JPH07160136A - Thermal fixing device and temperature controlling method - Google Patents
Thermal fixing device and temperature controlling methodInfo
- Publication number
- JPH07160136A JPH07160136A JP30162993A JP30162993A JPH07160136A JP H07160136 A JPH07160136 A JP H07160136A JP 30162993 A JP30162993 A JP 30162993A JP 30162993 A JP30162993 A JP 30162993A JP H07160136 A JPH07160136 A JP H07160136A
- Authority
- JP
- Japan
- Prior art keywords
- heating
- roller
- temperature
- heating element
- 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.)
- Pending
Links
Landscapes
- Control Of Temperature (AREA)
- Fixing For Electrophotography (AREA)
- Control Of Resistance Heating (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は電子写真式プリンタ、複
写機、ファクシミリ等に使用される加熱定着装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat fixing device used in electrophotographic printers, copying machines, facsimiles and the like.
【０００２】[0002]
【従来の技術】従来、電子写真式プリンタ、複写機、フ
ァクシミリ等には、トナ−を転写した用紙の搬送路を挟
んで、発熱体を内在した加熱ロ−ラに回転自在な圧接ロ
−ラを圧接し、発熱体により定着可能な設定温度に加熱
した加熱ロ−ラを回転しながら用紙を圧接し、トナ−を
用紙に融着させる加熱定着装置が使用されている。2. Description of the Related Art Conventionally, in an electrophotographic printer, a copying machine, a facsimile, etc., a pressure roller which is rotatable relative to a heating roller having a heating element therein with a conveying path for a sheet on which a toner is transferred being sandwiched. A heating and fixing device is used in which a sheet of paper is pressed against a sheet of paper while the sheet of paper is pressed against the sheet of paper while rotating a heating roller heated to a preset temperature at which fixing can be performed by a heating element.
【０００３】図２は従来例を示す概略構成図である。加
熱定着装置１には、トナ−２ａを転写した用紙２の用紙
搬送路を挟んで加熱ロ−ラ３と圧接ロ−ラ４とが配設し
てある。加熱ロ−ラ３はアルミニュウム製のロ−ラ基材
３ａの内部に発熱体としてハロゲンランプ５を有してい
る。加熱ロ−ラ３はロ−ラ表面をトナ−定着可能な温度
範囲に、且つ均一に維持する必要があり、特に連続印刷
時の急激な熱の放出に対応して維持する必要があるの
で、大量の熱を保持するようにロ−ラ基材３ａの肉厚を
２〜３ｍｍにし、熱容量を大きくしている。圧接ロ−ラ
４はロ−ラ基材６の表面にシリコンゴム等を離形性弾性
層として有し、図示せぬコイルスプリングにより加熱ロ
−ラ３側に付勢された軸受に支持してある。軸受は図示
せぬ本体装置のサイドフレ−ムに摺動自在に支持してあ
る。加熱ロ−ラ３の表面には表面温度を検出するサ−ミ
スタ等の温度検出手段７が配設してある。通電制御部８
は温度検出手段７を介して加熱ロ−ラ３の表面温度が定
着可能な設定温度に追従するようにハロゲンランプ５に
通電する。FIG. 2 is a schematic configuration diagram showing a conventional example. The heating and fixing device 1 is provided with a heating roller 3 and a pressure contact roller 4 with a sheet conveying path for the sheet 2 onto which the toner-2a is transferred being sandwiched. The heating roller 3 has a halogen lamp 5 as a heating element inside a roller base material 3a made of aluminum. The heating roller 3 needs to maintain the temperature of the roller surface in a temperature range in which the toner can be fixed by toner, and to maintain the temperature uniformly, and in particular, to maintain a rapid heat release during continuous printing. The roller base material 3a is made to have a wall thickness of 2 to 3 mm so as to retain a large amount of heat, thereby increasing the heat capacity. The pressure contact roller 4 has silicon rubber or the like as a releasable elastic layer on the surface of the roller base material 6, and is supported by a bearing urged toward the heating roller 3 by a coil spring (not shown). is there. The bearing is slidably supported on a side frame of a main body device (not shown). Temperature detecting means 7 such as a thermistor for detecting the surface temperature is provided on the surface of the heating roller 3. Energization control unit 8
The halogen lamp 5 is energized via the temperature detecting means 7 so that the surface temperature of the heating roller 3 follows the set temperature at which fixing is possible.
【０００４】図３は従来例のタイムチャ−トである。FIG. 3 shows a conventional time chart.
【０００５】時刻ｔ0 で電源を入れる。通電制御部８は
ハロゲンランプ５に通電し、ハロゲンランプ５を連続点
灯して加熱する。通電制御部８は温度検出手段７を介し
て加熱ロ−ラ３の表面温度を検知している。At time t0, the power is turned on. The energization controller 8 energizes the halogen lamp 5 to continuously light the halogen lamp 5 to heat it. The energization control unit 8 detects the surface temperature of the heating roller 3 via the temperature detecting means 7.
【０００６】時刻ｔ1 で通電制御部８は加熱ロ−ラ３の
表面温度が定着可能な設定温度Ｔに達したことを検知
し、以後設定温度Ｔを基準に温度管理する。即ち、設定
温度Ｔを基準にオ−バ−シュ−トさせながら追従する。
この状態で定着動作が開始されると、加熱ロ−ラ３、圧
接４ロ−ラは図示せぬ駆動手段によりそれぞれ矢印Ａ方
向、Ｂ方向に回転する。そして、用紙搬送路に沿って矢
印Ｃ方向に搬送される用紙２を加熱圧接し、トナ−２ａ
を用紙２に融着する。At time t1, the energization control unit 8 detects that the surface temperature of the heating roller 3 has reached the set temperature T at which fixing is possible, and thereafter controls the temperature based on the set temperature T. That is, the set temperature T is used as the reference while following the overshoot.
When the fixing operation is started in this state, the heating roller 3 and the pressure contact 4 roller are rotated in the directions of arrows A and B, respectively, by the driving means (not shown). Then, the sheet 2 conveyed in the direction of the arrow C along the sheet conveying path is heated and pressure-contacted to the toner-2a.
Is fused to paper 2.
【０００７】[0007]
【発明が解決しようとする課題】従来の加熱定着装置に
あっては、加熱ロ−ラのロ−ラ基材に肉厚２〜３ｍｍの
アルミニュウム製ロ−ラを用いているので、熱容量が大
きくなり、電源を入れてから設定温度に達するまでに長
い待ち時間を要するという問題点があった。In the conventional heat fixing device, since the roller made of aluminum having a thickness of 2 to 3 mm is used as the roller base material of the heating roller, the heat capacity is large. Therefore, there is a problem that a long waiting time is required until the set temperature is reached after the power is turned on.
【０００８】又、熱容量が大きいことに加えて、ロ−ラ
基材の肉厚が厚いことから熱伝導に遅れを生じ、設定温
度に対するオ−バ−シュ−ト温度範囲が広くなって細密
な温度制御を妨げるという問題点もあった。Further, in addition to having a large heat capacity, the thick wall of the roller base material causes a delay in heat conduction, and the overshoot temperature range with respect to the set temperature is widened to be fine. There was also the problem of obstructing temperature control.
【０００９】本発明は、電源を入れてから設定温度に達
するまでの待ち時間を短くするとともに設定温度に対し
て追従性に優れた加熱定着装置と温度制御方法とを提供
することを目的としている。It is an object of the present invention to provide a heating and fixing device and a temperature control method which shorten the waiting time from turning on the power to reach the set temperature and have excellent followability to the set temperature. .
【００１０】[0010]
【課題を解決するための手段】上記目的を達成するため
に本発明の加熱定着装置においては、加熱ロ−ラは熱容
量の小さい薄肉パイプで構成し、発熱体は加熱ロ−ラを
発熱させる外部発熱体と、加熱ロ−ラ内部に加熱ロ−ラ
を加熱する内部発熱体とを備えたものである。又、設定
温度を低温オフセットを発生せず且つトナ−定着可能な
第１の設定温度と高温オフセットを発生せず且つトナ−
定着可能な第２の設定温度とに設定し、加熱ロ−ラの表
面温度が第１の設定温度に達するまでは外部発熱体と内
部発熱体とを発熱し、表面温度が第１の設定温度に達し
た後は外部発熱体への給電を停止して内部発熱体への間
欠給電により表面温度を第２の設定温度に維持するよう
に制御したものである。In order to achieve the above object, in the heat fixing device of the present invention, the heating roller is composed of a thin pipe having a small heat capacity, and the heating element causes the heating roller to generate heat. A heating element and an internal heating element for heating the heating roller are provided inside the heating roller. Further, the set temperature is the first set temperature at which the toner fixing is possible without causing the low temperature offset and the high temperature offset is not generated, and the toner is not generated.
The second set temperature at which fixing is possible is set, and the external heating element and the internal heating element generate heat until the surface temperature of the heating roller reaches the first set temperature, and the surface temperature is the first set temperature. After reaching, the power supply to the external heating element is stopped and the surface temperature is controlled to be maintained at the second set temperature by intermittent power supply to the internal heating element.
【００１１】[0011]
【作用】上記のように構成された加熱定着装置の加熱ロ
−ラは、熱容量の小さい薄肉パイプであり、外部発熱体
が加熱ロ−ラを直接的に加熱し、加熱ロ−ラ内部に設け
られた内部発熱体が加熱ロ−ラを内部から間接的に加熱
するので電源を入れてから短時間で設定温度に達する。The heating roller of the heating and fixing device constructed as described above is a thin-walled pipe having a small heat capacity, and the external heating element directly heats the heating roller and is provided inside the heating roller. Since the internal heating element thus indirectly heats the heating roller from the inside, the set temperature is reached in a short time after the power is turned on.
【００１２】さらに加熱ロ−ラが熱容量の小さい薄肉パ
イプであることから熱がロ−ラ表面に伝導しやすく、加
熱ロ−ラの表面温度が第１の設定温度に達するまでは外
部発熱体と内部発熱体とを発熱し、表面温度が第１の設
定温度に達した後は、小さい熱容量を利用して外部発熱
体への給電を停止し、内部発熱体への給電を間欠給電に
切り替えて表面温度を第２の設定温度に維持する細密な
温度制御を行う。Further, since the heating roller is a thin-walled pipe having a small heat capacity, heat is easily transferred to the surface of the roller, and an external heating element is used until the surface temperature of the heating roller reaches the first set temperature. After the internal heating element heats up and the surface temperature reaches the first set temperature, the power supply to the external heating element is stopped by using the small heat capacity, and the power supply to the internal heating element is switched to intermittent power feeding. Fine temperature control is performed to maintain the surface temperature at the second set temperature.
【００１３】従って、電源を入れてから定着温度に達す
るまでの待ち時間を短くするとともに設定温度に対して
追従性に優れた加熱定着装置と温度制御方法とを提供し
得るのである。Therefore, it is possible to provide a heating and fixing device and a temperature control method which can shorten the waiting time from when the power is turned on until the fixing temperature is reached and which is excellent in following up with the set temperature.
【００１４】[0014]
【実施例】本発明の実施例について図面を参照しながら
説明する。尚、各図面に共通な要素には同一符号を付
す。Embodiments of the present invention will be described with reference to the drawings. Elements common to the drawings are given the same reference numerals.
【００１５】第１実施例 図４は第１実施例を示す電子写真式プリンタの概略模式
図である。電子写真式プリンタは用紙搬送路１１の一端
部に用紙給紙部１２を有し、他端部に用紙排出部１３を
有する。用紙給紙部１２には用紙カセット１２ａに収納
した用紙２を繰り出す繰出しロ−ラ１２ｂが設けてあ
り、用紙排出部１３には一対の圧接された排出ロ−ラ１
３ａ、１３ｂが設けてある。用紙搬送路１１には用紙給
紙部１２側からレジストロ−ラ１４、画像形成部１５、
加熱定着装置１６が配設してある。用紙給紙部１２は繰
出しロ−ラ１２ｂが用紙カセット１２ａから用紙２を一
枚ずつ分離して繰り出す。レジストロ−ラ１４は、一
旦、繰り出された用紙２の先端部を停止させ、スキュ−
を修正した後、回転して用紙２を画像形成部１５に搬送
する。 First Embodiment FIG. 4 is a schematic diagram of an electrophotographic printer showing a first embodiment. The electrophotographic printer has a paper feed unit 12 at one end of the paper transport path 11 and a paper discharge unit 13 at the other end. The paper feeding section 12 is provided with a feeding roller 12b for feeding the paper 2 stored in the paper cassette 12a, and the paper discharging section 13 is provided with a pair of pressure rollers 1 which are pressed against each other.
3a and 13b are provided. From the side of the sheet feeding unit 12 to the sheet conveying path 11, the registration roller 14, the image forming unit 15,
A heat fixing device 16 is provided. In the paper feeding unit 12, the feeding roller 12b separates and feeds the paper 2 one by one from the paper cassette 12a. The registration roller 14 temporarily stops the leading end portion of the fed-out paper 2 and scans it.
Then, the sheet 2 is rotated to convey the sheet 2 to the image forming unit 15.
【００１６】画像形成部１５は用紙搬送路１１を挟んで
感光体ドラム１７とトナ−転写装置１８が設けてある。
感光体ドラム１７は図示せぬサイドフレ−ムに軸支して
あり、図示せぬ駆動手段により所定の回転速度で回転す
る。感光体ドラム１７の周囲には帯電器１９、光源２
０、現像器２１、分離帯電器２２、クリ−ナ２３等が設
けてある。The image forming section 15 is provided with a photoconductor drum 17 and a toner transfer device 18 with the sheet conveying path 11 interposed therebetween.
The photosensitive drum 17 is rotatably supported by a side frame (not shown) and rotated at a predetermined rotation speed by a driving means (not shown). A charger 19 and a light source 2 are provided around the photosensitive drum 17.
0, a developing device 21, a separation charging device 22, a cleaner 23 and the like are provided.
【００１７】感光体ドラム１７の表面は分離帯電器２
２、クリ−ナ２３で帯電のない状態にされた後、帯電器
１９で一様にマイナスに帯電させられる。一様にマイナ
スに帯電させられた感光体ドラム１７の表面には印刷デ
−タに基づいて光源２０が露光し、露光した部分を導電
化して、ほぼ０Ｖ状態の静電潜像を形成する。現像器２
１はマイナスに帯電したトナ−を静電潜像に付着させて
現像化する。The surface of the photosensitive drum 17 is a separation charger 2.
2. After being made uncharged by the cleaner 23, it is uniformly negatively charged by the charger 19. The surface of the photosensitive drum 17, which is uniformly negatively charged, is exposed by the light source 20 based on the print data, and the exposed portion is made conductive to form an electrostatic latent image in a state of approximately 0V. Developer 2
In No. 1, a toner charged negatively is attached to the electrostatic latent image for development.
【００１８】トナ−転写装置１８は用紙搬送路１１上の
用紙２の裏側からコロナ放電によりプラスの電荷を与
え、静電引力により感光体ドラム１７から用紙２の表側
にトナ−を転写させる。加熱定着装置１６はトナ−を付
着した用紙２を加熱圧着してトナ−を用紙２に融着す
る。The toner transfer device 18 applies a positive charge from the back side of the paper 2 on the paper transport path 11 by corona discharge, and transfers the toner from the photosensitive drum 17 to the front side of the paper 2 by electrostatic attraction. The heat fixing device 16 heats and presses the sheet 2 to which the toner is attached to fuse the toner to the sheet 2.
【００１９】図１は第１実施例の加熱定着装置の概略構
成図であり、図５は加熱ロ−ラの拡大部分断面図であ
る。従来技術と異なるところは加熱ロ−ラの構造と発熱
体である。即ち、加熱ロ−ラは熱容量の小さい薄肉パイ
プで構成し、発熱体は加熱ロ−ラを発熱させる外部発熱
体と、加熱ロ−ラ内部に加熱ロ−ラを加熱する内部発熱
体とを備えた点である。FIG. 1 is a schematic configuration diagram of a heat fixing device of the first embodiment, and FIG. 5 is an enlarged partial sectional view of a heating roller. The difference from the prior art is the structure of the heating roller and the heating element. That is, the heating roller is composed of a thin pipe having a small heat capacity, and the heating element is provided with an external heating element for heating the heating roller and an internal heating element for heating the heating roller inside the heating roller. It is a point.
【００２０】加熱ロ−ラ３０は繊維強化複合材料を均一
な密度で配設し、耐熱性樹脂をバインダとして含浸させ
た薄肉パイプ状繊維強化複合材集合体とし、離形性を有
するコ−ト層を外層に施したものである。例えば図５
（Ａ）に示すように加熱ロ−ラ３０と同じ長さを有する
単繊維カ−ボンファイバ３１を均一な密度で多数並べ、
耐熱性樹脂をバインダ３２として５〜５０ｗｔ％（重量
％）含浸させた外径２０ｍｍ、肉厚０．１〜０．８ｍｍ
程度の薄肉パイプ状カ−ボンファイバ集合体である。表
面には離形性に優れ、トナ−オフセットを防止する弗素
系樹脂等のコ−ト層３３が設けてある。単繊維カ−ボン
ファイバ３１は導電性を有するとともに電気抵抗体であ
るので外部発熱体として用いる。The heating roller 30 is a thin-walled pipe-shaped fiber-reinforced composite material aggregate in which the fiber-reinforced composite material is arranged at a uniform density and is impregnated with a heat-resistant resin as a binder. The layers are applied to the outer layers. For example, in FIG.
As shown in (A), a large number of single fiber carbon fibers 31 having the same length as the heating roller 30 are arranged at a uniform density.
An outer diameter of 20 mm and a wall thickness of 0.1 to 0.8 mm impregnated with a heat-resistant resin as a binder 32 in an amount of 5 to 50 wt% (weight%).
It is a thin-walled pipe-shaped carbon fiber aggregate. On the surface, a coat layer 33 made of a fluorine-based resin or the like which is excellent in releasability and prevents toner offset is provided. Since the single fiber carbon fiber 31 has conductivity and an electric resistance, it is used as an external heating element.
【００２１】単繊維カ−ボンファイバ３１は市販されて
いる直径５〜１０μｍが適している。単繊維カ−ボンフ
ァイバ３１はロ−ラ軸方向だけでなく、図５（Ｂ）に示
すように、軸方向に対して直角方向に重ねて配置しても
よいし、図５（Ｃ）に示すように軸方向と軸方向に対し
て直角方向とにファイバを織りあげてもよい。織りあげ
る場合にはカ−ボンファイバに代えてグラスファイバを
使用してもよい。A commercially available single fiber carbon fiber 31 having a diameter of 5 to 10 μm is suitable. The single fiber carbon fiber 31 may be arranged not only in the roller axial direction but also in a direction perpendicular to the axial direction as shown in FIG. 5 (B), or as shown in FIG. 5 (C). The fibers may be woven in the axial direction and in a direction perpendicular to the axial direction as shown. When weaving, glass fiber may be used instead of carbon fiber.
【００２２】又、バインダ３２にはポリイミド、ポリフ
ェニレンサルファイド等も適しているが、これ等に限定
されるものではない。Polyimide, polyphenylene sulfide and the like are also suitable for the binder 32, but the binder 32 is not limited to these.
【００２３】このように構成された加熱ロ−ラ３０は比
強度（強度／比重）で鋼の約３倍、比弾性で鋼の約３〜
４倍あり、アルミニュウム製に比べて高い曲げ剛性が得
られ、厚さをアルミニュウム製に対して１／１０〜１／
３にすることができる。The heating roller 30 thus constructed has a specific strength (strength / specific gravity) about 3 times that of steel and a specific elasticity of about 3 to 3 times that of steel.
4 times as much, and high flexural rigidity is obtained compared to aluminum products, and the thickness is 1/10 to 1/1 compared to aluminum products.
It can be set to 3.
【００２４】又、カ−ボンファイバの熱伝導率は軟鋼と
同等レベルなので、軸方向の温度勾配を均一化し易い。
このことから加熱ロ−ラとしての熱容量が小さくなる。Further, since the thermal conductivity of the carbon fiber is at the same level as that of mild steel, it is easy to make the temperature gradient in the axial direction uniform.
This reduces the heat capacity of the heating roller.
【００２５】従って、暖まりやすいので電源を入れてか
ら定着温度に達するまでの待ち時間を短くすることがで
きる。Therefore, since it is easy to warm up, it is possible to shorten the waiting time from when the power is turned on until the fixing temperature is reached.
【００２６】又、熱容量が小さくなったことに加えて肉
厚が薄くなったことにより、熱がロ−ラ表面に伝導しや
すいので、設定温度に対して追従性に優れた温度制御が
可能となる。Further, since the heat capacity is reduced and the wall thickness is thinned, heat is easily transferred to the roller surface, so that it is possible to perform temperature control having excellent followability with respect to the set temperature. Become.
【００２７】パイプ状の加熱ロ−ラ３０の一端には、図
６に示すように、導電性メッキを施した受電側電極３４
を介して歯車３５が設けてあり、他端には受電側電極３
６が設けてある。加熱ロ−ラ３０の両端部は軸受３７、
３８を介して装置フレ−ム３９に支持されてあり、歯車
３５に噛み合った図示せぬ駆動側歯車によって回転す
る。At one end of the pipe-shaped heating roller 30, as shown in FIG. 6, the power receiving side electrode 34 is plated with conductive material.
A gear 35 is provided through the power receiving side electrode 3 at the other end.
6 is provided. Both ends of the heating roller 30 are bearings 37,
It is supported by the device frame 39 via 38 and is rotated by a drive side gear (not shown) meshed with the gear 35.
【００２８】受電側電極３４、３６に対向する位置にそ
れぞれ、図１に示すように、給電側電極４１を有する付
勢部材としての板バネ４２が装置フレ−ム３９に片持ち
状に支持してある。板バネ４２にはリンク４３を介して
給電側電極４１を受電側電極３４に圧接させるアクチュ
エ−タとしての電磁ソレノイド４４が設けてある。電磁
ソレノイド４４は励磁すると、給電側電極４１を受電側
電極３４に圧接させる。アクチュエ−タとしてはシリン
ダ等を用いてもよい。As shown in FIG. 1, a leaf spring 42 as a biasing member having a power feeding side electrode 41 is supported on the device frame 39 in a cantilevered manner at positions facing the power receiving side electrodes 34 and 36, respectively. There is. The leaf spring 42 is provided with an electromagnetic solenoid 44 as an actuator for pressing the power feeding side electrode 41 to the power receiving side electrode 34 via a link 43. When the electromagnetic solenoid 44 is excited, the power feeding side electrode 41 is brought into pressure contact with the power receiving side electrode 34. A cylinder or the like may be used as the actuator.
【００２９】パイプ状の加熱ロ−ラ３０の内部には第２
の発熱体としてハロゲンランプ５が設けてある。Inside the pipe-shaped heating roller 30, there is a second
A halogen lamp 5 is provided as a heating element.
【００３０】通電制御部４５は温度検出手段７から検出
信号を入力してハロゲンランプ５、給電側電極４１、電
磁ソレノイド４４への通電を制御している。The energization control section 45 inputs a detection signal from the temperature detecting means 7 and controls energization of the halogen lamp 5, the power supply side electrode 41 and the electromagnetic solenoid 44.
【００３１】次に第１実施例の動作について図７、８を
も加えて説明する。図７は第１実施例のタイムチャ−ト
であり、図８は通電時の動作を示す説明図である。Next, the operation of the first embodiment will be described with reference to FIGS. FIG. 7 is a time chart of the first embodiment, and FIG. 8 is an explanatory diagram showing an operation at the time of energization.
【００３２】時刻ｔ0 で電源を入れる。通電制御部４５
は電磁ソレノイド４４に通電し、図８に示すように、給
電側電極４１を受電側電極３４に圧接させ、加熱ロ−ラ
３０に通電して発熱させる。同時に、ハロゲンランプ５
にも通電し、ハロゲンランプ５を連続点灯して加熱ロ−
ラ３０を加熱する。通電制御部４５は温度検出手段７を
介して加熱ロ−ラ３０の表面温度を検知している。加熱
ロ−ラ３０は熱容量が小さくなったことにより暖まりや
すく、表面温度が急激に上昇する。尚、開始時のハロゲ
ンランプ５への通電は必須でなく、装置の最大消費電力
が規制される場合には加熱ロ−ラ３０を発熱させるだけ
であってもよい。At time t0, the power is turned on. Energization control unit 45
Energizes the electromagnetic solenoid 44, presses the power feeding side electrode 41 against the power receiving side electrode 34, and energizes the heating roller 30 to generate heat, as shown in FIG. At the same time, halogen lamp 5
Power is also supplied to the lamp, the halogen lamp 5 is continuously turned on, and the heating roll is turned on.
Heat LA 30. The energization control unit 45 detects the surface temperature of the heating roller 30 via the temperature detecting means 7. Since the heating roller 30 has a small heat capacity, the heating roller 30 is easily warmed, and the surface temperature rises rapidly. It should be noted that it is not essential to energize the halogen lamp 5 at the time of starting, and the heating roller 30 may only be caused to generate heat when the maximum power consumption of the device is restricted.
【００３３】時刻ｔ1 で通電制御部４５は加熱ロ−ラ３
０の表面温度が定着可能な設定温度Ｔに達したことを検
知すると、加熱ロ−ラ３０への通電を停止するととも
に、電磁ソレノイド４４への通電を停止して、図１に示
すように、受電側電極３４から給電側電極４１を解放す
る。以後、通電制御部４５はハロゲンランプ５への通電
制御で加熱ロ−ラ３０の表面温度をする。At time t1, the energization controller 45 turns on the heating roller 3
When it is detected that the surface temperature of 0 has reached the set temperature T at which fixing is possible, the heating roller 30 is de-energized and the electromagnetic solenoid 44 is de-energized, as shown in FIG. The power feeding side electrode 41 is released from the power receiving side electrode 34. After that, the energization control unit 45 controls the surface temperature of the heating roller 30 by controlling the energization of the halogen lamp 5.
【００３４】時刻ｔ2 で印刷が開始し、図示せぬ加熱定
着装置駆動源、用紙駆動源、画像形成部駆動源が起動し
て、図１に示すように、画像形成部１５からトナ−２ａ
を付着した用紙２が加熱定着装置１６に搬送されてく
る。加熱定着装置１６は圧接ロ−ラ４、加熱ロ−ラ３０
により用紙２を挟持搬送するとともに加熱圧着してトナ
−２ａを用紙２に融着する。At time t2, printing is started, and the heat fixing device drive source, sheet drive source, and image forming unit drive source (not shown) are activated, and as shown in FIG.
The sheet 2 attached with the is conveyed to the heat fixing device 16. The heat fixing device 16 includes a pressure roller 4 and a heat roller 30.
Thus, the sheet 2 is nipped and conveyed, and is heated and pressure-bonded to fuse the toner-2a to the sheet 2.
【００３５】第２実施例 次に第２実施例の動作について図９を加えて説明する。
図９は第２実施例のタイムチャ−トである。第２実施例
が第１実施例と異なるところは制御方法であって、構成
は同じである。第２実施例は第１の発熱体と第２の発熱
体とを用いて細密制御を行う。即ち、加熱ロ−ラ３０は
熱容量が小さいことから温まりやすく冷めやすいので第
１の発熱体を細密に制御することにより、設定温度に対
するオ−バ−シュ−ト温度範囲の狭い制御ができる。 Second Embodiment Next, the operation of the second embodiment will be described with reference to FIG.
FIG. 9 is a time chart of the second embodiment. The second embodiment is different from the first embodiment in the control method and has the same configuration. In the second embodiment, fine control is performed using the first heating element and the second heating element. That is, since the heating roller 30 has a small heat capacity, it is easy to warm up and cool down. Therefore, by controlling the first heating element minutely, the overshoot temperature range with respect to the set temperature can be controlled narrowly.
【００３６】時刻ｔ0 で電源を入れる。通電制御部４５
は電磁ソレノイド４４に通電し、図８に示すように、給
電側電極４１を受電側電極３４に圧接させ、加熱ロ−ラ
３０に給電して発熱させる。同時に、ハロゲンランプ５
にも給電し、ハロゲンランプ５を連続点灯して加熱ロ−
ラ３０を加熱する。通電制御部４５は温度検出手段７を
介して加熱ロ−ラ３０の表面温度を検知している。加熱
ロ−ラ３０は熱容量が小さくなったことにより暖まりや
すく、表面温度が急激に上昇する。At time t0, the power is turned on. Energization control unit 45
Energizes the electromagnetic solenoid 44, presses the power supply side electrode 41 against the power reception side electrode 34 as shown in FIG. 8, and supplies power to the heating roller 30 to generate heat. At the same time, halogen lamp 5
Power is also supplied to the halogen lamp 5 to continuously turn on the heating lamp.
Heat LA 30. The energization control unit 45 detects the surface temperature of the heating roller 30 via the temperature detecting means 7. Since the heating roller 30 has a small heat capacity, the heating roller 30 is easily warmed, and the surface temperature rises rapidly.
【００３７】時刻ｔ1 で通電制御部４５は加熱ロ−ラ３
０の表面温度が低温オフセットを発生せず、且つ定着可
能な第１の設定温度ＴL に達したことを検知し、加熱ロ
−ラ３０への給電を停止する。その後、加熱ロ−ラ３０
はハロゲンランプ５で加熱される。パルス的間欠給電に
切り替え、１パルス当たりの発生エネルギ量を少なくす
る。At time t1, the energization controller 45 causes the heating roller 3 to
It is detected that the surface temperature of 0 has reached the first set temperature TL at which the low temperature offset does not occur and which can be fixed, and the power supply to the heating roller 30 is stopped. Then, heating roller 30
Is heated by the halogen lamp 5. Switch to pulsed intermittent power supply to reduce the amount of energy generated per pulse.
【００３８】時刻ｔ2 で通電制御部４５は加熱ロ−ラ３
０の表面温度が第１の設定温度ＴLより若干高い値で、
高温オフセットを発生しない第２の設定温度ＴS に達し
たことを検知し、ハロゲンランプ５への給電をパルス的
間欠給電に切り替え、１パルス当たりの発生エネルギ量
を少なくする。以後、第２の設定温度ＴS を基準に温度
管理する。即ち、第２の設定温度ＴS に対して追従制御
する。加熱ロ−ラ３０の熱容量が小さくなり、肉厚が薄
くなったことにより熱伝導性がよくなってパルス的間欠
給電による細密な給電制御との効果でオ−バ−シュ−ト
温度範囲を狭めた追従性に優れた温度制御ができる。At time t2, the energization control unit 45 causes the heating roller 3 to
The surface temperature of 0 is slightly higher than the first set temperature TL,
Upon detecting that the temperature reaches the second set temperature Ts at which high temperature offset does not occur, the halogen lamp 5 is switched to intermittent power supply in a pulsed manner to reduce the amount of energy generated per pulse. After that, the temperature is controlled based on the second set temperature TS. That is, follow-up control is performed with respect to the second set temperature TS. Since the heat capacity of the heating roller 30 is reduced and the wall thickness is reduced, the heat conductivity is improved, and the overshoot temperature range is narrowed by the effect of fine power supply control by pulsed intermittent power supply. The temperature can be controlled with excellent followability.
【００３９】時刻ｔ3 で印刷が開始し、図示せぬ加熱定
着装置駆動源、用紙駆動源、画像形成部駆動源が起動し
て、図１に示すように、画像形成部１５からトナ−２ａ
を付着した用紙２が加熱定着装置１６に搬送されてく
る。加熱定着装置１６は圧接ロ−ラ４、加熱ロ−ラ３０
により用紙２を挟持搬送するとともに加熱圧着してトナ
−２ａを用紙２に融着する。At time t3, printing is started, and the heating and fixing device drive source, the sheet drive source, and the image forming unit drive source (not shown) are activated, and as shown in FIG.
The sheet 2 attached with the is conveyed to the heat fixing device 16. The heat fixing device 16 includes a pressure roller 4 and a heat roller 30.
Thus, the sheet 2 is nipped and conveyed, and is heated and pressure-bonded to fuse the toner-2a to the sheet 2.
【００４０】時刻ｔ4 で定着動作が終了すると、通電制
御部４５は加熱ロ−ラ３０を加熱する必要が無いのでハ
ロゲンランプ５への給電を停止する。When the fixing operation is completed at time t4, the energization control unit 45 does not need to heat the heating roller 30, so the power supply to the halogen lamp 5 is stopped.
【００４１】時刻ｔ5 で印刷が開始し、通電制御部４５
は再び定着動作を開始する。このとき通電制御部４５
は、加熱ロ−ラ３０の表面温度が第１の設定温度ＴL よ
り低ければ、ハロゲンランプ５、加熱ロ−ラ３０を連続
給電し、第１の設定温度ＴL より高ければ、ハロゲンラ
ンプ５に間欠給電する。Printing starts at time t5, and the energization control unit 45
Starts fixing operation again. At this time, the energization control unit 45
If the surface temperature of the heating roller 30 is lower than the first set temperature TL, the halogen lamp 5 and the heating roller 30 are continuously supplied with power, and if the surface temperature of the heating roller 30 is higher than the first set temperature TL, the halogen lamp 5 is intermittently supplied. Supply power.
【００４２】時刻ｔ6 で通電制御部４５はハロゲンラン
プ５を連続給電から間欠給電に切り替える。以後同じ動
作を繰り返す。At time t6, the energization control unit 45 switches the halogen lamp 5 from continuous power supply to intermittent power supply. After that, the same operation is repeated.
【００４３】図１０は変形例を示す概略断面図であり、
加熱ロ−ラ３０に圧接する加圧ロ−ラ５０をシリコンゴ
ム、ポリイミド等の耐熱性薄膜ベルト５１と、一対の軸
５２、５３で構成されるものに置換し、用紙２と加熱ロ
−ラ３０とが当接するニップ幅を増やしても本発明の効
果を損なうものでなく、加圧側部材の構造や材質に規制
さえるものではない。FIG. 10 is a schematic sectional view showing a modification.
The pressure roller 50, which is in pressure contact with the heating roller 30, is replaced by a heat resistant thin film belt 51 made of silicon rubber, polyimide or the like and a pair of shafts 52 and 53, and the paper 2 and the heating roller are replaced. Increasing the nip width with which 30 contacts does not impair the effects of the present invention, and does not limit the structure or material of the pressing side member.
【００４４】第１及び第２実施例では加熱ロ−ラを単繊
維カ−ボンファイバで薄肉パイプ状カ−ボンファイバ集
合体したが、ファインセラミックを使用した薄肉パイプ
状セラミックとし、外層、又は内層に金属被膜抵抗をメ
ッキ、又は焼付けしてもよい。 又、チタン酸バリウム
等の正の温度特性を有する抵抗体ロ−ラで構成し、その
表面に離形性を有する薄いコ−ト層を施したものを使用
してもよい。In the first and second embodiments, the heating roller is a thin-walled pipe-shaped carbon fiber aggregate made of a single fiber carbon fiber. However, a thin-walled pipe-shaped ceramic using fine ceramic is used, and the outer layer or the inner layer is used. The metal film resistor may be plated or baked on. Alternatively, a resistor roller having a positive temperature characteristic such as barium titanate and having a thin coat layer having releasability on its surface may be used.
【００４５】又、第１及び第２実施例では内部発熱体と
してハロゲンランプを使用したが、ニクロム線や薄膜電
気抵抗体であってもよい。Although the halogen lamp is used as the internal heating element in the first and second embodiments, it may be a nichrome wire or a thin film electric resistor.
【００４６】[0046]
【発明の効果】本発明は、以上説明したように構成され
ているので以下に記載される効果を奏する。Since the present invention is configured as described above, it has the following effects.
【００４７】加熱ロ−ラを熱容量の小さい薄肉パイプで
構成し、加熱ロ−ラを発熱させる外部発熱体と、加熱ロ
−ラ内部に設けられて加熱ロ−ラを加熱する内部発熱体
とを備えたことにより、第１の発熱体が加熱ロ−ラ外層
を直接的に加熱し、加熱ロ−ラ内部に設けられた第２の
発熱体が加熱ロ−ラを内部から間接的に加熱するので電
源を入れてから短時間で設定温度に達し、待ち時間を短
縮する。The heating roller is composed of a thin-walled pipe having a small heat capacity, and has an external heating element for heating the heating roller and an internal heating element provided inside the heating roller for heating the heating roller. With the provision, the first heating element directly heats the outer layer of the heating roller, and the second heating element provided inside the heating roller indirectly heats the heating roller from the inside. Therefore, the set temperature is reached in a short time after turning on the power, and the waiting time is shortened.
【００４８】又、設定温度を低温オフセットを発生せず
且つトナ−定着可能な第１の設定温度と高温オフセット
を発生せず且つトナ−定着可能な第２の設定温度とに設
定し、加熱ロ−ラの表面温度が第１の設定温度に達する
までは外部発熱体と内部発熱体とを発熱し、表面温度が
第１の設定温度に達した後は、小さい熱容量を利用して
外部発熱体への給電を停止し、内部発熱体への給電を間
欠給電に切り替えて表面温度を第２の設定温度に維持す
るように制御したことにより、均一なトナ−定着温度が
得られて印刷品位を向上させるとともに、節電効果をも
向上させる。Further, the set temperature is set to a first set temperature at which low temperature offset is not generated and toner fixing is possible and a second set temperature at which high temperature offset is not generated and toner fixing is possible, and the heating temperature is set. -The external heating element and the internal heating element generate heat until the surface temperature of the la reaches the first set temperature, and after the surface temperature reaches the first set temperature, the external heating element is utilized by using a small heat capacity. The power supply to the internal heating element was stopped and the power supply to the internal heating element was switched to intermittent power supply to control the surface temperature at the second set temperature, so that a uniform toner fixing temperature was obtained and the printing quality was improved. Along with improving the power saving effect.
【図１】第１実施例の加熱定着装置の概略構成図であ
る。FIG. 1 is a schematic configuration diagram of a heat fixing device according to a first embodiment.
【図２】従来例を示す概略構成図である。FIG. 2 is a schematic configuration diagram showing a conventional example.
【図３】従来例のタイムチャ−トである。FIG. 3 is a time chart of a conventional example.
【図４】電子写真式プリンタの概略模式図である。FIG. 4 is a schematic diagram of an electrophotographic printer.
【図５】加熱ロ−ラの拡大部分断面図である。FIG. 5 is an enlarged partial sectional view of a heating roller.
【図６】第１実施例の加熱ロ−ラを示す正面図である。FIG. 6 is a front view showing the heating roller of the first embodiment.
【図７】第１実施例のタイムチャ−トである。FIG. 7 is a time chart of the first embodiment.
【図８】通電時の動作を示す説明図である。FIG. 8 is an explanatory diagram showing an operation during energization.
【図９】第２実施例のタイムチャ−トである。FIG. 9 is a time chart of the second embodiment.
【図１０】変形例を示す概略断面図である。FIG. 10 is a schematic cross-sectional view showing a modified example.
１、１６ 加熱定着装置 ３、３０ 加熱ロ−ラ 1, 16 Heat fixing device 3, 30 Heat roller
Claims (9)
ロ−ラに回転自在な加圧ロ−ラを圧接し、発熱体により
定着可能な設定温度に加熱した加熱ロ−ラを回転しなが
ら印刷用紙を挟持してトナ−を印刷用紙に融着する加熱
定着装置において、 上記加熱ロ−ラは熱容量の小さい薄肉パイプで構成し、
上記発熱体は加熱ロ−ラを発熱させる外部発熱体と、加
熱ロ−ラ内部に加熱ロ−ラを加熱する内部発熱体とを備
えたことを特徴とする熱定着装置。1. A heating roller having a heating element is press-contacted to a heating roller having a heating element sandwiching a sheet conveying path, and the heating roller heated to a set temperature capable of being fixed by the heating element is rotated. While in the heating fixing device for sandwiching the printing paper and fusing the toner to the printing paper, the heating roller is composed of a thin pipe having a small heat capacity,
A heat fixing device, wherein the heating element comprises an external heating element for heating the heating roller and an internal heating element for heating the heating roller inside the heating roller.
熱ロ−ラの外層、又は内層を構成し、印刷用紙に当接す
る当接範囲外の両端部にそれぞれ電気抵抗部材に圧接し
た受電側電極部と、設定温度に基づいて受電側電極部に
電力を供給する給電手段とを設けた請求項１記載の加熱
定着装置。2. The power receiving side, wherein the external heating element constitutes an outer layer or an inner layer of the heating roller with an electric resistance member, and both ends of the heating roller which are not in contact with the printing paper are in pressure contact with the electric resistance member. 2. The heat fixing device according to claim 1, further comprising an electrode portion and a power supply means for supplying electric power to the power receiving side electrode portion based on a set temperature.
バを外層にロ−ラ長と同じ長さで、且つ均一な密度でロ
−ラ軸方向に並べ、耐熱性樹脂をバインダとして含浸さ
せた薄肉パイプ状カ−ボンファイバ複合体であり、その
表面には離形性を有するコ−ト層を施した請求項２記載
の加熱定着装置。3. The heating roller is formed by arranging a single fiber carbon fiber on the outer layer in the roller axial direction at the same length as the roller length and with a uniform density, and impregnating a heat resistant resin as a binder. 3. The heat fixing device according to claim 2, wherein the heat-fixing device is a thin pipe-shaped carbon fiber composite material, and a coating layer having releasability is applied to the surface thereof.
体に代えて薄肉パイプ状セラミックとし、外層又は内層
に金属被膜抵抗を設けた請求項３記載の加熱定着装置。4. The heat fixing device according to claim 3, wherein the thin pipe-shaped carbon fiber composite is replaced with a thin pipe-shaped ceramic, and a metal film resistor is provided in an outer layer or an inner layer.
する位置に設けた給電側電極部と、その給電側電極部を
受電側電極部から引離す方向に偏倚する偏倚部材と、上
記設定温度に基づき給電側電極部を受電側電極部に当接
させるアクチュエ−タとを有する請求項２記載、又は請
求項３記載、又は請求項４記載の加熱定着装置。5. The power feeding means includes a power feeding side electrode portion provided at a position facing the power receiving side electrode portion, a biasing member biasing the power feeding side electrode portion in a direction of separating the power feeding side electrode portion from the power receiving side electrode portion, and the setting. The heating and fixing device according to claim 2, 3 or 4, further comprising an actuator that brings the power supply side electrode portion into contact with the power reception side electrode portion based on temperature.
向に延在したハロゲンランプである請求項１記載、又は
請求項２記載、又は請求項３記載、又は請求項４記載の
加熱定着装置。6. The heating according to claim 1, 2, 3 or 4, wherein the internal heating element is a halogen lamp extending in the axial direction of the heating roller. Fixing device.
する耐熱性薄膜ベルトとその耐熱性薄膜ベルトを巻き掛
けた１対の回転自在なロ−ラとから構成した請求項１記
載、又は請求項２記載、又は請求項３記載、又は請求項
４記載の加熱定着装置。7. The pressure roller comprises a heat-resistant thin film belt which is in pressure contact with the heating roller and a pair of rotatable rollers wound around the heat-resistant thin film belt. Or the heat fixing device according to claim 2, claim 3, or claim 4.
発熱体によりトナ−定着可能な設定温度に達した後はそ
の表面温度を設定温度に維持する温度制御方法におい
て、 上記発熱体には上記加熱ロ−ラの外層を発熱させる外部
発熱体と、上記加熱ロ−ラ内部に設けられて加熱ロ−ラ
の内面を加熱する内部発熱体とを備え、 上記表面温度が上記設定温度に達するまでは上記加熱ロ
−ラを停止して上記外部発熱体と上記内部発熱体とを発
熱し、 上記表面温度が設定温度に達した後は上記外部発熱体へ
の給電を停止して上記加熱ロ−ラを回転し、上記内部発
熱体への間欠給電により上記表面温度を上記設定温度に
維持する温度制御方法。8. A temperature control method for maintaining a surface temperature of a heating roller having a heating element at a preset temperature after the surface temperature of the heating roller reaches a preset temperature at which toner can be fixed by the heating element. Includes an external heating element that heats the outer layer of the heating roller and an internal heating element that is provided inside the heating roller and heats the inner surface of the heating roller, and the surface temperature is at the set temperature. Until the temperature reaches, the heating roller is stopped to heat the external heating element and the internal heating element, and after the surface temperature reaches the set temperature, the power supply to the external heating element is stopped and the heating is performed. A temperature control method in which a roller is rotated and the surface temperature is maintained at the set temperature by intermittent power supply to the internal heating element.
ず且つトナ−定着可能な第１の設定温度と高温オフセッ
トを発生せず且つトナ−定着可能な第２の設定温度とに
設定し、上記表面温度が上記第１の設定温度に達するま
では上記加熱ロ−ラを停止して上記外部発熱体と上記内
部発熱体とを発熱し、上記表面温度が第１の設定温度に
達した後は上記外部発熱体への給電を停止して上記加熱
ロ−ラを回転し、上記内部発熱体への間欠給電により上
記表面温度を上記第２の設定温度に維持する請求項８記
載の温度制御方法。9. The set temperature is set to a first set temperature at which low temperature offset does not occur and toner fixing is possible and a second set temperature at which high temperature offset does not occur and toner fixing is possible. Until the surface temperature reaches the first set temperature, the heating roller is stopped to heat the external heating element and the internal heating element, and after the surface temperature reaches the first set temperature, The temperature control method according to claim 8, wherein the power supply to the external heating element is stopped, the heating roller is rotated, and the surface temperature is maintained at the second set temperature by intermittent power supply to the internal heating element. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30162993A JPH07160136A (en) | 1993-12-01 | 1993-12-01 | Thermal fixing device and temperature controlling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30162993A JPH07160136A (en) | 1993-12-01 | 1993-12-01 | Thermal fixing device and temperature controlling method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07160136A true JPH07160136A (en) | 1995-06-23 |
Family
ID=17899251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30162993A Pending JPH07160136A (en) | 1993-12-01 | 1993-12-01 | Thermal fixing device and temperature controlling method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07160136A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6108906A (en) * | 1996-02-16 | 2000-08-29 | Ricoh Company, Ltd. | Fixing device for an image forming apparatus and fixing roller for the same |
| KR100452551B1 (en) * | 2002-06-29 | 2004-10-14 | 삼성전자주식회사 | A Fusing Equipment of a Image Forming Apparatus |
| KR20200077025A (en) * | 2018-12-20 | 2020-06-30 | 한국철도기술연구원 | Apparatus and method for controlling power supply of rotary heating element |
-
1993
- 1993-12-01 JP JP30162993A patent/JPH07160136A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6108906A (en) * | 1996-02-16 | 2000-08-29 | Ricoh Company, Ltd. | Fixing device for an image forming apparatus and fixing roller for the same |
| US6122479A (en) * | 1996-02-16 | 2000-09-19 | Ricoh Company | Fixing device for an image forming apparatus and fixing roller for the same |
| KR100452551B1 (en) * | 2002-06-29 | 2004-10-14 | 삼성전자주식회사 | A Fusing Equipment of a Image Forming Apparatus |
| KR20200077025A (en) * | 2018-12-20 | 2020-06-30 | 한국철도기술연구원 | Apparatus and method for controlling power supply of rotary heating element |
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