JPH0540430A - Both-side printing device - Google Patents
Both-side printing deviceInfo
- Publication number
- JPH0540430A JPH0540430A JP3197877A JP19787791A JPH0540430A JP H0540430 A JPH0540430 A JP H0540430A JP 3197877 A JP3197877 A JP 3197877A JP 19787791 A JP19787791 A JP 19787791A JP H0540430 A JPH0540430 A JP H0540430A
- Authority
- JP
- Japan
- Prior art keywords
- roller
- paper
- fixing device
- sheet
- immediately
- 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.)
- Granted
Links
Landscapes
- Counters In Electrophotography And Two-Sided Copying (AREA)
- Fixing For Electrophotography (AREA)
- Paper Feeding For Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、用紙の表面に印刷を行
なった後に、当該用紙が裏返されて再び転写部に移送さ
れ、裏面にもトナー像を転写して定着する両面印刷装置
における用紙搬送機構に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet in a double-sided printing apparatus in which after printing on the front surface of a sheet, the sheet is turned over and transferred to a transfer section again, and a toner image is transferred and fixed on the back side. Concerning the transport mechanism.
【０００２】[0002]
【従来の技術】図５は従来の両面印刷装置の側面図であ
る。１は感光ドラムであり、その外周に、反時計回りに
露光部２、現像器３、転写器４、クリーナ５および一様
帯電器６の順に配設されている。いま、感光ドラム１の
全幅が一様帯電器６で帯電された後、露光部２に到来す
ると、回転ミラー７で反射された情報光８が露光部２に
照射されることで、静電潜像が形成される。この静電潜
像に、現像器３でトナーが付着され、転写器４の位置
で、トナー像が用紙に転写された後、クリーナ５で残存
トナーや電荷が除去され、再び一様帯電器６の位置に移
動する。2. Description of the Related Art FIG. 5 is a side view of a conventional double-sided printing apparatus. Reference numeral 1 denotes a photosensitive drum, on the outer periphery of which an exposure unit 2, a developing device 3, a transfer device 4, a cleaner 5, and a uniform charging device 6 are arranged in the counterclockwise order. When the photosensitive drum 1 reaches the exposure unit 2 after the entire width of the photosensitive drum 1 has been charged by the uniform charger 6, the exposure unit 2 is irradiated with the information light 8 reflected by the rotating mirror 7, so that the electrostatic latent image is generated. An image is formed. Toner is attached to the electrostatic latent image by the developing device 3, and the toner image is transferred to the sheet at the position of the transfer device 4, and then the cleaner 5 removes the residual toner and electric charge, and the uniform charging device 6 is again provided. Move to position.
【０００３】一方、給紙部９から用紙を供給すると、用
紙搬送ローラ10、11で転写器４に移送される。転写器４
は、転写チャージャーから成り、コロナ放電によって、
トナー像と逆極性の電荷を用紙に印加することで、感光
ドラム１上のトナー像を用紙に吸着するようになってい
る。On the other hand, when a sheet is fed from the sheet feeding section 9, it is transferred to the transfer unit 4 by the sheet conveying rollers 10 and 11. Transfer device 4
Consists of a transfer charger, and by corona discharge,
By applying an electric charge having a polarity opposite to that of the toner image to the paper, the toner image on the photosensitive drum 1 is attracted to the paper.
【０００４】トナー像が転写された用紙は、吸着搬送ユ
ニット12で定着器13に移送され、加熱定着される。すな
わち、感光ドラム１側のローラ13ａがヒータを内蔵した
熱ローラなため、トナー像が付着した用紙が、ローラ定
着器13を通過する際に、用紙およびトナー像が加熱さ
れ、トナー像が溶融して用紙にしみ込み、定着が行われ
る。The sheet on which the toner image is transferred is transferred to the fixing device 13 by the suction and conveyance unit 12 and is heated and fixed. That is, since the roller 13a on the side of the photosensitive drum 1 is a heat roller having a built-in heater, when the paper on which the toner image is attached passes through the roller fixing device 13, the paper and the toner image are heated and the toner image is melted. The paper is soaked in the paper and fixed.
【０００５】トナー像が定着された用紙は、片面印刷の
場合は、用紙搬送ローラ14、用紙排出ローラ15、16を経
由して、用紙スタッカに排出される。両面印刷の場合
は、定着器13の直後の用紙搬送ローラ14、用紙反転部の
ローラ17、18間を経由して、スイッチバックローラ19に
移送される。In the case of single-sided printing, the sheet on which the toner image is fixed is discharged to the sheet stacker via the sheet conveying roller 14 and the sheet discharging rollers 15 and 16. In the case of double-sided printing, the sheet is conveyed to the switchback roller 19 via the sheet conveying roller 14 immediately after the fixing device 13 and the rollers 17 and 18 of the sheet reversing unit.
【０００６】用紙の後端が、走路切り換え部のローラ1
7、18を通過すると、スイッチバックローラ19および走
路切り換え部のローラ17、20が逆転するため、当該用紙
は、走路切り換え部のローラ17、20によって、上側の後
退走路24に案内され、後退走路のガイドローラ21、22、
23で後退送りされ、かつＵターンして、前記の用紙搬送
ローラ11で転写器４と感光ドラム１間に移送される。こ
のように用紙が後退しＵターンすることによって、用紙
は裏返した状態で転写部に供給される。The trailing edge of the paper is the roller 1 of the path switching unit.
When passing through 7 and 18, the switchback roller 19 and the rollers 17 and 20 of the traveling path switching unit reversely rotate, so that the paper is guided to the upper traveling path 24 by the rollers 17 and 20 of the traveling path switching unit, Guide rollers 21, 22,
The paper is fed backward at 23, and makes a U-turn, and is transported between the transfer device 4 and the photosensitive drum 1 by the paper transport roller 11. As the sheet moves backward and makes a U-turn in this manner, the sheet is supplied to the transfer portion in an upside down state.
【０００７】このようにして裏面が感光ドラム１上に到
来すると、感光ドラム１上のトナー像が用紙の裏面に転
写される。次いで、吸着搬送ユニット12を介して定着器
13に移送され、熱定着された後、定着器直後の用紙搬送
ローラ14、用紙搬送ローラ15、排出ローラ16を経由し
て、スタッカに排出される。When the back surface reaches the photosensitive drum 1 in this way, the toner image on the photosensitive drum 1 is transferred to the back surface of the paper. Then, the fixing device is attached via the adsorption and transport unit 12.
After being transferred to 13 and thermally fixed, it is ejected to the stacker via the sheet conveyance roller 14, the sheet conveyance roller 15 and the ejection roller 16 immediately after the fixing device.
【０００８】ところで、従来の装置では、定着器13にお
いて加熱定着された後に、用紙が定着器直後の用紙搬送
ローラ14を通過する際に、用紙が変形するといった問題
が生じた。この変形は、目立たない程度の微小量なた
め、片面印刷の場合は、特に問題とならない。また、時
間が経過すると、元の状態に戻る。しかしながら、両面
印刷の場合には、直ちに表裏反転されて転写部に移送さ
れ、裏面への転写が行われるため、裏面印刷の際に転写
不良となる。By the way, in the conventional apparatus, there is a problem that the sheet is deformed when the sheet passes through the sheet conveying roller 14 immediately after the fixing device after being heated and fixed in the fixing device 13. Since this deformation is such a minute amount that it is inconspicuous, there is no particular problem in the case of single-sided printing. Moreover, when time passes, it returns to the original state. However, in the case of double-sided printing, since the front and back sides are immediately reversed and transferred to the transfer portion and transferred to the back surface, transfer failure occurs during back surface printing.
【０００９】すなわち、用紙表面に印刷する際に、用紙
搬送ローラ14で変形した用紙が、前記のようにスイッチ
バックローラ19および走路切り換え部のローラ17、20で
後退走路24にガイドされ、Ｕターンして裏返した状態で
転写部に移送され、感光ドラム１からトナー像の転写が
行われる際に、用紙の変形のために全面が感光ドラム１
に密着できず、隙間が生じる。その結果、密着できない
面においては、感光ドラム上のトナーが用紙上に確実に
転写されないことになり、文字のカスレや転写抜け、濃
度不足といった画像障害となる。That is, when printing on the surface of the paper, the paper deformed by the paper transport roller 14 is guided to the backward running path 24 by the switchback roller 19 and the rollers 17, 20 of the running path switching unit as described above, and the U-turn is performed. Then, when the toner image is transferred from the photosensitive drum 1 to the transfer portion in an upside down state, the entire surface is deformed due to the deformation of the paper.
Can not be adhered to and there is a gap. As a result, the toner on the photosensitive drum is not reliably transferred onto the paper on the surface that cannot be in close contact, which causes image defects such as character blurring, transfer omission, and insufficient density.
【００１０】ローラ式の転写器の場合は、転写ローラに
よって用紙が感光ドラム１に押しつけられるため、目立
った転写不良は生じないが、機械的な押圧力の発生しな
いコロナ放電式の転写器の場合に特に問題となる。In the case of the roller type transfer device, since the transfer roller presses the sheet against the photosensitive drum 1, no noticeable transfer failure occurs, but in the case of a corona discharge type transfer device in which no mechanical pressing force is generated. Will be a particular problem.
【００１１】このような転写不良の原因となる用紙の変
形は、定着器13において熱定着された直後の熱い用紙が
用紙搬送ローラ14で挟まれた際に発生する。図６は、従
来の用紙搬送ローラを示す図で、 (a)は平面図、(b)は
側面図である。従来の用紙搬送ローラはすべて、金属性
の軸25に、一定間隔Ｄをおいて、幅Ｗのゴムローラ26を
設けた構造になっている。The deformation of the paper which causes such a transfer failure occurs when the hot paper immediately after being thermally fixed in the fixing device 13 is sandwiched by the paper conveying rollers 14. 6A and 6B are views showing a conventional sheet conveying roller, where FIG. 6A is a plan view and FIG. 6B is a side view. All the conventional paper transport rollers have a structure in which a metal shaft 25 is provided with a rubber roller 26 having a width W at a constant interval D.
【００１２】このように従来の用紙搬送ローラは、ゴム
ローラ26の存在する領域( Ｗ )と存在しない領域( Ｄ )
があるため、用紙27上にゴムローラ26の圧力が加わる領
域ｗとゴムローラ26の圧力が加わらない領域（斜線を施
した領域）ｄが交互に発生する。このように、ゴムロー
ラ26の圧力を受けた領域と受けない領域が発生してお
り、特に材料節減のためにゴムローラ26の幅Ｗが小さい
ため、用紙27のゴムローラ26と接しない領域ｄにおい
て、用紙27にゆるやかな波を打ったような微小な変形が
発生しやすい。As described above, in the conventional paper conveying roller, the area (W) where the rubber roller 26 exists and the area (D) where the rubber roller 26 does not exist.
Therefore, the area w where the pressure of the rubber roller 26 is applied and the area d where the pressure of the rubber roller 26 is not applied (hatched area) d are alternately generated on the sheet 27. In this way, there are regions where the rubber roller 26 receives pressure and regions where it does not. In particular, since the width W of the rubber roller 26 is small to save material, in the area d that does not contact the rubber roller 26 of the paper 27, Small deformations such as gentle waves on 27 are likely to occur.
【００１３】熱定着の直後は、用紙が加熱されているた
めに、変形しやすい。したがって、用紙の変形は、定着
器直後の用紙搬送ローラ14で発生する。用紙が他の用紙
搬送ローラに到達する時点では放熱されているため、他
の用紙搬送ローラにおいては変形しない。Immediately after the heat fixing, the paper is heated and therefore easily deformed. Therefore, the sheet is deformed by the sheet conveying roller 14 immediately after the fixing device. Since the heat is dissipated when the sheet reaches the other sheet transport rollers, the other sheet transport rollers do not deform.
【００１４】このような問題を解決するために、本発明
の発明らは、特願平３− 号(91-7824) において、
熱定着器の直後の用紙搬送ローラを改良することで、両
面印刷装置において裏面に転写する際の転写不良を未然
に防止できる手段を提案した。In order to solve such a problem, the inventors of the present invention describe in Japanese Patent Application No. 3- (91-7824):
By improving the paper transport roller immediately after the heat fixing device, we have proposed a means that can prevent transfer defects when transferring to the back side in a double-sided printing device.
【００１５】図７はこの解決手段を例示する平面図と側
面図である。28は用紙搬送ローラであり、この用紙搬送
ローラ28は、熱定着器の直後における用紙搬送ローラの
みに適用される。すなわち、用紙27を挟んで回転する一
対の用紙搬送ローラ28、28は、ローラ軸25とゴムや樹脂
などからなるローラ部29とからなっているが、このロー
ラ部29は用紙全幅Ｐにわたって設けられており、しかも
その全長にわたって同一外径となり、用紙27の表裏全面
がローラ部29、29と接するように構成されている。FIG. 7 is a plan view and a side view illustrating this solution. 28 is a paper carrying roller, and this paper carrying roller 28 is applied only to the paper carrying roller immediately after the heat fixing device. That is, the pair of sheet conveying rollers 28, 28 that sandwich the sheet 27 and rotate include the roller shaft 25 and the roller portion 29 made of rubber or resin. The roller portion 29 is provided over the entire width P of the sheet. In addition, the outer diameter is the same over the entire length, and the entire front and back surfaces of the paper 27 are in contact with the roller portions 29, 29.
【００１６】このように用紙搬送ローラ28のローラ部29
に、用紙27の全面が接することによって、用紙27の全面
が一対のローラ部29、29間に挟まれることになり、全面
が均一にローラ部29、29によって加圧される。その結
果、熱定着器の直後における用紙搬送ローラ28を通過す
る際に、用紙27が変形するのを抑制でき、裏面印刷時の
転写不良を防止できる。In this way, the roller portion 29 of the paper carrying roller 28
Since the entire surface of the sheet 27 contacts, the entire surface of the sheet 27 is sandwiched between the pair of roller portions 29, 29, and the entire surface is uniformly pressed by the roller portions 29, 29. As a result, it is possible to prevent the paper 27 from being deformed when passing through the paper transport roller 28 immediately after the heat fixing device, and it is possible to prevent transfer failure during back surface printing.
【００１７】また、前記のローラ部29が全長にわたって
同一外径の用紙搬送ローラ28を、そのローラ部29の周速
V1が定着器の熱ローラ13ａの周速V2よりも速くなるよう
に構成することによって、定着器13とローラ部29間にお
いて、用紙27の全幅にわたって張力Ｔが作用する。すな
わち、熱ローラ13ａと用紙搬送ローラ28のローラ部29と
の周速の差によって、用紙27が全幅にわたって均一に引
っ張られるため、変形が一層発生しにくくなり、また熱
定着器によって発生する用紙の微小な変形をも除去する
ことができる。Further, the roller portion 29 is provided with a sheet conveying roller 28 having the same outer diameter over the entire length, and the peripheral speed of the roller portion 29 is
By configuring V1 to be faster than the peripheral speed V2 of the heat roller 13a of the fixing device, the tension T acts between the fixing device 13 and the roller portion 29 over the entire width of the sheet 27. That is, the difference in peripheral speed between the heat roller 13a and the roller portion 29 of the paper transport roller 28 causes the paper 27 to be pulled uniformly over the entire width, so that the deformation is less likely to occur and the paper generated by the heat fixing device is not easily deformed. Even minute deformations can be removed.
【００１８】[0018]
【発明が解決しようとする課題】しかしながら、このよ
うに用紙全幅にわたってローラ部29を有する用紙搬送ロ
ーラ28を定着器の直後に設けた構造では、用紙の変形を
防止できる利点はあるが、定着時に溶融したトナーの粘
性で用紙27が用紙搬送ローラ28に粘着し、紙詰まりを引
き起こすといった新たな問題が生じた。However, in the structure in which the sheet conveying roller 28 having the roller portion 29 over the entire width of the sheet is provided immediately after the fixing device as described above, there is an advantage that the deformation of the sheet can be prevented, but at the time of fixing the sheet. The viscosity of the melted toner causes the paper 27 to stick to the paper transport roller 28, causing a new problem of causing paper jam.
【００１９】すなわち、図７(b) に示すように、定着器
13中における熱ローラ13ａおよび加圧ローラ部13ｂの外
周には、用紙27が粘着するのを防止する分離爪30が、数
カ所に配設されている。That is, as shown in FIG. 7B, the fixing device
Separation claws 30 for preventing the paper sheet 27 from adhering to each other are provided at several positions on the outer circumferences of the heat roller 13a and the pressure roller portion 13b in the inside 13.
【００２０】印字密度が高いトナー像の場合は、紙面に
多量のトナーが付着しているため、用紙は定着器のロー
ラ13ａ、13ｂ間で加圧された後、溶融トナーの粘性によ
ってトナー像側の熱ローラ13ａに粘着し、用紙27が熱ロ
ーラ13ａ側に巻き込まれるような動きを示す。しかし、
前記のように、定着器のローラ13ａ、13ｂには、張り着
こうとする用紙を引き剥がす分離爪30がついているた
め、用紙が定着器のローラ13ａ、13ｂに巻き込まれるこ
とはない。In the case of a toner image having a high print density, a large amount of toner adheres to the surface of the paper, so the paper is pressed between the rollers 13a and 13b of the fixing device, and then the toner image side due to the viscosity of the molten toner. The paper 27 adheres to the heat roller 13a, and the paper 27 moves in such a manner as to be rolled up on the heat roller 13a side. But,
As described above, since the rollers 13a and 13b of the fixing device are provided with the separation claw 30 for peeling off the sheet to be stuck, the sheet is not caught by the rollers 13a and 13b of the fixing device.
【００２１】しかしながら、定着器を通過した直後の用
紙搬送ローラ28を通過する時点でも、用紙は定着器の熱
で熱いため、用紙上の溶融トナーが用紙搬送ローラ28の
表面に粘着し、用紙が用紙搬送ローラ28側に巻き込ま
れ、紙詰まりを起こす恐れがある。定着器13の場合は、
ローラ13ａ、13ｂに用紙分離爪30がバネ力で圧接しても
ローラ表面が傷つかないように、オイルローラ31から離
型オイルを供給するなどの対策がなされているが、用紙
搬送ローラ28にも分離爪30やオイルローラ31を設けるの
は、コスト高となる。However, even when the paper passes through the paper carrying roller 28 immediately after passing through the fixing device, the heat of the fixing device heats the paper, so that the molten toner on the paper adheres to the surface of the paper carrying roller 28, and the paper is It may get caught in the paper transport roller 28 side and cause a paper jam. In the case of the fixing device 13,
Measures have been taken such as supplying release oil from the oil roller 31 so that the roller surface is not damaged even if the paper separating claw 30 is pressed against the rollers 13a and 13b by the spring force. Providing the separation claw 30 and the oil roller 31 is costly.
【００２２】一方、図６に示したような従来の用紙搬送
ローラでは、図８に示すように、分離された各ゴムロー
ラ26の間の隙間32に、用紙ガイド33を配設した構造にな
っている。そのため、用紙27が溶融トナーの粘性でゴム
ローラ26側に巻き込まれる前に、用紙先端が用紙ガイド
33に当たってすくい上げられ、用紙搬送路39に案内され
るので、紙詰まりも発生しない。On the other hand, in the conventional paper conveying roller as shown in FIG. 6, as shown in FIG. 8, the paper guide 33 is arranged in the gap 32 between the separated rubber rollers 26. There is. For this reason, the leading edge of the paper 27 is fed to the paper guide before the paper 27 is rolled up on the rubber roller 26 side due to the viscosity of the molten toner.
Since it is scooped up by 33 and guided to the paper transport path 39, paper jam does not occur.
【００２３】しかしながら、前記のように、ゴムローラ
26で加圧されない領域ｄが広いために、微小変形を起こ
し、両面印刷装置において裏面側にトナー像を転写する
際に転写不良を来たす、といった問題がある。However, as mentioned above, the rubber roller
Since the area d not pressed by 26 is large, there is a problem that minute deformation occurs and transfer failure occurs when the toner image is transferred to the back surface side in the double-sided printing apparatus.
【００２４】本発明の技術的課題は、このような問題に
着目し、両面印刷装置において裏面側にトナー像を転写
する際の転写不良が発生せず、しかも溶融トナーの粘性
で用紙が定着器直後の用紙搬送ローラ側に巻き込まれ、
紙詰まりを起こすのを安価な構造で防止可能とすること
にある。The technical problem of the present invention is to pay attention to such a problem, and in the double-sided printing apparatus, no transfer failure occurs when the toner image is transferred to the back side, and the paper is fixed by the viscosity of the molten toner. Immediately after being caught in the paper transport roller side,
The purpose is to prevent paper jams with an inexpensive structure.
【００２５】[0025]
【課題を解決するための手段】図１は本発明による両面
印刷装置の基本原理を説明する平面図と側面図である。
本発明は、本発明の発明らが先に提案した用紙全幅にわ
たってローラ部を設けて用紙の微小変形を防止する思想
と、図８における用紙ガイドで用紙先端をすくい上げる
思想を併用したものである。FIG. 1 is a plan view and a side view for explaining the basic principle of a double-sided printing apparatus according to the present invention.
The present invention combines the idea proposed by the inventors of the present invention to prevent the minute deformation of the sheet by providing the roller portion over the entire width of the sheet and the idea of scooping the leading edge of the sheet by the sheet guide in FIG.
【００２６】すなわち、用紙27の片面に印刷を行なった
後に、当該用紙27が表裏反転されて再び転写部に移送さ
れ、裏面にもトナー像を転写して定着する両面印刷装置
において、熱定着器の直後の用紙搬送ローラ28Ｒが、ロ
ーラ軸25とその外周に設けたゴムや樹脂などからなるロ
ーラ部29Ｒとで構成されている。しかしながら、このロ
ーラ部29Ｒは、前記の用紙幅Ｐより長い単一ローラ29で
はなく、複数のローラ部291 …29ｎが小間隔Ｇをおいて
配設されており、しかも小間隔Ｇ中に用紙ガイド34が進
入している。That is, after printing on one side of the sheet 27, the sheet 27 is turned upside down and transferred to the transfer section again, and the toner image is transferred and fixed on the back side as well. Immediately after the sheet conveyance roller 28R, it is constituted by the roller shaft 25 and a roller portion 29R made of rubber or resin provided on the outer periphery thereof. However, the roller portion 29R is not a single roller 29 longer than the paper width P described above, but a plurality of roller portions 29 1 ... Guide 34 is entering.
【００２７】そして、ローラ部29Ｒの用紙挟持領域RPに
おいて、用紙幅Ｐの少なくとも半分以上がローラ部29Ｒ
と接するように、前記のローラ間隔部Ｇの総和よりロー
ラ部291 …29ｎの幅RWの総和を大きくした構造になって
いる。In the paper holding region RP of the roller portion 29R, at least half of the paper width P is the roller portion 29R.
29n, the total width RW of the roller portions 29 1 ... 29n is larger than the total roller gap portion G.
【００２８】請求項２の発明は、定着器が熱ローラ定着
構造の両面印刷装置において、請求項１のように複数の
ローラ部291 …29ｎを有し、ローラ間隔Ｇの総和よりロ
ーラ部291 …29ｎの総和が大きい用紙搬送ローラ28Ｒ
を、定着器直後に設けると共に、この用紙搬送ローラ28
Ｒのローラ部29Ｒの周速V1が定着器の熱ローラ13ａの周
速V2よりも相対的に速くなるように構成されている。な
お、この周速の差はわずかで足りる。According to a second aspect of the present invention, in the double-sided printing apparatus in which the fixing device has a heat roller fixing structure, a plurality of roller portions 29 1 ... Paper transport roller 28R with a large sum of 1 ... 29n
Is provided immediately after the fixing device, and the paper transport roller 28
The peripheral speed V1 of the R roller portion 29R is relatively faster than the peripheral speed V2 of the heat roller 13a of the fixing device. It should be noted that this difference in peripheral speed is sufficient.
【００２９】[0029]
【作用】本発明の定着器直後の用紙搬送ローラ28Ｒは、
用紙幅Ｐより長い単一ローラではなく、ローラ部29Ｒが
複数のローラ部291 …29ｎからなっているが、ローラ間
隔部Ｇの総和よりローラ部RWの総和が大きいため、用紙
幅Ｐの少なくとも半分以上はローラ部29Ｒで挟まれ加圧
される。したがって、ローラ間隔Ｇをできるだけ小さく
し、ローラ部29Ｒをできるだけ大きくすることで、用紙
27の大部分の面積を挟持し加圧できるため、用紙27の微
小変形が抑制され、用紙裏面にトナー像を転写するとき
も表面側と同じような良好な転写性能が得られる。The paper conveying roller 28R immediately after the fixing device of the present invention is
The roller portion 29R is not a single roller longer than the paper width P, but the roller portion 29R is composed of a plurality of roller portions 29 1 ... 29n. However, since the sum of the roller portions RW is larger than the sum of the roller gap portions G, at least the paper width P is at least More than half of them are sandwiched by the roller portions 29R and pressed. Therefore, by making the roller gap G as small as possible and making the roller portion 29R as large as possible,
Since most of the area of 27 can be sandwiched and pressed, minute deformation of the paper 27 is suppressed, and when transferring the toner image to the back surface of the paper, the same good transfer performance as on the front surface side can be obtained.
【００３０】また、各ローラ部291 …29ｎの間隔Ｇに、
用紙ガイド34が進入しているため、定着器から移送され
て来た熱い用紙27が用紙搬送ローラ28Ｒ、28Ｒ間を通過
しても、用紙27の先端が用紙ガイド34ですくい上げら
れ、用紙搬送路39に案内される。その結果、用紙27がト
ナー像側の用紙搬送ローラ28Ｒに巻きついたり、紙詰ま
りを起こすようなことはない。Further, at the interval G between the roller portions 29 1 ... 29 n,
Since the paper guide 34 has entered, even if the hot paper 27 transferred from the fixing device passes between the paper conveyance rollers 28R and 28R, the leading edge of the paper 27 is picked up by the paper guide 34, and the paper conveyance path You will be guided to 39. As a result, the sheet 27 does not wind around the sheet conveying roller 28R on the toner image side or cause a sheet jam.
【００３１】また、請求項２のように、熱ローラ式の定
着器13を用いるとともに、定着器直後の、ローラ間隔Ｇ
の総和よりローラ部RWの総和の大きい複数のローラ部29
Ｒの周速V1を、定着器の熱ローラ13ａの周速V2よりも相
対的に速くすることで、用紙27の全幅にわたって均一に
張力Ｔが作用するため、用紙の変形をより確実に防止す
ることができる。Further, as in claim 2, the heat roller type fixing device 13 is used, and the roller gap G immediately after the fixing device is used.
The total number of roller parts RW is larger than the total number of
By making the peripheral speed V1 of R relatively faster than the peripheral speed V2 of the heat roller 13a of the fixing device, the tension T acts uniformly over the entire width of the paper 27, so that the deformation of the paper is more reliably prevented. be able to.
【００３２】[0032]
【実施例】次に本発明による両面印刷装置が実際上どの
ように具体化されるかを実施例で説明する。図２は本発
明による両面印刷装置の実施例を示す側面図である。13
は熱ローラ式の定着器13であり、また転写器４はコロナ
帯電器からなっている。このような両面印刷装置におい
て、用紙を熱ローラ定着器13から後退走路24を通って転
写部に導く間には、多数の用紙搬送ローラが用いられて
いるが、本発明による一対の用紙搬送ローラ28Ｒ、28Ｒ
は、熱ローラ式定着器13の直後のみに配設されている。
すなわち、熱ローラ定着器13から排出直後の時に用紙が
最も熱くなり、変形を生じやすいからであり、他の用紙
搬送ローラは従来と同じ物を用いている。EXAMPLES Next, examples of practical application of the double-sided printing apparatus according to the present invention will be described. FIG. 2 is a side view showing an embodiment of the double-sided printing device according to the present invention. 13
Is a heat roller type fixing device 13, and the transfer device 4 is a corona charger. In such a double-sided printing apparatus, a large number of sheet conveying rollers are used while the sheet is guided from the heat roller fixing device 13 through the backward path 24 to the transfer portion. 28R, 28R
Is provided only immediately after the heat roller type fixing device 13.
That is, the sheet becomes the hottest immediately after being ejected from the heat roller fixing device 13 and is likely to be deformed, and the other sheet conveying rollers are the same as those used conventionally.
【００３３】図３は本発明による定着器直後の用紙搬送
機構の実施例を示す側面図である。図示の定着器13は、
熱ローラ13ａと加圧ローラ13ｂを有し、それぞれ外周に
分離爪30、30とオイルローラ31、31が配設されている。
なお、35はトナー除去用のブレード、36は清掃用のフェ
ルト、37は除電ブラシ、38は温度検出用のサーミスタで
ある。FIG. 3 is a side view showing an embodiment of the sheet conveying mechanism immediately after the fixing device according to the present invention. The fixing device 13 shown is
The heat roller 13a and the pressure roller 13b are provided, and the separation claws 30 and 30 and the oil rollers 31 and 31 are arranged on the outer circumferences thereof.
Incidentally, 35 is a blade for removing toner, 36 is a felt for cleaning, 37 is a static elimination brush, and 38 is a thermistor for temperature detection.
【００３４】28Ｒは本発明による用紙搬送ローラであ
り、ローラ軸25の外周に、ゴムや合成樹脂からなるロー
ラ部29R(複数のローラ部291 …29ｎからなっている) が
配設されている。そして、図１のように各ローラ部291
…29ｎの間隔Ｇの総和よりローラ部291 …29ｎのローラ
幅RWの総和が大きい。Reference numeral 28R is a sheet conveying roller according to the present invention, and a roller portion 29R (consisting of a plurality of roller portions 29 1 ... 29n) made of rubber or synthetic resin is arranged on the outer periphery of the roller shaft 25. .. Then, as shown in FIG. 1, each roller unit 29 1
The total sum of the roller widths RW of the roller portions 29 1 ... 29n is larger than the total sum of the gaps G of 29n.
【００３５】なお、図１に示すように実際には、ローラ
間隔Ｇが極めて小さいため、ローラ間隔Ｇの総和よりロ
ーラ幅RWの総和がはるかに大きい。そのため、図７に示
す用紙幅Ｐにわたって単一ローラ部29を有する搬送ロー
ラの場合に匹敵し、定着器直後の用紙搬送ローラで用紙
が微小変形するのを確実に防止できる。As shown in FIG. 1, since the roller gap G is actually very small, the total roller width RW is much larger than the total roller gap G. Therefore, it is possible to reliably prevent minute deformation of the sheet by the sheet conveying roller immediately after the fixing device, which is comparable to the case of the conveying roller having the single roller portion 29 over the sheet width P shown in FIG.
【００３６】また、各ローラ部291 …29ｎの間隔Ｇに用
紙ガイド34が進入しており、該用紙ガイド34の定着器13
側の端部がラッパ状に開いている。各用紙ガイド34の背
面（用紙搬送路39の反対側）に連結棒40を溶接し、この
連結棒40を介して装置フレームに固定する構造になって
いる。Further, the paper guide 34 enters into the space G between the roller portions 29 1 ... 29 n, and the fixing device 13 of the paper guide 34 is fixed.
The end on the side is open like a trumpet. A connecting rod 40 is welded to the back surface of each paper guide 34 (opposite side of the paper transport path 39), and is fixed to the apparatus frame via the connecting rod 40.
【００３７】定着器13において用紙およびトナー像を加
熱した際に、用紙27から水蒸気が発生し、用紙ガイドに
付着して水滴となるため、用紙27が用紙ガイドの水滴に
吸着され、円滑に搬送されなくなる恐れがある。これに
対し本発明は、定着器13の直後の用紙ガイドが、丸棒状
の用紙ガイド34を連結棒40で連結した構造になってい
て、用紙27とは線接触となり接触面積が小さくなるの
で、水滴で用紙27の搬送に支障を来たすことはない。When the paper and the toner image are heated in the fixing device 13, water vapor is generated from the paper 27 and adheres to the paper guide to form a water drop, so that the paper 27 is adsorbed by the water drop on the paper guide and smoothly transported. There is a fear that it will not be done. On the other hand, in the present invention, the paper guide immediately after the fixing device 13 has a structure in which the round bar-shaped paper guide 34 is connected by the connecting rod 40, and the line contact with the paper 27 is made, so that the contact area becomes small. Water drops will not interfere with the transportation of the paper 27.
【００３８】次に、印刷装置における定着器には、熱ロ
ーラ式の定着器とフラッシュ定着器が知られている。高
速印刷装置などにおいては、ハロゲンランプ等からなる
フラッシュ定着器が用いられるが、フラッシュ定着器に
よってトナー像を溶融させ用紙27に定着する際も発熱す
るため、熱ローラ式の定着器13の場合と同様に、転写器
直後の用紙搬送ローラを通過する際に用紙27に変形が生
じる。Next, as a fixing device in the printing apparatus, a heat roller type fixing device and a flash fixing device are known. A flash fixing device including a halogen lamp or the like is used in a high-speed printing device or the like, but heat is generated when the toner image is melted and fixed on the paper 27 by the flash fixing device. Similarly, the sheet 27 is deformed when passing through the sheet conveying roller immediately after the transfer device.
【００３９】したがって、本発明による、ローラ間隔Ｇ
よりローラ部RWの長い複数のローラ部291 …29ｎを有す
る用紙搬送ローラ28Ｒを、フラッシュ定着器の直後に配
設した構造とすることで、フラッシュ定着式の装置にお
いても、用紙27が変形するのを防止できる。Therefore, according to the present invention, the roller gap G
By using a structure in which the paper conveying roller 28R having a plurality of roller portions 29 1 ... 29n having a longer roller portion RW is disposed immediately after the flash fixing device, the paper 27 is deformed even in the flash fixing type device. Can be prevented.
【００４０】しかしながら、熱ローラ式の定着器13を用
いた場合は、フラッシュ定着器の場合より確実に用紙の
変形を防止できる。すなわち、熱ローラ式の定着器13の
場合は、用紙27が熱ローラ13ａと加圧ローラ13ｂとの間
に挟まれる。しかも、用紙27の全幅にわたって挟まれ
る。However, when the heat roller type fixing device 13 is used, the deformation of the paper can be prevented more reliably than in the case of the flash fixing device. That is, in the case of the heat roller type fixing device 13, the paper 27 is sandwiched between the heat roller 13a and the pressure roller 13b. Moreover, the entire width of the sheet 27 is sandwiched.
【００４１】いま、図３のように定着器として熱ローラ
式の定着器13を用いるとともに、定着器直後の用紙搬送
ローラ28Ｒのローラ部29Ｒの周速V1が定着器の熱ローラ
13ａの周速V2よりも相対的に速くなるように構成されて
いるため、用紙27の全幅にわたって、均一に張力Ｔが発
生する。その結果、用紙27における変形は一層発生しに
くくなる。なお、ローラ部29Ｒの周速V1と熱ローラ13ａ
の周速V2との周速差はわずかで足りる。As shown in FIG. 3, the heat roller type fixing device 13 is used as the fixing device, and the peripheral speed V 1 of the roller portion 29R of the paper conveying roller 28R immediately after the fixing device is the heat roller of the fixing device.
Since it is configured to be relatively faster than the peripheral velocity V 2 of 13a, the tension T is uniformly generated over the entire width of the sheet 27. As a result, the deformation of the paper 27 becomes even less likely to occur. The peripheral speed V 1 of the roller portion 29R and the heat roller 13a
The peripheral speed difference with the peripheral speed V 2 of V is small.
【００４２】また、転写器には、図２のようなコロナ帯
電器によるコロナ転写方式とバイアスローラ転写方式と
が知られており、それぞれ一長一短がある。バイアスロ
ーラ転写方式は、金属製のローラ軸に導電性のゴムやス
ポンジをライニングしたものに高電圧を印加し、転写ロ
ーラによって用紙の全幅を感光ドラムに押圧するため、
定着器直後の用紙搬送ローラで用紙に微小変形が生じて
も、変形が矯正された状態で転写が行われる。したがっ
て、本発明の装置は、特にコロナ転写方式の両面印刷装
置に有効である。As the transfer device, a corona transfer system using a corona charger as shown in FIG. 2 and a bias roller transfer system are known, and each has its advantages and disadvantages. In the bias roller transfer method, a high voltage is applied to a metal roller shaft lined with conductive rubber or sponge, and the transfer roller presses the entire width of the paper against the photosensitive drum.
Even if the paper is slightly deformed by the paper conveying roller immediately after the fixing device, the transfer is performed with the deformation corrected. Therefore, the apparatus of the present invention is particularly effective for a corona transfer type double-sided printing apparatus.
【００４３】本発明による用紙搬送ローラ28Ｒを製造す
るには、従来の一定間隔でゴムローラ26を有する用紙搬
送ローラを製造する場合と同じ方法でよい。すなわち、
金属製のローラ軸25の外周に、ローラ部291 …29ｎの領
域のみゴムや樹脂をライニングする。あるいは、ゴムや
樹脂からなる円筒状のローラ部291 …29ｎ中に、金属製
のローラ軸25を圧入する、などの手法で製造できる。The paper carrying roller 28R according to the present invention may be manufactured by the same method as that for manufacturing the paper carrying roller having the rubber rollers 26 at a constant interval. That is,
The outer circumference of the metal roller shaft 25 is lined with rubber or resin only in the areas of the roller portions 29 1 ... 29 n. Alternatively, it can be manufactured by a method of press-fitting a metal roller shaft 25 into a cylindrical roller portion 29 1 ... 29 n made of rubber or resin.
【００４４】また、一対の用紙搬送ローラ28Ｒ、28Ｒの
うち、片方のローラ部291 …29ｎをゴムなどの弾性体で
構成した場合は、他方の用紙搬送ローラ28Ｒのローラ部
291 …29ｎはデルリンなどのような比較的硬質の合成樹
脂で構成するのが通常である。[0044] The pair of paper conveying rollers 28R, of 28R, if the one of the roller portions 29 1 ... 29n and an elastic material such as rubber, the roller portion of the other sheet conveying rollers 28R
29 1 ... 29 n are usually made of a relatively hard synthetic resin such as Delrin.
【００４５】図４は、後者の合成樹脂でローラ部291 …
29ｎを構成した用紙搬送ローラの実施例を示す部分断面
／平面図である。各ローラ部291 …29ｎは、合成樹脂製
の筒状になっており、金属製のローラ軸25を挿入した
後、ローラ軸25およびローラ部291 …29ｎにあけた貫通
孔41にピン42を挿通することで固定されている。FIG. 4 shows the roller portion 29 1 ...
It is a partial cross section / plan view which shows the Example of the paper conveyance roller which comprised 29n. Each of the roller portions 29 1 ... 29 n has a cylindrical shape made of synthetic resin, and after inserting the metal roller shaft 25, the pin 42 is inserted into the through hole 41 formed in the roller shaft 25 and the roller portions 29 1 ... 29 n. It is fixed by inserting.
【００４６】[0046]
【発明の効果】以上のように本発明によれば、複数のロ
ーラ部291 …29ｎ…が小間隔Ｇをおいて配設され、各ロ
ーラ間の小間隔Ｇに用紙ガイド34が進入しているため、
用紙搬送ローラ28Ｒを通過した用紙27をすくい上げて用
紙搬送路に案内でき、溶融したトナー像の粘性で用紙27
が用紙搬送ローラ28Ｒに巻き込まれたり、紙詰まりを起
こすような問題が解消される。しかも、分離爪を設けた
りする場合に比べて安価に実現できる。As described above, according to the present invention, a plurality of roller portions 29 1 ... 29 n are arranged at a small interval G, and the paper guide 34 enters the small interval G between the rollers. Because
The paper 27 that has passed through the paper carrying roller 28R can be picked up and guided to the paper carrying path, and the paper 27 is viscous due to the viscosity of the melted toner image.
The problem that paper is caught in the paper transport roller 28R or paper jam occurs is solved. In addition, it can be realized at a lower cost than in the case where a separating claw is provided.
【００４７】また、ローラ部29Ｒの用紙挟持領域RPにお
いて、小間隔部Ｇの総和よりローラ部291 …29ｎの総和
が大きくなるように構成されているため、用紙幅の少な
くとも半分以上がローラ部29Ｒと接する。その結果、ロ
ーラ部291 …29ｎで用紙27の表裏を広い面にわたって均
一に圧接して、用紙の微小変形を確実に防止でき、表面
側に印刷した後、裏面に印刷する際に、用紙の少なくと
も半分以上の面が感光ドラムに密着して確実に転写で
き、用紙裏面も表面側と同様な良好な印字品質を得るこ
とができる。Further, in the paper sandwiching area RP of the roller portion 29R, the total sum of the roller portions 29 1 ... 29n is larger than the total sum of the small gap portions G, so that at least half or more of the paper width is the roller portion. Contact with 29R. As a result, the front and back of the paper 27 are pressed uniformly over a wide surface by the roller units 29 1 to 29 n, so that minute deformation of the paper can be surely prevented, and after printing on the front surface side, when printing on the back surface, At least half or more of the surfaces are in close contact with the photosensitive drum to ensure reliable transfer, and the back surface of the paper can have the same good printing quality as the front surface side.
【００４８】請求項２のように、熱ローラ式の定着器13
を用いるとともに、定着器直後の用紙搬送ローラ28Ｒの
ローラ部29Ｒの周速V1を、定着器の熱ローラ13ａの周速
V2よりも相対的に速くすることで、用紙27の全幅にわた
って均一に張力が作用するため、用紙の変形をより確実
に防止することができる。As in claim 2, a heat roller type fixing device 13
And the peripheral speed V1 of the roller portion 29R of the paper conveying roller 28R immediately after the fixing device is set to the peripheral speed of the heat roller 13a of the fixing device.
By making the speed relatively faster than V2, the tension uniformly acts on the entire width of the sheet 27, so that the deformation of the sheet can be prevented more reliably.
【図１】本発明による両面印刷装置の基本原理を説明す
る平面図と側面図である。FIG. 1 is a plan view and a side view illustrating a basic principle of a double-sided printing device according to the present invention.
【図２】本発明を実施した両面印刷装置を示す側面図で
ある。FIG. 2 is a side view showing a double-sided printing device embodying the present invention.
【図３】本発明による転写器直後の用紙搬送機構の実施
例を示す側面図である。FIG. 3 is a side view showing an embodiment of a sheet conveying mechanism immediately after a transfer device according to the present invention.
【図４】本発明による用紙搬送ローラの実施例を示す部
分断面／平面図である。FIG. 4 is a partial cross-sectional / plan view showing an embodiment of a paper carrying roller according to the present invention.
【図５】従来の両面印刷装置の側面図である。FIG. 5 is a side view of a conventional double-sided printing device.
【図６】従来の定着器直後の用紙搬送ローラを示す平面
図と側面図である。6A and 6B are a plan view and a side view showing a sheet conveying roller immediately after a conventional fixing device.
【図７】先に提案した定着器直後の用紙搬送機構を示す
平面図と側面図である。7A and 7B are a plan view and a side view showing a sheet transport mechanism immediately after the fixing device proposed previously.
【図８】従来の用紙ガイドを示す平面図と側面図であ
る。FIG. 8 is a plan view and a side view showing a conventional paper guide.
１ 感光ドラム ４ 転写器 13 定着器 13a 熱ローラ 13b 加圧ローラ 14 従来の定着器直後の用紙搬送ローラ 10,11,15,16,21,22,23 用紙搬送ローラ 24 後退走路 25 ローラ軸 26 ゴムローラ 27 用紙 28 先に提案した定着器直後の用紙搬送ローラ 28R 本発明による定着器直後の用紙搬送ローラ 29R 本発明の定着器直後の用紙搬送ローラにおけるロー
ラ部 291 …29ｎ ローラ部 RW ローラ部291 …29ｎのローラ幅 Ｇ 各ローラ部291 …29ｎの( 小 )間隔 RP 用紙挟持領域 V1 本発明の定着器直後の用紙搬送ローラにおけるロー
ラ部の周速 V2 定着器の熱ローラの周速 30 分離爪 31 オイルローラ 32 ゴムローラの間隔 33 従来の用紙ガイド 34 本発明による用紙ガイド 39 用紙搬送路 40 連結棒1 Photosensitive Drum 4 Transfer Device 13 Fixing Device 13a Heat Roller 13b Pressure Roller 14 Paper Conveying Roller 10,11,15,16,21,22,23 Immediately after the conventional fixing device Paper Conveying Roller 24 Reverse Runway 25 Roller Shaft 26 Rubber Roller 27 Paper 28 Paper transport roller 28R immediately after the fixing device proposed previously 28R Paper transport roller immediately after the fixing device according to the present invention 29R Roller portion 29 1 of the paper transport roller immediately after the fixing device of the present invention 29 1 ... 29n Roller portion RW Roller portion 29 1 ... 29n roller width G Each roller part 29 1 ... 29n (small) interval RP Paper nip area V 1 Peripheral speed of roller part of paper conveying roller immediately after fixing device of the present invention V 2 Peripheral speed of heat roller of fixing device 30 Separation Claw 31 Oil Roller 32 Rubber Roller Spacing 33 Conventional Paper Guide 34 Paper Guide According to the Present Invention 39 Paper Feed Path 40 Connecting Rod
Claims (2)
当該用紙(27)が表裏反転されて再び転写部に移送され、
裏面にもトナー像を転写して定着する両面印刷装置にお
いて、 熱定着器の直後の用紙搬送ローラ(28R) が、ローラ軸(2
5)とその外周に設けたゴムや樹脂などからなるローラ部
(29R) とで構成されていること、 該ローラ部(29R) は、複数のローラ部(291…29n)を小間
隔(G) をおいて配設されており、各小間隔(G) に用紙ガ
イド(34)が進入していること、 ローラ部(29R) の用紙挟持領域(RP)において、用紙幅
(P) の少なくとも半分以上がローラ部(29R) と接するよ
うに、前記ローラ部(291…29n)の間隔部(G) の総和より
ローラ部(291…29n)の幅(RW)の総和を大きくしたこと、 を特徴とする両面印刷装置。1. After printing on one side of the paper (27),
The paper (27) is turned upside down and transferred to the transfer section again,
In a double-sided printing device that also transfers and fixes the toner image on the back side, the paper transport roller (28R) immediately after the heat fixing device is
5) and the roller part made of rubber or resin provided around it
(29R), the roller portion (29R) has a plurality of roller portions (29 1 ... 29n) arranged at small intervals (G), and each small interval (G). The paper guide (34) has entered the paper, and the paper width in the paper nipping area (RP) of the roller (29R).
As above, at least half of (P) is in contact with the roller portion (29R), the width of the roller portion than the sum of the spacing portion of the roller portion (29 1 ... 29n) (G ) (29 1 ... 29n) of (RW) A double-sided printing device characterized by a larger total sum.
熱ローラ定着構造とし、定着器直後の用紙搬送ローラ(2
8R) のローラ部(29R) の周速が、定着器の熱ローラ(13
a) の周速よりも相対的に速くなるように構成されてい
ることを特徴とする両面印刷装置。2. The invention according to claim 1, wherein the fixing device has a heat roller fixing structure, and the sheet conveying roller (2
The peripheral speed of the roller section (29R) of (8R) is
A double-sided printing device characterized by being configured to be relatively faster than the peripheral speed of a).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03197877A JP3078360B2 (en) | 1991-08-07 | 1991-08-07 | Double-sided printing apparatus and mechanism therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03197877A JP3078360B2 (en) | 1991-08-07 | 1991-08-07 | Double-sided printing apparatus and mechanism therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0540430A true JPH0540430A (en) | 1993-02-19 |
| JP3078360B2 JP3078360B2 (en) | 2000-08-21 |
Family
ID=16381807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03197877A Expired - Fee Related JP3078360B2 (en) | 1991-08-07 | 1991-08-07 | Double-sided printing apparatus and mechanism therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3078360B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003043846A (en) * | 2001-07-30 | 2003-02-14 | Ricoh Co Ltd | Fixing device and image forming device provided therewith |
-
1991
- 1991-08-07 JP JP03197877A patent/JP3078360B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003043846A (en) * | 2001-07-30 | 2003-02-14 | Ricoh Co Ltd | Fixing device and image forming device provided therewith |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3078360B2 (en) | 2000-08-21 |
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