JP2001290368A - Developing device and image forming device - Google Patents

Developing device and image forming device

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Publication number
JP2001290368A
JP2001290368A JP2000102111A JP2000102111A JP2001290368A JP 2001290368 A JP2001290368 A JP 2001290368A JP 2000102111 A JP2000102111 A JP 2000102111A JP 2000102111 A JP2000102111 A JP 2000102111A JP 2001290368 A JP2001290368 A JP 2001290368A
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Prior art keywords
auger
developer
stirring chamber
conveying
developing device
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JP2000102111A
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Japanese (ja)
Inventor
Yutaka Miyasaka
Nobuyasu Tamura
Takayuki Ujifusa
裕 宮坂
孝行 氏房
暢康 田村
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Konica Corp
コニカ株式会社
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Abstract

PROBLEM TO BE SOLVED: To eliminate irregular image density occurring on the surface of a print sheet or among print sheets by preventing the irregularity of toner concentration distribution in an original having a high printing ratio. SOLUTION: This developing device is equipped with a 1st auger 451 for supplying developer to a developer carrier 41, a 2nd auger 452 arranged below the 1st auger 451 and carrying the developer in an opposite direction to the 1st auger 451, a 3rd auger 453 arranged below the carrier 41 and carrying the developer in an opposite direction to the 2nd auger 452, a 1st partition 401 partitioning between a 3rd stirring chamber 443 housing the 3rd auger 453 and a 2nd stirring chamber 442 housing the 2nd auger, and a 1st aperture part 471 communicating with the 3rd and the 2nd stirring chambers 443 and 442 at the end of the 1st partition 401 and shifting the developer from the downstream side of the 3rd auger 453 in a developer carrying direction to the upstream side of the 2nd auger 452.

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明は、電子写真方式の複写機、プリンタ、ファクシミリ、及びこれらの機能を有する複合機等の画像形成装置に備えられる現像装置に関する。 The present invention relates to a copying machine of an electrophotographic system, a printer, a facsimile, and a developing device provided in an image forming apparatus such as a complex machine having these functions.

【0002】 [0002]

【従来の技術】従来知られている電子写真方式の複写機等の画像形成装置は、像担持体に帯電及び露光を行い、 Image forming apparatus such as a copying machine of a conventional known electrophotographic method and performs charging and exposure to the image carrier,
静電潜像を形成する。 Forming an electrostatic latent image. 像担持体上に形成された潜像は現像装置によりトナー像となり、転写手段により用紙上に転写される。 The latent image formed on an image bearing member becomes a toner image by the developing device is transferred onto the sheet by the transfer means. その後、定着装置により熱定着され、画像が形成される。 Then, thermally fixed by the fixing device, an image is formed.

【0003】現像装置は、一成分現像剤、又はトナーとキャリアから成る二成分現像剤を用いて像担持体上に形成された静電潜像を現像して可視化している。 [0003] developing unit is visualized by developing the electrostatic latent image formed on an image bearing member by using a one-component developer, or a two-component developer composed of toner and carrier.

【0004】現像領域で現像処理を終了した現像剤のキャリアや余剰のトナーは回収され、補給されるトナーと混合、攪拌され、再び現像に供される。 [0004] Carrier and surplus toner of the developer has finished developing in the developing area is recovered, mixed with the toner to be replenished, stirred, is subjected to re-developing. このような構成の現像装置に用いられる現像剤は、安定したトナー画像を得るために、一定のトナー濃度と帯電量を維持する必要がある。 Developer used in the developing apparatus having such a configuration, in order to obtain a stable toner image, it is necessary to maintain a constant toner density and charge amount. トナー濃度は現像で消費したトナーと補給トナー分布により決定される。 Toner density is determined by the supplied toner distribution and toner consumption in the developing. 帯電量はキャリアとトナーとの混合時の摩擦帯電により決定される。 The charge amount is determined by the mixing time of the frictional charging between the carrier and the toner. 現像装置は、 Developing device,
トナーとキャリアから成る二成分現像剤の攪拌を充分に行い、トナー濃度分布を均一化するとともに、トナーに付与する帯電量を飽和させて、トナー画像の安定化を行っている。 Sufficiently performed agitation of the two-component developer composed of toner and carrier, as well as uniform toner density distribution, to saturate the charge amount to be applied to the toner is performed to stabilize the toner image.

【0005】(第1の問題点)図13は、従来の現像装置の断面図である。 [0005] (first problem) FIG. 13 is a cross-sectional view of a conventional developing apparatus.

【0006】特開平6−51634号公報に開示された現像装置(図13)においては、現像剤供給搬送室A1 [0006] In Japanese Patent Laid-Open developing apparatus disclosed in 6-51634 JP (FIG. 13), the developer supply conveyance chamber A1
に配置された供給オーガ(上オーガ)4S1の一方に隣接する固定された磁界発生手段(磁石体)42を有する現像剤担持体41に現像剤が供給され、磁石体42で現像後、現像済みの現像剤は、現像剤回収搬送室A3に配置された回収オーガ4S3に移動される。 Fixed magnetic field generating means adjacent to one of the deployed supplied auger (upper auger) 4S1 developer to the developer carrying member 41 having a (magnet) 42 is supplied, after the development in the magnet body 42, already developed the developer is moved to the collecting auger 4S3 disposed in the developer collection conveyance chamber A3. 回収オーガ4 Recovery auger 4
S3は、現像剤攪拌搬送室A2内に収容され、搬送方向が反対の撹拌搬送オーガ(下オーガ)4S2に並設された構成のため、回収された現像剤が、直接、撹拌搬送オーガ4S2に移動し、さらに現像剤供給搬送室A1に配置された供給オーガ4S1に搬送されて、トナー補給されないままに再び現像剤担持体41に供給されるといった現象が生じ、印字率の高い原稿に対し、トナー濃度分布にムラが発生し、プリント用紙面内、或いはプリント用紙間で、画像濃度にムラが発生するといった問題が生じた。 S3 is accommodated in the developer stirring and conveying chamber A2, due to the configuration in which the conveying direction are arranged in parallel in opposite agitation conveying auger (lower auger) 4S2, recovered developer directly to the stirring conveyance auger 4S2 move, is conveyed further developer supply conveyance chamber feed auger 4S1 disposed A1, a phenomenon occurs such is supplied to the developer carrying member 41 again remains to be toner supply, to high printing rate document, toner density distribution nonuniformity is generated, the paper in a printing, or between printing paper, a problem uneven image density occurs.

【0007】(第2の問題点)特に、キャリア粒径20 [0007] In particular (second problem), the carrier particle size 20
〜60μmで、トナー粒径が8μm以下の現像剤を使用した場合、撹拌搬送オーガ(下オーガ)4S2の下流側で、現像剤詰まりが発生しやすく、トルク上昇が発生し、最悪の場合は、撹拌搬送オーガ4S2の下流側軸受け部分で、トナーフレークによるロックが発生するといった問題が発生した。 In ~60Myuemu, when the toner particle diameter using the following developer 8 [mu] m, at the downstream side of the agitation conveyance auger (lower auger) 4S2, easily developer clogging occurs, the torque increase occurs, in the worst case, downstream bearing portion of the agitation transport auger 4S2, problem locked by the toner flakes generated occurs. また原因の一つとして、下方から上方に現像剤を移送させることを目的として、撹拌搬送オーガ4S2の搬送力をアップする必要があり、下流側で現像剤がパッキングしやすかったり、軸受け部分に現像剤が入り込み、トナーフレークが発生するといった問題が生じた。 As one of the causes, development for the purpose of transferring the developer from the bottom to top, it is necessary to up the conveying force of the stirring and conveying augers 4S2, or likely to packing the developer on the downstream side, the bearing portion agent enters, problem toner flakes occurs occurs.

【0008】図14(a)は、従来の現像装置におけるプリント枚数に対する現像剤担持体41上のトナー濃度の推移を示す特性図、図14(b)は、現像剤担持体4 [0008] FIG. 14 (a), characteristic diagram showing changes in the concentration of toner on the developer carrying member 41 for the number of prints in the conventional developing device, FIG. 14 (b), the developer carrying member 4
1上のトナー濃度測定位置を示す説明図である。 It is an explanatory view showing a toner density measurement position on one. 図14 Figure 14
(c)は、従来の現像装置におけるプリント枚数に対する記録紙上の画像濃度の推移を示す特性図、図14 (C) is a characteristic diagram showing changes in the image density of the recording paper relative to the print number in the conventional developing device, FIG. 14
(d)は、記録紙P上の画像濃度の測定位置を示す説明図である。 (D) is an explanatory view showing a measurement position of the image density on the recording sheet P.

【0009】これらは何れも高印字率(黒ベタ)の原稿を連続プリントしたものである。 [0009] These are the original high printing rate any (black solid) was continuously printed. 連続プリント過程で、 In continuous printing process,
現像剤担持体41上の図示のA点、B点のトナー濃度をそれぞれ測定した。 A point shown on the developer carrying member 41, the point B toner concentration was measured. また、このA点、B点で現像されるトナー画像の図示のA点、B点の画像濃度をそれぞれ測定した。 Also, the point A, the point A of the illustrated toner image is developed at point B, the image density of the point B was measured.

【0010】従来の現像装置においては、図13に示すように、回収オーガ4S3と攪拌搬送オーガ4S2とが共通の現像剤回収搬送室A3に配置されているため、現像剤担持体41から回収された現像剤が、攪拌搬送オーガ4S2により充分攪拌されずに回収オーガ4S3から直接に現像剤供給搬送室A1に送り込まれて、供給オーガ4S1により攪拌不十分のまま現像剤担持体41上に供給されることがある。 [0010] In the conventional developing apparatus, as shown in FIG. 13, since the collecting auger 4S3 and stirring and transporting auger 4S2 are disposed on a common developer collection conveyance chamber A3, is recovered from the developer carrying member 41 developer is directly from collecting auger 4S3 without being sufficiently agitated by the agitating transporting auger 4S2 to be sent to the developer supply conveyance chamber A1, is supplied onto the left developer carrying member 41 of the agitation insufficient by the supply auger 4S1 there is Rukoto.

【0011】特に、高印字率の原稿を連続プリントするとき、トナー濃度、画像濃度とも、プリント用紙内での濃度ムラ、異なるプリント用紙間での濃度ムラが発生した。 [0011] In particular, when continuously printing a document of a high printing rate, the toner density, image density with the density unevenness in the printing paper, the density unevenness between different print paper occurs.

【0012】 [0012]

【発明が解決しようとする課題】本発明は、上記の問題点を解消して、安定した画像を形成する現像装置及び画像形成装置を提供するものである。 SUMMARY OF THE INVENTION It is an object of the present invention is to solve the above problems, is to provide a developing device and an image forming apparatus for forming a stable image.

【0013】(第1の課題)本発明は、印字率に関係なく、現像剤内のトナー濃度にムラが生じないように構成し、安定した画像濃度が得られるようにする現像装置を提供することを目的とする。 [0013] (first problem) The present invention, regardless of the printing rate, configured to uneven toner density in the developer does not occur, to provide a developing apparatus to make a stable image density can be obtained and an object thereof.

【0014】(第2の課題)本発明は、印字率に関係なく、安定した画像濃度が得られ、かつ現像剤パッキングといった不具合が発生しない現像装置を提供することを目的とする。 [0014] (second problem) The present invention, regardless of the printing ratio, obtained stable image density, and an object of the invention to provide a developing apparatus which does not occur inconvenience developer packing.

【0015】 [0015]

【課題を解決するための手段】上記の第1の課題は、請求項1〜7に記載の現像装置により達成された。 The first object of the Means for Solving the Problems] was achieved by the developing device according to claims 1-7. また、 Also,
上記の第2の課題は、請求項8又は請求項9に記載の現像装置により達成された。 The second problem described above, was achieved by the developing device according to claim 8 or claim 9. 更に、上記の課題は、請求項1〜7に記載の現像装置又は請求項8又は請求項9に記載の現像装置を備えた画像形成装置により達成された。 Furthermore, the above object has been attained by an image forming apparatus including a developing device according to the developing apparatus or claim 8 or claim 9 according to claims 1-7.

【0016】 [0016]

【発明の実施の形態】本発明の現像装置の実施の形態の説明に先立って、本発明の現像装置を複数組搭載した画像形成装置の一例であるカラープリンタの構成を説明する。 DETAILED DESCRIPTION OF THE INVENTION Prior to description of the embodiments of the developing device of the present invention, illustrating the configuration of a color printer as an example of a plurality of sets an image forming apparatus equipped with a developing device of the present invention. 図1は該カラープリンタの構成を示す構成図である。 Figure 1 is a block diagram showing a configuration of the color printer.

【0017】この画像形成装置は、タンデム型カラー画像形成装置と称せられるもので、複数組の画像形成ユニット10Y、10M、10C、10Kと、ベルト状の中間転写体6と給紙搬送手段及び定着装置23とから成る。 [0017] The image forming apparatus is called a tandem type color image forming apparatus, a plurality of image forming units 10Y, 10M, 10C, 10K and paper feed conveying means and the fixing belt-like intermediate transfer member 6 made from the device 23.

【0018】イエロー色の画像を形成する画像形成ユニット10Yは、像担持体(感光体)1Yの周囲に配置された帯電手段2Y、露光手段3Y、現像装置4Y、転写手段7Y、クリーニング手段8Yを有する。 The image forming unit 10Y for forming a yellow image, a charging means 2Y arranged around the image bearing member (photosensitive member) 1Y, an exposure unit 3Y, a developing device 4Y, transfer unit 7Y, the cleaning means 8Y a. マゼンタ色の画像を形成する画像形成ユニット10Mは、感光体1 The image forming unit 10M for forming a magenta image, the photosensitive member 1
M、帯電手段2M、露光手段3M、現像装置4M、転写手段7M、クリーニング手段8Mを有する。 With M, charging means 2M, exposure means 3M, developing device 4M, a transfer unit 7M, a cleaning means 8M. シアン色の画像を形成する画像形成ユニット10Cは、感光体1 The image forming unit 10C for forming a cyan image, the photosensitive member 1
C、帯電手段2C、露光手段3C、現像装置4C、転写手段7C、クリーニング手段8Cを有する。 A C, a charging unit 2C, exposure unit 3C, a developing device 4C, a transfer device 7C, the cleaning means 8C. 黒色画像を形成する画像形成ユニット10Kは、感光体1K、帯電手段2K、露光手段3K、現像装置4K、転写手段7 The image forming unit 10K for forming a black image, the photosensitive member 1K, charging means 2K, exposure means 3K, developing device 4K, a transfer unit 7
K、クリーニング手段8Kを有する。 K, and a cleaning means 8K.

【0019】中間転写体6は、複数のローラ6A,6 [0019] The intermediate transfer body 6, a plurality of rollers 6A, 6
B,6Cにより巻回され、回動可能に支持されている。 B, is wound around a 6C, and is rotatably supported.

【0020】画像形成ユニット10Y、10M、10 [0020] The image forming unit 10Y, 10M, 10
C、10Kより形成された各色の画像は、回動する中間転写体6上に転写手段7Y、7M、7C、7Kにより逐次転写されて(1次転写)、合成されたカラー画像が形成される。 C, the color images formed from 10K are sequentially transferred to a transfer 7Y onto the intermediate transfer member 6 to rotate, 7M, 7C, are sequentially transferred by 7K (1 transfer), is synthesized color image is formed . 給紙カセット20内に収容された用紙Sは、 Sheet S accommodated in the paper feed cassette 20,
給紙手段21により給紙され、レジストローラ22を経て、転写手段7Aに搬送され、用紙S上にカラー画像が転写される(2次転写)。 Is fed by paper feed unit 21, passes through registration rollers 22, is conveyed to the transfer section 7A, a color image is transferred onto the sheet S (2 transfer). カラー画像が転写された用紙Sは、定着装置23により定着処理され、搬送ローラ2 The sheet S on which the color image has been transferred is subjected to fixing processing by the fixing device 23, conveyance roller 2
4、排紙ローラ25に挟持されて機外の排紙トレイ26 4, nipped by paper discharge roller 25 outside of the discharge tray 26
上に載置される。 It is placed on the top.

【0021】一方、転写手段7Aにより用紙Sにカラー画像を転写した後、分離手段7Bにより用紙Sを分離した中間転写体6は、クリーニング手段8Aにより残留トナーが除去される。 Meanwhile, after the color image has been transferred to the sheet S by the transfer unit 7A, the intermediate transfer member 6 which separates the sheet S by the separation means. 7B, residual toner is removed by the cleaning unit 8A.

【0022】(第1の実施の形態)図2は本発明による第1の実施の形態を示す現像装置の断面図、図3は現像剤担持体と複数のオーガの斜視図、図4(a)は現像装置の平面断面図、図4(b)は現像装置の現像剤搬送経路を示す模式図である。 The cross section of the (first embodiment) FIG. 2 is a developing device showing a first embodiment according to the present invention, FIG. 3 is a perspective view of the developer carrying member and a plurality of auger, Fig. 4 (a ) is a plan sectional view of the developing apparatus, Fig. 4 (b) is a schematic diagram showing the developer conveyance path of the developing device.

【0023】現像装置4は、静電潜像を担持する像担持体1に対向して配置され、回転可能に支持された現像剤担持体41と、現像剤担持体41の内部に配置された複数個の磁極を有する磁界発生手段(磁石体)42と、現像剤層厚規制部材43と、現像剤担持体41の軸方向に沿って現像剤を搬送して現像剤担持体41に供給する第1オーガ(供給オーガ)451と、第1オーガ451の下方に配置され第1オーガ451と反対方向に現像剤を搬送するた第2オーガ(攪拌搬送オーガ)452と、現像剤担持体41の下方に配置され現像剤担持体41から回収された現像剤を第2オーガ452と反対方向に現像剤を搬送するた第3オーガ(回収オーガ)453と、から構成されている。 The developing device 4 is disposed to face the image bearing member 1 carrying the electrostatic latent image, a developer bearing member 41 which is rotatably supported, is disposed inside the developer carrying member 41 a magnetic field generating means (magnet) 42 having a plurality of magnetic poles, and supplies a developer layer thickness regulating member 43, and conveys the developer along the axial direction of the developer carrier 41 to the developer carrying member 41 a first auger (feed auger) 451, a second auger (stirring and conveying auger) 452 for conveying the first auger 451 is disposed below the first auger 451 of the developer in the opposite direction, of the developer carrying member 41 a third auger (collecting auger) 453 conveys the developer to the developer recovered from disposed below the developer carrying member 41 in a direction opposite to the second auger 452, and a. なお、図3において、Fは現像装置4の操作者に対して手前側を示し、Rは奥側を示す。 Incidentally, in FIG. 3, F denotes the front side to the operator of the developing device 4, R denotes a rear side.

【0024】現像装置4の現像装置本体40は、第1オーガ451を収容する第1攪拌室441と、第1攪拌室441のほぼ直下に設けられ第2オーガ452を収容する第2攪拌室442と、現像剤担持体41の下方で第2 The developing device main body 40 of the developing device 4 includes a first stirring chamber 441 for accommodating the first auger 451, a second stirring chamber for accommodating the second auger 452 is provided directly below approximately of the first stirring chamber 441 442 When, a below the developer carrier 41 2
攪拌室442に隣接する第3オーガ453を収容する第3攪拌室443と、から構成されている。 A third stirring chamber 443 for accommodating the third auger 453 adjacent to the stirring chamber 442, and a.

【0025】第2攪拌室442と第3攪拌室443とは第1隔壁401により仕切られている。 [0025] and the second stirring chamber 442 and the third stirring chamber 443 are partitioned by the first partition wall 401. 第1隔壁401 The first partition wall 401
の一方の端部に穿設された第1の開口部471は、第3 The first opening 471 that is bored at one end of the third
攪拌室443の第3オーガ453の現像剤搬送方向下流側と、第2攪拌室442の第2オーガ452の現像剤搬送方向上流側とを連通させている。 A developer conveyance direction downstream side of the third auger 453 of the stirring chamber 443, which communicates the developer conveyance direction upstream side of the second auger 452 of the second stirring chamber 442.

【0026】第1隔壁401の他方の端部に穿設された第2開口部472は、第2攪拌室442の第2オーガ4 The second opening 472 bored in the other end portion of the first partition 401, second auger 4 of the second stirring chamber 442
52の現像剤搬送方向下流側と、第1攪拌室441の第1オーガ451の現像剤搬送方向上流側とを連通させている。 52 and the developer conveying direction downstream side of, and communicates the developer conveyance direction upstream side of the first auger 451 of the first stirring chamber 441.

【0027】第2攪拌室442の現像剤搬送方向下流側から第2隔壁402の第2開口部472を通過して第1 The first through the second opening 472 from the developer conveyance direction downstream side of the second stirring chamber 442 second partition 402
攪拌室441に送り込まれた現像剤は、回転する第1オーガ451により下流側に搬送されつつ放出され、現像剤担持体41の外周面に供給される。 Developer fed to the stirring chamber 441 is released while being conveyed to the downstream side by the first auger 451 rotates, is supplied to the outer circumferential surface of the developer carrying member 41. 現像剤担持体41 Developer carrying member 41
の外周面に供給された現像剤は、現像剤層厚規制部材4 The developer supplied to the outer peripheral surface of the developer layer thickness regulating member 4
3により所定の均一な層厚に形成され、現像領域に送られる。 Is formed at a predetermined uniform thickness by 3, it is fed to the developing area.

【0028】現像剤攪拌搬送用の第2オーガ452による現像剤搬送方向下流側のP1位置における単位時間当たりの現像剤搬送量(V1)は、現像剤供給用の第1オーガ451による現像剤搬送方向下流側のP2位置における単位時間当たりの現像剤搬送量(V2)と、現像剤回収用の第3オーガ453による現像剤搬送方向下流側のP3位置における単位時間当たりの現像剤搬送量(V The developer conveying quantity per unit time in the P1 position of the developer conveying direction downstream side of the second auger 452 for developer stirring and conveying (V1) is a developer conveying by the first auger 451 for developer supply developer conveyance amount per unit time in the P2 position of the downstream side (V2) and the developer conveying quantity per unit time in the P3 position of the developer conveying direction downstream side of the third auger 453 for developer collection (V
3)との総和にほぼ等しくなるように構成した(V1= Configured to be substantially equal to the sum of the 3) (V1 =
V2+V3)。 V2 + V3).

【0029】第3の攪拌室443内の第3オーガ453 A third auger 453 in the third agitating chamber 443
の現像剤搬送下流側付近にトナー補給用開口部481を設け、現像剤担持体41から回収された現像剤と、新規トナーとを混合して搬送し、最下流の第1開口部471 The toner supply opening 481 is provided in the vicinity of the developer carrying the downstream side, a developer recovered from the developer carrying member 41, and transported by mixing the new toner, the first opening 471 of the most downstream
から第2攪拌室442内に送り込む。 From feeding into the second stirring chamber 442. トナー補給は、例えば、画像印字率データに応じて、又は、像担持体1上に形成された基準パッチの反射濃度に応じてトナー補給制御を行う。 Toner supply, for example, depending on the print ratio data, or performs toner supply control in accordance with a reflection density of the reference patch formed on the image carrier 1.

【0030】図5(a)は、本発明の現像装置におけるプリント枚数に対する現像剤担持体41上のトナー濃度の推移を示す特性図、図5(b)は、現像剤担持体41 [0030] 5 (a) is a characteristic diagram showing changes in the concentration of toner on the developer carrying member 41 for the number of prints in the developing device of the present invention, FIG. 5 (b), the developer carrying member 41
上のトナー濃度測定位置を示す説明図である。 It is an explanatory view showing a toner density measuring position of the upper. 図5 Figure 5
(c)は、本発明の現像装置におけるプリント枚数に対する記録紙上の画像濃度の推移を示す特性図、図5 (C) is a characteristic diagram showing changes in the image density of the recording paper relative to the print number in the developing device of the present invention, FIG. 5
(d)は、用紙S上の画像濃度の測定位置を示す説明図である。 (D) is an explanatory view showing a measurement position of the image density on the sheet S.

【0031】これらは何れも高印字率(黒ベタ)の原稿を連続プリントしたものである。 [0031] These are the original high printing rate any (black solid) was continuously printed. 連続プリントの過程で、現像剤担持体41上の図示のA点、B点のトナー濃度をそれぞれ測定した。 In continuous printing process, the point A shown on the developer carrying member 41, the point B toner concentration was measured. また、このA点、B点で現像されるトナー画像の図示のA点、B点の画像濃度をそれぞれ測定した。 Also, the point A, the point A of the illustrated toner image is developed at point B, the image density of the point B was measured.

【0032】本発明の現像装置においては、図2に示すように、第2攪拌室442と第3攪拌室443との間に第1隔壁401を設けて、現像剤搬送経路を仕切って分離した結果、現像剤担持体41から回収された現像剤が、第2攪拌室442に搬送されここで第2オーガ45 [0032] In the developing apparatus of the present invention, as shown in FIG. 2, with the first partition wall 401 provided between the second stirring chamber 442 and the third stirring chamber 443 and separated partitions the developer conveying path result, the developer the developer collected from the carrier 41, the second auger 45 where is transported into the second stirring chamber 442
2により充分攪拌された後、第1攪拌室441に送り込まれて、現像剤担持体41上に供給される。 After being sufficiently agitated by 2, it is fed to the first stirring chamber 441, is supplied onto the developer carrying member 41.

【0033】これにより、図5(a),(c)に示すように、多数枚の連続プリントの過程で、トナー濃度、画像濃度の低下は極めて少なく、顕著に改善された。 [0033] Thus, as shown in FIG. 5 (a), (c), in the course of many sheets of continuous printing, the toner concentration, a decrease in image density is very small, is significantly improved.

【0034】特に、高印字率の原稿を連続プリントするとき、トナー濃度、画像濃度とも、プリント用紙内での濃度ムラ、異なるプリント用紙間での濃度ムラの発生が解消された。 [0034] In particular, when continuously printing a document of a high printing rate, the toner density, image density with the density unevenness in the printing paper, the occurrence of density unevenness between different printed sheets is eliminated.

【0035】図6は、本発明の他の実施の形態を示す現像装置である。 [0035] Figure 6 is a developing apparatus according to another embodiment of the present invention. 図6(a)は現像装置の平面断面図、図6(b)は現像装置の現像剤搬送経路を示す模式図である。 6 (a) is a plan sectional view of the developing device, FIG. 6 (b) is a schematic diagram showing the developer conveyance path of the developing device. なお、図面に使用されている符号について、図4と同じ機能を有する部分には、同符号を付している。 Note that reference numerals used in the drawings, parts having the same functions as those in FIG. 4 are given the same reference numerals. また、図4と異なる点を説明する。 Further, referring to differences from the FIG.

【0036】第3攪拌室443内の現像剤搬送下流側付近にトナー補給用開口部482を設け、新規トナーを補給する。 [0036] The toner supply opening 482 is provided in the vicinity of the third developer conveying downstream of the stirring chamber 443, to replenish fresh toner. 第3攪拌室443内のP3位置では、第3オーガ453により搬送される回収現像剤と、トナー補給用開口部482から送られる新規トナーとが合流して、第1開口部471から排出され、第2攪拌室442内の最上流側に投入される。 The P3 position in the third stirring chamber 443, the collected developer conveyed by the third auger 453, and a new toner is joined sent from the toner supply opening 482, is discharged from the first opening 471, It is introduced into the most upstream side in the second stirring chamber 442.

【0037】図7は、本発明の更に他の実施の形態を示す現像装置である。 [0037] Figure 7 is a further development apparatus showing another embodiment of the present invention. 図7(a)は現像装置の平面断面図、図7(b)は現像装置の現像剤搬送経路を示す模式図である。 7 (a) is a plan sectional view of the developing device, FIG. 7 (b) is a schematic diagram showing the developer conveyance path of the developing device. なお、図面に使用されている符号について、 Note that reference numerals used in the drawings,
図4と同じ機能を有する部分には、同符号を付している。 The portions having the same functions as FIG. 4, are denoted by the same reference numerals. また、図4と異なる点を説明する。 Further, referring to differences from the FIG.

【0038】トナー補給用開口部483を、第2攪拌室442内の第2オーガ452の現像剤搬送方向最上流側に設け、新規トナーを直接、第2攪拌室442内に送り込む。 [0038] The toner supply opening 483, provided in the developer carrying direction most upstream side of the second auger 452 in the second stirring chamber 442, directly a new toner is fed into the second stirring chamber 442. 第2攪拌室442内のトナー補給用開口部483 Second toner supply opening 483 of the stirring chamber 442
よりやや下流側に穿設された第3開口部473には、第1攪拌室441内の第1オーガ451により現像剤担持体41に供給されなかった現像剤が第2攪拌室442の上流側に投入される。 Third opening 473 more bored slightly downstream, the developer that is not supplied to the developer carrying member 41 by a first auger 451 in the first stirring chamber 441 upstream of the second stirring chamber 442 It is turned on to. 第2攪拌室442の上流側には、 On the upstream side of the second stirring chamber 442,
第1攪拌室441から投入される現像剤と、第3攪拌室443から搬送される現像剤と、トナー補給用開口部4 A developing agent input from the first stirring chamber 441, the developer conveyed from the third stirring chamber 443, the toner supply opening 4
83から補給される新規トナーとが合流し、攪拌混合されつつ下流側に搬送される。 83 and the new toner to be replenished joined from being conveyed while being stirred and mixed in the downstream side.

【0039】図8は、本発明の更に他の実施の形態を示す現像装置である。 [0039] Figure 8 is a further development apparatus showing another embodiment of the present invention. 図8(a)は現像装置の平面断面図、図8(b)は現像装置の現像剤搬送経路を示す模式図である。 8 (a) is a plan sectional view of the developing device, FIG. 8 (b) is a schematic diagram showing the developer conveyance path of the developing device. なお、図面に使用されている符号について、 Note that reference numerals used in the drawings,
図4と同じ機能を有する部分には、同符号を付している。 The portions having the same functions as FIG. 4, are denoted by the same reference numerals. また、図4と異なる点を説明する。 Further, referring to differences from the FIG.

【0040】第2オーガ452の搬送方向下流側から、 [0040] from the conveying direction downstream side of the second auger 452,
第2隔壁402の一方の端部に設けた第2開口部472 Second opening 472 provided in one end portion of the second partition wall 402
を通過して、第1オーガ451の搬送方向上流側に現像剤を移動搬送させる。 Through the, the developer is moved transported in the transport direction upstream side of the first auger 451. 第1オーガ451により、一部の現像剤は、現像剤担持体41に供給され、その後、第3 The first auger 451, a part of the developer is supplied to the developer carrying member 41, then the third
攪拌室443に配置された第3オーガ453により剥離移動し、残りの現像剤は第1オーガ451の下流位置まで搬送され、合流用開口部475Aを通って、第3攪拌室443に設けられた第3オーガ453の下流側付近に落下する。 Peeled moved by the third auger 453 disposed stirring chamber 443, the remaining developer is conveyed to a downstream position of the first auger 451, through the confluence opening 475A, provided in the third stirring chamber 443 It falls in the vicinity of the downstream side of the third auger 453.

【0041】第3オーガ453が配置された第3攪拌室443と、第2オーガ452が配置された第2攪拌室4 The third stirring chamber 443 by the third auger 453 is arranged, the second stirring chamber second auger 452 is arranged 4
42とは、第1隔壁401により仕切られている。 42 and is partitioned by the first partition wall 401. 第2 The second
攪拌室442と第1オーガ451が配置された第1攪拌室441とは、第2隔壁402により仕切られている。 Agitation chamber 442 and the first stirring chamber 441 by the first auger 451 is disposed are partitioned by a second partition wall 402.

【0042】第1隔壁401には、第3オーガ453の搬送方向下流側から第2オーガ452の搬送方向上流側付近に移動搬送させるための第1開口部471と、合流用開口部475Aとを設けるように構成した。 [0042] First partition wall 401 has a first opening 471 for moving the transport in the vicinity of the upstream side in the conveying direction of the conveying direction downstream side from the second auger 452 of the third auger 453, and a converging opening 475A It was configured to provide. 合流用開口部475A位置に対応する第3オーガ453の合流点と、第3オーガ453搬送方向下流側から第2オーガ4 A merging point of the third auger 453 corresponding to the converging opening 475A position and the second auger 4 from the third auger 453 conveying direction downstream side
52の搬送方向上流側間に設けられたトナー補給用開口部484との間に、トナー濃度センサ49を設けた。 Between the toner supply opening 484 provided between 52 the upstream side in the conveying direction of, providing the toner density sensor 49. トナー濃度センサ49の検出結果に応じて、トナー濃度制御を行う。 In accordance with the detection result of the toner density sensor 49, performs the toner density control.

【0043】(第2の実施の形態)図9は本発明による第2の実施の形態を示す現像装置の断面図であり、図9 [0043] (Second Embodiment) FIG. 9 is a sectional view of the developing device showing a second embodiment according to the present invention, FIG. 9
(a)は中央断面図、図9(b)は奥側の断面図、図9 (A) is a cross-sectional side view, and FIG. 9 (b) is a sectional view of the back side, FIG. 9
(c)は手前側の断面図を示す。 (C) is a sectional view of the front side. 図10(a)は現像装置の右側面断面図、図10(b)は現像装置の現像剤搬送経路を示す模式図である。 10 (a) is a right side sectional view of the developing device, FIG. 10 (b) is a schematic diagram showing the developer conveyance path of the developing device.

【0044】上下に配置された第1攪拌室441、第2 The first stirring chamber 441 disposed above and below, the second
攪拌室442の側方で、第3攪拌室443とは反対側に、第4攪拌室444を配置した。 By laterally of the stirring chamber 442, and the third stirring chamber 443 on the opposite side, and the fourth stirring chamber 444 disposed. 第4攪拌室444内には、第4オーガ454が回転可能に支持されている。 The fourth stirring chamber 444, fourth auger 454 is rotatably supported.
第4オーガ454は、第1オーガ451、第2オーガ4 The fourth auger 454, first auger 451, a second auger 4
52、第3オーガ453と平行に配置されている。 52, are arranged parallel to the third auger 453.

【0045】第3攪拌室443と第2攪拌室442とは第1隔壁401により仕切られている。 The third stirring chamber 443 and the second stirring chamber 442 are partitioned by the first partition wall 401. 第2攪拌室44 The second stirring chamber 44
2と第1攪拌室441とは第2隔壁402により仕切られている。 2 and the first stirring chamber 441 are partitioned by the second partition wall 402. 第2攪拌室442と第4攪拌室444とは第3隔壁403により仕切られている。 A second stirring chamber 442 and the fourth stirring chamber 444 are partitioned by the third partition wall 403. 第4攪拌室444 Fourth stirring chamber 444
と第1攪拌室441とは第4隔壁404により仕切られている。 When the first stirring chamber 441 are partitioned by fourth partition wall 404.

【0046】第1隔壁401には第1開口部471が、 [0046] The first partition wall 401 is the first opening 471,
第2隔壁402には第2開口部472が、第3隔壁40 The second partition wall 402 is a second opening 472, the third partition wall 40
3には第3開口部473が、第4隔壁404には第4開口部474がそれぞれ連通している。 The 3 third opening 473, the fourth partition wall 404 communicates with the fourth opening 474, respectively.

【0047】現像剤担持体41から剥離された現像剤は、第3攪拌室443内の第3オーガ453により搬送されて、第1隔壁401の第1開口部471を通過して、第2攪拌室442内に送り込まれる(図9(b)参照)。 The developer is separated from the developer carrier 41 is transported by the third auger 453 of the third stirring chamber 443, through the first opening 471 of the first partition wall 401, the second stirring It is fed into the chamber 442 (see FIG. 9 (b)).

【0048】第2攪拌室442内では、最上流側のトナー補給用開口部から補給された新規トナーと、第3攪拌室443から搬送された現像剤とが第2オーガ452により攪拌、搬送されて、第3隔壁403の第3開口部4 [0048] Within the second stirring chamber 442, stirred with new toner supplied from the toner supply opening of the uppermost stream side, a developer that has been transported from the third stirring chamber 443 by the second auger 452, it is transported Te, the third opening of the third partition 403 4
73を通過して、第4攪拌室444内の上流側に搬送される(図9(c)参照)。 Through the 73, it is conveyed to the upstream side of the fourth stirring chamber 444 (see FIG. 9 (c)).

【0049】第4攪拌室444内に送り込まれた現像剤は、第4オーガ(現像剤受け渡し搬送オーガ)454により搬送されて、第4隔壁404の第4開口部474を通過して、第1攪拌室441内の上流側に搬送される(図9(b)参照)。 The developer fed into the fourth stirring chamber 444 is transported by the fourth auger (developer delivery conveyor auger) 454, it passes through the fourth opening 474 of the fourth partition wall 404, the first is conveyed to the upstream side of the stirring chamber 441 (see FIG. 9 (b)).

【0050】第1攪拌室441内に送り込まれた現像剤は、第1オーガ451により搬送され、現像剤担持体4 The developer fed into the first stirring chamber 441 is conveyed by the first auger 451, the developer carrying member 4
1に供給される(図9(a)参照)。 Is supplied to the 1 (see FIG. 9 (a)).

【0051】第1オーガ451の最下流側近傍に設けられた第6開口部476からは、余剰の現像剤が第2攪拌室442に還流される(図9(c)参照)。 [0051] From the sixth opening 476 provided on the most downstream side near the first auger 451, the excess developer is returned to the second stirring chamber 442 (see FIG. 9 (c)).

【0052】(第3の実施の形態)図11は本発明による第3の実施の形態を示す現像装置の断面図であり、図11(a)は中央断面図、図11(b)は奥側の断面図、図11(c)は手前側の断面図を示す。 [0052] (Third Embodiment) FIG. 11 is a sectional view of the developing device showing a third embodiment of the present invention, FIG. 11 (a) central sectional view, FIG. 11 (b) back sectional view of the side, FIG. 11 (c) shows a sectional view of the front side. 図12 Figure 12
(a)は現像装置の右側面断面図、図12(b)は現像装置の現像剤搬送経路を示す模式図である。 (A) is a right side sectional view of a developing device, FIG. 12 (b) is a schematic diagram showing the developer conveyance path of the developing device. なお、図面に使用されている符号について、図9、図10と同じ機能を有する部分には、同符号を付している。 Note that reference numerals used in the drawings, FIG. 9, parts having the same functions as those in FIG. 10 are denoted by the same reference numerals. また、第2 In addition, the second
の実施の形態と異なる点を説明する。 It explains the different embodiments.

【0053】第2攪拌室442から排出された現像剤を第1攪拌室441に還流させる第4オーガ455は、現像装置4の奥側から手前側に上昇するように傾斜配置されている。 [0053] The fourth auger 455 for circulating the developer discharged from the second stirring chamber 442 in the first stirring chamber 441 is inclined arranged so as to rise to the front side from the back side of the developing device 4.

【0054】現像剤担持体41から剥離された現像剤は、第3攪拌室443内の第3オーガ453により搬送されて、第1隔壁401の下流側の第1開口部471を通過して、第2攪拌室442内に送り込まれる(図11 [0054] developer carrying member 41 developer stripped from is conveyed by the third auger 453 of the third stirring chamber 443, through the first opening 471 of the downstream side of the first partition wall 401, fed into the second stirring chamber 442 (FIG. 11
(b)参照)。 (B) reference).

【0055】第2攪拌室442内では、最上流側のトナー補給用開口部から補給された新規トナーと、第3攪拌室443から搬送された現像剤とが第2オーガ452により攪拌、搬送されて、第4隔壁404の第5開口部4 [0055] Within the second stirring chamber 442, stirred with new toner supplied from the toner supply opening of the uppermost stream side, a developer that has been transported from the third stirring chamber 443 by the second auger 452, it is transported Te, fifth opening of the fourth partition wall 404 4
75を通過して、第4攪拌室444内の上流側に搬送される(図11(c)参照)。 Through 75, it is conveyed to the upstream side of the fourth stirring chamber 444 (see FIG. 11 (c)).

【0056】第4攪拌室444内に送り込まれた現像剤は、現像剤受け渡し搬送用の傾斜配置された第4オーガ455により搬送されて、斜め上方に搬送され、下流側の第7開口部477より排出され、第1攪拌室441内の上流側に搬送される(図11(b)参照)。 [0056] developer fed into the fourth stirring chamber 444 is conveyed by the fourth auger 455 is arranged obliquely for the developer delivery conveyor, conveyed obliquely upward, the seventh opening 477 of the downstream more discharged and transported to the upstream side in the first stirring chamber 441 (see FIG. 11 (b)).

【0057】第1攪拌室441内に送り込まれた現像剤は、第1オーガ451により搬送され、一部の現像剤は現像剤担持体41に供給される(図11(a)参照)。 [0057] developer fed into the first stirring chamber 441 is conveyed by the first auger 451, a portion of the developer supplied to the developer carrying member 41 (see FIG. 11 (a)).

【0058】第1オーガ451の最下流側近傍に設けられた第6開口部476からは、余剰の現像剤が第2攪拌室442に還流される(図11(c)参照)。 [0058] From the sixth opening 476 provided on the most downstream side near the first auger 451, the excess developer is returned to the second stirring chamber 442 (see FIG. 11 (c)).

【0059】 [0059]

【発明の効果】本発明の現像装置により、現像後の現像剤は、撹拌用現像剤室(第2攪拌室)に回収された後、 The developing apparatus of the present invention, the developer after development, after being collected in the stirred developer chamber (second stirring chamber),
回収オーガ(第3オーガ)によって一方向に回収し、その後、トナーが補給されてから、供給用現像剤室(第1 Collected in one direction by the collecting auger (Third auger), then the toner is replenished, supplying developer chamber (first
攪拌室)に戻される構成になっているから、印字率に関係なく、現像剤内のトナー濃度ムラが生じにくく、画像濃度も安定する。 Since it is configured to be returned to the stirring chamber), regardless of the printing ratio, the toner density unevenness hardly occurs in the developer, the image density is stabilized.

【0060】また、従来例に比べて、搬送力を落とすことができ、また現像剤の受け渡しが行われやすいために、現像剤のパッキングがなくなった。 [0060] Further, as compared with the conventional example, it is possible to drop the conveying force, and to transfer the developer is easily performed, is no longer packing of the developer. これによりトナーフレークといった問題が回避された。 This problem such as toner flakes is avoided.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】カラープリンタの構成を示す構成図。 Figure 1 is a configuration diagram illustrating a color printer configuration.

【図2】本発明による第1の実施の形態を示す現像装置の断面図。 Sectional view of the developing device showing a first embodiment according to the invention, FIG.

【図3】現像剤担持体と複数のオーガの斜視図。 3 is a perspective view of the developer carrying member and a plurality of auger.

【図4】現像装置の平面断面図、及び現像装置の現像剤搬送経路を示す模式図。 Figure 4 is a plan sectional view of the developing apparatus, and a schematic diagram showing the developer conveyance path of the developing device.

【図5】本発明の現像装置におけるプリント枚数に対する現像剤担持体上のトナー濃度の推移を示す特性図、現像剤担持体上のトナー濃度測定位置を示す説明図、プリント枚数に対する記録紙上の画像濃度の推移を示す特性図、記録紙上の画像濃度の測定位置を示す説明図。 [5] characteristic diagram showing changes in the concentration of toner on the developer carrying member to the print number in the developing device of the present invention, explanatory view showing a toner density measurement position on the developer carrying member, the image on the recording paper with respect to the number of prints characteristic diagram showing a change in the concentration, explanatory view showing a measurement position of the image density of the recording paper.

【図6】本発明の他の実施の形態を示す現像装置の平面断面図、及び現像装置の現像剤搬送経路を示す模式図。 Plan sectional view of the developing apparatus according to another embodiment of the invention; FIG, and schematic diagram illustrating a developer conveying path of the developing device.

【図7】本発明の更に他の実施の形態を示す現像装置の平面断面図、及び現像装置の現像剤搬送経路を示す模式図。 [7] Further plan sectional view of the developing apparatus according to another embodiment of the present invention, and schematic diagram illustrating a developer conveying path of the developing device.

【図8】本発明の更に他の実施の形態を示す現像装置の平面断面図、及び現像装置の現像剤搬送経路を示す模式図。 Further plan sectional view of the developing apparatus according to another embodiment of the present invention; FIG, and schematic diagram illustrating a developer conveying path of the developing device.

【図9】本発明による第2の実施の形態を示す現像装置の中央断面図、及び奥側の断面図、手前側の断面図。 Central sectional view of the developing device showing a second embodiment according to the present invention; FIG, and the back side of the cross-sectional view, cross-sectional view of the front side.

【図10】現像装置の右側面断面図、及び現像装置の現像剤搬送経路を示す模式図。 Right side sectional view of FIG. 10 the developing device, and a schematic diagram showing the developer conveyance path of the developing device.

【図11】本発明による第3の実施の形態を示す現像装置の中央断面図、奥側の断面図、手前側の断面図。 [11] a central cross-sectional view of the developing device showing a third embodiment of the present invention, cross-sectional view of the back side, cross-sectional view of the front side.

【図12】現像装置の右側面断面図、現像装置の現像剤搬送経路を示す模式図。 [12] a right side cross-sectional view of the developing apparatus, schematic diagram showing the developer conveyance path of the developing device.

【図13】従来の現像装置の断面図。 Figure 13 is a cross-sectional view of a conventional developing apparatus.

【図14】従来の現像装置におけるプリント枚数に対する現像剤担持体上のトナー濃度の推移を示す特性図、現像剤担持体上のトナー濃度測定位置を示す説明図、プリント枚数に対する記録紙上の画像濃度の推移を示す特性図、記録紙上の画像濃度の測定位置を示す説明図。 [14] characteristic diagram showing changes in the concentration of toner on the developer carrying member to the print number in the conventional developing device, explanatory view showing a toner density measurement position on the developer carrying member, the image density on a recording sheet for printing number characteristic diagram showing changes in an explanatory diagram showing a measurement position of the image density of the recording paper.

【符号の説明】 DESCRIPTION OF SYMBOLS

4,4Y,4M,4C,4K 現像装置 5Y,5M,5C,5K トナー補給手段 10,10Y,10M,10C,10K 画像形成ユニット 40 現像装置本体 401 第1隔壁 402 第2隔壁 403 第3隔壁 404 第4隔壁 41 現像剤担持体(現像スリーブ) 42 磁界発生手段(磁石体) 43 現像剤層厚規制部材 441 第1攪拌室 442 第2攪拌室 443 第3攪拌室 444 第4攪拌室 451 第1オーガ(供給オーガ) 452 第2オーガ(攪拌搬送オーガ) 453 第3オーガ(回収オーガ) 454,455 第4オーガ(現像剤受け渡し搬送オーガ) 471 第1開口部 472 第2開口部 473 第3開口部 474 第4開口部 475 第5開口部 475A 合流用開口部 476 第6開口部 477 第7開口部 481,482 4,4Y, 4M, 4C, 4K developing device 5Y, 5M, 5C, 5K toner replenishing means 10,10Y, 10M, 10C, 10K image forming unit 40 developing apparatus main body 401 first partition 402 second partition 403 third partition 404 the fourth partition wall 41 developer carrying member (developing sleeve) 42 magnetic field generating means (magnet) 43 developer layer thickness regulating member 441 first stirring chamber 442 second stirring chamber 443 third agitating chamber 444 fourth stirring chamber 451 first auger (feed auger) 452 second auger (stirring and conveying auger) 453 third auger (collecting auger) 454 and 455 fourth auger (developer delivery conveyor auger) 471 first opening 472 second opening 473 a third opening 474 the fourth opening 475 fifth opening 475A converging opening 476 sixth opening 477 seventh openings 481, 482 483,484 トナー補給用開口部 49 トナー濃度センサ 483, 484 toner supply opening 49 the toner density sensor

Claims (11)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 静電潜像を担持する像担持体に対向して配置され、回転可能に支持された現像剤担持体と、前記現像剤担持体の内部に配置された複数個の磁極を有する磁界発生手段と、前記現像剤担持体の回転軸方向に沿って現像剤を搬送して前記現像剤担持体に供給する第1オーガと、前記第1オーガを収容する第1攪拌室と、前記第1オーガの下方に配置され前記第1オーガと反対方向に現像剤を搬送する第2オーガと、前記第1攪拌室のほぼ直下に設けられ前記第2オーガを収容する第2攪拌室と、前記現像剤担持体の下方に配置され前記第2オーガと反対方向に現像剤を搬送する第3オーガと、前記第3 1. A disposed opposite the image bearing member for bearing an electrostatic latent image, and rotatably supported developer carrying member, a plurality of magnetic poles disposed inside of said developer carrying member a magnetic field generating means having a first auger supplied to the developer carrier conveys the developer along the axial direction of the developer carrier, a first stirring chamber for accommodating said first auger, a second auger for conveying the developer in the direction opposite to the disposed below said first auger of said first auger, and a second stirring chamber which houses the second auger provided substantially immediately below the first stirring chamber , a third auger for conveying the developer said and is arranged below the developer carrier and the second auger in the opposite direction, the third
    オーガを収容する第3攪拌室と、前記第3攪拌室と第2 A third agitating chamber for accommodating the auger, and the third stirring chamber second
    攪拌室とを仕切る第1隔壁の端部において前記第3攪拌室と第2攪拌室とに連通し前記第3オーガの現像剤搬送方向下流側から前記第2オーガの上流側に移送させるための第1開口部と、を備えたことを特徴とする現像装置。 From the stirring chamber and the separating first said at the end of the partition wall third stirring chamber and the developer conveying direction downstream side of the third auger communicates with the second stirring chamber for transferring the upstream side of the second auger developing apparatus is characterized by comprising a first opening, the.
  2. 【請求項2】 静電潜像を担持する像担持体に対向して配置され、回転可能に支持された現像剤担持体と、前記現像剤担持体の内部に配置された複数個の磁極を有する磁界発生手段と、前記現像剤担持体の回転軸方向に沿って現像剤を搬送して前記現像剤担持体に供給する第1オーガと、前記第1オーガを収容する第1攪拌室と、前記第1オーガの下方に配置され前記第1オーガと反対方向に現像剤を搬送する第2オーガと、前記第1攪拌室のほぼ直下に設けられ前記第2オーガを収容する第2攪拌室と、前記現像剤担持体の下方に配置され前記第2オーガと反対方向に現像剤を搬送する第3オーガと、前記第3 2. A disposed opposite the image bearing member for bearing an electrostatic latent image, and rotatably supported developer carrying member, a plurality of magnetic poles disposed inside of said developer carrying member a magnetic field generating means having a first auger supplied to the developer carrier conveys the developer along the axial direction of the developer carrier, a first stirring chamber for accommodating said first auger, a second auger for conveying the developer in the direction opposite to the disposed below said first auger of said first auger, and a second stirring chamber which houses the second auger provided substantially immediately below the first stirring chamber , a third auger for conveying the developer said and is arranged below the developer carrier and the second auger in the opposite direction, the third
    オーガを収容する第3攪拌室と、前記第3攪拌室と第2 A third agitating chamber for accommodating the auger, and the third stirring chamber second
    攪拌室とを仕切る第1隔壁と、前記第2攪拌室と第1攪拌室とを仕切る第2隔壁と、前記第1隔壁の端部において前記第3攪拌室と第2攪拌室とに連通し前記第3オーガの現像剤搬送方向下流側から前記第2オーガの上流側に移送させるための第1開口部と、前記第2隔壁の端部において前記第2攪拌室と第1攪拌室とに連通し前記第2オーガの現像剤搬送方向下流側から前記第1オーガの上流側に移送させるための第2開口部と、前記第1オーガの搬送方向下流側から前記第3オーガの搬送方向上流側に移送させるための第3開口部と、を備えたことを特徴とする現像装置。 A first partition wall separating the stirring chamber, and a second partition wall separating the second stirring chamber and the first stirring chamber communicates with the third stirring chamber and the second stirring chamber at the end of the first partition wall a first opening in order to transfer the upstream side of the second auger from the developer conveyance direction downstream side of the third auger, the said second second stirring chamber at the end of the partition wall and the first stirring chamber a second opening for the developer conveyance direction downstream side of the communicating said second auger is transported to the upstream side of the first auger, conveying direction upstream of the third auger from the transport direction downstream side of the first auger developing apparatus is characterized in that and a third opening for transferring the side.
  3. 【請求項3】 前記第2オーガによる単位時間当たりに運ばれる現像剤搬送量は、前記第1オーガによる下流側の単位時間当たりに運ばれる現像剤搬送量と、前記第3 3. A developer conveying quantity carried per unit time by the second auger includes a developer conveying quantity carried per unit of downstream time by the first auger, the third
    オーガによる下流側の単位時間当たりに運ばれる現像剤搬送量との総和にほぼ等しくなるように構成したことを特徴とする請求項1又は2に記載の現像装置。 The developing device according to claim 1 or 2, characterized by being configured to be substantially equal to the sum of the developer conveying quantity carried in per unit time downstream by the auger.
  4. 【請求項4】 前記第3攪拌室内に回転可能に配置された前記第3オーガの下流側部にトナー補給用の開口部を設けたことを特徴とする請求項1又は2に記載の現像装置。 4. A developing device according to claim 1 or 2, characterized in that an opening for toner replenishment to the downstream portion of the third auger third rotatably disposed stirring chamber .
  5. 【請求項5】 前記第2開口部は、少なくとも非画像領域に配置されることを特徴とする請求項2に記載の現像装置。 Wherein said second opening, a developing device according to claim 2, characterized in that disposed on at least a non-image area.
  6. 【請求項6】 前記第3開口部は、少なくとも非画像領域に配置されることを特徴とする請求項2に記載の現像装置。 Wherein said third opening, a developing device according to claim 2, characterized in that disposed on at least a non-image area.
  7. 【請求項7】 前記第3オーガの搬送方向下流側で、前記第1オーガの現像剤落下位置から下流側に、トナー濃度センサを設け、前記トナー濃度センサの更に現像剤搬送方向の下流側に、トナー補給用開口部を設けたことを特徴とする請求項2に記載の現像装置。 In 7. downstream side of the third auger, the downstream side from the developer falling position of the first auger, the toner density sensor is provided, the further downstream side in the developer conveying direction of the toner density sensor a developing device according to claim 2, characterized in that a toner supply port portion.
  8. 【請求項8】 静電潜像を担持する像担持体に対向して配置され、回転可能に支持された現像剤担持体と、前記現像剤担持体の内部に配置された複数個の磁極を有する磁界発生手段と、前記現像剤担持体の回転軸方向に沿って現像剤を搬送して前記現像剤担持体に供給する第1オーガと、前記第1オーガを収容する第1攪拌室と、前記第1オーガの下方に配置され前記第1オーガと反対方向に現像剤を搬送する第2オーガと、前記第1攪拌室のほぼ直下に設けられ前記第2オーガを収容する第2攪拌室と、前記現像剤担持体の下方に配置され前記第2オーガと反対方向に現像剤を搬送する第3オーガと、前記第3 8. disposed to face the image bearing member for bearing an electrostatic latent image, and rotatably supported developer carrying member, a plurality of magnetic poles disposed inside of said developer carrying member a magnetic field generating means having a first auger supplied to the developer carrier conveys the developer along the axial direction of the developer carrier, a first stirring chamber for accommodating said first auger, a second auger for conveying the developer in the direction opposite to the disposed below said first auger of said first auger, and a second stirring chamber which houses the second auger provided substantially immediately below the first stirring chamber , a third auger for conveying the developer said and is arranged below the developer carrier and the second auger in the opposite direction, the third
    オーガを収容する第3攪拌室と、前記第1オーガと第2 A third agitating chamber for accommodating the auger, the first auger and the second
    オーガの側方に平行配置され前記第3オーガとは反対側位置に配置され前記第2攪拌室から前記第1攪拌室に現像剤を受け渡し搬送させる第4オーガと、前記第4オーガを収容する第4攪拌室と、前記第3攪拌室と第2攪拌室とを仕切る第1隔壁と、前記第2攪拌室と第1攪拌室とを仕切る第2隔壁と、前記第2攪拌室と第4攪拌室とを仕切る第3隔壁と、前記第1攪拌室と第4攪拌室とを仕切る第4隔壁と、前記第1隔壁の端部において前記第3攪拌室と第2攪拌室とに連通し前記第3オーガの現像剤搬送方向下流側から前記第2オーガの上流側に移送させるための第1開口部と、前記第2隔壁の端部において前記第2攪拌室と第1攪拌室とに連通し前記第1オーガの現像剤搬送方向下流側から前記第1オーガの上流側に移送させるための The parallel arranged the third auger on a side of the auger and fourth auger for delivering conveying the developer from being disposed opposite position the second stirring chamber to the first stirring chamber, for accommodating the fourth auger a fourth stirring chamber, a first partition wall for partitioning said third stirring chamber and the second stirring chamber, a second partition wall separating the second stirring chamber and the first stirring chamber, the second stirring chamber and the fourth a third partition wall separating the stirring chamber, and a fourth partition wall separating the first agitating chamber and the fourth stirring chamber communicates with the third stirring chamber and the second stirring chamber at the end of the first partition wall a first opening in order to transfer the upstream side of the second auger from the developer conveyance direction downstream side of the third auger, the said second second stirring chamber at the end of the partition wall and the first stirring chamber from the developer conveyance direction downstream side of the communicating said first auger for transferring the upstream side of the first auger 2開口部と、前記第2オーガの搬送方向下流側から前記第4オーガの搬送方向上流側に移送させるため前記第3隔壁に設けた第3開口部と、前記第4オーガの搬送方向下流側から前記第1オーガの搬送方向上流側に移送させるため前記第4隔壁に設けた第4開口部と、を備えたことを特徴とする現像装置。 A second opening, a third opening provided in the third partition for transferring the conveying direction upstream side of the fourth auger from the transport direction downstream side of the second auger, the downstream side in the conveying direction of the fourth auger developing apparatus is characterized in that and a fourth opening provided in said fourth partition wall for transferring the conveying direction upstream side of the first auger from.
  9. 【請求項9】 前記第3オーガの搬送方向下流側付近、 9. near the downstream side in the conveying direction of the third auger,
    又は前記第2オーガの搬送方向上流側に、トナー補給用開口部を設けたことを特徴とする請求項8に記載の現像装置。 Or the upstream side in the conveying direction of the second auger, the developing device according to claim 8, characterized in that a toner supply port portion.
  10. 【請求項10】 像担持体上に静電潜像を形成する帯電手段、露光手段と、請求項1〜9の何れか1項に記載の現像装置と、前記現像装置により形成されたトナー像を用紙に転写する転写手段と、前記転写手段に用紙を給送する給紙手段とを有することを特徴とする画像形成装置。 10. A charging means for forming an electrostatic latent image on the image bearing member, an exposing unit, a developing device according to any one of claims 1 to 9, the toner image formed by the developing device an image forming apparatus comprising a transfer unit for transferring the paper, that it has a paper feeding means for feeding the sheet to the transfer unit.
  11. 【請求項11】 像担持体上に静電潜像を形成する帯電手段、露光手段と、異なる色の現像剤をそれぞれ収容した請求項1〜9の何れか1項に記載の現像装置と、前記現像装置により形成されたトナー像を用紙に転写する転写手段と、前記転写手段に用紙を給送する給紙手段とにより、前記用紙上に複数色のトナー像を形成することを特徴とする画像形成装置。 11. images charging means for forming an electrostatic latent image on the carrier, an exposure means, a developing device according to any one of different claims 1-9 in which the color of the developer accommodating respectively, a transfer unit that transfers the toner image formed by the developing device onto the sheet by the sheet feeding means for feeding the sheet to the transfer unit, and forming a toner image of plural colors on the sheet image forming apparatus.
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JP2009015235A (en) * 2007-07-09 2009-01-22 Ricoh Co Ltd Developing apparatus, process cartridge, and image forming apparatus
JP2009025724A (en) * 2007-07-23 2009-02-05 Ricoh Co Ltd Developing device, process cartridge, image forming apparatus, developing method, and image forming method
JP2012037913A (en) * 2011-11-18 2012-02-23 Ricoh Co Ltd Developing device and image forming device
CN103309211A (en) * 2012-03-15 2013-09-18 佳能株式会社 Developing apparatus
US20130243489A1 (en) * 2012-03-15 2013-09-19 Canon Kabushiki Kaisha Developing apparatus
JP2013190758A (en) * 2012-03-15 2013-09-26 Canon Inc Developing device
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EP2639649A3 (en) * 2012-03-15 2016-12-07 Canon Kabushiki Kaisha Developing apparatus
JP2014081540A (en) * 2012-10-17 2014-05-08 Fuji Xerox Co Ltd Developing apparatus and image forming apparatus
JP2014174315A (en) * 2013-03-08 2014-09-22 Ricoh Co Ltd Image forming method, image forming apparatus, and process cartridge

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