JP4691805B2

JP4691805B2 - Wire cutting device

Info

Publication number: JP4691805B2
Application number: JP2001058826A
Authority: JP
Inventors: 清平瀬
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2001-03-02
Filing date: 2001-03-02
Publication date: 2011-06-01
Anticipated expiration: 2021-03-02
Also published as: JP2002253875A

Description

【０００１】
【発明の属する技術分野】
本発明は、ワイヤ切断装置に関する。
【０００２】
【従来の技術】
半導体素子を基板の回路電極と電気的に接続する方法としてワイヤボンディングが広く用いられている。このワイヤボンディングにおいては、ワイヤはワイヤボンディング装置の電極となるチャックに把持され、例えば、半導体素子の外部接続用電極等の接合物にワイヤの端面が押圧され、電気が導通されて溶解され、接合物と溶接される。この状態のワイヤを上記チャックを移動させることにより基板の回路電極等の所望の接続点まで引き回して接合が行われる。このようなボンディング動作においては、ワイヤは連続した線として供給されるため、ワイヤをボンディング動作毎に切断する必要がある。又、この切断でワイヤは、次のボンディングが行えるようにチャックからワイヤが少し突出した状態になるように切断される。
【０００３】
従来のワイヤ切断装置には、図４（ａ）及び図４（ｂ）に示されたような、チャック３３によって把持されたワイヤを、ペンチのように鋭角の切刃を持つ一対の切断具４１で挟み、その切刃を突き合わせることによって切断する装置（図４（ａ））と、鋏のように一対の切断具４３を互いに交差させてせん断力により切断する装置（図４（ｂ））等がある。
【０００４】
しかしながら、ペンチ式の装置では、図４（ａ）に示したようにワイヤ４５の切断面が中央の盛り上がった山形となるため、ワイヤボンディングのようにワイヤ端面を接合物に押圧し、電気を導通させて溶解して溶接する場合には、溶接条件が安定せずに良好な溶接状態が得られないという問題があった。
【０００５】
又、鋏式の装置では、図４（ｂ）に示したように切断後にワイヤ４７の切断面近傍の部分が切断具４３によって押されて曲がり、ワイヤ４７の先端位置がずれてしまうため、ワイヤ４７の端面を所望の接合位置に押圧するのが困難になるという問題があった。
【０００６】
【発明が解決しようとする課題】
本発明は、上記問題に鑑みてなされたもので、切断後のワイヤの曲がりがなく、切断面が平面となるように切断可能なワイヤ切断装置を提供する。
【０００７】
【課題を解決するための手段】
本発明は、上記課題を解決するための手段として、特許請求の範囲の各請求項に記載されたワイヤ切断装置を提供する。
【０００８】
請求項１に記載の発明によれば、第一切断部材のワイヤへ向かう回転移動をワイヤに当接した位置で停止させる停止手段と第二切断部材のワイヤに向かう回転移動に負荷を与える負荷手段とが設けられているので、まず第一切断部材が回転移動し、停止手段により停止されて切断されるワイヤを位置決めし、次いで第二切断部材が回転移動して第一切断部材に交差することによってワイヤにせん断力をかけて切断するという切断工程が実現される。請求項１に記載の発明によれば、この切断時に、第一切断部材は第二切断部材に比べて把持手段側に位置するように取付けられているので、切断の際には、ワイヤの切断される部分は把持手段側において第一切断部材によって当接支持されている。この状態で第一切断部材の把持手段から遠い側に第二切断部材を交差させてワイヤにせん断力をかけて切断するため、切断後も把持手段に把持されている側のワイヤには曲がりがなく、その先端部が位置決めされた位置に保持されると共に、切断面が平面となるように切断することが出来る。これによりワイヤボンディングにおいて、切断面が平面であるために溶接条件が安定して良好な溶接状態が得られると共に、切断面が位置決めされた位置に保持されているのでワイヤの端部（切断面）の所望の接合位置への位置合わせが容易になる。
【０００９】
又、駆動手段がベース部材に回転可能に取付けられているため、駆動手段は、その向きを停止手段及び負荷手段の作用との関係により自動的に調整されて第一切断部材及び第二切断部材を駆動するようになるので、複雑な動力伝達機構を付加することなく、上述したような第一切断部材による位置決め後に第二切断部材が作動してワイヤを切断するという工程が実現される。
【００１０】
【発明の実施の形態】
以下、図面を参照して、本発明の実施形態について詳細に説明する。尚、図面において、同一又は類似の構成要素には共通の参照番号を付す。
【００１１】
図１は、本発明の一実施形態であるワイヤ切断装置１の上面図である。図１で、３はベース部、５は第一切断部材、７は第二切断部材、１５は駆動手段を示す。
【００１２】
第一切断部材５は図１に示すように全体としてほぼ棒状の部材であり、その中央部分に取付穴（図示なし）を有する取付突起部６を有していて、取付穴を鉛直方向に貫通して取付けられる取付ピン１３によりベース部３に水平方向に回転可能に取付けられる。又、第一切断部材５はその一端部に切刃部９を備えており、この切刃部９には切断時にワイヤを受容するための切欠きが設けられている。第一切断部材５の他方の端部は駆動手段１５の一部である動力伝達部２１に取付けられる。第二切断部材７は、第一切断部材５とほぼ同一の構成を有しており、第一切断部材５に相対するようにして、第一切断部材５と同様に、その中央部分に設けられた取付突起部８の取付穴（図示なし）を鉛直方向に貫通する取付ピン１３によりベース部３に水平方向に回転可能に取付けられる。又、第二切断部材７の一端部にも切刃部１１が設けられ、この切刃部１１も又、切断時にワイヤを受容するための切欠きを有している。第二切断部材７の他方の端部は、第一切断部材５と同様に駆動手段１５の一部である動力伝達部２１に取付けられる。尚、本実施形態において第一切断部材５と第二切断部材７は、ベース部３を下方にして、ベース部３の上に第二切断部材７が位置し、第二切断部材７の上に第一切断部材５が位置するように取付けられる。つまり、第一切断部材５の切刃部９と第二切断部材７の切刃部１１が互いに交差するように両切断部材５、７が回転移動された場合、第一切断部材５の切刃部９が第二切断部材７の切刃部１１の上方に位置するようにされる。
【００１３】
本実施形態において駆動手段１５は、図１に示したように、駆動部２０と、駆動部２０の駆動部分に取付けられた動力伝達部２１とから構成されており、駆動部２０の駆動部分とは反対側の部分においてベース部３に回転可能に取付けられている。駆動部２０は、動力伝達部２１に連結されている駆動部分を直線的に伸縮させ、往復移動させる。又、動力伝達部２１は、図１に示すように３つの短い棒状部材、即ち第一部材２３、第二部材２５、第三部材２７が、各部材の一端で他の二つの部材の一端に回転可能に取付けられて構成されたものである。第一部材２３、第二部材２５、第三部材２７の他端は夫々、駆動部２０の駆動部分、第一切断部材５の端部、第二切断部材７の端部へ取付けられる。この際、第二部材２５と第一切断部材５の端部、及び、第三部材２７と第二切断部材７の端部は、夫々回転可能に取付けられる。このような構成とすることで、駆動部２０の駆動部分の直線的移動により第一切断部材５及び第二切断部材７を回転移動させることが可能となる。
【００１４】
本実施形態のワイヤ切断装置１には更に、停止手段１７及び負荷手段１９が設けられている。
【００１５】
停止手段１７は、第一切断部材５が駆動手段１５の作用によって、第一切断部材５の切刃部９が第二切断部材７の切刃部１１に接近する方向、即ち、切断するワイヤがある場合にはそのワイヤに向かう方向に回転移動する場合に、その回転移動が所定の位置に達した時に第一切断部材５に当接して回転移動を制限する役割を果たす。図１に示したように、本実施形態において停止手段１７は、第一切断部材５及び第二切断部材７が取付けられているベース部３の上部平面に対しほぼ垂直に延設された停止手段取付壁１６に取付けられたボルト状部材１７であり、第一切断部材５の取付突起部６とは反対側の、中央よりも駆動手段１５側の部分で第一切断部材５に当接するように配設されている。このボルト状部材１７を回転させて移動することにより第一切断部材５との当接位置を変更し、第一切断部材５の切刃部９の停止位置を調節することが可能である。
【００１６】
一方、負荷手段１９は、第二切断部材７が駆動手段１５の作用によって、第二切断部材７の切刃部１１が第一切断部材５の切刃部９に接近する方向、即ち、切断するワイヤがある場合にはそのワイヤに向かう方向に回転移動しようとする場合に、その回転移動に負荷を与え、回転移動させようとする駆動力が所定の値に達するまで第二切断部材７の回転移動を生じさせないようにする役割を果たす。図１に示したように、本実施形態において負荷手段１９は、第一切断部材５及び第二切断部材７が取付けられているベース部３の上部平面に対しほぼ垂直に延設された負荷手段取付壁１８と、第二切断部材７の取付突起部８とは反対側の、中央よりも駆動手段１５側の部分との間に取付けられたばね部材１９である。負荷手段１９としては、ばね部材以外の任意の適切な弾性部材を用いることも出来る。
【００１７】
更に、図１に示すように、ベース部３の上部平面上には、第一切断部材５の中央より駆動手段１５側の部分と第二切断部材７の中央より駆動手段１５側の部分との間に位置して、止め部材２９が設けられている。駆動手段１５の駆動部分が収縮して、第一切断部材５の切刃部９と第二切断部材７の切刃部１１が互いに離れる方向に回転移動する場合に、第一切断部材５の中央より駆動手段１５側の部分及び第二切断部材７の中央より駆動手段１５側の部分がこの止め部材２９に当接し、所定の位置で上記回転移動が停止する。
【００１８】
次に、図２及び図３を参照して、本実施形態のワイヤ切断装置１の作動について説明する。図２は、一連のワイヤ３１の切断工程におけるワイヤ切断装置１の動作を示す上面図であり、図２（ａ）、図２（ｂ）、図２（ｃ）は夫々、開始段階、位置決め段階、切断段階を示している。又、図３は、ワイヤ切断装置１によるワイヤ３１の切断工程を取付ピン１３のところから二つの切断部材５、７の切刃部９、１１を有する端部に向かって見た場合の図であり、図２の場合と同様、図３（ａ）、図３（ｂ）、図３（ｃ）は夫々、開始段階、位置決め段階、切断段階に対応している。図３の各図において切刃部９、１１は、それぞれの切欠きの中央部でとった断面で示されている。尚、本実施形態においては、切断されるワイヤ３１は、図３の各図に示したようにワイヤ切断装置１の上方に位置する把持手段としてのチャック３３により鉛直方向下方に向けて把持されている。
【００１９】
図２（ａ）及び図３（ａ）に示された開始段階においては、駆動手段１５の駆動部２０の駆動部分が収縮した状態にあり、二つの切断部材５、７の切刃部９、１１は最も離間した状態にあって、チャック３３により把持されたワイヤ３１は二つの切刃部９、１１の間にある。この段階においてはどちらの切刃部９、１１もワイヤ３１には接触していない。
【００２０】
切断工程は、この開始段階から駆動手段１５の駆動部２０の駆動部分が伸長することにより始まる。駆動部２０の駆動部分の伸長が始まると動力伝達部２１の作用により、二つの切断部材５、７の夫々に、各切断部材５、７を切刃部９、１１が互いに接近する方向、即ち、切断するワイヤ３１に向かう方向に回転させる力が作用する。しかしながら、第二切断部材７には、上述のように負荷手段１９が作用しているために回転移動は生ぜず、駆動部２０の駆動部分の伸長の初期の段階においては第一切断部材５のみが回転移動する。この際、駆動部分が伸長するにも拘わらず第二切断部材７が負荷手段１９の作用により移動しないので、駆動手段１５は第一切断部材５側に僅かに回転するようにして向きを変える。第一切断部材５の回転は、図２（ｂ）に示すように、第一切断部材５が第一切断部材５の取付突起部６とは反対側の、中央よりも駆動手段１５側の部分で停止手段１７に当接するまで続く。停止手段１７は、第一切断部材５の回転移動を、図２（ｂ）及び図３（ｂ）に示すように、第一切断部材５の切刃部９がワイヤ３１に当接して、ワイヤ３１をチャック３３の中心軸線上に位置決めする位置で停止するように調節されている。
【００２１】
図２（ｂ）及び図３（ｂ）に示した位置決め段階から更に駆動部２０の駆動部分が伸長すると、第一切断部材５が停止手段１７に当接してそれ以上回転移動できないために、第二切断部材７を回転させようとする駆動力が増加し、負荷手段１９の負荷に抗して第二切断部材７を回転させ始める。この際、駆動手段１５は第二切断部材７側へ戻って回転し、向きを変える。この第二切断部材７の回転移動の結果、図２（ｃ）及び図３（ｃ）に示したように、ワイヤ３１に当接してワイヤ３１を位置決めしている第一切断部材５の切刃部９の下、即ちチャック３３から遠い側に、第二切断部材７の切刃部１１が鉛直方向に把持されたワイヤ３１を水平方向に横断して交差し、せん断力によりワイヤ３１が切断される。
【００２２】
以上のような切断工程とすることにより、切断後もチャック３３に把持されている側のワイヤ３１ａには曲がりがなく、その先端部を位置決めされたチャック３３の中心軸線上に保持することが出来ると共に切断面をワイヤ３１ａの中心軸線に直角な平面とすることが出来る（図３（ｃ））。又、本実施形態のワイヤ切断装置１においては、第一切断部材５のワイヤ３１へ向かう回転移動をワイヤ３１に当接した位置で停止させる停止手段１７と第二切断部材７のワイヤ３１に向かう回転移動に負荷を与える負荷手段１９とを設けると共に、駆動手段１５をベース部材３に回転可能に取付けることによって、複雑な動力伝達機構を付加することなく、且つ一つの駆動手段１５のみを用いて、上述したような第一切断部材５による位置決め後に第二切断部材７が作動してワイヤを切断するという工程を実現している。
【００２３】
以上の説明から明らかなように、本実施形態によれば、第一切断部材５を、ワイヤ３１の切断時に第二切断部材７に比べて把持手段３３側に位置するように取付け、第一切断部材５のワイヤ３１へ向かう回転移動をワイヤ３１に当接した位置で停止させる停止手段１７と第二切断部材７のワイヤ３１に向かう回転移動に負荷を与える負荷手段１９とを設けることによって、まず第一切断部材５が回転移動し、停止手段１７により停止されて切断されるワイヤ３１をチャック３３の中心軸線上に位置決めし、次いで第二切断部材７が回転移動して第一切断部材５のチャック３３から遠い側に、鉛直方向に把持されたワイヤ３１に対して垂直に交差することによってワイヤ３１にせん断力をかけて切断するという切断工程が実現され、それによって、切断後もチャック３３に把持されている側のワイヤ３１ａには曲がりがなく、その先端部を位置決めされたチャック３３の中心軸線上に保持すると共に切断面をワイヤ３１ａの中心軸線に直角な平面とすることが出来る。これによりワイヤボンディングにおいて、切断面が平面であるために溶接条件が安定して良好な溶接状態が得られると共に、切断面が位置決めされたチャック３３の中心軸線上に保持されるのでワイヤ３１ａの端部（切断面）の所望の接合位置への位置合わせが容易になる。
【図面の簡単な説明】
【図１】図１は、本発明の一実施形態であるワイヤ切断装置の上面図である。
【図２】図２は、一連のワイヤの切断工程における図１のワイヤ切断装置の動作を示す上面図であり、図２（ａ）、図２（ｂ）、図２（ｃ）は夫々、開始段階、位置決め段階、切断段階を示している。
【図３】図３は、図１のワイヤ切断装置によるワイヤの切断工程を両切断部材の取付ピン側から見た場合の図であり、図２の場合と同様、図３（ａ）、図３（ｂ）、図３（ｃ）は夫々、開始段階、位置決め段階、切断段階に対応している。
【図４】従来技術のワイヤ切断装置によるワイヤ切断の様子を示す図であり、図４（ａ）はペンチ式切断装置による切断を示し、図４（ｂ）は鋏式切断装置による切断を示す。
【符号の説明】
１…ワイヤ切断装置
３…ベース部
５…第一切断部材
６…取付突起部
７…第二切断部材
８…取付突起部
９…切刃部
１１…切刃部
１３…取付ピン
１５…駆動手段
１６…停止手段取付壁
１７…停止手段
１８…負荷手段取付壁
１９…負荷手段
２０…駆動部
２１…動力伝達部
２３…第一部材
２５…第二部材
２７…第三部材
２９…止め部材
３１…ワイヤ
３３…チャック[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wire cutting device .
[0002]
[Prior art]
Wire bonding is widely used as a method for electrically connecting a semiconductor element to a circuit electrode of a substrate. In this wire bonding, the wire is gripped by a chuck, which is an electrode of a wire bonding apparatus, and the end surface of the wire is pressed against a bonded object such as an external connection electrode of a semiconductor element, and electricity is conducted and melted. Welded with objects. Bonding is performed by moving the wire in this state to a desired connection point such as a circuit electrode of the substrate by moving the chuck. In such a bonding operation, since the wire is supplied as a continuous line, it is necessary to cut the wire for each bonding operation. Further, by this cutting, the wire is cut so that the wire slightly protrudes from the chuck so that the next bonding can be performed.
[0003]
In the conventional wire cutting device, a pair of cutting tools 41 having a cutting edge with an acute angle like a pliers, as shown in FIG. 4A and FIG. And a device that cuts by cutting the pair of cutting tools 43 like a scissors (Fig. 4 (b)). Etc.
[0004]
However, in the pliers-type device, as shown in FIG. 4A, the cut surface of the wire 45 has a raised ridge shape at the center, so that the wire end surface is pressed against the joint to conduct electricity as in wire bonding. In the case of melting and welding, the welding conditions are not stable, and there is a problem that a good welding state cannot be obtained.
[0005]
In addition, in the saddle type apparatus, as shown in FIG. 4B, a portion near the cut surface of the wire 47 is pushed and bent by the cutting tool 43 after cutting, and the tip position of the wire 47 is shifted. There is a problem that it becomes difficult to press the end face of 47 to a desired joining position.
[0006]
[Problems to be solved by the invention]
This invention is made | formed in view of the said problem, and provides the wire cutting device which can be cut | disconnected so that there may be no bending of the wire after a cutting | disconnection and a cut surface may become a plane.
[0007]
[Means for Solving the Problems]
The present invention provides, as means for solving the above-mentioned problems, a wire cutting device described in each claim.
[0008]
According to the first aspect of the present invention, the stopping means for stopping the rotational movement of the first cutting member toward the wire at the position in contact with the wire and the load means for applying a load to the rotational movement of the second cutting member toward the wire. The first cutting member is rotated and moved first, the wire to be cut is stopped by the stopping means, and then the second cutting member is rotated and moved to intersect the first cutting member. By this, a cutting process of cutting the wire by applying a shearing force is realized. According to the first aspect of the present invention, at the time of cutting, the first cutting member is attached so as to be positioned closer to the gripping means than the second cutting member. The portion to be touched is supported by the first cutting member on the gripping means side. In this state, the second cutting member is crossed on the side farther from the gripping means of the first cutting member and shearing is applied to the wire to cut the wire. In addition, the front end portion can be held at the positioned position, and the cut surface can be cut to be a flat surface. As a result, in wire bonding, since the cut surface is flat, the welding conditions are stable and a good welded state can be obtained, and the end of the wire (cut surface) since the cut surface is held at the positioned position. Alignment to a desired joining position becomes easy.
[0009]
In addition , since the driving means is rotatably attached to the base member, the driving means is automatically adjusted in its direction according to the relationship between the stopping means and the load means, and the first cutting member and the second cutting member. Therefore, the step of operating the second cutting member and cutting the wire after positioning by the first cutting member as described above is realized without adding a complicated power transmission mechanism.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or similar components are denoted by common reference numerals.
[0011]
FIG. 1 is a top view of a wire cutting device 1 according to an embodiment of the present invention. In FIG. 1, 3 is a base part, 5 is a 1st cutting member, 7 is a 2nd cutting member, 15 shows a drive means.
[0012]
As shown in FIG. 1, the first cutting member 5 is a substantially rod-like member as a whole, and has a mounting projection 6 having a mounting hole (not shown) at the center thereof, and penetrates the mounting hole in the vertical direction. The mounting pin 13 is attached to the base portion 3 so as to be rotatable in the horizontal direction. The first cutting member 5 has a cutting edge portion 9 at one end thereof, and the cutting edge portion 9 is provided with a notch for receiving a wire during cutting. The other end of the first cutting member 5 is attached to a power transmission unit 21 that is a part of the driving means 15. The second cutting member 7 has substantially the same configuration as the first cutting member 5, and is provided at the central portion thereof in the same manner as the first cutting member 5 so as to face the first cutting member 5. The mounting protrusions 8 (not shown) of the mounting protrusions 8 are attached to the base portion 3 so as to be rotatable in the horizontal direction by mounting pins 13 penetrating in the vertical direction. Moreover, the cutting blade part 11 is provided also in the one end part of the 2nd cutting member 7, and this cutting blade part 11 also has a notch for receiving a wire at the time of a cutting | disconnection. The other end of the second cutting member 7 is attached to a power transmission unit 21 that is a part of the driving means 15, similarly to the first cutting member 5. In addition, in this embodiment, the 1st cutting member 5 and the 2nd cutting member 7 turn the base part 3 downward, the 2nd cutting member 7 is located on the base part 3, and on the 2nd cutting member 7 It attaches so that the 1st cutting member 5 may be located. That is, when the cutting members 5 and 7 are rotated so that the cutting blade portion 9 of the first cutting member 5 and the cutting blade portion 11 of the second cutting member 7 intersect each other, the cutting blade of the first cutting member 5 The part 9 is positioned above the cutting edge part 11 of the second cutting member 7.
[0013]
In the present embodiment, as shown in FIG. 1, the drive unit 15 includes a drive unit 20 and a power transmission unit 21 attached to the drive part of the drive unit 20. Is rotatably attached to the base portion 3 at the opposite side portion. The drive unit 20 linearly expands and contracts the drive part connected to the power transmission unit 21 to reciprocate. In addition, as shown in FIG. 1, the power transmission unit 21 includes three short rod-shaped members, that is, a first member 23, a second member 25, and a third member 27 at one end of each member and at one end of the other two members. It is configured to be rotatably mounted. The other ends of the first member 23, the second member 25, and the third member 27 are attached to the drive portion of the drive unit 20, the end of the first cutting member 5, and the end of the second cutting member 7, respectively. At this time, the end portions of the second member 25 and the first cutting member 5 and the end portions of the third member 27 and the second cutting member 7 are rotatably attached, respectively. By setting it as such a structure, it becomes possible to rotationally move the 1st cutting member 5 and the 2nd cutting member 7 by the linear movement of the drive part of the drive part 20. As shown in FIG.
[0014]
The wire cutting device 1 of the present embodiment is further provided with a stopping means 17 and a load means 19.
[0015]
The stopping means 17 is such that the first cutting member 5 is driven by the action of the driving means 15 so that the cutting edge portion 9 of the first cutting member 5 approaches the cutting edge portion 11 of the second cutting member 7, that is, the wire to be cut In some cases, when rotating in the direction toward the wire, when the rotational movement reaches a predetermined position, it contacts the first cutting member 5 and serves to limit the rotational movement. As shown in FIG. 1, in this embodiment, the stopping means 17 is a stopping means extending substantially perpendicular to the upper plane of the base portion 3 to which the first cutting member 5 and the second cutting member 7 are attached. It is a bolt-shaped member 17 attached to the attachment wall 16, and comes into contact with the first cutting member 5 at a portion of the first cutting member 5 on the side of the driving means 15 on the side opposite to the attachment projection 6. It is arranged. By rotating and moving the bolt-shaped member 17, the contact position with the first cutting member 5 can be changed, and the stop position of the cutting edge portion 9 of the first cutting member 5 can be adjusted.
[0016]
On the other hand, the load means 19 cuts the second cutting member 7 in the direction in which the cutting blade portion 11 of the second cutting member 7 approaches the cutting blade portion 9 of the first cutting member 5, that is, by the action of the driving means 15. When there is a wire, when it is going to rotate and move in the direction toward the wire, the rotation of the second cutting member 7 is applied until the driving force to apply the load and to move the rotation reaches a predetermined value. Plays the role of preventing movement. As shown in FIG. 1, in this embodiment, the load means 19 is a load means extending substantially perpendicular to the upper plane of the base portion 3 to which the first cutting member 5 and the second cutting member 7 are attached. A spring member 19 is mounted between the mounting wall 18 and a portion of the second cutting member 7 opposite to the mounting projection 8 and closer to the drive means 15 than the center. As the load means 19, any appropriate elastic member other than the spring member can be used.
[0017]
Further, as shown in FIG. 1, on the upper plane of the base portion 3, there are a portion on the driving means 15 side from the center of the first cutting member 5 and a portion on the driving means 15 side from the center of the second cutting member 7. A stop member 29 is provided in between. When the drive portion of the drive means 15 contracts and the cutting blade portion 9 of the first cutting member 5 and the cutting blade portion 11 of the second cutting member 7 rotate and move away from each other, the center of the first cutting member 5 The portion closer to the drive means 15 and the portion closer to the drive means 15 than the center of the second cutting member 7 abut against the stop member 29, and the rotational movement stops at a predetermined position.
[0018]
Next, with reference to FIG.2 and FIG.3, the action | operation of the wire cutting device 1 of this embodiment is demonstrated. FIG. 2 is a top view showing the operation of the wire cutting device 1 in the series of wire 31 cutting steps. FIGS. 2A, 2B, and 2C are a start stage and a positioning stage, respectively. Shows the cutting stage. FIG. 3 is a view when the cutting process of the wire 31 by the wire cutting device 1 is viewed from the attachment pin 13 toward the end of the two cutting members 5 and 7 having the cutting blade portions 9 and 11. Yes, as in FIG. 2, FIGS. 3 (a), 3 (b), and 3 (c) correspond to a start stage, a positioning stage, and a cutting stage, respectively. In each drawing of FIG. 3, the cutting blade portions 9 and 11 are shown in a cross section taken at the center of each notch. In the present embodiment, the wire 31 to be cut is gripped downward in the vertical direction by a chuck 33 as gripping means located above the wire cutting device 1 as shown in each drawing of FIG. Yes.
[0019]
2 (a) and 3 (a), the drive portion of the drive unit 20 of the drive means 15 is in a contracted state, and the cutting blade portions 9 of the two cutting members 5, 7 are provided. 11 is the most separated state, and the wire 31 held by the chuck 33 is between the two cutting blade portions 9 and 11. At this stage, neither cutting edge portion 9 or 11 is in contact with the wire 31.
[0020]
The cutting process starts when the drive portion of the drive unit 20 of the drive means 15 extends from this starting stage. When extension of the drive part of the drive part 20 starts, the action of the power transmission part 21 causes each of the cutting members 5 and 7 to approach the two cutting members 5 and 7 in the direction in which the cutting blade parts 9 and 11 approach each other, that is, A force to rotate in the direction toward the wire 31 to be cut acts. However, since the load means 19 acts on the second cutting member 7 as described above, no rotational movement occurs, and only the first cutting member 5 is present at the initial stage of extension of the drive portion of the drive unit 20. Will rotate. At this time, since the second cutting member 7 does not move due to the action of the load means 19 even though the driving portion is extended, the driving means 15 changes its direction so as to rotate slightly toward the first cutting member 5 side. As shown in FIG. 2B, the rotation of the first cutting member 5 is a portion of the first cutting member 5 on the side of the driving means 15 from the center on the side opposite to the mounting projection 6 of the first cutting member 5. The process continues until the stop means 17 comes into contact. As shown in FIGS. 2 (b) and 3 (b), the stopping means 17 causes the cutting blade portion 9 of the first cutting member 5 to come into contact with the wire 31 as shown in FIGS. 31 is adjusted to stop at a position for positioning the chuck 31 on the central axis of the chuck 33.
[0021]
When the drive portion of the drive unit 20 is further extended from the positioning stage shown in FIGS. 2B and 3B, the first cutting member 5 abuts against the stop means 17 and cannot move further. The driving force for rotating the second cutting member 7 increases, and the second cutting member 7 starts to rotate against the load of the load means 19. At this time, the driving means 15 rotates back to the second cutting member 7 side and changes its direction. As a result of the rotational movement of the second cutting member 7, as shown in FIG. 2C and FIG. 3C, the cutting blade of the first cutting member 5 that contacts the wire 31 and positions the wire 31 Under the portion 9, that is, on the side far from the chuck 33, the cutting blade portion 11 of the second cutting member 7 crosses the wire 31 gripped in the vertical direction in the horizontal direction, and the wire 31 is cut by the shearing force. The
[0022]
By performing the cutting process as described above, the wire 31a on the side gripped by the chuck 33 is not bent even after cutting, and the tip portion can be held on the center axis of the chuck 33 positioned. At the same time, the cut surface can be a plane perpendicular to the central axis of the wire 31a (FIG. 3C). Moreover, in the wire cutting device 1 of this embodiment, the stop means 17 for stopping the rotational movement of the first cutting member 5 toward the wire 31 at the position in contact with the wire 31 and the wire 31 of the second cutting member 7 are directed. A load means 19 for applying a load to the rotational movement is provided, and the drive means 15 is rotatably attached to the base member 3, so that no complicated power transmission mechanism is added and only one drive means 15 is used. Then, after the positioning by the first cutting member 5 as described above, the second cutting member 7 operates to cut the wire.
[0023]
As is clear from the above description, according to the present embodiment, the first cutting member 5 is attached so as to be positioned closer to the gripping means 33 than the second cutting member 7 when the wire 31 is cut. First, by providing the stopping means 17 for stopping the rotational movement of the member 5 toward the wire 31 at a position in contact with the wire 31 and the load means 19 for applying a load to the rotational movement of the second cutting member 7 toward the wire 31, The first cutting member 5 rotates and positions the wire 31 that is stopped and cut by the stopping means 17 on the central axis of the chuck 33, and then the second cutting member 7 rotates and moves the first cutting member 5. On the side far from the chuck 33, a cutting process is realized in which the wire 31 is cut by applying a shearing force by perpendicularly intersecting the wire 31 gripped in the vertical direction. Even after cutting, the wire 31a on the side gripped by the chuck 33 is not bent, and its tip is held on the center axis of the positioned chuck 33, and the cut surface is a plane perpendicular to the center axis of the wire 31a. It can be. As a result, in wire bonding, since the cut surface is flat, the welding conditions are stable and a good welding state is obtained, and the cut surface is held on the center axis of the chuck 33 positioned, so that the end of the wire 31a Positioning of the part (cut surface) to a desired joining position becomes easy.
[Brief description of the drawings]
FIG. 1 is a top view of a wire cutting device according to an embodiment of the present invention.
2 is a top view showing the operation of the wire cutting device of FIG. 1 in a series of wire cutting steps, FIG. 2 (a), FIG. 2 (b), and FIG. 2 (c), respectively. A start stage, a positioning stage, and a cutting stage are shown.
3 is a view when the wire cutting process by the wire cutting device of FIG. 1 is viewed from the mounting pin side of both cutting members; FIG. 3 (a), FIG. 3 (b) and FIG. 3 (c) correspond to a start stage, a positioning stage, and a cutting stage, respectively.
4A and 4B are diagrams showing a state of wire cutting by a conventional wire cutting device, in which FIG. 4A shows cutting by a pliers-type cutting device, and FIG. 4B shows cutting by a scissors-type cutting device. .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Wire cutting device 3 ... Base part 5 ... 1st cutting member 6 ... Mounting projection part 7 ... Second cutting member 8 ... Mounting projection part 9 ... Cutting blade part 11 ... Cutting blade part 13 ... Mounting pin 15 ... Driving means 16 ... stopping means mounting wall 17 ... stopping means 18 ... load means mounting wall 19 ... load means 20 ... drive part 21 ... power transmission part 23 ... first member 25 ... second member 27 ... third member 29 ... stop member 31 ... wire 33 ... Chuck

Claims

A base member, a first cutting member and a second cutting member that are rotatably attached to the base member, and a driving means for rotating the first cutting member and the second cutting member. In the wire cutting device for cutting the gripped wire,
The first cutting member is attached so as to be positioned closer to the gripping means than the second cutting member when the wire is cut, and the first cutting member and the second cutting member have a cutting edge portion at one end thereof. And connected to the driving means at the other end,
The drive means is a drive unit that linearly reciprocates the drive part, the drive part that is rotatably attached to the base member at a part opposite to the drive part, a first member, a second member, A power transmission unit composed of three members, wherein each member is rotatably attached to one end of the other two members at one end thereof, and the other end of the first member is attached to a drive portion of the drive unit. The other end of the second member is rotatably attached to the other end of the first cutting member, and the other end of the third member is rotatably attached to the other end of the second cutting member; Have
Stop means for stopping the rotational movement of the first cutting member toward the wire at a position in contact with the wire, and load means for applying a load to the rotational movement of the second cutting member toward the wire, the second cutting member Load means provided between a portion attached to the base member and the other end of the second cutting member, and after the first cutting member is stopped by the stopping means, A wire cutting device, wherein the wire is cut by a rotational movement of the second cutting member toward the wire.

The wire cutting device according to claim 1, wherein the load means is formed of an elastic member.