JP4700839B2 - Development device - Google Patents

Development device Download PDF

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Publication number
JP4700839B2
JP4700839B2 JP2001152213A JP2001152213A JP4700839B2 JP 4700839 B2 JP4700839 B2 JP 4700839B2 JP 2001152213 A JP2001152213 A JP 2001152213A JP 2001152213 A JP2001152213 A JP 2001152213A JP 4700839 B2 JP4700839 B2 JP 4700839B2
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Prior art keywords
developer
forming apparatus
image forming
heat pipe
developing device
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JP2002351213A (en
Inventor
樹明 橋本
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Canon Inc
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Canon Inc
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
    • G03G15/0812—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by the developer regulating means, e.g. structure of doctor blade

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dry Development In Electrophotography (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、電子写真方式或は静電記録方式によって像担持体上に形成された静電潜像を粉体の現像剤により現像するための現像装置に関する。
【０００２】
【従来の技術】
従来、電子写真方式等によって画像を形成する複写機、プリンタ、ファクシミリ等の画像形成装置では、静電潜像の現像に際して、図７に示すように、現像剤担持手段３上に現像剤層を形成するために現像剤規制部材６を所定の間隔をもって配設し、現像剤担持手段３の回転によって現像剤Ｔを現像剤規制部材６との近接部６ａに送り込む方法が知られている。この現像剤規制部材６と現像剤担持手段３の摺擦部における摩擦熱による現像剤規制部材６又は現像剤担持手段３への現像剤Ｔの融着を防ぐために、図７及び図８に示すように、現像剤規制部材６の表面にヒートシンク７を設けて放熱を促し、且つ、ファンＦによるエアーの吹き付けによって現像剤規制部材６の温度上昇を防止している。尚、図７及び図８において、１は現像装置、２は感光ドラム、４は現像容器、１１，１２，１３は撹拌手段である。
【０００３】
又、特開平０８−２７８６９６号公報には、現像剤規制部材にペルチェ素子を直接当接するよう配設する構成が提案されている。
【０００４】
【発明が解決しようとする課題】
しかしながら、上記従来の構成では、ファンによるエアー吹き付けを行うことによって画像形成装置本体内部での現像剤の飛散が発生し易く、露光部への汚れ等、作像系へ悪影響による画質低下等を引き起こす可能性がある。
【０００５】
又、排熱を十分に行わないと本体内部の温度上昇を引き起こし、感光ドラムやクリーナー部での現像剤の融着を引き起こすため、排熱用のファンやダクト等を追加しなければならず、装置の大型化やファンの稼働音による騒音の悪化に繋がるという問題がある。
【０００６】
更に、ペルチェ素子を現像剤規制部材に直接配設する場合、ペルチェ素子を配設した部分で吸熱を行うため、ペルチェ素子を現像剤規制部材のほぼ全域に配設しなければならず、装置が大型で高価なものとなる。その上、構成的には放熱部が感光ドラム側になるため、結局、その放熱のための放熱手段を設けなければならないという問題があった。
【０００７】
本発明は上記問題に鑑みてなされたもので、その目的とする処は、エアーの吹き付けや大型のペルチェ素子を設けることなく現像剤規制部材の冷却を行うことができ、エアーの影響を軽減して現像剤の飛散を防ぐことができる現像装置を提供することにある。
【０００８】
【課題を解決するための手段】
上記目的を達成するため、請求項１記載の発明は、粉体現像剤を収容した現像剤収容手段と、該現像剤収容手段によって回転自在に支持されて表面に現像剤を担持するローラ状の現像剤担持手段と、現像剤層厚規制部材と、を備えた現像装置と、前記現像剤層厚規制部材表面にヒートパイプを当接させ、該ヒートパイプの一部に冷却手段を設けた画像形成装置において、前記ヒートパイプを画像形成装置本体側に固定し、当該現像装置を画像形成装置本体に装着する場合は前記ヒートパイプが前記現像剤層厚規制部材に当接し、現像装置を画像形成装置本体から取り出す場合は前記ヒートパイプが前記現像剤層厚規制部材から離間するようにしたことを特徴とする。
【００１２】
従って、本発明によれば、ヒートパイプを現像剤層厚規制部材表面に当接させることによって現像剤層厚規制部材の熱をヒートパイプにより移動させることができるため、現像装置の画像形成装置本体端部より離れた部分での冷却が可能になり、現像装置へのファンによるエアーの影響が軽減されて現像剤の飛散を防ぐことができる。
【００１３】
【発明の実施の形態】
以下に本発明の実施の形態を添付図面に基づいて説明する。
【００１４】
＜実施の形態１＞
図１は本発明に係る現像装置を備えた画像形成装置の断面図、図２は本発明に係る現像装置の部分平面図、図３は同現像装置の断面図である。
【００１５】
図１に示す画像形成装置Ａにおいては、像担持体である感光ドラム２の近傍に本発明に係る現像装置１が配設されている。
【００１６】
本発明に係る現像装置１は、図２及び図３に示すように、現像剤収容手段である現像容器４内の感光ドラム２に対向する開口部に現像剤担持手段として回転可能な現像スリーブ３を備えており、該現像スリーブ３は感光ドラム２との間に所定の間隔を保って配設されている。尚、現像スリーブ３の内部には磁界発生手段としての不図示のマグネットローラが固定設置されており、このマグネットローラの表面には現像剤汲み上げ極や現像極等の磁極が配設されている。又、図３において、１１，１２，１３は撹拌手段である。
【００１７】
而して、マグネットローラの現像剤汲み上げ極等によって現像スリーブ３の表面に吸着された現像剤（トナー）Ｔは、現像スリーブ３との間に所定の間隔を保持して配設された現像ブレード６と現像剤層厚規制極の相互作用によって薄層化される。
【００１８】
ところで、現像ブレード６には長手方向にヒートパイプ８が配設されており、該ヒートパイプ８の端部近傍にはペルチェ素子９とヒートシンク７が配設されている。ここで、ペルチェ素子９の吸熱側はヒートパイプ８側に接しており、放熱側はヒートシンク７と接している。そして、ヒートシンク７に対してはファンＦによってエアーが吹き付けられている。
【００１９】
本構成によれば、現像スリーブ３の回転による該現像スリーブ３と現像ブレード６間の摺擦部において発生する摩擦熱をヒートパイプ８で移動させて現像装置１の本体端部より離れた部分での冷却が可能になるため、現像装置１へのエアーの吹き付けや大型のペルチェ素子を設ける必要がなく、現像装置１へのファンＦによるエアーの影響が軽減されて現像剤Ｔの飛散を防ぐことができる。
【００２０】
＜実施の形態２＞
次に、本発明の実施の形態２を図４に基づいて説明する。尚、図４は本実施の形態に係る現像装置の部分平面図であり、本図においては図２及び図３に示したと同一要素には同一符号を付している。
【００２１】
本実施の形態においては、ヒートパイプ８は画像形成装置本体の筐体を構成している側板４１の外側まで延設され、該ヒートパイプ８の端部近傍にはペルチェ素子９とヒートシンク７が配設されている。そして、ペルチェ素子９の吸熱側はヒートパイプ８側に接しており、放熱側はヒートシンク７と接しており、ヒートシンク７に対してはファンＦによってエアーが吹き付けられている。尚、ヒートパイプ８は不図示の画像形成装置本体のステーに固定しても良い。
【００２２】
本構成によれば、ファンＦのエアーがステー４１によって現像装置１側への吹き付けが殆ど遮断されるため、前記実施の形態１の効果がより確実なものとなる。
【００２３】
＜実施の形態３＞
次に、本発明の実施の形態を図５及び図６に基づいて説明する。尚、図５及び図６は本実施の形態に係る現像装置の断面図であり、これらの図においても図２及び図３と同一要素には同一符号を付している。
【００２４】
本実施の形態においては、ヒートパイプ８は、画像形成装置本体のステー２１の固定部２１ａに固定されている。
【００２５】
而して、本構成によれば、前記実施の形態１の効果に加え、現像装置１が画像形成装置本体に対して図６の矢印方向に移動可能になるため、感光ドラム２の表面を傷付けることなく現像装置１を取り出すことが可能になり、この場合、現像装置１の小型化が可能となるために該現像装置１の着脱が容易化するという効果が得られる。
【００２６】
【発明の効果】
以上の説明で明らかなように、本発明によれば、粉体現像剤を収容した現像剤収容手段と、該現像剤収容手段によって回転自在に支持されて表面に現像剤を担持するローラ状の現像剤担持手段と、現像剤層厚規制部材とを有する現像装置において、前記現像剤層厚規制部材表面にヒートパイプを当接させ、該ヒートパイプの一部に冷却手段を設けたため、現像装置へのエアーの吹き付けや大型のペルチェ素子を設けることなく現像剤規制部材の冷却を行うことができ、現像装置へのエアーの影響を軽減して現像剤の飛散を防ぐことができるという効果が得られる。
【図面の簡単な説明】
【図１】本発明に係る現像装置を備えた画像形成装置の断面図である。
【図２】本発明の実施の形態１に係る現像装置の部分平面図である。
【図３】本発明の実施の形態１に係る現像装置の断面図である。
【図４】本発明の実施の形態２に係る現像装置の部分平面図である。
【図５】本発明の実施の形態３に係る現像装置の断面図である。
【図６】本発明の実施の形態３に係る現像装置の断面図である。
【図７】従来の現像装置の断面図である。
【図８】従来の現像装置の部分平面図である。
【符号の説明】
１ 現像装置
２ 感光ドラム
３ 現像スリーブ（現像剤担持手段）
４ 現像容器（現像剤収容手段）
６ 現像ブレード（現像剤層厚規制部材）
７ ヒートシンク
８ ヒートパイプ
９ ペルチェ素子（冷却手段）
Ｔ 現像剤
Ｆ ファン[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a developing device for developing an electrostatic latent image formed on an image carrier by an electrophotographic system or an electrostatic recording system with a powder developer.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in an image forming apparatus such as a copying machine, a printer, or a facsimile that forms an image by an electrophotographic method, a developer layer is formed on a developer carrying means 3 as shown in FIG. In order to form this, a method is known in which the developer regulating member 6 is disposed at a predetermined interval, and the developer T is fed into the proximity portion 6 a with the developer regulating member 6 by the rotation of the developer carrying means 3. In order to prevent the developer T from adhering to the developer regulating member 6 or the developer carrying means 3 due to frictional heat in the rubbing portion between the developer regulating member 6 and the developer carrying means 3, as shown in FIGS. In this way, the heat sink 7 is provided on the surface of the developer regulating member 6 to promote heat dissipation, and the temperature of the developer regulating member 6 is prevented by blowing air from the fan F. 7 and 8, 1 is a developing device, 2 is a photosensitive drum, 4 is a developing container, and 11, 12, and 13 are stirring means.
[0003]
Japanese Patent Application Laid-Open No. 08-278696 proposes a configuration in which a Peltier element is disposed in direct contact with a developer regulating member.
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional configuration, the air blowing by the fan tends to cause the developer to scatter inside the image forming apparatus main body, causing the image quality to deteriorate due to adverse effects on the image forming system, such as dirt on the exposed portion. there is a possibility.
[0005]
Also, if exhaust heat is not sufficient, the temperature inside the main unit will rise, and developer fusion will occur on the photosensitive drum and cleaner, so a fan or duct for exhaust heat must be added, There is a problem that it leads to an increase in the size of the device and noise due to the operating noise of the fan.
[0006]
Further, when the Peltier element is directly disposed on the developer regulating member, the Peltier element has to be disposed almost in the entire area of the developer regulating member in order to absorb heat at the portion where the Peltier element is disposed, Large and expensive. In addition, since the heat radiating portion is on the photosensitive drum side in terms of structure, there is a problem that a heat radiating means for radiating heat must be provided.
[0007]
The present invention has been made in view of the above problems, and the object of the present invention is that the developer regulating member can be cooled without blowing air or providing a large Peltier element, thereby reducing the influence of air. Another object of the present invention is to provide a developing device capable of preventing the scattering of the developer.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in claim 1 includes a developer containing means for containing a powder developer, and a roller-like support that is rotatably supported by the developer containing means and carries the developer on the surface. a developer bearing means, and a developer layer thickness regulating member, a developing device including a heat pipe is brought into contact with the developer layer thickness regulating member surface, provided with cooling means in a portion of the heat pipe image In the forming apparatus, when the heat pipe is fixed to the image forming apparatus main body side and the developing device is attached to the image forming apparatus main body, the heat pipe comes into contact with the developer layer thickness regulating member, and the developing device is image-formed. In the case of taking out from the apparatus main body, the heat pipe is separated from the developer layer thickness regulating member .
[0012]
Therefore, according to the present invention, since the heat of the developer layer thickness regulating member can be moved by the heat pipe by bringing the heat pipe into contact with the surface of the developer layer thickness regulating member, the image forming apparatus main body of the developing device Cooling can be performed at a portion distant from the end portion, and the influence of air from the fan on the developing device can be reduced to prevent the developer from being scattered.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0014]
<Embodiment 1>
FIG. 1 is a sectional view of an image forming apparatus provided with a developing device according to the present invention, FIG. 2 is a partial plan view of the developing device according to the present invention, and FIG. 3 is a sectional view of the developing device.
[0015]
In the image forming apparatus A shown in FIG. 1, a developing device 1 according to the present invention is disposed in the vicinity of a photosensitive drum 2 that is an image carrier.
[0016]
As shown in FIGS. 2 and 3, the developing device 1 according to the present invention has a developing sleeve 3 that can rotate as a developer carrying means in an opening facing the photosensitive drum 2 in a developing container 4 that is a developer containing means. The developing sleeve 3 is disposed with a predetermined distance from the photosensitive drum 2. In addition, a magnet roller (not shown) as a magnetic field generating means is fixedly installed inside the developing sleeve 3, and magnetic poles such as a developer pumping pole and a developing pole are disposed on the surface of the magnet roller. In FIG. 3, 11, 12, and 13 are stirring means.
[0017]
Thus, the developer (toner) T adsorbed on the surface of the developing sleeve 3 by the developer pumping pole of the magnet roller, etc., is disposed with a predetermined distance from the developing sleeve 3. 6 and the developer layer thickness regulating electrode are reduced in thickness.
[0018]
Incidentally, the developing blade 6 is provided with a heat pipe 8 in the longitudinal direction, and a Peltier element 9 and a heat sink 7 are provided in the vicinity of the end of the heat pipe 8. Here, the heat absorption side of the Peltier element 9 is in contact with the heat pipe 8 side, and the heat dissipation side is in contact with the heat sink 7. Air is blown to the heat sink 7 by the fan F.
[0019]
According to this configuration, the frictional heat generated in the rubbing portion between the developing sleeve 3 and the developing blade 6 due to the rotation of the developing sleeve 3 is moved by the heat pipe 8 at a portion away from the end of the main body of the developing device 1. Therefore, it is not necessary to blow air to the developing device 1 or to provide a large Peltier element, and the influence of the air by the fan F on the developing device 1 is reduced to prevent the developer T from being scattered. Can do.
[0020]
<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a partial plan view of the developing device according to the present embodiment, in which the same elements as those shown in FIGS. 2 and 3 are denoted by the same reference numerals.
[0021]
In the present embodiment, the heat pipe 8 extends to the outside of the side plate 41 constituting the housing of the image forming apparatus main body, and the Peltier element 9 and the heat sink 7 are arranged near the end of the heat pipe 8. It is installed. The heat absorption side of the Peltier element 9 is in contact with the heat pipe 8 side, the heat dissipation side is in contact with the heat sink 7, and air is blown to the heat sink 7 by the fan F. The heat pipe 8 may be fixed to a stay of the image forming apparatus main body (not shown).
[0022]
According to this configuration, since the air of the fan F is almost blocked from being blown to the developing device 1 by the stay 41, the effect of the first embodiment is more reliable.
[0023]
<Embodiment 3>
Next, an embodiment of the present invention will be described with reference to FIGS. 5 and 6 are cross-sectional views of the developing device according to the present embodiment. In these drawings, the same elements as those in FIGS. 2 and 3 are denoted by the same reference numerals.
[0024]
In the present embodiment, the heat pipe 8 is fixed to the fixing portion 21a of the stay 21 of the image forming apparatus main body.
[0025]
Thus, according to this configuration, in addition to the effects of the first embodiment, the developing device 1 can move in the direction of the arrow in FIG. 6 with respect to the image forming apparatus main body, so that the surface of the photosensitive drum 2 is damaged. The developing device 1 can be taken out without any problem. In this case, since the developing device 1 can be downsized, the effect of facilitating the attachment and detachment of the developing device 1 can be obtained.
[0026]
【The invention's effect】
As is apparent from the above description, according to the present invention, a developer containing means containing a powder developer, and a roller-like support that is rotatably supported by the developer containing means and carries the developer on the surface. In a developing device having a developer carrying means and a developer layer thickness regulating member, a heat pipe is brought into contact with the surface of the developer layer thickness regulating member, and a cooling means is provided in a part of the heat pipe. It is possible to cool the developer regulating member without blowing air or providing a large Peltier element, reducing the influence of air on the developing device and preventing the developer from scattering. It is done.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an image forming apparatus provided with a developing device according to the present invention.
FIG. 2 is a partial plan view of the developing device according to the first embodiment of the present invention.
FIG. 3 is a cross-sectional view of the developing device according to the first embodiment of the present invention.
FIG. 4 is a partial plan view of a developing device according to a second embodiment of the present invention.
FIG. 5 is a cross-sectional view of a developing device according to Embodiment 3 of the present invention.
FIG. 6 is a cross-sectional view of a developing device according to Embodiment 3 of the present invention.
FIG. 7 is a cross-sectional view of a conventional developing device.
FIG. 8 is a partial plan view of a conventional developing device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Developing apparatus 2 Photosensitive drum 3 Developing sleeve (Developer carrying means)
4 Developer container (developer storage means)
6 Development blade (developer layer thickness regulating member)
7 Heat sink 8 Heat pipe 9 Peltier element (cooling means)
T Developer F Fan

Claims (3)

粉体現像剤を収容した現像剤収容手段と、該現像剤収容手段によって回転自在に支持されて表面に現像剤を担持するローラ状の現像剤担持手段と、現像剤層厚規制部材と、を備えた現像装置と、
前記現像剤層厚規制部材表面にヒートパイプを当接させ、該ヒートパイプの一部に冷却手段を設けた画像形成装置において、
前記ヒートパイプを画像形成装置本体側に固定し、当該現像装置を画像形成装置本体に装着する場合は前記ヒートパイプが前記現像剤層厚規制部材に当接し、現像装置を画像形成装置本体から取り出す場合は前記ヒートパイプが前記現像剤層厚規制部材から離間するようにしたことを特徴とする画像形成装置。A developer containing means containing a powder developer, a roller-like developer carrying means which is rotatably supported by the developer containing means and carries the developer on its surface, and a developer layer thickness regulating member; A developing device provided;
In the image forming apparatus in which a heat pipe is brought into contact with the surface of the developer layer thickness regulating member, and a cooling unit is provided in a part of the heat pipe .
When the heat pipe is fixed to the main body of the image forming apparatus and the developing device is attached to the main body of the image forming apparatus, the heat pipe comes into contact with the developer layer thickness regulating member and the developing device is taken out from the main body of the image forming apparatus. an image forming apparatus wherein the heat pipe is to be separated from the developer layer thickness regulating member when. 前記ヒートパイプの少なくとも一端を前記画像形成装置の側板から突出させ、前記側板の外側から前記突出部にエアーを吹き付けることで前記ヒートパイプを冷却することを特徴とする請求項１記載の画像形成装置。 2. The image forming apparatus according to claim 1 , wherein at least one end of the heat pipe is protruded from a side plate of the image forming apparatus, and the heat pipe is cooled by blowing air to the protruding portion from the outside of the side plate. . 前記冷却手段をペルチェ素子で構成したことを特徴とする請求項１又は２記載の画像形成装置。The image forming apparatus according to claim 1, wherein the cooling unit includes a Peltier element.
JP2001152213A 2001-05-22 2001-05-22 Development device Expired - Fee Related JP4700839B2 (en)

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JPH05341677A (en) * 1992-06-11 1993-12-24 Ricoh Co Ltd Heat exhaust device for fixing device
JPH06236107A (en) * 1993-02-09 1994-08-23 Canon Inc Wet type developing device
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