JP2016151717A - Developing roller and developing device using the same, and image forming apparatus - Google Patents
Developing roller and developing device using the same, and image forming apparatus Download PDFInfo
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本発明は現像ローラ及びそれを用いた現像装置、画像形成装置に関するものである。 The present invention relates to a developing roller, a developing device using the developing roller, and an image forming apparatus.
複写機、プリンター、ファクシミリ及びこれらの複合機等の画像形成装置においては、従来から、静電潜像担持体に形成された静電潜像を現像する現像装置として、トナーとキャリアとを含む現像剤を現像ローラの外表面に担持させ、静電潜像担持体と対向する現像領域に搬送させて現像を行うものが知られている。 In image forming apparatuses such as copiers, printers, facsimiles, and composite machines thereof, conventionally, a developing device that develops an electrostatic latent image formed on an electrostatic latent image carrier is a developer including toner and a carrier. A developing agent is known in which an agent is carried on the outer surface of a developing roller and transported to a developing area facing an electrostatic latent image carrier.
このような現像装置では、一般に、現像剤を現像ローラの外表面に担持させて静電潜像担持体と対向する現像領域に搬送させる途中において、現像ローラと所要間隔を介して対向するように設けられた規制部材によって現像領域に搬送される現像剤量を規制するようにしている。 In such a developing device, generally, the developer is carried on the outer surface of the developing roller and conveyed to a developing area facing the electrostatic latent image carrier so as to face the developing roller with a required interval. The amount of the developer conveyed to the developing area is regulated by the provided regulating member.
また、現像ローラは、一般に、現像スリーブ、フランジ、軸受、マグネットローラで構成される。現像スリーブは、通常、アルミニウムなどの非磁性金属を筒状に加工されてなる。そして、現像領域への現像剤の搬送を安定化させるために、現像スリーブの外表面にサンドブラストによる凹凸が形成されていた。 The developing roller generally includes a developing sleeve, a flange, a bearing, and a magnet roller. The developing sleeve is usually formed by processing a nonmagnetic metal such as aluminum into a cylindrical shape. Then, in order to stabilize the transport of the developer to the development area, irregularities due to sandblasting were formed on the outer surface of the development sleeve.
ところが、サンドブラストによる現像スリーブ表面の凹凸は使用によって摩耗しやすかった。特に現像スリーブの材料としてアルミニウム材料を用いた場合には、摩耗が激しく耐久性の点で問題があった。 However, the irregularities on the surface of the developing sleeve due to sandblasting were easily worn by use. In particular, when an aluminum material is used as the material of the developing sleeve, there is a problem in terms of durability due to severe wear.
特許文献１では、現像剤の搬送性向上などを目的として、現像スリーブ表面に軸方向に延びるＶ字溝を円周方向に所定間隔で複数本形成するとともに、Ｖ字溝を回転方向に対して傾きを持たせる技術が提案されている。また、特許文献２では、現像剤の搬送性能を維持しピッチムラの発生を防止することを目的として、非磁性スリーブの表面にＶ字溝を形成し、その形状を現像剤中のキャリア粒径との関係で定める技術が提案されている。 In Patent Document 1, a plurality of V-shaped grooves extending in the axial direction are formed at predetermined intervals in the circumferential direction on the surface of the developing sleeve for the purpose of improving developer transportability and the like, and the V-shaped grooves are formed in the rotation direction. A technique for providing inclination has been proposed. Further, in Patent Document 2, a V-shaped groove is formed on the surface of the nonmagnetic sleeve for the purpose of maintaining the developer conveyance performance and preventing the occurrence of pitch unevenness, and the shape thereof is defined as the carrier particle size in the developer. The technology defined by the relationship is proposed.
特許文献１や特許文献２で提案されているようなＶ字溝を現像スリーブ表面に形成することによって、現像スリーブの耐久性は向上し現像剤の搬送性能は維持されるが、規制部材による現像領域への現像剤の搬送量の調整が難しくなるという新たな問題が生じる。 By forming a V-shaped groove as proposed in Patent Document 1 or Patent Document 2 on the surface of the developing sleeve, the durability of the developing sleeve is improved and the developer transport performance is maintained. There arises a new problem that it becomes difficult to adjust the transport amount of the developer to the region.
本発明はこのような従来の問題に鑑みてなされたものであり、その目的は、現像剤の搬送性能が長期間の使用によって大きく低下することがなく、しかも現像領域への現像剤の搬送量を容易に調整できる現像ローラを提供することにある。 The present invention has been made in view of such conventional problems, and an object of the present invention is to prevent the developer transport performance from greatly deteriorating due to long-term use and to transport the developer to the development area. It is an object of the present invention to provide a developing roller capable of easily adjusting the above.
また、本発明の他の目的は、長期間にわたって高画質な現像を実現できる現像装置及び画像形成装置を提供することにある。 Another object of the present invention is to provide a developing device and an image forming apparatus that can realize high-quality development over a long period of time.
前記目的を達成する本発明に係る現像ローラは、静電潜像担持体と対向する現像領域に現像剤を表面に担持して搬送する回転自在で筒状の現像スリーブと、この現像スリーブ内に設けられた磁界発生手段とを有する現像ローラであって、前記現像スリーブの表面に、第１のＶ字溝内にさらに第２のＶ字溝が形成された、軸方向に延びる２段Ｖ字溝が、円周方向に所定間隔で複数本形成されており、第１のＶ字溝の頂角αが第２のＶ字溝の頂角βよりも大きいことを特徴とする。 A developing roller according to the present invention that achieves the above object includes a rotatable cylindrical developing sleeve that carries and conveys a developer on the surface of a developing region facing the electrostatic latent image carrier, and the developing sleeve. A developing roller having a magnetic field generating means provided, wherein the developing sleeve has a two-stage V-shape extending in the axial direction, wherein a second V-shaped groove is further formed in the first V-shaped groove on the surface of the developing sleeve. A plurality of grooves are formed at predetermined intervals in the circumferential direction, and the apex angle α of the first V-shaped groove is larger than the apex angle β of the second V-shaped groove.
前記構成において、第１のＶ字溝の頂点と、第２のＶ字溝の頂点とが、前記現像スリーブの中心点を通る同じ直線上に位置する構成とするのが好ましい。 In the above configuration, it is preferable that the apex of the first V-shaped groove and the apex of the second V-shaped groove are positioned on the same straight line passing through the center point of the developing sleeve.
また、第１のＶ字溝の頂角αは９０°以上１８０°未満であるのが好ましい。 The apex angle α of the first V-shaped groove is preferably 90 ° or more and less than 180 °.
そしてまた、第２のＶ字溝の頂角βは６０°以上１２０°以下であるのが好ましい。 The apex angle β of the second V-shaped groove is preferably 60 ° or more and 120 ° or less.
前記構成において、第１のＶ字溝の頂点と前記現像スリーブの中心点とを通る直線上における前記現像スリーブ表面から第１のＶ字溝の頂点までの距離Ｄ１と、第２のＶ字溝の頂点と前記現像スリーブの中心点とを通る直線上における前記現像スリーブ表面から第２のＶ字溝の頂点までの距離Ｄ２とが下記式（１）を満足するのが好ましい。
Ｄ２−Ｄ１＞Ｄ１ ・・・・・・（１）
In the above configuration, a distance D1 from the surface of the developing sleeve to the vertex of the first V-shaped groove on a straight line passing through the vertex of the first V-shaped groove and the center point of the developing sleeve, and a second V-shaped groove It is preferable that a distance D2 from the surface of the developing sleeve to the vertex of the second V-shaped groove on a straight line passing through the vertex of the developing sleeve and the center point of the developing sleeve satisfies the following formula (1).
D2-D1> D1 (1)
また前記構成において、前記２段Ｖ字溝は前記現像スリーブの軸方向の全体にわたって形成されているのが好ましい。 In the above configuration, the two-stage V-shaped groove is preferably formed over the entire axial direction of the developing sleeve.
また前記構成において、前記現像スリーブの軸方向中央部と両端部との間で、且つ、円周方向に形成された前記２段Ｖ字溝間に、軸方向に延びる追加溝が形成されていてもよい。 Further, in the above-described configuration, an additional groove extending in the axial direction is formed between the central portion and both end portions of the developing sleeve in the axial direction and between the two-stage V-shaped grooves formed in the circumferential direction. Also good.
また前記構成において、前記現像スリーブの円周方向に形成された前記２段Ｖ字溝間に、軸方向に延びる追加溝がランダムに形成されていてもよい。 In the above configuration, additional grooves extending in the axial direction may be randomly formed between the two-stage V-shaped grooves formed in the circumferential direction of the developing sleeve.
前記目的を達成する本発明に係る現像装置は、前記のいずれかに記載の現像ローラを備えたことを特徴とする。 A developing device according to the present invention that achieves the above object is characterized by comprising any of the developing rollers described above.
また、前記目的を達成する本発明に係る画像形成装置は、前記記載の現像装置を備えたことを特徴とする。 In addition, an image forming apparatus according to the present invention that achieves the above object includes the above-described developing device.
本発明に係る現像ローラでは、現像剤の搬送性能が長期間の使用によって大きく低下することがなく、ピッチムラも発生しにくい。また、現像領域への現像剤の搬送量を容易に調整できる。これにより装置の生産性が向上する。 In the developing roller according to the present invention, the developer conveying performance is not greatly deteriorated by long-term use, and pitch unevenness hardly occurs. In addition, the amount of developer transported to the development area can be easily adjusted. This improves the productivity of the device.
本発明に係る現像装置及び画像形成装置では、長期間にわたって高画質な現像を実現できる。 In the developing device and the image forming apparatus according to the present invention, high-quality development can be realized over a long period of time.
以下、本発明に係る現像ローラ、現像装置及び画像形成装置を図に基づいて説明するが、本発明はこれらの実施形態に何ら限定されるものではない。 Hereinafter, the developing roller, the developing device, and the image forming apparatus according to the present invention will be described with reference to the drawings. However, the present invention is not limited to these embodiments.
図１は、本発明に係る画像形成装置の一例を示す概説図である。図１の画像形成装置は、タンデム型デジタルカラープリンター（以下、単に「プリンター」と記すことがある）である。もちろん、プリンターのほか、さらにスキャナを有する複写機、ファクシミリ又はそれらの機能を複合的に備えた複合機等にも本発明を適用することができる。なお、以下において、説明の対象である装置または部材がイエロー(Ｙ)、マゼンタ(Ｍ)、シアン(Ｃ)またはブラック(Ｂ)のいずれのものであるかを明確にする必要がある場合は、「(Ｙ)」、「(Ｍ)」、「(Ｃ)」、「(Ｂ)」の文字を符号に付加して説明し、それ以外の場合はそれら文字を省略して説明する。 FIG. 1 is a schematic diagram showing an example of an image forming apparatus according to the present invention. The image forming apparatus in FIG. 1 is a tandem digital color printer (hereinafter, simply referred to as “printer”). Of course, in addition to a printer, the present invention can also be applied to a copying machine having a scanner, a facsimile, or a multi-function machine having these functions combined. In the following, when it is necessary to clarify whether the device or member to be described is yellow (Y), magenta (M), cyan (C), or black (B), The description will be made by adding the characters “(Y)”, “(M)”, “(C)”, and “(B)” to the reference numerals, and otherwise omitting those characters.
プリンター１は、その内部のほぼ中央部に中間転写ベルト１１を備えている。中間転写ベルト１１は、ローラ１２，テンションローラ１３，ガイドローラ１４，１５の外周部に掛け渡されて反時計回りに回転駆動する。テンションローラ１３は、外側へスライド可能に取り付けられていると共に、押しバネＳによって中間転写ベルト１１の内側から外側に向かって付勢されている。これにより、中間転写ベルト１１は、常に張力がかかった状態となっている。 The printer 1 includes an intermediate transfer belt 11 at substantially the center of the inside thereof. The intermediate transfer belt 11 is wound around the outer periphery of the roller 12, the tension roller 13, and the guide rollers 14 and 15, and is driven to rotate counterclockwise. The tension roller 13 is slidably attached to the outside and is urged by the pressing spring S from the inside to the outside of the intermediate transfer belt 11. Thus, the intermediate transfer belt 11 is always in a tensioned state.
中間転写ベルト１１の下部水平部の下には、イエロー（Ｙ）、マゼンタ（Ｍ）、シアン（Ｃ）、ブラック（Ｂ）の各色にそれぞれ対応する４つの作像部２Ｙ，２Ｍ，２Ｃ，２Ｂが、中間転写ベルト１１に沿ってこの順に並んで配置されている。各作像部２Ｙ，２Ｍ，２Ｃ，２Ｂは、感光体ドラム（静電潜像担持体）２１Ｙ，２１Ｍ，２１Ｃ，２１Ｂをそれぞれ有している。各感光体ドラム２１Ｙ，２１Ｍ，２１Ｃ，２１Ｂの周囲には、その回転方向に沿って順に、帯電器２２Ｙ，２２Ｍ，２２Ｃ，２２Ｂと、プリントヘッド部２３Ｙ，２３Ｍ，２３Ｃ，２３Ｂと、現像装置２４Ｙ，２４Ｍ，２４Ｃ，２４Ｂと、クリーナ（クリーニング手段）２５Ｙ，２５Ｍ，２５Ｃ，２５Ｂとがそれぞれ配置されている。プリントヘッド部２３Ｙ，２３Ｍ，２３Ｃ，２３Ｂは、感光体ドラムの軸方向と平行な主走査方向に並べられた多数のＬＥＤから構成されている。 Below the lower horizontal portion of the intermediate transfer belt 11, four image forming portions 2Y, 2M, 2C, and 2B respectively corresponding to yellow (Y), magenta (M), cyan (C), and black (B) colors. Are arranged in this order along the intermediate transfer belt 11. Each image forming unit 2Y, 2M, 2C, 2B has a photosensitive drum (electrostatic latent image carrier) 21Y, 21M, 21C, 21B, respectively. Around each of the photosensitive drums 21Y, 21M, 21C, and 21B, the chargers 22Y, 22M, 22C, and 22B, the print head portions 23Y, 23M, 23C, and 23B, and the developing device 24Y are sequentially arranged along the rotation direction. , 24M, 24C, 24B and cleaners (cleaning means) 25Y, 25M, 25C, 25B are arranged, respectively. The print head portions 23Y, 23M, 23C, and 23B are composed of a large number of LEDs arranged in the main scanning direction parallel to the axial direction of the photosensitive drum.
そして、中間転写ベルト１１を挟んで、各感光体ドラム２１Ｙ，２１Ｍ，２１Ｃ，２１Ｂと対向する位置には、一次転写ローラ３０Ｙ，３０Ｍ，３０Ｃ，３０Ｂが設けられている。また、中間転写ベルト１１のローラ１２で支持された部分には、２次転写ローラ１６が圧接されている。２次転写ローラ１６と中間転写ベルト１１とのニップ部が２次転写領域１７となる。この２次転写領域１７において中間転写ベルト１１上に形成されたトナー像が、搬送されてきた用紙Ｐに転写される。 Further, primary transfer rollers 30Y, 30M, 30C, and 30B are provided at positions facing the respective photosensitive drums 21Y, 21M, 21C, and 21B with the intermediate transfer belt 11 interposed therebetween. A secondary transfer roller 16 is pressed against the portion of the intermediate transfer belt 11 supported by the roller 12. A nip portion between the secondary transfer roller 16 and the intermediate transfer belt 11 becomes a secondary transfer region 17. The toner image formed on the intermediate transfer belt 11 in the secondary transfer region 17 is transferred onto the conveyed paper P.
プリンター１に下部には、給紙カセット９１が着脱可能に配置されている。給紙カセット９１内に積載収容された用紙Ｐは、給紙ローラ９２の回転によって最上部のものから１枚ずつ引き出されて搬送路９３に送り出される。搬送路９３は、給紙カセット９１から、タイミングローラ対９４のニップ部、２次転写領域１７、および定着ユニット９５を通って排紙トレイ９８まで延びている。給紙カセット９１から送り出された用紙Ｐは、タイミングローラ対９４に搬送され、ここで所定のタイミングで２次転写領域１７に送り出される。 A paper feed cassette 91 is detachably disposed at the bottom of the printer 1. The sheets P stacked and housed in the sheet feeding cassette 91 are pulled out one by one from the uppermost one by the rotation of the sheet feeding roller 92 and sent out to the transport path 93. The conveyance path 93 extends from the paper feed cassette 91 to the paper discharge tray 98 through the nip portion of the timing roller pair 94, the secondary transfer region 17, and the fixing unit 95. The paper P sent out from the paper feed cassette 91 is conveyed to the timing roller pair 94 and is sent out to the secondary transfer area 17 at a predetermined timing.
定着ユニット９５は、中空円筒状で、ハロゲンヒータＨを内部に備えた定着ローラ９６と、この定着ローラ９６に圧接されて従動回転する加圧ローラ９７を備える。トナー像が２次転写された用紙Ｐが通過する、定着ローラ９６と加圧ローラ９７とのニップ部が、定着領域となる。 The fixing unit 95 has a hollow cylindrical shape, and includes a fixing roller 96 having a halogen heater H therein, and a pressure roller 97 that is pressed against the fixing roller 96 and rotates. A nip portion between the fixing roller 96 and the pressure roller 97 through which the sheet P on which the toner image is secondarily transferred passes is a fixing region.
このような構成のプリンター１の概略動作について説明する。まず、カラー画像を出力するフルカラーモードの場合、外部装置（例えばパソコン）からプリンター１の画像信号処理部（不図示）に画像信号が入力されると、画像信号処理部ではこの画像信号をイエロー、シアン、マゼンタ、ブラックに色変換したデジタル画像信号を作成し、この信号をプリントヘッド用ＬＥＤドライブ回路に伝達する。このドライブ回路は、入力されたデジタル信号に基づいて、各作像部２Ｙ，２Ｍ，２Ｃ，２Ｂのプリントヘッド部２３Ｙ，２３Ｍ，２３Ｃ，２３Ｂを発光させて露光を行う。この露光は、プリントヘッド部２３Ｙ，２３Ｍ，２３Ｃ，２３Ｂの順にそれぞれ時間差をもって行われる。これにより、各感光体ドラム２１Ｙ，２１Ｍ，２１Ｃ，２１Ｂの表面に各色用の静電潜像がそれぞれ形成される。 A schematic operation of the printer 1 having such a configuration will be described. First, in the full color mode for outputting a color image, when an image signal is input from an external device (for example, a personal computer) to an image signal processing unit (not shown) of the printer 1, the image signal processing unit converts the image signal to yellow, A digital image signal color-converted to cyan, magenta, and black is created, and this signal is transmitted to the LED drive circuit for the print head. This drive circuit performs exposure by causing the print head units 23Y, 23M, 23C, and 23B of the image forming units 2Y, 2M, 2C, and 2B to emit light based on the input digital signals. This exposure is performed with a time difference in the order of the print head portions 23Y, 23M, 23C, and 23B. Thereby, electrostatic latent images for the respective colors are formed on the surfaces of the respective photosensitive drums 21Y, 21M, 21C, and 21B.
各感光体ドラム２１Ｙ，２１Ｍ，２１Ｃ，２１Ｂ上に形成された静電潜像は、各現像装置２４Ｙ，２４Ｍ，２４Ｃ，２４Ｂによってそれぞれ現像されて各色のトナー像となる。そして、各色のトナー像は、各一次転写ローラ３０Ｙ，３０Ｍ，３０Ｃ，３０Ｂの作用により、図中反時計回りに回転する中間転写ベルト１１上に順次一次転写されて重ね合わせられる。 The electrostatic latent images formed on the photosensitive drums 21Y, 21M, 21C, and 21B are developed by the developing devices 24Y, 24M, 24C, and 24B, and become toner images of the respective colors. Then, the toner images of the respective colors are sequentially primary-transferred and superimposed on the intermediate transfer belt 11 that rotates counterclockwise in the drawing by the action of the primary transfer rollers 30Y, 30M, 30C, and 30B.
このようにして中間転写ベルト１１上に形成されたトナー像は、中間転写ベルト１１の移動にしたがって２次転写領域１７に達する。一方、給紙カセット９１から搬送路９３に送り出された用紙Ｐは、タイミングローラ対９４によって、トナー像が２次転写領域１７に達するタイミング合わせて２次転写領域１７へ搬送される。そして、２次転写ローラ１６にはトナーの帯電極性と逆極性の電圧が印加される。これにより、２次転写領域１７において、重ね合わされた各色トナー像は中間転写ベルト１１から用紙Ｐに一括して２次転写される。なお、２次転写後に中間転写ベルト１１上に残留するトナーは、不図示のベルトクリーナにより回収される。 The toner image formed on the intermediate transfer belt 11 in this way reaches the secondary transfer region 17 as the intermediate transfer belt 11 moves. On the other hand, the paper P sent out from the paper feed cassette 91 to the transport path 93 is transported to the secondary transfer region 17 by the timing roller pair 94 at the timing when the toner image reaches the secondary transfer region 17. A voltage having a polarity opposite to the charging polarity of the toner is applied to the secondary transfer roller 16. As a result, in the secondary transfer region 17, the superimposed color toner images are secondarily transferred collectively from the intermediate transfer belt 11 to the paper P. The toner remaining on the intermediate transfer belt 11 after the secondary transfer is collected by a belt cleaner (not shown).
トナー像が２次転写された用紙Ｐは、搬送路９３を通って定着ユニット９５に送られ、そこで定着領域を通過することによりトナー像が用紙Ｐに定着される。そして、用紙Ｐは排紙トレイ９８に排出される。 The sheet P onto which the toner image has been secondarily transferred is sent to the fixing unit 95 through the conveyance path 93, where the toner image is fixed on the sheet P by passing through the fixing region. Then, the paper P is discharged to the paper discharge tray 98.
次に、図１のプリンター１に搭載されている現像装置２４について説明する。図２は、現像装置２４Ｂの横断面図である。図２の現像装置２４Ｂは、磁性粒子からなるキャリアとトナーとを有する２成分系現像剤Ｄ（図３に図示）を用いて感光体ドラム２１Ｂの静電潜像を現像するものである。この現像装置２４Ｂは、複数の磁極を内蔵した回転自在の現像ローラ４と、水平方向に平行に配置され、互いに逆向きに現像剤を撹拌搬送する２本の撹拌羽根２４３，２４４と、２本の撹拌羽根２４３，２４４の間に形成され、両端部に開口部が形成された仕切り板２４５とを備える。 Next, the developing device 24 mounted on the printer 1 in FIG. 1 will be described. FIG. 2 is a cross-sectional view of the developing device 24B. The developing device 24B in FIG. 2 develops the electrostatic latent image on the photosensitive drum 21B using a two-component developer D (shown in FIG. 3) having a carrier made of magnetic particles and toner. The developing device 24B includes a rotatable developing roller 4 incorporating a plurality of magnetic poles, two stirring blades 243 and 244 arranged in parallel in the horizontal direction and stirring and transporting the developer in opposite directions. The partition plate 245 is formed between the stirring blades 243 and 244 and has openings at both ends.
２本の撹拌羽根２４３，２４４は、不図示の駆動機構によって互いに逆方向に回転する。現像剤は、撹拌羽根２４３が回転することによって紙面奥方向に、撹拌羽根２４４が回転することによって紙面手前方向に撹拌されながら搬送される。そして、撹拌羽根２４３，２４４の両端部において、仕切り板２４５の両端部に形成された開口部（不図示）を通って、一方の撹拌羽根から他方の撹拌羽根に現像剤は移動する。これにより現像剤は装置内を常に循環し撹拌される。現像装置内を撹拌されながら循環することによってトナーは所定値まで帯電する。 The two stirring blades 243 and 244 are rotated in opposite directions by a driving mechanism (not shown). The developer is conveyed while being agitated in the direction toward the back of the sheet by the rotation of the stirring blade 243 and toward the front of the sheet by the rotation of the stirring blade 244. The developer moves from one stirring blade to the other stirring blade through openings (not shown) formed at both ends of the partition plate 245 at both ends of the stirring blades 243 and 244. As a result, the developer is constantly circulated and stirred in the apparatus. The toner is charged to a predetermined value by circulating through the developing device while being stirred.
図３に、現像ローラ４と規制部材２４２、感光体ドラム２１との概略構成図、図４に、現像ローラ４の断面図をそれぞれ示す。図４に示すように、現像ローラ４は、マグネットローラ（磁界発生手段）４１と、マグネットローラ４１を収納する円筒状に現像スリーブ４２と、マグネットローラ４１と現像スリーブ４２とを接合するフランジ４３，４４とから構成される。現像スリーブ４２はアルミニウムなどの非磁性材料からなる。具体的には、Ａｌ−Ｍｇ−Ｓｉ系等のアルミニウム合金からなるものが好ましく、例えばＪＩＳ６０６３アルミニウム合金などが好適に使用される。マグネットローラ４１は、円柱状のマグネット部４１０と、マグネット部４１０の両端から突出する軸部４１１ａ，４１１ｂとが同一の磁性材料により一体形成されている。例えば、磁性材料は、磁性粉と磁性粉を結着固化させるためのバインダーとの混合物である。磁性粉としては、フェライト系、希土類系（ＳｍＣｏ系、ＮｄＦｅＢ系）、ＭｎＡｌＣ系、アルニコ系、ＳｍＦｅＮ系のものから選択することができ、また、バインダーとしては、熱可塑性樹脂、熱硬化性樹脂、低融点合金などを用いることができる。 FIG. 3 is a schematic configuration diagram of the developing roller 4, the regulating member 242, and the photosensitive drum 21, and FIG. 4 is a cross-sectional view of the developing roller 4. As shown in FIG. 4, the developing roller 4 includes a magnet roller (magnetic field generating means) 41, a cylindrical developing sleeve 42 that houses the magnet roller 41, a flange 43 that joins the magnet roller 41 and the developing sleeve 42, 44. The developing sleeve 42 is made of a nonmagnetic material such as aluminum. Specifically, an aluminum alloy such as Al—Mg—Si is preferable, and for example, JIS6063 aluminum alloy is preferably used. In the magnet roller 41, a cylindrical magnet portion 410 and shaft portions 411a and 411b protruding from both ends of the magnet portion 410 are integrally formed of the same magnetic material. For example, the magnetic material is a mixture of magnetic powder and a binder for binding and solidifying the magnetic powder. The magnetic powder can be selected from ferrite, rare earth (SmCo, NdFeB), MnAlC, alnico, and SmFeN, and the binder can be a thermoplastic resin, a thermosetting resin, A low melting point alloy or the like can be used.
現像ローラ４では、非磁性で円筒状の現像スリーブ４２が、マグネットローラ４１と同一中心軸となるように、マグネットローラ４１を内包している。そして、マグネットローラ４１の軸部４１１ａ，４１１ｂに滑り軸受け４３１，４４１がそれぞれ外嵌され、現像スリーブ４２の両端部にフランジ４３，４４が嵌め入れられることによって、マグネットローラ４１の端部とフランジ４３，４４との間に滑り軸受け４３１，４４１が挟み込まれている。 In the developing roller 4, the magnet roller 41 is included so that a nonmagnetic, cylindrical developing sleeve 42 has the same central axis as the magnet roller 41. Sliding bearings 431 and 441 are fitted on the shaft portions 411 a and 411 b of the magnet roller 41, and the flanges 43 and 44 are fitted on both ends of the developing sleeve 42. , 44 are sandwiched between sliding bearings 431, 441.
このような構造の現像ローラ４を現像装置２４Ｂに取り付ける場合、マグネットローラ４１は現像装置２４Ｂのハウジングに対して固定されると共に、現像スリーブ４２は回転可能に支持される。すなわち、マグネットローラ４１の軸部４１１ａ，４１１ｂをハウジングに固定すると共に、フランジ部４３，４４をハウジングに回転可能に固定する。そして、フランジ部４３を駆動部（不図示）に接続するように取り付ける。これにより、マグネットローラ４１が固定されると共に、現像スリーブ４２はマグネットローラ４１に対して相対的に回転する。 When the developing roller 4 having such a structure is attached to the developing device 24B, the magnet roller 41 is fixed to the housing of the developing device 24B, and the developing sleeve 42 is rotatably supported. That is, the shaft portions 411a and 411b of the magnet roller 41 are fixed to the housing, and the flange portions 43 and 44 are rotatably fixed to the housing. And it attaches so that the flange part 43 may be connected to a drive part (not shown). As a result, the magnet roller 41 is fixed and the developing sleeve 42 rotates relative to the magnet roller 41.
図３に示すように、現像スリーブ４２の表面には、複数本の２段Ｖ字溝４５が周方向に等間隔に形成されている。また、マグネットローラ４１には、現像磁極Ｎ１、搬送磁極Ｓ１、剥離磁極Ｎ２、汲み上げ磁極Ｎ３、ブレード磁極Ｓ２の５つの磁極が形成されている。現像スリーブ４２が図３の矢印方向に回転すると、汲み上げ磁極Ｎ３の磁力によって、撹拌羽根２４３から現像スリーブ４２へ現像剤Ｄが汲み上げられる。現像スリーブ４２の表面に担持された現像剤Ｄは現像領域へ搬送される。そして現像領域では、現像ローラ４にバイアス電圧が印加され、生じた現像電界により、帯電トナーが感光体ドラム２１上の静電潜像に移動して現像がなされる。その後、現像スリーブ４２上の現像剤Ｄは、搬送磁極Ｓ１によって装置内部に搬送され、剥離磁極Ｎ２によって現像スリーブ４２から剥離して、撹拌羽根２４３，２４４によって装置内を再び循環搬送され、現像に供していない現像剤Ｄと混合撹拌される。そして汲み上げ極Ｎ３によって、新たに現像剤Ｄが撹拌羽根２４３から現像スリーブ４２へ供給される。 As shown in FIG. 3, a plurality of two-stage V-shaped grooves 45 are formed on the surface of the developing sleeve 42 at equal intervals in the circumferential direction. The magnet roller 41 is formed with five magnetic poles: a developing magnetic pole N 1 , a conveying magnetic pole S 1 , a peeling magnetic pole N 2 , a pumping magnetic pole N 3 , and a blade magnetic pole S 2 . When the developing sleeve 42 is rotated in the arrow direction of FIG. 3, by the magnetic force of the magnetic pole N 3, the developer D is pumped from the stirring vane 243 to the developing sleeve 42. The developer D carried on the surface of the developing sleeve 42 is conveyed to the developing area. In the developing area, a bias voltage is applied to the developing roller 4, and the generated developing electric field moves the charged toner to the electrostatic latent image on the photosensitive drum 21 for development. Thereafter, the developer D on the developing sleeve 42 is conveyed into the apparatus by the conveying magnetic pole S 1 , separated from the developing sleeve 42 by the separation magnetic pole N 2 , and circulated and conveyed again inside the apparatus by the stirring blades 243 and 244, It is mixed and stirred with the developer D which has not been subjected to development. Then, the developer D is newly supplied from the stirring blade 243 to the developing sleeve 42 by the pumping pole N 3 .
図３において、現像スリーブ４２に担持された現像剤Ｄは、規制部材２４２と現像スリーブ４２との間隙を通過する際に、現像領域への搬送量が規制される。規制部材２４２と現像スリーブ４２との間隙が広いと、現像領域への現像剤Ｄの搬送量は多くなり、間隙が狭いと現像領域への現像剤Ｄの搬送量は少なくなる。Ｖ字溝が形成された従来の現像スリーブでは、規制部材２４２の高さ変化に対して現像剤Ｄの搬送量が敏感に反応するため、規制部材２４２の調整が難しく装置の生産性が低かった。 In FIG. 3, when the developer D carried on the developing sleeve 42 passes through the gap between the regulating member 242 and the developing sleeve 42, the transport amount to the developing region is regulated. When the gap between the regulating member 242 and the developing sleeve 42 is wide, the transport amount of the developer D to the developing area increases, and when the gap is narrow, the transport amount of the developer D to the developing area decreases. In the conventional developing sleeve in which the V-shaped groove is formed, the conveyance amount of the developer D reacts sensitively to the change in the height of the regulating member 242, so that it is difficult to adjust the regulating member 242 and the productivity of the apparatus is low. .
これに対し、本発明で使用する現像スリーブ４２では、第１のＶ字溝４５１内に第２のＶ字溝４５２がさらに形成された２段Ｖ字溝４５が施されている。図５に、現像スリーブ４２の全体図を、図６に、現像スリーブ４２の表面に形成された２段Ｖ字溝４５の拡大図を示す。図６（ａ），（ｂ）に示すように、２段Ｖ字溝４５は第１のＶ字溝４５１内に第２のＶ字溝４５２がさらに形成された形状を有し、図５に示すように、現像スリーブ４２の軸方向全体にわたって形成されている。また、２段Ｖ字溝４５は、現像スリーブ４２の円周方向に所定間隔で複数本形成されている。そして、図６（ｂ）に示すように第１のＶ字溝４５１の頂角αは、第２のＶ字溝４５２の頂角βよりも大きく設定されている。これにより、規制部材２４２と現像スリーブ４２との間隙で現像剤Ｄに必要以上の負荷がかかると現像スリーブ回転方向下流側に現像剤が戻り、規制部材２４２と現像スリーブ４２との間隙の変化に対する現像剤の搬送量変化が緩やかになる。また同時に、第２のＶ字溝４５２の頂角βが小さいので、第２のＶ字溝４５２によって現像剤の搬送性が確保される。第１のＶ字溝４５１と第２のＶ字溝４５２の頂角及び深さのバランスを調整することにより、規制部材２４２と現像スリーブ４２との間隙の変化に対する現像剤の搬送量変化を緩やかにしながら、規制部材２４２を通過する現像剤の搬送量を所望量とすることができる。 On the other hand, in the developing sleeve 42 used in the present invention, a two-stage V-shaped groove 45 in which a second V-shaped groove 452 is further formed in the first V-shaped groove 451 is provided. FIG. 5 is an overall view of the developing sleeve 42, and FIG. 6 is an enlarged view of the two-stage V-shaped groove 45 formed on the surface of the developing sleeve 42. As shown in FIGS. 6A and 6B, the two-stage V-shaped groove 45 has a shape in which a second V-shaped groove 452 is further formed in the first V-shaped groove 451. FIG. As shown, the developing sleeve 42 is formed over the entire axial direction. A plurality of two-stage V-shaped grooves 45 are formed at predetermined intervals in the circumferential direction of the developing sleeve 42. As shown in FIG. 6B, the apex angle α of the first V-shaped groove 451 is set to be larger than the apex angle β of the second V-shaped groove 452. As a result, when an unnecessarily large load is applied to the developer D in the gap between the regulating member 242 and the developing sleeve 42, the developer returns to the downstream side in the developing sleeve rotation direction, and the change in the gap between the regulating member 242 and the developing sleeve 42 is prevented. Changes in the developer transport amount become gradual. At the same time, since the apex angle β of the second V-shaped groove 452 is small, the second V-shaped groove 452 ensures developer transportability. By adjusting the balance between the apex angle and the depth of the first V-shaped groove 451 and the second V-shaped groove 452, the change in the developer conveyance amount with respect to the change in the gap between the regulating member 242 and the developing sleeve 42 is moderated. However, the transport amount of the developer passing through the regulating member 242 can be set to a desired amount.
第１のＶ字溝４５１の頂角αとしては９０°以上１８０°未満が好ましい。頂角αが９０°よりも小さいと現像剤の搬送性が大きくなりすぎるおそれがあるからである。また、第２のＶ字溝４５２の頂角βとしては６０°以上１２０°以下が好ましい。頂角βが６０°よりも小さいと、第２のＶ字溝４５２に現像剤が目詰まりし搬送性が低下するおそれがある一方、頂角βが１２０°よりも大きいと現像剤の搬送性が低下するおそれがあるからである。 The apex angle α of the first V-shaped groove 451 is preferably 90 ° or more and less than 180 °. This is because if the apex angle α is smaller than 90 °, the developer transportability may be too high. The apex angle β of the second V-shaped groove 452 is preferably 60 ° or more and 120 ° or less. If the apex angle β is smaller than 60 °, the developer may be clogged in the second V-shaped groove 452 and the transportability may be lowered. On the other hand, if the apex angle β is larger than 120 °, the transportability of the developer may be reduced. It is because there exists a possibility that it may fall.
また、第１のＶ字溝４５１の頂点Ｐ１と現像スリーブ４２の中心点Ｏとを通る直線上における現像スリーブ４２表面から第１のＶ字溝４５１の頂点Ｐ１までの距離Ｄ１と、第２のＶ字溝４５２の頂点Ｐ２と現像スリーブ４２の中心点Ｏとを通る直線上における現像スリーブ４２表面から第２のＶ字溝４５２の頂点Ｐ２までの距離Ｄ２とは前記式（１）を満足するのが好ましい。このような深さ設定とすることによって、規制部材２４２と現像スリーブ４２との間隙の変化に対する現像剤の搬送量変化が緩やかにすることができ、２段Ｖ字溝４５の本数で現像剤の搬送量を調整できる。例えば平均粒径３０ミクロンのキャリアを使用する場合、第２のＶ字溝４５２の深さ（Ｄ２−Ｄ１）は３０ミクロン以上とし、第１のＶ字溝４５１の深さＤ１はそれよりも浅くするのがよい。 Further, a distance D1 from the surface of the developing sleeve 42 to the vertex P1 of the first V-shaped groove 451 on a straight line passing through the vertex P1 of the first V-shaped groove 451 and the center point O of the developing sleeve 42, and the second The distance D2 from the surface of the developing sleeve 42 to the vertex P2 of the second V-shaped groove 452 on a straight line passing through the vertex P2 of the V-shaped groove 452 and the center point O of the developing sleeve 42 satisfies the above formula (1). Is preferred. By setting the depth as described above, the change in the developer conveyance amount with respect to the change in the gap between the regulating member 242 and the developing sleeve 42 can be moderated, and the number of the two-stage V-shaped grooves 45 can reduce the amount of developer. The conveyance amount can be adjusted. For example, when a carrier having an average particle diameter of 30 microns is used, the depth (D2-D1) of the second V-shaped groove 452 is 30 microns or more, and the depth D1 of the first V-shaped groove 451 is shallower than that. It is good to do.
現像スリーブ４２に形成する２段Ｖ字溝４５の本数に限定はないが、後述の実施例で示すように、２段Ｖ字溝４５の形成本数が多くなるほど規制部材２４２を通過する現像剤量は多くなるので、規制部材２４２を通過する現像剤量が所望量となるように、規制部材２４２と現像スリーブ４２との間隙と共に２段Ｖ字溝４５の形成本数を決定するのが望ましい。もちろん、２段Ｖ字溝４５の形成本数は、その他に現像スリーブ４２の直径などをも考慮して決定する必要がある。 The number of the two-stage V-shaped grooves 45 formed in the developing sleeve 42 is not limited. However, as shown in the embodiments described later, the amount of developer passing through the regulating member 242 increases as the number of the two-stage V-shaped grooves 45 formed increases. Therefore, it is desirable to determine the number of two-stage V-shaped grooves 45 formed together with the gap between the regulating member 242 and the developing sleeve 42 so that the amount of developer passing through the regulating member 242 becomes a desired amount. Of course, the number of the two-stage V-shaped grooves 45 to be formed needs to be determined in consideration of the diameter of the developing sleeve 42 and the like.
また、図７に示すように、現像スリーブ４２に形成する２段Ｖ字溝４５の内側面における角部及び頂角部を丸面としてもよい。このような構成によって２段Ｖ字溝４５内での現像剤の流れが滑らかになる。 Further, as shown in FIG. 7, corners and apex corners on the inner surface of the two-stage V-shaped groove 45 formed in the developing sleeve 42 may be round. With such a configuration, the developer flow in the two-stage V-shaped groove 45 becomes smooth.
図８に、２段Ｖ字溝４５の他の形態を示す部分拡大断面図を示す。この図に示す２段Ｖ字溝４５は、第１のＶ字溝４５１の頂点Ｐ１と第２のＶ字溝４５２の頂点Ｐ２とが、現像スリーブ４２の中心点Ｏとを通る同じ直線上にない形状、すなわち、第１のＶ字溝４５１と第２のＶ字溝４５２とが屈曲して接続した形状である。第１のＶ字溝４５１の頂点Ｐ１と現像スリーブ４２の中心点Ｏとを結んだ直線Ｌ１と、第２のＶ字溝４５２の頂点Ｐ２と現像スリーブ４２の中心点Ｏとを結んだ直線Ｌ２とが成す屈曲角度γが、直線Ｌ１を基準として現像スリーブ４２の回転方向上流側に大きくなると、通常、第２のＶ字溝４５２による現像剤の保持力が大きくなる。 FIG. 8 is a partial enlarged cross-sectional view showing another form of the two-stage V-shaped groove 45. The two-stage V-shaped groove 45 shown in this figure is on the same straight line where the vertex P1 of the first V-shaped groove 451 and the vertex P2 of the second V-shaped groove 452 pass through the center point O of the developing sleeve 42. In other words, the first V-shaped groove 451 and the second V-shaped groove 452 are bent and connected. A straight line L1 connecting the apex P1 of the first V-shaped groove 451 and the center point O of the developing sleeve 42, and a straight line L2 connecting the apex P2 of the second V-shaped groove 452 and the central point O of the developing sleeve 42 When the bending angle γ formed by and increases with respect to the straight line L1 on the upstream side in the rotation direction of the developing sleeve 42, normally, the developer holding force by the second V-shaped groove 452 increases.
図９に、本発明で使用する現像スリーブ４２の他の実施形態を示す。現像スリーブ４２の軸方向両端部では、現像スリーブ４２内に収納されているマグネットローラ４１による磁力線が集中し磁界が強くなり現像剤の搬送量が多くなりやすい。また、規制部材２４２の取り付け精度上、現像スリーブ４２の軸方向中央部は他の部分よりも規制部材２４２と現像スリーブ４２との間隙が広くなりやすい。そこで、図９に示すように、円周方向に所定間隔で形成された２段Ｖ字溝４５の間で、且つ、現像スリーブ４２の軸方向と両端部との間に、軸方向に延びる追加溝４６を形成する。これにより、追加溝４６が形成された部分の現像剤搬送量が増加して、現像スリーブ４２の軸方向両端部および中央部の現像剤搬送量とほぼ等しくなり軸方向に均一な現像剤搬送量とすることができる。追加溝４６の断面形状については特に限定はなくＶ字溝であってもよいし、２段Ｖ字溝４５であっても構わない。 FIG. 9 shows another embodiment of the developing sleeve 42 used in the present invention. At both ends in the axial direction of the developing sleeve 42, the magnetic lines of force by the magnet roller 41 accommodated in the developing sleeve 42 are concentrated, the magnetic field becomes strong, and the developer transport amount tends to increase. Further, in view of the mounting accuracy of the regulating member 242, the gap between the regulating member 242 and the developing sleeve 42 tends to be wider at the central portion in the axial direction of the developing sleeve 42 than at other portions. Therefore, as shown in FIG. 9, there is an additional extension extending in the axial direction between the two-stage V-shaped grooves 45 formed at predetermined intervals in the circumferential direction and between the axial direction and both ends of the developing sleeve 42. A groove 46 is formed. As a result, the developer conveyance amount in the portion where the additional groove 46 is formed increases, and is substantially equal to the developer conveyance amount at both end portions and the central portion of the developing sleeve 42 in the axial direction and is uniform in the axial direction. It can be. The cross-sectional shape of the additional groove 46 is not particularly limited, and may be a V-shaped groove or a two-stage V-shaped groove 45.
図１０に、本発明で使用する現像スリーブ４２のさらに他の実施形態を示す。現像スリーブ４２の円周方向に２段Ｖ字溝４５を形成することによって、規制部材２４２と現像スリーブ４２との間隙の変化に対する現像剤の搬送量変化を緩やかでき、また２段Ｖ字溝４５の本数で現像剤の搬送量を調整できるが、２段Ｖ字溝４５の有無による磁界強度に差が生じて画像濃度の周期的な変動（ピッチムラ）が生じることがある。そこで、図１０に示すように、円周方向に所定間隔で形成された２段Ｖ字溝４５の間に、軸方向に延びる複数本の追加溝４６をランダムに形成する。これにより、２段Ｖ字溝４５による磁界強度の差が緩和されピッチムラが抑制される。 FIG. 10 shows still another embodiment of the developing sleeve 42 used in the present invention. By forming the two-stage V-shaped groove 45 in the circumferential direction of the developing sleeve 42, the change in the developer conveyance amount with respect to the change in the gap between the regulating member 242 and the developing sleeve 42 can be moderated, and the two-stage V-shaped groove 45. The developer transport amount can be adjusted by this number, but a difference in magnetic field strength due to the presence or absence of the two-step V-shaped groove 45 may cause periodic fluctuations in image density (pitch unevenness). Therefore, as shown in FIG. 10, a plurality of additional grooves 46 extending in the axial direction are randomly formed between the two-stage V-shaped grooves 45 formed at predetermined intervals in the circumferential direction. As a result, the difference in magnetic field intensity due to the two-stage V-shaped groove 45 is alleviated and pitch unevenness is suppressed.
なお、追加溝４６をランダムに形成するとは、追加溝４６の軸方向の長さや軸方向の間隔を不規則に追加溝４６を形成することを意味する。追加溝４６の断面形状については特に限定はなくＶ字溝であってもよいし、２段Ｖ字溝４５であっても構わない。 In addition, forming the additional grooves 46 at random means that the additional grooves 46 are formed irregularly with respect to the axial length of the additional grooves 46 and the intervals in the axial direction. The cross-sectional shape of the additional groove 46 is not particularly limited, and may be a V-shaped groove or a two-stage V-shaped groove 45.
（実施例１）
図６に示した形状を有し、第１のＶ字溝（角度α：１３０°，深さＤ１：２０μｍ）及び第２のＶ字溝（角度β：９０°，深さ（Ｄ２−Ｄ１）：７０μｍ）からなる２段Ｖ字溝が円周方向に等間隔で６４本形成された現像スリーブを用い、規制部材と現像スリーブとの間隙を０．３ｍｍ、０．４ｍｍ、０．５ｍｍと変化させたときの、規制部材を通過した現像剤量を測定した。測定結果を表１及び図１１に示す。なお、本実施例および以下の実施例、比較例で使用した現像剤は、粒径３０μｍのキャリアと粒径６μｍのトナーとを混合したものであり、現像スリーブの直径は１６ｍｍであった。
Example 1
The first V-shaped groove (angle α: 130 °, depth D1: 20 μm) and the second V-shaped groove (angle β: 90 °, depth (D2-D1) having the shape shown in FIG. : Development sleeve in which 64 double-stage V-shaped grooves of 70 μm are formed at equal intervals in the circumferential direction, and the gap between the regulating member and the development sleeve is changed to 0.3 mm, 0.4 mm, and 0.5 mm. The amount of developer that passed through the regulating member was measured. The measurement results are shown in Table 1 and FIG. The developer used in this example and the following examples and comparative examples was a mixture of a carrier having a particle diameter of 30 μm and a toner having a particle diameter of 6 μm, and the diameter of the developing sleeve was 16 mm.
（実施例２）
実施例１と同じ形状の２段Ｖ字溝が円周方向に等間隔で４０本形成された現像スリーブを用いて、実施例１と同様にして規制部材を通過した現像剤量を測定した。測定結果を表１及び図１１に示す。
(Example 2)
The amount of developer that passed through the regulating member was measured in the same manner as in Example 1 using a developing sleeve in which 40 two-stage V-shaped grooves having the same shape as in Example 1 were formed at equal intervals in the circumferential direction. The measurement results are shown in Table 1 and FIG.
（比較例１）
Ｖ字溝（角度：９０°，深さ：９０μｍ）が円周方向に等間隔で６４本形成された現像スリーブを用いて、実施例１と同様にして規制部材を通過した現像剤量を測定した。測定結果を表１及び図１１に示す。
(Comparative Example 1)
Using a developing sleeve in which 64 V-shaped grooves (angle: 90 °, depth: 90 μm) are formed at equal intervals in the circumferential direction, the amount of developer passing through the regulating member is measured in the same manner as in Example 1. did. The measurement results are shown in Table 1 and FIG.
（比較例２）
比較例１と同じ形状のＶ字溝が円周方向に等間隔で４０本形成された現像スリーブを用いて、実施例１と同様にして規制部材を通過した現像剤量を測定した。測定結果を表１及び図１１に示す。
(Comparative Example 2)
Using a developing sleeve in which 40 V-shaped grooves having the same shape as Comparative Example 1 were formed at equal intervals in the circumferential direction, the amount of developer passing through the regulating member was measured in the same manner as in Example 1. The measurement results are shown in Table 1 and FIG.
（比較例３）
Ｖ字溝（角度：９０°，深さ：７０μｍ）が円周方向に等間隔で１００本形成された現像スリーブを用いて、実施例１と同様にして規制部材を通過した現像剤量を測定した。測定結果を表１及び図１１に示す。
(Comparative Example 3)
Using a developing sleeve having 100 V-shaped grooves (angle: 90 °, depth: 70 μm) formed at equal intervals in the circumferential direction, the amount of developer passing through the regulating member was measured in the same manner as in Example 1. did. The measurement results are shown in Table 1 and FIG.
表１及び図１１から明らかなように、規制部材と現像スリーブとの間隙を広くするほど規制部材を通過する現像剤量は増加するが、Ｖ字溝（１段）を形成した比較例１〜３の現像スリーブよりも２段Ｖ字溝４５を形成した実施例１，２の現像スリーブの方が、規制部材と現像スリーブとの間隙を広くしたときの現像剤量の増加割合は緩やかであった。また、実施例１と実施例２の現像スリーブでは、２段Ｖ字溝４５の本数の多い実施例１の現像スリーブの方が現像剤の搬送量が多かった。
以上から、規制部材の繊細な高さ調節によらず、現像スリーブに形成する２段Ｖ字溝４５の本数によって現像領域への現像剤の搬送量の調整を容易にできることがわかった。
As is clear from Table 1 and FIG. 11, the amount of developer passing through the regulating member increases as the gap between the regulating member and the developing sleeve is increased, but Comparative Examples 1 to 1 in which V-shaped grooves (one step) are formed. In the developing sleeves of Examples 1 and 2 in which the two-stage V-shaped groove 45 is formed, the rate of increase in the developer amount when the gap between the regulating member and the developing sleeve is widened is more gradual than that of the developing sleeve 3. It was. Further, in the developing sleeves of Example 1 and Example 2, the developer sleeve of Example 1 having a larger number of two-stage V-shaped grooves 45 has a larger amount of developer transport.
From the above, it has been found that the developer transport amount to the developing region can be easily adjusted by the number of the two-stage V-shaped grooves 45 formed in the developing sleeve, regardless of the delicate height adjustment of the regulating member.
本発明に係る現像ローラは、耐久性があってピッチムラも発生しにくい。また、規制部材の繊細な高さ調節によらず、現像スリーブに形成する２段Ｖ字溝の本数によって現像領域への現像剤の搬送量の調整を容易にでき、装置の生産性が向上し有用である。 The developing roller according to the present invention is durable and hardly causes pitch unevenness. In addition, regardless of the delicate height adjustment of the regulating member, the amount of developer transported to the development area can be easily adjusted by the number of two-stage V-shaped grooves formed in the developing sleeve, and the productivity of the apparatus is improved. Useful.
１ プリンター（画像形成装置）
４ 現像ローラ
α 第１のＶ字溝の頂角
β 第２のＶ字溝の頂角
Ｐ１ 第１のＶ字溝の頂点
Ｐ２ 第２のＶ字溝の頂点
１１ 転写ベルト
１６ ２次転写装置
２１ 感光体ドラム（静電潜像担持体）
２２ 帯電装置
２３ 露光装置
２４ 現像装置
３０ １次転写装置
４１ マグネットローラ（磁界発生手段）
４２ 現像スリーブ
４５ ２段Ｖ字溝
４６ 追加溝
２４１ｂ 現像スリーブ
２４２ 規制部材
４５１ 第１のＶ字溝
４５２ 第２のＶ字溝
1 Printer (image forming device)
4 Developing roller α First V-groove apex angle β Second V-groove apex angle P1 First V-groove apex P2 Second V-groove apex 11 Transfer belt 16 Secondary transfer device 21 Photosensitive drum (electrostatic latent image carrier)
22 Charging device 23 Exposure device 24 Development device 30 Primary transfer device 41 Magnet roller (magnetic field generating means)
42 Developing sleeve 45 Two-stage V-shaped groove 46 Additional groove 241b Developing sleeve 242 Restricting member 451 First V-shaped groove 452 Second V-shaped groove
Claims (10)
前記現像スリーブの表面に、第１のＶ字溝内にさらに第２のＶ字溝が形成された、軸方向に延びる２段Ｖ字溝が、円周方向に所定間隔で複数本形成されており、
第１のＶ字溝の頂角αが第２のＶ字溝の頂角βよりも大きい
ことを特徴とする現像ローラ。 A developing roller having a rotatable and cylindrical developing sleeve for carrying and transporting a developer on the surface of a developing area facing the electrostatic latent image carrier, and a magnetic field generating means provided in the developing sleeve. And
On the surface of the developing sleeve, a plurality of two-stage V-shaped grooves extending in the axial direction and having a second V-shaped groove formed in the first V-shaped groove are formed at predetermined intervals in the circumferential direction. And
A developing roller, wherein the apex angle α of the first V-groove is larger than the apex angle β of the second V-groove.
Ｄ２−Ｄ１＞Ｄ１ ・・・・・・（１） A distance D1 from the developing sleeve surface to the apex of the first V-groove on a straight line passing through the apex of the first V-groove and the center point of the developing sleeve, the apex of the second V-groove, and the The developing roller according to claim 1, wherein a distance D2 from the surface of the developing sleeve to the apex of the second V-shaped groove on a straight line passing through the center point of the developing sleeve satisfies the following expression (1).
D2-D1> D1 (1)
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