JP2002311690A - Electrifier, process cartridge and image forming device - Google Patents
Electrifier, process cartridge and image forming deviceInfo
- Publication number
- JP2002311690A JP2002311690A JP2001119255A JP2001119255A JP2002311690A JP 2002311690 A JP2002311690 A JP 2002311690A JP 2001119255 A JP2001119255 A JP 2001119255A JP 2001119255 A JP2001119255 A JP 2001119255A JP 2002311690 A JP2002311690 A JP 2002311690A
- Authority
- JP
- Japan
- Prior art keywords
- image
- charging roller
- image carrier
- charging
- forming apparatus
- 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.)
- Withdrawn
Links
Landscapes
- Control Or Security For Electrophotography (AREA)
- Electrophotography Configuration And Component (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、帯電装置とこれを
備えるプロセスカートリッジ及び画像形成装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging device, a process cartridge having the same, and an image forming apparatus.
【0002】[0002]
【従来の技術】従来、電子写真の帯電装置としてはコロ
ナ帯電器が使用されてきたが、近年、コロナ帯電器に代
って接触帯電装置が実用化されてきている。これは、低
オゾンと低電力を目的としており、中でも特に帯電部材
として導電ローラを用いたローラ帯電方式が帯電の安定
性という点で好ましいために広く用いられている。2. Description of the Related Art Conventionally, a corona charger has been used as a charging device for electrophotography. In recent years, however, a contact charging device has been put into practical use instead of a corona charger. This is intended for low ozone and low power, and among them, a roller charging method using a conductive roller as a charging member is particularly widely used because it is preferable in terms of charging stability.
【0003】ローラ帯電方式では、導電性の弾性ローラ
を複帯電体に加圧当接させ、これに電圧を印加すること
によって放電により被帯電体への帯電を行う。具体的に
は、放電開始電圧(OPC感光体に対して帯電ローラを
加圧当接させた場合には、約550V)に必要とされる
感光体表面電位Vdを足したDC電圧を印加することに
よって帯電を行うDC帯電方式、環境・耐久変動等によ
る電位の変動を改善する目的として必要とされる感光体
表面電位Vdに相当するDC電圧に放電開始電圧の2倍
以上のピーク間電圧を持つAC成分を重畳した電圧を接
触帯電部材に印加することによって帯電を行うAC帯電
方式がある。[0003] In the roller charging method, a conductive elastic roller is brought into pressure contact with a double charged body, and a voltage is applied thereto to charge the charged body by discharging. Specifically, a DC voltage obtained by adding the required photoconductor surface potential Vd to the discharge start voltage (about 550 V when the charging roller is pressed against the OPC photoconductor) is applied. DC charging method in which charging is performed by a DC voltage having a peak-to-peak voltage that is at least twice the discharge start voltage in a DC voltage corresponding to the photoconductor surface potential Vd required for the purpose of improving fluctuations in potential due to environmental and endurance fluctuations. There is an AC charging method in which charging is performed by applying a voltage on which an AC component is superimposed to a contact charging member.
【0004】しかし、この接触ローラ帯電方式において
も、弾性ローラを被帯電体である感光ドラムに当接・加
圧させた状態で機能させるという性格上、画像形成装置
の非動作時に弾性ローラが感光ドラムに当接・加圧した
まま放置された場合、更に厳しくはその放置された環境
が高温高湿環境であった場合、弾性ローラの当接部が歪
み、形状変形や抵抗の上昇を引き起こし、ハーフトーン
画像等にローラ周期のヨコスジ画像が発生する場合があ
った。However, even in this contact roller charging method, the elastic roller functions when the image forming apparatus is not operating because the elastic roller functions while being brought into contact with and pressed against the photosensitive drum which is the charged object. If it is left in contact with the drum and pressurized, and more strictly, if the left environment is a high-temperature and high-humidity environment, the contact part of the elastic roller will be distorted, causing shape deformation and increase in resistance. In some cases, a horizontal stripe image having a roller cycle is generated in a halftone image or the like.
【0005】従来、この帯電ローラ周期ヨコスジ画像の
発生に関しては、帯電ローラの改良、帯電ローラヘの加
圧を帯電ローラの浮きとのバランスを取りながら極力小
さくする等の対策が採られている。Heretofore, with respect to the generation of the charging roller cyclic horizontal stripe image, measures have been taken such as improving the charging roller and minimizing the pressure applied to the charging roller while maintaining the balance with the floating of the charging roller.
【0006】[0006]
【発明が解決しようとする課題】しかしながら、近年の
市場の高画質化、高速化の要求により、帯電のムラをよ
り拾い易い多階調画像が多用されるとともに、高速化に
帯電ローラの帯電能力が追いつかなくなってくると、同
程度の当接・加圧放置でも画像上にヨコスジが発生して
しまっていた。これに対し、図8に示すように別途帯電
ローラ102の当接・離間駆動装置140を設け、非画
像形成時に当接・離間駆動装置140によって帯電ロー
ラ102を感光ドラム101から離間させ、又、画像形
成時等の帯電処理が必要なときの前に当接・離間駆動装
置140によって帯電ローラ102を感光ドラム101
に当接させるという対策例がある。However, in response to recent demands for higher image quality and higher speed in the market, multi-gradation images in which charging unevenness is more easily picked up are frequently used, and the charging ability of the charging roller is required to increase the speed. When it became impossible to catch up, a horizontal streak appeared on the image even with the same level of contact and pressure. On the other hand, as shown in FIG. 8, a contact / separation driving device 140 for the charging roller 102 is separately provided, and the charging roller 102 is separated from the photosensitive drum 101 by the contact / separation driving device 140 during non-image formation. The contact / separation driving device 140 causes the charging roller 102 to move the charging roller 102
There is a countermeasure example of contacting the contact.
【0007】しかし、上記対策例においても、感光ドラ
ム101の回転駆動装置や紙搬送駆動装置の他に別途当
接・離間駆動装置140が必要になるためにコストアッ
プとなり、又、その機構のために帯電ローラ102と感
光ドラム101等を一体的に収容して画像形成装置に対
して着脱自在としたプロセスカートリッジには搭載しに
くい等の問題がある。However, even in the above countermeasures, the contact / separation drive device 140 is required separately in addition to the rotation drive device of the photosensitive drum 101 and the paper conveyance drive device, which increases the cost. In addition, there is a problem that it is difficult to mount the charging roller 102 and the photosensitive drum 101 and the like in a process cartridge which is housed integrally and is detachable from the image forming apparatus.
【0008】本発明は上記問題に鑑みてなされたもの
で、その目的とする処は、別途帯電ローラの当接・離間
駆動装置を設けることなく、加圧当接放置に起因する帯
電ローラ周期のハーフトーンヨコスジ画像の発生を安価
な構成によって防ぐことができる帯電装置、プロセスカ
ートリッジ及び画像形成装置を提供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a charging roller contact / separation driving apparatus which does not separately provide a charging roller contact / separation driving device. An object of the present invention is to provide a charging device, a process cartridge, and an image forming apparatus that can prevent the generation of a halftone horizontal stripe image with an inexpensive configuration.
【0009】[0009]
【課題を解決するための手段】上記目的を達成するた
め、請求項1記載の発明は、像担持体に接触する帯電ロ
ーラに電圧を印加することによって像担持体表面を一定
電位に帯電処理する帯電装置において、前記帯電ローラ
の像担持体への加圧のON/OFF又は当接/離間を像
担持体の回転駆動に連動して行う機構を設けたことを特
徴とする。In order to achieve the above object, according to the first aspect of the present invention, the surface of the image bearing member is charged to a constant potential by applying a voltage to a charging roller contacting the image bearing member. The charging device is characterized in that a mechanism is provided for turning ON / OFF or abutting / separating pressing of the charging roller against the image carrier in conjunction with rotation driving of the image carrier.
【0010】請求項2記載の発明は、請求項1記載の発
明において、予め決められたタイミングで前記像担持体
を回転駆動して前記帯電ローラの離間を行うことを特徴
とする。According to a second aspect of the present invention, in the first aspect of the invention, the image bearing member is rotated at a predetermined timing to separate the charging roller.
【0011】請求項3記載の発明は、請求項2記載の発
明において、前記像担持体の回転駆動の正回転時に前記
帯電ローラの像担持体への加圧ON又は当接を行い、像
担持体の回転駆動の逆回転時に帯電ローラの像担持体へ
の加圧OFF又は離間を行うことを特徴とする。According to a third aspect of the present invention, in the second aspect of the present invention, the charging roller is turned on or abutted on the image carrier during normal rotation of the image carrier to rotate the image carrier. It is characterized in that the charging roller is pressed off or separated from the image carrier at the time of reverse rotation of the rotation of the body.
【0012】請求項4記載の発明は、請求項2又は3記
載の発明において、前記像担持体を回転駆動して前記帯
電ローラの加圧OFF又は離間を行うタイミングを電源
OFF時又は電源OFF時から一定時間後としたことを
特徴とする。According to a fourth aspect of the present invention, in the second or third aspect of the present invention, the timing at which the image bearing member is rotationally driven to turn off or separate the charging roller is turned off when the power is turned off or when the power is turned off. After a certain period of time.
【0013】請求項5記載の発明は、請求項2又は3記
載の発明において、前記像担持体を回転駆動して前記帯
電ローラの加圧OFF又は離間を行うタイミングを画像
形成動作後一定時間後としたことを特徴とする。According to a fifth aspect of the present invention, in the second or third aspect of the present invention, the timing for rotating the image bearing member to turn off or separate the charging roller by a predetermined time after the image forming operation is performed. It is characterized by having.
【0014】請求項6記載の発明は、請求項2又は3記
載の発明において、前記像担持体を回転駆動して前記帯
電ローラの加圧OFF又は離間を行うタイミングをスリ
ープモード移行時又はスリープモード移行時から一定時
間後としたことを特徴とする。According to a sixth aspect of the present invention, in the second or third aspect of the present invention, the timing at which the image bearing member is rotationally driven to turn off or separate the charging roller is shifted to a sleep mode or a sleep mode. It is characterized by being a certain time after the transition.
【0015】請求項7記載の発明は、請求項2又は3記
載の発明において、前記像担持体を回転駆動して前記帯
電ローラの加圧OFF又は離間を行うタイミングをジャ
ム発生時又はジャム発生時から一定時間後としたことを
特徴とする。According to a seventh aspect of the present invention, in the second or third aspect of the present invention, the timing at which the image bearing member is rotationally driven to turn off or separate the charging roller is determined when a jam occurs or when a jam occurs. After a certain period of time.
【0016】請求項8記載の発明は、請求項2又は3記
載の発明において、前記像担持体を回転駆動して前記帯
電ローラの加圧OFF又は離間を行うタイミングをユー
ザーからの指示発生時としたことを特徴とする。According to an eighth aspect of the present invention, in the second or third aspect of the present invention, the timing at which the image carrier is rotationally driven to turn off or separate the charging roller from the time when a user's instruction is issued is set. It is characterized by having done.
【0017】請求項9記載の発明は、請求項2又は3記
載の発明において、前記像担持体を回転駆動して前記帯
電ローラの加圧OFF又は離間を行うタイミングを画像
形成装置からの当該帯電装置の取り出し時としたことを
特徴とする。According to a ninth aspect of the present invention, in accordance with the second or third aspect of the present invention, the timing at which the image bearing member is rotationally driven to turn off or separate the pressure of the charging roller is determined by the timing of the charging from the image forming apparatus. It is characterized by taking out the device.
【0018】請求項10記載の発明は、像担持体に接触
する帯電ローラに電圧を印加することによって像担持体
表面を一定電位に帯電処理する帯電装置において、前記
像担持体の回転駆動の正回転時に前記帯電ローラの前記
像担持体への加圧ON又は当接を行い、像担持体の回転
駆動の逆回転時に帯電ローラの像担持体への加圧OFF
又は離間を行う機構を設けたことを特徴とする。According to a tenth aspect of the present invention, there is provided a charging device for charging a surface of an image carrier to a constant potential by applying a voltage to a charging roller contacting the image carrier. Pressing the charging roller against the image carrier or contacting the charging roller during rotation, and pressing off the charging roller against the image carrier during reverse rotation of the image carrier.
Alternatively, a mechanism for performing separation is provided.
【0019】請求項11記載の発明は、プロセスカート
リッジを、請求項1〜9の何れかに記載の帯電装置と、
少なくとも像担持体を一体的に収容し、画像形成装置本
体に対して着脱自在に構成したことを特徴とする。According to an eleventh aspect of the present invention, there is provided a process cartridge comprising: the charging device according to any one of the first to ninth aspects;
It is characterized in that at least the image carrier is integrally accommodated and is configured to be detachable from the image forming apparatus main body.
【0020】請求項12記載の発明は、プロセスカート
リッジを、請求項10記載の帯電装置と、少なくとも像
担持体を一体的に収容し、画像形成装置本体に対して着
脱自在に構成したことを特徴とする。According to a twelfth aspect of the present invention, the process cartridge houses the charging device of the tenth aspect and at least the image carrier integrally, and is configured to be detachable from the image forming apparatus main body. And
【0021】請求項13記載の発明は、像担持体と、該
像担持体に接触する帯電ローラに電圧を印加することに
よって像担持体表面を一定電位に帯電処理する帯電装置
と、帯電処理された像担持体に静電潜像を記録する露光
手段と、像担持体上の静電潜像を現像剤により現像処理
する現像手段を有する画像形成装置において、前記帯電
ローラの像担持体への加圧のON/OFF又は当接/離
間を像担持体の回転駆動に連動して行う機構を設けたこ
とを特徴とする。According to a thirteenth aspect of the present invention, there is provided a charging device for charging a surface of an image bearing member to a constant potential by applying a voltage to an image bearing member and a charging roller contacting the image bearing member. In an image forming apparatus having an exposure unit that records an electrostatic latent image on an image carrier, and a developing unit that develops the electrostatic latent image on the image carrier with a developer, the charging roller applies a charge to the image carrier. A feature is provided in which a mechanism for turning ON / OFF or contacting / separating the pressurization in conjunction with the rotational driving of the image carrier is provided.
【0022】請求項14記載の発明は、像担持体と、該
像担持体に接触する帯電ローラに電圧を印加することに
よって像担持体表面を一定電位に帯電処理する帯電装置
と、帯電処理された像担持体に静電潜像を記録する露光
手段と、像担持体上の静電潜像を現像剤により現像処理
する現像手段を有する画像形成装置において、前記像担
持体の回転駆動の正回転時に前記帯電ローラの前記像担
持体への加圧ON又は当接を行い、像担持体の回転駆動
の逆回転時に帯電ローラの像担持体への加圧OFF又は
離間を行う機構を設けたことを特徴とする。According to a fourteenth aspect of the present invention, there is provided a charging device for charging a surface of an image bearing member to a constant potential by applying a voltage to an image bearing member and a charging roller contacting the image bearing member. In an image forming apparatus having an exposure unit that records an electrostatic latent image on an image carrier and a developing unit that develops the electrostatic latent image on the image carrier with a developer, the rotation of the image carrier is positive. A mechanism is provided that turns on or abuts the charging roller against the image carrier during rotation, and turns off or separates the pressure of the charging roller against the image carrier during reverse rotation of the rotation of the image carrier. It is characterized by the following.
【0023】請求項15記載の発明は、像担持体と、該
像担持体に接触する帯電ローラに電圧を印加することに
よって像担持体表面を一定電位に帯電処理する帯電装置
と、帯電処理された像担持体に静電潜像を記録する露光
手段と、像担持体上の静電潜像を現像剤により現像処理
する現像手段を有する画像形成装置において、前記帯電
ローラ前記像担持体への加圧のON/OFF又は当接/
離間を像担持体の回転駆動と連動して行う機構を設け、
予め決められたタイミングで像担持体を回転駆動して帯
電ローラの加圧OFF又は離間を行うことを特徴とす
る。According to a fifteenth aspect of the present invention, there is provided a charging device for charging a surface of an image carrier to a constant potential by applying a voltage to an image carrier and a charging roller in contact with the image carrier. An exposure unit for recording an electrostatic latent image on the image carrier, and a developing unit for developing the electrostatic latent image on the image carrier with a developer. ON / OFF of pressure or contact /
A mechanism is provided to perform the separation in conjunction with the rotation drive of the image carrier,
The image bearing member is rotated at a predetermined timing to turn off or separate the pressure of the charging roller.
【0024】請求項16記載の発明は、請求項15又は
16記載の発明において、前記像担持体の回転駆動の正
回転時に前記帯電ローラの像担持体への加圧ON又は当
接を行い、像担持体の回転駆動の逆回転時に帯電ローラ
の像担持体への加圧OFF又は離間を行うことを特徴と
する。According to a sixteenth aspect of the present invention, in the invention according to the fifteenth or sixteenth aspect, the charging roller is pressurized on or abutted on the image carrier at the time of forward rotation of the image carrier. It is characterized in that the charging roller is pressed off or separated from the image carrier at the time of reverse rotation of the rotation of the image carrier.
【0025】請求項17記載の発明は、請求項15又は
16記載の発明において、前記像担持体を回転駆動して
前記帯電ローラの加圧OFF又は離間を行うタイミング
を電源OFF時又は電源OFF時から一定時間後とした
ことを特徴とする。According to a seventeenth aspect of the present invention, in the invention according to the fifteenth or sixteenth aspect, the timing at which the image carrier is rotationally driven to turn off or separate the charging roller is turned off when the power is turned off or when the power is turned off. After a certain period of time.
【0026】請求項18記載の発明は、請求項15又は
16記載の発明において、前記像担持体を回転駆動して
前記帯電ローラの加圧OFF又は離間を行うタイミング
を画像形成動作後一定時間後としたことを特徴とする。According to an eighteenth aspect of the present invention, in the invention of the fifteenth or sixteenth aspect, the timing at which the image bearing member is driven to rotate to turn off or separate the charging roller is fixed for a predetermined time after the image forming operation. It is characterized by having.
【0027】請求項19記載の発明は、請求項15又は
16記載の発明において、前記像担持体を回転駆動して
前記帯電ローラの加圧OFF又は離間を行うタイミング
をスリープモード移行時又はスリープモード移行時から
一定時間後としたことを特徴とする。According to a nineteenth aspect of the present invention, in the invention according to the fifteenth or sixteenth aspect, the timing for rotating the image carrier to turn off or separate the charging roller by pressing the sleep mode is changed to a sleep mode or a sleep mode. It is characterized by being a certain time after the transition.
【0028】請求項20記載の発明は、請求項15又は
16記載の発明において、前記像担持体を回転駆動して
前記帯電ローラ状の加圧OFF又は離間を行うタイミン
グをジャム発生時又はジャム発生時から一定時間後とし
たことを特徴とする。According to a twentieth aspect of the present invention, in the invention according to the fifteenth or sixteenth aspect, the timing at which the image carrier is rotationally driven to turn off or separate the charging roller is pressurized or jammed. It is characterized by being a certain time after the time.
【0029】請求項21記載の発明は、請求項15又は
16記載の発明において、前記像担持体を回転駆動して
前記帯電ローラの加圧OFF又は離間を行うタイミング
をユーザーからの指示発生時としたことを特徴とする。According to a twenty-first aspect of the present invention, in the invention of the fifteenth or sixteenth aspect, the timing at which the image carrier is rotationally driven to turn off or separate the pressure of the charging roller is determined when a user's instruction is issued. It is characterized by having done.
【0030】請求項22記載の発明は、請求項15又は
16記載の発明において、前記像担持体を回転駆動して
前記帯電ローラの加圧OFF又は離間を行うタイミング
を当該画像形成装置からの前記帯電装置の取り出し時と
したことを特徴とする。According to a twenty-second aspect of the present invention, in the invention according to the fifteenth or sixteenth aspect, the timing at which the image bearing member is rotationally driven to turn off or separate the pressure of the charging roller is determined by the image forming apparatus. It is characterized by taking out the charging device.
【0031】[0031]
【発明の実施の形態】以下に本発明の実施の形態を添付
図面に基づいて説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【0032】<実施の形態1>図1は本発明に係る画像
形成装置であるレーザプリンタの概略断面図、図2は同
レーザプリンタの帯電ローラ部分の拡大図である。<First Embodiment> FIG. 1 is a schematic sectional view of a laser printer as an image forming apparatus according to the present invention, and FIG. 2 is an enlarged view of a charging roller portion of the laser printer.
【0033】本実施の形態に係る画像形成装置(レーザ
プリンタ)は、パーソナルコンピュターやワークステー
ション等のホストと接続されており(図示せず)、該ホ
ストからのプリント要求によりビデオインターフェース
を介して画像データを受け取る。この画像データに基づ
いて本実施の形態に係る画像形成装置は、従来と同様
に、イエロー(Y)、マゼンタ(M)、シアン(C)及
びブラック(K)の4色に分解した画像データにより順
次各色のトナー像形成し、それらを中間転写体上に重ね
合わせて紙等の転写材107に一括転写してフルカラー
画像を得るものである。The image forming apparatus (laser printer) according to the present embodiment is connected to a host such as a personal computer or a workstation (not shown), and receives an image via a video interface in response to a print request from the host. Receive data. Based on this image data, the image forming apparatus according to the present embodiment uses image data separated into four colors of yellow (Y), magenta (M), cyan (C), and black (K) in the same manner as in the related art. A toner image of each color is sequentially formed, and the toner images are superimposed on an intermediate transfer member and collectively transferred to a transfer material 107 such as paper to obtain a full-color image.
【0034】図1において、101は所定の周速度(8
0mm/s)で矢印A方向に回転駆動される第1の像担
持体としての感光ドラム(外径100mmのアルミ製シ
リンダ上に有機感光材料による感光層を形成たもの)で
あり、先ず、その表面は帯電手段である帯電ローラ10
2によって約−600Vに一様に帯電される。In FIG. 1, reference numeral 101 denotes a predetermined peripheral speed (8
0 mm / s) is a photosensitive drum (a photosensitive layer formed of an organic photosensitive material on an aluminum cylinder having an outer diameter of 100 mm) as a first image carrier that is driven to rotate in the direction of arrow A at 0 mm / s). The surface is a charging roller 10 serving as charging means.
2 is uniformly charged to about -600 V.
【0035】次に、第1色目(Y)の画像データに応じ
てON/OFF制御された露光手段103による走査が
施され、感光ドラム101上に第1色目の静電潜像が形
成される(露光部電位は約−100V)。この第1色目
の静電潜像は、第1色目のYトナー(極性−)を内包し
た第1の現像手段104aによって現像されて第1のト
ナー像として可視化される。Next, scanning is performed by the exposure unit 103, which is ON / OFF controlled in accordance with the image data of the first color (Y), and an electrostatic latent image of the first color is formed on the photosensitive drum 101. (The exposed portion potential is about -100 V). The first-color electrostatic latent image is developed by the first developing unit 104a including the first-color Y toner (polarity-), and is visualized as a first toner image.
【0036】そして、可視化された第1のトナー像は、
第1の像担持体である感光ドラム101に所定の押圧力
をもって圧接され、感光ドラム101の周速度と略等遠
の速度(80mm/s)をもって矢印B方向に回転駆動
される第2の像担持休としての中間転写体105(アル
ミ製シリンダ上にNBRゴム等から成る導電弾性層の表
面にカーボン、フッ素樹脂等を分散したウレタン樹脂か
ら成る離型性を有する表層を形成し、抵抗値を105〜
10Ω・cm程度とし、外径を153mmとしたもの)と
のニップ部において中間転写体105表面に転写(1次
転写)される。このとき、中間転写体105に対して
は、トナーの帯電極性(−)とは逆極性で予め一意的に
設定された電圧V1tr (+100V)が印加される。1
次転写の際に転写されないで感光ドラム101上に残っ
たトナーは、感光ドラム101に圧接されたクリーニン
グ手段であるクリーニングブレード108によって掻き
取られて廃トナー容器109に回収される。Then, the visualized first toner image is
A second image that is pressed against the photosensitive drum 101 as the first image carrier with a predetermined pressing force and is driven to rotate in the direction of arrow B at a speed (80 mm / s) substantially equal to the peripheral speed of the photosensitive drum 101. The intermediate transfer member 105 serving as a support member (a surface layer of a conductive elastic layer made of NBR rubber or the like formed on an aluminum cylinder having a releasable surface layer made of urethane resin in which carbon, fluorine resin, etc. is dispersed, and having a resistance value of 10 5 ~
The transfer is performed (primary transfer) on the surface of the intermediate transfer member 105 at a nip portion of about 10 Ω · cm and an outer diameter of 153 mm. At this time, a voltage V1tr (+100 V) uniquely set in advance and having a polarity opposite to the toner charging polarity (−) is applied to the intermediate transfer member 105. 1
The toner remaining on the photosensitive drum 101 without being transferred at the time of the next transfer is scraped off by a cleaning blade 108, which is a cleaning unit pressed against the photosensitive drum 101, and collected in a waste toner container 109.
【0037】而して、以上の工程が残りの3色(M、
C、K)についても同様に繰り返され、その都度、第2
の現像手段104b、第3の現像手段104c、第4の
現像手段104dに各々内包された色の異なる現像剤に
よるトナー像が中間転写体105の表面に順次静電転写
されて積層されることによってカラー画像が形成され
る。このカラー画像は、中間転写体105と、これに所
定のタイミングで圧接されて中間転写体105の周速度
と略同等の速度で回転される接離可能な転写手段として
の転写ローラ106とのニップ部において、給紙部より
搬送されてくる転写材107表面に一括転写(2次転
写)される。このとき、転写ローラ106に対しては、
トナーの帯電極性とは逆極性で予め一意的に設定された
電圧Vtr(+1000V)が印加される。Thus, the above steps are performed for the remaining three colors (M,
C, K) is repeated in the same manner, and each time, the second
Are electrostatically transferred to the surface of the intermediate transfer member 105 and sequentially laminated by toner images of developers of different colors included in the developing unit 104b, the third developing unit 104c, and the fourth developing unit 104d. A color image is formed. A nip of the color image is formed between an intermediate transfer member 105 and a transfer roller 106 serving as a detachable transfer unit that is pressed against the intermediate transfer member 105 at a predetermined timing and rotated at a speed substantially equal to the peripheral speed of the intermediate transfer member 105. The transfer is performed collectively (secondary transfer) on the surface of the transfer material 107 conveyed from the paper supply unit. At this time, the transfer roller 106 is
A voltage Vtr (+1000 V) uniquely set in advance with a polarity opposite to the charging polarity of the toner is applied.
【0038】その後、転写材107は定着手段112に
搬送され、4色のトナー像は転写材107に永久定着さ
れ、トナー像が定着された転写材107は排紙部より機
外に排出されて所望のプリント画像が得られる。Thereafter, the transfer material 107 is conveyed to the fixing means 112, and the four color toner images are permanently fixed to the transfer material 107, and the transfer material 107 on which the toner images are fixed is discharged out of the apparatus from the paper discharge unit. A desired print image is obtained.
【0039】又、2次転写の際に転写されないで中間転
写体105上に残ったトナーは、不図示のトナー電荷制
御部材により帯電極性を制御された後、中間転写体10
5と感光ドラム101との電位差により感光ドラム10
1側に戻され、感光ドラム101上に配設されたクリー
ニングブレード108によって掻き取られて廃トナー容
器109に回収される。The toner remaining on the intermediate transfer member 105 without being transferred at the time of the secondary transfer is subjected to charge polarity control by a toner charge control member (not shown).
5 and the photosensitive drum 101 due to a potential difference between the photosensitive drum 10 and the photosensitive drum 101.
The toner is returned to the first side, is scraped off by a cleaning blade 108 disposed on the photosensitive drum 101, and is collected in a waste toner container 109.
【0040】上記感光ドラム101及び帯電ローラ10
2、クリーニングブレード108、廃トナー容器109
及び後述の帯電ローラ当接・離間部材120は1つのプ
ロセスカートリッジ(感光ドラムカートリッジ)110
として画像形成装置本体に対して着脱自在に構成されて
いる。又、イエロー(Y)、マゼンタ(M)、シアン
(C)、ブラック(K)の各現像手段104(104
a,104b,104c,104d)はそれぞれ1つの
プロセスカートリッジ(現像カートリッジ)としてその
消耗度合いにより別々に交換可能となっている。The photosensitive drum 101 and the charging roller 10
2. Cleaning blade 108, waste toner container 109
In addition, a charging roller contacting / separating member 120 described later is a single process cartridge (photosensitive drum cartridge) 110.
Is configured to be detachable from the image forming apparatus main body. Each of the yellow (Y), magenta (M), cyan (C), and black (K) developing means 104 (104
a, 104b, 104c, and 104d) can be separately replaced as one process cartridge (developing cartridge) depending on the degree of consumption.
【0041】帯電ローラ102は、図2に詳細に示すよ
うに、金属製の軸102aとスポンジ材から成る基層1
02b及び表面高抵抗層102cから成り、軸受部材1
23を介して加圧バネ124により感光ドラム101に
加圧当接されている。加圧バネ124は、帯電ローラ1
02の感光ドラム101への当接総圧が1.0kgfに
なるように調整されている。又、帯電ローラ軸102a
には帯電ローラ102の当接・離間を行うための帯電ロ
ーラ当接・離間部材120が帯電ローラ軸102aに対
して回転自在に取り付けられている。この帯電ローラ当
接・離間部材120の先端には、感光ドラム101の長
手両端に設けられたギヤ部122に噛み合う突起121
が設けられている。As shown in detail in FIG. 2, the charging roller 102 includes a metal shaft 102a and a base layer 1 made of a sponge material.
02b and the surface high resistance layer 102c, and the bearing member 1
The photosensitive drum 101 is pressed against the photosensitive drum 101 via a pressing spring 124 via the reference numeral 23. The pressurizing spring 124 is connected to the charging roller 1.
02 is adjusted so that the total contact pressure against the photosensitive drum 101 becomes 1.0 kgf. Also, the charging roller shaft 102a
A charging roller contacting / separating member 120 for contacting / separating the charging roller 102 is rotatably attached to the charging roller shaft 102a. At the tip of the charging roller contacting / separating member 120, a projection 121 that meshes with gear portions 122 provided at both longitudinal ends of the photosensitive drum 101.
Is provided.
【0042】次に、本発明の要旨を構成する帯電ローラ
当接・離間部材120による感光ドラム101の回転駆
動に連動した帯電ローラ102の当接・離間動作を図3
に基づいて説明する。Next, the contact / separation operation of the charging roller 102 in conjunction with the rotation drive of the photosensitive drum 101 by the charging roller contact / separation member 120 constituting the gist of the present invention is shown in FIG.
It will be described based on.
【0043】非画像形成時等の感光ドラム101の回転
停止時には、帯電ローラ当接・離間部材120は図3
(a)に示すように帯電ローラ102の加圧方向と並行
に配置(ホームポジション)されており、このとき帯電
ローラ102は加圧方向と逆方向に押されるために感光
ドラム101に対して約0.5mmの間隔で離間してい
る。When the rotation of the photosensitive drum 101 is stopped at the time of non-image formation or the like, the charging roller contact / separation member 120 is moved to the position shown in FIG.
As shown in (a), the charging roller 102 is arranged in parallel with the pressing direction of the charging roller 102 (home position). At this time, since the charging roller 102 is pressed in the direction opposite to the pressing direction, it is approximately They are separated by an interval of 0.5 mm.
【0044】画像形成時等に感光ドラム101が矢印A
方向に回転駆動されると、該感光ドラム101のギヤ部
122と帯電ローラ当接・離間部材120先端の突起1
21の噛み合いにより、帯電ローラ当接・離間部材12
0は図3(b)に示すように帯電ローラ102の軸10
2aを中心として矢印A’方向に回転する。すると、帯
電ローラ102の軸102aを支えていた帯電ローラ当
接・離間部材120の影響がなくなり、帯電ローラ10
2は加圧バネ124によって感光ドラム101に対して
所定量の加圧力にて加圧当接される。At the time of image formation or the like, the photosensitive drum 101
When driven in the direction, the gear 1 of the photosensitive drum 101 and the protrusion 1
21, the charging roller contact / separation member 12
0 is the axis 10 of the charging roller 102 as shown in FIG.
It rotates around arrow 2a in the direction of arrow A '. Then, the influence of the charging roller contacting / separating member 120 supporting the shaft 102a of the charging roller 102 is eliminated, and the charging roller 10
2 is pressed against the photosensitive drum 101 with a predetermined amount of pressing force by a pressing spring 124.
【0045】又、画像形成終了時等の感光ドラム101
の回転停止時には、画像形成装置は感光ドラム101を
図3(c)の矢印B方向に所定量だけ逆回転させ、該感
光ドラム101のギヤ部122と帯電ローラ当接・離間
部材120先端の突起121の噛み合いにより帯電ロー
ラ当接・離間部材120を図示矢印B’方向に回転させ
てホームポジションに戻し、帯電ローラ102を感光ド
ラム101に対して約0.5mm離間した状態を作り出
す。The photosensitive drum 101 at the end of image formation or the like
When the rotation of the photosensitive drum 101 is stopped, the image forming apparatus reversely rotates the photosensitive drum 101 in the direction of arrow B in FIG. 3C by a predetermined amount, and the gear 122 of the photosensitive drum 101 and the protrusion at the tip of the charging roller contact / separation member 120. Due to the engagement of 121, the charging roller contacting / separating member 120 is rotated in the direction of arrow B 'in the drawing to return to the home position, and a state is created in which the charging roller 102 is separated from the photosensitive drum 101 by about 0.5 mm.
【0046】以上の構成により、帯電処理が必要となる
感光ドラム101の回転時以外は帯電ローラ102が感
光ドラム101に当接しないため、放置に起因する帯電
ローラ周期のハーフトーンヨコスジ画像の発生を防ぐこ
とができる。According to the above configuration, the charging roller 102 does not come into contact with the photosensitive drum 101 except when the photosensitive drum 101 needs to be charged, so that a halftone horizontal stripe image of the charging roller cycle caused by leaving is generated. Can be prevented.
【0047】又、帯電ローラ102の当接・離間を行わ
ない従来の構成に対して追加部材としては感光ドラム1
01のギヤ部122と帯電ローラ当接・離間部材120
のみとなるため、帯電ローラの当接・離間駆動装置を別
途設けるのに比べて非常に安価で簡易な構成とすること
ができ、斯かる構成のプロセスカートリッジ110ヘの
導入も容易である。In addition to the conventional structure in which the contact and separation of the charging roller 102 are not performed, the photosensitive drum 1
01 and the charging roller contact / separation member 120
Therefore, the configuration can be made very inexpensive and simple as compared with the case where a contact / separation drive device for the charging roller is separately provided, and introduction into the process cartridge 110 having such a configuration is also easy.
【0048】<実施の形態2>次に、本発明の実施の形
態2について説明する。Second Embodiment Next, a second embodiment of the present invention will be described.
【0049】図4は本実施の形態に係るレーザプリンタ
の帯電ローラ部分の拡大図である。尚、本実施の形態に
係るレーザプリンタの画像形成プロセスは前記実施の形
態1と同様であるため、これについての再度の説明は省
略する。FIG. 4 is an enlarged view of a charging roller portion of the laser printer according to the present embodiment. Note that the image forming process of the laser printer according to the present embodiment is the same as that of the first embodiment, and the description thereof will not be repeated.
【0050】又、実施の形態1と同様に、感光ドラム1
01、帯電ローラ102、クリーニングブレード10
8、廃トナー容器109及び後述の帯電ローラ加圧ON
/OFF部材125は、1つのプロセスカートリッジ
(感光ドラムカートリッジ)110として画像形成装置
に対して着脱自在に構成されている。Also, as in the first embodiment, the photosensitive drum 1
01, charging roller 102, cleaning blade 10
8. Waste toner container 109 and charging roller pressurization described later ON
The / OFF member 125 is detachably configured as one process cartridge (photosensitive drum cartridge) 110 with respect to the image forming apparatus.
【0051】前記実施の形態1が感光ドラム101の回
転駆動と連動して帯電ローラ102の当接・離間動作を
行っていたのに対し、本実施の形態では、帯電ローラ1
02の加圧のON/OFF(加圧力の増減)を同じよう
に感光ドラム101の回転駆動と連動して行う機構を設
けている。In the first embodiment, the contact and separation operations of the charging roller 102 are performed in conjunction with the rotation of the photosensitive drum 101. In the present embodiment, the charging roller 1
In the same manner, a mechanism for turning ON / OFF (increase / decrease of pressurizing force) 02 pressurization in conjunction with the rotation driving of the photosensitive drum 101 is provided.
【0052】帯電ローラ102は、実施の形態1と同様
に金属製の軸102aとスポンジ材から成る基層102
b及び表面高抵抗層102cから成り、軸受部材123
を介して加圧バネ124によって感光ドラム101に加
圧当接されている。加圧バネ124は、加圧バネ支持部
材127により支持されており、該加圧バネ支持部材1
27は帯電ローラ加圧ON/OFF部材125のカム1
28によって加圧ON位置又は加圧OFF位置に制御さ
れ、帯電ローラ102の感光ドラム101への当接総圧
が加圧ON位置で1.0kgf、加圧OFF位置で0.
3kgf以下になるように調整されている。As in the first embodiment, the charging roller 102 has a metal shaft 102a and a base layer 102 made of a sponge material.
b and the surface high-resistance layer 102c.
, And is pressed against the photosensitive drum 101 by a pressure spring 124. The pressure spring 124 is supported by a pressure spring support member 127.
Reference numeral 27 denotes a cam 1 of the charging roller pressing ON / OFF member 125.
28, the charging roller 102 is controlled to the pressure ON position or the pressure OFF position, and the total contact pressure of the charging roller 102 against the photosensitive drum 101 is 1.0 kgf at the pressure ON position and 0.5 kg at the pressure OFF position.
It is adjusted to be 3 kgf or less.
【0053】感光ドラムカートリッジ枠休には帯電ロー
ラ102の加圧ON/OFFを行うための前記帯電ロー
ラ加圧ON/OFF部材125が回転自在に取り付けら
れている。この帯電ローラ加圧ON/OFF部材125
の先端には、感光ドラム101の長手両端に設けられた
ギヤ部122に噛み合う突起126が設けられ、帯電ロ
ーラ加圧ON/OFF部材125の回転軸には前記加圧
バネ支持部材127の位置を制御するカム128が設け
られている。129は帯電ローラ加圧ON/OFF部材
125のホームポジションを決定する位置決め部材であ
り、この位置決め部材129は、加圧バネ124の反力
により帯電ローラ加圧ON/OFF部材125が必要以
上に上流側に回転するのを防止する。The charging roller pressure ON / OFF member 125 for turning ON / OFF the pressure of the charging roller 102 is rotatably mounted on the photosensitive drum cartridge frame. This charging roller pressing ON / OFF member 125
A protrusion 126 is provided at the end of the photosensitive drum 101 so as to mesh with the gear portions 122 provided at both longitudinal ends of the photosensitive drum 101. The position of the pressure spring support member 127 is set on the rotation axis of the charging roller pressure ON / OFF member 125. A controlling cam 128 is provided. Reference numeral 129 denotes a positioning member that determines the home position of the charging roller pressing ON / OFF member 125. The positioning member 129 causes the charging roller pressing ON / OFF member 125 to be unnecessarily upstream due to the reaction force of the pressing spring 124. Prevents side rotation.
【0054】次に、本発明の要旨を構成する帯電ローラ
加圧ON/OFF部材125による感光ドラム101の
回転駆動に連動した帯電ローラ102の加圧ON/OF
F動作を図5に基づいて説明する。Next, the pressing ON / OF of the charging roller 102 in conjunction with the rotation driving of the photosensitive drum 101 by the charging roller pressing ON / OFF member 125 constituting the gist of the present invention.
The F operation will be described with reference to FIG.
【0055】非画像形成時等の感光ドラム101の回転
停止時には、帯電ローラ加圧ON/OFF部材125は
図5(a)に示すように感光ドラム101の回転方向
(矢印A方向)に対して帯電ローラ102の上流側に配
置(ホームポジション)されており、このとき加圧バネ
支持部材127は帯電ローラ加圧ON/OFF部材12
5のカム128により加圧OFF位置に制御されてお
り、帯電ローラ102の感光ドラム101への当接総圧
は0.3kgf以下になっている。When the rotation of the photosensitive drum 101 is stopped during non-image formation or the like, the charging roller pressurizing ON / OFF member 125 moves in the rotation direction of the photosensitive drum 101 (direction of arrow A) as shown in FIG. It is arranged (home position) on the upstream side of the charging roller 102, and at this time, the pressing spring support member 127 is
5 is controlled to the pressure OFF position by the cam 128, and the total contact pressure of the charging roller 102 with the photosensitive drum 101 is 0.3 kgf or less.
【0056】一方、画像形成時等に感光ドラム101が
矢印A方向に回転駆動されると、該感光ドラム101の
ギヤ部122と帯電ローラ加圧ON/OFF部材125
先端の突起126の噛み合いにより、帯電ローラ加圧O
N/OFF部材125は図5(b)に示すように感光ド
ラム101の回転方向(矢印A方向)に対して帯電ロー
ラ102の下流側に矢印A”方向に回転する。すると、
加圧バネ支持部材127は帯電ローラ加圧ON/OFF
部材125のカム128により加圧ON位置に制御さ
れ、帯電ローラ102の感光ドラム101への当接総圧
は1.0kgfに加圧される。On the other hand, when the photosensitive drum 101 is driven to rotate in the direction of arrow A during image formation or the like, the gear portion 122 of the photosensitive drum 101 and the charging roller pressing ON / OFF member 125
Due to the engagement of the protrusion 126 at the tip, the charging roller pressure O
As shown in FIG. 5B, the N / OFF member 125 rotates in the direction of the arrow A ″ downstream of the charging roller 102 with respect to the rotation direction of the photosensitive drum 101 (the direction of the arrow A).
The pressure spring support member 127 is a charging roller pressure ON / OFF.
The pressure is turned on by the cam 128 of the member 125, and the total contact pressure of the charging roller 102 against the photosensitive drum 101 is increased to 1.0 kgf.
【0057】又、画像形成終了時等の感光ドラム101
の回転停止時には、画像形成装置は感光ドラム101を
所定量だけ逆回転させ、該感光ドラム101のギヤ部1
22と帯電ローラ加圧ON/OFF部材125先端の突
起126の噛み合いにより、帯電ローラ加圧ON/OF
F部材125を感光ドラム101の回転方向(矢印A方
向)に対して上流側に回転させてホームポジションに戻
し、帯電ローラ102が感光ドラム101に対して加圧
OFFされ、当接総圧は0.3kgf以下で当接してい
る状態を作り出す。The photosensitive drum 101 at the end of image formation or the like
When the rotation of the photosensitive drum 101 is stopped, the image forming apparatus reversely rotates the photosensitive drum 101 by a predetermined amount, and the gear unit 1 of the photosensitive drum 101 is rotated.
22 and the charging roller pressing ON / OFF member 125 engage with the projection 126 at the tip thereof, so that the charging roller pressing ON / OFF
The F member 125 is rotated to the upstream side with respect to the rotation direction of the photosensitive drum 101 (direction of arrow A) to return to the home position, the charging roller 102 is pressed off the photosensitive drum 101, and the total contact pressure is zero. A state of contact at 3 kgf or less is created.
【0058】以上の構成により、帯電処理が必要となる
感光ドラム101の回転時以外は帯電ローラ102が感
光ドラム101に当接放置の影響が出ない程度の極軽圧
で当接するため、放置に起因する帯電ローラ周期のハー
フトーンヨコスジ画像の発生を防ぐことができる。With the above configuration, the charging roller 102 contacts the photosensitive drum 101 with an extremely light pressure that does not affect the contacting and leaving of the photosensitive drum 101 except when the photosensitive drum 101 needs to be charged. It is possible to prevent the occurrence of the halftone horizontal stripe image of the charging roller cycle due to the occurrence.
【0059】又、帯電ローラ102の当接・離間を行わ
ない従来の構成に対して追加部材としては感光ドラム1
01のギヤ部122と帯電ローラ加圧ON/OFF部材
125及び加圧バネ支持部材127のみとなるため、帯
電ローラの当接・離間駆動装置を別途設けるのに比べて
非常に安価で簡易な構成とすることができ、斯かる構成
のプロセスカートリッジ110ヘの導入も容易である。In addition to the conventional structure in which the contact and separation of the charging roller 102 are not performed, the photosensitive drum 1
01, the charging roller 122, the charging roller pressing ON / OFF member 125, and the pressing spring support member 127. Therefore, the configuration is very inexpensive and simple as compared with a separate device for driving the contact and separation of the charging roller. The introduction into the process cartridge 110 having such a configuration is also easy.
【0060】<実施の形態3>次に、本発明の実施の形
態3について説明する。<Third Embodiment> Next, a third embodiment of the present invention will be described.
【0061】図6は本実施の形態に係るレーザプリンタ
の帯電ローラ部分の拡大図である。尚、本実施の形態に
係るレーザプリンタの画像形成プロセスは前記実施の形
態1と同様であるため、これについての再度の説明は省
略する。FIG. 6 is an enlarged view of the charging roller portion of the laser printer according to the present embodiment. Note that the image forming process of the laser printer according to the present embodiment is the same as that of the first embodiment, and the description thereof will not be repeated.
【0062】前記実施の形態2が帯電ローラ102の加
圧OFF動作を感光ドラム101の逆回転駆動により行
う構成であったのに対し、本実施の形態では感光ドラム
101の回転停止と共に自動的に加圧OFFとなる機構
を設けている。In the second embodiment, the operation of turning off the pressure of the charging roller 102 is performed by the reverse rotation of the photosensitive drum 101, whereas in the present embodiment, the rotation of the photosensitive drum 101 is automatically stopped when the rotation of the photosensitive drum 101 is stopped. A mechanism for turning off the pressure is provided.
【0063】帯電ローラ102は、実施の形態1と同様
に金属製の軸102aとスポンジ材から成る基層102
b及び表面高抵抗層102cから成り、帯電ローラガイ
ド134により感光ドラム101の法線方向に移動可能
に支持されている。そして、この帯電ローラ102の近
傍には、ギヤ軸ガイド133により感光ドラム101の
接線方向に移動可能に支持された遊星ギヤ130と、回
転可能に支持された固定軸132が配置されており、遊
星ギヤ130の軸130aと帯電ローラ102の軸10
2a及び固定軸132は弾性ベルト131の張力により
互いに内側に引き寄せられるとともに、軸130a,1
02a,132と弾性ベルト131内側との摩擦により
回転駆動力が伝達されるよう構成されている。本実施の
形態では、帯電ローラ102の軸102a及び遊星ギヤ
130の軸130aの外径はφ6mmで等しく、帯電ロ
ーラ102の外径はφ14mm、遊星ギヤ130の外径
はφ10mmに設定されている。As in the first embodiment, the charging roller 102 has a metal shaft 102a and a base layer 102 made of a sponge material.
b and the surface high resistance layer 102c, and is supported by the charging roller guide 134 so as to be movable in the normal direction of the photosensitive drum 101. In the vicinity of the charging roller 102, a planetary gear 130 supported by a gear shaft guide 133 movably in a tangential direction of the photosensitive drum 101 and a fixed shaft 132 rotatably supported are arranged. The shaft 130a of the gear 130 and the shaft 10 of the charging roller 102
2a and the fixed shaft 132 are pulled inward by the tension of the elastic belt 131, and the shafts 130a, 1
The rotation driving force is transmitted by friction between the elastic belts 02a and 132 and the inside of the elastic belt 131. In the present embodiment, the outer diameter of the shaft 102a of the charging roller 102 and the outer diameter of the shaft 130a of the planetary gear 130 are equal to 6 mm, the outer diameter of the charging roller 102 is set to 14 mm, and the outer diameter of the planetary gear 130 is set to 10 mm.
【0064】次に、本発明の特徴である遊星ギヤ130
と弾性ベルト131による感光ドラム101の回転駆動
に連動した帯電ローラ102の加圧ON/OFF動作を
図7に基づいて説明する。Next, the planetary gear 130 which is a feature of the present invention is described.
The pressurizing ON / OFF operation of the charging roller 102 in conjunction with the rotation of the photosensitive drum 101 by the elastic belt 131 will be described with reference to FIG.
【0065】非画像形成時等の感光ドラム101の回転
停止時には、遊星ギヤ130は図7(a)に示すように
弾性ベルト131の張力により感光ドラム101の回転
方向(矢印A方向)に対してギヤ軸ガイド133の上流
側(帯電ローラ102に近い側)に寄せられている状態
にある。このとき、弾性ベルト131の張力は緩んでお
り、帯電ローラ102を感光ドラム101に押し付ける
感光ドラム101の法線方向の力が弱まり、帯電ローラ
102の感光ドラム101への当接総圧は0.3kgf
以下になっている。When the rotation of the photosensitive drum 101 is stopped during non-image formation or the like, the planetary gear 130 is moved with respect to the rotation direction (the direction of arrow A) of the photosensitive drum 101 by the tension of the elastic belt 131 as shown in FIG. It is in a state of being moved to the upstream side (the side close to the charging roller 102) of the gear shaft guide 133. At this time, the tension of the elastic belt 131 is loose, the force in the normal direction of the photosensitive drum 101 for pressing the charging roller 102 against the photosensitive drum 101 is weakened, and the total contact pressure of the charging roller 102 with the photosensitive drum 101 is reduced to 0.1. 3kgf
It is as follows.
【0066】一方、画像形成時等に感光ドラム101が
矢印A方向に回転駆動されると、図7(a)に示すよう
に帯電ローラ102は感光ドラム101の表面から駆動
を受けて矢印A”’方向に従動回転し、遊星ギヤ130
は感光ドラム101のギヤ部122との噛み合いにより
A””方向に回転する。このとき、帯電ローラ102の
表面速度と遊星ギヤ130の表面速度はほぼ同じである
が、両者の外径が違うためにそれぞれの回転数は異な
り、この結果、外径の等しいそれぞれの軸102a,1
30aの表面速度は、帯電ローラ102の軸102aよ
り遊星ギヤ130の軸130aの方が大きくなる。On the other hand, when the photosensitive drum 101 is driven to rotate in the direction of arrow A during image formation or the like, the charging roller 102 receives drive from the surface of the photosensitive drum 101 as shown in FIG. The planetary gear 130
Rotates in the A ″ ″ direction due to engagement with the gear portion 122 of the photosensitive drum 101. At this time, the surface speed of the charging roller 102 and the surface speed of the planetary gear 130 are substantially the same, but since their outer diameters are different, their respective rotational speeds are different. As a result, the shafts 102a, 102e, 1
The surface speed 30a of the shaft 130a of the planetary gear 130 is larger than that of the shaft 102a of the charging roller 102.
【0067】しかし、弾性ベルト131との摩擦により
軸102a,130aの回転駆動は伝達されているた
め、遊星ギヤ130の軸130aは、回転数の低い帯電
ローラ102の軸102aの影響を受けて回転方向
A””と逆方向に力を受ける。このため、遊星ギヤ13
0は回転しにくくなり、感光ドラム101の回転に引き
ずられる形で感光ドラム101の回転方向(矢印A方
向)に対してギヤ軸ガイド133の下流側(帯電ローラ
102から遠い側)に寄せられる。これにより、弾性ベ
ルト131が張られ、その張力により帯電ローラ102
は帯電ローラガイド134に沿って感光ドラム101の
法線方向の力を受け、感光ドラム101に加圧される。
このとき、帯電ローラ102の感光ドラム101への当
接総圧が1.0kgfになるよう、弾性ベルト131の
弾性率、遊星ギヤ130の移動可能量等が調整されてい
る。However, since the rotational drive of the shafts 102a and 130a is transmitted by friction with the elastic belt 131, the shaft 130a of the planetary gear 130 rotates under the influence of the shaft 102a of the charging roller 102 having a low rotational speed. The force is applied in the direction opposite to the direction A "". Therefore, the planetary gear 13
0 is hard to rotate, and is moved to the downstream side (far side from the charging roller 102) of the gear shaft guide 133 with respect to the rotation direction of the photosensitive drum 101 (direction of arrow A) in a form dragged by the rotation of the photosensitive drum 101. As a result, the elastic belt 131 is stretched, and the tension is applied to the charging belt 102.
Receives a force in the normal direction of the photosensitive drum 101 along the charging roller guide 134 and is pressed against the photosensitive drum 101.
At this time, the elasticity of the elastic belt 131, the movable amount of the planetary gear 130, and the like are adjusted such that the total pressure of the charging roller 102 abutting on the photosensitive drum 101 becomes 1.0 kgf.
【0068】その後、画像形成終了時等に感光ドラム1
01が回転停止すると、遊星ギヤ130は再び図7
(a)に示すように弾性ベルト131の張力により感光
ドラム101の回転方向(矢印A方向)に対してギヤ軸
ガイド133の上流側(帯電ローラ102に近い側)に
寄せられ、この結果、帯電ローラ102を感光ドラム1
01に押し付ける感光ドラム101の法線方向の力も弱
まり、帯電ローラ102の感光ドラム101への加圧が
自動的に解除される。Thereafter, at the end of image formation or the like, the photosensitive drum 1
When the rotation of the planetary gear 01 stops, the planetary gear 130 again
As shown in (a), the elastic belt 131 moves the photosensitive drum 101 toward the upstream side (the side closer to the charging roller 102) of the gear shaft guide 133 with respect to the rotation direction (the direction of the arrow A) of the photosensitive drum 101. Roller 102 to photosensitive drum 1
The force applied to the photosensitive drum 101 in the normal direction of the photosensitive drum 101 is also weakened, and the pressing of the charging roller 102 on the photosensitive drum 101 is automatically released.
【0069】以上の構成により、帯電処理が必要となる
感光ドラム101の回転時以外は帯電ローラ102が感
光ドラム101に当接放置の影響が出ない程度の極軽圧
で当接することとなるため、前記実施の形態2と同様に
放置に起因する帯電ローラ周期のハーフトーンヨコスジ
画像の発生を防ぐことができる。With the above configuration, the charging roller 102 comes into contact with the photosensitive drum 101 with an extremely light pressure that does not have an effect of being left in contact with the photosensitive drum 101 except when the photosensitive drum 101 needs to be charged. In the same manner as in the second embodiment, it is possible to prevent the occurrence of a halftone horizontal stripe image of the charging roller cycle due to leaving.
【0070】又、同様に帯電ローラの当接・離間駆動装
置を別途設ける必要がなく、実施の形態2のように帯電
ローラ102の加圧解除のために感光ドラム101の逆
回転駆動の必要がないため、感光ドラムの駆動系統の簡
易化等のために感光ドラムの逆回転駆動機構を省略した
ような画像形成装置に有効である。Similarly, it is not necessary to separately provide a contact / separation drive device for the charging roller, and it is necessary to reversely drive the photosensitive drum 101 to release the pressure of the charging roller 102 as in the second embodiment. Therefore, the present invention is effective for an image forming apparatus in which the reverse rotation driving mechanism of the photosensitive drum is omitted for simplifying the drive system of the photosensitive drum.
【0071】<実施の形態4>次に、本発明の実施の形
態4について説明する。<Fourth Embodiment> Next, a fourth embodiment of the present invention will be described.
【0072】本実施の形態に係る帯電装置の構成は前記
実施の形態1のそれと同様であるため、以下、図2及び
図3に基づいて説明する。Since the configuration of the charging device according to the present embodiment is the same as that of the first embodiment, the following description will be made with reference to FIGS. 2 and 3.
【0073】帯電ローラ当接・離間部材120による感
光ドラム101の回転駆動に連動した帯電ローラ102
の当接・離間動作について説明する。先ず、感光ドラム
カートリッジ110の装着時には、帯電ローラ当接・離
間部材120は図3(a)に示すように帯電ローラ10
2の加圧方向と並行に配置(ホームポジション)されて
おり、このとき帯電ローラ102は加圧方向と逆方向に
押されるため、該帯電ローラ102は感光ドラム101
に対して約0.5mmの間隔で離間している。その後、
イニシャルシーケンス又は画像形成時等において感光ド
ラム101が矢印A方向に回転駆動されると、該感光ド
ラム101のギヤ部122と帯電ローラ当接・離間部材
120先端の突起121の噛み合いにより、帯電ローラ
当接・離間部材120は図3(a)に示すように帯電ロ
ーラ102の軸102aを中心として矢印A’方向に回
転する。すると、帯電ローラ102の軸102aを支え
ていた帯電ローラ当接・離間部材120の影響がなくな
り、帯電ローラ102は加圧バネ124により感光ドラ
ム101に対して所定量の加圧力にて加圧当接され、帯
電処理動作に適した状態となる。The charging roller 102 interlocked with the rotation driving of the photosensitive drum 101 by the charging roller contact / separation member 120
Will be described. First, when the photosensitive drum cartridge 110 is mounted, the charging roller contact / separation member 120 is moved to the charging roller 10 as shown in FIG.
2, the charging roller 102 is pressed in a direction opposite to the pressing direction, so that the charging roller 102 is
Are separated from each other at an interval of about 0.5 mm. afterwards,
When the photosensitive drum 101 is driven to rotate in the direction of arrow A during an initial sequence, image formation, or the like, the gear portion 122 of the photosensitive drum 101 engages with the projection 121 at the tip of the charging roller contacting / separating member 120 to cause the charging roller contact. The contact / separation member 120 rotates in the direction of arrow A 'about the axis 102a of the charging roller 102 as shown in FIG. Then, the effect of the charging roller contact / separation member 120 supporting the shaft 102a of the charging roller 102 is eliminated, and the charging roller 102 is pressed against the photosensitive drum 101 by the pressing spring 124 with a predetermined amount of pressing force. And is in a state suitable for the charging operation.
【0074】画像形成動作終了後、画像形成装置は時間
カウント手段により画像形成後の経過時間をカウントし
始め、ユーザーによるプリント要求が一定時間以上(本
実施の形態では1 時間に設定)行われないと、感光ドラ
ム101を図3(c)の矢印B方向に所定量だけ逆回転
させ、感光ドラム101のギヤ部122と帯電ローラ当
接・離間部材120先端の突起121の噛み合いによ
り、帯電ローラ当接・離間部材120を図示矢印B’方
向に回転させてホームポジションに戻し、帯電ローラ1
02が感光ドラム101に対して約0.5mm離間した
状態を作り出す。After the end of the image forming operation, the image forming apparatus starts counting the elapsed time after the image formation by the time counting means, and the print request by the user is not made for a certain time or more (set to one hour in the present embodiment). Then, the photosensitive drum 101 is reversely rotated by a predetermined amount in the direction of arrow B in FIG. 3C, and the gear portion 122 of the photosensitive drum 101 and the protrusion 121 at the tip of the charging roller contacting / separating member 120 engage with the charging roller. The contact / separation member 120 is rotated in the direction of arrow B ′ in the figure to return to the home position,
02 creates a state separated from the photosensitive drum 101 by about 0.5 mm.
【0075】又、本実施の形態では、画像形成動作終了
後、帯電ローラ102を感光ドラム101に対して離間
状態にする動作タイミングは、画像形成動作終了後一定
時間経過後以外に、画像形成装置の電源OFF時(画像
形成装置本体の電源スイッチがOFFされると、画像形
成装置は感光ドラム101を一定回転進回転させた後、
画像形成装置全休の電源をOFFする)、ジャム発生時
(ジャムが発生すると、画像形成装置は感光ドラム10
1を一定回転逆回転させた後、ジャム処理待機状態に移
行する)、感光ドラムカートリッジ110の取り出し時
(ユーザーが感光ドラムカートリッジ110を取り出そ
うとして感光ドラムカートリッジ交換ドアアクセススイ
ッチを押すと、画像形成装置は感光ドラム101を一定
回転逆回転させた後、感光ドラムカートリッジ交換ドア
を開閉可能にする)、ユーザーによる指示発生時(画像
形成装置の操作パネルには、ユーザーが任意のタイミン
グで帯電ローラ102の離間を行うためのスイッチが設
けられている)等が設定されている。In the present embodiment, after the image forming operation is completed, the operation timing for bringing the charging roller 102 into a state of being separated from the photosensitive drum 101 is not limited to a time after a predetermined time has elapsed since the image forming operation is completed. (When the power switch of the image forming apparatus main body is turned off, the image forming apparatus rotates the photosensitive drum 101 by a predetermined rotational speed,
When the power supply of the image forming apparatus is completely turned off, when a jam occurs (when a jam occurs, the image forming apparatus
1 is rotated counterclockwise after a predetermined rotation, the process proceeds to a jam processing standby state). When the photosensitive drum cartridge 110 is removed (when the user presses the photosensitive drum cartridge replacement door access switch to remove the photosensitive drum cartridge 110, image formation is performed). The apparatus rotates the photosensitive drum 101 by a predetermined number of times and then reversely rotates the photosensitive drum cartridge, and then opens and closes a photosensitive drum cartridge replacement door. When an instruction is issued by a user (the operation panel of the image forming apparatus displays the charging roller And a switch for performing the separation are provided).
【0076】以上の構成により、帯電処理が必要となる
感光ドラム101の回転時には、自動的に帯電ローラ1
02は帯電処理動作に適した状態となり、プリント動作
後一定時間経過後や電源OFF時等、帯電ローラ102
が感光ドラム101に長時間加圧当接放置される場合等
には帯電ローラ102が感光ドラム101に当接しない
構成となるため、加圧当接放置起因による帯電ローラ周
期のハーフトーンヨコスジ画像の発生を防ぐことができ
る。With the above configuration, when the photosensitive drum 101 needs to be charged, the charging roller 1 is automatically rotated.
No. 02 is in a state suitable for the charging process operation.
In a case where the charging roller 102 is left in pressure contact with the photosensitive drum 101 for a long time, for example, the charging roller 102 does not contact the photosensitive drum 101. Can be prevented.
【0077】又、帯電ローラ102の当接・離間を行わ
ない従来の構成に対して追加部材としては感光ドラム1
01のギヤ部122と帯電ローラ当接・離間部材120
のみとなるため、帯電ローラの当接・離間駆動装置を別
途設けるのに比べて非常に安価で簡易な構成とすること
ができ、斯かる構成のプロセスカートリッジ110ヘの
導入も容易である。Further, as an additional member, a photosensitive drum 1
01 and the charging roller contact / separation member 120
Therefore, the configuration can be made very inexpensive and simple as compared with the case where a contact / separation drive device for the charging roller is separately provided, and introduction into the process cartridge 110 having such a configuration is also easy.
【0078】<実施の形態5>次に、本発明の実施の形
態5について説明する。<Fifth Embodiment> Next, a fifth embodiment of the present invention will be described.
【0079】本実施の形態に係る帯電装置の構成は前記
実施の形態2のそれと同様であるため、以下、図4及び
図5に基づいて説明する。The configuration of the charging device according to the present embodiment is the same as that of the charging device according to the second embodiment, and will be described below with reference to FIGS.
【0080】本発明の特徴である帯電ローラ加圧ON/
OFF部材125による感光ドラム101の回転駆動に
連動した帯電ローラ102の加圧ON/OFF動作を図
5に基づいて説明する。The charging roller pressurization ON /
The pressurization ON / OFF operation of the charging roller 102 in conjunction with the rotation driving of the photosensitive drum 101 by the OFF member 125 will be described with reference to FIG.
【0081】先ず、感光ドラムカートリッジ101の装
着時には、帯電ローラ加圧ON/OFF部材125は図
5(a)に示すように感光ドラム101回転方向(矢印
A方向)に対して帯電ローラ102の上流側に配置(ホ
ームポジション)されており、このとき加圧バネ支持部
材127は帯電ローラ加圧ON/OFF部材125のカ
ム128によって加圧OFF位置に制御されており、帯
電ローラ102の感光ドラム101への当接総圧は0.
3kgf以下になっている。First, when the photosensitive drum cartridge 101 is mounted, the charging roller pressurizing ON / OFF member 125 moves upstream of the charging roller 102 with respect to the rotating direction of the photosensitive drum 101 (direction of arrow A) as shown in FIG. Side (home position), the pressure spring support member 127 is controlled to the pressure OFF position by the cam 128 of the charging roller pressure ON / OFF member 125, and the photosensitive drum 101 of the charging roller 102. The total contact pressure is 0.
It is less than 3 kgf.
【0082】その後、イニシャルシーケンス又は画像形
成時等に感光ドラム101が矢印A方向に回転駆動され
ると、該感光ドラム101のギヤ部122と帯電ローラ
加圧ON/OFF部材125先端の突起126の噛み合
いにより、帯電ローラ加圧ON/OFF部材125は図
5(a)に示すように感光ドラム101の回転方向(矢
印A方向)に対して帯電ローラ102の下流側にA”方
向に回転する。すると、加圧バネ支持部材127は帯電
ローラ加圧ON/OFF部材125のカム128により
加圧ON位置に制御され、帯電ローラ102の感光ドラ
ム101への当接総圧は1.0kgfに加圧され、帯電
処理動作に適した状態となる。Thereafter, when the photosensitive drum 101 is driven to rotate in the direction of arrow A during an initial sequence or image formation, the gear portion 122 of the photosensitive drum 101 and the protrusion 126 at the tip of the charging roller pressing ON / OFF member 125 are formed. Due to the engagement, the charging roller pressing ON / OFF member 125 rotates in the A ″ direction downstream of the charging roller 102 with respect to the rotation direction of the photosensitive drum 101 (the direction of arrow A) as shown in FIG. Then, the pressing spring supporting member 127 is controlled to the pressing ON position by the cam 128 of the charging roller pressing ON / OFF member 125, and the total contact pressure of the charging roller 102 with the photosensitive drum 101 is increased to 1.0 kgf. As a result, the state becomes suitable for the charging operation.
【0083】画像形成動作終了後、画像形成装置は時間
カウント手段により画像形成後の経過時間をカウントし
始め、ユーザーによるプリント要求が一定時間以上(本
実施の形態では1時間に設定)行われないと、画像形成
装置は定着装置の温調制御を切る等のスリープモード
(消費電力セーブモード)に入り、更に一定時間後(本
実施の形態では初期設定として15分に設定されてい
る)後、冷却ファンを停止させるとともに、感光ドラム
101を所定量逆回転させ、感光ドラム101のギヤ部
122と帯電ローラ加圧ON/OFF部材125先端の
突起126の噛み合いにより、帯電ローラ加圧ON/O
FF部材125を感光ドラム101の回転方向(矢印A
方向)に対して上流側に回転させてホームポジションに
戻し、この結果、帯電ローラ102が感光ドラム101
に対して加圧OFFされ、当接総圧は0.3kgf以下
で当接している状態を作り出す。After the end of the image forming operation, the image forming apparatus starts counting the elapsed time after the image formation by the time counting means, and the print request from the user is not made for a certain time or more (set to one hour in the present embodiment). Then, the image forming apparatus enters a sleep mode (power consumption saving mode) such as turning off the temperature control of the fixing device, and after a certain period of time (15 minutes as an initial setting in the present embodiment). The cooling fan is stopped, the photosensitive drum 101 is rotated in the reverse direction by a predetermined amount, and the gear portion 122 of the photosensitive drum 101 engages with the protrusion 126 at the tip of the charging roller pressing ON / OFF member 125 to turn on / off the charging roller.
The FF member 125 is moved in the rotation direction of the photosensitive drum 101 (arrow A).
Direction) to return to the home position, and as a result, the charging roller 102
Is turned off, and a contact state is created with a total contact pressure of 0.3 kgf or less.
【0084】又、本実施の形態においても、実施の形態
4と同様に、帯電ローラ102を感光ドラム101に対
して加圧OFF状態にする動作タイミングは他に、画像
形成装置の電源OFF時、ジャム発生時、感光ドラムカ
ートリッジ110の取り出し時、ユーザーによる指示発
生時等が設定されている。Also, in the present embodiment, similarly to the fourth embodiment, the operation timing for turning off the charging roller 102 with respect to the photosensitive drum 101 under pressure is different from the operation timing when the power of the image forming apparatus is turned off. When a jam occurs, when the photosensitive drum cartridge 110 is removed, when an instruction is issued by a user, and the like are set.
【0085】更に、本実施の形態に係る画像形成装置で
は、電源OFF後に冷却ファンが一定時間回転された
後、画像形成装置全休の電源がOFFされる設定となっ
ており、この制御と連動させて電源OFF後一定時間経
過後冷却ファン停止時等に帯電ローラ102の加圧OF
F動作を行い、制御プログラムの簡素化を行っても良
い。逆に、スリープモード移行時に連動して帯電ローラ
102の加圧OFF動作を行うのも同様である。Further, in the image forming apparatus according to the present embodiment, after the cooling fan is rotated for a certain period of time after the power is turned off, the power is turned off when the image forming apparatus is completely off. Pressurizing OF of the charging roller 102 when a cooling fan stops after a certain time has elapsed
The F operation may be performed to simplify the control program. Conversely, the same applies to the operation of pressing off the charging roller 102 in conjunction with the transition to the sleep mode.
【0086】以上の構成により、帯電処理が必要となる
感光ドラム101の回転時には自動的に帯電ローラ10
2は帯電処理動作に適した状態となり、スリープモード
移行時や電源OFF時等、帯電ローラ102が感光ドラ
ム101に当接放置の影響が出ない程度の極軽圧で当接
している構成となるため、加圧当接放置に起因する帯電
ローラ周期のハーフトーンヨコスジ画像の発生を防ぐこ
とができる。With the above configuration, when the photosensitive drum 101 needs to be charged, the charging roller 10 is automatically rotated.
Reference numeral 2 denotes a state suitable for the charging operation, in which the charging roller 102 is in contact with the photosensitive drum 101 with an extremely light pressure such that the contact roller 102 does not have an effect of being left in contact with the photosensitive drum 101, such as when shifting to a sleep mode or when the power is turned off. For this reason, it is possible to prevent the occurrence of a halftone horizontal stripe image of the charging roller cycle due to the pressure contact and standing.
【0087】又、帯電ローラ102の当接・離間を行わ
ない従来の構成に対して追加部材としては感光ドラム1
01のギヤ部122と帯電ローラ加圧ON/OFF部材
125及び加圧バネ支持部材127のみとなるため、帯
電ローラの当接・離間駆動装置を別途設けるのに比べて
非常に安価で簡易な構成とすることができ、斯かる構成
のプロセスカートリッジ110ヘの導入も容易である。In addition to the conventional structure in which the contact and separation of the charging roller 102 are not performed, the photosensitive drum 1
01, the charging roller 122, the charging roller pressing ON / OFF member 125, and the pressing spring support member 127. Therefore, the configuration is very inexpensive and simple as compared with a separate device for driving the contact and separation of the charging roller. The introduction into the process cartridge 110 having such a configuration is also easy.
【0088】[0088]
【発明の効果】以上の説明で明らかなように、本発明に
よれば、帯電ローラの当接・離間駆動装置を別途設ける
ことなく、加圧当接放置に起因する帯電ローラ周期のハ
ーフトーンヨコスジ画像の発生を安価な構成によって防
ぐことができるという効果が得られる。As is apparent from the above description, according to the present invention, the charging roller contact / separation drive device is not separately provided, and the halftone horizontal rotation of the charging roller cycle caused by the pressure contact is left. The effect is obtained that the generation of a streak image can be prevented by an inexpensive configuration.
【図1】本発明に係る画像形成装置であるレーザプリン
タの概略断面図である。FIG. 1 is a schematic sectional view of a laser printer which is an image forming apparatus according to the present invention.
【図2】本発明の実施の形態1,4に係るレーザプリン
タの帯電ローラ部分の拡大図である。FIG. 2 is an enlarged view of a charging roller portion of the laser printer according to Embodiments 1 and 4 of the present invention.
【図3】本発明の実施の形態1,4に係るレーザプリン
タの帯電ローラの当接・離間動作を説明する図である。FIG. 3 is a diagram illustrating contact / separation operations of charging rollers of the laser printer according to Embodiments 1 and 4 of the present invention.
【図4】本発明の実施の形態2,5に係るレーザプリン
タの帯電ローラ部分の拡大図である。FIG. 4 is an enlarged view of a charging roller portion of the laser printer according to Embodiments 2 and 5 of the present invention.
【図5】本発明の実施の形態2,5に係るレーザプリン
タの帯電ローラの加圧ON/OFF動作を説明する図で
ある。FIG. 5 is a diagram illustrating a pressure ON / OFF operation of a charging roller of the laser printer according to Embodiments 2 and 5 of the present invention.
【図6】本発明の実施の形態3に係るレーザプリンタの
帯電ローラ部分の拡大図である。FIG. 6 is an enlarged view of a charging roller portion of a laser printer according to Embodiment 3 of the present invention.
【図7】本発明の実施の形態3に係るレーザプリンタの
帯電ローラの加圧ON/OFF動作を説明する図であ
る。FIG. 7 is a diagram illustrating a pressure ON / OFF operation of a charging roller of the laser printer according to Embodiment 3 of the present invention.
【図8】従来の画像形成装置の帯電ローラ部分の拡大図
である。FIG. 8 is an enlarged view of a charging roller portion of a conventional image forming apparatus.
101 感光ドラム(像担持体) 102 帯電ローラ 103 露光手段 104 現像手段 120 帯電ローラ当接・離間部材 121 突起 122 ギヤ部 123 軸受部材 124 加圧バネ 125 帯電ローラ加圧ON/OFF部材 126 突起 127 加圧バネ支持部材 128 カム 129 位置決め部材 130 遊星ギヤ 131 弾性ベルト 132 固定軸 133 ギヤ軸ガイド Reference Signs List 101 photosensitive drum (image carrier) 102 charging roller 103 exposing means 104 developing means 120 charging roller contacting / separating member 121 projection 122 gear portion 123 bearing member 124 pressure spring 125 charging roller pressing ON / OFF member 126 projection 127 Compression spring support member 128 Cam 129 Positioning member 130 Planetary gear 131 Elastic belt 132 Fixed shaft 133 Gear shaft guide
フロントページの続き Fターム(参考) 2H027 DA29 DA32 DA38 DC14 DE07 DE09 EC06 ED02 ED03 EE02 EE05 EF06 EF12 EF16 EF17 EF18 JB20 ZA01 2H071 BA03 BA13 BA15 BA20 BA27 CA05 DA13 DA15 DA31 EA16 2H200 FA16 GA10 GA23 GA34 GA47 HA03 HA29 HB12 HB22 HB31 HB33 HB43 HB46 HB47 JC02 LA03 LA17 LA24 MA03 MB05 PA03 PA10 PA18 PB21 Continued on the front page F-term (reference) 2H027 DA29 DA32 DA38 DC14 DE07 DE09 EC06 ED02 ED03 EE02 EE05 EF06 EF12 EF16 EF17 EF18 JB20 ZA01 2H071 BA03 BA13 BA15 BA20 BA27 CA05 DA13 DA15 DA31 EA16 2H200 FA16 GA10 HA23 GA34 HB33 HB43 HB46 HB47 JC02 LA03 LA17 LA24 MA03 MB05 PA03 PA10 PA18 PB21
Claims (22)
印加することによって像担持体表面を一定電位に帯電処
理する帯電装置において、 前記帯電ローラの像担持体への加圧のON/OFF又は
当接/離間を像担持体の回転駆動に連動して行う機構を
設けたことを特徴とする帯電装置。1. A charging device for charging a surface of an image carrier to a constant potential by applying a voltage to a charging roller in contact with the image carrier, wherein ON / OFF of pressing of the charging roller to the image carrier. Alternatively, the charging device is provided with a mechanism for performing contact / separation in conjunction with rotation driving of the image carrier.
体を回転駆動して前記帯電ローラの離間を行うことを特
徴とする請求項1記載の帯電装置。2. A charging device according to claim 1, wherein said image bearing member is rotated at a predetermined timing to separate said charging roller.
記帯電ローラの像担持体への加圧ON又は当接を行い、
像担持体の回転駆動の逆回転時に帯電ローラの像担持体
への加圧OFF又は離間を行うことを特徴とする請求項
2記載の帯電装置。3. The pressure roller turns on or abuts on the image carrier when the image carrier is rotated forward when the image carrier is rotated.
3. The charging device according to claim 2, wherein the charging roller is turned off or separated from the image carrier when the image carrier is rotated in a reverse direction to the rotation of the image carrier.
ーラの加圧OFF又は離間を行うタイミングを電源OF
F時又は電源OFF時から一定時間後としたことを特徴
とする請求項2又は3記載の帯電装置。4. A power supply OF which rotates the image carrier and turns off or separates the pressure of the charging roller.
The charging device according to claim 2, wherein the charging device is set at a predetermined time after the start of the operation or when the power is turned off.
ーラの加圧OFF又は離間を行うタイミングを画像形成
動作後一定時間後としたことを特徴とする請求項2又は
3記載の帯電装置。5. The charging device according to claim 2, wherein the timing at which the image bearing member is rotationally driven to turn off or separate the charging roller is a predetermined time after the image forming operation. .
ーラの加圧OFF又は離間を行うタイミングをスリープ
モード移行時又はスリープモード移行時から一定時間後
としたことを特徴とする請求項2又は3記載の帯電装
置。6. The apparatus according to claim 2, wherein the timing at which the image bearing member is rotationally driven to turn off or separate the pressure of the charging roller is set to a sleep mode transition or a fixed time after the sleep mode transition. Or the charging device according to 3.
ーラの加圧OFF又は離間を行うタイミングをジャム発
生時又はジャム発生時から一定時間後としたことを特徴
とする請求項2又は3記載の帯電装置。7. The apparatus according to claim 2, wherein the timing at which the image bearing member is rotationally driven to turn off or separate the charging roller is pressurized when a jam occurs or a predetermined time after the jam occurs. The charging device as described in the above.
ーラの加圧OFF又は離間を行うタイミングをユーザー
からの指示発生時としたことを特徴とする請求項2又は
3記載の帯電装置。8. The charging device according to claim 2, wherein the timing for turning off the image bearing member and pressing off or separating the charging roller is performed when an instruction is issued from a user.
ーラの加圧OFF又は離間を行うタイミングを画像形成
装置からの当該帯電装置の取り出し時としたことを特徴
とする請求項2又は3記載の帯電装置。9. The image forming apparatus according to claim 2, wherein the timing at which the charging roller is pressed off or separated by rotating the image bearing member is taken out of the image forming apparatus. The charging device as described in the above.
を印加することによって像担持体表面を一定電位に帯電
処理する帯電装置において、 前記像担持体の回転駆動の正回転時に前記帯電ローラの
前記像担持体への加圧ON又は当接を行い、像担持体の
回転駆動の逆回転時に帯電ローラの像担持体への加圧O
FF又は離間を行う機構を設けたことを特徴とする帯電
装置。10. A charging device for charging a surface of an image carrier to a constant potential by applying a voltage to a charging roller in contact with the image carrier, comprising: Pressing ON or contacting the image bearing member, and pressing the charging roller against the image bearing member at the time of reverse rotation of the rotation of the image bearing member.
A charging device provided with a mechanism for performing FF or separation.
置と、少なくとも像担持体を一体的に収容し、画像形成
装置本体に対して着脱自在に構成されることを特徴とす
るプロセスカートリッジ。11. A process characterized by accommodating the charging device according to claim 1 and at least an image carrier integrally and detachably mounted on an image forming apparatus main body. cartridge.
とも像担持体を一体的に収容し、画像形成装置本体に対
して着脱自在に構成されることを特徴とするプロセスカ
ートリッジ。12. A process cartridge accommodating the charging device according to claim 10 and at least an image carrier, and being detachably attached to an image forming apparatus main body.
電ローラに電圧を印加することによって像担持体表面を
一定電位に帯電処理する帯電装置と、帯電処理された像
担持体に静電潜像を記録する露光手段と、像担持体上の
静電潜像を現像剤により現像処理する現像手段を有する
画像形成装置において、 前記帯電ローラの像担持体への加圧のON/OFF又は
当接/離間を像担持体の回転駆動に連動して行う機構を
設けたことを特徴とする画像形成装置。13. A charging device for charging a surface of an image bearing member to a constant potential by applying a voltage to an image bearing member and a charging roller in contact with the image bearing member. In an image forming apparatus having an exposure unit that records an electrostatic latent image and a developing unit that develops an electrostatic latent image on an image carrier with a developer, ON / OFF of pressing of the charging roller to the image carrier is performed. Alternatively, an image forming apparatus provided with a mechanism for performing contact / separation in conjunction with rotation driving of the image carrier.
電ローラに電圧を印加することによって像担持体表面を
一定電位に帯電処理する帯電装置と、帯電処理された像
担持体に静電潜像を記録する露光手段と、像担持体上の
静電潜像を現像剤により現像処理する現像手段を有する
画像形成装置において、 前記像担持体の回転駆動の正回転時に前記帯電ローラの
前記像担持体への加圧ON又は当接を行い、像担持体の
回転駆動の逆回転時に帯電ローラの像担持体への加圧O
FF又は離間を行う機構を設けたことを特徴とする画像
形成装置。14. A charging device for charging a surface of an image carrier to a constant potential by applying a voltage to an image carrier, a charging roller in contact with the image carrier, and a statically charged image carrier. In an image forming apparatus having an exposure unit that records an electrostatic latent image and a developing unit that develops an electrostatic latent image on an image carrier with a developer, the image forming apparatus includes a charging roller that rotates when the image carrier is rotated forward. Pressing ON or contacting the image bearing member, and pressing the charging roller against the image bearing member at the time of reverse rotation of the rotation of the image bearing member.
An image forming apparatus provided with a mechanism for performing FF or separation.
電ローラに電圧を印加することによって像担持体表面を
一定電位に帯電処理する帯電装置と、帯電処理された像
担持体に静電潜像を記録する露光手段と、像担持体上の
静電潜像を現像剤により現像処理する現像手段を有する
画像形成装置において、 前記帯電ローラ前記像担持体への加圧のON/OFF又
は当接/離間を像担持体の回転駆動と連動して行う機構
を設け、予め決められたタイミングで像担持体を回転駆
動して帯電ローラの加圧OFF又は離間を行うことを特
徴とする画像形成装置。15. A charging device for charging a surface of an image carrier to a constant potential by applying a voltage to an image carrier, a charging roller in contact with the image carrier, and a statically charged image carrier. An image forming apparatus comprising: an exposure unit for recording an electrostatic latent image; and a developing unit for developing an electrostatic latent image on an image carrier with a developer. Alternatively, a mechanism for performing contact / separation in conjunction with rotation driving of the image carrier is provided, and the image carrier is rotationally driven at a predetermined timing to turn off or separate the pressure of the charging roller. Image forming device.
前記帯電ローラの像担持体への加圧ON又は当接を行
い、像担持体の回転駆動の逆回転時に帯電ローラの像担
持体への加圧OFF又は離間を行うことを特徴とする請
求項15記載の画像形成装置。16. The image forming apparatus according to claim 1, wherein the charging roller is turned on or in contact with the image carrier when the image carrier is rotated forward, and the charging roller is rotated when the image carrier is rotated in reverse. The image forming apparatus according to claim 15, wherein pressurization is turned off or separated.
ローラの加圧OFF又は離間を行うタイミングを電源O
FF時又は電源OFF時から一定時間後としたことを特
徴とする請求項15又は16記載の画像形成装置。17. A timing for turning off the image bearing member and pressing off or separating the charging roller by a power supply O
The image forming apparatus according to claim 15, wherein the predetermined time has elapsed after the FF or when the power was turned off.
ローラの加圧OFF又は離間を行うタイミングを画像形
成動作後一定時間後としたことを特徴とする請求項15
又は16記載の画像形成装置。18. The image forming apparatus according to claim 15, wherein the timing at which the image bearing member is rotationally driven to turn off or separate the pressure of the charging roller is a predetermined time after the image forming operation.
Or the image forming apparatus according to 16.
ローラの加圧OFF又は離間を行うタイミングをスリー
プモード移行時又はスリープモード移行時から一定時間
後としたことを特徴とする請求項15又は16記載の画
像形成装置。19. The apparatus according to claim 15, wherein the timing at which the charging roller is pressed off or separated by rotating the image carrier is shifted to a sleep mode or a predetermined time after the shift to the sleep mode. Or the image forming apparatus according to 16.
ローラ状の加圧OFF又は離間を行うタイミングをジャ
ム発生時又はジャム発生時から一定時間後としたことを
特徴とする請求項15又は16記載の画像形成装置。20. The apparatus according to claim 15, wherein the timing at which the image carrier is rotationally driven to turn off or separate the pressure of the charging roller is at the time of occurrence of a jam or a predetermined time after the occurrence of the jam. 17. The image forming apparatus according to item 16.
ローラの加圧OFF又は離間を行うタイミングをユーザ
ーからの指示発生時としたことを特徴とする請求項15
又は16記載の画像形成装置。21. The timing of turning off the image bearing member and pressing off or separating the charging roller by rotating the image carrier when an instruction from a user occurs.
Or the image forming apparatus according to 16.
ローラの加圧OFF又は離間を行うタイミングを当該画
像形成装置からの前記帯電装置の取り出し時としたこと
を特徴とする請求項15又は16記載の画像形成装置。22. The image forming apparatus according to claim 15, wherein the timing at which the image bearing member is rotationally driven to turn off or separate the pressure of the charging roller is when the charging device is taken out of the image forming apparatus. 17. The image forming apparatus according to item 16.
Priority Applications (1)
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JP2001119255A JP2002311690A (en) | 2001-04-18 | 2001-04-18 | Electrifier, process cartridge and image forming device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001119255A JP2002311690A (en) | 2001-04-18 | 2001-04-18 | Electrifier, process cartridge and image forming device |
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Publication Number | Publication Date |
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JP2002311690A true JP2002311690A (en) | 2002-10-23 |
Family
ID=18969507
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JP2008224876A (en) * | 2007-03-09 | 2008-09-25 | Fuji Xerox Co Ltd | Image forming apparatus |
US7865115B2 (en) | 2006-04-19 | 2011-01-04 | Canon Kabushiki Kaisha | Process cartridge, electrophotographic image forming apparatus, method of manufacturing a process cartridge, and method of remanufacturing a process cartridge |
JP2013037122A (en) * | 2011-08-05 | 2013-02-21 | Canon Inc | Process cartridge |
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US9760059B2 (en) | 2015-01-22 | 2017-09-12 | Canon Kabushiki Kaisha | Photosensitive member unit and image forming apparatus including the same |
US10025217B2 (en) | 2015-02-27 | 2018-07-17 | Canon Kabushiki Kaisha | Cartridge and image forming apparatus |
JP2020181097A (en) * | 2019-04-25 | 2020-11-05 | キヤノン株式会社 | Photoreceptor unit and image forming apparatus |
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2001
- 2001-04-18 JP JP2001119255A patent/JP2002311690A/en not_active Withdrawn
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JP2004280182A (en) * | 2003-03-12 | 2004-10-07 | Fuji Xerox Co Ltd | Power unit |
JP4547860B2 (en) * | 2003-03-12 | 2010-09-22 | 富士ゼロックス株式会社 | Power supply |
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US7865115B2 (en) | 2006-04-19 | 2011-01-04 | Canon Kabushiki Kaisha | Process cartridge, electrophotographic image forming apparatus, method of manufacturing a process cartridge, and method of remanufacturing a process cartridge |
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US10025217B2 (en) | 2015-02-27 | 2018-07-17 | Canon Kabushiki Kaisha | Cartridge and image forming apparatus |
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