JPH03271780A - Developer stirring device for image forming device - Google Patents
Developer stirring device for image forming deviceInfo
- Publication number
- JPH03271780A JPH03271780A JP2072339A JP7233990A JPH03271780A JP H03271780 A JPH03271780 A JP H03271780A JP 2072339 A JP2072339 A JP 2072339A JP 7233990 A JP7233990 A JP 7233990A JP H03271780 A JPH03271780 A JP H03271780A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- stirring
- flow
- image forming
- detecting
- 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.)
- Granted
Links
- 238000003756 stirring Methods 0.000 title claims abstract description 26
- 229920000642 polymer Polymers 0.000 claims description 17
- 238000001514 detection method Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 239000010409 thin film Substances 0.000 claims description 3
- 238000013019 agitation Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007639 printing Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000002573 ethenylidene group Chemical group [*]=C=C([H])[H] 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
Landscapes
- Dry Development In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、例えば感光体の表面に形成された静電潜像
を、帯電性の微細粉体よりなる現像剤で現像するように
した電子写真装置等の像形成装置の現像剤攪拌装置に関
する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electrostatic latent image formed on the surface of a photoreceptor, for example, in which an electrostatic latent image is developed with a developer made of fine chargeable powder. The present invention relates to a developer stirring device for an image forming device such as a photographic device.
電子写真装置等の現像剤としては、トナーとキャリアと
を混合したいわゆる二成分現像剤が広く用いられており
、現像器内で現像剤を攪拌してトナーとキャリアに摩擦
帯電を生じさせ、トナーに電荷を付与している。A so-called two-component developer, which is a mixture of toner and carrier, is widely used as a developer in electrophotographic devices.The developer is stirred in the developer to generate frictional charge between the toner and carrier, and the toner is imparts an electric charge to.
現像剤を収容した現像器内には、一般に、アジテータと
呼ばれる攪拌具が設けられており、モータによってアジ
テータを回転させて現像剤を攪拌している。このアジテ
ータは、従来は画一的な回転数で駆動されていた。A stirring device called an agitator is generally provided in a developing device containing a developer, and the agitator is rotated by a motor to agitate the developer. Conventionally, this agitator was driven at a uniform rotation speed.
安定した現像を得るためには、トナーの電荷を一定範囲
内にコントロールする必要かある。このトナーの帯電に
影響を与えるのは、現像剤の適度な攪拌と、現像剤の流
れの状態である。In order to obtain stable development, it is necessary to control the charge of the toner within a certain range. What influences the charging of the toner is the appropriate agitation of the developer and the state of the flow of the developer.
現像剤の攪拌が悪いと、トナーの帯電量か小さくなって
背景部の汚れの原因となる。一方、現像剤を攪拌しすぎ
ると、トナーの帯電量が大きくなって、現像剤の流れか
悪くなり、現像部に送り出される現像剤の量が少なくな
って、印字濃度低下の原因となる。また、環境の変化に
よっても、トナーの帯電量は変化する。If the agitation of the developer is poor, the amount of charge on the toner decreases, causing stains in the background area. On the other hand, if the developer is stirred too much, the amount of charge on the toner increases, the flow of the developer becomes poor, and the amount of developer delivered to the developing section decreases, causing a decrease in print density. Furthermore, the amount of charge on the toner changes depending on changes in the environment.
したがって、トナーの帯電量を適正な状態に保つために
は、現像器内での現像剤の流れの状態に対応して現像剤
を攪拌することが望ましく、そのためには現像剤の流れ
の状態を定量的に把握する必要がある。Therefore, in order to maintain the toner charge amount in an appropriate state, it is desirable to stir the developer in accordance with the flow state of the developer within the developing device. It is necessary to understand it quantitatively.
しかし、従来は、現像器内の現像剤の流れを定量的に検
出できるような小型のセンサも無く、アジテータを画一
的に回転させるだけだったので、トナーの帯電量を安定
して適正な状態に保つことができなかった。However, in the past, there was no small sensor that could quantitatively detect the flow of developer in the developing device, and the agitator was simply rotated in a uniform manner. Couldn't keep it in good condition.
この発明は、そのような従来の欠点を解消し、現像剤を
帯電量に応じて攪拌して、現像剤の帯電量を一定範囲内
にコントロールすることかできる像形成装置の現像剤攪
拌装置を提供することを目的とする。The present invention eliminates such conventional drawbacks and provides a developer stirring device for an image forming apparatus that is capable of stirring the developer according to the amount of charge and controlling the amount of charge of the developer within a certain range. The purpose is to provide.
上記の目的を達成するため、本発明の像形成装置の現像
剤攪拌装置は、実施例を説明するための第１図に示され
るように、帯電性の微細粉体よりなる現像剤を収容した
現像器ｌと、上記現像器ｌ内において現像剤を攪拌する
ための現像剤攪拌手段２と、上記現像器１内において現
像剤の流れの圧力を検出するための現像剤流圧検出手段
３と、上記現像剤流圧検出手段３から検出信号を入力し
て、上記現像剤攪拌手段２の動作を制御するための制御
信号を出力する攪拌制御手段４とを設けたことを特徴と
する。In order to achieve the above object, the developer stirring device of the image forming apparatus of the present invention accommodates a developer made of chargeable fine powder, as shown in FIG. 1 for explaining an embodiment. A developing device 1, a developer stirring means 2 for stirring the developer in the developing device 1, and a developer flow pressure detecting means 3 for detecting the pressure of the developer flow in the developing device 1. , an agitation control means 4 is provided which inputs a detection signal from the developer flow pressure detection means 3 and outputs a control signal for controlling the operation of the developer agitation means 2.
なお、上記現像剤流圧検出手段３として、高分子圧電材
料を薄膜状に形成した高分子圧電素子を用いることかで
きる。Note that as the developer flow pressure detecting means 3, a polymer piezoelectric element formed of a polymer piezoelectric material in the form of a thin film may be used.
現像剤流圧検出手段３によって現像器１内の現像剤の流
れの圧力が検出され、その検出信号にしたがって、現像
剤攪拌手段２の動作が攪拌制御手段４によって制御され
る。The pressure of the developer flow in the developing device 1 is detected by the developer flow pressure detection means 3, and the operation of the developer stirring means 2 is controlled by the stirring control means 4 in accordance with the detection signal.
また、高分子圧電素子は柔軟性があり、かつ加工性が良
いので、水晶や強誘電体セラミックなどのようにもろく
て加工し難い材料に比べて、現像剤流圧検出手段３を小
型に形成することができる。In addition, since the polymer piezoelectric element is flexible and easy to process, the developer flow pressure detection means 3 can be made smaller than materials that are brittle and difficult to process, such as crystal or ferroelectric ceramic. can do.
図面を参照して実施例を説明する。 Examples will be described with reference to the drawings.
第１図は本発明を適用したプリンタの構成を示している
。なお、本発明はプリンタに限らず、複写器その他の電
子写真装置等に広く適用することができる。FIG. 1 shows the configuration of a printer to which the present invention is applied. Note that the present invention is not limited to printers, but can be widely applied to copiers and other electrophotographic devices.
第１図において、２１は、所定の電位に帯電されて、用
紙１００に転写する画像情、報を外周面に写して矢印へ
方向に回転する感光ドラム。２２は、感光ドラム２１を
−様な所定電位に帯電させる帯電器である。In FIG. 1, reference numeral 21 denotes a photosensitive drum that is charged to a predetermined potential and rotates in the direction of the arrow while transferring image information to be transferred onto the paper 100 onto its outer peripheral surface. 22 is a charger that charges the photosensitive drum 21 to a predetermined potential such as -.
帯電器２２と現像器ｌとの間には、感光ドラム２１の表
面に文字、図形その他の画像を感光させるための感光部
２３が設けられており、レーザビーム走査装置又はＬＥ
Ｄアレイなどが配置される。A photosensitive section 23 for exposing characters, figures, and other images to the surface of the photosensitive drum 21 is provided between the charger 22 and the developing device l, and a laser beam scanning device or LE
D array etc. are arranged.
２５は用紙送りローラである。印字用紙１００と感光ド
ラム２１との接触部には、感光ドラム２１表面に形成さ
れたトナー像を印字用紙１００に転写するための転写器
２６が設けられている。２７は、トナー像が転写された
印字用紙１００を加熱して画像を定着させるための定着
ローラ。２８は、感光ドラム１１の表面に残ったトナー
などを掃除して排除するためのクリーニングユニットで
ある。25 is a paper feed roller. A transfer device 26 for transferring the toner image formed on the surface of the photosensitive drum 21 to the printing paper 100 is provided at the contact portion between the printing paper 100 and the photosensitive drum 21 . A fixing roller 27 heats the printing paper 100 onto which the toner image has been transferred to fix the image. A cleaning unit 28 cleans and removes toner remaining on the surface of the photosensitive drum 11.
現像器１内の上部には、帯電性の有色微細粉体からなる
トナーとキャリアとを混合した二成分現像剤（以下、単
に「現像剤」という）を補給するためのホッパ１１が設
けられており、ホッパ１１内の現像剤は補給ローラ１２
の回転によって現像器ｌ内に落とされる。A hopper 11 is provided at the upper part of the developing device 1 for replenishing a two-component developer (hereinafter simply referred to as "developer"), which is a mixture of toner made of chargeable colored fine powder and carrier. The developer in the hopper 11 is transferred to the replenishment roller 12.
is dropped into the developing device l by the rotation of the .
現像器ｌ内には、モータとそのモータによって回転され
るアジテータからなる攪拌器２か設けられており、感光
ドラム２１に向けて形成された開口部には、感光ドラム
２１の表面に形成された静電潜像をトナーによって現像
する現像ローラ１３が配置されている。An agitator 2 consisting of a motor and an agitator rotated by the motor is provided in the developing device l, and an agitator 2 formed on the surface of the photosensitive drum 21 is provided in an opening formed toward the photosensitive drum 21. A developing roller 13 is arranged to develop the electrostatic latent image with toner.
攪拌器２及び現像ローラ１３は、矢印Ｂ及びＣのように
回転し、それによって、現像器ｌ内の現像剤は矢印ｄ、
ｅ、ｆのように流れる。The agitator 2 and the developing roller 13 rotate as shown by arrows B and C, thereby causing the developer in the developing device l to rotate as indicated by arrows d,
It flows like e, f.
１４は、現像剤の流れを規制する流れ規制板。14 is a flow regulating plate that regulates the flow of developer.
１５は、現像ローラ１３の表面に付着して現像部に搬送
される現像剤のうち、一定の層厚より厚い部分をかき落
とすためのブレードである。Reference numeral 15 denotes a blade for scraping off a portion thicker than a certain layer thickness of the developer adhered to the surface of the developing roller 13 and conveyed to the developing section.
現像器ｌの底部付近には、現像剤の流れの圧力を検出す
るための高分子圧電板３が、現像ローラ１３と攪拌器２
との間付近の位置に配置されている。ただし、この高分
子圧電板３の配置位置は、現像器１内の現像剤の流れの
圧力を検出するのに適した位置ならばどこでも−よい。Near the bottom of the developing device l, a polymer piezoelectric plate 3 for detecting the pressure of the developer flow is installed between the developing roller 13 and the agitator 2.
It is located near the However, the polymer piezoelectric plate 3 may be placed at any position suitable for detecting the pressure of the developer flow within the developing device 1.
また、高分子圧電板３は、感光ドラム２１の軸方向の中
間位置に一つだけ設けてもよいし、軸方向に沿って複数
個配設してもよい。そして、複数個の高分子圧電板３の
各検出値の平均値に基づいて制御を行うようにしてもよ
い。Furthermore, only one polymer piezoelectric plate 3 may be provided at an intermediate position in the axial direction of the photosensitive drum 21, or a plurality of polymer piezoelectric plates 3 may be provided along the axial direction. Then, control may be performed based on the average value of each detection value of the plurality of polymer piezoelectric plates 3.
さらにまた、高分子圧電板３は、板面が現像剤の流れ方
向に対して約４５程度度傾けて配置してもよいし、現像
器ｌの底板にフランジ板などを取り付けて、そこに貼着
固定してもよい。Furthermore, the polymer piezoelectric plate 3 may be arranged so that the plate surface is inclined at an angle of approximately 45 degrees with respect to the flow direction of the developer, or a flange plate or the like may be attached to the bottom plate of the developer l and the plate may be attached thereto. It may be fixed.
第２図は、高分子圧電板３の構成を略本しており、３１
は、例えばぶつ化ビニリデン系の高分子圧電材料を薄膜
状に形成した圧電素子（圧電誘電体）、３２は、圧電素
子３１の両側に設けられた電極、３３は、各電極３２に
接続された出力端子である。FIG. 2 schematically shows the structure of the polymer piezoelectric plate 3.
3 is a piezoelectric element (piezoelectric dielectric material) formed of a thin film of a polymeric piezoelectric material such as vinylidene buttride, 32 is an electrode provided on both sides of the piezoelectric element 31, and 33 is a piezoelectric element connected to each electrode 32. It is an output terminal.
この高分子圧電板３に、圧力または張力などにより、伸
縮の応力またはずれの応力などが加わると、圧電素子３
１内に分極電荷３０か生し、その応力に対応した電位か
出力端子３３において検出される。When stress of expansion and contraction or stress of displacement is applied to this polymer piezoelectric plate 3 due to pressure or tension, the piezoelectric element 3
A polarized charge 30 is generated within the device 1, and a potential corresponding to the stress is detected at the output terminal 33.
第１図に戻って、４は、高分子圧電板３からの出力電圧
を入力して、攪拌器２のモータの回転を制御する制御部
である。この制御部４においては、高分子圧電板３から
の入力電位が高くなったら攪拌器２の回転を速くし、逆
に高分子圧電板３からの入力電位が低くなったら、攪拌
器２の回転を遅くする。Returning to FIG. 1, reference numeral 4 denotes a control unit that inputs the output voltage from the polymer piezoelectric plate 3 and controls the rotation of the motor of the stirrer 2. In this control section 4, the rotation of the stirrer 2 is increased when the input potential from the polymer piezoelectric plate 3 becomes high, and conversely, when the input potential from the polymer piezoelectric plate 3 becomes low, the rotation of the stirrer 2 is increased. slow down.
したがって、現像剤の帯電量が小さくなりすぎて現像剤
の流れが速くなったときには、攪拌器２の回転数が上が
って現像剤の帯電量が上げられ、逆に、現像剤の帯電量
が大きくなりすぎて現像剤の流れが遅くなったときには
、攪拌器２の回転数が下って現像剤の帯電量が下げられ
る。このようにして、現像剤の帯電量が常に適正な範囲
内にコントロールされる。Therefore, when the amount of charge on the developer becomes too small and the flow of the developer becomes faster, the rotational speed of the agitator 2 increases to increase the amount of charge on the developer, and conversely, the amount of charge on the developer increases. When the flow of the developer becomes too slow, the rotational speed of the agitator 2 is reduced to reduce the amount of charge of the developer. In this way, the amount of charge on the developer is always controlled within an appropriate range.
なお、上記実施例においては現像剤として二成分現像剤
を用いたが、本発明はそれに限定されるものではなく、
−成分現像剤その他の現像剤を用いたものでもよい。Although a two-component developer was used as the developer in the above example, the present invention is not limited thereto.
- A component developer or another developer may be used.
本発明の像形成装置の現像剤攪拌装置によれば、現像器
内の現像剤の流れの圧力を検出することによって、現像
剤攪拌手段の動作が制御され、それによって現像剤の帯
電量を常に一定範囲内にコントロールすることができる
ので、安定した良質の画像を得ることができる優れた効
果を有する。According to the developer stirring device of the image forming apparatus of the present invention, the operation of the developer stirring means is controlled by detecting the pressure of the flow of developer in the developing device, thereby constantly controlling the amount of charge of the developer. Since it can be controlled within a certain range, it has the excellent effect of being able to obtain stable, high-quality images.
そして、高分子圧電素子を用いることよって、現像剤流
圧検出手段を容易に小型に構成することができ、現像器
内に支障なく配置することができる。By using the polymer piezoelectric element, the developer flow pressure detection means can be easily constructed in a small size and can be placed within the developing device without any trouble.
図中、 ■・・・現像器、 ２・・・現像剤攪拌手段、 ３−・・現像剤流圧検出手段、 ４−・・攪拌制御手段。In the figure, ■...Developer, 2...Developer stirring means, 3-...Developer flow pressure detection means, 4--Stirring control means.
Claims (1)
（１）と、 上記現像器（１）内において現像剤を攪拌するための現
像剤攪拌手段（２）と、 上記現像器（１）内において現像剤の流れの圧力を検出
するための現像剤流圧検出手段（３）と、上記現像剤流
圧検出手段（３）から検出信号を入力して、上記現像剤
攪拌手段（２）の動作を制御するための制御信号を出力
する攪拌制御手段（４）とを設けたことを 特徴とする像形成装置の現像剤攪拌装置。 ２、上記現像剤流圧検出手段（３）として、高分子圧電
材料を薄膜状に形成した高分子圧電素子が用いられてい
る請求項第１項記載の像形成装置の現像剤攪拌装置。[Scope of Claims] 1. A developing device (1) containing a developer made of chargeable fine powder, and a developer stirring means (2) for stirring the developer in the developing device (1). and inputting a detection signal from the developer flow pressure detection means (3) for detecting the pressure of the flow of developer in the developer device (1), and the developer flow pressure detection means (3). A developer stirring device for an image forming apparatus, comprising: stirring control means (4) for outputting a control signal for controlling the operation of the developer stirring means (2). 2. The developer stirring device for an image forming apparatus according to claim 1, wherein a polymer piezoelectric element made of a polymer piezoelectric material formed into a thin film is used as the developer flow pressure detecting means (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2072339A JP2774656B2 (en) | 1990-03-20 | 1990-03-20 | Developer stirring device for image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2072339A JP2774656B2 (en) | 1990-03-20 | 1990-03-20 | Developer stirring device for image forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03271780A true JPH03271780A (en) | 1991-12-03 |
| JP2774656B2 JP2774656B2 (en) | 1998-07-09 |
Family
ID=13486442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2072339A Expired - Fee Related JP2774656B2 (en) | 1990-03-20 | 1990-03-20 | Developer stirring device for image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2774656B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014016557A (en) * | 2012-07-11 | 2014-01-30 | Fuji Xerox Co Ltd | Developer deterioration determination device and program |
-
1990
- 1990-03-20 JP JP2072339A patent/JP2774656B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014016557A (en) * | 2012-07-11 | 2014-01-30 | Fuji Xerox Co Ltd | Developer deterioration determination device and program |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2774656B2 (en) | 1998-07-09 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |