JP3992892B2 - Printer paper feed / discharge mechanism - Google Patents

Printer paper feed / discharge mechanism Download PDF

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Publication number
JP3992892B2
JP3992892B2 JP33739699A JP33739699A JP3992892B2 JP 3992892 B2 JP3992892 B2 JP 3992892B2 JP 33739699 A JP33739699 A JP 33739699A JP 33739699 A JP33739699 A JP 33739699A JP 3992892 B2 JP3992892 B2 JP 3992892B2
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Prior art keywords
recording medium
paper
roller
discharge
feeding
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JP2001151423A5 (en
JP2001151423A (en
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光男 対馬
栄彬 瀬津
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Alps Alpine Co Ltd
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Alps Electric Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明はプリンタの給排紙機構に係わり、1個の搬送ローラで給排紙が可能なプリンタの給排紙機構に関する。
【0002】
【従来の技術】
従来の図示を省略したプリンタの給排紙機構は、用紙トレー内に複数の記録用紙を載置した状態で昇降可能なプレッシャプレートを有し、このプレッシャプレートを昇降させて記録用紙を上方の給紙ローラに圧接する。
そして、給紙ローラを回転させて最上部の記録用紙を、用紙搬送方向の下流側の紙送りローラと小ローラとの間に搬送して、記録用紙は紙送りローラと小ローラとに圧接狭持されるようになっている。
【0003】
そして、プリンタが、例えばサーマルプリンタの場合には、紙送りローラの回転で、紙送りローラの下流側に設けられた印刷手段であるプラテンとサーマルヘッドとの間に記録用紙を給紙するようになっている。
前記印刷手段の用紙搬送方向の下流側には、印刷後の記録用紙をプリンタ外部に排紙可能な排紙ローラが配設されている。
【0004】
また、紙送りローラと小ローラとに記録用紙を圧接狭持すると、紙送りローラの正転、あるいは逆転により、記録用紙を用紙搬送方向の上流側、あるいは下流側に搬送可能になっており、印刷終了後の記録用紙は、紙送りローラにより下流側の排紙ローラに搬送される。
そして、記録用紙の後端部が紙送りローラと小ローラとの圧接から外れると、印刷後の記録用紙は、排紙ローラの回転で、プリンタ外部に排紙される。
【0005】
【発明が解決しようとする課題】
しかし、前述のような従来のプリンタの給排紙機構は、給紙ローラ、及び排紙ローラの2つのローラで記録用紙を給紙、及び排紙を行っていたので、部品点数が多くなりコストアップになっていた。
また、従来のプリンタの給排紙機構は、印刷手段の記録用紙搬送方向の上流側に給紙ローラを配置し、また、印刷手段の記録用紙搬送方向の下流側に排紙ローラを配置していたので、用紙搬送方向の奥行き寸法が大きくなってプリンタが大型になるという問題があった。
本発明は、前述したような問題点に鑑みてなされたもので、部品点数を少なくすると共に、小型化が可能なプリンタの給排紙機構を提供することを目的とする。
【0006】
【課題を解決するための手段】
前記課題を解決するための第1の手段として本発明のプリンタの給排紙機構はは、用紙トレーに収納された記録媒体を印刷手段側へ搬送可能な搬送ローラを備え、この搬送ローラは、前記用紙トレーの内側に配置されて前記記録媒体に接触し、かつ同方向の回転により、前記記録媒体を前記印刷手段側に給紙する給紙動作と、印刷後の前記記録媒体を前記給紙動作時の搬送方向と反対方向に搬送し、前記搬送ローラに接触して前記同方向に回転させて前記用紙トレーの上部に排紙する排紙動作とを可能にし、用紙トレー内部に収納した前記記録媒体を排出可能な排出部を前記用紙トレーに設けると共に、前記排出部の上部に前記排出部を開閉可能なガイド板を設け、前記給紙動作時には、前記ガイド板の上方への移動で、前記排出部を開いて、前記ガイド板の下方を前記記録媒体が通過可能とし、前記排紙動作時には、前記ガイド板の下方への移動で、前記排出部を閉じて、前記印刷後の前記記録媒体が前記ガイド板の上方を通過可能とし、前記記録媒体は、前記給紙動作及び前記排紙動作のそれぞれにおいて、前記搬送ローラに圧接して搬送される構成とした。
【0007】
また、前記課題を解決するための第2の手段として、前記記録媒体は、用紙トレーに収納されると共に、前記用紙トレー内部に設けられた昇降可能なプレッシャプレートに載置され、このプレッシャプレートが上昇時には、前記記録媒体が前記搬送ローラの下部に圧接して前記記給紙動作を可能とし、前記プレッシャプレートが降下時には、前記プレッシャプレート上の前記記録媒体が前記搬送ローラから離間して、前記搬送ローラの回転が前記プレッシャプレート上の前記記録媒体に伝わらないようにして前記排紙動作を可能とした構成とした。
【0008】
また、前記課題を解決するための第3の手段として、前記搬送ローラと前記印刷手段との間には、前記記録媒体を圧接狭持可能な紙送りローラと圧接ローラとを有し、前記給紙動作により給紙された前記記録媒体を圧接狭持した前記紙送りローラと前記圧接ローラとを回転させて前記印刷手段に給紙可能とし、印刷後の前記記録媒体を、前記紙送りローラを逆転させて前記搬送ローラの上方に戻し、前記搬送ローラを前記給紙動作時と同方向に回転させて、前記排紙動作を行うような構成とした。
【0010】
【発明の実施の形態】
以下、本発明のプリンタの給排紙機構を、例えば熱転写プリンタに用いたものを、図1〜図3に基づいて説明する。まず、図1は本発明に係わる搬送ローラによる給紙動作を示す要部断面図であり、図2は本発明に係わるガイド板の昇降動作を示す要部断面図であり、図3は本発明に係わる排紙動作を示す要部断面図である。
本図1に示すように、発明のプリンタの給排紙機構は、大きさが所定サイズの記録媒体1が複数枚用紙トレー2に収納されると共に、用紙トレー2内部に設けられた昇降可能な平板状のプレッシャープレート3上に記録媒体1が載置されている。
また、用紙トレー2は、プリンタ本体部(図示せず)に着脱可能になっており、プレッシャープレート3は、一方側に形成された支点3aを回動中心として、常に矢印Aの上方に弾性付勢されており、降下手段(図示せず)によって、他方側が矢印Bの下方に降下可能になっている。
【0011】
前記用紙トレー2の図示右側の側壁2a上部には、内部に収納した記録媒体1の幅寸法より若干広めに形成された溝状の排出部2bが設けられ、この排出部2bから内部の記録媒体1が外部に排出可能になっている。
また、プリンタ本体部に装着した用紙トレー2のプレッシャプレート3の他方側上部には、矢印L方向に回転可能な搬送ローラ4が配設されている。この搬送ローラ4は、円筒状で外周部がゴム等の摩擦抵抗の大きな部材で形成されている。
前記プレッシャプレート3が矢印Aの上方に上昇時には、プレッシャプレート3上に載置している記録媒体1の上面が搬送ローラ4の下部に圧接する。
この状態で、搬送ローラ4の矢印L方向への回転により、最上部の記録媒体1が分離されて、矢印Cの搬送方向に搬送可能になっている。
【0012】
前記搬送ローラ4により、印刷時に記録媒体1を後述する印刷手段8側に搬送する給紙動作と、印刷後の記録媒体1を矢印Cの搬送方向と反対方向に戻し、この戻された記録媒体1をプリンタ外部、またはプリンタ本体部(図示せず)に設けられた排紙部に排紙する排紙動作とが可能になっている。
また、搬送ローラ4の回転中心には、ガイド板5が軸支されており、このガイド板5は、搬送ローラ4とは独立して回動可能になっている。前記ガイド板5は、用紙トレー2の排出部2b方向に延びる舌片状の仕切片5aを有し、この仕切片5aが用紙トレー2の排出部2bの上部に位置して、排出部2bが開閉可能になっている。
【0013】
そして、搬送ローラ4を回転させて、記録媒体1を用紙搬送方向Cの下流側に搬送する給紙動作時は、仕切片5aの上方への移動で排出部2bが開かれ、ガイド板5の下方を記録媒体1が通過可能となっている。
前記上方に移動させた仕切片5aは、後述するリボンカセット12のリボン収納部12bの湾曲した下面がストッパとなった、それ以上上方に移動しないようになっている。
また、ガイド板5は、前記給紙動作中以外は、図2に示すように、仕切片5aが下方に移動して、排出部2bが閉じられるようになっている。
【0014】
前記用紙トレー2の矢印Cの搬送方向の下流側で、搬送ローラ4と後述する印刷手段8との間には、搬送ローラ4の給紙動作により給紙されてくる記録媒体1を圧接狭持可能な紙送りローラ6と圧接ローラ7とが配設されている。
そして、圧接狭持した記録媒体1は、紙送りローラ6の時計回り方向への回転により、下流側の印刷手段8に給紙可能になっている。前記紙送りローラ6は、時計回り方向、及び反時計回り方向の両方向に回転可能になっており、紙送りローラ6の回転に追従して圧接ローラ7が回転自在になっている。
【0015】
また、記録媒体1の前端部を紙送りローラ6と圧接ローラ7とで圧接狭持すると、プレッシャプレート3は、降下手段(図示せず)の作用で、矢印Bの下方に降下するようになっている。
そして、プレッシャプレート3が降下時には、用紙トレー2に収納している記録媒体1が搬送ローラ4から離間して、搬送ローラ4の回転がプレッシャプレート上の記録媒体1に伝わらないようになっている。
【0016】
また、紙送りローラ6と圧接ローラ7の矢印Cの搬送方向の下流側には印刷手段8が配設されている。この印刷手段8は、記録媒体1の幅寸法より幅広に形成された円柱状で回転可能なプラテンローラ9と、このプラテンローラ9の上方にヘッドアップ・ダウン可能なラインサーマルヘッド10が配設されて構成されている。前記ラインサーマルヘッド10は、記録媒体1の幅寸法と略同程度の広さに形成され、プラテンローラ9に沿って複数の発熱素子(図示せず)が形成されている。
【0017】
前記プラテンローラ9とラインサーマルヘッド10との間には、記録媒体1の幅寸法と略同程度の幅寸法に形成された、シート状のインクリボン11が位置するようになっている。
前記インクリボン11は、2つのリボン収納部12a、12bを有するリボンカセット12に収納され、両端部が巻取りリール13と供給リール14とにそれぞれ巻回されている。そして、巻取りリール13と供給リール14とを、プリンタ本体部側の巻取りボビン(図示せず)と供給ボビン(図示せず)とにそれぞれ係合させて、巻取りボビンの回転により巻取りリール13を回転させることにより、供給リール14に巻回したインクリボン11を巻取り可能になっている。
【0018】
また、印刷手段8による印刷動作は、プラテンローラ9とラインサーマルヘッド10との間に記録媒体1を給紙して、図2に示すように、ラインサーマルヘッド10をプラテンローラ9にヘッドダウンさせ、ラインサーマルヘッド10に形成している複数の発熱素子(図示せず)を印刷情報に従って選択的に発熱させながら、プラテンローラ9を時計回り方向に回転させると、記録媒体1が矢印Cの搬送方向に搬送されると共に、記録媒体1にインクリボン11のインクが転写され、記録媒体1に所望の画像を印刷することができる。
【0019】
前記記録媒体1への所望の画像の印刷が終了すると、記録媒体1の後端部1aが用紙トレー2の排出部2bから外れ、同時に図2に示すように、ガイド板5の仕切片5aが下方に移動して、排出部2bが閉じられる。そして、仕切片5aとリボンカセット12のリボン収納部12bの湾曲状の下面との間に隙間15が形成される。
即ち、ガイド板5の下方への移動で、排出部2bを閉じて、印刷後の記録媒体1がガイド板5の上方の隙間部15を通過可能になっている。
【0020】
このような本発明のプリンタの給排紙機構の動作を説明すると、まず、リボンカセット12をプリンタ本体部(図示せず)の図示を省略する巻取りボビンと供給ボビンとに、巻取りリール13と供給リール14とを係合させると共に、リボンカセット12から外部に引き回しされたインクリボン11を、プラテンローラ9とサーマルヘッド10との間に位置させて、リボンカセット12をプリンタ本体部に装着する。
【0021】
次に、複数の記録媒体1を収納した用紙トレー2のプレッシャプレート3を矢印A方向に上昇させて、記録媒体1を上方の搬送ローラ4に圧接する。
この時、ガイド板5は、仕切片5aが上方に移動して、用紙トレー2の排出部2bが開かれた状態になっている。
次に、搬送ローラ4を矢印L方向に回転させて給紙動作を開始すると、プレッシャプレート3上の最上部の記録媒体1が下部の記録媒体1と分離されて、記録媒体1が矢印Cの搬送方向に搬送される。
そして、矢印Cの搬送方向に搬送される記録媒体1は、排出部2bから下流側の紙送りローラ6と圧接ローラ7に搬送されて、記録媒体1の前端部が紙送りローラ6と圧接ローラ7とに圧接狭持される。
すると、用紙トレー2のプレッシャプレート3が下方に降下し、プレッシャプレート3上に載置された記録媒体1は搬送ローラ4から離間して、搬送ローラ4の回転が、プレッシャプレート3上の記録媒体1に伝達されない。
【0022】
次に、記録媒体1を圧接狭持した状態の紙送りローラ6を時計回り方向に回転させて、下流側のプラテンローラ9と、インクリボン1が引き回しされたラインサーマルヘッド10の間に記録媒体1を給紙する。
そして、ラインサーマルヘッド10をヘッドダウンさせ、印刷情報に従って発熱素子を選択的に発熱させながら、プラテンローラ9を時計回り方向に回転させて、記録媒体1を搬送方向の下流側に搬送する。
それと同時に、印刷後のインクリボン11を巻取りリール13に巻取ることにより、新しいインクリボン11が供給リール14から供給されて、記録媒体1に所望の画像が印刷される。
前記記録媒体1に所望の画像を印刷後、記録媒体1の後端部1aが用紙トレー2の排出部2bから外れると、ガイド板5の下方への回動により、仕切片5aが下方に移動して用紙トレー2の排出部2bが閉じられ、仕切片5aとリボンカセット12のリボン収納部12b下面との間に隙間部15が形成される。
【0023】
次に、紙送りローラ9を反時計回り方向に逆転させて、印刷後の記録媒体1を、矢印Cの搬送方向と反対方向(矢印D)に搬送し、記録媒体1の後端部1aを搬送ローラの上部側に戻す。
そして、図3に示すように、記録媒体1を矢印D方向に戻す動作で、記録媒体1は、隙間部15を移動する。この隙間部15を矢印D方向に移動する記録媒体1は、後端部1aがガイド板5の上面に沿って搬送ローラ4の上部に移動すると共に、リボンカセット12のリボン収納部12aの下面に当接して若干折り曲げられる。
そのために、記録媒体1は元の平坦状に戻ろうとする復元力が働き、搬送ローラ4の上部に記録媒体1の下面が押圧されて、搬送ローラ4と記録媒体1とに摩擦抵抗が生じる。
【0024】
そして、紙送りローラ6と圧接ローラ6との圧接狭持が外れた記録媒体1は、搬送ローラ4の給紙動作時と同方向の矢印L方向の回転で、印刷後の記録媒体1を矢印D方向に排紙する排紙動作が行われる前記搬送ローラ4の排紙動作で、印刷後の記録媒体1は、プリンタ外部、あるいはプリンタ本体部に設けられた排紙部(図示せず)に排紙される。
【0025】
即ち、本発明は、搬送ローラ4により、印刷時に記録媒体1を印刷手段8側に給紙する給紙動作と、印刷後の記録媒体1を矢印Cの搬送方向と反対方向(矢印D)に戻し、この戻された記録媒体1を排紙する排紙動作とを可能にしたので、1つの搬送ローラ4で、給紙動作と排紙動作とを兼用することができるようになっている。
【0026】
【発明の効果】
以上述べたように、本発明のプリンタの給排紙機構は、搬送ローラにより、印刷時に記録媒体を印刷手段側に給紙する給紙動作と、印刷後の記録媒体を搬送方向と反対方向に戻し、この戻された記録媒体を排紙する排紙動作とを可能にしたので、1つの搬送ローラで給紙動作と排紙動作とを兼用することができ、部品点数の少ないプリンタの給排紙機構を提供できる。
また、1つの搬送ローラで給紙動作と排紙動作とを兼用することで、プリンタ本体部の奥行き寸法を小さくすることができ、小型が可能なプリンタの給排紙機構を提供できる。
【0027】
また、プレッシャプレートが上昇時には、前記プレッシャプレート上の前記記録媒体が前記搬送ローラの下部に圧接して前記搬送ローラの回転が前記記録媒体に伝達されて前記記給紙動作を可能とし、前記プレッシャプレートが降下時には、前記プレッシャプレート上の前記記録媒体が前記搬送ローラから離間して、前記搬送ローラの回転が前記プレッシャプレート上の前記記録媒体に伝わらないようにして前記排紙動作を可能としたので、給紙動作時には、プレッシャプレート上の最上部の記録媒体を分離して確実に印刷手段側に給紙することができ、排紙動作時には、プレッシャプレート上の記録媒体を搬送ローラから離間させることによって、誤給紙等による障害を防ぐことができる。
【0028】
また、印刷後の記録媒体を、紙送りローラを逆転させて搬送ローラの上方に戻し、搬送ローラを給紙動作時と同方向に回転させて、前記排紙動作を行うようにしたので、1つの搬送ローラで給紙動作と排紙動作とを兼用することができ、部品点数を少なくすることができる。
【0029】
また、給紙動作時は、ガイド板の上方への移動で、排出部を開いて、ガイド板の下方を記録媒体が通過可能とし、排紙動作時は、ガイド板の下方への移動で、排出部を閉じて、印刷後の記録媒体がガイド板の上方を通過可能としたので、1つの搬送ローラで、確実に給紙動作と排紙動作とを行うことができるプリンタの給排紙機構を提供できる。
【図面の簡単な説明】
【図1】本発明に係わる搬送ローラによる給紙動作を示す要部断面図である。
【図2】本発明に係わるガイド板の昇降動作を示す要部断面図である。
【図3】本発明に係わる排紙動作を示す要部断面図である。
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper supply / discharge mechanism of a printer, and more particularly to a paper supply / discharge mechanism of a printer that can supply and discharge paper with a single transport roller.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a printer paper supply / discharge mechanism (not shown) has a pressure plate that can be raised and lowered while a plurality of recording papers are placed in a paper tray. The pressure plate is raised and lowered to feed the recording paper upward. Press against the paper roller.
Then, by rotating the paper feed roller, the uppermost recording paper is conveyed between the paper feeding roller and the small roller on the downstream side in the paper conveying direction, and the recording paper is pressed against the paper feeding roller and the small roller. It is supposed to be held.
[0003]
When the printer is a thermal printer, for example, the recording paper is fed between the platen and the thermal head, which is printing means provided downstream of the paper feed roller, by the rotation of the paper feed roller. It has become.
A paper discharge roller capable of discharging the printed recording paper to the outside of the printer is disposed downstream of the printing unit in the paper transport direction.
[0004]
In addition, when the recording paper is pressed and sandwiched between the paper feed roller and the small roller, the recording paper can be conveyed upstream or downstream in the paper conveyance direction by forward rotation or reverse rotation of the paper feed roller. The recording sheet after printing is conveyed to a downstream discharge roller by a paper feed roller.
When the trailing edge of the recording paper comes out of the pressure contact between the paper feed roller and the small roller, the printed recording paper is discharged outside the printer by the rotation of the paper discharge roller.
[0005]
[Problems to be solved by the invention]
However, since the conventional printer paper supply / discharge mechanism as described above feeds and discharges recording paper with two rollers, the paper supply roller and the paper discharge roller, the number of parts increases and the cost increases. It was up.
Further, the conventional printer paper supply / discharge mechanism has a paper feed roller disposed upstream of the printing means in the recording paper transport direction, and a paper discharge roller disposed downstream of the printing means in the recording paper transport direction. Therefore, there has been a problem that the depth dimension in the paper transport direction becomes large and the printer becomes large.
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a printer paper supply / discharge mechanism that can reduce the number of components and can be miniaturized.
[0006]
[Means for Solving the Problems]
As a first means for solving the above problems, a paper feed / discharge mechanism of a printer of the present invention includes a transport roller capable of transporting a recording medium stored in a paper tray to a printing means side, and the transport roller includes: A paper feed operation that is arranged inside the paper tray and contacts the recording medium and rotates in the same direction to feed the recording medium to the printing means side, and the recording medium after printing is fed to the paper The paper is transported in a direction opposite to the transport direction during operation, and is allowed to perform a paper discharge operation in which the paper is in contact with the transport roller and rotated in the same direction so as to be discharged onto the top of the paper tray. A discharge unit capable of discharging the recording medium is provided in the paper tray, and a guide plate capable of opening and closing the discharge unit is provided above the discharge unit, and during the paper feeding operation, the guide plate is moved upward. Open the discharge part The recording medium can pass under the guide plate, and during the paper discharge operation, the discharge portion is closed by the downward movement of the guide plate, and the recording medium after printing is placed above the guide plate. and can pass through, said recording medium, in each of the feeding operation及beauty before Symbol discharging operation was configured to be conveyed in pressure contact with the conveying roller.
[0007]
Further, as a second means for solving the above-mentioned problem, the recording medium is housed in a paper tray and is placed on a pressure plate which can be moved up and down provided in the paper tray. When the recording medium is raised, the recording medium is pressed against the lower part of the conveying roller to enable the recording paper feeding operation.When the pressure plate is lowered, the recording medium on the pressure plate is separated from the conveying roller, and The paper discharge operation is made possible by preventing the rotation of the conveying roller from being transmitted to the recording medium on the pressure plate.
[0008]
Further, as a third means for solving the above problem, a paper feed roller and a pressure contact roller capable of pressing and sandwiching the recording medium are provided between the transport roller and the printing means. The paper feed roller that press-clamps the recording medium fed by paper operation and the pressure roller can be rotated to feed the printing means, and the recording medium after printing can be fed to the paper feed roller. The paper is returned to the upper side of the transport roller, and the transport roller is rotated in the same direction as in the paper feeding operation to perform the paper discharge operation.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
In the following, the printer paper supply / discharge mechanism used in a thermal transfer printer, for example, will be described with reference to FIGS. First, FIG. 1 is a cross-sectional view of a main part showing a paper feeding operation by a conveying roller according to the present invention, FIG. 2 is a cross-sectional view of a main part showing a lifting operation of a guide plate according to the present invention, and FIG. It is principal part sectional drawing which shows the paper discharge operation | movement concerning.
As shown in FIG. 1, the paper feeding / discharging mechanism of the printer of the invention is configured such that a recording medium 1 having a predetermined size is stored in a plurality of paper trays 2 and can be moved up and down provided in the paper trays 2. A recording medium 1 is placed on a flat pressure plate 3.
The paper tray 2 can be attached to and detached from a printer main body (not shown), and the pressure plate 3 is elastically attached above the arrow A with a fulcrum 3a formed on one side as a rotation center. The other side can be lowered below the arrow B by lowering means (not shown).
[0011]
A groove-shaped discharge portion 2b formed slightly wider than the width dimension of the recording medium 1 accommodated therein is provided on the right side wall 2a of the paper tray 2 in the drawing, and the internal recording medium is provided from the discharge portion 2b. 1 can be discharged to the outside.
A transport roller 4 that is rotatable in the direction of arrow L is disposed on the other side of the pressure plate 3 of the paper tray 2 mounted on the printer main body. The transport roller 4 has a cylindrical shape and an outer peripheral portion formed of a member having a large frictional resistance such as rubber.
When the pressure plate 3 is raised above the arrow A, the upper surface of the recording medium 1 placed on the pressure plate 3 is pressed against the lower portion of the conveying roller 4.
In this state, the uppermost recording medium 1 is separated by the rotation of the conveying roller 4 in the arrow L direction, and can be conveyed in the conveying direction of the arrow C.
[0012]
The feeding roller 4 feeds the recording medium 1 to the printing means 8 (to be described later) during printing, and returns the printed recording medium 1 to the direction opposite to the conveying direction of the arrow C. A paper discharge operation for discharging 1 to a paper discharge portion provided outside the printer or in a printer main body (not shown) is possible.
A guide plate 5 is pivotally supported at the center of rotation of the transport roller 4, and the guide plate 5 can be rotated independently of the transport roller 4. The guide plate 5 has a tongue-like partition piece 5a extending in the direction of the discharge portion 2b of the paper tray 2, and the partition piece 5a is positioned above the discharge portion 2b of the paper tray 2 so that the discharge portion 2b It can be opened and closed.
[0013]
When the feeding roller 4 is rotated to feed the recording medium 1 downstream in the paper feeding direction C, the discharge unit 2b is opened by the upward movement of the partition piece 5a, and the guide plate 5 The recording medium 1 can pass below.
The partition piece 5a moved upward is prevented from moving further upward with a curved lower surface of a ribbon storage portion 12b of the ribbon cassette 12 described later serving as a stopper.
Further, as shown in FIG. 2, the guide plate 5 is configured such that the partition piece 5a moves downward and the discharge portion 2b is closed, except during the paper feeding operation.
[0014]
On the downstream side of the sheet tray 2 in the conveying direction of the arrow C, the recording medium 1 fed by the feeding operation of the conveying roller 4 is pressed and sandwiched between the conveying roller 4 and a printing unit 8 described later. A possible paper feed roller 6 and a pressure roller 7 are provided.
The recording medium 1 sandwiched between the pressure contacts can be fed to the printing means 8 on the downstream side by the clockwise rotation of the paper feed roller 6. The paper feed roller 6 is rotatable in both the clockwise direction and the counterclockwise direction, and the pressure contact roller 7 is rotatable following the rotation of the paper feed roller 6.
[0015]
Further, when the front end portion of the recording medium 1 is nipped by the paper feed roller 6 and the pressure roller 7, the pressure plate 3 is lowered below the arrow B by the action of the lowering means (not shown). ing.
When the pressure plate 3 is lowered, the recording medium 1 stored in the paper tray 2 is separated from the conveyance roller 4 so that the rotation of the conveyance roller 4 is not transmitted to the recording medium 1 on the pressure plate. .
[0016]
A printing unit 8 is disposed on the downstream side of the paper feed roller 6 and the pressure roller 7 in the conveyance direction of the arrow C. This printing means 8 is provided with a cylindrical platen roller 9 formed wider than the width of the recording medium 1 and rotatable, and a line thermal head 10 that can be headed up and down above the platen roller 9. Configured. The line thermal head 10 is formed to be approximately as wide as the width dimension of the recording medium 1, and a plurality of heating elements (not shown) are formed along the platen roller 9.
[0017]
Between the platen roller 9 and the line thermal head 10, a sheet-like ink ribbon 11 formed in a width dimension substantially the same as the width dimension of the recording medium 1 is positioned.
The ink ribbon 11 is stored in a ribbon cassette 12 having two ribbon storage portions 12a and 12b, and both ends are wound around a take-up reel 13 and a supply reel 14, respectively. Then, the take-up reel 13 and the supply reel 14 are respectively engaged with a take-up bobbin (not shown) and a supply bobbin (not shown) on the printer main body side, and the take-up bobbin rotates to take up. By rotating the reel 13, the ink ribbon 11 wound around the supply reel 14 can be taken up.
[0018]
In the printing operation by the printing means 8, the recording medium 1 is fed between the platen roller 9 and the line thermal head 10, and the line thermal head 10 is lowered to the platen roller 9 as shown in FIG. When the platen roller 9 is rotated clockwise while the plurality of heating elements (not shown) formed on the line thermal head 10 are selectively heated according to the printing information, the recording medium 1 is conveyed in the direction indicated by the arrow C. In addition, the ink on the ink ribbon 11 is transferred to the recording medium 1 and a desired image can be printed on the recording medium 1.
[0019]
When the printing of the desired image on the recording medium 1 is completed, the rear end 1a of the recording medium 1 is detached from the discharge portion 2b of the paper tray 2, and at the same time, as shown in FIG. The discharge part 2b is closed by moving downward. And the clearance gap 15 is formed between the partition piece 5a and the curved lower surface of the ribbon accommodating part 12b of the ribbon cassette 12. FIG.
That is, by moving the guide plate 5 downward, the discharge portion 2 b is closed, and the recording medium 1 after printing can pass through the gap 15 above the guide plate 5.
[0020]
The operation of the paper supply / discharge mechanism of the printer according to the present invention will be described. First, the ribbon cassette 12 is placed on a take-up bobbin and a supply bobbin (not shown) of a printer main body (not shown), and a take-up reel 13. And the supply reel 14 are engaged, and the ink ribbon 11 drawn out from the ribbon cassette 12 is positioned between the platen roller 9 and the thermal head 10, and the ribbon cassette 12 is attached to the printer main body. .
[0021]
Next, the pressure plate 3 of the paper tray 2 containing the plurality of recording media 1 is raised in the direction of arrow A, and the recording medium 1 is pressed against the upper conveying roller 4.
At this time, the guide plate 5 is in a state in which the partition piece 5a moves upward and the discharge portion 2b of the paper tray 2 is opened.
Next, when the feeding roller 4 is rotated in the direction of the arrow L to start the paper feeding operation, the uppermost recording medium 1 on the pressure plate 3 is separated from the lower recording medium 1, and the recording medium 1 is moved to the direction indicated by the arrow C. It is transported in the transport direction.
Then, the recording medium 1 conveyed in the conveyance direction indicated by the arrow C is conveyed from the discharge portion 2b to the paper feeding roller 6 and the pressure roller 7 on the downstream side, and the front end portion of the recording medium 1 is the paper feeding roller 6 and the pressure roller. 7 is held in pressure contact.
Then, the pressure plate 3 of the paper tray 2 descends downward, the recording medium 1 placed on the pressure plate 3 is separated from the conveying roller 4, and the rotation of the conveying roller 4 causes the recording medium on the pressure plate 3 to rotate. 1 is not transmitted.
[0022]
Next, the paper feeding roller 6 with the recording medium 1 held in pressure contact is rotated in the clockwise direction so that the recording medium is interposed between the downstream platen roller 9 and the line thermal head 10 on which the ink ribbon 1 is drawn. 1 is fed.
Then, the line thermal head 10 is lowered, and the platen roller 9 is rotated in the clockwise direction while the heating element is selectively heated according to the printing information, and the recording medium 1 is conveyed downstream in the conveying direction.
At the same time, by winding the printed ink ribbon 11 on the take-up reel 13, a new ink ribbon 11 is supplied from the supply reel 14 and a desired image is printed on the recording medium 1.
After the desired image is printed on the recording medium 1, when the rear end 1a of the recording medium 1 is disengaged from the discharge portion 2b of the paper tray 2, the partition piece 5a is moved downward by the downward rotation of the guide plate 5. Thus, the discharge portion 2b of the paper tray 2 is closed, and a gap portion 15 is formed between the partition piece 5a and the lower surface of the ribbon storage portion 12b of the ribbon cassette 12.
[0023]
Next, the paper feeding roller 9 is reversed in the counterclockwise direction, and the recording medium 1 after printing is conveyed in the direction opposite to the conveying direction of the arrow C (arrow D), and the rear end 1a of the recording medium 1 is moved. Return to the upper side of the transport roller.
Then, as shown in FIG. 3, the recording medium 1 moves through the gap 15 by the operation of returning the recording medium 1 in the arrow D direction. In the recording medium 1 moving in the gap D direction in the gap portion 15, the rear end portion 1 a moves along the upper surface of the guide plate 5 to the upper portion of the conveying roller 4 and on the lower surface of the ribbon storage portion 12 a of the ribbon cassette 12. Slightly bent by contact.
For this reason, the recording medium 1 has a restoring force to return to the original flat state, the lower surface of the recording medium 1 is pressed on the upper part of the conveying roller 4, and a frictional resistance is generated between the conveying roller 4 and the recording medium 1.
[0024]
Then, the recording medium 1 in which the pressure contact between the paper feed roller 6 and the pressure roller 6 is released is rotated in the direction of the arrow L in the same direction as the feeding operation of the transport roller 4, and the recording medium 1 after printing is indicated by the arrow. A paper discharge operation for discharging in the D direction is performed . By the paper discharge operation of the transport roller 4, the printed recording medium 1 is discharged to a paper discharge portion (not shown) provided outside the printer or in the printer main body.
[0025]
That is, according to the present invention, the feeding roller 4 feeds the recording medium 1 to the printing means 8 side during printing, and the printed recording medium 1 is moved in the direction opposite to the conveying direction of arrow C (arrow D). Thus, the paper discharge operation for discharging the returned recording medium 1 is made possible, so that the single feeding roller 4 can be used for both the paper supply operation and the paper discharge operation.
[0026]
【The invention's effect】
As described above, the paper supply / discharge mechanism of the printer of the present invention has the paper feeding operation for feeding the recording medium to the printing means side during printing by the conveyance roller and the recording medium after printing in the direction opposite to the conveyance direction. Since the paper ejection operation for ejecting the returned recording medium is possible, it is possible to use both the paper feeding operation and the paper ejection operation with a single transport roller. A paper mechanism can be provided.
Further, by combining the paper feeding operation and the paper discharge operation with one transport roller, the depth of the printer main body can be reduced, and a printer paper supply / discharge mechanism capable of being miniaturized can be provided.
[0027]
When the pressure plate is raised, the recording medium on the pressure plate is pressed against the lower part of the conveying roller, and the rotation of the conveying roller is transmitted to the recording medium to enable the recording and feeding operation. When the plate is lowered, the recording medium on the pressure plate is separated from the conveyance roller, and the discharge operation is enabled so that the rotation of the conveyance roller is not transmitted to the recording medium on the pressure plate. Thus, the uppermost recording medium on the pressure plate can be separated and reliably fed to the printing means side during the paper feeding operation, and the recording medium on the pressure plate is separated from the conveying roller during the paper ejection operation. Therefore, it is possible to prevent troubles due to erroneous paper feeding.
[0028]
In addition, the recording medium after printing is returned to the upper side of the transport roller by reversing the paper feed roller, and the transport roller is rotated in the same direction as that during the paper feeding operation so that the paper discharge operation is performed. A single feeding roller can be used for both the paper feeding operation and the paper ejection operation, and the number of parts can be reduced.
[0029]
Further, during the paper feeding operation, the guide plate is moved upward to open the discharge portion so that the recording medium can pass under the guide plate, and during the paper discharge operation, the guide plate is moved downward. The discharge section is closed, and the recording medium after printing can pass above the guide plate, so that the paper supply / discharge mechanism of the printer can reliably perform the paper supply operation and paper discharge operation with one transport roller. Can provide.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part showing a sheet feeding operation by a conveying roller according to the present invention.
FIG. 2 is a cross-sectional view of a main part showing a lifting operation of a guide plate according to the present invention.
FIG. 3 is a cross-sectional view of a main part showing a paper discharge operation according to the present invention.

Claims (3)

用紙トレーに収納された記録媒体を印刷手段側へ搬送可能な搬送ローラを備え、この搬送ローラは、前記用紙トレーの内側に配置されて前記記録媒体に接触し、かつ同方向の回転により、前記記録媒体を前記印刷手段側に給紙する給紙動作と、印刷後の前記記録媒体を前記給紙動作時の搬送方向と反対方向に搬送し、前記搬送ローラに接触して前記同方向に回転させて前記用紙トレーの上部に排紙する排紙動作とを可能にし、用紙トレー内部に収納した前記記録媒体を排出可能な排出部を前記用紙トレーに設けると共に、前記排出部の上部に前記排出部を開閉可能なガイド板を設け、前記給紙動作時には、前記ガイド板の上方への移動で、前記排出部を開いて、前記ガイド板の下方を前記記録媒体が通過可能とし、前記排紙動作時には、前記ガイド板の下方への移動で、前記排出部を閉じて、前記印刷後の前記記録媒体が前記ガイド板の上方を通過可能とし、前記記録媒体は、前記給紙動作及び前記排紙動作のそれぞれにおいて、前記搬送ローラに圧接して搬送されることを特徴とするプリンタの給排紙機構。A transport roller capable of transporting the recording medium stored in the paper tray to the printing means side, the transport roller being disposed inside the paper tray, contacting the recording medium, and rotating in the same direction; Feeding operation for feeding the recording medium to the printing means side, and transporting the recording medium after printing in a direction opposite to the transporting direction during the paper feeding operation, rotating in the same direction by contacting the transporting roller The paper tray can be discharged to the top of the paper tray, and the paper tray is provided with a discharge portion capable of discharging the recording medium stored in the paper tray, and the discharge is provided above the discharge portion. A guide plate that can be opened and closed. During the paper feeding operation, when the guide plate is moved upward, the discharge unit is opened so that the recording medium can pass under the guide plate. In operation, the In the downward movement of the id plate, closing the discharge portion, the recording medium after the printing is possible passes over the guide plate, wherein the recording medium, the feeding operation及beauty before Symbol discharging operation In each of the above , a paper feeding / discharging mechanism of the printer, wherein the paper feeding and discharging mechanism is conveyed while being pressed against the conveying roller . 前記記録媒体は、用紙トレーに収納されると共に、前記用紙トレー内部に設けられた昇降可能なプレッシャプレートに載置され、このプレッシャプレートの上昇時には、前記プレッシャプレート上の前記記録媒体が前記搬送ローラの下部に圧接して前記搬送ローラの回転が前記記録媒体に伝達されて前記給紙動作を可能とし、前記プレッシャプレートの降下時には、前記プレッシャプレート上の前記記録媒体が前記搬送ローラから離間して、前記搬送ローラの回転が前記プレッシャプレート上の前記記録媒体に伝わらないようにして前記排紙動作を可能としたことを特徴とする請求項1記載のプリンタの給排紙機構。  The recording medium is housed in a paper tray and placed on a pressure plate that can be raised and lowered provided inside the paper tray. When the pressure plate is raised, the recording medium on the pressure plate is moved to the transport roller. The rotation of the conveyance roller is transmitted to the recording medium by being pressed against the lower portion of the recording medium to enable the paper feeding operation. When the pressure plate is lowered, the recording medium on the pressure plate is separated from the conveyance roller. 2. The paper feed / discharge mechanism of a printer according to claim 1, wherein the paper discharge operation is made possible so that the rotation of the transport roller is not transmitted to the recording medium on the pressure plate. 前記搬送ローラと前記印刷手段との間には、前記記録媒体を圧接挟持可能な紙送りローラと圧接ローラとを有し、前記給紙動作により給紙された前記記録媒体を圧接挟持した前記紙送りローラと前記圧接ローラとを回転させて前記印刷手段に給紙可能とし、印刷後の前記記録媒体を、前記紙送りローラ逆転させて前記搬送ローラの上方に戻し、前記搬送ローラを前記給紙動作時と同方向に回転させて、前記排紙動作を行うようにしたことを特徴とする請求項2記載のプリンタの給排紙機構。  Between the transport roller and the printing unit, there is a paper feed roller and a pressure roller that can press-clamp the recording medium, and the paper that press-clamps the recording medium fed by the paper feeding operation The feeding roller and the pressure roller are rotated to enable feeding to the printing means, and the recording medium after printing is returned to the upper side of the conveying roller by reversing the paper feeding roller, and the conveying roller is fed to the feeding unit. 3. A paper feed / discharge mechanism of a printer according to claim 2, wherein said paper discharge operation is performed by rotating in the same direction as in operation.
JP33739699A 1999-11-29 1999-11-29 Printer paper feed / discharge mechanism Expired - Lifetime JP3992892B2 (en)

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