JPH02262171A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPH02262171A JPH02262171A JP1082849A JP8284989A JPH02262171A JP H02262171 A JPH02262171 A JP H02262171A JP 1082849 A JP1082849 A JP 1082849A JP 8284989 A JP8284989 A JP 8284989A JP H02262171 A JPH02262171 A JP H02262171A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- magnetic
- developing device
- developing sleeve
- carrier
- 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.)
- Granted
Links
- 230000005291 magnetic effect Effects 0.000 claims abstract description 73
- 239000006249 magnetic particle Substances 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims 1
- 239000012141 concentrate Substances 0.000 abstract description 2
- 230000001112 coagulating effect Effects 0.000 abstract 1
- 230000006866 deterioration Effects 0.000 abstract 1
- 238000007789 sealing Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 241000519995 Stachys sylvatica Species 0.000 description 1
- 229920006311 Urethane elastomer Polymers 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 210000002105 tongue Anatomy 0.000 description 1
Landscapes
- Magnetic Brush Developing In Electrophotography (AREA)
- Dry Development In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、像担持体上に電子写真方式或いは静電記録方
式により形成された静電潜像を現像するための現像装置
に関するものであり、特に磁性トナーから成るｌ成分現
像剤或いは磁性キャリア及びトナーを有する２成分現像
剤を使用した現像装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a developing device for developing an electrostatic latent image formed on an image carrier by an electrophotographic method or an electrostatic recording method. The present invention relates to a developing device using a component developer or a two-component developer having a magnetic carrier and a toner.
【え立且遣
従来、上記１成分現像剤或いは２成分現像剤を使用し、
像担持体上に電子写真方式或いは静電記録方式により形
成された静電潜像を現像するための現像装置は種々の構
成のものが提案されているが、その代表的な現像装置が
第５図に示される。[Conventionally, the above-mentioned one-component developer or two-component developer was used,
Various configurations of developing devices have been proposed for developing an electrostatic latent image formed on an image carrier by an electrophotographic method or an electrostatic recording method, and a typical developing device is the fifth developing device. As shown in the figure.
本例では、カラー画像形成装置に使用される回転式現像
手段において、像担持体と対面した現像位置に回転移送
された一つの現像装置を示している。In this example, in a rotary developing means used in a color image forming apparatus, one developing device is shown which is rotationally transferred to a developing position facing an image carrier.
現像装置ｌは現像容器２を備え、該現像容器２内にはス
クリュー４及び６が配設される。該スクリュー４．６に
より現像剤８は現像容器２内で往復循環される。The developing device 1 includes a developing container 2, and screws 4 and 6 are disposed within the developing container 2. The developer 8 is reciprocated within the developer container 2 by the screw 4.6.
又、現像装置１は、像担持体１００上に形成された静電
潜像を現像するために、現像容器内の現像剤８を像担持
体１００の方へと搬送するために現像剤担持体１０を有
する。通常、現像剤担持体１０は、図示されるように磁
化された固定の磁石ローラ１０ａと、該磁石ローラｌＯ
ａの周囲に図示矢印方向に回転自在に取付けられ、現像
剤を像担持体１００の方へと搬送する現像スリーブ１０
ｂとから構成される。現像スリーブｌＯｂは、その軸１
０ｃが第６図に図示されるように、現像容器２の両側壁
２ａ（第６図には片側の側壁２ａのみが図示される）に
軸受１２を介して支持されている。The developing device 1 also includes a developer carrier for conveying the developer 8 in the developer container toward the image carrier 100 in order to develop the electrostatic latent image formed on the image carrier 100. It has 10. Typically, the developer carrier 10 includes a magnetized fixed magnet roller 10a as shown in the figure, and the magnet roller lO.
a developing sleeve 10 that is rotatably mounted around a in the direction of the arrow in the figure and conveys the developer toward the image carrier 100;
It consists of b. The developing sleeve lOb has its axis 1
0c is supported by both side walls 2a of the developer container 2 (only one side wall 2a is shown in FIG. 6) via bearings 12, as shown in FIG.
斯る構成により、現像スリーブｌＯｂの回転によりＮＺ
極でくみ上げられた現像剤８はＳｚ極→Ｎ１極→Ｓ＋極
と搬送され、規制ブレード３０により規制され、現像剤
薄層が形成される。Ｓ１極は現像主極であり、ここで穂
立ちした現像剤が像担持体ｌＯＯ上の静電潜像を現像し
、その後Ｎ３極、ＮＺ極の反発磁界により現像スリーブ
１０ｂ上の現像剤は現像容器２内へ落下する。With this configuration, the rotation of the developing sleeve lOb causes the NZ
The developer 8 pumped up at the pole is transported in the order of Sz pole → N1 pole → S+ pole, and is regulated by the regulating blade 30 to form a thin layer of developer. The S1 pole is the main developing pole, and the developer that stands up here develops the electrostatic latent image on the image carrier lOO, and then the developer on the developing sleeve 10b develops due to the repulsive magnetic fields of the N3 and NZ poles. It falls into container 2.
又、このような構成の現像装置においては、現像容器２
内を上述のように循環移動される現像剤８が現像スリー
ブｌＯｂの表面に沿って前記軸受１２部へと移送され、
該軸受部を介して外部へと漏出したり、或いは軸受内に
留まって軸受の機能を減少させ、それによって現像スリ
ーブ１０ｂの円滑な回転が阻害されるのを防止するため
に、第６図及び第７図に図示するように、現像スリーブ
１０ｂの両端部周面には弾性体、不織布などの端部シー
ル部材１４とか、現像スリーブ１０ｂとの確実な接触を
保証する弾性接触舌片１６ａが形成された端部シール部
材１６とかが設けられ、現像スリーブ周面と現像容器側
壁２ａとの空隙部を閉鎖する手段が講じられている。Further, in the developing device having such a configuration, the developing container 2
The developer 8 circulated therein as described above is transferred to the bearing 12 portion along the surface of the developing sleeve lOb,
In order to prevent leakage to the outside through the bearing portion or remaining in the bearing and reducing the function of the bearing, thereby inhibiting the smooth rotation of the developing sleeve 10b, the steps shown in FIGS. As shown in FIG. 7, end seal members 14 made of an elastic material, nonwoven fabric, etc., and elastic contact tongues 16a that ensure reliable contact with the developing sleeve 10b are formed on the circumferential surface of both ends of the developing sleeve 10b. An end sealing member 16 is provided to close the gap between the developing sleeve circumferential surface and the developer container side wall 2a.
が しようと る
しかしながら、このような従来の構成では、端部シール
部材１４．１６と現像スリーブｆｏｂの周面との間には
わずかではあるが現像剤が進入する。そのため、現像装
置を長期間使用した場合にはこの現像剤が端部シール部
材１４．１６の間で融着や凝集を起こす。However, in such a conventional configuration, a small amount of developer enters between the end seal member 14.16 and the circumferential surface of the developing sleeve fob. Therefore, when the developing device is used for a long period of time, this developer causes fusion and aggregation between the end seal members 14 and 16.
この凝集体の一部は現像剤に取り込まれてしまうが、凝
集体が大きい場合には規制ブレード３０部分につかまり
、現像剤が現像スリーブｌＯｂ上にコートされない部分
ができ、これによって画像上白スジが発生することがあ
る。A part of this aggregate is taken into the developer, but if the aggregate is large, it will be caught by the regulation blade 30, creating a portion where the developer is not coated on the developing sleeve lOb, resulting in white streaks on the image. may occur.
又、凝集体が小さい場合には現像剤と一緒に現像され、
特にベタ画像の場合に、現像された凝集体を中心に転写
抜けを生じ、画像上に白斑点状の欠陥が生じ、画質を著
しく低下させてしまう。これを防ぐ目的で端部シール部
材の密着性を大とすると、現像スリーブに極めて大きな
ストレスが加わり、現像スリーブ駆動モータの負荷が増
大することとなり、又長期にわたって完全に現像剤の進
入を防ぐことは困難であった。Also, if the aggregate is small, it will be developed together with the developer,
Particularly in the case of a solid image, transfer defects occur mainly in the developed aggregates, causing defects in the form of white spots on the image, which significantly deteriorates the image quality. If the adhesion of the end seal member is increased in order to prevent this, extremely large stress will be applied to the developing sleeve, increasing the load on the developing sleeve drive motor, and it will also be necessary to completely prevent developer from entering over a long period of time. was difficult.
従って、本発明の目的は、現像剤がシール部材と、現像
スリーブの如き現像剤担持体とによりストレスを受は凝
集体を作ったり、更には融着を起すことを完全に防止す
ることができ、又、従来のように凝集体の発生防止を目
的として端部シール部材の密着性を増大させる必要がな
い、つまり現像剤担持体の駆動負荷が増えるような弊害
を生じない現像装置を提供することである。Therefore, an object of the present invention is to completely prevent the formation of aggregates or even fusion when the developer is subjected to stress by the sealing member and the developer carrier such as the developing sleeve. Further, it is an object of the present invention to provide a developing device that does not require increasing the adhesion of an end sealing member for the purpose of preventing the generation of aggregates as in the past, that is, does not cause problems such as an increase in the driving load of a developer carrier. That's true.
るための
ヒ記目的は本発明に係る現像装置にて達成される。要約
すれば本発明は、磁性粒子を含んだ現像剤を収容した現
像容器と、前記現像容器に回動自在に担持され、そして
内部に磁石を有することにより表面に現像剤を担持し搬
送する現像剤担持体とを有する現像装置において、前記
現像剤担持体の両端部には、該現像剤担持体の表面と所
定の空隙をもって該現像剤担持体の少なくとも一部の周
面に沿って磁性部材を配置し、該磁性部材と、該現像剤
担持体内部に配置された磁石とにより磁性部材の現像剤
担持体側の面に磁力線が集中するように磁気回路を形成
せしめて該空隙部に磁力線に沿って現像剤による磁気ブ
ラシを形成し、該磁気ブラシによって現像剤の外部への
漏出をシールすることを特徴とする現像装置である。The above objects are achieved by the developing device according to the present invention. In summary, the present invention provides a developer container containing a developer containing magnetic particles, and a developer rotatably carried by the developer container and having a magnet inside to carry and transport the developer on its surface. In a developing device having a developer carrier, a magnetic member is provided at both ends of the developer carrier along the circumferential surface of at least a portion of the developer carrier with a predetermined gap between the surface of the developer carrier and a predetermined gap. The magnetic member and the magnet disposed inside the developer carrier form a magnetic circuit so that the lines of magnetic force are concentrated on the surface of the magnetic member on the developer carrier side, and the lines of magnetic force are applied to the gap. This developing device is characterized in that a magnetic brush of developer is formed along the surface of the developing device, and the leakage of the developer to the outside is sealed by the magnetic brush.
好ましくは、磁性部材に隣接して、弾性体シト或いは磁
石のような補助シール部材が配置される。Preferably, an auxiliary seal member such as an elastic sheet or a magnet is disposed adjacent to the magnetic member.
実」１倒
次に、本発明に係る現像装置を図面に即して更に詳しく
説明する。1. Next, the developing device according to the present invention will be explained in more detail with reference to the drawings.
第１図に図示される本実施例の現像装置１ａは、第５図
に関連して説明したと同様に、カラ画像形成装置用の回
転式現像手段に使用される現像装置とされるが、本発明
はこれに限定されるものではない。The developing device 1a of this embodiment illustrated in FIG. 1 is a developing device used in a rotary developing means for a color image forming apparatus, as described in connection with FIG. The present invention is not limited to this.
本実施例にて現像装置１ａは現像剤（磁性粒子が樹脂に
混練された磁性トナー、即ちｌ成分磁性現像剤、又は磁
性粒子を主成分とする磁性キャリアとトナーが混合され
た２成分現像剤）を収容する現像容器２を備え、又、該
現像容器２内には現像剤を現像容器２内で往復循環する
ためのスクリュー４及び６が配設される。第１図には現
像剤は図示されていない。In this embodiment, the developing device 1a uses a developer (a magnetic toner in which magnetic particles are kneaded into a resin, i.e., an l-component magnetic developer, or a two-component developer in which a magnetic carrier whose main component is magnetic particles and a toner are mixed). ), and screws 4 and 6 for reciprocating the developer within the developer container 2 are disposed within the developer container 2. No developer is shown in FIG.
又、現像装置１は、像担持体１００上に形成された静電
潜像を現像するために、現像容器内の現像剤を像担持体
１００の方へと搬送するために現像剤担持体１０を有す
る０本実施例にて、現像剤担持体ｌＯは、磁化された固
定の磁石ローラ１０ａと、該磁石ローラｌｏａの周囲に
矢印方向に回転自在に取付けられ、現像剤を搬送する現
像スリーブｌＯｂとから構成される。The developing device 1 also includes a developer carrier 10 to convey the developer in the developer container toward the image carrier 100 in order to develop the electrostatic latent image formed on the image carrier 100. In this embodiment, the developer carrier lO includes a magnetized fixed magnet roller 10a, and a developing sleeve lOb that is rotatably attached around the magnet roller loa in the direction of the arrow and conveys the developer. It consists of
現像スリーブ１０ｂは、第２図に図示されるように、両
端に回転支持軸１０ｃ （第２図には片側の端部のみが
図示される）を有し、現像容器２の側壁２ａに軸受１２
を介して回転自在に支持される。As shown in FIG. 2, the developing sleeve 10b has rotation support shafts 10c at both ends (only one end is shown in FIG. 2), and a bearing 12 on the side wall 2a of the developer container 2.
It is rotatably supported via.
斯る構成により、従来と同様に、現像スリーブ１０ｂの
回転によりＮＺ極でくみ上げられた現像剤はＳｚ極→Ｎ
、極→Ｓ１極と搬送され、規制部材３０で規制され、現
像剤薄層を形成する。Ｓ極は現像主極であり、ここで穂
立ちした現像剤が像担持体１００上の静電潜像を現像し
、その後Ｎ３極、Ｎｚ極の反発磁界により現像スリーブ
１０ｂ上の現像剤は現像容器２内へ落下する。With this configuration, the developer pumped up at the NZ pole by the rotation of the developing sleeve 10b is transferred from the Sz pole to the N pole, as in the conventional case.
, pole→S1 pole, and is regulated by the regulating member 30 to form a thin developer layer. The S pole is the main development pole, and the developer that stands up here develops the electrostatic latent image on the image carrier 100, and then the developer on the development sleeve 10b is developed by the repulsive magnetic fields of the N3 and Nz poles. It falls into container 2.
本発明に従えば、現像スリーブ１０ｂの両端部において
、該現像スリーブｔａｂを囲包する態様にて板状磁性部
材２１が配置され、現像容器側壁２ａに取付けられる。According to the present invention, the plate-shaped magnetic members 21 are arranged at both ends of the developing sleeve 10b so as to surround the developing sleeve tab, and are attached to the side wall 2a of the developing container.
磁性部材２１は、厚さ（１）が０．２〜１ｍｍ程度の鉄
板、ニッケル板、コバルト板、又はそれらの合金製の板
の如き強磁性材料にて作製されるのが好ましい。これら
の材料は（１／２） （ＢＨ）ｍａｘが０．７Ｊ／
ゴ以下である。（ＢＨ）ｍａｘは、Ｂを残留磁束密度、
Ｈを保磁力として、ＢＸＨの最大値で、最大エネルギー
積を示す。現像スリーブ１０ｂ周面との間の空隙（ｇ）
は、限定されるものではないが、０．３〜２ｍｍの範囲
で適当に選択される。The magnetic member 21 is preferably made of a ferromagnetic material such as an iron plate, a nickel plate, a cobalt plate, or an alloy plate thereof having a thickness (1) of about 0.2 to 1 mm. These materials have (1/2) (BH)max of 0.7J/
Go below. (BH)max is B the residual magnetic flux density,
The maximum value of BXH indicates the maximum energy product, where H is the coercive force. Gap (g) between the developing sleeve 10b and the circumferential surface
is appropriately selected within the range of 0.3 to 2 mm, although it is not limited to this.
本実施例で、磁性部材、即ち磁性板２１は現像スリーブ
ｌＯｂの周面との間に−様な空隙（ｇ）を形成するべく
、現像スリーブ１’Ｏｂと同中心を有した幅（Ｗ）を有
した環状とされるが、その形状は図示される形状に限定
されるものではなく、設計者が所望に応じて種々の形状
とすることができる。重要なことは、磁性板２１が非接
触状態にて現像スリーブ１０ｂの周面に沿って配置され
ることである。又、磁性板２１の側面が現像スリブｔｏ
ｂ周面の法線に対してなす角度は現像剤の漏出をより確
実に防ぐ点で４５度以下が好ましい。図示する本実施例
では上記角度は０度、即ち、磁性板２１の側面は現像ス
リーブｌＯｂ周面に対して直角とされている。In this embodiment, the magnetic member, that is, the magnetic plate 21 has a width (W) concentric with the developing sleeve 1'Ob in order to form a -like gap (g) with the circumferential surface of the developing sleeve 1'Ob. However, the shape is not limited to the shape shown in the drawings, and can be made into various shapes as desired by the designer. What is important is that the magnetic plate 21 is arranged along the circumferential surface of the developing sleeve 10b in a non-contact manner. Also, the side surface of the magnetic plate 21 is connected to the developing sleeve to
The angle formed with respect to the normal to the circumferential surface b is preferably 45 degrees or less in order to more reliably prevent leakage of the developer. In the illustrated embodiment, the angle is 0 degrees, that is, the side surface of the magnetic plate 21 is perpendicular to the circumferential surface of the developing sleeve lOb.
又、磁性板２１は、現像スリーブ１０ｂの周面全部にわ
たって配置されるのが好ましいが、第１図に図示される
ように、現像スリーブｌＯｂの全周にわたって形成しな
くともよい。Furthermore, although it is preferable that the magnetic plate 21 be disposed over the entire circumference of the developing sleeve 10b, it does not have to be formed over the entire circumference of the developing sleeve lOb, as shown in FIG.
このように、現像スリーブｌＯｂの両端部に磁性板を配
置することにより、現像スリーブ１０ｂの内部に設けた
磁石ローラｌｏａの磁力によって磁性板２１が磁化され
、磁石ローラ１０ａと、該磁性板２１との間に磁気回路
が形成され、磁性板２１の現像スリーブ１０ｂ側先端部
に磁界が集中し、従って該磁性板と現像スリーブｌＯｂ
との間の空隙部（ｇ）に現像剤による密な磁気ブラシが
形成される。該磁気ブラシは、現像スリーブ１０ｂに沿
って現像容器側壁２ａと現像スリーブ１０ｂ表面との間
の隙間を通って軸受１２へと進入する現像剤を阻止する
作用をなす、つまり、磁性板２１と現像スリーブｆｏｂ
との間の空隙部（ｇ）に形成される現像剤による磁気ブ
ラシは端部シール部材としての機能をなす。In this way, by arranging the magnetic plates at both ends of the developing sleeve lOb, the magnetic plate 21 is magnetized by the magnetic force of the magnetic roller loa provided inside the developing sleeve 10b, and the magnetic plate 21 is magnetized by the magnetic force of the magnetic roller loa provided inside the developing sleeve 10b. A magnetic circuit is formed between the two, and a magnetic field is concentrated at the tip of the magnetic plate 21 on the side of the developing sleeve 10b, so that the magnetic plate and the developing sleeve lOb
A dense magnetic brush is formed by the developer in the gap (g) between the two. The magnetic brush acts to prevent the developer from entering the bearing 12 along the developing sleeve 10b through the gap between the developer container side wall 2a and the surface of the developing sleeve 10b. sleeve fob
A magnetic brush formed by the developer in the gap (g) between the two functions as an end sealing member.
第３図に本発明の他の実施例を示す。本実施例によると
、磁性板２１に隣接して先端部が現像スリーブｔａｂに
弾性的に当接する弾性体シートから成る補助シール部材
２３を並設することができる。該補助シール部材２３と
しては、例えば厚さ０．１−０．５ｍｍ程度のポリエチ
レンテレフタレート、ウレタンゴムシート等が好適であ
る。このように補助シール部材２３を設けることにより
、磁性板２１と現像スリーブｆｏｂとの間の空隙部（ｇ
）に形成された現像剤による磁気ブラシの一部が軸受１
２の方へと飛散するのを防止することができる。FIG. 3 shows another embodiment of the invention. According to this embodiment, the auxiliary seal member 23 made of an elastic sheet whose tip end elastically contacts the developing sleeve tab can be arranged adjacent to the magnetic plate 21 in parallel. As the auxiliary seal member 23, polyethylene terephthalate, urethane rubber sheet, etc. having a thickness of about 0.1 to 0.5 mm are suitable, for example. By providing the auxiliary seal member 23 in this way, the gap (g) between the magnetic plate 21 and the developing sleeve fob is
) A part of the magnetic brush formed by the developer is attached to the bearing 1.
It is possible to prevent the particles from scattering in the direction of 2.
第４図には、本発明の更に好ましい他の実施例が示めさ
れる。FIG. 4 shows another more preferred embodiment of the present invention.
本発明の現像装置によれば、磁石ローラ１０ａの磁極の
数及び配向位置は、第１図に図示するように構成する必
要はなく他の極数、或いは他の種々の配向位置にて構成
し得るが、本実施例のような磁極配置とされた場合には
、特にＮ３極、ＮＺ極の反発磁界形成部に隣接した空隙
部（ｇ）においては、現像剤による磁気ブラシの形成が
他に比べて弱くなる傾向がある。従って、もし斯る空隙
部分より現像剤が軸受１２の方へと進入した場合にはこ
の現像剤を捕獲するために、補助シール部材として磁石
２５を設けることができる。該磁石２５は、現像スリー
ブｌＯｂの周面に沿って磁性板２１と同じ領域にわたっ
て形成された環状磁石とされ、本実施例では内側表面が
Ｓ極に、外側表面がＮ極に着磁されており、特にＮ３極
、Ｎｚ極領領域らの現像剤の漏れをシールするべく構成
される。本実施例によると、−旦磁石２５で捕獲された
現像剤は、該磁石２５と現像スリーブ１０ｂ表面との間
の空隙部で磁気ブラシを形成し、それ以降にＮ３極、Ｎ
ｚ極領領域ら進入してくる現像剤の漏れをシールする機
能をなす。According to the developing device of the present invention, the number and orientation position of the magnetic poles of the magnet roller 10a need not be configured as shown in FIG. 1, but may be configured with a different number of poles or other various orientation positions. However, when the magnetic poles are arranged as in this example, especially in the gap (g) adjacent to the repulsion magnetic field forming part of the N3 pole and the NZ pole, the formation of a magnetic brush by the developer is difficult. It tends to be weaker in comparison. Therefore, if developer enters the bearing 12 through the gap, a magnet 25 can be provided as an auxiliary sealing member to capture the developer. The magnet 25 is an annular magnet formed along the circumferential surface of the developing sleeve lOb over the same area as the magnetic plate 21, and in this embodiment, the inner surface is magnetized to the S pole and the outer surface is magnetized to the N pole. In particular, it is configured to seal against leakage of developer from the N3 pole and Nz pole regions. According to this embodiment, the developer captured by the magnet 25 forms a magnetic brush in the gap between the magnet 25 and the surface of the developing sleeve 10b, and then the N3 pole, the N3 pole, and the N3 pole.
It functions to seal against leakage of developer entering from the z-polar region.
本発明者らの実験の結果によると、−ｈ記各実施例に従
った構成の現像装置は長期間の使用によっても現像容器
内の現像剤が軸受部１２から外部へと漏出したり、或い
は該軸受部１２内に進入し、軸受部の機能が減少したり
することはないことが実証された。According to the results of experiments conducted by the present inventors, the developing device configured according to each of the embodiments described in (h) does not cause the developer in the developing container to leak out from the bearing portion 12 even after long-term use. It has been demonstrated that the function of the bearing is not reduced by entering the bearing 12.
発」ＬΩ」１釆
以上説明したように、本発明に係る現像装置は、磁石を
内蔵した現像スリーブの如き現像剤担持体の両端部に磁
性部材を配置し、磁力線を集中させる構成とされるため
に、現像剤担持体両端部においてシール部材として機能
する現像剤の磁気ブラシが磁力線に沿って形成され、そ
れによって現像剤の外部への漏出を完全に防止すること
ができ、又、長期間の使用によっても現像剤担持体の運
動を阻害することがなく、常に円滑な現像作動を可能と
し、それによって現像剤凝集体をつくることなく、安定
した画像が長期に亘って得られるという利点を有する。As described above, the developing device according to the present invention is configured such that magnetic members are arranged at both ends of a developer carrier such as a developing sleeve containing a magnet to concentrate lines of magnetic force. Therefore, developer magnetic brushes that function as sealing members are formed along the lines of magnetic force at both ends of the developer carrier, which completely prevents developer from leaking to the outside. This has the advantage of not inhibiting the movement of the developer carrying member and allowing smooth development operation at all times, thereby ensuring that stable images can be obtained over a long period of time without forming developer aggregates. have
第１図は、本発明に係る現像装置の一実施例の断面図で
ある。
第２図、第３図及び第４図は、本発明に係る現像装置の
実施例の断面正面図で、片側の端部のみが図示される。
第５図は、従来の現像装置の断面図である。
第６図及び第７図は、従来の現像装置の断面正面図で、
片側の端部のみが図示される。
Ｏ
ａ：現像剤担持体
ｂ＝磁石
：磁性部材
：弾性体シート
：磁石FIG. 1 is a sectional view of an embodiment of a developing device according to the present invention. FIGS. 2, 3, and 4 are cross-sectional front views of embodiments of the developing device according to the present invention, in which only one end portion is illustrated. FIG. 5 is a sectional view of a conventional developing device. 6 and 7 are cross-sectional front views of a conventional developing device,
Only one end is shown. O a: Developer carrier b = Magnet: Magnetic member: Elastic sheet: Magnet
Claims (1)
記現像容器に回動自在に担持され、そして内部に磁石を
有することにより表面に現像剤を担持し搬送する現像剤
担持体とを有する現像装置において、前記現像剤担持体
の両端部には、該現像剤担持体の表面と所定の空隙をも
って該現像剤担持体の少なくとも一部の周面に沿って磁
性部材を配置し、該磁性部材と、該現像剤担持体内部に
配置された磁石とにより磁性部材の現像剤担持体側の面
に磁力線が集中するように磁気回路を形成せしめて該空
隙部に磁力線に沿って現像剤による磁気ブラシを形成し
、該磁気ブラシによって現像剤の外部への漏出をシール
することを特徴とする現像装置。 ２）磁性部材に隣接して補助シール部材を配置して成る
請求項１記載の現像装置。 ３）補助シール部材は弾性体シート又は磁石である請求
項２記載の現像装置。 ４）現像剤がキャリアとトナーからなる２成分現像剤で
ある請求項１記載の現像装置。 ５）現像剤が磁性トナーからなる１成分現像剤である請
求項１記載の現像装置。[Scope of Claims] 1) A developer container containing a developer containing magnetic particles, which is rotatably carried by the developer container, and has a magnet inside to carry and transport the developer on its surface. In a developing device having a developer carrier, magnetic conductors are provided at both ends of the developer carrier along the circumferential surface of at least a portion of the developer carrier with a predetermined gap between the surface of the developer carrier and a predetermined gap. A magnetic circuit is formed by the magnetic member and a magnet disposed inside the developer carrier so that lines of magnetic force are concentrated on the surface of the magnetic member on the developer carrier side, and lines of magnetic force are formed in the gap. A developing device characterized in that a magnetic brush is formed by a developer along the ridge, and the leakage of the developer to the outside is sealed by the magnetic brush. 2) The developing device according to claim 1, further comprising an auxiliary seal member disposed adjacent to the magnetic member. 3) The developing device according to claim 2, wherein the auxiliary seal member is an elastic sheet or a magnet. 4) The developing device according to claim 1, wherein the developer is a two-component developer consisting of a carrier and a toner. 5) The developing device according to claim 1, wherein the developer is a one-component developer made of magnetic toner.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1082849A JP2701162B2 (en) | 1989-03-31 | 1989-03-31 | Developing device |
| EP94200937A EP0608968B1 (en) | 1989-03-31 | 1990-03-27 | A developing apparatus |
| US07/499,729 US5177536A (en) | 1989-03-31 | 1990-03-27 | Developing apparatus having a magnetic seal |
| DE69033384T DE69033384T2 (en) | 1989-03-31 | 1990-03-27 | Processor |
| EP19900303206 EP0390472A3 (en) | 1989-03-31 | 1990-03-27 | A developing apparatus |
| EP96200413A EP0715227B1 (en) | 1989-03-31 | 1990-03-27 | A developing apparatus |
| DE69032352T DE69032352T2 (en) | 1989-03-31 | 1990-03-27 | Processor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1082849A JP2701162B2 (en) | 1989-03-31 | 1989-03-31 | Developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02262171A true JPH02262171A (en) | 1990-10-24 |
| JP2701162B2 JP2701162B2 (en) | 1998-01-21 |
Family
ID=13785824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1082849A Expired - Lifetime JP2701162B2 (en) | 1989-03-31 | 1989-03-31 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2701162B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0468379A (en) * | 1990-07-09 | 1992-03-04 | Sharp Corp | Developing device |
| US5177536A (en) * | 1989-03-31 | 1993-01-05 | Canon Kabushiki Kaisha | Developing apparatus having a magnetic seal |
| US5287148A (en) * | 1990-07-10 | 1994-02-15 | Canon Kabushiki Kaisha | Magnetic seal for a developing apparatus |
| US6408150B1 (en) | 1999-02-18 | 2002-06-18 | Canon Kabushiki Kaisha | Developing apparatus featuring first and second developer bearing members and first and second magnetic seal portions |
| US7421227B2 (en) | 2005-05-18 | 2008-09-02 | Kyocera Mita Corporation | Developing device and image forming apparatus |
| US9146504B2 (en) | 2013-10-11 | 2015-09-29 | Kyocera Document Solutions Inc. | Developing device having magnetic roller and image forming apparatus |
| US9268263B2 (en) | 2014-05-13 | 2016-02-23 | Canon Kabushiki Kaisha | Development apparatus and image forming apparatus |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6010276A (en) * | 1983-06-29 | 1985-01-19 | Matsushita Electric Ind Co Ltd | Developing device |
| JPS63124075A (en) * | 1986-11-13 | 1988-05-27 | Fujitsu Ltd | Magnetic brush developing device |
-
1989
- 1989-03-31 JP JP1082849A patent/JP2701162B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6010276A (en) * | 1983-06-29 | 1985-01-19 | Matsushita Electric Ind Co Ltd | Developing device |
| JPS63124075A (en) * | 1986-11-13 | 1988-05-27 | Fujitsu Ltd | Magnetic brush developing device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5177536A (en) * | 1989-03-31 | 1993-01-05 | Canon Kabushiki Kaisha | Developing apparatus having a magnetic seal |
| JPH0468379A (en) * | 1990-07-09 | 1992-03-04 | Sharp Corp | Developing device |
| US5287148A (en) * | 1990-07-10 | 1994-02-15 | Canon Kabushiki Kaisha | Magnetic seal for a developing apparatus |
| US6408150B1 (en) | 1999-02-18 | 2002-06-18 | Canon Kabushiki Kaisha | Developing apparatus featuring first and second developer bearing members and first and second magnetic seal portions |
| US7421227B2 (en) | 2005-05-18 | 2008-09-02 | Kyocera Mita Corporation | Developing device and image forming apparatus |
| US9146504B2 (en) | 2013-10-11 | 2015-09-29 | Kyocera Document Solutions Inc. | Developing device having magnetic roller and image forming apparatus |
| US9268263B2 (en) | 2014-05-13 | 2016-02-23 | Canon Kabushiki Kaisha | Development apparatus and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2701162B2 (en) | 1998-01-21 |
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