JPH07225512A - Developing device - Google Patents

Developing device

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Publication number
JPH07225512A
JPH07225512A JP6016798A JP1679894A JPH07225512A JP H07225512 A JPH07225512 A JP H07225512A JP 6016798 A JP6016798 A JP 6016798A JP 1679894 A JP1679894 A JP 1679894A JP H07225512 A JPH07225512 A JP H07225512A
Authority
JP
Japan
Prior art keywords
developer
developing
optimizing
latent image
electrostatic latent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP6016798A
Other languages
Japanese (ja)
Inventor
Nobuo Kasahara
伸夫 笠原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP6016798A priority Critical patent/JPH07225512A/en
Publication of JPH07225512A publication Critical patent/JPH07225512A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To provide a developing device capable of miniaturizing the developing means, simplifying the constitution and improving the operability at the time of maintenance. CONSTITUTION:The developing device is provided with the developer optimizing means 1000 for optimizing the developer, constituted as a unit of individual body at the position different from the developing means 10, and the developer transfer circulation means for feeding the optimized developer from the developer optimizing means 1000 to the developing means 10 and for collecting the remaining residue of the developer fed for developing from the developing means 10 to the developer optimizing means 1000, and moreover the developing means 10 is provided with the developing sleeve 100, the developer feeding member 110 for feeding the developer to the developing sleeve 100, the developer layer regulating member 130 arranged between the the developer feeding member 110 and the developing position, the developer collecting member 120 for collecting the residual developer from the developing sleeve 100, the inlet for receiving the optimized developer, and the outlet for sending the collected developer to the developer optimizing means 1000.

Description

【発明の詳細な説明】Detailed Description of the Invention

【産業上の利用分野】本発明は、電子写真法を用いた画
像形成装置における現像装置、特に、2成分現像剤を用
いて現像するプリンター、ファクシミリ、複写機等に適
用できる現像装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device in an image forming apparatus using an electrophotographic method, and more particularly to a developing device applicable to a printer, a facsimile, a copying machine or the like for developing using a two-component developer.

【従来の技術】静電潜像担持体に対向して配置されてい
て、トナーとキャリアを混合した2成分の現像剤を上記
静電潜像担持体に付与して、この静電潜像担持体上の静
電潜像を現像する現像スリーブを有する現像手段を具備
した現像装置に関する技術として次のものがある。 .2成分現像剤を用いた現像装置であって、感光体ド
ラムの内部に現像剤の撹拌手段を持ち、現像器とパイプ
で結び、現像剤の循環を行う技術(特公平5−2108
2号公報参照)。 .現像容器へ現像剤又はキャリアを供給し、同時にこ
れと同量の現像剤を排出し、現像で消費されたトナーを
体積検知手段で検知してトナーを供給し、簡単に現像容
器内の現像剤濃度を常に一定に保つ技術(特公昭60−
18065号公報参照)。 .現像剤濃度を体積の変化によって検知する技術(特
開昭50−19459号公報参照)。 .現像部と該現像部に所定現像時間或は所定複写量に
応じて定量のキャリアを供給する手段と、現像剤中のキ
ャリアとトナーの比率変化を検知し信号を発する検知手
段と、該信号によりトナーを現像部に供給する手段と、
現像部内の所定量以上の現像剤を排出する手段とを有す
る現像装置に係る技術(特開昭51−13249号公報
参照)。 .トナー及びキャリアを含む追加現像剤を現像装置内
の現像剤に供給することにより、現像剤の寿命を引き延
ばすことに係る技術(特開平4−353881号公報参
照)。
2. Description of the Related Art A two-component developer, which is disposed so as to face an electrostatic latent image bearing member and contains a mixture of toner and a carrier, is applied to the electrostatic latent image bearing member to carry out the electrostatic latent image bearing member. The following are technologies relating to a developing device equipped with a developing means having a developing sleeve for developing an electrostatic latent image on the body. . A developing device using a two-component developer, in which a developer stirring means is provided inside a photosensitive drum, and the developer is circulated by connecting the developer with a pipe (Japanese Patent Publication No. 5-2108).
No. 2). . The developer or carrier is supplied to the developing container, at the same time, the same amount of the developer is discharged, and the toner consumed by the development is detected by the volume detecting means to supply the toner, and the developer in the developing container is easily supplied. Technology to keep the concentration constant (Japanese Patent Publication Sho 60-
18065). . A technique for detecting the developer concentration by a change in volume (see Japanese Patent Application Laid-Open No. 50-19459). . A developing unit, a unit for supplying a fixed amount of carrier to the developing unit according to a predetermined developing time or a predetermined copying amount, a detecting unit for detecting a change in the ratio of the carrier and the toner in the developer and issuing a signal, and the signal Means for supplying toner to the developing section,
A technique relating to a developing device having a means for discharging a predetermined amount or more of developer in the developing section (see Japanese Patent Laid-Open No. 51-13249). . A technique relating to extending the life of the developer by supplying the additional developer containing the toner and the carrier to the developer in the developing device (see Japanese Patent Laid-Open No. 4-353881).

【発明が解決しようとする課題】従来の現像装置では、
静電潜像担持体としての感光体ドラムに対向して配置さ
れる現像スリーブに現像剤を供給するべく現像剤を貯溜
しておく貯溜部分やトナーを補給するタンクが上記現像
スリーブの近傍に、該現像スリーブを収めたユニットと
して構成される現像手段と一体的に構成されるため、そ
の構成部分が大型になり、装置構成が複雑になると共
に、装置メンテナンス時の操作性が低下する問題があっ
た。したがって、本発明は、静電潜像担持体に対向して
構成される現像手段を小型化し、構成を簡易にし、メン
テナンス時の操作性を向上させることのできる現像装置
を提供することを目的とする。
In the conventional developing device,
In the vicinity of the developing sleeve, there is a storage portion for storing the developer so as to supply the developer to the developing sleeve arranged to face the photosensitive drum as the electrostatic latent image carrier and a tank for replenishing the toner, Since it is integrally formed with the developing means configured as a unit containing the developing sleeve, there is a problem that its constituent parts become large in size, the apparatus structure becomes complicated, and the operability at the time of apparatus maintenance is deteriorated. It was Therefore, it is an object of the present invention to provide a developing device capable of downsizing a developing unit configured to face an electrostatic latent image carrier, simplifying the configuration, and improving operability during maintenance. To do.

【課題を解決するための手段】上記目的を達成するため
に、本発明は次のように構成した。 (1).請求項1記載の発明は、静電潜像担持体に対向
して配置されていて、上記静電潜像担持体との対向部に
おいて上記静電潜像担持体と同一方向に回転し、トナー
とキャリアとを混合した現像剤を上記静電潜像担持体に
付与し、該静電潜像担持体上の静電潜像を現像する現像
スリーブを有する現像手段を具備した現像装置におい
て、上記現像手段とは異なる位置に別体のユニットとし
て構成された、現像剤を適正化する現像剤適正化手段
と、該現像剤適正化手段から上記現像手段に適正化され
た現像剤を供給し、かつ、上記現像手段から上記現像剤
適正化手段に現像に付与された残りの余剰現像剤を回収
する現像剤移送循環手段とを有し、上記現像手段は、上
記現像スリーブに対して現像剤を供給する現像剤供給部
材と、上記現像スリーブのまわりであって上記現像剤供
給部材と現像位置との間に配置された現像剤層規制部材
と、上記現像スリーブからの余剰の現像剤を回収する現
像剤回収部材と、上記現像剤適正化手段により適正化さ
れた現像剤を受け入れる入口と、上記現像剤回収部材に
より回収された現像剤を上記現像剤適正化手段へ送り出
す出口とを具備したことを特徴としている。 (2).請求項2記載の発明は、請求項1記載の現像装
置において、上記現像剤供給部材が、上記現像剤層規制
部材と上記現像剤回収部材との間であり、かつ、上記現
像スリーブの下方位置に設けられていることを特徴とし
ている。 (3).請求項3記載の発明は、静電潜像担持体に対向
して配置されていて、上記静電潜像担持体との対向部に
おいて上記静電潜像担持体と逆方向に回転し、トナーと
キャリアとを混合した現像剤を上記静電潜像担持体に付
与し、該静電潜像担持体上の静電潜像を現像する現像ス
リーブを有する現像手段を具備した現像装置において、
上記現像手段とは異なる位置に別体のユニットとして構
成された、現像剤を適正化する現像剤適正化手段と、該
現像剤適正化手段から上記現像手段に適正化された現像
剤を供給し、かつ、上記現像手段から上記現像剤適正化
手段に現像に付与された残りの余剰現像剤を回収する現
像剤移送循環手段とを有し、上記現像手段は、上記現像
スリーブに対して現像剤を供給する現像剤供給部材と、
上記現像スリーブのまわりであって上記現像剤供給部材
と現像位置との間に配置された現像剤層規制部材と、上
記現像スリーブからの余剰の現像剤を回収する現像剤回
収部材と、上記現像剤適正化手段により適正化された現
像剤を受け入れる入口と、上記現像剤回収部材により回
収された現像剤を上記現像剤適正化手段へ送り出す出口
とを具備したことを特徴としている。 (4).請求項4記載の発明は、請求項3記載の現像装
置において、上記現像剤供給部材が、上記現像剤層規制
部材と上記現像剤回収部材との間であり、かつ、上記現
像スリーブの下方位置に設けられていることを特徴とし
ている。 (5).請求項5記載の発明は、請求項1記載の現像装
置において、上記現像スリーブが複数設けられているこ
とを特徴としている。 (6).請求項6記載の発明は、請求項1記載の現像装
置において、上記現像スリーブが複数設けられ、そのう
ちの1つの現像スリーブに対してのみ上記現像剤供給部
材が、現像剤を供給することを特徴としている。 (7).請求項7記載の発明は、請求項6記載の現像装
置において、上記現像スリーブは2つ、上記現像剤供給
部材は1つ用いられており、上記現像剤供給部材はこれ
らの現像スリーブのうち、静電潜像を最初に現像する現
像スリーブに対して、現像剤を供給することを特徴とし
ている。 (8).請求項8記載の発明は、請求項1記載の現像装
置において、現像手段は回転中心軸に対して放射状に複
数設けられており、回転位置の制御によりこれら各現像
手段の現像スリーブを上記静電潜像担持体に順次対向位
置させて現像する回転型現像ユニットの一部として構成
されていることを特徴としている。 (9).請求項9記載の発明は、請求項8記載の現像装
置において、各現像手段は、イエロー、マゼンタ、シア
ン、ブラックの各現像剤を各1色ずつ収容してなるもの
であることを特徴としている。 (10).請求項10記載の発明は、請求項8におい
て、各現像手段の現像剤供給部材と現像剤回収部材との
間には現像剤導路手段が設けられていて、これらの各現
像剤導路手段が、一つの部材で一体的に形成されている
ことを特徴としている。
In order to achieve the above object, the present invention has the following constitution. (1). According to a first aspect of the present invention, the toner is arranged so as to face the electrostatic latent image bearing member, and rotates in the same direction as the electrostatic latent image bearing member at a portion facing the electrostatic latent image bearing member. And a carrier are applied to the electrostatic latent image carrier to develop the electrostatic latent image on the electrostatic latent image carrier, and the developing device is equipped with a developing sleeve having a developing sleeve. Supplying the optimized developer to the developing means from the developer optimizing means for optimizing the developer, which is configured as a separate unit at a position different from the developing means, And a developer transfer / circulation means for recovering the remaining excess developer applied to the development from the developing means to the developer optimizing means, wherein the developing means supplies the developer to the developing sleeve. The developer supply member to be supplied and the rotation of the developing sleeve. And a developer layer regulating member arranged between the developer supply member and the developing position, a developer collecting member for collecting the excessive developer from the developing sleeve, and the developer optimizing means. It is characterized by having an inlet for receiving the optimized developer and an outlet for sending the developer recovered by the developer recovery member to the developer optimizing means. (2). According to a second aspect of the present invention, in the developing device according to the first aspect, the developer supply member is between the developer layer regulating member and the developer collecting member, and a position below the developing sleeve. It is characterized by being provided in. (3). According to a third aspect of the present invention, the toner is arranged so as to face the electrostatic latent image bearing member, and rotates in a direction opposite to the electrostatic latent image bearing member at a portion facing the electrostatic latent image bearing member, and toner In a developing device equipped with a developing means having a developing sleeve for applying a developer containing a mixture of a carrier and a carrier to the electrostatic latent image carrier to develop the electrostatic latent image on the electrostatic latent image carrier,
A developer optimizing means for optimizing the developer, which is configured as a separate unit at a position different from the developing means, and the optimized developer is supplied from the developer optimizing means to the developing means. And a developer transfer / circulation means for collecting the remaining excess developer applied to the development from the developing means to the developer optimizing means, wherein the developing means is a developer for the developing sleeve. A developer supply member for supplying
A developer layer regulating member disposed around the developing sleeve and between the developer supplying member and the developing position; a developer collecting member for collecting the excessive developer from the developing sleeve; It is characterized by having an inlet for receiving the developer optimized by the agent optimizing means and an outlet for sending the developer recovered by the developer recovery member to the developer optimizing means. (4). According to a fourth aspect of the invention, in the developing device according to the third aspect, the developer supply member is between the developer layer regulating member and the developer collecting member, and a position below the developing sleeve. It is characterized by being provided in. (5). According to a fifth aspect of the invention, in the developing device according to the first aspect, a plurality of the developing sleeves are provided. (6). According to a sixth aspect of the present invention, in the developing device according to the first aspect, a plurality of the developing sleeves are provided, and the developer supply member supplies the developer only to one of the developing sleeves. I am trying. (7). According to a seventh aspect of the invention, in the developing device according to the sixth aspect, two developing sleeves and one developer supplying member are used, and the developer supplying member is one of these developing sleeves. It is characterized in that the developer is supplied to the developing sleeve for developing the electrostatic latent image first. (8). According to an eighth aspect of the present invention, in the developing device according to the first aspect, a plurality of developing means are provided radially with respect to a rotation center axis, and the developing sleeve of each of the developing means is electrostatically controlled by controlling the rotational position. It is characterized in that it is configured as a part of a rotary developing unit for sequentially developing the latent image bearing member so as to face it. (9). According to a ninth aspect of the present invention, in the developing device according to the eighth aspect, each developing means contains one color each of yellow, magenta, cyan, and black developers. . (10). According to a tenth aspect of the present invention, in the eighth aspect, the developer guiding means is provided between the developer supply member and the developer collecting member of each developing means. However, it is characterized by being integrally formed by one member.

【作用】現像手段とは異なる位置に別体のユニットとし
て構成された現像剤適正化手段から現像剤移送循環手段
を介して現像手段の現像剤供給部材に、現像剤適正化手
段により適正化された現像剤が供給される。その適正化
された現像剤は、現像剤供給部材により現像スリーブに
供給される際に、現像剤層規制部材により現像スリーブ
上において最適現像層厚に規制されて現像に供され、現
像スリーブからの余剰現像剤は、現像剤回収部材により
回収され、現像剤移送循環手段を介して現像剤適正化手
段に回収される。
The developer optimizing means is adapted to the developer supply member of the developing means from the developer optimizing means, which is formed as a separate unit at a position different from the developing means, through the developer transfer / circulating means. Developer is supplied. When the optimized developer is supplied to the developing sleeve by the developer supply member, the developer layer restricting member regulates the developing layer to an optimum developing layer thickness, and the developed developer is supplied to the developing sleeve. The surplus developer is recovered by the developer recovery member and then recovered by the developer optimizing means via the developer transfer / circulation means.

【実施例】以下、添付図面を参照して本発明の実施例に
ついて詳述する。まず、図1を参照して実施例の全体構
成について説明する。図1において、符号10は現像手
段、符号1000は現像剤適正化手段をそれぞれ示す。
現像剤適正化手段1000は、現像手段10とは異なる
位置に別体のユニットとして構成されていて、現像剤を
適正化する機能を有する。この現像剤適正化手段100
0には新しいトナーを補給するトナー補給ユニットを設
けることができる。この現像剤適正化手段1000と現
像手段10との間では現像剤の循環が行われる。この循
環は現像剤移送・循環手段500により行われる。現像
手段10は、現像剤適正化手段1000により適正化さ
れた現像剤を受け入れる入口111aと、現像手段10
により現像に用いられた余剰の現像剤を現像剤適正化手
段1000に送り出す出口121aを有している。現像
剤はトナーとキャリアとからなる2成分の現像剤が用い
られる。現像剤を適正化するとは、トナーとキャリアの
混合比を調整し現像剤の濃度及び帯電量を適正化するこ
とが含まれる。また、現像剤に混入した紙粉等の異物
は、循環過程において異物除去手段により除去される。
現像剤適正化手段1000は、トナー補給手段、トナー
とキャリアの撹拌部材、現像剤濃度検知手段としての濃
度センサを具備する。なお、現像剤適正化手段1000
に上記異物除去手段等を付帯させることもできる。現像
手段10は乾式で2成分現像剤を用いるものであり、磁
気ブラシ現像方式を採用している。なお、現像手段10
はカスケード現像方式を採用することもできる。現像剤
適正化手段1000は、現像手段10と異なる位置に配
置されるため、両者間は現像剤移送・循環手段500を
介して連結される。この現像剤移送・循環手段500
は、これら両者間に現像剤を循環させる働きを有するも
のであるから、現像剤適正化手段1000と入口111
aとを結ぶ供給路(図1における上向きの矢印の経路)
と、現像剤適正化手段1000と出口121aとを結ぶ
回収路(図1における下向きの矢印の経路)と、これら
現像手段10、現像剤適正化手段1000、上記供給
路、上記回収路で構成される現像剤の循環路中の任意の
部位に設けた現像剤移送用のポンプ及び異物除去手段を
具備している。上記供給路を通る現像剤は、現像剤適正
化手段1000により現像剤の濃度及び帯電量が適正化
された現像剤であり、上記回収路を通る現像剤は現像手
段10により現像に供与された余剰現像剤であり、適正
化がなされる以前の現像剤である。これらの上記供給
路、上記回収路は、管を以って構成される。現像剤移送
用のポンプは粉体移送用のスクリューポンプで構成さ
れ、該ポンプについては、現像剤適正化手段1000に
組み込む形で構成することができる。以上の全体構成例
によれば、現像剤を適正化し、また、トナー補給ユニッ
トを設けることのできる現像剤適正化手段を現像手段と
は異なる位置に別体のユニットとして設置することがで
きるので、現像手段の構成が非常に簡易となるばかりで
なく、小型化が図れ、複雑な画像形成装置の内部構成が
簡易化され、レイアウト上の余裕も生じるので、メンテ
ナンスの容易化が図れる。また、現像は現像剤適正化手
段により常に最適化された現像剤により行うことができ
るので、現像品質が高品質で安定し、画像品質も高品質
で安定したものとなる。さらに、トナー供給及び現像剤
を攪拌する手段が現像手段と別体であり、かつ、現像手
段や感光体等の作像ユニットから離れた箇所に設置でき
るので、従来の装置で問題となっている現像装置でのト
ナー飛散や現像剤の飛散等の発生が非常に少なくなる。
よって、異常画質の発生がなく、画像品質も安定すると
共に装置のメンテナンス間隔が長くなり信頼性の向上が
図れる。次に、実施例の詳細について説明する。図2に
おいて、符号1は、静電潜像担持体をドラム状に構成し
た感光体ドラムを示す。符号50は、露光手段を構成す
るLED(発光ダイオード)アレイを示す。符号60は
転写材を、符号70は転写ローラをそれぞれ示す。な
お、上記静電潜像担持体は、ドラム以外にベルト状に構
成することもできる。転写材60としては転写紙等が用
いられる。この感光体ドラム1上には、従来公知の電子
写真作像工程により帯電、LED(発光ダイオード)ア
レイ50により光像Pが照射され露光が行われて静電潜
像が形成される。この静電潜像は公知の乾式2成分現像
方式で磁気ブラシ現像方式を採用した現像手段10によ
り供与される現像剤により可視像化される。ここで、現
像手段10には、現像剤を感光体ドラム1に供与する直
接の手段である現像スリーブ100が含まれることは勿
論であるが、ここにおける現像手段10とは、この現像
スリーブ100の周囲に付帯して設けられた現像剤供給
部材110、現像剤回収部材120、現像剤層規制部材
130、通路手段、及びこれら諸部材を収容保持するケ
ース150をも含むユニットをいう。現像スリーブ10
0はスリーブ及びこのスリーブ内に設けた磁石等からな
る公知の構成を有している。現像手段10は、図中矢印
方向に回転する感光体ドラム1のまわりであって、光像
Pを照射して潜像を形成する露光位置と、その潜像を可
視化したトナー像を転写材60にバイアス転写するため
の転写ローラ70が設けられた転写位置との間にある現
像位置、つまり、図2において現に現像スリーブ100
が感光体ドラム1に対向して配置されていて、感光体ド
ラム1の対向近接部分において感光体ドラム1と同一方
向に移動するように回転される。感光体ドラム1は図2
の紙面を貫く方向に長さを有しており、この長さ方向を
感光体ドラム1の幅方向と称すれば、この幅方向にわた
り画像が形成される。したがって、現像スリーブ100
も感光体ドラム1の幅方向に現像剤を供与する必要があ
り、現像スリーブ100は感光体ドラム1に合わせてそ
の幅方向の寸法が定められている。このため、現像スリ
ーブ100に対してその幅方向にわたって現像剤を供給
する必要から、現像剤供給部材110は少なくとも現像
スリーブ100の幅方向全域をカバーしている。現像剤
回収部材120は、現像スリーブ100からの余剰の現
像剤を回収し、現像手段100の外部に排出するための
もので、現像剤供給部材110と同様に現像スリーブ1
00の幅方向全域をカバーしている。本実施例では、図
2に示すように、現像剤供給部材110は、現像スリー
ブ100のまわりであって、現像スリーブ100の軸方
向から見て5時半の位置に、現像剤回収部材120は3
時半の位置にそれぞれ設けられており、共にスクリュー
を利用した移送手段として構成されていて、共に図示を
省略した駆動手段により現像剤を入口111a,出口1
21a(図3及び図4に示す)側に送り出すように回転
される。図2において、現像スリーブ100の右側下方
には、上下二段のU字状に形成された部分を有するケー
ス150が設けられている。ケース150の上段のU字
状部分には、現像スリーブ100からの余剰の現像剤を
回収する現像剤回収部材120が収納されている。一
方、ケース150の下段のU字状部分には、現像スリー
ブ100に対して現像剤を供給する現像剤供給部材11
0が収納されている。各U字状に形成された部分の間の
ケース150には、現像剤供給部材110及び現像剤回
収部材120の上方に延出し、その上端が現像スリーブ
の外周面に近接した現像剤ガイド部材140が一体的に
形成されている。現像剤ガイド部材140は、現像剤供
給部材110及び現像剤回収部材120を仕切る隔壁で
あると共に、現像スリーブ100からの余剰現像剤を現
像剤回収部材120に案内する機能を有する。現像スリ
ーブ100及び現像剤回収部材120の上方には、蓋1
60が設けられていて、蓋160の基端部は、現像剤回
収部材120側におけるケース150の一側上端に開閉
可能に設けられている。これらの蓋160、現像剤ガイ
ド部材140の上部及びケース150が、現像スリーブ
100からの余剰現像剤を現像剤回収部材120に送る
導通路Rを構成する。図2において、現像剤層規制部材
130は、現像スリーブ100のまわりであって現像剤
供給部材110と上記現像位置との間に配置されてい
る。この現像剤層規制部材130は、所謂ドクターと称
されるものであって、その基端側はケース150の他側
端に固定されており、自由端側は現像スリーブ100に
近接対向していて、現像スリーブ上の現像剤を掻き取
り、層厚を規制すると共に掻き取られた現像剤を回収す
る機能を有している。上記のとおり、現像剤供給部材1
10は、現像スリーブ100のまわりであって、現像剤
層規制部材130と現像剤回収部材120との間であ
り、かつ、現像スリーブ100の下方位置に設けられて
いる。現像に際しての余剰の現像剤は、現像スリーブ1
00と共に現像スリーブ100の回動方向である図中矢
印の向きに回動していき、導通路Rを通り現像剤ガイド
部材140により案内されつつその一部は掻き取られて
現像剤回収部材120に導かれる。図3及び図4におい
て、ケース150における現像スリーブ100の幅方向
両端は、側板101で塞がれている。一端側の側板10
1の一部は、現像剤供給部材110及び現像剤回収部材
120のスクリュー部分を収容する円孔を形成するべく
円柱状に突出していて、この円柱状部分に形成された円
孔に現像剤供給部材110、現像剤回収部材120の各
スクリュー部がそれぞれ嵌合されている。更に、各スク
リュー部の端部軸は上記円孔を塞ぐ蓋部材101a、1
01bにより軸支されている。また、これら各円孔の中
間部には該円孔と直交する方向に、入口111aと、出
口121aが設けられている。入口111aは、図1及
び図2に示す現像剤適正化手段1000の現像剤吐出口
206と、出口121aは現像剤適正化手段1000の
現像剤流入口225と、それぞれ供給路としての供給管
111、回収路としての回収管121により連結されて
いる。かかる構成により、現像剤適正化手段1000の
現像剤吐出口206から供給管111により現像手段1
0の入口111aに移送された現像剤は、更に、現像剤
供給部材110により現像スリーブ100と並行に移送
され、後述する粉体ポンプユニット200からの圧送力
が上記移送に伴う移送力に加わって現像剤層規制部材1
30を経て現像スリーブ100の全面に送られる。この
とき、現像剤は、現像剤層規制部材130により最適現
像層厚になされ、現像に供される。現像剤層規制部材1
30により掻き取られた現像剤も現像に際しての余剰の
現像剤であり、この現像剤は現像剤供給部材110に戻
される。また、感光体ドラム1に供与されたものの、静
電潜像部分に付着しなかった現像剤も現像に際しての余
剰の現像剤であり、導通路Rを通り現像剤ガイド部材1
40により案内されつつその一部は掻き取られ現像剤回
収部材120に導かれる。現像剤回収部材120に導か
れた現像剤は、現像剤回収部材120により出口121
a及び排出管121を経て、現像剤最適化手段1000
に送り出される。以上述べた実施例によれば、現像手段
10は、その駆動が現像スリーブ100及び現像剤供給
部材110、現像剤回収部材120を駆動するだけでよ
いので、上記例で述べた、現像手段の構成簡易化、小型
化をさらに図ることができると共に、高信頼性化、省電
力化及びメンテナンス容易化も図ることができる。以下
に、現像剤適正化手段及び、現像剤移送・循環手段とし
てのポンプ等の例について図7により説明する。図7に
おいて、現像手段10から排出された現像剤は、排出管
121を介して現像剤流入口225から現像剤適正化手
段1000に導かれる。図7において、符号220は現
像剤撹拌ユニットを示し、下部が筒状で上部がロート状
の剤収納容器223と、該容器内にて駆動モーター22
2により回転される撹拌スクリュー221により構成さ
れている。剤収納容器223の上部にはトナー補給ユニ
ット230のトナー出口235及び現像剤流入口225
が開口している。トナー補給ユニット230には蓋23
0aを開けて新しいトナー231を適宜供給できるよう
になっており、その下部に設けられたトナー出口235
を塞ぐようにしてトナー供給部材232が設けられてい
る。このトナー供給部材232は回転駆動される円柱状
部分の周面に、回転軸線方向に沿って多数の切欠きを形
成してなるもので、上記切欠きに入ったトナーをトナー
供給部材232の回転により剤収納容器223に供給す
る機能を有している。現像剤適正化手段1000の下部
には現像剤吐出口206が位置しているが、この現像剤
出口206近傍の現像剤通路270の途中には現像剤濃
度検知部材240が設けられていて、未図示の従来公知
の現像剤濃度検知制御回路からの信号により、トナー供
給部材232が回転し、トナー補給ユニット230内の
トナー231を剤収納容器223内に供給するようにな
っている。このように、現像手段10からの回収された
現像剤に、トナー補給ユニット230から制御されつつ
補給される新規のトナー231が加えられて、現像剤撹
拌ユニット220において、現像剤濃度と帯電量が現像
に最適の条件を具備するようにその適正化が行われる。
こうして適正化が行われた現像剤は、現像剤撹拌ユニッ
ト220の下部に位置する粉体ポンプユニット200に
送られる。粉体ポンプユニット200はスクリューポン
プ、すなわち通称モーノポンプと呼ばれる従来公知の構
造をもって構成されている。このポンプは、上述の駆動
モーター222と撹拌スクリュー221を介して連結さ
れたローター201と、ゴム材料等の弾性体で作られて
いてローター201を包囲しているステイター202、
このステイター202を保持する上ポンプホルダー20
3u、下ポンプホルダー203d等を具備している。上
ポンプホルダー203uは、粉体ポンプユニット200
と現像剤撹拌ユニット220とを連結している。下ポン
プホルダー203dの下部には上記したように、現像剤
通路270が設けられており、現像剤通路270を介し
て上記スクリューポンプの出口と、現像剤吐出口206
とが連通されている。この現像剤通路270上であって
スクリューポンプの出口、つまり、ローター201の下
端部近傍の位置には下部空気供給口205が設けられて
いる。この下部空気供給口205は、現像剤通路270
に連通している。一方、上ポンプホルダー203u上で
あって、粉体ポンプユニット200の入口近傍の位置に
は、剤収納容器223に連通する上部空気供給口204
が設けられている。これら、上部空気供給口204及び
下部空気供給口205の各外側は、それぞれ、駆動モー
ター222により回転されるファン207を収容するフ
ァンケースの一部に設けられた2つの空気吐出口208
と管を介して連通している。駆動モーター222が回転
すると、ファン207は外部より空気を吸入し、上部空
気供給口204及び下部空気供給口205を介して現像
剤に、0.5〜2リットル/分程度の送風量で空気を吹
き込む。これにより、現像剤は流動化が促進されて、ス
クリューポンプでの移送がより確実なものとなる。この
供給空気量は微量であり、現像剤の移送に寄与した後、
現像手段10の隙間部分から外部に抜ける。図7に示す
例では、ファン207が駆動モーター222と同軸に取
付られているが、このような構成とせず、別体のポンプ
を設けて上部、下部の各空気供給口204,205に空
気の供給を行うこともできる。粉体ポンプユニット20
0を通過した現像剤は、現像濃度検知部材240によ
り、その剤濃度が検知され、現像剤吐出口206より排
出され、供給管111を介して入口111aから現像手
段10に送られる。この例では、図2に示すように、現
像剤適正化手段1000を現像手段10の下方に位置さ
せているので、現像剤適正化手段1000から現像手段
10へは、ポンプの力を用いないと現像剤を送り出せな
いが、現像手段10から現像剤適正化手段1000に対
しては重力を利用して移送するので、ポンプ手段は不要
である。なお、これら現像手段と現像剤適正化手段の位
置関係が上記と逆となる場合、及び略同じ高さ位置に配
置される場合等には、現像剤の移送力を得るべく、循環
経路中に適宜ポンプを配備する。現像手段10と現像剤
濃度適正化手段1000との間、例えば、排出管121
の途中、或は供給管111の途中に、現像剤に混入した
異物、例えば紙粉を除去する除去手段を設けることは現
像品質を向上する上で効果的である。この除去手段とし
ては、フィルター、静電吸着或いは遠心分離等の手段を
適宜選択して採用する。本実施例で使用しているモーノ
ポンプと称される公知のスクリューポンプは、回転容積
式で、圧送式移送によるものであり、極少空気による高
い固気比で移送されるので、粉体からなる現像剤は供給
管111内を充満して連続的に流れる。したがって、高
い定量性と、連続移送の高精度流量コントロールが可能
であり、かつ、使用する移送用空気も粉体の流動化と移
送ライン全長に均一の流動状態を保持するためのごく少
量の空気量でよい。更に、低速・高濃度移送であるの
で、粉体の破砕もなく、小径の配管ですみ、かつ、移送
管の摩耗のトラブルもなく、また騒音も少なく、構造が
簡易であり、経済性、信頼性、メンテナンス性に優れる
等の特徴を有する。以上の現像装置において、長期の使
用によりキャリアが劣化した場合には、現像剤を該現像
装置から全部抜き取る必要があるが、その場合には、各
ユニットの現像剤を空にすべく、現像剤適正化手段10
00より排出管121を外してこの排出管121の先を
図示しない回収容器に接続し、駆動モーター222を駆
動する。これにより、劣化したキャリアを含む現像剤は
全て上記回収容器に収容される。上記回収容器に収容さ
れた現像剤は廃棄、再利用等適切に措置することができ
る。なお、上記回収容器に収容する作業を諸部材の交換
修理等のメンテナンスに際しても行えば、上記諸部材に
残留する現像剤がないので現像剤の飛散がなく、上記メ
ンテナンスにおける作業性が向上する。このようにすれ
ば、従来より行われてきた、現像装置全体を機械本体よ
り外し、更に、現像装置を解体し手動操作にて現像剤の
回収を行うことに比べ、大幅な作業効率の向上を図るこ
とができる。本実施例の現像剤適正化手段1000によ
れば、現像剤の収納容量は剤収納容器223の容量によ
り定まるので、現像剤の疲労等に伴う現像剤の交換間隔
を非常に長くすることは、剤収納容器223を大型化す
ることにより可能となる。また、現像剤適正化手段10
00は、現像手段10とは異なる位置において別体でユ
ニット化され、かつ、供給管111、排出管121で連
結しているだけであるので、その設置場所の制約が少な
くなり、経済的な現像剤収納容量の確保と現像剤交換の
操作品質、組み付け・調整等の生産性に対しても優れ
る。このようにレイアウト上の自由度が拡大するので、
トナー補給ユニット230についても、ユーザーのトナ
ー補給操作が行い易い位置に配置することができ、これ
と同様の利点を得ることができる。トナー補給ユニット
230は、従来より行われている着脱可能なトナーカー
トリッジ方式を用いることでトナー補給の操作性を一層
向上させることができる。その場合、トナーカートリッ
ジの形状は、現像手段10には依存しないので、トナー
補給の操作性を向上させ得ると共に、他機種間との標準
化も容易に可能となり、結果的には生産性の更なる向上
と大幅な経済効果によるコストダウンが可能となる。更
に、トナー補給ユニットを現像剤適正化手段と別体に
し、異なる位置に配置してトナーのみを該現像剤適正化
手段に移送させることもレイアウト上の自由度を広げる
意味で有効である。図5に別の実施例を示す。図1乃至
図4に示した実施例の現像手段10では現像スリーブ1
00が1個だけ用いられていたのに対し、本実施例の現
像手段10’では、図5に示すように、現像スリーブ1
00に加え、その上方にもう一つの現像スリーブ10
0’を設けている点が異なる。その他の点では現像手段
10と同じ構成であるので、同じ機能の部材には同一符
号を付し、その説明は省略する。本実施例の現像装置1
0’においても、上記現像装置10の実施例に準じて、
図示を省略してあるが、現像剤適正化手段1000を連
結して現像装置を構成する。現像剤供給部材110は、
上記複数の現像スリーブのうち、静電潜像を最初に現像
する現像スリーブである現像スリーブ100に対し、直
接的に、現像剤を供給するものであり、ここでは、現像
スリーブ100に対向させて設けている。したがって、
現像スリーブ100’に対しては現像スリーブ100を
介して現像剤が供給されることになる。このように現像
スリーブを2個、或いはそれ以上に設ける、所謂、多段
現像方式では、高速度の現像処理が可能であり、かつ、
画像のベタ部を均一に現像でき、高画質の像を得ること
が知られている。しかし、現像手段の内部での現像剤の
循環経路が複雑となり、装置が大型になるとの問題を有
している。その点、本実施例の現像装置によれば、現像
品質をより高品質に維持し、かつ、装置の大幅な簡易
化、小型化を図ることができる。図6に更に別の実施例
を示す。以上説明した現像装置は、図6に示すような回
転型現像ユニット11に対しても適用することができ
る。この回転型現像ユニット11はカラー画像形成装置
に使用される。同図において、符号80は中間転写ベル
トを示す。符号90及び91は、感光体ドラム1上のト
ナー像を中間転写ベルト80に転写する第1転写位置に
設けられた転写バイアスローラを示す。符号71は、中
間転写ベルト80上のトナー像を転写材60に再転写
(バイアス転写)する第2転写位置に設けられた転写ロ
ーラを示す。図6において、この現像手段は、感光体ド
ラム1の所定の現像位置に対向させて設けた筒状のケー
ス300内に、図2に示した現像手段10と基本的には
同じ構成の現像手段20、21、22、23を、これら
各現像手段のケース150と一体的に構成した回転支持
体301に支持させて設けたものである。現像手段20
はイエロートナー、現像手段21はシアントナー、現像
手段22はマゼンタトナー、現像手段23はブラックト
ナーをそれぞれ含む現像剤で現像を行う。各現像手段の
現像スリーブ100Y、100M、100C、100B
Kは、回転支持体301の回転中心軸Oに対して放射状
に設けられていて、回転位置の制御により、順次、感光
体ドラム1に対向位置し、静電潜像をカラートナーによ
り可視化する。この回転型現像ユニット11が具備して
いる各現像手段20〜23に対しては、それぞれ、既に
説明した現像剤適正化手段が設けられ、かつ、これに付
随して現像剤移送・循環手段が設けられる。これら、現
像剤適正化手段は回転型現像ユニットが設けられた位置
と異なる位置に各現像手段に対応して複数、不動部材に
固定配置されていて、複数の現像剤移送・循環手段を介
して上記現像手段に連結されている。各現像剤移送・循
環手段は、上記現像手段10における入口111aに準
じた各現像手段における入口と現像剤適正化手段とを結
ぶ供給路と、上記出口121aに準じた出口と現像剤適
正化手段とを結ぶ回収路と、これら現像手段、現像剤適
正化手段、供給路、回収路で構成される現像剤の循環路
に設けた現像剤移送用のポンプ、異物除去手段等を具備
する。したがって、上記供給路を通る現像剤は現像剤の
濃度及び帯電量が適正化された現像剤であり、上記排出
路を通る現像剤は上記適正化がされる前の現像剤であ
る。上記したように各現像手段は、イエロー、マゼン
タ、シアン、ブラックの各現像剤を各1色ずつ収容する
ものである。この実施例では、現像手段が4つ設けられ
ているので、これに対応して現像剤適正化手段も4つ設
けられている。異物除去手段は、上記例に準じて、フィ
ルター、静電吸着、遠心分離等により達成される。現像
手段と現像剤適正化手段間には図2に示す構成に準じて
供給管と排出管が接続されるので、全部で8本の管が存
在する。カラー現像に際し、各現像スリーブを順次感光
体ドラムに対向させるのに、回転現像ユニットを一方向
にのみ連続回転させると、各現像手段と現像剤適正化手
段とを連結する管が捩れてしまうので、これらの管とし
ては可撓性のものを使用し、一回転未満の回動量の範囲
で正転と逆転を繰り返すように制御する。この実施例に
おいて、現像剤適正化手段を現像手段と別設したことで
該現像手段の構成が簡略化され、よって、現像剤供給部
材110及び現像剤回収部材120を仕切る隔壁である
と共に、現像スリーブ100からの余剰の現像剤を現像
剤回収部材120に案内する機能を有する現像剤ガイド
部材140を含む部材に相当する部材、つまり、図2に
おけるケース150に相当する現像剤導路手段としての
部材は、回転支持体301と一体形成されている。かか
る一体化により、回転現像ユニットの製作が容易にな
る。なお、ケース150の他側端に設けられこれと共に
構成される現像剤層規制部材130は、現像スリーブと
の間隔を調節する必要があるので回転支持体301と一
体製作することはできず、長孔にねじ止めし、一体的な
構成とするに止まる。以上のように、回転型現像ユニッ
トに現像剤適正化手段を設けた場合には、図2及び図5
等に示した白黒用の単色現像手段における利点、つま
り、回転型現像ユニット部分の小型化、簡易化、低コス
ト化、現像品質及び画像品質の向上、高信頼性化、小電
力化、メンテナンス容易化、生産性の向上等の利益を一
層大巾に得ることができる。なお、図2及び図5に示し
た各実施例においては、各現像スリーブ100,10
0’の回転方向が感光体ドラム1の回転方向とその対向
部において同一方向(順方向現像と通称される)であっ
たが、これに限らず、図2及び図5に示した各現像スリ
ーブ100,100’に対して感光体ドラム1の回転方
向が逆方向(逆方向現像と通称される)であっても良
い。この場合、感光体ドラム1に対する各現像スリーブ
100,100’の摩擦力の増加により、その現像品質
が向上する利点がある。
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. First, the overall configuration of the embodiment will be described with reference to FIG. In FIG. 1, reference numeral 10 is a developing means, and reference numeral 1000 is a developer optimizing means.
The developer optimizing unit 1000 is configured as a separate unit at a position different from the developing unit 10, and has a function of optimizing the developer. This developer optimizing means 100
0 can be provided with a toner replenishing unit for replenishing new toner. The developer is circulated between the developer optimizing means 1000 and the developing means 10. This circulation is performed by the developer transfer / circulation means 500. The developing means 10 includes an inlet 111a for receiving the developer optimized by the developer optimizing means 1000, and the developing means 10
Has an outlet 121a for sending out the excessive developer used for the development to the developer optimizing means 1000. As the developer, a two-component developer including toner and carrier is used. Optimizing the developer includes adjusting the mixing ratio of the toner and the carrier to optimize the concentration and charge amount of the developer. Further, foreign matter such as paper dust mixed in the developer is removed by the foreign matter removing means in the circulation process.
The developer optimization unit 1000 includes a toner replenishing unit, a toner / carrier stirring member, and a concentration sensor as a developer concentration detecting unit. Incidentally, the developer optimization means 1000
It is also possible to additionally provide the above-mentioned foreign matter removing means and the like. The developing means 10 is a dry type and uses a two-component developer, and employs a magnetic brush developing method. The developing means 10
Can also employ a cascade development method. The developer optimizing means 1000 is arranged at a position different from that of the developing means 10, so that they are connected to each other via the developer transfer / circulation means 500. This developer transfer / circulation means 500
Has a function to circulate the developer between them, and therefore, the developer optimization means 1000 and the inlet 111.
Supply path connecting with a (path of upward arrow in FIG. 1)
And a recovery path (path of a downward arrow in FIG. 1) connecting the developer optimizing means 1000 and the outlet 121a, the developing means 10, the developer optimizing means 1000, the supply path, and the recovery path. The developer transfer pump and the foreign matter removing means are provided at arbitrary positions in the developer circulation path. The developer passing through the supply path is a developer whose developer concentration and charge amount have been optimized by the developer optimizing means 1000, and the developer passing through the collecting path has been provided to the development by the developing means 10. It is a surplus developer and a developer before being optimized. The supply passage and the recovery passage are configured by pipes. The developer transfer pump is constituted by a powder transfer screw pump, and the pump can be incorporated in the developer optimizing means 1000. According to the above overall configuration example, since the developer can be optimized and the developer optimization unit capable of providing the toner replenishing unit can be installed as a separate unit at a position different from the developing unit, Not only is the structure of the developing means very simple, but also downsizing can be achieved, the internal structure of a complicated image forming apparatus is simplified, and there is a margin in layout, so maintenance can be facilitated. Further, since the development can be always performed by the developer optimized by the developer optimizing means, the development quality is high and stable, and the image quality is high and stable. Further, the means for agitating the toner supply and the developer is separate from the developing means, and can be installed at a location apart from the image forming unit such as the developing means and the photoconductor, which is a problem in the conventional apparatus. The occurrence of toner scattering and developer scattering in the developing device is significantly reduced.
Therefore, abnormal image quality does not occur, the image quality is stable, and the maintenance interval of the apparatus becomes long, so that the reliability can be improved. Next, details of the embodiment will be described. In FIG. 2, reference numeral 1 indicates a photosensitive drum in which the electrostatic latent image carrier is formed in a drum shape. Reference numeral 50 indicates an LED (light emitting diode) array that constitutes the exposure means. Reference numeral 60 indicates a transfer material, and reference numeral 70 indicates a transfer roller. The electrostatic latent image carrier may be formed in a belt shape other than the drum. As the transfer material 60, transfer paper or the like is used. On the photoconductor drum 1, an electrostatic latent image is formed by charging by a conventionally known electrophotographic image forming process and irradiating a light image P by an LED (light emitting diode) array 50 to perform exposure. This electrostatic latent image is visualized by the developer provided by the developing means 10 adopting the magnetic brush developing method by the well-known dry two-component developing method. Here, it goes without saying that the developing means 10 includes the developing sleeve 100 which is a direct means for supplying the developer to the photosensitive drum 1, but the developing means 10 here is the developing sleeve 100. A unit including a developer supply member 110, a developer recovery member 120, a developer layer restriction member 130, a passage means, and a case 150 for accommodating and holding these members, which are provided around the periphery. Developing sleeve 10
Reference numeral 0 has a known configuration including a sleeve and a magnet provided in the sleeve. The developing means 10 is around the photosensitive drum 1 which rotates in the direction of the arrow in the figure, and is at the exposure position where the latent image is formed by irradiating the optical image P and the toner image which visualizes the latent image is transferred onto the transfer material 60. 2 is a developing position between the transfer position and a transfer position where a transfer roller 70 for bias transfer is provided.
Are arranged so as to face the photoconductor drum 1, and are rotated so as to move in the same direction as the photoconductor drum 1 at a portion where the photoconductor drum 1 is close to the photoconductor drum 1. The photosensitive drum 1 is shown in FIG.
Has a length in the direction of penetrating the paper surface, and if this length direction is referred to as the width direction of the photosensitive drum 1, an image is formed over this width direction. Therefore, the developing sleeve 100
Also, it is necessary to supply the developer in the width direction of the photoconductor drum 1, and the developing sleeve 100 is dimensioned in the width direction according to the photoconductor drum 1. Therefore, since it is necessary to supply the developer to the developing sleeve 100 in the width direction thereof, the developer supplying member 110 covers at least the entire area of the developing sleeve 100 in the width direction. The developer collecting member 120 collects the excess developer from the developing sleeve 100 and discharges it to the outside of the developing means 100, and like the developer supplying member 110, the developing sleeve 1
00 covers the entire width direction. In the present embodiment, as shown in FIG. 2, the developer supply member 110 is provided around the developing sleeve 100, and at the position of 5:30 when viewed from the axial direction of the developing sleeve 100, the developer collecting member 120 is Three
They are provided at the respective positions in the half hour, and both are configured as a transfer means using a screw, and the developer is introduced into the inlet 111a and the outlet 1 by a driving means (not shown).
21a (shown in FIGS. 3 and 4) is rotated so as to be fed out. In FIG. 2, below the right side of the developing sleeve 100, a case 150 having upper and lower two-stage U-shaped portions is provided. A developer collecting member 120 that collects the excess developer from the developing sleeve 100 is housed in the upper U-shaped portion of the case 150. On the other hand, in the lower U-shaped portion of the case 150, the developer supply member 11 that supplies the developer to the developing sleeve 100.
0 is stored. The case 150 between the U-shaped portions extends above the developer supply member 110 and the developer recovery member 120, and the upper end thereof is close to the outer peripheral surface of the developing sleeve 140. Are integrally formed. The developer guide member 140 is a partition wall that partitions the developer supply member 110 and the developer recovery member 120, and has a function of guiding the excess developer from the developing sleeve 100 to the developer recovery member 120. The lid 1 is provided above the developing sleeve 100 and the developer collecting member 120.
60 is provided, and the base end portion of the lid 160 is openably and closably provided on the upper end of one side of the case 150 on the developer collecting member 120 side. The lid 160, the upper portion of the developer guide member 140, and the case 150 form a conduction path R that sends the excess developer from the developing sleeve 100 to the developer recovery member 120. In FIG. 2, the developer layer regulating member 130 is arranged around the developing sleeve 100 and between the developer supplying member 110 and the developing position. The developer layer regulating member 130 is a so-called doctor, the base end side of which is fixed to the other end of the case 150, and the free end side of which is closely opposed to the developing sleeve 100. It has a function of scraping off the developer on the developing sleeve, regulating the layer thickness, and collecting the scraped developer. As described above, the developer supply member 1
Reference numeral 10 is provided around the developing sleeve 100, between the developer layer regulating member 130 and the developer collecting member 120, and at a position below the developing sleeve 100. Excess developer at the time of development is the developing sleeve 1
00, the developing sleeve 100 is rotated in the direction of the arrow in the drawing, which is the rotating direction of the developing sleeve 100, and a portion thereof is scraped off while being guided by the developer guide member 140 through the conduction path R and the developer collecting member 120. Be led to. In FIGS. 3 and 4, the widthwise ends of the developing sleeve 100 in the case 150 are closed by the side plates 101. Side plate 10 on one end side
Part 1 projects in a cylindrical shape to form a circular hole for accommodating the screw portion of the developer supply member 110 and the developer recovery member 120, and the developer is supplied to the circular hole formed in this cylindrical portion. The screw parts of the member 110 and the developer collecting member 120 are fitted into each other. Further, the end shafts of the respective screw parts are covered with the lid members 101a, 1a, 1
It is pivotally supported by 01b. Further, an inlet 111a and an outlet 121a are provided in the middle of each of these circular holes in a direction orthogonal to the circular holes. The inlet 111a is the developer discharge port 206 of the developer optimizing means 1000 shown in FIGS. 1 and 2, the outlet 121a is the developer inflow port 225 of the developer optimizing means 1000, and the supply pipe 111 serving as a supply path. , Are connected by a recovery pipe 121 as a recovery path. With this configuration, the developing device 1 is connected to the developing device 1 through the supply pipe 111 from the developer discharge port 206 of the developer optimizing device 1000.
The developer transferred to the 0 inlet 111a is further transferred by the developer supply member 110 in parallel with the developing sleeve 100, and the pressure-feeding force from the powder pump unit 200 described later is added to the transfer force associated with the transfer. Developer layer regulating member 1
It is sent to the entire surface of the developing sleeve 100 via 30. At this time, the developer is made to have an optimum developing layer thickness by the developer layer regulating member 130 and is provided for development. Developer layer regulating member 1
The developer scraped off by 30 is also an excess developer at the time of development, and this developer is returned to the developer supply member 110. Further, the developer, which has been applied to the photosensitive drum 1 but has not adhered to the electrostatic latent image portion, is a surplus developer at the time of development, and passes through the conduction path R and the developer guide member 1
While being guided by 40, a part thereof is scraped off and guided to the developer collecting member 120. The developer introduced to the developer collecting member 120 is discharged by the developer collecting member 120 to the outlet 121.
a through the discharge pipe 121 and the developer optimization means 1000
Sent to. According to the above-described embodiment, the developing means 10 need only drive the developing sleeve 100, the developer supply member 110, and the developer collecting member 120 to drive the developing means 10. Therefore, the structure of the developing means described in the above example. Further simplification and size reduction can be achieved, and high reliability, power saving, and easy maintenance can be achieved. Hereinafter, an example of the developer optimizing means and the pump as the developer transferring / circulating means will be described with reference to FIG. 7. In FIG. 7, the developer discharged from the developing means 10 is guided to the developer optimizing means 1000 from the developer inflow port 225 via the discharge pipe 121. In FIG. 7, reference numeral 220 denotes a developer stirring unit, which has a cylindrical lower portion and an upper funnel-shaped agent storage container 223 and a drive motor 22 inside the container.
It is constituted by a stirring screw 221 rotated by 2. A toner outlet 235 and a developer inlet 225 of the toner replenishing unit 230 are provided above the agent storage container 223.
Is open. The toner supply unit 230 has a lid 23
0a is opened so that new toner 231 can be appropriately supplied, and a toner outlet 235 provided below the toner outlet 235.
A toner supply member 232 is provided so as to close the above. The toner supply member 232 is formed by forming a large number of notches along the rotation axis direction on the peripheral surface of a cylindrical portion that is rotationally driven, and the toner in the notches is rotated by the toner supply member 232. It has a function of supplying to the agent storage container 223. The developer discharge port 206 is located below the developer optimizing means 1000, but a developer concentration detecting member 240 is provided in the middle of the developer passage 270 near the developer outlet 206, and A toner supply member 232 is rotated by a signal from a conventionally known developer concentration detection control circuit shown in the figure, and the toner 231 in the toner replenishing unit 230 is supplied into the agent storage container 223. In this way, the new toner 231 that is replenished while being controlled by the toner replenishing unit 230 is added to the developer collected from the developing unit 10, so that the developer agitating unit 220 reduces the developer concentration and the charge amount. The optimization is performed so as to have the optimum conditions for development.
The developer thus optimized is sent to the powder pump unit 200 located below the developer stirring unit 220. The powder pump unit 200 has a conventionally known structure called a screw pump, that is, a so-called mono pump. This pump includes a rotor 201 connected to the above-mentioned drive motor 222 via a stirring screw 221, and a stator 202 made of an elastic material such as a rubber material and surrounding the rotor 201.
Upper pump holder 20 that holds this status 202
3u, lower pump holder 203d and the like. The upper pump holder 203u is used for the powder pump unit 200.
And the developer stirring unit 220 are connected. As described above, the developer passage 270 is provided below the lower pump holder 203d, and the outlet of the screw pump and the developer discharge port 206 are provided through the developer passage 270.
And are in communication. A lower air supply port 205 is provided on the developer passage 270 and at the outlet of the screw pump, that is, at a position near the lower end of the rotor 201. The lower air supply port 205 is connected to the developer passage 270.
Is in communication with. On the other hand, on the upper pump holder 203u, at a position near the inlet of the powder pump unit 200, the upper air supply port 204 communicating with the agent storage container 223 is provided.
Is provided. The outer sides of the upper air supply port 204 and the lower air supply port 205 are respectively provided with two air discharge ports 208 provided in a part of a fan case accommodating a fan 207 rotated by a drive motor 222.
And communicates via a pipe. When the drive motor 222 rotates, the fan 207 draws in air from the outside and blows air to the developer through the upper air supply port 204 and the lower air supply port 205 at a blowing rate of about 0.5 to 2 liters / minute. Blow in. This promotes fluidization of the developer, and ensures more reliable transfer with the screw pump. The amount of air supplied is very small, and after contributing to the transfer of the developer,
It escapes from the gap of the developing means 10 to the outside. In the example shown in FIG. 7, the fan 207 is mounted coaxially with the drive motor 222, but this configuration is not used, but a separate pump is provided and air is supplied to the upper and lower air supply ports 204 and 205. It is also possible to supply. Powder pump unit 20
The developer having passed 0 is detected by the developer concentration detecting member 240, the developer concentration is discharged from the developer discharge port 206, and is sent to the developing means 10 from the inlet 111a via the supply pipe 111. In this example, as shown in FIG. 2, since the developer optimizing means 1000 is located below the developing means 10, the force of the pump must be used from the developer optimizing means 1000 to the developing means 10. Although the developer cannot be sent out, the pump means is not necessary because the developer is transferred from the developing means 10 to the developer optimizing means 1000 using gravity. When the positional relationship between the developing means and the developer optimizing means is opposite to the above, or when the developing means and the developer optimizing means are arranged at substantially the same height position, etc. Deploy a pump as appropriate. Between the developing means 10 and the developer concentration optimizing means 1000, for example, the discharge pipe 121.
It is effective to improve the development quality by providing a removing means for removing foreign matter mixed in the developer, for example, paper dust, in the middle of the process or in the middle of the supply pipe 111. As the removing means, a means such as a filter, electrostatic adsorption or centrifugal separation is appropriately selected and adopted. A known screw pump called a MONO pump used in the present embodiment is a rotary positive displacement type and is a pressure transfer type transfer, and since it is transferred at a high solid-gas ratio by an extremely small amount of air, it is a development process made of powder. The agent fills the supply pipe 111 and flows continuously. Therefore, it is possible to control the flow rate with high quantitativeness and high accuracy in continuous transfer, and the transfer air to be used is a very small amount of air for fluidizing the powder and maintaining a uniform flow state over the entire length of the transfer line. The amount is enough. Furthermore, since it is a low-speed, high-concentration transfer, there is no crushing of powder, only a small diameter pipe is required, there is no trouble of transfer pipe wear, there is little noise, and the structure is simple, economical and reliable. It has features such as excellent property and maintainability. In the above developing device, when the carrier deteriorates due to long-term use, it is necessary to remove all the developer from the developing device. In that case, the developer in each unit should be emptied. Optimization means 10
00, the discharge pipe 121 is removed, the end of the discharge pipe 121 is connected to a recovery container (not shown), and the drive motor 222 is driven. As a result, all the developer including the deteriorated carrier is stored in the recovery container. The developer contained in the collection container can be appropriately disposed of, such as discarded or reused. If the work of accommodating in the recovery container is performed also during maintenance such as replacement and repair of various members, there is no developer remaining in the various members, so that the developer is not scattered and the workability in the maintenance is improved. By doing this, a great improvement in work efficiency can be achieved as compared with the conventional method in which the entire developing device is removed from the machine body and the developing device is disassembled and the developer is collected manually. Can be planned. According to the developer optimizing means 1000 of the present embodiment, since the storage capacity of the developer is determined by the capacity of the agent storage container 223, it is necessary to make the developer replacement interval very long due to fatigue of the developer. This is possible by enlarging the agent storage container 223. Further, the developer optimizing means 10
00 is unitized as a separate unit at a position different from that of the developing means 10 and is only connected by the supply pipe 111 and the discharge pipe 121, so that the restrictions on the installation location are reduced and economical development is possible. It is also excellent in securing the agent storage capacity, operation quality for developer exchange, and productivity in assembly and adjustment. Since the degree of freedom in layout is expanded in this way,
The toner replenishing unit 230 can also be arranged at a position where the user can easily perform the toner replenishing operation, and the same advantages as this can be obtained. The toner replenishing unit 230 can further improve the operability of toner replenishment by using a detachable toner cartridge system which has been conventionally used. In this case, since the shape of the toner cartridge does not depend on the developing means 10, the operability of toner replenishment can be improved, and standardization with other models can be easily performed, resulting in further increase in productivity. It is possible to reduce costs due to improvement and significant economic effect. Further, it is also effective to separate the toner replenishing unit from the developer optimizing means and dispose the toner replenishing unit at a different position to transfer only the toner to the developer optimizing means in order to widen the degree of freedom in layout. FIG. 5 shows another embodiment. In the developing means 10 of the embodiment shown in FIGS. 1 to 4, the developing sleeve 1
While only one 00 is used, in the developing means 10 'of this embodiment, as shown in FIG.
00, and another developing sleeve 10 above it.
The difference is that 0'is provided. In other respects, the structure is the same as that of the developing means 10, and therefore members having the same functions are designated by the same reference numerals, and the description thereof will be omitted. Developing device 1 of this embodiment
Also in 0 ', according to the embodiment of the developing device 10,
Although illustration is omitted, the developing device is configured by connecting the developer optimizing means 1000. The developer supply member 110 is
Of the plurality of developing sleeves, the developer is directly supplied to the developing sleeve 100, which is the developing sleeve that first develops the electrostatic latent image. Here, the developing sleeve 100 is opposed to the developing sleeve 100. It is provided. Therefore,
The developer is supplied to the developing sleeve 100 ′ via the developing sleeve 100. In this way, in the so-called multi-stage development method in which two or more development sleeves are provided, high-speed development processing is possible, and
It is known that a solid portion of an image can be uniformly developed and a high quality image can be obtained. However, there is a problem that the circulation path of the developer inside the developing means becomes complicated and the apparatus becomes large. In this respect, according to the developing device of the present embodiment, it is possible to maintain the developing quality at a higher level and to greatly simplify and downsize the device. FIG. 6 shows still another embodiment. The developing device described above can also be applied to the rotary developing unit 11 as shown in FIG. The rotary developing unit 11 is used in a color image forming apparatus. In the figure, reference numeral 80 indicates an intermediate transfer belt. Reference numerals 90 and 91 denote transfer bias rollers provided at the first transfer position for transferring the toner image on the photosensitive drum 1 to the intermediate transfer belt 80. Reference numeral 71 denotes a transfer roller provided at a second transfer position for retransferring (bias transfer) the toner image on the intermediate transfer belt 80 to the transfer material 60. In FIG. 6, the developing means is basically the same as the developing means 10 shown in FIG. 2 in a cylindrical case 300 provided to face a predetermined developing position of the photosensitive drum 1. 20, 21, 22, and 23 are provided so as to be supported by a rotary support 301 which is integrally formed with the case 150 of each developing means. Developing means 20
Is a yellow toner, the developing means 21 is a cyan toner, the developing means 22 is a magenta toner, and the developing means 23 is a black toner. Developing sleeves 100Y, 100M, 100C, 100B of each developing means
K is radially provided with respect to the rotation center axis O of the rotation support 301, and is sequentially positioned opposite the photosensitive drum 1 by controlling the rotation position, and visualizes the electrostatic latent image with color toner. For each of the developing means 20 to 23 included in the rotary developing unit 11, the developer optimizing means described above is provided, and in addition, a developer transferring / circulating means is provided. It is provided. A plurality of these developer optimizing means are fixedly arranged on the immovable member corresponding to each developing means at a position different from the position where the rotary developing unit is provided, and through a plurality of developer transfer / circulation means. It is connected to the developing means. Each developer transfer / circulation means is a supply path connecting the inlet of each developing means and the developer optimizing means, which corresponds to the inlet 111a of the developing means 10, and an outlet and a developer optimizing means, which correspond to the outlet 121a. A recovery path connecting the above, a developing means, a developer optimizing means, a supply path, a developer transfer pump provided in a developer circulation path constituted by a recovery path, a foreign matter removing means, and the like. Therefore, the developer passing through the supply path is a developer whose concentration and charge amount of the developer are optimized, and the developer passing through the discharge path is a developer before the optimization. As described above, each developing means accommodates each of yellow, magenta, cyan, and black developers one by one. In this embodiment, four developing means are provided, and accordingly four developer optimizing means are also provided. The foreign matter removing means is achieved by a filter, electrostatic adsorption, centrifugation or the like according to the above example. Since the supply pipe and the discharge pipe are connected between the developing means and the developer optimizing means in accordance with the configuration shown in FIG. 2, there are a total of eight tubes. During color development, if the rotary developing unit is continuously rotated in only one direction in order to sequentially face each developing sleeve to the photoconductor drum, the tube connecting each developing means and the developer optimizing means will be twisted. Flexible tubes are used as these tubes, and control is performed so as to repeat forward rotation and reverse rotation within a range of a rotation amount of less than one rotation. In this embodiment, since the developer optimizing means is provided separately from the developing means, the structure of the developing means is simplified, and therefore, it is a partition for partitioning the developer supply member 110 and the developer collecting member 120, and A member corresponding to a member including the developer guide member 140 having a function of guiding the excessive developer from the sleeve 100 to the developer collecting member 120, that is, a developer guiding unit corresponding to the case 150 in FIG. The member is integrally formed with the rotary support 301. Such integration facilitates manufacture of the rotary developing unit. The developer layer regulating member 130 provided at the other end of the case 150 and configured together with the case 150 cannot be manufactured integrally with the rotary support 301 because the gap between the developer layer regulating member 130 and the developing sleeve needs to be adjusted. It is screwed to the hole, and it stops as a one-piece structure. As described above, when the rotary developing unit is provided with the developer optimizing means, as shown in FIGS.
The advantages of monochromatic developing means for black and white shown in the above, that is, miniaturization, simplification, cost reduction of the rotary developing unit, improvement of development quality and image quality, high reliability, low power consumption, easy maintenance It is possible to obtain more significant benefits such as improvement in productivity and productivity. In each of the embodiments shown in FIGS. 2 and 5, the developing sleeves 100, 10
The rotation direction of 0'is the same direction as the rotation direction of the photoconductor drum 1 and its opposing portion (commonly referred to as forward development), but the present invention is not limited to this, and the development sleeves shown in FIGS. The rotation direction of the photosensitive drum 1 may be opposite to 100, 100 '(commonly referred to as reverse development). In this case, there is an advantage that the developing quality is improved by increasing the frictional force of the developing sleeves 100 and 100 'with respect to the photosensitive drum 1.

【発明の効果】本発明によれば、静電潜像担持体に対向
して構成される現像手段を小型化し、構成を簡易にし、
メンテナンス時の操作性を向上した現像装置を提供する
ことができる。また、低コスト化、現像品質・画像品質
の向上、高信頼性化、小電力化及び生産性の向上を図る
こともできる。
According to the present invention, the developing means constituted so as to face the electrostatic latent image carrier is downsized, and the structure is simplified.
A developing device with improved operability during maintenance can be provided. Further, cost reduction, development quality / image quality improvement, high reliability, low power consumption, and productivity improvement can be achieved.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施例を示す現像装置の全体構成を説
明したブロック図である。
FIG. 1 is a block diagram illustrating an overall configuration of a developing device according to an exemplary embodiment of the present invention.

【図2】本発明の一実施例を示す現像装置の構成を現像
手段の断面とともに説明した図である。
FIG. 2 is a diagram illustrating a configuration of a developing device according to an embodiment of the present invention together with a cross section of developing means.

【図3】図2の現像装置の構成を現像手段の斜視図とと
もに説明した図である。
FIG. 3 is a diagram illustrating the configuration of the developing device in FIG. 2 together with a perspective view of developing means.

【図4】図4(a),(b)は、図2の現像手段の片側
における上方及び下方の部分縦断面図である。
4 (a) and 4 (b) are partial vertical cross-sectional views of an upper side and a lower side on one side of the developing means of FIG.

【図5】現像手段の別の実施例を説明した断面図であ
る。
FIG. 5 is a sectional view illustrating another embodiment of the developing unit.

【図6】現像手段の更に別の実施例を説明した断面図で
ある。
FIG. 6 is a sectional view illustrating still another embodiment of the developing unit.

【図7】現像剤適正化手段及び現像剤移送・循環手段を
示す断面図である。
FIG. 7 is a cross-sectional view showing a developer optimization unit and a developer transfer / circulation unit.

【符号の説明】[Explanation of symbols]

1 静電潜像担持体としての感光体ドラム 10 現像手段 100 現像スリーブ 110 現像剤供給部材 111a 現像手段の入口 120 現像剤回収部材 121a 現像手段の出口 130 現像剤層規制部材 500 現像剤移送・循環手段 1000 現像剤適正化手段 DESCRIPTION OF SYMBOLS 1 Photoconductor drum as an electrostatic latent image carrier 10 Developing means 100 Developing sleeve 110 Developing agent supply member 111a Developing means inlet 120 Developer collecting member 121a Developing means outlet 130 Developer layer regulating member 500 Developer transfer / circulation Means 1000 Developer optimization means

フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 G03G 21/10 Continuation of front page (51) Int.Cl. 6 Identification number Office reference number FI technical display location G03G 21/10

Claims (10)

【特許請求の範囲】[Claims] 【請求項1】静電潜像担持体に対向して配置されてい
て、上記静電潜像担持体との対向部において上記静電潜
像担持体と同一方向に回転し、トナーとキャリアとを混
合した現像剤を上記静電潜像担持体に付与し、該静電潜
像担持体上の静電潜像を現像する現像スリーブを有する
現像手段を具備した現像装置において、 上記現像手段とは異なる位置に別体のユニットとして構
成された、現像剤を適正化する現像剤適正化手段と、該
現像剤適正化手段から上記現像手段に適正化された現像
剤を供給し、かつ、上記現像手段から上記現像剤適正化
手段に現像に付与された残りの余剰現像剤を回収する現
像剤移送循環手段とを有し、 上記現像手段が、 上記現像スリーブに対して現像剤を供給する現像剤供給
部材と、 上記現像スリーブのまわりであって上記現像剤供給部材
と現像位置との間に配置された現像剤層規制部材と、 上記現像スリーブからの余剰の現像剤を回収する現像剤
回収部材と、 上記現像剤適正化手段により適正化された現像剤を受け
入れる入口と、 上記現像剤回収部材により回収された現像剤を上記現像
剤適正化手段へ送り出す出口と、 を具備したことを特徴とする現像装置。
1. A toner and a carrier which are arranged so as to face the electrostatic latent image bearing member and rotate in the same direction as the electrostatic latent image bearing member at a portion facing the electrostatic latent image bearing member. A developing device provided with a developing sleeve for developing a latent electrostatic image on the electrostatic latent image bearing member by applying a developer mixed with the developing agent to the electrostatic latent image bearing member. Is a separate unit at a different position, which is a separate unit for optimizing the developer, and which supplies the optimized developer from the developer optimizing unit to the developing unit, and And a developer transfer / circulation means for collecting the remaining excess developer applied to the development from the developing means to the developer optimizing means, wherein the developing means supplies the developer to the developing sleeve. Between the developer supply member and the developing sleeve. And a developer recovery member disposed between the developer supply member and the developing position, a developer recovery member for recovering the excess developer from the developing sleeve, and the developer optimization means for optimizing the developer layer. A developing device comprising: an inlet for receiving the developed developer; and an outlet for sending the developer collected by the developer collecting member to the developer optimizing means.
【請求項2】請求項1記載の現像装置において、上記現
像剤供給部材が、上記現像剤層規制部材と上記現像剤回
収部材との間であり、かつ、上記現像スリーブの下方位
置に設けられていることを特徴とする現像装置。
2. The developing device according to claim 1, wherein the developer supplying member is provided between the developer layer regulating member and the developer collecting member and is provided below the developing sleeve. Developing device.
【請求項3】静電潜像担持体に対向して配置されてい
て、上記静電潜像担持体との対向部において上記静電潜
像担持体と逆方向に回転し、トナーとキャリアとを混合
した現像剤を上記静電潜像担持体に付与し、該静電潜像
担持体上の静電潜像を現像する現像スリーブを有する現
像手段を具備した現像装置において、 上記現像手段とは異なる位置に別体のユニットとして構
成された、現像剤を適正化する現像剤適正化手段と、該
現像剤適正化手段から上記現像手段に適正化された現像
剤を供給し、かつ、上記現像手段から上記現像剤適正化
手段に現像に付与された残りの余剰現像剤を回収する現
像剤移送循環手段とを有し、 上記現像手段が、 上記現像スリーブに対して現像剤を供給する現像剤供給
部材と、 上記現像スリーブのまわりであって上記現像剤供給部材
と現像位置との間に配置された現像剤層規制部材と、 上記現像スリーブからの余剰の現像剤を回収する現像剤
回収部材と、 上記現像剤適正化手段により適正化された現像剤を受け
入れる入口と、 上記現像剤回収部材により回収された現像剤を上記現像
剤適正化手段へ送り出す出口と、 を具備したことを特徴とする現像装置。
3. A toner and a carrier, which are arranged so as to face the electrostatic latent image carrier and rotate in the opposite direction to the electrostatic latent image carrier at a portion facing the electrostatic latent image carrier. A developing device provided with a developing sleeve for developing a latent electrostatic image on the electrostatic latent image bearing member by applying a developer mixed with the developing agent to the electrostatic latent image bearing member. Is a separate unit at a different position, which is a separate unit for optimizing the developer, and which supplies the optimized developer from the developer optimizing unit to the developing unit, and And a developer transfer / circulation means for collecting the remaining excess developer applied to the development from the developing means to the developer optimizing means, wherein the developing means supplies the developer to the developing sleeve. Around the developing agent supply member and the developing sleeve The developer layer regulating member arranged between the developer supplying member and the developing position, the developer collecting member for collecting the excessive developer from the developing sleeve, and the developer optimizing means for optimizing the developer. A developing device comprising: an inlet for receiving the developer, and an outlet for sending the developer collected by the developer collecting member to the developer optimizing means.
【請求項4】請求項3記載の現像装置において、 上記現像剤供給部材が、上記現像剤層規制部材と上記現
像剤回収部材との間であり、かつ、上記現像スリーブの
下方位置に設けられていることを特徴とする現像装置。
4. The developing device according to claim 3, wherein the developer supplying member is provided between the developer layer regulating member and the developer collecting member and is provided below the developing sleeve. Developing device.
【請求項5】請求項1記載の現像装置において、 上記現像スリーブが複数設けられていることを特徴とす
る現像装置。
5. The developing device according to claim 1, wherein a plurality of the developing sleeves are provided.
【請求項6】請求項1記載の現像装置において、 上記現像スリーブが複数設けられ、そのうちの1つの現
像スリーブに対してのみ上記現像剤供給部材が、現像剤
を供給することを特徴とする現像装置。
6. The developing device according to claim 1, wherein a plurality of the developing sleeves are provided, and the developer supplying member supplies the developer only to one of the developing sleeves. apparatus.
【請求項7】請求項6記載の現像装置において、 上記現像スリーブは2つ、上記現像剤供給部材は1つ用
いられており、上記現像剤供給部材はこれらの現像スリ
ーブのうち、静電潜像を最初に現像する現像スリーブに
対して、現像剤を供給することを特徴とする現像装置。
7. The developing device according to claim 6, wherein two developing sleeves are used and one developing agent supplying member is used, and the developing agent supplying member is one of these developing sleeves. A developing device characterized in that a developer is supplied to a developing sleeve for developing an image first.
【請求項8】請求項1記載の現像装置において、 現像手段は回転中心軸に対して放射状に複数設けられて
おり、回転位置の制御によりこれら各現像手段の現像ス
リーブを上記静電潜像担持体に順次対向位置させて現像
する回転型現像ユニットの一部として構成されているこ
とを特徴とする現像装置。
8. The developing device according to claim 1, wherein a plurality of developing means are provided radially with respect to a central axis of rotation, and the developing sleeves of these developing means are carried by the electrostatic latent image bearing by controlling the rotational position. A developing device, which is configured as a part of a rotary developing unit that sequentially develops by facing the body.
【請求項9】請求項8記載の現像装置において、 各現像手段は、イエロー、マゼンタ、シアン、ブラック
の各現像剤を各1色ずつ収容してなるものであることを
特徴とする現像装置。
9. The developing device according to claim 8, wherein each of the developing means contains one of each of yellow, magenta, cyan and black developers.
【請求項10】請求項8において、各現像手段の現像剤
供給部材と現像剤回収部材との間には現像剤導路手段が
設けられていて、これらの各現像剤導路手段が、一つの
部材で一体的に形成されていることを特徴とする現像装
置。
10. A developer guiding means is provided between the developer supplying member and the developer collecting member of each developing means, and each of these developer guiding means is A developing device, which is integrally formed of two members.
JP6016798A 1994-02-10 1994-02-10 Developing device Pending JPH07225512A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6016798A JPH07225512A (en) 1994-02-10 1994-02-10 Developing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6016798A JPH07225512A (en) 1994-02-10 1994-02-10 Developing device

Publications (1)

Publication Number Publication Date
JPH07225512A true JPH07225512A (en) 1995-08-22

Family

ID=11926180

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6016798A Pending JPH07225512A (en) 1994-02-10 1994-02-10 Developing device

Country Status (1)

Country Link
JP (1) JPH07225512A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007322915A (en) * 2006-06-02 2007-12-13 Ricoh Co Ltd Developing device and image forming apparatus
JP2008026408A (en) * 2006-07-18 2008-02-07 Ricoh Co Ltd Development device, image forming apparatus, toner and carrier
JP2011059417A (en) * 2009-09-10 2011-03-24 Ricoh Co Ltd Developing device and image forming apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007322915A (en) * 2006-06-02 2007-12-13 Ricoh Co Ltd Developing device and image forming apparatus
US8041269B2 (en) 2006-06-02 2011-10-18 Ricoh Co., Ltd. Development apparatus having two developer bearers and two development chambers
JP2008026408A (en) * 2006-07-18 2008-02-07 Ricoh Co Ltd Development device, image forming apparatus, toner and carrier
JP2011059417A (en) * 2009-09-10 2011-03-24 Ricoh Co Ltd Developing device and image forming apparatus

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