JPS59101678A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPS59101678A JPS59101678A JP21102182A JP21102182A JPS59101678A JP S59101678 A JPS59101678 A JP S59101678A JP 21102182 A JP21102182 A JP 21102182A JP 21102182 A JP21102182 A JP 21102182A JP S59101678 A JPS59101678 A JP S59101678A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- foreign matter
- magnetic
- trimmer
- 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.)
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は複写機の現像装置、特に磁性現像剤を磁気的に
吸引し、それをトリミングして現像領域に搬送する現像
剤搬送経路を有する現像装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a developing device for a copying machine, and more particularly to a developing device having a developer conveying path for magnetically attracting magnetic developer, trimming it, and conveying it to a developing area.
このオーの現像装置では、固定磁石と非磁性回転スリー
ブとから成る現像剤搬送ロールを用いて現像剤を吸引し
、この現像剤を搬送している間にトリマ一手段によって
トリミングし、#1.像ロールによって磁気ブラシ等の
穂立の形成を行なって現像軸域におりで+A像を行なう
方法が一般的である。In this O developing device, the developer is sucked in using a developer transport roll consisting of a fixed magnet and a non-magnetic rotating sleeve, and while the developer is being transported, the developer is trimmed by a trimmer means. A common method is to form spikes of magnetic brush or the like using an image roll and then use a cage to perform a +A image in the development axis area.
しかしながら、最近では現像剤の一成分化、又は二成分
現像剤におけるキャリア粒径の小型化(10〜40μm
)に伴ない、穂立の形成が低いことから、現像剤ロール
表面に付着させる現像剤層は薄く維持されている。この
薄層を形成するためにトリマーギャップを狭くする傾向
にあるが、この二次障害として挟込トリマーギャップに
異物(紙粉の固まり、金属破片等)や現像剤粒子同志が
固まったものが詰まり、その箇所において現像剤の搬送
が阻害され、この箇所に相当する部分のコピーに白ぬけ
を発生させることがある。However, recently, developers have become one-component, or the carrier particle size in two-component developers has become smaller (10 to 40 μm).
), and because the formation of spikes is low, the developer layer attached to the developer roll surface is kept thin. There is a tendency to narrow the trimmer gap in order to form this thin layer, but a secondary problem is that foreign matter (paper dust, metal fragments, etc.) or developer particles that have solidified together can clog the trimmer gap. , the conveyance of the developer is obstructed at that location, and white spots may occur in the copy of the portion corresponding to this location.
本発明は、このような従来技術における欠点に鑑みてな
されたもので、その目的は、−成分又は二成分の磁性現
像剤を用いる。EJI像装置において、正常な現像剤以
外の異物、現像剤のかたまり等によるトリマ一部の詰ま
りを防止することである。The present invention has been made in view of the shortcomings in the prior art, and its purpose is to use a one-component or two-component magnetic developer. In an EJI image device, the purpose is to prevent a part of the trimmer from clogging due to foreign matter other than normal developer, developer clumps, etc.
すなわち、本発明は、現像装置の現像剤吸引部分とトリ
ミング部分との間の現像剤搬送路中に同極反発磁極部を
設けることによシ、異物、現像剤の固まり等を除去し、
これらがトリマーギャップに詰まることを防止している
。この同極反発磁極部では、同極性の磁極が隣接して設
けられているので、磁界が形成されず、したがって紙粉
の固まシ等の非磁性異物や、現像剤粒子の固まりのよう
な重量の大きな物は、現像搬送路から除去される。That is, the present invention removes foreign objects, developer lumps, etc. by providing a same-polarity repelling magnetic pole part in the developer conveyance path between the developer suction part and the trimming part of the developing device.
This prevents these from clogging the trimmer gap. In this same-polarity repulsion magnetic pole section, magnetic poles of the same polarity are provided adjacently, so no magnetic field is formed, and therefore non-magnetic foreign matter such as paper dust particles or developer particle clumps can be detected. Objects that are heavy are removed from the development conveyance path.
ところが正常の現像剤粒子は重量が比較的軽くかつ搬送
運動の慣性力にも助けられて同極反発磁極部を飛び越え
て隣接磁界に捕獲されてさらに搬送され続ける。However, normal developer particles are relatively light in weight, and with the help of the inertia of the conveying motion, they jump over the same-polarity repelling magnetic pole, are captured by the adjacent magnetic field, and continue to be conveyed.
このようにして本発明では、正常な現像剤の搬送を維持
しつつ、現像剤中に含首れる異物や現像剤粒子同志の固
まりを除去することができる。In this manner, in the present invention, it is possible to remove foreign matter contained in the developer and agglomerates of developer particles while maintaining normal conveyance of the developer.
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。銅1図を参照すると、感光体ドラム1に隣接して現
像ノ・ウジング2が配置されており、この現像ノ・ウジ
ング内には、ツクドルホイール3、搬送ロール4、現像
ロール5がそれぞれ矢印の方向に回転回部に設けられて
いる。/ぞドルホイール3ば、現像ノ・ウジングの下部
に蓄積した磁性現像剤を搬送ロール4に供給するもので
あり、搬送ロール4は、その吸引部分Aにおいて現像剤
を磁気的に引き付けて現像ロール5まで搬送するもので
あシ、現像ロール5は、搬送ロール4から現像剤を受取
シ、その現像剤を感光体1と隣接する現像領域Bに通過
せしめることにより、感光体表面に形成されている静電
溜像を現像するものである。Embodiments of the present invention will be described below with reference to the drawings. Referring to Figure 1, a developing housing 2 is arranged adjacent to the photoreceptor drum 1, and within this developing housing, a developing wheel 3, a transport roll 4, and a developing roll 5 are indicated by arrows. It is provided in the rotating part in the direction of . /zodle wheel 3 supplies the magnetic developer accumulated at the bottom of the developing roller to the conveying roll 4, and the conveying roll 4 magnetically attracts the developer at its suction portion A and transfers it to the developing roller. 5, the developing roll 5 receives the developer from the transport roll 4, and passes the developer through the developing area B adjacent to the photoreceptor 1, thereby forming the developer on the surface of the photoreceptor. It is used to develop the electrostatic image that is present.
搬送ロール4、現像ロール5はいずれも固定磁極とその
まわシに回転する非磁性回転スリーブとで構成され、現
像剤を磁気的に引き付けた状態で図示するように搬送す
る。これによって現像剤吸引部分Aから現像領域Bまで
の間に現像剤搬送経路が形成される。この現像剤搬送経
路中には、トリマー6が配置されておシ、とのトリマー
6によって現像ロール表面上に付着する現像剤の層の高
さが制御され、現像領域において適正な量の現像剤を感
光体表面に供給することができる。この現像装置では、
現像剤吸引部分Aとトリマー6が配置されたトリミング
部分Cとの間に異物除去部分りが形成されている。Both the conveying roll 4 and the developing roll 5 are composed of a fixed magnetic pole and a non-magnetic rotating sleeve that rotates around the fixed magnetic pole, and convey the developer while magnetically attracting it. As a result, a developer transport path is formed between the developer suction portion A and the development area B. A trimmer 6 is disposed in this developer transport path, and the trimmer 6 controls the height of the layer of developer deposited on the surface of the developing roll, so that an appropriate amount of developer is deposited in the developing area. can be supplied to the surface of the photoreceptor. In this developing device,
A foreign matter removal portion is formed between the developer suction portion A and the trimming portion C where the trimmer 6 is disposed.
この異物除去部分りでは、隣接する固定磁極が同極性と
なっており、磁界は形成されない。このため、吸引部分
Aから搬送されてきた現像剤に含まれる紙粉の固まシ等
の非磁性異物や、金属破片や現像剤の固まり等の磁性体
であっても重量の大きなものは、重力作用を受けて落下
し、現像剤搬送路すなわち搬送ローラ表面から除去され
る。ところが正常な現像剤は比較的重量が小さく、搬送
ローラ4による搬送運動の慣性力にも助けられて異物除
去部分りを飛び越えて隣接する磁界に捕獲されるため現
像剤搬送路から外れることがない。In this foreign matter removal area, adjacent fixed magnetic poles have the same polarity and no magnetic field is formed. For this reason, non-magnetic foreign objects such as hardened paper powder contained in the developer conveyed from the suction part A, and magnetic objects such as metal fragments and developer clumps, which have a large weight, It falls under the action of gravity and is removed from the developer transport path, that is, the surface of the transport roller. However, normal developer has a relatively small weight, and with the help of the inertia of the transport movement by the transport roller 4, it jumps over the foreign object removal area and is captured by the adjacent magnetic field, so it does not come off the developer transport path. .
第2図に示す例では、搬送ローラが省略されておシ、パ
ドルホイール3から供給された現像剤は・直接現像ロー
ル4の吸引部分に引き付けられ、トリミング部分Cにお
いてトリミングされた後、現像領域Bに供給される。ま
た、この実施例では、異物除去部分の下方に異物受は箱
7を設け、これに異物を収容するようにしであるため、
第1図に示す実施例に比べ、異物が再び現像ハウジング
下部に蓄積することがなく、信頼性が増大する。In the example shown in FIG. 2, the conveyance roller is omitted, and the developer supplied from the paddle wheel 3 is directly attracted to the suction part of the developing roll 4, trimmed at the trimming part C, and then removed from the developing area. B is supplied. In addition, in this embodiment, a box 7 is provided as a foreign object receptacle below the foreign object removal part, and the foreign object is stored in this box.
Compared to the embodiment shown in FIG. 1, foreign matter will not accumulate again at the bottom of the developer housing, increasing reliability.
第1図及び第2図に示す実施例に共通する%徴は、異物
除去部分、すなわち反発磁極部を磁性ロールの下部に配
置し、重力によシ非磁性異物又は重量の大きな現像剤の
固まシ等を磁性ロール表面に形成された現像剤層の搬送
中に離脱する点である。これらの実施例でに、上記反発
磁極部の同極間の距離が大きくなる程、異物除去効果は
高くなるが、この距離が余り大きくなると現像剤の搬送
に障害が発生してぐる。したがってこの同極間距離は、
それ程大きくできないのであるが、第3図に示すように
反発磁極部に障壁を設置することにより、狭い同極性距
離でも比較的高い異物除去効果を得ることができる。第
3図に示す例では、現像ロール40表面に現像剤搬送路
A −* C−> 8が形成されており、その途中にあ
る異物除去部分において現像剤の非磁性体スリーブ4′
に@接して軸方向にわたって現像剤層より厚さの薄い非
磁性体バー8が設置されている。この実施例では、現像
剤は異物除去部分を飛び越える途中でこのバーに衝突し
、よりかき乱されるので、異物がより効果的に除去され
る。The percentage characteristics common to the embodiments shown in FIGS. 1 and 2 are that the foreign matter removal part, that is, the repelling magnetic pole part is placed at the bottom of the magnetic roll, and non-magnetic foreign matter or heavy developer is solidified by gravity. This is the point where the stains and the like come off during the conveyance of the developer layer formed on the surface of the magnetic roll. In these embodiments, the greater the distance between the same poles of the repelling magnetic pole portions, the higher the foreign matter removal effect, but if this distance becomes too large, problems will occur in the conveyance of the developer. Therefore, this homopolar distance is
Although it cannot be made that large, by installing a barrier at the repulsion magnetic pole portion as shown in FIG. 3, a relatively high foreign matter removal effect can be obtained even with a narrow copolarity distance. In the example shown in FIG. 3, a developer conveying path A-*C->8 is formed on the surface of the developing roll 40, and a non-magnetic sleeve 4' for the developer is formed at a part of the path where foreign matter is removed.
A non-magnetic bar 8 having a thickness thinner than the developer layer is installed in contact with the developer layer in the axial direction. In this embodiment, the developer collides with this bar on its way over the foreign matter removal section and is more agitated, so that foreign matter is removed more effectively.
以上述べたように、本発明では現像剤搬送経路の現像剤
吸引部分とトリミング部分との間にPl極性反発磁極部
を設けることにより異物等を除去できるのでトリマーギ
ャップにこれらの異物が結着るような不都合が解消され
、したがってコピーの白ぬけ問題も排除式れる。As described above, in the present invention, foreign matter can be removed by providing a Pl-polarity repelling magnetic pole section between the developer suction part and the trimming part of the developer transport path, so that the foreign matter can be prevented from sticking to the trimmer gap. Therefore, the problem of white spots on copies can also be eliminated.
第1図は本発明の現像装置の第1実施例を示す概略図、
第2図は本発明の現像装置の第2実施例を示す概略図、
第3図は本発明の現像装置の第3実施例を示す概略図で
ある。FIG. 1 is a schematic diagram showing a first embodiment of the developing device of the present invention;
FIG. 2 is a schematic diagram showing a second embodiment of the developing device of the present invention;
FIG. 3 is a schematic diagram showing a third embodiment of the developing device of the present invention.
Claims (1)
像領域に搬送する現像剤搬送経路の前記吸引部分と前記
トリミング部分との間に同極反発磁極部を設けたことを
特徴とする現像装置〇A developing device characterized in that a same-polarity repelling magnetic pole portion is provided between the attracting portion and the trimming portion of a developer conveying path that magnetically attracts magnetic developer, trims it, and conveys it to a developing area. Equipment〇
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21102182A JPS59101678A (en) | 1982-12-01 | 1982-12-01 | Developing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21102182A JPS59101678A (en) | 1982-12-01 | 1982-12-01 | Developing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS59101678A true JPS59101678A (en) | 1984-06-12 |
Family
ID=16599033
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21102182A Pending JPS59101678A (en) | 1982-12-01 | 1982-12-01 | Developing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59101678A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6134571A (en) * | 1984-07-26 | 1986-02-18 | Fuji Xerox Co Ltd | One-component developing device |
US5802430A (en) * | 1996-04-22 | 1998-09-01 | Kabushiki Kaishi Toshiba | Image forming apparatus having means for adsorbing impurities contained in the toner returned by the recycling mechanism |
-
1982
- 1982-12-01 JP JP21102182A patent/JPS59101678A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6134571A (en) * | 1984-07-26 | 1986-02-18 | Fuji Xerox Co Ltd | One-component developing device |
JPH0528382B2 (en) * | 1984-07-26 | 1993-04-26 | Fuji Xerox Co Ltd | |
US5802430A (en) * | 1996-04-22 | 1998-09-01 | Kabushiki Kaishi Toshiba | Image forming apparatus having means for adsorbing impurities contained in the toner returned by the recycling mechanism |
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