JPH05265315A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPH05265315A JPH05265315A JP4063909A JP6390992A JPH05265315A JP H05265315 A JPH05265315 A JP H05265315A JP 4063909 A JP4063909 A JP 4063909A JP 6390992 A JP6390992 A JP 6390992A JP H05265315 A JPH05265315 A JP H05265315A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- developing
- stirring
- toner
- supply port
- 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
Links
Landscapes
- Dry Development In Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、複写機やレーザープリ
ンタ等の電子写真装置に組み込まれる現像装置に用いら
れる二成分現像剤のトナーとキャリアを十分に攪拌する
技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for sufficiently agitating a toner and a carrier of a two-component developer used in a developing device incorporated in an electrophotographic apparatus such as a copying machine or a laser printer.
【０００２】[0002]
【従来の技術】上記の現像に用いられる現像装置として
は、次のような方式のものが広く採用されている。即
ち、周方向にＮ極とＳ極とを交互に備えた環状磁石の外
周を軸回りに回転しつつ現像スリーブと、外表面に静電
潜像が形成されつつ現像スリーブの外周面に近接して移
動する像担持（形成）体とを備え、前記現像スリーブの
外周面に内側の環状磁石の磁力で現像剤を付着して回転
方向に搬送しつつ、前記現像スリーブと像担持体とが近
接する領域において、現像スリーブに付着する現像剤を
像担持体の静電潜像に飛翔付着させて現像を行うもので
ある (特開昭６２−１５７０７０号公報等参照) 。2. Description of the Related Art As a developing device used for the above-mentioned development, the following type is widely adopted. That is, the developing sleeve is rotated around the outer circumference of an annular magnet having N poles and S poles alternately in the circumferential direction, and the developing sleeve is brought close to the outer circumferential surface of the developing sleeve while an electrostatic latent image is formed on the outer surface. And a moving image carrier (former), and the developer is attached to the outer peripheral surface of the developing sleeve by the magnetic force of an inner ring magnet and conveyed in the rotation direction, while the developing sleeve and the image carrier are close to each other. In the area to be developed, the developer adhering to the developing sleeve is flying-adhered to the electrostatic latent image on the image bearing member to carry out the development (see JP-A-62-157070, etc.).
【０００３】尚、現像後は別途供給される用紙の裏面か
ら電界を加えて像担持体表面の可視状のトナー像を用紙
に転写した後、熱又は圧力を加えてトナー像を用紙に定
着させる。また、転写後現像スリーブに付着している余
分の現像剤は、掻き取られて再使用される。現像剤は、
磁性トナーからなる一成分現像剤と、非磁性トナーと磁
性キャリアとからなる二成分現像剤とに大別される。二
成分現像剤は、トナーに黒色乃至褐色の磁性体を含ませ
る必要がなく、色の鮮明なトナー像を得ることができ、
トナーの帯電制御も容易であるので、カラー複写に好適
である。After the development, an electric field is applied from the back side of the separately supplied sheet to transfer the visible toner image on the surface of the image carrier to the sheet, and then heat or pressure is applied to fix the toner image on the sheet. .. After the transfer, the excess developer attached to the developing sleeve is scraped off and reused. The developer is
It is roughly classified into a one-component developer composed of a magnetic toner and a two-component developer composed of a non-magnetic toner and a magnetic carrier. The two-component developer does not need to include a black or brown magnetic substance in the toner, and a toner image having a clear color can be obtained.
It is suitable for color copying because toner charge control is easy.
【０００４】また像担持体の静電潜像に飛翔付着させる
には、現像剤を静電潜像の帯電極性と逆極性に帯電させ
る必要がある。さらに非接触で現像剤を飛翔させるに
は、像担持体と現像スリーブとの間に交番電界を印加し
て現像バイアス電圧をかけるようにしている。したがっ
て特に二成分現像剤を使用するものでは、トナーだけを
飛翔させてトナーを補充するので、補充したトナーをキ
ャリアと十分に攪拌して帯電させないと現像ムラ、かぶ
り等の不具合を生ずる。Further, in order to fly and adhere to the electrostatic latent image on the image carrier, it is necessary to charge the developer to a polarity opposite to the charging polarity of the electrostatic latent image. Further, in order to fly the developer in a non-contact manner, an alternating electric field is applied between the image carrier and the developing sleeve to apply a developing bias voltage. Therefore, particularly in the case of using a two-component developer, the toner is repelled by flying only the toner, so that problems such as uneven development and fogging occur unless the replenished toner is sufficiently stirred with the carrier to be charged.
【０００５】[0005]
【発明が解決しようとする課題】ところで、現像装置に
は、現像剤の搬送量を薄層の0.002 〜0.1 ｇ／cm2 にし
て高速現像を行うものがある。しかし高速現像を行う場
合、現像スリーブが１本では現像剤の搬送量が足りなく
なるので、現像スリーブを２本以上にしているものもあ
るが、現像スリーブの回転方向の設定や配置等の関係で
現像に方向性が出たり各現像スリーブに供給される現像
剤の攪拌が不均一に行われたりして、また二成分現像剤
を攪拌するのに十分な攪拌時間をとりにくい構造となっ
ており、循環性をよくするためには現像剤の攪拌室を大
きくしなければならなかった。By the way, there is a developing device which performs high-speed development by setting the transport amount of the developer to 0.002 to 0.1 g / cm 2 of the thin layer. However, when performing high-speed development, the amount of developer conveyed is insufficient with one developing sleeve, so some developing sleeves have two or more developing sleeves. However, due to the setting and arrangement of the rotating direction of the developing sleeve, etc. Due to the directionality of development and uneven stirring of the developer supplied to each developing sleeve, it is difficult to take sufficient stirring time to stir the two-component developer. However, in order to improve the circulation property, the developer stirring chamber had to be enlarged.
【０００６】本発明ではこのような従来の課題に鑑みて
なされたもので、コンパクトな攪拌室で現像剤を十分に
攪拌して各現像スリーブに均一に攪拌された現像剤を供
給できるようにした現像装置を提供することを目的とす
る。The present invention has been made in view of such conventional problems, and it is possible to sufficiently stir the developer in a compact stirring chamber so as to supply the uniformly stirred developer to each developing sleeve. It is an object to provide a developing device.
【０００７】[0007]
【課題を解決するための手段】このため本発明は、トナ
ーとキャリアからなる二成分現像剤を用いて静電潜像を
非接触現像する現像装置において、静電潜像を形成した
像形成体の下方に水平に配置され、前記像形成体側から
みて夫々外側から内側に向かって互いに逆向きに回転
し、外表面に前記現像剤を薄層をなして付着させつつ前
記像形成体の表面まで搬送して非接触でトナーを飛翔さ
せる２本の現像ロールと、前記２本の現像ロールの回転
軸と平行な２つの仕切り板で仕切り、回転軸方向の一端
側にトナー供給口を有して前記２本の現像ロールから掻
き取った現像剤を回収する中央の攪拌室とその両側に位
置して前記両現像ロールに現像剤を供給する２つの攪拌
室との３つの攪拌室を形成し、且つ前記仕切り板の回転
軸方向の両端に、前記現像剤を中央の攪拌室と両側の攪
拌室との間で搬送する搬送通路を形成した攪拌槽と、現
像に使用されずに残存した現像剤と前記トナー供給口か
ら補充されたトナーとを攪拌しつつ、現像剤を中央の攪
拌室のトナー供給口側からトナー供給口側と反対端の搬
送通路、両側の攪拌室、トナー供給口側の搬送通路へと
循環させる攪拌手段と、を備えるようにした。For this reason, the present invention is directed to an image forming body having an electrostatic latent image formed in a developing device for developing the electrostatic latent image in a non-contact manner by using a two-component developer comprising a toner and a carrier. Are arranged horizontally below the image forming body and rotate in the opposite directions from the outside toward the inside as viewed from the image forming body side, and the developer is attached to the outer surface in a thin layer to the surface of the image forming body. It is partitioned by two developing rolls that convey and fly the toner in a non-contact manner, and two partition plates that are parallel to the rotation axes of the two developing rolls, and have a toner supply port on one end side in the rotation axis direction. Three stirring chambers are formed: a central stirring chamber for collecting the developer scraped from the two developing rolls and two stirring chambers located on both sides of the central stirring chamber for supplying the developer to the developing rolls, And, at both ends of the partition plate in the rotation axis direction, A stirring tank having a transport passage for transporting the developer between the central stirring chamber and the stirring chambers on both sides, and the developer remaining not used for development and the toner replenished from the toner supply port are stirred. At the same time, a stirring means for circulating the developer from the toner supply port side of the central stirring chamber to the conveying passage at the end opposite to the toner supply port side, the stirring chambers on both sides, and the conveying passage on the toner supply port side are provided. I chose
【０００８】また前記２本の現像ロールに付着させる薄
層の現像剤の量を0.002 〜0.1 ｇ／cm2 とした。Further, the amount of the thin layer developer adhered to the two developing rolls is set to 0.002 to 0.1 g / cm 2 .
【０００９】[0009]
【作用】上記の構成によれば、２本の現像ロールは回転
して外表面に薄層をなして付着する二成分現像剤を前記
像担持体の表面まで搬送して二成分現像剤のトナーを非
接触で飛翔させる。その後、残った現像剤は両回転軸の
内側で掻き取られ、攪拌槽の中央の攪拌室で回収され
る。According to the above construction, the two developing rolls rotate to convey the two-component developer, which forms a thin layer on the outer surface and adheres to the surface of the image carrier, to convey the toner of the two-component developer. To fly without contact. After that, the remaining developer is scraped off inside both rotary shafts and collected in the stirring chamber at the center of the stirring tank.
【００１０】中央の攪拌室では、残存した現像剤にトナ
ー供給口からトナーが補充される。そして攪拌手段によ
り二成分現像剤が攪拌され、攪拌手段は二成分現像剤を
中央の攪拌室のトナー供給口側からトナー供給口側と反
対端の搬送通路、両側の攪拌室、トナー供給側の搬送通
路への循環経路を搬送する。これによりトナーとキャリ
アとを攪拌される距離を長くとれるので、時間をかけて
十分に攪拌することが出来、トナーの供給が一か所で行
われ、中央の攪拌室で攪拌されたものが両側の攪拌室に
均等に分配されるので、両現像ロールに均一に攪拌され
た現像剤が供給される。In the central stirring chamber, the residual developer is replenished with toner from the toner supply port. Then, the two-component developer is agitated by the agitating means, and the agitating means transfers the two-component developer from the toner supply port side of the central agitating chamber to the conveying passage opposite to the toner supply port side, the agitating chambers on both sides, and the toner supplying side. Transport the circulation path to the transport path. As a result, the toner and the carrier can be agitated at a long distance, so that the toner can be sufficiently agitated over time, the toner is supplied at one place, and the toner agitated in the central agitating chamber is used on both sides. Since the developer is evenly distributed in the agitating chamber, the uniformly agitated developer is supplied to both developing rolls.
【００１１】特に二成分現像剤の量を薄層の0.002 〜0.
1 ｇ／cm2 としたものでも現像剤の供給、攪拌を安定し
て行え、現像ムラ等を防止できる。In particular, the amount of the two-component developer is 0.002 to 0.
Even with 1 g / cm 2 , the developer can be stably supplied and stirred, and development unevenness can be prevented.
【００１２】[0012]
【実施例】以下本発明の実施例を図に基づいて説明す
る。但し、以下の実施例に限るものではない。図１にお
いて、１は静電潜像を形成する像形成体たる可撓性の感
光体ベルトで、該感光体ベルト１は駆動ローラ２と従動
ローラ３の間に張設され、時計廻り方向に一定速度にて
搬送される。Embodiments of the present invention will be described below with reference to the drawings. However, it is not limited to the following examples. In FIG. 1, reference numeral 1 denotes a flexible photosensitive belt which is an image forming body for forming an electrostatic latent image, and the photosensitive belt 1 is stretched between a driving roller 2 and a driven roller 3 and is arranged in a clockwise direction. It is transported at a constant speed.
【００１３】４は前記感光体ベルト１の下辺部に内接す
るよう装置本体に固定したガイド部材、５は感光体ベル
ト１を緊張状態でガイド部材４に内接面させるテンショ
ンローラである。ガイド部材４及びテンションローラ５
は感光体ベルト１上に安定した画像形成面を構成するこ
とを可能としている。６は帯電手段たるスコロトロン帯
電器、また７はレーザー書込み系ユニットである。レー
ザー書込み系ユニット７には図示の光学系のものの他
に、発光部と収束性光伝送体を一体とした光学系等も使
用可能である。Reference numeral 4 is a guide member fixed to the main body of the apparatus so as to be inscribed in the lower side of the photoconductor belt 1, and reference numeral 5 is a tension roller which makes the photoconductor belt 1 inscribed on the guide member 4 in a tensioned state. Guide member 4 and tension roller 5
Makes it possible to form a stable image forming surface on the photosensitive belt 1. 6 is a scorotron charger as a charging means, and 7 is a laser writing system unit. For the laser writing system unit 7, besides the optical system shown in the figure, an optical system in which a light emitting portion and a converging optical transmission body are integrated can be used.
【００１４】８，９，10，11は異なる色の現像材、例え
ばイエロー，マゼンタ，シアン，黒色の各現像剤をそれ
ぞれ収容した複数個の現像手段たる現像装置（器）で、
該現像装置８〜11は前記ガイド部材４が内接する感光体
ベルト１に対向して配設されている。これら各現像装置
８〜11は感光体ベルト１上の（静電）潜像を非接触現像
法により顕像化する機能を有している。尚、現像装置８
〜11については後述する。Denoted at 8, 9, 10, and 11 are developing devices (containers), which are a plurality of developing means for accommodating different color developing agents, for example, yellow, magenta, cyan, and black developing agents, respectively.
The developing devices 8 to 11 are arranged so as to face the photoconductor belt 1 with which the guide member 4 is inscribed. Each of the developing devices 8 to 11 has a function of visualizing the (electrostatic) latent image on the photosensitive belt 1 by a non-contact developing method. Incidentally, the developing device 8
About 11 will be described later.
【００１５】12は転写部、12Ａは除電バー、13はクリー
ニング装置である。クリーニング装置13のブレード13Ａ
と、トナー搬送ローラ13Ｂは画像形成中には感光体ベル
ト１の表面より離間した位置に保たれ、画像転写後のク
リーニング時のみ図示の如く感光体ベルト１の表面に圧
接される。前記画像形成装置によるカラー画像形成のプ
ロセスは、次のようにして行われる。Reference numeral 12 is a transfer portion, 12A is a charge eliminating bar, and 13 is a cleaning device. Blade 13A of cleaning device 13
Then, the toner carrying roller 13B is kept at a position separated from the surface of the photoconductor belt 1 during image formation, and is pressed against the surface of the photoconductor belt 1 as shown only during cleaning after image transfer. The color image forming process by the image forming apparatus is performed as follows.
【００１６】前記感光体ベルト１は帯電器６により帯電
され、次いで図示しない信号処理部から出力された色信
号が書込み系ユニット７に入力され、ドラム表面への書
込みが行われ潜像が形成される。潜像は現像手段のうち
例えば、まずイエロー（Ｙ）のトナーの充填された現像
部８により現像されてドラム表面にトナー像が形成され
る。得られたトナー像はドラム面に保持されたまま感光
体ベルト１の周面より引き離されているクリーニング装
置13のブレード13Ａの下を通過し、次のコピーサイクル
に入る。The photoconductor belt 1 is charged by a charger 6, and then a color signal output from a signal processor (not shown) is input to a writing system unit 7 to write on the drum surface to form a latent image. It The latent image is first developed by, for example, the developing unit 8 filled with yellow (Y) toner in the developing means to form a toner image on the drum surface. The obtained toner image passes under the blade 13A of the cleaning device 13 separated from the peripheral surface of the photosensitive belt 1 while being held on the drum surface, and enters the next copy cycle.
【００１７】同様にして、マゼンタ（Ｍ）、シアン
（Ｃ）、黒色の各々のトナーを有する現像部９、10、11
により現像されてトナー像が形成される。そして、転写
器12にて感光体ベルト１の周面上に形成されたトナー画
像の転写紙への転写が行われ、除電を受けた転写紙は前
記感光体ベルト１と分離されて、上方に向かい、定着ロ
ーラ18により画像を溶着した後、排紙ローラ19を経て排
紙トレイ20上に排出される。Similarly, developing units 9, 10, and 11 having magenta (M), cyan (C), and black toners, respectively.
Is developed to form a toner image. Then, the transfer device 12 transfers the toner image formed on the peripheral surface of the photoconductor belt 1 to the transfer paper, and the transfer paper subjected to the charge removal is separated from the photoconductor belt 1 and goes upward. Then, after the image is fused by the fixing roller 18, the image is discharged onto the discharge tray 20 via the discharge roller 19.
【００１８】一方、転写紙への転写を終えた感光体ベル
ト１はさらに搬送が続けられ、ブレード13Ａとトナー搬
送ローラ13Ｂを圧接状態とした前記クリーニング装置13
において残留したトナーの除去が行われる。次に、本発
明に係る現像装置部分を詳細に説明する。尚、図２
（Ａ）はマゼンタ用の現像装置９ (他のイエロー用現像
装置８，シアン用現像装置10、黒色用現像装置11も同
様、以下マゼンタ用の現像装置９で代表して説明する)
の断面図、（Ｂ）は攪拌層の（Ａ）のＩ−Ｉ断面図を示
す。On the other hand, the photosensitive belt 1 which has finished the transfer onto the transfer paper is further conveyed, and the cleaning device 13 is brought into a state where the blade 13A and the toner conveying roller 13B are in pressure contact with each other.
Then, the residual toner is removed. Next, the developing device portion according to the present invention will be described in detail. Note that FIG.
(A) is a magenta developing device 9 (the other yellow developing device 8, cyan developing device 10, and black developing device 11 will also be described as representative of magenta developing device 9).
And (B) is a sectional view taken along line I-I of (A) of the stirring layer.
【００１９】図２（Ａ）において、50はマゼンタ用の現
像装置９の攪拌槽であって、仕切り板51−１、51−２に
よって仕切られて３つの攪拌室52−１〜３が形成されて
いる。図２（Ｂ）で示すように、この仕切り板51−１、
51−２の夫々の両端には中央の攪拌室52−２と両側の攪
拌室52−１、52−３との間を現像剤を搬送できるように
搬送通路53−１〜４を設け、中央の攪拌室52─２の回転
軸方向の一端側にはトナー供給口54が備えられている。
また攪拌槽50の各攪拌室52−１〜３には軸回りに螺旋状
の板が固着された攪拌手段である攪拌スクリュー55−１
〜３が夫々備えられ、この攪拌スクリュー55−１〜３を
回転させて螺旋状の板で二成分現像剤を攪拌しながら搬
送していく。攪拌スクリュー55−１〜３による現像剤の
搬送方向は、中央の攪拌室52−２ではトナー供給口54か
ら反対端方向に、また両側の攪拌室52−１、52−３で
は、その逆方向となっている。In FIG. 2A, reference numeral 50 denotes a stirring tank of the magenta developing device 9, which is partitioned by partition plates 51-1 and 51-2 to form three stirring chambers 52-1 to 52-3. ing. As shown in FIG. 2B, this partition plate 51-1
At both ends of 51-2, transfer passages 53-1 to 4-4 are provided so that the developer can be transferred between the central stirring chamber 52-2 and the both stirring chambers 52-1 and 52-3. A toner supply port 54 is provided at one end side of the stirring chamber 52-2 in the rotation axis direction.
Further, in each of the stirring chambers 52-1 to 52-3 of the stirring tank 50, a stirring screw 55-1 which is a stirring means in which a spiral plate is fixed around the shaft is provided.
3 to 3 are provided, and the stirring screws 55-1 to 55-3 are rotated to convey the two-component developer while stirring the two-component developer with a spiral plate. The developer is conveyed by the stirring screws 55-1 to 55-3 in the central stirring chamber 52-2 in the opposite direction from the toner supply port 54, and in the stirring chambers 52-1 and 52-3 on both sides in the opposite direction. Has become.
【００２０】現像装置９内には、感光体ベルト１の下方
に略水平に２本の現像ロール56−１及び56−２が配置さ
れている。この現像ロール56−１（56−２）は、周方向
にＮ極とＳ極とを交互に備えて回転しない環状磁石57−
１（57−２）と、この環状磁石57−１（57−２）の外周
を軸回りに回転し、環状磁石57−１（57−２）の磁力に
より表面に付着した二成分現像剤を搬送する現像スリー
ブ58−１（58−２）と、からなる。環状磁石57−１（57
−２）にはＮ又はＳ極の磁極が連続した箇所が設けら
れ、現像スリーブ58−１（58−２）上の現像剤を反発さ
せて掻き取り易くしている。掻き落とされた現像剤は中
央の攪拌室52−２で回収される。この現像スリーブ58−
１、58−２は、回転方向が夫々感光体ベルト１側からみ
て夫々外側から内側に向かって回転する互いに逆向きの
方向であり、回転速度が線速度 300mm/secで高速であっ
て二成分現像剤を感光体ベルト１の表面まで搬送する。
尚、感光体ベルト１の線速度は矢印方向に 200mm/secで
あり、線速度比は 1.5倍に設定されている。感光体ベル
ト１に対する現像スリーブ58−１（58−２）の線速度比
は 1.2〜1.8 位であることが本現像装置構成では好まし
い。In the developing device 9, two developing rolls 56-1 and 56-2 are arranged below the photosensitive belt 1 substantially horizontally. The developing roller 56-1 (56-2) has an N-pole and an S-pole alternately arranged in the circumferential direction and does not rotate.
1 (57-2) and the outer circumference of the annular magnet 57-1 (57-2) are rotated around the axis, and the two-component developer attached to the surface by the magnetic force of the annular magnet 57-1 (57-2) And a developing sleeve 58-1 (58-2) to be conveyed. Ring magnet 57-1 (57
-2) is provided with a continuous N or S magnetic pole to repel the developer on the developing sleeve 58-1 (58-2) to facilitate scraping. The scraped off developer is collected in the central stirring chamber 52-2. This developing sleeve 58-
Reference numerals 1 and 58-2 are directions opposite to each other in which the rotation directions respectively rotate from the outer side to the inner side when viewed from the photoconductor belt 1 side, and the rotation speed is high at a linear speed of 300 mm / sec and two components The developer is conveyed to the surface of the photosensitive belt 1.
The linear velocity of the photosensitive belt 1 is 200 mm / sec in the direction of the arrow, and the linear velocity ratio is set to 1.5 times. The linear velocity ratio of the developing sleeve 58-1 (58-2) to the photoreceptor belt 1 is preferably 1.2 to 1.8 in the present developing device configuration.
【００２１】前記現像スリーブ58−１、58−２には、抵
抗Ｒ−２を介して交流電源70及び直流電源71が接続さ
れ、ガイド部材４がアースに接続され、現像スリーブ58
−１及び58−２と感光体ベルト１の間に現像バイアス電
圧が印加される。本実施例の現像バイアスの条件は、画
像濃度の関係から、現像バイアスの交流成分の振幅をＶ
AC（Ｖ）、周波数をｆ（Hz）、像形成体と現像剤搬送体
との間隙をｄ（mm）とするとき、 0.4 ≦ＶAC／（ｄ・ｆ）≦1.2 の範囲内として設定する。The developing sleeves 58-1 and 58-2 have no resistance.
AC power supply 70 and DC power supply 71 are connected via anti-R-2
The guide member 4 is connected to the ground, and the developing sleeve 58
-1 and 58-2 between the photosensitive belt 1 and the developing bias voltage.
Pressure is applied. The developing bias conditions in this embodiment are as follows.
From the relationship of image density, the amplitude of the AC component of the developing bias is V
AC(V), frequency f (Hz), image forming member and developer conveying member
When the gap between and is d (mm), 0.4 ≤ VACSet within the range of / (df) ≤ 1.2.
【００２２】59−１、59−２は規制棒であり、規制棒59
−１、59−２は夫々現像スリーブ58−１、58−２に付着
した現像剤層の厚さを規制して一定の厚さにし、現像剤
搬送量が薄層である0.002 〜0.1 ｇ／cm2 、好ましくは
0.005 〜0.04ｇ／cm2 となるようにする。ここで現像剤
搬送量とは、現像剤が飛翔付着して現像される感光体ベ
ルト１の現像領域に面する部分に、現像スリーブ58が単
位時間当りに搬送してくる量を言う。現像スリーブ58−
１、58−２の回転速度が一定の場合、現像スリーブ58−
１、58−２の現像領域部分に付着された単位面積当りの
現像剤の量 (重量) で示されるが、単位面積当りの現像
剤の量が同一であっても現像スリーブ58−１、58−２の
回転速度を増大すれば、搬送量は比例的に増大すること
となる。スクレーパ60−１、60−２は夫々現像スリーブ
58−１、58−２の表面に残った現像剤を掻き落とす。Reference numerals 59-1 and 59-2 are restriction rods, and the restriction rod 59
-1 and 59-2 regulate the thickness of the developer layer attached to the developing sleeves 58-1 and 58-2 respectively to a constant thickness, and the developer transport amount is a thin layer 0.002 to 0.1 g / cm 2 , preferably
It should be 0.005-0.04 g / cm 2 . Here, the developer carrying amount means the amount of the developing sleeve 58 carried per unit time to a portion facing the developing area of the photosensitive belt 1 where the developer is flying and adheres and is developed. Development sleeve 58-
When the rotation speed of 1, 58-2 is constant, the developing sleeve 58-
It is shown by the amount (weight) of the developer per unit area attached to the developing area of Nos. 1 and 58-2. Even if the amount of the developer per unit area is the same, the developing sleeves 58-1 and 58-2 If the rotation speed of -2 is increased, the carry amount will be increased proportionally. The scrapers 60-1 and 60-2 are developing sleeves, respectively.
The developer remaining on the surfaces of 58-1 and 58-2 is scraped off.
【００２３】２本の現像スリーブ58−１、58−２と各攪
拌室52−１〜３の攪拌スクリュー55−１〜３とはギアボ
ックス61の中でギアカップリングしている。次にこのギ
アカップリングの構成を図３に基づいて説明する。図３
において、62は駆動ギアであり、63−１、63−２は夫々
現像スリーブ58−１、58−２用のギア、64−１〜３は夫
々攪拌スクリュー55−１〜３用のギアである。そして駆
動ギア62には順次ギア63−１、63−２を歯合させると共
に、順次ギア64−１〜３を歯合させる。そして駆動ギア
62を図中、矢印方向に回転させれば各ギアも図に示すよ
うに回転し、現像スリーブ58−１、58−２は共に感光体
ベルト１からみて外側から内側へ回転し、中央の攪拌ス
クリュー55−２と、攪拌スクリュー55−１、３との回転
方向が反対になる。The two developing sleeves 58-1 and 58-2 and the stirring screws 55-1 to 55-3 of the stirring chambers 52-1 to 52-3 are gear-coupled in a gear box 61. Next, the structure of this gear coupling will be described with reference to FIG. Figure 3
, 62 is a drive gear, 63-1 and 63-2 are gears for the developing sleeves 58-1 and 58-2, respectively, and 64-1 to 3 are gears for the stirring screws 55-1 to 55-3, respectively. .. Then, the drive gear 62 sequentially meshes with the gears 63-1 and 63-2, and sequentially meshes with the gears 64-1 to 64-1. And drive gear
When 62 is rotated in the direction of the arrow in the figure, the gears also rotate as shown in the figure, and the developing sleeves 58-1 and 58-2 both rotate from the outer side to the inner side when viewed from the photoconductor belt 1, and the stirring at the center. The rotation directions of the screw 55-2 and the stirring screws 55-1 and 3 are opposite to each other.
【００２４】次にこの現像装置９における攪拌作用を説
明する。図２（Ａ）において、現像ロール56−１（56−
２）には回転外側に対応する攪拌室52−１（52−３）か
ら二成分現像剤が供給され、現像スリーブ58−１（58−
２）に現像剤が付着する。この現像剤は、線速度 300mm
/secで高速回転する現像スリーブ58−１（58−２）によ
って搬送され、規制棒59−１（59−２）により薄層であ
る0.002 〜0.1 ｇ／cm2 に規制される。そして感光体ベ
ルト１に対して現像ロール56−１（56−２）を交流電源
70及び直流電源71で現像バイアスすることによりこの薄
層の現像剤中のトナーを感光体ベルト１へ飛翔させる現
像効率が高まり、高い現像効率の下で二成分現像剤のジ
ャンピング現像が行われる。この時、現像ロール56のう
ち一方が感光体ベルト１と異なる方向に回転するので方
向性のない現像を行える。現像ロール56−１（56−２）
がさらに回転すると現像スリーブ58−１（58−２）に残
存している現像剤はスクレーパ60−１（60−２）により
掻き落とされ、中央の攪拌室52−２で回収される。この
中央の攪拌室52−２では、残存した現像剤に新しいトナ
ーがトナー供給口54から補充される。このトナーはまだ
未攪拌であり、十分に帯電していない。尚、新しいトナ
ーが補充されても現像スリーブ52−１（52−１）の表面
の現像剤は薄層なので溢れることはない。そして現像剤
は図２（Ｂ）に示すように、各攪拌スクリュー55−２、
55−１によって攪拌室52−２→トナー供給口54とは反対
端の搬送通路53−１→攪拌室52−１→トナー供給口側の
搬送通路53−３→攪拌室52−２の循環経路Ｐを搬送され
る。このため未攪拌の現像剤がこの循環経路Ｐを搬送さ
れる間に十分に攪拌され、補充された非磁性トナーも磁
性キャリアと混合されることにより帯電するようにな
る。Next, the stirring action in the developing device 9 will be described. In FIG. 2A, the developing roll 56-1 (56-
The two-component developer is supplied to 2) from the stirring chamber 52-1 (52-3) corresponding to the outer side of the rotation, and the developing sleeve 58-1 (58-
The developer adheres to 2). This developer has a linear velocity of 300 mm
It is conveyed by a developing sleeve 58-1 (58-2) which rotates at a high speed of / sec, and regulated to a thin layer of 0.002 to 0.1 g / cm 2 by a regulating rod 59-1 (59-2). Then, the developing roller 56-1 (56-2) is connected to the photosensitive belt 1 by an AC power source
By developing bias with the 70 and the DC power source 71, the developing efficiency for flying the toner in the developer of the thin layer to the photosensitive belt 1 is increased, and the jumping development of the two-component developer is performed under the high developing efficiency. At this time, one of the developing rolls 56 rotates in a direction different from that of the photoconductor belt 1, so that development can be performed without directivity. Developing roll 56-1 (56-2)
When is further rotated, the developer remaining on the developing sleeve 58-1 (58-2) is scraped off by the scraper 60-1 (60-2) and collected in the central stirring chamber 52-2. In the central stirring chamber 52-2, the remaining developer is replenished with new toner from the toner supply port 54. This toner has not been stirred yet and is not sufficiently charged. Even if new toner is replenished, the developer on the surface of the developing sleeve 52-1 (52-1) does not overflow because it is a thin layer. Then, as shown in FIG. 2B, the developer is each stirring screw 55-2,
By 55-1, the stirring chamber 52-2 → the conveying passage 53-1 at the end opposite to the toner supply port 54 → the stirring chamber 52-1 → the conveying passage 53-3 on the toner supply port side → the circulation path of the stirring chamber 52-2 P is transported. Therefore, the unstirred developer is sufficiently stirred while being conveyed through the circulation path P, and the replenished non-magnetic toner is also charged by being mixed with the magnetic carrier.
【００２５】かかる構成によれば、二成分現像剤を搬送
する２本の現像ロール56−１、56−１を感光体ベルト１
側からみて夫々外側から内側に向かって互いに逆向きに
回転し、残存している現像剤と補充したトナーとを中央
の攪拌室52−２で混合し、混合した現像剤を各攪拌スク
リュー55−１〜３で攪拌しつつトナー供給口54側から中
央の攪拌室52−２、両側の攪拌室52−１、52−３を経由
させてトナー供給口54に戻る循環経路Ｐを搬送すること
により、現像剤の攪拌時間を十分に確保できるので、十
分に攪拌された現像剤を現像ロール56−１、56−２に安
定供給でき、現像ロール56−１、56−２には現像剤が均
一に付着する。したがって現像剤の安定供給・安定攪拌
が行えるので攪拌槽50の容積も低減でき、現像装置も小
型化出来る。しかも現像ロール56のうち一方が感光体ベ
ルト１と異なる方向に回転するので方向性のない現像を
行ることが出来る。また特に、線速度 300mm/secの高速
現像、現像剤搬送量が0.002 〜0.1 ｇ／cm2 の薄層であ
っても現像ムラ、かぶり、トナー飛散という不具合は発
生しない。According to this structure, the two developing rolls 56-1 and 56-1 which convey the two-component developer are connected to the photosensitive belt 1.
Rotating in the opposite directions from the outside to the inside as viewed from the side, the remaining developer and the replenished toner are mixed in the central stirring chamber 52-2, and the mixed developer is mixed with each stirring screw 55- By carrying the circulation path P returning from the toner supply port 54 side to the toner supply port 54 via the central stirring chamber 52-2 and the both side stirring chambers 52-1 and 52-3 while stirring at 1 to 3 Since the developer stirring time can be sufficiently ensured, the sufficiently stirred developer can be stably supplied to the developing rolls 56-1 and 56-2, and the developing rolls 56-1 and 56-2 can be uniformly coated with the developer. Adhere to. Therefore, since the developer can be stably supplied and stably stirred, the volume of the stirring tank 50 can be reduced and the developing device can be downsized. Moreover, since one of the developing rolls 56 rotates in a direction different from that of the photosensitive belt 1, it is possible to carry out development without directivity. In particular, problems such as uneven development, fogging, and toner scattering do not occur even in high-speed development with a linear velocity of 300 mm / sec and a thin layer having a developer transport amount of 0.002 to 0.1 g / cm 2 .
【００２６】[0026]
【発明の効果】以上説明したように本発明によれば、現
像ロールを互いに両回転軸の外側から内側へ回転させ、
残存している現像剤と補充したトナーとを中央の攪拌室
で混合し、混合した現像剤を攪拌手段により攪拌しつつ
トナー供給口側から中央の攪拌室、両側の攪拌室を経由
させてトナー供給口に戻る循環経路を搬送することによ
り、現像剤の攪拌時間を十分に確保できるので、十分に
攪拌された現像剤を現像ロールに安定供給でき、現像ロ
ールには現像剤が均一に付着する。したがって現像剤の
安定供給・安定攪拌が行えるので攪拌槽の容積も低減で
き、現像装置も小型化出来る。又、現像に方向性も生じ
ない。As described above, according to the present invention, the developing rolls are rotated from the outer side to the inner side of both rotary shafts,
The remaining developer and the replenished toner are mixed in the central stirring chamber, and the mixed developer is stirred by the stirring means from the toner supply port side to the central stirring chamber and the stirring chambers on both sides to pass the toner. By conveying the circulation path returning to the supply port, it is possible to secure a sufficient stirring time of the developer, so that the sufficiently stirred developer can be stably supplied to the developing roll, and the developer is uniformly attached to the developing roll. .. Therefore, since the developer can be stably supplied and stably stirred, the volume of the stirring tank can be reduced and the developing device can be downsized. Further, there is no directionality in the development.
【００２７】また特に、0.002 〜0.1 ｇ／cm2 の薄層で
あっても現像ムラ、かぶり、トナー飛散という不具合は
発生しない。In particular, even a thin layer having a thickness of 0.002 to 0.1 g / cm 2 does not cause problems such as uneven development, fogging and toner scattering.
【図１】本発明に係る現像剤搬送量検出装置及び搬送量
制御装置を内蔵するデジタル型カラー複写機の全体構成
を示す図FIG. 1 is a diagram showing an overall configuration of a digital type color copying machine incorporating a developer conveyance amount detection device and a conveyance amount control device according to the present invention.
【図２】同上複写機の現像装置部分を示す図FIG. 2 is a diagram showing a developing device portion of the copying machine.
【図３】図２のギアカップリングの説明図FIG. 3 is an explanatory view of the gear coupling of FIG.
１ 感光体ベルト 50 攪拌槽 51 仕切り板 52 攪拌室 53 搬送通路 54 トナー供給口 55 攪拌スクリュー 56 現像ロール 59 規制棒 60 スクレーパ 1 Photoconductor belt 50 Stirring tank 51 Partition plate 52 Stirring chamber 53 Conveying passage 54 Toner supply port 55 Stirring screw 56 Developing roll 59 Control rod 60 Scraper
Claims (2)
用いて静電潜像を非接触現像する現像装置において、 静電潜像を形成した像形成体の下方に水平に配置され、
前記像形成体側からみて夫々外側から内側に向かって互
いに逆向きに回転し、外表面に前記現像剤を薄層をなし
て付着させつつ前記像形成体の表面まで搬送して非接触
でトナーを飛翔させる２本の現像ロールと、 前記２本の現像ロールの回転軸と平行な２つの仕切り板
で仕切り、回転軸方向の一端側にトナー供給口を有して
前記２本の現像ロールから掻き取った現像剤を回収する
中央の攪拌室とその両側に位置して前記両現像ロールに
現像剤を供給する２つの攪拌室との３つの攪拌室を形成
し、且つ前記仕切り板の回転軸方向の両端に、前記現像
剤を中央の攪拌室と両側の攪拌室との間で搬送する搬送
通路を形成した攪拌槽と、 現像に使用されずに残存した現像剤と前記トナー供給口
から補充されたトナーとを攪拌しつつ、現像剤を中央の
攪拌室のトナー供給口側からトナー供給口側と反対端の
搬送通路、両側の攪拌室、トナー供給口側の搬送通路へ
と循環させる攪拌手段と、を備えたことを特徴とする現
像装置。1. A developing device for non-contact development of an electrostatic latent image using a two-component developer comprising a toner and a carrier, which is arranged horizontally below an image forming body on which an electrostatic latent image is formed,
When viewed from the image forming body side, they rotate in the opposite directions from the outer side to the inner side, respectively, and convey the developer to the surface of the image forming body in a non-contact manner while depositing the developer on the outer surface in a thin layer. It is divided by two developing rolls to fly and two partition plates parallel to the rotation axes of the two developing rolls, and has a toner supply port on one end side in the rotation axis direction to scrape from the two development rolls. Three stirring chambers, namely, a central stirring chamber for collecting the taken developer and two stirring chambers located on both sides of the central stirring chamber for supplying the developing agent to both developing rolls are formed, and a rotation axis direction of the partition plate is formed. A stirring tank having a transport passage for transporting the developer between the central stirring chamber and the stirring chambers on both sides at both ends of the developer, and the remaining developer not used for development and the toner supply port are replenished. While stirring the toner and the toner, Transport path of the toner supply port side and the opposite end from the toner supply port side of the 拌室, both sides of the agitating chamber, a developing apparatus characterized by comprising a stirring means for circulating to the conveyance passage of the toner supply port side.
現像剤の量を0.002 〜0.1 ｇ／cm2としたことを特徴と
する請求項１に記載の現像装置。2. The developing device according to claim 1, wherein the amount of the thin layer developer attached to the two developing rolls is 0.002 to 0.1 g / cm 2 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4063909A JPH05265315A (en) | 1992-03-19 | 1992-03-19 | Developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4063909A JPH05265315A (en) | 1992-03-19 | 1992-03-19 | Developing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05265315A true JPH05265315A (en) | 1993-10-15 |
Family
ID=13242936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4063909A Pending JPH05265315A (en) | 1992-03-19 | 1992-03-19 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05265315A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0780913A1 (en) | 1995-12-20 | 1997-06-25 | Seiko Epson Corporation | Piezoelectric thin-film element and ink-jet recording head using the same |
| JP2006106559A (en) * | 2004-10-08 | 2006-04-20 | Konica Minolta Business Technologies Inc | Development apparatus and image forming apparatus |
| JP2010276879A (en) * | 2009-05-28 | 2010-12-09 | Ricoh Co Ltd | Developing device and image forming apparatus |
| JP2011059417A (en) * | 2009-09-10 | 2011-03-24 | Ricoh Co Ltd | Developing device and image forming apparatus |
-
1992
- 1992-03-19 JP JP4063909A patent/JPH05265315A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0780913A1 (en) | 1995-12-20 | 1997-06-25 | Seiko Epson Corporation | Piezoelectric thin-film element and ink-jet recording head using the same |
| JP2006106559A (en) * | 2004-10-08 | 2006-04-20 | Konica Minolta Business Technologies Inc | Development apparatus and image forming apparatus |
| JP4492283B2 (en) * | 2004-10-08 | 2010-06-30 | コニカミノルタビジネステクノロジーズ株式会社 | Developing device and image forming apparatus |
| JP2010276879A (en) * | 2009-05-28 | 2010-12-09 | Ricoh Co Ltd | Developing device and image forming apparatus |
| JP2011059417A (en) * | 2009-09-10 | 2011-03-24 | Ricoh Co Ltd | Developing device and image forming apparatus |
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