JP2016142990A - Conductive roller - Google Patents

Conductive roller Download PDF

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JP2016142990A
JP2016142990A JP2015020454A JP2015020454A JP2016142990A JP 2016142990 A JP2016142990 A JP 2016142990A JP 2015020454 A JP2015020454 A JP 2015020454A JP 2015020454 A JP2015020454 A JP 2015020454A JP 2016142990 A JP2016142990 A JP 2016142990A
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shaft portion
toner
blade
shaft
flange
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JP6427021B2 (en
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友則 ▲配▼島
友則 ▲配▼島
Tomonori Haijima
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Bridgestone Corp
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Bridgestone Corp
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Abstract

PROBLEM TO BE SOLVED: To solve the problem that, relating to a cartridge as a developing device that includes a toner storing container, a toner supply roller, and a development roller, a toner is easy to be affected by heat, for example, if a temperature in the cartridge rises due to the heat generated by rotation of a conductive roller, friction with other members, or the like, a disorder, for example, such as melting of toner occurs, resulting in possibility of leading to defective images.SOLUTION: Relating to a conductive roller which is formed by attaching a flange member containing a flange shaft to both ends of a cylindrical shaft part, a flange member 12 is provided with a wing 14 being separated from an inner peripheral surface of a shaft part 11. The conductive roller is a development roller 10 in which a toner sticking member for sticking toner is formed on an outer surface of the shaft part 11.SELECTED DRAWING: Figure 1

Description

本発明は、導電性ローラに関するものである。   The present invention relates to a conductive roller.

従来、現像ローラ等の導電性ローラを備えた、例えば、電子複写機等の画像形成装置が知られている。この画像形成装置には、通常、トナーが充填されたトナー収納容器から、トナー供給ローラを介して現像ローラに、更に現像ローラを介して感光ドラムに、トナーを供給して、感光ドラムに形成された静電潜像にトナーを付与する、トナー収納容器とトナー供給ローラと現像ローラとを含む、現像装置としてのカートリッジが設けられている。
ところで、トナーは熱による影響を受け易く、例えば、導電性ローラの回転や他部材との摩擦等で発生した熱によりカートリッジ内の温度が上昇すると、例えば、トナーが溶けてしまう等の不具合が発生し、その結果、画像不良等にも繋がる虞がある。 2. Description of the Related Art Conventionally, for example, an image forming apparatus such as an electronic copying machine provided with a conductive roller such as a developing roller is known. In this image forming apparatus, toner is usually formed on a photosensitive drum by supplying toner from a toner container filled with toner to a developing roller via a toner supply roller and further to a photosensitive drum via a developing roller. A cartridge as a developing device is provided that includes a toner container, a toner supply roller, and a developing roller for applying toner to the electrostatic latent image.
By the way, the toner is easily affected by heat. For example, when the temperature in the cartridge rises due to heat generated by rotation of the conductive roller or friction with other members, for example, a problem such as melting of the toner occurs. As a result, there is a risk of image defects.

そこで、この発明の目的は、温度上昇を十分に抑制することができる導電性ローラを提供することである。   Accordingly, an object of the present invention is to provide a conductive roller that can sufficiently suppress an increase in temperature.

上記目的を達成するため、この発明に係る導電性ローラは、円筒状の軸部を有し、該軸部の両端に、フランジ軸を有するフランジ部材を装着して形成される導電性ローラにおいて、前記フランジ部材に、前記軸部の内周面から離間させて羽根を設けたことを特徴とする。この発明に係る導電性ローラによれば、発生した熱の放熱を十分に行うことができるので、導電性ローラにおける温度上昇を十分に抑制することができる。   In order to achieve the above object, a conductive roller according to the present invention has a cylindrical shaft portion, and is formed by mounting flange members having flange shafts at both ends of the shaft portion. The flange member is provided with a blade separated from the inner peripheral surface of the shaft portion. According to the conductive roller of the present invention, the generated heat can be sufficiently dissipated, so that the temperature rise in the conductive roller can be sufficiently suppressed.

この発明の導電性ローラでは、前記羽根は、前記フランジ部材に設けられた、前記軸部の軸方向に延在する羽根軸の、外周面の羽根軸中心角が３０〜１８０度となる位置に複数個、前記軸部の軸方向両端のそれぞれの前記フランジ部材の間で周方向位置をずらして配置されていることが好ましい。この構成によれば、より効率良く、導電性ローラにおける温度上昇を十分に抑制することができる。   In the conductive roller according to the present invention, the blade is located at a position where the blade shaft central angle of the outer peripheral surface of the blade shaft provided in the flange member extending in the axial direction of the shaft portion is 30 to 180 degrees. It is preferable that a plurality of the flanges are disposed at different positions in the circumferential direction between the flange members at both axial ends of the shaft portion. According to this configuration, the temperature increase in the conductive roller can be sufficiently suppressed more efficiently.

この発明の導電性ローラでは、前記羽根は、前記軸部の内周面が露出する、前記フランジ部材より前記軸部の内部に入り込んだ位置に配置されていることが好ましい。この構成によれば、軸部に発生した熱の放熱をより強く行うことができるので、より効率良く、導電性ローラにおける温度上昇を十分に抑制することができる。   In the conductive roller according to the present invention, it is preferable that the blade is disposed at a position where the inner peripheral surface of the shaft portion is exposed and enters the shaft portion from the flange member. According to this configuration, since the heat generated in the shaft portion can be radiated more strongly, the temperature increase in the conductive roller can be sufficiently suppressed more efficiently.

この発明の導電性ローラは、前記軸部の外表面に、トナーを付着させるトナー付着部材が形成された現像ローラであることが好ましい。この構成によれば、温度上昇によるトナー溶けは、特に現像ローラで起き易いので、導電性ローラが現像ローラである場合に、本発明を適用するのが、特に効果的だからである。   The conductive roller of the present invention is preferably a developing roller in which a toner adhering member for adhering toner is formed on the outer surface of the shaft portion. According to this configuration, the toner melting due to the temperature rise is particularly likely to occur in the developing roller. Therefore, it is particularly effective to apply the present invention when the conductive roller is the developing roller.

この発明によれば、温度上昇を十分に抑制することができる導電性ローラを提供することができる。   According to the present invention, it is possible to provide a conductive roller that can sufficiently suppress an increase in temperature.

この発明の一実施の形態に係る導電性ローラの、一端側のみについて説明する、一部非断面部分を含む断面図である。It is sectional drawing including a partial non-cross-sectional part explaining only the one end side of the electroconductive roller which concerns on one Embodiment of this invention. 図１のフランジ部材を示し、（ａ）はフランジ軸側から見た外観図、（ｂ）は羽根及び羽根軸の一部非断面部分を含む断面図、（ｃ）は羽根側から見た外観図である。1 shows the flange member of FIG. 1, (a) is an external view as viewed from the flange shaft side, (b) is a cross-sectional view including part of the blade and the blade shaft, and (c) is an external view as viewed from the blade side. FIG.

以下、この発明を実施するための一形態について図面を参照して説明する。
この発明に係る導電性ローラは、例えば、電子複写機等の画像形成装置に用いられる導電性を有するローラであり、本実施形態では、例えば、現像ローラとして用いられる導電性ローラについて説明する。 Hereinafter, an embodiment for carrying out the present invention will be described with reference to the drawings.
The conductive roller according to the present invention is a conductive roller used in, for example, an image forming apparatus such as an electronic copying machine. In this embodiment, for example, a conductive roller used as a developing roller will be described.

図１に示す現像ローラ１０は、トナーが充填されたトナー収納容器（図示しない）の開口部に設けられて感光ドラム（図示しない）にトナーを供給するものであり、感光ドラムに形成された静電潜像にトナーを付与する現像装置としての、例えばカートリッジ（図示しない）に備えられている。図１に示すように、この現像ローラ１０は、円筒状の軸部１１と、軸部１１の両端に取り付けられたフランジ部材１２を有しており、軸部１１の外表面には、トナーを付着させる、例えばウレタン等の樹脂層からなるトナー付着部材（図示省略）が形成されている。   A developing roller 10 shown in FIG. 1 is provided in an opening of a toner container (not shown) filled with toner and supplies toner to a photosensitive drum (not shown). For example, a cartridge (not shown) is provided as a developing device for applying toner to the electrostatic latent image. As shown in FIG. 1, the developing roller 10 has a cylindrical shaft portion 11 and flange members 12 attached to both ends of the shaft portion 11, and toner is applied to the outer surface of the shaft portion 11. A toner adhering member (not shown) made of a resin layer such as urethane is attached.

本実施形態の軸部１１は、例えば、アルミニウム製の両端が開口する円筒体（スリーブ）からなり、各開口部には、フランジ部材１２が嵌合状態で挿入又は圧入されている。フランジ部材１２は、必要に応じ、接着剤を用いて軸部１１に接着固定される。
本実施形態のフランジ部材１２は、例えば、導電グレードの樹脂からなる円筒体状に形成されて、一端側に端面中心軸方向外側に突出するフランジ軸１３を有すると共に他端側を開口としている。導電グレードの樹脂としては、例えば、ポリカーボネートやポリアセタールが用いられる。 The shaft portion 11 of the present embodiment is made of, for example, a cylindrical body (sleeve) made of aluminum with both ends opened, and a flange member 12 is inserted or press-fitted into each opening portion in a fitted state. The flange member 12 is bonded and fixed to the shaft portion 11 using an adhesive as necessary.
The flange member 12 of the present embodiment is formed in a cylindrical shape made of, for example, a conductive grade resin. The flange member 12 has a flange shaft 13 projecting outward in the end surface central axis direction at one end side and an opening at the other end side. As the conductive grade resin, for example, polycarbonate or polyacetal is used.

フランジ軸１３は、現像装置に現像ローラ１０を装着する際、現像ローラ１０の軸方向一端側のフランジ軸１３が、軸受け（図示しない）に回転自在に軸支されると共に、現像ローラ１０の軸方向他端側のフランジ軸１３から回転駆動部（図示しない）の駆動力が伝達されるように、配置される。フランジ軸１３に駆動力が伝達されると、現像ローラ１０は、その軸線周りに回転（自転）する。なお、図１は、現像ローラ１０の軸方向の一方側のみを破断した図である。
本実施形態のフランジ軸１３には、軸中心線に沿ってフランジ軸１３を貫通する貫通孔１３ａが開けられており、この貫通孔１３ａを介して、フランジ部材１２により両端開口が塞がれた軸部１１の内部に、軸部１１の外部の気体（通常は空気。以下、空気として説明する）を取り込むことができる。 When the developing roller 10 is mounted on the developing device, the flange shaft 13 is rotatably supported by a bearing (not shown) on the flange shaft 13 on one end side in the axial direction of the developing roller 10 and the shaft of the developing roller 10. It arrange | positions so that the driving force of a rotational drive part (not shown) may be transmitted from the flange shaft 13 of a direction other end side. When the driving force is transmitted to the flange shaft 13, the developing roller 10 rotates (spins) around the axis. 1 is a diagram in which only one side of the developing roller 10 in the axial direction is broken.
The flange shaft 13 of the present embodiment has a through hole 13a penetrating the flange shaft 13 along the axial center line, and the opening at both ends is blocked by the flange member 12 through the through hole 13a. A gas (usually air, which will be described as air hereinafter) outside the shaft portion 11 can be taken into the shaft portion 11.

このフランジ部材１２には、軸部１１の内周面から離間させて羽根１４が設けられており、図２に示すように、羽根１４は、フランジ部材１２に設けられた、軸部１１の軸（回転軸）方向に延在する羽根軸１４ａの、外周面の、羽根軸中心角が３０〜１８０度となる位置に複数個、図示はしないが、軸部１１の軸方向両端のそれぞれのフランジ部材１２の間で周方向位置をずらして、即ち、軸部１１の軸方向から見て両端部の羽根１４が重ならないように、配置されている。   The flange member 12 is provided with a blade 14 spaced from the inner peripheral surface of the shaft portion 11. As shown in FIG. 2, the blade 14 is a shaft of the shaft portion 11 provided on the flange member 12. A plurality of flange shafts 14a extending in the (rotation axis) direction at positions on the outer peripheral surface where the blade shaft central angle is 30 to 180 degrees, although not shown, are flanges at both ends of the shaft portion 11 in the axial direction. The circumferential positions of the members 12 are shifted, that is, the blades 14 at both ends are arranged so as not to overlap each other when viewed from the axial direction of the shaft portion 11.

羽根１４が配置される、３０〜１８０度の羽根軸中心角は、羽根軸１４ａの周方向に隣り合う羽根１４の成す角度であり、各羽根１４が等間隔（各羽根１４の羽根軸中心角が等角度）で隣接することが望ましいが、等間隔でなくても良い。本実施形態では、各羽根１４の羽根軸中心角は、例えば、４枚の羽根１４が等間隔（等角度）で隣接する９０度である。なお、羽根軸中心角は、３０度未満の場合、羽根１４が多すぎ重くなって風が起き難く、１８０度を超える場合、効果的な風を殆ど起こすことができない。   The blade axis central angle of 30 to 180 degrees at which the blades 14 are disposed is an angle formed by the blades 14 adjacent to each other in the circumferential direction of the blade shaft 14a. Are adjacent at an equal angle), but they need not be equally spaced. In the present embodiment, the blade axis central angle of each blade 14 is, for example, 90 degrees in which the four blades 14 are adjacent at equal intervals (equal angles). When the blade axis central angle is less than 30 degrees, the blades 14 are too heavy and heavy, making it difficult for wind to occur, and when exceeding 180 degrees, almost no effective wind can be generated.

この羽根１４は、現像ローラ１０の回転（自転）時、フランジ部材１２に設置された羽根軸１４ａの回転（自転）と共に羽根軸１４ａ周りに回転し、それに伴って、軸部１１の内部空間には、各羽根１４による軸部１１の軸方向への空気の流れと共に、各羽根１４が軸部１１の内周面から離間させて設けられていることから、各羽根１４による羽根軸１４ａから軸部１１の内周面側へと押し出されるような、軸部１１の軸方向に垂直な方向への空気の流れａ（図中、矢印ａ参照）ができる。   When the developing roller 10 rotates (rotates), the blade 14 rotates around the blade shaft 14 a together with the rotation (rotation) of the blade shaft 14 a installed on the flange member 12, and accordingly, in the internal space of the shaft portion 11. Since each blade 14 is provided apart from the inner peripheral surface of the shaft portion 11 together with the flow of air in the axial direction of the shaft portion 11 by each blade 14, the shaft from the blade shaft 14 a by each blade 14. An air flow “a” (see arrow “a” in the figure) in a direction perpendicular to the axial direction of the shaft portion 11, which is pushed out toward the inner peripheral surface side of the portion 11, can be performed.

図１及び図２に示すように、本実施形態の羽根軸１４ａは、フランジ部材１２の他端側（フランジ軸１３が設けられていない側）の内部に、フランジ部材１２の開口面中心を通る軸部１１の軸方向に延在して設置されており、羽根軸１４ａの外周面とフランジ部材１２の内周面の間に架け渡された複数（本実施形態では、一例として４本）のリブ１４ｂにより支持されている。フランジ部材１２の内部にリブ１４ｂに支持された羽根軸１４ａを設置したことにより、フランジ部材１２の内部には、複数のリブ１４ｂのリブ間隙間（周方向隣接リブ間空間）が形成されることになる。このリブ間隙間（周方向隣接リブ間空間）は、フランジ部材１２に開けられた、フランジ部材１２の外部と内部を連通する複数（本実施形態では、一例として４個）の連通孔１２ａを介して、フランジ部材１２の外部と連通する。   As shown in FIGS. 1 and 2, the blade shaft 14 a according to the present embodiment passes through the center of the opening surface of the flange member 12 inside the other end side (the side where the flange shaft 13 is not provided) of the flange member 12. A plurality of (four in this embodiment, as an example) bridged between the outer peripheral surface of the blade shaft 14a and the inner peripheral surface of the flange member 12 are installed extending in the axial direction of the shaft portion 11. It is supported by the rib 14b. By installing the blade shaft 14a supported by the ribs 14b inside the flange member 12, gaps between ribs (spaces between adjacent ribs in the circumferential direction) of the plurality of ribs 14b are formed inside the flange member 12. become. The gap between ribs (space between adjacent ribs in the circumferential direction) is formed in a plurality of (four in this embodiment, for example) communication holes 12 a that are opened in the flange member 12 and communicate with the outside and the inside of the flange member 12. Thus, the flange member 12 communicates with the outside.

本実施形態の羽根１４は、図１に示すように、矩形状（例えば、羽根軸１４ａの延在方向に長い長方形状）或いはその他の形状（例えば、半円形状や三角形状）の板体に形成されており、その板体の軸部１１の内周面側に位置する、軸部１１の径方向の先端部が、軸部１１の内周面との間に隙間を有するように、即ち、軸部１１の内周面から離間させて配置されている。   As shown in FIG. 1, the blade 14 of the present embodiment is a rectangular (for example, a rectangle that is long in the extending direction of the blade shaft 14 a) or other shape (for example, a semicircular shape or a triangular shape). Formed so that the distal end portion in the radial direction of the shaft portion 11 located on the inner peripheral surface side of the shaft portion 11 of the plate body has a gap between the inner peripheral surface of the shaft portion 11, that is, The shaft portion 11 is disposed away from the inner peripheral surface.

羽根１４を軸部１１の内周面から離間させることで、軸部１１のフランジ部材１２が装着された両端部側には、羽根１４の軸部１１の径方向の先端部と軸部１１の内周面との間に、内周面全周にわたる隙間（内周面空間）が確保される。この隙間が確保されることで、フランジ部材１２の連通孔１２ａから、複数のリブ１４ｂのリブ間隙間（隣接リブ間空間）を介して、内周面全周にわたる隙間（内周面空間）に繋がる、空気流通路ｂ（図中、矢印ｂ参照）が形成される。   By separating the blade 14 from the inner peripheral surface of the shaft portion 11, the radial tip of the shaft portion 11 of the blade 14 and the shaft portion 11 on the both end sides of the shaft portion 11 where the flange member 12 is mounted. A gap (inner circumferential surface space) is ensured between the inner circumferential surface and the entire inner circumferential surface. By securing this gap, the gap (inner circumferential surface space) extends from the communication hole 12a of the flange member 12 to the entire inner circumferential surface via the gaps between the ribs 14b (spaces between adjacent ribs). The connected air flow passage b (see arrow b in the figure) is formed.

この空気流通路が形成されることにより、現像ローラ１０の回転（自転）時に発生する、各羽根１４によって軸部１１の内周面側へと押し出されるような空気の流れが、更に、空気流通路を経て軸部１１の内部を移動することになる。それに伴い、フランジ部材１２の連通孔１２ａを介して、軸部１１の内部へ、軸部１１の外部の空気が導入されることになり、軸部１１の内部へ導入された空気によって、現像ローラ１０の回転（自転）に伴い上昇した軸部１１の内部の温度を低下させることができ、或いは温度を上昇し難くさせることができる。   By forming this air flow passage, the air flow that is generated when the developing roller 10 rotates (rotates) and is pushed out by the blades 14 toward the inner peripheral surface side of the shaft portion 11 is further reduced. The inside of the shaft portion 11 moves through the path. Accordingly, air outside the shaft portion 11 is introduced into the shaft portion 11 through the communication hole 12 a of the flange member 12, and the developing roller is driven by the air introduced into the shaft portion 11. The temperature inside the shaft portion 11 that has risen with the rotation (rotation) of 10 can be lowered, or the temperature can be made difficult to rise.

つまり、現像ローラ１０において、現像ローラ１０の回転（自転）時に生じた空気の流れにより、現像ローラ１０の回転（自転）によって発生した熱の放熱を十分に行って、現像ローラにおける温度上昇を確実且つ十分に抑制することができる。
なお、フランジ軸１３を貫通する貫通孔１３ａの軸部１１側開口から離間して、羽根軸１４ａ及びリブ１４ｂを設け、貫通孔１３ａの軸部１１側開口を閉じることなく開口させた場合、貫通孔１３ａを介して、軸部１１の内部へ軸部１１の外部の空気が導入されることになるので、フランジ部材１２に連通孔１２ａを設けなくても良いが、更に、連通孔１２ａを設けても良い。 That is, in the developing roller 10, the heat generated by the rotation (autorotation) of the developing roller 10 is sufficiently radiated by the air flow generated when the developing roller 10 rotates (autorotation), and the temperature rise in the developing roller is ensured. And it can fully suppress.
When the blade shaft 14a and the rib 14b are provided apart from the shaft portion 11 side opening of the through hole 13a penetrating the flange shaft 13, and the shaft portion 11 side opening of the through hole 13a is opened without closing, the through hole 13a Since air outside the shaft portion 11 is introduced into the shaft portion 11 through the hole 13a, it is not necessary to provide the communication hole 12a in the flange member 12, but further, a communication hole 12a is provided. May be.

また、羽根１４は、現像ローラ１０の回転（自転）時に羽根１４が発生させる空気の流れが軸部１１に直接当たる位置に配置されている。本実施形態の羽根１４は、その軸部１１の軸方向の少なくとも一部（本実施形態では、全部）が、軸部１１の軸方向両端に挿入されたフランジ部材１２に掛からない位置、即ち、軸部１１の内周面が露出する、フランジ部材１２より軸部１１の内部（軸方向内側）に入り込んだ位置に配置されている。これにより、各羽根１４によって軸部１１の内周面側へと押し出されるような空気の流れａ（図１矢印ａ参照）を、フランジ部材１２の上からでなく、直接、軸部１１の内周面に吹き付けることができるので、熱を持ち易い軸部１１の内周面を、より効率良く冷やすことができ、或いは温度を上昇し難くすることができる。   The blade 14 is disposed at a position where the air flow generated by the blade 14 directly contacts the shaft portion 11 when the developing roller 10 rotates (rotates). The blade 14 of the present embodiment has a position where at least a part of the shaft portion 11 in the axial direction (all in the present embodiment) does not hook the flange members 12 inserted at both ends of the shaft portion 11 in the axial direction, that is, It arrange | positions in the position which penetrated the inside (axial direction inner side) of the shaft part 11 from the flange member 12, the inner peripheral surface of the shaft part 11 is exposed. As a result, the air flow a (see arrow a in FIG. 1) that is pushed out by the blades 14 toward the inner peripheral surface of the shaft portion 11 is not directly on the flange member 12 but directly inside the shaft portion 11. Since it can spray on a surrounding surface, the inner peripheral surface of the axial part 11 which is easy to have heat can be cooled more efficiently, or temperature can be made hard to raise.

羽根１４の、軸部１１の軸方向全部を、フランジ部材１２より軸部１１の軸方向内側へ配置する場合、フランジ部材１２にできるだけ近い位置に羽根１４を配置することが望ましい。
この羽根１４の配置は、例えば、フランジ部材１２が取り付けられる、軸部１１の端部側の、軸部１１の全長の１５％の長さの範囲とすることが好ましいが、軸部１１の端部近傍に限らず、軸部１１の軸方向任意の位置、即ち、熱発生源に応じた位置とすることができる。これにより、現像ローラ１０等の導電性ローラにおいて発生した熱に対し、導電性ローラの回転（自転）時に生じた空気の流れにより、温度上昇を十分に抑制することができる。 When the entire axial direction of the shaft portion 11 of the blade 14 is disposed inward of the shaft portion 11 from the flange member 12, it is desirable to dispose the blade 14 at a position as close as possible to the flange member 12.
The arrangement of the blades 14 is preferably within a range of 15% of the total length of the shaft portion 11 on the end portion side of the shaft portion 11 to which the flange member 12 is attached. Not only in the vicinity of the part, but also in the axial direction of the shaft part 11, that is, a position corresponding to the heat generation source. As a result, an increase in temperature can be sufficiently suppressed by the flow of air generated when the conductive roller rotates (spins) against heat generated in the conductive roller such as the developing roller 10.

本実施形態の現像ローラ１０によれば、現像ローラ１０の回転（自転）時、フランジ部材１２が装着された軸部１１の両端部近傍の内部温度を効率的に低下させ、或いは上昇し難くさせることができるので、前述の、現像ローラ１０を備えたカートリッジ内に、現像ローラ１０の両端部に圧接する状態でシール部材が設けられた構成において、特に、効果的な対応が可能になる。
即ち、例えば、トナーが充填されたトナー収納容器から、トナー供給ローラを介して現像ローラに、更に現像ローラを介して感光ドラムに、トナーを供給して、感光ドラムに形成された静電潜像にトナーを付与する現像装置においては、トナー収納容器と現像ローラの隙間からトナーが漏れてローラ軸方向へと拡散しないよう、隙間を防ぐように、現像ローラの両端部に圧接する状態でシール部材が設けられているものがある。
このように、現像ローラの両端部に圧接する状態でシール部材が設けられていると、現像ローラの回転（自転）時、シール部材と現像ローラが摺接して摩擦熱が発生してしまい、発生した熱によりトナーが溶けてしまう虞もあったが、本実施形態の現像ローラ１０によれば、シール部材と現像ローラ１０が摺接する部分、即ち、現像ローラの端部の熱を、効果的に放出し或いは低下させることができるので、たとえ、摩擦熱が発生したとしても、その熱によりトナーが溶けてしまうことを防ぐことができる。 According to the developing roller 10 of the present embodiment, when the developing roller 10 rotates (autorotates), the internal temperature in the vicinity of both end portions of the shaft portion 11 to which the flange member 12 is attached is efficiently lowered or hardly raised. Therefore, in the above-described configuration in which the seal member is provided in a state in which the cartridge is provided with the developing roller 10 so as to be in pressure contact with both end portions of the developing roller 10, particularly effective measures can be taken.
That is, for example, toner is supplied from a toner container filled with toner to a developing roller via a toner supply roller, and further to a photosensitive drum via a developing roller, so that an electrostatic latent image formed on the photosensitive drum is formed. In the developing device for applying toner to the seal member, the seal member is pressed against both ends of the developing roller so as to prevent the toner from leaking from the gap between the toner container and the developing roller and diffusing in the roller axial direction. Some are provided.
As described above, when the seal member is provided in pressure contact with both ends of the developing roller, when the developing roller rotates (spins), the seal member and the developing roller are slidably contacted to generate frictional heat. However, according to the developing roller 10 of this embodiment, the heat at the end where the seal member and the developing roller 10 are in slidable contact, that is, the end of the developing roller is effectively reduced. Since it can be released or lowered, even if frictional heat is generated, it is possible to prevent the toner from being melted by the heat.

つまり、フランジ部材１２に羽根１４を設けたことにより、現像ローラ１０の回転（自転）に伴って軸部１１の内部における空気の流れを作ることができ、その結果、軸部１１の内部の温度を低下させ或いは温度上昇し難くさせることができるので、軸部１１が冷却され、それに伴い軸部１１の外表面の例えばウレタン層も冷却されることになり、トナーへの熱負荷を軽減することができる。   That is, by providing the blades 14 on the flange member 12, it is possible to create an air flow inside the shaft portion 11 as the developing roller 10 rotates (rotates), and as a result, the temperature inside the shaft portion 11. As a result, the shaft portion 11 is cooled and, for example, the urethane layer on the outer surface of the shaft portion 11 is also cooled, thereby reducing the thermal load on the toner. Can do.

１０：現像ローラ（導電性ローラ）、 １１：軸部、 １２：フランジ部材、 １２ａ：連通孔、 １３：フランジ軸、 １３ａ：貫通孔、 １４：羽根、 １４ａ：羽根軸、 １４ｂ：リブ。   10: developing roller (conductive roller), 11: shaft portion, 12: flange member, 12a: communication hole, 13: flange shaft, 13a: through hole, 14: blade, 14a: blade shaft, 14b: rib.

Claims (4)

円筒状の軸部を有し、該軸部の両端に、フランジ軸を有するフランジ部材を装着して形成される導電性ローラにおいて、
前記フランジ部材に、前記軸部の内周面から離間させて羽根を設けたことを特徴とする、導電性ローラ。 In a conductive roller having a cylindrical shaft part and formed by mounting flange members having flange shafts at both ends of the shaft part,
A conductive roller, wherein the flange member is provided with blades spaced apart from the inner peripheral surface of the shaft portion. 前記羽根は、前記フランジ部材に設けられた、前記軸部の軸方向に延在する羽根軸の、外周面の羽根軸中心角が３０〜１８０度となる位置に複数個、前記軸部の軸方向両端のそれぞれの前記フランジ部材の間で周方向位置をずらして配置されている、請求項１に記載の導電性ローラ。   A plurality of the blades are provided at the flange member, and the blade shafts extending in the axial direction of the shaft portion have a plurality of blade shafts at positions where the blade shaft central angle of the outer peripheral surface is 30 to 180 degrees. The conductive roller according to claim 1, wherein the circumferential position is shifted between the flange members at both ends in the direction. 前記羽根は、前記軸部の内周面が露出する、前記フランジ部材より前記軸部の内部に入り込んだ位置に配置されている、請求項１または２に記載の導電性ローラ。   3. The conductive roller according to claim 1, wherein the blade is disposed at a position where the inner peripheral surface of the shaft portion is exposed and enters the inside of the shaft portion from the flange member. 前記軸部の外表面に、トナーを付着させるトナー付着部材が形成された現像ローラである、請求項１から３のいずれか一項に記載の導電性ローラ。   4. The conductive roller according to claim 1, wherein the conductive roller is a developing roller in which a toner adhering member for adhering toner is formed on an outer surface of the shaft portion. 5.
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JP2005181805A (en) * 2003-12-22 2005-07-07 Konica Minolta Business Technologies Inc Image forming apparatus
JP2006011275A (en) * 2004-06-29 2006-01-12 Kyocera Mita Corp Image forming apparatus
JP2007033692A (en) * 2005-07-25 2007-02-08 Fuji Xerox Co Ltd Developing device and image forming apparatus
JP2007248814A (en) * 2006-03-16 2007-09-27 Bridgestone Corp Conductive roller
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JP2013202637A (en) * 2012-03-27 2013-10-07 Jfe Steel Corp Guide roller

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61223869A (en) * 1985-03-28 1986-10-04 イ−ストマン　コダック　カンパニ− Electronic copy developer
JPH0314666U (en) * 1989-06-28 1991-02-14
JPH0639208U (en) * 1992-10-22 1994-05-24 川崎製鉄株式会社 roll
JPH06202458A (en) * 1992-12-28 1994-07-22 Minolta Camera Co Ltd Developing device
JP2002091158A (en) * 2000-07-14 2002-03-27 Ricoh Co Ltd One-component developing roller, its developing device and image forming device
JP2005181805A (en) * 2003-12-22 2005-07-07 Konica Minolta Business Technologies Inc Image forming apparatus
JP2006011275A (en) * 2004-06-29 2006-01-12 Kyocera Mita Corp Image forming apparatus
JP2007033692A (en) * 2005-07-25 2007-02-08 Fuji Xerox Co Ltd Developing device and image forming apparatus
JP2007248814A (en) * 2006-03-16 2007-09-27 Bridgestone Corp Conductive roller
JP2009192748A (en) * 2008-02-13 2009-08-27 Sharp Corp Developing roller, developing device, and image forming apparatus
JP2013202637A (en) * 2012-03-27 2013-10-07 Jfe Steel Corp Guide roller

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