JPS6123180A - Developing device of electrophotographic copying machine - Google Patents
Developing device of electrophotographic copying machineInfo
- Publication number
- JPS6123180A JPS6123180A JP14489584A JP14489584A JPS6123180A JP S6123180 A JPS6123180 A JP S6123180A JP 14489584 A JP14489584 A JP 14489584A JP 14489584 A JP14489584 A JP 14489584A JP S6123180 A JPS6123180 A JP S6123180A
- Authority
- JP
- Japan
- Prior art keywords
- magnet roll
- developer
- center
- developing device
- roll
- 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
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
- G03G15/0921—Details concerning the magnetic brush roller structure, e.g. magnet configuration
- G03G15/0928—Details concerning the magnetic brush roller structure, e.g. magnet configuration relating to the shell, e.g. structure, composition
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/06—Developing structures, details
- G03G2215/0634—Developing device
- G03G2215/0636—Specific type of dry developer device
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、電子複写機の現像装置に関し、特に該現像
装置内に具備されるマグネットロールの表面構造の改良
に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a developing device for an electronic copying machine, and more particularly to an improvement in the surface structure of a magnet roll provided in the developing device.
第３図は、上記現像装置の一般的な内部構造を模式的に
示したものでワル、はじめに同第３図を参照してこの種
の現像装置の主たる動作について説明する。FIG. 3 schematically shows the general internal structure of the above-mentioned developing device. First, the main operations of this type of developing device will be explained with reference to FIG. 3.
ケース１０で囲繞された該現像装置の内部には、蓮宜な
含有率でトナーＴＮが混合された現像剤ＤＰが予め投入
され、同図の破線で示したような状態で保存されている
。なお上記トナーＴＮは、トナーが、ジス１１内に予め
充填されていて、同装置の駆動時に、発泡ポリウレタン
等からなるトナーディスペンサーロール１２の回転に基
づき均一に分散し落下してブレンダー１３に供給される
。Inside the developing device surrounded by a case 10, a developer DP mixed with toner TN at a suitable content is charged in advance and stored in a state as shown by the broken line in the figure. Note that the toner TN is filled in advance in a container 11, and when the device is driven, it is uniformly dispersed and dropped by the rotation of a toner dispenser roll 12 made of foamed polyurethane or the like and supplied to the blender 13. Ru.
さて、同装置が駆動を開始すると、プレンダー１３は、
上記現像剤ＤＰのトナー含有率が均一となるよう適宜こ
れを攪拌するとともに、同現像剤ＤＰを摩擦帯電する。Now, when the device starts driving, the plendor 13 will:
The developer DP is appropriately stirred so that the toner content is uniform, and the developer DP is triboelectrically charged.
該帯電された現像剤ＤＰは、ノｆドルホイール１４にで
図中矢印の如く搬送され、表面が所定に磁化されたマグ
ネットロール１５上にぎ、クア、ｆされる。そしてマグ
ネットロール１５では、図中矢印Ｆ方向への回転に基づ
いてとのピ、クア、ゾした現像剤ＤＰを搬送するととも
に、感光体２０の表面に形成されている潜像（この形成
については電子複写機の一般的な複写理論において周知
であシ、ここでの説明は割愛する）へこれを符着せしめ
て該潜像を可視像化する。力お、このマグネットロール
１５による上記現像剤ＤＰの搬送に際し、余剰表現像剤
ＤＰは、トリマープレート１６によらて削除され、さら
にミキサープレート１７を通じてブレンダー１３に帰還
する。また、上記現像後の現像剤ＤＰ（）ナー含有率は
低くなっている）は、上記マグネットロール１５表面の
反抗磁場と遠心力とによって同マグネットロール１５か
らビックオフされ、パドルホイール１４の上述した回転
に基づいてこれもブレンダー１３に帰還する。これらブ
レンダー１３に帰還した現像剤ＤＰは、該ブレン５−１
３と上記トナーディスペンサーロール１２との上述した
動作に基づいて再び適描なトナー含有率に調整され、か
つ摩擦帯電される。The charged developer DP is conveyed by a nozzle wheel 14 as shown by the arrow in the figure, and is rolled onto a magnet roll 15 whose surface is magnetized in a predetermined manner. Then, the magnet roll 15 transports the developer DP that has become dark, dark, and dark as it rotates in the direction of the arrow F in the figure, and also transports the latent image formed on the surface of the photoreceptor 20 (this formation is (This is well known in the general copying theory of electronic copying machines, and its explanation is omitted here) to make the latent image visible. Furthermore, when the developer DP is conveyed by the magnet roll 15, the surplus expression developer DP is removed by the trimmer plate 16 and further returned to the blender 13 via the mixer plate 17. Further, the developer DP() after the development (the developer content is low) is kicked off from the magnet roll 15 by the repulsive magnetic field and centrifugal force on the surface of the magnet roll 15, and the above-mentioned rotation of the paddle wheel 14 Based on this, this is also returned to blender 13. The developer DP returned to the blender 13 is transferred to the blender 5-1.
Based on the above-described operations of the toner dispenser roll 12 and the toner dispenser roll 12, the toner content is again adjusted to an appropriate toner content and frictionally charged.
ところで、従来のこうした現像装置においては、上記マ
グネットロール１５の表面が所定に磁化されていて現像
剤ＤＰを上述した如く搬送し得るようになっているとは
いえ、同マグネットロール１５０両端部はどうしても磁
力が低いことがら、上記搬送される現像剤ＤＰもこの両
端部から多くとほれ易いといった問題があった。第４図
は、この様子を上記マグネットロールエ５の正面方向か
ら示したものであル、同マグネットロール１５の回転に
基づいて搬送される現像剤ＤＰは、その両端部から図中
の矢印の如くこほれ落ちる。乙のように現像剤ＤＰが現
像装置の端部に多くこほれ落ちることは、尚該複写機の
機内汚れの大きな原因ともなル好ましく々い。Incidentally, in such a conventional developing device, although the surface of the magnet roll 15 is magnetized in a predetermined manner so that the developer DP can be conveyed as described above, both ends of the magnet roll 150 are inevitably Since the magnetic force is low, there is a problem in that the developer DP being conveyed tends to come loose from both ends. FIG. 4 shows this situation from the front direction of the magnet roll 5, and the developer DP conveyed based on the rotation of the magnet roll 15 flows from both ends as indicated by the arrow in the figure. It falls like this. It is preferable that a large amount of the developer DP drips onto the edge of the developing device as shown in FIG.
この発明は、上述した現像剤がマグネットロールにて搬
送される際に該マグネットロールの両端部へとけれるこ
とを防止しようとするものである。This invention aims to prevent the above-mentioned developer from dissolving to both ends of the magnet roll when it is conveyed by the magnet roll.
〔問題点を解決するための手段及び作用〕この発明では
、上記マグネットロールの表面に、同マグネットロール
表面の中央方向へ向かう螺旋状の溝を設け、同マグネッ
トロールの前述した所定方向への回転によシ、上記搬送
する現像剤を強制的に上記中央方向に寄せ集めるように
する。[Means and effects for solving the problem] In the present invention, a spiral groove is provided on the surface of the magnet roll, which extends toward the center of the magnet roll surface, and the rotation of the magnet roll in the above-described predetermined direction is improved. Alternatively, the developer being transported is forcibly gathered toward the center.
したがって、この発明にかかる電子複写機の現像装置に
よれば、上記マグネッ、トロール両端部への現像剤のと
ほれが有効に防止されるとともに、同マグネットロール
の軸方向へも現像剤が移動するようになることから、現
像効率も大幅に向上することとなる。特に細線の縦横比
や画像濃度は１向上する。Therefore, according to the developing device for an electronic copying machine according to the present invention, the developer is effectively prevented from spilling onto both ends of the magnet and troller, and the developer is also moved in the axial direction of the magnet roll. As a result, development efficiency is also significantly improved. In particular, the aspect ratio and image density of thin lines are improved by 1.
第１図に、この発明にかかる現像装置の一実施例を示す
。ただしここでは、同装置の全体的な構成は先に第３図
に示したものと基本的に同じであるとして、本発明の主
要部をなすマグネットロールにつ、いてのみその構造を
示している。FIG. 1 shows an embodiment of a developing device according to the present invention. However, since the overall configuration of the device is basically the same as that shown in FIG. 3, only the structure of the magnet roll, which is the main part of the present invention, is shown here. .
さてこの実施例では、同第１図に示すよう、Ｋ。In this embodiment, as shown in FIG. 1, K.
マグネットロール１５の唇面に該表面中央部を対称の軸
として左右対称となる螺旋状の溝Ｍｌ、Ｍ２を設けてお
シ、同マグネ−、トロール１５の前述した矢印Ｆ方向へ
の回転に伴なってこれら溝Ｍ１．。Spiral grooves Ml and M2 are provided on the lip surface of the magnet roll 15 and are symmetrical with respect to the center of the surface as an axis of symmetry. These grooves M1. .
Ｍ２が互いに中央方向へ螺動するようにしている。M2 are arranged to mutually screw toward the center.
したがって、前記パドルホイール１４ （第３図参照）
によシこのマグネットロール１５の表面に付着係合され
た現像剤ＤＰは、同マグネットロール１５の上記矢印Ｆ
方向への回転に伴なって、上記溝Ｍｌ、Ｍ２の上述した
螺動に係わる中央方向への流動を催しながら前記感光体
２０（第３図参照）へ搬送されるようになる。また、こ
のような態様で搬送される現像剤ＤＰは、前述した現像
が終了するなどして上記マグネットロール１５からこほ
れ落ちる際にも、上記中央方向へ向かう力によって同現
像装置の中央部へ多くこぼれるようになる。Therefore, the paddle wheel 14 (see FIG. 3)
The developer DP adhered to and engaged with the surface of the magnet roll 15 is moved along the arrow F of the magnet roll 15.
As the photoreceptor rotates in this direction, the photoreceptor 20 (see FIG. 3) is transported to the photoreceptor 20 (see FIG. 3) while flowing toward the center, which is related to the above-described screw movement of the grooves M1 and M2. Furthermore, even when the developer DP conveyed in this manner falls off the magnet roll 15 after the above-mentioned development is completed, it is pushed toward the center of the developing device by the force directed toward the center. It starts to spill a lot.
第２図は、現像剤ＤＰが上記マグネットロール１５から
とほれ落ちる様子を同マグネットロール１５の正面方向
から示したものであシ、このように現像剤ＤＰが現像装
置の中央部に多くこほれるようになれば、当該複写機の
該現像剤り、 Ｐによる機内汚れの問題も解消されるよ
うにｋるとともに、該こほれた現像剤ＤＰの前記パドル
ホイール１４による回収効率も向上してひいては現像装
置としこの運営効率も向上することとなる。また、上記
現像剤ＤＰのマグネットロール１５軸方向への流動によ
って現像効率自体も向上するようになることは前述した
通シである。FIG. 2 shows how the developer DP falls off the magnet roll 15 from the front direction of the magnet roll 15, and as shown, much of the developer DP falls in the center of the developing device. If this becomes possible, the problem of the inside of the copying machine being contaminated by the developer DP will be solved, and the collection efficiency of the broken developer DP by the paddle wheel 14 will also be improved. The operating efficiency of the developing device will also be improved. Further, as described above, the flow of the developer DP in the axial direction of the magnet roll 15 improves the development efficiency itself.
なお、上記の実施例では、マグネットロール１５の表面
に、該表面中央部を対称の軸として左右対称となるよう
螺旋状の溝を設けたが、該螺旋状溝の配設態様はこれに
限らず任意であシ、同螺旋が上記マグネットロール１５
表面の中央方向へ向かうものであ多さえすればいかなる
態様で設けてもよい。In the above embodiment, the spiral grooves were provided on the surface of the magnet roll 15 so as to be symmetrical with respect to the center of the surface as the axis of symmetry, but the arrangement of the spiral grooves is not limited to this. The same spiral may be used as the magnetic roll 15.
It may be provided in any manner as long as it is directed toward the center of the surface.
第１図はこの発明にかかる電子複写機の現像装置の一実
施例についてそのマグネットロールの表面構造を模式的
に示す斜視図、第２図は第１図に示したマグネットロー
ルの作用を説明する略図、第３図はマグネットロールを
具えた現像装置の一般的表構成を示す側面断面図、第４
図は従来の現像装置におけるマグネットロールの作用を
示す略図である。
１ｏ・・・ケース、１１・・・トナー？ツクス、１２・
・・トナーディスペンサーロール、１３・・・ブレンタ
ー、１４・・す（Ｐルホイール、１５・・・マグネット
ロール、１６・・・トリマープレート、１７・・・ミキ
サープレート、２０・・・感光体、ＴＮ・・・トナー、
ＤＰ・・・現像剤。
第１図
第２図
第３図
第４図FIG. 1 is a perspective view schematically showing the surface structure of a magnet roll of an embodiment of the developing device of an electronic copying machine according to the present invention, and FIG. 2 explains the action of the magnet roll shown in FIG. 1. Schematic diagram; Figure 3 is a side sectional view showing a general table configuration of a developing device equipped with a magnet roll;
The figure is a schematic diagram showing the function of a magnet roll in a conventional developing device. 1o...case, 11...toner? Tsukusu, 12・
... Toner dispenser roll, 13 ... Blender, 14 ... (Ple wheel, 15 ... Magnet roll, 16 ... Trimmer plate, 17 ... Mixer plate, 20 ... Photoreceptor, TN ···toner,
DP...developer. Figure 1 Figure 2 Figure 3 Figure 4
Claims (1)
グネットロールの所定方向への回転に基づいて現像剤を
感光体表面の潜像へ搬送付着せしめて該潜像を現像する
電子複写機の現像装置において、前記マグネットロール
の表面に、同マグネットロール表面の中央方向へ向かう
螺旋状の溝を設けたことを特徴とする電子複写機の現像
装置。A developing device for an electronic copying machine, which includes a magnet roll whose surface is magnetized in a predetermined direction, and develops the latent image by conveying and adhering a developer to the latent image on the surface of a photoreceptor based on the rotation of the magnet roll in a predetermined direction. A developing device for an electronic copying machine, characterized in that the surface of the magnet roll is provided with a spiral groove extending toward the center of the surface of the magnet roll.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14489584A JPS6123180A (en) | 1984-07-12 | 1984-07-12 | Developing device of electrophotographic copying machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14489584A JPS6123180A (en) | 1984-07-12 | 1984-07-12 | Developing device of electrophotographic copying machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6123180A true JPS6123180A (en) | 1986-01-31 |
Family
ID=15372828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14489584A Pending JPS6123180A (en) | 1984-07-12 | 1984-07-12 | Developing device of electrophotographic copying machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6123180A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8208840B2 (en) | 2008-03-10 | 2012-06-26 | Ricoh Company, Ltd. | Developer carrier, developing device, image forming apparatus, process cartridge, and image forming method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5226231A (en) * | 1975-08-20 | 1977-02-26 | Oce Van Der Grinten Nv | Magnet roller |
| JPS52140338A (en) * | 1976-05-19 | 1977-11-22 | Hitachi Metals Ltd | Electrostatic latexit image developing apparatus |
| JPS5590982A (en) * | 1978-12-29 | 1980-07-10 | Ricoh Co Ltd | Magnetic brush developing device |
| JPS5724972A (en) * | 1980-07-22 | 1982-02-09 | Fuji Xerox Co Ltd | Magnetic roll for electronic copying machine |
| JPS57189165A (en) * | 1981-05-19 | 1982-11-20 | Nec Corp | Developing device for electrophotography |
| JPS5942568A (en) * | 1982-09-03 | 1984-03-09 | Hitachi Ltd | Developing device |
-
1984
- 1984-07-12 JP JP14489584A patent/JPS6123180A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5226231A (en) * | 1975-08-20 | 1977-02-26 | Oce Van Der Grinten Nv | Magnet roller |
| JPS52140338A (en) * | 1976-05-19 | 1977-11-22 | Hitachi Metals Ltd | Electrostatic latexit image developing apparatus |
| JPS5590982A (en) * | 1978-12-29 | 1980-07-10 | Ricoh Co Ltd | Magnetic brush developing device |
| JPS5724972A (en) * | 1980-07-22 | 1982-02-09 | Fuji Xerox Co Ltd | Magnetic roll for electronic copying machine |
| JPS57189165A (en) * | 1981-05-19 | 1982-11-20 | Nec Corp | Developing device for electrophotography |
| JPS5942568A (en) * | 1982-09-03 | 1984-03-09 | Hitachi Ltd | Developing device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8208840B2 (en) | 2008-03-10 | 2012-06-26 | Ricoh Company, Ltd. | Developer carrier, developing device, image forming apparatus, process cartridge, and image forming method |
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