JP2004321845A

JP2004321845A - Rotary atomizing type coating machine

Info

Publication number: JP2004321845A
Application number: JP2003115822A
Authority: JP
Inventors: Eiji Saito; 英治斉藤; Yasushi Yoshida; 康司吉田
Original assignee: Ransburg Industrial Finishing KK
Current assignee: Carlisle Fluid Technologies Ransburg Japan KK
Priority date: 2003-04-21
Filing date: 2003-04-21
Publication date: 2004-11-18
Also published as: TWI250046B; TW200507944A; CN1539556A; KR100597021B1; CN1298435C; KR20040091557A

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary atomizing type coating machine capable of controlling the relation between the supply amount of a coating material to be sprayed and the number of rotations of a bell by making the number of rotations of the bell constant to keep a predetermined spray state even if the supply amount of the coating material to be sprayed is changed. <P>SOLUTION: This rotary atomizing type coating machine comprises a valve device, which cooperates with a trigger lever, provided to an air flow channel for driving an air motor. This valve device is composed of a cylindrical valve comprising a circular cylinder hole member and a reciprocating cylinder member provided therein with a gap to control air passing through by the insertion position of the cylinder member into a hole member and a cone valve comprising a circular hole member and a cone member inserted in the circular hole member so as to close for controlling air passing through by changing an interval between the circular hole of the circular hole member and the conical surface of the cone member. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、回転霧化型塗装機、さらに詳しくは、塗装作業が容易かつ効率的に行うことができ、かつ長期にわたり安定して回転霧化が可能な回転霧化型塗装機に関する。
【０００２】
【従来の技術】
回転霧化型塗装機は、回転ベル型部材の遠心力を利用して塗料を霧化し、低圧エアを利用して霧状塗料粒子を被塗装物に均一にかつ効率的に向ける。噴霧された塗料粒子をターゲットにより高速で吹き付けるためには、静電荷を利用するためにベル等の回転体のエッジから放出されるコロナによって塗料に電荷を与える静電塗装を行う。回転霧化式塗装機は、塗着効率の良さ（約８０％以上）に特徴を有する。
【０００３】
従来の回転霧化型塗装機の霧化部３１４は、図１０に示すように、アウタシェープリング３５５、インナシェープリング３５７、ベル３５９、エアモータ３６１からなる一次組立体３６５は、エアモータ３６１の後端面の凹所に形成されたネジ３６１ａを用いて、ガンボディ３０３の先端部分の外周ネジ３０３ｂに螺合させることにより、一次組立体３６５がガンボディ３０３に装着される。
【０００４】
エアモータ３６１は、モータ本体３６７と、その周りを取り囲む絶縁性プラスチック材料からなるケース３６９とを含み、モータ本体３６７の出力軸３７１の先端部にベル３５９が取り付けられている。この出力軸３７１は、金属製の中空シャフトから構成されており、この中空出力軸３７１の中に塗料供給チューブ３６３が同軸且つ間隔を隔てて配置されている。出力軸３７１の後端部はモータ本体３６７から若干後方に突出しており、この突出部分３７１ａの外周面に形成したネジを利用して、出力軸３７１を塗料供給チューブ３６３に対して位置決めするための間隔保持部材３７３が螺着されている。
【０００５】
エアモータ３６１のプラスチック製ケース３６９には、第一エアポート３２５に連通する第一の内部通路３７５と、モータ本体３６７に通じる第二の内部通路３７７とが形成されている。第一の内部通路３７５は、第１エアポート３２５の出口を臨む環状入口３７５ａと、アウタシェープリング３５５とインナシェープリング３５７とが協働して形成するシェーピング通路３７９に開口する環状出口３７５ｂとを具備している。
【０００６】
また、第二の内部通路３７７は、塗料供給チューブ３６３の保持部材３６３ｂに隣接して位置する環状入口３７７ａを有している。塗料供給チューブ３６３の保持部材３６３ｂには、その外周部分に軸線に沿って延びる複数の貫通孔３６３ｄが形成され、この複数の貫通孔３６３ｄは周方向に互いに離間して配置されている。この保持部材３６３ｂは、螺旋３６３ａによってガンボディ３０３の固着される。
【０００７】
第一エアポート３２５から第一の内部通路３７５を経てシェーピング通路３７９に通じる一連の経路は、シェーピングエア通路を構成するものであり、このシェーピングエア通路を通る加圧エアは、アウタシェープリング３５５とインナシェープリング３５７との先端部分の隙間から吐出される。また、第二エアポート３２７から第二の内部通路３７７に導入された加圧エアによってエアモータ３６１が駆動され、これによりベル３５９及びこれに取付られ複数の傾斜噴射孔３５９ａを有する霧化デスク３５９ｂは高速回転する（例えば、特許文献１参照）。
【０００８】
他の従来技術の回転霧化型塗装機としては、タービンが駆動されている時の軸受エアの遮断による軸受の焼き付きを防ぐことを目的とし、十分な軸受エアが軸受エアチャンバへ供給されていなければ、エアシャトル集合体がタービンへの空気流入を阻止して回転部分の回転を停止する構造が提案されている（例えば、特許文献２参照）。
【０００９】
【特許文献１】
特開２００１−２０５１４３号全体。
【特許文献２】
特開平１０−１０３６４９号全体。
【００１０】
【発明が解決しようとする課題】
上述した従来の回転霧化型塗装機においては、トリガーレバーは、解放された休止状態にあるとき、ベルへ加圧エアが供給されずその回転を停止しかつ塗料の供給が停止されている。トリガーレバーを引き始めると、ベルに加圧エアが供給されて回転を開始し、やがて塗料の供給も始まり、塗料噴霧すなわち塗装が行われる。塗料噴霧の休止は、その時間の長短にかかわらず、トリガーレバーが引くことから解放され、塗料の供給が停止され、ベルへの加圧エアが供給されなくなってベルの回転が停止する。
【００１１】
ベルは、塗装時は通常約２０，０００〜４０，０００ｒｐｍで回転しているが、ベルが高圧エアが供給されてからこの回転速度になるまでに３ないし５秒を要する。ベルの所定回転速度以下の回転において塗料を供給すると、塗料は所定の寸法の粒子とならず、所望の塗装を行うことができない。従って、回転霧化型塗装機の１秒以下あるいは数秒の噴霧停止の場合であっても、ベルの所定回転速度を得るまで３ないし５秒の準備時間が必要になる。
【００１２】
さらに、トリガーレバーを引いてベルに加圧エアを供給すると、ベルの回転数は例えば４０，０００ｒｐｍである。この状態で塗料を供給して塗料噴霧を開始すると、塗料によるベルへの負荷の増加により例えば３０，０００ｒｐｍに低下する。すなわち、ベルへの加圧エアの供給量が一定であるから、塗料供給量の増減によって、ベルの回転への負荷が増減し、ベルの回転数が変化する。ベルの回転数の変化は、噴霧状態の変化、例えば噴霧粒子の寸法の変化や噴霧領域の変化をもたらし、均一な塗装作業を行う上で極めて不都合である。
【００１３】
【発明の目的】
本発明は、従来技術の回転霧化型塗装機の上述した問題に鑑みてなされたものであって、噴霧される塗料の供給量を変えても、ベルの回転数を一定にして所定の噴霧状態を維持する等、噴霧される塗料の供給量とベルの回転数の関係を制御できる回転霧化型塗装機を提供することを目的とする。
本発明はまた、塗料噴霧を中止するためにトリガーレバーの引く力を除去しても、塗料供給が停止し噴霧が行われなくなるが、ベルは回転し続ける。その結果、次の塗料噴霧を直ちに行うことができ、高品質で効率の良い塗装を行うことができる回転霧化型塗装機を提供することを目的とする。
本発明はまた、上述した塗料噴霧を中止するためにトリガーレバーの引く力を除去しかつ塗料供給を停止して噴霧をしない状態から、ベルに高圧エアを供給しない休止状態に容易に戻すことができる回転霧化型塗装機を提供することを目的とする。
【００１４】
【課題を解決するための手段】
第１発明は、筒状の塗料ガイド部材を有し、該塗料ガイド部材の周囲に配置されたエアモータによって該塗料ガイド部材の前方に配置された霧化デスク付きベルを回転させるように構成し、前記塗料ガイド部材を通過して前方に吐出された塗料を、回転する前記霧化デスク付きベルによって噴霧する回転霧化型塗装機において、
前記エアモータを駆動するためのエア流路に、トリガーレバーに連動する弁装置を設け、該弁装置は、
円筒孔部材とその中で空隙を置いて往復移動する円筒部材からなり、前記円筒孔部材の円筒孔への前記円筒部材の挿入位置によって通過エアを調整する円筒バルブと、
円孔部材とそこを閉塞するように挿入される円錐部材からなり、前記円孔部材の円孔と前記円錐部材の円錐面との間隔を変えることによって通過エアを調整する円錐バルブと
からなることを特徴とする回転霧化型塗装機である。
【００１５】
第１発明の実施形態は、以下のとおりである。
前記円筒部材と前記円錐部材が、前記トリガーレバーに連動する同一の連結部材に取付けられていることを特徴とする。このように構成することによって、簡易な構造で確実な操作を確保することができる。
塗料を噴霧する前記トリガーレバーの所定の引き領域において、トリガーレバーの引き量に対応して、塗料の供給量を増加させ、一方前記円筒孔への前記円筒部材の挿入量を減少させてエア供給量を増加させることにより、前記ベルの回転速度を制御することを特徴とする。
塗料を噴霧する前記トリガーレバーの所定の引き領域において、塗料供給量の変化にかかわらず前記ベルの回転速度を一定に制御することを特徴とする。このように構成することによって、塗料供給量の変化にかかわらず一定の噴霧粒子状態を維持することができる。
【００１６】
第２発明は、筒状の塗料ガイド部材を有し、該塗料ガイド部材の周囲に配置されたエアモータによって該塗料ガイド部材の前方に配置された霧化デスク付きベルを回転させるように構成し、前記塗料ガイド部材を通過して前方に吐出された塗料を、回転する前記霧化デスク付きベルによって噴霧する回転霧化型塗装機において、
前記霧化デスク付きベルの回転及び塗料供給量を制御するためのトリガーレバー部が、前記霧化デスク付きベルを回転させない休止状態と、前記霧化デスク付きベルを回転させ塗料を最大限供給する全引き状態との間で揺動可能であり、前記休止状態と全引状態に間に前記霧化デスク付きベルを回転させるが塗料を供給しない半引き状態があり、
休止状態から半引き状態は前記トリガーレバー部を引く一操作で行い、その後前記トリガーレバー部は全引き状態と半引き状態の間で揺動可能であり、半引き状態から休止状態にするには前記トリガーレバー部の解除操作を行うことを特徴とする回転霧化型塗装機である。
【００１７】
第２発明の実施態様は、以下のとおりである。
前記トリガーレバー部が、トリガーレバーと、該トリガーレバーの揺動面と平行な面内で揺動可能にかつ一方向に回動付勢されたカムレバーを有し、該カムレバーに設けたカムには回転霧化型塗装機ボデイに固着されたカムピンが係合し、前記カムは、全引き状態と半引き状態及びこれらの間の状態を可能にする作動カム部と、前記カムレバーの回動付勢方向と略反対方向の操作によって半引き状態から休止状態に変化させる休止カム部を有することを特徴とする請求項１に回転霧化型塗装機である。
このように構成することによって、簡易で故障のおそれがなく、操作も容易な回転霧化型塗装機を実現できる。
【００１８】
【発明の効果】
本発明によれば、噴霧される塗料の供給量を変えても、ベルの回転数を一定にして所定の噴霧状態を維持すること等、噴霧される塗料の供給量とベルの回転数の関係を制御できる回転霧化型塗装機を構成できる効果を有する。
本発明によればまた、塗料噴霧を中止するためにトリガーレバーの引く力を除去しても、塗料供給が停止し噴霧が行われなくなるが、ベルは回転し続ける。その結果、次の塗料噴霧を直ちに行うことができ、高品質で効率の良い塗装を行うことができる回転霧化型塗装機を構成できる効果を有する。
本発明はさらに、上述した塗料噴霧を中止するためにトリガーレバーの引く力を除去しかつ塗料供給を停止して噴霧をしない状態から容易にベルに高圧ガスを供給しない休止状態にすることができる回転霧化型塗装機を構成できる効果を有する。
【００１９】
【実施形態】
以下に、添付の図面に基づいて本発明の好ましい実施形態を詳しく説明する。
（全体の構成）
図１は、トリガーレバーが半引き状態である実施形態の回転霧化型塗装機の側面図である。図２は、トリガーレバー３４が略全引き状態である実施形態の回転霧化型塗装機の側面図である。図３は、トリガーレバーが解放（休止）状態である実施形態の回転霧化型塗装機の側面図である。図４は、実施形態の回転霧化型塗装機のハンドル部及び操作調整部の垂直断面図である。図８は、実施形態の回転霧化型塗装機の霧化部の垂直断面図である。図９は、実施形態のベル及び霧化デスクの正面図である。
【００２０】
回転霧化型塗装機１は、図１に示すように、ハンドル部１０と、ハンドル部１０の上方に位置する操作調節部１２と、操作調節部１２の前方端に位置する噴霧部１４とからなる。
【００２１】
（トリガー機構の構成）
ハンドル部１０は、把手部材２０の下端部にコンプレッサ（図示せず）に連通された高圧エアパイプ２２を取付るエアパイプコネクタ２４と、回転霧化型塗装機１内で使用する高圧エアの圧力を調整するエア調整ツマミ２６が設けられている。エア調整ツマミ２６は、図４に示すように、エアパイプコネクタ２４に連通した高圧エア通路２７に設けられた第１バルブ２８の第１バルブ調整部材２９を変位させて、第１バルブ２８の開閉状態を調整する。
【００２２】
操作調整部１２は、中央部に、ガンボデイ３０と、カムレバー３２を軸支したトリガーレバー３４と、フック３６と、塗料タンク（図示せず）に連結された塗料供給パイプ３８を取付ける塗料パイプコネクタ４０を有する。カムレバー３２は、ばね部材３３によって図１における反時計方向に回動付勢されている。
【００２３】
トリガーレバー３４は、図４に示すように、ガンボデイ３０にトリガーレバー支点部材３５によって軸支されている。高圧エア通路２７の第１バルブ２８の下流側に配置された第２バルブ３７の第２バルブ連結部材５０が、トリガーレバー３４の中間部に当接している。第２バルブ３７は、圧縮ばね３９を有していて、トリガーレバー３４を前方へ揺動させるように付勢している。第２バルブ３７は、第２バルブ連結部材５０によって第２バルブ調整部材５１が変位させられ、開閉状態が調整される。
【００２４】
図１に示すトリガーレバー３４の半引き状態は、後述するエアモータ２０２に高圧エアが供給されて、ベル２０６が回転させられる。トリガーレバー３４の半引き状態は、カムレバー３２のカム３２Ｃの中間段部４８がガンボデイ３０に固着されたカムピン４９に係合することによってロックされる。
【００２５】
図２に示すトリガーレバー３４の全引き状態では、高圧エアが供給されてベル２０６が回転しかつ塗料が供給されて霧化され、ベル２０６から噴射される。塗料噴霧のためのトリガーレバー３４の全引き状態は、第２バルブ連結部材５０の付勢力に抗してトリガーレバー３４を引き、カムピン４９がカム３２Ｃの前方端部５２に係合して形成される。トリガーレバー３４を、カムピン４９がカム３２Ｃの中間段部４８と前方端部５２の間にいずれの位置にあるように調整することによって、塗料の噴霧量を調整することができる。
【００２６】
トリガーレバー３４を解放状態すなわち休止位置（ホームポジション）にするには、図１に示すトリガーレバー３４の半引き状態において、カムレバー３４の操作突起６０を操作者の親指（図示せず）によって押すことによってカムレバー３２を時計方向に回転させる。これによって、カムピン４９はカム３２Ｃの中間段上部６２から後方端部６４に移動し、カムレバー３２の拘束の無くなったトリガーレバー３４は、図３に示す解放状態となる。
【００２７】
操作調整部１２の上側後方部には、塗料吐出量調整ツマミ７０及びシェ−ピングエア調整ツマミ７２が設けられている。塗料吐出量調整ツマミ７０は、図４に示すように、塗料パイプコネクタ４０に連通した塗料通路７４に配置された第３バルブ７６の第３調整弁部材７８とトリガーレバー３４の位置関係を変化させる。従って、塗料吐出量調整ツマミ７０を回転させることによって、トリガーレバー３４を引いた状態の塗料の供給量すなわち噴霧量を調整することができる。
シェ−ピングエア調整ツマミ７２は、高圧エア通路２７の第２バルブ３７の下流側に配置された第４バルブ８０の第４調整弁部材８２を変位させて、第４バルブ８０の開閉状態を調整する。
【００２８】
（第２バルブの構成）
一般塗装作業において、回転しているベル２０６への塗料の供給が変化することによって塗料を噴霧するためのベル２０６の負荷が増減しても、ベル２０６の回転速度は一定であることが望ましい。これを実現するために、第２バルブ３７は、二重バルブ構造となっている。
図５は、トリガーレバーが解放状態である実施形態の回転霧化型塗装機の第２バルブの垂直断面図である。図６は、トリガーレバーが半引き状態である実施形態の回転霧化型塗装機の第２バルブの垂直断面図である。図７は、トリガーレバーが全引き状態である実施形態の回転霧化型塗装機の第２バルブの垂直断面図である。
【００２９】
第２バルブ３７は、図５ないし図６に示すように、円筒バルブ１００及び円錐バルブ１０２を高圧エア通路２７に直列に配置してなる。円筒バルブ１００は、第２バルブ連結部材５０に固着された外径ｌ１の円筒形カラー部材１０４と、円筒形カラー部材５０の直径ｌ１よりも例えば０．６ｍｍ大きい内径ｌ２の円筒形孔１０６を有し、エア排出孔１０８を設けたカラー受け部材１１０とを有する。円筒バルブ１００は、円筒形カラー部材１０４と円筒形孔１０６の重なり状態によって高圧エアの通過量、すなわち高圧エアの圧力損失を調整することができる。トリガーレバー３４の解放状態（図５）及び半引き状態（図６）においては、円筒バルブ１００による高圧エアの圧力損失は大きく、両者の圧力損失は略同じである。これに比較して、トリガーレバー３４の全引き状態（図７）においては、高圧エアの円筒バルブ１００による圧力損失は小さくなる。
【００３０】
円錐バルブ１０２は、円孔１２０を有する受け部材１２２と、円錐形で第２バルブ連結部材５０に固着され、円孔１２０に係合する円錐形バルブ部材１２４とを有する。受け部材１２２の形状は、受け部材１２２と円錐形バルブ部材１２４が線接触するように決められる。
トリガーレバー３４の解放状態（図５）においては、受け部材１２２の当接部１３０に円錐形バルブ部材１２４が当接し、円錐バルブ１０２は完全に閉塞される。トリガーレバー３４の半引き状態（図６）においては、受け部材１２２の当接部１３０と円錐形バルブ部材１２４の間に小さい隙間ができ、高圧エアが通過する。この隙間が約０．３ｍｍを超えると、円錐バルブ１０２による高圧エアの圧力損失は略ゼロになる。トリガーレバー３４の全引き状態（図７）においては、受け部材１２２の当接部１３０と円錐形バルブ部材１２４の間に大きな隙間ができ、圧力損失なしで高圧エアが通過する。
【００３１】
第２バルブ３７は、円筒バルブ１００及び円錐バルブ１０２の調整によって、塗料の供給量の増加に伴ってベル２０６の回転数を増加させるようにあるいは減少させるように構成することも可能である。
【００３２】
（噴霧機構の構成）
噴霧部１４は、図８に示すように、その中心に配置されて操作調整部１２に回転不能に固着された塗料ガイド部材２００と、エアモータ２０２のモータシャフト２０４に固着されたベル２０６を有する。塗料ガイド部材２００は、略パイプ状であるが、前方側に環状凹部２１０が形成されている。一方、モータシャフト２０４の前方端部の内側には、合成樹脂製の塗料止めリング２１４が取付けられている。塗料止めリング２１４は、塗料ガイド部材２００の環状凹部２１０に軽く接触する２重の環状突出部２２０が設けられている。モータシャフト２０４の先端部に螺合されたベル２０６は、塗料が滑らかに流れるようにするための塗料誘導部材２２２を有し、さらに、図９に示すように、中央部に４つの傾斜噴射孔２２４を設け、周縁部に４つの噴射溝２２６を設けた霧化デスク２２８を有している。
【００３３】
噴霧部１４は、さらに、操作調整部１２に取付けられて噴霧部１４の後半分の外形を形成するマニホルド２３０と、マニホルド２３０の先端に螺合されて噴霧部１４の前半分の外形を形成するアウタシェープケース２３４を有する。ベル２０６とアウタシェープケース２３４の間には、インナーケース２３６が配置されている。
マニホルド２３０は、第４バルブ８０の下流側の高圧エア通路２７の高圧エアをエアモータ２０２のタービン２４０に送るタービンエア通路２４２と、同じく高圧エアをベル２０６とインナーケース２３６の間に送るためのシェーピングエア通路２４４を有する。
【００３４】
（操作方法）
本発明の回転霧化型塗装機は、不使用時は、図３に示すトリガーレバー３４が解放状態であり、フック３６を使用して壁等に吊り下げられている。
使用時は、必要ならば、エア調整ツマミ２６及びシェ−ピングエア調整ツマミ７２を操作して所望の高圧エアが得られるようにする。
【００３５】
次に、トリガーレバー３４を引いて、図１に示す半引き状態にする。この時、カムレバー３２も一緒に移動し、カムピン４９がカム３２Ｃの後方端部６４から中間段上部６２に達し、さらにカムレバー３２が反時計方向に回転して中間段部４８に達する。この結果、第２バルブ３７が解放され、高圧エアがタービンエア通路２４２及びシェーピングエア通路２４４に供給され、モータシャフト２０４及びベル２０６が高速回転し、ベル２０６とインナーケース２３６の間及びインナーケース２３６とアウタシェープケース２３４の間から高圧エアが噴射される。この時、第３調整弁部材７８は閉じていて、塗料は塗料ガイド部材２００側に供給されない。
【００３６】
次に、トリガーレバー３４を引くことによって所望量の塗料が塗料ガイド部材２００側に供給され、塗料の噴霧が開始する。塗料の噴霧量及び噴霧シェイプは、トリガーレバー３４の引き具合によって調整する。
噴霧を中止する時は、トリガーレバー３４の引くことを止めて、図１に示す半引き状態にする。この状態では、上述したように高圧エアがタービンエア通路２４２及びシェーピングエア通路２４４に供給され、モータシャフト２０４及びベル２０６が高速回転し、ベル２０６とインナーケース２３６の間及びインナーケース２３６とアウタシェープケース２３４の間から高圧エアが噴射されている。従って、この状態から容易に噴霧を開始することができる。
【００３７】
塗装作業を完全に停止するには、カムレバー３４の操作突起６０を操作者の親指（図示せず）によって押すことによって解除操作すなわちカムレバー３２を時計方向に回転させる。これによって、カムピン４９はカム３２Ｃの中間段上部６２から後方端部６４に移動し、カムレバー３２の拘束の無くなったトリガーレバー３４は、図３に示す解放状態となる。
【図面の簡単な説明】
【図１】本発明の実施形態の回転霧化型塗装機のトリガーレバーが半引き状態の側面図である。
【図２】本発明の実施形態の回転霧化型塗装機のトリガーレバーが全引き状態の側面図である。
【図３】本発明の実施形態の回転霧化型塗装機のトリガーレバーが解放状態の側面図である。
【図４】本発明の実施形態の回転霧化型塗装機のハンドル部及び操作調整部の垂直断面図である。
【図５】トリガーレバーが解放状態である本発明の実施形態の回転霧化型塗装機の第２バルブの垂直断面図である。
【図６】トリガーレバーが半引き状態である本発明の実施形態の回転霧化型塗装機の第２バルブの垂直断面図である。
【図７】トリガーレバーが全引き状態である本発明の実施形態の回転霧化型塗装機の第２バルブの垂直断面図である。
【図８】本発明の実施形態の回転霧化型塗装機の霧化部の垂直断面図である。
【図９】本発明の実施形態のベル及び霧化デスクの正面図である
【図１０】従来の回転霧化型塗装機の垂直断面図である。
【符号の説明】
１回転霧化型塗装機
１０ハンドル部
１２操作調節部
１４噴霧部
２０把手部材
２２高圧エアパイプ
２４エアパイプコネクタ
２６エア調整ツマミ
２７高圧エア通路
２８第１バルブ
２９第１バルブ調整部材
３０ガンボデイ
３２カムレバー
３４トリガーレバー
３７第２バルブ
３８塗料供給パイプ
４８中間段部
４９カムピン
５０第２バルブ連結部材
５２前方端部
６０操作突起
７０塗料吐出量調整ツマミ
７２シェ−ピングエア調整ツマミ
７６第３バルブ
７８第３調整弁部材
８０第４バルブ
２００塗料ガイド部材
２０４モータシャフト
２０６ベル
２１０環状凹部
２１４塗料止めリング
２２０環状突出部
２２２塗料誘導部材
２２４傾斜噴射孔
２２６噴射溝
２２８霧化デスク
２３０マニホルド[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotary atomizing type coating machine, and more particularly, to a rotary atomizing type coating machine capable of performing a coating operation easily and efficiently and stably performing a rotary atomization for a long period of time.
[0002]
[Prior art]
The rotary atomizing type coating machine atomizes the coating material by using the centrifugal force of a rotary bell member, and uniformly and efficiently directs the atomized coating particles to the object to be coated by using low-pressure air. In order to spray the sprayed paint particles onto the target at a high speed, electrostatic coating is performed in which the paint is charged by a corona emitted from the edge of a rotating body such as a bell in order to utilize an electrostatic charge. The rotary atomizing type coating machine is characterized by good coating efficiency (about 80% or more).
[0003]
As shown in FIG. 10, the atomizing unit 314 of the conventional rotary atomizing type coating machine includes a primary assembly 365 including an outer shape ring 355, an inner shape ring 357, a bell 359, and an air motor 361, and a rear end surface of the air motor 361. The primary assembly 365 is mounted on the gun body 303 by screwing it to the outer peripheral screw 303b at the tip of the gun body 303 using the screw 361a formed in the concave portion.
[0004]
The air motor 361 includes a motor main body 367 and a case 369 surrounding the motor main body 367 and made of an insulating plastic material. A bell 359 is attached to a tip end of an output shaft 371 of the motor main body 367. The output shaft 371 is formed of a hollow shaft made of metal, and a paint supply tube 363 is coaxially and spaced apart from the hollow output shaft 371. The rear end of the output shaft 371 projects slightly rearward from the motor main body 367, and is used to position the output shaft 371 with respect to the paint supply tube 363 by using a screw formed on the outer peripheral surface of the projecting portion 371a. The spacing member 373 is screwed.
[0005]
In a plastic case 369 of the air motor 361, a first internal passage 375 communicating with the first air port 325 and a second internal passage 377 communicating with the motor main body 367 are formed. The first internal passage 375 includes an annular inlet 375a facing the outlet of the first air port 325, and an annular outlet 375b opening to a shaping passage 379 formed by the outer shape ring 355 and the inner shape ring 357 cooperating with each other. are doing.
[0006]
Further, the second internal passage 377 has an annular inlet 377a located adjacent to the holding member 363b of the paint supply tube 363. The holding member 363b of the paint supply tube 363 has a plurality of through-holes 363d extending along the axis at an outer peripheral portion thereof, and the plurality of through-holes 363d are arranged apart from each other in a circumferential direction. The holding member 363b is fixed to the gun body 303 by the spiral 363a.
[0007]
A series of paths leading from the first air port 325 to the shaping passage 379 via the first internal passage 375 constitutes a shaping air passage, and pressurized air passing through the shaping air passage is supplied to the outer shape ring 355 and the inner shape. The liquid is discharged from a gap between the shape ring 357 and the tip portion. The air motor 361 is driven by pressurized air introduced into the second internal passage 377 from the second air port 327, whereby the bell 359 and the atomizing desk 359b attached to the bell 359 and having a plurality of inclined jet holes 359a are driven at high speed. It rotates (for example, see Patent Document 1).
[0008]
In other conventional rotary atomizing type coating machines, sufficient bearing air must be supplied to the bearing air chamber in order to prevent bearing seizure due to shutting off of the bearing air when the turbine is driven. For example, there has been proposed a structure in which an air shuttle assembly stops air from flowing into a turbine and stops rotation of a rotating part (for example, see Patent Document 2).
[0009]
[Patent Document 1]
JP 2001-205143 A whole.
[Patent Document 2]
JP-A-10-103649.
[0010]
[Problems to be solved by the invention]
In the conventional rotary atomizing type coating machine described above, when the trigger lever is in the released resting state, the pressurized air is not supplied to the bell, the rotation thereof is stopped, and the supply of the paint is stopped. When the trigger lever is started to be pulled, pressurized air is supplied to the bell and rotation starts, and then supply of paint is started, and paint spraying, that is, painting is performed. Regardless of the duration of the paint spraying, the trigger lever is released regardless of the length of time, the supply of the paint is stopped, the pressurized air is not supplied to the bell, and the rotation of the bell is stopped.
[0011]
The bell usually rotates at about 20,000 to 40,000 rpm at the time of painting, but it takes 3 to 5 seconds from when the bell is supplied with high-pressure air to reach this rotation speed. If the paint is supplied at a rotation speed lower than the predetermined rotation speed of the bell, the paint does not become particles of a predetermined size, and the desired coating cannot be performed. Therefore, even when the spraying of the rotary atomizing type coating machine is stopped for 1 second or less or several seconds, a preparation time of 3 to 5 seconds is required until a predetermined rotation speed of the bell is obtained.
[0012]
Further, when pressurized air is supplied to the bell by pulling the trigger lever, the rotation speed of the bell is, for example, 40,000 rpm. In this state, when the paint is supplied and the spraying of the paint is started, the load is reduced to, for example, 30,000 rpm due to an increase in the load on the bell by the paint. That is, since the supply amount of the pressurized air to the bell is constant, the load on the rotation of the bell increases or decreases according to the increase or decrease in the supply amount of the paint, and the rotation number of the bell changes. A change in the number of revolutions of the bell causes a change in the spray state, for example, a change in the size of the spray particles and a change in the spray area, which is extremely inconvenient in performing a uniform coating operation.
[0013]
[Object of the invention]
The present invention has been made in view of the above-described problems of the rotary atomizing type coating machine of the related art, and maintains a constant number of rotations of a bell even when a supply amount of paint to be sprayed is changed. An object of the present invention is to provide a rotary atomizing type coating machine capable of controlling the relationship between the supply amount of paint to be sprayed and the number of rotations of a bell, such as maintaining the state.
In the present invention, even if the pulling force of the trigger lever is removed to stop the spraying of the paint, the supply of the paint is stopped and the spray is not performed, but the bell continues to rotate. As a result, it is an object of the present invention to provide a rotary atomizing type coating machine capable of immediately performing the next spraying of the coating material and performing high quality and efficient coating.
The present invention also makes it possible to remove the pulling force of the trigger lever in order to stop the above-mentioned paint spraying, and to easily return from the state in which the paint supply is stopped and no spraying is performed to the rest state in which the high pressure air is not supplied to the bell. It is an object of the present invention to provide a rotary atomizing type coating machine which can be used.
[0014]
[Means for Solving the Problems]
The first invention has a tubular paint guide member, and is configured to rotate a bell with an atomizing desk arranged in front of the paint guide member by an air motor arranged around the paint guide member, In the rotary atomizing type coating machine that sprays the paint discharged forward through the paint guide member by the rotating bell with the atomizing desk,
A valve device interlocked with a trigger lever is provided in an air flow path for driving the air motor, and the valve device includes:
A cylindrical valve comprising a cylindrical hole member and a cylindrical member that reciprocates with a gap therein, and adjusting the passing air by an insertion position of the cylindrical member into the cylindrical hole of the cylindrical hole member,
A circular hole member and a conical member inserted so as to close the circular hole member, and a conical valve for adjusting the passing air by changing a distance between a circular hole of the circular hole member and a conical surface of the circular cone member. It is a rotary atomizing type coating machine characterized by the following.
[0015]
Embodiments of the first invention are as follows.
The cylindrical member and the conical member are attached to the same connecting member that interlocks with the trigger lever. With this configuration, it is possible to ensure reliable operation with a simple structure.
In a predetermined pulling region of the trigger lever for spraying the paint, the supply amount of the paint is increased in accordance with the pull amount of the trigger lever, while the insertion amount of the cylindrical member into the cylindrical hole is reduced to supply the air. The rotational speed of the bell is controlled by increasing the amount.
In a predetermined pulling region of the trigger lever for spraying the paint, the rotation speed of the bell is controlled to be constant regardless of a change in the paint supply amount. With this configuration, it is possible to maintain a constant spray particle state regardless of a change in the paint supply amount.
[0016]
The second invention has a cylindrical paint guide member, and is configured to rotate a bell with an atomizing desk arranged in front of the paint guide member by an air motor arranged around the paint guide member, In the rotary atomizing type coating machine that sprays the paint discharged forward through the paint guide member by the rotating bell with the atomizing desk,
The trigger lever for controlling the rotation of the bell with the atomizing desk and the amount of paint supplied is in a rest state in which the bell with the atomizing desk is not rotated, and the bell with the desk is rotated to supply the paint to the maximum. It is swingable between a full pull state and a half-pull state in which the atomizing desk-equipped bell is rotated between the pause state and the full pull state but does not supply paint,
The half-pull state from the halt state is performed by one operation of pulling the trigger lever unit, and then the trigger lever unit can swing between the full-pull state and the half-pull state. A rotary atomizing type coating machine characterized in that a release operation of the trigger lever portion is performed.
[0017]
Embodiments of the second invention are as follows.
The trigger lever portion includes a trigger lever, and a cam lever that is swingably urged in one direction in a plane parallel to a swing plane of the trigger lever. A cam pin fixed to the body of the rotary atomizing type coating machine is engaged, and the cam is capable of operating in a fully-pulled state, a half-pulled state, and a state therebetween, and a rotational bias of the cam lever. 2. The rotary atomizing type coating machine according to claim 1, further comprising a rest cam portion for changing from a half-pull state to a rest state by operation in a direction substantially opposite to the direction.
With this configuration, it is possible to realize a rotary atomizing type coating machine that is simple, has no risk of failure, and is easy to operate.
[0018]
【The invention's effect】
According to the present invention, even if the supply amount of the paint to be sprayed is changed, the relationship between the supply amount of the paint to be sprayed and the rotation speed of the bell, such as maintaining a predetermined spraying state while keeping the rotation speed of the bell constant. This has the effect that a rotary atomizing type coating machine capable of controlling the temperature can be configured.
According to the present invention, even if the pulling force of the trigger lever is removed to stop the spraying of the paint, the supply of the paint is stopped and the spray is not performed, but the bell continues to rotate. As a result, the next paint spraying can be immediately performed, and there is an effect that a rotary atomizing type coating machine capable of performing high quality and efficient coating can be configured.
According to the present invention, the pulling force of the trigger lever can be removed to stop the above-described paint spraying, and the paint supply can be stopped to stop the paint spraying from the state where the spraying is not performed to the state where the high pressure gas is not easily supplied to the bell. This has the effect that a rotary atomizing type coating machine can be configured.
[0019]
Embodiment
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
(Overall configuration)
FIG. 1 is a side view of a rotary atomizing type coating machine according to an embodiment in which a trigger lever is in a half-pull state. FIG. 2 is a side view of the rotary atomizing type coating machine of the embodiment in which the trigger lever 34 is in a substantially fully pulled state. FIG. 3 is a side view of the rotary atomizing type coating machine according to the embodiment in which the trigger lever is in a released (paused) state. FIG. 4 is a vertical sectional view of a handle portion and an operation adjusting portion of the rotary atomizing type coating machine of the embodiment. FIG. 8 is a vertical cross-sectional view of an atomizing unit of the rotary atomizing type coating machine according to the embodiment. FIG. 9 is a front view of the bell and the atomizing desk of the embodiment.
[0020]
As shown in FIG. 1, the rotary atomizing type coating machine 1 includes a handle unit 10, an operation adjustment unit 12 located above the handle unit 10, and a spray unit 14 located at a front end of the operation adjustment unit 12. Become.
[0021]
(Configuration of trigger mechanism)
The handle 10 adjusts the pressure of the high-pressure air used in the rotary atomizing type coating machine 1 with an air pipe connector 24 for attaching a high-pressure air pipe 22 connected to a compressor (not shown) at the lower end of the handle member 20. An air adjustment knob 26 is provided. As shown in FIG. 4, the air adjustment knob 26 displaces the first valve adjustment member 29 of the first valve 28 provided in the high-pressure air passage 27 communicating with the air pipe connector 24 to open and close the first valve 28. To adjust.
[0022]
The operation adjusting unit 12 includes a paint pipe connector 40 for attaching a paint supply pipe 38 connected to a paint tank (not shown), a hook 36, a gun lever 30 that pivotally supports the cam body 32, a gun body 30, a central part, and the like. Having. The cam lever 32 is urged to rotate counterclockwise in FIG. 1 by a spring member 33.
[0023]
The trigger lever 34 is pivotally supported on the gun body 30 by a trigger lever fulcrum member 35, as shown in FIG. The second valve connecting member 50 of the second valve 37 disposed downstream of the first valve 28 in the high-pressure air passage 27 is in contact with an intermediate portion of the trigger lever 34. The second valve 37 has a compression spring 39 and urges the trigger lever 34 to swing forward. In the second valve 37, the second valve adjusting member 51 is displaced by the second valve connecting member 50, and the open / close state is adjusted.
[0024]
In the half-pull state of the trigger lever 34 shown in FIG. 1, high-pressure air is supplied to an air motor 202 described later, and the bell 206 is rotated. The half-pull state of the trigger lever 34 is locked by the engagement of the intermediate step 48 of the cam 32C of the cam lever 32 with the cam pin 49 fixed to the gun body 30.
[0025]
In a fully pulled state of the trigger lever 34 shown in FIG. 2, high pressure air is supplied to rotate the bell 206, paint is supplied and atomized, and the bell 206 is ejected. The fully pulled state of the trigger lever 34 for spraying the paint is formed by pulling the trigger lever 34 against the urging force of the second valve connecting member 50 and engaging the cam pin 49 with the front end 52 of the cam 32C. You. By adjusting the trigger lever 34 so that the cam pin 49 is located between the intermediate step portion 48 and the front end portion 52 of the cam 32C, the spray amount of the paint can be adjusted.
[0026]
To set the trigger lever 34 in the release state, that is, the rest position (home position), the operation protrusion 60 of the cam lever 34 is pressed by the thumb (not shown) of the operator in the half-pull state of the trigger lever 34 shown in FIG. As a result, the cam lever 32 is rotated clockwise. As a result, the cam pin 49 moves from the upper middle portion 62 of the cam 32C to the rear end 64, and the trigger lever 34 in which the restriction of the cam lever 32 is released is brought into the released state shown in FIG.
[0027]
A paint discharge amount adjustment knob 70 and a shaping air adjustment knob 72 are provided at an upper rear portion of the operation adjustment unit 12. As shown in FIG. 4, the paint discharge amount adjustment knob 70 changes the positional relationship between the third adjustment valve member 78 of the third valve 76 and the trigger lever 34 disposed in the paint passage 74 communicating with the paint pipe connector 40. . Therefore, by rotating the paint discharge amount adjustment knob 70, the supply amount of paint while the trigger lever 34 is pulled, that is, the spray amount can be adjusted.
The shaping air adjustment knob 72 adjusts the open / close state of the fourth valve 80 by displacing the fourth adjustment valve member 82 of the fourth valve 80 disposed downstream of the second valve 37 in the high-pressure air passage 27. .
[0028]
(Configuration of the second valve)
In the general painting operation, it is desirable that the rotation speed of the bell 206 be constant even if the load of the bell 206 for spraying the paint increases or decreases due to a change in the supply of the paint to the rotating bell 206. To achieve this, the second valve 37 has a double valve structure.
FIG. 5 is a vertical cross-sectional view of the second valve of the rotary atomizing type coating machine of the embodiment in which the trigger lever is released. FIG. 6 is a vertical sectional view of the second valve of the rotary atomizing type coating machine of the embodiment in which the trigger lever is in a half-pull state. FIG. 7 is a vertical sectional view of the second valve of the rotary atomizing type coating machine of the embodiment in which the trigger lever is fully pulled.
[0029]
5 and 6, the second valve 37 has a cylindrical valve 100 and a conical valve 102 arranged in series with the high-pressure air passage 27. The cylindrical valve 100 has a cylindrical collar member 104 having an outer diameter 11 fixed to the second valve connecting member 50, and a cylindrical hole 106 having an inner diameter 12 larger by 0.6 mm than the diameter 11 of the cylindrical collar member 50. And a color receiving member 110 provided with an air discharge hole 108. The cylindrical valve 100 can adjust the amount of high-pressure air passing, that is, the pressure loss of the high-pressure air, depending on the overlapping state of the cylindrical collar member 104 and the cylindrical hole 106. In the release state (FIG. 5) and the half-pull state (FIG. 6) of the trigger lever 34, the pressure loss of the high-pressure air by the cylindrical valve 100 is large, and the pressure loss of both is substantially the same. In comparison, when the trigger lever 34 is fully pulled (FIG. 7), the pressure loss of the high-pressure air by the cylindrical valve 100 is small.
[0030]
The conical valve 102 has a receiving member 122 having a circular hole 120, and a conical valve member 124 fixed to the second valve connecting member 50 in a conical shape and engaging with the circular hole 120. The shape of the receiving member 122 is determined such that the receiving member 122 and the conical valve member 124 are in line contact.
When the trigger lever 34 is released (FIG. 5), the conical valve member 124 contacts the contact portion 130 of the receiving member 122, and the conical valve 102 is completely closed. When the trigger lever 34 is in the half-pulled state (FIG. 6), a small gap is formed between the abutting portion 130 of the receiving member 122 and the conical valve member 124, and high-pressure air passes therethrough. When this gap exceeds about 0.3 mm, the pressure loss of the high-pressure air by the conical valve 102 becomes substantially zero. When the trigger lever 34 is fully pulled (FIG. 7), a large gap is formed between the abutting portion 130 of the receiving member 122 and the conical valve member 124, and high-pressure air passes without pressure loss.
[0031]
The second valve 37 may be configured to increase or decrease the rotation speed of the bell 206 with an increase in the supply amount of the paint by adjusting the cylindrical valve 100 and the conical valve 102.
[0032]
(Configuration of spray mechanism)
As shown in FIG. 8, the spray unit 14 includes a paint guide member 200 which is arranged at the center thereof and is non-rotatably fixed to the operation adjustment unit 12, and a bell 206 which is fixed to a motor shaft 204 of the air motor 202. The paint guide member 200 is substantially pipe-shaped, but has an annular recess 210 formed on the front side. On the other hand, a paint stop ring 214 made of a synthetic resin is mounted inside the front end of the motor shaft 204. The paint stop ring 214 is provided with a double annular protrusion 220 that comes into light contact with the annular recess 210 of the paint guide member 200. The bell 206 screwed to the tip of the motor shaft 204 has a paint guiding member 222 for allowing the paint to flow smoothly, and further has four inclined injection holes at the center as shown in FIG. 224, and an atomizing desk 228 provided with four injection grooves 226 on the periphery.
[0033]
The spray unit 14 is further attached to the operation adjustment unit 12 and forms a rear half outer shape of the spray unit 14, and is screwed to a tip of the manifold 230 to form a front half outer shape of the spray unit 14. It has an outer shape case 234. An inner case 236 is arranged between the bell 206 and the outer shape case 234.
The manifold 230 includes a turbine air passage 242 that sends high-pressure air in the high-pressure air passage 27 downstream of the fourth valve 80 to the turbine 240 of the air motor 202, and a shaping for sending high-pressure air between the bell 206 and the inner case 236. It has an air passage 244.
[0034]
(Method of operation)
When the rotary atomizing type coating machine of the present invention is not used, the trigger lever 34 shown in FIG. 3 is in an open state and is hung on a wall or the like using a hook 36.
In use, if necessary, the air adjustment knob 26 and the shaping air adjustment knob 72 are operated so that desired high-pressure air is obtained.
[0035]
Next, the trigger lever 34 is pulled to the half-pull state shown in FIG. At this time, the cam lever 32 also moves, and the cam pin 49 reaches the middle step upper portion 62 from the rear end 64 of the cam 32C, and further, the cam lever 32 rotates counterclockwise to reach the middle step portion 48. As a result, the second valve 37 is released, high-pressure air is supplied to the turbine air passage 242 and the shaping air passage 244, the motor shaft 204 and the bell 206 rotate at high speed, and the space between the bell 206 and the inner case 236 and the inner case 236 And high pressure air is injected from between the outer shape case 234 and the outer shape case 234. At this time, the third adjusting valve member 78 is closed, and the paint is not supplied to the paint guide member 200 side.
[0036]
Next, by pulling the trigger lever 34, a desired amount of paint is supplied to the paint guide member 200 side, and spraying of paint starts. The spray amount and the spray shape of the paint are adjusted by the pulling degree of the trigger lever 34.
When the spraying is stopped, the pulling of the trigger lever 34 is stopped, and the half-pulling state shown in FIG. 1 is set. In this state, high-pressure air is supplied to the turbine air passage 242 and the shaping air passage 244 as described above, the motor shaft 204 and the bell 206 rotate at high speed, and the space between the bell 206 and the inner case 236 and between the inner case 236 and the outer shape High-pressure air is injected from between the cases 234. Therefore, spraying can be easily started from this state.
[0037]
To completely stop the painting operation, the release operation, that is, the cam lever 32 is rotated clockwise by pressing the operation projection 60 of the cam lever 34 with the thumb (not shown) of the operator. As a result, the cam pin 49 moves from the upper middle portion 62 of the cam 32C to the rear end 64, and the trigger lever 34 in which the restriction of the cam lever 32 is released is brought into the released state shown in FIG.
[Brief description of the drawings]
FIG. 1 is a side view of a rotary atomization type coating machine according to an embodiment of the present invention, in which a trigger lever is in a half-pull state.
FIG. 2 is a side view of the rotary atomizing type coating machine according to the embodiment of the present invention in a state where a trigger lever is fully pulled.
FIG. 3 is a side view of the rotary atomization type coating machine according to the embodiment of the present invention in a state where a trigger lever is released.
FIG. 4 is a vertical sectional view of a handle portion and an operation adjusting portion of the rotary atomizing type coating machine according to the embodiment of the present invention.
FIG. 5 is a vertical sectional view of a second valve of the rotary atomizing type coating machine according to the embodiment of the present invention, in which a trigger lever is released.
FIG. 6 is a vertical sectional view of a second valve of the rotary atomizing type coating machine according to the embodiment of the present invention in which a trigger lever is in a half-pull state.
FIG. 7 is a vertical sectional view of a second valve of the rotary atomizing type coating machine according to the embodiment of the present invention in which a trigger lever is fully pulled.
FIG. 8 is a vertical sectional view of an atomizing section of the rotary atomizing type coating machine according to the embodiment of the present invention.
FIG. 9 is a front view of a bell and an atomizing desk according to an embodiment of the present invention. FIG. 10 is a vertical sectional view of a conventional rotary atomizing type coating machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotary atomizing type coating machine 10 Handle part 12 Operation adjustment part 14 Spray part 20 Handle member 22 High pressure air pipe 24 Air pipe connector 26 Air adjustment knob 27 High pressure air passage 28 First valve 29 First valve adjustment member 30 Gum body 32 Cam lever 34 Trigger Lever 37 Second valve 38 Paint supply pipe 48 Intermediate step 49 Cam pin 50 Second valve connecting member 52 Front end 60 Operation protrusion 70 Paint discharge amount adjustment knob 72 Shaping air adjustment knob 76 Third valve 78 Third adjustment valve member 80 fourth valve 200 paint guide member 204 motor shaft 206 bell 210 annular recess 214 paint stop ring 220 annular protrusion 222 paint guide member 224 inclined spray hole 226 spray groove 228 atomizing desk 230 manifold

Claims

A tubular paint guide member is arranged, and an air motor arranged around the paint guide member is configured to rotate a bell with an atomizing desk arranged in front of the paint guide member. In the rotary atomizing type coating machine that sprays the paint that has passed through and is discharged forward, by the rotating bell with the atomizing desk,
A valve device interlocked with a trigger lever is provided in an air flow path for driving the air motor, and the valve device includes:
A cylindrical valve comprising a cylindrical hole member and a cylindrical member that reciprocates with a gap therein, and adjusting the passing air by an insertion position of the cylindrical member into the cylindrical hole of the cylindrical hole member,
A circular hole member and a conical member inserted so as to close the circular hole member, and a conical valve for adjusting the passing air by changing a distance between a circular hole of the circular hole member and a conical surface of the circular cone member. Rotary atomizing type coating machine.

The rotary atomizing type coating machine according to claim 1, wherein the cylindrical member and the conical member are attached to the same connecting member that interlocks with the trigger lever.

In a predetermined pulling region of the trigger lever for spraying the paint, the supply amount of the paint is increased in accordance with the pull amount of the trigger lever, while the insertion amount of the cylindrical member into the cylindrical hole is reduced to supply the air. The rotary atomizing type coating machine according to claim 1, wherein the rotation speed of the bell is controlled by increasing the amount.

4. The rotary atomizing type coating machine according to claim 3, wherein in a predetermined pulling region of the trigger lever for spraying the paint, the rotation speed of the bell is controlled to be constant irrespective of a change in the paint supply amount.

It has a cylindrical paint guide member, and is configured to rotate a bell with an atomizing desk arranged in front of the paint guide member by an air motor arranged around the paint guide member, and the paint guide member In the rotary atomizing type coating machine which sprays the paint discharged through and forward by the rotating bell with the atomizing desk,
The trigger lever for controlling the rotation of the bell with the atomizing desk and the amount of paint supplied is in a rest state in which the bell with the atomizing desk is not rotated, and the bell with the desk is rotated to supply the paint to the maximum. It is swingable between a full pull state and a half-pull state in which the atomizing desk-equipped bell is rotated between the pause state and the full pull state but does not supply paint,
The half-pull state from the halt state is performed by one operation of pulling the trigger lever unit, and then the trigger lever unit can swing between the full-pull state and the half-pull state. A rotary atomizing type coating machine characterized by performing a release operation of the trigger lever portion.

The trigger lever portion includes a trigger lever, and a cam lever that is swingably urged in one direction in a plane parallel to a swing plane of the trigger lever. A cam pin fixed to the body of the rotary atomizing type coating machine is engaged, and the cam is capable of operating in a fully-pulled state, a half-pulled state, and a state therebetween, and a rotational bias of the cam lever. 2. The rotary atomizing type coating machine according to claim 1, further comprising a rest cam portion that changes from a half-pull state to a rest state by operation in a direction substantially opposite to the direction.