JPH052351A - Paper carrying device - Google Patents
Paper carrying deviceInfo
- Publication number
- JPH052351A JPH052351A JP3029828A JP2982891A JPH052351A JP H052351 A JPH052351 A JP H052351A JP 3029828 A JP3029828 A JP 3029828A JP 2982891 A JP2982891 A JP 2982891A JP H052351 A JPH052351 A JP H052351A
- Authority
- JP
- Japan
- Prior art keywords
- paper
- sheet
- fixing
- brush
- roller
- 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
Landscapes
- Control Or Security For Electrophotography (AREA)
- Discharge By Other Means (AREA)
- Fixing For Electrophotography (AREA)
- Paper Feeding For Electrophotography (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
- Elimination Of Static Electricity (AREA)
- Handling Of Sheets (AREA)
- Accessory Devices And Overall Control Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はレーザプリンタ等の電子
写真記録装置の用紙搬送装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying device for an electrophotographic recording device such as a laser printer.
【０００２】[0002]
【従来の技術】従来、レーザプリンタ等の電子写真記録
装置では用紙カセットからカットシートを給紙ローラに
より給紙し、レジストローラにより、感光ドラム上のト
ナー像との転写タイミングを取り、用紙上にトナー像を
転写、加熱ローラにより該トナー像を用紙上に熱定着
し、排紙ローラにより本体外へ排出する構成となってい
る。2. Description of the Related Art Conventionally, in an electrophotographic recording apparatus such as a laser printer, a cut sheet is fed from a paper cassette by a paper feed roller, and a registration roller sets a transfer timing with a toner image on a photosensitive drum to form a sheet on the paper. The toner image is transferred, the toner image is heat-fixed on the sheet by the heating roller, and the sheet is discharged by the sheet discharging roller to the outside of the main body.
【０００３】近年のプリンタの技術動向としては、両面
印刷機能，多色印刷等、用紙上のトナー像を熱定着後、
更に用紙をレジストローラの前まで戻し、再度、印字サ
イクルを行なう機構を付加する製品が増えている。Recent technical trends of printers include double-sided printing function, multicolor printing, etc., after thermal fixing of a toner image on a sheet,
Furthermore, an increasing number of products are adding a mechanism for returning the paper to the front of the registration roller and again performing the printing cycle.
【０００４】尚、この種の装置としては、特許公開昭58
−35553 号等がある。A device of this type is disclosed in Japanese Patent Laid-Open No. Sho 58-58.
-35553 and so on.
【０００５】[0005]
【発明が解決しようとする課題】しかし、上記従来技術
は、加熱ローラ，加圧ローラと用紙の摩擦で発生する用
紙の帯電を除去する機能が排出口にしか設けておらず、
前述の両面印刷，多色印刷等を行なう場合、定着後の用
紙が搬送ガイドに付着したり、搬送ローラに巻き付いた
りして紙トラブルの原因になりやすい問題があった。However, in the above-mentioned prior art, the discharge port is provided only with the function of removing the electrostatic charge on the paper generated by the friction between the heating roller and the pressure roller and the paper.
When performing the above-described double-sided printing, multicolor printing, or the like, there is a problem that the fixed paper adheres to the conveyance guide or winds around the conveyance roller, which may cause a paper trouble.
【０００６】本発明は上記従来技術の問題点に鑑み、用
紙の排出口と定着部の間に用紙の除電を行なう機能を有
する用紙搬送装置を提供することにある。In view of the above-mentioned problems of the prior art, the present invention provides a sheet conveying device having a function of removing electricity from a sheet between a sheet discharge port and a fixing section.
【０００７】[0007]
【課題を解決するための手段】上記目的は、加熱ローラ
を通過後、用紙に金属細線で構成された除電ブラシを接
触させ用紙の除電を行なうことで達成される。The above-mentioned object is achieved by discharging the paper by passing it through a heating roller and then contacting the paper with a static elimination brush composed of thin metal wires.
【０００８】[0008]
【作用】定着部で用紙は高温で加熱され、用紙内の水分
が蒸発し、かつ、加熱ローラと加圧ローラとの摩擦によ
って用紙が高圧に帯電するが、定着後、金属細線で構成
された除電ブラシと接触することにより、用紙に帯電し
ていた電荷は除電ブラシを通して放電する。その結果、
紙ガイドや搬送ローラに用紙が付着したり、巻き付いた
りすることがなく、用紙帯電によるジャム等の紙トラブ
ルを防止することができる。In the fixing unit, the paper is heated at a high temperature to evaporate the moisture in the paper, and the paper is charged to a high voltage due to the friction between the heating roller and the pressure roller. By contacting the static elimination brush, the electric charge charged on the sheet is discharged through the static elimination brush. as a result,
It is possible to prevent a paper trouble such as a jam due to the electrification of the paper without the paper adhering to or winding around the paper guide or the conveyance roller.
【０００９】[0009]
【実施例】以下、本発明の一実施例を図１，図２により
説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.
【００１０】まず、図２により本発明によるレーザプリ
ンタの一例を説明する。First, an example of the laser printer according to the present invention will be described with reference to FIG.
【００１１】紙カセット１１から給紙ローラ１２によ
り、給紙，搬送された用紙は、レジストローラ１３によ
り、搬送タイミングをあわせ、感光ドラム１４上に形成
されたトナー像を転写され、加熱ローラ１，加圧ローラ
２により、該トナー像を用紙上に熱定着される。熱定着
後、用紙は搬送切替えガイド４を経て、両面印刷のため
の用紙反転機構部１５にはいる。用紙反転後、用紙は裏
面給紙口１５ａより再度レジストローラを経て、裏面印
刷を行なう。裏面定着後、用紙は搬送切替えガイド１
４，排紙装置１０を経て、排紙トレー８上に排出される
構成となっている。次に図１により、本発明による用紙
搬送装置の詳細について説明する。The sheet fed and conveyed from the sheet cassette 11 by the sheet feeding roller 12 is transferred by the registration roller 13 to the toner image formed on the photosensitive drum 14 at the same conveyance timing, and the heating roller 1, The pressure roller 2 thermally fixes the toner image on the sheet. After heat fixing, the paper passes through the conveyance switching guide 4 and enters the paper reversing mechanism section 15 for double-sided printing. After reversing the paper, the paper is printed on the back surface through the registration rollers from the back paper supply port 15a again. After fixing on the back side, the paper is transported to the switching guide 1
4, the paper is discharged onto the paper discharge tray 8 via the paper discharge device 10. Next, the details of the sheet conveying apparatus according to the present invention will be described with reference to FIG.
【００１２】定着装置では、未定着トナーを用紙上に加
熱定着するために、加熱ローラ１，加圧ローラ２の間に
用紙を進行させることで定着工程をおこなう。加熱ロー
ラ１はアルミニウムの金属ローラにテフロンをコーティ
ングした構成となっており、内部のヒータ５により、通
常、中速形レーザプリンタ（Ａ４出力２０〜２５枚／分
程度）では、１７０〜２００℃程度に加熱される。又、
この加熱ローラ１に圧接される、加圧ローラ２は芯金に
シリコンゴムを成形した構成となっており、前述の通常
の中速形レーザプリンタでは、ニップ幅３〜５ｍｍ程度
になるように加熱ローラ１に圧接されている。In the fixing device, in order to heat and fix the unfixed toner on the sheet, the sheet is advanced between the heating roller 1 and the pressure roller 2 to perform the fixing step. The heating roller 1 has a structure in which a metal roller made of aluminum is coated with Teflon. Due to the internal heater 5, a medium speed type laser printer (A4 output 20 to 25 sheets / minute) normally has a temperature of about 170 to 200 ° C. To be heated. or,
The pressure roller 2, which is pressed against the heating roller 1, has a structure in which a silicon rubber is molded on a core metal. In the above-described normal medium-speed laser printer, the nip width is about 3 to 5 mm. It is pressed against the roller 1.
【００１３】以上のような定着装置を矢印の方向から用
紙が通過する際、用紙は加熱され用紙内部の水分が急激
に蒸発し、乾燥すると共に加熱ローラ１，加圧ローラ２
との摩擦により用紙は摩擦帯電する。この帯電量は数ｋ
Ｖに達し、絶縁性の高いプラスチツク製の用紙搬送ガイ
ド１６や排紙トレー８、又、排出された用紙同士が吸着
しあい、紙ジャムや排紙整合不良を発生しやすい。その
ため定着後はすぐに用紙を排出するとともに、用紙排出
口９に用紙に帯電した電荷を取り除くための除電ブラシ
１７を設け、用紙が排出する時にこの除電ブラシ１７に
接触して、用紙の電荷を放電するようにしてある。When the paper passes through the fixing device as described above in the direction of the arrow, the paper is heated and the moisture in the paper is rapidly evaporated and dried, and the heating roller 1 and the pressure roller 2
The paper is frictionally charged due to the friction with. This charge is several k
When the voltage reaches V, the paper transport guide 16 and the paper discharge tray 8 made of plastic having high insulation and the discharged papers are attracted to each other, and paper jams and paper discharge alignment defects are likely to occur. Therefore, immediately after fixing, the sheet is discharged, and a discharge brush 17 for removing the electric charge charged on the sheet is provided at the sheet discharge port 9. When the sheet is discharged, the discharging brush 17 is contacted to remove the charge on the sheet. It is designed to discharge.
【００１４】しかし、前述の両面印刷機構により両面印
刷を行なう場合は、定着後、更に長い用紙搬送を伴うこ
とになり、帯電した用紙が用紙ガイド７等に付着しやす
く、紙ジャム等の紙トラブルを発生することが多い。そ
のための対策として用紙ガイド７を金属製あるいは導電
製のプラスチックで構成するなどの工夫を施してある
が、完全な除電対策とはなっておらず、また、低コスト
化，軽量化といった製品の設計方向にそぐわないものに
なっている。However, in the case of performing double-sided printing by the above-mentioned double-sided printing mechanism, a longer paper conveyance is required after fixing, and the charged paper is apt to adhere to the paper guide 7 or the like, and paper trouble such as paper jam occurs. Often occurs. As a countermeasure for this, the paper guide 7 is made of metal or conductive plastic, but it is not a complete static elimination measure, and the product design is low cost and lightweight. It does not fit the direction.
【００１５】本発明では、上記問題点を解決するため
に、定着装置６の直後に上記の除電ブラシ３を設け、定
着直後に用紙に帯電した電荷を取り除くことができる構
造とした。これにより、定着後の用紙搬送路で用紙帯電
による紙トラブルが発生することがない。従って、用紙
ガイド７を金属製あるいは導電製のプラスチックで構成
する必要がなく、一般のプラスチック等、低コスト、軽
量の材料を使って製作することができると共に、用紙排
出口９の除電ブラシ１７は削除することも可能である。In the present invention, in order to solve the above-mentioned problems, the above-mentioned charge-removing brush 3 is provided immediately after the fixing device 6 so that the electric charge on the paper can be removed immediately after fixing. As a result, the paper trouble due to the electrification of the paper does not occur in the paper conveyance path after fixing. Therefore, the paper guide 7 does not have to be made of metal or conductive plastic, and can be manufactured using a low cost and lightweight material such as general plastic, and the static elimination brush 17 of the paper discharge port 9 can be formed. It is also possible to delete.
【００１６】また、除電ブラシ３を定着装置６にとりつ
けてあるため、定着装置６をメンテナンスするときにあ
わせて除電ブラシ３も清掃、交換等のメンテナンスが容
易に行なえる。Further, since the destaticizing brush 3 is attached to the fixing device 6, the destaticizing brush 3 can be easily cleaned and replaced at the same time as the fixing device 6 is maintained.
【００１７】また、除電ブラシ３は用紙進行方向に対し
て鋭角（９０°以下）で取り付けてあるため、第２原図
用紙等の薄い用紙でも除電ブラシ３との接触による用紙
変形等のトラブル発生もない。Further, since the static elimination brush 3 is attached at an acute angle (90 ° or less) with respect to the sheet advancing direction, even thin paper such as the second original paper may cause trouble such as deformation of the sheet due to contact with the static elimination brush 3. Absent.
【００１８】[0018]
【発明の効果】以上の様に、本発明によれば、定着直後
に除電ブラシを取り付けることにより、両面印刷等、定
着後の用紙搬送において、用紙帯電による紙トラブル発
生率を従来の１／１０００程度からほぼ０にすることが
でき、用紙ガイドを低コスト、軽量で構成することがで
きる。As described above, according to the present invention, by attaching the static elimination brush immediately after fixing, the paper trouble occurrence rate due to the charging of the paper is 1/1000 of that of the conventional case in the paper conveyance after fixing such as double-sided printing. The degree can be set to about 0, and the paper guide can be constructed at low cost and light weight.
【００１９】また、除電ブラシを定着装置にとりつけて
あるため、定着装置をメンテナンスするときにあわせて
除電ブラシも清掃，交換等のメンテナンスが容易に行な
える。Further, since the destaticizing brush is attached to the fixing device, the destaticizing brush can be easily cleaned and replaced at the time of maintenance of the fixing device.
【図１】本発明による用紙搬送装置の一実施例を示す縦
断面図である。FIG. 1 is a vertical cross-sectional view showing an embodiment of a sheet conveying device according to the present invention.
【図２】本発明によるレーザプリンタの一実施例を示す
縦断面図である。FIG. 2 is a vertical sectional view showing an embodiment of a laser printer according to the present invention.
１…加熱ローラ、２…加圧ローラ、３…除電ブラシ、４
…搬送切替えガイド、５…ヒータ、６…定着装置、７…
用紙ガイド、８…排紙トレー、９…用紙排出口、１０…
排紙装置、１１…紙カセット、１２…給紙ローラ、１３
…レジストローラ、１４…感光ドラム、１５…用紙反転
機構部、１５ａ…裏面給紙口、１６…用紙搬送ガイド、
１７…除電ブラシ。1 ... Heating roller, 2 ... Pressure roller, 3 ... Static elimination brush, 4
... conveyance switching guide, 5 ... heater, 6 ... fixing device, 7 ...
Paper guide, 8 ... Paper ejection tray, 9 ... Paper ejection port, 10 ...
Paper discharge device, 11 ... Paper cassette, 12 ... Paper feed roller, 13
... Registration rollers, 14 ... Photosensitive drum, 15 ... Paper reversing mechanism section, 15a ... Back side paper feed port, 16 ... Paper transport guide,
17 ... Static elimination brush.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ６５Ｈ 29/00 9147−3Ｆ Ｇ０３Ｇ 15/00 １０３ 8004−2Ｈ １０８ 7369−2Ｈ Ｈ０５Ｆ 3/02 Ｕ 7028−5Ｇ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI Technical display location B65H 29/00 9147-3F G03G 15/00 103 8004-2H 108 7369-2H H05F 3/02 U 7028 -5G
Claims (3)
ローラと該加熱ローラに圧接される加圧ローラと該加熱
ローラから用紙を搬送するための搬送ローラを有する用
紙搬送装置において加熱ローラと用紙排出口の中間に用
紙除電機構を設けたことを特徴とする用紙搬送装置。1. A heating roller in a paper feeding device having a heating roller for fixing a toner image on a sheet, a pressure roller pressed against the heating roller, and a feeding roller for feeding the sheet from the heating roller. A sheet conveying device, which is provided with a sheet discharging mechanism in the middle of the sheet discharge port.
属細線で構成された除電ブラシを使用したことを特徴と
する用紙搬送装置。2. A sheet conveying device according to claim 1, wherein an electricity removing brush composed of a thin metal wire is used as the sheet electricity removing mechanism.
出口を含まない定着装置の用紙搬送路上に設けたことを
特徴とする用紙搬送装置。3. The sheet conveying device according to claim 2, wherein the static elimination brush is provided on the sheet conveying path of the fixing device which does not include the sheet discharge port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3029828A JPH052351A (en) | 1991-02-25 | 1991-02-25 | Paper carrying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3029828A JPH052351A (en) | 1991-02-25 | 1991-02-25 | Paper carrying device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH052351A true JPH052351A (en) | 1993-01-08 |
Family
ID=12286890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3029828A Pending JPH052351A (en) | 1991-02-25 | 1991-02-25 | Paper carrying device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH052351A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5666621A (en) * | 1995-06-30 | 1997-09-09 | Minolta Co., Ltd. | Sheet separation device, sheet separation method, image forming apparatus and image forming method |
| CN105644160A (en) * | 2016-03-18 | 2016-06-08 | 隗刚国 | Electrostatic elimination device used for high-speed digital printer |
-
1991
- 1991-02-25 JP JP3029828A patent/JPH052351A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5666621A (en) * | 1995-06-30 | 1997-09-09 | Minolta Co., Ltd. | Sheet separation device, sheet separation method, image forming apparatus and image forming method |
| CN105644160A (en) * | 2016-03-18 | 2016-06-08 | 隗刚国 | Electrostatic elimination device used for high-speed digital printer |
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