JP2004043111A - Paper reversing device and its method - Google Patents

Paper reversing device and its method Download PDF

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Publication number
JP2004043111A
JP2004043111A JP2002203074A JP2002203074A JP2004043111A JP 2004043111 A JP2004043111 A JP 2004043111A JP 2002203074 A JP2002203074 A JP 2002203074A JP 2002203074 A JP2002203074 A JP 2002203074A JP 2004043111 A JP2004043111 A JP 2004043111A
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Japan
Prior art keywords
sheet
transport
paper
reversing device
suction
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JP2002203074A
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JP3990216B2 (en
Inventor
Masafumi Fukumoto
福本 雅文
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Duplo Seiko Corp
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Duplo Seiko Corp
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  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Registering Or Overturning Sheets (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper reversing device which has a small number of components, consists of simple structure, and reverses a paper sheet at a high speed continuously. <P>SOLUTION: The device is equipped with a first conveyance means 10 which conveys the paper sheet 2 having a first end part 3 and a second end part 5 opposing to the first end part 3 to the first conveyance direction P<SB>1</SB>with the first end part 3 in the lead, a locking means 18 which is provided at the front end of the first conveyance means 10 and locks the first end part 3, and a second conveyance means 20 which sucks and conveys the paper sheet 2 in the second conveyance direction P<SB>2</SB>intersecting with the first conveyance direction P<SB>1</SB>with the second end part 5 in the lead. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、孔版印刷機や複写機等の画像形成機における用紙反転装置及び用紙反転方法に関する。
【0002】
【従来の技術】
画像形成機において、画像の転写された用紙は、通常、画像転写面を上にして排出されるが、丁合のために用紙の表裏を反転させた状態で排出されることがある。また、用紙の両面(表裏)に画像を転写するために、一面(表面)に画像を転写したあとに用紙を反転させて他面(裏面)に画像を転写することが行われている。
【0003】
例えば、特開昭56−122761号公報には、図1に示すような用紙反転機構が開示されている。図1に示した用紙反転機構では、水平搬送手段110の途中位置に垂直搬送手段120が配設されている。垂直搬送手段120の手前側近傍には、大略三角形状をした分岐爪150が搖動軸152を中心に搖動可能に配設されている。
【0004】
図1において、用紙102が左から右に搬送される際、分岐爪150の左側後端部を持ち上げて分岐爪150の下面と搬送ベルト112との間に隙間を形成することによって、用紙102の通過する搬送路102が形成される。分岐爪150の左側後端部を搬送ベルト112より下に位置させると、左から右に搬送される用紙102は、分岐爪150の左側後端面に突き当たったあと、吸着ベルト126によって引き上げられる。その後、ローラ123,125の回転方向を逆にすると、用紙102が下降し、用紙120が分岐爪150のところで再び左から右に搬送される。すなわち、垂直搬送手段120の右側に反転路122が形成されている。このように、分岐爪150の搖動方向と垂直搬送手段120の回転方向とを切換えることによって、用紙102の反転が行われている。
【0005】
また、特開昭56−122761号公報には、図2に示すような用紙反転機構が開示されている。図2に示した用紙反転機構では、水平搬送手段110の途中位置に、一対の垂直引上ローラ123,124と用紙退避手段128と分岐爪150とからなる垂直搬送手段120が配設されている。搬送ベルト112を挟んで、その上側に一対の垂直引上ローラ124及び用紙退避手段128が配置され、その下側に搖動軸152を中心に搖動可能な分岐爪150が配置されている。
【0006】
用紙102が左から右に搬送される際、分岐爪150が下がった退避状態であれば、垂直引上ローラ123と搬送ベルト112との間に搬送路102ができるので、用紙102は搬送路102を通過することができる。分岐爪150を搬送ベルト112より上に位置させると、左から右に搬送される用紙102が、分岐爪150に突き当たったあと、一対の垂直引上ローラ123,124に挟持されることによって用紙退避手段128に沿って引き上げられる。その後、ローラ123,124の回転方向を逆にすると、用紙102が用紙退避手段128に沿って下降したあと、搬送ベルト112に従って、用紙102が再び左から右に搬送される。すなわち、一対の垂直引上ローラ123,124から用紙退避手段128にかけて、反転路122が形成されている。このように、分岐爪150の搖動方向と一対の垂直引上ローラ123,124の回転方向とを切換えることによって、用紙102の表裏の反転が実現されている。
【0007】
しかしながら、図1及び2に示した従来の用紙反転機構では、いずれも、分岐爪150を搖動させるための複雑な搖動機構や搖動の切換えをタイミング良く行うための搖動制御装置を必要とし、それらの機構を設置するためのスペースも必要である。そして、ローラ123,124,125の正逆回転の切換えをタイミング良く行うための回転制御装置を必要とする。また、分岐爪150及びローラ123,124,125のそれぞれの切換えタイミングを調整する必要もある。
さらに、用紙102が反転路122を往復するための時間が必要である。したがって、従来の用紙反転機構は、用紙102を連続的に反転させることができないので、用紙102の高速反転が難しく、画像形成機の高速化を阻害する要因の一つとなっている。
【0008】
【発明が解決しようとする課題】
したがって、本発明の解決すべき技術的課題は、少数の構成部品であり且つ簡単な構造で構成され、用紙を高速且つ連続して反転させる用紙反転装置を提供することである。また、本発明の解決すべき技術的課題は、用紙を高速且つ連続的に反転させる用紙反転方法を提供することである。
【0009】
【課題を解決するための手段・作用・効果】
上記技術的課題を解決するために、本発明に係る用紙反転装置は、第一端部と該第一端部に対向する第二端部とを有する用紙を、第一端部を先頭にして第一搬送方向に搬送する第一搬送手段と、第一搬送手段の前方端に設けられて、前記第一端部を係止する係止手段と、第一搬送方向と交差する第二搬送方向に用紙を吸着搬送する第二搬送手段と、を備えることを特徴としている。
【0010】
上記構成によれば、孔版印刷機や複写機等の画像形成機において、第一端部と該第一端部に対向する第二端部とを有する用紙は、第一端部を先頭にして、第一搬送手段で第一搬送方向に搬送され、第一搬送手段の前方端に設けられた係止手段によって、用紙前方端である第一端部が係止される。そして、用紙の第一端部が係止手段で係止された状態で、用紙はさらに第一搬送方向に搬送され、用紙には、第一搬送方向と交差する第二搬送方向に湾曲した湾曲部が形成される。形成された湾曲部の第二端部側の後側面が第二搬送手段に吸着され、さらに、用紙は第一搬送手段と第二搬送手段とによって搬送され、湾曲部が第二搬送方向に移動する。その後、用紙の後方端である第二端部が第一搬送手段から離れ、第二搬送手段によって第二搬送方向に搬送される。そして、後方端である第二端部が第二搬送手段の終端部に達し、第二搬送手段に対する用紙の吸着面積がなくなり、湾曲部が消失する。用紙は、前方端である第一端部が係止手段で係止された状態で略平坦な状態になり、それまで第二搬送手段によって吸着されていた面の反対面が第二搬送手段に吸着されながら搬送される。その結果、用紙の表裏が反転するとともに、搬送方向における用紙の前方端と後方端とが反転する。
【0011】
したがって、第二搬送手段は、その回転方向を切換えることなく一方向にのみ回転させればよいので、用紙を高速且つ連続して反転させることができる。また、用紙反転装置は、従来のような分岐爪や分岐制御装置や第二搬送手段の回転方向を切換える回転制御装置等も不要であるので、構成部品が少なくてすみ、用紙反転装置の構造も簡単である。また、設置スペースが少なくてすみ、従来技術のような分岐爪の搖動やローラの正逆回転の切換え動作が不要であるので、用紙反転時に発生する騒音が低減されるという効果も得られる。
【0012】
また、本発明に係る用紙反転装置は、前記の構成において、第一搬送手段が、用紙を吸着搬送する吸着搬送手段からなり、前記第二搬送手段と一体構成されている用紙反転装置を含む。
【0013】
第一搬送手段が、用紙を吸着搬送する吸着搬送手段とされているとともに、第二搬送手段と一体化された構成であるので、構成部品もさらに少なくて済み、装置がさらに小型化される。また、用紙が吸着されながら搬送されるので、ローラによる搬送と比較して、用紙のインクが吸着搬送手段に付着することが少なくなる。
【0014】
さらにまた、本発明に係る用紙反転装置は、前記の構成において、第一搬送方向と第二搬送方向とが交差する角度が90度より小さく構成されている用紙反転装置を含む。
【0015】
用紙の第一端部が係止手段で係止された状態で湾曲部が形成されるが、第一搬送方向と第二搬送方向とが交差する角度が90度より小さく構成されているので、湾曲部の後側面が吸着搬送手段にスムーズに吸着される。用紙が吸着搬送手段でさらに搬送されることにより、湾曲部は第二搬送方向へと進み、高速で用紙反転を行うことができる。
【0016】
【発明の実施の形態】
以下に、本発明の第一実施形態に係る用紙反転装置1について、図3を参照しながら、詳細に説明する。
【0017】
図3は用紙反転装置1を側面から見た説明図である。図3に示すように、用紙反転装置1は、用紙2を第一搬送路12に沿って搬送する第一搬送手段10と、第一搬送手段10の前方端部に設けられた係止ストッパー18と、第一搬送手段10に対して大略垂直に配置された第二搬送手段20と、第二搬送手段20の上方端部に設けられた第三搬送手段30とを備えている。
【0018】
第一搬送手段10は、略水平に延在する案内板14と、案内板14の途中に設けられた切欠部から露出した紙送りローラ16とを備えている。用紙2は、上下一対の紙送りローラ16の間に挟持されながら、左から右に向かう略水平右方向の第一搬送方向Pに紙送りされる。
【0019】
案内板12の前方先端(図3では右端)には、用紙2の第一端部3を一時的に係止する係止ストッパー18が設けられている。係止ストッパー18は、斜め後方(紙送りローラ16の側)に向けて折り返された折り返し部と、案内板14より下側にわずかに窪んだ凹部19とを有する。
【0020】
第二搬送手段20が、第一搬送手段10の紙送りローラ16の略直上において、略垂直に隣接配置されている。第二搬送手段20は、第一ローラ23と、第二ローラ24と、第一ローラ23及び第二ローラ24の間に掛けられた無端の吸引搬送ベルト26と、無端の吸引搬送ベルト26で囲まれた空間内部をWの方向に排気する排気ファン28とを備えている。第一ローラ23及び第二ローラ24は、矢印で示した反時計回りに回転する。用紙2は、吸引搬送ベルト26の右側に形成された第二搬送路22の下から上に向かう略垂直上方向である第二搬送方向Pに紙送りされる。吸引搬送ベルト26には、多数の貫通した小孔が形成されており、小孔の周囲の空気がWの方向に小孔から吸い寄せられるので、用紙1が吸引搬送ベルト26に吸着される。この吸着力は、用紙1を吸引搬送ベルト26に対して吸着すること及び脱着することが可逆的になされ得る程度の弱い力である。
【0021】
第二搬送手段20の上方端部には、第三搬送手段30が隣接配置されている。
第三搬送手段30は、一対の上ローラが一対の下ローラに対して斜め上方に配置されているとともに、略扇形に湾曲して両ローラをつなぐ案内部材が配置された構成である。第二搬送手段20の上端から搬送された用紙2は、下ローラで挟持されたあと、斜め上方の上ローラに搬送される。すなわち、下方から供給された用紙2は、第三搬送手段30によって、第一搬送方向Pに対して略平行である略水平右方向に排出される。そのあと、用紙2は、その先に設けられた他の装置に搬送される。なお、用紙2は、必ずしも第三搬送手段30を介して他の装置に搬送される必要はなく、第二搬送手段20から直接に排紙受(不図示)に排出される場合もある。
【0022】
次に、図3を参照しながら、用紙2が反転される様子を説明する。
【0023】
まず、図3(A)に示すように、第一面2aが上面であり且つ第二面2bが下面である用紙2は、案内板14に沿って上下一対のローラ16の間に挟持されながら第一搬送方向P(左から右への略水平右方向)に紙送りされる。紙送りされた用紙2の前方端である第一端部3が、係止ストッパー18の凹部19に押し当てられて、第一端部3が凹部19で係止される。
【0024】
用紙2がさらに紙送りされると、用紙2の第一端部3が係止ストッパー18の凹部19で係止された状態で紙送りされるので、図3(B)に示すように、用紙2が第一面2aの側の方向に、すなわち上向きに湾曲して、湾曲部4を形成し始める。さらに紙送りされることにより、湾曲部4の後側面(図3(C)の紙面左側の面)が吸着搬送ベルト26に吸着され、湾曲部4は湾曲状態が保持されながら上向きの第二搬送方向Pに進み、図3(C)に示すように、用紙2の第一面2aが吸着搬送ベルト26に吸着される状態になる。
【0025】
用紙2は、上下一対のローラ16によって第一搬送方向Pにさらに搬送されるとともに、吸着された第一面2aが吸着搬送ベルト26によって第二搬送方向Pに搬送されて、湾曲部4は湾曲状態が保持されながら第二搬送方向Pに向けて第二搬送路22に沿って進む。用紙2の後方端である第二端部5が上下一対のローラ16から離れると、図3(D)に示すように、離れた第一面2aの第二端部5が吸着搬送ベルト26に吸着された状態で、第一面2aが吸着搬送ベルト26によって第二搬送方向Pに向けて第二搬送路22に沿って搬送される。なお、上下一対のローラ16から用紙2の第二端部5が離れて吸着搬送ベルト26に吸着された状態で、後続の用紙2が第一搬送路12に沿って搬送されることによって、上下一対のローラ16と係止ストッパー18との間で用紙2が部分的に重なるという状態が発生したとしても、用紙2を順次反転させることが可能である。
【0026】
第二端部5が第二搬送路22を進んでその終端部に達すると、吸着搬送ベルト26に吸着される用紙2の第一面2aの面積が小さくなり最終的に吸着面がなくなってしまい、湾曲状態が解消されて湾曲部4がなくなる。すなわち、用紙2の第二端部5が第二搬送路22の終端部に達することにより、係止ストッパー18の凹部19で係止された第一端部3と第二端部5との間における、湾曲部4の形成条件が解消されたので、湾曲部4が消失したのである。その結果、用紙2は元の略平坦な状態になり、図3(E)に示すように、用紙2の第二面2bが吸着搬送ベルト26側(図3の紙面左側)の方を向き、第一面2aが係止ストッパー18側(図3の紙面右側)の方を向き、用紙2の第二面2bが吸着搬送ベルト26に面状に吸着される。吸着搬送ベルト26によって面状に吸着される面が、第一面2aから第二面2bに変わるとともに、用紙2の後方端であった第二端部5が前方端に変わる。
【0027】
そのあと、図3(F)に示すように、用紙2は、吸着搬送ベルト26に吸着されながら、第二端部5を先頭にして第二搬送路22を搬送され、用紙2は第二端部5の方から第二搬送手段30の下ローラに挟持される。下ローラで挟持された用紙2は、案内部材に沿って斜め上方の上ローラに搬送される。その結果、下方から供給された用紙2は、第一面2aが下面であり且つ第二面2bが上面である状態で、第三搬送手段30によって、第一搬送方向Pと略平行な略水平右方向に排出される。したがって、用紙2が用紙反転装置1を通ることによって、用紙2の第一面2a及び第二面2bの上下(すなわち表裏)が反転する。
【0028】
上述した用紙反転装置1では、第二搬送手段20の回転方向を切換えることなく一方向にのみ回転させればよいので、用紙2を高速且つ連続して反転させることができる。また、用紙反転装置1では、従来のような分岐爪や分岐制御装置や第二搬送手段20の回転方向を切換える回転方向制御装置等も不要であるので、構成部品が少なくてすむ、用紙反転装置1の構造も簡単である、および用紙反転装置1の設置スペースが少なくてすむという効果が得られる。また、分岐爪の搖動やローラの正逆回転の切換え動作が不要であるので、用紙反転装置1から発生する騒音が低減されるという効果も得られる。
【0029】
次に、本発明の第二実施形態に係る用紙反転装置1について、図4を参照しながら、詳細に説明する。
【0030】
図4に示した用紙反転装置1では、図3の用紙反転装置1と比較して、用紙2を第一搬送方向Pに搬送する第一搬送手段10が、用紙2を第二搬送方向Pに搬送する第二搬送手段20に組み込まれて、両者が一体的に構成されている点が異なっており、その他の構成は図3の用紙反転装置1と大略同じである。
【0031】
すなわち、用紙反転装置1を側面から見た図4に示すように、第二搬送手段20において、第一ローラ23,第二ローラ24,第三ローラ25の三つのローラが、側面視、略直角三角形の各頂角部に配置され、無端の吸引搬送ベルト26が各ローラ23,24,25に掛けられているので、吸引搬送ベルト26が、側面視、略直角三角形を形成している。第一ローラ23と第三ローラ25とを結ぶ面は略水平であり、第一ローラ23と第二ローラ24とを結ぶ面は略垂直である。
【0032】
略水平に延在する第一搬送路12は、第一ローラ23と第三ローラ25とを結ぶ吸引搬送ベルト26と、吸引搬送ベルト26の下方に配設されて略水平に延在する案内板14との隙間から形成されている。第一搬送方向Pは、左から右に向かう略水平右方向である。また、略垂直に延在する第二搬送路22は、第一ローラ23と第二ローラ24とを結ぶ吸引搬送ベルト26の右側に形成されている。第二搬送方向Pが下から上に向かう略垂直上方向である。
【0033】
第二搬送手段20は、第一ローラ23,第二ローラ24,第三ローラ25の三つのローラ間に掛けられた無端の吸引搬送ベルト26で囲まれた空間内部をWの方向に排気する排気ファン28を備えている。吸引搬送ベルト26には、多数の貫通した小孔が形成されており、小孔の周囲の空気がWの方向に小孔から吸い寄せられるので、用紙1が吸引搬送ベルト26に吸着される。この吸着力は、用紙1を吸引搬送ベルト26に対して吸着すること及び脱着することが可逆的になされる程度の弱い力である。
【0034】
第一ローラ23,第二ローラ24,第三ローラ25は、矢印で示した反時計回りに回転する。用紙2は、第二搬送手段20の下側に形成された第一搬送路12に沿って、略水平右方向である第一搬送方向Pに搬送される。また、用紙2は、第二搬送手段20の右側に形成された第二搬送路22に沿って、略垂直上方向である第二搬送方向Pに搬送される。なお、第二実施形態に係る用紙反転装置1では、用紙2の搬送が全て吸着によって行われている。したがって、用紙1は、吸引搬送ベルト26によって弱い吸着力で吸着されながら搬送されているので、ローラによる搬送に比べて、用紙2のインクが吸引搬送ベルト26に付着することが少なくなるという利点がある。
【0035】
案内板12の前方先端(図4では右端)には、係止手段としての係止ストッパー18が設けられている。係止ストッパー18は、斜め後方に向けて折り返された折り返し部と、案内板14より下側にわずかに窪んだ凹部19とを有する。
【0036】
図4を参照しながら、用紙2が反転される様子を説明する。
【0037】
まず、図4(A)に示すように、第一面2aが上面であり且つ第二面2bが下面である用紙2は、案内板14に沿って吸着搬送ベルト26に吸着されながら、第一搬送方向P(略水平右方向)に紙送りされる。紙送りされた用紙2の前方端である第一端部3が、係止ストッパー18の凹部19に押し当てられて、第一端部3が凹部19で係止される。
【0038】
用紙2がさらに紙送りされると、用紙2の第一端部3が係止ストッパー18の凹部19で係止された状態で紙送りされるので、図4(B)に示すように、用紙2の第一面2a側に、すなわち上向きに湾曲して、湾曲部4を形成し始める。さらに紙送りされることにより、湾曲部4の後側面(図4(B)の紙面左側の面)が第二搬送手段20の吸着搬送ベルト26に吸着される状態となり、さらに湾曲状態が保持されながら、湾曲部4は略垂直上方向の第二搬送方向Pに向けて進み、図4(C)に示すように、用紙2の第一面2aが吸引搬送ベルト26に吸着される状態となる。
【0039】
用紙2は、第一搬送手段10としての吸着搬送ベルト26に吸着されながら、第一搬送方向Pへ搬送されるとともに、吸着された第一面2aが第二搬送手段20としての吸着搬送ベルト26によって第二搬送方向Pに搬送され、湾曲部4は、湾曲状態が保持されながら第二搬送方向Pに向けて第二搬送路22を進む。用紙2の後方端である第二端部5が第一搬送方向Pへの紙送りから離れると、図4(D)に示すように、離れた第一面2aの第二端部5が吸引搬送ベルト26に吸着された状態で、第二端部5は吸引搬送ベルト26によって第二搬送方向Pに向けて第二搬送路22に沿って搬送される。
【0040】
第二端部5が第二搬送路22を進んでその終端部に達すると、第一実施形態での反転動作と同様に、吸引搬送ベルト26に吸着される用紙2の第一面2aの面積が小さくなり、最終的には吸着面がなくなってしまい、湾曲状態が解消されて湾曲部4が消失する。その結果、用紙2は元の略平坦な状態となり、用紙2の第二面2bが吸着搬送ベルト26側(図4の紙面左側)の方を向き、第一面2aが係止ストッパー18側(図3の紙面右側)の方を向き、用紙2の第二面2bが吸着搬送ベルト26に面状に吸着される。吸着搬送ベルト26によって面状に吸着される面が、第一面2aから第二面2bに変わるとともに、用紙2の後方端であった第二端部5が前方端に変わる。
【0041】
そのあと、用紙2は、吸着搬送ベルト26に吸着されながら、第二端部5を先頭にして第二搬送路22を搬送され、用紙2の第二端部5が第三搬送手段30の下ローラに挟持される。下ローラで挟持された用紙2は、案内部材に沿って斜め上方の上ローラに搬送される。その結果、下方から供給された用紙2は、第一面2aが下面であり且つ第二面2bが上面である状態で、第三搬送手段30によって、第一搬送方向Pと略平行な略水平右方向に排出される。したがって、用紙2が用紙反転装置1を通ることによって、用紙2の第一面2a及び第二面2bの上下(すなわち裏表)が反転する。
【0042】
第二実施形態に係る用紙反転装置1では、上述した第一実施形態と同様に、用紙2の高速且つ連続的な反転、部品点数の削減、構造の簡略化、省設置スペース、低騒音化が達成されている。
【0043】
本発明の第三実施形態に係る用紙反転装置1について、図5を参照しながら説明する。
【0044】
図5に示した用紙反転装置1では、図3の用紙反転装置1と比較して、第一搬送手段10によって用紙2を略水平右方向に搬送する第一搬送方向Pと、第二搬送手段20によって用紙2を搬送する第二搬送方向Pとが交差する角度θが90度より小さくなるように構成されている点が異なっており、その他の構成は図3の用紙反転装置1と大略同じである。
【0045】
すなわち、図5に示すように、第二搬送手段20は、第一搬送手段10に対して第一実施形態の大略垂直である状態から、前方に位置する係止ストッパー18の側に少し傾斜した状態で配置されている。したがって、第一搬送方向Pと第二搬送方向Pとが交差する角度θが90度より小さくなっている。
【0046】
この構成においては、用紙2の第一端部3が係止ストッパー18の凹部19で係止された状態で湾曲部4が形成されるが、第一搬送方向Pと第二搬送方向Pとが交差する角度が90度より小さく構成されているので、図5(B)に示すように、湾曲部4の後側面(図5の紙面左側の面)が吸着搬送ベルト26にスムーズに吸着される。さらに、吸着搬送ベルト26の搬送により、図5の(C)及び(D)に示すように、湾曲部4は上向きの第二搬送方向Pへと進み、高速で用紙反転を行うことができる。
【0047】
本発明の第四実施形態に係る用紙反転装置1について、図6を参照しながら説明する。
【0048】
図6に示した用紙反転装置1では、図4の用紙反転装置1と比較して、第二搬送手段20によって用紙2を略水平右方向に搬送する第一搬送方向Pと、第二搬送手段20によって用紙2を搬送する第二搬送方向Pとが交差する角度θが90度より小さくなるように構成されている点が異なっており、その他の構成は図4の用紙反転装置1と大略同じである。
【0049】
すなわち、図6に示すように、第二搬送手段20において、第二ローラ24の位置が、第二実施形態における位置に対して、第一搬送方向Pの前方に位置する係止ストッパー18の側にずれた位置に配置され、第二搬送手段20の吸引搬送ベルト26が傾斜した状態とされている。したがって、第一搬送方向Pと第二搬送方向Pとが交差する角度θが90度より小さくなっている。
【0050】
この構成においては、用紙2の第一端部3が係止ストッパー18の凹部19で係止された状態で湾曲部4が形成されるが、第一搬送方向Pと第二搬送方向Pとが交差する角度θが90度より小さく構成されているので、図6(B)に示すように、湾曲部4の後側面(図6の紙面左側)が第二搬送手段20の吸着搬送ベルト26にスムーズに吸着される。さらに、吸着搬送ベルト26の搬送により、図6の(C)及び(D)に示すように、湾曲部4は上向きの第二搬送方向Pへと進み、高速で用紙反転を行うことができる。
【図面の簡単な説明】
【図1】従来の用紙反転装置を示す説明図である。
【図2】従来の他の用紙反転装置を示す説明図である。
【図3】本発明の第一実施形態に係る用紙反転装置における用紙反転方法を説明する図である。
【図4】本発明の第二実施形態に係る用紙反転装置における用紙反転方法を説明する図である。
【図5】本発明の第三実施形態に係る用紙反転装置における用紙反転方法を説明する図である。
【図6】本発明の第四実施形態に係る用紙反転装置における用紙反転方法を説明する図である。
【符号の説明】
1 用紙反転装置
2 用紙
2a 第一面
2b 第二面
3 第一端部
4 湾曲部
5 第二端部
10 第一搬送手段
12 第一搬送路
14 案内板
16 紙送りローラ
18 係止ストッパー
19 凹部
20 第二搬送手段
22 第二搬送路
23 第一ローラ
24 第二ローラ
25 第三ローラ
26 吸着搬送ベルト
28 排気ファン
30 第三搬送手段
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sheet reversing device and a sheet reversing method in an image forming machine such as a stencil printing machine or a copying machine.
[0002]
[Prior art]
In an image forming machine, a sheet on which an image has been transferred is normally discharged with the image transfer surface facing upward, but may be discharged with the sheet turned upside down for collation. Further, in order to transfer an image to both sides (front and back) of a sheet, the image is transferred to one side (front side), and then the sheet is reversed and the image is transferred to the other side (back side).
[0003]
For example, JP-A-56-122761 discloses a sheet reversing mechanism as shown in FIG. In the paper reversing mechanism shown in FIG. 1, a vertical transport unit 120 is provided at an intermediate position of the horizontal transport unit 110. Near the front side of the vertical transport means 120, a roughly triangular branch claw 150 is provided so as to be swingable about a swing shaft 152.
[0004]
In FIG. 1, when the sheet 102 is conveyed from left to right, the left rear end of the branch claw 150 is lifted to form a gap between the lower surface of the branch claw 150 and the transport belt 112, so that the sheet 102 A transport path 102 that passes is formed. When the left rear end portion of the branch claw 150 is positioned below the transport belt 112, the sheet 102 conveyed from left to right hits the left rear end surface of the branch claw 150 and is pulled up by the suction belt 126. Thereafter, when the rotation directions of the rollers 123 and 125 are reversed, the sheet 102 descends, and the sheet 120 is conveyed again from left to right at the branching claw 150. That is, the reversing path 122 is formed on the right side of the vertical transport means 120. As described above, by switching between the swing direction of the branch claw 150 and the rotation direction of the vertical transport unit 120, the sheet 102 is inverted.
[0005]
Japanese Patent Application Laid-Open No. 56-122761 discloses a sheet reversing mechanism as shown in FIG. In the sheet reversing mechanism shown in FIG. 2, a vertical conveying unit 120 including a pair of vertical pull-up rollers 123 and 124, a sheet retracting unit 128, and a branch claw 150 is provided at an intermediate position of the horizontal conveying unit 110. . A pair of vertical pull-up rollers 124 and a sheet retracting unit 128 are disposed above the transport belt 112 and a branch claw 150 that can swing around a swing shaft 152 is disposed below the pair of vertical pull-up rollers 124 and the sheet retracting unit 128.
[0006]
When the paper 102 is conveyed from left to right, if the branch claw 150 is in the retracted state, the conveyance path 102 is formed between the vertical pull-up roller 123 and the conveyance belt 112. Can pass through. When the branching claw 150 is positioned above the conveyor belt 112, the sheet 102 conveyed from left to right hits the branching claw 150 and is then retracted by being nipped between the pair of vertical pull-up rollers 123 and 124. It is raised along the means 128. Thereafter, when the rotation direction of the rollers 123 and 124 is reversed, the sheet 102 descends along the sheet retracting means 128, and the sheet 102 is conveyed again from left to right according to the conveying belt 112. That is, a reversing path 122 is formed from the pair of vertical pulling rollers 123 and 124 to the sheet retracting means 128. In this way, by switching the swinging direction of the branch claw 150 and the rotating direction of the pair of vertical pull-up rollers 123 and 124, the upside down of the sheet 102 is realized.
[0007]
However, the conventional paper reversing mechanisms shown in FIGS. 1 and 2 both require a complicated rocking mechanism for rocking the branch claw 150 and a rocking control device for switching the rocking with good timing. Space for installing the mechanism is also required. In addition, a rotation control device for switching the forward / backward rotation of the rollers 123, 124, 125 with good timing is required. Further, it is necessary to adjust the switching timing of each of the branch claw 150 and the rollers 123, 124, 125.
Further, it takes time for the paper 102 to reciprocate on the reversing path 122. Therefore, since the conventional paper reversing mechanism cannot continuously reverse the paper 102, it is difficult to invert the paper 102 at high speed, which is one of the factors that hinder the speeding up of the image forming machine.
[0008]
[Problems to be solved by the invention]
Therefore, a technical problem to be solved by the present invention is to provide a sheet reversing device that has a small number of components and has a simple structure, and that reverses a sheet continuously at high speed. A technical problem to be solved by the present invention is to provide a sheet reversing method for reversing a sheet continuously at high speed.
[0009]
[Means, actions and effects to solve the problem]
In order to solve the above technical problem, a sheet reversing device according to the present invention provides a sheet having a first end portion and a second end portion facing the first end portion, with the first end portion leading. A first transport unit that transports in the first transport direction, a locking unit that is provided at a front end of the first transport unit and locks the first end, and a second transport direction that intersects the first transport direction. And a second conveying means for adsorbing and conveying the sheet.
[0010]
According to the above configuration, in an image forming machine such as a stencil printing machine or a copying machine, a sheet having a first end and a second end opposite to the first end has the first end at the top. The sheet is conveyed in the first conveying direction by the first conveying means, and the first end, which is the front end of the sheet, is locked by the locking means provided at the front end of the first conveying means. Then, in a state where the first end of the sheet is locked by the locking means, the sheet is further transported in the first transport direction, and the sheet has a curved shape that is curved in the second transport direction intersecting the first transport direction. A part is formed. The rear side surface of the formed curved portion on the second end side is sucked by the second transporting device, and the sheet is transported by the first transporting device and the second transporting device, and the curved portion moves in the second transporting direction. I do. Then, the second end, which is the rear end of the sheet, is separated from the first conveying means, and is conveyed in the second conveying direction by the second conveying means. Then, the second end, which is the rear end, reaches the terminal end of the second conveying means, the area for adsorbing the sheet to the second conveying means disappears, and the curved portion disappears. The sheet is substantially flat with the first end, which is the front end, locked by the locking means, and the surface opposite to the surface that has been sucked by the second transport means until then is transferred to the second transport means. It is transported while being sucked. As a result, the front and back of the sheet are reversed, and the front end and the rear end of the sheet in the transport direction are reversed.
[0011]
Therefore, since the second transport means only needs to rotate in one direction without switching its rotation direction, the paper can be reversed at high speed and continuously. Further, since the sheet reversing device does not require a branching claw, a branching control device, or a rotation control device for switching the rotation direction of the second conveying means as in the related art, the number of components is reduced, and the structure of the sheet reversing device is also reduced. Easy. In addition, the installation space can be reduced, and the swinging of the branch claws and the switching operation of the forward / reverse rotation of the roller as in the related art are not required. Therefore, the effect of reducing the noise generated at the time of sheet reversal can be obtained.
[0012]
Further, in the sheet reversing device according to the present invention, in the above-described configuration, the first transporting unit includes a sheet reversing device integrally formed with the second transporting unit, the first transporting unit being a suction transporting unit for sucking and transporting the sheet.
[0013]
Since the first transporting means is a suction transporting means for sucking and transporting the paper, and has a configuration integrated with the second transporting means, the number of components is further reduced, and the apparatus is further downsized. Further, since the sheet is conveyed while being suctioned, the ink of the sheet is less likely to adhere to the suction conveyance unit as compared with the conveyance by the roller.
[0014]
Furthermore, the sheet reversing device according to the present invention includes the sheet reversing device in the above-described configuration, wherein an angle at which the first transport direction and the second transport direction intersect is smaller than 90 degrees.
[0015]
The curved portion is formed in a state where the first end portion of the paper is locked by the locking means, but since the angle at which the first transport direction and the second transport direction intersect is smaller than 90 degrees, The rear side surface of the curved portion is smoothly sucked by the suction conveyance means. When the sheet is further transported by the suction transport unit, the curved portion advances in the second transport direction, and the sheet can be reversed at a high speed.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the sheet reversing device 1 according to the first embodiment of the present invention will be described in detail with reference to FIG.
[0017]
FIG. 3 is an explanatory view of the sheet reversing device 1 as viewed from the side. As shown in FIG. 3, the sheet reversing device 1 includes a first conveying unit 10 that conveys the sheet 2 along the first conveying path 12, and a locking stopper 18 provided at a front end of the first conveying unit 10. A second transporting means 20 disposed substantially perpendicular to the first transporting means 10; and a third transporting means 30 provided at an upper end of the second transporting means 20.
[0018]
The first transport unit 10 includes a guide plate 14 extending substantially horizontally, and a paper feed roller 16 exposed from a cutout provided in the middle of the guide plate 14. The paper 2 is sandwiched between a pair of upper and lower paper feed rollers 16, and is substantially horizontally rightward in the first transport direction P from left to right. 1 Paper is sent to
[0019]
At the front end (right end in FIG. 3) of the guide plate 12, a locking stopper 18 for temporarily locking the first end 3 of the sheet 2 is provided. The locking stopper 18 has a folded portion that is folded obliquely rearward (toward the paper feed roller 16) and a concave portion 19 that is slightly recessed below the guide plate 14.
[0020]
The second transport means 20 is disposed substantially immediately above the paper feed roller 16 of the first transport means 10 and substantially vertically adjacent thereto. The second transport means 20 is surrounded by a first roller 23, a second roller 24, an endless suction transport belt 26 hung between the first roller 23 and the second roller 24, and an endless suction transport belt 26. And an exhaust fan 28 for exhausting the interior of the space in the W direction. The first roller 23 and the second roller 24 rotate counterclockwise as indicated by arrows. The paper 2 is transported in a second transport direction P, which is a substantially vertical upward direction from below to above the second transport path 22 formed on the right side of the suction transport belt 26. 2 Paper is sent to A large number of small holes are formed in the suction conveyance belt 26, and the air around the small holes is drawn from the small holes in the direction of W, so that the sheet 1 is adsorbed to the suction conveyance belt 26. The suction force is a weak force that can reversibly adsorb and detach the sheet 1 to and from the suction conveyance belt 26.
[0021]
At the upper end of the second transport means 20, a third transport means 30 is arranged adjacently.
The third transporting means 30 has a configuration in which a pair of upper rollers are disposed obliquely above the pair of lower rollers, and a guide member that is curved substantially in a fan shape and connects the two rollers is disposed. The sheet 2 conveyed from the upper end of the second conveying means 20 is conveyed to the upper roller obliquely upward after being nipped by the lower roller. That is, the sheet 2 supplied from below is transported by the third transport unit 30 in the first transport direction P. 1 Is discharged in a substantially horizontal right direction that is substantially parallel to After that, the paper 2 is transported to another device provided ahead. Note that the sheet 2 does not necessarily need to be transported to another device via the third transport unit 30, and may be directly discharged from the second transport unit 20 to a paper receiving tray (not shown).
[0022]
Next, how the sheet 2 is reversed will be described with reference to FIG.
[0023]
First, as shown in FIG. 3A, the paper 2 having the first surface 2 a as the upper surface and the second surface 2 b as the lower surface is sandwiched between the pair of upper and lower rollers 16 along the guide plate 14. First transport direction P 1 (Substantially horizontally rightward from left to right). The first end 3, which is the front end of the fed sheet 2, is pressed against the recess 19 of the locking stopper 18, and the first end 3 is locked by the recess 19.
[0024]
When the paper 2 is further fed, the paper 2 is fed in a state where the first end 3 of the paper 2 is locked by the concave portion 19 of the locking stopper 18, so that the paper 2 is fed as shown in FIG. 2 is curved in the direction of the first surface 2 a, that is, upward, and starts to form the curved portion 4. When the paper is further fed, the rear side surface of the curved portion 4 (the left side surface in FIG. 3C) is attracted to the suction / transport belt 26, and the curved portion 4 is maintained in the curved state while the upward second transport is performed. Direction P 2 Then, as shown in FIG. 3 (C), the first surface 2a of the sheet 2 is in a state of being sucked by the suction conveyance belt 26.
[0025]
The sheet 2 is transported by the pair of upper and lower rollers 16 in the first transport direction P. 1 Is further conveyed, and the suctioned first surface 2a is moved by the suction conveyance belt 26 in the second conveyance direction P. 2 Is transported to the second transport direction P while the bending portion 4 maintains the curved state. 2 Along the second transport path 22. When the second end 5 which is the rear end of the sheet 2 is separated from the pair of upper and lower rollers 16, the separated second end 5 of the first surface 2 a is attached to the suction conveyance belt 26 as shown in FIG. In the suction state, the first surface 2a is moved by the suction conveyance belt 26 in the second conveyance direction P. 2 Along the second transport path 22. The following sheet 2 is conveyed along the first conveyance path 12 in a state where the second end portion 5 of the sheet 2 is separated from the pair of upper and lower rollers 16 and is adsorbed on the adsorption conveyance belt 26, so that the sheet 2 is moved up and down. Even if the sheet 2 partially overlaps between the pair of rollers 16 and the locking stopper 18, the sheet 2 can be sequentially reversed.
[0026]
When the second end 5 advances along the second conveyance path 22 and reaches the end thereof, the area of the first surface 2a of the sheet 2 adsorbed on the adsorption conveyance belt 26 becomes small, and the adsorption surface eventually disappears. The bending state is eliminated, and the bending portion 4 disappears. That is, when the second end 5 of the paper 2 reaches the end of the second transport path 22, the gap between the first end 3 and the second end 5 locked by the concave portion 19 of the locking stopper 18 is formed. Since the conditions for forming the curved portion 4 in the above were eliminated, the curved portion 4 disappeared. As a result, the sheet 2 returns to the original substantially flat state, and as shown in FIG. 3E, the second surface 2b of the sheet 2 faces the suction conveyance belt 26 side (the left side in FIG. 3). The first surface 2a faces the locking stopper 18 side (the right side of the paper surface in FIG. 3), and the second surface 2b of the paper 2 is sucked by the suction conveyance belt 26 in a planar manner. The surface sucked by the suction conveyance belt 26 in a planar manner changes from the first surface 2a to the second surface 2b, and the second end portion 5, which is the rear end of the sheet 2, changes to the front end.
[0027]
Thereafter, as shown in FIG. 3F, the sheet 2 is conveyed on the second conveyance path 22 with the second end 5 at the top while being adsorbed on the adsorption conveyance belt 26, and the sheet 2 is From the part 5, the second conveying means 30 is nipped by the lower roller. The sheet 2 nipped by the lower roller is conveyed to the upper roller obliquely upward along the guide member. As a result, the sheet 2 supplied from below is moved by the third conveying means 30 in the first conveying direction P with the first surface 2a being the lower surface and the second surface 2b being the upper surface. 1 And discharged in a substantially horizontal right direction substantially parallel to Therefore, when the sheet 2 passes through the sheet reversing device 1, the first surface 2 a and the second surface 2 b of the sheet 2 are turned upside down (ie, front and back).
[0028]
In the above-described sheet reversing device 1, since the rotation of the second conveying means 20 need only be rotated in one direction without switching, the sheet 2 can be reversed continuously at high speed. In addition, the sheet reversing device 1 does not require a conventional branching claw, a branch control device, a rotation direction control device for switching the rotation direction of the second conveying means 20, and the like. 1 is simple, and the space required for installing the sheet reversing device 1 is small. Further, since the swinging of the branch claws and the switching operation between the forward and reverse rotations of the rollers are unnecessary, the effect of reducing the noise generated from the sheet reversing device 1 can be obtained.
[0029]
Next, a paper reversing device 1 according to a second embodiment of the present invention will be described in detail with reference to FIG.
[0030]
In the sheet reversing device 1 shown in FIG. 4, compared with the sheet reversing device 1 in FIG. 1 Transport means 10 transports the paper 2 in the second transport direction P 2 The second embodiment is different from the first embodiment in that both are integrated into a second transporting means 20 and the two are integrally configured, and the other configuration is substantially the same as that of the sheet reversing device 1 in FIG.
[0031]
That is, as shown in FIG. 4 when the sheet reversing device 1 is viewed from the side, in the second conveying means 20, the three rollers of the first roller 23, the second roller 24, and the third roller 25 are substantially perpendicular to each other when viewed from the side. Since the endless suction conveyance belt 26 is disposed at each apex of the triangle and is hung on each of the rollers 23, 24, 25, the suction conveyance belt 26 forms a substantially right-angled triangle in side view. The surface connecting the first roller 23 and the third roller 25 is substantially horizontal, and the surface connecting the first roller 23 and the second roller 24 is substantially vertical.
[0032]
The first conveyance path 12 extending substantially horizontally includes a suction conveyance belt 26 connecting the first roller 23 and the third roller 25, and a guide plate disposed below the suction conveyance belt 26 and extending substantially horizontally. 14 is formed. First transport direction P 1 Is a substantially horizontal right direction from left to right. The second conveyance path 22 that extends substantially vertically is formed on the right side of the suction conveyance belt 26 that connects the first roller 23 and the second roller 24. Second transport direction P 2 Is a substantially vertical upward direction from bottom to top.
[0033]
The second conveying means 20 exhausts air in the direction W in the space surrounded by the endless suction conveying belt 26 hung between the three rollers of the first roller 23, the second roller 24, and the third roller 25. A fan 28 is provided. A large number of small holes are formed in the suction conveyance belt 26, and the air around the small holes is drawn from the small holes in the direction of W, so that the sheet 1 is adsorbed to the suction conveyance belt 26. The attraction force is a weak force at which the suction and detachment of the sheet 1 with respect to the suction conveyance belt 26 are reversibly performed.
[0034]
The first roller 23, the second roller 24, and the third roller 25 rotate counterclockwise as indicated by arrows. The paper 2 is moved along the first transport path 12 formed below the second transport means 20 in the first transport direction P, which is a substantially horizontal right direction. 1 Transported to Further, the paper 2 is moved along a second transport path 22 formed on the right side of the second transport means 20 in a second transport direction P which is a substantially vertical upward direction. 2 Transported to In the sheet reversing device 1 according to the second embodiment, the conveyance of the sheet 2 is entirely performed by suction. Therefore, since the sheet 1 is conveyed while being sucked by the suction conveyance belt 26 with a weak suction force, there is an advantage that the ink of the sheet 2 is less likely to adhere to the suction conveyance belt 26 as compared with conveyance by the rollers. is there.
[0035]
At the front end (right end in FIG. 4) of the guide plate 12, a locking stopper 18 as locking means is provided. The locking stopper 18 has a folded portion that is folded obliquely rearward and a concave portion 19 that is slightly recessed below the guide plate 14.
[0036]
The manner in which the sheet 2 is reversed will be described with reference to FIG.
[0037]
First, as shown in FIG. 4 (A), the paper 2 having the first surface 2a as the upper surface and the second surface 2b as the lower surface, while being sucked by the suction conveyance belt 26 along the guide plate 14, Transport direction P 1 (Substantially horizontally right). The first end 3, which is the front end of the fed sheet 2, is pressed against the recess 19 of the locking stopper 18, and the first end 3 is locked by the recess 19.
[0038]
When the sheet 2 is further fed, the sheet is fed in a state where the first end 3 of the sheet 2 is locked by the concave portion 19 of the locking stopper 18, so that the sheet 2 is fed as shown in FIG. 2, that is, bent upward, that is, to form the curved portion 4. By further feeding the paper, the rear side surface of the curved portion 4 (the surface on the left side of the paper surface in FIG. 4B) is brought into a state where it is sucked by the suction conveyance belt 26 of the second conveyance means 20, and the curved state is maintained. While the bending portion 4 is substantially vertically upward in the second transport direction P 2 Then, as shown in FIG. 4C, the first surface 2 a of the sheet 2 is attracted to the suction conveyance belt 26.
[0039]
The sheet 2 is adsorbed by the adsorption conveyance belt 26 as the first conveyance means 10 while the first conveyance direction P 1 Is transported to the second transport direction P by the suction transport belt 26 as the second transport means 20 2 In the second transport direction P while maintaining the curved state. 2 To the second transport path 22 toward. The second end 5 which is the rear end of the sheet 2 is in the first transport direction P 1 4D, the second end 5 of the first surface 2a is suction-conveyed while the second end 5 of the separated first surface 2a is attracted to the suction conveyance belt 26, as shown in FIG. The second transport direction P by the belt 26 2 Along the second transport path 22.
[0040]
When the second end portion 5 advances along the second conveyance path 22 and reaches the end portion, the area of the first surface 2a of the sheet 2 adsorbed on the suction conveyance belt 26 is similar to the reversing operation in the first embodiment. Becomes smaller, and finally the suction surface disappears, the bending state is eliminated, and the bending portion 4 disappears. As a result, the paper 2 returns to the original substantially flat state, the second surface 2b of the paper 2 faces the suction conveyance belt 26 side (the left side of the paper surface in FIG. 4), and the first surface 2a faces the locking stopper 18 ( The second surface 2b of the sheet 2 is sucked by the suction conveyance belt 26 in a planar manner, facing the right side of FIG. The surface sucked by the suction conveyance belt 26 in a planar manner changes from the first surface 2a to the second surface 2b, and the second end portion 5, which is the rear end of the sheet 2, changes to the front end.
[0041]
Thereafter, the sheet 2 is conveyed through the second conveyance path 22 with the second end 5 at the top while being adsorbed by the adsorption conveyance belt 26, and the second end 5 of the sheet 2 is moved below the third conveyance unit 30. It is pinched by rollers. The sheet 2 nipped by the lower roller is conveyed to the upper roller obliquely upward along the guide member. As a result, the sheet 2 supplied from below is moved by the third conveying means 30 in the first conveying direction P with the first surface 2a being the lower surface and the second surface 2b being the upper surface. 1 And discharged in a substantially horizontal right direction substantially parallel to Therefore, when the sheet 2 passes through the sheet reversing device 1, the first surface 2 a and the second surface 2 b of the sheet 2 are turned upside down (that is, upside down).
[0042]
In the sheet reversing device 1 according to the second embodiment, as in the first embodiment described above, high-speed and continuous reversal of the sheet 2, reduction in the number of parts, simplification of the structure, installation space, and noise reduction are achieved. Has been achieved.
[0043]
A paper reversing device 1 according to a third embodiment of the present invention will be described with reference to FIG.
[0044]
In the sheet reversing device 1 shown in FIG. 5, the first reversing device 1 in FIG. 1 And the second transport direction P in which the paper 2 is transported by the second transport unit 20 2 3 is smaller than 90 degrees, and the other configuration is substantially the same as the sheet reversing device 1 of FIG.
[0045]
That is, as shown in FIG. 5, the second transporting means 20 is slightly inclined from the substantially vertical state of the first embodiment to the first transporting means 10 toward the locking stopper 18 located forward. It is arranged in a state. Therefore, the first transport direction P 1 And the second transport direction P 2 Is smaller than 90 degrees.
[0046]
In this configuration, the curved portion 4 is formed in a state where the first end portion 3 of the sheet 2 is locked by the concave portion 19 of the locking stopper 18, but the first transport direction P 1 And the second transport direction P 2 Is smaller than 90 degrees, so that the rear side surface (the left side surface in FIG. 5) of the curved portion 4 is smoothly sucked to the suction conveyance belt 26 as shown in FIG. 5B. Is done. Further, due to the conveyance of the suction conveyance belt 26, the curved portion 4 is moved upward in the second conveyance direction P as shown in FIGS. 2 Then, the sheet can be reversed at a high speed.
[0047]
A paper reversing device 1 according to a fourth embodiment of the present invention will be described with reference to FIG.
[0048]
The sheet reversing device 1 shown in FIG. 6 is different from the sheet reversing device 1 in FIG. 4 in that the second conveying means 20 conveys the sheet 2 in a substantially horizontal right direction. 1 And the second transport direction P in which the paper 2 is transported by the second transport unit 20 2 Is different from that of the sheet reversing device 1 shown in FIG. 4 in that the angle .theta.
[0049]
That is, as shown in FIG. 6, in the second transporting means 20, the position of the second roller 24 is shifted with respect to the position in the second embodiment in the first transport direction P 1 , The suction conveyance belt 26 of the second conveyance means 20 is inclined. Therefore, the first transport direction P 1 And the second transport direction P 2 Is smaller than 90 degrees.
[0050]
In this configuration, the curved portion 4 is formed in a state where the first end portion 3 of the sheet 2 is locked by the concave portion 19 of the locking stopper 18, but the first transport direction P 1 And the second transport direction P 2 6B is smaller than 90 degrees, the rear side surface (left side in FIG. 6) of the curved portion 4 is attached to the suction conveyance belt of the second conveyance means 20 as shown in FIG. 26 is smoothly absorbed. Further, due to the conveyance of the suction conveyance belt 26, the curved portion 4 is moved upward in the second conveyance direction P as shown in FIGS. 2 Then, the sheet can be reversed at a high speed.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a conventional sheet reversing device.
FIG. 2 is an explanatory view showing another conventional sheet reversing device.
FIG. 3 is a diagram illustrating a sheet reversing method in the sheet reversing device according to the first embodiment of the present invention.
FIG. 4 is a diagram illustrating a sheet reversing method in a sheet reversing device according to a second embodiment of the present invention.
FIG. 5 is a diagram illustrating a sheet reversing method in a sheet reversing device according to a third embodiment of the present invention.
FIG. 6 is a diagram illustrating a sheet reversing method in a sheet reversing device according to a fourth embodiment of the present invention.
[Explanation of symbols]
1 Paper reversing device
2 paper
2a Front side
2b Second surface
3 First end
4 curved part
5 Second end
10 First transport means
12 First transport path
14 Information board
16 Paper feed roller
18 Locking stopper
19 recess
20 Second transport means
22 Second transport path
23 First Roller
24 Second Roller
25 Third roller
26 Suction conveyance belt
28 Exhaust fan
30 Third transport means

Claims (4)

第一端部と該第一端部に対向する第二端部とを有する用紙を、第一端部を先頭にして第一搬送方向に搬送する第一搬送手段と、
第一搬送手段の前方端に設けられて、前記第一端部を係止する係止手段と、
第一搬送方向と交差する第二搬送方向に用紙を吸着搬送する第二搬送手段と、を備えることを特徴とする用紙反転装置。
A sheet having a first end and a second end opposite to the first end, a first conveying unit that conveys the sheet in the first conveying direction with the first end being the leading end,
Locking means provided at the front end of the first transport means to lock the first end,
A sheet reversing device, comprising: a second conveying unit that adsorbs and conveys a sheet in a second conveying direction that intersects the first conveying direction.
前記第一搬送手段は、用紙を吸着搬送する吸着搬送手段からなり、前記第二搬送手段と一体構成されていることを特徴とする、請求項1記載の用紙反転装置。2. The sheet reversing device according to claim 1, wherein the first transport unit includes a suction transport unit that sucks and transports the sheet, and is integrated with the second transport unit. 3. 前記第一搬送方向と第二搬送方向とが交差する角度が、90度より小さいことを特徴とする、請求項1又は2記載の用紙反転装置。3. The sheet reversing device according to claim 1, wherein an angle at which the first transport direction and the second transport direction intersect is smaller than 90 degrees. 第一端部と該第一端部に対向する第二端部とを有する用紙を、第一端部を先頭にして第一搬送方向に搬送し、
前記用紙の第一端部を係止するとともに、さらに前記用紙を第一搬送方向に搬送し、
第一搬送方向と交差する第二搬送方向に湾曲する湾曲部を前記用紙に形成し、前記湾曲部の第二端部の側の側面から第二端部までを順次第二搬送方向に吸着搬送することによって、前記用紙を反転させることを特徴とする用紙反転方法。
A sheet having a first end and a second end opposite to the first end is conveyed in the first conveyance direction with the first end being the leading end,
While locking the first end of the paper, further transport the paper in the first transport direction,
A curved portion curved in the second transport direction intersecting with the first transport direction is formed on the paper, and the suction transport from the side surface on the side of the second end portion of the curved portion to the second end portion is sequentially performed in the second transport direction. A sheet reversing method, wherein the sheet is reversed.
JP2002203074A 2002-07-11 2002-07-11 Paper reversing device and paper reversing method Expired - Lifetime JP3990216B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002203074A JP3990216B2 (en) 2002-07-11 2002-07-11 Paper reversing device and paper reversing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002203074A JP3990216B2 (en) 2002-07-11 2002-07-11 Paper reversing device and paper reversing method

Publications (2)

Publication Number Publication Date
JP2004043111A true JP2004043111A (en) 2004-02-12
JP3990216B2 JP3990216B2 (en) 2007-10-10

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007105509A1 (en) 2006-03-10 2007-09-20 Duplo Seiko Corporation Sheet reversing and conveying mechanism and sheet reversing and conveying device
US7344238B2 (en) * 2004-09-07 2008-03-18 Fuji Xerox Co., Ltd. Inkjet recording device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7344238B2 (en) * 2004-09-07 2008-03-18 Fuji Xerox Co., Ltd. Inkjet recording device
WO2007105509A1 (en) 2006-03-10 2007-09-20 Duplo Seiko Corporation Sheet reversing and conveying mechanism and sheet reversing and conveying device
US8109510B2 (en) 2006-03-10 2012-02-07 Duplo Seiko Corporation Sheet inverting and conveying mechanism and sheet inverting and conveying apparatus

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