JPS626230B2 - - Google Patents
Info
- Publication number
- JPS626230B2 JPS626230B2 JP53115252A JP11525278A JPS626230B2 JP S626230 B2 JPS626230 B2 JP S626230B2 JP 53115252 A JP53115252 A JP 53115252A JP 11525278 A JP11525278 A JP 11525278A JP S626230 B2 JPS626230 B2 JP S626230B2
- Authority
- JP
- Japan
- Prior art keywords
- developer
- developing sleeve
- developing
- casing
- latent image
- 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 17
- 239000004020 conductor Substances 0.000 claims description 8
- 108091008695 photoreceptors Proteins 0.000 description 14
- 239000000843 powder Substances 0.000 description 12
- 239000000779 smoke Substances 0.000 description 11
- 239000002245 particle Substances 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003756 stirring 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
Description
【発明の詳細な説明】
本発明は、静電潜像現像装置、詳しくは、内部
に磁石を有する現像スリーブ外周面に現像剤を刷
子状に吸着し、刷子状現像剤によつて静電潜像を
現像する静電潜像現像装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic latent image developing device, more specifically, a developer is attracted to the outer peripheral surface of a developing sleeve having a magnet inside, and the brush-like developer is used to develop an electrostatic latent image. The present invention relates to an electrostatic latent image developing device that develops an image.
磁性キヤリアとトナーとの混合物からなる２成
分磁性現像剤、あるいは、導電性磁性トナーのみ
からなる１成分磁性現像剤を使用した従来の現像
方法における種々の不都合点を解消する現像方法
の一つとして、本出願人の出願に係る特開昭53―
83630号に開示される如き現像方法、即ち、平均
粒径３〜30μｍの絶縁性非磁性トナーと、平均粒
径３〜30μｍ、抵抗率103〜1016Ω・cmの磁性ト
ナーとの混合物とからなる現像剤を使用した新規
な現像方法が提案されている。そしてまた、この
現像方法を実施するのにも適した現像装置とし
て、第１図に示される現像装置が提案されてい
る。この現像装置の概略構成につき以下説明す
る。 As a development method that eliminates various disadvantages of conventional development methods that use a two-component magnetic developer consisting of a mixture of magnetic carrier and toner, or a one-component magnetic developer consisting only of conductive magnetic toner. , Japanese Unexamined Patent Publication No. 1983-1981 filed by the applicant.
83630, that is, a mixture of an insulating non-magnetic toner with an average particle size of 3 to 30 μm and a magnetic toner with an average particle size of 3 to 30 μm and a resistivity of 10 3 to 10 16 Ω·cm. A new developing method using a developer consisting of the following has been proposed. Furthermore, a developing apparatus shown in FIG. 1 has been proposed as a developing apparatus suitable for carrying out this developing method. The general structure of this developing device will be explained below.
第１図において、現像装置１は概略、現像領域
に設置された現像スリーブ２と、現像スリーブ２
内に設けられた磁気ローラ３と、現像槽４を形成
するケーシング５内に設けられた現像剤撹拌・供
給機構６とから構成されている。前記現像スリー
ブ２は、アルミニウム等の非磁性導電材を筒状に
形成してなるもので、反時計方向に回転駆動され
る感光体ドラム７表面に近接対向しており、反時
計方向に約30r.p.mの速度で回転駆動される。前
記磁気ローラ３は、その周囲にＮ極Ｓ極が順次着
磁されてなるロール状のもので、現像スリーブ２
と同方向に2000r.p.mの速度で回転駆動される。
ここで、現像スリーブ２外周面上の現像剤は、現
像スリーブ２の直径を31mmとした場合、磁気ロー
ラ３の回転駆動に伴つて現像スリーブ２と相対的
に時計方向へ約10cm／Ｓの速度の搬送力を受け、
また一方、現像スリーブ２の回転駆動に伴つて反
時計方向に約５cm／Ｓの速度の搬送力を受ける。
従つて、結果的に現像スリーブ２外周面に沿つて
時計方向に約５cm／Ｓの速度で搬送されることと
なる。 In FIG. 1, a developing device 1 schematically includes a developing sleeve 2 installed in a developing area, and a developing sleeve 2.
It is comprised of a magnetic roller 3 provided therein, and a developer agitation/supply mechanism 6 provided in a casing 5 forming a developer tank 4. The developing sleeve 2 is made of a non-magnetic conductive material such as aluminum and is formed into a cylindrical shape. It is rotated at a speed of .pm. The magnetic roller 3 is a roll-shaped roller in which N and S poles are sequentially magnetized around the circumference, and the developing sleeve 2
It is rotated in the same direction at a speed of 2000rpm.
Here, when the diameter of the developing sleeve 2 is 31 mm, the developer on the outer peripheral surface of the developing sleeve 2 moves clockwise at a speed of about 10 cm/s relative to the developing sleeve 2 as the magnetic roller 3 is rotated. Under the conveying force of
On the other hand, as the developing sleeve 2 is rotated, it receives a counterclockwise conveying force at a speed of about 5 cm/s.
Therefore, as a result, the developing sleeve 2 is transported clockwise along the outer peripheral surface at a speed of about 5 cm/s.
また、現像スリーブ２外周面の下部には、可撓
性を有する非磁性材、たとえば適宜合成樹脂材、
あるいは金属等からなる掻取ブレード８ａ，８ｂ
が現像スリーブ２の回転方向に対して対向する順
方向状態で、及び回転方向に追随する逆方向状態
でそれぞれ当接するように支軸８に貼着されてい
る。 The lower part of the outer peripheral surface of the developing sleeve 2 is made of a flexible non-magnetic material, such as an appropriate synthetic resin material.
Or scraping blades 8a, 8b made of metal etc.
is attached to the support shaft 8 so as to abut each other in the forward direction facing the rotation direction of the developing sleeve 2 and in the reverse direction following the rotation direction.
前記構成からなる現像装置において、現像槽４
内に収納された磁性トナーと非磁性トナーとの混
合物からなる現像剤は、現像剤撹拌・供給機構６
によつて混合撹拌されながら前記現像スリーブ２
外周面上に供給され、その後、刷子状に吸着され
た状態で現像スリーブ２外周面に沿つて約５cm／
Ｓの速度で時計方向に搬送され、現像スリーブ２
と感光体ドラム７の対向する現像領域において、
感光体ドラム７表面にあらかじめ形成されている
静電潜像を現像する。 In the developing device having the above configuration, the developing tank 4
The developer consisting of a mixture of magnetic toner and non-magnetic toner stored in the developer stirring/supplying mechanism 6
The developing sleeve 2 is mixed and agitated by
It is supplied onto the outer circumferential surface of the developing sleeve 2, and is then adsorbed in a brush-like manner along the outer circumferential surface of the developing sleeve 2 by approximately 5 cm/min.
The developing sleeve 2 is transported clockwise at a speed of S.
In the developing area facing the photoreceptor drum 7,
The electrostatic latent image previously formed on the surface of the photoreceptor drum 7 is developed.
現像に使用された後の現像剤は、掻取ブレード
８ｂによつて現像スリーブ２外周面上から掻落さ
れ、現像槽４内に戻される。 The developer used for development is scraped off from the outer circumferential surface of the developing sleeve 2 by the scraping blade 8b and returned to the developer tank 4.
前記静電潜像が負極性である場合、磁性トナー
が負の電荷を保持するよう、また、非磁性トナー
が正電荷を保持するようあらかじめ設定されてい
る必要がある。また、現像スリーブ２には現像カ
ブリ（感光体ドラム表面上の非画像部への現像剤
の付着）を抑制するために、静電潜像と同極性の
バイアス電圧が印加されている。 When the electrostatic latent image has negative polarity, it is necessary to set in advance so that the magnetic toner holds a negative charge and the non-magnetic toner holds a positive charge. Further, a bias voltage having the same polarity as the electrostatic latent image is applied to the developing sleeve 2 in order to suppress development fog (adhesion of developer to a non-image area on the surface of the photoreceptor drum).
以上に説明された現像装置は、種々の利点を有
し実用的に優れたものである。しかしながら、前
述の如き磁性トナーと、非磁性トナーとの混合物
からなる現像剤を使用する上において、現像剤の
粉煙発生が顕著であり、それに伴なう種々の弊害
発生がある。具体的には、現像装置外への現像剤
の飛散、漏出、及び現像画像の劣化等である。 The developing device described above has various advantages and is excellent in practical use. However, when using a developer made of a mixture of a magnetic toner and a non-magnetic toner as described above, the generation of powder smoke from the developer is noticeable, and there are various problems associated with this. Specifically, these include scattering and leakage of the developer to the outside of the developing device, and deterioration of the developed image.
この現象につき、前記現像装置を基に詳細に説
明する。 This phenomenon will be explained in detail based on the developing device.
現像スリーブ２外周面上の現像剤が、掻取ブレ
ード８ｂにより掻落される部分について着目する
と、現像剤と掻取ブレード８ｂ先端部との衝突に
より、現像剤掻落し部分で現像剤の粉煙が発生
し、その多くが現像装置外へ、あるいは感光体ド
ラム７表面に向つて直接飛んで行き、種々の弊害
を生じる。また、ここで発生された現像剤の粉煙
の一部は、第２図に示すようにケーシング５の先
端部５ａ付近に静電的に吸着される現象も現われ
る。 Focusing on the part where the developer on the outer circumferential surface of the developing sleeve 2 is scraped off by the scraping blade 8b, developer powder smoke is generated at the part where the developer is scraped off due to the collision between the developer and the tip of the scraping blade 8b. Most of them fly out of the developing device or directly toward the surface of the photoreceptor drum 7, causing various problems. Furthermore, a phenomenon occurs in which part of the developer powder smoke generated here is electrostatically attracted to the vicinity of the tip 5a of the casing 5, as shown in FIG.
これは、負電荷を持つ磁性トナーの粒径、質量
とも小さく、このため掻取ブレード８ｂによつて
現像スリーブ２外周面上より解放された磁性トナ
ーが粉煙状現像剤となつて前記現像スリーブ２と
ケーシング５間に形成されている電位勾配（現像
スリーブには、前述の如く負のバイアス電圧が印
加されており、これに対し、ケーシングは通常零
電位であることにより必然的に形成される電位勾
配）の存在により、磁性トナーがケーシング５に
静電的に付着することによる。前記ケーシング５
の材料としては、合成樹脂等の絶縁材、あるいは
アルミニウム等の導電材が選択的に用いられる
が、両者の場合共に磁性トナーの付着が見られ
る。但し、後者の方がよりその付着量は多い。 This is because the particle size and mass of the magnetic toner having a negative charge are small. Therefore, the magnetic toner released from the outer circumferential surface of the developing sleeve 2 by the scraping blade 8b becomes a smoke-like developer and the developing sleeve 2 and the casing 5 (as mentioned above, a negative bias voltage is applied to the developing sleeve, whereas the casing is normally at zero potential, so this is inevitably formed) This is due to the magnetic toner electrostatically adhering to the casing 5 due to the presence of a potential gradient). Said casing 5
As the material, an insulating material such as synthetic resin or a conductive material such as aluminum is selectively used, but adhesion of magnetic toner is observed in both cases. However, the amount of adhesion is larger in the latter case.
次に、ケーシング先端部５ａに付着した粉煙状
現像剤（磁性トナー）は、その粒径が小さく質量
も小さいため、ケーシング先端部５ａ内壁をころ
がり落て行かず、その大部分は、回転駆動される
磁気ローラ３による磁力の影響を受けケーシング
先端部５ａ内壁を矢印方向（第２図参照）にころ
がりながら移動し、ついにはケーシング５ａと感
光体ドラム７表面との間から漏出すると言う不都
合が生じる。 Next, since the powder smoke-like developer (magnetic toner) attached to the casing tip 5a has a small particle size and small mass, it does not roll down the inner wall of the casing tip 5a, and most of it does not roll down the inner wall of the casing tip 5a. Under the influence of the magnetic force of the magnetic roller 3, the casing tip 5a rolls on the inner wall of the casing in the direction of the arrow (see FIG. 2), and eventually leaks out from between the casing 5a and the surface of the photoreceptor drum 7. arise.
この不都合を軽減するため、ケーシング先端部
５、即ちケーシング５の現像用開口端部を導電材
で構成し、これに現像スリーブ２に印加した電圧
と同じバイアス電圧を印加することにより、現像
スリーブ２とケーシング先端部５ａとの間の電位
勾配を除去することが考えられる。これにより、
以前に比べケーシング先端部５ａへの粉煙状現像
剤（磁性トナー）の付着量を減少することができ
るが、完全にはその付着は防止することができ
ず、このため、依然ケーシング先端部５ａと感光
体ドラム７表面との間からの現像剤の漏出は解消
し得ない。さらには、ケーシング先端部５ａに電
圧印加したことにより、粉煙状現像剤（磁性トナ
ー）がケーシング先端部５ａから静電気的に押し
返され現像スリーブ２とケーシング先端部５ａと
の間を浮遊することとなり、その一部が感光体ド
ラム７表面の非画像部に付着する現象を助長し、
この様なバイアス印加はある意味で好ましくな
い。これは、負極性を持つ磁性トナーが同極性の
バイアス電圧を印加された現像スリーブ２、及び
ケーシング先端部５ａには付着しにくく、このバ
イアス電圧と同極性であり、かつ低電位の電荷を
有する感光体ドラム７表面の非画像部へと付着し
易いからである。 In order to alleviate this inconvenience, the casing tip 5, that is, the development opening end of the casing 5 is made of a conductive material, and by applying the same bias voltage as the voltage applied to the development sleeve 2, the development sleeve 2 It is conceivable to eliminate the potential gradient between and the casing tip 5a. This results in
Although it is possible to reduce the amount of powdered developer (magnetic toner) adhering to the casing tip 5a compared to before, it is not possible to completely prevent the adhesion, and for this reason, the amount of powdered developer (magnetic toner) still remains on the casing tip 5a. The leakage of the developer from between the surface of the photoreceptor drum 7 and the surface of the photoreceptor drum 7 cannot be eliminated. Furthermore, by applying a voltage to the casing tip 5a, the powdered developer (magnetic toner) is electrostatically pushed back from the casing tip 5a and floats between the developing sleeve 2 and the casing tip 5a. This promotes the phenomenon that a part of it adheres to the non-image area on the surface of the photoreceptor drum 7,
In a certain sense, such bias application is undesirable. This is because magnetic toner with a negative polarity is difficult to adhere to the developing sleeve 2 and the casing tip 5a to which a bias voltage of the same polarity is applied, and has the same polarity as this bias voltage and a low potential charge. This is because it tends to adhere to non-image areas on the surface of the photoreceptor drum 7.
本発明は、これら現像剤の粉煙発生に伴なう、
現像装置外への現像剤の飛散・漏出・及び現像画
像の劣化等の問題点に鑑みてなされたものであ
り、現像剤の粉煙発生に伴なう種々の弊害を解消
する現像装置を提供するものである。 The present invention deals with the generation of powder smoke from these developers.
This was done in view of problems such as scattering and leakage of developer outside the developing device and deterioration of developed images, and provides a developing device that eliminates various problems associated with the generation of powder smoke from developer. It is something to do.
上記した目的を達成するために、本発明は、内
部に磁石を有し、静電潜像担体に対向して設けら
れた現像スリーブと、担体上の静電潜像の現像に
使用された後の現像剤を現像スリーブ周面から掻
取る掻取部材とを備えた静電潜像現像装置におい
て、現像用開口を形成する現像装置ケーシングの
先端部と現像スリーブとの間であつて各々に対し
て間隙を持つた状態で、且つ掻取部材の先端部に
対向する位置に導電性部材が設けられているこ
と、及び、前記ケーシング先端部が導電材で形成
されており、ケーシング先端部と導電性部材との
間及び導電性部材と現像スリーブとの間に静電潜
像と同極性の電荷を有する粉煙状現像剤を導電性
部材へ静電吸着させる電位勾配が形成されている
ことを特徴とするものである。 In order to achieve the above-mentioned object, the present invention has a developing sleeve which has a magnet inside and is provided facing an electrostatic latent image carrier, and a developing sleeve which is used for developing an electrostatic latent image on the carrier. In an electrostatic latent image developing device equipped with a scraping member that scrapes off developer from the circumferential surface of the developing sleeve, a portion between the tip of the developing device casing forming the developing opening and the developing sleeve is provided. A conductive member is provided at a position opposite to the tip of the scraping member with a gap between the ends of the scraping member, and the tip of the casing is formed of a conductive material, and the tip of the casing is electrically conductive. A potential gradient is formed between the electrically conductive member and the developing sleeve to electrostatically attract powdered developer having the same polarity as the electrostatic latent image to the electrically conductive member. This is a characteristic feature.
具体的に説明するならば、後述する実施例にお
いては、導電部材として現像剤補集板１０をケー
シング先端部５ａと現像スリーブ２との間で、且
つ掻取ブレード８ｂに対向する位置に設け、この
現像剤補集板１０を接地し、現像スリーブ２とケ
ーシング先端部５ａにバイアス電圧を印加してい
る。 To be more specific, in the embodiment described below, a developer collecting plate 10 is provided as a conductive member between the casing tip 5a and the developing sleeve 2 and at a position facing the scraping blade 8b. This developer collecting plate 10 is grounded, and a bias voltage is applied to the developing sleeve 2 and the casing tip 5a.
本発明は、上述したような構成を備えているか
ら、掻取部材によつて現像スリーブから掻取られ
ることにより発生する静電潜像と同極性の電荷を
有する粉煙状現像剤は、導電部材の障壁作用によ
つて静電潜像担体やケーシング先端部へ向つて直
接飛んで行くのを防止され、また、現像装置内に
浮遊している粉煙現像剤も導電部材に静電吸着さ
れて補集される。 Since the present invention has the above-described configuration, the powdery developer having the same polarity as the electrostatic latent image generated by being scraped off from the developing sleeve by the scraping member is conductive. The barrier effect of the member prevents the developer from flying directly toward the electrostatic latent image carrier or the tip of the casing, and the powder smoke developer floating in the developing device is also electrostatically attracted to the conductive member. It will be supplemented by
以下、本発明に係る静電潜像現像装置の一実施
例につき、第３図を参照しながら説明する。な
お、第３図に示される実施例においては、便宜
上、平均粒径３〜30μｍの絶縁性非磁性トナー
と、平均粒径３〜30μｍ、抵抗率103〜1016Ω・
cmの磁性トナーとの混合物からなる磁性現像剤を
使用した現像装置のみを示すが、他の磁性現像剤
（例えば、前述の１成分あるいは２成分現像剤
等）を使用した場合においても程度の差こそあ
れ、現像剤の粉煙発生に伴なう種々の弊害が存在
する訳であり、これらの現像剤を使用する静電潜
像現像装置としても本発明は有効である。 Hereinafter, one embodiment of the electrostatic latent image developing device according to the present invention will be described with reference to FIG. In the example shown in FIG. 3, for convenience, an insulating non-magnetic toner with an average particle size of 3 to 30 μm, an average particle size of 3 to 30 μm, and a resistivity of 10 3 to 10 16 Ω・
Although only a developing device using a magnetic developer made of a mixture with cm of magnetic toner is shown, there are differences in degree even when other magnetic developers (for example, the aforementioned one-component or two-component developer, etc.) are used. However, there are various disadvantages associated with the generation of powder smoke from developers, and the present invention is also effective in electrostatic latent image developing devices that use these developers.
即ち、トナーとキヤリアとから成る２成分現像
剤を使用した場合には、静電潜像と同極性の電荷
を有するキヤリアが導電性部材に静電吸着され、
また、１成分現像剤を使用した場合には、帯電不
良トナーとして通常の帯電極性とは逆の極性に帯
電するものも少量は存在するために、このような
不良トナーが導電性部材に静電吸着される。 That is, when a two-component developer consisting of toner and carrier is used, the carrier having the same polarity as the electrostatic latent image is electrostatically attracted to the conductive member.
In addition, when a one-component developer is used, there is a small amount of poorly charged toner that is charged to the opposite polarity to the normal charging polarity, so such faulty toner causes electrostatic charge on the conductive member. It is adsorbed.
第３図中、１〜８にて示される部材は、第１図
中に示される部材と略同一機能を果すものであ
り、その詳細説明は略す。 The members indicated by 1 to 8 in FIG. 3 have substantially the same functions as the members shown in FIG. 1, and detailed explanation thereof will be omitted.
合成樹脂からなるケーシング５は、現像槽４を
形成するものであつて、その先端部５ａはアルミ
ニウム等の導電材で構成されている。現像スリー
ブ２には負極性のバイアス電圧が印加されてお
り、ケーシング先端部５ａにも同一のバイアス電
圧が印加されている。なお、、この場合、感光体
ドラム７表面に形成されている静電潜像も負極性
である。１０は現像スリーブ２とケーシング先端
部５ａとの間に設けられた、アルミニウム等の導
電材からなる現像剤補集板であり、接地状態、あ
るいは現像スリーブ２へのバイアス電圧とは逆極
性側のバイアス電圧が印加された状態に維持され
ている。 The casing 5 made of synthetic resin forms the developer tank 4, and its tip 5a is made of a conductive material such as aluminum. A negative bias voltage is applied to the developing sleeve 2, and the same bias voltage is also applied to the casing tip 5a. Note that in this case, the electrostatic latent image formed on the surface of the photoreceptor drum 7 also has negative polarity. Reference numeral 10 denotes a developer collection plate made of a conductive material such as aluminum, which is provided between the developing sleeve 2 and the casing tip 5a, and is in a grounded state or on the opposite polarity side to the bias voltage applied to the developing sleeve 2. A bias voltage is maintained in the applied state.
前記現像装置において、現像に使用された後の
現像剤は、掻取ブレード８ｂによつて現像スリー
ブ２外周面上より掻落され、前記現像剤補集板１
０による障壁作用により、粉煙状現像剤が現像装
置外へ、あるいはケーシング先端部５ａや感光体
ドラム７表面に向つて直接飛んで行くのを防止さ
れつつ現像槽４内に戻される。また、現像装置内
に浮遊している若干量の粉煙状現像剤も、前記現
像剤補集板１０に静電吸着されて補集される。こ
れは、現像スリーブ２、及びケーシング先端部５
ａには負極性のバイアス電圧が印加されているの
に対し、それに対向している現像剤補集板１０が
接地状態、あるいは正極性のバイアス電圧印加の
状態にある場合、その間に形成される電位勾配に
より、静電潜像と同極性の電荷を有する磁性トナ
ー（粉煙状現像剤）が静電的に現像剤補集板１０
に吸着されるためである。 In the developing device, the developer used for development is scraped off from the outer circumferential surface of the developing sleeve 2 by the scraping blade 8b, and then removed from the developer collecting plate 1.
Due to the barrier effect of the developer powder, the smoke-like developer is returned to the developer tank 4 while being prevented from flying out of the developing device or directly toward the casing tip 5a or the surface of the photoreceptor drum 7. Further, a small amount of powdered developer floating in the developing device is also electrostatically attracted to the developer collection plate 10 and collected. This includes the developing sleeve 2 and the casing tip 5.
When a negative bias voltage is applied to a, and the developer collection plate 10 facing it is grounded or a positive bias voltage is applied, the Due to the potential gradient, magnetic toner (powdery developer) having the same polarity as the electrostatic latent image is electrostatically transferred to the developer collecting plate 10.
This is because it is absorbed by
このため、掻落し部分において発生された静電
潜像と同極性の粉煙状現像剤は現像装置外へと飛
散したり、ケーシング先端部５ａには付着するこ
とはなく、また、粉煙状現像剤が感光体ドラム７
表面近傍を浮遊するということもないので、感光
体ドラム７表面の非画像部へ付着して現像カブリ
を生じさせることもない。なお、粉煙現像剤の中
に静電潜像と逆極性のトナーが含まれていたとし
ても、これらのトナーは前述した電位勾配により
ケーシング先端部５ａに付着、あるいは現像スリ
ーブ２周面の磁気刷子状現像剤中に取り込まれる
ため、現像カブリを生じさせることもない。 Therefore, the powdery developer having the same polarity as the electrostatic latent image generated in the scraping portion does not scatter outside the developing device or adhere to the casing tip 5a. The developer is on the photoreceptor drum 7
Since the particles do not float near the surface, they do not adhere to non-image areas on the surface of the photoreceptor drum 7 and cause development fog. Note that even if the powder smoke developer contains toner with a polarity opposite to that of the electrostatic latent image, these toners may adhere to the casing tip 5a due to the potential gradient described above, or be attached to the magnetic field on the circumferential surface of the developing sleeve 2. Since it is incorporated into the brush-like developer, it does not cause development fog.
現像剤補集板１０により、現像剤装置外への現
像剤の飛散、漏出が防止されると言う機能は既に
説明したように、掻取ブレード８ａの存在によつ
て形成された粉煙状現像剤が直接感光体ドラム１
とケーシング先端部５ａとの隔間から飛び出すこ
とを防止する障壁としての働き、及び現像剤補集
板１０の粉煙状現像剤を静電的に吸着する働きに
起因している。 As already explained, the function of the developer collecting plate 10 to prevent the developer from scattering or leaking out of the developer device is to prevent the powdery smoke from being formed due to the presence of the scraping blade 8a. The agent is directly applied to the photoreceptor drum 1.
This is due to the function of the developer collection plate 10 as a barrier to prevent the developer from jumping out from the gap between the developer collecting plate 10 and the casing tip 5a, and the function of the developer collecting plate 10 electrostatically adsorbing the powdery developer.
このようにして、現像剤補集板１０に静電的に
吸着された現像剤は、次に回転駆動される磁気ロ
ーラ３の影響を受け、現像剤補集板１０上を矢印
方向（第４図参照）に移動し、ついには磁気ロー
ラ３の磁力の影響の小さい現像剤補集板１０の後
端部から現像槽４内へと落下される。 In this way, the developer electrostatically attracted to the developer collecting plate 10 is influenced by the magnetic roller 3 which is then rotationally driven, and moves on the developer collecting plate 10 in the direction of the arrow (fourth direction). (see figure), and finally falls into the developer tank 4 from the rear end of the developer collection plate 10 where the magnetic force of the magnetic roller 3 has little influence.
なお、前記実施例においては、現像剤補集板１
０によつて、現像スリーブ２外周面上において搬
送される現像剤の搬送性を損わぬ様に、現像剤補
集板１０と現像スリーブ２との間隙を、現像スリ
ーブ２外周面に刷子状に吸着された現像剤層以上
に設定されている。 In addition, in the above embodiment, the developer collection plate 1
0, the gap between the developer collecting plate 10 and the developing sleeve 2 is formed into a brush-like shape on the outer peripheral surface of the developing sleeve 2 so as not to impair the conveyance of the developer conveyed on the outer peripheral surface of the developing sleeve 2. is set higher than the developer layer adsorbed on the surface.
また、前記現像剤補集板１０が有効に障壁とし
ての機能を果す様に、ケーシング５の現像用開口
部近傍において、現像剤補集板１０が現像スリー
ブ２外周面に吸着されている現像に使用された後
の現像剤を掻落す掻取ブレード８ｂの先端部に対
向する位置に設けられている。 Further, in order that the developer collecting plate 10 effectively functions as a barrier, the developer collecting plate 10 is placed near the developing opening of the casing 5 so that the developer collecting plate 10 is placed near the developing opening of the casing 5. It is provided at a position opposite to the tip of the scraping blade 8b that scrapes off the developer after being used.
また、前記掻取ブレード８ｂによつて掻落され
た現像剤が現像剤補集板１０に衝突せぬ様に、現
像剤補集板１０は、掻落された現像剤の落下通路
外に設けられている。 Further, in order to prevent the developer scraped off by the scraping blade 8b from colliding with the developer collection plate 10, the developer collection plate 10 is provided outside the falling path of the scraped developer. There is.
また、何らかのトラブルにより現像スリーブ２
外周面上において搬送される現像剤と前記現像剤
補集板１０とが衝突したとしても、現像剤の粉煙
が発生されるのを軽減する様に、現像剤補集板１
０の現像剤搬送方向の反対側の端部がナイフエツ
ジ状に形成されている。 Also, due to some trouble, the developing sleeve 2
The developer collecting plate 1 is arranged so as to reduce the generation of developer powder smoke even if the developer conveyed on the outer circumferential surface collides with the developer collecting plate 10.
The end portion on the opposite side of the developer transport direction of the developer is formed into a knife edge shape.
以上の説明から明らかな様に、本発明に係る静
電潜像現像装置によれば、現像剤の粉煙発生に伴
なう種々の弊害は解消される。 As is clear from the above description, the electrostatic latent image developing device according to the present invention eliminates various problems associated with the generation of developer powder smoke.
第１図は、本発明者らによつて提案された静電
潜像現像装置の一例を示す図面、第２図はその要
部拡大図、また、第３図は、本発明に係る静電潜
像現像装置の一実施例を示す図面、第４図は、そ
の要部拡大図である。
２……現像スリーブ、３……磁気ローラ、５…
…ケーシング、５ａ……ケーシング先端部、７…
…感光体ドラム、８ｂ……掻取ブレード、１０…
…現像剤補集板。
FIG. 1 is a diagram showing an example of an electrostatic latent image developing device proposed by the present inventors, FIG. 2 is an enlarged view of the main parts, and FIG. FIG. 4, which is a drawing showing one embodiment of the latent image developing device, is an enlarged view of the main parts thereof. 2...Developing sleeve, 3...Magnetic roller, 5...
...Casing, 5a...Casing tip, 7...
...Photosensitive drum, 8b...Scraping blade, 10...
...Developer collector plate.
Claims (1)
設けられた現像スリーブと、担体上の静電潜像の
現像に使用された後の現像剤を現像スリーブ周面
から掻取る掻取部材とを備えた静電潜像現像装置
において、現像用開口を形成する現像装置ケーシ
ングの先端部と現像スリーブとの間であつて、
各々に対して間隙を持つた状態で、且つ掻取部材
の先端部に対向する位置に導電性部材が設けられ
ていること、及び、前記ケーシング先端部が導電
材で形成されており、ケーシング先端部と導電性
部材との間及び導電性部材と現像スリーブとの間
に静電潜像と同極性の電荷を有する粉煙状現像剤
を導電性部材へ静電吸着させる電位勾配が形成さ
れていることを特徴とする静電潜像現像装置。1 A developing sleeve that has a magnet inside and is provided facing the electrostatic latent image carrier, and a scraper that scrapes off the developer from the circumferential surface of the developing sleeve after it has been used to develop the electrostatic latent image on the carrier. In an electrostatic latent image developing device equipped with a gripping member, between the developing sleeve and the leading end of the developing device casing forming the developing opening,
A conductive member is provided at a position facing the tip of the scraping member with a gap between each, and the tip of the casing is formed of a conductive material, and the tip of the casing is formed of a conductive material. A potential gradient is formed between the conductive member and the conductive member and between the conductive member and the developing sleeve to electrostatically attract powdered developer having the same polarity as the electrostatic latent image to the conductive member. An electrostatic latent image developing device characterized by:
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11525278A JPS5541449A (en) | 1978-09-19 | 1978-09-19 | Electrostatic latent image developing unit |
| US06/074,812 US4338880A (en) | 1978-09-19 | 1979-09-11 | Magnetic brush development apparatus for use in electrophotographic copying machine |
| DE2954323A DE2954323C2 (en) | 1978-09-19 | 1979-09-18 | Magnetic brush developing device for developing an electrostatic charge image |
| DE2937694A DE2937694C2 (en) | 1978-09-19 | 1979-09-18 | Magnetic brush developing device for developing an electrostatic charge image |
| DE19792954440 DE2954440C2 (en) | 1978-09-19 | 1979-09-18 | Magnetic brush developing device for developing an electrostatic charge image |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11525278A JPS5541449A (en) | 1978-09-19 | 1978-09-19 | Electrostatic latent image developing unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5541449A JPS5541449A (en) | 1980-03-24 |
| JPS626230B2 true JPS626230B2 (en) | 1987-02-09 |
Family
ID=14658082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11525278A Granted JPS5541449A (en) | 1978-09-19 | 1978-09-19 | Electrostatic latent image developing unit |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS5541449A (en) |
| DE (1) | DE2954440C2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6232298Y2 (en) * | 1980-06-04 | 1987-08-18 | ||
| US4387982A (en) * | 1981-07-01 | 1983-06-14 | Xerox Corporation | Charged particle containment apparatus |
| US4697914A (en) * | 1982-06-30 | 1987-10-06 | Xerox Corporation | Toner containment method and apparatus |
| KR100739746B1 (en) | 2005-10-25 | 2007-07-13 | 삼성전자주식회사 | Electrophotographic image forming apparatus and developing method thereof |
| KR100726441B1 (en) | 2005-11-22 | 2007-06-11 | 삼성전자주식회사 | Image developing apparatus and image forming apparatus using the same |
| CA2947412C (en) | 2014-04-29 | 2022-05-31 | Corning Incorporated | Abrasive jet forming laminated glass structures |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4331757A (en) * | 1976-12-29 | 1982-05-25 | Minolta Camera Kabushiki Kaisha | Dry process developing method and device employed therefore |
-
1978
- 1978-09-19 JP JP11525278A patent/JPS5541449A/en active Granted
-
1979
- 1979-09-18 DE DE19792954440 patent/DE2954440C2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5541449A (en) | 1980-03-24 |
| DE2954440C2 (en) | 1986-07-03 |
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