JPH03168782A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPH03168782A JPH03168782A JP31028189A JP31028189A JPH03168782A JP H03168782 A JPH03168782 A JP H03168782A JP 31028189 A JP31028189 A JP 31028189A JP 31028189 A JP31028189 A JP 31028189A JP H03168782 A JPH03168782 A JP H03168782A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- conveying member
- developer conveying
- 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
- 230000032258 transport Effects 0.000 claims description 15
- 230000002776 aggregation Effects 0.000 description 5
- 238000005054 agglomeration Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 239000004020 conductor Substances 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、静電的な潜像を現像剤により現像する現像装
置、特に磁気ブラシ現像装置に関する．［従来の技術］
従来の現像装置は、磁気ブラシ現像装置（一或分磁気ブ
ラシ及び二成分磁気ブラシ〉として公知のように回転自
在なステンレスやアルミニウムや黄銅に代表されるよう
な非磁性かつ導電性の円筒状の現像剤搬送部材（現像ス
リーブとも称す）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
する磁場にしたがって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
のであり、磁性体ローラーの着磁を螺旋状、あるいは格
子状に行った現像装置を本出願人が提案している．
［発明が解決しようとする課題］
しかし、前述の従来技術では、現像剤を現像剤搬送部材
により搬送するにつれ現像剤が現像剤搬送部材の一定方
向、たとえば軸端方向に溜ってしまうことがあり、従っ
て現像剤の利用効率を悪くし、また、現像剤の凝集の発
生により画質を低下させるおそれがあった．
そこで本発明はそのような問題点を解決するためのもの
で、その目的とするところは、現像剤の利用効率を高め
、また現像剤の凝集などを防止することにより高い画質
の得られる現像装置を提供するところにある．
［課題を解決するための手段コ
本発明の現像装置は、回転可能に保持された第一の現像
剤搬送部材の内部に複数の磁極に着磁された回転自在な
円筒状の磁性体ローラーを有し、磁性体ローラーにより
発生される磁場にしたがって現像剤搬送部材上の現像剤
を搬送し、磁性体ローラーが軸方向に複数の磁極を有す
る現像装置において、第一の現像剤搬送部材の軸方向に
現像剤を搬送する第二の現像剤搬送部材を第一の現像剤
搬送部材に隣接して配設することを特徴とする．［作用
］
本発明の上記の構成によれば、第一の現像剤搬送部材が
その軸方向にも現像剤搬送能力を有する際に、その逆方
向へ現像−剤を搬送する第二の現像剤搬送部材を配設す
ることにより現像剤が一定方向に溜ったり、凝集したり
することを防止することができる。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a developing device for developing an electrostatic latent image using a developer, and particularly to a magnetic brush developing device. [Prior Art] A conventional developing device uses rotatable non-magnetic and conductive material such as stainless steel, aluminum, or brass, known as a magnetic brush developing device (one-component magnetic brush or two-component magnetic brush). A cylindrical magnetic roller magnetized with a plurality of magnetic poles is provided inside a cylindrical developer transporting member (also referred to as a developing sleeve), and a magnetic roller is formed on the developer transporting member according to a magnetic field generated by the magnetic roller. The device holds the developer on the developer transport member and rotates at least one of the magnetic roller and the developer transport member to transport the developer on the developer transport member, and the magnetic roller is magnetized in a spiral or grid pattern. The present applicant has proposed a developing device that has been used in The developer may accumulate in a certain direction, for example, toward the end of the shaft, thereby reducing the efficiency of developer utilization and causing aggregation of the developer, which may reduce image quality. The objective is to provide a developing device that can obtain high image quality by increasing developer usage efficiency and preventing developer agglomeration. [Means for Solving the Problems] The developing device of the present invention includes a rotatably cylindrical magnetic roller magnetized with a plurality of magnetic poles inside a rotatably held first developer conveying member. In a developing device in which the developer on the developer transporting member is transported according to a magnetic field generated by a magnetic roller, and the magnetic roller has a plurality of magnetic poles in the axial direction, the first developer transporting member is The present invention is characterized in that the second developer conveying member that conveys the developer in the axial direction is disposed adjacent to the first developer conveying member. [Function] According to the above configuration of the present invention, When one developer transport member has the ability to transport developer also in its axial direction, by arranging a second developer transport member that transports the developer in the opposite direction, the developer is oriented in a fixed direction. It can prevent accumulation and agglomeration.
以下、実施例により本発明を詳細に説明する。Hereinafter, the present invention will be explained in detail with reference to Examples.
［実施例］
第１図は本発明の現像装置の実施例を説明するための概
略図である．回転自在なステンレスやアルミニウムや黄
銅に代表されるような非磁性かつ導電性の円筒状の第一
の現像剤搬送部材１（現像スリーブとも称す冫の内部に
螺旋状に複数の磁極に着磁された円筒状の磁性体ローラ
ー２を有し、磁性体ローラー２の発生する磁場にしたが
って第一の現像剤搬送部材１上に現像剤３を保持し磁性
体ローラー２と第一の現像剤搬送部材１のうち少なくと
も一方を回転させて第一の現像剤搬送部材１上の現像剤
３を搬送するものである。このとき磁性体ローラー２が
図中矢印Ｃの方向へ回転すると現像剤３は第一の現像剤
搬送部材１の軸端方向（図中矢印ａ方向）へも徐々に搬
送されていく．そこで、現像剤３を図中矢印ｂ方向へ搬
送することができる第二の現像剤搬送部材４を第一の現
像剤搬送部材１に隣接して配設することにより現像剤３
が第一の現像剤搬送部材ｌの軸端に溜ることを防ぐこと
ができる．本図では第二の現像剤搬送部材４として、軸
の周囲に帯状の部材を螺旋状に固定したスクリューを示
し、軸を図中矢印ｄの方向へ回転させることによりスク
リュ一部分が現像剤を図中矢印ｂ方向へ搬送するものと
したが、本発明はこれに限定されないことはいうまでも
ない．スクリューのサイズ、螺旋ピッチ、回転数は、矢
印ｂ方向へ搬送されていく現像剤３の皿により決定すれ
ばよいが、スクリューによる搬送量の方が多少少ない方
が望ましい．また、スクリューの材質は現像剤の流動性
などを考慮してアルミニウムのような非磁性材料を用い
ると良好であるが、もちろんこれに限定されるものでは
ない。このような構造をとることにより現像剤が一部分
に溜ることがないため現像剤の利用効率を向上させるこ
とができ、また、現像剤の凝集などを防ぐことができる
ため高い画質の得られる現像装置が実現できる．
第２図は本発明の現像装置の別の実施例を示す概略図で
あり、第一の現像剤搬送部材１により図中矢印ａの方向
へも徐々に現像剤が搬送されるとき、現像剤が溜りつつ
ある端部において第一の現像剤搬送部材１より現像剤を
回収し、図中矢印ｂの方向へ現像剤を流動させるべく傾
斜を施した第二の現像剤搬送部材５を配設している。第
一の現像剤搬送部材１から現像剤を回収する部分及び第
二の現像剤搬送部材にはブレード、ブラシ（磁気ブラシ
、ファーブラシ〉、ローラー（スポンジローラー）等、
種々のものが使用可能である．また、本発明の実施例と
して、第１図と第２１！１を組み合わせた構造をとるこ
とによりさらに良好な効果を得ることができる。[Example] FIG. 1 is a schematic diagram for explaining an example of the developing device of the present invention. A rotatable, non-magnetic and conductive cylindrical first developer conveying member 1 (also called a developing sleeve) typically made of stainless steel, aluminum, or brass is magnetized with a plurality of magnetic poles in a spiral shape. The magnetic roller 2 has a cylindrical magnetic roller 2 which holds the developer 3 on the first developer transporting member 1 according to the magnetic field generated by the magnetic roller 2. The developer 3 on the first developer conveying member 1 is conveyed by rotating at least one of them.At this time, when the magnetic roller 2 rotates in the direction of arrow C in the figure, the developer 3 is transferred to the first developer conveying member 1. The developer 3 is gradually conveyed in the axial end direction of the first developer conveying member 1 (in the direction of arrow a in the figure).Then, the second developer conveying member 3 is conveyed in the direction of arrow b in the figure. By arranging the member 4 adjacent to the first developer conveying member 1, the developer 3
can be prevented from accumulating on the shaft end of the first developer transporting member l. In this figure, a screw with a band-shaped member spirally fixed around the shaft is shown as the second developer conveying member 4. When the shaft is rotated in the direction of arrow d in the figure, a portion of the screw transports the developer in the direction shown in FIG. Although it is assumed that the conveyance is carried out in the direction of the middle arrow b, it goes without saying that the present invention is not limited thereto. The size, helical pitch, and number of revolutions of the screw may be determined by the tray of the developer 3 that is transported in the direction of arrow b, but it is desirable that the amount of transport by the screw be somewhat smaller. Further, it is preferable to use a non-magnetic material such as aluminum as the material of the screw in consideration of the fluidity of the developer, but the material is not limited thereto. With this structure, the developer does not accumulate in one area, which improves the efficiency of developer usage. It also prevents developer agglomeration, resulting in a developing device that provides high image quality. can be realized. FIG. 2 is a schematic diagram showing another embodiment of the developing device of the present invention. When the first developer conveying member 1 gradually conveys the developer in the direction of arrow a in the figure, the developer A second developer transport member 5 is provided which is inclined to collect the developer from the first developer transport member 1 and flow the developer in the direction of arrow b in the figure at the end where the developer is accumulating. are doing. Blades, brushes (magnetic brushes, fur brushes), rollers (sponge rollers), etc. are used in the part that collects the developer from the first developer transport member 1 and the second developer transport member.
Various types are available. Furthermore, as an embodiment of the present invention, even better effects can be obtained by adopting a structure that combines the structures shown in FIG. 1 and 21!1.
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、広く電子写真等の現像装置に応用することができ、
特にプリンターや複写機やファクシミリやディスプレー
に応用すれば有効である。Although the embodiments have been described above, the present invention can be applied not only to the above embodiments but also to a wide range of developing devices such as electrophotography.
It is especially effective when applied to printers, copiers, facsimile machines, and displays.
［発明の効果］
以上述べたように本発明によれば、現像剤が特定の位置
に溜ることを防ぎ、現像剤の利用効率を高め、また、現
像剤の凝集を防止することにより画質が向上するという
効果を有する。[Effects of the Invention] As described above, according to the present invention, image quality is improved by preventing developer from accumulating in specific positions, increasing developer usage efficiency, and preventing developer agglomeration. It has the effect of
第１図は本発明の現像装置の実施例を説明するための概
略図。
第２図は本発明の現像装置の別の実施例を示す概略図。
１ ： 第一の現像剤搬送部材
４．５： 第二の現像剤搬送部材
以
上FIG. 1 is a schematic diagram for explaining an embodiment of the developing device of the present invention. FIG. 2 is a schematic diagram showing another embodiment of the developing device of the present invention. 1: First developer conveying member 4.5: Second developer conveying member and above
Claims (1)
部に複数の磁極に着磁された回転自在な円筒状の磁性体
ローラーを有し、前記磁性体ローラーにより発生される
磁場にしたがって前記現像剤搬送部材上の現像剤を搬送
し、前記磁性体ローラーが軸方向に複数の磁極を有する
現像装置において、前記第一の現像剤搬送部材の軸方向
に現像剤を搬送する第二の現像剤搬送部材を前記第一の
現像剤搬送部材に隣接して配設することを特徴とする現
像装置。(1) A rotatably held cylindrical magnetic roller magnetized with a plurality of magnetic poles is provided inside the first developer conveying member, and the magnetic field generated by the magnetic roller is Therefore, in a developing device in which the developer on the developer transporting member is transported and the magnetic roller has a plurality of magnetic poles in the axial direction, the second developer transporting member transports the developer in the axial direction of the first developer transporting member. A developing device characterized in that a developer conveying member is disposed adjacent to the first developer conveying member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31028189A JPH03168782A (en) | 1989-11-29 | 1989-11-29 | Developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31028189A JPH03168782A (en) | 1989-11-29 | 1989-11-29 | Developing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03168782A true JPH03168782A (en) | 1991-07-22 |
Family
ID=18003347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31028189A Pending JPH03168782A (en) | 1989-11-29 | 1989-11-29 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03168782A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5359399A (en) * | 1993-08-12 | 1994-10-25 | Xerox Corporation | Hybrid scavengeless developer unit having a magnetic transport roller |
-
1989
- 1989-11-29 JP JP31028189A patent/JPH03168782A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5359399A (en) * | 1993-08-12 | 1994-10-25 | Xerox Corporation | Hybrid scavengeless developer unit having a magnetic transport roller |
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