JPS58211771A - Developing device - Google Patents

Abstract

PURPOSE:To form a uniform toner layer of a thin thickness by disposing a blade of a magnetic material in such a way that the forward end thereof is positioned at the intermediate of the magnetic poles disposed on the inner side of the region where a toner carrier passes. CONSTITUTION:Magnetic poles 10 are disposed in such a way that the forward end of a blade 13 consisting of a magnetic material is disposed so as to be positioned at the intermediate, more preferably the center, between the magnetic poles in a developing device consisting of a toner carrier 6 having said magnetic poles 10 fixedly on the inside and passing near an image carrier 14 and said blade 13 so as to contact slidingly with the surface of said toner carrier. Since the press contact force of the blade is thus reduced, the fixing of the toner on the circumferential surface of the toner carrier or the blade is averted, and the amt. of the toner to be supplied on the carrier 14 is maintained at a high rate. The uniform toner layer of a thin thickness is formed on the surface of the toner carrier over a long period of time.

Description

【発明の詳細な説明】 本発明はトナー担持体の表面にトナーを担持させ°〔像
担体に供給する現渾装置に関し、特にトナー担持体上の
トナ一層厚を規制する磁性体ブレードの先端の周囲の磁
界を適切に設定することによつ゛〔、長期間に亘って層
厚を均一に規制することを可能とした現像装置を提案す
るものであるっ 例えば、スリーブ状のトナー担持体の内側に磁石を回転
ｏＪ能に配設し、その周面に磁性トハ−を磁力により付
層させＣその回転により、靜屯τｎ像が形成された１８
！担体の表面にトナーを供給する現像装置が知ら肛てい
る。而し゛〔、トナー担持体の表面にトナーを薄層厚に
形成するために、弾性を南する磁性体ブレードをトナー
担持体の表面に摺接させて設置する。然るに、この場合
はブレード等にトナーが固着しやすく、トナ一層厚の均
一性が損なわれるという不都合があＬ’ｌ’ｊにトナー
担持体と像担体とを接触させて現像した場合に、複写画
像に白すじ又は黒すじが現われるという欠点がある。ま
た、柔軟性が高い磁性体ブレードを使用し、トナ一層を
薄厚に形成するために、このブレードをその弾性と磁石
からの磁力とを利用して高抑圧力で圧接させた場合は、
グレードの圧接部がトナー担持体との摺接により鍋温に
なり、ブレードにトナーが固着し′Ｃし“まい１、均一
な薄厚のトナ一層をル成することが難しい。更に、トナ
ー相持体の表面を多少の凹凸を有する粗面に調整し、ブ
レードをその支点側がトナー担持体の移動方向下流側に
なるように、新開カウンタ配置する技術が提案されてい
る。然る番こ、この場合はトナー担持体の表面にトナー
が固層し°Ｃトナーフィルミングが起りやすく、隊担体
へのトナー供給量低ド及びトナーの帯電量低下という不
都合が生じやすい。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a developing device that supports toner on the surface of a toner carrier [an image carrier is supplied to an image carrier, and in particular, the present invention relates to a developing device that supports toner on the surface of a toner carrier. By appropriately setting the surrounding magnetic field, we propose a developing device that makes it possible to control the layer thickness uniformly over a long period of time. A magnet is arranged in a rotary manner, and a magnetic toner is layered on the circumferential surface of the magnet by magnetic force.By the rotation of the magnet, an image of τn is formed.
! Developing devices are known that supply toner to the surface of a carrier. [In order to form a thin layer of toner on the surface of the toner carrier, a magnetic blade with elasticity is installed in sliding contact with the surface of the toner carrier. However, in this case, the toner tends to stick to the blade, etc., and the uniformity of the toner thickness is impaired. There is a drawback that white or black streaks appear on the image. In addition, if a highly flexible magnetic blade is used and the blade is pressed with a high suppressing force using its elasticity and the magnetic force from the magnet in order to form a thin toner layer,
The pressure contact part of the grade becomes heated to the pot temperature due to sliding contact with the toner carrier, and the toner adheres to the blade and becomes difficult to form a uniform thin layer of toner.Furthermore, the toner carrier A technique has been proposed in which the surface of the blade is adjusted to be rough with some unevenness, and the blade is arranged in a newly opened counter so that its fulcrum side is on the downstream side in the direction of movement of the toner carrier. In this case, the toner is likely to solidify on the surface of the toner carrier, resulting in °C toner filming, which tends to cause problems such as a low amount of toner supplied to the carrier and a decrease in the amount of charge of the toner.

本発明は以上の点に鑑みてなされたものであって、磁性
体ブレードの先端位置がトナー担持体の通過域の内側に
配設された複数個の磁極の中間になるように各部材を配
設することによつＣ１トナーの固着が起きず長期間に拭
つ゛Ｃ均一な薄厚のトナ一層を形成することができる現
像装置を提供することを目的とする。本発明に係る現像
装置は、静電潜像が形成された像担輿の表面にトナーを
供給しＣ町視鐵化する現像装置において、スリーブ状又
は無端ベルト状をなし前記像担体の近傍をその通過域と
するように移動可能に設けられたトナー相持体止、該ト
ナー担持体の表面にトナーを補給するトナー補給手段と
、前記トナー担持体の移動方向における［ｊり記トナー
補給手段の下流側に配設され前記トナ・−担持体の表面
に摺接するように設けられた値ｉ＋Ｌ体材料からなるグ
レードと、前記トナー担持体の通過域内側＆Ｃその＃動
方向に沿っ°Ｃ相互に適長間ｌ？ｍをおい−Ｃ配設さ７
また複数個の磁極とを有し、該磁極はその中で隣接する
１対の磁極間に対応するＩＪ直に前記グレードの先端が
位置するように配設したことを特徴とするものである。The present invention has been made in view of the above points, and each member is arranged so that the tip of the magnetic blade is located between the plurality of magnetic poles arranged inside the passage area of the toner carrier. It is an object of the present invention to provide a developing device which can form a single layer of uniformly thin toner by wiping for a long period of time without causing toner to stick. A developing device according to the present invention is a developing device that supplies toner to the surface of an image carrier on which an electrostatic latent image is formed, and is shaped like a sleeve or an endless belt and extends near the image carrier. a toner support stop movably provided so as to serve as a passage area; a toner replenishing means for replenishing toner on the surface of the toner bearing member; A grade made of a value i+L material disposed on the downstream side so as to be in sliding contact with the surface of the toner carrier, and a grade made of a value i+L material disposed on the downstream side so as to be in sliding contact with the surface of the toner carrier and the inside of the passage area of the toner carrier &C along its movement direction °C mutually. Appropriate length? m ooi-C arranged 7
The grade is also characterized in that it has a plurality of magnetic poles, the magnetic poles being arranged such that the tip of the grade is located directly at the IJ corresponding to a pair of adjacent magnetic poles.

この、鴨曾におい°ｃ１　前記ブレードの先端の前後両
側に配設された磁極は、同極性又は異極性のいずれでも
よいが、同極性とするときは、Ｈ；ｌ［＋ＩＩＪ略Ｕ字
型の磁石を使用し、その両端の磁極部が前Ｍｒ２グレー
ドの先端の前後両側になるように配設することも可能で
ある。The magnetic poles disposed on both the front and rear sides of the tip of the blade may be of the same polarity or of different polarities, but when they are of the same polarity, H;l[+IIJ approximately U-shaped. It is also possible to use a magnet and arrange it so that the magnetic pole portions at both ends are on both sides of the front end of the previous Mr2 grade.

以ド、本発明の実ＭｇＪ列につぃ゛Ｃ添付の図面を参照
して具体的に説明する。第１図はトナー担持体の担持面
１に摺ｇ７る磁性体ブレード３とトナー担持体の内＃（
ｔｌに配設された磁石２との配置関係を示す模式図であ
る。トナー担持体はスリーブ状の導電性基体の外周面に
一°成体層全形成し′Ｃなシ、この誘畦体層の周面が磁
性トナーの担持面１を構成している。トナー担持体の担
持面１は矢印方向に定速回転駆動され、弾性を有する磁
性体グレード３が新開カウンタ配置され′Ｃいる。担持
面１の内側には、８個の磁極２（磁極２ａ＋　２ｂ−、
２ｃ、　”’　２ｄ　　のみ図示し“〔ある）が担持ｍ
ｌの回転方向の８等配の位置に配設されており、これら
の磁極２からの磁力により磁性トナーを担持面１に吸引
付層させつつブレード３によル薄厚に層形成し、担持面
１の回転によＱ１靜電潜１象が形成きれた像担体の表面
にトナーを搬送して供給する。Hereinafter, the actual MgJ column of the present invention will be explained in detail with reference to the attached drawings. Figure 1 shows the magnetic blade 3 sliding on the carrying surface 1 of the toner carrier and the #(
FIG. 2 is a schematic diagram showing the arrangement relationship with magnets 2 arranged at tl. The toner carrier is formed by forming a complete layer on the outer peripheral surface of a sleeve-shaped conductive substrate, and the peripheral surface of this dielectric layer constitutes the magnetic toner supporting surface 1. The carrying surface 1 of the toner carrying member is rotated at a constant speed in the direction of the arrow, and a magnetic grade 3 having elasticity is disposed in a newly opened counter. Inside the support surface 1, there are eight magnetic poles 2 (magnetic poles 2a+ 2b-,
2c, ``2d only shown'' is carried by m
They are arranged at eight equally spaced positions in the rotation direction of the magnetic poles 2, and the magnetic force from these magnetic poles 2 attracts and adheres the magnetic toner to the supporting surface 1, while the blade 3 forms a thin layer on the supporting surface. By one rotation, toner is conveyed and supplied to the surface of the image carrier on which one Q1 electromagnetic image has been formed.

面して、第２図は横軸に担持面ｌの訣用開始鎌の経過時
間をと９、縦軸に担持面１から像担体へのトナー供給量
をとつＣ，）ナー供給量の経時変化を示すグラフである
が、磁４ｉ！！、２を固定的に設置した場合（図中、実
巌にＣ示す）と、・担持面１の回転方向に回転させた場
合（図中、破線に°Ｃ示す）とでは、トナーの供給蓋に
者しい差があり、また、その＾ヰ時変化の状態も異なる
。このトナー供給量の低ドは、グレード３により層厚が
規制される過程でトナーが担持面１の凹部に固層しＣし
まうからであり、イ直極２を回転させた場合にトナー供
給量が少ないのは、磁極２の回転により強力な磁力が担
持面１に現わＩｔ１磁注体祠料からなるプＶ−ド３を担
持面１に尚押圧力で圧接させるため、トナーの固層量が
多電となるからである。磁極２をグレード３に対しＣ固
定的に設置した場合は、ブレード３の担持面ｌへの圧接
力が低く、トナーの固着量が少ないため、像担体へのト
ナー供給量は多量である。In Fig. 2, the horizontal axis shows the elapsed time of the starting sickle on the supporting surface 9, and the vertical axis shows the amount of toner supplied from the supporting surface 1 to the image carrier. This is a graph showing changes over time, but Magnetic 4i! ! , 2 are fixedly installed (indicated by C in the figure) and when rotated in the direction of rotation of the supporting surface 1 (indicated by the broken line in °C in the figure). There are significant differences, and the state of change over time also differs. This low toner supply amount is due to the toner solidifying in the recesses of the supporting surface 1 in the process where the layer thickness is regulated by grade 3. The reason why the toner is so small is that a strong magnetic force appears on the supporting surface 1 due to the rotation of the magnetic pole 2, which presses the V-dope 3 made of the It1 magnetic abrasive material against the supporting surface 1 with a pressing force. This is because the amount of electricity is high. When the magnetic pole 2 is installed in a C-fixed manner with respect to grade 3, the pressing force of the blade 3 against the carrying surface l is low and the amount of toner adhering is small, so that a large amount of toner is supplied to the image carrier.

一方、第１図に示す如く、磁極２は８等配（て配設され
°〔いるから、隣接する磁極２がその配役中心に対し′
〔なす角度は４５°である。また、グレード３がその先
端にて担持面１に摺接する場合に、磁極２（図示例はｕ
１極２ａ）とそのブレード先端とが、磁極２の配役中心
に対し°Ｃなす角度をＯとする。そし“〔、磁極２をブ
レード３に対して固定的に設置した場合のトナー供給量
とθとの関係を副食した結果、第３図のグラフに示す如
く、トナー供ｇ量とθとの間には極めて強い相関関係が
得ら往た。即ち、ブレード３の先端が磁極２ａ（θ＝０
°）又は磁極２ｂ（θ−４５°）に最も接近した場合に
、トナーの固層量が瑠太し通にトナー供給量は低下する
。On the other hand, as shown in FIG.
[The angle formed is 45°. In addition, when grade 3 comes into sliding contact with the supporting surface 1 at its tip, magnetic pole 2 (in the illustrated example, u
The angle that one pole 2a) and its blade tip make with respect to the center of the magnetic pole 2 is O. Then, as a result of examining the relationship between the toner supply amount and θ when the magnetic pole 2 is fixedly installed relative to the blade 3, as shown in the graph of Fig. 3, the relationship between the toner supply amount and θ is In other words, the tip of the blade 3 is located at the magnetic pole 2a (θ=0
) or closest to the magnetic pole 2b (θ-45°), the toner supply amount decreases as the toner solid layer amount increases.

そし゛〔、ブレード３の先端がｍ極２ａ及び２ｂの中間
にある場合（０°くθ＜４５°）に、トナーの供給量が
多い。これは、グレード３の先端が磁極２ａ又は２ｂに
接近した場合に、磁極２ａ又は２ｂから極めて強い磁力
を受けてブレード３が担持面ｌに強弁圧力で圧接するの
に対し、グレード３の先端が磁極２ａ及び２ｂの中間に
ある場合は、磁極２ａ及び２ｂからの磁力が弱く、ブレ
ード３の圧接力が緩和されＣいるからである。このよう
に、担持面ｌ又はブレード３へのトナー固層を軽減しト
ナー供給量を１￥値に保持するためには、出＆２によシ
担持而１に現われる磁力を適切に設定する必要があり、
そのためには磁極−２を固定的に設置し、ブレード３の
先端が磁極２ａ及び２ｂの中間になるように、ブレード
３及び各磁極２の配置瞥を考慮する必要がある。なお、
この上うな事１ｎは４１図に示す如く、隣躾′ｒる磁５
本が互いに異極である場合に限らず、換性が同一である
ものを隣接して配置した場合でも同様である。■えは、
ｄ↓４図に示すｊａｒｌ＜　、＋ｔｌｊ面Ｕ字型の磁石
４においてｔよ、その両端の磁極部４ａ及び４ｂからは
り虫力な磁界が発生しＣいるが、磁極部４ａ及び４ｂの
中間からの磁界は極めて弱い。このため、第５図に示す
如く、スリーブ状のトナー担持体５の内側に磁石４を固
定的に設直し、ブレード３をその先端が磁極部４ａ及び
４ｂの中間位置に゛Ｃトナー担持体５の周面（担持面）
に摺接するように設置ずれはよい。Then, when the tip of the blade 3 is located between the m poles 2a and 2b (0° and θ<45°), the amount of toner supplied is large. This is because when the tip of the grade 3 approaches the magnetic pole 2a or 2b, the blade 3 receives an extremely strong magnetic force from the magnetic pole 2a or 2b and presses against the supporting surface l with strong pressure, whereas the tip of the grade 3 This is because when the blade is located between the magnetic poles 2a and 2b, the magnetic force from the magnetic poles 2a and 2b is weak, and the pressing force of the blade 3 is relaxed. In this way, in order to reduce the toner solid layer on the supporting surface 1 or the blade 3 and to maintain the toner supply amount at a value of 1, it is necessary to appropriately set the magnetic force appearing on the output &2 and on the supporting surface 1. can be,
For this purpose, it is necessary to install the magnetic pole 2 in a fixed manner and consider the arrangement of the blade 3 and each magnetic pole 2 so that the tip of the blade 3 is located between the magnetic poles 2a and 2b. In addition,
In addition to this, as shown in Figure 41, the magnetic 5
This is true not only when books have different polarities, but also when books with the same polarity are placed adjacent to each other. ■Eha,
d↓In the U-shaped magnet 4 with the jarl< and +tlj faces shown in Figure 4, a strong magnetic field is generated from the magnetic pole parts 4a and 4b at both ends, but from the middle of the magnetic pole parts 4a and 4b The magnetic field is extremely weak. Therefore, as shown in FIG. 5, the magnet 4 is fixedly installed inside the sleeve-shaped toner carrier 5, and the tip of the blade 3 is placed in the middle position between the magnetic pole parts 4a and 4b. peripheral surface (supporting surface)
There should be no misalignment in the installation so that it slides into contact with the

本＠明は上述の如き１睨点に立ってなされたものであり
、以下本発明の具体的実施例について詳細に説明する。This book has been developed based on the above-mentioned viewpoint, and specific embodiments of the present invention will be described in detail below.

第６図は本発明のポｌ実施例を示す模式図でめる。無端
ベルト状に構成された感光体１４が適宜のロー２１５に
張架され゛〔その回転により矢印方向に定速度で移動せ
しめられるようにな？ている。感光体１４はベルト状の
導゛屯性基体上に光導電性物質からなる感光層が形成さ
扛°〔おり、ボ速駆動される間にその表面に例えば負電
荷による一様帯亀がなされ、像露光がなされ゛〔靜電宿
像が形成さ扛た後、本発明に係る現像装置の配設位置に
到達する。FIG. 6 is a schematic diagram showing a polar embodiment of the present invention. The photoreceptor 14, which is configured in the shape of an endless belt, is stretched around a suitable row 215 so that it can be moved at a constant speed in the direction of the arrow by its rotation. ing. The photoreceptor 14 has a photosensitive layer made of a photoconductive substance formed on a belt-shaped conductive substrate, and while the photoreceptor is driven at high speed, a uniform banding is formed on the surface due to, for example, negative charges. After image exposure is performed and a static image is formed, the developing device according to the present invention is located at a location.

トナー担持体６は、スリーブ状の導電性基体７の外周面
に、エポキシ樹脂又はポリエステル樹脂等の誘電体物質
からなる誘電体層８を約７５μｍ径に形成してあり、こ
の誘電体層８の表面に複数個の微小な電極９をトナー担
持体６の幅方向及び周方向の全域に点在させ”〔ある。The toner carrier 6 has a dielectric layer 8 made of a dielectric material such as epoxy resin or polyester resin formed on the outer peripheral surface of a sleeve-shaped conductive base 7 to have a diameter of about 75 μm. A plurality of minute electrodes 9 are dotted on the surface of the toner carrier 6 over the entire area in the width direction and circumferential direction.

この電極９は銅等の金属からなシ、誘電体層８の表層部
に平均約７５μｍ径の銅粒子を埋設した後、その表面を
研摩することにより、第６図に示す如く、半球状の微小
な金属粒とし−Ｃあシ、相互に適長離隔させ゛〔いずれ
もフロート状態に保持され°〔いる。トナー担持体６の
周面はその表面粗さが１２μｍ程度になるように加工さ
れており、トナー相持体６は矢印方向に定速移動する感
光体１４をその通過域の内側に若干押圧するように配設
されＣい５゜そしＣ，トナー担持体６は、その局面が感
光体１４に転動するように１８０　乃至２４Ｏｒ、　ｐ
、　ｒｎ、の回転数で矢印方向に定速回転駆動される。This electrode 9 is made of metal such as copper, and is made by embedding copper particles with an average diameter of about 75 μm in the surface layer of the dielectric layer 8, and then polishing the surface to form a hemispherical shape as shown in FIG. The metal grains are made of fine metal grains and are spaced apart from each other by an appropriate length, and are held in a floating state. The peripheral surface of the toner carrier 6 is processed to have a surface roughness of approximately 12 μm, and the toner carrier 6 is designed to slightly press the photoconductor 14, which is moving at a constant speed in the direction of the arrow, inside its passage area. The toner carrier 6 is disposed at an angle of 180 to 24 Or, p so that its surface rolls onto the photoreceptor 14.
, rn, and is rotated at a constant speed in the direction of the arrow.

トナー相持体６の内側には磁石１０が固定的に設置され
Ｃいる。磁石１０は８個の磁極（磁極１０８．１０ｂ　
等）をトナー担持体６の周方向の８等配の位置に配設し
たものであって、Ｎ極と８極とを交互的に配しＣあ６゜ トナー担持体６の周面における感光体１４と対向する現
像位］ｄの反対側の位置には、トナー１２を貯留したタ
ンク１１が＋Ｊｃｉ設され°Ｃいる。トナー１２はカー
ボン粉末に磁性粉を混合させた所Ｍ　−成分トナー（磁
性トナー）であり、例えば平均粒径が約９μｍ１　　真
比重が約１．８６に調整される。タンク１１の上方には
トナーの層厚を規制するブレード１３が配設され°〔い
る。ブレード１３は約０．１纒厚のＳＫ材又は約０．０
７ｔｌｌ厚のオーステナイト系マルテンサイトステンレ
ス鋼等の磁性材料からクリ、弾性をゼする板状のもので
ｂつ°Ｃ、トナー担持体６の幅方向の略全域におい′〔
トナー担持体６の周１川に摺接するように設けられＣい
る。ブレード１３けその先端にごトナー担持体６の周面
に摺接するように、その先端側をトナー担持体６０回転
方向の上流側に向けて設置され”Ｃおシ、そのブレード
１３の先端が磁石１０におけるブレード１３の近傍の磁
ＱＩＯａ及びｌＱｂの中間、好ましくは中央に対応する
位置に位置するように配設し°〔ある。そしＣ１タンク
１１からトナー担持体６の周面に供給されたトナーはブ
レード１３を通過した瞬に略々１層に層厚を規制され、
またブレード１３とトナー担持体６の周面との間で摩擦
を受けてこれらの材質間の摩擦帯電系列によシ決まる極
性に帯電せしめられる。A magnet 10 is fixedly installed inside the toner carrier 6. The magnet 10 has eight magnetic poles (magnetic pole 108.10b
etc.) are arranged at 8 equally spaced positions in the circumferential direction of the toner carrier 6, and N poles and 8 poles are arranged alternately to increase the photo-sensitivity on the circumferential surface of the toner carrier 6. A tank 11 storing toner 12 is provided at a position opposite to the development position]d facing the body 14. The toner 12 is an M-component toner (magnetic toner) obtained by mixing carbon powder with magnetic powder, and is adjusted to have an average particle size of about 9 μm and a true specific gravity of about 1.86, for example. A blade 13 is provided above the tank 11 to regulate the toner layer thickness. The blade 13 is made of SK material with a thread thickness of about 0.1 or about 0.0
It is made of a magnetic material such as austenitic martensitic stainless steel with a thickness of 7 tll, and is plate-shaped and has no elasticity.
It is provided so as to be in sliding contact with the circumference of the toner carrier 6. The tip of the blade 13 is installed with its tip facing upstream in the rotational direction of the toner carrier 60 so as to be in sliding contact with the circumferential surface of the toner carrier 6. The C1 tank 10 is disposed so as to be located at a position corresponding to the middle, preferably the center, of the magnets QIOa and IQb near the blade 13.The toner supplied from the C1 tank 11 to the circumferential surface of the toner carrier 6 At the moment of passing through the blade 13, the layer thickness is regulated to approximately one layer,
Further, due to friction between the blade 13 and the circumferential surface of the toner carrier 6, the toner carrier 6 is charged to a polarity determined by a frictional charging series between these materials.

１例として、前述の物性を有するトナーを前記条件で層
厚規制する試峡の結果、トナー担持体６の周面上にトナ
ーが約０．９ν讐に層厚規制され、また帯電量は約５．
０μＣ１５＋であった。As an example, as a result of a test in which the layer thickness of the toner having the above-mentioned physical properties was controlled under the above conditions, the layer thickness of the toner on the circumferential surface of the toner carrier 6 was controlled to about 0.9ν, and the amount of charge was about 5.
It was 0μC15+.

次１・こ、Ｗｒかる４４１成を有する本発明装置の動作
にりいｃ７明する。トナー担持体６が回転する間に夕／
り１１からトナー１２がその周面に供給され、トナーは
トナー相持体６とブレード１３とにより１＃樫を受けて
ツタ［定の極性に（ｉｆ　’ｒ４ｔ、　Ｌ　、磁石１０
からの磁力を受け゛Ｃトナー担持体６の周面に付層する
。そし°Ｃ１このトナーはトナー担持体６の回転ととも
に、トナー担持体６が感光体１４と転勤する現像位置に
搬送され、感光体１４の表面に形成された静電潜１象に
供給される。なお、トナー世持体６はその周面に微小な
フロート電極９を配設しであるから、磁極９による所謂
エツジ効果の助長作用によつ−Ｃ，原稿が線画像である
場合に高督度の複写画像が得られ、原稿の種類に応じた
所望の現１＃！特性が得られる。面し゛Ｃ１本発明にお
いては、グレード１３をその先端が磁極１０ａ及び１０
ｂの中間に位置するように配設しであるから、トナー担
持体６及びブレード１３へのトナーの固着が回避され、
第２図及び第３図に示す如く、感光体１４へのトナー供
給量は極めて扁値である一方、トナーの固層が少いから
長期間に亘少均−な薄厚のトナーノーを形成することが
できる。Next, we will explain the operation of the device of the present invention having the Wr441 configuration. While the toner carrier 6 rotates,
The toner 12 is supplied to the peripheral surface from the magnet 11, and the toner receives the 1# oak by the toner carrier 6 and the blade 13 and has a constant polarity (if 'r4t, L, magnet 10
The C toner is applied to the peripheral surface of the toner carrier 6 by the magnetic force from the toner. Then, as the toner carrier 6 rotates, this toner is transported to a development position where the toner carrier 6 moves with the photoreceptor 14, and is supplied to an electrostatic latent image formed on the surface of the photoreceptor 14. Since the toner carrier 6 is provided with a minute float electrode 9 on its circumferential surface, the magnetic pole 9 promotes the so-called edge effect. You can obtain the desired copy image according to the type of original! characteristics are obtained. Facing C1 In the present invention, grade 13 is used with the tips thereof being magnetic poles 10a and 10.
Since it is arranged so as to be located in the middle of b, the toner is prevented from sticking to the toner carrier 6 and the blade 13,
As shown in FIGS. 2 and 3, the amount of toner supplied to the photoreceptor 14 is extremely flat, and since the solid layer of toner is small, a thin and uniform toner layer is formed over a long period of time. I can do it.

次に、本発明の曲の実画し１ｊについ゛Ｃ瀉７図に基い
−〔説明する。・ｔお、第６図の場合と同一物には同−
符号を伺し°〔説明を省略する。本夾施例は第６図に示
す実施例の磁石ｌＯの替シに磁石１６を設置したもので
ある。磁石１６はグレード１３側に配設された磁極１６
ａと感光体１４１１１ＩＩに配設された磁極１６ｂ、１
６ｃ及び１６ｄとを壱する。磁極１６ａは断面Ｕ字型を
なし、その両端の磁極部１７ａ及び１７ｂ（図示例はＮ
極性）が、ブレード１３の先端に対応する位置を挾んで
そのトナー搬送方間に関し前後両側に適長間隔をおいて
位置するように設置されている。即ち、ブレード１３の
先端がトナー担持体６と摺接する位置が同極性の磁極部
１７ａ及び１７１）の中間になるように磁極１６ａを設
置しである。なお、感光体１４側の磁極１６ｂ。Next, an actual drawing 1j of the song of the present invention will be explained based on FIG.・T, the same thing as in the case of Figure 6 is the same.
Ask for the code ° [Explanation omitted. In this embodiment, a magnet 16 is installed in place of the magnet IO of the embodiment shown in FIG. The magnet 16 is a magnetic pole 16 arranged on the grade 13 side.
a and the magnetic poles 16b and 1 arranged on the photoreceptor 14111II.
6c and 16d. The magnetic pole 16a has a U-shaped cross section, and magnetic pole portions 17a and 17b at both ends (the illustrated example is N
The blades (polarity) are installed so as to sandwich the position corresponding to the tip of the blade 13 and to be positioned at appropriate length intervals on both front and rear sides with respect to the toner conveying direction. That is, the magnetic pole 16a is installed so that the position where the tip of the blade 13 makes sliding contact with the toner carrier 6 is located between the magnetic pole parts 17a and 171) of the same polarity. Note that the magnetic pole 16b on the photoreceptor 14 side.

１６Ｃ及び１６ｄは隣接するものの極性が相互４／ｃ異
他となるように適長離隔させて配役し゛〔ある。16C and 16d are spaced apart by an appropriate length so that the polarities of adjacent ones are 4/c different from each other.

本実Ｉｌ！１１りＩＪにおいても、タンク１１からトナ
ー担持体６の周ｍに供給されたトナー１２Ｃ・よ、ブレ
ード１３にまり層厚を規制さノｔ１　　ブレード１３及
びトナー担持体６の周面との間で摩擦帯電を受け、磁石
１６の磁力によりトナー担持体６の周面に付着し・Ｃ１
その回転により感光体１４と転動する現１象位面１に搬
送され、静電潜像が形成された感光体１４の表面に供給
される。Honestly Il! In 11-IJ, the toner 12C supplied from the tank 11 to the circumferential surface of the toner carrier 6 gets stuck on the blade 13 and the layer thickness is regulated. After receiving frictional electrification, the toner adheres to the circumferential surface of the toner carrier 6 due to the magnetic force of the magnet 16.
Due to the rotation, the image is conveyed to the image plane 1 that rolls with the photoreceptor 14, and is supplied to the surface of the photoreceptor 14 on which the electrostatic latent image is formed.

面しこい　本実施例においても、ブレート１３の先端部
１６１が磁極部１７ａ及び１７ｂの中間にあるから、第
４図に示す如く、磁石１６によりブレード１３の先端近
１労に現われる磁界が弱く、その磁力を受けるブレード
１３がトナー相持体６の周面に押圧される際の圧接力が
低い。このため、トナー担持体６０周面にトナーフィル
ミングが発生し罐い。また、グレード１３の先端の両開
に配役された磁極部１７ａ及び（７ｂが同極性であるか
ら、その磁力線は第４図に矢印に゛〔示す如く分布する
。この／ヒめ、ブレード１３の先端近傍にて、トナー」
旦持体６の周面上のトナーが循環するように運動するか
ら、トナーに混入していた紙粉等の異物が容易に除去さ
れ、またトナーの循環によりトナ一層の均一な薄層化が
容易となる。Complicated Also in this embodiment, since the tip 161 of the blade 13 is located between the magnetic pole portions 17a and 17b, the magnetic field produced by the magnet 16 near the tip of the blade 13 is weak, as shown in FIG. The pressing force when the blade 13 receiving the magnetic force is pressed against the circumferential surface of the toner carrier 6 is low. Therefore, toner filming occurs on the circumferential surface of the toner carrier 60. In addition, since the magnetic pole parts 17a and 7b placed on both sides of the tip of the grade 13 have the same polarity, the lines of magnetic force are distributed as shown by the arrows in FIG. Toner near the tip
Since the toner on the circumferential surface of the holding body 6 moves in a circulating manner, foreign matter such as paper powder mixed in the toner can be easily removed, and the toner circulation allows the toner to be made into a uniform thin layer. It becomes easier.

次に、木兄ψ」の更に他の実施例についＣ１第８図に基
いて説明する。なお、第６図又は第７図の場合と同一物
には同一符号を付し°Ｃ説明を省略する。本実施列は、
第７図の磁石１６の替りに磁石１８を設置したものであ
り、磁極１６ａの替りに２個の同極性（図示例はＳ極）
の磁極１８ａ及び１８ｂを配設したものである。同極性
の２個の磁極ｉｓａ及び１８ｂは、ブレード１３がトナ
ー担持体６と摺接する摺接位置（グレード１３の先端位
″直）を挾んでその両側に適長離隔するように対設され
ており、従って、ブレード１３の先ｖ！Ａｆ位置が同極
性の磁極１８ａ及び１８ｂの中間になるようＫｍ極１８
ａ及び１８ｂを設置し゛〔ある。本実施例においても、
第７図に示す実施例と同様の効果を奏することは勿論で
ある。Next, still another embodiment of "Ki-ni ψ" will be explained based on FIG. 8 of C1. Components that are the same as those in FIG. 6 or FIG. 7 are given the same reference numerals, and explanations thereof will be omitted. This implementation sequence is
A magnet 18 is installed instead of the magnet 16 in FIG. 7, and two magnets of the same polarity (the illustrated example is an S pole) are used instead of the magnetic pole 16a.
magnetic poles 18a and 18b are arranged. The two magnetic poles isa and 18b of the same polarity are arranged oppositely on both sides of the sliding contact position where the blade 13 makes sliding contact with the toner carrier 6 (directly at the tip of the grade 13) with an appropriate distance between them. Therefore, the Km pole 18 is set so that the tip v!Af of the blade 13 is located between the magnetic poles 18a and 18b of the same polarity.
A and 18b are installed. Also in this example,
It goes without saying that the same effects as the embodiment shown in FIG. 7 can be achieved.

なお、上記各実施し０におい゛〔は、ブレード１３の先
端部にてトナー担持体６の周面に摺接するようにブレー
ド１３を設置したが、上記各実施例の９（１＜、トナー
担持体６の周面をトナーの粒径程度の凹凸を有する粗面
に加工し、弾性を有する両性体ブレード１３を所−カウ
ンタ配置した場合１こは、ブレード１３の摺接点とブレ
ード１３の先端とのａｔ置量関係かなり広■・１）囲で
変動させても安だ的にトナーの＃１層を形成することが
できる。In each of the above embodiments 0, the blade 13 was installed so that the tip of the blade 13 was in sliding contact with the circumferential surface of the toner carrier 6, but in each of the above embodiments 9 (1<, the toner carrier In the case where the circumferential surface of the body 6 is processed to have a rough surface with irregularities comparable to the particle size of toner, and the elastic amphoteric blade 13 is placed in a counter position, the sliding contact point of the blade 13 and the tip of the blade 13 The #1 layer of toner can be formed inexpensively even if the amount of at is varied within a fairly wide range.

第９図に示す如く、ブレード１３の先端がトナー担持体
６の周面に摺接する場合のブレード１３の支持点を原点
Ｏとし、原点０からその摺接位置におけるトナー担持体
６の周面の法線方向にＸ軸ケとり、また原点Ｏから接線
方向下方にｙ軸をとつＣ１ブレード１３の位置とトナー
担持体６による感光体１４（第１１図参照）へのトナー
供給量との関係をＡｆした結果、第１０図のグラフに示
す関係が得られた。図から明らかな如く、ｘが０乃至３
ｍｍ、ｙが一４ｎ乃至−２１１１１（７）範囲におい°
〔、トナー供給量が安定している。従っ°ｃ１ブレード
１３の設置を固定的とせず、若干の位置調整を可能に設
置する仁とにより、トナー供給蓋を常に所定直にが定、
的に維持することができる。第１１１哄グレード１３の
位置１４ｍが町［Ｊじな現隊装置の１実施例を示す模式
図である。アーム１９が支点１９ａを中心として若干の
揺動が可能に設けられており、磁性体ブレード１３がア
ーム１９の先端にその長手方向をアーム１９の長手方向
に略直交させて取付けられ”Ｃいる。このように、アー
ム１９の揺動位置の調整により、ブレード１３をトナー
担持体６の周面に対して位置調整（図示例は、ｙ軸方向
の位置調整）が可能に設置することによつ°Ｃ１ブレー
ド１３の先端を一４≦ｙ≦−２の範囲内に容易に位置せ
しめることができ、従つ゛〔、感光体１４へのトナー供
給蓋を安定化することができる。なお、このトナー供給
量の安定化は、トナー担持体６内に設置される磁石２０
を回転させた場合であっても、固定設置した場合と同様
の効果を奏する。例えば、トナー担持体、６の回転数が
２４Ｏｒ、　ｐ、＋ｎ、磁石２０の回転数が１８０゜ｒ
、ｐ、Ｉｎ、である場合に１　ブレード１３の先端を一
４≦ｙ≦−２の範囲に調整することによってトノ〜−を
安定的に供和することができた。As shown in FIG. 9, the support point of the blade 13 when the tip of the blade 13 is in sliding contact with the circumferential surface of the toner carrier 6 is defined as the origin O, and the circumferential surface of the toner carrier 6 from the origin 0 to the sliding contact position is The relationship between the position of the C1 blade 13, with the X-axis in the normal direction and the y-axis in the tangential direction downward from the origin O, and the amount of toner supplied by the toner carrier 6 to the photoreceptor 14 (see FIG. 11). As a result of Af, the relationship shown in the graph of FIG. 10 was obtained. As is clear from the figure, x is 0 to 3
mm, y is in the range of 14n to -21111(7) °
[The toner supply amount is stable. Therefore, by not installing the c1 blade 13 in a fixed manner, but by installing it so that the position can be adjusted slightly, the toner supply lid can always be kept in a predetermined position.
can be maintained. The 111th Grade 13 is located 14m above the town [This is a schematic diagram showing one example of the current unit equipment. An arm 19 is provided to be able to swing slightly about a fulcrum 19a, and a magnetic blade 13 is attached to the tip of the arm 19 with its longitudinal direction substantially perpendicular to the longitudinal direction of the arm 19. In this way, by adjusting the swinging position of the arm 19, the position of the blade 13 can be adjusted relative to the circumferential surface of the toner carrier 6 (in the illustrated example, the position in the y-axis direction) can be adjusted. The tip of the C1 blade 13 can be easily positioned within the range of -4≦y≦-2, and therefore the toner supply lid to the photoreceptor 14 can be stabilized. The supply amount is stabilized by a magnet 20 installed inside the toner carrier 6.
Even when it is rotated, the same effect as when it is fixedly installed is achieved. For example, the rotation speed of the toner carrier 6 is 24 Or, p, +n, and the rotation speed of the magnet 20 is 180°.
, p, In, 1 By adjusting the tip of the blade 13 within the range of -4≦y≦-2, it was possible to stably accommodate the tonneau.

以上詳細に説明した如く、本発明による場合は、磁性体
ブレードの先端位置とトナー担持体に内設された磁石の
磁極との配置間１糸を適切に設層することによって、ブ
レードの圧接力が軽減さｙするから、トナー担持体の周
面又はグレードへのトナーの固着が回避さ扛、像担体へ
のトナー供給量を商値に維持することができ、また、長
期１ｂ’ｌに亘って均一な薄厚のトナ一層をトナー担持
体表面に形成することができる。なお、木兄ｕＡは上記
の特定の実施例に限定されるべきものではなく、本発明
の技術的範囲内におい゛Ｃ柚々の変形がｕｆ而であるこ
とは／／Ｊ論である。As explained in detail above, in the case of the present invention, by appropriately layering a thread between the tip position of the magnetic blade and the magnetic pole of the magnet installed inside the toner carrier, the pressure contact force of the blade is Since the toner is reduced, adhesion of the toner to the peripheral surface or grade of the toner carrier is avoided, the amount of toner supplied to the image carrier can be maintained at the commercial value, and it is possible to maintain the amount of toner supplied to the image carrier at a commercial value. A uniform thin toner layer can be formed on the surface of the toner carrier. It should be noted that the UA should not be limited to the above-mentioned specific embodiment, and it is a matter of course that various modifications of the C and U are possible within the technical scope of the present invention.

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

第１図は磁極２とグレード３との配置関係をボす模式図
、第２図は磁極２０回転の有無とトナー供給量との関係
を赤す模式図、第３図はθとトナー供給量との関係を示
すグラフ、第４図は磁石４の磁界を示す説明図、第５図
は磁石４の磁極部４ａ及び４ｂとブレード３との配置関
係を示す説明図、第６図は本発明の１実施例を示す模式
図、第７図は本発明の曲の実施例を示す模式図、第８図
は本発明の更に他の実施例を示す模式図、第９図はブレ
ード日の位置調歪の説明図、第１０図りまブレード１３
の支持点とトナー供給量との関係を示すグラフ、第１１
図は現１域装置の模式図である。 （符号の説明） ６：トナー担持体　１０．１６．１８．２０　：磁石１
０ａ、　ｌＯｂ、　ｔ６ａ＋　１６ｂ、　１６Ｃ，１６
ｄ、　１８ａ、　１８ｂ　：磁極１３ニゲレード　　　
１４：感光体 特許出願人　　株式会社　リ　コ　− 第１図 どσ 第２図 経過時間（分） 第３図 θ　（度） 第４図 第５図 第６図 第７図 第８図 第９図 第１０図 ｙ方向位置（ｆｌ、　）Figure 1 is a schematic diagram showing the arrangement relationship between magnetic pole 2 and grade 3, Figure 2 is a schematic diagram showing the relationship between the presence or absence of 20 rotations of the magnetic pole and toner supply amount, and Figure 3 is θ and toner supply amount. FIG. 4 is an explanatory diagram showing the magnetic field of the magnet 4, FIG. 5 is an explanatory diagram showing the arrangement relationship between the magnetic pole parts 4a and 4b of the magnet 4 and the blade 3, and FIG. FIG. 7 is a schematic diagram showing an embodiment of the song of the present invention. FIG. 8 is a schematic diagram showing still another embodiment of the present invention. FIG. 9 is a schematic diagram showing the position of the blade date. Explanatory diagram of adjustment distortion, 10th diagram Rima blade 13
Graph showing the relationship between the support point and the toner supply amount, No. 11
The figure is a schematic diagram of the current 1-area device. (Explanation of symbols) 6: Toner carrier 10.16.18.20: Magnet 1
0a, lOb, t6a+ 16b, 16C, 16
d, 18a, 18b: magnetic pole 13 nigerade
14: Photoreceptor patent applicant Ricoh Co., Ltd. - Figure 1 Doσ Figure 2 Elapsed time (minutes) Figure 3 θ (degrees) Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Fig. 10 y direction position (fl, )

Claims (1)

【特許請求の範囲】 ■、　静′ｋＬ潜像が形成された像担体の表面にトナー
を供給して可視像化する現像装置におい−Ｃ１スリーブ
状又は無端ベルト状をなし前記像担体の近傍をその通過
域とするように移動可能に設けられたトナー担持体と、
該トナー担持体の表面にトナーを補給するトナー補給手
段と、前記トナー担持体の移動方向における前記トナー
補給手段の下流側に配設され前記トナー担持体の表面に
摺接するように設けられた磁性体材料からなるブレード
と、前記トナー担持体の通過域内側にその移動方向に旧
って相互ｅこ適長１…隔をおいて配設された複数個の磁
極とを有し、該磁極はその中で隣接する１対の磁極間に
対応する位置に前記ブレードの先端が位置するように配
役したことを特徴とする現像装置。 ２、上記第１項においＣ，＋＜：Ｉ記ブレードの先端の
前後両側に配設された磁極に同極性であることを％徴と
する現像装置。 ３、上記第２項におい゛Ｃ１前記ブレードの先端の近傍
に断面略Ｕ字型の磁石を−むの両端の磁極部が前記ブレ
ードの先端の前後両側になるように配設したことを特徴
とする現像装置。 ４、上記第１項におい°Ｃ１前記ブレードの先端の前後
両側に配設された磁極は異極性であることを特徴とする
現像装置。[Scope of Claims] (2) In a developing device that supplies toner to the surface of an image carrier on which a static latent image is formed to form a visible image - C1 in the form of a sleeve or an endless belt and in the vicinity of the image carrier; a toner carrier that is movably provided so that the passing region is a toner carrier;
a toner replenishing means for replenishing toner onto the surface of the toner carrier; and a magnetic member disposed downstream of the toner replenishing means in the moving direction of the toner carrier so as to be in sliding contact with the surface of the toner carrier. a plurality of magnetic poles disposed inside the passage area of the toner carrier at an appropriate distance from each other in the direction of movement; A developing device characterized in that the tip of the blade is positioned at a position corresponding to between a pair of adjacent magnetic poles. 2. A developing device according to the above item 1, characterized in that the magnetic poles disposed on both front and rear sides of the tip of the blade have the same polarity. 3. In the above item 2, C1 is characterized in that a magnet having a substantially U-shaped cross section is disposed near the tip of the blade so that magnetic pole portions at both ends thereof are on both front and rear sides of the tip of the blade. developing device. 4. The developing device according to item 1 above, characterized in that the magnetic poles disposed on both front and rear sides of the tip of the blade have different polarities.