JPH08305119A - Rotary developing device - Google Patents
Rotary developing deviceInfo
- Publication number
- JPH08305119A JPH08305119A JP7137173A JP13717395A JPH08305119A JP H08305119 A JPH08305119 A JP H08305119A JP 7137173 A JP7137173 A JP 7137173A JP 13717395 A JP13717395 A JP 13717395A JP H08305119 A JPH08305119 A JP H08305119A
- Authority
- JP
- Japan
- Prior art keywords
- developing
- developing device
- toner
- rotation
- developer
- 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.)
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- Dry Development In Electrophotography (AREA)
- Color Electrophotography (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、電子写真方式等を利用
した多色画像形成装置に使用する回転現像装置に関する
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary developing device used in a multicolor image forming apparatus utilizing an electrophotographic system or the like.
【0002】[0002]
【従来の技術】多色の複写機あるいはレーザビームプリ
ンタなど、電子写真プロセスを用いた多色画像形成装置
は、従来、図5に示すように構成されている。2. Description of the Related Art A multicolor image forming apparatus using an electrophotographic process, such as a multicolor copying machine or a laser beam printer, has conventionally been constructed as shown in FIG.
【0003】多色画像形成装置は、矢印R1方向に回転
する感光ドラム1を有し、この感光ドラム1が帯電装置
2によって所定の電位に帯電処理される。ついで、露光
装置3、すなわちカラー原稿画像の色分解にもとづく結
像露光光学系、あるいは画像情報の時系列電気デジタル
画素信号に対応して変調されたレーザビームを出力する
レーザスキャナによる走査露光光学系から、光画像情報
を受けることにより、目的のカラー画像の第1の色成分
像、たとえばマゼンタ成分像に対応した静電潜像が形成
される。The multicolor image forming apparatus has a photosensitive drum 1 which rotates in the direction of arrow R1, and the photosensitive drum 1 is charged to a predetermined potential by a charging device 2. Next, the exposure device 3, that is, an image forming exposure optical system based on color separation of a color original image, or a scanning exposure optical system using a laser scanner that outputs a laser beam modulated in accordance with a time series electric digital pixel signal of image information By receiving the optical image information, the electrostatic latent image corresponding to the first color component image of the target color image, for example, the magenta component image is formed.
【0004】ついで、その静電潜像は感光ドラム1の回
転にともない、回転現像装置4の第1現像器であるマゼ
ンタ色現像器41と対向して現像され、マゼンタトナー
像として可視化される。回転現像装置40は、第1、第
2、第3および第4の現像器として、マゼンタ色現像器
41、シアン色現像器42、イエロー色現像器43およ
びブラック色現像器44を有し、これら現像器41〜4
4は、周方向に等間隔で配列されている。感光ドラム1
上に形成されたマゼンタトナー像は、転写ドラム5の表
面に静電的に支持された記録紙6に静電転写され、この
転写で感光ドラム1上に残留したトナーは、クリーニン
グ装置7により清掃される。Then, as the photosensitive drum 1 rotates, the electrostatic latent image is developed so as to face the magenta color developing device 41 which is the first developing device of the rotary developing device 4, and is visualized as a magenta toner image. The rotary developing device 40 has a magenta color developing device 41, a cyan color developing device 42, a yellow color developing device 43 and a black color developing device 44 as the first, second, third and fourth developing devices. Developing devices 41 to 4
4 are arranged at equal intervals in the circumferential direction. Photosensitive drum 1
The magenta toner image formed above is electrostatically transferred to the recording paper 6 that is electrostatically supported on the surface of the transfer drum 5, and the toner remaining on the photosensitive drum 1 by this transfer is cleaned by the cleaning device 7. To be done.
【0005】以下、同様にシアン、イエローおよびブラ
ックについて、潜像形成、現像および転写のプロセスが
順次繰り返されることによって、転写ドラム5上の記録
紙6にマゼンタ、シアン、イエローおよびブラックの4
色のトナー像が重ね合わさて転写され、目的のカラー画
像に対応した合成カラートナー画像が形成される。Similarly, the latent image formation, development, and transfer processes are sequentially repeated for cyan, yellow, and black, so that the recording paper 6 on the transfer drum 5 is magenta, cyan, yellow, and black.
The color toner images are superimposed and transferred, and a composite color toner image corresponding to the target color image is formed.
【0006】4色のトナー像の重畳転写が終了した記録
紙6は、転写ドラム5から分離されて定着器8に搬送さ
れ、そこで所定温度に加熱温調した定着ローラ81と加
圧ローラ82とにより加熱および加圧されて、4色のト
ナー像の混色および記録紙6への固定の定着処理を受
け、フルカラー画像として画像形成装置の機外に最終的
に出力される。The recording paper 6 on which the superposed transfer of the four color toner images has been completed is separated from the transfer drum 5 and conveyed to the fixing device 8, where a fixing roller 81 and a pressure roller 82 are heated and adjusted to a predetermined temperature. Is heated and pressurized by the process, mixed with the toner images of four colors and fixedly fixed on the recording paper 6, and finally output as a full-color image outside the image forming apparatus.
【0007】前記の回転現像装置40の各現像器41〜
44には、二成分現像器あるいは非磁性一成分現像器な
どが用いられる。二成分現像器は、酸化鉄粉等の磁性キ
ャリアと非磁性着色トナーを混合した現像剤を用い、こ
れを収容した現像容器(ホッパー)から現像スリーブ上
に担持して感光ドラム1と対向した現像部に搬送し、現
像部で現像剤の磁気ブラシを形成して、感光ドラム上の
潜像を現像する方式を採る。非磁性一成分現像器は、非
磁性トナーのみからなる現像剤を用い、現像容器から現
像剤を現像スリーブに塗布して現像部に搬送し、潜像を
現像するものである。Each of the developing devices 41 to 41 of the rotary developing device 40.
For 44, a two-component developing device or a non-magnetic one-component developing device is used. The two-component developing device uses a developer in which a magnetic carrier such as iron oxide powder and a non-magnetic colored toner are mixed, and a developer container (hopper) containing the developer carries the developer on a developing sleeve to face the photosensitive drum 1. Then, the magnetic brush of the developer is formed in the developing section, and the latent image on the photosensitive drum is developed. The non-magnetic one-component developing device uses a developer consisting of only non-magnetic toner, applies the developer from a developing container to a developing sleeve, conveys it to a developing section, and develops a latent image.
【0008】回転現像装置40は、矢印R2の向きに回
転駆動されることによって、周方向に配列された現像器
41〜44を回転、移送し、感光ドラム1上に形成され
る静電潜像に対応した色の現像器を、感光ドラム1に対
面した現像位置に搬送して停止する。現像位置に位置し
た現像器は、現像スリーブが感光ドラムとの対向を保っ
たまま回転することにより、感光ドラム上の静電潜像を
現像する。The rotary developing device 40 is driven to rotate in the direction of arrow R2 to rotate and transfer the developing devices 41 to 44 arranged in the circumferential direction to form an electrostatic latent image on the photosensitive drum 1. The developing device of the color corresponding to is conveyed to the developing position facing the photosensitive drum 1 and stopped. The developing unit located at the developing position develops the electrostatic latent image on the photosensitive drum by rotating the developing sleeve while keeping the developing sleeve facing the photosensitive drum.
【0009】[0009]
【発明が解決しようとする課題】ところで、上記従来の
回転現像装置40において、現像器の周方向回転にとも
ない、現像器の重力方向に対する姿勢が変化し回転する
と、つまり、現像位置の正姿勢→上向き→転倒→下向き
→正姿勢のように、現像器の姿勢が回転すると、その現
像容器内で現像剤またはトナーが過剰に動き、帯電不十
分なトナーが現像スリーブに供給される。このため、現
像画像の濃度の不均一やかぶり、あるいは現像装置4内
へのトナー飛散を招くことがあった。By the way, in the above-described conventional rotary developing device 40, when the developing device rotates in the circumferential direction of the developing device, the attitude of the developing device changes with respect to the gravity direction. When the attitude of the developing device is rotated in the order of upward → overturn → downward → normal attitude, the developer or toner excessively moves in the developing container, and the insufficiently charged toner is supplied to the developing sleeve. For this reason, the density of the developed image may be non-uniform, fogging, or toner may be scattered into the developing device 4.
【0010】そこで、これを防止するために、周方向に
ゴンドラを配列した観覧車のように、回転によっても各
現像器41〜44の姿勢が重力方向に対し変わらないよ
うに、回転現像装置40を構成することがあるが、その
場合には、各現像器を重力方向に一定に支持しておく回
転支軸構造、および、現像位置で感光ドラムに対し現像
器を位置決めし、また解除する着脱機構などが必要にな
るため、装置構成が複雑化、大型化するという不都合が
あった。Therefore, in order to prevent this, like the ferris wheel in which the gondola is arranged in the circumferential direction, the rotation developing device 40 does not change the posture of each of the developing devices 41 to 44 with respect to the gravity direction even when rotated. In such a case, in that case, a rotation support shaft structure for supporting each developing device in the direction of gravity in a constant manner, and attaching / detaching to position and release the developing device with respect to the photosensitive drum at the developing position. Since a mechanism or the like is required, there is a disadvantage that the device configuration becomes complicated and the size becomes large.
【0011】本発明の目的は、周方向に配列した複数の
現像器の周方向回転動作にともない、各現像器の姿勢が
回転してその現像容器内の現像剤が過剰に動いても、現
像剤担持体上に帯電が十分なトナーを担持して、像担持
体と対向した現像部に搬送し、現像に供することができ
る回転現像装置を提供することである。SUMMARY OF THE INVENTION It is an object of the present invention to develop a developer even if the developer in the developer container moves excessively due to the rotation of the attitude of each of the developers in accordance with the circumferential rotation of a plurality of the developers arranged in the circumferential direction. It is an object of the present invention to provide a rotary developing device capable of carrying a sufficiently charged toner on an agent carrier, carrying the toner to a developing unit facing the image carrier, and using the developer for development.
【0012】[0012]
【課題を解決するための手段】上記目的は、本発明にか
かる回転現像装置にて達成される。要約すれば、本発明
は、周方向に配列された複数の現像器を担持して周方向
に回転し、現像器が像担持体と対面した現像位置で周方
向回転を停止し、現像位置に位置した現像器により、像
担持体上に形成された静電潜像を現像させる回転現像装
置において、前記現像位置以外の位置において現像器の
現像剤担持体を回転する手段を備えたことを特徴とする
回転現像装置である。The above object can be achieved by the rotary developing device according to the present invention. In summary, according to the present invention, a plurality of developing devices arranged in the circumferential direction are carried and rotated in the circumferential direction, and the developing device stops the circumferential rotation at the developing position facing the image carrier and moves to the developing position. A rotary developing device for developing an electrostatic latent image formed on an image bearing member by a positioned developing device, comprising means for rotating a developer bearing member of the developing device at a position other than the developing position. Is a rotary developing device.
【0013】本発明によれば、前記回転手段は、現像器
回転の周方向軌道の外側寄りの一所に設置した、現像器
の現像剤担持体に設けられたギアと前記外側寄りの位置
でかみ合って駆動する駆動ギアとされ、あるいは、現像
器回転の回転中心に同軸に設置した、複数の現像器の現
像剤担持体に設けられたギアの全てと、現像器回転の周
方向軌道の内側寄りの位置でかみ合って駆動する駆動ギ
アとされる。また前記現像器が、磁性キャリアと非磁性
トナーとを混合した二成分現像剤を使用する二成分現像
器、あるいは非磁性トナーのみからなる非磁性一成分現
像剤を使用する一成分現像器とされる。According to the present invention, the rotating means is provided at a position on the outer side of the circumferential orbit of the rotation of the developing device, and a gear provided on the developer carrier of the developing device and a position on the outer side. Inside of the circumferential orbit of the rotation of the developing device and all the gears provided on the developer carrying members of a plurality of developing devices, which are used as driving gears that are engaged with each other or are installed coaxially with the rotation center of the developing device rotation. It is a drive gear that is engaged and driven at a position closer to it. Further, the developing device is a two-component developing device using a two-component developing agent in which a magnetic carrier and a non-magnetic toner are mixed, or a one-component developing device using a non-magnetic one-component developing agent containing only non-magnetic toner. It
【0014】[0014]
【実施例】以下、本発明の実施例を図面にそって説明す
る。図1に、本発明の一実施例にかかる回転現像装置
を、感光ドラムなどとともに模式的に示す。図1では、
回転現像装置60を隣接設置した感光ドラム1の周囲
に、帯電装置2および露光装置3が図示されているが、
これらは、図5に示した画像形成装置のときと同一なの
で、その説明は省略する。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows a rotary developing device according to an embodiment of the present invention together with a photosensitive drum and the like. In Figure 1,
Although the charging device 2 and the exposure device 3 are shown around the photosensitive drum 1 in which the rotary developing device 60 is installed adjacently,
Since these are the same as those in the image forming apparatus shown in FIG. 5, description thereof will be omitted.
【0015】回転現像装置60は、周方向にマゼンタ色
現像器61、シアン色現像器62、イエロー色現像器6
3およびブラック色現像器64を配列してなっており、
感光ドラム1と対面した現像位置に定置された現像器を
切換えるために、矢印R2の向き回転することによっ
て、現像器61〜64を同方向の周方向に回転させる。The rotary developing device 60 includes a magenta color developing device 61, a cyan color developing device 62, and a yellow color developing device 6 in the circumferential direction.
3 and the black color developing device 64 are arranged,
In order to switch the developing device fixed at the developing position facing the photosensitive drum 1, the developing devices 61 to 64 are rotated in the same circumferential direction by rotating in the direction of arrow R2.
【0016】本発明によれば、これら現像器61〜64
は、回転現像装置60に固定設置されており、現像位置
においてそれぞれの現像器61〜64の現像スリーブ1
2が感光ドラム1と対向するように、回転現像装置60
の中心から見て現像スリーブ12を外側にした姿勢で、
現像器61〜64が回転現像装置60に配置されてい
る。従って、現像器は重力方向に対する姿勢が変化して
回転し、現像位置から矢印R2方向に1/4回転した位
置では、現像器は上向き、1/2回転した位置では転
倒、3/4回転した位置では下向きの回転姿勢をとる。According to the present invention, these developing devices 61-64
Is fixedly installed on the rotary developing device 60, and the developing sleeve 1 of each of the developing devices 61 to 64 at the developing position.
2 so that the photosensitive drum 1 and the photosensitive drum 1 face each other.
With the developing sleeve 12 facing outward from the center of
The developing devices 61 to 64 are arranged in the rotary developing device 60. Therefore, the developing device changes its posture with respect to the direction of gravity and rotates, and the developing device is turned upward at a position rotated 1/4 in the direction of arrow R2 from the developing position, and is rotated 3/4 at a position rotated 1/2. In the position, it takes a downward rotation posture.
【0017】このように、各現像器61〜64が回転現
像装置60の中心に対する配置姿勢を保ったまま移動す
る構成では、従来の観覧車方式の回転現像装置と違い、
各現像器を重力方向に一定に支持しておく回転支軸構
造、および、現像位置で感光ドラムに対し現像器を位置
決めし、また解除する着脱機構などが不要になるので、
装置構成が簡単になり、小型化を図ることができる。In this way, in the structure in which the developing devices 61 to 64 move while maintaining the arrangement posture with respect to the center of the rotary developing device 60, unlike the conventional ferris wheel type rotary developing device,
Since there is no need for a rotating support shaft structure that holds each developing device uniformly in the direction of gravity, and an attachment / detachment mechanism that positions and releases the developing device with respect to the photosensitive drum at the developing position,
The device configuration is simplified, and the size can be reduced.
【0018】本実施例では、回転現像装置60の各現像
器61〜64として、図2に示すような二成分現像器が
用いられており、その現像容器17内には、非磁性金属
の現像スリーブ12側に酸化鉄粉などの磁性キャリア1
3が、その奥側に非磁性トナー14が収容されている。
磁性キャリア13と非磁性トナー14とは、混合するこ
とによって二成分現像剤として使用され、キャリア13
の表面に静電的にトナー14が付着した形態をとる。現
像容器17の感光ドラムとの対向位置に位置されること
になる開口部には、上記の現像スリーブ12が配設さ
れ、現像スリーブ12内にはマグネットローラ11が同
心に配置され、現像スリーブ12の上方には、これと所
定の間隙を開けてドクターブレード15が設置されてい
る。また現像容器17内には撹拌スクリュー16が設置
されている。In this embodiment, a two-component developing device as shown in FIG. 2 is used as each of the developing devices 61 to 64 of the rotary developing device 60, and the developing container 17 has a non-magnetic metal developing device. Magnetic carrier 1 such as iron oxide powder on the sleeve 12 side
3, the non-magnetic toner 14 is stored on the back side thereof.
The magnetic carrier 13 and the non-magnetic toner 14 are mixed and used as a two-component developer.
The toner 14 is electrostatically attached to the surface of the. The developing sleeve 12 is arranged in an opening portion of the developing container 17 which is located at a position facing the photosensitive drum, and the magnet roller 11 is concentrically arranged in the developing sleeve 12. A doctor blade 15 is installed above the above with a predetermined gap therebetween. A stirring screw 16 is installed in the developing container 17.
【0019】現像容器17内のトナー14が撹拌スクリ
ュー16により現像スリーブ12方向に移動され、現像
スリーブ12側にある磁性キャリア13と混合されて、
現像剤が構成される。その現像剤が現像スリーブ12の
表面に供給され、マグネットローラ11による磁力で現
像スリーブ12の表面に磁性キャリア13が付着し、そ
のキャリア13の表面にトナー14が静電吸着した状態
で、現像剤が現像スリーブ12上に担持される。The toner 14 in the developing container 17 is moved toward the developing sleeve 12 by the stirring screw 16 and mixed with the magnetic carrier 13 on the developing sleeve 12 side,
The developer is composed. The developer is supplied to the surface of the developing sleeve 12, the magnetic carrier 13 is attached to the surface of the developing sleeve 12 by the magnetic force of the magnet roller 11, and the toner 14 is electrostatically adsorbed on the surface of the carrier 13, so that the developer is Are carried on the developing sleeve 12.
【0020】現像スリーブ12上に担持された現像剤
は、現像スリーブ12の回転により感光ドラムと対向し
た現像部へ向けて搬送され、その搬送途上でドクターブ
レード15およびマグネットローラ11により磁気的に
規制されて、現像スリーブ12上に薄層の現像剤層とし
て塗布される。薄層に塗布された現像剤は、現像部にお
いてマグネットローラ11の磁力により磁気ブラシを形
成し、感光ドラム上の潜像を現像する。The developer carried on the developing sleeve 12 is conveyed toward the developing portion facing the photosensitive drum by the rotation of the developing sleeve 12, and the doctor blade 15 and the magnet roller 11 magnetically regulate the toner during the conveyance. Then, it is applied as a thin developer layer on the developing sleeve 12. The developer applied in a thin layer forms a magnetic brush by the magnetic force of the magnet roller 11 in the developing section to develop the latent image on the photosensitive drum.
【0021】このような二成分現像器では、現像容器1
7内の磁性キャリア13の量が、マグネットローラ11
による磁界で現像スリーブ12上に保持できる量よりも
多いのが一般的である。本構成の如く、回転現像装置6
0において各現像器を固定設置した場合、現像器の周方
向回転にともない、現像器の姿勢が変化して回転し、こ
れにより現像容器17内の現像剤が掻き回されて、帯電
不十分なトナーが現像スリーブ12に過剰に供給され
る。すなわち、現像位置から1/4〜2/4回転した現
像器が上向き〜転倒した回転姿勢をとっている状態のと
き、現像容器17内でキャリア13が現像スリーブ12
の近くから散逸し、その後、3/4回転した下向きの回
転姿勢になるときに、キャリア13が現像スリーブ12
の近くに戻ってくる。この現像スリーブ12の近くに戻
ってくるときに、キャリア13がトナー14を過剰に取
り込んでくるので、トナーとキャリアの混合比(T/C
比)が高くなるとともに、キャリア13との摩擦帯電が
不十分なトナーを多量に含むことになる。In such a two-component developing device, the developing container 1
The amount of magnetic carrier 13 in 7 is equal to that of magnet roller 11
Is generally larger than the amount that can be held on the developing sleeve 12 by the magnetic field. As in this configuration, the rotary developing device 6
When each developing device is fixedly installed at 0, the posture of the developing device changes and rotates as the developing device rotates in the circumferential direction, whereby the developer in the developing container 17 is scratched and insufficiently charged. Toner is excessively supplied to the developing sleeve 12. That is, when the developing device rotated 1/4 to 2/4 from the developing position is in a state in which the developing device is in an upward to inverted rotational posture, the carrier 13 is held in the developing container 17 by the carrier 13 in the developing sleeve 12.
When the carrier 13 is dissipated from the vicinity of the developing sleeve and then in the downward rotation posture of 3/4 rotation, the carrier 13
Come back near. When returning to the vicinity of the developing sleeve 12, the carrier 13 takes in the toner 14 excessively, so that the mixing ratio of the toner and the carrier (T / C
Ratio becomes high, and a large amount of toner whose frictional electrification with the carrier 13 is insufficient is included.
【0022】従って、現像位置に戻った正姿勢の現像器
(現像位置では回転のない正姿勢に復帰している)によ
り現像を行なうと、その帯電不十分なトナーを含んだ現
像剤が現像部に搬送されて現像に供されるので、現像画
像の濃度の不均一やかぶりが生じる。また現像スリーブ
12表面および感光ドラム1表面への付着力が弱いの
で、現像バイアスによる静電的振動および感光ドラム回
転による風圧を受けたときに、装置内へのトナー飛散を
生じやすい。Therefore, when development is carried out by the developing device in the normal position returned to the developing position (returning to the normal position with no rotation at the developing position), the developer containing the insufficiently charged toner is developed. Since the image is conveyed to the developing device for development, the density of the developed image becomes uneven and fogging occurs. Further, since the adhesion to the surface of the developing sleeve 12 and the surface of the photosensitive drum 1 is weak, the toner is likely to be scattered into the apparatus when receiving electrostatic vibration due to the developing bias and wind pressure due to rotation of the photosensitive drum.
【0023】そこで、本発明では、回転現像装置60の
感光ドラム1に対面した現像位置以外の位置に、現像器
の現像スリーブ12を回転する手段を設置して、現像位
置以外でも現像器の現像スリーブ12を回転駆動状態を
保つようにした。Therefore, in the present invention, a means for rotating the developing sleeve 12 of the developing device is installed at a position other than the developing position of the rotary developing device 60 facing the photosensitive drum 1 so that the developing device develops at a position other than the developing position. The sleeve 12 is kept in a rotationally driven state.
【0024】本実施例によれば、現像スリーブ回転手段
は、図1に示したように、現像器回転の周方向軌道の外
側寄りの、たとえば現像位置から3/4回転した位置に
設置した小径の駆動ギア10からなる。その位置には図
では、つぎに感光ドラム1と対面するブラック色現像器
64が位置されている。この駆動ギア10が、ブラック
色現像器64の現像スリーブ12に設けられた図示しな
いギアとかみ合って矢印R3方向に回転することによ
り、現像スリーブ12を現像時と同方向のR4方向に回
転駆動する。According to the present embodiment, the developing sleeve rotating means is, as shown in FIG. 1, provided with a small diameter outside the circumferential orbit of rotation of the developing device, for example, at a position rotated 3/4 rotation from the developing position. Drive gear 10. In the figure, the black developing device 64 facing the photosensitive drum 1 is next positioned at that position. The drive gear 10 engages with a gear (not shown) provided on the developing sleeve 12 of the black color developing device 64 and rotates in the arrow R3 direction, thereby rotating the developing sleeve 12 in the R4 direction which is the same direction as during development. .
【0025】従って、現像スリーブ12の近くに戻って
きた、トナーが過剰でかつ帯電不十分なトナーを多量に
含む現像剤が、現像スリーブ12の回転により現像容器
17内に回収されて、現像剤から過剰なトナーが吐き出
されるとともに、残存したトナーが十分な時間で撹拌さ
れて摩擦帯電される。このため、現像器が現像位置に位
置したときに、トナー14の帯電が十分でT/C比が適
正な現像剤を現像スリーブ12上に担持して現像部に搬
送し、感光ドラム1の現像に供することができる。Therefore, the developer containing a large amount of excessive toner and insufficiently charged toner returning to the vicinity of the developing sleeve 12 is collected in the developing container 17 by the rotation of the developing sleeve 12, and the developer is Excess toner is discharged from the toner, and the remaining toner is stirred and friction-charged for a sufficient time. For this reason, when the developing device is located at the developing position, a developer having sufficient toner 14 and a proper T / C ratio is carried on the developing sleeve 12 and conveyed to the developing section, and the developing of the photosensitive drum 1 is performed. Can be used for
【0026】その結果、現像画像の濃度の不均一やかぶ
りを生じることがなく、高品質な画像を得ることができ
る。また、トナー14の現像スリーブ12表面および感
光ドラム1表面への付着力が強いので、現像バイアスに
よる静電的振動および感光ドラム回転による風圧を受け
ても、装置内へのトナー飛散を生じることがない。As a result, it is possible to obtain a high-quality image without causing uneven density or fogging of the developed image. Further, since the toner 14 has a strong adhesive force on the surface of the developing sleeve 12 and the surface of the photosensitive drum 1, the toner may be scattered into the apparatus even if it receives electrostatic vibration due to the developing bias and wind pressure due to rotation of the photosensitive drum. Absent.
【0027】本発明の他の実施例にかかる回転現像装置
を図3に示す。本実施例の回転現像装置80は、非磁性
一成分現像器からなるマゼンタ色現像器81、シアン色
現像器82、イエロー色現像器83およびブラック色現
像器84を、周方向に配列してなっており、先の実施例
のとき同様、現像器81〜84は、回転現像装置80の
中心から見て現像スリーブ19を外側にした姿勢で固定
設置されている。A rotary developing device according to another embodiment of the present invention is shown in FIG. The rotary developing device 80 of this embodiment comprises a magenta color developing device 81, a cyan color developing device 82, a yellow developing device 83 and a black developing device 84, which are non-magnetic one-component developing devices, arranged in the circumferential direction. As in the case of the previous embodiment, the developing devices 81 to 84 are fixedly installed with the developing sleeve 19 facing outward from the center of the rotary developing device 80.
【0028】これら非磁性一成分現像器81〜84は、
図4に示すような現像器に構成されている。本現像器
は、非磁性一成分現像剤である非磁性トナー18を収容
した現像器22を有し、現像容器22の感光ドラムとの
対向位置に位置されることになる開口部に、半導電性の
弾性部材からなる現像ローラ19が設置され、現像ロー
ラ19の開口部と反対側の面には、導電性ゴムスポンジ
等からなる弾性ローラ21が圧接されている。現像容器
22内の非磁性トナー18は、弾性ローラ21の回転に
よりその上に担持されて現像ローラ19方向に供給さ
れ、弾性ローラ21の現像ローラ19との圧接部におい
て摺擦される。この弾性ローラ21と現像ローラ19と
の圧接部での摺擦により、トナー18に摩擦帯電電荷が
付与されるとともに、トナー18が現像ローラ19上に
塗布されて担持される。These non-magnetic one-component developing devices 81-84 are
The developing device is configured as shown in FIG. The present developing device has a developing device 22 containing a non-magnetic toner 18 which is a non-magnetic one-component developer, and a semi-conductive member is provided in an opening portion of the developing container 22 facing the photosensitive drum. A developing roller 19 made of a flexible elastic member is installed, and an elastic roller 21 made of a conductive rubber sponge or the like is pressed against the surface of the developing roller 19 opposite to the opening. The non-magnetic toner 18 in the developing container 22 is carried on the elastic roller 21 by the rotation of the elastic roller 21 and supplied toward the developing roller 19, and is rubbed against the developing roller 19 by the elastic roller 21. By the frictional contact between the elastic roller 21 and the developing roller 19, the toner 18 is triboelectrically charged, and the toner 18 is applied and carried on the developing roller 19.
【0029】現像ローラ19上に担持されたトナー18
は、現像ローラ19の回転により搬送され、その搬送途
上、現像ローラ19の略頂部に当接した弾性ブレード2
0により摺擦されて、さらに摩擦帯電電荷が付与される
ともに、層厚規制されて現像ローラ19上に均一なトナ
ー層に形成される。トナー層に形成されたトナー18
は、現像ローラ19の回転にともない感光ドラム1と対
面した現像部に搬送され、感光ドラム1上に形成された
潜像の現像に供される。Toner 18 carried on the developing roller 19
Is conveyed by the rotation of the developing roller 19, and the elastic blade 2 that abuts on substantially the top of the developing roller 19 during the conveyance.
The toner is rubbed by 0 to impart a triboelectric charge, and the layer thickness is regulated to form a uniform toner layer on the developing roller 19. Toner 18 formed on the toner layer
Is conveyed to the developing section facing the photosensitive drum 1 as the developing roller 19 rotates, and is used for developing the latent image formed on the photosensitive drum 1.
【0030】このように、非磁性一成分現像器では、非
磁性トナー18の帯電機構が、弾性ローラ21と現像ロ
ーラ19の摺擦によるものと、弾性ブレード20と現像
ローラ19の摺擦によるものとからなる。このため、回
転現像装置80の回転にともない現像器の姿勢が変化、
回転し、その姿勢が回転した状態のときに、トナー18
が弾性ローラ21による圧接を介さずに直接に現像ロー
ラ19へ供給されると、その摺擦による帯電を欠くた
め、弾性ブレード20による摺擦があってもトナーの帯
電が不十分となる。この帯電不十分なトナーが、現像ロ
ーラ19上に担持されて現像部に搬送されることになる
ので、トナーの飛散やかぶりを生じる。As described above, in the non-magnetic one-component developing device, the charging mechanism for the non-magnetic toner 18 is based on the sliding friction between the elastic roller 21 and the developing roller 19 and the sliding mechanism between the elastic blade 20 and the developing roller 19. Consists of. Therefore, the attitude of the developing device changes as the rotary developing device 80 rotates,
When the toner is rotated and its posture is rotated, the toner 18
When the toner is directly supplied to the developing roller 19 without pressure contact by the elastic roller 21, the charging due to the rubbing is lost, so that the toner is insufficiently charged even if the elastic blade 20 rubs. This insufficiently charged toner is carried on the developing roller 19 and conveyed to the developing section, so that toner scattering and fogging occur.
【0031】そこで、本実施例では、回転現像装置80
の現像器81〜84の周方向回転の回転中心と同軸に大
径の駆動ギア23を設置して、この駆動ギア23を現像
器回転の周方向軌道の内側寄りの位置で、現像器81〜
84の現像ローラ19に設けられた図示しないギアとか
み合わせて矢印R5方向に回転するようにした。これに
より、現像位置に位置した現像器81の現像ローラ19
を矢印R6方向に回転駆動して、現像器81に現像動作
をさせるとともに、その他の位置にある現像器82〜8
4の現像ローラ19を全て、現像動作時の回転と同方向
のR7方向に回転駆動する。Therefore, in this embodiment, the rotary developing device 80 is used.
A large-diameter drive gear 23 is installed coaxially with the center of rotation of the developing devices 81 to 84 in the circumferential direction, and the driving gear 23 is located at a position closer to the inner side of the circumferential orbit of rotation of the developing devices 81 to 84.
The developing roller 19 of 84 is engaged with a gear (not shown) to rotate in the direction of arrow R5. As a result, the developing roller 19 of the developing device 81 located at the developing position
Is rotated in the direction of arrow R6 to cause the developing device 81 to perform a developing operation, and the developing devices 82 to 8 located at other positions.
All the developing rollers 19 of No. 4 are rotationally driven in the R7 direction which is the same direction as the rotation during the developing operation.
【0032】従って、現像器の姿勢が回転した状態のと
きに、弾性ローラ21の圧接を介さずに現像ローラ19
に直接トナー18が供給されても、そのトナー18を現
像ローラ19上に担持して現像器が現像位置に至るまで
に繰り返し回転し、弾性ブレード20の圧接によりトナ
ー18を十分な時間で帯電して、トナーの帯電を十分に
することができる。このため、現像器が現像位置に位置
したときに、現像ローラ19により帯電が十分なトナー
18を現像部に搬送して、感光ドラム1の現像に供する
ことができ、濃度が十分でカブリのない高品質な現像を
得ることができる。また装置内へのトナーの飛散を生じ
ることもない。Therefore, when the posture of the developing device is rotated, the developing roller 19 is not pressed by the elastic roller 21.
Even if the toner 18 is directly supplied to the developing roller 19, the toner 18 is carried on the developing roller 19 and the developing device is repeatedly rotated until it reaches the developing position, and the elastic blade 20 is pressed to charge the toner 18 in a sufficient time. As a result, the toner can be sufficiently charged. Therefore, when the developing device is located at the developing position, the developing roller 19 can convey the sufficiently charged toner 18 to the developing portion to be used for developing the photosensitive drum 1, and the density is sufficient and there is no fog. High quality development can be obtained. Further, the toner is not scattered into the apparatus.
【0033】[0033]
【発明の効果】以上説明したように、本発明の回転現像
装置は、複数の二成分現像器または非磁性一成分現像器
を周方向に配列し、固定設置してなっている。本発明で
は、その現像器が像担持体と対向する現像位置以外の位
置に現像器の現像剤担持体を回転する手段を設け、現像
器が現像位置に至るまでに、現像容器内の二成分現像剤
または一成分現像剤の非磁性トナーを撹拌するようにし
た。従って、現像器の周方向回転にともない各現像器の
姿勢が回転して、その現像容器内の二成分現像剤または
一成分現像剤の非磁性トナーが過剰に動き、現像剤担持
体に帯電が不十分なトナーが供給されても、現像器が現
像装置に至るまでにトナーの帯電を安定することができ
る。その結果、現像画像の濃度の不均一やかぶりを生じ
ることがなく、高品質な画像を得ることができ、また装
置内へのトナー飛散を生じることもない。As described above, in the rotary developing device of the present invention, a plurality of two-component developing devices or non-magnetic one-component developing devices are circumferentially arranged and fixedly installed. In the present invention, means for rotating the developer carrier of the developing device is provided at a position other than the developing position where the developing device faces the image carrier, and the two components in the developing container are set by the time the developing device reaches the developing position. The non-magnetic toner of the developer or the one-component developer was agitated. Therefore, the posture of each developing device rotates as the developing device rotates in the circumferential direction, and the non-magnetic toner of the two-component developer or the one-component developer in the developing container moves excessively, and the developer carrier is charged. Even if insufficient toner is supplied, the charging of the toner can be stabilized before the developing device reaches the developing device. As a result, it is possible to obtain a high-quality image without causing non-uniformity in the density of the developed image or fogging, and to prevent toner scattering into the apparatus.
【図1】本発明の一実施例にかかる回転現像装置を模式
的に示す断面図である。FIG. 1 is a sectional view schematically showing a rotary developing device according to an embodiment of the present invention.
【図2】図1の回転現像装置に設置された二成分現像器
を示す断面図である。FIG. 2 is a sectional view showing a two-component developing device installed in the rotary developing device of FIG.
【図3】本発明の他の実施例にかかる回転現像装置を模
式的に示す断面図である。FIG. 3 is a sectional view schematically showing a rotary developing device according to another embodiment of the present invention.
【図4】図3の回転現像装置に設置された非磁性一成分
現像器を示す断面図である。4 is a cross-sectional view showing a non-magnetic one-component developing device installed in the rotary developing device of FIG.
【図5】従来の回転現像装置を設置した多色画像形成装
置を示す概略構成図である。FIG. 5 is a schematic configuration diagram showing a multicolor image forming apparatus in which a conventional rotary developing device is installed.
1 感光ドラム 10、23 駆動ギア 12 現像スリーブ 13 磁性キャリア 14、18 非磁性トナー 15 ドクターブレード 19 現像ローラ 20 弾性ブレード 21 弾性ローラ 60、80 回転現像装置 61〜64 二成分現像器 81〜84 非磁性一成分現像器 1 Photosensitive Drum 10, 23 Drive Gear 12 Developing Sleeve 13 Magnetic Carrier 14, 18 Non-Magnetic Toner 15 Doctor Blade 19 Developing Roller 20 Elastic Blade 21 Elastic Roller 60, 80 Rotating Developing Device 61-64 Two-Component Developing Device 81-84 Non-Magnetic One component developer
Claims (5)
して周方向に回転し、現像器が像担持体と対面した現像
位置で周方向回転を停止し、現像位置に位置した現像器
により、像担持体上に形成された静電潜像を現像させる
回転現像装置において、前記現像位置以外の位置におい
て現像器の現像剤担持体を回転する手段を備えたことを
特徴とする回転現像装置。1. A developing device which carries a plurality of developing devices arranged in the circumferential direction and rotates in the circumferential direction, stops the circumferential rotation at a developing position where the developing device faces the image carrier, and develops the developing device in the developing position. In a rotary developing device for developing an electrostatic latent image formed on an image carrier by a developing device, there is provided a means for rotating the developer carrying member of the developing device at a position other than the developing position. Development device.
道の外側寄りの一所に設置した、現像器の現像剤担持体
に設けられたギアと前記外側寄りの位置でかみ合って駆
動する駆動ギアである請求項1の回転現像装置。2. The rotating means is driven by engaging with a gear provided on a developer carrying member of the developing device, which is installed at a position on the outer side of a circumferential orbit of rotation of the developing device, at a position on the outer side. The rotary developing device according to claim 1, which is a drive gear.
に同軸に設置した、複数の現像器の現像剤担持体に設け
られたギアの全てと、現像器回転の周方向軌道の内側寄
りの位置でかみ合って駆動する駆動ギアである請求項1
の回転現像装置。3. The rotating means comprises all the gears provided on the developer carrying members of a plurality of developing devices, which are installed coaxially with the rotation center of the developing device rotation, and inside the circumferential orbit of the developing device rotation. 2. A drive gear that is engaged and driven at the position
Rotation developing device.
ナーとを混合した二成分現像剤を使用する二成分現像器
である請求項1、2または3の回転現像装置。4. The rotary developing device according to claim 1, wherein the developing device is a two-component developing device that uses a two-component developing agent in which a magnetic carrier and a non-magnetic toner are mixed.
る非磁性一成分現像剤を使用する一成分現像器である請
求項1、2または3の回転現像装置。5. The rotary developing device according to claim 1, wherein the developing device is a one-component developing device using a non-magnetic one-component developer consisting of only non-magnetic toner.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7137173A JPH08305119A (en) | 1995-05-11 | 1995-05-11 | Rotary developing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7137173A JPH08305119A (en) | 1995-05-11 | 1995-05-11 | Rotary developing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH08305119A true JPH08305119A (en) | 1996-11-22 |
Family
ID=15192527
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7137173A Pending JPH08305119A (en) | 1995-05-11 | 1995-05-11 | Rotary developing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH08305119A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007148122A (en) * | 2005-11-29 | 2007-06-14 | Kyocera Mita Corp | Image forming apparatus |
-
1995
- 1995-05-11 JP JP7137173A patent/JPH08305119A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007148122A (en) * | 2005-11-29 | 2007-06-14 | Kyocera Mita Corp | Image forming apparatus |
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