JP2000219387A - Electrophotographic device - Google Patents

Electrophotographic device

Info

Publication number
JP2000219387A
JP2000219387A JP2163099A JP2163099A JP2000219387A JP 2000219387 A JP2000219387 A JP 2000219387A JP 2163099 A JP2163099 A JP 2163099A JP 2163099 A JP2163099 A JP 2163099A JP 2000219387 A JP2000219387 A JP 2000219387A
Authority
JP
Japan
Prior art keywords
sheet
paper
path
curl
electrophotographic apparatus
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
JP2163099A
Other languages
Japanese (ja)
Inventor
Masahiro Yamazaki
正浩 山崎
Junji Shirakawa
順司 白川
Minoru Kiyono
稔 清野
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.)
Koki Holdings Co Ltd
Original Assignee
Hitachi Koki Co 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 Hitachi Koki Co Ltd filed Critical Hitachi Koki Co Ltd
Priority to JP2163099A priority Critical patent/JP2000219387A/en
Publication of JP2000219387A publication Critical patent/JP2000219387A/en
Pending legal-status Critical Current

Links

Landscapes

  • Counters In Electrophotography And Two-Sided Copying (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)

Abstract

PROBLEM TO BE SOLVED: To efficiently and effectively eliminate the curl generated by printing to the first surface of a sheet by providing, on a return passage, a curl correcting means for correcting the curl of the sheet carried on the return passage. SOLUTION: A sheet with a printed first surface fed to a return passage 12 is carried by a pair of carrying rollers 24, guided by a gate member 23, and sent between a guide member 21 and a cylindrical member (rubber roller) 22. The curl generated in the sheet in the process of the first surface printing is corrected by passing the sheet in a carrying passage protruding down to the return passage 12, which is formed by the guide member 21 and the rubber roller 22. The corrected sheet is traveled in the return passage 12 by the rubber roller 22, a pair of carrying rollers 25 and a pair of succeeding carrying rollers to feed the sheet again to a transfer part for the second surface printing.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、プリンタや複写機
などに代表される電子写真装置に関するものであり、特
に用紙の表裏両面に印刷を行えるようにした電子写真装
置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic apparatus represented by a printer, a copying machine, and the like, and more particularly to an electrophotographic apparatus capable of printing on both sides of a sheet.

【0002】[0002]

【従来の技術】図4を用いて従来技術を説明する。2. Description of the Related Art The prior art will be described with reference to FIG.

【0003】図4において1a,1b,1cは給紙部であ
り、用紙を収容している。2は感光ドラムで、図示しな
いコントローラからの信号に基づいて回転を始める。感
光ドラム2が回転を開始すると、コロナ帯電器3によっ
て感光ドラム2表面が均一に帯電される。帯電した感光
ドラム2には、露光装置4からの走査ビームにより静電
潜像が形成される。静電潜像は現像装置5の位置に到達
するとトナーによって現像され、感光ドラム2上にトナ
ー像として可視化される。こうして周知の電子写真プロ
セスにより形成されたトナー像は転写器6により給紙部
1a、1bまたは1cから送り出されてきた用紙に転写
される。7は定着装置であり、用紙に転写されたトナー
像を定着させる。8はフラップで、搬送される用紙の方
向を制御する。9は排紙部となる排紙トレーで、画像形
成が終了した用紙を積載収容する。
In FIG. 4, reference numerals 1a, 1b, and 1c denote sheet feeding units which store sheets. Reference numeral 2 denotes a photosensitive drum, which starts rotating based on a signal from a controller (not shown). When the photosensitive drum 2 starts rotating, the surface of the photosensitive drum 2 is uniformly charged by the corona charger 3. An electrostatic latent image is formed on the charged photosensitive drum 2 by a scanning beam from the exposure device 4. When the electrostatic latent image reaches the position of the developing device 5, the electrostatic latent image is developed by toner, and is visualized as a toner image on the photosensitive drum 2. The toner image formed by the well-known electrophotographic process is transferred by the transfer unit 6 to the sheet sent from the sheet feeding unit 1a, 1b, or 1c. A fixing device 7 fixes the toner image transferred to the sheet. Reference numeral 8 denotes a flap for controlling the direction of a sheet to be conveyed. Reference numeral 9 denotes a paper discharge tray serving as a paper discharge unit, which stacks and stores sheets on which image formation has been completed.

【0004】なお、以下の説明においては、便宜上、給
紙部1a,1b,1c−画像形成手段2,3,4,5,6,7
−排紙トレー9を連絡する用紙搬送路10を「送紙路」
と呼ぶ。11は引込み路で、前記画像形成手段に対し用
紙搬送方向下流側の送紙路10から分岐して設けられて
おり、フラップ8の切り替え制御により定着装置7から
送り出されてきた用紙を選択的に引き込む。12は戻し
路で、引込み路11の途中から分岐し、その終端を前記
画像形成手段に対し用紙搬送方向上流側の送紙路10に
合流させて設けられている。
In the following description, for convenience, the paper feed units 1a, 1b, 1c and the image forming means 2, 3, 4, 5, 6, 7
-The paper transport path 10 that communicates with the paper output tray 9 is referred to as
Call. Reference numeral 11 denotes a draw-in path, which is provided to branch off from the paper feed path 10 on the downstream side in the paper transport direction with respect to the image forming means, and selectively controls the flap 8 to switch the paper fed from the fixing device 7. Pull in. Reference numeral 12 denotes a return path, which branches off from the middle of the pull-in path 11, and is provided so that the terminal end thereof joins the paper feed path 10 on the upstream side in the sheet transport direction with respect to the image forming means.

【0005】従って、用紙の両面に画像記録を行う場合
は、定着装置7から送り出されてきた用紙を引込み路1
1へ引き込み、この引き込んだ用紙を戻し路12へ送り
出すことによって、片面記録済みの用紙を再び画像形成
手段に送り込み、これによって両面画像記録が実行され
る。
Therefore, when image recording is performed on both sides of the sheet, the sheet sent from the fixing device 7 is fed to the pull-in path 1.
1 and the drawn sheet is sent to the return path 12, so that the sheet on which single-side recording has been performed is sent again to the image forming means, whereby double-sided image recording is performed.

【0006】なお、図4において13,14はフラップ
8の前後に設けられた搬送ローラ対、15,16は引込
み路11上に設けられた正転/逆転切り替え可能な搬送
ローラ対、17は引込み路11に引き込まれた用紙を戻
し路12に送り出すか、あるいは再び送紙路10側へ戻
して排紙トレー9へ排紙させるかを切り替えるためのフ
ラップである。
In FIG. 4, reference numerals 13 and 14 denote a pair of transport rollers provided before and after the flap 8; 15, 16 a pair of transport rollers provided on the retraction path 11 which can be switched between forward and reverse rotation; This flap is used to switch between feeding the paper drawn into the path 11 to the return path 12 or returning the sheet to the paper feed path 10 again and discharging the sheet to the discharge tray 9.

【0007】[0007]

【発明が解決しようとする課題】ところで、図4に示す
レイアウトの電子写真装置の場合、定着装置7を通過し
た用紙は、定着装置7からの熱と圧力ならびに用紙搬送
路の経路構成によって曲げられ、カールが生じてしまう
ことが多い。このカールを帯びた用紙の裏面への印刷を
行うために、当該用紙を戻し路12を介して転写位置に
送り込んだ場合、用紙のカール面(凹面)が感光ドラム
2表面に接するため、用紙は感光ドラム2に巻き付きや
すくなる。
By the way, in the case of the electrophotographic apparatus having the layout shown in FIG. 4, the sheet passing through the fixing device 7 is bent by heat and pressure from the fixing device 7 and the path configuration of the sheet conveying path. In many cases, curling occurs. When the paper is sent to the transfer position via the return path 12 in order to perform printing on the back surface of the curled paper, the curl surface (concave surface) of the paper comes into contact with the surface of the photosensitive drum 2, so that the paper is It becomes easy to wind around the photosensitive drum 2.

【0008】カールが比較的小さい場合は、用紙は転写
器6の後段に設けられた剥離器18の電気的な力によっ
て感光ドラム2に巻き付くことなく搬送ベルト19側に
送られるが、カール量が大きくなると剥離器18の作用
だけで用紙を感光ドラム2から剥離させることが困難と
なり、結果として用紙ジャムが生じてしまうという欠点
があった。
When the curl is relatively small, the sheet is sent to the conveyor belt 19 side without being wound around the photosensitive drum 2 by the electric force of the peeler 18 provided at the subsequent stage of the transfer unit 6. When it becomes large, it becomes difficult to peel the sheet from the photosensitive drum 2 only by the action of the peeler 18, resulting in a drawback that the paper jam occurs.

【0009】本発明の目的は、用紙の第1面への印刷に
おいて生成されたカールを、効率よく且つ効果的に除去
し、両面印刷を円滑に行える電子写真装置を提供するこ
とにある。
SUMMARY OF THE INVENTION It is an object of the present invention to provide an electrophotographic apparatus capable of efficiently and effectively removing curls generated in printing on the first side of a sheet and performing two-sided printing smoothly.

【0010】[0010]

【課題を解決するための手段】上記の目的は、給紙部、
搬送される用紙上に画像を記録形成する画像形成手段お
よび画像記録後の用紙を収容する排紙部を連絡する送紙
路と、前記画像形成手段に対し用紙搬送方向下流側の送
紙路から分岐して設けられた引込み路と、前記引込み路
の途中から分岐し、その終端を前記画像形成手段に対し
用紙搬送方向上流側の送紙路に合流させてなる戻し路と
を有する電子写真装置において、前記戻し路に、戻し路
上を搬送される用紙のカールを矯正するカール矯正手段
を備えることにより達成される。
The object of the present invention is to provide a paper feeding unit,
An image forming means for recording and forming an image on the conveyed paper and a paper feed path for communicating a paper discharge unit for accommodating the image-recorded paper; and a paper feed path on the downstream side in the paper conveying direction with respect to the image forming means. An electrophotographic apparatus having a branch path provided therein, and a return path branching from the middle of the branch path and having its end joined to the paper feed path on the upstream side in the paper transport direction with respect to the image forming means. In the above, the present invention is achieved by providing the return path with a curl correcting means for correcting the curl of the sheet conveyed on the return path.

【0011】[0011]

【発明の実施の形態】以下、本発明の一実施例を図面を
用いて説明する。図において、図1は本発明の電子写真
装置を示す全体構成図、図2は本発明の電子写真装置に
適用される戻し路の要部側面図、図3は本発明の電子写
真装置に適用される戻し路の要部斜視図である。なお、
図において図4と同等の構成部品については、同一符号
を付しその説明を省略する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 is an overall configuration diagram showing an electrophotographic apparatus of the present invention, FIG. 2 is a side view of a main part of a return path applied to the electrophotographic apparatus of the present invention, and FIG. 3 is applied to the electrophotographic apparatus of the present invention. It is a principal part perspective view of the return path performed. In addition,
In the drawing, the same components as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.

【0012】図1に示した電子写真装置の構成におい
て、図4と異なる点は戻し路12にカール矯正手段とな
るカール矯正装置20を装備した点にある。
The configuration of the electrophotographic apparatus shown in FIG. 1 differs from that of FIG. 4 in that the return path 12 is provided with a curl correcting device 20 as a curl correcting means.

【0013】カール矯正装置20は、図2および図3に
示すように、凹状に曲げられた表面を有するガイド部材
21と、ガイド部材21の表面に対し所定のギャップを
なすとともに回転可能に設けられた例えばゴムローラか
らなる円筒状部材22と、ゲート部材23とから構成さ
れている。ここでゲート部材23は、軸23aを支点と
し回動可能に支持されており、ガイド部材21と円筒状
部材22との間に用紙を送り込むように案内する第1の
位置(図2の状態)と、円筒状部材22上方に用紙を送
り込むように案内する第2の位置(図2の状態から反時
計方向へ回動し、ゲート部材23上面が略水平になった
状態)とを選択的に切替え可能に設けられている。
As shown in FIGS. 2 and 3, the curl correcting device 20 is provided with a guide member 21 having a concavely curved surface, a predetermined gap with respect to the surface of the guide member 21, and a rotatable member. The gate member 23 includes a cylindrical member 22 made of, for example, a rubber roller. Here, the gate member 23 is rotatably supported on the shaft 23a as a fulcrum, and guides the sheet so as to be fed between the guide member 21 and the cylindrical member 22 (the state shown in FIG. 2). And a second position for guiding the paper to be fed above the cylindrical member 22 (a state where the sheet is turned counterclockwise from the state of FIG. 2 and the upper surface of the gate member 23 is substantially horizontal). It is provided to be switchable.

【0014】また、円筒状部材22は、搬送ローラ対を
駆動するためのギア列(図示せず)に連結されており、
ガイド部材21に対し相対的に回転している。
The cylindrical member 22 is connected to a gear train (not shown) for driving a pair of conveying rollers.
It rotates relatively to the guide member 21.

【0015】なお、図において24,25,26は戻し路
12上に設けられた搬送ローラ対である。
In FIG. 1, reference numerals 24, 25, and 26 denote conveying roller pairs provided on the return path 12.

【0016】次に上記構成の電子写真装置において両面
印刷が行われる場合の様子を説明する。給紙部1a、1
bまたは1cから転写部へ送られた用紙には、感光ドラ
ム2上に形成されたトナー像が転写器6によって転写さ
れる。用紙は剥離器18によって感光ドラム2表面から
剥離され、搬送ベルト19によって定着装置7に搬送さ
れる。定着装置7は未定着トナー像を保持した用紙を加
熱、加圧し、トナー像を用紙に定着させる。定着装置7
から送り出された用紙は、フラップ8により引込み路1
1へ案内されるとともに、搬送ローラ対15,16によ
り用紙後端が搬送ローラ対15から送り出されるまで引
き込まれる。用紙後端が搬送ローラ対15から送り出さ
れると、フラップ17の位置が図2の破線で示す位置か
ら実線で示す位置に切り替わる。フラップ17が実線位
置に切り替わった状態で搬送ローラ対16の回転方向を
反転させると、上述の用紙後端が先頭になって戻し路1
2へ送り出される。
Next, a state in which double-sided printing is performed in the electrophotographic apparatus having the above configuration will be described. Paper feeder 1a, 1
The toner image formed on the photosensitive drum 2 is transferred by the transfer unit 6 to the sheet sent from b or 1c to the transfer unit. The sheet is peeled from the surface of the photosensitive drum 2 by the peeler 18, and is transported to the fixing device 7 by the transport belt 19. The fixing device 7 heats and pressurizes the sheet holding the unfixed toner image to fix the toner image on the sheet. Fixing device 7
The paper sent out of the feeding path 1 by the flap 8
1 and is pulled in by the pair of transport rollers 15 and 16 until the rear end of the sheet is sent out from the pair of transport rollers 15. When the trailing edge of the sheet is fed from the pair of transport rollers 15, the position of the flap 17 switches from the position shown by the broken line in FIG. 2 to the position shown by the solid line. When the rotation direction of the conveying roller pair 16 is reversed in a state where the flap 17 has been switched to the solid line position, the above-mentioned paper trailing end becomes the top and the return path 1
It is sent to 2.

【0017】戻し路12に送り込まれた第1面印刷済み
の用紙は、搬送ローラ対24によって搬送されるととも
に、ゲート部材23に案内されて、ガイド部材21と円
筒状部材(ゴムローラ)22との間に送り込まれる。第
1面印刷の過程において用紙についたカールは、ガイド
部材21とゴムローラ22によって形成された戻し路1
2に対し下側に突出する搬送路を通過することにより矯
正され、ゴムローラ22、搬送ローラ対25および搬送
ローラ対26によって戻し路12内を走行し、第2面印
刷のため再び転写部へ送り込まれる。
The first-side printed sheet sent to the return path 12 is conveyed by a pair of conveying rollers 24 and is guided by a gate member 23 so that the guide member 21 and a cylindrical member (rubber roller) 22 It is sent in between. The curl attached to the sheet in the process of the first side printing is caused by the return path 1 formed by the guide member 21 and the rubber roller 22.
The sheet 2 is corrected by passing through a conveying path projecting downward with respect to 2, and travels in the return path 12 by the rubber roller 22, the conveying roller pair 25 and the conveying roller pair 26, and is sent again to the transfer section for the second surface printing. It is.

【0018】[0018]

【発明の効果】以上述べたように本発明によれば、戻し
路に、戻し路上を搬送される用紙のカールを矯正するカ
ール矯正手段を備えたので、用紙の第1面への印刷にお
いて生成されたカールを、効率よく且つ効果的に除去
し、両面印刷を円滑に行える電子写真装置を提供するこ
とができる。
As described above, according to the present invention, since the return path is provided with the curl correcting means for correcting the curl of the sheet conveyed on the return path, the curl correction means is provided for printing on the first side of the sheet. It is possible to provide an electrophotographic apparatus capable of efficiently and effectively removing a curled sheet and performing two-sided printing smoothly.

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

【図1】本発明の電子写真装置を示す全体構成図。FIG. 1 is an overall configuration diagram showing an electrophotographic apparatus of the present invention.

【図2】本発明の電子写真装置に適用される戻し路の要
部側面図。
FIG. 2 is a side view of a main part of a return path applied to the electrophotographic apparatus of the present invention.

【図3】本発明の電子写真装置に適用される戻し路の要
部斜視図。
FIG. 3 is a perspective view of a main part of a return path applied to the electrophotographic apparatus of the present invention.

【図4】従来の電子写真装置を示す全体構成図。FIG. 4 is an overall configuration diagram showing a conventional electrophotographic apparatus.

【符号の説明】[Explanation of symbols]

10…送紙路、11…引込み路、12…戻し路、20…
カール矯正装置、21…ガイド部材、22…円筒状部
材、23…ゲート部材、24,25,26…搬送ローラ
対。
10: paper feed path, 11: pull-in path, 12: return path, 20 ...
Curl correcting device, 21: guide member, 22: cylindrical member, 23: gate member, 24, 25, 26: transport roller pair.

───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 2H028 BA06 BA09 BA16 3F053 EA02 EA05 EB04 EC02 HA03 HB01 HB11 LA02 LA07 LB01 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H028 BA06 BA09 BA16 3F053 EA02 EA05 EB04 EC02 HA03 HB01 HB11 LA02 LA07 LB01

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】給紙部、搬送される用紙上に画像を記録形
成する画像形成手段および画像記録後の用紙を収容する
排紙部を連絡する送紙路と、前記画像形成手段に対し用
紙搬送方向下流側の送紙路から分岐して設けられた引込
み路と、前記引込み路の途中から分岐し、その終端を前
記画像形成手段に対し用紙搬送方向上流側の送紙路に合
流させてなる戻し路とを有する電子写真装置において、
前記戻し路に、戻し路上を搬送される用紙のカールを矯
正するカール矯正手段を備えたことを特徴とする電子写
真装置。
An image forming means for recording and forming an image on a conveyed sheet; and a paper feed path for communicating a paper discharge section for accommodating the image-recorded sheet; A retraction path provided by branching from a paper feed path on the downstream side in the transport direction, and a branch from the middle of the retraction path, and the terminal end is joined to the paper transport path on the upstream side in the paper transport direction with respect to the image forming means. An electrophotographic apparatus having a return path
An electrophotographic apparatus, comprising: a curl correcting unit for correcting curl of a sheet conveyed on the return path.
【請求項2】前記カール矯正手段は、凹状に曲げられた
表面を有するガイド部材と、該ガイド部材表面に対し所
定のギャップをなすとともに回転可能に設けられた円筒
状部材と、前記ガイド部材と円筒状部材との間に用紙を
送り込むように案内する第1の位置と、前記円筒状部材
上方に用紙を送り込むように案内する第2の位置とを選
択的に切替え可能に設けられたゲート部材とを含むこと
を特徴とする請求項1記載の電子写真装置。
2. The curl correcting means includes: a guide member having a concavely curved surface; a cylindrical member provided at a predetermined gap with respect to the guide member surface and rotatably provided; A gate member provided to be selectively switchable between a first position for guiding paper to be fed between the cylindrical member and a second position for guiding paper to be fed above the cylindrical member. 2. The electrophotographic apparatus according to claim 1, comprising:
JP2163099A 1999-01-29 1999-01-29 Electrophotographic device Pending JP2000219387A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2163099A JP2000219387A (en) 1999-01-29 1999-01-29 Electrophotographic device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2163099A JP2000219387A (en) 1999-01-29 1999-01-29 Electrophotographic device

Publications (1)

Publication Number Publication Date
JP2000219387A true JP2000219387A (en) 2000-08-08

Family

ID=12060396

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2163099A Pending JP2000219387A (en) 1999-01-29 1999-01-29 Electrophotographic device

Country Status (1)

Country Link
JP (1) JP2000219387A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004256292A (en) * 2003-02-28 2004-09-16 Hitachi Printing Solutions Ltd Electrophotographic printer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004256292A (en) * 2003-02-28 2004-09-16 Hitachi Printing Solutions Ltd Electrophotographic printer

Similar Documents

Publication Publication Date Title
JP2009029554A (en) Curl remover and image forming device
JP3257712B2 (en) Transport path switching device
JP2002167094A (en) Image forming device
JP3562690B2 (en) Paper transport method for image recording device
JP4833806B2 (en) Transfer paper curl removal apparatus and image forming apparatus
JP2000219387A (en) Electrophotographic device
JP2000047443A (en) Electrophotographic device
JP4719545B2 (en) Paper reversing device and image forming apparatus
JP2726783B2 (en) Double-sided printing device
JP2004345842A (en) Image forming apparatus
JP3634158B2 (en) Sheet conveying apparatus and image forming apparatus
JP4150512B2 (en) Image forming apparatus
JP3815533B2 (en) Image forming apparatus
JP2005154123A (en) Sheet material conveyance device and image forming device
JP3647649B2 (en) Sheet curl correction apparatus and image forming apparatus
JP3242054B2 (en) Image forming device
JP3744671B2 (en) Image forming apparatus
JPH01167164A (en) Sheet uncurler
JP2638957B2 (en) Paper reversing device for image forming apparatus
JPH032541Y2 (en)
JP2000095449A (en) Image forming device
JP3289537B2 (en) Paper reversing device
JP2004345841A (en) Image forming apparatus
JP2832914B2 (en) Paper transport device
JP2004233702A (en) Image forming apparatus

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20060214

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20060428

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20060818