JP2008216275A - Developing blade - Google Patents

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JP2008216275A
JP2008216275A JP2007049204A JP2007049204A JP2008216275A JP 2008216275 A JP2008216275 A JP 2008216275A JP 2007049204 A JP2007049204 A JP 2007049204A JP 2007049204 A JP2007049204 A JP 2007049204A JP 2008216275 A JP2008216275 A JP 2008216275A
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blade
developing
developer
end side
developing blade
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Hiroshi Nakamura
洋 中村
Junji Tsuboi
順治 坪井
Shinji Soma
伸次 相馬
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Fujikura Composites Inc
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Fujikura Rubber Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a developing blade capable of preventing leakage of developer in an electrophotographic image forming apparatus. <P>SOLUTION: The developing blade is equipped with a supporting member 12 and a blade member 15 disposed along one end side part 12A of the supporting member 12, wherein the supporting member 12 has notched parts for developer circulation 13 in the vicinity of ends 12a on both sides of the end side part 12A, and the blade member 15 is provided to extend over the notched parts for developer circulation 13 to the vicinity of the ends 12a on both sides of the end side part 12A, and has notched parts 16 corresponding to the notched parts for developer circulation 13. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、現像ブレードに係り、特にレーザプリンタ、複写機、ファクシミリ等の電子写真画像形成装置の現像装置に用いる現像ブレードに関する。   The present invention relates to a developing blade, and more particularly to a developing blade used in a developing device of an electrophotographic image forming apparatus such as a laser printer, a copying machine, and a facsimile machine.

電子写真画像形成プロセスを用いた画像形成装置では、感光体ドラム上の潜像を現像するための現像装置を備えている。この現像装置としては、例えば、図１１に示されるように、ホッパー５２、現像ローラ５３、回動可能な攪拌板５４、現像ブレード５５を備えたような構造の現像装置５１が知られている（特許文献１）。この現像装置５１では、ホッパー５２内の現像剤５６が攪拌板５４により現像ローラ５３に供給され、現像ブレード５５と現像ローラ５３との摩擦帯電により現像ローラ５３の周面上に現像剤が薄層で均一に担持され、余分な現像剤はホッパー５２内に戻される。そして、潜像が形成されている感光体ドラム５７に現像ローラ５３から現像剤５６が移行して現像が行われる。   An image forming apparatus using an electrophotographic image forming process includes a developing device for developing a latent image on a photosensitive drum. As this developing device, for example, as shown in FIG. 11, a developing device 51 having a structure including a hopper 52, a developing roller 53, a rotatable stirring plate 54, and a developing blade 55 is known ( Patent Document 1). In the developing device 51, the developer 56 in the hopper 52 is supplied to the developing roller 53 by the stirring plate 54, and the developer is thinly formed on the peripheral surface of the developing roller 53 by frictional charging between the developing blade 55 and the developing roller 53. The excess developer is returned to the hopper 52. The developer 56 is transferred from the developing roller 53 to the photosensitive drum 57 on which the latent image is formed, and development is performed.

従来の現像ブレード５５としては、例えば、図１２に示すように、厚みが０．１ｍｍ程度の金属製の支持部材６２の端側部６２Ａに沿って、ゴム製のブレード部材６５を備えた構造のものが知られている。
また、現像ブレード５５によって掻き取られた余分な現像剤が、ホッパー５２内に戻らずに、現像ローラ５３の長手方向の現像領域外へ漏れるのを防止するために、種々の端部シール部材が検討されている（特許文献２）。
特開２００３−４３８１２号公報 特開２００６−２０８５５２号公報 As a conventional developing blade 55, for example, as shown in FIG. 12, a rubber blade member 65 is provided along an end side portion 62A of a metal support member 62 having a thickness of about 0.1 mm. Things are known.
In order to prevent excess developer scraped off by the developing blade 55 from leaking out of the developing area in the longitudinal direction of the developing roller 53 without returning into the hopper 52, various end seal members are provided. It has been studied (Patent Document 2).
JP 2003-43812 A JP 2006-208552 A

しかしながら、従来の端部シール部材等を用いた現像剤の漏れ防止は不十分であり、現像剤の漏れをより確実に防止できる現像ブレードが要望されている。
本発明は、このような実情に鑑みてなされたものであり、電子写真画像形成装置における現像剤の漏れ防止が可能な現像ブレードを提供することを目的とする。 However, prevention of developer leakage using a conventional end seal member or the like is insufficient, and there is a demand for a developing blade that can more reliably prevent developer leakage.
The present invention has been made in view of such circumstances, and an object thereof is to provide a developing blade capable of preventing leakage of developer in an electrophotographic image forming apparatus.

このような目的を達成するために、本発明は、支持部材と、該支持部材の１つの端側部に沿って配設されたブレード部材とを備え、前記支持部材は前記端側部の両側の端部の近傍に現像剤循環用切欠き部を有し、前記ブレード部材は前記現像剤循環用切欠き部を越えて前記端側部の両側の端部近傍まで延設され、かつ、前記ブレード部材は前記現像剤循環用切欠き部に対応した切欠き部を有するような構成とした。   In order to achieve such an object, the present invention includes a support member and a blade member disposed along one end side portion of the support member, and the support member is provided on both sides of the end side portion. A developer circulation notch in the vicinity of the edge of the blade, and the blade member extends beyond the developer circulation notch to the vicinity of both ends of the end side, and The blade member is configured to have a notch corresponding to the developer circulation notch.

本発明の他の態様として、前記ブレード部材の長手方向の両側の端部に密着させて前記支持体上に現像剤漏れ防止テープを備えるような構成とした。
本発明の他の態様として、前記ブレード部材は前記支持部材の前記端側部と反対側の方向に突設されたスカート部を有し、該スカート部と前記ブレード部材の長手方向の両側の前記端部とが前記現像剤漏れ防止テープに密着しているような構成とした。 As another aspect of the present invention, a developer leakage prevention tape is provided on the support so as to be in close contact with both ends in the longitudinal direction of the blade member.
As another aspect of the present invention, the blade member has a skirt portion projecting in a direction opposite to the end side portion of the support member, and the skirt portion and the blade member on both sides in the longitudinal direction of the blade member. The end portion is in close contact with the developer leakage prevention tape.

本発明によれば、現像ブレードによって現像ローラから掻き取られた余分な現像剤は、一部がそのままホッパー内に落下して回収され、一部は支持部材が有する現像剤循環用切欠き部によって支持部材の反対面（現像ローラに当接されている面と反対側の面）へ送られてホッパー内に効率的に循環回収され、さらに、この現像剤循環用切欠き部を越えてブレード部材が支持部材の両側の端部近傍まで延設されているので、現像ブレードと現像ローラとの間に存在する現像剤が現像ブレードの長手方向の現像領域外へ漏れることが防止される。   According to the present invention, a part of the excess developer scraped off from the developing roller by the developing blade is dropped into the hopper as it is, and a part thereof is collected by the developer circulation notch portion of the support member. It is sent to the opposite surface of the support member (the surface opposite to the surface in contact with the developing roller) and is efficiently circulated and collected in the hopper. Further, the blade member extends beyond the developer circulation notch. Is extended to the vicinity of the end portions on both sides of the support member, so that the developer existing between the developing blade and the developing roller is prevented from leaking out of the developing region in the longitudinal direction of the developing blade.

また、前記ブレード部材の長手方向の両側の端部に密着させて支持体上に現像剤漏れ防止テープを備えることにより、現像剤の漏れ防止がより向上し、さらに、ブレード部材がスカート部を有することにより、ブレード部材と現像剤漏れ防止テープとの密着距離が長くなり、現像剤の漏れ防止が大幅に向上する。   Further, by providing a developer leakage prevention tape on the support in close contact with the longitudinal ends of the blade member, the leakage prevention of the developer is further improved, and the blade member has a skirt portion. As a result, the contact distance between the blade member and the developer leakage prevention tape is increased, and the prevention of developer leakage is greatly improved.

本発明の実施形態について図面を参照しながら説明する。
図１は、本発明の現像ブレードの一実施形態を示す平面図であり、図２は図１に示される現像ブレードの断面図であり、（Ａ）はＩ−Ｉ線矢視拡大断面図、（Ｂ）はII−II線矢視拡大断面図である。図１および図２に示されるように、現像ブレード１１は、支持部材１２と、この支持部材１２の片面に、長手方向（図１に矢印ａで示される方向）の１つの端側部１２Ａに沿って形成されたブレード部材１５とを備えている。 Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view showing an embodiment of the developing blade of the present invention, FIG. 2 is a cross-sectional view of the developing blade shown in FIG. 1, and (A) is an enlarged cross-sectional view taken along line I-I, (B) is an enlarged sectional view taken along line II-II. As shown in FIG. 1 and FIG. 2, the developing blade 11 has a supporting member 12 and one end side 12 </ b> A in the longitudinal direction (the direction indicated by the arrow a in FIG. 1) on one side of the supporting member 12. And a blade member 15 formed along.

また、支持部材１２は、端側部１２Ａの両側の端部１２ａ，１２ａの近傍に現像剤循環用切欠き部１３，１３を有している。また、ブレード部材１５は、現像剤循環用切欠き部１３，１３を越えて端側部１２Ａの両側の端部１２ａ，１２ａ近傍まで延設されている。さらに、ブレード部材１５は、現像剤循環用切欠き部１３，１３に対応した切欠き部１６，１６を有している。
現像ブレード１１を構成する支持部材１２は、その材質に制限はなく、例えば、ＳＵＳ３０１、ＳＵＳ３０４等のステンレス鋼、Ｃ５２１０等のバネ用リン青銅等からなる金属基板、セラミックス基板、ＰＣ（ポリカーボネート）、ＰＢＴ（ポリブチレンテレフタレート）等の樹脂基板等を挙げることができる。また、支持部材１２の厚みは、例えば、ステンレスであれば０．１ｍｍ程度が好ましい。 Further, the support member 12 has developer circulation notches 13 and 13 in the vicinity of the end portions 12a and 12a on both sides of the end side portion 12A. The blade member 15 extends beyond the developer circulation notches 13 and 13 to the vicinity of the end portions 12a and 12a on both sides of the end side portion 12A. Further, the blade member 15 has notches 16 and 16 corresponding to the developer circulation notches 13 and 13.
The material of the support member 12 constituting the developing blade 11 is not limited. For example, a metal substrate made of stainless steel such as SUS301 or SUS304, phosphor bronze for springs such as C5210, a ceramic substrate, PC (polycarbonate), PBT, or the like. Examples thereof include a resin substrate such as (polybutylene terephthalate). Further, the thickness of the support member 12 is preferably about 0.1 mm if it is stainless steel, for example.

支持部材１２が有する現像剤循環用切欠き部１３，１３は、現像ブレード１１と現像ローラとの間に存在する余分な現像剤を、支持部材１２の反対面（支持部材１２を介して現像ローラと反対側の面）へ送り、ホッパー内に効率的に循環回収するためのものである。このような現像剤循環用切欠き部１３，１３の大きさ、形状は適宜設定することができ、例えば、長方形状の切欠き部の場合、幅Ｗを１〜５ｍｍ、奥行きＤを０．５〜２．５ｍｍの範囲で設定することができる。
また、支持部材１２は、端側部１２Ａに対向する端側部１２Ｂに沿って複数の穴部１４を備えている。この穴部１４は取り付け用、位置決め用等、任意に設定することができ、図示例に限定されるものではない。 The developer circulation notches 13 and 13 included in the support member 12 remove excess developer existing between the developing blade 11 and the development roller from the opposite surface of the support member 12 (the development roller via the support member 12). To the other side) and efficiently circulate and collect in the hopper. The size and shape of the developer circulation notches 13 and 13 can be appropriately set. For example, in the case of a rectangular notch, the width W is 1 to 5 mm and the depth D is 0.5. It can set in the range of -2.5 mm.
Further, the support member 12 includes a plurality of hole portions 14 along the end side portion 12B facing the end side portion 12A. The hole 14 can be arbitrarily set for mounting, positioning, etc., and is not limited to the illustrated example.

現像ブレード１１を構成するブレード部材１５は、その材質に制限はなく、例えば、シリコーンゴム、ニトリルゴム、フッ素ゴム、ウレタンゴム、エピクロルヒドリンゴム、水素化ニトリルゴム等を挙げることができる。図示例のブレード部材１５は、現像ローラとの接触領域が曲面をなしている。このブレード部材１５が有する切欠き部１６，１６の形状は、上記の支持部材１２の現像剤循環用切欠き部１３，１３を閉塞することなく露出させるものであれば特に制限はない。例えば、切欠き部１６，１６を、現像剤循環用切欠き部１３，１３と同一の形状としてもよい。また、現像剤循環用切欠き部１３，１３よりも少し大きい（例えば、幅が１ｍｍ以内で支持部材１２が切欠き部１６，１６に露出する程度の大きさ）ものとしてもよい。   The material of the blade member 15 constituting the developing blade 11 is not limited, and examples thereof include silicone rubber, nitrile rubber, fluorine rubber, urethane rubber, epichlorohydrin rubber, and hydrogenated nitrile rubber. The blade member 15 in the illustrated example has a curved contact area with the developing roller. The shape of the notches 16 and 16 included in the blade member 15 is not particularly limited as long as the developer circulation notches 13 and 13 of the support member 12 are exposed without being blocked. For example, the notches 16 and 16 may have the same shape as the developer circulation notches 13 and 13. Further, it may be slightly larger than the developer circulation notches 13 and 13 (for example, the width is within 1 mm and the support member 12 is exposed to the notches 16 and 16).

このような現像ブレード１１では、現像ローラから掻き取られた余分な現像剤のうち、ホッパー内に落下せずに現像ブレード１１と現像ローラとの間に存在する余分な現像剤が、現像剤循環用切欠き部１３，１３によって支持部材１２の反対面へ送られ、その後、ホッパー内に落下して効率的に循環回収される。そして、現像剤循環用切欠き部１３，１３を越えてブレード部材１５が支持部材１２の両側の端部１２ａ，１２ａ近傍まで延設されているので、現像ブレード１１と現像ローラとの間に存在する現像剤が、現像ブレード１１の長手方向（図１に矢印ａで示される方向）の現像領域外へ漏れることが防止される。   In such a developing blade 11, of the excess developer scraped off from the developing roller, the excess developer existing between the developing blade 11 and the developing roller without falling into the hopper is not circulated in the developer. It is sent to the opposite surface of the support member 12 by the notches 13 and 13 for use, and then falls into the hopper and efficiently circulated and recovered. Since the blade member 15 extends beyond the developer circulation notches 13 and 13 to the vicinity of the end portions 12a and 12a on both sides of the support member 12, the blade member 15 exists between the developing blade 11 and the developing roller. The developing developer is prevented from leaking out of the developing region in the longitudinal direction of the developing blade 11 (the direction indicated by the arrow a in FIG. 1).

図３は、本発明の現像ブレードの他の実施形態を示す平面図である。図３に示される現像ブレード２１は、支持部材２２と、この支持部材２２の片面に、長手方向（図３に矢印ａで示される方向）の１つの端側部２２Ａに沿って形成されたブレード部材２５と、ブレード部材２５の長手方向の両側の端部２５ａ，２５ａに密着させて現像剤漏れ防止テープ２８，２８（図３では斜線を付して示している）を備えている。   FIG. 3 is a plan view showing another embodiment of the developing blade of the present invention. The developing blade 21 shown in FIG. 3 is a support member 22 and a blade formed on one side of the support member 22 along one end side portion 22A in the longitudinal direction (the direction indicated by the arrow a in FIG. 3). The member 25 and developer leakage prevention tapes 28 and 28 (shown by hatching in FIG. 3) are provided in close contact with both ends 25a and 25a of the blade member 25 in the longitudinal direction.

また、現像ブレード２１を構成する支持部材２２は、端側部２２Ａの両側の端部２２ａ，２２ａの近傍に現像剤循環用切欠き部２３，２３を有している。一方、ブレード部材２５は、現像剤循環用切欠き部２３，２３を越えて端側部２２Ａの両側の端部２２ａ，２２ａ近傍まで延設されており、現像剤循環用切欠き部２３，２３に対応した切欠き部２６，２６を有している。
現像ブレード２１を構成する支持部材２２、ブレード部材２５は、上述の現像ブレード１１の支持部材１２、ブレード部材１５と同様とすることができ、ここでの説明は省略する。 Further, the support member 22 constituting the developing blade 21 has developer circulation notches 23 and 23 in the vicinity of the end portions 22a and 22a on both sides of the end side portion 22A. On the other hand, the blade member 25 extends beyond the developer circulation notches 23, 23 to the vicinity of the end portions 22a, 22a on both sides of the end side portion 22A, and the developer circulation notches 23, 23. Has notches 26, 26 corresponding to the.
The supporting member 22 and the blade member 25 constituting the developing blade 21 can be the same as the supporting member 12 and the blade member 15 of the developing blade 11 described above, and a description thereof is omitted here.

現像ブレード２１を構成する現像剤漏れ防止テープ２８，２８は、ブレード部材２５の長手方向の両側の端部２５ａ，２５ａに密着した状態で支持部材２２に配設されている。これにより、現像ブレード２１と現像ローラとの間に存在する現像剤が、現像ブレード２１の長手方向（図３に矢印ａで示される方向）の現像領域外へ漏れることがより確実に防止される。
上記の現像剤漏れ防止テープ２８，２８の材質は、柔軟性のある材質が好ましく、例えば、（株）ロジャースイノアック製 マイクロセルポリマーシートＰＯＲＯＮ等を挙げることができる。また、現像剤漏れ防止テープ２８，２８の厚みは、ブレード部材２５の厚み以上であることが好ましい。さらに、現像剤漏れ防止テープ２８，２８の形状は、図示例では長方形であるが、ブレード部材２５の長手方向の両側の端部２５ａ，２５ａに密着可能な形状であれば特に制限はない。 The developer leakage prevention tapes 28, 28 constituting the developing blade 21 are disposed on the support member 22 in a state of being in close contact with both end portions 25 a, 25 a of the blade member 25 in the longitudinal direction. As a result, the developer existing between the developing blade 21 and the developing roller is more reliably prevented from leaking out of the developing region in the longitudinal direction of the developing blade 21 (the direction indicated by the arrow a in FIG. 3). .
The material of the developer leakage prevention tapes 28 and 28 is preferably a flexible material, and examples thereof include a microcell polymer sheet PORON manufactured by Roger Sinoac Co., Ltd. Further, the thickness of the developer leakage prevention tapes 28, 28 is preferably equal to or greater than the thickness of the blade member 25. Furthermore, the shape of the developer leakage prevention tapes 28, 28 is rectangular in the illustrated example, but there is no particular limitation as long as it can be in close contact with the ends 25a, 25a on both sides in the longitudinal direction of the blade member 25.

図４は、本発明の現像ブレードの他の実施形態を示す平面図であり、図５は図４に示される現像ブレードの断面図であり、（Ａ）はIII−III線矢視拡大断面図、（Ｂ）はIV−IV線矢視拡大断面図である。図４および図５に示される現像ブレード３１は、支持部材３２と、この支持部材３２の片面に、長手方向（図４に矢印ａで示される方向）の１つの端側部３２Ａに沿って形成されたブレード部材３５と、このブレード部材３５の長手方向の両側の端部３５ａ，３５ａに密着させて現像剤漏れ防止テープ３８，３８（図４では斜線を付して示している）を備えている。
現像ブレード３１を構成する支持部材３２は、端側部３２Ａの両側の端部３２ａ，３２ａの近傍に現像剤循環用切欠き部３３，３３を有している。 FIG. 4 is a plan view showing another embodiment of the developing blade of the present invention, FIG. 5 is a cross-sectional view of the developing blade shown in FIG. 4, and (A) is an enlarged cross-sectional view taken along line III-III. (B) is an IV-IV line arrow expanded sectional view. The developing blade 31 shown in FIGS. 4 and 5 is formed along one end side portion 32A in the longitudinal direction (the direction indicated by the arrow a in FIG. 4) on one side of the supporting member 32 and the supporting member 32. The blade member 35 is provided with developer leakage prevention tapes 38 and 38 (shown by hatching in FIG. 4) in close contact with both end portions 35a and 35a in the longitudinal direction of the blade member 35. Yes.
The support member 32 constituting the developing blade 31 has developer circulation notches 33 and 33 in the vicinity of the end portions 32a and 32a on both sides of the end side portion 32A.

また、ブレード部材３５は、現像剤循環用切欠き部３３，３３を越えて端側部３２Ａの両側の端部３２ａ，３２ａ近傍まで延設されており、現像剤循環用切欠き部３３，３３に対応した切欠き部３６，３６を有している。さらに、ブレード部材３５は、支持部材３２の端側部３２Ａと反対側の端側部３２Ｂ方向へ突設されたスカート部３７，３７を有している。そして、このスカート部３７，３７、および、ブレード部材３５の長手方向の両側の端部３５ａ，３５ａは、現像剤漏れ防止テープ３８，３８に密着している。
現像ブレード３１を構成する支持部材３２は、上述の現像ブレード１１の支持部材１２と同様とすることができ、ここでの説明は省略する。 Further, the blade member 35 extends beyond the developer circulation notches 33, 33 to the vicinity of the end portions 32a, 32a on both sides of the end side portion 32A, and the developer circulation notches 33, 33. Has notches 36 and 36 corresponding to the above. Further, the blade member 35 has skirt portions 37 and 37 projecting in the direction of the end side portion 32B opposite to the end side portion 32A of the support member 32. The skirt portions 37 and 37 and the end portions 35 a and 35 a on both sides in the longitudinal direction of the blade member 35 are in close contact with the developer leakage prevention tapes 38 and 38.
The supporting member 32 constituting the developing blade 31 can be the same as the supporting member 12 of the developing blade 11 described above, and a description thereof is omitted here.

現像ブレード３１を構成するブレード部材３５は、スカート部３７，３７を備えている他は、上述の現像ブレード１１のブレード部材１５と同様とすることができる。スカート部３７，３７は、図５（Ａ）に示されるように、ブレード部材３５よりも薄い部材である。また、スカート部３７，３７の形状は、その端部３７ａ，３７ａが、ブレード部材３５の長手方向の両側の端部３５ａ，３５ａと一直線をなすものであればよく、図示例のような方形状に限定されず、他の形状であってもよい。
現像ブレード３１を構成する現像剤漏れ防止テープ３８，３８は、上述の現像ブレード２１の現像剤漏れ防止テープ３８，３８と同様とすることができ、ここでの説明は省略する。 The blade member 35 constituting the developing blade 31 can be the same as the blade member 15 of the developing blade 11 described above except that the skirt portions 37 and 37 are provided. The skirt portions 37 and 37 are members thinner than the blade member 35 as shown in FIG. The shape of the skirt portions 37 and 37 may be any shape as long as the end portions 37a and 37a are aligned with the end portions 35a and 35a on both sides in the longitudinal direction of the blade member 35. However, other shapes may be used.
The developer leakage preventing tapes 38 and 38 constituting the developing blade 31 can be the same as the developer leakage preventing tapes 38 and 38 of the developing blade 21 described above, and a description thereof is omitted here.

このような現像ブレード３１は、ブレード部材３５と現像剤漏れ防止テープ３８との密着距離（図４にＬで示した距離）が、上述の現像ブレード２１におけるブレード部材２５と現像剤漏れ防止テープ２８との密着距離（図３にＬで示した距離）よりも長くなる。したがって、現像ブレードの使用中に、仮に、ブレード部材３５と現像剤漏れ防止テープ３８との間に、現像剤が入り込めるような微細な隙間が発生したとしも、この隙間の長さ（図４にＬで示した距離）が長いので、現像剤が隙間を図４の矢印ｂ方向に漏れることが防止され、現像剤の漏れ防止効果が大幅に向上する。   In such a developing blade 31, the contact distance (the distance indicated by L in FIG. 4) between the blade member 35 and the developer leakage prevention tape 38 is such that the blade member 25 and the developer leakage prevention tape 28 in the development blade 21 described above. Longer than the contact distance (distance indicated by L in FIG. 3). Therefore, even if a fine gap that allows the developer to enter between the blade member 35 and the developer leakage prevention tape 38 is generated during use of the developing blade, the length of the gap (see FIG. 4). Since the distance indicated by L) is long, the developer is prevented from leaking through the gap in the direction of the arrow b in FIG. 4, and the effect of preventing the developer from leaking is greatly improved.

上述の実施形態は例示であり、本発明はこれらの実施形態に限定されるものではない。
例えば、ブレード部材１５，２５，３５の断面形状は、上述の実施形態のものに限定されない。図６はブレード部材の他の断面形状を示す図２相当の断面図である。図６に示される現像ブレード１１′では、ブレード部材１５′は、現像ローラとの接触領域が曲面をなし、支持部材１２の端側部１２Ａと反対側の端側部１２Ｂ方向へ向って厚みは緩やかに減少するような形状となっている。また、図７はブレード部材の他の断面形状を示す図５相当の断面図である。図７に示される現像ブレード３１′では、ブレード部材３５′は、現像ローラとの接触領域が曲面をなし、支持部材３２の端側部３２Ａと反対側の端側部３２Ｂ方向へ向って厚みは緩やかに減少し、かつ、スカート部３７を有している。 The above-described embodiments are examples, and the present invention is not limited to these embodiments.
For example, the cross-sectional shape of the blade members 15, 25, and 35 is not limited to that of the above-described embodiment. FIG. 6 is a cross-sectional view corresponding to FIG. 2 showing another cross-sectional shape of the blade member. In the developing blade 11 ′ shown in FIG. 6, the blade member 15 ′ has a curved contact area with the developing roller, and has a thickness toward the end side portion 12 </ b> B opposite to the end side portion 12 </ b> A of the support member 12. The shape gradually decreases. FIG. 7 is a cross-sectional view corresponding to FIG. 5 showing another cross-sectional shape of the blade member. In the developing blade 31 ′ shown in FIG. 7, the blade member 35 ′ has a curved contact area with the developing roller, and has a thickness toward the end side portion 32 </ b> B opposite to the end side portion 32 </ b> A of the support member 32. It gradually decreases and has a skirt portion 37.

また、本発明の現像ブレードは、支持部材の両面にブレード部材を備えるものであってもよい。図８は、このような形態を示す図２相当の断面図である。図８に示される現像ブレード１１″では、支持部材１２の両面に、長手方向の１つの端側部１２Ａに沿って形成されたブレード部材１５，１５を備えている。この場合も、支持部材１２は、端側部１２Ａの両側の端部の近傍に現像剤循環用切欠き部１３，１３を有している。また、ブレード部材１５，１５は、それぞれ現像剤循環用切欠き部１３，１３を越えて端側部１２Ａの両側の端部近傍まで延設されている。そして、ブレード部材１５，１５には、それぞれ現像剤循環用切欠き部１３，１３に対応した切欠き部１６，１６が形成されている。   The developing blade of the present invention may be provided with blade members on both sides of the support member. FIG. 8 is a cross-sectional view corresponding to FIG. 8 includes blade members 15 and 15 formed along one end portion 12A in the longitudinal direction on both surfaces of the support member 12. The support member 12 is also provided in this case. 1 has developer circulation cutout portions 13 and 13 in the vicinity of both end portions of the end side portion 12 A. The blade members 15 and 15 have developer circulation cutout portions 13 and 13, respectively. The blade members 15 and 15 have notches 16 and 16 corresponding to the developer circulation notches 13 and 13, respectively, in the vicinity of both ends of the end side portion 12A. Is formed.

本発明の現像ブレードは、射出成形、トランスファ成形のいずれであっても製造することができる。
ここで、上述の現像ブレード３１を例として、射出成形による製造例を説明する。
図９および図１０は、射出成形により本発明の現像ブレードを製造する場合に使用する金型の一例を説明するための図であり、図９は上述の現像ブレード３１の図５（Ａ）に示される部位に相当する断面図であり、図１０は上述の現像ブレード３１の図５（Ｂ）に示される部位に相当する断面図である。 The developing blade of the present invention can be manufactured by either injection molding or transfer molding.
Here, a manufacturing example by injection molding will be described using the developing blade 31 described above as an example.
FIGS. 9 and 10 are views for explaining an example of a mold used when the developing blade of the present invention is manufactured by injection molding. FIG. 9 is a view of FIG. 5A of the developing blade 31 described above. FIG. 10 is a cross-sectional view corresponding to the portion shown in FIG. 5B of the developing blade 31 described above.

図９および図１０において、使用する金型４１は、上金型４２と、平らな型面を有する下金型４３とからなる。上金型４２は、ブレード部材３５を形成するためのキャビティ４５が設けられた型面とキャビティ４５に連通するゲート４７とを備えている。ゲート４７は、上述の現像ブレード３１のスカート部３７に該当する部位に配設されている。そして、キャビティ４５が支持部材３２で閉塞された状態で上金型４２と下金型４３とを型合わせして型締めする。その後、ゲート４７から成形材料を注入してキャビティ４５内を充填することにより、現像ブレード３１が製造される。   9 and 10, a mold 41 to be used includes an upper mold 42 and a lower mold 43 having a flat mold surface. The upper mold 42 includes a mold surface provided with a cavity 45 for forming the blade member 35, and a gate 47 communicating with the cavity 45. The gate 47 is disposed at a portion corresponding to the skirt portion 37 of the developing blade 31 described above. Then, the upper mold 42 and the lower mold 43 are matched with each other and the mold is clamped in a state where the cavity 45 is closed by the support member 32. Thereafter, the developing blade 31 is manufactured by injecting a molding material from the gate 47 to fill the cavity 45.

電子写真画像形成装置の現像装置に用いられる現像ブレードに利用可能である。   It can be used for a developing blade used in a developing device of an electrophotographic image forming apparatus.

本発明の現像ブレードの一実施形態を示す平面図である。It is a top view which shows one Embodiment of the image development blade of this invention. 図１に示される現像ブレードの断面図であり、（Ａ）はＩ−Ｉ線矢視拡大断面図、（Ｂ）はII−II線矢視拡大断面図である。2A and 2B are cross-sectional views of the developing blade shown in FIG. 1, in which FIG. 1A is an enlarged cross-sectional view taken along line II and FIG. 1B is an enlarged cross-sectional view taken along line II-II. 本発明の現像ブレードの他の実施形態を示す平面図である。It is a top view which shows other embodiment of the image development blade of this invention. 本発明の現像ブレードの他の実施形態を示す平面図である。It is a top view which shows other embodiment of the image development blade of this invention. 図４に示される現像ブレードの断面図であり、（Ａ）はIII−III線矢視拡大断面図、（Ｂ）はIV−IV線矢視拡大断面図である。FIG. 5 is a cross-sectional view of the developing blade shown in FIG. 4, (A) is an enlarged cross-sectional view taken along line III-III, and (B) is an enlarged cross-sectional view taken along line IV-IV. 本発明の現像ブレードの他の実施形態を示す図２相当の断面図である。FIG. 5 is a cross-sectional view corresponding to FIG. 2 showing another embodiment of the developing blade of the present invention. 本発明の現像ブレードの他の実施形態を示す図５相当の断面図である。FIG. 6 is a cross-sectional view corresponding to FIG. 5 showing another embodiment of the developing blade of the present invention. 本発明の現像ブレードの他の実施形態を示す図２相当の断面図である。FIG. 5 is a cross-sectional view corresponding to FIG. 2 showing another embodiment of the developing blade of the present invention. 本発明の現像ブレードの製造に使用する金型を説明するための図である。It is a figure for demonstrating the metal mold | die used for manufacture of the image development blade of this invention. 本発明の現像ブレードの製造に使用する金型を説明するための図である。It is a figure for demonstrating the metal mold | die used for manufacture of the image development blade of this invention. 現像装置の構造の一例を示す図である。It is a figure which shows an example of the structure of a developing device. 従来の現像ブレードの一例を示す斜視図である。It is a perspective view which shows an example of the conventional developing blade.

符号の説明Explanation of symbols

１１，２１，３１，１１′，１１″，３１′…現像ブレード
１２，２１，３２…支持部材
１２Ａ，２２Ａ，３２Ａ…端側部
１３，２３，３３…現像剤循環用切欠き部
１５，２５，３５，１５′，３５′…ブレード部材
１６，２６，３６…切欠き部
２８，３８…現像剤漏れ防止テープ
３７…スカート部 11, 21, 31, 11 ', 11 ", 31' ... developing blades 12, 21, 32 ... support members 12A, 22A, 32A ... end side portions 13, 23, 33 ... developer circulation notches 15,25 , 35, 15 ', 35' ... blade member 16, 26, 36 ... notch 28, 38 ... developer leakage prevention tape 37 ... skirt

Claims (3)

支持部材と、該支持部材の１つの端側部に沿って配設されたブレード部材とを備え、前記支持部材は前記端側部の両側の端部の近傍に現像剤循環用切欠き部を有し、前記ブレード部材は前記現像剤循環用切欠き部を越えて前記端側部の両側の端部近傍まで延設され、かつ、前記ブレード部材は前記現像剤循環用切欠き部に対応した切欠き部を有することを特徴とする現像ブレード。   A support member, and a blade member disposed along one end side of the support member, the support member having a developer circulation notch in the vicinity of both ends of the end side. The blade member extends beyond the developer circulation notch to the vicinity of both end portions of the end side portion, and the blade member corresponds to the developer circulation notch. A developing blade having a notch. 前記ブレード部材の長手方向の両側の端部に密着させて前記支持体上に現像剤漏れ防止テープを備えることを特徴とする請求項１に記載の現像ブレード。   2. The developing blade according to claim 1, further comprising a developer leakage prevention tape on the support in close contact with both ends of the blade member in a longitudinal direction. 前記ブレード部材は前記支持部材の前記端側部と反対側の方向に突設されたスカート部を有し、該スカート部と前記ブレード部材の長手方向の両側の前記端部とが前記現像剤漏れ防止テープに密着していることを特徴とする請求項２に記載の現像ブレード。   The blade member has a skirt portion projecting in a direction opposite to the end side portion of the support member, and the skirt portion and the end portions on both sides in the longitudinal direction of the blade member leak the developer. The developing blade according to claim 2, wherein the developing blade is in close contact with the prevention tape.
JP2007049204A 2007-02-28 2007-02-28 Developing blade Withdrawn JP2008216275A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009122384A (en) * 2007-11-14 2009-06-04 Bridgestone Corp Mold for developing blade and manufacturing method of developing blade
WO2010055640A1 (en) * 2008-11-14 2010-05-20 株式会社ブリヂストン Blade for oa equipment
JP2013233776A (en) * 2012-05-11 2013-11-21 Fujikura Rubber Ltd Mold for producing developing blade and method for producing developing blade using the same
CN103513547A (en) * 2012-06-28 2014-01-15 株式会社理光 Scraper blade construct, eikonogen limit member, developing unit, processing unit and image forming device
JP2015081957A (en) * 2013-10-21 2015-04-27 ブラザー工業株式会社 Development device

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009122384A (en) * 2007-11-14 2009-06-04 Bridgestone Corp Mold for developing blade and manufacturing method of developing blade
US8236229B2 (en) 2007-11-14 2012-08-07 Bridgestone Corporation Mold for development blade and method of producing development blade
WO2010055640A1 (en) * 2008-11-14 2010-05-20 株式会社ブリヂストン Blade for oa equipment
JP2010117666A (en) * 2008-11-14 2010-05-27 Bridgestone Corp Blade for oa
JP2013233776A (en) * 2012-05-11 2013-11-21 Fujikura Rubber Ltd Mold for producing developing blade and method for producing developing blade using the same
CN103513547A (en) * 2012-06-28 2014-01-15 株式会社理光 Scraper blade construct, eikonogen limit member, developing unit, processing unit and image forming device
CN103513547B (en) * 2012-06-28 2016-07-06 株式会社理光 Scraper blade construct, developing agent limiting member, developing unit, processing unit and image processing system
JP2015081957A (en) * 2013-10-21 2015-04-27 ブラザー工業株式会社 Development device
CN104570660A (en) * 2013-10-21 2015-04-29 兄弟工业株式会社 Developing device

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