JPH05210307A - Magnetic brush developing device - Google Patents

Magnetic brush developing device

Info

Publication number
JPH05210307A
JPH05210307A JP1536092A JP1536092A JPH05210307A JP H05210307 A JPH05210307 A JP H05210307A JP 1536092 A JP1536092 A JP 1536092A JP 1536092 A JP1536092 A JP 1536092A JP H05210307 A JPH05210307 A JP H05210307A
Authority
JP
Japan
Prior art keywords
developer
developing
layer thickness
roll
regulating member
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
Application number
JP1536092A
Other languages
Japanese (ja)
Other versions
JP3006255B2 (en
Inventor
Noriyoshi Nagamine
紀好 長峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuji Xerox Co Ltd filed Critical Fuji Xerox Co Ltd
Priority to JP4015360A priority Critical patent/JP3006255B2/en
Publication of JPH05210307A publication Critical patent/JPH05210307A/en
Application granted granted Critical
Publication of JP3006255B2 publication Critical patent/JP3006255B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Magnetic Brush Developing In Electrophotography (AREA)

Abstract

PURPOSE:To facilitate the adjustment of a layer thickness regulating member, to prevent the deformation and the adhesion of toner from occurring and to prevent developer from dropping from both end parts of a developing roll after developing an electrostatic latent image by simple constitution by providing an elastic member which abuts on both ends of a sleeve equivalent to the outside of an image area at both ends of the layer thickness regulating member. CONSTITUTION:A developing roll 46 is provided with a fixed magnet 71 in which plural magnetic poles are formed, and a cylindrical sleeve 72 consisting of a non-magnetic substance which is provided so as to rotate around the magnet 71. The developer carried by a developer carrying roll is supplied to the developing roll 46, and is regulated by a layer thickness regulating member 48 to have specified layer thickness, that means, so that a thin layer may be formed in the center part as in the conventional manner. Since an elastic member 73 attached to the member 48 is pressed at both end parts 46a equivalent to the outside of the image area of the roll 46 by elasticity, the layer thickness of the developer becomes almost zero and the developer is not carried.

Description

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

【0001】[0001]

【産業上の利用分野】本発明は、感光体等の静電潜像保
持体上の静電潜像を現像する磁気ブラシ現像装置に関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic brush developing device for developing an electrostatic latent image on an electrostatic latent image carrier such as a photoconductor.

【0002】[0002]

【従来の技術】従来より、複写機やレーザプリンタ等、
電子写真法等により感光体上に形成された静電潜像を現
像する現像装置を用いた画像形成装置が実用化されてい
る。この画像形成装置における現像方法の一つに磁気ブ
ラシ現像方法がある。この磁気ブラシ現像方法は、磁性
キャリアおよびトナーからなる二成分現像剤を使用し
て、固定磁石の回りで非磁性スリーブを回転させること
により、スリーブ上で現像剤を搬送し、ブラシ状に穂立
ちした現像剤を静電潜像の形成された感光体に接触させ
ることによりこれを現像する現像方法である。この磁気
ブラシ現像方法では、例えば特開昭58−121053
号公報に示されるように、通常、スリーブ上に付着した
現像剤の層厚を規制するための規制部材(トリマーバ
ー)が設けられている。
2. Description of the Related Art Conventionally, copying machines, laser printers, etc.
An image forming apparatus using a developing device for developing an electrostatic latent image formed on a photoconductor by an electrophotographic method or the like has been put into practical use. A magnetic brush developing method is one of the developing methods in this image forming apparatus. This magnetic brush development method uses a two-component developer consisting of a magnetic carrier and toner, and rotates the non-magnetic sleeve around a fixed magnet to convey the developer on the sleeve and to make a brush-like spike. This is a developing method of developing the developer by bringing the developer into contact with the photoconductor on which the electrostatic latent image is formed. In this magnetic brush developing method, for example, Japanese Patent Laid-Open No. 58-121053
As shown in Japanese Patent Laid-Open Publication No. 2003-242242, a regulating member (trimmer bar) for regulating the layer thickness of the developer adhering to the sleeve is usually provided.

【0003】図6に従来の磁気ブラシ現像装置の一例を
示す。この図において、セレン等で形成された感光ドラ
ム110に対向するように現像装置112が設けられて
いる。感光ドラム110は、所定極性(例えばセレンド
ラムの場合に正極性)の静電潜像が形成されて、図の矢
印方向に回転駆動される。現像装置112は、磁性キャ
リアおよびトナーからなる二成分現像剤を使用する現像
装置であり、導電性のハウジング114内に各構成部分
が収容されており、導電性ハウジング114は電気的に
浮いている。
FIG. 6 shows an example of a conventional magnetic brush developing device. In this figure, a developing device 112 is provided so as to face the photosensitive drum 110 formed of selenium or the like. On the photosensitive drum 110, an electrostatic latent image having a predetermined polarity (for example, a positive polarity in the case of a selenium drum) is formed, and the photosensitive drum 110 is rotationally driven in the arrow direction in the figure. The developing device 112 is a developing device that uses a two-component developer including a magnetic carrier and toner, and each component is housed in a conductive housing 114, and the conductive housing 114 is electrically floating. ..

【0004】ハウジング114内の上部には、トナーを
現像装置内に所定量づつ供給するトナー供給装置116
が設けられている。トナー供給装置116の下方にはブ
レンダ(混合器)118が、矢印A方向に回転駆動され
るように設けられており、新たに供給されたトナーを現
像装置内のキャリアとトナーとからなる現像剤に混合す
る作用をする。また、ハウジング114内には、感光ド
ラム110に対向する位置に、現像ロール122が設け
られ、この現像ロール122とブレンダ118の間に
は、現像剤搬送ロール(パドル)120が設けられ、矢
印B方向に回転されて現像剤を現像ロール122方向に
搬送するようになっている。
At the upper part of the housing 114, a toner supply device 116 for supplying a predetermined amount of toner into the developing device.
Is provided. Below the toner supply device 116, a blender (mixer) 118 is provided so as to be rotationally driven in the direction of arrow A, and the newly supplied toner is used as a developer consisting of the carrier and toner in the developing device. Acts to mix with. A developing roll 122 is provided inside the housing 114 at a position facing the photosensitive drum 110, and a developer transporting roll (paddle) 120 is provided between the developing roll 122 and the blender 118. The developer is conveyed in the direction of the developing roll 122 by being rotated in the direction.

【0005】現像ロール122は周知のように、複数の
磁極が形成された固定磁石の回りで非磁性体スリーブが
図の矢印C方向に回転駆動される構造のものである。現
像ロール122には図示しないバイアス手段により、現
像バイアスが印加されており、例えば感光ドラム110
上の静電潜像が正極性の場合には、正極性のバイアス電
圧(例えば300V)が印加されている。現像ロール1
22の上方には、現像ロール122上に付着した現像剤
の層厚を規制する規制部材(トリマーバー)124が設
けられ、この規制部材124により現像ロール122上
から掻き落とされた現像剤は、リバースプレート126
により案内されてブレンダ118方向に搬送される。
As well known, the developing roller 122 has a structure in which a non-magnetic sleeve is driven to rotate in the direction of arrow C in the figure around a fixed magnet having a plurality of magnetic poles. A developing bias is applied to the developing roll 122 by a biasing device (not shown), and for example, the photosensitive drum 110
When the upper electrostatic latent image has a positive polarity, a positive bias voltage (for example, 300 V) is applied. Developing roll 1
A regulating member (trimmer bar) 124 that regulates the layer thickness of the developer adhering to the developing roll 122 is provided above 22. The developer scraped off the developing roll 122 by the regulating member 124 is Reverse plate 126
And is conveyed in the direction of the blender 118.

【0006】[0006]

【発明が解決しようとする課題】ところで、上述したよ
うな構成の磁気ブラシ現像装置では、現像ロール122
上の現像剤薄層により感光ドラム110上の静電潜像を
現像した後に、図6で矢印Dで示すように現像剤の落下
が起こる。この現象は、特に現像ロール122の両端部
近傍において顕著である。これは、固定磁石により現像
ロール122のスリーブ上に付着した現像剤が規制部材
124により軸方向に引き伸ばされて現像剤の穂立ちが
形成されるが、現像ロール122の両端部では固定磁石
端部から先で発生する磁力のだれにより磁力が弱いた
め、現像剤をスリーブ上に保持しきれずに、感光ドラム
110上の静電潜像を現像した後に、現像ロール122
から現像剤が落ちてしまうためである。このため従来の
磁気ブラシ現像装置においては、落下した現像剤を回収
するためのブロアを利用した回収機構を設けるか、ある
いはただ単に落下現像剤受けを複写機内に設置してい
た。しかし、回収機構を設ける現像装置は構成が複雑に
なるという問題があり、一方、落下現像剤受けを設置し
ただけでは、現像ロールから落下した現像剤中のトナー
により複写機内を汚染してしまうという問題があった。
By the way, in the magnetic brush developing device having the above-mentioned structure, the developing roll 122 is used.
After the electrostatic latent image on the photosensitive drum 110 is developed by the upper developer thin layer, the developer falls as shown by an arrow D in FIG. This phenomenon is particularly remarkable in the vicinity of both ends of the developing roll 122. This is because the developer attached to the sleeve of the developing roll 122 by the fixed magnet is stretched in the axial direction by the regulating member 124 to form the spikes of the developer, but at both ends of the developing roll 122, the fixed magnet end portions are formed. Since the magnetic force is weak due to the sag of the magnetic force generated at the end of the developing roller, the developer cannot be held on the sleeve, and after the electrostatic latent image on the photosensitive drum 110 is developed, the developing roll 122
This is because the developer falls off from it. Therefore, in the conventional magnetic brush developing device, a collecting mechanism using a blower for collecting the dropped developer is provided, or a falling developer receiver is simply installed in the copying machine. However, there is a problem that the structure of the developing device provided with the recovery mechanism is complicated, and on the other hand, if the dropping developer receiver is installed, the toner inside the developer dropped from the developing roll will contaminate the inside of the copying machine. There was a problem.

【0007】これに対処するに、実開昭64−4336
6号公報には、層厚規制部材の両端部に突出部分を設
け、簡単な構成で、静電潜像現像後における現像ロール
の両端部分からの現像剤の落下を防止するようにした磁
気ブラシ現像装置が示されている。
[0007] To deal with this, the actual exploitation 64-4336
No. 6 discloses a magnetic brush having protrusions at both end portions of a layer thickness regulating member so as to prevent the developer from dropping from both end portions of a developing roll after electrostatic latent image development with a simple structure. A developing device is shown.

【0008】しかしながら、この方式を実現する際に
は、事実上、層厚規制部材の両端部分と現像ロールの
間、および層厚規制部材の他の部分と現像ロールの間の
間隔調整をそれぞれ行う必要がある。比較的狭巾の画像
を扱う装置であれば問題はないが、広巾(例えばA1サ
イズ、594mmを超えるような巾)の場合には、層厚
規制部材のねじれ等の公差を考慮すると、調整が非常に
厳しくなり、調整工数がかかるという問題がある。
However, when this method is realized, the gap between the both ends of the layer thickness regulating member and the developing roll and the distance between the other portion of the layer thickness regulating member and the developing roll are actually adjusted. There is a need. There is no problem as long as it is an apparatus that handles images with a relatively narrow width, but in the case of a wide width (for example, A1 size, width exceeding 594 mm), adjustment can be made by considering the tolerance such as twist of the layer thickness regulating member. There is a problem that it becomes extremely strict and adjustment man-hours are required.

【0009】また、現像ロールの両端部を覆うハウジン
グの内側に現像剤が入り込むと、その中で現像剤が固ま
ってしまうことがあるので、従来より、現像ロールの両
端部を覆うハウジングの内面にフェルト等を植毛して、
ハウジングの内側に現像剤が入り込まないようにしてい
た。しかしながら、それでも、ハウジングの内側に現像
剤が入り込んでしまい、中で凝集、固着してしまうこと
があった。
Further, when the developer enters the inside of the housing that covers both ends of the developing roll, the developer may harden in the housing. Flock felt etc.,
The developer was prevented from getting inside the housing. However, even then, the developer may enter the inside of the housing and may be agglomerated and fixed therein.

【0010】これに対処するに、特開昭63−4648
2号公報には、現像ロールの両端部における現像剤の流
れを規制する手段を設け、現像剤のつまりやこぼれ等を
防止するようにした現像装置が示されている。この現像
装置では、図7に示すように、現像ロール131を支持
するフレーム132に、現像ロール131の両端部分を
覆う規制部133を設けている。しかしながら、この規
制部133と現像ロール131との間には隙間があるの
で、現像剤をまき込んでしまう。また、図7におけるE
部を拡大した図8に示すように、規制部133は現像剤
を中央部に寄せる形状となっているため、かえって現像
剤搬送力を多く受ける。この現像剤搬送力は、図9にお
いて矢印の長さで示すように中央側寄りで最も大きくな
る。図10に示すように、規制部133と現像ロール1
31との間を現像剤が流れる間、現像剤は面で摩擦を受
け、発熱する。その結果、程度の差はあるが、現像剤の
トナーの変形、溶解による凝集、固着は、従来のフェル
ト等を設けた場合と同様に発生する。
To deal with this, Japanese Patent Laid-Open No. 63-4648 has been proposed.
Japanese Unexamined Patent Publication No. 2 (1993) discloses a developing device in which a means for restricting the flow of the developer at both ends of the developing roll is provided to prevent the developer from being blocked or spilled. In this developing device, as shown in FIG. 7, the frame 132 supporting the developing roll 131 is provided with the regulating portion 133 that covers both end portions of the developing roll 131. However, since there is a gap between the regulation portion 133 and the developing roll 131, the developer is sprinkled. In addition, E in FIG.
As shown in FIG. 8 in which the portion is enlarged, since the regulating portion 133 has a shape that brings the developer closer to the central portion, it receives a large amount of developer conveying force. This developer transporting force is greatest near the center side as shown by the length of the arrow in FIG. As shown in FIG. 10, the regulating unit 133 and the developing roll 1
While the developer flows to and from 31, the developer receives friction on the surface and generates heat. As a result, although different in degree, the toner of the developer is deformed, aggregated due to dissolution, and fixed, similarly to the case where a conventional felt or the like is provided.

【0011】そこで本発明の目的は、層厚規制部材の調
整が容易で、かつトナーの変形や固着が発生することな
く、簡単な構成で、静電潜像現像後における現像ロール
の両端部分からの現像剤の落下を防止するようにした磁
気ブラシ現像装置を提供することにある。
Therefore, an object of the present invention is to adjust the layer thickness regulating member easily, without causing deformation or sticking of toner, and with a simple structure, from both end portions of the developing roll after electrostatic latent image development. Another object of the present invention is to provide a magnetic brush developing device capable of preventing the developer from falling.

【0012】[0012]

【課題を解決するための手段】本発明の磁気ブラシ現像
装置は、固定磁石と、この固定磁石の回りに回転可能に
設けられ、固定磁石の磁力により現像剤を表面に付着さ
せて静電潜像保持体へ搬送する円筒状のスリーブと、こ
のスリーブ上に付着した現像剤の層厚を規制する規制部
材と、この規制部材の両端部に設けられ、画像領域外に
相当するスリーブの両端部に当接する弾性部材とを備え
たものである。
SUMMARY OF THE INVENTION A magnetic brush developing device of the present invention is provided with a fixed magnet and rotatably around the fixed magnet, and the magnetic force of the fixed magnet causes the developer to adhere to the surface of the electrostatic latent image. A cylindrical sleeve that conveys to the image carrier, a regulating member that regulates the layer thickness of the developer adhering to the sleeve, and both ends of the sleeve that are provided at both ends of the regulating member and that correspond to outside the image area. And an elastic member that abuts against.

【0013】この磁気ブラシ現像装置では、現像剤は、
固定磁石の磁力によりスリーブの表面に付着され、静電
潜像保持体へ搬送される。その際、規制部材により、ス
リーブ上に付着した現像剤の層厚が規制されるが、スリ
ーブの両端部では弾性部材が当接しているため、現像剤
は静電潜像保持体へ搬送されない。これにより、磁力の
弱いスリーブの両端部でも、静電潜像現像後にスリーブ
から現像剤が落下することがなくなる。
In this magnetic brush developing device, the developer is
It is attached to the surface of the sleeve by the magnetic force of the fixed magnet and is conveyed to the electrostatic latent image holder. At that time, the layer thickness of the developer adhered on the sleeve is regulated by the regulation member, but the developer is not conveyed to the electrostatic latent image holding member because the elastic members are in contact with both ends of the sleeve. As a result, the developer does not drop from the sleeve even after the development of the electrostatic latent image even at both ends of the sleeve having a weak magnetic force.

【0014】[0014]

【実施例】以下、図面を参照して本発明の実施例につい
て説明する。図1ないし図5は本発明の一実施例に係る
ものである。
Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 relate to an embodiment of the present invention.

【0015】図5は本実施例の磁気ブラシ現像装置およ
び感光体の近傍を示す説明図である。この図に示すよう
に、静電潜像保持体としての感光体11の上方には、原
稿35に光を照射する露光装置36と、この露光装置3
6によって光が照射された原稿35の像を感光体11の
表面に結像する結像装置37が設けられている。また、
感光体11の周囲には、図中矢印で示す感光体11の回
転方向に沿って順に、本実施例の現像装置40、転写前
コロトロン41、転写コロトロン31、剥離コロトロン
32、清掃前コロトロン42、清掃装置43および帯電
器44が、それぞれ感光体11に対向するように配設さ
れている。
FIG. 5 is an explanatory view showing the vicinity of the magnetic brush developing device and the photoconductor of this embodiment. As shown in this figure, an exposure device 36 that irradiates the original 35 with light is provided above the photoconductor 11 serving as an electrostatic latent image holder, and the exposure device 3 is provided.
An image forming device 37 is provided for forming an image of the document 35 illuminated by light 6 on the surface of the photoconductor 11. Also,
Around the photoconductor 11, the developing device 40 of this embodiment, the pre-transfer corotron 41, the transfer corotron 31, the peeling corotron 32, the pre-cleaning corotron 42, in order along the rotation direction of the photoconductor 11 indicated by the arrow in the figure. The cleaning device 43 and the charger 44 are arranged so as to face the photoconductor 11.

【0016】原稿35は原稿搬送ロール12により矢印
a方向に搬送され、露光装置36により光が照射され、
結像装置37により原稿像が感光体11表面に結像され
る。この感光体11は帯電器44により所定の極性に帯
電されており、原稿35からの反射光を受けて感光体1
1上に原稿像に対応する静電潜像が形成される。この静
電潜像は、感光体11の回転に伴い現像装置40の現像
部40aまで移動し、現像装置40は図示しないトナー
を静電潜像に付着させてこの静電潜像を顕像化する。顕
像化されて形成されたトナー像は、転写前コロトロン4
1を経て転写コロトロン31によって用紙に転写され
る。このようして原稿像が記録された用紙は、剥離コロ
トロン32によって感光体11より剥離され、定着器に
より像が定着され、図示しない用紙搬送路を経て排出さ
れる。一方、用紙に転写されずに感光体11に残ったト
ナーは、清掃前コロトロン42を経て、清掃装置43の
クリーナブレード43aによって感光体11表面からか
き落とされ、図示しないトナー回収ボトルに収容され
る。
The original 35 is conveyed in the direction of arrow a by the original conveying roll 12 and irradiated with light by the exposure device 36.
An image of the original is formed on the surface of the photoconductor 11 by the image forming device 37. The photoconductor 11 is charged to a predetermined polarity by the charger 44 and receives the reflected light from the original 35 to receive the photoconductor 1.
An electrostatic latent image corresponding to the original image is formed on the surface 1. This electrostatic latent image moves to the developing section 40a of the developing device 40 as the photoreceptor 11 rotates, and the developing device 40 attaches toner (not shown) to the electrostatic latent image to visualize the electrostatic latent image. To do. The toner image formed by visualization is the pre-transfer corotron 4
After that, the image is transferred to the sheet by the transfer corotron 31. The sheet on which the original image is recorded in this manner is peeled from the photoconductor 11 by the peeling corotron 32, the image is fixed by the fixing device, and the sheet is discharged through a sheet conveying path (not shown). On the other hand, the toner remaining on the photoconductor 11 without being transferred to the sheet passes through the pre-cleaning corotron 42, is scraped off the surface of the photoconductor 11 by the cleaner blade 43a of the cleaning device 43, and is stored in a toner recovery bottle (not shown). .

【0017】次に、現像装置40とトナー供給装置につ
いて説明する。現像装置40には、この現像装置40に
トナーを供給するトナー供給装置50が一体的に組み付
けられている。また、トナー供給装置50の上部には、
トナー補給部61を介してトナーカートリッジ62が設
けられている。トナー補給部61は、トナーカートリッ
ジ62内のトナーを自重で落下させトナー供給装置50
へ送る前にトナーを一時的に溜めるものである。
Next, the developing device 40 and the toner supply device will be described. A toner supply device 50 that supplies toner to the developing device 40 is integrally assembled to the developing device 40. Further, on the upper part of the toner supply device 50,
A toner cartridge 62 is provided via the toner supply unit 61. The toner replenishing unit 61 drops the toner in the toner cartridge 62 by its own weight and causes the toner supplying device 50 to drop.
The toner is temporarily stored before being sent to.

【0018】現像装置40は、電気的に浮いている導電
性のハウジング40bを有し、この導電性ハウジング4
0b内には、トナー供給装置50の下方に配設されたブ
レンダ(混合器)45と、感光体11に対向する位置に
配設された現像ロール46と、この現像ロール46に現
像剤を搬送する現像剤搬送ロール(パドル)47とが設
けられている。ブレンダ45、現像ロール46、現像剤
搬送ロール47はそれぞれ図中の矢印方向に回転するよ
うになっている。また、現像ロール46の上方には現像
ロール46上に付着した現像剤の層厚を規制する層厚規
制部材(トリマーバー)48が設けられ、現像剤搬送ロ
ール47の上方には現像剤を現像ロール46側よりブレ
ンダ45側へ戻すためのリバースプレート49が設けら
れている。現像ロール46には図示しないバイアス手段
により、現像バイアスが印加されており、例えば感光体
11上の静電潜像が正極性の場合には、正極性のバイア
ス電圧が印加されている。
The developing device 40 has a conductive housing 40b which is electrically floating.
In FIG. 0b, a blender (mixer) 45 disposed below the toner supply device 50, a developing roll 46 disposed at a position facing the photoconductor 11, and a developer are conveyed to the developing roll 46. And a developer transporting roll (paddle) 47 which is provided. The blender 45, the developing roll 46, and the developer transporting roll 47 are adapted to rotate in the directions of the arrows in the figure. A layer thickness regulating member (trimmer bar) 48 for regulating the layer thickness of the developer adhered on the developing roll 46 is provided above the developing roll 46, and the developer is developed above the developer transporting roll 47. A reverse plate 49 for returning from the roll 46 side to the blender 45 side is provided. A developing bias is applied to the developing roll 46 by a bias means (not shown). For example, when the electrostatic latent image on the photoconductor 11 has a positive polarity, a positive bias voltage is applied.

【0019】この現像装置40内には図示しない磁性キ
ャリアが収容されており、このキャリアとトナー供給装
置50から供給されるトナーとがブレンダ45によって
攪拌混合されて現像剤となる。この現像剤は、現像剤搬
送ロール47によって現像ロール46側に搬送され、層
厚規制部材48による層厚規制を受け、ブラシ状に穂立
ちして、現像部40aにおいて、現像ロール46によっ
て感光体11上の静電潜像に付着される。
A magnetic carrier (not shown) is accommodated in the developing device 40, and the carrier and the toner supplied from the toner supplying device 50 are agitated and mixed by the blender 45 to form a developer. This developer is conveyed to the developing roll 46 side by the developer conveying roll 47, is subjected to the layer thickness regulation by the layer thickness regulating member 48, and stands up like a brush, and is developed by the developing roll 46 in the developing section 40a. 11 is attached to the electrostatic latent image.

【0020】トナー供給装置50は、ハウジングの底部
に、ブレンダ45の回転軸方向に沿った開口部52が形
成され、この開口部52に、板に多数の孔を形成してな
る図示しない孔付部材が取り付けられている。この孔付
部材の上部には発泡部材ロール54が配設され、その上
方には、仕切り部を挟んで2つのスクリュ55、56が
配設されている。トナーカートリッジ62に保持された
トナーは、重力によりトナー補給部61を経てトナー供
給装置50に落下し、互いに逆方向に回転するスクリュ
55、56によって循環され、発泡部材ロール54上に
略均等に落下し、この発泡部材ロール54に付着する。
発泡部材ロール54は、付着したトナーを孔付部材にこ
すりつけてトナーを落下させて、現像装置40に供給す
る。
In the toner supply device 50, an opening 52 is formed at the bottom of the housing along the rotational axis direction of the blender 45, and a large number of holes are formed in the plate at the opening 52 to form a hole (not shown). The member is attached. A foaming member roll 54 is arranged above the perforated member, and two screws 55 and 56 are arranged above the foaming member roll 54 with the partitioning portion interposed therebetween. The toner held in the toner cartridge 62 drops by gravity to the toner supply device 50 via the toner replenishing section 61, is circulated by the screws 55 and 56 rotating in opposite directions, and drops substantially evenly on the foaming member roll 54. Then, it adheres to the foam member roll 54.
The foam member roll 54 rubs the adhered toner on the perforated member to drop the toner, and supplies the toner to the developing device 40.

【0021】図1は現像ロールおよび層厚規制部材を示
す正面図である。この図に示すように、現像ロール46
は、複数の磁極が形成された固定磁石71と、この固定
磁石の回りに回転可能に設けられた非磁性体からなる円
筒状のスリーブ72とを備えている。図1に示すよう
に、現像ロール46の両端部分46aには固定磁石71
は配置されていない。さらに、現像ロール46の両端部
分46aは、現像装置40のハウジング40b内に僅か
ばかり挿入されて、現像ロール46のスリーブ72が回
転駆動されるようになっている。
FIG. 1 is a front view showing a developing roll and a layer thickness regulating member. As shown in this figure, the developing roll 46
Includes a fixed magnet 71 having a plurality of magnetic poles formed therein, and a cylindrical sleeve 72 made of a non-magnetic material and rotatably provided around the fixed magnet. As shown in FIG. 1, fixed magnets 71 are provided on both end portions 46 a of the developing roller 46.
Is not placed. Further, both end portions 46a of the developing roll 46 are slightly inserted into the housing 40b of the developing device 40, and the sleeve 72 of the developing roll 46 is rotationally driven.

【0022】この現像ロール46に対向する層厚規制部
材48の両端部分には、画像領域外に相当する現像ロー
ル46の両端部分46aに弾性により当接する弾性部材
73が取り付けられている。本実施例では、層厚規制部
材48の中央部分48aと現像ロール46との間隙d2
は所定値、例えば約1.1mmに設定され、弾性部材7
3と現像ロール46との間隙d1 は事実上ゼロである。
At both end portions of the layer thickness regulating member 48 facing the developing roll 46, elastic members 73 which are elastically brought into contact with both end portions 46a of the developing roll 46 outside the image area are attached. In this embodiment, the gap d 2 between the central portion 48a of the layer thickness regulating member 48 and the developing roller 46 is set.
Is set to a predetermined value, for example, about 1.1 mm, and the elastic member 7
The gap d 1 between the developing roller 46 and the developing roller 46 is practically zero.

【0023】図2は層厚規制部材48によって現像ロー
ル46上の現像剤の層厚が規制される様子を示す斜視図
である。この図に示すように、現像剤搬送ロール47で
搬送された現像剤は、現像ロール46に供給され、層厚
規制部材48により所定の層厚、すなわち中央部分では
従来通りの薄層に規制される。
FIG. 2 is a perspective view showing how the layer thickness of the developer on the developing roll 46 is regulated by the layer thickness regulating member 48. As shown in this figure, the developer conveyed by the developer conveying roll 47 is supplied to the developing roll 46 and regulated to a predetermined layer thickness by the layer thickness regulating member 48, that is, a conventional thin layer in the central portion. It

【0024】これに対し、現像ロール46の画像領域外
に相当する両端部分46aでは、層厚規制部材48に取
り付けた弾性部材73が弾性により押し付けられている
ので、現像剤の層厚はほとんどゼロとなり現像剤が搬送
されない。なお、弾性部材73の当接の仕方によって
は、極少量の現像剤が通過することがあるが、性能上は
問題がない。
On the other hand, at both end portions 46a corresponding to the outside of the image area of the developing roll 46, since the elastic member 73 attached to the layer thickness regulating member 48 is elastically pressed, the layer thickness of the developer is almost zero. And the developer is not conveyed. A very small amount of developer may pass through depending on how the elastic member 73 abuts, but there is no problem in performance.

【0025】図2に示すように層厚規制部材48および
弾性部材73により現像ロール46上から掻き落とされ
た現像剤76は、リバースプレート49により案内され
てブレンダ45方向に搬送される。層厚規制部材48で
層厚が規制された後には、図2に示すように現像ロール
46の中央部分には従来と同様な所定の層厚(例えば
1.1mm)の現像剤薄層75aが形成され、両端部近
傍では、弾性部材73により現像剤は搬送されないか、
あるいは極めて薄い現像剤層75bが形成される。
As shown in FIG. 2, the developer 76 scraped off the developing roll 46 by the layer thickness regulating member 48 and the elastic member 73 is guided by the reverse plate 49 and conveyed toward the blender 45. After the layer thickness is regulated by the layer thickness regulating member 48, a developer thin layer 75a having a predetermined layer thickness (for example, 1.1 mm) similar to the conventional one is formed in the central portion of the developing roll 46 as shown in FIG. If the developer is formed and the developer is not conveyed by the elastic members 73 near both ends,
Alternatively, an extremely thin developer layer 75b is formed.

【0026】なお、前述のように、現像ロール46の両
端部分46aには固定磁石71は配置されておらず、こ
の両端部分46aのうち端部に近い部分には現像剤は付
着せず、この部分が現像装置のハウジング内に挿入され
て、スリーブ72が回転される。現像ロール46の両端
部分46aのうち中央部に近い部分には固定磁石71に
よる弱い磁力により現像剤が付着するが、これは弾性部
材73により掻き落とされる。
As described above, the fixed magnet 71 is not arranged at both end portions 46a of the developing roll 46, and the developer does not adhere to the portions near the end portions of the both end portions 46a. The part is inserted into the housing of the developing device and the sleeve 72 is rotated. The developer adheres to a portion of the both ends 46a of the developing roller 46 near the central portion due to the weak magnetic force of the fixed magnet 71, which is scraped off by the elastic member 73.

【0027】このように本実施例では、層厚規制部材4
8通過後、現像ロール46の画像領域内に相当する中央
部分には現像剤が十分に付着し、現像ロール46の画像
領域外に相当する両端部分46aでは現像剤の付着がな
いか、あるいは極端に少ない。このため、現像ロール4
6の磁力が画像領域外で弱くなっていても、現像剤を十
分に保持できるため、感光体11上の静電潜像を現像後
に、現像剤が現像ロール46の両端部分46aから落下
することが防止される。
As described above, in this embodiment, the layer thickness regulating member 4 is used.
After 8 passes, the developer is sufficiently adhered to the central portion corresponding to the inside of the image area of the developing roll 46, and the developer is not attached to the both end portions 46a corresponding to the outside of the image area of the developing roll 46, or there is no extreme adherence. Very few. Therefore, the developing roll 4
Even if the magnetic force of 6 is weak outside the image area, the developer can be sufficiently retained. Therefore, after the electrostatic latent image on the photoconductor 11 is developed, the developer may drop from both end portions 46a of the developing roll 46. Is prevented.

【0028】なお、弾性部材73は例えばPET(ポリ
エチレンテレフタレート)等のシートで構成すると良好
であることを確認した。
It was confirmed that the elastic member 73 should preferably be made of a sheet such as PET (polyethylene terephthalate).

【0029】また、弾性部材73は、図3に示すように
層厚規制部材48に接着しても良いし、図4に示すよう
に、板状部材78に接着して、この板状部材78をねじ
79等により層厚規制部材48に取り付けても良い。こ
の場合、板状部材78の形状を工夫することにより、弾
性部材73の位置を、現像ロール46への当接の角度や
強さが良好に位置に設定することができる。
The elastic member 73 may be adhered to the layer thickness regulating member 48 as shown in FIG. 3 or may be adhered to the plate member 78 as shown in FIG. May be attached to the layer thickness regulating member 48 with a screw 79 or the like. In this case, by devising the shape of the plate member 78, the position of the elastic member 73 can be set to a position where the angle and strength of contact with the developing roll 46 are good.

【0030】なお、弾性部材73は、当初現像ロール4
6に対して当接しているが、いずれ磨耗して、接触する
程度になる。接触している程度だと、現像剤が通過しよ
うとする力により、弾性部材73が変形し現像剤が通過
するようになるが、すでに述べたようにその量は極めて
微少であり性能上問題はない。
Incidentally, the elastic member 73 is initially the developing roller 4
Although it is in contact with 6, it will eventually wear out and come into contact. When it is in contact, the elastic member 73 is deformed by the force that the developer tries to pass, and the developer passes through. However, as described above, the amount is extremely small and there is no problem in performance. Absent.

【0031】このように本実施例によれば、層厚規制部
材48に弾性部材73を取り付けただけの簡単な構成
で、静電潜像現像後における現像ロールの両端部分から
の現像剤の落下を防止することができる。しかも、弾性
部材73は弾性のたわみにより現像ロール46に当接す
るので、その取り付け位置は、弾性により現像ロール4
6に当接する範囲内であれば良く、層厚規制部材48の
取り付け公差は厳しくなることがない。
As described above, according to this embodiment, the developer is dropped from both end portions of the developing roller after the electrostatic latent image is developed with a simple structure in which the elastic member 73 is attached to the layer thickness regulating member 48. Can be prevented. Moreover, since the elastic member 73 abuts the developing roll 46 due to the elastic deflection, the mounting position of the elastic member 73 is the developing roll 4 due to the elasticity.
As long as it is within the range of abutting against 6, the mounting tolerance of the layer thickness regulating member 48 does not become strict.

【0032】また、弾性部材73は、層厚規制部材48
と同様に、ほとんど線で接触する。このため、従来のフ
ェルト等を用いる方式や、特開昭63−46482号公
報に示される方式のように、面で接触する方式における
ような発熱はほとんどなく、従ってトナーの変形や固
着、固形化が発生することがない。
The elastic member 73 is the layer thickness regulating member 48.
As with, almost in line contact. For this reason, there is almost no heat generation in the conventional method using a felt or the like or the method shown in Japanese Unexamined Patent Publication No. 63-46482, in which the toner is in contact with each other, and therefore the toner is deformed, fixed, or solidified. Does not occur.

【0033】[0033]

【発明の効果】以上説明したように本発明によれば、ス
リーブ上に付着した現像剤の層厚を規制する規制部材の
両端部に、画像領域外に相当するスリーブの両端部に当
接する弾性部材を設けたので、層厚規制部材の調整が容
易で、かつトナーの変形や固着が発生することなく、簡
単な構成で、静電潜像現像後における現像ロールの両端
部分からの現像剤の落下を防止することができるという
効果がある。
As described above, according to the present invention, both ends of the regulating member for regulating the layer thickness of the developer adhered on the sleeve are elastically contacted with both ends of the sleeve corresponding to the outside of the image area. Since the member is provided, the adjustment of the layer thickness regulating member is easy, and the deformation or sticking of the toner does not occur. With a simple structure, the developer from both ends of the developing roller after the electrostatic latent image development is prevented. There is an effect that it can be prevented from falling.

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

【図1】 本発明の一実施例の現像装置の現像ロールお
よび層厚規制部材を示す正面図である。
FIG. 1 is a front view illustrating a developing roll and a layer thickness regulating member of a developing device according to an exemplary embodiment of the present invention.

【図2】 図1の層厚規制部材によって現像ロール上の
現像剤の層厚が規制される様子を示す斜視図である。
FIG. 2 is a perspective view showing how the layer thickness of the developer on the developing roll is regulated by the layer thickness regulating member of FIG.

【図3】 一実施例における層厚規制部材に対する弾性
部材の取り付け方法の一例を示す斜視図である。
FIG. 3 is a perspective view showing an example of a method of attaching an elastic member to a layer thickness regulating member in one embodiment.

【図4】 一実施例における層厚規制部材に対する弾性
部材の取り付け方法の他の例を示す斜視図である。
FIG. 4 is a perspective view showing another example of a method of attaching the elastic member to the layer thickness regulating member in one embodiment.

【図5】 一実施例の現像装置および感光体の近傍を示
す説明図である。
FIG. 5 is an explanatory diagram illustrating the vicinity of a developing device and a photoconductor according to an embodiment.

【図6】 従来の磁気ブラシ現像装置の一例を示す説明
図である。
FIG. 6 is an explanatory diagram showing an example of a conventional magnetic brush developing device.

【図7】 従来の現像ロールの両端部分を覆う規制部を
示す斜視図である。
FIG. 7 is a perspective view showing a restriction portion that covers both end portions of a conventional developing roll.

【図8】 図7のE部を拡大して示す斜視図である。FIG. 8 is a perspective view showing an enlarged part E of FIG.

【図9】 図7の規制部と現像ロールの間の現像剤の流
れを示す説明図である。
FIG. 9 is an explanatory diagram showing the flow of the developer between the regulating portion and the developing roller of FIG.

【図10】 図7の規制部と現像ロールの間の現像剤の
流れを示す説明図である。
FIG. 10 is an explanatory diagram showing the flow of the developer between the regulating portion and the developing roller of FIG.

【符号の説明】[Explanation of symbols]

40…現像装置、46…現像ロール、46a…両端部
分、48…層厚規制部材、71…固定磁石、72…スリ
ーブ、73…弾性部材
40 ... Developing device, 46 ... Developing roll, 46a ... Both end portions, 48 ... Layer thickness regulating member, 71 ... Fixed magnet, 72 ... Sleeve, 73 ... Elastic member

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 固定磁石と、 この固定磁石の回りに回転可能に設けられ、前記固定磁
石の磁力により現像剤を表面に付着させて静電潜像保持
体へ搬送する円筒状のスリーブと、 このスリーブ上に付着した現像剤の層厚を規制する規制
部材と、 この規制部材の両端部に設けられ、画像領域外に相当す
る前記スリーブの両端部に当接する弾性部材とを具備す
ることを特徴とする磁気ブラシ現像装置。
1. A fixed magnet, and a cylindrical sleeve that is rotatably provided around the fixed magnet and that adheres the developer to the surface by the magnetic force of the fixed magnet and conveys the developer to an electrostatic latent image holding member. A regulating member for regulating the layer thickness of the developer adhered on the sleeve, and elastic members provided at both ends of the regulating member and contacting both ends of the sleeve corresponding to the outside of the image area are provided. Characteristic magnetic brush developing device.
JP4015360A 1992-01-30 1992-01-30 Magnetic brush developing device Expired - Fee Related JP3006255B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4015360A JP3006255B2 (en) 1992-01-30 1992-01-30 Magnetic brush developing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4015360A JP3006255B2 (en) 1992-01-30 1992-01-30 Magnetic brush developing device

Publications (2)

Publication Number Publication Date
JPH05210307A true JPH05210307A (en) 1993-08-20
JP3006255B2 JP3006255B2 (en) 2000-02-07

Family

ID=11886636

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4015360A Expired - Fee Related JP3006255B2 (en) 1992-01-30 1992-01-30 Magnetic brush developing device

Country Status (1)

Country Link
JP (1) JP3006255B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6070037A (en) * 1998-04-20 2000-05-30 Ricoh Company, Ltd. Image forming apparatus having improved developer limiting member

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6070037A (en) * 1998-04-20 2000-05-30 Ricoh Company, Ltd. Image forming apparatus having improved developer limiting member

Also Published As

Publication number Publication date
JP3006255B2 (en) 2000-02-07

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