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JP3989162B2 - Wet image forming apparatus and cleaning apparatus - Google Patents
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JP3989162B2 - Wet image forming apparatus and cleaning apparatus - Google Patents

Wet image forming apparatus and cleaning apparatus Download PDF

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JP3989162B2
JP3989162B2 JP2000189564A JP2000189564A JP3989162B2 JP 3989162 B2 JP3989162 B2 JP 3989162B2 JP 2000189564 A JP2000189564 A JP 2000189564A JP 2000189564 A JP2000189564 A JP 2000189564A JP 3989162 B2 JP3989162 B2 JP 3989162B2
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JP2002006712A (en
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佐藤  修
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Ricoh Co Ltd
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Ricoh Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、複写機、ファクシミリ、プリンター等に適用される湿式画像形成装置およびこれに採用されるクリーニング装置に関するものである。
【0002】
【従来の技術】
従来、湿式画像形成装置に採用されるクリーニング装置としては、像担持体表面に当接させたクリーニングブレードにより、像担持体上の残留現像液を除去するものが知られている。図13は、その代表的なものの概略構成をしめす断面図である。図13にしめすクリーニング装置では、クリーニングブレード2の先端エッジが、時計方向に回転する像担持体としての感光体1の第一象限において、感光体1に対して当接するよう配置しており、クリーニングブレード2の先端肉厚面2aは上向きとなる。また、クリーニングブレード2は、その背面2bの根本部で、クリーニングブレード2を支持するクリーニングブレードホルダ5を介して、クリーニングブレード2を加圧するホルダ支持加圧部材6に取り付けられている。このクリーニング装置では、感光体1上の残留現像液は、クリーニンングブレード2の先端肉厚面2aにより堰き止められ、クリーニングブレード2の先端肉厚面2aと感光体1とが形成する空間に液溜まり7を形成する。液溜まり7の現像液は、感光体1の回転に伴い、感光体1の回転方向下流側へ移動しようとする。ところが、該現像液は、クリーニングブレード2の先端肉厚面2aに堰き止められているので、クリーニングブレード2の先端肉厚面2aを乗り越えて、クリーニングブレード背面2b上に移動する。このような動作により、感光体1上の残留現像液を除去する。
【0003】
このようなクリーニング装置において、上記液溜まり7の現像液は、クリーニングブレード2の稜線方向にも移動する。現像液がクリーニングブレード背面2b上に移動する前に、クリーニングブレード2の稜線方向に移動し側端にまで達してしまうと、クリーニングブレード2の側端から現像液が流出し、液リング9とよばれる、感光体1上に環状の現像液が付着する現象が発生する(図12参照)。この液リング9は、感光体1の回転中は環状であるが、停止時には感光体1の下端に移動して液ダレとなってしまう。また、液リング9の現像液に対して、クリーニングブレード2と感光体1とが形成する楔形の狭い空間8が毛細管現象の毛管として働き、現像液が該空間8に回り込むこともある。これらは、かぶりや機内の汚れ、多色機における混色などの原因となる。
【0004】
上述のように、液リング9はクリーニングブレード2の先端肉厚面2aが上向きであり、クリーニンングブレード2の先端肉厚面2aにより堰き止められ現像液がクリーニングブレードの先端肉厚面2aと感光体1とが形成する空間に液溜まり7となるような場合、具体的には時計方向に回転する感光体1の第1、4象限、または、その近傍にクリーニングブレード2が当接する場合に発生する。液リング9の発生は、クリーニングブレード2と感光体1との当接位置を工夫すれば、ある程度抑えることはできる。しかし、設計の自由度が少なくなるというデメリットがある。
【0005】
また、特開平08−030157号公報では、感光体ドラムの有効像形成領域の側方から残留現像液を排出するクリーニングブレードを具備するクリーニング装置、さらには排出された残留現像液を受け取る回収経路を備え、回収経路が感光体ドラムの端面を含んでいるクリーニング装置が提案されている。ところが、上記公報記載のクリーニング装置では、装置が大型化してしまう。さらに回収経路を備えた装置では、複雑な構成となってしまう。
【0006】
ところで、像担持体表面に当接させたクリーニングブレードにより、像担持体上の残留現像液を除去するクリーニング装置においては、クリーニングブレードのビビリを回避し、安定したクリーニング動作をおこなうために、図13のクリーニング装置のように、クリーニングブレード2の根本部に、クリーニングブレード2の揺動中心となるホルダ支持加圧部材6を背面2bから突出するよう配設するものが一般的である。このクリーニング装置では、クリーニングブレード背面2b上に移動した現像液は、重力に従い、鉛直方向下方となるクリーニングブレード2の根本部に向かって背面2b上を流下する。そして、クリーニングブレード2の根本部で、背面2bから突出して配設されたホルダ支持加圧部材6に堰き止められ、クリーニングブレード背面2b上およびホルダ支持加圧部材6上に滞留する。滞留した現像液11は、時間が経つにつれ、クリーニングブレード2の稜線方向に移動してクリーニングブレード2の側端から、または、ホルダ加圧部材6を乗り越えて、鉛直下方に落下し、鉛直下方に配設される図示しない現像液回収部に回収される。
【0007】
ところが、クリーニングブレード背面2b上に滞留する現像液11の量が多くなると、滞留した現像液11が、感光体1の回転に伴い感光体1上の液溜まり7の現像液がクリーニングブレード背面2b上に移動しようとする動きを停滞させる。感光体1上の現像液がクリーニングブレード背面2b上に移動する動きが停滞し、クリーニングブレード背面2b上に移動するまで時間を要してしまうと、この間に感光体1上の液溜まり7の現像液がクリーニングブレード2の稜線方向に移動してしまいやすく、上記液リング9が発生し易い状況となる。
【0008】
【発明が解決しようとする課題】
本発明は、上記問題点に鑑み、その目的とするところは、クリーニングブレードによる液リングの発生を抑え、かぶりや機内の汚れ、多色機における混色等を防止できる簡易で小型な湿式画像形成装置およびこれに採用されるクリーニング装置を提供することである。
【0009】
【課題を解決するための手段】
上記目的を達成するために、請求項1の発明は、クリーニングブレードの先端肉厚面が上向きになるよう先端エッジを像担持体表面に当接させ、該クリーニングブレードにて像担持体上の残留現像液を除去するクリーニング装置において、該クリーニングブレードの先端肉厚面と該像担持体とが形成する空間に配置される先端部と、該クリーニングブレードの背面と間隙をもって対向する面とを備えた現像液回収部材を有し、該現像液回収部材のクリーニングブレード背面と対向する面に複数のリブを設けたことを特徴とするものである。
【0010】
請求項1のクリーニング装置においては、現像液回収部材の先端部が像担持体とクリーニングブレードの先端肉厚面とが形成する空間に形成された液溜まりの現像液を捕捉し、該現像液がクリーニングブレードの稜線方向ヘ移動することを防止する。また、液溜まりの現像液は、像担持体の回転方向上流側から搬送される新たな残留現像液に押し出されることによりクリーニングブレード背面上へ移動する。さらに、クリーニングブレードの背面と現像液回収部材のクリーニングブレードの背面と間隙をもって対向する面(以下、腹面という)とが形成する間隙において、液溜まりの現像液が現像液回収部材の先端部より腹面を伝って後端部に向かって移動する。このような現像液の動きにより、液溜まりの現像液を像担持体上から速やかに除去する。以下、これについて詳細に説明する。
像担持体上の残留現像液は、クリーニンングブレードの先端肉厚面により堰き止められ、クリーニングブレードの先端肉厚面と像担持体とが形成する空間に液溜まりを形成する。
像担持体の停止時には、この液溜まりの現像液は凹面状のメニスカスを形成する。ここで、クリーニングブレードの先端肉厚面と像担持体とが形成する空間に配置される現像液回収部材の先端部が、凹面状のメニスカスを形成している液溜まりの液面に接触して現像液を捕捉する。現像液は表面張力により捕捉された部分が凸になるメニスカスを形成する。また、液溜まりの現像液は現像液回収部材の先端部に捕捉されることにより移動しにくくなる。このため、像担持体の停止時に液溜まりの現像液はクリーニングブレードの稜線方向へ移動しにくくなる。
また、像担持体の回転時には、液溜まりの現像液は凸面状のメニスカスを形成して盛り上がりると共に、像担持体の回転方向上流側から搬送される新たな残留現像液に押し出されることにより、クリーニングブレードの先端肉厚面を乗り越えてクリーニングブレード背面上に移動する。さらに、現像液回収部材の先端部に捕捉されている液溜まりの現像液は、その表面張力により、クリーニングブレード背面と現像液回収部材の腹面とが形成する間隙において、現像液回収部材の先端部から腹面を伝って後端部に向かって移動する。このような現像液回収部材による現像液の動きが加わることで、速やかに液溜まりの現像液を像担持体上から除去することができる。
以上のことより、クリーニングブレードのみのクリーニング装置に比較して、本発明のクリーニング装置は、液溜まりの現像液をクリーニングブレードの稜線方向へ移動しにくくするとともに、速やかに像担持体上から残留現像液を除去することができる。このため、本発明のクリーニング装置では、簡易な構成で、液リングが発生する虞を少なくすることができ、かぶりや機内汚れ、多色機における混色等を防止することができる。また、クリーニングブレードの長さを長くすることがないので、装置を小型にできる。また、クリーニングブレードと像担持体との当接位置に関して、設計の自由度も大きいというメリットもある。
そして、上記現像液回収部材のクリーニングブレード背面と対向する面に複数のリブを設けたことにより、次の作用を奏する。
すなわち、現像液回収部材の先端部に捕捉されている現像液は、その表面張力により、クリーニングブレード背面と現像液回収部材の腹面とが形成する間隙において、現像液回収部材の先端部から腹面と腹面に設けられた複数のリブを伝って後端部に向かって移動する。このように、現像液は腹面に設けた複数のリブを伝うことから、現像液が伝う面積は広くなる。このため、現像液回収部材は多量の現像液を伝わせることができるようになり、像担持体上からの現像液の移動は速くなる。
クリーニングブレード背面と現像液回収部材の腹面とが形成する間隙において、表面張力により現像液回収部材の先端部から腹面を伝って後端部に向かって移動する現像液の動きは、クリーニングブレード背面と現像液回収部材の腹面とが形成する間隙が狭すぎると移動できる現像液の量が少なくなる。像担持体上からの現像液の移動が速やかに行えない。しかしながら、本発明では、腹面に設けられたリブにより、クリーニングブレード背面と現像液回収部材の腹面とは適当な間隙が保たれているので、間隙が狭すぎて像担持体上 からの現像液の移動が速やかに行えない虞もない。
このように、現像液回収部材の腹面に設けられたリブを伝う現像液の動きが加わることで、さらに速やかに液溜まりの現像液を像担持体上から除去することができる。
【0011】
ところで、上記現像液回収部材を設けると、像担持体上の液溜まりの現像液の一部は、現像液回収部材の腹面と反対側の面(以下、背面という)へも移動してしまう。現像液回収部材の背面へ移動した現像液は、現像液回収部材の背面を伝って不必要な領域に進入して機内汚れ、多色機における混色等を引き起こすおそれがある。
【0012】
そこで、請求項2の発明は、請求項1のクリーニング装置において、上記現像液回収部材に開口を設けたことを特徴とするものである。
【0013】
請求項2のクリーニング装置においては、現像液回収部材に設けた開口より、現像液回収部材の背面上の現像液は、現像液回収部材の腹面および対向するクリーニングブレード背面へ移動し、現像液回収部材の腹面および対向するクリーニングブレード背面上を流下する。これにより、現像液回収部材の背面を伝って不必要な領域へ現像液が回り込み、機内汚れ、多色機における混色等が発生することを防止する。
【0016】
請求項の発明は、請求項1または2のクリーニング装置において、上記現像液回収部材のリブを上記クリーニングブレードの背面先端と接触するよう配置したことを特徴とするものである。
【0017】
請求項のクリーニング装置においては、リブをクリーニングブレード背面先端と接触するよう配置することで、リブがクリーニングブレード背面先端と現像液回収部材の背面との間隙を一定に保つ機能を果たす。これにより、別途間隙を保持するための手段を設けることなく、容易に、クリーニングブレード背面と現像液回収部材の腹面との間隙を一定の適当なものに保つことができる。そこで、クリーニングブレード背面と現像液回収部材の腹面との間隙が狭すぎて、像担持体上からの現像液の移動が速やかに行えない虞もなく、像担持体上から速やかに現像液を除去することができる。
【0018】
請求項の発明は、請求項1,2またはのクリーニング装置において、上記クリーニングブレードを支持加圧するブレード支持加圧部材を、上記クリーニングブレードの根本部において、クリーニングブレード背面と現像液回収部材との間隙を塞ぐよう配置するとともに、上記現像液回収部材のリブを現像液回収部材の後端にいくに従い側端に向かうよう斜めに配置したことを特徴とするものである。
【0019】
請求項のクリーニング装置においては、現像液回収部材のリブが、クリーニングブレード背面と現像液回収部材の腹面とが形成する間隙において、現像液回収部材の腹面またはリブを伝って後端部に向かって移動する現像液を、現像液回収部材の後端に移動するに従い側端に向かって斜めに移動するよう誘導する。
比較例として、リブを現像液回収部材の後端に向かって真っ直ぐに配置する場合を考える。この場合、上記現像液は、現像液回収部材の先端部から後端部に向かってほぼ真っ直ぐに移動し、クリーニングブレードの根本部において、クリーニングブレード背面と現像液回収部材との間隙を塞ぐよう配置されたブレード支持加圧部材に堰き止められ滞留する。滞留した現像液は、時間が経つにつれ、ブレード支持加圧部材上を稜線方向に移動してその側端から鉛直下方に落下し回収される。ところが、現像液がブレード支持加圧部材上を側端に移動するまで時間を要してしまうと、ブレード支持加圧部材上に滞留する現像液の量が多くなり、現像液回収部材の腹面、リブまたはクリーニングブレード背面上にも現像液が滞留しまう。現像液回収部材の腹面、リブまたはクリーニングブレード背面上にも現像液が滞留すると、現像液回収部材の先端部に捕捉された現像液が表面張力により現像液回収部材の先端部から腹面またはリブを伝って後端部に向かって移動する現像液の動きを停滞させてしまう。
そこで、本発明では、クリーニングブレード背面と現像液回収部材の腹面とが形成する間隙において、現像液回収部材の腹面またはリブを伝って後端部に向かって移動する現像液を、現像液回収部材の後端に移動するに従い側端に向かって斜めに移動するよう誘導する。現像液は現像液回収部材の側端に向かって誘導され該側端より落下したり、または、クリーニングブレードの根本部においてクリーニングブレード背面と現像液回収部材との間隙を塞ぐよう配置されたブレード支持加圧部材の側端近傍に誘導され、速やかにブレード支持加圧部材の側端から落下する。このような現像液の流れを作ることで、ブレード支持加圧部材上に滞留する現像液の量を減少させ、現像液回収部材の腹面、リブまたはクリーニングブレード背面上にも現像液が滞留することを防止する。このため、クリーニングブレード背面と現像液回収部材の腹面とが形成する間隙において、液溜まりの現像液が表面張力により現像液回収部材の先端部から腹面を伝って後端部に向かって移動する現像液の動きが停滞することを防止できる。
【0020】
請求項の発明は、請求項1、2、3または4のクリーニング装置において、上記クリーニングブレードを支持加圧するブレード支持加圧部材を上記クリーニングブレードの根本部において、クリーニングブレード背面と現像液回収部材との間隙を塞ぐよう配置するとともに、上記ブレード支持加圧部材の側端に向かって傾斜した傾斜面を有する現像液搬送部材を上記ブレード支持加圧部材上に配設したことを特徴とするものである。
請求項6の発明は、クリーニングブレードの先端肉厚面が上向きになるよう先端エッジを像担持体表面に当接させ、該クリーニングブレードにて像担持体上の残留現像液を除去するクリーニング装置において、該クリーニングブレードの先端肉厚面と該像担持体とが形成する空間に配置される先端部と、該クリーニングブレードの背面と間隙をもって対向する面とを備えた現像液回収部材を有し、上記クリーニングブレードを支持加圧するブレード支持加圧部材を上記クリーニングブレードの根本部において、クリーニングブレード背面と現像液回収部材との間隙を塞ぐよう配置するとともに、上記ブレード支持加圧部材の側端に向かって傾斜した傾斜面を有する現像液搬送部材を上記ブレード支持加圧部材上に配設したことを特徴とするものである。
【0021】
これらのクリーニング装置においては、像担持体の回転時により、クリーニングブレードの先端肉厚面を乗り越えてクリーニングブレード背面上に移動した現像液は、クリーニングブレード背面上を先端部から根本部に向かって流下し、クリーニングブレード背面と現像液回収部材との間隙を塞ぐように設けられた現像液搬送部材に達する。また、像担持体の回転時により、クリーニングブレード背面と現像液回収部材の腹面とが形成する間隙において、現像液回収部材の腹面またはリブを伝って後端部に向かって移動する現像液の一部は、重力によりクリーニングブレード背面上に滴下して、クリーニングブレード背面上を根本部に向かって流下して、クリーニングブレード背面と現像液回収部材との間隙を塞ぐように設けられた現像液搬送部材に達する。さらに、クリーニングブレード背面と現像液回収部材の腹面とが形成する間隙において、現像液回収部材の腹面またはリブを伝ってそのまま後端部に移動した現像液も、クリーニングブレード背面と現像液回収部材との間隙を塞ぐように設けられた現像液搬送部材に達する。このように、現像液搬送部材に達した現像液は、現像液搬送部材の傾斜面上をブレード支持加圧部材の側端へ向かって斜めに流下する。そして、ブレード支持加圧部材の側端より鉛直方向下方に落下する。このため、ブレード支持加圧部材がクリーニングブレード根本部において、クリーニングブレード背面から突出し、現像液回収部材との間隙を塞ぐよう配置されていても、現像液がブレード支持加圧部材に堰き止められて滞留することを防止できる。これにより、像担持体上の現像液の移動が停滞することを防止できる。
【0022】
請求項7の発明は、静電潜像を担持する像担持体と、該像担持体上の静電潜像を現像液を用いて顕像化する湿式現像装置と、該像担持体上の顕像を被転写体に転写したのち、像担持体上から残留現像液を除去するクリーニング装置とを備えた湿式画像形成装置において、上記クリーニング装置として、請求項1、2、3、4、5または6のクリーニング装置を用いたことを特徴とするものである。
【0023】
請求項7の湿式画像形成装置においては、小型で簡易な手段で、クリーニングブレードによる液リングの発生を抑えることができる。よって、簡易で小型な湿式電子写真装置で、かぶりや機内の汚れ、多色機における混色等のないを高画質な画像を得ることができる。
【0024】
【発明の実施の形態】
以下、本発明を湿式画像形成装置である湿式電子写真複写機に適用した一実施形態について説明する。
図1は本実施形態に係る湿式電子写真複写機の主要部の概略構成図である。図1にしめす湿式電子写真複写機は、像担持体としての感光体1の周辺に、感光体1の表面を帯電する帯電装置12、レーザー光線等を感光体1に照射して静電潜像を形成する潜像形成手段としての露光装置13、感光体1に形成された静電潜像を、キャリア液体中にトナーを分散した現像液を用いてトナー像化する湿式現像装置14、感光体1上に形成されたトナー像を転写体としての転写紙に転写する転写装置15、転写後に感光体1上に残った残留現像液を除去するクリーニング装置16等が順に配設されている。また、給紙トレイ17より転写紙を給紙する給紙搬送装置18と、トナー像を転写された転写紙が感光体1から分離した後、トナーを転写紙に定着する定着装置19とが備えられている。
【0025】
上述のように構成された湿式電子写真複写機では、矢印a方向に回転する感光体1の表面は帯電装置12により一様に帯電された後、画像情報に基づき露光装置13のレーザー光線等を照射され、感光体1上に潜像形成を形成する。感光体1上に形成された静電潜像を、湿式現像装置14より現像液を供給することで顕像化する。一方、転写紙は給紙搬送装置18により給紙トレイ17より給紙され、次いで感光体1と転写装置15とが対向する転写部に搬送される。そして転写装置15により、転写紙に感光体1上のトナー像とは逆極性の電荷を付与することで、感光体1上に形成されたトナー像を転写紙へ転写する。次いで、転写紙は、感光体1から分離され、定着装置19に送られ、トナーを転写紙に定着することで画像が得られる。一方、感光体1上の残留現像液は、以下詳細に説明するクリーニング装置16にて除去される。
【0026】
図2は本実施形態の湿式電子写真複写機に採用されるクリーニング装置16の概略構成をしめす断面図である。図2のクリーニング装置16は、矢印a方向に回転する感光体1の第一象限において、その表面に当接するクリーニング部材としてのクリーニングブレード2と、クリーニングブレード背面2bと対向して配置される現像液回収部材3と、図示しない回収部とを備えている。クリーニングブレード2は、その先端エッジが感光体1の表面にカウンタ方向で当接するよう配置されており、クリーニングブレード2の先端肉厚面2は上向きとなる。クリーニングブレード2はその背面2bの根本部でクリーニングブレード支持部材としてのブレードホルダ5に接着され、さらにブレードホルダ5を介して揺動中心となるブレード支持加圧部材としてのホルダ支持加圧部材6に取り付けられている。このホルダ支持加圧部材6は、クリーニングブレード背面2bと現像液回収部材3との間隙を塞ぐよう配置されている。なお、図2ではブレードホルダ5とホルダ支持加圧部材6とが別部材である例を示したが、一体とすることもできる。さらに、ホルダ支持加圧部材6上に、ホルダ支持加圧部材6の側端に向かって傾斜した傾斜面を有する現像液搬送部材4が、クリーニングブレード背面2bと現像液回収部材3との間隙を塞ぐように配置されている。
【0027】
次に、本実施形態の特徴部である現像液回収部材3について詳しく説明する。現像液回収部材3は、クリーニングブレード2の先端肉厚面2aと感光体1とが形成する空間に配置される先端部3aと、クリーニングブレード背面2bと間隙をもって対向する腹面3bとを備えたフィルム状の部材である。この先端部3aはクリーニングブレード2の先端肉厚面2aとほぼ平行になるよう曲折している。また、腹面3bに、クリーニングブレード背面2b先端エッジと接触する複数のリブ3cを設けている。このような構成の現像液回収部材3は、ブロー成形等によって製作される。
【0028】
次に、上記構成のクリーニング装置16が、感光体1上の残留現像液を除去する動作について説明する。
このクリーニング装置16では、感光体1上の残留現像液は、クリーニンングブレード2の先端肉厚面2aにより堰き止められ、上向きのクリーニングブレード2の先端肉厚面2aと感光体1とが形成する空間に液溜まり7となる。
図3は、感光体1停止時の液溜まり7の状態説明図である。感光体1の停止時には、液溜まり7の現像液は凹面状のメニスカスを形成する。ここで、本実施形態の特徴部である現像液回収部材3の、クリーニングブレード2の先端肉厚面2aと感光体1とが形成する空間に配置される先端部3aが、凹面状のメニスカスを形成している液溜まり7の液面に接触して現像液を補足し、現像液は表面張力により現像液回収部材3の先端部3aと接触した部分が凸になるメニスカスを形成する。また、液溜まり7の現像液は現像液回収部材3の先端部3aに捕捉されることにより移動しにくくなる。このため、感光体1の停止時に液溜まり7の現像液がクリーニングブレード2の稜線方向へ移動しにくくなり、クリーニングブレード2側端から現像液が流出する虞は少なくなる。
【0029】
また、図4は、感光体1回転時の液溜まり7の状態説明図である。感光体1の回転時には、液溜まり7の現像液は凸面状のメニスカスを形成して盛り上がると共に、感光体1の回転方向上流側から搬送される新たな残留現像液に押し出されることにより、クリーニングブレード肉厚面2aを乗り越えてクリーニングブレード背面2b上に移動する。さらに、クリーニングブレード背面2bと現像液回収部材の腹面3bとが形成する空間において、現像液回収部材3の先端部3aに補足されている液溜まり7の現像液はその表面張力によって、矢印bにしめすように、現像液回収部材の先端部3aから腹面3bおよび腹面3bに設けられたリブ3cを伝って、現像液回収部材3の後端へ向かって移動する。このような現像液回収部材3を伝う現像液の動きが、感光体1上からの現像液の移動を促進する。このため、クリーニングブレードのみのクリーニング装置に比較して、より速やかに感光体1上から現像液を除去することができ、液リングが発生する虞は少なくなる。
【0030】
上記クリーニング装置16においては、現像液回収部材は先端部3aから腹面3bおよび腹面3bに設けられたリブ3cを伝って、現像液回収部材3の後端へ向かって移動する。ここで、リブ3cがなくとも、現像液回収部材3は先端部3aから腹面3bを伝って、現像液回収部材3の後端へ向かって移動させることはできる。しかし、リブ3cを設けることにより、現像液が伝うことのできる面積を広くなり、多量の現像液を伝わせることができる。このため、感光体1上からの現像液の移動は速くなる。
ところで、クリーニングブレード背面2bと現像液回収部材の腹面3bとが形成する間隙において、表面張力により現像液回収部材3の先端部3aから腹面3bを伝って後端部に向かって移動する現像液の動きは、クリーニングブレード背面2bと現像液回収部材3の腹面3bとが形成する間隙が狭すぎると移動できる現像液の量が少なくなり、感光体1上からの現像液の移動は速やかに行えない。遅くなる。しかしながら、本実施形態では、リブ3cにより、腹面3bとクリーニングブレード背面2bとは適当な間隙が保たれているので、間隙が狭すぎて感光体1上からの移動が速やかに行えなくなる虞もない。これらのことにより、現像液回収部材3の腹面3bに設けられたリブ3cを伝う現像液の動きが加わることで、さらに速やかに液溜まりの現像液を感光体1上から除去することができる

【0031】
このように、クリーニング装置16においてはクリーニングブレード2端部から現像液は流出する以前に、速やかに感光体1上から残留現像液を除去することができるようになり、流出する現像液に起因する液リングの発生を抑制することができる。
【0032】
ここで、上記クリーニング装置16においては、現像液回収部材3の先端部3aはクリーニングブレード2の先端肉厚面2aとほぼ平行になるよう曲折している。これは、現像液回収部材3の先端部3aを平坦な形状にしたものに較べ、先端部3aの位置と腹面3bの位置とを独立して変化させることができる。このため、容易に、先端部3aをクリーニングブレード2の先端肉厚面2aと感光体1とが形成する空間に配置し、確実に液溜まりの現像液を捕捉することができる。とともに、現像液回収部材3の腹面3bをクリーニングブレード背面2bと適当な間隙をもって配置することができる。そこで、感光体1上から現像液回収部材3の先端部3aから腹面3bを伝って後端に向かう現像液の移動を効果的に促進することができる。
【0033】
また、上記クリーニング装置16では、現像液回収部材3のリブ3cは、クリーニングブレード背面2b先端エッジと接触するよう配置されている。そこで、リブ3cは、クリーニングブレード背面2b先端と現像液回収部材3との間隙を一定に保つ機能を果たす。このため、別途間隙を保持するための手段を設けることなく、簡易な構成で、適当な間隙を維持することができる。そこで、リブ3cの高さ適当なものにすることで、クリーニングブレード背面2b先端と現像液回収部材3との間隙を適当なものに保ち、現像液回収部材3先端部3aから現像液回収部材の腹面3bまたはリブ3cを伝って後端に向かう現像液の移動を効果的に促進することができる。
【0034】
ところで、上記現像液回収部材3を設けると、感光体1回転時に、感光体1上の液溜まりの現像液の一部は現像液回収部材3の背面へも移動してしまう。現像液回収部材3の背面へ移動した現像液は、該背面上を流下するが、この時、背面を伝って不必要な領域に進入して機内汚れ、多色機における混色等を引き起こすおそれがある。
【0035】
そこで、図5に示すように、現像液回収部材3に開口10を設け、現像液回収部材3の背面上の現像液を、現像液回収部材3の腹面3b及び対向するクリーニングブレード背面2b上に移動させ、現像液回収部材3の腹面3bおよびクリーニングブレード背面2bを流下させる。ここで、開口10は切り起こし形状でも良い。この場合、現像液は現像液回収部材3の切り起こし形状の両面を伝ってクリーニングブレード背面2bへ滴下する。このようにして、現像液回収部材3の背面を伝って不必要な領域へ現像液が回り込み、機内汚れ、多色機における混色等が発生することを防止する。
【0036】
次に、感光体1上から除去された現像液の流れについて説明する。
感光体1の回転時に、クリーニングブレード背面2bと現像液回収部材の腹面3bとが形成する間隙において、現像液回収部材3の先端部3aから腹面3bやリブ3cを伝って後端部に向かって移動する現像液(図4中矢印b)は、後端に移動するに従い、重力により、クリーニングブレード背面2bに流下したり(図4中矢印C)、そのままの腹面3bやリブ3cを伝って流下する(図4中矢印D)。
【0037】
ここで、上記リブ3cがクリーニングブレード背面2b上を流れる現像液の流下方向下流に向かって真っ直ぐに配置されている場合を考える。この場合、上記現像液は、現像液回収部材3の先端部3aから後端部に向かってほぼ真っ直ぐに移動し、クリーニングブレード2の根本部において、クリーニングブレード背面2bと現像液回収部材3との間隙を塞ぐよう配置されたホルダ支持加圧部材6に堰き止められ、ホルダ支持加圧部材6上に滞留する。滞留した現像液は、時間が経つにつれ、ホルダ支持加圧部材6上を稜線方向に移動してその側端から鉛直下方に落下し回収される。ところが、現像液がホルダ支持加圧部材6上を側端に移動するまで時間を要してしまうと、ホルダ支持加圧部材6上に滞留する現像液の量が多くなり、現像液回収部材3の腹面3b、リブ3cまたはクリーニングブレード背面2b上にも現像液が滞留しまう。現像液回収部材3の腹面3b、リブ3cまたはクリーニングブレード背面2b上にも現像液が滞留すると、現像液回収部材3の先端部3aに捕捉された現像液が表面張力により現像液回収部材3の先端部3aから腹面3bまたはリブ3cを伝って後端部に向かって移動する現像液の動きを停滞させてしまう。
【0038】
そこで、本実施形態では、図6にしめすように、現像液回収部材3のリブ3cを、現像液回収部材3の後端にいくに従い側端に向かうよう斜めなハの字状に配置した。このハの字状のリブ3cは、クリーニングブレード背面2bと現像液回収部材3の腹面3bとが形成する間隙において、現像液回収部材3の腹面3bまたはリブ3cを伝って後端部に向かって移動する現像液を、現像液回収部材3の後端に移動するに従い側端に向かって斜めに移動するよう誘導する。現像液は現像液回収部材2の側端に向かって誘導され該側端より落下したり、クリーニングブレード2の根本部において、クリーニングブレード背面2bと現像液回収部材3との間隙を塞ぐよう配置されたホルダ支持加圧部材6の側端近傍に誘導されホルダ支持加圧部材6の側端から落下する。このように、現像液回収部材3の腹面3bまたはリブ3cを伝って後端部に向かって移動する現像液が、ホルダ支持加圧部材6の中央部に向かわず、ホルダ支持加圧部材6の側端近傍に向かうよう誘導する。これにより、該現像液がホルダ支持加圧部材6上を側端に移動するまで時間を短くし、ホルダ支持加圧部材6上に滞留する現像液の量を減少させることができる。また、現像液を現像液回収部材3の側端に誘導し、積極的に現像液回収部材3の該側端より落下させることができるので、ホルダ支持加圧部材6上に滞留する現像液の量を減少させることができる。これらにより、現像液回収部材3の腹面3b、リブ3cまたはクリーニングブレード背面2b上にも現像液が滞留することを防止する。このため、現像液回収部材3の腹面3b、リブ3cまたはクリーニングブレード背面2b上に滞留することを防ぎ、クリーニングブレード背面2bと現像液回収部材3の腹面3bとが形成する間隙において、液溜まりの現像液が表面張力により現像液回収部材3の先端部3aから腹面3bを伝って後端部に向かって移動する現像液の動きを停滞させることを防止する。
【0039】
さらに、本実施形態では、ホルダ支持加圧部材6上に現像液搬送部材4を設け、現像液の滞留を防止している。以下、図7、図8に基づき詳しく説明する。
図7は、ホルダ支持加圧部材6上に現像液搬送部材4を取り付ける説明のための斜視図、図8は、ホルダ支持加圧部材6上に現像液搬送部材4を取り付けた状態をしめす斜視図である。図7、図8に示すように、クリーニングブレード背面2bの根本部のホルダ支持加圧部材6上に、ホルダ支持加圧部材6の側端に向かって傾斜した傾斜面を有する現像液搬送部材4を、クリーニングブレード背面2bと現像液回収部材3との間隙を塞ぐように配置している。このような構成の現像液搬送部材4は切削やプレスなどの方法で製作される。
【0040】
感光体1の回転時に、クリーニングブレード肉厚面2aを乗り越えてクリーニングブレード背面2b上に移動した現像液はクリーニングブレード背面2b上を根本部に向かって流下し、クリーニングブレード背面2bと現像液回収部材3との間隙を塞ぐように設けられた現像液搬送部材4に達する。また、クリーニングブレード背面2bと現像液回収部材の腹面3bとが形成する間隙において、現像液回収部材3の先端部3aから腹面3bやリブ3cを伝って後端部に向かって移動する現像液(図4中矢印b)の一部は、重力により、クリーニングブレード背面2bに流下する(図4中矢印C)。そして、クリーニングブレード背面2b上を、ブレードホルダ5とホルダ支持加圧部材6が配設されている根本部に向かって流下し、クリーニングブレード背面2bと現像液回収部材3との間隙を塞ぐように設けられた現像液搬送部材4に達する。また、クリーニングブレード背面2bと現像液回収部材3の腹面3bとが形成する間隙において、現像液回収部材3の腹面3bまたはリブ3cを伝ってそのまま後端部に移動した現像液(図4中矢印D)も、クリーニングブレード背面2bと現像液回収部材3との間隙を塞ぐように設けられた現像液搬送部材4に達する。このように、現像液搬送部材4に達した現像液は、現像液搬送部材4の傾斜面上をホルダ支持加圧部材6の側端へ向かって斜めに流下する。そして、ホルダ支持加圧部材6の側端より鉛直方向下方に落下する。このため、ホルダ支持加圧部材6がクリーニングブレード2根本部において、クリーニングブレード背面2bから突出し、現像液回収部材3との間隙を塞ぐよう配置されていても、現像液がホルダ支持加圧部材6に堰き止められて滞留することを防止できる。これにより、感光体1上の現像液の移動が停滞することを防止できる。
【0041】
また、現像液は、現像液搬送部材4の傾斜面を流下して側端に近づくにつれ増えていく。そこで、図9に示すように、現像液回収部材4の傾斜面の傾斜を、始点と終点の勾配に変化を設けた捻れた面にすることで、より傾斜面での流下を促進することもできる。
【0042】
さらに、現像液搬送部材4の傾斜面に表面処理を行い、現像液反撥性を有するようにすることで、現像液の搬送速度を速めることができる。現像液が油性の場合、表面処理としては、熱硬化型フッソ系樹脂(商品名X−70−029B(信越化学工業(株)製))などをコーティングする方法が挙げられる。このような表面処理をおこなうと、現像液と傾斜面との付着力を弱め、現像液が現像液搬送部材4の傾斜面上に滞留することなく、さらに速やかにクリーニングブレード端部へ流下することができる。特に装置の小型化のため、現像液搬送部材4の傾斜面の傾斜を大きくすることができない場合には、有効である。
【0043】
また、図10に示すように、上記現像液搬送部材4をブレードホルダ5と一体に構してもよい。現像液搬送部材4を一体とすることで、ブレードホルダ5の剛性と質量を大きくなり、クリーニングブレード2のビビリをおさえることができる。このため、安定したクリーニング動作をおこなうことができる。
【0044】
また、図11にしめすように、上記現像液搬送部材4を、上記ホルダ支持加圧部材6と一体に構成してもよい。現像液搬送部材4を一体とすることで、ホルダ支持加圧部材6の剛性が大きくなり、加圧時のクリーニングブレード2のたわみを小さくすることができる。このため、クリーニングブレード2の感光体1への当接状態が安定化し、安定したクリーニング動作をおこなうことができる。また、同一剛性を得るための、ホルダ支持加圧部材6の端部の大きさを小さくできる。よって、装置の小型化が可能になる。
【0045】
以上述べたように、本実施形態の湿式電子写真複写機では、簡易な構成のクリーニング装置16で、液リングの発生を抑えることができる。このため、簡易で小型な湿式電子写真装置で、かぶりや機内の汚れ、多色機における混色等のないを高画質な画像を得ることができる。また、クリーニングブレード2の長さを長くすることがないので、装置を小型にできる。また、クリーニングブレード2と感光体1との当接位置に関して、設計の自由度も大きいというメリットもある。
【0046】
【発明の効果】
請求項1乃至7の発明によれば、クリーニングブレードによる液リングの発生を抑え、かぶりや機内の汚れ、多色機における混色等を防止できる簡易で小型な湿式画像形成装置およびこれに採用されるクリーニング装置を提供することができる。
特に、請求項2乃至5の発明によれば、さらに速やかに現像液を像担持体上から除去することができ、液リングが発生する虞をがさらに少なくできるという優れた効果がある。
【0047】
特に、請求項2の発明によれば、現像液回収部材背面を伝って不必要な領域へ現像液が回り込み、機内汚れ、多色機における混色等が発生することを防止できるという優れた効果がある。
【0049】
特に、請求項の発明によれば、別途部材を設けることなく、容易な構成で、像担持体上からクリーニングブレード背面上への現像液の移動を促進できるという優れた効果がある。
【0050】
特に、請求項の発明によれば、クリーニングブレード背面と現像液回収部材の腹面とが形成する間隙において、像担持体上の液溜まりの現像液が表面張力により現像液回収部材の先端部から腹面を伝って後端部に向かって移動する現像液の動きが停滞することを防止できるという優れた効果がある。
【0051】
特に、請求項5あるいは6の発明によれば、現像液が像担持体上から移動する動きが停滞することを防止できるという優れた効果がある。
【図面の簡単な説明】
【図1】本実施形態に係る湿式電子写真複写機の概略構成図。
【図2】本実施形態の湿式電子写真複写機に採用されるクリーニング装置の概略構成をしめす断面図。
【図3】感光体停止時の液溜まりの状態説明図。
【図4】感光体回転時の液溜まりの状態説明図。
【図5】現像液回収部材の開口をしめす斜視図。
【図6】クリーニング装置の概略構成をしめす上面図。
【図7】現像液搬送部材を取り付ける説明の斜視図。
【図8】現像液搬送部材を取り付けた状態をしめす斜視図。
【図9】現像液搬送部材の形状をあらわす斜視図。
【図10】現像液搬送部材をブレードホルダと一体に構成したものの斜視図。
【図11】現像液搬送部材をホルダ支持加圧部材と一体に構成したものの斜視図。
【図12】従来のクリーニング装置の概略構成をしめす斜視図。
【図13】従来のクリーニング装置の概略構成をしめす断面図。
【符号の説明】
1 感光体
2 クリーニングブレード
2a 先端肉厚面
2b 背面
3 現像液回収部材
3a 現像液回収部材先端部
3b 現像液回収部材腹面
3c リブ
4 現像液搬送部材
5 ブレードホルダ
6 ホルダ支持加圧部材
7 液溜まり
8 クリーニングブレードと感光体とが形成する空間
9 液リング
10 開口
11 クリーニングブレード背面上の液溜まり
12 帯電装置
13 露光装置
14 湿式現像装置
15 転写装置
16 クリーニング装置
17 給紙トレイ
18 給紙搬送装置
19 定着装置
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wet image forming apparatus applied to a copying machine, a facsimile machine, a printer, and the like, and a cleaning apparatus employed therein.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a cleaning apparatus employed in a wet image forming apparatus, an apparatus that removes a residual developer on an image carrier using a cleaning blade in contact with the surface of the image carrier is known. FIG. 13 is a cross-sectional view showing a schematic configuration of a typical one. In the cleaning device shown in FIG. 13, the tip edge of the cleaning blade 2 is arranged in contact with the photosensitive member 1 in the first quadrant of the photosensitive member 1 as the image carrier rotating in the clockwise direction. The tip thick surface 2a of the blade 2 faces upward. The cleaning blade 2 is attached to a holder supporting pressure member 6 that pressurizes the cleaning blade 2 via a cleaning blade holder 5 that supports the cleaning blade 2 at the base portion of the back surface 2b. In this cleaning apparatus, the residual developer on the photosensitive member 1 is blocked by the tip thick surface 2 a of the cleaning blade 2, and the liquid is put in the space formed by the tip thick surface 2 a of the cleaning blade 2 and the photosensitive member 1. A reservoir 7 is formed. The developer in the liquid reservoir 7 tends to move downstream in the rotation direction of the photoconductor 1 as the photoconductor 1 rotates. However, since the developer is blocked by the thick tip surface 2a of the cleaning blade 2, it moves over the thick tip surface 2a of the cleaning blade 2 and moves onto the cleaning blade back surface 2b. By such an operation, the residual developer on the photoreceptor 1 is removed.
[0003]
In such a cleaning device, the developer in the liquid reservoir 7 also moves in the ridge line direction of the cleaning blade 2. If the developer moves in the direction of the ridgeline of the cleaning blade 2 and reaches the side edge before the developer moves onto the cleaning blade back surface 2b, the developer flows out from the side edge of the cleaning blade 2 and is referred to as a liquid ring 9. In other words, a phenomenon occurs in which an annular developer adheres to the photoreceptor 1 (see FIG. 12). The liquid ring 9 has an annular shape while the photosensitive member 1 is rotating, but moves to the lower end of the photosensitive member 1 when the photosensitive member 1 is stopped, resulting in liquid dripping. In addition, a wedge-shaped narrow space 8 formed by the cleaning blade 2 and the photosensitive member 1 acts as a capillary tube for the developer in the liquid ring 9, and the developer may wrap around the space 8. These cause fogging, dirt in the machine, and color mixing in a multicolor machine.
[0004]
As described above, the liquid ring 9 has the tip thick surface 2a of the cleaning blade 2 facing upward, and is blocked by the tip thick surface 2a of the cleaning blade 2, and the developer is exposed to the tip thick surface 2a of the cleaning blade. Occurs when the liquid pool 7 is formed in the space formed by the body 1, specifically when the cleaning blade 2 comes into contact with or in the vicinity of the first or fourth quadrant of the photoreceptor 1 rotating in the clockwise direction. To do. The generation of the liquid ring 9 can be suppressed to some extent if the contact position between the cleaning blade 2 and the photosensitive member 1 is devised. However, there is a demerit that design freedom is reduced.
[0005]
Japanese Patent Application Laid-Open No. 08-030157 discloses a cleaning device having a cleaning blade for discharging residual developer from the side of an effective image forming area of a photosensitive drum, and a recovery path for receiving the discharged residual developer. A cleaning device has been proposed in which the recovery path includes the end face of the photosensitive drum. However, in the cleaning device described in the above publication, the device becomes large. Furthermore, an apparatus having a recovery path has a complicated configuration.
[0006]
By the way, in the cleaning device that removes the residual developer on the image carrier by the cleaning blade brought into contact with the surface of the image carrier, in order to avoid chatter of the cleaning blade and perform a stable cleaning operation, FIG. In general, the holder supporting pressure member 6 serving as the center of oscillation of the cleaning blade 2 is disposed at the base of the cleaning blade 2 so as to protrude from the back surface 2b. In this cleaning device, the developer that has moved onto the cleaning blade back surface 2 b flows down on the back surface 2 b toward the root of the cleaning blade 2 that is vertically downward according to gravity. Then, at the root part of the cleaning blade 2, it is dammed up by the holder support pressure member 6 disposed so as to protrude from the back surface 2 b, and stays on the cleaning blade back surface 2 b and the holder support pressure member 6. As time passes, the staying developer 11 moves in the direction of the ridgeline of the cleaning blade 2 and falls from the side edge of the cleaning blade 2 or over the holder pressurizing member 6 and falls vertically downward. It is collected in a developer collecting unit (not shown) provided.
[0007]
However, when the amount of the developing solution 11 staying on the cleaning blade back surface 2b increases, the staying developing solution 11 is transferred to the cleaning blade back surface 2b by the rotation of the photoconductor 1. The movement that tries to move to is stagnated. If the movement of the developing solution on the photosensitive member 1 on the cleaning blade back surface 2b is stagnant and it takes time until the developing solution moves on the cleaning blade back surface 2b, the development of the liquid reservoir 7 on the photosensitive member 1 is performed during this time. The liquid tends to move in the direction of the ridgeline of the cleaning blade 2, and the liquid ring 9 is likely to occur.
[0008]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION In view of the above-described problems, the present invention aims to reduce the generation of a liquid ring by a cleaning blade, and to prevent fogging, in-machine contamination, color mixing in a multi-color machine, and the like. And a cleaning device employed in the same.
[0009]
[Means for Solving the Problems]
  In order to achieve the above object, according to the first aspect of the present invention, the leading edge is brought into contact with the surface of the image carrier so that the thick surface of the tip of the cleaning blade faces upward, and the residual on the image carrier by the cleaning blade. In the cleaning apparatus for removing the developer, the cleaning blade includes a tip portion disposed in a space formed by the tip thick surface of the cleaning blade and the image carrier, and a surface facing the back surface of the cleaning blade with a gap. Has a developer recovery memberAnd a plurality of ribs are provided on the surface of the developer recovery member facing the rear surface of the cleaning blade.It is characterized by this.
[0010]
  In the cleaning device according to claim 1, the tip of the developer recovery member captures the developer in a liquid pool formed in a space formed by the image carrier and the tip thick surface of the cleaning blade. This prevents the cleaning blade from moving in the ridge line direction. Further, the developer in the liquid pool moves onto the rear surface of the cleaning blade by being pushed out by new residual developer conveyed from the upstream side in the rotation direction of the image carrier. Further, in the gap formed by the back surface of the cleaning blade and the back surface of the cleaning blade of the developer collecting member facing the back surface of the cleaning blade (hereinafter referred to as the abdominal surface), the developer in the liquid pool is abdominal surface from the tip of the developer collecting member. And move toward the rear end. Due to such movement of the developing solution, the developing solution in the liquid pool is quickly removed from the image carrier. This will be described in detail below.
  The residual developer on the image carrier is blocked by the thick surface of the cleaning blade, and forms a liquid pool in the space formed by the thick surface of the cleaning blade and the image carrier.
  When the image carrier is stopped, the developer in the liquid pool forms a concave meniscus. Here, the tip of the developer recovery member disposed in the space formed by the thick surface of the cleaning blade and the image carrier is in contact with the liquid surface of the liquid reservoir forming the concave meniscus. Capture developer. The developer forms a meniscus in which the portion captured by the surface tension is convex. Further, the developer in the liquid pool becomes difficult to move by being captured by the tip of the developer recovery member. For this reason, when the image carrier is stopped, the developer in the liquid pool is difficult to move in the ridge line direction of the cleaning blade.
  Further, when the image carrier rotates, the developer in the liquid pool forms a convex meniscus and rises, and is pushed out by a new residual developer conveyed from the upstream side in the rotation direction of the image carrier. It moves over the thick wall surface of the cleaning blade and moves onto the back surface of the cleaning blade. Further, the developer in the liquid pool trapped at the tip of the developer recovery member is, due to the surface tension, the tip of the developer recovery member in the gap formed by the back surface of the cleaning blade and the belly surface of the developer recovery member. Move along the abdominal surface toward the rear end. By adding the movement of the developer by such a developer recovery member, the developer in the liquid reservoir can be quickly removed from the image carrier.
  As described above, the cleaning device according to the present invention makes it difficult to move the liquid developer in the ridge line direction of the cleaning blade as compared with the cleaning device having only the cleaning blade, and promptly develop the residual developer from the image carrier. The liquid can be removed. For this reason, the cleaning device of the present invention can reduce the possibility of the occurrence of a liquid ring with a simple configuration, and can prevent fogging, in-machine contamination, color mixing in a multicolor machine, and the like. Further, since the length of the cleaning blade is not increased, the apparatus can be miniaturized. In addition, there is also an advantage that the degree of freedom in design is large with respect to the contact position between the cleaning blade and the image carrier.
Then, by providing a plurality of ribs on the surface of the developer recovery member that faces the back surface of the cleaning blade, the following effects can be obtained.
That is, the developer trapped at the tip of the developer collecting member is separated from the tip of the developer collecting member by the surface tension in the gap formed by the back surface of the cleaning blade and the belly surface of the developer collecting member. It moves toward the rear end portion along a plurality of ribs provided on the abdominal surface. Thus, since the developing solution propagates through the plurality of ribs provided on the abdominal surface, the area where the developing solution propagates becomes wide. For this reason, the developer collecting member can transmit a large amount of developer, and the movement of the developer from the image carrier is accelerated.
In the gap formed by the rear surface of the cleaning blade and the abdomen surface of the developer recovery member, the movement of the developer moving from the front end portion of the developer recovery member to the rear end portion through the abdominal surface due to surface tension is If the gap formed by the abdominal surface of the developer recovery member is too narrow, the amount of developer that can move is reduced. The developer cannot be moved quickly from the image carrier. However, in the present invention, an appropriate gap is maintained between the rear surface of the cleaning blade and the abdominal surface of the developer recovery member by the rib provided on the abdominal surface. Therefore, there is no possibility that the developer cannot be moved quickly.
As described above, the movement of the developer passing through the rib provided on the abdominal surface of the developer recovery member is added, so that the developer in the liquid reservoir can be removed from the image carrier more quickly.
[0011]
By the way, when the developer collecting member is provided, a part of the developer in the liquid pool on the image carrier also moves to a surface opposite to the abdominal surface of the developer collecting member (hereinafter referred to as the back surface). The developer that has moved to the back surface of the developer recovery member may enter an unnecessary area through the back surface of the developer recovery member and cause in-machine contamination, color mixing in a multicolor machine, or the like.
[0012]
Accordingly, the invention of claim 2 is characterized in that, in the cleaning device of claim 1, an opening is provided in the developer recovery member.
[0013]
According to another aspect of the cleaning device of the present invention, the developer on the back surface of the developer recovery member moves from the opening provided in the developer recovery member to the abdominal surface of the developer recovery member and the back surface of the opposing cleaning blade. It flows down on the abdominal surface of the member and the back surface of the opposing cleaning blade. This prevents the developing solution from flowing into the unnecessary area along the back surface of the developing solution collecting member, thereby preventing internal contamination, color mixing in a multicolor machine, and the like.
[0016]
  Claim3The invention of claim1 or 2In this cleaning apparatus, the rib of the developer recovery member is disposed so as to come into contact with the rear end of the cleaning blade.
[0017]
  Claim3In this cleaning device, the rib is disposed so as to contact the front end of the cleaning blade, so that the rib functions to maintain a constant gap between the front end of the cleaning blade and the back of the developer recovery member. Thus, the gap between the rear surface of the cleaning blade and the abdominal surface of the developer recovery member can be easily maintained at a certain appropriate value without providing a separate means for holding the gap. Therefore, the gap between the rear surface of the cleaning blade and the abdomen surface of the developer collecting member is too narrow so that the developer cannot be quickly moved from the image carrier, and the developer is quickly removed from the image carrier. can do.
[0018]
  Claim4The invention of claim1, 2Or3In this cleaning device, a blade supporting pressure member for supporting and pressing the cleaning blade is disposed at the base of the cleaning blade so as to close a gap between the rear surface of the cleaning blade and the developer collecting member, and the developer collecting member The ribs are arranged obliquely toward the side end as it goes to the rear end of the developer recovery member.
[0019]
  Claim4In this cleaning device, the rib of the developer collecting member moves toward the rear end portion along the belly surface or rib of the developer collecting member in the gap formed by the rear surface of the cleaning blade and the belly surface of the developer collecting member. The developer is guided to move obliquely toward the side end as it moves to the rear end of the developer collecting member.
  As a comparative example, consider the case where the rib is arranged straight toward the rear end of the developer recovery member. In this case, the developer moves almost straight from the front end to the rear end of the developer recovery member, and is arranged so as to close the gap between the rear surface of the cleaning blade and the developer recovery member at the base of the cleaning blade. The blade supporting pressure member is retained and retained. As time passes, the staying developer moves in the direction of the ridgeline on the blade supporting pressure member, and drops and recovers vertically from the side end thereof. However, if it takes time for the developer to move to the side end on the blade support pressure member, the amount of the developer staying on the blade support pressure member increases, The developer stays on the ribs or the back of the cleaning blade. When the developer stays on the abdomen, rib or back of the cleaning blade of the developer collecting member, the developer trapped at the tip of the developer collecting member moves from the tip of the developer collecting member to the abdomen or rib by the surface tension. Accordingly, the movement of the developer moving toward the rear end portion is stagnated.
  Therefore, in the present invention, in the gap formed by the cleaning blade back surface and the abdominal surface of the developer recovery member, the developer that moves toward the rear end portion along the abdominal surface or rib of the developer recovery member is supplied to the developer recovery member. As it moves to the rear end, it is guided to move obliquely toward the side end. Blade support arranged so that the developer is guided toward the side edge of the developer recovery member and falls from the side end or closes the gap between the rear surface of the cleaning blade and the developer recovery member at the root of the cleaning blade It is guided in the vicinity of the side end of the pressure member and quickly falls from the side end of the blade support pressure member. By creating such a developer flow, the amount of developer staying on the blade supporting pressure member is reduced, and the developer stays on the belly surface, rib or back of the cleaning blade of the developer collecting member. To prevent. Therefore, in the gap formed by the rear surface of the cleaning blade and the abdomen surface of the developer recovery member, the developing solution in the liquid pool moves from the front end part of the developer recovery member to the rear end part through the abdomen surface due to surface tension. It is possible to prevent the liquid movement from stagnating.
[0020]
  Claim5The invention of claim 1, 2, 3Or 4In the cleaning device of the above,Support and press the cleaning bladeWhen the blade supporting pressure member is arranged at the root of the cleaning blade so as to close the gap between the cleaning blade back surface and the developer recovery member.BothIn addition, a developer conveying member having an inclined surface inclined toward the side end of the blade supporting pressure member is disposed on the blade supporting pressure member.
  The invention of claim 6In a cleaning apparatus in which a tip edge is brought into contact with the surface of an image carrier so that the tip wall surface of the cleaning blade faces upward, and the residual developer on the image carrier is removed by the cleaning blade, the tip of the cleaning blade is A developer recovery member having a tip portion disposed in a space formed by the thick surface and the image carrier, and a surface facing the back surface of the cleaning blade with a gap, and supporting and pressurizing the cleaning blade; The blade supporting pressure member is disposed at the base of the cleaning blade so as to close the gap between the rear surface of the cleaning blade and the developer recovery member, and has an inclined surface inclined toward the side end of the blade supporting pressure member. The developer conveying member is disposed on the blade supporting pressure member.
[0021]
  theseIn this cleaning device, when the image carrier rotates, the developer that has moved over the thick wall surface of the cleaning blade and moved onto the back surface of the cleaning blade flows down on the back surface of the cleaning blade from the tip portion toward the root portion. Then, the developer reaches the developer conveying member provided so as to close the gap between the rear surface of the cleaning blade and the developer collecting member. In addition, when the image carrier rotates, one of the developer moving toward the rear end portion along the stomach surface or rib of the developer recovery member in the gap formed by the rear surface of the cleaning blade and the stomach surface of the developer recovery member. The developer drops on the back surface of the cleaning blade by gravity, flows down on the back surface of the cleaning blade toward the root portion, and is provided so as to close the gap between the back surface of the cleaning blade and the developer recovery member. To reach. Further, in the gap formed by the rear surface of the cleaning blade and the abdominal surface of the developer recovery member, the developer that has moved to the rear end portion directly through the abdominal surface or rib of the developer recovery member is also The developer conveying member provided so as to close the gap is reached. In this manner, the developer that has reached the developer transport member flows obliquely on the inclined surface of the developer transport member toward the side end of the blade support pressure member. Then, it falls downward in the vertical direction from the side end of the blade supporting pressure member. For this reason, even if the blade supporting pressure member protrudes from the rear surface of the cleaning blade at the root of the cleaning blade and is arranged to close the gap with the developer collecting member, the developer is blocked by the blade supporting pressure member. It can prevent staying. Thereby, it is possible to prevent the movement of the developer on the image carrier from stagnating.
[0022]
According to a seventh aspect of the present invention, there is provided an image carrier that carries an electrostatic latent image, a wet developing device that visualizes the electrostatic latent image on the image carrier using a developing solution, and an image on the image carrier. A wet image forming apparatus comprising a cleaning device that removes a residual developer from an image bearing member after transferring a visible image to a transfer target, wherein the cleaning device is any one of claims 1, 2, 3, 4, 5 Alternatively, the cleaning device 6 is used.
[0023]
In the wet image forming apparatus according to the seventh aspect, it is possible to suppress the occurrence of the liquid ring by the cleaning blade with a small and simple means. Therefore, a high-quality image can be obtained with a simple and small wet electrophotographic apparatus without fogging, in-machine contamination, color mixing in a multicolor machine, and the like.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is applied to a wet electrophotographic copying machine which is a wet image forming apparatus will be described.
FIG. 1 is a schematic configuration diagram of a main part of a wet electrophotographic copying machine according to the present embodiment. The wet electrophotographic copying machine shown in FIG. 1 irradiates an electrostatic latent image by irradiating the photosensitive member 1 with a charging device 12 for charging the surface of the photosensitive member 1 and a laser beam around the photosensitive member 1 as an image carrier. Exposure device 13 as a latent image forming means to be formed, wet developing device 14 for converting electrostatic latent image formed on photoconductor 1 into a toner image using a developer in which toner is dispersed in a carrier liquid, photoconductor 1 A transfer device 15 for transferring the toner image formed thereon onto a transfer sheet as a transfer member, a cleaning device 16 for removing residual developer remaining on the photosensitive member 1 after the transfer, and the like are sequentially provided. Further, a paper feeding / conveying device 18 for feeding the transfer paper from the paper feeding tray 17 and a fixing device 19 for fixing the toner to the transfer paper after the transfer paper on which the toner image has been transferred are separated from the photoreceptor 1 are provided. It has been.
[0025]
In the wet electrophotographic copying machine configured as described above, the surface of the photoreceptor 1 rotating in the direction of arrow a is uniformly charged by the charging device 12 and then irradiated with the laser beam of the exposure device 13 based on the image information. Then, a latent image is formed on the photoreceptor 1. The electrostatic latent image formed on the photoreceptor 1 is visualized by supplying a developing solution from the wet developing device 14. On the other hand, the transfer paper is fed from the paper feed tray 17 by the paper feeding / conveying device 18 and then conveyed to the transfer portion where the photosensitive member 1 and the transfer device 15 face each other. Then, the transfer device 15 applies a charge having a polarity opposite to that of the toner image on the photoconductor 1 to the transfer paper, thereby transferring the toner image formed on the photoconductor 1 to the transfer paper. Next, the transfer paper is separated from the photoconductor 1 and sent to the fixing device 19 to fix the toner on the transfer paper, thereby obtaining an image. On the other hand, the residual developer on the photoreceptor 1 is removed by a cleaning device 16 described in detail below.
[0026]
FIG. 2 is a cross-sectional view showing a schematic configuration of the cleaning device 16 employed in the wet electrophotographic copying machine of the present embodiment. The cleaning device 16 shown in FIG. 2 is a developer disposed in the first quadrant of the photosensitive member 1 rotating in the direction of arrow a so as to face the cleaning blade 2 as a cleaning member that contacts the surface of the photosensitive member 1 and the cleaning blade back surface 2b. A collection member 3 and a collection unit (not shown) are provided. The cleaning blade 2 is disposed so that the tip edge thereof is in contact with the surface of the photoreceptor 1 in the counter direction, and the tip thick surface 2 of the cleaning blade 2 faces upward. The cleaning blade 2 is bonded to a blade holder 5 as a cleaning blade support member at the root of the back surface 2b, and further to a holder support pressure member 6 as a blade support pressure member serving as a swing center through the blade holder 5. It is attached. The holder supporting pressure member 6 is disposed so as to close the gap between the cleaning blade back surface 2 b and the developer recovery member 3. 2 shows an example in which the blade holder 5 and the holder supporting pressure member 6 are separate members, but they may be integrated. Further, the developer transport member 4 having an inclined surface inclined toward the side end of the holder support pressurizing member 6 on the holder support pressurizing member 6 forms a gap between the cleaning blade back surface 2b and the developer recovering member 3. It is arranged to close.
[0027]
Next, the developer recovery member 3 that is a feature of the present embodiment will be described in detail. The developer collecting member 3 is a film having a tip portion 3a disposed in a space formed by the tip thick surface 2a of the cleaning blade 2 and the photosensitive member 1, and an abdominal surface 3b facing the cleaning blade back surface 2b with a gap. Shaped member. The tip 3 a is bent so as to be substantially parallel to the tip thick surface 2 a of the cleaning blade 2. The abdominal surface 3b is provided with a plurality of ribs 3c that come into contact with the leading edge of the cleaning blade back surface 2b. The developer recovery member 3 having such a configuration is manufactured by blow molding or the like.
[0028]
Next, an operation in which the cleaning device 16 having the above configuration removes the residual developer on the photoreceptor 1 will be described.
In this cleaning device 16, the residual developer on the photosensitive member 1 is blocked by the thick tip surface 2 a of the cleaning blade 2, and the thick tip surface 2 a of the upward cleaning blade 2 and the photosensitive member 1 are formed. A liquid pool 7 is formed in the space.
FIG. 3 is an explanatory diagram of the state of the liquid reservoir 7 when the photosensitive member 1 is stopped. When the photosensitive member 1 is stopped, the developer in the liquid reservoir 7 forms a concave meniscus. Here, the tip portion 3a of the developer recovery member 3 which is a characteristic portion of the present embodiment, which is disposed in the space formed by the tip thick surface 2a of the cleaning blade 2 and the photosensitive member 1, has a concave meniscus. The developer is captured by contacting the liquid surface of the liquid reservoir 7 formed, and the developer forms a meniscus having a convex portion in contact with the tip 3a of the developer recovery member 3 due to surface tension. Further, the developer in the liquid reservoir 7 becomes difficult to move by being captured by the tip 3 a of the developer recovery member 3. This makes it difficult for the developer in the liquid reservoir 7 to move in the ridge line direction of the cleaning blade 2 when the photosensitive member 1 is stopped, and the possibility of the developer flowing out from the end of the cleaning blade 2 is reduced.
[0029]
FIG. 4 is an explanatory diagram of the state of the liquid reservoir 7 when the photosensitive member 1 rotates. When the photosensitive member 1 rotates, the developer in the liquid reservoir 7 forms a convex meniscus and rises, and is pushed out by a new residual developer conveyed from the upstream side in the rotational direction of the photosensitive member 1, thereby cleaning blade. It moves over the thick surface 2a and moves onto the cleaning blade back surface 2b. Further, in the space formed by the cleaning blade back surface 2b and the abdomen surface 3b of the developer recovery member, the developer in the liquid reservoir 7 supplemented to the tip 3a of the developer recovery member 3 is changed to the arrow b by the surface tension. As shown, it moves toward the rear end of the developer collecting member 3 from the tip 3a of the developer collecting member through the abdominal surface 3b and the rib 3c provided on the abdominal surface 3b. The movement of the developer passing through the developer collecting member 3 promotes the movement of the developer from the photoreceptor 1. For this reason, the developer can be removed from the photoreceptor 1 more quickly as compared with a cleaning device having only a cleaning blade, and the possibility of a liquid ring being reduced.
[0030]
In the cleaning device 16, the developer recovery member moves toward the rear end of the developer recovery member 3 from the front end portion 3 a through the abdominal surface 3 b and the rib 3 c provided on the abdominal surface 3 b. Here, even without the rib 3 c, the developer recovery member 3 can be moved from the front end portion 3 a to the rear surface 3 b toward the rear end of the developer recovery member 3. However, by providing the rib 3c, the area through which the developer can be transmitted is widened, and a large amount of developer can be transmitted. For this reason, the movement of the developer from the photosensitive member 1 is accelerated.
By the way, in the gap formed by the cleaning blade back surface 2b and the abdomen surface 3b of the developer recovery member, the developer that moves from the front end 3a of the developer recovery member 3 to the rear end through the abdomen 3b due to surface tension. As for the movement, if the gap formed between the back surface 2b of the cleaning blade and the abdominal surface 3b of the developer collecting member 3 is too narrow, the amount of developer that can be moved decreases, and the developer cannot be moved quickly from the photoreceptor 1. . Become slow. However, in the present embodiment, an appropriate gap is maintained between the abdominal surface 3b and the cleaning blade back surface 2b by the rib 3c. Therefore, there is no possibility that the gap is too narrow to quickly move from the photoreceptor 1. . As a result, movement of the developer passing through the rib 3c provided on the abdominal surface 3b of the developer recovery member 3 is added, so that the developer in the liquid pool can be removed from the photoreceptor 1 more rapidly.
.
[0031]
As described above, in the cleaning device 16, before the developer flows out from the end of the cleaning blade 2, the residual developer can be quickly removed from the photoreceptor 1, which is caused by the flowing developer. Generation | occurrence | production of a liquid ring can be suppressed.
[0032]
Here, in the cleaning device 16, the tip 3 a of the developer recovery member 3 is bent so as to be substantially parallel to the tip thick surface 2 a of the cleaning blade 2. This can independently change the position of the tip portion 3a and the position of the abdominal surface 3b as compared with the developer recovery member 3 having a flat tip portion 3a. For this reason, the tip 3a can be easily disposed in the space formed by the tip thick surface 2a of the cleaning blade 2 and the photosensitive member 1, and the liquid developer can be reliably captured. At the same time, the abdomen surface 3b of the developer recovery member 3 can be disposed with an appropriate gap from the cleaning blade back surface 2b. Therefore, it is possible to effectively promote the movement of the developing solution from the top of the photosensitive member 1 to the rear end of the developing solution collecting member 3 from the front end portion 3a to the rear surface 3b.
[0033]
Further, in the cleaning device 16, the rib 3c of the developer recovery member 3 is disposed so as to contact the leading edge of the cleaning blade back surface 2b. Therefore, the rib 3c functions to keep the gap between the tip of the cleaning blade back surface 2b and the developer recovery member 3 constant. For this reason, an appropriate gap can be maintained with a simple configuration without providing a means for holding the gap separately. Accordingly, by setting the rib 3c to an appropriate height, the gap between the front end of the cleaning blade back surface 2b and the developer recovery member 3 can be kept appropriate, and the developer recovery member 3 can be removed from the developer recovery member 3 tip 3a. It is possible to effectively promote the movement of the developer toward the rear end along the abdominal surface 3b or the rib 3c.
[0034]
By the way, when the developer collecting member 3 is provided, a part of the developer in the liquid pool on the photoconductor 1 moves to the back of the developer collecting member 3 when the photoconductor 1 rotates. The developer that has moved to the back surface of the developer recovery member 3 flows down on the back surface, but at this time, it may enter the unnecessary area through the back surface, causing in-machine contamination, color mixing in a multicolor machine, and the like. is there.
[0035]
Therefore, as shown in FIG. 5, an opening 10 is provided in the developer collecting member 3 so that the developer on the back surface of the developer collecting member 3 is placed on the abdominal surface 3b of the developer collecting member 3 and the opposite cleaning blade back surface 2b. It is moved and the belly surface 3b and the cleaning blade back surface 2b of the developer collecting member 3 are caused to flow down. Here, the opening 10 may be cut and raised. In this case, the developer is dropped onto the cleaning blade back surface 2b along both sides of the cut and raised shape of the developer recovery member 3. In this way, it is possible to prevent the developing solution from flowing into the unnecessary area along the back surface of the developing solution collecting member 3 and causing contamination in the machine, color mixing in a multicolor machine, and the like.
[0036]
Next, the flow of the developer removed from the photoreceptor 1 will be described.
When the photosensitive member 1 rotates, a gap formed by the cleaning blade back surface 2b and the developer recovery member abdomen surface 3b travels from the front end 3a of the developer recovery member 3 to the rear end through the abdomen 3b and the rib 3c. As the developer moves (arrow b in FIG. 4) moves to the rear end, it flows down to the rear surface 2b of the cleaning blade due to gravity (arrow C in FIG. 4), or flows down the abdominal surface 3b or rib 3c as it is. (Arrow D in FIG. 4).
[0037]
Here, consider the case where the rib 3c is arranged straight downstream in the flow direction of the developer flowing on the cleaning blade back surface 2b. In this case, the developer moves substantially straight from the front end portion 3 a to the rear end portion of the developer recovery member 3, and at the root portion of the cleaning blade 2, the cleaning blade back surface 2 b and the developer recovery member 3 It is blocked by the holder support pressure member 6 arranged so as to close the gap, and stays on the holder support pressure member 6. As time passes, the staying developer moves in the direction of the ridgeline on the holder supporting pressure member 6 and drops from the side end vertically downward to be collected. However, if it takes time for the developer to move to the side end on the holder support pressure member 6, the amount of the developer staying on the holder support pressure member 6 increases, and the developer recovery member 3. The developer stays on the abdominal surface 3b, the rib 3c, or the cleaning blade back surface 2b. If the developer stays on the abdominal surface 3b, the rib 3c or the cleaning blade back surface 2b of the developer collecting member 3, the developer trapped at the tip 3a of the developer collecting member 3 is caused by the surface tension of the developer collecting member 3. The movement of the developer moving from the front end portion 3a toward the rear end portion through the abdominal surface 3b or the rib 3c is stagnated.
[0038]
Therefore, in the present embodiment, as shown in FIG. 6, the rib 3 c of the developer collecting member 3 is arranged in a slanted C shape so as to go to the side end toward the rear end of the developer collecting member 3. This C-shaped rib 3c is directed toward the rear end portion along the abdominal surface 3b or the rib 3c of the developer recovery member 3 in the gap formed by the cleaning blade back surface 2b and the abdominal surface 3b of the developer recovery member 3. The moving developer is guided to move obliquely toward the side end as it moves to the rear end of the developer collecting member 3. The developer is guided toward the side end of the developer recovery member 2 and dropped from the side end, or disposed at the root of the cleaning blade 2 so as to close the gap between the cleaning blade back surface 2 b and the developer recovery member 3. It is guided near the side end of the holder support pressure member 6 and falls from the side end of the holder support pressure member 6. In this way, the developer moving toward the rear end portion along the abdominal surface 3b or the rib 3c of the developer recovery member 3 does not move toward the center portion of the holder support pressurizing member 6, but the holder support pressurizing member 6 Guiding to the vicinity of the side edge. As a result, the time until the developer moves on the holder supporting pressure member 6 to the side end can be shortened, and the amount of the developer staying on the holder supporting pressure member 6 can be reduced. Further, since the developer can be guided to the side end of the developer recovery member 3 and actively dropped from the side end of the developer recovery member 3, the developer staying on the holder supporting pressure member 6 can be removed. The amount can be reduced. Thus, the developer is prevented from staying on the belly surface 3b, the rib 3c or the cleaning blade back surface 2b of the developer recovery member 3. This prevents the developer collecting member 3 from staying on the abdominal surface 3b, the rib 3c, or the cleaning blade back surface 2b, and prevents the liquid pool in the gap formed by the cleaning blade back surface 2b and the abdominal surface 3b of the developer collecting member 3. The developer is prevented from stagnation of the movement of the developer moving from the front end portion 3a of the developer recovery member 3 to the rear end portion by the surface tension toward the rear end portion.
[0039]
Furthermore, in the present embodiment, the developer transport member 4 is provided on the holder support pressure member 6 to prevent the developer from staying. This will be described in detail below with reference to FIGS.
FIG. 7 is a perspective view for explaining the mounting of the developer conveying member 4 on the holder supporting pressure member 6, and FIG. 8 is a perspective view showing the state where the developing solution conveying member 4 is mounted on the holder supporting pressure member 6. FIG. As shown in FIGS. 7 and 8, the developer transport member 4 having an inclined surface inclined toward the side end of the holder support pressure member 6 on the holder support pressure member 6 at the root of the cleaning blade back surface 2 b. Is arranged so as to close a gap between the cleaning blade back surface 2b and the developer recovery member 3. The developer transport member 4 having such a configuration is manufactured by a method such as cutting or pressing.
[0040]
When the photosensitive member 1 rotates, the developer that has moved over the cleaning blade thick surface 2a and moved onto the cleaning blade back surface 2b flows down on the cleaning blade back surface 2b toward the root, and the cleaning blade back surface 2b and the developer recovery member 3 reaches the developer conveying member 4 provided so as to close the gap with the developer 3. Further, in the gap formed by the cleaning blade back surface 2b and the abdomen surface 3b of the developer recovery member, the developer (from the front end 3a of the developer recovery member 3 to the rear end through the abdomen 3b and the ribs 3c) A part of arrow b) in FIG. 4 flows down to the cleaning blade back surface 2b by gravity (arrow C in FIG. 4). Then, it flows down on the cleaning blade back surface 2b toward the root portion where the blade holder 5 and the holder supporting pressure member 6 are disposed, and closes the gap between the cleaning blade back surface 2b and the developer recovery member 3. It reaches the developer conveying member 4 provided. Further, in the gap formed by the cleaning blade back surface 2b and the abdomen surface 3b of the developer recovery member 3, the developer (as indicated by the arrow in FIG. 4) is transferred to the rear end as it is along the abdomen surface 3b or the rib 3c of the developer recovery member 3. D) also reaches the developer conveying member 4 provided so as to close the gap between the rear surface 2b of the cleaning blade and the developer collecting member 3. In this way, the developer that has reached the developer transport member 4 flows obliquely on the inclined surface of the developer transport member 4 toward the side end of the holder support pressure member 6. And it falls below the perpendicular direction from the side end of the holder supporting pressure member 6. For this reason, even if the holder support pressure member 6 protrudes from the cleaning blade back surface 2b at the root portion of the cleaning blade 2 and is arranged so as to close the gap with the developer recovery member 3, the developer is supported by the holder support pressure member 6. It is possible to prevent the stagnation and retention. Thereby, it is possible to prevent the movement of the developer on the photoreceptor 1 from being stagnant.
[0041]
Further, the developer increases as it flows down the inclined surface of the developer transport member 4 and approaches the side end. Therefore, as shown in FIG. 9, the slope of the inclined surface of the developer recovery member 4 is made to be a twisted surface with a change in the gradient of the start point and the end point, thereby further facilitating the flow on the inclined surface. it can.
[0042]
Further, the developer transport speed can be increased by performing surface treatment on the inclined surface of the developer transport member 4 so as to have developer repellent properties. When the developer is oily, the surface treatment may be a method of coating a thermosetting fluorine-based resin (trade name X-70-029B (manufactured by Shin-Etsu Chemical Co., Ltd.)) or the like. When such surface treatment is performed, the adhesion between the developer and the inclined surface is weakened, and the developer does not stay on the inclined surface of the developer conveying member 4 and flows more quickly to the end of the cleaning blade. Can do. This is particularly effective when the inclination of the inclined surface of the developer conveying member 4 cannot be increased due to the downsizing of the apparatus.
[0043]
Further, as shown in FIG. 10, the developer conveying member 4 may be integrated with the blade holder 5. By integrating the developer conveying member 4, the rigidity and mass of the blade holder 5 can be increased, and chatter of the cleaning blade 2 can be suppressed. For this reason, a stable cleaning operation can be performed.
[0044]
Further, as shown in FIG. 11, the developer conveying member 4 may be configured integrally with the holder supporting pressure member 6. By integrating the developer transport member 4, the rigidity of the holder support pressure member 6 is increased, and the deflection of the cleaning blade 2 during pressurization can be reduced. For this reason, the contact state of the cleaning blade 2 with the photosensitive member 1 is stabilized, and a stable cleaning operation can be performed. Moreover, the size of the end portion of the holder supporting pressure member 6 for obtaining the same rigidity can be reduced. Therefore, the apparatus can be miniaturized.
[0045]
As described above, in the wet electrophotographic copying machine of this embodiment, the occurrence of the liquid ring can be suppressed by the cleaning device 16 having a simple configuration. Therefore, a high-quality image can be obtained with a simple and small wet electrophotographic apparatus without fogging, in-machine contamination, color mixing in a multicolor machine, and the like. Further, since the length of the cleaning blade 2 is not increased, the apparatus can be reduced in size. In addition, there is also an advantage that the degree of freedom of design is large with respect to the contact position between the cleaning blade 2 and the photosensitive member 1.
[0046]
【The invention's effect】
  According to the first to seventh aspects of the present invention, a simple and small wet image forming apparatus capable of suppressing generation of a liquid ring by a cleaning blade and preventing fogging, dirt in the machine, color mixing in a multicolor machine, and the like is adopted. Can provide cleaning deviceThe
In particular, according to the second to fifth aspects of the present invention, there is an excellent effect that the developer can be removed more quickly from the image bearing member, and the possibility that the liquid ring is generated can be further reduced.
[0047]
In particular, according to the second aspect of the present invention, there is an excellent effect that it is possible to prevent the developing solution from flowing into the unnecessary area along the back surface of the developing solution collecting member and causing the in-machine contamination, color mixing in the multi-color machine, and the like. is there.
[0049]
  In particular, the claims3According to the invention, there is an excellent effect that the movement of the developer from the image carrier to the rear surface of the cleaning blade can be promoted with an easy configuration without providing a separate member.
[0050]
  In particular, the claims4According to the invention, in the gap formed by the rear surface of the cleaning blade and the abdominal surface of the developer recovery member, the developer stored in the liquid reservoir on the image carrier travels along the abdominal surface from the front end portion of the developer recovery member due to surface tension. There is an excellent effect that it is possible to prevent the movement of the developer moving toward the end portion from stagnating.
[0051]
  In particular, the claims5 or 6According to the invention, there is an excellent effect that it is possible to prevent the movement of the developer from the image bearing member from being stagnant.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a wet electrophotographic copying machine according to an embodiment.
FIG. 2 is a cross-sectional view showing a schematic configuration of a cleaning apparatus employed in the wet electrophotographic copying machine of the present embodiment.
FIG. 3 is an explanatory diagram of a state of a liquid pool when the photosensitive member is stopped.
FIG. 4 is an explanatory diagram of a state of a liquid pool when the photosensitive member rotates.
FIG. 5 is a perspective view showing an opening of a developer recovery member.
FIG. 6 is a top view showing a schematic configuration of a cleaning device.
FIG. 7 is a perspective view of a description for attaching a developer conveying member.
FIG. 8 is a perspective view showing a state in which a developer conveying member is attached.
FIG. 9 is a perspective view showing the shape of a developer conveying member.
FIG. 10 is a perspective view of a developer conveying member integrated with a blade holder.
FIG. 11 is a perspective view of a developer conveying member formed integrally with a holder supporting pressure member.
FIG. 12 is a perspective view showing a schematic configuration of a conventional cleaning device.
FIG. 13 is a cross-sectional view showing a schematic configuration of a conventional cleaning device.
[Explanation of symbols]
1 Photoconductor
2 Cleaning blade
2a Tip thick surface
2b back
3 Developer recovery member
3a tip of developer recovery member
3b Developer recovery member ventral surface
3c rib
4 Developer conveying member
5 Blade holder
6 Holder support pressure member
7 Liquid pool
8 Space formed by the cleaning blade and photoconductor
9 Liquid ring
10 opening
11 Liquid pool on the back of the cleaning blade
12 Charging device
13 Exposure equipment
14 Wet development equipment
15 Transfer device
16 Cleaning device
17 Paper tray
18 Paper Feeder
19 Fixing device

Claims (7)

クリーニングブレードの先端肉厚面が上向きになるよう先端エッジを像担持体表面に当接させ、該クリーニングブレードにて像担持体上の残留現像液を除去するクリーニング装置において、
該クリーニングブレードの先端肉厚面と該像担持体とが形成する空間に配置される先端部と、該クリーニングブレードの背面と間隙をもって対向する面とを備えた現像液回収部材を有し、該現像液回収部材のクリーニングブレード背面と対向する面に複数のリブを設けたことを特徴とするクリーニング装置。
In the cleaning apparatus in which the tip edge is brought into contact with the surface of the image carrier so that the tip thick surface of the cleaning blade faces upward, and the residual developer on the image carrier is removed by the cleaning blade,
Possess a tip and the tip thickness surface and the image bearing member of said cleaning blade is disposed in a space formed, the developer collecting member having a surface facing with the back and the gap of the cleaning blade, the A cleaning device comprising a plurality of ribs provided on a surface of the developer collecting member facing the back surface of the cleaning blade .
請求項1のクリーニング装置において、上記現像液回収部材に開口を設けたことを特徴とするクリーニング装置 2. The cleaning apparatus according to claim 1, wherein an opening is provided in the developer recovery member . 求項1または2のクリーニング装置において、上記現像液回収部材のリブが上記クリーニングブレードの背面先端と接触するよう配置したことを特徴とするクリーニング装置。In the cleaning apparatus of Motomeko 1 or 2, cleaning device ribs of the developer collecting member is characterized by being placed in contact with the rear distal end of the cleaning blade. 請求項1,2またはのクリーニング装置において、上記クリーニングブレードを支持加圧するブレード支持加圧部材を、上記クリーニングブレードの根本部において、クリーニングブレード背面と現像液回収部材との間隙を塞ぐよう配置するとともに、上記現像液回収部材のリブを現像液回収部材の後端にいくに従い側端に向かうよう斜めに配置したことを特徴とするクリーニング装置。The cleaning apparatus according to claim 1, 2 or 3, the blade support pressure member for pressurizing supporting pressure of the cleaning blade, the root portion of the cleaning blade is arranged so as to close the gap between the cleaning blade and back with a developer collecting member In addition, the cleaning device is characterized in that the rib of the developer collecting member is disposed obliquely toward the side end toward the rear end of the developer collecting member. 請求項1、2、3または4のクリーニング装置において、上記クリーニングブレードを支持加圧するブレード支持加圧部材を上記クリーニングブレードの根本部において、クリーニングブレード背面と現像液回収部材との間隙を塞ぐよう配置するとともに、上記ブレード支持加圧部材の側端に向かって傾斜した傾斜面を有する現像液搬送部材を上記ブレード支持加圧部材上に配設したことを特徴とするクリーニング装置。The cleaning apparatus according to claim 1, 2, 3 or 4, a blade supporting pressure member for pressurizing supporting pressure of the cleaning blade at the root portion of the cleaning blade, so as to close the gap between the cleaning blade and back with a developer collecting member arranged then the Tomo, a cleaning device, characterized in that the developer conveying member having an inclined surface inclined toward the side edge of the blade supporting pressure member is disposed on said blade supporting pressure member. クリーニングブレードの先端肉厚面が上向きになるよう先端エッジを像担持体表面に当接させ、該クリーニングブレードにて像担持体上の残留現像液を除去するクリーニング装置において、  In the cleaning apparatus in which the tip edge is brought into contact with the surface of the image carrier so that the tip wall surface of the cleaning blade faces upward, and the residual developer on the image carrier is removed by the cleaning blade,
該クリーニングブレードの先端肉厚面と該像担持体とが形成する空間に配置される先端部と、該クリーニングブレードの背面と間隙をもって対向する面とを備えた現像液回収部材を有し、  A developer collecting member having a tip portion disposed in a space formed by the tip thick surface of the cleaning blade and the image carrier, and a surface facing the back surface of the cleaning blade with a gap;
上記クリーニングブレードを支持加圧するブレード支持加圧部材を上記クリーニングブレードの根本部において、クリーニングブレード背面と現像液回収部材との間隙を塞ぐよう配置するとともに、上記ブレード支持加圧部材の側端に向かって傾斜した傾斜面を有する現像液搬送部材を上記ブレード支持加圧部材上に配設したことを特徴とするクリーニング装置。A blade supporting pressure member for supporting and pressing the cleaning blade is disposed at the root of the cleaning blade so as to close a gap between the rear surface of the cleaning blade and the developer recovery member and toward the side end of the blade supporting pressure member. A cleaning device comprising a developer conveying member having an inclined surface inclined on the blade supporting pressure member.
静電潜像を担持する像担持体と、該像担持体上の静電潜像を現像液を用いて顕像化する湿式現像装置と、該像担持体上の顕像を被転写体に転写したのち、像担持体上から残留現像液を除去するクリーニング装置とを備えた湿式画像形成装置において、
上記クリーニング装置として、請求項1、2、3、4、5または6のクリーニング装置を用いたことを特徴とする湿式画像形成装置。
An image carrier that carries an electrostatic latent image, a wet developing device that visualizes the electrostatic latent image on the image carrier using a developer, and a visible image on the image carrier to be transferred In the wet image forming apparatus provided with a cleaning device that removes the residual developer from the image carrier after the transfer,
A wet image forming apparatus using the cleaning apparatus according to claim 1, 2, 3, 4, 5, or 6 as the cleaning apparatus.
JP2000189564A 2000-06-23 2000-06-23 Wet image forming apparatus and cleaning apparatus Expired - Fee Related JP3989162B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
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JP2002287587A (en) * 2001-03-22 2002-10-03 Ricoh Co Ltd Cleaning device in wet electrophotographic apparatus
JP2007010806A (en) * 2005-06-28 2007-01-18 Fuji Xerox Co Ltd Cleaning device and image forming device

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KR100653086B1 (en) 2005-01-21 2006-12-01 삼성전자주식회사 Waste toner crusher and toner cartridge having same
JP2008164788A (en) * 2006-12-27 2008-07-17 Kyocera Mita Corp Image forming apparatus and cleaning member for the same
JP5124342B2 (en) * 2008-05-20 2013-01-23 京セラドキュメントソリューションズ株式会社 Cleaning blade and image forming apparatus provided with the same
ITMI20130115A1 (en) 2013-01-25 2014-07-26 Concordia Dev Srl PREFORMATION OF PLASTIC MATERIALS WITH A LOW END CLOSED END

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002287587A (en) * 2001-03-22 2002-10-03 Ricoh Co Ltd Cleaning device in wet electrophotographic apparatus
JP2007010806A (en) * 2005-06-28 2007-01-18 Fuji Xerox Co Ltd Cleaning device and image forming device

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