JPH0450194B2 - - Google Patents
Info
- Publication number
- JPH0450194B2 JPH0450194B2 JP62028534A JP2853487A JPH0450194B2 JP H0450194 B2 JPH0450194 B2 JP H0450194B2 JP 62028534 A JP62028534 A JP 62028534A JP 2853487 A JP2853487 A JP 2853487A JP H0450194 B2 JPH0450194 B2 JP H0450194B2
- Authority
- JP
- Japan
- Prior art keywords
- hinge
- piezoelectric element
- arm
- print head
- hinges
- 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
Links
- 238000007639 printing Methods 0.000 claims description 19
- 230000008602 contraction Effects 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 description 19
- 230000008878 coupling Effects 0.000 description 12
- 238000010168 coupling process Methods 0.000 description 12
- 238000005859 coupling reaction Methods 0.000 description 12
- 230000003321 amplification Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000020169 heat generation Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process 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
- B41J2/295—Actuators for print wires using piezoelectric elements
Landscapes
- Impact Printers (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、圧電素子を駆動源とするプリンタ印
字ヘツドに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printer print head using a piezoelectric element as a driving source.
従来、プリンタ印字ヘツドの駆動源としては、
電磁型のアクチユエータが広く用いられてきた。
この電磁型のアクチユエータは、コイルに電流を
流すことにより磁界を発生しその磁力を利用して
可動部材を駆動するため、銅損や鉄損が生じ、大
きな入力エネルギを必要とするばかりでなく、発
熱や磁気干渉などの問題点があつた。
Traditionally, the drive source for printer print heads is
Electromagnetic type actuators have been widely used.
This electromagnetic actuator generates a magnetic field by passing a current through a coil, and uses the magnetic force to drive a movable member, which not only causes copper loss and iron loss, but also requires large input energy. There were problems such as heat generation and magnetic interference.
そこで近年、電気・機械エネルギ変換効率が高
く、低電力、低発熱で磁気干渉のない圧電素子を
駆動源とする印字ヘツドが考えられている。たと
えば特願昭58−163668号明細書には第５図ａ，ｂ
に示すような印字ハンマが記載されている。 Therefore, in recent years, print heads using piezoelectric elements as drive sources, which have high electrical/mechanical energy conversion efficiency, low power consumption, low heat generation, and no magnetic interference, have been considered. For example, in the specification of Japanese Patent Application No. 58-163668, figures 5 a and b are shown.
A printing hammer as shown in is described.
第５図において印字ヘツドは、一端が固定部材
５０に結合された圧電素子５１と、端部に近接し
て２個の第１、第２の結合部５２，５３を有しそ
の一方５２は固定部材５０に結合し、他方５３は
圧電素子５１の他の一端に結合された第１のアー
ム５４と、近接した２個の第３、第４の結合部５
５，５６を有しその一方５５は第１のアーム５４
の他端に結合し他方５６は固定部材５６に結合し
た第２のアーム５７と、第２のアーム５７の他端
に固着された印字ワイヤ５８を備えている。 In FIG. 5, the print head has a piezoelectric element 51 coupled at one end to a fixed member 50, and two first and second coupling parts 52, 53 adjacent to the end, one of which 52 is fixed. A first arm 54 coupled to the member 50 and the other end 53 coupled to the other end of the piezoelectric element 51, and two adjacent third and fourth coupling parts 5.
5, 56, one of which 55 is a first arm 54
The other end 56 has a second arm 57 coupled to the fixing member 56 and a printing wire 58 fixed to the other end of the second arm 57 .
第５図ａは圧電素子５１に電圧が印加されてい
ない場合であり、圧電素子５１に電圧が印加され
ると第５図ｂに示すように、圧電素子５１は矢印
Ａ方向に伸び、第１のアーム５４は押されて第１
の結合部５２付近を回転中心としてθ1回転し、圧
電素子５１の変位はてこの原理により拡大されて
第３の結合部５５に伝達される。第２のアーム５
７は、第３の結合部５５より引張られ第４の結合
部５６付近を回転中心としてθ2回転し、第３の結
合部５５の変位はてこの原理により拡大されて印
字ワイヤ５８に伝達される。このように圧電素子
５１の変位は、第１および第２のアーム５４，５
７の回転運動により拡大されて印字ワイヤ５８に
伝達され、印字動作を行つている。 FIG. 5a shows a case where no voltage is applied to the piezoelectric element 51, and when a voltage is applied to the piezoelectric element 51, as shown in FIG. 5b, the piezoelectric element 51 extends in the direction of arrow A, and the first arm 54 is pushed to the first
The displacement of the piezoelectric element 51 is magnified by the lever principle and transmitted to the third coupling part 55. second arm 5
7 is pulled from the third coupling portion 55 and rotates by θ 2 around the fourth coupling portion 56, and the displacement of the third coupling portion 55 is magnified by the lever principle and transmitted to the printing wire 58. Ru. In this way, the displacement of the piezoelectric element 51 is controlled by the first and second arms 54, 5.
7 is enlarged and transmitted to the printing wire 58, thereby performing a printing operation.
〔発明が解決しようとする問題点〕
上述した従来の圧電素子による印字ヘツドは、
圧電素子を駆動源として使用していることから、
低電力・低発熱で磁気干渉がないという特徴を持
つている。しかし圧電素子の変位を拡大する変位
拡大機構が、２個のアームと４個の結合部からな
るてこを二段直列に接続した二段増幅型変位拡大
機構になつているため、構造が複雑になり製造コ
ストが高いという問題点がある。また、変位拡大
機構は、てこの原理を応用しているため、変位は
拡大するが力は縮小する性質を持つている。した
がつて、第１のアームと第１、第２の結合部より
構成される一段目の変位拡大機構の出力としては
大きな力を得ることは難しく、第３、第４の結合
部の曲げ剛性は第１、第２の結合部の曲げ剛性よ
りも小さくする必要がある。その結果、第２のア
ームと第３、第４の結合部より構成される二段目
の変位拡大機構の固有振動数は低くなり結局印字
ヘツドの印字動作の応答周波数を高くすることが
できないという問題点もある。本発明の目的は、
構造が単純で安価な、かつ高速の印字ヘツドを提
供することにある。[Problems to be solved by the invention] The above-mentioned conventional printing head using a piezoelectric element has the following problems:
Since a piezoelectric element is used as a driving source,
It is characterized by low power consumption, low heat generation, and no magnetic interference. However, the displacement magnification mechanism that magnifies the displacement of the piezoelectric element is a two-stage amplification type displacement magnification mechanism in which levers consisting of two arms and four coupling parts are connected in two stages in series, resulting in a complicated structure. However, there is a problem in that the manufacturing cost is high. Furthermore, since the displacement magnification mechanism applies the principle of a lever, it has the property of expanding displacement but decreasing force. Therefore, it is difficult to obtain a large force as an output from the first stage displacement magnifying mechanism consisting of the first arm and the first and second joints, and the bending rigidity of the third and fourth joints needs to be smaller than the bending rigidity of the first and second joints. As a result, the natural frequency of the second-stage displacement magnification mechanism, which is composed of the second arm and the third and fourth coupling parts, becomes low, making it impossible to increase the response frequency of the printing operation of the print head. There are also problems. The purpose of the present invention is to
The object of the present invention is to provide a print head with a simple structure, low cost, and high speed.
本発明の印字ヘツドは固定部材に固定された薄
板状の第１のヒンジを一端に有する圧電素子と、
端部に薄板状であつて前記圧電素子の他端に結合
した第２のヒンジとそれを挟んだ幅方向の両側に
あつて、ヒンジの厚さ方向に前記第２のヒンジと
は段差をつけて同じ高さに配置された薄板状の第
３、第４のヒンジを有し、前記第２のヒンジを前
記圧電素子の他端に結合し、前記第３、第４のヒ
ンジを前記固定部材に結合してなる前記圧電素子
の伸縮方向とは異ある方向に伸びたアームと、前
記アームの他端に結合され前記圧電素子の伸縮方
向と同方向に伸びた印字ワイヤとから構成されて
いる。
The print head of the present invention includes a piezoelectric element having a thin plate-like first hinge at one end fixed to a fixing member;
A second hinge having a thin plate shape at an end and connected to the other end of the piezoelectric element, and a second hinge on both sides of the second hinge in the width direction sandwiching the second hinge, with a step difference from the second hinge in the thickness direction of the hinge. the second hinge is connected to the other end of the piezoelectric element, and the third and fourth hinges are connected to the fixing member. and a printing wire connected to the other end of the arm and extending in the same direction as the direction of expansion and contraction of the piezoelectric element. .
本発明の印字ヘツドにおいては、第２のヒンジ
を挟んで幅方向の両側に、厚さ方向に第１のヒン
ジとは段差をつけて第３、第４のヒンジを配置し
ているため、第２のヒンジの軸と第３、第４のヒ
ンジの軸との間の距離を、従来のように各ヒンジ
を平面的に配置した場合と比較して、短くでき
る。その結果、変位拡大機構の変位拡大率を大き
くできアームを１個しか用いない一段増幅でもつ
て、印字動作に必要なストロークを得ることがで
きる。
In the print head of the present invention, the third and fourth hinges are disposed on both sides of the second hinge in the width direction with a step difference from the first hinge in the thickness direction. The distance between the axis of the second hinge and the axes of the third and fourth hinges can be shortened compared to the conventional case where each hinge is arranged in a plane. As a result, the displacement magnification rate of the displacement magnification mechanism can be increased, and even with one-stage amplification using only one arm, the stroke necessary for the printing operation can be obtained.
したがつて、従来のようにアームを２個使用し
た二段増幅の場合と比較して、アームの等価質量
は小さくなりヒンジ部の等価曲げ剛性も大きくな
るため変位拡大機構の固有振動数は高くなり、印
字ヘツドの印字動作の応答周波数が高くなり高速
の印字ヘツドとなる。 Therefore, compared to the conventional two-stage amplification case using two arms, the equivalent mass of the arm is smaller and the equivalent bending rigidity of the hinge part is also larger, so the natural frequency of the displacement amplification mechanism is higher. This increases the response frequency of the printing operation of the print head, resulting in a high-speed print head.
また、変位拡大機構も１個のアームと３個のヒ
ンジのみで構成しているため構造が単純で安価な
印字ヘツドとなる。 Furthermore, since the displacement magnification mechanism is composed of only one arm and three hinges, the print head has a simple structure and is inexpensive.
次に本発明について図面を参照して詳細に説明
する。
Next, the present invention will be explained in detail with reference to the drawings.
第１図は本発明の一実施例を示す斜視図、第２
図は第１図の実施例のヒンジの配置を示す斜視
図、第３図は第１図の実施例の動作図を示す斜視
図、第４図ａ，ｂは本発明の他の実施例を示す正
面図と側面図である。 Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a perspective view showing the arrangement of the hinge of the embodiment shown in Fig. 1, Fig. 3 is a perspective view showing the operation diagram of the embodiment shown in Fig. 1, and Figs. 4a and 4b show other embodiments of the present invention. FIG. 2 is a front view and a side view.
第１図において、アーム１はその端部１ａに薄
板状の第２のヒンジ２とそれを挟んで幅方向の両
側に薄板状の第３、第４のヒンジ３，４を有し、
第２のヒンジ２は圧電素子５の伸縮方向の一端５
ａに結合され、第３、第４のヒンジ３，４は固定
部材６に結合され、圧電素子５の伸縮方向の他端
５ｂは固定部材６に結合された薄板状の第１のヒ
ンジ８に結合されている。またアーム１圧電素子
５の伸縮方向とは直角方向に伸びており、アーム
１の他端１ｂに圧電素子５の伸縮方向と同方向に
伸びている印字ワイヤ７が結合されている。 In FIG. 1, the arm 1 has a thin plate-shaped second hinge 2 at its end 1a, and thin plate-shaped third and fourth hinges 3 and 4 on both sides of the hinge in the width direction,
The second hinge 2 is one end 5 of the piezoelectric element 5 in the expansion and contraction direction.
a, the third and fourth hinges 3 and 4 are connected to a fixing member 6, and the other end 5b of the piezoelectric element 5 in the expansion/contraction direction is connected to a thin plate-shaped first hinge 8 coupled to the fixing member 6. combined. Further, the arm 1 extends in a direction perpendicular to the direction of expansion and contraction of the piezoelectric element 5, and a printing wire 7 that extends in the same direction as the direction of expansion and contraction of the piezoelectric element 5 is coupled to the other end 1b of the arm 1.
第２図は第１図の実施例の第２、第３、第４の
ヒンジ２，３，４の配置を示す斜視図であり、第
３、第４のヒンジ３，４は、第２のヒンジ２を挟
んでその幅方向の両側に、その厚さ方向に第２の
ヒンジ２とは段差をつけて同じ高さに配置されて
いる。 FIG. 2 is a perspective view showing the arrangement of the second, third, and fourth hinges 2, 3, and 4 of the embodiment shown in FIG. They are arranged on both sides of the hinge 2 in the width direction and at the same height as the second hinge 2 with a step difference in the thickness direction.
このような構成の印字ヘツドにおいて、圧電素
子５に電圧を印加すると、第３図に示すように、
圧電素子５は矢印Ａ方向に伸張動作を起こし、第
２のヒンジ２に力を伝える。すると、第３、第４
のヒンジ３，４は第２のヒンジ２とは段差をつけ
てあるため、薄板状の第１、第２、第３、第４の
ヒンジ８，２，３，４は曲げ変形を起こし、アー
ム１は矢印Ｂの方向に回転運動を起こす。その結
果アーム１の先端に結合された印字ワイヤ７に
は、圧電素子５の変位が拡大されて伝達され、矢
印Ｃの方向に動作し、印字動作を行う。 In the print head having such a configuration, when a voltage is applied to the piezoelectric element 5, as shown in FIG.
The piezoelectric element 5 causes a stretching motion in the direction of arrow A and transmits force to the second hinge 2. Then, the third and fourth
Since the hinges 3 and 4 are stepped from the second hinge 2, the thin plate-shaped first, second, third, and fourth hinges 8, 2, 3, and 4 undergo bending deformation, and the arm 1 causes rotational movement in the direction of arrow B. As a result, the displacement of the piezoelectric element 5 is transmitted in an enlarged manner to the printing wire 7 connected to the tip of the arm 1, which moves in the direction of arrow C to perform a printing operation.
このような本発明の印字ヘツドにおいては、第
３、第４のヒンジ３，４を第２のヒンジ２を挟ん
で幅方向の両側に、その厚さ方向に第２のヒンジ
２とは段差をつけて配置しているため、第２のヒ
ンジ２の軸と第３、第４のヒンジ３，４の軸との
間の距離を、従来のように各ヒンジを平面的に配
置した場合と比較して短くできる。その結果、変
位拡大機構の変位拡大率を大きくでき、アームを
１個しか用いなくても、印字動作に必要なストロ
ークを得ることができる。したがつて、従来のよ
うにアームを２個使用した場合と比較して、アー
ムの等価質量は小さくなるため変位拡大機構の固
有振動数は高くなり、印字ヘツドの印字動作の応
答周波数が高くなり高速の印字ヘツドとなる。ま
た、変位拡大機構も１個のアームと４個のヒンジ
のみで構成しているため構造が単純で安価な印字
ヘツドとなる。 In such a print head of the present invention, the third and fourth hinges 3 and 4 are placed on both sides of the second hinge 2 in the width direction, and there is a difference in level from the second hinge 2 in the thickness direction. Since the hinges are arranged side by side, the distance between the axis of the second hinge 2 and the axes of the third and fourth hinges 3 and 4 can be compared with the case where each hinge is arranged in a plane as in the conventional case. You can shorten it by doing this. As a result, the displacement magnification rate of the displacement magnification mechanism can be increased, and the stroke necessary for printing operation can be obtained even if only one arm is used. Therefore, compared to the conventional case where two arms are used, the equivalent mass of the arm is smaller, the natural frequency of the displacement magnification mechanism is higher, and the response frequency of the printing operation of the print head is higher. It becomes a high-speed print head. In addition, since the displacement magnification mechanism is composed of only one arm and four hinges, the print head has a simple structure and is inexpensive.
第４図ａ，ｂは、第１図に示した本発明の印字
ヘツドを放射状に24個配置したシリアルプリンタ
用印字ヘツドの一実施例を示す正面図と側面の断
面図である。 4a and 4b are a front view and a side sectional view showing an embodiment of a print head for a serial printer in which 24 print heads of the present invention shown in FIG. 1 are arranged radially.
第４図において、第１図に示した印字ヘツドと
同じ構造の印字ヘツド４９−１，４９−２，４９
−３……をそれぞれの印字ワイヤ４７−１，４７
−２，４７−３……がほぼ中心になるように放射
状に24個配置してある。 In FIG. 4, print heads 49-1, 49-2, 49 having the same structure as the print head shown in FIG.
-3... for each printing wire 47-1, 47
-2, 47-3...24 are arranged radially so that they are approximately at the center.
このような構成の印字ヘツドにおいても、前述
の印字ヘツドと同様の動作を行い、同様の効果を
発揮する。 A print head having such a configuration also operates in the same way as the print head described above, and exhibits the same effects.
本発明によれば、構造が単純で安価でしかも高
速の印字ヘツドが得られる。
According to the present invention, a print head with a simple structure, low cost, and high speed can be obtained.
第１図は本発明の一実施例を示す斜視図、第２
図は第１図の実施例のヒンジの配置を示す斜視
図、第３図は第１図の実施例の動作図を示す斜視
図、第４図ａ，ｂは本発明の他の実施例を示す正
面図と側面図、第５図ａ，ｂは従来の実施例を示
す図である。
１，４１−１，４１−２，４１−３……アー
ム、２……第２のヒンジ、３……第３のヒンジ、
４……第４のヒンジ、５，４５……圧電素子、６
……固定部材、７，４７−１，４７−２，４７−
３……印字ワイヤ、８……第１のヒンジ、４９−
１，４９−２，４９−３……印字ヘツド、５０…
…固定部材、５１……圧電素子、５２……第１の
結合部、５３……第２の結合部、５４……第１の
アーム、５５……第３の結合部、５６……第４の
結合部、５７……第２のアーム、５８……印字ワ
イヤ。
Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a perspective view showing the arrangement of the hinge of the embodiment shown in Fig. 1, Fig. 3 is a perspective view showing the operation diagram of the embodiment shown in Fig. 1, and Figs. 4a and 4b show other embodiments of the present invention. The front view and side view shown in FIGS. 5A and 5B are views showing a conventional embodiment. 1, 41-1, 41-2, 41-3...Arm, 2...Second hinge, 3...Third hinge,
4... Fourth hinge, 5, 45... Piezoelectric element, 6
...Fixing member, 7,47-1,47-2,47-
3... Printing wire, 8... First hinge, 49-
1,49-2,49-3...Print head, 50...
...Fixing member, 51...Piezoelectric element, 52...First coupling part, 53...Second coupling part, 54...First arm, 55...Third coupling part, 56...Fourth coupling part 57...second arm, 58...printing wire.
Claims (1)
を一端に有する圧電素子と、端部に薄板状であつ
て前記圧電素子の他端に結合した第２のヒンジと
それを挟んで幅方向の両側にあつて、ヒンジの厚
さ方向に前記第２のヒンジとは段差をつけて同じ
高さに配置された薄板状の第３、第４のヒンジを
有し、前記第２のヒンジを前記圧電素子の他端に
結合し、前記第３、第４のヒンジを前記固定部材
に結合してなる前記圧電素子の伸縮方向とは異な
る方向に伸びたアームと、前記アームの他端に結
合され前記圧電素子の伸縮方向と同方向に伸びた
印字ワイヤとから構成されていることを特徴とす
る印字ヘツド。1 A piezoelectric element having a thin plate-shaped first hinge fixed to a fixed member at one end, a thin plate-shaped second hinge at one end connected to the other end of the piezoelectric element, and a piezoelectric element sandwiching the piezoelectric element in the width direction. on both sides of the hinge, the hinge has third and fourth hinges in the form of thin plates arranged at the same height with a step difference in the thickness direction of the hinge, and the second hinge an arm coupled to the other end of the piezoelectric element and extending in a direction different from the expansion/contraction direction of the piezoelectric element, the third and fourth hinges being coupled to the fixing member; and an arm coupled to the other end of the arm; and a printing wire extending in the same direction as the direction of expansion and contraction of the piezoelectric element.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62028534A JPS63194955A (en) | 1987-02-09 | 1987-02-09 | Printing head |
| US07/153,371 US4886382A (en) | 1987-02-09 | 1988-02-08 | Printing hammer comprising two hinge parts coupling an arm to a base member on both sides of a hinge coupling the arm to a piezoelectric actuator |
| EP88101877A EP0285766B1 (en) | 1987-02-09 | 1988-02-09 | Printing hammer provided with a piezoelectric actuator |
| DE8888101877T DE3870298D1 (en) | 1987-02-09 | 1988-02-09 | PRINT HAMMER WITH PIEZOELECTRIC ACTUATOR. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62028534A JPS63194955A (en) | 1987-02-09 | 1987-02-09 | Printing head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63194955A JPS63194955A (en) | 1988-08-12 |
| JPH0450194B2 true JPH0450194B2 (en) | 1992-08-13 |
Family
ID=12251333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62028534A Granted JPS63194955A (en) | 1987-02-09 | 1987-02-09 | Printing head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63194955A (en) |
-
1987
- 1987-02-09 JP JP62028534A patent/JPS63194955A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63194955A (en) | 1988-08-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |