JPH0263078A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPH0263078A JPH0263078A JP63217212A JP21721288A JPH0263078A JP H0263078 A JPH0263078 A JP H0263078A JP 63217212 A JP63217212 A JP 63217212A JP 21721288 A JP21721288 A JP 21721288A JP H0263078 A JPH0263078 A JP H0263078A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- toner
- screw
- conveyed
- 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
- 238000003756 stirring Methods 0.000 claims description 8
- 230000014759 maintenance of location Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000005192 partition Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 239000006249 magnetic particle Substances 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
Landscapes
- Dry Development In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は静電像の現像装置に関するものである。[Detailed description of the invention] [Industrial application field] The present invention relates to an electrostatic image developing device.
像担持体表面に形成した静電潜像にトナーを付着させて
これを顕像化する周知の画像形成装置において、現像剤
としてトナーとキャリアとを混合したいわゆる二成分系
現像剤を使用するものが従来からひろ（実用されている
。A well-known image forming apparatus that applies toner to an electrostatic latent image formed on the surface of an image carrier and visualizes it uses a so-called two-component developer in which toner and carrier are mixed as the developer. Hiro has traditionally been used (in practical use).
このような装置においては、実際に潜像の顕像化に寄与
するのはトナーのみであるから現像剤を収納する現像装
置内の現像スリーブ等の現像剤担持部材近傍においては
、次第にトナーの量が減少して画像濃度が低下すること
を免れない。In such devices, only the toner actually contributes to the visualization of the latent image, so the amount of toner gradually decreases near the developer carrying member such as the developing sleeve in the developing device that stores the developer. This inevitably results in a decrease in image density.
したがって安定して良好な画像を得るためには、現像剤
内のトナー量を検知して適時トナーを補給すること、補
給したトナーを速やかに現像剤全体に分散させて局部的
なトナー濃度の偏倚が生じないようにするとともに、こ
の濃度を回復した現像剤を常時すみやかに濃度検知部位
に送給して誤検知を可及的に阻止することが必須である
。Therefore, in order to stably obtain good images, it is necessary to detect the amount of toner in the developer and replenish the toner in a timely manner, and to quickly disperse the replenished toner throughout the developer to prevent local toner concentration deviations. It is essential to prevent this from occurring and to always promptly feed the developer whose density has been restored to the density detection site to prevent false detection as much as possible.
また、上述の濃度の回復した現像剤は常時すみやかに現
像剤担持部材に搬送させることが必須である。しかし現
像剤担持部位とトナー補給部との間の現像剤の搬送路が
短いと、補給されたトナーが現像剤中に均一に分散され
る前に、現像剤担持部材上に搬送されてしまい、カブリ
、飛散等が生じるという問題があった。また、搬送路を
長くとリ、現像剤を撹拌する時間を長くとるような構成
とした場合、現像装置を小型化できないという問題があ
った。Further, it is essential that the developer whose concentration has been restored as described above is always promptly conveyed to the developer carrying member. However, if the developer transport path between the developer carrying part and the toner replenishing part is short, the supplied toner may be transported onto the developer carrying member before being uniformly dispersed in the developer. There were problems such as fogging and scattering. Furthermore, if the conveyance path is long and the developer is stirred for a long time, there is a problem that the developing device cannot be made smaller.
〔発明が解決しようとしている問題点〕本発明は、上述
従来例に鑑み、トナー補給口から現像剤担持部材までの
現像剤の搬送路が短い系において、トナーの現像剤中へ
の速やかな分散を行い、現像剤担持部には常に充分にト
ナーが分散された現像剤が搬送されるような構成を得る
ことを目的とする。[Problems to be Solved by the Invention] In view of the above-mentioned conventional examples, the present invention aims to quickly disperse toner into developer in a system in which the developer transport path from the toner replenishment port to the developer carrying member is short. It is an object of the present invention to obtain a configuration in which a developer in which toner is sufficiently dispersed is always conveyed to a developer carrying portion.
上記の目的を達成するために、本発明では現像剤搬送路
上の下流側で、現像剤補給口と現像剤担持部材との間の
搬送路上に、現像剤の一時的滞留を生じさせる撹拌混合
部材を配し、補給されたトナーが現像剤担持部材に搬送
される前に、速やかに現像剤中に分散混合されるように
したものである。In order to achieve the above object, the present invention provides a stirring and mixing member that causes temporary retention of the developer on the downstream side of the developer transport path, on the transport path between the developer replenishment port and the developer carrying member. is arranged so that the replenished toner is quickly dispersed and mixed into the developer before being conveyed to the developer carrying member.
以下、本発明の実施例を図面に基づいて説明する。 Embodiments of the present invention will be described below based on the drawings.
第１図は電子写真装置における現像装置の断面図である
。図中、８は現像容器であり、該現像容器８は、その内
部を隔壁５によりトナー収納部りと磁性粒子を含有する
二成分現像剤を収納する現像剤収納部Ｃとに区画されて
いる。トナー収納部り内の収納トナー及び、現像剤収納
部Ｃ内の現像剤は図には省略した。現像剤収納部Ｃは、
隔壁４により現像剤撹拌部Ｃ３と現像剤を担持搬送して
電子写真感光体等の静電像保持体Ｐに付与して静電像を
現像する現像剤担持部材ｌへの現像剤供給部Ｃ２に区画
される。トナー収納部り内の収納トナーは、トナー搬送
部材９が回転駆動されることにより、・隔壁５に設けら
れ、スクリーンメツシュアの張られたトナー補給口６か
ら現像剤収納部Ｃ内へ補給される。FIG. 1 is a sectional view of a developing device in an electrophotographic apparatus. In the figure, 8 is a developer container, and the inside of the developer container 8 is divided by a partition wall 5 into a toner storage portion and a developer storage portion C that stores a two-component developer containing magnetic particles. . The toner stored in the toner storage part and the developer in the developer storage part C are omitted from the diagram. The developer storage section C is
A developer supplying section C2 to a developer stirring section C3 and a developer carrying member L that supports and conveys the developer and applies it to an electrostatic image carrier P such as an electrophotographic photoreceptor to develop an electrostatic image by means of a partition wall 4. It is divided into The stored toner in the toner storage section is replenished into the developer storage section C through the toner replenishment port 6 provided in the partition wall 5 and covered with a screen mesh by the rotation of the toner conveyance member 9. Ru.
ｌは現像剤収納部Ｃ内に配設された現像スリーブであり
、これはマグネットロールｌｂを内蔵した非磁性物質で
できた現像スリーブ１ａで構成されている。Ｎ、、Ｎ２
．Ｎ３．Ｓ、、Ｓ２．Ｓ３はマグネットロール１ｂの着
磁位置を示している。マグネットロールｌｂは両端部を
固定支持されていて回転せず、その外側の現像スリーブ
ｌａがマグネットロールｌｂの周りを所定の周速で矢印
方向に回転駆動され、前記の通り現像剤を担持搬送する
。A developing sleeve 1 is disposed in the developer storage section C, and is composed of a developing sleeve 1a made of a non-magnetic material and having a built-in magnet roll lb. N,,N2
．． N3. S,,S2. S3 indicates the magnetized position of the magnet roll 1b. The magnet roll lb is fixedly supported at both ends and does not rotate, and the outer developing sleeve la is driven to rotate around the magnet roll lb at a predetermined circumferential speed in the direction of the arrow, carrying and conveying the developer as described above. .
２．３はそれぞれ現像スリーブ１にほぼ平行に配設され
た現像剤撹拌・搬送手段としてのスクリューである。こ
の２つのスクリュー２．３の現像剤の搬送方向は互いに
逆方向になるように設定されている。本実施例において
は、第２図の矢印方向に現像剤を搬送している。現像剤
収納部Ｃ内に設けられた隔壁４は、第２図に示すように
両端部に開口４ａ。Reference numerals 2 and 3 designate screws each disposed substantially parallel to the developing sleeve 1 as a means for stirring and transporting the developer. The directions in which the developer is conveyed by these two screws 2.3 are set to be opposite to each other. In this embodiment, the developer is transported in the direction of the arrow in FIG. The partition wall 4 provided in the developer storage section C has openings 4a at both ends, as shown in FIG.
４ｂが形成されており、前後のスクリュー２．３によっ
て搬送された現像剤は、該開口４ａ、４ｂにより現像剤
の受は渡しを行う。スク゛リュー２．３には現像剤の受
は渡しが速やかになされるように、各々、２ａ、 ２ｂ
、 ３ａのヒレ状部材が取り付けられている。The developer conveyed by the front and rear screws 2.3 is received and delivered through the openings 4a and 4b. Screws 2.3 are equipped with 2a and 2b, respectively, to receive and transfer the developer quickly.
, 3a are attached to the fin-like members.
更に現像容器８の現像剤収納部Ｃには、現像スリーブｌ
ａの周面上の現像剤の循環領域を指定する為の現像剤量
規制部材１１．１５が設けられている。Further, in the developer storage section C of the developer container 8, there is a developing sleeve l.
A developer amount regulating member 11.15 is provided for specifying a developer circulation area on the circumferential surface of a.
スリーブｌの周面上の現像剤は、現像剤掻き落とし部材
１３により一部は掻き落とされ、一部は現像部の方向へ
と搬送される。掻き落とし部材１３によって掻き落とさ
れた現像剤は、現像剤搬送スクリュー２により搬送され
る現像剤と混合されながら搬送される。また搬送スクリ
ュー２により搬送される現像剤の一部は開口１７を通っ
て現像剤担持部材ｌａ力方向搬送される。現像部方向へ
搬送される現像剤は、現像剤循環規制部材１１と現像ス
リーブ１ａの間隙に押し込まれ、密な状態でなおかつ速
やかに搬送され、ドクターブレード６によって現像剤の
ブラシの高さが規制され、現像容器の外部側へ搬送され
る。A portion of the developer on the circumferential surface of the sleeve I is scraped off by the developer scraping member 13, and a portion is conveyed toward the developing section. The developer scraped off by the scraping member 13 is conveyed while being mixed with the developer conveyed by the developer conveyance screw 2. Further, a part of the developer transported by the transport screw 2 passes through the opening 17 and is transported in the direction of the developer carrying member la. The developer conveyed toward the developing section is pushed into the gap between the developer circulation regulating member 11 and the developing sleeve 1a, and is conveyed quickly and in a dense state, and the height of the developer brush is regulated by the doctor blade 6. and transported to the outside of the developer container.
また、現像剤循環規制部材１１の現像スリーブ１ａに対
する対向面と同一面内には、トナー濃度検知部材１２が
配設されている。これにより、トナー濃度制御に必要な
トナー濃度検知部への現像剤の近速な搬送、検知部にお
ける適正な現像剤の撹拌・混合状態及び検知部において
検知に必要なある所定の量の現像剤とその密度の一様性
という条件が満足される。特に、スリーブ対向面と同一
面内に上記現像剤量検知部材１２の検知面を配すること
により、検知領域と検知領域外の現像剤の流れが同等と
なり、検知部材を現像スリーブ１ａに近接して配した時
の弊害を除去することができる。Further, a toner concentration detection member 12 is disposed in the same plane as the surface of the developer circulation regulating member 11 facing the developing sleeve 1a. This ensures rapid conveyance of the developer to the toner concentration detection section necessary for toner concentration control, proper stirring and mixing of the developer in the detection section, and a predetermined amount of developer necessary for detection in the detection section. and the uniformity of its density are satisfied. In particular, by arranging the detection surface of the developer amount detection member 12 in the same plane as the sleeve facing surface, the flow of the developer in the detection area and the developer outside the detection area are the same, and the detection member can be placed close to the developing sleeve 1a. It is possible to eliminate the negative effects caused by placing the
検知部材１２の一例を第３図に示す。図中、１２ａはラ
ンプであり、１２ｂ、１２ｃはそれぞれ現像剤による反
射光の光景及びランプの直接光の光量を検知するセンサ
ーであり、またハウジング１７は遮光性の部材より成る
。１４は透光性の部材で形成された検知窓であり、これ
は現像剤循環規制部材１１のスリーブ対向面と同一面内
に配設されている。各々のセンサー１２ｂ、 １２ｃに
入る光の光景は所定の回路により電圧に変換される。セ
ンサー１２ｂ、１２ｃによる電圧をぞれぞれｖ ｂ、
’ｖ 、とし、所定のトナー濃度の現像剤が存在する時
、
■ｂ＝ｖ。An example of the detection member 12 is shown in FIG. In the figure, 12a is a lamp, 12b and 12c are sensors for detecting the appearance of light reflected by the developer and the amount of direct light from the lamp, respectively, and the housing 17 is made of a light-shielding member. A detection window 14 is made of a light-transmitting member, and is disposed in the same plane as the surface of the developer circulation regulating member 11 facing the sleeve. The light scene entering each sensor 12b, 12c is converted into a voltage by a predetermined circuit. The voltages from the sensors 12b and 12c are respectively v b,
'v, and when there is a developer with a predetermined toner concentration, (2) b=v.
となるように回路を調整すると、トナー濃度の増減に対
してｖｂは増減し、ｖｃは常に一定であるので、
ｖｂ＞ｖｏ
の時、トナー補給ＯＦＦとしく即ち、部材９，１０の回
転を停止する）、
ｖｂく■。If the circuit is adjusted so that vb increases or decreases as the toner concentration increases and vc remains constant, when vb > vo, toner supply is turned off, that is, the rotation of members 9 and 10 is stopped. ), vbku■.
の時、トナー補給ＯＮという動作を（り返すことにより
、現像剤のトナー濃度をある所定の値に制御することが
できる。At this time, by repeating the operation of turning on toner supply, the toner concentration of the developer can be controlled to a certain predetermined value.
この時、トナー補給ＯＮという動作により、トナー収納
部り内のトナーは、トナー搬送部材９が回転駆動するこ
とにより、トナー補給口６から現像剤収納部Ｃ内へ補給
され、スクリュー３により現像剤と撹拌・混合されなが
ら搬送され、開口４ｂ部において現像剤供給部Ｃ２側に
受は渡される。At this time, due to the operation of toner replenishment ON, the toner in the toner storage section is replenished from the toner replenishment port 6 into the developer storage section C by rotationally driving the toner conveyance member 9, and the developer is removed by the screw 3. The developer is transported while being stirred and mixed, and the receiver is delivered to the developer supply section C2 side at the opening 4b.
スクリュー３の現像剤送り方向に複数配列された補給口
６のうち、スクリュー３の最下流側に位置する補給口６
から補給されたトナーは数秒以内に現像剤担持部材上に
搬送されはじめる。従って補給されたトナーが現像剤担
持部材に達した時に、充分に現像剤と撹拌・混合された
状態になるように、本発明においては、スクリュー３の
現像剤送り方向についての最下流側に配されたトナー補
給口６と、現像剤撹拌部ｃｌから現像剤担持部材への現
像剤供給部Ｃ２への現像剤の受は渡し部４ｂとの間のス
クリュー３上にスクリューの螺旋間をつなぐヒレ状部材
３ｂを配している。上記構成によれば、ヒレ状部材３ｂ
の配された位置で現像剤の一時的な乱流による滞留状態
が生じ、その乱流状態で現像剤とトナーが充分撹拌・混
合され、その後受は渡し部４ｂに現像剤は搬送される。Among the plurality of supply ports 6 arranged in the developer feeding direction of the screw 3, the supply port 6 is located at the most downstream side of the screw 3.
The toner replenished from the toner starts to be conveyed onto the developer carrying member within a few seconds. Therefore, in the present invention, the screw 3 is disposed on the most downstream side in the developer feeding direction so that the supplied toner is sufficiently stirred and mixed with the developer when it reaches the developer carrying member. A fin connecting the spirals of the screw is provided on the screw 3 between the toner supply port 6 and the transfer portion 4b to receive the developer from the developer stirring portion cl to the developer supply portion C2 to the developer carrying member. A shaped member 3b is arranged. According to the above configuration, the fin-like member 3b
A stagnation state occurs due to a temporary turbulent flow of the developer at the position where the developer is disposed, and the developer and toner are sufficiently stirred and mixed in the turbulent flow, and then the developer is conveyed to the transfer section 4b.
第４図に示す様に、３ｂのかわりに、２１の歯車状部材
を配しても同様の効果がある。As shown in FIG. 4, a similar effect can be obtained by disposing a gear-shaped member 21 in place of 3b.
第５図に示すように、３ｂのかわりに、２２の円板状部
材を軸に対して傾けて配し、スクリュー３の現像剤搬送
方向に対して前後する方向の力を現像剤に与えても同様
の効果が得られる。As shown in FIG. 5, instead of 3b, 22 disk-shaped members are arranged inclined with respect to the axis, and force is applied to the developer in a direction back and forth with respect to the developer conveying direction of the screw 3. A similar effect can be obtained.
第６図に示す様に、３ｂのかわりに最下流部のトナー補
給口６と受は渡し部４ｂとの間の現像剤搬送路の一部を
狭めることによっても同様の効果が得られる。As shown in FIG. 6, the same effect can be obtained by narrowing a part of the developer conveyance path between the toner replenishing port 6 at the downstream end and the transfer portion 4b instead of the toner supply port 3b.
以上の説明で明らかな様に、本発明によればトナーと磁
性粒子を有する現像剤を現像剤担持部材に保持させ、潜
像保持体面を現像する現像装置において、トナー補給口
から現像剤担持部材への現像剤の撹拌・搬送路上に現像
剤の流れに乱流を生じさせる部材、或いは構成をとるこ
とにより、トナー補給口と現像剤担持部材との間の現像
剤の搬送路が短い系においても、現像剤の充分な撹拌・
混合を行うことができ、常にカブリ・飛散のない適正な
画像を得ることができるようになった。As is clear from the above description, according to the present invention, in a developing device that develops a surface of a latent image carrier by holding a developer containing toner and magnetic particles in a developer carrying member, the toner supply port is connected to the developer carrying member. In systems where the developer transport path between the toner replenishment port and the developer carrying member is short, by using a member or structure that creates turbulence in the flow of developer on the developer stirring and transport path. Also, make sure that the developer is thoroughly stirred and
It is now possible to perform mixing and always obtain proper images without fogging or scattering.
第１図は本発明に係る現像装置の側面断面図、第２図は
同現像装置の１断面図、第３図は現像剤検知部の断面図
、第４図、第５図、第６図は他の実施例の場合の１断面
図の一部分である。
１はスリーブ、２，３は撹拌、搬送スクリュー３ｂはヒ
レ状部材、６はトナー補給口、Ｃは現像剤収納部、Ｄは
トナー収納部である。FIG. 1 is a side sectional view of a developing device according to the present invention, FIG. 2 is a sectional view of the developing device, FIG. 3 is a sectional view of a developer detection section, and FIGS. 4, 5, and 6. is a portion of a cross-sectional view of another embodiment. Reference numeral 1 designates a sleeve, 2 and 3 stir, the conveyance screw 3b represents a fin-like member, 6 represents a toner replenishment port, C represents a developer storage area, and D represents a toner storage area.
Claims (1)
向に搬送する搬送手段、該現像剤搬送路とは区画された
現像剤収納部、該現像剤収納部より現像剤搬送路上に現
像剤を供給する為の補給口、を有する現像装置において
、現像剤搬送路上の下流側に現像剤の一時的滞留部を形
成する撹拌混合部材を有することを特徴とする現像装置
。A developer transport path, a transport means for transporting the developer in a predetermined direction while agitating the developer in the transport path, a developer storage section separated from the developer transport path, and a developing device on the developer transport path from the developer storage section. What is claimed is: 1. A developing device having a replenishment port for supplying developer, the developing device having a stirring and mixing member that forms a temporary retention area for developer on the downstream side of a developer transport path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63217212A JPH0263078A (en) | 1988-08-30 | 1988-08-30 | Developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63217212A JPH0263078A (en) | 1988-08-30 | 1988-08-30 | Developing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0263078A true JPH0263078A (en) | 1990-03-02 |
Family
ID=16700621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63217212A Pending JPH0263078A (en) | 1988-08-30 | 1988-08-30 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0263078A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006195356A (en) * | 2005-01-17 | 2006-07-27 | Fuji Xerox Co Ltd | Developing device and image forming apparatus |
| CN104076652A (en) * | 2013-03-26 | 2014-10-01 | 富士施乐株式会社 | Powder transport device, developing device, and image forming apparatus |
-
1988
- 1988-08-30 JP JP63217212A patent/JPH0263078A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006195356A (en) * | 2005-01-17 | 2006-07-27 | Fuji Xerox Co Ltd | Developing device and image forming apparatus |
| CN104076652A (en) * | 2013-03-26 | 2014-10-01 | 富士施乐株式会社 | Powder transport device, developing device, and image forming apparatus |
| JP2014191038A (en) * | 2013-03-26 | 2014-10-06 | Fuji Xerox Co Ltd | Powder conveyance device, developing device, and image forming apparatus |
| US9201346B2 (en) | 2013-03-26 | 2015-12-01 | Fuji Xerox Co., Ltd. | Powder transport device, developing device, and image forming apparatus |
| CN104076652B (en) * | 2013-03-26 | 2020-04-07 | 富士施乐株式会社 | Powder conveying device, developing device, and image forming apparatus |
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