JPH04101181A - Transfer charger for electrophotographic printer - Google Patents

Transfer charger for electrophotographic printer

Info

Publication number
JPH04101181A
JPH04101181A JP21875690A JP21875690A JPH04101181A JP H04101181 A JPH04101181 A JP H04101181A JP 21875690 A JP21875690 A JP 21875690A JP 21875690 A JP21875690 A JP 21875690A JP H04101181 A JPH04101181 A JP H04101181A
Authority
JP
Japan
Prior art keywords
charger
photosensitive drum
paper
roller
transfer
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
Application number
JP21875690A
Other languages
Japanese (ja)
Inventor
Nobuhiro Tsuchida
土田　悦弘
Junichi Chiba
純一 千葉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
NEC Engineering Ltd
Original Assignee
NEC Corp
NEC Engineering Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp, NEC Engineering Ltd filed Critical NEC Corp
Priority to JP21875690A priority Critical patent/JPH04101181A/en
Publication of JPH04101181A publication Critical patent/JPH04101181A/en
Pending legal-status Critical Current

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Landscapes

  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)

Abstract

PURPOSE:To prevent a paper in the middle of transferring from separating from the surface of a photosensitive drum and slipping of the surface of the photosensitive drum and to decrease the faulty transfer and the printing blur by executing transfer while the paper is pressed to the photosensitive drum by a charger roller which is electrostatically charged. CONSTITUTION:A transfer charger 2 is constituted so that a hollow charger roller 2a made of insulating member is rotatably attached in a charger case 2b and a charger wire 2c is allowed to pass through the center of the roller 2a. Then, the charger 2 is disposed below the photosensitive drum 1 and can freely rotate with the rotation of the drum 1 by making the roller 2a press- contact with the surface of the drum 1. The roller 2a which is electrostatically charged by corona discharge from the wire 2c comes in contact with the paper 3, so that the paper 3 is electrostatically charged. Thus, faulty transfer and printing blur caused by slip between the surface of the photosensitive drum and the paper in the middle of transferring are prevented.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は電子写真記録方式の画像形成装置に用いられる
転写チャージャに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transfer charger used in an electrophotographic image forming apparatus.

〔従来の技術〕[Conventional technology]

従来、電子写真プリンタの転写チャージャは、第３図に
示すように、コロナ放電を行うチャージャワイヤ４ａを
囲んだコの字形の板金４ｂがその開口部を感光ドラム１
側に向けて設置されている。また、感光ドラム１と転写
チャージャ４との間には隙間がおいており、その間を用
紙３が通過する。そして、用紙３はチャージャワイヤ４
ａからのコロナ放電を直接受けることにより帯電する構
成となっていた。Conventionally, in a transfer charger for an electrophotographic printer, as shown in FIG.
It is placed facing the side. Further, a gap is provided between the photosensitive drum 1 and the transfer charger 4, and the paper 3 passes through the gap. And paper 3 is charger wire 4
It was designed to be charged by directly receiving corona discharge from a.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上述した従来の転写チャージャは、感光ドラムと転写チ
ャージャとの隙間を用紙が通過するため、感光ドラム表
面に用紙を押し付ける力がない。このため感光ドラム表
面から用紙が離れ、転写不良や転写中の感光ドラム表面
と用紙との間のすべりによる印字にじみが起こりやすい
という欠点がある。In the conventional transfer charger described above, since the paper passes through the gap between the photosensitive drum and the transfer charger, there is no force to press the paper against the surface of the photosensitive drum. For this reason, there is a drawback that the paper is separated from the photosensitive drum surface, resulting in poor transfer and printing smearing due to slippage between the photosensitive drum surface and the paper during transfer.

〔課題を解決するための手段〕[Means to solve the problem]

本発明の転写チャージャは、感光ドラム表面に圧接し、
且つ、回転自在に設けたチャージャローラを有している
。The transfer charger of the present invention is in pressure contact with the surface of the photosensitive drum,
Moreover, it has a charge roller that is rotatably provided.

〔実施例〕〔Example〕

次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.

第１図は本発明の一実施例を示す断面図である。FIG. 1 is a sectional view showing one embodiment of the present invention.

第２図は本発明の転写チャージャを示す斜視図である。FIG. 2 is a perspective view showing the transfer charger of the present invention.

第１図及び第２図において、転写チャージャ２はチャー
ジャケース２ｂ内に絶縁部材から成る中空のチャージャ
ローラ２ａが回転自在に取り付けられ、チャージャロー
ラ２ａの中心にチャージャワイヤ２ｃが通された構成と
なっている。1 and 2, the transfer charger 2 has a structure in which a hollow charge roller 2a made of an insulating material is rotatably attached in a charger case 2b, and a charge wire 2c is passed through the center of the charger roller 2a. ing.

また、転写チャージャ２は感光ドラム１の下方に配設さ
れ、チャージャローラ２ａが感光ドラム１の表面に圧接
して、感光ドラム１の回転に伴って自由に回転すること
ができる。そして、チャージャワイヤ２ｃからのコロナ
放電によって帯電したチャージャローラ２ａが用紙３に
接することにより、用紙３を帯電させることができる。Further, the transfer charger 2 is disposed below the photosensitive drum 1, and the charger roller 2a is in pressure contact with the surface of the photosensitive drum 1, so that it can freely rotate as the photosensitive drum 1 rotates. Then, the charger roller 2a charged by the corona discharge from the charger wire 2c comes into contact with the paper 3, so that the paper 3 can be charged.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明は、帯電したチャージャロー
ラが用紙を感光ドラムに押し付けながら転写を行なうこ
とにより、転写中の用紙の感光ドラム表面からの離れ及
び感光ドラム表面とのすべりを防ぎ、転写不良や印字を
減少できる効果がある。As explained above, in the present invention, a charged charger roller performs transfer while pressing the paper against the photosensitive drum, thereby preventing the paper from separating from the photosensitive drum surface and slipping against the photosensitive drum surface during transfer, thereby preventing transfer failures. This has the effect of reducing printing and printing.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の一実施例を示す断面図、第２図は本発
明の転写チャージャを示す斜視図、第３図は従来例を示
す断面図である。 １・・・感光ドラム、２・・・転写チャージャ、２ａ・
・・チャージャローラ、２ｂ・・・チャージャケース、
２Ｃ・・・チャージャワイヤ、３・・・用紙。FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a perspective view showing a transfer charger of the present invention, and FIG. 3 is a sectional view showing a conventional example. 1... Photosensitive drum, 2... Transfer charger, 2a.
...Charger roller, 2b...Charger case,
2C...Charger wire, 3...Paper.

Claims (1)

【特許請求の範囲】[Claims] 感光ドラム上のトナー像を用紙に転写する転写チャージ
ャにおいて、前記感光ドラム表面に圧接し、且つ、回転
自在に設けたチャージャローラを有することを特徴とす
る電子写真プリンタの転写チャージャ。A transfer charger for an electrophotographic printer that transfers a toner image on a photosensitive drum onto a sheet of paper, the transfer charger comprising a charger roller that is in pressure contact with the surface of the photosensitive drum and is rotatably provided.
JP21875690A 1990-08-20 1990-08-20 Transfer charger for electrophotographic printer Pending JPH04101181A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21875690A JPH04101181A (en) 1990-08-20 1990-08-20 Transfer charger for electrophotographic printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21875690A JPH04101181A (en) 1990-08-20 1990-08-20 Transfer charger for electrophotographic printer

Publications (1)

Publication Number Publication Date
JPH04101181A true JPH04101181A (en) 1992-04-02

Family

ID=16724917

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21875690A Pending JPH04101181A (en) 1990-08-20 1990-08-20 Transfer charger for electrophotographic printer

Country Status (1)

Country Link
JP (1) JPH04101181A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5424818A (en) * 1992-11-26 1995-06-13 Mita Industrial Co., Ltd. Toner image transferring apparatus and positional arrangement of conveying roller
US6198900B1 (en) 1998-02-03 2001-03-06 Sharp Kabushiki Kaisha Charge supply device for charging bodies in image forming apparatus and the like

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5424818A (en) * 1992-11-26 1995-06-13 Mita Industrial Co., Ltd. Toner image transferring apparatus and positional arrangement of conveying roller
US6198900B1 (en) 1998-02-03 2001-03-06 Sharp Kabushiki Kaisha Charge supply device for charging bodies in image forming apparatus and the like

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