JPH0643792A - Cleaning roller for electrophotographic device - Google Patents
Cleaning roller for electrophotographic deviceInfo
- Publication number
- JPH0643792A JPH0643792A JP15707592A JP15707592A JPH0643792A JP H0643792 A JPH0643792 A JP H0643792A JP 15707592 A JP15707592 A JP 15707592A JP 15707592 A JP15707592 A JP 15707592A JP H0643792 A JPH0643792 A JP H0643792A
- Authority
- JP
- Japan
- Prior art keywords
- roller
- cleaning
- cleaning roller
- weight
- conductive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Cleaning In Electrography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は電子写真装置用クリーニ
ング・ローラに関し、詳しくは、長期にわたつて安定し
て感光体の表面の残留トナーを除去することができる補
助的なクリーニング手段としてのクリーニング・ローラ
を提供することを目的とする。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning roller for an electrophotographic apparatus, and more particularly to a cleaning roller as an auxiliary cleaning means capable of stably removing residual toner on the surface of a photosensitive member over a long period of time. -The purpose is to provide rollers.
【０００２】[0002]
【従来の技術】従来、普通紙を記録紙として用いる静電
式電子写真装置によれば、一般に、感光体の表面に放電
により静電荷を与え、その上に画像を露光して静電潜像
を形成し、次に、逆極性を帯びたトナーを静電潜像に付
着させて現像し、そのトナー像を記録紙に転写し、最後
に、トナー像が転写された記録紙を加熱加圧し、トナー
を記録紙上に定着させることによつて複写を行なう。2. Description of the Related Art Conventionally, in an electrostatic type electrophotographic apparatus which uses plain paper as a recording paper, an electrostatic latent image is generally formed by applying an electrostatic charge to the surface of a photoconductor by discharging and exposing an image thereon. Then, the toner having the opposite polarity is adhered to the electrostatic latent image to develop it, the toner image is transferred to the recording paper, and finally the recording paper on which the toner image is transferred is heated and pressed. , Copying is performed by fixing the toner on the recording paper.
【０００３】従つて、複数枚の記録紙に順次複写を行な
うためには、上記工程において、感光体より記録紙にト
ナー像を転写した後、感光体の表面に残留するトナーを
除去する必要があり、その除去方式の一つとして、クリ
ーニング・ブレードを感光体表面に圧接し、感光体を摺
擦してクリーニングするブレード・クリーニング方式が
知られている。この方式のためのブレードには、特に、
耐摩耗性等の機械的強度がすぐれていることから、ポリ
ウレタンエラストマーからなる成形物が好ましく用いら
れている。Therefore, in order to sequentially make a copy on a plurality of recording sheets, it is necessary to remove the toner remaining on the surface of the photosensitive member in the above process after transferring the toner image from the photosensitive member to the recording sheet. As one of the removing methods, there is known a blade cleaning method in which a cleaning blade is brought into pressure contact with the surface of the photoconductor and the photoconductor is rubbed to clean. Blades for this method include,
A molded product made of a polyurethane elastomer is preferably used because it has excellent mechanical strength such as abrasion resistance.
【０００４】しかし、感光体のクリーニングをクリーニ
ング・ブレードのみにて行なうときは、クリーニング・
ブレードにかかる負荷が大きく、寿命が短いので、従
来、クリーニング・ブレードにて感光体の表面を摺擦す
る前に、補助的なクリーニング手段によつて、感光体の
表面から残留トナーを予備的に除去する方式が採用され
ている。However, when cleaning the photosensitive member only with the cleaning blade, the cleaning
Since the load on the blade is large and the life is short, conventionally, before the cleaning blade rubs the surface of the photoconductor, the auxiliary cleaning means preliminarily removes the residual toner from the surface of the photoconductor. The removal method is adopted.
【０００５】かかる補助的なクリーニング手段として
は、例えば、フアーブラシ、弾性発泡体、弾性体、磁気
ブラシ等が知られている。しかし、フアーブラシは、長
期使用によつてへたりが生じて、クリーニングの信頼性
に劣り、弾性発泡体は強度が十分でなく、長期使用によ
つて摩耗し、弾性体は感光体との摩擦係数が高く、フイ
ルミイングを生じやすい等の問題がある。磁気ブラシの
採用は装置を大型化するので、電子写真装置を高価なも
のにする。Known examples of such auxiliary cleaning means include a fur brush, an elastic foam, an elastic body, and a magnetic brush. However, the fur brush suffers from fatigue due to long-term use and is inferior in cleaning reliability.The elastic foam does not have sufficient strength and is worn due to long-term use, and the elastic body has a coefficient of friction with the photoconductor. However, there is a problem that filming is likely to occur. The adoption of the magnetic brush enlarges the apparatus, which makes the electrophotographic apparatus expensive.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、従来の電子
写真装置用の補助的なクリーニング手段における上記し
たような問題を解決するためになされたものであつて、
長期にわたつて安定して感光体の表面の残留トナーを除
去することができる補助的なクリーニング手段としての
クリーニング・ローラを提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the conventional auxiliary cleaning means for an electrophotographic apparatus.
An object of the present invention is to provide a cleaning roller as an auxiliary cleaning means capable of stably removing the residual toner on the surface of the photoconductor over a long period of time.
【０００７】[0007]
【課題を解決するための手段】本発明による電子写真装
置用クリーニング・ローラは、硬度１０〜４０、体積抵
抗率１０5 〜１０9 Ω・cmを有するポリウレタンエラス
トマーからなる基材の表面に、研磨剤粒子を含む導電性
塗膜が形成されていることを特徴とする。本発明におい
て、硬度は、ＪＩＳ Ａ硬度を意味する。A cleaning roller for an electrophotographic apparatus according to the present invention comprises a polyurethane elastomer having a hardness of 10 to 40 and a volume resistivity of 10 5 to 10 9 Ω · cm. It is characterized in that a conductive coating film containing agent particles is formed. In the present invention, the hardness means JIS A hardness.
【０００８】本発明によるクリーニング・ローラにおい
て、基材は、ポリウレタンエラストマーからなり、感光
体にある程度の面積をもつて接触すると共に、その際に
感光体を傷付けないように、その硬度は、１０〜４０の
範囲の低硬度であることが必要である。反対に、このよ
うに、ポリウレタンエラストマーからなるローラを感光
体にある程度の面積をもつて接触させることによつて、
クリーニングするので、その製作に際して、ローラの寸
法精度を高いレベルのものとする必要がなく、製作上、
有利である。In the cleaning roller according to the present invention, the base material is made of polyurethane elastomer and has a hardness of 10 to 10 so as not to damage the photoreceptor while contacting the photoreceptor with a certain area. It should have a low hardness in the range of 40. On the contrary, by bringing the roller made of polyurethane elastomer into contact with the photosensitive member over a certain area,
Since it is cleaned, it is not necessary to make the dimensional accuracy of the roller at a high level in the production, and
It is advantageous.
【０００９】かかるポリウレタンエラストマーからなる
ローラをそのまま、感光体の表面に接触させるときは、
ローラと感光体との摩擦係数が高く、感光体を回転させ
るために高トルクを必要とし、また、感光体の表面にフ
イルミングを生じやすい。そこで、本発明によれば、上
記のような低硬度のポリウレタンエラストマーからなる
基材の表面に研磨剤粒子を分散させた塗膜を形成させ、
更に、その塗膜を導電性とする。このように、ローラの
表面に塗膜を形成し、その塗膜中に研磨剤粒子を分散さ
せることによつて、そのような研磨剤粒子は、感光体の
表面を常に研磨しつつ、残留トナーを除去する。また、
ローラ基材及びその表面の塗膜共に導電性とすることに
よつて、ローラの摩擦による静電気の発生を防止するこ
とができ、ローラにトナーが付着しない。When the roller made of such a polyurethane elastomer is brought into contact with the surface of the photoreceptor as it is,
The friction coefficient between the roller and the photoconductor is high, high torque is required to rotate the photoconductor, and filming is likely to occur on the surface of the photoconductor. Therefore, according to the present invention, a coating film in which abrasive particles are dispersed is formed on the surface of a substrate made of a polyurethane elastomer having a low hardness as described above,
Further, the coating film is made conductive. Thus, by forming a coating film on the surface of the roller and dispersing the abrasive particles in the coating film, such abrasive particles can be used to remove residual toner particles while constantly polishing the surface of the photoreceptor. To remove. Also,
By making both the roller base material and the coating film on the surface thereof conductive, it is possible to prevent generation of static electricity due to friction of the roller, and toner does not adhere to the roller.
【００１０】本発明において、研磨剤粒子としては、特
に限定されるものではないが、シリカ、アルミナ等や、
その他の金属酸化物が好ましく用いられる。また、塗料
のビヒクルは、耐摩耗性にすぐれると共に、基材とのな
じみにすぐれるように、ポリウレタン樹脂であることが
好ましい。一般に、研磨剤粒子を基材であるポリウレタ
ンエラストマー自体に均一に分散させることは容易では
なく、また、分散させることができても、ポリウレタン
エラストマーの永久歪等の特性を相当に損なう。しか
し、本発明によれば、研磨剤粒子を分散させた塗料を基
材の表面に塗布し、塗膜を形成させ、この塗膜中に研磨
剤粒子を分散させているので、基材であるポリウレタン
エラストマーの特性を損なうことがない。In the present invention, the abrasive particles are not particularly limited, but include silica, alumina and the like,
Other metal oxides are preferably used. In addition, the vehicle of the coating material is preferably a polyurethane resin so that it has excellent abrasion resistance and is compatible with the base material. Generally, it is not easy to uniformly disperse the abrasive particles in the polyurethane elastomer itself, which is the base material, and even if the abrasive particles can be dispersed, the properties such as permanent set of the polyurethane elastomer are considerably impaired. However, according to the present invention, the coating material in which the abrasive particles are dispersed is applied to the surface of the base material to form a coating film, and the abrasive particle is dispersed in the coating film, which is a base material. It does not impair the properties of the polyurethane elastomer.
【００１１】導電性塗膜を形成するには、塗料に導電性
粒子を配合してなる導電性塗料が用いられる。導電性粒
子としては、例えば、導電性カーボン、金属酸化物、界
面活性剤等が好適であるが、特に、導電性カーボンが好
ましく用いられる。To form a conductive coating film, a conductive coating material prepared by mixing conductive particles in the coating material is used. As the conductive particles, for example, conductive carbon, metal oxides, surfactants and the like are suitable, but conductive carbon is particularly preferably used.
【００１２】[0012]
【発明の効果】以上のように、本発明による電子写真装
置用クリーニング・ローラは、表面に研磨剤粒子を含む
塗膜を有し、この研磨剤が感光体の表面を常に研磨しつ
つ、残留トナーを除去すると共に、ローラ基材及びその
表面の塗膜共に導電性であるから、ローラの摩擦による
静電気の発生を防止することができ、ローラにトナーが
付着しない。かくして、本発明のクリーニング・ローラ
によれば、長期にわたつて安定して感光体の表面のクリ
ーニングを行なうことができ、延いては、クリーニング
・ブレードの寿命を長くすることができる。As described above, the cleaning roller for an electrophotographic apparatus according to the present invention has a coating film containing abrasive particles on the surface thereof, and the abrasive agent remains on the surface of the photoconductor while always polishing it. At the same time as removing the toner, since the roller base material and the coating film on the surface thereof are conductive, it is possible to prevent generation of static electricity due to friction of the roller, and the toner does not adhere to the roller. Thus, according to the cleaning roller of the present invention, the surface of the photosensitive member can be stably cleaned over a long period of time, and the life of the cleaning blade can be extended.
【００１３】[0013]
【実施例】以下に実施例を挙げて本発明を説明するが、
本発明はこれら実施例により何ら限定されるものではな
い。The present invention will be described below with reference to examples.
The present invention is not limited to these examples.
【００１４】実施例１ ポリウレタン主剤として、ニツポランＮ４０３２（日本
ポリウレタン工業（株）製ポリエステルポリオール）１
００重量部に導電性カーボン１重量部を配合したものを
予め１４０℃で１２時間減圧脱泡し、これを１１０℃に
調整した。この主剤１００重量部にコロネートＴ−８０
（日本ポリウレタン工業（株）製ＴＤＩ−８０）７重量
部を硬化剤として加え、空気を巻き込まないように、十
分に注意しながら、数分間、激しく混合し、これを芯金
を挿入した１１０℃の金型中に注入し、２時間硬化させ
た。次いで、得られた硬化物を金型から取り出した後、
更に１１０℃で１６時間加熱して二次架橋させて、導電
性ポリウレタンからなるローラを得た。この導電性ロー
ラは、硬度２５、体積抵抗率５×１０5 Ω・cmであつ
た。この導電性ローラの外径を所定の寸法に研磨した。Example 1 Nituporan N4032 (polyester polyol manufactured by Nippon Polyurethane Industry Co., Ltd.) 1 was used as the main component of polyurethane.
A mixture of 00 parts by weight and 1 part by weight of conductive carbon was degassed under reduced pressure at 140 ° C. for 12 hours in advance and adjusted to 110 ° C. Coronate T-80 is added to 100 parts by weight of this main agent.
7 parts by weight of TDI-80 (manufactured by Nippon Polyurethane Industry Co., Ltd.) was added as a curing agent, and the mixture was vigorously mixed for several minutes while paying careful attention so that air was not entrained therein. It was poured into a mold and cured for 2 hours. Then, after removing the obtained cured product from the mold,
Further, it was heated at 110 ° C. for 16 hours for secondary cross-linking to obtain a roller made of conductive polyurethane. This conductive roller had a hardness of 25 and a volume resistivity of 5 × 10 5 Ω · cm. The outer diameter of this conductive roller was ground to a predetermined size.
【００１５】導電性塗料（大日精化工業（株）製セイカ
セブンＣＤ−７２７）の固形分１００重量部に対して一
次粒子径約１６μｍのシリカ５重量部を加え、ボールミ
ルで１２時間攪拌した。このようにして調製した塗料を
スプレーを用いて上記ローラの表面に膜厚３０〜７０μ
ｍとなるように均一に塗布し、常温で１２時間乾燥させ
た後、１００℃で約３０分間加熱硬化させ、本発明によ
るクリーニング・ローラを得た。このローラの体積抵抗
率は3.０×１０4 Ω・cmであつた。5 parts by weight of silica having a primary particle diameter of about 16 μm was added to 100 parts by weight of the solid content of the conductive paint (Seika Seven CD-727 manufactured by Dainichiseika Kogyo Co., Ltd.), and the mixture was stirred with a ball mill for 12 hours. The paint thus prepared was sprayed onto the surface of the roller to give a film thickness of 30 to 70 μm.
m to give a uniform coating, dried at room temperature for 12 hours, and then heat-cured at 100 ° C. for about 30 minutes to obtain a cleaning roller according to the present invention. The volume resistivity of this roller was 3.0 × 10 4 Ω · cm.
【００１６】実施例２ 実施例１において、導電性塗料の固形分１００重量部に
対して、シリカ１重量部を配合した以外は、同様にし
て、クリーニング・ローラを得た。 実施例３ 実施例１において、導電性塗料の固形分１００重量部に
対して、シリカ１０重量部を配合した以外は、同様にし
て、クリーニング・ローラを得た。 実施例４ 実施例１において、主剤１００重量部に対して硬化剤6.
０重量部用いた以外は、同様にして、クリーニング・ロ
ーラを得た。 実施例５ 実施例１において、主剤１００重量部に対して硬化剤8.
５重量部用いた以外は、同様にして、クリーニング・ロ
ーラを得た。 実施例６ 実施例１において、主剤１００重量部に導電性カーボン
0.５重量部を配合した以外は、同様にして、クリーニン
グ・ローラを得た。Example 2 A cleaning roller was obtained in the same manner as in Example 1 except that 1 part by weight of silica was added to 100 parts by weight of the solid content of the conductive coating material. Example 3 A cleaning roller was obtained in the same manner as in Example 1 except that 10 parts by weight of silica was added to 100 parts by weight of the solid content of the conductive paint. Example 4 In Example 1, a curing agent was added to 100 parts by weight of the main agent.
A cleaning roller was obtained in the same manner except that 0 part by weight was used. Example 5 In Example 1, a curing agent was added to 100 parts by weight of the main agent.
A cleaning roller was obtained in the same manner except that 5 parts by weight was used. Example 6 In Example 1, 100 parts by weight of the main agent was added to conductive carbon.
A cleaning roller was obtained in the same manner except that 0.5 part by weight was compounded.
【００１７】比較例１ 実施例１と同様にして、所定の外径を有する導電性ロー
ラとしたが、その表面に何ら塗膜を形成しなかつた。 比較例２ 実施例１と同様にして、所定の外径を有する導電性ロー
ラとし、その表面に研磨剤粒子を含まない導電性塗膜を
形成した。 比較例３ 実施例１において、導電性カーボンを含む主剤に更に研
磨剤１重量％を配合したもの１０重量部に対して硬化剤
７重量部を用いた以外は、同様にして、導電性ローラを
得た。その表面に何ら塗膜を形成しなかつた。 比較例４ 実施例１において、主剤に導電性カーボンを配合しなか
つた以外は、同様にして、クリーニング・ローラを得
た。 比較例５ 実施例１において、表面に形成する塗膜用塗料の導電性
カーボンを除いた絶縁性塗料（大日精化（株）製レザミ
ンＭＥ−８２３ＬＰ）を用いた以外は、同様にして、表
面を絶縁層としたクリーニング・ローラを得た。 比較例６ 実施例１において、主剤１００重量部に対して硬化剤１
０重量部を用いた以外は、同様にして、クリーニング・
ローラを得た。Comparative Example 1 A conductive roller having a predetermined outer diameter was prepared in the same manner as in Example 1, but no coating film was formed on the surface thereof. Comparative Example 2 In the same manner as in Example 1, a conductive roller having a predetermined outer diameter was formed, and a conductive coating film containing no abrasive particles was formed on the surface thereof. Comparative Example 3 A conductive roller was prepared in the same manner as in Example 1 except that 7 parts by weight of a curing agent was used with respect to 10 parts by weight of a main agent containing conductive carbon and 1% by weight of an abrasive. Obtained. No coating film was formed on the surface. Comparative Example 4 A cleaning roller was obtained in the same manner as in Example 1, except that conductive carbon was not added to the main component. Comparative Example 5 In the same manner as in Example 1, except that an insulating paint (Resamine ME-823LP manufactured by Dainichiseika Co., Ltd.) excluding conductive carbon of the paint for coating film formed on the surface was used, A cleaning roller having an insulating layer of was obtained. Comparative Example 6 In Example 1, 1 part by weight of the curing agent was added to 100 parts by weight of the main agent.
Cleaning was performed in the same manner except that 0 part by weight was used.
Got Laura.
【００１８】以上のようにして得たそれぞれのクリーニ
ング・ローラについて、その硬度、体積抵抗率及びクリ
ーニング性を調べた。クリーニング性は、市販の電子写
真装置にクリーニング・ローラを据え付けて、複写を連
続して行ない、複写画像における異常の有無及び感光体
上のフイルミングの有無を調べた。結果を表１及び表２
に示す。The hardness, volume resistivity and cleaning property of each cleaning roller thus obtained were examined. As for the cleaning property, a commercially available electrophotographic apparatus was equipped with a cleaning roller, and copying was continuously performed to examine whether or not there was an abnormality in a copied image and whether or not there was filming on the photoconductor. The results are shown in Table 1 and Table 2.
Shown in.
【００１９】[0019]
【表１】 [Table 1]
【００２０】[0020]
【表２】 [Table 2]
【００２１】表１及び２におけるクリーニング性の評価
は次のとおりである。 ａ：８０万枚の複写後も複写画像に異常が認められなか
つた。 ｂ：５０００枚の複写後に感光体にフイルミングが発生
した。 ｃ：１００００枚の複写後に感光体にフイルミングが発
生した。 ｄ：感光体の表面が均一にクリーニングされず、３００
０枚の複写によつて、クリーニング・ブレードに不均一
な摩耗がみられた。The evaluation of the cleaning property in Tables 1 and 2 is as follows. a: No abnormality was found in the copied image even after copying 800,000 sheets. b: Filming occurred on the photoconductor after copying 5000 sheets. c: Filming occurred on the photoconductor after copying 10,000 sheets. d: The surface of the photoconductor is not uniformly cleaned and is 300
Non-uniform wear was observed on the cleaning blade after 0 copies.
Claims (1)
9 Ω・cmを有するポリウレタンエラストマーからなる基
材の表面に、研磨剤粒子を含む導電性塗膜が形成されて
いることを特徴とする電子写真装置用クリーニング・ロ
ーラ。1. Hardness 10 to 40, volume resistivity 10 5 to 10
A cleaning roller for an electrophotographic apparatus, wherein a conductive coating film containing abrasive particles is formed on the surface of a substrate made of a polyurethane elastomer having 9 Ω · cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4157075A JP2631935B2 (en) | 1992-06-16 | 1992-06-16 | Cleaning roller for electrophotographic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4157075A JP2631935B2 (en) | 1992-06-16 | 1992-06-16 | Cleaning roller for electrophotographic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0643792A true JPH0643792A (en) | 1994-02-18 |
| JP2631935B2 JP2631935B2 (en) | 1997-07-16 |
Family
ID=15641697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4157075A Expired - Fee Related JP2631935B2 (en) | 1992-06-16 | 1992-06-16 | Cleaning roller for electrophotographic equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2631935B2 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57176083A (en) * | 1981-04-04 | 1982-10-29 | Copyer Co Ltd | Photoreceptor cleaning method of electrostatic copying machine |
| JPS6311982A (en) * | 1986-07-02 | 1988-01-19 | Sharp Corp | Picture forming device |
| JPS6438780A (en) * | 1987-08-05 | 1989-02-09 | Tokai Rubber Ind Ltd | Conductive roller |
| JPS6466674A (en) * | 1987-09-08 | 1989-03-13 | Tokai Rubber Ind Ltd | Conductive roll |
| JPS6490483A (en) * | 1987-09-30 | 1989-04-06 | Konishiroku Photo Ind | Image recorder |
-
1992
- 1992-06-16 JP JP4157075A patent/JP2631935B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57176083A (en) * | 1981-04-04 | 1982-10-29 | Copyer Co Ltd | Photoreceptor cleaning method of electrostatic copying machine |
| JPS6311982A (en) * | 1986-07-02 | 1988-01-19 | Sharp Corp | Picture forming device |
| JPS6438780A (en) * | 1987-08-05 | 1989-02-09 | Tokai Rubber Ind Ltd | Conductive roller |
| JPS6466674A (en) * | 1987-09-08 | 1989-03-13 | Tokai Rubber Ind Ltd | Conductive roll |
| JPS6490483A (en) * | 1987-09-30 | 1989-04-06 | Konishiroku Photo Ind | Image recorder |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2631935B2 (en) | 1997-07-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0478317B1 (en) | Apparatus for developing electrostatic latent image and developing roller therefor | |
| JP7394928B2 (en) | charging roll | |
| JP2022126823A (en) | charging roll | |
| JP2008209488A (en) | Charging device, process cartridge and image forming apparatus | |
| JP2022141842A (en) | Charging roller | |
| JP7337176B2 (en) | charging roll | |
| JP3539114B2 (en) | Developing roll and its manufacturing method | |
| JPH0643792A (en) | Cleaning roller for electrophotographic device | |
| WO2022018933A1 (en) | Conductive roll, image forming apparatus, and inspection method for conductive roll | |
| JP7337177B2 (en) | charging roll | |
| JPS59200284A (en) | Cleaning blade of photosensitive body in electrophotographic device | |
| JP2819611B2 (en) | Developing device and developer carrier used therein | |
| JP3024248B2 (en) | Charging roll | |
| JPWO2020175431A1 (en) | Charging roll | |
| WO2022163128A1 (en) | Charge roller | |
| JP3499689B2 (en) | Developing roller and developing device | |
| WO2022018934A1 (en) | Conductive roller | |
| JP2004109461A (en) | Process cartridge | |
| JP7429787B2 (en) | Conductive roll, image forming device, and conductive roll inspection method | |
| JP7342136B2 (en) | charging roll | |
| JP6642007B2 (en) | Image carrier protective agent, protective layer forming apparatus, image forming method, image forming apparatus, and process cartridge | |
| JPWO2020175430A1 (en) | Charging roll | |
| JP3179270B2 (en) | Charging member, method of manufacturing the same, and electrophotographic apparatus | |
| JPH06118662A (en) | Surface roughening treatment of electrophotographic sensitive body | |
| JP3147003B2 (en) | Developing roller and developing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090425 Year of fee payment: 12 |
|
| LAPS | Cancellation because of no payment of annual fees |