JP3553313B2 - Paper feed mechanism of automatic document feeder - Google Patents

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JP3553313B2
JP3553313B2 JP08806197A JP8806197A JP3553313B2 JP 3553313 B2 JP3553313 B2 JP 3553313B2 JP 08806197 A JP08806197 A JP 08806197A JP 8806197 A JP8806197 A JP 8806197A JP 3553313 B2 JP3553313 B2 JP 3553313B2
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bearing member
drive shaft
opening
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paper feed
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JPH10279097A (en
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秀樹 飛永
博司 深野
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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】
本発明は、複写機、ファクシミリ装置、プリンター装置、スキャナー装置等の画像処理装置に具備される自動原稿搬送装置の給紙機構に関し、詳しくは、駆動軸を自動原稿搬送装置の本体に対して軸方向にスライドさせることにより、該本体に脱着可能な自動原稿搬送装置の給紙機構に関する。
【0002】
【従来の技術】
近時、複写機、ファクシミリ装置、プリンター装置、スキャナー装置等の画像処理装置にあっては、高速化、多機能化するとともに、より一層の省スペース化が要求されており、それに従ってこの画像処理装置に具備される自動原稿搬送装置(以下、単にADFという)の省スペース化もより一層要求されるようになっている。
【0003】
このような要求を満足するために、ADFにあっては、原稿載置台上に載置された複数の原稿からなる原稿束を分離した後、反転経路を介して露光位置に搬送するターン給紙を行なう構造を採用しており、このようにすることで、幅方向長さを短くしている。
ところで、このようなターン給紙にあっては、原稿面を上向きにして原稿載置台上に原稿を載置することから、この原稿を給紙する給紙手段として、呼出しローラや給紙ベルトを原稿の搬送路に対して上方に設けるようになっており、呼出しローラで原稿束を呼出した後、給紙方向に周回移動する給紙ベルトおよび搬送路に対して下方に設けられこの給紙ベルトに摺接して分離方向に回転する分離コロによって原稿を分離するようになっている。
【0004】
そして、この給紙ベルトは、定期的に交換する必要があるため、メンテナンスを効率良く行なうことができるようにADF本体に対して簡易に脱着できる構成となっており、給紙機構として例えば、図8に示す構成を採用している。
図8において、51は給紙機構であり、この給紙機構51は一端部でADFの本体58側に設けられた駆動機構59の係合穴59aに係合される駆動軸52を有し、この駆動軸52の一端部に設けられたピン52aを係合穴59aに係合して本体58に取付けることにより、駆動機構59から駆動軸52に駆動力が伝達されるようになっている。
【0005】
この駆動軸52の略中央部には給紙ベルト保持ブラケット53が装着されており、このブラケット53内には給紙ベルト54および呼出しローラ55が収納され、給紙ベルト54は駆動軸52に一体的に取付けられた駆動ローラと給紙ベルト54の周回移動に連れ回りする従動ローラに橋架されているとともに、呼出しローラ55はタイミングベルトを介して駆動ローラに連結されている。
【0006】
また、駆動軸52の他端部には軸受56が駆動軸52に移動自在に設けられており、この軸受56は図9に示すように本体58に形成された開口部58aに挿入されるようになっている。
この軸受56はスプリング57によって駆動軸52の他端部側に付勢されているとともに駆動軸52の他端部に設けられた図示しないEリングによって駆動軸52から抜け出ないように構成されている。
【0007】
このような給紙機構51をADFの本体58に取付けるには、図10に示すように、軸受56を開口部58aに位置するように本体58に沿って移動させる。このとき、軸受56がスプリング57よって付勢されるため、軸受56が開口部58aに位置したときに軸受56が開口部58a内に挿入される(状態▲1▼)。
このとき、駆動軸52は開口部58a内に進入され、かつ駆動軸52が斜めになっていることから、駆動機構59と駆動軸52の一端部の間に一定の距離が確保されるため、駆動軸52を倒して駆動軸52の一端部を駆動機構59の係合穴59aに係合させて本体58に取付ける(状態▲2▼)。このとき、軸受56がスプリング57によって付勢されるため、駆動軸52が一端部側に移動して駆動軸52の一端部が駆動機構59に確実に連結されることにより、給紙機構51が本体58に取付けられる。
【0008】
また、給紙機構51をADFの本体58から取り外すには、図11に示すように、スプリング57の付勢力に抗して駆動軸52の開口部58a内に進入させる。このため、駆動軸52の一端部が係合穴59aから抜け出る(状態▲1▼)。
次いで、他端部側に支点にして駆動軸52を起して軸受56を開口部58aから抜くことにより(状態▲2▼)、給紙機構51を本体58から取り外す。
【0009】
【発明が解決しようとする課題】
しかしながら、このような従来のADFの給紙機構51にあっては、駆動軸52が偏心しないようにするために、軸受56の直径と開口部58aの開口径を略同じにしてガタが生じないようにする必要がある上に駆動軸52を斜めの状態にして軸受56を開口部58aに挿入しなければならないため、軸受56の挿入作業が面倒なものとなってしまった。このため、給紙機構51を本体58に取付ける作業が面倒なものとなってしまい、結果的にメンテナンス作業の作業性が悪化してしまうという問題が発生してしまった。
【0010】
また、軸受56の直径と開口部58aの開口径を略同じにする必要があるため、軸受の挿脱に伴って開口部58aの内周面や軸受56の外周面にバリが発生することかは、軸受56の挿入作業がより面倒となってしまい、このバリを抑える工夫を施しても基本的に軸受の挿入作業を向上させるには不十分であった。
そこで発明は、軸受部材を開口部に容易に挿入することができるようにして、給紙手段を本体に容易に取付けることができ、メンテナンス作業の作業性を向上させることができる自動原稿搬送装置の給紙機構を提供することを目的としている。
【0011】
【課題を解決するための手段】
請求項1記載の発明は、上記課題を解決するために、原稿の搬送路に対して上方に配設されるとともに駆動軸によって駆動力が伝達され、原稿載置台上に載置された原稿束を給紙して本自動原稿搬送装置の本体側に設けられた分離部材と共に該原稿束から最上位に位置する原稿を分離する給紙機構であって、前記駆動軸を前記本体に対して軸方向にスライドさせることにより、前記本体に脱着自在にした自動原稿搬送装置の給紙機構において、前記駆動軸の少なくとも一端部側に該駆動軸に沿って移動可能に設けられ、前記本体に形成された開口部に係合可能な軸受部材と、前記駆動軸に装着され、前記軸受部材を駆動軸の一端部外方に向かって付勢する付勢部材と、を備え、前記軸受部材の先端部を開口部の開口径よりも小径にするとともに、基端部に前記本体の内周面に当接するフランジ部を設け、前記フランジ部に、該フランジ部の放射方向に設けられた複数の突起からなり、該突起が本体に形成された複数の挿入孔に挿入され、前記駆動軸の回転によって前記軸受部材が連れ回りするのを防止する回り止め部を形成し、前記軸受部材を開口部に挿入したときに、前記本体の内周面に当接するフランジ部の外周端面Aと前記外周端面Aから最も離れた開口部の外周部Bを結んだ直線Cを半径として前記外周端面Aを中心とする円弧Dの範囲内に、前記軸受部材の先端部が位置するようにしたことを特徴としている。
【0012】
その場合、軸受部材の先端部が開口部の開口径よりも小さいため、軸受部材の挿入初期時に軸受部材が開口部にスムーズに挿入される。
また、軸受部材を開口部に挿入したときに、本体の内周面に当接するフランジ部の外周端面Aと外周端面Aから最も離れた開口部の外周部Bを結んだ直線Cを半径として外周端面Aを中心とする円弧Dの範囲内に軸受部材の先端部が位置するようにしたため、すなわち、軸受部材の開口部内への進入量が少なく、かつ、フランジ部が大きい程、軸受部材が開口部に引っ掛かることがないため、駆動軸を斜めの状態にして軸受部材を開口部に挿入したときに、軸受部材が開口部に引っ掛かるのを防止することができる。
【0013】
このため、駆動軸が斜めの状態にあっても挿入初期時に軸受部材を開口部にスムーズを挿入した後、軸受部材を開口部に引っ掛かけずにそのまま挿入することができる。この結果、軸受部材の挿入作業を容易に行なうことができ、給紙機構の取付作業の作業性を向上させて給紙機構のメンテナンス作業の作業性を向上させることができる。
【0014】
また、駆動軸の回転によって軸受部材が連れ回りするのを防止することができ、異音が発生するのを防止することができるとともに軸受部材が摩耗するのを防止して軸受部材の寿命を延ばすことができる。
【0015】
また、軸受部材を開口部に挿入したときに、フランジ部に形成された複数の突起を本体に形成された複数の挿入孔に挿入することができるため、軸受部材を所定量だけ回転させるだけで突起を挿入孔に簡単に挿入することができる。
【0016】
【発明の実施の形態】
以下、本発明の実施形態を図面に基づいて説明する。
図1〜6は本発明に係る自動原稿搬送装置の第1実施形態を示す図である。なお、本実施形態では、本発明の自動原稿搬送装置を画像処理装置としての複写機に装着した例を示しているが、画像処理装置としては、複写機の他にファクシミリ装置、プリンター装置、スキャナー装置等に適用することができる。
【0017】
まず、構成を説明する。図1、2において、1は複写機であり、この複写機1の上面にはコンタクトガラス2が設けられている。また、複写機1の上部にはADF3が設けられており、このADF3はコンタクトガラス2を開閉するように複写機1に図示しないヒンジ等を介して連結されている。
このADF3は、複数の原稿からなる原稿束Pを載置可能な原稿載置台としての原稿トレイ4と、原稿トレイ4に載置された原稿束から原稿を1枚ずつ分離してコンタクトガラス2に向かって搬送する分離・給紙手段5と、分離・給紙手段5によってコンタクトガラス2に向かって搬送された原稿をコンタクトガラス2上の露光位置に搬送・停止させるとともに、コンタクトガラス2の下方に配設された複写機1の読取手段(公知の露光ランプ、ミラー、レンズ、CCD等)により読取りが終了した原稿をコンタクトガラス2から搬出する搬入・搬出手段6と、搬入・搬出手段6によってコンタクトガラス2の露光位置から搬出された原稿を複写機1の側方から突出する第1排紙トレイ8または原稿トレイ4の下方に配設された第2排紙トレイ9の何れか一方に排紙する排紙手段7と、から構成されている。なお、第1排紙トレイ8はADF3の側方から突出するように設けても良い。
【0018】
分離・給紙手段5は、呼出しローラ10、給紙ベルト11、リバースローラ(分離阻止部材)12、ストップ爪14、プルアウト駆動ローラ13、プルアウト従動ローラ13aおよびレジストセンサ15から構成されている。これら呼出しローラ10、給紙ベルト11、リバースローラ12、プルアウト駆動ローラ13は図示しない給紙モータによって駆動され、この給紙モータとの間に動力伝達機構を介して接続されている。
【0019】
給紙モータが正転駆動されると、呼出しローラ10が時計方向に回転して原稿束Pから上層に位置する原稿が給紙されるとともに、給紙ベルト11およびリバースローラ12が時計方向に回転されて原稿束Pから最上位の原稿のみが分離される。この分離された原稿は反時計方向に回転するプルアウト駆動ローラ13とこれに連れ回りするプルアウト従動ローラ13aに挟持されて給紙ベルト11およびリバースローラ12から引抜かれてコンタクトガラス2に向かって搬送される。
【0020】
この原稿の先端がレジストセンサ15によって検知されると、給紙モータが逆転駆動し、このとき、給紙モータと呼出しローラ10、給紙ベルト11、リバースローラ12およびプルアウト駆動ローラ13の間に介装された駆動系により呼出しローラ10と給紙ベルト11が停止され、プルアウト駆動ローラ13が反時計方向に継続して回転されるとともにリバースローラ12が時計方向に継続して回転されることにより、後続する原稿が給紙ローラ12とリバースローラ12のニップ部に進入するのを防止して分離されないようになっている。
【0021】
また、ストッパ爪14は給紙ベルト11に対して原稿の搬送方向下流側に設けられており、このストッパ爪14は原稿束Pの先端に当接して原稿束Pが給紙ベルト11側に進入するのを防止するものである。
本実施形態では、呼出しローラ10および給紙ベルト11が原稿の搬送路に対して上方に配設されているとともに、リバースローラ12は原稿の搬送路に対して下方に配設されている。そして、呼出しローラ10、給紙ベルト11が給紙機構を構成し、ADF3に対して脱着自在になっている。以下、給紙機構を図3〜5に基づいて詳しく説明する。
【0022】
図3〜6において、21は給紙機構であり、この給紙機構21は一端部でADFの本体22側に設けられ、駆動モータによって駆動力が減速されて伝達される動力伝達機構の一部を構成する駆動部材23の係合穴23aに係合される駆動軸24を有し、この駆動軸24の一端部に設けられたピン24aを係合穴23aに係合して本体24に取付けることにより、駆動部材23から駆動軸24に駆動力が伝達されるようになっている。
【0023】
この駆動軸24の略中央部には給紙ベルト保持ブラケット25が装着されており、このブラケット25内には給紙ベルト114および呼出しローラ10が収納されている。給紙ベルト11は駆動軸24に一体的に取付けられた駆動ローラ26と給紙ベルト11の周回移動に連れ回りする従動ローラ27(図2参照)に橋架されているとともに、呼出しローラ10はタイミングベルトを介して駆動ローラ26に連結されている。なお、呼出しローラ10の駆動源は駆動ローラ26ではなく、独立した動力伝達手段であっても良い。
【0024】
また、駆動軸24にはブラケット25を挟んで給紙ガイド28a、28bが取付けられており、この給紙ガイド28a、28bは原稿の搬送路の一部を構成し、図2に示す下側ガイド板20との間で原稿をガイドして、給紙ベルト11とリバースローラ12の間に原稿を案内するものである。
また、駆動軸24の他端部には軸29が駆動軸24の軸方向に沿って摺動可能なように設けられており、この軸受部材29は本体22に形成された開口部22aに挿入されるようになっている。
【0025】
また、軸受部材29と給紙ガイド28aの間にはスプリング(付勢部材)30が介装されており、このスプリング30は軸受部材29を駆動軸24の他端部外方(請求項の一端部外方に対応)に付勢している。また、駆動軸24の他端部には図示しないEリングが設けられており、軸受部材24はEリングによって駆動軸24から抜け出ないようになっている。
【0026】
一方、軸受部材29の先端部は所定の曲率で湾曲された湾曲部29aを有しており、この湾曲部29aは開口部22aの開口径よりも小径に形成されている。また、軸受部材29の基端部にはフランジ部29bが設けられており、このフランジ部29bは本体22の内周面に当接するようになっている。
また、湾曲部29aは、軸受部材29が開口部22aに挿入されたときに、本体22の内周面に当接するフランジ部29bの外周端面Aとこの外周端面Aから最も離れた開口部22aの外周部Bを結んだ直線Cを半径として外周端面Aを中心とする円弧Dの範囲内に位置するようになっている。
【0027】
なお、湾曲部29aを円弧Dの範囲内に位置させるには、フランジ部29bの大きさと開口部22aに対して本体22の外方に突出する軸受部材29の突出高さhを調整することにより達成される。
次に、作用を説明する。
このような給紙機構21をADFの本体22に取付けるには、軸受部材29を開口部22aに位置するように本体22の内周面に沿って移動させる。このとき、軸受部材29がスプリング30よって付勢されるため、軸受部材29が開口部22aに位置したときに駆動軸24が軸方向にスライドされ、軸受部材29が開口部22a内に挿入される。
【0028】
このとき、駆動軸24は開口部22a内に進入され、かつ図6に示すように駆動軸24が斜めになっていることから、駆動部材23と駆動軸24の一端部の間に一定の距離が確保されるため、駆動軸24を倒して駆動軸24の一端部を駆動部材23の係合穴23aに係合させて本体22に取付ける。このとき、軸受部材29がスプリング30によって付勢されるため、駆動軸24が一端部側に移動して駆動軸24の一端部が駆動部材23に確実に連結されることにより、給紙機構21が本体22に取付けられる。
【0029】
一方、給紙機構21をADFの本体22から取り外すには、スプリング30の付勢力に抗して駆動軸24を軸方向にスライドさせて開口部22a内に進入させる。このため、駆動軸24の一端部が係合穴23aから抜け出る。次いで、駆動軸24の他端部側に支点にして図6に示すように駆動軸24を起して軸受部材29を開口部22aから抜くことにより、給紙機構21を本体22から取り外す。
【0030】
本実施形態では、軸受部材29の先端部を開口部22aの開口径よりも小さくしたため、軸受部材29の挿入初期時に軸受部材29を開口部22aにスムーズに挿入することができる。
また、軸受部材29を開口部22aに挿入したときに、本体22の内周面に当接するフランジ部29bの外周端面Aと外周端面Aから最も離れた開口部の外周部Bを結んだ直線Cを半径として外周端面Aを中心とする円弧Dの範囲内に軸受部材29の先端部を位置するようにしたため、すなわち、軸受部材29の開口部22a内への進入量が少なく、かつ、フランジ部29bが大きい程、軸受部材29が開口部22aに引っ掛かることがないため、駆動軸24を斜めの状態にして軸受部材29を開口部22aに挿入したときに、軸受部材29が開口部22aに引っ掛かるのを防止することができる。
【0031】
このため、駆動軸24が斜めの状態にあっても挿入初期時に軸受部材29を開口部22aにスムーズを挿入した後、軸受部材29を開口部22aに引っ掛かけずにそのまま挿入することができる。この結果、軸受部材29の挿入作業を容易に行なうことができ、給紙機構21の取付作業の作業性を向上させて給紙機構のメンテナンス作業の作業性を向上させることができる。
【0032】
図7は本発明に係る自動原稿搬送装置の第2実施形態を示す図である。なお、本実施形態では、フランジ部に回り止め部を形成した点が第1実施形態と異なるのみでその他の構成は同一であるため、異なる構成部分のみを説明する。
図7において、フランジ部29bには放射方向に回り止め部を構成する複数の突起31が設けられており、この突起31は本体22に形成された複数の挿入孔22bに挿入されるようになっている。
【0033】
このため、軸受部材29を開口部22aに挿入したときに、フランジ部29bに形成された複数の突起31を本体22に形成された複数の挿入孔22bに挿入することができるため、軸受部材29を所定量だけ回転させるだけで突起31を挿入孔22bに簡単に挿入することができる。
また、駆動軸24の回転によって軸受部材29が連れ回りするのを防止することができ、異音が発生するのを防止することができるとともに軸受部材29が摩耗するのを防止して軸受部材29の寿命を延ばすことができる。
【0034】
【発明の効果】
発明によれば、軸受部材の先端部が開口部の開口径よりも小さいため、軸受部材の挿入初期時に軸受部材が開口部にスムーズに挿入される。
また、軸受部材を開口部に挿入したときに、本体の内周面に当接するフランジ部の外周端面Aと外周端面Aから最も離れた開口部の外周部Bを結んだ直線Cを半径として外周端面Aを中心とする円弧Dの範囲内に軸受部材の先端部が位置するようにしたため、すなわち、軸受部材の開口部内への進入量が少なく、かつ、フランジ部が大きい程、軸受部材が開口部に引っ掛かることがないため、駆動軸を斜めの状態にして軸受部材を開口部に挿入したときに、軸受部材が開口部に引っ掛かるのを防止することができる。
【0035】
このため、駆動軸が斜めの状態にあっても挿入初期時に軸受部材を開口部にスムーズを挿入した後、軸受部材を開口部に引っ掛かけずにそのまま挿入することができる。この結果、軸受部材の挿入作業を容易に行なうことができ、給紙機構の取付作業の作業性を向上させて給紙機構のメンテナンス作業の作業性を向上させることができる。
【0036】
また、本発明によれば、駆動軸の回転によって軸受部材が連れ回りするのを防止することができ、異音が発生するのを防止することができるとともに軸受部材が摩耗するのを防止して軸受部材の寿命を延ばすことができる。
また、本発明によれば、軸受部材を開口部に挿入したときに、フランジ部に形成された複数の突起を本体に形成された複数の挿入孔に挿入することができるため、軸受部材を所定量だけ回転させるだけで突起を挿入孔に簡単に挿入することができる。
【図面の簡単な説明】
【図1】本発明に係る給紙機構が装着される自動原稿搬送装置の一実施形態の概略図である。
【図2】一実施形態の分離・給紙手段の概略側面図である。
【図3】一実施形態の給紙機構の斜視図である。
【図4】(a)は一実施形態の軸受部材を開口部に挿入する直前の状態を示す給紙機構の要部斜視図、(b)は開口部に挿入される直前の軸受部材の上面図である。
【図5】軸受部材と開口部との関係を示す図である。
【図6】給紙機構をADFの本体に脱着させるときのある瞬間の給紙機構の状態を示す図である。
【図7】本発明に係る自動原稿搬送装置の給紙機構の第2実施形態を示す図であり、(a)は軸受部材と本体の構成図、(b)は軸受部材の拡大図である。
【図8】従来の給紙機構の斜視図である。
【図9】軸受を開口部に挿入する直前の従来の給紙機構の要部斜視図である。
【図10】給紙機構を本体に取付ける状態を示す図である。
【図11】給紙機構を本体から外す状態を示す図である。
【符号の説明】
3 ADF(自動原稿搬送装置)
4 原稿トレイ(原稿載置台)
21 給紙機構
22 本体
22a 開口部
24 駆動軸
29 軸受部材
30 スプリング(付勢部材)
31 突起(回り止め部)
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a paper feed mechanism of an automatic document feeder provided in an image processing apparatus such as a copying machine, a facsimile machine, a printer, and a scanner. The present invention relates to a paper feed mechanism of an automatic document feeder that can be attached to and detached from the main body by sliding in a direction.
[0002]
[Prior art]
Recently, image processing apparatuses such as copiers, facsimile machines, printers, and scanners have been required to be faster, more multifunctional, and more space-saving. There has been an increasing demand for space saving in an automatic document feeder (hereinafter, simply referred to as ADF) provided in the apparatus.
[0003]
In order to satisfy such demands, in the case of an ADF, a turn sheet feeder that separates a document bundle including a plurality of documents placed on a document table and conveys it to an exposure position via a reversing path is used. Is performed, and thereby the length in the width direction is shortened.
By the way, in such a turn sheet feeding, since a document is placed on a document placing table with a document face upward, a call roller or a sheet feeding belt is used as a sheet feeding means for feeding the document. The paper feed belt is provided above the conveyance path of the document, and after feeding a bundle of documents by a call roller, the paper feed belt is moved around in the paper feeding direction and the paper supply belt provided below the conveyance path. The document is separated by a separation roller that slides in the separation direction while sliding on the document.
[0004]
Since the paper feed belt needs to be periodically replaced, the paper feed belt is configured to be easily detachable from the ADF main body so that maintenance can be performed efficiently. The configuration shown in FIG.
In FIG. 8, reference numeral 51 denotes a paper feed mechanism. The paper feed mechanism 51 has a drive shaft 52 that is engaged at one end thereof with an engagement hole 59a of a drive mechanism 59 provided on the main body 58 side of the ADF. A driving force is transmitted from the driving mechanism 59 to the driving shaft 52 by engaging a pin 52 a provided at one end of the driving shaft 52 with the engaging hole 59 a and attaching the pin 52 a to the main body 58.
[0005]
A paper feed belt holding bracket 53 is mounted substantially at the center of the drive shaft 52, and a paper feed belt 54 and a call roller 55 are accommodated in the bracket 53, and the paper feed belt 54 is integrated with the drive shaft 52. The driving roller is attached to a driven roller and a driven roller that rotates with the orbital movement of the paper feeding belt 54, and the call roller 55 is connected to the driving roller via a timing belt.
[0006]
At the other end of the drive shaft 52, a bearing 56 is provided movably on the drive shaft 52, and this bearing 56 is inserted into an opening 58a formed in the main body 58 as shown in FIG. It has become.
The bearing 56 is urged toward the other end of the drive shaft 52 by a spring 57, and is configured not to fall out of the drive shaft 52 by an E-ring (not shown) provided at the other end of the drive shaft 52. .
[0007]
In order to attach such a paper feeding mechanism 51 to the main body 58 of the ADF, as shown in FIG. 10, the bearing 56 is moved along the main body 58 so as to be located at the opening 58a. At this time, since the bearing 56 is urged by the spring 57, the bearing 56 is inserted into the opening 58a when the bearing 56 is located in the opening 58a (state (1)).
At this time, since the drive shaft 52 enters the opening 58a and the drive shaft 52 is inclined, a certain distance is secured between the drive mechanism 59 and one end of the drive shaft 52. The drive shaft 52 is tilted so that one end of the drive shaft 52 is engaged with the engagement hole 59a of the drive mechanism 59 and attached to the main body 58 (state (2)). At this time, since the bearing 56 is urged by the spring 57, the drive shaft 52 moves to one end side, and one end of the drive shaft 52 is securely connected to the drive mechanism 59, so that the paper feed mechanism 51 is moved. It is attached to the main body 58.
[0008]
To remove the paper feed mechanism 51 from the main body 58 of the ADF, as shown in FIG. 11, the paper feed mechanism 51 is advanced into the opening 58a of the drive shaft 52 against the urging force of the spring 57. Thus, one end of the drive shaft 52 comes out of the engagement hole 59a (state (1)).
Next, the drive shaft 52 is raised with the other end as a fulcrum, and the bearing 56 is pulled out from the opening 58a (state (2)), whereby the paper feed mechanism 51 is removed from the main body 58.
[0009]
[Problems to be solved by the invention]
However, in such a conventional ADF paper feeding mechanism 51, in order to prevent the drive shaft 52 from being eccentric, the diameter of the bearing 56 and the opening diameter of the opening 58a are made substantially the same, so that there is no play. In addition, it is necessary to insert the bearing 56 into the opening 58a while keeping the drive shaft 52 in an oblique state, so that the operation of inserting the bearing 56 is troublesome. For this reason, the work of attaching the paper feed mechanism 51 to the main body 58 becomes troublesome, and as a result, the problem that the workability of the maintenance work is deteriorated has occurred.
[0010]
Further, since it is necessary to make the diameter of the bearing 56 and the opening diameter of the opening 58a substantially the same, it is necessary to check whether burrs are generated on the inner peripheral surface of the opening 58a or the outer peripheral surface of the bearing 56 as the bearing is inserted or removed. However, the operation of inserting the bearing 56 becomes more troublesome, and even if a device for suppressing this burr is taken, it is basically insufficient to improve the operation of inserting the bearing.
Therefore, the present invention provides an automatic document feeder that can easily insert a bearing member into an opening, can easily attach a paper feeding unit to a main body, and can improve workability of maintenance work. It is intended to provide a paper feeding mechanism.
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention according to claim 1 is arranged above a document conveying path, a driving force is transmitted by a driving shaft, and a document bundle placed on a document table. And a separating member provided on the main body side of the automatic document feeder to separate the uppermost document from the document bundle, wherein the drive shaft is In the paper feed mechanism of the automatic document feeder detachably attached to the main body by being slid in the main body, the paper feed mechanism is provided on at least one end side of the drive shaft so as to be movable along the drive shaft, and is formed on the main body. And a biasing member mounted on the drive shaft and biasing the bearing member outwardly at one end of the drive shaft, the distal end of the bearing member. Is smaller than the opening diameter of the opening. The flange portion abuts on the inner circumferential surface of the body to the proximal end portion, said flange portion, a plurality of protrusions formed in a radial direction of the flange portion, a plurality of which are formed on the projecting Kiga body A detent portion is inserted into the insertion hole to prevent the bearing member from rotating with the rotation of the drive shaft, and is formed on the inner peripheral surface of the main body when the bearing member is inserted into the opening. The tip of the bearing member is set within a range of an arc D centered on the outer peripheral end surface A with a radius as a radius of a straight line C connecting an outer peripheral end surface A of the contacting flange portion and an outer peripheral portion B of the opening farthest from the outer peripheral end surface A. It is characterized in that the part is located.
[0012]
In this case, since the distal end of the bearing member is smaller than the opening diameter of the opening, the bearing member is smoothly inserted into the opening at the initial stage of insertion of the bearing member.
Further, when the bearing member is inserted into the opening, the outer periphery is defined by a straight line C connecting the outer peripheral end surface A of the flange portion in contact with the inner peripheral surface of the main body and the outer peripheral portion B of the opening portion farthest from the outer peripheral end surface A. Because the distal end of the bearing member is located within the range of the arc D centered on the end face A, that is, the smaller the amount of penetration of the bearing member into the opening and the larger the flange portion, the more the bearing member is opened. Since the bearing member is not caught in the opening, the bearing member can be prevented from being caught in the opening when the drive shaft is inclined and the bearing member is inserted into the opening.
[0013]
For this reason, even if the drive shaft is inclined, after the bearing member is smoothly inserted into the opening at the initial stage of insertion, the bearing member can be inserted as it is without being caught in the opening. As a result, the operation of inserting the bearing member can be easily performed, the workability of the work of attaching the paper feeding mechanism can be improved, and the workability of the maintenance work of the paper feeding mechanism can be improved.
[0014]
Further , it is possible to prevent the bearing member from rotating along with the rotation of the drive shaft, thereby preventing generation of abnormal noise and prolonging the life of the bearing member by preventing the bearing member from being worn. be able to.
[0015]
In addition , when the bearing member is inserted into the opening, the plurality of protrusions formed on the flange portion can be inserted into the plurality of insertion holes formed on the main body. The projection can be easily inserted into the insertion hole.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 6 show a first embodiment of the automatic document feeder according to the present invention. In this embodiment, an example in which the automatic document feeder of the present invention is mounted on a copying machine as an image processing apparatus is shown. However, as the image processing apparatus, a facsimile apparatus, a printer apparatus, a scanner It can be applied to devices and the like.
[0017]
First, the configuration will be described. 1 and 2, reference numeral 1 denotes a copying machine, and a contact glass 2 is provided on an upper surface of the copying machine 1. An ADF 3 is provided at an upper portion of the copying machine 1. The ADF 3 is connected to the copying machine 1 via a hinge (not shown) so as to open and close the contact glass 2.
The ADF 3 includes a document tray 4 serving as a document mounting table on which a document bundle P including a plurality of documents can be placed, and a document separated from the document bundle placed on the document tray 4 one by one on the contact glass 2. Separating / feeding means 5 for transporting the document toward the contact glass 2 by the separating / feeding means 5 to transport / stop the original to the exposure position on the contact glass 2; A loading / unloading unit 6 for unloading a document, which has been read by a reading unit (a well-known exposure lamp, mirror, lens, CCD, or the like) of the copying machine 1, from the contact glass 2, and a contact by the loading / unloading unit 6. A document discharged from the exposure position of the glass 2 is projected from a side of the copying machine 1 to a first discharge tray 8 or a second discharge tray disposed below the document tray 4. And discharge means 7 for discharging either one of 9, and a. The first paper discharge tray 8 may be provided so as to protrude from the side of the ADF 3.
[0018]
The separating / feeding means 5 includes a call roller 10, a feed belt 11, a reverse roller (separation preventing member) 12, a stop claw 14, a pull-out driving roller 13, a pull-out driven roller 13a, and a registration sensor 15. The call roller 10, the paper feed belt 11, the reverse roller 12, and the pull-out drive roller 13 are driven by a paper feed motor (not shown), and are connected to the paper feed motor via a power transmission mechanism.
[0019]
When the paper feed motor is driven to rotate forward, the call-up roller 10 rotates clockwise to feed the upper-layer document from the document bundle P, and the paper feed belt 11 and the reverse roller 12 rotate clockwise. Then, only the top document is separated from the document bundle P. The separated document is sandwiched between a pull-out driving roller 13 rotating in a counterclockwise direction and a pull-out driven roller 13a rotating therewith, pulled out from the sheet feeding belt 11 and the reverse roller 12, and conveyed toward the contact glass 2. You.
[0020]
When the leading edge of the document is detected by the registration sensor 15, the paper feed motor is driven to rotate in a reverse direction, and at this time, a feed roller 10, a paper feed belt 11, a reverse roller 12, and a pull-out drive roller 13 are interposed. The pull-out drive roller 13 is continuously rotated in the counterclockwise direction while the reverse roller 12 is continuously rotated in the clockwise direction. Subsequent documents are prevented from entering the nip portion between the feed roller 12 and the reverse roller 12 so that they are not separated.
[0021]
The stopper claw 14 is provided on the downstream side in the document conveying direction with respect to the paper feed belt 11, and the stopper claw 14 comes into contact with the leading end of the document bundle P so that the document bundle P enters the paper feed belt 11 side. It is to prevent that.
In the present embodiment, the call roller 10 and the paper feed belt 11 are disposed above the document conveyance path, and the reverse roller 12 is disposed below the document conveyance path. The call roller 10 and the paper feed belt 11 constitute a paper feed mechanism, and are detachable from the ADF 3. Hereinafter, the paper feeding mechanism will be described in detail with reference to FIGS.
[0022]
3 to 6, reference numeral 21 denotes a paper feed mechanism. The paper feed mechanism 21 is provided at one end thereof on the main body 22 side of the ADF, and is a part of a power transmission mechanism in which a driving force is reduced and transmitted by a driving motor. And a drive shaft 24 to be engaged with the engagement hole 23a of the drive member 23. A pin 24a provided at one end of the drive shaft 24 is engaged with the engagement hole 23a and attached to the main body 24. Thus, the driving force is transmitted from the driving member 23 to the driving shaft 24.
[0023]
A paper feed belt holding bracket 25 is mounted substantially at the center of the drive shaft 24, and the paper feed belt 114 and the call roller 10 are housed in the bracket 25. The paper feed belt 11 is bridged by a drive roller 26 integrally attached to a drive shaft 24 and a driven roller 27 (see FIG. 2) that rotates along with the orbital movement of the paper feed belt 11, and the call roller 10 is driven by a timing. It is connected to the drive roller 26 via a belt. The drive source of the call roller 10 may be an independent power transmission means instead of the drive roller 26.
[0024]
Further, paper feed guides 28a and 28b are attached to the drive shaft 24 with a bracket 25 interposed therebetween. The paper feed guides 28a and 28b constitute a part of a document conveyance path, and a lower guide shown in FIG. The document is guided between the plate 20 and the sheet between the sheet feeding belt 11 and the reverse roller 12.
A shaft 29 is provided at the other end of the drive shaft 24 so as to be slidable along the axial direction of the drive shaft 24, and this bearing member 29 is inserted into an opening 22 a formed in the main body 22. It is supposed to be.
[0025]
A spring (biasing member) 30 is interposed between the bearing member 29 and the paper feed guide 28a, and the spring 30 moves the bearing member 29 to the outside of the other end of the drive shaft 24 (one end of the claim). (Corresponds to outsiders). An E-ring (not shown) is provided at the other end of the drive shaft 24 so that the bearing member 24 does not come off the drive shaft 24 by the E-ring.
[0026]
On the other hand, the distal end of the bearing member 29 has a curved portion 29a curved at a predetermined curvature, and the curved portion 29a is formed to have a smaller diameter than the opening diameter of the opening 22a. Further, a flange portion 29 b is provided at a base end of the bearing member 29, and the flange portion 29 b comes into contact with the inner peripheral surface of the main body 22.
Also, when the bearing member 29 is inserted into the opening 22a, the curved portion 29a is formed between the outer peripheral end surface A of the flange portion 29b abutting on the inner peripheral surface of the main body 22 and the opening 22a farthest from the outer peripheral end surface A. It is located within a range of a circular arc D centered on the outer peripheral end face A with a straight line C connecting the outer peripheral parts B as a radius.
[0027]
In order to position the curved portion 29a within the range of the circular arc D, the size of the flange portion 29b and the protrusion height h of the bearing member 29 protruding outward from the main body 22 with respect to the opening portion 22a are adjusted. Achieved.
Next, the operation will be described.
In order to attach such a paper feed mechanism 21 to the main body 22 of the ADF, the bearing member 29 is moved along the inner peripheral surface of the main body 22 so as to be located at the opening 22a. At this time, since the bearing member 29 is urged by the spring 30, the drive shaft 24 is slid in the axial direction when the bearing member 29 is located in the opening 22a, and the bearing member 29 is inserted into the opening 22a. .
[0028]
At this time, since the drive shaft 24 enters the opening 22a and the drive shaft 24 is inclined as shown in FIG. 6, a certain distance is provided between the drive member 23 and one end of the drive shaft 24. Therefore, the drive shaft 24 is tilted, and one end of the drive shaft 24 is engaged with the engagement hole 23 a of the drive member 23, and the drive shaft 24 is attached to the main body 22. At this time, since the bearing member 29 is urged by the spring 30, the drive shaft 24 moves to one end side, and one end of the drive shaft 24 is securely connected to the drive member 23, so that the paper feed mechanism 21 Is attached to the main body 22.
[0029]
On the other hand, in order to remove the paper feeding mechanism 21 from the main body 22 of the ADF, the drive shaft 24 is slid in the axial direction against the urging force of the spring 30 to enter the opening 22a. Therefore, one end of the drive shaft 24 comes out of the engagement hole 23a. Next, as shown in FIG. 6, the drive shaft 24 is raised and the bearing member 29 is pulled out from the opening 22 a using the fulcrum at the other end of the drive shaft 24, thereby removing the paper feed mechanism 21 from the main body 22.
[0030]
In the present embodiment, since the distal end of the bearing member 29 is smaller than the opening diameter of the opening 22a, the bearing member 29 can be smoothly inserted into the opening 22a at the initial stage of insertion of the bearing member 29.
Further, when the bearing member 29 is inserted into the opening 22a, a straight line C connecting the outer peripheral end surface A of the flange portion 29b abutting against the inner peripheral surface of the main body 22 and the outer peripheral portion B of the opening farthest from the outer peripheral end surface A. , The tip of the bearing member 29 is located within the range of the arc D centered on the outer peripheral end face A, that is, the amount of entry of the bearing member 29 into the opening 22a is small and the flange portion The larger the size of 29b, the more the bearing member 29 is not caught in the opening 22a. Therefore, when the drive shaft 24 is inclined and the bearing member 29 is inserted into the opening 22a, the bearing member 29 is caught in the opening 22a. Can be prevented.
[0031]
For this reason, even if the drive shaft 24 is inclined, after the bearing member 29 is smoothly inserted into the opening 22a at the initial stage of insertion, the bearing member 29 can be inserted as it is without being caught in the opening 22a. . As a result, the work of inserting the bearing member 29 can be easily performed, and the workability of the work of mounting the paper feeding mechanism 21 can be improved, thereby improving the workability of the maintenance work of the paper feed mechanism.
[0032]
FIG. 7 is a view showing a second embodiment of the automatic document feeder according to the present invention. In the present embodiment, only the difference is that a rotation preventing portion is formed in the flange portion from the first embodiment, and other configurations are the same. Therefore, only different components will be described.
In FIG. 7, a plurality of protrusions 31 forming a rotation preventing portion are provided on the flange portion 29 b in the radial direction, and the protrusions 31 are inserted into a plurality of insertion holes 22 b formed in the main body 22. ing.
[0033]
For this reason, when the bearing member 29 is inserted into the opening 22a, the plurality of projections 31 formed on the flange portion 29b can be inserted into the plurality of insertion holes 22b formed on the main body 22. The protrusion 31 can be easily inserted into the insertion hole 22b only by rotating the protrusion 31 by a predetermined amount.
In addition, the bearing member 29 can be prevented from rotating together with the rotation of the drive shaft 24, so that the generation of abnormal noise can be prevented, and the bearing member 29 can be prevented from being worn. Life can be extended.
[0034]
【The invention's effect】
According to the present invention, since the distal end of the bearing member is smaller than the opening diameter of the opening, the bearing member can be smoothly inserted into the opening at the initial stage of insertion of the bearing member.
Further, when the bearing member is inserted into the opening, the outer periphery is defined by a straight line C connecting the outer peripheral end surface A of the flange portion in contact with the inner peripheral surface of the main body and the outer peripheral portion B of the opening portion farthest from the outer peripheral end surface A. Because the distal end of the bearing member is located within the range of the arc D centered on the end face A, that is, the smaller the amount of penetration of the bearing member into the opening and the larger the flange portion, the more the bearing member is opened. Since the bearing member is not caught in the opening, the bearing member can be prevented from being caught in the opening when the drive shaft is inclined and the bearing member is inserted into the opening.
[0035]
For this reason, even if the drive shaft is inclined, after the bearing member is smoothly inserted into the opening at the initial stage of insertion, the bearing member can be inserted as it is without being caught in the opening. As a result, the operation of inserting the bearing member can be easily performed, the workability of the work of attaching the paper feeding mechanism can be improved, and the workability of the maintenance work of the paper feeding mechanism can be improved.
[0036]
Further , according to the present invention, it is possible to prevent the bearing member from rotating with the rotation of the drive shaft, thereby preventing generation of abnormal noise and preventing the bearing member from being worn. The life of the bearing member can be extended.
Further , according to the present invention, when the bearing member is inserted into the opening, the plurality of protrusions formed on the flange portion can be inserted into the plurality of insertion holes formed on the main body. The projection can be easily inserted into the insertion hole only by rotating by a fixed amount.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of an embodiment of an automatic document feeder to which a paper feed mechanism according to the present invention is mounted.
FIG. 2 is a schematic side view of a separating / feeding unit according to one embodiment.
FIG. 3 is a perspective view of a sheet feeding mechanism according to one embodiment.
FIG. 4A is a perspective view of a main part of a sheet feeding mechanism showing a state immediately before a bearing member according to an embodiment is inserted into an opening, and FIG. 4B is an upper surface of the bearing member immediately before being inserted into the opening; FIG.
FIG. 5 is a diagram showing a relationship between a bearing member and an opening.
FIG. 6 is a diagram illustrating a state of the sheet feeding mechanism at a certain moment when the sheet feeding mechanism is attached to and detached from the main body of the ADF.
FIGS. 7A and 7B are diagrams showing a second embodiment of the paper feed mechanism of the automatic document feeder according to the present invention, wherein FIG. 7A is a configuration diagram of a bearing member and a main body, and FIG. 7B is an enlarged view of the bearing member. .
FIG. 8 is a perspective view of a conventional paper feed mechanism.
FIG. 9 is a perspective view of a main part of a conventional paper feeding mechanism immediately before inserting a bearing into an opening.
FIG. 10 is a diagram illustrating a state in which a sheet feeding mechanism is attached to a main body.
FIG. 11 is a diagram illustrating a state in which a sheet feeding mechanism is removed from a main body.
[Explanation of symbols]
3 ADF (automatic document feeder)
4 Document tray (document mounting table)
21 sheet feeding mechanism 22 main body 22a opening 24 drive shaft 29 bearing member 30 spring (biasing member)
31 Projection (rotation stop)

Claims (1)

原稿の搬送路に対して上方に配設されるとともに駆動軸によって駆動力が伝達され、原稿載置台上に載置された原稿束を給紙して本自動原稿搬送装置の本体側に設けられた分離部材と共に該原稿束から最上位に位置する原稿を分離する給紙機構であって、
前記駆動軸を前記本体に対して軸方向にスライドさせることにより、前記本体に脱着自在にした自動原稿搬送装置の給紙機構において、
前記駆動軸の少なくとも一端部側に該駆動軸に沿って移動可能に設けられ、前記本体に形成された開口部に係合可能な軸受部材と、
前記駆動軸に装着され、前記軸受部材を駆動軸の一端部外方に向かって付勢する付勢部材と、を備え、
前記軸受部材の先端部を開口部の開口径よりも小径にするとともに、基端部に前記本体の内周面に当接するフランジ部を設け、
前記フランジ部に、該フランジ部の放射方向に設けられた複数の突起からなり、該突起が本体に形成された複数の挿入孔に挿入され、前記駆動軸の回転によって前記軸受部材が連れ回りするのを防止する回り止め部を形成し、
前記軸受部材を開口部に挿入したときに、前記本体の内周面に当接するフランジ部の外周端面Aと前記外周端面Aから最も離れた開口部の外周部Bを結んだ直線Cを半径として前記外周端面Aを中心とする円弧Dの範囲内に、前記軸受部材の先端部が位置するようにしたことを特徴とする自動原稿搬送装置の給紙機構。
It is disposed above the document conveyance path, and the driving force is transmitted by a drive shaft, and feeds a bundle of documents placed on a document table and is provided on the main body side of the automatic document feeder. A sheet feeding mechanism for separating the uppermost document from the document bundle together with the separating member.
By sliding the drive shaft in the axial direction with respect to the main body, in the paper feed mechanism of the automatic document feeder detachably attached to the main body,
A bearing member movably provided along at least one end of the drive shaft along the drive shaft, and engageable with an opening formed in the main body;
An urging member mounted on the drive shaft, for urging the bearing member outwardly from one end of the drive shaft,
The distal end of the bearing member is made smaller in diameter than the opening diameter of the opening, and a flange is provided at the base end in contact with the inner peripheral surface of the main body,
The flange portion includes a plurality of protrusions provided in a radial direction of the flange portion, and the protrusions are inserted into a plurality of insertion holes formed in the main body, and the bearing member rotates with the rotation of the drive shaft. Forming a detent part to prevent
When the bearing member is inserted into the opening, a straight line C connecting the outer peripheral end surface A of the flange portion in contact with the inner peripheral surface of the main body and the outer peripheral portion B of the opening portion farthest from the outer peripheral end surface A is defined as a radius. A paper feed mechanism for an automatic document feeder, wherein the distal end of the bearing member is located within a range of an arc D centered on the outer peripheral end face A.
JP08806197A 1997-04-07 1997-04-07 Paper feed mechanism of automatic document feeder Expired - Fee Related JP3553313B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP08806197A JP3553313B2 (en) 1997-04-07 1997-04-07 Paper feed mechanism of automatic document feeder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP08806197A JP3553313B2 (en) 1997-04-07 1997-04-07 Paper feed mechanism of automatic document feeder

Publications (2)

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JPH10279097A JPH10279097A (en) 1998-10-20
JP3553313B2 true JP3553313B2 (en) 2004-08-11

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007068023A (en) * 2005-09-01 2007-03-15 Ricoh Co Ltd Document feeder, document feeding and reading unit and copier using the same

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
JP4548772B2 (en) * 2004-06-28 2010-09-22 株式会社リコー Process cartridge and image forming apparatus
JP4610497B2 (en) * 2006-02-13 2011-01-12 キヤノン電子株式会社 Sheet feeding apparatus and image reading apparatus
JP2010150022A (en) * 2008-12-26 2010-07-08 Ricoh Co Ltd Paper aligning device, paper stacking device, and image forming device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007068023A (en) * 2005-09-01 2007-03-15 Ricoh Co Ltd Document feeder, document feeding and reading unit and copier using the same
JP4588588B2 (en) * 2005-09-01 2010-12-01 株式会社リコー Document transport device, document transport reading unit and copier using the same

Also Published As

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