JPH0862978A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPH0862978A JPH0862978A JP22411994A JP22411994A JPH0862978A JP H0862978 A JPH0862978 A JP H0862978A JP 22411994 A JP22411994 A JP 22411994A JP 22411994 A JP22411994 A JP 22411994A JP H0862978 A JPH0862978 A JP H0862978A
- Authority
- JP
- Japan
- Prior art keywords
- developing roller
- seal member
- toner
- developing
- developing device
- 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- Withdrawn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
- Dry Development In Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、複写機、ファクシミ
リ、プリンター等の画像形成装置に係り、詳しくは乾式
のトナーを用いて潜像担持体の潜像を顕像化する画像形
成装置の現像装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a copying machine, a facsimile and a printer, and more particularly, to development of an image forming apparatus which visualizes a latent image on a latent image carrier using dry toner. It relates to the device.
【０００２】[0002]
【従来の技術】従来乾式のトナーを用いる静電式画像形
成装置の現像装置においては、トナーを搬送しながら回
転する現像ローラ及び該現像ローラと感光体ドラムが対
向する部分（以下、現像ニップという）で、浮遊するト
ナーが現像装置外へ飛散し、以下のような不具合が生じ
る。 機内を汚染したトナーにより、見栄えが悪くなるばか
りでなく、オペレータ、作業者の手や衣服を汚してしま
う。 現像装置の前工程にある帯電装置を汚し、感光体ドラ
ムへの帯電ムラによる異常画像を発生させる。 感光体ドラムに潜像を形成する光学系ミラーや防塵ガ
ラスにトナーが堆積すると、その部分で正規の潜像形成
が行われず異常画像となる。 上記不具合を防止する代表的な手段として、現像ローラ
とその上方空間とを遮蔽するために現像ニップを覆い、
感光体ドラムに摺接するシール部材を設けている。この
種の現像装置としては、感光体ドラムに対向する現像装
置の現像用開口部の上縁部に感光体ドラムに摺接するシ
ール部材を設け、シール部材と帯電チャージャなどが設
けられた帯電部との間に、浮遊現像剤を帯電部から離れ
た開放区間へと案内するガイド板を設け、開放空間には
現像剤の溜り部を設けるものが知られている（例えば、
実開昭６１−３４１５７号公報参照）。2. Description of the Related Art In a conventional developing device of an electrostatic image forming apparatus using dry toner, a developing roller rotating while conveying toner and a portion where the developing roller and a photosensitive drum face each other (hereinafter referred to as a developing nip). ), The floating toner is scattered to the outside of the developing device, and the following problems occur. The toner that contaminates the inside of the machine not only makes it look bad, but also stains the hands and clothes of the operator and the worker. The charging device in the previous process of the developing device is soiled, and an abnormal image is generated due to uneven charging on the photosensitive drum. When the toner is deposited on the optical system mirror that forms a latent image on the photosensitive drum or the dust-proof glass, a normal latent image is not formed on that portion, resulting in an abnormal image. As a typical means for preventing the above problem, the developing nip is covered to shield the developing roller and the space above it,
A seal member is provided that is in sliding contact with the photosensitive drum. As a developing device of this type, a seal member that is in sliding contact with the photosensitive drum is provided at the upper edge of the developing opening of the developing device that faces the photosensitive drum, and a charging unit that includes the seal member and a charger is provided. It is known that a guide plate that guides the floating developer to an open section apart from the charging section is provided between the two, and a developer pool is provided in the open space (for example,
(See Japanese Utility Model Laid-Open No. 61-34157).
【０００３】[0003]
【発明が解決しようとする課題】ところが上記構成にお
いては、シール部材と感光体ドラムとの接触を安定かつ
均一に保つことが難しく、トナー飛散を完全に抑えるに
は至っていない。また、現像装置外へ直接浮遊して出て
いくトナーによって上述した種々の不具合を生じるとい
う問題がある。現像剤層厚規制部材から現像ニップまで
の領域において、カバーと現像ローラとの間隔が広かっ
たり、少しでも凹凸があると、現像ローラから浮遊した
トナーがカバーの内壁に堆積してトナー溜りとなる。そ
して溜ったトナーは経時で、あるいは画像形成中の何ら
かの衝撃により、塊の状態で現像ローラ上に落下する。
このトナー塊は感光体ドラムの画像形成領域に付着して
画像上の汚れとなったり、現像領域を通過後、現像装置
の下部に落下し転写紙の搬送経路近辺に堆積したりし
て、いずれは転写紙を汚すなどの不具合を生じる恐れが
ある。However, in the above structure, it is difficult to keep the contact between the seal member and the photosensitive drum stable and uniform, and the toner scattering has not been completely suppressed. Further, there is a problem that the above-mentioned various problems are caused by the toner floating directly out of the developing device. In the area from the developer layer thickness control member to the developing nip, if the distance between the cover and the developing roller is wide or there is even unevenness, the toner floating from the developing roller accumulates on the inner wall of the cover and becomes a toner pool. . The accumulated toner drops on the developing roller in a lump state with the passage of time or due to some impact during image formation.
This toner lump adheres to the image forming area of the photoconductor drum and becomes a stain on the image, or after passing through the developing area, drops to the lower part of the developing device and accumulates near the transfer paper transport path. May cause problems such as soiling the transfer paper.
【０００４】上記従来技術（実開昭６１−３４１５７
号）では、シール部材と帯電チャージャなどが設けられ
た帯電部との間に、シール部材から飛散した浮遊トナー
を帯電部から離れた開放空間へと案内するガイド板を設
け、更に開放空間にはトナーの溜り部を設けることで、
シール部材からトナーが飛散しても帯電装置を汚染させ
ないようにしている。しかし、この従来技術では、現像
ローラ上方空間への汚染は防止しているが、ガイド板と
いう大きな別部品を設けることでコストアップにつなが
るという問題点があった。[0004] The above-mentioned conventional technique (Shokai 61-34157)
No.), a guide plate for guiding the floating toner scattered from the seal member to an open space separated from the charging unit is provided between the seal member and the charging unit provided with a charger, and the open space is further provided. By providing a toner reservoir,
Even if toner is scattered from the seal member, the charging device is prevented from being contaminated. However, in this conventional technique, although the space above the developing roller is prevented from being contaminated, there is a problem in that the cost is increased by providing a large separate component such as a guide plate.
【０００５】本発明は以上の問題点に鑑みなされたもの
であり、その第一の目的とするところは、現像剤層厚規
制部材から現像ニップまでの領域で、浮遊トナーによる
トナー溜りの発生をなくし、画像上の汚れや装置外への
トナー汚染を防止する現像装置を提供することであり、
また、第二の目的とするところは、装置外へのトナーの
飛散を防止するとともに、組付けの簡略化及びコストダ
ウンを図った現像装置を提供することである。The present invention has been made in view of the above problems, and its first object is to prevent toner accumulation due to floating toner in the area from the developer layer thickness regulating member to the developing nip. The purpose of the present invention is to provide a developing device that eliminates stains on an image and prevents toner contamination outside the device.
A second object is to provide a developing device which prevents the toner from scattering outside the device and simplifies the assembly and reduces the cost.
【０００６】[0006]
【課題を解決するための手段】上記第一の目的を達成す
るために、請求項１の現像装置は、現像剤層厚規制部材
から現像ローラと感光体ドラムとの対向部までの現像ロ
ーラ上を覆い、かつ現像ローラに対向する面が、現像ロ
ーラ表面と一定の間隔を保った曲面となるように形成し
たカバーと、該カバーの感光体ドラムに対向する面に該
感光体ドラムに摺接するシール部材とを設け、該曲面に
おいて該曲面から該シール部材に向かって突き出す補助
シール部材を支持したことを特徴とするものである。In order to achieve the above-mentioned first object, a developing device according to a first aspect of the invention has a developing roller from a developer layer thickness regulating member to a portion where a developing roller and a photosensitive drum face each other. And a cover formed so that the surface facing the developing roller is a curved surface with a constant distance from the developing roller surface, and the surface of the cover facing the photosensitive drum is in sliding contact with the photosensitive drum. A seal member is provided, and an auxiliary seal member projecting from the curved surface toward the seal member is supported on the curved surface.
【０００７】また、上記第二の目的を達成するために、
請求項２の現像装置は、請求項１の現像装置において、
上記感光体ドラムに摺接するシール部材と、現像ローラ
軸方向の両端部分で、現像ローラ回転方向下流側に伸び
た帯状のサイドシール部材とを一体に形成したことを特
徴とするものである。In order to achieve the above second object,
The developing device according to claim 2 is the developing device according to claim 1,
It is characterized in that a seal member slidingly contacting the photosensitive drum and a strip-shaped side seal member extending downstream in the rotation direction of the developing roller are integrally formed at both end portions in the developing roller axial direction.
【０００８】[0008]
【作用】請求項１の現像装置においては、上記現像ロー
ラを覆うように設けられたカバーが、該カバーと現像ロ
ーラとの間隔を一定に保った曲面となっているため、浮
遊トナーが該現像ローラに対向するカバー曲面に滞留す
ることがない。また、該カバーの感光体ドラムに対向す
る面に設けたシール部材は、その自由端部が感光体ドラ
ム表面に摺接するので、現像ニップから該カバーと該感
光体ドラムとの隙間を介して浮遊トナーが現像装置外へ
飛散することを防止できる。また、該カバーの現像ロー
ラ側の曲面に設けた補助シール部材は、該シール部材の
現像ロ−ラと対向する面に向かって突き出して該シール
部材を付勢しているため、該シール部材が感光体ドラム
から離れることなく密着する。そして、該シール部材と
カバーとの継ぎ目に生じる段差を該補助シール部材が覆
うので、該段差に浮遊トナーが滞留することを防止でき
る。In the developing device of the present invention, since the cover provided so as to cover the developing roller has a curved surface with a constant distance between the cover and the developing roller, the floating toner is not developed. It does not stay on the curved surface of the cover facing the roller. Further, since the seal member provided on the surface of the cover facing the photoconductor drum has its free end in sliding contact with the surface of the photoconductor drum, it floats from the developing nip through the gap between the cover and the photoconductor drum. It is possible to prevent the toner from scattering outside the developing device. Further, since the auxiliary seal member provided on the curved surface of the cover on the developing roller side projects toward the surface of the seal member facing the developing roller to bias the seal member, the seal member is Adhesion does not separate from the photoconductor drum. Then, since the auxiliary seal member covers the step generated at the joint between the seal member and the cover, it is possible to prevent the floating toner from staying at the step.
【０００９】請求項２の現像装置においては、上記現像
ローラの端部を覆うサイドシール部材をシール部材と一
体に設けるため、シール部材を別々に設けることを要し
ない。そして、サイドシール部材とシール部材とを別体
で設けたときに生じるような継ぎ目がなくなり、またサ
イドシール部材を設ける位置の管理も不要になる。In the developing device of the second aspect, since the side seal member for covering the end portion of the developing roller is provided integrally with the seal member, it is not necessary to separately provide the seal member. Then, the seam that occurs when the side seal member and the seal member are provided separately is eliminated, and the management of the position where the side seal member is provided is also unnecessary.
【００１０】[0010]
【実施例】以下、本発明を画像形成装置である電子写真
複写機（以下、複写機という）の現像装置に適用した一
実施例について説明する。図１は本実施例に係る複写機
の現像装置の概略構成図である。本実施例の現像装置に
おいては、感光体ドラム１に対向して、磁石を内設した
現像ローラ２が回動可能に支承されている。この現像ロ
ーラ２の表面と感光体ドラム１表面とは、厳しい公差精
度に保たれた所定の間隔をおいて対向するようになって
いる。この現像ローラ２を備えた現像器内において、そ
の底部には、回転駆動されるパドルホイール３が設けら
れている。また現像ローラ２の表面に所定ギャップをお
いて対向するようにドクターブレード４が設けられてい
る。また現像ローラ２表面に対向するようにセパレータ
５が設けられている。このセパレータ５上を流動するト
ナーを、現像ローラ２の軸方向に直交する方向に対して
斜行させるフィン７が複数個配列させて設けられてい
る。そして、フィン７に現像装置のトナー搬送方向上流
から搬送されたトナーを搬送しながら撹拌する撹拌スク
リュウ６が設けられている。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a developing device of an electrophotographic copying machine (hereinafter referred to as a copying machine) which is an image forming apparatus will be described below. FIG. 1 is a schematic configuration diagram of a developing device of a copying machine according to this embodiment. In the developing device of this embodiment, a developing roller 2 having a magnet therein is rotatably supported so as to face the photosensitive drum 1. The surface of the developing roller 2 and the surface of the photosensitive drum 1 are arranged to face each other with a predetermined gap maintained with strict tolerance accuracy. In the developing device provided with the developing roller 2, a paddle wheel 3 which is rotationally driven is provided at the bottom thereof. Further, a doctor blade 4 is provided so as to face the surface of the developing roller 2 with a predetermined gap. Further, a separator 5 is provided so as to face the surface of the developing roller 2. A plurality of fins 7 are arranged so that the toner flowing on the separator 5 is inclined with respect to the direction orthogonal to the axial direction of the developing roller 2. The fin 7 is provided with a stirring screw 6 that stirs the toner conveyed from upstream in the toner conveying direction of the developing device.
【００１１】以上の現像器内においては、パドルホイー
ル３の回転により現像器内底部に溜っている磁性キャリ
アとトナーとからなる二成分現像剤を撹拌するとともに
上記現像ローラ２に汲み上げて供給する。この現像剤は
パドルホイール３で現像ローラ２に供給され、かつ該現
像ローラ２の回転で現像ニップ領域に搬送される現像剤
は、ドクタブレード４により過剰な現像剤が掻き取られ
て一定量の現像剤にされた後に感光体ドラム１表面に供
給され静電潜像の現像に供される。一方、ドクタブレー
ド４で掻き取られた現像剤は、セパレータ５上を流動す
る。この流動現像剤の大部分がフィン７により現像ロー
ラ２の軸方向に直交する方向に対して斜行させられなが
ら撹拌スクリュー６へ搬送され、撹拌スクリュー６によ
り撹拌されながら現像ローラ２軸方向に搬送された後、
いわゆる横撹拌（現像ローラ軸方向）が行われ、パドル
ホイール３上に落下する。そして、パドルホイール３上
に落下した現像剤は、該パドルホイール３により撹拌さ
れた後に現像ローラ２に汲み上げられる。以後、上記の
動作が繰り返される。In the developing device, the two-component developer consisting of the magnetic carrier and the toner accumulated at the bottom of the developing device is stirred by the rotation of the paddle wheel 3 and is pumped up and supplied to the developing roller 2. This developer is supplied to the developing roller 2 by the paddle wheel 3, and the developer conveyed to the developing nip region by the rotation of the developing roller 2 is scraped off by the doctor blade 4 to remove a certain amount of developer. After being made into a developer, it is supplied to the surface of the photosensitive drum 1 and used for developing an electrostatic latent image. On the other hand, the developer scraped off by the doctor blade 4 flows on the separator 5. Most of the fluidized developer is conveyed to the stirring screw 6 while being slanted by the fins 7 with respect to the direction orthogonal to the axial direction of the developing roller 2, and is conveyed in the axial direction of the developing roller 2 while being stirred by the stirring screw 6. After being
So-called lateral agitation (in the axial direction of the developing roller) is performed, and the paddle wheel 3 is dropped. The developer dropped on the paddle wheel 3 is agitated by the paddle wheel 3 and then pumped up to the developing roller 2. After that, the above operation is repeated.
【００１２】次に、本実施例に係る現像装置に用いるカ
バー及びシール部材について説明する。現像装置内のパ
ドルホイール３からドクタブレード４までの空間は、現
像装置外に対して隙間なく密封することが比較的容易で
現像剤及びトナーの飛散は解消しやすいが、ドクタブレ
ード４通過後から現像ニップまでの領域については現像
装置上方へのトナー飛散を防止することが難しい。従
来、現像ローラ２とその空間とを遮蔽するための代表的
な手段として、現像ニップ部分を覆い感光体ドラムに摺
接するシール部材８が設けられていた。しかしながらシ
ール部材８と感光体ドラム１との接触を安定して均一に
保つことが難しく、トナーの飛散を完全に抑えるには至
っていない。Next, the cover and the seal member used in the developing device according to this embodiment will be described. The space from the paddle wheel 3 to the doctor blade 4 in the developing device is relatively easy to be sealed to the outside of the developing device without any gap, and the scattering of the developer and toner is easy to eliminate, but after passing the doctor blade 4, In the area up to the developing nip, it is difficult to prevent toner scattering above the developing device. Conventionally, as a typical means for shielding the developing roller 2 and its space, a seal member 8 which covers the developing nip portion and is in sliding contact with the photosensitive drum has been provided. However, it is difficult to keep the contact between the seal member 8 and the photosensitive drum 1 stable and uniform, and the scattering of toner has not been completely suppressed.
【００１３】そこで本実施例の現像装置では、ドクタブ
レード４から現像ニップまでの現像ローラ２上の現像剤
を覆い、現像ローラ側は現像ローラ２と一定間隔を保っ
た滑らかな曲面に形成したカバー９を設け、このカバー
９の感光体ドラム１に対向する面にシール部材８を張り
付けている。ここで通常、カバー９は所定の厚みを持っ
ているため、感光体ドラム側にシール部材８を設けたと
きにカバー９先端とシール部材８との継ぎ目（Ａ部）に
段差が生じる。この段差はカバー９の形状により小さく
することはできるが、皆無にすることは不可能であるた
め、微小な段差であっても現像ローラ２上から浮遊した
トナーが堆積し、トナー塊となって画像を汚す恐れがあ
る。そこで、現像ローラ２側の曲面にはシール部材８の
自由端部に向かって突き出す入口補助シール部材１０を
設けてこの段差を塞いでいる。なお、シール部材及び補
助シール部材の材質としては、可撓性のものを用いるこ
とが望ましい。Therefore, in the developing device of the present embodiment, the cover is formed by covering the developer on the developing roller 2 from the doctor blade 4 to the developing nip, and forming a smooth curved surface on the developing roller side with a constant distance from the developing roller 2. 9 is provided, and the seal member 8 is attached to the surface of the cover 9 facing the photosensitive drum 1. Here, since the cover 9 usually has a predetermined thickness, when the seal member 8 is provided on the photosensitive drum side, a step is formed at the joint (A portion) between the tip of the cover 9 and the seal member 8. Although this step can be made small by the shape of the cover 9, it cannot be completely eliminated. Therefore, even if the step is a minute step, the toner floating from the developing roller 2 is accumulated and becomes a toner mass. It may stain the image. Therefore, an entrance auxiliary seal member 10 that protrudes toward the free end of the seal member 8 is provided on the curved surface on the side of the developing roller 2 to close this step. In addition, it is desirable to use flexible materials as the material of the seal member and the auxiliary seal member.
【００１４】以上の構成において、本実施例の現像装置
では、カバー９の現像ローラ２に対向する曲面を滑らか
に形成しているため、ドクターブレード４から現像ニッ
プまでの領域において、該カバー９の曲面に浮遊トナー
が滞留しないので、トナー溜りの発生をなくすことがで
きる。また、シール部材８を該補助シール部材１０によ
り感光体ドラム１の方へ付勢するため、シール部材８が
感光体ドラム１から離れることなく密着するので、浮遊
トナーによる現像装置の汚染を防止することができる。In the developing device of the present embodiment having the above-described structure, the curved surface of the cover 9 facing the developing roller 2 is formed smoothly, so that the cover 9 is covered in the area from the doctor blade 4 to the developing nip. Since the floating toner does not stay on the curved surface, it is possible to eliminate the occurrence of toner accumulation. Further, since the seal member 8 is urged toward the photoconductor drum 1 by the auxiliary seal member 10, the seal member 8 is brought into close contact with the photoconductor drum 1 without being separated from the photoconductor drum 1. Therefore, contamination of the developing device by floating toner is prevented. be able to.
【００１５】以上の実施例においては、シール部材８が
感光体ドラム１に摺接する範囲についてトナー飛散を防
止していたが、これに加え、現像ローラ端部から現像装
置外へ飛散するトナーについても考慮し、図２に示すよ
うに、現像ローラ軸方向の両端部分において、この両端
部分を覆うように現像ローラ２の回転方向下流側に帯状
に形成したサイドシール部材１１をシール部材８と一体
に設けるようにしてもよい。In the above embodiments, the toner scattering is prevented in the range where the seal member 8 is in sliding contact with the photosensitive drum 1, but in addition to this, the toner scattering from the end portion of the developing roller to the outside of the developing device is also prevented. Considering this, as shown in FIG. 2, at both end portions in the axial direction of the developing roller, the side seal member 11 formed in a belt shape on the downstream side in the rotation direction of the developing roller 2 so as to cover the both end portions is integrated with the seal member 8. It may be provided.
【００１６】この実施例の現像装置においては、現像ロ
ーラ２端部をシールするサイドシール部材１１をシール
部材８と一体に設けるので、これらのシール部材を別々
に用いる場合に生ずるシール部材８とサイドシール部材
１１との継ぎ目がなくなり、サイドシール部材貼り付け
位置の管理も不要になるので、コストダウンや組付けの
簡略化が図れるとともに、現像装置外へのトナーの飛散
を解消することができる。In the developing device of this embodiment, the side seal member 11 for sealing the end portion of the developing roller 2 is provided integrally with the seal member 8. Therefore, when these seal members are used separately, the seal member 8 and the side member are formed. Since there is no joint with the seal member 11 and it is not necessary to manage the position where the side seal member is attached, the cost can be reduced and the assembling can be simplified, and the toner scattering to the outside of the developing device can be eliminated.
【００１７】なお、最近では高画質化のためにトナーの
小粒径化が図られているが、小粒径トナーは、感光体ド
ラムとクリーニングブレードとの間で凝集状態で放置さ
れることによりクリーニングブレードに固着し、その後
の画像形成動作においてクリーニング不良を生じること
がある。そのため、画像形成動作終了後に感光体ドラム
を微小距離だけ逆方向に回転させるなどの措置を採って
いる。しかし、感光体ドラムが逆方向に回転すると、現
像装置のシール部材も通常とは逆にめくられ、部分的あ
るいは全体的にでも、その状態で放置されることで折れ
グセがつくことが確認されている。このような状態では
感光体ドラムへの均一な接触が維持できなくなり、トナ
ーが飛散する恐れがある。また感光体ドラムの逆転時
に、現像ニップ部の浮遊トナーがシール部材を通過して
シール部材の上に乗ってしまうことがあり、その後の画
像形成時にシール部材と感光体ドラムに挾まれたトナー
が、感光体ドラム表面を傷つける恐れもある。Recently, the particle size of the toner has been reduced to improve the image quality. However, the small particle size toner is left in an agglomerated state between the photosensitive drum and the cleaning blade. The toner adheres to the cleaning blade, and cleaning failure may occur in the subsequent image forming operation. Therefore, measures such as rotating the photosensitive drum in the opposite direction by a small distance after the image forming operation are taken. However, when the photoconductor drum rotates in the opposite direction, the seal member of the developing device is also flipped in the opposite direction, and it is confirmed that if it is left partially or wholly, it will be bent. ing. In such a state, the uniform contact with the photosensitive drum cannot be maintained, and the toner may be scattered. Further, when the photoconductor drum is rotated in the reverse direction, the floating toner in the developing nip portion may pass through the seal member and get on the seal member, and the toner caught between the seal member and the photoconductor drum during the subsequent image formation may be removed. , The surface of the photoconductor drum may be damaged.
【００１８】そこで、上記実施例の現像装置において、
感光体ドラムに摺接するシール部材を該感光体ドラムへ
の摺接角度が接触面の接線方向に対してできるだけ小さ
く設定することが望ましい。これにより、画像形成動作
後に該感光体ドラムが微小距離だけ逆回転しても、該シ
ール部材が逆方向にめくれず折れグセがつくことがなく
なり、感光体ドラムへの均一な接触を維持でき、また現
像ニップ部の浮遊トナーがシール部材を通過してシール
部材の上に乗ってしまうことがないので、その後の画像
形成時にシール部材と感光体ドラムに挾まれたトナー
が、感光体ドラム表面を傷つける恐れがない。特に、第
二実施例の現像装置においては、感光体ドラム１に摺接
するシール部材８の感光体ドラム１への摺接角度を、接
触面の接線方向に対してできるだけ小さく設定すると、
該角度を大きく設定する場合と異なり、現像ローラ２の
回転方向下流側に帯状に形成したサイドシール部材１１
が感光体ドラム１へ摺接するときの屈曲が緩やかにな
る。これにより、シール部材８とサイドシール部材１１
との角部１２において感光体ドラム１との間に生じる隙
間が小さくなるので、該角部１２の隙間から浮遊トナー
の飛散が生じない。Therefore, in the developing device of the above embodiment,
It is desirable that the seal member that is in sliding contact with the photosensitive drum be set so that the sliding contact angle with the photosensitive drum is as small as possible with respect to the tangential direction of the contact surface. As a result, even if the photoconductor drum reversely rotates by a small distance after the image forming operation, the seal member does not turn in the opposite direction and is not bent and the uniform contact with the photoconductor drum can be maintained. Further, since the floating toner in the developing nip portion does not pass through the seal member and ride on the seal member, the toner caught between the seal member and the photoconductor drum during the subsequent image formation may not contact the surface of the photoconductor drum. There is no fear of hurt. Particularly, in the developing device of the second embodiment, if the sliding contact angle of the seal member 8 slidingly contacting the photosensitive drum 1 with respect to the photosensitive drum 1 is set as small as possible with respect to the tangential direction of the contact surface,
Unlike the case where the angle is set large, the side seal member 11 formed in a belt shape on the downstream side in the rotation direction of the developing roller 2.
Bends gently when it comes into sliding contact with the photosensitive drum 1. Thereby, the seal member 8 and the side seal member 11
Since the gap between the corner portion 12 and the photosensitive drum 1 is small, the floating toner does not scatter from the gap between the corner portions 12.
【００１９】[0019]
【発明の効果】請求項１の現像装置によれば、浮遊トナ
ーが上記現像ローラに対向するカバー曲面及び上記段差
部分などに滞留することがないので、現像ローラにトナ
ー塊が落下することによる画像上の汚れや、機内の汚染
を防止することができる。また、上記シール部材の自由
端部が感光体ドラム表面に摺接するので、現像ニップか
ら該カバーと該感光体ドラムとの隙間を介して浮遊トナ
ーが現像装置外へ飛散することを防止できる。また、補
助シール部材の自由端部がシール部材を感光体ドラムの
方へ付勢することにより、該シール部材が該感光体ドラ
ムから離れることなく密着するので、トナー飛散を確実
に防ぐことができる。According to the developing device of the first aspect, the floating toner does not stay on the curved surface of the cover facing the developing roller and the stepped portion, so that an image caused by a toner lump falling on the developing roller is formed. It is possible to prevent dirt on the top and contamination in the machine. Further, since the free end of the sealing member is in sliding contact with the surface of the photosensitive drum, it is possible to prevent the floating toner from scattering from the developing nip to the outside of the developing device through the gap between the cover and the photosensitive drum. Further, since the free end portion of the auxiliary seal member urges the seal member toward the photoconductor drum, the seal member comes into close contact with the photoconductor drum without separating from the photoconductor drum, so that toner scattering can be reliably prevented. .
【００２０】請求項２の現像装置によれば、現像ローラ
端部をシールするサイドシール部材をシール部材と一体
に設けるためシール部品を別体で設ける必要がないの
で、部品の製造及び組付けを簡略化してコストを低減す
ることができる。更に、サイドシール部材を別体で設け
る場合のようなサイドシール部材貼り付け位置の管理が
不要になり、継ぎ目からのトナー飛散も生じない。According to the developing device of the second aspect, since the side seal member for sealing the end portion of the developing roller is provided integrally with the seal member, it is not necessary to separately provide a seal component, and therefore, the production and assembly of the component are performed. It can be simplified and the cost can be reduced. Further, it becomes unnecessary to manage the position where the side seal member is attached as in the case where the side seal member is provided separately, and the toner is not scattered from the joint.
【図１】本実施例に係る電子写真複写機の現像装置の概
略構成図。FIG. 1 is a schematic configuration diagram of a developing device of an electrophotographic copying machine according to this embodiment.
【図２】本実施例にかかる現像装置に用いるシール部材
部の斜視図。FIG. 2 is a perspective view of a seal member portion used in the developing device according to the present embodiment.
１ 感光体ドラム ２ 現像ローラ ３ パドルホイール ４ ドクターブレード（現像剤層厚規制部材） ５ セパレータ現像剤 ６ 横撹拌スクリュウ ７ フィン ８ シール部材 ９ カバー １０ 補助シール部材 １１ サイドシール部材 １２ 角部 Ａ 継ぎ目 DESCRIPTION OF SYMBOLS 1 Photoconductor drum 2 Development roller 3 Paddle wheel 4 Doctor blade (developer layer thickness control member) 5 Separator developer 6 Side stirring screw 7 Fins 8 Seal member 9 Cover 10 Auxiliary seal member 11 Side seal member 12 Corner part A seam
Claims (2)
体ドラムとの対向部までの現像ローラ上を覆い、かつ現
像ローラに対向する面が、現像ローラ表面と一定の間隔
を保った曲面となるように形成したカバーと、該カバー
の感光体ドラムに対向する面に該感光体ドラムに摺接す
るシール部材とを設け、該曲面において該曲面から該シ
ール部材に向かって突き出す補助シール部材を支持した
ことを特徴とする現像装置。1. A curved surface that covers the surface of the developing roller from the developer layer thickness regulating member to the facing portion of the developing roller and the photosensitive drum, and the surface facing the developing roller has a constant distance from the surface of the developing roller. And a sealing member that is in sliding contact with the photosensitive drum on the surface of the cover facing the photosensitive drum, and an auxiliary sealing member that projects from the curved surface toward the sealing member on the curved surface is provided. A developing device characterized by being supported.
と、現像ローラ軸方向の両端部分で、現像ローラ回転方
向下流側に伸びた帯状のサイドシール部材とを一体に形
成したことを特徴とする請求項１の現像装置。2. A seal member which is in sliding contact with the photosensitive drum, and a band-shaped side seal member extending downstream in the developing roller rotation direction at both end portions in the developing roller axial direction are integrally formed. The developing device according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22411994A JPH0862978A (en) | 1994-08-24 | 1994-08-24 | Developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22411994A JPH0862978A (en) | 1994-08-24 | 1994-08-24 | Developing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0862978A true JPH0862978A (en) | 1996-03-08 |
Family
ID=16808844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22411994A Withdrawn JPH0862978A (en) | 1994-08-24 | 1994-08-24 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0862978A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012088569A (en) * | 2010-10-20 | 2012-05-10 | Fuji Xerox Co Ltd | Image forming apparatus |
-
1994
- 1994-08-24 JP JP22411994A patent/JPH0862978A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012088569A (en) * | 2010-10-20 | 2012-05-10 | Fuji Xerox Co Ltd | Image forming apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20011106 |