JP3964942B2 - Hammer mechanism - Google Patents

Hammer mechanism Download PDF

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Publication number
JP3964942B2
JP3964942B2 JP23093395A JP23093395A JP3964942B2 JP 3964942 B2 JP3964942 B2 JP 3964942B2 JP 23093395 A JP23093395 A JP 23093395A JP 23093395 A JP23093395 A JP 23093395A JP 3964942 B2 JP3964942 B2 JP 3964942B2
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JP
Japan
Prior art keywords
printing
hammer
spring
plate
leaf spring
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
Application number
JP23093395A
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Japanese (ja)
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JPH0970991A (en
Inventor
幸一 谷下田
Original Assignee
リコープリンティングシステムズ株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by リコープリンティングシステムズ株式会社 filed Critical リコープリンティングシステムズ株式会社
Priority to JP23093395A priority Critical patent/JP3964942B2/en
Publication of JPH0970991A publication Critical patent/JPH0970991A/en
Application granted granted Critical
Publication of JP3964942B2 publication Critical patent/JP3964942B2/en
Anticipated expiration legal-status Critical
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Description

【0001】
【産業上の利用分野】
本発明は行方向に沿って並べて設けられた複数のスプリングチャージ式ドット印字ハンマを保持したハンマバンクを行方向に沿って往復移動させ、この往復移動の過程でドット行を印字するドットラインプリンタのハンマ機構部に関するものである。
【0002】
【従来の技術】
図3及び図4に示すように、印字ハンマの板バネ5を例えばマグネット2の磁気吸引力によって非印字位置に保持し、釈放用電磁コイル7(以下単にコイルという)に所定パルス幅の釈放電流を供給することによって前記印字ハンマを釈放飛行させて印字するスプリングチャージ式印字ハンマでは、板バネ5はリアプレートを介してヨークベースに固定されている。
【0003】
【発明が解決しようとする課題】
しかし、上記した従来のハンマ機構部には次のような問題がある。
【0004】
印字速度の高速化に伴い、単位時間当たりの打撃数が多くなると、印字ハンマ駆動周期を上げるため、一般的には板バネのバネ常数を高くする必要がある。
【0005】
バネ常数が高くなれば、ばねの長さ変化による固有振動数の変化も大きくなる。固有振動数の変化が大きくなればハンマの駆動周期もばらつき、この結果印字用紙に打たれるタイミングが異なり、最終的に印字品質も低下するという問題があった。
【0006】
本発明の目的は、上記した従来技術の欠点をなくし、高速化に伴い印字ハンマのバネ常数が上がっても印字ハンマのバネ常数を安定にさせるため、印字ハンマの固定端を確実にし、印字品質の低下を防止することである。
【0007】
上記した目的を達成するために、本発明は印字ハンマの後部固定端側に設けたリアプレートの板バネ支点近傍で、かつ締結部材よりも先端側に溝を設けたことを特徴とするものである。
【0008】
【作用】
上記構成によれば、印字速度の高速化に伴い印字ハンマのバネ常数が上がっても印字ハンマのスプリングの支点を常に一定になるようにしたので、印字ハンマのバネ常数のバラツキを押さえ、印字品質の低下を防止することができる。
【0009】
【実施例】
以下実施例図面を参照して本発明を説明する。
【0010】
図1は本発明ハンマ機構部の側面図を示すものある。ハンマ機構部は磁気回路を構成するヨーク1、ヨークベース3、フロントヨーク4及びリアプレート9と、磁気を発生するマグネット2と、印字をつかさどる印字ピン6と、印字エネルギをバネのたわみとして蓄えるための板バネ5と、そのたわみ量を調整するためのアジャストプレート11及びアジャストスクリュ12と、マグネット2の磁気を打ち消し板バネ5を飛翔させ印字ピン6によりドットを形成させるためのコイル7より構成されている。
【0011】
また、印字をつかさどるインクリボン8、インクリボン8のインクを印字用紙14に転写するためのプラテン10、インクリボン8のインクが印字用紙14につかないようにするためのリボンセパレータ13を有する。
【0012】
以上からなるハンマ機構部において、図2に示す如く上部に溝Aを設けたリアプレート9を固定する。
【0013】
ここで、溝Aを設けた側は板バネ5の当接面側とし、固定する。
【0014】
この結果、板バネ5はリアプレート9全体に当ることがなくなり、両者の接触面積を小さくすることができる。これにより、板バネ5のそり量は少なくなり、板バネ5を支点に近い部分でのみ抑えられるようになる。従って、印字ハンマのバネ常数が上がっても印字ハンマのスプリングの支点を常に一定とすることができる。
【0015】
すなわち、印字ハンマの板バネ5の支点はリアプレート9との接触部分を上部支点近傍としたことによりバネの長さを安定させることができ、バネ常数を安定にできる。
【0016】
【発明の効果】
以上説明したように、本発明によれば、印字ハンマのバネ常数が上がっても印字ハンマの固定端を常に上部端面で安定させるようにし、この結果印字ハンマのスプリング長を常に安定化させるようにしたので、印字ハンマのバネ常数のバラツキを押さえ、印字品質の低下を防止することができる。
【図面の簡単な説明】
【図1】 本発明ドットラインプリンタに使用されるハンマ機構部の一実施例を示 す側面図である。
【図2】 図1の主要部の側面図である。
【図3】 従来例を示す側面図である。
【図4】 図3の主要部の側面図である。
【符号の説明】
1はヨーク、2はマグネット、3はヨークベース、4はフロントヨーク、5は板バネ、6は印字ピン、7はコイル、8はインクリボン、9・91はリアプレート、10はプラテン、11はアジャストプレート、12はアジャストスクリュ、13はリボンセパレータ、14は印字用紙、Aは溝を示す。
[0001]
[Industrial application fields]
The present invention relates to a dot line printer that reciprocates a hammer bank holding a plurality of spring-charged dot printing hammers arranged side by side in the row direction and prints the dot rows in the process of this reciprocation. This relates to the hammer mechanism.
[0002]
[Prior art]
As shown in FIGS. 3 and 4, the leaf spring 5 of the printing hammer is held at a non-printing position by, for example, the magnetic attraction force of the magnet 2, and a release current having a predetermined pulse width is supplied to the release electromagnetic coil 7 (hereinafter simply referred to as a coil). In the spring charge type printing hammer that performs printing by releasing the printing hammer by supplying the leaf spring 5, the leaf spring 5 is fixed to the yoke base via the rear plate.
[0003]
[Problems to be solved by the invention]
However, the conventional hammer mechanism described above has the following problems.
[0004]
When the number of strikes per unit time increases as the printing speed increases, it is generally necessary to increase the spring constant of the leaf spring in order to increase the printing hammer drive cycle.
[0005]
As the spring constant increases, the change in natural frequency due to the change in spring length also increases. If the change in the natural frequency becomes large, the hammer driving cycle also varies, and as a result, there is a problem in that the timing at which the hammer is struck differs, and the print quality is ultimately lowered.
[0006]
The object of the present invention is to eliminate the drawbacks of the prior art described above, and to stabilize the printing hammer's spring constant even if the printing hammer's spring constant increases as the speed increases. It is to prevent the decrease of.
[0007]
In order to achieve the above-described object, the present invention is characterized in that a groove is provided in the vicinity of a leaf spring fulcrum of the rear plate provided on the rear fixed end side of the printing hammer and on the tip side of the fastening member. is there.
[0008]
[Action]
According to the above configuration, the fulcrum of the printing hammer spring is always kept constant even if the printing hammer spring constant increases as the printing speed is increased. Can be prevented.
[0009]
【Example】
Hereinafter, the present invention will be described with reference to the accompanying drawings.
[0010]
FIG. 1 shows a side view of the hammer mechanism of the present invention. The hammer mechanism unit stores the yoke 1, the yoke base 3, the front yoke 4, and the rear plate 9 constituting the magnetic circuit, the magnet 2 that generates magnetism, the printing pin 6 that controls printing, and the printing energy as deflection of the spring. Plate spring 5, adjustment plate 11 and adjustment screw 12 for adjusting the amount of deflection, and coil 7 for canceling the magnetism of magnet 2 and flying plate spring 5 to form dots by printing pins 6. ing.
[0011]
Further, an ink ribbon 8 that controls printing, a platen 10 for transferring the ink of the ink ribbon 8 to the printing paper 14, and a ribbon separator 13 for preventing the ink of the ink ribbon 8 from sticking to the printing paper 14 are provided.
[0012]
In the hammer mechanism portion as described above, the rear plate 9 provided with the groove A in the upper portion is fixed as shown in FIG.
[0013]
Here, the side where the groove A is provided is the contact surface side of the leaf spring 5 and is fixed.
[0014]
As a result, the leaf spring 5 does not hit the entire rear plate 9, and the contact area between the two can be reduced. As a result, the amount of warpage of the leaf spring 5 is reduced, and the leaf spring 5 can be suppressed only at a portion close to the fulcrum. Therefore, even if the spring constant of the printing hammer increases, the fulcrum of the printing hammer spring can be kept constant.
[0015]
That is, the fulcrum of the leaf spring 5 of the printing hammer can stabilize the spring length by making the contact portion with the rear plate 9 near the upper fulcrum, and the spring constant can be stabilized.
[0016]
【The invention's effect】
As described above, according to the present invention, even if the spring constant of the printing hammer increases, the fixed end of the printing hammer is always stabilized at the upper end surface, and as a result, the spring length of the printing hammer is always stabilized. As a result, variations in the spring constant of the printing hammer can be suppressed, and deterioration in printing quality can be prevented.
[Brief description of the drawings]
FIG. 1 is a side view showing an embodiment of a hammer mechanism used in a dot line printer of the present invention.
FIG. 2 is a side view of the main part of FIG.
FIG. 3 is a side view showing a conventional example.
4 is a side view of the main part of FIG. 3;
[Explanation of symbols]
1 is a yoke, 2 is a magnet, 3 is a yoke base, 4 is a front yoke, 5 is a leaf spring, 6 is a printing pin, 7 is a coil, 8 is an ink ribbon, 9/91 is a rear plate, 10 is a platen, 11 is An adjustment plate, 12 is an adjustment screw, 13 is a ribbon separator, 14 is printing paper, and A is a groove.

Claims (1)

板バネと印字ピンで構成されており印字行に沿って所定ピッチで並べて配置された複数のドット印字ハンマと、該印字ハンマを非印字位置に保持するために磁気吸引力を発生する磁石手段と、前記印字ハンマを固定するため印字ハンマの後部固定端側に設けたリアプレートと、前記板バネのバネ常数を調整するアジャストプレート及びアジャストスクリュと、前記板バネ、リアプレート及びアジャストプレートを締結する締結部材と、前記印字ハンマを駆動するために各印字ハンマに対応して設けられ、所定幅のパルス電流が供給されて前記磁石手段の磁界を打ち消す釈放用電磁コイルと、前記印字ハンマを保持し、行方向に沿って往復移動するハンマバンクと、該ハンマバンクを往復移動させるためのシャトル機構を備え、前記ハンマバンクの往復移動の過程で前記各印字ハンマを駆動して印字するドットラインプリンタであって、前記リアプレートの板バネ当接面側の板バネ支点近傍で、かつ前記締結部材よりも先端側に溝を設けたことを特徴とするドットラインプリンタA plurality of dot printing hammers configured by a leaf spring and a printing pin and arranged at a predetermined pitch along a printing line; and magnet means for generating a magnetic attractive force to hold the printing hammer in a non-printing position; The rear plate provided on the rear fixed end side of the printing hammer for fixing the printing hammer, the adjustment plate and adjustment screw for adjusting the spring constant of the plate spring, and the plate spring, rear plate and adjustment plate are fastened. A fastening member, a release electromagnetic coil that is provided corresponding to each printing hammer to drive the printing hammer, is supplied with a pulse current of a predetermined width and cancels the magnetic field of the magnet means, and holds the printing hammer. A hammer bank that reciprocates along the row direction, and a shuttle mechanism for reciprocating the hammer bank, the hammer bank Grooves of the in the course of reciprocating a dot line printer for printing by driving the print hammer, a leaf spring supporting point near the leaf spring contact surface side of the rear plate and the front end side of the fastening member A dot line printer characterized by comprising:
JP23093395A 1995-09-08 1995-09-08 Hammer mechanism Expired - Fee Related JP3964942B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23093395A JP3964942B2 (en) 1995-09-08 1995-09-08 Hammer mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23093395A JP3964942B2 (en) 1995-09-08 1995-09-08 Hammer mechanism

Publications (2)

Publication Number Publication Date
JPH0970991A JPH0970991A (en) 1997-03-18
JP3964942B2 true JP3964942B2 (en) 2007-08-22

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ID=16915574

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23093395A Expired - Fee Related JP3964942B2 (en) 1995-09-08 1995-09-08 Hammer mechanism

Country Status (1)

Country Link
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Publication number Publication date
JPH0970991A (en) 1997-03-18

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