JP4807990B2 - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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JP4807990B2
JP4807990B2 JP2005263964A JP2005263964A JP4807990B2 JP 4807990 B2 JP4807990 B2 JP 4807990B2 JP 2005263964 A JP2005263964 A JP 2005263964A JP 2005263964 A JP2005263964 A JP 2005263964A JP 4807990 B2 JP4807990 B2 JP 4807990B2
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charging roller
cleaning member
resin foam
melamine resin
forming apparatus
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JP2007078838A (en
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崇 酒巻
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Ricoh Co Ltd
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Ricoh Co Ltd
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Description

本発明は、複写機、プリンタ等の画像形成装置に関し、帯電ローラ清掃部材を備える画像形成装置に関する。   The present invention relates to an image forming apparatus such as a copying machine and a printer, and more particularly to an image forming apparatus including a charging roller cleaning member.

近年、画像の高画質、高精細化の需要が高まり、現像工程においては、小粒径化、球形化されたトナーが使用されるようになってきている。このようなトナーを用いることで、静電潜像に緻密にトナーを付着させようというものである。
しかしながら、このような小粒径化、球形化されたトナーは、クリーニング工程において、クリーニングブレードをすり抜けやすく、クリーニング不良が生じやすくなる。そして、クリーニングされずに像担持体上に残留するトナーが帯電ローラに付着し、帯電ローラの表面の抵抗が上昇することで、帯電ローラの帯電能力が低下し、像担持体の均一な帯電が行えなくなり、画像としては地汚れとなって現れる。
したがって、残留トナーが帯電ローラに付着するのを防ぐため、帯電ローラ表面を清掃する帯電ローラ清掃部材が必要となる。 In recent years, there has been an increasing demand for high image quality and high definition of images, and in the development process, toner having a small particle size and a spherical shape has been used. By using such a toner, the toner is made to adhere precisely to the electrostatic latent image.
However, such a toner having a reduced particle size and a sphere is easy to slip through the cleaning blade in the cleaning process, and defective cleaning tends to occur. Then, the toner remaining on the image carrier without being cleaned adheres to the charging roller, and the resistance of the surface of the charging roller increases, so that the charging ability of the charging roller is reduced and the image carrier is uniformly charged. It becomes impossible to do so, and the image appears as dirt.
Accordingly, in order to prevent the residual toner from adhering to the charging roller, a charging roller cleaning member that cleans the surface of the charging roller is required.

帯電ローラ清掃部材としては、発泡ポリウレタン、発泡ポリエチレン等のスポンジ材やブラシローラ等（例えば、特許文献１参照。）が用いられている。帯電ローラの清掃は、芯金と芯金の外周に発泡体等で形成されたローラ状の帯電ローラ清掃部材を、帯電ローラに連れ回りさせて、帯電ローラに当接させ摺擦させることにより、像担持体の被帯電面からすり抜けた帯電ローラに付着した残留現像剤を除去する。残留現像剤は、帯電ローラ清掃部材が発泡体であれば、内部の気孔に溜め込まれ、ブラシローラであればブラシの繊維間に溜め込まれる。
しかしながら、これらのクリーニング部材に溜め込まれる付着物の量には限界があり、クリーニング部材のクリーニング性能を長期に渡って維持することには課題が残されている。 As the charging roller cleaning member, a sponge material such as foamed polyurethane or foamed polyethylene, a brush roller, or the like (see, for example, Patent Document 1) is used. Cleaning of the charging roller is performed by rotating a charging roller cleaning member formed of foam or the like on the outer periphery of the core metal and the core metal with the charging roller so that the charging roller comes into contact with and rubs . Residual developer adhering to the charging roller slipped from the surface to be charged of the image carrier is removed. If the charging roller cleaning member is a foam, the residual developer is stored in the internal pores, and if it is a brush roller, the residual developer is stored between the fibers of the brush.
However, there is a limit to the amount of deposits accumulated in these cleaning members, and there remains a problem in maintaining the cleaning performance of the cleaning member over a long period of time.

このような帯電ローラ清掃部材の問題を解決するために改良を進めている従来技術としては、感光体と、この感光体の表面を帯電させる帯電ローラと、この帯電ローラの表面に接触して当該帯電ローラの表面を清掃するクリーニング部材と、前記帯電ローラの帯電と同じ極性に前記クリーニング部材を帯電させる電源とを含む帯電ローラクリーニング機構（例えば、特許文献２参照。）が開示されている。
また、帯電ローラクリーニング機構は芯金の外周に少なくとも弾性層を設けてなり、密度５〜１５ｋｇ／ｍ３ 、引っ張り強度１．７±０．５ｋｇ／ｃｍ２ 、伸び率２０〜４０％の連続気泡構造を有する樹脂発泡体からなるクリーニングローラを備える帯電ローラクリーニング機構（例えば、特許文献３参照。）が開示されている。 Conventional techniques that have been improved in order to solve the problem of the charging roller cleaning member include a photosensitive member, a charging roller that charges the surface of the photosensitive member, and the surface of the charging roller in contact with the charging roller. A charging roller cleaning mechanism (for example, see Patent Document 2) including a cleaning member that cleans the surface of the charging roller and a power source that charges the cleaning member to the same polarity as the charging of the charging roller is disclosed.
Further, the charging roller cleaning mechanism is provided with at least an elastic layer on the outer periphery of the cored bar, and has a density of 5 to 15 kg / m 3 , a tensile strength of 1.7 ± 0.5 kg / cm 2 , and an open cell with an elongation of 20 to 40%. A charging roller cleaning mechanism (see, for example, Patent Document 3) including a cleaning roller made of a resin foam having a structure is disclosed.

特開平５−２９７６９０号公報JP-A-5-297690 特開２００２−１０８０６９号公報JP 2002-108069 A 特開２００４−３６１９１６号公報JP 2004-361916 A

しかしながら、特許文献１ないし３のいずれの開示技術でも、帯電ローラと帯電ローラ清掃部材が常時接触し連れ回りしていると、一度帯電ローラ清掃部材に溜め込まれた残留現像剤が帯電ローラとの連れ回りを繰り返すことにより、帯電ローラ表面にすり込まれてしまれてしまう場合があり、帯電ローラ清掃部材の性能を長期に渡って維持することができない。
上記問題点に鑑み、本発明は、帯電ローラと帯電ローラ清掃部材の接触確率を減少させることで、長期にわたって良好なクリーニング性を維持できる帯電ローラ清掃部材を備える画像形成装置を提供することを課題とする。 However, in any of the disclosed techniques of Patent Documents 1 to 3, if the charging roller and the charging roller cleaning member are always in contact with each other, the residual developer once accumulated in the charging roller cleaning member is brought with the charging roller. By repeating the rotation, the charging roller may be rubbed into the surface, and the performance of the charging roller cleaning member cannot be maintained for a long time.
In view of the above problems, it is an object of the present invention to provide an image forming apparatus including a charging roller cleaning member that can maintain good cleaning performance over a long period of time by reducing the contact probability between the charging roller and the charging roller cleaning member. And

上記課題を解決するため、本発明は以下の特徴を有している。本発明の画像形成装置は、被帯電面に現像剤像を担持する像担持体と、像担持体を帯電させる帯電ローラと、芯金とその芯金の外周に設けられたメラミン樹脂発泡体から形成され、帯電ローラと連れ回りをする帯電ローラ清掃部材とを備える画像形成装置であって、前記画像形成装置は、前記帯電ローラ清掃部材が、前記メラミン樹脂発泡体の溝がそのメラミン樹脂発泡体の両端部以外に設けられていることにより、前記帯電ローラとの連れ回りの際に前記帯電ローラと接触及び非接触を繰り返す構成になっていることを特徴とする。 In order to solve the above problems, the present invention has the following features. An image forming apparatus according to the present invention includes an image carrier that carries a developer image on a surface to be charged, a charging roller that charges the image carrier, a cored bar, and a melamine resin foam provided on the outer periphery of the cored bar. An image forming apparatus comprising a charging roller cleaning member that is formed and rotates together with the charging roller, wherein the charging roller cleaning member has a groove in the melamine resin foam. it allows characterized that it is the charging roller contact and configured to repeat the non-contact during the accompanying rotation of the front Symbol charging roller of provided other than both end portions.

また、本発明の画像形成装置は、さらに、前記帯電ローラ清掃部材のメラミン樹脂発泡体の溝が帯電ローラの長手方向に交互に配置されていることを特徴とする。 The image forming apparatus of the present invention is further characterized in that grooves of the melamine resin foam of the charging roller cleaning member are alternately arranged in the longitudinal direction of the charging roller.

上記課題を解決するための手段により、本発明の画像形成装置によれば、帯電ローラ清掃部材が帯電ローラと連れ回りをする際に、帯電ローラと接触及び非接触を繰り返す構成にすることで、帯電ローラと帯電ローラ清掃部材のメラミン樹脂発泡体との接触確率が減少するので、メラミン樹脂発泡体に溜め込まれた残留現像剤が帯電ローラにすり込まれないようにすることができる。
帯電ローラ清掃部材の両端部以外に溝を設けて、帯電ローラと接触及び非接触を繰り返す構成にすることで、メラミン樹脂発泡体に溜め込まれた残留現像剤が帯電ローラにすり込まれないようにすることができる。
また、メラミン樹脂発泡体の溝を帯電ローラの長手方向に交互に配置することにより、帯電ローラ清掃部材の両端部のメラミン樹脂発泡体にも溝を作れるので、帯電ローラとの安定した連れ回りができるようになる。さらに、帯電ローラ端部もメラミン樹脂発泡体に溜め込まれた残留現像剤が帯電ローラにすり込まれないようにすることができる。
また、メラミン樹脂発泡体の溝をらせん状に配置することにより、上述したメラミン樹脂発泡体の溝が帯電ローラの長手方向に交互に配置されている構成の帯電ローラ清掃部材よりも、さらに安定した連れ回りができるようになる。 According to the means for solving the above problem, according to the image forming apparatus of the present invention, when the charging roller cleaning member rotates with the charging roller, the charging roller cleaning member repeats contact and non-contact with the charging roller. Since the contact probability between the charging roller and the melamine resin foam of the charging roller cleaning member is reduced, the residual developer stored in the melamine resin foam can be prevented from being rubbed into the charging roller.
By providing grooves other than both ends of the charging roller cleaning member and repeating contact and non-contact with the charging roller, the residual developer accumulated in the melamine resin foam is not rubbed into the charging roller. can do.
In addition, by alternately arranging the grooves of the melamine resin foam in the longitudinal direction of the charging roller, grooves can also be formed in the melamine resin foam at both ends of the charging roller cleaning member, so that stable rotation with the charging roller is possible. become able to. Further, the end portion of the charging roller can be prevented from being rubbed into the charging roller by the residual developer stored in the melamine resin foam.
Further, by arranging the grooves of the melamine resin foam in a spiral shape, the above-described grooves of the melamine resin foam are more stable than the charging roller cleaning member having a configuration in which the grooves are alternately arranged in the longitudinal direction of the charging roller. You can go around.

以下に、本発明を実施するための最良の形態を、図１から図４に基づいて説明する。ただし、これらは一実施形態にすぎず、本発明の特許請求の範囲を限定するものではない。   The best mode for carrying out the present invention will be described below with reference to FIGS. However, these are merely embodiments, and do not limit the scope of the claims of the present invention.

図１は、本発明の画像形成装置の帯電ローラ清掃部材周辺の主要断面図である。１は像担持体、２は帯電ローラであり、３は帯電ローラ清掃部材を示している。 FIG. 1 is a main cross-sectional view around the charging roller cleaning member of the image forming apparatus of the present invention. 1 image carrier, 2 denotes a charging roller, 3 that shows the charging roller cleaning member.

（実施例１）
図２は、本発明の帯電ローラ清掃部材のメラミン樹脂発泡体の溝がそのメラミン樹脂発泡体の両端部以外に設けられている例を長手方向から見た図である。４は帯電ローラに残留現像剤が付着することを防止する芯金、５は芯金の外周に接着したメラミン樹脂発泡体で、帯電ローラ清掃部材３は芯金４とメラミン樹脂発泡体５から形成される。６はメラミン樹脂発泡体５に設けられた溝を示すが、メラミン樹脂発泡体５の両端部１０ｍｍの間には溝６を設けていない。メラミン樹脂発泡体５の両端部に溝６を設けないことで、帯電ローラ清掃部材３と帯電ローラ２との連れ回りが可能となる。
帯電ローラ清掃部材３は、帯電ローラ２との連れ回りの際に、帯電ローラ２に接触、非接触を繰り返すような構成になっている。帯電ローラ清掃部材３の外周のメラミン樹脂発泡体５に溜め込まれた残留現像剤が常時帯電ローラ２に接触していると、その残留現像剤が帯電ローラ２に逆にすり込まれ、帯電ローラ２に残留現像剤が固着してしまう。これを防止するために帯電ローラ２と帯電ローラ清掃部材３との接触確率はある程度少ないほうが良い。 (Example 1)
FIG. 2 is a view of an example in which the groove of the melamine resin foam of the charging roller cleaning member of the present invention is provided in the longitudinal direction other than both ends of the melamine resin foam. 4 is a metal core for preventing the residual developer from adhering to the charging roller, 5 is a melamine resin foam adhered to the outer periphery of the metal core, and the charging roller cleaning member 3 is formed of the metal core 4 and the melamine resin foam 5. Is done. Although 6 shows the groove | channel provided in the melamine resin foam 5, the groove | channel 6 is not provided between the both ends 10mm of the melamine resin foam 5. FIG. By not providing the grooves 6 at both ends of the melamine resin foam 5, the charging roller cleaning member 3 and the charging roller 2 can be rotated together.
The charging roller cleaning member 3 is configured to repeat contact and non-contact with the charging roller 2 when the charging roller 2 rotates with the charging roller 2. If the residual developer stored in the melamine resin foam 5 on the outer periphery of the charging roller cleaning member 3 is always in contact with the charging roller 2, the residual developer is rubbed back into the charging roller 2, and the charging roller 2. Residual developer adheres to the surface. In order to prevent this, the contact probability between the charging roller 2 and the charging roller cleaning member 3 should be small to some extent.

下記表１は、メラミン樹脂発泡体５に溝６がない帯電ローラ清掃部材３と、本発明のメラミン樹脂発泡体５に溝６がある帯電ローラ清掃部材３とをそれぞれ画像形成装置に搭載し、帯電ローラ汚れ評価のランニング試験を行った結果である。帯電ローラ汚れに伴う地汚れランクを１〜５とし、帯電ローラ汚れに伴う地汚れが全くないもの（初期）をランク５とし、地汚れが最も顕著なものをランク１とした。
メラミン樹脂発泡体５に溝６がない帯電ローラ清掃部材３でランニングした帯電ローラ２では、３００００枚程度通紙した段階で、帯電ローラ２の帯電不良に伴う顕著な地汚れが発生した。それに対し、本発明のメラミン樹脂発泡体５に溝６がある帯電ローラ清掃部材３でランニングした帯電ローラ２では、６００００枚通紙しても帯電ローラ２の帯電不良に伴う地汚れは、ほとんど発生しなかった。このことから、帯電ローラ清掃部材３に溝を設け、帯電ローラ２と帯電ローラ清掃部材３の接触確率をある程度低減させることで、長期にわたって良好なクリーニング性を有する帯電ローラ清掃部材３を備える画像形成装置が提供できることが分かった。

Figure 0004807990
Table 1 below shows that the charging roller cleaning member 3 having no groove 6 in the melamine resin foam 5 and the charging roller cleaning member 3 having the groove 6 in the melamine resin foam 5 of the present invention are mounted on the image forming apparatus, respectively. It is the result of having performed the running test of charging roller dirt evaluation. The dirt rank associated with the charging roller dirt was set to 1 to 5, the dirt free from the dirt due to the charging roller dirt (initial stage) was assigned to rank 5, and the dirt having the most noticeable dirt was assigned to rank 1.
In the charging roller 2 running with the charging roller cleaning member 3 having no groove 6 in the melamine resin foam 5, noticeable scumming due to charging failure of the charging roller 2 occurred when about 30000 sheets were passed. On the other hand, in the charging roller 2 that is run by the charging roller cleaning member 3 having the groove 6 in the melamine resin foam 5 of the present invention, even if 60000 sheets are passed, the soiling due to the charging failure of the charging roller 2 almost occurs. I did not. For this reason, a groove is provided in the charging roller cleaning member 3 to reduce the contact probability between the charging roller 2 and the charging roller cleaning member 3 to some extent, thereby forming an image having the charging roller cleaning member 3 having good cleaning properties over a long period of time. It turns out that the device can provide.
Figure 0004807990

（実施例２）
図３は、本発明の帯電ローラ清掃部材のメラミン樹脂発泡体の溝が帯電ローラの長手方向に交互に配置されている例を示した図である。図３に示すように、帯電ローラ清掃部材３のメラミン樹脂発泡体５の溝を交互に配置することで、帯電ローラ清掃部材３の端部に溝を設けても、帯電ローラ２との連れ回りが可能となった。また、図２に示したメラミン樹脂発泡体５の溝がそのメラミン樹脂発泡体５の両端部以外に設けられている構成の帯電ローラ清掃部材３よりも、安定して連れ回りができるようになった。さらに、帯電ローラ清掃部材３の両端部のメラミン樹脂発泡体５にも溝６を作れるので、帯電ローラ端部もメラミン樹脂発泡体５に溜め込まれた残留現像剤が帯電ローラ２にすり込まれないようにすることができる。 (Example 2)
FIG. 3 is a view showing an example in which the grooves of the melamine resin foam of the charging roller cleaning member of the present invention are alternately arranged in the longitudinal direction of the charging roller. As shown in FIG. 3, by alternately arranging the grooves of the melamine resin foam 5 of the charging roller cleaning member 3, even if a groove is provided at the end of the charging roller cleaning member 3, the charging roller 2 is rotated together. Became possible. Further, the charging roller cleaning member 3 having a configuration in which the grooves of the melamine resin foam 5 shown in FIG. 2 are provided at portions other than both ends of the melamine resin foam 5 can be rotated with stability. It was. Further, since the groove 6 can be formed also in the melamine resin foam 5 at both ends of the charging roller cleaning member 3, the residual developer stored in the melamine resin foam 5 at the end of the charging roller is not rubbed into the charging roller 2. Ru can be so.

（実施例３）
図４は、本発明の帯電ローラ清掃部材のメラミン樹脂発泡体の溝がらせん状に配置されている例を長手方向から見た図である。図４に示すように、帯電ローラ清掃部材３のメラミン樹脂発泡体５の溝をらせん状に配置することで、図３と同じように、帯電ローラ清掃部材３の端部に溝を設けても、帯電ローラ２との連れ回りが可能となった。また、メラミン樹脂発泡体５の溝６をらせん状にすることで、図３のメラミン樹脂発泡体５の溝６が帯電ローラ２の長手方向に交互に配置されている構成の帯電ローラ清掃部材３よりも、さらに安定した連れ回りができるようになった。 Example 3
FIG. 4 is a view of an example in which the grooves of the melamine resin foam of the charging roller cleaning member of the present invention are arranged in a spiral shape when viewed from the longitudinal direction. As shown in FIG. 4, the grooves of the melamine resin foam 5 of the charging roller cleaning member 3 are arranged in a spiral shape so that grooves can be provided at the end of the charging roller cleaning member 3 as in FIG. 3. Then, the rotation with the charging roller 2 became possible. Further, by forming the grooves 6 of the melamine resin foam 5 in a spiral shape, the charging roller cleaning member 3 having a configuration in which the grooves 6 of the melamine resin foam 5 of FIG. 3 are alternately arranged in the longitudinal direction of the charging roller 2. Than ever before.

本発明の画像形成装置の帯電ローラ清掃部材周辺の主要断面図である。FIG. 3 is a main cross-sectional view around a charging roller cleaning member of the image forming apparatus of the present invention. 本発明の帯電ローラ清掃部材のメラミン樹脂発泡体の溝がそのメラミン樹脂 発泡体の両端部以外に設けられている例を長手方向から見た図である。It is the figure which looked at the example from which the groove | channel of the melamine resin foam of the charging roller cleaning member of this invention was provided other than the both ends of the melamine resin foam from the longitudinal direction. 本発明の帯電ローラ清掃部材のメラミン樹脂発泡体の溝が帯電ローラの長手 方向に交互に配置されている例を示した図である。FIG. 4 is a view showing an example in which grooves of a melamine resin foam of the charging roller cleaning member of the present invention are alternately arranged in the longitudinal direction of the charging roller. 本発明の帯電ローラ清掃部材のメラミン樹脂発泡体の溝がらせん状に配置さ れている例を長手方向から見た図である。FIG. 3 is a view of an example in which grooves of a melamine resin foam of a charging roller cleaning member of the present invention are arranged in a spiral shape when viewed from the longitudinal direction.

符号の説明Explanation of symbols

１ 像担持体
２ 帯電ローラ
３ 帯電ローラ清掃部材
４ 芯金
５ メラミン樹脂発泡体
６ 溝 DESCRIPTION OF SYMBOLS 1 Image carrier 2 Charging roller 3 Charging roller cleaning member 4 Core metal 5 Melamine resin foam 6 Groove

Claims (2)

被帯電面に現像剤像を担持する像担持体と、
像担持体を帯電させる帯電ローラと、
芯金とその芯金の外周に設けられたメラミン樹脂発泡体から形成され、帯電ローラと連れ回りをする帯電ローラ清掃部材とを備える画像形成装置であって、
前記画像形成装置は、前記帯電ローラ清掃部材が、前記メラミン樹脂発泡体の溝がそのメラミン樹脂発泡体の両端部以外に設けられていることにより、前記帯電ローラとの連れ回りの際に前記帯電ローラと接触及び非接触を繰り返す構成になっている
ことを特徴とする画像形成装置。 An image carrier that carries a developer image on a surface to be charged;
A charging roller for charging the image carrier;
An image forming apparatus including a cored bar and a charging roller cleaning member that is formed from a melamine resin foam provided on an outer periphery of the cored bar and rotates together with the charging roller,
Wherein the image forming apparatus, the charging roller cleaning member, by the grooves of the melamine resin foam is provided in addition to both ends of the melamine resin foam, said during accompanying rotation of the front Stories charging roller An image forming apparatus characterized by being configured to repeat contact and non-contact with a charging roller. 前記画像形成装置は、前記帯電ローラ清掃部材のメラミン樹脂発泡体の溝が帯電ローラの長手方向に交互に配置されている
ことを特徴とする請求項１に記載の画像形成装置。 The image forming apparatus according to claim 1, wherein grooves of the melamine resin foam of the charging roller cleaning member are alternately arranged in a longitudinal direction of the charging roller .
JP2005263964A 2005-09-12 2005-09-12 Image forming apparatus Expired - Fee Related JP4807990B2 (en)

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Publication number Priority date Publication date Assignee Title
JP5621293B2 (en) 2010-03-26 2014-11-12 富士ゼロックス株式会社 Image forming apparatus and image forming method, and cleaning apparatus and cleaning method
JP5429095B2 (en) * 2010-07-29 2014-02-26 コニカミノルタ株式会社 Cleaning roller and image forming apparatus provided with the cleaning roller
JP5423607B2 (en) * 2010-07-29 2014-02-19 コニカミノルタ株式会社 Cleaning roller and image forming apparatus provided with the cleaning roller
JP5533521B2 (en) * 2010-09-30 2014-06-25 富士ゼロックス株式会社 Charging device, method of manufacturing charging device, process cartridge, and image forming apparatus

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JPH07134511A (en) * 1993-11-12 1995-05-23 Mita Ind Co Ltd Cleaning device for fixing roller
JPH0883030A (en) * 1994-09-09 1996-03-26 Canon Inc Cleaning device
JPH08137208A (en) * 1994-11-11 1996-05-31 Canon Inc Cleaning device for electrifying roller in image forming device
JP2834716B2 (en) * 1996-11-20 1998-12-14 ミツマ技研株式会社 Manufacturing method of cleaning roller and toner supply roller
JP3893225B2 (en) * 1998-10-08 2007-03-14 キヤノン株式会社 Developing device and image forming apparatus
JP2004361916A (en) * 2003-05-12 2004-12-24 Ricoh Co Ltd Charging roller cleaning mechanism, process cartridge and image forming apparatus

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