JP3680154B2 - Electrode tip extraction device - Google Patents

Electrode tip extraction device Download PDF

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JP3680154B2
JP3680154B2 JP18645198A JP18645198A JP3680154B2 JP 3680154 B2 JP3680154 B2 JP 3680154B2 JP 18645198 A JP18645198 A JP 18645198A JP 18645198 A JP18645198 A JP 18645198A JP 3680154 B2 JP3680154 B2 JP 3680154B2
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rotation
claw piece
electrode tip
tip
holding member
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JP2000015455A (en
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和宏 手澤
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Kyokutoh Co Ltd
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Kyokutoh Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、抵抗溶接機のシャンクにおけるテーパ軸に嵌合された電極チップの交換時に、電極チップをシャンクから抜き取る電極チップの抜き取り装置に関する。
【０００２】
【従来の技術とその課題】
従来、この種の抜き取り装置としては、シャンクと電極チップとの間の部位に、膨張部材やクサビを打ち込んで、電極チップをシャンクから離すようにして、、電極チップを抜き取る装置や、シャンクから外れるように電極チップに細かい打撃を与えて、電極チップを抜き取る装置があった（特開平３−２９１１７５号公報、特開平４−９２８５号公報等参照）。
【０００３】
しかし、膨張部材やクサビを打ち込むタイプは、電極チップの全長を挿通させて、シャンクと電極チップとの間に、膨張部位やクサビ部位を配置させ、さらに、抜き取った電極チップを保持する機構を電極チップの先端付近に配置させる必要があることから、電極チップ付近に配置させる部位の厚さが厚くなって、上下に配置されるシャンクの間が小さい溶接ロボット等には、使用し難かった。
【０００４】
また、打撃を与えるタイプは、電極チップに打撃を与える際に、何度も衝突音が発生し、騒音となる虞れが生じていた。
【０００５】
本発明は、上述の課題を解決するものであり、電極チップ付近に配置させる部位の厚さを薄くでき、シャンク間の狭い部位に嵌合された電極チップでも容易に抜き取ることができ、さらに、作業時の音の発生を抑えることができる電極チップの抜き取り装置を提供することを目的とする。
【０００６】
【課題を解決するための手段】
本発明に係る抜き取り装置は、抵抗溶接機のシャンクにおけるテーパ軸に嵌合された電極チップを回転させて抜き取る電極チップの抜き取り装置であって、
正転・逆転可能にケース内に収納保持されるとともに、回動中心に前記電極チップを挿入可能な挿通孔を備えた回動基盤と、
前記挿通孔の内周面に配置されて、前記挿通孔の軸方向と平行な回動軸を構成する支持軸を略長方形板状の本体の両端面から突出させるとともに、前記挿通孔内に挿入された電極チップ側の先端を鋭角状に形成させて、回動時、前記挿通孔内で前記電極チップを保持可能に、前記先端を、前記電極チップの中心方向側に回転させて、前記電極チップの外周面に食い込ませる領域と、前記挿通孔内での前記電極チップの保持を解除可能に、前記先端を、前記電極チップの外周面に食い込ませた方向と逆方向に回転させて、前記電極チップの外周面から離脱させる退避領域と、にそれぞれ配置可能に保持される爪片と、
前記回動基盤と一致する回動中心を備えて、前記回動基盤を挿通し、かつ、端部を前記回動基盤から突出させるように配設されるとともに、該回動中心に前記電極チップを挿入可能な挿通孔を備え、前記支持軸を嵌挿させて前記爪片を回動可能に保持するとともに、前記回動基盤と相対回転可能でかつ回転制動力を受けて回動可能に、前記ケース内に収納保持される保持部材と、
前記保持部材に回転制動力を付加するブレーキ装置と、
を備えて構成され、
前記回動基盤が、正転時、前記爪片を、前記支持軸を回転軸として、前記回動基盤の回転方向と同じ方向に回転させつつ、前記食い込み領域まで押圧して回転させる食い込み用押圧面と、逆転時、前記爪片を、前記支持軸を回転軸として、前記回動基盤の逆転方向と同じ方向に回転させつつ、前記退避領域まで押圧して回転させる退避用押圧面と、を備え、
前記ブレーキ装置が、前記保持部材における前記回動基盤から突出した外周面に摩擦抵抗を加えるように、付勢手段によって前記保持部材外周面に押圧可能として、前記ケースに支持されるブレーキアームを備え、
前記保持部材に付加される回転制動力が、前記ブレーキアームによりなされるとともに、前記爪片の前記食い込み領域への配置時における前記爪片の食い込み抵抗の増大時、前記爪片の前記先端が前記電極チップの中心方向に完全に向く前に、前記爪片の前記支持軸を嵌挿させている支持部位を回転作用面として、前記回動基盤の正転時の回転トルクを受け、前記回動基盤とともに前記保持部材を回転可能とする大きさ、として設定されていることを特徴とする。
そして、前記保持部材若しくは前記回動基盤の挿通孔の内径寸法を、前記爪片の前記食い込み領域への配置時、前記爪片で押圧された前記電極チップの外周面を内周面に圧接可能な寸法、として設定するとともに、前記爪片の前記食い込み領域への配置時、前記爪片の先端と、前記電極チップを圧接された前記保持部材若しくは前記回動基盤の挿通孔の内周面と、により、前記電極チップを保持可能に、前記爪片を、一つ、若しくは、二つ、配設する。
あるいは、前記爪片の前記食い込み領域への配置時、前記爪片の先端だけで前記電極チップを保持可能に、前記爪片を、前記挿通孔の内周面の部位に、３か所以上放射状に配設する。
【００１２】
【発明の効果】
本発明に係る抜き取り装置では、電極チップの抜き取り時、まず、電極チップを回動基盤の挿通孔に挿入させるように、電極チップに回動基盤を外装させ、ついで、回動基盤を正転させる。
【００１３】
すると、回動基盤の食い込み用押圧面が、爪片に当接して爪片を食い込み領域まで回転させることから、爪片の先端が、電極チップを挿通孔内で保持可能に、電極チップの外周面に食い込む。
【００１４】
そしてさらに、回動基盤が正転すれば、爪片の食い込み抵抗が増大し、保持部材は、爪片の支持部位を回転作用面として、回動基盤の正転時の回転トルクを受け、回転制動力に抗して、回動基盤とともに正転する。
すなわち、保持部材が、爪片を電極チップに食い込ませて電極チップを挿通孔内で保持した状態で、爪片とともに、回転するため、電極チップが、回動基盤の正転方向に回転する。そして、電極チップが僅かでも回転すれば、シャンクのテーパ軸との電極チップの嵌合状態が解除される。そのため、その後、回動基盤や保持部材等を、シャンクの先端側に移動させれば、電極チップをシャンクから抜き取ることができる。
【００１５】
その後、回動基盤や保持部材等を所定位置に配置させた後、回動基盤を逆転させる。すると、回動基盤の退避用押圧面が、爪片に当接して、さらに、爪片を回転させて、爪片の先端が、挿通孔内での電極チップの保持を解除する退避領域に配置され、電極チップは、回動基盤の挿通孔から落下して、所定位置に収容することができる。なお、この回動基盤の逆転は、爪片の食い込み抵抗が低減される方向の回転であり、保持部材は回転制動力を受けて回転せず、回動基盤だけが逆転して、爪片が退避領域に回動することとなる。
【００１６】
したがって、本発明に係る抜き取り装置では、電極チップ付近に配置される部位が、回動基盤、爪片を保持した保持部材等であって、さらに、電極チップを外す際の回転機構自体が、抜き取った電極チップを保持する機構と兼用であるため、薄く構成できて、シャンク間の狭い部位に嵌合された電極チップでも容易に抜き取ることができる。また、抜き取り作業時には、単に、爪片を電極チップに食い込ませるだけであって、衝突するような衝撃音が発生せず、作業時の音の発生を極力抑えることができる。
【００１７】
そして、保持部材に回転制動力を与えるブレーキ装置を配設させて、保持部材への回転制動力を、爪片の食い込み領域への配置時における爪片の食い込み抵抗の増大時、爪片の支持部位を回転作用面として、回動基盤の正転時の回転トルクを受け、回動基盤とともに保持部材を回転可能とする大きさ、として設定しておけば、爪片が電極チップに食い込んだ状態で回動基盤が正転した際、爪片の食い込み抵抗が増大し、保持部材はブレーキ装置の回転制動力を受けていても、爪片の支持部位を回転作用面として、回動基盤の正転時の回転トルクを受けて、回転制動力に抗して、回動基盤とともに正転することができる。さらに、その後の回動基盤の逆転時には、爪片の食い込み抵抗が低減される方向の回転であり、保持部材は回転制動力を受けて回転せず、回動基盤だけが逆転して、爪片が退避領域 に回動することとなる。
【００１８】
この場合、保持部材を、回動基盤を挿通するように配設させるとともに、端部を回動基盤から突出させ、ブレーキ装置に、保持部材における回動基盤から突出した外周面に摩擦抵抗を加えるように、付勢手段によって保持部材外周面に押圧されるブレーキアームを設け、保持部材に付加する回転制動力を、ブレーキアームにより発生させるように構成すれば、ブレーキアームを保持部材の厚さ以内に抑えることが可能となり、さらに、ブレーキアーム以外のブレーキ装置の部位を、電極チップの近傍部位から離すことができることから、ブレーキ装置を設けていても、抜き取り装置における電極チップの近傍部位の厚さを厚くせずに薄くすることが可能となり、一層、シャンク間の狭い部位に嵌合された電極チップでも容易に抜き取ることができる。
【００１９】
さらに、爪片を、１つとして、保持部材若しくは回動基盤の挿通孔の内径寸法を、爪片の食い込み領域への配置時、その挿通孔の内周面における爪片と対向する部位に、爪片で押圧された電極チップの外周面を圧接可能な寸法、として設定した場合には、保持部材若しくは回動基盤の挿通孔内での電極チップの保持が、爪片の先端と電極チップに当接する挿通孔内周面の部位との対向する二点で挟持するとともに、一方を電極チップに食い込ませた態様とするため、安定して電極チップを保持することができる。
【００２０】
そして、この場合、爪片の食い込み領域への配置時における挿通孔の内周面の爪片と対向する部位に、凹部を形成しておけば、電極チップの保持時、爪片先端とともに、その凹部周縁の凸部も電極チップに食い込ませることができるため、一層、安定して電極チップを保持することができる。
【００２１】
また、爪片を、挿通孔の内周面の部位に、３か所以上放射状に配設させた場合には、電極チップに爪片を食い込ませる際、各爪の先端が、電極チップの外周面の周方向で、略均等に電極チップに食い込むこととなるため、電極チップの傾きが抑えられ、シャンクのテーパ軸の変形を極力抑えることが可能となる。
【００２２】
【発明の実施の形態】
以下、本発明の一実施形態を図面に基づいて説明する。
【００２３】
第１実施形態の抜き取り装置Ｍ１は、図１・２に示すように、抵抗溶接機としての溶接ロボットのシャンク１・２に取り付けられた電極チップ４を抜き取る装置であり、所定の作業ロボットにおける図示しないアームに連結保持される本体部１０と、本体部１０の上面側から水平方向に突出するように配設され、電極チップ４を抜き取る際に、シャンク１・２間に挿入されて、所定の電極チップ４に外装される先端部１３と、を備えて構成されている。なお、５は、シャンク１・２のテーパ軸３に嵌合される電極チップ４のテーパ孔である。
【００２４】
本体部１０は、図１〜３に示すように、ハウジング１１内に、後述する駆動ギヤ１２を正転・逆転させるための減速機付きの図示しない駆動モータを配設させて構成されている。
【００２５】
先端部１３は、ハウジング１１に連結固定されるケース１４と、ケース１４内に収納保持される保持部材２０及び回動基盤２７と、保持部材２０に保持される爪片２５と、駆動ギヤ１２に噛合して回動基盤２７を回動させるための中間ギヤ２９と、ブレーキ装置３１と、ケース１４の上下面にボルト止めされる２枚の押えリング１８と、を備えて構成されている。
【００２６】
回動基盤２７は、図３・４に示すように、中央に、電極チップ４の外径寸法より大きな内径寸法の挿通孔２７ａを中央に備えた略円板状として、外周面に中間ギヤ２９と噛み合う歯車部２７ｅが形成されるとともに、上・下面に円筒状のリブ２７ｆ・２７ｆが形成されている。回動基盤２７の回動中心Ｘは、挿通孔２７ａの中央で上下方向に設けられている。また、挿通孔２７ａの内周面には、爪片２５を配置可能な凹部２７ｂが形成されている。凹部２７ｂの一方の面は、図５に示すように、回動基盤２７の正転時に爪片２５の凸部２５ｄや側面２５ｅを押圧して、爪片先端２５ｂを電極チップ４へ食い込ませる食い込み領域まで、爪片２５を回転させる食い込み用押圧面２７ｃとしている。さらに、凹部２７ｂの他方の面が、回動基盤２７の逆転時に爪片２５の凸部２５ｆや側面２５ｇ（図９参照）を押圧して、爪片先端２５ｂを電極チップ４と干渉しない退避領域まで回転させる退避用押圧面２７ｄとしている。
【００２７】
爪片２５は、図３〜９に示す様に、略長方形板状の本体２５ａと、その上下の端面に形成される円柱状の支持軸２５ｈと、を備えて構成されている。本体２５ａの先端２５ｂは、鋭角状として、先端２５ｂの周囲には、電極チップ４との摩擦抵抗を高めるために、複数の凹溝２５ｃが形成されている。なお、第１実施形態の爪片２５は、上下の支持軸２５ｈが、先端２５ｂ側における保持部材２０の後述するリブ２２ｆの空間部２２ｉの部位に配置され、爪片２５の横断面形状として、回動基盤２７の凹部２７ｂから突出して挿通孔２７ａ内に侵入するとともに、リブ２２ｆの空間部２２ｉに侵入する形状とし、回動中心Ｘと平行となる支持軸２５ｈ・２５ｈを回動中心とする回動時、先端２５ｂが、保持部材２０の挿通孔２２ｊ内に突出可能な寸法に形成されている。さらに、本体２５ａの高さ寸法ｈ１（図３参照）は、後述する保持部材２０のリブ２２ｆの厚さ寸法ｔ１（図４参照）より僅かに小さく設定されている。
【００２８】
保持部材２０は、回動基盤２７と一致する回動中心Ｘを備えて、第１実施形態の場合、図３・４に示すように、円板状の平板部２１と、段付板部２２と、を備えて構成されている。
【００２９】
平板部２１は、回動基盤２７の上面側におけるリブ２７ｆの内周側で回動可能な外径寸法として、電極チップ４の外径より僅かに大きな内径寸法の挿通孔２１ａを中央に配置させている。平板部２１の厚さ寸法は、リブ２７ｆの高さ寸法より大きくされ、リブ２７ｆから突出した外周面が、後述するブレーキアーム３２の制動面２１ｇとしている。また、平板部２１の上面側の挿通孔２１ａの周縁には、上方から電極チップ４を挿入し易いように、テーパ面２１ｂが形成されている。さらに、挿通孔２１ａの周囲には、１つの支持孔２１ｃと、支持孔２１ｃを間にして２つずつの取付孔２１ｅと、が形成されている。取付孔２１ｅの内周には、下部側の内径を小さくして、段差面２１ｆが形成されている。
【００３０】
段付板部２２は、円板状の円板部２２ａと、円板部２２ａの上面から上方へ突出するリブ２２ｆと、を備えて構成されている。
【００３１】
円板部２２ａは、回動基盤２７の下面側におけるリブ２７ｆの内周側で回動可能な外径寸法として、電極チップ４の外径より僅かに大きな挿通孔２２ｂを中央に配置させている。円板部２２ａの厚さ寸法は、リブ２７ｆの高さ寸法と等しく設定され、下面側の挿通孔２２ｂの周縁には、下方から電極チップ４を挿入し易いように、テーパ面２２ｃが形成されている。また、円板部２２ａの挿通孔２２ｂの周囲には、平板部２１の支持孔２１ｃに対応して、支持孔２２ｄが形成されている。これらの支持孔２１ｃ・２２ｄには、爪片２５の上下面の支持軸２５ｈがそれぞれ嵌挿される。そして、第１実施形態の場合、各支持孔２１ｃ・２２ｄの内周面の内、回動中心Ｘを中心とした時計方向側の面が、回動基盤２７の正転時の回転トルクを受ける回転作用面２１ｄ・２２ｅとなる。
【００３２】
リブ２２ｆは、図３〜５に示すように、円板部２２ａの上面で、支持孔２２ｄの部位に空間部２２ｉを設けて、挿通孔２２ｂの周縁から上方へ突出する略円筒状としている。リブ２２ｆは、回動基盤２７の挿通孔２７ａに挿入可能な外径寸法とするとともに、内周側の挿通孔２２ｊの内径寸法ｄ１を、挿通孔２２ｂと等しくしている。挿通孔２２ｊの内周面における空間部２２ｉと対向する部位には、複数の凹部２２ｋが形成されている。さらに、リブ２２ｆの厚さ寸法（高さ寸法）ｔ１は、回動基盤２７におけるリブ２７ｆ・２７ｆの内周側の厚さ寸法ｔ０より僅かに大きい寸法としている。そして、リブ２２ｆの上端面には、平板部２１の取付孔２１ｅに対応して、４つのねじ孔２２ｇが形成されている。さらに、このリブ２２ｆの空間部２２ｉの一方の面には、図５〜８に示すように、食い込み領域に配置されるまでの爪片２５と干渉しないように、凹溝２２ｈが形成されている。
【００３３】
なお、保持部材２０の挿通孔２２ｊの内径寸法ｄ１は、爪片２５の食い込み領域への配置時、挿通孔２２ｂの内周面における爪片２５と対向する部位（凹部２２ｋ側部位）が、爪片２５で押圧された電極チップ４の外周面に圧接可能な寸法、として設定されている。ちなみに、実施形態の場合、挿通孔２２ｊの内径寸法ｄ１は、１７φとして、電極チップ４の外径寸法は、１６φとしている。
【００３４】
ケース１４は、上・下ケース１５・１６から構成され、これらの上・下ケース１５・１６は、図１〜４に示すように、先端側に、突条１５ｂ・１６ｂを内周面に突出させて、回動基盤２７の歯車部２７ｅの外径寸法に対応した貫通孔１５ａ・１６ａを備え、各突条１５ｂ・１６ｂには、それぞれ、押えリング１８を取り付けるための図示しないボルトを螺合させる６個ずつのねじ孔１５ｃ・１６ｃが形成されている。さらに、上・下ケース１５・１６には、本体部１０側の縁に、ボルトを利用して、相互に連結するための６個ずつの連結孔１５ｄ・１６ｄが形成されている。なお、連結孔１５ｄは単なる貫通孔とし、連結孔１６ｄがねじ孔としている。さらにまた、上・下ケース１５・１６には、中間ギヤ２９とブレーキ装置３１の後述するブレーキアーム３２とを回動可能に支持するための支持ボルト３３を取り付けるための取付孔１５ｅ・１６ｅを備えている。取付孔１５ｅは単なる貫通孔とし、取付孔１６ｅがねじ孔としている。そしてさらに、上下ケース１５・１６の対向面には、中間ギヤ２９をそれぞれ収納する収納凹部１５ｆ（図３参照）・１６ｆと、駆動ギヤ１２をそれぞれ収納する収納凹部１５ｇ（図示せず）・１６ｇ（図４参照）と、を備えて構成されている。収納凹部１６ｇは、貫通孔として構成されている。
【００３５】
押えリング１８は、回動基盤２７を回動可能とした状態で上・下ケース１５・１６内に収納させるためのものであり、図３・４に示すように、上・下ケース１５・１６の突条１５ｂ・１６ｂの内周側に挿入可能な円筒状の筒部１８ａと、筒部１８ａの端部側の外周面に形成された鍔部１８ｄと、を備えて構成されている。各鍔部１８ｄには、上・下ケース１５・１６のねじ孔１５ｃ・１６ｃに対応する取付孔１８ｅが形成されている。これらの押えリング１８は、それぞれ、各取付孔１８ｅを経てねじ孔１５ｃ・１６ｃに螺合される図示しないボルトによって、鍔部１８ｄを上・下ケース１５・１６の突条１５ｂ・１６ｂに当接させ、鍔部１８ｄから離れた筒部１８ａの端面１８ｃを対向させるように、上・下ケース１５・１６に取り付けられている。なお、各取付孔１８ｅは、上・下ケース１５・１６への取り付け状態で、ボルトが突出しないように、内周面にボルト頭部を受ける段差面を備えている。そして、上・下ケース１５・１６への取り付け状態で、各押えリング１８は、回動基盤２７を回動可能とした状態で筒部１８ａの内周面１８ｂで、回動基盤２７の円筒状のリブ２７ｆの外周面を規制するとともに、端面１８ｃ・１８ｃ間で、回動基盤２７の歯車部２７ｅの上下面を規制している。
【００３６】
ブレーキ装置３２は、一対のブレーキアーム３２と、付勢手段としての圧縮コイルばね３４と、を備えて構成されている。一対のブレーキアーム３２は、それぞれ、保持部材２０の平板部２１における制動面２１ｇを半分ずつ覆うような、半割り円板状の押圧片部３２ａを先端側に備えるとともに、中央部分を支持ボルト３３で回動可能に支持され、元部側に、相互の間に圧縮コイルばね３４を配設させるばね座３２ｂを配設させて構成されている。
【００３７】
先端部１３の組み立ては、まず、上・下ケース１５・１６間に回動基盤２７と中間ギヤ２９とを配設させた状態で、上・下ケース１５・１６に押えリング１８を図示しないボルトで取り付け、さらに、連結孔１５ｄ・１６ｄにボルトを挿通させて上・下ケース１５・１６相互を連結させる。その後、爪片２５を回動基盤２７の凹部２７ｂ内に配設させるとともに、その回動基盤２７の上下から、平板部２１と段付板部２２とを配置させる。詳しく述べると、リブ２２ｆを下方から挿通孔２７ａ内に挿入させるとともに、各取付孔２１ｅと各ねじ孔２２ｇとを対応させ、さらに、各支持孔２１ｃ・２２ｄに支持軸２５ｈを嵌挿させる。そして、各取付孔２１ｅを経て、各連結ボルト２３をねじ孔２２ｇに螺合させれば、平板部２１と段付板部２２とが連結されて保持部材２０が組み立てられるとともに、回動基盤２７を挿通するように、保持部材２０が、回動基盤２７内に配設される。そしてこの時、保持部材２０のリブ２２ｆの高さ寸法ｔ１が、爪片２５の本体２５ａの高さ寸法ｈ１や、回動基盤２７におけるリブ２７ｆ・２７ｆの内周側の厚さ寸法ｔ０より、僅かに大きい寸法としていることから、爪片２５が支持軸２５ｈを回動中心として回動可能に保持部材２０に保持され、保持部材が、リブ２７ｆ等で規制されて、回動基盤２７と回動中心Ｘを一致させて、回動基盤２７と相対回転可能に、ケース１４内に配設されることとなる。
【００３８】
その後、ばね座３２ｂ・３２ｂ間に圧縮コイルばね３４を配設した状態で、押圧片部３２ａ・３２ａを保持部材２０の平板部２１における制動面２１ｇに当接させて、支持ボルト３３を利用して、一対のブレーキアーム３２・３２をケース１４に取り付ければ、先端部１３を組み立てることができる。なお、先端部１３を組み立てた後は、中間ギヤ２９と駆動ギヤ１２とを噛合させつつ、先端部１３を本体部１０に組み付ければ良い。
【００３９】
この第１実施形態の抜き取り装置Ｍ１では、電極チップ４の抜き取り時、まず、電極チップ４を、回動基盤２７の挿通孔２７ａと同心的に配置された保持部材２０の挿通孔２１ａ・２２ｂ内に挿入させるように、電極チップ４に回動基盤２７を外装させ、ついで、本体部１０内の駆動モータを駆動させて、駆動ギヤ１２と中間ギヤ２９とを利用して、図５〜７に示すように、回動基盤２７を、回動中心Ｘを基準に、時計方向に正転させる。
【００４０】
すると、図５〜７に示すように、回動基盤２７の食い込み用押圧面２７ｃが、爪片２５の凸部２５ｄや側面２５ｅに当接して、支持軸２５ｈを回転中心として爪片２５を時計方向に回転させ、そして、図８に示すように、爪片２５を食い込み領域まで回転させることから、爪片２５の先端２５ｂが、電極チップ４を挿通孔２２ｊ内で保持可能に、電極チップ４の外周面に食い込む。
【００４１】
この時、第１実施形態の場合には、電極チップ４は、爪片２５の先端２５ｂに食い込まれて僅かに傾斜し、挿通孔２２ｊの凹部２２ｋ側部位に圧接されることとなる。
【００４２】
この状態で、さらに回動基盤２７が正転すれば、爪片２５の先端２５ｂが、電極チップ４の中心方向側へ向く態様となって、電極チップ４へ深く食い込み、爪片２５の食い込み抵抗が増大する。すると、爪片２５が回転し難くなって、回転基盤２７の回転トルクが、爪片２５の支持部位である回転作用面２１ｄ・２２ｅに作用し、保持部材２０が、ブレーキアーム３２・３２の回転制動力に抗して、回動基盤２７とともに正転することとなる。
【００４３】
この時、保持部材２０が、爪片２５を電極チップ４に食い込ませて電極チップ４を挿通孔２２ｊ内で保持した状態で、回転するため、電極チップ４が、回動基盤２７の正転方向に回転する。そして、電極チップ４が僅かでも回転すれば、シャンク１のテーパ軸３との電極チップ４の嵌合状態が解除される。そのため、その後、本体部１０とともに先端部１３を、シャンク１の先端側である下方に移動させれば、電極チップ４をシャンク１から抜き取ることができる。
【００４４】
その後、先端部１３を図示しない回収箱の上方に配置させた後、本体部１０側の駆動モータを逆駆動させて、回動基盤２７を回動中心Ｘを基準に反時計方向に逆転させる。すると、図９に示すように、回動基盤２７の退避用押圧面２７ｄが、爪片２５の凸部２５ｆや側面２５ｇに当接して、支持軸２５ｈを回転中心として爪片２５を反時計方向に回転させ、爪片２５の先端２５ｂが、挿通孔２２ｊ内での電極チップ４の保持を解除する退避領域に配置される。
【００４５】
すると、電極チップ４は、爪片先端２５ｂの食い込みが解消されるとともに、挿通孔２２ｊの内周面における凹部２２ｋ側部位への圧接力が解消されて、保持部材２０の挿通孔２２ｊや回動基盤２７の挿通孔２７ａから落下して、回収箱に収容することができる。
【００４６】
なお、この回動基盤２７の逆転は、爪片２５の食い込み抵抗が低減される方向の回転であり、保持部材２０は、制動面２１ｇにブレーキアーム３２・３２の押圧片部３２ａの回転制動力が作用されていることから、回転せず、回動基盤２７の逆転では、爪片２５だけが退避領域に回動することとなる。
【００４７】
また、下方のシャンク２の電極チップ４も、先端部１３を外装させ、回動基盤２７を正転させた後、先端部１３を所定位置に移動させ、さらに、回動基盤２７を逆転させれば、上方のシャンク１の電極チップ４と同様に、容易に回収箱に収容することができる。
【００４８】
したがって、第１実施形態の抜き取り装置Ｍ１では、電極チップ４付近に配置される部位が、回動基盤２７、爪片２５を保持した保持部材２０、これらを収納したケース１４、及び、ブレーキアーム３２・３２等であって、さらに、電極チップ４を外す際の回転機構自体が、抜き取った電極チップ４を保持する機構と兼用であるため、薄く構成できて、シャンク１・２間の狭い部位に嵌合された電極チップ４でも容易に抜き取ることができる。また、抜き取り作業時には、単に、爪片２５の先端２５ｂを電極チップ４に食い込ませるだけであって、衝突するような衝撃音が発生せず、作業時の音の発生を極力抑えることができる。
【００４９】
そして、第１実施形態では、保持部材２０を、回動基盤２７の挿通孔２７ａを挿通するように配設させるとともに、平板部２１の端部２１ｇを回動基盤２７から突出させ、保持部材２０に付加される回転制動力を、その外周面２１ｇに摩擦抵抗を加えるように、圧縮コイルばね３４を利用して外周面２１ｇに押圧されるブレーキアーム３２・３２により、生じさせる構成としている。そのため、ブレーキアーム３２・３２を外周面２１ｇの高さ寸法以内に抑えることが可能となり、さらに、ブレーキアーム３２以外のブレーキ装置３１の部位を、電極チップ４の近傍部位から離すことができることから、ブレーキ装置３１を設けていても、抜き取り装置Ｍ１における電極チップ４の近傍部位の厚さを厚くせずに薄くすることが可能となり、一層、シャンク１・２間の狭い部位に嵌合された電極チップ４でも容易に抜き取ることができる。
【００５０】
さらに、第１実施形態では、爪片２５を、１つとして、保持部材２０の挿通孔２２ｊの内径寸法ｄ１が、爪片２５の食い込み領域への配置時、その挿通孔２２ｊの内周面における爪片２５と対向する凹部２２ｋ側部位に、爪片２５で押圧された電極チップ４の外周面を圧接可能な寸法、として設定されている。そのため、保持部材２０の挿通孔２２ｊ内での電極チップ４の保持が、爪片２５の先端２５ｂと電極チップ４に当接する挿通孔２２ｊの内周面の凹部２２ｋ側部位との対向する二点で挟持するとともに、一方の爪片先端２５ｂを電極チップ４に食い込ませた態様としているため、安定して電極チップ４を保持することができる。
【００５１】
そしてさらに、第１実施形態の場合、爪片２５の食い込み領域への配置時における挿通孔２２ｊの内周面の爪片２５と対向する部位に、凹部２２ｋが形成されており、電極チップ４の保持時、爪片先端２５ｂとともに、その凹部２２ｋ周縁の凸部２２ｌも電極チップ４に食い込ませることができるため、一層、安定して電極チップ４を保持することができる。
【００５２】
なお、第１実施形態では、爪片先端２５ｂと保持部材２０の挿通孔２２ｊの内周面とで、挟持するように、電極チップ４を保持する構成を示したが、後述するように、爪片先端２５ｂと回動基盤２７の挿通孔２７ａの内周面とで、電極チップ４を保持するように構成しても良い。
【００５３】
また、図１０〜１３に示す第２実施形態の抜き取り装置Ｍ２のように、爪片４５だけで、電極チップ４を保持するように構成しても良い。
【００５４】
第２実施形態の抜き取り装置Ｍ２は、爪片４５、爪片４５を保持する保持部材４０、及び、回動基盤４７が、第１実施形態と相違する他、上・下ケース１５・１６からなるケース１４、押えリング１８・１８、中間ギヤ２９、ブレーキ装置３１、駆動ギヤ１２、本体部１０は、第１実施形態と同一部材であり、これらの同一部材の説明は、省略する。
【００５５】
回動基盤４７は、図１２〜１４に示すように、中央に、電極チップ４の外径寸法より僅かに大きな内径寸法の挿通孔４７ａを中央に備えた略円板状として、外周面に、中間ギヤ２９と噛み合って上・下ケース１５・１６の貫通孔１５ａ・１６ａ内に収納されるとともに、上下の押えリング１８の筒部端面１８ｃ・１８ｃ間で回動可能に上下方向に規制される歯車部４７ｅが形成されている。回動基盤４７の回動中心Ｘは、挿通孔４７ａの中央で上下方向に設けられている。また、回動基盤４７の上・下面には、押えリング１８の筒部１８ａの内周面に摺動可能に規制される円筒状のリブ４７ｆ・４７ｆが形成されている。さらに、挿通孔４７ａの内周面には、それぞれ、３つの爪片４５をそれぞれ配置可能な凹部４７ｂが、放射状に均等間隔で形成されている。各凹部４７ｂでは、それぞれ、一方の面が、回動基盤４７の正転時に爪片４５の凸部４５ｃや側面４５ｄを押圧して、爪片先端４５ｂを電極チップ４へ食い込ませる食い込み領域まで、爪片４５を回転させる食い込み用押圧面４７ｃとしている。さらに、各凹部４７ｄのそれぞれの他方の面が、図１７に示すように、回動基盤４７の逆転時に爪片４５の凸部４５ｅや側面４５ｆを押圧して、爪片先端４５ｂを電極チップ４と干渉しない退避領域まで回転させる退避用押圧面４７ｄとしている。
【００５６】
また、第２実施形態の回動基盤４７は、それぞれの凹部４７ｂ間に、回動基盤４７の回動中心Ｘを中心とした円弧状の案内孔４７ｇが形成されている。これらの案内孔４７ｇは、回動基盤４７に対する保持部材４０の相対回転を案内するものである。
【００５７】
各爪片４５は、図１２〜１４に示すように、略長方形板状の本体４５ａと、その上下の端面に形成される円柱状の支持軸４５ｇと、を備えて構成されている。本体４５ａの先端４５ｂは、鋭角状に形成されている。なお、第２実施形態の各爪片４５は、上下の支持軸４５ｇを元部側（凸部４５ｃ・４５ｅ（図１５・１７参照）側）と先端４５ｂ側との間の略中央に配置させ、回動中心Ｘと平行となる支持軸４５ｇ・４５ｇを回動中心とする回動時、回動基盤４７の挿通孔４７ａ内に先端４５ｂを突出可能な寸法に形成されている。本体４５ａの高さ寸法ｈ２（図１２参照）は、後述する保持部材４０のスペーサ４３の高さ寸法ｈ３（図１３参照）より僅かに小さく設定されている。
【００５８】
保持部材４０は、回動基盤４７と一致する回動中心Ｘを備えて、第２実施形態の場合、図１２・１３に示すように、２枚の円板状の平板部４１・４２と、３本のスペーサ４３と、を６本の連結ボルト４４で連結させて構成されている。
【００５９】
平板部４１・４２は、それぞれ、回動基盤４７の上下面のリブ４７ｆの内周側で回動可能な外径寸法として、電極チップ４の外径寸法より僅かに大きくして回動基盤４７の挿通孔４７ａと等しくした内径寸法の挿通孔４１ａ・４２ａを中央に配置させている。各平板部４１・４２の外面側の挿通孔４１ａ・４２ａの周縁には、それぞれ、上下方向から電極チップ４を挿入し易いように、テーパ面４１ｂ・４２ｂが形成されている。さらに、平板部４１・４２は、各挿通孔４１ａ・４２ａの周囲に、相互に対向するように、３個ずつの支持孔４１ｃ・４２ｃと取付孔４１ｅ・４２ｅとが、それぞれ、同心的かつ放射状に形成されている。支持孔４１ｃ・４２ｃは、各爪片４５の上下の支持軸４５ｇを嵌挿させて、各爪片４５を回動可能に保持する部位となるとともに、その内周面の一部が、正転時の回動基盤４７とともに回転する際の回転トルクを受ける回転作用面４１ｄ・４２ｄとしている。ちなみに、受面４１ｄ・４２ｄは、第２実施形態の場合、各支持孔４１ｃ・４２ｃの内周面における回動基盤４７の回動中心Ｘを中心とした際の反時計方向の側の面としている。各取付孔４１ｅ・４２ｅは、内部側の内径を小さくして、連結ボルト４４の頭部と当接する段差面を備えている。
【００６０】
そして、平板部４１の厚さ寸法ｔ２（図１３参照）が、回動基盤４７の上面側におけるリブ４７ｆの高さ寸法ｈ４（図１２参照）より大きくされ、リブ４７ｆから突出した外周面が、ブレーキアーム３２・３２における押圧片部３２ａの制動面４１ｆとしている。また、平板部４２の厚さ寸法は、回動基盤４７の下面側におけるリブ４７ｆの高さ寸法と等しくされている。
【００６１】
各スペーサ４３は、回動基盤４７の各案内孔４７ｇに挿入可能な外径寸法とした円筒形状として、内周側には、連結ボルト４４に対応したねじ孔４３ａが形成されている。各スペーサ４３の高さ寸法ｈ３（図１３参照）は、既述したように、各爪片４５の本体４５ａの高さ寸法ｈ２より僅かに大きく、さらに、回動基盤４７におけるリブ４７ｆ・４７ｆの内周側の厚さ寸法ｔ３より、僅かに大きい寸法に設定されている。
【００６２】
第２実施形態の先端部１３の組み立てについて述べると、まず、上・下ケース１５・１６間に回動基盤４７と中間ギヤ２９とを配設させた状態で、上・下ケース１５・１６に押えリング１８を図示しないボルトで取り付け、さらに、連結孔１５ｄ・１６ｄにボルトを挿通させて上・下ケース１５・１６相互を連結させる。その後、各爪片４５を回動基盤４７の各凹部４７ｂ内に配設させるとともに、各スペーサ４３を回動基盤４７の各案内孔４７ｇに配設させて、回動基盤４７の上下から、平板部４１・４２を配置させる。そして、各取付孔４１ｅ・４２ｅと各スペーサ４３のねじ孔４３ａとを対応させ、さらに、各支持孔４１ｃ・４２ｃに支持軸４５ｇを嵌挿させる。その後、各取付孔４１ｅ・４２ｅを経て、各連結ボルト４４をねじ孔４３ａに螺合させれば、平板部４１・４２と３つのスペーサ４３とが連結されて保持部材４０が組み立てられるとともに、回動基盤４７を挿通するように、保持部材４０が、回動基盤４７内に配設される。
【００６３】
そしてこの時、保持部材４０の各スペーサ４３の高さ寸法ｈ３が、各爪片４５の本体４５ａの高さ寸法ｈ２や、回動基盤４７におけるリブ４７ｆ・４７ｆの内周側の厚さ寸法ｔ３より、僅かに大きい寸法としていることから、各爪片４５が支持軸４５ｇを回動中心として回動可能に保持部材４０に保持され、保持部材４０が、リブ４７ｆや案内孔４７ｇ等で規制されて、回動基盤４７と回動中心Ｘを一致させて、回動基盤４７と相対回転可能に、ケース１４内に配設されることとなる。
【００６４】
その後、ばね座３２ｂ・３２ｂ間に圧縮コイルばね３４を配設した状態で、押圧片部３２ａ・３２ａを保持部材４０の平板部４１における制動面４１ｆに当接させて、支持ボルト３３を利用して、一対のブレーキアーム３２・３２をケース１４に取り付ければ、第２実施形態の先端部１３を組み立てることができる。
【００６５】
先端部１３を組み立てた後は、中間ギヤ２９と駆動ギヤ１２とを噛合させつつ、先端部１３を本体部１０に組み付ければ良い。
【００６６】
この第２実施形態の抜き取り装置Ｍ２では、電極チップ４の抜き取り時、まず、電極チップ４を、回動基盤４７の挿通孔４７ａ内に挿入させるように、電極チップ４に回動基盤４７を外装させ、ついで、本体部１０内の駆動モータを駆動させて、駆動ギヤ１２と中間ギヤ２９とを利用して、図１４・１５に示すように、回動基盤４７を、回動中心Ｘを基準に、反時計方向に正転させる。
【００６７】
すると、図１４・１５に示すように、回動基盤４７の各食い込み用押圧面４７ｃが、各爪片４５の凸部４５ｃや側面４５ｄに当接して、支持軸４５ｇを回転中心として各爪片４５を反時計方向に回転させ、そして、図１６に示すように、各爪片４５を食い込み領域まで回転させることから、各爪片４５の先端４５ｂが、電極チップ４を挿通孔４７ａ内で保持可能に、電極チップ４の外周面に食い込む。
【００６８】
この状態で、さらに回動基盤４７が正転すれば、各爪片４５の先端４５ｂが、電極チップ４の中心方向側へ向く態様となって、電極チップ４へ深く食い込み、各爪片４５の食い込み抵抗が増大する。すると、各爪片４５が回転し難くなって、回転基盤４７の回転トルクが、各爪片４５の支持部位である回転作用面４１ｄ・４２ｄに作用し、保持部材４０が、ブレーキアーム３２・３２の回転制動力に抗して、回動基盤４７とともに正転することとなる。
【００６９】
この時、保持部材４０が、各爪片４５を電極チップ４に食い込ませて電極チップ４を挿通孔４７ａ内で保持した状態で、回転するため、電極チップ４が、回動基盤４７の正転方向の反時計方向に回転する。そして、電極チップ４が僅かでも回転すれば、シャンク１のテーパ軸３との電極チップ４の嵌合状態が解除される。そのため、その後、本体部１０とともに先端部１３を、シャンク１の先端側である下方に移動させれば、電極チップ４をシャンク１から抜き取ることができる。
【００７０】
その後、先端部１３を図示しない回収箱の上方に配置させた後、本体部１０側の駆動モータを逆駆動させて、回動基盤４７を回動中心Ｘを基準に時計方向に逆転させる。すると、図１７に示すように、回動基盤４７の各退避用押圧面４７ｄが、各爪片４５の凸部４５ｅや側面４５ｆに当接して、支持軸４５ｇを回転中心として各爪片４５を時計方向に回転させ、各爪片４５の先端４５ｂが、挿通孔４７ａ内での電極チップ４の保持を解除する退避領域に配置される。
【００７１】
すると、電極チップ４は、各爪片先端４５ｂの食い込みが解消されて、回動基盤４７の挿通孔４７ａから落下して、回収箱に収容することができる。
【００７２】
なお、この回動基盤４７の逆転も、爪片４５の食い込み抵抗が低減される方向の回転であり、保持部材４０は、制動面４１ｆにブレーキアーム３２・３２の押圧片部３２ａの回転制動力が作用されていることから、回転せず、回動基盤４７の逆転では、爪片４５だけが退避領域に回動することとなる。
【００７３】
また、下方のシャンク２の電極チップ４も、先端部１３を外装させ、回動基盤４７を正転させた後、先端部１３を所定位置に移動させ、さらに、回動基盤４７を逆転させれば、上方のシャンク１の電極チップ４と同様に、容易に回収箱に収容することができる。
【００７４】
したがって、第２実施形態の抜き取り装置Ｍ２でも、電極チップ４付近に配置される部位が、回動基盤４７、爪片４５を保持した保持部材４０、これらを収納したケース１４、及び、ブレーキアーム３２・３２等であって、さらに、電極チップ４を外す際の回転機構自体が、抜き取った電極チップ４を保持する機構と兼用であるため、薄く構成できて、シャンク１・２間の狭い部位に嵌合された電極チップ４でも容易に抜き取ることができる。また、抜き取り作業時には、単に、各爪片４５の先端４５ｂを電極チップ４に食い込ませるだけであって、衝突するような衝撃音が発生せず、作業時の音の発生を極力抑えることができる。
【００７５】
そして、第２実施形態でも、保持部材４０を、回動基盤４７を挿通するように配設させるとともに、平板部４１の端部４１ｆを回動基盤４７から突出させ、保持部材４０に付加される回転制動力を、その外周面４１ｆに摩擦抵抗を加えるように、圧縮コイルばね３４を利用して外周面４１ｆに押圧されるブレーキアーム３２・３２により、生じさせる構成としている。そのため、ブレーキアーム３２・３２を外周面４１ｆの高さ寸法以内に抑えることが可能となり、さらに、ブレーキアーム３２以外のブレーキ装置３１の部位を、電極チップ４の近傍部位から離すことができることから、ブレーキ装置３１を設けていても、抜き取り装置Ｍ２における電極チップ４の近傍部位の厚さを厚くせずに薄くすることが可能となり、一層、シャンク１・２間の狭い部位に嵌合された電極チップ４でも容易に抜き取ることができる。
【００７６】
さらに、第２実施形態では、各爪片４５を、回動基盤４７の挿通孔４７ａの内周面の部位に、放射状に３箇所配設させている。そのため、電極チップ４に爪片４５の先端４５ｂを食い込ませる際、各爪片先端４５ｂが、電極チップ４の周方向で、略均等に電極チップ４に食い込むこととなり、電極チップ４の傾きを抑えて、シャンク１・２にテーパ軸３の変形を極力抑えることができる。
【００７７】
なお、第２実施形態では、爪片４５を、回動基盤４７の挿通孔４７ａの内周面の部位に、放射状に、３箇所配設させているものを示したが、挿通孔４７ａの内周面の部位に、放射状に４箇所以上設けても良い。
【００７８】
また、第１実施形態の変形態様として、第２実施形態のものに比べて先端４５ｂを僅かに長く突出させた爪片４５を、１つとして、その爪片４５に対向する挿通孔４７の内周面の部位に、電極チップへの爪片先端の食い込み時、電極チップ４の外周面を圧接させるようにしても良い。
【００７９】
さらに、第１実施形態の変形例として、第２実施形態の爪片４５・４５を２つ使用して、残りの爪片４５の部位の凹部４７ｂを無くして、その凹部を無くして充填されたような部位に、電極チップへの爪片先端の食い込み時、電極チップ４の外周面を圧接させるようにしても良い。
【００８０】
さらにまた、第１・２実施形態の保持部材２０・４０に対するブレーキアーム３２・３２の回転制動力に関し、爪片２５・４５の先端２５ｂ・４５ｂが電極チップ４へ深く食い込み、爪片２５・４５の食い込み抵抗が増大し、爪片２５・４５が回転し難くなって、回転基盤２７・４７の回転トルクが、爪片２５・４５の支持部位である回転作用面２１ｄ・２２ｅ・４１ｄ・４２ｄに作用し、保持部材２０・４０が、ブレーキアーム３２・３２の回転制動力に抗して、回動基盤２７・４７とともに正転する必要がある。そのため、各爪片２５・４５の先端２５ｂ・４５ｂが電極チップ４の中心方向に完全に向く前に（電極チップ４に一番食い込む前に）、保持部材２０・４０が回動基盤２７・４７とともに正転できるようにするために、ブレーキアーム３２・３２の回転制動力が、大きくなり過ぎないように、ばね３４の付勢力で調整しておく必要がある。
【図面の簡単な説明】
【図１】本発明の第１実施形態の抜き取り装置の平面図である。
【図２】同実施形態の正面図である。
【図３】図１の III− III部位の拡大縦断面図である。
【図４】同実施形態の概略分解斜視図である。
【図５】同実施形態の抜き取り作業時における回動基盤の正転直前の状態を示す要部横断面図である。
【図６】同実施形態の抜き取り作業時における回動基盤の正転直後の状態を示す要部横断面図である。
【図７】同実施形態の抜き取り作業時における図６の後の状態を示す要部横断面図である。
【図８】同実施形態の抜き取り作業時における保持部材の回転直前の状態を示す要部横断面図である。
【図９】同実施形態の回動基盤の逆転時の状態を示す要部横断面図である。
【図１０】第２実施形態の抜き取り装置の平面図である。
【図１１】同実施形態の正面図である。
【図１２】図１０の XII− XII部位の拡大縦断面図である。
【図１３】同実施形態の概略分解斜視図である。
【図１４】同実施形態の抜き取り作業時における回動基盤の正転直前の状態を示す要部横断面図である。
【図１５】同実施形態の抜き取り作業時における回動基盤の正転後の状態を示す要部横断面図である。
【図１６】同実施形態の抜き取り作業時における保持部材の回転直前の状態を示す要部横断面図である。
【図１７】同実施形態の回動基盤の逆転時の状態を示す要部横断面図である。
【符号の説明】
１・２…シャンク、
３…テーパ軸、
４…電極、
２０・４０…保持部材、
２１ａ・２２ｂ・２２ｊ・４１ａ・４２ａ…挿通孔、
２１ｃ・２２ｄ・４１ｃ・４２ｃ…支持孔、
２１ｄ・２２ｅ・４１ｄ・４２ｄ…回転作用面、
２１ｄ・４１ｆ…制動面、
２２ｋ…凹部、
２５・４５…爪片、
２５ｂ・４５ｂ…先端、
２５ｈ・４５ｇ…（回動軸）支持軸、
２７・４７…回動基盤、
２７ａ・４７ａ…挿通孔、
２７ｃ・４７ｃ…食い込み用押圧面、
２７ｄ・４７ｄ…退避用押圧面、
３１…ブレーキ装置、
３２…ブレーキアーム、
３４…（付勢手段）圧縮コイルばね。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrode tip extracting device for extracting an electrode tip from a shank when replacing an electrode tip fitted to a taper shaft in a shank of a resistance welder.
[0002]
[Prior art and its problems]
Conventionally, as this kind of extraction device, an expansion member or a wedge is driven into a portion between the shank and the electrode tip, and the electrode tip is separated from the shank, so that the electrode tip is extracted or detached from the shank. As described above, there has been a device for removing the electrode tip by applying a fine blow to the electrode tip (see JP-A-3-291175, JP-A-4-9285, etc.).
[0003]
However, the type in which the expansion member or wedge is driven is inserted through the entire length of the electrode tip, the expansion portion or wedge portion is arranged between the shank and the electrode tip, and a mechanism for holding the extracted electrode tip is provided on the electrode. Since it is necessary to dispose near the tip of the tip, the thickness of the portion disposed near the electrode tip is thick, and it is difficult to use it for a welding robot or the like having a small space between the shanks disposed above and below.
[0004]
Further, in the type of hitting, when hitting the electrode tip, a collision sound is generated many times, and there is a possibility that it becomes noise.
[0005]
The present invention solves the above-mentioned problem, can reduce the thickness of the portion to be arranged in the vicinity of the electrode tip, can be easily extracted even with the electrode tip fitted in a narrow portion between the shanks, It is an object of the present invention to provide an electrode tip extraction device that can suppress generation of sound during operation.
[0006]
[Means for Solving the Problems]
  The extraction device according to the present invention is an electrode tip extraction device that rotates and extracts an electrode tip fitted to a taper shaft in a shank of a resistance welder,
  A rotation base that is housed and held in a case so as to be able to rotate forward and reverse, and has an insertion hole into which the electrode tip can be inserted at the center of rotation,
  It is arranged on the inner peripheral surface of the insertion holeTheRotating shaft parallel to the axial direction of the insertion holeThe supporting shaft to be configured is protruded from both end faces of the substantially rectangular plate-shaped main body, and the tip on the electrode tip side inserted into the insertion hole is formed in an acute angle shape,When rotating, the electrode tip can be held in the insertion hole.SaidTip, Rotate to the center direction side of the electrode tip,The region that bites into the outer peripheral surface of the electrode tip, and the holding of the electrode tip in the insertion hole can be released,SaidTip, By rotating in the direction opposite to the direction of biting into the outer peripheral surface of the electrode tip,Claw pieces that are held so as to be displaceable from the retreat area to be detached from the outer peripheral surface of the electrode tip, and
  A rotation center coinciding with the rotation base is provided, the rotation base is inserted, and an end is protruded from the rotation base, and the electrode tip is disposed at the rotation center. It has an insertion hole that can be inserted,Insert the support shaftA holding member that is housed and held in the case so as to be rotatable relative to the rotation base and to be rotatable in response to a rotational braking force.
  A brake device for applying a rotational braking force to the holding member;
  Configured with
  When the rotating base rotates forward, the claw pieceWhile rotating in the same direction as the rotation direction of the rotation base, the support shaft as a rotation axis,The pressing surface for biting to press and rotate to the biting area, and the claw piece at the time of reverse rotation, While rotating in the same direction as the reverse direction of the rotation base, with the support shaft as a rotation axis,A retraction pressing surface that is pressed and rotated to the retreat area, and
  The brake device includes a brake arm supported by the case so that the holding member can be pressed against the outer peripheral surface of the holding member so as to apply a frictional resistance to the outer peripheral surface of the holding member protruding from the rotating base. ,
  The rotational braking force applied to the holding member is made by the brake arm, and when the biting resistance of the claw piece is increased when the claw piece is arranged in the biting area,Before the tip of the claw piece is completely oriented toward the center of the electrode tip,Of the nail piecesThe support shaft is inserted.The support portion is set as a rotation action surface, and is set to have a size that allows the holding member to rotate together with the rotation base by receiving a rotation torque during normal rotation of the rotation base.
  The inner diameter of the holding member or the insertion hole of the rotating base can be pressed against the inner peripheral surface of the outer peripheral surface of the electrode tip pressed by the claw piece when the claw piece is arranged in the biting area. And when the claw piece is disposed in the biting area, the tip of the claw piece, and the inner peripheral surface of the insertion hole of the holding member or the rotation base pressed against the electrode chip Thus, one or two claw pieces are arranged so as to be able to hold the electrode tip.
  Alternatively, when the nail pieces are arranged in the biting area, the nail pieces are arranged radially at three or more locations on the inner peripheral surface of the insertion hole so that the electrode tips can be held only by the tips of the nail pieces. It arranges in.
[0012]
【The invention's effect】
In the extraction device according to the present invention, when extracting the electrode chip, first, the electrode chip is externally mounted so that the electrode chip is inserted into the insertion hole of the rotation board, and then the rotation board is rotated forward. .
[0013]
Then, the biting pressing surface of the rotating base abuts on the nail piece and rotates the nail piece to the biting area, so that the tip of the nail piece can hold the electrode tip in the insertion hole, and the outer periphery of the electrode tip Cut into the surface.
[0014]
  And furthermore, the rotation base is forward rotationThis will increase the resistance to biting the nail pieces,Holding memberWith the support part of the claw piece as a rotational action surface, it receives rotational torque during normal rotation of the rotation base,Rotate forward with rotating baseThe
  That is, the holding member isIn the state where the nail pieces are bitten into the electrode tips and the electrode tips are held in the insertion holes, the nail pieces rotate together with the nail pieces, so that the electrode tips rotate in the normal rotation direction of the rotation base. If the electrode tip rotates even a little, the fitting state of the electrode tip with the taper shaft of the shank is released. Therefore, the electrode tip can be removed from the shank by moving the rotation base, the holding member, and the like to the tip end side of the shank.
[0015]
  After placing the pivot base and holding member in place,Reverse the rotating base. Then, the retraction pressing surface of the rotating base comes into contact with the claw piece, and further, the claw piece is rotated, and the tip of the claw piece is arranged in the retraction area where the holding of the electrode chip in the insertion hole is released. Then, the electrode tip can be dropped from the insertion hole of the rotating base and accommodated in a predetermined position.The reversal of the rotating base is a rotation in a direction in which the biting resistance of the claw piece is reduced, and the holding member does not rotate by receiving the rotational braking force. It will rotate to the retreat area.
[0016]
Therefore, in the extraction device according to the present invention, the portion arranged in the vicinity of the electrode tip is a rotation base, a holding member holding the claw piece, and the rotation mechanism itself when removing the electrode tip Since this is also used as a mechanism for holding the electrode tip, the electrode tip can be made thin, and even an electrode tip fitted in a narrow portion between shanks can be easily extracted. Further, at the time of the extraction work, the claw piece is simply digged into the electrode chip, and no impact sound such as a collision is generated, and the generation of sound during the work can be suppressed as much as possible.
[0017]
AndA brake device that applies a rotational braking force to the holding member is arranged so that the rotational braking force applied to the holding member increases the biting resistance of the claw piece when it is placed in the biting area of the claw piece. If the rotation action surface is set to a size that allows the holding member to rotate together with the rotation base by receiving the rotational torque during normal rotation of the rotation base, the claw pieces can be rotated with the electrode chip biting into the electrode tip. When the moving base rotates forward, the biting resistance of the claw piece increases, and even when the holding member receives the rotational braking force of the brake device, the support part of the claw piece is used as the rotating action surface during the normal rotation of the rotating base. , And can rotate forward together with the rotating base against the rotational braking force. Further, when the rotation base is subsequently reversed, the claw pieces are rotated in a direction in which the biting resistance of the claw pieces is reduced. Is the evacuation area Will be rotated.
[0018]
in this case,The holding member is disposed so as to be inserted through the rotating base, and the end portion is protruded from the rotating base,In the brake device,A brake arm that is pressed against the outer peripheral surface of the holding member by the biasing means so as to apply a frictional resistance to the outer peripheral surface of the holding member protruding from the rotating base.The brake arm has a rotational braking force applied to the holding member.The brake arm can be suppressed within the thickness of the holding member, and the brake device other than the brake arm can be separated from the vicinity of the electrode tip. Even if a device is provided, it is possible to reduce the thickness of the portion near the electrode tip in the extraction device without increasing the thickness, and even an electrode tip fitted in a narrow portion between shanks can be easily extracted. it can.
[0019]
Furthermore, with one claw piece, when the inner diameter dimension of the holding member or the rotation base insertion hole is arranged in the biting area of the claw piece, on the part facing the claw piece on the inner peripheral surface of the insertion hole, When the outer peripheral surface of the electrode tip pressed by the nail piece is set as a size that can be pressed, the holding of the electrode tip in the insertion hole of the holding member or the rotation base is applied to the tip of the nail piece and the electrode tip. While sandwiching at two points facing the part of the inner peripheral surface of the insertion hole that comes into contact, and having one of the two bites into the electrode chip, the electrode chip can be stably held.
[0020]
And in this case, if a recess is formed in the part facing the nail piece on the inner peripheral surface of the insertion hole when the nail piece is placed in the biting area, when holding the electrode chip, Since the convex part at the periphery of the concave part can also be bitten into the electrode chip, the electrode chip can be held more stably.
[0021]
In addition, when the nail pieces are arranged radially at three or more locations on the inner peripheral surface of the insertion hole, when the nail pieces are bitten into the electrode tip, the tip of each nail is attached to the outer periphery of the electrode tip. Since it bites into the electrode tip substantially evenly in the circumferential direction of the surface, the inclination of the electrode tip can be suppressed, and the deformation of the taper shaft of the shank can be suppressed as much as possible.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0023]
As shown in FIGS. 1 and 2, the extraction device M1 according to the first embodiment is an apparatus for extracting the electrode tips 4 attached to the shanks 1 and 2 of a welding robot as a resistance welding machine. The main body 10 is connected to and held by the arm that is not connected, and is disposed so as to protrude in the horizontal direction from the upper surface side of the main body 10. When the electrode tip 4 is extracted, it is inserted between the shanks 1 and 2 and is And a tip portion 13 that is externally mounted on the electrode chip 4. In addition, 5 is a taper hole of the electrode tip 4 fitted to the taper shaft 3 of the shanks 1 and 2.
[0024]
As shown in FIGS. 1 to 3, the main body 10 is configured by disposing a drive motor (not shown) with a speed reducer for rotating a drive gear 12, which will be described later, forward and reverse in a housing 11.
[0025]
The distal end portion 13 is connected to the case 14 connected and fixed to the housing 11, the holding member 20 and the rotating base 27 stored and held in the case 14, the claw pieces 25 held by the holding member 20, and the drive gear 12. An intermediate gear 29 for meshing and rotating the rotation base 27, a brake device 31, and two presser rings 18 bolted to the upper and lower surfaces of the case 14 are configured.
[0026]
As shown in FIGS. 3 and 4, the rotation base 27 is formed in a substantially disc shape with an insertion hole 27a having an inner diameter larger than the outer diameter of the electrode tip 4 in the center, and an intermediate gear 29 on the outer peripheral surface. A gear portion 27e that meshes with each other is formed, and cylindrical ribs 27f and 27f are formed on the upper and lower surfaces. The rotation center X of the rotation base 27 is provided in the vertical direction at the center of the insertion hole 27a. Moreover, the recessed part 27b which can arrange | position the nail | claw piece 25 is formed in the internal peripheral surface of the insertion hole 27a. As shown in FIG. 5, the one surface of the recess 27 b bites into the electrode chip 4 so that the protrusion 25 d and the side surface 25 e of the claw piece 25 are pressed when the rotating base 27 is rotated forward to bite the claw piece tip 25 b into the electrode chip 4. The biting pressing surface 27c for rotating the claw piece 25 is used up to the region. In addition, the recess27bThe other surface presses the convex portion 25f and the side surface 25g (see FIG. 9) of the claw piece 25 when the rotation base 27 is reversed, and the claw piece tip 25b rotates to a retreat area that does not interfere with the electrode chip 4. The pressing surface 27d is used.
[0027]
3-9, the nail | claw piece 25 is comprised including the substantially rectangular plate-shaped main body 25a and the column-shaped support shaft 25h formed in the upper and lower end surfaces. The tip 25b of the main body 25a has an acute angle, and a plurality of concave grooves 25c are formed around the tip 25b in order to increase the frictional resistance with the electrode tip 4. In the claw piece 25 of the first embodiment, the upper and lower support shafts 25h are arranged in the space 22i portion of the rib 22f described later of the holding member 20 on the tip 25b side, and the cross-sectional shape of the claw piece 25 is as follows. The rotating base 27 protrudes from the recess 27b to enter the insertion hole 27a and enters the space 22i of the rib 22f. The supporting shafts 25h and 25h parallel to the rotation center X are used as the rotation centers. At the time of rotation, the tip 25b is formed to have a dimension capable of projecting into the insertion hole 22j of the holding member 20. Further, the height dimension h1 (see FIG. 3) of the main body 25a is set slightly smaller than the thickness dimension t1 (see FIG. 4) of the rib 22f of the holding member 20 described later.
[0028]
The holding member 20 includes a rotation center X coinciding with the rotation base 27. In the case of the first embodiment, as shown in FIGS. 3 and 4, a disk-shaped flat plate portion 21 and a stepped plate portion 22 are provided. And is configured.
[0029]
The flat plate portion 21 has an insertion hole 21a having an inner diameter dimension slightly larger than the outer diameter of the electrode tip 4 as an outer diameter dimension capable of rotating on the inner peripheral side of the rib 27f on the upper surface side of the rotation base 27. ing. The thickness dimension of the flat plate portion 21 is larger than the height dimension of the rib 27f, and the outer peripheral surface protruding from the rib 27f is a braking surface 21g of a brake arm 32 described later. Further, a tapered surface 21b is formed on the periphery of the insertion hole 21a on the upper surface side of the flat plate portion 21 so that the electrode chip 4 can be easily inserted from above. Furthermore, around the insertion hole 21a, one support hole 21c and two attachment holes 21e are formed with the support hole 21c interposed therebetween. On the inner periphery of the mounting hole 21e, a stepped surface 21f is formed by reducing the inner diameter on the lower side.
[0030]
The stepped plate portion 22 includes a disc-shaped disc portion 22a and a rib 22f that protrudes upward from the upper surface of the disc portion 22a.
[0031]
The disc portion 22a has an insertion hole 22b in the center that is slightly larger than the outer diameter of the electrode chip 4 as an outer diameter dimension that can rotate on the inner peripheral side of the rib 27f on the lower surface side of the rotating base 27. . The thickness of the disc portion 22a is set to be equal to the height of the rib 27f, and a tapered surface 22c is formed on the periphery of the insertion hole 22b on the lower surface side so that the electrode chip 4 can be easily inserted from below. ing. A support hole 22d is formed around the insertion hole 22b of the disc portion 22a so as to correspond to the support hole 21c of the flat plate portion 21. The support shafts 25h on the upper and lower surfaces of the claw piece 25 are fitted into the support holes 21c and 22d, respectively. And in the case of 1st Embodiment, the surface of the clockwise direction centering on the rotation center X among the internal peripheral surfaces of each support hole 21c * 22d receives the rotational torque at the time of the normal rotation of the rotation base 27. It becomes rotation action surface 21d * 22e.
[0032]
As shown in FIGS. 3 to 5, the rib 22 f has a substantially cylindrical shape that protrudes upward from the peripheral edge of the insertion hole 22 b by providing a space 22 i on the support hole 22 d on the upper surface of the disk portion 22 a. The rib 22f has an outer diameter dimension that can be inserted into the insertion hole 27a of the rotating base 27, and an inner diameter dimension d1 of the insertion hole 22j on the inner peripheral side is made equal to the insertion hole 22b. A plurality of recesses 22k are formed in a portion facing the space 22i on the inner peripheral surface of the insertion hole 22j. Further, the thickness dimension (height dimension) t1 of the rib 22f is set to be slightly larger than the thickness dimension t0 on the inner peripheral side of the ribs 27f and 27f in the rotating base 27. Then, four screw holes 22g are formed in the upper end surface of the rib 22f corresponding to the mounting holes 21e of the flat plate portion 21. Further, as shown in FIGS. 5 to 8, a concave groove 22h is formed on one surface of the space 22i of the rib 22f so as not to interfere with the claw piece 25 until it is arranged in the biting area. .
[0033]
The inner diameter dimension d1 of the insertion hole 22j of the holding member 20 is such that when the claw piece 25 is disposed in the biting area, the portion facing the claw piece 25 on the inner peripheral surface of the insertion hole 22b (the recess 22k side portion) It is set as a dimension capable of being pressed against the outer peripheral surface of the electrode tip 4 pressed by the piece 25. Incidentally, in the case of the embodiment, the inner diameter d1 of the insertion hole 22j is 17φ, and the outer diameter of the electrode tip 4 is 16φ.
[0034]
The case 14 is composed of upper and lower cases 15 and 16, and these upper and lower cases 15 and 16 project the ridges 15 b and 16 b to the inner peripheral surface on the tip side as shown in FIGS. In addition, through holes 15a and 16a corresponding to the outer diameter of the gear portion 27e of the rotating base 27 are provided, and bolts (not shown) for attaching the presser ring 18 are screwed into the protrusions 15b and 16b, respectively. Six screw holes 15c and 16c are formed. Furthermore, six connecting holes 15d and 16d are formed in the upper and lower cases 15 and 16 at the edge on the main body 10 side to connect to each other using bolts. The connecting hole 15d is a simple through hole, and the connecting hole 16d is a screw hole. Furthermore, the upper and lower cases 15 and 16 are provided with mounting holes 15e and 16e for mounting support bolts 33 for rotatably supporting the intermediate gear 29 and a brake arm 32 to be described later of the brake device 31. ing. The attachment hole 15e is a simple through hole, and the attachment hole 16e is a screw hole. Further, on the opposing surfaces of the upper and lower cases 15 and 16, storage recesses 15f (see FIG. 3) and 16f for storing the intermediate gear 29, and storage recesses 15g (not shown) and 16g for storing the drive gear 12, respectively. (See FIG. 4). The storage recess 16g is configured as a through hole.
[0035]
The presser ring 18 is for accommodating the rotary base 27 in the upper and lower cases 15 and 16 in a state where the rotary base 27 is rotatable. As shown in FIGS. 3 and 4, the upper and lower cases 15 and 16 are used. A cylindrical tube portion 18a that can be inserted into the inner peripheral side of the protrusions 15b and 16b, and a flange portion 18d formed on the outer peripheral surface of the end portion side of the tube portion 18a. Attaching holes 18e corresponding to the screw holes 15c and 16c of the upper and lower cases 15 and 16 are formed in the flange portions 18d. These presser rings 18 respectively contact the flanges 18d with the protrusions 15b and 16b of the upper and lower cases 15 and 16 by bolts (not shown) that are screwed into the screw holes 15c and 16c through the mounting holes 18e. It is attached to upper and lower cases 15 and 16 so that end face 18c of cylinder part 18a separated from collar part 18d may be made to oppose. Each mounting hole 18e is provided with a stepped surface for receiving the bolt head on the inner peripheral surface so that the bolt does not protrude when attached to the upper and lower cases 15 and 16. In the state of being attached to the upper and lower cases 15 and 16, each presser ring 18 is a cylindrical shape of the rotating base 27 on the inner peripheral surface 18b of the cylindrical portion 18a in a state where the rotating base 27 is rotatable. The outer peripheral surface of the rib 27f is restricted, and the upper and lower surfaces of the gear portion 27e of the rotating base 27 are restricted between the end faces 18c and 18c.
[0036]
The brake device 32 includes a pair of brake arms 32 and a compression coil spring 34 as urging means. Each of the pair of brake arms 32 is provided with a half-disc-shaped pressing piece 32a on the distal end side so as to cover the braking surface 21g of the flat plate portion 21 of the holding member 20 in half, and the central portion is a support bolt 33. And a spring seat 32b for disposing a compression coil spring 34 between them.SetConfigured.
[0037]
For assembling the tip portion 13, first, with the rotation base 27 and the intermediate gear 29 disposed between the upper and lower cases 15, 16, a bolt (not shown) is attached to the upper and lower cases 15, 16. Further, the upper and lower cases 15 and 16 are connected to each other by inserting bolts into the connection holes 15d and 16d. Thereafter, the claw piece 25 is disposed in the recess 27 b of the rotating base 27, and the flat plate portion 21 and the stepped plate portion 22 are disposed from above and below the rotating base 27. More specifically, the rib 22f is inserted into the insertion hole 27a from below, the attachment holes 21e and the screw holes 22g are made to correspond to each other, and the support shafts 25h are inserted into the support holes 21c and 22d. Then, when the connecting bolts 23 are screwed into the screw holes 22g through the mounting holes 21e, the flat plate portion 21 and the stepped plate portion 22 are connected to assemble the holding member 20, and the rotation base 27. The holding member 20 is disposed in the rotation base 27 so as to be inserted therethrough. At this time, the height dimension t1 of the rib 22f of the holding member 20 is greater than the height dimension h1 of the main body 25a of the claw piece 25 and the thickness dimension t0 on the inner peripheral side of the ribs 27f and 27f in the rotating base 27. Since the dimensions are slightly larger, the claw piece 25 is held by the holding member 20 so as to be rotatable about the support shaft 25h, and the holding member is regulated by a rib 27f or the like, and is rotated with the rotation base 27. It is arranged in the case 14 so as to be able to rotate relative to the rotation base 27 with the movement center X being coincident.
[0038]
Thereafter, with the compression coil spring 34 disposed between the spring seats 32b and 32b, the pressing piece portions 32a and 32a are brought into contact with the braking surface 21g of the flat plate portion 21 of the holding member 20 and the support bolt 33 is used. The pair of brake arms 32 and 32 are connected to the case 14InIf it attaches, the front-end | tip part 13 can be assembled. Note that after assembling the distal end portion 13, the distal end portion 13 may be assembled to the main body portion 10 while the intermediate gear 29 and the drive gear 12 are engaged.
[0039]
In the extraction device M1 of the first embodiment, when extracting the electrode tip 4, first, the electrode tip 4 is inserted into the insertion holes 21a and 22b of the holding member 20 arranged concentrically with the insertion hole 27a of the rotating base 27. 5 to 7 by using the drive gear 12 and the intermediate gear 29 by driving the drive motor in the main body 10 and mounting the rotating base 27 on the electrode chip 4. As shown, the rotation base 27 is rotated forward clockwise with respect to the rotation center X.
[0040]
Then, as shown in FIGS. 5 to 7, the biting pressing surface 27 c of the rotating base 27 comes into contact with the convex portion 25 d and the side surface 25 e of the claw piece 25, and the claw piece 25 is turned around the support shaft 25 h as a rotation center. As shown in FIG. 8, the claw piece 25 is rotated to the biting area, so that the tip 25b of the claw piece 25 can hold the electrode chip 4 in the insertion hole 22j. I bite into the outer peripheral surface.
[0041]
At this time, in the case of the first embodiment, the electrode tip 4 is bitten into the tip 25b of the claw piece 25 and is slightly inclined, and is brought into pressure contact with the recess 22k side portion of the insertion hole 22j.
[0042]
In this state, if the rotation base 27 further rotates forward, the tip 25b of the claw piece 25 is directed to the center direction side of the electrode chip 4, and deeply bites into the electrode chip 4, and the claw piece 25 has a biting resistance. Will increase. Then, the claw piece 25 becomes difficult to rotate, and the rotational torque of the rotary base 27 acts on the rotation action surfaces 21d and 22e that are the support portions of the claw piece 25, and the holding member 20 rotates the brake arms 32 and 32. It will rotate forward together with the rotation base 27 against the braking force.
[0043]
At this time, since the holding member 20 rotates in a state where the claw pieces 25 are bitten into the electrode chip 4 and the electrode chip 4 is held in the insertion hole 22j, the electrode chip 4 is rotated in the forward direction of the rotation base 27. Rotate to. And if the electrode tip 4 rotates even a little, the fitting state of the electrode tip 4 with the taper shaft 3 of the shank 1 will be cancelled | released. Therefore, thereafter, the electrode tip 4 can be removed from the shank 1 by moving the tip portion 13 together with the main body portion 10 downward, which is the tip side of the shank 1.
[0044]
After that, after the tip end portion 13 is disposed above a collection box (not shown), the drive motor on the main body portion 10 side is reversely driven to reverse the rotation base 27 in the counterclockwise direction with respect to the rotation center X. Then, as shown in FIG. 9, the retraction pressing surface 27d of the rotation base 27 abuts on the convex portion 25f and the side surface 25g of the claw piece 25, and the claw piece 25 is rotated counterclockwise around the support shaft 25h. The tip 25b of the claw piece 25 is disposed in a retreat area where the holding of the electrode tip 4 in the insertion hole 22j is released.
[0045]
Then, the electrode tip 4 is released from the biting of the tip 25b of the claw piece, and the pressure contact force to the concave portion 22k side portion on the inner peripheral surface of the insertion hole 22j is eliminated, so that the insertion hole 22j and the rotation of the holding member 20 are rotated. It can fall from the insertion hole 27a of the base | substrate 27, and can be accommodated in a collection box.
[0046]
The reverse rotation of the rotation base 27 is rotation in a direction in which the biting resistance of the claw piece 25 is reduced, and the holding member 20 has a rotational braking force of the pressing piece portion 32a of the brake arms 32 and 32 on the braking surface 21g. Therefore, when the rotation base 27 is reversed, only the claw piece 25 is rotated to the retreat area.
[0047]
In addition, the electrode tip 4 of the lower shank 2 can also be configured such that after the front end portion 13 is sheathed and the rotation base 27 is rotated forward, the front end portion 13 is moved to a predetermined position, and the rotation base 27 is further reversed. In this case, like the electrode tip 4 of the upper shank 1, it can be easily accommodated in the collection box.
[0048]
Therefore, in the extraction device M1 of the first embodiment, the parts arranged in the vicinity of the electrode chip 4 are the rotation base 27, the holding member 20 holding the claw piece 25, the case 14 storing these, and the brake arm 32. -32 etc. Furthermore, since the rotation mechanism itself when removing the electrode tip 4 is also used as a mechanism for holding the extracted electrode tip 4, it can be made thin, and the narrow portion between the shanks 1 and 2 can be formed. Even the fitted electrode tip 4 can be easily removed. Further, at the time of the extraction operation, the tip 25b of the claw piece 25 is simply digged into the electrode chip 4, so that no impact sound is generated, and the generation of sound during the operation can be suppressed as much as possible.
[0049]
In the first embodiment, the holding member 20 is disposed so as to pass through the insertion hole 27 a of the rotating base 27, and the end 21 g of the flat plate portion 21 is protruded from the rotating base 27 to hold the holding member 20. The rotational braking force applied to the outer peripheral surface 21g is generated by the brake arms 32 and 32 that are pressed against the outer peripheral surface 21g by using the compression coil spring 34 so as to apply frictional resistance to the outer peripheral surface 21g. Therefore, it becomes possible to suppress the brake arms 32 and 32 within the height dimension of the outer peripheral surface 21g, and further, the part of the brake device 31 other than the brake arm 32 can be separated from the vicinity of the electrode chip 4, Even if the brake device 31 is provided, it is possible to reduce the thickness of the portion near the electrode tip 4 in the extraction device M1 without increasing the thickness, and the electrode fitted in the narrow portion between the shanks 1 and 2 is further reduced. The chip 4 can be easily extracted.
[0050]
Furthermore, in 1st Embodiment, the nail | claw piece 25 is made into one, and the internal-diameter dimension d1 of the penetration hole 22j of the holding member 20 is in the inner peripheral surface of the penetration hole 22j at the time of arrangement | positioning to the biting area | region. The size is set such that the outer peripheral surface of the electrode chip 4 pressed by the claw piece 25 can be pressed against the claw piece 25 side portion facing the claw piece 25. Therefore, the holding of the electrode tip 4 in the insertion hole 22j of the holding member 20 is the two points where the tip 25b of the claw piece 25 and the inner peripheral surface of the insertion hole 22j contacting the electrode tip 4 are opposed to the recess 22k side portion. In addition, the electrode tip 4 can be held stably because the one claw piece tip 25b is bitten into the electrode tip 4.
[0051]
Further, in the case of the first embodiment, a recess 22k is formed at a portion facing the claw piece 25 on the inner peripheral surface of the insertion hole 22j when the claw piece 25 is arranged in the biting area. At the time of holding, the protrusions 22l on the periphery of the recesses 22k as well as the claw piece tips 25b can be bitten into the electrode chip 4, so that the electrode chip 4 can be held more stably.
[0052]
In the first embodiment, the configuration in which the electrode tip 4 is held so as to be sandwiched between the tip end 25b of the claw piece and the inner peripheral surface of the insertion hole 22j of the holding member 20 has been described. You may comprise so that the electrode tip 4 may be hold | maintained by the one front-end | tip 25b and the internal peripheral surface of the insertion hole 27a of the rotation base 27. FIG.
[0053]
Moreover, you may comprise so that the electrode tip 4 may be hold | maintained only by the nail | claw piece 45 like the extraction apparatus M2 of 2nd Embodiment shown to FIGS.
[0054]
The extraction device M2 of the second embodiment includes claw pieces 45, a holding member 40 that holds the claw pieces 45, and a rotation base 47 that are different from those of the first embodiment and that include upper and lower cases 15 and 16. The case 14, the presser rings 18 and 18, the intermediate gear 29, the brake device 31, the drive gear 12, and the main body 10 are the same members as those in the first embodiment, and description of these same members is omitted.
[0055]
As shown in FIGS. 12 to 14, the rotation base 47 is formed in a substantially disc shape with an insertion hole 47 a having an inner diameter dimension slightly larger than the outer diameter dimension of the electrode tip 4 in the center. Through holes of upper and lower cases 15 and 16 meshing with intermediate gear 2915aA gear portion 47e is formed which is housed in 16a and is regulated in the vertical direction so as to be rotatable between the cylinder end faces 18c and 18c of the upper and lower presser rings 18. The rotation center X of the rotation base 47 is provided in the vertical direction at the center of the insertion hole 47a. In addition, cylindrical ribs 47f and 47f that are slidably regulated on the inner peripheral surface of the cylindrical portion 18a of the presser ring 18 are formed on the upper and lower surfaces of the rotation base 47. Furthermore, the recessed part 47b which can each arrange | position the three claw pieces 45 is radially formed in the inner peripheral surface of the penetration hole 47a at equal intervals. Each recess 47bThen, each of the nail pieces 45 reaches the biting region in which one surface presses the projection 45c or the side surface 45d of the nail piece 45 during the normal rotation of the rotation base 47 and causes the nail piece tip 45b to bite into the electrode chip 4. The biting pressure surface 47c for rotating the. Further, as shown in FIG. 17, the other surface of each recess 47 d presses the projection 45 e and the side surface 45 f of the claw piece 45 when the rotating base 47 is reversed, so that the tip 45 b of the claw piece 45 is moved to the electrode tip 4. The retraction pressing surface 47d is rotated to a retreat area that does not interfere with the retraction area.
[0056]
In addition, the rotation base 47 of the second embodiment has an arcuate guide hole 47g centered on the rotation center X of the rotation base 47 between the recesses 47b. These guide holes 47g are holding members for the rotation base 47.4This guides the relative rotation of zero.
[0057]
As shown in FIGS. 12 to 14, each claw piece 45 includes a substantially rectangular plate-shaped main body 45 a and columnar support shafts 45 g formed on upper and lower end surfaces thereof. The tip 45b of the main body 45a is formed in an acute angle shape. In addition, each nail | claw piece 45 of 2nd Embodiment arrange | positions the up-and-down support shaft 45g in the approximate center between the base part side (convex part 45c * 45e (refer FIG. 15, 17) side) and the front-end | tip 45b side. The tip 45b is protruded into the insertion hole 47a of the rotation base 47 during rotation about the support shafts 45g and 45g parallel to the rotation center X. The height h2 (see FIG. 12) of the main body 45a is set slightly smaller than the height h3 (see FIG. 13) of the spacer 43 of the holding member 40 described later.
[0058]
The holding member 40 has a rotation center X coinciding with the rotation base 47, and in the case of the second embodiment, as shown in FIGS. 12 and 13, two disk-shaped flat plate portions 41 and 42, Three spacers 43 are connected to each other by six connecting bolts 44.
[0059]
The flat plate portions 41 and 42 are slightly larger than the outer diameter size of the electrode chip 4 as outer diameter dimensions that can rotate on the inner peripheral side of the rib 47f on the upper and lower surfaces of the rotation base 47, respectively. The insertion holes 41a and 42a having the same inner diameter as the insertion hole 47a are disposed in the center. Tapered surfaces 41b and 42b are formed at the peripheral edges of the insertion holes 41a and 42a on the outer surface side of the flat plate portions 41 and 42 so that the electrode tips 4 can be easily inserted from above and below. Further, the flat plate portions 41 and 42 have three support holes 41c and 42c and mounting holes 41e and 42e, respectively, concentrically and radially so as to face each other around the insertion holes 41a and 42a. Is formed. The support holes 41c and 42c are portions where the upper and lower support shafts 45g of the claw pieces 45 are fitted and held so that the claw pieces 45 are rotatably supported, and a part of the inner peripheral surface thereof is normally rotated. The rotating action surfaces 41d and 42d receive the rotational torque when rotating together with the rotating base 47 at the time. Incidentally, in the case of the second embodiment, the receiving surfaces 41d and 42d are surfaces on the counterclockwise side when the rotation center X of the rotation base 47 on the inner peripheral surface of each support hole 41c and 42c is the center. Yes. Each of the mounting holes 41e and 42e has a stepped surface that contacts the head of the connecting bolt 44 by reducing the inner diameter of the inner side.
[0060]
And the thickness dimension t2 (refer FIG. 13) of the flat plate part 41 is made larger than the height dimension h4 (refer FIG. 12) of the rib 47f in the upper surface side of the rotation base 47, and the outer peripheral surface which protruded from the rib 47f is The braking surface 41f of the pressing piece 32a of the brake arms 32 and 32 is used. Further, the thickness dimension of the flat plate portion 42 is made equal to the height dimension of the rib 47 f on the lower surface side of the rotating base 47.
[0061]
Each spacer 43 has a cylindrical shape with an outer diameter dimension that can be inserted into each guide hole 47g of the rotation base 47, and a screw hole 43a corresponding to the connecting bolt 44 is formed on the inner peripheral side. As described above, the height dimension h3 (see FIG. 13) of each spacer 43 is slightly larger than the height dimension h2 of the main body 45a of each claw piece 45, and the ribs 47f and 47f of the rotation base 47 are further increased. The dimension is set slightly larger than the thickness dimension t3 on the inner peripheral side.
[0062]
The assembly of the tip portion 13 of the second embodiment will be described. First, the upper and lower cases 15 and 16 are mounted on the upper and lower cases 15 and 16 with the rotation base 47 and the intermediate gear 29 disposed between them. The presser ring 18 is attached with a bolt (not shown), and the upper and lower cases 15 and 16 are connected to each other by inserting the bolt into the connecting holes 15d and 16d. Thereafter, each claw piece 45 is disposed in each recess 47b of the rotating base 47, and each spacer 43 is disposed in each guide hole 47g of the rotating base 47 so that a flat plate is formed from above and below the rotating base 47. The parts 41 and 42 are arranged. Then, the mounting holes 41e and 42e correspond to the screw holes 43a of the spacers 43, and the support shafts 45g are inserted into the support holes 41c and 42c. After that, when the connecting bolts 44 are screwed into the screw holes 43a through the mounting holes 41e and 42e, the flat plate portions 41 and 42 and the three spacers 43 are connected to assemble the holding member 40, and The holding member 40 is disposed in the rotating base 47 so as to pass through the moving base 47.
[0063]
At this time, the height dimension h3 of each spacer 43 of the holding member 40 is equal to the height dimension h2 of the main body 45a of each claw piece 45 or the thickness dimension t3 on the inner peripheral side of the ribs 47f and 47f in the rotating base 47. Since the dimensions are slightly larger, each claw piece 45 is held by the holding member 40 so as to be rotatable about the support shaft 45g, and the holding member 40 is regulated by the rib 47f, the guide hole 47g, and the like. Thus, the rotation base 47 and the rotation center X are made to coincide with each other so that the rotation base 47 and the rotation base 47 can be rotated relative to each other.
[0064]
  Thereafter, with the compression coil spring 34 disposed between the spring seats 32b and 32b, the pressing piece portions 32a and 32a are brought into contact with the braking surface 41f of the flat plate portion 41 of the holding member 40, and the support bolt 33 is used. The pair of brake arms 32 and 32 are connected to the case 14InIf attached, the front-end | tip part 13 of 2nd Embodiment can be assembled.
[0065]
After assembling the distal end portion 13, the distal end portion 13 may be assembled to the main body portion 10 while engaging the intermediate gear 29 and the drive gear 12.
[0066]
In the extraction device M2 according to the second embodiment, when the electrode chip 4 is extracted, first, the electrode base 4 is externally attached to the electrode chip 4 so that the electrode chip 4 is inserted into the insertion hole 47a of the rotation base 47. Then, the drive motor in the main body 10 is driven and the drive gear 12 and the intermediate gear 29 are used to make the rotation base 47 the reference for the rotation center X as shown in FIGS. Then, rotate it counterclockwise.
[0067]
Then, as shown in FIGS. 14 and 15, each biting pressing surface 47c of the rotating base 47 comes into contact with the convex portion 45c and the side surface 45d of each claw piece 45, and each claw piece with the support shaft 45g as a rotation center. As shown in FIG. 16, each claw piece 45 is rotated to the biting area, so that the tip 45b of each claw piece 45 holds the electrode tip 4 in the insertion hole 47a. Possible to bite into the outer peripheral surface of the electrode tip 4.
[0068]
In this state, if the rotation base 47 further rotates in the forward direction, the tip 45b of each claw piece 45 is directed to the center direction side of the electrode tip 4, and deeply bites into the electrode tip 4, Biting resistance increases. Then, each claw piece 45 becomes difficult to rotate, and the rotational torque of the rotary base 47 acts on the rotation action surfaces 41d and 42d, which are the support portions of each claw piece 45, and the holding member 40 is connected to the brake arms 32 and 32. It will rotate forward together with the rotation base 47 against the rotational braking force.
[0069]
At this time, since the holding member 40 rotates in a state where each nail piece 45 is bitten into the electrode chip 4 and the electrode chip 4 is held in the insertion hole 47 a, the electrode chip 4 is rotated forwardly of the rotation base 47. Rotate counterclockwise. And if the electrode tip 4 rotates even a little, the fitting state of the electrode tip 4 with the taper shaft 3 of the shank 1 will be cancelled | released. Therefore, thereafter, the electrode tip 4 can be removed from the shank 1 by moving the tip portion 13 together with the main body portion 10 downward, which is the tip side of the shank 1.
[0070]
Thereafter, after the tip end portion 13 is disposed above a collection box (not shown), the drive motor on the main body portion 10 side is reversely driven to reverse the rotation base 47 in the clockwise direction with respect to the rotation center X. Then, as shown in FIG. 17, each retraction pressing surface 47d of the rotation base 47 abuts on the convex portion 45e and the side surface 45f of each claw piece 45, and each claw piece 45 is moved around the support shaft 45g. By rotating clockwise, the tip 45b of each claw piece 45 is arranged in a retreat area where the holding of the electrode tip 4 in the insertion hole 47a is released.
[0071]
Then, the biting of each claw piece tip 45b is eliminated, and the electrode tip 4 can be dropped from the insertion hole 47a of the rotating base 47 and accommodated in the collection box.
[0072]
The reverse rotation of the rotation base 47 is also a rotation in a direction in which the biting resistance of the claw piece 45 is reduced, and the holding member 40 has a rotational braking force of the pressing piece portions 32a of the brake arms 32 and 32 on the braking surface 41f. Therefore, when the rotation base 47 is reversed, only the claw piece 45 is rotated to the retreat area.
[0073]
Further, the electrode tip 4 of the lower shank 2 can also be configured such that after the outer end portion 13 is sheathed and the rotation base 47 is rotated forward, the front end portion 13 is moved to a predetermined position, and the rotation base 47 is further reversed. In this case, like the electrode tip 4 of the upper shank 1, it can be easily accommodated in the collection box.
[0074]
Therefore, also in the extraction device M2 of the second embodiment, the parts arranged in the vicinity of the electrode chip 4 are the rotation base 47, the holding member 40 holding the claw pieces 45, the case 14 storing these, and the brake arm 32. -32 etc. Furthermore, since the rotation mechanism itself when removing the electrode tip 4 is also used as a mechanism for holding the extracted electrode tip 4, it can be made thin, and it can be formed in a narrow part between the shanks 1 and 2. Even the fitted electrode tip 4 can be easily removed. Further, at the time of the extraction operation, the tip 45b of each claw piece 45 is simply digged into the electrode chip 4, so that no impact sound that collides is generated, and generation of sound during operation can be suppressed as much as possible. .
[0075]
Also in the second embodiment, the holding member 40 is disposed so as to pass through the rotation base 47, and the end portion 41 f of the flat plate portion 41 is protruded from the rotation base 47 and added to the holding member 40. The rotational braking force is generated by the brake arms 32 and 32 that are pressed against the outer peripheral surface 41f using the compression coil spring 34 so as to apply frictional resistance to the outer peripheral surface 41f. Therefore, it becomes possible to suppress the brake arms 32 and 32 within the height dimension of the outer peripheral surface 41f, and further, the part of the brake device 31 other than the brake arm 32 can be separated from the vicinity of the electrode chip 4, Even if the brake device 31 is provided, it is possible to reduce the thickness of the portion near the electrode tip 4 in the extraction device M2 without increasing the thickness, and the electrode fitted in the narrow portion between the shanks 1 and 2 is further reduced. The chip 4 can be easily extracted.
[0076]
Furthermore, in the second embodiment, each claw piece 45 is radially arranged at three locations on the inner peripheral surface of the insertion hole 47 a of the rotation base 47. Therefore, when the tip 45b of the claw piece 45 is bitten into the electrode tip 4, each claw piece tip 45b bites into the electrode tip 4 substantially evenly in the circumferential direction of the electrode tip 4, thereby suppressing the inclination of the electrode tip 4. Thus, the deformation of the taper shaft 3 in the shanks 1 and 2 can be suppressed as much as possible.
[0077]
In addition, in 2nd Embodiment, although the nail | claw piece 45 was shown to have arrange | positioned three places radially in the site | part of the internal peripheral surface of the insertion hole 47a of the rotation base 47, the inside of the insertion hole 47a was shown. Four or more radial positions may be provided on the peripheral surface.
[0078]
In addition, as a modification of the first embodiment, a single claw piece 45 having a tip 45b protruding slightly longer than that of the second embodiment is used as one, and the inside of the insertion hole 47 facing the claw piece 45 is as follows. The outer peripheral surface of the electrode tip 4 may be brought into pressure contact with the peripheral surface portion when the tip of the nail piece bites into the electrode tip.
[0079]
Furthermore, as a modification of the first embodiment, the two claw pieces 45 and 45 of the second embodiment are used, and the claw pieces 47 of the remaining claw pieces 45 are eliminated, and the crevices are filled without the crevice. The outer peripheral surface of the electrode tip 4 may be brought into pressure contact with such a portion when the tip of the nail piece bites into the electrode tip.
[0080]
Furthermore, with respect to the rotational braking force of the brake arms 32 and 32 with respect to the holding members 20 and 40 of the first and second embodiments, the tips 25b and 45b of the claw pieces 25 and 45 bite deeply into the electrode chip 4, and the claw pieces 25 and 45 The claw pieces 25 and 45 are difficult to rotate, and the rotational torque of the rotary bases 27 and 47 is applied to the rotation action surfaces 21d, 22e, 41d, and 42d that are the support portions of the claw pieces 25 and 45. It is necessary for the holding members 20 and 40 to rotate in the forward direction together with the rotary bases 27 and 47 against the rotational braking force of the brake arms 32 and 32. Therefore, before the tips 25b and 45b of the claw pieces 25 and 45 are completely oriented in the center direction of the electrode tip 4 (before the most bite into the electrode tip 4), the holding members 20 and 40 are turned to the rotation bases 27 and 47, respectively. At the same time, it is necessary to adjust the urging force of the spring 34 so that the rotational braking force of the brake arms 32 and 32 does not become too large in order to be able to rotate forward.
[Brief description of the drawings]
FIG. 1 is a plan view of a sampling device according to a first embodiment of the present invention.
FIG. 2 is a front view of the same embodiment.
FIG. 3 is an enlarged longitudinal sectional view taken along the line III-III in FIG.
FIG. 4 is a schematic exploded perspective view of the same embodiment.
FIG. 5 is a cross-sectional view of a main part showing a state immediately before the rotation of the rotating base during the extraction work of the embodiment.
FIG. 6 is a cross-sectional view of a main part showing a state immediately after the rotation of the rotating base during the extraction work of the embodiment.
7 is a cross-sectional view of the main part showing a state after FIG. 6 during the sampling operation of the same embodiment; FIG.
FIG. 8 is a cross-sectional view of the main part showing a state immediately before the holding member is rotated during the sampling operation of the same embodiment;
FIG. 9 is a cross-sectional view of the main part showing a state when the rotating base of the embodiment is reversed.
FIG. 10 is a plan view of a sampling device according to a second embodiment.
FIG. 11 is a front view of the same embodiment.
12 is an enlarged longitudinal sectional view of the XII-XII portion of FIG.
FIG. 13 is a schematic exploded perspective view of the same embodiment.
FIG. 14 is a cross-sectional view of the main part showing a state immediately before the rotation of the rotating base during the extraction work of the embodiment.
FIG. 15 is a cross-sectional view of the main part showing a state after the normal rotation of the rotating base during the extraction work of the same embodiment;
FIG. 16 is a cross-sectional view of the main part showing a state immediately before the holding member is rotated during the sampling operation of the same embodiment;
FIG. 17 is a cross-sectional view of a principal part showing a state when the rotating base of the embodiment is reversed.
[Explanation of symbols]
1.2 ... Shank,
3 ... Taper shaft,
4 ... Electrodes,
20.40 ... holding member,
21a, 22b, 22j, 41a, 42a ... insertion hole,
21c, 22d, 41c, 42c ... support holes,
21d, 22e, 41d, 42d ... Rotating surface,
21d · 41f ... braking surface,
22k ... recess,
25.45 ... nail pieces,
25b, 45b ... tip,
25h / 45g (rotating shaft) support shaft,
27.47 ... Rotating base,
27a, 47a ... insertion hole,
27c · 47c ... biting pressure surface,
27d / 47d: Retraction pressing surface,
31 ... Brake device,
32 ... Brake arm,
34 ... (Biasing means) Compression coil spring.

Claims (2)

抵抗溶接機のシャンクにおけるテーパ軸に嵌合された電極チップを回転させて抜き取る電極チップの抜き取り装置であって、
正転・逆転可能にケース内に収納保持されるとともに、回動中心に前記電極チップを挿入可能な挿通孔を備えた回動基盤と、
前記挿通孔の内周面に配置されて、前記挿通孔の軸方向と平行な回動軸を構成する支持軸を略長方形板状の本体の両端面から突出させるとともに、前記挿通孔内に挿入された電極チップ側の先端を鋭角状に形成させて、回動時、前記挿通孔内で前記電極チップを保持可能に、前記先端を、前記電極チップの中心方向側に回転させて、前記電極チップの外周面に食い込ませる領域と、前記挿通孔内での前記電極チップの保持を解除可能に、前記先端を、前記電極チップの外周面に食い込ませた方向と逆方向に回転させて、前記電極チップの外周面から離脱させる退避領域と、にそれぞれ配置可能に保持される爪片と、
前記回動基盤と一致する回動中心を備えて、前記回動基盤を挿通し、かつ、端部を前記回動基盤から突出させるように配設されるとともに、該回動中心に前記電極チップを挿入可能な挿通孔を備え、前記支持軸を嵌挿させて前記爪片を回動可能に保持するとともに、前記回動基盤と相対回転可能でかつ回転制動力を受けて回動可能に、前記ケース内に収納保持される保持部材と、
前記保持部材に回転制動力を付加するブレーキ装置と、
を備えて構成され、
前記回動基盤が、正転時、前記爪片を、前記支持軸を回転軸として、前記回動基盤の回転方向と同じ方向に回転させつつ、前記食い込み領域まで押圧して回転させる食い込み用押圧面と、逆転時、前記爪片を、前記支持軸を回転軸として、前記回動基盤の逆転方向と同じ方向に回転させつつ、前記退避領域まで押圧して回転させる退避用押圧面と、を備え、
前記ブレーキ装置が、前記保持部材における前記回動基盤から突出した外周面に摩擦抵抗を加えるように、付勢手段によって前記保持部材外周面に押圧可能として、前記ケースに支持されるブレーキアームを備え、
前記保持部材に付加される回転制動力が、前記ブレーキアームによりなされるとともに、前記爪片の前記食い込み領域への配置時における前記爪片の食い込み抵抗の増大時、前記爪片の前記先端が前記電極チップの中心方向に完全に向く前に、前記爪片の前記支持軸を嵌挿させている支持部位を回転作用面として、前記回動基盤の正転時の回転トルクを受け、前記回動基盤とともに前記保持部材を回転可能とする大きさ、として設定され、
前記保持部材若しくは前記回動基盤の挿通孔の内径寸法が、前記爪片の前記食い込み領域への配置時、前記爪片で押圧された前記電極チップの外周面を内周面に圧接可能な寸法、として設定され、
前記爪片の前記食い込み領域への配置時、前記爪片の先端と、前記電極チップを圧接された前記保持部材若しくは前記回動基盤の挿通孔の内周面と、により、前記電極チップを保持可能に、前記爪片が、一つ、若しくは、二つ、配設されていることを特徴とする電極チップの抜き取り装置。An electrode tip extraction device that rotates and extracts an electrode tip fitted to a taper shaft in a shank of a resistance welder,
A rotation base that is housed and held in a case so as to be able to rotate forward and reverse, and has an insertion hole into which the electrode tip can be inserted at the center of rotation,
Is disposed on the inner peripheral surface of the insertion hole, inserting the supporting shaft constituting the parallel rotation axis and the axial direction of the insertion hole are adapted to protrude from both end faces of the substantially rectangular plate-like body, into the insertion hole the tips of the electrodes tip side is formed at an acute angle shape, at the rotating time, to be able to hold the electrode tip in the insertion hole, the tip is rotated toward the center side of the electrode tip, the electrode a region to bite into the outer peripheral surface of the chip, releasably holding the electrode tip within the insertion hole, the tip is rotated in the direction opposite to the direction that has bite into the outer peripheral surface of the electrode tip, the A retraction area to be detached from the outer peripheral surface of the electrode tip, and a claw piece that is held so as to be respectively displaceable
A rotation center coinciding with the rotation base is provided, the rotation base is inserted, and an end is protruded from the rotation base, and the electrode tip is disposed at the rotation center. An insertion hole through which the support shaft is fitted and the claw piece is rotatably held, and is rotatable relative to the rotation base and can be rotated by receiving a rotational braking force. A holding member housed and held in the case;
A brake device for applying a rotational braking force to the holding member;
Configured with
A biting press for rotating the claw piece to the biting area while rotating the claw piece in the same direction as the rotation direction of the rotation base with the support shaft as a rotation axis at the time of normal rotation. A retraction pressing surface that rotates and rotates the claw piece to the retraction area while rotating the claw piece in the same direction as the reversal direction of the rotation base with the support shaft as a rotation axis. Prepared,
The brake device includes a brake arm supported by the case so that the holding member can be pressed against the outer peripheral surface of the holding member so as to apply a frictional resistance to the outer peripheral surface of the holding member protruding from the rotating base. ,
The rotational braking force applied to the holding member is made by the brake arm, and when the biting resistance of the claw piece is increased when the claw piece is arranged in the biting area, the tip of the claw piece is Before fully turning to the center direction of the electrode tip, the rotation part is subjected to rotational torque at the time of forward rotation, with the support part into which the support shaft of the claw piece is inserted being used as a rotation action surface, and the rotation Set as a size that allows the holding member to rotate together with the base ,
The inner diameter dimension of the holding member or the insertion hole of the rotating base is a dimension that allows the outer peripheral surface of the electrode chip pressed by the claw piece to be in pressure contact with the inner peripheral surface when the claw piece is disposed in the biting area. , Set as
When the claw piece is arranged in the biting area, the electrode tip is held by the tip of the claw piece and the inner peripheral surface of the holding member or the rotation hole of the rotation base pressed to the electrode tip. One or two of the claw pieces are arranged as possible. 抵抗溶接機のシャンクにおけるテーパ軸に嵌合された電極チップを回転させて抜き取る電極チップの抜き取り装置であって、
正転・逆転可能にケース内に収納保持されるとともに、回動中心に前記電極チップを挿入可能な挿通孔を備えた回動基盤と、
前記挿通孔の内周面に配置されて、前記挿通孔の軸方向と平行な回動軸を構成する支持軸を略長方形板状の本体の両端面から突出させるとともに、前記挿通孔内に挿入された電極チップ側の先端を鋭角状に形成させて、回動時、前記挿通孔内で前記電極チップを保持可能に、前記先端を、前記電極チップの中心方向側に回転させて、前記電極チップの外周面に食い込ませる領域と、前記挿通孔内での前記電極チップの保持を解除可能に、前記先端を、前記電極チップの外周面に食い込ませた方向と逆方向に回転させて、前記電極チップの外周面から離脱させる退避領域と、にそれぞれ配置可能に保持される爪片と、
前記回動基盤と一致する回動中心を備えて、前記回動基盤を挿通し、かつ、端部を前記回動基盤から突出させるように配設されるとともに、該回動中心に前記電極チップを挿入可能な挿通孔を備え、前記支持軸を嵌挿させて前記爪片を回動可能に保持するとともに、前記回動基盤と相対回転可能でかつ回転制動力を受けて回動可能に、前記ケース内に収納保持される保持部材と、
前記保持部材に回転制動力を付加するブレーキ装置と、
を備えて構成され、
前記回動基盤が、正転時、前記爪片を、前記支持軸を回転軸として、前記回動基盤の回転方向と同じ方向に回転させつつ、前記食い込み領域まで押圧して回転させる食い込み用押圧面と、逆転時、前記爪片を、前記支持軸を回転軸として、前記回動基盤の逆転方向と同じ方向に回転させつつ、前記退避領域まで押圧して回転させる退避用押圧面と、を備え、
前記ブレーキ装置が、前記保持部材における前記回動基盤から突出した外周面に摩擦抵抗を加えるように、付勢手段によって前記保持部材外周面に押圧可能として、前記ケースに支持されるブレーキアームを備え、
前記保持部材に付加される回転制動力が、前記ブレーキアームによりなされるとともに、前記爪片の前記食い込み領域への配置時における前記爪片の食い込み抵抗の増大時、前記爪片の前記先端が前記電極チップの中心方向に完全に向く前に、前記爪片の前記支持軸を嵌挿させている支持部位を回転作用面として、前記回動基盤の正転時の回転トルクを受け、前記回動基盤とともに前記保持部材を回転可能とする大きさ、として設定され、
前記爪片の前記食い込み領域への配置時、前記爪片の先端だけで前記電極チップを保持可能に、前記爪片が、前記挿通孔の内周面の部位に、３か所以上放射状に配設されていることを特徴とする電極チップの抜き取り装置。An electrode tip extraction device that rotates and extracts an electrode tip fitted to a taper shaft in a shank of a resistance welder,
A rotation base that is housed and held in a case so as to be able to rotate forward and reverse, and has an insertion hole into which the electrode tip can be inserted at the center of rotation,
Is disposed on the inner peripheral surface of the insertion hole, inserting the supporting shaft constituting the parallel rotation axis and the axial direction of the insertion hole are adapted to protrude from both end faces of the substantially rectangular plate-like body, into the insertion hole the tips of the electrodes tip side is formed at an acute angle shape, at the rotating time, to be able to hold the electrode tip in the insertion hole, the tip is rotated toward the center side of the electrode tip, the electrode a region to bite into the outer peripheral surface of the chip, releasably holding the electrode tip within the insertion hole, the tip is rotated in the direction opposite to the direction that has bite into the outer peripheral surface of the electrode tip, the A retraction area to be detached from the outer peripheral surface of the electrode tip, and a claw piece that is held so as to be respectively displaceable
A rotation center coinciding with the rotation base is provided, the rotation base is inserted, and an end is protruded from the rotation base, and the electrode tip is disposed at the rotation center. An insertion hole through which the support shaft is fitted and the claw piece is rotatably held, and is rotatable relative to the rotation base and can be rotated by receiving a rotational braking force. A holding member housed and held in the case;
A brake device for applying a rotational braking force to the holding member;
Configured with
A biting press for rotating the claw piece to the biting area while rotating the claw piece in the same direction as the rotation direction of the rotation base with the support shaft as a rotation axis at the time of normal rotation. A retraction pressing surface that rotates and rotates the claw piece to the retraction area while rotating the claw piece in the same direction as the reversal direction of the rotation base with the support shaft as a rotation axis. Prepared,
The brake device includes a brake arm supported by the case so that the holding member can be pressed against the outer peripheral surface of the holding member so as to apply a frictional resistance to the outer peripheral surface of the holding member protruding from the rotating base. ,
The rotational braking force applied to the holding member is made by the brake arm, and when the biting resistance of the claw piece is increased when the claw piece is arranged in the biting area, the tip of the claw piece is Before fully turning to the center direction of the electrode tip, the rotation part is subjected to rotational torque at the time of forward rotation, with the support part into which the support shaft of the claw piece is inserted being used as a rotation action surface, and the rotation Set as a size that allows the holding member to rotate together with the base ,
When the claw pieces are arranged in the biting area, the claw pieces are radially arranged at three or more locations on the inner peripheral surface of the insertion hole so that the electrode tips can be held only by the tips of the claw pieces. extractor electrode tip, characterized in that it is set.
JP18645198A 1998-07-01 1998-07-01 Electrode tip extraction device Expired - Fee Related JP3680154B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP18645198A JP3680154B2 (en) 1998-07-01 1998-07-01 Electrode tip extraction device
KR1019990019709A KR100318855B1 (en) 1998-07-01 1999-05-31 An electrode tip elimination device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP18645198A JP3680154B2 (en) 1998-07-01 1998-07-01 Electrode tip extraction device
US09/470,451 US6188038B1 (en) 1998-07-01 1999-12-22 Device for removing an electrode tip

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JP3680154B2 true JP3680154B2 (en) 2005-08-10

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2960003A1 (en) * 2012-03-15 2015-12-30 Peter Lutz Device for the removal of electrode caps on welding robots

Families Citing this family (4)

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Publication number Priority date Publication date Assignee Title
KR100472778B1 (en) * 2001-07-24 2005-03-07 주식회사 교쿠토 dresser
JP2010089115A (en) * 2008-10-07 2010-04-22 Kyokutoh Co Ltd Extraction device for electrode chip
EP2942145B1 (en) * 2013-03-26 2019-09-25 Kyokutoh Co., Ltd. Electrode removing device for spot welding
CN111151859B (en) * 2020-01-19 2023-12-29 广州市极动焊接机械有限公司 Electrode cap changing machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2960003A1 (en) * 2012-03-15 2015-12-30 Peter Lutz Device for the removal of electrode caps on welding robots

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