JP2019118918A - Switch mechanism - Google Patents
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本発明は、抵抗溶接機に適用可能なスイッチ機構に関する。 The present invention relates to a switch mechanism applicable to a resistance welder.
抵抗溶接は、溶接対象（ワーク）の溶接しようとする部分に電流を流し、ジュール熱及び加圧力によりワークを融合させて溶融金属を作ってこれを凝固させ接合する方法である。代表的な例であるスポット溶接は、溶接対象であるワークを電極で挟み、加圧しながら数千アンペアから数万アンペアの大電流を流し、ナゲットをつくり溶融して接合するものである。 Resistance welding is a method in which an electric current is supplied to a portion to be welded of a workpiece (work), and the work is fused by Joule heat and pressure to make a molten metal, which is solidified and joined. Spot welding, which is a typical example, is to sandwich a workpiece to be welded between electrodes, apply a large current of several thousands to several tens of thousands of amperes while pressing, create a nugget, melt and join them.
近年はスポット溶接機の構成例として、インバータ直流式の採用が増えてきている。インバータ直流式のスポット溶接機は、二次側アームを長くとることが可能であり、インバータを備えた電源装置、トランス、一対の電極、加圧機構であるサーボモータ等を備える。電圧センサーなど各種センサーが、電極間電圧とトランス２次側からの電流値を検知すべく必要に応じて設けられる。 In recent years, the adoption of an inverter direct current type has been increasing as a configuration example of a spot welder. The inverter direct current type spot welding machine can take a long secondary side arm, and includes a power supply device including an inverter, a transformer, a pair of electrodes, a servomotor as a pressing mechanism, and the like. Various sensors such as voltage sensors are provided as needed to detect the inter-electrode voltage and the current value from the secondary side of the transformer.
インバータ直流式の電源装置は、インバータ回路及び整流回路を含んでおり交流を整流して直流に変換し、IGBTにより周波数を変えた交流を作り、トランスの１次側へ供給する。変圧されてトランスの２次側から導出された電流がダイオードで直流化され、一対の電極へ供給され溶接電流を通電させることが可能である。 The inverter DC type power supply device includes an inverter circuit and a rectifier circuit, rectifies alternating current to convert it into direct current, generates alternating current whose frequency is changed by the IGBT, and supplies it to the primary side of the transformer. It is possible to convert the current drawn from the secondary side of the transformer into a direct current by a diode and supply it to a pair of electrodes to conduct a welding current.
これらスポット溶接などの抵抗溶接において、電極寿命は重要な要素となる。電極の消耗が早く寿命が短くなれば、ドレッシング頻度及び交換頻度が増加することにより、時間的にも費用的にも品質的にも影響を及ぼし、生産性が低下するからである。そして、抵抗溶接に直流を適用した場合は，極性効果、電極と溶接対象のめっき金属との溶着，合金化、ペルチェ効果等により、一方の電極の消耗が顕著となることが知られている。同様の課題は、必ずしも抵抗溶接に限らず生じ得る。 Electrode resistance is an important factor in resistance welding such as spot welding. If the consumption of the electrode is fast and the life is short, the dressing frequency and the replacement frequency increase, which affects the time, the cost and the quality, and the productivity decreases. And when direct current is applied to resistance welding, it is known that the consumption of one of the electrodes becomes remarkable due to the polarity effect, welding between the electrodes and the plated metal to be welded, alloying, Peltier effect, etc. The same problem may occur not necessarily in resistance welding.
上記課題に対し、例えば特許文献１のように、電極素材を改良するなどの解決手段が知られている。しかしながら、従来の技術では、一方の電極の消耗が早くなるという問題点に対応することができない。さらに、両電極の消耗度が異なると、溶接効率も品質も低下する。 With respect to the above problems, for example, as in Patent Document 1, a solution means is known such as improving the electrode material. However, the prior art can not cope with the problem that the consumption of one of the electrodes becomes fast. Furthermore, if the degree of wear of the two electrodes is different, the welding efficiency and the quality will be reduced.
そこで、本願発明は、偏ることなく電極寿命を延長し、溶接品質を向上することが可能な機構を提供すること、さらには他の装置に適用できる汎用性の高い機構を提供することを目的とする。 Therefore, the present invention aims to provide a mechanism capable of extending electrode life without deviation and improving welding quality, and further providing a versatile mechanism applicable to other devices. Do.
上記課題を解決するため、本発明のスイッチ機構は、
電源から導出される第１の導電部材及び第２の導電部材と、
対象物へ電流を流すための一対の電極と接続された第３及び第４の導電部材とを接続するスイッチ機構であり、
第３及び第４の導電部材が、第１の導電部材及び第２の導電部材のいずれにも接続可能であって、
第３の導電部材が第１の導電部材に接続している場合は第２の導電部材には接続せず、かつ第４の導電部材が第２の導電部材に接続し、
第３の導電部材が第２の導電部材に接続している場合は第１の導電部材には接続せず、かつ第４の導電部材が第１の導電部材に接続し、
第３の導電部材が接続する部材を、第１の導電部材及び第２の導電部材のいずれかにおいて選択的に切り替える機構を備えることからなる。
In order to solve the above problems, the switch mechanism of the present invention is
A first conductive member and a second conductive member derived from a power source;
A switch mechanism for connecting a third and a fourth conductive member connected to a pair of electrodes for flowing current to an object,
The third and fourth conductive members are connectable to any of the first conductive member and the second conductive member,
When the third conductive member is connected to the first conductive member, it is not connected to the second conductive member, and the fourth conductive member is connected to the second conductive member,
When the third conductive member is connected to the second conductive member, it is not connected to the first conductive member, and the fourth conductive member is connected to the first conductive member,
It comprises providing the mechanism which selectively switches the member which a 3rd electroconductive member connects in either a 1st electroconductive member and a 2nd electroconductive member.
また、切り替え機構が、移動機構を備え、当該移動機構の作動により、導電部材が接続する対象が切り替えられるものであることが好適である。
また、移動機構が昇降機構、回転機構又はスライド機構であることが好適である。
Further, it is preferable that the switching mechanism includes a moving mechanism, and the operation of the moving mechanism switches the target to which the conductive member is connected.
Further, it is preferable that the moving mechanism is a lifting mechanism, a rotating mechanism or a sliding mechanism.
また、移動機構が昇降機構であり、
切り替え機構が昇降機構と接続された絶縁性の基体を含み、
当該基体は、第１及び第２の導電部材、または第３及び第４の導電部材と接続され、昇降運動による基体の移動により接続する対象が切り替えられるものであることが好適である。
また、基体が回転軸を有し回動するものであることが好適である。
Also, the moving mechanism is a lifting mechanism,
The switching mechanism includes an insulating substrate connected to the lifting mechanism;
It is preferable that the substrate is connected to the first and second conductive members or the third and fourth conductive members, and the object to be connected is switched by the movement of the substrate by the elevating motion.
In addition, it is preferable that the base has a rotation axis and is rotatable.
さらに、本発明のスイッチ機構は、
電源から導出される第１の導電部材及び第２の導電部材と、
対象物へ電流を流すための一対の電極と接続された第３及び第４の導電部材とを接続するスイッチ機構であり、
第３及び第４の導電部材が、第１の導電部材及び第２の導電部材のいずれにも接続可能であって、
第３の導電部材が第１の導電部材に接続している第１の位置において第２の導電部材には接続せず、かつ第４の導電部材が第２の導電部材に接続し、
第３の導電部材が第２の導電部材に接続している第２の位置において第１の導電部材には接続せず、かつ第４の導電部材が第１の導電部材に接続し、
第３の導電部材が接続する部材を、第１の導電部材及び第２の導電部材のいずれかにおいて選択的に切り替える機構を備えることからなる。
Furthermore, the switch mechanism of the present invention
A first conductive member and a second conductive member derived from a power source;
A switch mechanism for connecting a third and a fourth conductive member connected to a pair of electrodes for flowing current to an object,
The third and fourth conductive members are connectable to any of the first conductive member and the second conductive member,
Not connected to the second conductive member at a first position where the third conductive member is connected to the first conductive member, and the fourth conductive member is connected to the second conductive member,
Not connected to the first conductive member at the second position where the third conductive member is connected to the second conductive member, and the fourth conductive member is connected to the first conductive member,
It comprises providing the mechanism which selectively switches the member which a 3rd electroconductive member connects in either a 1st electroconductive member and a 2nd electroconductive member.
また、切り替え機構が、移動機構を備えることが好適である。また、移動機構が回転機構からなり、当該回転機構の回転運動により第３又は第４の導電部材が接続する対象が切り替えられるものであることが好適である。 Preferably, the switching mechanism comprises a moving mechanism. In addition, it is preferable that the moving mechanism is a rotating mechanism, and the target connected to the third or fourth conductive member is switched by the rotational movement of the rotating mechanism.
また、回転機構により、第１及び第２の導電部材、あるいは第３及び第４の導電部材が回転するものであることが好適である。
また、第１及び第２の導電部材が、あるいは第３及び第４の導電部材が、互いに絶縁された円筒形の導電部材として構成されていることが好適である。
Preferably, the first and second conductive members or the third and fourth conductive members are rotated by the rotation mechanism.
Further, it is preferable that the first and second conductive members or the third and fourth conductive members are configured as cylindrical conductive members insulated from each other.
本発明者は、上記課題を解決するにあたり、電極の極性が原因で一方の消耗が早くなることに着目し、正極・負極を入れ替えるスイッチ機構を導入することで、電極素材や構成とは無関係にメッキと還元が繰り返され、電極寿命を延長することに到達したものである。本発明によれば、確実かつ安全な手段で、一方の電極の消耗が激しくなることを防ぐことにより、電極の寿命を延長させるだけではなく、一対の電極消耗を平滑化して溶接品質を向上させる。かつ、電極の極性の変換により還元側も変換されるため、電極とめっき金属との溶着，合金化を防ぐことになり、電極自体の寿命も延長し電極品質を維持することが可能になる。 In order to solve the above-mentioned problems, the inventor of the present invention pays attention to the fact that the consumption of one of the electrodes is accelerated due to the polarity of the electrode, and by introducing a switch mechanism for replacing the positive electrode and the negative electrode Plating and reduction were repeated, and it was reached to extend the electrode life. According to the present invention, it is possible to not only extend the life of the electrodes but also smooth the pair of electrode wear and improve the welding quality by preventing the exhaustion of one of the electrodes from becoming severe by a reliable and safe means. . In addition, since the reduction side is also converted due to the change in polarity of the electrode, welding and alloying between the electrode and the plated metal are prevented, and the life of the electrode itself can be extended and the quality of the electrode can be maintained.
本発明においては、電源から導出される一方の導電部材を第１の導電部材として、他方を第２の導電部材とする。通電時、極性はそれぞれ固定されている。一方、一対の電極からの導電部材を、各々第３及び第４の導電部材とする。従来は、上述通り、電源からトランス及びダイオード等を介して電極への導電部材はそのまま固定的に接続され、電極の極性も実質的に固定されていたところ、本発明では第３及び第４の導電部材においてこのような構成を廃しているものである。したがって、「電源から導出」されるとあるのは、トランスやインバータなど、必要な各種機器を介して導出されることを含む概念である。また、本発明において「導電部材」とあるのは、銅アームのような導電部材のほか、導線を絶縁被覆したケーブルなど、公知の導電部材を広く含み、また複数の部材が連結されている場合も含む趣旨である。 In the present invention, one of the conductive members derived from the power source is a first conductive member, and the other is a second conductive member. During energization, the polarities are fixed. On the other hand, the conductive members from the pair of electrodes are respectively referred to as third and fourth conductive members. Conventionally, as described above, the conductive member from the power source to the electrode is fixedly connected as it is via the transformer and the diode, and the polarity of the electrode is also substantially fixed. In the conductive member, such a configuration is eliminated. Therefore, “derived from the power supply” is a concept that includes being derived through various necessary devices such as a transformer and an inverter. In the present invention, the term "conductive member" refers to a conductive member such as a copper arm, a widely known conductive member such as a cable coated with a conductive wire, and a plurality of members are connected. Is also included.
本発明では、第１及び第２と、第３及び第４の導電部材はそれぞれ独立しており、それらが接続されることで通電される構成を有している。そして、第３及び第４の導電部材が、第１の導電部材及び負極性の第２の導電部材のいずれにも接続可能である。すなわち、電極側の第３の導電部材は、正極性（又は負極性）である第１の導電部材、及び負極性（又は正極性）の第２の導電部材のいずれにも接続が可能な構成を備えている。 In the present invention, the first and second conductive members and the third and fourth conductive members are independent of each other, and are electrically connected by being connected to each other. Then, the third and fourth conductive members can be connected to any of the first conductive member and the second conductive member of negative polarity. That is, the third conductive member on the electrode side can be connected to either the first conductive member of positive polarity (or negative polarity) or the second conductive member of negative polarity (or positive polarity). Is equipped.
そして、第３の導電部材が第１の導電部材に接続している場合（又は第１の位置にある場合）では、第２の導電部材には接続せず、かつ第４の導電部材が第２の導電部材に接続し、第３の導電部材が第２の導電部材に接続している場合（又は第２の位置にある場合）では第１の導電部材には接続せず、かつ第４の導電部材が第１の導電部材に接続する。すなわち、第３の導電部材が第１の導電部材に接しているときは、第４は導電部材が第２の導電部材と接続される。 And, when the third conductive member is connected to the first conductive member (or in the first position), it is not connected to the second conductive member, and the fourth conductive member is the fourth conductive member. Connected to the second conductive member, and when the third conductive member is connected to the second conductive member (or in the second position), it is not connected to the first conductive member, and the fourth The conductive member is connected to the first conductive member. That is, when the third conductive member is in contact with the first conductive member, the fourth conductive member is connected to the second conductive member.
そして、第３の導電部材が接続する部材を、第１の導電部材及び第２の導電部材のいずれかにおいて選択的に切り替える構成を備える。この構成により、電極の極性を正極・負極で切り替えることが可能になる。この切り替え機構としては、具体的には下記の移動機構が有利かつ好適であるが、それらに限定されず、本発明の効果を奏する限り、他の構成を採用することが可能である。 And the structure which selectively switches the member which a 3rd electrically-conductive member connects in either a 1st electrically-conductive member and a 2nd electrically-conductive member is provided. This configuration makes it possible to switch the polarity of the electrode between the positive electrode and the negative electrode. As the switching mechanism, specifically, the following moving mechanisms are advantageous and preferable, but are not limited thereto, and other configurations can be adopted as long as the effects of the present invention are exhibited.
移動機構の１例としては、たとえば昇降機構を備える場合がある。昇降機構が昇降することで、第３及び第４の導電部材（又は第１及び第２の導電部材）が移動し、その結果接続する対象が切り替わる機構である。好ましくは、切り替え機構は、昇降機構と接続された絶縁性の基体を含む。そして、当該基体には、第１及び第２の導電部材、または第３及び第４の導電部材が配置され、昇降運動による基体の移動により接続する対象が切り替えられる。すなわち、基体は導電部材が移動するための台座の役割とともに、導電部材が適切に選択的に他の１つの導電部材と接触できるための絶縁物としての役割を果たす。 As one example of the moving mechanism, for example, an elevating mechanism may be provided. As the elevating mechanism moves up and down, the third and fourth conductive members (or the first and second conductive members) move, and as a result, the objects to be connected are switched. Preferably, the switching mechanism includes an insulating substrate connected with the elevating mechanism. Then, the first and second conductive members or the third and fourth conductive members are disposed on the substrate, and the object to be connected is switched by the movement of the substrate by the vertical movement. That is, the base serves not only as a pedestal for moving the conductive member, but also as an insulator for enabling the conductive member to properly and selectively contact one other conductive member.
より具体的な例として、基体が回転軸を有し、回動するものとすることができる。この場合、当該回転軸を挟んだ両側に第３及び第４の導電部材（又は第１及び第２の導電部材）が配置されることが好適である。基体が回動すると、シーソーのように両側に配置した導電部材が相反した方向へ移動するため、この移動を利用して接触対象が切り替わるものである。この形態において、基体は略板状であり、基体の上下に二股に分かれた導電部材が配置されていることが好ましい。 As a more specific example, the base may have a rotating shaft and may rotate. In this case, it is preferable that the third and fourth conductive members (or the first and second conductive members) be disposed on both sides of the rotating shaft. When the base rotates, the conductive members disposed on both sides, such as a seesaw, move in opposite directions, so that the contact object is switched using this movement. In this embodiment, it is preferable that the base is substantially plate-like, and bifurcated conductive members are disposed above and below the base.
基体の作動のために、昇降機構は基体に対して少なくとも１つ設置される。また、昇降機構としては、基体を任意のタイミングで動作及び制御可能であれば良く、具体的な一例としては、シリンダによるものが挙げられる。さらに、より接触の正確性を高めるために、同一の回転軸を有し互いに相対する方向へ延長する２つの基体とし、それぞれが導電部材を、例えば上下に担う構成を採用できる。この時、昇降機構が基体に対して左右一対で設けられ、一方の昇降機構が上昇（下降）移動するときに、他方の昇降機構が下降（上昇）移動する構成を備えるものである実施態様を採用可能である。 For operation of the substrate, at least one lifting mechanism is provided relative to the substrate. In addition, as the elevating mechanism, it is sufficient if the base can be operated and controlled at an arbitrary timing, and a specific example is a cylinder. Furthermore, in order to further improve the accuracy of contact, it is possible to employ two substrates which have the same rotation axis and extend in the direction opposite to each other, and each of which carries the conductive member, for example, up and down. At this time, an elevating mechanism is provided in a pair on the left and right with respect to the base body, and when one elevating mechanism moves up (down), the other elevating mechanism moves down (up). It is possible to adopt.
また、昇降機構に換えて、回転軸に回転機構を接続し、その回転運動により第３及び第４の導電部材（又は第１及び第２の導電部材）が接続する対象が切り替えられる構成を採用することができる。この構成では、上述の昇降機構ではなく、回転機構により基体を介して第３及び第４の導電部材（又は第１及び第２の導電部材）が移動し、相互の接続対象が切り替えられる。具体的には、基体の回転軸にモータを接続して回動させることで、基体をシーソーのように移動させる態様とすることができる。 In addition, instead of the elevating mechanism, a rotating mechanism is connected to the rotating shaft, and the rotating movement switches the target to which the third and fourth conductive members (or the first and second conductive members) are connected. can do. In this configuration, the third and fourth conductive members (or the first and second conductive members) are moved via the base by the rotation mechanism, not the above-described elevating mechanism, and the mutual connection targets are switched. Specifically, by connecting a motor to the rotation shaft of the base and rotating it, the base can be moved like a seesaw.
また、移動機構の他の構成例として、例えば第１及び第２の導電部材がその電極側端部において各々２つに分岐して、第１の導電部材の第１の端部、第２の導電部材の第１の端部、第１の導電部材の第２の端部、第２の導電部材の第２の端部の順に基体状に略平面状に並び、第３及び第４の導電部材がスライド機構等により平面移動することによって接続対象が切り替わる構成を採用することも可能である。 In addition, as another configuration example of the moving mechanism, for example, the first and second conductive members are branched into two at their electrode side end portions, and the first end portion of the first conductive member, the second The third and fourth conductive members are arranged in a substantially planar shape in a base shape in the order of the first end of the conductive member, the second end of the first conductive member, and the second end of the second conductive member. It is also possible to adopt a configuration in which the connection target is switched by planar movement of the member by a slide mechanism or the like.
さらに、切り替え機構の他の実施形態として、第１及び第２の導電部材（又は第３及び第４の導電部材）を、互いに絶縁された円筒形の導電部材として構成する形態を挙げることができる。このとき、円筒形の導電部材にモータが接続され、モータの回転により円筒形の導電部材が回転することにより、相互の接続対象が切り替えられる構成である。この時、第１の導電部材に第３の導電部材及び第４の導電部材の両方が接触する瞬間がない方が好ましいことから、円筒形の導電部材表面に適宜絶縁部を設けることも可能である。 Furthermore, as another embodiment of the switching mechanism, the first and second conductive members (or the third and fourth conductive members) may be configured as cylindrical conductive members insulated from each other. . At this time, the motor is connected to the cylindrical conductive member, and when the cylindrical conductive member is rotated by the rotation of the motor, the mutual connection targets are switched. At this time, it is preferable that there is no moment when both the third conductive member and the fourth conductive member come into contact with the first conductive member, so it is possible to appropriately provide an insulating portion on the surface of the cylindrical conductive member. is there.
これら実施態様において、昇降運動装置及び回転装置等は、制御装置と接続され、任意のタイミングで切り替え可能であることが望ましい。この構成は、例えばスポット溶接機であれば、打点毎に、または一定の打点毎に切り替えを可能にする。また、本発明は、直流式、特にインバータ直流式の抵抗溶接装置に好適であり、３次元上の多点溶接を行うことが可能なスポット溶接機において高い効果を発揮するが、その他のスポット溶接機や、シーム溶接機など他の抵抗溶接機にも適用可能である。また、複雑な回路構成は不要であり、電源の内部構成を変更することなく、確実な切り替えを行うことができる一方で、軽量かつ小型な構成を採用できるため、メンテナンスも産業用ロボットへの搭載も容易である。さらには抵抗溶接機・スポット溶接機に止まらず、同様の課題及び利点を有する他の装置にも適用が可能である。 In these embodiments, it is desirable that the lifting and lowering motion device, the rotation device, and the like be connected to the control device and be switchable at any timing. This configuration makes it possible, for example, in the case of a spot welder, to switch from point to point, or from point to point. Further, the present invention is suitable for a direct current type, particularly an inverter direct current type resistance welding device, and exhibits high effects in a spot welding machine capable of performing multi-point welding in three dimensions, but other spot weldings It is applicable also to other resistance welding machines, such as a machine and a seam welding machine. In addition, since a complicated circuit configuration is not necessary and a reliable switching can be performed without changing the internal configuration of the power supply, a lightweight and compact configuration can be adopted, so maintenance can also be mounted on an industrial robot Is also easy. Furthermore, the present invention is applicable not only to resistance welding machines and spot welding machines, but also to other apparatuses having similar problems and advantages.
本発明の実施の１例を、図１から５を参照して説明する。
図１は、本発明の切り替え機構１を備えたスポット溶接機２を示す図である。スポット溶接機は、インバータ３、トランス４およびダイオード５などの電源構成を備えている。インバータ３は、トランス４に対して一次入力側に配置され、商用交流を直流へ変換し、高周波交流を送出する。高周波交流はトランス４およびダイオード５を介して直流に変換される。なお、冷却管６が冷却のために複数設けられており、必要な機器（図示せず）と接続される。これら構成は公知のインバータ直流式の抵抗スポット溶接機と変わるところはない。
One example of implementation of the present invention will be described with reference to FIGS.
FIG. 1 is a view showing a spot welder 2 provided with a switching mechanism 1 of the present invention. The spot welder comprises a power supply arrangement such as an inverter 3, a transformer 4 and a diode 5. The inverter 3 is disposed on the primary input side with respect to the transformer 4, converts commercial alternating current into direct current, and sends out high frequency alternating current. The high frequency alternating current is converted to direct current through the transformer 4 and the diode 5. A plurality of cooling pipes 6 are provided for cooling, and are connected to necessary devices (not shown). These configurations are no different from known inverter direct current type resistance spot welders.
そして、トランスからは第１の導電部材７である銅アームが、電極側へ向けて延出している。また、ダイオード５からは第２の導電部材８である銅アームが、電極側へ向けて延出している。一方、一対の電極９，１０が、溶接対象（図示せず）を加圧しながら溶融すべく設けられており、電極９，１０へ通電すべく、第３の導電部材１１および第４の導電部材１２が設けられている。ここで、第３の導電部材１１および第４の導電部材１２は、それぞれネジ等を介していくつかの部材が連結して構成されている。なお、サーボモータ等の加圧機構等を含めた全体の使用態様の例については図５に示している。 Then, a copper arm which is the first conductive member 7 extends from the transformer toward the electrode. Further, a copper arm which is the second conductive member 8 extends from the diode 5 toward the electrode. On the other hand, a pair of electrodes 9 and 10 are provided to melt while pressing a welding target (not shown), and third conductive member 11 and fourth conductive member are provided to supply current to electrodes 9 and 10. 12 are provided. Here, the third conductive member 11 and the fourth conductive member 12 are each configured by connecting several members via screws or the like. Note that FIG. 5 shows an example of the entire usage mode including a pressure mechanism such as a servomotor.
第１の導電部材７及び第２の導電部材８と、第３の導電部材１１及び第４の導電部材１２は、切り替え機構１により接続する対象を任意のタイミングで切り替えることができる。図２により詳細に示されるように、切り替え機構１は、回転軸１４を軸とし、一方に第１の絶縁アーム１５を、他方に第２の絶縁アーム１６を有する略板状の基体１３を備える。第１の絶縁アーム１５及び第２の絶縁アーム１６は、各々回転軸１４を軸として回動可能である。
そして、図３により詳細に示されるように、第１の絶縁アーム１５及び第２の絶縁アーム１６は、その端部に昇降機構１７，１８を備えている。昇降機構１７，１８は、シリンダ１９，２０を有しており、上下移動を行うことができる。そして、シリンダ１９，２０の上下運動は、第１の絶縁アーム１５及び第２の絶縁アーム１６の端部の回転軸２１，２２を介して、第１の絶縁アーム１５及び第２の絶縁アーム１６の回転軸１４を軸とした回動運動に変換される。
The first conductive member 7 and the second conductive member 8 and the third conductive member 11 and the fourth conductive member 12 can switch an object to be connected by the switching mechanism 1 at any timing. As shown in more detail in FIG. 2, the switching mechanism 1 is provided with a substantially plate-like base 13 having a first insulating arm 15 on one side and a second insulating arm 16 on the other side. . The first insulating arm 15 and the second insulating arm 16 are each pivotable about the rotation shaft 14.
And, as shown in more detail in FIG. 3, the first insulating arm 15 and the second insulating arm 16 are provided with elevating mechanisms 17, 18 at their ends. The elevating mechanisms 17 and 18 have cylinders 19 and 20 and can move up and down. The vertical movement of the cylinders 19 and 20 is performed by the first insulating arm 15 and the second insulating arm 16 via the rotation shafts 21 and 22 at the ends of the first insulating arm 15 and the second insulating arm 16. It is converted into rotational movement about the rotary shaft 14 of
昇降機構１７のシリンダ１９の下部には、軸２３の上下運動を可能にするためのバルブ２４，２５と、それぞれに対応して接続された空気室が設けられている。また、昇降機構１８のシリンダ２０の下部にも、軸２６の上下運動を可能にするためのバルブ２７，２８と、それぞれに対応して接続された空気室が設けられている。さらに、バルブ（注出入部）２４とバルブ２７，バルブ２５とバルブ２８は図示していないが空気ポンプや制御装置等を介して連通され、連動するように構成されている。図３の状態から、バルブ２４に空気が入ると、上側の空気室に空気が入ることで軸２３は下降し、第１の絶縁アーム１５も回転軸１４を軸に回動して上昇する。同時に、バルブ２７からバルブ２５へ空気が移動する一方、バルブ２８に空気が注入され、軸２６を押し上げる。この結果、第２の絶縁アーム１６が回転軸１４を軸に回動して上昇し、図４の状態となる。すなわち、第１の絶縁アーム１５と第２の絶縁アーム１６は、回転軸１４を軸として一方が上昇すると他方が下降するシーソーのような構造を備えている。バルブ２４，２５，２７，２８への空気の注出入は、制御装置等によりそのタイミングが制御可能である。他の構成として、単に第１の絶縁アーム１５と第２の絶縁アーム１６を一体的に形成し、昇降機構を一方の端部のみに設けることも可能である。また、昇降運動は、上記の例に限られず、油圧式シリンダや、ギア等による他の機械要素によるものを採用することも可能である。 Below the cylinder 19 of the lifting mechanism 17 are provided valves 24 and 25 for enabling the vertical movement of the shaft 23 and air chambers respectively connected correspondingly. Further, valves 27 and 28 for enabling the vertical movement of the shaft 26 and air chambers respectively connected correspondingly are also provided in the lower part of the cylinder 20 of the elevating mechanism 18. Further, although not shown, the valve (inlet / outlet portion) 24 and the valve 27, and the valve 25 and the valve 28 are communicated via an air pump, a control device or the like so as to interlock with each other. When air enters the valve 24 from the state of FIG. 3, the air enters the upper air chamber, and the shaft 23 descends, and the first insulating arm 15 also pivots about the rotation shaft 14 and ascends. At the same time, air is transferred from the valve 27 to the valve 25 while air is injected into the valve 28 to push up the shaft 26. As a result, the second insulating arm 16 pivots about the rotary shaft 14 and ascends, resulting in the state shown in FIG. That is, the first insulating arm 15 and the second insulating arm 16 have a seesaw-like structure in which one of the first insulating arm 15 and the second insulating arm 16 is lowered with the rotating shaft 14 as the axis. The timing of air injection into and out of the valves 24, 25, 27, 28 can be controlled by a control device or the like. As another configuration, it is also possible to simply form the first insulating arm 15 and the second insulating arm 16 integrally and provide the lifting mechanism only at one end. In addition, the raising and lowering motion is not limited to the above example, and it is also possible to employ a hydraulic cylinder or another mechanical element such as a gear.
第１の絶縁アーム１５には、その上下に第３の導電部材１１が配置されている。図４を参照すると、第３の導電部材１１の基体側端部は、基体１３の第１の絶縁アーム１５を上下から挟むように略コの字状に設けられており、第１の絶縁アーム１５の上下どちらからでも、電気的に接続可能に構成されている。同様に、第４の導電部材１２の基体側端部も、基体１３の第２の絶縁アーム１６を上下から挟むように略コの字状に設けられており、第２の絶縁アーム１６の上下どちらからでも、電気的に接続可能に構成されている。また、切り替え機構１はフレーム３０により維持及び保護されており、上側には第１の導電部材７が、下側には第２の導電部材８が配置されている。 Third conductive members 11 are disposed on the upper and lower sides of the first insulating arm 15. Referring to FIG. 4, the base side end of the third conductive member 11 is provided in a substantially U-shape so as to sandwich the first insulating arm 15 of the base 13 from above and below, and the first insulating arm Electrical connection is possible from either of the top and bottom of 15. Similarly, the base side end portion of the fourth conductive member 12 is also provided in a substantially U-shape so as to sandwich the second insulating arm 16 of the base 13 from the upper and lower sides, and the upper and lower sides of the second insulating arm 16 Both are configured to be electrically connectable. The switching mechanism 1 is maintained and protected by the frame 30, and the first conductive member 7 is disposed on the upper side, and the second conductive member 8 is disposed on the lower side.
そして、第１の絶縁アーム１５が上昇位置にあり、第２の絶縁アーム１６が下降した第１の位置にあるとき（図３参照）、第３の導電部材１１は第１の導電部材７にのみ接触し、第４の導電部材１２は第２の導電部材８にのみ接触している。したがって、この位置にある場合、第１の導電部材７が負極（マイナス側）であり、第２の導電部材８が正極（プラス側）であるとすれば、電極９は負極（マイナス側）、電極１０は正極（プラス側）となる。 Then, when the first insulating arm 15 is in the raised position and the second insulating arm 16 is in the lowered first position (see FIG. 3), the third conductive member 11 is the first conductive member 7. The fourth conductive member 12 contacts only the second conductive member 8. Therefore, in this position, assuming that the first conductive member 7 is the negative electrode (minus side) and the second conductive member 8 is the positive electrode (plus side), the electrode 9 is the negative electrode (minus side), The electrode 10 is a positive electrode (plus side).
次に、上述の切り替え機構１の作動により、第１の絶縁アーム１５が下降位置にあり、第２の絶縁アーム１６が上昇した第２の位置にあるとき（図４参照）、第３の導電部材１１は第２の導電部材８にのみ接触し、第４の導電部材１２は第１の導電部材７にのみ接触している。したがって、この位置にある場合、第１の導電部材７が負極（マイナス側）であり、第２の導電部材８が正極（プラス側）であるとすれば、電極９は正極（プラス側）、電極１０は負極（マイナス側）となる。 Next, when the first insulating arm 15 is in the lowered position and the second insulating arm 16 is in the raised second position (see FIG. 4) by the operation of the switching mechanism 1 described above (see FIG. 4) The member 11 contacts only the second conductive member 8, and the fourth conductive member 12 contacts only the first conductive member 7. Therefore, in this position, assuming that the first conductive member 7 is the negative electrode (minus side) and the second conductive member 8 is the positive electrode (plus side), the electrode 9 is the positive electrode (plus side), The electrode 10 is a negative electrode (minus side).
したがって、切り替え機構１の制御により、任意のタイミングで電極９と電極１０の極性を変換させることが可能となる。例えばスポット溶接機においては、打点毎に、あるいは数点ごとに変換させること等が可能となる。当該実施例では、基体１３の位置にかかわらず、第１の導電部材７に第３の導電部材１１及び第４の導電部材１２の両方が接触する瞬間はない。このため、スポット溶接以外にも、より連続的な給電を行いながら極性を変換する装置に適している。なお、当該実施例では、第３の導電部材１１及び第４の導電部材１２を移動させ接続対象を切り替えるものであるが、同様の切り替え機構１に対し、第１の導電部材７及び第２の導電部材８を移動させて接続対象を切り替えるなど、本発明の効果を奏する他の構成や素材を採用することが可能である。 Therefore, the control of the switching mechanism 1 makes it possible to change the polarity of the electrode 9 and the electrode 10 at an arbitrary timing. For example, in a spot welder, it is possible to convert every point or every few points. In this embodiment, regardless of the position of the base 13, there is no moment when both the third conductive member 11 and the fourth conductive member 12 contact the first conductive member 7. For this reason, it is suitable for the apparatus which changes polarity, performing more continuous power supply besides spot welding. In this embodiment, the third conductive member 11 and the fourth conductive member 12 are moved to switch the connection target, but the first conductive member 7 and the second conductive member 7 are used in the same switching mechanism 1. It is possible to employ other configurations or materials that achieve the effects of the present invention, such as moving the conductive member 8 to switch the connection target.
使用仕様としては、たとえば図５に示すように、アルミカバー２９，３１等により切り替え機構１等が保護される。ジャイロリング３２及びバランサー３３、バランスバー３４などを介して、上方から支持されると同時に移動可能に構成される。加圧機構としてはサーボモータ３５が使用されている。商用電源からのケーブルはケーブルホルダー３６を介して電源コネクタ３７に接続される。作業者は、ハンドル３８を使用してスポット溶接機２を移動させ、溶接を行うことができる。このように、本発明はコンパクトな構成を採用しているために、従来のスポット溶接機と同様の使用態様及び方法をそのまま維持することが可能である。また、交換など各種メンテナンスにも適している。 As the specification of use, for example, as shown in FIG. 5, the switching mechanisms 1 and the like are protected by the aluminum covers 29, 31 and the like. Through the gyro ring 32, the balancer 33, the balance bar 34 and the like, it is configured to be supported from the same time as being movable from above. A servomotor 35 is used as a pressure mechanism. The cable from the commercial power supply is connected to the power connector 37 via the cable holder 36. The operator can move the spot welder 2 using the handle 38 to perform welding. Thus, since the present invention adopts a compact configuration, it is possible to maintain the same use mode and method as the conventional spot welder. It is also suitable for various maintenance such as replacement.
本発明の他の実施の例を、図６から８を参照して説明する。図面中の符号は、先の実施例と同様の構成については統一的に使用している。図６は、切り替え機構１を備えたスポット溶接機２を示している。スポット溶接機は、インバータ３、トランス４およびダイオード５などの電源構成を備えている。インバータ３は、トランス４に対して一次入力側に配置され、商用交流から変換された高周波交流を送出する。高周波交流はトランス４およびダイオード５を介して直流に変換される。なお、冷却管６が冷却のために複数設けられており、必要な機器（図示せず）と接続される。これら構成は先の実施例と同様である。 Another embodiment of the present invention will be described with reference to FIGS. The reference numerals in the drawings are uniformly used for the same configuration as that of the previous embodiment. FIG. 6 shows a spot welder 2 provided with the switching mechanism 1. The spot welder comprises a power supply arrangement such as an inverter 3, a transformer 4 and a diode 5. The inverter 3 is disposed on the primary input side with respect to the transformer 4 and sends out high frequency alternating current converted from commercial alternating current. The high frequency alternating current is converted to direct current through the transformer 4 and the diode 5. A plurality of cooling pipes 6 are provided for cooling, and are connected to necessary devices (not shown). These configurations are the same as in the previous embodiment.
そして、トランス４からは、第１の導電部材７である導電アーム３９が、電極側へ向けて延出している。本実施例においては、後述するように、第１の導電部材７及び第２の導電部材８が移動するものであるため、トランス４の導出部４０と導電アーム３９は、図示していないケーブル等を介してシャント接続などにより電気的に接続されている。同様に、ダイオード５からは、第２の導電部材８である導電アーム４１が、電極側へ向けて延出しおり、ダイオード５の導出部と導電アーム４１は、図示しないケーブル等を介してシャント接続などにより電気的に接続され、かつ導電アーム４１が移動できるように構成されている。 A conductive arm 39, which is the first conductive member 7, extends from the transformer 4 toward the electrode. In the present embodiment, as described later, since the first conductive member 7 and the second conductive member 8 move, the lead-out portion 40 of the transformer 4 and the conductive arm 39 are cables, etc. not shown. Are electrically connected via a shunt connection or the like. Similarly, from the diode 5, the conductive arm 41 which is the second conductive member 8 extends toward the electrode side, and the lead-out portion of the diode 5 and the conductive arm 41 are shunt connected via a cable or the like not shown. And so on, and the conductive arm 41 can be moved.
導電アーム３９と導電アーム４１は、絶縁部４２を介しつつ連結されて通電部４３を構成する。ただし、絶縁部４２により、互いに電気的には接触していない。さらに通電部４３は、電極側へ延長し、端部は円筒型の導電部材４４として構成されている。図７、８においてより明らかなように、円筒型の導電部材４４において、第１の導電部材７及び第２の導電部材８は、断面が半円の筒状となっている。そして、円筒形の導電部材４４は、切り替え機構１であるモータ４５を介して、回転運動可能に構成されている。モータ４５が正逆回転すると、同軸で円筒形の導電部材４４が回転し、導電アーム３９及び導電アーム４１も回転移動する。 The conductive arm 39 and the conductive arm 41 are connected to each other via the insulating portion 42 to constitute a current-carrying portion 43. However, the insulating portions 42 do not electrically contact each other. Furthermore, the conducting part 43 extends to the electrode side, and its end is configured as a cylindrical conductive member 44. As is apparent from FIGS. 7 and 8, in the cylindrical conductive member 44, the first conductive member 7 and the second conductive member 8 have a cylindrical shape with a semicircular cross section. The cylindrical conductive member 44 is configured to be capable of rotational movement via the motor 45 that is the switching mechanism 1. When the motor 45 rotates forward and reverse, the coaxial cylindrical conductive member 44 rotates, and the conductive arm 39 and the conductive arm 41 also rotate.
一方、一対の電極９，１０からは、第３の導電部材１１および第４の導電部材１２が電源側へ向けて延出している。ここで、第３の導電部材１１および第４の導電部材１２は、それぞれネジ等を介していくつかの部材が連結して構成されている。また、第３の導電部材１１は、その端部４６において、集電ブラシ等の部材を介して円筒形の導電部材４４に電気的に接触している。また、第４の導電部材１２も同様に、その端部４７において円筒形の導電部材４４に接触している。端部４６，４７は、弾性部材４８その他の接続部材を介して、円筒型の導電部材４４に対してスライド可能な範囲の押圧力で押圧されつつ給電される。なお、図６においては理解を容易にするために、モータ４５のカバーフレーム３０（図７、８参照）や、その他のフレーム・カバー等は図示していない。 On the other hand, the third conductive member 11 and the fourth conductive member 12 extend from the pair of electrodes 9 and 10 toward the power supply side. Here, the third conductive member 11 and the fourth conductive member 12 are each configured by connecting several members via screws or the like. The third conductive member 11 is in electrical contact with the cylindrical conductive member 44 at its end 46 via a member such as a current collecting brush. Likewise, the fourth conductive member 12 is in contact with the cylindrical conductive member 44 at the end 47 thereof. The end portions 46 and 47 are supplied with power while being pressed by a pressing force in a slidable range with respect to the cylindrical conductive member 44 via the elastic member 48 and other connection members. In FIG. 6, the cover frame 30 (see FIGS. 7 and 8) of the motor 45 and the other frame / cover are not shown for easy understanding.
図７における第１の位置（鉛直方向から逆時計回に３０度回転位置）において、第３の導電部材１１の端部４６は、第１の導電部材７にのみ接触している。このとき、第４の導電部材１２の端部４７は、第２の導電部材８のみに接触している。なお、図７，図８には、円筒型の導電部材４４に設けられるカバーフレーム３０を図示している。 The end 46 of the third conductive member 11 contacts only the first conductive member 7 at the first position in FIG. 7 (the position rotated 30 degrees counterclockwise from the vertical direction). At this time, the end 47 of the fourth conductive member 12 contacts only the second conductive member 8. 7 and 8 show the cover frame 30 provided on the cylindrical conductive member 44.
モータ４５が図７の位置から６０度時計回りに回転し、図８の第２の位置になる時、第１の導電部材７及び第２の導電部材８が回転し移動する。この結果、第３の導電部材１１の端部４６は、第２の導電部材８にのみ接触している。このとき、第４の導電部材１２の端部４７は、第１の導電部材７のみに接触している。 When the motor 45 rotates 60 degrees clockwise from the position of FIG. 7 and reaches the second position of FIG. 8, the first conductive member 7 and the second conductive member 8 rotate and move. As a result, the end 46 of the third conductive member 11 contacts only the second conductive member 8. At this time, the end 47 of the fourth conductive member 12 is in contact with only the first conductive member 7.
したがって、図７の第１の位置にあるとき、第１の導電部材７が負極（マイナス側）であり、第２の導電部材８が正極（プラス側）であるとすれば、電極９は負極（マイナス側）、電極１０は正極（プラス側）となる。 Therefore, assuming that the first conductive member 7 is the negative electrode (minus side) and the second conductive member 8 is the positive electrode (plus side) when in the first position of FIG. The electrode 10 is a positive electrode (positive side).
次に、上述のモータ４５の作動により、図８の第２の位置にあるとき、第３の導電部材１１は端部４６を介し第２の導電部材８にのみ接触し、第４の導電部材１２は端部４７を介し第１の導電部材９にのみ接触している。したがって、この位置にある場合、電極９は正極（プラス側）、電極１０は負極（マイナス側）となる。なお、図示してはいないが、第１の導電部材７に第３の導電部材１１及び第４の導電部材１２の両方が接触する瞬間がないよう、円筒型の導電部材４４の表面の一部に絶縁部材を設けても良い。 Next, the third conductive member 11 contacts only the second conductive member 8 through the end 46 when in the second position of FIG. 8 by the operation of the motor 45 described above, and the fourth conductive member 12 contacts only the first conductive member 9 through the end 47. Therefore, in this position, the electrode 9 is a positive electrode (plus side), and the electrode 10 is a negative electrode (minus side). Although not shown, a portion of the surface of the cylindrical conductive member 44 is provided so that there is no moment when both the third conductive member 11 and the fourth conductive member 12 contact the first conductive member 7. May be provided with an insulating member.
したがって、当該実施例においても、切り替え機構１の制御により、任意のタイミングで電極９と電極１０の極性を変換させることが可能となる。当該実施例では、第１の導電部材７及び第２の導電部材８を回転移動させ接続対象を切り替えるものであるが、第３の導電部材１１及び第４の導電部材１２側を回転移動させて接続対象を切り替える態様など、本発明の効果を奏する他の構成や素材を採用することが可能である。 Therefore, also in this embodiment, the control of the switching mechanism 1 makes it possible to change the polarity of the electrodes 9 and 10 at an arbitrary timing. In this embodiment, the first conductive member 7 and the second conductive member 8 are rotationally moved to switch the connection target, but the third conductive member 11 and the fourth conductive member 12 are rotationally moved. It is possible to employ other configurations or materials that produce the effects of the present invention, such as a mode of switching connection targets.
１：切り替え機構 ２：スポット溶接機，
３：インバータ ４：トランス
５：ダイオード ６：冷却管
７：第１の導電部材 ８：第２の導電部材
９：電極 １０：電極
１１：第３の導電部材 １２：第４の導電部材
１３：基体 １４：回転軸
１５：第１の絶縁アーム １６：第２の絶縁アーム
１７：昇降機構 １８：昇降機構
１９：シリンダ ２０：シリンダ
２１：回転軸 ２２：回転軸
２３：軸 ２４：バルブ
２５：バルブ ２６：軸
２７：バルブ ２８：バルブ
２９：アルミカバー ３０：フレーム
３１：アルミカバー ３２：ジャイロリング
３３：バランサー ３４：バランスバー
３５：サーボモータ ３６：ケーブルホルダー
３７：電源コネクタ ３８：ハンドル
３９：導電アーム ４０：導出部
４１：導電アーム ４２：絶縁部
４３：通電部 ４４：円筒型の導電部材
４５：モータ ４６：端部
４７：端部 ４８：弾性部材
1: Switching mechanism 2: Spot welder,
3: inverter 4: transformer 5: diode 6: cooling tube 7: first conductive member 8: second conductive member 9: electrode 10: electrode 11: third conductive member 12: fourth conductive member 13: base 14: rotating shaft 15: first insulating arm 16: second insulating arm 17: lifting mechanism 18: lifting mechanism 19: cylinder 20: cylinder 21: rotating shaft 22: rotating shaft 23: shaft 24: valve 25: valve 26 Axle 27: Valve 28: Valve 29: Aluminum cover 30: Frame 31: Aluminum cover 32: Gyro ring 33: Balancer 34: Balance bar 35: Servo motor 36: Cable holder 37: Power connector 38: Handle 39: Conductive arm 40 : Derivation part 41: Conducting arm 42: Insulating part 43: Conducting part 44: Cylindrical conductive member 45: Motor 46: End 47: End 48: Elastic member
Claims (13)
対象物へ電流を流すための一対の電極と接続された第３及び第４の導電部材とを接続するスイッチ機構であり、
第３及び第４の導電部材が、第１の導電部材及び第２の導電部材のいずれにも接続可能であって、
第３の導電部材が第１の導電部材に接続している場合は第２の導電部材には接続せず、かつ第４の導電部材が第２の導電部材に接続し、
第３の導電部材が第２の導電部材に接続している場合は第１の導電部材には接続せず、かつ第４の導電部材が第１の導電部材に接続し、
第３の導電部材が接続する部材を、第１の導電部材及び第２の導電部材のいずれかにおいて選択的に切り替える機構を備えたスイッチ機構。 A first conductive member and a second conductive member derived from a power source;
A switch mechanism for connecting a third and a fourth conductive member connected to a pair of electrodes for flowing current to an object,
The third and fourth conductive members are connectable to any of the first conductive member and the second conductive member,
When the third conductive member is connected to the first conductive member, it is not connected to the second conductive member, and the fourth conductive member is connected to the second conductive member,
When the third conductive member is connected to the second conductive member, it is not connected to the first conductive member, and the fourth conductive member is connected to the first conductive member,
The switch mechanism provided with the mechanism which selectively switches the member which a 3rd electroconductive member connects in either a 1st electroconductive member and a 2nd electroconductive member.
切り替え機構が昇降機構と接続された絶縁性の基体を含み、
当該基体は、第１及び第２の導電部材、または第３及び第４の導電部材と接続され、昇降運動による基体の移動により接続する対象が切り替えられるものであることを特徴とする請求項３に記載のスイッチ機構。 The moving mechanism is the lifting mechanism,
The switching mechanism includes an insulating substrate connected to the lifting mechanism;
The substrate is connected to the first and second conductive members or the third and fourth conductive members, and the object to be connected is switched by the movement of the substrate by the elevating movement. The switch mechanism described in.
対象物へ電流を流すための一対の電極と接続された第３及び第４の導電部材とを接続するスイッチ機構であり、
第３及び第４の導電部材が、第１の導電部材及び第２の導電部材のいずれにも接続可能であって、
第３の導電部材が第１の導電部材に接続している第１の位置において第２の導電部材には接続せず、かつ第４の導電部材が第２の導電部材に接続し、
第３の導電部材が第２の導電部材に接続している第２の位置において第１の導電部材には接続せず、かつ第４の導電部材が第１の導電部材に接続し、
第３の導電部材が接続する部材を、第１の導電部材及び第２の導電部材のいずれかにおいて選択的に切り替える機構を備えたスイッチ機構。 A first conductive member and a second conductive member derived from a power source;
A switch mechanism for connecting a third and a fourth conductive member connected to a pair of electrodes for flowing current to an object,
The third and fourth conductive members are connectable to any of the first conductive member and the second conductive member,
Not connected to the second conductive member at a first position where the third conductive member is connected to the first conductive member, and the fourth conductive member is connected to the second conductive member,
Not connected to the first conductive member at the second position where the third conductive member is connected to the second conductive member, and the fourth conductive member is connected to the first conductive member,
The switch mechanism provided with the mechanism which selectively switches the member which a 3rd electroconductive member connects in either a 1st electroconductive member and a 2nd electroconductive member.
The spot welding machine provided with the switch mechanism of any one of Claims 9-12.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6240979A (en) * | 1985-08-15 | 1987-02-21 | Dengensha Mfg Co Ltd | Rectification type resistance welding method |
| JPH01159974U (en) * | 1988-04-21 | 1989-11-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6240979A (en) * | 1985-08-15 | 1987-02-21 | Dengensha Mfg Co Ltd | Rectification type resistance welding method |
| JPH01159974U (en) * | 1988-04-21 | 1989-11-07 |
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