JP2005308907A - Developing device and image forming apparatus having the same - Google Patents

Developing device and image forming apparatus having the same Download PDF

Info

Publication number
JP2005308907A
JP2005308907A JP2004123457A JP2004123457A JP2005308907A JP 2005308907 A JP2005308907 A JP 2005308907A JP 2004123457 A JP2004123457 A JP 2004123457A JP 2004123457 A JP2004123457 A JP 2004123457A JP 2005308907 A JP2005308907 A JP 2005308907A
Authority
JP
Japan
Prior art keywords
toner
developing
forming apparatus
supply roller
image forming
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2004123457A
Other languages
Japanese (ja)
Other versions
JP4467049B2 (en
Inventor
Minoru Wada
実 和田
Eiji Gyotoku
栄二 行徳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyocera Document Solutions Inc
Original Assignee
Kyocera Mita Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyocera Mita Corp filed Critical Kyocera Mita Corp
Priority to JP2004123457A priority Critical patent/JP4467049B2/en
Publication of JP2005308907A publication Critical patent/JP2005308907A/en
Application granted granted Critical
Publication of JP4467049B2 publication Critical patent/JP4467049B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Landscapes

  • Dry Development In Electrophotography (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus with a developing device with which degradation in image quality is prevented by preventing excessive supply of toner or failure in supply of toner by simple means, the developing device being divided in two chambers, a developing section and a toner storage section, and designed so as to additionally supply toner from an opening between the toner storage section and the developing section. <P>SOLUTION: The developing device comprises the developing section and the toner storage section for supplying toner to the developing section. The developing device has, in a toner supply opening located in the position of contact between the toner storage section and the developing section, a check valve for opening only to the developing section. The developing device includes a means for providing a toner storage part in the direction of opening at the free end of the check valve. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、電子写真方式を利用した複写機、プリンタ、ファクシミリ、それらの複合機などの画像形成装置に用いられる現像装置と該現像装置を有する画像形成装置に係り、特に、1成分現像剤を使用し、現像ローラや供給ローラを配した現像部と、該現像部にトナーを供給するトナー収納部との間に仕切が設けられている現像装置と、該現像装置を有する画像形成装置に関するものである。   BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device used in an image forming apparatus such as a copying machine, a printer, a facsimile, or a composite machine using an electrophotographic method, and an image forming apparatus having the developing device. The present invention relates to a developing device in which a partition is provided between a developing unit that uses a developing roller and a supply roller and a toner storage unit that supplies toner to the developing unit, and an image forming apparatus having the developing device It is.

電子写真方式を利用した複写機、プリンタ、ファクシミリ、それらの複合機などの画像形成装置において使用される現像装置は、現像剤にトナーとキャリアとを使用した2成分現像方式、キャリアを使用せずにトナーのみを使用した1成分現像方式のものが知られている。   A developing device used in an image forming apparatus such as a copying machine, a printer, a facsimile, or a composite machine using an electrophotographic method does not use a two-component developing method in which a toner and a carrier are used as a developer. A one-component developing system using only toner is known.

1成分現像方式の現像装置においては、装置本体内に収容されたトナーを供給ローラにより現像ローラ表面に送り込み、この現像ローラに規制部材を圧接させてトナー量を規制すると共に摩擦帯電させ、現像ローラを回転させてトナーを像担持体と対面する現像領域に導いて像担持体上に形成された静電潜像を現像し、現像ローラ表面に残ったトナーは供給ローラによって現像ローラ表面から離脱させると共に新たなトナーを現像ローラに供給するようにしており、低コストな現像装置を提供するには有利なシステムである。   In a one-component developing type developing device, toner contained in the main body of the device is fed to the surface of the developing roller by a supply roller, and a regulating member is pressed against the developing roller to regulate the amount of toner and frictionally charge the developing roller. To rotate the toner to the developing area facing the image carrier to develop the electrostatic latent image formed on the image carrier, and the toner remaining on the surface of the developing roller is separated from the surface of the developing roller by the supply roller. At the same time, new toner is supplied to the developing roller, which is an advantageous system for providing a low-cost developing device.

しかしながら、現像ローラ表面に規制部材を圧接させて現像ローラによって搬送されるトナー量を規制するようにした場合、粒径の大きなトナーが現像ローラから離脱されて粒径の小さなトナーが先に現像に使用されるようになり、また現像後の現像ローラ上に残っているトナーを離脱させる場合においても、粒径の大きなトナーが現像ローラから離脱されるようになり、次第に現像装置内に粒径の大きなトナーの割合が増加し、形成される画像の画質が低下するという問題があった。   However, when the regulating member is pressed against the surface of the developing roller to regulate the amount of toner conveyed by the developing roller, the toner having a large particle size is separated from the developing roller and the toner having the small particle size is first developed. Even when the toner remaining on the developing roller after development is released, the toner having a large particle size is released from the developing roller, and the particle size gradually increases in the developing device. There is a problem that the ratio of large toner increases and the image quality of the formed image decreases.

そのため、現像装置における供給ローラや現像ローラを配した現像部とトナー収納部との間に仕切を設けて分離したり、現像部とトナーを収容したトナーコンテナを分離し、仕切や現像部とトナーコンテナとが接する位置に開口部を設け、現像ローラから離脱したトナーがトナー収納部やトナーコンテナに戻らないようにした現像装置が用いられている。   Therefore, a partition is provided between the developing unit provided with the supply roller or the developing roller in the developing device and the toner storage unit, or the developing unit and the toner container storing the toner are separated, and the partition, the developing unit, and the toner are separated. A developing device is used in which an opening is provided at a position in contact with the container so that the toner separated from the developing roller does not return to the toner container or the toner container.

一方、カラー画像形成装置においては、このような1成分現像剤を用いたカラー画像形成装置で使用する色数分の現像装置を回転可能に構成した円筒状のロータリー型ラックに支持させ、それぞれの色に対応した現像部の現像ローラを、像担持体に順次対面させるようにしたロータリー型の現像装置が用いられるようになっている。   On the other hand, in a color image forming apparatus, a developing device for the number of colors used in such a color image forming apparatus using a one-component developer is supported by a cylindrical rotary rack configured to be rotatable, and A rotary type developing device is used in which the developing roller of the developing unit corresponding to the color sequentially faces the image carrier.

しかしながら、ロータリー型現像装置においては、せっかく仕切を設けたり現像部とトナーコンテナを分離しても、ロータリーラックが回転することによって現像部とトナー収納部の上下関係が変化してトナー供給過剰が起き、カブリが発生したり、現像部の粒径の大きなトナーがトナー収納部やトナーコンテナに戻されてしまい、仕切り部材を設けたり現像部とトナーコンテナを分離した効果がなくなって、粒径の小さなトナーだけが先に現像に使用されて粒径の大きなトナーが残り、次第に形成される画像の画質が低下するという問題が依然として存在した。   However, in a rotary developing device, even if a partition is provided or the developing unit and the toner container are separated, the rotary rack rotates to change the vertical relationship between the developing unit and the toner storage unit, resulting in excessive toner supply. , Fogging occurs, toner having a large particle size in the developing unit is returned to the toner storage unit or toner container, and the effect of separating the developing unit and the toner container is lost, resulting in a small particle size. There remains a problem that only the toner is used for the development first, and the toner having a large particle size remains, and the image quality of the formed image gradually deteriorates.

さらに現像時に、何らかの理由でトナー収納部やトナーコンテナから現像部内に新トナーが入ることで粉圧が大きく変わると、既に帯電したトナーと新しいトナーが混ざり、荷電不良が生じて画質が低下するという問題も生じる。   Furthermore, during development, if for some reason new toner enters the developing unit from the toner storage unit or toner container and the powder pressure changes significantly, the already charged toner and new toner are mixed, resulting in poor charging and image quality degradation. Problems also arise.

こういった問題に対処するため特許文献1には、図4に示したように、現像装置を現像部50とトナー収納部51の2室に分割し、現像ローラ52、この現像ローラ52にトナーを供給する供給ローラ53、層厚規制部材54、シール部材55などを有する現像部50に、撹拌部材56によって収容したトナーを撹拌するようにしたトナー収納部51からトナーを追加補給しながら、現像部50内のトナーの粒径を一定に保って多数枚印字後における画質低下を防ぐため、トナー収納部51と現像部50を隔てる壁に開口57を設け、その開口57に逆流防止弁58を設けることで、現像部50からトナー収納部51へのトナーの逆流を防止して粒径選別による画質低下を防止し、また、現像部50にトナーが過充填されて滞留し、現像装置のトルク上昇や規制部材54との荷電不良を引き起こさないよう、逆流防止弁58の自由端の現像部50側に突起59を設け、供給ローラ53で運ばれるトナーの粉圧によって現像部50にトナーが過充填されるのを防止するようにした現像装置が示されている。   In order to deal with these problems, Patent Document 1 discloses that the developing device is divided into two chambers, a developing unit 50 and a toner storage unit 51, as shown in FIG. The developing unit 50 having a supply roller 53, a layer thickness regulating member 54, a seal member 55, and the like is supplied while toner is additionally supplied from the toner storage unit 51 that stirs the toner stored by the stirring member 56. In order to keep the particle size of the toner in the unit 50 constant and prevent image quality deterioration after printing a large number of sheets, an opening 57 is provided in a wall separating the toner storage unit 51 and the developing unit 50, and a backflow prevention valve 58 is provided in the opening 57. Accordingly, the backflow of the toner from the developing unit 50 to the toner storage unit 51 is prevented to prevent the image quality from being deteriorated due to the particle size selection, and the developing unit 50 is overfilled with toner and stays there. A protrusion 59 is provided on the developing unit 50 side of the free end of the backflow prevention valve 58 so as not to cause an increase in torque or a charging failure with the regulating member 54, and toner is applied to the developing unit 50 by the powder pressure of the toner carried by the supply roller 53. A developing device is shown which prevents overfilling.

特開2003−255687JP2003-255687

しかしながら、この特許文献1に示された現像装置は、逆流防止弁58を通過して追加補給されたトナーが直接供給ローラ53を経由して現像ローラ52に送られてしまうため、逆流防止弁58を通過する追加トナー量が多いときには画像上にカブリの問題が発生しやすく、また、可動部材である逆流防止弁58に突起59をつけているため、供給ローラ53と突起59のクリアランス設定に余裕があまりなく、設定のバラツキによっては、逆流防止弁の可動が制限されてトナー供給不良などを起こすなどの問題があった。   However, in the developing device disclosed in Patent Document 1, since the additionally supplied toner passing through the backflow prevention valve 58 is directly sent to the development roller 52 via the supply roller 53, the backflow prevention valve 58 is provided. When the amount of additional toner passing through the toner is large, a problem of fogging is likely to occur on the image, and since the protrusion 59 is provided on the backflow prevention valve 58 which is a movable member, there is a margin in setting the clearance between the supply roller 53 and the protrusion 59. However, depending on the setting variation, there is a problem that the backflow prevention valve is limited in its movement and causes toner supply failure.

そのため本発明においては、現像装置を現像部とトナー収納部の2室に分割し、トナー収納部と現像部の間に設けた開口部からトナーを追加補給できるようにした現像装置において、簡易な手段でトナーの供給過剰や供給不良を起こさないようにし、画質低下を防止した画像形成装置における現像装置を提供することが課題である。   Therefore, in the present invention, the developing device is divided into the two chambers of the developing portion and the toner storage portion, and the developing device in which the toner can be additionally supplied from the opening provided between the toner storage portion and the developing portion is simplified. It is an object of the present invention to provide a developing device in an image forming apparatus that prevents the toner from being excessively supplied or poorly supplied and prevents deterioration in image quality.

潜像を担持する像担持体と相対して該像担持体上の潜像を現像する現像ローラと、該現像ローラにトナーを供給する供給ローラとを内蔵する現像部と、該現像部にトナーを供給するトナー収納部とからなり、該トナー収納部と前記現像部が接する位置に設けたトナー供給用開口に、前記現像部内に開口可能な逆流防止弁を有する画像形成装置における現像装置において、
前記逆流防止弁が開口する方向の現像部内に、トナーの貯留部を設ける手段が存在することを特徴とする。
また、この現像装置を用いた画像形成装置は、
潜像を担持する像担持体と、該像担持体上の潜像を現像する現像ローラ及び該現像ローラへトナーを運ぶ供給ローラとを有して回転可能に構成した円筒状のロータリー型ラックに固定され、該ロータリー型ラックの回転により、前記現像ローラが順次前記像担持体に対面する位置に運ばれる複数の現像部と、該各現像部に隣接されて前記ロータリー型ラックまたは前記現像部に着脱可能に支持されたトナー収納部とからなり、該トナー収納部と前記現像部が接する位置に設けたトナー供給用開口に、前記現像部内に開口可能な逆流防止弁を設けた現像装置を有する画像形成装置において、
前記逆流防止弁が開口する方向の現像部内に、トナーの貯留部を設ける手段が存在することを特徴とする。
A developing portion that includes a developing roller that develops the latent image on the image bearing member relative to the image bearing member that carries the latent image, a supply roller that supplies toner to the developing roller, and a toner in the developing portion In the developing device in the image forming apparatus, the toner containing portion is configured to have a backflow prevention valve that can be opened in the developing portion at a toner supply opening provided at a position where the toner containing portion and the developing portion are in contact with each other.
A means for providing a toner reservoir is present in the developing portion in the direction in which the backflow prevention valve opens.
In addition, an image forming apparatus using this developing device is
A cylindrical rotary rack having an image carrier that carries a latent image, a developing roller that develops the latent image on the image carrier, and a supply roller that carries toner to the developing roller, and is configured to be rotatable. A plurality of developing units that are fixedly moved to a position where the developing roller sequentially faces the image carrier by rotation of the rotary rack, and adjacent to each developing unit, the rotary rack or the developing unit. And a developing device provided with a toner supply opening provided at a position where the toner storage portion and the developing portion are in contact with each other, and a backflow prevention valve that can be opened in the developing portion. In the image forming apparatus,
A means for providing a toner reservoir is present in the developing portion in the direction in which the backflow prevention valve opens.

そして前記トナー貯留部を、前記逆流防止弁の供給ローラ回転方向下流側の空間としたことを特徴とする。   The toner storage portion is a space downstream of the check valve in the rotation direction of the supply roller.

また前記トナー貯留部は、前記供給ローラ回転方向下流側が徐々に縮小されている空間であることを特徴とする。   Further, the toner storage portion is a space that is gradually reduced on the downstream side in the rotation direction of the supply roller.

さらに、前記トナー貯留部を設ける手段は、前記逆流防止弁の供給ローラ回転方向下流側の現像部壁に前記供給ローラと僅少な間隔を有して設けられた規制部材であることを特徴とする。   Further, the means for providing the toner storage portion is a regulating member provided on the developing portion wall on the downstream side in the rotation direction of the supply roller of the backflow prevention valve with a slight gap from the supply roller. .

そして、前記トナー貯留部を設ける手段は、前記逆流防止弁の供給ローラ回転方向下流側の現像部壁に前記供給ローラと接して設けられた可撓性部材であることを特徴とする。   The means for providing the toner reservoir is a flexible member provided in contact with the supply roller on the developing unit wall on the downstream side in the rotation direction of the supply roller of the backflow prevention valve.

また、前記トナー収納部と現像部における開口は、前記トナー収納部を着脱可能に構成した場合に取り外し方向へ広がる傾斜を有して設けられていることを特徴とする。   Further, the openings in the toner storage portion and the developing portion are provided with an inclination that widens in the removal direction when the toner storage portion is configured to be detachable.

このように、現像部と該現像部にトナーを供給するトナー収納部とからなり、トナー収納部と現像部が接する位置に設けたトナー供給用開口に、現像部内に開口可能な逆流防止弁を有する現像装置において、前記逆流防止弁が開口する方向の現像部内に、トナーの貯留部を設ける手段が存在することにより、現像部側にトナーが多く存在する場合はこのトナー貯留部に多くのトナーが溜まり、逆流防止弁はこのトナーの溜まりに邪魔されて大きく開口することが無く、従ってトナーの供給過剰が防止できる。逆に、現像部側にトナーが少なくなったときはこのトナー貯留部にトナーが溜まることがなく、逆流防止弁は大きく開けるからトナーが充分供給され、従ってトナーの供給過剰によるカブリや、供給不足による画質不良などの事故を起こすことのない現像装置と画像形成装置を提供することができる。   As described above, the developing unit and the toner storage unit that supplies toner to the development unit are provided with a backflow prevention valve that can be opened in the developing unit at the toner supply opening provided at a position where the toner storage unit and the development unit are in contact with each other. In the developing device, since there is a means for providing a toner storing portion in the developing portion in the direction in which the backflow prevention valve opens, when a large amount of toner is present on the developing portion side, a large amount of toner is stored in the toner storing portion. The backflow prevention valve is not obstructed by the toner accumulation and does not open greatly, and therefore, excessive supply of toner can be prevented. On the contrary, when the toner is low on the developing unit side, the toner does not collect in the toner storage unit, and the backflow prevention valve is opened wide so that the toner is sufficiently supplied. Therefore, fog due to excessive supply of toner or insufficient supply It is possible to provide a developing device and an image forming apparatus that do not cause an accident such as poor image quality due to the above.

そして前記トナー貯留部を、前記逆流防止弁の供給ローラ回転方向下流側の空間としたことにより、トナー貯留部のトナーは、供給ローラによって重力に逆らって機械的、電気的な力で運ばれているから、トナー貯留部の下に空間がある場合、すなわち現像部のトナーが少なくなったときはこの機械的、電気的な力が無くなればトナーは落下し、貯留ができなくなるから、現像部におけるトナー量に従って供給されるトナー量が調節できることになる。   The toner storage portion is a space downstream of the backflow prevention valve in the rotation direction of the supply roller, so that the toner in the toner storage portion is conveyed by mechanical and electrical force against the gravity by the supply roller. Therefore, when there is a space under the toner storage part, that is, when the toner in the developing part is low, if this mechanical and electrical force is lost, the toner falls and cannot be stored. The amount of toner supplied can be adjusted according to the amount of toner.

また前記トナー貯留部は、前記供給ローラ回転方向下流側が徐々に縮小されている空間とすることで、現像部におけるトナー量を敏感に反映する貯留部とすることができ、供給されるトナー量を正確に制御することができる。   In addition, the toner storage portion can be a storage portion that sensitively reflects the toner amount in the developing portion by making the space downstream in the rotation direction of the supply roller gradually reduced. It can be controlled accurately.

さらに、前記トナー貯留部を設ける手段は、前記逆流防止弁の供給ローラ回転方向下流側の現像部壁に前記供給ローラと僅少な間隔を有して設けられた規制部材としたり、前記逆流防止弁の供給ローラ回転方向下流側の現像部壁に前記供給ローラと接して設けられた可撓性部材とすることにより、供給されたトナーの通過量がこれら規制部材や可撓性部材で制限されて現像ローラに向かうから、供給過剰でカブリが生じるといった事故を防止できる。   Further, the means for providing the toner storage portion may be a regulating member provided on the developing portion wall on the downstream side in the rotation direction of the supply roller of the backflow prevention valve with a slight gap from the supply roller, or the backflow prevention valve By using a flexible member provided in contact with the supply roller on the developing unit wall on the downstream side in the rotation direction of the supply roller, the amount of toner that is supplied is limited by the restriction member and the flexible member. Since it goes to the developing roller, it is possible to prevent an accident such as fogging due to excessive supply.

また、前記トナー収納部と現像部における開口は、前記トナー収納部を着脱可能に構成した場合に取り外し方向へ広がる傾斜を有して設けられていることで、逆流防止弁の自由端がより供給ローラに近づくことになり、より正確に供給トナー量を調節することができると共に、トナー収納部を着脱できるようにした場合に着脱が容易に、確実におこなえるようになる。   Further, the opening in the toner storage portion and the developing portion is provided with an inclination that widens in the removal direction when the toner storage portion is configured to be detachable, so that the free end of the backflow prevention valve is supplied more. As the toner approaches the roller, the amount of supplied toner can be adjusted more accurately, and when the toner storage portion can be attached and detached, the attachment and detachment can be performed easily and reliably.

以下、図面を参照して本発明の好適な実施例を例示的に詳しく説明する。但しこの実施例に記載されている構成部品の寸法、材質、形状、その相対的配置等は特に特定的な記載がない限りは、この発明の範囲をそれに限定する趣旨ではなく、単なる説明例に過ぎない。   Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative examples. Not too much.

図1は本発明になる現像装置の実施例1の構成概略を示した図、図2は同じく本発明になる現像装置の実施例2の構成概略を示した図、図3は本発明になる現像装置を用いた画像形成装置の一例として、現像装置をロータリー型とした画像形成装置の構成概略を示した断面図である。   FIG. 1 is a diagram showing a schematic configuration of Embodiment 1 of the developing device according to the present invention, FIG. 2 is a diagram showing a schematic configuration of Embodiment 2 of the developing device according to the present invention, and FIG. 3 is the present invention. FIG. 1 is a cross-sectional view illustrating a schematic configuration of an image forming apparatus in which a developing device is a rotary type, as an example of an image forming apparatus using a developing device.

図中同一構成要素には同一番号が付してあり、1は本発明になる現像装置を用いた画像形成装置の一例として、現像装置をロータリー型の現像装置2に組み込んだ画像形成装置、2はカラー画像形成に使用する例えばブラック(B)3、マゼンタ(M)3、シアン(C)3、イエロー(Y)3のトナー収納部3と、それぞれのトナー収納部3に対応してブラック(B)4、マゼンタ(M)4、シアン(C)4、イエロー(Y)4の現像部4とが設けられたロータリー型現像装置で、このロータリー型現像装置2は、それぞれの色の現像部4を、順次感光体(像担持体)5に対向した現像位置となるよう回転させて、感光体(像担持体)5上の潜像を現像する。6は帯電装置、7は例えばレーザなどを用いた露光装置、8はクリーニング装置、9は中間転写ベルト、10は一次転写ローラ、11は二次転写ローラ、12は記録媒体搬送路、13は定着装置、14は排出部、15は中間転写ベルト9のクリーニング装置、16は記録媒体、30はトナー収納部側開口、31はこのトナー収納部側開口30に設けた逆流防止弁、32はトナー収納部3内のトナーを撹拌する撹拌部材、33は逆流防止弁31を取り付けるために開口部30に設けたリブ、40は現像部4を構成してトナーを担持する現像ローラ、41は現像ローラ40にトナーを供給するウレタンスポンジなどで構成した供給ローラ、42は現像ローラ40上のトナー層厚を規制すると共にトナーを帯電させる規制ブレード、43はシール部材44を現像ローラ40側に押しつけるための押圧部材でウレタンスポンジなどを用いる。45は逆流防止弁31から現像部4に供給されるトナーが過剰とならないよう、現像部4における逆流防止弁31の自由端側で、供給ローラ41における現像ローラ40の回転方向下流側に設けられたトナー規制部材、46は同じく現像部4における逆流防止弁31の自由端側で、供給ローラ41における現像ローラ40の下流側に設けられた金属箔などで構成されたトナー規制部材、47はトナー収容室3におけるリブ33に対応して設けられた突出部、48はトナー貯留部である。 In the drawings, the same components are denoted by the same reference numerals. Reference numeral 1 denotes an image forming apparatus in which a developing device is incorporated in a rotary developing device 2 as an example of an image forming apparatus using the developing device according to the present invention. Corresponds to, for example, black (B) 3 1 , magenta (M) 3 2 , cyan (C) 3 3 , yellow (Y) 3 4 toner storage units 3 used for color image formation, and the respective toner storage units 3 The rotary developing device 2 is provided with a developing unit 4 of black (B) 4 1 , magenta (M) 4 2 , cyan (C) 4 3 , and yellow (Y) 4 4. Develops the latent image on the photoconductor (image carrier) 5 by sequentially rotating the developing sections 4 of the respective colors so as to be at the development positions facing the photoconductor (image carrier) 5. 6 is a charging device, 7 is an exposure device using a laser, for example, 8 is a cleaning device, 9 is an intermediate transfer belt, 10 is a primary transfer roller, 11 is a secondary transfer roller, 12 is a recording medium conveyance path, and 13 is fixing. 14 is a discharge unit, 15 is a cleaning device for the intermediate transfer belt 9, 16 is a recording medium, 30 is a toner storage unit side opening, 31 is a backflow prevention valve provided in the toner storage unit side opening 30, and 32 is a toner storage unit. An agitating member for agitating the toner in the unit 3, 33 is a rib provided in the opening 30 for attaching the backflow prevention valve 31, 40 is a developing roller that constitutes the developing unit 4 and carries the toner, and 41 is a developing roller 40. A supply roller made of urethane sponge or the like for supplying toner to the toner, 42 is a regulating blade for regulating the toner layer thickness on the developing roller 40 and charging the toner, and 43 is a seal portion 44 using a urethane sponge pressing member for pressing the developing roller 40 side. 45 is provided on the free end side of the backflow prevention valve 31 in the developing unit 4 on the downstream side in the rotation direction of the developing roller 40 in the supply roller 41 so that the toner supplied from the backflow prevention valve 31 to the developing unit 4 does not become excessive. Similarly, the toner regulating member 46 is a free end side of the backflow prevention valve 31 in the developing unit 4, and is a toner regulating member made of metal foil or the like provided on the downstream side of the developing roller 40 in the supply roller 41. A protrusion 48 provided corresponding to the rib 33 in the storage chamber 3 is a toner reservoir.

最初に図3を用い、本発明になる現像装置を組み込んだロータリー型現像装置2を有する画像形成装置1について簡単に説明する。なお、以下の説明では、本発明の現像装置をロータリー型現像装置2に組み込んだ場合を例に説明するが、本発明はこういったロータリー型現像装置に組み込んだ場合だけでなく、単色の画像形成装置に用いる単一の現像装置としても適用できることはあきらかである。   First, an image forming apparatus 1 having a rotary type developing device 2 incorporating a developing device according to the present invention will be briefly described with reference to FIG. In the following description, a case where the developing device of the present invention is incorporated in the rotary type developing device 2 will be described as an example. However, the present invention is not limited to such a case where the developing device is incorporated in such a rotary type developing device. Obviously, it can also be applied as a single developing device used in the forming apparatus.

この図3に示した画像形成装置におけるロータリー型現像装置2は、図1または図2に示した実施例1、実施例2のような現像装置における現像部4とトナー収納部3とを、円筒状のラックに例えばブラック(B)4、マゼンタ(M)4、シアン(C)4、イエロー(Y)4の現像部4として固定し、その各現像部4、4、4、4に隣接させて、ブラック(B)3、マゼンタ(M)3、シアン(C)3、イエロー(Y)3のトナー収納部3が、円筒状ラックまたは各現像部4、4、4、4に、図示していない位置決め部材および結合部材によって着脱可能に支持されている。なお、トナー収納部3は、トナーコンテナとして交換可能に構成しても、固定式として別途トナーをトナー収納部3に供給するように構成してもどちらでも良い。 The rotary type developing device 2 in the image forming apparatus shown in FIG. 3 includes a developing portion 4 and a toner storage portion 3 in the developing device as in the first and second embodiments shown in FIG. For example, black (B) 4 1 , magenta (M) 4 2 , cyan (C) 4 3 , yellow (Y) 4 4 are fixed as developing sections 4, and the developing sections 4 1 , 4 2 , Adjacent to 4 3 , 4 4 , black (B) 3 1 , magenta (M) 3 2 , cyan (C) 3 3 , yellow (Y) 3 4 toner storage unit 3 is formed in a cylindrical rack or each developing unit. The parts 4 1 , 4 2 , 4 3 , 4 4 are detachably supported by positioning members and coupling members (not shown). The toner storage unit 3 may be configured to be replaceable as a toner container, or may be configured to separately supply toner to the toner storage unit 3 as a fixed type.

そして待機状態においては、ロータリー型現像装置2における例えばブラック(B)用現像部4が感光体(像担持体)5に対向した現像位置となるようにされている。そして、図示していない制御装置に画像データが送られてくると、その画像データはブラック(B)、マゼンタ(M)、シアン(C)、イエロー(Y)の各色のデータに分解され、一方感光体(像担持体)5が帯電装置6で均一に帯電される。 And in the standby state are adapted for example black in the rotary type developing device 2 (B) developing unit 4 1 is the developing position facing the photosensitive member (image bearing member) 5. When image data is sent to a control device (not shown), the image data is decomposed into data of each color of black (B), magenta (M), cyan (C), and yellow (Y). The photoreceptor (image carrier) 5 is uniformly charged by the charging device 6.

そして最初にブラック(B)のデータが露光装置7に与えられて感光体(像担持体)5が露光され、潜像が形成されるとそれが現像部4で現像されてトナー画像となり、そのトナー画像が一次転写バイアスを与えられた一次転写ローラ10によって中間転写ベルト9に転写される。トナー画像が中間転写ベルト9に転写された後に感光体(像担持体)5に残った残トナーは、クリーニング装置8でクリーニングされ、次の画像形成が行われる。なお、中間転写ベルト9に接する二次転写ローラ11とクリーニング装置15は、全ての色のトナー画像が中間転写ベルト9に重ね合わせて転写されるまで、この中間転写ベルト9から離間させられている。 The first black (B) data is exposed photosensitive member (image bearing member) 5 is given to the exposure device 7, when the latent image is formed it becomes is developed by the developing unit 4 first toner image, The toner image is transferred to the intermediate transfer belt 9 by the primary transfer roller 10 given a primary transfer bias. The residual toner remaining on the photosensitive member (image carrier) 5 after the toner image is transferred to the intermediate transfer belt 9 is cleaned by the cleaning device 8, and the next image formation is performed. The secondary transfer roller 11 and the cleaning device 15 that are in contact with the intermediate transfer belt 9 are separated from the intermediate transfer belt 9 until the toner images of all colors are transferred onto the intermediate transfer belt 9 in an overlapping manner. .

こうしてブラック(B)のトナー画像の形成が済むとロータリー型現像装置2が回転し、次のマゼンタ(M)の現像部4が感光体(像担持体)5に対向した現像位置とされ、先に分解されたマゼンタ(M)の画像データが露光装置7に与えられて露光が行われる。そして感光体(像担持体)5上に潜像が形成されてそれが現像部4で現像されてトナー画像となり、中間転写ベルト9上に転写されているブラック(B)のトナー画像の上に重ね合わせて転写される。 Thus After completion of the formation of the toner image of black (B) to rotate the rotary type developing device 2, a developing section 4 2 of next magenta (M) is a developing position facing the photosensitive member (image bearing member) 5, The previously decomposed magenta (M) image data is given to the exposure device 7 for exposure. And it latent image is formed on 5 the photosensitive member (image bearing member) is developed by the developing unit 4 2 becomes a toner image, on the black toner image being transferred onto the intermediate transfer belt 9 (B) Are superimposed and transferred.

そして同様の動作がシアン(C)、イエロー(Y)の画像データで繰り返され、全ての色のトナー画像が中間転写ベルト9に転写されてフルカラートナー画像とされると、先に中間転写ベルト9から離間されていた2次転写ローラ11とクリーニング装置15が中間転写ベルト9に接触させられ、記録媒体16が記録媒体搬送路12を通って二次転写ローラ11の位置する二次転写位置に送り込まれて、フルカラートナー画像が記録媒体16に転写される。   The same operation is repeated with cyan (C) and yellow (Y) image data, and when all color toner images are transferred to the intermediate transfer belt 9 to form a full-color toner image, the intermediate transfer belt 9 first. The secondary transfer roller 11 and the cleaning device 15 that are separated from each other are brought into contact with the intermediate transfer belt 9, and the recording medium 16 is sent through the recording medium conveyance path 12 to the secondary transfer position where the secondary transfer roller 11 is positioned. Thus, the full color toner image is transferred to the recording medium 16.

こうしてフルカラートナー画像が転写された記録媒体16は、さらに定着装置13に送られて熱と圧力で定着され、排出部14に排出される。そして中間転写ベルト9上に残った残トナーは、クリーニング装置15によってクリーニングされ、次の画像形成に備えられる。   The recording medium 16 onto which the full color toner image has been transferred in this manner is further sent to the fixing device 13 where it is fixed by heat and pressure, and is discharged to the discharge unit 14. The residual toner remaining on the intermediate transfer belt 9 is cleaned by the cleaning device 15 and prepared for the next image formation.

本発明になる現像装置は、図1に実施例1の構成概略を示したように、現像部4には一例として、JIS−A硬度45度、抵抗値を1E+6Ω、表面粗さRa(算術平均高さ JIS B 0601−2001)1.0μmの弾性ローラで構成された現像ローラ40、抵抗値1E+8Ωのウレタンスポンジローラなどを用いて現像ローラ40との接触ニツプが3mmになるようにし、1成分トナーを現像ローラ40に供給する供給ローラ41、0.1mm程度のSUS箔を規制圧25N/m程度に設定して現像ローラ40上のトナー層厚を規制すると共にトナーを荷電させる金属製の規制ブレード42、トナーが外部に漏れないように、例えば導電性の高分子量PEフィルムを用いて均一に現像ローラ40に接触するようウレタンスポンジなどの押圧部材43でバックアップし、現像ローラ40に圧接されているシール部材44などを有し、規制ブレード42によって現像ローラ40上のトナー量が所定量に均され、感光体(像担持体)5に近接する位置で、バイアス電位により潜像にトナーを付着させるようになっている。なお、ここに示したそれぞれの部材についての数値は全て一例であり、本発明は、この数値に限定されないことは明かであり、またそれぞれの部材の材料も、ここに示したものだけに限定されないことはあきらかである。   The developing device according to the present invention has an JIS-A hardness of 45 degrees, a resistance value of 1E + 6Ω, a surface roughness Ra (arithmetic average), as shown in FIG. Height JIS B 0601-2001) Using a developing roller 40 composed of a 1.0 μm elastic roller, a urethane sponge roller having a resistance value of 1E + 8Ω, and the like so that the contact nip with the developing roller 40 is 3 mm, and one-component toner A supply roller 41 for supplying the toner to the developing roller 40, a SUS foil of about 0.1 mm is set to a regulation pressure of about 25 N / m to regulate the toner layer thickness on the developing roller 40 and charge the toner. 42. To prevent toner from leaking to the outside, for example, a conductive high molecular weight PE film is used to uniformly contact the developing roller 40 such as a urethane sponge. It has a seal member 44 that is backed up by the pressure member 43 and pressed against the developing roller 40, and the amount of toner on the developing roller 40 is equalized to a predetermined amount by the regulating blade 42. The toner is attached to the latent image by a bias potential at a position adjacent to the latent image. The numerical values for the respective members shown here are all examples, and it is clear that the present invention is not limited to these numerical values, and the materials of the respective members are not limited to those shown here. That is clear.

また、この現像部4のトナー収納部3との隔壁には、トナーをトナー収納部3から現像部4へ移動させるための開口が、供給ローラ41における回転方向下流側に行くに従って供給ローラ41に近接するような傾斜で設けられている。さらに供給ローラ41における現像ローラ40から見て回転方向下流側となる隔壁には、供給ローラ41側に突き出し、供給ローラ41とのギャップが0.3mm程度としたトナー規制部材45が設けられて、供給ローラ41の回転方向下流側が徐々に縮小される空間を形成するようなトナー貯留部48が形成されている。また隔壁における開口の下側は、トナー収納部3を着脱するときの位置決め部となる突出部47が斜めに設けられている。   Further, an opening for moving the toner from the toner storage unit 3 to the development unit 4 is provided in the partition wall of the development unit 4 with the toner storage unit 3 toward the supply roller 41 as it goes downstream in the rotation direction of the supply roller 41. It is provided with an inclination so as to be close to each other. Further, a toner regulating member 45 that protrudes toward the supply roller 41 and has a gap of about 0.3 mm with respect to the supply roller 41 is provided on the partition wall of the supply roller 41 that is on the downstream side in the rotation direction when viewed from the developing roller 40. A toner storage portion 48 is formed so as to form a space in which the downstream side in the rotation direction of the supply roller 41 is gradually reduced. Further, below the opening in the partition wall, a projecting portion 47 serving as a positioning portion when the toner storage portion 3 is attached and detached is provided obliquely.

トナー収納部3には、回転軸にPETフィルムなどを貼り付けた撹拌部材32、現像部4との隔壁に現像部4側の開口に対応した傾斜とした開口30、トナー収納部3におけるこの開口30の外壁側に下側をリブ33に固定し、供給ローラ41側を自由端とした、例えば50μmのPETフィルムを使用した逆流防止弁31とが設けられている。このリブ33は、固定した逆流防止弁31と撹拌部材32が直接当たらないようにするためと、逆流防止弁31を供給ローラ側に近づけるため、及び現像部4とは別体となるトナー収納部3を着脱する際に着脱し易くするため、前記した現像部における開口30の傾斜と同じ傾斜、すなわちトナー収納部3を着脱可能に構成した場合に取り外し方向へ広がる傾斜を有して設けられている。   The toner storage unit 3 includes a stirring member 32 having a PET film or the like attached to a rotating shaft, an opening 30 inclined to the partition wall with the development unit 4 corresponding to the opening on the development unit 4 side, and the opening in the toner storage unit 3. A backflow prevention valve 31 using, for example, a 50 μm PET film having a lower side fixed to the rib 33 and a supply roller 41 side as a free end is provided on the outer wall side of 30. The rib 33 prevents the fixed backflow prevention valve 31 and the agitating member 32 from directly contacting each other, brings the backflow prevention valve 31 closer to the supply roller side, and a toner storage portion that is separate from the developing portion 4. In order to facilitate attachment and detachment when attaching / detaching 3, it is provided with the same inclination as the inclination of the opening 30 in the developing unit, that is, an inclination spreading in the removing direction when the toner storage unit 3 is configured to be detachable. Yes.

このように構成した本発明になる現像装置において、現像部4にトナーが充分ある場合、現像部4内のトナーは供給ローラ41によって運ばれて、供給ローラ41の回転方向下流側に設けられたトナー規制部材45で堰き止められ、トナー貯留部48にトナー溜まりが作られる。このトナー溜まりは、前記したように供給ローラ41の回転方向下流側が徐々に縮小されている空間であるから、トナー貯留部48に溜まるトナー量は、現像部4におけるトナー量を敏感に反映する。一方、撹拌部材32の回転によってトナー収納部3内のトナーが開口30に送られ、その粉圧で逆流防止弁31が現像部4側に開いてトナーを現像部4に供給しようとするが、この時、トナー貯留部48にトナー溜まりが作られていると、逆流防止弁31の自由端がそのトナー溜まりに当たって充分開くのが妨げられ、トナーが現像部4に供給されなくなる。   In the developing device according to the present invention configured as described above, when the developing unit 4 has a sufficient amount of toner, the toner in the developing unit 4 is carried by the supply roller 41 and provided downstream in the rotation direction of the supply roller 41. The toner is blocked by the toner regulating member 45, and a toner reservoir is created in the toner reservoir 48. Since the toner reservoir is a space where the downstream side in the rotation direction of the supply roller 41 is gradually reduced as described above, the toner amount accumulated in the toner reservoir 48 sensitively reflects the toner amount in the developing unit 4. On the other hand, the toner in the toner storage unit 3 is sent to the opening 30 by the rotation of the stirring member 32, and the backflow prevention valve 31 opens to the developing unit 4 side by the powder pressure to try to supply the toner to the developing unit 4. At this time, if a toner reservoir is formed in the toner reservoir 48, the free end of the backflow prevention valve 31 is prevented from being fully opened by hitting the toner reservoir, and the toner is not supplied to the developing unit 4.

逆に、前記したように感光体(像担持体)5上に形成された潜像を現像することで現像部4内内のトナーが消費されて少なくなっていると、トナーが供給ローラ41によって供給ローラ41の回転方向下流側に設けられたトナー規制部材45の位置に運ばれても、トナー貯留部48に溜まったトナーの下には空間が生じるから、トナーは重力で落下してしまい、このトナー貯留部48には大きなトナー溜まりが形成されず、それによって逆流防止弁31が充分開くことができ、トナーが現像部4に供給される。   Conversely, when the latent image formed on the photoconductor (image carrier) 5 is developed as described above and the toner in the developing unit 4 is consumed and reduced, the toner is supplied by the supply roller 41. Even if the toner is transported to the position of the toner regulating member 45 provided on the downstream side in the rotation direction of the supply roller 41, a space is created under the toner accumulated in the toner reservoir 48, so that the toner falls due to gravity. A large toner reservoir is not formed in the toner reservoir 48, whereby the backflow prevention valve 31 can be sufficiently opened and the toner is supplied to the developing unit 4.

すなわち、逆流防止弁31は、現像部4内のトナー量に見合って形成されるトナー貯留部48のトナー溜まりに対応して開くことになり、前記図4に示した従来装置のように、可動部材である逆流防止弁58に突起59を設けて現像部4内に送るトナー量を調節する方法に比較し、供給ローラ53と突起59のクリアランス設定やバラツキにより生じる問題が生じることが無く、また、供給されたトナーは、トナー規制部材45で供給量が制限されるから、逆流防止弁58を通過して追加補給されたトナーが直接供給ローラ53を経由して現像ローラ52に送られ、画像上にカブリが生じるなどの問題を起こすこともない。   That is, the backflow prevention valve 31 opens corresponding to the toner reservoir of the toner reservoir 48 formed in accordance with the amount of toner in the developing unit 4, and is movable like the conventional device shown in FIG. Compared with the method in which the protrusion 59 is provided on the backflow prevention valve 58, which is a member, and the amount of toner sent into the developing unit 4 is adjusted, there is no problem caused by the clearance setting or variation between the supply roller 53 and the protrusion 59. Since the supplied amount of toner is restricted by the toner regulating member 45, the additionally supplied toner passing through the backflow prevention valve 58 is directly sent to the developing roller 52 via the supply roller 53, and the image is supplied. It does not cause problems such as fogging.

図2は本発明の実施例2であり、前記実施例1ではトナー貯留部48を形成するため、供給ローラ41における現像ローラ40から見て回転方向下流側となる隔壁に、供給ローラ41側に突き出して供給ローラ41とのギャップが0.3mm程度としたトナー規制部材45を設けたが、この実施例2においては、この規制部材45の代わりに、例えば0.5mm程度のSUS箔を用いて供給ローラ41に軽く接触させるようにした規制部材46を設けた。   FIG. 2 shows a second embodiment of the present invention. In the first embodiment, in order to form the toner storage portion 48, the supply roller 41 has a partition wall on the downstream side in the rotation direction when viewed from the developing roller 40, and the supply roller 41 side. The toner regulating member 45 that protrudes and has a gap with the supply roller 41 of about 0.3 mm is provided. In the second embodiment, for example, a SUS foil of about 0.5 mm is used instead of the regulating member 45. A regulating member 46 is provided so as to be brought into light contact with the supply roller 41.

このように金属箔で規制部材46を構成すれば、その厚さは0.5mm程度であるから、供給ローラ41を前記したようにウレタンスポンジローラなどで構成しても傷を付ける心配はない。この規制部材46の作用は前記実施例1と全く同じであり、供給ローラ41の回転によって運ばれたトナーがこの規制部材46により、前記したように現像部4内のトナー量に応じたトナー貯留部48を形成し、形成されたトナー貯留部48に応じた量だけ逆流防止弁31が開いてトナーが現像部4内に供給されるから、常に現像部4内のトナー量に見合った量のトナーが供給されることは前記と全く同じである。   If the regulating member 46 is formed of metal foil in this way, the thickness thereof is about 0.5 mm. Therefore, even if the supply roller 41 is formed of a urethane sponge roller or the like as described above, there is no fear of damage. The operation of the restricting member 46 is exactly the same as that of the first embodiment, and the toner carried by the rotation of the supply roller 41 is stored by the restricting member 46 according to the toner amount in the developing unit 4 as described above. Since the portion 48 is formed and the backflow prevention valve 31 is opened by an amount corresponding to the formed toner storage portion 48 and the toner is supplied into the developing portion 4, an amount corresponding to the amount of toner in the developing portion 4 is always obtained. The supply of toner is exactly the same as described above.

このようにトナー収納部3、現像部4を構成することにより、逆流防止弁31は、撹拌部材32によって押されたトナーの粉圧によって図の上側に当たる自由端が開閉するようになっているが、逆流防止弁31はその自由端の開口方向に供給ローラ41と規制部材45、46によって形成されるトナー貯留部48が存在することになるから、現像部4側に多量のトナーが存在する場合はこのトナー貯留部48に多くのトナーが溜まり、逆流防止弁31はこのトナーの溜まりに邪魔されて大きく開口することができなくなる。従ってトナーの供給過剰が防止でき、逆に、現像部4側にトナーが少なくなったときはこのトナー貯留部48にトナーが溜まることがなく、逆流防止弁31は大きく開けるからトナーが充分供給され、従ってトナーの供給過剰によるカブリや、供給不足による画質不良などの事故を起こすことのない現像装置と画像形成装置を提供することができる。   By configuring the toner storage unit 3 and the developing unit 4 in this way, the free end corresponding to the upper side of the figure of the backflow prevention valve 31 is opened and closed by the powder pressure of the toner pushed by the stirring member 32. The backflow prevention valve 31 has a toner storage portion 48 formed by the supply roller 41 and the regulating members 45 and 46 in the opening direction of the free end thereof, so that a large amount of toner is present on the developing portion 4 side. A large amount of toner accumulates in the toner reservoir 48, and the backflow prevention valve 31 is obstructed by the toner reservoir and cannot be opened greatly. Therefore, excessive supply of toner can be prevented, and conversely, when toner becomes low on the developing unit 4 side, toner does not collect in the toner storage unit 48, and the backflow prevention valve 31 is opened widely, so that the toner is sufficiently supplied. Therefore, it is possible to provide a developing device and an image forming apparatus that do not cause an accident such as fogging due to excessive supply of toner and poor image quality due to insufficient supply.

そしてこのトナー貯留部48を、逆流防止弁31における供給ローラ41の回転方向下流側の空間としてあるから、供給ローラ41によって重力に逆らって機械的、電気的な力で運ばれて来るトナーは、トナー貯留部48の下に空間がある場合、すなわち現像部4にトナーが少なくなったときはこの機械的、電気的な力が無くなれば落下し、貯留ができなくなるから逆流防止弁31はより大きく開くことができ、現像部4におけるトナー量に従って供給されるトナー量が調節できることになる。   Since the toner storage section 48 is a space downstream of the supply roller 41 in the rotation direction of the backflow prevention valve 31, the toner conveyed by the supply roller 41 with mechanical and electrical force against gravity is When there is a space below the toner storage portion 48, that is, when the toner in the developing portion 4 is low, the mechanical flow and the electric force are lost, and the backflow prevention valve 31 is larger. The toner amount supplied can be adjusted according to the toner amount in the developing unit 4.

またトナー貯留部48は、供給ローラ41の回転方向下流側が徐々に縮小されている空間となっているから、現像部4におけるトナー量を敏感に反映する貯留部とすることができ、供給されるトナー量を正確に制御することができる。   Further, since the toner storage section 48 is a space that is gradually reduced on the downstream side in the rotation direction of the supply roller 41, the toner storage section 48 can be a storage section that sensitively reflects the toner amount in the developing section 4 and is supplied. The toner amount can be accurately controlled.

さらに、トナー貯留部48を形成するために設けた規制部材45は、前記したように供給ローラ41とのギャップが0.3mm程度とし、また、規制部材46は供給ローラ41に接触している金属箔としたから、供給されたトナーの通過量がこれら規制部材45、46で制限されて現像ローラ40に向かい、供給過剰でカブリが生じるといった事故を防止できる。   Further, the regulating member 45 provided for forming the toner storage portion 48 has a gap with the supply roller 41 of about 0.3 mm as described above, and the regulating member 46 is a metal in contact with the supply roller 41. Since the foil is used, the passing amount of the supplied toner is restricted by the regulating members 45 and 46 toward the developing roller 40, and an accident that fog occurs due to excessive supply can be prevented.

また、トナー収納部3と現像部4における開口30は、開口30のトナー貯留部48側が供給ローラ41側に近接するよう傾斜を有して設けられていることで、逆流防止弁31の自由端がより供給ローラ41に近づくことになり、より正確に供給トナー量を調節することができると共に、トナー収納部を着脱できるようにした場合に着脱が容易に、確実におこなえるようになる。   Further, the opening 30 in the toner storage unit 3 and the developing unit 4 is provided with an inclination so that the toner storage unit 48 side of the opening 30 is close to the supply roller 41 side, so that the free end of the backflow prevention valve 31 is provided. As the toner comes closer to the supply roller 41, the amount of supplied toner can be adjusted more accurately, and when the toner storage portion can be attached and detached, the attachment and detachment can be performed easily and reliably.

このように、供給ローラ41と近接または接触する部分に規制部材45、46を設けることにより、現像装置本体内部が2つの部屋に分割され、図における供給ローラ41下部の空間がトナーで充填され、逆流防止弁31が開かない程度に粉圧が上がった状態においても、供給ローラ41上部の空間にはトナーが充填されることがなく、トルク上昇や規制部における荷電不良などの問題が発生しないようにできる。   In this way, by providing the regulating members 45 and 46 in the vicinity of or in contact with the supply roller 41, the inside of the developing device main body is divided into two rooms, and the space below the supply roller 41 in the figure is filled with toner, Even in a state where the powder pressure is increased to such an extent that the backflow prevention valve 31 is not opened, the space above the supply roller 41 is not filled with toner, so that problems such as an increase in torque and a charging failure in the regulating portion do not occur. Can be.

本発明によれば、現像装置を現像部とトナー収納部の2室に分割し、トナー収納部と現像部の間に設けた開口部からトナーを追加補給できるようにした現像装置において、簡易な手段でトナーの供給過剰や供給不良を起こさないようにでき、画質低下を防止した画像形成装置における現像装置を提供することができる。   According to the present invention, in the developing device in which the developing device is divided into the two chambers of the developing portion and the toner storage portion, and toner can be additionally supplied from the opening provided between the toner storage portion and the developing portion, Thus, it is possible to provide a developing device in an image forming apparatus that can prevent excessive supply or poor supply of toner by means, and prevent image quality deterioration.

本発明になる現像装置の実施例1の構成概略を示した図である。It is the figure which showed the structure outline of Example 1 of the image development apparatus which becomes this invention. 同じく同じく本発明になる現像装置の実施例2の構成概略を示した図である。Similarly, it is a diagram showing a schematic configuration of Example 2 of the developing device according to the present invention. 本発明になる現像装置を用いた画像形成装置の一例として、現像装置をロータリー型とした画像形成装置の構成概略を示した断面図である。1 is a cross-sectional view illustrating a schematic configuration of an image forming apparatus in which a developing device is a rotary type as an example of an image forming apparatus using a developing device according to the present invention. 現像装置を現像部とトナー収納部の2室に分割し、トナー収納部と現像部の間に設けた開口部からトナーを追加補給できるようにした従来の現像装置の概略構成を示した図である。FIG. 6 is a diagram illustrating a schematic configuration of a conventional developing device in which a developing device is divided into two chambers, a developing unit and a toner storage unit, and toner can be additionally supplied from an opening provided between the toner storage unit and the developing unit. is there.

符号の説明Explanation of symbols

3 トナー収納部
4 現像部
30 開口
31 逆流防止弁
32 撹拌部材
33 リブ
40 現像ローラ
41 供給ローラ
42 規制ブレード
43 押圧部材
44 シール部材
45 トナー規制部材
46 トナー規制部材
47 突出部
48 トナー貯留部
DESCRIPTION OF SYMBOLS 3 Toner accommodating part 4 Developing part 30 Opening 31 Backflow prevention valve 32 Stirring member 33 Rib 40 Developing roller 41 Supply roller 42 Restricting blade 43 Pressing member 44 Seal member 45 Toner restricting member 46 Toner restricting member 47 Protruding part 48 Toner storing part

Claims (12)

潜像を担持する像担持体と相対して該像担持体上の潜像を現像する現像ローラと、該現像ローラにトナーを供給する供給ローラとを内蔵する現像部と、該現像部にトナーを供給するトナー収納部とからなり、該トナー収納部と前記現像部が接する位置に設けたトナー供給用開口に、前記現像部内に開口可能な逆流防止弁を有する画像形成装置における現像装置において、
前記逆流防止弁が開口する方向の現像部内に、トナーの貯留部を設ける手段が存在することを特徴とする画像形成装置における現像装置。
A developing portion that includes a developing roller that develops the latent image on the image bearing member relative to the image bearing member that carries the latent image, a supply roller that supplies toner to the developing roller, and a toner in the developing portion In the developing device in the image forming apparatus, the toner containing portion is configured to have a backflow prevention valve that can be opened in the developing portion at a toner supply opening provided at a position where the toner containing portion and the developing portion are in contact with each other.
A developing device in an image forming apparatus, wherein means for providing a toner storage portion exists in a developing portion in a direction in which the backflow prevention valve opens.
前記トナー貯留部を、前記逆流防止弁の供給ローラ回転方向下流側の空間としたことを特徴とする請求項1に記載した画像形成装置における現像装置。   2. The developing device in an image forming apparatus according to claim 1, wherein the toner storage portion is a space downstream of the backflow prevention valve in the rotation direction of the supply roller. 前記トナー貯留部は、前記供給ローラ回転方向下流側が徐々に縮小されている空間であることを特徴とする請求項1に記載した画像形成装置における現像装置。   2. The developing device in an image forming apparatus according to claim 1, wherein the toner storage portion is a space in which the downstream side in the rotation direction of the supply roller is gradually reduced. 前記トナー貯留部を設ける手段は、前記逆流防止弁の供給ローラ回転方向下流側の現像部壁に前記供給ローラと僅少な間隔を有して設けられた規制部材であることを特徴とする請求項1に記載した画像形成装置における現像装置。   The means for providing the toner reservoir is a regulating member provided on the developing unit wall on the downstream side in the rotation direction of the supply roller of the backflow prevention valve with a slight gap from the supply roller. 1. A developing device in the image forming apparatus described in 1. 前記トナー貯留部を設ける手段は、前記逆流防止弁の供給ローラ回転方向下流側の現像部壁に前記供給ローラと接して設けられた可撓性部材であることを特徴とする請求項1に記載した画像形成装置における現像装置。   The means for providing the toner reservoir is a flexible member provided in contact with the supply roller on the developing unit wall on the downstream side in the rotation direction of the supply roller of the backflow prevention valve. The developing device in the image forming apparatus. 前記トナー収納部と現像部における開口は、前記トナー収納部を着脱可能に構成した場合に取り外し方向へ広がる傾斜を有して設けられていることを特徴とする請求項1に記載した画像形成装置における現像装置。   The image forming apparatus according to claim 1, wherein the opening in the toner storage portion and the developing portion is provided with an inclination that widens in a removal direction when the toner storage portion is configured to be detachable. Development device. 潜像を担持する像担持体と、該像担持体上の潜像を現像する現像ローラ及び該現像ローラへトナーを運ぶ供給ローラとを有して回転可能に構成した円筒状のロータリー型ラックに固定され、該ロータリー型ラックの回転により、前記現像ローラが順次前記像担持体に対面する位置に運ばれる複数の現像部と、該各現像部に隣接されて前記ロータリー型ラックまたは前記現像部に着脱可能に支持されたトナー収納部とからなり、該トナー収納部と前記現像部が接する位置に設けたトナー供給用開口に、前記現像部内に開口可能な逆流防止弁を設けた現像装置を有する画像形成装置において、
前記逆流防止弁が開口する方向の現像部内に、トナーの貯留部を設ける手段が存在することを特徴とする画像形成装置における現像装置。
A cylindrical rotary rack having an image carrier that carries a latent image, a developing roller that develops the latent image on the image carrier, and a supply roller that carries toner to the developing roller, and is configured to be rotatable. A plurality of developing units that are fixedly moved to a position where the developing roller sequentially faces the image carrier by rotation of the rotary rack, and adjacent to each developing unit, the rotary rack or the developing unit. And a developing device provided with a toner supply opening provided at a position where the toner storage portion and the developing portion are in contact with each other, and a backflow prevention valve that can be opened in the developing portion. In the image forming apparatus,
A developing device in an image forming apparatus, wherein means for providing a toner storage portion exists in a developing portion in a direction in which the backflow prevention valve opens.
前記トナー貯留部を、前記逆流防止弁の供給ローラ回転方向下流側の空間としたことを特徴とする現像装置を有する請求項7に記載した画像形成装置。   The image forming apparatus according to claim 7, wherein the toner storage portion is a space downstream of the backflow prevention valve in the rotation direction of the supply roller. 前記トナー貯留部は、前記供給ローラ回転方向下流側が徐々に縮小されている空間であることを特徴とする現像装置を有する請求項7に記載した画像形成装置。   The image forming apparatus according to claim 7, wherein the toner storage unit is a space in which the downstream side in the rotation direction of the supply roller is gradually reduced. 前記トナー貯留部を設ける手段は、前記逆流防止弁の供給ローラ回転方向下流側の現像部壁に前記供給ローラと僅少な間隔を有して設けられた規制部材であることを特徴とする現像装置を有する請求項7に記載した画像形成装置。   The developing device is characterized in that the means for providing the toner storage portion is a regulating member provided on the developing portion wall on the downstream side in the rotation direction of the supply roller of the backflow prevention valve with a slight gap from the supply roller. The image forming apparatus according to claim 7, comprising: 前記トナー貯留部を設ける手段は、前記逆流防止弁の供給ローラ回転方向下流側の現像部壁に前記供給ローラと接して設けられた可撓性部材であることを特徴とする現像装置を有する請求項7に記載した画像形成装置。   The developing device characterized in that the means for providing the toner storage portion is a flexible member provided in contact with the supply roller on the developing portion wall on the downstream side in the rotation direction of the supply roller of the backflow prevention valve. Item 8. The image forming apparatus according to Item 7. 前記トナー収納部と現像部における開口は、前記トナー収納部を着脱可能に構成した場合に取り外し方向へ広がる傾斜を有して設けられていることを特徴とする現像装置を有する請求項7に記載した画像形成装置。   8. The developing device according to claim 7, wherein the opening in the toner storage portion and the development portion is provided with a slope that widens in a removal direction when the toner storage portion is configured to be detachable. Image forming apparatus.
JP2004123457A 2004-04-19 2004-04-19 Developing device and image forming apparatus having the developing device Expired - Fee Related JP4467049B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2004123457A JP4467049B2 (en) 2004-04-19 2004-04-19 Developing device and image forming apparatus having the developing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004123457A JP4467049B2 (en) 2004-04-19 2004-04-19 Developing device and image forming apparatus having the developing device

Publications (2)

Publication Number Publication Date
JP2005308907A true JP2005308907A (en) 2005-11-04
JP4467049B2 JP4467049B2 (en) 2010-05-26

Family

ID=35437793

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2004123457A Expired - Fee Related JP4467049B2 (en) 2004-04-19 2004-04-19 Developing device and image forming apparatus having the developing device

Country Status (1)

Country Link
JP (1) JP4467049B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8180263B2 (en) 2006-12-28 2012-05-15 Oki Data Corporation Developing apparatus and image forming apparatus that incorporates the developing apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8180263B2 (en) 2006-12-28 2012-05-15 Oki Data Corporation Developing apparatus and image forming apparatus that incorporates the developing apparatus

Also Published As

Publication number Publication date
JP4467049B2 (en) 2010-05-26

Similar Documents

Publication Publication Date Title
US7209685B2 (en) Developing device, image forming apparatus and process cartridge including replenishment openings
JP2007286290A (en) Developing device and image forming apparatus equipped with the same
JP2007256392A (en) Toner replenishing method, toner replenishing device, developing device, and image forming apparatus
US7502578B2 (en) Electrophotographic development apparatus
JP5476695B2 (en) Developing device, process cartridge, and image forming apparatus
JP5515706B2 (en) Developing device, process cartridge, and image forming apparatus
JP4095544B2 (en) Development device
JP4852391B2 (en) Developing device, process cartridge, and image forming apparatus
JP4370195B2 (en) Developing device and image forming apparatus having the developing device
JP4467049B2 (en) Developing device and image forming apparatus having the developing device
JP2006338029A (en) Development cartridge and electrophotographic image forming apparatus using the same
JP2009025493A (en) Developing device and image forming apparatus
KR100611988B1 (en) Developer device and image-forming apparatus adopting the same
JP2005128525A (en) Toner cartridge for electrophotographic image forming apparatus
JP5531644B2 (en) Image forming apparatus
JP2006268013A (en) Developing device
JP5317796B2 (en) Image forming apparatus
JP2007183519A (en) Developing device, image forming method, process cartridge and image forming apparatus
JP5332385B2 (en) Developing device, process cartridge, and image forming apparatus
JP2009042418A (en) Developing device and image forming device
JP4643336B2 (en) Developing device, image forming apparatus, and process cartridge
JP4794772B2 (en) Image forming apparatus
JP6033596B2 (en) Image forming apparatus and toner supply device
JP2006047387A (en) Developing unit replacement method for color image forming apparatus
JP2005195883A (en) Developing device and image forming apparatus equipped therewith

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20070330

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20090807

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20091005

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20100129

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20100222

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130305

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130305

Year of fee payment: 3

S533 Written request for registration of change of name

Free format text: JAPANESE INTERMEDIATE CODE: R313533

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130305

Year of fee payment: 3

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130305

Year of fee payment: 3

LAPS Cancellation because of no payment of annual fees