JP5315760B2 - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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JP5315760B2
JP5315760B2 JP2008105356A JP2008105356A JP5315760B2 JP 5315760 B2 JP5315760 B2 JP 5315760B2 JP 2008105356 A JP2008105356 A JP 2008105356A JP 2008105356 A JP2008105356 A JP 2008105356A JP 5315760 B2 JP5315760 B2 JP 5315760B2
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developing roller
developer
developing
image forming
forming apparatus
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JP2009258260A (en
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健 木下
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Konica Minolta Inc
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Description

本発明は、複写機，プリンタ，ファクシミリ及びこれらの複合機などの画像形成装置に係り、現像剤を収容させた現像ハウジングの開口部の位置において、感光体と所要間隔を介して対向するように設けられた現像ローラを回転駆動させて、この現像ローラにより現像剤を感光体と対向する現像領域に導き、感光体に形成された静電潜像を現像する場合に、現像剤におけるトナーが現像装置と感光体との間から外部に飛散するのを確実に防止できるようにした点に特徴を有するものである。   The present invention relates to an image forming apparatus such as a copying machine, a printer, a facsimile machine, and a composite machine of these, so as to face a photoconductor through a required interval at a position of an opening of a developing housing containing a developer. When the developing roller provided is rotated and the developing roller guides the developer to a developing area facing the photoreceptor, and the electrostatic latent image formed on the photoreceptor is developed, the toner in the developer is developed. It is characterized in that it can be reliably prevented from scattering from between the apparatus and the photoreceptor.

従来から、複写機，プリンタ，ファクシミリ及びこれらの複合機などの画像形成装置においては、一般に、現像装置に設けられた現像ローラにより現像剤を感光体と対向する現像領域に搬送し、この現像ローラから感光体に現像剤におけるトナーを供給して、感光体に形成された静電潜像を現像するようにしている。   Conventionally, in an image forming apparatus such as a copying machine, a printer, a facsimile, and a composite machine of these, the developer is generally conveyed to a developing area facing the photosensitive member by a developing roller provided in the developing device. Then, the toner in the developer is supplied to the photoconductor to develop the electrostatic latent image formed on the photoconductor.

ここで、このような画像形成装置の一つとして、例えば、図１に示すような現像装置１０を用いて、感光体１に形成された静電潜像を現像するようにしたものが用いられている。   Here, as one of such image forming apparatuses, for example, an apparatus in which an electrostatic latent image formed on the photoreceptor 1 is developed using a developing apparatus 10 as shown in FIG. 1 is used. ing.

ここで、この画像形成装置における現像装置１０においては、トナーとキャリアを含む２成分の現像剤Ｄが収容された現像ハウジング１１の開口部１１ａの位置において、内周側にマグネット部材１２ａが固定して設けられた現像ローラ１２を上記の感光体１と所要間隔を介して対向するように設け、また現像ハウジング１１内に隔壁１３を介して２つの搬送路１４ａ，１４ｂを設けると共に、各搬送路１４ａ，１４ｂ内に搬送部材１５ａ，１５ｂを設け、各搬送部材１５ａ，１５ｂにより現像ハウジング１１内に収容された現像剤Ｄを混合攪拌しながら各搬送路１４ａ，１４ｂを搬送させて循環させると共に、現像ローラ１２側の搬送路１４ａにおいて現像剤Ｄを現像ローラ１２に供給するようにしている。   Here, in the developing device 10 in this image forming apparatus, the magnet member 12a is fixed to the inner peripheral side at the position of the opening 11a of the developing housing 11 in which the two-component developer D including toner and carrier is accommodated. The developing roller 12 is provided so as to face the above-described photosensitive member 1 with a predetermined interval, and two transport paths 14a and 14b are provided in the development housing 11 via a partition wall 13, and each transport path is provided. Conveying members 15a and 15b are provided in 14a and 14b, and the respective conveying paths 14a and 14b are conveyed and circulated while mixing and stirring the developer D accommodated in the developing housing 11 by the conveying members 15a and 15b. The developer D is supplied to the developing roller 12 in the conveyance path 14a on the developing roller 12 side.

そして、上記の現像装置１０を用いて感光体１に形成された静電潜像を現像するにあたっては、上記の現像ローラ１２を回転させて、この現像ローラ１２に供給された現像剤Ｄを磁気ブラシの状態で搬送させ、この現像ローラ１２によって搬送される現像剤Ｄの量を規制部材１６により規制した後、この現像ローラ１２により所定量の現像剤Ｄを感光体１と所要間隔を介して対向する現像領域に導いて現像を行うようにしている。なお、この現像装置１０においては、感光体１と現像ローラ１２とが対向する位置において、感光体１と現像ローラ１２とが逆方向に移動するように、感光体１と現像ローラ１２とを同方向に回転させるようにしているが、感光体１と現像ローラ１２とが同方向に移動するように、感光体１と現像ローラ１２とを逆方向に回転させるようにしたものも用いられている。   When developing the electrostatic latent image formed on the photoreceptor 1 using the developing device 10, the developing roller 12 is rotated and the developer D supplied to the developing roller 12 is magnetized. After being conveyed in the state of a brush and the amount of the developer D conveyed by the developing roller 12 is regulated by the regulating member 16, a predetermined amount of the developer D is separated from the photoreceptor 1 by a predetermined interval by the developing roller 12. The development is conducted by leading to the opposite development areas. In the developing device 10, the photosensitive member 1 and the developing roller 12 are the same so that the photosensitive member 1 and the developing roller 12 move in opposite directions at a position where the photosensitive member 1 and the developing roller 12 face each other. Although the photosensitive member 1 and the developing roller 12 are rotated in the opposite directions so that the photosensitive member 1 and the developing roller 12 are moved in the same direction, there are also used ones. .

ここで、上記のように現像ローラ１２により所定量の現像剤Ｄを感光体１と所要間隔を介して対向する現像領域に導いて現像を行うようにした場合、現像ローラ１２の回転に伴う空気の流れにより、現像剤Ｄ中におけるトナーが現像装置１０と感光体１との隙間から外部に飛散して画像形成装置内が汚れるという問題があった。   Here, when the developing roller 12 guides a predetermined amount of the developer D to the developing area facing the photosensitive member 1 through a required interval as described above, the air accompanying the rotation of the developing roller 12 is used. This causes a problem that the toner in the developer D is scattered outside through the gap between the developing device 10 and the photosensitive member 1 and the inside of the image forming apparatus becomes dirty.

このため、従来においては、例えば、特許文献１に示されるように、現像ローラの回転方向下流側の開口部に現像ローラの軸方向に沿った下流シール部材を設けると共に、現像ローラの軸方向両側における開口部に端部シールを設け、現像剤中におけるトナーが現像装置と感光体との隙間から外部に飛散するのを抑制するようにしたものが提案されている。   For this reason, conventionally, for example, as shown in Patent Document 1, a downstream seal member is provided along the axial direction of the developing roller at the downstream side in the rotation direction of the developing roller, and both axial sides of the developing roller are provided. Has been proposed in which an end seal is provided at the opening of the toner to prevent the toner in the developer from scattering from the gap between the developing device and the photoreceptor.

ここで、上記のように現像ローラの軸方向両側における開口部に端部シールを設けるにあたり、従来においては、現像ローラによって搬送される現像剤に端部シールが接触しないように、現像ローラの現像剤搬送領域から離れた両側の開口部の位置に端部シールを設けるようにしていた。   Here, in providing the end seals at the openings on both sides in the axial direction of the developing roller as described above, conventionally, the developing roller has been developed so that the end seal does not contact the developer conveyed by the developing roller. The end seals are provided at the positions of the openings on both sides away from the agent transport area.

しかし、このように端部シールを現像ローラの現像剤搬送領域から離れた開口部の位置に設けた場合、現像ローラの回転に伴う空気の流れが、現像剤が存在していない現像ローラと端部シールとの間に流れ込み、現像ローラの軸方向両側における現像装置と感光体との隙間を通して、現像剤中におけるトナーが外部に飛散するという問題が依然として存在した。
特開２００７−１６４０２１号公報 However, when the end seal is provided at the position of the opening portion away from the developer transport area of the developing roller in this way, the air flow accompanying the rotation of the developing roller causes the end of the developing roller where the developer is not present to end. There still remains a problem that the toner in the developer scatters to the outside through the gap between the developing device and the photoconductor on both sides in the axial direction of the developing roller.
JP 2007-164021 A

本発明は、現像装置に設けられた現像ローラにより現像剤を感光体と対向する現像領域に搬送し、この現像ローラから感光体に現像剤におけるトナーを供給して感光体に形成された静電潜像を現像するようにした画像形成装置における上記のような問題を解決することを課題とするものである。   In the present invention, the developer is conveyed to a developing region facing the photosensitive member by a developing roller provided in the developing device, and toner in the developer is supplied from the developing roller to the photosensitive member. An object of the present invention is to solve the above problems in an image forming apparatus that develops a latent image.

すなわち、本発明においては、上記のように現像ローラの回転方向下流側の開口部に現像ローラの軸方向に沿った下流シール部材を設けると共に、現像ローラの軸方向両側における開口部に端部シールを設けて、現像剤におけるトナーが現像装置と感光体との隙間から外部に飛散するのを確実に防止できるようすることを課題とするものである。   That is, in the present invention, as described above, the downstream seal member along the axial direction of the developing roller is provided in the opening on the downstream side in the rotation direction of the developing roller, and the end seals are provided at the openings on both sides in the axial direction of the developing roller. To prevent the toner in the developer from splashing outside through the gap between the developing device and the photosensitive member.

本発明においては、上記のような課題を解決するため、感光体と、現像剤を収容させた現像ハウジングの開口部の位置に上記の感光体と所要間隔を介して対向するように回転駆動される現像ローラが設けられた現像装置とを備え、上記の現像ローラにより現像剤を感光体と対向する現像領域に搬送させて感光体に形成された静電潜像を現像する画像形成装置において、上記の現像ローラの回転方向下流側の開口部に現像ローラの軸方向に沿った下流シール部材を設けると共に、現像ローラの軸方向両側において感光体と接触するようにして端部シールを現像ローラの軸方向両側を覆うように開口部近傍の現像ハウジングに装着させ、この端部シールにおける現像領域よりも現像ローラの回転方向下流側の部分に、上記の現像ローラによって現像剤が搬送される現像剤搬送領域に近接する位置まで突出された下流側突出部を設け、この下流側突出部における現像ローラの回転方向上流側の突出部分を、現像ローラの回転方向下流側に向けて傾斜して突出させると共に、上記の下流側突出部を上記の現像ローラと感光体との間で挟持させるようにした。 In the present invention, in order to solve the above-described problems, the photosensitive member and the developing housing containing the developer are rotationally driven so as to face the position of the photosensitive member with a predetermined interval. An image forming apparatus for developing an electrostatic latent image formed on the photosensitive member by transporting a developer to a developing region facing the photosensitive member by the developing roller. A downstream seal member along the axial direction of the developing roller is provided at the opening on the downstream side in the rotational direction of the developing roller, and an end seal is attached to the developing roller so as to come into contact with the photoconductor on both axial sides of the developing roller. It is mounted on the developing housing near the opening so as to cover both sides in the axial direction, and the end roller is exposed to the developing roller at a portion downstream of the developing region in the rotation direction of the developing roller. A downstream protrusion is provided that protrudes to a position close to the developer conveyance area where the developer is conveyed, and a protruding portion upstream of the developing roller in the rotation direction of the downstream protrusion is disposed downstream of the developing roller in the rotation direction. The projecting portion is inclined toward the surface, and the projecting portion on the downstream side is sandwiched between the developing roller and the photosensitive member .

ここで、本発明の画像形成装置は、上記のように現像ローラと感光体とを所要間隔を介して対向する現像領域において現像剤におけるトナーを感光体に供給して感光体に形成された静電潜像を現像するようになっていればよく、上記の現像ローラによって搬送させる現像剤は特に限定されず、トナーとキャリアを含む２成分現像剤であっても、トナーだけからなる現像剤であってもよいが、トナーとキャリアを含む２成分現像剤を現像ローラにより磁気ブラシの状態で、感光体と所要間隔を介して対向する現像領域に搬送させて現像を行う場合に有効に用いることができる。   Here, the image forming apparatus of the present invention supplies the toner in the developer to the photosensitive member in the developing region where the developing roller and the photosensitive member are opposed to each other with a predetermined interval as described above. It is sufficient that the electrostatic latent image is developed, and the developer conveyed by the developing roller is not particularly limited. Even a two-component developer including a toner and a carrier is a developer composed only of toner. However, it can be used effectively when developing by transporting a two-component developer containing toner and carrier in the state of a magnetic brush by a developing roller to a developing area facing the photoreceptor via a required interval. Can do.

本発明の画像形成装置においては、現像装置に設けられた現像ローラの回転方向下流側における現像ハウジングの開口部に、現像ローラの軸方向に沿った下流シール部材を設けると共に、現像ローラの軸方向両側において、感光体と接触するようにして端部シールを現像ローラの軸方向両側を覆うように開口部近傍のハウジングに装着させ、現像剤におけるトナーが現像装置と感光体との隙間から外部に飛散するのを抑制するにあたり、さらに上記の端部シールにおける現像領域よりも現像ローラの回転方向下流側の部分に、上記の現像ローラによって現像剤が搬送される現像剤搬送領域に近接する位置まで突出された下流側突出部を設けた。   In the image forming apparatus of the present invention, a downstream seal member along the axial direction of the developing roller is provided at the opening of the developing housing on the downstream side in the rotation direction of the developing roller provided in the developing device, and the axial direction of the developing roller At both sides, end seals are attached to the housing in the vicinity of the opening so as to cover both sides in the axial direction of the developing roller so as to come into contact with the photoconductor, and the toner in the developer is exposed to the outside through the gap between the developing device and the photoconductor. In order to suppress the scattering, further to the position near the developer transport area where the developer is transported by the developing roller to the downstream side in the rotation direction of the developing roller with respect to the developing area in the end seal. A projecting downstream projecting portion was provided.

この結果、本発明の画像形成装置においては、端部シールに設けた上記の下流側突出部により、現像ローラの回転に伴う空気が、現像剤が存在していない現像ローラと端部シールとの間に流れ込むのが抑制され、現像ローラの軸方向両側における現像装置と感光体との隙間を通して、現像剤中におけるトナーが外部に飛散するのも防止されるようになり、画像形成装置内が飛散したトナーで汚れるのがさらに抑制されるようになった。   As a result, in the image forming apparatus of the present invention, due to the above-described downstream protrusion provided on the end seal, the air accompanying the rotation of the developing roller causes air between the developing roller and the end seal where no developer exists. The toner in the developer is prevented from scattering outside through the gap between the developing device and the photoconductor on both sides in the axial direction of the developing roller, and the inside of the image forming apparatus is scattered. It is further suppressed that the toner is stained with the toner.

ここで、本発明の画像形成装置において、現像ローラと感光体と対向する位置において、上記の現像ローラと感光体とが逆方向に移動するように回転する場合には、上記の下流シール部材の先端を感光体と接触するように設けて、現像剤中におけるトナーがこの下流シール部材と感光体との隙間を通して外部に飛散するのを抑制することが好ましい。なお、現像ローラと感光体とが同方向に移動するように回転する場合において、上記の下流シール部材を感光体の表面に接触させると、現像ローラから感光体に供給されたトナーがこの下流シール部材によって掻き取られるようになるため、この場合には、下流シール部材の先端を感光体に接触させないように設ける必要がある。   Here, in the image forming apparatus of the present invention, when the developing roller and the photosensitive member rotate so as to move in the opposite directions at a position facing the developing roller and the photosensitive member, the downstream sealing member It is preferable to prevent the toner in the developer from scattering to the outside through the gap between the downstream seal member and the photosensitive member by providing the front end so as to contact the photosensitive member. In the case where the developing roller and the photosensitive member rotate so as to move in the same direction, if the downstream seal member is brought into contact with the surface of the photosensitive member, the toner supplied from the developing roller to the photosensitive member is transferred to the downstream seal. In this case, the tip of the downstream seal member needs to be provided so as not to contact the photosensitive member.

また、本発明の画像形成装置においては、上記の端部シールにおける下流側突出部を上記の現像ローラと感光体との間で挟持させるようにしたため、現像剤におけるトナーが、現像ローラの軸方向両側における現像装置と感光体との隙間を通して外部に飛散するのが一層防止されるようになる。 In the image forming apparatus of the present invention, since the downstream side projecting portion in the end seals so as to nip between the developing roller and the photosensitive member described above, the toner in the developer is, the axial direction of the developing roller Further scattering to the outside through the gap between the developing device and the photoconductor on both sides is further prevented.

また、本発明の画像形成装置においては、上記の端部シールの下流側突出部における現像ローラの回転方向上流側の突出部分を、現像ローラの回転方向下流側に向けて傾斜して突出させるようにしたため、この下流側突出部において抑止されたトナーが、この下流側突出部における現像ローラの回転方向上流側の突出部分に沿って現像ローラの中央部に戻されるようになる。この結果、この下流側突出部にトナーが蓄積されたり、このように蓄積されたトナーにより端部シールが押されて、現像装置と感光体との間から蓄積されたトナーが外部に漏れ出したりするのが防止されるようになる。 In the image forming apparatus of the present invention, so as to protrude the protruding portion of the upstream side in the rotational direction of the development roller in a downstream side projecting portion of the end seal, and inclined toward the downstream side in the rotational direction of the developing roller For this reason , the toner restrained in the downstream protrusion is returned to the central portion of the developing roller along the protruding portion on the upstream side in the rotation direction of the developing roller in the downstream protrusion. As a result, the toner is accumulated in the downstream protruding portion, or the end seal is pushed by the accumulated toner, and the accumulated toner leaks out between the developing device and the photosensitive member. Will be prevented.

また、本発明の画像形成装置において、上記の端部シールにおける現像領域よりも現像ローラの回転方向上流側の部分に、上記の現像剤搬送領域に近接する位置まで突出された上流側突出部を設けると、現像ローラの回転方向上流側における現像装置と感光体との隙間を通してトナーが飛散するのも防止されるようになる。そして、現像ローラと感光体と対向する位置において、上記の現像ローラと感光体とが逆方向に移動するように回転させると、感光体の回転に伴う空気が、現像剤が存在していない現像ローラと端部シールとの間に流れ込むのが抑制され、現像剤におけるトナーが、現像ローラの回転方向上流側における現像装置と感光体との隙間を通して外部に飛散するのが確実に防止されるようになる。 In the image forming apparatus of the present invention, an upstream protruding portion that protrudes to a position close to the developer conveying area is provided at a portion upstream of the developing area in the end seal in the rotation direction of the developing roller. When provided, it is possible to prevent the toner from scattering through the gap between the developing device and the photoconductor on the upstream side in the rotation direction of the developing roller. Then, at a position facing the developing roller and the photosensitive member, it is rotated so that the developing roller and the photoreceptor moves in the opposite direction, the air caused by the rotation of the photosensitive member, not the developer is present developed The flow between the roller and the end seal is suppressed, and the toner in the developer is reliably prevented from splashing outside through the gap between the developing device and the photoconductor on the upstream side in the rotation direction of the developing roller. become.

また、上記の上流側突出部における現像ローラの回転方向下流側の突出部分を、現像ローラの回転方向上流側に向けて傾斜して突出させると、この上流側突出部において抑止されたトナーが、この上流側突出部における現像ローラの回転方向下流側の突出部分に沿って現像ローラの中央部に戻されるようになる。この結果、この上流側突出部にトナーが蓄積されたり、このように蓄積されたトナーにより端部シールが押されて、現像装置と感光体との間から蓄積されたトナーが外部に漏れ出したりするのが防止されるようになる。   Further, when the protruding portion on the downstream side in the rotation direction of the developing roller in the upstream side protruding portion is inclined and protruded toward the upstream side in the rotating direction of the developing roller, the toner suppressed in the upstream protruding portion is The upstream protruding portion is returned to the central portion of the developing roller along the protruding portion on the downstream side in the rotation direction of the developing roller. As a result, toner is accumulated in the upstream protruding portion, or the end seal is pushed by the accumulated toner, and the accumulated toner leaks out from between the developing device and the photosensitive member. Will be prevented.

次に、この発明の実施形態に係る画像形成装置を添付図面に基づいて具体的に説明する。なお、本発明に係る画像形成装置は、下記の実施形態に示したものに限定されず、その要旨を変更しない範囲において適宜変更して実施できるものである。   Next, an image forming apparatus according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. Note that the image forming apparatus according to the present invention is not limited to those shown in the following embodiments, and can be implemented with appropriate modifications within a range not changing the gist thereof.

この実施形態に係る画像形成装置においても、図１に示すような現像装置１０を用いて、感光体１に形成された静電潜像を現像するようにしている。   Also in the image forming apparatus according to this embodiment, the electrostatic latent image formed on the photoreceptor 1 is developed using a developing device 10 as shown in FIG.

そして、この実施形態に係る画像形成装置においても、図１に示した現像装置１０のように、トナーとキャリアを含む２成分の現像剤Ｄが収容された現像ハウジング１１の開口部１１ａの位置において、現像ローラ１２を感光体１と所要間隔を介して対向するように設けている。   Also in the image forming apparatus according to this embodiment, as in the developing device 10 shown in FIG. 1, at the position of the opening 11a of the developing housing 11 in which the two-component developer D including toner and carrier is accommodated. The developing roller 12 is provided so as to face the photosensitive member 1 with a required interval.

ここで、この実施形態に係る画像形成装置においては、図２及び図３に示すように、上記の現像装置１０において、現像ローラ１２の回転方向下流側における開口部１１ａの部分に、現像ローラ１２の軸方向に沿った下流シール部材１６を設けると共に、上記の現像ローラ１２の軸方向両側において、この現像ローラ１２の軸方向両側を覆うようにして端部シール１７を設けている。   Here, in the image forming apparatus according to this embodiment, as shown in FIGS. 2 and 3, in the developing device 10 described above, the developing roller 12 is provided at the opening 11 a portion on the downstream side in the rotation direction of the developing roller 12. A downstream seal member 16 is provided along the axial direction, and end seals 17 are provided on both sides of the developing roller 12 in the axial direction so as to cover both sides of the developing roller 12 in the axial direction.

そして、この実施形態においては、上記の端部シール１７において、現像ローラ１２によって現像剤Ｄを感光体１に導いて現像を行う現像領域よりも現像ローラ１２の回転方向下流側の部分に、現像ローラ１２によって現像剤Ｄが搬送される現像剤搬送領域Ｌに近接する位置まで突出された下流側突出部１７ａを設けると共に、上記の現像領域よりも現像ローラ１２の回転方向上流側の部分に、現像ローラ１２によって現像剤Ｄが搬送される現像剤搬送領域Ｌに近接する位置まで突出された上流側突出部１７ｂを設けている。   In this embodiment, in the end seal 17, the developing roller 12 guides the developer D to the photosensitive member 1 and develops the portion on the downstream side in the rotation direction of the developing roller 12 with respect to the developing region. A downstream protrusion 17a is provided that protrudes to a position close to the developer transport region L where the developer D is transported by the roller 12, and at a portion upstream of the developing region in the rotation direction of the developing roller 12, An upstream protruding portion 17b is provided that protrudes to a position close to the developer transport region L where the developer D is transported by the developing roller 12.

また、この実施形態においては、上記の下流側突出部１７ａにおける現像ローラ１２の回転方向上流側の突出部分１７ａ１を、現像ローラ１２の回転方向下流側に向けて傾斜して突出させると共に、上記の上流側突出部１７ｂにおける現像ローラ１２の回転方向下流側の突出部分１７ｂ１を、現像ローラ１２の回転方向上流側に向けて傾斜して突出させるようにしている。   Further, in this embodiment, the protruding portion 17a1 on the upstream side in the rotation direction of the developing roller 12 in the downstream side protruding portion 17a is inclined and protrudes toward the downstream side in the rotation direction of the developing roller 12, and The protruding portion 17b1 on the downstream side in the rotation direction of the developing roller 12 in the upstream side protruding portion 17b is inclined and protrudes toward the upstream side in the rotating direction of the developing roller 12.

そして、この実施形態においては、図４に示すように、現像ローラ１２の軸方向に沿って現像ローラ１２の回転方向下流側における開口部１１ａの部分に設けた下流シール部材１６を、現像ローラ１２と逆方向に移動するように回転する感光体１の表面に接触させるようにしている。   In this embodiment, as shown in FIG. 4, the downstream seal member 16 provided in the opening portion 11 a on the downstream side in the rotation direction of the developing roller 12 along the axial direction of the developing roller 12 is provided with the developing roller 12. The surface of the photoreceptor 1 is rotated so as to move in the opposite direction.

また、上記の現像ローラ１２の軸方向両側に設けられた端部シール１７を、現像ローラ１２の軸方向両側における感光体１の軸方向両側の表面に接触させると共に、各端部シール１７において現像剤搬送領域Ｌに近接するように突出された上記の下流側突出部１７ａ及び上流側突出部１７ｂを、それぞれ感光体１と現像ローラ１２との間で挟持させるようにしている。   Further, the end seals 17 provided on both sides in the axial direction of the developing roller 12 are brought into contact with the surfaces on both sides in the axial direction of the photosensitive member 1 on both sides in the axial direction of the developing roller 12, and development is performed at each end seal 17. The downstream projecting portion 17a and the upstream projecting portion 17b projecting so as to be close to the agent transport region L are sandwiched between the photoreceptor 1 and the developing roller 12, respectively.

そして、この実施形態の画像形成装置において、前記のように感光体１と現像ローラ１２とが対向する位置において、感光体１と現像ローラ１２とが逆方向に移動するように感光体１と現像ローラ１２とを回転させて、この現像ローラ１２により所定量の現像剤Ｄを感光体１と所要間隔を介して対向する現像領域に導いて現像を行うようにした場合、上記の下流シール部材１６により、現像ローラ１２の回転方向下流側における現像装置１０と感光体１との間を通して現像剤Ｄ中におけるトナーが外部に飛散するのが防止される。   In the image forming apparatus according to this embodiment, the photosensitive member 1 and the developing roller 12 are developed so that the photosensitive member 1 and the developing roller 12 move in opposite directions at the position where the photosensitive member 1 and the developing roller 12 face each other as described above. When the developing roller 12 rotates the roller 12 so that a predetermined amount of the developer D is guided to the developing region facing the photosensitive member 1 through a predetermined interval to perform development, the downstream seal member 16 described above is used. Thus, the toner in the developer D is prevented from being scattered outside through the space between the developing device 10 and the photosensitive member 1 on the downstream side in the rotation direction of the developing roller 12.

また、上記のように現像ローラ１２の軸方向両側を覆うようにして設けた端部シール１７により、現像ローラ１２の軸方向両側における現像装置１０と感光体１との間から現像剤Ｄ中におけるトナーが外部に飛散するのが防止されるようになる。   Further, as described above, the end seal 17 provided so as to cover both sides of the developing roller 12 in the axial direction causes the developer D to pass from between the developing device 10 and the photosensitive member 1 on both sides of the developing roller 12 in the axial direction. The toner is prevented from scattering to the outside.

そして、この端部シール１７に設けた上記の下流側突出部１７ａにより、現像ローラ１２の回転に伴う空気の流れによって現像剤Ｄ中におけるトナーが、現像剤Ｄが存在していない現像ローラ１２と端部シール１７との間に流れ込むのが抑制されると共に、この端部シール１７に設けた上記の上流側突出部１７ｂにより、感光体１の回転に伴う空気の流れによって現像剤Ｄ中におけるトナーが、現像剤Ｄが存在していない現像ローラ１２と端部シール１７との間に流れ込むのが抑制され、現像ローラ１２の軸方向両側における現像装置１０と感光体１との間から現像剤Ｄ中におけるトナーが外部に飛散するのが一層防止されるようになる。   The downstream projecting portion 17a provided on the end seal 17 causes the toner in the developer D to flow from the developing roller 12 where the developer D does not exist due to the air flow accompanying the rotation of the developing roller 12. The toner in the developer D is restrained from flowing between the end seal 17 and the upstream projecting portion 17b provided on the end seal 17 by the air flow accompanying the rotation of the photoreceptor 1. However, the developer D is prevented from flowing between the developing roller 12 where the developer D does not exist and the end seal 17, and the developer D from between the developing device 10 and the photoreceptor 1 on both sides in the axial direction of the developing roller 12 is suppressed. The toner inside can be further prevented from scattering to the outside.

さらに、この実施形態においては、上記の下流側突出部１７ａと上流側突出部１７ｂとをそれぞれ感光体１と現像ローラ１２との間で挟持させているため、現像ローラ１２の軸方向両側における現像ローラ１２の回転方向下流側及び上流側の位置から、現像剤Ｄにおけるトナーが外部に飛散するのが一層防止されるようになる。   Further, in this embodiment, since the downstream protrusion 17a and the upstream protrusion 17b are sandwiched between the photosensitive member 1 and the developing roller 12, respectively, development on both sides in the axial direction of the developing roller 12 is performed. It is possible to further prevent the toner in the developer D from scattering from the downstream and upstream positions of the roller 12 in the rotational direction.

さらに、この実施形態においては、上記の下流側突出部１７ａにおける現像ローラの回転方向上流側の突出部分１７ａ１を、現像ローラの回転方向下流側に向けて傾斜して突出させているため、この下流側突出部１７ａにおいて抑止されたトナーが、この下流側突出部１７ａにおける現像ローラの回転方向上流側の突出部分１７ａ１に沿って現像ローラ１２の中央部に戻されるようになり、また上記の上流側突出部１７ｂにおける現像ローラ１２の回転方向下流側の突出部分１７ｂ１を、現像ローラ１２の回転方向上流側に向けて傾斜して突出させているため、この上流側突出部１７ｂにおいて抑止されたトナーが、この上流側突出部１７ｂにおける現像ローラ１２の回転方向下流側の突出部分１７ｂ１に沿って現像ローラ１２の中央部に戻されるようになる。   Further, in this embodiment, since the protruding portion 17a1 on the upstream side in the rotation direction of the developing roller in the downstream side protruding portion 17a is inclined and protrudes toward the downstream side in the rotating direction of the developing roller, The toner restrained in the side protrusion 17a is returned to the center of the developing roller 12 along the protrusion 17a1 on the upstream side in the rotation direction of the developing roller in the downstream protrusion 17a. Since the protruding portion 17b1 on the downstream side in the rotation direction of the developing roller 12 in the protruding portion 17b is inclined and protruded toward the upstream side in the rotating direction of the developing roller 12, the toner restrained in the upstream protruding portion 17b is prevented. The upstream protruding portion 17b returns to the central portion of the developing roller 12 along the protruding portion 17b1 on the downstream side in the rotation direction of the developing roller 12. Made to be.

この結果、上記の下流側突出部１７ａや上流側突出部１７ｂにトナーが蓄積したり、またこのように蓄積したトナーにより端部シール１７が押されて、蓄積されたトナーが現像装置１０と感光体１との間から外部に漏れ出したりするのも防止されるようになる。   As a result, toner accumulates in the downstream projecting portion 17a and the upstream projecting portion 17b, and the end seal 17 is pushed by the accumulated toner, and the accumulated toner is exposed to the developing device 10 and the photosensitive member. Leakage to the outside from between the body 1 is also prevented.

なお、この実施形態の画像形成装置においては、上記のように端部シール１７に下流側突出部１７ａと上流側突出部１７ｂとを設けるようにしたが、図５に示すように、端部シール１７に下流側突出部１７ａだけを設けるようにすることも可能である。   In the image forming apparatus of this embodiment, the end seal 17 is provided with the downstream protrusion 17a and the upstream protrusion 17b as described above. However, as shown in FIG. It is also possible to provide only the downstream side projecting portion 17 a on the 17.

また、この実施形態の画像形成装置においては、トナーとキャリアとを含む２成分の現像剤Ｄを用いた現像装置１０を使用するようにしたが、現像剤にトナーだけを用いた現像装置を使用する場合においても同様である。図示していないが、現像剤のトナーを現像ローラによって感光体と所要間隔を介して対向する現像領域に導き、この現像ローラと感光体との間に振動電界を作用させて、現像剤のトナーを現像ローラと感光体との間に飛翔させて現像を行う場合においても、上記のような下流シール部材と端部シールとを設けることにより、上記の場合と同様にして、現像剤のトナーが現像装置と感光体との間から外部に飛散されるのが確実に防止されるようになる。   Further, in the image forming apparatus of this embodiment, the developing device 10 using the two-component developer D including the toner and the carrier is used. However, the developing device using only the toner as the developer is used. The same is true in the case of doing. Although not shown, the developer toner is guided by a developing roller to a developing area facing the photosensitive member through a required interval, and an oscillating electric field is applied between the developing roller and the photosensitive member, thereby developing toner. In the case where development is carried out by flying between the developing roller and the photosensitive member, the developer toner can be provided in the same manner as described above by providing the downstream seal member and the end seal as described above. It is reliably prevented from being scattered outside between the developing device and the photosensitive member.

現像装置によって感光体に形成された静電潜像を現像する画像形成装置の一例を示した概略説明図である。FIG. 2 is a schematic explanatory diagram illustrating an example of an image forming apparatus that develops an electrostatic latent image formed on a photoconductor by a developing device. 本発明の実施形態に係る画像形成装置において、下流シール部材と端部シールとを設けた現像装置の概略正面図である。FIG. 2 is a schematic front view of a developing device provided with a downstream seal member and an end seal in the image forming apparatus according to the embodiment of the present invention. 同実施形態の画像形成装置において、下流シール部材と端部シールとを設けた現像装置を示した部分拡大説明図である。FIG. 3 is a partially enlarged explanatory view showing a developing device provided with a downstream seal member and an end seal in the image forming apparatus of the embodiment. 同実施形態の画像形成装置において、現像装置における現像ローラと所要間隔を介して感光体を対向させ、上記の下流シール部材を感光体の表面に接触させると共に、端部シールにおける下流側突出部と上流側突出部とを現像ローラと感光体との間で挟持させた状態を示した部分断面説明図である。In the image forming apparatus of the embodiment, the photosensitive member is opposed to the developing roller in the developing device through a required interval, the downstream seal member is brought into contact with the surface of the photosensitive member, and the downstream protruding portion in the end seal is FIG. 6 is a partial cross-sectional explanatory view showing a state in which an upstream protruding portion is sandwiched between a developing roller and a photoconductor. 同実施形態の画像形成装置において、下流シール部材と端部シールとを設けた現像装置の変更例を示した部分拡大説明図である。FIG. 5 is a partially enlarged explanatory view showing a modification of the developing device provided with a downstream seal member and an end seal in the image forming apparatus of the embodiment.

符号の説明Explanation of symbols

１ 感光体
１０ 現像装置
１１ 現像ハウジング
１１ａ 開口部
１２ 現像ローラ
１２ａ マグネット部材
１３ 隔壁
１４ａ，１４ｂ 搬送路
１５ａ，１５ｂ 搬送部材
１６ 下流シール部材
１７ 端部シール
１７ａ 下流側突出部
１７ａ１ 現像ローラの回転方向上流側の突出部分
１７ｂ 上流側突出部
１７ｂ１ 現像ローラの回転方向下流側の突出部分
Ｄ 現像剤
Ｌ 現像剤搬送領域 DESCRIPTION OF SYMBOLS 1 Photoconductor 10 Developing apparatus 11 Developing housing 11a Opening part 12 Developing roller 12a Magnet member 13 Partition 14a, 14b Conveying path 15a, 15b Conveying member 16 Downstream seal member 17 End seal 17a Downstream projecting part 17a1 Upstream direction of developing roller rotation Side protruding portion 17b upstream side protruding portion 17b1 protruding portion on the downstream side in the rotation direction of the developing roller D developer L developer transport region

Claims (9)

感光体と、現像剤を収容させた現像ハウジングの開口部の位置に上記の感光体と所要間隔を介して対向するように回転駆動される現像ローラが設けられた現像装置とを備え、上記の現像ローラにより現像剤を感光体と対向する現像領域に搬送させて感光体に形成された静電潜像を現像する画像形成装置において、上記の現像ローラの回転方向下流側の開口部に現像ローラの軸方向に沿った下流シール部材が設けられると共に、現像ローラの軸方向両側において感光体と接触するようにして端部シールが現像ローラの軸方向両側を覆うように開口部近傍の現像ハウジングに装着され、この端部シールにおける現像領域よりも現像ローラの回転方向下流側の部分に、上記の現像ローラによって現像剤が搬送される現像剤搬送領域に近接する位置まで突出された下流側突出部が設けられ、この下流側突出部における現像ローラの回転方向上流側の突出部分が、現像ローラの回転方向下流側に向けて傾斜して突出されると共に、上記の下流側突出部が上記の現像ローラと感光体との間で挟持されていることを特徴とする画像形成装置。 A photosensitive member and a developing device provided with a developing roller that is rotationally driven so as to face the photosensitive member through a required interval at a position of an opening of a developing housing that contains a developer; In the image forming apparatus for developing the electrostatic latent image formed on the photosensitive member by transporting the developer to the developing region facing the photosensitive member by the developing roller, the developing roller is provided in the opening on the downstream side in the rotation direction of the developing roller. A downstream seal member is provided along the axial direction of the developing roller, and an end seal is provided on the developing housing in the vicinity of the opening so as to contact the photosensitive member on both axial sides of the developing roller so as to cover both axial sides of the developing roller The developer is mounted on the end seal at a position downstream of the developing region in the rotation direction of the developing roller, and close to the developer conveying region where the developer is conveyed by the developing roller. Downstream protrusion that protrudes is provided, the protruding portion of the upstream side in the rotational direction of the development roller in a downstream side projecting portion is projected to be inclined toward the downstream side in the rotational direction of the developing roller Rutotomoni, said downstream An image forming apparatus, wherein the side protrusion is sandwiched between the developing roller and the photosensitive member . 請求項１に記載の画像形成装置において、上記の現像剤がトナーとキャリアを含む２成分現像剤であり、この現像剤が上記の現像ローラにより磁気ブラシの状態で搬送されることを特徴とする画像形成装置。   2. The image forming apparatus according to claim 1, wherein the developer is a two-component developer including a toner and a carrier, and the developer is conveyed in the state of a magnetic brush by the developing roller. Image forming apparatus. 請求項１又は請求項２に記載の画像形成装置において、上記の現像ローラが感光体と対向する位置において感光体とが逆方向に移動するように回転すると共に、上記の下流シール部材の先端が感光体と接触するように設けられていることを特徴とする画像形成装置。   3. The image forming apparatus according to claim 1, wherein the developing roller rotates so that the photosensitive member moves in a reverse direction at a position facing the photosensitive member, and the tip of the downstream seal member is moved. An image forming apparatus, wherein the image forming apparatus is provided in contact with a photoconductor. 請求項１〜請求項３の何れか１項に記載の画像形成装置において、上記の端部シールにおける現像領域よりも現像ローラの回転方向上流側の部分に、上記の現像剤搬送領域に近接する位置まで突出された上流側突出部が設けられていることを特徴とする画像形成装置。 4. The image forming apparatus according to claim 1, wherein the developer seal region is close to a portion upstream of the developing region in the end seal in the rotation direction of the developing roller. 5. An image forming apparatus comprising an upstream protruding portion protruding to a position. 請求項４に記載の画像形成装置において、上記の上流側突出部における現像ローラの回転方向下流側の突出部分が、現像ローラの回転方向上流側に向けて傾斜して突出されていることを特徴とする画像形成装置。 5. The image forming apparatus according to claim 4 , wherein a protruding portion of the upstream protruding portion on the downstream side in the rotation direction of the developing roller is inclined and protrudes toward the upstream side in the rotating direction of the developing roller. An image forming apparatus. 感光体と、現像剤を収容させた現像ハウジングの開口部の位置に上記の感光体と所要間隔を介して対向するように回転駆動される現像ローラが設けられた現像装置とを備え、上記の現像ローラにより現像剤を感光体と対向する現像領域に搬送させて感光体に形成された静電潜像を現像する画像形成装置において、上記の現像ローラが感光体と対向する位置において、現像ローラと感光体とが逆方向に移動するように回転され、上記の現像ローラの回転方向下流側の開口部に現像ローラの軸方向に沿った下流シール部材が設けられると共に、現像ローラの軸方向両側において感光体と接触するようにして端部シールが現像ローラの軸方向両側を覆うように開口部近傍の現像ハウジングに装着され、この端部シールにおける現像領域よりも現像ローラの回転方向下流側の部分に、上記の現像ローラによって現像剤が搬送される現像剤搬送領域に近接する位置まで突出された下流側突出部が設けられ、この下流側突出部における現像ローラの回転方向上流側の突出部分が、現像ローラの回転方向下流側に向けて傾斜して突出されると共に、上記の端部シールにおける現像領域よりも現像ローラの回転方向上流側の部分に、上記の現像剤搬送領域に近接する位置まで突出された上流側突出部が設けられ、この上流側突出部における現像ローラの回転方向下流側の突出部分が、現像ローラの回転方向上流側に向けて傾斜して突出されていることを特徴とする画像形成装置。 A photosensitive member and a developing device provided with a developing roller that is rotationally driven so as to face the photosensitive member through a required interval at a position of an opening of a developing housing that contains a developer; In an image forming apparatus that develops an electrostatic latent image formed on a photosensitive member by transporting the developer to a developing region facing the photosensitive member by a developing roller, the developing roller at a position where the developing roller faces the photosensitive member And the photosensitive member are rotated so as to move in opposite directions, and a downstream seal member is provided along the axial direction of the developing roller at an opening on the downstream side in the rotational direction of the developing roller. In this case, the end seal is attached to the developing housing near the opening so as to cover both sides in the axial direction of the developing roller so as to come into contact with the photosensitive member. A downstream projecting portion projecting to a position close to the developer transport area where the developer is transported by the developing roller is provided at a portion on the downstream side in the rotation direction of the roller. The protruding portion on the upstream side in the rotational direction protrudes inclining toward the downstream side in the rotational direction of the developing roller, and the above-described portion in the rotational direction upstream of the developing roller with respect to the developing region in the end seal described above An upstream protruding portion is provided that protrudes to a position close to the developer transport area, and a protruding portion of the upstream protruding portion on the downstream side in the rotation direction of the developing roller is inclined toward the upstream side in the rotation direction of the developing roller. The image forming apparatus is characterized by being projected. 請求項６に記載の画像形成装置において、上記の現像剤がトナーとキャリアを含む２成分現像剤であり、この現像剤が上記の現像ローラにより磁気ブラシの状態で搬送されることを特徴とする画像形成装置。7. The image forming apparatus according to claim 6, wherein the developer is a two-component developer including a toner and a carrier, and the developer is conveyed in the state of a magnetic brush by the developing roller. Image forming apparatus. 請求項６又は請求項７に記載の画像形成装置において、上記の下流シール部材の先端が感光体と接触するように設けられていることを特徴とする画像形成装置。 8. The image forming apparatus according to claim 6, wherein a tip of the downstream seal member is provided so as to be in contact with the photosensitive member. 請求項６〜請求項８の何れか１項に記載の画像形成装置において、上記の端部シールにおける下流側突出部が上記の現像ローラと感光体との間で挟持されていることを特徴とする画像形成装置。9. The image forming apparatus according to claim 6, wherein a downstream protrusion of the end seal is sandwiched between the developing roller and the photosensitive member. Image forming apparatus.
JP2008105356A 2008-04-15 2008-04-15 Image forming apparatus Expired - Fee Related JP5315760B2 (en)

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