JPS6114047Y2 - - Google Patents
Info
- Publication number
- JPS6114047Y2 JPS6114047Y2 JP17653778U JP17653778U JPS6114047Y2 JP S6114047 Y2 JPS6114047 Y2 JP S6114047Y2 JP 17653778 U JP17653778 U JP 17653778U JP 17653778 U JP17653778 U JP 17653778U JP S6114047 Y2 JPS6114047 Y2 JP S6114047Y2
- Authority
- JP
- Japan
- Prior art keywords
- electrometer
- photoreceptor
- electrode
- potential
- floating
- 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.)
- Expired
Links
- 108091008695 photoreceptors Proteins 0.000 claims description 16
- 238000005259 measurement Methods 0.000 claims description 2
- 238000007664 blowing Methods 0.000 claims 1
- 239000000843 powder Substances 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 3
- 238000001514 detection method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Description
【考案の詳細な説明】
この考案は感光体表面電位を検出する電位計の
電極の周囲にエアカーテンを設けて電位計の電極
側へ浮遊粉体などが付着するのを防止した静電複
写機の電位測定装置に関する。[Detailed description of the invention] This invention is an electrostatic copying machine in which an air curtain is provided around the electrode of the electrometer that detects the surface potential of the photoreceptor to prevent floating powder from adhering to the electrode side of the electrometer. The present invention relates to a potential measuring device.
従来静電複写機には、感光体の表面電位を検出
して、帯電レベルが一定となるよう帯電器の帯電
量を制御するための電位測定装置が設けられてお
り、通常感光体の近傍に電位計の電極を設けて感
光体の表面電位を検出している。このため感光体
の周辺に浮遊するトナーなどの浮遊粉体が上記電
位計の電位に吸引されて付着し、電極が短期間で
汚損されて正確な電位の測定がなし得ない欠点が
あつた。 Conventional electrostatic copying machines are equipped with a potential measuring device that detects the surface potential of the photoreceptor and controls the amount of charge on the charger so that the charge level remains constant. Electrometer electrodes are provided to detect the surface potential of the photoreceptor. For this reason, floating powder such as toner floating around the photoreceptor is attracted to the potential of the electrometer and adheres thereto, resulting in the electrode being contaminated in a short period of time, making it impossible to accurately measure the potential.
この考案はかかる従来の欠点を除去する目的で
なされたもので、感光体の表面電位を検出する電
位計の電極の周囲にエアカーテンを形成して、感
光体の周辺に浮遊する浮遊粉体が電位計の電極へ
吸引付着されるのを阻止するようにした静電複写
機の電位測定装置を提供して、常に精度の高い表
面電位の測定を可能にしたものである。 This invention was made with the aim of eliminating such conventional drawbacks, and by forming an air curtain around the electrode of an electrometer that detects the surface potential of the photoreceptor, floating powder floating around the photoreceptor can be prevented. The present invention provides a potential measuring device for an electrostatic copying machine that prevents the surface potential from being attracted to the electrode of an electrometer, thereby making it possible to always measure the surface potential with high precision.
以下この考案を図示の一実施例について詳述す
る。図において１は図示しない静電複写機に設け
られたドラム状の感光体で、表面近傍に帯電器２
が設けられており、この帯電器２により感光体１
表面が正電位に帯電されるようになつている。 This invention will be described in detail below with reference to an illustrated embodiment. In the figure, 1 is a drum-shaped photoreceptor installed in an electrostatic copying machine (not shown), and a charger 2 is located near the surface.
is provided, and this charger 2 charges the photoreceptor 1.
The surface is charged to a positive potential.
３は上記感光体１の表面電位を検出すべく感光
体１の近傍に設置された電位計で、電極３ａを有
していると共に、電位計３の周囲は感光体１のみ
開口するフード状の導電性電極４により覆われて
いる。 Reference numeral 3 denotes an electrometer installed near the photoreceptor 1 in order to detect the surface potential of the photoreceptor 1, which has an electrode 3a and a hood-shaped hood around the electrometer 3 that opens only to the photoreceptor 1. It is covered with a conductive electrode 4.
上記導電性電極４はバイアスが印加されてい
て、上記帯電器２より浮遊した浮遊イオン５が積
極的にアースへ逃されるようになつていると共
に、上記導電性電極４内は通路６を介してブロワ
などの送風器７の吸入側へ接続されている。送風
器７の吐出側は通路８を介して上記電位計３内へ
接続されて、送風器７より圧送された空気が電位
計３の下部開口より導電性電極４内へ噴出するこ
とにより、電極３ａ周囲にエアカーテンが形成さ
れるようになつている。９は浮遊粉体、１０は現
像器である。 A bias is applied to the conductive electrode 4, so that floating ions 5 floating from the charger 2 are actively released to the ground, and the inside of the conductive electrode 4 is connected via a passage 6. It is connected to the suction side of an air blower 7 such as a blower. The discharge side of the blower 7 is connected to the electrometer 3 through a passage 8, and the air forced from the blower 7 is ejected from the lower opening of the electrometer 3 into the conductive electrode 4, thereby causing the electrode to An air curtain is formed around 3a. 9 is a floating powder, and 10 is a developing device.
この考案は以上詳述したように、電位計内より
空気を噴出して、電極の周囲にエアカーテンを形
成したことから、感光体の周辺に浮遊する浮遊粉
体が電極に付着して検出感度を妨げることがない
ので、常に精度の高い表面電位の測定が可能とな
る。また電位計を覆うように設けた導電性電極を
バイアスしておけば浮遊イオンが吸引されて積極
的にアースへ逃されることから、感光体の表面電
位の測定が浮遊イオンにより影響されるのを防止
することもできる。 As detailed above, this device blows air out from inside the electrometer to form an air curtain around the electrodes, which causes floating powder floating around the photoreceptor to adhere to the electrodes, increasing the detection sensitivity. Therefore, it is possible to always measure the surface potential with high accuracy. In addition, if the conductive electrode placed over the electrometer is biased, floating ions will be attracted and actively released to the ground, which will prevent the measurement of the surface potential of the photoreceptor from being affected by floating ions. It can also be prevented.
図面はこの考案の一実施例を示し、第１図は全
体的な説明図、第２図は電位計の拡大図である。
１は感光体、２は帯電器、３は電位計、３ａは
電極、７は送風器。
The drawings show an embodiment of this invention, with FIG. 1 being an overall explanatory view and FIG. 2 being an enlarged view of the electrometer. 1 is a photoreceptor, 2 is a charger, 3 is an electrometer, 3a is an electrode, and 7 is a blower.
Claims (1)
感光体１の表面近傍に設置した電位計３の電極３
ａで測定するものにおいて、上記電位計３に送風
器７を接続して、電位計３の近傍より吸引した空
気を上記電位計３内へ噴出することにより、電極
３ａの周囲にエアカーテンを形成してなる静電複
写機の電位測定装置。 The surface potential of the photoreceptor 1 charged by the charger 2 is
Electrode 3 of electrometer 3 installed near the surface of photoreceptor 1
In the case of measurement in step a, an air curtain is formed around the electrode 3a by connecting a blower 7 to the electrometer 3 and blowing air sucked in from the vicinity of the electrometer 3 into the electrometer 3. A potential measuring device for electrostatic copying machines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17653778U JPS6114047Y2 (en) | 1978-12-26 | 1978-12-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17653778U JPS6114047Y2 (en) | 1978-12-26 | 1978-12-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5595145U JPS5595145U (en) | 1980-07-02 |
| JPS6114047Y2 true JPS6114047Y2 (en) | 1986-05-01 |
Family
ID=29185163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17653778U Expired JPS6114047Y2 (en) | 1978-12-26 | 1978-12-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6114047Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4802525B2 (en) * | 2005-03-17 | 2011-10-26 | コニカミノルタビジネステクノロジーズ株式会社 | Image forming apparatus |
-
1978
- 1978-12-26 JP JP17653778U patent/JPS6114047Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5595145U (en) | 1980-07-02 |
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