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
Application number
JP59155918A
Other languages
Japanese (ja)
Other versions
JPS6134571A (en
Inventor
Takashi Yamamuro
Yoshio Shoji
Nobuo Momotake
Takayuki Sunaga
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.)
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox Co Ltd
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 Fuji Xerox Co Ltd filed Critical Fuji Xerox Co Ltd
Priority to JP15591884A priority Critical patent/JPS6134571A/en
Publication of JPS6134571A publication Critical patent/JPS6134571A/en
Publication of JPH0528382B2 publication Critical patent/JPH0528382B2/ja
Granted legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/06Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/09Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
    • G03G15/0921Details 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.

〔従来の技術〕[Conventional technology]

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.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

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.

〔問題点を解決するための手段及び作用〕[Means and actions for solving problems]

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 °.

〔実施例〕〔Example〕

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
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.

〔発明の効果〕〔Effect of the invention〕

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.

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

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)

【特許請求の範囲】[Claims] 1 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°.
JP15591884A 1984-07-26 1984-07-26 One-component developing device Granted JPS6134571A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
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

Similar Documents

Publication Publication Date Title
JPH0528382B2 (en)
UST959003I4 (en) Electrostatic process development apparatus
JP2791792B2 (en) Developing device having fixed magnet assembly
JPH0256580A (en) Developing device
JPS6250864A (en) Developing device
JPS60146277A (en) Developing device by one component magnetic toner
JPS61124054U (en)
JPS55138768A (en) Developing device for magnetic toner
JPS5691266A (en) Developing device
JPS61200563A (en) Developing device
JPS57116374A (en) Developing device
JPS62205385A (en) Developing device
JPS5553338A (en) Developing method of electrostatic latent image
JPS61170763A (en) Developing device
JPS5876868A (en) Magnetic brush device
JPS60153070A (en) Magnetic brush developing roller
JPS6230273A (en) Developing device for copying machine
JPS59147369A (en) Developing device
JPS55100575A (en) Magnetic brush developing roll
JPS59168760U (en) developing device
JPS5647051A (en) Developing method in multiple sheet copying method
JPS56137372A (en) Developing device
JPS5811767U (en) Magnetic brush developing device equipped with toner particle supply mechanism
JPS63115157U (en)
JPS5876867A (en) Developing device