JP3056536B2 - Transfer device - Google Patents
Transfer deviceInfo
- Publication number
- JP3056536B2 JP3056536B2 JP3083506A JP8350691A JP3056536B2 JP 3056536 B2 JP3056536 B2 JP 3056536B2 JP 3083506 A JP3083506 A JP 3083506A JP 8350691 A JP8350691 A JP 8350691A JP 3056536 B2 JP3056536 B2 JP 3056536B2
- Authority
- JP
- Japan
- Prior art keywords
- transfer
- recording paper
- image
- image forming
- transfer device
- 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 - Fee Related
Links
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は複写機等の電子写真プロ
セスを利用した画像形成装置の作像工程に用いられる転
写装置の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a transfer device used in an image forming step of an image forming apparatus utilizing an electrophotographic process such as a copying machine.
【０００２】[0002]
【従来技術】電子写真プロセスを利用した複写機、プリ
ンタ、ファクシミリ装置等の画像形成装置にあっては、
一様に帯電した感光体上に原稿反射光その他の光学的な
画像情報を照射することによって感光体上に形成した静
電潜像を現像装置からのトナーによって可視像化した後
で、この可視像を記録紙上に転写、定着することによっ
て作像を行っている。2. Description of the Related Art In an image forming apparatus such as a copying machine, a printer, and a facsimile apparatus using an electrophotographic process,
The electrostatic latent image formed on the photoreceptor by irradiating the uniformly charged photoreceptor with original reflected light and other optical image information is visualized by toner from a developing device. An image is formed by transferring and fixing a visible image on recording paper.
【０００３】ところで、転写装置として用いられるコロ
ナ放電器の近傍の湿度が高い、或は記録紙の含有水分が
低いという条件下において、自動両面複写装置による両
面転写時に転写後の記録紙が定着前に画像形成装置内の
導電体部分に接触すると、記録紙及び未定着トナー上の
電荷が放電を起こす。放電によって一時に電荷が導電体
側に移動すると、このときの衝撃により記録紙上の未定
着トナーが振動して四方に飛び散り画質の低下を招来す
る。Under the condition that the humidity near the corona discharger used as the transfer device is high or the water content of the recording paper is low, the recording paper after the transfer is unfixed during the double-side transfer by the automatic double-sided copying machine. Then, when it comes into contact with the conductive portion in the image forming apparatus, electric charges on the recording paper and the unfixed toner cause discharge. When the electric charge moves to the conductor side by the discharge at one time, the unfixed toner on the recording paper vibrates due to the impact at this time, and scatters in all directions, thereby deteriorating the image quality.
【０００４】このような問題を解決する為、実開昭６０
−１０７９６４号公報には、図５に示すように像支持体
１に転写材１２を接触させ、この接触位置で転写材１２
にコロナ流を照射して、上記像支持体上の画像を転写材
に転写する転写装置７において、像支持体から分離直後
の転写材に対接してアースした除電針１５を設け、この
除電針１５と転写材との間に、除電針を転写材から遮断
する位置と開放する位置との間に移動可能な遮蔽部材を
設けた転写装置が開示されている。In order to solve such a problem, Japanese Utility Model Application
In Japanese Patent Application Laid-Open No. 107964/1992, a transfer material 12 is brought into contact with an image support 1 as shown in FIG.
The transfer device 7 transfers the image on the image support to the transfer material by irradiating the transfer material with the corona flow to the transfer material immediately after separation from the image support. A transfer device is disclosed in which a shielding member movable between a position where the static elimination needle is shielded from the transfer material and an open position is provided between the transfer material and the transfer material.
【０００５】しかしながら、この転写装置は転写装置近
傍の湿度や、転写材の水分値を夫々検知する手段と、検
知結果に基づいて遮蔽板を移動する手段等を必要とする
ため、部品点数の増大、制御プログラムの複雑化等によ
るコストアップを招来するという不具合があった。However, this transfer apparatus requires means for detecting the humidity near the transfer apparatus and the moisture value of the transfer material, and means for moving the shielding plate based on the result of the detection. However, there is a problem that the cost is increased due to a complicated control program.
【０００６】[0006]
【発明の目的】本発明は上記に鑑みてなされたものであ
り、感光体から可視像を転写した後定着前の記録紙上の
電荷が画像形成装置を構成する導電体に接触して放電す
ることに起因して発生する未定着トナーの飛び散りによ
る画質の低下を防止することができる転写装置を提供す
ることを目的としている。SUMMARY OF THE INVENTION The present invention has been made in view of the above, and after a visible image is transferred from a photosensitive member, electric charges on a recording sheet before fixing come into contact with a conductor constituting an image forming apparatus and are discharged. It is an object of the present invention to provide a transfer device capable of preventing a deterioration in image quality due to scattering of unfixed toner caused by the above.
【０００７】[0007]
【発明の構成】上記目的を達成するため本発明は、転写
帯電器によって感光体上に形成したトナー像を記録紙上
に転写せしめる電子写真プロセスを利用した画像形成装
置において、前記転写帯電器を構成する転写チャージャ
ケーシングの下流側側壁に設けた高抵抗転写用紙ガイド
板に除電毛を直接植毛したことを特徴としている。According to the present invention, there is provided an image forming apparatus utilizing an electrophotographic process in which a toner image formed on a photoreceptor by a transfer charger is transferred onto recording paper. The charge removal hairs are directly implanted on a high-resistance transfer paper guide plate provided on the downstream side wall of the transfer charger casing.
【０００８】以下、添付図面に示した好適な実施例に基
づいて本発明を詳細に説明する。Hereinafter, the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.
【０００９】図１は本発明の好適な一実施例を適用した
レーザプリンタの概略構成説明図であり、このレーザプ
リンタは、記録紙２０を収納するカセット２１と、カセ
ット２１から給紙された記録紙２０を感光体ベルト２３
を中心とした作像部へ供給するレジストローラ２２とを
備える。該作像部は、感光体ベルト２３と、帯電チャー
ジャ２４によって一様に帯電されたベルト２３上に光学
的な画像情報を照射する光書込み部２５と、露光によっ
て感光体ベルト上に形成された静電潜像上にトナーを塗
布して可視化する現像部２６と、該可視像を記録紙２０
上に転写する転写部（転写帯電器）２７と、転写を受け
た記録紙を定着する定着部２８とを有する。FIG. 1 is a schematic structural explanatory view of a laser printer to which a preferred embodiment of the present invention is applied. This laser printer includes a cassette 21 for storing recording paper 20 and a recording paper fed from the cassette 21. Paper 20 to photoreceptor belt 23
And a registration roller 22 for supplying the image to the image forming unit. The image forming section is formed on the photoreceptor belt by a photoreceptor belt 23, an optical writing section 25 for irradiating optical image information on the belt 23 uniformly charged by the charging charger 24, and exposure. A developing unit 26 for applying a toner on the electrostatic latent image to visualize the electrostatic latent image;
It has a transfer section (transfer charger) 27 for transferring the image thereon, and a fixing section 28 for fixing the transferred recording paper.
【００１０】図２は転写装置の要部を示す斜視図であ
り、図示のように感光体ベルトとほぼ同等の幅を有する
転写チャージャーケーシング２７ａの開口部側の一側縁
部には樹脂等の絶縁性材料から成る高抵抗用紙ガイド板
３０を接着、嵌着等の手段によって固定するとともに、
該高抵抗用紙ガイド板３０の外面には除電ブラシ３１を
接着等の手段によって固定する。除電ブラシ３１は板状
の基部３１ａと、その基部３１ａから伸びた多数の除電
毛３１ｂとから成り、除電毛３１ｂはベルト２３上を搬
送される記録紙裏面（トナー像転写面の裏面）に均一に
接触可能となるように突出長を設定する。又、除電毛３
１ｂが記録紙から受けた電荷を除電するために除電ブラ
シ３１はいずれかの手段によって機器本体等に接地され
る。FIG. 2 is a perspective view showing a main part of the transfer device. As shown in FIG. 2, one side edge of the transfer charger casing 27a having a width substantially equal to that of the photoreceptor belt is made of resin or the like. A high-resistance paper guide plate 30 made of an insulating material is fixed by means such as adhesion and fitting, and
An antistatic brush 31 is fixed to the outer surface of the high-resistance paper guide plate 30 by means such as bonding. The static elimination brush 31 includes a plate-shaped base 31a and a large number of static elimination bristles 31b extending from the base 31a. The protruding length is set so that it can be contacted. In addition, static elimination hair 3
The charge removal brush 31 is grounded to the apparatus body or the like by any means so that the charge received by the recording paper 1b from the recording paper is removed.
【００１１】除電毛３１ｂとしては、例えばＳＵＳ（ス
テンレス鋼材）等の導電性材料を刷毛状に構成したもの
を用いるとともに、毛先を通過しようとする記録紙面に
ほぼ直角に接触させることにより記録紙上の電荷を徐々
に除電するように構成する。As the neutralizing bristles 31b, for example, a conductive material such as SUS (stainless steel) or the like formed in a brush shape is used, and is brought into almost perpendicular contact with the recording paper surface which is going to pass through the bristle. Is configured to gradually remove the electric charge of the electric field.
【００１２】高抵抗ガイド板３０は記録紙を感光体ベル
トとの間で効率よく搬送するためのものであり、ポリカ
ーボネイト、ＡＢＳ樹脂、ＰＰＯ（ポリフェニレンオキ
サイド）樹脂等の絶縁性材料を用いる。The high-resistance guide plate 30 is for efficiently transporting the recording paper to and from the photosensitive belt, and uses an insulating material such as polycarbonate, ABS resin, PPO (polyphenylene oxide) resin, and the like.
【００１３】次に、図３は他の実施例であり、転写チャ
ージャケース２７ａ側縁に固定した高抵抗用紙ガイド３
０に除電ブラシを嵌着するための凹所３０ａを設けると
共にこの凹所３０ａに除電ブラシ３１の基部３１ａを嵌
着固定して通過する記録紙２０裏面に毛３１ｂ先端を均
一に接触せしめた構成が特徴的である。前記図１に示し
た実施例と比べて接着剤が不要であるために組み立て性
を高めることができる。なお、符号２７ｂはチャージワ
イヤである。FIG. 3 shows another embodiment, in which a high-resistance paper guide 3 fixed to the side edge of the transfer charger case 27a.
0, a concave portion 30a for fitting a static elimination brush is provided, and a base 31a of a static elimination brush 31 is fitted and fixed in the concave portion 30a so that the tips of the bristles 31b uniformly contact the back surface of the recording paper 20 passing therethrough. Is characteristic. Compared with the embodiment shown in FIG. 1, no adhesive is required, so that the assemblability can be improved. Reference numeral 27b is a charge wire.
【００１４】また、図４は本発明の実施例であり、高抵
抗用紙ガイド板自体に毛３１ｂを植毛形成した構成が特
徴的である。この実施例は高抵抗用紙ガイド板自体に植
毛して、高抵抗用紙ガイド板自体を除電ブラシとして兼
用しているので製造コスト及び組立性を更に向上するこ
とができる。FIG. 4 shows an embodiment of the present invention, which is characterized in that the hair 31b is implanted on the high-resistance paper guide plate itself. In this embodiment, since the high-resistance paper guide plate itself is planted and the high-resistance paper guide plate itself is also used as a discharging brush, the manufacturing cost and the assembling property can be further improved.
【００１５】以上の各実施例によれば、多数の毛から成
る除電ブラシの先端部を転写装置を通過してきた記録紙
の裏面に均一に軽く接触（撫でる程度）させるようにし
たため、記録紙上の電荷を徐々に除電することが可能と
なる。このため、従来のように転写済の記録紙上の電荷
が定着前に画像形成装置内の導電体部分に接触して一時
に放電を起こすことを防止することができ、放電に起因
した未定着トナーの飛散と、それに起因した画質の低下
を確実に防止することができる。しかも、部品点数、コ
ストともに十分低く、特別な制御プログラムの付加も不
要であるため、実用性が極めて高い。According to each of the above-described embodiments, the tip of the charge removing brush made of a large number of hairs is uniformly and lightly contacted (stroked) with the back surface of the recording paper passing through the transfer device. It is possible to gradually remove charges. For this reason, it is possible to prevent the electric charge on the transferred recording paper from contacting the conductive portion in the image forming apparatus before fixing as in the related art, thereby causing a temporary discharge, and the unfixed toner due to the discharge can be prevented. And the deterioration of image quality due to the scattering can be reliably prevented. In addition, both the number of parts and the cost are sufficiently low, and it is not necessary to add a special control program.
【００１６】なお、上記実施例では主としてレーザプリ
ンタを例示したが、本発明は電子写真プロセスを利用し
た画像形成装置一般に適用可能である。また、感光体と
してベルト状のものを示したが、感光体ドラムを用いた
画像形成装置についても本発明は適用可能である。In the above embodiment, a laser printer is mainly exemplified, but the present invention is applicable to general image forming apparatuses utilizing an electrophotographic process. In addition, although a belt-shaped photosensitive member is shown, the present invention is also applicable to an image forming apparatus using a photosensitive drum.
【００１７】[0017]
【発明の効果】以上のように本発明によれば、感光体か
ら可視像を転写した後定着前の記録紙上の電荷が画像形
成装置を構成する導電体に接触して放電することに起因
して発生する未定着トナーの飛び散りによる画質の低下
を、コストアップを伴うことなく実現することができ
る。As described above, according to the present invention, after the visible image is transferred from the photoconductor, the electric charge on the recording paper before fixing is brought into contact with the conductor constituting the image forming apparatus and is discharged. As a result, it is possible to reduce the image quality due to the scattering of the unfixed toner that occurs without increasing the cost.
【図１】本発明の一実施例を適用した画像形成装置の概
略構成図。FIG. 1 is a schematic configuration diagram of an image forming apparatus to which an embodiment of the present invention is applied.
【図２】転写装置の要部構成を示す斜視図。FIG. 2 is a perspective view illustrating a main configuration of a transfer device.
【図３】他の例の構成を示す説明図。FIG. 3 is an explanatory diagram showing a configuration of another example.
【図４】さらに他の例の構成を示す説明図。FIG. 4 is an explanatory diagram showing a configuration of still another example.
【図５】従来例の構成説明図である。FIG. 5 is an explanatory diagram of a configuration of a conventional example.
２０・・・記録紙、２７・・・転写帯電器、２７ａ・・
・転写チャージャーケーシング、３０・・・高抵抗用紙
ガイド板、３１ｂ・・・毛20: recording paper, 27: transfer charger, 27a ...
・ Transfer charger casing, 30 ・ ・ ・ High resistance paper guide plate, 31b ・ ・ ・ Bristles
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G03G 15/16 G03G 15/14 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) G03G 15/16 G03G 15/14
Claims (1)
トナー像を記録紙上に転写せしめる電子写真プロセスを
利用した画像形成装置において、 前記転写帯電器を構成する転写チャージャケーシングの
下流側側壁に設けた高抵抗転写用紙ガイド板に除電毛を
直接植毛したことを特徴とする転写装置。1. An image forming apparatus using an electrophotographic process for transferring a toner image formed on a photoreceptor by a transfer charger onto recording paper, wherein the toner image is provided on a downstream side wall of a transfer charger casing constituting the transfer charger. and the neutralization hair high resistance transfer paper guide plate
A transfer device characterized by direct planting .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3083506A JP3056536B2 (en) | 1991-03-22 | 1991-03-22 | Transfer device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3083506A JP3056536B2 (en) | 1991-03-22 | 1991-03-22 | Transfer device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07230221A JPH07230221A (en) | 1995-08-29 |
| JP3056536B2 true JP3056536B2 (en) | 2000-06-26 |
Family
ID=13804369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3083506A Expired - Fee Related JP3056536B2 (en) | 1991-03-22 | 1991-03-22 | Transfer device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3056536B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4157668B2 (en) * | 2000-05-01 | 2008-10-01 | 株式会社リコー | Sheet-like medium transport device |
-
1991
- 1991-03-22 JP JP3083506A patent/JP3056536B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07230221A (en) | 1995-08-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |