JPH0395575A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPH0395575A JPH0395575A JP23256489A JP23256489A JPH0395575A JP H0395575 A JPH0395575 A JP H0395575A JP 23256489 A JP23256489 A JP 23256489A JP 23256489 A JP23256489 A JP 23256489A JP H0395575 A JPH0395575 A JP H0395575A
- Authority
- JP
- Japan
- Prior art keywords
- conveyance path
- toner
- developer
- conveyance
- developing device
- 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
- 238000001514 detection method Methods 0.000 claims abstract description 17
- 238000005192 partition Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 108091008695 photoreceptors Proteins 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 235000013365 dairy product Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
- G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
- G03G15/0849—Detection or control means for the developer concentration
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
- G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
- G03G15/0849—Detection or control means for the developer concentration
- G03G15/0853—Detection or control means for the developer concentration the concentration being measured by magnetic means
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
- G03G15/0887—Arrangements for conveying and conditioning developer in the developing unit, e.g. agitating, removing impurities or humidity
- G03G15/0891—Arrangements for conveying and conditioning developer in the developing unit, e.g. agitating, removing impurities or humidity for conveying or circulating developer, e.g. augers
- G03G15/0893—Arrangements for conveying and conditioning developer in the developing unit, e.g. agitating, removing impurities or humidity for conveying or circulating developer, e.g. augers in a closed loop within the sump of the developing device
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/08—Details of powder developing device not concerning the development directly
- G03G2215/0802—Arrangements for agitating or circulating developer material
- G03G2215/0816—Agitator type
- G03G2215/0819—Agitator type two or more agitators
- G03G2215/0822—Agitator type two or more agitators with wall or blade between agitators
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dry Development In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業」二の利用分野〕
本発明は、電子写真法による複写機、プリンタ等の現像
装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Application in Industry] The present invention relates to a developing device for a copying machine, a printer, etc. using electrophotography.
従来、前記現像装置として、現像スリーブを備えた現像
部の後方に順次第■搬送路、第２搬送路、第３搬送路を
並列に配置し、これら搬送路で現像剤を循環しながら搬
送するようにしたものか提案されており、この棟の現像
装置では、第２搬送路の現像剤搬送方向上流側にトナー
補給口を設けるとともに、該トナー補給口の下流側に１
・ナー濃度検出手段を設けていた。Conventionally, as the developing device, a transport path, a second transport path, and a third transport path are sequentially arranged in parallel behind a developing section equipped with a developing sleeve, and the developer is transported while being circulated through these transport paths. In the developing device of this building, a toner replenishment port is provided on the upstream side of the second transport path in the developer transport direction, and a toner replenishment port is provided on the downstream side of the toner replenishment port.
・Equipped with a concentration detection means.
しかしながら、前記現像装置では第２搬送路で供給され
たトナーが現像剤と十分混合されていない状態で、また
必要な値まで荷電されていない状態で第１搬送路に搬入
され、そして現像に供されることがあり、画像」二にか
ぶりか現れたり、粉煙が外部に漏れて周辺機器を汚染す
るという問題点を有していた。However, in the developing device, the toner supplied through the second conveyance path is conveyed to the first conveyance path in a state where it is not sufficiently mixed with the developer and is not charged to a required value, and is then subjected to development. There were problems in that the image could be overcast, and powder smoke could leak outside and contaminate peripheral equipment.
本発明は、前記問題点を解決するためになされたもので
、現像部の背後に第１搬送路、第２搬送路、第３搬送路
を並列に設け、これら搬送路で現像剤を循環しながら搬
送する現像装置において、前記第１搬送路の現像剤搬送
方向下流側又は第２搬送路にトナー濃度検出手段を設け
、該１・ナー濃度検出手段の検出結果に基ついて、前記
第３搬送路にトナーを補給するようにしたものである。The present invention was made in order to solve the above-mentioned problem, and a first conveyance path, a second conveyance path, and a third conveyance path are provided in parallel behind the developing section, and the developer is circulated through these conveyance paths. In the developing device, a toner concentration detection means is provided on the downstream side of the first conveyance path in the developer conveyance direction or on the second conveyance path, and based on the detection result of the toner concentration detection means, the third conveyance The system is designed to replenish toner on the road.
以上の構或により、本発明の現像装置では、トナー濃度
検出手段からの検出信号に基ついてｌ・ナー濃度の低下
が検出されると、第３搬送路にトナーが補給される。With the above structure, in the developing device of the present invention, toner is replenished to the third conveyance path when a decrease in the l.toner concentration is detected based on the detection signal from the toner concentration detection means.
補給されたトナーは、第３搬送路を搬送されている現像
剤の混入され、現像剤に分散した状態で第２搬送路に送
り込まれる。また、１・ナーは第２搬送路に搬入される
と、ざるにそこで現像剤と混合されつつ搬送され、現像
剤に均一に分散し、所要の電荷が付与された状態で第１
搬送路に送り込まれて現像に供される。The replenished toner is mixed with the developer being conveyed through the third conveyance path, and is sent to the second conveyance path in a dispersed state in the developer. In addition, when the 1-toner is carried into the second conveyance path, it is conveyed while being mixed with the developer in a colander, and is uniformly dispersed in the developer, and the first toner is imparted with the required charge.
It is sent into a conveyance path and subjected to development.
以下、添付図面を参照して本発明の実施例について説明
する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
第１〜５図において、現像装置１のノ＼ウジングはケー
ンング２とカバー３とで構戊され、前部に現像部４が設
けてある。In FIGS. 1 to 5, a developing device 1 has a nozzle consisting of a caning 2 and a cover 3, and a developing section 4 is provided at the front.
３
］．４．，１５にそれぞれ矢印ｂ， ｃ， ｄ方向
に回転駆動可能に配置されており、搬送路１３，１４．
１５に収容される現像剤をそれそれ矢印Ｘ，，Ｘ，Ｘ８
方向に搬送するようにしてある。3]. 4. , 15 so as to be rotatably driven in the directions of arrows b, c, and d, respectively, and the transport paths 13, 14 .
The developer stored in 15 is indicated by arrows X, , X, X8.
It is designed to be transported in the direction.
トナー補給管２０は１・ナーホッパ（図示せず）に接統
されており、落下イ具給１コ２１が第３搬送路１５に位
置させてある。１・ナー袖給管２０の中にはスクリュウ
２２が設けてあり、このスクリュウ２２は１・ナー補給
モータＭ，で回転駆動するようにしてある。The toner supply pipe 20 is connected to a toner hopper (not shown), and a dropper feeder 21 is located on the third conveyance path 15. A screw 22 is provided in the 1.ner sleeve supply pipe 20, and the screw 22 is rotationally driven by a 1.ner supply motor M.
１・ナー濃度検出センサ（以下、「センサ」という。）
ＡＴは現像剤のインタクタンスを測定するもので１第１
搬送路１３の手前側端部の底部に設けてある。1. Toner concentration detection sensor (hereinafter referred to as "sensor")
AT measures the intactance of the developer.
It is provided at the bottom of the front end of the conveyance path 13.
以上の構戊において、搬送路１．３， １４．，
１５にはトナーとキャリアを混合した現像剤か収容され
る。In the above structure, the conveyance paths 1.3, 14. ，
15 contains a developer containing a mixture of toner and carrier.
第３搬送路１５の現像剤は、第３スクリ一ウ１８で矢印
Ｘ。方向に搬送され、第４通路１２を通じて矢印Ｘ．，
方向に｝台って第２搬送路１４の手現像部４には、円筒
状の現像スｌ）一ブ５が矢印ａ方向に回転駆動可能に設
けてあり、内部に磁松（Ｎ＋，Ｓｌ，Ｎ２＋ ＮＧ＋
ｓｔ）を軸方向に延設した磁石休６が回転不可能に固
定］７てある。The developer in the third conveyance path 15 is moved by the arrow X in the third screen 18. is conveyed in the direction of arrow X. through the fourth passage 12. ，
In the manual developing section 4 of the second conveyance path 14, a cylindrical developing sleeve 5 is provided so as to be rotatable in the direction of the arrow a. ,N2+ NG+
A magnet 6 extending in the axial direction is fixed in a non-rotatable manner.
現像部４の後方には、ケーシング２の底部を」二方に延
設して第１仕切壁７、第２仕切壁８が設けてあり、これ
ら仕切壁７，８を挾むようにして第１搬送路１３，第２
搬送路１４，第３搬送路１５が順次後方に形或してある
。第１搬送路１３と第３搬送路１５の底部は現像スリー
ブ５と平行にしてあり、第２搬送路１４の底部は−・端
側（第ｊ図に示す手前側）で搬送路１３．１５よりも低
く、他端側（第１図に示す奥側）で搬送路１３．１．５
よりも高くなるように傾斜させてある。また、第１仕切
壁７はその奥側、手前側の端部を切除して第１通路９，
第２通路ｌ１がそれぞれ形成され、第２仕切壁８もその
奥側、手前側の端部を切除して第３通路１０，第４通路
１２かそれそれ形成されている。At the rear of the developing section 4, a first partition wall 7 and a second partition wall 8 are provided extending in two directions from the bottom of the casing 2, and a first conveyance path is formed between these partition walls 7 and 8. 13, 2nd
A conveyance path 14 and a third conveyance path 15 are formed in sequence at the rear. The bottoms of the first conveyance path 13 and the third conveyance path 15 are parallel to the developing sleeve 5, and the bottom of the second conveyance path 14 is parallel to the conveyance path 13. transport path 13.1.5 at the other end (back side shown in Figure 1).
It is tilted so that it is higher than the In addition, the first partition wall 7 has its rear and front ends cut out to form a first passage 9,
A second passage l1 is formed respectively, and a third passage 10, a fourth passage 12, etc. are formed by cutting off the rear and front ends of the second partition wall 8, respectively.
スクリュウ１６． １７， １．８は、搬送酪１３
４
前側に送り込まれる。Screw 16. 17, 1.8 is transportation dairy 13
4 It is sent to the front side.
第２搬送路］．４の現像剤は、第２スクリュウ１７で矢
印Ｘ４方向に搬送され、第１通路９、第３通路１０を通
じてそれそれ矢印Ｘ５，Ｘ６方向に沿って第１搬送路１
３，第３搬送路１５に分配される。2nd conveyance path]. The developer No. 4 is conveyed in the direction of arrow X4 by the second screw 17, and is transferred to the first conveyance path 1 along the directions of arrows X5 and X6 through the first passage 9 and the third passage 10, respectively.
3, distributed to the third conveyance path 15.
第１搬送路１３の現像剤は、第１スクリュウ１６で矢印
Ｘ，方向に搬送され、手前側の通路１１を通じて矢印Ｘ
３方向から第２搬送路１４に送り込まれる。また、第１
搬送路１３の現像剤は矢印Ｘ，方向に搬送されながら現
像スリーブ５に供給される。The developer in the first conveyance path 13 is conveyed by the first screw 16 in the direction of the arrow
It is fed into the second conveyance path 14 from three directions. Also, the first
The developer in the conveyance path 13 is supplied to the developing sleeve 5 while being conveyed in the direction of arrow X.
現像スリーブ５に供給された現像剤は、磁石体６の磁力
に基ついて現像スリーブ５の外周部に保持されながら現
像スリーブ５の回転とともに矢印ａ方向（第２． ３
（ａ）図では矢印Ｘ，で示ず。）に搬送され、穂高規制
部材ｊ９で搬送量か規制されながら現像領域Ｐに搬送さ
れる。現像領域Ｐに搬送された現像剤は、矢印ｅ方向に
回転する感光体１００の外周面に接触し、そこに静電潜
像が形成されていればこれに対して１・ナーを供給する
。The developer supplied to the developing sleeve 5 is held on the outer periphery of the developing sleeve 5 by the magnetic force of the magnet body 6, and as the developing sleeve 5 rotates, it moves in the direction of arrow a (second and third
(a) Not indicated by an arrow X in the figure. ), and is transported to the development area P while the amount of transport is regulated by the height regulating member j9. The developer conveyed to the development area P contacts the outer circumferential surface of the photoreceptor 100 rotating in the direction of arrow e, and if an electrostatic latent image is formed thereon, 1.toner is supplied to the electrostatic latent image.
現像領域Ｐを通過した現像剤は、現像ス１ノ一７５の回
転と共に矢印ａ方向（第３（ａ）図では矢印Ｘ，で示す
。）に搬送され、磁石体６において同極の磁極Ｎ２，Ｎ
３が隣接ずる領域の対向部で現像スリーブ５の外周部か
ら離脱し、第１搬送路１３を搬送されている現像剤に混
入される。The developer that has passed through the developing area P is conveyed in the direction of arrow a (indicated by arrow X in FIG. 3(a)) as the developing slot 1 no. ,N
3 separates from the outer peripheral portion of the developing sleeve 5 at the opposing portion of the adjacent region, and is mixed into the developer being conveyed through the first conveyance path 13 .
次に、トナー補給制御について説明する。Next, toner supply control will be explained.
トナー濃度検出センザＡＴからの信号は制御装置ＣＰＵ
に入力され、その電圧値よりセンサＡＴの設置位置にお
ける現像剤のトナー濃度が検出される。The signal from the toner concentration detection sensor AT is sent to the control device CPU.
The toner concentration of the developer at the installation position of the sensor AT is detected from the voltage value.
センサＡＴで検出されたトナー濃度は制御すべき目標値
（例えば６％）と比較され、！・ナー濃度の検出値が目
標値よりも低ければトナー補給モータＭが回転し、矢印
Ｘ，方向から送られてくる１・ナーが落下口２１を介し
て第３搬送路１６に供給される。The toner concentration detected by sensor AT is compared with a target value (for example, 6%) to be controlled, and! - If the detected value of the toner concentration is lower than the target value, the toner replenishment motor M rotates, and the 1.toner sent from the direction of arrow X is supplied to the third conveyance path 16 via the drop port 21.
補給された１・ナーは、第３搬送路１５を搬送中の現像
剤とともにスクリュウ１８で矢印Ｘ６方向７
と十分混合されて均−に分散し帯電しているので、現像
領域Ｐに搬送された場合にキャリアから離れて飛散した
り、感光体１００の非両像部に｛ｔ ｆ”．ｒ Ｌたり
することはないし、すべての領域で均一に静電潜像に付
着する。The replenished 1.ner is sufficiently mixed with the developer being conveyed through the third conveyance path 15 in the direction of the arrow In this case, the electrostatic latent image does not scatter away from the carrier or stick to non-image areas of the photoreceptor 100, and it adheres uniformly to the electrostatic latent image in all areas.
なお、以」二の説明では、センサＡＴは第１搬送路１３
の手前側端部に設けるものとしたが、第３（ｂ）図に示
すように、第２搬送路１４であって、現像剤搬送方向に
対して補給されたトナーか混合される領域の」二流側に
設けるようにしてもよい。In addition, in the following explanation, the sensor AT is connected to the first transport path 13.
However, as shown in FIG. 3(b), in the second conveyance path 14, in the area where the toner replenished in the developer conveyance direction is mixed. It may be provided on the second flow side.
以」二の説明で明らかなように、本発明では、現像部の
背後に第Ｉ搬送路、第２搬送路、第３搬送路を並列に設
け、これら搬送路で現像剤を循環しながら搬送する現像
装置において、前記第１搬送路の現像剤搬送方向下流側
又は第２搬送路に１・ナー濃度検出手段を設け、該トナ
ー濃度検出手段の検出結果にノλついて、前記第３搬送
路に１・ナーを補給するようにしている。As is clear from the following explanation, in the present invention, a first conveyance path, a second conveyance path, and a third conveyance path are provided in parallel behind the developing section, and the developer is conveyed while being circulated in these conveyance paths. In the developing device, a toner concentration detection means is provided on the downstream side of the first conveyance path in the developer conveyance direction or on the second conveyance path, and according to the detection result of the toner concentration detection means, the third conveyance path is detected. I try to replenish 1.ner.
したがって、新たに補給されるトナーは第３搬に搬送さ
れる。このとき、１・ナーは現像剤と混合され、ヰヤＩ
Ｊアと接触して帯電し、その荷電量を増していく。Therefore, the newly replenished toner is transported to the third transport. At this time, the 1.ner is mixed with the developer, and the 1.ner is mixed with the developer.
When it comes into contact with JA, it becomes electrically charged, and the amount of charge increases.
第３搬送路１５を手前側に搬送されたトナーは、通路１
２を介して第２搬送路１４に送り込まれ、第１搬送路■
３から送られてきた現像剤とともに、スクリュウェアの
回転に基づいて矢印Ｘ４方向に搬送され、さらに現像剤
ど混合されて分散しまた荷電量を増す。The toner conveyed to the front side through the third conveyance path 15 is transferred to the path 1
2 to the second conveyance path 14, and the first conveyance path ■
Together with the developer sent from No. 3, it is transported in the direction of arrow X4 based on the rotation of the screwware, and the developer is further mixed and dispersed, and the amount of charge is increased.
また、第２搬送路１４を搬送される際に現像剤のトナー
濃度がセンサΔＴで検出され、ｌ−ナーが不足ならば更
にトナー補給モータＭを駆動してトナーが第３搬送路｛
５に補給される。Further, the toner concentration of the developer is detected by the sensor ΔT while being transported through the second transport path 14, and if the l-toner is insufficient, the toner replenishment motor M is further driven to transfer the toner to the third transport path {
5 will be replenished.
第２搬送路１４を奥側の端部まで搬送されたトナー及び
現像剤は通路９、１０に分配され、第１搬送路１３と第
３搬送路１５に送り込まれ、第１搬送路１３に送り込ま
れた現像剤が矢印Ｘ，方向に搬送されながら現像に供さ
れることになる。ここで、補給されたトナーは、第３搬
送路１５と第２搬送路１４を搬送され、しかもその間に
現像剤８
送路に供給され、この第３搬送路と第２搬送路で現像剤
と混合され、そして均一に分散し、かつ十分に帯昂した
状態で第１搬送紹において現像にイＪ（される。The toner and developer that have been transported to the rear end of the second transport path 14 are distributed to the paths 9 and 10, sent to the first transport path 13 and the third transport path 15, and then sent to the first transport path 13. The developer is transported in the direction of arrow X and subjected to development. Here, the replenished toner is conveyed through the third conveyance path 15 and the second conveyance path 14, and in between, is supplied to the developer 8 conveyance path. The mixed materials are uniformly dispersed, and are then developed in the first conveyance in a sufficiently agitated state.
このため、トナーはキャリアと十分な結合力を有するの
で飛散することなく、保持される。また、現像領域です
べての領域にわたって均一濃度でトナーが分布している
ので、濃度むらの無い奇麗な画像が得られる。Therefore, the toner has a sufficient bonding force with the carrier and is held without scattering. Further, since the toner is distributed at a uniform density over the entire development area, a clear image without density unevenness can be obtained.
第１図は現像装置の部分切欠斜視図、第２図は現像装置
の横断面図、第３（ａ）図は現像剤の流れを示す説明図
、第３（ｂ）図は他の実施例の現像剤の流れを示す説明
図、第４図は現像装置の■−１線断面図、第５図は現像
装置の■−■線断面図である。
１・・・現像装置、５ 現像スリーブ、９，１０１１．
．＋２・・通路、１３． １．４． １５ 搬送
ｊ，！３ ，１６，］．７．１８・・・スク］ノユウ、
ＡＴ・・トナー濃度検出センサ。FIG. 1 is a partially cutaway perspective view of the developing device, FIG. 2 is a cross-sectional view of the developing device, FIG. 3(a) is an explanatory diagram showing the flow of developer, and FIG. 3(b) is another embodiment. FIG. 4 is a sectional view of the developing device taken along line 1-1, and FIG. 5 is a sectional view taken along line 2--2 of the developing device. 1... Developing device, 5 Developing sleeve, 9,1011.
．． +2...Aisle, 13. 1.4. 15 Transport j,! 3,16,]. 7.18...Sc] Noyuu,
AT: Toner concentration detection sensor.
Claims (1)
送路を並列に設け、これら搬送路で現像剤を循環しなが
ら搬送する現像装置において、前記第１搬送路の現像剤
搬送方向下流側又は第２搬送路にトナー濃度検出手段を
設け、該トナー濃度検出手段の検出結果に基づいて、前
記第３搬送路にトナーを補給するようにしたことを特徴
とする現像装置。(1) In a developing device in which a first conveyance path, a second conveyance path, and a third conveyance path are provided in parallel behind a developing section, and the developer is conveyed while being circulated in these conveyance paths, the developing device in the first conveyance path is A developing device characterized in that a toner concentration detection means is provided on the downstream side in the agent conveyance direction or on the second conveyance path, and toner is replenished to the third conveyance path based on the detection result of the toner concentration detection means. .
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23256489A JPH0395575A (en) | 1989-09-07 | 1989-09-07 | Developing device |
| DE19904028163 DE4028163A1 (en) | 1989-09-07 | 1990-09-05 | Developer unit for electrostatic copier - monitors toner conc. in feed path to developer roller to control toner topping cup |
| US07/578,255 US5122834A (en) | 1989-09-07 | 1990-09-06 | Developing apparatus for determining decreased concentration of toner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23256489A JPH0395575A (en) | 1989-09-07 | 1989-09-07 | Developing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0395575A true JPH0395575A (en) | 1991-04-19 |
Family
ID=16941315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23256489A Pending JPH0395575A (en) | 1989-09-07 | 1989-09-07 | Developing device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH0395575A (en) |
| DE (1) | DE4028163A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5582521A (en) * | 1993-12-27 | 1996-12-10 | Yazaki Corporation | Charging connector |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3577359D1 (en) * | 1985-10-14 | 1990-05-31 | Agfa Gevaert Nv | DEVICE AND METHOD FOR DIFFUSION TRANSITION DEVELOPMENT. |
| JP2576130B2 (en) * | 1987-07-02 | 1997-01-29 | ミノルタ株式会社 | Developing device |
-
1989
- 1989-09-07 JP JP23256489A patent/JPH0395575A/en active Pending
-
1990
- 1990-09-05 DE DE19904028163 patent/DE4028163A1/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5582521A (en) * | 1993-12-27 | 1996-12-10 | Yazaki Corporation | Charging connector |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4028163A1 (en) | 1991-03-21 |
| DE4028163C2 (en) | 1992-10-22 |
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