JPS61121073A - Developing device - Google Patents

Developing device

Info

Publication number
JPS61121073A
JPS61121073A JP24199584A JP24199584A JPS61121073A JP S61121073 A JPS61121073 A JP S61121073A JP 24199584 A JP24199584 A JP 24199584A JP 24199584 A JP24199584 A JP 24199584A JP S61121073 A JPS61121073 A JP S61121073A
Authority
JP
Japan
Prior art keywords
latent image
image carrier
magnetic
magnet
cylindrical sleeve
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
JP24199584A
Other languages
Japanese (ja)
Inventor
Yoshio Yamazaki
芳男 山崎
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.)
Konica Minolta Inc
Original Assignee
Konica Minolta 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 Konica Minolta Inc filed Critical Konica Minolta Inc
Priority to JP24199584A priority Critical patent/JPS61121073A/en
Publication of JPS61121073A publication Critical patent/JPS61121073A/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 prevent unnecessary sticking of a magnetic developer to prevent unnecessary consumption of the magnetic developer, the degradation in the early stage of a latent image carrier, and the increase of the load of cleaning by making a magnet still in the position, where its magnetic pole approaches most a crest cutting plate, in a latent image non-forming part of the latent image carrier. CONSTITUTION:When the latent image non-forming part of a latent image carrier 2 is placed in a latent image area, only a cylindrical sleeve 3 is rotated, and a magnet 7 is not rotated and is supported axially in the free state, and therefore, one magnetic pole of the magnet 7 is made still in the position where it approaches most a crest cutting plate 6. Thus, lines of the magnetic force transversing a supply gate 5 are fixed to a maximum value, and therefore, the quantity of a magnetic developer 4 pulled out through the supply gate 5 by the rotation of the cylinder sleeve 3 is minute, and it is not brought into contact with the latent image non-forming part of the latent image carrier 2 even if it is led to a part near the latent image carrier 2.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は現像装置に関し、特に、潜像担持体上に形成
された潜像を磁性現像剤で可視化するようにした現像装
置に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a developing device, and particularly to a developing device that visualizes a latent image formed on a latent image carrier using a magnetic developer. .

〔従来技術〕[Prior art]

従来、潜像担持体上に形成された潜像を磁性現像剤で可
視化するようにした現像装置においては、潜像担持体が
回転するのに伴ってその表　　。Conventionally, in a developing device in which a latent image formed on a latent image carrier is visualized using a magnetic developer, as the latent image carrier rotates, the surface of the latent image changes.

面に常に磁性現像剤が摺擦または接触していたために磁
性現像剤と潜像担持体との摩擦帯電や残留電荷等によっ
て非潜像形成部分にも磁性現像剤か付着して終い、この
ために磁性現像剤を無駄に消費してしまう結果となって
いた。Because the magnetic developer was constantly rubbing against or in contact with the surface, the magnetic developer also adhered to non-latent image forming areas due to frictional charging between the magnetic developer and the latent image carrier, residual charges, etc. As a result, magnetic developer is wasted.

また、前記のようなために潜像担持体の劣化を速め、さ
らに、クリーニングの負荷を増大させてしまという欠点
を有していた。Furthermore, the above-mentioned problems have the drawbacks of accelerating the deterioration of the latent image carrier and further increasing the burden of cleaning.

〔発明の目的〕[Purpose of the invention]

この発明は前記のような従来のもののもつ欠点を排除し
て、磁性現像剤の不要な付着を防止し、それにより磁性
現像剤の無駄な消費や潜像坦持体の早期劣化およびクリ
ーニングの負荷増大を防止し、しかもこれらを安価に、
かつ、容易に実現することのできる現像装置を提供する
ことを目的とする。This invention eliminates the drawbacks of the conventional ones as described above and prevents unnecessary adhesion of magnetic developer, thereby reducing wasteful consumption of magnetic developer, early deterioration of the latent image carrier, and cleaning burden. Preventing the increase and also making these inexpensive.
Further, it is an object of the present invention to provide a developing device that can be easily realized.

〔発明の構成〕[Structure of the invention]

この発明は、潜像担持体上に形成された潜像を磁性現像
剤で可視化する現像装置において、前記潜像担持体に近
接して回転する円筒スリーブを設け、前記円筒スリーブ
の外側に近接して前記円筒スリーブとの間に前記潜像担
持体への前記磁性現像剤の供給ゲートを形成する磁性を
有する穂切板を設け、一方、前記円筒スリーブの内側に
磁石をその磁極が移動可能に配設し、前記潜像担持体上
の非潜像形成部分に対して前記磁石をその磁極が前記穂
切板に最も接近した位置に静止させるようにした構成を
有している。This invention provides a developing device that visualizes a latent image formed on a latent image carrier using a magnetic developer, in which a cylindrical sleeve that rotates close to the latent image carrier is provided, and a cylindrical sleeve that rotates close to the outer side of the cylindrical sleeve is provided. A magnetic cutting plate forming a supply gate for the magnetic developer to the latent image carrier is provided between the cylindrical sleeve and the magnetic pole of the magnet is movable inside the cylindrical sleeve. The magnet is arranged such that the magnet is stopped at a position where its magnetic pole is closest to the ear cutting plate with respect to a non-latent image forming portion on the latent image carrier.

〔発明の実施例〕[Embodiments of the invention]

以下、図面に示すこの発明の実施例について説明する。 Embodiments of the invention shown in the drawings will be described below.

第１〜３図にはこの発明による現像装置の一実施例が示
されており、この現像装置１は、矢印方向に回転するド
ラム状の潜像担持体２に近接して、矢印方向に回転する
非磁性の円筒スリーブ３が設けられ、円筒スリーブ３の
外側に近接して、円筒スリーブ３との間に潜像担持体２
への磁性現像剤４の供給ゲート５を形成する磁性を有す
るステンレス製の穂切板６が設けられ、また、円筒スリ
ーブ３の内側に、磁性が周囲に複数配置されたロール伏
の磁石７が円筒スリーブ３と同心に、かつ、矢印方向に
回転可能に設けられている。1 to 3 show an embodiment of a developing device according to the present invention, and this developing device 1 is arranged close to a drum-shaped latent image carrier 2 that rotates in the direction of the arrow. A non-magnetic cylindrical sleeve 3 is provided close to the outside of the cylindrical sleeve 3, and a latent image carrier 2 is placed between the cylindrical sleeve 3 and the cylindrical sleeve 3.
A magnetic stainless steel cutting plate 6 forming a supply gate 5 for supplying the magnetic developer 4 to the cylindrical sleeve 3 is provided, and inside the cylindrical sleeve 3, a rolled magnet 7 with a plurality of magnetic particles arranged around the circumference is provided. It is provided concentrically with the cylindrical sleeve 3 and rotatable in the direction of the arrow.

磁性現像剤４は平均粒径が略１ｏμｍの１成分絶縁性磁
性トナーであり、穂切板６と円筒スリーブ３との間隙Ｈ
はＨ−０，２〜ｏ、３５ｍｍ、円筒スリーブ３と潜像担
持体２との間隔りはＤ＝０．２〜０．３０ｍであり、円
筒スリーブ３の回転数は１５０〜Ｌ８０ｒ−ｐ−ｍ、磁
石７の回転数は８００〜１２ｏｏｒ−ｐ−ｍとなってい
る。The magnetic developer 4 is a one-component insulating magnetic toner with an average particle size of approximately 1 μm.
is H-0,2~o, 35mm, the distance between the cylindrical sleeve 3 and the latent image carrier 2 is D=0.2~0.30m, and the rotation speed of the cylindrical sleeve 3 is 150~L80r-p- m, and the rotation speed of the magnet 7 is 800 to 12 oor-pm.

そして、前記層像担持体２上の潜像形成部分が現像領域
にあるとき磁石７は回転し、また、潜像担持体２上の非
潜像形成部分が現像領域にあるとき磁石７は回転せず、
自由に回転可能な状態に軸支されるようになっている。The magnet 7 rotates when the latent image forming area on the layered image carrier 2 is in the development area, and the magnet 7 rotates when the non-latent image forming area on the latent image carrier 2 is in the developing area. Without,
It is pivoted so that it can rotate freely.

つぎに前記のものの作用について説明する。Next, the operation of the above will be explained.

まず、前記潜像担持体２上の潜像形成部分が現像領域に
あるときは、前記円筒スリーブ３および磁石７が両方と
も回転するため、供給ゲート５を横切る磁力線が磁極の
通過にともなって増減を繰り返し、そのために現像に必
要な量の磁性現像剤４が円筒スリーブ３０回転によって
供給ゲート５を通過して引き出されたのち、潜像担持体
２に導かれて潜像担持体２上の潜像形成部分に接触して
それを現像する。First, when the latent image forming portion on the latent image carrier 2 is in the development area, both the cylindrical sleeve 3 and the magnet 7 rotate, so the lines of magnetic force crossing the supply gate 5 increase and decrease as the magnetic poles pass. The amount of magnetic developer 4 necessary for development is drawn out through the supply gate 5 by 30 rotations of the cylindrical sleeve, and then guided to the latent image carrier 2 and deposited on the latent image carrier 2. Contact the imaged area and develop it.

また、前記潜像担持体２上の非潜像形成部分が現像領域
にあるときは、前記円筒スリーブ３のみが回転し、磁石
７は回転せずにフリー状態に軸支されるため、磁石７は
そのどれか１つの磁極が穂切板６に最も接近した位置に
静止されて、供給ゲート５を横切る磁力線が実質的に最
大値に固定され、そのため円筒スリーブ３の回転によっ
て供給ゲート５を通過して引出される磁性現像剤４の量
は微量で潜像担持体２の近接位置まで導びかれたとして
も潜像担持体２上の非潜像形成部分には接触しないもの
である。Further, when the non-latent image forming portion on the latent image carrier 2 is in the development area, only the cylindrical sleeve 3 rotates, and the magnet 7 does not rotate and is pivoted in a free state. is fixed at a position where one of the magnetic poles is closest to the ear cutting plate 6, and the magnetic field lines crossing the supply gate 5 are substantially fixed at the maximum value, so that the rotation of the cylindrical sleeve 3 passes through the supply gate 5. The amount of magnetic developer 4 drawn out is so small that even if it is brought close to the latent image carrier 2, it does not come into contact with the non-latent image forming portion on the latent image carrier 2.

第４．５図にはこの発明による現像装置の他の実施例が
示されており、この現像装置［Ｉは、潜像担持体２上の
潜像形成部分が現像領域にあるとき、第４図に示すよう
に磁石１７はその磁極が穂切板１６から最も離隔した位
置に静止保持され、また、前記潜像担持体２上の非潜像
形成部分が現像領域にあるとき、第５図に示すように磁
石１７はそのどれか１つの磁極が穂切板１６に最も接近
した位置に静止保持されるようになっている。FIG. 4.5 shows another embodiment of the developing device according to the present invention. As shown in FIG. As shown in FIG. 2, the magnet 17 is held stationary at a position where one of its magnetic poles is closest to the ear cutting plate 16.

なお、前記磁性現像剤Ｉ４は磁性キャリヤと磁性または
非磁性トナ〜とからなる２成分磁性現像剤であり、また
、１８は攪拌部材である。The magnetic developer I4 is a two-component magnetic developer consisting of a magnetic carrier and a magnetic or non-magnetic toner, and 18 is a stirring member.

次に前記のものの作用について説明する。Next, the operation of the above will be explained.

まず、前記潜像担持体２上の潜像形成部分が現像領域に
あるときは、磁石１７はその磁極が穂切板１６から最も
離隔した位置に静止保持されるため、供給ゲート１５を
横切る磁力線が実質的に最小値に固定され、そのため現
像に必要な量の磁性現像剤１４が円筒スリーブ１３の回
転によって供給ゲート１５を通過して引き出され潜像担
持体２に導かれて潜像担持体２上の潜像形成部分に接触
してそれを現像する。First, when the latent image forming portion on the latent image carrier 2 is in the development area, the magnetic pole of the magnet 17 is held stationary at a position farthest from the ear cutting plate 16, so that the lines of magnetic force that cross the supply gate 15 is substantially fixed at a minimum value, and therefore, the amount of magnetic developer 14 required for development is drawn out through the supply gate 15 by the rotation of the cylindrical sleeve 13 and guided to the latent image carrier 2. 2 to develop it.

また、潜像担持体２上の非潜像形成部分が現像領域にあ
るときは、磁石１７はそのどれか１つの磁極が穂切板１
６に最も接近した位置に静止保持されるため、供給ゲー
ト１５を横切る磁力線が実質的に最大値に固定され、そ
のため円筒スリーブ１３の回転によって供給ゲート１５
を通過して引き出される磁性現像剤１４の量は微量で、
潜像担持体２の近接位置まで導かれても潜像担持体２上
の非潜像形成部分には接触しない。Further, when the non-latent image forming portion on the latent image carrier 2 is in the development area, one of the magnetic poles of the magnet 17 is connected to the ear cutting plate 1.
6, the magnetic field lines across the feed gate 15 are substantially fixed at a maximum value, so that rotation of the cylindrical sleeve 13 causes the feed gate 15 to be held stationary.
The amount of magnetic developer 14 drawn out after passing through is very small;
Even if it is guided to a position close to the latent image carrier 2, it does not come into contact with the non-latent image forming portion on the latent image carrier 2.

なお、前記実施例においては磁石７を矢印方向に回転す
るようにしたがこれと反対方向に回転するようにしても
よく、また、前記実施例においては磁石７を静止させる
ときも円筒スリーブ３を回転するようにしたが、磁石７
の静止時には円筒スリーブ３も静止させるようにしても
よいものである。In the embodiment described above, the magnet 7 was rotated in the direction of the arrow, but it may be rotated in the opposite direction. Also, in the embodiment described above, the cylindrical sleeve 3 is rotated when the magnet 7 is kept stationary. I set it to rotate, but magnet 7
When the cylinder is stationary, the cylindrical sleeve 3 may also be stationary.

また、磁石７の回転をオン、オフすることはクラッチ等
の断、続によって容易に可能であり、また、前記磁石１
７の磁極位置を移動させることはカム等の作動によって
容易に可能であり、また、前記潜像担持体２上の潜像形
成部分または非潜像形成部分のいずれが現像領域にある
かの判断は、帯電制御または露光制御等から容易に検知
してフィードバックすることが可能であり、さらに、潜
像は静電的または磁気的いずれでもよいものである。Further, the rotation of the magnet 7 can be easily turned on and off by disconnecting and connecting a clutch, etc.
The position of the magnetic pole 7 can be easily moved by the operation of a cam or the like, and it is also possible to determine whether the latent image forming portion or the non-latent image forming portion on the latent image carrier 2 is in the development area. can be easily detected and fed back from charging control or exposure control, and furthermore, the latent image may be either electrostatic or magnetic.

〔発明の効果〕〔Effect of the invention〕

この発明は前記のように構成したことにより、磁性現像
剤の不要な付着を未然に、かつ、確実に防止することが
でき、そのため、磁性現像剤の無駄な消費をなくすこと
ができるとともに、潜像担持体の耐久性を大幅に向上さ
せ、またクリーニングの負荷を大幅に軽減させることが
でき、しかもこれらを安価に、かつ、容易に実現するこ
とができるなどのすぐれた効果を有するものである。By configuring the present invention as described above, it is possible to prevent unnecessary adhesion of magnetic developer in advance and reliably, thereby eliminating wasteful consumption of magnetic developer and It has excellent effects such as greatly improving the durability of the image carrier and greatly reducing the cleaning load, and also being able to achieve these easily and inexpensively. .

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

第１図はこの発明による現像装置の一実施例番示す説明
図、第２．３図は第１図のもののそれぞれ異なった動作
を示す要部の拡大図、第４．５図はこの発明による現像
装置の他の実施例のそれぞれ異なった動作を示す説明図
である。 １．１）・・・・・・現像装置 ２・・・・・・潜像担持体 ３．１３・・・・・・円筒スリーブ ４．１４・・・・・・磁性現像剤 ５．１５・・・・・・供給ゲート ６．１６・・・・・・穂切板 ７．１７・・・・・・磁石 １８・・・・・・攪拌部材 第１図 第２図 第３図Fig. 1 is an explanatory diagram showing an embodiment of the developing device according to the present invention, Figs. 2.3 are enlarged views of essential parts of the one in Fig. 1 showing different operations, and Fig. 4.5 is an explanatory diagram showing an embodiment of the developing device according to the present invention. FIG. 7 is an explanatory diagram showing different operations of other embodiments of the developing device. 1.1)...Developing device 2...Latent image carrier 3.13...Cylindrical sleeve 4.14...Magnetic developer 5.15. ...Feeding gate 6.16 ... Ear cutting plate 7.17 ... Magnet 18 ... Stirring member Fig. 1 Fig. 2 Fig. 3

Claims (3)

【特許請求の範囲】[Claims] （１）潜像担持体上に形成された潜像を磁性現像剤で可
視化する現像装置において、前記潜像担持体に近接して
回転する円筒スリーブを設け、前記円筒スリーブの外側
に近接して前記円筒スリーブとの間に前記潜像担持体へ
の前記磁性現像剤の供給ゲートを形成する磁性を有する
穂切板を配設し、一方、前記円筒スリーブの内側に磁石
をその磁極が移動可能に設け、前記潜像担持体上の非潜
像形成部分に対して前記磁石をその磁極が前記穂切板に
最も接近した位置に静止させるように構成したことを特
徴とする現像装置。(1) In a developing device that visualizes a latent image formed on a latent image carrier using a magnetic developer, a cylindrical sleeve that rotates close to the latent image carrier is provided, and a cylindrical sleeve that rotates close to the outer side of the cylindrical sleeve is provided. A magnetic cutting plate forming a supply gate for the magnetic developer to the latent image carrier is disposed between the cylindrical sleeve and a magnet whose magnetic pole is movable inside the cylindrical sleeve. 1. A developing device, characterized in that the magnet is configured to be stationary at a position where its magnetic pole is closest to the ear cutting plate with respect to a non-latent image forming portion on the latent image carrier. （２）前記磁石は、前記潜像担持体上の潜像形成部分に
対しては磁極が前記円筒スリーブに沿って回転するよう
になっている特許請求の範囲第１項記載の現像装置。(2) The developing device according to claim 1, wherein the magnet has a magnetic pole that rotates along the cylindrical sleeve with respect to a latent image forming portion on the latent image carrier. （３）前記磁石は、前記潜像担持体上の潜像形成部分に
対しては磁極が前記穂切板から最も離隔した位置に静止
するようになっている特許請求の範囲第１項記載の現像
装置。(3) The magnet is configured such that, with respect to the latent image forming portion on the latent image carrier, the magnetic pole is stationary at a position farthest from the ear cutting plate. Developing device.
JP24199584A 1984-11-16 1984-11-16 Developing device Pending JPS61121073A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24199584A JPS61121073A (en) 1984-11-16 1984-11-16 Developing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24199584A JPS61121073A (en) 1984-11-16 1984-11-16 Developing device

Publications (1)

Publication Number Publication Date
JPS61121073A true JPS61121073A (en) 1986-06-09

Family

ID=17082680

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24199584A Pending JPS61121073A (en) 1984-11-16 1984-11-16 Developing device

Country Status (1)

Country Link
JP (1) JPS61121073A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2008207628B2 (en) * 2007-12-28 2011-07-14 Fuji Xerox Co., Ltd. Developing unit, developing device and image forming apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2008207628B2 (en) * 2007-12-28 2011-07-14 Fuji Xerox Co., Ltd. Developing unit, developing device and image forming apparatus

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