JP2005099134A - Developing device - Google Patents

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JP2005099134A
JP2005099134A JP2003330030A JP2003330030A JP2005099134A JP 2005099134 A JP2005099134 A JP 2005099134A JP 2003330030 A JP2003330030 A JP 2003330030A JP 2003330030 A JP2003330030 A JP 2003330030A JP 2005099134 A JP2005099134 A JP 2005099134A
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developer
developing
conveying
container
member
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Osamu Sato
佐藤  修
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Canon Inc
キヤノン株式会社
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<P>PROBLEM TO BE SOLVED: To stabilize image quality by stably maintaining developer in a developing device to an appropriate quantity by solving the problem of variation in ejected quantity of excessive developer due to oscillation or shock in a device main body in a developing device automatically refreshing 2 component developer by a 2 component developer replenishing means for a developing container and a developer ejecting opening 7 overflowing the excessive developer inside the developer container. <P>SOLUTION: The developing device is provided with: the developer container 2 partitioned into a developing chamber storing developer T containing toner and carrier and constituting a circulating path for the developer and an agitating chamber; a developer carrier carrying the developer in the developing chamber to a developing part; the ejecting opening 7 ejecting the excessive developer produced by developer replenishing; and a circulating means provided with a carrying member 4 agitating and carrying the developer inside the agitating chamber and circulating the developer in the circulating path. The carrying member 4 is provided with a first carrying part b with a great carrying ability for developer and a second carrying part c with a smaller carrying ability than the first carrying part (b). The ejecting opening 7 is installed facing the second carrying part (c). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、複写機やレーザープリンタ等において、像担持体上に形成された静電像をトナーとキャリアを混合した現像剤を用いて現像する現像装置に関する。 The present invention, in a copying machine or a laser printer, a developing device for developing with a developer prepared by mixing toner and carrier to an electrostatic image formed on an image bearing member.

従来、乾式複写機等において、トナーとキャリアとからなる2成分現像剤で像担持体表面の静電潜像の可視化、すなわちトナー現像を行う現像装置が用いられている。 Conventionally, in a dry copying machine or the like, visualizing the electrostatic latent image on the image bearing member surface in a two-component developer comprising a toner and a carrier, i.e. a developing device that performs toner development is used. このような現像装置においては、トナーは現像動作によって消費されていく一方、キャリアは消費されずに現像装置内に残る。 In such a developing device, the toner while gradually consumed by a developing operation, the carrier remains in the developing device without being consumed. したがって、現像装置内でトナーと共に攪拌されるキャリアは攪拌頻度が多くなるにつれて、キャリア表面へのトナーの粘着といった事態が生じて汚染され劣化する。 Accordingly, carriers that are stirred with the toner in the developing apparatus as stirring frequency increases, contaminated situation sticking occurs of the toner to the carrier surface is degraded. このために、現像剤の帯電性能が徐々に低下することにより、かぶり(現像剤の帯電性能が低下してくると逆極性に帯電されたトナーが発生し現像時に感光体上の非画像部にトナーが付着する現象)等の画質欠陥を生じて、画質を著しく低下させる原因になっている。 Therefore, by the charging performance of the developer gradually decreases, the head (the non-image portion on the photosensitive member when the toner charging performance of the developer is charged to the opposite polarity when coming lowered occurs developed caused the image defects phenomenon) such that the toner adheres, is causing significantly reduce the image quality.

これまで、かぶり等の画質欠陥が生じないようにするため、定期的に現像容器内の劣化した現像剤を交換する必要があった。 Previously, in order to not to cause image defects head or the like, it is necessary to replace the deteriorated developer regularly developing container. そして、その現像剤を交換するために多大なメンテナンスの労力がかかっていた。 And, it takes a long effort of significant maintenance in order to replace the developer.

そこで現像剤の交換作業を不要にすることを目的に、キャリアとトナーとの混合物からなる現像剤を現像容器内に補給して、帯電性能の低下した劣化現像剤を現像容器より排出し、帯電性能の低下を抑制できるようにした現像装置が提案されている。 Therefore eliminating the need for replacement of the developer for the purpose of, a developer consisting of a mixture of carrier and toner is replenished into the developing container, a reduced degradation developer charging performance was discharged from the developer container, charging the developing device has been proposed to be able to suppress a decrease in performance. この種の技術としては、従来、「トリックル現像方式」と呼ばれる、特許文献1に記載の技術が知られている。 As this kind of technology, conventionally referred to as "trickle developing method", there is known a technique described in Patent Document 1.

この技術は、消費されるトナーの補給とは別に新しいキャリアを現像容器内に補給し、過剰となった現像容器内の現像剤が、現像容器壁面に設けられている現像剤排出口からオーバーフローして排出され、現像剤回収容器に回収される。 This technique, separately new carrier to the replenishment of toner to be consumed is replenished into the developer container, the developer becomes excessive developing container is overflowed from the developer discharge port provided in the developer container wall is discharged Te is recovered in the developer recovery container. このようなキャリア及び劣化現像剤の補給・排出が繰り返し行われることによって、現像容器内で汚染され劣化していく現像剤が、新たに供給されるトナーおよびキャリアに置換されていく。 By such a supply and discharge of carriers and deterioration developer is repeatedly executed, the developer will be contaminated with the developer container deteriorated, it will be substituted in the toner and carrier is newly supplied. これにより、現像剤の帯電性能を維持し、画質の低下を抑えるようになっている。 Thus, to maintain the charging performance of the developer, which is to suppress deterioration of image quality.
特公平2−21591号公報 Kokoku 2-21591 Patent Publication No.

図7〜図10によりトリックル現像システムを採用している現像装置例を説明する。 The developing device example employing a trickle development system will be described by Figures 7-10. 図10のようにこの現像装置1は、キャリアとトナーとの混合物からなる2成分現像剤Tを収容させた現像容器2と、該現像容器内の2成分現像剤を搬送・攪拌しながら現像容器内を容器長手方向に循環させる平行2本の第1と第2の現像剤搬送部材3・4と、その攪拌された2成分現像剤を担持して電子写真感光体等の像担持体Dに適用して像担持体面の静電潜像をトナー像として現像する現像剤担持部材(現像ロール)5と、現像容器内に対する高濃度2成分現像剤補給装置6と、現像容器2内から過剰量の現像剤をオーバーフローさせる現像剤排出口(現像剤回収口)7と、現像剤排出口からオーバーフローした現像剤を収容する廃現像剤貯留容器8等からなる。 The developing apparatus 1 as shown in FIG. 10, a developer container 2 obtained by accommodating the two-component developer T consisting of a mixture of carrier and toner, developer container while conveying and stirring a two-component developer in the developing container first parallel two circulating the inner longitudinal direction of the container and the second developer conveying member 3, 4, the image bearing member D such as an electrophotographic photosensitive member carrying the stirred two-component developer applying a developer carrying member (developing roller) 5 that develops the electrostatic latent image on the image bearing member surface as a toner image by a high concentration two-component developer supplying apparatus 6 to the developing container, excess from the developer vessel 2 the developer discharge port for overflowing the developing agent (developer collecting port) 7, consisting of the waste developer storage container 8, etc. for accommodating the developer overflowed from the developer discharge port.

現像容器2内の2成分現像剤Tは像担持体D面の静電潜像の現像動作によるトナー消費に伴うトナー濃度低下が不図示の検知手段で検知され、トナー濃度が基準濃度よりも低下すると高濃度2成分現像剤補給装置6からトナー濃度を高くした2成分現像剤(トナー+キャリア)が現像容器2内に供給される。 Two-component developer T in the developer container 2 is toner density decreases due to the toner consumption by the developing operation of the electrostatic latent image on the image bearing member surface D is detected by detecting means (not shown), lower than the toner density reference density then the high-concentration two-component developer supplying apparatus 6 2-component developer to increase the toner density from (toner + carrier) is supplied into the developer container 2. この補給された高濃度2成分現像剤は現像容器2内の2成分現像剤T中に現像剤搬送部材3・4で搬送されながら攪拌混合されて現像容器2内の2成分現像剤Tのトナー濃度が上昇する。 The toner of this replenished high concentration two-component developer 2-component developer T of the two-component developer while being conveyed by the developer conveying member 3, 4 are stirred and mixed in the developer container 2 in a T in the developer container 2 concentration increases. そのトナー濃度の上昇が検知手段で検知され、トナー濃度が基準濃度に回復するまで高濃度2成分現像剤補給装置6から現像容器2内への高濃度2成分現像剤の補給がなされる。 Its increase in toner density is detected by the detecting means, supply of the high-concentration two-component developer to the toner concentration is restored to the reference concentration of the high concentration of 2-component developer supplying apparatus 6 to the developer container 2 is made. これにより現像容器2内の現像剤Tはそのトナー濃度が基準濃度範囲内に維持される。 The developer T in the developer container 2 by which the toner density is maintained within the reference concentration range.

一方、現像容器2内に対する高濃度2成分現像剤の補給により、現像容器2内の現像剤Tは消費されないキャリアの追加でその量が増える。 On the other hand, supplementation of a high concentration two-component developer to the developing container 2, the developer T in the developer container 2 the amount is increased with additional carrier is not consumed. 標準的現像剤量より多い分の余剰現像剤は現像剤排出口7から現像容器2外へオーバーフローして廃現像剤貯留容器8に貯留される。 Standard developer amount greater than min excess developer is stored in the waste developer storage container 8 overflows into the developer container 2 out of the developer discharge port 7.

これにより現像容器2内の2成分現像剤Tは高濃度2成分現像剤補給装置6から現像容器2内への高濃度2成分現像剤の補給の繰り返しに伴ない少しずつ自動的に交換されてオートリフレッシュされる。 Thus are 2-component developer T repeated automatically exchanged little In conjunction by the replenishment of the high-concentration two-component developer of high concentration two-component developer supplying apparatus 6 to the developer container 2 in the developer container 2 It is auto-refresh.

図7(a)〜(c)により余剰現像剤のオーバーフロー動作を説明する。 The Figure 7 (a) ~ (c) describing the overflow operation of excess developer. 図7は現像装置1の現像剤排出口7側の部分的断面模型図である。 Figure 7 is a partial schematic sectional view of the developer discharge port 7 side of the developing device 1. 第2の現像剤搬送部材4は中心軸aに該軸に沿ってらせん状にスクリュー羽根bを具備させたスクリュー部材であり、中心軸aの両端部をそれぞれ現像容器2の長手方向両端部の容器壁2a間に軸受け9を介して回転自在に支持させて現像容器2内の配設してある。 The second developer conveying member 4 is a screw member which is provided with a screw blade b helically along the shaft to the center axis a, the central axis at both ends of each developer container 2 of a longitudinal end portions between the vessel wall 2a by rotatably supported via a bearing 9 are disposed in the developer container 2. このスクリュー部材4が所定方向に回転駆動されて該スクリュー部材4に沿う現像剤Tがスクリュー羽根bで攪拌されながらスクリュー部材4に沿って矢印A方向に搬送される。 The screw member 4 is conveyed in the arrow A direction along the screw member 4 while the developer T is driven to rotate along the screw member 4 is agitated by the screw blade b in the predetermined direction. また該スクリュー部材4の現像剤搬送方向下流側のスクリュー羽根部分cのスクリュー形状の向きは、それよりも現像剤搬送方向上流側のスクリュー羽根部分bのスクリュー形状の向きとは逆向きにしてある。 The orientation of the screw shape of the screw blade portion c of the developer conveyance direction downstream side of the screw member 4 is in the opposite direction from that from the developer conveyance direction upstream side of the screw blade portion b screw configuration of the orientation of . この逆向きのスクリュー羽根部分(返しのスクリュー羽根部分)cはスクリュー羽根部分bで搬送されてくる現像剤Tの流れによって該スクリュー部材4の現像剤搬送方向下流側部分の現像剤が軸受け9と中心軸aとの間に侵入するのを防止するために設けてある。 Developer of the screw blade portion c developer conveyance direction downstream side portion of the screw member 4 by the flow of the developer T conveyed by the screw blade portion b (screw blade portion of return) of the opposite direction with the bearing 9 It is provided in order to prevent entry between the central axis a. 図8は上記第2の現像剤搬送部材としてのスクリュー部材4の部分的外観斜視図である。 Figure 8 is a partial perspective view of the screw member 4 serving as the second developer conveying member.

第1の現像剤搬送部材3も上記第2の現像剤搬送部材4と同様の構造のスクリュー部材である。 The first developer conveying member 3 is also a screw member having the same structure as the second developer conveying member 4. ただし、この第1のスクリュー部材3による現像剤Tの搬送方向は上記第2のスクリュー部材4とは逆方向にしてある。 However, the transport direction of the developer T by the first screw member 3 and the second screw member 4 are then in the opposite direction.

上記第1と第2の2本のスクリュー部材3・4の回転により現像容器2内の2成分現像剤Tは攪拌されながら現像容器2内を容器長手方向において循環搬送される。 Two-component developer T in the first and in the developer container 2 by rotation of the second of the two screw member 3, 4 is circulated and conveyed to the developer container 2 in the longitudinal direction of the container while being stirred.

現像剤排出口7は第2のスクリュー部材4の返しのスクリュー羽根部分cに対応する位置の現像容器壁面部分に設けてある。 The developer discharge port 7 is provided in the developer container wall portion at a position corresponding to the screw blade portion c of the return of the second screw member 4. そして該現像剤排出口7の下端(下縁)の高さは現像容器2内の現像剤量が標準的現像剤量である場合に返しのスクリュー羽根部分cの現像剤面に生じる山Taの高さよりも高く設定されている(図7(a))。 And the developer discharge port 7 the lower end of the height mountains Ta occurring developer surface of the screw blade portion c of the return when the developer amount in the developing container 2 is a standard amount of developer (lower edge) is set higher than the height (FIG. 7 (a)).

高濃度2成分現像剤補給装置6から現像容器2内への高濃度2成分現像剤の補給により、現像容器2内の現像剤Tの量が増えると、現像容器2内の現像剤面レベルが現像容器2内の現像剤量が標準的現像剤量である場合よりも高くなり、第2のスクリュー部材4の返しのスクリュー羽根部分cの現像剤面に生じる山Taの高さが図7(b)のように現像剤排出口7の下端の高さよりも高くなり、現像剤排出口7から余剰量分の現像剤Tが現像容器2外にオーバーフローして廃現像剤貯留容器8に貯留される。 Supplementation of the high-concentration two-component developer of high concentration two-component developer supplying apparatus 6 to the developer container 2, the amount of the developer T in the developer container 2 is increased, the developer level in the developer container 2 developer amount in the developing container 2 is higher than when a standard developer amount, the height of the mountain Ta occurring developer surface of the screw blade portion c of the return of the second screw member 4 in FIG. 7 ( b) becomes higher than the height of the lower end of the developer discharge port 7 as excess amount of developer T stored in the waste developer storage container 8 overflows outside the developer container 2 from the developer discharge port 7 that.

1)現像剤搬送部材としてのスクリュー部材3・4はらせん状のスクリュー形状をしているので、現像容器2内の現像剤Tの該スクリュー部材に沿う現像剤面にはスクリューの回転に合わせて図7の(a)や(b)のように波のような凹凸部が発生し、現像剤面が上下動しながら凹凸が移動する。 1) Since the screw member 3, 4 as the developer conveying member has a spiral screw shape, the developer surface along the screw member of the developer T in the developer container 2 in accordance with the rotation of the screw uneven portion such as waves are generated as in (a) or (b) Figure 7, the developer surface irregularities moves while moving up and down. また、現像剤Tは流動性に富んでいるので、現像剤面に発生した凸部(山)Taは振動や衝撃で簡単に崩れる性質をもつ。 Furthermore, the developer T since rich in fluidity, protrusions generated in the developer surface (mountain) Ta has the property of collapse easily by vibration or shock. こういった現像装置が搭載される複写機やプリンタには、振動や衝撃を装置全体に与えるような発生源がいくつもあり、例えば、給紙時に紙をピックアップする時や、図9のような現像ロータリー式のカラープリンターで現像装置が現像位置に停止する際には、大きな振動、衝撃が現像装置に伝わる。 The copying machine or a printer these developing device is mounted, there are a number of sources which gives the whole system a vibration or shock, for example, when picking up the paper during sheet feeding, as shown in FIG. 9 when the developing apparatus in the developing rotary type color printer is stopped at a developing position, a large vibration, shock is transmitted to the developing device. それらの振動や衝撃の発生タイミングによっては、現像剤面に生じた凸形状が崩される場合が生ずる。 Depending generation timing of their vibration and impact, if a convex shape generated on the developer surface is disturbed occurs. すると、図7(b)に対して、図7(c)のように現像剤面の凹凸の崩れで凸部Taが平らになった部分Tbが現像剤排出口7の付近で発生すると、現像剤排出口7に現像剤面が届かず、そのために排出されるはずの現像剤が現像剤排出口7から排出されないという現象が発生する。 Then, with respect to FIG. 7 (b), the the portion Tb of the convex portion Ta is flattened by collapsing the unevenness of the developer surface as shown in FIG. 7 (c) is generated in the vicinity of the developer discharge port 7, the developing agent without the developer surface to reach the discharge port 7, the developer should be discharged to the phenomenon that not discharged from the developer discharge port 7 is generated.

特に、排出量が小さい状況が連続すると、現像容器2内の現像剤Tの総量が増えすぎて現像剤搬送部材としてのスクリュー部材3・4を回転させることが困難になって、最終的には駆動力がその負荷に対して不足して停止してしまうという問題が発生する。 In particular, when the status emissions is small consecutive becomes difficult to rotate the screw member 3, 4 as the developer conveying member total is too many of the developer T in the developer container 2, eventually driving force is a problem that would stop insufficient for the load. あるいは、現像剤Tの総量が増えすぎて、現像剤面が著しく上昇し、現像剤担持体5の表面にコートされる現像剤の量が増え、現像剤担持体5上の現像剤の厚みが増え、像担持体Dと接触することで現像剤が現像剤担持体表面から脱落し現像装置外の本体内を汚染することになる。 Alternatively, too increasing the total amount of the developer T, the developer surface is significantly increased, increasing the amount of the developer to be coated on the surface of the developer carrying member 5, the thickness of the developer on the developer carrying member 5 increased, the developer is able to contaminate the inside of the body out of the developing device off from the surface of the developer carrying member by contacting the image bearing member D.

2)また、図9のように複数の現像装置1(Y・M・C・Bk)が回転体54aに保持された現像ロータリー式の現像ユニット54であるカラープリンターでは、現像装置1(Y・M・C・Bk)が回転するので、回転している間に現像剤が現像剤排出口7から排出されるのを防止するために弁を設けている。 2) Further, in a color printer a plurality of developing devices 1 (Y · M · C · Bk) is developing unit 54 of retained developing rotary to the rotating body 54a as shown in FIG. 9, a developing device 1 (Y · since M · C · Bk) is rotated, the developer while rotating is provided a valve to prevent from being discharged from the developer discharge port 7. 図10は、現像ロータリー式現像ユニットの現像装置1(Y・M・C・Bk)が像担持体Dを現像する位置にある時の主要断面図であり、弁10が取り付けてある。 Figure 10 is a principal sectional view of the developing apparatus 1 of the developing rotary type developing unit (Y · M · C · Bk) is in a position to develop the image bearing member D, it is mounted a valve 10. 弁10には回動するための支点11があり、その支点11は現像装置の上方にあり、弁10は現像装置が図10の現像位置に無いときは自重で現像剤排出口7を塞ぐ。 The valve 10 has a fulcrum 11 for pivoting, the supporting point 11 is located above the developing device, the valve 10 is a developing device closes the developer outlet 7 by its own weight when not in development position of FIG. 10. しかし、図10にあるように現像位置にあるときに、第2の現像剤搬送部材であるスクリュー部材4の回転方向が弁10の閉じる方向に現像剤を運ぶと、弁10全体が現像剤の移動によって閉じる方向に回動してしまい、排出口本来の機能である余剰現像剤の排出という動作が出来なくなる。 However, when in the developing position as in FIG. 10, when the rotation direction of the screw member 4 is a second developer conveying member carries the developer in a direction of closing of the valve 10, the valve 10 as a whole is of the developer Close by the mobile will be rotated in a direction, can not operate in that discharge of the excess developer is outlet original function.

なお、図9の現像ロータリー式カラープリンター自体は公知に属するので、その説明は簡単にとどめる。 The developing rotary type color printer itself in FIG. 9, since belonging to a known, a description thereof will be kept simple. Dは像担持体としての回転ドラム型の電子写真感光体、52は感光体D面を一様に帯電する帯電器、53はその一様帯電面に静電潜像を形成する光像露光装置としてのレーザースキャナー、54はその静電潜像をトナー像として現像する現像ユニットである。 D is an electrophotographic photosensitive member of the rotating drum type as an image bearing member, 52 is a charger for uniformly charging the photoreceptor surface D, 53 optical image exposure device for forming an electrostatic latent image on the uniformly charged surface laser scanner as, 54 is a developing unit for developing the electrostatic latent image as a toner image. この現像ユニット54は現像ロータリー式であり、回転体54aに、イエロー、マゼンタ、シアン、ブラックの4つの色現像装置1Y・1M・1C・1BKを搭載してあり、回転体54aの回転が制御されて所要の現像装置が感光体Dを現像する位置に移動される。 The developing unit 54 is a developing rotary, the rotary body 54a, the yellow, magenta, cyan, Yes equipped with a four color developing devices 1Y · 1M · 1C · 1BK for black, rotation of the rotating body 54a is controlled required of the developing device is moved to a position for developing the photosensitive member D Te. 55は中間転写ベルト、56は1次転写器、57は2次転写器、58は感光体クリーナー、59は給紙機構部、60は定着装置、62は排紙トレイ部である。 55 the intermediate transfer belt, 56 is a primary transfer unit, 57 is the secondary transfer unit, 58 photoconductor cleaner, the 59 paper feed mechanism section, 60 denotes a fixing device, 62 a paper discharge tray portion.

本発明は上記1)や2)の事項に鑑みて提案されたものであり、2成分現像剤を自動的に交換するオートリフレッシュ機能を有する現像装置について、上記1)のような装置本体の振動や衝撃によって余剰現像剤の排出量がバラツク問題を解決し、現像装置内の現像剤を適正量に安定的に維持し、画実を安定させることを目的とする。 The present invention has been proposed in view of the above 1) and 2) matters, the developing device having the auto-refresh function that automatically replace the two-component developer, the vibration of the apparatus main body as described above 1) and impact emissions of excess developer solves fluctuates problem by stably maintaining the proper amount of the developer in the developing device, and an object thereof to stabilize the EMI.

また、上記2)のように、現像ロータリー方式において現像装置の回転中に現像剤排出口からの現像剤の漏れを防止するための弁が現像装置に設けられている場合でも、弁に障害されることなく余剰現像剤を安定して排出させることを目的とする。 Also, as in the above 2), even if the valve to prevent leakage of the developer from the developer discharge port during rotation of the developing apparatus in the developing rotary system is provided in the developing device, it is impaired in the valve aimed at discharging the Rukoto without excess developer stably.

本発明は下記の構成を特徴とする現像装置である。 The present invention is a developing device which is characterized the following configuration.

(1)トナーとキャリアを含んだ現像剤を収容し現像剤の循環経路を構成する現像室と攪拌室とに仕切られた現像容器と、前記現像室内の現像剤を担持して現像部へ搬送する現像剤担持体と、現像剤補給に伴う余剰現像剤を前記攪拌室から排出する排出口と、前記攪拌室内の現像剤を攪拌搬送する搬送部材を備え前記循環経路にて現像剤を循環させる循環手段と、を有する現像装置において、前記搬送部材は現像剤の搬送能力の大きい第1の搬送部と搬送能力の小さい第2の搬送部を有し、前記排出口を前記第2搬送部に対向して設けたことを特徴とする現像装置。 (1) conveying the toner and the developer container is partitioned into a developing chamber and the stirring chamber containing carrier accommodating a developer constituting the circulation path of the developer, and carries the developer of the developing chamber to the developing unit a developer carrying member for a discharge port for discharging the excess developer from the stirring chamber accompanying the developer supply circulates the developer in the circulation path includes a conveying member for conveying stirring the developer in the stirring chamber in the developing device having a circulation means, wherein the conveying member has a second conveying unit and the first conveying portion larger conveying capacity of the developer small carrying capacity, the discharge port to the second conveyor section developing apparatus is characterized by comprising oppositely.

(2)前記第1搬送部は前記攪拌室の循環方向へ現像剤を搬送し、前記第2搬送部は前記攪拌室の循環方向とは逆向きに現像剤を搬送する構成とされ、前記第2の搬送部並びに前記排出口を前記攪拌室から前記現像室への現像剤連通領域内に設けたことを特徴とする(1)の現像装置。 (2) the first conveyor conveys the developer to the circulation direction of the agitating chamber, the second conveyance unit is configured to convey the developer in the opposite direction to the direction of circulation of the stirring chamber, wherein the developing device 2 of the conveying section and the outlet, characterized in that provided in the developer communication area to said developing chamber from the stirring chamber (1).

(3)前記搬送部材は前記第1の搬送部よりも前記第2の搬送部のスクリューピッチが小さいスクリュー部材とされることを特徴とする(1)又は(2)の現像装置。 (3) the developing device of the transport member, characterized in that the screw pitch of the second conveying portion than the first conveying portion is smaller screw member (1) or (2).

(4)前記現像装置の回転に伴って前記排出口から現像剤が漏れ出すのを防止する開閉弁を有し、前記現像装置が現像位置にあるとき前記開閉弁の開閉支点が上側となるように設けたことを特徴とする(1)乃至(3)のいずれかの現像装置。 (4) the in accordance with the rotation of the developing device has an on-off valve to prevent the developer from leaking from the discharge port, said developing device so that the opening and closing fulcrum of the on-off valve when in the development position on the upper side characterized in that provided in (1) to any of the developing device (3).

上記(1)、(2)、(3)の発明によれば、現像剤の総量に応じて、余剰分の現像剤を安定して排出できる。 (1), (2), according to the invention of (3), depending on the total amount of the developer can be stably discharged excess developer. 常に現像容器内の現像剤の量は適正に保たれ、不良画像、駆動トルクアップなどの問題を回避できる。 Always the amount of the developer in the developing container is properly maintained, defective image can avoid problems such as the drive torque up. すなわち、現像容器内から劣化現像剤を常に適正量だけ排出することができるので、一定の帯電性能を安定して維持でき、高画質が維持できる。 That is, it is possible to discharge only always proper amount of degradation developer from the developing container, can be stably maintain a constant charging performance, high image quality can be maintained.

また、(4)の発明によれば、現像ロータリー式の現像装置や画像形成装置においても余剰現像剤を安定して排出することが可能で、常に現像容器内の現像剤の量は適正に保たれ、不良画像、駆動トルクアップなどの問題を回避できる。 Further, (4) According to the invention, also can be stably discharged excess developer in the developing apparatus and an image forming apparatus of the developing rotary, always amount of the developer in the developing container is properly coercive sauce, image defects can be avoided problems such as the drive torque up. すなわち、現像ロータリ式の現像装置で現像剤排出口に弁が設けられている場合でも、同様に劣化現像剤を適正量だけ排出することができるので、一定の帯電性能を安定して維持でき、高画質が維持できる。 That is, even when the valve to the developer discharge opening at the developing rotary type developing apparatus is provided, can be discharged only proper amount of degradation developer similarly, can be stably maintain a constant charging performance, high image quality can be maintained.

(1)画像形成装置例 図1は本実施例における画像形成装置の概略構成模型図である。 (1) Example of Image Forming Apparatus Figure 1 is a schematic configuration model view of an image forming apparatus in this embodiment. 本例の画像形成装置Uは、転写式電子写真プロセス利用、レーザー走査露光方式の複写機である。 The image forming apparatus U according to this embodiment, a transfer type electrophotographic process, a laser scanning exposure system of a copying machine. この複写機Uには、上面部に原稿載置台21が設けられ、この原稿載置台の下に露光光学系22が配設されている。 The copying machine U is document table 21 is provided on the upper surface, the original placement exposure optical system 22 under the table is arranged. 原稿載置台21上に画像面下向きで原稿を載置セットし、コピーボタンを押すと、露光光学系22が原稿載置台21上に載置セットされた原稿の下向き画像面を光電読み取り処理する。 It placed sets the original at the image plane down on the document table 21, pressing the copy button, photoelectric reading process a downward image surface of the original exposure optical system 22 is placed set on the document table 21.

Dは像担持体としての回転ドラム型の電子写真感光体である。 D is an electrophotographic photosensitive member of the rotating drum type as an image bearing member. この感光体Dの外周には、その表面を所定電位に帯電させる帯電器24、感光体Dの表面に形成された静電潜像を現像する現像装置1、感光体Dの表面のトナー像を用紙に転写させる転写帯電器26、感光体表面の残留トナーを回収するクリーニング装置27が設けられている。 The outer periphery of the photosensitive member D, a charger 24 for charging the surface to a predetermined potential, a developing device 1 for developing an electrostatic latent image formed on the surface of the photosensitive member D, the toner image on the surface of the photoreceptor D a transfer charger 26 for transferring the paper, the cleaning device 27 is provided for collecting the residual toner on the photoreceptor surface.

また、感光体Dに対する入紙側には、用紙を所定のタイミングで供給するタイミングローラ対28、搬送ローラ対29・30、第1と第2の給紙カセット31A・31Bおよび給紙ローラ32A・32Bが設けられている。 Further, the input paper side with respect to the photosensitive member D is a pair of timing rollers 28 for supplying sheets at a predetermined timing, the conveyance roller pair 29, 30, the first and-second paper feed cassette 31A, 31B and the sheet feeding roller 32A 32B is provided. 一方、感光体Dに対する出紙側には、用紙上に転写されたトナー像を用紙に定着させる定着装置33が設けられている。 On the other hand, the paper output side with respect to the photosensitive member D is a fixing device 33 is provided for fixing the toner image transferred onto the paper sheet.

まず、回転駆動された感光体Dの表面が帯電器24により一様帯電され、ついで露光装置としてのレーザースキャナー25からのレーザー光25aで走査露光されることにより、感光体Dの表面上に静電潜像が形成され、この潜像が現像装置1によって現像されることにより、感光体Dにトナー画像が形成される。 First, the surface of the rotated photoreceptor D is uniformly charged by the charger 24, followed by being scanned and exposed by the laser beam 25a from the laser scanner 25 as an exposure device, static on the surface of the photoreceptor D electrostatic latent image is formed by the latent image is developed by the developing device 1, a toner image is formed on the photosensitive member D. レーザースキャナー25は露光光学系22で光電読み取りした原稿画像の時系列電気デジタル画素信号に対応して変調されたレーザー光25aを出力して感光体D面に原稿画像に対応した静電潜像を書込み形成する。 The laser scanner 25 is an electrostatic latent image corresponding to an original image in a time-series electric digital pixel signal to corresponding outputs the modulated laser beam 25a photoreceptor surface D of the original image read photoelectrically exposure optical system 22 the writing form.

一方、第1または第2の給紙カセット31Aまたは31Bから給紙ローラ32Aまたは32Bにより記録紙Pが1枚分離給紙され、搬送ローラ対30・29、タイミングローラ対28を経由して、感光体Dと転写帯電器26との間の転写部に所定のタイミングで導入され、転写帯電器26に印加した転写バイアスにより感光体D上のトナー像が記録紙P上に順次に転写されていく。 Meanwhile, the first or second sheet feeding recording paper P by the feed roller 32A or 32B of the cassette 31A or 31B is one separated and fed, the conveying roller pair 30, 29 via the timing roller pair 28, the photosensitive introduced at a predetermined timing to a transfer portion between the body D and the transfer charger 26, the toner image on the photosensitive member D are successively transferred onto the recording sheet P by transfer bias applied to the transfer charger 26 . トナー像が転写された記録紙Pは定着装置33に送られ、そこで加圧および加熱によりトナー像が定着され、永久画像にされて、排紙トレイ34上に排出される。 Recording paper P on which the toner image is transferred is sent to the fixing device 33, where the toner image by pressing and heating is fixed, is the permanent image is discharged onto the discharge tray 34.

また、記録紙Pに対するトナー像転写後に感光体D上に残留したトナーは、クリーニング装置27により除去され、つぎの画像形成に備える。 The toner remaining on the photoreceptor D after the toner image transfer onto the recording sheet P is removed by the cleaning device 27, and the next image formation.

(2)現像装置1 (2) developing device 1
図2は図1の現像装置部分の拡大模型図、図3は該現像装置の現像容器部分の縦断平面図である。 Figure 2 is an enlarged schematic drawing of the developing apparatus portion of FIG. 1, FIG. 3 is a longitudinal plan view of a developer container portion of the developing device. この現像装置1は前述した図7〜図10の現像装置1と同様にトリックル現像システムを採用している現像装置であり、大方の装置構成は図7〜図10の現像装置1と同様であるから共通の構成部材部分には同じ符号を付して再度の説明を省略する。 The developing device 1 is a developing apparatus which employs a trickle development system in the same manner as the developing device 1 in FIGS. 7 to 10 described above, majority of the device configuration is the same as the developing apparatus 1 of FIG. 7 to FIG. 10 the common components portion from the omitted described again denoted by the same reference numerals.

現像容器2に収容する2成分現像剤の非磁性トナーと磁性キャリアの混合比は例えば重量比で1:9程度である。 The mixing ratio of the non-magnetic toner and magnetic carrier of the two-component developer accommodated in the developer container 2 is, for example, the weight ratio is about 1: 9. この比は、トナーの帯電量、キャリアの粒径、画像形成装置の構成などで適正に調整されるべきものであって、必ずしもこの数値に従わなければならないものではない。 This ratio is the charge amount of the toner, the particle size of the carrier, there is to be properly adjusted arrangement like the image forming apparatus does not have to be necessarily conform to this value.

現像容器2は、感光体Dに対向した現像領域の部分が開口しており、この開口部2bに一部露出するようにして、内部にマグネット(円筒状表面に複数の磁極を有する磁石ロール)5aが非回転に配置された現像剤担持体としての現像スリーブ(現像ロール)5が回転可能に設置されている。 Developer container 2 is partially the opening of the developing area opposed to the photoreceptor D, so as to expose a part in the opening 2b, (magnet roll having a plurality of magnetic poles on the cylindrical surface) Magnet therein 5a is a developing sleeve (developing roller) 5 as a developer carrying member disposed in the non-rotating is installed rotatably. 現像スリーブ5は非磁性材料で形成され、現像動作時には図2の矢印方向に回転し、現像容器2内の2成分現像剤Tを保持してブレード12で所定の厚みに規制して、現像領域に搬送し、現像領域で感光体Dに現像剤を供給して、感光体D上に形成されている静電潜像を現像する。 Developing sleeve 5 is formed of a nonmagnetic material, at the time of developing operation rotates in a direction indicated by an arrow in FIG. 2, and restricted to a predetermined thickness by a blade 12 holding the two-component developer T in the developer container 2, a developing area transported to and supplies the developer to the photoreceptor D in the developing area to develop the electrostatic latent image formed on the photoreceptor D. 現像スリーブ5には所定の現像バイアスが印下される。 The developing sleeve 5 predetermined developing bias is made as a sign. 潜像を現像した後の現像剤は、現像スリーブ5の回転にしたがって現像容器2内に回収される。 Developer after developing the latent image is collected in the developer container 2 in accordance with rotation of the developing sleeve 5.

現像容器2内には、第1の現像剤搬送部材としてのスクリュー部材3(現像スリーブ5に近い側)と、第2の現像剤搬送部材としてのスクリュー部材4(現像スリーブ5から遠い側)が平行に設置されている。 The developer container 2, and (the side close to the developing sleeve 5) screw member 3 as a first developer conveying member (the side away from the developing sleeve 5) is a screw member 4 as a second developer conveying member are parallel installed. この第1と第2のスクリュー部材3・4は図3のようにその奥側の軸端にそれぞれギアG1とG2を固着して該両ギアG1・G2を噛合させてあり、ギアG1またはG2に不図示のドライブギアから回転力が伝達されることで第1と第2のスクリュー部材3・4が連動して回転駆動される。 The first and second screw members 3, 4 is Yes in the respective inner side of the shaft end by fixing the gear G1 and G2 are meshed both said gears G1-G2 as shown in FIG. 3, the gear G1 or G2 rotational force is driven to rotate in conjunction the first and second screw members 3, 4 by being transmitted from the drive gear (not shown) to. 第1と第2のスクリュー部材3・4は図2に示した矢印の方向に回転する。 The first and second screw members 3, 4 are rotated in the direction of the arrow shown in FIG.

そして、これら第1と第2のスクリュー部材3・4の回転により現像容器2内の現像剤Tが攪拌混合されながら、第1のスクリュー部材3により図3の矢印の第一の方向に搬送され、第2のスクリュー部材4により上記第一の方向とは逆方向の図3の矢印の第二の方向に搬送されて現像容器2内を図3において破線示の循環経路にて搬送、循環される。 Then, while these first and the developer T in the developer container 2 by the rotation of the second screw member 3, 4 are mixed and stirred, is conveyed by the first screw member 3 in a first direction of the arrow in FIG. 3 , carried by the circulation path of the broken line shows the second screw member 4 by the developer container 2 and the first direction is transported in a second direction of the arrow in the opposite direction of FIG. 3 in FIG. 3, it is circulated that.

第1と第2のスクリュー部材3・4の間には隔壁13が設けられており、現像剤Tの循環が第1と第2のスクリュー部材3・4間でスムーズに行なわれるように、該隔壁13の奥側と手前側とに現像剤受け渡し用の開口部14・15が設けられている。 Between the first and the second screw member 3, 4 and the partition wall 13 is provided, as the circulation of the developer T can be smoothly between the first and second screw members 3, 4, the rear side and the opening portion 14, 15 of the front and the developer for delivery of the partition wall 13 is provided. 隔壁13に隔てられ、第1のスクリュー部材3と、第2のスクリュー部材4が現像剤を攪拌する領域をそれぞれ現像室(第1現像剤攪拌領域)16、攪拌室(第2現像剤攪拌領域)17と呼ぶ。 Spaced partition wall 13, the first screw member 3, the second screw member 4 has a developing region for stirring the developer, respectively chamber (first developer agitating region) 16, agitating chamber (second developer agitating region ) is referred to as 17.

高濃度2成分現像剤補給装置6は、補給用の高濃度2成分現像剤を収容した現像剤ボトル6aを着脱可能に装着する現像剤ボトル装着部と、現像剤ボトル6a内にある攪拌部材(不図示)を駆動して現像剤ボトル6a内の高濃度2成分現像剤を逐次に現像容器2に設けた補給口18から現像容器2内に補給する補給機構部6bとからなる。 High concentration two-component developer supplying apparatus 6, a developer bottle mounting portion for detachably mounting a high concentration second developer bottle 6a containing a component developer for replenishment, stirring member in the developer bottle 6a ( comprising a supply mechanism 6b for replenishing the developer container 2 from the high-concentration two-component developer replenishing port 18 sequentially provided in the developing container 2, not shown) in the developer bottle 6a drives the.

補給口18は図3の2点鎖線示のように第2のスクリュー部材4の上部で、しかも攪拌室17の現像剤流れの上流側に位置し、補給された現像剤は攪拌室17内に落下して供給され攪拌されてから、開口部15を通過して現像室16内に搬送される。 Supplying opening 18 in the upper portion of the second screw member 4 as chain line 2 points 3, moreover positioned upstream of the developer flow agitating chamber 17, replenished developer in the agitating chamber 17 after stirred supplied to fall, it is conveyed to the developing chamber 16 through the opening 15.

高濃度2成分現像剤補給装置6から現像容器2内への新しい現像剤の補給は前述したと同様に、現像容器2内の2成分現像剤Tのトナー消費に伴うトナー濃度低下が不図示の検知手段で検知され、トナー濃度が基準濃度よりも低下すると高濃度2成分現像剤補給装置6からトナー濃度を高くした2成分現像剤(トナー+キャリア)が現像容器2内に供給される。 Similar to the supply of fresh developer from a high concentration two-component developer supplying apparatus 6 to the developer container 2 described above, the toner density decreases due to the toner consumption of the two-component developer T in the developer container 2 is not shown It is detected by the detection means, when the toner concentration is lower than the reference density high density two-component developer supplying apparatus 6 2-component developer to increase the toner density from (toner + carrier) is supplied into the developer container 2. この補給によりトナー濃度の上昇が検知手段で検知され、トナー濃度が基準濃度に回復するまで高濃度2成分現像剤補給装置6から現像容器2内への高濃度2成分現像剤の補給がなされる。 This replenishment higher toner density is detected by the detecting means, supply of the high-concentration two-component developer to the toner concentration is restored to the reference concentration of the high concentration of 2-component developer supplying apparatus 6 to the developer container 2 is made . これにより現像容器2内の現像剤Tはそのトナー濃度が基準濃度範囲内に維持される。 The developer T in the developer container 2 by which the toner density is maintained within the reference concentration range.

上記の現像剤補給に伴う現像容器2内の余剰現像剤の排除は前述したように現像剤排出口(現像剤回収口)7からのオーバーフローでなされる。 Elimination of the surplus developer in the developer container 2 with the above developer supply is done in the overflow from the developer outlet (developer recovery port) 7 as described above. 現像剤排出口7は攪拌室17の現像剤の搬送下流側で、現像スリーブ5から遠い側の現像容器の壁に設けられており、この現像剤排出口7から余剰な現像剤は現像容器外にオーバーフローして廃現像剤貯留容器(回収容器)8に回収される。 In the developer discharge port 7 is transported downstream of the developer in the stirring chamber 17 is provided in a wall of the developing container side far from the developing sleeve 5, the surplus developer from the developer discharge port 7 developing container outside overflow to be collected in the waste developer storage container (collection vessel) 8.

図4(a)のように第2のスクリュー部材4の下流部にはスクリューの向きが逆である返しのスクリュー羽根部分c(図4)があり、この領域での現像剤の流れを反転させて、軸受け9と第2のスクリュー部材4の軸部aの間に侵入しようとする現像剤を、攪拌室17から現像室への現像剤連通領域(開口部15)へ戻そうとする役目を果たす。 FIGS. 4 (a) has a screw blade portion of the downstream portion of the second screw member 4 returns the direction of the screw is reversed c (FIG. 4) as to invert the flow of the developer in this region Te, serves for returning the developer to be entered between the shaft portion a of the bearing 9 and the second screw member 4, to the developer communication area from the stirring chamber 17 to the developing chamber (opening 15) play. 従って、現像剤の流れは2つの矢印AとBの向きになり、スクリュー羽根部分bとスクリュー羽根部分cの向きが変わる変化点での現像剤の量は多くなるが、図4において紙面に垂直な方向に現像剤を掻き出す羽根dが図3に示した開口部15方向にこの領域で増加した現像剤を運ぶ。 Therefore, flow of the developer becomes the direction of the two arrows A and B, the amount of the developer at the change point where the direction changes of the screw blade portion b and the screw blade portion c is increased, but perpendicular to the surface of the paper in FIG. 4 vane d raking the developer in a direction to carry the developer increased in this region in the opening 15 direction shown in FIG. その際、羽根dの端面と現像剤下流方向の現像容器の壁との間の距離mは、開口部15の幅、すなわち隔壁13と現像剤下流方向の現像容器の壁2aとの間の距離n(図3)より小さいことのが好ましい。 At that time, the distance between the end faces of the blade d the distance m between the developer downstream of the developing container wall, the width of the opening 15, i.e. the partition wall 13 and the wall 2a of the developer container developer downstream n preferably be (Fig. 3) smaller than.

第2のスクリュー部材4のスクリュー羽根部分bとcの上部の高さは現像剤排出口7の下端より低く、現像容器2内の現像剤の量が所定の量の範囲内にある場合は図4(a)にあるように現像剤排出口7に現像剤面が届かず現像剤の排出は行われない。 The top of the height of the second screw blade portion b and c of the screw member 4 is lower than the lower end of the developer discharge port 7, if the amount of the developer in the developer container 2 is within a predetermined amount of drawing 4 developer discharge does not reach the developer surface to the developer discharge port 7 as in (a) is not performed. スクリュー部材4のスクリュー羽根はピッチLのらせん形状をしていて、1回転するとL間隔の羽根の間にある現像剤はLだけ運ばれる。 Screw blade of the screw member 4 have a helical shape of the pitch L, the developer existing between the blades of the L intervals when one rotation is transported by L. 羽根の最高点、すなわち現像剤表面に最も近い羽根の上部が山のように凸形状になり、その凸と凸の中間部は凹形状になる。 The highest point of the blade, i.e. the upper portion of the nearest blades to the developer surface becomes convex shape as a mountain, the middle portion of the convex and convex becomes concave. 凸間のピッチもLになって、そのピッチで剤面は波状に凹凸形状になる。 Pitch between convex even if L, and developer surface at the pitch becomes uneven wavy. 図4(b)は図4(a)の状態から1/2×L分の距離だけ現像剤が運ばれた状態図で、凹凸の形状も1/2×L分の距離だけ運ばれる。 4 (b) is a state diagram only developer is transported distance 1/2 × L min from the state of FIG. 4 (a), the shape of irregularities is also carried by a distance of 1/2 × L min.

図4の(a)や(b)のように現像剤面が現像剤排出口7の下端を超えない場合は、現像剤を現像剤排出口7から排出されないが、図4(c)のように、現像剤の総量が増加して剤面の高さが上昇し、現像剤排出口7の最下点に剤の波の凸部が到達して、現像剤排出口7から排出される。 When the developer surface as in (a) or (b) in FIG. 4 does not exceed the lower end of the developer discharge port 7 is not discharged developer from the developer discharge port 7, as shown in FIG. 4 (c) the total amount of the developer increases the height of the increases and developer surface, the convex portions of the wave agent to the lowest point of the developer discharge port 7 has reached, and is discharged from the developer discharge port 7. スクリュー部材4が回転すると現像剤の凸部が順じ現像剤排出口7に到達するので、その度に排出されて、最終的には現像剤面が適正な位置まで低下して、現像剤の量が適正量に安定的に維持される状態に落ち着く。 Since the screw member 4 has a convex portion between the developer rotates reaches sequentially applies the developer discharge port 7, is discharged each time, and eventually reduced to the proper position the developer surface, the developer the amount settles to the state maintained stably in a proper amount.

しかしながら、本現像装置が装備された複写機などでは、給紙などの動作をともなっているので、その給紙動作などによって生じる振動や衝撃が現像装置に伝わって、剤の山が崩される現象が起きる。 However, in a copying machine to which the present developing device is equipped with, since with the operation, such as the paper, a phenomenon that vibration or shock caused by such that the feeding operation is transmitted to the developing device, mountains agent is disturbed Get up. 図4(c)では、現像剤の凸部が現像剤排出口7の近傍に位置する状態での図である。 In FIG. 4 (c), the convex portion of the developer is a diagram of a state located in the vicinity of the developer discharge port 7. このままスクリュー部材4が回転して、現像剤の凸形状が矢印方向に進めばちょうど現像剤の山Taが排出口7の真中の位置にでき、排出口7から現像剤を排出できるはずであるが、図4(c)の状態で振動や衝撃が与えられて凸形状Taが崩れて図4(d)の状態Tbになると、排出される予定であった図4(c)でいう所の現像剤の凸形状Taが図4(d)の状態Tbのように均されて、スクリュー部材4を回転しても現像剤排出口7に入らなくなる。 This remains the screw member 4 is rotated, mountain Ta just developer If all goes convex shape of the developer in the direction of the arrow can be the position of the middle of the discharge port 7, but should be discharged developer from the discharge port 7 When a state Tb shown in FIG. 4 (d) collapses is convex Ta given a vibration or shock in the state of FIG. 4 (c), the development of the place referred to in FIG. 4 was to be discharged (c) convex Ta agents are leveled as in the state Tb in FIG. 4 (d), even if the rotation of the screw member 4 will not enter the developer discharge port 7.

そこで、本実施例では以下のような構成によって、振動、衝撃の影響を受けずに余剰な現像剤を確実に現像剤排出口7に排出するものである。 Accordingly, the following the configuration as in this embodiment, vibration, and discharges the surplus developer to ensure the developer discharge port 7 without being affected by the impact.

図5(a)では、第2のスクリュー部材4の返しのスクリュー羽根部分cのピッチが、それの上流側に設けられ現像剤を順方向に搬送するスクリュー羽根部分bの1/3の長さになっているので、スクリュー部材4が1回転したときの返しのスクリュー羽根部分cでの現像剤搬送量は、それ以外のスクリュー羽根部分bの1/3になる。 In FIG. 5 (a), the length of 1/3 of the second pitch of the screw blade portion c of the return of the screw member 4, the screw blade portion b for conveying the developer provided on the upstream side of it in the forward direction since going on, the developer conveying quantity of a screw blade portion c of the return when the screw member 4 is rotated 1 becomes 1/3 of the other screw blade portion b. すなわち、スクリュー羽根部分bとスクリュー羽根部分cは、それぞれ攪拌室17における搬送部材としての第2のスクリュー部材4の、現像剤の搬送能力の大きい第1の搬送部と、搬送能力の小さい第2の搬送部に対応している。 That is, the screw blade portion b and the screw blade portion c is the second screw member 4 as a carrying member in each stirring chamber 17, a first transfer portion having a large carrying capacity of the developer, a small conveying capacity second It corresponds to the transport unit. であるから、返しのスクリュー羽根部分cの現像剤面の凹凸の高低差は、それ以外のスクリュー羽根部分bの1/3になり、ほとんど平らな状態になる。 Since it is, the height difference of the unevenness of the developer surface of the screw blade portion c of the return, becomes 1/3 of the other screw blade portion b, is almost flat. しかし、凸部がなくなり現像剤排出口7からの排出量が減少することになるので、その場合には図5(b)のように現像剤排出口7の高さを低くするように調節し、適正な排出量を確保できるようにするべきである。 However, since the amount of discharge from the developer discharge port 7 eliminates the projections will be reduced, in which case adjusted to reduce the height of the developer discharge port 7 as shown in FIG. 5 (b) It should be able to ensure proper emissions.

このように、返しのスクリュー羽根部分cのピッチを小さくすると、現像装置1に振動や衝撃が伝わって図5(b)の現像剤面の凸部Taが図5(c)の状態Tbのように崩れても、現像剤面の凹凸の高低差が小さいので、現像剤排出口7から排出する現像剤量のバラツキは小さくなり、図5(c)の状態Tbにおいても余剰現像剤の排出量は安定するというメリットが生まれるのである。 Thus, reducing the pitch of the screw blade portion c of the return, the convex portion Ta of the developer surface in FIG. 5 vibration or impact is transmitted to the developing device 1 (b) is as in a state Tb shown in FIG. 5 (c) even collapses, since height difference of unevenness of the developer surface is small, variation in the amount of developer discharged from the developer discharge port 7 is reduced emissions of excess developer even when Tb shown in FIG. 5 (c) is the benefits that stability is born.

さらに、現像剤排出口7を返しのスクリュー羽根部分cとそれ以外のスクリュー羽根部分bの変化点に対向するような位置に配置すると図5(d)のようになり、現像剤面の高低差の大きい領域に排出口7が対向して存在することになるので、図5(c)のように、現像剤排出口7がスクリューの向きが反転する変化点から返しのスクリュー羽根部cのある領域内に配置されるべきである。 Furthermore, when arranged in a position to face the change point of the screw blade portion c and the other screw blade portion b of the return of the developer discharge port 7 is as FIG. 5 (d), the height difference between the developer surface since the discharge port 7 in the region of high will be present opposite, as in FIG. 5 (c), there is a developer discharge port 7 of the screw blade portion c of the return from the change point of the orientation of the screw is reversed It should be placed in the area. そして、現像剤排出口7は開口部15と対向する領域内に設けるのが好ましい。 The developer discharge port 7 is preferably disposed in the opening 15 facing the region.

前述した図9のように、複数の現像装置1(Y・M・C・Bk)を回転体54aに保持させた現像ロータリー式のカラープリンターでは、現像装置が回転するので回転している間に現像剤が現像剤排出口7から排出されるのを防止するために弁を設けている。 As shown in FIG. 9 described above, the plurality of developing devices 1 (Y · M · C · Bk) a developing rotary which is held by the rotary member 54a color printer, while the developing device is rotated so rotated developer is provided a valve to prevent from being discharged from the developer discharge port 7. 図6は、現像ロータリー式の現像装置が感光体Dを現像する位置(以下では現像位置と呼ぶ)にある時の主要断面図である。 Figure 6 is a principal cross-sectional view when in position the developing rotary type developing device for developing the photosensitive member D (hereinafter referred to as the developing position). 弁10には回動するための支点11があり、その支点11は現像装置の上方にあり、弁10は現像装置が現像位置に無いときは弁10の自重で排出口7は塞がれる。 The valve 10 has a fulcrum 11 for pivoting, the supporting point 11 is located above the developing device, the valve 10 is a developing device is closed at the outlet 7 is the self-weight of the valve 10 when not in the developing position. 現像位置にあるときに、第2の現像剤搬送部材としてのスクリュー部材4の回転方向が弁10を開く方向に現像剤を運び、弁10全体が現像剤の移動によって開く方向に回動する。 When in the developing position, the rotational direction of the screw member 4 as a second developer conveying member carries the developer in a direction of opening the valve 10, the entire valve 10 is rotated in the opening direction by the movement of the developer. 従って、現像剤の量が所定量より増加すると、スクリュー部材4の回転で弁10が開き、現像剤排出口7から余剰現像剤が弁10に障害されることなく排出される。 Therefore, the amount of the developer Increasing than the predetermined amount, the valve 10 is opened by the rotation of the screw member 4, the excess developer is discharged without being impaired valve 10 from the developer discharge port 7.

[その他] [More]
1)現像容器2に対する新しい2成分現像剤の逐次補給に関して、上記の実施例では予めトナー分を多く配合したトナーとキャリアの混合からなる高濃度2成分現像剤を、現像容器内の2成分現像剤のトナー濃度低下に伴うトナー濃度補正動作毎に高濃度2成分現像剤補給装置6から補給するようにしているが、現像容器2に対してトナーとキャリアとを別々に補給するトナー補給装置とキャリア補給装置を具備させ、その両補給装置を連携的に制御することで現像容器内の2成分現像剤のトナー濃度の維持と、現像剤のオートリフレッシュを実行させるようにすることもできる。 1) with respect to the sequential supply of new 2-component developer to the developing container 2, a high concentration two-component developer comprising a mixture of toner and carrier in advance a toner content often formulated in the above embodiments, two-component developer in the developing container While the toner density correction operation every time due to the toner density loss agent from a high concentration two-component developer supplying apparatus 6 so as to replenish the toner supply device for replenishing separately toner and carrier to the developer container 2 the carrier supply device is provided, it may be so as to execute and maintain the toner density of the two-component developer in the developing container by cooperation controlling the two supply device, an auto-refresh of the developer. 本発明においてこの形態も、現像容器内に新しい2成分現像剤を補給する現像剤補給手段の範疇である。 The embodiment in the present invention is also a category of developer supply means for supplying a new two-component developer in the developing container.

2)攪拌室17における搬送部材としての第2のスクリュー部材4の、現像剤の搬送能力の大きい第1の搬送部bと、搬送能力の小さい第2の搬送部cにおいて、搬送能力の小さい第2の搬送部cは返しのスクリュー羽根部分の形態にしなくてもよく、第1の搬送部bのスクリュー羽根部分と同じ向きのスクリュー羽根とし、スクリューピッチを第1の搬送部bのスクリュー羽根部分より小さくして現像材搬送能力を小さくした形態にすることもできる。 Of the second screw member 4 as a carrying member in 2) stirring chamber 17, first and conveying portion b having a large carrying capacity of the developer in the small second transfer portion c of the transport capacity, small second of carrying capability conveying portion of 2 c may not be in the form of a screw blade portion of the return, and in the same direction of the screw vane and the screw vane portion of the first conveying section b, the screw pitch screw blade portion of the first conveying portion b it is also possible to reduce the form of the smaller, the developing material conveying capacity. また搬送部材3・4はスクリュー部材に限られるものではない。 The conveying member 3, 4 is not limited to the screw member.

3)画像形成装置の作像原理・プロセスは実施例の転写タイプの電子写真方式に限られないことは勿論である。 3) imaging principle and process of the image forming apparatus not limited to the electrophotographic method of the transfer type of embodiments is a matter of course. 感光紙を用いた直接タイプの電子写真方式であってもよいし、像担持体として誘電体を用いた転写タイプまたは直接タイプの静電記録方式であってもよい。 May be an electrophotographic system of a direct type using a photosensitive sheet, it may be an electrostatic recording method of the transfer type or direct type using a dielectric as an image carrier.

また、像端時体として電子写真感光体や静電記録誘電体を回動ベルト型にし、これに潜像形成、現像により所要の画像情報のトナー像を形成させ、そのトナー像形成部を閲読表示部に位置させて画像表示させる画像表示装置もある。 Also, an electrophotographic photosensitive member or electrostatic recording dielectric to rotate the belt type as when the image end body, this latent image formation to form a toner image of a desired image information by development, the toner image forming unit reading is positioned on the display unit is also an image display apparatus for displaying images. 本発明の画像形成装置にはこのような画像表示装置も含まれる。 The image forming apparatus of the present invention also includes such an image display device.

以上、本発明の様々な実施例と変形態様例が示され説明されたが、当業者であれば、本発明の趣旨と範囲は本明細書内の特定の説明と図に限定されるのではなく、本願特許請求の範囲に全て述べられた様々の修正と変更に及ぶことが理解されるであろう。 Although variations examples and various embodiments of the present invention have been shown and described, those skilled in the art that the spirit and scope of the present invention to be limited to the specific description and illustration in this specification no, it will be appreciated that cover modifications and all stated various modifications within the scope of the appended claims.

実施例の画像形成装置の概略構成模型図である。 It is a schematic configuration model view of an image forming apparatus according to an embodiment. 図1の現像装置部分の拡大模型図である。 It is an enlarged model view of a developing device portion of FIG. 現像装置の現像容器部分の縦断平面模型図である。 It is a longitudinal schematic plan view of a developer container portion of the developing device. 余剰現像剤の排出説明図である。 A discharge explanatory view of the surplus developer. 実施例1の現像装置の現像剤排出口機能の説明図である。 It is an explanatory view of the developer discharge opening function of the developing apparatus of the first embodiment. 実施例2の現像装置の現像剤排出口機能の説明図である。 It is an explanatory view of the developer discharge opening function of the developing apparatus of the second embodiment. 従来の現像装置の現像剤排出口機能とその問題点の説明図である。 It is an explanatory view of the developer discharge port functions and problems of the conventional developing apparatus. 第2の現像剤搬送部材としてのスクリュー部材の部分的外観斜視図である。 It is a partial perspective view of a screw member as the second developer conveying member. 従来例の現像装置を使用しているカラー複写機の概略構成模型図である。 It is a schematic model view of a color copying machine using the developing device of the conventional example. 従来例の現像装置を使用している現像ロータリー式の現像装置の断面図である。 Is a cross-sectional view of a conventional example in which a developing rotary type developing device using the developing apparatus.

符号の説明 DESCRIPTION OF SYMBOLS

1:現像装置、2:現像容器、T:2成分現像剤、Ta:現像剤面の凸、Tb:現像剤面の平面、3:第1現像剤攪拌搬送スクリュー、4:第2現像剤攪拌搬送スクリュー、c:返しのスクリュー羽根部分、5:現像スリーブ、5a:マグネット、6a:現像剤補給装置、6a:現像剤ボトル、7:現像剤回収口、8:回収容器、9:軸受け、10:弁、11:支点、12:ブレード、13:隔壁、14・15:開口部、16:現像室、17:攪拌室、18:トナー補給口、21:原稿載置台、22:露光光学系、D:感光体、24:帯電器、25:露光装置、26:転写帯電器、27:クリーニング装置、28:タイミングローラ対、29−30:搬送ローラ対、31A・31B:給紙カセット、32A・32B:給紙ローラ、33:定着 1: a developing device, 2: developer container, T: 2-component developer, Ta: convex developer surface, Tb: the plane of the developer surface, 3: first developer stirring and conveying screws, 4: second developer agitating conveying screw, c: screw blade portion of the return, 5: developing sleeve, 5a: magnet, 6a: a developer replenishing device, 6a: developer bottle, 7: developer collecting port, 8: collecting container, 9: bearing, 10 : valve, 11: fulcrum, 12: blade, 13: partition wall, 14, 15: opening, 16: developing chamber, 17: stirring chamber, 18: a toner supply opening, 21: document table, 22: an exposure optical system, D: photoreceptor, 24: charger, 25: exposure apparatus, 26: a transfer charger, 27: cleaning device, 28: a pair of timing rollers, 29-30: conveying roller pair, 31A · 31B: sheet cassette, 32A · 32B: feed roller, 33: fixing 置、54a:回転体 Location, 54a: rotating body

Claims (4)

  1. トナーとキャリアを含んだ現像剤を収容し現像剤の循環経路を構成する現像室と攪拌室とに仕切られた現像容器と、前記現像室内の現像剤を担持して現像部へ搬送する現像剤担持体と、現像剤補給に伴う余剰現像剤を前記攪拌室から排出する排出口と、前記攪拌室内の現像剤を攪拌搬送する搬送部材を備え前記循環経路にて現像剤を循環させる循環手段と、を有する現像装置において、 A developer container which is partitioned into a developing chamber and the stirring chamber accommodates a developer containing a toner and a carrier constituting the circulation path of the developer, the conveys the developing chamber of the developing agent carried to the developing portion developer and bearing member, a discharge port for discharging the excess developer from the stirring chamber accompanying the developer supply, a circulating means for circulating the developer in the circulation path includes a conveying member for conveying stirring the developer in the stirring chamber in the developing device having,
    前記搬送部材は現像剤の搬送能力の大きい第1の搬送部と搬送能力の小さい第2の搬送部を有し、前記排出口を前記第2搬送部に対向して設けたことを特徴とする現像装置。 The conveying member has a smaller second transfer portion having a large first conveying portion and the conveying capacity of the conveying capacity of the developer, characterized in that the outlet is provided to face the second conveying unit the developing device.
  2. 前記第1搬送部は前記攪拌室の循環方向へ現像剤を搬送し、前記第2搬送部は前記攪拌室の循環方向とは逆向きに現像剤を搬送する構成とされ、前記第2の搬送部並びに前記排出口を前記攪拌室から前記現像室への現像剤連通領域内に設けたことを特徴とする請求項1の現像装置。 The first conveyor conveys the developer to the circulation direction of the agitating chamber, the second conveyance unit is configured to convey the developer in the opposite direction to the direction of circulation of the stirring chamber, conveying the second parts and developing apparatus according to claim 1, characterized in that a said outlet to the developer communication area to said developing chamber from the stirring chamber.
  3. 前記搬送部材は前記第1の搬送部よりも前記第2の搬送部のスクリューピッチが小さいスクリュー部材とされることを特徴とする請求項1又は2の現像装置。 The conveying member is a developing apparatus according to claim 1 or 2, characterized in that the screw pitch of the second conveying portion than the first transport portion is small screw member.
  4. 前記現像装置の回転に伴って前記排出口から現像剤が漏れ出すのを防止する開閉弁を有し、前記現像装置が現像位置にあるとき前記開閉弁の開閉支点が上側となるように設けたことを特徴とする請求項1乃至3のいずれかの現像装置。 Has an opening and closing valve to prevent the developer from leaking from the discharge opening with the rotation of the developing device, the opening and closing fulcrum of the on-off valve when said developing device is in the developing position is arranged such that the upper one of the developing apparatus according to claim 1, wherein the.
JP2003330030A 2003-09-22 2003-09-22 Developing device Pending JP2005099134A (en)

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007086311A (en) * 2005-09-21 2007-04-05 Fuji Xerox Co Ltd Developing device
JP2007206587A (en) * 2006-02-06 2007-08-16 Fuji Xerox Co Ltd Developing device
JP2008203814A (en) * 2007-01-26 2008-09-04 Ricoh Co Ltd Developing device and image forming apparatus
JP2009009022A (en) * 2007-06-29 2009-01-15 Ricoh Co Ltd Developing device, image forming apparatus and process cartridge
JP2009047891A (en) * 2007-08-20 2009-03-05 Ricoh Co Ltd Image forming device
JP2009058649A (en) * 2007-08-30 2009-03-19 Ricoh Co Ltd Developing device, process cartridge, and image forming apparatus
JP2009069225A (en) * 2007-09-11 2009-04-02 Ricoh Co Ltd Developing device, process cartridge and image forming apparatus
US7529510B2 (en) 2005-04-26 2009-05-05 Sharp Kabushiki Kaisha Image forming apparatus with developing device having discharge openings
JP2009103805A (en) * 2007-10-22 2009-05-14 Ricoh Co Ltd Image forming apparatus
JP2009116209A (en) * 2007-11-09 2009-05-28 Fuji Xerox Co Ltd Developing device and image forming apparatus equipped therewith
US7715764B2 (en) 2006-11-09 2010-05-11 Sharp Kabushiki Kaisha Developing device with pulsation developer flow and image forming apparatus
JP2010139924A (en) * 2008-12-15 2010-06-24 Konica Minolta Business Technologies Inc Developing device and image forming apparatus
US7801466B2 (en) 2006-05-19 2010-09-21 Ricoh Company, Limited Developing device and image forming apparatus
JP2012047988A (en) * 2010-08-26 2012-03-08 Kyocera Mita Corp Development device and image forming apparatus having the device
US8295737B2 (en) 2007-01-26 2012-10-23 Ricoh Company, Ltd. Developing device and image forming apparatus using same
JP2014052558A (en) * 2012-09-07 2014-03-20 Toshiba Corp Image forming apparatus

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7529510B2 (en) 2005-04-26 2009-05-05 Sharp Kabushiki Kaisha Image forming apparatus with developing device having discharge openings
JP2007086311A (en) * 2005-09-21 2007-04-05 Fuji Xerox Co Ltd Developing device
JP2007206587A (en) * 2006-02-06 2007-08-16 Fuji Xerox Co Ltd Developing device
US7801466B2 (en) 2006-05-19 2010-09-21 Ricoh Company, Limited Developing device and image forming apparatus
US7715764B2 (en) 2006-11-09 2010-05-11 Sharp Kabushiki Kaisha Developing device with pulsation developer flow and image forming apparatus
US8295737B2 (en) 2007-01-26 2012-10-23 Ricoh Company, Ltd. Developing device and image forming apparatus using same
JP2008203814A (en) * 2007-01-26 2008-09-04 Ricoh Co Ltd Developing device and image forming apparatus
JP2009009022A (en) * 2007-06-29 2009-01-15 Ricoh Co Ltd Developing device, image forming apparatus and process cartridge
JP2009047891A (en) * 2007-08-20 2009-03-05 Ricoh Co Ltd Image forming device
JP2009058649A (en) * 2007-08-30 2009-03-19 Ricoh Co Ltd Developing device, process cartridge, and image forming apparatus
JP2009069225A (en) * 2007-09-11 2009-04-02 Ricoh Co Ltd Developing device, process cartridge and image forming apparatus
JP2009103805A (en) * 2007-10-22 2009-05-14 Ricoh Co Ltd Image forming apparatus
JP2009116209A (en) * 2007-11-09 2009-05-28 Fuji Xerox Co Ltd Developing device and image forming apparatus equipped therewith
JP2010139924A (en) * 2008-12-15 2010-06-24 Konica Minolta Business Technologies Inc Developing device and image forming apparatus
JP2012047988A (en) * 2010-08-26 2012-03-08 Kyocera Mita Corp Development device and image forming apparatus having the device
JP2014052558A (en) * 2012-09-07 2014-03-20 Toshiba Corp Image forming apparatus

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