JPH0220991B2 - - Google Patents

Info

Publication number
JPH0220991B2
JPH0220991B2 JP5954884A JP5954884A JPH0220991B2 JP H0220991 B2 JPH0220991 B2 JP H0220991B2 JP 5954884 A JP5954884 A JP 5954884A JP 5954884 A JP5954884 A JP 5954884A JP H0220991 B2 JPH0220991 B2 JP H0220991B2
Authority
JP
Japan
Prior art keywords
developer
regulating
magnetic
magnetic force
regulation
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
Application number
JP5954884A
Other languages
Japanese (ja)
Other versions
JPS60203975A (en
Inventor
Nobuo Momotake
Yoshio Shoji
Takashi Yamamuro
Takayuki Sunaga
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Xerox Co Ltd filed Critical Fuji Xerox Co Ltd
Priority to JP5954884A priority Critical patent/JPS60203975A/en
Publication of JPS60203975A publication Critical patent/JPS60203975A/en
Publication of JPH0220991B2 publication Critical patent/JPH0220991B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
    • G03G15/0914—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush with a one-component toner

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Brush Developing In Electrophotography (AREA)

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、一成分現像における現像剤担持体上
の一成分磁性現像剤層の層厚を規制する現像剤規
制法に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a developer regulation method for regulating the layer thickness of a one-component magnetic developer layer on a developer carrier in one-component development.

従来技術 従来、電子複写機等において、一成分磁性現像
剤を用いて像担持体上の静電潜像を現像するため
の一成分現像装置としては、一般に第１図に示す
ような装置が使用されている。第１図において、
１は静電潜像２を保持できる像担持体であり、現
像装置は像担持体１と対向する位置に近接して配
置されている。Prior Art Conventionally, in electronic copying machines and the like, a device as shown in FIG. 1 is generally used as a one-component developing device for developing an electrostatic latent image on an image carrier using a one-component magnetic developer. has been done. In Figure 1,
Reference numeral 1 denotes an image carrier capable of holding an electrostatic latent image 2, and a developing device is disposed in close proximity to a position facing the image carrier 1.

現像装置は、内部に回転しないように固定され
た複数の磁極を交互に配設してなるマグネツトロ
ール４を有し、該マグネツトロール４の周囲に回
転自在に軸止された非磁性円筒状の現像剤担持体
５と、該現像剤担持体５上の現像剤層の層厚を規
制するため、その上部に配設された規制ブレード
６とを有し、いずれも磁性現像剤３を収容するた
めのホツパー７内に配設されており、また現像剤
担持体５は前記像担持体１と近接して配設されて
いる。 The developing device has a magnet roll 4 in which a plurality of magnetic poles fixed so as not to rotate are arranged alternately, and a non-magnetic cylinder rotatably fixed around the magnet roll 4. The developer carrier 5 has a shape of a developer carrier 5, and a regulation blade 6 disposed on the upper part of the developer carrier 5 to regulate the layer thickness of the developer layer on the developer carrier 5. The developer carrier 5 is disposed in a hopper 7 for accommodating the developer, and the developer carrier 5 is disposed close to the image carrier 1.

このような現像装置においては、ホツパー７内
に供給された磁性現像剤３は、マグネツトロール
４の磁力により現像剤担持体５面上に保持され
て、該現像剤担持体の回転に伴ない、像担持体１
と現像剤担持体５とが対向する現像領域へ送り込
まれ、ここで静電潜像２の現像が行なわれる。 In such a developing device, the magnetic developer 3 supplied into the hopper 7 is held on the surface of the developer carrier 5 by the magnetic force of the magnet roll 4, and is rotated as the developer carrier rotates. , image carrier 1
and the developer carrier 5 are fed into the opposing development area, where the electrostatic latent image 2 is developed.

前記現像剤担持体５上の現像剤層の層厚を規制
する手段としては、各種のブレードが提案されて
いる。 Various types of blades have been proposed as means for regulating the thickness of the developer layer on the developer carrier 5.

しかしながら、磁性ブレードを用い、現像剤担
持体５上の現像剤付着量を１〜３mg／cm2とした現
像方法においては、背景部のカブリをなくすため
に、現像剤担持体５に印加する現像バイアスとし
て交番電界を使用する必要があつた（図示せず）。
一方、非磁性ブレードを用い、現像剤担持体５上
の現像剤付着量を10〜30mg／cm2に規制するDCバ
イアスの現像方式では、例えば、オリジナルの原
稿濃度に対してコピー画像の濃度が直線的に低減
せず、オリジナル濃度が低濃度域においてコピー
画像の濃度が急激に低下する。いわゆる低濃度ラ
イン再現不良や、ラインの太り、ライン周囲に斑
点が付着するフリンジ現象などの画質欠陥がみら
れた。 However, in a developing method in which a magnetic blade is used and the developer adhesion amount on the developer carrier 5 is 1 to 3 mg/cm 2 , in order to eliminate fogging in the background area, the developing method is applied to the developer carrier 5. It was necessary to use an alternating electric field as a bias (not shown).
On the other hand, in a DC bias development method that uses a non-magnetic blade and regulates the amount of developer adhered on the developer carrier 5 to 10 to 30 mg/cm 2 , for example, the density of the copy image is lower than the density of the original document. The density of the copy image does not decrease linearly, and the density of the copy image decreases rapidly in the low density area of the original density. Image quality defects such as poor reproduction of so-called low-density lines, thick lines, and fringing phenomena in which spots are attached around the lines were observed.

前記問題を解決するために、現像剤付着量を３
〜６mg／cm2とする規制方法（トリミング方法）が
試みられたが、規制ブレードと現像剤担持体５と
の規制部間隙（トリマーギヤツプ）を0.1〜0.2mm
とする必要があり、トリマー詰りが発生した。ま
た、このトリマー詰りを改善する方法として、規
制部に対向するマグネツトロールの磁力を反撥極
とすることが試みられたが、この方法ではトリマ
ー詰りは改善されるが、反撥磁極部に現像剤の溜
りが発生し、安定した現像剤層が得られなかつ
た。 In order to solve the above problem, the amount of developer attached was reduced to 3.
A regulating method (trimming method) of ~6 mg/cm 2 was attempted, but the trimmer gap between the regulating blade and the developer carrier 5 was set to 0.1 to 0.2 mm.
The trimmer was clogged. In addition, as a method to improve this trimmer clogging, attempts have been made to use the magnetic force of the magnet roll facing the regulating section as a repellent pole, but although this method improves the trimmer clogging, the developer stagnation occurred, and a stable developer layer could not be obtained.

発明の目的 従つて、本発明の目的は、前記トリマー詰りな
どの問題がなく、現像剤担持体上に安定した現像
剤層を形成できる現像剤規制方法を提供すること
にある。OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to provide a developer regulating method that is free from problems such as the trimmer clogging and that can form a stable developer layer on a developer carrier.

発明の構成 本発明に係る現像剤規制方法は、前記したよう
な現像剤担持体上の一成分磁性現像剤を規制ブレ
ードによつて規制する方法において、規制ブレー
ドに対向する位置のマグネツトロールの磁力を同
極反撥とすると共に、該磁力の強さを規制部入口
側よりも規制部出口側で強くしたことを特徴とす
るものである。Structure of the Invention The developer regulating method according to the present invention is a method for regulating one-component magnetic developer on a developer carrier as described above using a regulating blade. It is characterized in that the magnetic force is homopolar repulsion, and the strength of the magnetic force is made stronger on the regulating part exit side than on the regulating part entrance side.

発明の作用及び態様 以下、本発明の作用及び各種態様について図面
を参照しながら説明する。なお、第１図に示す従
来装置と同一機能の部品については、説明の便宜
上同一の符号を使用し、また既に説明した各部品
の機能、配置態様等についての説明は省略する。Effects and aspects of the invention The effects and various aspects of the invention will be described below with reference to the drawings. For convenience of explanation, parts having the same functions as those of the conventional device shown in FIG.

第２図は本発明に係る現像剤規制方法を採用し
た一成分現像装置の一例の概略構成を示し、非磁
性体からなる規制ブレード６に対向するマグネツ
トロール４の位置に同極反撥磁極（N1，N2）が
配置されている。該同極反撥磁極（N1，N2）
は、第３図に示すような磁力勾配を有し、磁力の
強さは規制部入口側よりも規制部出口側で強くな
るように、好ましくは規制部入口側（N1）の磁
力が300〜700ガウス（Gauss）、規制部出口側
（N2）の磁力が800〜1200ガウスとなるように設
定する。 FIG. 2 shows a schematic configuration of an example of a one-component developing device employing the developer regulating method according to the present invention. N 1 , N 2 ) are arranged. The same-polarity repulsive magnetic pole (N 1 , N 2 )
has a magnetic force gradient as shown in Fig. 3, and preferably the magnetic force on the regulating part entrance side (N 1 ) is 300% so that the strength of the magnetic force is stronger on the regulating part exit side than on the regulating part entrance side. Set so that the magnetic force is ~700 Gauss, and the magnetic force on the exit side (N 2 ) of the regulating section is 800 ~ 1200 Gauss.

本発明に従つて、現像剤担持体５上の現像剤層
厚を規制する場合の作用について、第４図及び第
５図を参照しながら説明する。 The effect of regulating the thickness of the developer layer on the developer carrier 5 according to the present invention will be described with reference to FIGS. 4 and 5.

第４図に同極反撥の各磁極の磁力を同一に設定
したとき（N1＝N2＝800ガウス）の現像剤３の
流れを示す。このような場合には、現像剤担持体
５の回転方向に従つて、現像剤３の流れの上流側
に現像剤の溜りが発生する（第４図参照）。この
ため、この位置でトリミングを行なつた場合、現
像剤担持体上の搬送ムラが発生し、安定な現像剤
層が得られない。これに対し、同極反撥磁極を、
例えばN1＝500ガウス、N2＝1000ガウスという
ように磁力勾配をもつ構成の同極反撥とした場
合、第５図に示すような現像剤３の流れを示し、
現像剤溜りの発生はなくなり、トリミング時の搬
送ムラは発生しない。また、同極反撥極とするこ
とにより、規制部で現像剤チエーンが立つている
状態で規制ブレードが現像剤チエーンをカツトす
るため、現像剤担持体上の付着量を少なくでき
る。 FIG. 4 shows the flow of the developer 3 when the magnetic force of each magnetic pole of homopolar repulsion is set to be the same (N 1 =N 2 =800 Gauss). In such a case, a pool of developer is generated on the upstream side of the flow of developer 3 according to the rotational direction of developer carrier 5 (see FIG. 4). Therefore, if trimming is performed at this position, uneven conveyance occurs on the developer carrier, making it impossible to obtain a stable developer layer. On the other hand, the homopolar repulsive magnetic pole,
For example, in the case of homopolar repulsion with a magnetic force gradient such as N 1 = 500 Gauss and N 2 = 1000 Gauss, the flow of the developer 3 will be as shown in FIG.
There is no longer a developer pool, and no uneven conveyance occurs during trimming. Further, by using the homopolar repelling poles, the regulating blade cuts the developer chain while the developer chain is standing in the regulating portion, so that the amount of adhesion on the developer carrier can be reduced.

実施例 第２図に示す装置において、規制部のマグネツ
トロール４の同極反撥磁極（N1，N2）の構成
を、規制部入口側磁力N1＝500ガウス、出口側磁
力N2＝1000ガウスとし、規制部材として非磁性
体の規制ブレード６を用い、非磁性円筒状の現像
剤担持体５と規制ブレード６との間隙を0.3mmに
設定して現像剤層の規制を行なつたところ、現像
剤付着量は６mg／cm2となり、均一な現像剤層が形
成された。また、トリマー詰りに対しても問題の
ないことが確認された。また当然のことながら、
現像剤担持体上の搬送ムラは生じなかつた。Example In the device shown in FIG. 2, the structure of the homopolar repelling magnetic poles (N 1 , N 2 ) of the magnet roll 4 of the regulating section is such that the magnetic force on the entrance side of the regulating section N 1 = 500 Gauss, and the magnetic force on the exit side N 2 = 1000 Gauss, a non-magnetic regulating blade 6 was used as a regulating member, and the gap between the non-magnetic cylindrical developer carrier 5 and the regulating blade 6 was set to 0.3 mm to regulate the developer layer. The amount of developer deposited was 6 mg/cm 2 , and a uniform developer layer was formed. It was also confirmed that there was no problem with trimmer clogging. Also, of course,
No unevenness in conveyance on the developer carrier occurred.

発明の効果 以上のように、本発明の現像剤規制方法によれ
ば、規制ブレードに対向する位置の磁力を同極反
撥とし、かつ該磁力の強さが規制部入口側よりも
規制部出口側で強くされることにより、規制部入
口側に発生する現像剤の溜りは抑制され、トリマ
ー詰りもなく安定に、現像剤担持体上に均一な現
像剤層を形成できる。Effects of the Invention As described above, according to the developer regulating method of the present invention, the magnetic force at the position facing the regulating blade is homopolar repulsive, and the strength of the magnetic force is higher on the regulating part outlet side than on the regulating part entrance side. By increasing the strength, the accumulation of developer generated on the entrance side of the regulating portion is suppressed, and a uniform developer layer can be stably formed on the developer carrier without clogging the trimmer.

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

第１図は従来の一成分現像装置の概略説明図、
第２図は本発明に係る現像剤規制方法を用いた一
成分現像装置の一例を示す概略説明図、第３図は
同極反撥磁極の磁力分布の一例を示すグラフ、第
４図及び第５図は同極反撥磁極を用いた現像剤規
制方法の作用説明図である。 １…像担持体、３…一成分磁性現像剤、４…マ
グネツトロール、５…現像剤担持体、６…規制ブ
レード。 FIG. 1 is a schematic explanatory diagram of a conventional one-component developing device.
FIG. 2 is a schematic explanatory diagram showing an example of a one-component developing device using the developer regulating method according to the present invention, FIG. 3 is a graph showing an example of the magnetic force distribution of homopolar repelling magnetic poles, and FIGS. The figure is an explanatory diagram of the operation of a developer regulating method using homopolar repelling magnetic poles. DESCRIPTION OF SYMBOLS 1... Image carrier, 3... One-component magnetic developer, 4... Magnet roll, 5... Developer carrier, 6... Regulation blade.

Claims (1)

【特許請求の範囲】 １ 内部に回転しないように固定された複数の磁
極からなるマグネツトロールを有し、該マグネツ
トロールの周囲に回転自在に軸止された非磁性円
筒状の現像剤担持体上の一成分磁性現像剤を規制
ブレードによつて規制する現像剤規制法におい
て、規制ブレードに対向する位置の磁力を同極反
撥とすると共に、該磁力の強さを規制部入口側よ
りも規制部出口側で強くしたことを特徴とする現
像剤規制方法。 ２ 前記同極反撥の磁力が、規制部入口側で300
〜700ガウス、規制部出口側で800〜1200ガウスで
あることを特徴とする特許請求の範囲第１項に記
載の現像剤規制方法。[Scope of Claims] 1. A non-magnetic cylindrical developer carrier having a magnet roll consisting of a plurality of magnetic poles fixed so as not to rotate therein, and rotatably pivoted around the magnet roll. In the Developer Regulation Law, which regulates the one-component magnetic developer on the body using a regulation blade, the magnetic force at the position facing the regulation blade is homopolar repulsion, and the strength of the magnetic force is set to be higher than that at the entrance of the regulation part. A developer regulation method characterized in that the regulation part is made stronger on the exit side. 2 The magnetic force of the homopolar repulsion is 300 on the regulating part entrance side.
700 Gauss, and 800 to 1200 Gauss on the exit side of the regulating section.
JP5954884A 1984-03-29 1984-03-29 Control method of developer Granted JPS60203975A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5954884A JPS60203975A (en) 1984-03-29 1984-03-29 Control method of developer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5954884A JPS60203975A (en) 1984-03-29 1984-03-29 Control method of developer

Publications (2)

Publication Number Publication Date
JPS60203975A JPS60203975A (en) 1985-10-15
JPH0220991B2 true JPH0220991B2 (en) 1990-05-11

Family

ID=13116419

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5954884A Granted JPS60203975A (en) 1984-03-29 1984-03-29 Control method of developer

Country Status (1)

Country Link
JP (1) JPS60203975A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH056103A (en) * 1990-10-25 1993-01-14 Fuji Xerox Co Ltd Developing apparatus
JPH04330475A (en) * 1991-01-11 1992-11-18 Minolta Camera Co Ltd Developing device

Also Published As

Publication number Publication date
JPS60203975A (en) 1985-10-15

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