JP4761212B2 - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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JP4761212B2
JP4761212B2 JP2006311540A JP2006311540A JP4761212B2 JP 4761212 B2 JP4761212 B2 JP 4761212B2 JP 2006311540 A JP2006311540 A JP 2006311540A JP 2006311540 A JP2006311540 A JP 2006311540A JP 4761212 B2 JP4761212 B2 JP 4761212B2
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shaft
image forming
forming apparatus
toner
paddle
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JP2008129161A (en
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成年 高松
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Murata Machinery Ltd
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Murata Machinery Ltd
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Description

本発明は、軸部材と、この軸部材を回転可能に支持する軸受け部材と、を有する画像形成装置に関する。   The present invention relates to an image forming apparatus having a shaft member and a bearing member that rotatably supports the shaft member.

従来の画像形成装置には、ドラムユニットが着脱可能に設けられている。このドラムユニットには、感光体ドラムと、トナーを軸方向に移送するスクリュー部材やトナーをスクリュー部材に供給するパドル部材などの軸部材が設けられている。   A conventional image forming apparatus is detachably provided with a drum unit. This drum unit is provided with a photosensitive drum, and a shaft member such as a screw member that transports toner in the axial direction and a paddle member that supplies toner to the screw member.

スクリュー部材とパドル部材とは、所定の間隔をあけて略平行となるように配置されている。また、スクリュー部材とパドル部材の各軸部は、樹脂製の軸受け部材に形成された断面円形状の貫通孔に回転可能に支持されている。
特開２００２−１３２１０９号公報 特開平０８−２１１７３７号公報 The screw member and the paddle member are arranged so as to be substantially parallel with a predetermined interval. Further, each shaft portion of the screw member and the paddle member is rotatably supported by a through hole having a circular cross section formed in the resin bearing member.
JP 2002-132109 A Japanese Patent Laid-Open No. 08-211737

ところで、従来の画像形成装置では、トナーがパドル部材の軸部と軸受け部材の貫通孔との隙間に進入し、そこで固着して詰まってしまうことがある。トナーが詰まると、パドル部材の回転が阻害されるという問題が生じる。特に、高温多湿の環境で、画像形成装置を使用する場合には、トナーが固着し易くなるので一層問題となる。この問題は、スクリュー部材においても同様である。   By the way, in the conventional image forming apparatus, the toner may enter the gap between the shaft portion of the paddle member and the through hole of the bearing member, and may be fixed and clogged there. When the toner is clogged, there arises a problem that the rotation of the paddle member is hindered. In particular, when the image forming apparatus is used in a high-temperature and high-humidity environment, the toner is more easily fixed, which causes a further problem. This problem also applies to the screw member.

特に、貫通孔にスクリュー部材やパドル部材の各軸部を支持する構成の軸受け部材ではなく、袋状（閉じられた）の凹部にスクリュー部材やパドル部材の各軸部を支持する構成の軸受け部材の場合には、凹部にはトナーが滞留し易くなるため、トナー詰まりの問題が顕著になる。   In particular, it is not a bearing member configured to support each shaft portion of the screw member or paddle member in the through-hole, but a bearing member configured to support each shaft portion of the screw member or paddle member in a bag-like (closed) recess. In this case, the toner is liable to stay in the recess, so that the problem of toner clogging becomes significant.

そこで、本発明は、上記事情を考慮し、スクリュー部材やパドル部材などの軸部材を回転可能に支持する軸受け部材においてトナーが詰まり軸部材の回転を阻害することを防止できる画像形成装置を提供することを目的とする。   In view of the above circumstances, the present invention provides an image forming apparatus capable of preventing clogging of toner in a bearing member that rotatably supports a shaft member such as a screw member or a paddle member, thereby preventing the rotation of the shaft member. For the purpose.

請求項１に記載の発明は、軸部材と、前記軸部材の軸部が挿通する挿通部を有し前記挿通部で前記軸部材を回転可能に支持する軸受け部材と、を有し、前記挿通部で支持された前記軸部材の軸方向に対して垂直方向に切断した前記挿通部の断面形状が多角形であり、前記挿通部の断面形状は、前記挿通部の軸方向にわたって同じ多角形であり、前記軸部材の前記軸部の軸方向に対して垂直方向に切断した前記軸部の断面形状が円形状であり、前記挿通部に支持された前記軸部材の軸方向に対して垂直方向に切断した前記挿通部の断面形状を四角形状にしたことを特徴とする。 The invention according to claim 1 includes a shaft member, and a bearing member that has an insertion portion through which the shaft portion of the shaft member is inserted and rotatably supports the shaft member at the insertion portion, and the insertion The cross-sectional shape of the insertion part cut in a direction perpendicular to the axial direction of the shaft member supported by the part is a polygon, and the cross-sectional shape of the insertion part is the same polygon over the axial direction of the insertion part. Ah is, a the shaft the shaft portion of the cross-sectional shape is circular cut in a direction perpendicular to the axial direction of the shaft portion of the member, perpendicular to the axial direction of the shaft member supported on the insertion portion The cross-sectional shape of the insertion portion cut in the direction is a square shape .

請求項２に記載の発明は、請求項１に記載の画像形成装置において、前記軸部材の前記軸部は、前記挿通部において３点又は４点で支持されていることを特徴とする。   According to a second aspect of the present invention, in the image forming apparatus according to the first aspect, the shaft portion of the shaft member is supported at three or four points in the insertion portion.

請求項３に記載の発明は、請求項１又は２に記載の画像形成装置において、前記軸部材は、トナーを軸方向に移送するスクリュー部材に前記トナーを供給するパドル部材であることを特徴とする。 According to a third aspect of the present invention, in the image forming apparatus according to the first or second aspect , the shaft member is a paddle member that supplies the toner to a screw member that transports the toner in the axial direction. To do.

本発明によれば、挿通部で支持された軸部材の軸方向に対して垂直方向に切断した挿通部の断面形状を角形状にしたことにより、軸部材にトナーが付着し挿通部に進入した場合でも、軸部材が挿通部で回転すると、トナーが挿通部の角に逃げる。これにより、軸部材の軸部と挿通部との間にトナーが詰まり軸部材の回転が阻害されることを防止できる。 According to the present invention, since the cross-sectional shape of the insertion portion cut in the direction perpendicular to the axial direction of the shaft member supported by the insertion portion is rectangular, the toner adheres to the shaft member and enters the insertion portion. Even in this case, when the shaft member rotates at the insertion portion, the toner escapes to the corner of the insertion portion. Thereby, it is possible to prevent the toner from being clogged between the shaft portion and the insertion portion of the shaft member and inhibiting the rotation of the shaft member.

本発明によれば、軸部材の軸部は、挿通部において３点又は４点で支持されているため、挿通部において軸部材を安定して支持することができる。この結果、軸部材の回転を安定させることができる。 According to the present invention, since the shaft portion of the shaft member is supported at three or four points in the insertion portion, the shaft member can be stably supported at the insertion portion. As a result, the rotation of the shaft member can be stabilized.

本発明によれば、挿通部に支持された軸部材の軸方向に対して垂直方向に切断した挿通部の断面形状を四角形状にしたことにより、切断面が円形状の軸部を有する軸部材を４点で支持して安定して回転させることができる。また、同時に、挿通部の角の数を可能な限り減らして軸部の外周面に直接付着するトナー量を低減させることができる。 According to the present invention, the cross-sectional shape of the insertion part cut in the direction perpendicular to the axial direction of the shaft member supported by the insertion part is made into a quadrangular shape, whereby the shaft member having a shaft part with a circular cut surface Can be stably rotated with four points supported. At the same time, the number of corners of the insertion portion can be reduced as much as possible to reduce the amount of toner directly attached to the outer peripheral surface of the shaft portion.

本発明によれば、軸部材はトナーを軸方向に移送するスクリュー部材に前記トナーを供給するパドル部材である。このように、トナーが進入し易い環境でも、挿通部の断面形状を角形状にしたことにより、トナーが詰まりパドル部材の回転が阻害されることを防止することができる。 According to the present invention, the shaft member is a paddle member that supplies the toner to a screw member that transports the toner in the axial direction. As described above, even in an environment where the toner easily enters, the cross-sectional shape of the insertion portion is formed into a square shape, thereby preventing the toner from being clogged and the rotation of the paddle member from being hindered.

次に、本発明の一実施形態に係る画像形成装置について、図面を参照して説明する。   Next, an image forming apparatus according to an embodiment of the present invention will be described with reference to the drawings.

図１に示すように、画像形成装置１０は、画像形成装置本体１２を備えている。この画像形成装置本体１２には、複数の給紙カセット１４が多段になって配置されている。各給紙カセット１４には、サイズの異なる用紙が積層された状態で収納されている。この画像形成装置本体１２の内部には、帯電器、現像器、露光器、定着器などを含んだ画像形成部（図示省略）が収納されている。なお、帯電器、現像器、定着器などを含んだ画像形成部により用紙に画像を形成する方法は、従来から周知なので説明を省略する。   As shown in FIG. 1, the image forming apparatus 10 includes an image forming apparatus main body 12. The image forming apparatus main body 12 has a plurality of paper feed cassettes 14 arranged in multiple stages. Each sheet cassette 14 stores sheets of different sizes in a stacked state. The image forming apparatus main body 12 contains an image forming section (not shown) including a charger, a developing device, an exposure device, a fixing device, and the like. A method for forming an image on a sheet by an image forming unit including a charger, a developing device, a fixing device, and the like is well known in the art and will not be described.

また、画像形成装置本体１２の上部には、原稿の画像を読み取る画像読取部１６が設けられている。また、画像読取部１６の近傍には、各操作を実行するための操作部１８が設けられている。   An image reading unit 16 that reads an image of a document is provided on the upper part of the image forming apparatus main body 12. An operation unit 18 for executing each operation is provided in the vicinity of the image reading unit 16.

この画像形成装置１０では、ユーザが操作部１８を操作すると、原稿に記載されている画情報が画像読取部１６により読み取られ、この読取データに基づいて画像形成部により給紙カセット１４に収納されていた用紙に画像が形成される。   In this image forming apparatus 10, when a user operates the operation unit 18, image information described in a document is read by the image reading unit 16, and is stored in the paper feed cassette 14 by the image forming unit based on the read data. An image is formed on the paper that was left.

また、画像形成装置本体１２の側面には開口部（図示省略）が形成されており、ジャムアクセスカバー２０が画像形成装置本体１２に対して開閉可能となるように取り付けられている。ジャムアクセスカバー２０が画像形成装置本体１２に対して開いた状態になると、画像形成装置本体１２の側面の開口部が解放され、ジャムアクセスカバー２０が画像形成装置本体１２に対して閉じた状態になると、画像形成装置本体１２の側面の開口部が閉塞された状態となる。そして、画像形成装置本体１２の内部において用紙が詰まった場合には、このジャムアクセスカバー２０を画像形成装置本体１２に対して開くことにより、詰まった用紙を開口部から容易に取り除くことが可能となる。   An opening (not shown) is formed on the side surface of the image forming apparatus main body 12, and the jam access cover 20 is attached so as to be openable and closable with respect to the image forming apparatus main body 12. When the jam access cover 20 is opened with respect to the image forming apparatus main body 12, the opening on the side surface of the image forming apparatus main body 12 is released and the jam access cover 20 is closed with respect to the image forming apparatus main body 12. As a result, the opening on the side surface of the image forming apparatus main body 12 is closed. When the paper is jammed inside the image forming apparatus main body 12, the jam access cover 20 can be opened with respect to the image forming apparatus main body 12 so that the jammed paper can be easily removed from the opening. Become.

また、図２及び図３に示すように、画像形成装置本体１２の内部には、現像器として機能するドラムユニット２２が着脱自在に収納されている。ドラムユニット２２には、感光体ドラム２４が回転可能に取り付けられている。また、ドラムユニット２２には、使用後の廃トナーを所定の方向に搬送させるための廃トナー搬送部２６が設けられている。この廃トナー搬送部２６には、所定の間隔をあけて設けられた樹脂製の一対の軸受け部材２８が取り付けられている。この軸受け部材２８には、廃トナーを軸方向に搬送させるスクリュー部材３０を貫通させるための貫通孔３２が形成されている。そして、軸受け部材２８の外側には筒状に形成された軸支持部３４が取り付けられており、この軸支持部３４に軸受け部材２８を貫通したスクリュー部材３０の軸部（図示省略）が回転可能となるように支持されている。スクリュー部材３０の外周面には軸方向にわたって螺旋状の突出片３３が形成されており、スクリュー部材３０が図示しないモータなどの回転駆動機構により回転されることにより、廃トナーがスクリュー部材３０の軸方向一方側に向かって搬送されていく。   As shown in FIGS. 2 and 3, a drum unit 22 that functions as a developing device is detachably housed inside the image forming apparatus main body 12. A photosensitive drum 24 is rotatably attached to the drum unit 22. Further, the drum unit 22 is provided with a waste toner transport unit 26 for transporting the used waste toner in a predetermined direction. A pair of resin bearing members 28 provided at a predetermined interval are attached to the waste toner conveying portion 26. The bearing member 28 is formed with a through hole 32 for passing through a screw member 30 for conveying the waste toner in the axial direction. A cylindrical shaft support portion 34 is attached to the outside of the bearing member 28, and a shaft portion (not shown) of the screw member 30 penetrating the bearing member 28 through the shaft support portion 34 is rotatable. It is supported to become. A spiral projecting piece 33 is formed on the outer peripheral surface of the screw member 30 in the axial direction. The screw member 30 is rotated by a rotation drive mechanism such as a motor (not shown), so that waste toner is removed from the shaft of the screw member 30. It is transported toward one direction.

また、図３及び図４に示すように、軸受け部材２８には、スクリュー部材３０と平行するようにパドル部材（軸部材）３６が回転可能となるように設けられている。このパドル部材３６が回転することにより、廃トナーをスクリュー部材３０側に供給できるようになっている。なお、パドル部材３６とスクリュー部材３０とは一方が回転すれば他方も回転するような歯車群で機械的に接続されており、回転駆動機構によりスクリュー部材３０が回転されると、パドル部材３６も回転するようになっている。軸受け部材２８には、軸受けとして機能する凹部状部材（挿通部）３８が取り付けられており、凹部状部材３８にはパドル部材３６の軸部４２が回転可能に支持されている。このように、パドル部材３６の軸受けは、所謂袋状になっている。この凹部状部材３８は、パドル部材３６の軸部４２を回転可能に支持する筒状部４０を備えている。   As shown in FIGS. 3 and 4, the bearing member 28 is provided with a paddle member (shaft member) 36 so as to be rotatable so as to be parallel to the screw member 30. By rotating the paddle member 36, waste toner can be supplied to the screw member 30 side. Note that the paddle member 36 and the screw member 30 are mechanically connected by a gear group that rotates when one rotates, and when the screw member 30 is rotated by the rotation drive mechanism, the paddle member 36 also rotates. It is designed to rotate. A concave member (insertion portion) 38 that functions as a bearing is attached to the bearing member 28, and a shaft portion 42 of the paddle member 36 is rotatably supported by the concave member 38. Thus, the bearing of the paddle member 36 has a so-called bag shape. The recessed member 38 includes a cylindrical portion 40 that rotatably supports the shaft portion 42 of the paddle member 36.

ここで、図４に示すように、凹部状部材３８によりパドル部材３６の軸部４２が支持された状態で、凹部状部材３８で支持されたパドル部材３６の軸部４２の軸方向に対して垂直方向に切断した凹部状部材３８の筒状部４０の断面形状は、角形状となるように設定されている。具体的には、凹部状部材３８の筒状部４０の断面形状は、略正方形状に設定されている。そして、パドル部材３６の軸部４２の断面形状が円形状なので、パドル部材３６の軸部４２は、筒状部４０の内面において４点で支持されている。   Here, as shown in FIG. 4, with respect to the axial direction of the shaft portion 42 of the paddle member 36 supported by the recessed member 38 in a state where the shaft portion 42 of the paddle member 36 is supported by the recessed member 38. The cross-sectional shape of the cylindrical portion 40 of the concave member 38 cut in the vertical direction is set to be a square shape. Specifically, the cross-sectional shape of the tubular portion 40 of the recessed member 38 is set to be a substantially square shape. Since the cross-sectional shape of the shaft portion 42 of the paddle member 36 is circular, the shaft portion 42 of the paddle member 36 is supported at four points on the inner surface of the cylindrical portion 40.

このため、図４に示すように、パドル部材３６の軸部４２が凹部状部材３８に支持された状態では、筒状部４０の４つの角において軸部４２との間に隙間（空間部）４４が形成された状態になる。   For this reason, as shown in FIG. 4, in a state where the shaft portion 42 of the paddle member 36 is supported by the recessed member 38, gaps (space portions) are formed between the shaft portion 42 at the four corners of the tubular portion 40. 44 is formed.

なお、凹部状部材３８の筒状部４０の断面形状は、角形状であれば、正方形状に限られるものではなく、三角形、長方形などの四角形、五角形、六角形以上の多角形でもよい。また、パドル部材３６の軸部４２と筒状部４０の内面との接点は、４点に限られず、３点以上であれば、パドル部材３６の軸部が安定して支持され、パドル部材３６の回転も安定するため、好ましい。   The cross-sectional shape of the cylindrical portion 40 of the concave member 38 is not limited to a square shape as long as it is a square shape, and may be a quadrilateral such as a triangle or a rectangle, a pentagon, or a polygon that is a hexagon or more. Further, the contact between the shaft portion 42 of the paddle member 36 and the inner surface of the tubular portion 40 is not limited to four points, and if it is three or more points, the shaft portion of the paddle member 36 is stably supported, and the paddle member 36 Is also preferable because it also stabilizes the rotation.

また、パドル部材３６の軸部４２を回転支持する凹部状部材３８の筒状部４０の断面形状が角形状に設定されることに限られるものではなく、例えば、スクリュー部材３０の軸部を支持する軸受けなど、トナーが付着する全ての軸部材を回転支持する全ての軸受けの断面形状を角形状に設定することが好ましい。   Further, the cross-sectional shape of the tubular portion 40 of the concave member 38 that rotatably supports the shaft portion 42 of the paddle member 36 is not limited to being set to a square shape, and for example, the shaft portion of the screw member 30 is supported. It is preferable to set the cross-sectional shape of all the bearings that rotate and support all the shaft members to which the toner adheres, such as bearings to be square, to a square shape.

次に、本実施形態の画像形成装置１０の作用について説明する。   Next, the operation of the image forming apparatus 10 of this embodiment will be described.

図３及び図４に示すように、廃トナー搬送部２４の内部は、感光体ドラム２４の外周面に供給されたトナーの一部が廃トナーとして収集されている。ここで、スクリュー部材３０が回転することにより、スクリュー部材３０の近傍に位置する廃トナーは、スクリュー部材３０の外周面に形成された螺旋状の突出片３３に押される形で軸方向一方側に移送されていく。そして、パドル部材３６がスクリュー部材３０の回転と連動して回転することにより、パドル部材３６近傍の廃トナーがスクリュー部材３０側に供給される。このようにして、廃トナー搬送部２６の内部の廃トナーは、全てスクリュー部材３０により軸方向一方側に移送され、その後、図示しない廃トナーケースに送られる。   As shown in FIGS. 3 and 4, a part of the toner supplied to the outer peripheral surface of the photosensitive drum 24 is collected as waste toner in the waste toner conveyance unit 24. Here, as the screw member 30 rotates, the waste toner positioned in the vicinity of the screw member 30 is pushed to one side in the axial direction by being pushed by the spiral protruding piece 33 formed on the outer peripheral surface of the screw member 30. It will be transferred. Then, when the paddle member 36 rotates in conjunction with the rotation of the screw member 30, waste toner near the paddle member 36 is supplied to the screw member 30 side. In this way, all of the waste toner inside the waste toner transport unit 26 is transferred to one side in the axial direction by the screw member 30 and then sent to a waste toner case (not shown).

ここで、廃トナー搬送部２６の内部には廃トナーが充填されているため、パドル部材３６には廃トナーが付着する。そして、その廃トナーは、凹部状部材３８の筒状部４０の内部に進入する。   Here, since the waste toner is filled in the waste toner conveying portion 26, the waste toner adheres to the paddle member 36. Then, the waste toner enters the inside of the cylindrical portion 40 of the concave member 38.

廃トナーが凹部状部材３８の筒状部４０の内部に進入していくと、パドル部材３６の軸部４２の回転とともに、廃トナーが軸部４２の外周方向に押し出される。そして、凹部状部材３８の筒状部４０の４つの角と軸部４２との間に形成された隙間（空間部）４４に廃トナーが溜まっていく。この結果、パドル部材３６の軸部４２とパドル部材３６の筒状部４０との接触部に廃トナーが詰まることがないため、パドル部材３６の回転が阻害されることを防止できる。   When the waste toner enters the inside of the cylindrical portion 40 of the concave member 38, the waste toner is pushed out in the outer peripheral direction of the shaft portion 42 as the shaft portion 42 of the paddle member 36 rotates. The waste toner accumulates in gaps (space portions) 44 formed between the four corners of the cylindrical portion 40 of the concave member 38 and the shaft portion 42. As a result, the waste toner is not clogged in the contact portion between the shaft portion 42 of the paddle member 36 and the cylindrical portion 40 of the paddle member 36, so that the rotation of the paddle member 36 can be prevented from being hindered.

特に、筒状部４０に支持されたパドル部材３６の軸部４２の軸方向に対して垂直方向に切断した筒状部４０の断面形状を正方形状にしたことにより、パドル部材３６の軸部４２を４点で支持して安定して回転させることができる。また、同時に、筒状部４０の角の数を４つに減らしてパドル部材３６の軸部４２の外周面に直接付着するトナー量を低減させることができる。この結果、パドル部材３６の軸部４２とパドル部材３６の筒状部４０との接触部に廃トナーが詰まってしまうことを大幅に抑制することができる。   In particular, the cross-sectional shape of the tubular portion 40 cut in the direction perpendicular to the axial direction of the shaft portion 42 of the paddle member 36 supported by the tubular portion 40 is made square, so that the shaft portion 42 of the paddle member 36 is obtained. Can be stably rotated with four points supported. At the same time, the number of corners of the cylindrical portion 40 can be reduced to four, so that the amount of toner directly attached to the outer peripheral surface of the shaft portion 42 of the paddle member 36 can be reduced. As a result, it is possible to greatly suppress clogging of waste toner at the contact portion between the shaft portion 42 of the paddle member 36 and the cylindrical portion 40 of the paddle member 36.

また、廃トナー搬送部２６の内部に配置されたパドル部材３６の軸受けとなる凹部状部材３８の筒状部４０の断面形状を正方形状とすることにより、廃トナーが進入し易い環境でも、廃トナーが詰まってパドル部材３６の回転が阻害されることを防止することができる。   Further, by making the cross-sectional shape of the cylindrical portion 40 of the concave member 38 serving as a bearing for the paddle member 36 disposed inside the waste toner conveying portion 26 into a square shape, the waste toner can be disposed even in an environment where waste toner easily enters. It is possible to prevent the toner from clogging and hindering the rotation of the paddle member 36.

なお、廃トナー搬送部２６の内部に配置されたスクリュー部材３０の軸受けの断面形状を角形状とすることにより、廃トナーが詰まってスクリュー部材３０の回転が阻害されることを防止することができる。   In addition, by making the cross-sectional shape of the bearing of the screw member 30 disposed inside the waste toner conveying portion 26 into a square shape, it is possible to prevent the waste toner from being clogged and obstructing the rotation of the screw member 30. .

本発明の一実施形態に係る画像形成装置の正面図である。1 is a front view of an image forming apparatus according to an embodiment of the present invention. 本発明の一実施形態に係る画像形成装置に用いられるドラムユニットの斜視図である。1 is a perspective view of a drum unit used in an image forming apparatus according to an embodiment of the present invention. 図２のドラムユニットの内部に形成された廃トナー搬送部の斜視図である。FIG. 3 is a perspective view of a waste toner transport unit formed inside the drum unit of FIG. 2. 図２のドラムユニットの内部に形成された廃トナー搬送部に設けられる軸受け部材に軸部材が軸支された状態を示す断面図である。FIG. 3 is a cross-sectional view illustrating a state in which a shaft member is pivotally supported on a bearing member provided in a waste toner conveyance unit formed inside the drum unit of FIG. 2.

符号の説明Explanation of symbols

１０ 画像形成装置
２８ 軸受け部材
３０ スクリュー部材
３６ パドル部材（軸部材）
３８ 凹部状部材（挿通部） 10 Image forming apparatus
28 Bearing member 30 Screw member 36 Paddle member (shaft member)
38 Recessed member (insertion part)

Claims (3)

軸部材と、
前記軸部材の軸部が挿通する挿通部を有し前記挿通部で前記軸部材を回転可能に支持する軸受け部材と、
を有し、
前記挿通部で支持された前記軸部材の軸方向に対して垂直方向に切断した前記挿通部の断面形状が多角形であり、
前記挿通部の断面形状は、前記挿通部の軸方向にわたって同じ多角形であり、
前記軸部材の前記軸部の軸方向に対して垂直方向に切断した前記軸部の断面形状が円形状であり、
前記挿通部に支持された前記軸部材の軸方向に対して垂直方向に切断した前記挿通部の断面形状を四角形状にしたことを特徴とする画像形成装置。 A shaft member;
A bearing member that has an insertion portion through which the shaft portion of the shaft member is inserted, and rotatably supports the shaft member at the insertion portion;
Have
The cross-sectional shape of the insertion part cut in a direction perpendicular to the axial direction of the shaft member supported by the insertion part is a polygon,
Cross-sectional shape of the insertion portion, Ri same polygonal der across the axial direction of the insertion portion,
The cross-sectional shape of the shaft portion cut in a direction perpendicular to the axial direction of the shaft portion of the shaft member is circular,
An image forming apparatus , wherein a cross-sectional shape of the insertion portion cut in a direction perpendicular to an axial direction of the shaft member supported by the insertion portion is a square shape . 前記軸部材の前記軸部は、前記挿通部において３点又は４点で支持されていることを特徴とする請求項１に記載の画像形成装置。   The image forming apparatus according to claim 1, wherein the shaft portion of the shaft member is supported at three or four points in the insertion portion. 前記軸部材は、トナーを軸方向に移送するスクリュー部材に前記トナーを供給するパドル部材であることを特徴とする請求項１又は２に記載の画像形成装置。 The image forming apparatus according to claim 1 , wherein the shaft member is a paddle member that supplies the toner to a screw member that transports the toner in an axial direction .
JP2006311540A 2006-11-17 2006-11-17 Image forming apparatus Expired - Fee Related JP4761212B2 (en)

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JP4761212B2 true JP4761212B2 (en) 2011-08-31

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3768710B2 (en) * 1999-01-28 2006-04-19 キヤノン株式会社 Developing device, process cartridge, and electrophotographic image forming apparatus
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