JPS6150172A - Developing device - Google Patents

Abstract

PURPOSE:To obtain a compact developing device by providing an elastic scraping member in a developing vessel so that this member is brought into contact with the surface of a developing sleeve. CONSTITUTION:A scraping plate 7' is provided which is brought into contact with the surface of a developing sleeve 2 in the developing vessel and consists of a flexible resin sheet such as mylar or the like or an elastic sheet such as rubber or the like. Since the elastic scraping plate 7' is provided to be brought into contact with the surface of the developing sleeve 2, the compact developing device is obtained.

Description

【発明の詳細な説明】 （イ）産業上の利用分野 本発明は現像スリーブ上に残留する現像剤の掻き落し部
材の取付けが容易でコンパクトな構造の現像装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a developing device having a compact structure in which a member for scraping off developer remaining on a developing sleeve can be easily attached.

（ロ）従来技術 １α子写真複写機やファクシミリなどにおいては、感光
体ま九Ｆｉ誘電体上に形成された静電潜像を可視像とす
るのに磁気ブラシ型の現像装置が用いられている。(b) Prior Art In photocopying machines, facsimile machines, etc., a magnetic brush type developing device is used to convert the electrostatic latent image formed on the photoreceptor into a visible image. There is.

第３図は従来用−られている磁気ブラシ型現像装置の概
略Ｉｓ図であり、現像剤を収納する現像容器１内に非磁
性且つ導電性材料で作られたスリーブ２が感光体３ａの
表面に近接して矢印方向に回転し得るように設けられ、
スリーブ２の内部には１個の主磁石４ａと複数個の補助
磁石４ｂが交互に保持体５に固定して配置されている。FIG. 3 is a schematic Is diagram of a conventional magnetic brush type developing device, in which a sleeve 2 made of a non-magnetic and conductive material is placed inside a developing container 1 that stores developer, and a sleeve 2 is placed on the surface of a photoreceptor 3a. is provided so as to be able to rotate in the direction of the arrow in the vicinity of the
Inside the sleeve 2, one main magnet 4a and a plurality of auxiliary magnets 4b are alternately arranged and fixed to the holder 5.

スリーブ２の一部が回転ドラム３０表面に形成場れた感
光体３ａに近接するように配置されており、この近接位
置が現像位置である。A portion of the sleeve 2 is placed close to the photoreceptor 3a formed on the surface of the rotating drum 30, and this close position is a developing position.

嘔で、スリーブ２が矢印方向に回転すると、補助磁石４
ｂの磁気作用により現像剤りがスリーブの表面に吸引さ
れてスリーブ２とともに搬送され、感光体３ａに最も接
近した現像位置で主磁石４ａの磁気作用によりブラシ状
に立ち上り、感光体３ａ上に形成場れている静電層＠牙
摺擦する。現像剤中のトナーは搬送中に互いにこすられ
て帯電しているので、静電潜像に吸引され静電潜像は可
視像となる。When the sleeve 2 rotates in the direction of the arrow, the auxiliary magnet 4
The developer is attracted to the surface of the sleeve by the magnetic action of b and is transported together with the sleeve 2, and at the developing position closest to the photoreceptor 3a, it rises like a brush due to the magnetic action of the main magnet 4a and is formed on the photoreceptor 3a. The electrostatic layer that is present is rubbed. The toner in the developer is rubbed against each other during transportation and is charged, so it is attracted to the electrostatic latent image and the electrostatic latent image becomes a visible image.

ところで磁気スリーブ２により搬送された現像剤りは現
像位置において現像に寄与した後そのままスリーブ２上
に残留するため、次の現像前に除去しトナー？現像剤中
に補給する方法が種々知られている。たとえば、第４図
（−ｒ）に示すように、回転ドラム３とスリーブ２とが
現像位置において互いに逆方向に相対移動するような現
像装置では補助磁石４ｂの１つ（破線で示しである）を
設けずにおき、現＠を終ってスリーブ上に残留する現像
剤をその位置で自重に−より落下させる方法や、同図（
ロンに示すように、回転ドラム３とスリーブ２とが現像
位置において同方向に相対移動するような現像装置では
ｐ＆き落し板６や撹拌部材（図示せず）により現像剤？
除去する方法がある。いずれの方法にしても感光体３ａ
から除去された現像剤は現像容器１内に設けられた攪拌
羽根などにより攪拌される。By the way, the developer carried by the magnetic sleeve 2 remains on the sleeve 2 after contributing to the development at the development position, so it must be removed before the next development. Various methods are known for replenishing the developer. For example, as shown in FIG. 4(-r), in a developing device in which the rotating drum 3 and the sleeve 2 move relative to each other in opposite directions at the developing position, one of the auxiliary magnets 4b (indicated by a broken line) There is a method in which the developer remaining on the sleeve after development is dropped by its own weight at that position without providing a
In a developing device in which the rotating drum 3 and the sleeve 2 move relative to each other in the same direction at the developing position, as shown in FIG.
There is a way to remove it. In either method, the photoreceptor 3a
The developer removed from the developer container 1 is stirred by a stirring blade provided in the developer container 1.

（ハ）発明が解決しようとした問題点 この種の現像装置においては、現像剤の掻き落し板に耐
久性のある金属板が用いられる傾向があるが、このよう
な剛性のある掻き落し板はスリーブ表面？損傷しないよ
うにスリーブかられずかヰＥ間させて配置しなければな
らない。このために現像剤を完全に除去することがむづ
かしく、連続複写？した場合に画像濃度が低下するとい
う問題があるほかに、製造上の精度を高くし調整が面倒
であるという問題もある。(c) Problems that the invention seeks to solve In this type of developing device, there is a tendency for a durable metal plate to be used as a developer scraping plate. Sleeve surface? It must be placed away from the sleeve to avoid damage. This makes it difficult to completely remove the developer, making continuous copying difficult? In this case, there is a problem that the image density decreases, and there is also a problem that the manufacturing precision is high and adjustment is troublesome.

これらの問題に加えて、最近の複写機の小型化傾向から
現像装置も小型化せざると得す、そのために現像容器内
に現像剤の掻き落し板や攪拌羽根を設けることはスペー
ス的に困難であるという問題がある。In addition to these problems, the recent trend toward downsizing of copying machines has forced the development device to be downsized, which makes it difficult to install developer scraping plates and stirring blades in the developer container due to space limitations. There is a problem that.

に）発明の目的および構成 本発明は上記の点にかんがみてなされたもので、コンパ
クトな現像装置を提供することを目的とし、この目的を
達成するために、現像剤内部に、現像スリーブの表面に
軽く接融するように可撓性または弾性掻き落し部材を設
けたものである。B) Object and Structure of the Invention The present invention has been made in view of the above points, and an object of the present invention is to provide a compact developing device. A flexible or elastic scraping member is provided so as to be lightly fused to the surface.

゛（至）実施例 以下本発明を図面に基づいて説明する〇第１図は本発明
による現像装置の一実施例の要部の概略線図であり、現
像スリーブ２０表面にマイラーなどの可撓性樹脂シート
またはゴムなどの弾性シートで作った掻き落し板τを軽
く接触させたものである。゛(Example) The present invention will be explained below based on the drawings.゛ Fig. 1 is a schematic diagram of the main parts of an embodiment of the developing device according to the present invention. A scraping plate τ made of a flexible resin sheet or an elastic sheet such as rubber is lightly contacted.

このように掻き落し板τを可撓性または弾性のあるシー
ト部材で作れば掻き落し板τの先端を現像スリーブ２０
表面に接触させて設けることができるので、製造上の高
精反や調整が必要でなく、シかも掻き落し時にスリーブ
表面を損傷することがない。If the scraping plate τ is made of a flexible or elastic sheet member in this way, the tip of the scraping plate τ can be attached to the developing sleeve 20.
Since it can be provided in contact with the surface, there is no need for high-precision fabrication or adjustment during manufacturing, and the sleeve surface will not be damaged during scraping.

第２図は本発明による現像装置の他の実施列の要部の概
略腺図であり、この実施例は第１図の実施例と同様な可
撓性または弾性のあるシート部材で作った攪拌板８を点
Ａを中心に矢印方向に回転させその先端が感光体３ａに
軽く接するように措成したものである。FIG. 2 is a schematic diagram of the essential parts of another embodiment of the developing device according to the present invention, and this embodiment is an agitator made of a flexible or elastic sheet member similar to the embodiment of FIG. The plate 8 is rotated about point A in the direction of the arrow so that its tip lightly touches the photoreceptor 3a.

このようにすれば攪拌板８の先端が現像スリーブの表面
を損傷することなく現像剤の掻き落しができるとともに
掻き落した現像剤を攪拌板８により攪拌するので、現像
容器中の現像剤とよく混合嘔れる。この実施列の場合も
攪拌板８の製造上の精度や調整の問題もなく、安定した
画像濃度が得られる。In this way, the tip of the stirring plate 8 can scrape off the developer without damaging the surface of the developing sleeve, and since the scraped off developer is stirred by the stirring plate 8, it can be mixed with the developer in the developing container. Mixed vomiting. In this case as well, there are no problems with manufacturing accuracy or adjustment of the stirring plate 8, and stable image density can be obtained.

（へ）発明の詳細 な説明したように、本発明においては、現像容器内部に
現像スリーブの表面に軽く接触するように可撓性または
弾性のある掻き落し部材を設けたので、スリーブを損傷
せずに成苗現像剤の掻き落しが確実にできることはもち
ろんのこと、掻き落し２部材の製造上の精度がそれほど
問題にならず取付時の調整が容易となる。特に、掻き落
し部材を回転式せて攪拌機能？もたせれば、現像容器内
部に独立して攪拌手段を設ける必要がないため小型の現
像装置には好適でおる。(f) As described in detail of the invention, in the present invention, a flexible or elastic scraping member is provided inside the developer container so as to lightly contact the surface of the developer sleeve, so that the sleeve is not damaged. Not only can the adult seedling developer be reliably scraped off without any scratches, but the manufacturing precision of the scraping member 2 is not so problematic, and adjustment at the time of installation is facilitated. In particular, is there a stirring function with a rotating scraping member? If this is done, there is no need to provide an independent stirring means inside the developing container, which is suitable for small-sized developing devices.

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

第１図は本発明による現像装置の一実施例の要部概略線
図、第２図は本発明による現像装置の他の実施例の要部
概略線図、第３図は従来の磁気ブラシ型現像装置の概略
線図、第４図（イ〕および（ロ）は従来の現像装置にお
ける残留現像剤除去の２つの異なる方法を説明する線寵
である。 １・・・現像容器、２・・・スリーブ、３・・・回転ド
ラム、３ａ・・・感光体、４ａ・・・主磁石、４ｂ・・
・補助磁石、５・・・保持体、６．７・・・掻き落し仮
、８・・・攪拌板第　１　図 第２図FIG. 1 is a schematic diagram of essential parts of one embodiment of the developing device according to the present invention, FIG. 2 is a schematic diagram of essential parts of another embodiment of the developing device according to the present invention, and FIG. 3 is a conventional magnetic brush type developing device. The schematic diagrams of the developing device, FIGS. 4(a) and 4(b), are diagrams explaining two different methods of removing residual developer in the conventional developing device. 1. Developing container, 2.・Sleeve, 3... Rotating drum, 3a... Photoreceptor, 4a... Main magnet, 4b...
・Auxiliary magnet, 5... Holder, 6.7... Temporary scraping, 8... Stirring plate Fig. 1 Fig. 2

Claims (2)

【特許請求の範囲】[Claims] （１）現像装置内の現像剤を収納する現像容器内部に、
現像スリーブの表面に接触するように可撓性または弾性
掻き落し部材を設けたことを特徴とする現像装置。(1) Inside the developing container that stores the developer in the developing device,
A developing device characterized in that a flexible or elastic scraping member is provided so as to come into contact with the surface of a developing sleeve. （２）前記掻き落し部材が現像剤の攪拌作用を有する特
許請求の範囲第１項に記載の現像装置。(2) The developing device according to claim 1, wherein the scraping member has a developer stirring action.