JP2005181464A - Fixing device and image forming apparatus - Google Patents

Fixing device and image forming apparatus Download PDF

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JP2005181464A
JP2005181464A JP2003418842A JP2003418842A JP2005181464A JP 2005181464 A JP2005181464 A JP 2005181464A JP 2003418842 A JP2003418842 A JP 2003418842A JP 2003418842 A JP2003418842 A JP 2003418842A JP 2005181464 A JP2005181464 A JP 2005181464A
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fixing
belt
fixing device
fixing belt
induction heating
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Shigeo Kurotaka
重夫 黒高
Katsuhiro Echigo
勝博 越後
Takashi Fujita
貴史 藤田
Hisashi Kikuchi
尚志 菊地
Hiroyuki Kunii
博之 国井
Atsushi Nakato
淳 中藤
Yukimichi Someya
幸通 染矢
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Ricoh Co Ltd
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Ricoh Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To previously prevent a fire accident of a fixing belt to secure safety in a fixing device using the fixing belt or an image forming apparatus provided with the fixing device. <P>SOLUTION: The fixing device 100 for fixing an image on a sheet (recording medium) 22 passing the fixing nip is provided with an induction heating source 66, the fixing belt 30 for induction-heating by the induction heating source, and a pressure roller (opposite member) 70 for forming a fixing nip with the fixing belt. The fixing device comprises a temperature detection member 43 arranged oppositely to the induction heating source 66 by sandwiching the fixing belt 30 to be in contact with the fixing belt, and a control means 67 for controlling the induction heating source on the basis of the detected temperature of the temperature detection member. The temperature detection member 43 is provided to be supported with a belt guide member 40. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

この発明は、複写機、プリンタ、ファクシミリまたはそれらの複合機などの画像形成装置に関する。そのうち特に、像担持体上に形成したトナー画像を直接または間接的に転写して、シート・OHPフィルム等の記録媒体に画像を記録する電子写真式の画像形成装置に関する。および、そのような画像形成装置などにおいて、定着温度に加熱する定着部材とそれに押し当てる加圧部材間に記録媒体を通してそれら定着部材と加圧部材とで搬送しながら熱と圧とを加え、記録媒体上の未定着トナー画像を定着する定着装置に関するものである。   The present invention relates to an image forming apparatus such as a copying machine, a printer, a facsimile, or a complex machine thereof. In particular, the present invention relates to an electrophotographic image forming apparatus that directly or indirectly transfers a toner image formed on an image carrier and records the image on a recording medium such as a sheet / OHP film. In such an image forming apparatus or the like, recording is performed by applying heat and pressure while conveying the fixing member and the pressure member through a recording medium between a fixing member that is heated to a fixing temperature and a pressure member that is pressed against the fixing member. The present invention relates to a fixing device that fixes an unfixed toner image on a medium.

従来、電子写真式の画像形成装置に備える定着装置では、熱源で定着温度に加熱する定着ローラ・定着ベルト等の定着部材と、それに押し当てる加圧ローラ・加圧ベルト等の加圧部材との間に、未定着トナー画像の載った記録媒体を通してそれら定着部材と加圧部材を回転することにより搬送しながら熱と圧とを加え、トナー画像を記録媒体に定着するものが主である。熱源としては、一般に、ハロゲンランプを用いるハロゲンヒータを使用していた。   Conventionally, in a fixing device provided in an electrophotographic image forming apparatus, a fixing member such as a fixing roller and a fixing belt that is heated to a fixing temperature by a heat source, and a pressure member such as a pressure roller and a pressure belt that are pressed against the fixing member. In the meantime, the fixing member and the pressure member are rotated by rotating the fixing member and the pressure member through the recording medium on which the unfixed toner image is placed, and heat and pressure are applied to the toner image to fix the toner image on the recording medium. In general, a halogen heater using a halogen lamp has been used as a heat source.

ところで、近年、画像形成装置などでは、省エネルギの要請から、待機時にはゼロ・エネルギ待機モード(Zero Energy Standby Mode - ZESM)にすることが行われている。ゼロ・エネルギ待機モードでは、非画像形成時は熱源への通電をカットしてエネルギ消費をゼロにし、画像形成動作の開始にあわせて熱源へと通電し、定着装置の定着部材を定着温度まで昇温する。   Incidentally, in recent years, in an image forming apparatus or the like, a zero energy standby mode (Zero Energy Standby Mode-ZESM) is performed at the time of standby because of a request for energy saving. In the zero energy standby mode, during non-image formation, the power supply to the heat source is cut to reduce energy consumption, and the heat source is turned on when the image forming operation starts, and the fixing member of the fixing device is raised to the fixing temperature. Warm up.

このとき、定着ローラの肉厚を1mm以下にするなど、定着部材の熱容量を小さくし、温度応答性を高めて定着可能となるまでの立ち上がり時間を10秒程度にまで短縮するようにすると、省エネとともにユーザーの利便性も向上することができた。   At this time, by reducing the heat capacity of the fixing member, such as by reducing the wall thickness of the fixing roller to 1 mm or less, and improving the temperature responsiveness and shortening the rise time until fixing is possible to about 10 seconds, energy saving is achieved. At the same time, the convenience of users was improved.

他方、定着部材を剛体で形成すると、定着時に記録媒体の凹凸に追従することができず、微小な光沢ムラなどの画質劣化を生ずる。特にモノクロ機では問題とならないレベルでも、近年多くなってきているカラー機では大きな問題となることから、カラー機の場合は定着面が弾性を保持することは高画質化のため必須のことであった。   On the other hand, if the fixing member is formed of a rigid body, it cannot follow the unevenness of the recording medium at the time of fixing, and image quality deterioration such as minute gloss unevenness occurs. Even at a level that is not a problem for monochrome machines in particular, color machines, which are increasing in number in recent years, become a big problem. For color machines, maintaining the elasticity of the fixing surface is essential for improving image quality. It was.

このような要請から、従来の画像形成装置の中には、例えば図10に示すように、両側に設ける不図示のベルト搬送形状保持部材で、図示するごとく搬送形状を筒状に保持する定着ベルト1と、その定着ベルト1の内部に配置するニップ形成部材2と、定着ベルト1を挟んでニップ形成部材2に押し当てて定着ニップを形成する加圧ローラ3と、その加圧ローラ3を押し当てると反対の側で定着ベルト1と対向してその定着ベルト1を誘導加熱する誘導加熱源4と、その誘導加熱源4と加圧ローラ3との中間に設けて定着ベルト1に対向し、その定着ベルト1の温度を検知する温度検知部材5と、その温度検知部材5の検知温度に基づき誘導加熱源4を制御する不図示の制御手段とで構成するものがある。   In view of such a demand, in a conventional image forming apparatus, as shown in FIG. 10, for example, a fixing belt that holds a conveyance shape in a cylindrical shape as shown in the figure by belt conveyance shape holding members (not shown) provided on both sides. 1, a nip forming member 2 disposed inside the fixing belt 1, a pressure roller 3 that presses against the nip forming member 2 across the fixing belt 1 to form a fixing nip, and presses the pressure roller 3. On the opposite side, opposite to the fixing belt 1, an induction heating source 4 that induction heats the fixing belt 1, and an intermediate between the induction heating source 4 and the pressure roller 3 that faces the fixing belt 1, There is a configuration including a temperature detection member 5 that detects the temperature of the fixing belt 1 and a control unit (not shown) that controls the induction heating source 4 based on the temperature detected by the temperature detection member 5.

ニップ形成部材2は、支持部材6に断熱部材7を介して耐熱弾性部材8を設け、その耐熱弾性部材8を保護部材9で被ってなる。   The nip forming member 2 includes a heat-resistant elastic member 8 provided on a support member 6 via a heat insulating member 7, and the heat-resistant elastic member 8 is covered with a protective member 9.

そして、図示するように、定着ニップに、未定着トナー画像の載った記録媒体pを通して、加圧ローラ3を回転することにより定着ベルト1を走行して搬送しながら熱と圧とを加え、トナー画像tを記録媒体pに定着していた。   Then, as shown in the drawing, heat and pressure are applied to the fixing nip while running and transporting the fixing belt 1 by rotating the pressure roller 3 through the recording medium p on which the unfixed toner image is placed. The image t was fixed on the recording medium p.

特開2002-148983号公報Japanese Patent Laid-Open No. 2002-148983

ところが、このような定着装置では、予期せぬ事由により、定着ベルト1がスリップしたり定着ベルト1の走行を停止したりするなどのベルト走行不良が発生したとき、誘導加熱源4によりそれと対向するベルト面が異常に加熱されることとなる。しかし、誘導加熱源4と対向する定着ベルト面から離れた位置にある温度検知部材5によっては、その異常な温度上昇を検知することができず、定着ベルト1の焼損を招くおそれがあり、定着ベルト1の発火事故を未然に防ぐことができない問題があった。   However, in such a fixing device, when a belt running failure such as the fixing belt 1 slips or stops running of the fixing belt 1 due to an unexpected reason, the induction heating source 4 faces it. The belt surface is heated abnormally. However, depending on the temperature detection member 5 located away from the fixing belt surface facing the induction heating source 4, the abnormal temperature rise cannot be detected, and the fixing belt 1 may be burned out. There was a problem that the fire accident of the belt 1 could not be prevented.

そこで、この発明の目的は、定着ベルトを使用する定着装置、またはそのような定着装置を備える画像形成装置において、定着ベルトの発火事故を未然に防止して安全性を確保することにある。   SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to prevent a fixing belt from firing accidents and ensure safety in a fixing device using a fixing belt or an image forming apparatus including such a fixing device.

かかる目的を達成すべく、この発明は、誘導加熱源と、その誘導加熱源により誘導加熱する定着ベルトと、その定着ベルトとの間で定着ニップを形成する対向部材とを備え、前記定着ニップを通過する記録媒体上の画像を定着する定着装置において、前記定着ベルトを挟んで前記誘導加熱源と対向する温度検知部材と、その温度検知部材の検知温度に基づき前記誘導加熱源を制御する制御手段とを備える、ことを特徴とする。   In order to achieve this object, the present invention comprises an induction heating source, a fixing belt that is induction-heated by the induction heating source, and an opposing member that forms a fixing nip with the fixing belt, In a fixing device for fixing an image on a passing recording medium, a temperature detection member facing the induction heating source with the fixing belt interposed therebetween, and control means for controlling the induction heating source based on a detected temperature of the temperature detection member It is characterized by comprising.

前記温度検知部材は、前記定着ベルトに接触して備えるとよく、また前記定着ベルトを挟んで前記誘導加熱源と対向するベルトガイド部材で支持して備えるとよい。前記ベルトガイド部材は、切欠き孔をあけ、その切欠き孔を通して前記温度検知部材を前記誘導加熱源と対向するとよく、それに円弧状のベルトガイド面を設けるとよい。また、磁性または非磁性で、絶縁耐熱材料でつくるとよい。   The temperature detection member may be provided in contact with the fixing belt, and may be supported by a belt guide member facing the induction heating source with the fixing belt interposed therebetween. The belt guide member may be formed with a notch hole, the temperature detecting member may be opposed to the induction heating source through the notch hole, and an arcuate belt guide surface may be provided thereon. Also, it may be made of an insulating heat resistant material that is magnetic or non-magnetic.

前記定着ベルトは、薄肉低熱容量で、可撓性を有する無端ループ状とするとよく、無端ループ状の前記定着ベルトの両側縁を案内して、前記定着ベルトの搬送形状を円筒状に保持するベルト搬送形状保持部材を備えるとよい。また、前記定着ベルトに裏当てして前記対向部材との間で定着ニップを形成するニップ形成部材を備え、そのニップ形成部材が前記定着ベルトと接触する側を弾性発泡体層とするとよく、前記定着ベルトに裏当てして前記対向部材との間で定着ニップを形成するニップ形成部材を備え、そのニップ形成部材をローラ形状としてもよい。   The fixing belt is preferably a thin endless loop having a low heat capacity and flexibility, and guides both side edges of the endless loop fixing belt to hold the conveying shape of the fixing belt in a cylindrical shape. It is good to provide a conveyance shape holding member. Further, a nip forming member that forms a fixing nip between the fixing belt and the opposed member may be provided, and a side of the nip forming member that contacts the fixing belt may be an elastic foam layer. A nip forming member that backs the fixing belt and forms a fixing nip with the facing member may be provided, and the nip forming member may have a roller shape.

そして、対向部材は、断熱ローラとするとよい。   The counter member may be a heat insulating roller.

また、上述した目的を達成すべく、この発明は、画像形成装置において、以上のような定着装置を備える、ことを特徴とする。   In order to achieve the above-described object, the present invention is characterized in that the image forming apparatus includes the fixing device as described above.

請求項1に記載の発明によれば、定着ベルトを挟んで誘導加熱源と対向する温度検知部材と、その温度検知部材の検知温度に基づき誘導加熱源を制御する制御手段とを備えるので、予期せぬ事由により、定着ベルトがスリップしたり定着ベルトの走行を停止したりするなどのベルト走行不良が発生したとき、誘導加熱源によりそれと対向するベルト面が異常に加熱されることとなるが、誘導加熱源と対向する位置にある温度検知部材によって、その異常な温度上昇を検知することができ、定着ベルトの焼損を招くおそれなく、定着ベルトの発火事故を未然に防いで安全性を確保することができる。   According to the first aspect of the present invention, the temperature detection member facing the induction heating source with the fixing belt interposed therebetween and the control means for controlling the induction heating source based on the detected temperature of the temperature detection member are provided. When a belt running failure such as the fixing belt slipping or stopping the running of the fixing belt due to an unforeseen reason, the belt surface facing it is abnormally heated by the induction heating source. An abnormal temperature rise can be detected by the temperature detection member located at the position facing the induction heating source, preventing the fixing belt from being burned out, and preventing the fixing belt from being ignited to ensure safety. be able to.

請求項2に記載の発明によれば、温度検知部材を定着ベルトに接触して備えるので、温度検知部材による温度検知を安定化して正確に行うことができる。   According to the second aspect of the invention, since the temperature detection member is provided in contact with the fixing belt, temperature detection by the temperature detection member can be stabilized and accurately performed.

請求項3に記載の発明によれば、定着ベルトを挟んで誘導加熱源と対向してベルトガイド部材を備え、そのベルトガイド部材で支持して温度検知部材を備えるので、定着ベルトを変形したりすることなく、温度検知部材による温度検知を安定化して正確に行うことができる。   According to the third aspect of the present invention, the belt guide member is provided opposite to the induction heating source with the fixing belt interposed therebetween, and the temperature detection member is supported by the belt guide member. Without this, temperature detection by the temperature detection member can be stabilized and accurately performed.

請求項4に記載の発明によれば、ベルトガイド部材に切欠き孔をあけ、その切欠き孔を通して温度検知部材を誘導加熱源と対向するので、ベルトガイドと温度検知を同一位置で行うことができ、省スペース化を図ることができる。   According to the fourth aspect of the present invention, since the notch hole is formed in the belt guide member and the temperature detection member is opposed to the induction heating source through the notch hole, the belt guide and the temperature detection can be performed at the same position. It is possible to save space.

請求項5に記載の発明によれば、ベルトガイド部材に円弧状のベルトガイド面を設けるので、別にガイド部材を設けることなく、ベルトガイド部材のベルトガイド面で案内して例えば対向部材の回転により定着ベルトを走行することができる。   According to the fifth aspect of the invention, since the belt guide member is provided with the arcuate belt guide surface, the belt guide member is guided by the belt guide surface of the belt guide member without providing a separate guide member, for example, by rotation of the opposing member. The fixing belt can be driven.

請求項6に記載の発明によれば、ベルトガイド部材を、磁性で、絶縁耐熱材料でつくるので、誘導加熱源からの磁力線がベルトガイド部材に集中して密となり、表面非磁性である温度検知部材には集中しにくく疎となる。よって、磁気シールド効果により磁力線の影響を受け難くし、温度検知部材の自己発熱を防止して正確な温度検知を可能とするとともに、定着ベルトの加熱効率を向上することができる。   According to the sixth aspect of the present invention, since the belt guide member is made of a magnetic and insulating heat-resistant material, the magnetic force lines from the induction heating source are concentrated on the belt guide member and become dense, and the temperature detection is non-magnetic on the surface. It is difficult to concentrate on the member and it becomes sparse. Therefore, the magnetic shield effect makes it difficult to be affected by the lines of magnetic force, prevents self-heating of the temperature detection member, enables accurate temperature detection, and improves the heating efficiency of the fixing belt.

請求項7に記載の発明によれば、ベルトガイド部材を、非磁性で、絶縁耐熱材料でつくるので、ベルトガイド部材の発熱を防止して定着ベルトの加熱効率を高めることができる。また、磁気作用によるノイズによって、温度検知部材による正確な温度検知が妨げられるおそれを解消することができる。   According to the seventh aspect of the present invention, since the belt guide member is made of a non-magnetic and insulating heat resistant material, heat generation of the belt guide member can be prevented and the heating efficiency of the fixing belt can be increased. In addition, it is possible to eliminate the possibility that accurate temperature detection by the temperature detection member is hindered by noise due to magnetic action.

請求項8に記載の発明によれば、定着ベルトを、薄肉低熱容量で、可撓性を有する無端ループ状とするので、ベルト加熱効率を上げて30秒以下、好ましくは10秒以下で立ち上げることができる。また、無端ループ状の定着ベルトの内部に温度検知部材を配置するようにし、定着ベルトに傷が付きにくく、仮に傷が付いても画像に影響することがなく、ベルトの耐久性を向上することができる。   According to the invention described in claim 8, since the fixing belt is formed into an endless loop having a thin wall and a low heat capacity and having flexibility, the belt heating efficiency is increased for 30 seconds or less, preferably 10 seconds or less. be able to. In addition, a temperature detection member is arranged inside the endless loop-shaped fixing belt so that the fixing belt is not easily scratched, and even if scratched, the image is not affected and the durability of the belt is improved. Can do.

請求項9に記載の発明によれば、無端ループ状の定着ベルトの両側縁を案内して、定着ベルトの搬送形状を円筒状に保持するベルト搬送形状保持部材を備えるので、定着装置の小型化を図り、省スペース化を達成することができる。また、温度検知部材の接触圧の変動を少なくして、定着ベルトの温度検知を安定的に行うことができる。   According to the ninth aspect of the present invention, since the belt conveying shape holding member that guides both side edges of the endless loop-shaped fixing belt and holds the conveying shape of the fixing belt in a cylindrical shape is provided, the fixing device can be downsized. And space saving can be achieved. Further, it is possible to stably detect the temperature of the fixing belt by reducing the fluctuation of the contact pressure of the temperature detecting member.

請求項10に記載の発明によれば、定着ベルトに裏当てして対向部材との間で定着ニップを形成するニップ形成部材を備え、そのニップ形成部材が定着ベルトと接触する側を弾性発泡体層とするので、低圧で広幅な定着ニップを確保し、断熱効果と相俟って、低温での瞬時立ち上げを可能とすることができる。   According to a tenth aspect of the present invention, a nip forming member is provided that forms a fixing nip with the opposing member by backing the fixing belt, and the side where the nip forming member contacts the fixing belt is an elastic foam. Since it is a layer, it is possible to secure a wide fixing nip at a low pressure, and in combination with the heat insulating effect, it is possible to instantaneously start up at a low temperature.

請求項11に記載の発明によれば、定着ベルトに裏当てして対向部材との間で定着ニップを形成するニップ形成部材を備え、そのニップ形成部材をローラ形状とするので、定着ベルトの円滑な走行を可能とし、断熱効果と相俟って、低温での瞬時立ち上げを可能とすることができる。   According to the eleventh aspect of the present invention, the fixing belt is provided with a nip forming member that backs the fixing belt and forms a fixing nip with the opposing member, and the nip forming member has a roller shape. It is possible to make it possible to run smoothly at a low temperature in combination with the heat insulation effect.

請求項12に記載の発明によれば、対向部材を断熱ローラとするので、定着ベルトからの熱伝導を小さくして熱損失を低減し、ベルト加熱効率を上げることができる。また、対向部材として、定着ベルトよりも硬度が大きい断熱ローラを用いることにより、定着ベルトの走行を安定することができる。   According to the twelfth aspect of the present invention, since the opposing member is a heat insulating roller, heat conduction from the fixing belt can be reduced to reduce heat loss, and belt heating efficiency can be increased. Further, by using a heat insulating roller having a hardness higher than that of the fixing belt as the opposing member, it is possible to stabilize the running of the fixing belt.

請求項13に記載の発明によれば、画像形成装置にあって、以上のような定着装置を備えるので、上述した各効果を有する定着装置を備えた画像形成装置を提供することができる。   According to the thirteenth aspect of the present invention, since the image forming apparatus includes the above-described fixing device, an image forming apparatus including the fixing device having the above-described effects can be provided.

以下、図面を参照しつつ、この発明の実施の最良形態につき説明する。
図1には、間接転写4連ダンデム方式のカラー電子写真画像形成装置を示す。
The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 shows a color electrophotographic image forming apparatus of indirect transfer quadruple dandem system.

図中符号10c、10m、10y、10bは、それぞれシアン、マゼンタ、イエロ、ブラックの4つの作像装置であり、タンデム式に並べて備える。各作像装置では、それぞれドラム状の像担持体11c、11m、11y、11bを備え、その図中時計まわりの回転にともない、まず各帯電装置12c、12m、12y、12bで表面を一様に帯電し、次いで共通の書込み装置13からのレーザ光Lc、Lm、Ly、Lbで書き込みを行い、そののち各現像装置14c、14m、14y、14bでトナーを付着して像担持体11c、11m、11y、11b上に各々各色単色画像を形成する。   Reference numerals 10c, 10m, 10y, and 10b in the figure are four image forming apparatuses of cyan, magenta, yellow, and black, respectively, and are arranged in tandem. Each image forming device is provided with a drum-shaped image carrier 11c, 11m, 11y, 11b, respectively, and the surface is uniformly made uniform by each charging device 12c, 12m, 12y, 12b as it rotates clockwise in the figure. Then, writing is performed with laser beams Lc, Lm, Ly, and Lb from a common writing device 13, and then toner is attached to each of the developing devices 14c, 14m, 14y, and 14b, and the image carriers 11c, 11m, A single color image is formed on each of 11y and 11b.

そして、無端ベルト状の中間転写体15を図中反時計まわりに走行して各一次転写装置16c、16m、16y、16bにより像担持体11c、11m、11y、11b上の各色単色画像を一次転写し、中間転写体15上にフルカラー画像を形成する。   Then, the endless belt-like intermediate transfer member 15 is run counterclockwise in the drawing, and the primary transfer devices 16c, 16m, 16y, and 16b transfer the single color images on the image carriers 11c, 11m, 11y, and 11b to the primary transfer device. Then, a full color image is formed on the intermediate transfer member 15.

一方、適宜タイミングで給送ローラ20を回転してシートカセット21内のシート22を繰り出し、シート搬送路23を通して搬送して一対のレジストローラ24間に突き当てて止める。そして、中間転写体15上のフルカラー画像にタイミングを合わせて一対のレジストローラ24を回転し、二次転写装置25によりそのフルカラー画像をシート22に二次転写する。そののち、フルカラー画像転写後のシート22をシート搬送路23を通してそのまま上方へと搬送し、定着装置100の定着ニップを通過するとき未定着転写トナーをシート22に定着し、排出ローラ26で排出して画像形成装置本体上のシートスタック部27上にスタックする。   On the other hand, the feeding roller 20 is rotated at an appropriate timing to feed out the sheet 22 in the sheet cassette 21, conveyed through the sheet conveying path 23, and abutted between the pair of registration rollers 24 and stopped. Then, the pair of registration rollers 24 are rotated in synchronization with the full color image on the intermediate transfer member 15, and the full color image is secondarily transferred to the sheet 22 by the secondary transfer device 25. After that, the sheet 22 after full color image transfer is conveyed upward as it is through the sheet conveyance path 23, and unfixed transfer toner is fixed on the sheet 22 when passing through the fixing nip of the fixing device 100, and discharged by the discharge roller 26. To be stacked on the sheet stack portion 27 on the image forming apparatus main body.

一次転写終了後の各像担持体11c、11m、11y、11bは、一次クリーニング装置17c、17m、17y、17bでクリーニングして残トナーを除去する。二次転写終了後の中間転写体15は、二次クリーニング装置18でクリーニングして残トナーを除去する。   The image carriers 11c, 11m, 11y, and 11b after the completion of the primary transfer are cleaned by the primary cleaning devices 17c, 17m, 17y, and 17b to remove residual toner. After the completion of the secondary transfer, the intermediate transfer member 15 is cleaned by the secondary cleaning device 18 to remove residual toner.

図中符号28c、28m、28y、28bは、それぞれ各色現像装置14c、14m、14y、14bにトナーを補給するトナー補給装置である。   Reference numerals 28c, 28m, 28y, and 28b in the figure denote toner replenishing devices that replenish toner to the color developing devices 14c, 14m, 14y, and 14b, respectively.

図2には、軸方向から見て定着装置100の概略構成を示す。
図中符号30は、可撓性を有する無端ループ状の定着ベルトである。定着ベルト30は、厚さが50〜120μm、好ましくは50〜100μmで、20〜80φ、好ましくは30〜50φとし、3層以上とする。
FIG. 2 shows a schematic configuration of the fixing device 100 as viewed from the axial direction.
Reference numeral 30 in the drawing is an endless loop fixing belt having flexibility. The fixing belt 30 has a thickness of 50 to 120 μm, preferably 50 to 100 μm, 20 to 80 φ, preferably 30 to 50 φ, and three or more layers.

図3(A)および(B)には、定着ベルト30の部分拡大断面を示す。
図3(A)から判るとおり、定着ベルト30は、例えば基材層31と発熱層32と中間弾性層33と表面離型層34とで構成する。
3A and 3B show partially enlarged cross sections of the fixing belt 30. FIG.
As can be seen from FIG. 3A, the fixing belt 30 includes, for example, a base material layer 31, a heat generation layer 32, an intermediate elastic layer 33, and a surface release layer 34.

基材層31は、50〜100μmのポリイミド・ポリアミド等の耐熱樹脂材料、10〜50μmのニッケル・ステンレス等の金属材料でつくる。発熱層32は、導電性のニッケル・ステンレス・銀・銅などの金属材料でつくる。中間弾性層33は、均一定着を狙って50〜300μmのケイ素ゴム・フッ素ゴムなどの耐熱弾性材料でつくる。そして、表面離型層34は、離型効果やオイルレスを狙って10〜30μmのフッ素樹脂材料などでつくる。   The base material layer 31 is made of a heat-resistant resin material such as polyimide of 100 to 100 μm and a metal material such as nickel and stainless steel of 10 to 50 μm. The heat generating layer 32 is made of a conductive metal material such as nickel, stainless steel, silver, or copper. The intermediate elastic layer 33 is made of a heat-resistant elastic material such as silicon rubber or fluororubber having a thickness of 50 to 300 μm for uniform fixing. The surface release layer 34 is made of a fluororesin material having a thickness of 10 to 30 μm for the purpose of releasing effect and oilless.

図3(B)に示すように、基材層31と発熱層32とを一体化した発熱基材層35を設け、3層構造としてもよい。   As shown in FIG. 3B, a heat generating base material layer 35 in which the base material layer 31 and the heat generating layer 32 are integrated may be provided to have a three-layer structure.

そして、(0.019〜0.077)J/kcmの薄肉低熱容量とし、後述する誘導加熱源66によるベルト加熱効率を上げて瞬時立ち上げ(30秒以下、好ましくは10秒以下)を可能とする。 And (0.019-0.077) J / kcm 2 thin and low heat capacity, the belt heating efficiency by induction heating source 66 to be described later can be increased and instantaneous startup (30 seconds or less, preferably 10 seconds or less) is possible. And

図2に示すように、そのような無端ループ状の定着ベルト30の内部には、ベルトガイド部材40とニップ形成部材50を備える。   As shown in FIG. 2, a belt guide member 40 and a nip forming member 50 are provided inside such an endless loop-shaped fixing belt 30.

図4(A)および(B)には、ベルトガイド部材40の側面と平面形状を示す。
図から判るとおり、ベルトガイド部材40は、平面状の第1の帯板部41と、湾曲した第2の帯板部42とからなる。
4A and 4B show a side surface and a planar shape of the belt guide member 40. FIG.
As can be seen from the figure, the belt guide member 40 is composed of a flat first strip 41 and a curved second strip 42.

第1の帯板部41には、中間に、温度検知部材43を取り付ける。他方、第2の帯板部42には、外面に円弧状のベルトガイド面44を設け、中間に矩形状の切欠き孔45をあける。切欠き孔45は、温度検知部材43の検知面を外部に臨ませて定着ベルト30を挟んで後述する誘導加熱源66と対向し、定着ベルト30の温度を検知する。ベルトガイド面44には、ベルト摺動抵抗を少なくするため、フッ素樹脂・シリコーンオイル・ステアリン酸亜鉛・ワックスなどを塗布するなどして低摩擦とする。   A temperature detecting member 43 is attached to the first band plate portion 41 in the middle. On the other hand, the second belt plate portion 42 is provided with an arcuate belt guide surface 44 on the outer surface, and a rectangular cutout hole 45 is formed in the middle. The cutout hole 45 faces the induction heating source 66 (to be described later) with the detection surface of the temperature detection member 43 facing outside and sandwiches the fixing belt 30 to detect the temperature of the fixing belt 30. In order to reduce belt sliding resistance, the belt guide surface 44 is made to have low friction by applying a fluororesin, silicone oil, zinc stearate, wax, or the like.

温度検知部材43は、サーモスタットや温度ヒューズなどで、温度検知に悪影響を与えないように、例えば定着ベルト30の基材層31をポリイミドで形成したときは10gr以下で定着ベルト30に接触して設ける。温度検知部材43は、近接するだけで、定着ベルト30には接触しないように設けてもよい。   For example, when the base material layer 31 of the fixing belt 30 is formed of polyimide, the temperature detecting member 43 is provided in contact with the fixing belt 30 so as not to adversely affect the temperature detection by a thermostat or a thermal fuse. . The temperature detection member 43 may be provided so as not to come into contact with the fixing belt 30 only in proximity.

ニップ形成部材50は、支持部材51と断熱部材52と耐熱弾性部材53とで構成し、耐熱弾性部材53を保護部材54で被ってなる。支持部材51は、一般的には、鉄・ステンレス・アルミニウムなどの金属材料を用いてつくる。炭素繊維強化金属を用いてつくってもよい。耐熱弾性部材53は、弾性発泡体を用いて矩形状につくり、表面を後述する加圧ローラの表面硬度と等しいかまたはそれより小さくする。   The nip forming member 50 includes a support member 51, a heat insulating member 52, and a heat resistant elastic member 53, and the heat resistant elastic member 53 is covered with a protective member 54. The support member 51 is generally made using a metal material such as iron, stainless steel, or aluminum. You may make using a carbon fiber reinforced metal. The heat-resistant elastic member 53 is formed in a rectangular shape using an elastic foam, and the surface thereof is equal to or smaller than the surface hardness of a pressure roller described later.

図5には、定着ベルト30の片側端部を示す。
この図5から判るとおり、ニップ形成部材50の支持部材51の両端は、それぞれベルト搬送形状保持部材60を貫通して定着側板61の不図示の長孔で支持し、先端に被付勢部材62を取り付ける。被付勢部材62は、加圧スプリング63で付勢されている。これにより、ニップ形成部材50は、弾性発泡体よりなる耐熱弾性部材53を定着ベルト30に押し当て裏当てしてなる。
FIG. 5 shows one end of the fixing belt 30.
As can be seen from FIG. 5, both ends of the support member 51 of the nip forming member 50 pass through the belt conveyance shape holding member 60 and are supported by long holes (not shown) of the fixing side plate 61, and a biased member 62 is provided at the tip. Install. The biased member 62 is biased by a pressure spring 63. Thus, the nip forming member 50 is formed by pressing and backing the heat-resistant elastic member 53 made of an elastic foam against the fixing belt 30.

ベルト搬送形状保持部材60は、鍔部64を有する円形形状で、外周で無端ループ状の定着ベルト30の軸方向両端縁を案内して、定着ベルト30の搬送形状をほぼ円筒状に保持する。このベルト搬送形状保持部材60によって、ベルトガイド部材40の両端も保持する。   The belt conveyance shape holding member 60 has a circular shape having a flange portion 64 and guides both end edges in the axial direction of the endless loop-shaped fixing belt 30 on the outer periphery to hold the conveyance shape of the fixing belt 30 in a substantially cylindrical shape. Both ends of the belt guide member 40 are also held by the belt conveyance shape holding member 60.

図2に示すように、定着ベルト30のまわりには、定着ベルト30を挟んでベルトガイド部材60と対向し、ベルト面に沿って誘導加熱源66を配置する。誘導加熱源66は、定着ベルト30の発熱層32を誘導加熱するものであり、ハロゲンランプ方式に比べると、次のような特徴がある。   As shown in FIG. 2, an induction heating source 66 is disposed around the fixing belt 30 so as to face the belt guide member 60 with the fixing belt 30 interposed therebetween and along the belt surface. The induction heating source 66 is for inductively heating the heat generating layer 32 of the fixing belt 30 and has the following characteristics as compared with the halogen lamp system.

1)エネルギ変換効率が高い。ハロゲンランプ方式より10%高い85%で、立ち上がり時間が早くなる。
2)周波数を変えることで出力を可変できる。
3)加熱物の磁気的性質を利用した自己温度調節が可能である。被加熱物を直接加熱するため、温度制御に対するタイムラグが小さいなどのメリットを有し、温度リップルが少ない。
1) High energy conversion efficiency. At 85%, which is 10% higher than that of the halogen lamp method, the rise time is shortened.
2) The output can be varied by changing the frequency.
3) Self-temperature control using the magnetic properties of the heated object is possible. Since the object to be heated is directly heated, there are advantages such as a small time lag for temperature control, and there are few temperature ripples.

この誘導加熱源66は、制御手段67を介して温度検知部材43と接続し、温度検知部材43の検知温度に基づき制御手段67でオンオフ制御する。   The induction heating source 66 is connected to the temperature detection member 43 via the control means 67 and is turned on / off by the control means 67 based on the temperature detected by the temperature detection member 43.

ところで、ベルトガイド部材40は、例えば図6に示すように、フェライト、または耐熱樹脂材料・耐熱ガラス・セラミックスなどの表面にフェライトの薄層を形成したものなど、磁性を有する絶縁耐熱材料でつくる。   Incidentally, as shown in FIG. 6, for example, the belt guide member 40 is made of an insulating heat-resistant material having magnetism, such as ferrite or a thin layer of ferrite formed on the surface of a heat-resistant resin material, heat-resistant glass, ceramics or the like.

このようにすると、誘導加熱源66からの磁力線Mがベルトガイド部材40に集中して密となり、表面非磁性である温度検知部材には集中しにくく疎となる。よって、磁気シールド効果により磁力線の影響を受け難くし、温度検知部材43の自己発熱を防止して正確な温度検知を可能とするとともに、定着ベルトの加熱効率を向上することができる。   In this way, the magnetic lines of force M from the induction heating source 66 are concentrated on the belt guide member 40 and become dense, and are hardly concentrated on the temperature detection member that is non-magnetic on the surface. Therefore, the magnetic shield effect makes it difficult to be affected by the lines of magnetic force, prevents self-heating of the temperature detecting member 43, enables accurate temperature detection, and improves the heating efficiency of the fixing belt.

なお、ベルトガイド部材40は、耐熱樹脂材料・耐熱ガラス・セラミックスなどの非磁性の絶縁耐熱材料でつくってもよい。すると、ベルトガイド部材40の発熱を防止して定着ベルト30の加熱効率を高めることができる。また、磁気作用によるノイズによって、温度検知部材43による正確な温度検知が妨げられるおそれを解消することができる。   The belt guide member 40 may be made of a nonmagnetic insulating heat resistant material such as a heat resistant resin material, heat resistant glass, or ceramics. As a result, heat generation of the belt guide member 40 can be prevented and the heating efficiency of the fixing belt 30 can be increased. Moreover, the possibility that accurate temperature detection by the temperature detection member 43 is hindered by noise due to magnetic action can be eliminated.

さて、図2に示すように、ニップ形成部材50の耐熱弾性部材53には、保護部材54を介して、対向部材である加圧ローラ70を押し当て、その加圧ローラ70との間で定着ニップを形成する。   Now, as shown in FIG. 2, the pressure roller 70, which is an opposing member, is pressed against the heat-resistant elastic member 53 of the nip forming member 50 via the protection member 54, and fixing is performed between the pressure roller 70. Form a nip.

加圧ローラ70は、3層以上で、20〜80φとし、断熱ローラとする。例えば、シリコーンゴム発泡体、シリコーン層内に中空子・中空バルーン等を設けて空気含有率を上げたものなどを用いる。シリコーン層内に中空子・中空バルーン等を設けたものは、ローラ表面硬度が大きく、圧縮永久歪みが小さく、ベルト駆動ローラとして使用可能である。そして、加圧ローラ70は、不図示の駆動手段によって回転駆動し、定着ベルト30を走行しながら定着ニップを通過するシート22を搬送する。   The pressure roller 70 has three or more layers and is 20 to 80φ, which is a heat insulating roller. For example, a silicone rubber foam, a silicone layer having a hollow core, a hollow balloon or the like to increase the air content is used. A silicone layer provided with a hollow element, a hollow balloon or the like has a large roller surface hardness and a small compression set, and can be used as a belt driving roller. The pressure roller 70 is rotationally driven by a driving unit (not shown), and conveys the sheet 22 passing through the fixing nip while running on the fixing belt 30.

図示例では、加圧ローラ70の内部にも熱源71を備え、外周に加圧側温度検知部材72を備える。そして、加圧側温度検知部材72により、加圧ローラ70の一定以上の温度上昇を防止する。   In the illustrated example, a heat source 71 is also provided inside the pressure roller 70, and a pressure-side temperature detection member 72 is provided on the outer periphery. The pressure side temperature detection member 72 prevents the pressure roller 70 from rising above a certain level.

ところで、上述した例では、非回転のニップ形成部材50を用いたが、例えば図7に示すようにニップ形成部材50として回転ローラを用いてもよい。また、上述した例では、定着ベルト30をほぼ円筒状に張り渡したが、例えば図8に示すようにニップ形成部材50である回転ローラとベルトガイド部材40との間に間隔をあけて定着ベルト30を楕円状に掛け渡してもよい。   In the above-described example, the non-rotating nip forming member 50 is used. However, for example, a rotating roller may be used as the nip forming member 50 as shown in FIG. In the above-described example, the fixing belt 30 is stretched in a substantially cylindrical shape. For example, as shown in FIG. 8, the fixing belt 30 is spaced from the rotation roller that is the nip forming member 50 and the belt guide member 40. 30 may be stretched elliptically.

図9には、対向部材である加圧ローラ70の他例の縦断面を示す。
この図9から判るとおり、対向部材である加圧ローラ70は、例えば芯金74のまわりに断熱層75を設け、そのまわりに離型層76を設けるようにしてもよい。断熱層75は、例えば多孔質構造とする。
FIG. 9 shows a longitudinal section of another example of the pressure roller 70 which is a facing member.
As can be seen from FIG. 9, the pressure roller 70, which is a facing member, may be provided with a heat insulating layer 75 around the cored bar 74 and a release layer 76 around it. The heat insulating layer 75 has a porous structure, for example.

間接転写4連ダンデム方式のカラー電子写真画像形成装置の全体概略構成図である。1 is an overall schematic configuration diagram of a color electrophotographic image forming apparatus of an indirect transfer quadruple dandem system. その定着装置を軸方向から見て示す概略構成図である。FIG. 2 is a schematic configuration diagram illustrating the fixing device as viewed from an axial direction. (A)はその定着装置で用いる定着ベルトの部分拡大断面図、(B)は他例である定着ベルトの部分拡大断面図である。(A) is a partially enlarged sectional view of a fixing belt used in the fixing device, and (B) is a partially enlarged sectional view of a fixing belt as another example. (A)はその定着装置で用いるベルトガイド部材の側面図、(B)は部分平面図である。(A) is a side view of a belt guide member used in the fixing device, and (B) is a partial plan view. その定着装置で用いる定着ベルトの片側端部構成図である。FIG. 4 is a configuration diagram of one end of a fixing belt used in the fixing device. その定着装置における誘導加熱源からの磁力分布を示す図である。It is a figure which shows magnetic force distribution from the induction heating source in the fixing device. 他例の定着装置を軸方向から見て示す概略構成図である。FIG. 10 is a schematic configuration diagram illustrating another example of a fixing device as viewed in the axial direction. さらに他例の定着装置を軸方向から見て示す概略構成図である。FIG. 6 is a schematic configuration diagram illustrating another example of the fixing device as viewed in the axial direction. 対向部材である加圧ローラの他例の縦断面図である。It is a longitudinal cross-sectional view of the other example of the pressure roller which is an opposing member. 従来の定着装置を軸方向から見て示す概略構成図である。FIG. 10 is a schematic configuration diagram illustrating a conventional fixing device as viewed from an axial direction.

符号の説明Explanation of symbols

22 シート(記録媒体)
30 定着ベルト
40 ベルトガイド部材
43 温度検知部材
44 ベルトガイド面
45 切欠き孔
50 ニップ形成部材
53 耐熱弾性部材(弾性発泡体層)
60 ベルト搬送形状保持部材
66 誘導加熱源
67 制御手段
70 加圧ローラ(対向部材)
100 定着装置
22 sheet (recording medium)
DESCRIPTION OF SYMBOLS 30 Fixing belt 40 Belt guide member 43 Temperature detection member 44 Belt guide surface 45 Notch hole 50 Nip forming member 53 Heat resistant elastic member (elastic foam layer)
60 Belt conveying shape holding member 66 Induction heating source 67 Control means 70 Pressure roller (opposing member)
100 Fixing device

Claims (13)

誘導加熱源と、その誘導加熱源により誘導加熱する定着ベルトと、その定着ベルトとの間で定着ニップを形成する対向部材とを備え、前記定着ニップを通過する記録媒体上の画像を定着する定着装置において、
前記定着ベルトを挟んで前記誘導加熱源と対向する温度検知部材と、その温度検知部材の検知温度に基づき前記誘導加熱源を制御する制御手段とを備えることを特徴とする、定着装置。
A fixing device that includes an induction heating source, a fixing belt that is induction-heated by the induction heating source, and a counter member that forms a fixing nip with the fixing belt, and that fixes an image on a recording medium that passes through the fixing nip. In the device
A fixing device comprising: a temperature detection member facing the induction heating source with the fixing belt interposed therebetween; and a control unit that controls the induction heating source based on a temperature detected by the temperature detection member.
前記温度検知部材を、前記定着ベルトに接触して備えることを特徴とする、請求項1に記載の定着装置。   The fixing device according to claim 1, wherein the temperature detection member is provided in contact with the fixing belt. 前記定着ベルトを挟んで前記誘導加熱源と対向してベルトガイド部材を備え、そのベルトガイド部材で支持して前記温度検知部材を備えることを特徴とする、請求項1または2に記載の定着装置。   The fixing device according to claim 1, further comprising: a belt guide member facing the induction heating source with the fixing belt interposed therebetween, and the temperature detecting member supported by the belt guide member. . 前記ベルトガイド部材に切欠き孔をあけ、その切欠き孔を通して前記温度検知部材を前記誘導加熱源と対向することを特徴とする、請求項3に記載の定着装置。   The fixing device according to claim 3, wherein a notch hole is formed in the belt guide member, and the temperature detection member is opposed to the induction heating source through the notch hole. 前記ベルトガイド部材に、円弧状のベルトガイド面を設けることを特徴とする、請求項3または4に記載の定着装置。   The fixing device according to claim 3, wherein an arc-shaped belt guide surface is provided on the belt guide member. 前記ベルトガイド部材を、磁性を有する絶縁耐熱材料でつくることを特徴とする、請求項3ないし5のいずれか1に記載の定着装置。   The fixing device according to claim 3, wherein the belt guide member is made of an insulating heat-resistant material having magnetism. 前記ベルトガイド部材を、非磁性の絶縁耐熱材料でつくることを特徴とする、請求項3ないし5のいずれか1に記載の定着装置。   6. The fixing device according to claim 3, wherein the belt guide member is made of a nonmagnetic insulating heat resistant material. 前記定着ベルトを、薄肉低熱容量で、可撓性を有する無端ループ状とすることを特徴とする、請求項1ないし7のいずれか1に記載の定着装置。   8. The fixing device according to claim 1, wherein the fixing belt has an endless loop shape having a thin wall and a low heat capacity and having flexibility. 無端ループ状の前記定着ベルトの両側縁を案内して、前記定着ベルトの搬送形状を円筒状に保持するベルト搬送形状保持部材を備えることを特徴とする、請求項8に記載の定着装置。   The fixing device according to claim 8, further comprising a belt conveyance shape holding member that guides both side edges of the endless loop-shaped fixing belt and holds the conveyance shape of the fixing belt in a cylindrical shape. 前記定着ベルトに裏当てして前記対向部材との間で定着ニップを形成するニップ形成部材を備え、そのニップ形成部材が前記定着ベルトと接触する側を弾性発泡体層とすることを特徴とする、請求項1ないし9のいずれか1に記載の定着装置。   A nip forming member that forms a fixing nip with the facing member by backing the fixing belt is provided, and an elastic foam layer is formed on a side of the nip forming member that contacts the fixing belt. The fixing device according to any one of claims 1 to 9. 前記定着ベルトに裏当てして前記対向部材との間で定着ニップを形成するニップ形成部材を備え、そのニップ形成部材をローラ形状とすることを特徴とする、請求項1ないし9のいずれか1に記載の定着装置。   10. A nip forming member that forms a fixing nip with the opposing member by backing the fixing belt, and the nip forming member has a roller shape. The fixing device according to 1. 前記対向部材を断熱ローラとすることを特徴とする、請求項1ないし11のいずれか1に記載の定着装置。   The fixing device according to claim 1, wherein the facing member is a heat insulating roller. 請求項1ないし12のいずれか1に記載の定着装置を備えることを特徴とする、画像形成装置。   An image forming apparatus comprising the fixing device according to claim 1.
JP2003418842A 2003-12-17 2003-12-17 Fixing device and image forming apparatus Pending JP2005181464A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007078989A (en) * 2005-09-13 2007-03-29 Canon Inc Image heating apparatus
JP2009223044A (en) * 2008-03-17 2009-10-01 Fuji Xerox Co Ltd Fixing apparatus and image forming apparatus
JP2009300464A (en) * 2008-06-10 2009-12-24 Ricoh Co Ltd Fixing device and image forming apparatus
JP2010134389A (en) * 2008-12-08 2010-06-17 Oki Data Corp Fixing device and image forming device
JP2010145592A (en) * 2008-12-17 2010-07-01 Canon Inc Image heating device
US8761650B2 (en) 2010-11-12 2014-06-24 Ricoh Company, Ltd. Fixing device and image forming apparatus
JP2021004914A (en) * 2019-06-25 2021-01-14 株式会社リコー Fixing device and image forming apparatus

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007078989A (en) * 2005-09-13 2007-03-29 Canon Inc Image heating apparatus
JP2009223044A (en) * 2008-03-17 2009-10-01 Fuji Xerox Co Ltd Fixing apparatus and image forming apparatus
US7907870B2 (en) 2008-03-17 2011-03-15 Fuji Xerox Co., Ltd. Fixing apparatus and image forming apparatus
JP4655099B2 (en) * 2008-03-17 2011-03-23 富士ゼロックス株式会社 Fixing apparatus and image forming apparatus
JP2009300464A (en) * 2008-06-10 2009-12-24 Ricoh Co Ltd Fixing device and image forming apparatus
JP2010134389A (en) * 2008-12-08 2010-06-17 Oki Data Corp Fixing device and image forming device
JP2010145592A (en) * 2008-12-17 2010-07-01 Canon Inc Image heating device
US8761650B2 (en) 2010-11-12 2014-06-24 Ricoh Company, Ltd. Fixing device and image forming apparatus
JP2021004914A (en) * 2019-06-25 2021-01-14 株式会社リコー Fixing device and image forming apparatus
JP7238625B2 (en) 2019-06-25 2023-03-14 株式会社リコー Fixing device and image forming device

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