JP3509000B2 - Drive for welding gun - Google Patents
Drive for welding gunInfo
- Publication number
- JP3509000B2 JP3509000B2 JP30059099A JP30059099A JP3509000B2 JP 3509000 B2 JP3509000 B2 JP 3509000B2 JP 30059099 A JP30059099 A JP 30059099A JP 30059099 A JP30059099 A JP 30059099A JP 3509000 B2 JP3509000 B2 JP 3509000B2
- Authority
- JP
- Japan
- Prior art keywords
- ball
- screw shaft
- welding gun
- ball screw
- servomotor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Resistance Welding (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、サ―ボモ―タによ
って駆動されるボ―ルネジ軸を備えた溶接ガンの駆動装
置に関するものである。
【０００２】
【従来の技術】従来、サ―ボモ―タによって駆動される
ボ―ルネジ軸を備えた溶接ガンで、サ―ボモ―タから延
出された出力軸の先端部にボ―ルネジ軸を接続し、該ボ
―ルネジ軸のネジに噛み合うボ―ルナットを可動ア―ム
側に固定し、前記サ―ボモ―タの駆動によって可動ア―
ムを往復動させ、該可動ア―ムの往復動により電極に加
圧動作を付与するようにした溶接ガンの駆動装置は例え
ば実開平５ー１８７７４号公報に示すように公知であ
る。
【０００３】
【発明が解決しようとする課題】ところが、上記従来例
の溶接ガンの駆動装置の場合には、サ―ボモ―タの駆動
によって可動ア―ムを往復動させるためのサ―ボモ―タ
から延出された出力軸の先端部のボ―ルネジと該ボ―ル
ネジのネジに噛み合うボ―ルナットが、前記サ―ボモ―
タから離れた位置にあるため、該サ―ボモ―タと電極間
が長くなり、結局，溶接ガン全体が長くなり例えばロボ
ットによって該溶接ガンを操作する場合等に操作が不安
定になる虞がある。
【０００４】また、前記ボ―ルネジのネジと該ネジに噛
み合うボ―ルナットがサ―ボモ―タから露出しているた
め、溶接によって発生する溶接塵や周囲の塵が、ネジや
ボ―ルナットに侵入して、噛み合い部を清浄に維持でき
ずガンが正常に動作できない虞もある。
【０００５】本発明は、従来の技術の有するこのような
問題点に鑑みてなされたものであり、その目的とすると
ころは、サ―ボモ―タの回転力をボ―ルネジ軸の往復動
に変換するための機構を該サ―ボモ―タ内に設けること
によって、溶接ガン全体の長さが短縮され、且つ前記変
換機構が清浄に維持され得る操作が容易な安定した溶接
ガンの駆動装置を提供しようとするものである。
【０００６】
【課題を解決するための手段】上記目的を達成するため
に、本発明における溶接ガンの駆動装置は、サ―ボモ―
タによって駆動されるボ―ルネジ軸を備えた溶接ガンに
おいて、前記サ―ボモ―タの軸芯部に該サ―ボモ―タの
回転子に固定されたボ―ルナットを配置し、該ボ―ルナ
ットと噛み合うネジを備えたボ―ルネジ軸の先端をサ―
ボモ―タから延出させ、該ボ―ルネジ軸は回り止めによ
り回転不能となっていると共に、前記サ―ボモ―タ内に
おいても往復動するようになっており、このボ―ルネジ
軸の往復動により電極に加圧動作を付与するようにした
ことを特徴とするものである。
【０００７】
【発明の実施の形態】図１を参照してこの発明の実施例
について説明をする。図において、１はサ―ボモ―タで
あり、該サ―ボモ―タ１は、その外殻２に固定された固
定子巻線３とその内周に配置された回転子磁極４及び該
回転子磁極４が固定された回転子５とからなり、該回転
子５は軸受６，６によってサ―ボモ―タ１の前記外殻２
に軸支されている。また、回転子５にはサ―ボモ―タ１
の軸芯部に位置するボ―ルナット７が配置されている
【０００８】８はボ―ルネジ軸であり、該ボ―ルネジ軸
８の後端側には前記ボ―ルナット７と噛み合うネジ９が
形成され、ボ―ルネジ軸８の先端はサ―ボモ―タ１から
延出され、該ボ―ルネジ軸８の先端にはポイントホル
ダ，シャンク等を介して電極１０が取付けられている。
そして、該ボ―ルネジ軸８は回り止め１１によって回転
不能になっていると共に、前記サ―ボモ―タ１内におい
ても往復動するようになっている。
【０００９】また、前記サ―ボモ―タ１の外周には固定
ア―ム１２の一端が固定されており、該固定ア―ム１２
の他端部には前記ボ―ルネジ軸８側の電極１０と対向す
る位置に電極１３が取付けられている。なお、１４は前
記電極１０，１３に溶接用電流を供給するための給電部
である。
【００１０】上記のような溶接ガンにおいて、図示の状
態でサ―ボモ―タ１の固定子巻線３に例えば三相電流を
供給すると、回転子磁極４が励磁され回転子５が回転
し、該回転子５に固定されたボ―ルナット７が回転を行
う。該ボ―ルナット７の回転に伴って該ボ―ルナット７
と噛み合うネジ９は前進し、これによってボ―ルネジ軸
８側の電極１０は固定ア―ム１２側の電極１３に順次接
近し、両電極１０，１３間にワ―ク（図示せず）を挟持
した時点で給電部１４から両電極１０，１３に溶接用電
流を供給することによって溶接作業が行われる。
【００１１】このように、ボ―ルナット７とこれに噛み
合うボ―ルネジ軸８のネジ９をサ―ボモ―タ１内に位置
させたので、その分，従来の可動ア―ムに比してボ―ル
ネジ軸８のサ―ボモ―タ１から延出する長さは短縮さ
れ、結局，溶接ガン全体の長さが短縮されコンパクトに
なる。しかも溶接によって発生する溶接塵や周囲の塵
が、前記ネジ９やボ―ルナット７に侵入することができ
ないので回転運動を往復運動に変換する変換装置は常時
清浄に維持される。
【００１２】
【発明の効果】本発明においては、サ―ボモ―タの軸芯
部に該サ―ボモ―タの回転子に固定されたボ―ルナット
を配置し、該ボ―ルナットと噛み合うネジを備えたボ―
ルネジ軸の先端をサ―ボモ―タから延出させ、該ボ―ル
ネジ軸の往復動により電極に加圧動作を付与するように
したので、従来のサ―ボモ―タから延出された出力軸の
先端部にボ―ルネジ軸を接続し該ボ―ルネジ軸のネジに
噛み合うボ―ルナットを可動ア―ム側に固定したものに
比して、サ―ボモ―タから延出される駆動軸の長さは短
縮され、結局，溶接ガン全体の長さが短縮されコンパク
トになり、操作が容易な溶接ガンの駆動装置となる。
【００１３】しかも、溶接によって発生する溶接塵や周
囲の塵が、前記ボ―ルネジ軸のネジやボ―ルナットに侵
入することができないので、回転運動を往復運動に変換
する変換装置は常時清浄に維持されることから、故障の
少ない安定した溶接ガンの駆動装置となる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving apparatus for a welding gun having a ball screw shaft driven by a servomotor. 2. Description of the Related Art Conventionally, a welding gun having a ball screw shaft driven by a servomotor has a ball screw shaft attached to the tip of an output shaft extending from the servomotor. And a ball nut meshing with the screw of the ball screw shaft is fixed to the movable arm side, and the movable arm is driven by driving the servo motor.
A driving device for a welding gun which reciprocates an arm and applies a pressurizing operation to the electrode by reciprocating the movable arm is known as disclosed in, for example, Japanese Utility Model Laid-Open No. Hei 5-18774. [0003] However, in the case of the above-described conventional driving apparatus for a welding gun, a servo motor for reciprocating a movable arm by driving a servo motor is used. The ball screw at the tip of the output shaft extended from the motor and a ball nut meshing with the screw of the ball screw are provided as the servo motor.
The distance between the servo motor and the electrode is long because the distance is away from the welding gun, so that the welding gun as a whole becomes long, and the operation may become unstable when the welding gun is operated by a robot, for example. is there. [0004] Further, since the screw of the ball screw and the ball nut meshing with the screw are exposed from the servo motor, welding dust generated by welding and surrounding dust are generated on the screw and the ball nut. There is a possibility that the intrusion may not be maintained to keep the engagement portion clean and the gun may not operate normally. The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to apply the rotational force of a servo motor to the reciprocating motion of a ball screw shaft. By providing a mechanism for conversion in the servomotor, the entire length of the welding gun is shortened, and a stable welding gun driving device that is easy to operate so that the conversion mechanism can be kept clean. It is something to offer. [0006] In order to achieve the above object, a driving apparatus for a welding gun according to the present invention comprises a servomotor.
In a welding gun provided with a ball screw shaft driven by a motor, a ball nut fixed to a rotor of the servo motor is disposed at an axis of the servo motor, and The tip of the ball screw shaft with a screw that engages with the
Vomo - is extended from the other, the ball - ball screw shaft to the detent
Rotation is impossible and the servo motor
The ball screw shaft also reciprocates, and the reciprocating motion of the ball screw shaft applies a pressurizing operation to the electrode. An embodiment of the present invention will be described with reference to FIG. In the drawing, reference numeral 1 denotes a servomotor, which is composed of a stator winding 3 fixed to an outer shell 2, a rotor magnetic pole 4 arranged on the inner periphery thereof, and a rotating motor. And a rotor 5 having a fixed rotor magnetic pole 4. The rotor 5 is supported by bearings 6 and 6 for the outer shell 2 of the servomotor 1.
It is pivoted. The rotor 5 has a servo motor 1
Reference numeral 8 denotes a ball screw shaft, and a screw 9 that meshes with the ball nut 7 is provided on the rear end side of the ball screw shaft 8. The ball screw shaft 8 has a tip extending from the servo motor 1, and an electrode 10 is attached to the tip of the ball screw shaft 8 via a point holder, a shank, or the like.
The ball screw shaft 8 is made non-rotatable by a detent 11 and also reciprocates within the servomotor 1. One end of a fixed arm 12 is fixed to the outer periphery of the servomotor 1.
An electrode 13 is attached to the other end of the electrode 13 at a position facing the electrode 10 on the ball screw shaft 8 side. Reference numeral 14 denotes a power supply unit for supplying a welding current to the electrodes 10 and 13. In the welding gun as described above, when, for example, a three-phase current is supplied to the stator winding 3 of the servomotor 1 in the illustrated state, the rotor magnetic poles 4 are excited and the rotor 5 rotates. A ball nut 7 fixed to the rotor 5 rotates. The rotation of the ball nut 7 causes the ball nut 7 to rotate.
The screw 9 meshing with the electrode advances, whereby the electrode 10 on the ball screw shaft 8 sequentially approaches the electrode 13 on the fixed arm 12, and a work (not shown) is formed between the electrodes 10 and 13. The welding operation is performed by supplying a welding current from the power supply unit 14 to both the electrodes 10 and 13 at the time of being sandwiched. As described above, since the ball nut 7 and the screw 9 of the ball screw shaft 8 meshing with the ball nut 7 are located in the servo motor 1, the ball nut 7 is compared to the conventional movable arm. The length of the ball screw shaft 8 extending from the servo motor 1 is shortened, and as a result, the entire length of the welding gun is shortened and the size is reduced. In addition, since welding dust and surrounding dust generated by welding cannot enter the screw 9 and the ball nut 7, the converter for converting the rotary motion into the reciprocating motion is always kept clean. According to the present invention, a ball nut fixed to a rotor of a servo motor is arranged on a shaft core of the servo motor, and a screw engaged with the ball nut is provided. A boat with
The tip of the screw shaft is extended from the servo motor, and the reciprocating motion of the ball screw shaft applies a pressurizing operation to the electrode, so that the output extended from the conventional servo motor A drive shaft that extends from the servo motor as compared with a ball screw shaft connected to the tip of the shaft and a ball nut that engages with the screw of the ball screw shaft fixed to the movable arm side The overall length of the welding gun is shortened, and the overall length of the welding gun is reduced and the welding gun is easily operated. Moreover, since the welding dust and the surrounding dust generated by welding cannot enter the screw of the ball screw shaft or the ball nut, the converter for converting the rotary motion into the reciprocating motion is always clean. Because it is maintained, a stable welding gun drive with less failure is provided.
【図面の簡単な説明】
【図１】本発明に係る溶接ガンの一部断面側面図であ
る。
【符号の説明】
１ サ―ボモ―タ
５ 回転子
７ ボ―ルナット
８ ボ―ルネジ軸
９ ネジ
１０，１３ 電極
１２ 固定ア―ムBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial sectional side view of a welding gun according to the present invention. [Description of Signs] 1 Servo motor 5 Rotor 7 Ball nut 8 Ball screw shaft 9 Screw 10, 13 Electrode 12 Fixed arm
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平７−124752（ＪＰ，Ａ) 特開 平１−311844（ＪＰ，Ａ) 特開 平７−272331（ＪＰ，Ａ) 特開 昭60−9342（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B23K 11/11 550 B23K 11/11 520 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-124752 (JP, A) JP-A-1-3111844 (JP, A) JP-A-7-272331 (JP, A) JP-A-60-1985 9342 (JP, A) (58) Field surveyed (Int. Cl. 7 , DB name) B23K 11/11 550 B23K 11/11 520
Claims (1)
ネジ軸を備えた溶接ガンにおいて、前記サ―ボモ―タの
軸芯部に該サ―ボモ―タの回転子に固定されたボ―ルナ
ットを配置し、該ボ―ルナットと噛み合うネジを備えた
ボ―ルネジ軸の先端をサ―ボモ―タから延出させ、該ボ
―ルネジ軸は回り止めにより回転不能となっていると共
に、前記サ―ボモ―タ内においても往復動するようにな
っており、このボ―ルネジ軸の往復動により電極に加圧
動作を付与するようにしたことを特徴とする溶接ガンの
駆動装置。(57) [Claim 1] In a welding gun provided with a ball screw shaft driven by a servomotor, the servomotor is attached to the shaft core of the servomotor. ball secured to motor rotor - ball nut arranged,該Bo - ball with a screw that meshes with the ball nut - support the tip of the ball screw shaft - Vomo - is extended from the motor, the ball
-When the screw shaft is unable to rotate due to rotation
In addition, reciprocating motion also occurs in the servomotor.
And a pressurizing operation is applied to the electrode by the reciprocating motion of the ball screw shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30059099A JP3509000B2 (en) | 1999-10-22 | 1999-10-22 | Drive for welding gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30059099A JP3509000B2 (en) | 1999-10-22 | 1999-10-22 | Drive for welding gun |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10504994A Division JP3489747B2 (en) | 1994-04-21 | 1994-04-21 | C type welding gun |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000094143A JP2000094143A (en) | 2000-04-04 |
| JP3509000B2 true JP3509000B2 (en) | 2004-03-22 |
Family
ID=17886683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30059099A Expired - Lifetime JP3509000B2 (en) | 1999-10-22 | 1999-10-22 | Drive for welding gun |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3509000B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001314972A (en) * | 2000-05-08 | 2001-11-13 | Obara Corp | Electrical driving unit for welding apparatus |
| JP2001321955A (en) * | 2000-05-10 | 2001-11-20 | Obara Corp | Motor driven x-type gun |
| JP2001347378A (en) * | 2000-06-05 | 2001-12-18 | Obara Corp | C-c type motor-driven welding gun |
| GB2407527B8 (en) * | 2001-05-18 | 2005-09-02 | Honda Motor Co Ltd | Motor driven resistance spot welding gun |
| GB2391505B (en) * | 2001-05-18 | 2005-11-09 | Honda Motor Co Ltd | Motor driven resistance spot welding gun |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS609342A (en) * | 1983-06-29 | 1985-01-18 | Shinichi Watanabe | Motor with rectilinear motion shaft |
| JP2659998B2 (en) * | 1988-06-08 | 1997-09-30 | 工業技術院長 | Linear actuator |
| JP3085058B2 (en) * | 1993-10-29 | 2000-09-04 | 日産自動車株式会社 | Spot welding gun |
| JP3151104B2 (en) * | 1994-04-04 | 2001-04-03 | キヤノン株式会社 | Recording and playback device |
-
1999
- 1999-10-22 JP JP30059099A patent/JP3509000B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000094143A (en) | 2000-04-04 |
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