JPH01179966A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPH01179966A JPH01179966A JP63003538A JP353888A JPH01179966A JP H01179966 A JPH01179966 A JP H01179966A JP 63003538 A JP63003538 A JP 63003538A JP 353888 A JP353888 A JP 353888A JP H01179966 A JPH01179966 A JP H01179966A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- toner
- time
- concentration
- developing
- 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.)
- Pending
Links
- 230000032258 transport Effects 0.000 claims description 8
- 239000006249 magnetic particle Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000013019 agitation Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Landscapes
- Dry Development In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
イ、発明の目的
〔産業上の利用分野〕
この発明は電子写真装置等の画像形成装置に装備するた
めの現像装置に関し、特に、二成分系現像剤を使用し、
常に正確に現像剤濃度を制御することができる改良され
た現像装置に関するものである。Detailed Description of the Invention A. Object of the Invention [Industrial Application Field] The present invention relates to a developing device to be installed in an image forming apparatus such as an electrophotographic device, and in particular, uses a two-component developer,
The present invention relates to an improved developing device that can always accurately control developer concentration.
磁性粒子とトナー粒子との混合体から成る二成分系現像
剤を使用する現像装置では、現像操作の度毎に該現像剤
中のトナー粒子が消費されて磁性粒子（すなわちキャリ
ア）のみが残留するので、現像剤濃度は現像操作の度毎
に低下する。In a developing device that uses a two-component developer consisting of a mixture of magnetic particles and toner particles, the toner particles in the developer are consumed every time a developing operation is performed, leaving only the magnetic particles (i.e., carrier). Therefore, the developer concentration decreases each time a developing operation is performed.
従って、上記現像剤濃度を常に一定値に保つためには、
使用中の現像剤濃度を常に正確に検出し、その検出結果
に応じて現像部こ内にトナーを補給しなければならない
。Therefore, in order to always keep the developer concentration at a constant value,
It is necessary to always accurately detect the developer concentration during use and replenish toner into the developing section according to the detection result.
従来、一般に行われている現像剤濃度制御としては、現
像剤濃度の検知レベルが一定以下になった場合にトナー
補給し、その検知レベルが一定以Ｅになった場合にトナ
ー補給を中止することにより、現像剤濃度を一定範囲に
保つ方法がある。Conventionally, the developer concentration control that has been generally performed is to replenish toner when the detected level of the developer concentration falls below a certain level, and to stop toner replenishing when the detected level falls below a certain level. Therefore, there is a method of keeping the developer concentration within a certain range.
また、特公昭８０−２７０３０号公報に記載されている
ように、トナー補給の停止を現像剤濃度の測定値をもっ
て行うのではなく、予め定められたトナー量の補給の終
了をもって行う方法である。Further, as described in Japanese Patent Publication No. 80-27030, toner replenishment is not stopped based on the measured value of the developer concentration, but is performed upon completion of replenishment of a predetermined amount of toner.
第３図は上記の方法によるトナー補給の説明図であり、
現像剤濃度が適正値Ａから下限値Ｂに達すると、トナー
補給信号Ｓ１が発せられる。FIG. 3 is an explanatory diagram of toner replenishment by the above method,
When the developer concentration reaches the lower limit value B from the appropriate value A, a toner replenishment signal S1 is generated.
このトナー補給信号Ｓｌに基づき、一定量のトナーが現
像剤中に補給される。この補給されるトナー量は予め、
現像剤の量を制御範囲１２から計算される０例えば、２
Ｋｇの現像剤で制Ｗ範囲を ２．０±０．２ｗｔ％とし
たい場合、トナー潤度が １．８％になったときトナー
の補給を始め２ＫｇＸ０．４ｗｔ％すなわち８ｇのトナ
ーを補給すれば、制Ｏ１範囲内に入ることになる。Based on this toner replenishment signal Sl, a certain amount of toner is replenished into the developer. The amount of toner to be replenished is determined in advance.
The amount of developer calculated from the control range 12 is 0, for example, 2
If you want to set the control W range to 2.0±0.2wt% with Kg of developer, start replenishing toner when the toner moisture level reaches 1.8%, and replenish 2Kg x 0.4wt%, or 8g of toner. , it will fall within the control O1 range.
また、オーバーシュートを起さないようにする−ために
、トナー補給信号Ｓ１が出された直後からトナー補給が
完了するまでの時間、すなわち、ｔ２時間の間、このト
ナー補給信号Ｓ１を停［ヒさせておくという方法である
。In order to prevent overshoot from occurring, the toner replenishment signal S1 is stopped for a period of time t2 from immediately after the toner replenishment signal S1 is output until toner replenishment is completed. The method is to leave it alone.
（発明が解決しようとする問題点〕
従来の現像装置は以上のような方法で現像剤濃度の均一
化を図るように構成しているので、トナー補給が一定レ
ベル以下になり、トナー補給を開始する前者の方法では
、補給されたトナーが現像剤中に分散されて、現像剤濃
度検知部で検知されるまでには一定時間を要する。この
ため、実際の現像剤濃度が上限値を越えているにもかか
わらず、そのトナー濃度が検知されず、トナー補給を続
けてオーバーシュートと呼ばれる現象が生じかぶりの原
因となる。(Problems to be Solved by the Invention) Conventional developing devices are configured to equalize developer concentration using the method described above, so when toner replenishment falls below a certain level, toner replenishment starts. In the former method, it takes a certain amount of time for the replenished toner to be dispersed in the developer and detected by the developer concentration detection section.For this reason, there is a possibility that the actual developer concentration may exceed the upper limit. Despite this, the toner density is not detected and toner replenishment continues, causing a phenomenon called overshoot, which causes fogging.
また、予め定められたトナー量の補給の終了をもって行
う後者の方法では、トナー補給量が現像装置に入ってい
る現像剤量で計算されている。しかし、現像される画像
はバラツキがあるため、トナー消費される現像剤は部分
的であり、これを均−Ｃ度の現像剤にするには撹拌等に
より一定時間を要する。Furthermore, in the latter method, which is performed upon completion of replenishment of a predetermined amount of toner, the amount of toner replenishment is calculated based on the amount of developer contained in the developing device. However, since there are variations in the developed image, the toner is only partially consumed by the developer, and it takes a certain amount of time for stirring or the like to turn the developer into a developer with a uniform degree of -C.
そこで、現像剤濃度を測定した現像剤量は部分的であり
、装置全体の現像剤量とは一致しないという問題点があ
る。また、補給したトナー量は装置全体の現像剤量に対
して常に上限値Ｃ（第３図）を越してしまい、かぶりの
原因となるなどの問題点があった。Therefore, there is a problem in that the amount of developer determined by measuring the developer concentration is only partial and does not match the amount of developer in the entire device. Further, the amount of toner replenished always exceeds the upper limit value C (FIG. 3) with respect to the amount of developer in the entire apparatus, causing problems such as fogging.
この発明は上記のような問題点を解消するためになされ
たものであり、現像剤濃度を正確に制御する現像装置を
得ることを目的とする。This invention was made to solve the above-mentioned problems, and it is an object of the present invention to provide a developing device that accurately controls developer concentration.
口、発明の構成
〔問題点を解決するための手段〕
本発明は、トナー粒子と磁性粒子とからなる現像剤を収
容する現像剤容器と、静電潜像担持体と対向して現像部
を形成するとともに前記現像剤容器から現像剤を該現像
部に担持搬送する現像剤担持部材と、前記現像剤担持部
材の回転方向で現像部の上流に位置し該現像剤担持部材
表面から離間している規制部先端を有する現像剤規制部
材と、前記現像剤相持部材で搬送された現像剤を前記現
像部下波で受取り該現像剤を前記現像剤担持部材上の長
手方向に混合・搬送する第１搬送撹拌部材と、補給され
たトナーと前記現像剤を混合させて前記方向と反対方向
に搬送させる第２搬送撹拌部材とを有する現像装置にお
いて、現像剤濃度検出器によってトナー濃度を測定され
た現像剤と補給されたトナーとが合流する位置を合流点
とし、現像剤が前記現像剤濃度検出器の位置から合流点
まで移動する時間と該現像剤濃度検出器からのトナー補
給信号に基づいて補給されたトナーが該合流点まで移動
する時間とをほぼ等しく構成したことを特徴とする現像
装置である。Summary: Structure of the Invention [Means for Solving Problems] The present invention provides a developer container containing a developer made of toner particles and magnetic particles, and a developing section facing an electrostatic latent image carrier. a developer carrying member that carries and transports the developer from the developer container to the developing section; and a developer carrying member located upstream of the developing section in the rotational direction of the developer carrying member and spaced apart from the surface of the developer carrying member. a developer regulating member having a regulating portion distal end thereof; and a first member configured to receive the developer conveyed by the developer carrying member in the downstream side of the developing device, and mix and convey the developer in the longitudinal direction on the developer carrying member. In a developing device having a conveyance agitation member and a second conveyance agitation member that mixes replenished toner and the developer and conveys the mixture in a direction opposite to the aforementioned direction, the toner concentration is measured by a developer concentration detector. The position where the developer and the replenished toner meet is defined as the confluence point, and replenishment is performed based on the time taken for the developer to move from the position of the developer concentration detector to the confluence point and the toner replenishment signal from the developer concentration detector. The developing device is characterized in that the time taken for the toner to travel to the confluence point is approximately equal.
この発明における現像装置は現像剤濃度検出器によって
現像剤濃度が測定された現像剤とトナー補給されたトナ
ーとの合流する位置を合流点とし、上記現像剤濃度検出
器の位置から合流点まで現像剤が移動する時間と該現像
剤濃度検出器からのトナー補給信号に基づいて補給され
たトナーが合流点に到達する時間をほぼ等しくしたこと
により、現像剤濃度を正確に制御することができる。The developing device according to the present invention has a merging point at a location where the developer whose developer concentration has been measured by the developer concentration detector and the toner that has been replenished is a merging point, and develops from the location of the developer concentration detector to the merging point. By making the time for the developer to move and the time for the toner replenished based on the toner replenishment signal from the developer concentration detector to reach the confluence point to be approximately equal, the developer concentration can be accurately controlled.
以下、この発明の実施例を図面について説明する。第１
図はこの発明の一実施例による現像装置の横断面図を示
し、図において、１１は表面に静′１！潜像を形成する
感光ドラム、１２はその静電潜像を現像（可視化）する
現像装置である。Embodiments of the present invention will be described below with reference to the drawings. 1st
The figure shows a cross-sectional view of a developing device according to an embodiment of the present invention. A photosensitive drum 12 forms a latent image, and a developing device 12 develops (visualizes) the electrostatic latent image.
上記の現像装置１２は、現像剤を循環させる現像剤容器
１３、矢示方向に回転自在に支持された現像剤保持部材
である円筒型の現像スリーブ１４、現像スリーブ１４に
内包された磁界発生手段である固定マグネットローラ１
５、感光ドラム１１と近接または接触する現像部に搬送
する現像剤の量を規制するドクターブレード１６、現像
スリーブ長手方向の手前側から奥側に搬送する送りスク
リュー１７、現像剤を奥側から手前側に搬送する戻りス
クリュー１８、現像剤容器１３内の現像剤を搬送させる
偏位板１９、現像剤濃度を検出する現像剤濃度検出器２
０、現像スリーブ１３に現像バイアスを印加する電源で
ある現像バイアス電源２１、送りスクリュー１７と戻り
スクリュー１８を隔離する中央隔壁２５、補給用トナー
をたくわえているホッパ２２、ホッパ２２からトナー補
給する補給用スクリュー２３と補給用モータ２４、補給
用トナーが送りスクリュー１７に入る人口であるトナー
補給口２６とで構成されている。The above-mentioned developing device 12 includes a developer container 13 that circulates developer, a cylindrical developing sleeve 14 that is a developer holding member rotatably supported in the direction of the arrow, and a magnetic field generating means included in the developing sleeve 14. Fixed magnetic roller 1 which is
5. A doctor blade 16 that regulates the amount of developer conveyed to the developing section that is close to or in contact with the photosensitive drum 11; A feed screw 17 that conveys the developer from the front side to the back side in the longitudinal direction of the developing sleeve; A return screw 18 that transports the developer to the side, a deflection plate 19 that transports the developer in the developer container 13, and a developer concentration detector 2 that detects the developer concentration.
0, a developing bias power source 21 that is a power source that applies a developing bias to the developing sleeve 13, a central partition wall 25 that separates the feed screw 17 and the return screw 18, a hopper 22 that stores toner for replenishment, and a replenishment device that replenishes toner from the hopper 22. It is composed of a toner supply screw 23, a replenishment motor 24, and a toner replenishment port 26 through which replenishment toner enters the feed screw 17.
次に以上のように構成された現像装置１２内の現像剤の
流れを第１図によって説明する。現像剤容器１３内の現
像剤は現像スリーブ１４を回転すると、現像剤容器１３
の下部から現像スリーブ１４の表面に沿った方向に上昇
してドクターブレード１６の近傍に至る。Next, the flow of developer in the developing device 12 constructed as above will be explained with reference to FIG. When the developing sleeve 14 is rotated, the developer in the developer container 13 is removed.
The developing sleeve 14 rises from the bottom in a direction along the surface of the developing sleeve 14 to reach the vicinity of the doctor blade 16 .
そこで、一部の現像剤はドクターブレード１６を通過し
て現像部に搬送されるが残部はドクターブレード１６に
沿って上昇し、現像剤容器１３の土壁にあたり、反転し
て現像剤の上昇経路の外側を重力によって下降する。Therefore, a part of the developer passes through the doctor blade 16 and is transported to the developing section, but the remaining part rises along the doctor blade 16, hits the earthen wall of the developer container 13, and is turned around to take the upward path of the developer. descends by gravity on the outside of the
現像剤は下降途中に偏位板１９にガイドされて現像剤容
器１３の下部に至り、再び現像スリーブ１４の近傍を上
昇して、上記の動作を繰返す。During its descent, the developer is guided by the deflection plate 19 and reaches the lower part of the developer container 13, and then rises again near the developing sleeve 14 and repeats the above operation.
また、現像部に搬送された現像剤は一部のトナーが感光
ドラム１１の静電潜像の現像に消費され、消費されなか
った現像剤は固定マグネットローラ１５の反発極によっ
て戻りスクリュー１８上に落下され、この戻りスクリュ
ー１８で撹拌・搬送されながら現像剤容器１３内に戻る
。Further, part of the toner of the developer conveyed to the developing section is consumed for developing the electrostatic latent image on the photosensitive drum 11, and the unconsumed developer is returned onto the screw 18 by the repulsion pole of the fixed magnet roller 15. The developer is dropped and returned to the developer container 13 while being stirred and conveyed by the return screw 18 .
上記は現像剤の流れを、現像装置１２の断面的に説明し
たが、これを現像スリーブ１４の長手方向に対しての現
像剤の流れを模式的に示したのが第２図である。Although the flow of the developer has been explained above in terms of a cross section of the developing device 12, FIG. 2 schematically shows the flow of the developer in the longitudinal direction of the developing sleeve 14.
現像装置１２は中央隔壁２５によってＡ領域とＢ’Ｗ域
に区分されている。Ａ領域は現像スリーブ１４側であり
、偏位板１９と戻りスクリュー１８によって搬送される
現像剤の流れを示している。The developing device 12 is divided into an area A and an area B'W by a central partition wall 25. Area A is on the side of the developing sleeve 14 and shows the flow of the developer transported by the deflection plate 19 and the return screw 18.
また、Ｂ領域は送りスクリュー１７によって搬送される
現像剤の流れを示している。Furthermore, region B shows the flow of the developer conveyed by the feed screw 17.
Ｂ領域では、装置手間側でトナー補給されたトナーが、
現像剤とともに撹拌されながら搬送スピードｖ２で奥側
に搬送され、搬送される現像剤の断面積はＳ２で表わさ
れる。In area B, the toner replenished by the machine labor side is
The developer is conveyed to the back side at a conveyance speed v2 while being stirred together with the developer, and the cross-sectional area of the conveyed developer is represented by S2.
そして、Ｂ領域の装置奥側に搬送された現像剤はＡ領域
に受は渡されて、この現像剤は装置奥側から手前側に向
って搬送される。Ａ領域では搬送スピードｖ１で搬送さ
れ、搬送される現像剤の断面積Ｓ１で表わされる。The developer transported to the back side of the apparatus in area B is transferred to area A, and this developer is transported from the back side of the apparatus toward the front side. In area A, the developer is transported at a transport speed v1, and is represented by a cross-sectional area S1 of the developer being transported.
Ｌ記Ａ領域とＢ領域は閉ざされた現像剤搬送系になって
おり、現像剤の流れを平衡に保つように構成されている
ので、単位時間の現像剤の搬送量Ｖ （ｇ／５ｅｃ）
、現り剤の密度ρとすると、Ｖ＝ｖｌ・Ｓ＋／ρ＝ｖ２
・Ｓ２／ｐで表わされる。Areas A and B of L are closed developer transport systems and are configured to keep the developer flow in equilibrium, so the developer transport amount per unit time is V (g/5ec).
, the density of the developer is ρ, then V=vl・S+/ρ=v2
- Represented by S2/p.
一方、現像剤濃度検出器２０はＡ領域でトナー消費され
た現像剤が搬送される最終点近傍に設置されており、こ
の現像剤濃度検出器２０から出力された現像剤濃度検出
信号とリファレンス信号とが、差動増幅器等を内蔵した
制御回路２５に印加されると、この制御回路によって補
給モータ２４に対して出力信号が供給される。On the other hand, the developer concentration detector 20 is installed near the final point where the developer whose toner has been consumed in area A is conveyed, and the developer concentration detection signal and reference signal outputted from the developer concentration detector 20 are When this is applied to a control circuit 25 that includes a differential amplifier or the like, an output signal is supplied to the replenishment motor 24 by this control circuit.
前記の現像剤濃度検出器２０は現像装置動作中に一定時
間間隔で現像剤濃度測定を行い、その測定値が予め定め
られた基準濃度値に達するようにトナー量を補給し、そ
の補給量は測定間隔で分割された現像剤量に対してのト
ナー量を補給する。The developer concentration detector 20 measures the developer concentration at regular intervals during the operation of the developing device, and replenishes the amount of toner so that the measured value reaches a predetermined reference concentration value. The amount of toner is replenished for the amount of developer divided at measurement intervals.
たとえば現像剤濃度検出器２０の測定間隔Δ十ｓｅｃ
とすると、上記より現像剤の搬送量Δｔ−Ｖとなる。そ
こで、現像剤検出器２０による測定値が基準濃度値より
Δｘｗｔ％減少した場合は、トとなり、Δｔ ｓｅｅ間
にトナーＭｙを補給すれば、現像剤量Δｔ−Ｖの現像剤
濃度は基準源、廉価となる。For example, the measurement interval of the developer concentration detector 20 is Δ10 seconds.
Then, from the above, the conveyance amount of the developer becomes Δt-V. Therefore, if the measured value by the developer detector 20 decreases by Δxwt% from the reference density value, then the result is G, and if the toner My is replenished during Δtsee, the developer concentration of the developer amount Δt-V will be equal to that of the reference source. Becomes inexpensive.
この発明は測定間隔によって分割された現像剤が現像剤
濃度検出器２０から補給されたトナーと合流するＣ位置
まで移動する時間を１．とし、また前記現像剤量に対し
て補給するトナーがトナー補給口２６より送りスクリュ
ー１７上に落下し、この送りスクリュー１７によってＣ
位置に搬送される時間をｔ２とし、また、濃度検出器２
ｏによって測定された出力信号が制御回路２５に供給さ
れ、この制御回路２５で補給モータ２４を回転させる時
間をｔ３とすると、上記トナー濃度を測定された時間か
ら、分割された現像剤がＣ位置に移動する時間ｔ１と補
給されるトナーがＣ位置に移動する時間ｔ２＋ｔ３とを
ほぼ等しくすることで正確な現像剤濃度制御をすること
ができる。In this invention, the time required for the developer divided by the measurement interval to move from the developer concentration detector 20 to position C where it joins the supplied toner is 1. In addition, the toner to be replenished for the amount of developer falls from the toner replenishment port 26 onto the feed screw 17, and the feed screw 17
The time for transporting to the position is t2, and the concentration detector 2
If the output signal measured by o is supplied to the control circuit 25, and the time during which the replenishment motor 24 is rotated by this control circuit 25 is t3, the divided developer is at position C from the time when the toner concentration is measured. By making the time t1 for the toner to move to the C position approximately equal to the time t2+t3 for the replenished toner to move to the C position, accurate developer concentration control can be performed.
すなわち分割された現像剤に対してのトナー量を補給す
るので、合流位置であるＣ位置に到達する現像剤と補給
されるトナーが時間的に合っていないと測定間隔で分割
された現像剤量と補給されるトナー量が一致しなくなり
、正確な現像剤濃度制御をすることができなくなる。In other words, since the amount of toner is replenished for the divided developer, if the developer that reaches position C, which is the merging position, and the toner that is replenished do not match in time, the amount of developer divided at the measurement interval will be changed. The amount of toner replenished will no longer match, making it impossible to accurately control the developer concentration.
しかし、多少の時間的ズレは送りスクリュー１７によっ
て分割された現像剤が搬送される時に前後に混合される
ので問題がない。However, a slight time lag is not a problem because the developer divided by the feed screw 17 is mixed back and forth when it is conveyed.
また、構成上１１＞１２＋１３になる場合は前記時間ｔ
３を遅らせて、はぼｔ１申１．、＋１３にすることがで
き、また１、＜１２＋１３になる場合は前記時間ｔ３を
早めることでほぼ１．：１２＋ｔ３にすることができる
。In addition, if 11>12+13 due to the configuration, the time t
Delay 3, Habo t1 and 1. , +13, and if 1.<12+13, the time t3 can be advanced to approximately 1. :12+t3.
ハ、発明の詳細
な説明したように、この発明によれば、送りスクリュー
と戻りスクリューとで現像スリーブの長平方向に現像剤
が循環されている現像装置において、現像剤濃度検出器
によって測定された現像剤とトナー補給されたトナーと
の合流する位置までの時間をほぼ等しくなるように構成
したので、現像剤中のトナー濃度を正確に制御すること
ができる。C. Detailed Description of the Invention According to the present invention, in the developing device in which the developer is circulated in the longitudinal direction of the developing sleeve by the feed screw and the return screw, the developer concentration is measured by the developer concentration detector. Since the time required for the developer and the replenished toner to meet at the point where they meet is approximately equal, the toner concentration in the developer can be accurately controlled.
第１図はこの発明の実施による現像装置を示す横断面図
、第２図はこの現像装置内の現像剤の流れを示す模式図
、第３図は従来の現像装置におけるトナーの補給説明図
である。
１１：感光ドラム（静電潜像担持体）、１２：現像装置
、１３：現像剤容器、１４：現像スリーブ（現像剤担持
部材）、１６：ドクターブレード、１７：送りスクリュ
ー（第１搬送撹拌部材）、１８：戻りスクリュー（第２
搬送撹拌部材）、２０・現像剤濃度検出器。FIG. 1 is a cross-sectional view showing a developing device according to the present invention, FIG. 2 is a schematic diagram showing the flow of developer in this developing device, and FIG. 3 is an explanatory diagram of toner replenishment in a conventional developing device. be. 11: Photosensitive drum (electrostatic latent image carrier), 12: Developing device, 13: Developer container, 14: Developing sleeve (developer carrying member), 16: Doctor blade, 17: Feeding screw (first conveyance stirring member) ), 18: Return screw (second
(conveyance stirring member), 20・Developer concentration detector.
Claims (1)
現像剤容器と、静電潜像担持体と対向して現像部を形成
するとともに前記現像剤容器から現像剤を該現像部に担
持搬送する現像剤担持部材と、前記現像剤担持部材の回
転方向で現像部の上流に位置し該現像剤担持部材表面か
ら離間している規制部先端を有する現像剤規制部材と、
前記現像剤担持部材で搬送された現像剤を前記現像部下
流で受取り該現像剤を前記現像剤担持部材上の長手方向
に混合・搬送する第１搬送撹拌部材と、補給されたトナ
ーと前記現像剤を混合させて前記方向と反対方向に搬送
させる第２搬送攪拌部材とを有する現像装置において、
現像剤濃度検出器によってトナー濃度を測定された現像
剤と補給されたトナーとが合流する位置を合流点とし、
現像剤が前記現像剤濃度検出器の位置から合流点まで移
動する時間と該現像剤濃度検出器からのトナー補給信号
に基づいて補給されたトナーが該合流点まで移動する時
間とをほぼ等しく構成したことを特徴とする現像装置。1. A developer container containing a developer made of toner particles and magnetic particles and a developing section facing the electrostatic latent image carrier, and carrying and conveying the developer from the developer container to the developing section. a developer carrying member; a developer regulating member having a regulating portion distal end located upstream of a developing section in the rotational direction of the developer carrying member and spaced apart from a surface of the developer carrying member;
a first conveying and agitating member that receives the developer conveyed by the developer carrying member downstream of the developing section, mixes and conveys the developer in a longitudinal direction on the developer carrying member; A developing device including a second transport stirring member that mixes the agent and transports the agent in a direction opposite to the above direction,
The location where the developer whose toner concentration is measured by the developer concentration detector and the supplied toner meet is defined as the confluence point,
The time required for the developer to move from the position of the developer concentration detector to the merging point is approximately equal to the time required for the toner replenished based on the toner replenishment signal from the developer concentration detector to move to the merging point. A developing device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63003538A JPH01179966A (en) | 1988-01-11 | 1988-01-11 | Developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63003538A JPH01179966A (en) | 1988-01-11 | 1988-01-11 | Developing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01179966A true JPH01179966A (en) | 1989-07-18 |
Family
ID=11560184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63003538A Pending JPH01179966A (en) | 1988-01-11 | 1988-01-11 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01179966A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05127522A (en) * | 1991-11-05 | 1993-05-25 | Mita Ind Co Ltd | Toner supplying device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62226172A (en) * | 1986-03-27 | 1987-10-05 | Minolta Camera Co Ltd | Electrostatic latent image developing device |
-
1988
- 1988-01-11 JP JP63003538A patent/JPH01179966A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62226172A (en) * | 1986-03-27 | 1987-10-05 | Minolta Camera Co Ltd | Electrostatic latent image developing device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05127522A (en) * | 1991-11-05 | 1993-05-25 | Mita Ind Co Ltd | Toner supplying device |
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