JPH0376674B2 - - Google Patents
Info
- Publication number
- JPH0376674B2 JPH0376674B2 JP15361584A JP15361584A JPH0376674B2 JP H0376674 B2 JPH0376674 B2 JP H0376674B2 JP 15361584 A JP15361584 A JP 15361584A JP 15361584 A JP15361584 A JP 15361584A JP H0376674 B2 JPH0376674 B2 JP H0376674B2
- Authority
- JP
- Japan
- Prior art keywords
- hinge
- hinges
- plate
- piezoelectric element
- shaped
- 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
- 230000000694 effects Effects 0.000 claims description 5
- 238000005452 bending Methods 0.000 description 20
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003672 processing method 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】
本発明は印字エレメント、特に圧電セラミツク
の圧電縦効果を利用してドツト印字を行うための
印字エレメントに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing element, and particularly to a printing element for performing dot printing using the piezoelectric longitudinal effect of piezoelectric ceramic.
従来、圧電セラミツクが圧電縦効果により発生
する寸法の歪を印字用ワイヤへ拡大伝達して、ド
ツト印字を行う印字エレメントが提案されてい
る。 Conventionally, a printing element has been proposed in which a piezoelectric ceramic performs dot printing by enlarging and transmitting dimensional distortion caused by a piezoelectric longitudinal effect to a printing wire.
第１図は従来の印字エレメントを示す斜視図で
ある。Ｕ字形の金属のベース部材１の内底部に下
端を接着し固定してある柱状の圧電セラミツクの
圧電素子２が、印字動作の駆動源である。すなわ
ち、リード３から圧電素子２の両側面の電極へ駆
動電圧を印加すると、圧電素子２の長さが伸びて
破線矢印Ａで示す向きに寸法歪が発生する。この
寸法歪は、圧電素子２の上端を接着し固定した取
付部材４に接続している板状のヒンジ６および７
を介してそれぞれ、レバー１１および１２へ伝達
される。これに応して、レバー１１および１２は
それぞれ板状のヒンジ５および８の中央部を中心
とする回転運動をして、おのおの先端部に破線矢
印ＢおよびＣの向きの角変位を生ずる。（なお、
従来ヒンジ５ないし８の板厚は全て等して設定し
てある。）この二つの互いに逆向きの角変位は、
板状とヒンジ１３および１４を介してレバー１５
に伝達されて、レバー１５に回転運動を与え、こ
れによつて印字用のワイヤ１６が破線矢印Ｄの向
きに動き印字動作を行う。 FIG. 1 is a perspective view of a conventional printing element. A columnar piezoelectric ceramic element 2 whose lower end is bonded and fixed to the inner bottom of a U-shaped metal base member 1 is the driving source for the printing operation. That is, when a driving voltage is applied from the lead 3 to the electrodes on both side surfaces of the piezoelectric element 2, the length of the piezoelectric element 2 increases, and dimensional distortion occurs in the direction indicated by the broken line arrow A. This dimensional distortion is caused by the plate-shaped hinges 6 and 7 connected to the mounting member 4 to which the upper end of the piezoelectric element 2 is glued and fixed.
are transmitted to the levers 11 and 12, respectively. Correspondingly, the levers 11 and 12 rotate around the center of the plate-shaped hinges 5 and 8, respectively, causing angular displacements in the directions of dashed arrows B and C at their respective tips. (In addition,
Conventionally, the thicknesses of the hinges 5 to 8 are all set to be the same. ) These two mutually opposite angular displacements are
Lever 15 via plate and hinges 13 and 14
The rotational motion is transmitted to the lever 15, thereby causing the printing wire 16 to move in the direction of the dashed arrow D to perform a printing operation.
このような従来の印字エレメントでは、駆動時
に圧電素子２に曲げモーメントが作用して、圧電
素子２に折損破壊を生じ易いという欠点がある。
すなわち、駆動時のレバー１１および１２の回転
運動により、ヒンジ６および７には曲げモーメン
トが作用し、この曲げモーメントに伴つて生ずる
反力が圧電素子２に曲げモーメントを与える。こ
の圧電素子２に与えられる曲げモーメントが過大
であると、繰返し動作中に圧電素子２の折損破壊
を生じ易い。 Such a conventional printing element has a drawback in that a bending moment acts on the piezoelectric element 2 during driving, and the piezoelectric element 2 is likely to break and break.
That is, due to the rotational movement of the levers 11 and 12 during driving, a bending moment acts on the hinges 6 and 7, and a reaction force generated along with this bending moment applies a bending moment to the piezoelectric element 2. If the bending moment applied to the piezoelectric element 2 is excessive, the piezoelectric element 2 is likely to break or break during repeated operations.
本発明の目的は、上述の欠点を除去し駆動時に
圧電素子に作用する曲げモーメントを軽減して動
作中の圧電素子の折損破壊を防止するようにした
印字エレメントを提供することにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide a printing element which eliminates the above-mentioned drawbacks, reduces the bending moment acting on the piezoelectric element during driving, and prevents the piezoelectric element from breaking or breaking during operation.
本発明のエレメントは、一端をベース部材に保
持してあり他端に圧電縦効果による寸法歪を発生
する柱状の圧電素子と、一端部が前記圧電素子の
前記他端に板状の第１のヒンジを介し接続し且つ
前記ベース部材に板状の第２のヒンジを介し接続
している第１のレバーと、一端部が前記圧電素子
の前記他端に板状の第３のヒンジを介し接続し且
つ前記ベース部材に板状の第４のヒンジを介し接
続している第２のレバーと、前記第１および第２
のレバーの他端部にそれぞれ板状のヒンジを介し
接続しており且つ印字用ワイヤを取付けた第３の
レバーとを備え、前記第１および第２のヒンジ間
の距離と前記第３および第４のヒンジ間の距離と
は互いに異なり且つ前記第１および第３のヒンジ
について前記距離の大きな方のヒンジの板厚を他
方のヒンジの板厚よりも大きく設定してある。 The element of the present invention includes a columnar piezoelectric element whose one end is held by a base member and which generates dimensional distortion due to a piezoelectric longitudinal effect at the other end, and a plate-shaped first element whose one end is attached to the other end of the piezoelectric element. a first lever connected via a hinge and connected to the base member via a plate-shaped second hinge, and one end portion of which is connected to the other end of the piezoelectric element via a plate-shaped third hinge; and a second lever connected to the base member via a plate-shaped fourth hinge;
and a third lever connected to the other end of the lever through a plate-shaped hinge and having a printing wire attached thereto, the distance between the first and second hinges and the third and third levers being connected to the other ends of the levers. The distances between the four hinges are different from each other, and the thickness of the hinge with the larger distance is set to be larger than the thickness of the other hinge among the first and third hinges.
次に図面を参照して本発明を詳細に説明する。 Next, the present invention will be explained in detail with reference to the drawings.
第２図は本発明の一実施例を示す部分側面図で
ある。本実施例のエレメントでは、レバー１１に
接続しているヒンジ５および６の間の距離L1が、
レバー１２に接続しているヒンジ７および８の間
の距離L2よりも大きく、距離L1およびL2の差異
に対応して、ヒンジ６の板厚d1をヒンジ７の板厚
d2よりも大きくしてある。 FIG. 2 is a partial side view showing one embodiment of the present invention. In the element of this embodiment, the distance L 1 between the hinges 5 and 6 connected to the lever 11 is
Greater than the distance L 2 between the hinges 7 and 8 connected to the lever 12, and corresponding to the difference between the distances L 1 and L 2 , the plate thickness d 1 of the hinge 6 is set to the plate thickness of the hinge 7.
It is made larger than d 2 .
駆動時に、圧電素子２の長さが伸びて寸法歪を
生ずると、これに応じて取付部材９が上方へ押上
げられ、レバー１１および１２にはそれぞれ破線
矢印ＥおよびＧの向きの回転運動を生ずる。この
回転運動に伴つて、ヒンジ６および７の板面に曲
げを生ずる。ところが、L1＞L2であるため、ヒ
ンジ６に生ずる曲げの曲率の方が、ヒンジ７に生
ずる曲げの曲率よりも小さくなる。従来のエレメ
ントでは、ヒンジ５ないし８の板厚を全て等しく
設定しており、その結果ヒンジ６および７の曲げ
剛性は互いに等しく、従つてヒンジ６に作用する
曲げモーメントの方がヒンジ７に作用する曲げモ
ーメントよりも小さくなる。このため、従来のエ
レメントではヒンジ６および７の曲げモーメント
により取付部材９に作用する二つの反力は、互い
に逆向きであるが、相異なる大きさになり、両反
力の合成力である右向きの力が取付部材９に作用
して、圧電素子２に曲げモーメントを与え、折損
破壊の原因になる。 During driving, when the length of the piezoelectric element 2 increases and dimensional distortion occurs, the mounting member 9 is pushed upward in response to this, and the levers 11 and 12 are given rotational movements in the directions of dashed arrows E and G, respectively. arise. Along with this rotational movement, bending occurs in the plate surfaces of the hinges 6 and 7. However, since L 1 >L 2 , the curvature of the bend occurring in the hinge 6 is smaller than the curvature of the bend occurring in the hinge 7. In the conventional element, the plate thicknesses of hinges 5 to 8 are all set to be equal, and as a result, the bending rigidities of hinges 6 and 7 are equal to each other, so that the bending moment that acts on hinge 6 acts more on hinge 7. smaller than the bending moment. Therefore, in the conventional element, the two reaction forces acting on the mounting member 9 due to the bending moments of the hinges 6 and 7 are opposite to each other, but have different magnitudes, and the resultant force of the two reaction forces is a rightward force. The force acts on the mounting member 9, imparting a bending moment to the piezoelectric element 2, causing breakage.
本実施例では、駆動時にヒンジ６および７に作
用する曲げモーメントが互いに等しくなるよう
に、すなわち曲げの曲率の小さいヒンジ６の方が
曲げ曲率の大きいヒンジ７よりも曲げ剛性が大き
くなるように、板厚d1を板厚d2よりも大きく設定
してある。ヒンジ６および７の板長は互いに等し
くしてあるから、ヒンジ６および７の下方の材端
にそれぞれ作用する反力F1およびF2が互いに等
しい大きさになり、両反力は互いに打消しあう結
果取付部材９に作用する水平方向の反力は殆んど
ゼロになる。従つて、圧電素子２に与えられる曲
げモーメントは従来の場合に比べて著しく軽減さ
れ、圧電素子２の折損破壊を防止できる。 In this embodiment, the bending moments acting on the hinges 6 and 7 during driving are made equal to each other, that is, the bending rigidity of the hinge 6 with a small bending curvature is greater than that of the hinge 7 with a large bending curvature. The plate thickness d1 is set larger than the plate thickness d2 . Since the plate lengths of hinges 6 and 7 are equal to each other, the reaction forces F 1 and F 2 acting on the lower ends of hinges 6 and 7, respectively, are equal in magnitude, and both reaction forces cancel each other out. As a result, the horizontal reaction force acting on the mounting member 9 becomes almost zero. Therefore, the bending moment applied to the piezoelectric element 2 is significantly reduced compared to the conventional case, and breakage of the piezoelectric element 2 can be prevented.
なお本実施例の取付部材９の中央部に設けた板
状のヒンジは、エレメント製造時の加工付法誤差
などの起因するヒンジ６および７の曲げモーメン
トの打消しあいの不完全さを緩和するためのもの
である。その打消しあいの不完全さによつて圧電
素子２に作用する曲げ応力が、圧電素子２に折損
破壊を生ずる程大きくなければ、取付部材９の中
央部のヒンジを省略できる。 The plate-shaped hinge provided at the center of the mounting member 9 in this embodiment is used to alleviate imperfections in canceling out the bending moments of the hinges 6 and 7 caused by processing method errors during element manufacturing. belongs to. If the bending stress acting on the piezoelectric element 2 due to the incompleteness of the cancellation is not so large as to cause breakage of the piezoelectric element 2, the hinge at the center of the mounting member 9 can be omitted.
以上の説明から明らかなごとく、本発明には駆
動時に圧電素子に作用する曲げモーメントを軽減
して動作中に圧電素子の折損破壊が発生するのを
防止した印字エレメントを実現できるという効果
がある。 As is clear from the above description, the present invention has the effect of realizing a printing element that reduces the bending moment that acts on the piezoelectric element during driving and prevents the piezoelectric element from breaking or breaking during operation.
第１図は従来の印字エレメントを示す斜視図、
第２図は本発明の一実施例を示す部分側面図であ
る。
１……ベース部材、２……圧電素子、４，９…
…取付部材、５−８，１３，１４……ヒンジ、１
１，１２，１５……レバー、１６……ワイヤ。
FIG. 1 is a perspective view showing a conventional printing element;
FIG. 2 is a partial side view showing one embodiment of the present invention. 1... Base member, 2... Piezoelectric element, 4, 9...
...Mounting member, 5-8, 13, 14...Hinge, 1
1, 12, 15... lever, 16... wire.
Claims (1)
縦効果による寸法歪を発生する柱状の圧電素子
と、一端部が前記圧電素子の前記他端に板状の第
１のヒンジを介し接続し且つ前記ベース部材に板
状の第２のヒンジを介し接続している第１のレバ
ーと、一端部が前記圧電素子の前記他端に板状の
第３のヒンジを介し接続し且つ前記ベース部材に
板状の第４のヒンジを介し接続している第２のレ
バーと、前記第１および第２のレバーの他端部に
それぞれ板状のヒンジを介し接続しており且つ印
字用ワイヤを取付けた第３のレバーとを備え、前
記第１および第２のヒンジ間の距離と前記第３お
よび第４のヒンジ間の距離とは互いに異なり且つ
前記第１および第３のヒンジについて前記距離の
大きな方のヒンジの板厚を他方のヒンジの板厚よ
りも大きく設定してあることを特徴とする印字エ
レメント。1 A columnar piezoelectric element whose one end is held on a base member and whose other end generates dimensional distortion due to a piezoelectric longitudinal effect, and whose one end is connected to the other end of the piezoelectric element via a plate-shaped first hinge. a first lever connected to the base member via a plate-shaped second hinge; and a first lever whose one end is connected to the other end of the piezoelectric element via a plate-shaped third hinge, and the base member a second lever connected through a plate-shaped fourth hinge; and connected to the other ends of the first and second levers through plate-shaped hinges, and a printing wire is attached. a third lever, wherein the distance between the first and second hinges and the distance between the third and fourth hinges are different from each other, and the distance between the first and third hinges is large; A printing element characterized in that the thickness of one hinge is set larger than the thickness of the other hinge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15361584A JPS6131266A (en) | 1984-07-24 | 1984-07-24 | Printing element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15361584A JPS6131266A (en) | 1984-07-24 | 1984-07-24 | Printing element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6131266A JPS6131266A (en) | 1986-02-13 |
| JPH0376674B2 true JPH0376674B2 (en) | 1991-12-06 |
Family
ID=15566358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15361584A Granted JPS6131266A (en) | 1984-07-24 | 1984-07-24 | Printing element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6131266A (en) |
-
1984
- 1984-07-24 JP JP15361584A patent/JPS6131266A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6131266A (en) | 1986-02-13 |
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