JPS61233560A - Piezoelectric printing head - Google Patents

Abstract

PURPOSE:To obtain a small-sized printing head obtaining large displacement quantity, stabilized in printing operation and imparting good printing quality, by using a buckling spring displaced and enlarged by a lever arm and the own deformation. CONSTITUTION:In a piezoelectric type printing head wherein a printing needle 8 is allowed to freely fly by the extending and contracting action of an electrostriction or piezoelectric element 1 to perform printing, a lever arm 4 for transmitting the operation of the electrostriction or piezoelectric element 1, a buckling spring 6 connected so as to receive the transmission of displacement in the axial direction from the leading end of said lever arm 4, a movable part 7 arranged so as to freely fly to a printing direction upon the reception of force from said buckling spring 6 and a return spring 9 for returning said movable part 7 and the printing needle 8 is provided to the movable part 7. The displacement quantity of the electrostriction or piezoelectric element 1 is enlarged by the lever arm 4 and the buckling spring 6. The movable part 7 having the printing needle 8 is supported by the return spring 9 to receive force from the buckling spring 6 and freely flies at the time when the speed of the buckling spring 6 is max. and the printing needle 8 also operates forwardly along with the operation of the movable part and the return spring and strikes a platen 11, printing paper 12 and an ink ribbon 13 to perform printing operation.

Description

【発明の詳細な説明】 本発明は電気・機械変換素子の運動を増幅し駆動する機
械的増幅機構に関し、さらに詳しくは電歪あるいは圧電
素子を駆動源として印字針を自由飛行（フライト）させ
て印字を行なうプリンタ用印字ヘッドに関する。[Detailed Description of the Invention] The present invention relates to a mechanical amplification mechanism that amplifies and drives the motion of an electromechanical transducer, and more specifically, the present invention relates to a mechanical amplification mechanism that amplifies and drives the motion of an electromechanical transducer, and more specifically, it uses an electrostrictive or piezoelectric element as a drive source to cause a printing needle to fly freely. The present invention relates to a print head for a printer that performs printing.

（従来の技術とその問題点） 従来、プリンタ用印字ヘッドとしては永久磁石や電磁石
を用いたものが使用されているものが多く、その中で永
久磁石の吸引力でばねを吸引し、印字時にコイルでその
吸引力を打ち消してばねの復帰力で印字する方法や、そ
のばねの力により印字針を自由飛行（フリーフライト）
シ、その印字針の運動量で印字する方法がある。これら
のうち、後者のフリーフライト方式は印字針の移動量（
ストローク）が大きく、調整が容易である利点がある。(Conventional technology and its problems) Conventionally, many print heads for printers have used permanent magnets or electromagnets.The permanent magnet's attractive force attracts a spring, and when printing, There is a method of canceling the attraction force with a coil and printing with the return force of a spring, and a method of making the printing needle fly freely (free flight) using the force of the spring.
There is a method of printing using the momentum of the printing needle. Of these, the latter free flight method uses the printing needle's movement distance (
It has the advantage of a large stroke (stroke) and easy adjustment.

しかしながら、これらの電磁方式においては銅損、鉄損
の損失があり、電気・機械エネルギ変換効率が低い問題
がある。そこで最近で社電歪素子や圧電素子を用いた方
法が考えられている。この方法は従来の電磁方式に比ベ
エネルギ効率が３〜４倍に向上できることが特長である
。However, these electromagnetic methods have copper loss and iron loss, and have a problem of low electrical/mechanical energy conversion efficiency. Therefore, methods using electrostrictive elements or piezoelectric elements have recently been considered. The feature of this method is that the specific energy efficiency can be improved by three to four times compared to the conventional electromagnetic method.

従来提案されているものとしては第４図に示す特開昭５
９−４５１６５号公報記載の印字ヘッドがある。As for what has been proposed so far, the Japanese Patent Application Laid-Open No. 5
There is a print head described in Japanese Patent No. 9-45165.

第４図において、圧電体２４ＩＩｉ結合部材２５および
２６と可動部材２７を備なえることにより圧電体２４の
励起時の変位を拡大してワイヤ２８へ伝達する。そのと
きワイヤ２８の係留部２９は撃力を受けてワイヤ２８は
ガイド孔３０に沿って滑動しフライトして印字動作を行
なう。このような方法は圧電体２４の励起時の変位が一
般に０．０１　ｗ程度の微少量であるため可動部材２７
により変位を拡大し、その拡大変位によりワイヤ２８を
フライトさせるものである。この方法は圧電体２４とワ
イヤ２８と係留部２９とを含めた重さと圧電体２４の剛
性及びワイヤ２８の復帰に必要なコイルばね３１のばね
定数によってワイヤ２８は単振動の如き動作をしてフラ
イトして印字が可能となる。しかしながら、フライト方
式でワイヤ２８を７ライトさせるには、ワイヤ２８に助
走のための変位を与え、可動部２７の最大速度達成時に
ワイヤ２８が可動部材２７を離れフライトする方式と、
ワイヤ２８に可動部材２７が衝突してその力積によりフ
ライトする方式があるが、いずれの場合もワイヤ２８の
７ライトのためには可動部材２７の変位が必要である。In FIG. 4, the displacement of the piezoelectric body 24 when excited is magnified and transmitted to the wire 28 by providing the piezoelectric body 24IIi coupling members 25 and 26 and the movable member 27. At this time, the mooring portion 29 of the wire 28 receives an impact force, and the wire 28 slides along the guide hole 30 and flies to perform a printing operation. In such a method, since the displacement of the piezoelectric body 24 when excited is generally a small amount of about 0.01 W, the movable member 27
This expands the displacement, and the expanded displacement causes the wire 28 to fly. In this method, the wire 28 moves like a simple harmonic motion due to the weight including the piezoelectric body 24, the wire 28, and the anchoring part 29, the rigidity of the piezoelectric body 24, and the spring constant of the coil spring 31 necessary for returning the wire 28. Printing is possible after flight. However, in order to make the wire 28 write 7 times using the flight method, there is a method in which the wire 28 is given a displacement for run-up, and when the movable part 27 reaches the maximum speed, the wire 28 leaves the movable member 27 and flies.
There is a method in which the movable member 27 collides with the wire 28 and flight occurs due to the force of the collision, but in either case, the movable member 27 must be displaced in order to cause the wire 28 to write 7 times.

またその変位量は０．１〜０．２ｍｆｉど必要であるの
が一般である。この変位量はフライト手段に必要である
上に使用時におけるゴミの付着による不安定な動作を防
止するために大きくする必要かある。すなわち、変位量
を大きくできれは外乱に対しても印字動作が安定するし
、また印字ヘッド組立調整が容易になり製造コストは低
くすることができる。そのため可動部材２７により圧電
体２４の変位を拡大することが必要となるが、この方法
では前記所要の変位を得ようとすれば可動部材２７の長
さけ極めて大きくなり、プリンタ印字ヘッドに要求され
る小型化が望応ない。例えば、圧電体２４の励起時の伸
びを０．０１ｍとし、結合部材２５．２６間５■とする
と可動部２７は５０〜１００ｕ必要となり極めて大型と
なる。また結合部材２５．２６０間は圧電体２４０幅又
は厚さより大きくしなければならないので小さくても４
〜５ｆｌ程度であり、その場合は可動部材２７の長さは
４０〜８０ｍとなる。Further, the amount of displacement is generally required to be 0.1 to 0.2 mfi. This amount of displacement is not only necessary for the flight means, but also needs to be increased in order to prevent unstable operation due to adhesion of dust during use. That is, if the amount of displacement can be increased, the printing operation will be stabilized even against disturbances, and the assembly and adjustment of the print head will be easier and manufacturing costs can be lowered. Therefore, it is necessary to expand the displacement of the piezoelectric body 24 by means of the movable member 27, but in this method, if the desired displacement is to be obtained, the length of the movable member 27 becomes extremely large, which is required for the printer print head. Downsizing is not desirable. For example, if the elongation of the piezoelectric body 24 when excited is 0.01 m, and the distance between the coupling members 25 and 26 is 5 cm, the movable part 27 will require 50 to 100 u, making it extremely large. Also, the distance between the connecting members 25 and 260 must be larger than the width or thickness of the piezoelectric body 240, so the distance between the connecting members 25 and 260 must be at least 4
~5 fl, and in that case, the length of the movable member 27 will be 40 ~ 80 m.

また、このような場合は可動部材２７０重さも重くなり
、駆動時は慣性力が大きくなり、圧電体２４を引張るこ
とになら破壊される問題がある。さらにこの実施例にお
いて、コイルばね３１はワイヤ２８の復帰のためだけの
役目をしているので駆動時にはワイヤ２８の動作が不安
定となりワイヤ２８を支えるガイド孔３０を長くする必
要もあるし、また不安定動作により摩擦が大きくなり、
寿命が短いという問題がある。Further, in such a case, the weight of the movable member 270 becomes heavy, and the inertia force increases during driving, so that if the piezoelectric body 24 is pulled, there is a problem that it may be destroyed. Furthermore, in this embodiment, since the coil spring 31 serves only to return the wire 28, the movement of the wire 28 becomes unstable during driving, and the guide hole 30 supporting the wire 28 needs to be lengthened. Unstable operation increases friction,
The problem is that it has a short lifespan.

（発明の目的） 本発明の目的は上述の従来の欠点を除去し、小型で、フ
ライトのための助走変位が大きく、安定した印字動作の
できる圧電式印字ヘッドを提供することにある。(Object of the Invention) An object of the present invention is to eliminate the above-mentioned conventional drawbacks, and to provide a piezoelectric print head that is small, has a large run-up displacement for flight, and can perform stable printing operations.

（発明の構成） 本発明によれば電歪あるいは圧電素子の伸縮動作により
印字針を自由飛行させ印字を行なう圧電式印字ヘッドに
おいて、前記電歪あるい鉱圧電素子の動作を伝達するた
めのレバーアームと、そのレバーアームの先端から軸方
向に変位が伝達されるように接続された座屈ばねと、そ
の座屈ばねから力を受けて印字方向に自由飛行するよう
配置された可動部と、その可動部を復帰するための復帰
ばねとから構成され、可動部には印字針が設けられてい
ることを特徴とする圧電式印字ヘッドが得られる。(Structure of the Invention) According to the present invention, in a piezoelectric print head that performs printing by causing a printing needle to fly freely by the expansion and contraction movement of an electrostrictive or piezoelectric element, a lever for transmitting the movement of the electrostrictive or piezoelectric element is provided. an arm, a buckling spring connected to transmit displacement in the axial direction from the tip of the lever arm, and a movable part arranged to receive force from the buckling spring and fly freely in the printing direction; A piezoelectric print head is obtained, which is comprised of a return spring for returning the movable part, and is characterized in that the movable part is provided with a printing needle.

（本発明の作用・原理） 本発明は上述の構成をとることにより従来の問題を解析
した。まず電歪あるいは圧電素子の励起による変位量は
てこの原理を用いたレバーアームにより拡大される。ま
た、そのレバーアーム先端での拡大変位量は、レバーア
ーム先端に接続された座屈ばね軸方向に伝達され、その
座屈ばねは座屈理論で明らかなように軸方向の変位に対
して拡大されたたわみ量を生じる。すなわち、電歪ある
い祉圧電素子の変位量はレバーアームと座屈ばねにより
拡大される。このとき、座屈ばね前方の印字針を有する
可動部は復帰ばねにより支持され座屈ばねより力を受け
、座屈ばねの速度の最大時に自由飛行し、可動部と復帰
ばねの動作とともに印字針も前方に動作し、プラテン、
印字用紙、インクリボンを打撃し印字動作を行なう。座
屈ばねはレバーアーム先端より軸方向に変位が伝達され
る構成となるため、ヘッドは小型の構成が可能となり、
かつ座屈ばね中央部の変位が大きいため、可動部は容易
に自由飛行でき、かつゴミ等の付着による印字ムラの間
Ｍが回避できる。(Operation/Principle of the Present Invention) The present invention analyzes the conventional problems by adopting the above-described configuration. First, the amount of displacement due to electrostriction or excitation of the piezoelectric element is magnified by a lever arm using the lever principle. In addition, the amount of expansion displacement at the tip of the lever arm is transmitted in the axial direction of the buckling spring connected to the tip of the lever arm, and as is clear from buckling theory, the buckling spring expands in response to displacement in the axial direction. resulting in the amount of deflection. That is, the amount of displacement of the electrostrictive or piezoelectric element is expanded by the lever arm and the buckling spring. At this time, the movable part with the printing needle in front of the buckling spring is supported by the return spring and receives force from the buckling spring, and flies freely at the maximum speed of the buckling spring, and as the movable part and the return spring operate, the printing needle Also works forward and the platen,
Printing is performed by striking the printing paper and ink ribbon. Since the buckling spring has a structure in which displacement is transmitted in the axial direction from the tip of the lever arm, the head can be made smaller.
Moreover, since the displacement of the central part of the buckling spring is large, the movable part can easily fly freely, and M during printing unevenness due to adhesion of dust or the like can be avoided.

（実施例） 以下本発明の実施例を図面を谷点して説明する。(Example) Embodiments of the present invention will be described below with reference to the drawings.

第１−ａ図は本発明の一実施例を示す模式的な斜視図を
示し、第１−ｂ図は第１−ａ図の使用形態を説明するた
めの図である。第１−ａ図、第１−ｂ図において、電歪
あるいは圧電素子１の一端はベース２に取付けられ、他
端は電歪あるいは圧電素子１の伸縮動作を伝達する手段
３を介してレバーアーム４に接続される。またレバーア
ーム４とベース２とはもう一方の伝達手段５で接続され
、さらにレバーアーム４の先端に座屈ばね６の一端を接
続し、その座屈ばね６の他端はベース２に接続される。FIG. 1-a is a schematic perspective view showing an embodiment of the present invention, and FIG. 1-b is a diagram for explaining the mode of use of FIG. 1-a. 1-a and 1-b, one end of the electrostrictive or piezoelectric element 1 is attached to a base 2, and the other end is connected to a lever arm via means 3 for transmitting the expansion and contraction motion of the electrostrictive or piezoelectric element 1. Connected to 4. Further, the lever arm 4 and the base 2 are connected by another transmission means 5, and one end of a buckling spring 6 is connected to the tip of the lever arm 4, and the other end of the buckling spring 6 is connected to the base 2. Ru.

一方、座屈ばね６の前方には可動部７と印字針８をもつ
復帰ばね９を配置する。このような構造において、電歪
あるいは圧電素子１に電圧を加えることにより電歪ある
いは圧電素子１は伸び１０を生じ、その変位はレバーア
ーム４に伝達され、てこの原理によりレバーアーム４先
端で拡大された変位を得る。一方、レバーアーム４の先
端に接続された座屈ばね６はその軸方向に変位が与えら
れ、このとき長さｌの座屈ばね６け軸方向の変位をＹと
すると、座屈ばね６のたわみ量ＸはＸニー’ＪＹＪと近
似できるように変形し、軸方向π の変位に対して拡大された変位が座屈ばね６中央部に生
じる。このときの動作は電歪あるいは圧電素子１の動作
に対してレバーアーム４、座屈ばね６から構成される機
構振動系が応答して動作を起こす。一方、との座屈ばね
６の動作により前方の可動部７け押し出され、可動部７
とともに復帰ばね９嫁座屈はね６の速度最大の時点で自
由飛行を行なう。その後、可動部７、復帰ばね９ととも
に印字針８はプラテン１１、印字用紙１２、インクリボ
ン１３を打撃し印字動作を行なう。その後復帰ばね９の
復帰力と、印字針８とプラテン１１との印字衝撃の反作
用により元に復帰する。復帰時には、座屈ばね６は可動
部７を自由飛行させた後に電歪あるいは圧電素子１０通
電停止により元の位置に戻り、バ、クスト、プ１４によ
り静止する。On the other hand, a return spring 9 having a movable part 7 and a printing needle 8 is arranged in front of the buckling spring 6. In such a structure, by applying a voltage to the electrostrictive or piezoelectric element 1, the electrostrictive or piezoelectric element 1 causes an elongation 10, and this displacement is transmitted to the lever arm 4, which is expanded at the tip of the lever arm 4 due to the lever principle. Obtain the displacement. On the other hand, the buckling spring 6 connected to the tip of the lever arm 4 is displaced in its axial direction. At this time, if the axial displacement of the buckling spring 6 of length l is Y, then the buckling spring 6 is displaced in the axial direction. The amount of deflection X is deformed so as to be approximated as X knee'JYJ, and a displacement that is magnified with respect to the displacement in the axial direction π occurs in the center portion of the buckling spring 6. At this time, the mechanical vibration system composed of the lever arm 4 and the buckling spring 6 responds to the electrostrictive or piezoelectric element 1 to cause the movement. On the other hand, due to the action of the buckling spring 6, the front movable part 7 is pushed out, and the movable part 7 is pushed out.
At the same time, the return spring 9 performs free flight at the time when the bride buckling spring 6 reaches its maximum speed. Thereafter, the printing needle 8 together with the movable part 7 and the return spring 9 strikes the platen 11, printing paper 12, and ink ribbon 13 to perform a printing operation. Thereafter, it returns to its original state due to the return force of the return spring 9 and the reaction of the printing impact between the printing needle 8 and the platen 11. At the time of return, the buckling spring 6 allows the movable part 7 to fly freely, and then returns to its original position by stopping the energization of the electrostrictive or piezoelectric element 10, and is brought to rest by the buckle, the buckle, and the buckle 14.

その後、可動部７、復帰ばね９も印字後元に位置に戻る
。このとき、座屈ばね６Ｉｆｉダンパー効果のあるバ、
クスト、ブ１４上に配置されているため、可動部７をも
つ復帰ばね９の復帰力による力で座屈ばね６に当っても
座屈ばね６自身はアーチの如き形状をもっているので緩
衝の作用を行ない復帰動作も速い。このような構成は、
二段目の変位増幅作用のある座屈ばね６がレバーアーム
４に直角に近く設けられ、かつ印字針８を有する復帰ば
ね９、可動部７も座屈ばね６に密着するような構成であ
るため、小型でありながら座屈ばね６には大きな変位が
得られ、可動部７はゴミ等の付着があっても影響が小さ
く、安定した自由飛行を行ない、印字動作も安定する。Thereafter, the movable part 7 and the return spring 9 also return to their original positions after printing. At this time, the buckling spring 6Ifi has a damper effect,
Since the buckling spring 6 is placed on the buckle 14, even if it hits the buckling spring 6 due to the restoring force of the restoring spring 9 having the movable part 7, the buckling spring 6 itself has an arch-like shape, so it acts as a buffer. The return operation is also quick. Such a configuration is
A second-stage buckling spring 6 with a displacement amplifying effect is provided close to the lever arm 4 at a right angle, and a return spring 9 having a printing needle 8 and a movable part 7 are also configured to be in close contact with the buckling spring 6. Therefore, although it is small, the buckling spring 6 can obtain a large displacement, and even if dust or the like adheres to the movable part 7, the influence is small, stable free flight is performed, and the printing operation is also stable.

これらレバーアーム４、ベース２は一体として打抜き法
、切削、エツチング等により製作でき、また座屈はね６
もばね性があれば金属の他プラスチ、りの如き複合材料
でも可能である。また本発明では電歪あるいは圧電素子
１は積層したものを示しているが、縦効果、横効果のあ
る単板素子においても適用できる。また他の一実施例を
第２図に示す。第２図は圧電式印字ヘッドを３個並べた
模式的な斜視図である。第２図において、電歪あるいは
圧電素子１はレバーアーム４、座屈ばね６とともにベー
ス１５に接続される。また、ベース１５はハウジング１
６に固定され、さらに可動部７、印字針８を有している
復帰ばね１７は複数のばねを一体としたものから構成さ
れてハウジング１６に固定されて座屈ばね６前方に配置
される。このような構成は複数のヘッドを横一列に並べ
ることによりドツトインパクトラインプリンタが構成で
き、複数ばねの一体化により印字品質に重要な印字針８
のピッチ精度を十分確保できる効果がある。可動部７は
座屈ばね６表面上に配置されれば良いので、ベース１５
の配列ビ、チは精度が悪くても復帰ばね１７の精度によ
り印字針８は正確な配列ピッチが得られｌ：ＩＪ子品買
の良好なヘッドが可能であり、また組立てが容易である
ため製造コストが安くなる効果がある。また他の一実施
例としてシリアルプリンタヘッドに適用した断面図を第
３図に示す。第３図において、円筒形ベース１８上に、
電歪あるいは圧電素子１を接続し、さらに変位伝達手段
１９を介してレバー７−ム２１接続し、かつベース１８
とレバーアーム２０間に座屈ばね６を接続する。一方、
可動部７をもつ復帰ばね２１もベース１８上に固定され
、復帰ばね２１先端にはワイヤー２２を設けてワイヤー
ガイド２３で支持する。このような構成においても前記
、第一実施例、第二実施例と同様の効果があり、またワ
イヤー２２はその自由飛行動作が復帰ばね２１でガイド
されたような形態となるためワイヤーガイド２３の摩耗
が少なく、低コストで印字品質の良い圧電式印字ヘッド
が得られる。These lever arm 4 and base 2 can be manufactured as one piece by punching, cutting, etching, etc.
In addition to metal, composite materials such as plastic and resin can also be used as long as they have spring properties. Further, in the present invention, the electrostrictive or piezoelectric element 1 is shown as a laminated one, but it can also be applied to a single plate element having a longitudinal effect or a transverse effect. Another embodiment is shown in FIG. FIG. 2 is a schematic perspective view of three piezoelectric print heads arranged side by side. In FIG. 2, an electrostrictive or piezoelectric element 1 is connected to a base 15 together with a lever arm 4 and a buckling spring 6. Also, the base 15 is the housing 1
A return spring 17 is fixed to the housing 16 and has a movable part 7 and a printing needle 8. The return spring 17 is made up of a plurality of integrated springs, is fixed to the housing 16, and is disposed in front of the buckling spring 6. In this configuration, a dot impact line printer can be constructed by arranging multiple heads in a horizontal row, and by integrating multiple springs, the printing needle 8, which is important for printing quality, can be configured.
This has the effect of ensuring sufficient pitch accuracy. Since the movable part 7 only needs to be placed on the surface of the buckling spring 6, the base 15
Even if the accuracy of the arrangement of B and J is poor, the accuracy of the return spring 17 allows the printing needles 8 to obtain an accurate arrangement pitch, making it possible to obtain a good head for IJ child products, and easy to assemble. This has the effect of reducing manufacturing costs. FIG. 3 shows a sectional view of the present invention applied to a serial printer head as another embodiment. In FIG. 3, on the cylindrical base 18,
The electrostrictive or piezoelectric element 1 is connected to the lever 7-mem 21 via the displacement transmitting means 19, and the base 18
A buckling spring 6 is connected between the lever arm 20 and the lever arm 20. on the other hand,
A return spring 21 having a movable part 7 is also fixed on the base 18, and a wire 22 is provided at the tip of the return spring 21 and supported by a wire guide 23. This configuration also has the same effects as the first and second embodiments, and since the free flight motion of the wire 22 is guided by the return spring 21, the wire guide 23 is A piezoelectric print head with low wear, low cost, and high print quality can be obtained.

（発明の効果） 本発明によれば、レバーアームと自らの変形で変位拡大
する座屈ばねを用いることにより小型で大きな変位量が
得られ、かつ印字動作も安定でドツト配列ピッチが正確
ができるため良質の印字品質が得られる上、組立調整が
容易であるため低コストの圧電式印字ヘッドが得られる
。(Effects of the Invention) According to the present invention, by using a lever arm and a buckling spring that expands displacement by its own deformation, a large amount of displacement can be obtained with a small size, and the printing operation is stable and the dot arrangement pitch can be accurate. Therefore, good printing quality can be obtained, and since assembly and adjustment are easy, a low-cost piezoelectric print head can be obtained.

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

第１−ａ図は本発明の一実施例を示す模式的な斜視図、
第１−ｂ図は第１−ａ図の動作、使用形態を説明するた
めの側面図、第２図は本発明の他の一実施例を示す模式
的な斜視図、第３図は本発明の他の一実施例を示す断面
図、第４図は従来の一実施例を示す斜視図を示す。 図中各記号はそれぞれ次のものを示す。 １・・・電歪あるいは圧電素子、２・・・ベース、３・
・・変位伝達手段、４・・・レバーアーム、５・・・変
位伝達手段、６・・・座屈ばね、７・・・可動部、８・
・・印字針、９・・・復帰ばね、１０・・・伸び、１１
・・・プラテン、１２・・・印字用紙、１３・・・イン
クリボン、１４・・・バ、クスト、プ、１５・・・ベー
ス、１６・・・ハウジング、１７・・・復帰ばね、１８
・・・円筒形ベース、１９・・・変位伝達手段、２０・
・・レバーアーム、２１・・・復帰ばね、２２・・・ワ
イヤー、２３・・・ワイヤーガイド、２４・・・圧電体
、２５・２６・・・結合部材、２７・・・可動部材、２
８−０．ワイヤ、２９・・・係留部、３０・・・ガイド
孔、３１・・・コイルばね （ａン （ｂ） 亭　　２　　図 千　　４　　図Figure 1-a is a schematic perspective view showing an embodiment of the present invention;
FIG. 1-b is a side view for explaining the operation and usage pattern of FIG. 1-a, FIG. 2 is a schematic perspective view showing another embodiment of the present invention, and FIG. FIG. 4 is a sectional view showing another embodiment, and FIG. 4 is a perspective view showing a conventional embodiment. Each symbol in the figure indicates the following. 1... Electrostrictive or piezoelectric element, 2... Base, 3...
...Displacement transmission means, 4. Lever arm, 5. Displacement transmission means, 6. Buckling spring, 7. Movable part, 8.
...Printing needle, 9...Return spring, 10...Extension, 11
. . . Platen, 12 . . . Print paper, 13 . . . Ink ribbon, 14 .
... Cylindrical base, 19... Displacement transmission means, 20.
... Lever arm, 21 ... Return spring, 22 ... Wire, 23 ... Wire guide, 24 ... Piezoelectric body, 25, 26 ... Connection member, 27 ... Movable member, 2
8-0. Wire, 29...Mooring part, 30...Guide hole, 31...Coil spring (a)

Claims (1)

【特許請求の範囲】[Claims] 電歪あるいは圧電素子の伸縮動作により印字針を自由飛
行させ印字を行なう圧電式印字ヘッドにおいて、前記電
歪あるいは圧電素子の動作を伝達するためのレバーアー
ムと、そのレバーアームの先端から軸方向に変位が伝達
されるよう接続される座屈ばねと、その座屈ばねから力
を受けて印字方向に自由飛行するように配置された可動
部と、その可動部を復帰するための復帰ばねとから構成
され、可動部には印字針が設けられていることを特徴と
する圧電式印字ヘッド。In a piezoelectric print head that prints by making a printing needle fly freely through the expansion and contraction movement of an electrostrictive or piezoelectric element, there is a lever arm for transmitting the movement of the electrostrictive or piezoelectric element, and a lever arm extending in the axial direction from the tip of the lever arm. A buckling spring connected to transmit displacement, a movable part arranged to receive force from the buckling spring and flying freely in the printing direction, and a return spring for returning the movable part. A piezoelectric print head characterized in that the movable part is provided with a printing needle.