JP2006220817A - Developing device - Google Patents

Developing device Download PDF

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JP2006220817A
JP2006220817A JP2005032901A JP2005032901A JP2006220817A JP 2006220817 A JP2006220817 A JP 2006220817A JP 2005032901 A JP2005032901 A JP 2005032901A JP 2005032901 A JP2005032901 A JP 2005032901A JP 2006220817 A JP2006220817 A JP 2006220817A
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developing
screw
chamber
developing device
stirring
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Tetsuo Awaya
哲郎 粟屋
Hitoshi Nishitani
仁志 西谷
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Canon Inc
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Canon Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a developing device capable of preventing a fluctuation in T/C ratio to be detected before and behind exchange of a developing device and preventing an image density adjustment defect. <P>SOLUTION: The developing device includes a developing sleeve rotatably supported to serve as a developer carrier, a developing chamber screw rotatably supported adjacently to the developing sleeve and having a spiral surface in the central axis direction of the rotation, an agitating chamber screw rotatably supported adjacently to the developing screw and having a spiral surface in the central axis direction of the rotation, a developing chamber holding the developing chamber screw, an agitating chamber holding the agitating chamber screw, and a developing container formed with a developer replenishing port on the upperside of agitating chamber. A portion of the agitating chamber and a portion of the agitating screw are supported by an image forming apparatus main body. The developing device is attachable and detachable except a portion of the agitating chamber and a portion of the agitating screw which are made to remain in the image forming apparatus body. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、シート材上に画像形成を行う複写機、レーザビームプリンタ（ＬＢＰ）等の画像形成装置に備えられる現像装置に関するものである。   The present invention relates to a developing device provided in an image forming apparatus such as a copying machine or a laser beam printer (LBP) that forms an image on a sheet material.

図７及び図８に本発明の従来例を示す。   7 and 8 show a conventional example of the present invention.

従来、この種の画像形成装置においては、現像剤担持体の表面に顕画剤としての乾式現像剤を担持し、静電潜像を担持した像担持体の表面近傍に現像剤を搬送供給し、像担持体と現像剤担持体の間に交互（交番）電界を印加しながら静電潜像を現像して顕像化する方法が良く知られている。   Conventionally, in this type of image forming apparatus, a dry developer as a developer is carried on the surface of the developer carrying member, and the developer is conveyed and supplied near the surface of the image carrying member carrying the electrostatic latent image. A method for developing and developing an electrostatic latent image while applying an alternating (alternate) electric field between an image carrier and a developer carrier is well known.

尚、上記現像剤担持体は一般に現像スリーブが用いられる場合が多いために以下の説明では「現像スリーブ」と称し、又、像担持体は一般に感光ドラムが用いられる場合が多いために以下の説明では「感光ドラム」と称することとする。   The developer carrier is generally referred to as a “development sleeve” in the following description because a developing sleeve is often used. The image carrier is generally referred to as a photosensitive drum, and thus the following description. In this case, it is referred to as “photosensitive drum”.

現像方法として、従来、例えば２成分系組成（キャリア粒子とトナー粒子）から成る現像剤（２成分現像剤）を用い、内部に磁石を配置した現像スリーブの表面に磁気ブラシを形成し、微小な現像間隙を保持して対向された感光ドラムにこの磁気ブラシを摺擦又は近接させ、現像スリーブと感光ドラム間（Ｓ−Ｄ間）に連続的に交互電界を印加することによって、トナー粒子の現像スリーブ側から感光ドラム側への転移及び逆転移を繰り返し行わせて現像を行う所謂磁気ブラシ現像法が知られている（例えば、特許文献１，２参照）。   As a developing method, conventionally, for example, a developer (two-component developer) composed of a two-component composition (carrier particles and toner particles) is used, and a magnetic brush is formed on the surface of a developing sleeve in which a magnet is disposed. The magnetic brush is rubbed or brought close to the opposing photosensitive drum while holding the developing gap, and an alternating electric field is continuously applied between the developing sleeve and the photosensitive drum (between SD) to develop toner particles. There is known a so-called magnetic brush development method in which development is performed by repeatedly performing transition and reverse transition from the sleeve side to the photosensitive drum side (see, for example, Patent Documents 1 and 2).

上記２成分磁気ブラシ現像用の現像装置は図７及び図８に示すような構成となっている。図７は従来の現像装置の断面図、図８は平面図であり、図中、１０１は現像スリーブ、１０２は現像スリーブ１０１中に固定配置されたマグネットローラ、１０３は現像室スクリュー、１０４は撹拌室スクリュー、１０５は現像容器、１０５ａはトナーの補給口、１０５ｂは現像室、１０５ｃは撹拌室、１０６は現像剤を現像スリーブ１０１の表面に薄層形成するために配置された規制ブレード、１０７はトナーを貯蔵するトナー容器、１０８はトナー容器１０７から現像装置へトナーを補給する補給スクリューである。図示の通り、現像スリーブ１０１は感光ドラム１０９に対して近接配置され、感光ドラム１０９と逆方向又は同一方向に回転し、現像剤（斜線で図示）が感光ドラム１０９に対して接触する状態で現像できるよう設定されている。   The developing device for developing the two-component magnetic brush is configured as shown in FIGS. 7 is a cross-sectional view of a conventional developing device, and FIG. 8 is a plan view. In the figure, 101 is a developing sleeve, 102 is a magnet roller fixedly arranged in the developing sleeve 101, 103 is a developing chamber screw, and 104 is stirring. The chamber screw, 105 is a developing container, 105a is a toner supply port, 105b is a developing chamber, 105c is a stirring chamber, 106 is a regulating blade arranged to form a thin layer of developer on the surface of the developing sleeve 101, 107 is A toner container 108 for storing toner is a supply screw for supplying toner from the toner container 107 to the developing device. As shown in the figure, the developing sleeve 101 is disposed close to the photosensitive drum 109, rotates in the opposite direction or the same direction as the photosensitive drum 109, and is developed in a state where the developer (shown by hatching) is in contact with the photosensitive drum 109. It is set to be possible.

現像容器１０５中には、トナー粒子と磁性キャリアが混合された現像剤が収容されており、トナー粒子と磁性キャリアの混合比（以後、Ｔ／Ｃ比と称す）は、現像により消費されたトナーに見合った量のトナーが補給用トナーが収容されているトナー容器１０７から補給スクリュー１０８によって補給される。そして、補給された現像剤は、現像容器１０５の補給口１０５ａを経て、撹拌室スクリュー１０４が設けられた撹拌室へ落下補給されることによってＴ／Ｃ比は一定に保たれている。このときの現像容器１０５中のトナー粒子と磁性キャリアの混合比の検知及び維持方法としては従来から様々な方式が提案されている。   Developer container 105 contains a developer in which toner particles and magnetic carrier are mixed, and the mixing ratio of toner particles and magnetic carrier (hereinafter referred to as T / C ratio) is the toner consumed by development. The amount of toner corresponding to the above is replenished by the replenishing screw 108 from the toner container 107 containing the replenishing toner. Then, the replenished developer passes through the replenishing port 105a of the developing container 105 and is dropped and replenished to the stirring chamber provided with the stirring chamber screw 104, so that the T / C ratio is kept constant. Various methods have been proposed for detecting and maintaining the mixing ratio of the toner particles and the magnetic carrier in the developing container 105 at this time.

例えば、感光ドラムの周辺に検知手段を設け、現像スリーブ側から感光ドラム側へ転位したトナーに光を当て、このときの透過光と反射光からトナー補給量を調整してＴ／Ｃ比を維持する方式、現像スリーブ上に検知手段を設け、現像スリーブ上に塗布された現像剤に光を当てたときの反射光からＴ／Ｃ比を検知する方式、現像容器中にセンサを設け、コイルのインダクタンスを利用してセンサ近傍の一定体積内の現像剤の見掛け透磁率μの変化を検知し、Ｔ／Ｃ比を検知する方式（以下、トナー濃度検知センサと称す）等が提案され実用化されている。   For example, a detecting means is provided around the photosensitive drum, and light is applied to the toner transferred from the developing sleeve side to the photosensitive drum side, and the T / C ratio is maintained by adjusting the toner replenishment amount from the transmitted light and reflected light at this time. A method for detecting the T / C ratio from reflected light when light is applied to the developer applied on the developing sleeve, a sensor in the developing container, A method of detecting a change in the apparent magnetic permeability μ of a developer in a fixed volume near the sensor by using an inductance and detecting a T / C ratio (hereinafter referred to as a toner concentration detection sensor) has been proposed and put into practical use. ing.

上記現像剤の透磁率変化を利用したトナー濃度検知センサは、例えば透磁率が大きくなった場合には一定体積で現像剤中のＴ／Ｃ比が低くなったことを意味し、これは現像剤中のトナー量が減ったことを意味するためにトナー補給を開始し、逆に透磁率が小さくなった場合には一定体積内で現像剤中のＴ／Ｃ比が高くなったことを意味し、現像剤中のトナー量が増えたことを意味するためにトナー補給を停止するようなシーケンスに基づいてＴ／Ｃ比を制御する。   The toner concentration detection sensor using the change in the magnetic permeability of the developer means that, for example, when the magnetic permeability is increased, the T / C ratio in the developer is lowered at a constant volume, which means that the developer When the toner replenishment is started to mean that the amount of toner in the toner has decreased. On the contrary, when the magnetic permeability decreases, it means that the T / C ratio in the developer has increased within a certain volume. The T / C ratio is controlled based on a sequence in which toner supply is stopped in order to mean that the amount of toner in the developer has increased.

一方、図８に示すように、現像スリーブ１０２、現像室スクリュー１０３、撹拌室スクリュー１０４は図示されていないモータ等の駆動源からギア列等の駆動伝達手段を経て回転駆動され、所定の方向へ所定の速度で回転することによって、現像容器１０５中の現像剤は図示矢印方向に循環する。格子線で示しているのはトナーの補給口１０５ａの位置である。この補給口１０５ａから補給された新しいトナーは、撹拌室の図示Ａの長さを搬送される間に現像剤と均一に撹拌され、十分に摩擦帯電を受けて現像室へと循環する。現像室では、マグネットローラ１０２が形成する現像磁界によって現像剤の磁気ブラシが形成され、磁気ブラシに付着しているトナーと現像スリーブ１０２表面に付着しているトナーが感光ドラム１０９に形成された静電潜像の画像領域に転移して現像が行われる。   On the other hand, as shown in FIG. 8, the developing sleeve 102, the developing chamber screw 103, and the agitating chamber screw 104 are rotationally driven from a driving source such as a motor (not shown) through a driving transmission means such as a gear train in a predetermined direction. By rotating at a predetermined speed, the developer in the developer container 105 circulates in the direction of the arrow shown in the figure. What is indicated by the grid lines is the position of the toner supply port 105a. The new toner replenished from the replenishing port 105a is uniformly agitated with the developer while being conveyed through the length A of the agitating chamber, and is sufficiently charged with friction and circulated to the developing chamber. In the developing chamber, a magnetic brush of developer is formed by the developing magnetic field formed by the magnet roller 102, and the toner adhering to the magnetic brush and the toner adhering to the surface of the developing sleeve 102 are formed on the photosensitive drum 109. Development is performed by transferring to the image area of the electrostatic latent image.

特開昭５５−０３２０６０号公報JP-A-55-032060 特開昭５９−１６５０８２号公報JP 59-165082 A

しかしながら、前記従来例においては以下の問題点があった。   However, the conventional example has the following problems.

即ち、上記Ｔ／Ｃ比検知方式においてインダクタンスセンサを用いる方式では、現像装置の寿命等で現像装置を交換しなければならない場合、トナー濃度検知センサは高価であるため、現像装置のトナー濃度検知センサを取り外し不可とすると、ランニングコストアップとなる。   That is, in the method using an inductance sensor in the above T / C ratio detection method, when the developing device needs to be replaced due to the life of the developing device or the like, the toner concentration detection sensor is expensive. If it cannot be removed, running costs will increase.

又、現像装置に備えたトナー濃度検知センサを、現像装置の交換時のみ、旧現像装置より取り外して新現像装置に取り付ける方法では、部品精度のばらつき等により位置の再現性が難しいため、検知するＴ／Ｃ比が変動して検知不良による濃度調整不良が発生する可能性がある。   In addition, the method of removing the toner density detection sensor provided in the developing device from the old developing device and attaching it to the new developing device only when the developing device is replaced is difficult to detect because the position reproducibility is difficult due to variations in parts accuracy. There is a possibility that the T / C ratio fluctuates and density adjustment failure due to detection failure occurs.

更に、画像形成装置本体にトナー濃度検知センサを備え、現像装置の外側からＴ／Ｃ比検知を行おうとすると、現像装置とトナー濃度検知センサの位置決め精度により検知するＴ／Ｃ比が変動するため、検知不良による濃度調整不良が発生する可能性がある。   Further, when the toner density detection sensor is provided in the image forming apparatus main body and T / C ratio detection is performed from the outside of the developing device, the detected T / C ratio varies depending on the positioning accuracy of the developing device and the toner density detection sensor. There is a possibility that a density adjustment failure due to a detection failure may occur.

本発明は上記問題に鑑みてなされたもので、その目的とする処は、現像装置交換前後での検知するＴ／Ｃ比の変動を防止し、画像濃度調整不良を防止することができる現像装置を提供することにある。   SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and the object of the present invention is to develop a developing device that can prevent fluctuations in the T / C ratio detected before and after replacement of the developing device and prevent poor image density adjustment. Is to provide.

上記目的を達成するため、本発明は、回転可能に支持され現像剤担持体となる現像スリーブと、前記現像スリーブに隣接して回転可能に支持され回転中心軸方向に螺旋面を持つ現像室スクリューと、前記現像スクリューに隣接して回転可能に支持され回転中心軸方向に螺旋面を持つ攪拌室スクリューと、前記現像室スクリューを保持する現像室と、前記攪拌室スクリューを保持する攪拌室と、攪拌室の上方に現像剤補給口が形成された現像容器を備えた現像装置において、前記攪拌室の一部と前記攪拌スクリューの一部は画像形成装置本体が支持しており、前記現像装置は前記攪拌室の一部と前記攪拌スクリューの一部を画像形成装置本体に残して着脱可能であることを特徴とする。又、前記攪拌室の一部にはトナー濃度検知センサを備えていることを特徴とする。   To achieve the above object, the present invention provides a developing sleeve that is rotatably supported and serves as a developer carrier, and a developing chamber screw that is rotatably supported adjacent to the developing sleeve and has a spiral surface in the direction of the rotation center axis. A stirring chamber screw that is rotatably supported adjacent to the developing screw and has a spiral surface in the direction of the rotation center axis, a developing chamber that holds the developing chamber screw, and a stirring chamber that holds the stirring chamber screw; In the developing device including a developing container in which a developer supply port is formed above the stirring chamber, an image forming apparatus main body supports a part of the stirring chamber and a part of the stirring screw. A part of the agitation chamber and a part of the agitation screw may be attached and detached while leaving the main body of the image forming apparatus. Further, a toner concentration detection sensor is provided in a part of the stirring chamber.

又、前記現像室スクリューの中心軸を水平とした場合、前記攪拌室スクリューの中心軸は攪拌室スクリューが回転した時その螺旋面が進む方向へ上昇する向きに傾斜しており、画像形成装置本体に残る前記攪拌室の一部と前記現像装置の前記攪拌室の間にはトナーシャッターが設けられていることを特徴とする。   When the central axis of the developing chamber screw is horizontal, the central axis of the agitating chamber screw is inclined so as to rise in the direction in which the spiral surface advances when the agitating chamber screw rotates. A toner shutter is provided between a part of the stirring chamber remaining in the chamber and the stirring chamber of the developing device.

本発明によれば、トナー濃度検知センサの現像装置内のトナーに対する位置精度の再現性を確保できるため、現像装置交換前後での検知するＴ／Ｃ比の変動を防止し、画像濃度調整不良を防止することができる。更に、トナー濃度検知センサを画像形成装置本体に残すことができるため、現像装置のコストダウンとなり、ランニングコストを低く抑えることができる。   According to the present invention, since the reproducibility of the positional accuracy of the toner density detection sensor with respect to the toner in the developing device can be ensured, fluctuations in the T / C ratio detected before and after replacement of the developing device can be prevented, and poor image density adjustment can be achieved. Can be prevented. Furthermore, since the toner density detection sensor can be left in the main body of the image forming apparatus, the cost of the developing device can be reduced and the running cost can be kept low.

又、上記利点と共に、現像装置交換時のトナー飛散等を防止し、現像装置の交換作業性の向上を図ることができる。   In addition to the above advantages, it is possible to prevent toner scattering and the like when replacing the developing device, and to improve the workability of replacing the developing device.

以下に本発明の実施の形態を添付図面に基づいて説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

＜実施の形態１＞
図１及び図２は本発明の第１の実施例における現像装置の上視図であり、１は現像スリーブ、３は現像室スクリュー、４は撹拌室スクリュー、５は現像容器である。現像容器５の内部は現像室５ｂと撹拌室５ｃに区画されており５ｄはその隔壁である。撹拌室５ｃの上部に設けられた補給口５ａから、図示されていない補給スクリュー８の作用によって、現像で消費されたトナーに見合った量のトナーが撹拌室５ｃ内に落下補給される。 <Embodiment 1>
1 and 2 are top views of the developing device according to the first embodiment of the present invention, in which 1 is a developing sleeve, 3 is a developing chamber screw, 4 is a stirring chamber screw, and 5 is a developing container. The inside of the developing container 5 is divided into a developing chamber 5b and a stirring chamber 5c, and 5d is a partition wall. An amount of toner commensurate with the toner consumed by development is dropped and replenished from the replenishing port 5a provided in the upper part of the agitating chamber 5c into the agitating chamber 5c by the action of a replenishing screw 8 (not shown).

撹拌室５ｃにおいて撹拌室スクリュー４の作用によりトナーと現像剤の撹拌、摩擦帯電が行われ、その現像剤が現像室５ｂの現像室スクリュー３の作用により現像容器５内を循環し、マグネットローラで形成される磁気ブラシによって感光ドラムの静電潜像が現像されることは従来例と同様である。図中の矢印は現像剤の循環方向を示している。   In the agitating chamber 5c, the toner and the developer are agitated and frictionally charged by the action of the agitating chamber screw 4, and the developer circulates in the developing container 5 by the action of the developing chamber screw 3 in the developing chamber 5b. The electrostatic latent image on the photosensitive drum is developed by the formed magnetic brush as in the conventional example. The arrows in the figure indicate the developer circulation direction.

攪拌室５ｃは第１攪拌室５ｃ１、第２攪拌室５ｃ２、第３攪拌室５ｃ３に分かれており、第１攪拌室５ｃ１と第３攪拌室５ｃ３は現像装置に、第２攪拌室５ｃ２は画造形性装置本体１３にそれぞれ固定されている。第２攪拌室５ｃ２には、コイルのインダクタンスを利用してセンサ近傍の一定体積内の現像剤の見掛け透磁率μの変化を検知しＴ／Ｃ比を検知するトナー濃度検知センサ１４が備えられている。   The stirring chamber 5c is divided into a first stirring chamber 5c1, a second stirring chamber 5c2, and a third stirring chamber 5c3. The first stirring chamber 5c1 and the third stirring chamber 5c3 are a developing device, and the second stirring chamber 5c2 is an image forming unit. Are respectively fixed to the sex device main body 13. The second stirring chamber 5c2 is provided with a toner concentration detection sensor 14 for detecting a change in the apparent permeability μ of the developer in a certain volume near the sensor by using the inductance of the coil and detecting the T / C ratio. Yes.

攪拌スクリュー４は、第１攪拌スクリュー４ａ、第２攪拌スクリュー４ｂ、第３攪拌スクリュー４ｃに分かれており、第１攪拌スクリュー４ａと第３攪拌スクリュー４ｃは、現像装置に、第２攪拌スクリュー４ｂは第２攪拌室５ｃ２に、それぞれ回転自在に支持されている。現像装置を画像形成装置本体にセットしたとき、第１攪拌スクリュー４ａ、第２攪拌スクリュー４ｂ、第３攪拌スクリュー４ｃは、不図示のカップリングでそれぞれ連結し、ともにトナー攪拌を行う。   The agitation screw 4 is divided into a first agitation screw 4a, a second agitation screw 4b, and a third agitation screw 4c. The first agitation screw 4a and the third agitation screw 4c are connected to the developing device, and the second agitation screw 4b is Each of the second stirring chambers 5c2 is rotatably supported. When the developing device is set in the main body of the image forming apparatus, the first stirring screw 4a, the second stirring screw 4b, and the third stirring screw 4c are connected by a coupling (not shown), and both perform toner stirring.

今、現像装置を矢印Ａ方向に移動させ、画造形性装置本体より取り出す。このとき、図２に示すように、第２攪拌室５ｃ２と第２攪拌スクリュー４ｂは共に画像形成装置本体１３に残る。第２攪拌室５ｃ２に支持されたトナー濃度検知センサ１４も画像形成装置本体１３に残る。その後、新しい現像装置を画像形成装置本体にセットする。このとき、現像装置の交換前後で、第２攪拌室５ｃ２・第２攪拌スクリュー４ｂ・トナー濃度検知センサ１４の位置関係は変わらない。そのため、トナー濃度検知センサの現像装置内のトナーに対する位置精度の再現性を確保できる、現像装置交換前後での検知するＴ／Ｃ比の変動を防止し、画像濃度調整不良を防止することができる。更に、トナー濃度検知センサを画像形成装置本体に残すことができるため、現像装置のコストダウンとなり、ランニングコストを低く抑えることができる。   Now, the developing device is moved in the direction of arrow A and taken out from the image forming device main body. At this time, as shown in FIG. 2, both the second stirring chamber 5 c 2 and the second stirring screw 4 b remain in the image forming apparatus main body 13. The toner concentration detection sensor 14 supported in the second stirring chamber 5c2 also remains in the image forming apparatus main body 13. Thereafter, a new developing device is set in the image forming apparatus main body. At this time, the positional relationship among the second stirring chamber 5c2, the second stirring screw 4b, and the toner concentration detection sensor 14 does not change before and after the replacement of the developing device. Therefore, the reproducibility of the positional accuracy with respect to the toner in the developing device of the toner density detection sensor can be ensured, the fluctuation of the detected T / C ratio before and after replacement of the developing device can be prevented, and the poor image density adjustment can be prevented. . Furthermore, since the toner density detection sensor can be left in the main body of the image forming apparatus, the cost of the developing device can be reduced and the running cost can be kept low.

＜実施の形態２＞
以下に、図３〜図６を用いて本発明の実施の形態について説明する。ここで、図３は本発明の実施の形態２における現像装置の上視図、図４は同現像装置の側面図、図５は同現像装置の上視図、図６は同現像装置の側面図である
本実施の形態は、実施の形態１と共通の部分が多いため、特徴的な部分のみ説明する。 <Embodiment 2>
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 3 is a top view of the developing device according to Embodiment 2 of the present invention, FIG. 4 is a side view of the developing device, FIG. 5 is a top view of the developing device, and FIG. 6 is a side view of the developing device. Since the present embodiment has many parts in common with the first embodiment, only characteristic parts will be described.

図４に示すように、第１攪拌室５ｃ１、第２攪拌室５ｃ２、第３攪拌室５ｃ３と、第１攪拌スクリュー４ａ、第２攪拌スクリュー４ｂ、第３攪拌スクリュー４ｃは、現像スリーブ１と現像室スクリュー３の軸方向に対して、軸方向が図の通り傾斜しており、その傾斜の方向は撹拌室スクリューにおける現像剤の搬送方向が上昇方向となる方向である。又、３つの攪拌室は、開口１７、開口１８を通してそれぞれ連結している。又、シャッター１５は第１攪拌室５ｃ１に、シャッター１６は第２攪拌室５ｃ２にそれぞれ開閉自在に設けられており、３つの攪拌室が連結している場合は開いている。   As shown in FIG. 4, the first stirring chamber 5c1, the second stirring chamber 5c2, the third stirring chamber 5c3, the first stirring screw 4a, the second stirring screw 4b, and the third stirring screw 4c are connected to the developing sleeve 1 and the developing. The axial direction is inclined as shown in the figure with respect to the axial direction of the chamber screw 3, and the direction of the inclination is a direction in which the developer conveyance direction in the stirring chamber screw is the upward direction. The three stirring chambers are connected to each other through an opening 17 and an opening 18. The shutter 15 is provided in the first stirring chamber 5c1 and the shutter 16 is provided in the second stirring chamber 5c2. The shutter 15 is open when three stirring chambers are connected.

今、図５に示すように現像装置を矢印Ａ方向に移動させ、画造形性装置本体より取り出す。このとき、第２攪拌室５ｃ２と第２攪拌スクリュー４ｂは共に画像形成装置本体１３に残る。第２攪拌室５ｃ２に支持されたトナー濃度検知センサ１４も画像形成装置本体１３に残る。   Now, as shown in FIG. 5, the developing device is moved in the direction of arrow A, and is taken out from the image forming apparatus main body. At this time, both the second stirring chamber 5c2 and the second stirring screw 4b remain in the image forming apparatus main body 13. The toner concentration detection sensor 14 supported in the second stirring chamber 5c2 also remains in the image forming apparatus main body 13.

又、不図示のリンク機構により、シャッター１５は開口１７を塞ぎ、シャッター１６は開口１８をそれぞれ塞ぐ。これにより、実施の形態１で説明した利点に加えて、現像装置交換時のトナー飛散等を防止し、現像装置の交換作業性の向上を図ることができる。   The shutter 15 closes the opening 17 and the shutter 16 closes the opening 18 by a link mechanism (not shown). Thereby, in addition to the advantages described in the first embodiment, it is possible to prevent toner scattering and the like when the developing device is replaced, and to improve the workability of replacing the developing device.

本発明の実施の形態１に係る現像装置の上視図である。FIG. 2 is a top view of the developing device according to the first embodiment of the present invention. 本発明の実施の形態１に係る現像装置の上視図である。FIG. 2 is a top view of the developing device according to the first embodiment of the present invention. 本発明の実施の形態２に係る現像装置の上視図である。FIG. 6 is a top view of a developing device according to a second embodiment of the present invention. 本発明の実施の形態２に係る現像装置の側面図である。It is a side view of the developing device concerning Embodiment 2 of the present invention. 本発明の実施の形態２に係る現像装置の上視図である。FIG. 6 is a top view of a developing device according to a second embodiment of the present invention. 本発明の実施の形態２に係る現像装置の側面図である。It is a side view of the developing device concerning Embodiment 2 of the present invention. 従来の現像装置の断面図である。It is sectional drawing of the conventional image development apparatus. 従来の現像装置の平面図である。It is a top view of the conventional developing device.

符号の説明Explanation of symbols

１ 現像スリーブ
３ 現像室スクリュー
４ａ 第１攪拌室スクリュー
４ｂ 第２攪拌室スクリュー
４ｃ 第３攪拌室スクリュー
５ 現像容器
５ｃ１ 第１攪拌室
５ｃ２ 第２攪拌室
５ｃ３ 第３攪拌室
８ａ 補給スクリュー
１４ トナー濃度検知センサ DESCRIPTION OF SYMBOLS 1 Developing sleeve 3 Developing chamber screw 4a 1st stirring chamber screw 4b 2nd stirring chamber screw 4c 3rd stirring chamber screw 5 Developing container 5c1 1st stirring chamber 5c2 2nd stirring chamber 5c3 3rd stirring chamber 8a Supply screw 14 Toner density detection Sensor

Claims (3)

回転可能に支持され現像剤担持体となる現像スリーブと、前記現像スリーブに隣接して回転可能に支持され回転中心軸方向に螺旋面を持つ現像室スクリューと、前記現像スクリューに隣接して回転可能に支持され回転中心軸方向に螺旋面を持つ攪拌室スクリューと、前記現像室スクリューを保持する現像室と、前記攪拌室スクリューを保持する攪拌室と、攪拌室の上方に現像剤補給口が形成された現像容器を備えた現像装置において、
前記攪拌室の一部と前記攪拌スクリューの一部は画像形成装置本体が支持しており、前記現像装置は前記攪拌室の一部と前記攪拌スクリューの一部を画像形成装置本体に残して着脱可能であることを特徴とする現像装置。 A developing sleeve that is rotatably supported and serves as a developer carrying member, a developing chamber screw that is rotatably supported adjacent to the developing sleeve and has a spiral surface in the direction of the rotation center axis, and rotatable adjacent to the developing screw A stirring chamber screw having a spiral surface in the direction of the rotation center axis, a developing chamber for holding the developing chamber screw, a stirring chamber for holding the stirring chamber screw, and a developer supply port formed above the stirring chamber In the developing device including the developed developer container,
A part of the stirring chamber and a part of the stirring screw are supported by the main body of the image forming apparatus, and the developing device is attached and detached while leaving a part of the stirring chamber and a part of the stirring screw in the main body of the image forming apparatus. A developing device capable of being used. 前記攪拌室の一部にはトナー濃度検知センサを備えていることを特徴とする請求項１記載の現像装置。   The developing device according to claim 1, wherein a toner concentration detection sensor is provided in a part of the stirring chamber. 前記現像室スクリューの中心軸を水平とした場合、前記攪拌室スクリューの中心軸は攪拌室スクリューが回転した時その螺旋面が進む方向へ上昇する向きに傾斜しており、画像形成装置本体に残る前記攪拌室の一部と前記現像装置の前記攪拌室の間にはトナーシャッターが設けられていることを特徴とする請求項１又は２記載の現像装置。   When the central axis of the developing chamber screw is horizontal, the central axis of the agitating chamber screw is inclined so that the spiral surface of the agitating chamber screw moves upward when the agitating chamber screw rotates, and remains in the image forming apparatus main body. The developing device according to claim 1, wherein a toner shutter is provided between a part of the stirring chamber and the stirring chamber of the developing device.
JP2005032901A 2005-02-09 2005-02-09 Developing device Withdrawn JP2006220817A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010243801A (en) * 2009-04-07 2010-10-28 Konica Minolta Business Technologies Inc Developing device and image forming apparatus
JP2016176997A (en) * 2015-03-18 2016-10-06 富士ゼロックス株式会社 Development device and image formation apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010243801A (en) * 2009-04-07 2010-10-28 Konica Minolta Business Technologies Inc Developing device and image forming apparatus
JP2016176997A (en) * 2015-03-18 2016-10-06 富士ゼロックス株式会社 Development device and image formation apparatus

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