JPS62194272A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPS62194272A JPS62194272A JP3697686A JP3697686A JPS62194272A JP S62194272 A JPS62194272 A JP S62194272A JP 3697686 A JP3697686 A JP 3697686A JP 3697686 A JP3697686 A JP 3697686A JP S62194272 A JPS62194272 A JP S62194272A
- Authority
- JP
- Japan
- Prior art keywords
- toner
- developing roller
- roller
- bias voltage
- 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
- 238000000034 method Methods 0.000 abstract description 2
- 108091008695 photoreceptors Proteins 0.000 description 7
- 239000004020 conductor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Landscapes
- Dry Development In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
（技術分野）
本発明は、複写機等に用いられる現像装置に関し、より
詳しくは現像ローラへのトナーの補給制御を行う制御機
構に特徴を有する現像装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a developing device used in a copying machine or the like, and more particularly to a developing device characterized by a control mechanism that controls the supply of toner to a developing roller.
（従来技術）
一成分系現像剤を用いる現像装置として、導電性の現像
ローラを感光体に接触させ、その表面を静電的に吸着保
持した現像剤をもって潜像像を可視化するようにした装
置は、磁気ブラシ現像装置と異なり、非現像時において
も現像ローラが感光体とともに回転し続けるため、現像
ローラから感光体に無駄なトナーが供給されるといった
問題を生じる。(Prior art) A developing device using a one-component developer, in which a conductive developing roller is brought into contact with a photoreceptor, and a latent image is visualized using the developer that is electrostatically attracted to the surface of the photoreceptor. Unlike a magnetic brush developing device, since the developing roller continues to rotate together with the photoreceptor even during non-development, there arises a problem that toner is wasted from the developing roller to the photoreceptor.
このためこの種の装置では、ホッパから現像ローラに至
るトナー補給路にシャッタもしくはブレート等よりなる
開閉機構を配設し、非現像時にはトナーの供給を断つよ
うにしているが、これがため構造が複雑化し、かつ保守
点検費が嵩むといった別の問題が生している。For this reason, in this type of device, an opening/closing mechanism consisting of a shutter or a plate is installed in the toner supply path from the hopper to the developing roller to cut off the toner supply when not developing, but this makes the structure complicated. This has led to other problems such as increased maintenance and inspection costs.
（目的）
本発明はかかる問題に鑑みてなされたもので、その目的
とするところは、簡単でしかも非現像時にトナーの補給
を完全に抑止することのできる新たな現像装置を揚供す
ることにある。(Purpose) The present invention was made in view of the above problem, and its purpose is to provide a new developing device that is simple and can completely prevent toner replenishment during non-developing periods. .
（構成）
すなわち本発明の特徴とするところは、現像剤を静電的
に担持して潜像担持体に搬送する導電性の現像ローラと
、現像剤を静電的に担持して上記現像ローラに供給する
導電性の弾性ローラと、上記両ローラのそれぞれに、現
像剤の静電吸引力を異にするように電位を付与するバイ
アス電圧印加手段と、現像時には上記現像ローラの現像
剤吸引力か上記弾性ローラのそれより大となるように、
非現像時には上記現像ローラの現像剤吸引力が上記弾性
ローラのそれより小となるように上記バイアス電圧印加
手段を制御する手段とを備えた現像装置にある。(Structure) That is, the present invention is characterized by: a conductive developing roller that electrostatically carries a developer and conveys it to a latent image carrier; a conductive elastic roller, a bias voltage applying means for applying a potential to each of the above rollers so as to make the electrostatic attraction force of the developer different, and a developer attraction force of the developing roller during development. or greater than that of the above elastic roller,
and means for controlling the bias voltage applying means so that the developer attraction force of the developing roller is smaller than that of the elastic roller during non-development.
以下に本発明の詳細を図示した実施例に基づいて説明す
る。The details of the present invention will be explained below based on illustrated embodiments.
図は本発明の一実施例を示し、図中符号１は感光体２に
圧接しで回転する導電性の現像ローラ、４は現像ローラ
］に接触してこのローラ１の表面にトナーを補給するた
めにホッパ５の開口部に設けられた導電性の弾性ローラ
で、これらの各ローラ１．４には電源１ｏと接続した後
述する制御装置７を介して現像時と非現像時にそれぞれ
トナー吸着力を異ならしめるようなバイアス電圧か印加
されるように構成されでいる。The figure shows an embodiment of the present invention. In the figure, reference numeral 1 is a conductive developing roller that rotates in pressure contact with a photoreceptor 2, and 4 is a developing roller that contacts the developing roller to supply toner to the surface of the roller 1. Toner adsorption force is applied to each of these rollers 1.4 at the time of development and during non-development through a control device 7, which will be described later, connected to a power source 1o. The structure is such that a bias voltage is applied that causes the two to differ.
すなわち、正帯電極性のトナーを用いたこの現像装置に
適用される制御装置７は、非現像時と現像時に接点を切
換制御するリレー制御回路１１を用いで、非現像時には
現像ローラ１にトナー吸引力の小さい例えばＯｖのバイ
アス電圧を、弾性ローラ４にはトナーの吸引力が大きい
例えば−３００Ｖのバイアス電圧を印加できるように、
また現像時には現像ローラ１にトナーの吸引力が大きい
例えば−３００Ｖのバイアス電圧を、弾性ローラ４には
トナーの吸引力が小ざい例えばｏｖのバイアス電圧を印
加できるように、現像ローラ１と弾性ローラ４及び接地
された導線と電源１゜に接続した導線との間に設けた各
接点８ａ、８ｂ、９ａ、９ｂに接片８．９を切換えで接
続できるように構成されでいる。That is, the control device 7 applied to this developing device using positively charged toner uses a relay control circuit 11 that switches and controls contacts during non-development and during development, and causes toner to be sucked into the developing roller 1 during non-development. A bias voltage with a small force, for example Ov, can be applied to the elastic roller 4, and a bias voltage with a large toner attraction force, for example -300V, can be applied to the elastic roller 4.
In addition, during development, a bias voltage of -300V, which has a large toner attraction force, can be applied to the developing roller 1, and a bias voltage of, for example, OV, which has a small toner attraction force, can be applied to the elastic roller 4, so that the developing roller 1 and the elastic roller The contact piece 8.9 can be connected to each contact point 8a, 8b, 9a, 9b provided between the conductor wire connected to the power supply 1° and the conductor wire connected to the power source 1° by switching.
なお図中符号は攪拌用羽根車を示している。Note that the reference numeral in the figure indicates a stirring impeller.
このよう（こ構成された実施例において、いま非現像状
態にある場合、現像ローラ１は接点８ａを介しで接地さ
れ、弾性ローラ４は接点９ａを介し電源１０から一３０
０ｖのバイアス電圧が印加されている。In the embodiment configured in this manner, when currently in a non-developing state, the developing roller 1 is grounded through the contact 8a, and the elastic roller 4 is connected to the power source 10 through the contact 9a.
A bias voltage of 0v is applied.
このため、弾性ローラ４に強く吸引されたトナーは、こ
れより低い吸着力をなす現像ローラ１に移動することな
く、したがって、感光体２には無駄なトナーが付着する
ことがない。Therefore, the toner that is strongly attracted to the elastic roller 4 does not move to the developing roller 1, which has a lower attraction force, and thus no unnecessary toner adheres to the photoreceptor 2.
次にプリントキーが入れられて複写プロセスが進行し始
めると、リレー制御回路７はこれ迄とは逆に接片８．９
を切換えで、現像ローラ１にはトナーの吸引力が大とな
るよう７３−３００Ｖのバイアス電圧をか電源１ｏがら
印加し、また弾性ローラ４にはこれよつ低いトナー吸引
力となるような接地電位となす。これにより、ホッパ５
内で正極゛ｉに摩擦帯電したトナーは、接地電位をなす
弾性ローラ４を介してトナー吸引力の大きな現像ローラ
１に補給されて現像に供される。Next, when the print key is inserted and the copying process begins to proceed, the relay control circuit 7 is switched to the contact piece 8.9, contrary to the previous one.
A bias voltage of 73-300V is applied to the developing roller 1 from the power supply 1o so that the toner attraction force is large, and a grounding voltage is applied to the elastic roller 4 so that the toner attraction force is lower. potential. As a result, hopper 5
The toner frictionally charged to the positive electrode i is supplied to the developing roller 1, which has a large toner attraction force, via the elastic roller 4, which has a ground potential, and is used for development.
なお、負の帯電極性を有するトナーを用いて現像する場
合は、電源１Ｑの極性を正となし、非現像時には、現像
ローラ１にトナー吸引力の小さいＯｖのバイアス電圧を
、弾性ローラ４にはトナー吸引力の大きな例えば＋３０
０Ｖのバイアス電圧を印加させてトナー６補給を阻止し
、現像時には、現像ローラ１にトナー吸引力の大きい例
えば＋３００Ｖのバイアス電圧を、弾性ローラ４にはト
ナー吸引力の小さいＯｖのバイアス電圧を加えてトナー
の補給を行う。Note that when developing using toner having negative charge polarity, the polarity of the power source 1Q is set to positive, and when not developing, a bias voltage of Ov with a small toner attraction force is applied to the developing roller 1, and a bias voltage of Ov, which has a small toner attraction force, is applied to the elastic roller 4. For example, +30 with high toner suction power.
A bias voltage of 0 V is applied to prevent the toner 6 from being replenished, and during development, a bias voltage of +300 V, which has a large toner attraction force, is applied to the developing roller 1, and a bias voltage of Ov, which has a small toner attraction force, is applied to the elastic roller 4. to replenish toner.
（効果）
以上述べたように本発明によれば、現像ローラ及び弾性
ローラに印加するバイアス電圧を、非現像時に現像ロー
ラの現像剤吸引力が弾′ｉローラのそれより小となるよ
うに、現像時には現像ローラの現像剤吸引力が弾性ロー
ラのそれより大となるように制御可能となしで、現像剤
に対する静電吸引力に差を与えて補給制御を行うように
しであるため、バイアス電圧印加制御手段のみによって
現像剤の供給停止を行うことが可能となり、この種の現
像装置の構造を大幅に簡素化するとともに、？ｉｌ実な
現像動作を行なわせることができる。(Effects) As described above, according to the present invention, the bias voltage applied to the developing roller and the elastic roller is adjusted such that the developer suction force of the developing roller is smaller than that of the bullet i roller during non-development. During development, the developer attraction force of the developing roller can be controlled to be greater than that of the elastic roller, and replenishment control is performed by giving a difference in the electrostatic attraction force to the developer, so the bias voltage It is now possible to stop the supply of developer using only the application control means, which greatly simplifies the structure of this type of developing device. A more realistic developing operation can be performed.
第１図は本発明の一実施例を示す装置の構成図である。
］・・・・現像ローラ ２・・・・感光体４・・
・・弾゛庄ローラ
７・・・・バイアス電圧制御装置
１０・・・・電源FIG. 1 is a block diagram of an apparatus showing an embodiment of the present invention. ]...Developing roller 2...Photoreceptor 4...
...Bullet pressure roller 7...Bias voltage control device 10...Power supply
Claims (1)
の現像ローラと、現像剤を静電的に担持して上記現像ロ
ーラに供給する導電性の弾性ローラと、上記両ローラの
それぞれに、現像剤の静電吸引力を異にするように電位
を付与するバイアス電圧印加手段と、現像時には上記現
像ローラの現像剤吸引力が上記弾性ローラのそれより大
となるように、非現像時には上記現像ローラの現像剤吸
引力が上記弾性ローラのそれより小となるように上記バ
イアス電圧印加手段を制御する手段とを備えた現像装置
。A conductive developing roller that electrostatically carries developer and conveys it to the latent image carrier, an electroconductive elastic roller that electrostatically carries developer and supplies it to the developing roller, and both of the above rollers. a bias voltage applying means for applying a potential to each of the developing rollers so as to make the electrostatic attraction force of the developer different; and means for controlling the bias voltage applying means so that the developer suction force of the developing roller is smaller than that of the elastic roller during non-development.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3697686A JPS62194272A (en) | 1986-02-20 | 1986-02-20 | Developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3697686A JPS62194272A (en) | 1986-02-20 | 1986-02-20 | Developing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62194272A true JPS62194272A (en) | 1987-08-26 |
Family
ID=12484787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3697686A Pending JPS62194272A (en) | 1986-02-20 | 1986-02-20 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62194272A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5897243A (en) * | 1995-04-28 | 1999-04-27 | Ricoh Company, Ltd. | Electrophotographic recording apparatus configured to switch a bias voltage in a developing unit |
| US6341204B1 (en) * | 1994-12-09 | 2002-01-22 | Canon Kabushiki Kaisha | Development apparatus employing toner supply roller comprising electrically conductive foamed material layer |
-
1986
- 1986-02-20 JP JP3697686A patent/JPS62194272A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6341204B1 (en) * | 1994-12-09 | 2002-01-22 | Canon Kabushiki Kaisha | Development apparatus employing toner supply roller comprising electrically conductive foamed material layer |
| US5897243A (en) * | 1995-04-28 | 1999-04-27 | Ricoh Company, Ltd. | Electrophotographic recording apparatus configured to switch a bias voltage in a developing unit |
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