JP2004268416A - Recording medium carrier and recorder - Google Patents

Recording medium carrier and recorder Download PDF

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Publication number
JP2004268416A
JP2004268416A JP2003062536A JP2003062536A JP2004268416A JP 2004268416 A JP2004268416 A JP 2004268416A JP 2003062536 A JP2003062536 A JP 2003062536A JP 2003062536 A JP2003062536 A JP 2003062536A JP 2004268416 A JP2004268416 A JP 2004268416A
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Japan
Prior art keywords
recording medium
suction
recording
end portions
paper
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JP2003062536A
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JP2004268416A5 (en
JP4462832B2 (en
Inventor
Takayuki Ishii
隆幸 石井
Kimisato Shimada
仁学 島田
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Seiko Epson Corp
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Seiko Epson Corp
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Priority to JP2003062536A priority Critical patent/JP4462832B2/en
Application filed by Seiko Epson Corp filed Critical Seiko Epson Corp
Priority to US10/793,698 priority patent/US7530687B2/en
Priority to CNB2004100077480A priority patent/CN100408343C/en
Priority to EP04005299A priority patent/EP1454757B1/en
Priority to CN2007101274329A priority patent/CN101070017B/en
Priority to DE602004026952T priority patent/DE602004026952D1/en
Priority to AT04005299T priority patent/ATE466732T1/en
Publication of JP2004268416A publication Critical patent/JP2004268416A/en
Publication of JP2004268416A5 publication Critical patent/JP2004268416A5/ja
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Publication of JP4462832B2 publication Critical patent/JP4462832B2/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording medium carrier capable of preventing the both side end parts of the recording medium from turning up when the recording medium is carried, and to provide a recorder comprising that recording medium carrier. <P>SOLUTION: The parts of a recording medium carrying surface 122 passing the both side end parts of the recording medium are formed into such structures 126R and 126L as the both side end parts of the recording medium can hang down. After the both side end parts of the recording medium hang down, the recording medium is carried while sustaining that state. Since it does not ride on a partition wall formed on the outside of a dimple (suction chamber) corresponding to the both side end parts and is not turning up by the suction force of a hole (suction hole) in the dimple corresponding to the both side end parts, contamination due to contact with a recording head can be prevented. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、記録媒体を搬送する記録媒体搬送装置及びこの記録媒体搬送装置を備えた記録装置に関する。
【０００２】
【従来の技術】
従来より、記録装置の１つである例えばインクジェット式プリンタにおいては、記録媒体の１つである例えば用紙を用紙搬送装置により記録部に送り込みつつ記録して外部に送り出す構成のものがある。かかるインクジェット式プリンタにおいては、用紙を紙送りローラ及びその従動ローラで挟持して送りつつ記録ヘッドで記録し、排紙ローラ及びその従動ローラとしての拍車ローラで挟持して送って排出するようになっている。
【０００３】
このような用紙搬送装置を備えるインクジェット式プリンタでは、用紙に例えばベタ画像等のように多数のインク滴が吐出される画像が記録される場合には、用紙が多量のインクを吸収して、記録後に記録ヘッド側に波状に膨らむ、いわゆるコックリングが発生する場合がある。そして、このコックリングが発生して発達すると、用紙と記録ヘッドとの間隔が不均一になり、インク滴の飛翔距離がばらつくことにより記録むらが生じ、あるいは、用紙が記録へッドに接触して汚れてしまう不具合がある。そこで、近年、用紙搬送面に用紙搬送方向及びそれと直交する方向に一定ピッチで複数の穴、すなわち格子状に複数の穴を穿孔し、これらの穴を介して吸引ポンプ等で用紙を吸引して上述したコックリングを抑制するインクジェット式プリンタが提案されている（特許文献１、２参照）。
【０００４】
【特許文献１】
特開昭６３−３０３７８１号公報
【特許文献２】
特開平３−２７０号公報
【０００５】
【発明が解決しようとする課題】
上述した従来の吸引式の用紙搬送装置を備えるインクジェット式プリンタには、負圧×面積で規定される吸引力を高めるために各穴の周りにディンプルが形成されているものがある。各ディンプルは各穴に対応して格子状に形成されているため、用紙搬送方向と直交する方向の用紙の両端部、すなわち用紙の両側端部は、その両側端部に対応するディンプルの外側に形成されている仕切壁上に乗ることになる。このため、用紙の両側端部は、その両側端部に対応するディンプル内の穴の吸引力によって跳ね上がり易くなり、記録へッドに接触して汚れてしまうおそれがある。
【０００６】
本発明は、上記のような種々の課題に鑑みなされたものであり、その目的は、記録媒体を搬送する際に記録媒体の両側端部の跳ね上がりを防止することができる記録媒体搬送装置及びこの記録媒体搬送装置を備えた記録装置を提供することにある。
【０００７】
【課題を解決するための手段】
上記目的達成のため、本発明に係る記録媒体搬送装置では、記録媒体搬送面上に供給される記録媒体を吸着しつつ搬送する記録媒体搬送装置であって、前記記録媒体の両側端部が通過する前記記録媒体搬送面の部位は、前記記録媒体の両側端部が垂れ下がることが可能な構造に形成されていることを特徴としている。これにより、記録媒体の両側端部は、垂れ下がった後はその状態が維持されて搬送されるので、従来のように両側端部に対応するディンプル（吸引室）の外側に形成されている仕切壁上に乗ることは無く、その両側端部に対応するディンプル内の穴（吸引孔）の吸引力によって跳ね上げられることも無くなるため、記録へッドとの接触による汚染を防止することができる。
【０００８】
前記記録媒体搬送面の部位は、段状面が形成されていることを特徴としている。また、前記記録媒体搬送面の部位は、傾斜面が形成されていることを特徴としている。これにより、記録媒体の両側端部は、確実に垂れ下がることができる。前記記録媒体搬送面の部位は、前記記録媒体の各サイズに対応して複数形成されていることを特徴としている。これにより、各サイズの記録媒体において記録へッドとの接触による汚染を防止することができる。前記記録媒体搬送面の部位には、記録材を受ける受け部が形成されていることを特徴としている。これにより、いわゆる縁無し記録に対応することができる。
【０００９】
上記目的達成のため、本発明の液体噴射装置では、上記各機能を有する被噴射材搬送装置を備えたことを特徴としている。これにより、上述した各作用効果を奏する液体噴射装置を提供することができる。上記目的達成のため、本発明の記録装置では、上記各搬送装置を備えたことを特徴としている。これにより、上述した各作用効果を奏する記録装置を提供することができる。
【００１０】
【発明の実施の形態】
図１は、本発明の実施形態に係る記録媒体搬送装置を示す側面図である。この記録媒体搬送装置１００は、記録時に記録媒体を吸引保持する吸引ユニット１１０と、吸引ユニット１１０の上流側から下流側へ記録媒体を搬送する記録媒体搬送手段１５０とを備えている。上記吸引ユニット１１０は、記録媒体に記録するための記録へッド２３１に対して、記録媒体搬送路Ｌを挟んで下側に配置されている。そして、上段の吸引部１２０と下段の吸引力発生部１３０から成る上下２段構成の中空箱状に形成されている。
【００１１】
吸引部１２０は、内部に形成された減圧室１２１と、記録媒体搬送面１２２に記録媒体の搬送方向に長い長方形状の凹みとして形成された複数の吸引室１２３と、これら吸引室１２３をそれぞれ減圧室１２１と連通させるべく、上下方向に伸長する上記吸引室１２３より小さい円形の断面積を有する複数の吸引孔１２４とを有している。
【００１２】
吸引力発生部１３０は、吸引部１２０の減圧室１２１と連通孔１３１を介して連通されており、内部に遠心ファンを備えたポンプ１３２を有している。ポンプ１３２は、減圧室１２１の下方の所定位置に連通孔１３１を介して減圧室１２１と連通した状態で取り付けられており、遠心ファンが記録時に回転するようになっている。
【００１３】
記録媒体搬送手段１５０は、記録媒体を記録へッド２３１と吸引ユニット１１０の間に送り込む送りローラ１５１と、この送りローラ１５１に対して上方から圧接される従動ローラ１５２と、記録媒体を外部へ排出する排出ローラ１５３と、この排出ローラ１５３に対して上方から接触される拍車ローラ１５４を備えている。尚、吸引ユニット１１０を排出方向へ移動可能な構成とすること等により、排出ローラ１５３と拍車ローラ１５４を設けないことも可能である。
【００１４】
図２（Ａ）、（Ｂ）は、上記吸引部１２０を示す平面図及びＡ−Ａ線断面側面図である。吸引室１２３は、短辺が所定長さであって長辺が記録媒体搬送面１２２の上流端近傍から下流端近傍に至る長さとなるように形成されている。すなわち、各吸引室１２３は、記録媒体の搬送方向には連通して延び、記録媒体の搬送方向と直交する方向には仕切壁１２５を挟んで並ぶように形成されている。吸引孔１２４は、吸引室１２３の底面において記録媒体の搬送方向に所定ピッチで形成されている。すなわち、吸引孔１２４は、吸引室１２３毎に１列形成されている。
【００１５】
さらに、本発明の特徴的な部分として、記録媒体の搬送方向と直交する方向の記録媒体の両端部、すなわち記録媒体の両側端部が通過する記録媒体搬送面１２２の部位には、記録媒体の両側端部が垂れ下がって逃げることが可能な逃げ部１２６Ｒ、１２６Ｌが形成されている。この逃げ部１２６Ｒ、１２６Ｌは、記録媒体の両側端部が垂れ下がって逃げることが可能なように、記録媒体搬送面１２２よりも低い面、例えば段状の面が形成されていれば良い。
【００１６】
図２に示す例は段状面の逃げ部１２６Ｒ、１２６Ｌであり、記録媒体の右側端部に対応する図示右側端の吸引室１２３Ｒの右側にあった仕切壁１２５を廃し、吸引室１２３Ｒの凹みを記録媒体搬送面１２２の図示右側端までそのまま延長した逃げ部１２６Ｒと、記録媒体の左側端部に対応する図示左側端の吸引室１２３Ｌの左側にあった仕切壁１２５を廃し、吸引室１２３Ｌの凹みをその左隣に存在していた吸引室１２３までそのまま延長した逃げ部１２６Ｌが形成されている。
【００１７】
ここで、記録媒体の両側端部は、逃げ部１２６Ｒ、１２６Ｌ内で垂れ下がった状態となるので、逃げ部１２６Ｒ、１２６Ｌの一部分しか覆っていないことになる。このため、吸引力の低下による記録媒体の吸着搬送不良が懸念される。しかし、記録媒体の両側端部の下面には、その両側端部に対応する吸引室１２３Ｒ、１２３Ｌの吸引孔１２４Ｒ、１２４Ｌにより記録媒体の両側端部の下面と吸引室１２３Ｒ、１２３Ｌの底面との間を通る気流が引き起こす動圧損失と、吸引孔１２４Ｒ、１２４Ｌそのものの動圧損失とによる負圧が発生するので、記録媒体の両側端部を安定的に吸引して搬送することが可能となる。
【００１８】
これにより、図３（Ａ）に示すように、記録媒体Ｐの両側端部ＰＲ、ＰＬは、垂れ下がった後はその状態が維持されて搬送されることになるので、従来技術で述べたように両側端部に対応するディンプル（吸引室）の外側に形成されている仕切壁上に乗ることは無く、その両側端部に対応するディンプル内の穴（吸引孔）の吸引力によって跳ね上げられることも無くなるため、記録へッド２３１との接触による汚染を防止することができる。
【００１９】
また、逃げ部１２６Ｒ、１２６Ｌとして段状面を例に説明したが、記録媒体の両側端部が垂れ下がって逃げることが可能なように記録媒体搬送面１２２よりも低い面であれば良く、例えば傾斜面でも良い。図３（Ｂ）に示す例は傾斜面の逃げ部１２７Ｒ、１２７Ｌであり、記録媒体の右側端部に対応する図示右側端の吸引室１２３Ｒの右側にあった仕切壁１２５を廃し、吸引室１２３Ｒの底面を傾斜させて記録媒体搬送面１２２の図示右側端までそのまま延長した逃げ部１２７Ｒと、記録媒体の左側端部に対応する図示左側端の吸引室１２３Ｌの左側にあった仕切壁１２５を廃し、吸引室１２３Ｌの底面を傾斜させてその左隣に存在していた吸引室１２３までそのまま延長した逃げ部１２７Ｌが形成されている。
【００２０】
この場合も、記録媒体の両側端部は、逃げ部１２７Ｒ、１２７Ｌ内で垂れ下がった状態となるので、逃げ部１２７Ｒ、１２７Ｌの一部分しか覆っておらず、吸引力の低下による記録媒体の吸着搬送不良が懸念される。しかし、記録媒体の両側端部の下面には、その両側端部に対応する吸引室１２３Ｒ、１２３Ｌの吸引孔１２４Ｒ、１２４Ｌにより記録媒体の両側端部の下面と吸引室１２３Ｒ、１２３Ｌの底面との間を通る気流が引き起こす動圧損失と、吸引孔１２４Ｒ、１２４Ｌそのものの動圧損失とによる負圧が発生するので、記録媒体の両側端部を安定的に吸引して搬送することが可能となる。さらに、傾斜面の逃げ部１２７Ｒ、１２７Ｌと記録媒体の両側端部との間隔は、段状面の逃げ部１２６Ｒ、１２６Ｌよりも広くなるので、記録媒体の両側端部が大きく垂れ下がっても接触を回避することができる。したがって、記録媒体の両側端部をより安定的に吸引して搬送することが可能となる。
【００２１】
これにより、図３（Ｂ）に示すように、記録媒体Ｐの両側端部ＰＲ、ＰＬは、垂れ下がった後はその状態が維持されて搬送されることになるので、従来技術で述べたように両側端部に対応するディンプル（吸引室）の外側に形成されている仕切壁上に乗ることは無く、その両側端部に対応するディンプル内の穴（吸引孔）の吸引力によって跳ね上げられることも無くなるため、記録へッド２３１との接触による汚染をより防止することができる。なお、図３（Ｃ）に示すように、逃げ部１２６Ｒ、１２６Ｌの部位に吐出されたインク滴を受けて吸収するスポンジ等のインク吸収材１２８が埋設されたインク受け部１２９を配設しても良い。これにより、記録媒体の全面に記録可能な、いわゆる縁無し記録に対応することができる。
【００２２】
以上のように、吸引穴を吸引孔１２４と吸引室１２３で構成し、さらに吸引孔１２４を小径の貫通孔により形成することで、ポンプ１３２の特性に対して利用できる負圧の利用率を高めると共に、吸引室１２３を吸引孔１２４より面積の大きい略矩形の凹みとして形成することで、記録媒体に対して大きな吸引力を発生できるようになっている。さらに、記録媒体の両側端部に対応する吸引室１２３Ｒ、１２３Ｌの外側にあった仕切壁１２５を廃して逃げ部１２６Ｒ、１２６Ｌ、１２７Ｒ、１２７Ｌを形成しているので、記録媒体の両側端部は、吸引室１２３Ｒ、１２３Ｌ内で垂れ下がった後はその状態が維持されて搬送される。したがって、従来のように記録媒体の両側端部が跳ね上げられることは無くなるため、記録へッド２３１との接触による汚染をより防止することができる。
【００２３】
このような構成の記録媒体搬送装置１００は、以下のように動作する。送りローラ１５１等が回転駆動して、記録媒体を記録ヘッド２３１と吸引ユニット１１０との間に送り込む。一方、ポンプ１３２が駆動して、吸引力を連通孔１３１及び減圧室１２１を介して吸引孔１２４と吸引室１２３に作用させる。これにより、記録媒体は、記録媒体搬送面１２２に吸引吸着された状態で搬送される。同時に、記録へッド２３１が、記録媒体の上方を主走査方向に移動しながら記録媒体に対してインク粒を吐出して記録を行う。
【００２４】
このとき、記録媒体の両側端部は、吸引室１２３Ｒ、１２３Ｌ内で垂れ下がった後はその状態が維持されて搬送されることになる。したがって、記録媒体の両側端部が跳ね上がって記録へッド２３１に接触することによる汚染を防止することができる。そして、排出ローラ１５３等が回転駆動して、記録が終了した記録媒体を外部へ排出する。
【００２５】
図４は、上記記録媒体搬送装置１００を備えた記録装置としてのインクジェット式プリンタを示す斜視図、図５〜図７は、その主要部を示す平面図、正面図及び側面図である。このインクジェット式プリンタ２００は、プリンタ本体２１０の後方上部に斜めに取り付けられた自動給紙（ＡＳＦ）ユニット２２０と、プリンタ本体２１０に内蔵された記録部２３０及び記録媒体搬送装置１００を備えている。記録媒体としては、インクジェット式プリンタ２００の専用紙、普通紙の他、ＯＨＰフィルム、トレーシングペーパ一、ハガキ等各種のものを用いることができる。
【００２６】
ＡＳＦユニット２２０は、用紙１を収容するトレイ２２１と、このトレイ２２１から用紙１を引き出して供給する給紙ローラ２２２等を備えている。記録部２３０は、記録ヘッド２３１及びインクカートリッジ２３２が搭載されたキャリッジ２３３と、このキャリッジ２３３を主走査方向に配設されたガイド軸２３４に沿って移動させるＤＣモータ２３５等を備えている。記録ヘッド２３１は、例えばシアン、マゼンタ、イエロー、ライトシアン、ライトマゼンタ、ライトイエロー、ブラックの各色毎に、例えば９６個等複数のノズルから成るノズル列を有している。
【００２７】
記録媒体搬送装置１００は、記録時に記録媒体を吸引保持する上段の吸引部１２０と下段の吸引力発生部１３０から成る吸引ユニット１１０と、吸引ユニット１１０の上流側から下流側へ記録媒体を搬送する記録媒体搬送手段１５０とを備えている。吸引部１２０は、内部に形成された減圧室１２１と、記録媒体搬送面１２２に記録媒体の搬送方向に長い長方形状の凹みとして形成された複数の吸引室１２３と、これら吸引室１２３をそれぞれ減圧室１２１と連通させる複数の吸引孔１２４とを有している。
【００２８】
そして、記録媒体の搬送方向と直交する方向の記録媒体の両端部、すなわち記録媒体の両側端部が通過する記録媒体搬送面１２２の部位には、記録媒体の両側端部が垂れ下がって逃げることが可能な段状の面でなる逃げ部１２６Ｒ、１２６Ｌが形成されている。これらの逃げ部１２６Ｒ、１２６Ｌは、記録媒体の各サイズ、例えばＪＩＳのＢ５サイズ、Ａ４サイズ、Ｂ４サイズに対応して複数形成されている。これにより、各サイズの記録媒体において記録へッド２３１との接触による汚染を防止することができる。
【００２９】
吸引力発生部１３０は、吸引部１２０の減圧室１２１と連通孔１３１を介して連通されており、内部に遠心ファンを備えたポンプ１３２を有している。ポンプ１３２は、減圧室１２１の下方の所定位置に連通孔１３１を介して減圧室１２１と連通した状態で取り付けられており、遠心ファンが記録時に回転するようになっている。
【００３０】
記録媒体搬送手段１５０は、記録媒体を記録へッド２３１と吸引ユニット１１０の間に送り込む送りローラ１５１と、この送りローラ１５１に対して上方から圧接される従動ローラ１５２とを有している。なお、この実施形態では、記録媒体を外部へ排出する排出ローラ１５３と、この排出ローラ１５３に対して上方から接触される拍車ローラ１５４とが不要な、排出方向へ移動可能な吸引ユニット１１０を有するインクジェット式プリンタ２００としているが、排出ローラ１５３と拍車ローラ１５４を有するインクジェット式プリンタとしても良い。
【００３１】
このような構成のインクジェット式プリンタ２００は、以下のように動作する。図示しないホストコンピュータ等によりトレイ２２１に収容されている用紙１に対する記録命令が入力されると、給紙ローラ２２２が回転駆動して、トレイ２２１に収容されている用紙１を１枚ずつピックアップして給紙する。さらに、送りローラ１５２等が回転駆動して、用紙１を記録ヘッド２３１と吸引ユニット１１０との間に送り込む。
【００３２】
一方、ポンプ１３２が駆動して、吸引力を連通孔１３１及び減圧室１２１を介して吸引孔１２４と吸引室１２３に作用させる。そして、用紙１を記録媒体搬送面１２５に吸引吸着した状態で搬送する。これと同時に、ＤＣモータ２３５が駆動して、タイミングベルトを介してキャリッジ２３３をガイド軸２３４に沿って移動させる。このとき、記録へッド２３１は、インクカートリッジ２３２から各色毎に供給されるインクを記録データに応じて複数のノズルの全部又は一部から微小なインク滴として用紙１上に吐出して記録する。記録媒体の両側端部は、吸引室１２３Ｒ、１２３Ｌ内で垂れ下がった後はその状態が維持されて搬送されることになるので、記録媒体の両側端部が跳ね上がって記録へッド２３１に接触することによる汚染を防止することができる。そして、排出ローラ１５３等が回転駆動して、記録が終了した用紙１を排紙口２０１から外部へ排紙する。
【００３３】
以上説明したように、記録媒体の両側端部は、垂れ下がった後はその状態が維持されて搬送されることになるので、従来技術で述べたように両側端部に対応するディンプル（吸引室）の外側に形成されている仕切壁上に乗ることは無く、その両側端部に対応するディンプル内の穴（吸引孔）の吸引力によって跳ね上げられることも無くなるため、記録ヘッド２３１を記録媒体により近接させることができ、記録精度をさらに向上させることができる。
【００３４】
なお、上述した実施形態では、吸引室１２３を記録媒体の搬送方向に長い長方形状の凹みとして形成したが、従来のような格子状に形成しても同様の効果を得ることができる。また、吸引室１２３を設けずに吸引孔１２４のみ設けた吸引ユニットとしても同様の効果を得ることができる。また、上述した実施形態では、記録媒体を搬送する装置を備えた記録装置について説明したが、例えばインクジェット式プリンタを含む被噴射材を搬送する装置を備えた液体噴射装置についても適用可能であり同一の作用効果を奏する。
【図面の簡単な説明】
【図１】本発明の実施形態に係る記録媒体搬送装置を示す側面図である。
【図２】図１の吸引部を示す平面図及びＡ−Ａ線断面側面図である。
【図３】図１の逃げ部の例を示す断面図である。
【図４】本発明の記録媒体搬送装置を備えた記録装置としてのインクジェット式プリンタを示す斜視図である。
【図５】図４のインクジェット式プリンタの主要部を示す平面図である。
【図６】図４のインクジェット式プリンタの主要部を示す正面図である。
【図７】図４のインクジェット式プリンタの主要部を示す側面図である。
【符号の説明】
１ 用紙、１００ 記録媒体搬送装置、１１０ 吸引ユニット、１２０ 吸引部、１２１ 減圧室、１２２ 記録媒体搬送面、１２３ 吸引室、１２４ 吸引孔、１２５ 仕切壁、１２６Ｒ、１２６Ｌ、１２７Ｒ、１２７Ｌ 逃げ部、１２８ インク吸収材、１２９ インク受け部、１３０ 吸引力発生部、１３１ 連通孔、１３２ ポンプ、１５０ 記録媒体搬送手段、１５１ 送りローラ、１５２ 従動ローラ、１５３ 排出ローラ、１５４ 拍車ローラ、２００ インクジェット式プリンタ、２１０ プリンタ本体、２２０ ＡＳＦユニット、２２１ トレイ、２２２ 給紙ローラ、２３０ 記録部、２３１ 記録ヘッド、２３２ インクカートリッジ、２３３ キャリッジ、２３４ ガイド軸、２３５ ＤＣモータ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recording medium conveying apparatus that conveys a recording medium, and a recording apparatus including the recording medium conveying apparatus.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for example, an ink jet printer, which is one of recording apparatuses, has a configuration in which, for example, a sheet, which is one of recording media, is recorded while being sent to a recording unit by a paper transport device and is sent to the outside. In such an ink jet printer, paper is recorded by a recording head while being nipped and fed by a paper feed roller and its driven roller, and is nipped and sent by a paper discharge roller and a spur roller as its driven roller. ing.
[0003]
In an ink jet printer provided with such a paper transport device, when an image in which a large number of ink droplets are ejected, such as a solid image, is recorded on the paper, the paper absorbs a large amount of ink and is recorded. A so-called cockling that swells later in the recording head side may occur. When this cockling occurs and develops, the gap between the paper and the recording head becomes non-uniform, and the flying distance of ink droplets varies, resulting in uneven recording, or the paper contacts the recording head. There is a problem that gets dirty. Therefore, in recent years, a plurality of holes, that is, a plurality of holes in a lattice shape, are punched at a constant pitch in the paper transport direction and in a direction orthogonal to the paper transport surface, and the paper is sucked with a suction pump or the like through these holes An ink jet printer that suppresses the cockling described above has been proposed (see Patent Documents 1 and 2).
[0004]
[Patent Document 1]
JP-A 63-303781 [Patent Document 2]
Japanese Patent Laid-Open No. 3-270
[Problems to be solved by the invention]
Some inkjet printers equipped with the above-described conventional suction-type paper conveyance device have dimples formed around each hole in order to increase the suction force defined by negative pressure × area. Since each dimple is formed in a lattice shape corresponding to each hole, both end portions of the paper in the direction orthogonal to the paper transport direction, that is, both end portions of the paper are outside the dimples corresponding to the both end portions. It rides on the formed partition wall. For this reason, the both end portions of the sheet are likely to jump up due to the suction force of the holes in the dimples corresponding to the both end portions, and there is a possibility that the recording head will be contaminated.
[0006]
The present invention has been made in view of the various problems as described above, and an object of the present invention is to provide a recording medium transport apparatus capable of preventing the side edges of the recording medium from jumping up when transporting the recording medium, and the recording medium transport apparatus. An object of the present invention is to provide a recording apparatus provided with a recording medium conveying apparatus.
[0007]
[Means for Solving the Problems]
To achieve the above object, the recording medium conveying apparatus according to the present invention is a recording medium conveying apparatus that conveys the recording medium supplied onto the recording medium conveying surface while adsorbing the recording medium. The portion of the recording medium conveyance surface is formed in a structure in which both end portions of the recording medium can hang down. As a result, the both end portions of the recording medium are transported while being maintained after the recording medium hangs down, so that the partition walls formed outside the dimples (suction chambers) corresponding to the both end portions as in the prior art. Since it does not get on top and is not lifted up by the suction force of the hole (suction hole) in the dimple corresponding to the both side end portions, contamination due to contact with the recording head can be prevented.
[0008]
A stepped surface is formed on the recording medium conveying surface. Further, the recording medium conveying surface is formed with an inclined surface. Thereby, the both ends of the recording medium can hang down reliably. A plurality of portions of the recording medium conveyance surface are formed corresponding to each size of the recording medium. Thereby, it is possible to prevent contamination due to contact with the recording head in the recording medium of each size. A receiving portion for receiving a recording material is formed at a portion of the recording medium conveyance surface. Thereby, it is possible to cope with so-called borderless recording.
[0009]
In order to achieve the above object, the liquid ejecting apparatus of the present invention is characterized by including an ejected material conveying apparatus having the above functions. Thereby, it is possible to provide a liquid ejecting apparatus that exhibits the above-described effects. In order to achieve the above object, the recording apparatus of the present invention is characterized by including the above-described respective conveying apparatuses. Thereby, it is possible to provide a recording apparatus that exhibits the above-described effects.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a side view showing a recording medium conveying apparatus according to an embodiment of the present invention. The recording medium transport apparatus 100 includes a suction unit 110 that sucks and holds a recording medium during recording, and a recording medium transport unit 150 that transports the recording medium from the upstream side to the downstream side of the suction unit 110. The suction unit 110 is disposed on the lower side of the recording head 231 for recording on a recording medium with the recording medium conveyance path L interposed therebetween. The upper suction part 120 and the lower suction force generation part 130 are formed in a hollow box shape having an upper and lower two-stage configuration.
[0011]
The suction unit 120 includes a decompression chamber 121 formed therein, a plurality of suction chambers 123 formed as rectangular recesses long in the recording medium transport direction on the recording medium transport surface 122, and the suction chambers 123 respectively decompressed. In order to communicate with the chamber 121, a plurality of suction holes 124 having a circular cross-sectional area smaller than the suction chamber 123 extending in the vertical direction are provided.
[0012]
The suction force generation unit 130 is communicated with the decompression chamber 121 of the suction unit 120 via the communication hole 131 and includes a pump 132 having a centrifugal fan therein. The pump 132 is attached to a predetermined position below the decompression chamber 121 so as to communicate with the decompression chamber 121 via the communication hole 131, and the centrifugal fan rotates during recording.
[0013]
The recording medium conveying means 150 includes a feeding roller 151 that feeds the recording medium between the recording head 231 and the suction unit 110, a driven roller 152 that is pressed against the feeding roller 151 from above, and the recording medium to the outside. A discharge roller 153 for discharging, and a spur roller 154 that comes into contact with the discharge roller 153 from above are provided. It should be noted that the discharge roller 153 and the spur roller 154 can be omitted by making the suction unit 110 movable in the discharge direction.
[0014]
2A and 2B are a plan view and a cross-sectional side view taken along the line AA of the suction unit 120, respectively. The suction chamber 123 is formed so that the short side has a predetermined length and the long side extends from the vicinity of the upstream end of the recording medium conveyance surface 122 to the vicinity of the downstream end. That is, the suction chambers 123 are formed so as to communicate with each other in the recording medium conveyance direction and to be arranged with the partition wall 125 in between in a direction orthogonal to the recording medium conveyance direction. The suction holes 124 are formed at a predetermined pitch in the recording medium transport direction on the bottom surface of the suction chamber 123. That is, the suction holes 124 are formed in one row for each suction chamber 123.
[0015]
Further, as a characteristic part of the present invention, both ends of the recording medium in the direction orthogonal to the recording medium conveyance direction, that is, the portions of the recording medium conveyance surface 122 through which both ends of the recording medium pass are arranged on the recording medium. Escape portions 126R and 126L are formed on both side ends that can hang down and escape. The escape portions 126R and 126L may be formed with a surface lower than the recording medium conveyance surface 122, for example, a stepped surface, so that both end portions of the recording medium can hang down and escape.
[0016]
The example shown in FIG. 2 is stepped relief portions 126R and 126L, and the partition wall 125 on the right side of the suction chamber 123R on the right side of the drawing corresponding to the right end of the recording medium is eliminated, and the suction chamber 123R is recessed. Is removed as it is to the right end of the recording medium conveyance surface 122 and the partition wall 125 on the left side of the suction chamber 123L at the left end of the recording medium corresponding to the left end of the recording medium. An escape portion 126L is formed by extending the dent as it is to the suction chamber 123 existing on the left side.
[0017]
Here, both end portions of the recording medium hang down in the escape portions 126R and 126L, so that only a part of the escape portions 126R and 126L is covered. For this reason, there is a concern that the suction and conveyance failure of the recording medium due to a decrease in suction force. However, the lower surfaces of the both end portions of the recording medium are connected to the lower surfaces of the both end portions of the recording medium and the bottom surfaces of the suction chambers 123R, 123L by the suction holes 124R, 124L of the suction chambers 123R, 123L corresponding to the both end portions. Since a negative pressure is generated due to the dynamic pressure loss caused by the airflow passing between them and the dynamic pressure loss of the suction holes 124R and 124L themselves, it is possible to stably suck and convey the both end portions of the recording medium. .
[0018]
As a result, as shown in FIG. 3A, the both side end portions PR and PL of the recording medium P are transported while being maintained after the sagging, as described in the prior art. It does not get on the partition wall formed outside the dimple (suction chamber) corresponding to both side ends, and can be flipped up by the suction force of the hole (suction hole) in the dimple corresponding to both side ends. Therefore, contamination due to contact with the recording head 231 can be prevented.
[0019]
In addition, the stepped surfaces have been described as examples of the escape portions 126R and 126L, but may be any surface that is lower than the recording medium conveyance surface 122 so that both end portions of the recording medium can hang down and escape. The surface is good. The example shown in FIG. 3 (B) is the relief portions 127R and 127L on the inclined surfaces, and the partition wall 125 on the right side of the suction chamber 123R on the right side of the drawing corresponding to the right end of the recording medium is eliminated, and the suction chamber 123R is removed. The escape portion 127R that is extended as it is to the right end of the recording medium conveyance surface 122 as shown in FIG. 6 and the partition wall 125 that is on the left side of the suction chamber 123L on the left end of the recording medium corresponding to the left end of the recording medium are discarded. An escape portion 127L is formed by inclining the bottom surface of the suction chamber 123L and extending as it is to the suction chamber 123 existing on the left side of the suction chamber 123L.
[0020]
In this case as well, both end portions of the recording medium hang down in the escape portions 127R and 127L, so that only a part of the escape portions 127R and 127L is covered. Is concerned. However, the lower surfaces of the both end portions of the recording medium are connected to the lower surfaces of the both end portions of the recording medium and the bottom surfaces of the suction chambers 123R, 123L by the suction holes 124R, 124L of the suction chambers 123R, 123L corresponding to the both end portions. Since a negative pressure is generated due to the dynamic pressure loss caused by the airflow passing between them and the dynamic pressure loss of the suction holes 124R and 124L themselves, it is possible to stably suck and convey the both end portions of the recording medium. . Further, since the clearance between the inclined surface relief portions 127R and 127L and the both side edge portions of the recording medium is wider than the stepped surface relief portions 126R and 126L, contact is made even if both side edge portions of the recording medium droop significantly. It can be avoided. Therefore, it is possible to more stably suck and convey the both end portions of the recording medium.
[0021]
As a result, as shown in FIG. 3B, the both side end portions PR and PL of the recording medium P are transported while being maintained after they hang down. It does not get on the partition wall formed outside the dimple (suction chamber) corresponding to both side ends, and can be flipped up by the suction force of the hole (suction hole) in the dimple corresponding to both side ends. Therefore, contamination due to contact with the recording head 231 can be further prevented. As shown in FIG. 3C, an ink receiving portion 129 in which an ink absorbing material 128 such as a sponge that receives and absorbs ink droplets discharged to the portions of the escape portions 126R and 126L is embedded. Also good. Thereby, it is possible to cope with so-called borderless recording which can be recorded on the entire surface of the recording medium.
[0022]
As described above, the suction hole is constituted by the suction hole 124 and the suction chamber 123, and the suction hole 124 is formed by a small-diameter through hole, thereby increasing the utilization rate of the negative pressure that can be used for the characteristics of the pump 132. At the same time, by forming the suction chamber 123 as a substantially rectangular recess having a larger area than the suction hole 124, a large suction force can be generated with respect to the recording medium. Furthermore, since the partition walls 125 outside the suction chambers 123R and 123L corresponding to the both end portions of the recording medium are eliminated to form the escape portions 126R, 126L, 127R, and 127L, the both end portions of the recording medium are After the sag in the suction chambers 123R, 123L, the state is maintained and conveyed. Therefore, both end portions of the recording medium are not flipped up as in the conventional case, and contamination due to contact with the recording head 231 can be further prevented.
[0023]
The recording medium transport apparatus 100 having such a configuration operates as follows. The feed roller 151 and the like are rotationally driven to feed the recording medium between the recording head 231 and the suction unit 110. On the other hand, the pump 132 is driven to apply a suction force to the suction hole 124 and the suction chamber 123 through the communication hole 131 and the decompression chamber 121. As a result, the recording medium is conveyed while being sucked and adsorbed on the recording medium conveying surface 122. At the same time, the recording head 231 performs recording by ejecting ink particles onto the recording medium while moving in the main scanning direction above the recording medium.
[0024]
At this time, both end portions of the recording medium are transported while being maintained in the state after hanging in the suction chambers 123R and 123L. Therefore, it is possible to prevent contamination due to the side edges of the recording medium jumping up and coming into contact with the recording head 231. Then, the discharge roller 153 and the like are driven to rotate, and the recording medium on which recording is completed is discharged to the outside.
[0025]
FIG. 4 is a perspective view showing an ink jet printer as a recording apparatus provided with the recording medium conveying apparatus 100, and FIGS. 5 to 7 are a plan view, a front view, and a side view showing the main part. The ink jet printer 200 includes an automatic paper feed (ASF) unit 220 that is obliquely attached to the rear upper part of the printer main body 210, a recording unit 230 and a recording medium transport device 100 built in the printer main body 210. As the recording medium, various kinds of paper such as OHP film, tracing paper, postcard, etc. can be used in addition to the dedicated paper and plain paper of the ink jet printer 200.
[0026]
The ASF unit 220 includes a tray 221 that stores the paper 1, a paper feed roller 222 that pulls out and supplies the paper 1 from the tray 221, and the like. The recording unit 230 includes a carriage 233 on which the recording head 231 and the ink cartridge 232 are mounted, and a DC motor 235 that moves the carriage 233 along a guide shaft 234 disposed in the main scanning direction. The recording head 231 has a nozzle row composed of, for example, 96 nozzles for each color of cyan, magenta, yellow, light cyan, light magenta, light yellow, and black.
[0027]
The recording medium conveyance device 100 conveys the recording medium from the upstream side to the downstream side of the suction unit 110, and the suction unit 110 including an upper suction unit 120 and a lower suction force generation unit 130 that suck and hold the recording medium during recording. Recording medium conveying means 150. The suction unit 120 includes a decompression chamber 121 formed therein, a plurality of suction chambers 123 formed as rectangular recesses long in the recording medium transport direction on the recording medium transport surface 122, and the suction chambers 123 respectively decompressed. A plurality of suction holes 124 communicating with the chamber 121 are provided.
[0028]
Then, both end portions of the recording medium hang down and escape to both ends of the recording medium in a direction orthogonal to the recording medium conveyance direction, that is, the portions of the recording medium conveyance surface 122 through which both end portions of the recording medium pass. Relief portions 126R and 126L that are possible stepped surfaces are formed. A plurality of these relief portions 126R and 126L are formed corresponding to each size of the recording medium, for example, JIS B5 size, A4 size, and B4 size. Thereby, the contamination by the contact with the recording head 231 can be prevented in the recording medium of each size.
[0029]
The suction force generation unit 130 is communicated with the decompression chamber 121 of the suction unit 120 via the communication hole 131 and includes a pump 132 having a centrifugal fan therein. The pump 132 is attached to a predetermined position below the decompression chamber 121 so as to communicate with the decompression chamber 121 via the communication hole 131, and the centrifugal fan rotates during recording.
[0030]
The recording medium transport unit 150 includes a feeding roller 151 that feeds the recording medium between the recording head 231 and the suction unit 110, and a driven roller 152 that is pressed against the feeding roller 151 from above. In this embodiment, the discharge unit 153 that discharges the recording medium to the outside and the spur roller 154 that is in contact with the discharge roller 153 from above are unnecessary, and the suction unit 110 that can move in the discharge direction is provided. Although the inkjet printer 200 is used, an inkjet printer having a discharge roller 153 and a spur roller 154 may be used.
[0031]
The ink jet printer 200 having such a configuration operates as follows. When a recording command for the paper 1 stored in the tray 221 is input by a host computer or the like (not shown), the paper feed roller 222 is rotated to pick up the paper 1 stored in the tray 221 one by one. Feed paper. Further, the feed roller 152 and the like are rotationally driven to feed the paper 1 between the recording head 231 and the suction unit 110.
[0032]
On the other hand, the pump 132 is driven to apply a suction force to the suction hole 124 and the suction chamber 123 through the communication hole 131 and the decompression chamber 121. Then, the sheet 1 is transported while being sucked and adsorbed to the recording medium transport surface 125. At the same time, the DC motor 235 is driven to move the carriage 233 along the guide shaft 234 via the timing belt. At this time, the recording head 231 records the ink supplied from the ink cartridge 232 for each color by ejecting the ink on the paper 1 as fine ink droplets from all or a part of the plurality of nozzles according to the recording data. . Since the both end portions of the recording medium are transported while being maintained in the suction chambers 123R and 123L, the both end portions of the recording medium spring up and come into contact with the recording head 231. It is possible to prevent contamination due to this. Then, the discharge roller 153 and the like are driven to rotate, and the recording-completed sheet 1 is discharged from the discharge port 201 to the outside.
[0033]
As described above, since both end portions of the recording medium are conveyed after being hung down, the dimples (suction chambers) corresponding to the both end portions are described as described in the prior art. The recording head 231 is not moved up by the suction force of the holes (suction holes) in the dimples corresponding to both end portions of the recording head 231 by the recording medium. The recording accuracy can be further improved.
[0034]
In the above-described embodiment, the suction chamber 123 is formed as a rectangular recess that is long in the recording medium conveyance direction. However, the same effect can be obtained by forming the suction chamber 123 in a conventional lattice shape. Further, the same effect can be obtained as a suction unit in which only the suction hole 124 is provided without providing the suction chamber 123. In the above-described embodiment, the recording apparatus including the apparatus for transporting the recording medium has been described. However, for example, the present invention can also be applied to a liquid ejecting apparatus including an apparatus for transporting an ejection target material including an ink jet printer. Has the effect of.
[Brief description of the drawings]
FIG. 1 is a side view showing a recording medium conveying apparatus according to an embodiment of the present invention.
FIG. 2 is a plan view and a cross-sectional side view taken along the line AA of the suction unit of FIG.
FIG. 3 is a cross-sectional view illustrating an example of a relief portion of FIG.
FIG. 4 is a perspective view showing an ink jet printer as a recording apparatus including the recording medium conveying apparatus of the present invention.
5 is a plan view showing a main part of the ink jet printer shown in FIG. 4;
6 is a front view showing a main part of the ink jet printer shown in FIG. 4;
7 is a side view showing a main part of the ink jet printer shown in FIG. 4;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Paper, 100 Recording medium conveyance apparatus, 110 Suction unit, 120 Suction part, 121 Decompression chamber, 122 Recording medium conveyance surface, 123 Suction chamber, 124 Suction hole, 125 Partition wall, 126R, 126L, 127R, 127L Escape part, 128 Ink absorbing material, 129 Ink receiving portion, 130 Suction force generating portion, 131 communication hole, 132 pump, 150 recording medium conveying means, 151 feed roller, 152 driven roller, 153 discharge roller, 154 spur roller, 200 inkjet printer, 210 Printer main body, 220 ASF unit, 221 tray, 222 paper feed roller, 230 recording unit, 231 recording head, 232 ink cartridge, 233 carriage, 234 guide shaft, 235 DC motor

Claims (7)

記録媒体搬送面上に供給される記録媒体を吸着しつつ搬送する記録媒体搬送装置であって、
前記記録媒体の両側端部が通過する前記記録媒体搬送面の部位は、前記記録媒体の両側端部が垂れ下がることが可能な構造に形成されていることを特徴とする記録媒体搬送装置。A recording medium conveying apparatus that conveys a recording medium supplied onto a recording medium conveying surface while adsorbing the recording medium,
The recording medium conveying apparatus, wherein the recording medium conveying surface portion through which both side ends of the recording medium pass is formed in a structure in which both side ends of the recording medium can hang down. 前記記録媒体搬送面の部位は、段状面が形成されていることを特徴とする請求項１に記載の記録媒体搬送装置。The recording medium conveyance apparatus according to claim 1, wherein a stepped surface is formed at a portion of the recording medium conveyance surface. 前記記録媒体搬送面の部位は、傾斜面が形成されていることを特徴とする請求項１に記載の記録媒体搬送装置。2. The recording medium conveying apparatus according to claim 1, wherein an inclined surface is formed at a portion of the recording medium conveying surface. 前記記録媒体搬送面の部位は、前記記録媒体の各サイズに対応して複数形成されていることを特徴とする請求項１〜３の何れか一項に記載の記録媒体搬送装置。The recording medium conveying apparatus according to claim 1, wherein a plurality of portions on the recording medium conveying surface are formed corresponding to each size of the recording medium. 前記記録媒体搬送面の部位には、記録材を受ける受け部が形成されていることを特徴とする請求項１〜４の何れか一項に記載の記録媒体搬送装置。The recording medium transport apparatus according to claim 1, wherein a receiving portion that receives a recording material is formed at a portion of the recording medium transport surface. 請求項１〜５の何れか一項に記載の機能を有する被噴射材搬送装置を備えたことを特徴とする液体噴射装置。A liquid ejecting apparatus comprising the ejected material conveying apparatus having the function according to claim 1. 請求項１〜６の何れか一項に記載の搬送装置を備えたことを特徴とする記録装置。A recording apparatus comprising the transport device according to claim 1.
JP2003062536A 2003-03-07 2003-03-07 RECORDING MEDIUM CONVEYING DEVICE AND RECORDING DEVICE Expired - Fee Related JP4462832B2 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP2003062536A JP4462832B2 (en) 2003-03-07 2003-03-07 RECORDING MEDIUM CONVEYING DEVICE AND RECORDING DEVICE
CNB2004100077480A CN100408343C (en) 2003-03-07 2004-03-05 Dielectric transmitting apparatus and recording equipment
EP04005299A EP1454757B1 (en) 2003-03-07 2004-03-05 Medium transporting device and recording apparatus
CN2007101274329A CN101070017B (en) 2003-03-07 2004-03-05 Medium transporting device
US10/793,698 US7530687B2 (en) 2003-03-07 2004-03-05 Medium transporting device for recording apparatus with suction chambers
DE602004026952T DE602004026952D1 (en) 2003-03-07 2004-03-05 Transport device for recording medium and recording device
AT04005299T ATE466732T1 (en) 2003-03-07 2004-03-05 TRANSPORT DEVICE FOR RECORDING MEDIUM AND RECORDING DEVICE

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JP2006224507A (en) * 2005-02-18 2006-08-31 Seiko Epson Corp Liquid jet device and recording device
CN101823373A (en) * 2009-03-02 2010-09-08 精工爱普生株式会社 Attract press plate mechanism and droplet ejection apparatus
WO2016035371A1 (en) * 2014-09-05 2016-03-10 富士フイルム株式会社 Media conveyance device and image printing apparatus
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JP5219675B2 (en) * 2008-07-31 2013-06-26 キヤノン株式会社 Sheet conveying apparatus and image forming apparatus
JP5543988B2 (en) * 2012-02-21 2014-07-09 富士フイルム株式会社 Paper transport apparatus and ink jet recording apparatus
JP6060634B2 (en) * 2012-11-12 2017-01-18 セイコーエプソン株式会社 Liquid ejector
JP6135103B2 (en) * 2012-11-26 2017-05-31 株式会社リコー Image forming apparatus
CN107696715A (en) * 2017-11-21 2018-02-16 湖北工程职业学院 A kind of support board structure of printer paper delivery

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US6092894A (en) * 1996-12-05 2000-07-25 Toshiba Tec Kabushiki Kaisha Printing medium holding apparatus for a printer using air suction force
JP3662385B2 (en) * 1997-04-18 2005-06-22 オムロン株式会社 Paper transport device
JP4070861B2 (en) * 1998-01-21 2008-04-02 武藤工業株式会社 Inkjet printer

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JP2006224507A (en) * 2005-02-18 2006-08-31 Seiko Epson Corp Liquid jet device and recording device
CN101823373A (en) * 2009-03-02 2010-09-08 精工爱普生株式会社 Attract press plate mechanism and droplet ejection apparatus
WO2016035371A1 (en) * 2014-09-05 2016-03-10 富士フイルム株式会社 Media conveyance device and image printing apparatus
JPWO2016035371A1 (en) * 2014-09-05 2017-04-27 富士フイルム株式会社 Media transport device and image recording device
US9776431B2 (en) 2014-09-05 2017-10-03 Fujifilm Corporation Medium conveying device and image recording apparatus
JP2021094762A (en) * 2019-12-16 2021-06-24 ブラザー工業株式会社 Printing device
JP7427953B2 (en) 2019-12-16 2024-02-06 ブラザー工業株式会社 printing device

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