JPS61138972A - Device for developing electrostatic latent image - Google Patents

Device for developing electrostatic latent image

Info

Publication number
JPS61138972A
JPS61138972A JP26215084A JP26215084A JPS61138972A JP S61138972 A JPS61138972 A JP S61138972A JP 26215084 A JP26215084 A JP 26215084A JP 26215084 A JP26215084 A JP 26215084A JP S61138972 A JPS61138972 A JP S61138972A
Authority
JP
Japan
Prior art keywords
developer
sleeve
latent image
electrostatic latent
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
Application number
JP26215084A
Other languages
Japanese (ja)
Inventor
Mitsuo Mochizuki
望月　光雄
Yasuo Inui
乾　泰夫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic System Solutions Japan Co Ltd
Original Assignee
Matsushita Graphic Communication Systems Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Graphic Communication Systems Inc filed Critical Matsushita Graphic Communication Systems Inc
Priority to JP26215084A priority Critical patent/JPS61138972A/en
Publication of JPS61138972A publication Critical patent/JPS61138972A/en
Pending legal-status Critical Current

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
    • G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Brush Developing In Electrophotography (AREA)

Abstract

PURPOSE:To make possible the easy scraping of a two-component developer from a sleeve by providing a developer scraping plate having a ferromagnetic material in sliding contact with the sleeve on the side nearer the progression side of the developer than the developing region on the sleeve corresponding to an electrostatic latent image. CONSTITUTION:The developer 27 on the sleeve 22 is made uniform in the layer thickness by a control blade 21 and arrives at a developing region 33. The toner incorporated into the developer 27 sticks to the electrostatic latent image 34 in the region 33 by which the development is executed. The developer 27 on the sleeve 22 is thereafter stripped from the sleeve 22 by the developer scraping plate 24. Since the plate 24 is constituted of the ferromagnetic material, the magnetic lines of force 25 by a magnet 23 are magnetically shielded by the plate 24 and the influence of the magnetic lines of force 25 is not exerted to the developer 27a stripped from the sleeve 22. The developer falls easily to the bottom of a developing device 32 by the dropping force generated by the moving speed and gravity.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は２成分現像剤を用いる静電潜像現像装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electrostatic latent image developing device using a two-component developer.

従来の技術 従来の静電潜像現像装置の一例を第３図に示す・この静
電潜像現像装置は、トナーとキャリアより成る２成分現
像剤７を保持し、回転により現像剤７を移動する円筒状
のスリーブ２と、このスリーブ２の内部に同心円状に配
置し、スリーブ２上に現像剤７を吸引し、スリーブ２に
対応して回転するマグネット３と、感光体ドラムなどに
形成された静電潜像１４に対応した位置のスリーブ２上
の現像領域１１よυ現像剤７の進行側に、スリーブ２と
摺接して設けた現像剤かき落とし板４などから構成され
ている。2. Related Art An example of a conventional electrostatic latent image developing device is shown in FIG. 3. This electrostatic latent image developing device holds a two-component developer 7 consisting of toner and carrier, and moves the developer 7 by rotation. a cylindrical sleeve 2, a magnet 3 that is arranged concentrically inside the sleeve 2, attracts the developer 7 onto the sleeve 2, and rotates in response to the sleeve 2; The development area 11 on the sleeve 2 at a position corresponding to the electrostatic latent image 14 is comprised of a developer scraping plate 4 and the like provided in sliding contact with the sleeve 2 on the advancing side of the developer 7.

撹拌用羽根車６によって撹拌された現像剤７は、スリー
ブ２に供給され、スリーブ２とマグネット３の回転によ
り矢印８の方向へ搬送される。現像剤７は、規制ブレー
ド１で層の厚さの均一化が行われた上で現像領域１１に
達し、現像剤７に含有されたトナーが、静電潜像１４に
付着し、現像が行われる。スリーブ２上に残った現像剤
７は現像剤かき落とし板４によ１て現像器１２の底部に
かき落とされ、搬送用羽根車５の矢印９方向の回転によ
って撹拌用羽根車６に戻され、トナー濃度の均一化を計
る。同時に、トナーはキャリアとの摩擦帯電で電荷が与
えられる、 ところで、静電潜像１４の現像の質を高くするために、
現像領域１１において現像剤７のトナーａ度を精度高く
保つ必要がある。一方、現像部１１でトナー現像に消費
されるため、現像部１１直後の現像剤７のトナー濃度は
低下している。このことより、現像領域１１で使用する
現像剤７のトナー濃度を所定値に回復するため、現像剤
かき落とし板４で現像領域１１を通過した現像剤７をス
リーブ２上から回収し現像器１２内に残っている他の現
像剤７と混合・撹拌する。このようにして現像領域１１
におけるトナー濃度を所定値に保つようにしている。The developer 7 stirred by the stirring impeller 6 is supplied to the sleeve 2, and is conveyed in the direction of arrow 8 by rotation of the sleeve 2 and magnet 3. The developer 7 reaches the development area 11 after its layer thickness is made uniform by the regulating blade 1. The toner contained in the developer 7 adheres to the electrostatic latent image 14, and development is performed. be exposed. The developer 7 remaining on the sleeve 2 is scraped off to the bottom of the developing device 12 by the developer scraping plate 4, and returned to the stirring impeller 6 by rotation of the conveying impeller 5 in the direction of arrow 9. Measure the uniformity of toner density. At the same time, the toner is charged by frictional charging with the carrier.In order to improve the quality of development of the electrostatic latent image 14,
It is necessary to maintain the toner degree of the developer 7 with high accuracy in the development area 11. On the other hand, since the toner is consumed for toner development in the developing section 11, the toner concentration of the developer 7 immediately after the developing section 11 is decreasing. Therefore, in order to restore the toner concentration of the developer 7 used in the developing area 11 to a predetermined value, the developer 7 that has passed through the developing area 11 is collected from above the sleeve 2 by the developer scraping plate 4 and placed inside the developing device 12. Mix and stir with the remaining developer 7. In this way, the development area 11
The toner concentration in the image is maintained at a predetermined value.

発明が解決しようとする問題点 しかしながら、上述した静電潜像装置によると、現像剤
かき落とし板４はポリエステルプラスチックなどの非磁
性体で形成されておシ、尚核部において、現像剤７は、
例えば流動性の変化によって移動速度と自重などによる
落下刃とマグネット３との引力とのバランスが違ってく
ると現像剤かき落とし板４付近に帯留してしまｂ１後続
の現像剤７のかき落としができなくなってしまう。Problems to be Solved by the Invention However, according to the electrostatic latent image device described above, the developer scraping plate 4 is made of a non-magnetic material such as polyester plastic, and the developer 7 in the core portion is
For example, if the balance between the moving speed and the attractive force between the falling blade and the magnet 3 due to its own weight changes due to a change in fluidity, the developer will become stuck near the scraping plate 4, making it impossible to scrape off the developer 7 that follows b1. I end up.

この問題に対し、マグネット３の磁力、現像剤７の移動
速度の調整あるいは適正な力学的・磁気的特性を有した
現像剤７の選択などによってマグネット３の引力に打勝
ち、現像剤７をかき落とすことが考えられる。しかし、
マグネット３の磁力の調整あるいは現像剤７の移動速度
の調整を行うと、現像特性も変化してしまう。又、適正
な力学的・磁気的特性を有した現像剤７を用いて対処す
ることによっても同様に現像特性の変化を引き起こす。To solve this problem, the attractive force of the magnet 3 can be overcome by adjusting the magnetic force of the magnet 3, the moving speed of the developer 7, or the selection of a developer 7 with appropriate mechanical and magnetic properties. It is possible to drop it. but,
If the magnetic force of the magnet 3 or the moving speed of the developer 7 is adjusted, the development characteristics will also change. Further, by using a developer 7 having appropriate mechanical and magnetic properties, changes in the development properties are also caused.

また、現像剤かき落とし板の形状や位置を工夫すること
も考えられるが、落下刃の増大は望めず、マグネット３
の磁力による滞留は同様に生じてしまい根本的な解決策
にはならない。It is also possible to devise the shape and position of the developer scraping plate, but it is not possible to increase the number of falling blades, and the magnet 3
Retention due to magnetic force also occurs and is not a fundamental solution.

本発明は、上記問題を解消するために成されたもので、
２成分現像剤の特性を変えることなく、２成分現像剤を
スリーブから容易にかき落としを行なうことができる静
電潜像現像装置を提供することを目的とする。The present invention was made to solve the above problems, and
It is an object of the present invention to provide an electrostatic latent image developing device that can easily scrape off a two-component developer from a sleeve without changing the characteristics of the two-component developer.

問題点を解決するための手段 本発明は、２成分現像剤を付着し、回転により２成分現
像剤を移動する円筒状のスリーブと、このスリーブ上に
２成分現像剤を吸引し、スリーブに対応して回転するマ
グネットと、スリーブを内蔵し、２成分現像剤を収納す
る現像器と、現像器に内蔵し、２成分現像剤に対する撹
拌部材とよりなる静電潜像現像装置にあって、静電潜像
に対応したスリーブ上の現像領域より２成分現像剤の進
行側に、スリーブと摺接して強磁性材料体を有した現像
剤かき落とし板を設けたものである。Means for Solving the Problems The present invention includes a cylindrical sleeve to which a two-component developer is attached and moves the two-component developer by rotation, and a sleeve that sucks the two-component developer onto the sleeve and corresponds to the sleeve. An electrostatic latent image developing device includes a magnet that rotates, a developing device that has a built-in sleeve and stores a two-component developer, and a stirring member that is built into the developing device and that stirs the two-component developer. A developer scraping plate having a ferromagnetic material and in sliding contact with the sleeve is provided on the advancing side of the two-component developer from the development area on the sleeve corresponding to the electro-latent image.

作　　用 この技術的手段による作用は次のとおシである。For production The effect of this technical means is as follows.

トナーとキャリアより成る２成分現像剤はマグネットヲ
内部に設けた円筒状のスリーブによって現像領域に搬送
される。そして、現像領域で静電潜像に付着しなかった
２成分現像剤は、スリーブと摺接して設けられた現像剤
かき落とし板によってスリーブからひき離される。この
際、現像剤かき落とし板が少なくとも強磁性材料体を有
しているため、マグネットによる磁力は現像剤かき落と
し板によって遮蔽され、スリーブからひき離された現像
剤にはマグネットによる磁力が及ばない。そのため、確
実にかき落としが行なわれる。A two-component developer consisting of toner and carrier is conveyed to a developing area by a cylindrical sleeve provided inside the magnet. The two-component developer that has not adhered to the electrostatic latent image in the development area is separated from the sleeve by a developer scraping plate provided in sliding contact with the sleeve. At this time, since the developer scraping plate includes at least a ferromagnetic material, the magnetic force of the magnet is blocked by the developer scraping plate, and the magnetic force of the magnet does not reach the developer separated from the sleeve. Therefore, scraping is performed reliably.

実施例 第１図、第２図を用いて本発明の一実施例による静電潜
像現像装置について説明する。第１図は本発明の一実施
例による静電潜像現像装置の構成図、第２図は第１図に
示す静電潜像現像装置の原理図である。この静電潜像現
像装置は、トナーとキャリアより成る２成分現像剤２７
を保持し、回転により現像剤２７を移動する円筒状のス
リーブ２２と、このスリーブ２２の内部に同心円状に配
置し、スリーブ２２上に現像剤２７を吸引し、スリーブ
２２に対応して回転するマグネット２３と、スリーブ２
２を内蔵し、現像剤２７′ｔ−収納する現像器３２と、
現像器３２１Ｃ内蔵し現像剤２７に対する撹拌部材であ
る撹拌用羽根車２６．感光体ドラムなどに形成された静
電潜像３４に対応したスリーブ２２上の現像領域３３よ
り現像剤２７の進行側にスリーブ２２と摺接して強磁性
材料体を有した現像剤かき落とし板２４等により構成さ
れている。Embodiment An electrostatic latent image developing device according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 is a block diagram of an electrostatic latent image developing device according to an embodiment of the present invention, and FIG. 2 is a diagram showing the principle of the electrostatic latent image developing device shown in FIG. This electrostatic latent image developing device uses a two-component developer 27 consisting of toner and carrier.
A cylindrical sleeve 22 that holds and moves the developer 27 by rotation, and a cylindrical sleeve 22 that is arranged concentrically inside this sleeve 22, sucks the developer 27 onto the sleeve 22, and rotates in response to the sleeve 22. Magnet 23 and sleeve 2
a developing device 32 containing a developer 27' and a developer 27';
A stirring impeller 26, which is a stirring member for the developer 27, is built in the developing device 321C. A developer scraping plate 24 having a ferromagnetic material in sliding contact with the sleeve 22 on the advancing side of the developer 27 from the development area 33 on the sleeve 22 corresponding to the electrostatic latent image 34 formed on a photoreceptor drum or the like. It is made up of.

次にこの静電潜像現像装置の動作について説明する。２
成分現像剤２７は、撹拌用羽根車２６の矢印３ｏ方向の
回転によってスリーブ２２上に移動する。スリーブ２２
上の現像剤２７は、マグネット２３とスリーブ２２の回
転により矢印２８方向へ搬送され、規制ブレード２１に
より現像剤２７の層が均一化された上で現像領域３３に
達する。Next, the operation of this electrostatic latent image developing device will be explained. 2
The component developer 27 is moved onto the sleeve 22 by rotation of the stirring impeller 26 in the direction of the arrow 3o. Sleeve 22
The upper developer 27 is conveyed in the direction of arrow 28 by the rotation of the magnet 23 and sleeve 22, and reaches the development area 33 after the layer of developer 27 is made uniform by the regulation blade 21.

現像剤２７に含有されたトナーが現像領域３３において
静電潜像３４に付着し、現像が行われる。The toner contained in the developer 27 adheres to the electrostatic latent image 34 in the development area 33, and development is performed.

スリーブ２２上の現像剤２７は現像剤かき落とし板２４
によってスリーブ２２からひき離される。The developer 27 on the sleeve 22 is removed by the developer scraping plate 24.
It is pulled away from the sleeve 22 by.

現像剤かき落とし板２４が強磁性材料で構成されている
ため、マグネット２３による磁力線２５は現像剤かき落
とし板２４で磁気遮蔽され、スリーブ２２からひき離き
れた現像剤２７ａには磁力線２５の影響が及ばず、移動
速度及び自重などによる落下刃により、容易に現像器３
２の底部に落下する。現像器３２の底部に達したひき離
された現像剤２７ａは、搬送用羽根車３５の矢印３９の
方向の回転により撹拌用羽根車２６に達し、撹拌される
。この撹拌により、トナーにはキャリアとの摩擦帯電で
電荷が与えられると共に、トナー濃度が所定値に回復さ
れる。この後、現像剤２７は再びスリーブ２２に搬送さ
れる。Since the developer scraping plate 24 is made of a ferromagnetic material, the magnetic lines of force 25 caused by the magnet 23 are magnetically shielded by the developer scraping plate 24, and the developer 27a separated from the sleeve 22 is not affected by the magnetic lines of force 25. However, due to the falling blade due to the moving speed and its own weight, it is easy to remove the developing device 3.
Fall to the bottom of 2. The separated developer 27a that has reached the bottom of the developing device 32 reaches the stirring impeller 26 by rotation of the conveying impeller 35 in the direction of the arrow 39, and is stirred. By this stirring, the toner is charged by friction with the carrier, and the toner concentration is restored to a predetermined value. After this, the developer 27 is conveyed to the sleeve 22 again.

なお、本実施例では、現像剤かき落とし板２４は全体が
強磁性材料体で構成された場合について説明したが、例
えばスリーブ２２との接触を考慮して、スリーブ２２と
摺接する側を非磁性材料体とし、反対側を強磁性材料体
として構成した現像剤かき落とし板としても、同様の効
果を得ることができる。In this embodiment, the case where the developer scraping plate 24 is entirely made of a ferromagnetic material has been described, but for example, in consideration of contact with the sleeve 22, the side that makes sliding contact with the sleeve 22 is made of a non-magnetic material. A similar effect can be obtained by using a developer scraping plate configured as a body and the opposite side as a ferromagnetic material body.

発明の効果 本発明によれば、少なくとも強磁性材料体を有する現像
剤かき落とし板を設けてあシ、マグネットの磁力を磁気
遮蔽するため、スリーブから現像剤を容易にしかも確実
にかき落とすことができるという効果がある。Effects of the Invention According to the present invention, since the developer scraping plate having at least a ferromagnetic material is provided to magnetically shield the magnetic force of the magnet, the developer can be scraped off easily and reliably from the sleeve. There is an effect.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の一実施例による静電潜像装置の構成図
、第２図は第１図に示す静電潜像現像装置の原理図、第
３図は従来の静電潜像現像装置の構成図である。 ２２・・・・・・スリーブ、ｉ３・・・・・・マグネッ
ト、２４・・・・・・現像剤かき落とし板（少なくとも
強磁性材料体を有する現像剤かき落とし板）、２６・・
・・・・撹拌用羽根車（撹拌用部材）、２７・・・・・
・現像剤、２７ａ・・・・・・スリーブからひき離され
た現像剤、３２・・・・・・現像器。 代理人の氏名　弁理士　中　尾　敏　男　ほか１名２！
−−−スリーブ ！３−−−７７°本ハFIG. 1 is a block diagram of an electrostatic latent image device according to an embodiment of the present invention, FIG. 2 is a principle diagram of the electrostatic latent image developing device shown in FIG. 1, and FIG. 3 is a conventional electrostatic latent image developing device. It is a block diagram of a device. 22...Sleeve, i3...Magnet, 24...Developer scraping plate (developer scraping plate having at least a ferromagnetic material), 26...
... Stirring impeller (stirring member), 27...
- Developer, 27a...Developer separated from the sleeve, 32...Developer. Name of agent: Patent attorney Toshio Nakao and 1 other person 2!
--- Sleeve! 3---77° Main C

Claims (1)

【特許請求の範囲】[Claims] ２成分現像剤を付着し、回転によりこの現像剤を移動す
る円筒状のスリーブと、このスリーブの内部に同心円状
に配置し、上記スリーブ上に上記現像剤を吸引保持し、
上記スリーブに対応して回転するマグネットと、上記ス
リーブを内蔵し、上記現像剤を収納する現像器と、この
現像器に内蔵し、上記現像剤に対する撹拌部材とよりな
る静電潜像現像装置にあって、静電潜像に対応したスリ
ーブ上の現像領域より上記現像剤の進行側で、上記スリ
ーブと摺接して強磁性材料体を有する現像剤かき落とし
板を設けたことを特徴とする静電潜像現像装置。a cylindrical sleeve to which a two-component developer is attached and which moves the developer by rotation; and a cylindrical sleeve arranged concentrically inside the sleeve to suction and hold the developer on the sleeve;
An electrostatic latent image developing device comprising: a magnet that rotates in accordance with the sleeve; a developing device incorporating the sleeve and storing the developer; and a stirring member built in the developing device for stirring the developer. The electrostatic device is characterized in that a developer scraping plate having a ferromagnetic material is provided in sliding contact with the sleeve on the advancing side of the developer from the development area on the sleeve corresponding to the electrostatic latent image. Latent image developing device.
JP26215084A 1984-12-12 1984-12-12 Device for developing electrostatic latent image Pending JPS61138972A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26215084A JPS61138972A (en) 1984-12-12 1984-12-12 Device for developing electrostatic latent image

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26215084A JPS61138972A (en) 1984-12-12 1984-12-12 Device for developing electrostatic latent image

Publications (1)

Publication Number Publication Date
JPS61138972A true JPS61138972A (en) 1986-06-26

Family

ID=17371750

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26215084A Pending JPS61138972A (en) 1984-12-12 1984-12-12 Device for developing electrostatic latent image

Country Status (1)

Country Link
JP (1) JPS61138972A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS649262U (en) * 1987-07-08 1989-01-18

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS649262U (en) * 1987-07-08 1989-01-18

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