JP3323864B2 - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JP3323864B2 JP3323864B2 JP2001151655A JP2001151655A JP3323864B2 JP 3323864 B2 JP3323864 B2 JP 3323864B2 JP 2001151655 A JP2001151655 A JP 2001151655A JP 2001151655 A JP2001151655 A JP 2001151655A JP 3323864 B2 JP3323864 B2 JP 3323864B2
- Authority
- JP
- Japan
- Prior art keywords
- developer
- developing sleeve
- developing
- magnet roller
- magnetic
- 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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- Developing For Electrophotography (AREA)
- Dry Development In Electrophotography (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電子写真方式或は或は
静電記録方式により像担持体上に形成された静電潜像を
現像剤により現像する現像装置に関するものであり、特
に該現像剤が磁性トナーから成る一成分現像剤とか、ト
ナーと磁性キャリアとから成る二成分現像剤のように、
磁性粒子を含んだ現像剤を用いる現像装置に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device for developing an electrostatic latent image formed on an image carrier by an electrophotographic method or an electrostatic recording method with a developer. Like a one-component developer in which the developer is made of a magnetic toner, or a two-component developer in which a toner and a magnetic carrier are used,
The present invention relates to a developing device that uses a developer containing magnetic particles.
【０００２】[0002]
【従来の技術】従来、前述した一成分現像剤或は二成分
現像剤を使用して、像担持体上に形成された静電潜像を
現像するための現像装置には、種々の構成のものが提案
されている。その代表的な現像装置の断面を図１に示
す。2. Description of the Related Art Conventionally, a developing device for developing an electrostatic latent image formed on an image carrier using the above-described one-component developer or two-component developer has various configurations. Things have been suggested. FIG. 1 shows a cross section of a typical developing device.
【０００３】本例の現像装置１は、一成分現像剤或は二
成分現像剤のような磁性粒子を含んだ現像剤６を収容し
た現像容器２を備え、現像容器２には、像担持体１００
上に形成された静電潜像を現像するための現像剤担持体
５（以後「現像ローラ」と称す。）が設けられている。
更に、現像容器２内には、現像剤６を現像ローラ５へと
供給するための搬送手段３及び４が設けられる。The developing device 1 of this embodiment includes a developing container 2 containing a developer 6 containing magnetic particles such as a one-component developer or a two-component developer, and the developing container 2 includes an image carrier. 100
A developer carrier 5 (hereinafter referred to as a “developing roller”) for developing the electrostatic latent image formed thereon is provided.
Further, transport means 3 and 4 for supplying the developer 6 to the developing roller 5 are provided in the developing container 2.
【０００４】一般に、現像ローラ５は、図示するよう
に、磁化された固定の磁石ローラ５ａと、この磁石ロー
ラ５ａを囲包して、矢印方向に回転自在に軸支された、
アルミニウム、ステンレス鋼等の非磁性材料で形成され
た現像スリーブ５ｂとから構成され、該現像スリーブ５
ｂの表面に現像剤を担持して搬送し、像担持体１００上
の静電潜像を現像する。In general, as shown in the figure, a developing roller 5 is provided with a fixed magnet roller 5a which is magnetized, and is rotatably supported around the magnet roller 5a in a direction shown by an arrow.
And a developing sleeve 5b made of a non-magnetic material such as aluminum or stainless steel.
The developer is carried and transported on the surface b, and the electrostatic latent image on the image carrier 100 is developed.
【０００５】現像スリーブ５ｂは、その回転軸５ｃが、
図２に示すように、現像容器２の両側壁２ａに軸受１０
を介して軸支され、駆動源（図示せず）により回転され
る。又、磁石ローラ５ａは、軸受７を介して現像スリー
ブ５ｂに担持される。The developing sleeve 5b has a rotating shaft 5c,
As shown in FIG. 2, bearings 10 are provided on both side walls 2a of the developing container 2.
And is rotated by a drive source (not shown). The magnet roller 5a is carried on the developing sleeve 5b via a bearing 7.
【０００６】現像スリーブ５ｂの回転により現像剤６
は、図１にて、磁石ローラ５ａのＮ1極で現像スリーブ
５ｂの外周表面に吸着され、更に、Ｓ1極→Ｎ2極→Ｓ2
極へと搬送される。The rotation of the developing sleeve 5b causes the developer 6
, At 1, is adsorbed to the outer circumferential surface of the developing sleeve 5b by N 1 pole of the magnet roller 5a, further, S 1 pole → N 2 pole → S 2
Transported to the pole.
【０００７】尚、現像剤６は、磁石ローラ５ａのＮ1極
に対向した位置に配置した規制ブレード１１により規制
され、現像スリーブ５ｂ上に現像剤６の薄層が形成され
る。磁石ローラ５ａのＳ1極は現像主極であり、像担持
体１００上の静電潜像を現像し、一方、Ｎ2極は現像後
の残留現像剤を取り込み、現像容器２内に搬送する。[0007] Incidentally, the developer 6, is regulated by the regulating blade 11 disposed at a position opposed to N 1 pole of the magnet roller 5a, a thin layer of the developer 6 is formed on the developing sleeve 5b. S 1 pole of the magnet roller 5a is the main developing pole, and developing an electrostatic latent image on the image bearing member 100, whereas, the N 2 pole captures remaining developer after development, conveyed to the developer container 2 .
【０００８】以上述べた現像装置１では、現像容器２内
と現像スリーブ５ｂ周面上とで、現像剤６の循環移動が
行なわれる。現像スリーブ５ｂ周面上の現像剤６は、磁
石ローラ５ａの磁力により保持されるが、現像スリーブ
５ｂを長期間回転させた場合には、現像剤６が現像スリ
ーブ５ｂの軸線方向へ移動し、更に、現像スリーブ５ｂ
の軸受７が位置する領域を越えて、現像容器側壁２ａ外
へと流出してしまう。In the developing device 1 described above, the developer 6 is circulated in the developing container 2 and on the peripheral surface of the developing sleeve 5b. The developer 6 on the peripheral surface of the developing sleeve 5b is held by the magnetic force of the magnet roller 5a, but when the developing sleeve 5b is rotated for a long time, the developer 6 moves in the axial direction of the developing sleeve 5b, Further, the developing sleeve 5b
Out of the developing container side wall 2a beyond the region where the bearing 7 is located.
【０００９】従来、斯る現像剤の現像スリーブ５ｂの端
部側への流出を防止するために、図２に示すように、現
像スリーブ５ｂの非現像剤担持域、即ち、現像スリーブ
５ｂの両端部周面に弾性体、不織布などの端部シール部
材８を設け、現像容器側壁２ａと現像スリーブ端部周面
との空隙を密着、閉鎖することが知られている。図３に
示すように、シール部材８としては、弾性のシール部材
を使用することもある。Conventionally, as shown in FIG. 2, a non-developer carrying area of the developing sleeve 5b, that is, both ends of the developing sleeve 5b, in order to prevent the developer from flowing to the end of the developing sleeve 5b. It is known that an end seal member 8 such as an elastic body or a non-woven fabric is provided on the peripheral surface of the developing unit, and the gap between the side wall 2a of the developing container and the peripheral surface of the end of the developing sleeve is tightly closed. As shown in FIG. 3, an elastic seal member may be used as the seal member 8.
【００１０】[0010]
【発明が解決しようとする課題】しかしながら、前述し
た端部シール部材８では、端部シール部材８と現像スリ
ーブ周面との隙間に、僅かではあるが現像剤の進入が生
じ、長期間使用した場合には、現像剤の漏れ出しが発生
することが知られている。However, in the above-mentioned end seal member 8, a small amount of developer enters the gap between the end seal member 8 and the peripheral surface of the developing sleeve, and the end seal member 8 has been used for a long time. In such a case, it is known that leakage of the developer occurs.
【００１１】現像剤の漏れ出しの原因の一つには、現像
スリーブ５ｂ内の磁石ローラ５ａの全長と、現像スリー
ブ５ｂの現像剤担持域と、シール部材８との位置関係が
挙げられる。One of the causes of the leakage of the developer is the positional relationship between the entire length of the magnet roller 5a in the developing sleeve 5b, the developer carrying area of the developing sleeve 5b, and the seal member 8.
【００１２】磁石ローラ５ａは、一般に端面側の磁力が
不均一となるために、即ち、磁石ローラ５ａの端部では
磁界が端面方向の成分を有し磁力線の描く弧が大きくな
るために、通常、磁石ローラ５ａの全長は、図２に示す
ように、画像形成するための現像剤担持域の幅より、両
側に２〜４ｍｍ程度延長した長さを有している。The magnet roller 5a generally has a non-uniform magnetic force on the end face side, that is, because the magnetic field has a component in the end face direction at the end of the magnet roller 5a and the arc drawn by the magnetic force lines is large, so that the magnet roller 5a generally has an arc. As shown in FIG. 2, the entire length of the magnet roller 5a has a length extending about 2 to 4 mm on both sides of the width of the developer carrying area for forming an image.
【００１３】一方、シール部材８は、上述したように、
現像スリーブ５ｂ周面に担持した現像剤が外部に、主と
して、現像スリーブ軸受７の側に漏れ出すのを防止する
もので、その位置は、現像スリーブ５ｂの画像形成する
ための現像剤担持域近傍としている。従って、磁石ロー
ラ５ａの全長からして、磁石ローラ５ａの磁力は、シー
ル部材８が現像スリーブ５ｂ周面と接する位置まで働く
ことになる。On the other hand, as described above, the seal member 8
This prevents the developer carried on the peripheral surface of the developing sleeve 5b from leaking outside, mainly to the side of the developing sleeve bearing 7, and is located in the vicinity of the developer carrying area for forming an image on the developing sleeve 5b. And Therefore, considering the entire length of the magnet roller 5a, the magnetic force of the magnet roller 5a acts to a position where the seal member 8 contacts the peripheral surface of the developing sleeve 5b.
【００１４】このことから、現像スリーブ５ｂ周面に担
持した現像剤は、磁石ローラ５ａの磁力によりシール部
材８側へと移動することとなり、現像剤の漏れ出しの原
因となっていた。As a result, the developer carried on the peripheral surface of the developing sleeve 5b moves toward the seal member 8 due to the magnetic force of the magnet roller 5a, causing the developer to leak out.
【００１５】現像剤の漏れ出しを防止する方法として
は、シール部材８の現像スリーブ５ｂ周面への密着力を
増大させる方法がある。しかし、シール部材８の密着力
を強くすると、現像スリーブ５ｂの回転トルクの増加
や、現像スリーブ５ｂとシール部材８との摺擦により現
像スリーブ５ｂが昇温し、現像剤の現像スリーブ５ｂへ
の融着といった問題が発生する。As a method of preventing the leakage of the developer, there is a method of increasing the adhesion of the seal member 8 to the peripheral surface of the developing sleeve 5b. However, if the adhesion force of the sealing member 8 is increased, the temperature of the developing sleeve 5b rises due to an increase in the rotational torque of the developing sleeve 5b and the rubbing between the developing sleeve 5b and the sealing member 8, and the developer adheres to the developing sleeve 5b. Problems such as fusion occur.
【００１６】又、磁石ローラ５ａの全長を、画像形成す
るための現像剤担持域と同等の長さとして、即ち、磁石
ローラ５ａの磁力がシール部材８側に及ばない長さとな
るように設定して、現像剤がシール部材８に進入するの
を防止する方法があるが、この方法では、前述したよう
に磁石ローラ５ａの端部における磁力の不安定領域が、
画像形成するための現像剤担持域の範囲内となるため、
画像濃度のむら等を引き起こすこととなり、画像に悪影
響を及ぼす。Further, the total length of the magnet roller 5a is set to be equal to the length of the developer carrying area for forming an image, that is, set so that the magnetic force of the magnet roller 5a does not reach the seal member 8 side. Thus, there is a method of preventing the developer from entering the seal member 8, but in this method, as described above, the unstable region of the magnetic force at the end of the magnet roller 5a is
Because it is within the range of the developer carrying area for image formation,
This causes unevenness in image density and the like, which adversely affects the image.
【００１７】従って、本発明の目的は、現像剤担持体に
担持する現像剤が、現像剤担持体の端部側へと流出する
のを防止することのできる現像装置を提供することであ
る。Accordingly, it is an object of the present invention to provide a developing device capable of preventing a developer carried on a developer carrying member from flowing toward an end of the developer carrying member.
【００１８】本発明の他の目的は、現像剤担持体の端部
に設けたシール部材のシール効果を高めると共に、シー
ル部材の現像剤担持体への密着圧を軽減することのでき
る現像装置を提供することである。Another object of the present invention is to provide a developing device capable of enhancing the sealing effect of a seal member provided at an end of a developer carrying member and reducing the pressure of the seal member to the developer carrying member. To provide.
【００１９】[0019]
【課題を解決するための手段】上記諸目的は本発明に係
る現像装置にて達成される。要約すれば、本発明による
と、磁性粒子を含む現像剤を収容する現像容器と、前記
現像容器に回動自在に支持され、内部に磁石を備え前記
現像剤を担持搬送する現像剤担持体と、前記現像剤担持
体に担持された現像剤の層の厚さを規制する規制ブレー
ドと、前記現像剤担持体の端部と所定の間隙をもって前
記規制ブレード近傍から前記現像剤担持体の周面に沿っ
て延びて設けられた磁性部材と、を有する現像装置にお
いて、前記磁性部材及び前記規制ブレードは、前記現像
剤担持体に印加される現像バイアス電位と同じ電位とさ
れることを特徴とする現像装置が提供される。The above objects are attained by the developing apparatus according to the present invention. In summary, according to the present invention, a developer container that contains a developer containing magnetic particles, and a developer carrier that is rotatably supported by the developer container, has a magnet inside, and carries and carries the developer. A regulating blade for regulating the thickness of a layer of developer carried on the developer carrier, and a peripheral surface of the developer carrier from near the regulating blade with a predetermined gap from an end of the developer carrier. Wherein the magnetic member and the regulating blade are set to the same potential as a developing bias potential applied to the developer carrier. A developing device is provided.
【００２０】[0020]
【実施例】以下、本発明に係る現像装置を図面に則して
更に詳しく説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The developing device according to the present invention will be described below in more detail with reference to the drawings.
【００２１】本発明は、図１に示すような、磁性トナー
から成る一成分現像剤のように磁性粒子を用いた現像装
置に具現化することができ、その全体の構成及び作用に
ついては、前述した通りであるので、その説明は省略す
る。The present invention can be embodied in a developing device using magnetic particles such as a one-component developer composed of a magnetic toner as shown in FIG. Therefore, the description is omitted.
【００２２】又、図８に概略図示するように、現像スリ
ーブ周面に担持した現像剤が現像スリーブ端部へと移動
し流出するのを防止する手段としては、現像スリーブ５
ｂの外周に現像スリーブ５ｂと僅かの間隙を設けて磁性
部材２０を配置し、この磁性部材２０の外側端面が磁石
ローラ５ａの外側端面と大略整列するように構成するこ
とが提案されている。As schematically shown in FIG. 8, as means for preventing the developer carried on the peripheral surface of the developing sleeve from moving to the end of the developing sleeve and flowing out, the developing sleeve 5 is used.
It has been proposed that a magnetic member 20 is disposed with a slight gap provided between the outer peripheral surface of the magnetic member b and the developing sleeve 5b, and the outer end surface of the magnetic member 20 is substantially aligned with the outer end surface of the magnet roller 5a.
【００２３】図７に図示されるが、磁性部材２０を配置
しない場合には、現像スリーブ５ｂ内の磁石ローラ５ａ
の磁力は、磁石ローラ５ａの側端面側にも発生している
が、磁性部材２０を配置した場合には、図８に図示する
ように、磁石ローラ５ａの側端面で現像スリーブ軸受１
０の側に発生していた磁力は、全て磁石部材２０の方向
に向く。このことから、現像スリーブ外周上に担持した
現像剤は、現像スリーブ内磁石ローラ５ａと、磁石部材
２０との磁力により、現像スリーブ軸受１０側への流出
が防止される。As shown in FIG. 7, when the magnetic member 20 is not provided, the magnet roller 5a in the developing sleeve 5b is provided.
Magnetic force is also generated on the side end face side of the magnet roller 5a. However, when the magnetic member 20 is disposed, as shown in FIG. 8, the developing sleeve bearing 1 is located on the side end face of the magnet roller 5a.
The magnetic force generated on the zero side is all directed toward the magnet member 20. Thus, the developer carried on the outer periphery of the developing sleeve is prevented from flowing out to the developing sleeve bearing 10 due to the magnetic force between the magnet roller 5a in the developing sleeve and the magnet member 20.
【００２４】一方、図４に示すように、現像装置には、
現像スリーブ５ｂに現像バイアスを印加し、現像剤を現
像スリーブ表面から像担持体１００へと飛翔（ジャン
プ）させ、像担持体表面の潜像に付着させる、所謂、ジ
ャンピング現像方式を採用するものがある。現像バイア
スとしては、ＡＣ電圧１０１を単独で印加する場合、及
び図４に示すように、ＡＣ電圧１０１に直流電圧１０２
を重畳したものが使用される場合がある。On the other hand, as shown in FIG.
A so-called jumping development method is used in which a developing bias is applied to the developing sleeve 5b to cause the developer to fly (jump) from the surface of the developing sleeve to the image carrier 100 and adhere to a latent image on the surface of the image carrier. is there. As the developing bias, when the AC voltage 101 is applied alone, or as shown in FIG.
May be used.
【００２５】いずれの場合においても、現像バイアスを
使用する現像装置において、シール部材として磁性部材
２０を設けた場合には、現像スリーブ５ｂ及び現像剤規
制ブレード１１と、磁性部材２０とで形成された磁界の
中の現像剤が、現像バイアスに起因した電位差によって
移動され、このために、現像剤は現像スリーブ５ｂの端
部へと流出し易くなること分かった。即ち、換言すれ
ば、磁性部材２０による現像剤のシール性能が低下する
こととなる。In any case, when the magnetic member 20 is provided as a seal member in the developing device using the developing bias, the magnetic member 20 is formed by the developing sleeve 5b, the developer regulating blade 11, and the magnetic member 20. It has been found that the developer in the magnetic field is moved by the potential difference caused by the developing bias, so that the developer easily flows out to the end of the developing sleeve 5b. That is, in other words, the sealing performance of the developer by the magnetic member 20 is reduced.
【００２６】図４〜図６に本発明の一実施例を示す。こ
の実施例によれば、現像スリーブの端部シール部材とし
て磁性部材を使用した現像装置が著しく改良され、磁性
部材によるシール効果が大幅に向上する。4 to 6 show one embodiment of the present invention. According to this embodiment, the developing device using a magnetic member as the end seal member of the developing sleeve is remarkably improved, and the sealing effect by the magnetic member is greatly improved.
【００２７】本実施例の現像装置の全体構成が図４に示
される。この実施例の現像装置において、現像スリーブ
５ｂ内の磁石ローラ５ａはその長手方向の長さが、現像
容器２内の現像剤収容範囲よりも十分に長くされる。図
５に示すように、現像剤シール部材を構成する磁性部材
２０は、その外側端面が現像スリーブ内磁石ローラ５ａ
の外側端面と大略整列して同等位置に配置され、その内
側端面は現像容器２の内壁２ａと大略一致するように、
幅Ｗにて形成される。FIG. 4 shows the overall configuration of the developing device of this embodiment. In the developing device of this embodiment, the length of the magnet roller 5a in the developing sleeve 5b in the longitudinal direction is sufficiently longer than the developer accommodating range in the developing container 2. As shown in FIG. 5, the magnetic member 20 constituting the developer seal member has an outer end surface having a magnet roller 5a in the developing sleeve.
Are arranged substantially at the same position in alignment with the outer end surface of the developer container, and the inner end surface thereof substantially coincides with the inner wall 2 a of the developing container 2.
It is formed with a width W.
【００２８】又、磁性部材２０は、現像スリーブ５ｂの
外周表面との間に空隙Ｇを有し、且つ現像スリーブ５ｂ
の外周を囲包する態様で、現像スリーブ５ｂに沿って湾
曲して配置される。The magnetic member 20 has a gap G between itself and the outer peripheral surface of the developing sleeve 5b.
Are arranged along the developing sleeve 5b so as to surround the outer periphery of the developing sleeve 5b.
【００２９】本発明に従えば、磁性部材２０は、厚さ
（ｔ）が、０．５ｍｍ〜２ｍｍ程度の板材で、鉄板、ニ
ッケル板、又は磁性ステンレス板などの強磁性板で作製
される。According to the present invention, the magnetic member 20 is a plate having a thickness (t) of about 0.5 mm to 2 mm, and is made of a ferromagnetic plate such as an iron plate, a nickel plate, or a magnetic stainless plate.
【００３０】磁性部材２０と現像スリーブ５ｂの外周表
面との空隙Ｇ（図５）は、０．３ｍｍ〜０．７ｍｍ程度
で良いが、現像剤の種類、例えば粒子の大きさなどによ
って決定されるものであり、この値に限定されるもので
はない。The gap G (FIG. 5) between the magnetic member 20 and the outer peripheral surface of the developing sleeve 5b may be about 0.3 mm to 0.7 mm, but is determined by the type of developer, for example, the size of particles. Is not limited to this value.
【００３１】又、磁性部材２０の外側端面は、現像スリ
ーブ内の磁石ローラ５ａの外側端面と一致させることが
望ましいが、現像スリーブ５ｂ及び磁石ローラ５ａの寸
法精度及び組立精度などを考慮して、現像スリーブ内磁
石ローラ５ａの外側端面より現像スリーブ軸受１０側に
−１ｍｍ〜２ｍｍの範囲が有効である。一方、磁性部材
２０の幅Ｗの他端面は、現像容器２の内壁面２ａと大略
一致させる。しかし、現像装置の構成上の関係で、特に
限定するものではない。It is desirable that the outer end surface of the magnetic member 20 coincides with the outer end surface of the magnet roller 5a in the developing sleeve. However, the dimensional accuracy and assembly accuracy of the developing sleeve 5b and the magnet roller 5a are taken into consideration. A range of -1 mm to 2 mm is effective on the side of the developing sleeve bearing 10 from the outer end surface of the magnet roller 5a in the developing sleeve. On the other hand, the other end surface of the width W of the magnetic member 20 is made substantially coincident with the inner wall surface 2a of the developing container 2. However, there is no particular limitation on the configuration of the developing device.
【００３２】更に、現像スリーブ５ｂ上の現像剤を規制
し、現像スリーブ５ｂ上に現像剤の薄層を形成するため
の規制ブレード１１は、現像スリーブ内磁石ローラ５ａ
の外側端面と、規制ブレード１１の端面とが大略同位置
に配置することが望ましい。即ち、現像スリーブ内磁石
ローラ５ａの全長と規制ブレード１１の全長が同等とさ
れる。尚、規制ブレードと磁石ローラとの配置関係は、
前述した磁性部材２０との関係と同様に、規制ブレード
１１の端部が現像スリーブ内磁石ローラ５ａの側端面よ
り現像スリーブ軸受１０側に、−１ｍｍ〜２ｍｍの範囲
が有効である。Further, the regulating blade 11 for regulating the developer on the developing sleeve 5b and forming a thin layer of the developer on the developing sleeve 5b includes a magnet roller 5a in the developing sleeve.
It is desirable that the outer end face of the control blade 11 and the end face of the regulating blade 11 be disposed at substantially the same position. That is, the entire length of the magnet roller 5a in the developing sleeve is equal to the entire length of the regulating blade 11. The arrangement relationship between the regulating blade and the magnet roller is as follows.
Similar to the relationship with the magnetic member 20 described above, the range of -1 mm to 2 mm is effective when the end of the regulating blade 11 is closer to the developing sleeve bearing 10 than the side end surface of the magnet roller 5a in the developing sleeve.
【００３３】次に、本実施例の現像装置における磁性部
材２０の作用について説明する。Next, the operation of the magnetic member 20 in the developing device of this embodiment will be described.
【００３４】図４に示すように、本実施例によれば、現
像スリーブ５ｂに現像バイアスが印加される。As shown in FIG. 4, according to the present embodiment, a developing bias is applied to the developing sleeve 5b.
【００３５】つまり、図４及び図５において、現像バイ
アスは、ＡＣ電圧１０１にＤＣ電圧１０２を加えたもの
で、現像スリーブ５ｂの回動軸５ｃ及び現像剤規制ブレ
ード１１に印加される。本発明によれば、図６に図示す
るように、磁性部材２０は、導通部材１０３によって規
制ブレード１１と電気的に接続され、従って、現像スリ
ーブ５ｂと磁性部材２０とは同電位とされる。通常、磁
性部材２０は導電性を有しているので、導通部材１０３
を設けることなく、単に磁性部材２０を規制ブレード１
１に当接するだけで磁性部材２０と規制ブレード１１の
電気的接続は達成されるであろう。That is, in FIGS. 4 and 5, the developing bias is obtained by adding the DC voltage 102 to the AC voltage 101, and is applied to the rotating shaft 5c of the developing sleeve 5b and the developer regulating blade 11. According to the present invention, as shown in FIG. 6, the magnetic member 20 is electrically connected to the regulating blade 11 by the conductive member 103, and therefore, the developing sleeve 5b and the magnetic member 20 are set to the same potential. Usually, since the magnetic member 20 has conductivity, the conductive member 103
Without providing the magnetic member 20 with the regulating blade 1.
The electrical connection between the magnetic member 20 and the regulating blade 11 will be achieved only by abutting on the contact member 1.
【００３６】上述したように、図８及び図５にて明らか
なように、本実施例の現像装置によれば、現像スリーブ
５ｂの端部側で磁性部材１０に対応する位置の現像剤
は、現像スリーブ５ｂ内の磁石ローラ５ａと磁性部材１
０とで形成される磁界によって拘束される。As described above, as apparent from FIGS. 8 and 5, according to the developing device of the present embodiment, the developer at the position corresponding to the magnetic member 10 on the end side of the developing sleeve 5b is: Magnet roller 5a and magnetic member 1 in developing sleeve 5b
0 and is constrained by the magnetic field formed.
【００３７】更に、本実施例によれば、現像スリーブ５
ｂと磁性部材２０との間に電位差がないために、上述し
たような現像スリーブ５ｂと磁性部材２０との間の電位
差により生じる現像剤の移動が有効に防止され、従っ
て、磁性部材２０のシール効果、つまり、現像剤の拘束
力を最大限に確保することが可能となり、現像剤の現像
スリーブ端部側への流出が防止される。Further, according to this embodiment, the developing sleeve 5
Since there is no potential difference between the magnetic member 20 and the magnetic member 20, the movement of the developer caused by the potential difference between the developing sleeve 5b and the magnetic member 20 as described above is effectively prevented. The effect, that is, the maximum binding force of the developer can be ensured, and the developer is prevented from flowing to the end of the developing sleeve.
【００３８】更に又、本実施例によれば、磁性部材２０
が現像スリーブ５ｂに対して非接触の構成とされるため
に、現像スリーブの回転負荷の低減と現像スリーブの摺
擦による昇温がなくなり、現像剤の融着といった問題を
も解決することができる。又、補助的なシール材を必要
とせず、従って、組立性や、コストの低減といった効果
をも奏し得る。Furthermore, according to this embodiment, the magnetic member 20
Is not in contact with the developing sleeve 5b, so that the rotational load of the developing sleeve is reduced, the temperature rise due to the rubbing of the developing sleeve is eliminated, and problems such as fusion of the developer can be solved. . Further, an auxiliary sealing material is not required, and therefore, effects such as assemblability and cost reduction can be obtained.
【００３９】[0039]
【発明の効果】以上説明したように、本発明の現像装置
は、現像スリーブのような現像剤担持体と、磁性部材
と、規制ブレードとの間に電位差がないために、現像ス
リーブと磁性部材との間の電位差により生じる現像剤の
移動が有効に防止され、従って、磁性部材のシール効
果、つまり、現像剤の拘束力を最大限に確保することが
可能となり、現像剤の現像スリーブ端部側への流出が防
止される。更に又、磁性部材が現像スリーブに対して非
接触の構成とされるために、現像スリーブの回転負荷の
低減と現像スリーブの摺擦による昇温がなくなり、現像
剤の融着といった問題をも解決することができる。又、
補助的なシール材を必要とせず、従って、組立性や、コ
ストの低減といった効果をも奏し得る。As described above, in the developing device of the present invention, since there is no potential difference between the developer carrier such as the developing sleeve, the magnetic member and the regulating blade, the developing sleeve and the magnetic member The movement of the developer caused by the potential difference between the developer and the developer is effectively prevented, and therefore, the sealing effect of the magnetic member, that is, the binding force of the developer can be maximized. Outflow to the side is prevented. Furthermore, since the magnetic member is configured to be in non-contact with the developing sleeve, the problem of reduction in the rotational load of the developing sleeve and elimination of temperature rise due to rubbing of the developing sleeve is eliminated, thereby solving the problem of fusion of the developer. can do. or,
Since no auxiliary sealing material is required, effects such as ease of assembly and cost reduction can be achieved.
【図１】従来の現像装置の横断面図である。FIG. 1 is a cross-sectional view of a conventional developing device.
【図２】従来の現像装置の一部正面断面図である。FIG. 2 is a partial front sectional view of a conventional developing device.
【図３】従来の現像装置の一部正面断面図である。FIG. 3 is a partial front sectional view of a conventional developing device.
【図４】本発明の現像装置の横断面図である。FIG. 4 is a cross-sectional view of the developing device of the present invention.
【図５】本発明の現像装置の構成及び作用を説明する一
部断面正面図である。FIG. 5 is a partial cross-sectional front view illustrating the configuration and operation of the developing device of the present invention.
【図６】本発明の現像装置の一部正面図である。FIG. 6 is a partial front view of the developing device of the present invention.
【図７】従来の現像装置の作用を説明する一部断面正面
図である。FIG. 7 is a partial cross-sectional front view illustrating the operation of a conventional developing device.
【図８】従来の現像装置の作用を説明する一部断面正面
図である。FIG. 8 is a partial cross-sectional front view illustrating the operation of a conventional developing device.
２ 現像容器 ５ 現像剤担持体 ５ａ 磁石ローラ ５ｂ 現像スリーブ ８ シール部材 ２０ 磁性部材 2 Developing container 5 Developer carrier 5a Magnet roller 5b Developing sleeve 8 Seal member 20 Magnetic member
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特公 昭63−16739（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.7，ＤＢ名) G03G 15/06 - 15/095 ────────────────────────────────────────────────── ─── Continued on the front page (56) References JP-B-63-16739 (JP, B2) (58) Fields investigated (Int. Cl. 7 , DB name) G03G 15/06-15/095
Claims (1)
器と、前記現像容器に回動自在に支持され、内部に磁石
を備え前記現像剤を担持搬送する現像剤担持体と、前記
現像剤担持体に担持された現像剤の層の厚さを規制する
規制ブレードと、前記現像剤担持体の端部と所定の間隙
をもって前記規制ブレード近傍から前記現像剤担持体の
周面に沿って延びて設けられた磁性部材と、を有する現
像装置において、 前記磁性部材及び前記規制ブレードは、前記現像剤担持
体に印加される現像バイアス電位と同じ電位とされるこ
とを特徴とする現像装置。1. A developer container containing a developer containing magnetic particles, a developer carrier rotatably supported by the developer container and having a magnet inside to carry and transport the developer, and the developer A regulating blade for regulating the thickness of the developer layer carried on the carrier, and extending along the peripheral surface of the developer carrier from the vicinity of the regulating blade with a predetermined gap from an end of the developer carrier. Wherein the magnetic member and the regulating blade have the same potential as a developing bias potential applied to the developer carrier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001151655A JP3323864B2 (en) | 2001-05-21 | 2001-05-21 | Developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001151655A JP3323864B2 (en) | 2001-05-21 | 2001-05-21 | Developing device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12430792A Division JP3270516B2 (en) | 1992-04-17 | 1992-04-17 | Developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002006624A JP2002006624A (en) | 2002-01-11 |
| JP3323864B2 true JP3323864B2 (en) | 2002-09-09 |
Family
ID=18996456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001151655A Expired - Lifetime JP3323864B2 (en) | 2001-05-21 | 2001-05-21 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3323864B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197524B (en) * | 2012-12-28 | 2015-09-23 | 珠海天威飞马打印耗材有限公司 | A kind of device and method regulating developing bias |
-
2001
- 2001-05-21 JP JP2001151655A patent/JP3323864B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002006624A (en) | 2002-01-11 |
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