JPH0447831B2 - - Google Patents
Info
- Publication number
- JPH0447831B2 JPH0447831B2 JP21102482A JP21102482A JPH0447831B2 JP H0447831 B2 JPH0447831 B2 JP H0447831B2 JP 21102482 A JP21102482 A JP 21102482A JP 21102482 A JP21102482 A JP 21102482A JP H0447831 B2 JPH0447831 B2 JP H0447831B2
- Authority
- JP
- Japan
- Prior art keywords
- developer
- magnetic
- developing
- sleeve
- scraping
- 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
- 238000007790 scraping Methods 0.000 claims description 20
- 230000005389 magnetism Effects 0.000 claims 1
- 238000004140 cleaning Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 230000004907 flux Effects 0.000 description 3
- 108091008695 photoreceptors Proteins 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003313 weakening effect Effects 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、複数の固定磁極と非磁性回転スリー
ブとから成るスリーブ回転型の磁気ロール表面に
付着した磁性現像剤をかき取り板によつてかき取
る現像剤かき取り装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a developer scraping device that uses a scraping plate to scrape off magnetic developer adhering to the surface of a sleeve-rotating magnetic roll, which is composed of a plurality of fixed magnetic poles and a non-magnetic rotating sleeve. Regarding.
このような磁性現像剤（磁性キヤリヤを用いた
二成分現像剤又は磁性トナーと用いた一成分現像
剤、以下総称して磁性現像剤とする）をかき取る
現像剤かき取り装置は、複写機の現像装置又は清
掃装置に適用されている。この現像装置又は清掃
装置においては、現像領域又は清掃領域へ現像剤
を搬送する手段が設けられているが、この現像剤
搬送手段としては、磁石回転型、スリーブ回転型
又は磁石・スリーブ両回転型が考えられている。
この３つの型のうち、スリーブ回転型の現像剤搬
送手段が、コスト、消費電力、高速適性の面で優
れており、多く使用されている。このスリーブ回
転型の現像剤搬送手段を用いた現像装置の例を第
１図に示す。この現像剤搬送手段は現像ロール１
であり、その下方に配置された別の現像剤搬送部
材２から現像剤を磁気的に引き付け、現像領域Ａ
へ搬送する。現像ロール１は複数の固定磁石３と
回転スリーブ４とで構成され、この回転スリーブ
４に隣接してスクレーパ５で成るかき取り装置が
設けられている。このかき取り装置によつて現像
領域を通過した後に回転スリーブ４上に残存する
現像剤が除去される。 A developer scraping device for scraping off such magnetic developer (two-component developer using a magnetic carrier or one-component developer using magnetic toner, hereinafter collectively referred to as magnetic developer) is installed in a copying machine. Applied to developing devices or cleaning devices. This developing device or cleaning device is provided with a means for conveying the developer to the developing area or the cleaning area, and the developer conveying means may be a magnet rotating type, a sleeve rotating type, or a magnet/sleeve rotating type. is being considered.
Of these three types, the sleeve rotating type developer conveying means is superior in terms of cost, power consumption, and high speed suitability, and is therefore widely used. An example of a developing device using this sleeve rotation type developer conveying means is shown in FIG. This developer conveying means is the developing roll 1.
, magnetically attracts the developer from another developer conveying member 2 disposed below, and transfers the developer to the developing area A.
Transport to. The developing roll 1 is composed of a plurality of fixed magnets 3 and a rotating sleeve 4, and a scraping device consisting of a scraper 5 is provided adjacent to the rotating sleeve 4. This scraping device removes the developer remaining on the rotating sleeve 4 after passing through the development area.
しかしながら、最近では、二成分現像剤におけ
る磁性キヤリヤの小粒化、磁性トナーの使用の増
大にともない、個々の磁性現像剤の自重が従来の
現像剤に比して軽量化されており、そのため回転
スリーブの回転運動によるその接線方向の慣性力
による自然落下が期待できない。したがつて現像
剤がたとえスクレーパ５によつてかき取られたと
しても、スリーブの表面付近に浮遊し、かき取り
部分に隣接する磁界によつてすぐさまスリーブ表
面に捕獲されるため、現像剤のかき取りが円滑に
行なわれないという欠点を有していた。これは現
像に悪影響を与えるばかりでなく現像装置の構成
にも種々の制限を加えていた。 However, in recent years, with the miniaturization of magnetic carrier particles in two-component developers and the increased use of magnetic toner, the weight of each magnetic developer has been reduced compared to conventional developers. Natural fall cannot be expected due to the inertial force in the tangential direction due to the rotational motion of the object. Therefore, even if the developer is scraped off by the scraper 5, it floats near the surface of the sleeve and is immediately captured on the sleeve surface by the magnetic field adjacent to the scraped portion, so that the developer is not scraped off. This has the disadvantage that removal cannot be carried out smoothly. This not only adversely affects development, but also imposes various restrictions on the configuration of the developing device.
本発明は、この点に鑑み、現像剤のかき取りを
円滑に行ない、円滑な現像剤の循環を得るととも
に現像装置構成上の自由度を増すことにある。 In view of this point, the present invention aims to smoothly scrape off the developer, obtain smooth circulation of the developer, and increase the degree of freedom in the configuration of the developing device.
すなわち、本発明は、複数の固定磁極と非磁性
回転スリーブとから成るスリーブ回転型の磁気ロ
ール表面に付着した磁性現像剤をかき取り板によ
つてかき取る現像剤かき取り装置において、かき
取り板直後の磁極と逆の極性を有する磁石をその
かき取り板直後の磁極と対向して配置し、この磁
石により、かき取り板直後の磁極による磁力を弱
め、かき取り動作を円滑に行なうことを特徴とす
る。 That is, the present invention provides a developer scraping device that uses a scraping plate to scrape off magnetic developer adhering to the surface of a sleeve-rotating magnetic roll that includes a plurality of fixed magnetic poles and a non-magnetic rotating sleeve. A magnet with a polarity opposite to the magnetic pole immediately after the scraping plate is placed opposite to the magnetic pole immediately after the scraping plate, and this magnet weakens the magnetic force caused by the magnetic pole immediately after the scraping plate, making the scraping operation smooth. shall be.
以下図面を参照しながら本発明の実施例につい
て説明する。第２図は、第１図と同様な形状の現
像装置に本発明を適用した実施例を示している。
この現像装置は、現像ロール１０と搬送部材１１
とで構成され、これらはともに現像ハウジング１
２内に回転可能に支持されている。現像ハウジン
グの下部には現像剤が蓄積され、この現像剤は搬
送部材１１のよつて現像ロール１０へ供給され
る。現像ロール１０は複数の固定磁極１３とその
まわりを囲む非磁性回転スリーブ１４とで構成さ
れ、上記搬送部材１１により供給される現像剤
は、固定磁極１３により作られる磁界によつてス
リーブ１４の表面上に引き付けられ、その回転運
動にともなつて現像領域Ａに搬送される。この搬
送路の途中にはトリマー１５が配置されており、
このトリマーによつて現像剤層の高さが適当な値
に調節される。現像ロール１０は現像領域Ａにお
いて感光体（図示せず）と近接して配置されてお
り、現像剤を感光体表面に供給して現像を行な
う。 Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows an embodiment in which the present invention is applied to a developing device having the same shape as that in FIG.
This developing device includes a developing roll 10 and a conveying member 11.
These are both composed of a developing housing 1
It is rotatably supported within 2. Developer is accumulated in the lower part of the developer housing, and this developer is supplied to the developer roll 10 by the conveying member 11. The developing roll 10 is composed of a plurality of fixed magnetic poles 13 and a non-magnetic rotating sleeve 14 surrounding the fixed magnetic poles. It is attracted upward and is conveyed to the development area A along with its rotational movement. A trimmer 15 is arranged in the middle of this conveyance path,
This trimmer adjusts the height of the developer layer to an appropriate value. The developing roll 10 is disposed close to a photoreceptor (not shown) in the development area A, and performs development by supplying developer to the surface of the photoreceptor.
現像ロール１０の表面には、スクレーパ１６の
先端が隣接するように配置されており、現像領域
Ａで現像を行なつた後、残存した現像剤がこのス
クレーパまで搬送される。この際現像剤に働く力
は第３図に示すように重力Ｇ、慣性力ｆ、磁力fM
及び後方からの現像剤ｄによる押圧力fP等が考え
られるが、ここで現像剤の円滑なかき取り動作を
妨げているのは現像ロールのスクレーパ直後にあ
る磁極１３′による磁力であり、小粒径の現像剤
においては慣性力が小さいため、さらにその影響
を強めている。 The front end of a scraper 16 is disposed adjacent to the surface of the developing roll 10, and after development is performed in the developing area A, the remaining developer is conveyed to this scraper. At this time, the forces acting on the developer are gravitational force G, inertial force f, and magnetic force f M as shown in Figure 3.
The pressing force f P caused by the developer d from the rear can be considered, but what prevents the developer from being smoothly scraped off is the magnetic force caused by the magnetic pole 13' located immediately behind the scraper of the developing roll, and the small Since the inertial force is small in the particle-sized developer, the influence is further strengthened.
そこで第２図の実施例では、スクレーパ直後の
磁極１３′と逆極性の磁極を有する磁石１７を磁
極１３′と対向するように設け、現像剤を現像ロ
ール上に引き付ける磁力を弱め、その結果現像剤
のかき取り動作を容易にしている。対向して設け
られた磁石１７の時速密度は、スクレーパ直後の
磁極１３′の磁束密度より弱くしてある。たとえ
ば磁極１３′による磁束密度を400ガウスとするの
に対して対向磁石１７による磁束密度を300ガウ
スとしてあるので、対向した設けられた磁石１７
への現像剤の付着を防止することができ、円滑な
現像剤の循環を得ることができる。 Therefore, in the embodiment shown in FIG. 2, a magnet 17 having a magnetic pole of opposite polarity to the magnetic pole 13' immediately after the scraper is provided to face the magnetic pole 13', thereby weakening the magnetic force that attracts the developer onto the developing roll. This makes it easy to scrape off the agent. The hourly density of the opposing magnets 17 is set to be lower than the magnetic flux density of the magnetic pole 13' immediately behind the scraper. For example, while the magnetic flux density due to the magnetic pole 13' is 400 Gauss, the magnetic flux density due to the opposing magnet 17 is 300 Gauss, so the opposing magnet 17
It is possible to prevent the developer from adhering to the surface and achieve smooth circulation of the developer.
以上、本発明を現像装置に適用した例について
説明したが、上述の現像ロールのような磁気ロー
ルを用いて磁性トナーの清掃を行なう磁気ロール
清掃装置においても同様に適用することができ
る。 Although an example in which the present invention is applied to a developing device has been described above, the present invention can be similarly applied to a magnetic roll cleaning device that cleans magnetic toner using a magnetic roll such as the above-mentioned developing roll.
本発明によれば、磁気ロール表面上に付着した
現像剤をスクレーパ等のかき取り板でかき取る際
に、逆極性の対向磁石を配置して磁気ロールによ
る磁力を弱めているので小粒径の現像剤でも十分
かき取ることができ、円滑な現像剤循環を得るこ
とができる。したがつて現像装置、清掃装置の講
成上の自由度も大幅に増大する。 According to the present invention, when the developer adhering to the surface of the magnetic roll is scraped off with a scraping plate such as a scraper, opposing magnets with opposite polarities are arranged to weaken the magnetic force of the magnetic roll, so that small particles can be removed. Even the developer can be sufficiently scraped off, and smooth developer circulation can be obtained. Therefore, the degree of freedom in designing the developing device and the cleaning device is greatly increased.
なお、本発明のこのような効果は、小粒径の現
像剤において著しく、特に40μ以下のキヤリヤ粒
子を用いた二成分現像剤又は一成分現像剤におい
て最も大きい。 Incidentally, such an effect of the present invention is remarkable in a developer having a small particle size, and is particularly greatest in a two-component developer or a one-component developer using carrier particles of 40 μm or less.
第１図は、従来のかき取り装置を適用した現像
装置の概略断面図、第２図は本発明によるかき取
り装置を適用した現像装置の概略断面図、第３図
は現像剤に加わる力を示すための第２図の部分拡
大図である。
１，１０……現像ロール、２，１１……搬送部
材、３，１３……固定磁石、４，１４……回転ス
リーブ、５，１６……スクレーパ、１２……現像
ハウジング、１３′……スクレーパ直後の磁極、
１５……トリマー、１７……対向磁石、Ａ……現
像領域。
FIG. 1 is a schematic cross-sectional view of a developing device to which a conventional scraping device is applied, FIG. 2 is a schematic cross-sectional view of a developing device to which a scraping device according to the present invention is applied, and FIG. 3 shows the force applied to the developer. FIG. 2 is a partially enlarged view of FIG. 2 for illustrative purposes; 1,10...Developing roll, 2,11...Transporting member, 3,13...Fixed magnet, 4,14...Rotating sleeve, 5,16...Scraper, 12...Developing housing, 13'...Scraper The magnetic pole immediately after,
15...Trimmer, 17...Opposing magnet, A...Development area.
Claims (1)
成るスリーブ回転型の磁気ロール表面に付着した
磁性現像剤をかき取り板によつてかき取る現像剤
かき取り装置において、上記かき取り板直後の磁
極と逆の磁性を有する磁石をそのかき取り板直後
の磁極と対向して配置したことを特徴とする現像
剤かき取り装置。1. In a developer scraping device that uses a scraping plate to scrape off magnetic developer adhering to the surface of a sleeve-rotating magnetic roll consisting of a plurality of fixed magnetic poles and a non-magnetic rotating sleeve, the magnetic pole immediately after the scraping plate and A developer scraping device characterized in that a magnet having opposite magnetism is arranged opposite the magnetic pole immediately behind the scraping plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21102482A JPS59101679A (en) | 1982-12-01 | 1982-12-01 | Developer scraping device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21102482A JPS59101679A (en) | 1982-12-01 | 1982-12-01 | Developer scraping device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59101679A JPS59101679A (en) | 1984-06-12 |
| JPH0447831B2 true JPH0447831B2 (en) | 1992-08-05 |
Family
ID=16599087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21102482A Granted JPS59101679A (en) | 1982-12-01 | 1982-12-01 | Developer scraping device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59101679A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0468374A (en) * | 1990-07-09 | 1992-03-04 | Mita Ind Co Ltd | Manufacture of developing device and developing roller |
| JPH05127537A (en) * | 1991-11-08 | 1993-05-25 | Fujitsu Ltd | Developing device |
-
1982
- 1982-12-01 JP JP21102482A patent/JPS59101679A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59101679A (en) | 1984-06-12 |
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