JPS61193866A - Printing hammer - Google Patents

Abstract

PURPOSE:To obtain a highly reliable printing hammer capable of high-speed action, by providing a leaf spring comprising a print needle and a flying member, the first piezoelectric element for exerting a force on the flying member through a surface of a force-transmitting member, and the second piezoelectric element for damping a returning motion of the flying member through a shock- absorbing member. CONSTITUTION:The leaf spring 13 comprising the print needle 11 and the flying member 12 at a free end thereof is fixed to a mount member 14. The first and second piezoelectric elements 15, 16 are connected to the mount member 14 in parallel with each other, on the back side of the flying member 12. The elements 15, 16 are so disposed that they are expanded and contracted toward and away from the flying member 12. The force-transmitting member 17 formed of a hard material such as a metal is provided on a front face of the first piezoelectric element 15, and the flying member 12 is pressed by the spring 13 against the member 17 so that the members 17, 12 make contact with each other. The shock-absorbing member 18 formed of a rubber or a plastic is provided on a front face of the second piezoelectric element 16.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明はインパクト式の印字ハンマ、特に自由飛行（フ
リーフライト）凰の印字ハンマに関する口（従来技術と
その問題点） 自由飛行型の印字ハンマは長ストロークが得られるとい
う利点がある。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an impact type printing hammer, particularly a free flight type printing hammer (prior art and its problems). has the advantage of providing a long stroke.

従来、自由飛行釜の印字ハンマとして電磁石を用いたも
のが広く使用されている０しかし、電磁石を用いたもの
は、電気・機械エネルギ変換効率が低いため、必要とす
る印字エネルギに対し多大な入力エネルギを与える必要
があり、また、電磁石を用いているため大盤化する。Conventionally, devices using electromagnets have been widely used as printing hammers for free-flying pots.However, devices using electromagnets have low electrical/mechanical energy conversion efficiency, so they require a large amount of input compared to the required printing energy. It requires energy and uses electromagnets, so it needs to be large.

そこで近年、電気・機械エネルギ変換効率の高い圧電素
子を駆動源とする印字ハンマが考えられている。たとえ
ば、公開特許公報（昭５９−４５１６５）には、第７図
に示すような印字ハンマが示されている。第７図におい
て、圧電素子７１は、−瑞を取付部材７２に接続し、他
端は力伝達部材７３に接続している。また、印字ワイヤ
７４が接続している係留部７５はコイルばね７６によ）
力伝達部材７３に押圧されている◎印字ワイヤ７４はガ
イド孔７７によル支持されている。Therefore, in recent years, a printing hammer using a piezoelectric element with high electrical/mechanical energy conversion efficiency as a driving source has been considered. For example, a printing hammer as shown in FIG. 7 is disclosed in Japanese Patent Publication No. 59-45165. In FIG. 7, the piezoelectric element 71 has one end connected to a mounting member 72, and the other end connected to a force transmitting member 73. In addition, the mooring portion 75 to which the printing wire 74 is connected is connected to a coil spring 76)
The printing wire 74 pressed by the force transmitting member 73 is supported by the guide hole 77.

印字時、圧電素子７１に電圧を印加すると、圧電素子７
１は、矢印Ａの方向に高速で伸び、力伝達部材７３も変
位する。したがって印字ワイヤ７４と係留部７５は力伝
達部材７３によりカを受けて加速され、圧電素子７１の
伸び量よりもはるかに長い距離を自由飛行し、印字ワイ
ヤ７４の先端でドツトを印字する０ このような圧電素子を用いた自由飛行型の印字ハンマは
構造が簡単で小型化ができる特徴をもっている。しかし
ながら、圧電素子の高速動作により係留部７５に力を作
用させて自由飛行する方法は逆に印字ワイヤ７４及び係
留部７５が印字後光の位ｔＫ戻ると力伝達部材７３に衝
突し、リバウンドを起こしそのリバウンド動作が落ちつ
くまで次の印字動作又は飛行動作が困難となる。すなわ
ち、印字ワイヤ７４、係留部７５ｔ−自由飛行させるた
めには力伝達部材７３と係留部７５とが各々力伝達され
るだけの硬度が必要でアシ、軟質性の材料では圧電素子
７１の動作が吸収され自由飛行が困難となる口反面、係
留部７５が印字後光の位置に戻ったとき、すなわち力伝
達部材７３に接触したときは硬質性の材料による反発で
リバウンドを起こしてしまう。圧電素子７１の動作は高
速性があるものの変位量が小さいため、リバウンド量が
大きいと次の飛行動作が困難となる。プリンタ印字ハン
マは簡単で小型の構造が要求されるとともに印字速度の
高速化も要求されてお９、前記リバウンドが落ちつくま
での待ち時間が大きいことは高速化を図る上で問題とな
る。When a voltage is applied to the piezoelectric element 71 during printing, the piezoelectric element 7
1 extends at high speed in the direction of arrow A, and the force transmitting member 73 is also displaced. Therefore, the printing wire 74 and the mooring part 75 are accelerated by the force transmission member 73, fly freely over a distance far longer than the amount of extension of the piezoelectric element 71, and print a dot with the tip of the printing wire 74. A free-flying printing hammer using a piezoelectric element has a simple structure and can be miniaturized. However, in the method of free flight by applying force to the mooring part 75 by high-speed operation of the piezoelectric element, on the other hand, when the printing wire 74 and the mooring part 75 return to the printing afterlight distance tK, they collide with the force transmission member 73 and rebound. The next printing operation or flight operation becomes difficult until the rebound operation subsides. That is, in order to allow the printing wire 74 and the mooring portion 75t to fly freely, the force transmitting member 73 and the mooring portion 75 must be hard enough to transmit force, and soft materials may hinder the operation of the piezoelectric element 71. On the other hand, when the mooring portion 75 returns to the position of the print halo, that is, when it comes into contact with the force transmission member 73, rebound occurs due to repulsion by the hard material. Although the piezoelectric element 71 operates at high speed, the amount of displacement is small, so if the amount of rebound is large, the next flight operation will be difficult. Printer printing hammers are required to have a simple and compact structure as well as high printing speed9, and the long waiting time for the rebound to settle down poses a problem in increasing the speed.

（発明の目的） 本発明は仁のような従来の欠点を除去し、高速動作が可
能で信頼性の高い印字ハンマを提供することにある。(Object of the Invention) An object of the present invention is to provide a printing hammer that eliminates the conventional drawbacks such as nicks and is capable of high-speed operation and is highly reliable.

（発明の構成） 本塁間によれば電歪又は圧電素子の伸縮動作により印字
動作する印字ハンマにおいて、印字針と飛行部材を有す
る板ばねと、力伝達部材と接続しその力伝達部材面よ）
前記飛行部材に力を与える第一の電歪又は圧電素子と、
緩衝部材を有しその緩衝部材を介して前記飛行部材の復
帰動作を制動する第二の電歪又は圧電素子とから構成さ
れたことｔ−特徴とする印字ハンマが得られる。(Structure of the Invention) According to Hondoma, in a printing hammer that performs printing by the expansion and contraction movement of an electrostrictive or piezoelectric element, a plate spring having a printing needle and a flight member, connected to a force transmission member, and a surface of the force transmission member)
a first electrostrictive or piezoelectric element that applies force to the flight member;
A printing hammer characterized in that it comprises a buffer member and a second electrostrictive or piezoelectric element that brakes the returning movement of the flight member via the buffer member.

（構成の詳細な説明） 本発明は上述の構成をとることにより従来技術の問題点
全解決し九〇 まず第一の電歪又は圧電素子に電圧を印加すると電歪又
は圧電素子は微少ながら非常に速く変位するため飛行部
材は電歪又は圧電素子の前面に設けられた力伝達部材よ
）力を受けて加速され力伝達部材を離れ飛行する。その
後飛行部材にある印字針はプラテン上の用紙、インクリ
ボンを打撃し印字動作をする。さらに、飛行部材は元の
位置へ復帰動作をするが、このとき緩衝材を設けた第二
の電歪又は圧電素子を励起する。前記第一の電歪又は圧
電素子の励起は飛行部材を自由飛行させるための間だけ
励起されれば良く、飛行部材が力伝達部材を離れた時点
で印加電圧を停止して良い。(Detailed explanation of the structure) The present invention solves all the problems of the prior art by adopting the above-mentioned structure.90 First, when a voltage is applied to the first electrostrictive or piezoelectric element, the electrostrictive or piezoelectric element Because the flying member is displaced quickly, the flying member is accelerated by the force (from the force transmitting member provided in front of the electrostrictive or piezoelectric element), leaves the force transmitting member, and flies. Thereafter, the printing needle on the flying member hits the paper and ink ribbon on the platen to perform a printing operation. Further, the flying member returns to its original position, and at this time excites the second electrostrictive or piezoelectric element provided with the cushioning material. The first electrostrictive or piezoelectric element may be excited only while the flying member is in free flight, and the applied voltage may be stopped when the flying member leaves the force transmitting member.

そのため飛行部材の復帰時には第二の電歪又は圧電素子
は励起により第一の電歪又は圧電素子よりも飛行部材に
近い位置に面することになり、飛行部材は第二の電歪又
は圧電素子上の緩衝材に衝突する。その後第二の電歪又
は圧電素子への電圧の停止により飛行部材は緩衝材上で
制動され元の位置に戻る。このとき第二の電歪又は圧電
素子への印加電圧を急激に停止しても飛行部材は緩衝材
上にあるためリバウンド量は小さく、そのために制動時
間を短くすることができ１次の動作を早めることができ
る。このように次の動作の待ち時間を短くすることがで
きる結果高速の印字ハンマを得ることができる０ （実施例） 以下本発明の実施例について図面を参照して詳細に説明
する。Therefore, when the flight member returns, the second electrostrictive or piezoelectric element faces a position closer to the flight member than the first electrostrictive or piezoelectric element due to excitation, and the flight member It collides with the cushioning material above. Thereafter, by stopping the voltage to the second electrostrictive or piezoelectric element, the flying member is braked onto the buffer material and returns to its original position. At this time, even if the voltage applied to the second electrostrictive or piezoelectric element is abruptly stopped, the amount of rebound is small because the flight member is on the cushioning material, so the braking time can be shortened and the primary operation can be stopped. You can hasten it. As described above, the waiting time for the next operation can be shortened, and as a result, a high-speed printing hammer can be obtained. (Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

第１図は本発明の一実施例を示す図であシ、第２図は第
１図の実施例の使用形態を説明するための図である。第
１図において、自由端に印字針１１と飛行部材１２ｔ−
設けた板ばね１３を取付部材１４に固定する。また、飛
行部材１２の裏面には第一の圧電素子１５と第二の圧電
素子１６ｔ−並べるように取付部材１４に接続する。こ
のとき、第一。FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a diagram for explaining a usage pattern of the embodiment of FIG. In FIG. 1, the printing needle 11 and the flying member 12t-
The provided leaf spring 13 is fixed to the mounting member 14. Further, on the back surface of the flight member 12, a first piezoelectric element 15 and a second piezoelectric element 16t are connected to the mounting member 14 so as to be arranged side by side. At this time, the first.

第二の圧電素子１５．１６はそれぞれ伸縮方向が飛行部
材１２に向くように配置され、また第一の圧電素子１５
の前面には金属の如き硬質材料である力伝達部材１７ｆ
ｔ設け、その力伝達部材１７と飛行部材１２とが接触す
るように板ばね１３で飛行部材１２を力伝達部材１７に
押圧する０さらに、第二の圧電素子１６の前面にはゴム
やプラスティックの如き緩衝効果のある緩衝部材１８を
設けている。The second piezoelectric elements 15 , 16 are arranged such that their expansion and contraction directions face the flight member 12 , and the first piezoelectric elements 15 , 16
A force transmitting member 17f made of a hard material such as metal is mounted on the front surface of the
t is provided, and the flight member 12 is pressed against the force transmission member 17 by the plate spring 13 so that the force transmission member 17 and the flight member 12 are in contact with each other. A buffer member 18 having a buffering effect is provided.

このような構造において、！ｌず第一の圧電素子１５に
電圧を印加すると第２図（ａ）のように第一の圧電素子
１５は矢印Ａの方向に高速で変位を生じ、力伝達部材１
７よりカを受けて飛行部材１２．及び印字針１１は前方
へ加速される。この場合第２図（ｃ）に示すように印字
針１１．飛行部材１３は第一の圧電素子１５の伸び２０
よりもはるかに長い距離を自由飛行２１して、印字針１
１はプラテン２２、印字用紙２３．インクリボン２４を
打撃し印字動作を行なう、このとき飛行部材１２は第一
の圧電素子１５の最大速度発生時に自由飛行を行なうた
め第一の圧電素子１５の印加電圧２５の時間は飛行部材
１２が自由飛行した時点で停止して良い。一方、前記の
印字した後、印字針１１と飛行部材１２は印字の衝撃力
による反作用と板ばね１３の復帰力により元の位置に戻
る動作になるが、このとき第２図（ｂｌ（ｃ）に示すよ
うに、第二の圧電素子１６に電圧２６を印加する。前記
したように第一の圧電素子１５は飛行させるための動作
は終わっているため元の位置に戻っており、第二の圧電
素子１６は励起されることにより矢印Ｂの方向への伸び
２７を生じて第一の圧電素子１５よりも飛行部材１２の
側につき出ている。このため飛行部材１２は第二の圧電
素子１６前面の緩衝部材１８と衝突し、緩衝効果により
制動される０その後第二の圧電素子１６への通電停止に
より、飛行部材１２は元の位置に戻る。この第二の圧電
素子１６の通電２６は飛行部材１２の復帰とタイミング
が合うようにセットしても良いが、プリンタにおいては
プラテン２２と印字針１１との距離、すなわちプラテン
ギャップを変更することが多いため、タイミングをとる
ことよフも、第一の圧電素子１５の駆動終了後第二の圧
電素子１６に通電しておく方がドライバ回路としても簡
単な構造となる。圧電素子はコンデンサで６）通電時間
が長くてもエネルギからみて同じである０このようＫｇ
二の圧電素子１６前面に緩衝部材１８に−設けることは
飛行部材１２のリバウンド＆１大幅に低減し、単時間で
次の動作が開始でき、プリンタに必要な高速印字ハンマ
が得られる。第２図（４）はこのような第二の圧電素子
１６と緩衝部材１８を用いない従来の例があるが、飛行
部材１２を自由飛行させるため力伝達効率の良い硬質の
力伝達部材１７だけ？用いると飛行条件は良いが、反面
復温時には飛行部材１２は力伝達部材１７と衝突して大
きなリパウンドのある動作２８となる・このリパクンド
徽は自由飛行の半分近くなることもあり、このリバウン
ドが制動するまで多大な時間を要する０本発明ではこの
ような問題を除去し、単時間で制動でき、高速で印字動
作できるハンマが得られるり第３図は１本発明の印字ハ
ンマを複数個潰−列に配置してラインプリンタ用ハンマ
に適用したものである。第３図において、並列された各
ハンマにおける第一の圧電素子１５の駆動による印字針
１１、飛行部材１２の自由飛行、及び第一の圧電素子１
５への通電停止と第二の圧電素子１６の通電による制動
は前記第１図と同様の動作、効果が得られる。In such a structure! When a voltage is applied to the first piezoelectric element 15, the first piezoelectric element 15 is displaced at high speed in the direction of arrow A, as shown in FIG.
7, the flying member 12. And the printing needle 11 is accelerated forward. In this case, as shown in FIG. 2(c), the printing needle 11. The flight member 13 has an extension 20 of the first piezoelectric element 15.
Free flight 21 over a much longer distance than the printing needle 1
1 is a platen 22, a printing paper 23. The ink ribbon 24 is struck to perform a printing operation. At this time, the flying member 12 flies freely when the first piezoelectric element 15 generates the maximum speed. You can stop when you are in free flight. On the other hand, after printing, the printing needle 11 and the flight member 12 return to their original positions due to the reaction of the printing impact force and the return force of the leaf spring 13, but at this time, as shown in FIG. As shown in , a voltage 26 is applied to the second piezoelectric element 16.As mentioned above, the first piezoelectric element 15 has returned to its original position since the operation for flying has been completed, and the second piezoelectric element 15 has returned to its original position. When the piezoelectric element 16 is excited, it causes an elongation 27 in the direction of arrow B and protrudes closer to the flying member 12 than the first piezoelectric element 15. Therefore, the flying member 12 extends beyond the second piezoelectric element 16. After colliding with the front buffer member 18 and being braked by the buffer effect, the flight member 12 returns to its original position by stopping the energization to the second piezoelectric element 16.The energization 26 of the second piezoelectric element 16 It may be set so that the timing matches the return of the flying member 12, but in printers, the distance between the platen 22 and the printing needle 11, that is, the platen gap, is often changed, so it is not necessary to set the timing properly. The structure of the driver circuit is simpler if the second piezoelectric element 16 is energized after the first piezoelectric element 15 is driven.The piezoelectric element is a capacitor, and 6) Even if the energization time is long, the energy is the same. 0 like this Kg
By providing the buffer member 18 in front of the second piezoelectric element 16, the rebound of the flying member 12 is greatly reduced, the next operation can be started in a short time, and a high-speed printing hammer necessary for the printer can be obtained. Fig. 2 (4) shows a conventional example in which such a second piezoelectric element 16 and buffer member 18 are not used, but in order to allow the flying member 12 to fly freely, only a hard force transmitting member 17 with good force transmitting efficiency is used. ? When used, the flight conditions are good, but on the other hand, during rewarming, the flight member 12 collides with the force transmission member 17, resulting in a movement 28 with a large rebound. This rebound can be nearly half of free flight, and this rebound It takes a long time to brake.The present invention eliminates this problem and provides a hammer that can be braked in a short time and performs high-speed printing. - It is arranged in rows and applied to hammers for line printers. In FIG. 3, the free flight of the printing needle 11 and the flying member 12 due to the drive of the first piezoelectric element 15 in each parallel hammer, and the first piezoelectric element 1
Braking by stopping the energization to the piezoelectric element 5 and energizing the second piezoelectric element 16 provides the same operation and effect as in FIG. 1 above.

第４図は本発明の他の実施例を示す図である〇第４図は
、第一、第二の圧電素子１５，１６．及び印字ワイヤー
４１．飛行部材１２ｔ−有する板ばね１３より構成され
る印字ハンマを円筒状の取付部材４２に放射状に配置し
たシリアルプリンタ用の印字ハンマの断面図である口こ
の場合、印字針として印字ワイヤー４１用いているため
ガイド孔４３を設けているが、このようなシリアルプリ
ンタ用印字ハンマにおいても第一の圧電素子１５の通電
励起によりカ伝達部材１７は飛行部材１２％印字ワイヤ
ー４１を飛行させ、また第二の圧電素子１６の通電及び
緩衝部材１８による制動効果があることは言うまでもな
い。FIG. 4 is a diagram showing another embodiment of the present invention. FIG. 4 shows first, second piezoelectric elements 15, 16, . and printing wire 41. This is a cross-sectional view of a printing hammer for a serial printer in which a printing hammer composed of a leaf spring 13 having a flying member 12t is arranged radially on a cylindrical mounting member 42. In this case, a printing wire 41 is used as a printing needle. However, even in such a printing hammer for a serial printer, when the first piezoelectric element 15 is energized and excited, the force transmission member 17 causes the flying member 12% printing wire 41 to fly, and the second Needless to say, there is a braking effect due to the energization of the piezoelectric element 16 and the damping member 18.

第５図は本発明の他の実施例であシ、力伝達部＠’１７
と緩衝部材１８とに接触する飛行部材５１の面を球状に
した一実施例である◎球状゛面は力伝達部材１７及び緩
衝部材１８と点接触とな９面接触に比べ片面９もなく、
第一の圧電素子１５の通電励起による飛行動作、及び第
二の圧電素子１６のＡ１１を励起による制動が安定する
０このことは印字動作も安定することＫなシ印字濃度に
ムラが少なくなシ良好な印字品質が得られる効果がある
。FIG. 5 shows another embodiment of the present invention, a force transmitting part @'17
This is an embodiment in which the surface of the flight member 51 that contacts the buffer member 18 is made spherical. The spherical surface makes point contact with the force transmitting member 17 and the buffer member 18, and there is no 9 on one side compared to a 9-surface contact.
The flight motion by energizing the first piezoelectric element 15 and the braking by exciting A11 of the second piezoelectric element 16 are stabilized. This means that the printing operation is also stable. This has the effect of providing good print quality.

この点接触の方法は他にも円すい形の形状等もあるし、
また、ｍＩＩ！触にした円筒状の飛行部材、さらには逆
に力伝達部材１７や緩衝部材１８を球状や円筒状にした
場合でも効果かめる。There are other ways to make point contact, such as a conical shape,
Also, mII! The effect can be seen even when the flying member is cylindrical in shape, or even when the force transmitting member 17 and the buffer member 18 are made spherical or cylindrical.

第６図は本発明の他の一実施例であり、制動用の第二の
圧電素子をバイモルフＮの圧電素子を用ｖｈ九印字ハン
マで６る◎第６図において、取付部材６１には先端面に
力伝達部材１７ｔ−接続した第一の圧電素子１５ｔ−設
け、その第一の圧電素子１５は通電時に矢印人の方向へ
変位するように取付ける。また力伝達部材１７の前方に
は印字針１１と飛行部材１２を設けた板ばね１３を重付
部材６１に接続する。さらに、板はね１３の裏面には制
動用板ばね６２と横効果のある圧電素子を接合したパイ
モハフ型の第二の圧電素子６３ｔ−配置し、その先端に
は緩衝部材６４ｔ−設ける。このような構造において、
第一の圧電素子１５の通電励起による飛行部材１２．及
び印字針１１は自由飛行し印字動作を行なう。その後復
帰時には第二の圧電素子６３を通電励起する。衆知のよ
うに、バイモルフ型圧電素子は横効果によル制動用板ば
ね６２をたわませるため、緩衝部材６４はそのたわみに
より飛行部材１２ｗ４へ動く。そこで飛行部材１２又は
板ばね１３は復帰時に緩衝部材６４に衝突し制動される
。このようなバイモルフ型素子による第二の圧電素子６
３は第一の圧１！索子１５に比べ緩衝部材６４の位置と
なる出力端からみた剛性が低く、ｉ九反発力が小さく、
第二の圧を索子６３自身が緩衝効果もｔｔ）シ制動が容
易となる０以上１本発明において、圧電素子として単板
の縦効果、横効果のある場合、また複数枚積層した場合
の他、さらには電歪索子を用いても適用可能であり同様
の効果が得られる０ （発明の効果） 本発明によれば、第一の圧電素子を用いて印字針を自由
飛行させ、第二の圧電素子によＦ）リバウンドを制動す
ることにより印字速度が速く、また簡単な構造である印
字ハンマが得られる０Fig. 6 shows another embodiment of the present invention, in which the second piezoelectric element for braking is a bimorph N piezoelectric element.In Fig. 6, the mounting member 61 has a tip. A first piezoelectric element 15t connected to a force transmitting member 17t is provided on the surface, and the first piezoelectric element 15 is mounted so as to be displaced in the direction of the arrow when energized. Further, in front of the force transmitting member 17, a plate spring 13 provided with a printing needle 11 and a flying member 12 is connected to a weighting member 61. Further, on the back surface of the plate spring 13, a second piezoelectric element 63t of a Paimohaf type in which a braking plate spring 62 and a piezoelectric element with a lateral effect are bonded is arranged, and a buffer member 64t is provided at the tip thereof. In such a structure,
Flight member 12 by energizing excitation of first piezoelectric element 15. The printing needle 11 then flies freely and performs a printing operation. Thereafter, upon return, the second piezoelectric element 63 is energized and excited. As is well known, the bimorph piezoelectric element deflects the brake leaf spring 62 due to the transverse effect, and the buffer member 64 moves toward the flight member 12w4 due to the deflection. Therefore, the flight member 12 or the leaf spring 13 collides with the buffer member 64 upon return and is braked. A second piezoelectric element 6 made of such a bimorph type element
3 is the first pressure 1! Compared to the cord 15, the rigidity is lower when viewed from the output end where the buffer member 64 is located, and the repulsive force is smaller.
The second pressure can be easily damped by the cord 63 itself (tt). In addition, it is also possible to use an electrostrictive element, and the same effect can be obtained.0 (Effects of the Invention) According to the present invention, the printing needle is made to fly freely using the first piezoelectric element, and the printing needle is made to fly freely using the first piezoelectric element. F) By braking the rebound using the second piezoelectric element, a printing hammer with a fast printing speed and a simple structure can be obtained.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例を示す図、第２図は第１図の
使用形態を説明するための図、第３図は第１図の本発明
の印字ハンマを並べてラインプリンタ用印字ヘッドにし
た一実施例を示す模式的斜視図、第４図は本発明の他の
実施例を示す図、第５図は本発明の他の実施例を示す図
、第６図は本発明の他の実施例を示す図、第７図は従来
の実施例を示す図である〇 図中各記号はそれぞれ次の内容を示す口１１・・・印字
針、１２．５１・・・飛行部材、１３・・・板ばね、Ｚ
　４＊　　４２ｔ　６１・・・取付部材、１５・・・第
一の圧電素子、１６．６３・・・第二の圧電素子。 １７・・・力伝達部材、１８・・・緩衝部材、２０・・
・第一の圧電素子の伸び、２１．２８・・・印字針、飛
行部材の動作、２２・・・プラテン、２３・・・印字用
紙、２４・・・インクリボン、２５・・・第一の圧電素
子の印加電圧、２６・・・第二の圧電素子の印加電圧、
２７・・・第二の圧電素子の伸び、４１・・・印字ワイ
ヤー、４３・・・ガイド孔、６２・・・制動用板ばね、
７１・・・圧電素子、７２・・・取付部材、７３・・・
力伝達部材、７４・・・印字ワイヤ、７５・・・係留部
、７６・・・コイルばね、７７・・・ガイド孔口 １い）、□２．工１１．い、′９、“′７ｉ−１図 旧緩衝部材 オ　２　図 ７１−３　図 １２飛行部材 ７Ｉ−４図 １３板はね ７１−５　図 旧緩衝部材 オ６図 ７ｉ−７図 ７７ガイド孔Fig. 1 is a diagram showing an embodiment of the present invention, Fig. 2 is a diagram for explaining the mode of use of Fig. 1, and Fig. 3 is a diagram showing the printing hammer of the present invention shown in Fig. FIG. 4 is a diagram showing another embodiment of the present invention, FIG. 5 is a diagram showing another embodiment of the present invention, and FIG. 6 is a diagram showing another embodiment of the present invention. Figures showing other embodiments, Figure 7 is a diagram showing a conventional embodiment. In the figures, each symbol indicates the following contents: 11...printing needle, 12.51...flying member, 13... Leaf spring, Z
4*42t 61... Mounting member, 15... First piezoelectric element, 16.63... Second piezoelectric element. 17... Force transmission member, 18... Buffer member, 20...
- Elongation of first piezoelectric element, 21.28...Printing needle, operation of flying member, 22...Platen, 23...Printing paper, 24...Ink ribbon, 25...First Applied voltage of the piezoelectric element, 26... Applied voltage of the second piezoelectric element,
27... Elongation of second piezoelectric element, 41... Printing wire, 43... Guide hole, 62... Braking leaf spring,
71...Piezoelectric element, 72...Mounting member, 73...
Force transmission member, 74...Printing wire, 75...Mooring portion, 76...Coil spring, 77...Guide hole opening 1), □2. Engineering 11. Figure 12 Flight member 7I-4 Figure 13 Plate 71-5 Old buffer member Figure 6 Figure 7i-7 Figure 77 Guide hole

Claims (1)

【特許請求の範囲】[Claims] 電歪又は圧電素子の伸縮動作により印字動作する印字ハ
ンマにおいて、印字針と飛行部材を有する板ばねと、力
伝達部材と接続しその力伝達部材面より前記飛行部材に
力を与える第一の電歪又は圧電素子と、緩衝部材を有し
その緩衝部材を介して前記飛行部材の復帰動作を制動す
る第二の電歪又は圧電素子とから構成されることを特徴
とする印字ハンマ。A printing hammer that performs a printing operation by expanding and contracting an electrostrictive or piezoelectric element includes a plate spring having a printing needle and a flying member, and a first electric current that is connected to a force transmitting member and applies force to the flying member from the surface of the force transmitting member. A printing hammer comprising a strain or piezoelectric element and a second electrostrictive or piezoelectric element that has a buffer member and brakes the return movement of the flight member via the buffer member.