JPS63101874A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPS63101874A JPS63101874A JP24733886A JP24733886A JPS63101874A JP S63101874 A JPS63101874 A JP S63101874A JP 24733886 A JP24733886 A JP 24733886A JP 24733886 A JP24733886 A JP 24733886A JP S63101874 A JPS63101874 A JP S63101874A
- Authority
- JP
- Japan
- Prior art keywords
- developing device
- wall
- photoreceptor
- tip
- air
- 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.)
- Granted
Links
- 108091008695 photoreceptors Proteins 0.000 claims description 35
- 238000011109 contamination Methods 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 10
- 238000005452 bending Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Dry Development In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、電子写真複写機等の機内汚れの一因となるト
ナークラウドをエア吸引システムにより吸引するように
した現像装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a developing device that uses an air suction system to suck up toner clouds that cause dirt inside an electrophotographic copying machine or the like.
１迷Ｊと１量
電子写真複写機の乾式現像装置においては、トナークラ
ウドによる機内汚れの問題があるが、このトナークラウ
ドを防止する手段としては、エアポケット方式（第５図
）、マグネットシール方式（第６図）、サクション方式
（第７図）等がある。In the dry developing devices of 1st grade J and 1st quantity electrophotographic copying machines, there is a problem of internal contamination due to toner cloud, but methods to prevent this toner cloud include the air pocket method (Figure 5) and the magnetic seal method. (Fig. 6), suction method (Fig. 7), etc.
エアポケット方式は、第５図のように、図示矢印方向に
回転する感光体１に対向する現像ロール２のハウジング
３の先端上流部３ａと先端下流部３ｂに、感光体１に近
接するエアポケット４を設け、このエアポケット４をエ
アフローの淀み部とし、ハウジング３内部のトナーが現
像器の外部に漏れるのを防止している。As shown in FIG. 5, the air pocket method includes air pockets close to the photoreceptor 1 at the upstream end 3a and downstream end 3b of the housing 3 of the developing roll 2, which faces the photoreceptor 1 rotating in the direction of the arrow in the figure. 4 is provided, and this air pocket 4 is used as an air flow stagnation part to prevent the toner inside the housing 3 from leaking to the outside of the developing device.
マグネットシール方式は、第６図のように、二成分磁性
現像剤等を用いる場合、現像器のハウジング３の感光体
１に近接する端部に永久磁石５を設け、この永久磁石５
に現像剤Ｔを接触させることにより、トナーの現像器外
部への漏れを防止している。As shown in FIG. 6, in the magnetic seal method, when a two-component magnetic developer or the like is used, a permanent magnet 5 is provided at the end of the housing 3 of the developing device close to the photoreceptor 1.
By bringing the developer T into contact with the toner, leakage of toner to the outside of the developing device is prevented.
サクション方式は、第７図のように、ハウジングとして
の現像器内壁７−と現像器外壁８とでエア吸引通路９を
形成し、内壁先端７ａと感光体１の間のトナークラウド
をエア吸引通路９に矢印方向に吸引することにより、ト
ナーの現像器外部への漏れを防止している。特開昭５８
−２１１７７０号に図示される現像装置においても同様
にエア吸引方式を採用している。In the suction method, as shown in FIG. 7, an air suction passage 9 is formed by an inner wall 7- of the developing unit as a housing and an outer wall 8 of the developing unit, and the toner cloud between the inner wall tip 7a and the photoreceptor 1 is removed through the air suction passage. By suctioning the toner in the direction of the arrow 9, leakage of toner to the outside of the developing device is prevented. Japanese Unexamined Patent Publication 1983
The developing device illustrated in No. 211770 also employs the air suction system.
発明が解決しようとする問題、
しかしながら、上述したトナークラウド防止手段は、そ
れぞれ次のような問題点を有しており、このうちのエア
ポケット方式は、エアポケット４を設けているため現像
器が大型化し、マグネットシール方式では、複数色の現
像器をもつ場合に感光体１上のトナー像が混色するとい
う問題がある。Problems to be Solved by the Invention However, each of the above-mentioned toner cloud prevention means has the following problems. Among them, the air pocket method has the air pocket 4, so the developing device The magnetic seal method has a problem in that the toner images on the photoreceptor 1 are mixed in color when a plurality of color developing devices are used.
またサクション方式では、現像器の内壁先端７ａにトナ
ーが堆積しやすく、感光体１上の画像をあらすおそれが
ある。この点について詳述すると、まずトナーがなぜ壁
面に堆積しろるかに関してであるが、現像器内壁７ａが
アルミ等の金属製の場合、現像器中のトナークラウドは
、自らの電荷と内壁７から受ける鏡像力で内壁７に付着
し、さらに、現像剤の特性上、現像器内壁７を電気的に
浮かせた構成にする場合、トナークラウドの壁面付着が
一層著しくなる。そこにエア吸引が加わると、現像器内
のトナークラウドは強制的に内壁先端７ａと感光体１と
の間を通過させられるわけで、エア吸引がない場合に比
べ内壁先端７ａへのトナー付着の機会が加速度的に増え
る。しかも、エア吸引が無いと内壁先端７ａに堆積する
トナーの帯電分布は、現像器内のトナークラウドの帯電
分布に近いのに比べ、エア吸引が加わると、帯電ｍの低
いものはエアフローに乗ってエア吸引通路９へ吸引され
やすいため、内壁先端７ａに付着するトナーは帯電量の
高いものの割合が多くなり、感光体１上の画像をあらし
やすい。これは、現像器内のトナークラウドを強制的に
外部に吸い出しているためで、エア吸引１が多いほど内
壁先端７ａのトナー堆積は顕著である。Furthermore, in the suction method, toner tends to accumulate on the inner wall tip 7a of the developing device, which may cause the image on the photoreceptor 1 to become blurred. To explain this point in detail, first of all, as to why toner accumulates on the wall surface, if the inner wall 7a of the developing device is made of metal such as aluminum, the toner cloud in the developing device is formed by its own electric charge and from the inner wall 7. The toner cloud adheres to the inner wall 7 due to the mirror image force it receives, and if the inner wall 7 of the developing device is electrically floated due to the characteristics of the developer, the toner cloud adheres to the wall surface even more significantly. When air suction is applied, the toner cloud in the developing device is forced to pass between the inner wall tip 7a and the photoreceptor 1, and the toner is less likely to adhere to the inner wall tip 7a than in the case where there is no air suction. Opportunities are increasing rapidly. Moreover, when there is no air suction, the charge distribution of the toner deposited on the inner wall tip 7a is close to the charge distribution of the toner cloud in the developing device, but when air suction is added, toner with a low charge m rides on the air flow. Since the toner is easily sucked into the air suction passage 9, a large proportion of the toner adhering to the inner wall tip 7a has a high charge amount, and the image on the photoreceptor 1 is likely to be distorted. This is because the toner cloud in the developing device is forcibly sucked out to the outside, and the more air suction 1 there is, the more significant the toner accumulation on the inner wall tip 7a is.
本発明は、このような問題点に鑑みなされたもので、ト
ナークラウドによる複写機の機内汚れを防止するととも
に、現像器内のトナークラウドを感光体“側の現像器内
壁先端を経由してのエアを現像器の外部へ吸引しすぎな
いようにし、感光体上の画像の乱れを防ぐことを目的と
する。The present invention was developed in view of these problems, and it prevents toner cloud from contaminating the inside of a copying machine, and also prevents the toner cloud from flowing inside the developing device through the tip of the inner wall of the developing device on the side of the photoreceptor. The purpose is to prevent too much air from being sucked out of the developing device and to prevent the image on the photoreceptor from being disturbed.
同 点を解決するための 段
前記目的を達成するために、本発明の現像装置は、感光
体に対向する現像ロールにハウジングを設け、ハウジン
グは現像器内壁と現像器外壁とから構成し、現像器内壁
と現像器外壁の間をエアを吸引するエア吸引通路とし、
現像器外壁先端部と感光体との間隙距離を現像器内壁先
端部と感光体とのｎｇｔ距離よりも大に設定する。In order to achieve the above object, the developing device of the present invention provides a housing for the developing roll facing the photoreceptor, the housing is composed of an inner wall of the developing device and an outer wall of the developing device; An air suction passage for sucking air is formed between the inner wall of the container and the outer wall of the developing device.
The gap distance between the tip of the outer wall of the developer and the photoreceptor is set to be larger than the ngt distance between the tip of the inner wall of the developer and the photoreceptor.
本発明の望ましい実／ｌｌ！ｉ態様としては、前記現像
器内壁先端部を現像器内側方向に折曲する。Desirable fruits of the present invention/ll! In the i aspect, the tip of the inner wall of the developing device is bent toward the inner side of the developing device.
作 用
本発明によれば、エア吸引通路からエアを吸引すると、
現像器内壁及び現像器外壁と感光体との閂から現像器内
部及び現像器外部からのエアがエア吸引通路に吸引され
るのであるが、この場合現像器外壁先端部と感光体との
間隙距離が現像器内壁先端部と感光体との間隙距離より
も大に設定されていることから、現像器内部からのエア
吸引ａが現像器外部のエア吸引量よりも相対的に低下す
る。従って、現像器内部のエアないしトナークラウドを
エア吸引通路を通じて程良く外部に排出し、これにより
現像器内壁先端に付着するトを−を低減し、感光体上へ
の不必要なトナー付着が防止され、感光体上の画像の乱
れを防止する。According to the present invention, when air is sucked from the air suction passage,
Air from inside and outside the developer is sucked into the air suction passage through the bolts between the inner wall of the developer, the outer wall of the developer, and the photoreceptor.In this case, the gap distance between the tip of the outer wall of the developer and the photoreceptor is is set to be larger than the gap distance between the tip of the inner wall of the developing device and the photoreceptor, so the amount of air suction a from inside the developing device is relatively lower than the amount of air suction from outside the developing device. Therefore, the air or toner cloud inside the developing device is adequately discharged to the outside through the air suction passage, thereby reducing the amount of toner that adheres to the tip of the inner wall of the developing device, and preventing unnecessary toner from adhering to the photoreceptor. This prevents the image on the photoreceptor from being distorted.
以下本発明の実施例を図面に基づいて説明する。Embodiments of the present invention will be described below based on the drawings.
実施例 １
第１図及び第２図は、本発明の第１の実施例を示してい
る。第１図おいて、第７図と実質的に同一の構成部分に
ついては同一符号を付すことにする。Embodiment 1 FIGS. 1 and 2 show a first embodiment of the present invention. In FIG. 1, components that are substantially the same as those in FIG. 7 are given the same reference numerals.
現像ロール２のハウジングは、現像器内壁１２とその外
側に設けられる現像器外壁８とから形成され、これらの
現像器内壁１２と現像器外壁１３との間にエアを図示矢
印方向に吸引するエア吸引通路１４が形成されている。The housing of the developing roll 2 is formed of an inner developing wall 12 and an outer developing wall 8 provided on the outside of the inner wall 12, and there is an air gap between the inner wall 12 and the outer wall 13 for sucking air in the direction of the arrow in the figure. A suction passage 14 is formed.
エアを吸引する手段は、例えば図示しないバキュームポ
ンプを用いる。As a means for sucking air, for example, a vacuum pump (not shown) is used.
現像器内壁１２及び現像器外壁１３のそれぞれの先端と
感光体１との距離は、第２図に示すように、現像器内壁
先端１２ａと感光体１との距離ｒ１よりも現像器外壁先
端１３ａと感光体１との距１１１ｒ２を大きな値に設定
し、これにより現像器外部のエアを現像器内部のエアよ
りも相対的に多く吸引し、結果的に現像器内部からのエ
ア吸引量を低減する。As shown in FIG. 2, the distance between the tip of each of the developing device inner wall 12 and the developing device outer wall 13 and the photoreceptor 1 is longer than the distance r1 between the developing device inner wall tip 12a and the photoreceptor 1. The distance 111r2 between the developing device and the photoreceptor 1 is set to a large value, thereby sucking relatively more air from outside the developing device than air inside the developing device, and as a result, reducing the amount of air sucked from inside the developing device. do.
第１の実施例において、第２図に示す点Ａの位置の風速
を０．２〜０．６ｍ／ｓｅｃとしチェ７１７）吸引を行
なったところ、ｒ２がｒｌの２倍ないし４倍までの範囲
で、機内汚れはほとんど生じず、感光体１上に良好な画
像が得られた。In the first embodiment, when suction was performed with the wind speed at the position of point A shown in FIG. Therefore, there was almost no staining inside the machine, and a good image was obtained on the photoreceptor 1.
第１の実施例におけるｒｌの値は、０．５〜４履さらに
好ましくは０．５〜２ｔｔｍに設定し、ｒ２の値ｔよｒ
ｌ＜ｒ２の関係を保ちつつ、１〜１０ａｗｍさらに好ま
しくは１〜５麿に設定する。The value of rl in the first embodiment is set to 0.5 to 4 ttm, more preferably 0.5 to 2ttm, and the value of r2 is set to ttm.
While maintaining the relationship l<r2, it is set to 1 to 10 awm, more preferably 1 to 5 awm.
実施例 ２
第３図及び第４図は、本発明の第２の実施例を示してい
る。第３図において、第７図と実質的に同一の構成部分
については同一の符号を付すことにする。Embodiment 2 FIGS. 3 and 4 show a second embodiment of the present invention. In FIG. 3, components that are substantially the same as those in FIG. 7 are given the same reference numerals.
現像ロール２のハウジングは、現像器内壁１６とその外
側に設けられる現像器外壁１７とから形成され、これら
の現像器内壁１６と現＠器外壁１７との間に図示矢印方
向にエアを吸引するエア吸引通路１８が形成されている
。The housing of the developing roll 2 is formed of an inner wall 16 of the developing device and an outer wall 17 of the developing device provided on the outside thereof, and sucks air between the inner wall 16 of the developing device and the outer wall 17 of the developing device in the direction of the arrow shown in the figure. An air suction passage 18 is formed.
現像器内壁１６の感光体１との近接部は、現像器内側方
向に曲折され、この曲折部１６ａは、第４図のように、
曲折部１６ａの長さノが現像剤の穂立ちに干渉しない程
度まで延長されている。A portion of the inner wall 16 of the developing device close to the photoreceptor 1 is bent toward the inner side of the developing device, and this bent portion 16a is formed as shown in FIG.
The length of the bent portion 16a is extended to the extent that it does not interfere with the spikes of the developer.
第４図において、感光体１と曲折付根部との距ｌ１１ｒ
１と感光体１と折曲先端部との距離ｒ２をほぼ同じ値と
なる構成とし、第４図に示す点へでの風速を０．５ｍ／
ｓｅｃとしてエアの吸引を行なったところ、現像ロール
２による感光体１上への現像に当り、感光体１上に良好
な画像を得ることができ、且つ現像器外部のトナークラ
ウドによる汚れもほとんど生じなかった。なお、現像器
内壁１６と曲折部１６ａとの角度θは、９０ａ〜１２０
度の範囲に設定するのが望ましい。In FIG. 4, the distance l11r between the photoreceptor 1 and the bending base is
1, the distance r2 between the photoreceptor 1 and the bending tip are set to approximately the same value, and the wind speed at the point shown in FIG. 4 is set to 0.5 m/
When air was suctioned as sec, it was possible to obtain a good image on the photoreceptor 1 during the development on the photoreceptor 1 with the developing roll 2, and there was almost no dirt due to the toner cloud outside the developer. There wasn't. Note that the angle θ between the inner wall 16 of the developing device and the bent portion 16a is between 90a and 120a.
It is desirable to set it within the range of
第２の実施例では、距１１１ｆｉｒ１と距離ｒ２を等し
い値に設定したが、本発明としては、ｒｌ＞ｒ２となる
ように設定し、折曲付根部から折曲先端部にいくに従い
感光体との距離が次第に小さくなるように設定しても良
い。In the second embodiment, the distance 111fir1 and the distance r2 were set to the same value, but in the present invention, they are set so that rl>r2, and the photoreceptor increases from the bending base to the bending tip. The distance may be set so that it gradually becomes smaller.
第２の実施例によれば、現ｍｓ内壁１６の感光体側先端
を現像器１側方向に折曲し、これにより現像器内側から
のエア吸引量を現像器外部からのエア吸引量よりも低減
させることにより、現像器内のトナークラウドを現像器
外部へ吸引しすぎないようにし、すなわち現像器内部で
自然発生したトナークラウドのみを除去するようにし、
感光体１上への不必要なトナー付着を防止することがで
きる。第３図の実施例では、現像器内壁１６の先端部に
曲折部１６ａを形成する構成となっているため、ハウジ
ングの組立性も向上する。According to the second embodiment, the tip of the inner wall 16 on the photoreceptor side is bent toward the side of the developing device 1, thereby reducing the amount of air sucked from inside the developing device compared to the amount of air sucked from outside the developing device. By doing so, the toner cloud inside the developing device is prevented from being excessively sucked to the outside of the developing device, that is, only the toner cloud naturally generated inside the developing device is removed.
Unnecessary toner adhesion onto the photoreceptor 1 can be prevented. In the embodiment shown in FIG. 3, the bent portion 16a is formed at the tip of the inner wall 16 of the developing device, so that the ease of assembling the housing is improved.
なお本発明は、感光体とハウジングとの間の間隙から現
像器内部のトナークラウドを外部にエア吸引により排出
するようにしているが、現像器のハウジングにおける現
像器内壁の感光体側に空孔を設け、この空孔よりエアの
吸引を行ない、現像器内部のトナークラウドを除去する
ようにしても良い。In the present invention, the toner cloud inside the developing device is discharged to the outside by air suction from the gap between the photoreceptor and the housing. The toner cloud inside the developing device may be removed by suctioning air through the holes.
発明の詳細
な説明したように、本発明によれば、トナークラウドに
よる複写機の機内汚れを防出すると共に、現像器内壁に
付着するトナーを低減し、感光体上の画像の乱れを確実
に防ぐことができる。As described in detail, according to the present invention, it is possible to prevent the inside of a copying machine from being contaminated due to toner cloud, reduce toner adhering to the inner wall of the developing device, and ensure that the image on the photoreceptor is not disturbed. It can be prevented.
第１図は本発明の第１の実施例をあられす概略構成図、
第２図はその要部を説明するため要部概略構成図、
第３図は本発明の第２実施例をあられす概略構成図、
第４図はその要部をあられす要部概略側面図、第５図、
第６図、および第７図は従来例をあられす概略構成図で
ある。
１・・・感光体、 ２・・・現像ロール、１２
・・・現像器内壁、
１２ａ・・・現像器外壁先端部、
１３・・・現像器外壁、
１３ａ・・・現像器外壁先端部、
１４・・・エア吸引通路、 １６・・・現像器内壁、
１６ａ・・・曲折部、 １７・・・現像器外壁、１
８・・・エア吸引通路。Fig. 1 is a schematic diagram showing the first embodiment of the present invention, Fig. 2 is a schematic diagram showing the main part to explain the main parts, and Fig. 3 is a schematic diagram showing the second embodiment of the invention. Schematic configuration diagram, Figure 4 is a schematic side view of the main parts, Figure 5 is a schematic side view of the main parts,
FIGS. 6 and 7 are schematic configuration diagrams showing conventional examples. 1... Photoreceptor, 2... Developing roll, 12
... Inner wall of the developer, 12a... Tip of the outer wall of the developer, 13... Outer wall of the developer, 13a... Tip of the outer wall of the developer, 14... Air suction passage, 16... Inner wall of the developer ,
16a...Bending portion, 17...Developer outer wall, 1
8...Air suction passage.
Claims (2)
、ハウジングを現像器内壁と現像器外壁とから構成し、
現像器内壁と現像器外壁の間をエアを吸引するエア吸引
通路とした現像装置において、現像器外壁先端部と感光
体との間隙距離を現像器内壁先端部と感光体との間隙距
離よりも大に設定したことを特徴とする現像装置。(1) A housing is provided on the developing roll facing the photoconductor, and the housing is composed of an inner wall of the developer and an outer wall of the developer,
In a developing device with an air suction passage that sucks air between the inner wall of the developer and the outer wall of the developer, the gap distance between the tip of the outer wall of the developer and the photoreceptor is set to be smaller than the distance between the tip of the inner wall of the developer and the photoreceptor. A developing device characterized in that it is set to a large size.
されていることを特徴とする特許請求の範囲第１項記載
の現像装置。(2) The developing device according to claim 1, wherein the tip of the inner wall of the developing device is bent toward the inner side of the developing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24733886A JPS63101874A (en) | 1986-10-20 | 1986-10-20 | Developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24733886A JPS63101874A (en) | 1986-10-20 | 1986-10-20 | Developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63101874A true JPS63101874A (en) | 1988-05-06 |
| JPH0582945B2 JPH0582945B2 (en) | 1993-11-24 |
Family
ID=17161921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24733886A Granted JPS63101874A (en) | 1986-10-20 | 1986-10-20 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63101874A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5474756A (en) * | 1977-11-28 | 1979-06-15 | Ricoh Co Ltd | Electrophotographic copier |
| JPS55113061A (en) * | 1979-02-24 | 1980-09-01 | Konishiroku Photo Ind Co Ltd | Scattering toner collector |
| JPS5792354A (en) * | 1980-11-28 | 1982-06-08 | Canon Inc | Dust collection device |
| JPS57115572A (en) * | 1981-01-09 | 1982-07-19 | Konishiroku Photo Ind Co Ltd | Developer |
| JPS6095559A (en) * | 1983-10-31 | 1985-05-28 | Toshiba Corp | Developing device |
-
1986
- 1986-10-20 JP JP24733886A patent/JPS63101874A/en active Granted
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5474756A (en) * | 1977-11-28 | 1979-06-15 | Ricoh Co Ltd | Electrophotographic copier |
| JPS55113061A (en) * | 1979-02-24 | 1980-09-01 | Konishiroku Photo Ind Co Ltd | Scattering toner collector |
| JPS5792354A (en) * | 1980-11-28 | 1982-06-08 | Canon Inc | Dust collection device |
| JPS57115572A (en) * | 1981-01-09 | 1982-07-19 | Konishiroku Photo Ind Co Ltd | Developer |
| JPS6095559A (en) * | 1983-10-31 | 1985-05-28 | Toshiba Corp | Developing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0582945B2 (en) | 1993-11-24 |
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