JPS62161157A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPS62161157A JPS62161157A JP61003186A JP318686A JPS62161157A JP S62161157 A JPS62161157 A JP S62161157A JP 61003186 A JP61003186 A JP 61003186A JP 318686 A JP318686 A JP 318686A JP S62161157 A JPS62161157 A JP S62161157A
- Authority
- JP
- Japan
- Prior art keywords
- transfer material
- circumferential speed
- fixing roller
- transfer
- speed
- 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
- Fixing For Electrophotography (AREA)
- Paper Feeding For Electrophotography (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、電子写真方式や熱転写方式等を利用して、画
像を転写材上に形成してハードコピーを得る複写機、フ
ァクシミリ、プリンタ等の画像形成装置に関する。Detailed Description of the Invention (Industrial Field of Application) The present invention is applicable to copiers, facsimile machines, printers, etc. that use electrophotography, thermal transfer, etc. to form an image on a transfer material to obtain a hard copy. The present invention relates to an image forming apparatus.
（従来の技術）
従来、電子写真機のような画像形成装置においては、給
紙から転写、定着を経て装置外に画像を形成した転写材
を排出するというような一連の搬送経過を有するのが通
常である。この場合、搬送経路を構成する各要素の搬送
速度の差が生じると、画像品位を低下させることがあつ
念。これは、例えば第５図に示すような電子写真装置に
おいて、像担持体としての感光ドラム１０２上のトナー
像は、帯電器１０３の作用で転写部１０４にて転写材に
転写され、この転写時の帯電器１０３から発するコロナ
によって感光ドラム１０２の搬送力が生ずる。ここで、
この搬送力は、静電的な吸着力によるものであって、搬
送ローラ１１０や定着ローラ１０１のように複数のロー
ラを相互に押圧させて、該ローラ間に転写材を挾持して
搬送する構成のものと比較して、その搬送力は非常に小
さい。(Prior Art) Conventionally, an image forming apparatus such as an electrophotographic machine has a series of conveyance processes, such as paper feeding, transfer, fixing, and discharge of the transfer material with an image formed outside the apparatus. Normal. In this case, if there is a difference in the conveyance speed of each element composing the conveyance path, image quality may be degraded. This is because, for example, in an electrophotographic apparatus as shown in FIG. A conveyance force for the photosensitive drum 102 is generated by the corona generated from the charger 103 . here,
This conveyance force is due to electrostatic adsorption force, and a plurality of rollers such as the conveyance roller 110 and the fixing roller 101 are pressed against each other, and the transfer material is conveyed while being held between the rollers. Its conveying force is very small compared to that of
この場合、搬送ローラ１１０に関しては、転写材の先端
が転写部１０４に至った時点で、搬送ローラ１１０の駆
動力を、例えばクラッチ等を使用してこれを解除するこ
とによって、その影りを排除することができる。In this case, regarding the conveyance roller 110, when the leading edge of the transfer material reaches the transfer section 104, the driving force of the conveyance roller 110 is released using, for example, a clutch, thereby eliminating the shadow. can do.
しかしながら、定着ローラ１０１は、一般的に２本のロ
ーラを対向圧接させ、該２本のローラ間に転写材を挾持
搬送させて未定着トナーの定着を行なうため、定着ロー
ラ１０１の搬送力は、感光ドラム１０２の搬送力と比較
して非常に大きいのが通常である。このため、転写部１
０４と定着ローラ１０１との双方に同一の転写材がかか
った場合であって、定着ローラ１０１の周速が感光ドラ
ム１０２の周速より速い場合には、転写材が定着ローラ
１０１により引張られ、転写部１０４ですべりが生じ、
転写材上において転写すれとなってあられれてしまう。However, the fixing roller 101 generally has two rollers facing each other in pressure contact, and the transfer material is conveyed between the two rollers to fix the unfixed toner. Therefore, the conveying force of the fixing roller 101 is Normally, the conveying force of the photosensitive drum 102 is very large. For this reason, the transfer section 1
04 and the fixing roller 101, and when the circumferential speed of the fixing roller 101 is faster than the circumferential speed of the photosensitive drum 102, the transfer material is pulled by the fixing roller 101, Slip occurs in the transfer section 104,
The transfer material ends up being blurred on the transfer material.
また、第６図は複数の像担持体を使用したフルカラー画
像形成装置を示し、この装置では、カセツ）１０６内の
転写材が搬送ベルト１０５に静電吸着され、感光ドラム
１２０，１３０，１４０を次々と通過して、これらＫよ
ってシアン、マゼンタ、イエローの各色が転写され、フ
ルカラー画像を形成した後、定着ローラ１０１により画
像が定着され、完成した画像出力が装置外に排出される
。Further, FIG. 6 shows a full-color image forming apparatus using a plurality of image carriers. In this apparatus, the transfer material in the cassette 106 is electrostatically attracted to the conveyor belt 105, and the photosensitive drums 120, 130, 140 are After passing through one after another, each color of cyan, magenta, and yellow is transferred by these K to form a full-color image, and then the image is fixed by the fixing roller 101, and the completed image output is discharged from the apparatus.
また、この装置は、感光ドラム１４０で画像転写中に定
着ローラ１０１の周速が搬送ベルト１０５の速度より速
くなって、転写材が定着ローラ１０１によって引張られ
ると、搬送ベルト１０５に対する吸着力は弱くなり、こ
の部分ですべりを生ずるため、感光ドラム１４０で転写
ばれる色に転写ずれが起こり、画像上の色すれとなって
、明らかな画像品位の低下となっていた。Further, in this device, when the circumferential speed of the fixing roller 101 becomes faster than the speed of the conveyor belt 105 during image transfer on the photosensitive drum 140 and the transfer material is pulled by the fixing roller 101, the adsorption force against the conveyor belt 105 becomes weak. As a result, slippage occurs in this portion, resulting in a transfer shift in the color transferred by the photosensitive drum 140, resulting in color blurring on the image, resulting in a clear deterioration in image quality.
（発明が解決しようとする問題点）
ところで、上記した従来例では、定着ローラ１０１の周
速が感光ドラム１０２の速度より連く、これらに転写材
が跨った場合に、転写材が定着ローラ１０１によって引
張られ、転写部１０４又は搬送ベルト１０５ですべりが
生じ、転写材上において転写ずれが起こり、画像品位の
低下となる。(Problems to be Solved by the Invention) In the conventional example described above, when the circumferential speed of the fixing roller 101 is higher than the speed of the photosensitive drum 102 and the transfer material straddles these, the transfer material crosses the fixing roller 101. This causes slippage in the transfer unit 104 or the conveyor belt 105, causing transfer misalignment on the transfer material, resulting in a decrease in image quality.
これを解決する手段として従来では、転写部１０４と定
着ローラ１０１との距離を使用する転写材の搬送方向長
さよりも長くするという方策がある。斯かる従来例では
、転写部１０４と定着ローラ１０１との距離を必要以上
に長くするため、装置全体の占めるデッドスペースの割
合を増加させることになり好ましくない。また、搬送方
向長さは、装置の幅方向となることが多く、この幅を広
くすることは、装置を大型化して装置の設置場所の自由
度を著しく減少させることになるという問題点があった
。A conventional method to solve this problem is to make the distance between the transfer unit 104 and the fixing roller 101 longer than the length of the transfer material used in the conveyance direction. In such a conventional example, the distance between the transfer section 104 and the fixing roller 101 is made longer than necessary, which is undesirable because it increases the percentage of dead space occupied by the entire apparatus. In addition, the length in the transport direction is often the width direction of the device, and increasing this width has the problem of increasing the size of the device and significantly reducing the degree of freedom in the installation location of the device. Ta.
まな、池の解決手段としては、本件出願人による特願昭
６０−１８６６７１号に開示されているものがある。こ
の従来例は、転写材の先端が定着ローラに侵入する際に
前記定着ローラを停止させ、前記転写材にループ（曲部
）を形成した後、前記定着ローラを回転させ、該定着ロ
ーラと像担持体又は定着ローラと搬送ベルトとの速度差
を吸収せしめるというものである。しかし、この従来例
では、前記定着ローラを停止するために、例えばクラッ
チが必要となり、このクラッチの機械的な立上がり、立
下がりの時間が紙間隔に影響を与えてしまい、連続に多
数枚の転写紙を搬送させるときの障害となっていた。ま
た、停止している前記定着ローラに転写紙が侵入すると
、その衝撃によって転写材上の未定着トナーが乱れ、画
像の品位を低下させ、その上、フルカラー画像の場合に
は、色すれとなってあられれてしまうという問題点があ
った。As a solution to the problem, there is one disclosed in Japanese Patent Application No. 186671/1988 filed by the applicant of the present invention. In this conventional example, when the leading edge of the transfer material enters the fixing roller, the fixing roller is stopped, a loop (curved portion) is formed in the transfer material, and then the fixing roller is rotated, and the fixing roller and the image This is to absorb the speed difference between the carrier or fixing roller and the conveyor belt. However, in this conventional example, a clutch, for example, is required to stop the fixing roller, and the mechanical rise and fall times of this clutch affect the paper spacing, resulting in continuous transfer of a large number of sheets. This was an obstacle when conveying paper. Furthermore, if the transfer paper enters the stationary fixing roller, the impact will disturb the unfixed toner on the transfer material, lowering the quality of the image, and furthermore, in the case of a full-color image, it may cause color smearing. There was a problem that it would get covered in hail.
そこで、本発明は従来例の上記した問題点を解決するた
めになされたもので、その目的とするところは、正確且
つ鮮明な画像が得られ、しかも連続通紙において正確な
紙間隔を保持しつつ、装置全体を小型化にすることにあ
る。Therefore, the present invention was made to solve the above-mentioned problems of the conventional example, and its purpose is to obtain accurate and clear images and maintain accurate paper spacing during continuous paper feeding. At the same time, the aim is to downsize the entire device.
（問題点を解決するための手段）
上記の目的を達成するために、本発明にあっては、未定
着のトナー像を保持した転写材を搬送する搬送手段と、
前記トナー像を一対のローラを用いて前記転写材上に定
着する定着手段と、前記ローラの周速を、前記搬送手段
が前記転写材を搬送する速度より遅い第１の周速と、こ
の第１の周速より速い第２の周速とに切換制御する速度
制御手段とを有し、前記転写材の先端が前記ロー５ＶＣ
達する時点では前記ローラの周速を前記第１の周速とし
、ヶれヵ、ら所定時間経過後、前記ローラノ周速を前記
第１の周速から前記第２の周速に切換よることによ、り
構成されている。(Means for Solving the Problems) In order to achieve the above object, the present invention includes a conveying means for conveying a transfer material holding an unfixed toner image;
a fixing means for fixing the toner image onto the transfer material using a pair of rollers; a first circumferential speed that is slower than a speed at which the conveyance means conveys the transfer material; a second circumferential speed faster than the first circumferential speed;
At the point when the roller reaches the first circumferential speed, the circumferential speed of the roller is set to the first circumferential speed, and after a predetermined period of time has elapsed, the circumferential speed of the roller is switched from the first circumferential speed to the second circumferential speed. It's very well structured.
（作 用）
本発明においては、定着手段のローラを速度制御手段に
よって、第１の周速と、この第１の周速より速い第２の
周速とに切換制御し、第１の周速を搬送手段が転写材を
搬送する速度より遅くし、前記第１の周速と前記第２の
周速を切換制御することで、前記転写材に曲部（ループ
）を形成させて、転写部におけるすべりを未然に防止す
るものである。(Function) In the present invention, the speed control means controls the roller of the fixing means to switch between a first circumferential speed and a second circumferential speed faster than the first circumferential speed. is slower than the speed at which the conveying means conveys the transfer material, and by controlling the switching between the first circumferential speed and the second circumferential speed, the transfer material forms a curved portion (loop), and the transfer portion This prevents slippage in advance.
（実施例）
以下に本発明を図示の実施例に基づいて説明する。第１
図は本発明を適用したフルカラー画像形成装置を示した
ものであり、像支持体としての転写材は、カセット６か
らピックアップローラ７を経てレジストローラ２１に送
られる。このレジストローラ２１によってタイミングを
測定された転写材は、搬送ベルト５に送られ、吸着帯電
器４１によって搬送ベルト５に静電吸着される。ここで
、吸着された転写材は像担持体としての感光ドラム２２
．２３．２４と帯電器３２．３３．３４によって構成さ
れる転写部４２，４３．４４を通過することにより、例
えばマゼンタ、シアン、イエローの順に未定着画像が転
写される。そして、未定着画像を保持した転写材は、一
対の定着ローラ１１に送られ、この定着ローラ１１を通
過して形成されたフルカラー画像出力は排紙ローラ８に
よってトレイ９上に排出される。１０は転写材の先端を
検出するための検出手段としてのセンサであり、例えば
光源とフォトトランソスタ、超音波センサ等が使用され
る。(Example) The present invention will be explained below based on the illustrated example. 1st
The figure shows a full-color image forming apparatus to which the present invention is applied, and a transfer material serving as an image support is sent from a cassette 6 to a registration roller 21 via a pickup roller 7. The transfer material whose timing has been measured by the registration rollers 21 is sent to the conveyor belt 5 and is electrostatically attracted to the conveyor belt 5 by the attraction charger 41 . Here, the adsorbed transfer material is transferred to a photosensitive drum 22 as an image carrier.
．． The unfixed images are transferred in the order of magenta, cyan, and yellow, for example, by passing through the transfer sections 42, 43.44, which are constituted by a charger 23.24 and a charger 32.33.34. Then, the transfer material holding the unfixed image is sent to a pair of fixing rollers 11, and the full-color image output formed by passing through the fixing rollers 11 is ejected onto a tray 9 by a paper ejection roller 8. Reference numeral 10 denotes a sensor as a detection means for detecting the leading edge of the transfer material, and for example, a light source, a phototransistor, an ultrasonic sensor, etc. are used.
上記の構成において、搬送ベルト５の搬送速度をＶｔ、
定着ローラ１１の第１の周速をｖｒｌ、定着ローラ１１
の第２の周速をＶｒ□とすると、ｖｒ、＜ｖｔ、Ｖｒ□
＞Ｖ、 と設定する。ここで、定着ローラ１１の第２
の周速ｖｒ□は定常状態における速度とする０搬送ベル
ト５によって搬送された転写材Ｓは、センサ１０により
その先端が検出される。In the above configuration, the conveying speed of the conveying belt 5 is Vt,
The first circumferential speed of the fixing roller 11 is vrl, and the fixing roller 11
If the second circumferential speed of is Vr□, then vr,<vt, Vr□
>V, set. Here, the second part of the fixing roller 11 is
The peripheral speed vr□ is the speed in a steady state.0 The leading edge of the transfer material S transported by the transport belt 5 is detected by the sensor 10.
この検出信号により、転写材Ｓの先端が定着ローラ１１
に到達する時点にて、定着ローラ１１の周速はＶｒｌに
切換制御されている。この場合、転写材Ｓの後端は転写
部４４１’！：おいて画像転写中である。そして、定着
ローラ１１と転写部４４との間に存在する転写材Ｓは、
第２図に示すように曲部（ループ）ｂが形成される。こ
の時、曲部すが大きくなり過ぎると、装置本体内の一部
に未定着画像が接触することＫなり、また転写材Ｓの曲
率の増加により、未定着画像が乱れてしまい、正確な画
像が得られなくなる。そこで、所定の曲部すの変形量が
得られる時間が経過した後は、前記第１の周速ｖｒ＋よ
りも速い周速で定着ローラ１１を駆動する必要がある。This detection signal causes the leading edge of the transfer material S to move toward the fixing roller 11.
At the time when Vrl is reached, the circumferential speed of the fixing roller 11 is controlled to be switched to Vrl. In this case, the rear end of the transfer material S is the transfer portion 441'! : Image transfer is in progress. The transfer material S existing between the fixing roller 11 and the transfer section 44 is
As shown in FIG. 2, a curved portion (loop) b is formed. At this time, if the curved portion becomes too large, the unfixed image may come into contact with a part of the inside of the apparatus body, and the increased curvature of the transfer material S may disturb the unfixed image, making it difficult to obtain accurate images. will not be obtained. Therefore, after the time period for which a predetermined amount of deformation of the curved portion is obtained has elapsed, it is necessary to drive the fixing roller 11 at a peripheral speed faster than the first peripheral speed vr+.
このため、予め設定した一定時間を経過後、定着ローラ
１１の周速を第２の周速ｖｒ２に復帰させ、第２図に示
す転写材Ｓの曲部すの変形量を制御する。したがって、
第２の周速ｖｒ２の値を可変することで、曲部すの変形
量が所定量に保持されたり、減少したりすることになる
。Therefore, after a preset certain period of time has elapsed, the circumferential speed of the fixing roller 11 is returned to the second circumferential speed vr2, and the amount of deformation of the curved portion of the transfer material S shown in FIG. 2 is controlled. therefore,
By varying the value of the second circumferential speed vr2, the amount of deformation of the curved portion can be maintained at a predetermined amount or reduced.
ここで、本実施例の制御系を第３図に基づいて説明する
に、センサ１０が転写材Ｓの先端を検出すると、この検
出信号を速度制御手段６０で受け、これにより定着ロー
ラ１１に連結した駆動手段７０を制御し、定着ローラ１
１の周速を第２の周速ｖ、２から第１の周速に切換える
。更に、タイマ５０により一定時間経過後、速度制御手
段６０に信号を送出し、再び第２の周速ｖｒ□に戻るよ
うにしである。Here, the control system of this embodiment will be explained based on FIG. The fixing roller 1
The circumferential speed of 1 is changed to the second circumferential speed v, and the circumferential speed of 2 is switched to the first circumferential speed. Further, after a certain period of time has elapsed by the timer 50, a signal is sent to the speed control means 60 to return to the second circumferential speed vr□ again.
次に、上記のような転写材Ｓの曲部すの形成経過におけ
る動作を第４図の７０−チャートに基づいて説明する。Next, the operation in the process of forming the curved portion of the transfer material S as described above will be explained based on chart 70 in FIG. 4.
先ずステップので画像形成信号を送出すると、定着ロー
ラ１１が第２の周速ｖｒ□で回転（ステップ■）シ、次
いで、ステップ■、ステップ■、ステップ■によって、
感光ドラム２２゜２３．２４と帯電器３２，３３．３４
により構成される転写部４２．４３．４４を通過するこ
とで、マゼンタ、シアン、イエローの順に未定着画像カ
転写され、そしてステップ■でセンサ１０が転写材Ｓの
先端を検知すると、定着ローラ１１の周速が第１の周速
ｖｒ１に切換わる（ステップ■）。この際、センサ１０
が転写材Ｓの先端を検知しない場合、再び検知し直す。First, when the image forming signal is sent in step, the fixing roller 11 rotates at the second circumferential speed vr□ (step ■), then in step ■, step ■, step ■,
Photosensitive drum 22゜23.24 and charger 32, 33.34
The unfixed image is transferred in the order of magenta, cyan, and yellow by passing through the transfer sections 42, 43, and 44 configured by The circumferential speed is switched to the first circumferential speed vr1 (step ■). At this time, sensor 10
If it does not detect the leading edge of the transfer material S, it detects it again.
更に、ステップ■で一定時間ｔが経過したか否か判断し
、経過した場合、再度第２の周速Ｖｒ２に復帰する。こ
の場合、一定時間ｔを経過しないときは、ステップ■に
戻る。Further, in step (2), it is determined whether or not a certain time t has elapsed, and if it has elapsed, the second circumferential speed Vr2 is returned again. In this case, if the predetermined time t has not elapsed, the process returns to step (2).
そして、ステップ［株］で設定枚数の画像形成が終了す
ると、ステップ■で装置を停止する。一方、ステップ０
で設定枚数の画像形成が終了しないと、ステップ■に戻
すことにより行なわれる。Then, when the formation of the set number of images is completed in step [stock], the apparatus is stopped in step (2). On the other hand, step 0
If the set number of images is not completed, the process returns to step (2).
尚、上記実施例では、定常状態における定着ローラ１１
の周速を第２の周速ｖｒ□としたが、これを第１の周速
Ｖｒ１とし、転写材Ｓが定着ローラ１１に侵入して、一
定時間経過後に第２の周速ｖｒ２にし、更に一定時間経
過後、第１の周速ｖｒ□に戻すという制御でもよい。Note that in the above embodiment, the fixing roller 11 in the steady state
The peripheral speed of is set as the second peripheral speed vr□, but this is set as the first peripheral speed Vr1, the transfer material S enters the fixing roller 11, and after a certain period of time has passed, the peripheral speed is set to the second peripheral speed vr2, and then The control may be such that the circumferential speed is returned to the first circumferential speed vr□ after a certain period of time has elapsed.
而して、上記のように速度制御手段によって定着ローラ
の周速を第１の周速と第２の周速とに切換制御すること
により、第１図及び第２図に示す転写部４４に存在する
転写材を定着ローラ１１で引張ることがなくなるので、
フルカラー画像形成装置では、画像の色すれか、また単
色画像形成装置では画像の伸びがなくなり、正確な画像
出力を得ることができる。また、曲部の変形量を一定に
保持することにより、転写材の挙動変化も少なくて済み
、画像も乱れない。更に、定着ローラの回転を停止する
ことがないので、クラッチ等の駆動断続機構を使用する
ことなく、立上り、立下りの問題が解消され、連続通紙
における正確な紙間隔が確保される。そして、定着ロー
ラに転写材が侵入する際のｆｉ撃も小さいので、転写材
上の画像の乱れもない。また、転写部と定着ローラとの
距離は、曲部が形成される距離だけの長さを設ければよ
く、装置の小型化が可能となる。By controlling the circumferential speed of the fixing roller to be switched between the first circumferential speed and the second circumferential speed by the speed control means as described above, the transfer unit 44 shown in FIGS. Since the existing transfer material is not pulled by the fixing roller 11,
In a full-color image forming apparatus, there is no blurring of the image, and in a monochrome image forming apparatus, there is no stretching of the image, and accurate image output can be obtained. Furthermore, by keeping the amount of deformation of the curved portion constant, changes in the behavior of the transfer material can be reduced and the image will not be disturbed. Furthermore, since the rotation of the fixing roller is not stopped, problems with rising and falling edges are resolved without using a drive intermittent mechanism such as a clutch, and accurate paper spacing is ensured during continuous paper feeding. Furthermore, since the impact when the transfer material enters the fixing roller is small, there is no disturbance of the image on the transfer material. Further, the distance between the transfer section and the fixing roller may be set to a length corresponding to the distance where the curved section is formed, and the apparatus can be made smaller.
尚、本発明における定着方式としては、熱及び圧力によ
る加熱定着方式、圧力のみによる圧力定着方式のいずれ
も採用することができる。As the fixing method in the present invention, either a heat fixing method using heat and pressure or a pressure fixing method using only pressure can be adopted.
（発明の効果）
本発明に係る画像形成装置は以上の構成及び作用からな
るもので、定着手段におけるローラの周速を第１の周速
と、この第１の周速より速“第２の周速とに速度制御手
段によって切換制御し、前記第１の周速は搬送手段が転
写材を搬送する速度より遅く設定して、転写材が前記ロ
ーラによって搬送されている間に転写材に曲部を形成す
るようにしたから、高精度に制御可能で、正確且つ鮮明
な画像が得られ、しかも連続通紙において正確な紙間隔
を保持しつつ、装置全体の小型化を図ることができると
いう効果を奏する。(Effects of the Invention) The image forming apparatus according to the present invention has the above-described configuration and operation, and sets the circumferential speed of the roller in the fixing means to a first circumferential speed, and a second circumferential speed faster than the first circumferential speed. The first circumferential speed is set to be slower than the speed at which the conveyance means conveys the transfer material, and the first circumferential speed is set to be slower than the speed at which the conveyance means conveys the transfer material, so that the transfer material is not curved while the transfer material is being conveyed by the roller. This allows for high-precision control, accurate and clear images, and allows for the miniaturization of the entire device while maintaining accurate paper spacing during continuous sheet feeding. be effective.
第１図は本発明をａ泪したフルカラー画像形成装置を示
す概略図、第２図は本発明に係る画像形成装置の一実施
例の要部を示す概略図、第３図は同実施例における制御
系を示すブロック図、第４図は同実施例の速度制御のフ
ローチャート、第５図は従来の画像形成装置を示す概略
図、第６図は画像形成装置の他の従来例を示す概略図で
ある。
符号の説明
５・・・搬送ベルト、 １０・・・センサ。
１１・・・定着ローラ、 ５０・・・タイマ。
６０・・・速度制御手段、 ７０・・・駆動手段。
Ｓ・・・転写材、 ｂ・・・曲部。FIG. 1 is a schematic diagram showing a full-color image forming apparatus embodying the present invention, FIG. 2 is a schematic diagram showing essential parts of an embodiment of the image forming apparatus according to the present invention, and FIG. A block diagram showing the control system, FIG. 4 is a flowchart of speed control in the same embodiment, FIG. 5 is a schematic diagram showing a conventional image forming apparatus, and FIG. 6 is a schematic diagram showing another conventional example of the image forming apparatus. It is. Explanation of symbols 5...Transport belt, 10...Sensor. 11... Fixing roller, 50... Timer. 60... Speed control means, 70... Drive means. S... Transfer material, b... Curved section.
Claims (1)
と、前記トナー像を一対のローラを用いて前記転写材上
に定着する定着手段と、前記ローラの周速を、前記搬送
手段が前記転写材を搬送する速度より遅い第１の周速と
、この第１の周速より速い第２の周速とに切換制御する
速度制御手段とを有し、前記転写材の先端が前記ローラ
に達する時点では前記ローラの周速を前記第１の周速と
し、それから所定時間経過後、前記ローラの周速を前記
第１の周速から前記第２の周速に切換えることを特徴と
する画像形成装置。a conveyance means for conveying a transfer material holding an unfixed toner image; a fixing means for fixing the toner image onto the transfer material using a pair of rollers; a speed control means for controlling switching between a first circumferential speed slower than the speed at which the transfer material is conveyed and a second circumferential speed faster than the first circumferential speed; An image characterized in that the circumferential speed of the roller is set to the first circumferential speed at the time when the circumferential speed of the roller is reached, and after a predetermined period of time has passed, the circumferential speed of the roller is switched from the first circumferential speed to the second circumferential speed. Forming device.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61003186A JPS62161157A (en) | 1986-01-10 | 1986-01-10 | Image forming device |
| US07/318,464 US4941021A (en) | 1986-01-10 | 1989-02-28 | Image forming apparatus with recording material loop forming and control means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61003186A JPS62161157A (en) | 1986-01-10 | 1986-01-10 | Image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62161157A true JPS62161157A (en) | 1987-07-17 |
Family
ID=11550369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61003186A Pending JPS62161157A (en) | 1986-01-10 | 1986-01-10 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62161157A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02280173A (en) * | 1989-04-21 | 1990-11-16 | Ricoh Co Ltd | Image forming device |
| JPH0379549A (en) * | 1989-08-21 | 1991-04-04 | Ricoh Co Ltd | Recording medium discharging device |
| DE4039158A1 (en) * | 1989-12-07 | 1991-06-13 | Hitachi Ltd | ELECTROSTATIC COPIER |
| JPH03196077A (en) * | 1989-12-25 | 1991-08-27 | Sharp Corp | Fixing device |
| DE4324148A1 (en) * | 1992-07-17 | 1994-01-20 | Hitachi Ltd | Belt transmission unit for electrophotographic copier or printer - has system of rollers for driving endless belt made of flexible material with high electrical resistance |
| JP2006309189A (en) * | 2005-03-30 | 2006-11-09 | Canon Inc | Image forming apparatus |
| JP2009173367A (en) * | 2008-01-22 | 2009-08-06 | Riso Kagaku Corp | Printer |
| JP2010072489A (en) * | 2008-09-19 | 2010-04-02 | Fuji Xerox Co Ltd | Image forming apparatus |
| JP2011081164A (en) * | 2009-10-07 | 2011-04-21 | Oki Data Corp | Image forming apparatus |
| JP2012168557A (en) * | 2012-05-09 | 2012-09-06 | Oki Data Corp | Image forming device |
| JP2014044381A (en) * | 2012-08-29 | 2014-03-13 | Brother Ind Ltd | Image forming apparatus |
| JP2015055678A (en) * | 2013-09-10 | 2015-03-23 | 東芝テック株式会社 | Fixing apparatus and image forming apparatus |
-
1986
- 1986-01-10 JP JP61003186A patent/JPS62161157A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02280173A (en) * | 1989-04-21 | 1990-11-16 | Ricoh Co Ltd | Image forming device |
| JPH0379549A (en) * | 1989-08-21 | 1991-04-04 | Ricoh Co Ltd | Recording medium discharging device |
| DE4039158A1 (en) * | 1989-12-07 | 1991-06-13 | Hitachi Ltd | ELECTROSTATIC COPIER |
| US5130753A (en) * | 1989-12-07 | 1992-07-14 | Hitachi Ltd. | Electrophotographic copying apparatus |
| JPH03196077A (en) * | 1989-12-25 | 1991-08-27 | Sharp Corp | Fixing device |
| US5499086A (en) * | 1992-07-17 | 1996-03-12 | Hitachi, Ltd. | Belt type transfer device for electrophotographic apparatus |
| DE4324148A1 (en) * | 1992-07-17 | 1994-01-20 | Hitachi Ltd | Belt transmission unit for electrophotographic copier or printer - has system of rollers for driving endless belt made of flexible material with high electrical resistance |
| JP2006309189A (en) * | 2005-03-30 | 2006-11-09 | Canon Inc | Image forming apparatus |
| JP2009173367A (en) * | 2008-01-22 | 2009-08-06 | Riso Kagaku Corp | Printer |
| JP2010072489A (en) * | 2008-09-19 | 2010-04-02 | Fuji Xerox Co Ltd | Image forming apparatus |
| JP2011081164A (en) * | 2009-10-07 | 2011-04-21 | Oki Data Corp | Image forming apparatus |
| JP2012168557A (en) * | 2012-05-09 | 2012-09-06 | Oki Data Corp | Image forming device |
| JP2014044381A (en) * | 2012-08-29 | 2014-03-13 | Brother Ind Ltd | Image forming apparatus |
| JP2015055678A (en) * | 2013-09-10 | 2015-03-23 | 東芝テック株式会社 | Fixing apparatus and image forming apparatus |
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