JP3527349B2 - Surface heating roller - Google Patents
Surface heating rollerInfo
- Publication number
- JP3527349B2 JP3527349B2 JP00928896A JP928896A JP3527349B2 JP 3527349 B2 JP3527349 B2 JP 3527349B2 JP 00928896 A JP00928896 A JP 00928896A JP 928896 A JP928896 A JP 928896A JP 3527349 B2 JP3527349 B2 JP 3527349B2
- Authority
- JP
- Japan
- Prior art keywords
- passing area
- heating roller
- surface heating
- substrate
- paper passing
- 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.)
- Expired - Fee Related
Links
Landscapes
- Fixing For Electrophotography (AREA)
Description
【０００１】本発明は、主として定着装置に係り、特
に、複写機、フアクシミリ、電子写真プリンタ等の画像
形成装置に用いられるトナー定着装置の加熱ローラに関
する。The present invention mainly relates to a fixing device, and more particularly to a heating roller of a toner fixing device used in an image forming apparatus such as a copying machine, facsimile machine, electrophotographic printer and the like.
【０００２】[0002]
【従来の技術】複写機やプリンタ等の電子写真方式によ
る画像形成装置では、一般に、記録紙に付着（転写）し
た現像剤（トナー）を加熱融解することで定着を行う加
熱ローラ定着方式が採用されている。この加熱ローラ定
着方式の代表的な構成は、内部にハロゲンランプを備え
た加熱ローラに加圧ローラを圧接配置し、加熱ローラと
加圧ローラのニップ部（相互圧接部）に転写紙を搬送し
てハロゲンランプの熱とローラ間の加圧力で転写紙上の
現像剤を溶融・定着させるようになっている。2. Description of the Related Art Generally, an electrophotographic image forming apparatus such as a copying machine or a printer adopts a heating roller fixing method in which a developer (toner) adhered (transferred) to a recording sheet is heated and melted to perform fixing. Has been done. The typical configuration of this heating roller fixing system is that a pressure roller is arranged in pressure contact with a heating roller equipped with a halogen lamp inside, and the transfer paper is conveyed to the nip portion (mutual pressure contact portion) between the heating roller and the pressure roller. The heat of the halogen lamp and the pressure between the rollers melt and fix the developer on the transfer paper.
【０００３】ところが、このようないわゆる輻射熱方式
の加熱構成では、加熱効率（熱伝導特性）が低いため、
加熱ローラが現像剤の溶融に必要な温度まで昇温するの
に数分の時間を要し、立ち上がり時間（ウォームアップ
時間）が長くなる。このため、操作開始後の速やかな記
録（コピー又はプリント）開始という快適な操作性ない
し使用性の向上を実現するためには、記録動作を行って
いない待機時においても熱源としてのハロゲンランプに
電力を供給し、加熱ローラを常時一定の温度に保ってお
く必要がある。しかしながら、このように熱源に常時電
力を供給する方式では、画像形成装置全体の消費電力に
対する待機時電力の占める割合が大きく、画像形成装置
の低消費電力化の妨げとなっている。However, in such a so-called radiant heat type heating structure, since the heating efficiency (heat conduction characteristic) is low,
It takes several minutes for the heating roller to heat up to the temperature required for melting the developer, and the rising time (warm-up time) becomes long. For this reason, in order to realize comfortable operability or usability such as prompt start of recording (copying or printing) after the start of operation, even if the recording operation is not performed, the halogen lamp as a heat source is powered by electricity. Must be supplied and the heating roller must be kept at a constant temperature at all times. However, in such a system in which the power is constantly supplied to the heat source, the standby power consumption occupies a large proportion of the power consumption of the entire image forming apparatus, which hinders reduction of the power consumption of the image forming apparatus.
【０００４】そこで、このような問題の解消を目的とし
て、金属やセラミックなどから成る筒状の基体の外表面
に発熱体パターンを印刷あるいは溶射等の手法により付
着させた、自己発熱型ともいうべき面発熱ローラが提案
されている。このような面発熱ローラを用いた場合、ロ
ーラ表面で熱が発生するので、その加熱効率が高まり、
立ち上がり時間の大幅な短縮が可能となる。しかしなが
ら、このような発熱ローラにおいても待機時間の電力供
給を回避するためには、その立ち上がりを速くしなけれ
ばならず、そのためには、基体の熱容量を小さくするこ
とが効果的であることが知られている。基体の熱容量を
小さくするには、その体積を小さくすればよく、また、
体積を小さくするためには、径を小さく、且つ、厚さを
薄くすればよい。Therefore, for the purpose of solving such a problem, it may be called a self-heating type in which a heating element pattern is attached to the outer surface of a cylindrical substrate made of metal or ceramic by printing or thermal spraying. Surface heating rollers have been proposed. When such a surface heating roller is used, heat is generated on the roller surface, so that the heating efficiency is increased,
The rise time can be greatly shortened. However, even in such a heat generating roller, in order to avoid power supply during the standby time, it is necessary to speed up the rising thereof, and for that purpose, it is known that reducing the heat capacity of the substrate is effective. Has been. The heat capacity of the substrate can be reduced by reducing its volume.
In order to reduce the volume, the diameter may be reduced and the thickness may be reduced.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、一般
に、転写紙にトナーを効率よく且つ確実に定着させるた
めには、面発熱ローラと加圧ローラとの間に十分なニッ
プを得るべく、面発熱ローラに対する加圧ローラの大き
な圧接力を必要とする。このため、上述のような方法に
より単純に基体の体積を小さくしただけの面発熱ローラ
では、機械的強度が小さく、加圧時における基体のひず
みやたわみ、あるいはこれに伴う破壊が生じ易い。従っ
て、従来における面発熱ローラでは、設定温度への立ち
上がり時間を短縮する手法は分かっていながらも、破壊
現象との関係で小径・薄肉化（小体積化）を思うように
図ることができず、立ち上がり時間の大幅な短縮には至
っていない。However, in general, in order to fix the toner efficiently and reliably on the transfer paper, in order to obtain a sufficient nip between the surface heating roller and the pressure roller, the surface heating roller is provided. A large pressure contact force of the pressure roller with respect to is required. For this reason, in the surface heating roller in which the volume of the substrate is simply reduced by the above-described method, the mechanical strength is low, and the strain or bending of the substrate at the time of pressurization or the accompanying breakdown is likely to occur. Therefore, in the conventional surface heating roller, although it is known that the rise time to the set temperature can be shortened, it is not possible to reduce the diameter and the wall thickness (reduce the volume) in consideration of the destruction phenomenon. The rise time has not been significantly shortened.
【０００６】本発明は、予熱（プレヒート）の必要がな
くて画像形成装置全体の消費電力を低減することができ
るとともに、破壊強度の大きい面発熱ローラの提供を、
その目的とする。The present invention provides a surface heating roller which can reduce the power consumption of the entire image forming apparatus without the need for preheating and has a large breaking strength.
To that end.
【０００７】[0007]
【課題を解決するための手段】本発明者らの破壊原因に
ついての考察によれば、図８に示すように、従来の単純
な円筒基体モデル５０に対して加圧ローラ５２で付勢手
段５３を介して荷重を加えた際（定着動作の際）、
（ｂ）に示すように、中央部に比べて開口端端部のひず
みが軸受部５４との関係で最大となる。（ａ）は無荷重
時の状態を示している。基体の材料として実用的観点か
ら採用されるガラスやセラミックでは、その材質特性上
又は取扱い特性上、製造過程において端部にチッピング
が生じ易いが、図９に示すように、端部に切れ目や割れ
目等のチッピング５６があると、図中波紋状に示すよう
に、チッピング５６部分に応力が集中し、クラック５８
を生じ易い。以上のことから、基体５０がガラスやセラ
ミック製の場合には特に破壊が起こり易い、という結論
が得られる。According to the present inventors' consideration of the cause of destruction, as shown in FIG. 8, a pressing roller 52 and a biasing means 53 are applied to a conventional simple cylindrical base model 50. When a load is applied through (when fixing operation),
As shown in (b), the strain at the opening end portion becomes maximum in relation to the bearing portion 54 as compared with the central portion. (A) shows the state when there is no load. With glass or ceramics used from a practical point of view as the material of the substrate, chipping is likely to occur at the end portion in the manufacturing process due to its material characteristics or handling characteristics, but as shown in FIG. If there are chippings 56 such as the one shown in FIG.
Is likely to occur. From the above, it can be concluded that when the substrate 50 is made of glass or ceramic, breakage is likely to occur.
【０００８】上記考察に基づいて、基体の端部のみを有
効に補強し、かかる裏付けの下、十分な小体積化を施し
て立ち上がり時間の大幅な短縮を図る、というのが本発
明の趣旨である。具体的には、請求項１記載の発明で
は、通紙領域より長寸で円筒状の基体と、該基体を含め
た全体厚み内に設けられる熱源とを一体に有する中空状
の面発熱ローラにおいて、前記基体の少なくとも一端側
における通紙領域の範囲外の部分に、該基体の通紙領域
内の肉厚より厚く形成され且つ該厚肉形成部分のローラ
軸方向幅が前記通紙領域内の肉厚より広い補強領域を前
記基体の外側に一体成形した、という構成を採ってい
る。Based on the above consideration, it is the gist of the present invention to effectively reinforce only the end portion of the base body and, under such backing, to sufficiently reduce the volume so as to significantly shorten the rising time. is there. Specifically, according to the first aspect of the invention , a cylindrical base that is longer than the paper passing area and the base is included.
Hollow shape integrally with a heat source provided within the entire thickness
Surface heating roller, at least one end side of the base body
In the area outside the paper passing area in
A roller that is formed thicker than the inner wall thickness of the inner wall
In front of the reinforced area, the axial width of which is wider than the thickness in the paper passing area.
The structure is such that it is integrally molded on the outside of the base .
【０００９】請求項２記載の発明では、通紙領域より長
寸で円筒状の基体と、該基体を含めた全体厚み内に設け
られる熱源とを一体に有する中空状の面発熱ローラにお
いて、前記基体の少なくとも一端側における通紙領域の
範囲外の部分に、該基体の通紙領域内の肉厚より厚く形
成され且つ該厚肉形成部分のローラ軸方向幅が前記通紙
領域内の肉厚より広い補強領域を前記基体の内側及び外
側に亘って一体成形した、という構成を採っている。請
求項３記載の発明では、通紙領域より長寸で円筒状の基
体と、該基体を含めた全体厚み内に設けられる熱源とを
一体に有する中空状の面発熱ローラにおいて、前記基体
の少なくとも一端側における通紙領域の範囲外の部分
に、該基体の通紙領域内の肉厚より厚く形成され且つ該
厚肉形成部分のローラ軸方向幅が前記通紙領域内の肉厚
より広い補強領域をその一部が前記熱源の下にも位置す
るように一体成形した、という構成を採っている。請求
項４記載の発明では、通紙領域より長寸で円筒状の基体
と、該基体を含めた全体厚み内に設けられる熱源とを一
体に有する中空状の面発熱ローラにおいて、前記基体の
少なくとも一端側における通紙領域の範囲外の部分に、
該基体の通紙領域内の肉厚より厚く形成され且つ該厚肉
形成部分のローラ軸方向幅が前記通紙領域内の肉厚より
広い補強領域を端部に向かって肉厚が増えていくテーパ
状に一体成形した、という構成を採っている。請求項５
記載の発明では、通紙領域より長寸で円筒状の基体と、
該基体を含めた全体厚み内に設けられる熱源とを一体に
有する中空状の面発熱ローラにおいて、前記基体の少な
くとも一端側における通紙領域の範囲外の部分に、該基
体の通紙領域内の肉厚より厚く形成され且つ該厚肉形成
部分のローラ軸方向幅が前記通紙領域内の肉厚より広い
補強領域を前記基体の中空を塞ぐ壁として一体成形し、
該壁はつっかい棒的補助片を有している、という構成を
採っている。請求項６記載の発明では、請求項１乃至５
のうちの何れか１つに記載の構成において、補強を効率
的に行うべく、前記補強領域は、前記補強領域の少なく
とも一部がローラを支持する軸受部と相互に重なり合う
位置にある、という構成を採っている。請求項７記載の
発明では、面発熱ローラと、該面発熱ローラに対向して
配置される加圧ローラを有する定着装置において、前記
面発熱ローラが、請求項１乃至６のうちの何れか１つに
記載の面発熱ローラである、という構成を採っている。
請求項８記載の発明では、記録材上にトナー画像を転写
し、該トナー画像を有する記録材を定着装置に通して定
着を行う画像形成装置において、前記定着装置が、請求
項７記載の定着装置である、という構成を採っている。 According to the second aspect of the invention, the length is longer than the paper passing area.
Provided within the overall size of the cylindrical base and the base including the base
To a hollow surface heating roller that has an integrated heat source
The paper passage area on at least one end side of the substrate.
In the portion outside the range, a shape thicker than the wall thickness in the paper passing area of the substrate is formed.
And the width in the roller axial direction of the thick portion
A reinforced area wider than the wall thickness in the area is provided inside and outside the substrate.
The structure is such that it is integrally molded over the sides . In the invention according to claim 3 , the cylindrical base is longer than the paper passing area.
The body and the heat source provided within the entire thickness including the base
A hollow surface-heating roller integrally provided with the base
Outside at least one end of the paper passing area
Is formed thicker than the wall thickness of the substrate in the paper passing area, and
The width of the thick-walled portion in the roller axis direction is the wall thickness in the paper passing area.
A larger reinforced area, part of which is also located under the heat source
It is integrally molded like this. In the invention according to claim 4 , the cylindrical substrate is longer than the sheet passing area.
And a heat source provided within the entire thickness including the substrate.
In a hollow surface heating roller having a body,
At least in the part outside the paper passing area on one end side,
Is formed thicker than the thickness in the paper passing area of the substrate and
The width of the forming portion in the roller axis direction is smaller than the thickness in the paper passing area.
A taper in which the wall thickness increases in a wide reinforced area toward the end
It has a structure that it is integrally molded into a shape. Claim 5
In the described invention, a cylindrical substrate having a length longer than the paper passing area,
Integrate with the heat source provided within the entire thickness including the base
In a hollow surface heating roller having,
At least at one end side, in the portion outside the paper passing area, the base
Formed thicker than the wall thickness in the paper passing area of the body and forming the thick wall
The roller axial width of the part is wider than the wall thickness in the paper passing area.
The reinforcing region is integrally formed as a wall that closes the hollow of the base body,
The wall has a big rod-like auxiliary piece.
I am collecting. In the invention described in claim 6, claims 1 to 5
Reinforcement efficiency in the configuration according to any one of
The reinforcement area is smaller than the reinforcement area.
Partly overlaps the bearing part that supports the roller.
It is in the position. Claim 7
In the invention, the surface heating roller and the surface heating roller are provided so as to face each other.
In a fixing device having a pressure roller arranged,
A surface heating roller according to any one of claims 1 to 6.
The surface heating roller described above is used.
In the invention according to claim 8, the toner image is transferred onto the recording material.
Then, the recording material having the toner image is passed through a fixing device and fixed.
In the image forming apparatus for fixing, the fixing device is
The fixing device according to item 7 is adopted.
【００１０】[0010]
【実施例】まず、本発明の第１の参考例（トナー定着装
置への適用例）を図１及び図２に基づいて説明する。ト
ナー定着装置２は、面発熱ローラ４と、この面発熱ロー
ラ４に対向して配置された加圧ローラ６とから概略構成
されており、加圧ローラ６はバネ等の付勢手段８，８に
よって面発熱ローラ４に対して圧接されている。トナー
画像を有する被加熱材を面発熱ローラ４と加圧ローラ６
との間に通すことによって定着がなされる。面発熱ロー
ラ４は、最大通紙領域Ｗより長寸で円筒状の基体１０
と、この基体１０の表面に形成された発熱抵抗体１２
と、図示しない最表面の離型層とから構成されており、
最大通紙領域Ｗの範囲外の部分（端部）を軸受部材１
４，１４で回転自在に支持されている。 First , a first reference example of the present invention (application example to a toner fixing device) will be described with reference to FIGS. The toner fixing device 2 is roughly composed of a surface heating roller 4 and a pressure roller 6 arranged so as to face the surface heating roller 4, and the pressure roller 6 is a biasing means 8, 8 such as a spring. Is pressed against the surface heating roller 4. The material to be heated having the toner image is applied to the surface heating roller 4 and the pressure roller 6.
It is fixed by passing it between and. The surface heating roller 4 has a cylindrical base 10 that is longer than the maximum paper passing area W.
And the heating resistor 12 formed on the surface of the base body 10.
And a release layer on the outermost surface (not shown),
The part (end) outside the maximum paper passing area W is the bearing member 1
It is rotatably supported by 4, 4.
【００１１】基体１０は、アルミニウム（Ａｌ）、鉄
（Ｆｅ）あるいはこれらの合金などの金属に、セラミッ
ク層、耐熱高分子層、アルマイトなどの酸化膜等の絶縁
層を形成したもの、もしくは、セラミック、ガラス、耐
熱プラスチックなどの絶縁体である。発熱抵抗体１２
は、セラミック発熱体、ニクロム、Ｔａ2Ｎ、ＲｕＯ
2 、Ａｇ／Ｐｄ等の発熱抵抗を基体１０の表面に溶射、
塗布、印刷などの手法で面状もしくは線状に形成される
ものである。この発熱抵抗体１２に通電することで面発
熱ローラ４が発熱するようになっている。なお、発熱セ
ラミックスを筒状に形成するなど、発熱抵抗体をそのま
ま基体１０として使用し、通電して発熱させる構成とす
ることもできる。図示しない離型層は、ＰＦＡ、ＰＴＦ
Ａ等の材料で形成されるものである。The base 10 is made of a metal such as aluminum (Al), iron (Fe), or an alloy thereof, and a ceramic layer, a heat-resistant polymer layer, an insulating layer such as an oxide film such as alumite, or ceramic. Insulators such as glass and heat-resistant plastic. Heating resistor 12
Is a ceramic heating element, nichrome, Ta 2 N, RuO
2 , spraying a heating resistor such as Ag / Pd on the surface of the substrate 10,
It is formed in a planar shape or a linear shape by a method such as coating or printing. When the heating resistor 12 is energized, the surface heating roller 4 generates heat. It is also possible to use a heating resistor as it is as the substrate 10 such as by forming the heating ceramics in a cylindrical shape, and generate heat by energizing. The release layer not shown is PFA, PTF
It is formed of a material such as A.
【００１２】基体１０の両端部における最大通紙領域Ｗ
の範囲外の部分には、補強部としての軸受部材１４の位
置に対応して補強領域１６が形成されている。この補強
領域１６は、図２からも明らかなように、最大通紙領域
Ｗ内の肉厚ｔ１ よりも大きい肉厚ｔ２ を有し、且つ、
肉厚ｔ１ よりも広い幅Ｌを有するリング状に一体成形
されている。また、この第１の参考例では、補強領域１
６の幅Ｌは軸受部材１４の幅Ｇよりも若干広く設定され
ている。The maximum paper passing area W at both ends of the substrate 10
A reinforcing region 16 is formed in a portion outside the range of (1) in correspondence with the position of the bearing member 14 as a reinforcing portion. As is clear from FIG. 2, the reinforcing region 16 has a wall thickness t2 larger than the wall thickness t1 in the maximum paper passing region W, and
That is integrally formed in a ring shape having a width L than the thickness t1. In addition, in the first reference example , the reinforcement region 1
The width L of 6 is set to be slightly wider than the width G of the bearing member 14.
【００１３】上記構成の下、以下に示すようなＡ３記録
紙用の定着装置のモデルを作製し、大きな荷重を加えて
基体１０の破壊強度を測定した。
・基体１０の材料：パイレックスガラス
・基体１０の外径Ｄ：３０ｍｍ
・基体１０の肉厚ｔ1 ：０．５ｍｍ
・最大通紙領域Ｗ：３０５ｍｍ
・軸受部材１４間の距離Ｍ：３３０ｍｍ
・補強領域１６の肉厚ｔ2 ：１０ｍｍ
なお、補強領域１６は、リング状に形成した別部品を後
加工でパイプ内に挿入し、形成した。比較のため、全領
域に亘って均一な厚さを持つガラスパイプ（他の条件は
上記に同じ）の破壊強度の測定も行った。その結果、半
数以上の試料が壊れずに残った荷重は以下の通りであ
る。
・補強領域無し：５５ｋｇｆ
・補強領域有り：７５ｋｇｆ
この実験事実により、本発明に係る基体１０の破壊強度
が約５０％も向上することが判る。ガラスのヒビの走る
方向、高速度カメラの撮影による観察などから、基体の
破壊は筒端部から起きているものが多いが、上記のよう
に、補強領域１６の存在による端部近傍の補強によっ
て、基体１０自体の強度を向上させることができる。Under the above construction, a model of a fixing device for A3 recording paper as shown below was prepared, and a large load was applied to measure the breaking strength of the substrate 10. Of-the substrate 10 material: the outer diameter of the Pyrex glass substrate 10 D: thickness of 30 mm, the base body 10 t 1: 0.5 mm, maximum paper feed area W: distance between 305 mm-bearing member 14 M: 330 mm, the reinforcing region Thickness t 2 of 16: 10 mm The reinforcing region 16 was formed by inserting another component formed in a ring shape into the pipe by post-processing. For comparison, the breaking strength of a glass pipe having a uniform thickness over the entire region (other conditions are the same as above) was also measured. As a result, the loads where more than half of the samples remained without being broken are as follows. -Without reinforced area: 55 kgf-With reinforced area: 75 kgf These experimental facts show that the breaking strength of the substrate 10 according to the present invention is improved by about 50%. From the direction in which the glass cracks and the observation by high-speed camera photography, the base body often breaks from the end of the cylinder. As described above, the presence of the reinforcing region 16 reinforces the vicinity of the end. The strength of the base 10 itself can be improved.
【００１４】図３は、本発明の一実施例における補強領
域１６の各例を示すものである。但し、（ｃ）は参考例
である。定着装置の基本構成は上記第１の参考例と同様
である。（ａ）は、補強領域１６を基体１０の外側に一
体成形した場合、（ｂ）は、補強領域１６を基体１０の
内側及び外側に亘って一体成形した場合、（ｃ）は、補
強領域１６を壁として一体成形し、円筒つぶれ方向剛性
を高めた場合、（ｄ）は、補強領域１６を発熱抵抗体１
２の下にも一部形成した場合、（ｅ）は、補強領域１６
にテーパを付けた場合、（ｆ）は、さらに（ｃ）の変形
で補強領域１６がつっかい棒的補助片１６ａを有する場
合を示している。テーパを有する（ｅ）の場合は、肉厚
が少しづつ変化するのであるが、局部的に応力が集中せ
ず、基体１０の歪み量が面発熱ローラ４の中央近傍と外
側とで均一となるように、端部に向かって肉厚が増えて
いく方が好ましい。補助片１６ａを有する（ｆ）の場合
は、上記第１の参考例のように肉厚領域の周方向で均一
な肉厚を持たなくても良い。FIG. 3 shows a reinforcing region in one embodiment of the present invention .
It shows each example of the area 16 . However, (c) is a reference example
Is. The basic structure of the fixing device is the same as that of the first reference example.
Is. (A) shows the case where the reinforcement region 16 is integrally formed on the outside of the base body 10, (b) shows the case where the reinforcement region 16 is formed integrally on the inside and outside of the base body 10, and (c) shows the reinforcement region 16. Is integrally molded as a wall to increase the rigidity in the direction of collapse of the cylinder, (d) shows the reinforcing region 16 in the heating resistor 1
When a part is formed below 2, the reinforcing region 16 is (e).
6F shows a case in which the reinforcing region 16 has a stiff rod-like auxiliary piece 16a due to the deformation of (c). In the case of the taper (e), the wall thickness changes little by little, but the stress is not locally concentrated and the strain amount of the substrate 10 becomes uniform in the vicinity of the center of the surface heating roller 4 and on the outside. Thus, it is preferable that the thickness increases toward the end. In the case of (f) having the auxiliary piece 16a, it is not necessary to have a uniform wall thickness in the circumferential direction of the wall thickness region as in the first reference example .
【００１５】図４は、第２の参考例における補強領域１
６の各例を示すもので、基体１０の終端に位置するもの
である。
（ａ）は、リング状に形成した場合、
（ｂ）は閉塞壁として形成した場合を示している。
（ｂ）の場合は、ひずみに対する剛性が高められる。FIG. 4 is a reinforcement region 1 in the second reference example.
6 shows each example , and is located at the end of the base 10. (A) shows the case where it is formed in a ring shape, and (b) shows the case where it is formed as a closed wall.
In the case of (b), the rigidity against strain is increased.
【００１６】図５は、第３の参考例における補強領域１
６の各例を示すもので、第１の実施例が基体１０に一体
成形したものであるのに対し、別部品として形成された
補強部材を基体１０と組み合わせて形成したものであ
る。
（ａ）は、リング状の補強部材１８を基体１０の内側に
設置した場合、
（ｂ）は、リング状の補強部材２０を基体１０の外側に
設置した場合、
（ｃ）は、円盤状の補強部材２２で閉塞した場合、
（ｄ）は、補助片２４ａを有する円盤状の補強部材２２
で閉塞した場合、
（ｅ）は、段差を有するリング状の補強部材２６を基体
１０の端部に突き合わせて一部を外方に突出させた場
合、
（ｆ）は、両側に異径の段差を有するリング状の補強部
材２８を基体１０の端部に突き合わせて一部を外方に突
出させた場合を示している。FIG. 5 shows a reinforcing region 1 in the third reference example.
6 shows each example , the first embodiment is integrally formed with the base body 10, whereas the reinforcing member formed as a separate component is formed in combination with the base body 10. (A) shows the case where the ring-shaped reinforcing member 18 is installed inside the base body 10, (b) shows the case where the ring-shaped reinforcing member 20 is installed outside the base body 10, and (c) shows the disk-like form. When closed with the reinforcing member 22, (d) shows a disk-shaped reinforcing member 22 having an auxiliary piece 24a.
(E) is a ring-shaped reinforcing member 26 having a step butted to the end of the base 10 and a part thereof is projected outward. (F) is a step having different diameters on both sides. A case is shown in which a ring-shaped reinforcing member 28 having is abutted on the end of the base 10 and a part thereof is projected outward.
【００１７】これらの補強部材は、鉄（Ｆｅ）、アルミ
ニウム（Ａｌ）、銅（Ｃｕ）等の金属及びこれらの合
金、もしくはフェノール、ポリイミド、液晶ポリマーな
どの耐熱性の樹脂、あるいは、セラミック、ガラスなど
から構成されるものであるが、熱膨張率の違いによる破
壊を防ぐため、基体１０とほぼ同一の熱膨張率を持つも
のが望ましい。基体１０の素材をガラスとすると、補強
領域１６を一体成形するには端部を溶融する必要があ
り、このときの加工の精度がでにくく、コストもかかっ
てしまう。これに対し、別部品とした場合には、補強領
域１６を精度良く且つ安価に形成きるメリットがある。These reinforcing members include metals such as iron (Fe), aluminum (Al) and copper (Cu) and alloys thereof, or heat resistant resins such as phenol, polyimide and liquid crystal polymer, or ceramics and glass. However, in order to prevent destruction due to a difference in thermal expansion coefficient, it is desirable that the thermal expansion coefficient is substantially the same as that of the base 10. If the material of the base body 10 is glass, it is necessary to melt the end portions in order to integrally form the reinforcing region 16, which makes it difficult to perform the processing at this time, and the cost also increases. On the other hand, when it is formed as a separate component, there is a merit that the reinforcing region 16 can be formed accurately and inexpensively.
【００１８】図６は第４の参考例における補強領域１６
を示すものである。補強部材３０は、段差を有するリン
グ状の本体部３２と、これとは材質が異なるリング状の
補助部３４とから構成されており、基体１０の端部に突
き合わせて組み合わされている。本体部３２は、熱膨張
率の違いによる破壊を防ぐため、基体１０と同一ないし
同質の材料で形成されており、接着する際にはほぼ同一
の熱膨張係数をもつ接着剤で行うことが望ましい。ここ
では、補強部材３０の一部分が基体１０と同一ないし同
質の材料を有する例を示したが、無論、補強部材３０全
体が基体１０と同一ないし同質の材料で形成されていて
もよい。ところで、面発熱ローラの基体は、トナーを定
着する際には約２００度の温度になることがある。物質
の線膨張係数はガラスで約３．０［１０-６／ｄｅ
ｇ］、耐熱樹脂の例としては約９０［１０-６／ｄｅ
ｇ］等があり、これらの材料でφ３０のサイズで２００
度の温度上昇が発生した際には、径の変化がガラスで約
０．０２ｍｍ，耐熱樹脂は０．５４ｍｍの変化となる。
このように、基体材料と補強部材の材料の熱膨張率が大
きく異なる場合、基体が破壊される。従って、補強部材
の材料を基体の材料と同一ないし同質とすることにより
（一部分を含む）、線膨張係数の違いによる破壊を未然
に防ぐことができる。FIG. 6 shows a reinforcing region 16 in the fourth reference example.
Is shown. The reinforcing member 30 includes a ring-shaped main body portion 32 having a step and a ring-shaped auxiliary portion 34 made of a material different from that of the ring-shaped main body portion 32, and is butt-assembled with the end portion of the base body 10. The main body 32 is formed of the same or the same material as the base 10 in order to prevent the destruction due to the difference in the coefficient of thermal expansion, and it is preferable that the main body 32 is bonded with an adhesive having a substantially same coefficient of thermal expansion. . Here, an example is shown in which a part of the reinforcing member 30 has the same or the same material as the base body 10, but it goes without saying that the entire reinforcing member 30 may be made of the same or the same material as the base body 10. By the way, the substrate of the surface heating roller may reach a temperature of about 200 degrees when fixing the toner. The linear expansion coefficient of the material is about 3.0 [10-6 / de for glass.
g], as an example of a heat-resistant resin, about 90 [10 −6 / de
g] etc., and with these materials, the size of φ30 is 200
When a temperature rise occurs, the change in diameter is about 0.02 mm for glass and the change for heat resistant resin is 0.54 mm.
As described above, when the coefficient of thermal expansion of the base material and the material of the reinforcing member are significantly different, the base is destroyed. Therefore, by making the material of the reinforcing member the same as or the same as the material of the base (including a part), it is possible to prevent damage due to the difference in linear expansion coefficient.
【００１９】図７は、第５の参考例における補強領域１
６の各例を示すもので、補強領域１６と軸受部材１４と
が相互に重なり合う位置にあるのを特徴とする。
（ａ）は、段差を有するリング状の補強部材３６で形成
された補強領域１６内に軸受部材１４が完全に入り込む
場合、
（ｂ）は、段差を有するリング状の補強部材３８で形成
された補強領域１６内に軸受部材１４が一部重なる場
合、
（ｃ）は、段差を有するリング状の補強部材４０で形成
された補強領域１６内に軸受部材１４が基体１０の端部
を外れて完全に入り込む場合、
（ｄ）は、基体１０の外側に設置されたリング状の補強
部材４２上に軸受部材１４が重なる場合を示している。
上記実施例においても本参考例と同様に実施することが
できる。 FIG. 7 shows a reinforcing region 1 in the fifth reference example.
6 shows each example, and is characterized in that the reinforcing region 16 and the bearing member 14 are located at positions where they overlap each other. (A) is a case where the bearing member 14 completely enters the reinforcing region 16 formed by the ring-shaped reinforcing member 36 having steps, and (b) is formed by the ring-shaped reinforcing member 38 having steps. When the bearing member 14 partially overlaps the reinforcing region 16, (c) shows that the bearing member 14 is completely removed from the end portion of the base body 10 in the reinforcing region 16 formed by the ring-shaped reinforcing member 40 having a step. When entering, (d) shows the case where the bearing member 14 overlaps with the ring-shaped reinforcing member 42 installed outside the base 10.
Also in the above embodiment, it can be carried out in the same manner as this reference example.
it can.
【００２０】補強領域１６を軸受部材１４と重ならない
位置に形成し、実施例１と同様に以下に示すようなＡ３
記録紙用の定着装置のモデルを作製し、大きな荷重を加
えて基体１０の破壊強度を測定した。
・基体１０の材料：パイレックスガラス
・基体１０の外径Ｄ：３０ｍｍ
・基体１０の肉厚ｔ1 ：０．５ｍｍ
・最大通紙領域Ｗ：３０５ｍｍ
・軸受部材１４間の距離Ｍ：３３０ｍｍ
・補強領域１６の肉厚ｔ2 ：１０ｍｍ
その結果、半数以上の試料が壊れずに残った荷重は以下
の通りである。
・補強領域が軸受部材と重ならない：６２ｋｇｆ
・補強領域が軸受部材と重なる：７５ｋｇｆ
この実験事実により、補強領域１６を軸受部材１４とが
重なりあう構成の方が基体１０の破壊強度が向上するこ
とが判る。The reinforcing region 16 is formed at a position where it does not overlap with the bearing member 14, and as in the first embodiment, the following A3 is used.
A model of a fixing device for recording paper was prepared, and a large load was applied to measure the breaking strength of the substrate 10. Of-the substrate 10 material: the outer diameter of the Pyrex glass substrate 10 D: thickness of 30 mm, the base body 10 t 1: 0.5 mm, maximum paper feed area W: distance between 305 mm-bearing member 14 M: 330 mm, the reinforcing region The thickness t 2 of 16: 10 mm As a result, the loads where more than half of the samples remained without being broken are as follows. -Reinforcement region does not overlap with the bearing member: 62 kgf-Reinforcement region overlaps with the bearing member: 75 kgf According to this experimental fact, the structure in which the reinforcement region 16 overlaps with the bearing member 14 improves the breaking strength of the base body 10. I understand.
【００２１】ガラス製の基体は金属のものと比較して熱
容量を小さくできるので、昇温時間が早く、コスト的に
も非常に安いという点で実用的利用価値が大きいが、強
度の点で問題がある。基体材料をガラスとし、通紙サイ
ズをＡ３にして所望の昇温時間を得るためにはガラスの
肉厚は１ｍｍ以下が必要となる。上記本発明に係る補強
構成とした場合、セラミック等の脆性材料からなる基
体、特にガラスに対する強度が向上するために、実際の
定着動作に耐え得る１ｍｍ以下の肉厚のガラス基体を実
現できる。Since a glass substrate can have a smaller heat capacity than a metal substrate, it has great practical utility in that the temperature rising time is fast and the cost is very low, but it is problematic in strength. There is. In order to obtain a desired temperature rising time by setting the substrate material to be glass and the paper passing size to be A3, the thickness of the glass needs to be 1 mm or less. In the case of the reinforcing structure according to the present invention, the strength of the substrate made of brittle material such as ceramics, particularly glass, is improved, so that it is possible to realize a glass substrate having a wall thickness of 1 mm or less that can withstand the actual fixing operation.
【００２２】[0022]
【発明の効果】以上説明したように、請求項１記載の発
明によれば、基体における通紙領域の範囲外の端部の外
側に補強領域を一体成形する構成としたので、破壊発生
の発端となり易い端部に最大ひずみが現れることを防止
でき、破壊強度の向上を図ることができる。また、これ
によって通紙領域内での小体積化を図ることができ、設
定温度への立ち上がり時間の短縮、ひいては予熱（プレ
ヒート）の不要による画像形成装置全体の消費電力の低
減を図ることができる。As described above, according to the first aspect of the invention, the outside of the end portion of the substrate outside the paper passing area is covered.
Since the reinforcing region is integrally molded on the side , it is possible to prevent the maximum strain from appearing at the end portion, which is likely to be the starting point of fracture occurrence, and to improve the fracture strength. Further, by doing so, it is possible to reduce the volume in the paper passing area, shorten the rise time to the set temperature, and eventually reduce the power consumption of the entire image forming apparatus by eliminating the need for preheating. .
【００２３】[0023]
【００２４】[0024]
【００２５】[0025]
【００２６】請求項６記載の発明によれば、補強領域の
少なくとも一部が軸受部材と位置的に重なる構成とした
ので、面発熱ローラの強度の高い部分で荷重を受けるこ
とになり、よって破壊強度の向上がなされて高速機への
対応も可能となる。According to the invention described in claim 6 , since at least a part of the reinforced region overlaps with the bearing member in position, a load is applied to a high-strength portion of the surface heating roller, so that the destruction occurs. The strength has been improved, making it possible to support high-speed machines.
【図１】本発明の第１の参考例を示す定着装置での使用
状態の概要縦断面図である。FIG. 1 is a schematic vertical cross-sectional view of a use state in a fixing device showing a first reference example of the present invention.
【図２】基体の要部斜視図である。FIG. 2 is a perspective view of a main part of a base body.
【図３】一実施例における補強領域の各例を示す断面斜
視図である。FIG. 3 is a cross-sectional perspective view showing each example of a reinforced region in one embodiment .
【図４】第２の参考例における補強領域の各例を示す断
面斜視図である。FIG. 4 is a sectional perspective view showing each example of a reinforced region in a second reference example .
【図５】第３の参考例における補強領域の各例を示す断
面斜視図である。FIG. 5 is a sectional perspective view showing each example of a reinforcing region in a third reference example .
【図６】第４の参考例における補強領域の各例を示す断
面斜視図である。FIG. 6 is a cross-sectional perspective view showing each example of a reinforcing region in a fourth reference example .
【図７】第５の参考例における補強領域の各例を示す断
面斜視図である。FIG. 7 is a sectional perspective view showing each example of a reinforcing region in a fifth reference example .
【図８】従来モデルによる加圧時のひずみを示す概要断
面図である。FIG. 8 is a schematic cross-sectional view showing strain at the time of pressurization by a conventional model.
【図９】基体にチッピングがある場合のひび割れ発生の
状態を示す図である。FIG. 9 is a diagram showing a state in which cracking occurs when the substrate has chipping.
１０ 基体 １４ 軸受部材 １６ 補強領域 ｔ１ 通紙領域内の肉厚 10 Base 14 Bearing member 16 Reinforcement area t1 Wall thickness in the paper passing area
───────────────────────────────────────────────────── フロントページの続き (72)発明者 安達 真一 東京都大田区中馬込１丁目３番６号・株 式会社リコー内 (72)発明者 鈴木 由美子 東京都大田区中馬込１丁目３番６号・株 式会社リコー内 (56)参考文献 特開 平５−303301（ＪＰ，Ａ) 特開 平６−308847（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G03G 13/20 G03G 15/20 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Shinichi Adachi 1-3-6 Nakamagome, Ota-ku, Tokyo, Ricoh Co., Ltd. (72) Yumiko Suzuki 1-3-6 Nakamagome, Ota-ku, Tokyo No./Inside the stock company Ricoh (56) Reference JP-A-5-303301 (JP, A) JP-A-6-308847 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) G03G 13/20 G03G 15/20
Claims (8)
体を含めた全体厚み内に設けられる熱源とを一体に有す
る中空状の面発熱ローラにおいて、 前記基体の少なくとも一端側における通紙領域の範囲外
の部分に、該基体の通紙領域内の肉厚より厚く形成され
且つ該厚肉形成部分のローラ軸方向幅が前記通紙領域内
の肉厚より広い補強領域を前記基体の外側に一体成形し
たことを特徴とする面発熱ローラ。1. A cylindrical substrate, which is longer than the paper passing area, and the substrate.
In a hollow surface heating roller integrally having a heat source provided within the entire thickness including the body, in a portion outside the paper passing area on at least one end side of the base body, the meat in the paper passing area of the base body A reinforcing region formed thicker than the thickness and having a width in the roller axial direction of the thick-walled portion wider than the wall thickness in the sheet passing region is integrally formed on the outside of the base body.
A surface heating roller characterized in that
体を含めた全体厚み内に設けられる熱源とを一体に有す
る中空状の面発熱ローラにおいて、 前記基体の少なくとも一端側における通紙領域の範囲外
の部分に、該基体の通紙領域内の肉厚より厚く形成され
且つ該厚肉形成部分のローラ軸方向幅が前記通紙領域内
の肉厚より広い補強領域を前記基体の内側及び外側に亘
って一体成形したことを特徴とする 面発熱ローラ。2. A cylindrical substrate, which is longer than the sheet passing area, and the substrate.
Has a heat source that is integrated within the entire thickness of the body
In a hollow surface heating roller that is outside the range of the paper passing area on at least one end of the base
Is formed thicker than the wall thickness in the paper passing area of the substrate.
In addition, the width of the thick-walled portion in the roller axial direction is within the sheet passing area.
A reinforcement area wider than the wall thickness of the
A surface heating roller characterized by being integrally molded .
体を含めた全体厚み内に設けられる熱源とを一体に有す
る中空状の面発熱ローラにおいて、 前記基体の少なくとも一端側における通紙領域の範囲外
の部分に、該基体の通紙領域内の肉厚より厚く形成され
且つ該厚肉形成部分のローラ軸方向幅が前記通紙領域内
の肉厚より広い補強領域をその一部が前記熱源の下にも
位置するように一体成形したことを特徴とする 面発熱ロ
ーラ。3. A cylindrical substrate, which is longer than the sheet passing area, and the substrate.
Has a heat source that is integrated within the entire thickness of the body
In a hollow surface heating roller that is outside the range of the paper passing area on at least one end of the base
Is formed thicker than the wall thickness in the paper passing area of the substrate.
In addition, the width of the thick-walled portion in the roller axial direction is within the sheet passing area.
A reinforcement area wider than the wall thickness of
A surface heating roller characterized by being integrally molded so as to be positioned .
体を含めた全体厚み内に設けられる熱源とを一体に有す
る中空状の面発熱ローラにおいて、 前記基体の少なくとも一端側における通紙領域の範囲外
の部分に、該基体の通紙領域内の肉厚より厚く形成され
且つ該厚肉形成部分のローラ軸方向幅が前記通紙領域内
の肉厚より広い補強領域を端部に向かって肉厚が増えて
いくテーパ状に一体成形したことを特徴とする 面発熱ロ
ーラ。4. A cylindrical substrate, which is longer than the sheet passing area, and the substrate.
Has a heat source that is integrated within the entire thickness of the body
In a hollow surface heating roller that is outside the range of the paper passing area on at least one end of the base
Is formed thicker than the wall thickness in the paper passing area of the substrate.
In addition, the width of the thick-walled portion in the roller axial direction is within the sheet passing area.
The reinforced area wider than the thickness of the
A surface heating roller characterized by being integrally molded into a tapered shape .
体を含めた全体厚み内に設けられる熱源とを一体に有す
る中空状の面発熱ローラにおいて、 前記基体の少なくとも一端側における通紙領域の範囲外
の部分に、該基体の通紙領域内の肉厚より厚く形成され
且つ該厚肉形成部分のローラ軸方向幅が前記通紙領域内
の肉厚より広い補強領域を前記基体の中空を塞ぐ壁とし
て一体成形し、該壁はつっかい棒的補助片を有している
ことを特徴とする 面発熱ローラ。5. A cylindrical substrate, which is longer than the paper passing area, and the substrate.
Has a heat source that is integrated within the entire thickness of the body
In a hollow surface heating roller that is outside the range of the paper passing area on at least one end of the base
Is formed thicker than the wall thickness in the paper passing area of the substrate.
In addition, the width of the thick-walled portion in the roller axial direction is within the sheet passing area.
A reinforcing region wider than the wall thickness of the
Formed integrally with the wall, and the wall has a bulky rod-like auxiliary piece
A surface heating roller characterized in that
も一部がローラを支持する軸受部と相互に重なり合う位
置にあることを特徴とする請求項１乃至５のうちの何れ
か１つに記載の面発熱ローラ。 6. The reinforced region comprises at least the reinforced region.
Partly overlaps with the bearing part that supports the roller.
6. Any one of claims 1 to 5 characterized in that
The surface heating roller as described in item 1.
て配置される加圧ローラを有する定着装置において、 前記面発熱ローラが、請求項１乃至６のうちの何れか１
つに記載の面発熱ローラであることを特徴とする定着装
置。 7. A surface heating roller and a surface heating roller facing the surface heating roller.
In a fixing device having a pressure roller arranged as a unit, the surface heating roller is any one of claims 1 to 6.
Fixing device, characterized in that
Place
画像を有する記録材を定着装置に通して定着を行う画像
形成装置において、 前記定着装置が、請求項７記載の定着装置であることを
特徴とする画像形成装置。 8. A toner image is transferred onto a recording material, and the toner is transferred.
An image in which a recording material having an image is passed through a fixing device to be fixed
In the forming apparatus, the fixing device is the fixing device according to claim 7.
A characteristic image forming apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00928896A JP3527349B2 (en) | 1996-01-23 | 1996-01-23 | Surface heating roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00928896A JP3527349B2 (en) | 1996-01-23 | 1996-01-23 | Surface heating roller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09197871A JPH09197871A (en) | 1997-07-31 |
| JP3527349B2 true JP3527349B2 (en) | 2004-05-17 |
Family
ID=11716300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP00928896A Expired - Fee Related JP3527349B2 (en) | 1996-01-23 | 1996-01-23 | Surface heating roller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3527349B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002169397A (en) | 2000-11-29 | 2002-06-14 | Ricoh Co Ltd | Heating device and image forming device |
| JP2011248144A (en) * | 2010-05-27 | 2011-12-08 | Brother Ind Ltd | Fixing device |
-
1996
- 1996-01-23 JP JP00928896A patent/JP3527349B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09197871A (en) | 1997-07-31 |
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