JPH0336575A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPH0336575A JPH0336575A JP17233489A JP17233489A JPH0336575A JP H0336575 A JPH0336575 A JP H0336575A JP 17233489 A JP17233489 A JP 17233489A JP 17233489 A JP17233489 A JP 17233489A JP H0336575 A JPH0336575 A JP H0336575A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- magnetic roller
- regulating member
- magnetic
- 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.)
- Pending
Links
- 230000001105 regulatory effect Effects 0.000 claims abstract description 26
- 239000006229 carbon black Substances 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 239000006249 magnetic particle Substances 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 238000009751 slip forming Methods 0.000 description 3
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- -1 polyurethane rubber Chemical compound 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229910000906 Bronze Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- 229910000828 alnico Inorganic materials 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Magnetic Brush Developing In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、磁気ブラシ現像装置に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a magnetic brush developing device.
［従来の技術］
従来の現像装置は、磁気ブラシ現像装置として公知のよ
うに現像スリーブとも呼称される回転可能な非磁性かつ
導電性の円筒状の現像剤搬送部材の内部に複数の磁極に
着磁された円筒状の磁性体ローラーを有し、磁性体ロー
ラーにより発生する磁場により現像剤搬送部材上に現像
剤を保持し、磁性体ローラーと現像剤搬送部材のうち少
なくとも一方を回転させて現像剤搬送部材上の現像剤を
搬送するものであった。尚、公知のように現゛像剤とし
てはトナーのみにより構成される１成分現像剤とトナー
とキャリアにより構成される２成分現像剤が挙げられる
。[Prior Art] A conventional developing device, known as a magnetic brush developing device, has a plurality of magnetic poles attached to the inside of a rotatable non-magnetic and conductive cylindrical developer conveying member, also called a developing sleeve. It has a magnetized cylindrical magnetic roller, holds the developer on the developer transport member by a magnetic field generated by the magnetic roller, and develops by rotating at least one of the magnetic roller and the developer transport member. It was used to transport the developer on the agent transport member. As is well known, the developer includes a one-component developer made up of only toner and a two-component developer made up of toner and carrier.
このような現像装置においては、磁性体ローラーの外径
の研磨加工及び現像剤搬送部材の外径加工や、磁性体ロ
ーラーを現像剤搬送部材と微小な空隙を隔てて精度良く
配設する必要があり、工数及びコストの増大の原因とな
っていた。また、磁性体ローラーや現像剤搬送部材やそ
れぞれを支持するための部品など現像装置の構成部品が
多く、現像装置の小型軽量化が不可能であった。さらに
、磁性体ローラーを回転させた場合に画像に生じる磁性
体ローラーの磁極ピッチによる現像温度ムラを低減する
ために磁性体ローラーの着磁極数を増すと、現像剤搬送
部材上で充分な漏洩磁束が確保されず、現像剤の搬送量
を充分に確保することができなかった。In such a developing device, it is necessary to polish the outer diameter of the magnetic roller, to process the outer diameter of the developer conveying member, and to precisely arrange the magnetic roller with a small gap between the magnetic roller and the developer conveying member. This caused an increase in man-hours and costs. Furthermore, the developing device has many components such as a magnetic roller, a developer conveying member, and parts for supporting each component, making it impossible to reduce the size and weight of the developing device. Furthermore, if the number of magnetized poles of the magnetic roller is increased in order to reduce the unevenness of development temperature caused by the magnetic pole pitch of the magnetic roller that occurs in the image when the magnetic roller is rotated, sufficient leakage magnetic flux will be generated on the developer transport member. Therefore, it was not possible to secure a sufficient amount of developer to be transported.
〔発明が解決しようとする課題］
そこで、本出願人はこのような問題点を解決する現像装
置として、磁性体ローラーの表面で直接現像剤を搬送す
る現像装置を考案したが、磁性体ローラーの磁極ピッチ
による現像剤搬送量ムラのない均一なトナー薄層を安定
して形成することが困難であり、高品質な画像を長期間
安定して形成することができないという問題点を有して
いた。[Problems to be Solved by the Invention] Therefore, the applicant devised a developing device that conveys developer directly on the surface of a magnetic roller as a developing device that solves these problems. It was difficult to stably form a uniform thin layer of toner with no unevenness in the amount of developer conveyed due to the magnetic pole pitch, and the problem was that high-quality images could not be stably formed over a long period of time. .
そこで本発明はこのような問題点を解決するもので、そ
の目的とするところは、高品質な画像を長期間安定して
形成しつる現像装置を提供するところにある。SUMMARY OF THE INVENTION The present invention is intended to solve these problems, and its purpose is to provide a developing device that can stably form high-quality images over a long period of time.
［課題を解決するための手段］
本発明の現像装置は、複数の磁極に着磁された円筒状の
磁性体ローラーを有し、前記、′＠磁性体ローラーより
発生する磁場により現像剤を前記磁性体ローラー上に保
持し、前記磁性体ローラーを回転させて前記現像剤を搬
送する現像装置において、前記磁性体ローラーに現像剤
搬送量規制部材が圧接していることを特徴とする。[Means for Solving the Problems] The developing device of the present invention has a cylindrical magnetic roller magnetized with a plurality of magnetic poles, and the developer is transferred to the developer by the magnetic field generated by the magnetic roller. The developing device is held on a magnetic roller and rotates the magnetic roller to convey the developer, characterized in that a developer conveyance amount regulating member is in pressure contact with the magnetic roller.
また、本発明の現像装置は、前記磁性体ローラーと前記
現像剤搬送１規制部材とを面接触とし、かつ前記現像剤
搬送量規制部材の端部が前記磁性体ローラーに非接触で
あることを特徴とする特徴とする。Further, in the developing device of the present invention, the magnetic roller and the developer transport 1 regulating member are in surface contact with each other, and an end portion of the developer transport amount regulating member is not in contact with the magnetic roller. Characteristic characteristics.
［作用］
本発明の上記の構成によれば、磁性体ローラーと現像剤
搬送量規制部材との間を現像剤が通過する際に、磁性体
ローラー上の現像剤に加えられる圧力が増加するために
磁性体ローラーにより搬送される現像剤は薄層化され、
さらに磁性体ローラーと弾性体である現像剤搬送量規制
部材を面接触させることにより接触面には均一な応力が
加えられるために均一な現像剤層を安定的に形成できる
ため、高品質な画像を安定して形成することが可能とな
る。[Function] According to the above configuration of the present invention, when the developer passes between the magnetic roller and the developer transport amount regulating member, the pressure applied to the developer on the magnetic roller increases. The developer transported by the magnetic roller is made into a thin layer,
Furthermore, by bringing the magnetic roller and the elastic developer transport amount regulating member into surface contact, uniform stress is applied to the contact surface, which allows a uniform developer layer to be stably formed, resulting in high-quality images. It becomes possible to form stably.
以下、実施例により本発明の詳細な説明する。Hereinafter, the present invention will be explained in detail with reference to Examples.
［実施例］
第１図に本発明の実施例における現像装置を含む画像形
成装置の断面概観図を示す。[Embodiment] FIG. 1 shows a cross-sectional schematic view of an image forming apparatus including a developing device in an embodiment of the present invention.
図中Ａに示す方向に回転する潜像担持体１は導電性の支
持体２の上に光導電性を有する感光層３を塗膜したもの
であって、感光層３を帯電器４により所定の電位になる
ように帯電させた後に画像に応じて光源５から出射した
光を結像光学系６により感光層３に結像させて電位コン
トラストを得て潜像担持体１上に静電潜像を形成する。A latent image carrier 1 rotating in the direction indicated by A in the figure has a photoconductive layer 3 coated on a conductive support 2. After being charged to a potential of form an image.
現像装置Ｉ７は現像剤の構成要素である現像剤８を帯電
させ、かつ現像剤８を図中Ｂに示す方向に回転する円筒
状の磁性体ローラー９で搬送するものである。磁性体ロ
ーラー９上に磁気力により保持された現像剤８°は現像
剤搬送量規制部材１０により適量に規制された後に潜像
担持体１と磁性体ローラー９が近接する現像ギャップ部
に搬送され、潜像担持体１上の静電潜像の電位ポテンシ
ャル及び現像バイアス電圧印加手段である電ｆｉｌｌに
よるバイアス電圧に応じて現像剤８が潜像担持体１の静
電潜像に付着することによって潜像担持体１上の静電潜
像が顕像化される。The developing device I7 charges the developer 8, which is a component of the developer, and conveys the developer 8 with a cylindrical magnetic roller 9 rotating in the direction shown by B in the figure. The developer 8° held by the magnetic force on the magnetic roller 9 is regulated to an appropriate amount by the developer conveyance amount regulating member 10, and then conveyed to the development gap portion where the latent image carrier 1 and the magnetic roller 9 are close to each other. , the developer 8 adheres to the electrostatic latent image on the latent image carrier 1 in accordance with the potential of the electrostatic latent image on the latent image carrier 1 and the bias voltage from the electric fill which is a developing bias voltage applying means. The electrostatic latent image on the latent image carrier 1 is visualized.
ここで、現像剤搬送量規制部材１０は例えばリン青銅あ
るいはステンレスなどの弾性を有する金属あるいはポリ
ウレタンゴムなどのエラストマーにより形成され、現像
剤搬送量規制部材１０の自由端、すなわち現像剤８の流
れからみて下流側に位置するエツジが磁性体ローラー９
に接触せず、その自由端を除く面が圧接かつ面接触して
いる。Here, the developer transport amount regulating member 10 is formed of an elastic metal such as phosphor bronze or stainless steel, or an elastomer such as polyurethane rubber, and is formed from the free end of the developer transport amount regulating member 10, that is, from the flow of the developer 8. The edge located on the downstream side is the magnetic roller 9.
The surfaces other than the free end are in pressure contact and surface contact.
このような構成によれば、磁性体ローラー９を図中Ａの
方向に回転させると、磁性体ローラー９の回転に従い現
像剤８は磁性体ローラー９に沿って現像剤搬送量規制部
材１０の圧接力下へ搬送される。現像剤搬送量規制部材
１０は磁性体ローラー９に対して現像剤搬送量規制部材
１０の自由端が磁性体ローラー９に非接触となるように
面接触しているため、現像剤搬送量規制部材１０による
磁性体ローラー９への圧接力が均一化され、非常に高い
圧接力下においても、言い換えれば幅広い範囲の圧接力
下においても、さらには塑性変形し易いあるいは自己凝
集性の強い現像剤を用いる場合に於いても均一な厚さの
現像剤薄層を安定して形成できる。According to such a configuration, when the magnetic roller 9 is rotated in the direction A in the figure, the developer 8 is brought into pressure contact with the developer conveyance amount regulating member 10 along the magnetic roller 9 as the magnetic roller 9 rotates. Transported under force. Since the developer transport amount regulating member 10 is in surface contact with the magnetic roller 9 such that the free end of the developer transport amount regulating member 10 is not in contact with the magnetic roller 9, the developer transport amount regulating member 10 The pressing force applied to the magnetic roller 9 by the roller 10 is made uniform, and even under very high pressing force, in other words, under a wide range of pressing force, the developer that is easily plastically deformed or has a strong self-cohesive property can be used. Even when used, a thin developer layer of uniform thickness can be stably formed.
潜像担持体ｌ上のく静電潜像を現像した〉現像剤８が転
写器１２により記録紙１３に転写され、さらに加圧や加
熱等の手段により記録紙１３に定着されることによって
所望の画像を得ることができる。The developer 8 that has developed the electrostatic latent image on the latent image carrier L is transferred to the recording paper 13 by the transfer device 12, and further fixed on the recording paper 13 by means such as pressure or heating, thereby forming the desired image. images can be obtained.
尚、本実施例においては、第１図に示すよう１こ潜像担
持体１及び磁性体ローラー９の回転方向をそれぞれ図中
Ａ及びＢとして示したが、これは本発明を限定するもの
ではない、また、本発明においては、１成分磁気ブラシ
現像剤及び２成分磁気ブラシ現像剤として公知の現像剤
ならばすべて使用可能である。さらに、本発明に使用す
る磁性体ローラーの磁石材料としては、フェライト、ア
ルニコ、マンガンアルミ、希土類磁石等の公知の磁石材
料を使用することができるが、特に原子番号５８〜７１
（元素記号Ｃｅ−Ｌｕ）に至る１４Ｆ１１類の希土類元
素、その中でもＮｄ％ Ｐｒ及びＳｎｎに代表される希
土類元素の少なくとも１つに、Ｆｅ、Ｎｉ及びＣｏに代
表される３ｄ逼移金属の少なくとも１つを加えた希土類
磁石を使用することが望ましい。In this embodiment, as shown in FIG. 1, the rotational directions of the latent image carrier 1 and the magnetic roller 9 are indicated as A and B in the figure, respectively, but this is not intended to limit the present invention. Furthermore, in the present invention, any developer known as a one-component magnetic brush developer or a two-component magnetic brush developer can be used. Further, as the magnet material of the magnetic roller used in the present invention, known magnet materials such as ferrite, alnico, manganese aluminum, and rare earth magnets can be used, but in particular, atomic numbers 58 to 71
(Element symbol Ce-Lu), at least one of the rare earth elements represented by Nd% Pr and Snn, and at least one of the 3D migration metals represented by Fe, Ni and Co. It is desirable to use rare earth magnets with an additional
実施例１
本実施例においては、カーボンブラック、Ｆｅ３Ｏ４、
ポリエステル樹脂を主たる構成要素とする磁性粒子によ
る１成分現像剤を用いた。Example 1 In this example, carbon black, Fe3O4,
A one-component developer made of magnetic particles whose main component is polyester resin was used.
前記構成の現像装置による画像形成装置を用いて、Ａ４
サイズ普通紙５００００枚相当の画像を連続して形成し
たが、得られた画像の劣化は認められず、印字１枚目と
同様に、磁性体ローラー９上の現像剤層は安定的に均一
な厚さの薄層を形成しており解像度の高い高品質な画像
が得られた。Using the image forming apparatus with the developing device configured as described above, A4
Although images equivalent to 50,000 sheets of regular size paper were continuously formed, no deterioration of the obtained images was observed, and the developer layer on the magnetic roller 9 was stably and uniformly formed, as was the case with the first printed sheet. A thin layer was formed and a high-quality image with high resolution was obtained.
実施例２
本実施例においては、カーボンブラック、ポリエステル
樹脂を主たる構成要素とする樹脂粒子とキャリアである
軟磁性体粒子を混合した２成分現像剤を用いた。Example 2 In this example, a two-component developer was used in which resin particles containing carbon black and polyester resin as main constituents and soft magnetic particles as a carrier were mixed.
前記構成の現像装置による画像形成装置を用いて、Ａ４
サイズ普通紙５００００枚相当の画像を連続して形成し
たが、得られた画像の劣化は認められず、印字１枚目と
同様に、磁性体ローラー９上の現像剤層は安定的に均一
な厚さの薄層を形成しており解像度の高い高品質な画像
が得られた。Using the image forming apparatus with the developing device configured as described above, A4
Although images equivalent to 50,000 sheets of regular size paper were continuously formed, no deterioration of the obtained images was observed, and the developer layer on the magnetic roller 9 was stably and uniformly formed, as was the case with the first printed sheet. A thin layer was formed and a high-quality image with high resolution was obtained.
実施例３
本実施例においては、カーボンブラック、ワックス、Ｆ
ｅｔｕｓを主たる構成要素とする粒子をスチレン・アク
リル系樹脂により被覆したの磁性粒子による１戒分現像
剤を用いた。Example 3 In this example, carbon black, wax, F
A one-command developer consisting of magnetic particles containing etus as a main constituent and coated with a styrene/acrylic resin was used.
前記構成の現像装置による画像形成装置を用いて、Ａ４
サイズ普通紙５００００枚相当の画像を連続して形成し
たが、得られた画像の劣化は認められず、印字１枚目と
同様に、磁性体ローラー９上の現像剤層は安定的に均一
な厚さの薄層を形成しており解像度の高い高品質な画像
が得られた。Using the image forming apparatus with the developing device configured as described above, A4
Although images equivalent to 50,000 sheets of regular size paper were continuously formed, no deterioration of the obtained images was observed, and the developer layer on the magnetic roller 9 was stably and uniformly formed, as was the case with the first printed sheet. A thin layer was formed and a high-quality image with high resolution was obtained.
以上実施例を述べたが、本発明は以上の実施例のみなら
ず、広く電子写真記録装置などの画像形成装置、例えば
ページプリンタ、ファクシミリ、複写機などに応用すれ
ば特に有効である。Although the embodiments have been described above, the present invention is particularly effective when applied not only to the above embodiments but also to a wide range of image forming apparatuses such as electrophotographic recording apparatuses, such as page printers, facsimile machines, and copying machines.
［発明の効果］
以上述べたように本発明によれば、複数の磁極に着磁さ
れた円筒状の磁性体ローラーを有し、前記磁性体ローラ
ーにより発生する磁場により現像剤を前記磁性体ローラ
ー上に保持し、前記磁性体ローラーを回転させて前記現
像剤を搬送する現像装置において、前記現像剤搬送量規
制部材が弾性体であり、かつ前記磁性体ローラーに前記
現像剤搬送量規制部材が圧接しており、かつ前記磁性体
ローラーと前記現像剤搬送量規制部材の接触様式が面接
触であり１．かつ前記現像剤搬送量規制部材の端部が前
記磁性体ローラーに非接触である現像装置により、塑性
変形し易いあるいは自己凝集性の強い現像剤を用いる場
合に於いても、・簡単な構造で磁性体ローラー上に均一
な厚さの現像剤層を安定的に形成せしめ、高解像度で高
画質な画像を安定的に形成できる、という効果を有する
。[Effects of the Invention] As described above, the present invention includes a cylindrical magnetic roller magnetized with a plurality of magnetic poles, and uses a magnetic field generated by the magnetic roller to move the developer to the magnetic roller. In the developing device, the developer transport amount regulating member is an elastic body, and the developer transport amount regulating member is attached to the magnetic roller. 1. The magnetic roller and the developer transport amount regulating member are in pressure contact, and the contact pattern between the magnetic roller and the developer transport amount regulating member is surface contact.1. In addition, the developing device in which the end of the developer transport amount regulating member does not contact the magnetic roller allows a simple structure even when using a developer that is easily plastically deformed or has strong self-cohesive properties. This has the effect of stably forming a developer layer of uniform thickness on the magnetic roller, and stably forming a high-resolution, high-quality image.
第１図は本発明の実施例における現像装置を含む画像形
成装置の断面概観図。
潜像担持体
現像剤
磁性体ローラー
現像剤搬送量規制部材
電源
以
上FIG. 1 is a cross-sectional schematic diagram of an image forming apparatus including a developing device according to an embodiment of the present invention. Latent image carrier Developer Magnetic roller Developer transport amount regulating member Power supply or higher
Claims (2)
を有し、前記磁性体ローラーにより発生する磁場により
現像剤を前記磁性体ローラー上に保持し、前記磁性体ロ
ーラーを回転させて前記現像剤を搬送する現像装置にお
いて、前記磁性体ローラーに現像剤搬送量規制部材が圧
接していることを特徴とする現像装置。(1) A cylindrical magnetic roller magnetized with a plurality of magnetic poles is provided, the developer is held on the magnetic roller by a magnetic field generated by the magnetic roller, and the magnetic roller is rotated. A developing device for conveying the developer, wherein a developer conveyance amount regulating member is in pressure contact with the magnetic roller.
が面接触し、かつ前記現像剤搬送量規制部材の端部が前
記磁性体ローラーに非接触であることを特徴とする請求
項１記載の現像装置。(2) The magnetic roller and the developer transport amount regulating member are in surface contact with each other, and the end portion of the developer transport amount regulating member is not in contact with the magnetic roller. developing device.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17233489A JPH0336575A (en) | 1989-07-04 | 1989-07-04 | Developing device |
| PCT/JP1990/000808 WO1990016017A1 (en) | 1989-06-21 | 1990-06-20 | Developing apparatus |
| EP19900909488 EP0429684A1 (en) | 1989-06-21 | 1990-06-20 | Developing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17233489A JPH0336575A (en) | 1989-07-04 | 1989-07-04 | Developing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0336575A true JPH0336575A (en) | 1991-02-18 |
Family
ID=15939976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17233489A Pending JPH0336575A (en) | 1989-06-21 | 1989-07-04 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0336575A (en) |
-
1989
- 1989-07-04 JP JP17233489A patent/JPH0336575A/en active Pending
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