JPS58137862A - Developing device of electronic photograph - Google Patents
Developing device of electronic photographInfo
- Publication number
- JPS58137862A JPS58137862A JP1931282A JP1931282A JPS58137862A JP S58137862 A JPS58137862 A JP S58137862A JP 1931282 A JP1931282 A JP 1931282A JP 1931282 A JP1931282 A JP 1931282A JP S58137862 A JPS58137862 A JP S58137862A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- developing
- roller
- magnetic field
- roll
- 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
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
- G03G15/0808—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by the developer supplying means, e.g. structure of developer supply roller
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
従来、電子写真装置において、第１図に示す如く回転マ
グネット現像ローラー２上に厚み規正部材４によシ薄層
に磁性現像剤をコートし、感光体ｌに接触或い拡近接さ
せて現像する現像装置においては、現像ローラーの汚染
による重布ムラや画質の悪化を防止するために、図中の
スクレーツタ−１β茹き清掃手段が不可欠となっている
。DETAILED DESCRIPTION OF THE INVENTION Conventionally, in an electrophotographic apparatus, as shown in FIG. In a developing device that performs development by enlarging the developing roller, the Scrater 1β boiling cleaning means shown in the figure is indispensable in order to prevent unevenness and deterioration of image quality due to contamination of the developing roller.
すなわち、現像ローラー表面に現像剤中に含まれるトナ
ーの微粉やトナーから分離した磁性体、さらにはトナー
中の添加剤等が付着し、現像剤に摩擦帯電電荷を与える
に有効な現像ロー２−表面を覆う等の事態が生ずるので
、これらの異物除去の目的で現像ローラーにＦｉｌｅ樹
脂、リン青銅、！１１０８等の薄板ででｉＩたスクレー
パーを現像ローラーに当接させなければならない。That is, toner fine powder contained in the developer, magnetic material separated from the toner, additives in the toner, etc. adhere to the surface of the developing roller, and the developing roller 2- is effective in imparting a triboelectric charge to the developer. To remove these foreign substances, the developing roller should be coated with File resin, phosphor bronze,! A scraper made of a thin plate such as 1108 must be brought into contact with the developing roller.
しかしこのスクレー・譬−の如き清掃手段が常時現像ロ
ーラーに当接すると、当接部で発生する熱や圧力で現像
剤の融着や凝集が起こり上記清掃手段による効果が得ら
れない事や、現像ローラーと清掃手段との！Ｉ接によル
現儂ローラーに傷が入ったシ清掃手段が摩耗する事など
の欠点が生ずる場合がある。However, if a cleaning means such as a scraper is constantly in contact with the developing roller, the heat and pressure generated at the contact portion will cause the developer to fuse or aggregate, making the cleaning means ineffective. The developing roller and cleaning means! There may be disadvantages such as damage to the existing roller due to I-contact and wear of the cleaning means.
本発明は上記欠点を改嵐すべくこの現像ローラー上の現
像時に悪影＊ｔ−及はす如上の付着物を、当接部を用い
ずに除去するようにし九現偉装置を提供するものである
。In order to overcome the above-mentioned drawbacks, the present invention provides a development device that removes bad images and deposits on the developing roller during development without using a contact portion. It is.
本発明のｌ！［装置は、薄層の現像剤を担持する現像ロ
ーラーとなる第１の磁界発生ローラーと、該ローラーに
現像剤を塗布供給する供給ローラーとなる第２の磁界発
生ローラーとからなる、磁性現像剤を用いる電子写真の
現像装置であって、現俸時以外の時間には上記両ローラ
ー間の塗布部に反発磁界を生せしめて第１のローラー上
の現像剤を第２の四−ツーに転移させて第１のローラー
の面を清掃するように構成し九ことを特徴とするもので
ある。l of the present invention! [The device includes a first magnetic field generating roller that serves as a developing roller that carries a thin layer of developer, and a second magnetic field generating roller that serves as a supply roller that coats and supplies the developer to the magnetic developer. This is an electrophotographic developing device using an electrophotographic developing device, in which a repulsive magnetic field is generated in the application area between the two rollers at times other than the current feeding time, and the developer on the first roller is transferred to the second four-two. The present invention is characterized in that it is configured to clean the surface of the first roller by cleaning the surface of the first roller.
以下図に従って本発明の実施例につき説明する。Embodiments of the present invention will be described below with reference to the drawings.
第２図に於いて、内部にマグネットを設けた供給ローラ
ー３に保持された現像剤７は、厚み規制部材４により塗
布に最適な厚みを持った現像剤のブラシとなる。供給ロ
ーラー上の現像剤のｆ２シが現像ローラー２を塗布部５
において摺擦することで現像ローラー２上には薄層に現
像剤が塗布される。In FIG. 2, the developer 7 held by the supply roller 3 having a magnet inside becomes a developer brush having an optimal thickness for application by the thickness regulating member 4. The developer f2 on the supply roller transfers the developing roller 2 to the coating section 5.
The developer is applied in a thin layer onto the developing roller 2 by rubbing at.
現像ローラー上の現像剤は感光ドラムｌの潜像電位に応
じて、ドラム１に近接して非接触あるいは接触して現像
される。現像されずに現像ロート上に残留した現像剤８
は現像動作中は現像ローラーに付着したまま塗布部５に
入シ再び均一に塗布される。The developer on the developing roller is developed in close proximity to the drum 1, either in a non-contact manner or in contact, depending on the potential of the latent image on the photosensitive drum 1. Developer 8 remaining on the developing funnel without being developed
During the developing operation, the toner enters the coating section 5 while remaining adhered to the developing roller and is uniformly coated again.
この現像剤の帯電電荷は塗布部５で現像ローラー２を摺
擦する時に与えられる摩擦帯電電荷である。この丸め、
現像ローラー表面に現像に寄与するもの以外の物が付着
すると現像剤に電荷を与える事ができないために現像ム
ラを生じてしまう。The electrical charge of this developer is a triboelectric charge given when the developing roller 2 is rubbed in the coating section 5. This rounding,
If substances other than those contributing to development adhere to the surface of the developing roller, it will not be possible to impart a charge to the developer, resulting in uneven development.
これを防止する為に現像ローラー表面をクリーニングす
ることが必要となるが前述の如きスクレーバーのような
当接部材でクリーニングする事は好ましくないことは前
述のとおりである。そこで本発明では、現俸時以外の時
間、例えば電子写真装置における光学系パック時或いは
感光ドラム後回転時に塗布部５に反発磁界を作夛現像ロ
ーラー２上の現像剤を供給ローラー３に転移させると同
時に塗布されない状態を作るようにするのである。In order to prevent this, it is necessary to clean the surface of the developing roller, but as mentioned above, it is not preferable to clean it with a contact member such as the above-mentioned scraper. Therefore, in the present invention, a repulsive magnetic field is applied to the application section 5 at times other than during development, such as when packing the optical system in an electrophotographic apparatus or during post-rotation of the photosensitive drum, to transfer the developer on the developing roller 2 to the supply roller 3. At the same time, a condition is created in which no coating is applied.
＋４１
以下、この点につき詳細に説明する。供給ローラー３は
その外周の中空円筒状スリーブが矢印方向に回転するが
、その内側にあるマグネットは固定されている。現像ロ
ーラー２は矢印方向に回転する中空円筒状スリーブであ
って、第２図の実施例では、その内部に塗布部５の位置
に静止している電磁石６が設置されている。同図中、１
２は塗布部５の部位Ｃにおける電磁石６の磁極の極性を
変えるためのスイッチでありて、ａ側に閉じたときには
、上記極性は供給ローラー３のマグネットの塗布部５に
おける磁極とは異極となシ現儂剤は供給ローラー３から
現像ローラー２に塗布される。+41 This point will be explained in detail below. The hollow cylindrical sleeve on the outer periphery of the supply roller 3 rotates in the direction of the arrow, but the magnet inside it is fixed. The developing roller 2 is a hollow cylindrical sleeve that rotates in the direction of the arrow, and in the embodiment shown in FIG. 2, an electromagnet 6 that is stationary at the position of the application section 5 is installed inside the sleeve. In the same figure, 1
2 is a switch for changing the polarity of the magnetic pole of the electromagnet 6 in the portion C of the application section 5, and when it is closed to the side a, the above polarity is different from the magnetic pole of the magnet of the supply roller 3 in the application section 5. The developer is applied to the developing roller 2 from the supply roller 3.
しかしスイッチ１２がｂ側に閉じえときには、上記極性
は同極となりて塗布部５において両ローラー間に反発磁
界を作シ、現像ローラー２上の現像剤が供給ローラー３
に転移する（これによシ現儂ローラー２０表面は清掃さ
れることになる）と共に、上記の反発磁界によシ供給ロ
ーラー３上の現像剤ブラシの塗布部５における先端部で
社現儂ローラー２へ向かう現像剤の横立ちに寄与する磁
力が現像ローラーからの反発磁力に妨げられ、骸ブラシ
の先端部は供給ローラー側へ押されるように、よるので
、この両ローラーの磁力の向きの相反のために上記現儂
剤ゾラシの先端と現像ローラーとの間に空隙が生じて現
像剤は現像ローラー２に接する事がなくなシ、供給ロー
ラー３から現像ローラー２への現像剤の塗布は行われな
くなる。なお上記スイッチ１２をａ偶に閉じたときには
電磁石６が無励磁となるようにしても機能上さしつかえ
ない。However, when the switch 12 is closed to the b side, the polarities become the same, creating a repulsive magnetic field between both rollers in the application section 5, and the developer on the developing roller 2 is transferred to the supply roller 3.
(Thus, the surface of the developer roller 20 is cleaned), and at the same time, due to the above-mentioned repulsive magnetic field, the developer brush on the supply roller 3 is transferred to the developer roller 3 at the tip of the application section 5. The magnetic force that contributes to the sideways movement of the developer toward 2 is obstructed by the repulsive magnetic force from the developing roller, and the tip of the skeleton brush is pushed toward the supply roller, so the directions of the magnetic forces of both rollers are contradictory. Therefore, a gap is created between the tip of the developer roller and the developing roller, and the developer does not come into contact with the developing roller 2, and the application of the developer from the supply roller 3 to the developing roller 2 is stopped. I won't be able to do it. Note that it is functionally acceptable even if the electromagnet 6 is not energized when the switch 12 is closed.
ｔた反発磁界を作る手段としては、第２図のほかに、第
３図のように、現像ローラー２の内部に第２図の電磁石
６０代シに磁石９を設定し、これを矢印の如く回動させ
てその磁極配置を変えることによ）、塗布部５において
供給ローラー３の磁極に対して異極又は同極ならしめて
そこに吸引磁界を九は反発磁界を選択的に作シ出すよう
にしてもよく、或は第４図のように現像ローラー２内の
磁石は固定し、供給ローラー３内の磁石を矢印の如く回
動させてその磁極配置管変えることにより塗布部５に吸
引または反発磁界を選択的に作や出すようにしてもよい
０反発磁界による現像剤の挙動は第２図で述べたのと同
様である。In addition to the method shown in FIG. 2, as a means of creating a repulsive magnetic field, as shown in FIG. By rotating the magnetic poles (by rotating the magnetic poles to change the magnetic pole arrangement), the magnetic poles of the supply roller 3 are made to have different polarities or the same polarity as the magnetic poles of the supply roller 3 in the application section 5, thereby selectively creating an attractive magnetic field and a repelling magnetic field there. Alternatively, as shown in FIG. 4, the magnet in the developing roller 2 may be fixed, and the magnet in the supply roller 3 may be rotated as shown by the arrow to change its magnetic pole arrangement, thereby attracting or The behavior of the developer with a zero repulsive magnetic field, in which a repulsive magnetic field may be selectively created or generated, is similar to that described in FIG.
上記から理解されるように、現１１ｏ−２−２の回転に
伴い、上記の反発磁界が作られていない間は現像ローラ
ー２の表面に現像剤の連続塗布層が生じ、反発磁界が作
られている間はそれは生じない。この塗布層の始端と終
端は上記反発磁界を作シ出した夛消滅させたシするタイ
ミングで定まる。As can be understood from the above, as the developer 11o-2-2 rotates, a continuous coating layer of developer is generated on the surface of the developing roller 2, and a repulsive magnetic field is created while the above-mentioned repulsive magnetic field is not created. It won't happen while you are there. The starting and ending ends of this coating layer are determined by the timing at which the repulsive magnetic field is generated and then extinguished.
そして本発明では、このタイミングは、第２図中、部位
Ａで感光ドラム１上に形成された潜像の始端が感光ドラ
ムの矢印方向の回転によシ部位Ｂ（現像部位）に達する
時点又はそれよシ若干早い時点に上記塗布層の始端が現
像ローラー２の矢印方向の回転によ〕部位Ｂ’（Ｂに対
向する部位）に達するように、ｔた、上記潜像の終端が
部位Ｂに達する時点又はそれよシ若干遅い時点に上記塗
布層の終端が部位Ｂ′に達するように、定める。つｔ、
ｔ＋、感光ドラム上の潜像が部位Ｂ１通過している時間
中だけ現像ロール上の現像剤の層が部位Ｂ′に存在する
ように、上述の反発磁界を作プ出す前記手段の動作タイ
ミングを電子写真装置の原稿走査又は感光ドラムの回転
合わせるのである。反発磁界を作っている期間には前述
のように現像ローラー表面の清掃が行われる訳である。In the present invention, this timing is defined as the point in time when the starting edge of the latent image formed on the photosensitive drum 1 at the position A in FIG. Then, at a slightly earlier point in time, the starting end of the coating layer is rotated in the direction of the arrow in the developing roller 2 so that it reaches the area B' (the area opposite to B), and the end of the latent image is moved to the area B'. The end of the coating layer is set so that it reaches portion B' at the point when the point B' is reached or a little later than that point. Tsut,
t+, the operation timing of the means for creating the above-mentioned repulsive magnetic field is adjusted so that the layer of developer on the developing roll is present in the region B' only during the time when the latent image on the photosensitive drum is passing through the region B1. This synchronizes the scanning of an electrophotographic device or the rotation of a photosensitive drum. During the period when the repulsive magnetic field is being generated, the surface of the developing roller is cleaned as described above.
以上に示したように、本発明によれば、現像ローツーと
供給ローラーとを備え、現像が行われていない時間の間
、両ローラー間の塗布部に反発磁界を生ぜしめて現像ロ
ーラー上の現像剤を供給ローラーに転移させて現像ロー
ラーの面をクリーニングするので、従来のスクレー・ぐ
−の如き当接手段で現像ローラーの藺を清掃つまりクリ
ーニングする場合に見られる完配の如き従来の欠点を除
くことができる。As described above, according to the present invention, a developing roller and a supply roller are provided, and during the time when development is not performed, a repulsive magnetic field is generated in the application area between both rollers, and the developer on the developing roller is Since the surface of the developing roller is cleaned by transferring it to the supply roller, it eliminates the conventional disadvantages such as incomplete distribution that is seen when cleaning the developing roller with conventional contact means such as a scraper or gun. be able to.
第１図は従来の現像装置の１例を示す断面図、第２図な
いし第４図は本発明の幾つかの実施例の要部を夫々示す
断面図である。
図中、
ｌ・・・感光ドラム、 ２・・・現像ローラー、
３・・・供給ロー２−１ ４・・・規制部材、５・・
・塗布部、 ６・・・電磁石、７．８・・・
現像剤、 ９・・・磁石、１１・・・スクレー”
−１１２・・・スイッチ。
ｖ：、４図FIG. 1 is a sectional view showing one example of a conventional developing device, and FIGS. 2 to 4 are sectional views showing essential parts of several embodiments of the present invention. In the figure, l...photosensitive drum, 2... developing roller,
3... Supply row 2-1 4... Regulating member, 5...
・Application part, 6... Electromagnet, 7.8...
Developer, 9...Magnet, 11...Scray"
-112...Switch. v:, Figure 4
Claims (1)
発生ローラーと、該ロー２−に現像剤を塗布供給する供
給ローラーとなる第２の磁界発生ローラーとからなる電
子写真の現像装置であって、現俸時以外の時間には上記
両ローラー間の塗布部に反発磁界を生せしめて第１のロ
ーラー上の現像剤を第２のローラーに転移させて第１の
ローラーの面を清掃することを特徴とする現像装置。An electrophotographic developing device comprising a first magnetic field generating roller that serves as a developing row 2 that carries a thin layer of developer, and a second magnetic field generating roller that serves as a supply roller that applies and supplies the developer to the row 2. Then, at times other than the current feeding time, a repulsive magnetic field is generated in the application area between the two rollers to transfer the developer on the first roller to the second roller and clean the surface of the first roller. A developing device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1931282A JPS58137862A (en) | 1982-02-09 | 1982-02-09 | Developing device of electronic photograph |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1931282A JPS58137862A (en) | 1982-02-09 | 1982-02-09 | Developing device of electronic photograph |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58137862A true JPS58137862A (en) | 1983-08-16 |
Family
ID=11995891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1931282A Pending JPS58137862A (en) | 1982-02-09 | 1982-02-09 | Developing device of electronic photograph |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58137862A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5341197A (en) * | 1992-12-07 | 1994-08-23 | Xerox Corporation | Proper charging of donor roll in hybrid development |
-
1982
- 1982-02-09 JP JP1931282A patent/JPS58137862A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5341197A (en) * | 1992-12-07 | 1994-08-23 | Xerox Corporation | Proper charging of donor roll in hybrid development |
| US5420375A (en) * | 1992-12-07 | 1995-05-30 | Xerox Corporation | Proper charging of donor roll in hybrid development |
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