paint supplied from the main body of the coating machine as paint particles.
The atomizing head that has become the paint discharge edge and sprays
High voltage applied to the paint sprayed from the discharge edge of the atomizing head
High voltage is applied to the rotary atomizing head through the rotary shaft to
Rotating atomizing head type electrostatic coating device comprising high voltage generating means
In the installation, the rotary atomizing head is made of an insulating resin material and is expanded toward the front end side of the rotary atomizing head to form a bell-shaped or cup-shaped bell cup portion and an insulating resin material. A rotary shaft mounting portion provided on the rear side of the bell cup portion for mounting the rotary atomizing head to the rotary shaft, and a rear portion of the rotary atomizing head made of an insulating resin material from the outer peripheral side of the bell cup portion. protrudes in a cylindrical shape toward the side, and consists of a cylindrical portion formed by forming an annular space between the rotating shaft attaching portion on the rear end side, the the rotary atomizing head rear portion of the rotary atomizing head Paint is released from the side
While extending around the outer peripheral side of the rotary atomizing head toward the projecting edge
Poured, the cylindrical outer peripheral surface and the inner circumferential surface almost over the entire surface of the provided spiral semi-conductive, the high voltage through the rotational shaft from the generator the spiral half
The high voltage applied to the rear end of the conductor is
Octopus and configured to supply the paint releasing edges from the front end of the collector
A rotary atomizing head type electrostatic coating device characterized by:
JP32918796A 1996-11-25 1996-11-25 Rotary atomizing head type electrostatic coating equipment Expired - Fee Related JP3379623B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP32918796A JP3379623B2 (en) 1996-11-25 1996-11-25 Rotary atomizing head type electrostatic coating equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP32918796A JP3379623B2 (en) 1996-11-25 1996-11-25 Rotary atomizing head type electrostatic coating equipment

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JPH10151377A JPH10151377A (en) 1998-06-09
JP3379623B2 true JP3379623B2 (en) 2003-02-24

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JP32918796A Expired - Fee Related JP3379623B2 (en) 1996-11-25 1996-11-25 Rotary atomizing head type electrostatic coating equipment

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07220954A (en) * 1994-02-04 1995-08-18 Toshiba Corp Three-phase on-load tap switching transformer
JP3266438B2 (en) * 1994-09-30 2002-03-18 エービービー株式会社 Rotary atomizing head type coating equipment
JP3528375B2 (en) * 1994-11-30 2004-05-17 住友電気工業株式会社 Substrate and heat dissipation substrate using the same, semiconductor device, element mounting device

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JPH10151377A (en) 1998-06-09

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