JPS62201482A - Toner concentration detector for developer - Google Patents
Toner concentration detector for developerInfo
- Publication number
- JPS62201482A JPS62201482A JP4505586A JP4505586A JPS62201482A JP S62201482 A JPS62201482 A JP S62201482A JP 4505586 A JP4505586 A JP 4505586A JP 4505586 A JP4505586 A JP 4505586A JP S62201482 A JPS62201482 A JP S62201482A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- toner
- toner concentration
- developing device
- magnet
- 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
- 230000007423 decrease Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 108091008695 photoreceptors Proteins 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
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- 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１例えば電子写真式複写機に用いられるトナー
濃度検出器に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a toner concentration detector used, for example, in an electrophotographic copying machine.
（従来の技術）
例えば、電子写真複写機では、原稿画像に応じた静電潜
像を感光体上に形成し、その静電潜像をトナー現像し、
現像された１−ナー像を記録紙に転写することにより複
写物が得られる。現像剤としてトナーとキャリアとから
なる二成分系現像剤を使用した電子写真複写機では、現
像工程でトナーのみが消費されるため、現像装置内のト
ナー濃度が低下する。トナー濃度が低下すると、得られ
る画像に濃度不足、キャリア引き１文字切れ等を招来す
る。従って、常に高品質な画像を得るためには、現像剤
のトナー濃度を一定に保たなければならない。このため
１通常、複写機では現像装置内における現像剤のトナー
濃度を検出し、トナー濃度が所定値よりも低下した場合
には、トナーホッパーより現像装置内へトナーを補給し
て現像装置内の現像剤のトナー濃度を常時一定に制御す
るようになっている。(Prior Art) For example, in an electrophotographic copying machine, an electrostatic latent image corresponding to an original image is formed on a photoconductor, and the electrostatic latent image is developed with toner.
A copy is obtained by transferring the developed 1-toner image onto recording paper. In an electrophotographic copying machine that uses a two-component developer consisting of toner and carrier as a developer, only the toner is consumed in the developing process, so the toner concentration in the developing device decreases. When the toner density decreases, the obtained image will have insufficient density, one character will be cut off due to carrier draw, etc. Therefore, in order to always obtain high quality images, the toner concentration of the developer must be kept constant. For this reason, 1. Normally, in a copying machine, the toner concentration of the developer in the developing device is detected, and if the toner concentration drops below a predetermined value, toner is replenished from the toner hopper into the developing device. The toner concentration of the developer is always controlled to be constant.
従来のトナー濃度検出器としては、現像剤中の磁性キャ
リアが消費されず、現像剤中のキャリアとトナーとの混
合比が変化することから、現像剤の透磁率が変化するこ
とに着目し、該透磁率の変化に基づいて生じるコイルの
りアクタンス値の変化によりトナー濃度を検出するもの
が知られている。しかし、この方法では、現像剤のトナ
ー濃度の変化のみならず、現像剤の流動性１粒度分布。As a conventional toner concentration detector, we focused on the fact that the magnetic carrier in the developer is not consumed and the mixing ratio of the carrier and toner in the developer changes, so the magnetic permeability of the developer changes. It is known to detect toner concentration based on a change in coil actance value that occurs based on a change in magnetic permeability. However, this method not only changes the toner concentration of the developer, but also changes the fluidity of the developer and the particle size distribution.
電気抵抗の変化等によりコイルのりアクタンス値が大き
く変化するため、正確なトナー濃度が検出できない。Since the coil actance value changes greatly due to changes in electrical resistance, etc., accurate toner concentration cannot be detected.
また、現像剤中のトナーの消費により現像剤の体積が変
化することから、現像装置内の現像剤のレベル変化によ
りトナー濃度を検出する方法も採用されている。この方
法では、現像剤中のキャリアとトナーとの混合体積比率
はキャリアが大きいため、トナーの消費による現像剤の
レベル変化が極めて少ない。このため、複写機ごとに現
像剤のレベルとトナー濃度との関係が異なり、各複写機
ごとに設定レベルを微調整しなければならない。Furthermore, since the volume of the developer changes as the toner in the developer is consumed, a method of detecting the toner concentration based on changes in the level of the developer in the developing device has also been adopted. In this method, since the mixed volume ratio of carrier and toner in the developer is large, the level of the developer hardly changes due to consumption of toner. Therefore, the relationship between the developer level and toner concentration differs from copying machine to copying machine, and the set level must be finely adjusted for each copying machine.
（発明が解決しようとする問題点）
本発明は、上記従来の問題を解決するものであり、その
目的は、現像剤の流動性２粒度分布、電気抵抗等の変化
に影響されず、かつ複写機などの装置ごとの微調整の必
要がない現像剤のトナー濃度検出器を提供することにあ
る。(Problems to be Solved by the Invention) The present invention is intended to solve the above-mentioned conventional problems, and its purpose is to provide a copying machine that is not affected by changes in developer fluidity, particle size distribution, electrical resistance, etc. An object of the present invention is to provide a developer toner concentration detector that does not require fine adjustment for each device such as a machine.
（問題点を解決するための手段）
本発明は、磁性のキャリアおよび非磁性のトナーにて構
成される現像剤のトナー濃度検出器であり、トナーが消
費される現像装置に、現像剤とは対向するように配設さ
れた磁石と、該磁石と現像剤との間に検知面が該磁石に
当接するように介装された圧力センサーと、を具備し、
現像剤が該圧力センサーを介して該磁石に吸引されたと
きの該圧力センサーにかかる圧力に基づき該現像剤のト
ナー濃度を検出し、そのことにより上記目的が達成され
る。(Means for Solving the Problems) The present invention is a toner concentration detector for a developer composed of a magnetic carrier and a non-magnetic toner. Comprising magnets arranged to face each other, and a pressure sensor interposed between the magnet and the developer so that a sensing surface comes into contact with the magnet,
The toner concentration of the developer is detected based on the pressure applied to the pressure sensor when the developer is attracted to the magnet via the pressure sensor, thereby achieving the above object.
（実施例） 以下に本発明の実施例について説明する。(Example) Examples of the present invention will be described below.
第１図に示すように本発明のトナー濃度検出器１０は２
例えば電子写真式複写機の現像装置２０に取りつけられ
る。現像装置２０には、磁性のキャリアと非磁性のトナ
ーとから構成される現像剤２２が収容される。該トナー
濃度検出器１０は、電磁石１１と圧力センサー１２とを
有する。圧力センサー１２は。As shown in FIG. 1, the toner concentration detector 10 of the present invention has two
For example, it is attached to the developing device 20 of an electrophotographic copying machine. The developing device 20 accommodates a developer 22 composed of a magnetic carrier and a non-magnetic toner. The toner concentration detector 10 has an electromagnet 11 and a pressure sensor 12. The pressure sensor 12 is.
現像装置２０のハウジング２１の外面に、その検知面を
外方に向けて取りつけられる。該圧力センサー１２の取
りつけは、ハウジング２１内における現像剤２２の流動
域に対向していればよい。電磁石１１は。It is attached to the outer surface of the housing 21 of the developing device 20 with its detection surface facing outward. The pressure sensor 12 may be mounted opposite the flow area of the developer 22 within the housing 21. The electromagnet 11 is.
圧力センサー１２の検知面に当接している。従って。It is in contact with the detection surface of the pressure sensor 12. Therefore.
該電磁石ｌｌは、圧力センサー１２を介して、ハウジン
グ２１内の現像剤２２と対向している。該電磁石１１は
、ハウジング２１内のトナー濃度を検出する場合にのみ
通電されて磁性を持つ。The electromagnet 11 faces the developer 22 in the housing 21 via the pressure sensor 12. The electromagnet 11 is energized and becomes magnetic only when detecting the toner concentration within the housing 21 .
圧力センサー１２は何ら格別である必要はなく。The pressure sensor 12 does not need to be anything special.
圧電素子を用いたもの等が使用される。A device using a piezoelectric element is used.
現像装置２０の上方には、トナーホッパー３０が配設さ
れている。該トナーホッパー３０の下部には。A toner hopper 30 is arranged above the developing device 20. At the bottom of the toner hopper 30.
トナー補給ローラー３１が回転可能に取りつけられてい
る。該トナー補給ローラー３１の回転により。A toner supply roller 31 is rotatably mounted. By rotation of the toner supply roller 31.
現像装置２０のハウジング２１内へトナー３２が補給さ
れる。該トナー補給ローラー・３１は、上述した本発明
のトナー濃度検出器１０の出力に基づいて、その回転が
制御される。Toner 32 is replenished into the housing 21 of the developing device 20 . The rotation of the toner supply roller 31 is controlled based on the output of the toner concentration detector 10 of the present invention described above.
トナーホッパー３０から現像装置２０のハウジング２１
内へ補給されたトナーは、ハウジング２１内の攪拌ロー
ラー２３にて、現像剤２２と攪拌される。２４は。From the toner hopper 30 to the housing 21 of the developing device 20
The toner supplied into the housing 21 is agitated with the developer 22 by an agitation roller 23 within the housing 21 . 24 is.
マグネットローラ２５のまわりに回転自在に支持された
スリーブであり、矢印Ａの方向に回転駆動される。そし
て該スリーブ２４はマグネットローラ２５の磁力により
、その表面に現像剤２２を吸着保持しつつ回転する。現
像剤２２は、スリーブ２４の回転により、整髪されてそ
の周面に磁気ブラシを形成する。該磁気ブラシのトナー
は、感光体４の表面に形成された静電潜像に付着して、
該静電潜像を可視化する。This sleeve is rotatably supported around the magnet roller 25, and is rotationally driven in the direction of arrow A. The sleeve 24 rotates while attracting and holding the developer 22 on its surface by the magnetic force of the magnet roller 25. The developer 22 is styled by the rotation of the sleeve 24 to form a magnetic brush on its circumferential surface. The toner of the magnetic brush adheres to the electrostatic latent image formed on the surface of the photoreceptor 4,
The electrostatic latent image is visualized.
（作用）
本発明のトナー濃度検出器１０による。現像装置２０内
の現像剤２２のトナー濃度の検出は次のように行われる
。トナー濃度の検出の際に、電磁石１１は通電され、該
電磁石１１は磁性をもつ。その結果。(Function) According to the toner concentration detector 10 of the present invention. Detection of the toner concentration of the developer 22 in the developing device 20 is performed as follows. When detecting the toner concentration, the electromagnet 11 is energized and has magnetism. the result.
電磁石１１の磁力と現像装置２０内の現像剤２２の磁力
により１両者は引き合い、電磁石１１は圧力センサー１
２の検知面を押圧する。圧力センサー１２は、電磁石１
１と現像剤２２との引力に対応した信号を出力する。The magnetic force of the electromagnet 11 and the magnetic force of the developer 22 in the developing device 20 attract each other, and the electromagnet 11 is connected to the pressure sensor 1.
Press the detection surface 2. The pressure sensor 12 is an electromagnet 1
A signal corresponding to the attractive force between the developer 1 and the developer 22 is output.
現像装置２０内における現像剤２２は、磁性のキャリア
と非磁性のトナーにて構成されているため。This is because the developer 22 in the developing device 20 is composed of a magnetic carrier and a non-magnetic toner.
現像剤２２全体の磁化率は、該現像剤２２中のトナーの
割合（トナー濃度）に対応する。即ち、現像剤２２内の
トナー量が少なく、トナー濃度が低下すると、現像剤全
体の磁化率が一ヒ弄する。反対に、現像剤２２内のトナ
ー量が多り、トナー濃度が上昇すると現像剤２２全体の
磁化率は低下する。磁化率が上昇すれば、現像剤２２と
電磁石１１との引力は増加する。反対に磁化率が低下す
れば、現像剤２２と電磁石１１との引力は減少する。The magnetic susceptibility of the entire developer 22 corresponds to the proportion of toner (toner concentration) in the developer 22. That is, when the amount of toner in the developer 22 is small and the toner concentration decreases, the magnetic susceptibility of the entire developer changes. On the other hand, when the amount of toner in the developer 22 increases and the toner concentration increases, the magnetic susceptibility of the developer 22 as a whole decreases. As the magnetic susceptibility increases, the attractive force between the developer 22 and the electromagnet 11 increases. Conversely, if the magnetic susceptibility decreases, the attractive force between the developer 22 and the electromagnet 11 decreases.
圧力センサー１２は、現像剤２２と電磁石１１との引力
に対応した信号を出力する。そして、現像剤２２と電磁
石１１との引力が所定値以上になったことを検出すれば
、該圧力センサー１２が現像装置２０内のトナー濃度が
低下したものとして、トナーホッパー３０内のトナー補
給ローラー３１は回転され、トナーホッパー３０内のｌ
・ナー３２は、現像装置２０内に補給される。トナーの
補給により、現像装置２０内のトナー濃度が上界して、
現像剤２２の磁化率が低下し、現像剤２２と電磁石１１
との引力が低下する。圧力センサー１２はこのような状
態を検出する。その結果、トナー補給ローラー３１の回
転は停止される。The pressure sensor 12 outputs a signal corresponding to the attractive force between the developer 22 and the electromagnet 11. When it is detected that the attractive force between the developer 22 and the electromagnet 11 has exceeded a predetermined value, the pressure sensor 12 determines that the toner concentration in the developing device 20 has decreased, and the toner replenishing roller in the toner hopper 30 31 is rotated, and the l in the toner hopper 30 is rotated.
- The toner 32 is replenished into the developing device 20. Due to toner replenishment, the toner concentration in the developing device 20 reaches an upper limit,
The magnetic susceptibility of the developer 22 decreases, and the developer 22 and the electromagnet 11
The gravitational force between them decreases. Pressure sensor 12 detects such a condition. As a result, the rotation of the toner supply roller 31 is stopped.
これにより、現像装置２０内のトナー濃度は所定の値に
制御される。Thereby, the toner density within the developing device 20 is controlled to a predetermined value.
なお９本発明のトナー濃度検出器の配設位置は。9. The location of the toner concentration detector of the present invention.
上述の実施例のように、現像装置２０内のハウジング２
１外面に限らず、ハウジング２１内でもよい。As in the above embodiment, the housing 2 in the developing device 20
It is not limited to the outside surface of the housing 21, but may be inside the housing 21.
（発明の効果）
本発明のトナー濃度検出器は、このように、簡潔な構造
でありながら、トナー濃度の変化にもとづ（現像剤の磁
化率の変化を的確にとらえるため。(Effects of the Invention) As described above, the toner concentration detector of the present invention has a simple structure, but is based on changes in toner concentration (in order to accurately detect changes in the magnetic susceptibility of the developer).
現像剤の流動性２粒度分布、電気抵抗等の変化に影響さ
れず、正確にトナー濃度を検出し得る。Toner concentration can be accurately detected without being affected by changes in developer fluidity, particle size distribution, electrical resistance, etc.
４、ス のへ なＵ
第１図は本発明の現像剤のトナー濃度検出器を装着した
現像装置の断面図である。4. Figure 1 is a sectional view of a developing device equipped with a developer toner concentration detector of the present invention.
ｌＯ・・・トナー濃度検出器、１１・・・電磁石、１２
・・・圧力センサー、２０・・・現像装置、 ２１・・
・ハウジング、２４・・・スリーブ、 ３０・・・トナ
ーホッパー、３１・・・トナー補給ローラー。lO... Toner concentration detector, 11... Electromagnet, 12
...Pressure sensor, 20...Developing device, 21...
- Housing, 24... Sleeve, 30... Toner hopper, 31... Toner supply roller.
以上that's all
Claims (1)
る現像剤のトナー濃度検出器であり、トナーが消費され
る現像装置に、現像剤とは対向するように配設された磁
石と、 該磁石と現像剤との間に検知面が該磁石に当接するよう
に介装された圧力センサーと、 を具備し、 現像剤が該圧力センサーを介して該磁石に吸引されたと
きの該圧力センサーにかかる圧力に基づき該現像剤のト
ナー濃度を検出する現像剤のトナー濃度検出器。 ２、前記磁石はトナー濃度の検出時にのみ通電される電
磁石である特許請求の範囲第１項に記載の現像剤のトナ
ー濃度検出器。[Scope of Claims] 1. A toner concentration detector for a developer composed of a magnetic carrier and a non-magnetic toner, which is disposed opposite to the developer in a developing device where the toner is consumed. a pressure sensor interposed between the magnet and the developer so that a sensing surface comes into contact with the magnet, and the developer is attracted to the magnet via the pressure sensor. A toner concentration detector for a developer that detects a toner concentration of the developer based on the pressure applied to the pressure sensor when the pressure is applied to the pressure sensor. 2. The developer toner concentration detector according to claim 1, wherein the magnet is an electromagnet that is energized only when detecting the toner concentration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4505586A JPS62201482A (en) | 1986-02-28 | 1986-02-28 | Toner concentration detector for developer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4505586A JPS62201482A (en) | 1986-02-28 | 1986-02-28 | Toner concentration detector for developer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62201482A true JPS62201482A (en) | 1987-09-05 |
Family
ID=12708667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4505586A Pending JPS62201482A (en) | 1986-02-28 | 1986-02-28 | Toner concentration detector for developer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62201482A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0699971A3 (en) * | 1994-08-31 | 1998-08-05 | Kyocera Corporation | Toner container and developing device including the same |
| JP2008096592A (en) * | 2006-10-10 | 2008-04-24 | Ricoh Co Ltd | Developing device and image forming apparatus |
-
1986
- 1986-02-28 JP JP4505586A patent/JPS62201482A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0699971A3 (en) * | 1994-08-31 | 1998-08-05 | Kyocera Corporation | Toner container and developing device including the same |
| JP2008096592A (en) * | 2006-10-10 | 2008-04-24 | Ricoh Co Ltd | Developing device and image forming apparatus |
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