JPH063935A - Electrophotographic device - Google Patents
Electrophotographic deviceInfo
- Publication number
- JPH063935A JPH063935A JP4183146A JP18314692A JPH063935A JP H063935 A JPH063935 A JP H063935A JP 4183146 A JP4183146 A JP 4183146A JP 18314692 A JP18314692 A JP 18314692A JP H063935 A JPH063935 A JP H063935A
- Authority
- JP
- Japan
- Prior art keywords
- photoconductor
- developing roller
- photosensitive member
- rotated
- image
- 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
- Dry Development In Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、レーザプリンタ・レ
ーザ複写機・レーザファクシミリなど、電子写真方式
（感光体に形成した画像を用紙や封筒などのシートに転
写して記録を行う方式）によってシートに記録を行う電
子写真装置に関する。すなわち、感光体を回転して帯電
後書込みを行ってその感光体上に静電潜像を形成し、現
像ロ−ラでトナーを付着しその潜像を現像して該感光体
上に画像を形成し、その画像を転写してシートに記録を
行う電子写真装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet such as a laser printer, a laser copying machine, a laser facsimile, etc., by an electrophotographic system (a system for transferring an image formed on a photoconductor to a sheet such as paper or envelope for recording). The present invention relates to an electrophotographic apparatus that records on a computer. That is, the photosensitive member is rotated to perform writing after charging, an electrostatic latent image is formed on the photosensitive member, toner is attached by a developing roller, the latent image is developed, and an image is formed on the photosensitive member. The present invention relates to an electrophotographic apparatus that forms an image, transfers the image, and records the image on a sheet.
【０００２】[0002]
【従来の技術】従来、この種の電子写真装置、たとえば
レーザプリンタでは、感光体に現像ロ−ラを接触して設
けるとともに、図６に示すように該感光体の周速Ｖｐを
Ｖ1として回転すると同時に現像ロ−ラの周速Ｖｄを感
光体より速いＶ2として回転し、該現像ロ−ラで擦って
感光体上にトナーを静電的に付着し、感光体表面の静電
潜像を現像していた。2. Description of the Related Art Conventionally, in this type of electrophotographic apparatus, for example, a laser printer, a developing roller is provided in contact with a photosensitive member, and the peripheral speed Vp of the photosensitive member is set to V 1 as shown in FIG. Simultaneously with the rotation, the peripheral speed Vd of the developing roller is set to V 2 which is faster than that of the photosensitive member, and the developing roller is rubbed to electrostatically attach the toner to the photosensitive member. The image was being developed.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
この種のレーザプリンタでは、感光体１の回転始めから
回転終わりまで該感光体１の表面を現像ロ−ラ２で擦る
ので、感光体１の表面が摩耗してその寿命が短くなる問
題があった。そこで、この発明の目的は、感光体の回転
中における感光体表面と現像ロ−ラの擦れを低減して感
光体の寿命を長くすることにある。However, in the conventional laser printer of this type, since the surface of the photoconductor 1 is rubbed by the developing roller 2 from the start to the end of the rotation of the photoconductor 1, the photoconductor 1 is rubbed. There is a problem that the surface is worn and its life is shortened. Therefore, an object of the present invention is to reduce the friction between the surface of the photoconductor and the developing roller during the rotation of the photoconductor to prolong the life of the photoconductor.
【０００４】[0004]
【課題を解決するための手段】そのため、請求項１に記
載の発明は、たとえば以下の図示実施例に示すとおり、
感光体１１を回転して帯電後書込みを行ってその感光体
１１上に静電潜像を形成し、現像ロ−ラ２６でトナーを
付着してその潜像を現像して該感光体１１上に画像を形
成し、その画像を転写してシート１７に記録を行う電子
写真装置において、前記静電潜像の現像タイミングに合
わせて前記現像ロ−ラ２６を前記感光体１１より速い周
速で回転し、その他の前記感光体１１の回転期間中は前
記現像ロ−ラ２６を前記感光体１１とほぼ同じ周速で回
転してなることを特徴とする。Therefore, the invention described in claim 1 is, for example, as shown in the following illustrated embodiments,
The photoconductor 11 is rotated to perform writing after charging, to form an electrostatic latent image on the photoconductor 11, and the toner is attached by the developing roller 26 to develop the latent image on the photoconductor 11. In an electrophotographic apparatus for forming an image on a sheet and transferring the image to record on the sheet 17, the developing roller 26 is rotated at a peripheral speed higher than that of the photoconductor 11 in synchronization with the developing timing of the electrostatic latent image. It is characterized in that the developing roller 26 is rotated at the same peripheral speed as that of the photoconductor 11 during the other rotation period of the photoconductor 11.
【０００５】請求項２に記載の発明は、たとえば以下の
図示実施例に示すとおり、感光体１１を回転して帯電後
書込みを行ってその感光体１１上に静電潜像を形成し、
現像ロ−ラ２６でトナーを付着してその潜像を現像して
該感光体１１上に画像を形成し、その画像を転写してシ
ート１７に記録を行う電子写真装置において、前記現像
ロ−ラ２６と前記感光体１１とを、前記静電潜像の現像
タイミングに合わせて接触状態とし、その他の前記感光
体１１の回転期間中は非接触状態としてなることを特徴
とする。According to a second aspect of the present invention, for example, as shown in the following illustrated embodiment, the photosensitive member 11 is rotated to perform writing after charging to form an electrostatic latent image on the photosensitive member 11.
In the electrophotographic apparatus for adhering toner by the developing roller 26 to develop the latent image to form an image on the photoconductor 11 and transfer the image to record on the sheet 17, the developing roller It is characterized in that the laser 26 and the photoconductor 11 are brought into contact with each other in accordance with the development timing of the electrostatic latent image, and are kept in non-contact with each other during the rotation period of the photoconductor 11.
【０００６】[0006]
【作用】そして、請求項１に記載の発明では、感光体１
１の回転中、現像タイミングに合わせて現像ロ−ラ２６
を感光体１１より速い周速で回転する一方、その他の感
光体１１の回転期間中は感光体１１と現像ロ−ラ２６の
相対速度をほぼゼロにする。In the invention described in claim 1, the photosensitive member 1
During the rotation of 1, the development roller 26 is synchronized with the development timing.
While rotating at a peripheral speed higher than that of the photoconductor 11, the relative speed between the photoconductor 11 and the developing roller 26 is made substantially zero during the rotation period of the other photoconductors 11.
【０００７】請求項２に記載の発明では、感光体１１の
回転中、現像タイミングに合わせて現像ロ−ラ２６を感
光体１１に接触状態とする一方、その他の感光体１１の
回転期間中は現像ロ−ラ２６と感光体１１とを非接触状
態とする。According to the second aspect of the invention, while the photosensitive member 11 is rotating, the developing roller 26 is brought into contact with the photosensitive member 11 at the development timing, while the other photosensitive member 11 is rotating. The developing roller 26 and the photoconductor 11 are brought into non-contact with each other.
【０００８】[0008]
【実施例】以下、図面を参照しつつ、この発明の実施例
を詳細に説明する。図５には、この発明の一実施例であ
るレーザプリンタの内部機構の全体概略構成を示す。Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 5 shows an overall schematic configuration of an internal mechanism of a laser printer which is an embodiment of the present invention.
【０００９】図中符号１０で示すものは、装置本体であ
る。該装置本体１０内には、中央に、ベルト状の感光体
１１を設ける。そして、その感光体１１のまわりには、
回転方向（図中時計方向）に順に、帯電チャージャ１２
・レーザ光学系１３・現像器１４・転写チャージャ１５
・クリーニング器１６を配置する。この装置本体１０の
図中右側には、シート１７を収納する給紙トレイ１８を
着脱自在に装填する。そして、その給紙トレイ１８の取
付部には、給紙ローラ１９や紙ガイド板２０などを有す
る給紙部２１を設ける。他方、前述の転写チャージャ１
５をはさんで該給紙部２１と反対の側には、搬送ガイド
２２・定着器２３などを順に並べて配する。また、装置
本体１０の上面には、排出するシート１７を受ける排紙
受け２４を設けてなる。Reference numeral 10 in the figure denotes the apparatus main body. A belt-shaped photoreceptor 11 is provided in the center of the apparatus main body 10. Then, around the photoconductor 11,
In the rotation direction (clockwise direction in the figure), the charger 12
・ Laser optical system 13 ・ Developer 14 ・ Transfer charger 15
-Place the cleaning device 16. A paper feed tray 18 for accommodating sheets 17 is detachably loaded on the right side of the apparatus main body 10 in the figure. Then, a paper feed section 21 having a paper feed roller 19 and a paper guide plate 20 is provided at the mounting portion of the paper feed tray 18. On the other hand, the transfer charger 1 described above
On the side opposite to the paper feeding section 21 with 5 in between, a conveyance guide 22 and a fixing device 23 are arranged side by side. Further, on the upper surface of the apparatus main body 10, a paper discharge tray 24 for receiving the discharged sheet 17 is provided.
【００１０】しかして、いま該レーザプリンタを用いて
電子写真プロセスによる記録を行うときは、駆動源から
駆動力を伝えて給紙ローラ１９を駆動し、給紙トレイ１
８内からシート１７を送り出す。そして、紙ガイド板２
０で案内して搬送し、やがて図示しないレジストセンサ
でシート１７の先端を検知する。しかして、そのシート
１７の先端を、レジストローラ対２５に突き当て止め
る。However, when recording is to be performed by the electrophotographic process using the laser printer, the driving force is transmitted from the driving source to drive the sheet feeding roller 19 and the sheet feeding tray 1
The sheet 17 is sent out from within 8. And the paper guide plate 2
The sheet is guided and conveyed at 0, and then the leading edge of the sheet 17 is detected by a registration sensor (not shown). Then, the leading end of the sheet 17 is abutted against the registration roller pair 25 and stopped.
【００１１】他方、感光体１１は、駆動源からの駆動力
により図中時計方向に回転しながら帯電チャージャ１２
でその表面を順次一様に帯電し、次のレーザ光学系１３
からレーザ光を照射してその表面に静電潜像を形成し、
続いて現像器１４を通るときその現像ロ−ラ２６でトナ
ーを付着して静電潜像を逐時可視像化する。そして、そ
の可視像とタイミングを合わせ、前述のレジストローラ
対２５に突き当てていたシート１７を感光体１１に向け
て送り出す。しかして、その感光体１１上の像を転写チ
ャージャ１５で該シート１７に転写する。On the other hand, the photoconductor 11 rotates in the clockwise direction in the figure by the driving force from the driving source, and the charging charger 12
The surface is sequentially charged uniformly by the
To irradiate a laser beam from it to form an electrostatic latent image on its surface,
Then, when the toner passes through the developing device 14, toner is attached by the developing roller 26 to make the electrostatic latent image a visible image every moment. Then, in synchronization with the visible image, the sheet 17 abutting against the registration roller pair 25 is sent out toward the photoconductor 11. Then, the image on the photoconductor 11 is transferred to the sheet 17 by the transfer charger 15.
【００１２】画像転写後、感光体１１上の残留トナー
は、クリーニング器１６で掻き落し、該クリーニング器
１６で感光体１１表面上を清掃する。After the image transfer, the residual toner on the photoconductor 11 is scraped off by the cleaning device 16, and the surface of the photoconductor 11 is cleaned by the cleaning device 16.
【００１３】一方、シート１７は、搬送ガイド２２によ
って定着器２３へと送り、転写した像をその定着器２３
で熱定着する。定着後、シート１７は、装置本体１０か
ら排出し、排紙受け２４上に順次スタックする。On the other hand, the sheet 17 is sent to the fixing device 23 by the conveyance guide 22, and the transferred image is fixed to the fixing device 23.
Fix with heat. After fixing, the sheets 17 are discharged from the apparatus main body 10 and sequentially stacked on the paper discharge tray 24.
【００１４】さて、請求項１に記載の発明は、図１に示
すように、前記感光体１１上の静電潜像の現像タイミン
グ、すなわち図中符号ｔ4からｔ5までの間に合わせて、
前記現像ロ−ラ２６を前記感光体１１より速い周速（現
像ロ−ラの周速Ｖｄ＞感光体の周速Ｖｐ）で回転し、そ
の他の前記感光体１１の回転期間中、すなわち図中符号
ｔ2からｔ3までの回転期間中及びｔ6からｔ7までの回転
期間中、は前記現像ロ−ラ２６を前記感光体１１とほぼ
同じ周速で回転する構成とする。According to the first aspect of the present invention, as shown in FIG. 1, according to the development timing of the electrostatic latent image on the photoconductor 11, that is, in the period from t 4 to t 5 in the figure,
The developing roller 26 is rotated at a peripheral speed higher than that of the photoconductor 11 (the peripheral speed Vd of the developing roller> the peripheral speed Vp of the photoconductor), and during the other rotation period of the photoconductor 11, that is, in the figure. during rotation period from rotating during the period and t 6 from the code t 2 to t 3 to t 7, the said developing b - a structure that rotates at approximately the same peripheral speed as the La 26 the photosensitive member 11.
【００１５】しかして、電源をオンして後、経時記録を
行うときは、図示するように、感光体１１の周速Ｖｐを
ｖ1として書き込みを行う。前記感光体１１の回転中、
現像ロ−ラ２６は、たとえば前記感光体１１の書き込み
部分が現像位置となるまでの間、図中ｔ3までの回転期
間中は、該感光体１１とほぼ同じ周速ｖ1で回転する。
そして、感光体１１と現像ロ−ラ２６の相対速度をほぼ
ゼロにする。その後、現像タイミングに合わせて、符号
ｔ4からｔ5までの回転期間中は、現像ロ−ラ２６の周速
Ｖｄを感光体１１より速いｖ2とし、該現像ロ−ラ２６
で擦ってトナーを付着し感光体１１上の静電潜像を現像
する。その現像終了後、ｔ8までの回転期間中は、再び
感光体１１と現像ロ−ラ２６の相対速度をほぼゼロにす
る。However, when recording with time after the power is turned on, as shown in the drawing, writing is performed with the peripheral speed Vp of the photoconductor 11 as v 1 . While the photoconductor 11 is rotating,
The developing roller 26 rotates at substantially the same peripheral speed v 1 as that of the photoconductor 11 until the writing portion of the photoconductor 11 reaches the developing position, for example, during a rotation period up to t 3 in the drawing.
Then, the relative speed between the photoconductor 11 and the developing roller 26 is made substantially zero. Thereafter, in accordance with the development timing, the peripheral speed Vd of the developing roller 26 is set to v 2 faster than the photoconductor 11 during the rotation period from t 4 to t 5 , and the developing roller 26 is rotated.
Rubbing with, toner is attached and the electrostatic latent image on the photoconductor 11 is developed. After the completion of the development, the relative speed between the photoconductor 11 and the developing roller 26 is made substantially zero again during the rotation period up to t 8 .
【００１６】なお、上述した実施例では、現像タイミン
グを除く感光体１１の回転期間中、現像ロ−ラ２６を前
記感光体１１とほぼ同じ周速で回転する構成として感光
体１１表面と現像ロ−ラ２６の擦れを低減した。しか
し、請求項２に記載の発明では、図２乃至図４に示す実
施例のように、現像タイミングを除く感光体１１の回転
期間中、感光体１１と現像ロ−ラ２６を非接触状態とし
て感光体１１表面と現像ロ−ラ２６の擦れを低減する構
成とする。In the embodiment described above, the developing roller 26 is rotated at substantially the same peripheral speed as the photosensitive member 11 during the rotation period of the photosensitive member 11 excluding the developing timing, and the surface of the photosensitive member 11 and the developing roller 11 are rotated. -Rubber 26 was reduced. However, according to the second aspect of the invention, as in the embodiment shown in FIGS. 2 to 4, during the rotation period of the photoconductor 11 excluding the development timing, the photoconductor 11 and the developing roller 26 are brought into a non-contact state. It is configured to reduce the friction between the surface of the photoconductor 11 and the developing roller 26.
【００１７】すなわち、図２中符号３０は、感光体１１
のベルト２９を回転駆動する駆動ロ−ラで、ロ−ラ軸３
１を軸受３２で回転自在に支持してなる。該駆動ロ−ラ
３０のロ−ラ軸３１には、図示しないベルトを介して駆
動源からの駆動力を伝達する。前記駆動ロ−ラ３０のロ
−ラ軸３１には、カム３３を押し当ててなる。該カム３
３は、装置本体１０内に適宜支持して回転自在とする。That is, reference numeral 30 in FIG.
Of the roller shaft 3 by the drive roller that rotationally drives the belt 29 of
1 is rotatably supported by a bearing 32. A driving force from a driving source is transmitted to a roller shaft 31 of the driving roller 30 via a belt (not shown). A cam 33 is pressed against the roller shaft 31 of the drive roller 30. The cam 3
Reference numeral 3 is appropriately supported in the apparatus main body 10 and is rotatable.
【００１８】しかして、現像タイミングを除く感光体１
１の回転期間中は、前記カム３３を回転し、該カム３３
で感光体１１のロ−ラ軸３１を押し上げる。すると、駆
動ロ−ラ３０側の感光体１１のベルト２９が図中二転鎖
線位置へと移動し、該ベルト２９と現像ロ−ラ２６間に
所定のギャップδを形成し、それら感光体１１と現像ロ
−ラ２６が非接触状態となる。Therefore, the photosensitive member 1 excluding the developing timing
During one rotation period, the cam 33 is rotated and the cam 33 is rotated.
Then, the roller shaft 31 of the photoconductor 11 is pushed up. Then, the belt 29 of the photoconductor 11 on the side of the driving roller 30 moves to the position of the chain double-dashed line in the figure, and a predetermined gap δ is formed between the belt 29 and the developing roller 26. And the developing roller 26 is brought into a non-contact state.
【００１９】また、図３に示す他の例では、現像ロ−ラ
２６の両端にカム３６を回転自在に設ける。該カム３６
には、駆動源からの駆動力を図示しないクラッチを介し
て後、分岐して伝達する。Further, in another example shown in FIG. 3, cams 36 are rotatably provided at both ends of the developing roller 26. The cam 36
The drive force from the drive source is branched to and transmitted to the drive unit via a clutch (not shown).
【００２０】しかして、現像タイミングを除く感光体の
回転期間中は、前記カム３６を回転する。すると、該カ
ム３６が一点鎖線位置に移動して感光体１１のベルト２
９を押し上げる。そして、該感光体１１のベルト２９と
現像ロ−ラ２６間に所定のギャップδを形成し、それら
感光体１１と現像ロ−ラ２６が非接触状態となる。The cam 36 is rotated during the rotation period of the photoconductor except the developing timing. Then, the cam 36 moves to the position indicated by the alternate long and short dash line to move the belt 2 of the photoconductor 11
Push up 9. Then, a predetermined gap δ is formed between the belt 29 of the photoconductor 11 and the developing roller 26, and the photoconductor 11 and the developing roller 26 are brought into a non-contact state.
【００２１】さらに、図４に示す他の例では、装置本体
１０内に前記現像器１４を図中左右方向に移動自在に設
ける。前記現像器１４は、側板１４ａにピン１４ｂを突
出し、該ピン１４ｂをレバー４０の一端部の長孔４０ａ
に挿入して設ける。前記レバー４０は、装置本体１０内
に軸４１を支点として回動自在に設ける。該レバー４０
の他端部には、長孔４０ｂを設けるとともに、引張コイ
ルバネ４２の一端を掛け止めてなる。該引張コイルバネ
４２の他端は、装置本体１０内の適宜位置に掛け止めて
なる。また、前記レバー４０の他端部の長孔４０ｂに
は、ピン４４ａを挿入して設ける。前記ピン４４ａは、
ソレノイド４３の移動棒４４の先端に設ける。前記ソレ
ノイド４３は、装置本体１０内に適宜固定してなる。Further, in another example shown in FIG. 4, the developing device 14 is provided in the apparatus main body 10 so as to be movable in the left-right direction in the drawing. In the developing device 14, a pin 14b is projected on the side plate 14a, and the pin 14b is formed in the long hole 40a at one end of the lever 40.
It is installed by inserting into. The lever 40 is rotatably provided in the apparatus body 10 with a shaft 41 as a fulcrum. The lever 40
An elongated hole 40b is provided at the other end of the tension coil spring 42 and one end of the tension coil spring 42 is hooked. The other end of the tension coil spring 42 is hooked at an appropriate position in the apparatus body 10. Further, a pin 44a is inserted and provided in the long hole 40b at the other end of the lever 40. The pin 44a is
It is provided at the tip of the moving rod 44 of the solenoid 43. The solenoid 43 is appropriately fixed in the apparatus body 10.
【００２２】しかして、現像タイミングに合わせて前記
ソレノイド４３をオンすると、レバー４０を反時計方向
へ回動して現像器１４を図中右へ付勢して図示するごと
く現像ロ−ラ２６を感光体１１のベルト２９に押し当て
る。そして、現像ロ−ラ２６を感光体１１より速い周速
で回転して感光体上の静電潜像を現像する。一方、装置
本体１０が電源オフのときあるいは現像タイミングを除
くその他の感光体１１の回転期間中は、前記ソレノイド
４３をオフにする。すると、前記コイルバネ４２で前記
レバー４０を軸４１を中心に時計方向に回動し、前記レ
バー４０で前記現像器１４を図中二転鎖線位置へと移動
する。そして、感光体１１のベルト２９と現像ロ−ラ２
６間に所定のギャップδを形成し、それら感光体１１と
現像ロ−ラ２６とを非接触状態とする。When the solenoid 43 is turned on at the development timing, the lever 40 is rotated in the counterclockwise direction to urge the developing device 14 to the right in the drawing to move the developing roller 26 as shown in the drawing. The belt 29 of the photoconductor 11 is pressed. Then, the developing roller 26 is rotated at a peripheral speed higher than that of the photoconductor 11 to develop the electrostatic latent image on the photoconductor. On the other hand, the solenoid 43 is turned off when the power source of the apparatus main body 10 is off or during the rotation period of the photoconductor 11 other than the developing timing. Then, the coil spring 42 rotates the lever 40 clockwise about the shaft 41, and the lever 40 moves the developing device 14 to the position indicated by the double-dot chain line in the figure. Then, the belt 29 of the photoconductor 11 and the developing roller 2
A predetermined gap .delta. Is formed between the photoconductors 6 to bring the photoconductor 11 and the developing roller 26 out of contact with each other.
【００２３】[0023]
【発明の効果】したがって、請求項１に記載の発明によ
れば、現像タイミングに合わせて現像ロ−ラを感光体よ
り速い周速で回転する一方、その他の感光体の回転期間
中は現像ロ−ラと感光体の相対速度をほぼゼロとするの
で、また、請求項２に記載の発明によれば、現像タイミ
ングに合わせて現像ロ−ラを感光体に接触状態とする一
方、その他の感光体の回転期間中は現像ロ−ラと感光体
とを非接触状態とするので、感光体の回転中、感光体表
面と現像ロ−ラの擦れの時間を短くすることができ、感
光体表面の摩耗を低減して感光体の寿命を長くすること
ができる。Therefore, according to the first aspect of the present invention, the developing roller is rotated at a peripheral speed higher than that of the photosensitive member in accordance with the developing timing, while the developing roller is rotated during the rotation period of other photosensitive members. -Since the relative speed between the roller and the photoconductor is substantially zero, according to the second aspect of the invention, the developing roller is brought into contact with the photoconductor at the development timing, while the other photoconductors are exposed. Since the developing roller and the photoconductor are not in contact with each other during the rotation of the body, the time of rubbing between the surface of the photoconductor and the developing roller can be shortened during the rotation of the photoconductor. The wear of the photosensitive member can be reduced and the life of the photosensitive member can be extended.
【図１】請求項１に記載の発明の一実施例であるレーザ
プリンタの感光体の回転中における感光体と現像ロ−ラ
の周速の関係図である。FIG. 1 is a diagram showing the relationship between the peripheral speeds of a photoconductor and a developing roller during rotation of the photoconductor of a laser printer according to an embodiment of the present invention.
【図２】請求項２に記載の発明の一実施例であるレーザ
プリンタにおける感光体周辺部の概略構成図である。FIG. 2 is a schematic configuration diagram of a peripheral portion of a photoconductor in a laser printer which is an embodiment of the invention described in claim 2;
【図３】その他の例を示す感光体周辺部の概略構成図で
ある。FIG. 3 is a schematic configuration diagram of a peripheral portion of a photoconductor showing another example.
【図４】さらに他の例を示す感光体周辺部の概略構成図
である。FIG. 4 is a schematic configuration diagram of a peripheral portion of a photoconductor showing still another example.
【図５】前記レーザプリンタの内部機構の全体概略構成
図である。FIG. 5 is an overall schematic configuration diagram of an internal mechanism of the laser printer.
【図６】従来のレーザプリンタの感光体の回転中におけ
る感光体と現像ロ−ラの周速の関係図である。FIG. 6 is a relationship diagram of the peripheral speeds of the photoconductor and the developing roller during rotation of the photoconductor of the conventional laser printer.
１１ 感光体 １７ シート ２６ 現像ロ−ラ 11 photoconductor 17 sheet 26 developing roller
Claims (2)
その感光体上に静電潜像を形成し、現像ロ−ラでトナー
を付着してその潜像を現像して該感光体上に画像を形成
し、その画像を転写してシートに記録を行う電子写真装
置において、前記静電潜像の現像タイミングに合わせて
前記現像ロ−ラを前記感光体より速い周速で回転し、そ
の他の前記感光体の回転期間中は前記現像ロ−ラを前記
感光体とほぼ同じ周速で回転してなる、電子写真装置。1. A photosensitive member is rotated to perform writing after charging, an electrostatic latent image is formed on the photosensitive member, toner is attached by a developing roller to develop the latent image, and the photosensitive member is developed. In an electrophotographic apparatus for forming an image on an upper surface and transferring the image to record on a sheet, the developing roller is rotated at a peripheral speed higher than that of the photoconductor in synchronization with the developing timing of the electrostatic latent image. An electrophotographic apparatus in which the developing roller is rotated at substantially the same peripheral speed as the photosensitive member during the other rotation period of the photosensitive member.
その感光体上に静電潜像を形成し、現像ロ−ラでトナー
を付着してその潜像を現像して該感光体上に画像を形成
し、その画像を転写してシートに記録を行う電子写真装
置において、前記現像ロ−ラと前記感光体とを、前記静
電潜像の現像タイミングに合わせて接触状態とし、その
他の前記感光体の回転期間中は非接触状態としてなる、
電子写真装置。2. A photosensitive member is rotated to perform writing after charging, an electrostatic latent image is formed on the photosensitive member, toner is attached by a developing roller to develop the latent image, and the photosensitive member is developed. In an electrophotographic apparatus for forming an image on the above and transferring the image to record on a sheet, the developing roller and the photoconductor are brought into contact with each other in accordance with the development timing of the electrostatic latent image, During the other rotation period of the photoconductor, it is in a non-contact state,
Electrophotographic device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18314692A JP3164895B2 (en) | 1992-06-17 | 1992-06-17 | Electrophotographic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18314692A JP3164895B2 (en) | 1992-06-17 | 1992-06-17 | Electrophotographic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH063935A true JPH063935A (en) | 1994-01-14 |
| JP3164895B2 JP3164895B2 (en) | 2001-05-14 |
Family
ID=16130611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18314692A Expired - Fee Related JP3164895B2 (en) | 1992-06-17 | 1992-06-17 | Electrophotographic equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3164895B2 (en) |
-
1992
- 1992-06-17 JP JP18314692A patent/JP3164895B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3164895B2 (en) | 2001-05-14 |
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