JPH0528382B2 - - Google Patents
Info
- Publication number
- JPH0528382B2 JPH0528382B2 JP59155918A JP15591884A JPH0528382B2 JP H0528382 B2 JPH0528382 B2 JP H0528382B2 JP 59155918 A JP59155918 A JP 59155918A JP 15591884 A JP15591884 A JP 15591884A JP H0528382 B2 JPH0528382 B2 JP H0528382B2
- Authority
- JP
- Japan
- Prior art keywords
- developer
- magnetic
- magnetic pole
- developing roller
- developing
- 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 - Lifetime
Links
- 230000001105 regulatory effect Effects 0.000 claims description 25
- 238000009966 trimming Methods 0.000 claims description 24
- 230000004907 flux Effects 0.000 claims description 9
- 230000032258 transport Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 description 7
- 230000002730 additional effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000004519 manufacturing process Methods 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
- G03G15/0921—Details concerning the magnetic brush roller structure, e.g. magnet configuration
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、一成分磁性現像剤用現像装置、特に
一成分磁性現像剤を収容するための現像剤溜め
と、該現像剤溜めから磁性現像剤を引き付けて現
像領域まで搬送する現像ローラと、該現像ローラ
内部に配置されて現像ローラ表面に磁界を形成す
る複数の磁極を有する磁石と、現像ローラに隣接
して配置され該現像ローラ表面上の現像剤量を規
制するための規制部材とから成る一成分現像装置
に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a developing device for a one-component magnetic developer, particularly a developer reservoir for accommodating a one-component magnetic developer, and a developer reservoir for storing a magnetic developer from the developer reservoir. a developing roller that attracts and transports the agent to the developing area; a magnet that is disposed inside the developing roller and has a plurality of magnetic poles that forms a magnetic field on the surface of the developing roller; and a magnet that is disposed adjacent to the developing roller and that forms a magnetic field on the surface of the developing roller. and a regulating member for regulating the amount of developer.
この種の一成分現像装置では、第５図に示すよ
うに現像ローラ１の内部に配置された磁石２の磁
極は対称的若しくは非対照的に配置されかつＮ
極、Ｓ極が交互に配置されていた。現像ローラ１
上の現像剤３は、現像剤規制部材４で規制され穂
立ちを形成した後、現像主極N1で現像され、そ
の際未使用の現像剤は現像剤溜め５に戻される。
一方現像剤溜め５内の新しい現像剤３は攪拌棒６
で攪拌されて現像ローラ１に送り込まれる。
In this type of one-component developing device, as shown in FIG.
The poles and south poles were arranged alternately. Developing roller 1
The upper developer 3 is regulated by the developer regulating member 4 to form spikes, and then developed by the main developing pole N 1 , and at this time, unused developer is returned to the developer reservoir 5 .
On the other hand, the new developer 3 in the developer reservoir 5 is mixed with the stirring rod 6.
The toner is agitated and sent to the developing roller 1.
しかしながら、従来の一成分現像装置では、Ｎ
極、Ｓ極が交互に配置された磁石２を用いている
ので、現像領域７から戻された未使用の現像剤が
この交互に配置された磁極による磁界によつて現
像ローラ１の表面に引付けられたままで再度現像
領域へ送り込まれる。そのため、500枚ないし
1500枚のコピーを作成するうちに新しい現像剤と
未使用の残存現像剤との混合が不十分となり、濃
度低下を招くという問題があつた。さらに磁石２
のＮ極、Ｓ極が交互に配置されておりかつその強
さもほぼ同じなので（第５図及び第６図参照）現
像ローラ１の表面から現像剤規制部材４によつて
除去された現像剤が、現像剤規制部材４近傍の磁
極S3とそれに隣接した磁極N3との間に形成され
た磁界によつて現像剤規制部材４の裏側に付着堆
積し、これが現像ローラによつて搬送される現像
剤に応力を与える。この結果、現像剤の劣化が生
じ、前述の場合と同様に経時による濃度低下を招
くという問題があつた。
However, in the conventional one-component developing device, N
Since the magnets 2 in which the poles and south poles are arranged alternately are used, the unused developer returned from the developing area 7 is attracted to the surface of the developing roller 1 by the magnetic field caused by the magnetic poles arranged alternately. It is sent to the developing area again with the film still attached. Therefore, 500 pieces or more
After making 1,500 copies, there was a problem in that the new developer and unused residual developer were insufficiently mixed, resulting in a decrease in density. Furthermore, magnet 2
Since the N and S poles are arranged alternately and their strengths are almost the same (see FIGS. 5 and 6), the developer removed by the developer regulating member 4 from the surface of the developing roller 1 is , is deposited on the back side of the developer regulating member 4 due to the magnetic field formed between the magnetic pole S 3 near the developer regulating member 4 and the magnetic pole N 3 adjacent thereto, and is transported by the developing roller. Apply stress to the developer. As a result, the developer deteriorates, causing the problem of a decrease in density over time, similar to the case described above.
一成分磁性現像剤を収容するための現像剤溜め
と、該現像剤溜めから磁性現像剤を引き付けて現
像領域まで搬送する現像ローラと、該現像ローラ
内部に配置されて現像ローラ表面に磁界を形成す
る複数の磁極を有する磁石と、現像ローラに隣接
して配置され該現像ローラ表面上の現像剤量を規
制するための規制部材とから成る一成分現像装置
において、前記磁石の複数の磁極のうち前記規制
部材近傍のトリミング磁極と該トリミング磁極と
隣接しており前記現像剤溜め内の一成分磁性現像
剤を磁気的に吸引するキヤツチアツプ磁極とを同
極性とし、前記トリミング磁極を前記規制部材と
前記現像領域との間に配置し、前記トリミング磁
極と前記キヤツチアツプ磁極の磁束密度を50ガウ
スないし1000ガウスとし、前記トリミング磁極と
前記キヤツチアツプ磁極との相対位置が前記ロー
ラの軸を中心として30°〜150°の角度範囲内にあ
ることを特徴とする。
A developer reservoir for accommodating a one-component magnetic developer, a developing roller that attracts the magnetic developer from the developer reservoir and transports it to the development area, and is arranged inside the developer roller to form a magnetic field on the surface of the developer roller. In a one-component developing device comprising a magnet having a plurality of magnetic poles, and a regulating member disposed adjacent to a developing roller for regulating the amount of developer on the surface of the developing roller, one of the plurality of magnetic poles of the magnet A trimming magnetic pole near the regulating member and a catch-up magnetic pole adjacent to the trimming magnetic pole that magnetically attracts the one-component magnetic developer in the developer reservoir are made to have the same polarity, and the trimming magnetic pole is connected to the regulating member and the catch-up magnetic pole. The trimming magnetic pole and the catch up magnetic pole have a magnetic flux density of 50 Gauss to 1000 Gauss, and the relative position of the trimming magnetic pole and the catch up magnetic pole is 30° to 150° with respect to the axis of the roller. It is characterized by being within an angular range of °.
第１図に本発明の実施例である一成分現像装置
を示す。この実施例では、第５図に示した磁石２
の磁極N3を除去しかつ現像剤規制部材近傍の磁
極すなわちトリミング磁極S3を現像主極N1の方
へずらして配置している。その他の構成は第５図
の現像装置と同じである。このように第１図の現
像装置では現像溜め５内の攪拌棒６に隣接してい
る現像ローラ１の表面に反発磁界を形成するよう
に、上記トリミング磁極S3に隣接するキヤツチア
ツプ磁極S2を前記トリミング磁極S3と同極性にし
ている。このトリミング磁極S3とキヤツチアツプ
磁極S2は、その表面磁束密度がいずれも800ガウ
スに設定されている（第２図参照）。またトリミ
ング磁極S3は、現像剤規制部材４と現像主極N1
との間において、現像ローラ１を中心として現像
主極N1との間の相対角度が17°となるような位置
に配置されており、一方キヤツチアツプ磁極S2は
前記トリミング磁極S3に対する相対角度が105°と
なるような位置に配置されている。
FIG. 1 shows a one-component developing device which is an embodiment of the present invention. In this embodiment, the magnet 2 shown in FIG.
The magnetic pole N3 of the developer regulating member is removed, and the magnetic pole near the developer regulating member, that is, the trimming magnetic pole S3 , is shifted toward the main developing pole N1 . The other configurations are the same as the developing device shown in FIG. In this manner, in the developing device shown in FIG. 1, the catch up magnetic pole S2 adjacent to the trimming magnetic pole S3 is arranged so as to form a repulsive magnetic field on the surface of the developing roller 1 adjacent to the stirring rod 6 in the developer reservoir 5 . It has the same polarity as the trimming magnetic pole S3 . The surface magnetic flux density of both the trimming magnetic pole S3 and the catch up magnetic pole S2 is set to 800 Gauss (see Fig. 2). In addition, the trimming magnetic pole S3 is connected to the developer regulating member 4 and the main developing pole N1.
The main developing pole N1 is located at a relative angle of 17° with the developing roller 1 at the center, while the catch up magnetic pole S2 is located at a relative angle of 17° with respect to the trimming magnetic pole S3 . is placed at a position such that the angle is 105°.
第１図の実施例ではこれらの磁極はいずれもＳ
極であるが、もちろんＮ極としてもよい。またそ
の表面磁束密度の大きさは同じであつてもよく又
はわずかに異なつていてもよい。なお、トリミン
グ磁極S3とキヤツチアツプ磁極S2との位置関係
は、トリミング磁極S3が上述したように現像剤規
制部材４と現像主極N1との間に配置され、この
トリミング磁極S3に対して現像ローラ２の回転軸
を中心として30°〜150°の角度範囲にキヤツチア
ツプ磁極S2が配置されていることが好ましい。 In the embodiment of FIG. 1, both of these magnetic poles are S.
Although it is a pole, it may of course be a north pole. Further, the magnitude of the surface magnetic flux density may be the same or may be slightly different. The positional relationship between the trimming magnetic pole S 3 and the catch up magnetic pole S 2 is such that the trimming magnetic pole S 3 is arranged between the developer regulating member 4 and the main developing pole N 1 as described above, and the trimming magnetic pole S 3 On the other hand, it is preferable that the catch up magnetic pole S2 is arranged in an angular range of 30° to 150° with respect to the rotation axis of the developing roller 2.
第１図に示した現像装置では、現像領域７で現
像されずに現像ローラ１の表面に付着したままの
現像剤は、上記反発磁界によつて確実に現像ロー
ラ表面から除去され、攪拌棒６によつて新しい現
像剤と混合された後現像ローラ表面へ再供給され
る。またトリミング磁極S3が現像剤規制部材４と
現像主極N1との間に配置されているので現像ロ
ーラ表面へ再供給された現像剤が現像剤規制部材
４の裏側に付着堆積することなく現像領域７に搬
送される。 In the developing device shown in FIG. 1, the developer remaining attached to the surface of the developing roller 1 without being developed in the developing area 7 is reliably removed from the surface of the developing roller 1 by the repulsive magnetic field. After being mixed with new developer by the developer, the developer is re-supplied to the surface of the developer roller. In addition, since the trimming magnetic pole S 3 is arranged between the developer regulating member 4 and the main developing pole N 1 , the developer re-supplied to the surface of the developing roller does not adhere and accumulate on the back side of the developer regulating member 4 . It is transported to the development area 7.
第３図は、本発明の別の実施例を示したもの
で、この実施例では、攪拌棒６に近接した磁極
N2は、トリミング磁極S3と異極性であるが、そ
の相対角度が大きく設定されている。このように
して両磁極間に、現像ローラ表面の現像剤保持力
の弱い部分を形成する。この現像剤保持力の弱い
部分の表面磁束密度は、第４図に示すように50ガ
ウスである。この実施例では、現像領域７で現像
されずに現像ローラ表面上に残留した現像剤は、
前記現像剤保持力の弱い部分から除去されて攪拌
棒で新しい現像剤と混合される。 FIG. 3 shows another embodiment of the invention, in which a magnetic pole near the stirring bar 6 is shown.
N2 has a different polarity from the trimming magnetic pole S3 , but the relative angle thereof is set to be large. In this way, a portion of the developing roller surface having a weak developer holding power is formed between the two magnetic poles. The surface magnetic flux density of this portion where the developer holding power is weak is 50 Gauss as shown in FIG. In this embodiment, the developer remaining on the surface of the developing roller without being developed in the developing area 7 is
The developer is removed from the area where the developer holding power is weak and mixed with new developer using a stirring rod.
本発明によれば、現像剤溜め内の攪拌棒６に隣
接した現像ローラ表面に反発磁界又は現像剤保持
力の弱い部分が形成されるので、現像領域で現像
されずに残つた未使用の現像剤が現像ローラ表面
から除去され、現像剤溜め内で新しい現像剤と混
合される。またトリミング磁極が現像剤規制部材
と現像領域との間に配置されているので、現像ロ
ーラによつて搬送される現像剤が現像剤規制部材
の裏側に付着堆積することがない。したがつて現
像剤溜め内の攪拌棒で混合されて現像ローラ表面
に供給された現像剤は、現像剤規制部材の下方を
通過する際、何ら悪影響を受けることがない。ま
た、前記トリミング磁極と前記キヤツチアツプ磁
極の磁束密度を50ガウスないし1000ガウスとし、
前記トリミング磁極と前記キヤツチアツプ磁極と
の相対位置が前記ローラの軸を中心として30°〜
150°の角度範囲内にあるように設定されているの
で、従来技術における再現濃度の経時変化を生ず
ることなく、常に適正な再現濃度を得ることがで
きる。さらに、本発明の付加的な効果としては、
従来の現像ローラに比べて磁極数が減るので製造
コストの低減を図ることができる。
According to the present invention, a repulsive magnetic field or a portion with weak developer holding power is formed on the surface of the developing roller adjacent to the stirring rod 6 in the developer reservoir, so that unused developer remaining undeveloped in the developing area The developer is removed from the developer roller surface and mixed with fresh developer in the developer sump. Further, since the trimming magnetic pole is disposed between the developer regulating member and the developing area, the developer transported by the developing roller does not adhere to and accumulate on the back side of the developer regulating member. Therefore, the developer mixed by the stirring rod in the developer reservoir and supplied to the surface of the developing roller is not adversely affected at all when passing under the developer regulating member. Further, the magnetic flux density of the trimming magnetic pole and the catch up magnetic pole is set to 50 Gauss to 1000 Gauss,
The relative position of the trimming magnetic pole and the catch up magnetic pole is 30° to 30° with respect to the axis of the roller.
Since the angle is set to be within the angular range of 150°, it is possible to always obtain an appropriate reproduced density without causing the change in reproduced density over time in the conventional technology. Furthermore, as an additional effect of the present invention,
Since the number of magnetic poles is reduced compared to conventional developing rollers, manufacturing costs can be reduced.
第１図は本発明の第１実施例である一成分現像
装置の断面図、第２図は第１図における現像ロー
ラ周面上の複数磁極による表面磁束密度を表わす
グラフ、第３図は本発明の第２実施例である一成
分現像装置の断面図、第４図は第３図における現
像ローラ周面上の複数磁極による表面磁束密度を
表わすグラス、第５図は従来の一成分現像装置の
断面図、第６図は第５図における現像ローラ周面
上の複数磁極による表面磁束密度を表わすグラフ
である。
１……現像ローラ、２……固定磁石、３……現
像剤、４……現像剤規制部材、５……現像剤溜
め、６……攪拌棒、７……現像領域。
FIG. 1 is a cross-sectional view of a one-component developing device according to the first embodiment of the present invention, FIG. 2 is a graph showing the surface magnetic flux density due to multiple magnetic poles on the circumferential surface of the developing roller in FIG. 1, and FIG. A cross-sectional view of a one-component developing device according to a second embodiment of the invention, FIG. 4 is a glass showing the surface magnetic flux density due to a plurality of magnetic poles on the circumferential surface of the developing roller in FIG. 3, and FIG. 5 is a cross-sectional view of a conventional one-component developing device. FIG. 6 is a graph showing the surface magnetic flux density due to the plurality of magnetic poles on the circumferential surface of the developing roller in FIG. DESCRIPTION OF SYMBOLS 1...Developing roller, 2...Fixed magnet, 3...Developer, 4...Developer regulating member, 5...Developer reservoir, 6...Stirring bar, 7...Developing area.
Claims (1)
めと、該現像剤溜めから磁性現像剤を引き付けて
現像領域まで搬送する現像ローラと、該現像ロー
ラ内部に配置されて現像ローラ表面に磁界を形成
する複数の磁極を有する磁石と、現像ローラに隣
接して配置され該現像ローラ表面上の現像剤量を
規制するための規制部材とから成る一成分現像装
置において、前記磁石の複数の磁極のうち前記規
制部材近傍のトリミング磁極と該トリミング磁極
と隣接しており前記現像剤溜め内の一成分磁性現
像剤を磁気的に吸引するキヤツチアツプ磁極とを
同極性とし、前記トリミング磁極を前記規制部材
と前記現像領域との間に配置し、前記トリミング
磁極と前記キヤツチアツプ磁極の磁束密度を50ガ
ウスないし1000ガウスとし、前記トリミング磁極
と前記キヤツチアツプ磁極との相対位置が前記ロ
ーラの軸を中心として30°〜150°の角度範囲内に
あることを特徴とする一成分現像装置。1. A developer reservoir for containing a one-component magnetic developer, a developing roller that attracts the magnetic developer from the developer reservoir and transports it to a developing area, and a developing roller that is disposed inside the developing roller and applies a magnetic field to the surface of the developing roller. In a one-component developing device comprising a magnet having a plurality of magnetic poles forming a plurality of magnetic poles, and a regulating member disposed adjacent to a developing roller for regulating the amount of developer on the surface of the developing roller, the plurality of magnetic poles of the magnet Among them, a trimming magnetic pole near the regulating member and a catch-up magnetic pole adjacent to the trimming magnetic pole that magnetically attracts the one-component magnetic developer in the developer reservoir are made to have the same polarity, and the trimming magnetic pole and the regulating member are of the same polarity. The trimming magnetic pole and the catch up magnetic pole are arranged between the development area, and have a magnetic flux density of 50 Gauss to 1000 Gauss, and a relative position of the trimming magnetic pole and the catch up magnetic pole is 30° to 30° with respect to the axis of the roller. A one-component developing device characterized by an angle range of 150°.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15591884A JPS6134571A (en) | 1984-07-26 | 1984-07-26 | One-component developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15591884A JPS6134571A (en) | 1984-07-26 | 1984-07-26 | One-component developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6134571A JPS6134571A (en) | 1986-02-18 |
| JPH0528382B2 true JPH0528382B2 (en) | 1993-04-26 |
Family
ID=15616355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15591884A Granted JPS6134571A (en) | 1984-07-26 | 1984-07-26 | One-component developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6134571A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07107618B2 (en) * | 1986-05-15 | 1995-11-15 | ミノルタ株式会社 | Development device |
| JPH0753086Y2 (en) * | 1986-09-16 | 1995-12-06 | キヤノン株式会社 | Development device |
| JPS6465585A (en) * | 1987-09-04 | 1989-03-10 | Sharp Kk | Developing device for copying machine |
| JPH01217485A (en) * | 1988-02-26 | 1989-08-31 | Canon Inc | Developing device |
| JPH02220084A (en) * | 1989-02-22 | 1990-09-03 | Ricoh Co Ltd | Two-component developing device |
| JP3731981B2 (en) * | 1997-08-26 | 2006-01-05 | シャープ株式会社 | Developing device for image forming apparatus |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5730874A (en) * | 1980-07-31 | 1982-02-19 | Fuji Xerox Co Ltd | Method and device for electrophotographic copying |
| JPS59101678A (en) * | 1982-12-01 | 1984-06-12 | Fuji Xerox Co Ltd | Developing device |
-
1984
- 1984-07-26 JP JP15591884A patent/JPS6134571A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5730874A (en) * | 1980-07-31 | 1982-02-19 | Fuji Xerox Co Ltd | Method and device for electrophotographic copying |
| JPS59101678A (en) * | 1982-12-01 | 1984-06-12 | Fuji Xerox Co Ltd | Developing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6134571A (en) | 1986-02-18 |
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