JPH0355582A - Electrophotographic printing device - Google Patents

Electrophotographic printing device

Info

Publication number
JPH0355582A
JPH0355582A JP19177489A JP19177489A JPH0355582A JP H0355582 A JPH0355582 A JP H0355582A JP 19177489 A JP19177489 A JP 19177489A JP 19177489 A JP19177489 A JP 19177489A JP H0355582 A JPH0355582 A JP H0355582A
Authority
JP
Japan
Prior art keywords
developing sleeve
magnetic
toner
magnetic toner
magnetic 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
Application number
JP19177489A
Other languages
Japanese (ja)
Inventor
Shigeru Sugiharai
杉原井 茂
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP19177489A priority Critical patent/JPH0355582A/en
Publication of JPH0355582A publication Critical patent/JPH0355582A/en
Pending legal-status Critical Current

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  • Magnetic Brush Developing In Electrophotography (AREA)

Abstract

PURPOSE:To prevent a defect in printing from being caused by coupling a driving means, which rotates a magnetic roller at need in the opposite direction from the rotating direction of a developing sleeve, with the magnetic roller. CONSTITUTION:The driving means which rotates the magnetic roller 3 of a developing device in the opposite direction from the rotating direction of the developing sleeve 2 is arranged on the magnetic roller 3 and the driving means is operated at need, e.g. at the end of printing operation to reverse the magnetic roller. Thus, the condensate of toner filling the gap between a doctor blade 6 and the developing sleeve 2 is attracted in the opposite direction from the normal direction with the magnetic force of the magnetic roller 3 and removed before next printing operation is started. Consequently, a blank part of a print which is formed when the supply of magnetic toner to the developing sleeve is interrupted is eliminated to eliminate the occurrence of the print defect effectively in advance.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、電子写真式印刷装置に係り、特に1或分トナ
ーを現像に用いるのに好適な電子写真式印刷装置に関す
るものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrophotographic printing device, and particularly to an electrophotographic printing device suitable for using one portion of toner for development.

〔従来の技術〕[Conventional technology]

従来より、この種の電子写真式印刷装置においては、光
の照射によって表面に静電潜像を形或する円筒形状の感
光体と、この感光体表面に磁性トナーを供給して静電潜
像の可視化を行う現像器を有している。そして、現像器
を、感光体に対向して平行かつ外力により回転自在に装
備され感光体表面に磁性トナーを供給する円筒形状の現
像スリ−ブと、この現像スリーブの内部に配設されて磁
力により磁性トナーを当該現像スリーブの表面に引き付
ける磁気ローラと、現像スリーブの半面を外部に残りの
半面をその内部に装備したハウジングと、このハウジン
グの内部に配設されて磁性トナーを貯蔵するとともに現
像スリーブにその磁性トナーを供給するトナーホッパー
と、ハウジングに取り付けられて現像スリーブ表面の磁
性トナーの厚さを一定とするドクターブレードとから構
或している。
Conventionally, this type of electrophotographic printing device uses a cylindrical photoreceptor that forms an electrostatic latent image on its surface by irradiation with light, and a cylindrical photoreceptor that forms an electrostatic latent image by supplying magnetic toner to the surface of this photoreceptor. It has a developing device for visualization. The developing device is equipped with a cylindrical developing sleeve that is parallel to the photoreceptor and rotatable by an external force and supplies magnetic toner to the surface of the photoreceptor; a magnetic roller that attracts the magnetic toner to the surface of the developing sleeve; a housing having one half of the developing sleeve outside and the other half inside; It consists of a toner hopper that supplies the magnetic toner to the sleeve, and a doctor blade that is attached to the housing and that keeps the thickness of the magnetic toner on the surface of the developing sleeve constant.

ここで使用されている現像器では、磁気ローラの磁力に
よって磁性トナーを引き付け、現像スリーブ表面に磁性
トナーを付着させる。現像スリーブは、その表面速度が
感光体の表面速度に適応して回転しており、ハウジング
に取り付けられているドクターブレードによって現像ス
リーブ表面に付着している磁性トナーの厚さを一定にし
ている。
In the developing device used here, magnetic toner is attracted by the magnetic force of the magnetic roller, and the magnetic toner is attached to the surface of the developing sleeve. The developing sleeve rotates at a surface speed that matches the surface speed of the photoreceptor, and a doctor blade attached to the housing keeps the thickness of the magnetic toner attached to the surface of the developing sleeve constant.

そして、現像スリーブ表面の磁性トナーを感光体表面に
供給して、感光体表面に形或されている静電潜像を可視
化して現像を行っている。
Then, magnetic toner on the surface of the developing sleeve is supplied to the surface of the photoreceptor to visualize and develop the electrostatic latent image formed on the surface of the photoreceptor.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

しかしながら、上記従来例においては、現像スリーブ表
面に付着している磁性トナーの厚さをドクターブレード
によって均一にしているため、磁性トナーに圧力が作用
し、さらに、現像スリーブに供給される磁性トナーのよ
うにホッパーの底部にあるものは常に上から圧力をうけ
ているため、トナーの凝縮物が発生し易いという欠点が
あった。
However, in the above conventional example, since the thickness of the magnetic toner adhering to the developing sleeve surface is made uniform by the doctor blade, pressure is applied to the magnetic toner, and furthermore, the thickness of the magnetic toner that is supplied to the developing sleeve is Since the bottom of the hopper is always under pressure from above, it has the disadvantage that toner condensation tends to occur.

このため、時には、ドクターブレードと現像スリーブと
の隙間にトナーの凝縮物が詰まって現像スリーブへの磁
性トナーの供給が一時的に停止し、印刷に空白部分が生
じて印字欠陥を招くという不都合が生じていた。
As a result, sometimes the gap between the doctor blade and the developer sleeve becomes clogged with toner condensate, temporarily stopping the supply of magnetic toner to the developer sleeve, resulting in blank areas and print defects. It was happening.

〔発明の目的〕[Purpose of the invention]

本発明の目的は、このような従来例に見られる不都合を
改善し、ドクターブレードと現像スリーブとの隙間にト
ナーの凝縮物が詰まって、現像スリーブへの磁性トナー
の供給が停止し、印刷に空白部分が生じて印字欠陥とな
ることを防止する電子写真式印刷装置を供給することに
ある.〔課題を解決するための手段〕 本発明では、光の照射によって表面に静電潜像を形或す
る円筒形状の感光体と、この感光体表面に磁性トナーを
供給して静電潜像の可視化を行う現像器を有するととも
に、この現像器が、感光体に対向して平行かつ外力によ
り回転自在に装備され感光体表面に磁性トナーを供給す
る円筒形状の現像スリーブと、この現像スリーブの内部
に回転自在に配設されて磁力により磁性トナーを当該現
像スリーブの表面に引き付ける磁気ローラと、現像スリ
ーブの半面を外部に残りの半面をその内底部に装備した
ハウジングと、このハウジングの内部に配設されて磁性
トナーを貯蔵するとともに現像スリーブにその磁性トナ
ーを供給するトナーホッパーと、ハウジングに取り付け
られて現像スリーブ表面の磁性トナーの厚さを一定とす
るドクターブレードによって構成されている。そして、
磁気ローラを現像スリーブと逆方向に回転せしめる駆動
手段を当該磁気ローラに配設するとともに、印字動作完
了後に駆動手段を制御して回転せしめる制御部を装備す
るという手法を採っている。これによって、前述した目
的を達威しようとするものである。
The purpose of the present invention is to improve the disadvantages seen in the conventional example, and to prevent toner condensation from clogging the gap between the doctor blade and the developing sleeve, stopping the supply of magnetic toner to the developing sleeve and preventing printing. Our objective is to provide an electrophotographic printing device that prevents printing defects caused by blank areas. [Means for Solving the Problems] The present invention includes a cylindrical photoconductor that forms an electrostatic latent image on its surface by irradiation with light, and a magnetic toner that is supplied to the surface of the photoconductor to form the electrostatic latent image. The developing device includes a cylindrical developing sleeve which is equipped parallel to the photoreceptor and rotatable by an external force to supply magnetic toner to the surface of the photoreceptor, and the inside of the developing sleeve. A magnetic roller is rotatably disposed in the housing and attracts the magnetic toner to the surface of the developing sleeve by magnetic force; a housing having one half of the developing sleeve on the outside and the other half on the inner bottom thereof; The toner hopper is provided to store magnetic toner and supply the magnetic toner to the developing sleeve, and the doctor blade is attached to the housing to keep the thickness of the magnetic toner constant on the surface of the developing sleeve. and,
A method is adopted in which a driving means for rotating the magnetic roller in the opposite direction to the developing sleeve is disposed on the magnetic roller, and a control section is provided for controlling and rotating the driving means after the printing operation is completed. This is intended to achieve the above-mentioned purpose.

〔作  用〕[For production]

磁気ローラの磁力によってホッパーに貯蔵されている磁
性トナーを引き付け、ハウジングの内部にある現像スリ
ーブ表面に磁性トナーを付着させる。現像スリーブは、
その表面速度が感光体の表面速度に適応して回転してお
り、磁性トナーを付着した半面がハウジングの内部から
外部に出る際に、ハウジングに取り付けられているドク
ターブレードによって表面に付着している磁性トナーの
厚さを一定にする。そして、現像スリーブ表面の磁性ト
ナーを感光体表面に均一に供給して、感光体表面に形威
されている静電潜像を可視化して現像を行っている。
The magnetic force of the magnetic roller attracts the magnetic toner stored in the hopper and causes the magnetic toner to adhere to the surface of the developing sleeve inside the housing. The developing sleeve is
The surface speed of the magnetic toner rotates in accordance with the surface speed of the photoconductor, and when the half surface with the magnetic toner attached comes out from the inside of the housing, it is attached to the surface by a doctor blade attached to the housing. Keep the thickness of magnetic toner constant. Then, the magnetic toner on the surface of the developing sleeve is uniformly supplied to the surface of the photoreceptor, and the electrostatic latent image formed on the surface of the photoreceptor is visualized and developed.

以上の手順で現像動作が完了すると、直ちに駆動手段を
作動させて磁気ローラを現像動作時の現像スリーブの回
転方向と逆方向に回転させる。これにより、ドクターブ
レード近傍のトナーがホッパー側に戻される。
Immediately after the development operation is completed through the above steps, the driving means is activated to rotate the magnetic roller in a direction opposite to the direction of rotation of the developing sleeve during the development operation. As a result, the toner near the doctor blade is returned to the hopper side.

〔発明の実施例〕[Embodiments of the invention]

以下、本発明の一実施例を第1図および第2図に基づい
て説明する. この第1図に示す実施例においては、光の照射によって
表面に静電潜像を形或する円筒形状の感光体10と、こ
の感光体lO表面に磁性トナー1を供給して静電潜像の
可視化を行う現像器100を有するとともに、この現像
器100を、感光体10に対向して平行かつ外力により
回転自在に装備され感光体10表面に磁性トナー1を供
給する円筒形状の現像スリーブ2と、この現像スリーブ
2の内部に回転自在に配設されて磁力により磁性トナー
1を当該現像スリーブ2の表面に引き付ける磁気ローラ
3と、現像スリーブ2の半面を外部に残りの半面をその
内底部に装備したハウジング4と、このハウジング4の
内部に配設されて磁性トナー1を貯蔵するとともに現像
スリーブ2にその磁性トナー1を供給するトナーホッパ
−5と、ハウジング4に取り付けられて現像スリーブ2
表面の磁性トナー1の厚さを一定とするドクターブレー
ド6とから構成されている。そして、磁気ローラ3を現
像スリーブ2の回転方向と逆方向に回転せしめる駆動手
段11を当該磁気ローラ3に配設するとともに、印字動
作完了後に駆動手段11を制御して磁気ローラ3を回転
(第1図中B方向)せしめる制御部12を装備している
An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In the embodiment shown in FIG. 1, a cylindrical photoreceptor 10 forms an electrostatic latent image on its surface by irradiation with light, and a magnetic toner 1 is supplied to the surface of this photoreceptor 10 to form an electrostatic latent image. A cylindrical developing sleeve 2 is provided with a developing device 100 for visualizing the image, and the developing device 100 is mounted parallel to the photoreceptor 10 and rotatable by an external force to supply magnetic toner 1 to the surface of the photoreceptor 10. A magnetic roller 3 is rotatably disposed inside the developing sleeve 2 and attracts the magnetic toner 1 to the surface of the developing sleeve 2 by magnetic force, and a magnetic roller 3 is arranged such that one half of the developing sleeve 2 is placed on the outside and the other half is placed on the inner bottom thereof. a toner hopper 5 disposed inside the housing 4 for storing the magnetic toner 1 and supplying the magnetic toner 1 to the developing sleeve 2; a toner hopper 5 attached to the housing 4 for storing the magnetic toner 1;
It is composed of a doctor blade 6 that keeps the thickness of the magnetic toner 1 on the surface constant. A driving means 11 for rotating the magnetic roller 3 in a direction opposite to the rotational direction of the developing sleeve 2 is disposed on the magnetic roller 3, and after the printing operation is completed, the driving means 11 is controlled to rotate the magnetic roller 3 (first 1).

次に、第1図および第2図に基づいて動作説明をする。Next, the operation will be explained based on FIGS. 1 and 2.

帯電器50によって表面を一様に帯電した感光体10表
面を、光の点像を入力データに対応して点滅させながら
ライン走査する。露光された感光体IO表面は放電して
静電潜像が形威される。この感光体10表面と僅かな間
隔を保って現像スリーブ2が感光体10の表面速度に対
応した速度で回転している。この現像スリーブ2は、そ
の内部に装備している磁気ローラ3の磁力によってトナ
ーホッパ−5に貯蔵されている磁性トナー1を引き付け
、ハウジング4の内部にある現像スリーブ2表面に磁性
トナー1を付着させる.磁性トナー1を付着した半面が
ハウジング4の内部から外部に出る際に、ハウジング4
に取り付けられているドクターブレード6によって表面
に付着している磁性トナー1の厚さを一定にする。そし
て、現像スリーブ2表面の磁性トナー1を感光体10表
面に均一に供給して、感光体lO表面に形威されている
静電潜像を可視化して現像を行う。感光体IO表面上で
現像されたトナー1像は、転写器51によって印刷用紙
52の背後から磁性トナーと反対の電荷をあたえること
により印刷用紙52上にトナーを引き付けて転写される
。さらに、トナー像が転写された印刷用祇52は定着器
53に送られて、圧力および熱によってトナー像を印刷
用祇52上に定着させて印刷動作を完了する。そして、
感光体10はクリーナー54によって残留トナーを除去
し、再び帯電器50によって一様に帯電させられる。こ
のプロセスをくりかえして印刷が行われる。
The surface of the photoreceptor 10, which has been uniformly charged by the charger 50, is line-scanned while blinking a point image of light in accordance with input data. The exposed surface of the photoreceptor IO is discharged and an electrostatic latent image is formed. The developing sleeve 2 is rotated at a speed corresponding to the surface speed of the photoreceptor 10 while keeping a small distance from the surface of the photoreceptor 10 . This developing sleeve 2 attracts the magnetic toner 1 stored in the toner hopper 5 by the magnetic force of the magnetic roller 3 installed inside the developing sleeve 2, and causes the magnetic toner 1 to adhere to the surface of the developing sleeve 2 inside the housing 4. .. When the half surface to which the magnetic toner 1 is attached comes out from the inside of the housing 4, the housing 4
The thickness of the magnetic toner 1 adhering to the surface is made constant by a doctor blade 6 attached to the toner. Then, the magnetic toner 1 on the surface of the developing sleeve 2 is uniformly supplied to the surface of the photoreceptor 10, and the electrostatic latent image formed on the surface of the photoreceptor 10 is visualized and developed. The toner 1 image developed on the surface of the photoconductor IO is transferred onto the printing paper 52 by applying a charge opposite to that of the magnetic toner from behind the printing paper 52 by the transfer device 51 to attract the toner onto the printing paper 52 . Further, the printing sleeve 52 onto which the toner image has been transferred is sent to a fixing device 53, and the toner image is fixed onto the printing sleeve 52 by pressure and heat, thereby completing the printing operation. and,
Residual toner is removed from the photoreceptor 10 by a cleaner 54, and the photoreceptor 10 is uniformly charged again by a charger 50. Printing is performed by repeating this process.

以上の手順で現像動作が完了すると、制御部12は駆動
手段11を用いて磁気ローラ3を現像動作時の現像スリ
ーブ2の回転方向(第1図中八方向)と逆方向(第1図
中B方向)に回転させる。
When the developing operation is completed according to the above procedure, the control unit 12 uses the driving means 11 to move the magnetic roller 3 in the direction opposite to the rotating direction (the 8th direction in FIG. 1) of the developing sleeve 2 during the developing operation (the 8th direction in FIG. 1). direction B).

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明では、現像器の磁気ローラ
を現像スリーブの回転方向と逆方向に回転せしめる駆動
手段を当該磁気ローラに配設するとともに、印字動作完
了後など必要に応じて駆動手段を作動させて磁気ローラ
を逆回転せしめるようにした。これによって、ドクター
ブレードと現像スリーブとの隙間に詰まったトナーの凝
縮物を磁気ローラの磁力によって通常と逆方向に引き付
けて、次の印字動作に入る前にその凝縮物を取り除くこ
とができ、これがため、現像スリーブへの磁性トナーの
供給中断等によって生じていた印刷の空白部分無くなり
、印字欠陥の発生を予め有効に徘除することができると
いう従来にない優れた電子写真式印刷装置を提供するこ
とができる。
As described above, in the present invention, a driving means for rotating the magnetic roller of the developing device in the direction opposite to the rotating direction of the developing sleeve is disposed on the magnetic roller, and the driving means was activated to cause the magnetic roller to rotate in the opposite direction. This allows the toner condensate stuck in the gap between the doctor blade and developer sleeve to be drawn in the opposite direction by the magnetic force of the magnetic roller and removed before the next printing operation. To provide an unprecedented and excellent electrophotographic printing device, which eliminates printing blank areas caused by interruption of supply of magnetic toner to a developing sleeve, etc., and can effectively eliminate the occurrence of printing defects in advance. be able to.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の一実施例をあらわす現像器部分の断面
図、第2図は電子写真式印刷装置の全体のプロセスを示
す説明図である。 1・・・・・・磁性トナー、2・・・・・・現像スリー
ブ、3・・・・・・磁気ローラ、4・・・・・・ハウジ
ング、5・・・・・・トナーホッパー、6・・・・・・
ドクターブレード、10・・・・・・感光体、11・・
・・・・駆動手段、12・・・・・・制御部、l00・
・・・・・現像器。
FIG. 1 is a sectional view of a developing unit showing an embodiment of the present invention, and FIG. 2 is an explanatory view showing the entire process of an electrophotographic printing apparatus. 1...Magnetic toner, 2...Developing sleeve, 3...Magnetic roller, 4...Housing, 5...Toner hopper, 6・・・・・・
Doctor blade, 10... Photoreceptor, 11...
... Drive means, 12 ... Control section, l00.
...Developer.

Claims (1)

【特許請求の範囲】[Claims] (1)、光の照射によって表面に静電潜像を形成する円
筒形状の感光体と、この感光体表面に磁性トナーを供給
して静電潜像の可視化を行う現像器を有するとともに、 この現像器が、前記感光体に対向して平行かつ外力によ
り回転自在に装備され感光体表面に磁性トナーを供給す
る円筒形状の現像スリーブと、この現像スリーブの内部
に回転自在に配設されて磁力により磁性トナーを当該現
像スリーブの表面に引き付ける磁気ローラと、前記現像
スリーブの半面を外部に残りの半面をその内底部に装備
したハウジングと、このハウジングの内部に配設されて
磁性トナーを貯蔵するとともに前記現像スリーブにその
磁性トナーを供給するトナーホッパーと、前記ハウジン
グに取り付けられて前記現像スリーブ表面の磁性トナー
の厚さを一定とするドクターブレードとによって構成さ
れて成る電子写真式印刷装置において、 前記磁気ローラを必要に応じて前記現像スリーブの回転
方向とは逆の方向に回転せしめる駆動手段を当該磁気ロ
ーラに前記磁気ローラに連結装備したことを特徴とする
電子写真式印刷装置。
(1) It has a cylindrical photoconductor that forms an electrostatic latent image on its surface by irradiation with light, and a developer that supplies magnetic toner to the surface of this photoconductor to visualize the electrostatic latent image. A developing device is provided with a cylindrical developing sleeve which is installed parallel to the photoreceptor and rotatable by an external force and supplies magnetic toner to the surface of the photoreceptor; a magnetic roller that attracts the magnetic toner to the surface of the developing sleeve; a housing having one half of the developing sleeve on the outside and the other half on the inner bottom thereof; and a housing disposed inside the housing to store the magnetic toner. An electrophotographic printing device comprising: a toner hopper that supplies the magnetic toner to the developing sleeve; and a doctor blade attached to the housing to keep the thickness of the magnetic toner on the surface of the developing sleeve constant; An electrophotographic printing apparatus characterized in that the magnetic roller is connected to and equipped with a driving means for rotating the magnetic roller in a direction opposite to the rotating direction of the developing sleeve as required.
JP19177489A 1989-07-25 1989-07-25 Electrophotographic printing device Pending JPH0355582A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19177489A JPH0355582A (en) 1989-07-25 1989-07-25 Electrophotographic printing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19177489A JPH0355582A (en) 1989-07-25 1989-07-25 Electrophotographic printing device

Publications (1)

Publication Number Publication Date
JPH0355582A true JPH0355582A (en) 1991-03-11

Family

ID=16280309

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19177489A Pending JPH0355582A (en) 1989-07-25 1989-07-25 Electrophotographic printing device

Country Status (1)

Country Link
JP (1) JPH0355582A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4620800B1 (en) * 2010-04-30 2011-01-26 幸春 濱口 Tie fastening.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4620800B1 (en) * 2010-04-30 2011-01-26 幸春 濱口 Tie fastening.
JP2011229796A (en) * 2010-04-30 2011-11-17 Yukiharu Hamaguchi Tie clip

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