JPS61201278A - Developing device for electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To facilitate color changing operation and to reduce cost by providing a shutter which cuts off the circulation path in a developing container and is displaced between the peripheral part of a developing sleeve and a hopper part, and supplying toner of different color to the peripheral part of the developing sleeve while the circulation path is cut off by the shutter. CONSTITUTION:The shutter 20 is held at a nonoperation position shown by a solid line and an image is developed with a developer 8 of, for example, black in the hopper part 7. The when an image is developed in color other than black, color development is selected on a console panel with a switch and then the shutter 20 is displaced to a position shown by a chain line to cut off the circulation path of a developer returning from the hopper part to the hopper part through the periphery of the developing sleeve. In this state, the sleeve 5 is rotated to remove black toner in the developer circulating at the periphery of the developing sleeve and then a color toner supply screw 21 is rotated to start supplying a developer of color toner around the sleeve 5. Consequently, the arrangement and members in a black copying machine are diverted to take a color copy at low cost.

Description

【発明の詳細な説明】 この発明は主に色換え可能な単色電子写真複写機の現像
装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a developing device for a color-changeable monochrome electrophotographic copying machine.

従来技監　・　　　　　　　　　　　　　　□′熾近、
コピアの色を黒ばかりでなく、他の有彩色ρ、例えば、
青１１、セピア、赤等のいずれかの好みの負でも複写す
ることのできる単色複写機が世に出ているシ、・　　　
　。Conventional Technical Supervisor ・ □′ Teruchika,
The color of the copier is not only black, but also other chromatic colors ρ, for example,
There are single-color copying machines on the market that can make copies in any color you like, such as Blue 11, Sepia, or Red.
.

、コＢ＝−色の色換えの方法としては、現像ユニットの
交換方式が一般的である。この方式は通常使用されてい
る黒用現像ユニットをコピーしたい色の専用の現像分ニ
ットに交換し、色コピー終了後もとの状態、に戻すシの
であるが、この方式では着脱時、のトナーの飛散今〔よ
る・機内、操作者の汚染、操作のりずられしさの他、現
在装着されている現像ユニツ、トの色を機外から判るよ
うに表示する手段が複雑になる欠点がある。さらに、現
像ユニツ・トを機、外、に出すため、現像ユニット内へ
の塵埃の侵入、現像剤の偏倚、スリーブの磁力によるグ
リップやクヒ等磁性体の嘩着による現像剤寿命の低　　
、下、像異常、′感光体の損傷に起因する信頼性の低下
を招く欠点がある。, B = - A common method for changing colors is to replace the developing unit. In this method, the normally used black developing unit is replaced with a dedicated developing unit for the color you want to copy, and after the color copying is completed, it is returned to its original state. In addition to the contamination of the inside of the machine and the operator, and the difficulty of operating the machine, there are disadvantages in that the means for displaying the color of the currently installed developing unit so that it can be seen from outside the machine is complicated. Furthermore, since the developing unit is taken out of the machine, dust may enter the developing unit, the developer may be biased, and the life of the developer may be shortened due to the grip of the sleeve's magnetic force or the sticking of magnetic materials such as wood.
, below, there are drawbacks such as image abnormalities and reduced reliability due to damage to the photoreceptor.

上記の点を改善したものとしては、感光体に沿°て黒と
そ′）豊の有！色の１！又番よ複数個の、現像ユニット
をあらかじめ一内に設置した複写機が提゛　案され、操
作パネル上のスイッチの切換えのみでコピー色の使い分
が容易となったが、この方式は現像ユニットを複数個設
ける必要があるため、装置が大型化、し、ニス１アツプ
、力）避けられず、逆に云えば、最も使用額、、度の多
い黒用現像ユニットが小さくなり、黒色コピー”の現像
剤トナーの交換や補給の頻度が増加゛する、あるいは画
像に濃度むら゛が発生する噂の欠点が生じやすくなる。An improvement on the above points is that there is a lot of black along the photoconductor! Color 1! In addition, a copying machine was proposed in which multiple developing units were installed in advance, making it easy to use different copy colors by simply flipping a switch on the operation panel; Because it is necessary to install multiple units, the device becomes larger, which increases the amount of varnish, and the amount of power required).Conversely, the black developing unit, which is used the most, becomes smaller, making it easier to print black copies. The frequency of replacing and replenishing the developer toner increases, or the rumored problem of uneven density in images is more likely to occur.

目　　　的 本発明は、従来公知の色換え可能な単色電子写真複写機
の上述の欠点、難点にかんがみ、従来の白黒複写機の現
像装置と寸法的に殆んど変化がなく、複写機全体の部分
の寸法、配置の変更を極力　゛少な・くし、しかも色換
え操作が容易な比較的低コストの色換え可能な単色複写
機を提供することを口重とする。Purpose of the present invention In view of the above-mentioned drawbacks and difficulties of conventionally known color-changeable monochrome electrophotographic copying machines, the present invention has been developed to provide a method for improving the overall size of the copying machine, with almost no difference in dimensions from the developing device of a conventional black-and-white copying machine. The aim is to provide a comparatively low-cost monochromatic copying machine capable of color changing, which minimizes changes in the dimensions and arrangement of parts, and facilitates color changing operations.

、碧−コ又 本発明は上記目的を達成させるため、表面又は内部に磁
石を有する現像ユヨットと、１−ナーとキャリアとから
成る二成分現像剤を貯溜し該現像剤を前記現像スリーブ
に供給する手段を設けた′ホッパー部とを、現像容器内
部に有して成り、上記現像スリーブが上記現像剤供給手
段により供給された現像剤を保持搬送して感光体上の潜
像にトナーを供給して現像を行ない、現像後の現像剤を
ホツ゛パ一部に戻して循環させるようにした電子写真複
写機の現像装置において、現像容器内の上記、循環経路
を遮断し、現像容器内を現像′スリーブ周囲部とホッパ
ー部との２室に分割する位置と゛この位置より退避し現
像部の上記−環を許容する□位置とめ間に変位可能なシ
ャッタを設けるとともに、上記シャッタにより分割され
た状態で上記現像スリーブ周囲部へホッパー部に貯溜さ
れた現像剤と異る色のトナーを供給するトナー補給手段
を設けた□ことを特徴とする。　　　　　　・・　　　
□以下、本発明を図面に基いて詳細に説明する。In order to achieve the above object, the present invention stores a two-component developer consisting of a developing unit having a magnet on its surface or inside, a 1-ner and a carrier, and supplies the developer to the developing sleeve. The developing sleeve has a hopper section provided inside the developing container, and the developing sleeve holds and conveys the developer supplied by the developer supplying means to supply the toner to the latent image on the photoreceptor. In the developing device of an electrophotographic copying machine, the developer after development is returned to a part of the hopper and circulated. A movable shutter is provided between the position where the sleeve is divided into two chambers, the peripheral part of the sleeve and the hopper part, and the position where it is retracted from this position to allow the above-mentioned ring of the developing part. The present invention is characterized in that a toner replenishing means is provided for supplying toner of a different color from the developer stored in the hopper to the surrounding area of the developing sleeve.・・・
□Hereinafter, the present invention will be explained in detail based on the drawings.

・、゛説明の都合上、本発明の詳細な説明に先立ち、一
般的な色換えを行なわない単色複写機め２成分現像装置
の１例を第２図により説明する。′−；　□・現像ユニ
ットｌは感光体ドラム２に対向し先部分と□、・その反
対側の上部とに感光体ド゛弓ム□ンの軸方向全長にわた
る開口３’ａ、’Ｌｂを宥する呪癲容器３内に、上記開
口３ａを介して感光体ドラム′２に所定の現像ギャップ
を隔て〜対向し１、内部に容□器３に固定された磁石４
を有゛じ、矢印方向に回転可能な現像スリニブ５と、１
像スリーブ５め感光体ドラム２と反対側の容器底部に近
接して回転可能に設けら・れたパドルホイール６を設け
、該パドルホイール′６の周囲の現像剤台溜スペース（
氷′ツ□；（一部）Ｎこ、トナーとキルリヤとから成る
・〉成分現像剤８が充填され、開目３ｂにトナータンク
９を接続して構成されている□１−トナータンク９め１
出口には周囲に軸方向に伸びる複数本の溝を設けたトナ
ー補給ローラ１０が取付けられている。現像スリーブ５
周囲の容器壁の現像位置より上流側には、現像スリーブ
により搬送される現像剤の層厚規制用ドクター１１が設
けられており、キの背後のパドルホイール６の上部には
斜方向に配置されたフレシト２と、撹拌スクリュー１３
とより成る現像剤撹拌装置が設けられている。感光体ド
ラム２の周囲が現像部へ入る位置には、入ロシニル１６
が設けちれそいる現像時、スリーブ５及びパドルホイー
ル６が同時に反時計方向に回転す８戸、ホジパ二部７に
貯溜された現像剤８はパドルホイール６の翼１こよって
スリーブ５上に送られ、゛・ドクター・ｌｉで層厚を規
制され、一定量が感光体ドラム会料去稜會る現像部に搬
送されミ　トナーが感光体ドラム“〉上の潜像に供給さ
れ現像が輯なわれる。For convenience of explanation, an example of a two-component developing device for a single-color copying machine that does not perform a general color change will be explained with reference to FIG. 2, prior to a detailed explanation of the present invention. '-; □・Developing unit l has openings 3'a, 'Lb that extend over the entire axial length of the photoreceptor drum 2 at the front end facing the photoreceptor drum 2 and □, and at the upper part on the opposite side. A magnet 4 is placed in the container 3 to be disposed of, facing the photoreceptor drum '2 through the opening 3a with a predetermined developing gap therebetween, and a magnet 4 fixed to the container 3 inside.
a developing sleeve nib 5 rotatable in the direction of the arrow;
Image sleeve 5 A paddle wheel 6 is rotatably provided in close proximity to the bottom of the container on the opposite side of the photoreceptor drum 2, and a developer storage space (
1-Toner tank 9 is filled with component developer 8 consisting of toner and Kiriya, and is configured by connecting toner tank 9 to opening 3b. 1
A toner supply roller 10 having a plurality of grooves extending in the axial direction around its circumference is attached to the outlet. Developing sleeve 5
A doctor 11 for regulating the layer thickness of the developer conveyed by the developing sleeve is provided upstream of the development position on the surrounding container wall, and a doctor 11 is arranged diagonally above the paddle wheel 6 behind the door. Frescito 2 and stirring screw 13
A developer stirring device is provided. At the position where the periphery of the photoreceptor drum 2 enters the developing section, there is rosinyl 16.
During development, the sleeve 5 and paddle wheel 6 rotate counterclockwise at the same time, and the developer 8 stored in the second part 7 of the paddle wheel 6 is transferred onto the sleeve 5 by the blade 1 of the paddle wheel 6. The layer thickness is regulated by the doctor li, and a certain amount is conveyed to the developing section where the toner is removed from the photoreceptor drum.The toner is supplied to the latent image on the photoreceptor drum and the development begins. be called.

ドクター・ト１で遮られた現像剤はドクター１１の背面
に沿って図において上布方向に移動し、現像剤撹拌装置
１４により幅方向に分散され、幅方向め濃度が均二化さ
れる。現像部で現像の完了した現゛像側はスリニブ５の
回転に伴われて容器５内に搬送され、スリーブ内磁石４
の一一に設けられた磁性板１５の作用で、スリーブ５の
周囲より離れて落下し、パドルホイール６の回転により
ホッパー部７に戻され、図中に矢印で示され仝、−路、
を循環すｔ・現像を重ねることｔ５よ・てトナーが消費
され・現像剤のトナー濃惨が低下すると、トナータンク
９よりトナーが補給され、現像剤のトナー濃度は常に所
定の範囲に維持される。The developer blocked by the doctor blade 1 moves toward the upper cloth in the figure along the back side of the doctor blade 11, and is dispersed in the width direction by the developer stirring device 14, so that the concentration in the width direction is made uniform. The developed image side, which has been completely developed in the developing section, is transported into the container 5 as the sleeve nib 5 rotates, and the magnet 4 in the sleeve
Due to the action of the magnetic plate 15 provided at the top, the sleeve 5 falls away from the periphery of the sleeve 5, and is returned to the hopper section 7 by the rotation of the paddle wheel 6.
When the toner is consumed and the toner concentration of the developer decreases due to repeated development t5, toner is replenished from the toner tank 9, and the toner concentration of the developer is always maintained within a predetermined range. Ru.

次に、上記構成の２成分現像ユニットを基礎にした本発
明の実施例を第１図により説明する。第２図の装置と同
じ部材に対しては同一の符号が付けられている。Next, an embodiment of the present invention based on the two-component developing unit having the above structure will be described with reference to FIG. Components that are the same as those in the device of FIG. 2 are given the same reference numerals.

本実施例の装置では、パドルホイール６と同軸的に夾ツ
バ一部７の容器壁内面に沿って揺動可能なシャ・ター２
０が軸方四の全長にわた？て設けられている。このシャ
ッター２０は、図中に実線で示す如く、その全体がホッ
パー部７の容器壁底部内面に沿った位置と、第１図中に
１点鎖線で示す如く、現像容器３内の空間をホッパー部
７と、現像スリーブ５の周囲部との２室に分割し互いに
遮断するような位置との間に変位し、その位置に保持す
ることが可能となっている。シャッター２０が鎖線で示
す遮断位置を占める場合、現像スリーブ５、とンヤッタ
ー２０外面との間には現像剤の通過生許容する適当な間
隙が出来るようになっている。ドクター１１の上流側の
スリーブ周囲部にトナーを補給可能に如くカラートナー
補給スクリ子−２１が設けられている。又、ドクター１
１で妨げられ現像剤撹拌装置ｌ、４に向う現像剤の通路
には、現像剤力）撹拌製置県４の方に移動：する、こと
は妨げず、上記のカラートナー補給スクリュ、−２１か
ら、スリーブ５のまわりの現像剤に補給さ、れなカラー
トナーの飛散−クラウドは通過できない半うな柔軟なト
ナークララ、ドシール２２が設けら、れ。In the device of this embodiment, a shutter 2 is provided which can swing along the inner surface of the container wall of the flanged part 7 coaxially with the paddle wheel 6.
0 spans the entire length of the four axis directions? It is provided. The entire shutter 20 is located along the inner surface of the bottom of the container wall of the hopper section 7, as shown by the solid line in the figure, and the space inside the developing container 3 is located along the inner surface of the bottom of the container wall of the hopper section 7, as shown by the dashed line in FIG. It is possible to move between the portion 7 and a position where the peripheral portion of the developing sleeve 5 is divided into two chambers and to block each other from each other, and to hold the developing sleeve at that position. When the shutter 20 occupies the blocking position shown by the chain line, an appropriate gap is created between the developing sleeve 5 and the outer surface of the printer 20 to allow the developer to pass through. A color toner replenishing screener 21 is provided around the sleeve on the upstream side of the doctor 11 so as to be able to replenish toner. Also, Doctor 1
1, the developer stirring device 1 is blocked by the developer agitating device 1, and the developer path toward 4 has the developer force moving toward the agitating device 4: the above color toner replenishing screw, -21 From there, a semi-flexible toner seal 22 is provided, which replenishes the developer around the sleeve 5 and prevents the scattering of colored toner from passing through.

ている。上記以外の構成は第２図に示す装置と変りはな
い。ing. The configuration other than the above is the same as the device shown in FIG.

この装置は以上の如く構成されているの・で１．、シャ
ッター２０を第１図−中実線で示す非作動位置に保持し
１、カラートナ、ニ補給スクリュー２１を伴動きす、、
りい状４讐では、１、第２図に示−ｊｑ来の現、像ユ、
日ツトと全く同様になり、ホッパー部７に貯溜された現
像剤８の色、例えば黒色で現像することができる。This device is configured as described above.1. , the shutter 20 is held in the non-operating position shown by the solid line in FIG.
In the fourth chapter of the story, 1. In Figure 2, the appearance of the coming, the statue,
The color of the developer 8 stored in the hopper section 7, for example, black, can be used to develop the image in exactly the same way as the day.

−に・ム″一部７に貯溜３れた現像剤０色　、）７（黒
色）と異る色で現像しようとする場合は、操作バネ／′
Ｊ″”″、／７５−現像ｔｔ７″′＜’ｆ７’！！択す
ザ１．１゜ｋＬ：′Ｊ″Ｕ、　＆（ｉＤｋｔ−；ｉＪ！
１ＩｆｆＬｒ＊”５．’７０７ｂ’ｈ−。- When trying to develop with a color different from 7 (black), press the operating spring /'
J″”″, /75-development tt7″′<’f7’! ! Select the 1.1゜kL:'J''U, &(iDkt-;iJ!
1IffLr*”5.'707b'h-.

われる。　　　　　　　　　　　　　　　　　　・）１
　、　　　　・□ まず、シャッター２０が第１図中に一一で、不５ず１５
．６．：を経てホッパー部に戻り循環す４．、、臀雫、
痢（１）’＠顧路゛ゝ二、１．．ｌ：ｌ’：”””’＜
）を遮断する。この状態でスリーブ周囲部を回転さ竺る
。・“とスリーブ周囲部にはドクタ、−をｌ−過しう゛
るータ１゛５けの現像剤が残る。そこで原稿露光を行な
わずに　、Ｘ　。be exposed.・)1
, ・□ First, the shutter 20 is 11 and 15 in Figure 1.
．． 6. : Returns to the hopper section through 4. ,,butt drop,
Diarrhea (1)'@Kuro゛ゝ2, 1. ．． l:l':”””'<
). In this state, rotate the circumference of the sleeve.・The developer remaining on the periphery of the sleeve after passing through the doctor and the printer remains. Therefore, without exposing the original,

感光体ドラム２を帯電器で一様帯一、゛し、黒ベハヒ：
　　　□、現像し、転写紙に転写して排出するか、５、
転写紙□を□給紙せずにクリーナーで黒べたに現像さ武
た″トナ１−をクリーニングし、これを繰返すことに、
より、　、、′現像スリーブの周囲を循環する現像剤中
の黒色ト　゛ナーは除去される。現像剤中の黒色トナー
が完全に除去されたことをセンサーにより検知するか又
は、上記の作用を一定時間行なった後、カラートナー補
給スクリュー２１を回転させ、カラートナ、３．−のス
リーブ５の回りの現像剤中の補給を開始する。カラート
ナーの帯電、撹拌均一化には一定の時間が掛るので、色
切換時間を短縮するには黒色□、　トナ下が卑全になく
な６前にカラートナーの補給□　、、を開ｔｔｔ１←方
が有利であり、色切換動作はタイマー文ゆ＄１勿の創製
度センサーにより切換前の創製゛、　：域比応じて黒°
・色トナーの回収と色トナーの補給の！　、、、１″１
”’！　　　　　　８・□１１、（＋ｅｙに：べ別、：
′の；□色に色、換えする場合は、同様の回収操゛：′
作、を°し１．１補１給スゲリユー２１から別の色のト
ナータンク・　　　１．） 、を補給す、れば１より。The photoreceptor drum 2 is uniformly charged with a charger to form a black surface:
□, Develop it, transfer it to transfer paper and discharge it, or 5.
By cleaning the transfer paper □ without feeding □ the cleaner that developed it to a solid black toner 1-, and repeating this process,
Therefore, the black toner in the developer circulating around the developing sleeve is removed. After the sensor detects that the black toner in the developer has been completely removed, or after the above action has been performed for a certain period of time, the color toner replenishment screw 21 is rotated, and the color toner is removed.3. - Start replenishing the developer around the sleeve 5. It takes a certain amount of time for color toner to be charged and stirred uniformly, so to shorten the color switching time, black □, replenish color toner before 6 when the bottom of the toner runs out □,,, openttt1← It is more advantageous to change the color, and the color switching operation uses a timer and a color sensor to change the color before switching.
・Collecting color toner and replenishing color toner! ,,,1″1
”'! 8・□11, (+ey：Bebetsu、：
′; □ If you want to change the color, use the same collection operation: ′
1. Make a different color toner tank from 1.1 Supplement 1 Supply Sugeryu 21. ) , then 1.

票、所要の枚竺のカラーコピーをとった後、ホッパ１、
″　一部÷内□に貯゛溜され゛ｈ現像剤の色（黒色）に
戻す、゛　場合は、上記の色換えと同様、感光体ドラム
２上１゛・の非画像部をベタ現像してカラートナーを回
収した後、シャッター２０を開きスリーブ５及びパドル
ホイール６を回転させてトナーホッパ９より黒色トナー
を補給して所定め現像剤濃度にす乞。−′この場合、も
との色の現像細糸黒色等の濃り゛１色で、カラニ現像剤
の量にｈｃで充分多い場合１マリ″カラートナーの回収
を行なわず、男う−曳像停止後直ちにシャッタ２０を開
紋現像剤の混合を行６うても実用上崖支えない。□前述
の如くクリニ臣ング部で回収した色トナーも現像部のｉ
トナニに戻して再使用しても差支えない□。三のように
することにより、かなり多量の仁ナーを消□費する２成
分現像装置のトナー消費を少□な゛くすることに役立つ
。After making color copies of the votes and required sheets, hopper 1,
If some of the developer is accumulated inside □ and you want to return to the developer color (black), develop the non-image area on the top of the photoreceptor drum 2 in a solid manner, as in the color change above. After collecting the color toner, open the shutter 20, rotate the sleeve 5 and paddle wheel 6, and replenish the black toner from the toner hopper 9 to reach the desired developer concentration. If the amount of developer is sufficiently high in hc for one dark color such as black, the first color toner will not be collected and the shutter 20 will be used immediately after the image is stopped. Even if a mixture of 6 is carried out, it does not support the cliff in practical terms. □As mentioned above, the color toner collected in the cleaning section is also
There is no harm in returning it to Tonani and reusing it□. By doing as above, it is possible to reduce toner consumption in a two-component developing device which consumes a considerable amount of toner.

なお、カラートナー補給スク゛リューば必ｄずしも第１
図に示す位置に限定されるもので−は６く、現像スリー
ブ上めどとでもよＶ′１が、ドクターで現像剤の量が規
制される前に充分なトナー（７）ＩＦ電が行なわれるよ
うト：なるべく上流側に設けることが望ましい。Note that the color toner replenishment screw is not necessarily the first one.
This is limited to the position shown in the figure, and V'1 can be located at the top of the developing sleeve. Sufficient toner (7) IF voltage is applied before the amount of developer is regulated by the doctor. Direction: It is desirable to install it as far upstream as possible.

羞−釆　□　　　　　　　　　；″− 以上゛の如＜、°本発明゛によれば、コピー色の変換に
際して操作者あ手や機内を汚染することがなく。As described above, according to the present invention, the operator's hands and the inside of the machine are not contaminated when copying colors are changed.

従来の単色複写機の現像ユニットｉ′と“守１′′構□
成□が殆んど変らずン機内あ配置及び部材を黒色複写機
のもの門流用子る□ことができ、比較的低コストの複写
機のカラーコピ′−１化に最適である。Developing unit i′ and “guard 1″ structure of conventional monochrome copying machine □
The internal arrangement and parts of the machine can be reused from those of the black copying machine with almost no change in construction, making it ideal for converting a relatively low-cost copying machine into a color copying machine.

【図面の簡単な説明】[Brief explanation of the drawing]

第１画は本発明の実−例を示す断面図、爾２図は従来の
単色複写機の現像部−の一例を余す断面図である。 １・・・現像ユニット　　　２・・・感光体ドラム３′
・・・現像容器　　　　４・・・磁石５五魂像スリーブ ６・・・パドルホイール（椀像側供給手麺）７・・・ホ
ッパー部　　　　８・・・２成分遍像剤′　９・・・ト
ナータンク １１・・・ドクター　　　　　２０・・・シャッター１
：ｌ゛The first image is a cross-sectional view showing an example of the present invention, and the second image is a cross-sectional view of a remaining example of the developing section of a conventional monochrome copying machine. 1...Developing unit 2...Photosensitive drum 3'
... Developing container 4 ... Magnet 5 Five-kon image sleeve 6 ... Paddle wheel (hand noodle supply on the bowl image side) 7 ... Hopper part 8 ... Two-component image forming agent' 9 ... Toner Tank 11...Doctor 20...Shutter 1
:l゛

Claims (1)

【特許請求の範囲】[Claims] 表面又は内部に磁石を有する現像スリーブと、トナーと
キャリアとから成る２成分現像剤を貯溜し該現像剤を前
記現像スリーブに供給する手段を設けたホッパー部とを
、現像容器内部に有して成り、上記現像スリーブが上記
現像剤供給手段により供給された現像剤を保持搬送して
感光体上の潜像にトナーを供給して現像を行ない、現像
後の現像剤をホッパー部に戻して循環させるようにした
電子写真複写機の現像装置において、現像容器内の上記
循環経路を遮断し、現像容器内を現像スリーブ周囲部と
ホッパー部との２室に分割する位置とこの位置より退避
し現像剤の上記循環を許容する位置との間に変位可能な
シャッタを設けるとともに、上記シャッタにより分割さ
れた状態で上記現像スリーブ周囲部へホッパ部に貯溜さ
れた現像剤と異る色のトナーを供給するトナー補給手段
を設けたことを特徴とする現像装置。The developing container includes a developing sleeve having a magnet on its surface or inside thereof, and a hopper portion provided with a means for storing a two-component developer consisting of toner and a carrier and supplying the developer to the developing sleeve. The developing sleeve holds and conveys the developer supplied by the developer supplying means, supplies toner to the latent image on the photoreceptor to perform development, and returns the developed developer to the hopper section for circulation. In the developing device of an electrophotographic copying machine, the circulation path inside the developer container is shut off, and the developer container is retracted from a position where the inside of the developer container is divided into two chambers, a peripheral area of the developing sleeve and a hopper area, and a hopper area. A movable shutter is provided between the developer and the developer at a position where the developer is allowed to circulate, and toner of a different color from the developer stored in the hopper is supplied to the surrounding area of the developing sleeve in a divided state by the shutter. A developing device characterized by being provided with a toner replenishing means.