JPH07168449A - Image forming device and process cartridge - Google Patents
Image forming device and process cartridgeInfo
- Publication number
- JPH07168449A JPH07168449A JP5342694A JP34269493A JPH07168449A JP H07168449 A JPH07168449 A JP H07168449A JP 5342694 A JP5342694 A JP 5342694A JP 34269493 A JP34269493 A JP 34269493A JP H07168449 A JPH07168449 A JP H07168449A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnet
- image forming
- developing
- forming apparatus
- 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
Landscapes
- Magnetic Brush Developing In Electrophotography (AREA)
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
- Dry Development In Electrophotography (AREA)
- Electrophotography Configuration And Component (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば複写機やページ
プリンタ等とされる電子写真式或は静電記録式の画像形
成装置に関し、特に現像装置に特徴を有する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic or electrostatic recording type image forming apparatus such as a copying machine or a page printer, and is particularly characterized by a developing apparatus.
【０００２】[0002]
【従来の技術】プリンタや複写機等とされる画像形成装
置は、一様に帯電させた像担持体に選択的な露光をして
潜像を形成し、この潜像を現像剤担持体に付着したトナ
ーで顕像化すると共に、該トナー像を記録媒体に転写し
て画像記録を行う。このような装置にあっては、トナー
が無くなる都度補給しなければならず、このトナーの補
給作業が煩わしいばかりか、汚れを伴うこともある。
又、各部材のメンテナンスは専門のサービスマンでなけ
れば行うことができず、ユーザーには不便を伴うことが
多かった。2. Description of the Related Art An image forming apparatus such as a printer or a copying machine forms a latent image by selectively exposing a uniformly charged image carrier to form a latent image on a developer carrier. The toner is made visible and the toner image is transferred to a recording medium to record an image. In such an apparatus, the toner has to be replenished each time it runs out, and the toner replenishment work is not only troublesome, but also may be contaminated.
Further, maintenance of each member can be performed only by a specialized service person, and this is often inconvenient for the user.
【０００３】そこで、上記像担持体、帯電装置、現像装
置、クリーニング装置等を一体構造にまとめてカートリ
ッジ化することにより、ユーザーが該カートリッジを装
置本体に装填することによって、トナー補給や寿命に達
した像担持体の部品交換を可能とし、メンテナンスを容
易にしたものが実用化されている。Therefore, the image carrier, the charging device, the developing device, the cleaning device, and the like are integrated into a cartridge to be a cartridge, and the user loads the cartridge into the main body of the device to reach the toner supply and the life. It has been put into practical use that the parts of the image carrier can be replaced and the maintenance is easy.
【０００４】このようなプロセスカートリッジに組み込
まれた現像装置において、回転する現像剤担持体の両端
部には、現像領域外へトナーが流出するのを防止するた
めのシール部材が設けてある。従来、この現像剤の流出
を防ぐシール部材には、フェルトや発泡ゴム等の弾性体
のシール部材が広く利用されている。In the developing device incorporated in such a process cartridge, seal members are provided at both ends of the rotating developer carrier to prevent the toner from flowing out of the developing area. Conventionally, an elastic seal member such as felt or foamed rubber has been widely used as a seal member for preventing the developer from flowing out.
【０００５】上記のような現像装置の代表的な例を図
９、及び図１０に示す。図９は従来の現像装置の主断面
構成図、図１０は従来の現像装置要部の長手方向の断面
構成図である。Representative examples of the developing device as described above are shown in FIGS. 9 and 10. FIG. 9 is a main sectional configuration diagram of a conventional developing device, and FIG. 10 is a longitudinal sectional configuration diagram of a main part of the conventional developing device.
【０００６】図９に示すように、現像剤担持体である現
像スリーブ４ａはその内部に磁界発生手段である磁石４
ｂを有し、トナー容器３にスリーブ軸受５を介して回転
可能に支持されている。トナー容器３から供給されたト
ナーは磁力により現像スリーブ４ａ表面に付着し、現像
ブレード４ｃにより層厚が一定に規制された後、像担持
体である感光ドラム１上の潜像にトナーが付着される。
又、現像スリーブ４ｂの両端部には弾性シール部材４ｄ
が、感光ドラム１と対向する側のトナー容器３に固定さ
れており、現像スリーブ４ｂの外周面に圧着させること
によりトナーの流出を防止している。As shown in FIG. 9, a developing sleeve 4a which is a developer bearing member has a magnet 4 which is a magnetic field generating means therein.
b, and is rotatably supported by the toner container 3 via a sleeve bearing 5. The toner supplied from the toner container 3 adheres to the surface of the developing sleeve 4a by the magnetic force, and the developing blade 4c regulates the layer thickness to a constant value, and then the toner adheres to the latent image on the photosensitive drum 1 which is an image carrier. It
Further, elastic seal members 4d are provided on both ends of the developing sleeve 4b.
However, the toner is prevented from flowing out by being fixed to the toner container 3 on the side facing the photosensitive drum 1, and by being pressed against the outer peripheral surface of the developing sleeve 4b.
【０００７】しかしながら、このような構成のものでは
現像スリーブ４ａの外周面に圧接した弾性シール部材４
ｄによる負荷が大きく、又、現像スリーブ４ａとの接触
により弾性シール部材４ｄが劣化し、シール性が悪化す
る等の問題があった。更に、現像スリーブ４ａと弾性シ
ール部材４ｄとの間に僅かであるがトナーが侵入してし
まう場合があり、この侵入したトナーが凝集・融着を起
こして画像に白スジ等が生じることがあった。However, in such a structure, the elastic seal member 4 pressed against the outer peripheral surface of the developing sleeve 4a.
There is a problem that the load due to d is large, and the elastic seal member 4d deteriorates due to contact with the developing sleeve 4a, which deteriorates the sealing property. Further, the toner may intrude between the developing sleeve 4a and the elastic seal member 4d, though a little, and the intruding toner may cause cohesion and fusion to cause white lines or the like in the image. It was
【０００８】そこでこれらの問題を解決すべく、現像ス
リーブの両端部に一定の間隙をもって磁性体のシール部
材を配置し、これによりトナーの流出を防止する構成を
備えた現像装置が提案されている。In order to solve these problems, there has been proposed a developing device having a structure in which magnetic seal members are arranged at both ends of the developing sleeve with a constant gap to prevent the toner from flowing out. .
【０００９】この現像装置は、図１１及び図１２に示す
ように、磁性体シール部材ｄ’が現像スリーブ４ａの両
端部にその外周面と一定間隙ｇを隔てて、感光ドラム１
に対向する側のトナー容器３に固定されている。現像ス
リーブ４ａは磁石４ｂを内包しており、磁性体シール部
材４ｄ’と磁石４ｂの磁極との間に集中磁界を形成し、
間隙ｇに走る磁束に沿ってトナーを介在させて磁気ブラ
シを形成し、これによりトナーが現像領域外に流出する
のを防止している。In this developing device, as shown in FIGS. 11 and 12, a magnetic material sealing member d'is provided at both ends of the developing sleeve 4a with a constant gap g from the outer peripheral surface of the photosensitive drum 1.
It is fixed to the toner container 3 on the side opposite to. The developing sleeve 4a contains a magnet 4b and forms a concentrated magnetic field between the magnetic seal member 4d 'and the magnetic pole of the magnet 4b.
The magnetic brush is formed by interposing the toner along the magnetic flux running in the gap g, thereby preventing the toner from flowing out of the developing area.
【００１０】このような構成の現像装置は、現像スリー
ブと磁性体シール部材が非接触であるため、現像スリー
ブの回転トルクが著しく小さく、従って、駆動モータも
小型で低価格なものでよい。又、磨耗等がないのでその
使用は半永久的であり、リサイクルにも対応可能であ
る。In the developing device having such a structure, since the developing sleeve and the magnetic material sealing member are not in contact with each other, the rotating torque of the developing sleeve is remarkably small. Therefore, the driving motor may be small and inexpensive. In addition, since it is not worn, it is semi-permanent and can be recycled.
【００１１】[0011]
【発明が解決しようとする課題】しかしながら、上記磁
性体シール部材を用いた現像装置において、現像剤のシ
ール能力は十分満足がいくものではなかった。特に磁石
４ｂの磁極と磁極の間、つまり磁極の着磁されていない
部分に磁束の走らない、疎なる部分ができる。従って、
例えばプロセスカートリッジのユーザー操作性を考慮し
た場合、特にプロセスカートリッジを画像形成装置本体
に装着する際などの衝撃が加わる場合等は、磁束の疎な
る部分から現像剤の漏れが発生する恐れがあり、そのシ
ール性に大きな不安があった。However, in the developing device using the above-mentioned magnetic material sealing member, the sealing ability of the developer is not sufficiently satisfactory. In particular, between the magnetic poles of the magnet 4b, that is, in the non-magnetized portion of the magnetic pole, there is a sparse portion where the magnetic flux does not run. Therefore,
For example, in consideration of user operability of the process cartridge, especially when a shock is applied when the process cartridge is attached to the main body of the image forming apparatus, there is a possibility that the developer may leak from the portion where the magnetic flux is sparse. There was great concern about the sealing properties.
【００１２】従って、本発明の目的は、ユーザー操作性
がよく、衝撃等が加わった場合においてもシール性能を
十分に発揮し、なおかつ現像剤担持体への負荷が小さく
長期使用にも耐えうるシール部材を有する現像装置を備
えた画像形成装置を提供することである。Accordingly, an object of the present invention is to provide a seal which has good user operability, exhibits a sufficient sealing performance even when a shock or the like is applied, and has a small load on the developer carrying member and can withstand long-term use. An object of the present invention is to provide an image forming apparatus including a developing device having a member.
【００１３】[0013]
【課題を解決するための手段】上記目的は本発明に係る
画像形成装置にて達成される。要約すれば、本発明は、
現像剤を収容する現像容器と、該現像容器に回転自在に
支持され内部に磁石を配置することにより現像剤を像担
持体に担持搬送する現像剤担持体とを有する現像装置を
具備した画像形成装置において、前記現像剤担持体の両
端部外周面と所定間隙をもって磁性部材を配置し、前記
磁石の両端部が前記磁性部材の内周面に対向する部分に
周方向にＮＳ極を多磁極に着磁してなることを特徴とす
る画像形成装置である。The above object can be achieved by an image forming apparatus according to the present invention. In summary, the present invention is
Image formation provided with a developing device having a developing container for accommodating the developer, and a developer carrying member for carrying the developer on the image carrying member by rotatably supporting the developing container and arranging a magnet inside thereof. In the apparatus, magnetic members are arranged with a predetermined gap between the outer peripheral surfaces of both ends of the developer carrying member, and NS poles are provided with multiple magnetic poles in the circumferential direction at portions where both end portions of the magnet face the inner peripheral surface of the magnetic member. An image forming apparatus characterized by being magnetized.
【００１４】好ましくは、前記磁石の両端部の多磁極に
着磁した前記部分は、前記磁石とは別部材である。Preferably, the portions magnetized in the multi-poles at both ends of the magnet are members separate from the magnet.
【００１５】本発明の他の態様に、現像剤を収容する現
像容器と、該現像容器に回転自在に支持され内部に磁石
を配置することにより現像剤を像担持体に担持搬送する
現像剤担持体とを有する現像装置を具備した画像形成装
置において、前記磁石の両端部に磁性体リングを取り付
け、該磁性体リングと対向する位置に内周面をＮＳ極に
多磁極に着磁した磁石シール部材を、前記磁性体リング
を覆うように配置してなることを特徴とする画像形成装
置が提供される。According to another aspect of the present invention, a developer container for accommodating the developer and a developer carrying device for carrying and carrying the developer on an image carrier by disposing a magnet rotatably supported by the developer container therein. In an image forming apparatus including a developing device having a body, a magnetic ring is attached to both ends of the magnet, and a magnet seal having a plurality of magnetic poles whose inner peripheral surface is an NS pole at a position facing the magnetic ring. An image forming apparatus is provided, in which members are arranged so as to cover the magnetic ring.
【００１６】前記磁石シール部材の外周面に磁性体シー
ト部材を配置するのが好ましい。It is preferable to dispose a magnetic sheet member on the outer peripheral surface of the magnet seal member.
【００１７】又、本発明の他の態様によれば、少なくと
も像担持体が、該像担持体の帯電手段及び前記像担持体
のクリーニング手段と、又はいずれか一方と一体に形成
され、画像形成装置本体から着脱可能に形成されたプロ
セスカートリッジが提供される。According to another aspect of the present invention, at least the image carrier is integrally formed with a charging unit of the image carrier and a cleaning unit of the image carrier, or any one of them, to form an image. Provided is a process cartridge detachably formed from an apparatus main body.
【００１８】[0018]
【実施例】以下、本発明に係る画像形成装置の実施例を
図面に則して更に詳しく説明する。尚、前出の部材と同
一の部材については同一符号を付するものとする。又、
次に説明する実施例にては、本発明は、例えば図８に示
されるような電子写真画像形成装置に具現化されるもの
として説明するが、これに限定されるものではない。Embodiments of the image forming apparatus according to the present invention will be described below in more detail with reference to the drawings. The same members as those described above are designated by the same reference numerals. or,
In the embodiments described below, the present invention is described as being embodied in an electrophotographic image forming apparatus as shown in, for example, FIG. 8, but the present invention is not limited to this.
【００１９】図８にて、電子写真画像形成装置は、像担
持体である感光ドラム１を回転自在に設け、該感光ドラ
ム１を帯電装置２で一様に帯電し、次に例えばレーザの
ような発光素子１３によって情報信号を露光して静電潜
像を形成し、現像装置４で可視像化する。次に該可視像
を転写帯電器１５により転写紙１６に転写し、更に定着
装置１７にて定着して永久画像を得る。又、感光ドラム
１上の転写残トナーはクリーニング装置６により除去す
る。In FIG. 8, the electrophotographic image forming apparatus is provided with a photosensitive drum 1 which is an image carrier rotatably, and the photosensitive drum 1 is uniformly charged by a charging device 2. Then, for example, a laser is used. The light emitting element 13 exposes the information signal to form an electrostatic latent image, which is visualized by the developing device 4. Next, the visible image is transferred onto the transfer paper 16 by the transfer charger 15, and further fixed by the fixing device 17 to obtain a permanent image. Further, the transfer residual toner on the photosensitive drum 1 is removed by the cleaning device 6.
【００２０】実施例１ 本発明による画像形成装置の現像装置の第１実施例につ
いて、図１ないし図３を参照して説明する。同図にて、
現像装置４は画像形成装置に着脱自在なプロセスカート
リッジに組み込まれている。図１はプロセスカートリッ
ジの断面構成図、図２は現像装置の主断面構成図、図３
はその長手方向の断面構成図を示している。Embodiment 1 A first embodiment of the developing device of the image forming apparatus according to the present invention will be described with reference to FIGS. In the figure,
The developing device 4 is incorporated in a process cartridge that is detachably attached to the image forming apparatus. FIG. 1 is a sectional configuration diagram of a process cartridge, FIG. 2 is a main sectional configuration diagram of a developing device, and FIG.
Shows a sectional configuration view in the longitudinal direction.
【００２１】プロセスカートリッジは、感光ドラム１
と、少なくとも１つのプロセス手段を備えたものであ
る。例えば感光ドラム１の表面を帯電させる帯電装置
２、感光ドラム１にトナー像を形成する現像装置４、感
光ドラム１表面に残留したトナーを除去するためのクリ
ーニング装置６等である。本実施例のプロセスカートリ
ッジは、図１に示すように像担持体である電子写真感光
ドラム１の周囲に帯電装置２、トナー（現像剤）を収容
するトナー装置３を具備した現像装置４、及びクリーニ
ング装置６を配置し、枠体７、８からなるハウジングで
覆って一体的にカートリッジ化し、画像形成装置本体に
対して着脱自在に構成している。The process cartridge is the photosensitive drum 1.
And at least one process means. For example, a charging device 2 that charges the surface of the photosensitive drum 1, a developing device 4 that forms a toner image on the photosensitive drum 1, a cleaning device 6 that removes toner remaining on the surface of the photosensitive drum 1, and the like. As shown in FIG. 1, the process cartridge of this embodiment includes a charging device 2, a developing device 4 having a toner device 3 for containing toner (developer) around an electrophotographic photosensitive drum 1 which is an image carrier, and The cleaning device 6 is arranged and covered with a housing composed of frames 7 and 8 to integrally form a cartridge, which is configured to be detachable from the main body of the image forming apparatus.
【００２２】現像装置４には、磁性部材たる磁性体シー
ル部材４ｄ’が現像スリーブ４ａの両端部にその外周面
と一定間隙ｇを隔て、感光ドラム１に対向する側のトナ
ー容器３に固定されており、磁性体シール部材４ｄ’と
現像スリーブ４ａに内包される磁石４ｂの磁極との間に
集中磁界を形成し、間隙ｇに走る磁束に沿ってトナーを
介在させ磁気ブラシを形成することでトナーが現像領域
外に流出するのを防止している。このとき、前記間隔ｇ
に介在させるトナーは磁性トナーである。一方、現像容
器内に収納されるトナーは磁性トナーに限らず非磁性ト
ナーでもよい。In the developing device 4, magnetic seal members 4d ', which are magnetic members, are fixed to the toner container 3 on the side facing the photosensitive drum 1 at both ends of the developing sleeve 4a with a constant gap g from the outer peripheral surface thereof. By forming a concentrated magnetic field between the magnetic seal member 4d ′ and the magnetic pole of the magnet 4b included in the developing sleeve 4a, the toner is interposed along the magnetic flux running in the gap g to form a magnetic brush. Toner is prevented from flowing out of the developing area. At this time, the interval g
The toner intervening in is a magnetic toner. On the other hand, the toner contained in the developing container is not limited to the magnetic toner and may be a non-magnetic toner.
【００２３】本実施例にては、図２及び図３に示すよう
に磁石４ｂの両端部の、磁性体シール部材４ｄ’の内周
面に対向する部分４ｂ’に、その周方向に沿って多数の
ＮＳ極を着磁している。In the present embodiment, as shown in FIGS. 2 and 3, along both sides of the magnet 4b, the portions 4b 'facing the inner peripheral surface of the magnetic material sealing member 4d' are arranged along the circumferential direction thereof. A large number of NS poles are magnetized.
【００２４】これにより、磁石４ｂに着磁されている磁
極が従来に比べ多磁極になっている分、磁極と磁極の間
隔は狭まり、着磁のされていない部分即ち磁束の疎なる
部分を小さくすることができる。その結果、現像スリー
ブ４ａと磁性体シール部材４ｄ’との間隙ｇに走る磁束
はより密となり、シール性能が向上する。As a result, since the number of magnetic poles magnetized by the magnet 4b is larger than that of the conventional magnetic pole, the gap between the magnetic poles is narrowed, and the non-magnetized portion, that is, the magnetic flux sparse portion is reduced. can do. As a result, the magnetic flux running in the gap g between the developing sleeve 4a and the magnetic seal member 4d 'becomes denser, and the sealing performance is improved.
【００２５】尚、本実施例では、磁石４ｂの両端部の多
磁極化した部分４ｂ’において、ＮＳ極を全周にわたっ
て着磁した例を示したが、磁性体シール部材４ｄ’に内
包される半周部分のみ着磁した場合でも同様の効果が得
られる。In this embodiment, the NS pole is magnetized over the entire circumference in the multi-pole portions 4b 'at both ends of the magnet 4b, but it is included in the magnetic seal member 4d'. The same effect can be obtained even when only the half circumference is magnetized.
【００２６】また、磁石４ｂの両端部の多磁極化した部
分４ｂ’に着磁される磁極の数は、特に限定されるもの
ではない。The number of magnetic poles magnetized in the multi-pole portions 4b 'at both ends of the magnet 4b is not particularly limited.
【００２７】実施例２ 次に、図４により第２実施例について説明する。Second Embodiment Next, a second embodiment will be described with reference to FIG.
【００２８】第１実施例において、磁石４ｂの両端部の
多磁極した部分４ｂ’が、磁石４ｂの一部を着磁した構
成、即ち多磁極した部分４ｂ’と磁石４ｂとが一体成形
である例を示したが、これを別部材にした構成にしても
よい。In the first embodiment, the multi-pole portions 4b 'of both ends of the magnet 4b are magnetized in a part of the magnet 4b, that is, the multi-pole portion 4b' and the magnet 4b are integrally formed. Although an example is shown, this may be configured as a separate member.
【００２９】図４に示すように、磁石４ｂの両端部の磁
性体シール部材４ｄ’と対応する部分を磁石４ｂの外径
より小径化し、そこに別体として磁石４ｂと同じ外径
で、その外周面を多磁極に着磁した部材４ｂ”をはめ込
む構成としたものである。これによっても第１実施例と
同様の効果を得ることができる。As shown in FIG. 4, the portions of both ends of the magnet 4b corresponding to the magnetic material sealing members 4d 'are made smaller in diameter than the outer diameter of the magnet 4b. The configuration is such that a member 4b ″ whose outer peripheral surface is magnetized to have multiple magnetic poles is fitted therein. With this, the same effect as that of the first embodiment can be obtained.
【００３０】実施例３ 次に図５及び６に沿って本発明の第３実施例について説
明する。Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIGS.
【００３１】第１及び第２実施例では、磁石４ｂの両端
部の磁性体シール部材４ｄ’と対向する部分４ｂ’を多
磁極化することで磁束の疎なる部分を小さくし、シール
性を向上させる例を示したが、逆に磁石４ｂ側に磁性体
を配置し、シール部材の方を多磁極に着磁して、磁力を
もたせた構成にすることもできる。In the first and second embodiments, the portions 4b 'facing both ends of the magnet 4b facing the magnetic seal member 4d' are made to have multiple magnetic poles to reduce the magnetic flux sparse portion and improve the sealing performance. However, it is also possible to conversely arrange a magnetic body on the side of the magnet 4b and magnetize the seal member with multiple magnetic poles to give a magnetic force.
【００３２】図５及び６に示すように、磁石４ｂの両端
部に磁性部材たる磁性体リング９を配置し、更に磁性体
リング９と対向する位置に、内周面をＮＳ極の多磁極に
着磁した磁石シール部材４ｅを、磁性体リング９を覆う
ように配置する。As shown in FIGS. 5 and 6, a magnetic material ring 9 serving as a magnetic member is arranged at both ends of the magnet 4b, and at the position facing the magnetic material ring 9, the inner peripheral surface is made into a multi-pole NS pole. The magnetized magnet seal member 4e is arranged so as to cover the magnetic ring 9.
【００３３】これにより、磁性体リング９と磁石シール
部材４ｅとの間には磁界が形成され、第１実施例と同
様、磁束の疎なる部分の小さい、より密な磁束を現像ス
リーブ４ａと磁石シール部材４ｅとの間隙ｇに走らせる
ことができ、シール性能が向上する。As a result, a magnetic field is formed between the magnetic ring 9 and the magnet seal member 4e, and as in the first embodiment, a denser magnetic flux having a small magnetic flux sparse portion can be applied to the developing sleeve 4a and the magnet. It can run in the gap g with the seal member 4e, and the sealing performance is improved.
【００３４】尚、磁石シール部材４ｅの内周面に着磁さ
れる磁極の数は、第１実施例と同様、特に限定されるも
のではない。The number of magnetic poles magnetized on the inner peripheral surface of the magnet seal member 4e is not particularly limited, as in the first embodiment.
【００３５】実施例４ 図７により本発明の第４実施例について説明する。Fourth Embodiment A fourth embodiment of the present invention will be described with reference to FIG.
【００３６】第３実施例において、磁石４ｂの両端部に
磁性体リング９を配置し、更に内周面を多磁極に着磁し
た磁石シール部材４ｅを磁性体リング９に対向する位置
に配置する構成を示したが、図７のように磁石シール部
材４ｅの外周面に薄い磁性体シート部材１０を配置する
ことで、更にシール性能を向上することができる。In the third embodiment, magnetic material rings 9 are arranged at both ends of the magnet 4b, and a magnet seal member 4e whose inner peripheral surface is magnetized with multiple magnetic poles is arranged at a position facing the magnetic material ring 9. Although the configuration is shown, the sealing performance can be further improved by disposing the thin magnetic sheet member 10 on the outer peripheral surface of the magnet seal member 4e as shown in FIG.
【００３７】これは、磁石シール部材４ｅの内周面の磁
極に対し、その外周面にも磁極が多磁極に着磁されてお
り、そのとき磁石シール部材４ｅの外周面の磁気回路を
考えると、磁束はＮ極から空気中を経てＳ極へと走って
いる。そこで、磁性体シート部材１０を配置することに
より、磁束が空気中より抵抗が非常に小さい磁性体シー
ト部材１０内部を走るようになる。従って、磁石シール
部材４ｅの全体の磁気回路の抵抗も小さくなり、その結
果現像スリーブ４ａと磁石シール部材４ｅとの間隙ｇを
走る磁束をより密にすることができ、シール性能が向上
する。This is because the magnetic poles on the inner peripheral surface of the magnet seal member 4e are magnetized in multiple magnetic poles also on the outer peripheral surface thereof. Considering the magnetic circuit on the outer peripheral surface of the magnet seal member 4e at that time. , The magnetic flux runs from the north pole through the air to the south pole. Therefore, by disposing the magnetic material sheet member 10, the magnetic flux runs inside the magnetic material sheet member 10 having a resistance much smaller than that in the air. Therefore, the resistance of the entire magnetic circuit of the magnet seal member 4e is also reduced, and as a result, the magnetic flux running in the gap g between the developing sleeve 4a and the magnet seal member 4e can be made denser and the sealing performance is improved.
【００３８】以上の第１ないし第４の実施例において
は、現像装置４がプロセスカートリッジに組み込まれて
いるものについて説明したが、本発明にかかる現像装置
はプロセスカートリッジを使用しない構成の画像形成装
置に対しても、ほぼ同じ構成で適用し、ほぼ同じ効果を
上げることができるのは勿論である。Although the developing device 4 is incorporated in the process cartridge in the above-described first to fourth embodiments, the developing device according to the present invention does not use the process cartridge. It is needless to say that the above can be applied with almost the same configuration and the same effect can be obtained.
【００３９】[0039]
【発明の効果】以上の説明から明らかなように、本発明
による画像形成装置は、現像剤担持体の両端部外周面と
所定間隙をもって磁性部材を配置し、前記現像担持体に
内蔵された磁石の両端部が前記磁性部材の内周面に対向
する部分に周方向にＮＳ極を多磁極に着磁してなる構成
としたことにより、前記磁性部材と前記磁石との間隙に
磁界が形成され、該間隙に走る磁束に沿って現像剤によ
る磁気ブラシを形成することにより、現像剤の外部への
流出を防止することができる。これにより、現像剤のシ
ール性能が向上し、ユーザー操作性を改善することがで
きる。As is apparent from the above description, in the image forming apparatus according to the present invention, the magnetic members are arranged with a predetermined gap between the outer peripheral surfaces of both ends of the developer carrying member, and the magnets built in the developing carrying member. A magnetic field is formed in the gap between the magnetic member and the magnet by arranging the NS poles in the circumferential direction so as to magnetize multiple magnetic poles in a portion where both ends of the magnetic member face the inner peripheral surface of the magnetic member. By forming a magnetic brush of the developer along the magnetic flux running in the gap, it is possible to prevent the developer from flowing out. Thereby, the sealing performance of the developer is improved, and the user operability can be improved.
【００４０】又、本発明による画像形成装置は、現像担
持体に内蔵された磁石の両端部に磁性体リングを取り付
け、該磁性体リングと対向する位置に内周面をＮＳ極に
多磁極に着磁した磁石シール部材を、前記磁性体リング
を覆うように配置してなる構成としたことにより、現像
剤の外部への流出を防止でき、上記と同様の効果を得る
ことができる。Further, in the image forming apparatus according to the present invention, magnetic material rings are attached to both ends of the magnet built in the developing carrier, and the inner peripheral surface is provided with NS poles and multiple magnetic poles at positions opposed to the magnetic material rings. By arranging the magnetized magnet seal member so as to cover the magnetic ring, the developer can be prevented from flowing out, and the same effect as described above can be obtained.
【図１】本発明に係る現像装置を有するプロセスカート
リッジの断面構成図である。FIG. 1 is a cross-sectional configuration diagram of a process cartridge having a developing device according to the present invention.
【図２】本発明に係る第１実施例の現像装置要部の断面
構成図である。FIG. 2 is a cross-sectional configuration diagram of a main part of the developing device according to the first embodiment of the present invention.
【図３】図２の現像装置要部の長手方向の断面構成図で
ある。FIG. 3 is a longitudinal cross-sectional configuration diagram of a main part of the developing device of FIG.
【図４】本発明に係る第２実施例の現像装置要部の長手
方向の断面構成図である。FIG. 4 is a longitudinal cross-sectional configuration diagram of a main part of a developing device according to a second embodiment of the invention.
【図５】本発明に係る第３実施例の現像装置要部の主断
面構成図である。FIG. 5 is a main cross-sectional configuration diagram of a main part of a developing device according to a third embodiment of the present invention.
【図６】本発明に係る第３実施例の現像装置要部の長手
方向の断面構成図である。FIG. 6 is a longitudinal cross-sectional configuration diagram of essential parts of a developing device according to a third embodiment of the present invention.
【図７】本発明に係る第４実施例の現像装置要部の主断
面構成図である。FIG. 7 is a main cross-sectional configuration diagram of a main part of a developing device according to a fourth embodiment of the present invention.
【図８】本発明が具現化できる電子写真式画像形成装置
の概略構成図である。FIG. 8 is a schematic configuration diagram of an electrophotographic image forming apparatus in which the present invention can be embodied.
【図９】磁性体シール部材を用いた従来のプロセスカー
トリッジの現像器の要部断面構成図である。FIG. 9 is a cross-sectional configuration diagram of a main part of a conventional developing device of a process cartridge using a magnetic seal member.
【図１０】磁性体シール部材を用いた従来現像装置要部
の長手方向断面構成図である。FIG. 10 is a longitudinal cross-sectional configuration diagram of a main part of a conventional developing device using a magnetic seal member.
【図１１】弾性体シール部材を用いた従来現像装置の主
断面構成図である。FIG. 11 is a main cross-sectional configuration diagram of a conventional developing device using an elastic seal member.
【図１２】弾性体シール部材を用いた従来現像装置要部
の長手方向断面構成図である。FIG. 12 is a longitudinal cross-sectional configuration diagram of a main part of a conventional developing device using an elastic seal member.
１ 感光ドラム（像担持体） ３ トナー容器（現像容器） ４ａ 現像スリーブ（現像剤担持体） ４ｂ 磁石 ４ｂ’ 磁石の多磁極部 ４ｂ” 別体の多磁極磁石 ４ｄ’ 磁性体シール部材（磁性部材） ４ｅ 多磁極シール部材 ９ 磁性体リング DESCRIPTION OF SYMBOLS 1 Photosensitive drum (image carrier) 3 Toner container (developing container) 4a Developing sleeve (developer carrier) 4b Magnet 4b 'Multi-pole part of magnet 4b "Separate multi-pole magnet 4d' Magnetic seal member (magnetic member) ) 4e Multi-pole seal member 9 Magnetic ring
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｇ０３Ｇ 21/16 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location G03G 21/16
Claims (5)
器に回転自在に支持され内部に磁石を配置することによ
り現像剤を像担持体に担持搬送する現像剤担持体とを有
する現像装置を具備した画像形成装置において、 前記現像剤担持体の両端部外周面と所定間隙をもって磁
性部材を配置し、前記磁石の両端部が前記磁性部材の内
周面に対向する部分に周方向にＮＳ極を多磁極に着磁し
てなることを特徴とする画像形成装置。1. A developing device having a developing container for accommodating a developing agent, and a developing agent carrier for rotatably supported by the developing container and having a magnet arranged therein to carry and convey the developing agent to an image carrier. In the image forming apparatus, a magnetic member is arranged with a predetermined gap from the outer peripheral surfaces of both ends of the developer carrying member, and the both ends of the magnet are NS in the circumferential direction at a portion facing the inner peripheral surface of the magnetic member. An image forming apparatus having a plurality of magnetic poles.
記部分が、該磁石とは別部材であることを特徴とする請
求項１の画像形成装置。2. The image forming apparatus according to claim 1, wherein the magnetized portions of the magnetic poles at both ends of the magnet are separate members from the magnet.
器に回転自在に支持され内部に磁石を配置することによ
り現像剤を像担持体に担持搬送する現像剤担持体とを有
する現像装置を具備した画像形成装置において、 前記磁石の両端部に磁性体リングを取り付け、該磁性体
リングと対向する位置に内周面をＮＳ極に多磁極に着磁
した磁石シール部材を、前記磁性体リングを覆うように
配置してなることを特徴とする画像形成装置。3. A developing device having a developing container for accommodating the developing agent, and a developing agent carrier for rotatably supporting the developing container and arranging a magnet therein for carrying and carrying the developing agent on an image carrier. In the image forming apparatus having the above-mentioned magnetic member, magnetic material rings are attached to both ends of the magnet, and a magnet seal member having an inner peripheral surface magnetized to an NS pole in multiple magnetic poles is provided at a position facing the magnetic material rings. An image forming apparatus, wherein the image forming apparatus is arranged so as to cover the ring.
シート部材を配置したことを特徴とする請求項３の画像
形成装置。4. The image forming apparatus according to claim 3, wherein a magnetic sheet member is arranged on the outer peripheral surface of the magnet seal member.
項に記載の現像装置と、像担持体と、該像担持体の帯電
手段及び／又は前記像担持体のクリーニング手段とを一
体的に形成し、画像形成装置本体から着脱可能とされた
ことを特徴とするプロセスカートリッジ。5. A developing device according to any one of claims 1 to 4, an image carrier, and a charging unit for the image carrier and / or a cleaning unit for the image carrier are integrally formed. A process cartridge that is formed and is detachable from the main body of the image forming apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5342694A JP3001760B2 (en) | 1993-12-16 | 1993-12-16 | Developing device and process cartridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5342694A JP3001760B2 (en) | 1993-12-16 | 1993-12-16 | Developing device and process cartridge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07168449A true JPH07168449A (en) | 1995-07-04 |
| JP3001760B2 JP3001760B2 (en) | 2000-01-24 |
Family
ID=18355777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5342694A Expired - Fee Related JP3001760B2 (en) | 1993-12-16 | 1993-12-16 | Developing device and process cartridge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3001760B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0821288A1 (en) * | 1996-07-26 | 1998-01-28 | Canon Kabushiki Kaisha | Developing device |
| EP0822465A1 (en) * | 1996-08-01 | 1998-02-04 | Canon Kabushiki Kaisha | Developing device |
| EP0915392A1 (en) * | 1997-10-29 | 1999-05-12 | Canon Kabushiki Kaisha | Developing apparatus |
| JP2006184524A (en) * | 2004-12-27 | 2006-07-13 | Kyocera Mita Corp | Developing device and image forming apparatus with same |
| JP2011186213A (en) * | 2010-03-09 | 2011-09-22 | Ricoh Co Ltd | Developing device for electrophotographic-system image forming apparatus |
-
1993
- 1993-12-16 JP JP5342694A patent/JP3001760B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0821288A1 (en) * | 1996-07-26 | 1998-01-28 | Canon Kabushiki Kaisha | Developing device |
| US6160976A (en) * | 1996-07-26 | 2000-12-12 | Canon Kabushiki Kaisha | Developing device having magnetic seals |
| EP0822465A1 (en) * | 1996-08-01 | 1998-02-04 | Canon Kabushiki Kaisha | Developing device |
| US5812909A (en) * | 1996-08-01 | 1998-09-22 | Canon Kabushiki Kaisha | Developing device |
| EP0915392A1 (en) * | 1997-10-29 | 1999-05-12 | Canon Kabushiki Kaisha | Developing apparatus |
| US6029030A (en) * | 1997-10-29 | 2000-02-22 | Canon Kabushiki Kaisha | Developing apparatus with magnetic seal |
| AU755064B2 (en) * | 1997-10-29 | 2002-12-05 | Canon Kabushiki Kaisha | Developing apparatus |
| JP2006184524A (en) * | 2004-12-27 | 2006-07-13 | Kyocera Mita Corp | Developing device and image forming apparatus with same |
| JP2011186213A (en) * | 2010-03-09 | 2011-09-22 | Ricoh Co Ltd | Developing device for electrophotographic-system image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3001760B2 (en) | 2000-01-24 |
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