JPH0545955B2 - - Google Patents
Info
- Publication number
- JPH0545955B2 JPH0545955B2 JP1017199A JP1719989A JPH0545955B2 JP H0545955 B2 JPH0545955 B2 JP H0545955B2 JP 1017199 A JP1017199 A JP 1017199A JP 1719989 A JP1719989 A JP 1719989A JP H0545955 B2 JPH0545955 B2 JP H0545955B2
- Authority
- JP
- Japan
- Prior art keywords
- developing
- doctor
- gap
- developer
- 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.)
- Expired - Lifetime
Links
Landscapes
- Magnetic Brush Developing In Electrophotography (AREA)
Description
【発明の詳細な説明】
この発明は、電子写真装置や静電記録装置にお
ける磁気ブラシ現像装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic brush developing device for an electrophotographic device or an electrostatic recording device.
磁気ブラシ現像装置とは、内部に磁石を収容し
た現像スリーブ上に磁性現像剤を吸着して現像剤
によるブラシを形成し、これを潜像担体上に形成
された静電潜像に接触させて現像を行なう装置で
ある。磁性現像剤には、磁性キヤリアと樹脂トナ
ーからなる二成分系現像剤と、樹脂トナーに磁性
粉を混入させた一成分系磁性トナーがある。現像
スリーブは、通常、非磁性金属材料でできてお
り、現像電極を兼ねている。現像電極は、いわゆ
るエツジ効果を防止するもので、潜像担体との間
〓すなわち現像ギヤツプを小さくすればするほ
ど、現像能力が上がり、べた部のうまりのよい、
階調性のよい画像が得られる。しかし、それに応
じて、そこへ流れる現像剤の流量を少なくしない
と、現像部で現像剤がブロツキングを起こし、地
汚れ、まだら状の画像ができてしまう。現像部へ
の現像剤の流量の制御は、ドクターと呼ばれるブ
レードの掻取りによつて行なわれるが、ドクター
先端と現像スリーブとの間〓すなわちドクターギ
ヤツプを小さな値に精度良く維持することは、な
かなか難しく、またドクターギヤツプが小さい
と、そこに現像剤や異物が詰まつて、現像むらを
生じさせることもある。 A magnetic brush developing device is a developing device that attracts magnetic developer onto a developing sleeve containing a magnet inside to form a developer brush, which is brought into contact with an electrostatic latent image formed on a latent image carrier. This is a device that performs development. Magnetic developers include two-component developers made of a magnetic carrier and resin toner, and one-component magnetic toners made of resin toner mixed with magnetic powder. The developing sleeve is usually made of a non-magnetic metal material and also serves as a developing electrode. The developing electrode prevents the so-called edge effect, and the smaller the gap between the developing electrode and the latent image carrier, the higher the developing ability and the better the solid area.
An image with good gradation can be obtained. However, unless the flow rate of the developer flowing there is reduced accordingly, the developer will cause blocking in the developing section, resulting in background smudges and mottled images. The flow of developer to the developing section is controlled by scraping with a blade called a doctor, but it is quite difficult to precisely maintain the doctor gap between the doctor tip and the developing sleeve at a small value. Also, if the doctor gap is small, developer and foreign matter may become clogged there, causing uneven development.
この発明によれば、ドクター部における現像ス
リーブ上の現像剤の移動速度よりも、現像部にお
ける現像スリーブ上の現像剤の移動速度のほうを
速くした磁気ブラシ現像装置が提供される。ドク
ター部における現像剤流量は、ドクターギヤツプ
Gdとそこを通過する現像剤の移動速度v1との積
で表わされ、現像部における現像剤流量は、現像
ギヤツプGpとそこを通過する現像剤の移動速度
v2との積で表わされる。したがつて、v1＜v2にす
れば、ドクターギヤツプGdを比較的大きくして
も、現像部における適正な現像剤流量が得られ
る。これにより、現像ギヤツプGpは従来通り狭
くしても、ドクターギヤツプGdを従来よりも広
く取ることができるので、精度維持が簡単でしか
もドクター部における現像剤や異物の詰まりがな
くなる。 According to the present invention, there is provided a magnetic brush developing device in which the moving speed of the developer on the developing sleeve in the developing section is faster than the moving speed of the developer on the developing sleeve in the doctor section. The developer flow rate in the doctor section is determined by the doctor gap.
It is expressed as the product of Gd and the moving speed v 1 of the developer passing through it, and the developer flow rate in the developing section is the developing gap Gp and the moving speed of the developer passing therethrough.
It is expressed as the product of v 2 . Therefore, if v 1 <v 2 , even if the doctor gap Gd is made relatively large, an appropriate developer flow rate in the developing section can be obtained. As a result, even though the developing gap Gp is narrow as before, the doctor gap Gd can be made wider than before, making it easy to maintain accuracy and eliminating clogging of developer and foreign matter in the doctor section.
したがつて、この発明の目的は、現像ギヤツプ
を狭くして高品質の現像画像を得るとともに、ド
クターギヤツプを広くして精度維持の簡単で異物
等の詰まりのない磁気ブラシ現像装置を提供する
ことにある。 Therefore, an object of the present invention is to provide a magnetic brush developing device that narrows the developing gap to obtain high-quality developed images, widens the doctor gap, easily maintains precision, and is free from clogging with foreign matter. be.
上記の目的は、図面を参照した以下の説明から
さらに明らかになる。図には本発明の一実施例が
示されている。 The above objects will become clearer from the following description with reference to the drawings. An embodiment of the invention is shown in the figure.
現像容器２１の中には、時計回り方向に回転す
る現像スリーブ２２が配置されており、その内部
には、下方に汲上げ磁石２３、左側方に中間磁石
２４，２５、上方に現像磁石２６が、それぞれの
磁極を図示のように定めて配置されている。中間
磁石２４の左側方の現像容器壁面には、ドクター
ギヤツプGdをもつてドクター２７が設けられて
おり、現像スリーブ２２は、感光体ドラム１７に
対し、現像ギヤツプGpをもつて配置されている。 A developing sleeve 22 that rotates clockwise is arranged inside the developing container 21, and inside thereof there are a pumping magnet 23 at the bottom, intermediate magnets 24 and 25 at the left side, and a developing magnet 26 at the top. , are arranged with their respective magnetic poles defined as shown. A doctor 27 is provided on the wall surface of the developer container on the left side of the intermediate magnet 24 with a doctor gap Gd, and the developer sleeve 22 is disposed with respect to the photosensitive drum 17 with a developer gap Gp.
作用を説明すると、現像容器２１内の一成分系
磁成トナー１８は、まず汲上げ磁石２３によつて
現像スリーブ２２表面に吸着され、磁石２３と磁
石２４との間の磁界に保持されて、現像スリーブ
２２表面の移動に伴つて移動する。現像スリーブ
２２上の現像剤がドクター２７との間を通ると
き、その部分には同極側を近接して配置した磁石
２４，２５によつて反発磁界が生じているので、
スリーブ上の現像剤は、一時的に磁石２４よりも
下流側に留まろうとし、スリーブ表面の移動速度
よりも遅くなる。このように反発磁界による抑制
を受けながらドクター部を通過したスリーブ上の
現像剤は、磁石２５，２６による磁界に保持され
てさらに搬送され、磁石２６の位置で感光体上の
静電潜像に接触し、これを現像する。このときの
現像剤の移動速度はスリーブ表面の移動速度と同
じである。 To explain the operation, the one-component magnetic toner 18 in the developer container 21 is first attracted to the surface of the developer sleeve 22 by the pumping magnet 23, and is held by the magnetic field between the magnets 23 and 24. It moves as the surface of the developing sleeve 22 moves. When the developer on the developing sleeve 22 passes between the doctor 27 and the doctor 27, a repulsive magnetic field is generated in that part by the magnets 24 and 25, which have the same polarity close to each other.
The developer on the sleeve tends to temporarily stay downstream of the magnet 24, and moves at a slower speed than the surface of the sleeve. The developer on the sleeve, which has passed through the doctor section while being suppressed by the repulsive magnetic field, is held by the magnetic fields of the magnets 25 and 26 and further conveyed, and forms an electrostatic latent image on the photoreceptor at the position of the magnet 26. Contact it and develop it. The moving speed of the developer at this time is the same as the moving speed of the sleeve surface.
ドクター部を通過する現像剤の流量は、単位
幅、単位時間当り、Gd・v1であり、現像部を通
過する現像剤の流量は、同様にしてGp・v2であ
る。好ましい現像条件は、両者の関係を適正に選
ぶことにより与えられるが、両者が一定の関係を
有する場合、v2をv1よりも大きくすることによ
り、ドクターギヤツプGdを相対的に大きく取る
ことができる。 The flow rate of the developer passing through the doctor part is Gd·v 1 per unit width and unit time, and the flow rate of the developer passing through the developing part is similarly Gp·v 2 . Preferred development conditions are given by appropriately selecting the relationship between the two, but if the two have a certain relationship, the doctor gap Gd can be made relatively large by making v 2 larger than v 1 . .
以上、この発明を図示の実施例にもとづいて説
明してきたが、この発明は種々の変更が可能であ
り、特許請求の範囲に記載したこの発明の精神お
よび範囲内のすべての変更は、この発明に含まれ
るものである。 Although this invention has been described above based on the illustrated embodiments, this invention can be modified in various ways, and all modifications within the spirit and scope of this invention as described in the claims are within the scope of this invention. It is included in
図は、この発明による磁気ブラシ現像装置の一
例を示す概略図である。
２２……現像スリーブ、２７……ドクター、１
７……感光体ドラム、Gp……現像ギヤツプ、Gd
……ドクターギヤツプ。
The figure is a schematic diagram showing an example of a magnetic brush developing device according to the present invention. 22...Developing sleeve, 27...Doctor, 1
7...Photoconductor drum, Gp...Development gap, Gd
...Doctor Gap.
Claims (1)
て配置され、複数の磁石を円周方向に並べて内蔵
した現像スリーブと、上記現像スリーブの周面と
の間にドクターギヤツプGdをもつて配置され、
上記現像スリーブ上に磁気的に吸着された現像剤
の上記現像ギヤツプへの供給量を、現像剤を掻き
取ることにより規制するドクターとを具備し、上
記現像スリーブ上の現像剤を上記潜像担持体上の
静電潜像に接触させて現像を行う磁気ブラシ現像
装置において、 上記磁石のうち上記ドクターギヤツプの近傍に
並んだ磁極を同極とし、この同極の磁極のうち
の、現像スリーブの回転方向上流側の磁極に上記
ドクターを対向させ、かつ上記ドクターギヤツプ
Gdを上記現像ギヤツプGpよりも大きく設定した
ことを特徴とする磁気ブラシ現像装置。[Claims] 1. A developing sleeve disposed with a developing gap Gp between it and the latent image carrier and containing a plurality of magnets arranged in the circumferential direction, and a doctor gap between the peripheral surface of the developing sleeve. placed with Gd,
a doctor that regulates the amount of developer magnetically adsorbed on the developing sleeve to be supplied to the developing gap by scraping off the developer; In a magnetic brush developing device that develops by bringing it into contact with an electrostatic latent image on a body, the magnetic poles of the magnets arranged near the doctor gap are of the same polarity, and the rotation of the developing sleeve among the magnetic poles of the same polarity is used. Place the doctor facing the magnetic pole on the upstream side of the direction, and place the doctor gap
A magnetic brush developing device characterized in that Gd is set larger than the developing gap Gp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1719989A JPH01221776A (en) | 1989-01-26 | 1989-01-26 | magnetic brush developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1719989A JPH01221776A (en) | 1989-01-26 | 1989-01-26 | magnetic brush developing device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10794280A Division JPS5732462A (en) | 1980-08-06 | 1980-08-06 | Magnetic brush developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01221776A JPH01221776A (en) | 1989-09-05 |
| JPH0545955B2 true JPH0545955B2 (en) | 1993-07-12 |
Family
ID=11937269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1719989A Granted JPH01221776A (en) | 1989-01-26 | 1989-01-26 | magnetic brush developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01221776A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100583437B1 (en) * | 2003-10-13 | 2006-05-26 | 삼성전자주식회사 | Electrophotographic laser printer |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5329462Y2 (en) * | 1973-10-26 | 1978-07-24 | ||
| JPS5226837A (en) * | 1975-08-25 | 1977-02-28 | Kanebo Ltd | Process for supplying an electrophotographic developer and device ther efor |
| JPS598831B2 (en) * | 1977-09-10 | 1984-02-27 | キヤノン株式会社 | Toner layer forming device |
| JPS5453524A (en) * | 1977-10-05 | 1979-04-26 | Mitsubishi Electric Corp | Diaphragm for speakers |
| JPS55107942A (en) * | 1979-02-13 | 1980-08-19 | Matsushita Electric Works Ltd | Inspecting method of plate |
| JPS5732462A (en) * | 1980-08-06 | 1982-02-22 | Ricoh Co Ltd | Magnetic brush developing device |
-
1989
- 1989-01-26 JP JP1719989A patent/JPH01221776A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01221776A (en) | 1989-09-05 |
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