JP2004117806A - Electrophotographic image forming apparatus and electric contact member - Google Patents

Electrophotographic image forming apparatus and electric contact member Download PDF

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Publication number
JP2004117806A
JP2004117806A JP2002280764A JP2002280764A JP2004117806A JP 2004117806 A JP2004117806 A JP 2004117806A JP 2002280764 A JP2002280764 A JP 2002280764A JP 2002280764 A JP2002280764 A JP 2002280764A JP 2004117806 A JP2004117806 A JP 2004117806A
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JP
Japan
Prior art keywords
developing device
developing
rotary
contact
electric contact
Prior art date
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Pending
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JP2002280764A
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Japanese (ja)
Inventor
Takashi Sho
邵 俊
Takehiko Suzuki
鈴木 健彦
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Canon Inc
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Canon Inc
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Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP2002280764A priority Critical patent/JP2004117806A/en
Publication of JP2004117806A publication Critical patent/JP2004117806A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a color image forming apparatus which is provided with electrical contact members having superior durability and stability to realize high developability. <P>SOLUTION: Contact members such as a developing contact fixed to a rotary side surface, a blade contact, a discharging contact or the like are formed from a single metallic wire and the electrical contact members are provided with two tilts with respect to forward and backward rotational directions of a rotary and at least two place winding sections corresponding to the pushing operations of the tilt. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は電子写真画像形成装置に係わり、特に複数の現像器を保持して順次現像動作を行うロータリー式カラー電子写真画像形成装置のロータリー上に配置する電気接点に関するものである。
【0002】
【従来の技術】
従来技術として、特開平11−52716及び図4に示す構成がある。
【0003】
現像部4では、各色(イエローY、マゼンタM、シアンC、ブラックBk)の現像剤(トナー)を収容する現像器(4Y、4M、4C、4Bk)を保持するロータリー10の回転により、選択的に、各色の現像器を像担持体の感光体1の対峙位置に設定され、感光体1上に露光手段3により形成された静電的な潜像を現像し、各色のトナー像が形成される。感光体1上のトナー像は中間転写手段5a上で重ね合わされて、給紙部19から搬送されてきた転写材に転写される。その後、転写材は搬送手段12により定着部8へと搬送される。
【0004】
感光体1上に形成された潜像を現像剤により可視画像とする現像器としては、図5に示す模式図に示すように、現像剤を表面に担持しながら回転する現像剤担持体100に電力供給源101から接触子102を介して高電圧が印加され、感光体表面(図示せず)と現像剤担持体100の表面の電界作用により、現像剤担持体表面に担持されている現像剤を感光体上に形成されている潜像に転移させ、その潜像の可視画像化を行う現像器103が一般的である。
【0005】
このような現像器103において、現像処理中は、接触子102,102が互いに接触し、電力供給源101から現像剤担持体100に電圧が印加されることにより、感光体上の潜像が可視画像とされ、また現像処理終了後は接触子102,102が互いに離間して電力供給源101からの電圧の印加が中断されていた。
【0006】
しかしながら、現在カラーLBP(レーザービームプリンタ)において、高精細、高解像度の技術革新のため、現像に用いる現像剤の小径化、球形化の進行に伴い、小粒径現像剤等の十分な帯電が困難となる傾向が現れ、現像剤担持体100の軸方向における現像剤担持体100の両端部表面及び、現像器130の本体の間に形成された空間から帯電不十分な小粒径現像剤が漏れる、もしくは吹き出しが生じる恐れがあったことから、その現像剤漏れの抑制が望まれていた。
【0007】
そのため、例えば現像器内にも現像剤の現像器端部からの吹き出しや、現像剤のすり抜けによる現像剤の落下(もれ)対策のため、以下で説明する図6に示すような対策が提案され実施されている。トナー漏れ抑制ブレード220が現像スリーブローラ100の長手方向に沿って平行に近接した状態で配置されている。そして、AC高圧印加時に、トナー漏れ抑制ブレード220に対して、現像器スリーブローラ100に印加する高圧と同極性のバイアスを印加することにより、画像形成中に現像器スリーブローラ100とトナー漏れ抑制ブレード220の接触している部分にトナーが付着することなく、前述のトナー諸問題を解消する方法が図られた。
【0008】
また、図6に示すように、トナー漏れ抑制ブレード220に対しても高圧を印加して画像形成を行う現像器についても、さらに図5のように高圧を印加する漏れ抑制部材がない現像器においても、現像中に帯電されているトナーにより次の現像器を選択するために現像器接点を離間した場合、通常ではその帯電しているトナーは十分減衰することなく、現像器内に残留する。そのため、現像スリーブローラ100に残留トナーの帯電している電荷量に応じた電位が発生してしまい、その後に現像器が再び現像位置に移動し、両接触子102、102が接触する際には、位置Zと位置Yとの間にも電位差が生じるため、安全面における改善が求められていた。
【0009】
この問題については改善した構成が提案されているが(例えば、特許文献1参照)、この提案のものは各現像器内に除電体を有しているのでコストが高くなっている。
【特許文献1】
特開平11−295985号公報
【0010】
【発明が解決しようとする課題】
そこで、本発明は、現像器から現像剤の吹き出し及び、現像剤漏れ抑制体への現像剤の吸着を抑制すると共に、現像処理後における現像剤担持体、もしくは現像剤漏れ抑制体の残留電荷を十分に除電可能な、耐久性のある、安定する現像器給電および除電装置を備える画像形成装置および現像装置、並びに現像方法を提供することを目的とする。
【0011】
【課題を解決するための手段】
上記課題を解決するために、本発明の画像形成装置は、複数の現像器を保持して回転させるロータリー機構を備え、該ロータリーの回転により所定の現像器を順次像担持体との対峙位置に移動し、選択的に前記現像器を前記像担持体に当接離間させて、前記像担持体に形成された静電潜像を現像する電子写真画像形成装置であって、前記像担持体に形成された静電潜像を現像する際に、前記現像器に各種バイアス電圧を印加する接離可能な電気接点部材がロータリーの側面に対向して配置され、一本の金属線から形成されていて、前記ロータリーの正逆の各回転方向に対して、二つの傾斜と、前記ロータリーが回転する際に、前記現像器と前記傾斜との衝突による押し込み動作に対応した少なくとも2ヶ所の巻き部を設けたことを特徴とする。
【0012】
さらに、各前記現像器が前記像担持体との対峙位置に移動した時に、前記現像器にバイアス電圧を印加できるように前記現像器の電気接点部にロータリーに固定された前記電気接点部材が接触し、前記現像器の現像後に、前記ロータリーの回転により、前記現像器が前記像担持体との対峙位置以外の位置に移動し、前記電気接点部材は現像器の電気接点部と離れることを特徴とする。
【0013】
また、上記課題の内、現像器内の残留電荷を除去するために、選択された現像器による現像動作終了後に、前記現像器内の残留電荷を除電するための電気接点部材がロータリーに固定されて、前記現像器の次回の現像処理開始までに残留電荷を除去する前記電気接点部材は一本の金属線から形成されていて、前記ロータリーの正逆の各回転方向に対して、二つの傾斜と、前記ロータリーが回転する際に、前記現像器と前記傾斜との衝突による押し込み動作に対応した少なくとも2ヶ所の巻き部を設けたことを特徴とする。
【0014】
さらに、前記現像器内の残留電荷を除去するための前記電気接点は接離可能であり、残留電荷を保持する前記現像器上の各電器接点と接触して除電している時に、複数ある他の前記現像器の一つが前記像担持体と対峙する位置にあり、現像可能であることを特徴とする。
【0015】
【発明の実施の形態】
(第1の実施例)
まず、図1に本発明を適用したロータリーカラー画像形成装置のロータリー構成の一部を示す。各色の現像器(Y、M、C、Bk)は同形状で、ロータリーにおける動作は同様であるために、ここでは、イエロートナーの現像器の動作を例に本発明に関わるカラー画像形成装置におけるロータリーの動作について説明する。
【0016】
図示しない露光手段によってイエロー画像の光照射により、図示しない感光ドラム上にイエローの潜像は形成される。イエロー現像器302の回転により感光ドラムとの対峙位置(現像位置)に配置される。現像位置への進入時に、図示しない現像ローラーへ繋がる現像器現像接点303がロータリー側面に配置された現像接点306と衝突し、現像接点306をロータリー側面側へ押し込み、確実に現像器現像接点303と現像接点306を接触させる。同時に、図示しないトナー漏れ抑制ブレードに繋がる現像器ブレード接点304がロータリー側面に配置されたブレード接点305と衝突し、ブレード接点305をロータリー側面側へ押し込み、確実に現像器ブレード接点304とブレード接点305を接触させる。
【0017】
ここで、イエロー現像器の回転慣性力により、現像位置を少し通りすぎることがある。そこで、図示しない位置補正機構により、イエロー現像器を少し逆転させて、正しい現像位置に戻す。その時に、現像器現像接点303が現像接点306を正転時と逆方向に押し込み、確実に接触する。同様に、現像器ブレード接点304がブレード接点305を正転時と逆方向に押し込み、確実に接触する。イエロー現像器が現像位置に完全に止まった後に、図示しない電力供給源から現像接点306とブレード接点305を通じて、現像器スリーブとブレードにそれぞれバイアス電圧を印加して、図示しない加圧機構により、現像スリーブを感光ドラムへ当接させて、感光ドラム上のイエローの潜像を現像する。現像終了後に、イエロー現像器が感光ドラムから離間して回転し、現像位置から離れ、次の現像に備える。同時に、現像器現像接点303と現像接点306が離れ、現像器ブレード接点304とブレード接点305が離れる。
【0018】
本実施例では、本発明を適用した現像接点とブレード接点の形状が同じで一本の金属線から形成されている。ここで、現像接点だけを説明する。図2は図1に示した現像接点306を回転中心から見た図を示して、イエロー現像器302が進入して、現像位置に止まるまでの特徴を説明する。感光体上に形成されたイエローの潜像を現像する時に、現像器が図示方向(正転方向)に進入してき、約45度の傾斜部402に衝突し、現像ばねをロータリー側面側へ押し込む。この時に、巻き部401が主に変形し、衝撃力を緩和し、接点折れを防止する。現像器が逆転(図示方向と逆)して現像位置に停止する場合は、現像器は傾斜部404と接触し、現像接点をロータリー側面側へ押し込む。ここで、巻き部405が主に変形し、応力分散により、接点折れを防止する。
【0019】
(第2の実施例)
本発明の第2の実施形態は、第1の実施形態のカラー画像形成装置において、現像器の現像プロセス終了後に現像器に残留する静電電荷を除電する除電接点部材に関するものである。図1にその配置を示す。現像器回転中心に対して、現像接点306およびブレード接点305から180度回転した位置に除電接点307aと307bが配置される。この配置関係から、例えば、イエロー、シアン、マゼンタ、ブラックの順に現像する場合は、イエロー現像器が現像終了後、帯電したまま回転し、マゼンタが現像中に、イエローの現像器現像接点303と現像器ブレード接点304がそれぞれ除電接点部材307aと307bと接触し、完全に除電される。ここで、除電位置と現像位置は180度の関係で、現像と除電を同時に行える。なお、180度以外に、90度と270度にしても同様な効果が得られる。
【0020】
図3に除電接点の詳細を示す。除電部材307aと307bが同形状であるため、除電部材307aだけを示す。図3は図1に示した除電接点307aを回転中心から見た図を示して、イエロー現像器302が進入して、除電位置に止まるまでの特徴を説明する。除電部材307aは巻き部501の中心が固定されて、回転のみが可能である。現像器が図示方向(正転方向)に進入し、傾斜部502と衝突し、除電部材をロータリー側面側に押し込む。主に巻き部506が変形し、衝撃力を緩和する。現像器が逆転して除電位置に停止する場合は、現像器は傾斜部404と接触し、現像接点をロータリー側面側へ押し込む。ここで、巻き部507が主に変形し、応力分散により、接点折れを防止する。
【0021】
【発明の効果】
以上説明したように、本発明の第1の形態によれば、現像器を切り替えても、現像器の現像スリーブローラとブレードへのバイアスを確実にかけられ、衝撃を受ける接点側も損傷や折れなどの問題が発生しない、耐久性と安定性に優れた電気接点により、
安定した現像動作が得られ、現像剤の漏れを抑制することができる。
【0022】
また、本発明の第2の形態によれば、現像終了後に、現像器が回転しても、現像器が持つ残留電荷を次回現像処理再開までに除電接点により除電されるので、現像処理再開に伴う接触による火花放電を確実に防止することができる。
【図面の簡単な説明】
【図1】本発明を適用した画像形成装置の電気接点部
【図2】本発明を適用した現像接点とブレード接点
【図3】本発明を適用した除電接点
【図4】電子写真方式の画像形成装置の概要
【図5】従来の現像器の一例の概略構成を示す模式図
【図6】従来の現像器の他の例の概略構成を示す模式図
【符号の説明】
1 感光ドラム
3 露光手段
4 現像部
4Y、4M、4C、4Bk 各色の現像器
5 I/Oカートリッジ
8 定着器
301 ロータリーの側面
302 イエローの現像器
303 現像器の現像接点
304 現像器のブレード接点
305 現像接点
306 ブレード接点
307a、307b 除電接点
401、403、405 現像接点の傾斜部
402、404 現像接点の巻き部
502、504 除電接点の傾斜部
501、503、505、506、507 除電接点の巻き部
100 現像スリーブローラ(現像剤担持体)
101 電圧印加体(電力供給源)
102 接触子(高圧接点、接点)
103 色現像器
108 現像器選択機構部
200 現像剤漏れ抑制体(諸現像剤対策ブレード)
201 コンデンサ
202 AC高圧印加にダイオード
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electrophotographic image forming apparatus, and more particularly to an electric contact disposed on a rotary of a rotary type color electrophotographic image forming apparatus that holds a plurality of developing units and sequentially performs a developing operation.
[0002]
[Prior art]
As a prior art, there is a configuration shown in JP-A-11-52716 and FIG.
[0003]
The developing unit 4 selectively rotates the rotary 10 that holds developing units (4Y, 4M, 4C, and 4Bk) that store developers (toners) of the respective colors (yellow Y, magenta M, cyan C, and black Bk). Then, the developing units of the respective colors are set at positions facing the photosensitive member 1 of the image carrier, and the electrostatic latent images formed on the photosensitive member 1 by the exposure means 3 are developed to form toner images of the respective colors. You. The toner images on the photoreceptor 1 are superimposed on the intermediate transfer means 5 a and are transferred onto a transfer material conveyed from the paper supply unit 19. After that, the transfer material is transported to the fixing unit 8 by the transport unit 12.
[0004]
As shown in the schematic diagram of FIG. 5, a developing device that turns a latent image formed on the photoreceptor 1 into a visible image by using a developer includes a developer carrier 100 that rotates while carrying the developer on the surface. A high voltage is applied from a power supply source 101 via a contact 102, and the developer carried on the surface of the developer carrier by the electric field effect between the surface of the photoconductor (not shown) and the surface of the developer carrier 100. Is generally transferred to a latent image formed on the photoreceptor, and a developing device 103 that visualizes the latent image is used.
[0005]
In such a developing device 103, during the developing process, the contacts 102, 102 come into contact with each other, and a voltage is applied from the power supply source 101 to the developer carrier 100, so that the latent image on the photoconductor is visible. After completion of the developing process, the contacts 102 were separated from each other, and the application of the voltage from the power supply source 101 was interrupted.
[0006]
However, at present, in a color LBP (laser beam printer), due to the technical innovation of high definition and high resolution, sufficient charging of a small particle size developer or the like is required as the developer used for development becomes smaller and more spherical. This tends to be difficult, and the insufficiently charged small-particle-size developer is discharged from both end surfaces of the developer carrier 100 in the axial direction of the developer carrier 100 and a space formed between the main body of the developing device 130. Since there is a risk of leakage or blowing, it has been desired to suppress the developer leakage.
[0007]
Therefore, for example, in order to prevent the developer from being blown out from the end of the developing device into the developing device or from falling (leaking) of the developer due to the slipping of the developer, the following measures as shown in FIG. 6 are proposed. Has been implemented. The toner leakage suppression blade 220 is arranged in a state of being parallel and close to the developing sleeve roller 100 along the longitudinal direction. When an AC high voltage is applied, a bias having the same polarity as the high voltage applied to the developing device sleeve roller 100 is applied to the toner leakage suppressing blade 220 during the image formation. A method for solving the above-mentioned various problems of the toner without adhering the toner to the contacting portion 220 has been achieved.
[0008]
Further, as shown in FIG. 6, a developing device which applies a high voltage also to the toner leakage suppressing blade 220 to form an image, and a developing device having no leakage suppressing member for applying a high pressure as shown in FIG. However, when the developing device contacts are separated to select the next developing device with the toner charged during development, the charged toner usually remains in the developing device without being sufficiently attenuated. As a result, a potential corresponding to the amount of charge of the residual toner is generated on the developing sleeve roller 100, and then the developing device moves to the developing position again, and when the two contacts 102 and 102 come into contact with each other. Since a potential difference also occurs between the position Z and the position Y, an improvement in safety has been required.
[0009]
Although an improved configuration has been proposed to solve this problem (see, for example, Patent Document 1), the cost of this proposal is high because each developing unit has a static eliminator.
[Patent Document 1]
Japanese Patent Application Laid-Open No. H11-295985
[Problems to be solved by the invention]
Therefore, the present invention suppresses the blowing of the developer from the developing device and the adsorption of the developer to the developer leakage suppressor, and also reduces the residual charge of the developer carrier or the developer leakage suppressor after the development processing. An object of the present invention is to provide an image forming apparatus, a developing apparatus, and a developing method including a stable and stable developing unit power supply and static eliminator capable of sufficiently eliminating static electricity.
[0011]
[Means for Solving the Problems]
In order to solve the above problems, the image forming apparatus of the present invention includes a rotary mechanism that holds and rotates a plurality of developing devices, and a predetermined developing device is sequentially moved to a position facing the image carrier by rotation of the rotary. An electrophotographic image forming apparatus that moves and selectively contacts and separates the developing device from the image carrier to develop an electrostatic latent image formed on the image carrier; When the formed electrostatic latent image is developed, a contactable / separable electrical contact member for applying various bias voltages to the developing device is disposed to face the side surface of the rotary, and is formed of one metal wire. For each of the forward and reverse rotation directions of the rotary, two inclinations, and at least two winding portions corresponding to a pushing operation due to a collision between the developing device and the inclination when the rotary rotates. It is characterized by having been provided
[0012]
Further, when each of the developing devices is moved to a position facing the image carrier, the electric contact member fixed to the electric contact portion of the developing device is in contact with the electric contact portion of the developing device so that a bias voltage can be applied to the developing device. Then, after the development of the developing device, the rotation of the rotary moves the developing device to a position other than the position facing the image carrier, and the electric contact member is separated from the electric contact portion of the developing device. And
[0013]
Further, among the above problems, in order to remove the residual charge in the developing device, an electric contact member for removing the residual charge in the developing device is fixed to the rotary after the development operation by the selected developing device is completed. The electric contact member for removing the residual electric charge before the next development process of the developing device is formed of one metal wire, and has two inclinations with respect to the forward and reverse rotation directions of the rotary. And at least two winding portions corresponding to a pushing operation due to a collision between the developing device and the inclination when the rotary rotates.
[0014]
Further, the electric contact for removing the residual electric charge in the developing device is detachable, and a plurality of electric contacts are removed when the electric contact is made in contact with each electric contact on the developing device holding the residual electric charge. One of the developing devices is located at a position facing the image carrier, and is capable of developing.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
(First embodiment)
First, FIG. 1 shows a part of a rotary configuration of a rotary color image forming apparatus to which the present invention is applied. Since the developing units (Y, M, C, and Bk) of the respective colors have the same shape and the operation in the rotary is the same, the operation of the developing unit for the yellow toner is described here as an example in the color image forming apparatus according to the present invention. The operation of the rotary will be described.
[0016]
A yellow latent image is formed on a photosensitive drum (not shown) by irradiating a yellow image with light by exposure means (not shown). It is arranged at a position (developing position) facing the photosensitive drum by the rotation of the yellow developing device 302. When the developing device enters the developing position, the developing device developing contact 303 connected to the developing roller (not shown) collides with the developing contact 306 arranged on the rotary side surface, and pushes the developing contact 306 toward the rotary side surface, thereby ensuring that the developing device developing contact 303 The developing contact 306 is brought into contact. At the same time, the developing device blade contact 304 connected to the toner leakage suppression blade (not shown) collides with the blade contact 305 arranged on the rotary side surface, and pushes the blade contact 305 toward the rotary side surface, so that the developing device blade contact 304 and the blade contact 305 are reliably formed. Contact.
[0017]
Here, the rotational position of the yellow developing device may slightly pass the developing position. Therefore, the yellow developing device is slightly reversed by a position correction mechanism (not shown) to return to the correct developing position. At this time, the developing device developing contact 303 pushes the developing contact 306 in a direction opposite to that in the forward rotation, so that the developing contact 306 is securely contacted. Similarly, the developing device blade contact 304 pushes the blade contact 305 in the direction opposite to that in the forward rotation, so that the contact is reliably made. After the yellow developing device completely stops at the developing position, a bias voltage is applied to the developing device sleeve and the blade from a power supply source (not shown) through the developing contact 306 and the blade contact 305, respectively, and the developing mechanism is pressed by a pressing mechanism (not shown). The sleeve is brought into contact with the photosensitive drum to develop the yellow latent image on the photosensitive drum. After the development is completed, the yellow developing device rotates away from the photosensitive drum and separates from the developing position to prepare for the next development. At the same time, the developing device developing contact 303 and the developing contact 306 are separated, and the developing device blade contact 304 and the blade contact 305 are separated.
[0018]
In this embodiment, the developing contact and the blade contact to which the present invention is applied have the same shape and are formed of one metal wire. Here, only the developing contact will be described. FIG. 2 is a view of the developing contact 306 shown in FIG. 1 as viewed from the center of rotation, and the features from when the yellow developing device 302 enters and stops at the developing position will be described. When developing the yellow latent image formed on the photoreceptor, the developing device enters in the illustrated direction (forward rotation direction), collides with the inclined portion 402 of about 45 degrees, and pushes the developing spring toward the rotary side surface. At this time, the winding part 401 is mainly deformed to reduce the impact force and prevent the contact from breaking. When the developing device rotates in the reverse direction (opposite to the illustrated direction) and stops at the developing position, the developing device contacts the inclined portion 404 and pushes the developing contact toward the rotary side surface. Here, the winding portion 405 is mainly deformed, and the contact is prevented from being broken due to stress distribution.
[0019]
(Second embodiment)
The second embodiment of the present invention relates to a static elimination contact member that eliminates electrostatic charges remaining in a developing device after the development process of the developing device in the color image forming apparatus of the first embodiment. FIG. 1 shows the arrangement. The static elimination contacts 307a and 307b are arranged at positions rotated by 180 degrees from the developing contact 306 and the blade contact 305 with respect to the rotation center of the developing device. From this arrangement relationship, for example, when developing in the order of yellow, cyan, magenta, and black, the yellow developing device rotates while being charged after the completion of development, and the developing contact 303 with the yellow developing device develops during magenta development. The device blade contacts 304 respectively contact the static elimination contact members 307a and 307b, and the static elimination is completed. Here, the relationship between the charge elimination position and the development position is 180 degrees, so that development and charge elimination can be performed simultaneously. It should be noted that the same effect can be obtained by setting 90 degrees and 270 degrees other than 180 degrees.
[0020]
FIG. 3 shows details of the static elimination contact. Since the charge removing members 307a and 307b have the same shape, only the charge removing member 307a is shown. FIG. 3 shows a view of the static elimination contact 307a shown in FIG. 1 as viewed from the center of rotation, and explains the characteristics of the yellow developing unit 302 from entering and stopping at the static elimination position. The neutralization member 307a is fixed at the center of the winding part 501 and can rotate only. The developing device enters in the illustrated direction (forward rotation direction), collides with the inclined portion 502, and pushes the charge removing member toward the rotary side surface. Mainly, the winding portion 506 is deformed to reduce the impact force. When the developing device rotates in the reverse direction and stops at the charge removing position, the developing device contacts the inclined portion 404 and pushes the developing contact toward the rotary side surface. Here, the winding part 507 is mainly deformed, and the contact is prevented from being broken due to stress distribution.
[0021]
【The invention's effect】
As described above, according to the first embodiment of the present invention, even if the developing device is switched, the bias to the developing sleeve roller and the blade of the developing device can be reliably applied, and the contact side which receives the shock may be damaged or broken. No problem, with durable and stable electrical contacts,
A stable developing operation can be obtained, and leakage of the developer can be suppressed.
[0022]
Further, according to the second embodiment of the present invention, even if the developing device is rotated after completion of the development, the residual charge of the developing device is discharged by the discharging contact before the next restart of the developing process. Spark discharge due to the accompanying contact can be reliably prevented.
[Brief description of the drawings]
FIG. 1 is an electrical contact diagram of an image forming apparatus to which the present invention is applied. FIG. 2 is a developing contact and a blade contact to which the present invention is applied. FIG. 3 is a static elimination contact to which the present invention is applied. Outline of forming apparatus [FIG. 5] Schematic diagram showing a schematic configuration of an example of a conventional developing device. [FIG. 6] Schematic diagram showing a schematic configuration of another example of a conventional developing device.
DESCRIPTION OF SYMBOLS 1 Photosensitive drum 3 Exposure means 4 Developing units 4Y, 4M, 4C, 4Bk Developing device 5 for each color I / O cartridge 8 Fixing device 301 Side surface of rotary 302 Yellow developing device 303 Developing device developing contact 304 Developing device blade contact 305 Developing contact 306 Blade contact 307a, 307b Static eliminating contact 401, 403, 405 Increasing portion 402, 404 of developing contact Winding portion 502, 504 of developing contact Increasing portion 501, 503, 505, 506, 507 of static eliminating contact Winding portion of static eliminating contact 100 Developing sleeve roller (developer carrier)
101 Voltage application body (power supply source)
102 contacts (high voltage contacts, contacts)
103 color developing unit 108 developing unit selection mechanism 200 developer leakage control body (various developer countermeasure blades)
201 Capacitor 202 Diode for AC high voltage application

Claims (4)

複数の現像器を保持して回転させるロータリー機構を備え、該ロータリーの回転により所定の現像器を順次像担持体との対峙位置に移動し、選択的に前記現像器を前記像担持体に当接離間させて、前記像担持体に形成された静電潜像を現像する電子写真画像形成装置において、
前記像担持体に形成された静電潜像を現像する際に、前記現像器に各種バイアス電圧を印加する接離可能な電気接点部材がロータリーの側面に対向して配置され、一本の金属線から形成されていて、前記ロータリーの正逆の各回転方向に対して、二つの傾斜と、傾斜による押し込み動作に対応した少なくとも2ヶ所の巻き部を設けたことを特徴とする電気接点部材。
A rotary mechanism for holding and rotating a plurality of developing devices is provided, and by rotating the rotary, a predetermined developing device is sequentially moved to a position facing the image carrier, and the developing device is selectively brought into contact with the image carrier. In an electrophotographic image forming apparatus for developing an electrostatic latent image formed on the image bearing member by contacting and separating,
When developing the electrostatic latent image formed on the image carrier, a contactable / separable electrical contact member that applies various bias voltages to the developing device is disposed to face the side surface of the rotary, and one metal An electric contact member formed from a wire, provided with two inclinations and at least two winding portions corresponding to the pushing operation by the inclinations in each of the forward and reverse rotation directions of the rotary.
各前記現像器が前記像担持体との対峙位置に移動した時に、前記現像器にバイアス電圧を印加できるように前記現像器の電気接点部にロータリーに固定された前記電気接点部材が接触し、前記現像器の現像後に、前記ロータリーの回転により、前記現像器が前記像担持体との対峙位置以外の位置に移動し、前記電気接点部材は現像器の電気接点部と離れることを特徴とする請求項1記載の電気接点部材。When each of the developing devices is moved to a position facing the image carrier, the electric contact member fixed to an electric contact portion of the developing device so as to apply a bias voltage to the developing device comes into contact with the developing device, After the development of the developing device, the rotation of the rotary causes the developing device to move to a position other than the position facing the image carrier, and the electric contact member is separated from the electric contact portion of the developing device. The electrical contact member according to claim 1. 複数の現像器を保持して回転させるロータリー機構を備え、該ロータリーの回転により所定の現像器を順次像担持体との対峙位置に移動し、選択的に前記現像器を前記像担持体に当接離間させて、前記像担持体に形成された静電潜像を現像する電子写真画像形成装置において、
前記現像器による現像動作終了後に、前記現像器内の残留電荷を除電する電気接点部材がロータリーの側面に対向して配置され、前記現像器の次回の現像処理開始までに残留電荷を除去する前記電気接点部材は一本の金属線から形成されていて、前記ロータリーの正逆の各回転方向に対して、二つの傾斜と、傾斜による押し込み動作に対応した少なくとも2ヶ所の巻き部を設けたことを特徴とする電気接点部材。
A rotary mechanism for holding and rotating a plurality of developing devices is provided, and by rotating the rotary, a predetermined developing device is sequentially moved to a position facing the image carrier, and the developing device is selectively brought into contact with the image carrier. In an electrophotographic image forming apparatus for developing an electrostatic latent image formed on the image bearing member by contacting and separating,
After completion of the developing operation by the developing device, an electric contact member for removing residual charges in the developing device is disposed to face a rotary side surface, and removes the residual charges before the next development process of the developing device starts. The electric contact member is formed from one metal wire, and has two inclined portions and at least two winding portions corresponding to the pushing operation by the inclined portions in each of the forward and reverse rotation directions of the rotary. An electrical contact member characterized by the above-mentioned.
前記現像器内の残留電荷を除去する前記電気接点は接離可能であり、残留電荷を保持する前記現像器上の各電器接点と接触して除電している時に、複数ある他の前記現像器の一つが前記像担持体と対峙する位置にあり、現像可能であることを特徴とする請求項3記載の電気接点部材。The electric contact for removing the residual electric charge in the developing device is detachable, and when the electric contact is removed by contacting each electric contact on the developing device holding the residual electric charge, a plurality of other developing devices are provided. 4. The electrical contact member according to claim 3, wherein one of said members is located at a position facing said image carrier and is developable.
JP2002280764A 2002-09-26 2002-09-26 Electrophotographic image forming apparatus and electric contact member Pending JP2004117806A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8275283B2 (en) 2008-09-01 2012-09-25 Canon Kabushiki Kaisha Cartridge with developer layer thickness regulating member and image forming apparatus including the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8275283B2 (en) 2008-09-01 2012-09-25 Canon Kabushiki Kaisha Cartridge with developer layer thickness regulating member and image forming apparatus including the same
US8401441B2 (en) 2008-09-01 2013-03-19 Canon Kabushiki Kaisha Cartridge and electrophotographic image forming apparatus

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