JPH03160482A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH03160482A JPH03160482A JP1301284A JP30128489A JPH03160482A JP H03160482 A JPH03160482 A JP H03160482A JP 1301284 A JP1301284 A JP 1301284A JP 30128489 A JP30128489 A JP 30128489A JP H03160482 A JPH03160482 A JP H03160482A
- Authority
- JP
- Japan
- Prior art keywords
- developing unit
- high resistance
- image forming
- malfunction
- resistance member
- 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
- 239000002184 metal Substances 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 230000007257 malfunction Effects 0.000 abstract description 6
- 230000015556 catabolic process Effects 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 108091008695 photoreceptors Proteins 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
Landscapes
- Dry Development In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は複写機等の像形成装置に関し、特に、２成分現
像剤を用いた現像ユニットを使用する像形成装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an image forming apparatus such as a copying machine, and more particularly to an image forming apparatus using a developing unit using a two-component developer.
（発明の背景）
非磁性トナーと磁性キャリア（鉄の微粉）とがらなる２
或分現像剤は、トナーの摩擦帯電の制御が容易で現像性
が優れ、また、トナーに任意の色を付与できるとい゛う
特徴があり、レーザープリンタ等で使用されている。(Background of the invention) Non-magnetic toner and magnetic carrier (fine iron powder) are combined 2
Developers are used in laser printers and the like because they are characterized by easy control of triboelectric charging of toner, excellent developability, and the ability to impart any color to toner.
現像に際しては、磁性キャリアとトナーとを現像ユニッ
ト内で攪拌して混合した後、トナーを感光体ドラムの静
電潜像上に付着させ、転写紙に転写するようになってい
る。During development, the magnetic carrier and toner are stirred and mixed in a developing unit, and then the toner is deposited on the electrostatic latent image on the photoreceptor drum and transferred to transfer paper.
（発明が解決しようとする課題）
２或分現像剤を使用する現像ユニットが金属部材で構威
されている場合、この現像剤を攪ｆｆ混合（攪社帯Ｗ１
）させると、現像剤と共に現像ユニットの金属部材も帯
電し、過大電位に達する場合がある。この金属部材の周
辺に接地金属部があると、過大電荷により絶縁破壊に至
り放電する。(Problem to be Solved by the Invention) When the developing unit that uses a two-part developer is made of a metal member, this developer is stirred and mixed (agitated belt W1
), the metal members of the development unit are charged together with the developer, and may reach an excessive potential. If there is a grounded metal part around this metal member, the excessive charge will lead to dielectric breakdown and discharge.
第４図に示すように現像ユニットの電圧が徐々に上昇し
、ある電圧Ｖｌｈに達した時刻ｔｏにおいて放電が起こ
ったとすると、瞬時的な放電電流が流れる。このとき、
時間に対する変化率ｄｉ／ｄｔが大きければ大きいほど
他の電子機器とのカップリングが生じやすい。また、電
磁波や火花も生じやすい。一この放電等により、複写機
を統括的に制御しているコンピュータ回路の誤動作が生
しる危険性が高い。As shown in FIG. 4, if the voltage of the developing unit gradually increases and discharge occurs at time to when it reaches a certain voltage Vlh, an instantaneous discharge current flows. At this time,
The larger the rate of change di/dt with respect to time, the more likely coupling with other electronic devices will occur. It also tends to generate electromagnetic waves and sparks. - There is a high risk that this discharge etc. will cause a malfunction of the computer circuit that centrally controls the copying machine.
本発明は上述した従来技術の問題点に鑑みてなされたも
のであり、その目的は、金属製の現像ユニットおよび２
成分現像剤を使用する場合でもコンピュータ回路の誤動
作を確実に防止でき、信頼性の高い像形威装置を提供す
ることにある。The present invention has been made in view of the problems of the prior art described above, and its object is to provide a metal developing unit and two.
To provide a highly reliable image forming device that can reliably prevent malfunction of a computer circuit even when component developers are used.
（課題を解決するための手段）
本発明の像形成装置は、現像ユニットの少なくとも一部
が金属で構成されている像形威装置において、前記現像
ユニットの金属部と接地との間に高抵抗が介在している
ことを特徴とする。(Means for Solving the Problems) The image forming apparatus of the present invention is an image forming apparatus in which at least a part of the developing unit is made of metal, and has a high resistance between the metal part of the developing unit and the ground. It is characterized by the presence of
（作用）
現像剤の攪けにより電荷が蓄積し、現像ユニットの電位
が上昇すると、高抵抗を介して蓄積電荷が接地に少しず
つ逃げ、現像ユニットの電位は過大な電位に決して達せ
ず、放電、火花、電磁波の発生が防止される。(Function) When the developer is stirred, charges accumulate and the potential of the developing unit rises.The accumulated charges gradually escape to ground through high resistance, and the potential of the developing unit never reaches an excessive potential, causing discharge. , sparks, and electromagnetic waves are prevented.
また、高抵抗が介在しているため、現像ユニットが接地
され、現像剤の帯電が妨げられるという不都合が生じな
い。Further, since there is a high resistance, there is no problem that the developing unit is grounded and the charging of the developer is hindered.
（実施例）
次に、本発明の実施例について図面を参照して説明する
゛。(Example) Next, an example of the present invention will be described with reference to the drawings.
第１図は本発明の像形戊装置における現像部の摺成の一
例を示す図である。FIG. 1 is a diagram showing an example of the sliding structure of the developing section in the image forming apparatus of the present invention.
現像ユニットにおいて、現像剤瑠まりを構成する底部は
金属部材１からなる。In the developing unit, the bottom portion constituting a developer reservoir is made of a metal member 1.
ユニット内には、円筒状のスリーブ２が四転自Ｙ［に収
納され、このスリーブ２内にはＮ， Ｓ８ｔＭを有す
る磁器ロール３が設けられている。スリーブ２の外周面
には層規制片４が圧接され、スリーブ２に付着した現像
剤の層厚が所定の厚みとなるように規制される。Inside the unit, a cylindrical sleeve 2 is housed in a four-roller Y[, and within this sleeve 2 is provided a porcelain roll 3 having N and S8tM. A layer regulating piece 4 is pressed against the outer peripheral surface of the sleeve 2 to regulate the layer thickness of the developer adhered to the sleeve 2 to a predetermined thickness.
ユニット内には、さらに第１および第２の攪拌部材５．
６が設けられており、これらの部材の四転により２成分
現像剤Ｄは十分攪袢混合され、スリーブ２により付着搬
送される。感光体ドラム（像形成体）７上に付着した現
像剤Ｄによって静電潜像が現像される。現像時には、電
源８からスリーブ２に現像バイアスが供給されるように
なっている。なお、補給トナー容器９内のトナーＴは、
トナー補給ローラ１０の回転により現像ユニット内に供
給される。The unit further includes first and second stirring members 5.
6 are provided, and the two-component developer D is sufficiently stirred and mixed by the four-wheel rotation of these members, and the two-component developer D is adhered and conveyed by the sleeve 2. The electrostatic latent image is developed by the developer D adhering to the photoreceptor drum (image forming body) 7. During development, a developing bias is supplied from the power source 8 to the sleeve 2. Note that the toner T in the replenishment toner container 9 is
The toner is supplied into the developing unit by the rotation of the toner supply roller 10.
このような横威の現像ユニットと、隣接する接地金属部
材１１との間には、導電性ゴムからなる高抵抗部材ｌ２
が介在している。この高抵抗部材ｌ２は弾性を有してお
り、メーカーの製造工程において、現像ユニットを複写
機内に挿入すると、ｎ動的に圧接されるようになってい
る。この高抵抗部材ｌ２の介在により、現像ユニットの
金属部材１と接地金属部材１ｌとの間に電気的に高抵抗
Ｒが接続されたことになる。A high-resistance member l2 made of conductive rubber is placed between such a horizontal developing unit and the adjacent grounded metal member 11.
is intervening. This high-resistance member l2 has elasticity, and is designed to be dynamically pressed into contact with the developing unit when the developing unit is inserted into the copying machine during the manufacturer's manufacturing process. Due to the intervention of the high resistance member l2, a high resistance R is electrically connected between the metal member 1 of the developing unit and the ground metal member 1l.
このような溝或により、現像ユニットの帯電電荷は徐々
に逃がされ、第２図に示すように、現像ユニットの電圧
は絶縁破壊が生じて放電等が起こるレベル（Ｖ，ｈ）ま
で決して上昇しない。これにより、コンピュータ制御回
路の誤動作を確実に防止できる。Due to these grooves, the electrical charge of the developing unit is gradually released, and as shown in Figure 2, the voltage of the developing unit never rises to the level (V, h) where dielectric breakdown occurs and discharge occurs. do not. Thereby, malfunction of the computer control circuit can be reliably prevented.
第３図は現像ユニットの他の実施例の構威を示す図であ
る。FIG. 3 is a diagram showing the structure of another embodiment of the developing unit.
本実施例は、現像ユニットの内部に接地部材ｌ３を配設
し、この接地部材ｌ３と金属部材１との間に高抵抗体ｌ
４を接続したものである。このリークパスの存往により
、現像剤の攪拌ａ合に什う帯電電荷を逃がすことができ
、前掲の実施例と同様の効果が得られる。In this embodiment, a grounding member l3 is disposed inside the developing unit, and a high resistance element l3 is provided between the grounding member l3 and the metal member 1.
4 are connected. Due to the existence of this leak path, it is possible to release the electrical charge that occurs during agitation of the developer, and the same effect as in the above-mentioned embodiment can be obtained.
（発明の効果）
以上説明したように本発明は、現像ユニットの金属部と
接地間を高抵抗で接続することにより、帯電電位の上昇
を抑制して放電等の発生を防止でき、コンピュータ回路
の誤動作を防ぐことができる。(Effects of the Invention) As explained above, the present invention suppresses the increase in the charging potential and prevents the occurrence of discharge etc. by connecting the metal part of the developing unit and the ground with high resistance, thereby making it possible to prevent the occurrence of discharge etc. Malfunctions can be prevented.
このため、複写機等の像形成装置の信頼性の低下を防止
できる効果がある。Therefore, it is possible to prevent a decrease in reliability of an image forming apparatus such as a copying machine.
第１図は本発明の像形成装置における現像ユニットの一
実施例の構成を示す図、
第２図は第１図の実施例における現像ユニットの帯電に
よる電圧の上昇の様子を示す図、第３図は他の実施例の
構戊を示す図、
第４図は従来例の問題点を説明するための図である。
１・・・金属部材
３・・・磁気ロール
５．６・・・攪拌部材
８・・・電源
ＩＯ・・・トナー補給ローラ
ｌ２・・・高抵抗部材
ｌ４・・・高抵抗体
Ｔ・・・トナー
２・・・スリーブ
４・・・層規制片
７・・・感光体ドラム
９・・・補給トナー容器
１１・・・接地金属部材
ｌ３・・・接地部材
Ｄ・・・現像剤FIG. 1 is a diagram showing the configuration of an embodiment of the developing unit in the image forming apparatus of the present invention, FIG. 2 is a diagram showing how the voltage increases due to charging of the developing unit in the embodiment of FIG. 1, and FIG. The figure is a diagram showing the structure of another embodiment, and FIG. 4 is a diagram for explaining the problems of the conventional example. 1... Metal member 3... Magnetic roll 5.6... Stirring member 8... Power supply IO... Toner supply roller l2... High resistance member l4... High resistance element T... Toner 2... Sleeve 4... Layer regulating piece 7... Photosensitive drum 9... Replenishment toner container 11... Ground metal member l3... Ground member D... Developer
Claims (1)
像形成装置において、 前記現像ユニットの金属部と接地との間に高抵抗が介在
していることを特徴とする像形成装置。[Scope of Claims] An image forming apparatus in which at least a portion of a developing unit is made of metal, characterized in that a high resistance is interposed between the metal part of the developing unit and ground. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1301284A JPH03160482A (en) | 1989-11-20 | 1989-11-20 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1301284A JPH03160482A (en) | 1989-11-20 | 1989-11-20 | Image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03160482A true JPH03160482A (en) | 1991-07-10 |
Family
ID=17894976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1301284A Pending JPH03160482A (en) | 1989-11-20 | 1989-11-20 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03160482A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006154103A (en) * | 2004-11-26 | 2006-06-15 | Fuji Xerox Co Ltd | Image forming apparatus |
| JP2021056393A (en) * | 2019-09-30 | 2021-04-08 | コニカミノルタ株式会社 | Developing device and image forming apparatus |
-
1989
- 1989-11-20 JP JP1301284A patent/JPH03160482A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006154103A (en) * | 2004-11-26 | 2006-06-15 | Fuji Xerox Co Ltd | Image forming apparatus |
| JP4622484B2 (en) * | 2004-11-26 | 2011-02-02 | 富士ゼロックス株式会社 | Image forming apparatus |
| JP2021056393A (en) * | 2019-09-30 | 2021-04-08 | コニカミノルタ株式会社 | Developing device and image forming apparatus |
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