JP3248765B2 - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JP3248765B2 JP3248765B2 JP28053292A JP28053292A JP3248765B2 JP 3248765 B2 JP3248765 B2 JP 3248765B2 JP 28053292 A JP28053292 A JP 28053292A JP 28053292 A JP28053292 A JP 28053292A JP 3248765 B2 JP3248765 B2 JP 3248765B2
- Authority
- JP
- Japan
- Prior art keywords
- developer
- amount
- developing
- developing roller
- developing device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Dry Development In Electrophotography (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は電子写真装置や静電記録
装置において静電潜像を可視化する現像装置に係り、特
に現像剤の漏れを防止する現像装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device for visualizing an electrostatic latent image in an electrophotographic device or an electrostatic recording device, and more particularly to a developing device for preventing a developer from leaking.
【０００２】[0002]
【従来の技術】現像装置は現像ロ−ラ（現像剤供給手
段）を備え、この現像ロ−ラの回転により、現像剤を感
光ドラム（像担持体）に形成された静電潜像に供給して
現像するとともに、現像後、その一部を回収するように
なっている。2. Description of the Related Art A developing device is provided with a developing roller (developer supplying means), and supplies a developer to an electrostatic latent image formed on a photosensitive drum (image carrier) by rotation of the developing roller. And develop, and after the development, a part thereof is collected.
【０００３】また、上記現像ロ−ラの両端部側にはシ−
ル部材（規制部材）が配設され、これらシ−ル部材によ
り、現像ロ−ラ両端部からの現像剤の漏れが防止される
ようになっている。In addition, seals are provided at both ends of the developing roller.
A sealing member (a regulating member) is provided, and the leakage of the developer from both ends of the developing roller is prevented by these sealing members.
【０００４】ところで、上記現像ロ−ラ上の現像剤はド
クタ−ブレ−ドによってその層厚が規制されるが、その
規制は常に一定ではなく、使用条件（現像装置の傾き、
トナ−補給など）によって多かったり、少なかったりす
る。The layer thickness of the developer on the developing roller is regulated by a doctor blade, but the regulation is not always constant.
(Toner replenishment, etc.).
【０００５】この現像剤層の変化は画像形成領域である
現像ロ−ラの中央部周辺で少なく、逆に、現像ロ−ラ内
のマグネットロ−ラの磁力が弱い部位、あるいは、現像
剤が溜まり易い現像ロ−ラの両端部で顕著である。The change in the developer layer is small around the central portion of the developing roller, which is an image forming area. Conversely, a portion where the magnetic force of the magnet roller in the developing roller is weak, or the developer is This is remarkable at both ends of the developing roller where the developing roller easily accumulates.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、従来に
おいては、シ−ル部材の厚さ寸法が現像ロ−ラの回転方
向上流側である現像剤供給側と回転方向下流側である現
像剤回収側とで等しく形成されていたため、現像ロ−ラ
の上流側端部における現像剤供給量と、現像ロ−ラの下
流側端部における現像剤引込量とが等しい。このため、
現像ロ−ラの回転方向上流側、特にその端部で現像剤量
が上昇した場合に、現像ロ−ラの回転方向下流側に搬送
されたトナ−がシ−ル部材に蹴られて外部に飛散して機
体内を汚し、さらに、画像出力ができなくなるという問
題がった。In the prior art, however, the thickness of the seal member has conventionally been such that the developer supply side is the upstream side in the rotation direction of the developing roller and the developer collection side is the downstream side in the rotation direction. Therefore, the amount of developer supplied at the upstream end of the developing roller is equal to the amount of developer drawn in at the downstream end of the developing roller. For this reason,
When the amount of the developer increases at the upstream side in the rotation direction of the developing roller, especially at the end thereof, the toner conveyed to the downstream side in the rotation direction of the developing roller is kicked by the seal member and is directed to the outside. There is a problem that the airplane scatters and contaminates the inside of the machine, and furthermore, an image cannot be output.
【０００７】そこで、本発明は、現像剤供給手段の両端
部における回転方向下流側での現像剤の引込可能量を増
大させて現像剤の漏れを防止できるようにした現像装置
を提供することを目的とする。Accordingly, the present invention provides a developing device capable of preventing the leakage of the developer by increasing the drawable amount of the developer at the both ends of the developer supply means on the downstream side in the rotation direction. Aim.
【０００８】[0008]
【課題を解決するための手段】本発明は上記課題を解決
するため、静電潜像が形成される像担持体に対面して所
定の方向に沿って設けられ、内部にマグネットを有し表
面に現像剤を担持して回転することにより、前記静電潜
像に現像剤を供給して現像するとともに、現像後、残留
した現像剤を回収する現像剤供給手段と、この現像剤供
給手段の前記所定方向両端部にその回転方向に沿って設
けられ、前記現像剤の供給側に位置する磁性部及びこの
磁性部より磁力を小とし前記現像剤の回収側に位置する
磁性部とを有し、前記現像剤の漏れを規制する規制部材
とを具備する。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is provided along a predetermined direction facing an image carrier on which an electrostatic latent image is formed, and has a magnet inside the surface. A developer supply unit for supplying and developing the developer to the electrostatic latent image by developing and supplying the developer to the electrostatic latent image by rotating the developer supply unit; A magnetic portion provided at both ends in the predetermined direction along the rotation direction and located on the developer supply side and a magnetic portion having a smaller magnetic force than the magnetic portion and located on the developer recovery side. And a regulating member for regulating leakage of the developer.
【０００９】[0009]
【作用】磁性部材の現像剤回収側に位置する磁性部の磁
力を現像剤供給側に位置する磁性部の磁力よりも小とす
ることにより、現像剤回収側での現像剤引込可能量を大
きくして現像剤を確実に回収できるようにする。By making the magnetic force of the magnetic part located on the developer collection side of the magnetic member smaller than the magnetic force of the magnetic part located on the developer supply side, the amount of developer drawable on the developer collection side is increased. To ensure that the developer can be recovered.
【００１０】[0010]
【実施例】以下、本発明を図１〜図５に示す一実施例を
参照して説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in FIGS.
【００１１】図２は本発明の現像装置を採用した画像形
成装置１の構成を示す。FIG. 2 shows the structure of an image forming apparatus 1 employing the developing device of the present invention.
【００１２】図２において、画像形成装置本体２の略中
央部には、像担持体としての感光体ドラム３が矢印方向
に回転自在に設けられている。この感光体ドラム３は、
有機感光体（ＯＰＣ）系の光導電材料から形成されてい
る。In FIG. 2, a photosensitive drum 3 as an image carrier is provided at a substantially central portion of the image forming apparatus main body 2 so as to be rotatable in the direction of an arrow. This photosensitive drum 3
It is formed of an organic photoconductor (OPC) -based photoconductive material.
【００１３】感光体ドラム３の周囲には、その回転方向
に沿って順次、除電器４、帯電手段としてのスコロトロ
ン帯電器６、静電潜像形成手段としてのレーザ装置７、
現像装置８、および転写器９さらにクリ−ニング装置５
が配設されている。そして、感光体ドラム３の周面に現
像剤像としてのトナ−像を形成する画像形成手段１０を
構成している。Around the photoreceptor drum 3, a static eliminator 4, a scorotron charger 6 as a charging unit, a laser device 7 as an electrostatic latent image forming unit, are sequentially arranged along the rotation direction.
Developing device 8, transfer device 9, and cleaning device 5
Are arranged. The image forming unit 10 forms a toner image on the peripheral surface of the photosensitive drum 3 as a developer image.
【００１４】装置本体２内には、装置本体２の内部に装
着された給紙カセット１１ａ，１１ｂから取出された被
転写材としての用紙Ｐを、前記画像形成手段１０の前記
感光体ドラム３と前記転写ロ−ラ９との間の画像転写部
１２を経て装置本体２の他側に配置された排紙トレイ１
３に導く被転写材搬送路としての用紙搬送路１４が形成
されている。In the apparatus main body 2, a sheet P as a material to be transferred taken out from the paper feed cassettes 11 a and 11 b mounted inside the apparatus main body 2 is transferred to the photosensitive drum 3 of the image forming unit 10. The paper discharge tray 1 disposed on the other side of the apparatus main body 2 via the image transfer section 12 between the transfer roller 9 and the transfer roller 9
A paper transport path 14 is formed as a transfer medium transport path leading to 3.
【００１５】この用紙搬送路１４の前記画像転写部１２
の上流側には、給紙ロ−ラ１５ａ，１５ｂを介して給紙
カセット１１ａ，１１ｂから取出された用紙Ｐの先端整
位を行った後、タイミングをとって画像転写部１２に送
り込むアライニングロ−ラ対１６が配置されている。The image transfer section 12 of the paper transport path 14
After aligning the leading edge of the paper P taken out of the paper feed cassettes 11a and 11b via the paper feed rollers 15a and 15b, the aligning roller which feeds the paper P to the image transfer unit 12 at a time is provided. A pair of rollers 16 are arranged.
【００１６】上記給紙カセット１１ａ，１１ｂから取出
された用紙Ｐはガイド２３，２３と搬送ロ−ラ２４，２
４からなる搬送手段によって搬送されるまた、前記画像
転写部１２の下流側には、用紙Ｐに転写されたトナ−像
を定着する定着装置１７および定着された用紙Ｐを排紙
トレイ１３に排出する排紙ロ−ラ対１８が設けられてい
る。The sheets P taken out of the sheet cassettes 11a, 11b are guided by guides 23, 23 and transport rollers 24, 2.
The fixing device 17 for fixing the toner image transferred to the sheet P and the fixed sheet P are discharged to the discharge tray 13 downstream of the image transfer section 12. A discharge roller pair 18 is provided.
【００１７】さらに、上記排紙ロ−ラ対１８の排出側に
は、用紙Ｐの排出方向を切り換えるゲ−ト２０が設けら
れている。このゲ−ト２０が実線方向に切り換えられる
ことにより、装置本体２の上面側に形成された凹所から
なる排紙部２２に画像形成面を下にした状態で排紙され
るようになっている。Further, on the discharge side of the discharge roller pair 18, a gate 20 for switching the discharge direction of the paper P is provided. When the gate 20 is switched in the direction of the solid line, the sheet is discharged to the sheet discharge section 22 formed of a recess formed on the upper surface side of the apparatus main body 2 with the image forming surface down. I have.
【００１８】つぎに、このように構成された画像形成装
置１の画像形成動作について説明する。Next, an image forming operation of the image forming apparatus 1 configured as described above will be described.
【００１９】感光ドラム３を回転させるとともに、感光
ドラム３の周面をスコロトロン帯電器６により略均一に
負に帯電する。続いて、この帯電領域にレーザ装置７か
ら記録すべき画像情報に応じてレーザビーム７Ａを照射
して露光し、感光体ドラム３の表面に静電潜像を形成す
る。ついで、この静電潜像は感光体ドラム３の回転に伴
って現像装置８と対面する。As the photosensitive drum 3 is rotated, the peripheral surface of the photosensitive drum 3 is substantially uniformly negatively charged by the scorotron charger 6. Subsequently, the charged area is irradiated with a laser beam 7 </ b> A according to image information to be recorded from the laser device 7, and is exposed to form an electrostatic latent image on the surface of the photosensitive drum 3. Next, the electrostatic latent image faces the developing device 8 as the photosensitive drum 3 rotates.
【００２０】ここで、感光ドラム３上の静電潜像にトナ
ーが付着されてトナー像が形成される。この場合、トナ
ーは光の照射域に付着し、いわゆる反転現像される。現
像後のトナー像は、次に転写器９と対面する転写領域に
搬送される。Here, toner is attached to the electrostatic latent image on the photosensitive drum 3 to form a toner image. In this case, the toner adheres to the light irradiation area and is subjected to so-called reversal development. The developed toner image is then transported to a transfer area facing the transfer unit 9.
【００２１】一方、転写領域には、給紙ローラ１５ａ
（１５ｂ）の回転により給紙カセット１１ａ（１１ｂ）
から用紙が取出され、アライニングロ−ラ対１６を介し
て感光体ドラム３の回転に同期して送られてくる。On the other hand, a paper feed roller 15a
The paper feed cassette 11a (11b) is rotated by the rotation of (15b).
The sheet is taken out from the printer and is sent through the aligning roller pair 16 in synchronization with the rotation of the photosensitive drum 3.
【００２２】ここに搬送されてきた用紙Ｐは、転写ロー
ラ９により、その裏面がプラスの極性に帯電される。し
たがって、感光ドラム３の表面上のトナー像は静電気的
に用紙に引寄せられて転写される。The back side of the paper P conveyed here is charged by the transfer roller 9 to a positive polarity. Therefore, the toner image on the surface of the photosensitive drum 3 is electrostatically attracted to the paper and transferred.
【００２３】また、転写後の用紙は定着装置１７に送ら
れ、ここでトナーが熱および圧力で用紙に溶融定着され
た後、排出される。The sheet after the transfer is sent to a fixing device 17, where the toner is melted and fixed on the sheet by heat and pressure, and then discharged.
【００２４】ところで、転写後の感光体ドラム３の表面
には、わずかながら転写し切れずに残留したトナーがあ
る。このトナーは、クリ−ニング装置５によりクリ−ニ
ングされる。このようにクリ−ニングされたのち、感光
ドラム３は除電器４で除電されたのち、帯電器６で帯電
後、レーザ装置７により露光されて静電潜像が形成さ
れ、再び（２回目）現像装置８に対面する現像清掃位置
に到達する。By the way, on the surface of the photosensitive drum 3 after the transfer, there is a small amount of toner that has not been completely transferred and remains. This toner is cleaned by the cleaning device 5. After being cleaned in this way, the photosensitive drum 3 is neutralized by the static eliminator 4 and then charged by the charger 6 and then exposed by the laser device 7 to form an electrostatic latent image, again (second time). The developer reaches the developing cleaning position facing the developing device 8.
【００２５】ところで、現像装置８には図１、図３にも
示すように、その現像容器３０内に現像剤供給手段とし
ての現像ロ−ラ３１が矢印方向に回転自在に設けられて
いる。この現像ロ−ラ３１は内部にマグネットロ−ラ３
１ａを備え、上記感光ドラム３に対向されている。As shown in FIGS. 1 and 3, the developing device 8 is provided with a developing roller 31 as developer supply means in the developing container 30 so as to be rotatable in the direction of the arrow. The developing roller 31 has a magnet roller 3 inside.
1a, and is opposed to the photosensitive drum 3.
【００２６】上記現像ロ−ラ３１は感光体ドラム３の回
転方向に対して接触部において同方向、すなわち、ウイ
ズ方向となる状態で回転するようになっている。The developing roller 31 is configured to rotate in the same direction as the rotating direction of the photosensitive drum 3 at the contact portion, that is, in the width direction.
【００２７】現像容器３０内には、現像ロ−ラ３１の上
方に位置して、現像ロ−ラ３１によるトナ−搬送量を規
制し、現像ロ−ラ３１の表面に前記トナ−の薄層を形成
するブレ−ド３３が設けられている。In the developing container 30, the toner conveying amount by the developing roller 31 is regulated above the developing roller 31, and a thin layer of the toner is formed on the surface of the developing roller 31. Is provided.
【００２８】そして、上記現像ロ−ラ３１の両端部側に
は、現像剤の外部への漏れを防止すえるためのシ−ル部
材（規制部材）３４，３４が配設されている。これらシ
−ル部材３４，３４は図３に示すように、その下半部側
の内面側が切欠され、すなわち、現像ロ−ラ３１の現像
剤供給側である回転方向上流側に位置する部分の厚さ寸
法ｔ1 よりも、現像剤回収側である回転方向下流側に位
置する部分の厚さ寸法ｔ2 が小とされて薄く形成されて
いる。At both ends of the developing roller 31, seal members (regulating members) 34, 34 for preventing leakage of the developer to the outside are provided. As shown in FIG. 3, these seal members 34, 34 are notched at the lower half inner surface side, that is, a portion of the developing roller 31 which is located on the upstream side in the rotation direction on the developer supply side. than the thickness t 1, the thickness t 2 of the portion located downstream in the rotational direction as a developer recovery side is formed thinner is small.
【００２９】しかして、現像時には、現像ロ−ラ３１が
回転されて現像剤が図中矢印Ｂ方向に搬送されて感光ド
ラム３へ供給され感光ドラム３上の静電潜像が現像され
る。During development, the developing roller 31 is rotated, and the developer is conveyed in the direction of arrow B in the figure and supplied to the photosensitive drum 3, whereby the electrostatic latent image on the photosensitive drum 3 is developed.
【００３０】この現像後、現像ロ−ラ３１に残った現像
剤は矢印Ｃで示すように、現像容器３０の下部側に引き
込まれて回収される。After the development, the developer remaining on the developing roller 31 is drawn into the lower side of the developing container 30 and collected as shown by an arrow C.
【００３１】この現像時において、現像ロ−ラ３１上の
現像剤の層形成は図４に示す如くであるが、装置本体２
が傾いたり、トナ−の補給により、現像剤の嵩の上昇が
あると、図４に破線で示すように、その端部で現像剤Ｔ
が膨らんでしまう。At the time of this development, the layer formation of the developer on the development roller 31 is as shown in FIG.
When the developer is tilted or the bulk of the developer is increased due to toner replenishment, as shown by a broken line in FIG.
Swells.
【００３２】この場合、現像ロ−ラ３１の下部側で現像
剤の引き込み量が増加するが、上記したように、シ−ル
部材３４は現像ロ−ラ３１の回転方向下流側で厚さが薄
く形成されているため、現像剤引き込み時の抵抗が少な
く、良好に回収できる。In this case, the amount of developer drawn in at the lower side of the developing roller 31 increases. However, as described above, the thickness of the seal member 34 at the downstream side in the rotation direction of the developing roller 31 is increased. Since it is formed to be thin, the resistance at the time of pulling in the developer is small and it can be collected well.
【００３３】なお、シ−ル部材３４の厚さと現像剤落下
量との関係については、図５に示す如くである。すなわ
ち、シ−ル部材３４の下部側の厚さｔ2 の寸法が増大す
るにしたがって現像剤の落ち量が増加し、厚さｔ2 の寸
法が低下するにしたがって現像剤の落ち量が低下する。The relationship between the thickness of the seal member 34 and the amount of developer falling is as shown in FIG. That is, - increased drop amount of the developer according to the lower side of the thickness t 2 dimensions of seal member 34 is increased, the dimensions of the thickness t 2 is fallen amount of the developer decreases with decreasing .
【００３４】なお、本発明は上記一実施例に限られるも
のではなく、図６に示すようなものであっても良い。It should be noted that the present invention is not limited to the above embodiment, but may be as shown in FIG.
【００３５】すなわち、シ−ル部材３４の厚さ寸法がｔ
1 ＝ｔ2 の状態から、シ−ル部材３４の上部側の厚さ寸
法ｔ1 のみを厚くした場合を示す。That is, when the thickness of the seal member 34 is t
The case where only the thickness t 1 on the upper side of the seal member 34 is increased from the state of 1 = t 2 .
【００３６】図６に記載された実施例と、図３に記載さ
れた実施例とは異なる。図３に示すものは、現像剤供給
側での現像剤量を変えることなくそのままとし、現像後
における現像剤回収側での現像剤の引込可能量を高める
ものである。これに対し、図６に示すものは、現像剤供
給側での現像剤量を図７に示すようにカットして少なく
し、現像後における現像剤回収側での現像剤の引込可能
量は高めることなく従来通りとするものである。即ち、
本発明では、現像剤供給側での現像剤量と、現像剤回収
側での現像剤引込可能量との関係が相対的に供給側での
現像剤量＜回収側での現像剤引込可能量の関係になれば
良い。従って、そのための方法としては、供給側での現
像剤量を積極的に減らすようにするか、若しくは回収側
での現像剤引込可能量を積極的に増加させるかのどちら
かになる。図６に記載された実施例は、前者の実施例で
あり、図３に記載された実施例は後者の実施例である。
また、ｔ１＝ｔ２とは、現像剤供給側での現像剤量が現
像剤回収側での現像剤引込可能量と等しい場合で、本発
明の実施例とは異なりシール部材の寸法を現像剤供給側
と回収側とで変化させないで一定の長さにした場合に相
当する。The embodiment according to FIG. 6 differs from the embodiment according to FIG. The one shown in FIG. 3 increases the amount of developer that can be drawn in on the developer recovery side after development without changing the developer amount on the developer supply side. On the other hand, the one shown in FIG. 6 reduces the amount of developer on the developer supply side by cutting as shown in FIG. 7, and increases the amount of developer that can be drawn in on the developer recovery side after development. It is the same as before without any change. That is,
In the present invention, the relationship between the amount of developer on the developer supply side and the amount of developer withdrawable on the developer recovery side is relatively the amount of developer on the supply side <the amount of developer withdrawable on the recovery side. I just want to be in a relationship. Therefore, as a method for this, either the amount of the developer on the supply side is positively reduced or the amount of developer that can be drawn in on the collection side is positively increased. The embodiment illustrated in FIG. 6 is the former embodiment, and the embodiment illustrated in FIG. 3 is the latter embodiment.
Further, t 1 = t 2 means that the amount of the developer on the developer supply side is equal to the amount of the developer that can be drawn in on the developer recovery side, and the size of the seal member is different from that of the embodiment of the present invention. This corresponds to a case where the length is kept constant without changing between the agent supply side and the recovery side.
【００３７】但し、この時の現像剤のカットは画像領域
以外の搬送現像剤に対して行われものである。However, the cut of the developer at this time is performed on the transported developer other than the image area.
【００３８】そして、このときの、端部搬送現像剤を規
制することによる現像剤の落下量は図８に示すように、
その厚さ寸法ｔ1 を増大するにつれて軽減され、反対
に、厚さ寸法ｔ1 を薄くするにしたがい現像剤の落下量
が増大し悪化している。At this time, the amount of the developer falling due to the regulation of the end-portion developer is as shown in FIG.
As the thickness t 1 is increased, it is reduced, and conversely, as the thickness t 1 is reduced, the amount of developer falling increases and deteriorates.
【００３９】また、本発明は図９に示すように、アゲン
スト現像方式のものに用いてもよい。As shown in FIG. 9, the present invention may be applied to an agent developing system.
【００４０】ここで、シ−ル部材４１の厚さ寸法ｔ1 部
とｔ2 部が上下逆になっているが、これは、現像ロ−ラ
３１が逆回転になったことによるものであり、機能上は
先に示すウイズ方式の場合と全く同じである。Here, the thickness t 1 and t 2 of the seal member 41 are upside down, which is due to the fact that the developing roller 31 is rotated in the reverse direction. The function is exactly the same as that of the quiz method described above.
【００４１】但し、アゲンスト方式の場合には現像剤落
ちまで至らない場合もあるが、この場合には、現像容器
３０上部で現像剤が吹き出したり、あるいは、現像ロ−
ラ３１と感光ドラム３との間で目詰まりするするという
問題がある。However, in the case of the agent system, the developer may not fall down, but in this case, the developer blows out from the upper portion of the developing container 30 or the developer is not supplied.
There is a problem that clogging occurs between the drum 31 and the photosensitive drum 3.
【００４２】なお、上記実施例では二成分現像剤を用い
た場合を示したが、磁性一成分現像剤を用いた現像装置
にも適用できる。In the above embodiment, the case where a two-component developer is used is shown, but the present invention can also be applied to a developing device using a magnetic one-component developer.
【００４３】但し、一成分現像装置の場合は、トナ−補
給による現像装置内部の現像剤の上昇はなく、元から入
っているトナ−（現像剤）の量が多い、つまり、嵩の高
い場合がそれに当たり、これにつれて、現像ロ−ラ３１
上のトナ−層のふくらみ、が生じ、トナ−（現像剤）落
ちが発生するものであり、これに対して既に、述べた通
りの同様の効果が得られ、トナ−（現像剤）落ちが軽減
できる。However, in the case of a one-component developing device, the developer inside the developing device does not rise due to toner replenishment, and the amount of toner (developer) originally contained is large, that is, when the bulk is high. And the developing roller 31
The swelling of the upper toner layer occurs, and toner (developer) drop occurs. On the other hand, the same effect as described above is obtained, and toner (developer) drop occurs. Can be reduced.
【００４４】また、本発明は図１１および図１２に示す
ようなものであってもい。The present invention may be as shown in FIGS.
【００４５】この実施例では、シ−ル部材として磁気シ
−ル部材５１が用いられ、図１３に示すように、増加し
た分の現像剤の引き込みも可能とすべく、磁気シ−ル部
材５１の下部側Ｃ2 部の磁力を下げ、引き込み極近傍に
作られるＮ3 −Ｓ間の現像剤拘束力を弱め、現像剤を引
き込み易くした。In this embodiment, a magnetic seal member 51 is used as a seal member, and as shown in FIG. 13, the magnetic seal member 51 is used so that an increased amount of developer can be drawn in. of lowering the magnetic force of the lower side C 2 parts weaken the developer binding between N 3 made to pull close proximity -S, it was easy pull a developer.
【００４６】磁気シ−ル５１の磁力は図１４に示すよう
に、３００ガウス（Ｇ）未満でその現像剤落ちの量が軽
減され、実用レベルになることが分かった。As shown in FIG. 14, when the magnetic force of the magnetic seal 51 was less than 300 gauss (G), the amount of the developer falling was reduced, and it was found that the magnetic seal 51 became a practical level.
【００４７】また、磁気シ−ル５１の上部側Ｃ1 の磁力
を強く、例えば４００ガウス（Ｇ）としてもよい。[0047] The magnetic sheet - strongly upper side C 1 force Le 51, for example 400 may be a Gaussian (G).
【００４８】この場合は先に示したように、引き込み現
像剤の限界量を上げる（引き込みに邪魔な現像剤の磁気
的拘束をなくす）というものではなく、引き込み限界量
はそのままで、搬送される現像剤の量を図１３に一点鎖
線で示すようにカットし、端部の搬送量を少なくするも
である。In this case, as described above, the limit amount of the drawn-in developer is not increased (the magnetic constraint of the developer that hinders the drawing-in is eliminated), and the transfer is performed without changing the drawn-in limit amount. The amount of the developer is cut as shown by a one-dot chain line in FIG. 13 to reduce the transport amount at the end.
【００４９】但し、このときのカットは画像形成領域の
搬送現像材に対しておこなわれるものである。However, the cutting at this time is performed on the transported developer in the image forming area.
【００５０】そして、このときの端部搬送現像剤を規制
することによる現像剤落ちの量は図１５に示すように、
その磁力を強くし、３００ガウス（Ｇ）以上とすること
で、その現像剤落ちの量が軽減され、実用レベルになる
ことが分かった。At this time, the amount of developer drop due to the regulation of the edge transport developer is shown in FIG.
It was found that by increasing the magnetic force to 300 gauss (G) or more, the amount of the developer falling was reduced, and the developer level reached a practical level.
【００５１】[0051]
【発明の効果】以上説明したように、本発明によれば、
現像剤供給手段の両端部における現像剤回収側の現像剤
引込可能量を増大でき、現像剤供給手段の供給側におけ
る現像剤量が増加しても、現像剤供給手段の両端部から
現像剤を漏らすことがなく、良好に回収できるという効
果を奏する。As described above, according to the present invention,
The amount of developer that can be drawn in on the developer collection side at both ends of the developer supply unit can be increased, and even if the amount of developer on the supply side of the developer supply unit increases, the developer can be supplied from both ends of the developer supply unit. This has the effect of being able to collect well without leaking.
【図１】本発明の一実施例である現像装置を示す断面
図。FIG. 1 is a cross-sectional view illustrating a developing device according to an embodiment of the present invention.
【図２】図１の現像装置を採用した画像形成装置の内部
構成を概略的に示す正面図。FIG. 2 is a front view schematically showing an internal configuration of an image forming apparatus employing the developing device of FIG.
【図３】図１の現像装置を矢印Ａ方向から見た状態を示
す図。FIG. 3 is a diagram showing a state in which the developing device of FIG. 1 is viewed from a direction of an arrow A.
【図４】図１の現像装置の現像ロ−ラ上で現像剤が片寄
った状態を示す図。FIG. 4 is a diagram showing a state in which a developer is biased on a developing roller of the developing device of FIG. 1;
【図５】図１の現像装置のシ−ル部材の厚さ寸法と現像
剤の落下量との関係を示すグラフ図。FIG. 5 is a graph showing a relationship between a thickness dimension of a seal member of the developing device of FIG. 1 and a drop amount of a developer.
【図６】本発明の第１の他の実施例である現像装置を示
す断面図。FIG. 6 is a cross-sectional view illustrating a developing device according to another first embodiment of the present invention.
【図７】図６の現像装置の現像ロ−ラ上の現像剤層を示
す図。FIG. 7 is a view showing a developer layer on a developing roller of the developing device of FIG. 6;
【図８】図６の現像装置のシ−ル部材のｔ1 部の厚さ寸
法と現像剤落下量との関係を示すグラフ図。8 sheets of the developing device of FIG. 6 - a graph showing the relationship between the thickness dimension of t 1 part of seal member and the developer drop amount.
【図９】本発明の第２の他の実施例である現像装置を示
す構成図。FIG. 9 is a configuration diagram showing a developing device according to another second embodiment of the present invention.
【図１０】図９中矢印Ａ方向から見た状態を示す図。FIG. 10 is a diagram showing a state viewed from the direction of arrow A in FIG. 9;
【図１１】本発明の第３の他の実施例である現像装置を
示す構成図。FIG. 11 is a configuration diagram illustrating a developing device according to a third other embodiment of the present invention.
【図１２】図１１中矢印Ａ方向から見た状態を示す正面
図。FIG. 12 is a front view showing a state viewed from the direction of arrow A in FIG. 11;
【図１３】図１１の現像ロ−ラ上で片寄った現像剤層を
示す図。FIG. 13 is a view showing a developer layer offset on the developing roller of FIG. 11;
【図１４】図１１の現像装置のシ−ル部材のＣ2 部の磁
力と現像剤落下量との関係を示すグラフ図。[Figure 14] Shi of the developing device of FIG. 11 - graph showing the relationship between the magnetic force of the C 2 parts of seal member and the developer drop amount.
【図１５】図１１の現像装置のシ−ル部材のＣ1 部の磁
力と現像剤落下量との関係を示すグラフ図。[Figure 15] Shi of the developing device of FIG. 11 - graph showing the relationship between the force and the developer dropping amount of C 1 part of seal member.
３…感光体ドラム（像担持体）、３１…現像ロ−ラ（現
像剤供給手段）、３４，３４，４１，５１…シ−ル部
材。3 photoreceptor drum (image carrier), 31 developing roller (developer supply means), 34, 34, 41, 51 ... seal member.
Claims (1)
て所定の方向に沿って設けられ、内部にマグネットを有
し表面に現像剤を担持して回転することにより、前記静
電潜像に現像剤を供給して現像するとともに、現像後、
残留した現像剤を回収する現像剤供給手段と、 この現像剤供給手段の前記所定方向両端部にその回転方
向に沿って設けられ、前記現像剤の供給側に位置する磁
性部及びこの磁性部より磁力を小とし前記現像剤の回収
側に位置する磁性部とを有し、前記現像剤の漏れを規制
する規制部材と、 を具備することを特徴とする現像装置。An image bearing member on which an electrostatic latent image is to be formed is provided along a predetermined direction. A developer is supplied to the electro-latent image for development, and after the development,
A developer supply unit that collects the remaining developer; and a magnetic unit that is provided at both ends of the developer supply unit in the predetermined direction along the rotation direction and is located on the developer supply side. And a regulating member having a small magnetic force and located on the developer collection side, and regulating leakage of the developer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28053292A JP3248765B2 (en) | 1992-09-24 | 1992-09-24 | Developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28053292A JP3248765B2 (en) | 1992-09-24 | 1992-09-24 | Developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06110306A JPH06110306A (en) | 1994-04-22 |
| JP3248765B2 true JP3248765B2 (en) | 2002-01-21 |
Family
ID=17626406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28053292A Expired - Lifetime JP3248765B2 (en) | 1992-09-24 | 1992-09-24 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3248765B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5268386B2 (en) * | 2008-02-27 | 2013-08-21 | 京セラドキュメントソリューションズ株式会社 | Developing device and image forming apparatus including the same |
| JP5707714B2 (en) * | 2010-03-12 | 2015-04-30 | 富士ゼロックス株式会社 | Developing device and image forming apparatus using the same |
| JP5131301B2 (en) * | 2010-03-16 | 2013-01-30 | コニカミノルタビジネステクノロジーズ株式会社 | Developing device, image forming unit, and image forming apparatus |
| JP5817169B2 (en) | 2011-03-28 | 2015-11-18 | 富士ゼロックス株式会社 | Developing device and image forming apparatus |
-
1992
- 1992-09-24 JP JP28053292A patent/JP3248765B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06110306A (en) | 1994-04-22 |
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