JP3580322B2 - Dot line printer - Google Patents

Dot line printer Download PDF

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Publication number
JP3580322B2
JP3580322B2 JP731995A JP731995A JP3580322B2 JP 3580322 B2 JP3580322 B2 JP 3580322B2 JP 731995 A JP731995 A JP 731995A JP 731995 A JP731995 A JP 731995A JP 3580322 B2 JP3580322 B2 JP 3580322B2
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JP
Japan
Prior art keywords
hammer
print
printing
hammer bank
bank
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 - Lifetime
Application number
JP731995A
Other languages
Japanese (ja)
Other versions
JPH08192521A (en
Inventor
幸一 谷下田
俊男 比気
慎吾 中原
吉兼 松本
康喜 元木
浩宜 小林
悟 飛田
Original Assignee
日立プリンティングソリューションズ株式会社
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
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Priority to JP731995A priority Critical patent/JP3580322B2/en
Publication of JPH08192521A publication Critical patent/JPH08192521A/en
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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に関するものである。
【0002】
【従来の技術】
スプリングチャージ式印字ハンマのハンマバンクは、図1に示すように板バネ状印字ハンマ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印字する構成となっている。このハンマバンクにおいては、例えば図5に示すように、該ハンマバンクの往復移動を司るシャトル機構部11とボルト12により両端固定されていた。
【0003】
【発明が解決しようとする課題】
しかし、上記した従来のドットラインプリンタには次のような問題がある。
【0004】
印字速度の高速化に伴い、印字ハンマ駆動周期があがり、単位時間当たりの打撃数が多くなると、コイル7の励時時間も多くなる。コイル7の励時時間が多くなれば、コイル7より発生する熱も多くなり、その結果、ハンマバンク全体の温度が上昇する。
一方、ハンマバンクが固定されているシャトル機構部11の部材の温度上昇は、ほとんどない。
従って、その2つの部材間に温度差による熱応力が生じ、ちょうどバイメタルのような動きをすることとなり、図6の如く変形する。
【0005】
図6において、ハンマバンクが矢印の方向に変形すると、印字ピン6とプラテン10間のギャップが小さくなりインクリボン8の走行抵抗が増えてインクリボン8の動きが悪くなり、その結果、インクリボン8の同一場所をたたくことになり印字用紙にインクがのらない等の不具合が発生し印字品質が劣化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、印字ハンマの駆動周期が上がってハンマバンクの温度が上がっても、印字ピン6とプラテン10のギャップを常に確保し、印字品質の低下を防止することである。
【0007】
【問題を解決するための手段】
本発明は、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磁気吸引力を発生させる磁石手段と、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の供給により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されるハンマバンクと、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、該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において、前記ハンマバンクの一端にシャトル機構部に固定する締結部を設け、ハンマバンクの他端にシャトル機構部に対するハンマバンクの膨張を逃がす方向に摺動を可能とするスプリング等を介し固定した摺動部を設けたことを特徴とするドットラインプリンタ。
以上
【0008】
【作用】
上記構成によれば、印字速度の高速化により印字ハンマの駆動周期が上がり、ハンマバンクの温度が上昇しても、緩衝部を設けることにより熱応力を逃がし、印字ピンとプラテンのギャップを常に確保できるようにしたので、印字品質の低下をなくすことができる。
【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は本発明印字ハンマの側面図を示すもので、印字ハンマ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、磁気を発生するマグネット2及び、印字をつかさどる印字ピン6、印字エネルギーをバネのたわみとして蓄えるための板バネ5、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、印字を司るインクリボン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、ハンマバンクを桁方向へ移動させるためのシャトル機構部11より構成されてる。
【0011】
以上からなるハンマバンクにおいて、図2に示す如くヨークベース3の片方の端部を、スプリング13を介し固定する。ここで、スプリングの力Fは、ハンマバンクが印字反力に打ち勝つ力(最高DUTY印字で動かない力)以上とし、熱膨張をにがすことが可能な力とすることはいうまでもない。
【0012】
この結果、印字ピン6の駆動周期が速くなり、ハンマバンクが熱くなって膨張しても、このスプリング13部で矢印の方向に膨張を逃がすことが可能となる。
【0013】
なお、本発明においてヨークベース3の両端に緩衝部を設けると、ハンマバンク自体の位置がずれてしまい印字位置精度が低下することとなるので好ましくない。
【0014】
図4は本発明の他の実施例を示す。
【0015】
図4においては、ヨークベース3の端部は両方共ボルト22により固定されている。しかしながらシャトル機構部11において、ヨークベース3を固定するベース部の一方をスプリング13を介して固定することにより、前記実施例と同様の効果を得ることができる。
【0016】
【発明の効果】
以上詳述したように、本発明によれば、ハンマバンクが熱くなっても、シャトル機構部とハンマバンク間のスプリング部で熱膨張を逃がすことが可能となるので、ギャップ方向に変形することがなくなり、常に安定した高印字品質のドットラインプリンタを提供できるようになる。
【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印字ハンマの一実施例を示す側面図である。
【図2】図1の主要部の正面図である。
【図3】図2の印字中における上面図である。
【図4】本発明における他の実施例を示す正面図である。
【図5】従来例を示す正面図である。
【図6】図5の印字中における上面図である。
【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はリボンセパレータ、10はプラテン、11はシャトル機構部、12、22はボルト、13はスプリング、14は印字用紙、15はシャフトを示す。
[0001]
[Industrial applications]
The present invention relates to a dot line printer that reciprocates a hammer bank holding a plurality of spring-charged dot printing hammers provided side by side along a row direction along a row direction and prints a dot row in the process of the reciprocation. It is about.
[0002]
[Prior art]
As shown in FIG. 1, a hammer bank of a spring charge type printing hammer holds a leaf spring-like printing hammer at a non-printing position by, for example, a magnetic attraction force of a magnet 2, and a predetermined value is applied to a release electromagnetic coil 7 (hereinafter simply referred to as a coil). By supplying a release current having a pulse width, the printing hammer is released and printed. In this hammerbank, for example, as shown in FIG. 5, both ends of the hammerbank are fixed by a shuttle mechanism 11 and a bolt 12 for reciprocating the hammerbank.
[0003]
[Problems to be solved by the invention]
However, the above-mentioned conventional dot line printer has the following problems.
[0004]
As the printing speed increases, the printing hammer drive cycle increases, and the number of hits per unit time increases, so that the excitation time of the coil 7 also increases. When the excitation time of the coil 7 increases, the heat generated from the coil 7 also increases, and as a result, the temperature of the entire hammerbank increases.
On the other hand, the temperature of the members of the shuttle mechanism 11 to which the hammerbank is fixed hardly increases.
Therefore, a thermal stress is generated between the two members due to a temperature difference, and the two members just move like a bimetal, and deform as shown in FIG.
[0005]
In FIG. 6, when the hammer bank is deformed in the direction of the arrow, the gap between the print pin 6 and the platen 10 is reduced, the running resistance of the ink ribbon 8 is increased, and the movement of the ink ribbon 8 is deteriorated. In this case, there is a problem that the same location is hit and a problem such as no ink on the printing paper occurs and the printing quality is deteriorated.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned disadvantages of the prior art and to always maintain a gap between the printing pin 6 and the platen 10 even when the driving cycle of the printing hammer is increased and the temperature of the hammer bank is increased, thereby reducing the printing quality. It is to prevent.
[0007]
[Means to solve the problem]
The present invention comprises a leaf spring and a printing pin, and generates a plurality of dot printing hammers arranged at a predetermined pitch along a printing line, and a magnetic attraction force for holding the printing hammer at a non-printing position. Magnet means, provided to correspond to each print hammer to drive the print hammer, holding a release electromagnetic coil for canceling the magnetic field of the magnet means by supplying a pulse current of a predetermined width, holding the print hammer, and the hammer bank which is reciprocated along the row direction, a dot line printer includes a shuttle mechanism for reciprocating the hammer bank, printing by driving the respective printing hammer during reciprocation of said hammer bank in the provided at one end of the hammer bank fastening portion for fixing to the shuttle mechanism, the expansion of the hammer bank for the other end to the shuttle mechanism of the hammer bank Dot line printer, characterized in that a fixed sliding part via a spring or the like to enable sliding in the gas direction.
[0008]
[Action]
According to the above configuration, even if the driving cycle of the printing hammer is increased by increasing the printing speed and the temperature of the hammer bank is increased, the thermal stress is released by providing the buffer portion, and the gap between the printing pin and the platen can always be secured. As a result, it is possible to prevent a decrease in print quality.
[0009]
【Example】
Hereinafter, the present invention will be described with reference to the accompanying drawings.
[0010]
FIG. 1 shows a side view of the printing hammer of the present invention. The printing hammer includes a yoke 1, a yoke base 3, a front yoke 4, a magnet 2 for generating magnetism, a printing pin 6, which controls printing, and a printing circuit. A leaf spring 5 for storing energy as a spring deflection, a coil 7 for canceling the magnetism of the magnet 2 and causing the leaf spring 5 to fly to form dots by the print pins 6, an ink ribbon 8 for printing, and ink for the ink ribbon 8 And a shuttle mechanism 11 for moving the hammer bank in the column direction.
[0011]
In the above-described hammerbank, one end of the yoke base 3 is fixed via a spring 13 as shown in FIG. Here, it is needless to say that the force F of the spring is equal to or greater than the force with which the hammerbank overcomes the printing reaction force (the force at which the hammerbank does not move in the maximum DUTY printing), and is a force that can remove thermal expansion.
[0012]
As a result, the driving cycle of the print pin 6 is increased, and even if the hammer bank becomes hot and expands, the spring 13 can release the expansion in the direction of the arrow.
[0013]
In the present invention, providing the buffer portions at both ends of the yoke base 3 is not preferable because the position of the hammer bank itself is shifted and the printing position accuracy is reduced.
[0014]
FIG. 4 shows another embodiment of the present invention.
[0015]
In FIG. 4, both ends of the yoke base 3 are fixed by bolts 22. However, in the shuttle mechanism 11, by fixing one of the base portions for fixing the yoke base 3 via the spring 13, the same effect as in the above embodiment can be obtained.
[0016]
【The invention's effect】
As described in detail above, according to the present invention, even if the hammerbank becomes hot, it becomes possible to release the thermal expansion at the spring portion between the shuttle mechanism and the hammerbank, so that the deformation in the gap direction is possible. As a result, a stable and high-quality dot line printer can be provided.
[Brief description of the drawings]
FIG. 1 is a side view showing an embodiment of a print hammer used in a dot line printer of the present invention.
FIG. 2 is a front view of a main part of FIG.
FIG. 3 is a top view during printing of FIG. 2;
FIG. 4 is a front view showing another embodiment of the present invention.
FIG. 5 is a front view showing a conventional example.
FIG. 6 is a top view during printing of FIG. 5;
[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 print pin, 7 is a coil, 8 is an ink ribbon, 9 is a ribbon separator, 10 is a platen, and 11 is a shuttle mechanism. Reference numerals 12, 22 indicate bolts, 13 indicates a spring, 14 indicates printing paper, and 15 indicates a shaft.

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磁気吸引力を発生させる磁石手段と、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の供給により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されるハンマバンクと、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、該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、前記ハンマバンクの一端にシャトル機構部に固定する締結部を設け、ハンマバンクの他端にシャトル機構部に対するハンマバンクの膨張を逃がす方向に摺動を可能とするスプリング等を介し固定した摺動部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 print hammers, which are composed of leaf springs and print pins, are arranged at a predetermined pitch along a print line, and magnet means for generating a magnetic attraction force for holding the print hammers at a non-print position, An electromagnetic coil for release provided to correspond to each print hammer for driving the print hammer, canceling the magnetic field of the magnet means by supplying a pulse current of a predetermined width, and holding the print hammer, along a row direction. and the hammer bank is reciprocated Te, provided with a shuttle mechanism for reciprocating the hammer bank, a dot line printer for printing by driving the respective printing hammer during reciprocation of said hammer bank, wherein providing the fastening portion for fixing to the shuttle mechanism at one end of the hammer bank, a direction to release the expansion of the hammer bank for the other end to the shuttle mechanism of the hammer bank Dot line printer, characterized in that a sliding portion fixed via a spring such as to enable sliding.
JP731995A 1995-01-20 1995-01-20 Dot line printer Expired - Lifetime JP3580322B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP731995A JP3580322B2 (en) 1995-01-20 1995-01-20 Dot line printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP731995A JP3580322B2 (en) 1995-01-20 1995-01-20 Dot line printer

Publications (2)

Publication Number Publication Date
JPH08192521A JPH08192521A (en) 1996-07-30
JP3580322B2 true JP3580322B2 (en) 2004-10-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP731995A Expired - Lifetime JP3580322B2 (en) 1995-01-20 1995-01-20 Dot line printer

Country Status (1)

Country Link
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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8657409B1 (en) * 2012-10-17 2014-02-25 Printronix, Inc. Line printer hammer banks
CN104816471B (en) * 2014-11-25 2018-02-16 广州航新航空科技股份有限公司 Print head assembly and printer and aircraft printer with the print head assembly

Also Published As

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JPH08192521A (en) 1996-07-30

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