JPH0115065B2 - - Google Patents
Info
- Publication number
- JPH0115065B2 JPH0115065B2 JP56039543A JP3954381A JPH0115065B2 JP H0115065 B2 JPH0115065 B2 JP H0115065B2 JP 56039543 A JP56039543 A JP 56039543A JP 3954381 A JP3954381 A JP 3954381A JP H0115065 B2 JPH0115065 B2 JP H0115065B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- developer
- sleeve
- scraper
- developing device
- 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.)
- Expired
Links
- 239000000696 magnetic material Substances 0.000 claims description 2
- 238000007790 scraping Methods 0.000 description 9
- 230000005484 gravity Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 230000004907 flux Effects 0.000 description 3
- 239000011812 mixed powder Substances 0.000 description 3
- 230000003313 weakening effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
Description
【発明の詳細な説明】
本発明は一成分系の磁性トナーあるいは磁性キ
ヤリアとトナーとの混合粉体である二成分系の現
像剤等の磁性現像剤を使用して磁気ブラシ法によ
り静電潜像を顕像化する現像装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention uses a magnetic developer such as a one-component magnetic toner or a two-component developer that is a mixed powder of a magnetic carrier and a toner to develop electrostatic latent particles using a magnetic brush method. The present invention relates to a developing device that visualizes an image.
従来から電子複写機やフアクシミリ等において
記録部材上に形成された静電潜像を乾式現像する
方法として、静電潜像と逆極性に帯電したトナー
と称する着色微粉末を少なくとも含む磁性現像剤
を、マグネツトロールと称する内部に固定した磁
界発生手段を有する回転する非磁性スリーブ上に
磁気吸着させて搬送し、磁極上で磁気ブラシを形
成させて静電潜像面を軽く摺擦してトナーを静電
気的に吸着させて顕像化させる磁気ブラシ現像法
が多く用いられている。この磁気ブラシ現像法で
は、現像剤としてたとえば非磁性トナーと鉄粉等
の磁性キヤリアとの混合粉体を用いる場合、トナ
ーに静電潜像と逆磁性に良好な帯電を生じさせ、
現像工程で消費されたトナーを補給し、均一なト
ナー濃度を得るために、現像終了後の現像剤を一
旦マグネツトロールより掻落す必要がある。そこ
で従来の現像装置では磁界発生手段である、たと
えば永久磁石の磁極の強さや配列等を考慮して、
掻落し部の磁界を弱めたうえスクレーパーと称す
る平板状部材を掻落し部に配置して重力作用によ
り現像剤を掻落すことが行なわれていた。しかし
ながら、この装置によれば単純に重力のみによる
掻落しであるためマグネツトロールの非磁性スリ
ーブ上より掻落されてスクレーパー上にのつた現
像剤の落下力が弱く、スクレーパー上に堆積して
十分な掻落しができなかつたり、場合によつては
堆積した現像剤が現像装置よりあふれ出たり、空
回りしたりする等のトラブルを生じることがあつ
た。 Conventionally, as a method for dry developing an electrostatic latent image formed on a recording member in an electronic copying machine, facsimile, etc., a magnetic developer containing at least a colored fine powder called toner charged with the opposite polarity to that of the electrostatic latent image is used. The toner is magnetically attracted and conveyed onto a rotating non-magnetic sleeve, which has a magnetic field generating means fixed inside, called a magnet roll, and a magnetic brush is formed on the magnetic pole to lightly rub the electrostatic latent image surface. A magnetic brush development method is often used in which images are visualized by electrostatically adsorbing them. In this magnetic brush development method, when a mixed powder of a non-magnetic toner and a magnetic carrier such as iron powder is used as a developer, the toner is charged with an electrostatic latent image and good reverse magnetism.
In order to replenish the toner consumed in the development process and obtain a uniform toner density, it is necessary to once scrape off the developer from the magnet roll after development. Therefore, in conventional developing devices, consideration is given to the magnetic field generating means, such as the strength and arrangement of the magnetic poles of the permanent magnet.
In addition to weakening the magnetic field of the scraping section, a flat member called a scraper is placed in the scraping section to scrape off the developer by the action of gravity. However, since this device scrapes off simply by gravity, the falling force of the developer scraped off from the non-magnetic sleeve of the magnet roll and onto the scraper is weak, and the developer is not deposited on the scraper until it is sufficiently removed. Problems such as not being able to scrape off the developing device, or in some cases, the accumulated developer overflowing from the developing device or idle rotation, may occur.
本発明の目的は、上述の従来技術の欠点を解消
し、スクレーパー上の現像剤の堆積を皆無とし、
良好な掻落しが行なえる現像装置を提供すること
である。 The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, to eliminate the accumulation of developer on the scraper;
It is an object of the present invention to provide a developing device that can perform good scraping.
以下本発明の詳細を、従来の現像装置と対比し
つつ図面により説明する。 The details of the present invention will be explained below with reference to the drawings while comparing it with a conventional developing device.
第１図は従来の現像装置の一例を示す断面図で
あり、第２図は本発明の現像装置の一実施例を示
す断面図であり、第１図と同一部分は同一の参照
符号で示す。 FIG. 1 is a sectional view showing an example of a conventional developing device, and FIG. 2 is a sectional view showing an embodiment of the developing device of the present invention. The same parts as in FIG. 1 are designated by the same reference numerals. .
まず第１図において現像槽１中に磁性キヤリア
とトナーとの混合粉体である現像剤２が収容され
ている。現像剤２は磁界発生手段１１（図では
N1磁極が静電潜像担体ドラム３と対向して固定
された４個の磁極を有する永久磁石）の外周を図
示矢印方向に回転する非磁性体よりなるスリーブ
４上に吸着され、スリーブ４と同方向に搬送さ
れ、ドクターと称する規制部材５により均一な厚
さに規制されてN1磁極部に至ると磁束の流れに
そつてブラシ状に穂立していわゆる磁気ブラシを
形成し、セレンドラム等の静電潜像担体３を軽く
摺擦して現像剤中のトナーが潜像面に付着して現
像が行われる。現像後の現像剤２は不足したトナ
ーの補給とキヤリア鉄粉との良好な摩擦帯電とト
ナー濃度の均一化のための混合を必要とするた
め、非磁性体よりなる平板状のスクレーパー６に
より一旦スリーブ４の表面から掻落されて主とし
て重力により現像槽１中に落下する。落下した現
像剤２はトナー貯蔵ポツパー内から補給ローラ８
により現像槽１中に補給されたトナー７と共に混
合スクリユー９，１０により十分に混合される。
ついで現像剤２は搬送磁極N2、S2に再度吸着さ
れて前記の工程が繰返される。 First, in FIG. 1, a developer tank 1 contains a developer 2 which is a mixed powder of a magnetic carrier and toner. The developer 2 is supplied to the magnetic field generating means 11 (in the figure).
The outer periphery of a permanent magnet (having four magnetic poles) whose N1 magnetic pole is fixed facing the electrostatic latent image carrier drum 3 is attracted onto a sleeve 4 made of a non-magnetic material that rotates in the direction of the arrow in the figure. The selenium is transported in the same direction as the magnetic flux, is regulated to have a uniform thickness by a regulating member 5 called a doctor, and when it reaches the N1 magnetic pole, it stands up like a brush along the flow of magnetic flux, forming a so-called magnetic brush. By lightly rubbing the electrostatic latent image carrier 3 such as a drum, the toner in the developer adheres to the latent image surface and development is performed. The developer 2 after development requires replenishment of insufficient toner and mixing with carrier iron powder for good triboelectrification and uniformity of toner concentration. It is scraped off the surface of the sleeve 4 and falls into the developer tank 1 mainly due to gravity. The fallen developer 2 is transferred to the replenishment roller 8 from inside the toner storage popper.
As a result, the toner is sufficiently mixed with the toner 7 replenished into the developer tank 1 by the mixing screws 9 and 10.
Then, the developer 2 is again attracted to the transport magnetic poles N 2 and S 2 and the above steps are repeated.
しかしながら、この現像装置は、図示の如く単
純に掻落し部分の磁極の間隔を離したり、あるい
は掻落し部の磁極（図ではS1極）の磁力を弱めた
りして掻落し部分の磁界を弱めることのみで磁気
吸着力を弱めることにより、現像剤をスクレーパ
ーによりスリーブ表面から掻落していた。したが
つて掻落されてマグネツトロールより分離される
力は主として重力によるため非常に弱く、図示の
如くスクレーパー６の先端部の抵抗によると思わ
れる力およびS1磁極の磁力による磁気吸引力によ
り引きもどされて、スクレーパー６の先端部で盛
り上つて堆積し、最悪の場合落下量が不十分で堆
積した現像剤が現像槽１外にあふれ出る等の事故
を生じることがあつた。 However, this developing device weakens the magnetic field of the scraped part by simply increasing the distance between the magnetic poles of the scraped part as shown in the figure, or by weakening the magnetic force of the magnetic pole of the scraped part (S 1 pole in the figure). By simply weakening the magnetic adsorption force, the developer was scraped off from the sleeve surface with a scraper. Therefore, the force to be scraped off and separated from the magnet roll is very weak because it is mainly due to gravity, and as shown in the figure, it is pulled by the force thought to be due to the resistance of the tip of the scraper 6 and the magnetic attraction force due to the magnetic force of the S1 magnetic pole. When the developer is returned, it bulges up and accumulates at the tip of the scraper 6, and in the worst case, the amount of developer that falls is insufficient and an accident may occur, such as the accumulated developer overflowing outside the developer tank 1.
これに対し、本発明は第１図に示す従来の現像
装置に生じた掻落し不良の原因を詳細に追求した
結果されたもので次のような構成を有している。
本発明の現像装置は第２図に示す如く、磁界発生
手段１１′としてスクレーパー６の下部に、S1磁
極と逆極性の比較的弱い副磁極N3をさらに追加
して配置したものを用い、スクレーパー６の先端
部における磁束の流れ方向（磁力線の方向）がス
クレーパー６の上面と略同一方向となる如くスク
レーパー６を配置することにより、重力以外に磁
気的な力も現像剤の掻落しに効果的に作用せしめ
るようにしたものである。 In contrast, the present invention was developed as a result of detailed investigation into the cause of the scraping failure that occurred in the conventional developing device shown in FIG. 1, and has the following configuration.
As shown in FIG. 2, the developing device of the present invention uses a magnetic field generating means 11' in which a relatively weak sub magnetic pole N3 having a polarity opposite to that of the S1 magnetic pole is additionally disposed below the scraper 6. By arranging the scraper 6 so that the direction of magnetic flux flow (direction of magnetic lines of force) at the tip of the scraper 6 is approximately in the same direction as the top surface of the scraper 6, magnetic force in addition to gravity is effective in scraping off the developer. It is designed to act on the
本発明の現像装置を更に詳細に説明すると、第
２図の掻落し部を拡大した第３図に示す如くスク
レーパー６の下側にスクレーパー６より上側の磁
極（図ではS1）と反対極性の磁極（図ではN3）
を配置したり、又はN3部分に強磁性体を配置し
たりする等の適切な各種の磁気的手段により、ス
クレーパー６の先端部での磁力線の方向をスクレ
ーパー６の上面すなわち現像剤が掻落される方向
と略一致させると、磁力線方向に連鎖状に連なつ
た現像剤は無理なくスクレーパー６の上面にの
り、後続の現像剤に押される力が有効に働き、重
力が加算されて効率よく掻落されるのである。こ
の場合、N3磁極は少なくともS1磁極より弱いも
のが良好であり、実験の結果S1磁極の５〜60％の
範囲の強さを有するものであると効果的であつ
た。これは、N3の磁力がS1の磁力の５％より弱
くなつた場合、従来装置と同様な重力のみによる
掻落しが行なわれ、よつて従来と同様にスクレー
パー先端の堆積がみられ、一方N3の磁力がS1の
磁力の60％を越えるとスクレーパー６先端より離
れた部分で、スクレーパー６をつらぬく磁力線の
スクレーパー６の上面に対する垂直方向成分が増
してこの部分での現像剤の堆積を生じやすくなる
からである。 To explain the developing device of the present invention in more detail, as shown in FIG. 3, which is an enlarged view of the scraping part in FIG . Magnetic pole (N 3 in the diagram)
The upper surface of the scraper 6, that is, the developer is scraped off by various appropriate magnetic means such as arranging a If the direction of the developer is aligned with the direction of the magnetic field lines, the developer chained in the direction of the magnetic field lines will easily ride on the upper surface of the scraper 6, and the force of being pushed by the following developer will work effectively, and the gravity will be added to effectively scrape off the developer. It will be done. In this case, it is preferable that the N 3 magnetic pole be at least weaker than the S 1 magnetic pole, and experiments have shown that it is effective to have a strength in the range of 5 to 60% of the S 1 magnetic pole. This is because when the magnetic force of N 3 becomes weaker than 5% of the magnetic force of S 1 , scraping is performed only by gravity as in the conventional device, and therefore, the same accumulation at the scraper tip is observed as in the conventional device. When the magnetic force of N 3 exceeds 60% of the magnetic force of S 1 , the vertical component of the magnetic line of force passing through the scraper 6 increases in the part away from the tip of the scraper 6, and the developer accumulates in this part. This is because it becomes more likely to occur.
具体例
第２図の現像装置において、スリーブとして外
径50mmのステンレス製スリーブを用い、S1磁極と
N3磁極間角度を60゜としスクレーパーの水平線に
対する傾斜を45゜とし、S1磁極の磁力の強さをス
リーブ上850ガウスとし、N3磁極の磁力の強さが
50〜500ガウスの範囲にあり、スクレーパー先端
位置がS1磁極中心より15〜40゜だけ下流側（N3磁
極より）に配置された条件において、良好な掻落
しが行なわれた。Specific example: In the developing device shown in Figure 2, a stainless steel sleeve with an outer diameter of 50 mm is used as the sleeve, and the S 1 magnetic pole and
The angle between the N 3 magnetic poles is 60°, the slope of the scraper with respect to the horizontal line is 45°, the magnetic strength of the S 1 magnetic pole is 850 Gauss on the sleeve, and the magnetic strength of the N 3 magnetic pole is
Good scraping was achieved under the conditions that the pressure was in the range of 50 to 500 Gauss and the scraper tip was placed 15 to 40 degrees downstream (from the N3 magnetic pole) from the center of the S1 magnetic pole.
第１図は従来の現像装置の一例を示す断面図、
第２図は本発明の現像装置の一実施例を示す断面
図、第３図は第２図の掻落し部の拡大断面図であ
る。
１：現像槽、２：現像剤、３：静電潜像担体ド
ラム、４：非磁性スリーブ、５：ドクターブレー
ド、６：スクレーパー、７：トナー、８：トナー
補給ローラ、９，１０：混合スクリユー、１１，
１１′：磁界発生手段。
FIG. 1 is a sectional view showing an example of a conventional developing device.
FIG. 2 is a cross-sectional view showing one embodiment of the developing device of the present invention, and FIG. 3 is an enlarged cross-sectional view of the scraping portion of FIG. 2. 1: Developer tank, 2: Developer, 3: Electrostatic latent image carrier drum, 4: Non-magnetic sleeve, 5: Doctor blade, 6: Scraper, 7: Toner, 8: Toner supply roller, 9, 10: Mixing screw ,11,
11': Magnetic field generating means.
Claims (1)
れた非磁性体からなるスリーブと、該スリーブ内
に静止して配置された磁界発生手段と、前記スリ
ーブ上に保持された磁性現像剤を前記スリーブか
ら分離する平板状のスクレーパー部材とを有する
現像装置において、前記スクレーパー部材の下側
に、この部材より前段階位置の磁極と逆極性でか
つその強さの５〜60％の比較的弱い磁極を設ける
とともに、前記スクレーパー部材をその先端上面
が前記磁界発生手段より流出する磁力線の方向と
略平行となるように設置したことを特徴とする現
像装置。1. A sleeve made of a non-magnetic material that is rotatably disposed facing the surface of the electrostatic latent image carrier, a magnetic field generating means that is disposed stationary within the sleeve, and a magnetic developer held on the sleeve. In a developing device having a flat scraper member that separates the scraper member from the sleeve, a magnetic pole is placed on the underside of the scraper member with a relatively opposite polarity and 5 to 60% of the strength of the magnetic pole at a position earlier than the scraper member. A developing device characterized in that a weak magnetic pole is provided and the scraper member is installed so that the top surface of the tip thereof is substantially parallel to the direction of the lines of magnetic force flowing out from the magnetic field generating means.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3954381A JPS57155567A (en) | 1981-03-20 | 1981-03-20 | Developing device |
| US06/357,295 US4436055A (en) | 1981-03-20 | 1982-03-11 | Developing apparatus |
| GB8207115A GB2097294B (en) | 1981-03-20 | 1982-03-11 | Developing apparatus |
| DE3210093A DE3210093C2 (en) | 1981-03-20 | 1982-03-19 | Development facility |
| DE3249322A DE3249322C2 (en) | 1981-03-20 | 1982-03-19 | Magnetic developer scraper in a magnetic brush developer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3954381A JPS57155567A (en) | 1981-03-20 | 1981-03-20 | Developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57155567A JPS57155567A (en) | 1982-09-25 |
| JPH0115065B2 true JPH0115065B2 (en) | 1989-03-15 |
Family
ID=12555961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3954381A Granted JPS57155567A (en) | 1981-03-20 | 1981-03-20 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57155567A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0112273Y2 (en) * | 1981-04-27 | 1989-04-11 | ||
| JP2515712B2 (en) * | 1983-07-08 | 1996-07-10 | 日立金属株式会社 | Development device |
| JPH05127537A (en) * | 1991-11-08 | 1993-05-25 | Fujitsu Ltd | Developing device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS536034A (en) * | 1976-07-06 | 1978-01-20 | Ricoh Co Ltd | Process and device for magnetic brush developing |
-
1981
- 1981-03-20 JP JP3954381A patent/JPS57155567A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS536034A (en) * | 1976-07-06 | 1978-01-20 | Ricoh Co Ltd | Process and device for magnetic brush developing |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57155567A (en) | 1982-09-25 |
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