JPH07191590A - Cleaning method of photoreceptor and electrophotographic copying machine - Google Patents
Cleaning method of photoreceptor and electrophotographic copying machineInfo
- Publication number
- JPH07191590A JPH07191590A JP5332854A JP33285493A JPH07191590A JP H07191590 A JPH07191590 A JP H07191590A JP 5332854 A JP5332854 A JP 5332854A JP 33285493 A JP33285493 A JP 33285493A JP H07191590 A JPH07191590 A JP H07191590A
- Authority
- JP
- Japan
- Prior art keywords
- transfer
- photoconductor
- cleaning
- charging
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
- Cleaning In Electrography (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、電子写真複写機の感
光体のクリーニング方法、及び電子写真複写機に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning a photoconductor of an electrophotographic copying machine and an electrophotographic copying machine.
【０００２】[0002]
【従来の技術】従来この種の電子写真複写機、及び感光
体のクリーニング方法には、感光体１のクリーニング
方法は転写工程後、感光体１上に静電的に付着したトナ
ーが、まず第１クリーニング部材13によって機械的摺擦
によってほぐされると同時に除電機能を兼用させ、感光
体１上の電荷を除電して第２クリーニング部材14のクリ
ーニング負担を軽減した後、感光体１のクリーニングを
行うものが特開昭56-24382号公報に開示され公知となっ
ている。それは、図８に示すように、感光体１の回転方
向にあって転写手段３の下流側に設けられたクリーニン
グ手段２は感光体１に圧接する第１クリーニング部材13
と、その後方に配置された第２クリーニング部材14との
２つのクリーニング手段を有し、第１クリーニング部材
13は導電性の弾性体ローラが用いられ、接地または静電
潜像の極性とは逆極性の電圧が印加され、第２クリーニ
ング部材14には弾性クリーニングブレードを用いたもの
である。2. Description of the Related Art Conventionally, in a cleaning method of an electrophotographic copying machine and a photoconductor of this kind, the cleaning method of the photoconductor 1 is such that the toner electrostatically adhered to the photoconductor 1 after the transfer process is first. (1) The cleaning member 13 is loosened by mechanical rubbing, and at the same time, also has a charge eliminating function to eliminate the charge on the photoconductor 1 to reduce the cleaning load on the second cleaning member 14, and then the photoconductor 1 is cleaned. Those disclosed in JP-A-56-24382 are publicly known. As shown in FIG. 8, the cleaning means 2 provided on the downstream side of the transfer means 3 in the rotation direction of the photoconductor 1 is in contact with the photoconductor 1 under pressure.
And a second cleaning member 14 disposed behind the first cleaning member.
A conductive elastic roller 13 is used, a voltage having a polarity opposite to that of the ground or the electrostatic latent image is applied, and an elastic cleaning blade is used as the second cleaning member 14.
【０００３】また光照射手段６で感光体１を光除電す
る際、除電光の波長を最後の順番に現像するトナーの色
と略同一色の光を照射して除電して、クリーニング手段
２によってクリーニングを行う感光体１のクリーニング
方法が特開平1-307773号公報に開示され公知となってい
る。それは図９に示すように感光体１上に得られたカラ
ートナー像を紙に転写する転写手段３と、転写手段３に
よってカラートナー像を紙に転写した後、カラートナー
像を熱定着する定着器22と、転写後に感光体１上に残留
したカラートナーを除去するクリーニング手段２と、前
記転写手段３とクリーニング手段２との間に感光体１を
除電する光照射手段６を設けたものである。なお図７，
８において、４は転写チャージャ、５は帯電手段、８は
転写ベルト、９は現像手段をそれぞれ示す。When the photosensitive member 1 is photo-electrified by the light irradiating means 6, the wavelength of the erasing light is irradiating with light of substantially the same color as the color of the toner to be developed in the last order to eliminate the electric charge, and the cleaning means 2 is used. A method for cleaning the photosensitive member 1 for cleaning is disclosed in Japanese Patent Laid-Open No. 307773/1993 and is publicly known. As shown in FIG. 9, the transfer means 3 transfers the color toner image obtained on the photoconductor 1 to the paper, and the transfer means 3 transfers the color toner image to the paper and then fixes the color toner image by heat fixing. A container 22, a cleaning means 2 for removing the color toner remaining on the photoconductor 1 after transfer, and a light irradiation means 6 for destaticizing the photoconductor 1 between the transfer means 3 and the cleaning means 2. is there. Figure 7,
In FIG. 8, 4 is a transfer charger, 5 is a charging unit, 8 is a transfer belt, and 9 is a developing unit.
【０００３】[0003]
【発明が解決しようとする課題】前記及びのような
従来の、感光体を機械的にクリーニングする前に電気的
に除電する感光体のクリーニング方法においては、転写
手段によって帯電させられた感光体帯電電位を充分に除
電できず、感光体のクリーニング不良が発生し易いとい
う問題がある。SUMMARY OF THE INVENTION In the conventional method for cleaning a photosensitive member, in which the charge is electrically eliminated before mechanically cleaning the photosensitive member as described above and in the prior art, the photosensitive member charged by the transfer means is charged. There is a problem that the electric potential cannot be sufficiently removed and cleaning failure of the photoconductor is likely to occur.
【０００４】そこでこの発明の目的は、前記のような従
来の感光体のクリーニング方法のもつ問題を解消し、転
写手段によって帯電させられた感光体帯電電位を充分に
除電できて、クリーニング不良が発生しない感光体のク
リーニング方法、及び感光体帯電電位を除電する光照射
手段の発射光がその近傍に設けた光検知手段の検知精度
を劣化させない電子写真複写機を提供するにある。Therefore, an object of the present invention is to eliminate the above-mentioned problems of the conventional method for cleaning a photosensitive member, to sufficiently remove the charging potential of the photosensitive member charged by the transfer means, and to cause a cleaning failure. Another object of the present invention is to provide a method for cleaning a photoreceptor, and an electrophotographic copying machine in which the emitted light of the light irradiation means for eliminating the charge potential of the photoreceptor does not deteriorate the detection accuracy of the light detection means provided in the vicinity thereof.
【０００５】[0005]
【課題を解決するための手段】この発明は、前記のよう
な目的を達成するために、請求項１の発明は、感光体
と、電圧制御手段を有する転写帯電手段によって転写電
位が印加されるベルト又はローラ状の転写部材を具えた
転写手段と、転写工程後、感光体上に残留するトナーを
除去するクリーニング手段と、静電潜像を形成するため
感光体を帯電させる帯電手段とを具えた電子写真複写機
において、前記転写手段と前記クリーニング手段との間
に光照射手段を設け、この光照射手段によって転写手段
で感光体に生じた帯電電位を減衰させる除電光を照射し
て感光体の帯電電位を減衰させた後、クリーニング手段
によって感光体をクリーニングすることを特徴とするも
のである。請求項２の発明は、感光体と、電圧制御手段
を有する転写帯電手段によって転写電位が印加されるベ
ルト又はローラ状の転写部材を具えた転写手段と、転写
工程後、感光体上に残留するトナーを除去するクリーニ
ング手段と、静電潜像を形成するため感光体を帯電させ
る帯電手段とを具えた電子写真複写機において、前記転
写電位制御手段は転写部材に流れる電流で転写部材によ
って帯電される感光体の帯電電位を画像形成時に前記帯
電手段によって帯電される帯電電位以下に制限して前記
転写部材に電圧を印加し、転写工程後にクリーニング手
段で感光体をクリーニングすることを特徴とするもので
ある。請求項３の発明は、感光体と、電圧制御手段を有
する転写帯電手段によって転写電位が印加されるベルト
又はローラ状の転写部材を具えた転写手段と、転写工程
後、感光体上に残留するトナーを除去するクリーニング
手段と、静電潜像を形成するため感光体を帯電させる帯
電手段と、感光体上に形成された潜像をトナー顕像する
現像手段とを具えた電子写真複写機において、感光体上
に潜像形成を行う露光点の部位と、現像手段との間に感
光体の表面電位を検知する表面電位検知手段を設け、前
記帯電手段の作動を停止させたまま感光体を回転させて
転写部材によって感光体を帯電し、この帯電電位を表面
電位検知手段によって検知して出力して前記電圧制御手
段に入力し、この電圧制御手段は前記転写部材に予め設
定された範囲内に電圧を補正して印加し、転写工程後、
クリーニング手段で感光体をクリーニングすることを特
徴とするものである。請求項４の発明は、感光体と、電
圧制御手段を有する転写帯電手段によって転写電位が印
加されるベルト又はローラ状の転写部材を具えた転写手
段と、転写工程後、感光体上に残留するトナーを除去す
るクリーニング手段と、静電潜像を形成するため感光体
を帯電させる帯電手段とを具えた電子写真複写機におい
て、クリーニング手段が回転する導電性ファーブラシを
有し、この導電性ファーブラシに電位を印加する電位印
加手段を設け、この導電性ファーブラシが感光体に当接
する際、前記電位印加手段は導電性ファーブラシと感光
体との間に放電が生じないように前記転写電位に対応し
て電圧を変化させて導電性ファーブラシに印加し、この
導電性ファーブラシによって感光体を摺擦して、クリー
ニング手段で感光体をクリーニングすることを特徴とす
るものである。請求項５の発明は、感光体と、電圧制御
手段を有する転写帯電手段によって転写電位が印加され
るベルト又はローラ状の転写部材を具えた転写手段と、
転写工程後、感光体上に残留するトナーを除去するクリ
ーニング手段と、静電潜像を形成するため感光体を帯電
させる帯電手段とを具えた電子写真複写機において、ク
リーニング手段が回転する導電性ファーブラシを有し、
感光体と導電性ファーブラシとが接触する部位の導電性
ファーブラシの回転方向の上流側に電気的に設置された
導電性部材を導電性ファーブラシに当接させて設け、前
記導電性ファーブラシが感光体に接触する前に前記導電
性部材に導電性ファーブラシが当接して導電性ファーブ
ラシの帯電電位を放電させるとともに、その導電性ファ
ーブラシによって感光体を摺擦して、クリーニング手段
で感光体をクリーニングすることを特徴とするものであ
る。請求項６の発明は、感光体と、電圧制御手段を有す
る転写帯電手段によって転写電位が印加されるベルト又
はローラ状の転写部材を具えた転写手段と、転写工程
後、感光体上に残留するトナーを除去するクリーニング
手段と、静電潜像を形成するため感光体を帯電させる帯
電手段と、トナー供給制御手段とを具えた電子写真複写
機において、前記転写手段と前記クリーニング手段との
間に光照射手段を設けるとともに、感光体上に形成され
たトナー顕像の反射光を検知して出力し、その出力をト
ナー供給制御手段に入力して現像剤のトナー濃度及び補
給量を所定量に維持させる光検知手段を光照射手段の近
傍に設け、光照射手段によって転写手段で感光体に生じ
た帯電電位を減衰させる除電光を照射して感光体の帯電
電位を減衰させた後、クリーニング手段によって感光体
をクリーニングする前記光照射手段が発光する発光エネ
ルギーのピーク波長が、前記光検知手段の検知感度エネ
ルギーが最大となる波長と異なることを特徴とするもの
である。In order to achieve the above-mentioned object, the invention of claim 1 applies a transfer potential by a photoconductor and a transfer charging means having a voltage control means. A transfer unit having a belt- or roller-shaped transfer member, a cleaning unit that removes toner remaining on the photoconductor after the transfer process, and a charging unit that charges the photoconductor to form an electrostatic latent image. In the electrophotographic copying machine, a light irradiating unit is provided between the transfer unit and the cleaning unit, and the light irradiating unit irradiates the charge removing light for attenuating the charging potential generated on the photoconductor by the transfer unit to the photoconductor. After the charging potential of (1) is attenuated, the photosensitive member is cleaned by the cleaning means. According to a second aspect of the present invention, a photoconductor, a transfer unit including a belt- or roller-shaped transfer member to which a transfer potential is applied by a transfer charging unit having a voltage control unit, and the transfer unit remains on the photoconductor after the transfer process. In an electrophotographic copying machine including a cleaning unit for removing toner and a charging unit for charging a photoconductor to form an electrostatic latent image, the transfer potential control unit is charged by the transfer member with a current flowing through the transfer member. The charging potential of the photosensitive member is limited to a charging potential or less charged by the charging unit during image formation, a voltage is applied to the transfer member, and the photosensitive member is cleaned by the cleaning unit after the transfer step. Is. According to a third aspect of the present invention, there is provided a photoconductor, a transfer unit including a belt- or roller-shaped transfer member to which a transfer potential is applied by a transfer charging unit having a voltage control unit, and the transfer unit remains on the photoconductor after the transfer process. An electrophotographic copying machine comprising: a cleaning unit for removing toner, a charging unit for charging a photosensitive member to form an electrostatic latent image, and a developing unit for developing a latent image formed on the photosensitive member with a toner. , A surface potential detecting means for detecting the surface potential of the photoconductor is provided between a portion of the exposure point for forming a latent image on the photoconductor and the developing means, and the photoconductor is operated while the operation of the charging means is stopped. The photoconductor is rotated to charge the photoconductor by the transfer member, and the charged potential is detected by the surface potential detection means and output to the voltage control means, which voltage control means is within a preset range for the transfer member. Voltage to Correct by applying, after the transfer step,
It is characterized in that the photosensitive member is cleaned by the cleaning means. According to a fourth aspect of the present invention, a photoconductor, a transfer unit including a belt- or roller-shaped transfer member to which a transfer potential is applied by a transfer charging unit having a voltage control unit, and the transfer unit remains on the photoconductor after the transfer process. In an electrophotographic copying machine having a cleaning means for removing toner and a charging means for charging a photoconductor to form an electrostatic latent image, the cleaning means has a conductive fur brush that rotates. A potential applying means for applying a potential to the brush is provided, and when the conductive fur brush comes into contact with the photoconductor, the potential applying means prevents the discharge of the transfer potential between the conductive fur brush and the photoconductor. Voltage is applied to the conductive fur brush in accordance with the above, the photosensitive member is rubbed by the conductive fur brush, and the photosensitive member is cleaned by the cleaning means. And it is characterized in and. According to a fifth aspect of the present invention, there is provided a photoconductor, a transfer unit including a belt- or roller-shaped transfer member to which a transfer potential is applied by a transfer charging unit having a voltage control unit,
After the transfer step, in an electrophotographic copying machine equipped with a cleaning means for removing the toner remaining on the photoconductor and a charging means for charging the photoconductor to form an electrostatic latent image, the cleaning means rotates the conductive material. Have a fur brush,
A conductive member electrically provided on the upstream side in the rotation direction of the conductive fur brush at the portion where the photoconductor and the conductive fur brush come into contact is provided in contact with the conductive fur brush, and the conductive fur brush is provided. Before contacting the photoconductor, the conductive fur brush contacts the conductive member to discharge the charging potential of the conductive fur brush, and the conductive fur brush rubs the photoconductor to remove the charge. It is characterized in that the photoconductor is cleaned. According to a sixth aspect of the present invention, there is provided a photoconductor, a transfer unit including a belt- or roller-shaped transfer member to which a transfer potential is applied by a transfer charging unit having a voltage control unit, and the transfer unit remains on the photoconductor after the transfer process. In an electrophotographic copying machine including a cleaning unit that removes toner, a charging unit that charges a photosensitive member to form an electrostatic latent image, and a toner supply control unit, between the transfer unit and the cleaning unit. In addition to providing the light irradiation means, the reflected light of the toner image formed on the photoconductor is detected and output, and the output is input to the toner supply control means to set the toner concentration and the replenishment amount of the developer to predetermined amounts. A light detecting means for maintaining the light is provided in the vicinity of the light irradiating means, and the light irradiating means irradiates a discharging light for attenuating the charge potential generated on the photoconductor by the transfer means to attenuate the charge potential of the photoconductor. Peak wavelength of the emission energy the light irradiating means for cleaning the photosensitive member by Ningu means emits light, detection sensitivity energy of said light detecting means is characterized in that different from the wavelength of maximum.
【０００６】[0006]
【作用】前記のようなこの発明において、請求項１の発
明は、転写手段とクリーニング手段との間に設けられた
光照射手段によって感光体の帯電電位を減衰させる除電
光を感光体に照射して、転写手段で感光体に生じた帯電
電位を減衰させた後、クリーニング手段によって感光体
をクリーニングする。請求項２の発明は、電圧制御手段
は転写部材に流れる電流で転写部材によって帯電される
感光体の帯電電位が画像形成時に前記帯電手段によって
帯電される帯電電位以下に制限して転写部材に電圧を印
加し、転写工程後にクリーニング手段で感光体をクリー
ニングする。請求項３の発明は、感光体上に潜像形成を
行う露光点の部位と、現像手段との間に感光体の表面電
位を検知する表面電位検知手段を設けていて、前記帯電
手段の作動を停止させたまま感光体を回転させて転写部
材によって感光体を帯電し、この帯電電位を表面電位検
知手段によって検知して出力して前記電圧制御手段に入
力し、この電圧制御手段は前記転写部材に予め設定され
た範囲内に電圧を補正して印加し、転写工程後、クリー
ニング手段で感光体をクリーニングする。請求項４の発
明は、クリーニング手段が回転する導電性ファーブラシ
を有しており、この導電性ファーブラシに電位を印加す
る電位印加手段を設けていて、この導電性ファーブラシ
が感光体に当接する際、前記電位印加手段は導電性ファ
ーブラシと感光体との間に放電が生じないように前記転
写電位に対応して電圧を変化させて導電性ファーブラシ
に印加し、感光体と導電性ファーブラシとの間で放電を
防止し、トナーが導電性ファーブラシに付着させずにこ
の導電性ファーブラシによって感光体を摺擦して、クリ
ーニング手段で感光体をクリーニングする。請求項５の
発明は、クリーニング手段が回転する導電性ファーブラ
シを有しており、感光体と導電性ファーブラシとが接触
する部位の導電性ファーブラシの回転方向の上流側に電
気的に設置された導電性部材を導電性ファーブラシに当
接させて設けていて、前記導電性ファーブラシが回転し
て感光体に接触する前に前記導電性部材によって導電性
ファーブラシの帯電電位を放電させるとともに感光体を
摺擦して、クリーニング手段で感光体をクリーニングす
る。請求項６の発明は、転写手段とクリーニング手段と
の間に光照射手段を設けるとともに、感光体上に形成さ
れたトナー顕像の反射光を検知して出力し、その出力を
トナー供給制御手段に入力して現像剤のトナー濃度及び
補給量を所定量に維持させる光検知手段を光照射手段の
近傍に設けていて、光照射手段によって感光体の帯電電
位を減衰させる除電光を感光体に照射して、感光体の帯
電電位を減衰させた後、転写手段で感光体に生じたクリ
ーニング手段によって感光体をクリーニングする前記光
照射手段が発光する発光エネルギーのピーク波長が、光
検知手段の検知感度エネルギーが最大となる波長と異な
っていて、光照射手段の光が光検知手段に入光しても光
検知手段の検知精度には影響を与えない。In this invention as described above, the invention of claim 1 irradiates the photosensitive member with a discharging light for attenuating the charging potential of the photosensitive member by the light irradiation means provided between the transfer means and the cleaning means. After the transfer means attenuates the charging potential generated on the photoconductor, the cleaning means cleans the photoconductor. According to a second aspect of the present invention, the voltage control means limits the voltage applied to the transfer member to a value equal to or less than the charge potential charged by the charging means at the time of image formation by the current flowing through the transfer member so that the charging potential of the photoconductor is charged. Is applied, and the photoconductor is cleaned by a cleaning means after the transfer step. According to a third aspect of the present invention, a surface potential detecting means for detecting the surface potential of the photosensitive member is provided between the exposure point portion for forming a latent image on the photosensitive member and the developing means, and the charging means operates. The photosensitive member is rotated by the transfer member while being stopped, the photosensitive member is charged by the transfer member, and the charged potential is detected and output by the surface potential detecting means and input to the voltage control means. The voltage is corrected and applied to the member within a preset range, and after the transfer step, the photosensitive member is cleaned by the cleaning unit. According to a fourth aspect of the present invention, the cleaning means has a rotating conductive fur brush, and the potential applying means for applying a potential to the conductive fur brush is provided, and the conductive fur brush contacts the photoconductor. At the time of contact, the potential applying means changes the voltage corresponding to the transfer potential and applies it to the conductive fur brush so that no discharge occurs between the conductive fur brush and the photosensitive body. The discharge is prevented between the fur brush and the conductive fur brush, and the photosensitive member is rubbed by the conductive fur brush without adhering the toner to the conductive fur brush, and the photosensitive member is cleaned by the cleaning unit. According to a fifth aspect of the present invention, the cleaning unit has a rotating conductive fur brush, and is electrically installed on the upstream side of the rotating direction of the conductive fur brush at the portion where the photoconductor and the conductive fur brush come into contact with each other. The electrically conductive fur brush is provided in contact with the electrically conductive fur brush, and the electrically conductive member discharges the charging potential of the electrically conductive fur brush before the electrically conductive fur brush rotates and comes into contact with the photoconductor. At the same time, the photoconductor is rubbed, and the photoconductor is cleaned by the cleaning means. According to a sixth aspect of the present invention, a light irradiation unit is provided between the transfer unit and the cleaning unit, and the reflected light of the toner image formed on the photoconductor is detected and output, and the output is the toner supply control unit. Is provided in the vicinity of the light irradiating means for maintaining the toner concentration and the replenishment amount of the developer at a predetermined amount, and the light irradiating means is used to remove the charge eliminating light to the photoreceptor. After the irradiation, the charging potential of the photoconductor is attenuated, and then the peak wavelength of the light emission energy emitted by the light irradiation unit for cleaning the photoconductor by the cleaning unit generated on the photoconductor by the transfer unit is detected by the light detection unit. Even if the light of the light irradiation means is incident on the light detection means, the detection accuracy of the light detection means is not affected even if the light of the light irradiation means has a wavelength different from the maximum sensitivity energy.
【０００７】[0007]
【実施例】この発明を実施する電子写真複写機におい
て、前記従来のものと同様の部分には同一の符号を用い
て説明を省略し、主として異なる部分について説明す
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the electrophotographic copying machine embodying the present invention, the same parts as those of the conventional one will be designated by the same reference numerals, and the description thereof will be omitted.
【０００８】図１に示す第１実施例は、転写手段３と、
クリーニング手段２との間に感光体１の帯電電位を除去
する除電ランプを有する光照射手段６（以下ＰＣＬとい
う）を設け、転写手段３はベルト又はローラ状の転写部
材８と、その転写部材８に転写電位を印加する図示しな
い演算手段を具えた電圧制御手段18を有する転写帯電手
段４とを具えている。なお９は現像手段、30はクリーニ
ング後除電ランプ、31はクリーニングブレード、32はト
ナー搬送コイルをそれぞれ示す。The first embodiment shown in FIG. 1 includes a transfer means 3 and
A light irradiation unit 6 (hereinafter referred to as PCL) having a charge eliminating lamp for removing the charging potential of the photoconductor 1 is provided between the cleaning unit 2 and the transfer unit 3, and the transfer unit 3 is a belt or roller transfer member 8 and the transfer member 8 thereof. And a transfer charging means 4 having a voltage control means 18 having a calculation means (not shown) for applying a transfer potential. Reference numeral 9 is a developing means, 30 is a discharge lamp after cleaning, 31 is a cleaning blade, and 32 is a toner carrying coil.
【０００９】このようなものにあって、転写工程後、感
光体１にＰＣＬ６によって感光体１の帯電電位を減衰さ
せるレベルの光照射を行った後、クリーニング手段２に
よって感光体１のクリーニングを行う。すなわち、転写
工程を経ると感光体１は図２に示すように帯電電位が上
昇しており、ＰＣＬ６がない場合、給紙はＢ５縦使用
時、転写部材８に印加する転写電流が−80μAの場合、
コピー画像上にクリーニング不良画像が発生するが、こ
れに対してＰＣＬ６によって光照射をすると転写電流が
−100μAであっても感光体１の帯電電位を減衰させるこ
とができてクリーニング不良が発生しない。しかし、光
照射を行った場合においてもＰＣＬ６の光照射を受けた
感光体１の帯電電位は、図２に示すようにその絶対値に
おいて600Ｖより低い状態にするエネルギーレベルの光
照射を行えばクリーニング不良画像が発生しないので、
その光照射エネルギーレベルは画像形成の露光強度と同
等のエネルギーレベルのもので充分であり、感光体１の
光疲労には影響を及ぼさない。In such a structure, after the transfer step, the photoconductor 1 is irradiated with light at a level at which the charging potential of the photoconductor 1 is attenuated by the PCL 6, and then the photoconductor 1 is cleaned by the cleaning means 2. . That is, the charging potential of the photoconductor 1 has risen as shown in FIG. 2 after the transfer process, and when the PCL 6 is not provided, the paper is fed in the B5 portrait mode, and the transfer current applied to the transfer member 8 is −80 μA. If
A defective cleaning image is generated on the copy image. On the other hand, when the PCL 6 irradiates light, the charging potential of the photoconductor 1 can be attenuated even if the transfer current is −100 μA, and the defective cleaning does not occur. However, even when light irradiation is performed, the charging potential of the photoconductor 1 that has received the light irradiation of the PCL 6 is cleaned by performing light irradiation at an energy level such that the absolute value thereof is lower than 600 V as shown in FIG. Since no bad image occurs,
It is sufficient that the light irradiation energy level has the same energy level as the exposure intensity for image formation, and does not affect the light fatigue of the photoconductor 1.
【００１０】前記の実施例において、ＰＣＬを設けない
こととすると、電圧制御手段によって転写部材に転写電
圧を印加し、そのときの転写電位値によって流れる転写
電流、すなわち、転写電位と比例関係にある転写電流を
制限して転写部材を帯電させ、転写工程後に行われるク
リーニングにおいてクリーニング不良を発生させないよ
うにして感光体１のクリーニングを行うこととなる。そ
れは転写部材を感光体に当接した際、通常の画像形成時
に帯電手段によって与えられる感光体の帯電電位以下に
なるように、転写部材に流れる転写電流を制限する。そ
の最大上限値は−150μAと設定されており、転写紙サイ
ズによって切換えられるものである。それは狭巾の転写
紙程感光体側に電流が流れ易くなるので、それぞれ転写
紙サイズに対応して転写電流上限値を設定している。そ
れは転写紙が狭巾のものは広巾のものより少なくしてい
て、Ｂ５縦の紙サイズで−60μA、Ａ４横の紙サイズで
−80μAとなるように設定されており、このように転写
電流を選択し転写部材８に印加して、転写工程後、感光
体１をクリーニングする。In the above-mentioned embodiment, if the PCL is not provided, the transfer voltage is applied to the transfer member by the voltage control means, and the transfer current flowing according to the transfer potential value at that time, that is, the transfer potential is proportional to the transfer current. The transfer member is charged by limiting the transfer current, and the photosensitive member 1 is cleaned without causing cleaning failure in the cleaning performed after the transfer process. It limits the transfer current flowing through the transfer member so that when the transfer member is brought into contact with the photoconductor, it becomes equal to or lower than the charging potential of the photoconductor given by the charging means during normal image formation. The maximum upper limit value is set to -150 μA, which can be switched depending on the transfer paper size. As the transfer paper has a narrower width, the current easily flows toward the photoconductor, so that the transfer current upper limit value is set corresponding to each transfer paper size. The width of the transfer paper is narrower than that of the wide paper, and it is set to be -60 μA for B5 vertical paper size and -80 μA for A4 horizontal paper size. After selecting and applying to the transfer member 8, the photoconductor 1 is cleaned after the transfer process.
【００１１】図３に示す第２実施例は、電位センサを有
する表面電位検知手段16を、感光体１上に潜像を形成す
る露光部位15と潜像をトナーによって現像する現像手段
９との間に設けたものである。画像形成動作に入る前
に、潜像を形成するために感光体１を帯電させる帯電手
段５の作動を停止させて感光体１を回転させ、転写電流
の２つの水準、すなわち、−20μAと、続いて−100μA
とを転写部材８に印加して感光体１を帯電させ、それら
による感光体１の帯電電位を表面電位検知手段16によっ
て検知して出力し、それらの出力と紙サイズ信号とを電
圧制御手段18の図示しない演算手段に入力して、転写部
材差、機械差、感光体差等に伴う感光体１の帯電電位の
ばらつきと、紙サイズとの補正を行う演算処理をして、
転写電流を図２に示すように感光体１の帯電電位をＢ５
縦において600Ｖ、Ａ４横において400Ｖを与えるものに
なるように修正した後、画像形成の動作を実行させて転
写工程後、感光体１をクリーニングする。このことによ
って感光体１のクリーニングをより確実なものとするこ
とができる。In the second embodiment shown in FIG. 3, a surface potential detecting means 16 having a potential sensor is provided with an exposing portion 15 for forming a latent image on the photoconductor 1 and a developing means 9 for developing the latent image with toner. It is provided between them. Before starting the image forming operation, the operation of the charging means 5 for charging the photoconductor 1 to form a latent image is stopped, the photoconductor 1 is rotated, and two levels of the transfer current, that is, −20 μA, Then −100 μA
Are applied to the transfer member 8 to charge the photoconductor 1, and the charging potential of the photoconductor 1 by them is detected by the surface potential detection means 16 and output, and the output and the paper size signal are controlled by the voltage control means 18. Is input to a calculation unit (not shown) to perform a calculation process for correcting a variation in the charging potential of the photoconductor 1 due to a transfer member difference, a mechanical difference, a photoconductor difference, and the like, and the paper size.
As for the transfer current, as shown in FIG.
After correction so as to give 600 V in the vertical direction and 400 V in the A4 horizontal direction, the image forming operation is executed, and the photoconductor 1 is cleaned after the transfer step. As a result, the cleaning of the photoconductor 1 can be made more reliable.
【００１２】第２実施例において、クリーニング手段に
導電性ファーブラシを用いたものは、導電性ファーブラ
シと感光体との間の電位差によって放電現象が発生しな
いように導電性ファーブラシにバイアス電圧を電圧印加
手段によって印加するものである。導電性ファーブラシ
と、感光体との電位差による放電現象が発生しない条件
は図２，６から絶対値が400Ｖ以下であり、導電性ファ
ーブラシに放電現象が発生しない電位差を生じるような
バイアス電圧を印加して感光体をクリーニングする。In the second embodiment, in which the conductive fur brush is used as the cleaning means, the bias voltage is applied to the conductive fur brush so that the discharge phenomenon does not occur due to the potential difference between the conductive fur brush and the photosensitive member. It is applied by a voltage applying means. As shown in FIGS. 2 and 6, the absolute value is 400 V or less under the condition that the discharge phenomenon due to the potential difference between the conductive fur brush and the photosensitive member does not occur. Apply to clean the photoreceptor.
【００１３】第２実施例におけるクリーニング手段２は
図４，５に示すようであって、導電性ファーブラシ10
は、導電性ファーブラシ10が感光体１に接触する前に図
４に示す除電ブラシ11、又は、図５に示す除電ワイヤー
12を設けているものである。これらの放電手段は電気的
に設置したものであり、それによって導電性ファーブラ
シ10の帯電を放電させ、かつ除電ブラシ11又は除電ワイ
ヤー12は常にフリッカーでトナーが除去された導電性フ
ァーブラシ10で清掃されるようにしてクリーニング性能
を持続させ、その導電性ファーブラシ10によって感光体
１を摺擦してクリーニングする。The cleaning means 2 in the second embodiment is as shown in FIGS.
Is the static elimination brush 11 shown in FIG. 4 or the static elimination wire shown in FIG. 5 before the conductive fur brush 10 contacts the photoconductor 1.
Twelve are provided. These discharging means are electrically installed, thereby discharging the charge of the conductive fur brush 10, and the static elimination brush 11 or the static elimination wire 12 is always the conductive fur brush 10 whose toner is removed by flicker. The cleaning performance is maintained by being cleaned, and the electroconductive fur brush 10 rubs the photoreceptor 1 for cleaning.
【００１４】図７に示す第３実施例は、転写手段３はベ
ルト又はローラ状の転写部材８と、その転写部材８に転
写電位を印加する図示しない演算手段を具えた電圧制御
手段18を有する転写帯電手段４とを具え、転写手段３
と、クリーニング手段２との間に感光体１の帯電電位を
除去する除電ランプを有するＰＣＬ６を設け、このＰＣ
Ｌ６の近傍に光検知センサを有する光検知手段７（以下
Ｐセンサという）を設けたものである。このＰセンサ７
は感光体１上に形成されたトナー顕像を反射光検知で現
像能力を検知する図示しない光センサを有しており、Ｐ
ＣＬ６の光照射で感光体１の帯電電位を減衰させて感光
体１のクリーニングを行う際、ＰＣＬ６の光がＰセンサ
７に入光しても、Ｐセンサ７の検知精度に影響を与えな
いようにしたものであって、ＰＣＬ６の発光のピーク波
長と、Ｐセンサ７の受光感度のピーク波長とは異なるも
のとしていて、それらの波長はＰＣＬ６の発光ピーク波
長が600〜700nm（赤色光）、Ｐセンサ７の受光感度のピ
ーク波長は900〜950nm（赤外光）である。なお９は現像
手段、30はクリーニング後除電ランプ、31はクリーニン
グブレード、32はトナー搬送コイルをそれぞれ示す。In the third embodiment shown in FIG. 7, the transfer means 3 has a belt- or roller-shaped transfer member 8 and a voltage control means 18 having a calculation means (not shown) for applying a transfer potential to the transfer member 8. Transfer charging means 4 and transfer means 3
And a cleaning means 2 are provided with a PCL 6 having a discharge lamp for removing the charging potential of the photoconductor 1.
A light detecting means 7 having a light detecting sensor (hereinafter referred to as a P sensor) is provided in the vicinity of L6. This P sensor 7
Has an optical sensor (not shown) for detecting the developing ability of the toner image formed on the photoconductor 1 by detecting reflected light.
When cleaning the photoconductor 1 by attenuating the charging potential of the photoconductor 1 by the light irradiation of CL6, even if the light of the PCL6 enters the P sensor 7, it does not affect the detection accuracy of the P sensor 7. And the peak wavelength of the light emission of the PCL6 and the peak wavelength of the light receiving sensitivity of the P sensor 7 are different, and those wavelengths are such that the light emission peak wavelength of the PCL6 is 600 to 700 nm (red light), P The peak wavelength of the light receiving sensitivity of the sensor 7 is 900 to 950 nm (infrared light). Reference numeral 9 is a developing means, 30 is a discharge lamp after cleaning, 31 is a cleaning blade, and 32 is a toner carrying coil.
【００１５】[0015]
【発明の効果】この発明は、前記のようであって、請求
項１の発明は、感光体と、電圧制御手段を有する転写帯
電手段によって転写電位が印加されるベルト又はローラ
状の転写部材を具えた転写手段と、転写工程後、感光体
上に残留するトナーを除去するクリーニング手段と、静
電潜像を形成するため感光体を帯電させる帯電手段とを
具えた電子写真複写機において、前記転写手段と前記ク
リーニング手段との間に光照射手段を設け、この光照射
手段によって転写手段で感光体に生じた帯電電位を減衰
させる除電光を照射して感光体の帯電電位を減衰させた
後、クリーニング手段によって感光体をクリーニングす
るので、転写手段によって帯電させられた感光体帯電電
位を充分除電できて、クリーニング不良が発生しないと
いう効果がある。請求項２の発明は、感光体と、電圧制
御手段を有する転写帯電手段によって転写電位が印加さ
れるベルト又はローラ状の転写部材を具えた転写手段
と、転写工程後、感光体上に残留するトナーを除去する
クリーニング手段と、静電潜像を形成するため感光体を
帯電させる帯電手段とを具えた電子写真複写機におい
て、前記電圧制御手段は、転写部材に流れる電流で転写
部材によって帯電される感光体の帯電電位を画像形成時
に前記帯電手段によって帯電される帯電電位以下になる
ように制限して前記転写部材に電圧を印加し、転写工程
後にクリーニング手段で感光体をクリーニングするの
で、感光体の過剰帯電が防止できて、クリーニング不良
を防止することができるという効果がある。請求項３の
発明は、感光体と、電圧制御手段を有する転写帯電手段
によって転写電位が印加されるベルト又はローラ状の転
写部材を具えた転写手段と、転写工程後、感光体上に残
留するトナーを除去するクリーニング手段と、静電潜像
を形成するため感光体を帯電させる帯電手段と、感光体
上に形成された潜像をトナー顕像する現像手段とを具え
た電子写真複写機において、感光体上に潜像形成を行う
露光点の部位と、現像手段との間に感光体の表面電位を
検知する表面電位検知手段を設け、前記帯電手段の作動
を停止させたまま感光体を回転させて転写部材によって
感光体を帯電し、この帯電電位を表面電位検知手段によ
って検知して出力して前記電圧制御手段に入力し、この
電圧制御手段は前記転写部材に予め設定された範囲内に
電圧を補正して印加して転写工程後、感光体をクリーニ
ング手段で感光体をクリーニングするので、感光体の過
剰帯電が防止できるのでクリーニング不良を確実に防止
することができるという効果がある。請求項４の発明
は、感光体と、電圧制御手段を有する転写帯電手段によ
って転写電位が印加されるベルト又はローラ状の転写部
材を具えた転写手段と、転写工程後、感光体上に残留す
るトナーを除去するクリーニング手段と、静電潜像を形
成するため感光体を帯電させる帯電手段とを具えた電子
写真複写機において、クリーニング手段が回転する導電
性ブラシを有し、この導電性ブラシに電位を印加する電
位印加手段を設け、この導電性ブラシが感光体に当接す
る際、前記電位印加手段は導電性ブラシと感光体との間
に放電が生じないように前記転写電位に対応して電圧を
変化させて導電性ブラシに印加し、この導電性ブラシに
よって感光体を摺擦して、クリーニング手段で感光体を
クリーニングするので、転写工程での感光体帯電電位が
高い場合でも感光体と導電性ブラシとの間の放電が防止
できて、トナーが帯電することなく導電性ブラシのトナ
ー除去効果が低減せず、クリーニング不良を発生しない
という効果がある。請求項５の発明は、感光体と、電圧
制御手段を有する転写帯電手段によって転写電位が印加
されるベルト又はローラ状の転写部材を具えた転写手段
と、転写工程後、感光体上に残留するトナーを除去する
クリーニング手段と、静電潜像を形成するため感光体を
帯電させる帯電手段とを具えた電子写真複写機におい
て、クリーニング手段が回転する導電性ブラシを有し、
感光体と導電性ブラシとが接触する部位の導電性ブラシ
の回転方向の上流側に電気的に接地された導電性部材を
導電性ブラシに当接させて設け、前記導電性ブラシが感
光体に接触する前に前記導電性部材によって導電性ブラ
シの帯電電位を放電させるとともに感光体を摺擦して、
クリーニング手段で感光体をクリーニングするので、導
電性ブラシが除電され、それによって感光体の転写工程
での帯電電位が高い場合でも帯電電位が除電されて、ク
リーニング不良を発生することがないという効果があ
る。請求項６の発明は、感光体と、電圧制御手段を有す
る転写帯電手段によって転写電位が印加されるベルト又
はローラ状の転写部材を具えた転写手段と、転写工程
後、感光体上に残留するトナーを除去するクリーニング
手段と、静電潜像を形成するため感光体を帯電させる帯
電手段と、トナー供給制御手段とを具えた電子写真複写
機において、前記転写手段と前記クリーニング手段との
間に光照射手段を設けるとともに、感光体上に形成され
たトナー顕像の反射光を検知して出力し、その出力をト
ナー供給制御手段に入力して現像剤のトナー濃度及び補
給量を所定量に維持させる光検知手段を光照射手段の近
傍に設け、光照射手段によって転写手段で感光体に生じ
た帯電電位を減衰させる除電光を照射して感光体の帯電
電位を減衰させた後、クリーニング手段によって感光体
をクリーニングする前記光照射手段が発光する発光エネ
ルギーのピーク波長が、前記光検知手段の検知感度エネ
ルギーが最大となる波長と異なるので、光検知手段は光
照射手段の発光によって誤検知をすることがなくて、検
知精度が高いという効果がある。The present invention is as described above, and the invention of claim 1 provides a belt-shaped or roller-shaped transfer member to which a transfer potential is applied by a transfer charging unit having a voltage control unit. An electrophotographic copying machine comprising: a transfer unit, a cleaning unit that removes toner remaining on the photoconductor after the transfer process, and a charging unit that charges the photoconductor to form an electrostatic latent image. After the light irradiating means is provided between the transfer means and the cleaning means, the light irradiating means irradiates the charge removing potential for attenuating the charge potential generated on the photoconductor by the transfer means to attenuate the charge potential of the photoconductor. Since the photosensitive member is cleaned by the cleaning unit, the charging potential of the photosensitive member charged by the transfer unit can be sufficiently removed, and the cleaning failure does not occur. According to a second aspect of the present invention, a photoconductor, a transfer unit including a belt- or roller-shaped transfer member to which a transfer potential is applied by a transfer charging unit having a voltage control unit, and the transfer unit remains on the photoconductor after the transfer process. In an electrophotographic copying machine including a cleaning unit for removing toner and a charging unit for charging a photoconductor to form an electrostatic latent image, the voltage control unit is charged by the transfer member with a current flowing through the transfer member. The charging potential of the photosensitive member is limited so as to be equal to or lower than the charging potential charged by the charging unit during image formation, and a voltage is applied to the transfer member, and the photosensitive member is cleaned by the cleaning unit after the transfer step. There is an effect that excessive charging of the body can be prevented and defective cleaning can be prevented. According to a third aspect of the present invention, there is provided a photoconductor, a transfer unit including a belt- or roller-shaped transfer member to which a transfer potential is applied by a transfer charging unit having a voltage control unit, and the transfer unit remains on the photoconductor after the transfer process. An electrophotographic copying machine comprising: a cleaning unit for removing toner, a charging unit for charging a photosensitive member to form an electrostatic latent image, and a developing unit for developing a latent image formed on the photosensitive member with a toner. , A surface potential detecting means for detecting the surface potential of the photoconductor is provided between a portion of the exposure point for forming a latent image on the photoconductor and the developing means, and the photoconductor is operated while the operation of the charging means is stopped. The photoconductor is rotated to charge the photoconductor by the transfer member, and the charged potential is detected by the surface potential detection means and output to the voltage control means, which voltage control means is within a preset range for the transfer member. Voltage to After the transfer step is applied to correct, because cleaning the photosensitive member of the photosensitive member by a cleaning means, there is an effect that since the excessive charging of the photosensitive member can be prevented can be reliably prevented poor cleaning. According to a fourth aspect of the present invention, a photoconductor, a transfer unit including a belt- or roller-shaped transfer member to which a transfer potential is applied by a transfer charging unit having a voltage control unit, and the transfer unit remains on the photoconductor after the transfer process. In an electrophotographic copying machine having a cleaning means for removing toner and a charging means for charging a photoconductor to form an electrostatic latent image, the cleaning means has a conductive brush that rotates, and the conductive brush is A potential applying means for applying a potential is provided, and when the conductive brush comes into contact with the photoconductor, the potential applying means responds to the transfer potential so that no discharge occurs between the conductive brush and the photoconductor. The voltage is changed and applied to the conductive brush, and the photosensitive member is rubbed by the conductive brush, and the cleaning unit cleans the photosensitive member. If any time prevents discharge between the photosensitive member and the conductive brush, the toner is not reduced toner removal effect of the conductive brush without charge, there is an effect that generates no cleaning failure. According to a fifth aspect of the present invention, the photoconductor, the transfer means having a belt or roller-shaped transfer member to which a transfer electric potential is applied by the transfer charging means having the voltage control means, and the transfer means remaining on the photoconductor after the transfer step. In an electrophotographic copying machine having a cleaning means for removing toner and a charging means for charging a photoconductor to form an electrostatic latent image, the cleaning means has a conductive brush that rotates.
A conductive member that is electrically grounded is provided in contact with the conductive brush on the upstream side in the rotation direction of the conductive brush at the portion where the photosensitive member and the conductive brush come into contact, and the conductive brush is attached to the photosensitive member. Before contacting, the charging potential of the conductive brush is discharged by the conductive member and the photoconductor is rubbed,
Since the cleaning means cleans the photoconductor, the conductive brush is neutralized, so that even if the charge potential is high in the transfer step of the photoconductor, the charge potential is neutralized, and there is no effect that a cleaning failure does not occur. is there. According to a sixth aspect of the present invention, there is provided a photoconductor, a transfer unit including a belt- or roller-shaped transfer member to which a transfer electric potential is applied by a transfer charging unit having a voltage control unit, and the transfer unit remains on the photoconductor after the transfer process. In an electrophotographic copying machine including a cleaning unit that removes toner, a charging unit that charges a photosensitive member to form an electrostatic latent image, and a toner supply control unit, between the transfer unit and the cleaning unit. A light irradiation unit is provided, and the reflected light of the toner image formed on the photoconductor is detected and output, and the output is input to the toner supply control unit to set the toner concentration and the replenishment amount of the developer to predetermined amounts. A light detecting means for maintaining the light is provided in the vicinity of the light irradiating means, and the light irradiating means irradiates the charge removing light for attenuating the charging potential generated on the photoreceptor by the transfer means to attenuate the charging potential of the photoreceptor, Since the peak wavelength of the light emission energy emitted by the light irradiation means for cleaning the photoconductor by the burning means is different from the wavelength at which the detection sensitivity energy of the light detection means becomes maximum, the light detection means may be erroneous due to the light emission of the light irradiation means. There is an effect that the detection accuracy is high without performing the detection.
【図１】この発明の第１実施例の概略縦断面図である。FIG. 1 is a schematic vertical sectional view of a first embodiment of the present invention.
【図２】同上の転写電流と、クリーニング性グランク及
び感光体帯電電位との関係を表す特性図である。FIG. 2 is a characteristic diagram showing a relationship between a transfer current, a cleaning grandk and a photoconductor charging potential, which are the same as the above.
【図３】同上の第２実施例の概略縦断面図である。FIG. 3 is a schematic vertical sectional view of a second embodiment of the above.
【図４】同上の第２実施例のクリーニング手段の部分を
示す概略縦断面図である。FIG. 4 is a schematic vertical sectional view showing a portion of the cleaning means of the second embodiment of the above.
【図５】同上の第２実施例の他のクリーニング手段の部
分を示す概略縦断面図である。FIG. 5 is a schematic vertical sectional view showing a portion of another cleaning means of the second embodiment.
【図６】同上の導電性ファーブラシ電流と転写電流との
関係を表す特性図である。FIG. 6 is a characteristic diagram showing the relationship between the conductive fur brush current and the transfer current in the above.
【図７】同上の第３実施例の概略縦断面図である。FIG. 7 is a schematic vertical sectional view of a third embodiment of the above.
【図８】従来の電子写真複写機の概略縦断面図である。FIG. 8 is a schematic vertical sectional view of a conventional electrophotographic copying machine.
【図９】同上の他の電子写真複写機の概略縦断面図であ
る。FIG. 9 is a schematic vertical sectional view of another electrophotographic copying machine of the above.
１ 感光体 ２ クリーニング手段 ３ 転写手段 ４ 転写帯電手段 ５ 帯電手段 ６ 光照射手段 ７ 受光手段 ８ 転写部材 10 導電性ファーブラシ 11 除電ブラシ 12 ワイヤー 16 表面電位検知手段 1 Photoreceptor 2 Cleaning Means 3 Transfer Means 4 Transfer Charging Means 5 Charging Means 6 Light Irradiating Means 7 Light Receiving Means 8 Transfer Member 10 Conductive Fur Brush 11 Eliminating Brush 12 Wire 16 Surface Potential Detecting Means
フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｇ０３Ｇ 21/08 Ｇ０３Ｇ 21/00 ３４０ ３４２ (72)発明者 高橋 貞夫 東京都大田区中馬込１丁目３番６号 株式 会社リコー内Continuation of front page (51) Int.Cl. 6 Identification number Office reference number FI Technical display location G03G 21/08 G03G 21/00 340 342 (72) Inventor Sadao Takahashi 1-3-6 Nakamagome, Ota-ku, Tokyo No. Stock Company Ricoh
Claims (6)
電手段によって転写電位が印加されるベルト又はローラ
状の転写部材を具えた転写手段と、転写工程後、感光体
上に残留するトナーを除去するクリーニング手段と、静
電潜像を形成するため感光体を帯電させる帯電手段とを
具えた電子写真複写機において、前記転写手段と前記ク
リーニング手段との間に光照射手段を設け、この光照射
手段によって転写手段で感光体に生じた帯電電位を減衰
させる除電光を照射して感光体の帯電電位を減衰させた
後、クリーニング手段によって感光体をクリーニングす
ることを特徴とする感光体のクリーニング方法。1. A transfer member comprising a photosensitive member, a belt- or roller-shaped transfer member to which a transfer electric potential is applied by a transfer charging unit having a voltage control unit, and toner remaining on the photosensitive member after the transfer step. In an electrophotographic copying machine having a cleaning means for removing and a charging means for charging a photoconductor to form an electrostatic latent image, a light irradiation means is provided between the transfer means and the cleaning means. Cleaning of the photoconductor, characterized in that the irradiation unit irradiates the charge potential of the photoconductor on the photoconductor by the transfer unit to attenuate the charge potential of the photoconductor and then the cleaning unit cleans the photoconductor. Method.
電手段によって転写電位が印加されるベルト又はローラ
状の転写部材を具えた転写手段と、転写工程後、感光体
上に残留するトナーを除去するクリーニング手段と、静
電潜像を形成するため感光体を帯電させる帯電手段とを
具えた電子写真複写機において、前記電圧制御手段は、
転写部材に流れる電流で転写部材によって帯電される感
光体の帯電電位を画像形成時に前記帯電手段によって帯
電される帯電電位以下に制限して前記転写部材に電圧を
印加し、転写工程後、クリーニング手段で感光体をクリ
ーニングすることを特徴とする感光体のクリーニング方
法。2. A transfer member comprising a photosensitive member, a belt- or roller-shaped transfer member to which a transfer electric potential is applied by a transfer charging unit having a voltage control unit, and toner remaining on the photosensitive member after the transfer step. In an electrophotographic copying machine comprising cleaning means for removing and charging means for charging the photoconductor to form an electrostatic latent image, the voltage control means comprises:
The charge potential of the photoconductor charged by the transfer member by the current flowing in the transfer member is limited to the charge potential charged by the charging unit or less at the time of image formation to apply a voltage to the transfer member, and after the transfer process, the cleaning unit A method for cleaning a photoconductor, which comprises cleaning the photoconductor with.
電手段によって転写電位が印加されるベルト又はローラ
状の転写部材を具えた転写手段と、転写工程後、感光体
上に残留するトナーを除去するクリーニング手段と、静
電潜像を形成するため感光体を帯電させる帯電手段と、
感光体上に形成された潜像をトナー顕像する現像手段と
を具えた電子写真複写機において、感光体上に潜像形成
を行う露光点の部位と、現像手段との間に感光体の表面
電位を検知する表面電位検知手段を設け、前記帯電手段
の作動を停止させたまま感光体を回転させて転写部材に
よって感光体を帯電し、この帯電電位を表面電位検知手
段によって検知して出力して前記電圧制御手段に入力
し、この電圧制御手段は前記転写部材に予め設定された
範囲内に電圧を補正して印加し、転写工程後、クリーニ
ング手段で感光体をクリーニングすることを特徴とする
感光体のクリーニング方法。3. A transfer member comprising a photosensitive member, a belt or roller-shaped transfer member to which a transfer potential is applied by a transfer charging unit having a voltage control unit, and toner remaining on the photosensitive member after the transfer step. Cleaning means for removing, charging means for charging the photoreceptor to form an electrostatic latent image,
In an electrophotographic copying machine equipped with a developing means for developing a latent image formed on a photosensitive member with a toner, a photosensitive member is provided between a portion of an exposure point for forming a latent image on the photosensitive member and the developing means. Surface potential detecting means for detecting the surface potential is provided, the photosensitive member is rotated while the operation of the charging means is stopped and the photosensitive member is charged by the transfer member, and the charged potential is detected by the surface potential detecting means and output. Then, the voltage control means corrects and applies the voltage to the transfer member within a preset range, and the cleaning means cleans the photoconductor after the transfer step. How to clean the photoreceptor.
電手段によって転写電位が印加されるベルト又はローラ
状の転写部材を具えた転写手段と、転写工程後、感光体
上に残留するトナーを除去するクリーニング手段と、静
電潜像を形成するため感光体を帯電させる帯電手段とを
具えた電子写真複写機において、クリーニング手段が回
転する導電性ファーブラシを有し、この導電性ファーブ
ラシに電位を印加する電位印加手段を設け、この導電性
ファーブラシが感光体に当接する際、前記電位印加手段
は導電性ファーブラシと感光体との間に放電が生じない
ように前記転写電位に対応して電圧を変化させて導電性
ファーブラシに印加し、この導電性ファーブラシによっ
て感光体を摺擦して、クリーニング手段で感光体をクリ
ーニングすることを特徴とする感光体のクリーニング方
法。4. A transfer member comprising a photosensitive member, a belt- or roller-shaped transfer member to which a transfer potential is applied by a transfer charging unit having a voltage control unit, and toner remaining on the photosensitive member after the transfer step. In an electrophotographic copying machine having a cleaning means for removing and a charging means for charging a photoconductor to form an electrostatic latent image, the cleaning means has a rotating conductive fur brush. An electric potential applying means for applying an electric potential is provided, and when the conductive fur brush comes into contact with the photoconductor, the electric potential applying means responds to the transfer electric potential so as not to generate discharge between the conductive fur brush and the photoconductor. Then, the voltage is changed and applied to the conductive fur brush. The conductive fur brush rubs the photosensitive member, and the cleaning unit cleans the photosensitive member. A characteristic method for cleaning a photoconductor.
電手段によって転写電位が印加されるベルト又はローラ
状の転写部材を具えた転写手段と、転写工程後、感光体
上に残留するトナーを除去するクリーニング手段と、静
電潜像を形成するため感光体を帯電させる帯電手段とを
具えた電子写真複写機において、クリーニング手段が回
転する導電性ファーブラシを有し、感光体と導電性ファ
ーブラシとが接触する部位の導電性ファーブラシの回転
方向の上流側に電気的に接地された導電性部材を導電性
ファーブラシに当接させて設け、前記導電性ファーブラ
シが感光体に接触する前に前記導電性部材によって導電
性ファーブラシの帯電電位を放電させるとともに感光体
を摺擦して、クリーニング手段で感光体をクリーニング
することを特徴とする感光体のクリーニング方法。5. A transfer member comprising a photosensitive member, a belt- or roller-shaped transfer member to which a transfer potential is applied by a transfer charging unit having a voltage control unit, and toner remaining on the photosensitive member after the transfer step. In an electrophotographic copying machine having a cleaning means for removing and a charging means for charging the photoconductor to form an electrostatic latent image, the cleaning means has a conductive fur brush, and the photoconductor and the conductive fur brush are rotated. A conductive member, which is electrically grounded, is provided in contact with the conductive fur brush on the upstream side in the rotation direction of the conductive fur brush at the portion in contact with the brush, and the conductive fur brush contacts the photoconductor. Before, the charging potential of the conductive fur brush is discharged by the conductive member, the photosensitive member is rubbed, and the photosensitive member is cleaned by a cleaning unit. How to clean the photoreceptor.
電手段によって転写電位が印加されるベルト又はローラ
状の転写部材を具えた転写手段と、転写工程後、感光体
上に残留するトナーを除去するクリーニング手段と、静
電潜像を形成するため感光体を帯電させる帯電手段と、
トナー供給手段とを具えた電子写真複写機において、前
記転写手段と前記クリーニング手段との間に光照射手段
を設けるとともに、感光体上に形成されたトナー顕像の
反射光を検知して出力し、その出力をトナー供給制御手
段に入力して現像剤のトナー濃度及び補給量を所定量に
維持させる光検知手段を光照射手段の近傍に設け、光照
射手段によって転写手段で感光体に生じた帯電電位を減
衰させる除電光を照射して感光体の帯電電位を減衰させ
た後、クリーニング手段によって感光体をクリーニング
する前記光照射手段が発光する発光エネルギーのピーク
波長が、前記光検知手段の検知感度エネルギーが最大と
なる波長と異なることを特徴とする電子写真複写機。6. A transfer member comprising a photosensitive member, a belt- or roller-shaped transfer member to which a transfer electric potential is applied by a transfer charging unit having a voltage control unit, and toner remaining on the photosensitive member after the transfer step. Cleaning means for removing, charging means for charging the photoreceptor to form an electrostatic latent image,
In an electrophotographic copying machine including a toner supply unit, a light irradiation unit is provided between the transfer unit and the cleaning unit, and the reflected light of the toner image formed on the photoconductor is detected and output. A light detection unit for inputting the output to the toner supply control unit to maintain the toner concentration and the replenishment amount of the developer at a predetermined amount is provided in the vicinity of the light irradiation unit, and the light irradiation unit causes the transfer unit to generate on the photoconductor. The peak wavelength of the emission energy emitted by the light irradiating means for cleaning the photoconductor by the cleaning means after irradiating the charge eliminating light for attenuating the charge potential to attenuate the charge potential of the photoreceptor is detected by the light detecting means. An electrophotographic copying machine characterized in that the sensitivity energy is different from the maximum wavelength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33285493A JP3313219B2 (en) | 1993-12-27 | 1993-12-27 | Photoconductor cleaning method and electrophotographic copying machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33285493A JP3313219B2 (en) | 1993-12-27 | 1993-12-27 | Photoconductor cleaning method and electrophotographic copying machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07191590A true JPH07191590A (en) | 1995-07-28 |
| JP3313219B2 JP3313219B2 (en) | 2002-08-12 |
Family
ID=18259550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33285493A Expired - Fee Related JP3313219B2 (en) | 1993-12-27 | 1993-12-27 | Photoconductor cleaning method and electrophotographic copying machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3313219B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009122497A (en) * | 2007-11-16 | 2009-06-04 | Konica Minolta Business Technologies Inc | Image forming apparatus |
| US9915889B2 (en) | 2015-05-15 | 2018-03-13 | Canon Kabushiki Kaisha | Image forming apparatus |
| US10416594B2 (en) | 2016-10-21 | 2019-09-17 | Ricoh Company, Ltd. | Image forming method, image forming apparatus, and process cartridge |
| JP2020008721A (en) * | 2018-07-09 | 2020-01-16 | キヤノン株式会社 | Cleaning device and image formation apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005114754A (en) | 2003-10-02 | 2005-04-28 | Brother Ind Ltd | Image forming apparatus |
-
1993
- 1993-12-27 JP JP33285493A patent/JP3313219B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009122497A (en) * | 2007-11-16 | 2009-06-04 | Konica Minolta Business Technologies Inc | Image forming apparatus |
| JP4506819B2 (en) * | 2007-11-16 | 2010-07-21 | コニカミノルタビジネステクノロジーズ株式会社 | Image forming apparatus |
| US9915889B2 (en) | 2015-05-15 | 2018-03-13 | Canon Kabushiki Kaisha | Image forming apparatus |
| US10416594B2 (en) | 2016-10-21 | 2019-09-17 | Ricoh Company, Ltd. | Image forming method, image forming apparatus, and process cartridge |
| US10845738B2 (en) | 2016-10-21 | 2020-11-24 | Ricoh Company, Ltd. | Image forming method, image forming apparatus, and process cartridge |
| JP2020008721A (en) * | 2018-07-09 | 2020-01-16 | キヤノン株式会社 | Cleaning device and image formation apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3313219B2 (en) | 2002-08-12 |
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