JPH0688419B2 - Print head - Google Patents
Print headInfo
- Publication number
- JPH0688419B2 JPH0688419B2 JP28389888A JP28389888A JPH0688419B2 JP H0688419 B2 JPH0688419 B2 JP H0688419B2 JP 28389888 A JP28389888 A JP 28389888A JP 28389888 A JP28389888 A JP 28389888A JP H0688419 B2 JPH0688419 B2 JP H0688419B2
- Authority
- JP
- Japan
- Prior art keywords
- electrostrictive element
- printing
- print head
- elastic member
- movable member
- 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.)
- Expired - Fee Related
Links
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
- B41J2/295—Actuators for print wires using piezoelectric elements
Landscapes
- Impact Printers (AREA)
Description
【発明の詳細な説明】 〔概要〕 電歪素子を利用したワイヤドットインパクトプリンタ用
印字ヘッドに関し、 高速印字が可能でしかも信頼度の高い印字ヘッドを提供
することを目的とし、 ほぼ平行に配設されて長手方向に延びる第1,第２の弾性
部材のそれぞれの一端を、印字用部材を備えた可動部材
に固定し、前記第１の弾性部材の他端を固定するととも
に、前記第２の弾性部材の他端を電歪素子の一端に接続
して成り、前記電歪素子により前記第２の弾性部材を長
手方向に圧縮することによって前記可動部材に印字動作
を行わせる印字ヘッドにおいて、前記可動部材の印字動
作時に前記第２の弾性部材の他端に働く反作用による前
記電歪素子の一端の動き（電歪素子の変位方向と垂直方
向の成分）を拘束する拘束部材を設けた構成とする。DETAILED DESCRIPTION OF THE INVENTION [Outline] Regarding a print head for a wire dot impact printer using an electrostrictive element, a print head capable of high-speed printing and having high reliability is provided, and the print heads are arranged substantially parallel to each other. One end of each of the first and second elastic members that are extended in the longitudinal direction is fixed to a movable member having a printing member, the other end of the first elastic member is fixed, and the second elastic member is fixed. A printhead, comprising the other end of an elastic member connected to one end of an electrostrictive element, wherein the electrostrictive element compresses the second elastic member in a longitudinal direction to cause the movable member to perform a printing operation. And a restraint member for restraining movement of one end of the electrostrictive element (a component in a direction perpendicular to the displacement direction of the electrostrictive element) due to a reaction acting on the other end of the second elastic member during the printing operation of the movable member. To do.
本発明は電歪素子を利用したインパクト式ワイヤドット
プリンタ用印字ヘッドに関する。The present invention relates to a print head for an impact type wire dot printer that uses an electrostrictive element.
近時、ワイヤドットプリンタの高速化要求に伴い、電磁
方式に代わって、電歪素子を用いた高速作動印字ヘッド
が求められている。この種の電歪素子としては、例えば
1984年３月12日発行の日経メカニカル，第92頁に示され
るように、片側の表面に内部電極となる金属ペースト膜
が形成された複数枚の圧電セラミックスのグリーンシー
トを積層し、これを焼成して得られたものが使用され
る。Recently, with the demand for higher speed of the wire dot printer, a high-speed operation print head using an electrostrictive element has been required instead of the electromagnetic system. As this kind of electrostrictive element, for example,
As shown on page 92 of Nikkei Mechanical, published on March 12, 1984, a plurality of green sheets of piezoelectric ceramics, each of which has a metal paste film as an internal electrode formed on one surface, are laminated and fired. The one obtained in this way is used.
第２図は従来の電歪素子を用いた印字ヘッドの構造概要
説明図で、図中、１はフレーム、２は電歪素子、３は可
動部材（アマチュア）、４及び５は棒状の第１及び第２
の弾性部材である。FIG. 2 is a schematic explanatory view of the structure of a conventional print head using an electrostrictive element, in which 1 is a frame, 2 is an electrostrictive element, 3 is a movable member (amateur), and 4 and 5 are rod-shaped first And the second
Is an elastic member.
電歪素子２は、基部がフレーム１に固定され、通電され
た充電時に上方に変位する。The electrostrictive element 2 has a base portion fixed to the frame 1 and is displaced upward when being charged with electricity.
可動部材３は、電歪素子２の上方に基部を対向させて配
置され、先端に印字用部材（ワイヤ）６を備えている。The movable member 3 is arranged above the electrostrictive element 2 with the bases facing each other, and has a printing member (wire) 6 at the tip.
第１の弾性部材４は、上下方向に延びて配設され、上端
（一端）が可動部材３の基部に、下端（他端）がフレー
ム１にそれぞれ固定されている。第２の弾性部材５は、
第１の弾性部材４とほぼ平行に配設され、上端（一端）
が可動部材３の基部に、下端（他端）が電歪素子２の上
端（一端）の接続部材７にそれぞれ固定されている。The first elastic member 4 is arranged so as to extend in the vertical direction, and has an upper end (one end) fixed to the base of the movable member 3 and a lower end (other end) fixed to the frame 1. The second elastic member 5 is
The upper end (one end) is arranged substantially parallel to the first elastic member 4.
Is fixed to the base of the movable member 3, and the lower end (the other end) thereof is fixed to the connecting member 7 of the upper end (one end) of the electrostrictive element 2.
この印字ヘッドの作用は次の通りである。The operation of this print head is as follows.
電歪素子２が放電状態にある非印字時には、可動部材３
及び各弾性部材4,5は実線の状態に位置している。During non-printing when the electrostrictive element 2 is in a discharged state, the movable member 3
And each elastic member 4 and 5 is located in the state of a solid line.
印字時には通電より電歪素子２を充電する。これによ
り、電歪素子２の上端の接続部材７は上方に所定量移動
し、第２の弾性部材５には圧縮力が作用する。その結
果、各弾性部材4,5はバイメタル効果によって点線のよ
うに変形し、可動部材３は反時計方向に点線の位置まで
回動する。そして、この可動部材３の印字動作（回動）
により、該可動部材３の先端には拡大変位が付与され、
この拡大変位により印字用部材６による印字が行われ
る。印字完了直前に電歪素子２に対する通電が停止され
て電歪素子２の放電が開始され、印字動作を完了した可
動部材３は、放電を完了した電歪素子２及び各弾性部材
4,5とともにもとの状態に復帰する。そして、電歪素子
２の充，放電を繰り返すことにより、所定の印字が行わ
れる。During printing, the electrostrictive element 2 is charged by energization. As a result, the connecting member 7 at the upper end of the electrostrictive element 2 moves upward by a predetermined amount, and a compressive force acts on the second elastic member 5. As a result, each elastic member 4, 5 is deformed by the bimetal effect as shown by the dotted line, and the movable member 3 is rotated counterclockwise to the position shown by the dotted line. Then, the printing operation (rotation) of the movable member 3
As a result, an enlarged displacement is applied to the tip of the movable member 3,
Printing by the printing member 6 is performed by this enlarged displacement. Immediately before the completion of printing, energization of the electrostrictive element 2 is stopped and discharge of the electrostrictive element 2 is started.
It returns to the original state with 4,5. Then, by repeating charging and discharging of the electrostrictive element 2, predetermined printing is performed.
しかし、上述の従来構造では、印字動作時に各弾性部材
4,5の撓むＡ方向と逆のＢ方向の反作用が第２の弾性部
材５の他端に働き、接続部材７にＢ方向の力が加わる。
このため、電歪素子２には曲げモーメントが働き、該電
歪素子２の左側には引張応力が発生する。電歪素子２は
特性上引張強度がきわめて低いために、上記引張応力に
より電歪素子２は、高速で繰り返し駆動した場合破損し
てしまい、信頼度が低下する。However, in the above-described conventional structure, each elastic member is used during the printing operation.
A reaction in the B direction opposite to the bending A direction of 4,5 acts on the other end of the second elastic member 5, and a force in the B direction is applied to the connecting member 7.
Therefore, a bending moment acts on the electrostrictive element 2, and a tensile stress is generated on the left side of the electrostrictive element 2. Since the electrostrictive element 2 has extremely low tensile strength as a characteristic, the electrostrictive element 2 is damaged by the tensile stress when repeatedly driven at high speed, and the reliability is lowered.
本発明は、高速印字が可能でしかも信頼度の高い印字ヘ
ッドを提供することを目的とするものである。It is an object of the present invention to provide a print head capable of high-speed printing and having high reliability.
上述の目的を達成するために、本発明では、ほぼ平行に
配設されて長手方向に延びる第1,第２の弾性部材のそれ
ぞれの一端を、印字用部材を備えた可動部材に固定し、
前記第１の弾性部材の他端を固定するとともに、前記第
２の弾性部材の他端を電歪素子の一端に接続して成り、
前記電歪素子により前記第２の弾性部材を長手方向に圧
縮することによって前記可動部材を回動させて印字を行
わせる印字ヘッドにおいて、前記可動部材の印字動作時
に前記第２の弾性部材の他端に生じる反作用による前記
電歪素子の一端の動きを拘束する拘束部材を設けた構成
とする。In order to achieve the above object, in the present invention, one end of each of the first and second elastic members arranged substantially parallel and extending in the longitudinal direction is fixed to a movable member provided with a printing member,
While fixing the other end of the first elastic member, the other end of the second elastic member is connected to one end of the electrostrictive element,
A print head for rotating the movable member to perform printing by compressing the second elastic member in the longitudinal direction by the electrostrictive element, in addition to the second elastic member during the printing operation of the movable member. A restraint member that restrains the movement of one end of the electrostrictive element due to the reaction generated at the end is provided.
この印字ヘッドによる印字は、従来と同様に電歪素子の
充，放電を繰り返し、充電時における可動部材の印字動
作により行われる。但し、本発明では、可動部材の印字
動作時に第２の弾性部材の他端に働く反作用による電歪
素子の一端の動きが拘束部材により拘束される。The printing by the print head is performed by the charging / discharging operation of the electrostrictive element as in the conventional case, and the printing operation of the movable member during charging. However, in the present invention, the movement of one end of the electrostrictive element due to the reaction acting on the other end of the second elastic member during the printing operation of the movable member is restrained by the restraining member.
従って、印字動作時に電歪素子に発生する引張応力は減
少する。その結果、高速印字を連続して行っても電歪素
子が破損することはなくなり、信頼性は向上する。Therefore, the tensile stress generated in the electrostrictive element during the printing operation is reduced. As a result, even if high-speed printing is continuously performed, the electrostrictive element will not be damaged, and the reliability will be improved.
以下、第１図に関連して本発明の実施例を説明する。 An embodiment of the present invention will be described below with reference to FIG.
第１図は本発明に係る電歪素子を用いた印字ヘッドの構
造概要説明図で、従来と同様の部材には同じ記号を用い
ている。FIG. 1 is a schematic explanatory view of the structure of a print head using an electrostrictive element according to the present invention, and the same symbols are used for the same members as in the prior art.
図中、11は左右方向に延びる線状の拘束部材で、該拘束
部材11の一端は接続部材７に、他端はフレーム１にそれ
ぞれ固定されている。In the figure, 11 is a linear restraint member extending in the left-right direction, and one end of the restraint member 11 is fixed to the connecting member 7 and the other end thereof is fixed to the frame 1.
この印字ヘッドによる印字は、従来と同様に電歪素子２
の充，放電を繰り返し、充電時における可動部材３の印
字動作により行われる。この印字動作時に第２の弾性部
材５の他端に働くＢ方向の反作用により電歪素子２の上
端の接続部材７が同方向に動こうとするが、この動きは
拘束部材11により拘束される。その結果、印字動作時に
電歪素子２に発生する引張応力は減少する。The printing by the print head is performed by the electrostrictive element 2 as in the conventional case.
The charging and discharging are repeated and the printing operation of the movable member 3 at the time of charging is performed. At the time of this printing operation, the connection member 7 at the upper end of the electrostrictive element 2 tries to move in the same direction due to the reaction in the B direction acting on the other end of the second elastic member 5, but this movement is restricted by the restriction member 11. . As a result, the tensile stress generated in the electrostrictive element 2 during the printing operation is reduced.
従って、高速印字を連続して行っても電歪素子２が破損
することはなくなり、信頼性は向上する。Therefore, even if high-speed printing is continuously performed, the electrostrictive element 2 is not damaged and reliability is improved.
以上述べたように、本発明によれば、高速印字が可能で
しかも信頼度の高い印字ヘッドを得ることができる。As described above, according to the present invention, it is possible to obtain a print head capable of high-speed printing and having high reliability.
第１図は本発明の実施例の電歪素子を用いた印字ヘッド
の構造概要説明図、 第２図は従来の電歪素子を用いた印字ヘッドの構造概要
説明図で、 図中、 ２は電歪素子、 ３は可動部材（アマチュア）、 ４は第１の弾性部材、 ５は第２の弾性部材、 ６は印字用部材（ワイヤ）、 ７は接続部材、 11は拘束部材である。FIG. 1 is a schematic explanatory view of the structure of a print head using an electrostrictive element according to an embodiment of the present invention, and FIG. 2 is a schematic explanatory view of the structure of a print head using a conventional electrostrictive element. In FIG. Electrostrictive element, 3 is a movable member (amateur), 4 is a first elastic member, 5 is a second elastic member, 6 is a printing member (wire), 7 is a connecting member, and 11 is a restraining member.
Claims (1)
1,第２の弾性部材（4,5）のそれぞれの一端を、印字用
部材（６）を備えた可動部材（３）に固定し、前記第１
の弾性部材（４）の他端を固定するとともに、前記第２
の弾性部材（５）の他端を電歪素子（２）の一端に接続
して成り、 前記電歪素子（２）により前記第２の弾性部材（５）を
長手方向に圧縮することによって前記可動部材（３）を
回動させて印字動作を行わせる印字ヘッドにおいて、 前記可動部材（３）の印字動作時に前記第２の弾性部材
（５）の他端に働く反作用による前記電歪素子（２）の
一端の動きを拘束する拘束部材（11）を設けたことを特
徴とする印字ヘッド。1. A first device which is disposed substantially in parallel and extends in a longitudinal direction.
One end of each of the first and second elastic members (4,5) is fixed to a movable member (3) having a printing member (6),
While fixing the other end of the elastic member (4) of the
The other end of the elastic member (5) is connected to one end of the electrostrictive element (2), and the second elastic member (5) is compressed in the longitudinal direction by the electrostrictive element (2). In a print head for rotating a movable member (3) to perform a printing operation, the electrostrictive element () due to a reaction acting on the other end of the second elastic member (5) during the printing operation of the movable member (3). A print head comprising a restraining member (11) for restraining movement of one end of 2).
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28389888A JPH0688419B2 (en) | 1988-11-11 | 1988-11-11 | Print head |
| CA000593534A CA1319295C (en) | 1988-03-18 | 1989-03-13 | Printing head of wire-dot impact printer |
| US07/323,833 US5005994A (en) | 1988-03-18 | 1989-03-15 | Printing head of wire-dot impact printer |
| EP89400747A EP0333595B1 (en) | 1988-03-18 | 1989-03-16 | Printing head of wire-dot impact printer |
| DE8989400747T DE68903515T2 (en) | 1988-03-18 | 1989-03-16 | PRINT HEAD OF A NEEDLE POINT PRINTER. |
| ES198989400747T ES2035593T3 (en) | 1988-03-18 | 1989-03-16 | PRINTER HEAD OF A PRINTER BY IMPACTS OF NEEDLES. |
| KR1019890003324A KR920000390B1 (en) | 1988-03-18 | 1989-03-17 | Printheads in Wire-Dot Impact Printers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28389888A JPH0688419B2 (en) | 1988-11-11 | 1988-11-11 | Print head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02130153A JPH02130153A (en) | 1990-05-18 |
| JPH0688419B2 true JPH0688419B2 (en) | 1994-11-09 |
Family
ID=17671614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28389888A Expired - Fee Related JPH0688419B2 (en) | 1988-03-18 | 1988-11-11 | Print head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0688419B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2797231B2 (en) * | 1992-05-08 | 1998-09-17 | 富士通株式会社 | Piezo print head |
-
1988
- 1988-11-11 JP JP28389888A patent/JPH0688419B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02130153A (en) | 1990-05-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |