JP2006251382A - Developing blade and its manufacturing method - Google Patents

Developing blade and its manufacturing method Download PDF

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JP2006251382A
JP2006251382A JP2005067946A JP2005067946A JP2006251382A JP 2006251382 A JP2006251382 A JP 2006251382A JP 2005067946 A JP2005067946 A JP 2005067946A JP 2005067946 A JP2005067946 A JP 2005067946A JP 2006251382 A JP2006251382 A JP 2006251382A
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developing roller
elastic layer
developing
toner
edge portion
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JP5084001B2 (en
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Yasuhei Goto
泰平 後藤
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Bridgestone Corp
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Bridgestone Corp
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<P>PROBLEM TO BE SOLVED: To provide a developing roller which does not vary in toner charging quantity even when an elastic layer wears out as printing is repeated so that excellent images can be obtained, and a manufacturing method for the developing roller in which the developing roller can precisely be manufactured. <P>SOLUTION: Disclosed is a developing blade 10 which has a plate type member 12 and the elastic layer 11 fixed to the plate type member 12 and abuts against the developing roller 1 on the elastic layer 11 to restrict the amount of toner carried on the developing roller 1 and also charge the toner. The elastic layer 11 has a plurality of edge portions 11a to 11c along the length of the developing roller 1 and abuts against the developing roller 1 at the edge portion 11a, and abuts against the developing roller 1 at another edge portion 11b one by one instead as the edge portion 11a wears out. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は現像ブレードおよびその製造方法に関し、詳しくは、複写機、プリンタ等の各種画像形成装置における現像部に用いられる現像ブレードおよびその製造方法に関する。   The present invention relates to a developing blade and a manufacturing method thereof, and more particularly to a developing blade used in a developing unit in various image forming apparatuses such as a copying machine and a printer, and a manufacturing method thereof.

従来、複写機、ファクシミリ、プリンター等の電子写真方式あるいは静電記録方式の画像形成装置において、特にカラー用のものに関しては、非磁性トナーを帯電させ、その電荷により感光ドラムにトナー（現像剤）を転写する方式が採用されている。この方式においては、現像ローラ上にトナーを担持させて、その外周面と対向させた状態で取り付けられた現像ブレードにより、現像ローラ上のトナー量を規制するとともに、トナーの摩擦帯電を行っている。   2. Description of the Related Art Conventionally, in electrophotographic or electrostatic recording type image forming apparatuses such as copying machines, facsimiles, printers, etc., particularly those for color, nonmagnetic toner is charged, and the toner (developer) is applied to the photosensitive drum by the charge. The method of transferring is adopted. In this system, toner is carried on the developing roller and the amount of toner on the developing roller is regulated and the toner is triboelectrically charged by a developing blade attached in a state of facing the outer peripheral surface thereof. .

かかる現像ブレードとしては、従来、金属のみからなるものと、現像ローラに当接する部分をゴム等の弾性材料により形成したものとが知られている。このうち後者の弾性材料を用いた現像ブレードの一例を図２（ａ）に示す。図示する現像ブレード２０は、弾性材料からなる弾性層２１と、弾性層２１を支持する板状部材２２とからなり、図示するように、弾性層２１において現像ローラ１に当接して、現像ローラ１の回転によりその周面に担持されて運ばれるトナーの量の規制、および、トナーの摩擦帯電を行うものである。また、トナー層を均一に形成して良好な画像を得るために、弾性層２１のうち現像ローラ１と接触する部分は、図示するように、通常エッヂ形状に形成されている。   As such a developing blade, there are conventionally known a blade made of only metal and a blade formed of an elastic material such as rubber at a portion in contact with the developing roller. An example of the developing blade using the latter elastic material is shown in FIG. The illustrated developing blade 20 includes an elastic layer 21 made of an elastic material and a plate-like member 22 that supports the elastic layer 21. As illustrated, the developing blade 20 abuts on the developing roller 1 to contact the developing roller 1. The amount of toner carried and carried on the peripheral surface by the rotation of the toner and the frictional charging of the toner are performed. Further, in order to obtain a good image by uniformly forming the toner layer, the portion of the elastic layer 21 that is in contact with the developing roller 1 is usually formed in an edge shape as shown in the figure.

現像ブレードに関する改良技術としては、例えば、特許文献１に、ばね性のある金属薄板に、凸曲面を有するゴム状弾性体の表面に弾性のコーティング層を設けた複層構造ゴム状弾性体を形成した構成とすることで、耐摩耗性、耐加水分解性、耐オゾン性、低歪み性、摩擦帯電性、耐トナー性、表面平滑性等を満足し、低コストで生産性に優れる電子写真装置用現像ブレードを実現する技術が記載されている。また、特許文献２には、ブレード表面に融着したトナーを脱落させることができるように、その所定部を、トナーが供給された現像ローラの周面を擦ることにより摩耗できる材料からなるものとした現像装置が記載されており、ブレード摩耗時に押圧されるブレードにかかる押圧力の変化を抑えるように、ブレードが摩耗する部分の背面を弾力的に押圧して、摩耗量に等しいストローク量で背面を現像ローラ側に変位させる摩耗量補償手段を設けることについても記載されている。
特開２０００−１１２２３０号公報（特許請求の範囲等） 特開平１０−２４７０１６号公報（特許請求の範囲等） As an improvement technique related to the developing blade, for example, in Patent Document 1, a multi-layer structure rubber-like elastic body in which an elastic coating layer is provided on the surface of a rubber-like elastic body having a convex curved surface on a metal thin plate having a spring property is formed. By adopting such a configuration, an electrophotographic apparatus that satisfies wear resistance, hydrolysis resistance, ozone resistance, low distortion, triboelectric charging, toner resistance, surface smoothness, etc., and is excellent in productivity at low cost. A technique for realizing a developing blade for a printer is described. Patent Document 2 discloses that a predetermined portion of the toner is made of a material that can be worn by rubbing the peripheral surface of the developing roller supplied with the toner so that the toner fused to the blade surface can be removed. In order to suppress a change in the pressing force applied to the blade that is pressed when the blade is worn, the developing device is elastically pressed on the back surface of the portion where the blade is worn, and the back surface has a stroke amount equal to the wear amount. It is also described that wear amount compensation means for displacing the toner toward the developing roller is provided.
JP 2000-112230 A (Claims etc.) Japanese Patent Laid-Open No. 10-247016 (Claims)

図２（ａ）に示すような弾性層２１を備えた現像ブレード２０は、金属ブレードに比して現像ローラにダメージを与えにくいという利点があるが、その反面、繰り返し印刷に伴い逆に弾性層２１自体が摩耗により削れてしまうという欠点も有する。弾性層２１が削れると、接触面積が変わるためにトナー帯電量も変化してしまい、結果として画像不良が発生しやすくなるという問題が生じていた。特に、図示するようにエッヂ部で現像ローラに当接する弾性層２１の場合には、エッヂ部の摩耗に伴い接触面積が大きく増大するため（図２（ｂ）参照）、トナー帯電量の変化に伴って画像不良が発生しやすいという問題を有していた。   The developing blade 20 provided with the elastic layer 21 as shown in FIG. 2A has an advantage that the developing roller is less likely to be damaged than the metal blade. There is also a disadvantage that 21 itself is shaved due to wear. When the elastic layer 21 is scraped, the contact area is changed and the toner charge amount is also changed. As a result, there is a problem that an image defect is likely to occur. In particular, in the case of the elastic layer 21 in contact with the developing roller at the edge portion as shown in the drawing, the contact area greatly increases as the edge portion wears (see FIG. 2B), so that the toner charge amount changes. Along with this, there is a problem that image defects are likely to occur.

そこで本発明の目的は、繰り返し印刷に伴い弾性層が摩耗してもトナー帯電量が変化せず、従って良好な画像を得ることができる現像ブレード、および、かかる現像ブレードを精度良く製造することが可能な現像ブレードの製造方法を提供することにある。   Accordingly, an object of the present invention is to develop a developing blade capable of obtaining a good image without causing the toner charge amount to change even when the elastic layer is worn with repeated printing, and to accurately manufacture such a developing blade. It is an object of the present invention to provide a method for manufacturing a developing blade that can be used.

上記課題を解決するために、本発明者は鋭意検討した結果、トナー帯電量を変化させないためには、弾性層を、摩耗後においても現像ローラとの接触面積が変わらないような形状にすることが有効であることを見出して、本発明を完成するに至った。   In order to solve the above-mentioned problems, the present inventors have intensively studied. As a result, in order not to change the toner charge amount, the elastic layer has a shape that does not change the contact area with the developing roller even after wear. Has been found to be effective, and the present invention has been completed.

即ち、本発明の現像ブレードは、板状部材と、該板状部材に固着された弾性層とを備え、該弾性層で現像ローラに当接して、該現像ローラ上に担持されたトナーの量を規制するとともに該トナーを帯電させる現像ブレードにおいて、
前記弾性層が、前記現像ローラの長手方向に沿う複数のエッヂ部を有し、該エッヂ部で該現像ローラに当接し、かつ、該複数のエッヂ部が、該現像ローラに当接している一つのエッヂ部の摩耗に伴い、他のエッヂ部が代わって該現像ローラに順次当接するよう形成されていることを特徴とするものである。 That is, the developing blade of the present invention includes a plate-like member and an elastic layer fixed to the plate-like member, and contacts the developing roller with the elastic layer and the amount of toner carried on the developing roller. In a developing blade for regulating the toner and charging the toner,
The elastic layer has a plurality of edge portions along the longitudinal direction of the developing roller, the edge portion is in contact with the developing roller, and the plurality of edge portions are in contact with the developing roller. As one edge portion is worn, the other edge portion is formed so as to sequentially contact the developing roller instead.

本発明においては、前記一つのエッヂ部の最大摩耗量が、単位幅あたりの当接部面積の最大値で４２０〜６３０ｍｍ2であることが好ましい。また、前記弾性層は、好適には、シリコーンゴムからなる。 In the present invention, it is preferable that the maximum wear amount of the one edge portion is 420 to 630 mm 2 as a maximum value of the contact portion area per unit width. The elastic layer is preferably made of silicone rubber.

また、本発明の現像ブレードの製造方法は、上記現像ブレードの製造方法において、前記板状部材に対し前記弾性層の最終形状を決定する金型を固定して、該金型内に液状シリコーンゴム配合物を射出し、加硫することにより前記板状部材に前記弾性層を固着することを特徴とするものである。   The developing blade manufacturing method of the present invention is the above-described developing blade manufacturing method, wherein a mold for determining the final shape of the elastic layer is fixed to the plate-like member, and a liquid silicone rubber is contained in the mold. The elastic layer is fixed to the plate-like member by injecting and vulcanizing the blend.

なお、前述した特許文献２には、摺接部（当接部）をブレード端部に平面的に形成することにより摩耗時の接触面積の変化を少なくすることが記載されているが（段落［００２７］、［図２］）、一方で、摺接部がエッヂ状の場合には接触面積の変化が大きく、その結果押圧力の変化が大きくなるとも記載されており、本発明におけるように摺接部をエッヂ状に形成した場合において接触面積の変動を抑制し、トナー帯電量の変化、ひいては画像性の悪化を防止する技術については、なんら言及されていない。   In addition, Patent Document 2 described above describes that a change in contact area during wear is reduced by forming a sliding contact portion (abutment portion) on the blade end in a planar manner (paragraph [ 0027], [FIG. 2]), on the other hand, it is described that when the sliding contact portion is edge-shaped, the change in the contact area is large, and as a result, the change in the pressing force is large. No mention is made of a technique for suppressing the change in the contact area when the contact portion is formed in an edge shape, and preventing the change in the toner charge amount and the deterioration in the image quality.

本発明によれば、上記構成としたことにより、繰り返し印刷に伴い弾性層が摩耗した場合においても現像ローラとの接触面積の変動を抑制することができ、これによりトナー帯電量の変化を抑制して、画像不良の発生を防止することができる現像ブレードを実現することが可能となった。また、本発明の現像ブレードの製造方法によれば、かかる本発明の現像ブレードを精度良く製造することが可能である。   According to the present invention, the above configuration can suppress the change in the contact area with the developing roller even when the elastic layer is worn due to repeated printing, thereby suppressing the change in the toner charge amount. Thus, it is possible to realize a developing blade that can prevent the occurrence of image defects. Moreover, according to the developing blade manufacturing method of the present invention, the developing blade of the present invention can be manufactured with high accuracy.

以下、本発明の好適な実施の形態について詳細に説明する。
図１は、本発明の一例の現像ブレード１０を現像ローラ１に当接させた状態を示す。図示するように、本発明の現像ブレード１０は、板状部材１２と、この板状部材１２に固着された弾性層１１とを備え、弾性層１１で現像ローラ１０に当接して、現像ローラ１０上に担持されたトナーの量を規制するとともにトナーを帯電させる。 Hereinafter, preferred embodiments of the present invention will be described in detail.
FIG. 1 shows a state in which a developing blade 10 according to an example of the present invention is in contact with the developing roller 1. As shown in the figure, the developing blade 10 of the present invention includes a plate-like member 12 and an elastic layer 11 fixed to the plate-like member 12, and comes into contact with the developing roller 10 with the elastic layer 11. It regulates the amount of toner carried thereon and charges the toner.

本発明においては、弾性層１１が、現像ローラ１の長手方向に沿う、複数の、図示する例では３個のエッヂ部１１ａ〜１１ｃを有し、エッヂ部１１ａで現像ローラ１に当接し、かつ、複数のエッヂ部１１ａ〜１１ｃが、現像ローラ１に当接している一つのエッヂ部１１ａの摩耗に伴い、他のエッヂ部１１ｂが代わって現像ローラ１に順次当接するよう形成されている。これにより、使用に伴い弾性層１１が摩耗しても、次々新たなエッヂ部がトナー量の規制およびトナーの帯電を担うことになるので、弾性層１１と現像ローラ１との接触面積の変動を抑制することができ、結果としてトナー帯電量の変動に伴う画像不良の発生を防止することが可能となる。   In the present invention, the elastic layer 11 has a plurality of, in the illustrated example, three edge portions 11a to 11c along the longitudinal direction of the developing roller 1, and contacts the developing roller 1 at the edge portion 11a. The plurality of edge portions 11a to 11c are formed so as to sequentially contact the developing roller 1 in place of the other edge portion 11b in accordance with the wear of one edge portion 11a that is in contact with the developing roller 1. As a result, even if the elastic layer 11 is worn with use, new edge portions are responsible for regulating the toner amount and charging the toner one after another, so that the contact area between the elastic layer 11 and the developing roller 1 varies. As a result, it is possible to prevent the occurrence of image defects due to fluctuations in the toner charge amount.

本発明に係る弾性層１１の具体的な形状は、上記複数のエッヂ部を有するものであれば、図示する例に制限されるものではないが、例えば、その厚みは、１〜３ｍｍ程度とすることができる。また、エッヂ部の形状や寸法についても特に制限されるものではなく、現像ローラに当接した状態でトナー量の規制およびトナーの帯電を確実に行うことができるものであればよいが、トナー帯電量の変動の許容範囲の観点からは、一つのエッヂ部の最大摩耗量が、単位幅あたりの当接部面積（接触面積）の最大値で４２０〜６３０ｍｍ2であることが好ましい。即ち、エッヂ部の単位幅あたりの当接部面積が４２０〜６３０ｍｍ2程度となるまで摩耗した段階でそのエッヂ部に代わって他のエッヂ部が現像ローラ１に当接するように、弾性層１１の形状や、現像ローラに対する現像ブレードの相対的な位置を調整することで、トナー帯電量の変動をより好適な範囲内に抑えることができる。これは、図２（ｂ）中に示す当接部のローラ周方向に沿う幅ｘが２〜３ｍｍとなるまでがエッヂ部あたりの好適使用範囲であることを示しており、Ａ４用紙の幅に相当する接触面積に換算した値である。 The specific shape of the elastic layer 11 according to the present invention is not limited to the illustrated example as long as it has the plurality of edge portions. For example, the thickness is about 1 to 3 mm. be able to. The shape and dimensions of the edge portion are not particularly limited as long as the toner amount can be regulated and the toner can be reliably charged in contact with the developing roller. From the viewpoint of the allowable range of variation in amount, it is preferable that the maximum wear amount of one edge portion is 420 to 630 mm 2 in terms of the maximum value of the contact portion area (contact area) per unit width. That is, the elastic layer 11 is formed so that, in place of the edge portion, the other edge portion contacts the developing roller 1 when it is worn until the contact portion area per unit width of the edge portion is about 420 to 630 mm 2 . By adjusting the shape and the position of the developing blade relative to the developing roller, it is possible to suppress fluctuations in the toner charge amount within a more preferable range. This indicates that the preferred use range per edge portion is until the width x along the roller circumferential direction of the contact portion shown in FIG. It is the value converted into the corresponding contact area.

弾性層１１の材料としては、イソプレンゴム、ブタジエンゴム、スチレン・ブタジエンゴム、アクリロニトリル・ブタジエンゴム、クロロプレンゴム、エチレン・プロピレンゴム、エチレン・プロピレンターポリマー（ＥＰＤＭ）、ブチルゴム、アクリルゴム、クロロスルホン化ポリエチレン、シリコーンゴム、フッ素ゴム、ポリエーテルゴム、エピクロルヒドリンゴム、ウレタンゴム等のゴム材料や、ポリウレタン、シリコーン、ポリスチレン・ポリブタジエンブロック重合体、ポリオレフィン、ポリエチレン、塩素化ポリエチレン、エチレン・酢酸ビニル共重合体等のエラストマーなどが挙げられ、好ましくはシリコーンゴムを用いる。   Materials for the elastic layer 11 include isoprene rubber, butadiene rubber, styrene / butadiene rubber, acrylonitrile / butadiene rubber, chloroprene rubber, ethylene / propylene rubber, ethylene / propylene terpolymer (EPDM), butyl rubber, acrylic rubber, and chlorosulfonated polyethylene. Rubber materials such as silicone rubber, fluorine rubber, polyether rubber, epichlorohydrin rubber, urethane rubber, polyurethane, silicone, polystyrene / polybutadiene block polymer, polyolefin, polyethylene, chlorinated polyethylene, ethylene / vinyl acetate copolymer, etc. An elastomer etc. are mentioned, Preferably silicone rubber is used.

また、板状部材１２は、金属や樹脂により形成することができ、金属としては、例えば、鉄、銅、洋白、ステンレス、リン青銅などが挙げられ、現像ローラへの圧接力を制御する上で、好ましくは厚み０．１ｍｍ程度である。樹脂としては、例えば、ポリエチレン、ポリプロピレン、ポリスチレン、ポリ塩化ビニル、ポリ塩化ビニリデン、ポリウレタン、ポリアミド、ポリアセタール、ポリカーボネート、ポリエチレンテレフタレート、ポリイミド、ポリアミドイミド、ポリエステル、フェノール樹脂、メラミン樹脂、シリコーン樹脂、エポキシ樹脂、アクリル樹脂、メタクリル樹脂、尿素樹脂等の合成樹脂が挙げられ、好ましくは、厚み０．５〜１．０ｍｍのものである。   The plate-like member 12 can be formed of a metal or a resin. Examples of the metal include iron, copper, white, stainless steel, phosphor bronze, and the like, and control the pressure contact force to the developing roller. Thus, the thickness is preferably about 0.1 mm. Examples of the resin include polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, polyurethane, polyamide, polyacetal, polycarbonate, polyethylene terephthalate, polyimide, polyamideimide, polyester, phenol resin, melamine resin, silicone resin, epoxy resin, Synthetic resins such as acrylic resin, methacrylic resin, and urea resin can be used, and those having a thickness of 0.5 to 1.0 mm are preferable.

なお、本発明の現像ブレード１０の長さは、好ましくはＡ４からＡ３版対応を考慮し、２００〜３１６ｍｍ程度である。   The length of the developing blade 10 of the present invention is preferably about 200 to 316 mm in consideration of A4 to A3 plate correspondence.

本発明の現像ブレード１０の製造方法としては、特に制限されるものではなく、弾性層１１を板状部材１２に対し一体成形にて固着する方法や、別途成形した弾性層１１を接着剤等により板状部材１２に固着する方法など、従来公知の手法を適宜用いることが可能である。特に、弾性層１１をシリコーンゴムにて形成する場合には、板状部材１２に対し弾性層１１の最終形状を決定する金型を固定して、金型内に液状シリコーンゴム配合物を射出し、加硫することにより板状部材１２に弾性層１１を固着する、いわゆるＬＩＭ成形（Ｌｉｑｕｉｄ Ｉｎｊｅｃｔｉｏｎ Ｍｏｌｄｉｎｇ（リキッドインジェクションモールディング）、液状シリコーンゴム射出成形）の手法が好適である。ＬＩＭ成形によれば、多様な形状に精度良く対応が可能であるため、本発明に係る弾性層１１のエッヂ部についても、所望の形状を高精度で得ることができる。   The production method of the developing blade 10 of the present invention is not particularly limited, and is a method of fixing the elastic layer 11 to the plate-like member 12 by integral molding, or the separately formed elastic layer 11 by an adhesive or the like. Conventionally known methods such as a method of fixing to the plate member 12 can be appropriately used. In particular, when the elastic layer 11 is formed of silicone rubber, a mold that determines the final shape of the elastic layer 11 is fixed to the plate-like member 12, and the liquid silicone rubber compound is injected into the mold. A method of so-called LIM molding (Liquid Injection Molding, liquid silicone rubber injection molding) in which the elastic layer 11 is fixed to the plate member 12 by vulcanization is suitable. According to the LIM molding, it is possible to accurately cope with various shapes, so that a desired shape can be obtained with high accuracy also for the edge portion of the elastic layer 11 according to the present invention.

ＬＩＭ成形に用いる液状シリコーンゴムは、下式、

Figure 2006251382
で示されるビニル末端を有するポリジメチルシロキサン（Ａ液）に、下式、
Figure 2006251382
で示されるケイ素原子結合水素原子を有するポリメチルシロキサン（Ｂ液）が付加することにより硬化する。過酸化物加硫と異なり付加反応であるため反応副生物の生成がなく、二次加硫は原則として不要である。混合前のＡ液、Ｂ液は室温では６ケ月以上放置しても安定なシェルフライフを有しているが、２液混合後は硬化が進行する。硬化速度は高温になるほど速くなる。Ａ液とＢ液との混合比率は１：１であるが、プラスマイナス１０％程度の変動があっても物性にはほとんど影響しない。 The liquid silicone rubber used for LIM molding is
Figure 2006251382
In the polydimethylsiloxane (A liquid) having a vinyl terminal represented by the following formula:
Figure 2006251382
It hardens | cures by adding the polymethylsiloxane (B liquid) which has a silicon atom bond hydrogen atom shown by these. Unlike peroxide vulcanization, it is an addition reaction, so there is no production of reaction by-products, and secondary vulcanization is not necessary in principle. The liquids A and B before mixing have a stable shelf life even when left at room temperature for 6 months or more, but curing proceeds after mixing the two liquids. The curing rate increases as the temperature increases. The mixing ratio of liquid A and liquid B is 1: 1, but even if there is a fluctuation of about plus or minus 10%, the physical properties are hardly affected.

本発明の一実施の形態に係る現像ブレードを現像ローラに当接させた状態を示す概略説明図である。It is a schematic explanatory drawing which shows the state which made the developing blade which concerns on one embodiment of this invention contact the developing roller. （ａ）は従来の現像ブレードを現像ローラに当接させた状態を示す概略説明図であり、（ｂ）は、現像ブレードのエッヂ部が削れた状態を示す概略説明図である。(A) is a schematic explanatory drawing which shows the state which made the conventional developing blade contact | abut to a developing roller, (b) is a schematic explanatory drawing which shows the state where the edge part of the developing blade was shaved.

符号の説明Explanation of symbols

１ 現像ローラ
１０ 現像ブレード
１１ 弾性層
１１ａ〜１１ｃ エッヂ部
１２ 板状部材 DESCRIPTION OF SYMBOLS 1 Developing roller 10 Developing blade 11 Elastic layer 11a-11c Edge part 12 Plate-shaped member

Claims (4)

板状部材と、該板状部材に固着された弾性層とを備え、該弾性層で現像ローラに当接して、該現像ローラ上に担持されたトナーの量を規制するとともに該トナーを帯電させる現像ブレードにおいて、
前記弾性層が、前記現像ローラの長手方向に沿う複数のエッヂ部を有し、該エッヂ部で該現像ローラに当接し、かつ、該複数のエッヂ部が、該現像ローラに当接している一つのエッヂ部の摩耗に伴い、他のエッヂ部が代わって該現像ローラに順次当接するよう形成されていることを特徴とする現像ブレード。 A plate-like member and an elastic layer fixed to the plate-like member are provided. The elastic layer abuts against the developing roller to regulate the amount of toner carried on the developing roller and to charge the toner. In the developing blade,
The elastic layer has a plurality of edge portions along the longitudinal direction of the developing roller, the edge portion is in contact with the developing roller, and the plurality of edge portions are in contact with the developing roller. A developing blade characterized in that, as one edge portion is worn, the other edge portion is formed to sequentially contact the developing roller instead. 前記一つのエッヂ部の最大摩耗量が、単位幅あたりの当接部面積の最大値で４２０〜６３０ｍｍ2である請求項１記載の現像ブレード。 The developing blade according to claim 1, wherein the maximum wear amount of the one edge portion is 420 to 630 mm 2 in terms of the maximum value of the contact portion area per unit width. 前記弾性層がシリコーンゴムからなる請求項１または２記載の現像ブレード。   The developing blade according to claim 1, wherein the elastic layer is made of silicone rubber. 請求項３記載の現像ブレードの製造方法において、前記板状部材に対し前記弾性層の最終形状を決定する金型を固定して、該金型内に液状シリコーンゴム配合物を射出し、加硫することにより前記板状部材に前記弾性層を固着することを特徴とする現像ブレードの製造方法。   4. The developing blade manufacturing method according to claim 3, wherein a mold for determining a final shape of the elastic layer is fixed to the plate member, a liquid silicone rubber compound is injected into the mold, and vulcanized. By doing so, the elastic layer is fixed to the plate-like member.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013061543A (en) * 2011-09-14 2013-04-04 Bridgestone Corp Blade for image forming device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1010862A (en) * 1996-06-21 1998-01-16 Seiko Epson Corp Developing device
JPH10268636A (en) * 1997-03-25 1998-10-09 Sharp Corp Developing device
JP2001117358A (en) * 1999-10-15 2001-04-27 Kinugawa Rubber Ind Co Ltd Developer regulating blade for developing device
JP2002116622A (en) * 2000-10-11 2002-04-19 Canon Inc Developer amount regulating member and developing device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1010862A (en) * 1996-06-21 1998-01-16 Seiko Epson Corp Developing device
JPH10268636A (en) * 1997-03-25 1998-10-09 Sharp Corp Developing device
JP2001117358A (en) * 1999-10-15 2001-04-27 Kinugawa Rubber Ind Co Ltd Developer regulating blade for developing device
JP2002116622A (en) * 2000-10-11 2002-04-19 Canon Inc Developer amount regulating member and developing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013061543A (en) * 2011-09-14 2013-04-04 Bridgestone Corp Blade for image forming device

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