JPH052340A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPH052340A JPH052340A JP15347791A JP15347791A JPH052340A JP H052340 A JPH052340 A JP H052340A JP 15347791 A JP15347791 A JP 15347791A JP 15347791 A JP15347791 A JP 15347791A JP H052340 A JPH052340 A JP H052340A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- developer
- magnetic pole
- developing sleeve
- developing
- 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.)
- Withdrawn
Links
Landscapes
- Magnetic Brush Developing In Electrophotography (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は複写機、プリンタ等の電
子写真方式の画像形成装置における現像装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device in an electrophotographic image forming apparatus such as a copying machine or a printer.
【0002】[0002]
【従来の技術】電子写真方式の画像形成装置における現
像装置は種々のタイプのものが知られているが、代表的
なものの一つとして、磁石体、前記磁石体の周囲を回転
できる現像スリーブ及び前記現像スリーブに臨む現像剤
規制部材を備え、現像剤を前記磁石体の磁力に基づいて
前記現像スリーブ上に保持し、該スリーブの回転によ
り、前記規制部材にて搬送量を規制しつつ現像領域へ搬
送できる現像装置がある。2. Description of the Related Art Various types of developing devices in an electrophotographic image forming apparatus are known, and as typical ones, a magnet body, a developing sleeve capable of rotating around the magnet body, and A developing agent regulating member facing the developing sleeve is provided, the developing agent is held on the developing sleeve based on the magnetic force of the magnet body, and the rotation of the sleeve regulates the transport amount by the regulating member, and the developing area. There is a developing device that can be transported to.
【0003】このタイプの現像装置では、しばしば現像
剤の固まり(凝集物)や紙粉等のために現像剤規制部材
において目詰まりが発生し、その下流側に現像剤が搬送
されなくなり、これが画像の白抜けの原因となる。その
ため、現像スリーブのカバーに磁石部材を設けたり、特
開昭60−146276号公報に開示されているよう
に、磁石体に、現像剤規制部材と該磁石体の現像磁極の
間に互いに反ぱつし合う同極磁極部(反ぱつ磁極)を設
けることが提案されている。In this type of developing device, the developer regulating member is often clogged due to developer clumps (aggregates), paper dust, etc., and the developer is not conveyed to the downstream side of the developer regulating member. It causes the white spots on the. Therefore, a magnet member is provided on the cover of the developing sleeve, or, as disclosed in Japanese Patent Laid-Open No. 146276/1985, the magnet body is reciprocated between the developer regulating member and the developing magnetic pole of the magnet body. It has been proposed to provide homopolar magnetic pole portions (reciprocal magnetic poles) that are matched with each other.
【0004】前者の場合は、現像スリーブ内の磁石とス
リーブカバー間に磁気ブラシが形成され、現像剤が若干
溜まり、この溜まりにより白抜け部に現像剤を供給し、
白抜けを防止するものである。。後者現像装置(特開昭
60−146276号)は、磁石体の反撥磁極部におけ
る現像剤の攪乱、飛翔により現像剤層厚の不均一性を是
正し、また、規制部材に目詰まりが生じたときでも、こ
の現像剤攪乱、飛翔により現像剤抜けを埋めて画像の白
抜けを防止しようとするものである。In the former case, a magnetic brush is formed between the magnet in the developing sleeve and the sleeve cover, and the developer is slightly accumulated, and the developer is supplied to the blank area by the accumulation.
This is to prevent blank areas. . The latter developing device (Japanese Patent Laid-Open No. 60-146276) corrects the non-uniformity of the developer layer thickness due to the disturbance and flying of the developer in the repellent magnetic pole portion of the magnet body, and also causes the clogging of the regulating member. Even at this time, it is intended to prevent the blank portion of the image by filling the blank portion of the developer due to the disturbance and the flying of the developer.
【0005】[0005]
【発明が解決しようとする課題】しかし、磁石部材を用
いる場合、現像スリーブと磁石部材との距離設定が難し
く、近すぎると、現像剤搬送量が減少し、遠すぎると、
磁石部材の効果がない。また、後者の現像装置による
と、一般に磁石体は、磁極数、極配置、磁力が微妙なバ
ランスを保たなければならないので、前記同極着磁部の
位置、該着磁部における同極相互の配置関係等が制約さ
れ、非常に設計が困難である。特に小径の現像スリーブ
に対し使用される小型の磁石体には適用し難い。However, when a magnet member is used, it is difficult to set the distance between the developing sleeve and the magnet member. If the distance is too short, the developer conveyance amount decreases, and if it is too far,
There is no effect of the magnet member. Further, according to the latter developing device, in general, the magnet body must maintain a delicate balance of the number of magnetic poles, the arrangement of poles, and the magnetic force. It is very difficult to design because the layout relationship of is restricted. Especially, it is difficult to apply to a small magnet body used for a developing sleeve having a small diameter.
【0006】そこで本発明は、磁石体と、前記磁石体の
周囲を回転する現像スリーブと、前記現像スリーブに臨
む現像剤規制部材とを有し、前記現像スリーブに供給さ
れる現像剤を前記規制部材で搬送量を規制しつつ前記磁
石体の磁力に基づいて前記現像スリーブ外周面に保持し
て現像領域へ搬送する現像装置であって、現像剤凝集物
や紙粉等による現像剤規制部材の目詰まりがたとえ生じ
ても、画像の白抜けを防止できるうえ、磁石体の設計が
容易な現像装置を提供することを目的とする。Therefore, the present invention has a magnet body, a developing sleeve that rotates around the magnet body, and a developer regulating member that faces the developing sleeve, and regulates the developer supplied to the developing sleeve. A developing device that holds the outer peripheral surface of the developing sleeve based on the magnetic force of the magnet body and conveys it to a developing area while regulating the amount of conveyance by a member, which is a developer regulating member such as a developer agglomerate or paper dust. An object of the present invention is to provide a developing device capable of preventing white spots in an image even if clogging occurs and having a magnet body designed easily.
【0007】[0007]
【課題を解決するための手段】本発明者は前記目的を達
成すべく研究を重ねたところ、特開昭60−14627
6号公報に開示されている現像剤規制部材下流側の同極
磁極(反ぱつ磁極)の配置に代えて、互いに逆極性の磁
極を配置し、且つ、これら磁極のうち上流側磁極の垂直
磁界をこれら磁極間の水平磁界より十分大きくなるよう
にすれば、該上流側磁極に蓄えられた現像剤がこの磁極
よりさらに上流側の逆極性磁極に強く引かれて逆流しよ
うとし、あたかも従来の同極磁極配置と同様の現像が起
こり、規制部材に発生する現像剤抜けがこのときの攪乱
作用で埋められること、及び従来の同極着磁部が不要に
なるので磁石体の設計が容易になることを見出し、本発
明を完成した。The inventor of the present invention has conducted extensive research to achieve the above-mentioned object, and found that the method disclosed in JP-A-60-14627.
Instead of the arrangement of the homopolar magnetic poles (reverse magnetic poles) on the downstream side of the developer regulating member disclosed in Japanese Patent Laid-Open No. 6, the magnetic poles of opposite polarities are arranged, and the vertical magnetic field of the upstream magnetic pole among these magnetic poles. Is set to be sufficiently larger than the horizontal magnetic field between these magnetic poles, the developer stored in the upstream magnetic pole is strongly attracted to the reverse polarity magnetic pole on the upstream side of this magnetic pole and tries to flow backward, as if the conventional magnetic field were the same. Development similar to the pole pole arrangement occurs, the developer omission occurring in the regulating member is filled by the disturbing action at this time, and the conventional homopolar magnetized portion becomes unnecessary, so that the design of the magnet body is facilitated. It was found that the present invention has been completed.
【0008】すなわち本発明は、磁石体と、前記磁石体
の周囲を回転する現像スリーブと、前記現像スリーブに
臨む現像剤規制部材とを有し、前記現像スリーブに供給
される現像剤を前記規制部材で搬送量を規制しつつ前記
磁石体の磁力に基づいて前記現像スリーブ外周面に保持
して現像領域へ搬送する現像装置において、前記磁石体
が、前記規制部材を境にして前記現像スリーブの回転方
向において上流側と下流側に互いに逆極性の磁極を有す
るとともに、前記上流側磁極に隣るさらに上流側にそれ
と同極性の磁極を、前記下流側磁極に隣るさらに下流側
にそれと逆極性の磁極をそれぞれ有しており、前記規制
部材より下流側にある互いに逆極性の前記両磁極のう
ち、上流側磁極の垂直磁界の最大値Aガウスと該両磁極
間の水平磁界の最大値BガウスとがA/2>Bの関係に
あることを特徴とする現像装置を提供するものである。That is, the present invention has a magnet body, a developing sleeve that rotates around the magnet body, and a developer regulating member that faces the developing sleeve, and regulates the developer supplied to the developing sleeve. In a developing device in which the amount of conveyance is regulated by a member and is held on the outer peripheral surface of the developing sleeve based on the magnetic force of the magnet body and conveyed to the developing area, the magnet body is a boundary of the regulating member. The magnetic poles having opposite polarities are provided on the upstream side and the downstream side in the rotation direction, and the magnetic pole having the same polarity is provided on the upstream side adjacent to the upstream magnetic pole and the opposite polarity is provided on the further downstream side adjacent to the downstream magnetic pole. Of the opposite magnetic poles on the downstream side of the restricting member, the maximum value A of the vertical magnetic field of the upstream magnetic pole and the maximum of the horizontal magnetic field between the two magnetic poles. B Gauss and is intended to provide a developing device, characterized in that a relationship of A / 2> B.
【0009】前記規制部材に隣る下流側の互いに逆極性
の両磁極間の磁気力を弱めるために、それらの近傍、例
えばスリーブカバーに磁性体を配置したり、また、それ
ら両磁極のうち下流側磁極のさらに下流側に、それとは
逆極性の同極着磁部を設けてもよい。In order to weaken the magnetic force between the two magnetic poles of opposite polarities on the downstream side adjacent to the regulating member, a magnetic material is arranged in the vicinity of them, for example, a sleeve cover, or the downstream side of both magnetic poles. A homopolarized portion having the opposite polarity may be provided further downstream of the side magnetic pole.
【0010】[0010]
【作用】本発明現像装置によると、現像剤規制部材の上
流側に供給された現像剤は、現像スリーブの回転に伴
い、該規制部材の上流側磁極からこれとは逆極性の規制
部材下流側の磁極へ磁力にて搬送されるが、該下流側磁
極とさらにその下流側の逆極性の磁極の間の水平磁界が
弱いため、前記規制部材より上流側の磁極へ逆流しよう
とし、規制部材に隣る下流側磁極で保持し切れなくなっ
た磁極はそれに隣る下流の磁極へ飛翔する如く搬送さ
れ、最終的には現像領域へ供給される。According to the developing device of the present invention, the developer supplied to the upstream side of the developer restricting member moves from the upstream magnetic pole of the restricting member to the downstream side of the restricting member having the opposite polarity as the developing sleeve rotates. However, since the horizontal magnetic field between the downstream magnetic pole and the magnetic pole having the opposite polarity on the downstream side is weak, the magnetic flux is conveyed to the magnetic pole on the upstream side from the regulating member, and the magnetic field is transferred to the regulating member. The magnetic pole that cannot be held by the adjacent downstream magnetic pole is transported so as to fly to the adjacent downstream magnetic pole, and finally supplied to the developing area.
【0011】現像剤が主として前記規制部材より上流側
の磁極へ逆流しようとする現象により攪乱作用を受ける
ことにより、また、前記飛翔又は飛翔状搬送により、現
像剤の凝集物や紙粉等による規制部材の目詰まりに起因
して発生しようとする現像剤抜けが埋められる。When the developer is disturbed mainly by the phenomenon that the developer tries to flow back to the magnetic pole on the upstream side of the regulating member, and by the flight or flight-like conveyance, the developer is regulated by agglomerates or paper dust. The developer omission that may occur due to the clogging of the member is filled.
【0012】[0012]
【実施例】以下、本発明の実施例を図面を参照して説明
する。図1は1実施例の断面を示している。図2は磁石
ロールの垂直及び水平磁界分布を示している。この現像
装置は、ケーシング1を備えており、該ケーシングの一
側には画像形成装置の静電潜像担持体である感光体ドラ
ムPCに臨む開口11が設けられている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a cross section of one embodiment. FIG. 2 shows the vertical and horizontal magnetic field distribution of the magnet roll. This developing device includes a casing 1, and an opening 11 facing the photosensitive drum PC which is an electrostatic latent image carrier of the image forming apparatus is provided on one side of the casing 1.
【0013】ケーシング1の前記開口11を含む部分に
は現像スリーブ2が回転可能に収容支持されており、該
スリーブの一部はケーシング開口11から感光体ドラム
PCに臨んでいる。現像スリーブ2内には固定磁石ロー
ル3が配置されている。現像スリーブ2の上面にはケー
シング1に支持された現像剤規制部材である穂高規制部
材4が臨んでおり、現像スリーブ2の背後にはバケット
ローラ5が回転可能に収容支持されている。A developing sleeve 2 is rotatably accommodated and supported in a portion including the opening 11 of the casing 1, and a part of the sleeve faces the photosensitive drum PC through the casing opening 11. A fixed magnet roll 3 is arranged in the developing sleeve 2. A brush height regulating member 4 which is a developer regulating member supported by the casing 1 faces the upper surface of the developing sleeve 2, and a bucket roller 5 is rotatably accommodated and supported behind the developing sleeve 2.
【0014】スリーブ2及びバケットローラ5は図示し
ない駆動手段により図1中時計方向aに回転駆動され
る。バケットローラ5の上方にはトナーホッパ6が配置
され、ケーシング1に支持されている。トナーホッパ6
の下端開口には図示しない駆動手段により回転駆動され
るトナー補給ローラ61が配置されている。The sleeve 2 and the bucket roller 5 are rotationally driven in the clockwise direction a in FIG. 1 by a driving means (not shown). A toner hopper 6 is arranged above the bucket roller 5 and supported by the casing 1. Toner hopper 6
A toner replenishing roller 61, which is rotatably driven by a driving unit (not shown), is disposed at the lower end opening of the.
【0015】ケーシング1には磁性キャリアとトナーを
含む2成分現像剤7が収容されており、トナーホッパ6
には補給用のトナーTが収容されている。前記磁石ロー
ル3は磁極N1、S1、N2、N3、S2、N4、S
3、S4をこの順序で備えている。バケットローラ5か
ら現像剤を受け取る磁極S4はスリーブ2の回転方向a
において、規制部材4の上流側に配置され、互いに逆極
性の磁極N1、S1はこの順序で規制部材4の下流側に
配置されている。磁極N2、N3は現像領域Dに配置さ
れている。磁極S4に隣る上流側に配置されたこれと同
極性の磁極S3は、磁極S4の磁力線の磁極N1との結
びつきを強めて磁極N1、S1間の磁気力を弱める働き
をするとともに、スリーブ2から現像剤7を分離させる
分離磁極としても作用する。同様に磁極N3も、磁極N
2の磁力線の磁極S1との結びつきを強め、磁極N1、
S1間の磁気力を一層弱めている。The casing 1 contains a two-component developer 7 containing a magnetic carrier and toner, and a toner hopper 6
Contains a replenishment toner T. The magnet roll 3 has magnetic poles N1, S1, N2, N3, S2, N4 and S.
3 and S4 are provided in this order. The magnetic pole S4 that receives the developer from the bucket roller 5 is in the rotation direction a of the sleeve 2.
In, the magnetic poles N1 and S1 that are arranged on the upstream side of the regulating member 4 and have opposite polarities are arranged on the downstream side of the regulating member 4 in this order. The magnetic poles N2 and N3 are arranged in the developing area D. The magnetic pole S3 having the same polarity, which is arranged on the upstream side adjacent to the magnetic pole S4, has a function of strengthening the connection between the magnetic force line of the magnetic pole S4 and the magnetic pole N1 and weakening the magnetic force between the magnetic poles N1 and S1, and the sleeve 2 Also acts as a separating magnetic pole for separating the developer 7 from the. Similarly, the magnetic pole N3 is also the magnetic pole N
By strengthening the connection between the magnetic field line 2 and the magnetic pole S1, the magnetic pole N1,
The magnetic force between S1 is further weakened.
【0016】この磁石ロール3における垂直磁界及び水
平磁界の分布は図2に示すとおりである。この図におい
て、実線は垂直磁界分布を、破線は水平磁界分布を
示しており、矢印Xは穂高規制部材4の位置を示してい
る。この図から分かるように、規制部材4に隣る下流側
の異極N1、S1間の水平磁界の最大値Bガウスは、磁
極S3の作用で磁極S4の磁力線が磁極N1と強く結び
つき、磁極N1、S1間の磁気力がそれだけ弱まってい
る結果、磁極N1の垂直磁界の最大値Aガウスの2分の
1より小さくなっている。The distribution of the vertical magnetic field and the horizontal magnetic field in the magnet roll 3 is as shown in FIG. In this figure, the solid line indicates the vertical magnetic field distribution, the broken line indicates the horizontal magnetic field distribution, and the arrow X indicates the position of the spike height regulating member 4. As can be seen from this figure, the maximum value B Gauss of the horizontal magnetic field between the different poles N1 and S1 on the downstream side adjacent to the regulating member 4 is that the magnetic field lines of the magnetic pole S4 are strongly connected to the magnetic pole N1 by the action of the magnetic pole S3. , S1 is weakened by that much, so that it is smaller than one half of the maximum value A Gauss of the vertical magnetic field of the magnetic pole N1.
【0017】また、前記水平磁界の最大値Bガウスは、
磁極N3の作用で磁極N2の磁力線が磁極S1と強く結
びついているため、一層小さくなっている。なお、同極
磁極N2、N3はN1−S1間の磁気力を一層弱めるた
めに設けてあるが、必ずしも必要ではない。一つのN極
でもよい。この現像装置によると、図示しない駆動手段
により現像スリーブ2及びバケットローラ5が図1中時
計方向aに回転駆動され、それによって現像剤7がバケ
ットローラ5で攪拌されつつ現像スリーブ2上へ供給さ
れる。The maximum value B Gauss of the horizontal magnetic field is
The magnetic field lines of the magnetic pole N2 are strongly connected to the magnetic pole S1 by the action of the magnetic pole N3, and thus are further reduced. The homopolar magnetic poles N2 and N3 are provided in order to further weaken the magnetic force between N1 and S1, but they are not always necessary. One N pole may be used. According to this developing device, the developing sleeve 2 and the bucket roller 5 are rotationally driven in the clockwise direction a in FIG. 1 by a driving unit (not shown), whereby the developer 7 is supplied onto the developing sleeve 2 while being agitated by the bucket roller 5. It
【0018】スリーブ2へ供給された現像剤は固定磁石
ロール3の磁力により現像剤の穂(磁気ブラシ)の形で
保持され、該スリーブの回転にともなって現像領域Dへ
搬送される。この搬送途中で搬送量が規制部材4により
規制される。規制部材を通過した現像剤は、N1極へ搬
送されるが、図3に示すように、N1極の磁気力に比べ
磁極N1−S1間の磁気力が弱いため、磁極N1上の現
像剤7は磁力線Yに沿って磁気的にスリーブ2の回転方
向aにおいて上流側へ引かれ、逆流しようとする。その
結果、図3中、○で囲った磁極N1上で現像剤が強く攪
乱され、規制部材4における現像剤や紙粉等による目詰
まりによる現像剤抜けが十分埋められ、それだけ画像の
白抜けが確実に防止されるとともに、トナー荷電の立ち
上がりも良くなる。The developer supplied to the sleeve 2 is held in the form of a brush (magnetic brush) of the developer by the magnetic force of the fixed magnet roll 3, and is conveyed to the developing area D as the sleeve rotates. During this transportation, the transportation amount is regulated by the regulation member 4. The developer that has passed through the regulation member is conveyed to the N1 pole, but as shown in FIG. 3, the magnetic force between the magnetic poles N1 and S1 is weaker than the magnetic force of the N1 pole. Is magnetically attracted to the upstream side in the rotation direction a of the sleeve 2 along the line of magnetic force Y, and tries to flow backward. As a result, in FIG. 3, the developer is strongly disturbed on the magnetic pole N1 circled, and the developer omission due to the clogging by the developer or paper dust in the regulation member 4 is sufficiently filled, and the white spots in the image are correspondingly reduced. In addition to being surely prevented, the rising of the toner charge is improved.
【0019】磁極N1で保持しきれなくなった現像剤7
は磁極S1へ搬送され、最終的に現像領域へ供給されて
現像に供されたのち、余ったものは、スリーブ2の回転
により分離磁極S3へ搬送され、ここでスリーブ2から
分離して、バケットローラ5へ流れ込む。磁極N1から
S1への現像剤移動は、磁極N1−S1間に比べ磁極S
1の磁気力が強いときは、N1−S1間で飛翔する。完
全に飛翔しないときでも、飛翔気味に移動する。したが
ってこの飛翔又は飛翔状の移動によっても、現像剤抜け
は一層確実に埋められ、画像の白抜けが防止される。Developer 7 that can no longer be held by the magnetic pole N1
Is conveyed to the magnetic pole S1 and finally supplied to the developing area for development, and the excess is conveyed to the separating magnetic pole S3 by the rotation of the sleeve 2, where it is separated from the sleeve 2 and the bucket It flows into the roller 5. The movement of the developer from the magnetic pole N1 to S1 is greater than that between the magnetic poles N1 and S1.
When the magnetic force of 1 is strong, it flies between N1 and S1. Even if it doesn't fly completely, it moves like a flight. Therefore, the developer dropout is more surely filled even by the flight or the flight-like movement, and the whiteout of the image is prevented.
【0020】なお、ケーシング1内の現像剤のトナー濃
度が低下すると、トナーホッパ6からトナー補給ローラ
61の回転によりトナーTが補給される。ここで、図1
の現像装置を図示しないプリンタに組み込んで使用し、
且つ、現像スリーブ2の表面粗Rzを5〜10S、外径
を24.5mm、周速を20cm/Sとし、現像剤のキ
ャリアにバインダタイプのものを採用し、N1極の最大
垂直磁力Aガウス、N1−S1間の最大水平磁力Bガウ
ス、S1極の最大垂直磁力Cガウスを種々変化させて、
画像白抜け防止効果を調べたところ、表1の結果を得
た。磁力の測定は電子磁気工業社製のGM−102によ
る。×印は効果なし、○印は効果有りを示している。When the toner concentration of the developer in the casing 1 decreases, the toner T is replenished from the toner hopper 6 by the rotation of the toner replenishing roller 61. Here, FIG.
Using the developing device of No. 1 by incorporating it in a printer not shown,
Moreover, the surface roughness Rz of the developing sleeve 2 is 5 to 10 S, the outer diameter is 24.5 mm, the peripheral speed is 20 cm / S, and the binder type developer carrier is adopted. , N1-S1 maximum horizontal magnetic force B Gauss and S1 pole maximum vertical magnetic force C Gauss are variously changed,
When the effect of preventing image white spots was examined, the results shown in Table 1 were obtained. The magnetic force is measured by GM-102 manufactured by Denshi Kogaku Kogyo. The mark x indicates no effect, and the mark o indicates effect.
【0021】表1から分かるように、A/2>Bの関係
が望ましいことが分かる。また、S1極の垂直磁力を大
きくしてN1−S1間で現像剤を飛翔させることが好ま
しいと言える。As can be seen from Table 1, the relationship of A / 2> B is desirable. Further, it can be said that it is preferable to increase the perpendicular magnetic force of the S1 pole to fly the developer between N1 and S1.
【0022】[0022]
【表1】 前記実施例によれば、従来装置で採用されていた現像剤
攪乱、飛翔用の同極着磁部が不要であるから、それだけ
磁石ロールの設計が、たとえ小型のものでも容易であ
る。なお、本発明は前記実施例に限定されるものではな
く、他の態様でも実施できる。例えば図4に示すうよう
に、磁極N1、S1の近傍でケーシング1に磁性体8を
設けることで、N1−S1間の水平磁力を弱めるように
してもよい。[Table 1] According to the above-mentioned embodiment, since the magnetizing portion for developer disturbing and flying, which is used in the conventional apparatus, is unnecessary, the magnet roll can be designed so much even if it is small. It should be noted that the present invention is not limited to the above embodiment, and can be implemented in other modes. For example, as shown in FIG. 4, the horizontal magnetic force between N1 and S1 may be weakened by providing the casing 1 with the magnetic body 8 in the vicinity of the magnetic poles N1 and S1.
【0023】[0023]
【発明の効果】本発明によると、磁石体と、前記磁石体
の周囲を回転する現像スリーブと、前記現像スリーブに
臨む現像剤規制部材とを有し、前記現像スリーブに供給
される現像剤を前記規制部材で搬送量を規制しつつ前記
磁石体の磁力に基づいて前記現像スリーブ外周面に保持
して現像領域へ搬送する現像装置であって、現像剤凝集
物や紙粉等による現像剤規制部材の目詰まりがたとえ生
じても、画像の白抜けを防止できるうえ、磁石体の設計
も容易な現像装置を提供することができる。According to the present invention, the developer supplied to the developing sleeve has a magnet body, a developing sleeve rotating around the magnet body, and a developer regulating member facing the developing sleeve. A developing device that holds the outer peripheral surface of the developing sleeve and conveys it to a developing area based on the magnetic force of the magnet body while regulating the conveying amount by the regulating member, and regulates the developer by a developer aggregate, paper dust, or the like. Even if the member is clogged, it is possible to provide a developing device that can prevent white spots in an image and also can easily design a magnet body.
【図1】本発明の一実施例の概略断面図である。FIG. 1 is a schematic sectional view of an embodiment of the present invention.
【図2】磁石ロールの垂直及び水平磁界分布図である。FIG. 2 is a vertical and horizontal magnetic field distribution map of a magnet roll.
【図3】現像剤の攪乱、飛翔の説明図である。FIG. 3 is an explanatory diagram of disturbance and flying of a developer.
【図4】本発明の他の実施例の一部断面図である。FIG. 4 is a partial cross-sectional view of another embodiment of the present invention.
1 ケーシング 2 現像スリーブ 3 磁石ロール 4 穂高規制部材 N1、S1、N2、N3、S2、N4、S3、S4 磁
極DESCRIPTION OF SYMBOLS 1 casing 2 developing sleeve 3 magnet roll 4 spike height regulating member N1, S1, N2, N3, S2, N4, S3, S4 magnetic pole
───────────────────────────────────────────────────── フロントページの続き (72)発明者 松浦 昌彦 大阪市中央区安土町二丁目3番13号 大阪 国際ビルミノルタカメラ株式会社内 (72)発明者 三河 進 大阪市中央区安土町二丁目3番13号 大阪 国際ビルミノルタカメラ株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiko Matsuura 2-3-13 Azuchi-cho, Chuo-ku, Osaka Within Osaka Kokusai Building Minolta Camera Co., Ltd. (72) Inventor Susumu Mikawa 2-chome, Azuchi-cho, Chuo-ku, Osaka No. 13 Osaka International Building Minolta Camera Co., Ltd.
Claims (1)
現像スリーブと、前記現像スリーブに臨む現像剤規制部
材とを有し、前記現像スリーブに供給される現像剤を前
記規制部材で搬送量を規制しつつ前記磁石体の磁力に基
づいて前記現像スリーブ外周面に保持して現像領域へ搬
送する現像装置において、前記磁石体が、前記規制部材
を境にして前記現像スリーブの回転方向において上流側
と下流側に互いに逆極性の磁極を有するとともに、前記
上流側磁極に隣るさらに上流側にそれと同極性の磁極
を、前記下流側磁極に隣るさらに下流側にそれと逆極性
の磁極をそれぞれ有しており、前記規制部材より下流側
にある互いに逆極性の前記両磁極のうち、上流側磁極の
垂直磁界の最大値Aガウスと該両磁極間の水平磁界の最
大値BガウスとがA/2>Bの関係にあることを特徴と
する現像装置。Claims: 1. A developer having a magnet body, a developing sleeve rotating around the magnet body, and a developer regulating member facing the developing sleeve, the developer being supplied to the developing sleeve. In a developing device that holds the transfer amount by the restricting member and holds it on the outer peripheral surface of the developing sleeve based on the magnetic force of the magnet body and transfers it to the developing area. In the rotation direction of the developing sleeve, magnetic poles having opposite polarities are provided on the upstream side and the downstream side, and a magnetic pole having the same polarity is provided on the upstream side adjacent to the upstream magnetic pole and on the downstream side adjacent to the downstream magnetic pole. Of the two magnetic poles having opposite polarities opposite to each other and having the opposite polarities, the maximum value A Gauss of the vertical magnetic field of the upstream magnetic pole and the horizontal magnetic field between the magnetic poles are provided. Most A developing device and a value B Gauss is characterized in that it is in the relation of A / 2> B.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15347791A JPH052340A (en) | 1991-06-25 | 1991-06-25 | Developing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15347791A JPH052340A (en) | 1991-06-25 | 1991-06-25 | Developing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH052340A true JPH052340A (en) | 1993-01-08 |
Family
ID=15563432
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15347791A Withdrawn JPH052340A (en) | 1991-06-25 | 1991-06-25 | Developing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH052340A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009057317A (en) * | 2007-08-31 | 2009-03-19 | Kyoyu Agri Kk | Pest control agent |
-
1991
- 1991-06-25 JP JP15347791A patent/JPH052340A/en not_active Withdrawn
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009057317A (en) * | 2007-08-31 | 2009-03-19 | Kyoyu Agri Kk | Pest control agent |
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Legal Events
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---|---|---|---|
A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19980903 |