JPH0220675A - Welding method for wire dot printer head - Google Patents
Welding method for wire dot printer headInfo
- Publication number
- JPH0220675A JPH0220675A JP63169947A JP16994788A JPH0220675A JP H0220675 A JPH0220675 A JP H0220675A JP 63169947 A JP63169947 A JP 63169947A JP 16994788 A JP16994788 A JP 16994788A JP H0220675 A JPH0220675 A JP H0220675A
- Authority
- JP
- Japan
- Prior art keywords
- armature
- welding
- fillet
- printer head
- leaf spring
- 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.)
- Pending
Links
- 238000003466 welding Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims description 12
- 238000007639 printing Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 6
- 239000000956 alloy Substances 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 6
- 230000005291 magnetic effect Effects 0.000 claims description 5
- 230000005294 ferromagnetic effect Effects 0.000 claims 1
- 230000001678 irradiating effect Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 7
- 229910000975 Carbon steel Inorganic materials 0.000 description 3
- 239000010962 carbon steel Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000967 As alloy Inorganic materials 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Landscapes
- Impact Printers (AREA)
- Laser Beam Processing (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、ワイヤドツトプリンタヘッドに組み込まれた
板ばねとアーマチュアとの間の溶接方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of welding between a leaf spring and an armature incorporated in a wire dot printer head.
まず第4図、第5図により本発明の実施対象となるワイ
ヤドツトプリンタヘッドの構造を説明する0図において
、1は漏斗形を成す印字ヘッドのハウジング、2は先端
をハウジング1の頂部開口端に臨ませてガイドフレーム
3にガイドされた超硬合金の細線(直径0.2〜0.3
5 mm程度)としてなる印字ワイヤ、4は各本の印字
ワイヤ2毎に付属するアーマチュア、5はアーマチュア
4を支持した板ばね、6はハウジング1と一体に組立構
成されたアーマチュア駆動用の磁路である。First, in Fig. 0, which explains the structure of a wire dot printer head to which the present invention is applied, with reference to Figs. A thin cemented carbide wire (diameter 0.2 to 0.3
5 is an armature attached to each printing wire 2, 5 is a leaf spring that supports the armature 4, and 6 is a magnetic path for driving the armature assembled integrally with the housing 1. It is.
ここでアーマチュア4は珪素鉄などの強磁性材で作られ
た小ブロック片であり、アーマチュア4の先端に前記し
た細線の印字ワイヤ2がろう付は接合されている。また
板ばね5は合金炭素鋼などのばね材で作られたもので、
その形状は第5図のようにリング状基板5aから内周側
へ向けて放射状に伸びる複数のレバー片5bを形成した
ものであり、各レバー片5b毎にその自由端側に前記の
アーマチュア4を重ね合わせて両者間の合わせ面がスポ
ット溶接されている。一方、閉磁路6は円板状のべ−ス
ヨーク7と、ベースヨーク7の外周に積層したリング状
の永久磁石8.ヨーク9,10と、アーマチュア4の下
面に対向してベースヨーク7に植設した消磁コイル11
を装備のコア12との組立体から成り、かつ前記板ばね
5のリング状基板5aをヨーク9と10との間に挟持し
てボルト13によりハウジング1と一体に締結されてい
る。Here, the armature 4 is a small block piece made of a ferromagnetic material such as silicon iron, and the thin printing wire 2 described above is brazed to the tip of the armature 4. In addition, the leaf spring 5 is made of a spring material such as alloy carbon steel.
Its shape is as shown in FIG. 5, in which a plurality of lever pieces 5b are formed radially extending from a ring-shaped base plate 5a toward the inner circumferential side, and each lever piece 5b has the armature 4 on its free end side. are overlapped and the mating surfaces between the two are spot welded. On the other hand, the closed magnetic path 6 includes a disk-shaped base yoke 7 and a ring-shaped permanent magnet 8 laminated around the outer periphery of the base yoke 7. Yokes 9 and 10 and a degaussing coil 11 installed in the base yoke 7 facing the lower surface of the armature 4
The ring-shaped base plate 5a of the leaf spring 5 is sandwiched between the yokes 9 and 10, and is integrally fastened to the housing 1 by bolts 13.
かかるワイヤドツトプリンタヘッドの動作は周知であり
、消磁コイル11が非励磁の状態では、永久磁石8の起
磁力でアーマチュア4が板ばね5のばね力に抗して図示
のようにコア12に吸着されている。一方、印字信号に
対応して消磁コイル11を励磁すれば、永久磁石8の起
磁力でコア12を通る磁束が打ち消されて磁気的吸引力
が消失し、これによりアーマチュア4は板ばね5のレバ
ー片5bのばね復元力で偏倚駆動され、同時に印字ワイ
ヤ2の先端がハウジング1より突出してドツトマトリッ
クス方式により印字が行われる。The operation of such a wire dot printer head is well known, and when the degaussing coil 11 is de-energized, the armature 4 is attracted to the core 12 by the magnetomotive force of the permanent magnet 8 against the spring force of the leaf spring 5 as shown in the figure. ing. On the other hand, if the degaussing coil 11 is excited in response to the print signal, the magnetic flux passing through the core 12 is canceled by the magnetomotive force of the permanent magnet 8, and the magnetic attraction force disappears. The piece 5b is biased and driven by the spring restoring force, and at the same time, the tip of the printing wire 2 protrudes from the housing 1, and printing is performed by the dot matrix method.
ところで、上記したワイヤドツトプリンタヘッドでは、
印字動作毎に板ばね5のレバー片5bに繰り返し曲げモ
ーメントが加わるようになる。このためにレバー片5a
とアーマチュア4との間のスポット溶接点には切欠き効
果による剪断、圧縮、引張などの応力の他に、印字ワイ
ヤ2と印字対象物との衝突による反力が繰り返し集中的
に加わり、この結果として長期使用の間にスポット溶接
点に疲労き裂、疲労破壊が生じるようになる。By the way, in the wire dot printer head mentioned above,
A bending moment is repeatedly applied to the lever piece 5b of the leaf spring 5 for each printing operation. For this purpose, lever piece 5a
In addition to stresses such as shear, compression, and tension due to the notch effect, reaction forces due to collisions between the printing wire 2 and the object to be printed are repeatedly and intensively applied to the spot welding point between the and the armature 4, and as a result, During long-term use, fatigue cracks and fatigue fractures begin to occur at spot weld points.
本発明は上記の点んにかんがみ成されたものであり、板
ばね、アーマチュアを必要最小限の寸法。The present invention has been made in view of the above points, and it is possible to reduce the size of the leaf spring and armature to the minimum required size.
形状を維持したまま、プリンタヘッドの機能、耐久性の
面で最も重要な板ばねとアーマチュアとの間の溶接接合
部に対して疲労強度が高く、高信頼性の得られる溶接方
法を提供することを目的とする。To provide a welding method that provides high fatigue strength and high reliability for the welded joint between a leaf spring and an armature, which is most important in terms of printer head function and durability, while maintaining the shape. With the goal.
([!を解決するための手段〕
上記課題を解決するために、本発明の溶接方法において
は、アーマチュアと板ばねとの間のすみ部に対し、チー
マチ1ア側の表面にレーザビームを照射して核部にアー
マチュアの溶融金属と板ばね材の化学成分との反応によ
り生成した硬質合金のフィレットを形成するようにした
ものである。(Means for Solving!) In order to solve the above problem, in the welding method of the present invention, a laser beam is irradiated on the surface of the team 1A side of the corner between the armature and the leaf spring. A fillet of hard alloy produced by a reaction between the molten metal of the armature and the chemical components of the leaf spring material is formed at the core.
上記のように板ばねとアーマチュアとの間のすみ部にす
み肉溶接を施して核部にフィレットを成形することによ
り、切欠き効果による応力の集中が緩和され、印字動作
の繰り返しによる溶接接合部の疲労強度低下が防止でき
る。As mentioned above, by performing fillet welding at the corner between the leaf spring and armature and forming a fillet at the core, stress concentration due to the notch effect is alleviated, and the welded joint due to repeated printing operations is reduced. can prevent fatigue strength from decreasing.
しかも、すみ肉溶接に際して、レーザビームを板ばねに
直接照射せず、アーマチュア側の表面に照射することに
より、その照射熱で溶融したアーマチュア側の溶融金属
と板ばね材の化学成分とが反応して新たな合金を生成し
、冷却過程で凝固する際に結晶構造に変態を生じて母材
よりも高硬度なフィレットが形成されることになる。ま
た、この場合に板ばねはレーザ照射による直接的な熱の
影響を受けにくく、したがって板ばねとしての強度、ば
ね特性が損なわれるおそれはないし、さらに通常の溶接
法のように溶接棒を使用しないのでプリンタヘッドの可
動部の重量が増すこともない。Moreover, when fillet welding, by irradiating the laser beam onto the surface of the armature side rather than directly onto the leaf spring, the chemical components of the leaf spring material can react with the molten metal on the armature side melted by the irradiation heat. A new alloy is produced, and when it solidifies during the cooling process, the crystal structure undergoes transformation, forming a fillet that is harder than the base metal. In addition, in this case, the leaf spring is not easily affected by direct heat from laser irradiation, so there is no risk of the strength and spring characteristics of the leaf spring being impaired, and furthermore, welding rods are not used as in normal welding methods. Therefore, the weight of the moving parts of the printer head does not increase.
なお、レーザビームの照射に際しては、YAGレーザを
使用し、その照射電圧を360〜400V、焦点外し量
を4〜4.5 mr*程度に制御することにより良好な
フィレットが形成できる。反面、照射電圧、焦点外し量
の条件が前記範囲を下回るとフィレットの形状がアンダ
ーカットとなり、逆に条件が上回ると溶融金属が飛散し
てピンホールが生じるなどの不具合が発生するおそれが
あるので注意を要する。In addition, when irradiating the laser beam, a good fillet can be formed by using a YAG laser, controlling the irradiation voltage to 360 to 400 V, and controlling the defocus amount to about 4 to 4.5 mr*. On the other hand, if the irradiation voltage and defocus amount conditions are below the above range, the fillet shape will be undercut, and if the conditions are exceeded, problems such as molten metal scattering and pinholes may occur. Caution is required.
第1図は本発明によるアーマチュアと板ばねとの間の溶
接方法の説明図、第2図、第3図はそれぞれフィレット
形状の異なる実施例の構成図を示すものであり、図中、
4が珪素鉄製のアーマチュア、5bが第5図に示した合
金炭素鋼製の板ばね5のレバー片であり、アーマチュア
4は板ばねのレバー片5bの自由端側に重ね合わせて溶
接接合されている。FIG. 1 is an explanatory diagram of a welding method between an armature and a leaf spring according to the present invention, and FIGS. 2 and 3 are diagrams showing configurations of embodiments with different fillet shapes.
4 is an armature made of silicon iron, and 5b is a lever piece of the leaf spring 5 made of alloyed carbon steel shown in FIG. There is.
ここでアーマチュア4と板ばねのレバー片5bとの間を
溶接接合するには、まずアーマチュア4をレバー片5b
の自由端側に重ね合わせた状態で、両者間の対向面の2
箇所符号13で示すようにスポット溶接を施す。次にア
ーマチュア4の端面とレバー片5bの上面との間のすみ
部に対し、YAGレーザ装置14よりレーザビーム15
を照射してすみ肉溶接を行い、核部にフィレット16を
形成する。なお、第2図の実施例ではフィレット16が
アーマチュア4の幅方向に沿ったすみ部の2箇所に、第
3図の実施例ではフィレット16がすみ部の全長域に亙
って連続的に形成されており、かつフィレット16の形
状は0.3mm程度の曲率半径で盛り上がるように形成
されている。Here, in order to weld and join the armature 4 and the lever piece 5b of the leaf spring, first the armature 4 is connected to the lever piece 5b of the leaf spring.
2 of the opposing surfaces between the two
Spot welding is performed as indicated by point number 13. Next, a laser beam 15 is applied from the YAG laser device 14 to the corner between the end surface of the armature 4 and the upper surface of the lever piece 5b.
is irradiated to perform fillet welding, and a fillet 16 is formed at the core. In the embodiment shown in FIG. 2, the fillets 16 are formed at two locations in the corner along the width direction of the armature 4, and in the embodiment shown in FIG. 3, the fillets 16 are formed continuously over the entire length of the corner. In addition, the shape of the fillet 16 is formed to swell with a radius of curvature of about 0.3 mm.
一方、前記したすみ肉溶接を行う際のレーザ照射条件と
して、レーザビーム照射点をアーマチュア4の端蘭上に
定め、かつYAGレーザの照射電圧を360〜400V
、焦点外し量を4〜4.5mmとし\てすみ肉溶接を行
った場合の結果に付いて示すと、珪素鉄製のアーマチュ
ア4のビッカース硬さ100〜150、合金炭素鋼で作
られた板ばね5のビッカース硬さ550〜600に対し
て、フィレット16のピンカース硬さは700〜800
であった。つまり、フィレット16は母材であるアーマ
チュア4.板ばね5よりも硬さの値が高く、疲労強度も
大となることが確認されている。この理由は、レーザビ
ームの照射により母材としてのアーマチュア4から溶融
した溶融金属が板ばね5の化学成分と反応して新たな合
金を作り、これが冷却、凝固する過程で結晶構造に変態
を生じて硬化するものと推定される。On the other hand, as the laser irradiation conditions when performing the fillet welding described above, the laser beam irradiation point is set on the end run of the armature 4, and the irradiation voltage of the YAG laser is set at 360 to 400V.
, the results are shown when fillet welding is performed with a defocus amount of 4 to 4.5 mm. Armature 4 made of silicon iron has a Vickers hardness of 100 to 150, and a leaf spring made of alloyed carbon steel. Fillet 16 has a Vickers hardness of 700 to 800, while Fillet 16 has a Vickers hardness of 550 to 600.
Met. In other words, the fillet 16 is the base material of the armature 4. It has been confirmed that the hardness value is higher than that of leaf spring 5, and the fatigue strength is also higher. The reason for this is that the molten metal melted from the base armature 4 by laser beam irradiation reacts with the chemical components of the leaf spring 5 to create a new alloy, which undergoes a transformation in the crystal structure during the cooling and solidification process. It is presumed that it will harden.
このように、アーマチュア4と板ばね5のレバー片5b
との間のすみ部にレーザビーム照射で高硬度なフィレッ
ト16を形成することにより、切欠き効果による応力集
中が緩和されて疲労強度の高い溶接接合部が得られ、印
字動作が高速で繰り返し行われるプリンタヘッドの耐久
性が高まる。In this way, the armature 4 and the lever piece 5b of the leaf spring 5
By forming a highly hard fillet 16 in the corner between the two by laser beam irradiation, the stress concentration caused by the notch effect is alleviated, resulting in a welded joint with high fatigue strength, and the printing operation can be repeated at high speed. The durability of the printer head increases.
以上説明したように、本発明によるワイヤドツトプリン
タヘッドの溶接方法は、アーマチュアと板ばねとの間の
すみ部に対し、アーマチュア側の表面にレーザビームを
照射して核部にアーマチュアの溶融金属と板ばね材の化
学成分との反応により生成した硬質合金のフィレットを
形成するようにしたので、次記の効果を奏する。As explained above, the wire dot printer head welding method according to the present invention involves irradiating a laser beam onto the surface of the armature side of the corner between the armature and the leaf spring so that the molten metal of the armature and the plate are bonded to the core part. Since the fillet of hard alloy produced by reaction with the chemical components of the spring material is formed, the following effects are achieved.
(1)繰り返し行われる印字動作に対してアーマチュア
と板ばねとの間の溶接接合部への切欠き効果による応力
集中を緩和して疲労強度の高い溶接接合が得られる。(1) A welded joint with high fatigue strength can be obtained by alleviating stress concentration due to the notch effect in the welded joint between the armature and the leaf spring due to repeated printing operations.
(2)板ばねはレーザビームの照射を直接受けないので
、レーザ照射に伴う強度、ばね特性への影響が殆どない
。(2) Since the leaf spring is not directly irradiated with the laser beam, the strength and spring characteristics are hardly affected by the laser irradiation.
(3)レーザ照射によりアーマチュアの一部を溶融して
フィレットを形成したので、プリンタヘッドの可動部の
重量が増加することがなく、印字動作機能に影響を及ぼ
すことがない。(3) Since a portion of the armature is melted by laser irradiation to form a fillet, the weight of the movable part of the printer head does not increase and the printing function is not affected.
など、機能性、耐久性の面で優れたワイヤドツトプリン
タヘッドを得ることができる。A wire dot printer head with excellent functionality and durability can be obtained.
第1図は本発明の溶接方法の説明図、第2図。
第3図はそれぞれフィレット形状の異なる本発明実施例
の要部構成斜視図、第4図はワイヤドツトプリンタヘッ
ド全体の構成断面図、第5図は第4図における板ばね、
アーマチュアの組立平面図である。各図において、
2:印字ワイヤ、4:アーマチュア、5:板ばね、13
ニスポット溶接点、14:レーザ装置、15:レーザビ
ーム、16:フィレット。
分
第3図
第6図FIG. 1 is an explanatory diagram of the welding method of the present invention, and FIG. FIG. 3 is a perspective view of the main parts of embodiments of the present invention having different fillet shapes, FIG. 4 is a sectional view of the entire wire dot printer head, and FIG. 5 is a leaf spring in FIG.
FIG. 3 is an assembled plan view of the armature. In each figure, 2: Print wire, 4: Armature, 5: Leaf spring, 13
Nispot welding point, 14: laser device, 15: laser beam, 16: fillet. Figure 3 Figure 6
Claims (1)
磁性材のアーマチュアに印字ワイヤを取付け、アーマチ
ュアへの吸引磁気力を制御して印字ワイヤを駆動するよ
うにしたワイヤドットプリンタヘッドにおいて、アーマ
チュアと板ばねとの間のすみ部に対し、アーマチュア側
の表面にレーザビームを照射して該部にアーマチュアの
溶融金属と板ばね材の化学成分との反応により生成した
硬質合金のフィレットを形成したことを特徴とするワイ
ヤドットプリンタヘッドの溶接方法。1) In a wire dot printer head in which a printing wire is attached to a ferromagnetic armature that is overlapped and welded to the free end side of a leaf spring, and the printing wire is driven by controlling the magnetic force attracted to the armature. In the corner between the armature and the leaf spring, a laser beam is irradiated onto the surface of the armature to form a fillet of hard alloy produced by the reaction between the molten metal of the armature and the chemical components of the leaf spring material. A method for welding a wire dot printer head, characterized in that a wire dot printer head is formed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63169947A JPH0220675A (en) | 1988-07-07 | 1988-07-07 | Welding method for wire dot printer head |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63169947A JPH0220675A (en) | 1988-07-07 | 1988-07-07 | Welding method for wire dot printer head |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0220675A true JPH0220675A (en) | 1990-01-24 |
Family
ID=15895825
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63169947A Pending JPH0220675A (en) | 1988-07-07 | 1988-07-07 | Welding method for wire dot printer head |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0220675A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008058732A (en) * | 2006-08-31 | 2008-03-13 | Mitsumi Electric Co Ltd | Camera module |
-
1988
- 1988-07-07 JP JP63169947A patent/JPH0220675A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008058732A (en) * | 2006-08-31 | 2008-03-13 | Mitsumi Electric Co Ltd | Camera module |
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