JPH05224548A - Transfer paper carrying device - Google Patents

Transfer paper carrying device

Info

Publication number
JPH05224548A
JPH05224548A JP4028450A JP2845092A JPH05224548A JP H05224548 A JPH05224548 A JP H05224548A JP 4028450 A JP4028450 A JP 4028450A JP 2845092 A JP2845092 A JP 2845092A JP H05224548 A JPH05224548 A JP H05224548A
Authority
JP
Japan
Prior art keywords
transfer
transfer paper
paper
pressure roller
heating 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.)
Granted
Application number
JP4028450A
Other languages
Japanese (ja)
Other versions
JP3273413B2 (en
Inventor
Masahiro Ishino
正浩 石野
Hiroshi Yamamoto
博 山本
Naoto Yamanaka
尚登 山中
Makoto Tanaka
田中  誠
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.)
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox 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 Fuji Xerox Co Ltd filed Critical Fuji Xerox Co Ltd
Priority to JP02845092A priority Critical patent/JP3273413B2/en
Publication of JPH05224548A publication Critical patent/JPH05224548A/en
Application granted granted Critical
Publication of JP3273413B2 publication Critical patent/JP3273413B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE:To stably carry a long size transfer paper, and to prevent the occurrence of the wrinkles of the transfer paper at the time of fixing and of a failure in a transfer, with a simple constitution. CONSTITUTION:The long size transfer paper (tracing paper) 12 is carried at a speed by which the wrinkles and the irregularities in a transferred image do not occur, until the long-size transfer paper 12 is nipped between a heating roller 15a and a pressure roller 15b. After the leading edge of the transfer paper 12 is nipped between the heating roller 15a and the pressure roller 15b, the drive of a vacuum carrier 16 is stopped. Thus, the transfer paper 12 has constant tensile force, so that it is made into a straight line, and not loosened. Therefore, the occurrence of the wrinkles and the failure in the transfer can be prevented.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、可視像(トナー像)が
感光体から転写された後の転写紙を定着装置へ案内する
転写紙搬送装置に係り、特に幅の広い大サイズの転写紙
を搬送する転写紙搬送装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer paper conveying device for guiding a transfer paper after a visible image (toner image) has been transferred from a photosensitive member to a fixing device, and particularly to a wide transfer device having a large size. The present invention relates to a transfer paper transport device that transports paper.

【0002】[0002]

【従来の技術】一般に、電子複写機や画像記録装置のよ
うに、乾式トナーを用いる画像形成装置においては、感
光体ドラム等の画像担持体に形成されたトナー像を転写
紙に転写し、その転写紙を、定着装置に向けて転写紙搬
送装置により搬送し、この定着装置において、熱や圧力
を加えることによりトナーを溶融させて定着が行われ
る。
2. Description of the Related Art Generally, in an image forming apparatus using a dry toner such as an electronic copying machine or an image recording apparatus, a toner image formed on an image bearing member such as a photosensitive drum is transferred onto a transfer paper, The transfer paper is conveyed toward the fixing device by the transfer paper conveying device, and the fixing device melts the toner by applying heat or pressure to fix the transfer paper.

【0003】定着装置としては、一般に加圧ローラと加
熱ローラとの間に転写紙をニップ(挟持)させて熱と圧
力により定着を行う加熱ローラ方式のものが採用されて
いる。
As a fixing device, a heating roller type fixing device is generally used in which a transfer paper is nipped (sandwiched) between a pressure roller and a heating roller to fix the transfer paper by heat and pressure.

【0004】このような画像形成装置においては、転写
紙搬送装置として転写紙の未定着トナー画像担持側に影
響を与えることがないように、その裏面から吸引してベ
ルト等により搬送を行う真空(バキューム)搬送装置が
用いられる。そして、このようにして搬送された転写紙
を、転写紙ガイド部材(バッフル)により加熱ローラと
加圧ローラとの間のニップ点に導くようになっている。
In such an image forming apparatus, as a transfer paper transporting device, a vacuum (sucking from the back surface of the transfer paper and carrying it by a belt or the like so as not to affect the unfixed toner image carrying side of the transfer paper). A vacuum carrying device is used. The transfer sheet thus conveyed is guided to a nip point between the heating roller and the pressure roller by a transfer sheet guide member (baffle).

【0005】ところで、この種の画像形成装置において
は、転写紙にしわが発生すると良好な転写と定着が行わ
れない。このため、従来の画像形成装置では、たとえば
実公平3-42448 号公報にも説明されているように、給紙
部の線速と、感光体ドラムの線速と、真空搬送装置の線
速と、定着装置の線速との間を一定の関係に設定するこ
とにより、転写紙の搬送速度を制御している。
By the way, in this type of image forming apparatus, if wrinkles occur on the transfer paper, good transfer and fixing cannot be performed. Therefore, in the conventional image forming apparatus, as described in, for example, Japanese Utility Model Publication No. 3-42448, the linear velocity of the sheet feeding portion, the linear velocity of the photosensitive drum, and the linear velocity of the vacuum transfer device are set. , The linear speed of the fixing device is set to a constant relationship to control the transfer paper transport speed.

【0006】しかしながら、定着装置においては、加圧
ローラと加熱ローラとの間における軸方向の左右のニッ
プバランスや温度差などの、調整で抑えることのできな
い軸方向のわずかな左右差がある。このため転写紙の長
さが数mとなるような大サイズのものである場合には、
上述の速度比を設定するだけでは、定着装置において転
写紙を安定して直進させることができず、このため定着
装置の直前で転写紙の左右のいずれかにゆるみが発生す
る。このゆるみにより転写紙にしわが発生し、またその
ゆるみが大きいとそれが転写部まで影響を及ぼし、像の
欠落等の転写不良が発生する。
However, in the fixing device, there is a slight left-right difference in the axial direction that cannot be suppressed by adjustment, such as a left-right axial nip balance between the pressure roller and the heating roller and a temperature difference. Therefore, if the transfer paper is a large size such as several meters long,
Only by setting the above-mentioned speed ratio, the transfer sheet cannot be stably moved straight in the fixing device, and therefore, the slack is generated on either the right or left side of the transfer sheet immediately before the fixing device. The looseness causes wrinkles on the transfer paper, and if the looseness is large, the wrinkles affect the transfer portion, resulting in defective transfer such as image loss.

【0007】このような問題を解決するため、従来、実
公平3-42448 号公報では、搬送部を2つ設けた転写紙搬
送装置が提案されている。この転写搬送装置では、転写
紙の先端部の位置によりその搬送速度を変えることによ
り、長尺の転写紙を安定して複写することを可能にして
いる。
In order to solve such a problem, conventionally, Japanese Utility Model Publication No. 3-42448 proposes a transfer sheet conveying device provided with two conveying portions. In this transfer / transport device, the transfer speed is changed depending on the position of the leading end of the transfer paper, so that a long transfer paper can be stably copied.

【0008】[0008]

【発明が解決しようとする課題】しかしながら、この従
来の転写紙搬送装置では、搬送部を2つ設ける必要があ
るため、装置自体が大型化し、かつ高価になるという問
題があった。
However, in this conventional transfer paper transporting device, since it is necessary to provide two transporting parts, there is a problem that the device itself becomes large and expensive.

【0009】本発明はかかる問題点に鑑みてなされたも
ので、その目的は、簡単な構成で、長尺の転写紙を安定
して搬送でき、転写紙が定着装置にニップされた後のし
わの発生を防止し、かつ転写不良の発生を防止できる安
価な転写紙搬送装置を提供することにある。
The present invention has been made in view of the above problems, and an object thereof is to make it possible to stably convey a long transfer sheet with a simple structure and to prevent wrinkles after the transfer sheet is nipped by a fixing device. It is an object of the present invention to provide an inexpensive transfer paper conveyance device that can prevent the occurrence of transfer defects and the occurrence of transfer defects.

【0010】[0010]

【課題を解決するための手段】本発明による転写紙搬送
装置は、可視像が感光体から転写された転写紙を、加熱
ローラと加圧ローラからなる定着装置へ、前記転写紙に
ゆるみが発生しない程度にかつ転写像に乱れが発生しな
い程度の線速をもって搬送する転写紙搬送手段と、前記
転写紙の先端部が前記加熱ローラと加圧ローラとの間に
ニップされたことを検出するニップ状態検出手段と、こ
のニップ状態検出手段により前記転写紙の先端部がニッ
プされたことが検出されたときに、前記転写紙搬送手段
の駆動を停止し、前記転写紙に一定の張力を発生させる
張力発生手段とを備えている。
In a transfer paper conveying device according to the present invention, a transfer paper on which a visible image is transferred from a photoconductor is transferred to a fixing device composed of a heating roller and a pressure roller, and the transfer paper is loosened. Detecting that the transfer sheet conveying means that conveys at a linear velocity that does not cause the transfer image to be disturbed and that the leading end of the transfer sheet is nipped between the heating roller and the pressure roller When the nip state detecting means detects that the leading end of the transfer sheet is nipped by the nip state detecting means, the driving of the transfer sheet conveying means is stopped and a constant tension is generated on the transfer sheet. And a tension generating means for controlling the tension.

【0011】この転写紙搬送装置においては、転写紙の
先端部が前記加熱ローラと加圧ローラとの間にニップさ
れる前においては、転写紙は転写紙搬送手段によりゆる
みが発生しない程度にかつ転写像に乱れが発生しない程
度の線速をもって搬送される。そして、転写紙の先端部
が加熱ローラと加圧ローラとの間にニップされ、このニ
ップ状態が検出された後、転写紙搬送手段の駆動が停止
される。その結果、転写紙と転写紙搬送手段との間に摩
擦が発生し、その抵抗により転写紙に一定の張力が発生
する。この張力により定着装置では転写紙を安定して直
進させることができ、前述の加圧ローラと加熱ローラと
の間における軸方向の左右のニップバランスや温度差な
どの、調整で抑えることのできない軸方向のわずかな左
右差があっても、転写紙にゆるみが発生することがなく
なる。したがって、転写紙のしわ、および転写不良の発
生を防止することができる。
In this transfer sheet conveying device, before the leading end of the transfer sheet is nipped between the heating roller and the pressure roller, the transfer sheet is prevented from being loosened by the transfer sheet conveying means. The transferred image is conveyed at a linear velocity that does not disturb the transferred image. Then, the leading end of the transfer sheet is nipped between the heating roller and the pressure roller, and after the nip state is detected, the driving of the transfer sheet conveying means is stopped. As a result, friction is generated between the transfer sheet and the transfer sheet conveying means, and a constant tension is generated on the transfer sheet due to the resistance. With this tension, the transfer paper can be stably moved straight in the fixing device, and the axial nip balance and temperature difference between the pressure roller and the heating roller that cannot be adjusted by adjustment, such as the temperature difference. Even if there is a slight left-right difference in direction, the transfer paper will not loosen. Therefore, it is possible to prevent wrinkles of the transfer paper and occurrence of transfer defects.

【0012】[0012]

【実施例】以下、本発明の実施例を図面を参照して説明
する。
Embodiments of the present invention will be described below with reference to the drawings.

【0013】図1は本発明の一実施例に係る転写紙搬送
装置の構成を表すものである。
FIG. 1 shows the structure of a transfer sheet conveying apparatus according to an embodiment of the present invention.

【0014】この転写紙搬送装置は、給紙ローラ10を
備えた給紙装置11から、転写紙12を、駆動ローラ1
3aとピンチローラ13bとからなる搬送ローラ対13
により、感光体ドラム14の転写部へ送り込む。感光体
ドラム14からトナー像が転写された転写紙12は、感
光体ドラム14と定着装置15との間に配設された真空
搬送装置16、および転写紙ガイド部材17とにより定
着装置15へ搬送され定着が行われる。定着装置15
は、加熱ローラ15aと加圧ローラ15bとの間に転写
紙12をニップ(挟持)させて熱と圧力により定着を行
うものである。
In this transfer paper conveying device, a transfer paper 12 is transferred from a paper supply device 11 having a paper supply roller 10 to a drive roller 1.
Conveying roller pair 13 including 3a and pinch roller 13b
Then, it is sent to the transfer portion of the photosensitive drum 14. The transfer paper 12 on which the toner image is transferred from the photoconductor drum 14 is carried to the fixing device 15 by a vacuum carrying device 16 arranged between the photoconductor drum 14 and the fixing device 15 and a transfer paper guide member 17. And fixing is performed. Fixing device 15
Is for fixing the transfer paper 12 with heat and pressure by nipping (holding) the transfer paper 12 between the heating roller 15a and the pressure roller 15b.

【0015】ここで、感光体ドラム14の線速をV1
定着装置15の加圧ローラ15aと加熱ローラ15bと
のニップ点での線速をV2 、真空搬送装置16の線速を
3、給紙部11の線速をV4 とすると、これらの関係
は、転写紙12が加熱ローラ15aと加圧ローラ15b
との間にニップされる前は、次式のように設定される。
Here, the linear velocity of the photosensitive drum 14 is V 1 ,
Assuming that the linear velocity at the nip point between the pressure roller 15a and the heating roller 15b of the fixing device 15 is V 2 , the linear velocity of the vacuum transfer device 16 is V 3 , and the linear velocity of the paper feeding unit 11 is V 4 , these The relationship is that the transfer paper 12 has a heating roller 15a and a pressure roller 15b.
Before being nipped between and, the following equation is set.

【0016】[0016]

【数1】V3 >V2 >V1 ≧V4 の関係に設定される。## EQU1 ## V 3 > V 2 > V 1 ≧ V 4 is set.

【0017】すなわち、V2 およびV3 は転写紙12に
しわが発生することなく、かつ転写像に乱れが生じない
程度にV1 に対して線速を速めることにより、転写紙1
2を定着装置15側で引っ張るものである。より具体的
には、V2 は、
That is, V 2 and V 3 are increased by increasing the linear velocity with respect to V 1 to such an extent that wrinkles do not occur on the transfer paper 12 and the transfer image is not disturbed.
2 is pulled by the fixing device 15 side. More specifically, V 2 is

【0018】[0018]

【数2】V1 ×1.004≧V2 >V1 の範囲に設定される。## EQU2 ## It is set in the range of V 1 × 1.004 ≧ V 2 > V 1 .

【0019】なお、これら各部の速度は、図示しないが
搬送経路の各部にセンサを設け、これらセンサにより転
写紙12の到達を検出し、その検出状況に応じて各部の
駆動部の制御を行うことにより調整することができる。
Although not shown, the speed of each of these parts is provided with a sensor at each part of the conveyance path, and the arrival of the transfer paper 12 is detected by these sensors, and the drive part of each part is controlled according to the detected condition. Can be adjusted by.

【0020】真空搬送装置16は、バキュームファン1
8を備え、このファン18により転写紙12を転写走行
面に吸着させながら、搬送させるようになっている。転
写紙走行面は、搬送ローラ19、20、21により形成
されている。搬送ローラ19にはベルト22およびクラ
ッチ23を介して図示しないモータの回転力が伝達され
るようになっている。この搬送ローラ19の回転力はさ
らに、ベルト24を介して搬送ローラ20、21に順次
伝達されるようになっている。
The vacuum transfer device 16 is a vacuum fan 1.
8, the transfer paper 12 is conveyed while being attracted to the transfer traveling surface by the fan 18. The transfer paper traveling surface is formed by the transport rollers 19, 20, and 21. The rotational force of a motor (not shown) is transmitted to the transport roller 19 via a belt 22 and a clutch 23. The rotational force of the transport roller 19 is further transmitted to the transport rollers 20, 21 via the belt 24 in order.

【0021】感光体ドラム14の転写部には、転写コロ
トロン25および分離コロトロン26がそれぞれ感光体
ドラム14に対向して配設されている。給紙部11より
送り出された転写紙12は、感光体ドラム14に接触す
るとともに転写コロトロン25によりトナー像が転写さ
れる。トナー像が転写された転写紙12は分離コロトロ
ン26により感光体ドラム14面から剥離される。
At the transfer portion of the photoconductor drum 14, a transfer corotron 25 and a separation corotron 26 are arranged so as to face the photoconductor drum 14, respectively. The transfer paper 12 delivered from the paper supply unit 11 comes into contact with the photosensitive drum 14, and the toner image is transferred by the transfer corotron 25. The transfer paper 12 on which the toner image has been transferred is separated from the surface of the photosensitive drum 14 by the separation corotron 26.

【0022】感光体ドラム14から剥離された転写紙1
2は、真空搬送装置16により矢印Aに示すように搬送
される。真空搬送装置16を通過した転写紙12は、転
写紙ガイド部材17によりその先端が、定着装置15の
加熱ローラ15aと加圧ローラ15bとの間の接触部
(ニップ点)に導かれるようになっている。加熱ローラ
15aおよび加圧ローラ15bの下流側には転写紙検出
センサ27が配設されており、ニップ点を通過した転写
紙12の先端の到達を検出するようになっている。
Transfer paper 1 separated from the photosensitive drum 14
2 is carried by the vacuum carrying device 16 as shown by an arrow A. The transfer paper 12 that has passed through the vacuum transfer device 16 is guided by the transfer paper guide member 17 so that its front end is guided to the contact portion (nip point) between the heating roller 15a and the pressure roller 15b of the fixing device 15. ing. A transfer paper detection sensor 27 is arranged downstream of the heating roller 15a and the pressure roller 15b, and detects the arrival of the leading end of the transfer paper 12 that has passed through the nip point.

【0023】転写紙検出センサ27により転写紙12の
先端が検出され、転写紙12が定着装置15にニップさ
れたことが確認された場合には、転写紙検出センサ27
の検出信号は図示しない制御部に送られ、この制御部の
制御により真空搬送装置16のクラッチ23がオフする
ようになっている。これにより搬送ローラ19、20、
21の駆動が停止し、前述の線速V3 が零となる。その
結果、転写紙12に摩擦力が発生し、転写紙12には加
熱ローラ15aと加圧ローラ15bとの間のニップ点と
真空搬送装置16と間の部分に一定の張力が生じるよう
になっている。
When the transfer paper detection sensor 27 detects the leading edge of the transfer paper 12 and it is confirmed that the transfer paper 12 is nipped by the fixing device 15, the transfer paper detection sensor 27
Is sent to a control unit (not shown), and the clutch 23 of the vacuum transfer device 16 is turned off under the control of this control unit. As a result, the transport rollers 19, 20,
The driving of 21 is stopped, and the above-mentioned linear velocity V 3 becomes zero. As a result, a frictional force is generated on the transfer paper 12, and a constant tension is generated on the transfer paper 12 at a portion between the nip point between the heating roller 15a and the pressure roller 15b and the vacuum transfer device 16. ing.

【0024】搬送ローラ19、20、21により形成さ
れる転写紙走行面、および転写紙ガイド部材17の表面
(案内面)は、それぞれ感光体ドラム14の転写部と、
加熱ローラ15aと加圧ローラ15bとの間のニップ点
を結ぶ線Pよりも若干上の位置に設定されており、クラ
ッチ23がオフしたときに転写紙12に十分な張力が発
生するようになっている。
The transfer paper running surface formed by the transport rollers 19, 20, and 21 and the surface (guide surface) of the transfer paper guide member 17 are respectively the transfer portion of the photosensitive drum 14,
It is set at a position slightly above the line P connecting the nip point between the heating roller 15a and the pressure roller 15b, and a sufficient tension is generated on the transfer paper 12 when the clutch 23 is turned off. ing.

【0025】次に、このように構成された本実施例の転
写紙搬送装置の動作を説明する。
Next, the operation of the transfer sheet conveying apparatus of this embodiment having the above-mentioned structure will be described.

【0026】まず、転写紙12が定着装置15にニップ
されるまでは、各部の線速は図1に示したように、式1
で示した関係に設定される。この条件下、給紙部11か
ら搬送されてきた転写紙12は、転写コロトロン25に
より感光体ドラム14からトナー像が転写された後、真
空搬送装置16の搬送ローラ19〜21により定着装置
15方向へ搬送される。
First, until the transfer paper 12 is nipped by the fixing device 15, the linear velocities of the respective parts are expressed by the formula 1 as shown in FIG.
It is set to the relationship shown in. Under this condition, the transfer paper 12 conveyed from the paper supply unit 11 has a toner image transferred from the photosensitive drum 14 by the transfer corotron 25, and then is conveyed by the conveyance rollers 19 to 21 of the vacuum conveyance device 16 to the fixing device 15 direction. Be transported to.

【0027】真空搬送装置16を通過した転写紙12の
先端は、転写紙ガイド部材17により定着装置15のニ
ップ点に導かれる。このとき転写紙12の先端部は加熱
ローラ15aに突き当たった後、ニップ点に導かれる。
転写紙12の先端部がニップ点を通過し、転写紙検出セ
ンサ27に到達すると、この転写紙検出センサ27がオ
ンする。これにより真空搬送装置16のクラッチ23が
オフし、搬送ローラ19〜21の駆動が停止し、図2に
示したように、その部分の線速V3 が零となる。その結
果、転写紙12と搬送ローラ19〜21との間に摩擦が
発生し、その抵抗により転写紙12に一定の張力が発生
する。
The leading end of the transfer paper 12 that has passed through the vacuum transfer device 16 is guided to the nip point of the fixing device 15 by the transfer paper guide member 17. At this time, the leading end of the transfer paper 12 hits the heating roller 15a and is then guided to the nip point.
When the leading end of the transfer paper 12 passes through the nip point and reaches the transfer paper detection sensor 27, the transfer paper detection sensor 27 is turned on. Thus the clutch 23 of the vacuum transfer apparatus 16 is turned off, the drive stops the conveying roller 19 to 21, as shown in FIG. 2, the linear velocity V 3 of the part becomes zero. As a result, friction is generated between the transfer paper 12 and the transport rollers 19 to 21, and a constant tension is generated on the transfer paper 12 due to the resistance.

【0028】このように本実施例の転写紙搬送装置で
は、転写紙12が加熱ローラ15aと加圧ローラ15b
との間にニップされるまでは、式1に示した線速で各部
が駆動される結果、転写紙12は転写像に乱れが発生し
ない程度の速度をもって搬送される。そして、転写紙1
2の先端部が加熱ローラ15aと加圧ローラ15bとの
間にニップされた後は、真空搬送装置16の駆動が停止
され、転写紙12に一定の張力が発生する。
As described above, in the transfer sheet conveying apparatus according to the present embodiment, the transfer sheet 12 has the heating roller 15a and the pressure roller 15b.
As a result of the respective parts being driven at the linear velocity shown in Expression 1 until the nip between the sheet and the sheet, the transfer paper 12 is conveyed at a speed at which the transfer image is not disturbed. And the transfer paper 1
After the leading end of the sheet 2 is nipped between the heating roller 15a and the pressure roller 15b, the driving of the vacuum transfer device 16 is stopped and a constant tension is generated on the transfer paper 12.

【0029】この張力により定着装置15では転写紙1
2を安定して直進させることができ、加熱ローラ15a
と加圧ローラ15bとの間における軸方向の左右のニッ
プバランスや温度差などの、調整で抑えることのできな
い軸方向のわずかな左右差があっても、転写紙12にゆ
るみが発生することがなくなる。このため定着装置15
では転写紙12を安定して直進させることができ、加熱
ローラ15aと加圧ローラ15bによる定着が安定して
行われる。また、転写紙12の長さが数mの長尺サイズ
になる場合でも、しわが発生することがなく、転写不良
の発生も防止できる。このように本実施例では、長尺サ
イズの転写紙12にしわが発生することなく、しかも転
写不良が発生することのない転写紙搬送装置を簡単な構
成で、安価に提供できる。
This tension causes the fixing device 15 to transfer the transfer paper 1
2 can be stably moved straight, and heating roller 15a
Even if there is a slight left-right difference in the axial direction that cannot be suppressed by adjustment, such as a left-right axial nip balance between the pressure roller 15b and the pressure roller 15b, a temperature difference, etc., the transfer paper 12 may become loose. Disappear. Therefore, the fixing device 15
Then, the transfer paper 12 can be stably moved straight, and the fixing by the heating roller 15a and the pressure roller 15b is stably performed. Further, even when the length of the transfer paper 12 is a long size of several meters, wrinkles do not occur and transfer defects can be prevented. As described above, in the present embodiment, the transfer paper transporting device which does not cause wrinkles on the long-sized transfer paper 12 and does not cause transfer failure can be provided at a low cost with a simple configuration.

【0030】なお、連続複写を行う場合には、次の転写
紙が真空搬送装置16へ到達するまでにクラッチ23が
オンし、真空搬送装置16を駆動させるようにすればよ
い。
When continuous copying is performed, the clutch 23 may be turned on and the vacuum transfer device 16 may be driven before the next transfer sheet reaches the vacuum transfer device 16.

【0031】[0031]

【発明の効果】以上説明したように本発明に係る転写紙
搬送装置によれば、転写紙の先端部が前記加熱ローラと
加圧ローラとの間にニップされる前においては、転写紙
を転写紙搬送手段によりゆるみが発生しない程度にかつ
転写像に乱れが発生しない程度の線速をもって搬送する
とともに、転写紙の先端部が加熱ローラと加圧ローラと
の間にニップされ、このニップ状態が検出された後は、
転写紙搬送手段の駆動を停止し、転写紙に一定の張力を
発生させるようにしたので、定着装置では転写紙を安定
して直進させることができる。したがって、加圧ローラ
と加熱ローラとの間における軸方向の左右のニップバラ
ンスや温度差などの、調整で抑えることのできない軸方
向のわずかな左右差があっても、転写紙にゆるみが発生
することがなくなるなり、転写紙のしわおよび転写不良
の発生を防止することができる。また、構成が極めて簡
単であるので、安価な転写紙搬送装置を実現できるとい
う効果がある。
As described above, according to the transfer sheet conveying device of the present invention, the transfer sheet is transferred before the leading end of the transfer sheet is nipped between the heating roller and the pressure roller. The paper is conveyed at a linear velocity that does not cause slack by the paper conveying means and does not disturb the transferred image, and the leading end of the transfer paper is nipped between the heating roller and the pressure roller. After being detected,
Since the driving of the transfer sheet conveying means is stopped and a constant tension is generated on the transfer sheet, the transfer sheet can be stably moved straight in the fixing device. Therefore, even if there is a slight left-right difference in the axial direction that cannot be suppressed by adjustment, such as a left-right nip balance in the axial direction between the pressure roller and the heating roller and a temperature difference, the transfer paper is loosened. And the occurrence of wrinkles and transfer defects on the transfer paper can be prevented. Further, since the structure is extremely simple, there is an effect that an inexpensive transfer sheet conveying device can be realized.

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

【図1】 本発明の一実施例に係る転写紙搬送装置にお
ける転写紙のニップ前の搬送状態を表す図である。
FIG. 1 is a diagram illustrating a transfer state of a transfer sheet before a nip in a transfer sheet transfer device according to an embodiment of the present invention.

【図2】 図1の転写紙搬送装置における転写紙のニッ
プ後の搬送状態を表す図である。
FIG. 2 is a diagram showing a transfer state of a transfer sheet after nip in the transfer sheet transfer device of FIG.

【符号の説明】[Explanation of symbols]

10…給紙ロール、11…給紙装置、12…転写紙、1
4…感光体ドラム、15…定着装置、15a…加熱ロー
ラ、15b…加圧ローラ、16…真空搬送装置、19〜
21…搬送ローラ、23…クラッチ、27…転写紙検出
センサ
10 ... Paper feeding roll, 11 ... Paper feeding device, 12 ... Transfer paper, 1
4 ... Photosensitive drum, 15 ... Fixing device, 15a ... Heating roller, 15b ... Pressure roller, 16 ... Vacuum transport device, 19 ...
21 ... Conveying roller, 23 ... Clutch, 27 ... Transfer paper detection sensor

───────────────────────────────────────────────────── フロントページの続き (72)発明者 田中 誠 埼玉県岩槻市府内3丁目7番1号 富士ゼ ロックス株式会社岩槻事業所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Makoto Tanaka 3-7-1 Fuchu, Iwatsuki City, Saitama Prefecture Fuji Xerox Co., Ltd. Iwatsuki Office

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 可視像が感光体から転写された転写紙
を、加熱ローラと加圧ローラからなる定着装置へ、前記
転写紙にゆるみが発生しない程度にかつ転写像に乱れが
発生しない程度の線速をもって搬送する転写紙搬送手段
と、 前記転写紙の先端部が前記加熱ローラと加圧ローラとの
間にニップされたことを検出するニップ状態検出手段
と、 このニップ状態検出手段により前記転写紙の先端部がニ
ップされたことが検出されたときに、前記転写紙搬送手
段の駆動を停止し、前記転写紙に一定の張力を発生させ
る張力発生手段とを備えたことを特徴とする転写紙搬送
装置。
1. A transfer sheet having a visible image transferred from a photoconductor to a fixing device comprising a heating roller and a pressure roller, to the extent that the transfer sheet is not loosened and the transfer image is not disturbed. Transfer paper conveying means for conveying the transfer paper at a linear velocity of, and a nip state detecting means for detecting that the leading end portion of the transfer paper is nipped between the heating roller and the pressure roller, and the nip state detecting means When it is detected that the leading end of the transfer sheet is nipped, the drive unit is stopped, and a tension generating unit that generates a constant tension on the transfer sheet is provided. Transfer paper transport device.
JP02845092A 1992-02-14 1992-02-14 Image forming device Expired - Fee Related JP3273413B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP02845092A JP3273413B2 (en) 1992-02-14 1992-02-14 Image forming device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP02845092A JP3273413B2 (en) 1992-02-14 1992-02-14 Image forming device

Publications (2)

Publication Number Publication Date
JPH05224548A true JPH05224548A (en) 1993-09-03
JP3273413B2 JP3273413B2 (en) 2002-04-08

Family

ID=12249007

Family Applications (1)

Application Number Title Priority Date Filing Date
JP02845092A Expired - Fee Related JP3273413B2 (en) 1992-02-14 1992-02-14 Image forming device

Country Status (1)

Country Link
JP (1) JP3273413B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5809390A (en) * 1996-10-15 1998-09-15 International Business Machines Corporation Device for controlling pinless paper movement in a continuous forms printer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5809390A (en) * 1996-10-15 1998-09-15 International Business Machines Corporation Device for controlling pinless paper movement in a continuous forms printer

Also Published As

Publication number Publication date
JP3273413B2 (en) 2002-04-08

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