JP4176266B2 - Image forming apparatus - Google Patents

Description

上記条件で長期間の画像出しの結果、キャリアＣが現像ローラ上に侵入することがなく、現像ローラ３１上のトナーＴのみよって高品位の画像を得ることができた。
【００１５】
本発明は、規制部材３５が、自発磁化を発生する磁性材料で構成され、かつ
規制部材３５の磁化の強さが供給部材３２の磁化の強さより小さくする現像装置である。ここで規制部材３５の材料であるが、フェライト系、マルテンサイト系ステンレス鋼、軸受鋼等の鉄合金材料が好適である。さらに、規制部材３５表面に複数の着磁パターンを形成したものが有効である。これは現像ローラ３１上のトナーＴに混じったキャリアＣを規制部材３５側に完全に掻き取り、また着磁ピッチにより輸送して供給部材３２内の磁石の磁力圏内に到達させるためである。磁力は磁石の方が強力なので容易にキャリアＣは供給部材３２上に戻る。但し、規制部材３５による磁力の及ぶ範囲は現像剤層に影響を与えない用に制限する必要がある。供給部材３２の磁石の磁力の及ぼす範囲を制限するために規制部材３５の中心を通過する垂直線に対して現像ローラ３１側だけになるように磁石の配設位置を現像ローラ３１に対向する位置にしたものである。
【００１６】
さらに、現像ロ−ラ３１はゴム材料が良好で、硬度は、ＪＩＳ規格（ＪＩＳ Ｋ６３０１）による測定でＪＩＳ−Ａ硬度１０〜７０ＨＳの範囲が良好でである。さらに、現像ローラ３１の直径は１０〜３０ｍｍで、表面を適宜あらして粗さＲｚ（十点平均粗さ）１〜４μｍとしたものである。この値はトナーＴ６の体積平均粒径に対して１３〜８０％となり、現像ロ−ラ３１表面に埋没することなくトナーＴが搬送される。
ここでゴム材料として使用できるものとしてシリコン、ブタジエン、ＮＢＲ、ヒドリン、ＥＰＤＭ等を上げることが出来る。更に現像ロ−ラ３１表面に、経時品質を安定化させるためにコ−ト材料を被覆することが良好である。現像ローラ３１の機能はトナーＴを坦持するためだけのものであり、従来のようにトナーＴと現像ローラ３１との摩擦帯電によるトナーＴへの帯電電荷付与の必要が無いために、現像ローラ３１は表面性、硬度と寸法精度を満たせば良いので材料の選択幅は格段に増えることとなる。
材料してはシリコン系又は、テフロン系が特に良好である。前者はトナーＴの帯電が良好になり、後者は離型性が優れているからである。また導電性を得るために適宜カ−ボンブラック等の導電性材料を含有させる場合もある。コ−ト層の厚みは５〜５０μｍの範囲が良好で、その範囲を逸脱するとひび割れ等の不具合が発生しやすい。
【００１７】
また、本発明は、規制部材３５が、弾性部材により構成されている現像装置である。材料特性は上記現像ローラ３の材料構成と同一でも良く、特に硬度を下げることにより現像ローラ３１との当接が均一になり、より均一な薄層が形成可能となる。
【００１８】
（第２の実施形態）
本発明は、前記規制部材３５が、クリーニング部材３６が当接されている現像装置である。図２は、本発明の一実施形態である画像形成装置に用いられる現像装置の概略を示す構成図である。規制部材３５にクリーニング部材（以下、「規制部材用スクレーパ」と記す。）３６を配設し、当接させるものである。キャリアＣは容易に供給部材３２に戻るが長期間使用すると規制部材３５にトナーＴが付着しやすくなる。それを規制部材用スクレーパ３６の当接で取り除こうとするものである。材料は硬度が、ＪＩＳ−Ａ
５０〜７０ＨＳの範囲を有するポリウレタン、シリコンゴム、フッ素ゴム等が良好である。
【００１９】
（実施例２）
規制部材に、下記規制部材用スクレーパ３６を配設した以外は、実施例１と同じ条件で画像出しの実験を行った。

上記条件で長期間の画像出しの結果、規制部材３５表面にトナーＴが付着することなく、キャリアＣが現像ローラ上に侵入することがなく現像剤Ｄを規制することができた。
【００２０】
（第３の実施形態）
請求項５に記載の発明は、現像ローラが、回転する方向に対して現像領域の下流で、トナーＴを現像ローラに供給する上流側で、電圧を印加するクリーニング部材が当接されている
図４は、請求項５に記載の発明の一実施形態である画像形成装置２に用いられる現像装置の概略を示す構成図である。
現像ローラ３に現像ローラ用クリーニング部材３７を配設し、当接させるものである。現像ローラ３１上の未現像のトナーＴは再度使用されるが、確実にクリーニングする事で残像等の異常画像が極めて発生しにくくなる。現像ローラ用クリーニング部材３７はローラ形状が良好でトナーＴ６を引きつけるようにトナーＴとは逆極性になるように電圧を印加する事で極めて効率よく未現像残トナーＴを掻き取ることができる。現像ローラ用クリーニング部材３７はＳＵＳ３０４等の金属、現像ローラ３１の材料のところで述べたゴム材料等も使用可能である。硬度はＪＩＳ−Ａ １０〜１９９ＨＳの範囲であれば良い。当接圧は線圧で３〜１０ｇ／ｍｍ程度が良好である。本実施例に於ける直径は１０ｍｎまた掻き取られた残トナーＴは現像ローラ用クリーニング部材３７に当接させたスクレーパ（以下、「クリーニング部材用スクレーパ」と記す。）３８により掻き取られることで現像ローラ用クリーニング部材３７表面を常にトナーＴ６の付着しない状態に保つことが出来る。
【００２１】
（実施例３）
現像ローラに、下記現像ローラ用クリーニング部材３７を配設した以外は、実施例１と同じ条件で画像出しの実験を行った。

上記条件で長期間の画像出しの結果、現像ローラ３１上の現像されなかったトナーＴはすべて掻き取ることができ、常に新たなトナーＴによって高品位の画像を安定して得ることができた。
【００２２】
【発明の効果】
以上説明したように、本発明の現像装置では、規制部材の当接面が移動しているのでトナー・キャリアの規制効果を高められる。本発明の現像装置では、供給部材の磁気特性が強くキャリアが供給部材へ戻るので現像ローラへのキャリアの付着が防止できる。本発明の現像装置では、規制部材表面の当接圧が均一に出来るので均一薄層が形成できる。本発明の現像装置では、規制部材表面が常に新しいので均一薄層が維持できる。本発明の現像装置では、未現像トナーを掻き取るので、常に新しいトナーが供給され高品位の画像が得られる。
【図面の簡単な説明】
【図１】請求項１ないし請求項５に記載の発明の一実施形態である現像装置を用いる画像形成装置の概略を示す構成図である。
【図２】請求項１、請求項２及び請求項３に記載の発明の一実施形態である現像装置の概略を示す構成図である。
【図３】請求項４に記載の発明の一実施形態である現像装置の概略を示す構成図である。
【図４】請求項５に記載の発明の一実施形態である現像装置の概略を示す構成図である。
【符号の説明】
１ 書込装置
２ 画像形成装置
３ コンピュータ等の外部機器
４ 画像読取装置
１０ インターフェース部
１１ ＬＤ駆動部
１２ ポリゴンミラー
１３ レンズ
１４ ミラー
１５ 画像識別部
２０ 感光体
２１ 帯電装置
２２ 転写・分離装置
２４ 搬送ローラ
２５ 給紙ローラ
２６ 給紙カセット
３０ 現像装置
３１ 現像ローラ
３２ トナー供給部材
３３ 攪拌部材
３４ スプリング
３５ 規制部材
３６ 規制部材用スクレーパ
３７ 現像ローラ用クリーニング部材
３８ クリーニング部材用スクレーパ
３９ トナー補給ローラ
４０ クリーニング装置
４１ クリーニングブレード
５０ 定着装置
Ｄ 現像剤
Ｃ キャリア
Ｔ トナー
Ｎ 規制部材内部磁石Ｎ極
Ｎ１、Ｎ２ 供給部材内部磁石Ｎ極
Ｓ１、Ｓ２ 供給部材内部磁石Ｓ極
Ｐ 記録部材
Ｖ 電源[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrophotographic image forming apparatus used for a copying machine, a printer, a facsimile, and the like. More specifically, the toner is supplied from a toner container in the developing device to form a thin toner layer on the developing roller. The present invention relates to an image forming apparatus that develops a latent image.
[0002]
[Prior art]
A developer used in an image forming apparatus that develops an electrostatic latent image formed on a photoreceptor and forms a visible image includes a two-component developer composed of toner and a carrier and a one-component developer composed of a single toner. There are drugs. Since this one-component developer generally contains a magnetic material that is black magnetite powder in the toner that is the developer, it is difficult to obtain a developer having a clear color for colors other than black. The development system using a one-component developer is advantageous from the viewpoints of downsizing, cost reduction, and reliability of the developing device. Furthermore, the two-component developer is subject to carrier deterioration and fluctuation of the mixing ratio of toner and carrier. However, the carrier has an average particle size of 20 to 100 μm, and the total surface area is very large, so that the toner can be easily triboelectrically charged. A relatively stable and good recorded image can be obtained. In addition, since the toner of the two-component developer does not contain a magnetic material and can be superposed and developed, a plurality of developing devices are arranged on the periphery of the photosensitive member, and the electrostatic latent image is developed a plurality of times. To form a multicolor image by superimposing the toner images on the photoconductor.
However, the magnetic material used for the carrier is an oxide of iron powder or ferrite, both of which are hard substances, and even if the surface of the carrier is coated with a resin, the developer layer containing the carrier contacts the photoreceptor. When developing is performed, the photosensitive member and the developing roller are likely to be damaged due to the influence of friction and the like caused by the filled and compressed developer. Therefore, a developing device or the like has been proposed in which only the toner is carried on the developing roller while utilizing frictional charging between the carrier of the two-component developer and the toner.
[0003]
For example, in Japanese Patent Laid-Open No. 3-100575, an image forming apparatus that performs development by selecting a two-component developer including toner and a carrier, supplying the toner to a toner carrier, and a regulating member that regulates the developer as a supply member There has been proposed a developing device which is arranged at an opposed position and further includes an elastic body in which a regulating member abuts on a toner carrier. For example, Japanese Patent Laid-Open No. 7-84450 discloses an image forming apparatus that selects a two-component developer having toner and carrier, supplies the toner to a toner carrier, and performs development.
[0004]
[Problems to be solved by the invention]
However, the above developing device has the following problems. In the developing device disclosed in Japanese Patent Laid-Open No. Hei 3-100575, an elastic body, which is a toner regulating member, is brought into contact with the toner carrier in one place, so that the toner adheres to the toner carrier and a carrier having a small particle size can be regulated. Instead, it passes through the toner regulating member and is conveyed to the developing region by the toner carrier.
Further, in the image forming apparatus disclosed in JP-A-7-84450, there is no thin layer regulating member in contact with the donor roll and there is a possibility that the carrier easily adheres, and the toner thin layer on the donor roll is composed of the carrier and the toner. Since it depends on the mixed state of the particles, there is a problem that it is difficult to obtain a stable uniform thin layer.
[0005]
The present invention has been made in view of the above-described problems. The toner and the carrier are mixed and stirred to be charged, and the magnetic brush is formed so that only the toner is selected and carried on the developing roller. In the method of developing the electrostatic latent image on the image carrier, always utilizing the development characteristics faithful to the latent image of the contact one-component development and the uniform toner charging and maintaining the supply capability of the two-component development system. This is an attempt to build a stable development system.
Therefore, an object of the present invention is to cause damage to the image carrier when a carrier having a particle diameter larger than that of the toner is mixed in the developing region in the contact one-component development in which the developing roller and the image carrier are in contact via the toner layer. There is provided an image forming apparatus capable of obtaining a high-quality image by forming a very uniform toner thin layer on the developing roller without causing the carrier to enter the developing region in order to significantly reduce the image quality. That is.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a supply member that carries a two-component developer comprising a toner and a carrier, and a toner in the two-component developer conveyed by the supply member. A developing roller for carrying and transporting the toner, and a rotatable restricting member that contacts the developing roller on the upstream side of the developing region in the transport direction of the developing roller, and transferred to the developing roller A regulating member that regulates the amount of toner and prevents the carrier from entering, and a cleaning member that contacts the regulating member, and carries an electrostatic latent image facing the developing roller by the toner carried on the developing roller. a developing device is developed with a developing area formed between the image bearing member, the regulating member has a plurality of magnetized patterns on its surface, the magnetized pattern With collecting the carrier adhering to the developing roller by magnetic force, the developing roller is a developing device that consists of a rubber material. The present invention is characterized in that the carrier scraped by the regulating member is configured to return onto the supply member by the magnet of the supply member.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
The present invention is a developing device in which a supply member having a magnet therein, a rotatable regulating member in contact with the developing roller, and a developing roller carrying only toner are disposed. FIG. 1 is a configuration diagram showing an outline of an image forming apparatus using a developing device according to an embodiment of the invention described in claims 1 to 5. In FIG. 1, a rotating image carrier 20 (hereinafter referred to as “photosensitive member”), a charging device 21 for charging the photosensitive member 20, an LD driving unit 11 that performs exposure with laser light, and a photosensitive member. The developing device 30 that develops the electrostatic latent image on the toner 20, the transfer device that transfers the toner image developed on the photoreceptor 20 onto the recording member P, and the residual toner on the photoreceptor 20 by the cleaning blade 41 are cleaned. The image forming apparatus 2 is configured by the cleaning device 40 and the like. An image forming operation will be described. Image data from a computer or the like is transferred to the control unit 2 to control the lighting of the laser beam. Laser light is applied to the photoconductor 20 of the image forming apparatus 2 to form an electrostatic latent image. In the center, there is a photoreceptor 20 coated with an organic photoreceptor 20 (OPC) on the surface, which rotates in the direction of the arrow. There is a charging device 23 along the moving direction of the photoconductor 20, whereby the surface of the photoconductor 20 is uniformly charged, and an LD latent image is formed on the surface of the photoconductor 20 by writing LD light by the LD driving unit 11. Is done. The toner T is developed along the electrostatic latent image by the toner T stored in the developing device 30. In the developing device 30, the surface potential of the photosensitive member 20 after image exposure is set to a predetermined potential, and a developing bias is applied to the developing roller 31 so that the toner T adheres to the image portion of the laser light irradiation portion (reversal). Development) is performed. Next, transfer to the recording member P by the transfer device 22, cleaning on the photoconductor 20 by the cleaning device 40, and an image forming process proceed. After the recording member P is separated from the photoconductor 20, a toner image is obtained by the fixing device 50. Is fixed. By repeating these steps, the image forming cycle is repeated.
[0008]
FIG. 2 is a configuration diagram showing an outline of a developing device according to an embodiment of the present invention . The developing device 30 includes a developing roller 31 provided facing the photoconductor 20, a regulating member that regulates the toner T layer on the developing roller, a supply member 32 that supplies the toner T to the developing roller 31, a toner T, It is comprised with the stirring member 33 etc. which mix and stir the carrier C. The developing device 30 operates as follows. The toner supply roller 39 rotates the toner T stored in the toner storage container 90 in response to a signal from a control unit (not shown) to supply the developing device 30 from the toner storage container 90. The replenished toner T is replenished to the developer D in which the toner T and the carrier C in the developing device 30 are mixed. The replenished toner T is mixed in the developer D by the agitating member 33 and charged by friction charging with the carrier C. The toner T (black circle in FIG. 2) is adsorbed by the oppositely charged carrier C (white circle in FIG. 2) and electrostatic force, and on the sleeve of the supply member 32 by the magnetic force of the supply member 32 and the magnetic force of the carrier C. Supported.
[0009]
The developer D carried on the supply member 32 is regulated by the regulating member 35, and a certain amount of toner T is transferred to the developing roller 31 by the applied bias voltage or the like, and the rest is returned to the developing device. The interval of the closest part between the regulating member 2 and the supply member 324 is set to 1 mm or less. In particular, 500 μm or less is preferable. Further, the magnetic pole N1 of the magnet facing the regulating member 35 is positioned with an angle θ inclined to the upstream side of the regulating member 35 in the rotation direction of the supply member 32. This angle θ is preferably 5 to 45 °. Thereby, the circulating flow of the developer D can be easily formed. Here, it is necessary that the N and S poles of the magnet are the same, but the N and S poles may be opposite poles.
The supply member 32 has a non-magnetic rotatable sleeve shape, and a plurality of magnets are disposed therein. The magnet has four magnetic poles of N1, S1, N2, and S2 in the rotation direction of the supply member 32 from the place of the regulating member 35. Since the magnet is fixed, a magnetic force can be applied when the developer D passes through a predetermined place. The surface of the sleeve is roughened so as to fall within the range of 10 to 20 μm Rz by sandblasting. The developer D in which the toner T6 and the carrier C5 are mixed is carried on the supply member 32 by a magnetic field formed by a magnet.
[0010]
The regulating member 35 is in contact with the magnetic brush of the developer D formed on the supply member 32 at the portion facing the supply member 32 of the developing roller 31 and is also in contact with the developing roller 31. The rotation methods of the regulating member 35, the developing roller 31, and the supply member 32 are as shown by the arrows in FIG. The developing roller 31 is in contact with the photoconductor 20 to develop the latent image on the photoconductor 20. The contact pressure of the regulating member 35 against the developing roller 31 is optimally considerably lower than the pressure of the normal thin layer regulation in the range of 1 to 10 gf / mm in linear pressure.
[0011]
The developing roller 31 is opposed to a region on the S1 side of the magnet on which the magnetic brush of the developer D of the supply member 32 is formed so as to be in contact with the magnetic brush of the developer D on the supply member 32, and It is arrange | positioned facing. The toner T on the developing roller 31 is optimally in the range of −10 to −40 μC / g. The toner T transferred onto the developing roller 31 comes into contact with the regulating member 35 to form a uniform thin layer. At this time, the charging of the toner T is made more uniform, and the carrier C is prevented from entering.
[0012]
There are two methods for regulating the particles to form a thin layer: a rigid body or an elastic body is brought into contact with the developing roller 31 carrying the particles, and a rotating body is brought into contact as in the present invention. The difference is considered to be the contact force and the thin layer regulation effect. As for the former, a counter contact method with high regulation capability is assumed, but there are two types, edge contact and belly contact contact. In the former, the regulation efficiency is extremely high, but there is little margin in that a uniform thin layer is formed, and vertical stripes are likely to occur. In the latter, since the abdomen contact does not contact the tip, the margin for contact is improved, but the contact area increases, and therefore the contact force must be increased. Further, it is disadvantageous because it tends to stay in the wedge portion formed by the tip of the elastic body and the developing roller 3. On the other hand, in the method of contacting the rotating body of the present invention, since the contact portion of the surface changes even with a relatively low contact force, a new surface always comes into contact, so that the regulation effect can be maintained, and the surface movement direction can be maintained. We believe that regulatory efficiency is extremely high by returning particles.
[0013]
As the developer D, for example, a carrier C having a ferrite particle as a core and a surface coated with a silicone resin or the like and a toner T mainly composed of a thermoplastic resin colored with carbon black are mixed. Use what you did. Carrier C is made of a magnetic core material such as iron powder, ferrite, or magnetite coated with acrylic, silicone, or fluorine resin, or magnetite fine powder is dispersed in an acrylic resin binder. Are usually used. The resistance of the carrier C is controlled to an appropriate value by the resin coating material and the resin binder, and the durability of the carrier C is improved. The particle size is preferably in the range of 20 to 50 μm. As the toner T, an acrylic resin, a polyester resin, or an epoxy resin containing carbon black, a magnetite black pigment, or an organic pigment such as copper phthalocyanine, quinacridone, or carmine can be used. Further, in order to improve the characteristics of the toner T, a charge control material (CCA), wax or the like may be included. Further, some toners T may be added with metal oxides such as silica, titanium oxide, and alumina in order to impart fluidity and the like. The particle size of the additive is usually in the range of 0.1 to 1.5 μm. The range of the volume average particle diameter of the toner T is preferably 3 to 12 μm, but if it is 7 μm or less, it can sufficiently cope with a high resolution image of 1200 dpi or more. The material such as the fat coat of the carrier C and the toner T can be appropriately selected depending on the developing conditions such as the polarity of the photoconductor 20 and the linear velocity of the photoconductor 20.
[0014]

As a result of long-term image output under the above conditions, the carrier C did not enter the developing roller, and a high-quality image could be obtained only with the toner T on the developing roller 31.
[0015]
The present invention is a developing device in which the restricting member 35 is made of a magnetic material that generates spontaneous magnetization, and the intensity of magnetization of the restricting member 35 is smaller than the intensity of magnetization of the supply member 32. Here, the material of the regulating member 35 is preferably an iron alloy material such as ferritic, martensitic stainless steel, or bearing steel. Further, it is effective to form a plurality of magnetized patterns on the surface of the regulating member 35. This is because the carrier C mixed with the toner T on the developing roller 31 is completely scraped to the regulating member 35 side and transported by the magnetization pitch to reach the magnetic field of the magnet in the supply member 32. Since the magnet is stronger in magnetic force, the carrier C easily returns onto the supply member 32. However, it is necessary to limit the range of the magnetic force exerted by the regulating member 35 so as not to affect the developer layer. In order to limit the range in which the magnetic force of the magnet of the supply member 32 is exerted, the magnet is disposed at a position facing the developing roller 31 so as to be only on the developing roller 31 side with respect to a vertical line passing through the center of the regulating member 35. It is a thing.
[0016]
Further, the developing roller 31 has a good rubber material, and the hardness is good in the range of JIS-A hardness 10 to 70 HS as measured by JIS standard (JIS K6301). Further, the diameter of the developing roller 31 is 10 to 30 mm, and the surface is appropriately rendered to have a roughness Rz (10-point average roughness) of 1 to 4 μm. This value is 13 to 80% of the volume average particle diameter of the toner T6, and the toner T is conveyed without being buried in the surface of the developing roller 31.
Here, silicon, butadiene, NBR, hydrin, EPDM, and the like can be used as rubber materials. Further, it is preferable to coat the surface of the developing roller 31 with a coating material in order to stabilize the quality over time. The function of the developing roller 31 is only for carrying the toner T, and since there is no need to apply a charged charge to the toner T by frictional charging between the toner T and the developing roller 31 as in the prior art, the developing roller 31 Since 31 only needs to satisfy the surface property, hardness and dimensional accuracy, the selection range of the material is remarkably increased.
As a material, silicon or Teflon is particularly preferable. This is because the former has good charging of the toner T, and the latter has excellent releasability. In order to obtain conductivity, a conductive material such as carbon black may be appropriately contained. The thickness of the coat layer is preferably in the range of 5 to 50 μm, and defects such as cracks are likely to occur if the thickness deviates from the range.
[0017]
Further, the present invention is a developing device in which the regulating member 35 is constituted by an elastic member. The material characteristics may be the same as the material structure of the developing roller 3, and the contact with the developing roller 31 becomes uniform by lowering the hardness, and a more uniform thin layer can be formed.
[0018]
(Second Embodiment)
The present invention is a developing device in which the regulating member 35 is in contact with a cleaning member 36. FIG. 2 is a configuration diagram showing an outline of a developing device used in the image forming apparatus according to the embodiment of the present invention . A cleaning member (hereinafter, referred to as “restricting member scraper”) 36 is disposed on the restricting member 35 and brought into contact therewith. The carrier C easily returns to the supply member 32, but the toner T tends to adhere to the regulating member 35 when used for a long period of time. This is intended to be removed by the contact of the regulating member scraper 36. The material has a hardness of JIS-A
Polyurethane, silicon rubber, fluororubber and the like having a range of 50 to 70 HS are good.
[0019]
(Example 2)
An experiment for image output was performed under the same conditions as in Example 1 except that the following scraping member scraper 36 was disposed on the regulating member.

As a result of long-term image output under the above-described conditions, the developer D could be regulated without the toner T adhering to the surface of the regulating member 35 and without the carrier C entering the developing roller.
[0020]
(Third embodiment)
According to the fifth aspect of the present invention, the developing roller is in contact with the cleaning member for applying a voltage downstream of the developing region and upstream of supplying the toner T to the developing roller with respect to the rotating direction. 4 is a configuration diagram showing an outline of a developing device used in the image forming apparatus 2 according to an embodiment of the invention described in claim 5.
A developing roller cleaning member 37 is disposed on the developing roller 3 and brought into contact therewith. The undeveloped toner T on the developing roller 31 is used again, but an abnormal image such as an afterimage is very unlikely to occur by reliably cleaning. The developing roller cleaning member 37 has a good roller shape, and can apply the voltage so as to have the opposite polarity to the toner T so as to attract the toner T6, so that the undeveloped residual toner T can be scraped off very efficiently. The developing roller cleaning member 37 may be made of a metal such as SUS304 or the rubber material described in the material of the developing roller 31. The hardness may be in the range of JIS-A 10-199HS. The contact pressure is preferably about 3 to 10 g / mm in terms of linear pressure. In this embodiment, the diameter is 10 nm, and the scraped residual toner T is scraped off by a scraper 38 (hereinafter referred to as a “cleaning member scraper”) that is in contact with the developing roller cleaning member 37. The surface of the developing roller cleaning member 37 can always be kept free of toner T6.
[0021]
(Example 3)
An image printing experiment was performed under the same conditions as in Example 1 except that the developing roller cleaning member 37 described below was disposed on the developing roller.

As a result of long-term image formation under the above conditions, all the toner T that was not developed on the developing roller 31 could be scraped off, and a high-quality image could always be stably obtained with the new toner T.
[0022]
【The invention's effect】
As described above, in the developing device of the present invention, since the contact surface of the regulating member is moved, the regulation effect of the toner carrier can be enhanced. In the developing device of the present invention, since the magnetic property of the supply member is strong and the carrier returns to the supply member, adhesion of the carrier to the developing roller can be prevented. In the developing device of the present invention, since the contact pressure on the surface of the regulating member can be made uniform, a uniform thin layer can be formed. In the developing device of the present invention, since the surface of the regulating member is always new, a uniform thin layer can be maintained. In the developing device of the present invention, since the undeveloped toner is scraped off, new toner is always supplied and a high-quality image can be obtained.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an outline of an image forming apparatus using a developing device according to an embodiment of the invention described in claims 1 to 5;
FIG. 2 is a configuration diagram showing an outline of a developing device according to an embodiment of the invention described in claims 1, 2, and 3.
FIG. 3 is a structural diagram showing an outline of a developing device according to an embodiment of the invention as set forth in claim 4;
FIG. 4 is a structural diagram showing an outline of a developing device according to an embodiment of the invention as set forth in claim 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Writing apparatus 2 Image forming apparatus 3 External apparatus, such as a computer 4 Image reading apparatus 10 Interface part 11 LD drive part 12 Polygon mirror 13 Lens 14 Mirror 15 Image identification part 20 Photoconductor 21 Charging apparatus 22 Transfer / separation apparatus 24 Conveying roller 25 feeding roller 26 feeding cassette 30 developing device 31 developing roller 32 toner supply member 33 stirring member 34 spring 35 regulating member 36 regulating member scraper 37 developing roller cleaning member 38 cleaning member scraper 39 toner supply roller 40 cleaning device 41 Cleaning blade 50 Fixing device D Developer C Carrier T Toner N Restriction member internal magnet N pole N1, N2 Supply member internal magnet N pole S1, S2 Supply member internal magnet S pole P Recording member V Power supply

Claims (2)

A supply member which is provided with a magnet and carries and conveys a two-component developer composed of toner and a carrier;
A developing roller that is supplied with toner in the two-component developer conveyed by the supply member and carries the toner;
A rotatable restricting member that contacts the developing roller upstream of the developing region in the transport direction of the developing roller, and restricts the amount of the toner transferred to the developing roller and prevents the carrier from entering. Members,
A cleaning member that contacts the regulating member,
A developing device for developing in a developing region formed between the toner carried on the developing roller and an image bearing member carrying an electrostatic latent image facing the developing roller;
The regulating member has a plurality of magnetization patterns on its surface, collects the carrier attached to the developing roller by the magnetic force of the magnetization pattern ,
The developing device, wherein the developing roller is made of a rubber material. The developing device according to claim 1, wherein the carrier scraped off by the regulating member is configured to return onto the supply member by a magnet of the supply member.

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