JP5542235B2 - Developer container and image forming apparatus having the same - Google Patents

Developer container and image forming apparatus having the same Download PDF

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JP5542235B2
JP5542235B2 JP2013141280A JP2013141280A JP5542235B2 JP 5542235 B2 JP5542235 B2 JP 5542235B2 JP 2013141280 A JP2013141280 A JP 2013141280A JP 2013141280 A JP2013141280 A JP 2013141280A JP 5542235 B2 JP5542235 B2 JP 5542235B2
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toner
seal member
flange portion
developer
rotating shaft
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JP2013235283A (en
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耕治 村田
尚樹 水谷
達彦 吉井
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Kyocera Document Solutions Inc
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Description

本発明は、電子写真方式の複写機やレーザプリンタ等の画像形成装置に用いられる、現像剤攪拌部材や現像剤搬送部材、現像剤担持体等の回転体を備えた現像剤収容容器及びそれを備えた画像形成装置に関するものである。   The present invention relates to a developer container including a developer agitating member, a developer conveying member, a rotating member such as a developer carrier used in an image forming apparatus such as an electrophotographic copying machine and a laser printer, and the like. The present invention relates to an image forming apparatus provided.

従来、電子写真方式の複写機やレーザプリンタ等の画像形成装置においては、画像形成装置の現像部にトナー供給口からトナーを供給するトナーカートリッジや中間ホッパー等のトナー収容容器が備えられており、このトナー収容容器内には、容器内のトナーをトナー供給口まで搬送するためにトナー攪拌部材が設けられている。   Conventionally, in an image forming apparatus such as an electrophotographic copying machine or a laser printer, a toner storage container such as a toner cartridge or an intermediate hopper for supplying toner from a toner supply port to a developing unit of the image forming apparatus is provided. A toner agitating member is provided in the toner storage container to convey the toner in the container to the toner supply port.

トナー攪拌部材としては、トナー収容容器内に回転自在に支持される回転軸と、回転軸の外周面に形成される螺旋羽とで構成される攪拌搬送スクリューや、回転軸の外周面に合成樹脂製シート等の可撓性部材を取り付けた攪拌パドルがあり、回転軸を中心としてトナー攪拌部材を回転させることでトナー収容容器内のトナーが攪拌され、トナー供給口までトナーが搬送されるようになっている。   Examples of the toner agitating member include an agitating and conveying screw composed of a rotating shaft rotatably supported in the toner container and a spiral blade formed on the outer peripheral surface of the rotating shaft, and a synthetic resin on the outer peripheral surface of the rotating shaft. There is an agitation paddle to which a flexible member such as a sheet-made sheet is attached, and the toner in the toner container is agitated by rotating the toner agitation member about the rotation axis so that the toner is conveyed to the toner supply port. It has become.

上記のような構成の場合、トナー収容容器と回転軸との隙間からトナーが漏出しないように、トナー収容容器と回転軸との間に弾性部材から成るシール部材を配置する対策が取られている。   In the case of the above configuration, a measure is taken to arrange a seal member made of an elastic member between the toner container and the rotation shaft so that the toner does not leak from the gap between the toner container and the rotation shaft. .

図8は、従来のトナー収容容器における回転軸の支持部周辺を示す断面図である。図8に示すように、回転軸101の端部はトナー収容容器102の軸受け孔103に挿入されて回転自在に支持されている。回転軸101の外周面には、トナー収容容器102の内側面102aと対向するフランジ部104が形成されており、フランジ部104と内側面102aとの間には弾性材料から成るリング状のシール部材105が配置されている。   FIG. 8 is a cross-sectional view showing the periphery of the support portion of the rotating shaft in the conventional toner container. As shown in FIG. 8, the end of the rotating shaft 101 is inserted into a bearing hole 103 of the toner container 102 and is rotatably supported. A flange portion 104 facing the inner side surface 102a of the toner container 102 is formed on the outer peripheral surface of the rotating shaft 101, and a ring-shaped sealing member made of an elastic material is formed between the flange portion 104 and the inner side surface 102a. 105 is arranged.

ここで、シール部材105によるシール性能を高めてトナーの漏出を確実に防止するためには、シール部材105とフランジ部104及び内側面102aとの接触面積を広くするとともに、シール部材105を所定以上の圧縮率で圧縮してフランジ部104及び内側面102aとの密着性を高める必要がある。   Here, in order to enhance the sealing performance of the sealing member 105 and reliably prevent toner leakage, the contact area between the sealing member 105 and the flange portion 104 and the inner side surface 102a is increased, and the sealing member 105 is set to a predetermined size or more. It is necessary to increase the adhesion between the flange portion 104 and the inner side surface 102a by compressing at a compression rate of.

しかし、シール部材105の面積及び圧縮率が大きくなると、トナー攪拌部材の駆動トルクが大きくなってモータの負荷が増加してしまう。また、シール部材105と内側面102aとの摩擦により発熱し、トナーの融着も発生し易くなる。   However, when the area and the compression ratio of the seal member 105 are increased, the driving torque of the toner agitating member is increased and the load on the motor is increased. Further, heat is generated due to friction between the seal member 105 and the inner side surface 102a, and toner fusing easily occurs.

そこで、例えば特許文献1には、弾性材料から成るリング状のパッキン(シール部材)とポリエステルフィルム等の低摩擦シール体とを現像ローラの回転軸に装着することにより、現像ローラの回転トルクを高くすることなくトナー漏れを防止する方法が開示されている。   Therefore, for example, in Patent Document 1, a rotational torque of the developing roller is increased by mounting a ring-shaped packing (seal member) made of an elastic material and a low friction seal body such as a polyester film on the rotating shaft of the developing roller. A method for preventing toner leakage without disabling is disclosed.

特開平2−248974号公報JP-A-2-248974

特許文献1の方法によれば、低摩擦シール体により駆動トルクは低減できるものの、弾性材料から成るシール部材のみを用いた場合に比べて密着性が弱くなるため、シール性能が低下する。また、低摩擦シール体に折れ目等が入って表面が破損すると、シール性能が損なわれてしまい復元できなくなる。一方、弾性材料とグリス等のシール剤とを併用することにより、トルクを低下させつつシール性能を維持する方法も一般的であるが、シール剤がはみ出してトナーに混入し、画像不具合を引き起こすおそれがあった。   According to the method of Patent Document 1, although the driving torque can be reduced by the low friction seal body, the adhesiveness becomes weaker than when only the seal member made of an elastic material is used, so that the sealing performance is lowered. Moreover, if a crease or the like enters the low friction seal body and the surface is damaged, the seal performance is impaired and cannot be restored. On the other hand, a method of maintaining sealing performance while reducing torque by using an elastic material and a sealing agent such as grease is also common, but the sealing agent may stick out and mix with toner, causing image defects was there.

なお、ここではトナー攪拌部材を備えたトナー収容容器の回転軸周りのシール構造を例に挙げて説明したが、現像剤攪拌搬送部材、現像ローラ等の回転体を備えた現像装置のシール構造においても同様の問題点が存在する。   Here, the seal structure around the rotation axis of the toner container provided with the toner agitating member has been described as an example. However, in the seal structure of the developing device provided with a rotating body such as a developer agitating and conveying member and a developing roller. There are similar problems.

本発明は、上記問題点に鑑み、簡単な構成で回転軸端部のシール性能を確保しつつ、回転体の駆動トルクも低減できる現像剤収容容器及びそれを備えた画像形成装置を提供することを目的とする。   SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a developer container and an image forming apparatus including the developer container that can reduce the driving torque of the rotating body while ensuring the sealing performance of the rotating shaft end with a simple configuration. With the goal.

上記目的を達成するために本発明の第1の構成は、現像剤収容部と、回転体と、を備えた現像剤収容容器である。現像剤収容部は、現像剤を収容する。回転体は、現像剤収容部の側面に回転可能に支持される回転軸を有する。回転軸の外周面には、現像剤収容部の内側面に対向するフランジ部が形成され、フランジ部と現像剤収容部の内側面との間には弾性材料で形成されたリング状のシール部材が回転軸方向に圧縮されて配置されている。フランジ部の径方向外側におけるシール部材の圧縮率は、フランジ部の径方向内側に比べて高くなっている。   In order to achieve the above object, a first configuration of the present invention is a developer container including a developer container and a rotating body. The developer storage unit stores the developer. The rotating body has a rotating shaft that is rotatably supported on a side surface of the developer accommodating portion. A flange portion facing the inner side surface of the developer accommodating portion is formed on the outer peripheral surface of the rotating shaft, and a ring-shaped seal member formed of an elastic material between the flange portion and the inner side surface of the developer accommodating portion. Are arranged compressed in the direction of the rotation axis. The compression rate of the seal member on the radially outer side of the flange portion is higher than that on the radially inner side of the flange portion.

本発明の第1の構成によれば、フランジ部の径方向外側におけるシール部材の圧縮率を径方向内側に比べて高くすることにより、シール部材の径方向外側においてはフランジ部及び内側面との密着性が強くなり、現像剤収容部内の現像剤の容器外部への漏出を確実に防止することができる。また、シール部材の径方向内側においてはフランジ部に対する圧接力が弱くなるため、回転軸の駆動トルクを低減することができる。また、シール部材とフランジ部及び内側面との摩擦力も低減されるため、シール部材、回転軸、或いは現像剤収容部の内側面の発熱、及びそれに伴う現像剤の融着も抑制できる。   According to the first configuration of the present invention, by increasing the compressibility of the seal member on the radially outer side of the flange portion as compared with that on the radially inner side, the flange portion and the inner side surface are formed on the radially outer side of the seal member. Adhesion is enhanced, and leakage of the developer in the developer container to the outside of the container can be reliably prevented. In addition, since the pressure contact force with respect to the flange portion is weak on the radially inner side of the seal member, the driving torque of the rotating shaft can be reduced. Further, since the frictional force between the seal member, the flange portion, and the inner side surface is also reduced, heat generation on the inner surface of the seal member, the rotating shaft, or the developer accommodating portion, and the accompanying fusion of the developer can be suppressed.

本発明のトナー収容容器が搭載された画像形成装置の概略断面図Schematic sectional view of an image forming apparatus equipped with a toner container of the present invention 本発明のトナーコンテナを下方から見た斜視図The perspective view which looked at the toner container of this invention from the downward direction トナーコンテナ内部の概略を示す側面断面図Side sectional view showing the outline of the inside of the toner container 本発明の第1実施形態に係るトナーコンテナにおける、攪拌パドルの回転軸端部周辺の断面斜視図FIG. 3 is a perspective view of a cross section of the periphery of the rotating shaft end portion of the stirring paddle in the toner container according to the first embodiment of the present invention. 第1実施形態のトナーコンテナに用いられるシール部材の断面図(図5(a))及び攪拌パドルの回転軸端部周辺の断面図(図5(b))Sectional view of the seal member used in the toner container of the first embodiment (FIG. 5A) and sectional view around the rotating shaft end of the stirring paddle (FIG. 5B) 本発明の第2実施形態に係るトナーコンテナにおける、攪拌パドルの回転軸端部周辺の断面図Sectional drawing around the rotating shaft end portion of the stirring paddle in the toner container according to the second embodiment of the present invention. 本発明の第3実施形態のトナーコンテナに用いられるシール部材の断面図(図7(a))及び攪拌パドルの回転軸端部周辺の断面図(図7(b))Sectional view (FIG. 7A) of the seal member used in the toner container of the third embodiment of the present invention and sectional view around the rotating shaft end of the stirring paddle (FIG. 7B). 従来のトナーコンテナにおける、攪拌パドルの回転軸端部周辺の断面図Sectional view around the rotating shaft end of the stirring paddle in a conventional toner container

以下、図面を参照しながら本発明の実施形態について説明する。図1は、本発明のトナー収容容器を備えた画像形成装置の概略断面図である。図1において、100は画像形成装置であり、ここでは一例としてデジタル複合機を示している。画像形成装置100では、コピー動作を行う場合、複合機本体2内の画像形成部3において、帯電ユニット4により図中のA方向に回転する小径の感光体ドラム5が一様に帯電される。次に、画像読取部6で読み取られた原稿画像データに基づく露光ユニット(レーザ走査ユニット等)7からのレーザビームにより感光体ドラム5上に静電潜像が形成され、現像ユニット8により静電潜像に現像剤(以下、トナーという)が付着されてトナー像が形成される。この現像ユニット8へのトナーの供給はトナーコンテナ9から行われる。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view of an image forming apparatus provided with a toner container of the present invention. In FIG. 1, reference numeral 100 denotes an image forming apparatus, and here, a digital multifunction peripheral is shown as an example. In the image forming apparatus 100, when performing a copying operation, in the image forming unit 3 in the multifunction machine main body 2, the small-diameter photosensitive drum 5 rotating in the direction A in the figure is uniformly charged by the charging unit 4. Next, an electrostatic latent image is formed on the photosensitive drum 5 by a laser beam from an exposure unit (laser scanning unit or the like) 7 based on the document image data read by the image reading unit 6, and electrostatically developed by the developing unit 8. A developer (hereinafter referred to as toner) is attached to the latent image to form a toner image. The toner is supplied to the developing unit 8 from the toner container 9.

上記のようにトナー像が形成された感光体ドラム5に向けて、用紙が給紙機構10から用紙搬送路11及びレジストローラ対12を経由して画像形成部3に搬送され、この画像形成部3において転写ローラ13(画像転写部)により感光体ドラム5の表面におけるトナー像が用紙に転写される。そして、トナー像が転写された用紙は感光体ドラム5から分離され、定着ローラ対14aを有する定着部14に搬送されてトナー像が定着される。定着部14を通過した用紙は、複数方向に分岐した用紙搬送路15に送られて、用紙搬送路15の分岐点に設けられた複数の経路切換ガイドを有する経路切換機構21、22によって搬送方向が振り分けられ、そのまま(或いは、用紙搬送路16に送られて両面コピーされた後に)、第1排出トレイ17a、第2排出トレイ17bから成る用紙排出部に排出される。   The sheet is conveyed from the sheet feeding mechanism 10 to the image forming unit 3 via the sheet conveying path 11 and the registration roller pair 12 toward the photosensitive drum 5 on which the toner image is formed as described above. 3, the toner image on the surface of the photosensitive drum 5 is transferred to the sheet by the transfer roller 13 (image transfer unit). The sheet onto which the toner image has been transferred is separated from the photosensitive drum 5 and conveyed to a fixing unit 14 having a fixing roller pair 14a to fix the toner image. The sheet that has passed through the fixing unit 14 is sent to a sheet conveyance path 15 branched in a plurality of directions, and is conveyed in a conveyance direction by path switching mechanisms 21 and 22 having a plurality of path switching guides provided at branch points of the sheet conveyance path 15. Are distributed as they are (or after being sent to the paper conveyance path 16 and double-sided copying), and discharged to the paper discharge section including the first discharge tray 17a and the second discharge tray 17b.

また、図示しないが、感光体ドラム5の表面の残留電荷を除去する除電装置が感光体ドラム5の回転方向に対しクリーニング装置18の下流側に設けられている。さらに、給紙機構10は、複合機本体2に着脱自在に取り付けられ、用紙を収納する複数の給紙カセット10a、10bと、その上方に設けられる手差し給紙機構(バイパスユニット)10cとを備えてなり、これらは用紙搬送路11によって感光体ドラム5及び現像ユニット8等からなる画像形成部3に繋がっている。画像読取部6の上端にはコンタクトガラス上に載置される原稿を押さえて保持する開閉可能なプラテン(原稿押さえ)24が設けられている。   Further, although not shown, a static elimination device that removes residual charges on the surface of the photosensitive drum 5 is provided on the downstream side of the cleaning device 18 with respect to the rotation direction of the photosensitive drum 5. Further, the paper feeding mechanism 10 is detachably attached to the multifunction machine main body 2 and includes a plurality of paper feeding cassettes 10a and 10b for storing paper, and a manual paper feeding mechanism (bypass unit) 10c provided above the paper feeding cassettes 10a and 10b. These are connected to the image forming unit 3 including the photosensitive drum 5, the developing unit 8 and the like by the paper transport path 11. At the upper end of the image reading unit 6, an openable / closable platen (original presser) 24 that presses and holds the original placed on the contact glass is provided.

用紙搬送路15は、具体的には、定着ローラ対14aの下流側において、まず左右二股に分岐し、一方の経路(図1では右方向に分岐する経路)は第1排出トレイ17aに連通するように構成されている。そして、他方の経路(図1では左方向に分岐する経路)は搬送ローラ対19を経由して上下に分岐し、一方の経路(図1では左方向に分岐する経路)は第2排出トレイ17bに連通するように構成されている。これに対し、他方の経路(図1では下方向に分岐する経路)は用紙搬送路16に連通するように構成されている。   Specifically, the sheet conveyance path 15 first branches into a left and right fork on the downstream side of the fixing roller pair 14a, and one path (a path branching rightward in FIG. 1) communicates with the first discharge tray 17a. It is configured as follows. The other path (the path branching leftward in FIG. 1) branches up and down via the conveying roller pair 19, and the other path (the path branching leftward in FIG. 1) is the second discharge tray 17b. It is comprised so that it may communicate with. On the other hand, the other path (the path that branches downward in FIG. 1) is configured to communicate with the sheet conveyance path 16.

次に、本発明のトナーコンテナ9について図2及び図3を参照して説明する。図2はトナーコンテナを下方から見た斜視図、図3はトナーコンテナ内部の概略構成を示す側面断面図である。なお、図3は図2の紙面奥側から見た状態を示している。ケーシング(筐体)30はトナーを貯留する容器であり、内部は仕切壁31によってトナー供給部33とトナー攪拌部35とに分離されている。トナー供給部33には、現像ユニット8(図1参照)にトナーを供給するためのトナー供給口37が中央部近傍に設けられており、トナー供給部33内のトナーをトナー供給口37まで搬送するために、螺旋形状の羽根を有するスパイラル部材40が回転自在に設けられている。   Next, the toner container 9 of the present invention will be described with reference to FIGS. FIG. 2 is a perspective view of the toner container as viewed from below, and FIG. 3 is a side sectional view showing a schematic configuration of the toner container. FIG. 3 shows a state viewed from the back side in FIG. The casing (housing) 30 is a container for storing toner, and the inside is separated into a toner supply unit 33 and a toner stirring unit 35 by a partition wall 31. The toner supply unit 33 is provided with a toner supply port 37 for supplying toner to the developing unit 8 (see FIG. 1) in the vicinity of the center, and the toner in the toner supply unit 33 is conveyed to the toner supply port 37. In order to achieve this, a spiral member 40 having spiral blades is rotatably provided.

トナー攪拌部35には、トナー攪拌部35内のトナーを撹拌するとともにトナー供給部33にトナーを搬送する攪拌パドル41が設けられている。攪拌パドル41は、回転軸42と、回転軸42に固定された攪拌羽根43とから構成されている。回転軸42の一端はトナー攪拌部35の外側面に突出し、駆動源からの駆動力を回転軸42に伝達する駆動カップリング44及びギヤ45が設けられている。ギヤ45はアイドルギヤ47を介してスパイラル部材40の駆動入力ギヤ49と連結されている。   The toner stirring unit 35 is provided with a stirring paddle 41 that stirs the toner in the toner stirring unit 35 and conveys the toner to the toner supply unit 33. The stirring paddle 41 includes a rotating shaft 42 and a stirring blade 43 fixed to the rotating shaft 42. One end of the rotating shaft 42 projects from the outer surface of the toner agitating unit 35, and a drive coupling 44 and a gear 45 are provided to transmit the driving force from the driving source to the rotating shaft 42. The gear 45 is connected to the drive input gear 49 of the spiral member 40 through the idle gear 47.

トナーコンテナ9内のトナー搬送動作について説明すると、印刷開始時には、攪拌パドル41が図3において矢印B方向に回転する。これにより、トナー攪拌部35内のトナーが攪拌され、特に、トナー攪拌部35の底部に溜まっているトナーが攪拌羽根43による内壁の摺擦によって掻き出されて隣接するトナー供給部33に搬送されていく。トナー供給部33においては、スパイラル部材40の回転によってトナーがトナー供給口37まで搬送される。そしてトナー供給口37から現像ユニット8にトナーが供給される。   The toner conveying operation in the toner container 9 will be described. At the start of printing, the stirring paddle 41 rotates in the direction of arrow B in FIG. As a result, the toner in the toner agitating unit 35 is agitated, and in particular, the toner accumulated at the bottom of the toner agitating unit 35 is scraped by the rubbing of the inner wall by the agitating blade 43 and conveyed to the adjacent toner supply unit 33. To go. In the toner supply unit 33, the toner is conveyed to the toner supply port 37 by the rotation of the spiral member 40. Then, toner is supplied from the toner supply port 37 to the developing unit 8.

図4は、本発明の第1実施形態に係るトナーコンテナにおける、攪拌パドルの回転軸端部周辺の断面斜視図であり、図5は、第1実施形態のトナーコンテナに用いられるシール部材及び攪拌パドルの回転軸端部周辺の断面図である。図4及び図5に示すように、攪拌パドル41の回転軸42はケーシング30の軸受け孔50に挿入されており、回転軸42は軸受け孔50において回転自在に支持されている。また、軸受け孔50からケーシング30の外部に突出する回転軸42の先端にはギヤ45が固定されている。   FIG. 4 is a cross-sectional perspective view of the toner container according to the first embodiment of the present invention in the vicinity of the rotating shaft end portion of the stirring paddle, and FIG. 5 is a seal member and the stirring used in the toner container of the first embodiment. It is sectional drawing of the rotating shaft end part periphery of a paddle. As shown in FIGS. 4 and 5, the rotating shaft 42 of the stirring paddle 41 is inserted into the bearing hole 50 of the casing 30, and the rotating shaft 42 is rotatably supported in the bearing hole 50. A gear 45 is fixed to the tip of the rotating shaft 42 that protrudes from the bearing hole 50 to the outside of the casing 30.

回転軸42の外周面にはケーシング30の内側面30aと対向するフランジ部51が形成されており、フランジ部51とケーシング30の内側面30aとの間には弾性材料で形成されたリング状のシール部材53が配置されている。シール部材53はフランジ部51及び回転軸42の外周面に固定されており、ケーシング30の内側面30aとの間で摺動する。シール部材53は、例えばウレタンフォームやウレタンスポンジ等で成形されたシートをリング状に打ち抜いて形成される。   A flange portion 51 facing the inner side surface 30a of the casing 30 is formed on the outer peripheral surface of the rotating shaft 42, and a ring-shaped member made of an elastic material is formed between the flange portion 51 and the inner side surface 30a of the casing 30. A seal member 53 is disposed. The seal member 53 is fixed to the outer peripheral surfaces of the flange portion 51 and the rotary shaft 42 and slides between the inner surface 30 a of the casing 30. The sealing member 53 is formed by punching a sheet formed of, for example, urethane foam or urethane sponge into a ring shape.

シール部材53に外力を加えない状態では、図5(a)に示すシール部材53の軸方向の厚みTはフランジ部51と内側面30aとの間隔よりも大きくなるように設計されている。そのため、シール部材53はフランジ部51と内側面30aとに挟まれて圧縮され、内側面30aに密着する。これにより、シール部材53と内側面30aとの接触面へのトナーの進入を防止し、ケーシング30の外部へのトナーの漏出を防止している。   When no external force is applied to the seal member 53, the axial thickness T of the seal member 53 shown in FIG. 5A is designed to be larger than the distance between the flange portion 51 and the inner side surface 30a. Therefore, the seal member 53 is sandwiched and compressed between the flange portion 51 and the inner side surface 30a, and is in close contact with the inner side surface 30a. This prevents toner from entering the contact surface between the seal member 53 and the inner side surface 30 a and prevents the toner from leaking out of the casing 30.

また、本実施形態では、図5(b)に示すように、内側面30aのフランジ部51と対向する部分にテーパ部55が形成されており、フランジ部51と内側面30aとの間隔がフランジ部51の径方向外側へ向かうにつれて小さくなっている。一方、図5(a)に示すように、シール部材53の軸方向の厚みTは一定である。従って、シール部材53の圧縮率はフランジ部51の径方向内側から外側へ向かうにつれて連続的に高くなっている。   Further, in the present embodiment, as shown in FIG. 5B, a tapered portion 55 is formed at a portion facing the flange portion 51 of the inner side surface 30a, and the interval between the flange portion 51 and the inner side surface 30a is a flange. It becomes small as it goes to the radial direction outer side of the part 51. FIG. On the other hand, as shown in FIG. 5A, the axial thickness T of the seal member 53 is constant. Accordingly, the compression rate of the seal member 53 is continuously increased from the radially inner side to the outer side of the flange portion 51.

この構成により、シール部材53の径方向外側においてはシール部材53と内側面30aとの密着性が強くなり、トナー攪拌部35から軸受け孔50へのトナーの進入、及び軸受け孔50からケーシング30の外部へのトナーの漏出を確実に防止することができる。また、シール部材53の径方向内側においては内側面30aに対する圧接力が弱くなるため、シール性を安定させるためにシール部材53の径方向の寸法を大きくとっても面圧の変化はほとんどない。従って、回転軸42の駆動トルクを増大させることなく安定したシール性を維持することができる。   With this configuration, the adhesiveness between the seal member 53 and the inner side surface 30a is increased on the outer side in the radial direction of the seal member 53, the toner enters the bearing hole 50 from the toner agitating portion 35, and the casing 30 extends from the bearing hole 50 to the casing 30. Toner leakage to the outside can be reliably prevented. Further, since the pressure contact force with respect to the inner side surface 30a is weak on the radially inner side of the seal member 53, there is almost no change in the surface pressure even if the radial dimension of the seal member 53 is increased in order to stabilize the sealing performance. Therefore, stable sealing performance can be maintained without increasing the driving torque of the rotating shaft 42.

また、シール部材53と内側面30aとの摩擦力も低減されるため、内側面30a或いはシール部材53の発熱、及びそれに伴うトナーの融着も抑制できる。さらに、シール部材53の圧縮率を局所的に高くした場合に比べてシール部材53に加わる負荷が分散されるため、シール部材53の耐久性も向上する。   Further, since the frictional force between the seal member 53 and the inner side surface 30a is also reduced, the heat generation of the inner side surface 30a or the seal member 53 and the accompanying toner fusion can be suppressed. Furthermore, since the load applied to the seal member 53 is dispersed as compared with the case where the compression rate of the seal member 53 is locally increased, the durability of the seal member 53 is also improved.

なお、ここでは攪拌パドル41の一端(図2の前側)の構成について説明するが、攪拌パドル41の他端(図2の後側)についても、ギヤ45が設けられていない以外は基本的に同様であるため説明を省略する。また、ここでは攪拌パドル41の回転軸端部のシール構造について説明したが、トナー供給部33に配置されるスパイラル部材40(図3参照)の回転軸端部のシール構造にも適用できる。   Here, the configuration of one end (front side in FIG. 2) of the agitation paddle 41 will be described, but the other end (rear side in FIG. 2) of the agitation paddle 41 is basically the same except that the gear 45 is not provided. Since it is the same, description is abbreviate | omitted. Although the seal structure at the end of the rotating shaft of the stirring paddle 41 has been described here, the present invention can also be applied to the seal structure at the end of the rotating shaft of the spiral member 40 (see FIG. 3) disposed in the toner supply unit 33.

また、シール部材53をフランジ部51及び回転軸42に固定せず、内側面30aに固定することもできるが、シール部材53とフランジ部51の接触面、及びシール部材53と回転軸42との接触面の2面が摺動面となり、摺動面の面積が大きくなるため回転軸42の駆動トルクも増大する。従って、第1実施形態のようにシール部材53をフランジ部51及び回転軸42の外周面に固定する構成が好ましい。   In addition, the seal member 53 can be fixed to the inner surface 30a without being fixed to the flange portion 51 and the rotary shaft 42, but the contact surface between the seal member 53 and the flange portion 51 and the seal member 53 and the rotary shaft 42 can be fixed. Two of the contact surfaces become sliding surfaces, and the area of the sliding surface increases, so that the driving torque of the rotating shaft 42 also increases. Therefore, the structure which fixes the sealing member 53 to the flange part 51 and the outer peripheral surface of the rotating shaft 42 like 1st Embodiment is preferable.

図6は、本発明の第2実施形態に係るトナーコンテナにおける、攪拌パドルの回転軸端部周辺の断面図である。本実施形態では、内側面30aに代えてフランジ部51側にテーパ部55が形成されており、フランジ部51と内側面30aとの間隔が回転軸42の径方向外側へ向かうにつれて小さくなっている。また、シール部材53は第1実施形態の図5(a)と同様であり、軸方向の厚みTは一定である。   FIG. 6 is a cross-sectional view of the vicinity of the rotating shaft end portion of the stirring paddle in the toner container according to the second embodiment of the present invention. In the present embodiment, a tapered portion 55 is formed on the flange portion 51 side instead of the inner side surface 30a, and the interval between the flange portion 51 and the inner side surface 30a becomes smaller toward the radially outer side of the rotating shaft 42. . The seal member 53 is the same as that in FIG. 5A of the first embodiment, and the axial thickness T is constant.

この構成により、第1実施形態と同様に、シール部材53の圧縮率はフランジ部51の径方向外側へ向かうにつれて連続的に高くなる。従って、シール部材53の径方向外側においてはシール部材53と内側面30aとの密着性が強くなり、トナー攪拌部35から軸受け孔50へのトナーの進入、及びケーシング30の外部へのトナーの漏出を確実に防止することができる。また、シール部材53の径方向内側においては内側面30aに対する圧接力が弱くなるため、回転軸42の駆動トルクを低減することができる。また、内側面30a或いはシール部材53の発熱、及びそれに伴うトナーの融着も抑制できる。   With this configuration, as in the first embodiment, the compression rate of the seal member 53 continuously increases toward the radially outer side of the flange portion 51. Accordingly, the adhesiveness between the seal member 53 and the inner side surface 30a is increased on the outer side in the radial direction of the seal member 53, the toner enters the bearing hole 50 from the toner stirring portion 35, and the toner leaks to the outside of the casing 30. Can be reliably prevented. Moreover, since the pressure contact force with respect to the inner side surface 30a becomes weak at the radially inner side of the seal member 53, the driving torque of the rotating shaft 42 can be reduced. Further, the heat generation of the inner surface 30a or the seal member 53 and the accompanying toner fusion can be suppressed.

図7は、本発明の第3実施形態のトナーコンテナに用いられるシール部材及び攪拌パドルの回転軸端部周辺の断面図である。本実施形態では、図7(b)に示すように、フランジ部51は内側面30aに対し略平行に形成されており、フランジ部51と内側面30aとの間隔はフランジ部51の径方向において一定である。一方、図7(a)に示すように、シール部材53の軸方向の厚みは、径方向外側の厚みT1が径方向内側の厚みT2よりも大きく設計されている。   FIG. 7 is a cross-sectional view of the periphery of the rotating shaft end portion of the seal member and the stirring paddle used in the toner container according to the third embodiment of the present invention. In the present embodiment, as shown in FIG. 7B, the flange portion 51 is formed substantially parallel to the inner side surface 30 a, and the interval between the flange portion 51 and the inner side surface 30 a is in the radial direction of the flange portion 51. It is constant. On the other hand, as shown in FIG. 7A, the axial thickness of the seal member 53 is designed such that the radially outer thickness T1 is larger than the radially inner thickness T2.

この構成により、シール部材53をフランジ部51と内側面30aとの間に配置したとき、第1及び第2実施形態と同様にシール部材53の圧縮率はフランジ部51の径方向外側へ向かうにつれて連続的に高くなる。従って、シール部材53の径方向外側においてはシール部材53と内側面30aとの密着性が強くなり、ケーシング30の外部へのトナーの漏出を確実に防止することができる。また、シール部材53の径方向内側においては内側面30aに対する圧接力が弱くなるため、回転軸42の駆動トルクを低減することができる。また、内側面30a或いはシール部材53の発熱、及びそれに伴うトナーの融着も抑制できる。   With this configuration, when the seal member 53 is disposed between the flange portion 51 and the inner side surface 30a, the compression rate of the seal member 53 increases toward the radially outer side of the flange portion 51 as in the first and second embodiments. It becomes higher continuously. Accordingly, the adhesiveness between the seal member 53 and the inner side surface 30a is increased on the radially outer side of the seal member 53, and toner leakage to the outside of the casing 30 can be reliably prevented. Moreover, since the pressure contact force with respect to the inner side surface 30a becomes weak at the radially inner side of the seal member 53, the driving torque of the rotating shaft 42 can be reduced. Further, the heat generation of the inner surface 30a or the seal member 53 and the accompanying toner fusion can be suppressed.

また、本実施形態ではケーシング30や回転軸42の仕様は従来例の図8と同様であり、シール部材53の形状を変更するだけで良いため、ケーシング30や回転軸42の金型の変更等を必要とせず、第1及び第2実施形態に比べて製造コストも安価となる。   In this embodiment, the specifications of the casing 30 and the rotating shaft 42 are the same as those of the conventional example of FIG. 8 and only the shape of the seal member 53 needs to be changed. And the manufacturing cost is lower than that of the first and second embodiments.

その他本発明は、上記実施形態に限定されず、本発明の趣旨を逸脱しない範囲で種々の変更が可能であり、各実施形態を適宜組み合わせた構成も本発明に包含される。例えば、上記第1及び第2実施形態では、ケーシング30の内側面30a、回転軸42のフランジ部51のいずれかにテーパ部55を形成しているが、内側面30a及びフランジ部51の両方にテーパ部55を形成しても良い。また、テーパ部55を形成し、且つ第3実施形態の図7(a)に示した形状のシール部材53を用いても良い。   In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of this invention, and the structure which combined each embodiment suitably is also included by this invention. For example, in the said 1st and 2nd embodiment, although the taper part 55 is formed in either the inner surface 30a of the casing 30, and the flange part 51 of the rotating shaft 42, both the inner surface 30a and the flange part 51 are formed. A tapered portion 55 may be formed. Further, the sealing member 53 having the tapered portion 55 and the shape shown in FIG. 7A of the third embodiment may be used.

また、ここではトナー収容容器として現像ユニット8にトナーを供給するトナーコンテナ9について説明したが、本発明のシール構造を感光体ドラム5にトナーを供給する現像ユニット8に適用しても良いし、トナーコンテナ9と現像ユニット8の間に配置される中間ホッパー、或いはクリーニング装置18により回収された廃棄トナーを貯留するトナー回収容器に適用しても良い。例えば現像ユニット8のシール構造に適用する場合、現像剤攪拌搬送部材のシールのみでなく、現像剤若しくはトナーを担持する現像ローラの回転軸のシールにも適用可能である。   Although the toner container 9 that supplies toner to the developing unit 8 as a toner container has been described here, the seal structure of the present invention may be applied to the developing unit 8 that supplies toner to the photosensitive drum 5. The present invention may be applied to an intermediate hopper disposed between the toner container 9 and the developing unit 8 or a toner collection container for storing waste toner collected by the cleaning device 18. For example, when applied to the seal structure of the developing unit 8, it can be applied not only to the seal of the developer stirring and conveying member but also to the seal of the rotating shaft of the developing roller carrying the developer or toner.

さらに、本発明のトナー収容容器が搭載される画像形成装置としては、図1に示したデジタル複合機に限らず、カラー複写機やモノクロ及びカラープリンタ、ファクシミリ等の、他の画像形成装置にも適用できるのはもちろんである。   Further, the image forming apparatus on which the toner container of the present invention is mounted is not limited to the digital multi-function peripheral shown in FIG. 1, but also to other image forming apparatuses such as a color copying machine, a monochrome and color printer, and a facsimile. Of course it can be applied.

本発明は、現像剤攪拌部材や現像剤搬送部材、現像剤担持体等の回転体を備えた現像剤収容容器に利用可能であり、回転体の回転軸の外周面に、現像剤収容部の内側面に対向するフランジ部を形成し、フランジ部と現像剤収容部の内側面との間に弾性材料で形成されたリング状のシール部材を回転軸方向に圧縮して配置するとともに、フランジ部の径方向外側におけるシール部材の圧縮率をフランジ部の径方向内側に比べて高くしたものである。   INDUSTRIAL APPLICABILITY The present invention can be used for a developer container having a rotating body such as a developer agitating member, a developer conveying member, and a developer carrier, and a developer container is provided on the outer peripheral surface of the rotating shaft of the rotating body. A flange portion facing the inner side surface is formed, and a ring-shaped seal member formed of an elastic material is disposed between the flange portion and the inner side surface of the developer accommodating portion while being compressed in the rotational axis direction. The compression rate of the seal member on the radially outer side is higher than that on the radially inner side of the flange portion.

本発明の利用により、回転軸端部のシール性能を確保しつつ、回転体の駆動トルクの上昇や発熱による現像剤の融着を抑制可能な現像剤収容容器を簡単な構成で提供することができる。   By utilizing the present invention, it is possible to provide a developer container with a simple configuration capable of suppressing the increase in driving torque of the rotating body and the fusion of the developer due to heat generation while ensuring the sealing performance of the rotating shaft end. it can.

9 トナーコンテナ(現像剤収容容器)
30 ケーシング(現像剤収容部)
30a 内側面
33 トナー供給部
35 トナー攪拌部
37 トナー供給口
40 スパイラル部材(回転体)
41 トナー撹拌部材(回転体)
42 回転軸
43 撹拌羽根
50 軸受け孔
51 フランジ部
53 シール部材
55 テーパ部
100 画像形成装置
9 Toner container (developer container)
30 casing (developer housing part)
30a Inner side surface 33 Toner supply part 35 Toner stirring part 37 Toner supply port 40 Spiral member (rotating body)
41 Toner stirring member (rotating body)
42 Rotating shaft 43 Stirring blade 50 Bearing hole 51 Flange portion 53 Seal member 55 Tapered portion 100 Image forming apparatus

Claims (3)

現像剤を収容する現像剤収容部と、
該現像剤収容部の側面に回転可能に支持される回転軸を有する回転体と、
を備えた現像剤収容容器において、
前記回転軸の外周面には、前記現像剤収容部の内側面に対向するフランジ部が形成され、前記フランジ部と前記現像剤収容部の内側面との間には弾性材料で形成されたリング状のシール部材が前記回転軸方向に圧縮されて配置されており、前記フランジ部の径方向外側における前記シール部材の厚みを、前記フランジ部の径方向内側に比べて厚くすることにより、前記フランジ部の径方向外側における前記シール部材の圧縮率を前記フランジ部の径方向内側に比べて高くしたことを特徴とする現像剤収容容器。
A developer accommodating portion for accommodating the developer;
A rotating body having a rotating shaft rotatably supported on a side surface of the developer container;
In a developer container provided with
A flange portion is formed on the outer peripheral surface of the rotation shaft so as to face the inner surface of the developer accommodating portion, and a ring formed of an elastic material is formed between the flange portion and the inner surface of the developer accommodating portion. And a flange-shaped seal member is disposed in a compressed state in the direction of the rotation axis, and the thickness of the seal member on the radially outer side of the flange portion is made larger than that on the radially inner side of the flange portion. A developer container, wherein a compression rate of the seal member on a radially outer side of the portion is higher than that on a radially inner side of the flange portion.
前記シール部材は、前記フランジ部及び前記回転軸の外周面に固定されることを特徴とする請求項1に記載の現像剤収容容器。 The developer container according to claim 1, wherein the seal member is fixed to outer peripheral surfaces of the flange portion and the rotation shaft . 請求項1又は請求項2に記載の現像剤収容容器が搭載された画像形成装置 An image forming apparatus on which the developer container according to claim 1 is mounted .
JP2013141280A 2013-07-05 2013-07-05 Developer container and image forming apparatus having the same Expired - Fee Related JP5542235B2 (en)

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JPS58112769U (en) * 1982-01-28 1983-08-02 富士通株式会社 Bearing seal structure
JPH0954495A (en) * 1995-08-11 1997-02-25 Canon Inc Developing device and process cartridge
JP2000088108A (en) * 1998-09-14 2000-03-31 Minolta Co Ltd Seal structure of periphery of rotary shaft
JP4342834B2 (en) * 2003-05-21 2009-10-14 京セラミタ株式会社 Toner supply device and seal structure

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