JPH0519632A - Developing device - Google Patents

Developing device

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Publication number
JPH0519632A
JPH0519632A JP16991291A JP16991291A JPH0519632A JP H0519632 A JPH0519632 A JP H0519632A JP 16991291 A JP16991291 A JP 16991291A JP 16991291 A JP16991291 A JP 16991291A JP H0519632 A JPH0519632 A JP H0519632A
Authority
JP
Japan
Prior art keywords
developer
developing
developing sleeve
toner
sleeve
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
Application number
JP16991291A
Other languages
Japanese (ja)
Inventor
Kazuo Yasuda
和夫 安田
Hiroyuki Tokimatsu
宏行 時松
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.)
Konica Minolta Inc
Original Assignee
Konica Minolta Inc
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 Konica Minolta Inc filed Critical Konica Minolta Inc
Priority to JP16991291A priority Critical patent/JPH0519632A/en
Publication of JPH0519632A publication Critical patent/JPH0519632A/en
Pending legal-status Critical Current

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  • Magnetic Brush Developing In Electrophotography (AREA)

Abstract

PURPOSE:To provide a developing device by which development without the unevenness of density is accomplished by regulating the layer thickness of developer on a developing sleeve which is carried toward a developing area so that it may be constant and where toner is not welded on the developing sleeve. CONSTITUTION:In the developing device which performs non-contact development by using two-component developer D consisting of magnetic carrier and toner, a magnetic roller 3 is provided in the developing sleeve 2, and a columnar bar 4 being a developer amount regulating body having rigidity and magnetism, which is pressed to the sleeve 2, is provided. After the surface of the sleeve 2 is worked so that the roughness may be Rz value 0.2-1.5mum by sand blast processing by irregular small particles first, it is worked so that the surface roughness may be within the range of Rz value 5-10mum by the sand blast processing by globular large particles.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、電子写真複写装置等に
おいて、磁性キャリア粒子とトナー粒子とを混合した2
成分現像剤を用いて静電潜像あるいは磁気潜像を非接触
状態で現像する現像装置に関するものである。
BACKGROUND OF THE INVENTION The present invention relates to a method of mixing magnetic carrier particles and toner particles in an electrophotographic copying machine.
The present invention relates to a developing device for developing an electrostatic latent image or a magnetic latent image in a non-contact state using a component developer.

【0002】[0002]

【従来の技術】従来、電子写真複写装置等においては、
磁性キャリアとトナーとからなる2成分現像剤を用いた
磁気ブラシ現像方式の現像装置が用いられている。この
現像装置は、内部に複数の磁極を有する磁石体からなる
マグネットローラを備え回転可能に支持された円筒状の
現像剤担持体である現像スリーブを有し、この現像スリ
ーブ表面にトナー粒子を付着させた磁性キャリアを保持
し現像領域に搬送して現像を行うもので、トナー粒子の
摩擦帯電制御が比較的容易で、トナー粒子の凝集が起こ
りにくく、磁気ブラシの穂立ちがよく接触現像に多く用
いられるが、像担持体面と非接触で現像する非接触現像
にも適していることから、キャリア粒子に対するトナー
粒子の量の管理を必要とするにも拘わらず用いられる。
2. Description of the Related Art Conventionally, in electrophotographic copying machines and the like,
A magnetic brush developing type developing device using a two-component developer composed of a magnetic carrier and a toner is used. This developing device has a developing sleeve, which is a cylindrical developer carrier, which is rotatably supported and has a magnet roller formed of a magnet body having a plurality of magnetic poles inside. Toner particles are attached to the surface of the developing sleeve. The developed magnetic carrier is held and conveyed to the developing area for triboelectrification control of toner particles. Although it is used, it is also suitable for non-contact development in which the development is carried out in non-contact with the surface of the image bearing member, so that it is used despite the need to control the amount of toner particles with respect to carrier particles.

【0003】非接触現像を行う上記磁気ブラシ現像方式
の現像装置において、濃度ムラのない一様な現像を行う
ためには、現像スリーブ上で現像領域へ搬送される現像
剤の層厚が薄く、かつ均一にすることが必要である。こ
のことは非接触現像においては特に重要である。
In the above-mentioned magnetic brush development type developing apparatus for non-contact development, in order to perform uniform development without density unevenness, the layer thickness of the developer conveyed to the developing area on the developing sleeve is small, And it is necessary to make it uniform. This is especially important in non-contact development.

【0004】従来、古くから用いられる固定規制板によ
り現像剤の層厚の規制がなされてきたが、現像剤担持体
と固定規制板との機械的取付け精度等にも限界があって
層厚として0.3mm程度が下限となっている。しかもこの
方法では均一でムラのない薄層を得ることは困難であっ
た。しかし均一な薄層を得る目的に添ったものとして固
定規制板以外の現像剤層厚規制装置が種々考案されてい
る。特に2成分現像剤を用いる現像装置に適した例を挙
げると、 (a)特開昭62-191868号及び特開昭62-191869号公報等
に非接触現像に適した現像スリーブ上に薄層の現像剤層
を形成する技術手段が開示されている。これは、支持部
材に支持された弾性板の先端を、現像スリーブ上の現像
剤の移動の上流方向に向け、かつその弾性板を上記現像
スリーブ上に押圧させ、これによって上記現像スリーブ
上に付着、搬送される磁性キャリアとトナーとを含む現
像剤の層厚を規制することによって、現像剤層厚を従来
の規制手段に比べて高精度で薄層に容易に設定可能とし
たものである。
Conventionally, the layer thickness of the developer has been regulated by a fixing regulation plate which has been used for a long time. However, there is a limit to the mechanical attachment accuracy between the developer carrier and the fixing regulation plate, and the layer thickness is limited. The lower limit is about 0.3 mm. Moreover, it was difficult to obtain a uniform and uniform thin layer by this method. However, various developer layer thickness regulating devices other than the fixed regulating plate have been devised to meet the purpose of obtaining a uniform thin layer. In particular, examples suitable for a developing device using a two-component developer include (a) a thin layer on a developing sleeve suitable for non-contact development as disclosed in JP-A-62-191868 and JP-A-62-191869. The technical means for forming the developer layer is disclosed. This is because the tip of the elastic plate supported by the support member is directed in the upstream direction of the movement of the developer on the developing sleeve, and the elastic plate is pressed onto the developing sleeve, so that the elastic plate adheres to the developing sleeve. By controlling the layer thickness of the developer containing the magnetic carrier and the toner to be conveyed, the developer layer thickness can be easily set to a thin layer with higher accuracy than the conventional regulation means.

【0005】(b)また、特開昭61-189582号、特開昭6
2-75563号公報に記載の現像装置では、固体板状層厚規
制部材を設けその背面に磁性体を配置し、現像剤担持体
内に設けた固定磁石体の吸引力によって間接的に規制板
の腹部或は折曲げエッジ部等を押圧させてその層厚を規
制しようとするものなどが開示されている。
(B) Further, JP-A-61-189582 and JP-A-6-189582.
In the developing device described in JP-A 2-75563, a solid plate-like layer thickness regulating member is provided and a magnetic body is disposed on the back surface thereof, and the attracting force of a fixed magnet body provided inside the developer carrying member indirectly regulates the regulating plate. It is disclosed that the abdomen or the bent edge is pressed to control the layer thickness.

【0006】しかしながら、上記の提案の(a)におい
ては、耐久性が短く、弾性板の取り付けに厳しい精度が
要求され量産に適しないという欠点がある。また(b)
においては、両磁石体間の距離変化による押圧変動を起
こし易く、均一な層厚を得ることができないという欠点
がある。
However, the above-mentioned proposal (a) has a drawback that it is not durable and is not suitable for mass production because the elastic plate is required to be attached with high precision. Also (b)
In the above, there is a drawback that a pressure variation is apt to occur due to a change in the distance between both magnet bodies, and a uniform layer thickness cannot be obtained.

【0007】[0007]

【発明が解決しようとする課題】上記従来の欠点を解決
すべく、本出願人は特開平2-50184号公報に記載のよう
に剛性かつ磁性を有する棒状の現像剤量規制体を用いた
現像装置の提案を行っている。この提案によって現像ス
リーブ上の均一な現像剤層厚を得ることができるように
なった。
In order to solve the above-mentioned conventional drawbacks, the present applicant has developed using a rod-shaped developer amount regulating member having rigidity and magnetism as described in JP-A No. 2-50184. We are proposing equipment. This proposal makes it possible to obtain a uniform developer layer thickness on the developing sleeve.

【0008】しかし、近来カラーコピーの高画質の要求
に応じて、トナーの小粒子化、低温定着化が行われるに
従い、現像剤の現像剤量規制体による薄層形成部におい
て、薄層形成部での摩擦熱によりトナーが軟化し、トナ
ーの現像スリーブへの融着が発生し易く、現像域への現
像剤の搬送量が低下し、コピー画像の濃度低下を起こし
たり、現像スリーブのクリーニング用のスクレーパにメ
クレを起こすなどの問題点があった。
However, in accordance with the recent demand for high image quality in color copying, as toner particles are made smaller and fixing at low temperature is performed, in the thin layer forming section by the developer amount regulating body of the developer, the thin layer forming section is formed. The toner softens due to frictional heat in the developing process, and the toner is apt to fuse to the developing sleeve, which reduces the amount of developer conveyed to the developing area, lowers the density of copy images, and cleans the developing sleeve. There was a problem such as causing scratches on the scraper.

【0009】本発明は、上記問題点を解決し、現像スリ
ーブにトナーの融着の発生がなく、現像スリーブのクリ
ーニング用のスクレーパにもメクレを起こすことなく、
現像スリーブ上の現像剤の層厚を一定に規制して濃度ム
ラのない現像を行うことの可能な現像装置を提供するこ
とを目的とする。
The present invention solves the above problems, no toner fusion occurs on the developing sleeve, and no scraping occurs on the scraper for cleaning the developing sleeve.
An object of the present invention is to provide a developing device capable of performing development without density unevenness by regulating the layer thickness of the developer on the developing sleeve to a constant value.

【0010】[0010]

【課題を解決するための手段】上記目的は、磁性キャリ
アとトナーとからなる2成分現像剤を収容し、内部に固
定された磁石体を有し表面上に現像剤を担持する剛性を
有する現像剤担持体と、前記磁石体に対向して該現像剤
担持体に押圧され、該現像剤担持体に担持された現像剤
の量を規制する剛性かつ磁性を有する材質からなる棒状
の現像剤量規制体とを備えた現像装置において、前記現
像剤担持体表面は不定形粒子によるサンドブラスト処理
等によってJISのRz値で0.2〜1.5μmのあらさとしたの
ち、球形大粒子によるサンドブラスト処理により前記R
z値で5〜10μmのあらさに加工したことを特徴とする現
像装置によって達成される。
SUMMARY OF THE INVENTION The above object is to provide a two-component developer containing a magnetic carrier and a toner, which has a magnet body fixed inside and has a rigidity for carrying the developer on the surface. A developer carrier and a rod-shaped developer amount made of a material having rigidity and magnetism, which is pressed against the developer carrier so as to face the magnet body and regulates the amount of the developer carried on the developer carrier. In a developing device equipped with a regulating body, the surface of the developer carrying body is roughened to have a JIS Rz value of 0.2 to 1.5 μm by sandblasting with irregular particles, and then the sandblasting with spherical large particles is used.
It is achieved by a developing device characterized by being processed to have a z value of 5 to 10 μm.

【0011】[0011]

【実施例】図1は、本発明装置の1実施例の断面図であ
って、1は矢示方向に回転し、表面にSe、CdSあるい
は有機光導電体等の感光体層を有し、図示しない帯電
器、露光装置によって表面に静電潜像を形成される像担
持体である感光体ドラム、2は非磁性材料からなる現像
剤担持体である現像スリーブ、3は現像スリーブ2の内
部に固定して設けられ表面に複数のN,S磁極を周方向
に有するマグネットローラで、この現像スリーブ2とマ
グネットローラ3とで現像剤搬送担体を構成している。
そして、現像スリーブ2は固定したマグネットローラ3
に対して回転可能であり、図の矢示方向に回転する。ま
た、マグネットローラ3のN,S磁極は通常500〜1,500
ガウスの磁束密度に磁化されており、その磁力によって
現像スリーブ2の表面に先に述べたような現像剤Dの層
即ち、磁気ブラシを形成する。4は磁気ブラシの高さ、
量を規制するため設けられた剛性率104Kg/cm2以上の剛
性を有する磁性体からなる円柱棒状の現像剤量規制体で
ある円柱棒、5は現像装置のハウジング、6は円柱棒4
と現像スリーブ2とが押圧されているにも拘わらず現像
剤Dを搬送可能にするためのバネ材であり、円柱棒4は
現像剤スリーブ2に対して現像剤Dが介在しない状態で
一定荷重で押圧される。7及び8は第1及び第2の撹拌
部材、9は供給ローラ、10は現像域12を通過した現像ス
リーブ2表面の現像剤を掻き落としてクリーニングする
スクレーパ、11は撹拌仕切り板である。
1 is a cross-sectional view of one embodiment of the device of the present invention, in which 1 is rotated in the direction of the arrow, and has a photosensitive layer such as Se, CdS or an organic photoconductor on the surface, A photoconductor drum, which is an image carrier on the surface of which an electrostatic latent image is formed by a charger (not shown) and an exposure device, 2 is a developing sleeve which is a developer carrier made of a non-magnetic material, and 3 is the inside of the developing sleeve 2. The developing roller 2 and the magnet roller 3 constitute a developer carrying carrier, which is a magnet roller fixedly provided on the surface of the magnet roller and having a plurality of N and S magnetic poles in the circumferential direction.
The developing sleeve 2 is fixed to the magnet roller 3
It is rotatable with respect to and rotates in the direction of the arrow in the figure. The N and S magnetic poles of the magnet roller 3 are usually 500 to 1,500.
It is magnetized to have a Gaussian magnetic flux density, and the magnetic force forms a layer of the developer D, that is, a magnetic brush, on the surface of the developing sleeve 2 as described above. 4 is the height of the magnetic brush,
A cylindrical rod, which is a cylindrical rod-shaped developer amount regulating member made of a magnetic material having a rigidity of 10 4 Kg / cm 2 or more, which is provided to regulate the amount, is a housing of the developing device, and 6 is a cylindrical rod 4.
Is a spring material for allowing the developer D to be conveyed despite the pressing of the developer sleeve 2 and the developing sleeve 2, and the cylindrical rod 4 has a constant load with the developer D intervening with respect to the developer sleeve 2. Pressed with. Reference numerals 7 and 8 are first and second stirring members, 9 is a supply roller, 10 is a scraper for scraping off and cleaning the developer on the surface of the developing sleeve 2 that has passed through the developing zone 12, and 11 is a stirring partition plate.

【0012】装置内に補給されたトナーは矢示方向に回
転する第1撹拌部材7と第2撹拌部材8とによってキャ
リアと十分に撹拌混合された上現像剤Dとして供給ロー
ラ9を介して現像スリーブ2に送られる。
The toner replenished in the apparatus is sufficiently agitated and mixed with the carrier by the first agitating member 7 and the second agitating member 8 which rotate in the arrow direction, and is developed as the upper developer D via the supply roller 9. It is sent to the sleeve 2.

【0013】前記第1撹拌部材7と第2撹拌部材8は互
いに相反する矢示方向に回転する左巻きの螺旋角をもっ
たスクリュー状の部材であって第2撹拌部材8の推力に
よって奥側に搬送されたトナーとキャリアは、図面の奥
側方向に上縁が低く傾斜する前記撹拌仕切り板11を順次
乗り越えて第1撹拌部材7側に移り、その推力によって
図面の手前側に搬送され、その間におけるトナーとキャ
リアとの混合作用によって摩擦帯電がなされた均質な現
像剤Dとされ、スポンジ状で矢示方向に回転する供給ロ
ーラ9によって現像スリーブ2周面上に層状に付着す
る。
The first stirring member 7 and the second stirring member 8 are screw-shaped members having a left-handed helix angle which rotate in mutually opposite arrow directions, and are pushed backward by the thrust of the second stirring member 8. The conveyed toner and carrier successively pass over the stirring partition plate 11 whose upper edge is slanted downward in the drawing and move to the first stirring member 7 side, where it is conveyed to the front side of the drawing by its thrust force. By the mixing action of the toner and the carrier in the above, a uniform developer D triboelectrically charged is formed, and is adhered in layers on the peripheral surface of the developing sleeve 2 by the supply roller 9 that is sponge-like and rotates in the arrow direction.

【0014】なお、この実施例で用いた現像剤Dは次の
ようなものである。キャリアとしては、微粒フェライト
を樹脂中に50wt%分散した重量平均粒径が50μm、磁化
の強さが30emu/g、抵抗率が1014Ωcm以上の熱による
球形化処理を行った磁性キャリアを用い、トナーにスチ
レン・アクリル樹脂(三洋化成製ハイマーup110)100
重量部、カーボンブラック(三菱化成製MA-100)10重量
部、ニグロシン5重量部からなる重量平均粒径が5μm
の粉砕造粒法によって得られた非磁性粒子からなるもの
を用い、供給ローラ9部における現像剤Dのトナー比率
がキャリアに対して5wt%になる条件で現像を行った。
トナーの平均帯電量は20μC/gであった。
The developer D used in this embodiment is as follows. As the carrier, a magnetic carrier which is 50 wt% of fine-grained ferrite dispersed in a resin, has a weight-average particle size of 50 μm, has a magnetization intensity of 30 emu / g, and has a resistivity of 10 14 Ωcm or more and is subjected to heat spheroidization. Styrene / acrylic resin (Haimer up110 manufactured by Sanyo Kasei) 100 for toner
5 parts by weight, consisting of 10 parts by weight, carbon black (MA-100 manufactured by Mitsubishi Kasei), and 5 parts by weight nigrosine
Using the non-magnetic particles obtained by the pulverization and granulation method of No. 3, development was performed under the condition that the toner ratio of the developer D in the 9 parts of the supply roller was 5 wt% with respect to the carrier.
The average charge amount of the toner was 20 μC / g.

【0015】この装置において、円柱棒4は直径6mmの
剛性かつ磁性を有するステンレス鋼とした。また、現像
スリーブ2は非磁性ステンレス鋼、アルミニウム等の非
磁性体からなり、その表面は現像剤Dの搬送性を低下さ
せず、しかもトナーの融着を防止するため次のような処
理を施した。まず不定形粒子を用いたサンドブラスト等
の処理を施して、表面あらさがJISのRz値で0.2〜1.5μ
mになるよう微細な凹凸を形成する。そののち前記微細
な凹凸を形成する際に発生する微少突起を取り除くため
球形大粒子によるサンドブラスト処理を施して前記Rz
値で5〜10μmになるよう処理した。この処理により微
少突起が減少し前記トナーの融着がなくなり現像剤Dの
搬送も十分に行われ均一な現像が行われるようになる。
In this apparatus, the cylindrical rod 4 is made of stainless steel having a diameter of 6 mm and having rigidity and magnetism. The developing sleeve 2 is made of a non-magnetic material such as non-magnetic stainless steel or aluminum, and the surface thereof is not subjected to the conveyance of the developer D and is subjected to the following treatment in order to prevent toner fusion. did. First, the surface roughness is 0.2-1.5μ in terms of JIS Rz value, after being subjected to treatment such as sandblasting using irregular particles.
Fine irregularities are formed to m. After that, in order to remove minute projections generated when the fine irregularities are formed, sandblasting with spherical large particles is performed to obtain the Rz.
The value was 5 to 10 μm. By this process, the minute protrusions are reduced, the toner is not fused, and the developer D is sufficiently conveyed to achieve uniform development.

【0016】前記マグネットローラ3は図1に示すよう
にN極及びS極を交互に等間隔に配置した等磁極の12極
の磁石からなるものであるが前記スクレーパ10の接する
部分において反発磁界を形成し、現像剤Dの剥離を容易
にするため1極欠落させて11極とし、前記現像スリーブ
2内で固定した状態にて内包され、現像スリーブ2表面
の円柱棒4の押圧位置での磁束密度を600ガウスとし
た。上記円柱棒4をマグネットローラ3の磁極に対向す
る位置で2〜6gf/mmの荷重がかかるようにし、これに
より円柱棒4は現像スリーブ2に押圧され、また誘磁さ
れた磁力によって吸引され押圧力を高め、現像スリーブ
2に均一に密着するようになり、均一でムラのないほぼ
7〜9mg/cm2の現像剤Dの搬送量が得られた。
As shown in FIG. 1, the magnet roller 3 is composed of magnets of 12 poles of equal magnetic poles in which N poles and S poles are alternately arranged at equal intervals, but a repulsive magnetic field is generated at a portion in contact with the scraper 10. In order to facilitate the peeling of the developer D, one pole is omitted to make 11 poles, and the magnetic flux is contained in the developing sleeve 2 in a fixed state, and the magnetic flux at the pressing position of the cylindrical rod 4 on the surface of the developing sleeve 2. The density was 600 gauss. A load of 2 to 6 gf / mm is applied to the cylindrical rod 4 at a position facing the magnetic pole of the magnet roller 3, whereby the cylindrical rod 4 is pressed by the developing sleeve 2 and is attracted and pressed by the magnetized magnetic force. By increasing the pressure, the developing sleeve 2 comes into close contact with the developing sleeve 2 uniformly, and a uniform and even amount of the developer D conveyed of about 7 to 9 mg / cm 2 was obtained.

【0017】以上のような現像装置において、現像スリ
ーブ2の感光体ドラム1に対する表面間隔を0.7mmに設
定して、感光体ドラム1の静電潜像を現像すると、現像
スリーブ2の表面に形成された磁気ブラシは、現像スリ
ーブ2の回転に伴ってその表面の磁束密度が変化するか
ら、振動しながら現像スリーブ2と共に移動し、現像域
12の感光体ドラム1との間隙を安定して円滑に通過し、
その際感光体ドラム1の表面に対し均一な現像効果を与
えることになって、安定して高いトナー濃度の現像を可
能にする。その際、さらにかぶりの発生を防ぎ、現像効
果を向上させるために、現像スリーブ2に振動する交流
成分を有するバイアス電圧を、図示しないバイアス電源
によって接地した感光体ドラム1の基体との間に印加さ
れている。このバイアス電圧は好ましい直流電圧と交流
電圧の重畳電圧が用いられ、直流成分がかぶりの発生を
防止し、交流成分が磁気ブラシに振動を与えて現像効果
を向上させる。なお、通常直流電圧成分には非画像部電
位とほぼ等しいか、それよりも高い50〜600Vの電圧が
用いられ、交流電圧成分には100Hz〜10KHz、好まし
くは1〜5KHzの周波数が用いられる。その結果現像
スリーブ2上の現像剤D中のトナーのみが選択的に感光
体ドラム1の静電潜像に向かって飛翔して付着する。
In the developing device as described above, when the surface distance of the developing sleeve 2 to the photosensitive drum 1 is set to 0.7 mm and the electrostatic latent image on the photosensitive drum 1 is developed, it is formed on the surface of the developing sleeve 2. Since the magnetic flux density on the surface of the magnetic brush thus changed changes with the rotation of the developing sleeve 2, the magnetic brush moves with the developing sleeve 2 while vibrating, and
It passes through the gap between 12 photosensitive drums 1 stably and smoothly,
At this time, a uniform developing effect is given to the surface of the photoconductor drum 1, and stable development with a high toner density is possible. At this time, in order to further prevent the occurrence of fogging and improve the developing effect, a bias voltage having an alternating component that vibrates in the developing sleeve 2 is applied between the developing sleeve 2 and the base body of the photosensitive drum 1 which is grounded by a bias power source (not shown). Has been done. The bias voltage is preferably a superimposed voltage of DC voltage and AC voltage. The DC component prevents fogging from occurring and the AC component gives vibration to the magnetic brush to improve the developing effect. A voltage of 50 to 600 V, which is substantially equal to or higher than the non-image portion potential, is used for the direct current voltage component, and a frequency of 100 Hz to 10 KHz, preferably 1 to 5 KHz is used for the alternating voltage component. As a result, only the toner in the developer D on the developing sleeve 2 selectively flies toward and is attached to the electrostatic latent image on the photosensitive drum 1.

【0018】現像域12においてトナー成分を消費した現
像剤Dはキャリア比率が高くなって現像スリーブ2によ
って搬送されて前記スクレーパ10により剥離回収され、
再びトナー比率の高い現像剤Dと混合される。
The developer D, which has consumed the toner component in the developing area 12, has a high carrier ratio and is conveyed by the developing sleeve 2 and separated and collected by the scraper 10.
It is again mixed with the developer D having a high toner ratio.

【0019】かくして、現像スリーブ2表面にトナーの
融着が発生せず、高濃度でムラのない高画質の画像の得
られる現像が行われた。
In this way, the toner was not fused on the surface of the developing sleeve 2, and the development was carried out so as to obtain a high density and high quality image without unevenness.

【0020】なお、本発明は反転現像にも用いることが
できる。その場合、直流電圧成分は感光体ドラム1の非
画像背景部における受容電位とほぼ等しい電圧に設定さ
れる。
The present invention can also be used for reversal development. In that case, the DC voltage component is set to a voltage substantially equal to the reception potential in the non-image background portion of the photosensitive drum 1.

【0021】(比較テスト)本発明者らは上記実施例
(D)とともに、現像スリーブ表面を次の3種類の表面
処理を行った(A)(B)(C)を用意した。
(Comparative Test) The inventors prepared (A), (B) and (C) in which the surface of the developing sleeve was subjected to the following three types of surface treatments together with the above-mentioned Example (D).

【0022】(A)不定形粒子によるサンドブラスト処
理によってJISのRZ値で0.2〜0.5μmのあらさに加工。
(A) Roughness of JIS R Z value of 0.2 to 0.5 μm is processed by sand blasting with amorphous particles.

【0023】(B)不定形粒子によるサンドブラスト処
理によってJISのRZ値で1〜3μmのあらさに加工。
[0023] (B) processing the roughness of 1~3μm at R Z value of JIS by sandblasting by irregular particles.

【0024】(C)不定形粒子によるサンドブラスト処
理によってJISのRZ値で1〜3μmのあらさに加工した
のちバフ磨きを行って0.3〜0.5μmのあらさに加工。
(C) After being processed to have a roughness of 1 to 3 μm according to JIS R Z value by sandblasting with irregular-shaped particles, buffing is performed to a roughness of 0.3 to 0.5 μm.

【0025】現像スリーブを(A)(B)(C)(D)
のものと交換し、他は本実施例と同一条件でテストを行
った。
The developing sleeves (A) (B) (C) (D)
The test was conducted under the same conditions as those of the present example except that they were replaced with those described above.

【0026】(D)不定形粒子によるサンドブラスト処
理によってJISのRZ値で0.2〜1.5μmのあらさに加工し
たのち球形大粒子によりサンドブラスト処理し、5〜10
μmのあらさに加工。(実施例) その結果次の評価が得られた。
(D) After sandblasting with irregular-shaped particles to a roughness of JIS R Z value of 0.2 to 1.5 μm, sandblasting with spherical large particles, 5 to 10
Processed to a roughness of μm. (Example) As a result, the following evaluations were obtained.

【0027】(A)実施例と比較して現像剤の搬送性は
やや劣るが比較的良好であった。但し8000コピー程度の
連続コピー後、チェックを行ったところ、円柱棒4の近
傍にはトナーの融着が認められた。また、現像剤の搬送
量に変化がみられた。
(A) The transportability of the developer was slightly inferior to that of the example, but was relatively good. However, when a check was performed after continuous copying of about 8000 copies, toner fusion was recognized in the vicinity of the cylindrical rod 4. In addition, there was a change in the amount of developer conveyed.

【0028】(B)実施例と比較して現像剤の搬送性は
良好であった。但し5000コピー程度の連続コピー後チェ
ックを行ったところ、現像スリーブ全面と円柱棒4の近
傍には顕著なトナーの融着が認められた。またスクレー
パ10にもメクレが生じていた。 (C)実施例と比較して現像剤の搬送性は悪く画像濃度
の低い現像しかなされなかった。
(B) The developer transportability was better than in the examples. However, when a check was performed after continuous copying of about 5000 copies, remarkable fusion of toner was found on the entire surface of the developing sleeve and in the vicinity of the cylindrical rod 4. In addition, the scraper 10 also had a crack. (C) The developer transportability was poor as compared with the examples, and only development with low image density was performed.

【0029】(D)8000コピーの連続コピーを行っても
何等異常が認められなかった。
(D) No abnormality was found after continuous copying of 8,000 copies.

【0030】[0030]

【発明の効果】以上説明したように剛性と磁性を有する
現像剤量規制体を備えた本発明の現像装置では、現像ス
リーブの表面を不定形小粒子によるサンドブラスト処理
等により微細な凹凸を設けたのち、球形大粒子によるサ
ンドブラスト処理を行った。その結果、現像スリーブ表
面にトナーの融着することがなくなり、現像スリーブ表
面をクリーニングするスクレーパにもメクレを起こすこ
となく、現像スリーブ上の現像剤の層厚を一定に規制し
て濃度ムラのない現像を行うことが可能になるという優
れた効果が得られた。
As described above, in the developing device of the present invention provided with the developer amount regulator having rigidity and magnetism, the surface of the developing sleeve is provided with fine irregularities by sandblasting with irregular small particles. After that, sandblasting with spherical large particles was performed. As a result, the toner is not fused to the surface of the developing sleeve, the scraper for cleaning the surface of the developing sleeve does not become messed up, and the layer thickness of the developer on the developing sleeve is regulated to a constant value to prevent uneven density. The excellent effect that development can be performed was obtained.

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

【図1】本発明の現像装置の1実施例を示す断面図であ
る。
FIG. 1 is a sectional view showing an embodiment of a developing device of the present invention.

【符号の説明】[Explanation of symbols]

1 感光体ドラム(像担持体) 2 現像スリーブ(現像剤担持体) 3 マグネットローラ 4 円柱棒(現像剤量規制体) 6 バネ材 10 スクレーパ 12 現像域 14 ホルダー D 現像剤 N,S 磁極 1 photoconductor drum (image bearing member) 2 developing sleeve (developer bearing member) 3 magnet roller 4 cylinder rod (developer amount regulating member) 6 spring material 10 scraper 12 developing area 14 holder D developer N, S magnetic pole

Claims (1)

【特許請求の範囲】 【請求項1】 磁性キャリアとトナーとからなる2成分
現像剤を収容し、内部に固定された磁石体を有し表面上
に現像剤を担持する現像剤担持体と、前記磁石体に対向
して該現像剤担持体に押圧され、該現像剤担持体に担持
された現像剤の量を規制する剛性かつ磁性を有する材質
からなる棒状の現像剤量規制体とを備え像担持体と非接
触で現像を行う現像装置において、前記現像剤担持体表
面は不定形粒子によるサンドブラスト処理等によってJI
SのRz値で0.2〜1.5μmのあらさとしたのち、球形大粒
子によるサンドブラスト処理により前記Rz値で5〜10
μmのあらさに加工したことを特徴とする現像装置。
Claim: What is claimed is: 1. A developer carrying body containing a two-component developer comprising a magnetic carrier and a toner, having a magnet body fixed inside, and carrying the developer on the surface thereof. A rod-shaped developer amount regulating member made of a material having rigidity and magnetism, which is pressed against the developer bearing member so as to face the magnet body and regulates the amount of the developer carried on the developer bearing member. In a developing device for developing in a non-contact manner with an image carrier, the surface of the developer carrier is subjected to JI
After the roughness of S of Rz is 0.2 to 1.5 μm, it is sandblasted with large spherical particles to give Rz of 5 to 10
A developing device characterized by being processed to a roughness of μm.
JP16991291A 1991-07-10 1991-07-10 Developing device Pending JPH0519632A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16991291A JPH0519632A (en) 1991-07-10 1991-07-10 Developing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16991291A JPH0519632A (en) 1991-07-10 1991-07-10 Developing device

Publications (1)

Publication Number Publication Date
JPH0519632A true JPH0519632A (en) 1993-01-29

Family

ID=15895270

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16991291A Pending JPH0519632A (en) 1991-07-10 1991-07-10 Developing device

Country Status (1)

Country Link
JP (1) JPH0519632A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6132915A (en) * 1999-02-10 2000-10-17 Fuji Xerox Co., Ltd. Image-forming process
US6146801A (en) * 1998-09-30 2000-11-14 Canon Kabushiki Kaisha Resin-coated carrier, two component type developer, and developing method
US6557140B2 (en) 1992-12-28 2003-04-29 Hitachi, Ltd. Disk array system and its control method
EP1333337A3 (en) * 2002-02-01 2003-10-08 Ricoh Company, Ltd. Image forming apparatus with a two-component type developer
US6725007B2 (en) * 2001-10-01 2004-04-20 Canon Kabushiki Kaisha Developing assembly and image-forming apparatus
US6757507B2 (en) 2000-12-20 2004-06-29 Ricoh Company, Ltd. Image formation apparatus using a dry two-component developer for development

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6557140B2 (en) 1992-12-28 2003-04-29 Hitachi, Ltd. Disk array system and its control method
US7185265B2 (en) 1992-12-28 2007-02-27 Hitachi, Ltd. Disk array system and its control method
US6146801A (en) * 1998-09-30 2000-11-14 Canon Kabushiki Kaisha Resin-coated carrier, two component type developer, and developing method
US6132915A (en) * 1999-02-10 2000-10-17 Fuji Xerox Co., Ltd. Image-forming process
US6757507B2 (en) 2000-12-20 2004-06-29 Ricoh Company, Ltd. Image formation apparatus using a dry two-component developer for development
US6902858B2 (en) 2000-12-20 2005-06-07 Ricoh Company, Ltd. Image formation apparatus using a dry two-component developer for development
US6725007B2 (en) * 2001-10-01 2004-04-20 Canon Kabushiki Kaisha Developing assembly and image-forming apparatus
EP1333337A3 (en) * 2002-02-01 2003-10-08 Ricoh Company, Ltd. Image forming apparatus with a two-component type developer
US6895203B2 (en) 2002-02-01 2005-05-17 Ricoh Company, Ltd. Developing method and apparatus using two-ingredient developer with prescribed coating of particles and resin
US7095971B2 (en) 2002-02-01 2006-08-22 Ricoh Company, Ltd. Developing method and apparatus using two-ingredient developer with prescribed coating of particles and resin
CN1316319C (en) * 2002-02-01 2007-05-16 株式会社理光 Developing method for using double component developer and imaging device using said method
US7283774B2 (en) 2002-02-01 2007-10-16 Ricoh Company, Ltd. Developing method using a two-ingredient type developer and image forming apparatus using the same

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