JP3904070B2 - Dot printer - Google Patents

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Publication number
JP3904070B2
JP3904070B2 JP2002150771A JP2002150771A JP3904070B2 JP 3904070 B2 JP3904070 B2 JP 3904070B2 JP 2002150771 A JP2002150771 A JP 2002150771A JP 2002150771 A JP2002150771 A JP 2002150771A JP 3904070 B2 JP3904070 B2 JP 3904070B2
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Japan
Prior art keywords
platen
printing
printing paper
dot printer
position adjusting
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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
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JP2002150771A
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Japanese (ja)
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JP2003341159A (en
Inventor
孝 各務
道誠 綿引
浩宜 小林
誠 篠原
福治 根矢
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リコープリンティングシステムズ株式会社
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Priority to JP2002150771A priority Critical patent/JP3904070B2/en
Publication of JP2003341159A publication Critical patent/JP2003341159A/en
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Description

【0001】
【発明の属する技術分野】
本発明は、ドットプリンタの紙送り機構部に関するものである。
【0002】
【従来の技術】
図2にドットプリンタの印字機構部の概略の一例を示す。図2において、複数の印字素子10を有するハンマバンク1は、図示しないシャトル機構部により桁方向に往復運動する。また、ハンマバンク1はインクリボン2と印字用紙3とを間に挟み、印字力を支持する為のプラテン5と対向した状態で配置されていて、ハンマバンク1が往復運動している状態で、印字素子10が適時駆動される毎にドットマトリクスの形で文字、図形等が印字用紙3に印字される。印字用紙3は、おおよそペーパーガイド8に沿い、トラクタ4によって、搬送される。
【0003】
プラテン5は、上方からバネ力発生手段となる板バネ7によって下方に押しつけられおり、上下方向を拘束されている。なお、プラテン5を上下方向に押さえ込んでいる部品は図示していないフレーム等にしっかりと固定されている。また、プラテン5は印字用紙3に対して離れる方向(図2では右方向)へ開き、反対方向(図2では左方向)へ閉じるいわゆるプラテン開閉動作を行なうことができる。
【0004】
また、ドットプリンタはハンマバンク1とプラテン5間のギャップを一定にして印字素子の打撃力及び打撃に要する時間を一定にする為、また、プラテン形状の簡素化によるコストダウンを図る為、プラテン打撃面6はフラット(平面)形状にしてある。
【0005】
【発明が解決しようとする課題】
前述したように、ドットプリンタは印字素子とプラテン打撃面間にインクリボンと印字用紙を挟み込み、印字素子で打撃力を与える事によって印字用紙に文字、図形等を印字していく。この時、印字素子の打撃力はプラテン打撃面にて受ける事になる。印字を一定ライン数続けると、印字素子の打撃力によってプラテン表面は凹部分が形成される。凹部分が形成されると印字素子が発生する打撃力がプラテン打撃面6で確実に受けられず、印字用紙上で減少して、印字濃度が薄くなる等、印刷品質への悪影響が出てくる。プラテン打撃面がR面(曲面)である場合、プラテンを回転させる機構を用いれば、印字素子との接触面を新たにできるが、プラテン打撃面がフラット(平面)に形成された固定式プラテンの場合、プラテン回転による打撃面の変更ができない。その為、一定ライン数を印字したプラテンは新品に交換をする事になる。
【0006】
しかし、一般的にプラテン5の交換作業は時間がかかり作業も煩雑になる為、保守員による作業となり、当然この作業間は印刷動作を実施できない。
【0007】
本発明の目的は、従来、打撃面変更が困難であったフラットタイプのプラテンにおいて、簡単な部品を追加したのみで容易にプラテンのハンマピン打撃位置(凹部)を移動させることができ、全く新しい打撃面を生成させてプラテンの交換無しに寿命を延ばすことができるプラテン機構を提供する事である。
【0008】
【課題を解決するための手段】
本発明は、複数個の印字素子を搭載したハンマバンクと、前記ハンマバンクを往復移動させる為のシャトル機構と、印字用紙の搬送方向に設けたペーパーガイドと、前記印字素子の印字力を保持する打撃面がフラットで印字用紙に対して直角方向に開閉動作ができ、バネ力発生手段によって下方に押しつけられて上下方向の位置決めがなされているプラテンと、前記印字用紙を搬送する少なくとも1対のトラクタとを有し、前記印字素子と前記プラテンの間に前記印字用紙とインクリボンを配置して前記ハンマバンクの往復運動の過程で前記印字素子を適時駆動することで前記印字用紙に文字、図形等を印字するドットプリンタにおいて、前記プラテンの下に薄板形状のプラテン位置調整手段を設けたことを特徴とする。前記プラテン位置調整手段は、一方向に力を加えることで前記プラテンから引き抜き可能であり、また、前記印字用紙と前記プラテンの距離が変化する方向に動作するプラテン開閉動作時においても、前記プラテンの摩擦力によって設定位置を外れる事の無いように折り曲げ部を有しており、更には、プラテンの開閉動作による摩擦に対して耐摩耗性のある材料で製作したことを特徴とする。
【0009】
【発明の実施の形態】
本発明の実施例を図1に示す。図1において、図2と同じ部分は同じ符号で示してある。プラテン位置調整手段となるプラテンスペーサ9はプラテン5の下に挟みこむ構成となっており、上方に引張る事で、容易に引き抜けるように上方に向かって長い構造となっている。プラテン打撃面6を変更させる場合は、プラテン5下に挟み込んであるプラテンスペーサ9を上方に引き抜く(図示方向)。プラテン5は上方から板バネ7によって下方に押されている為、プラテンスペーサ9の厚さ分だけプラテン5が下がる。よって、印字素子10とプラテン打撃面6の打撃位置が変わる事となるので、印字素子10の打撃力によって、プラテン打撃面6上にできた凹部を避ける事ができ、プラテン5を交換せずに印刷を継続する事ができる。図3を用いて、印字素子10とプラテン打撃面6の関係について更に詳しく説明する。
【0010】
図3はプラテン打撃面6を印字素子10側から見た図である。通常、ドットプリンタは複数個の印字素子10を搭載しているが図3ではそのうち一部のみを表記している。図中Aは印字素子10による打撃点、Pは印字素子10の距離(印字素子10の配列距離)、δ1はプラテンスペーサ9の引き抜きによるプラテン5の移動距離、φDは印字素子直径である。δ1はPの半分の距離すなわち上下に隣り合う印字素子10の中点に合わせると良い。
【0011】
プラテンスペーサ9が挟まった状態で印刷を実行すると、印字素子の打撃力によって、L1’、L2’・・・と溝状に凹部が形成される。ここで、プラテンスペーサ9を抜き取ると、δ1だけ上方に移動したL1、L2、・・・に印字素子10の位置が変わる。この時、余裕量δ2が存在する、すなわち、
δ2=δ1−φD−δ3>0
であれば全く新規のプラテン打撃面6を得る事ができる。ここで、δ3は前述したプラテン5の開閉等によるプラテン5及びプラテンスペーサ9の摩耗による厚さ方向の減少量である。
【0012】
なお、δ2が存在できないと本発明は適用できない為、存在できるようなδ1となるプラテンスペーサ9となるよう、材料の厚さを選定する必要がある。
【0013】
本発明者等が試作した紙送り機構部でテストした所、
P=0.847mm δ1=0.35mmでδ1はPのおおよそ中点であり、
φD=0.22mm δ3=0.025mm(プラテン寿命までの予想プラテン開閉回数を動作させて摩耗量を測定した)であった為、
δ2=0.105mmであり、問題なくプラテン5の位置移動ができた。
【0014】
図4は本発明者等が試作したプラテンスペーサ9である。材料はルミラーシート(東レ製ポリエステルフィルム、厚さ0.35mm、幅約10mm)を用いて製作した。プラテン開閉動作時のプラテン5との摩擦力で、図中A部はプラテンスペーサ9が印字素子10方向(本図では紙面に対して左右方向)へずれるのを防止する為にコの字型に曲げてある。また、プラテンスペーサ9を仮止めテープで紙送りフレーム8に固定する事で、桁方向(本図では紙面に対して鉛直方向)へのずれも防止し、また安易に取り外されないようにしている(この仮止めテープ自体は比較的容易に外せるものである)。
【0015】
B部は密着曲げになっており、プラテン5の上方に引き抜けるようになっている。実際にプラテンスペーサ9を上方に引張ると、板バネ7によってプラテン5が下方に押さえられている為、弱い部分である密着曲げ部分(B部)が図5のように伸びる。更に引張ると今度はプラテン5に挟まれている部分が抜け、紙送り機構部4から完全に抜き取る事が可能であった。
【0016】
なお、本発明では、プラテンスペーサ9を単独で使用しているが、δ2>0を満たすのであれば、プラテンスペーサ9を複数枚重ねて使用すれば更にプラテン5の寿命を延ばす事が可能である。
【0017】
【発明の効果】
本発明によれば、プラテン位置調整手段を抜き取る事で、印字素子とプラテン打撃面の接触点を変える事が出きる為、プラテンを交換する事なく印刷品質を維持でき、プラテンの長寿命化を実現できる。
【図面の簡単な説明】
【図1】本発明によるドットプリンタの紙送り機構部の一実施例を示す図。
【図2】従来のドットプリンタの紙送り機構部の一例を示す図。
【図3】本発明によるドットプリンタの印字素子側から見たプラテン打撃面の印字素子による打撃位置を示す図。
【図4】本発明によるドットプリンタのプラテン位置調整手段の形状の一例を示す図。
【図5】図4に示すドットプリンタのプラテン位置調整手段の抜き取り時の形状変化の説明図。
【符号の説明】
1はハンマバンク、2はインクリボン、3は印字用紙、5はプラテン、6はプラテン打撃面、7はバネ力発生手段、9はプラテン位置調整手段、10は印字素子である。
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper feed mechanism of a dot printer.
[0002]
[Prior art]
FIG. 2 shows an example of an outline of the printing mechanism of the dot printer. In FIG. 2, the hammer bank 1 having a plurality of printing elements 10 reciprocates in the digit direction by a shuttle mechanism (not shown). The hammer bank 1 is disposed in a state where the ink ribbon 2 and the printing paper 3 are sandwiched between and opposed to the platen 5 for supporting the printing force, and the hammer bank 1 is reciprocating. Each time the printing element 10 is driven in a timely manner, characters, figures, etc. are printed on the printing paper 3 in the form of a dot matrix. The printing paper 3 is conveyed along the paper guide 8 by the tractor 4.
[0003]
The platen 5 is pressed downward by a plate spring 7 serving as a spring force generating means from above and is restrained in the vertical direction. In addition, the component which is pressing down the platen 5 in the vertical direction is firmly fixed to a frame or the like (not shown). Further, the platen 5 can perform a so-called platen opening / closing operation that opens in a direction away from the printing paper 3 (rightward in FIG. 2) and closes in the opposite direction (leftward in FIG. 2).
[0004]
In addition, the dot printer has a constant gap between the hammer bank 1 and the platen 5 so as to make the striking force and time required for the printing element constant, and to reduce the cost by simplifying the platen shape. The surface 6 has a flat (planar) shape.
[0005]
[Problems to be solved by the invention]
As described above, the dot printer sandwiches the ink ribbon and the printing paper between the printing element and the platen striking surface, and prints characters, figures, etc. on the printing paper by applying a striking force with the printing element. At this time, the striking force of the printing element is received by the platen striking surface. When printing is continued for a certain number of lines, a concave portion is formed on the platen surface by the striking force of the printing element. When the concave portion is formed, the striking force generated by the printing element is not reliably received by the platen striking surface 6 and decreases on the printing paper, resulting in a bad print quality, such as a decrease in printing density. . When the platen striking surface is an R surface (curved surface), a contact surface with the printing element can be renewed by using a mechanism that rotates the platen. However, the platen striking surface of the fixed platen that is formed flat (planar) In this case, the striking surface cannot be changed by rotating the platen. For this reason, the platen on which a certain number of lines are printed is replaced with a new one.
[0006]
However, generally, the replacement work of the platen 5 is time consuming and complicated, and is a work by maintenance personnel. Of course, the printing operation cannot be performed during this work.
[0007]
The object of the present invention is to make it possible to easily move the hammer pin striking position (concave portion) of a flat type platen, which has conventionally been difficult to change the striking surface, by simply adding simple parts. It is an object of the present invention to provide a platen mechanism capable of generating a surface and extending the life without replacing the platen.
[0008]
[Means for Solving the Problems]
The present invention has a hammer bank having a plurality of printing elements mounted thereon, a shuttle mechanism for reciprocating the hammer bank, a paper guide provided in the conveyance direction of printing paper, and a printing force of the printing elements. A platen that has a flat striking surface and can be opened and closed in a direction perpendicular to the printing paper, is pressed downward by a spring force generating means, and is positioned in the vertical direction, and at least a pair of tractors that convey the printing paper The printing paper and the ink ribbon are arranged between the printing element and the platen, and the printing element is driven in the course of the reciprocating motion of the hammer bank, thereby allowing characters, figures, etc. to be printed on the printing paper. In the dot printer for printing, a platen position adjusting means having a thin plate shape is provided under the platen. The platen position adjusting means can be pulled out from the platen by applying a force in one direction, and the platen position adjustment means can also be operated during a platen opening / closing operation in which the distance between the printing paper and the platen changes. It has a bent portion so that it does not deviate from the set position due to frictional force, and is further made of a material that is wear-resistant against friction caused by the opening / closing operation of the platen.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention is shown in FIG. 1, the same parts as those in FIG. 2 are denoted by the same reference numerals. A platen spacer 9 serving as a platen position adjusting means is configured to be sandwiched under the platen 5 and has a structure that is long upward so that it can be easily pulled out by pulling upward. When changing the platen striking surface 6, the platen spacer 9 sandwiched under the platen 5 is pulled upward (in the direction shown in the drawing). Since the platen 5 is pushed downward by the leaf spring 7 from above, the platen 5 is lowered by the thickness of the platen spacer 9. Therefore, the striking positions of the printing element 10 and the platen striking surface 6 are changed, so that the concave portion formed on the platen striking surface 6 can be avoided by the striking force of the printing element 10, and the platen 5 can be replaced without replacement. Printing can be continued. The relationship between the printing element 10 and the platen striking surface 6 will be described in more detail with reference to FIG.
[0010]
FIG. 3 is a view of the platen striking surface 6 as viewed from the printing element 10 side. Usually, a dot printer is equipped with a plurality of printing elements 10, but only some of them are shown in FIG. In the figure, A is a striking point by the printing element 10, P is a distance of the printing element 10 (arrangement distance of the printing elements 10), δ1 is a moving distance of the platen 5 by pulling out the platen spacer 9, and φD is a printing element diameter. δ1 may be set to a half distance of P, that is, to the midpoint of the printing elements 10 adjacent in the vertical direction.
[0011]
When printing is performed in a state where the platen spacer 9 is sandwiched, concave portions are formed in a groove shape such as L1 ′, L2 ′,... By the striking force of the printing element. Here, when the platen spacer 9 is extracted, the position of the printing element 10 changes to L1, L2,... Moved upward by δ1. At this time, there is a margin amount δ2, that is,
δ2 = δ1-φD-δ3> 0
Then, a completely new platen striking surface 6 can be obtained. Here, δ3 is a reduction amount in the thickness direction due to wear of the platen 5 and the platen spacer 9 due to the opening and closing of the platen 5 described above.
[0012]
Since the present invention cannot be applied if δ2 cannot exist, it is necessary to select the thickness of the material so that the platen spacer 9 having δ1 can exist.
[0013]
Tested by the paper feed mechanism section made by the inventors,
P = 0.847 mm δ1 = 0.35 mm and δ1 is approximately the midpoint of P,
Since φD = 0.22 mm δ3 = 0.025 mm (the amount of wear was measured by operating the expected number of platen opening / closing until the platen life)
Since δ2 = 0.105 mm, the position of the platen 5 could be moved without any problem.
[0014]
FIG. 4 shows a platen spacer 9 prototyped by the present inventors. The material was manufactured using Lumirror sheet (Toray polyester film, thickness 0.35 mm, width approximately 10 mm). Due to the frictional force with the platen 5 during the opening and closing operation of the platen, the portion A in the figure is U-shaped to prevent the platen spacer 9 from shifting in the direction of the printing element 10 (in this figure, the left-right direction with respect to the paper surface). It is bent. Further, by fixing the platen spacer 9 to the paper feed frame 8 with a temporary fixing tape, it is possible to prevent displacement in the girder direction (vertical direction with respect to the paper surface in this figure) and not to be easily removed. (This temporary fixing tape itself can be removed relatively easily).
[0015]
Part B is closely bent and can be pulled out above the platen 5. When the platen spacer 9 is actually pulled upward, the platen 5 is pressed downward by the leaf spring 7, so that the tightly bent portion (B portion) which is a weak portion extends as shown in FIG. When pulled further, the portion sandwiched between the platens 5 was removed, and the paper feeding mechanism 4 could be completely removed.
[0016]
In the present invention, the platen spacer 9 is used alone. However, as long as δ2> 0 is satisfied, the life of the platen 5 can be further extended by using a plurality of the platen spacers 9 in a stacked manner. .
[0017]
【The invention's effect】
According to the present invention, since the contact point between the printing element and the platen striking surface can be changed by removing the platen position adjusting means, the print quality can be maintained without replacing the platen, and the life of the platen can be extended. realizable.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of a paper feed mechanism unit of a dot printer according to the present invention.
FIG. 2 is a diagram illustrating an example of a paper feed mechanism unit of a conventional dot printer.
FIG. 3 is a diagram showing a striking position by a printing element on a platen striking surface viewed from the printing element side of the dot printer according to the present invention.
FIG. 4 is a diagram showing an example of the shape of platen position adjusting means of a dot printer according to the present invention.
FIG. 5 is an explanatory diagram of a shape change when the platen position adjusting unit of the dot printer shown in FIG. 4 is extracted.
[Explanation of symbols]
1 is a hammer bank, 2 is an ink ribbon, 3 is printing paper, 5 is a platen, 6 is a platen striking surface, 7 is a spring force generating means, 9 is a platen position adjusting means, and 10 is a printing element.

Claims (4)

複数個の印字素子を搭載したハンマバンクと、前記ハンマバンクを往復移動させる為のシャトル機構と、印字用紙の搬送方向に設けたペーパーガイドと、前記印字素子の印字力を保持する打撃面がフラットで印字用紙に対して直角方向に開閉動作ができ、バネ力発生手段によって下方に押しつけられて上下方向の位置決めがなされているプラテンと、前記印字用紙を搬送する少なくとも1対のトラクタとを有し、前記印字素子と前記プラテンの間に前記印字用紙とインクリボンを配置して前記ハンマバンクの往復運動の過程で前記印字素子を適時駆動することで前記印字用紙に文字、図形等を印字するドットプリンタにおいて、前記プラテンの下に薄板形状のプラテン位置調整手段を設けたことを特徴としたドットプリンタ。A hammer bank equipped with a plurality of printing elements, a shuttle mechanism for reciprocating the hammer bank, a paper guide provided in the printing paper conveyance direction, and a striking surface for holding the printing force of the printing elements are flat. And a platen that can be opened and closed in a direction perpendicular to the printing paper, is pressed downward by a spring force generating means, and is positioned in the vertical direction, and at least a pair of tractors that convey the printing paper. The printing paper and the ink ribbon are arranged between the printing element and the platen, and dots are printed on the printing paper by driving the printing element in a timely manner in the reciprocating motion of the hammer bank. A dot printer, characterized in that a thin plate-shaped platen position adjusting means is provided under the platen. 前記プラテン位置調整手段は、一方向に力を加えることで前記プラテンから引き抜き可能であることを特徴とした請求項1記載のドットプリンタ。2. The dot printer according to claim 1, wherein the platen position adjusting means can be pulled out from the platen by applying a force in one direction. 前記プラテン位置調整手段は、前記印字用紙と前記プラテンの距離が変化する方向に動作するプラテン開閉動作時においても、前記プラテンの摩擦力によって設定位置を外れる事の無いように折り曲げ部を有している事を特徴とした請求項1記載のドットプリンタ。The platen position adjusting means has a bent portion so as not to deviate from the set position due to the frictional force of the platen even during the platen opening / closing operation that operates in the direction in which the distance between the printing paper and the platen changes. The dot printer according to claim 1, wherein: 前記プラテン位置調整手段は、前記プラテンの開閉動作による摩擦に対して耐摩耗性のある材料で製作されている事を特徴とした請求項1記載のドットプリンタ。The dot printer according to claim 1, wherein the platen position adjusting means is made of a material that is resistant to friction caused by the opening and closing operation of the platen.
JP2002150771A 2002-05-24 2002-05-24 Dot printer Expired - Fee Related JP3904070B2 (en)

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