JPH0643732A - Electrophotographic recorder - Google Patents
Electrophotographic recorderInfo
- Publication number
- JPH0643732A JPH0643732A JP4197109A JP19710992A JPH0643732A JP H0643732 A JPH0643732 A JP H0643732A JP 4197109 A JP4197109 A JP 4197109A JP 19710992 A JP19710992 A JP 19710992A JP H0643732 A JPH0643732 A JP H0643732A
- Authority
- JP
- Japan
- Prior art keywords
- photoconductor
- belt
- roller
- photosensitive body
- driven roller
- 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.)
- Pending
Links
Landscapes
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Fax Reproducing Arrangements (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、ベルト状感光体と帯電
制御用グリッドを有する感光体帯電用コロナ放電器とを
有する電子写真記録装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic recording apparatus having a belt-shaped photoconductor and a photoconductor charging corona discharger having a charge control grid.
【0002】[0002]
【従来の技術】電子写真複写機、ファクシミリ、レーザ
プリンタ等の電子写真記録装置には、感光体としてベル
ト状感光体を使用し、帯電装置として帯電制御グリッド
を備えたコロナ放電器、いわゆるスコロトロンを使用し
たものがよく知られている。2. Description of the Related Art In electrophotographic recording devices such as electrophotographic copying machines, facsimiles and laser printers, a belt-shaped photoconductor is used as a photoconductor and a so-called scorotron, which is a corona discharger having a charge control grid as a charging device, is used. The one used is well known.
【0003】図8は、このような電子写真記録装置の一
例の感光体の近傍の機器の配置を示す図である。3本の
ローラ11に巻き掛けられ、矢印の方向に周動されるベ
ルト状感光体10の周囲には、周動方向の順に、除電用
発光ダイオード12、帯電チャージャ13、露光々線1
9による露光位置、現像器14の現像ローラ24、転写
チャージャ15、クリーニング装置29が配設されてい
る。帯電チャージャ13により均一帯電された感光体1
0に露光々19により形成された静電潜像は、現像器1
4の現像ローラ24により現像されてトナー像とされ、
このトナー像は転写チャージャ15と感光体10との間
に給紙された転写紙20に転写チャージャ15の作用の
もとに転写され、図示しない定着装置で定着されて記録
が完了する。転写後、感光体10上に残留したトナー
は、クリーニング装置29のクリーニングブレード27
により感光体11上より除去され、収納室28に回収さ
れた後、現像剤搬送部32の攪拌部材30で攪拌され、
現像剤搬送部材31により搬送路17を経て現像器14
に送られて再利用される。クリーニング装置29により
残留トナーをクリーニングされた感光体10は、除電用
発光ダイオード12により残留電荷を除去され、初期化
され、繰返し画像記録の用に供せられる。FIG. 8 is a diagram showing the arrangement of devices in the vicinity of a photoconductor as an example of such an electrophotographic recording apparatus. Around the belt-shaped photoconductor 10 which is wound around three rollers 11 and is rotated in the direction of the arrow, the charge-removing light-emitting diode 12, the charger 13, and the exposure line 1 are arranged in the order of the rotating direction.
The exposure position by 9, the developing roller 24 of the developing device 14, the transfer charger 15, and the cleaning device 29 are arranged. Photoreceptor 1 uniformly charged by charging charger 13
The electrostatic latent image formed by the exposure 19 at 0 is the developing device 1
4 is developed by the developing roller 24 to form a toner image,
This toner image is transferred onto the transfer paper 20 fed between the transfer charger 15 and the photoconductor 10 under the action of the transfer charger 15, and is fixed by a fixing device (not shown) to complete the recording. After the transfer, the toner remaining on the photoconductor 10 is cleaned by the cleaning blade 27 of the cleaning device 29.
After being removed from the photoconductor 11 by the above and collected in the storage chamber 28, it is stirred by the stirring member 30 of the developer transport unit 32,
The developer transport member 31 passes through the transport path 17 and the developing device 14
Sent to be reused. The photoconductor 10 whose residual toner has been cleaned by the cleaning device 29 is initialized by removing the residual charges by the light emitting diode 12 for discharging, and is repeatedly used for image recording.
【0004】上記の電子写真記録装置の例では、帯電チ
ャージャ13として帯電制御グリッド13aを、チャー
ジワイヤ13bを囲むシールドケース13cの開口部に
設けたスコロトロンが使用されている。帯電チャージャ
としてスコロトロンを使用する場合、感光体10の表面
電位は制御グリッド13aと感光体10の表面との間隔
に大きく左右される。In the example of the electrophotographic recording apparatus described above, a scorotron having a charging control grid 13a as a charging charger 13 provided in an opening of a shield case 13c surrounding a charge wire 13b is used. When a scorotron is used as the charging charger, the surface potential of the photoconductor 10 largely depends on the distance between the control grid 13a and the surface of the photoconductor 10.
【0005】ところで、感光体ベルトを複数のローラに
巻き掛けて搬送する場合、ローラ11の間では感光体ベ
ルト10は周動方向(副走査方向)と、これに直角の感
光体ベルトの幅方向(主走査方向)の2つの方向にたわ
みが発生するが、上記の帯電チャージャによる感光体表
面電位の変動については主走査方向のたわみが問題にな
る。この問題をさらに具体的に述べると、感光体10の
帯電チャージャ13に対向する位置で、図9に示す如
く、感光体ベルト10が主走査方向に延び感光体ベルト
に直交する面内で両端が下り、中央部が盛上ってグリッ
ド13aに近接しているとすれば、感光体10の表面と
グリッド13aとの正規の間隔(この例では2mm)を中
央部でも両端部でも保つことができなくなる。その結
果、感光体の表面電位の分布も図10に示す如く、主走
査方向の中央部では、正規の表面電位−750Vよりも
大きくなり、両端部では正規の表面電位よりも小さくな
る。When the photoconductor belt is wound around a plurality of rollers and conveyed, the photoconductor belt 10 is rotated between the rollers 11 in the circumferential direction (sub-scanning direction) and in the width direction of the photoconductor belt at right angles thereto. Deflection occurs in two directions (main scanning direction), but the deflection in the main scanning direction becomes a problem with respect to the fluctuation of the photosensitive member surface potential due to the above-mentioned charging charger. To describe this problem more specifically, as shown in FIG. 9, the photosensitive belt 10 extends in the main scanning direction at a position facing the charging charger 13 of the photosensitive member 10, and both ends are in a plane orthogonal to the photosensitive belt. If the central portion rises and the central portion rises and is close to the grid 13a, the regular distance (2 mm in this example) between the surface of the photoconductor 10 and the grid 13a can be maintained at both the central portion and both end portions. Disappear. As a result, as shown in FIG. 10, the distribution of the surface potential of the photoconductor is larger than the regular surface potential of −750 V at the central portion in the main scanning direction, and is smaller than the regular surface potential at both ends.
【0006】このような表面電位の変化は、形成される
画像に対しては両端部と中央部との濃度の変化や、中央
部または両端部の地汚れなどの形態で現れる。さらに、
感光体の劣化も電位の高い部分で促進され、この例の場
合、電位の高い中央部のみが劣化が加速され感光体全体
の寿命が短くなる等の重大な悪影響を及ぼす。Such a change in the surface potential appears in the formed image in the form of a change in the density between the end portions and the central portion and a background stain on the central portion or the both end portions. further,
Deterioration of the photoconductor is also promoted in a portion having a high electric potential, and in this case, deterioration is accelerated only in the central portion having a high electric potential, and the life of the entire photoconductor is shortened.
【0007】[0007]
【発明が解決しようとする課題】本発明は、感光体とし
てベルト状感光体を使用し、帯電チャージャとしてスコ
ロトロンを使用する電子写真記録装置の従来のものの上
記の問題点にかんがみ、簡単な構成でスコロトロン帯電
チャージャのグリッドとベルト状感光体の表面との間隔
を主走査方向に均等にすることができる手段を備えた電
子写真記録装置を提供することを課題とする。SUMMARY OF THE INVENTION The present invention has a simple structure in view of the above problems of the conventional electrophotographic recording apparatus using a belt-shaped photoreceptor as a photoreceptor and a scorotron as a charger. An object of the present invention is to provide an electrophotographic recording apparatus provided with means capable of making the distance between the grid of the scorotron charging charger and the surface of the belt-shaped photosensitive member uniform in the main scanning direction.
【0008】[0008]
【課題を解決するための手段】本発明は、上記の課題を
解決するため、複数のローラに掛け渡されて周動するベ
ルト状感光体と、その外周面に対向し、帯電制御グリッ
ドを有する感光体帯電用コロナ放電器を有する電子写真
記録装置において、ベルト状感光体の裏面で上記のコロ
ナ放電器の帯電制御グリッドに対向する位置に感光体全
幅に亘って接触する従動ローラを設けたことを特徴とす
る。In order to solve the above-mentioned problems, the present invention has a belt-shaped photosensitive member which is wound around a plurality of rollers and circulates, and a charging control grid which faces the outer peripheral surface thereof. In an electrophotographic recording apparatus having a corona discharger for charging a photoconductor, a driven roller which is in contact with the entire width of the photoconductor is provided at a position facing the charging control grid of the corona discharger on the back surface of the belt-shaped photoconductor. Is characterized by.
【0009】感光体の基体を磁性金属で形成し、上記の
従動ローラとして磁化されたローラを使用してもよい。It is also possible to use a magnetized roller as the driven roller, in which the base of the photoreceptor is made of magnetic metal.
【0010】感光体の基体を磁性金属で形成した場合、
従動ローラとしての磁化ローラは感光体表面の、コロナ
放電器に隣接する位置に設けてもよい。When the substrate of the photoreceptor is made of magnetic metal,
The magnetizing roller as a driven roller may be provided on the surface of the photoconductor at a position adjacent to the corona discharger.
【0011】[0011]
【作用】上記の第1の構成によれば、コロナ放電器に対
向する位置で従動ローラをベルト状感光体に全幅に亘っ
て接触するように設けたので、ベルト状感光体は従動ロ
ーラに密接して一直線となりコロナ放電器のグリッドと
の間隔は全幅に亘って均等になる。According to the first structure, the driven roller is provided so as to contact the belt-shaped photosensitive member over the entire width at the position facing the corona discharger. Therefore, the belt-shaped photosensitive member is in close contact with the driven roller. Then, it becomes a straight line, and the distance from the grid of the corona discharger becomes uniform over the entire width.
【0012】上記の第2の構成のように従動ローラを磁
化ローラとし感光体の基体を磁性金属とすれば、感光体
は全幅に亘って従動ローラに磁気吸着されるので、作用
は一層確実になる。If the driven roller is a magnetizing roller and the base of the photoconductor is magnetic metal as in the second structure, the photoconductor is magnetically attracted to the driven roller over the entire width, so that the operation is more reliable. Become.
【0013】第3の構成のように従動ローラを磁化され
たローラとする場合はベルト状感光体の表面に接して帯
電チャージャに隣接して設けても、感光体表面を全幅に
亘ってグリッドと一定の間隔に保持することができる。When the driven roller is a magnetized roller as in the third configuration, even if the driven roller is provided in contact with the surface of the belt-shaped photoconductor and adjacent to the charger, the photoconductor surface is formed into a grid over the entire width. It can be held at regular intervals.
【0014】[0014]
【実施例】以下に本発明の実施例を、図面に基づいて詳
細に説明する。Embodiments of the present invention will be described below in detail with reference to the drawings.
【0015】図1は、本発明を図8で説明した電子写真
記録装置に適用した実施例の感光体ベルト10とスコロ
トロン帯電チャージャ13の近傍を示す図である。感光
体10の裏面の帯電チャージャ13に対向する位置に
は、感光体10の全幅に亘って従動ローラ50が設けら
れている。従動ローラ50を感光体の全幅に亘って接触
させるには、図2に示す如く、従動ローラ50をある程
度感光ベルトに食い込ませて設けるようにすれば一そう
確実になる。FIG. 1 is a diagram showing the vicinity of a photosensitive belt 10 and a scorotron charger 13 of the embodiment in which the present invention is applied to the electrophotographic recording apparatus described in FIG. A driven roller 50 is provided over the entire width of the photoconductor 10 at a position on the back surface of the photoconductor 10 that faces the charger 13. In order to bring the driven roller 50 into contact with the entire width of the photosensitive member, it is more reliable if the driven roller 50 is provided so as to bite into the photosensitive belt to some extent as shown in FIG.
【0016】もし、ベルト状感光体10の基体がニッケ
ル等の磁性金属で作られている場合は、従動ローラ52
は図3に示すように、磁化されたローラとすれば、従動
ローラ52を感光体10に食い込ませなくてもベルト状
感光体10は確実に全長に亘って吸着され、帯電チャー
ジャ13のグリッドと感光体表面との間隔を確実に正規
の値に均一に保持することができる。If the base of the belt-shaped photosensitive member 10 is made of a magnetic metal such as nickel, the driven roller 52 is used.
As shown in FIG. 3, if the magnetized roller is used, the belt-shaped photosensitive member 10 can be securely attracted over the entire length without the driven roller 52 biting into the photosensitive member 10, and the belt of the charger 13 can be formed. The distance from the surface of the photoconductor can be reliably maintained at a regular value.
【0017】又、感光体ベルト10の基体がニッケル等
の磁性金属で作られる場合は、図4に示す如く、従動ロ
ーラとしての磁化されたローラ55を感光体ベルト10
の表面の帯電チャージャ13に隣接する位置で設け、感
光体ベルト10を従動ローラ55に吸着させることによ
っても、感光体ベルト10の表面と帯電チャージャ13
のグリッド13aとの間隔を均一に保持することができ
る。When the base of the photosensitive belt 10 is made of a magnetic metal such as nickel, the magnetized roller 55 as a driven roller is replaced with a magnetized roller 55 as shown in FIG.
The surface of the photoconductor belt 10 and the charger 13 can be arranged by adjoining the photoconductor belt 10 to the driven roller 55.
It is possible to maintain a uniform distance from the grid 13a.
【0018】なお、図1又は図2に示す感光体裏面に接
し、帯電チャージャに対向して設ける従動ローラ50の
代りに、図5に示す如く、感光体10の裏面で帯電チャ
ージャに対向する位置で感光体10の全幅に亘って接触
する摺動部材53を設けてもよい。摺動部材53は感光
体ベルトユニットの両側板に両端を固定された金属等の
ステーとするのがよい。この金属ステーは露光部の対向
板としてよく採用されているものと同様の図6に示すよ
うな形状とすればよい。Incidentally, instead of the driven roller 50 provided in contact with the back surface of the photoconductor shown in FIG. 1 or 2 so as to face the charging charger, as shown in FIG. 5, the position on the back surface of the photoconductor 10 facing the charging charger. Therefore, a sliding member 53 may be provided that contacts the entire width of the photoconductor 10. The sliding member 53 is preferably a stay made of metal or the like, both ends of which are fixed to both side plates of the photosensitive belt unit. This metal stay may have a shape as shown in FIG. 6, which is similar to that which is often used as a counter plate of the exposure section.
【0019】又、感光体ベルトの基体が金属である場
合、上記の金属ステーとの間の摩擦で感光体に塑性変形
が発生し、波打ちと呼ばれる現象が発生する不具合があ
る。これを防止するため、図7に示す如く、金属ステー
53のベルト感光体10の基体と摺接する面に摩擦係数
の小さい材料のコーティング54を施すのがよい。When the base of the photoconductor belt is made of metal, friction between the metal belt and the metal stay causes plastic deformation of the photoconductor, which causes a phenomenon called corrugation. In order to prevent this, as shown in FIG. 7, it is preferable to apply a coating 54 of a material having a small friction coefficient to the surface of the metal stay 53 that is in sliding contact with the base of the belt photoreceptor 10.
【0020】[0020]
【発明の効果】以上の如く、本発明によれば、感光体ベ
ルトの表面とスコロトロンとして形成された帯電チャー
ジュのグリッドとの間隔を感光体の全幅に亘って正規の
値に均一に保持することができるので、感光体の表面電
位を全幅に亘って正規の値に保持することができ、画像
の地汚れの防止、感光体の劣化の促進の防止に効果が得
られる。As described above, according to the present invention, the distance between the surface of the photoconductor belt and the grid of the charging charge formed as a scorotron is uniformly maintained at a regular value over the entire width of the photoconductor. Therefore, the surface potential of the photoconductor can be maintained at a regular value over the entire width, and the effect of preventing background stain of an image and promotion of deterioration of the photoconductor can be obtained.
【図1】本発明の実施例の電子写真記録装置の感光体と
帯電器の近傍を示す断面図である。FIG. 1 is a cross-sectional view showing the vicinity of a photoconductor and a charger of an electrophotographic recording apparatus according to an exemplary embodiment of the present invention.
【図2】その感光体と従動ローラとの接触状態の一例を
示す断面図である。FIG. 2 is a cross-sectional view showing an example of a contact state between the photoconductor and a driven roller.
【図3】その感光体に磁性基体を用い従動ローラに磁化
ローラを用いた場合の感光体と従動ローラとの接触状態
の一例を示す断面図である。FIG. 3 is a cross-sectional view showing an example of a contact state between a photoconductor and a driven roller when a magnetic substrate is used as the photoconductor and a magnetizing roller is used as the driven roller.
【図4】本発明の他の実施例の感光体と帯電チャージャ
近傍の断面図である。FIG. 4 is a cross-sectional view of a photosensitive member according to another embodiment of the present invention and the vicinity of the charger.
【図5】従動ローラの代りに摺接部材を使用した例を示
す断面図である。FIG. 5 is a cross-sectional view showing an example in which a sliding contact member is used instead of a driven roller.
【図6】その摺動部材の形状を示す斜視図である。FIG. 6 is a perspective view showing the shape of the sliding member.
【図7】その摺動部材の表面に低摩擦材料のコーティン
グを施した状態を示す斜視図である。FIG. 7 is a perspective view showing a state in which the surface of the sliding member is coated with a low friction material.
【図8】従来の電子写真記録装置の一例の感光体の近傍
の機器の配置を示す説明図である。FIG. 8 is an explanatory diagram showing an arrangement of devices near a photoconductor of an example of a conventional electrophotographic recording apparatus.
【図9】図10とともにその問題点を説明する説明図で
ある。9 is an explanatory diagram for explaining the problem with FIG.
【図10】図9とともにその問題点を説明する説明図で
ある。10 is an explanatory diagram for explaining the problem with FIG. 9. FIG.
10 ベルト状感光体 11 ローラ 13 スコロトロン帯電器(感光体帯電用コロナ放電
器) 13a 帯電制御グリッド 50 従動ローラ 52,55 磁化された従動ローラ10 Belt-shaped Photoreceptor 11 Roller 13 Scorotron Charger (Corona Discharger for Photoreceptor Charging) 13a Charge Control Grid 50 Driven Rollers 52, 55 Magnetized Driven Rollers
Claims (3)
ルト状感光体と、その外周面に対向し帯電制御グリッド
を有する感光体帯電用コロナ放電器とを有する電子写真
記録装置において、 上記のベルト状感光体の裏面で上記のコロナ放電器の帯
電制御グリッドに対向する位置に、感光体全幅に亘って
接触する従動ローラを設けたことを特徴とする電子写真
記録装置。1. An electrophotographic recording apparatus comprising: a belt-shaped photosensitive member which is wound around a plurality of rollers and circulates; and a corona discharger for charging the photosensitive member which has a charge control grid facing the outer peripheral surface thereof. An electrophotographic recording apparatus comprising a driven roller which is in contact with the charging control grid of the corona discharger on the back surface of the belt-shaped photoconductor and is in contact with the entire width of the photoconductor.
れ、上記の従動ローラとして磁化されたローラを用いた
ことを特徴とする請求項1に記載の電子写真記録装置。2. The electrophotographic recording apparatus according to claim 1, wherein the base body of the photoconductor is made of magnetic metal, and a magnetized roller is used as the driven roller.
体として磁性金属を用いたベルト状感光体と、その外周
面に対向し、帯電制御グリッドを有する感光体帯電用コ
ロナ放電器とを有する電子写真記録装置において、 上記のベルト状感光体表面の上記のコロナ放電器に隣接
する位置に感光体の全幅に亘り磁化された従動ローラを
設けたことを特徴とする電子写真記録装置。3. A belt-shaped photoconductor that is wound around a plurality of rollers and circulates, and uses a magnetic metal as a substrate, and a corona discharger for charging the photoconductor that has a charge control grid that faces the outer peripheral surface thereof. An electrophotographic recording apparatus having a driven roller magnetized over the entire width of the photoconductor at a position adjacent to the corona discharger on the surface of the belt-shaped photoconductor.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4197109A JPH0643732A (en) | 1992-07-23 | 1992-07-23 | Electrophotographic recorder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4197109A JPH0643732A (en) | 1992-07-23 | 1992-07-23 | Electrophotographic recorder |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0643732A true JPH0643732A (en) | 1994-02-18 |
Family
ID=16368885
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4197109A Pending JPH0643732A (en) | 1992-07-23 | 1992-07-23 | Electrophotographic recorder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0643732A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5915149A (en) * | 1997-06-25 | 1999-06-22 | Xerox Corporation | Magnetic ball-on-belt transport |
-
1992
- 1992-07-23 JP JP4197109A patent/JPH0643732A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5915149A (en) * | 1997-06-25 | 1999-06-22 | Xerox Corporation | Magnetic ball-on-belt transport |
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