JPH0784452A - Developing device for nonmagnetic one-component toner - Google Patents
Developing device for nonmagnetic one-component tonerInfo
- Publication number
- JPH0784452A JPH0784452A JP23153693A JP23153693A JPH0784452A JP H0784452 A JPH0784452 A JP H0784452A JP 23153693 A JP23153693 A JP 23153693A JP 23153693 A JP23153693 A JP 23153693A JP H0784452 A JPH0784452 A JP H0784452A
- Authority
- JP
- Japan
- Prior art keywords
- developing
- holder plate
- developing roller
- toner
- pressure contact
- 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
- 238000010586 diagram Methods 0.000 description 6
- 238000005452 bending Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Landscapes
- Dry Development In Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電子写真プリンタ、複
写機、ファクシミリ等に用いられる非磁性１成分トナ−
用現像装置に係り、特に現像ブレ−ドの構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-magnetic one-component toner used in electrophotographic printers, copying machines, facsimiles and the like.
The present invention relates to a developing device, and particularly to the structure of a developing blade.
【０００２】[0002]
【従来の技術】従来、電子写真プリンタ、複写機、ファ
クシミリ等に用いられる非磁性１成分トナ−用現像装置
（以後現像装置と記す）には画像形成部に隣接する現像
ロ−ラの軸方向に延在する現像ブレ−ドの長手を第１の
ホルダプレ−トと第２のホルダプレ−トとで挟んで片持
ち状に固定し、自由端側の一方の面を現像ロ−ラ面に圧
接し、現像ロ−ラを回転して現像ブレ−ドによりトナ−
を現像ロ−ラ面に薄層化しているものがある。2. Description of the Related Art Conventionally, in a developing device for a non-magnetic one-component toner (hereinafter referred to as a developing device) used in an electrophotographic printer, a copying machine, a facsimile, etc., an axial direction of a developing roller adjacent to an image forming portion. The length of the developing blade extending over the first holder plate and the second holder plate is sandwiched and fixed in a cantilever manner, and one surface on the free end side is pressed against the developing roller surface. Then, the developing roller is rotated and the toner is developed by the developing blade.
There is a developing roller having a thin layer.
【０００３】図５は従来例の概略構成を示す模式図であ
る。現像装置はトナ−カ−トリッジ１から補給されたト
ナ−を撹拌部２、スポンジロ−ラ３、現像ロ−ラ４を介
して画像形成部の感光ドラム５に供給する。感光ドラム
５の外周部には図示せぬ画像形成装置が配設してあり、
感光ドラム５の回転動作に伴って感光ドラム５の表面に
静電潜像を形成する。FIG. 5 is a schematic diagram showing a schematic configuration of a conventional example. The developing device supplies the toner replenished from the toner cartridge 1 to the photosensitive drum 5 of the image forming unit via the stirring unit 2, the sponge roller 3, and the developing roller 4. An image forming device (not shown) is provided on the outer peripheral portion of the photosensitive drum 5,
An electrostatic latent image is formed on the surface of the photosensitive drum 5 as the photosensitive drum 5 rotates.
【０００４】感光ドラム５に隣接する現像ロ−ラ４には
可撓性を有する現像ブレ−ド６が圧接してある。即ち、
現像ブレ−ド６は現像ロ−ラ４の軸方向に延在する長手
を第１のホルダプレ−ト７と第２のホルダプレ−ト８と
で挟み、ねじ９で片持ち状に固定し、自由端側の一方の
面を現像ロ−ラ面に圧接している。A developing blade 6 having flexibility is pressed against the developing roller 4 adjacent to the photosensitive drum 5. That is,
The developing blade 6 is sandwiched between the first holder plate 7 and the second holder plate 8 along the length extending in the axial direction of the developing roller 4, and is fixed in a cantilever manner with a screw 9, so that the developing blade 6 is free. One surface on the end side is in pressure contact with the developing roller surface.
【０００５】自由端側の撓み量δは第２のホルダプレ−
ト８の端部８ａから圧接部までの距離をＬとし、圧接部
での圧接力をＰとすると、δ＝（Ｐ・Ｌ・Ｌ・Ｌ）／
（３・Ｅ・Ｉ）・・・（１）となる。（Ｅ：ヤング係
数、Ｉ：断面２次モ−メント） 第１のホルダプレ−ト７と第２のホルダプレ−ト８とは
現像装置のフレ−ムに固定してある。The deflection amount δ on the free end side is determined by the second holder plate.
If the distance from the end 8a of the gutter 8 to the pressure contact portion is L and the pressure contact force at the pressure contact portion is P, then δ = (P · L·L·L) /
(3 · E · I) (1) (E: Young's Modulus, I: Secondary Moment of Section) The first holder plate 7 and the second holder plate 8 are fixed to the frame of the developing device.
【０００６】現像ロ−ラ４はロ−ラ面をマイナスの電圧
に印加してあり、現像ロ−ラ４を回転すると、スポンジ
ロ−ラ３側から供給されるマイナスの電荷を帯びたトナ
−を現像ロ非磁性１成分トナ−の−ラ面に付着し、圧接
部で現像ブレ−ド６により適宜現像ロ−ラ面に薄層化す
る。（現像ロ−ラ面の電圧＞トナ−の電圧） 感光ドラム５は現像ロ−ラ４からトナ−を供給されて静
電潜像を現像化し、図示せぬ転写装置を介して印刷用紙
にトナ−を転写する。The developing roller 4 has a roller surface applied with a negative voltage, and when the developing roller 4 is rotated, a toner having a negative charge supplied from the sponge roller 3 side is supplied. The developing roller adheres to the roller surface of the non-magnetic one-component toner, and is appropriately thinned on the developing roller surface by the developing blade 6 at the pressure contact portion. (Voltage on developing roller surface> toner voltage) The photosensitive drum 5 is supplied with a toner from the developing roller 4 to develop an electrostatic latent image, and the toner is printed on a printing sheet via a transfer device (not shown). -Transcribe.
【０００７】[0007]
【発明が解決しようとする課題】従来の非磁性１成分ト
ナ−用現像装置にあっては、スポンジロ−ラ側から供給
されるトナ−は現像ロ−ラ面に付着し、圧接部で現像ブ
レ−ドを適宜掻い潜って現像ロ−ラ面に薄層化してい
る。In the conventional developing device for a non-magnetic one-component toner, the toner supplied from the sponge roller side adheres to the surface of the developing roller, and the developing blur occurs at the pressure contact portion. The surface of the developing roller is thinned by appropriately digging into the surface.
【０００８】しかしながら、圧接部での撓み量δは従来
技術で述べたように一定にならず、現実にはねじの締め
付け力が影響しており、図６に示すようにねじの固着位
置に一番近いＡ点とＢ点で大きい圧接力Ｐが現像ロ−ラ
面に作用し、Ａ点、Ｂ点を少し離れると圧接力Ｐは略一
定になる。However, the bending amount δ at the pressure contact portion is not constant as described in the prior art, and in reality, the tightening force of the screw has an effect, and as shown in FIG. A large pressure contact force P acts on the developing roller surface at the closest points A and B, and the pressure contact force P becomes substantially constant when the points A and B are slightly separated.
【０００９】従って、圧接部での薄層化されたトナ−の
厚さはＡ点、Ｂ点を少し離れると略一定となるが、Ａ点
とＢ点では薄くなる。よって、印刷濃度に濃淡を発生す
るという問題点があった。Therefore, the thickness of the thinned toner at the pressure contact portion becomes substantially constant at a little distance from the points A and B, but becomes thin at the points A and B. Therefore, there is a problem in that the print density varies.
【００１０】本発明は均一な印刷濃度を有する非磁性１
成分トナ−用現像装置を提供することを目的としてい
る。The present invention is a non-magnetic material 1 having a uniform print density.
An object is to provide a developing device for a component toner.
【００１１】[0011]
【課題を解決するための手段】上記目的を達成するため
に本発明の非磁性１成分トナ−用現像装置においては、
現像ロ−ラの軸方向に延在する長手が第２のホルダプレ
−トと同じか、もしくは長く、短手が第２のホルダプレ
−トより短いシムを現像ブレ−ドと第２のホルダプレ−
トとの間に設ける。In order to achieve the above object, in the developing device for a non-magnetic one-component toner of the present invention,
A shim whose length extending in the axial direction of the developing roller is the same as or longer than that of the second holder plate and whose shorter side is shorter than that of the second holder plate is used as the developing blade and the second holder plate.
To be installed between
【００１２】[0012]
【作用】上記のように構成された非磁性１成分トナ−用
現像装置の現像ブレ−ドは第２のホルダプレ−トとの間
に短手が第２のホルダプレ−トより短いシムを設けてい
るので、自由端側の距離が長くなり、ねじの固着位置に
一番近い圧接部近傍での圧接力とその近傍以外の圧接力
とが均一化して、均一な薄層が得られる。In the developing blade of the developing device for a non-magnetic one-component toner constructed as described above, a shim whose short side is shorter than that of the second holder plate is provided between the developing blade and the second holder plate. Therefore, the distance on the free end side becomes long, and the pressure contact force in the vicinity of the pressure contact portion closest to the screw fixing position and the pressure contact force other than the vicinity thereof are made uniform, and a uniform thin layer can be obtained.
【００１３】従って本発明よれば、印刷濃度が均一化す
る。Therefore, according to the present invention, the print density becomes uniform.
【００１４】[0014]
【実施例】本発明の実施例について図面を参照しながら
説明する。尚、各図面に共通な要素には同一符号を付
す。Embodiments of the present invention will be described with reference to the drawings. Elements common to the drawings are given the same reference numerals.
【００１５】本実施例が従来技術と異なるところは現像
ブレ−ドの構造であり、その他の構造は従来技術と同じ
である。よって、従来技術と同じ要素には同一符号を付
して説明は省略する。This embodiment is different from the prior art in the structure of the developing blade, and the other structures are the same as those in the prior art. Therefore, the same elements as those of the conventional technique are designated by the same reference numerals and the description thereof will be omitted.
【００１６】図１は実施例の現像ブレ−ドと現像ロ−ラ
との端部近傍の分解斜視図である。図２は実施例の概略
構成を示す模式図である。図３は図１の組立図である。
現像装置は現像ブレ−ド６と第２のホルダプレ−ト８と
の間にシム１０を設ける。シム１０は現像ロ−ラ４の軸
方向に延在する長手が第２のホルダプレ−ト８より長
く、短手が第２のホルダプレ−ト８より短い。FIG. 1 is an exploded perspective view in the vicinity of the ends of the developing blade and the developing roller of the embodiment. FIG. 2 is a schematic diagram showing a schematic configuration of the embodiment. FIG. 3 is an assembly view of FIG.
The developing device is provided with a shim 10 between the developing blade 6 and the second holder plate 8. The length of the shim 10 extending in the axial direction of the developing roller 4 is longer than that of the second holder plate 8 and the width thereof is shorter than that of the second holder plate 8.
【００１７】現像ブレ−ド６と現像ロ−ラ４との両端部
には、トナ−を外部にもらさないように図１、図３に示
すようなスポンジ材からなるシ−ル部材１１が対称に設
けてある。シ−ル部材１１はスポンジロ−ラ３の軸３ａ
の周囲を穴１１ａで密封し、端面１１ｂをスポンジロ−
ラ３の側面に押し当て、切れ目１１ｃに現像ブレ−ド６
の先端部を挟み込み、剛性の高い第２のホルダプレ−ト
８を逃げ、可撓性を有する現像ブレ−ド６の端部に沿っ
て配置することにより、密封性を保っている。本実施例
の現像装置の動作は従来技術と同様であるので、その説
明は省略するが現像ロ−ラ面への薄層化に当たって現像
ブレ−ド６は以下のように作用する。シム１０を設けた
ことにより、現像ブレ−ド６の曲げ開始位置はシム１０
の端部１０ａとなる。現像ブレ−ド６と現像ロ−ラ４と
の圧接部からシム１０の端部１０ａまでの距離をＬ1 と
し、撓み量δを従来技術と同じとすると、圧接部での圧
接力Ｐは、従来技術で述べた数式（１）を変形して、Ｐ
＝（３・Ｅ・Ｉ・δ）／（Ｌ1 ・Ｌ1 ・Ｌ1 ）・・・・
・（２） となる。距離Ｌ1 は従来技術で述べた距離Ｌより長いの
で圧接力Ｐは弱くなる。ねじの締め付け力の影響を考慮
して圧接部近傍での圧接力Ｐを求めると、図４に示すよ
うになる。図４から分かるように、圧接力Ｐはねじ９の
固着位置に一番近いＡ点とＢ点で少し強くなるが、略一
定となる。Sealing members 11 made of a sponge material as shown in FIGS. 1 and 3 are symmetrical at both ends of the developing blade 6 and the developing roller 4 so as not to expose the toner to the outside. It is provided in. The seal member 11 is a shaft 3a of the sponge roller 3.
The periphery of is sealed with a hole 11a, and the end face 11b is sponge-rolled.
It is pressed against the side of the la 3 and the development blade 6 is placed on the cut 11c.
The second holder plate 8 having a high rigidity is squeezed, the second holder plate 8 having a high rigidity is escaped, and the second holder plate 8 is arranged along the end portion of the developing blade 6 having flexibility, so that the hermeticity is maintained. Since the operation of the developing device of this embodiment is the same as that of the prior art, the description thereof is omitted, but the developing blade 6 acts as follows in thinning the developing roller surface. By providing the shim 10, the bending start position of the developing blade 6 is the shim 10.
End portion 10a. Assuming that the distance from the pressure contact portion between the developing blade 6 and the development roller 4 to the end portion 10a of the shim 10 is L1 and the amount of deflection δ is the same as in the prior art, the pressure contact force P at the pressure contact portion is By modifying the mathematical expression (1) described in the technique, P
= (3 ・ E ・ I ・ δ) / (L1 ・ L1 ・ L1) ・ ・ ・ ・
・ It becomes (2). Since the distance L1 is longer than the distance L described in the prior art, the pressure contact force P becomes weak. The pressure contact force P in the vicinity of the pressure contact portion is calculated in consideration of the influence of the tightening force of the screw, as shown in FIG. As can be seen from FIG. 4, the pressure contact force P becomes slightly stronger at points A and B, which are the closest to the position where the screw 9 is fixed, but is substantially constant.
【００１８】従って、スポンジロ−ラ３側から供給され
るトナ−は圧接部で現像ブレ−ド６を適宜掻い潜ると、
現像ロ−ラ面に均一に薄層化される。よって、感光ドラ
ム５の静電潜像を現像化し、図示せぬ転写装置を介して
印刷用紙に転写されたトナ−の濃度は均一となる。Therefore, when the toner supplied from the side of the sponge roller 3 appropriately scrapes down the developing blade 6 at the pressure contact portion,
The developing roller surface is uniformly thinned. Therefore, the electrostatic latent image on the photosensitive drum 5 is developed, and the density of the toner transferred to the printing paper via the transfer device (not shown) becomes uniform.
【００１９】[0019]
【発明の効果】本発明は、以上説明したように構成され
ているので以下に記載される効果を奏する。Since the present invention is configured as described above, it has the following effects.
【００２０】長手が第２のホルダプレ−トと同じか、も
しくは長く、短手が第２のホルダプレ−トより短いシム
を現像ブレ−ドと第２のホルダプレ−トとの間に設けた
ことにより、自由端側の距離が長くなり、ねじの固着位
置に一番近い圧接部近傍での圧接力とその近傍以外の圧
接力とが均一化して、均一な薄層が得られる。By providing a shim between the developing blade and the second holder plate, the shim having the same length as the second holder plate or a longer length and a shorter length than the second holder plate. The distance on the free end side becomes longer, and the pressure contact force in the vicinity of the pressure contact portion closest to the screw fixing position and the pressure contact force other than the vicinity are made uniform, and a uniform thin layer can be obtained.
【図１】現像ブレ−ド端部の分解斜視図である。FIG. 1 is an exploded perspective view of a developing blade end portion.
【図２】実施例の概略構成を示す模式図である。FIG. 2 is a schematic diagram illustrating a schematic configuration of an example.
【図３】図１の組立状態を示す斜視図である。FIG. 3 is a perspective view showing an assembled state of FIG.
【図４】実施例の現像ブレ−ドによる圧接力状態図であ
る。FIG. 4 is a diagram showing a state of pressure contact force by the developing blade of the embodiment.
【図５】従来例の概略構成を示す模式図である。FIG. 5 is a schematic diagram showing a schematic configuration of a conventional example.
【図６】従来例の現像ブレ−ドによる圧接力状態図であ
る。FIG. 6 is a state diagram of pressure contact force by a developing blade of a conventional example.
４ 現像ロ−ラ ６ 現像ブレ−ド ７ 第１のホルダプレ−ト ８ 第２のホルダプレ−ト １０ シム 4 Developing Roller 6 Developing Blade 7 First Holder Plate 8 Second Holder Plate 10 Shim
Claims (1)
向に延在する現像ブレ−ドの長手を第１のホルダプレ−
トと第２のホルダプレ−トとで挟んで片持ち状に固定
し、自由端側の一方の面を現像ロ−ラ面に圧接し、現像
ロ−ラを回転して現像ブレ−ドによりトナ−を現像ロ−
ラ面に薄層化する非磁性１成分トナ−用現像装置におい
て、 長手が第２のホルダプレ−トと同じか、もしくは長く、
短手が第２のホルダプレ−トより短いシムを現像ブレ−
ドと第２のホルダプレ−トとの間に設け、薄層を均一化
したことを特徴とする非磁性１成分トナ−用現像装置。1. A length of a developing blade extending in an axial direction of a developing roller adjacent to an image forming portion is set to a first holder plate.
It is sandwiched between the second holder plate and the second holder plate and fixed in a cantilever manner, one surface on the free end side is pressed against the developing roller surface, the developing roller is rotated, and the toner is developed by the developing blade. − Is development
In the developing device for a non-magnetic one-component toner, which has a thin layer on the rough surface, the length is the same as or longer than that of the second holder plate,
Develop a shim whose width is shorter than the second holder plate.
A developing device for a non-magnetic one-component toner, characterized in that a thin layer is provided uniformly between the second holder plate and the second holder plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23153693A JP3197122B2 (en) | 1993-09-17 | 1993-09-17 | Developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23153693A JP3197122B2 (en) | 1993-09-17 | 1993-09-17 | Developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0784452A true JPH0784452A (en) | 1995-03-31 |
| JP3197122B2 JP3197122B2 (en) | 2001-08-13 |
Family
ID=16925037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23153693A Expired - Fee Related JP3197122B2 (en) | 1993-09-17 | 1993-09-17 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3197122B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5937253A (en) * | 1997-03-27 | 1999-08-10 | Matsushita Electric Industrial Co., Ltd. | Developing apparatus and L-shaped toner regulating blade therefor |
| US7362992B2 (en) | 2005-03-17 | 2008-04-22 | Oki Data Corporation | Developing unit and image forming apparatus |
| CN100414450C (en) * | 2002-04-23 | 2008-08-27 | 夏普公司 | Non-magnetic single-component developing device |
| CN100555105C (en) | 2005-03-17 | 2009-10-28 | 日本冲信息株式会社 | Display and image processing system |
| JP2014174462A (en) * | 2013-03-12 | 2014-09-22 | Ricoh Co Ltd | Image forming apparatus |
-
1993
- 1993-09-17 JP JP23153693A patent/JP3197122B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5937253A (en) * | 1997-03-27 | 1999-08-10 | Matsushita Electric Industrial Co., Ltd. | Developing apparatus and L-shaped toner regulating blade therefor |
| CN100414450C (en) * | 2002-04-23 | 2008-08-27 | 夏普公司 | Non-magnetic single-component developing device |
| US7362992B2 (en) | 2005-03-17 | 2008-04-22 | Oki Data Corporation | Developing unit and image forming apparatus |
| CN100555105C (en) | 2005-03-17 | 2009-10-28 | 日本冲信息株式会社 | Display and image processing system |
| JP2014174462A (en) * | 2013-03-12 | 2014-09-22 | Ricoh Co Ltd | Image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3197122B2 (en) | 2001-08-13 |
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