JPH05216347A - Developing device and image forming device - Google Patents
Developing device and image forming deviceInfo
- Publication number
- JPH05216347A JPH05216347A JP4017993A JP1799392A JPH05216347A JP H05216347 A JPH05216347 A JP H05216347A JP 4017993 A JP4017993 A JP 4017993A JP 1799392 A JP1799392 A JP 1799392A JP H05216347 A JPH05216347 A JP H05216347A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- housing
- doctor blade
- thermal expansion
- image
- 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.)
- Pending
Links
Landscapes
- Magnetic Brush Developing In Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は現像ロ−ラ上に磁性現像
剤からなる磁気ブラシを形成する現像装置及びこの現像
装置を用い感光体上の静電潜像を現像する画像形成装置
の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is an improvement of a developing device for forming a magnetic brush made of a magnetic developer on a developing roller and an image forming device for developing an electrostatic latent image on a photoconductor using the developing device. Regarding
【０００２】[0002]
【従来の技術】従来、画像形成装置等、現像ロ−ラ表面
に形成される磁気ブラシを用いて感光体上の静電潜像を
現像する現像装置にあっては、磁気ブラシの穂立ちの高
さを、現像ロ−ラの長手方向全長に亘り均一化するため
のドクタ−ブレ−ドの材料として、形成時の寸法安定性
及び摩擦帯電特性を考慮し、アルミニウム等の非磁性金
属を使用するのに対し、現像剤を収納し現像ロ−ラ及び
ドクタ−ブレ−ド等を支持する筐体の材料としては、成
型性、軽量化、低コスト化等を考慮し、ポリエチレン等
の合成樹脂を使用するのが一般的であった。2. Description of the Related Art Conventionally, in a developing device such as an image forming device for developing an electrostatic latent image on a photosensitive member by using a magnetic brush formed on the surface of a developing roller, a brush of a magnetic brush is formed. A non-magnetic metal such as aluminum is used as the material for the doctor blade to make the height uniform over the entire length in the longitudinal direction of the developing roller, considering the dimensional stability during formation and triboelectrification characteristics. On the other hand, in consideration of moldability, weight reduction, cost reduction, etc., a synthetic resin such as polyethylene is used as the material of the housing for accommodating the developer and supporting the developing roller and the doctor blade. Was commonly used.
【０００３】[0003]
【発明が解決しようとする課題】従来は、現像ロ−ラ上
に形成される磁気ブラシを用い現像を行う現像装置にお
いて、ドクタ−ブレ−ド及び筐体を構成する材料は、寸
法安定性や成型性等を考慮するものの、熱膨張係数につ
いては考慮される事無く夫々選択されていた。Conventionally, in a developing device for developing using a magnetic brush formed on a developing roller, the material forming the doctor blade and the housing is dimensional stability and Although the moldability and the like were taken into consideration, the thermal expansion coefficient was selected without consideration.
【０００４】このため、ドクタ−ブレ−ドと筐体との熱
膨張係数が異なる事から、製造時に常温中で現像ロ−ラ
の現像スリ−ブとドクタ−ブレ−ドとの間隙を長手方向
全長に亘り均一となるように調整しても、現像装置が設
置される環境温度が変化すると、ドクタ−ブレ−ドと、
これを支持する筐体との温度変化に対する膨脹量あるい
は収縮量が異なる事から、温度変化を生じると剛性の弱
いドクタ−ブレ−ドが撓んでしまっていた。For this reason, since the doctor blade and the housing have different thermal expansion coefficients, the gap between the developing sleeve of the developing roller and the doctor blade at the room temperature at the time of manufacture is set in the longitudinal direction. Even if it is adjusted to be uniform over the entire length, if the environmental temperature in which the developing device is installed changes, doctor blade and
Since the amount of expansion or contraction with respect to the temperature change with the housing supporting this is different, the doctor blade, which has low rigidity, is bent when the temperature changes.
【０００５】即ち、ドクタ−ブレ−ド５０の材料として
熱膨脹係数２．３８×１０−５のアルミニウムを用いる
一方、筐体５１の材料として熱膨張係数１０×１０−５
のアクリルニトリル・ブタジェン・スチレン樹脂（以下
ＡＢＳ樹脂と称す。）を用いた場合、高温時にあって
は、ドクターブレード５０の膨脹量が筐体５１のそれに
比し小さい事から図４に示すように又、低温時にあって
は、ドクターブレード５０の収縮量が筐体５１のそれに
比し小さい事から図５に示すようにドクタ−ブレ−ド５
０が撓み、現像スリ−ブ５２とドクタ−ブレ−ド間の間
隙δが不均一となり、隙間からトナ−飛散を生じ易く周
囲を汚損すると共に、磁気ブラシの穂立ちの高さが不均
一となり、画像に濃淡を生じ画質の低下を招いてしまう
という問題があった。That is, aluminum having a thermal expansion coefficient of 2.38 × 10 −5 is used as the material of the doctor blade 50, while the thermal expansion coefficient of 10 × 10 −5 is used as the material of the housing 51.
When the acrylonitrile-butadiene-styrene resin (hereinafter referred to as ABS resin) is used, the expansion amount of the doctor blade 50 is smaller than that of the housing 51 at high temperature, as shown in FIG. Further, at a low temperature, the contraction amount of the doctor blade 50 is smaller than that of the housing 51, and therefore, as shown in FIG.
0 bends, the gap δ between the developing sleeve 52 and the doctor-blade becomes non-uniform, toner is easily scattered from the gap, the surroundings are soiled, and the height of the spikes of the magnetic brush becomes non-uniform. However, there is a problem in that light and shade are generated in the image and the image quality is deteriorated.
【０００６】そこで本発明は上記課題を解決するもの
で、環境温度の変化にかかわらず現像スリ−ブ及びドク
タ−ブレ−ド間の間隙を均一に保持することにより、ト
ナ−飛散を防止すると共に、画像濃度の均一化を図り良
好な画像を得ることが出来る現像装置及び画像形成装置
を提供することを目的とする。Therefore, the present invention solves the above-mentioned problems. Toner scattering is prevented by maintaining a uniform gap between the developing sleeve and the doctor blade regardless of changes in the ambient temperature. It is an object of the present invention to provide a developing device and an image forming apparatus capable of achieving uniform image density and obtaining a good image.
【０００７】[0007]
【課題を解決するための手段】本発明は、上記課題を解
決するために、現像剤を収納する筐体と、この筐体に支
持され周面に現像剤層が形成される現像剤担持体と、こ
の現像剤担持体との間隔が長手方向全長に渡り均一と成
るよう上記筐体に支持され前記現像剤層の高さを規制す
る非磁性金属からなる規制手段とを具備する現像装置に
おいて、上記筐体を、上記規制手段を形成する非磁性金
属の熱膨張係数と同じ熱膨張係数を有する合成樹脂で形
成するものである。In order to solve the above-mentioned problems, the present invention provides a housing for accommodating a developer, and a developer carrier which is supported by the housing and has a developer layer formed on its peripheral surface. And a restriction means made of a non-magnetic metal that is supported by the casing and restricts the height of the developer layer so that the interval between the developer carrier and the developer carrier is uniform over the entire length in the longitudinal direction. The housing is made of synthetic resin having the same coefficient of thermal expansion as that of the non-magnetic metal forming the regulating means.
【０００８】又本発明は、上記課題を解決するために、
現像剤を収納する筐体と、この筐体に支持され周面に現
像剤層が形成される現像剤担持体と、この現像剤担持体
との間隔が長手方向全長に渡り均一と成るよう上記筐体
に支持され上記現像剤層の高さを規制する非磁性金属か
らなる規制手段を具備する現像装置を、静電潜像が形成
される像担持体の現像位置に設け、上記像担持体に上記
現像剤層を摺接し上記静電潜像を現像する画像形成装置
において、上記筐体を、上記規制手段を形成する非磁性
金属の熱膨張係数と同じ熱膨張係数を有する合成樹脂で
形成するものである。In order to solve the above problems, the present invention provides
A casing for accommodating the developer, a developer carrier supported by the casing and having a developer layer formed on the peripheral surface thereof, and the interval between the developer carrier and the developer carrier are uniform over the entire length in the longitudinal direction. A developing device provided with a regulating means made of a non-magnetic metal that is supported by a casing and regulates the height of the developer layer is provided at the developing position of the image carrier on which an electrostatic latent image is formed, In the image forming apparatus in which the developer layer is slidably contacted with and the electrostatic latent image is developed, the casing is formed of a synthetic resin having the same thermal expansion coefficient as that of the non-magnetic metal forming the regulating means. To do.
【０００９】[0009]
【作用】本発明は上記の様に構成され、ドクタ−ブレ−
ド及びこれを支持する筐体の熱膨張係数が同じであるこ
とから、環境温度の変化にかかわらずドクタ−ブレ−ド
に撓みを生じる事が無く、現像スリ−ブ及びドクタ−ブ
レ−ド間の間隙を常に調整時と同様に一定に保持出来、
磁気ブラシの穂立ちの高さを均一に保持出来る事から、
間隙からのトナ−飛散を生じることがなく周囲の汚損を
防止出来ると共に、長手方向全長にわたる画像濃度の均
一化により良質の画像を得る事が出来る。The present invention is constructed as described above and has a doctor blade.
Since the thermal expansion coefficient of the blade and that of the casing supporting the same are the same, the doctor blade does not bend regardless of changes in the ambient temperature, and the developing sleeve and the doctor blade are not in contact with each other. The gap of can be kept constant as always,
Since the height of the spikes of the magnetic brush can be kept uniform,
It is possible to prevent the toner from scattering from the gaps and prevent the stains on the surroundings, and it is possible to obtain a high-quality image by making the image density uniform over the entire length in the longitudinal direction.
【００１０】[0010]
【実施例】以下、本発明を図１乃至図３に示す実施例を
参照して説明する。図１は、画像形成装置である電子写
真装置全体の内部構成を示すもので、装置本体１内に
は、帯電、露光、現像、転写、剥離、清掃、除電、定着
等を行なう画像形成手段２が内蔵され、、装置本体１の
上面には原稿Ｄを載置する原稿台３が設けられている。
尚４は原稿カバ−である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS. FIG. 1 shows the internal structure of the entire electrophotographic apparatus which is an image forming apparatus. In the apparatus main body 1, an image forming means 2 for performing charging, exposure, development, transfer, peeling, cleaning, charge removal, fixing and the like. And a document table 3 on which the document D is placed is provided on the upper surface of the apparatus main body 1.
Reference numeral 4 is a document cover.
【００１１】そして、装置本体１の下方部には、両面コ
ピ−時、画像形成手段２から搬送された用紙を反転する
自動両面装置１００が設けられ、又装置本体１の右側部
には、用紙Ｐを収納する給紙カセット装置１０及び用紙
Ｐを手差しにより装置本体１に供給する給紙トレイ１１
が設けられている。An automatic double-sided device 100 for reversing the sheet conveyed from the image forming means 2 is provided in the lower part of the apparatus main body 1 at the time of double-sided copying, and the right side of the apparatus main body 1 is provided with a sheet. A paper feed cassette device 10 for storing P and a paper feed tray 11 for manually feeding the paper P to the apparatus main body 1
Is provided.
【００１２】一方、装置本体１内のほぼ中央には、ドラ
ム状の感光体２０が配置され、この感光体２０の周囲に
は、その回転方向に沿って従来より周知の、帯電チャ−
ジャ２１、露光装置２２の露光部２２ａ，現像装置２
３、転写チャ−ジャ２５、剥離チャ−ジャ２６、清掃装
置２７、除電装置２８が順次配置されている。On the other hand, a drum-shaped photoconductor 20 is arranged substantially in the center of the main body 1 of the apparatus.
Ja 21, exposure unit 22a of exposure device 22, developing device 2
3, a transfer charger 25, a peeling charger 26, a cleaning device 27, and a charge eliminating device 28 are sequentially arranged.
【００１３】尚、露光装置２２は、装置本体１の上面に
設けられた原稿台３に載置される原稿Ｄを、背部をリフ
レクタ５０で囲繞された露光ランプ５１で照らし、その
原稿Ｄから反射された光像を第１乃至第３の反射ミラ−
５２〜５４を順次介してレンズ５５に導き、次いで、レ
ンズ５５を透過した光像を、第４乃至第６の反射ミラ−
５６〜５８を順次介して感光体２０に導くようになって
いる。更に装置本体１内には、給紙カセット装置１０及
びその上面に設けられる給紙トレイ１１、更には自動両
面装置１００から第１及び第２のピックアップロ−ラ３
０ａ、３０ｂにより夫々取り出された用紙を、感光体２
０を経て装置本体１の左側に設けられる排紙トレイ９に
導く用紙搬送路３１が形成されている。The exposure device 22 illuminates a document D placed on a document table 3 provided on the upper surface of the device main body 1 with an exposure lamp 51 whose back part is surrounded by a reflector 50, and reflects it from the document D. The first to third reflection mirrors of the reflected light image.
52 to 54 are sequentially guided to the lens 55, and the optical image transmitted through the lens 55 is then reflected by the fourth to sixth reflection mirrors.
It is configured so as to be guided to the photoconductor 20 through 56 to 58 in order. Further, in the main body 1 of the apparatus, the paper feed cassette device 10, the paper feed tray 11 provided on the upper surface thereof, and further, the automatic double-sided device 100 to the first and second pickup rollers 3 are provided.
The papers taken out by 0a and 30b
A sheet conveying path 31 is formed which leads to the sheet discharge tray 9 provided on the left side of the apparatus main body 1 via 0.
【００１４】この用紙搬送路３１の感光体２０より上流
側には、第１及び第２の分離搬送ロ−ラ３２ａ、３２ｂ
並びに、用紙Ｐの先端を揃え、感光体２０との同期を取
りつつ用紙を搬送するレジストロ−ラ対３３が配設さ
れ、下流側には、定着ロ−ラ３４、排紙ロ−ラ対３６が
配置されている。尚、３７は、搬送ロ−ラ対３５により
搬送された用紙Ｐを排紙ロ−ラ対３６側あるいは自動両
面装置１００側のいずれかに振り分けるゲ−トであり、
剥離チャ−ジャ２６と定着ロ−ラ３４との間には、搬送
ベルト３８が配設されている。尚、１０３はゲ−ト３７
により自動両面装置１００側に搬送された用紙を用紙集
積部１０１に搬送する反転搬送路である。The first and second separating / conveying rollers 32a, 32b are provided on the upstream side of the photoconductor 20 in the sheet conveying path 31.
In addition, a registration roller pair 33 that aligns the leading ends of the sheets P and conveys the sheets in synchronization with the photoconductor 20 is provided, and on the downstream side, a fixing roller 34 and a sheet discharge roller pair 36. Are arranged. Reference numeral 37 is a gate for distributing the paper P conveyed by the conveyance roller pair 35 to either the paper ejection roller pair 36 side or the automatic duplexer 100 side.
A conveyor belt 38 is arranged between the peeling charger 26 and the fixing roller 34. Incidentally, 103 is a gate 37
This is a reversing conveyance path for conveying the sheet conveyed to the automatic duplexer 100 side to the sheet stacking unit 101.
【００１５】次に現像装置２３について詳述するが、従
来現像装置２３の筐体２３ａに用いていたＡＢＳ樹脂等
の合成樹脂は、一般にガラス繊維等の熱膨張係数の小さ
い材料を混合すれば、その熱膨張係数が小さくされると
いう特性を有している。Next, the developing device 23 will be described in detail. The synthetic resin such as ABS resin used in the housing 23a of the conventional developing device 23 is generally mixed with a material having a small coefficient of thermal expansion such as glass fiber. It has a characteristic that its coefficient of thermal expansion is reduced.
【００１６】そこで本実施例においては、トナ−及びキ
ャリアからなる二成分現像剤４０を収納する現像装置２
３の筐体２３ａを、ポリカ−ボネイトにガラス繊維を３
０［％］配合することにより熱膨張係数が２．４×１０
−５とされる合成樹脂で形成している。Therefore, in this embodiment, the developing device 2 for accommodating the two-component developer 40 composed of a toner and a carrier.
The housing 23a of 3 is made of polycarbonate and glass fiber 3
Coefficient of thermal expansion of 2.4 × 10 by blending 0%
It is made of a synthetic resin of -5 .
【００１７】そして筐体２３ａはその開口部において、
マグネットロ−ラ４１ａ及びこれを囲繞する現像剤担持
体である現像スリ−ブ４１ｂからなる現像ロ−ラ４１を
支持している。The housing 23a has an opening at its opening.
It supports a developing roller 41 including a magnet roller 41a and a developing sleeve 41b which is a developer carrier surrounding the magnet roller 41a.
【００１８】更に筐体２３ａには、現像スリ−ブ４１ｂ
上に形成される現像剤層である磁気ブラシ４２の穂立ち
の高さをその長手方向全長に亘って均一となるように規
制するため、熱膨張係数が２．３８×１０−５であるア
ルミニウムからなるドクタ−ブレ−ド４３がネジ４４に
よりネジ止めされている。The housing 23a further includes a developing sleeve 41b.
Aluminum having a thermal expansion coefficient of 2.38 × 10 −5 in order to regulate the height of the spikes of the magnetic brush 42, which is the developer layer formed above, so as to be uniform over the entire length in the longitudinal direction thereof. The doctor blade 43 is fixed by screws 44.
【００１９】即ち、ドクタ−ブレ−ド４３及びこれを支
持する筐体２３ａの熱膨張係数はほぼ同じとされる。そ
して、現像スリ−ブ４１ｂとの間隙が一定となるように
ドクタ−ブレ−ド４３を筐体２３ａにネジ止めする調整
操作は通常は常温において行われる。That is, the doctor blade 43 and the housing 23a supporting the doctor blade 43 have substantially the same thermal expansion coefficient. The adjusting operation for screwing the doctor blade 43 to the housing 23a so that the gap between the developing sleeve 41b and the developing sleeve 41b is constant is usually performed at room temperature.
【００２０】尚、４３、４４は筐体２３ａ内において二
成分現像剤４０を撹拌する第１及び第２のミキサであ
る。Reference numerals 43 and 44 are first and second mixers for stirring the two-component developer 40 in the housing 23a.
【００２１】次に作用についてのべる。コピ−開始時、
所定サイズの用紙を収納した給紙カセット装置１０を装
置本体に装着し、次いで原稿Ｄを原稿台３上に載置し、
コピ−枚数、コピ−倍率、画像濃度等のコピ−条件を図
示しない操作パネル上の入力キ−よりセットした後、コ
ピ−ボタン（図示せず）をオンし、コピ−操作を開始す
る。Next, the operation will be described. At the beginning of the copy,
The paper feed cassette device 10 accommodating paper of a predetermined size is mounted in the main body of the device, and then the document D is placed on the document table 3.
After setting the copy conditions such as the number of copies, the copy magnification, and the image density from the input keys on the operation panel (not shown), the copy button (not shown) is turned on to start the copy operation.
【００２２】これにより感光体２０はその回転に従い、
帯電チャ−ジャ２１により一様に帯電され、露光部２２
ａにおいて静電潜像を形成され、現像装置２３に達す
る。As a result, the photoconductor 20 follows its rotation,
The exposure unit 22 is uniformly charged by the charging charger 21.
An electrostatic latent image is formed at a and reaches the developing device 23.
【００２３】そして、現像装置２３にあっては、現像ス
リ−ブ４１ｂの回転により形成される磁気ブラシ４２
が、ドクタ−ブレ−ド４３によりその穂立ちの高さを均
一に規制された状態で感光体２０に摺接し、感光体２０
上の静電潜像を均一に現像する事となる。In the developing device 23, the magnetic brush 42 formed by the rotation of the developing sleeve 41b.
However, the doctor blade 43 slidably contacts the photoconductor 20 in a state where the height of its spikes is regulated uniformly.
The electrostatic latent image above is developed uniformly.
【００２４】一方、給紙カセット装置１０にあっては、
第１のピックアップロ−ラ３０ａが駆動され、最上位の
用紙Ｐが取り出される。そしてこの取り出された用紙Ｐ
は第１の分離搬送ロ−ラ３２ａを経て、一旦レジストロ
−ラ対３３位置で停止され、画像形成手段２による感光
体２０上の現像剤像に同期して感光体２０と転写チャ−
ジャ２５の間へと送られ感光体２０上の現像剤像を転写
される。この現像剤像を転写された用紙Ｐは剥離チャ−
ジャ２６により、感光体２０から剥離され、搬送ベルト
３８により搬送され、定着ロ−ラ３４に送られて画像を
定着され、排紙トレイ９方向に排出される。尚、転写終
了後感光体２０は、清掃装置２７、除電装置２８を経て
次のコピ−可能とされる。そして上述の画像形成手段２
によるコピ−操作及び用紙Ｐの搬送操作を繰り返し、必
要枚数のコピ−を得た後、全てのコピ−操作を終了す
る。On the other hand, in the paper feed cassette device 10,
The first pickup roller 30a is driven and the uppermost sheet P is taken out. Then, the paper P taken out
Passes through the first separating / conveying roller 32a, is temporarily stopped at the position of the registration roller pair 33, and is synchronized with the photosensitive member 20 and the transfer charge in synchronization with the developer image on the photosensitive member 20 by the image forming means 2.
The developer image on the photoconductor 20 is transferred to the space between the jars 25 and transferred. The paper P on which the developer image is transferred is peeled off.
The paper is separated from the photoconductor 20 by the jar 26, conveyed by the conveyor belt 38, conveyed to the fixing roller 34 to fix the image, and ejected toward the paper ejection tray 9. After the transfer is completed, the photoconductor 20 can be copied next through the cleaning device 27 and the static eliminator 28. Then, the above-mentioned image forming means 2
The copy operation and the paper P transport operation are repeated to obtain the required number of copies, and then all the copy operations are completed.
【００２５】そしてこのようにコピ−操作を行う間、例
えば周囲の温度上昇により現像装置２３が加熱されると
筐体２３ａ及びドクタ−ブレ−ド４３が夫々熱膨脹され
るが、筐体２３ａ及びドクタ−ブレ−ド４３両方の熱膨
張係数がほぼ同じであり、ほぼ同じ長さ膨脹されるの
で、ドクタ−ブレ−ド４３は図３の点線に示す様に撓む
事が無く現像スリ−ブ４１ｂに平行な状態で膨脹され
る。While the copying operation is performed in this manner, if the developing device 23 is heated by, for example, an increase in ambient temperature, the housing 23a and the doctor blade 43 are thermally expanded, but the housing 23a and the doctor blade 43 are expanded. Since the thermal expansion coefficients of both blades 43 are substantially the same and are expanded by substantially the same length, the doctor blade 43 does not bend as shown by the dotted line in FIG. 3 and the developing sleeve 41b does not bend. It is inflated in a state parallel to.
【００２６】又逆に、製造時等、常温にてドクタ−ブレ
−ド４３を調整後、装置本体１０を寒冷地等に設置する
と、筐体２３ａ及びドクタ−ブレ−ド４３が夫々収縮さ
れるが、膨脹時と同様、筐体２３ａ及びドクタ−ブレ−
ド４３はほぼ同じ長さ収縮され、ドクタ−ブレ−ド４３
は図３に点線で示す様に撓む事が無い。On the contrary, when the apparatus body 10 is installed in a cold region after adjusting the doctor blade 43 at room temperature during manufacturing, the housing 23a and the doctor blade 43 are contracted respectively. However, as in the case of expansion, the housing 23a and the doctor blade
The doctor blade 43 is contracted to the same length as the doctor blade 43.
Does not bend as shown by the dotted line in FIG.
【００２７】この様に構成すれば、筐体２３ａが、ドク
タ−ブレ−ド４３の熱膨張係数とほぼ同じ熱膨張係数を
有する合成樹脂により形成されることから、その成型性
が損なわれる事無く、しかも任意の環境温度にてドクタ
−ブレ−ド４３を筐体２３ａに取り付け調整した後に環
境温度が変化したとしても、筐体２３ａ及びドクタ−ブ
レ−ド４３の、温度変化に対する膨脹量あるいは収縮量
がほぼ同じとされる。従って、環境温度の変化にかかわ
らず、剛性の弱いドクタ−ブレ−ド４３が撓む事が無
く、従来の様にドクタ−ブレ−ド４３の撓みにより、磁
気ブラシ４２の穂立ちの高さが不均一とされ、画像濃度
にばらつきを生じるという事が無く、良好な画像を得ら
れると共に、隙間からのトナ−の飛散による周囲の汚損
も防止される。According to this structure, the housing 23a is made of synthetic resin having a coefficient of thermal expansion substantially the same as that of the doctor blade 43, so that its moldability is not impaired. Moreover, even if the environmental temperature changes after the doctor blade 43 is attached and adjusted to the housing 23a at an arbitrary environmental temperature, the expansion amount or contraction of the housing 23a and the doctor blade 43 with respect to the temperature change. The amount is almost the same. Therefore, the doctor blade 43, which has low rigidity, does not bend regardless of the change in the environmental temperature, and the height of the spikes of the magnetic brush 42 is increased by the bending of the doctor blade 43 as in the conventional case. The image is not uniform, the image density does not vary, and a good image can be obtained, and the stain around the toner due to the scattering of the toner from the gap is prevented.
【００２８】尚、本発明は、上記一実施例に限られるも
のでは無く、その趣旨を変えない範囲での変更は可能で
あって、例えば規制手段の材料は、非磁性金属であれ
ば、ステンレス鋼等であっても良いし、筐体材料の合成
樹脂もＡＢＳ樹脂にガラス繊維を配合する等しても良
い。また、筐体材料としては合成樹脂に限らず、ドクタ
ーブレード４３の熱膨張係数を有した物質であれば良
い。It should be noted that the present invention is not limited to the above-mentioned one embodiment, and may be modified within the scope of the invention. For example, if the material of the regulating means is a non-magnetic metal, stainless steel is used. It may be steel or the like, and the synthetic resin of the casing material may be ABS resin mixed with glass fiber. Further, the casing material is not limited to the synthetic resin, and any substance having the thermal expansion coefficient of the doctor blade 43 may be used.
【００２９】[0029]
【発明の効果】以上説明したように本発明によれば、現
像装置の筐体材料として、規制手段の材料の熱膨張係数
と同じ熱膨張係数を有する合成樹脂を用いる事により、
その成型性を損なう事無く、しかも環境温度の変化にか
かわらず、規制手段が撓む事がないので飛散トナ−防止
による周囲の汚損防止を図れると共に、長手方向全長に
亘り現像剤層の高さを均一に保持でき、均一な画像濃度
を得られる事から画質向上を図る事が出来る。As described above, according to the present invention, by using the synthetic resin having the same coefficient of thermal expansion as that of the material of the regulating means as the casing material of the developing device,
The moldability is not impaired, and the regulating means does not bend regardless of changes in the ambient temperature, so that the surroundings can be prevented by the scattering toner and the height of the developer layer can be prevented over the entire length in the longitudinal direction. Can be held uniformly, and uniform image density can be obtained, so image quality can be improved.
【図１】本発明の一実施例の装置本体を示す構成図であ
る。FIG. 1 is a configuration diagram showing a device body of an embodiment of the present invention.
【図２】本発明の一実施例の現像装置を示す断面図であ
る。FIG. 2 is a sectional view showing a developing device according to an embodiment of the present invention.
【図３】本発明の一実施例の現像装置を感光体側から見
た正面図である。FIG. 3 is a front view of the developing device according to the exemplary embodiment of the present invention as viewed from the photoconductor side.
【図４】従来の装置の高温時におけるクリ−ニングブレ
−ドの撓みを示す説明図である。FIG. 4 is an explanatory view showing the bending of the cleaning blade of the conventional device at high temperature.
【図５】従来の装置の低温時におけるクリ−ニングブレ
−ドの撓みを示す説明図である。FIG. 5 is an explanatory view showing bending of the cleaning blade of the conventional device at low temperature.
１…装置本体 ２３…現像装置 ２３ａ…筐体 ４１…現像ロ−ラ ４２…磁気ブラシ ４３…ドクタ−ブレ−ド DESCRIPTION OF SYMBOLS 1 ... Device main body 23 ... Developing device 23a ... Housing 41 ... Developing roller 42 ... Magnetic brush 43 ... Doctor blade
Claims (2)
持され周面に現像剤層が形成される現像剤担持体と、こ
の現像剤担持体との間隔が長手方向全長に渡り均一と成
るよう前記筐体に支持され前記現像剤層の高さを規制す
る非磁性金属からなる規制手段とを具備する現像装置に
おいて、前記筐体を、前記規制手段を形成する非磁性金
属の熱膨張係数と同じ熱膨張係数を有する合成樹脂で形
成する事を特徴とする現像装置。1. A housing for accommodating a developer, a developer carrier supported by the housing and having a developer layer formed on a peripheral surface thereof, and a space between the developer carrier and the developer carrier extends over the entire length in the longitudinal direction. In a developing device comprising a non-magnetic metal supporting unit that regulates the height of the developer layer so as to be uniform, the housing is made of a non-magnetic metal forming the regulating unit. A developing device formed of a synthetic resin having the same coefficient of thermal expansion as the coefficient of thermal expansion.
持され周面に現像剤層が形成される現像剤担持体と、こ
の現像剤担持体との間隔が長手方向全長に渡り均一と成
るよう前記筐体に支持され前記現像剤層の高さを規制す
る非磁性金属からなる規制手段を具備する現像装置を、
静電潜像が形成される像担持体の現像位置に設け、前記
像担持体に前記現像剤層を摺接し前記静電潜像を現像す
る画像形成装置において、前記筐体を、前記規制手段を
形成する非磁性金属の熱膨張係数と同じ熱膨張係数を有
する合成樹脂で形成する事を特徴とする画像形成装置。2. A housing for accommodating a developer, a developer carrier supported by the housing and having a developer layer formed on a peripheral surface thereof, and a distance between the developer carrier and the developer carrier is the entire length in the longitudinal direction. A developing device provided with a regulation unit made of a non-magnetic metal that is supported by the casing so as to be uniform and regulates the height of the developer layer;
In the image forming apparatus, which is provided at a developing position of an image bearing member on which an electrostatic latent image is formed, and in which the developer layer is slidably contacted with the image bearing member to develop the electrostatic latent image, the casing is provided with the regulating unit. An image forming apparatus characterized by being formed of a synthetic resin having the same coefficient of thermal expansion as that of the non-magnetic metal forming the.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4017993A JPH05216347A (en) | 1992-02-04 | 1992-02-04 | Developing device and image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4017993A JPH05216347A (en) | 1992-02-04 | 1992-02-04 | Developing device and image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05216347A true JPH05216347A (en) | 1993-08-27 |
Family
ID=11959252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4017993A Pending JPH05216347A (en) | 1992-02-04 | 1992-02-04 | Developing device and image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05216347A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7783226B2 (en) | 2005-11-29 | 2010-08-24 | Brother Kogyo Kabushiki Kaisha | Image forming apparatus |
| US7835663B2 (en) | 2006-06-30 | 2010-11-16 | Brother Kogyo Kabushiki Kaisha | Image-forming device having sheet metal frame fixed over resin frame with screws |
| US7894743B2 (en) | 2006-06-30 | 2011-02-22 | Brother Kogyo Kabushiki Kaisha | Image-forming device having side walls |
-
1992
- 1992-02-04 JP JP4017993A patent/JPH05216347A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7783226B2 (en) | 2005-11-29 | 2010-08-24 | Brother Kogyo Kabushiki Kaisha | Image forming apparatus |
| US7835663B2 (en) | 2006-06-30 | 2010-11-16 | Brother Kogyo Kabushiki Kaisha | Image-forming device having sheet metal frame fixed over resin frame with screws |
| US7894743B2 (en) | 2006-06-30 | 2011-02-22 | Brother Kogyo Kabushiki Kaisha | Image-forming device having side walls |
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