JPH11149213A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPH11149213A JPH11149213A JP33097997A JP33097997A JPH11149213A JP H11149213 A JPH11149213 A JP H11149213A JP 33097997 A JP33097997 A JP 33097997A JP 33097997 A JP33097997 A JP 33097997A JP H11149213 A JPH11149213 A JP H11149213A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- toner
- roller
- developing device
- supply
- 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.)
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Links
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- Dry Development In Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、複写機、ファクシミ
リ、プリンター等の画像形成装置に用いられる現像装置
に係り、詳しくは、現像剤担持体表面と現像剤供給部材
表面との間に間隙を有する現像装置における現像剤への
帯電付与手段の改良に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device used for an image forming apparatus such as a copying machine, a facsimile, a printer, etc., and more particularly, to a developing device in which a gap is provided between the surface of a developer carrier and the surface of a developer supply member. To improve the means for imparting charge to a developer in a developing device having the same.
【０００２】[0002]
【従来の技術】複写機、ファクシミリ、プリンター等の
画像形成装置に用いられる現像装置には、例えば、現像
剤担持体の表面に担持された現像剤を画像形成装置の像
担持体上に付着させることで、該像担持体の表面に形成
された潜像を現像するものがある。2. Description of the Related Art In a developing device used in an image forming apparatus such as a copying machine, a facsimile, a printer, etc., for example, a developer carried on a surface of a developer carrying member is adhered to an image carrying member of the image forming device. In some cases, the latent image formed on the surface of the image carrier is developed.
【０００３】この種の現像装置としては、トナー収容器
に収容された現像剤としての非磁性１成分トナー（以
下、単にトナーと称する）を、現像剤供給部材によって
汲み上げ、該現像剤供給部材と現像剤担持体との当接部
で摩擦帯電させるとともに該現像剤担持体の表面に担持
した後、該現像剤担持体と対向配置された像担持体の潜
像に選択的に付着させることで、該潜像を現像する非磁
性１成分現像装置が知られている。In this type of developing device, a non-magnetic one-component toner (hereinafter, simply referred to as toner) as a developer contained in a toner container is pumped up by a developer supply member, and the developer supply member is connected to the toner supply member. After being triboelectrically charged at the contact portion with the developer carrier and carried on the surface of the developer carrier, the toner is selectively adhered to the latent image of the image carrier arranged opposite to the developer carrier. A non-magnetic one-component developing device for developing the latent image is known.
【０００４】図１は非磁性１成分現像装置の一例を概略
構成図で示したものである。図１において、トナー収容
器６に収容されたトナー５は、図示を省略した駆動によ
り回転される撹拌部材としてのアジテータ７によって、
現像剤供給部材としての供給ローラ３の表面に搬送され
る。発泡弾性体からなり、図示を省略した駆動により半
時計回りに回転される供給ローラ３は、その表面にトナ
ー５を付着させて現像剤担持体としての現像ローラ２と
の当接部に搬送する。このようにして当接部に搬送され
たトナー５は、現像ローラ２と供給ローラ３とに挟まれ
て摩擦されることにより帯電され、現像ローラ２に担持
される。現像ローラ２に担持されたトナー５は、規制部
材としての薄層化ブレード４と現像ローラ２との間に挟
まれることで薄層化され、像担持体としての感光体ドラ
ム１表面の静電潜像に選択的に付着される。FIG. 1 is a schematic diagram showing an example of a non-magnetic one-component developing device. In FIG. 1, the toner 5 stored in the toner container 6 is moved by an agitator 7 as a stirring member that is rotated by driving (not shown).
The developer is conveyed to the surface of a supply roller 3 as a developer supply member. The supply roller 3, which is made of a foamed elastic body and is rotated counterclockwise by a drive not shown, causes the toner 5 to adhere to the surface of the supply roller 3 and transports the toner 5 to a contact portion with the developing roller 2 as a developer carrier. . The toner 5 thus conveyed to the contact portion is charged by being rubbed between the developing roller 2 and the supply roller 3 and is charged by the developing roller 2. The toner 5 carried on the developing roller 2 is thinned by being sandwiched between the thinning blade 4 as a regulating member and the developing roller 2, and the electrostatic charge on the surface of the photosensitive drum 1 as an image carrier is reduced. It is selectively attached to the latent image.
【０００５】このような構成の非磁性１成分現像装置や
該非磁性１成分現像装置を用いる画像形成方法として
は、例えば、特開平８−１０６２１８号公報の非磁性１
成分現像装置や特開平７ー２９５３６３号公報の画像形
成方法がある。A non-magnetic one-component developing device having such a configuration and an image forming method using the non-magnetic one-component developing device are described in, for example, Japanese Patent Application Laid-Open No. 8-106218.
There is a component developing apparatus and an image forming method disclosed in JP-A-7-295363.
【０００６】特開平８−１０６２１８号公報の非磁性１
成分現像装置は、発砲弾性体からなり、１５〜３０
［°］のアスカーＣ硬度を有する供給ローラと、現像ロ
ーラと、アジテータと、薄層化ブレードとを備え、且
つ、該現像ローラと該供給ローラとの当接部における喰
い込み深さを、０．３［ｍｍ］以下とするものである。
この現像装置によれば、トナーの摩擦帯電を良好に行う
ことができる。さらに、上記当接部におけるトナーへの
ストレスを少なくするので、該トナーの劣化を防止する
ことができる。[0006] Non-magnetic 1 disclosed in JP-A-8-106218
The component developing device is made of a foamed elastic body, and
A supply roller having an Asker C hardness of [°], a developing roller, an agitator, and a thinning blade, and a biting depth at a contact portion between the developing roller and the supply roller is set to 0. 0.3 [mm] or less.
According to this developing device, it is possible to satisfactorily perform the triboelectric charging of the toner. Further, since the stress on the toner at the contact portion is reduced, the deterioration of the toner can be prevented.
【０００７】また、特開平７ー２９５３６３号公報の画
像形成方法は、外添剤として重量平均粒径が０．０１〜
０．２［μｍ］であり、疎水化度が４０〜９０［％］で
あり、且つ、４００［ｎｍ］における光透過率が４０
［％］以上である酸化チタン粒子を含有するトナーを用
い、現像ローラと単泡性発泡体ゴムからなる供給ローラ
との当接部においる喰い込み深さを２．０〜６．０［ｍ
ｍ］とする画像形成方法である。この画像形成方法によ
れば、トナーの摩擦帯電を良好に行うことができる。さ
らに、上記当接部におけるトナーへのストレスを少なく
するので、該トナーの劣化を防止することができる。In the image forming method disclosed in Japanese Patent Application Laid-Open No. 7-295363, the weight average particle diameter of the external additive is from 0.01 to 0.01.
0.2 [μm], the degree of hydrophobicity is 40 to 90 [%], and the light transmittance at 400 [nm] is 40 [%].
Using a toner containing titanium oxide particles of not less than [%], the biting depth at the contact portion between the developing roller and the supply roller made of a single-cell foamed rubber is 2.0 to 6.0 [%]. m
m]. According to this image forming method, frictional charging of the toner can be favorably performed. Further, since the stress on the toner at the contact portion is reduced, the deterioration of the toner can be prevented.
【０００８】しかしながら、このように、現像ローラと
供給ローラとを、喰い込ませ又は接触させている非磁性
１成分現像装置においては、次に掲げる４つの不具合が
ある。However, in the non-magnetic one-component developing device in which the developing roller and the supply roller are bitten or brought into contact with each other, there are the following four problems.
【０００９】第１の不具合は、現像ローラを変形や摩耗
等によって劣化させてしまうことである。現像ローラの
劣化は、供給ローラから圧力を受けながら長期間運転さ
れることによって生ずる。The first problem is that the developing roller is deteriorated due to deformation, wear and the like. The deterioration of the developing roller is caused by operating for a long time while receiving pressure from the supply roller.
【００１０】第２の不具合は、現像ローラの表面に形成
されるトナー薄層に、濃度ムラや厚みムラを発生させて
しまうことである。図２は現像ローラと供給ローラとの
当接部を拡大した断面図である。図に示すように、発泡
弾性体からなる供給ローラは多数のセルを有するので、
セル部（図中のｂ部）と非セル部（図中のａ部）とで
は、現像ローラとの当接圧力を異にする。つまり、供給
ローラのセル部と非セル部とでは、現像ローラとの当接
圧力に差がある。この当接圧力の差は、現像ローラと供
給ローラとの当接部におけるトナー帯電量及びトナー付
着量を不均一化させて、該現像ローラと薄層化ブレード
との当接部で濃度や厚みの不均一なトナー薄層を形成さ
せる。即ち、現像ローラ表面のトナー薄層の濃度ムラや
厚みムラは、供給ローラのセル部と非セル部とにおい
て、現像ローラとの当接圧力に差が生ずることによって
発生される。厚みの不均一なトナー薄層が像担持体との
対向部に搬送されると、該像担持体の静電潜像に付着さ
せるトナーの量を変化させてしまうので、形成画像に濃
度ムラを発生させてしまう。A second problem is that density unevenness and thickness unevenness occur in the thin toner layer formed on the surface of the developing roller. FIG. 2 is an enlarged sectional view of the contact portion between the developing roller and the supply roller. As shown in the figure, the supply roller made of a foamed elastic body has many cells,
The contact pressure with the developing roller is different between the cell portion (portion b in the drawing) and the non-cell portion (portion a in the drawing). That is, there is a difference in the contact pressure with the developing roller between the cell part and the non-cell part of the supply roller. This difference in contact pressure causes the amount of toner charge and the amount of toner adhered to the contact portion between the developing roller and the supply roller to become non-uniform, and the density and thickness at the contact portion between the developing roller and the thinning blade. To form a non-uniform toner thin layer. That is, the density unevenness and the thickness unevenness of the thin toner layer on the surface of the developing roller are caused by the difference in the contact pressure with the developing roller between the cell part and the non-cell part of the supply roller. When a thin toner layer having an uneven thickness is conveyed to a portion facing the image carrier, the amount of toner adhered to the electrostatic latent image on the image carrier is changed. Cause it to occur.
【００１１】第３の不具合は、現像ローラの駆動トルク
を増大させてしまうことである。現像ローラを供給ロー
ラに喰い込ませると、該現像ローラと該供給ローラとの
摩擦抵抗を増大させてしまうので、現像ローラの駆動ト
ルクを増大させてしまう。つまり、現像ローラの駆動ト
ルクの増大は、現像ローラが供給ローラに喰い込むこと
によって発生される。A third problem is that the driving torque of the developing roller is increased. If the developing roller is bitten by the supply roller, the frictional resistance between the developing roller and the supply roller increases, so that the driving torque of the developing roller increases. That is, the increase in the driving torque of the developing roller is caused by the developing roller biting into the supply roller.
【００１２】第４の不具合は、形成画像に濃淡差として
のバンディングを発生させてしまうことである。発泡弾
性体からなる供給ローラは変形され易く、現像ローラと
の当接部に挟み込むトナーの量を変化させるので、該供
給ローラと該現像ローラとの摩擦抵抗を変化させて該現
像ローラに回転ムラを生じさせる。現像ローラに回転ム
ラが生ずると、形成画像には濃淡差が生じてしまう。つ
まり、形成画像のバンディングは、供給ローラと現像ロ
ーラとの当接部に挟まれるトナー量の変化によって生ず
る。A fourth problem is that banding occurs as a difference in shading in a formed image. The supply roller made of a foamed elastic body is easily deformed, and changes the amount of toner sandwiched in the contact portion with the development roller. Therefore, the frictional resistance between the supply roller and the development roller is changed to cause uneven rotation of the development roller. Cause. If rotation unevenness occurs in the developing roller, a shading difference occurs in the formed image. That is, banding of the formed image is caused by a change in the amount of toner sandwiched between the contact portions between the supply roller and the developing roller.
【００１３】一方、非磁性１成分現像装置を用いる画像
形成装置としては、特開平７−２３４５８３号公報に記
載のものがある。On the other hand, as an image forming apparatus using a non-magnetic one-component developing device, there is one described in Japanese Patent Application Laid-Open No. Hei 7-234583.
【００１４】この画像形成装置に用いられる非磁性１成
分現像装置は、硬質材料からなる供給ローラの表面と現
像ローラの表面とを０．０２〜２［ｍｍ］離間させ、且
つ、トナーの摩擦帯電を助長する材料からなる薄層化ブ
レードを該現像ローラの表面に当接させたものである。
この非磁性１成分現像装置によれば、現像ローラの表面
と供給ローラの表面とを離間させているので、上記４つ
の不具合を全て解消することができる。The non-magnetic one-component developing device used in this image forming apparatus separates the surface of the supply roller made of hard material from the surface of the developing roller by 0.02 to 2 [mm], and frictionally charges the toner. In this case, a thinning blade made of a material which promotes the development is brought into contact with the surface of the developing roller.
According to the non-magnetic one-component developing device, since the surface of the developing roller and the surface of the supply roller are separated from each other, all of the above four problems can be solved.
【００１５】[0015]
【発明が解決しようとする課題】しかしながら、この非
磁性１成分現像装置は、現像ローラに担持されるトナー
の帯電量を不足させる恐れがある。即ち、この非磁性１
成分現像装置は、現像ローラと供給ローラとを当接させ
ていないので、該現像ローラと該供給ローラとの間でト
ナーを摩擦帯電させることができない。このため、薄層
化ブレードにトナーの摩擦帯電を助長する材料を用いる
ことにより、該薄層化ブレードと現像ローラとの当接部
でトナーを摩擦帯電させている。しかし、従来、現像装
置に薄層化ブレードを設けることの主なる目的は、現像
ローラの表面に形成されるトナー薄層の層厚の均一化に
あり、該薄層化ブレードによるトナーの摩擦帯電は、あ
くまでも、別途に設けられた手段によって帯電されたト
ナーの帯電量を補強するものである。従って、トナーの
摩擦帯電を薄層化ブレードのみに依存させると、単位時
間当たりのトナーの帯電量を減少させるので、トナー消
費量の多い画像を形成させたときに、トナーの帯電量を
不足させる恐れがある。However, in this non-magnetic one-component developing device, there is a possibility that the amount of charge of the toner carried on the developing roller becomes insufficient. That is, this nonmagnetic 1
In the component developing device, since the developing roller and the supply roller are not in contact with each other, the toner cannot be frictionally charged between the developing roller and the supply roller. Therefore, by using a material that promotes frictional charging of the toner for the thinning blade, the toner is frictionally charged at the contact portion between the thinning blade and the developing roller. However, conventionally, the main purpose of providing a thinning blade in a developing device is to make the thickness of a thin toner layer formed on the surface of a developing roller uniform, and the triboelectric charging of toner by the thinning blade is performed. Is to reinforce the charge amount of the toner charged by means provided separately. Therefore, if the triboelectric charge of the toner depends only on the thinning blade, the amount of charge of the toner per unit time is reduced, so that the amount of charge of the toner becomes insufficient when an image with large toner consumption is formed. There is fear.
【００１６】また、この非磁性１成分現像装置において
は、現像ローラに担持されるトナーの量を不足させる恐
れがある。即ち、従来の非磁性１成分現像装置において
は、供給ローラは摩擦されることによって、トナーの担
持を助長されている。このため、供給ローラを摩擦させ
ないと、該供給ローラに担持されるトナーの量を減少さ
せるとともに該供給ローラから現像ローラへのトナーの
供給量を減少させてしまうので、トナー消費量の多い画
像を形成させたときに、該現像ローラに担持されるトナ
ーの量を不足させる恐れがある。In this non-magnetic one-component developing device, there is a possibility that the amount of toner carried on the developing roller becomes insufficient. That is, in the conventional non-magnetic one-component developing device, the supply roller is rubbed to promote the toner carrying. Therefore, if the supply roller is not rubbed, the amount of toner carried on the supply roller is reduced, and the amount of toner supplied from the supply roller to the developing roller is reduced. When formed, the amount of toner carried on the developing roller may be insufficient.
【００１７】そこで、本発明は、以上の問題点に鑑みな
されたものであり、その目的とするところは、現像剤担
持体の表面と現像剤供給部材の表面とを離間させた現像
装置において、該現像剤担持体に担持される現像剤の帯
電量及び剤量を不足させない現像装置を提供することで
ある。Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a developing apparatus in which the surface of a developer carrier and the surface of a developer supply member are separated from each other. It is an object of the present invention to provide a developing device which does not make the charge amount and developer amount of the developer carried on the developer carrying member insufficient.
【００１８】[0018]
【課題を解決するための手段】上記の目的を達成するた
めに、請求項１の発明は、現像剤を収容する現像剤収容
器と、表面に担持した現像剤で像担持体上の静電潜像を
現像する現像剤担持体と、表面が所定の方向に移動する
ように駆動され、該現像剤収容器に収容される現像剤を
該表面に担持して該現像剤担持体に供給する現像剤供給
部材とを有し、該現像剤担持体の表面と該現像剤供給部
材の表面とが離間している現像装置において、該現像剤
供給部材の表面と該現像剤収容器の内面とを接触させ、
且つ、該現像剤供給部材の表面に担持される現像剤を該
現像剤担持体の表面に接触させたことを特徴とするもの
である。In order to achieve the above-mentioned object, the present invention is directed to a developer container for housing a developer, and a developer on the surface of the image carrier with the developer carried on the surface. A developer carrier for developing the latent image, and a surface driven to move in a predetermined direction, carrying the developer contained in the developer container on the surface and supplying the developer to the developer carrier A developing device having a developer supply member, wherein a surface of the developer carrier and a surface of the developer supply member are separated from each other, wherein the surface of the developer supply member and the inner surface of the developer container are Contact
Further, the developer carried on the surface of the developer supply member is brought into contact with the surface of the developer carrier.
【００１９】請求項１の発明においては、上記現像剤供
給部材の表面を上記現像剤収容器の内面との接触部で摩
擦させることにより、該表面における現像剤の担持を助
長させる。この結果、充分量の現像剤を上記現像剤供給
部材の表面に担持させる。また、上記現像剤供給部材の
表面に担持された現像剤は、該表面と上記現像剤収容器
の内面との接触部で挟まれて摩擦帯電される。このよう
に摩擦帯電された現像剤は、上記現像剤供給部材の移動
によって上記現像剤担持体との対向部に搬送され、該現
像剤担持体の表面と接触して更に摩擦帯電されるととも
に該現像剤担持体に担持される。According to the first aspect of the present invention, the surface of the developer supply member is rubbed at a contact portion with the inner surface of the developer container, thereby promoting the loading of the developer on the surface. As a result, a sufficient amount of the developer is carried on the surface of the developer supply member. Further, the developer carried on the surface of the developer supply member is frictionally charged by being sandwiched by a contact portion between the surface and the inner surface of the developer container. The developer triboelectrically charged in this way is conveyed to the portion facing the developer carrier by the movement of the developer supply member, and is further triboelectrically charged while contacting the surface of the developer carrier. It is carried on a developer carrier.
【００２０】請求項２の発明は、請求項１の現像装置に
おいて、上記現像剤担持体と上記現像剤供給部材との表
面に電位差を設けたことを特徴とすることを特徴とする
ものである。According to a second aspect of the present invention, in the developing device of the first aspect, a potential difference is provided on the surfaces of the developer carrier and the developer supply member. .
【００２１】請求項２の発明においては、上記現像剤供
給部材に担持された現像剤は、上記現像剤担持体の表面
との対向部で、該表面と該現像剤供給部材の表面との電
位差によって電気的な力が付与される。この結果、上記
現像剤供給部材の表面に担持された現像剤の上記現像剤
担持体の表面への移動が助長される。According to the second aspect of the present invention, the developer carried on the developer supply member is provided with a potential difference between the surface and the surface of the developer supply member at a portion facing the surface of the developer carrier. Provides an electrical force. As a result, the movement of the developer carried on the surface of the developer supply member to the surface of the developer carrier is promoted.
【００２２】請求項３の発明は、現像剤を収容する現像
剤収容器と、表面に担持した現像剤で像担持体上の静電
潜像を現像する現像剤担持体と、表面が所定の方向に移
動するように駆動され、該現像剤収容器に収容される現
像剤を該表面に担持して該現像剤担持体に供給する現像
剤供給部材とを有し、該現像剤担持体の表面と該現像剤
供給部材の表面とが離間している現像装置において、該
現像剤供給部材の表面と該現像剤収容器の内面とを接触
させ、且つ、該現像剤供給部材の表面に担持される現像
剤と該現像剤担持体の表面とを離間させるとともに両表
面に電位差を設けたことを特徴とすることを特徴とする
ものである。According to a third aspect of the present invention, there is provided a developer container for storing a developer, a developer carrier for developing an electrostatic latent image on the image carrier with the developer carried on the surface, and a developer carrier having a predetermined surface. A developer supply member that is driven to move in the direction, and carries the developer contained in the developer container on the surface and supplies the developer to the developer carrier. In a developing device in which the surface and the surface of the developer supply member are separated from each other, the surface of the developer supply member and the inner surface of the developer container are brought into contact with each other, and the developer is carried on the surface of the developer supply member. The developer is separated from the surface of the developer carrier, and a potential difference is provided between both surfaces.
【００２３】請求項３の発明においては、上記現像剤供
給部材の表面を上記現像剤収容器の内面との接触部で摩
擦させることにより、該表面における現像剤の担持を助
長させる。この結果、充分量の現像剤を上記現像剤供給
部材に担持させる。また、上記現像剤供給部材の表面に
担持された現像剤は、該表面と上記現像剤収容器の内面
との接触部で挟まれて摩擦帯電される。このように摩擦
帯電された現像剤は、上記現像剤供給部材の表面の移動
によって上記現像剤担持体との対向部に搬送され、該対
向部において該表面と該現像剤担持体の表面との電位差
によって電気的な力が付与される。そして、上記対向部
で電気的な力が付与された現像剤は、現像剤供給部材の
表面から飛翔して上記現像剤担持体に担持される。な
お、上記対向部において、充分に帯電されていない現像
剤は、付与される電気的な力が弱いので飛翔しない。ま
た、正規の極性に帯電されていない現像剤には、現像ロ
ーラと反発する電気的力を付与される。According to the third aspect of the present invention, the surface of the developer supply member is rubbed at a portion in contact with the inner surface of the developer container, thereby promoting the loading of the developer on the surface. As a result, a sufficient amount of the developer is carried on the developer supply member. Further, the developer carried on the surface of the developer supply member is frictionally charged by being sandwiched by a contact portion between the surface and the inner surface of the developer container. The developer triboelectrically charged in this manner is conveyed to a portion facing the developer carrier by the movement of the surface of the developer supply member, and the surface and the surface of the developer carrier at the facing portion. An electric force is applied by the potential difference. Then, the developer to which the electric force has been applied at the facing portion flies from the surface of the developer supply member and is carried on the developer carrying member. It should be noted that the developer that is not sufficiently charged in the opposed portion does not fly because the applied electric force is weak. Further, an electric force that repels the developing roller is applied to the developer that is not charged to the regular polarity.
【００２４】請求項４の発明は、請求項１、２又は３の
現像装置において、上記現像剤供給部材の表面と上記現
像剤収容部の内面との接触位置を、該表面と上記現像剤
担持体の表面との間における現像剤の供給位置の近傍
で、且つ、該供給位置よりも上記方向の下流側に配置し
たことを特徴とするものである。According to a fourth aspect of the present invention, in the developing device of the first, second, or third aspect, the contact position between the surface of the developer supply member and the inner surface of the developer accommodating portion is determined. It is characterized in that it is arranged in the vicinity of a developer supply position between itself and the surface of the body and downstream of the supply position in the above-mentioned direction.
【００２５】請求項４の発明においては、上記現像剤供
給部材の表面に担持された現像剤のうち、過剰に担持さ
れた現像剤は該表面と上記現像剤収容器の内面との接触
部に進入する際に掻き落とされる。また、この接触部
を、上記現像剤供給部材の表面と上記現像剤担持体の表
面との間における現像剤の供給位置の近傍で、且つ、該
供給位置よりも該現像剤供給部材の移動方向下流側に設
けることで、該接触部から該供給位置まで移動される間
の該現像剤供給部材の表面に、新たな現像剤を担持させ
ない。これらの結果、上記現像剤供給部材は上記現像剤
担持体に過剰な現像剤を供給しない。According to the fourth aspect of the present invention, of the developer carried on the surface of the developer supply member, an excessively carried developer is provided at a contact portion between the surface and the inner surface of the developer container. They are scraped off when they enter. Further, the contact portion is located near the developer supply position between the surface of the developer supply member and the surface of the developer carrier, and in the moving direction of the developer supply member more than the supply position. By providing the developer on the downstream side, new developer is not carried on the surface of the developer supply member during the movement from the contact portion to the supply position. As a result, the developer supply member does not supply excessive developer to the developer carrier.
【００２６】請求項５の発明は、請求項４の１成分現像
装置において、上記現像剤供給部材を発泡弾性体からな
る材料で構成したことを特徴とすることを特徴とするも
のである。According to a fifth aspect of the present invention, in the one-component developing device of the fourth aspect, the developer supply member is made of a material made of a foamed elastic material.
【００２７】請求項５の発明においては、上記現像剤供
給部材を発泡弾性体からなる材料で構成することで、該
現像剤供給部材と上記現像剤収容器との喰い込み量を増
加させるとともに両者の摩擦抵抗を増加させることがで
きる。In the fifth aspect of the present invention, the developer supply member is made of a material made of a foamed elastic material, so that the amount of bite between the developer supply member and the developer container is increased, and both the developer supply member and the developer container are increased. Friction resistance can be increased.
【００２８】請求項６の発明は、請求項４の１成分現像
装置において、現像剤の摩擦帯電を助長する材料からな
り、上記現像剤担持体に当接することで、該現像剤担持
体に担持される現像剤の層厚を規制する規制部材を設け
たことを特徴とすることを特徴とするものである。According to a sixth aspect of the present invention, in the one-component developing device of the fourth aspect, the one-component developing device is made of a material that promotes triboelectric charging of the developer, and is brought into contact with the developer carrier so as to be supported on the developer carrier. The present invention is characterized in that a regulating member for regulating the layer thickness of the developer is provided.
【００２９】請求項６の発明においては、現像剤の摩擦
帯電を助長する材料からなる規制部材を上記現像剤担持
体に当接させることで、該当接の部分でも現像剤を摩擦
帯電させることができる。According to the sixth aspect of the present invention, the regulating member made of a material which promotes the triboelectric charging of the developer is brought into contact with the developer carrier, so that the developer can be triboelectrically charged even at the corresponding portion. it can.
【００３０】[0030]
【発明の実施の形態】まず、本発明を電子写真複写機の
非磁性１成分現像装置に適用した１実施形態について説
明する。図３は本実施形態に係る非磁性１成分現像装置
の概略構成図である。像担持体としての感光体ドラム１
は、図示を省略された駆動により、線速１００〜２００
［ｍｍ／sec］で時計回りに回転される。感光体ドラム
１の周囲には、電子写真プロセスを実施するために、周
知の帯電装置、露光光学系、転写分離装置、クリーニン
グ装置、除電装置（いずれも不図示）が配設されてい
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an embodiment in which the present invention is applied to a non-magnetic one-component developing device of an electrophotographic copying machine will be described. FIG. 3 is a schematic configuration diagram of the non-magnetic one-component developing device according to the present embodiment. Photoconductor drum 1 as image carrier
Are driven at a linear velocity of 100 to 200
Rotated clockwise at [mm / sec]. Around the photosensitive drum 1, a well-known charging device, an exposure optical system, a transfer separation device, a cleaning device, and a static elimination device (all not shown) are provided for performing an electrophotographic process.
【００３１】本実施形態の現像装置２０は、感光体ドラ
ム１表面に向けた開口を備え、現像剤収容器と現像装置
ケーシングとの機能を兼ねたケーシング６と、該開口か
ら表面の一部を露出し、現像ローラ駆動モータ（不図
示）によって線速１００〜２００［ｍｍ／sec］で反時
計回りに回転される現像剤担持体としての現像ローラー
２と、現像ローラ２に対して所定の間隙を保持して配置
され、図示を省略された駆動によって線速５０〜１００
［ｍｍ／sec］で反時計回りに回転される現像剤供給部
材としての供給ローラー３と、図示を省略された駆動に
より回転され、ケーシング６内のホッパー部に収容され
ている非磁性１成分現像剤としてのトナー５を供給ロー
ラー３表面に供給するとともに該ホッパー部内のトナー
５を撹拌するアジテータ７と、現像ローラ２に当接し、
現像ローラ２の表面に担持されるトナー５の薄層を形成
させる規制部材としての薄層化ブレード４とを有してい
る。The developing device 20 of the present embodiment has an opening facing the surface of the photosensitive drum 1, and has a casing 6 which also functions as a developer container and a developing device casing. A developing roller 2 as a developer carrier that is exposed and rotated counterclockwise at a linear velocity of 100 to 200 [mm / sec] by a developing roller driving motor (not shown); And a linear velocity of 50 to 100 by driving not shown.
A supply roller 3 as a developer supply member rotated counterclockwise at [mm / sec]; and a non-magnetic one-component developer rotated by a drive (not shown) and housed in a hopper portion in a casing 6. An agitator 7 for supplying the toner 5 as an agent to the surface of the supply roller 3 and agitating the toner 5 in the hopper portion;
And a thinning blade 4 as a regulating member for forming a thin layer of the toner 5 carried on the surface of the developing roller 2.
【００３２】現像ローラ２は、直径が１６［ｍｍ］で、
導電性ゴムとしてのシリコンゴムから構成されている。
現像ローラに使用される材料としては、導電性ゴムの他
に、アルミやステンレスなどの金属などがある。The developing roller 2 has a diameter of 16 [mm].
It is made of silicon rubber as conductive rubber.
Materials used for the developing roller include metals such as aluminum and stainless steel in addition to conductive rubber.
【００３３】供給ロ‐ラ２は、直径が１６［ｍｍ］で、
シリコンゴム等の弾性体から構成されている。The supply roller 2 has a diameter of 16 [mm].
It is made of an elastic material such as silicon rubber.
【００３４】薄層化ブレード４は、厚さが０．１［ｍ
ｍ］の板状に構成され、０．１〜０．３［Ｎ／ｍｍ］の
圧力で現像ローラ２と当接している。The thinning blade 4 has a thickness of 0.1 [m
m] and is in contact with the developing roller 2 at a pressure of 0.1 to 0.3 [N / mm].
【００３５】ケーシング６は、金属又は合成樹脂等から
なり、底面の一部が供給ローラ３と所定の喰い込み量で
当接されている。The casing 6 is made of metal, synthetic resin, or the like, and a part of the bottom surface is in contact with the supply roller 3 with a predetermined bite amount.
【００３６】アジテータ７は、金属又は合成樹脂等から
なり、時計回りに２０〜５０［ｒｐｍ］で回転してい
る。なお、ホッパー部の形状やトナー５の流動性によっ
ては、トナー５の自重のみでトナー５を供給ローラー５
表面に供給できる場合があるので、このような場合に
は、該ホッパー部内のトナー５を供給ローラ３に供給す
るアジテータ７を省略しても良い。 （以下、余白）The agitator 7 is made of metal, synthetic resin, or the like, and rotates clockwise at 20 to 50 [rpm]. Depending on the shape of the hopper and the fluidity of the toner 5, the toner 5 is supplied only by its own weight.
In such a case, the agitator 7 for supplying the toner 5 in the hopper to the supply roller 3 may be omitted in such a case. (Hereinafter, margin)
【００３７】以上の構成において、ケーシング６に収容
されたトナー５は、アジテータ７によって供給ローラ３
の表面に搬送される。供給ローラ３表面は、ケーシング
６内面との当接部で摩擦されることにより、搬送された
トナー５の担持を助長される結果、充分量のトナー５を
担持する。供給ローラ３表面に担持されたトナー５は、
供給ローラ３の回転によってケーシング６内面との当接
部に搬送され、供給ローラ３表面とケーシング６内面と
の当接部に進入されて両者に挟まれる。この進入の際、
供給ローラ３に担持されるトナー５のうち、過剰なもの
は掻き落とされる。供給ローラ３とケーシング６底面と
の当接部に挟まれたトナー５は、該当接部で摩擦されて
充分に帯電され、トナー供給位置としてのＢ部に搬送さ
れる。図示のように、供給ローラ３表面とケーシング６
内面との当接部は、Ｂ部の近傍で、且つ、Ｂ部よりも供
給ローラ３の回転方向下流側に設けられているので、該
当接部からＢ部まで回転される間の供給ローラ３表面
は、新たなトナー５を付着されない。この結果、Ｂ部に
過剰なトナー５が搬送されることはなく、適量のトナー
５が現像ローラ２に担持される。Ｂ部において現像ロー
ラ２に担持されたトナー５は、薄層化ブレード４と現像
ローラ２との間に挟まれてトナー薄層を形成される。そ
して、トナー薄層は、感光体ドラム１との対向部に移動
されて感光体ドラム１表面の静電潜像に選択的に付着す
ることで、該静電潜像を現像する。In the above configuration, the toner 5 stored in the casing 6 is supplied by the agitator 7 to the supply roller 3.
Transported to the surface of The surface of the supply roller 3 is rubbed at a contact portion with the inner surface of the casing 6 to promote the carrying of the transported toner 5, so that a sufficient amount of the toner 5 is carried. The toner 5 carried on the surface of the supply roller 3 is
By the rotation of the supply roller 3, the sheet is conveyed to the contact portion between the supply roller 3 and the inner surface of the casing 6, and enters the contact portion between the surface of the supply roller 3 and the inner surface of the casing 6 to be sandwiched therebetween. During this approach,
Excess toner 5 carried by the supply roller 3 is scraped off. The toner 5 sandwiched between the contact portion between the supply roller 3 and the bottom surface of the casing 6 is sufficiently charged by friction at the contact portion, and is conveyed to a portion B as a toner supply position. As shown, the surface of the supply roller 3 and the casing 6
Since the contact portion with the inner surface is provided near the portion B and further downstream than the portion B in the rotation direction of the supply roller 3, the supply roller 3 is rotated from the contact portion to the portion B. No new toner 5 is deposited on the surface. As a result, the excessive toner 5 is not conveyed to the portion B, and an appropriate amount of the toner 5 is carried on the developing roller 2. The toner 5 carried on the developing roller 2 at the portion B is sandwiched between the thinning blade 4 and the developing roller 2 to form a thin toner layer. Then, the thin toner layer is moved to a portion facing the photosensitive drum 1 and selectively adheres to the electrostatic latent image on the surface of the photosensitive drum 1, thereby developing the electrostatic latent image.
【００３８】以上、本実施形態の非磁性１成分現像装置
によれば、充分量のトナー５を供給ローラ３表面に担持
させるので、供給ローラ３から現像ローラ２に充分量の
トナー５を供給させることができる。また、供給ローラ
３表面とケーシング６底面との当接部で摩擦させたトナ
ー５を現像ローラ２に担持させるので、充分に摩擦帯電
させたトナー５を現像ローラ２に担持させることができ
る。また、現像ローラ２と供給ローラ３とを所定の間隙
で離間させているので、現像ローラ２の劣化、現像ロー
ラ２表面に形成されるトナー薄層の濃度ムラ及び厚みム
ラ、現像ローラ２の駆動トルクの増大、並びに、形成画
像に発生するバンディングを防止することができる。ま
た、Ｂ部に過剰なトナー５を搬送しないので、安定した
量のトナー５を現像ローラ２に供給することができる。As described above, according to the non-magnetic one-component developing device of the present embodiment, a sufficient amount of toner 5 is carried on the surface of the supply roller 3, so that a sufficient amount of toner 5 is supplied from the supply roller 3 to the developing roller 2. be able to. Further, since the developing roller 2 carries the toner 5 rubbed at the contact portion between the surface of the supply roller 3 and the bottom surface of the casing 6, the toner 5 sufficiently frictionally charged can be carried on the developing roller 2. Further, since the developing roller 2 and the supply roller 3 are separated from each other by a predetermined gap, the deterioration of the developing roller 2, the density unevenness and the thickness unevenness of the thin toner layer formed on the surface of the developing roller 2, the driving of the developing roller 2 It is possible to prevent an increase in torque and banding generated in a formed image. Further, since the excessive toner 5 is not conveyed to the portion B, a stable amount of the toner 5 can be supplied to the developing roller 2.
【００３９】次に、上記実施形態の非磁性１成分現像装
置において、請求項１、４及び５の構成を適用した第１
実施例について説明する。Next, in the non-magnetic one-component developing apparatus according to the above embodiment, the first aspect of the present invention, wherein
An example will be described.
【００４０】本第１実施例の非磁性１成分現像装置にお
いては、供給ローラ３を可撓性の発泡ポリウレタン（平
均セル径＝５０［μｍ］）で構成し、且つ、供給ローラ
３とケーシング６底面との喰い込み量を１．０［ｍｍ］
に設定している。このように喰い込み量を設定すること
により、供給ローラ３とケーシング６底面との摩擦抵抗
を増加させることができる。In the non-magnetic one-component developing apparatus of the first embodiment, the supply roller 3 is made of flexible foamed polyurethane (average cell diameter = 50 [μm]). 1.0 [mm]
Is set to By setting the bite amount in this way, the frictional resistance between the supply roller 3 and the bottom surface of the casing 6 can be increased.
【００４１】図４は、本第１実施例の非磁性１成分現像
装置における現像ローラ２と供給ローラ３との対向部
（トナー供給位置としてのＢ部）の拡大断面図である。
現像ローラ２と供給ローラ３との間隙は１［ｍｍ］以下
に設定されている。FIG. 4 is an enlarged sectional view of an opposing portion (part B as a toner supply position) between the developing roller 2 and the supply roller 3 in the non-magnetic one-component developing device of the first embodiment.
The gap between the developing roller 2 and the supply roller 3 is set to 1 [mm] or less.
【００４２】以上の構成において、供給ローラ３表面に
担持されたトナー５は、摩擦抵抗が増加された供給ロー
ラ３表面とケーシング６底面との当接部で充分に摩擦さ
れることにより、−４〜−６［μＣ／ｇ］に帯電され
る。帯電されたトナー５は、Ｂ部に搬送され、現像ロー
ラ２表面と接触して更に摩擦帯電されるとともに、現像
ローラ２表面とのファンデルワールスの力により現像ロ
ーラ２に付着して担持される（図４）。現像ローラ２表
面に担持されたトナー５は、薄層化ブレード４との当接
部において層厚を規制されて薄層化した後、感光体ドラ
ム１表面の静電潜像に選択的に付着する。In the above configuration, the toner 5 carried on the surface of the supply roller 3 is sufficiently rubbed at the contact portion between the surface of the supply roller 3 whose frictional resistance is increased and the bottom surface of the casing 6, so that -4. -6 [μC / g]. The charged toner 5 is conveyed to the portion B and is further frictionally charged in contact with the surface of the developing roller 2, and is adhered and carried on the developing roller 2 by Van der Waals force with the surface of the developing roller 2. (FIG. 4). The toner 5 carried on the surface of the developing roller 2 is thinned by regulating the layer thickness at a contact portion with the thinning blade 4, and then selectively adheres to the electrostatic latent image on the surface of the photosensitive drum 1. I do.
【００４３】以上、本第１実施例の非磁性１成分現像装
置によれば、供給ローラ３表面とケーシング６底面との
当接部、さらに、Ｂ部で摩擦させたトナー５を現像ロー
ラ２表面に担持させるので、充分に摩擦帯電させたトナ
ー５を現像ローラ２表面に担持させることができる。ま
た、供給ローラ３とケーシング６との摩擦抵抗を増加で
きるので、両者の間に挟まれるトナー５の摩擦帯電量を
増加できる。As described above, according to the non-magnetic one-component developing device of the first embodiment, the contact portion between the surface of the supply roller 3 and the bottom surface of the casing 6 and the toner 5 rubbed at the portion B are applied to the surface of the developing roller 2. Thus, the toner 5 sufficiently frictionally charged can be carried on the surface of the developing roller 2. Further, since the frictional resistance between the supply roller 3 and the casing 6 can be increased, the frictional charge amount of the toner 5 sandwiched between them can be increased.
【００４４】次に、上記実施形態の非磁性１成分現像装
置において、請求項３、４、５及び６の構成を適用した
第２実施例について説明する。Next, a description will be given of a second embodiment of the non-magnetic one-component developing apparatus according to the above-described embodiment, to which the configurations of claims 3, 4, 5, and 6 are applied.
【００４５】本第２実施例の非磁性１成分現像装置にお
いては、第１実施例の非磁性１成分現像装置と同様に、
発泡ポリウレタンからなる供給ローラ３は、ケーシング
６底面との喰い込み量を１．０［ｍｍ］に設定されるこ
とで、ケーシング６底面との摩擦抵抗を増加されてい
る。In the non-magnetic one-component developing device of the second embodiment, similar to the non-magnetic one-component developing device of the first embodiment,
The frictional resistance between the supply roller 3 made of the foamed polyurethane and the bottom surface of the casing 6 is increased by setting the bite amount with the bottom surface of the casing 6 to 1.0 [mm].
【００４６】また、薄層ブレード４は、トナー５の摩擦
帯電（マイナス極性）を助長するシリコン樹脂で構成さ
れている。トナー５の摩擦帯電を助長する材料として
は、シリコン樹脂の他にウレタン樹脂、ＰＥＴ樹脂等が
ある。The thin layer blade 4 is made of a silicone resin which promotes the triboelectric charging (minus polarity) of the toner 5. Examples of a material that promotes the triboelectric charging of the toner 5 include a urethane resin and a PET resin in addition to the silicon resin.
【００４７】図５は、本第２実施例の非磁性１成分現像
装置における現像ローラ２と供給ローラ３との対向部
（トナー供給位置としてのＢ部）の拡大断面図である。
現像ローラ２と供給ローラ３との間隙は０．５〜１［ｍ
ｍ］に設定されている。現像ローラ２には、ピーク・ツ
ウ・ピーク電圧５００［Ｖ］、平均電圧−４００
［Ｖ］、周波数［２ｋＨｚ］の現像バイアス交流電圧１
１が印加されており、供給ローラ３には、ピーク・ツウ
・ピーク電圧５００［Ｖ］、平均電圧−７００［ｖ］の
供給バイアス交流電圧１２が印加されている。FIG. 5 is an enlarged sectional view of an opposing portion (part B as a toner supply position) between the developing roller 2 and the supply roller 3 in the non-magnetic one-component developing device of the second embodiment.
The gap between the developing roller 2 and the supply roller 3 is 0.5 to 1 [m
m]. The developing roller 2 has a peak-to-peak voltage of 500 [V] and an average voltage of -400.
[V], developing bias AC voltage 1 of frequency [2 kHz]
1 is applied, and a supply bias AC voltage 12 having a peak-to-peak voltage of 500 [V] and an average voltage of -700 [v] is applied to the supply roller 3.
【００４８】以上の構成において、バイアス交流電圧の
印加によって現像ローラ２と供給ローラ３とには電位差
が生じる。この結果、供給ローラ３表面とケーシング６
底面との当接部でマイナス帯電されたトナー５は、Ｂ部
において電気的な力が付与されて飛翔し、供給ローラ３
表面と現像ローラ２表面との間を往復運動する（図
６）。なお、Ｂ部においては、充分に帯電されていない
トナー５は付与される電気的力が弱いので、飛翔しな
い。また、プラスに帯電されたトナー５は現像ローラ２
と反発する電気的力が付与される。Ｂ部における往復運
動によってトナー５は、現像ローラ２表面に一定層厚で
付着して担持される。現像ローラ２に担持されたトナー
５は、薄層化ブレード４との当接部で層厚を規制されて
薄層化するとともに、該当接部で摩擦されて帯電を補強
される。In the above configuration, a potential difference occurs between the developing roller 2 and the supply roller 3 due to the application of the bias AC voltage. As a result, the surface of the supply roller 3 and the casing 6
The toner 5 negatively charged at the contact portion with the bottom surface flies by applying an electric force at the portion B, and
It reciprocates between the surface and the surface of the developing roller 2 (FIG. 6). In the portion B, the toner 5 that is not sufficiently charged does not fly because the applied electric force is weak. The positively charged toner 5 is supplied to the developing roller 2.
And an electric force repelling is applied. Due to the reciprocating movement in the portion B, the toner 5 adheres and is carried on the surface of the developing roller 2 with a constant layer thickness. The thickness of the toner 5 carried on the developing roller 2 is regulated at the contact portion with the thinning blade 4 and the toner 5 is thinned, and the toner 5 is rubbed at the contact portion to reinforce the charge.
【００４９】以上、本第２実施例の非磁性１成分現像装
置によれば、Ｂ部に搬送されたトナー５に電気的な力を
付与するので、トナー５を確実に現像ローラ５表面に担
持させることができる。また、Ｂ部において、充分に帯
電されていないトナー５を飛翔させず、且つ、プラス帯
電された（正規の極性に帯電されていない）トナー５を
現像ローラ２と反発させるので、充分に且つ正規の極性
に帯電されたトナー５のみを現像ローラ２表面に担持さ
せることができる。また、供給ローラ３とケーシング６
との摩擦抵抗を増加できるので、両者の間に挟まれるト
ナー５の摩擦帯電量を増加できる。また、薄層化ブレー
ド４と現像ローラ２表面との当接部においてもトナー５
を摩擦帯電させることができるので、現像ローラ２表面
に担持されるトナー５の帯電量を補強することができ
る。As described above, according to the non-magnetic one-component developing apparatus of the second embodiment, since the electric force is applied to the toner 5 conveyed to the portion B, the toner 5 is surely carried on the surface of the developing roller 5. Can be done. In addition, in the portion B, the toner 5 that is not sufficiently charged is not caused to fly, and the toner 5 that has been positively charged (not charged to the regular polarity) is repelled from the developing roller 2. Only the toner 5 charged to the polarity of the developing roller 2 can be carried on the surface of the developing roller 2. The supply roller 3 and the casing 6
, The frictional charge of the toner 5 sandwiched between the two can be increased. Further, the toner 5 is also applied to the contact portion between the thinning blade 4 and the surface of the developing roller 2.
Of the toner 5 carried on the surface of the developing roller 2 can be reinforced.
【００５０】次に、上記第２実施例の非磁性１成分現像
装置における、供給ローラ３から現像ローラ２へのトナ
ー５の供給性の試験結果について説明する。図７は、供
給ローラ３に４００［Ｖ］のバイアス交流電圧を印加
し、且つ、感光体ドラム１表面のベタ静電潜像を現像さ
せたときに、形成されたベタ画像に付着されたトナーの
濃度を示したグラフである。図示のように、上記第２実
施例の非磁性１成分現像装置は、トナーの消費量を最大
とするベタ静電潜像を現像ローラ２の８回転分現像させ
ても、ベタ画像のトナー濃度を変化させない。これによ
り、現像ローラ２がトナー消費量を最大にするベタ静電
潜像を現像しても、供給ローラ３は該現像に必要なトナ
ー５を現像ローラ２に供給することがわかる。即ち、上
記第２実施例の非磁性１成分現像装置は、現像ローラ２
表面のトナー５の担持量を不足させない。なお、本試験
において設定された現像ローラ２と供給ローラ３との線
速比は、１対１である。Next, a description will be given of a test result of the supply property of the toner 5 from the supply roller 3 to the development roller 2 in the non-magnetic one-component developing apparatus of the second embodiment. FIG. 7 shows the toner attached to the formed solid image when a bias AC voltage of 400 [V] is applied to the supply roller 3 and the solid electrostatic latent image on the surface of the photosensitive drum 1 is developed. 5 is a graph showing the concentration of the lip. As shown in the drawing, the non-magnetic one-component developing apparatus of the second embodiment develops a solid electrostatic latent image that maximizes the toner consumption by eight rotations of the developing roller 2 even when the toner density of the solid image is increased. Does not change. Thus, even if the developing roller 2 develops a solid electrostatic latent image that maximizes the toner consumption, the supply roller 3 supplies the toner 5 necessary for the development to the developing roller 2. That is, the non-magnetic one-component developing device of the second embodiment
The amount of toner 5 carried on the surface is not insufficient. The linear velocity ratio between the developing roller 2 and the supply roller 3 set in this test is 1: 1.
【００５１】[0051]
【発明の効果】請求項１の発明によれば、充分量の現像
剤を上記現像剤供給部材の表面に担持させるので、該現
像剤供給部材から上記現像剤担持体に充分量の現像剤を
供給させることができるという優れた効果がある。ま
た、上記現像剤供給部材の表面と上記現像剤収容器の内
面との接触部、さらに、該現像剤供給部材と上記現像剤
担持体との対向部で摩擦させた現像剤を該現像剤担持体
に担持させるので、充分に摩擦帯電させた該現像剤を該
現像剤担持体に担持させることができるという優れた効
果がある。また、現像剤担持体と現像剤供給部材とを離
間させているので、該現像剤担持体の劣化、該現像剤担
持体の表面に形成される現像剤薄層の濃度ムラ及び厚み
ムラ、該現像剤担持体の駆動トルクの増大、並びに、形
成画像に発生するバンディングを防止することができる
という優れた効果がある。According to the first aspect of the present invention, a sufficient amount of the developer is carried on the surface of the developer supply member. Therefore, a sufficient amount of the developer is supplied from the developer supply member to the developer carrying member. There is an excellent effect that it can be supplied. Further, a developer rubbed at a contact portion between the surface of the developer supply member and the inner surface of the developer container, and at a facing portion between the developer supply member and the developer carrier, is loaded with the developer. Since the developer is carried on the body, there is an excellent effect that the developer sufficiently charged by friction can be carried on the developer carrier. Further, since the developer carrier and the developer supply member are separated from each other, the deterioration of the developer carrier, the unevenness of the density and the thickness of the thin developer layer formed on the surface of the developer carrier, There is an excellent effect that the driving torque of the developer carrying member can be increased and banding that occurs in a formed image can be prevented.
【００５２】請求項２の発明によれば、上記現像剤供給
部材の表面に担持された現像剤の上記現像剤担持体の表
面への移動が助長されるので、該現像剤を確実に該現像
剤担持体の表面に担持させることができるという優れた
効果がある。According to the second aspect of the present invention, the movement of the developer carried on the surface of the developer supply member to the surface of the developer carrier is promoted, so that the developer can be surely developed. There is an excellent effect that it can be carried on the surface of the agent carrier.
【００５３】請求項３の発明によれば、充分量の現像剤
を上記現像剤供給部材の表面に担持させるので、該現像
剤供給部材から上記現像剤担持体に充分量の現像剤を供
給させることができるという優れた効果がある。また、
上記現像剤供給部材の表面と上記現像剤収容器の内面と
の接触部で摩擦させた現像剤を上記現像剤担持体に担持
させるので、充分に摩擦帯電させた該現像剤を該現像剤
担持体に担持させることができるという優れた効果があ
る。また、現像剤担持体と現像剤供給部材とを離間させ
ているので、該現像剤担持体の劣化、該現像剤担持体の
表面に形成される現像剤薄層の濃度ムラ及び厚みムラ、
該現像剤担持体の駆動トルクの増大、並びに、形成画像
に発生するバンディングを防止することができるという
優れた効果がある。また、上記対向部に搬送された現像
剤に電気的な力を付与するので、該現像剤を確実に上記
現像剤担持体の表面に担持させることができるという優
れた効果がある。また、上記対向部において、充分に帯
電されていない現像剤を飛翔させず、且つ、正規の極性
に帯電されていない現像剤を上記現像剤担持体と反発さ
せるので、充分に且つ正規の極性に帯電された現像剤の
みを該現像剤担持体に担持させることができるという優
れた効果がある。According to the third aspect of the present invention, since a sufficient amount of the developer is carried on the surface of the developer supply member, a sufficient amount of the developer is supplied from the developer supply member to the developer carrier. There is an excellent effect that you can. Also,
Since the developer that has been rubbed at the contact portion between the surface of the developer supply member and the inner surface of the developer container is carried on the developer carrier, the developer sufficiently charged by friction is carried on the developer carrier. There is an excellent effect that it can be carried on the body. Further, since the developer carrier and the developer supply member are separated from each other, the deterioration of the developer carrier, unevenness in density and thickness of a thin developer layer formed on the surface of the developer carrier,
There is an excellent effect that the driving torque of the developer carrying member can be increased and banding generated in a formed image can be prevented. Further, since an electric force is applied to the developer conveyed to the facing portion, there is an excellent effect that the developer can be surely carried on the surface of the developer carrying member. Further, in the opposed portion, the developer that is not sufficiently charged is not caused to fly, and the developer that is not charged to the normal polarity is repelled from the developer carrier, so that the developer is sufficiently and properly charged. There is an excellent effect that only the charged developer can be carried on the developer carrier.
【００５４】請求項４の発明によれば、上記現像剤供給
部材は上記現像剤担持体に過剰な現像剤を供給しないの
で、安定した量の現像剤を該現像剤担持体に供給するこ
とができるという優れた効果がある。According to the fourth aspect of the present invention, since the developer supply member does not supply excessive developer to the developer carrier, it is possible to supply a stable amount of developer to the developer carrier. There is an excellent effect that it can be done.
【００５５】請求項５の発明によれば、上記現像剤供給
部材と上記現像剤収容器との摩擦抵抗を増加できるの
で、両者の間に挟まれる現像剤の摩擦帯電量を増加でき
るという優れた効果がある。According to the fifth aspect of the present invention, since the frictional resistance between the developer supply member and the developer container can be increased, the amount of frictional charge of the developer sandwiched therebetween can be increased. effective.
【００５６】請求項６の発明によれば、上記規制部材と
上記現像剤担持体との当接部においても現像剤を摩擦帯
電させることができるので、該現像剤担持体に担持され
る該現像剤の帯電量を補強することができるという優れ
た効果がある。According to the sixth aspect of the present invention, since the developer can be frictionally charged even at the contact portion between the regulating member and the developer carrier, the developer carried on the developer carrier can be charged. There is an excellent effect that the charge amount of the agent can be reinforced.
【図１】代表的な非磁性１成分現像装置の概略構成図。FIG. 1 is a schematic configuration diagram of a typical non-magnetic one-component developing device.
【図２】同非磁性１成分現像装置における現像ローラと
供給ローラとの当接部の拡大断面図。FIG. 2 is an enlarged sectional view of a contact portion between a developing roller and a supply roller in the non-magnetic one-component developing device.
【図３】本実施形態に係る非磁性１成分現像装置の概略
構成図FIG. 3 is a schematic configuration diagram of a non-magnetic one-component developing device according to the embodiment.
【図４】本第１実施例に係る非磁性１成分現像装置にお
けるトナー供給位置の拡大断面図。FIG. 4 is an enlarged sectional view of a toner supply position in the non-magnetic one-component developing device according to the first embodiment.
【図５】本第２実施例に係る非磁性１成分現像装置にお
けるトナー供給位置の拡大断面図。FIG. 5 is an enlarged sectional view of a toner supply position in the non-magnetic one-component developing device according to the second embodiment.
【図６】同非磁性１成分現像装置のトナー供給位置にお
けるトナー飛翔のモデル図。FIG. 6 is a model diagram of toner flying at a toner supply position of the non-magnetic one-component developing device.
【図７】同非磁性１成分現像装置における供給ローラか
ら現像ローラへのトナー供給性を示すグラフ。FIG. 7 is a graph showing toner supply from a supply roller to a developing roller in the non-magnetic one-component developing device.
１ 感光体ドラム ２ 現像ローラ ３ 供給ローラ ４ 薄層化ブレード ５ 非磁性１成分トナー ６ ケーシング ７ アジテータ １０ セル １１ 現像バイアス交流電圧 １２ 供給バイアス交流電圧 ２０ 非磁性１成分現像装置 DESCRIPTION OF SYMBOLS 1 Photoconductor drum 2 Developing roller 3 Supply roller 4 Thinning blade 5 Non-magnetic one-component toner 6 Casing 7 Agitator 10 Cell 11 Developing bias AC voltage 12 Supply bias AC voltage 20 Non-magnetic one-component developing device
Claims (6)
担持した現像剤で像担持体上の静電潜像を現像する現像
剤担持体と、表面が所定の方向に移動するように駆動さ
れ、該現像剤収容器に収容される現像剤を該表面に担持
して該現像剤担持体に供給する現像剤供給部材とを有
し、該現像剤担持体の表面と該現像剤供給部材の表面と
が離間している現像装置において、該現像剤供給部材の
表面と該現像剤収容器の内面とを接触させ、且つ、該現
像剤供給部材の表面に担持される現像剤を該現像剤担持
体の表面に接触させたことを特徴とする現像装置。A developer container for storing a developer, a developer carrier for developing an electrostatic latent image on an image carrier with the developer carried on the surface, and a surface moving in a predetermined direction. And a developer supply member that carries the developer contained in the developer container on the surface and supplies the developer to the developer carrier. The surface of the developer carrier and the developer In the developing device in which the surface of the supply member is separated, the surface of the developer supply member is brought into contact with the inner surface of the developer container, and the developer carried on the surface of the developer supply member is removed. A developing device, wherein the developing device is brought into contact with the surface of the developer carrier.
担持体と上記現像剤供給部材との表面に電位差を設けた
ことを特徴とする現像装置。2. The developing device according to claim 1, wherein a potential difference is provided between surfaces of said developer carrier and said developer supply member.
担持した現像剤で像担持体上の静電潜像を現像する現像
剤担持体と、表面が所定の方向に移動するように駆動さ
れ、該現像剤収容器に収容される現像剤を該表面に担持
して該現像剤担持体に供給する現像剤供給部材とを有
し、該現像剤担持体の表面と該現像剤供給部材の表面と
が離間している現像装置において、該現像剤供給部材の
表面と該現像剤収容器の内面とを接触させ、且つ、該現
像剤供給部材の表面に担持される現像剤と該現像剤担持
体の表面とを離間させるとともに両表面に電位差を設け
たことを特徴とする現像装置。3. A developer container for accommodating a developer, a developer carrier for developing an electrostatic latent image on the image carrier with the developer carried on the surface, and a surface moving in a predetermined direction. And a developer supply member that carries the developer contained in the developer container on the surface and supplies the developer to the developer carrier. The surface of the developer carrier and the developer In a developing device in which a surface of a supply member is separated, a surface of the developer supply member is brought into contact with an inner surface of the developer container, and a developer carried on the surface of the developer supply member. A developing device wherein the developer carrier is separated from the surface and a potential difference is provided between both surfaces.
上記現像剤供給部材の表面と上記現像剤収容部の内面と
の接触位置を、該表面と上記現像剤担持体の表面との間
における現像剤の供給位置の近傍で、且つ、該供給位置
よりも上記方向の下流側に配置したことを特徴とする現
像装置。4. The developing device according to claim 1, wherein:
The contact position between the surface of the developer supply member and the inner surface of the developer accommodating part is near the supply position of the developer between the surface and the surface of the developer carrying member, and from the supply position. A developing device, which is also arranged on the downstream side in the above direction.
供給部材を発泡弾性体からなる材料で構成したことを特
徴とする現像装置。5. The developing device according to claim 4, wherein said developer supply member is made of a material made of a foamed elastic body.
擦帯電を助長する材料からなり、上記現像剤担持体に当
接することで、該現像剤担持体に担持される現像剤の層
厚を規制する規制部材を設けたことを特徴とする現像装
置。6. A developing device according to claim 4, wherein said layer is made of a material which promotes triboelectric charging of said developer, and said layer thickness of said developer carried on said developer carrier is brought into contact with said developer carrier. A regulating member for regulating the pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33097997A JP3955666B2 (en) | 1997-11-14 | 1997-11-14 | Development device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33097997A JP3955666B2 (en) | 1997-11-14 | 1997-11-14 | Development device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11149213A true JPH11149213A (en) | 1999-06-02 |
| JP3955666B2 JP3955666B2 (en) | 2007-08-08 |
Family
ID=18238490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33097997A Expired - Fee Related JP3955666B2 (en) | 1997-11-14 | 1997-11-14 | Development device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3955666B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007086377A (en) * | 2005-09-21 | 2007-04-05 | Oki Data Corp | Developing device and image forming apparatus |
-
1997
- 1997-11-14 JP JP33097997A patent/JP3955666B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007086377A (en) * | 2005-09-21 | 2007-04-05 | Oki Data Corp | Developing device and image forming apparatus |
| US7885563B2 (en) | 2005-09-21 | 2011-02-08 | Oki Data Corporation | Development apparatus and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3955666B2 (en) | 2007-08-08 |
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