JPH0256580A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPH0256580A JPH0256580A JP20740588A JP20740588A JPH0256580A JP H0256580 A JPH0256580 A JP H0256580A JP 20740588 A JP20740588 A JP 20740588A JP 20740588 A JP20740588 A JP 20740588A JP H0256580 A JPH0256580 A JP H0256580A
- Authority
- JP
- Japan
- Prior art keywords
- developing sleeve
- developing
- developer
- opposite
- magnetic
- 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
- 239000000696 magnetic material Substances 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims 1
- 238000013019 agitation Methods 0.000 abstract 1
- 108091008695 photoreceptors Proteins 0.000 description 14
- 230000000694 effects Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000004061 bleaching Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は、磁性現像剤により静電潜像を可視像化する方
式の電子写真装置における現像装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a developing device in an electrophotographic apparatus that uses a magnetic developer to visualize an electrostatic latent image.
（従来の技術）
一般に電子写真装置では、感光体ドラムの外周の１部に
粉末現像剤を収容した現像装置を設置し、感光体ドラム
上に形成された静電潜像に現像剤を付着させることによ
り可視像化している。現像剤には、磁性現像剤と非磁性
現像剤とがあるが、このうち磁性現像剤を用いる現像装
置においては、回転可能な円筒状の非磁性板からなる現
像スリーブ上に、この現像スリーブ内部に設置された磁
極により、現像剤を現像スリーブ中に着磁させ、磁気ブ
ラシを形成し、感光体上の静電潜像を可視像化している
。このような現像装置では、現像スリーブの回転により
、現像スリーブ上に着磁された現像剤は、この現像スリ
ーブの回転方向に移動し、感光体に対向する位置まで搬
送された後、感光体上に移行される。(Prior Art) Generally, in an electrophotographic apparatus, a developing device containing a powder developer is installed in a part of the outer periphery of a photoreceptor drum, and the developer is attached to an electrostatic latent image formed on the photoreceptor drum. This makes it visible. There are two types of developer: magnetic developer and non-magnetic developer. In a developing device that uses magnetic developer, the inside of this developing sleeve is placed on a developing sleeve made of a rotatable cylindrical non-magnetic plate. The developer is magnetized in the developing sleeve by the magnetic pole installed in the developing sleeve, forming a magnetic brush, and the electrostatic latent image on the photoreceptor is visualized. In such a developing device, as the developing sleeve rotates, the developer magnetized on the developing sleeve moves in the rotational direction of the developing sleeve, is transported to a position facing the photoreceptor, and then is deposited on the photoreceptor. will be moved to
ところがこのような現像装置では、現像スリーブの回転
方向に現像剤の層が形成され、均一な現像剤の層ができ
ない。このため画像形成した際に、画像に“ハキ目”と
よばれる筋ができる、画像濃度が均一にならない等の不
具合が生じた。However, in such a developing device, a layer of developer is formed in the rotational direction of the developing sleeve, and a uniform layer of developer cannot be formed. For this reason, when an image is formed, problems such as streaks called "bleaching" occur in the image and the image density is not uniform occur.
（発明が解決しようとする課題）
以上詳述したように、磁性現像剤を用いた現像装置にお
いては、現像スリーブの回転方向に現像剤の層ができる
ため、画像に ハキ目”とよばれる筋ができたり、画像
濃度が均一にならないという不具合が生じた。(Problems to be Solved by the Invention) As detailed above, in a developing device using a magnetic developer, a layer of developer is formed in the rotational direction of the developing sleeve, resulting in streaks called "flash marks" on the image. Problems occurred in that the image density was not uniform.
本発明では、現像スリーブ内の感光体と対向する位置に
設けられた現像磁極を回転駆動させることにより、現像
スリーブ上にできた現像剤の層を乱して感光体と対向す
る位置に均一な現像剤の層を形成し、均一な濃度の画像
を得ることを目的とした。In the present invention, by rotating the developing magnetic pole provided in the developing sleeve at a position facing the photoreceptor, the layer of developer formed on the developing sleeve is disturbed and the developer layer is uniformly distributed at the position facing the photoreceptor. The purpose was to form a layer of developer and obtain an image with uniform density.
（課題を解決するための手段）
本発明では、現像スリーブ内の感光体ドラムと対向する
位置に、回転可能な現像磁極を設けることにより、現像
スリーブの回転方向にできた現像剤の層を乱し、均一な
現像層を得、以て画像濃度が均一な良好な画像を得るこ
とを目的とした。(Means for Solving the Problems) In the present invention, a rotatable developing magnetic pole is provided at a position facing the photosensitive drum in the developing sleeve, thereby disturbing the layer of developer formed in the rotational direction of the developing sleeve. The purpose of this invention was to obtain a uniform developing layer, thereby obtaining a good image with uniform image density.
（作用）
現像スリーブ内の静電潜像支持体と対向する位置に設け
られた現像磁極の回転により、現像スリーブ上の回転方
向に出来た現像剤の層が乱される。これにより、現像ス
リーブ上の静電潜像支持体と対向する位置に均一な現像
剤の層が形成される。このため、静電潜像への現像剤の
移行が均一に行なわれ、″ハキ目″のない均一な画像濃
度の良好な画像が得られる。(Function) The rotation of the developing magnetic pole provided in the developing sleeve at a position facing the electrostatic latent image supporter disturbs the layer of developer formed on the developing sleeve in the direction of rotation. As a result, a uniform layer of developer is formed on the developing sleeve at a position facing the electrostatic latent image support. For this reason, the developer is uniformly transferred to the electrostatic latent image, and a good image with uniform image density and no "cross-cuts" can be obtained.
（実施例）
以下図面を参照しながら、本発明の１実施例を説明する
。(Example) An example of the present invention will be described below with reference to the drawings.
まず第１図を参照しながら、本実施例で用いられる現像
装置の構造を説明する。第１図中１は、感光体ドラムで
あり、この感光体ドラム１上に静電潜像が形成される。First, the structure of the developing device used in this embodiment will be explained with reference to FIG. 1 in FIG. 1 is a photoreceptor drum, and an electrostatic latent image is formed on this photoreceptor drum 1. As shown in FIG.
この感光体ドラム１と対向する位置に回転可能な非磁性
体よりなる現像スリーブ２が設置され、この現像スリー
ブ２の外周と接する部分に穂切り板３、現像スリーブ２
の上部に撹拌羽根４が設置されている。又、現像スリー
ブ２の内部には、反対磁性が隣り合わせになるように複
数個の搬送磁極６が配置され、感光体に対向する位置に
は、現像磁極７が配置されている。A rotatable developing sleeve 2 made of a non-magnetic material is installed at a position facing the photoreceptor drum 1, and a spike plate 3 and a developing sleeve 2 are placed in contact with the outer periphery of the developing sleeve 2.
A stirring blade 4 is installed on the upper part of the stirrer. Further, inside the developing sleeve 2, a plurality of transport magnetic poles 6 are arranged so that opposite magnetisms are adjacent to each other, and a developing magnetic pole 7 is arranged at a position facing the photoreceptor.
この現像磁極の１例について第２図にその斜視図、第３
図にその正面図を示した。この現像磁極７は円筒形でＮ
極とＳ極が交互に並んだ構造をしており、軸を中心に回
転可能である。An example of this developing magnetic pole is shown in a perspective view in Fig. 2 and in Fig. 3.
The front view is shown in the figure. This developing magnetic pole 7 is cylindrical and N
It has a structure in which poles and south poles are arranged alternately, and it can rotate around an axis.
次にこの現像装置の動作について説明する。Next, the operation of this developing device will be explained.
撹拌羽根４により、現像スリーブ２に搬送された現像剤
は、内部の磁極により現像スリーブ２上に着磁され、現
像スリーブ２上に現像剤の層を形成する。現像スリーブ
２は矢印Ａの方向に回転し、これにより現像スリーブ２
上に着磁された現像剤も矢印Ａの方向に移動し、穂切板
３で圧接されることにより均一な現像剤層が形成される
。感光体ドラム１と対向する位置に搬送された現像剤の
層は、現像磁極が矢印Ｂの方向に回転することにより乱
されて感光体と対向する位置において均一な現像剤の層
を形成する。これにより、感光体に対して均一な現像剤
の移行が行なわれるため、“ハキ目″がなく画像濃度が
均一な良好な画像が得られる。The developer conveyed to the developing sleeve 2 by the stirring blade 4 is magnetized onto the developing sleeve 2 by an internal magnetic pole, thereby forming a layer of developer on the developing sleeve 2. The developing sleeve 2 rotates in the direction of arrow A, and as a result, the developing sleeve 2
The developer magnetized above also moves in the direction of arrow A and is pressed against the cutting plate 3, thereby forming a uniform developer layer. The developer layer conveyed to the position facing the photoreceptor drum 1 is disturbed by the rotation of the developing magnetic pole in the direction of arrow B, and forms a uniform developer layer at the position facing the photoreceptor. As a result, the developer is uniformly transferred to the photoreceptor, so that a good image with uniform image density and no "cutting marks" can be obtained.
以上は本発明の一実施例であるが、本発明はこれに限る
ものではない。現像磁極７の構造としては第４図に示す
ように反対磁極が隣り合わせになるような十字型でも構
わない。又、上記実施例では現像磁極７を現像スリーブ
２と反対方向に回転させたが、現像磁極７の回転方向は
現像スリーブの回転方向と同じであっても同様の効果が
期待できる。Although the above is one embodiment of the present invention, the present invention is not limited thereto. The structure of the developing magnetic pole 7 may be a cross shape in which opposite magnetic poles are adjacent to each other as shown in FIG. Further, in the above embodiment, the developing magnetic pole 7 was rotated in the opposite direction to the developing sleeve 2, but the same effect can be expected even if the rotating direction of the developing magnetic pole 7 is the same as the rotating direction of the developing sleeve.
以上詳述したように本発明によれば、現像スリーブ上に
均一な現像剤の層が形成され、 ハキ目″のない均一な
画像濃度の良好な画像が得られる。As described in detail above, according to the present invention, a uniform layer of developer is formed on the developing sleeve, and a good image with uniform image density and no "cross-cut" can be obtained.
第１図は、本発明の現像装置の概略図、第２図は、本発
明の１実施例における現像磁極の斜視図、
第３図は、本発明の１実施例における現像磁極の正面図
、
第４図は、本発明の他の実施例における現像磁極の斜視
図である。
６・・・・・・搬送磁極
７・・・・・・現像磁極FIG. 1 is a schematic diagram of a developing device of the present invention, FIG. 2 is a perspective view of a developing magnetic pole in an embodiment of the present invention, and FIG. 3 is a front view of a developing magnetic pole in an embodiment of the present invention. FIG. 4 is a perspective view of a developing magnetic pole in another embodiment of the present invention. 6...Transporting magnetic pole 7...Developing magnetic pole
Claims (1)
る非磁性板と、 この非磁性板の内周面に沿って設けられた順次反対にし
た極性を有する複数個の搬送磁極と、前記非磁性板の内
周面の静電潜像支持体と対向する位置に設けられた回転
自在な現像磁極とを有する現像装置。[Scope of Claims] A collecting portion for collecting developer; a non-magnetic plate made of a rotatable non-magnetic material and forming a layer of developer on the surface; A developing device comprising a plurality of transport magnetic poles having sequentially opposite polarities, and a rotatable developing magnetic pole provided at a position facing the electrostatic latent image support on the inner peripheral surface of the non-magnetic plate. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20740588A JPH0256580A (en) | 1988-08-23 | 1988-08-23 | Developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20740588A JPH0256580A (en) | 1988-08-23 | 1988-08-23 | Developing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0256580A true JPH0256580A (en) | 1990-02-26 |
Family
ID=16539196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20740588A Pending JPH0256580A (en) | 1988-08-23 | 1988-08-23 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0256580A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8267192B2 (en) | 2009-02-24 | 2012-09-18 | Black & Decker Inc. | Ergonomic handle for power tool |
-
1988
- 1988-08-23 JP JP20740588A patent/JPH0256580A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8267192B2 (en) | 2009-02-24 | 2012-09-18 | Black & Decker Inc. | Ergonomic handle for power tool |
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