JP3932863B2 - Paper discharge device - Google Patents

Paper discharge device Download PDF

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Publication number
JP3932863B2
JP3932863B2 JP2001335548A JP2001335548A JP3932863B2 JP 3932863 B2 JP3932863 B2 JP 3932863B2 JP 2001335548 A JP2001335548 A JP 2001335548A JP 2001335548 A JP2001335548 A JP 2001335548A JP 3932863 B2 JP3932863 B2 JP 3932863B2
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Japan
Prior art keywords
paper
recording paper
recording
width direction
paper discharge
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JP2001335548A
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Japanese (ja)
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JP2003137468A (en
Inventor
勝志 庄司
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Murata Machinery Ltd
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Murata Machinery Ltd
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Priority to JP2001335548A priority Critical patent/JP3932863B2/en
Priority to US10/278,304 priority patent/US7149011B2/en
Publication of JP2003137468A publication Critical patent/JP2003137468A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2405/00Parts for holding the handled material
    • B65H2405/10Cassettes, holders, bins, decks, trays, supports or magazines for sheets stacked substantially horizontally
    • B65H2405/11Parts and details thereof
    • B65H2405/115Cover

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  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a paper delivery device capable of straightening curled paper with a simple constitution. SOLUTION: A bend application plate 53 is provided at the position where a recording paper K ejected in the tangential direction of a paper ejecting roller and a pressing roller comes into contact, specifically the undersurface of a reading part. Therefore, when the recording paper K carried in between the ejecting roller and the pressing roller is ejected in the tangential direction of the both rollers, that is, upwardly in a diagonal direction, the upward movement of the recording paper at both end parts in a width direction is controlled by a pair of controlling pieces 53b. That is, the recording paper K is bent in the width direction with its central part disposed above the both end parts, and further in a projecting shape. Thus, even when the paper K is curled along the carrying direction before it reaches in between the paper delivery roller and the pressing roller, the curl of the paper K in the carrying direction can be straightened as the paper K is bent in the width direction.

Description

【0001】
【発明の属する技術分野】
本発明は、複写機能付きファクシミリ装置(以下、複合機という)に代表される排紙装置に関し、より詳しくは、読み取り後の原稿又は記録済みの記録紙等の用紙を排出する排紙装置に関するものである。
【0002】
【従来の技術】
近年、複合機においては、電子写真方式を用いて画像を記録紙に記録する方式が多用されている。この電子写真方式を用いた複合機は、一般的には感光体の表面を一様に帯電させる帯電器、感光体の表面に光を照射して静電潜像を形成する露光器、その静電潜像にトナーケースから供給されるトナーを付着させてトナー画像を形成する現像器、そのトナー画像を記録紙に転写させる転写器、及び転写されたトナー画像を記録紙に定着させる定着器を備えている。そして、感光体への帯電、露光、現像、及び記録紙への転写、定着という一連のプロセスが、電子写真方式における一単位の記録プロセスである。このような記録プロセスを経た記録済みの記録紙は、排紙装置を構成する排紙ローラと加圧ローラとの間を、両ローラの接線方向に通過した後、排出口から排紙トレイ上に排出される。
【0003】
【発明が解決しようとする課題】
ところで、トナー画像を記録紙に定着させる定着器は、トナー画像が形成された記録紙を記録側から加熱する加熱ローラと、その加熱ローラと対向し、記録紙の反記録側を加圧する加圧ローラとから構成されている。即ち、定着時には、記録紙の記録側のみが加熱ローラで加熱されるため、加熱ローラにより加熱される記録紙の記録側と、加熱されずに加圧ローラで加圧される記録紙の反記録側との間には大きな温度差が生じる。従って、記録紙に含まれる水分の蒸発量が記録側と反記録側とでは異なる。具体的には、加熱ローラで加熱される記録側の方が反記録側よりも水分の蒸発量が多い。また、記録紙とトナーとでは熱収縮率が異なり、具体的にはトナーの方が記録紙よりも熱収縮率が大きい。そのため、トナー画像が形成された記録側の方が、トナー画像が形成されない反記録側よりも熱収縮率が大きくなる。その結果、定着後の記録紙、つまり記録済みの記録紙が記録側を内側にしてカールする。
【0004】
特に、卓上型の小型複合機では、記録紙カセットから排紙トレイに至る記録紙の搬送通路が、記録紙の搬送方向に沿って小さな曲率半径で湾曲反転するように形成されている。そのため、記録紙が搬送通路を通過することに伴って、記録紙が搬送方向に湾曲される。従って、定着を経た記録紙が搬送通路の湾曲反転された箇所を通過する構成の場合には、定着によってカールされた記録紙が、搬送通路の湾曲反転された箇所を通過することに伴ってさらにカールされ、かかる場合には、記録紙のカールが助長される。また、記録紙が搬送通路の湾曲反転された箇所を通過した後、その記録紙にトナー画像を定着させる構成の場合には、搬送通路の湾曲反転された箇所を通過することに伴ってカールされた記録紙が、定着によってさらにカールされ、かかる場合にも、記録紙のカールが助長される。
【0005】
その結果、記録紙が搬送方向にカールしたままの状態で排出口付近の排紙トレイ上に排出される。そして、このようにカールされた記録紙が次々に排出されてカールしたままの状態で排出口付近に堆積すると、先に排出された記録紙が、後から排出されてくる記録紙によって押し出されて排紙トレイから落下する可能性がある。
【0006】
そこで、排紙ローラと加圧ローラとの接線方向が斜め上方を向くように両ローラの位置を設定して、記録紙を排出口からできるだけ離間した位置の排紙トレイ上に堆積させる構成が考えられる。しかし、記録紙を読取部と記録部との間の空間に排出する構成の小型複合機の場合には、排出口から斜め上方に向かって排出された記録紙が幅方向の全体に亘って読取部の下面に接触する。そのため、記録紙が接触する部分の面積が広く、記録紙と読取部の下面との間に作用する摩擦力が大きくなってカールが助長される。その結果、排紙トレイ上における記録紙の堆積状態が悪化して、排紙トレイ上に多くの記録紙を堆積できなくなる。特に、排紙トレイ上に堆積可能な記録紙の枚数が元々少ない小型複合機にあっては、カールした記録紙の堆積に伴って、堆積可能な記録紙の枚数がさらに少なくなる。また、後から排出されてくるカールしたままの記録紙が、先に排紙トレイ上に堆積されたカールしたままの記録紙に衝突すると、前記先に排出された記録紙が排紙トレイから落下する可能性がある。
【0007】
一方、記録紙がカールした場合であっても多くの記録紙を堆積可能とするために、排紙トレイ上の空間、つまり読取部と記録部との間の空間を広くとる構成は、複合機の大型化を招くため好ましくない。また、一度カールした記録紙のカールを除去して記録紙を排出口から排紙トレイ上に排出するために、記録紙の搬送通路を上記とは反対側にも湾曲反転させる構成が考えられる。しかし、このように記録紙の搬送通路を反対側にも湾曲反転させる構成は、記録紙の搬送通路が長くなって複合機の大型化を招くとともに、記録紙の搬送通路が長くなった分だけ搬送通路の途中で記録紙のジャムが発生する可能性が高くなるため好ましくない。
【0008】
また、原稿の画像を読み取った後、その読み取り後の原稿を排出する複合機の読取系においては、原稿に光を照射して画像を読み取る方式が多用されている。そのため、光の照射による原稿のカールの程度は、上記のように記録紙を加熱ローラで直接加熱する定着による記録紙のカールよりも小さい。しかし、原稿の搬送通路は、記録紙の搬送通路よりも小さな曲率半径で湾曲反転するように形成されている。そのため、原稿が搬送通路を通過することによるカールの程度は、記録紙が搬送通路を通過することによるカールよりも大きい。その結果、複合機の読取系においても、上記のような複合機の記録系と同様に、原稿の搬送方向にカールが起こり得る。
【0009】
本発明は、このような問題点に着目してなされたものであって、その目的は、簡単な構成で用紙のカールを矯正することが可能な排紙装置を提供することにある。
【0010】
【課題を解決するための手段】
上記の目的を達成するために、請求項1に記載の発明では、排紙ローラと加圧ローラとの間に搬送通路を介して搬送されてきた用紙を両ローラの接線方向に排出する排紙装置において、両ローラの接線方向に排出された用紙が接触する位置に、用紙の排出方向に対して直交する用紙の幅方向に用紙を湾曲させる湾曲付与手段を設け、湾曲付与手段を、両ローラの接線方向に排出された用紙が接触する位置から垂下する複数の、用紙の前記排出方向に沿って延設された規制片で構成し、前記搬送通路は湾曲反転する通路であって、前記排紙ローラ及び加圧ローラの回転に伴って用紙が斜め上方に向けて排出され、用紙の、前記幅方向の両端部における上方への移動を前記規制片で規制することを特徴とする。
【0011】
従って、請求項1に記載の発明によれば、排紙ローラと加圧ローラとの間に搬送されてきた用紙が両ローラの接線方向に排出されると、その用紙は、湾曲付与手段で排出方向に対して直交する幅方向に湾曲される。その結果、用紙が排紙ローラと加圧ローラとの間に達する前に、用紙の搬送方向(排出方向)にカールしている場合であっても、用紙が幅方向に湾曲されることに伴って、用紙の搬送方向のカールが矯正される。また、両ローラの接線方向に排出された用紙は、上方への移動が一対の規制片で規制されて幅方向に湾曲される。つまり、用紙の幅方向において、規制片で規制される部分と規制されない部分とで上下位置が異なり、その結果、用紙は幅方向に湾曲される。また、上記のように用紙の搬送方向のカールを矯正することによって、用紙が搬送方向にカールしたままの状態で排紙トレイ上に堆積することがない。即ち、定着及び搬送通路の通過に伴って搬送方向にカールされた用紙の幅方向の両端部における上方への移動を各規制片で規制することによって、いわば強制的に用紙を排出方向に対して直交する幅方向にカールさせることにより、用紙の搬送方向のカールを除去している。そのため、用紙をフラットな状態で排紙トレイ上に堆積させることができる。
【0012】
請求項2に記載の発明では、請求項1に記載の排紙装置において、前記複数の、用紙の前記排出方向に沿って延設された規制片は、一対の規制片と、該一対の規制片の間に形成されて前記一対の規制片よりも垂下量の少ない規制片とから構成されている。
【0013】
従って、請求項2に記載の発明によれば、両ローラの接線方向に排出された用紙の排出の勢いに関係なく、用紙は各規制片に接触することとなる。したがって、用紙を用紙の幅方向に湾曲させつつ、用紙と湾曲付与手段との間に作用する摩擦力を極力小さくすることができる
【0014】
請求項3に記載の発明では、請求項2に記載の排紙装置において、両ローラの接線方向に排出された用紙が排出方向の上流側から下流側に向かう程、その用紙の幅方向が小さな曲率半径で湾曲されるように前記一対の規制片を設けた。
【0015】
従って、請求項3に記載の発明によれば、両ローラの接線方向に排出された用紙は、排出方向の上流側から下流側に向かう程、幅方向が小さな曲率半径で湾曲される。その結果、用紙の搬送方向のカールが確実に矯正される。
【0016】
【発明の実施の形態】
以下に、本発明に係る排紙装置を複合機に具体化した一実施形態を図面を用いて説明する。
【0017】
図1(a),(b)に示すように、複合機1には、原稿給送部10、読取部20、記録紙供給部30、記録部40及び記録紙排出部50が装設されている。また、読取部20手前のパネルPには、操作部60及び表示部70が配設されている。
【0018】
図2に示すように、原稿給送部10は、原稿Gを載置する原稿台11と、原稿台11上の原稿Gを最上から1枚ずつ分離して読取部20に供給する分離ローラ12と、分離された原稿Gを給送する複数の給送ローラ13とを備えている。また、原稿給送部10は、モータ等の駆動源によって回転駆動される排紙ローラ14と、その排紙ローラ14と対向し、読み取り後の原稿Gを加圧する加圧ローラ15と、排紙ローラ14と加圧ローラ15との接線方向に排出された原稿Gを堆積させる原稿排出台16とを備えている。さらに、原稿給送部10は、原稿給送部10の下方に配設された読取部20に対して開閉回動可能なカバー17を備えている。このカバー17の上部は、原稿排出台16として機能する。
【0019】
読取部20は、静止した状態の原稿Gを読み取るためにカバー17を開けた後で原稿Gを載置する透明な原稿載置板21と、原稿台11上に載置された原稿Gを給送しながら読み取るために原稿Gが上面を通過する透光板22とを備えている。尚、読取部20は、原稿Gに光を照射する光源、原稿Gからの反射光の光路を変更するミラー、光源及びミラーを移動させるための移動機構、ミラーからの光を収束させる集光レンズ、集光レンズを通して入射した光に基づき原稿Gの画像を読み取る撮像素子(CCD)等を備えている(いずれも図示略)。
【0020】
図3に示すように、記録紙供給部30は、所定サイズ、例えば最も使用頻度の多いA4縦サイズ(幅210mm×長さ297mm)の記録紙Kを積層状態で収容する記録紙カセット31を備えている。また、記録紙供給部30は、使用者の所望に応じたサイズの記録紙Kを載置する手差しトレイ32を備えている。さらに、記録紙供給部30は、記録紙カセット31内の記録紙K又は手差しトレイ32上に載置された記録紙Kを最上から1枚ずつ分離して記録部40に供給する給紙ローラ33を備えている。
【0021】
記録部40は、外周面に光導電膜を有する感光体ドラム41と、その感光体ドラム41の光導電膜を所定電位に一様帯電させる帯電器42と、感光体ドラム41上に静電潜像を形成する露光器43と、感光体ドラム41上の静電潜像にトナーを供給して、その静電潜像を現像する現像器44とを備えている。また、記録部40は、トナー画像を感光体ドラム41上から記録紙K上に転写させる転写器45と、記録紙K上のトナー画像を加熱定着させる定着器46とを備えている。そして、この定着器46は、トナー画像が形成された記録紙Kを記録側から加熱する加熱ローラ46aと、その加熱ローラ46aと対向し、記録紙Kの反記録側を加圧する加圧ローラ46bとから構成されている。
【0022】
記録紙排出部50は、モータ等の駆動源によって回転駆動される排紙ローラ51と、その排紙ローラ51と対向し、定着後の記録紙K、つまり記録済みの記録紙Kを加圧する加圧ローラ52とを備えている。具体的には、図4(a),(b)に示すように、排紙ローラ51は、記録紙Kの搬送方向に対して直交する記録紙Kの幅方向に沿って同一軸線上に4個設けられている。また、加圧ローラ52は、排紙ローラ51の直上よりも記録紙Kの搬送方向の上流側に同一軸線上に4個設けられている。
【0023】
そして、モータによって反時計回りに回転される排紙ローラ51と、その排紙ローラ51の回転に伴って従動されて時計回りに回転される加圧ローラ52との接線方向に記録紙Kが排出される。この記録紙Kが排出される方向は、排紙ローラ51及び加圧ローラ52の回転に伴って記録紙Kが排出される接線方向、つまり記録紙Kの搬送方向の上流側から下流側に向かう斜め上方向である。ここで、排紙ローラ51と加圧ローラ52との間に搬送されてきた記録紙Kは、幅方向のセンター基準で排出される。そのため、A4縦サイズ(幅210mm×長さ297mm)の記録紙Kが主に使用される複合機1の場合には、記録紙Kの幅方向に沿って隣り合う2つの排紙ローラ51(加圧ローラ52)の間隔S1〜S3を約70mmにする構成が好ましい。
【0024】
また、図3に示すように、記録紙排出部50は、排紙ローラ51と加圧ローラ52との接線方向に排出された記録紙Kを幅方向に湾曲させる湾曲付与板53と、排出された記録紙Kを堆積させる排紙トレイ54とを備えている。具体的には、図5に示すように、湾曲付与板53は、読取部20の下面に着脱可能に取り付けられた取付部53aと、その取付部53aから垂下された一対の規制片53bとから構成されている。各規制片53bは、記録紙Kの排出方向に沿って延設され、互いに平行である。このように構成された湾曲付与板53に対して、排紙ローラ51と加圧ローラ52との間から斜め上方に向かって記録紙Kが排出されると、記録紙Kは、幅方向の両端部における上方への移動が各規制片53bで規制される。よって、A4縦サイズの記録紙Kが主に使用される複合機1の場合には、両規制片53bの間隔S4を約140mmにする構成が好ましい。
【0025】
次に、複合機1において、記録紙カセット31内の記録紙K又は手差しトレイ32上に載置された記録紙Kに画データを記録して、その記録紙Kを排紙トレイ54に排出するときの作用について、図6(a),(b)を参照しながら図2及び図3を用いて説明する。
【0026】
さて、原稿台11又は原稿載置板21上に載置された原稿Gを読取部20で読み取って、その読み取った原稿Gの画データを記録紙Kにコピーする場合、又は受信画データを記録紙Kに記録する場合には、記録紙Kが給紙ローラ33で1枚ずつ分離される。そして、その分離された記録紙Kが感光体ドラム41と転写器45との間に達すると、記録紙Kにトナー画像が転写される。その後、記録紙Kが加熱ローラ46aと加圧ローラ46bとの間に達すると、記録紙Kにトナー画像が定着される。このとき、記録紙Kは、記録側のみが加熱される。そのため、記録紙Kに含まれる水分の蒸発量が記録側と反記録側とで異なるとともに、記録紙Kとトナーとで熱収縮率が異なるため、定着後の記録紙K、つまり記録済みの記録紙Kは、記録側を内側にしてカールする。そして、このようにカールされた記録紙Kは、湾曲反転された搬送通路を通過することに伴って、トナー画像が定着された記録側を内側にして搬送方向に沿ったカールが助長される(図6(a)参照)。
【0027】
やがて、このように搬送方向にカールされた記録紙Kが排紙ローラ51と加圧ローラ52との間に達すると、記録紙Kは、排紙ローラ51と加圧ローラ52との間から斜め上方に排出される。そして、湾曲付与板53に達した記録紙Kは、幅方向の両端部における上方への移動が各規制片53bで規制される。その結果、記録紙Kは、幅方向の中央部が幅方向の両端部よりも上方位置となった上に凸の形状で幅方向に湾曲される(図6(b)参照)。やがて、記録紙Kの終端が排紙ローラ51と加圧ローラ52との間から排出されると、記録紙Kは、上記のように幅方向に湾曲されることに伴って、搬送方向のカールが矯正された良好な状態で排紙トレイ54上に堆積される。
【0028】
以上、詳述したように本実施形態によれば、次のような作用、効果を得ることができる。
(1)排紙ローラ51と加圧ローラ52との接線方向に排出された記録紙Kが接触する位置、具体的には読取部20の下面に湾曲付与板53を設けている。そのため、排紙ローラ51と加圧ローラ52との間に搬送されてきた記録紙Kが両ローラ51,52の接線方向、つまり斜め上方向に排出されると、その記録紙Kは、幅方向の両端部における上方への移動が一対の規制片53bで規制される。つまり、記録紙Kは、幅方向の中央部が幅方向の両端部よりも上方位置となった上に凸の形状で幅方向に湾曲される。従って、記録紙Kが排紙ローラ51と加圧ローラ52との間に達する前に、記録紙Kの搬送方向にカールしている場合であっても、記録紙Kが幅方向に湾曲されることに伴って、記録紙Kの搬送方向のカールを矯正することができる。
【0029】
(2)上記(1)のように記録紙Kの搬送方向のカールを矯正することによって、記録紙Kが搬送方向(排出方向)にカールしたままの状態で排紙トレイ54上に堆積することがない。即ち、定着及び搬送通路の通過に伴って搬送方向にカールされた記録紙Kの幅方向の両端部における上方への移動を各規制片53bで規制することによって、いわば強制的に記録紙Kを排出方向に対して直交する幅方向にカールさせることにより、記録紙Kの搬送方向のカールを除去している。そのため、記録紙Kをフラットな状態で排紙トレイ54上に堆積させることができる。従って、先に排出された記録紙Kが、後から排出されてくる記録紙Kによって押し出されることはなく、前記先に排出された記録紙Kが排紙トレイ54から落下する可能性はない。また、後から排出されてくる記録紙Kが、先に排紙トレイ54上に堆積された記録紙Kに衝突しても、単に積層されるだけであり、前記先に排出された記録紙Kが排紙トレイ54から落下する可能性はない。その結果、排紙トレイ54上における記録紙Kの堆積状態が良好なものとなり、排紙トレイ54上に多くの記録紙Kを堆積させることができる。
【0030】
(3)一対の規制片53bを含む湾曲付与板53を設けるのみで記録紙Kの搬送方向のカールを矯正する構成である。そのため、記録紙Kが搬送方向にカールした場合であっても多くの記録紙Kを堆積可能とするために、排紙トレイ54上の空間、つまり読取部20と記録紙供給部30との間の空間を広くとる構成にする必要がない。また、一度カールした記録紙Kのカールを除去して記録紙Kを排紙ローラ51と加圧ローラ52との間から排紙トレイ54上に排出するために、記録紙Kの搬送通路を反対側にも湾曲反転させる構成にする必要もない。従って、これら複合機1の大型化を招く構成と比較して、簡単な構成で記録紙Kの搬送方向のカールを矯正することができることは言うまでもない。換言すれば、記録紙Kの搬送方向のカールを矯正しながらにして、複合機1を小型化することができる。
【0031】
(4)排紙ローラ51と加圧ローラ52との間から排出された記録紙Kは、排紙トレイ54に達する前に湾曲付与板53の両規制片53bのみに接触する。そのため、湾曲付与板53を備えていない従来構成と比較して、記録紙Kが接触する部分の面積が格段に狭いため、記録紙Kと湾曲付与板53との間に作用する摩擦力が小さくなる。従って、その摩擦力が原因となってカールが助長されることはなく、排紙トレイ54上における記録紙Kの堆積状態を良好にでき、排紙トレイ54上に多くの記録紙Kを堆積させることができる。また、記録紙Kと湾曲付与板53との間に作用する摩擦力が小さいため、記録紙Kをスムーズに排出することができる。
【0032】
尚、前記実施形態は、次のように変更して具体化することも可能である。
・記録紙Kの排出方向の上流側から下流側に向かう程、一対の規制片53b間の距離を短くした構成としてもよい。具体的には、図7(a)に示すように、記録紙Kの排出方向の上流側から下流側に向かう程、一対の規制片53b間の距離を直線的に短くした構成としてもよい。又は、図7(b),(c)に示すように、記録紙Kの排出方向の上流側から下流側に向かう程、一対の規制片53b間の距離を曲線的に短くした構成としてもよい。これらのように構成すれば、排紙ローラ51と加圧ローラ52との接線方向に排出された記録紙Kは、幅方向の両端部における上方への移動が一対の規制片53bで規制され、上に凸の形状で幅方向に湾曲される。そして、記録紙Kは、排出方向の上流側から下流側に向かう程、幅方向の中央部寄りにおける上方への移動が規制される。つまり、記録紙Kは、排出方向の上流側から下流側に向かう程、幅方向の中央部と幅方向の両端部との高低差が大きな上に凸の形状で幅方向に湾曲される。換言すれば、記録紙Kは、排出方向の上流側から下流側に向かう程、幅方向が小さな曲率半径で湾曲される。従って、記録紙Kの搬送方向のカールを確実に矯正することができる。
【0033】
・記録紙Kの排出方向の上流側から下流側に向かう程、一対の規制片53bの垂下量を長くした構成としてもよい。具体的には、図8(a)に示すように、記録紙Kの排出方向の上流側から下流側に向かう程、一対の規制片53bの垂下量を直線的に長くした構成としてもよい。又は、図8(b),(c)に示すように、記録紙Kの排出方向の上流側から下流側に向かう程、一対の規制片53bの垂下量を曲線的に長くした構成としてもよい。これらのように構成すれば、排紙ローラ51と加圧ローラ52との接線方向に排出された記録紙Kは、幅方向の両端部における上方への移動が一対の規制片53bによって規制され、上に凸の形状で幅方向に湾曲される。そして、記録紙Kは、排出方向の上流側から下流側に向かう程、幅方向の両端部における上方への移動が下方位置で規制される。つまり、記録紙Kは、排出方向の上流側から下流側に向かう程、幅方向の中央部と幅方向の両端部との高低差が大きな上に凸の形状で幅方向に湾曲される。換言すれば、記録紙Kは、排出方向の上流側から下流側に向かう程、幅方向が小さな曲率半径で湾曲される。従って、記録紙Kの搬送方向のカールを確実に矯正することができる。
【0034】
・図9に示すように、規制片53bの垂下量よりも短い規制片53cを、一対の規制片53b間に記録紙Kの排出方向に沿って延設した構成としてもよい。このように構成すれば、記録紙Kが排紙ローラ51と加圧ローラ52との接線方向に勢いよく排出された場合であっても、記録紙Kの幅方向の中央部における上方への移動が規制片53cで規制される。そのため、規制片53cを備えていない場合(図9の2点鎖線参照)と比較して、記録紙Kが接触する部分の面積が狭く、記録紙Kと湾曲付与板53との間に作用する摩擦力が小さくなる。従って、記録紙Kを幅方向に湾曲させながら、記録紙Kをスムーズに排出することができる。
【0035】
・前記実施形態の複合機1は、図1(b)に示すように、読取部20と記録部40との間の空間、つまり排紙トレイ54上の空間が比較的狭い構成である。そのため、排紙ローラ51と加圧ローラ52との接線方向に排出された記録紙Kが接触する位置は、読取部20の下面である。従って、両ローラ51,52の接線方向に排出された記録紙Kを、読取部20の下面に設けた湾曲付与板53で幅方向に湾曲させることができる。
【0036】
このような構成とは異なり、読取部20と記録部40との間の空間が広い構成の複合機1の場合には、両ローラ51,52の接線方向に排出された記録紙Kは、読取部20の下面には接触しない。換言すれば、かかる構成の場合には、両ローラ51,52の接線方向に排出された記録紙Kが接触する位置は、読取部20と記録部40との間の空間である。そこで、このような構成の複合機1において、両ローラ51,52の接線方向に排出された記録紙Kの幅方向の両端部が接触する位置(前記空間)に、一対の規制部材(湾曲付与手段)を吊設し、それら一対の規制部材をねじりコイルばね等の付勢手段で下方に付勢する構成としてもよい。このように構成すれば、一対の規制部材が前記実施形態における一対の規制片53bと同様に機能するため、記録紙Kを幅方向に湾曲させることができる。尚、付勢手段による一対の規制部材の下方への付勢力を、記録紙Kの排出力による一対の規制部材の上方への押し上げ力よりも大きくする必要がある。
【0037】
・読み取り後の原稿Gを排出する排紙装置として原稿給送部10に前記実施形態を適用してもよい。具体的には、図2に2点鎖線で示すように、排紙ローラ14と加圧ローラ15との接線方向に排出された原稿Gが接触する位置、具体的には原稿台11の下面に湾曲付与板53を設けた構成としてもよい。このように構成すれば、簡単な構成で原稿Gのカールを矯正することができる。
【0038】
・画像を記録紙Kに記録した後、その記録済みの記録紙Kを排出するプリンタ等の画像形成装置又は原稿Gの画像を読み取った後、その読み取り後の原稿Gを排出するスキャナ等の画像読取装置に前記実施形態を適用してもよい。
【0039】
さらに、上記実施形態より把握される技術的思想について、以下にそれらの効果と共に記載する。
〔1〕用紙の排出方向の上流側から下流側に向かう程、一対の規制片間の距離を短くした排紙装置。このように構成すれば、両ローラの接線方向に排出された用紙は、幅方向の両端部における上方への移動が一対の規制片で規制され、上に凸の形状で幅方向に湾曲される。そして、用紙は、排出方向の上流側から下流側に向かう程、幅方向の中央部寄りにおける上方への移動が規制される。つまり、用紙は、排出方向の上流側から下流側に向かう程、幅方向の中央部と幅方向の両端部との高低差が大きな上に凸の形状で幅方向に湾曲される。従って、用紙の搬送方向のカールを確実に矯正することができる。
【0040】
〔2〕用紙の排出方向の上流側から下流側に向かう程、一対の規制片の垂下量を長くした排紙装置。このように構成すれば、両ローラの接線方向に排出された用紙は、幅方向の両端部における上方への移動が一対の規制片によって規制され、上に凸の形状で幅方向に湾曲される。そして、用紙は、排出方向の上流側から下流側に向かう程、幅方向の両端部における上方への移動が下方位置で規制される。つまり、用紙は、排出方向の上流側から下流側に向かう程、幅方向の中央部と幅方向の両端部との高低差が大きな上に凸の形状で幅方向に湾曲される。従って、用紙の搬送方向のカールを確実に矯正することができる。
【0041】
【発明の効果】
本発明は、以上のように構成されているため、次のような効果を奏する。
請求項1〜請求項3のいずれか1項に記載の発明によれば、簡単な構成で用紙のカールを矯正することができる。また、用紙のカールを矯正することによって、カールしたままの状態で排紙トレイ上に堆積することがない。
【図面の簡単な説明】
【図1】(a)本実施形態の複合機の斜視図、(b)複合機の正面図。
【図2】複合機上部の正断面図。
【図3】複合機下部の側断面図。
【図4】(a)排紙ローラ及び加圧ローラの配置関係を示す模式平面図。
(b)排紙ローラ及び加圧ローラの配置関係を示す模式側面図。
【図5】湾曲付与板の斜視図。
【図6】(a)搬送方向にカールされた記録紙の形状を示す側面図。
(b)幅方向に湾曲された記録紙の形状を示す正面図。
【図7】(a)〜(c)別の実施形態の湾曲付与板の底面図。
【図8】(a)〜(c)別の実施形態の湾曲付与板の側断面図。
【図9】別の実施形態の湾曲付与板で幅方向に湾曲された記録紙の形状を示す正面図。
【符号の説明】
10…排紙装置としての原稿給送部、14…排紙ローラ、15…加圧ローラ、50…排紙装置としての記録紙排出部、51…排紙ローラ、52…加圧ローラ、53b…湾曲付与手段としての規制片、G…用紙としての原稿、K…用紙としての記録紙。
[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper discharge device represented by a facsimile machine with a copying function (hereinafter referred to as a multifunction machine), and more particularly to a paper discharge device that discharges a document such as a document after reading or recorded recording paper. It is.
[0002]
[Prior art]
In recent years, in a multi-function peripheral, a method of recording an image on recording paper using an electrophotographic method has been frequently used. In general, a multi-function machine using the electrophotographic method is a charger that uniformly charges the surface of the photoconductor, an exposure device that irradiates light on the surface of the photoconductor to form an electrostatic latent image, and a static device. A developing device that forms a toner image by attaching toner supplied from a toner case to an electrostatic latent image, a transfer device that transfers the toner image onto a recording paper, and a fixing device that fixes the transferred toner image onto the recording paper. I have. A series of processes of charging to the photoreceptor, exposure, development, transfer to recording paper, and fixing is a unit recording process in the electrophotographic system. Recorded recording paper that has undergone such a recording process passes between the paper discharge roller and the pressure roller constituting the paper discharge device in the tangential direction of both rollers, and then passes from the discharge port onto the paper discharge tray. Discharged.
[0003]
[Problems to be solved by the invention]
By the way, the fixing device for fixing the toner image on the recording paper is a heating roller that heats the recording paper on which the toner image is formed from the recording side, and a pressure that opposes the heating roller and presses the non-recording side of the recording paper. It consists of a roller. That is, at the time of fixing, only the recording side of the recording paper is heated by the heating roller, so that the recording side of the recording paper heated by the heating roller and the anti-recording of the recording paper pressed by the pressure roller without being heated are recorded. There is a large temperature difference between the two sides. Therefore, the evaporation amount of moisture contained in the recording paper is different between the recording side and the non-recording side. Specifically, the amount of moisture evaporated is larger on the recording side heated by the heating roller than on the non-recording side. Further, the thermal contraction rate differs between the recording paper and the toner, and specifically, the thermal contraction rate of the toner is larger than that of the recording paper. Therefore, the thermal contraction rate is larger on the recording side on which the toner image is formed than on the non-recording side on which the toner image is not formed. As a result, the fixed recording sheet, that is, the recorded recording sheet is curled with the recording side inward.
[0004]
In particular, in a desktop small-sized multifunction peripheral, the recording paper conveyance path from the recording paper cassette to the paper discharge tray is formed so as to be curved and inverted with a small curvature radius along the recording paper conveyance direction. Therefore, the recording paper is bent in the transport direction as the recording paper passes through the transport path. Therefore, in the case where the recording paper that has undergone fixing passes through the curved portion of the conveyance path, the recording paper curled by the fixing further passes through the curved portion of the conveyance path. In such a case, curling of the recording paper is promoted. Also, in the case of a configuration in which the toner image is fixed on the recording paper after the recording paper passes through the curved portion of the conveyance path, the recording paper is curled as it passes through the curved portion of the conveyance path. The recording sheet is further curled by fixing, and in this case, the recording sheet is also curled.
[0005]
As a result, the recording paper is discharged onto the paper discharge tray near the discharge port while being curled in the transport direction. When the curled recording sheets are discharged one after another and accumulated near the discharge port in a curled state, the previously discharged recording sheet is pushed out by the recording sheet discharged later. There is a possibility of falling from the output tray.
[0006]
Therefore, a configuration in which the positions of both rollers are set so that the tangential direction between the discharge roller and the pressure roller faces obliquely upward, and the recording paper is deposited on the discharge tray at a position as far as possible from the discharge port is considered. It is done. However, in the case of a small multi-function peripheral configured to discharge recording paper to the space between the reading unit and the recording unit, the recording paper discharged obliquely upward from the discharge port is read over the entire width direction. Contact the lower surface of the part. For this reason, the area of the portion in contact with the recording paper is large, and the frictional force acting between the recording paper and the lower surface of the reading unit is increased to promote curling. As a result, the recording paper accumulation state on the paper discharge tray deteriorates, and a large amount of recording paper cannot be accumulated on the paper discharge tray. In particular, in a small-sized multi-function peripheral that originally has a small number of recording sheets that can be accumulated on the paper discharge tray, the number of recording sheets that can be accumulated further decreases as the curled recording sheets accumulate. In addition, when the curled recording paper discharged later collides with the curled recording paper previously deposited on the discharge tray, the previously discharged recording paper falls from the discharge tray. there's a possibility that.
[0007]
On the other hand, in order to allow a large amount of recording paper to be deposited even when the recording paper is curled, a configuration in which a space on the paper discharge tray, that is, a space between the reading unit and the recording unit is widened is a multifunction device. This is not preferable because it leads to an increase in size. Further, in order to remove the curl of the recording paper that has been curled once and to discharge the recording paper from the discharge port onto the paper discharge tray, a configuration in which the conveyance path of the recording paper is curved and reversed on the opposite side to the above can be considered. However, the configuration in which the recording paper conveyance path is curved and reversed on the opposite side in this way is the same as the recording paper conveyance path becomes long and the size of the multifunction machine increases. This is not preferable because there is a high possibility of recording paper jamming in the middle of the conveyance path.
[0008]
Also, in a reading system of a multi-function peripheral that reads an image of a document and then discharges the document after the reading, a method of reading an image by irradiating the document with light is frequently used. Therefore, the degree of curling of the document due to light irradiation is smaller than the curling of the recording paper due to fixing in which the recording paper is directly heated by the heating roller as described above. However, the document conveyance path is formed so as to be curved and reversed with a smaller radius of curvature than the recording paper conveyance path. For this reason, the degree of curling due to the document passing through the transport path is greater than the curl due to the recording paper passing through the transport path. As a result, even in the reading system of the multi-function peripheral, curling can occur in the document transport direction as in the multi-function recording system described above.
[0009]
The present invention has been made paying attention to such problems, and an object of the present invention is to provide a paper discharge device capable of correcting paper curl with a simple configuration.
[0010]
[Means for Solving the Problems]
  In order to achieve the above object, according to the first aspect of the present invention, the paper discharged from the paper discharge roller and the pressure roller through the conveyance path is discharged in the tangential direction of both rollers. In the apparatus, at a position where the paper discharged in the tangential direction of both rollers contacts, a bending applying means for bending the paper in the width direction of the paper perpendicular to the paper discharging direction is provided, Multiple hangs from the position where the paper discharged in the tangential direction ofAnd extended along the paper discharge directionThe conveying path is a path that is curved and reversed, and the sheet is discharged obliquely upward along with the rotation of the discharge roller and the pressure roller.The upward movement of both ends of the paper in the width direction is restricted by the restriction piece.It is characterized by that.
[0011]
  Therefore, according to the first aspect of the present invention, when the paper conveyed between the paper discharge roller and the pressure roller is discharged in the tangential direction of the two rollers, the paper is discharged by the curve applying means. Curved in the width direction perpendicular to the direction. As a result, the paper transport direction before the paper reaches between the paper discharge roller and the pressure roller(Discharge direction)Even when the paper is curled, the curling in the paper transport direction is corrected as the paper is curved in the width direction. In addition, the sheet discharged in the tangential direction of both rollers is curved in the width direction while the upward movement is regulated by the pair of regulating pieces. That is, in the width direction of the paper, the vertical position differs between the portion restricted by the restriction piece and the portion not restricted, and as a result, the paper is curved in the width direction.Further, by correcting the curl in the paper transport direction as described above, the paper does not accumulate on the paper discharge tray in a state of being curled in the transport direction. That is, by restricting the upward movement at both ends in the width direction of the paper curled in the transport direction as it passes through the fixing and transport passages, the paper is forcibly forced in the discharge direction. By curling in the orthogonal width direction, the curl in the paper transport direction is removed. Therefore, the sheets can be deposited on the sheet discharge tray in a flat state.
[0012]
  According to a second aspect of the present invention, in the paper discharge device according to the first aspect, the plurality of paper discharge devicesAnd extended along the paper discharge directionThe restricting piece includes a pair of restricting pieces and a restricting piece that is formed between the pair of restricting pieces and has a smaller amount of droop than the pair of restricting pieces.
[0013]
  Therefore, according to the second aspect of the invention, the paper discharged in the tangential direction of both rollersRegardless of the momentum of discharge, the sheet comes into contact with each regulating piece. Therefore, it is possible to minimize the frictional force acting between the paper and the bending imparting means while curving the paper in the width direction of the paper..
[0014]
According to a third aspect of the present invention, in the paper discharge device according to the second aspect, the width direction of the paper decreases as the paper discharged in the tangential direction of both rollers moves from the upstream side to the downstream side in the discharge direction. The pair of restricting pieces are provided so as to be curved with a radius of curvature.
[0015]
Therefore, according to the third aspect of the invention, the paper discharged in the tangential direction of both rollers is curved with a smaller radius of curvature in the width direction from the upstream side to the downstream side in the discharge direction. As a result, the curl in the paper transport direction is reliably corrected.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which a paper discharge device according to the present invention is embodied in a multifunction machine will be described with reference to the drawings.
[0017]
As shown in FIGS. 1A and 1B, the multifunction device 1 is provided with a document feeding unit 10, a reading unit 20, a recording paper supply unit 30, a recording unit 40, and a recording paper discharge unit 50. Yes. An operation unit 60 and a display unit 70 are arranged on the panel P in front of the reading unit 20.
[0018]
As illustrated in FIG. 2, the document feeding unit 10 separates the document table 11 on which the document G is placed, and the separation roller 12 that separates the document G on the document table 11 one by one from the top and supplies it to the reading unit 20. And a plurality of feed rollers 13 for feeding the separated document G. Further, the document feeder 10 includes a paper discharge roller 14 that is rotationally driven by a drive source such as a motor, a pressure roller 15 that faces the paper discharge roller 14 and presses the original G after reading, and a paper discharge. A document discharge table 16 for depositing the document G discharged in the tangential direction between the roller 14 and the pressure roller 15 is provided. Further, the document feeding unit 10 includes a cover 17 that can be opened and closed with respect to the reading unit 20 disposed below the document feeding unit 10. The upper part of the cover 17 functions as a document discharge table 16.
[0019]
The reading unit 20 supplies a transparent document placing plate 21 on which the document G is placed after the cover 17 is opened to read the stationary document G, and a document G placed on the document table 11. A translucent plate 22 through which the document G passes the upper surface is provided for reading while being fed. The reading unit 20 includes a light source that irradiates the original G with light, a mirror that changes the optical path of reflected light from the original G, a moving mechanism for moving the light source and the mirror, and a condensing lens that converges the light from the mirror. And an image pickup device (CCD) for reading an image of the original G based on light incident through the condenser lens (not shown).
[0020]
As shown in FIG. 3, the recording paper supply unit 30 includes a recording paper cassette 31 that stores recording paper K of a predetermined size, for example, A4 vertical size (width 210 mm × length 297 mm), which is most frequently used, in a stacked state. ing. The recording paper supply unit 30 includes a manual feed tray 32 on which recording paper K having a size according to the user's desire is placed. Further, the recording paper supply unit 30 separates the recording paper K in the recording paper cassette 31 or the recording paper K placed on the manual feed tray 32 one by one from the top and feeds it to the recording unit 40. It has.
[0021]
The recording unit 40 includes a photoconductive drum 41 having a photoconductive film on the outer peripheral surface, a charger 42 that uniformly charges the photoconductive film of the photoconductive drum 41 to a predetermined potential, and an electrostatic latent image on the photoconductive drum 41. An exposure unit 43 that forms an image and a developing unit 44 that supplies toner to the electrostatic latent image on the photosensitive drum 41 and develops the electrostatic latent image are provided. The recording unit 40 also includes a transfer unit 45 that transfers the toner image from the photosensitive drum 41 onto the recording paper K, and a fixing unit 46 that heats and fixes the toner image on the recording paper K. The fixing unit 46 includes a heating roller 46a that heats the recording paper K on which the toner image is formed from the recording side, and a pressure roller 46b that opposes the heating roller 46a and presses the non-recording side of the recording paper K. It consists of and.
[0022]
The recording paper discharge unit 50 is opposed to the paper discharge roller 51 rotated by a drive source such as a motor, and presses the fixed recording paper K, that is, the recorded recording paper K. And a pressure roller 52. Specifically, as shown in FIGS. 4A and 4B, the discharge rollers 51 are arranged on the same axis along the width direction of the recording paper K perpendicular to the conveyance direction of the recording paper K. One is provided. Further, four pressure rollers 52 are provided on the same axis on the upstream side in the conveyance direction of the recording paper K from directly above the paper discharge roller 51.
[0023]
Then, the recording paper K is discharged in a tangential direction between the paper discharge roller 51 rotated counterclockwise by the motor and the pressure roller 52 driven clockwise as the paper discharge roller 51 rotates. Is done. The direction in which the recording sheet K is discharged is a tangential direction in which the recording sheet K is discharged as the discharge roller 51 and the pressure roller 52 rotate, that is, from the upstream side to the downstream side in the conveyance direction of the recording sheet K. It is diagonally upward. Here, the recording paper K conveyed between the paper discharge roller 51 and the pressure roller 52 is discharged based on the center reference in the width direction. For this reason, in the case of the multifunction machine 1 in which the recording paper K of A4 vertical size (width 210 mm × length 297 mm) is mainly used, the two discharge rollers 51 (additional) along the width direction of the recording paper K are used. A configuration in which the intervals S1 to S3 of the pressure roller 52) are about 70 mm is preferable.
[0024]
Further, as shown in FIG. 3, the recording paper discharge section 50 is discharged with a curve imparting plate 53 that curves the recording paper K discharged in the tangential direction between the discharge roller 51 and the pressure roller 52 in the width direction. And a paper discharge tray 54 on which the recording paper K is deposited. Specifically, as shown in FIG. 5, the bending imparting plate 53 includes an attachment portion 53 a that is detachably attached to the lower surface of the reading portion 20, and a pair of regulating pieces 53 b that are suspended from the attachment portion 53 a. It is configured. Each regulating piece 53b extends along the discharge direction of the recording paper K and is parallel to each other. When the recording paper K is discharged obliquely upward from between the paper discharge roller 51 and the pressure roller 52 to the bend imparting plate 53 configured in this way, the recording paper K has both ends in the width direction. The upward movement of the portion is restricted by each restriction piece 53b. Therefore, in the case of the multifunction machine 1 in which A4 vertical size recording paper K is mainly used, a configuration in which the interval S4 between the two regulating pieces 53b is about 140 mm is preferable.
[0025]
Next, in the multifunction device 1, image data is recorded on the recording paper K in the recording paper cassette 31 or the recording paper K placed on the manual feed tray 32, and the recording paper K is discharged to the paper discharge tray 54. The operation at this time will be described with reference to FIGS. 2 and 3 with reference to FIGS.
[0026]
When the original G placed on the original table 11 or the original placement plate 21 is read by the reading unit 20 and the image data of the read original G is copied to the recording paper K, or the received image data is recorded. When recording on the paper K, the recording paper K is separated one by one by the paper feed roller 33. When the separated recording paper K reaches between the photosensitive drum 41 and the transfer device 45, the toner image is transferred to the recording paper K. Thereafter, when the recording paper K reaches between the heating roller 46a and the pressure roller 46b, the toner image is fixed on the recording paper K. At this time, only the recording side of the recording paper K is heated. For this reason, the evaporation amount of water contained in the recording paper K is different between the recording side and the non-recording side, and the thermal shrinkage rate is different between the recording paper K and the toner. The paper K is curled with the recording side inward. As the recording paper K curled in this way passes through the curved and reversed conveying path, curling along the conveying direction is promoted with the recording side on which the toner image has been fixed facing inside ( (See FIG. 6 (a)).
[0027]
Eventually, when the recording paper K curled in the transport direction reaches between the paper discharge roller 51 and the pressure roller 52, the recording paper K is inclined from between the paper discharge roller 51 and the pressure roller 52. It is discharged upward. Then, the recording sheet K that has reached the bending imparting plate 53 is restricted by the restricting pieces 53b from moving upward at both ends in the width direction. As a result, the recording sheet K is curved in the width direction in a convex shape with the center portion in the width direction positioned above the both ends in the width direction (see FIG. 6B). Eventually, when the end of the recording paper K is discharged from between the paper discharge roller 51 and the pressure roller 52, the recording paper K is curled in the width direction as described above. Is deposited on the paper discharge tray 54 in a good state.
[0028]
As described above, according to the present embodiment, the following operations and effects can be obtained.
(1) A curve imparting plate 53 is provided at a position where the recording paper K discharged in the tangential direction between the paper discharge roller 51 and the pressure roller 52 contacts, specifically, on the lower surface of the reading unit 20. Therefore, when the recording paper K conveyed between the paper discharge roller 51 and the pressure roller 52 is discharged in the tangential direction of the two rollers 51, 52, that is, obliquely upward, the recording paper K is The upward movement at the both end portions is restricted by the pair of restricting pieces 53b. In other words, the recording sheet K is curved in the width direction in a convex shape with the center portion in the width direction positioned above the both ends in the width direction. Therefore, even when the recording paper K is curled in the conveyance direction of the recording paper K before reaching the space between the paper discharge roller 51 and the pressure roller 52, the recording paper K is curved in the width direction. Accordingly, the curling in the conveyance direction of the recording paper K can be corrected.
[0029]
(2) By correcting the curling in the transport direction of the recording paper K as described in (1) above, the recording paper K is deposited on the paper discharge tray 54 while being curled in the transport direction (discharge direction). There is no. In other words, by restricting the upward movement at both ends in the width direction of the recording paper K curled in the transport direction along with the fixing and passage of the transport path, each control piece 53b is forcibly forced. Curling in the conveyance direction of the recording paper K is removed by curling in the width direction orthogonal to the discharge direction. Therefore, the recording paper K can be deposited on the paper discharge tray 54 in a flat state. Therefore, the recording paper K discharged first is not pushed out by the recording paper K discharged later, and there is no possibility that the recording paper K discharged first falls from the paper discharge tray 54. Further, even if the recording paper K discharged later collides with the recording paper K previously deposited on the paper discharge tray 54, the recording paper K is simply stacked, and the recording paper K discharged earlier is merely stacked. Is not likely to fall from the paper discharge tray 54. As a result, the recording paper K is well deposited on the paper discharge tray 54, and a large amount of recording paper K can be deposited on the paper discharge tray 54.
[0030]
(3) The curling in the conveyance direction of the recording paper K is corrected only by providing the curve imparting plate 53 including the pair of regulating pieces 53b. For this reason, even when the recording paper K is curled in the transport direction, a large amount of recording paper K can be accumulated, that is, between the reading unit 20 and the recording paper supply unit 30. It is not necessary to have a configuration that takes a large space. Further, in order to remove the curl of the recording sheet K once curled and discharge the recording sheet K from between the discharge roller 51 and the pressure roller 52 onto the discharge tray 54, the conveyance path of the recording sheet K is reversed. There is no need to be configured to bend and invert the side. Accordingly, it goes without saying that curling in the conveyance direction of the recording paper K can be corrected with a simple configuration as compared with the configuration that causes the multifunction device 1 to become large. In other words, the multifunction device 1 can be reduced in size while correcting curling in the conveyance direction of the recording paper K.
[0031]
(4) The recording paper K discharged from between the paper discharge roller 51 and the pressure roller 52 comes into contact only with both the regulating pieces 53 b of the curve applying plate 53 before reaching the paper discharge tray 54. Therefore, compared with the conventional configuration that does not include the curvature imparting plate 53, the area of the portion that contacts the recording paper K is much smaller, so the frictional force acting between the recording paper K and the curvature imparting plate 53 is small. Become. Therefore, curling is not promoted due to the frictional force, the recording paper K can be deposited on the paper discharge tray 54 in a good condition, and a large amount of recording paper K is deposited on the paper discharge tray 54. be able to. Further, since the frictional force acting between the recording paper K and the curve imparting plate 53 is small, the recording paper K can be discharged smoothly.
[0032]
In addition, the said embodiment can also be changed and actualized as follows.
The distance between the pair of regulating pieces 53b may be shortened from the upstream side to the downstream side in the discharge direction of the recording paper K. Specifically, as shown in FIG. 7A, the distance between the pair of regulating pieces 53b may be linearly shortened from the upstream side to the downstream side in the discharge direction of the recording paper K. Alternatively, as shown in FIGS. 7B and 7C, the distance between the pair of restricting pieces 53b may be shortened in a curved manner from the upstream side to the downstream side in the discharge direction of the recording paper K. . With this configuration, the recording paper K discharged in the tangential direction between the paper discharge roller 51 and the pressure roller 52 is restricted from moving upward at both ends in the width direction by the pair of restriction pieces 53b. Curved in the width direction with an upwardly convex shape. Then, the upward movement of the recording sheet K near the center in the width direction is restricted as it goes from the upstream side in the discharge direction to the downstream side. That is, the recording paper K is curved in the width direction with a convex shape that has a large height difference between the central portion in the width direction and both end portions in the width direction as it goes from the upstream side to the downstream side in the discharge direction. In other words, the recording paper K is curved with a smaller radius of curvature in the width direction as it goes from the upstream side to the downstream side in the discharge direction. Therefore, the curl in the conveyance direction of the recording paper K can be reliably corrected.
[0033]
A configuration may be adopted in which the amount of drooping of the pair of regulating pieces 53b is increased from the upstream side toward the downstream side in the discharge direction of the recording paper K. Specifically, as shown in FIG. 8A, the hanging amount of the pair of regulating pieces 53b may be linearly increased from the upstream side toward the downstream side in the discharge direction of the recording paper K. Alternatively, as shown in FIGS. 8B and 8C, the hanging amount of the pair of regulating pieces 53b may be increased in a curve as it goes from the upstream side to the downstream side in the discharge direction of the recording paper K. . With such a configuration, the recording sheet K discharged in the tangential direction between the discharge roller 51 and the pressure roller 52 is restricted from moving upward at both ends in the width direction by the pair of restriction pieces 53b. Curved in the width direction with an upwardly convex shape. Then, as the recording sheet K moves from the upstream side to the downstream side in the discharge direction, the upward movement at both ends in the width direction is restricted at the lower position. That is, the recording paper K is curved in the width direction with a convex shape that has a large height difference between the central portion in the width direction and both end portions in the width direction as it goes from the upstream side to the downstream side in the discharge direction. In other words, the recording paper K is curved with a smaller radius of curvature in the width direction as it goes from the upstream side to the downstream side in the discharge direction. Therefore, the curl in the conveyance direction of the recording paper K can be reliably corrected.
[0034]
As shown in FIG. 9, a restriction piece 53c that is shorter than the hanging amount of the restriction piece 53b may be extended along the discharge direction of the recording paper K between the pair of restriction pieces 53b. With this configuration, even when the recording paper K is ejected vigorously in the tangential direction between the paper ejection roller 51 and the pressure roller 52, the recording paper K moves upward in the center in the width direction. Is regulated by the regulation piece 53c. Therefore, compared with the case where the regulation piece 53 c is not provided (see the two-dot chain line in FIG. 9), the area of the portion in contact with the recording paper K is narrow and acts between the recording paper K and the curve imparting plate 53. The frictional force is reduced. Accordingly, the recording paper K can be smoothly discharged while the recording paper K is curved in the width direction.
[0035]
As shown in FIG. 1B, the multifunction device 1 of the above embodiment has a configuration in which the space between the reading unit 20 and the recording unit 40, that is, the space on the paper discharge tray 54 is relatively narrow. Therefore, the position where the recording paper K discharged in the tangential direction between the paper discharge roller 51 and the pressure roller 52 comes into contact with the lower surface of the reading unit 20. Therefore, the recording sheet K discharged in the tangential direction of both rollers 51 and 52 can be bent in the width direction by the curve applying plate 53 provided on the lower surface of the reading unit 20.
[0036]
Unlike such a configuration, in the case of the multifunction machine 1 having a wide space between the reading unit 20 and the recording unit 40, the recording paper K discharged in the tangential direction of both rollers 51 and 52 is read. It does not contact the lower surface of the part 20. In other words, in the case of such a configuration, the position where the recording paper K discharged in the tangential direction of both the rollers 51 and 52 contacts is the space between the reading unit 20 and the recording unit 40. Therefore, in the MFP 1 having such a configuration, a pair of regulating members (curving imparting) is provided at a position (the space) where both ends in the width direction of the recording paper K discharged in the tangential direction of the rollers 51 and 52 are in contact with each other. (Means) may be suspended and the pair of regulating members may be biased downward by biasing means such as a torsion coil spring. If comprised in this way, since a pair of control member functions similarly to a pair of control piece 53b in the said embodiment, the recording paper K can be curved in the width direction. Note that the downward biasing force of the pair of regulating members by the biasing means needs to be larger than the upward pushing force of the pair of regulating members due to the discharge force of the recording paper K.
[0037]
The above-described embodiment may be applied to the document feeding unit 10 as a paper discharge device that discharges the document G after reading. Specifically, as indicated by a two-dot chain line in FIG. 2, the position where the original G discharged in the tangential direction between the paper discharge roller 14 and the pressure roller 15 contacts, specifically, the lower surface of the original table 11. It is good also as a structure which provided the curve provision board 53. FIG. If comprised in this way, the curl of the original G can be corrected with a simple construction.
[0038]
An image of an image forming apparatus such as a printer that discharges the recorded recording paper K after recording the image on the recording paper K or an image of a scanner that discharges the original G after reading the image of the original G You may apply the said embodiment to a reader.
[0039]
  Furthermore, the technical idea grasped from the above embodiment will be described below together with the effects thereof.
  [1〕forA paper discharge device in which the distance between the pair of regulating pieces is shortened from the upstream side to the downstream side in the paper discharge direction. According to this configuration, the paper discharged in the tangential direction of both rollers is restricted from moving upward at both ends in the width direction by the pair of restriction pieces, and is curved in the width direction with a convex shape. . Then, the upward movement of the sheet toward the center in the width direction is restricted as it goes from the upstream side to the downstream side in the discharge direction. That is, the paper is curved in the width direction with a convex shape that has a large height difference between the central portion in the width direction and both end portions in the width direction as it goes from the upstream side to the downstream side in the discharge direction. Accordingly, it is possible to reliably correct the curl in the sheet conveyance direction.
[0040]
  [2〕forA paper discharge device in which the hanging amount of the pair of restricting pieces is increased from the upstream side to the downstream side in the paper discharge direction. According to this configuration, the sheet discharged in the tangential direction of both rollers is restricted from moving upward at both ends in the width direction by the pair of restriction pieces, and is curved in the width direction with a convex shape upward. . Then, as the sheet moves from the upstream side to the downstream side in the discharge direction, the upward movement at both ends in the width direction is restricted at the lower position. That is, the paper is curved in the width direction with a convex shape that has a large height difference between the central portion in the width direction and both end portions in the width direction as it goes from the upstream side to the downstream side in the discharge direction. Accordingly, it is possible to reliably correct the curl in the sheet conveyance direction.
[0041]
【The invention's effect】
  Since this invention is comprised as mentioned above, there exist the following effects.
  According to the invention described in any one of claims 1 to 3, the curl of the paper can be corrected with a simple configuration.Further, by correcting the curl of the paper, it does not accumulate on the paper discharge tray in a curled state.
[Brief description of the drawings]
FIG. 1A is a perspective view of a multifunction machine according to an embodiment, and FIG. 1B is a front view of the multifunction machine.
FIG. 2 is a front sectional view of the upper part of the multifunction machine.
FIG. 3 is a side sectional view of the lower part of the multifunction machine.
FIG. 4A is a schematic plan view showing an arrangement relationship between a paper discharge roller and a pressure roller.
(B) A schematic side view showing a positional relationship between a paper discharge roller and a pressure roller.
FIG. 5 is a perspective view of a bending imparting plate.
FIG. 6A is a side view illustrating the shape of a recording sheet curled in the conveyance direction.
(B) The front view which shows the shape of the recording paper curved in the width direction.
FIGS. 7A to 7C are bottom views of a curvature imparting plate according to another embodiment. FIGS.
8A to 8C are side cross-sectional views of another embodiment of a curvature imparting plate.
FIG. 9 is a front view showing the shape of a recording sheet that is curved in the width direction by a curvature imparting plate according to another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Document feeding part as paper discharge device, 14 ... Paper discharge roller, 15 ... Pressure roller, 50 ... Recording paper discharge part as paper discharge device, 51 ... Paper discharge roller, 52 ... Pressure roller, 53b ... A regulating piece as a bending imparting means, G: a document as a sheet, K: a recording sheet as a sheet.

Claims (3)

排紙ローラと加圧ローラとの間に搬送通路を介して搬送されてきた用紙を両ローラの接線方向に排出する排紙装置において、両ローラの接線方向に排出された用紙が接触する位置に、用紙の排出方向に対して直交する用紙の幅方向に用紙を湾曲させる湾曲付与手段を設け、湾曲付与手段を、両ローラの接線方向に排出された用紙が接触する位置から垂下する複数の、用紙の前記排出方向に沿って延設された規制片で構成し、前記搬送通路は湾曲反転する通路であって、前記排紙ローラ及び加圧ローラの回転に伴って用紙が斜め上方に向けて排出され、用紙の、前記幅方向の両端部における上方への移動を前記規制片で規制することを特徴とする排紙装置。In a paper discharge device that discharges paper conveyed through a conveyance path between a paper discharge roller and a pressure roller in the tangential direction of both rollers, the paper discharged in the tangential direction of both rollers contacts the paper. A curving application means for curving the paper in the width direction of the paper perpendicular to the paper discharge direction, and the curving application means hangs down from a position where the paper discharged in the tangential direction of both rollers contacts . It is composed of a regulation piece extending along the paper discharge direction, and the conveyance path is a path that curves and reverses, and the paper is directed obliquely upward as the paper discharge roller and pressure roller rotate. The paper discharge device is characterized in that the upward movement of the discharged paper at both ends in the width direction is restricted by the restriction piece . 請求項1に記載の排紙装置において、前記複数の、用紙の前記排出方向に沿って延設された規制片は、一対の規制片と、該一対の規制片の間に形成されて前記一対の規制片よりも垂下量の少ない規制片とから構成されている排紙装置。The paper discharge device according to claim 1, wherein the plurality of restriction pieces extending along the paper discharge direction are formed between a pair of restriction pieces and the pair of restriction pieces. The sheet discharge device is configured by a restriction piece having a smaller amount of droop than the restriction piece. 請求項2に記載の排紙装置において、両ローラの接線方向に排出された用紙が排出方向の上流側から下流側に向かう程、その用紙の幅方向が小さな曲率半径で湾曲されるように前記一対の規制片を設けた排紙装置。  3. The paper discharge device according to claim 2, wherein the paper discharged in the tangential direction of both rollers is curved with a small curvature radius in the width direction of the paper as it goes from the upstream side to the downstream side in the discharge direction. A paper discharge device provided with a pair of regulating pieces.
JP2001335548A 2001-10-30 2001-10-31 Paper discharge device Expired - Lifetime JP3932863B2 (en)

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JP2001335548A JP3932863B2 (en) 2001-10-31 2001-10-31 Paper discharge device
US10/278,304 US7149011B2 (en) 2001-10-30 2002-10-23 Image reading apparatus and image forming apparatus

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JP2001335548A JP3932863B2 (en) 2001-10-31 2001-10-31 Paper discharge device

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JP3932863B2 true JP3932863B2 (en) 2007-06-20

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