JPS62234944A - Wire dot head - Google Patents
Wire dot headInfo
- Publication number
- JPS62234944A JPS62234944A JP7873186A JP7873186A JPS62234944A JP S62234944 A JPS62234944 A JP S62234944A JP 7873186 A JP7873186 A JP 7873186A JP 7873186 A JP7873186 A JP 7873186A JP S62234944 A JPS62234944 A JP S62234944A
- Authority
- JP
- Japan
- Prior art keywords
- coil
- core
- yoke
- wire
- coil core
- 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.)
- Granted
Links
- 230000004907 flux Effects 0.000 description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 14
- 125000006850 spacer group Chemical group 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229920006395 saturated elastomer Polymers 0.000 description 5
- 230000017525 heat dissipation Effects 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000002241 glass-ceramic Substances 0.000 description 1
- 238000005495 investment casting Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000013464 silicone adhesive Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
- B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
- B41J2/27—Actuators for print wires
- B41J2/275—Actuators for print wires of clapper type
Landscapes
- Impact Printers (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、コイルコアを励磁することにより可動コアを
吸引し、揺動レバーを作動させてワイヤを突出させる様
にしたワイヤドツトヘッドに関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a wire dot head that attracts a movable core by exciting a coil core and operates a swing lever to project a wire.
（従来技術）
近年、ワイヤドツトプリンタは、増々印字の高速化、小
型化が要求されつつある。第９図は従来のクラッパ−型
ワイヤドツトヘッドの要部断面を示している。図におい
て、ヨークＹに一体に突出形成されたコイルコアＣＣに
はコイルＣが回される。(Prior Art) In recent years, wire dot printers are required to be faster and smaller in printing speed. FIG. 9 shows a cross section of a main part of a conventional clapper type wire dot head. In the figure, a coil C is wound around a coil core CC formed integrally with a yoke Y so as to protrude.
このコイルにより発生された磁束Φが、アマチュアレバ
ーＬに固定された可動コアＭＣを通り、補助ヨークＳＹ
を通過して再びコイルコアＣＣに続き、磁気回路を形成
する。コイルが励磁されると、可動コアＭＣが吸引され
アマチュアレバーＬに固定されたワイヤＷが突出される
。ここでコイルＣはコアＣＣの端面よりもｌだけ下がっ
ている。従ってコアＣＣに磁束が発生すると可動コアＭ
Ｃをも磁束が貫通するが、可動コアＭＣは可動部である
ためコイルコアＣＣの断面積よりも可動コアＭＣのコア
ＣＣへの対向面積は小さくなっている。従ってコイルコ
アＣＣで磁束が飽和する以前に可動コアＭＣが飽和する
。一度飽和すると起磁力を増加させても可動コアＭＣは
空気とほぼ同様の透磁率になるため可動コアＭＣへの磁
束Φはそれ程増加せず、コアＣＣからの磁束は補助ヨー
クＳＹのコイルコアＣＣ−用の穴近傍に磁束Φ２が集中
するようになり、起磁力が増加しても可動コアＭＹへの
磁束は余り増加せず吸引力も余り増大しない。即ちコイ
ル内で発生する磁束をΦとするとΦ物Φｌ＋Φ２（１）
となりΦｌくΦとなる。従って必要な吸引力を出すため
に極度の飽和状態にすることが考えられるが磁気効率は
極度に低下し、発熱が著しく増加し、ワイヤドツトヘッ
ドの破壊も起りかねない。そこで第１Ｏ図のようにコイ
ルコアＣＣの先端をヨークＹの円筒壁ｃｙの端面よりｌ
′だけ低（すると、磁気効率は著しく向上する。即ちコ
イルと補助ヨークＳＹの端面との距離をＧとし、可動コ
アＭＣの端面とコイルの上端との距離を１１、コイルコ
アＣＣの端面とコイル上端との距離を１２とした場合、
１１゜１２を極力大きくし、Ｇを極力小さくすると磁気
効率が向上する。本例ではＧ＝０．２ｍｍである。この
ような機構においては、コイルで発生する起磁力により
磁束はたとえ可動コアＭＣで飽和しても常にコイルの上
端と同一面まで可動コアＭＣ内において発生するため、
そこから補助ヨークＳＹの可動コアＭＣ用の穴の近傍へ
磁束Φ４が集中する。即ちΦ＝Φ３＝Φ４ （
２）
ここで可動コアＭＣのコアＣＣとの対向面積をＳとする
と、吸引力Ｆは次のようになる。The magnetic flux Φ generated by this coil passes through the movable core MC fixed to the armature lever L, and passes through the auxiliary yoke SY.
and continues to the coil core CC again to form a magnetic circuit. When the coil is excited, the movable core MC is attracted and the wire W fixed to the armature lever L is projected. Here, the coil C is lowered by l than the end face of the core CC. Therefore, when magnetic flux is generated in core CC, movable core M
Although the magnetic flux also passes through C, since the movable core MC is a movable part, the area of the movable core MC facing the core CC is smaller than the cross-sectional area of the coil core CC. Therefore, movable core MC is saturated before the magnetic flux is saturated in coil core CC. Once saturated, even if the magnetomotive force is increased, the magnetic flux Φ to the movable core MC will not increase that much because the movable core MC has almost the same magnetic permeability as air, and the magnetic flux from the core CC is transferred to the coil core CC- of the auxiliary yoke SY. The magnetic flux Φ2 comes to concentrate near the hole, and even if the magnetomotive force increases, the magnetic flux to the movable core MY does not increase much and the attractive force does not increase much either. That is, if the magnetic flux generated within the coil is Φ, then Φ object Φl + Φ2 (1)
Then, Φl becomes Φ. Therefore, it is conceivable to create an extremely saturated state in order to generate the necessary attraction force, but the magnetic efficiency will be extremely reduced, heat generation will increase significantly, and the wire dot head may be destroyed. Therefore, as shown in Fig. 1O, the tip of the coil core CC is l.
' (Then, the magnetic efficiency improves significantly. In other words, the distance between the coil and the end face of the auxiliary yoke SY is G, the distance between the end face of the movable core MC and the top end of the coil is 11, and the distance between the end face of the coil core CC and the top end of the coil is If the distance from
If 11°12 is made as large as possible and G is made as small as possible, magnetic efficiency will be improved. In this example, G=0.2 mm. In such a mechanism, even if the magnetic flux is saturated in the movable core MC due to the magnetomotive force generated in the coil, it is always generated within the movable core MC up to the same plane as the upper end of the coil.
From there, the magnetic flux Φ4 is concentrated near the hole for the movable core MC of the auxiliary yoke SY. That is, Φ=Φ3=Φ4 (
2) Here, if the area of the movable core MC facing the core CC is S, the suction force F is as follows.
またこの磁気回路の可動コアＭＣ部でのパーミアンスを
Ｐｉミコイル起磁力をＵとすると、Φ＝ＰＵ
（４）
従って可動コアＭＣでΦ！＝Φ３とするためには、パー
ミアンスは磁気抵抗の逆数であるため従来タイプの方が
磁気抵抗が大きいのでパーミアンスＰは小さくなりそれ
だけ起磁力を大きくしなければならないことになる。第
１１図は従来のタイプ（ａ）と改善されたタイプ（ｂ）
とでのワイヤ２の先端の挙動をフリーの状態で、同一の
起磁力を与えた時の光学変位測定機で観察した時の変位
波形である。Also, if the permeance at the movable core MC portion of this magnetic circuit is Pi, and the magnetomotive force of the coil is U, then Φ=PU
(4) Therefore, Φ! with movable core MC! In order to set =Φ3, since permeance is the reciprocal of magnetic resistance, the conventional type has a larger magnetic resistance, so the permeance P becomes smaller, and the magnetomotive force must be increased accordingly. Figure 11 shows the conventional type (a) and the improved type (b).
This is a displacement waveform when observing the behavior of the tip of the wire 2 in a free state with an optical displacement measuring device when the same magnetomotive force is applied.
図からも明らかなように改善されたタイプ（ｂ）の方が
従来タイプ（ａ）よりもワイヤＷの動作速度が大きいた
め運動エネルギーも大きく印字も大きくなる。このため
高印字品位になり、また動作速度も大きいので高速化し
易い。また磁気効率も高いので発熱が小さくでき、起磁
力も小さくできるのでコイルの大きさも小さくできるの
でワイヤドツトヘッドの小型化も可能である。As is clear from the figure, the improved type (b) has a higher operating speed of the wire W than the conventional type (a), so the kinetic energy is larger and the print size is larger. Therefore, the printing quality is high, and the operation speed is high, so it is easy to increase the speed. Furthermore, since the magnetic efficiency is high, heat generation can be reduced, and the magnetomotive force can also be reduced, so the size of the coil can also be reduced, making it possible to downsize the wire dot head.
（発明が解決しようとする問題点）
以上の様な改善されたワイヤドツトヘッドは確かに磁気
効率の面で好ましいが、実際に製造する上で極めてむず
かしい。というのも、ヨークＹの円筒壁ＣＹの高さと、
コイルコアＣＣの先端高さに差β′をつけなければなら
ず、しかもこの差は可動コアＭＣとコイルコアＣＣ間の
ギャップを決定する為、特に精度良（設定されなければ
ならないからであり、この点は実質上量産の可能なワイ
ヤドツトヘッドを提供することを不能としていた。(Problems to be Solved by the Invention) Although the improved wire dot head as described above is certainly desirable in terms of magnetic efficiency, it is extremely difficult to actually manufacture it. This is because the height of the cylindrical wall CY of the yoke Y,
A difference β' must be added to the tip height of the coil core CC, and this difference determines the gap between the movable core MC and the coil core CC, so it must be set with particularly high precision. It was virtually impossible to provide a wire dot head that could be mass-produced.
（問題点を解決するための手段）
コイルを嵌入するためのコイルコアを円環状に複数配列
し、コイルコアの先端面と同一高さに突出した略円筒状
の壁面を備えた略カップ状の第１のヨーク部材に対して
、その先端面がコイルコアの先端よりも突出するコイル
を該コイルコアに嵌入する。(Means for Solving the Problems) A plurality of coil cores into which coils are inserted are arranged in an annular shape, and a first cup-shaped first body is provided with a substantially cylindrical wall surface protruding at the same height as the tip end surface of the coil cores. A coil whose distal end surface protrudes beyond the distal end of the coil core is fitted into the yoke member.
（作用）
以上の構成により、第１のヨーク部材はコイルコアの先
端面と円筒壁の先端が同一高さにでき、しかもコイルは
コイルコアの先端よりも更に突出する。(Function) With the above configuration, in the first yoke member, the distal end surface of the coil core and the distal end of the cylindrical wall are at the same height, and the coil further protrudes beyond the distal end of the coil core.
（実施例）
以下、本発明のワイヤドツトヘッドの実施例につき基本
構成とその動作の概要を添付された図面をもとに説明す
る。(Example) The basic structure and operation of an example of the wire dot head of the present invention will be explained below with reference to the attached drawings.
第１図はワイヤドツトヘッドの正面図、第２図はその側
面図、第３図はその背面図、第４図はその平面図であり
、第５図は第１図におけるＡ−Ａ断面図であり、第６図
、第７図は、第３図の方向において組立類に各背面をあ
られした図であり、第８図は分解斜視図である。第１図
において１は前カバーで、アルミダイキャストから成り
、放熱フィン２を有し、本体にビス止めするためのＵ溝
１ａを有する。前カバー１はビス３によってヨーク４に
固定されている。Fig. 1 is a front view of the wire dot head, Fig. 2 is a side view thereof, Fig. 3 is a rear view thereof, Fig. 4 is a plan view thereof, and Fig. 5 is a sectional view taken along line A-A in Fig. 1. FIG. 6 and FIG. 7 are views showing the back side of the assembly in the direction of FIG. 3, and FIG. 8 is an exploded perspective view. In FIG. 1, reference numeral 1 denotes a front cover, which is made of die-cast aluminum, has radiation fins 2, and has a U-groove 1a for fixing to the main body with screws. The front cover 1 is fixed to the yoke 4 with screws 3.
、このヨーク４の背面側には、やはりアルミニュウム等
の放熱性の高い材質により形成された後カバー５がビス
６にて固定されている。この後カバー５には第３図に示
す如くやはり放熱フィン７が設けられている。A rear cover 5, also made of a material with high heat dissipation such as aluminum, is fixed to the back side of the yoke 4 with screws 6. After this, the cover 5 is also provided with heat radiation fins 7 as shown in FIG.
第５図に示す如く、前カバー１には、ワイヤ１０を支持
するガイド類を設置、するための凹部１ｂ、溝部１ｃ、
Ｉｄが設けられ、凹部ｉｂには先端ガイド１１゜溝部１
ｃ、ｌｄには中間ガイド１２．１３が嵌入固定されてい
る。先端ガイド１１は印字品位を左右する重要な部材で
、耐摩耗性に優れたものでなければならず、本印字ヘッ
ドではガラスセラミックを用い、表面に１〜２μの窒化
チタンコーティングを施している。本印字ヘッドは１８
ピン印字ヘッドであるため、この先端ガイド１１には９
個づつ２列の千鳥配列した穴が設けられ、ワイヤ径が０
、２５ ｍ ｍであるため、ガイド穴径は０ 、２７
ｍ ｍとなっている。また中間ガイド１２．１３もワ
イヤｌＯの挙動を安定させるために重要な部材で、本印
字ヘッドではモールドから成る。４は略カップ状をなす
ヨークで、磁気回路上重要な部材であるため、磁気特性
に優れた３％ケイ素鋼から成り、１８個のコイルコア１
４を円筒壁４ａ内に環状に配した状態で精密鋳造により
一体となっており、ヨーク４の外周円筒壁４ａとコア１
４の端面とは同一面である。又ヨーク４の円筒壁４ａは
放熱フィンを兼ねた形状になっておりコア１４の周囲の
絶縁耐圧向上と、放熱性向上のためヨーク４の表面は黒
の電着塗装が施されており、前カバー１と接触する面、
後述するスペーサ１５と接触する面及びコア１４の端面
は電着塗装後研摩され、その後ニッケルメッキが施され
ており、印字ヘッド全体の導通をはかっている。コア１
４には銅線１６が捲かれたボビン１７が挿入され、ボビ
ン１７には端子１８が２個圧入されこの２個の端子は板
状になっており、銅線１６の捲き始め捲き終りが半田付
されている。尚ボビン１７は耐熱性に優れた１０％ガラ
スファイバ入ＰＢＴから成る。この端子１８はフレキシ
ブルケーブル１９に半田付されており、フレキシブルケ
ーブル１９から銅線１６へ電流を供給する役目を有する
。ヨーク４の上には純鉄から成るスペーサ１５が設置さ
れ、その上に円板状の補助ヨーク２０が設置されている
。As shown in FIG. 5, the front cover 1 includes a recess 1b, a groove 1c, and a groove 1c for installing guides for supporting the wire 10.
A tip guide 11° and a groove 1 are provided in the recess ib.
Intermediate guides 12.13 are fitted and fixed in c and ld. The tip guide 11 is an important member that affects printing quality and must have excellent wear resistance. In this print head, glass ceramic is used, and the surface is coated with a titanium nitride coating of 1 to 2 microns. This print head is 18
Since it is a pin print head, this tip guide 11 has 9
Two rows of staggered holes are provided, and the wire diameter is 0.
, 25 mm, so the guide hole diameter is 0, 27
It is mm. The intermediate guides 12 and 13 are also important members for stabilizing the behavior of the wire IO, and in this print head are made of a mold. 4 is a cup-shaped yoke, which is an important component in the magnetic circuit, and is made of 3% silicon steel with excellent magnetic properties, and has 18 coil cores 1.
4 are arranged annularly within the cylindrical wall 4a and are integrally formed by precision casting, and the outer cylindrical wall 4a of the yoke 4 and the core 1
The end face of No. 4 is the same surface. Furthermore, the cylindrical wall 4a of the yoke 4 has a shape that also serves as a heat dissipation fin, and the surface of the yoke 4 is coated with black electrodeposition to improve the dielectric strength around the core 14 and heat dissipation. The surface that comes into contact with cover 1,
The surface in contact with a spacer 15, which will be described later, and the end surface of the core 14 are electrodeposited and polished, and then nickel plated to ensure electrical continuity throughout the print head. core 1
A bobbin 17 on which a copper wire 16 is wound is inserted into the bobbin 17, and two terminals 18 are press-fitted into the bobbin 17, and these two terminals are plate-shaped, and the beginning and end of the winding of the copper wire 16 are soldered. It is attached. The bobbin 17 is made of PBT containing 10% glass fiber, which has excellent heat resistance. This terminal 18 is soldered to a flexible cable 19 and has the role of supplying current from the flexible cable 19 to the copper wire 16. A spacer 15 made of pure iron is placed on top of the yoke 4, and a disk-shaped auxiliary yoke 20 is placed on top of the spacer 15.
補助ヨーク２０にはポスト２１が１８本圧入されており
、またモールドであるサブボディ２４がアウトサート成
形により一体に形成されている。このサブボディ２４は
、穴２４ａでアマチュア戻しバネ２２の保持を行ない、
また後述するアマチュアレバー（揺動レバー）２３のガ
イドも行ない、更にアマチュアレバー２３にろう付けさ
れたワイヤ１０の根元部を長円状のガイド穴２４ｂによ
って支持し、そしてアマチュアレバー２３と内縁部２４
ｃで当接してワイヤの前進位置を規定している。Eighteen posts 21 are press-fitted into the auxiliary yoke 20, and a molded subbody 24 is integrally formed by outsert molding. This subbody 24 holds the armature return spring 22 in the hole 24a,
It also guides an armature lever (swinging lever) 23, which will be described later.Furthermore, the base of the wire 10 brazed to the armature lever 23 is supported by an oval guide hole 24b, and the armature lever 23 and the inner edge 24
Abutting at point c defines the forward position of the wire.
補助ヨーク２０は磁気回路を構成している部材であり、
純鉄から成り、ポスト２１は耐摩耗性に優れた窒化ステ
ンレスから成る。１８個のポスト２１が圧入された補助
ヨークには、１８個のポスト２１と勘合する穴のあいた
リング状のフィルムであるシールドフィルム２５が設置
されており、これは耐摩耗性に優れたポリイミドから成
る。そのシールドフィルム２５の上にはアマチュアレバ
ー２３が設置され、アマチュアレバー２３には可動コア
２６が加締により一体化され、また一端にはワイヤＩＯ
がろう付により固着されており、もう一端にはポスト２
１と勘合する穴がおいている。アマチュアレバー２３は
安定した動作をする様に剛性の高いＳＫ材から成り、ま
た可動コア２６は、磁気回路を構成する重要な部材であ
るため純鉄から成っている。ここで磁気回路はコイルコ
ア１４．ヨーク４．スペーサ１５．補助ヨーク２０．可
動コア２６により閉磁路として構成される。The auxiliary yoke 20 is a member constituting a magnetic circuit,
It is made of pure iron, and the post 21 is made of nitride stainless steel with excellent wear resistance. A shield film 25, which is a ring-shaped film with holes that fit into the 18 posts 21, is installed on the auxiliary yoke into which the 18 posts 21 are press-fitted, and is made of polyimide with excellent wear resistance. Become. An armature lever 23 is installed on the shield film 25, a movable core 26 is integrated with the armature lever 23 by caulking, and a wire IO is connected to one end of the armature lever 23.
is fixed by brazing, and there is a post 2 on the other end.
There is a hole that fits into 1. The armature lever 23 is made of a highly rigid SK material to ensure stable operation, and the movable core 26 is made of pure iron because it is an important member constituting the magnetic circuit. Here, the magnetic circuit is the coil core 14. York 4. Spacer 15. Auxiliary yoke 20. The movable core 26 forms a closed magnetic path.
即ち銅線１６に通電されると起磁力が発生し、閉磁路の
可動部である可動コア２６がコイルコア１４方向に吸引
されるため、ボスト２１との勘合部を支点としてアマチ
ュアレバー２３が回動し、アマチュアレバー２３に固着
されているワイヤ１０が図示されてない紙面方向に動き
ドツトを印刷し印刷後待機状態にアマチュア戻しバネ２
２により復帰する。That is, when the copper wire 16 is energized, a magnetomotive force is generated, and the movable core 26, which is the movable part of the closed magnetic circuit, is attracted in the direction of the coil core 14, so the armature lever 23 rotates about the fitting part with the post 21 as a fulcrum. Then, the wire 10 fixed to the armature lever 23 moves in the direction of the page (not shown) to print dots, and after printing, the armature return spring 2 returns to the standby state.
Return by 2.
復帰する時の停止部が２７のストッパである。このスト
ッパはゴム製でストッパ金具２８に焼き付けにより一体
化されている。印字ヘッド内部温度は０°Ｃから１２０
℃位まで変化するため、ストッパ２７の材質は耐熱性に
優れ、またワイヤ１０の動作の安定性を左右する反発弾
性の小さい弾性体が使用されている。またストッパの反
発弾性の温度依存性を極力抑えるためゴム厚を薄くして
０ 、２ ｍ ｍとしている。一方ストツパ金具２８は
ストッパ２７とアマチュアレバー２３との衝撃時に発生
する衝撃音を抑えるため制振性の高い亜鉛から成ってい
る。ワイヤｌＯの後退方向におけるストロークはストッ
パ２７の位置により決定されるため、ストローク調整ワ
ッシャ２９が補助ヨーク２０のモールド部のサブボディ
２１との間に介在され、０．０２ｍｍ単位で調整可能と
なっている。このストローク調整ワッシャはリン青銅か
ら成る。アマチュアレバー２３の上にはストロークフィ
ルム３０が設置され、その上からアマチュア押えバネ３
１でアマチュアレバー２３は押圧され、ポスト２１を中
心にアマチュアレバー２３は回動する。アマチュア押え
バネ３１はステンレス製で、アマチュアレバー２３と直
接接触するとアマチュアレバー２３が摩耗するため、こ
れを防止する機能をストロークフィルム３０は有する。The stop portion at the time of return is the stopper 27. This stopper is made of rubber and is integrated with the stopper fitting 28 by baking. Print head internal temperature ranges from 0°C to 120°C
℃, the stopper 27 is made of an elastic material that has excellent heat resistance and low rebound resilience, which affects the stability of the operation of the wire 10. Furthermore, in order to suppress the temperature dependence of the stopper's rebound resilience as much as possible, the rubber thickness is made thin to 0.2 mm. On the other hand, the stopper metal fitting 28 is made of zinc, which has high vibration damping properties, in order to suppress the impact noise generated when the stopper 27 and the armature lever 23 collide. Since the stroke of the wire IO in the backward direction is determined by the position of the stopper 27, a stroke adjusting washer 29 is interposed between the sub-body 21 of the molded part of the auxiliary yoke 20 and can be adjusted in 0.02 mm increments. . This stroke adjustment washer is made of phosphor bronze. A stroke film 30 is installed on the amateur lever 23, and the amateur presser spring 3 is installed from above.
1, the armature lever 23 is pressed, and the armature lever 23 rotates about the post 21. The armature presser spring 31 is made of stainless steel, and if it comes into direct contact with the armature lever 23, the armature lever 23 will wear out, so the stroke film 30 has a function to prevent this.
一方アマチュアレバー２３とストッパ２７とは、ストッ
パ２７がゴムであるため粘着し易く、印字不良が発生す
ることがあるので、アマチュアレバー２３とストッパ２
７との間にストロークフィルム３０を介在させて防止し
ている。このようにストロークフィルム３０には、アマ
チュア押えバネ３１によるアマチュアレバー２３の摩耗
防止、及びアマチュアレバー２３とストッパ２７との粘
着による印字不良を防止する２つの機能を有する。On the other hand, since the stopper 27 is made of rubber, it tends to stick to the armature lever 23 and the stopper 27, which may cause printing defects.
A stroke film 30 is interposed between the stroke film 7 and the stroke film 7 to prevent the stroke. In this way, the stroke film 30 has two functions: preventing the armature lever 23 from being worn out by the armature presser spring 31, and preventing printing defects due to adhesion between the armature lever 23 and the stopper 27.
アマチュア押えバネ３１はストッパ金具２８とダンパ３
２との間に介在され、ダンパ３２を介してビス３３によ
りサブボディ２４に固定されている。このダンパ３２は
アマチュアレバー２３がストッパ２７との衝撃時に発す
る衝撃音を抑えるため制振性の高い亜鉛から成っている
。更にダンパ３２の上にはステンレス製のダンパ押えバ
ネ３４が設置され、ダンパ３２を適度な押圧力で押圧し
ており、本印字ヘッドでの押圧力は約３．６Ｋｇである
。また第３，４図に示す如くこのダンパ押えバネ３３を
アルミ製の後カバー５で押え、補助ヨーク２０．スペー
サ１５を介してヨーク４にビス６の４本により固定して
いる。The amateur presser spring 31 is connected to the stopper fitting 28 and the damper 3.
2, and is fixed to the subbody 24 with a screw 33 via a damper 32. This damper 32 is made of zinc, which has high vibration damping properties, in order to suppress the impact noise generated when the armature lever 23 collides with the stopper 27. Furthermore, a damper presser spring 34 made of stainless steel is installed on top of the damper 32, and presses the damper 32 with an appropriate pressing force, and the pressing force with this print head is about 3.6 kg. Further, as shown in FIGS. 3 and 4, this damper pressing spring 33 is held down by an aluminum rear cover 5, and the auxiliary yoke 20. It is fixed to the yoke 4 with four screws 6 via a spacer 15.
この後カバー５も放熱性を向上させるため黒色塗装が施
されている。尚ヨーク４には平行ピン３５が２本圧入さ
れており、ヨーク４のコア１４とスペーサ１２、補助ヨ
ーク２０及び後カバー５との位置関係を正確に規定して
いる。After this, the cover 5 is also painted black to improve heat dissipation. Two parallel pins 35 are press-fitted into the yoke 4 to accurately define the positional relationship between the core 14 of the yoke 4, the spacer 12, the auxiliary yoke 20, and the rear cover 5.
本印字ヘッドは温度上昇が大きいため、銅線１６を保護
する為、サーミスタ３６をヨーク４の１部に熱伝導率の
高いシリコン接着剤で埋め込んでいる。Since this print head has a large temperature rise, in order to protect the copper wire 16, a thermistor 36 is embedded in a portion of the yoke 4 with a silicone adhesive having high thermal conductivity.
また前カバー１は第１図に示す如（ワイヤ１０とガイド
類の適正な位置を出すために、平行ピン３７で位置決め
し、ビス３の４本でヨーク４に固定している。本印字ヘ
ッドに電流を供給しているフレキシブルケーブル１９は
途中で折り曲げられ、このフレキシブルケーブル１９を
保護するためフレキシブルケーブル押え３８（第２，３
図）で押えられ、このケーブル押え３８はビス３９の２
本でヨーク４に固定されている（第８図）。The front cover 1 is positioned as shown in Fig. 1 (in order to properly position the wire 10 and guides, it is positioned with parallel pins 37 and fixed to the yoke 4 with four screws 3.This print head The flexible cable 19 that supplies current to the
This cable holder 38 is held down by two screws 39.
It is fixed to the yoke 4 with a book (Fig. 8).
また本実施例においては、第６図に明確に示される如（
、コイルコア１４の断面形状、ポビン１７の断面形状、
及び補助ヨーク１３のコイルコア１４に対応した部分に
設けられた穴２０ｃの形状がほぼ二等辺三角形をなして
いる。このような三角形状は、コイルコアを中央に集中
的に実装し小型化を図る上で有理であるが、本例におい
ては更にコイルコア１４、銅線１６によって生み出され
る磁界を効率的に使用し、しかもワイヤを無理なく円滑
に案内して摩耗を防止するため、コイルコア等の向きと
、ワイヤのガイド穴等の向きを工夫している。即ち、図
に示された如く、略二等辺三角形のコイルコア１４の頂
角における二等分線４０に、コイルボビン１７、補助ヨ
ーク２０の穴２０ｃの二等分線がそれぞれ一致し、それ
らの二等分線の延長線上に長手状となる様−サブボディ
２４のガイド穴２４ｂが配置され、更に中間ガイド１３
の長手状ガイド穴１３ａも、二等分線の延長線上に長手
状となる様、また２列の円弧列となる様設定されている
。Furthermore, in this embodiment, as clearly shown in FIG.
, the cross-sectional shape of the coil core 14, the cross-sectional shape of the pobbin 17,
The shape of the hole 20c provided in the portion of the auxiliary yoke 13 corresponding to the coil core 14 is approximately an isosceles triangle. Such a triangular shape is reasonable in terms of compactness by mounting the coil core centrally, but in this example, the magnetic field generated by the coil core 14 and the copper wire 16 can be used efficiently. In order to guide the wire effortlessly and smoothly and prevent wear, the orientation of the coil core and the wire guide holes are carefully chosen. That is, as shown in the figure, the bisector 40 of the apex angle of the approximately isosceles triangular coil core 14 coincides with the bisector 40 of the hole 20c of the coil bobbin 17 and the auxiliary yoke 20. The guide hole 24b of the sub-body 24 is arranged in a longitudinal manner on the extension line of the segment line, and the intermediate guide 13
The longitudinal guide holes 13a are also set to be longitudinal on an extension of the bisector, and to form two arcuate rows.
尚、中間ガイド１２のガイド穴１２ａはほぼ真円状をな
し、先端ガイド１１とほぼ同じ２本の直線列状、に案内
されている。Note that the guide holes 12a of the intermediate guide 12 have a substantially perfect circular shape, and are guided in substantially the same two straight lines as the tip guide 11.
以上の様なワイヤ１０の案内構成によって、各ワイヤは
、各コイルコアの頂角のほぼ二等分線上に案内され、ワ
イヤの摺動抵抗は最小となる。またこの二等分線上にア
マチュアレバー２３の中心線が合致しているので、コイ
ルコア１４から出た磁束は最も効率的にアマチュアレバ
ー２３を通ることになり、銅線１７の発生した磁界を効
率良く使用できる。With the wire 10 guiding structure as described above, each wire is guided approximately on the bisector of the apex angle of each coil core, and the sliding resistance of the wire is minimized. In addition, since the center line of the armature lever 23 coincides with this bisector, the magnetic flux emitted from the coil core 14 passes through the armature lever 23 most efficiently, and the magnetic field generated by the copper wire 17 is efficiently absorbed. Can be used.
次にワイヤ１０による印字原理を詳細に述べる。Next, the principle of printing using the wire 10 will be described in detail.
ヨーク４の１部であるコイルコア１４にボビン１７に銅
線１６が巻装されたボビン組立体が挿入され、ヨーク４
の端面にスペーサ１５が設置され、その上に補助ヨーク
２０が設置され、その補助ヨーク２゜には可動コア２６
用の穴２０ｃが設けられ、また１部にはポスト２１が圧
入されている。一方アマチュアレバー２３の先端にはワ
イヤ１０がろう付により固着され、またアマチュアレバ
ー２３のほぼ中央部には可動コア２６がカシメにより一
体化され、アマチュアレバー２３の他端にはポスト２１
用の穴が設けられ、アマチュアレバー２３はポスト２１
によりポスト２１を支点として回動する。銅線１６に通
電されると起磁力が発生し、それによる磁束がコア１４
゜ヨーク４．スペーサ１５．補助ヨーク２０及び可動コ
ア２６を通り、閉磁路を構成する。この時コイルコア１
４と可動コア２６間に吸引力が発生し、可動コア２６が
コア１４の方へ吸引され、その結果ワイヤ１０が動作し
印字を行なうことになる。A bobbin assembly in which copper wire 16 is wound around a bobbin 17 is inserted into the coil core 14 which is a part of the yoke 4, and the yoke 4
A spacer 15 is installed on the end face of the spacer, an auxiliary yoke 20 is installed on top of the spacer 15, and a movable core 26 is installed on the auxiliary yoke 2°.
A hole 20c is provided for the purpose, and a post 21 is press-fitted into one part. On the other hand, a wire 10 is fixed to the tip of the armature lever 23 by brazing, a movable core 26 is integrated with the armature lever 23 by caulking approximately in the center thereof, and a post 21 is attached to the other end of the armature lever 23.
A hole is provided for the amateur lever 23 to be attached to the post 21.
The post 21 is rotated by using the post 21 as a fulcrum. When the copper wire 16 is energized, a magnetomotive force is generated, and the resulting magnetic flux is directed to the core 14.
゜Yoke 4. Spacer 15. It passes through the auxiliary yoke 20 and the movable core 26 to form a closed magnetic path. At this time, coil core 1
4 and the movable core 26, the movable core 26 is attracted toward the core 14, and as a result, the wire 10 operates to perform printing.
第１２図はヨーク４付近の詳細を示している。本実施例
においては、ヨーク４と補助ヨーク２０の間にスペーサ
１５を介在させ、かつ銅線１６の端面がコイルコア１４
の端面よりも１２だけ突出する様銅線１６の寸法を設定
した。これによって第１１図の（ｂ）に示す如き特性を
得た。本実施例においては、ヨーク４においてコイルコ
ア１４の端面と、円筒壁４ａの端面が同一高さに設定さ
れており、ヨーク４を寸法精度良く極めて容易に製造で
きる。また補助ヨーク２０は円盤状に形成されており、
こちらも寸法精度の高いものを容易に製造でき、全体と
して本実施例は、可動コア２６とコイルコア１４との間
のギャップを極めて精度高（、しかも安価なコストで設
定することができる。FIG. 12 shows details of the vicinity of the yoke 4. In this embodiment, a spacer 15 is interposed between the yoke 4 and the auxiliary yoke 20, and the end face of the copper wire 16 is connected to the coil core 14.
The dimensions of the copper wire 16 were set so that it protruded by 12 mm from the end face of the copper wire 16. As a result, characteristics as shown in FIG. 11(b) were obtained. In this embodiment, the end face of the coil core 14 and the end face of the cylindrical wall 4a in the yoke 4 are set at the same height, making it possible to manufacture the yoke 4 with high dimensional accuracy very easily. Further, the auxiliary yoke 20 is formed in a disk shape,
This can also be easily manufactured with high dimensional accuracy, and as a whole, in this embodiment, the gap between the movable core 26 and the coil core 14 can be set with extremely high precision (and at low cost).
第１３図は、コイルコア１４の端面と銅線１７の端面間
の距離！！２を変化させた時のワイヤ先端の挙動を示し
たもので、！！２が大きくなるに従ってワイヤが高速に
立上げられることがわかる。FIG. 13 shows the distance between the end face of the coil core 14 and the end face of the copper wire 17! ! This shows the behavior of the wire tip when changing 2! ! It can be seen that as 2 increases, the wire rises faster.
第１４．１５図は本発明の他の実施例を示すもので、第
１４図に示す如くボビン４２には、自己融着導線でなる
コイル４３を支持する部位４２ａ１コイル４３の一端を
固定し保護するフランジ４２ｂ１及び端子４４を嵌合さ
せるための筒状部４２ｃが形成されている。Figures 14 and 15 show another embodiment of the present invention.As shown in Figure 14, a part 42a1 that supports a coil 43 made of self-welding conductive wire is fixed to the bobbin 42 to protect it. A flange 42b1 and a cylindrical portion 42c into which the terminal 44 is fitted are formed.
コイル４３を支持する部位４２ａはコイル４３の長さよ
り短くなっているので、第１５図に示すようにその分だ
け可動コア２６のコイルコア１４に対向する面積を大き
くできるため磁気抵抗が小さくなり、磁束の漏れが少な
くなり、エネルギー効率が向上する。Since the portion 42a supporting the coil 43 is shorter than the length of the coil 43, the area of the movable core 26 facing the coil core 14 can be increased by that much as shown in FIG. 15, so the magnetic resistance is reduced and the magnetic flux is Reduces leakage and improves energy efficiency.
また、可動コア２６に対向する側には、フランジが無い
ので、第１５図に示すように、その分だけコイル４３の
高さを高くでき、可動コア２６をコイルの中へ入り込ま
せる量が増える。コイル４３で発生する磁界により磁束
は、常にコイル４３の上端と同一面まで可動コア２６内
において発生するため、コイル４３の上端を高くした分
だけ、磁気抵抗が小さくなり、エネルギー効率が向上す
る。Furthermore, since there is no flange on the side facing the movable core 26, the height of the coil 43 can be increased accordingly, as shown in FIG. 15, and the amount of the movable core 26 that can be inserted into the coil increases. . Because magnetic flux is always generated within the movable core 26 by the magnetic field generated by the coil 43 up to the same level as the upper end of the coil 43, the magnetic resistance is reduced by the amount that the upper end of the coil 43 is raised, and energy efficiency is improved.
（効果）
本発明は以上の様に、コイルを嵌入するためのコイルコ
アを円環状に複数配列し、コイルコアの先端面と同一高
さに突出した略円筒状の壁面を備えた略カップ状の第１
のヨーク部材に対して、その先端面がコイルコアの先端
よりも突出するコイルを、このコイルコアに嵌入するよ
うにしたので、第１のヨーク部材はコイルコアの先端面
と円筒壁の先端が同一高さにでき、しかもコイルはコイ
ルコアの先端よりも更に突出して、ワイヤの駆動効率は
向上する。(Effects) As described above, the present invention arranges a plurality of coil cores into which coils are inserted in an annular shape, and forms a substantially cup-shaped tube having a substantially cylindrical wall surface protruding at the same height as the tip end surface of the coil core. 1
For the first yoke member, a coil whose distal end surface protrudes beyond the distal end of the coil core is fitted into the coil core, so that the distal end surface of the coil core and the distal end of the cylindrical wall of the first yoke member are at the same height. Moreover, since the coil protrudes further than the tip of the coil core, the wire driving efficiency is improved.
第１図は本発明の実施例であるワイヤドツトの正面図、
第２図はヘッドの側面図、第３図はヘッドの背面図、第
４図はヘッドの平面図、第５図は第１図におけるＡ−Ａ
断面図、第６図、第７図はヘッドの背面を組立順に示し
た説明図、第８図はヘッド全体の分解斜視図、第９図、
第１Ｏ図は従来例の断面図、第１１図はワイヤの作動特
性を示す説明図、第１２図は本発明の実施例のヨーク付
近の断面図、第１３図はコイルに対する可動コアの食込
量によるワイヤの作動特性を示す説明図、第１４図は他
の実施例に用いるボビン組立体の分解斜視図、第１５図
は第１４図ボビン組立体を用いた例のヨーク付近の断面
図、
ｌ・・・前カバー、４・・・ヨーク、５・・・後カバー
、ｌＯ・・・ワイヤ、１１・・・先端ガイド、１２．１
３・・・中間ガイド、１４・・・コ′イルコア、１５・
・・スペーサ、１６・・・銅線、１７・・・ボビン、２
０・・・補助ヨーク、２１・・・ポスト、２２・・・戻
しバネ、２３・・・アマチュアレバー、２６・・・可動
コア、２７・・・ストッパ、３１・・・アマチュア押さ
えバネ、３２・・・ダンパFIG. 1 is a front view of a wire dot according to an embodiment of the present invention;
Figure 2 is a side view of the head, Figure 3 is a rear view of the head, Figure 4 is a plan view of the head, and Figure 5 is A-A in Figure 1.
A sectional view, FIGS. 6 and 7 are explanatory diagrams showing the back of the head in the order of assembly, FIG. 8 is an exploded perspective view of the entire head, and FIG.
Fig. 1O is a sectional view of the conventional example, Fig. 11 is an explanatory diagram showing the operating characteristics of the wire, Fig. 12 is a sectional view of the vicinity of the yoke of the embodiment of the present invention, and Fig. 13 is the bite of the movable core into the coil. FIG. 14 is an exploded perspective view of a bobbin assembly used in another embodiment; FIG. 15 is a sectional view of the vicinity of the yoke in an example using the bobbin assembly shown in FIG. 14; l...Front cover, 4...Yoke, 5...Rear cover, lO...Wire, 11...Tip guide, 12.1
3... Intermediate guide, 14... Coil core, 15.
...Spacer, 16...Copper wire, 17...Bobbin, 2
0... Auxiliary yoke, 21... Post, 22... Return spring, 23... Amateur lever, 26... Movable core, 27... Stopper, 31... Amateur holding spring, 32... ··damper
Claims (3)
数配列し、前記コイルコアの先端面と同一の高さに突出
した略円筒状を備えた略カップ状の第１のヨーク部材と
、前記第１のヨーク部材に対し前記コイルコアの端面を
覆う様設けられ該コイルコアに対応した位置に穴を有す
る第２のヨーク部材と、前記第２のヨーク部材に対して
揺動可能に取り付けられ前記穴に嵌入される可動コアを
有した揺動レバー部材と、前記揺動レバー部材の動作に
応じて突出されるワイヤを有し前記コイルはその端面を
前記コイルコアの先端面よりも更に前記第２のヨーク部
材側に突出させたことを特徴とするワイヤドットヘッド
。(1) A substantially cup-shaped first yoke member having a plurality of coil cores arranged in an annular shape into which the coils are inserted and having a substantially cylindrical shape protruding to the same height as the tip surface of the coil cores; a second yoke member that is provided to cover the end face of the coil core and has a hole at a position corresponding to the coil core; and a second yoke member that is swingably attached to the second yoke member and that is provided in the hole. The coil has a swinging lever member having a movable core that is fitted into the swinging lever member, and a wire that is projected in accordance with the operation of the swinging lever member, and the end face of the coil is further connected to the second yoke than the distal end face of the coil core. A wire dot head that is characterized by protruding toward the component side.
ーク部材と前記第１のヨーク部材の間にリング状のスペ
ース部材を挿入し前記コイルコアと前記可動コアの端面
間のギャップを調整する様にしたことを特徴とする特許
請求の範囲第１項記載のワイヤドットヘッド。(2) The second yoke member is approximately disk-shaped, and a ring-shaped space member is inserted between the second yoke member and the first yoke member to form a gap between the end faces of the coil core and the movable core. The wire dot head according to claim 1, characterized in that the wire dot head is adjustable.
記コイルコアに嵌入されるとともに、該コイルボビンは
前記コイルが突出した位置に対応した部分を切欠した形
状を有することを特徴とする特許請求の範囲第１項記載
のワイヤドットヘッド。(3) The coil is fitted into the coil core while being wound around a coil bobbin, and the coil bobbin has a shape in which a portion corresponding to the position where the coil protrudes is cut out. The wire dot head according to item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61078731A JPH0780305B2 (en) | 1986-04-04 | 1986-04-04 | Wired head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61078731A JPH0780305B2 (en) | 1986-04-04 | 1986-04-04 | Wired head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62234944A true JPS62234944A (en) | 1987-10-15 |
| JPH0780305B2 JPH0780305B2 (en) | 1995-08-30 |
Family
ID=13670029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61078731A Expired - Lifetime JPH0780305B2 (en) | 1986-04-04 | 1986-04-04 | Wired head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0780305B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5174663A (en) * | 1988-12-09 | 1992-12-29 | Seiko Epson Corporation | Wire dot print head and method for manufacturing same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5938051U (en) * | 1982-09-02 | 1984-03-10 | 日本電産コパル株式会社 | Print head needle bounce prevention mechanism |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5938051B2 (en) * | 1977-01-07 | 1984-09-13 | 松下電器産業株式会社 | Tube expansion method |
-
1986
- 1986-04-04 JP JP61078731A patent/JPH0780305B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5938051U (en) * | 1982-09-02 | 1984-03-10 | 日本電産コパル株式会社 | Print head needle bounce prevention mechanism |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5174663A (en) * | 1988-12-09 | 1992-12-29 | Seiko Epson Corporation | Wire dot print head and method for manufacturing same |
| US5281037A (en) * | 1988-12-09 | 1994-01-25 | Seiko Epson Corporation | Wire dot print head and method for manufacturing same |
| US5368401A (en) * | 1988-12-09 | 1994-11-29 | Seiko Epson Corporation | Wire dot print head with rotating lever |
| US5527118A (en) * | 1988-12-09 | 1996-06-18 | Seiko Epson Corporation | Wire dot print head and method for manufacturing same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0780305B2 (en) | 1995-08-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |