JP2018013565A - Electrification device and image formation apparatus - Google Patents

Electrification device and image formation apparatus Download PDF

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JP2018013565A
JP2018013565A JP2016142101A JP2016142101A JP2018013565A JP 2018013565 A JP2018013565 A JP 2018013565A JP 2016142101 A JP2016142101 A JP 2016142101A JP 2016142101 A JP2016142101 A JP 2016142101A JP 2018013565 A JP2018013565 A JP 2018013565A
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charging
bearing
electrification
cleaning
rotating
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JP6677908B2 (en
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響 佐々木
Hibiki Sasaki
響 佐々木
佐藤　弘一
Koichi Sato
弘一 佐藤
高島　義行
Yoshiyuki Takashima
義行 高島
正 須藤
Tadashi Sudo
正 須藤
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Fujifilm Business Innovation Corp
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Fuji Xerox Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an electrification device and image formation apparatus which have the light load in a bearing member even when deflection and inclination occur in a shaft.SOLUTION: An electrification device includes: an electrification member which has a rotational shaft extending along an electrification object body and electrifies the electrification object body while rotating by being in contact with the electrification object body; a cleaning member which has a rotational shaft extending along the electrification member and cleans the electrification member while rotating by being in contact with the electrification member; a plurality of bearing members which rotatably support the respective shafts of the electrification member and the cleaning member individually; a holding member which holds the plurality of bearing members and holds a distance between the rotational shafts of the electrification member and the cleaning member; a protrusion part which annularly protrudes from the outer peripheral surface of the bearing member by surrounding the rotational shaft, and in which the posture of the bearing member changes with a contact spot contacting the inner peripheral surface of the holding member as a fulcrum; and a rotation stop part which protrudes from a spot connected to the protrusion part of the bearing member and stops rotation of the bearing member contacting the holding member with respect to the holding member.SELECTED DRAWING: Figure 3

Description

本発明は、帯電装置および画像形成装置に関する。   The present invention relates to a charging device and an image forming apparatus.

従来、帯電装置を備えた画像形成装置として、例えば特許文献１，２に記載の装置が知られている。   Conventionally, as an image forming apparatus provided with a charging device, for example, devices described in Patent Documents 1 and 2 are known.

特許文献１には、感光体ドラム１２に圧接し従動回転して帯電させる帯電ロール１４と、帯電ロール１４に圧接し従動回転してクリーニングするスポンジ部材１００とを、軸受け部材１１０によりそれぞれ回転可能に支持するとともに、この軸受け部材１１０に形成するスポンジ部材１００の軸受け部は、スポンジ部材１００のシャフト１００Ａの軸径よりも大径の軸受け孔１１４として、シャフト１００Ａの支持部１００ａに対し帯電ロール１４への圧接方向に自由度を与える技術が開示されている。圧接力によりスポンジ部材１００に撓みが生じても、支持部１００ａが軸受け孔１１４に支持された状態で帯電ロール１４への圧接方向に自由に変位及び変形できるため、接触圧の上昇による回転抵抗の増加が抑えられる。   In Patent Document 1, a charging roll 14 that is pressed against a photosensitive drum 12 and driven to rotate and charged, and a sponge member 100 that is pressed against the charging roll 14 and driven to rotate and cleaned are rotatable by a bearing member 110. The bearing portion of the sponge member 100 formed on the bearing member 110 is supported as a bearing hole 114 having a diameter larger than the shaft diameter of the shaft 100A of the sponge member 100 to the charging roll 14 with respect to the support portion 100a of the shaft 100A. A technique for providing a degree of freedom in the direction of pressure contact is disclosed. Even if the sponge member 100 is bent due to the pressure contact force, the support member 100a can be freely displaced and deformed in the direction of pressure contact with the charging roll 14 while being supported by the bearing hole 114. Increase is suppressed.

特許文献２には、帯電ローラ等のローラ状の印加部材に撓みが生じないようにしてバイアス印加不良の発生を防止するため、帯電ローラ（ローラ状の印加部材）４０の両端寄り周面に、例えば熱収縮チューブにより形成して凸部４３を設け、帯電ローラは、各凸部位置をそれぞれ２つの転動部材４４間に入れてそれらで挟み、転動部材を介して保持し、両転動部材は、ローラ状で、それらの軸を平行としてホルダ４５で回転自在に支持し、そして、ホルダに付勢部材４６を押し当ててその付勢部材による付勢方向を凸部に向け、その凸部に向かう付勢部材の付勢力Ｆで転動部材を付勢して凸部を介して帯電ローラを像担持体に押し当て、帯電ローラと像担持体との間に放電間隙を形成する技術が開示されている。   In Patent Document 2, in order to prevent the occurrence of a bias application failure so that the roller-shaped application member such as a charging roller does not bend, a charging roller (roller-shaped application member) 40 has a circumferential surface near both ends. For example, the protrusion 43 is formed by a heat-shrinkable tube, and the charging roller is placed between the two rolling members 44 with the positions of the respective convex portions sandwiched between them, and is held via the rolling members. The member is in the form of a roller and is rotatably supported by the holder 45 with their axes parallel to each other. The urging member 46 is pressed against the holder so that the urging direction of the urging member is directed to the convex portion. Technology for urging the rolling member with the urging force F of the urging member toward the part and pressing the charging roller against the image carrier through the convex portion to form a discharge gap between the charging roller and the image carrier Is disclosed.

特開２０１０−４９２９０号公報JP 2010-49290 A 特開２００５−０１０５５３号公報JP-A-2005-010553

本発明は、軸に撓みや傾きが生じた場合であっても軸受部材の負担が軽い帯電装置および画像形成装置を提供することを目的とする。   An object of the present invention is to provide a charging device and an image forming apparatus in which a load on a bearing member is light even when the shaft is bent or tilted.

請求項１に係る帯電器は、
被帯電体に沿って延びた回転軸を有し、その被帯電体に接触して回転しながらその被帯電体を帯電させる帯電部材と、
上記帯電部材に沿って延びた回転軸を有し、その帯電部材に接触して回転しながらその帯電部材を清掃する清掃部材と、
上記帯電部材および上記清掃部材の各軸を個別に回転自在に支持する複数の軸受部材と、
上記複数の軸受部材を保持することで上記帯電部材と上記清掃部材との回転軸同士の距離を保つ保持部材と、
上記軸受部材の外周面から上記回転軸を取り巻いて環状に張り出して上記保持部材の内周面と接触した、接触箇所を支点としてその軸受部材が姿勢変化する張出部と、
上記軸受部材の上記張出部と繋がった箇所から突き出して上記保持部材と接触した、その軸受部材をその保持部材に対して回り止めする回止部と、
を備えたことを特徴とする。 The charger according to claim 1 is:
A charging member having a rotating shaft extending along the member to be charged, and charging the member to be charged while rotating in contact with the member to be charged;
A cleaning member having a rotating shaft extending along the charging member and cleaning the charging member while rotating in contact with the charging member;
A plurality of bearing members that individually and rotatably support the shafts of the charging member and the cleaning member;
A holding member that maintains the distance between the rotation shafts of the charging member and the cleaning member by holding the plurality of bearing members;
An overhanging portion that surrounds the rotating shaft from the outer peripheral surface of the bearing member and protrudes in an annular shape and comes into contact with the inner peripheral surface of the holding member;
A rotation stop portion that protrudes from a portion connected to the overhang portion of the bearing member and contacts the holding member, and prevents the bearing member from rotating with respect to the holding member;
It is provided with.

請求項２に係る画像形成装置は、
表面に像が形成されて該像を保持する像保持体と、
上記像保持体の表面を帯電させる帯電器と、
上記帯電器によって帯電された上記像保持体の表面に像を形成する像形成器と、
上記像保持体上の像を記録材上に転写する転写器と、を備え、
上記帯電器が、
上記像保持体に沿って延びた回転軸を有し、その像保持体に接触して回転しながらその像保持体を帯電させる帯電部材と、
上記帯電部材に沿って延びた回転軸を有し、その帯電部材に接触して回転しながらその帯電部材を清掃する清掃部材と、
上記帯電部材および上記清掃部材の各軸を個別に回転自在に支持する複数の軸受部材と、
上記複数の軸受部材を保持することで上記帯電部材と上記清掃部材との回転軸同士の距離を保つ保持部材と、
上記軸受部材の外周面から上記回転軸を取り巻いて環状に張り出して上記保持部材の内周面と接触した、接触箇所を支点としてその軸受部材が姿勢変化する張出部と、
上記軸受部材の上記張出部と繋がった箇所から突き出して上記保持部材と接触した、その軸受部材をその保持部材に対して回り止めする回止部と、
を備えたことを特徴とする。 An image forming apparatus according to claim 2
An image carrier that forms an image on the surface and holds the image;
A charger for charging the surface of the image carrier;
An image forming device that forms an image on the surface of the image carrier charged by the charger;
A transfer device that transfers the image on the image carrier onto a recording material,
The charger is
A charging member having a rotating shaft extending along the image carrier, and charging the image carrier while rotating in contact with the image carrier;
A cleaning member having a rotating shaft extending along the charging member and cleaning the charging member while rotating in contact with the charging member;
A plurality of bearing members that individually and rotatably support the shafts of the charging member and the cleaning member;
A holding member that maintains the distance between the rotation shafts of the charging member and the cleaning member by holding the plurality of bearing members;
An overhanging portion that surrounds the rotating shaft from the outer peripheral surface of the bearing member and protrudes in an annular shape and comes into contact with the inner peripheral surface of the holding member;
A rotation stop portion that protrudes from a portion connected to the overhang portion of the bearing member and contacts the holding member, and prevents the bearing member from rotating with respect to the holding member;
It is provided with.

請求項１に係る帯電器および請求項２に係る画像形成装置によれば、軸に撓みや傾きが生じた場合であっても軸受部材の負担が軽い。   According to the charger according to claim 1 and the image forming apparatus according to claim 2, the burden on the bearing member is light even when the shaft is bent or inclined.

画像形成装置の一実施形態における要部を表した断面構成図である。1 is a cross-sectional configuration diagram illustrating a main part in an embodiment of an image forming apparatus. 帯電器の外観を示す図である。It is a figure which shows the external appearance of a charging device. 軸受機構の内部構造を示す斜視図である。It is a perspective view which shows the internal structure of a bearing mechanism. 軸受機構の内部構造を示す第１の断面図である。It is a 1st sectional view showing the internal structure of a bearing mechanism. 軸受機構の内部構造を示す第２１の断面図である。It is a 21st sectional view showing the internal structure of a bearing mechanism. 軸受部材の構造概念を回転軸が変動していない状態で示す図である。It is a figure which shows the structural concept of a bearing member in the state in which the rotating shaft is not fluctuating. 軸受部材の構造概念を回転軸が変動した状態で示す図である。It is a figure which shows the structural concept of a bearing member in the state from which the rotating shaft fluctuated.

本発明実施形態について、以下図面を参照して説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１は、画像形成装置の一実施形態における要部を表した断面構成図である。   FIG. 1 is a cross-sectional configuration diagram illustrating a main part in an embodiment of an image forming apparatus.

本実施形態の画像形成装置２０は、例えば電子写真方式を採用したモノクロ機であり、具体的には例えばプリンタやファクシミリやコピー機や複合機などといった装置である。   The image forming apparatus 20 of the present embodiment is, for example, a monochrome machine adopting an electrophotographic system, and specifically, is an apparatus such as a printer, a facsimile machine, a copier, or a multifunction machine.

画像形成装置２０には、プロセスカーリッジ２１と転写装置２２と定着装置２３が備えられている。   The image forming apparatus 20 includes a process cartridge 21, a transfer device 22, and a fixing device 23.

プロセスカーリッジ２１は、例えば黒色の画像を形成するものであり、転写装置２２は、このプロセスカートリッジ２１で形成された画像を記録材としての例えば用紙に転写するものである。定着装置２３は、転写装置２２によって用紙上に転写された画像を用紙に定着させるものである。   The process cartridge 21 forms a black image, for example, and the transfer device 22 transfers the image formed by the process cartridge 21 onto, for example, a sheet as a recording material. The fixing device 23 fixes the image transferred onto the paper by the transfer device 22 on the paper.

画像形成装置２０では、図示外の供給装置から用紙が供給され、プロセスカートリッジ２１と転写装置２２との間の転写部位、および定着装置２３を経る搬送経路に沿ってその用紙が搬送され、その後、その用紙は、画像形成装置２０の外部へと送り出される。   In the image forming apparatus 20, paper is supplied from a supply device (not shown), and the paper is conveyed along a transfer path between the process cartridge 21 and the transfer device 22 and the fixing device 23. The sheet is sent out of the image forming apparatus 20.

ここで、プロセスカートリッジ２１の構造について更に説明する。   Here, the structure of the process cartridge 21 will be further described.

本実施形態におけるプロセスカートリッジ２１は、感光体カートリッジ３０ａと現像器３４とが組み合わされた構造を有し、画像形成装置２０の本体筐体（図示省略）に対して着脱自在に装着されている。   The process cartridge 21 in the present embodiment has a structure in which a photosensitive cartridge 30a and a developing device 34 are combined, and is detachably attached to a main body housing (not shown) of the image forming apparatus 20.

感光体カートリッジ３０ａには、感光体３１と帯電器３２とクリーナ３５が共通の筐体に組み込まれていて、一体でプロセスカートリッジ２１に対して着脱自在となっている。帯電器３２は感光体３１に接触して感光体の表面を帯電するものであり、クリーナ３５は感光体３１の表面を清掃するものである。帯電器３２には、感光体３１の表面に接触する帯電ロール４２と、この帯電ロール４２を清掃するための清掃ロール４３が組み込まれている。   The photosensitive member cartridge 30a includes a photosensitive member 31, a charger 32, and a cleaner 35 that are incorporated in a common housing, and is detachably attached to the process cartridge 21 as a unit. The charger 32 contacts the photoconductor 31 to charge the surface of the photoconductor, and the cleaner 35 cleans the surface of the photoconductor 31. The charger 32 incorporates a charging roll 42 that contacts the surface of the photoreceptor 31 and a cleaning roll 43 for cleaning the charging roll 42.

感光体３１が、本発明にいう像保持体の一例に相当するとともに、本発明にいう被帯電体の一例にも相当する。帯電器３２は本発明の帯電器の一実施形態に相当し、帯電ロール４２が、本発明にいう帯電部材の一例に相当し、清掃ロール４３が、本発明にいう清掃部材の一例に相当する。帯電器３２の詳細については後述する。   The photoconductor 31 corresponds to an example of an image carrier according to the present invention and also corresponds to an example of a charged body according to the present invention. The charger 32 corresponds to an embodiment of the charger of the present invention, the charging roll 42 corresponds to an example of a charging member referred to in the present invention, and the cleaning roll 43 corresponds to an example of a cleaning member referred to in the present invention. . Details of the charger 32 will be described later.

現像器３４は、内部に現像剤を収容し、感光体３１上の静電潜像を現像するものである。   The developing device 34 accommodates a developer therein and develops the electrostatic latent image on the photoreceptor 31.

画像形成装置２０の、プロセスカートリッジ２１が装着される箇所には、プロセスカートリッジ２１の帯電器３２と現像器３４との間で感光体３１に対面し、感光体３１上に静電潜像を書き込む露光器として例えばＬＥＤアレイ３３が設けられている。   In the part where the process cartridge 21 is mounted in the image forming apparatus 20, the photosensitive member 31 is faced between the charger 32 and the developing unit 34 of the process cartridge 21, and an electrostatic latent image is written on the photosensitive member 31. For example, an LED array 33 is provided as an exposure device.

転写装置２２は、感光体３１に対向する転写ロール７１を有し、この転写ロール５１に転写バイアスが印加されることで感光体３１と転写ロール７１との間に転写電界を形成し、この転写電界によって感光体３１上の画像を用紙に転移させるものである。   The transfer device 22 has a transfer roll 71 facing the photoconductor 31, and a transfer bias is applied to the transfer roll 51 to form a transfer electric field between the photoconductor 31 and the transfer roll 71. The image on the photosensitive member 31 is transferred to a sheet by an electric field.

定着装置２３は、内部にヒータを有する加熱ロール６１と、この加熱ロール６１に接触して加圧する加圧ロール６２とを有し、これら加熱ロール６１と加圧ロール６２との間の定着域にて用紙上の画像を加熱し加圧して用紙上に定着するものである。   The fixing device 23 includes a heating roll 61 having a heater therein, and a pressure roll 62 that contacts and pressurizes the heating roll 61, and a fixing region between the heating roll 61 and the pressure roll 62 is provided. The image on the paper is heated and pressed to be fixed on the paper.

以下、帯電器３２の構造について更に説明する。   Hereinafter, the structure of the charger 32 will be further described.

図２は、帯電器３２の外観を示す図である。   FIG. 2 is a diagram illustrating an appearance of the charger 32.

帯電器３２は、上述した帯電ロール４２と清掃ロール４３が筐体４１に組み込まれた構造を有する。   The charger 32 has a structure in which the above-described charging roll 42 and cleaning roll 43 are incorporated in the housing 41.

帯電ロール４２は、例えば金属などの導電性材料で形成された回転軸を有し、この回転軸の両端部を除いた個所に帯電層が形成されている。   The charging roll 42 has a rotating shaft made of, for example, a conductive material such as metal, and a charging layer is formed at a portion excluding both ends of the rotating shaft.

清掃ロール４３も、例えば金属などの導電性材料で形成された回転軸を有する。そして、この回転軸の周囲に清掃材として例えばスポンジ材が蝶旋状に巻き付けられてスポンジ層が形成されている。このスポンジ層の素材としては、ポリウレタン、ポリエチレン、ポリアミド又はポリプロピレン等の発泡性の樹脂又はゴムなどから選択されたものが用いられている。   The cleaning roll 43 also has a rotating shaft formed of a conductive material such as metal. Then, for example, a sponge material is wound around the rotating shaft as a cleaning material in a spiral shape to form a sponge layer. As the material for the sponge layer, a material selected from foamable resins such as polyurethane, polyethylene, polyamide, or polypropylene, or rubber is used.

清掃ロール４３は帯電ロール４２に押圧されて荷重が掛かっている。このためスポンジ層が帯電ロール４２の周面に沿って弾性変形して接触域が形成されている。また、帯電ロール４２は感光体３１に押圧されて荷重が掛かっている。   The cleaning roll 43 is pressed by the charging roll 42 and is loaded. For this reason, the sponge layer is elastically deformed along the peripheral surface of the charging roll 42 to form a contact area. The charging roll 42 is pressed against the photoconductor 31 and is loaded.

帯電ロール４２が接触する感光体３１は、図示外のモータによって回転駆動され、本実施形態では帯電ロール４２が感光体３１の回転の力を受けて従動回転する。また、清掃ロール４３も本実施形態では帯電ロール４２の回転の力を受けて従動回転する。なお、本発明にいう帯電部材および清掃部材は自力回転するものであってもよい。   The photosensitive member 31 that contacts the charging roll 42 is driven to rotate by a motor (not shown). In this embodiment, the charging roll 42 is driven to rotate by receiving the rotational force of the photosensitive member 31. Further, in this embodiment, the cleaning roll 43 is driven to rotate by receiving the rotational force of the charging roll 42. Note that the charging member and the cleaning member referred to in the present invention may rotate by themselves.

帯電ロール４２の表面に付着したトナーや外添剤などの不要物は、帯電ロール４２と接触した状態で清掃ロール４３が回転することで清掃ロール４３によって帯電ロール４２の表面から除去される。この除去された不要物は、清掃ロール４３の発泡体のセル内に取り込まれ、セル内で不要物が凝集する。その結果、不要物の凝集体がある適度の大きさになると、清掃ロール４３から帯電ロール４２を介して感光体３１に戻り、感光体３１のクリーナ３５によって回収される。   Unnecessary substances such as toner and external additives attached to the surface of the charging roll 42 are removed from the surface of the charging roll 42 by the cleaning roll 43 when the cleaning roll 43 rotates in contact with the charging roll 42. The removed unnecessary material is taken into the foam cell of the cleaning roll 43, and the unnecessary material aggregates in the cell. As a result, when unnecessary aggregates have a certain size, the cleaning roller 43 returns to the photosensitive member 31 via the charging roller 42 and is collected by the cleaner 35 of the photosensitive member 31.

筐体４１は、帯電ロール４２および清掃ロール４３の両端を回転自在に保持するための軸受機構１００，２００を備えている。両端の軸受機構１００，２００のうち、一方の軸受機構１００には、帯電ロール４２に電圧を供給する給電機構が組み込まれているが給電機構の詳細については説明を省略する。   The housing 41 includes bearing mechanisms 100 and 200 for rotatably holding both ends of the charging roll 42 and the cleaning roll 43. Of the bearing mechanisms 100 and 200 at both ends, one of the bearing mechanisms 100 incorporates a power feeding mechanism that supplies a voltage to the charging roll 42, but the details of the power feeding mechanism will be omitted.

軸受機構１００，２００の内部構造について、以下説明するが、両端の軸受機構１００，２００に共通する構造のみを説明する。   The internal structure of the bearing mechanisms 100 and 200 will be described below, but only the structure common to the bearing mechanisms 100 and 200 at both ends will be described.

図３〜図５は、軸受機構１００，２００の内部構造を示す図である。図３には斜視図が示され、図４および図５には切断位置が異なる断面図が示されている。   3-5 is a figure which shows the internal structure of the bearing mechanisms 100 and 200. FIG. 3 is a perspective view, and FIGS. 4 and 5 are cross-sectional views at different cutting positions.

図３には、帯電ロール４２および清掃ロール４３の回転軸４２ａ，４３ａが、軸受機構１００，２００によって保持された端部を残して切断された状態が示されている。   FIG. 3 shows a state in which the rotating shafts 42 a and 43 a of the charging roll 42 and the cleaning roll 43 are cut leaving the ends held by the bearing mechanisms 100 and 200.

軸受機構１００，２００には位置決めホルダ１１０が組み込まれており、この位置決めホルダ１１０は、２つの軸受部材１２０、１３０を保持している。位置決めホルダ１１０は本発明にいう保持部材の一例に相当し、軸受部材１２０（１３０）は本発明にいう軸受部材の各一例に相当する。   A positioning holder 110 is incorporated in the bearing mechanisms 100 and 200, and the positioning holder 110 holds two bearing members 120 and 130. The positioning holder 110 corresponds to an example of a holding member according to the present invention, and the bearing member 120 (130) corresponds to each example of a bearing member according to the present invention.

位置決めホルダ１１０は、例えば一般的な樹脂（例えばＰＯＭ等）製で、この位置決めホルダ１１０には各軸受部材１２０、１３０が個々に嵌め込まれる凹部１１２、１１３が形成されている。   The positioning holder 110 is made of, for example, a general resin (for example, POM). The positioning holder 110 is formed with recesses 112 and 113 into which the bearing members 120 and 130 are individually fitted.

帯電ロール４２の回転軸４２ａは、第１の軸受部材１２０によって回転自在に保持されており、清掃ロール４３の回転軸４３ａは、第２の軸受部材１３０によって回転自在に保持されている。各軸受部材１２０、１３０は、摺動性および耐摩耗性の高い樹脂材料、例えば非導電性のＰＯＭにて形成されていて、各回転軸４２ａ，４３ａが嵌まり込む断面円形状の凹部１２１、１３１を有している。   The rotating shaft 42 a of the charging roll 42 is rotatably held by the first bearing member 120, and the rotating shaft 43 a of the cleaning roll 43 is rotatably held by the second bearing member 130. Each of the bearing members 120 and 130 is formed of a resin material having high slidability and wear resistance, for example, non-conductive POM, and has a circular cross-sectional concave portion 121 into which each of the rotation shafts 42a and 43a is fitted. 131.

位置決めホルダ１１０は、各軸受部材１２０、１３０を保持することによって帯電ロール４２および清掃ロール４３の回転軸４２ａ，４３ａの距離を保っている。また、各軸受部材１２０、１３０は、位置決めホルダ１１０の各凹部１１２、１１３に嵌め込まれているが、軸受部材１２０（１３０）が凹部１１２（１１３）の内壁と接している箇所は、環状の鍔１２４（１３４）になっている。この鍔１２４（１３４）は、軸受部材１２０（１３０）の周壁の回りに環状に形成されていて、周壁の一部から外側に張り出した本発明にいう張出部の一例となっている。なお、鍔１２４（１３４）の断面形状は、稜が平らな台形状や矩形状であってもよく、稜が尖った半円形状や三角形状であってもよい。   The positioning holder 110 maintains the distance between the rotation shafts 42 a and 43 a of the charging roll 42 and the cleaning roll 43 by holding the bearing members 120 and 130. The bearing members 120 and 130 are fitted in the recesses 112 and 113 of the positioning holder 110. The portion where the bearing member 120 (130) is in contact with the inner wall of the recess 112 (113) is an annular flange. 124 (134). The flange 124 (134) is formed in an annular shape around the peripheral wall of the bearing member 120 (130), and is an example of an overhanging portion according to the present invention that protrudes outward from a part of the peripheral wall. The cross-sectional shape of the ridge 124 (134) may be a trapezoidal shape or a rectangular shape with a flat ridge, or may be a semicircular shape or a triangular shape with a sharp ridge.

この鍔１２４（１３４）は、鍔１２４（１３４）の稜と凹部１１２（１１３）の内壁が線状（あるいは細い帯状）に接触するので、回転軸４２ａ，４３ａの角度が変動した場合であっても、接触箇所を支点として軸受部材１２０（１３０）が回転軸４２ａ，４３ａの角度変動に追随して向きを変える。この結果、軸受部材１２０（１３０）は回転軸４２ａ，４３ａに対して正対した姿勢を維持するので、片減りなどが抑制されることになる。   This ridge 124 (134) is a case where the angle of the rotating shafts 42a and 43a fluctuates because the ridge of the ridge 124 (134) and the inner wall of the recess 112 (113) are in linear contact (or a thin strip shape). However, the bearing member 120 (130) changes its direction following the angle fluctuation of the rotating shafts 42a and 43a with the contact point as a fulcrum. As a result, the bearing member 120 (130) maintains a posture facing the rotating shafts 42a and 43a, so that one-side reduction or the like is suppressed.

また、軸受部材１２０（１３０）には、本発明にいう回止部の一例として回転止め部１２５（１３５）が形成されている。この回転止め部１２５（１３５）は、軸受部材１２０（１３０）の周壁から外側に突き出し、位置決めホルダ１１０に例えば掛かるように接触することで位置決めホルダ１１０に対する軸受部材１２０（１３０）の回転を止めている。本実施形態では、回転止め部１２５（１３５）は鍔１２４（１３４）に隣接した位置に設けられている。   Further, the bearing member 120 (130) is formed with a rotation stop portion 125 (135) as an example of the rotation stop portion referred to in the present invention. The rotation stopper 125 (135) protrudes outward from the peripheral wall of the bearing member 120 (130), and stops the rotation of the bearing member 120 (130) relative to the positioning holder 110 by contacting the positioning holder 110, for example. Yes. In the present embodiment, the rotation stopper 125 (135) is provided at a position adjacent to the collar 124 (134).

ここで、回転止め部１２５（１３５）と鍔１２４（１３４）との位置関係について考察する。   Here, the positional relationship between the rotation stopper 125 (135) and the flange 124 (134) will be considered.

図６，図７は、軸受部材１２０（１３０）の構造概念を示す図である。図６には回転軸４２ａ，４３ａが変動していない状態が示され、図７には回転軸４２ａ，４３ａが変動した状態が示されている。また、図６（Ａ）、図７（Ａ）には側面図が示され、図６（Ｂ）、図７（Ｂ）には正面図が示されている。   6 and 7 are views showing the structural concept of the bearing member 120 (130). FIG. 6 shows a state where the rotating shafts 42a and 43a are not changing, and FIG. 7 shows a state where the rotating shafts 42a and 43a are changed. 6A and 7A are side views, and FIG. 6B and FIG. 7B are front views.

軸受部材１２０（１３０）には、周壁の回りに環状の鍔１２４（１３４）が設けられており、回転止め部１２５（１３５）は鍔１２４（１３４）に隣接した位置に設けられている。ここで、比較のために、鍔１２４（１３４）から離れた位置に回転止め部１２５（１３５）が設けられた場合の状態が点線で示されている。   The bearing member 120 (130) is provided with an annular flange 124 (134) around the peripheral wall, and the rotation stopper 125 (135) is provided at a position adjacent to the flange 124 (134). Here, for comparison, a state in which the rotation stopper 125 (135) is provided at a position away from the collar 124 (134) is indicated by a dotted line.

ここで、図６に示す状態から図７に示す状態へと回転軸４２ａ，４３ａが変動した場合を検討すると、軸受部材１２０（１３０）は鍔１２４（１３４）の稜を支点として向きが変わる。そして、軸受部材１２０（１３０）の向きが変わるのに伴って、回転止め部１２５（１３５）の位置が移動する。そして、回転軸４２ａ，４３ａの変動の前後における回転止め部１２５（１３５）の移動量を見ると、鍔１２４（１３４）と接触している場合の移動量ｄ１よりも、鍔１２４（１３４）から離れている場合の移動量ｄ２の方が大きいことが分かる。このような回転止め部１２５（１３５）の移動は、回転軸４２ａ，４３ａの変動に追随して軸受部材１２０（１３０）の向きが変わり得る範囲を制限することになる。つまり、回転止め部１２５（１３５）が鍔１２４（１３４）と接触している場合には軸受部材１２０（１３０）の向きの変更範囲はあまり制限されないが、回転止め部１２５（１３５）が鍔１２４（１３４）から離れていると軸受部材１２０（１３０）の向きの変更範囲が制限されることになる。   Here, considering the case where the rotating shafts 42a and 43a fluctuate from the state shown in FIG. 6 to the state shown in FIG. 7, the bearing member 120 (130) changes its direction with the ridge of the flange 124 (134) as a fulcrum. Then, as the direction of the bearing member 120 (130) changes, the position of the rotation stopper 125 (135) moves. When the movement amount of the rotation stopper 125 (135) before and after the fluctuation of the rotation shafts 42a and 43a is viewed, the movement amount d1 when the rotation stoppers 125 (135) are in contact with the collar 124 (134) is larger than that of the collar 124 (134). It can be seen that the amount of movement d2 in the case of being away is larger. Such movement of the rotation stopper 125 (135) restricts the range in which the orientation of the bearing member 120 (130) can change following the fluctuation of the rotation shafts 42a and 43a. That is, when the rotation stopper 125 (135) is in contact with the flange 124 (134), the range of change in the direction of the bearing member 120 (130) is not so limited, but the rotation stopper 125 (135) is not limited to the flange 124. If it is away from (134), the change range of the direction of the bearing member 120 (130) is limited.

従って、回転止め部１２５（１３５）は鍔１２４（１３４）と接触して設けられると、回転軸４２ａ，４３ａに大きな変動が生じても軸受部材１２０（１３０）の負担は軽く、片減りなどが回避されることが分かる。   Therefore, when the rotation stopper 125 (135) is provided in contact with the flange 124 (134), the bearing member 120 (130) is lightly loaded even if a large variation occurs in the rotation shafts 42a and 43a, and the rotation is reduced. It can be seen that it is avoided.

なお、回転止め部１２５（１３５）は、鍔１２４（１３４）と接触して設けられているならば、必ずしも一体で形成される必要はないし、逆に、回転止め部１２５（１３５）が鍔１２４（１３４）に一部食い込むように設けられたり、回転止め部１２５（１３５）が鍔１２４（１３４）の円環の一部から突き出すように設けられていてもよい。   Note that the rotation stopper 125 (135) does not necessarily need to be integrally formed as long as the rotation stopper 125 (135) is provided in contact with the flange 124 (134). (134) may be provided so as to partially bite, or the rotation stopper 125 (135) may be provided so as to protrude from a part of the ring of the flange 124 (134).

図４〜図６に示すように本実施形態で回転止め部１２５（１３５）が鍔１２４（１３４）に隣接した位置に設けられているのは、鍔１２４（１３４）の外形が単純な円環である方が、円環に凹凸がついた外形である場合よりも成型時に高い精度が得られるからである。   As shown in FIGS. 4 to 6, in the present embodiment, the rotation stopper 125 (135) is provided at a position adjacent to the flange 124 (134) because the outer shape of the flange 124 (134) is simple. This is because higher accuracy can be obtained at the time of molding than in the case of an outer shape having an uneven ring.

２０……画像形成装置、 ２１……プロセスカーリッジ、 ３１……感光体、 ３２……帯電器、 ３３……ＬＥＤアレイ、 ３４……現像器、 ４２……帯電ロール、 ４３……清掃ロール、 ４２ａ，４３ａ……回転軸、 １００，２００……軸受機構、 １１０……位置決めホルダ、 １２０，１３０……軸受部材、 １２４，１３４……鍔、 １２５，１３５……回転止め部、   20... Image forming apparatus 21... Process cartridge 31... Photoconductor 32. Charger 33. LED array 34 .Developer 42. Charging roll 43 43 Cleaning roll 42a, 43a ... rotating shaft, 100, 200 ... bearing mechanism, 110 ... positioning holder, 120, 130 ... bearing member, 124, 134 ... 鍔, 125, 135 ... anti-rotation part,

Claims (2)

被帯電体に沿って延びた回転軸を有し、該被帯電体に接触して回転しながら該被帯電体を帯電させる帯電部材と、
前記帯電部材に沿って延びた回転軸を有し、該帯電部材に接触して回転しながら該帯電部材を清掃する清掃部材と、
前記帯電部材および前記清掃部材の各軸を個別に回転自在に支持する複数の軸受部材と、
前記複数の軸受部材を保持することで前記帯電部材と前記清掃部材との回転軸同士の距離を保つ保持部材と、
前記軸受部材の外周面から前記回転軸を取り巻いて環状に張り出して前記保持部材の内周面と接触した、接触箇所を支点として該軸受部材が姿勢変化する張出部と、
前記軸受部材の前記張出部と繋がった箇所から突き出して前記保持部材と接触した、該軸受部材を該保持部材に対して回り止めする回止部と、
を備えたことを特徴とする帯電器。 A charging member having a rotating shaft extending along the member to be charged, and charging the member to be charged while rotating in contact with the member to be charged;
A cleaning member having a rotating shaft extending along the charging member, and cleaning the charging member while rotating in contact with the charging member;
A plurality of bearing members that individually and rotatably support the shafts of the charging member and the cleaning member;
A holding member that maintains the distance between the rotating shafts of the charging member and the cleaning member by holding the plurality of bearing members;
An overhanging portion that changes the posture of the bearing member around the contact point, which is in contact with the inner circumferential surface of the holding member, surrounding the rotating shaft from the outer circumferential surface of the bearing member;
A rotation stop portion that protrudes from a portion connected to the overhang portion of the bearing member and contacts the holding member, and prevents the bearing member from rotating with respect to the holding member;
A charging device comprising: 表面に像が形成されて該像を保持する像保持体と、
前記像保持体の表面を帯電させる帯電器と、
前記帯電器によって帯電された前記像保持体の表面に像を形成する像形成器と、
前記像保持体上の像を記録材上に転写する転写器と、を備え、
前記帯電器が、
前記像保持体に沿って延びた回転軸を有し、該像保持体に接触して回転しながら該像保持体を帯電させる帯電部材と、
前記帯電部材に沿って延びた回転軸を有し、該帯電部材に接触して回転しながら該帯電部材を清掃する清掃部材と、
前記帯電部材および前記清掃部材の各軸を個別に回転自在に支持する複数の軸受部材と、
前記複数の軸受部材を保持することで前記帯電部材と前記清掃部材との回転軸同士の距離を保つ保持部材と、
前記軸受部材の外周面から前記回転軸を取り巻いて環状に張り出して前記保持部材の内周面と接触した、接触箇所を支点として該軸受部材が姿勢変化する張出部と、
前記軸受部材の前記張出部と繋がった箇所から突き出して前記保持部材と接触した、該軸受部材を該保持部材に対して回り止めする回止部と、
を備えたことを特徴とする画像形成装置。 An image carrier that forms an image on the surface and holds the image;
A charger for charging the surface of the image carrier;
An image forming device that forms an image on the surface of the image carrier charged by the charger;
A transfer device for transferring an image on the image carrier onto a recording material,
The charger is
A charging member having a rotating shaft extending along the image carrier, and charging the image carrier while rotating in contact with the image carrier;
A cleaning member having a rotating shaft extending along the charging member, and cleaning the charging member while rotating in contact with the charging member;
A plurality of bearing members that individually and rotatably support the shafts of the charging member and the cleaning member;
A holding member that maintains the distance between the rotating shafts of the charging member and the cleaning member by holding the plurality of bearing members;
An overhanging portion that changes the posture of the bearing member around the contact point, which is in contact with the inner circumferential surface of the holding member, surrounding the rotating shaft from the outer circumferential surface of the bearing member;
A rotation stop portion that protrudes from a portion connected to the overhang portion of the bearing member and contacts the holding member, and prevents the bearing member from rotating with respect to the holding member;
An image forming apparatus comprising:
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