JP3816318B2 - Double-sided reading apparatus and image forming apparatus having the same - Google Patents

Double-sided reading apparatus and image forming apparatus having the same Download PDF

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JP3816318B2
JP3816318B2 JP2000235367A JP2000235367A JP3816318B2 JP 3816318 B2 JP3816318 B2 JP 3816318B2 JP 2000235367 A JP2000235367 A JP 2000235367A JP 2000235367 A JP2000235367 A JP 2000235367A JP 3816318 B2 JP3816318 B2 JP 3816318B2
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document
reading
conveying
image
double
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JP2002051196A (en
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淳一 谷川
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Ricoh Co Ltd
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Ricoh Co Ltd
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Description

【0001】
【発明の属する技術分野】
この発明は、原稿を搬送する原稿搬送路に設けた読取センサにより、その原稿搬送路を搬送される原稿の第1面と第2面の画像を読み取るようにした両面読取装置及びその両面読取装置を備えた画像形成装置に関する。
【0002】
【従来の技術】
従来の原稿の両面の画像をそれぞれ読み取り可能にする両面読取装置としては、例えば特開平10−207979号公報に記載されているものがある。
この両面読取装置は、給紙部にセットした帳票を供給部により読取部に搬送し、その読取部で帳票のまず表面の画像を光学的に走査して読み取り、その画像データをデジタル化してイメージバッファに格納する。
【0003】
そして、その表面の画像が走査された帳票は、第1の反転部に搬送された後に転てつ部を通って第2の反転部に搬送され、表裏が反転された状態で再び読取部に搬送される。そして、その読取部で今度は裏面の画像が光学的に走査され、その読み取った画像データをデジタル化してイメージバッファに格納するようにしている。
また、両面読取装置には、例えば特開平11−127350号公報に記載されているように、原稿搬送経路を挾んで表面白基準を読み取る表面工学ユニットと、裏面白基準を読み取る裏面工学ユニットとを配設したものもある。
【0004】
【発明が解決しようとする課題】
しかしながら、前者の両面読取装置の場合には、表面の画像を読み取った後の帳票を、第1の反転部から転てつ部を通して第2の反転部に搬送することにより表裏を反転させ、その後で裏面の画像の読み取り(走査)を行う構成であるため、その帳票を裏側に反転させるための第1の反転部と転てつ部と第2の反転部とが必要であるため、その分だけ搬送経路及び搬送駆動系が複雑になることによってコストアップになってしまうという問題点があった。
【0005】
また、その帳票を裏側に反転させる搬送経路のために、装置全体が大型化してしまうという問題点もあった。
さらに、このような表裏反転用の搬送経路を設ける構成では、帳票等の原稿がその搬送経路を通過するための時間が必要であるため、処理時間が多くかかってしまうという欠点もあった。
【0006】
また、後者の両面読取装置の場合には、読み取り用の工学ユニットを、原稿搬送経路を挾んで上側と下側の両方にそれぞれ設けるため、光学系が1つの場合に比べて2倍のコストがかかってしまうと共に、光学系を収納するためのスペースも2倍必要となるため、それだけ装置が大型化してしまうという問題点があった。
また、原稿の両面の画像の読取処理を略同時のタイミングで処理する構成であるため、エレキ,ソフトの処理スピードが高速となるため、その分コストアップになってしまうという問題点もあった。
【0007】
この発明は、上記の問題点に鑑みてなされたものであり、原稿を表裏反転させる反転経路を設けることなく、また1つの読取センサだけで表裏両面に画像のある両面原稿の両面の画像を読み取ることができるようにして、小型で低コストにすることを目的とする。
【0008】
【課題を解決するための手段】
この発明は上記の目的を達成するため、原稿を搬送する原稿搬送路に設けた読取センサにより、その原稿搬送路を搬送される原稿の第1面と第2面の画像を読み取るようにした両面読取装置において、
上記原稿搬送路に駆動源により回転される回転部材を設けると共に、その回転部材に上記原稿搬送路の一部を回転搬送路として一体に設け、上記回転部材に上記回転搬送路を通過中の原稿の一方の面の画像を読み取り可能に上記読取センサを取り付け、上記原稿搬送路の上記回転部材に対して原稿搬送順方向上流側に第1の搬送ローラを、原稿搬送順方向下流側に第2の搬送ローラをそれぞれ設けると共に、上記第1の搬送ローラと第2の搬送ローラをそれぞれローラ駆動源により正逆両方向に回転可能に設ける。
【0009】
また、正方向に回転させた上記第1の搬送ローラにより原稿搬送順方向に搬送される原稿の第1面の画像を上記読取センサにより読み取らせ、その原稿が正方向に回転させた上記第2の搬送ローラにより原稿搬送順方向に搬送されて後端が上記回転搬送路を抜けた後に上記駆動源を駆動させて上記回転部材を上記読取センサと共に180度回転させ、その後で上記第1の搬送ローラと第2の搬送ローラを共に逆方向に回転させて原稿を逆方向に搬送させ、その原稿の第2面の画像を上記読取センサにより読み取らせる手段を設ける。
【0011】
さらに、上記回転部材に設ける回転搬送路を、上記読取センサの読み取り側を覆う読取ガラスと、その読取ガラスに対して所定の間隔を置いて対向配置された読取基準ガイド板とにより構成し、上記読取ガラスの原稿搬送方向の全長を上記読取基準ガイド板の原稿搬送方向の全長に略一致させ、上記回転部材の回転中心を上記読取基準ガイド板の原稿搬送方向の中間位置にする
その場合、回転部材に読取ガラスの原稿に対向する面と反対の面側にその読取ガラスの破損を防止するためのガード部材を、上記回転部材と一体で回転するように設けるとよい。
【0012】
さらに、上記いずれかの両面読取装置を備えた画像形成装置を提供する。
【0013】
【発明の実施の形態】
以下、この発明の実施の形態を図面に基づいて説明する。
図1はこの発明の基礎となる両面読取装置の回転搬送路付近を示す概略構成図、図2は同じくその両面読取装置を備えた画像形成装置の一例を示す全体構成図、図3は図1の両面読取装置に設けられている読取センサを180度回転させた状態を示す概略図、図4は同じくその読取センサを回転させる読取センサ回転機構部を示す側面図である。
【0014】
図2に示す画像形成装置は、装置本体1の上部に設けた原稿トレイ2上から原稿Dを原稿搬送路3を通して両面読取装置10に搬送し、そこで原稿Dの同図で下側の第1面の画像を読取センサ11で読み取り、その読み取った画像データを後述する原稿画情報メモリ部63(図5)に保存する。
【0015】
そして、その原稿Dの後端が両面読取装置10の回転搬送路12を抜けると、その回転搬送路12を読取センサ11と共に180度回転させた後に、原稿Dを図2で右方に向けて逆方向に搬送し、今度は原稿Dの同図で上側の第2面の画像を、図2に示した位置から180度回転した位置にある読取センサ11で読み取り、その読み取った画像データを同様に原稿画情報メモリ部63に保存する。
その後、その原稿Dを直進させて原稿集積トレイ13に排出する。
そして、回転搬送路12を読取センサ11と共に再び180度回転させて、それらを図2に示した位置に戻して次の原稿Dの画像読取に備える。
【0016】
また、この画像形成装置は画像形成動作を開始させると、感光体ドラム5が図2で矢示A方向に回転し、帯電チヤージヤ4により感光体ドラム5の表面が一様に帯電される。また、レーザ光出射装置15からレーザ光が所定のタイミングで射出され、それが光学系16を介して感光体ドラム5の表面に当って、その表面が画像データに応じて露光され、そこに静電潜像が形成される。
その静電潜像は、現像器6によってトナーが付着されて顕像化される。
【0017】
また、装置本体1の下部に設けられている給紙部7から転写紙Pが給紙され、それがレジストローラ対8で一旦停止された後に、感光体ドラム5上の画像と一致する正確なタイミングで転写ローラ9のある転写位置に向けて搬送される。
そして、その転写紙Pに、感光体ドラム5上のトナー像が転写ローラ9により転写され、その転写紙Pは搬送ベルト17により定着装置22へ搬送され、そこでトナー像が定着される。
【0018】
ここで、両面画像形成モードが選択されているときには、その転写紙Pは両面装置25に搬送され、そこで表裏が反転された後に再び感光体ドラム5に搬送され、今度は裏面のまだ画像が形成されていない面に次の画像が形成され、その後その転写紙Pは直進されて排紙トレイ23へ排出される。
また、転写,分離が終了した感光体ドラム5の表面は、クリーニング装置24により残留トナーが除去され、次の画像形成に備える。
【0019】
次に、両面読取装置10について詳しく説明する。
両面読取装置10は、図1に示すように原稿搬送路3に、駆動源である後述する駆動モータ30(図4参照)により回転される回転部材である対をなす読取側板35,36(図4も参照)を設けると共に、その読取側板35,36に原稿搬送路3の一部を回転搬送路12として一体に設けている。
【0020】
そして、その読取側板35,36に、回転搬送路12を通過中の原稿の一方の面の画像を読み取り可能に読取センサ11を取り付け、原稿搬送路3の読取側板35,36に対して原稿搬送順方向上流側(図1で右方側)に、原稿搬送路3を搬送される原稿を検知する第1の原稿検知センサ41と対のローラからなる第1の搬送ローラ51を、また原稿搬送順方向下流側に原稿搬送路3を搬送される原稿を検知する第2の原稿検知センサ42と対のローラからなる第2の搬送ローラ52をそれぞれ設け、その第1の搬送ローラ51と第2の搬送ローラ52を、それぞれ後述するローラ駆動源である駆動モータ45(図5)により正逆両方向に回転可能に設けている。
【0021】
また、この両面読取装置10は、図1に矢印でそれぞれ示す正方向に回転させた第1の搬送ローラ51により、同図で左方に向かう原稿搬送順方向に搬送される原稿の第1面(図1で下側の面)の画像を読取センサ11により読み取らせ、その原稿が正方向に回転させた第2の搬送ローラ52により原稿搬送順方向に搬送されて後端側の端部Dbが回転搬送路12を抜けた後に前述した駆動源を駆動させて読取側板35,36を読取センサ11と共に180度回転させ、その後で第1の搬送ローラ51と第2の搬送ローラ52を共に逆方向(図1の矢印と反対方向)に回転させて原稿を逆方向に搬送させ、その原稿の第2面(図1で上側の面)の画像を読取センサ11により読み取らせる制御を行う中央処理装置(CPU)60(図5で後述する)を設けている。
【0022】
この両面読取装置10の回転搬送路12は、読取センサ11の読み取り側(図1で上側)を覆う読取ガラス28と、その読取ガラス28に対して原稿搬送順方向の上流側に近接させて設けた読取入口ガイド板18と、下流側に近接させて設けた読取出口ガイド板19と、その読取入口ガイド板18及び読取出口ガイド板19と読取ガラス28に共に所定の間隔を置いて対向配置された読取基準ガイド板14とにより構成されている。
【0023】
そして、その読取基準ガイド板14の原稿搬送方向の全長Lを読取入口ガイド板18の入り口から読取出口ガイド板19の出口迄の距離Lに略一致させ、読取側板35,36の回転中心Oを、読取基準ガイド板14の原稿搬送方向の中間位置としている。
【0024】
読取センサ11と読取基準ガイド板14は、図4に示すように左右の読取側板35,36に例えばネジ止めにより一体に固定されている。その読取側板35,36には軸33が固定されていて、その軸33の両端部33a,33bが、読取側板35と36のそれぞれ外側に所定量突出している。
【0025】
そして、その端部33aを、本体側板37により図示しない軸受を介して回転可能に支持すると共に、他方の端部33bを本体側板38により図示しない軸受を介して回転可能に支持している。
なお、左右の読取側板35,36は、それらの外面側に2本の軸をその回転中心を互いに一致させるようにしてそれぞれ固定し、その2本の軸を左右の本体側板37,38でそれぞれ回転可能に支持するようにしてもよい。
【0026】
軸33の一方の端部33bには、読取センサギヤ31を固定し、その読取センサギヤ31を本体側板38に本体部を固定している駆動モータ30の回転軸に固定しているモータギヤ32に噛み合わせている。
したがって、駆動モータ30を正回転させることにより、図1に示した位置にある読取センサ11を、同図で時計回り方向に180度回転させて、図3に示す位置に読取基準ガイド板14や読取入口ガイド板18及び読取出口ガイド板19と共に一体で回転させて停止させることができる。
【0027】
さらに、駆動モータ30を回転させて、その図3に示した位置にある読取センサ11を同図で時計回り方向に更に180度回転させて、図1に示した位置に読取基準ガイド板14や読取入口ガイド板18及び読取出口ガイド板19と共に戻すこともできる。
【0028】
この両面読取装置10は、図1に示した原稿搬送路3から原稿Dが矢示B方向に搬送されてくると、その原稿Dは駆動モータ45(図5)により駆動されて図1の矢示方向に正回転している第1の搬送ローラ51により入口前ガイド板43,44の間に向けて搬送される。
【0029】
そして、その原稿Dが入口前ガイド板43,44の間を搬送されると、その際に第1の原稿検知センサ41がその原稿Dの先端側の端部Daを検知する。すると、図1に示す位置にある読取センサ11が、読取基準ガイド板14と読取ガラス28との間に搬送された原稿Dの下面Ddの画像の読み取りを開始する。
その読取センサ11による画像の読み取りは、第1の原稿検知センサ41が原稿Dの後端側の端部Dbを検知すると、その所定時間後に終了する。
【0030】
その後、この両面読取装置10の下流側の搬送路に設けられている第2の原稿検知センサ42が原稿Dの後端側の端部Dbを検知すると、駆動モータ45(図5)の回転が停止されることにより第1の搬送ローラ51と第2の搬送ローラ52の回転が一旦停止される。
【0031】
そこで、駆動モータ30を回転させて、図1に示した位置にある読取センサ11を、読取基準ガイド板14や読取入口ガイド板18及び読取出口ガイド板19と一体で図3に示す位置まで180度回転させて、その位置に停止させる。
【0032】
その後、駆動モータ45を、今度は逆回転させることにより原稿Dを図3で右方に搬送する。そして、その原稿Dの先端側の端部Db(これまでの後端)を第2の原稿検知センサ42が検知すると、読取センサ11による原稿Dの上面Dcの画像の読み取りを開始する。
その原稿Dの後端側の端部Daを第2の原稿検知センサ42が検知すると、その所定時間後に読取センサ11による読み取りを終了する。
そして、その上面Dcの画像の読み取りが終了すると、再び駆動モータ30を回転させて読取センサ11等を図1に示した位置に戻す。
【0033】
このようにして、この両面読取装置10は、原稿Dの両面に形成されている画像をそれぞれ読み取るが、その際に原稿Dの下面Ddの画像は原稿の端部Da(原稿Dの順方向搬送時における原稿先端側)側から読み取る。これに対し、上面Dc側の画像は原稿の端部Db(原稿Dの順方向搬送時における原稿後端側)側から読み取る。
【0034】
なお、このように原稿Dの上面Dc側の画像を、その原稿Dの順方向搬送時における原稿後端側の端部Dbから読み取っても、その読み取った画像データをメモリ部に保存する際には、そのメモリ部の最下行から保存して順次上の行に保存していくので、上面側と下面側とで画像情報を上下逆に読み取った原稿のデータ配置を修正することができる。この点については、その詳しい説明を後述する。
【0035】
次に、図2に示した画像形成装置の制御系を図5を参照して説明する。
この画像形成装置の制御系は、中央処理装置(CPU)60が、データバス50を通して第1の原稿検知センサ41と、第2の原稿検知センサ42と、原稿画情報メモリ部63と、オペポート64と、ラインバッフア65と、読取センサ11と、駆動モータ30と、駆動モータ45と、モデム66と、ROM67と、頁カウンタ68とに接続されている。そして、モデム66は外部の通信回線に接続するためのネットワークコントロールユニット(NCU)69に接続されている。
【0036】
そして、この実施の形態では、原稿画情報メモリ部63が、読取センサ11が読み取った画像データを記憶する記憶手段として機能する。
また、中央処理装置(CPU)60が、原稿画情報メモリ部63に原稿の第1面(図3の下面Dd)の画像を読み取った画像データは開始行から記憶させ、第2面(図3の上面Dc)の画像を読み取った画像データは最終行から記憶させる手段として機能する。
【0037】
図6は原稿の下面側の画像を読み込んだ時のデータ処理を説明するための概念図、図7は原稿の上面側の画像を読み込んだ時のデータ処理を説明するための概念図である。
この両面読取装置10は、図1に示した原稿Dの下面Dd側の画像を読み取るときには、前述したように原稿Dの端部Da(原稿Dの順方向搬送時における原稿先端側)から読み取り、それを図6に示すように原稿画情報メモリ部63の最上行から順次下の行に保存(蓄積)していく。
そして、その保存した画像データを送信したり、記録側に渡すときには、その原稿画情報メモリ部63に保存した最上行を1ライン目とし、以降2行目以下を2ライン目以降として、順に出力していく。
【0038】
また、原稿Dの上面Dc側の画像を読み取るときには、前述したように原稿Dの端部Db(原稿Dの順方向搬送時における原稿後端側)から読み取り、それを図7に示すように原稿画情報メモリ部63の最下行から順次上の行に保存(蓄積)していく。
【0039】
そして、その保存した画像データを送信したり、記録側に渡すときには、その原稿画情報メモリ部63に保存した最上行を1ライン目とし、以降2行目以下を2ライン目以降として、順に出力していく。
このように、原稿Dの上面Dc側の画像を読み取ったときには、画像情報(画像データ)を上下逆に配置して修正するので、原稿画情報メモリ部63に保存した読取データを送信したり、記録側に渡すときには、保存した画像データを最上行を1ライン目とし、以降2行目以下を2ライン目以降として、共に出力順を揃えることができる。
【0040】
図8は回転搬送路を読取ガラスとそれと全長を略一致させた読取基準ガイド板とで構成するようにしたこの発明による両面読取装置の実施形態を示す図1と同様な概略構成図、図9は同じくその両面読取装置に設けられている読取センサを180度回転させた状態を示す概略図であり、図1と対応する部分には同一の符号を付してある。
【0041】
この実施の形態による両面読取装置は、回転部材である読取側板35,36に設ける回転搬送路12′を、読取センサ11の読み取り側を覆う読取ガラス28′と、その読取ガラス28′に対して所定の間隔を置いて対向配置された読取基準ガイド板14とにより構成し、読取ガラス28′の原稿搬送方向の全長Lを読取基準ガイド板14の原稿搬送方向の全長Lに略一致させ、読取側板35,36の回転中心Oを、読取基準ガイド板14の原稿搬送方向の中間位置にしている。
【0042】
そして、回転中心Oから読取センサ11を覆っているセンサケース21の最も離れた位置までの回転半径rと、回転中心Oから読取基準ガイド板14の端部迄の回転半径rとが略一致するようにし、さらに読取ガラス28′の全長を略回転半径r×2にすることにより、極力小さい回転半径r(r≒r≒r)とすることで、両面読取装置の回転搬送路12′を含む回転部の大きさを、できるだけ小さくしている。
【0043】
また、この実施の形態による両面読取装置では、読取センサ11のセンサケース21の横幅に対して読取ガラス28′の全長Lが大きいため、メンテナンス時等に読取ガラス28′に触れてそれを破損させてしまう恐れがある。
そこで、図10に示すように、例えばセンサケース21の側面に、読取ガラス28′の原稿に対向する面と反対の面28a側にその読取ガラス28′の破損を防止するためのリブ状のガード部材54,55を取り付けることにより、そのガード部材54,55を読取側板35,36(図8)と一体で回転するように設けるとよい。
【0044】
なお、この両面読取装置も図1乃至図7で説明した両面読取装置と同様に、駆動モータ(図4の駆動モータ30を参照)により、図9に示すように回転搬送路12′が読取センサ11や読取ガラス28′及び読取基準ガイド板14等と共に180度回転する点は同様である。
【0045】
【発明の効果】
以上説明したように、この発明によれば、次に記載する効果を奏する。
請求項1の両面読取装置及び請求項3の画像形成装置によれば、回転部材に原稿搬送路の一部を構成する回転搬送路と読取センサを設け、その読取センサが回転部材と共に180度回転するようにしたので、原稿を表裏反転させたりせずに、1つの読取センサで原稿の表裏両面の画像を読み取ることができる。それにより、装置全体を小型にすることができると共に低コストにすることができる。
【0047】
また、回転搬送路を読取ガラスとその読取ガラスに対して所定の間隔を置いて対向配置された読取基準ガイド板とで構成し、その読取ガラスの原稿搬送方向の全長を読取基準ガイド板の原稿搬送方向の全長に略一致させ、回転部材の回転中心を読取基準ガイド板の原稿搬送方向の中間位置としたので、回転搬送路の回転軌跡を最小にして装置全体を小型にすることができ、さらに回転搬送路は読取ガラスと読取基準ガイド板とだけで構成されていて、その途中にはガイド板を繋いで構成する場合のような段差部がないので、回転搬送路内での搬送ジャムを防止できるため高い信頼性が得られる。
【0049】
請求項2の両面読取装置によれば、読取ガラスの原稿搬送方向の全長を読取基準ガイド板の原稿搬送方向の全長に略一致させるように長くしても、その読取ガラスはガード部材によってガードされるので、メンテナンス等の際に読取ガラスを破損させてしまうのを防止することができる。
【図面の簡単な説明】
【図1】 この発明の基礎となる両面読取装置の回転搬送路付近を示す概略構成図である。
【図2】同じくその両面読取装置を備えた画像形成装置の一例を示す全体構成図である。
【図3】図1の両面読取装置に設けられている読取センサを180度回転させた状態を示す概略図である。
【図4】同じくその読取センサを回転させる読取センサ回転機構部を示す側面図である。
【図5】図2の画像形成装置の制御系を説明するためのブロック図である。
【図6】原稿の下面側の画像を読み込んだ時のデータ処理を説明するための概念図である。
【図7】原稿の上面側の画像を読み込んだ時のデータ処理を説明するための概念図である。
【図8】 回転搬送路を読取ガラスとそれと全長を略一致させた読取基準ガイド板とで構成するようにしたこの発明による両面読取装置の実施形態を示す図1と同様な概略構成図である。
【図9】同じくその両面読取装置に設けられている読取センサを180度回転させた状態を示す概略図である。
【図10】読取センサのセンサケースに読取ガラスの破損を防止するためのリブ状のガード部材を取り付けた例を示す概略図である。
【符号の説明】
3:原稿搬送路 10:両面読取装置
11:読取センサ
12,12′:回転搬送路 14:読取基準ガイド板
18:読取入口ガイド板 19:読取出口ガイド板
28,28′:読取ガラス
30:駆動モータ(駆動源)
35,36:読取側板(回転部材)
51:第1の搬送ローラ 52:第2の搬送ローラ
60:中央処理装置
63:原稿画情報メモリ部
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a double-sided reading device and a double-sided reading device in which images of a first surface and a second surface of a document conveyed on the document conveyance path are read by a reading sensor provided on a document conveyance path for conveying the document. The present invention relates to an image forming apparatus including
[0002]
[Prior art]
As a conventional double-sided reading device that can read images on both sides of a document, for example, there is one described in JP-A-10-207979.
In this double-sided reading device, a form set in a paper feeding unit is transported to a reading unit by a supply unit, and an image on the first surface of the form is optically scanned and read by the reading unit, and the image data is digitized to form an image. Store in buffer.
[0003]
The form whose surface image is scanned is transported to the first reversing unit, and then to the second reversing unit through the flipping unit, and again to the reading unit with the front and back reversed. Be transported. Then, the back side image is optically scanned by the reading unit, and the read image data is digitized and stored in the image buffer.
In addition, the double-sided reading device includes a surface engineering unit that reads the white surface reference along the original conveyance path and a back surface engineering unit that reads the white surface reference as described in, for example, JP-A-11-127350. Some are arranged.
[0004]
[Problems to be solved by the invention]
However, in the case of the former double-sided reading device, the front and back surfaces are reversed by conveying the form after reading the image on the surface from the first reversing unit to the second reversing unit through the flipping unit, and thereafter In this configuration, the back side image is read (scanned), and therefore a first inversion unit, a flip unit, and a second inversion unit for inverting the form to the back side are necessary. However, there is a problem in that the cost increases due to the complicated conveyance path and conveyance drive system.
[0005]
In addition, there is also a problem that the entire apparatus is increased in size due to the conveyance path for reversing the form to the back side.
Further, such a configuration in which the front / back reversing conveyance path is provided requires a time for a document such as a document to pass through the conveyance path, and thus takes a long processing time.
[0006]
Further, in the case of the latter double-sided reading apparatus, since the engineering units for reading are provided on both the upper side and the lower side with respect to the document conveyance path, the cost is twice as high as that in the case of one optical system. In addition, there is a problem that the size of the apparatus is increased as much as the space for housing the optical system is required twice.
In addition, since the image reading process on both sides of the document is processed at substantially the same timing, the processing speed of the electric and software is increased, which increases the cost accordingly.
[0007]
The present invention has been made in view of the above-described problems, and does not provide a reversing path for reversing a document, and reads images on both sides of a two-sided document having images on both sides with only one reading sensor. The purpose is to be small and low cost.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a double-sided image in which images on a first surface and a second surface of a document conveyed on the document conveyance path are read by a reading sensor provided on the document conveyance path for conveying the document. In the reading device,
A rotating member that is rotated by a drive source is provided in the document conveying path, and a part of the document conveying path is integrally provided as a rotating conveying path on the rotating member, and the document that is passing through the rotating conveying path on the rotating member. The reading sensor is attached so as to be able to read an image on one side of the document, and a first conveying roller is disposed upstream of the rotating member of the document conveying path in the document conveying forward direction, and a second conveying roller is disposed downstream in the document conveying forward direction. The first and second transport rollers are provided so as to be rotatable in both forward and reverse directions by a roller drive source.
[0009]
In addition, the image on the first surface of the document conveyed in the document conveyance forward direction by the first conveyance roller rotated in the forward direction is read by the reading sensor, and the document is rotated in the positive direction. The conveying roller is conveyed in the document conveying forward direction, the trailing end passes through the rotating conveying path, the driving source is driven, the rotating member is rotated 180 degrees together with the reading sensor, and then the first conveying is performed. Means are provided for rotating the roller and the second conveying roller in the opposite directions to convey the document in the opposite direction and for reading the image on the second surface of the document by the reading sensor.
[0011]
Further , the rotary conveyance path provided in the rotating member is constituted by a reading glass that covers the reading side of the reading sensor, and a reading reference guide plate that is disposed to face the reading glass at a predetermined interval, and The entire length of the reading glass in the document conveyance direction is made substantially coincident with the total length of the reading reference guide plate in the document conveyance direction, and the rotation center of the rotating member is set at an intermediate position of the reading reference guide plate in the document conveyance direction.
In that case, a guard member for preventing the reading glass from being damaged may be provided on the rotating member on the surface opposite to the surface of the reading glass facing the document so as to rotate integrally with the rotating member .
[0012]
Furthermore, to provide an image forming apparatus having any one of the above-described double-sided reading device.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram showing the vicinity of a rotary conveyance path of a double-sided reading device as a basis of the present invention, FIG. 2 is an overall configuration diagram showing an example of an image forming apparatus similarly provided with the double-sided reading device, and FIG. FIG. 4 is a side view showing a reading sensor rotating mechanism that rotates the reading sensor. FIG.
[0014]
The image forming apparatus shown in FIG. 2 conveys a document D from a document tray 2 provided on the upper part of the apparatus main body 1 through a document conveyance path 3 to a double-sided reading device 10. The image of the surface is read by the reading sensor 11, and the read image data is stored in a document image information memory unit 63 (FIG. 5) described later.
[0015]
When the trailing edge of the document D passes through the rotary conveyance path 12 of the double-sided reading device 10, the rotary conveyance path 12 is rotated 180 degrees together with the reading sensor 11, and then the document D is directed rightward in FIG. The image is conveyed in the opposite direction, and this time, the image on the second upper surface of the document D is read by the reading sensor 11 at a position rotated 180 degrees from the position shown in FIG. 2, and the read image data is the same. Is stored in the original image information memory unit 63.
Thereafter, the document D is moved straight and discharged to the document stacking tray 13.
Then, the rotary conveyance path 12 is rotated again 180 degrees together with the reading sensor 11 and returned to the position shown in FIG. 2 to prepare for the next image reading of the document D.
[0016]
When the image forming apparatus starts an image forming operation, the photosensitive drum 5 rotates in the direction indicated by the arrow A in FIG. 2, and the surface of the photosensitive drum 5 is uniformly charged by the charging charger 4. Further, laser light is emitted from the laser light emitting device 15 at a predetermined timing, and it strikes the surface of the photosensitive drum 5 through the optical system 16, and the surface is exposed according to the image data, and is statically there. An electrostatic latent image is formed.
The electrostatic latent image is visualized by the toner attached by the developing device 6.
[0017]
In addition, the transfer paper P is fed from the paper feed unit 7 provided at the lower part of the apparatus main body 1, and after it is temporarily stopped by the pair of registration rollers 8, the transfer paper P accurately matches the image on the photosensitive drum 5. It is conveyed toward the transfer position where the transfer roller 9 is located at the timing.
Then, the toner image on the photosensitive drum 5 is transferred onto the transfer paper P by the transfer roller 9, and the transfer paper P is conveyed to the fixing device 22 by the conveyance belt 17, where the toner image is fixed.
[0018]
Here, when the double-sided image forming mode is selected, the transfer paper P is transported to the double-sided device 25, where the front and back sides are reversed and then transported to the photosensitive drum 5 again. The next image is formed on the unfinished surface, and then the transfer paper P is straightened and discharged to the paper discharge tray 23.
Further, the toner remaining on the surface of the photosensitive drum 5 after the transfer and separation is removed by the cleaning device 24 to prepare for the next image formation.
[0019]
Next, the double-sided reading device 10 will be described in detail.
As shown in FIG. 1, the double-sided reading device 10 has a pair of reading side plates 35 and 36 (see FIG. 4) that are rotating members rotated by a driving motor 30 (see FIG. 4), which will be described later. 4 is also provided, and a part of the document conveyance path 3 is integrally provided as a rotation conveyance path 12 on the reading side plates 35 and 36.
[0020]
A reading sensor 11 is attached to the reading side plates 35 and 36 so as to be able to read an image of one side of the document passing through the rotary conveyance path 12, and the document conveyance is performed with respect to the reading side plates 35 and 36 of the document conveyance path 3. On the upstream side in the forward direction (on the right side in FIG. 1), a first conveyance roller 51 including a pair of rollers and a first document detection sensor 41 that detects a document conveyed on the document conveyance path 3 is also conveyed. A second document detection sensor 42 for detecting a document conveyed on the document conveyance path 3 on the downstream side in the forward direction and a second conveyance roller 52 including a pair of rollers are provided, respectively, and the first conveyance roller 51 and the second conveyance roller 51 are provided. The transport rollers 52 are provided so as to be rotatable in both forward and reverse directions by a drive motor 45 (FIG. 5) which is a roller drive source described later.
[0021]
Further, the double-sided reading device 10 has a first surface of a document that is transported in the forward document transport direction toward the left in FIG. 1 by a first transport roller 51 that is rotated in the forward direction indicated by an arrow in FIG. An image on the lower surface (in FIG. 1) is read by the reading sensor 11, and the document is conveyed in the document conveyance forward direction by the second conveyance roller 52 rotated in the forward direction, and the end Db on the rear end side. After passing through the rotary conveyance path 12, the drive source described above is driven to rotate the reading side plates 35 and 36 together with the reading sensor 11 by 180 degrees, and then the first conveyance roller 51 and the second conveyance roller 52 are reversed. Central processing for performing control to rotate the image in the direction (opposite to the arrow in FIG. 1) to convey the document in the opposite direction and to read the image on the second surface (upper surface in FIG. 1) of the document by the reading sensor 11. Device (CPU) 60 (described later in FIG. 5) That) a is provided.
[0022]
The rotary conveyance path 12 of the double-sided reading device 10 is provided close to the reading glass 28 covering the reading side (upper side in FIG. 1) of the reading sensor 11 and the upstream side in the document conveyance forward direction with respect to the reading glass 28. The reading inlet guide plate 18, the reading outlet guide plate 19 provided close to the downstream side, and the reading inlet guide plate 18, the reading outlet guide plate 19, and the reading glass 28 are both opposed to each other at a predetermined interval. And a reading reference guide plate 14.
[0023]
Then, substantially matched to the distance L 2 until the exit of the outlet guide plate 19 read from the entrance of the inlet guide plate 18 reading the overall length L 1 of the document conveying direction of the reading reference guide plate 14, the rotation center of the reading side plates 35 and 36 O is the intermediate position of the reading reference guide plate 14 in the document conveyance direction.
[0024]
As shown in FIG. 4, the reading sensor 11 and the reading reference guide plate 14 are integrally fixed to the left and right reading side plates 35 and 36 by, for example, screwing. A shaft 33 is fixed to the reading side plates 35 and 36, and both end portions 33 a and 33 b of the shaft 33 protrude from the reading side plates 35 and 36 by a predetermined amount.
[0025]
The end portion 33a is rotatably supported by a main body side plate 37 via a bearing (not shown), and the other end portion 33b is rotatably supported by a main body side plate 38 via a bearing (not shown).
The left and right reading side plates 35 and 36 are fixed to the outer surfaces of the two shafts so that the rotation centers thereof coincide with each other, and the two shafts are fixed by the left and right main body side plates 37 and 38, respectively. You may make it support so that rotation is possible.
[0026]
A reading sensor gear 31 is fixed to one end 33 b of the shaft 33, and the reading sensor gear 31 is meshed with a motor gear 32 fixed to the rotating shaft of the drive motor 30 that fixes the main body to the main body side plate 38. ing.
Therefore, by rotating the drive motor 30 forward, the reading sensor 11 at the position shown in FIG. 1 is rotated 180 degrees clockwise in FIG. It can be rotated together with the reading inlet guide plate 18 and the reading outlet guide plate 19 and stopped.
[0027]
Further, the drive motor 30 is rotated, and the reading sensor 11 at the position shown in FIG. 3 is further rotated 180 degrees in the clockwise direction in FIG. It can be returned together with the reading inlet guide plate 18 and the reading outlet guide plate 19.
[0028]
When the original D is conveyed in the direction indicated by the arrow B from the original conveying path 3 shown in FIG. 1, the double-sided reading device 10 is driven by a drive motor 45 (FIG. 5) and is driven by the arrow shown in FIG. It is conveyed toward the front entrance guide plates 43 and 44 by the first conveyance roller 51 that is rotating forward in the indicated direction.
[0029]
When the document D is conveyed between the front entrance guide plates 43 and 44, the first document detection sensor 41 detects the end portion Da on the leading end side of the document D at that time. Then, the reading sensor 11 at the position shown in FIG. 1 starts reading the image on the lower surface Dd of the document D conveyed between the reading reference guide plate 14 and the reading glass 28.
The reading of the image by the reading sensor 11 ends after a predetermined time when the first document detection sensor 41 detects the end Db on the rear end side of the document D.
[0030]
Thereafter, when the second document detection sensor 42 provided in the conveyance path on the downstream side of the double-sided reading device 10 detects the end Db on the rear end side of the document D, the drive motor 45 (FIG. 5) rotates. By stopping, the rotation of the first transport roller 51 and the second transport roller 52 is temporarily stopped.
[0031]
Therefore, by rotating the drive motor 30, the reading sensor 11 at the position shown in FIG. 1 is integrated with the reading reference guide plate 14, the reading inlet guide plate 18 and the reading outlet guide plate 19 to the position shown in FIG. Rotate it to stop at that position.
[0032]
Thereafter, the document motor D is conveyed rightward in FIG. When the second document detection sensor 42 detects the leading end Db (the rear end so far) of the document D, the reading sensor 11 starts reading the image on the upper surface Dc of the document D.
When the second document detection sensor 42 detects the end portion Da on the rear end side of the document D, reading by the reading sensor 11 is finished after a predetermined time.
When the reading of the image on the upper surface Dc is completed, the drive motor 30 is rotated again to return the reading sensor 11 and the like to the position shown in FIG.
[0033]
In this way, the double-sided reading device 10 reads images formed on both sides of the document D, and the image on the lower surface Dd of the document D is transferred at the end portion Da of the document (forward conveyance of the document D). Scan from the document's leading edge side. On the other hand, the image on the upper surface Dc side is read from the end portion Db of the original (the rear end side of the original when the original D is conveyed in the forward direction).
[0034]
Even when the image on the upper surface Dc side of the original D is read from the end Db on the rear end side of the original D when the original D is transported in the forward direction, the read image data is stored in the memory unit. Since the image data is stored from the bottom row of the memory unit and is sequentially stored in the upper row, the data arrangement of the document obtained by reading the image information upside down on the upper surface side and the lower surface side can be corrected. This point will be described in detail later.
[0035]
Next, the control system of the image forming apparatus shown in FIG. 2 will be described with reference to FIG.
In the control system of this image forming apparatus, a central processing unit (CPU) 60 includes a first document detection sensor 41, a second document detection sensor 42, a document image information memory unit 63, and an operation port 64 through a data bus 50. Are connected to the line buffer 65, the reading sensor 11, the drive motor 30, the drive motor 45, the modem 66, the ROM 67, and the page counter 68. The modem 66 is connected to a network control unit (NCU) 69 for connecting to an external communication line.
[0036]
In this embodiment, the document image information memory unit 63 functions as a storage unit that stores image data read by the reading sensor 11.
The central processing unit (CPU) 60 stores the image data obtained by reading the image of the first surface (the lower surface Dd in FIG. 3) of the document in the document image information memory unit 63 from the start line, and the second surface (FIG. 3). The image data obtained by reading the image of the upper surface Dc) functions as means for storing from the last line.
[0037]
FIG. 6 is a conceptual diagram for explaining data processing when an image on the lower surface side of a document is read, and FIG. 7 is a conceptual diagram for explaining data processing when an image on the upper surface side of the document is read.
When reading the image on the lower surface Dd side of the original D shown in FIG. 1, the double-sided reading device 10 reads from the end portion Da of the original D (the front end of the original when the original D is conveyed in the forward direction) as described above. As shown in FIG. 6, it is stored (accumulated) sequentially from the top row of the document image information memory section 63 to the lower row.
Then, when the stored image data is transmitted or passed to the recording side, the top line stored in the document image information memory unit 63 is set as the first line, and the second and subsequent lines are output as the second line and thereafter in order. I will do it.
[0038]
Further, when reading the image on the upper surface Dc side of the original D, as described above, it is read from the end Db of the original D (the rear end side of the original when the original D is conveyed in the forward direction), and this is shown in FIG. The image information memory unit 63 stores (accumulates) sequentially from the bottom row to the top row.
[0039]
Then, when the stored image data is transmitted or passed to the recording side, the top line stored in the document image information memory unit 63 is set as the first line, and the second and subsequent lines are output as the second line and thereafter in order. I will do it.
As described above, when the image on the upper surface Dc side of the document D is read, the image information (image data) is arranged upside down and corrected, so that the read data stored in the document image information memory unit 63 is transmitted, When the image data is transferred to the recording side, the output order of the stored image data can be aligned with the first line as the first line and the second and subsequent lines as the second and subsequent lines.
[0040]
FIG. 8 is a schematic structural view similar to FIG. 1 showing an embodiment of a double-sided reading device according to the present invention , in which the rotary conveyance path is constituted by a reading glass and a reading reference guide plate substantially matching the entire length thereof. FIG. 2 is a schematic view showing a state in which a reading sensor provided in the double-sided reading apparatus is rotated 180 degrees, and the same reference numerals are given to portions corresponding to FIG.
[0041]
In the double-sided reading device according to this embodiment, the rotary conveyance path 12 ′ provided on the reading side plates 35, 36 that are rotating members is arranged with respect to the reading glass 28 ′ covering the reading side of the reading sensor 11 and the reading glass 28 ′. at a predetermined distance constituted by the reference guide plate 14 reading arranged opposite, to substantially match the total length L 3 of the original conveying direction of the reading glass 28 'to read the reference guide plate 14 document conveying direction of the overall length L 1 of The rotation center O of the reading side plates 35 and 36 is set to an intermediate position of the reading reference guide plate 14 in the document conveying direction.
[0042]
The rotation radius r 1 from the rotation center O to the farthest position of the sensor case 21 covering the reading sensor 11 and the rotation radius r 2 from the rotation center O to the end of the reading reference guide plate 14 are approximately. Further, by making the entire length of the reading glass 28 ′ substantially the rotation radius r 1 × 2 so as to make the rotation radius r as small as possible (r≈r 1 ≈r 2 ), the double-sided reading device is rotated and conveyed. The size of the rotating part including the path 12 'is made as small as possible.
[0043]
Also, double-sided reading apparatus according to this embodiment, 'since the total length L 3 of the large glass 28 reading the time of maintenance and the like' reading glass 28 reading the lateral width of the sensor case 21 of the sensor 11 damage it touches the There is a risk of letting you.
Therefore, as shown in FIG. 10, for example, a rib-shaped guard is provided on the side surface of the sensor case 21 to prevent the reading glass 28 'from being damaged on the side of the reading glass 28' opposite to the surface facing the document. By attaching the members 54 and 55, the guard members 54 and 55 may be provided so as to rotate integrally with the reading side plates 35 and 36 (FIG. 8).
[0044]
Note that this double-sided reading device is also driven by a driving motor (see the driving motor 30 in FIG. 4) so that the rotary conveyance path 12 'is read by a reading sensor as shown in FIG. 11 and the reading glass 28 ', the reading reference guide plate 14 and the like are rotated by 180 degrees.
[0045]
【The invention's effect】
As described above, according to the present invention, the following effects can be obtained.
According to the double-sided reading device of claim 1 and the image forming apparatus of claim 3 , the rotating member is provided with a rotating conveyance path and a reading sensor that constitute a part of the document conveying path, and the reading sensor rotates 180 degrees together with the rotating member. As a result, it is possible to read the images on both sides of the document with one reading sensor without inverting the document. Thereby, the entire apparatus can be reduced in size and cost can be reduced.
[0047]
Further, the rotation conveyance path is constituted by a reading glass and a reading reference guide plate arranged to face the reading glass at a predetermined interval, and the entire length of the reading glass in the document conveying direction is set as a document on the reading reference guide plate. Since the rotation center of the rotation member is set to the intermediate position in the document conveyance direction of the reading reference guide plate, the entire apparatus can be miniaturized by minimizing the rotation trajectory of the rotation conveyance path. Furthermore, the rotation conveyance path is composed only of the reading glass and the reading reference guide plate, and there is no step portion as in the case where the guide plate is connected in the middle of the rotation conveyance path. Therefore, high reliability can be obtained.
[0049]
According to the double-sided reading device of the second aspect , even if the entire length of the reading glass in the document conveying direction is made long so as to substantially match the total length of the reading reference guide plate in the document conveying direction, the reading glass is guarded by the guard member. Therefore, it is possible to prevent the reading glass from being damaged during maintenance or the like.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing the vicinity of a rotary conveyance path of a double-sided reading device as a basis of the present invention.
FIG. 2 is an overall configuration diagram illustrating an example of an image forming apparatus that similarly includes the double-sided reading device.
3 is a schematic view showing a state in which a reading sensor provided in the double-sided reading device of FIG. 1 is rotated 180 degrees. FIG.
FIG. 4 is a side view showing a reading sensor rotation mechanism that similarly rotates the reading sensor.
5 is a block diagram for explaining a control system of the image forming apparatus in FIG. 2; FIG.
FIG. 6 is a conceptual diagram for explaining data processing when an image on the lower surface side of a document is read.
FIG. 7 is a conceptual diagram for explaining data processing when an image on the upper surface side of an original is read.
FIG. 8 is a schematic configuration diagram similar to FIG. 1 showing an embodiment of a double-sided reading device according to the present invention in which a rotary conveyance path is configured by a reading glass and a reading reference guide plate whose length substantially coincides with the reading glass. .
FIG. 9 is a schematic view showing a state where a reading sensor provided in the double-sided reading apparatus is rotated 180 degrees.
FIG. 10 is a schematic view showing an example in which a rib-shaped guard member for preventing breakage of the reading glass is attached to the sensor case of the reading sensor.
[Explanation of symbols]
3: Document transport path 10: Double-sided reading device 11: Reading sensor 12, 12 ': Rotation transport path 14: Reading reference guide plate 18: Reading inlet guide plate 19: Reading outlet guide plates 28, 28': Reading glass 30: Drive Motor (drive source)
35, 36: Reading side plate (rotating member)
51: First transport roller 52: Second transport roller 60: Central processing unit 63: Document image information memory unit

Claims (3)

原稿を搬送する原稿搬送路に設けた読取センサにより、その原稿搬送路を搬送される原稿の第1面と第2面の画像を読み取るようにした両面読取装置において、
前記原稿搬送路に駆動源により回転される回転部材を設けると共に、該回転部材に前記原稿搬送路の一部を回転搬送路として一体に設け、前記回転部材に前記回転搬送路を通過中の原稿の一方の面の画像を読み取り可能に前記読取センサを取り付け、前記原稿搬送路の前記回転部材に対して原稿搬送順方向上流側に第1の搬送ローラを、原稿搬送順方向下流側に第2の搬送ローラをそれぞれ設けると共に、前記第1の搬送ローラと第2の搬送ローラをそれぞれローラ駆動源により正逆両方向に回転可能に設け、
正方向に回転させた前記第1の搬送ローラにより原稿搬送順方向に搬送される原稿の第1面の画像を前記読取センサにより読み取らせ、その原稿が正方向に回転させた前記第2の搬送ローラにより原稿搬送順方向に搬送されて後端が前記回転搬送路を抜けた後に前記駆動源を駆動させて前記回転部材を前記読取センサと共に180度回転させ、その後で前記第1の搬送ローラと第2の搬送ローラを共に逆方向に回転させて原稿を逆方向に搬送させ、その原稿の第2面の画像を前記読取センサにより読み取らせる手段を設け、前記回転部材に設ける回転搬送路を、前記読取センサの読み取り側を覆う読取ガラスと、その読取ガラスに対して所定の間隔を置いて対向配置された読取基準ガイド板とにより構成し、前記読取ガラスの原稿搬送方向の全長を前記読取基準ガイド板の原稿搬送方向の全長に略一致させ、前記回転部材の回転中心を前記読取基準ガイド板の原稿搬送方向の中間位置としたことを特徴とする両面読取装置。
In a double-sided reading device configured to read images of a first surface and a second surface of a document conveyed on the document conveyance path by a reading sensor provided on the document conveyance path for conveying the document,
A rotating member that is rotated by a driving source is provided in the document conveying path, and a part of the document conveying path is integrally provided as a rotating conveying path on the rotating member, and the document that is passing through the rotating conveying path on the rotating member. The reading sensor is attached so as to be able to read an image on one side of the document, and a first conveying roller is disposed upstream of the rotating member of the document conveying path in the document conveying forward direction, and a second conveying roller is disposed downstream in the document conveying forward direction. Each of the transport rollers, and the first transport roller and the second transport roller can be rotated in both forward and reverse directions by a roller drive source,
The first conveyance roller rotated in the forward direction reads the image of the first surface of the document conveyed in the document conveyance forward direction by the reading sensor, and the second conveyance in which the document is rotated in the forward direction. After the roller is conveyed in the document conveyance forward direction and the trailing end passes through the rotation conveyance path, the drive source is driven to rotate the rotating member together with the reading sensor by 180 degrees, and then the first conveyance roller and A rotation conveying path provided in the rotating member is provided , the second conveying roller is rotated in the opposite direction to convey the document in the opposite direction, and a means for reading the image on the second surface of the document by the reading sensor is provided . A reading glass that covers the reading side of the reading sensor, and a reading reference guide plate that is arranged to face the reading glass at a predetermined interval, and that is arranged in the document conveyance direction of the reading glass. Length substantially matched to the entire length of the document conveying direction of the reading reference guide plate, double-sided reading device, characterized in that the center of rotation of the rotary member to an intermediate position of the document conveying direction of the reading reference guide plate.
請求項1記載の両面読取装置において、前記読取ガラスの原稿に対向する面と反対の面側に該読取ガラスの破損を防止するためのガード部材を、前記回転部材と一体で回転するように設けたことを特徴とする両面読取装置。 2. The double-sided reading device according to claim 1 , wherein a guard member for preventing breakage of the reading glass is provided on the surface of the reading glass opposite to the surface facing the original so as to rotate integrally with the rotating member. A double-sided reader characterized by the above. 請求項1又は2記載の両面読取装置を備えた画像形成装置。An image forming apparatus having a duplex scanning apparatus according to claim 1 or 2, wherein.
JP2000235367A 2000-08-03 2000-08-03 Double-sided reading apparatus and image forming apparatus having the same Expired - Fee Related JP3816318B2 (en)

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US6942213B2 (en) * 2002-04-10 2005-09-13 Seiko Epson Corporation Duplex scanning device
US7198419B2 (en) 2003-10-08 2007-04-03 Samsung Electronics Co., Ltd. Apparatus and method of performing double-sided printing
KR100608003B1 (en) * 2003-10-08 2006-08-02 삼성전자주식회사 Image forming apparatus capable of duplex printing and method thereof
KR100788657B1 (en) 2004-06-22 2007-12-26 삼성전자주식회사 Image forming apparatus capable of duplex printing and method thereof
KR100619051B1 (en) * 2004-10-09 2006-08-31 삼성전자주식회사 Thermal image forming apparatus
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KR20060110487A (en) * 2005-04-20 2006-10-25 삼성전자주식회사 Thermal printer using thermal printing head
JP5758674B2 (en) * 2011-03-31 2015-08-05 キヤノン電子株式会社 Image reading apparatus, control method thereof, and program

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