JP3397934B2 - Fixing device - Google Patents
Fixing deviceInfo
- Publication number
- JP3397934B2 JP3397934B2 JP09281495A JP9281495A JP3397934B2 JP 3397934 B2 JP3397934 B2 JP 3397934B2 JP 09281495 A JP09281495 A JP 09281495A JP 9281495 A JP9281495 A JP 9281495A JP 3397934 B2 JP3397934 B2 JP 3397934B2
- Authority
- JP
- Japan
- Prior art keywords
- reinforcing member
- fixing roller
- fixing device
- reinforcing
- fixing
- 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】[0001]
【産業上の利用分野】本発明は、内部に熱源を備え、薄
肉の芯金を有する定着ローラと、該定着ローラの外周面
に当接される加圧ローラとを有し、前記定着ローラ内に
円筒形状を保持するための補強部材が設けられている定
着装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a fixing roller having a heat source inside and a thin cored bar, and a pressure roller abutting against the outer peripheral surface of the fixing roller. The present invention relates to a fixing device provided with a reinforcing member for maintaining a cylindrical shape.
【０００２】[0002]
【従来の技術】上記形式の定着装置は周知であり、プリ
ンタ、複写機、ファクシミリ等の主に普通紙を用いる画
像形成装置に付設されている。この種の定着装置は、定
着ローラに薄肉の芯金を使用しているため、定着ローラ
自体の熱容量を小さくでき、定着ローラの立上り時間の
短縮や省電力化が図られるものである。しかし、図７に
示す定着ローラ１００と加圧ローラ１０１を有する一般
的な構成の定着装置において、定着ローラ１００が薄肉
ローラであると、機械的強度が弱いため、図８に示すよ
うな撓みが生じたり、図９に示すような加圧ローラ１０
１に圧接する部分が軸方向につぶれたりする恐れがあ
る。そして、定着ローラ１００が撓めば加圧ローラ１０
１との間で隙間が生じて定着不良を起こし、定着ローラ
１００がつぶれれば、定着ローラ１００の破損を引き起
こすという問題が発生した。2. Description of the Related Art A fixing device of the above type is well known and is attached to an image forming apparatus such as a printer, a copying machine or a facsimile which mainly uses plain paper. Since a fixing device of this type uses a thin cored bar for the fixing roller, the heat capacity of the fixing roller itself can be reduced, and the start-up time of the fixing roller can be shortened and power consumption can be saved. However, in the fixing device having a general configuration including the fixing roller 100 and the pressure roller 101 shown in FIG. 7, when the fixing roller 100 is a thin-walled roller, the mechanical strength is weak, so that the bending as shown in FIG. Or a pressure roller 10 as shown in FIG.
There is a possibility that the portion pressed against 1 may be crushed in the axial direction. If the fixing roller 100 bends, the pressure roller 10
There is a problem in that a gap is formed between the fixing roller 100 and the fixing roller 100, and fixing failure occurs.
【０００３】このような問題を解消するため、特開昭６
１−５９３８１号公報には定着ローラ内に複数の断熱補
強リングが嵌合され、この補強リングに複数本のリング
支持棒を架け渡すようにして支持させている。また、実
開昭５６−７９４９号公報には定着ローラの内周面に複
数の補強リブを設けることが開示されている。In order to solve such a problem, Japanese Unexamined Patent Publication No.
In Japanese Patent Laid-Open No. 1-59381, a plurality of heat insulating reinforcing rings are fitted in a fixing roller, and a plurality of ring support rods are bridged and supported on the reinforcing rings. Further, Japanese Utility Model Laid-Open No. 56-7949 discloses that a plurality of reinforcing ribs are provided on the inner peripheral surface of the fixing roller.
【０００４】上記したそれぞれの定着装置は、定着ロー
ラの強度が増すので、上記した撓みやつぶれが軽減する
ことができ、それに起因する定着不良や定着ローラの破
損を防止することができるものである。In each of the fixing devices described above, since the strength of the fixing roller is increased, it is possible to reduce the above-mentioned bending and crushing, and it is possible to prevent the fixing failure and the damage of the fixing roller due to the bending and crushing. .
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記し
た前者の定着装置では定着ローラ内に幾つもの部材を設
置することは薄肉ローラで熱容量を小さくした利点が大
幅に損なわれるとともに、リング支持棒がヒータからの
光を遮断して定着ローラの温度ムラの発生を引き起こす
恐れがあった。However, in the former fixing device described above, installing a number of members in the fixing roller significantly impairs the advantage of reducing the heat capacity of the thin roller, and the ring support rod is a heater. There is a risk that the light from the printer may be blocked to cause uneven temperature of the fixing roller.
【０００６】また、後者の定着装置も定着ローラに所望
の強度得られる補強リブを設けると、薄肉ローラで熱容
量を小さくした利点が大幅に損なわれてしまうという問
題があった。Also, in the latter fixing device, when the fixing roller is provided with a reinforcing rib to obtain a desired strength, there is a problem that the advantage of reducing the heat capacity of the thin roller is greatly impaired.
【０００７】本発明は、上記した従来の問題を解消し、
薄肉の芯金を有する定着ローラであっても所望の強度が
得られ、しかも薄肉の芯金を有する定着ローラの利点を
大幅に損なうことなく享受することができる定着装置を
提供することを目的としている。The present invention solves the above-mentioned conventional problems,
An object of the present invention is to provide a fixing device that can obtain a desired strength even with a fixing roller having a thin cored bar and can enjoy the advantages of the fixing roller having a thin cored bar without significantly impairing it. There is.
【０００８】[0008]
【課題を解決するための手段】この目的を達成するため
に本発明は、内部に熱源を備え、薄肉の芯金を有する定
着ローラと、該定着ローラの外周面に当接される加圧ロ
ーラとを有し、前記定着ローラ内に円筒形状を保持する
ための補強部材が設けられている定着装置において、前
記補強部材が板状体をリング形状に形成してなり、かつ
その外縁部に前記定着ローラの内周面に幅を持って当接
する円筒状舌部が設けられているとともに、該補強部材
が前記定着ローラの中央側と両端側との位置に設けら
れ、中央側の補強部材より両端側の補強部材が小さい熱
容量に設定されていることを特徴としている。To achieve this object, the present invention provides a fixing roller having a heat source inside and a thin cored bar, and a pressure roller abutting against the outer peripheral surface of the fixing roller. And a reinforcing member for holding a cylindrical shape inside the fixing roller, wherein the reinforcing member is formed by forming a plate-like body into a ring shape, and the outer edge portion thereof is provided with the above-mentioned A cylindrical tongue portion that comes into contact with the inner peripheral surface of the fixing roller with a width is provided, and the reinforcing members are provided at positions of the center side and both end sides of the fixing roller, and The reinforcing members on both ends are set to have a small heat capacity.
【０００９】なお、本発明は、前記両端側に設けた補強
部材の位置がそれぞれ前記熱源の発熱部より外側である
と、効果的である。The present invention is effective when the positions of the reinforcing members provided on both end sides are outside the heat generating portion of the heat source.
【００１０】さらに、前記補強部材に、リング形状の一
部を切り離す切り離し部が設けられていると、効果的で
ある。さらにまた、前記補強部材に、その一部を切り取
って形成される切り欠きが複数個設けられていると、効
果的である。Further, it is effective that the reinforcing member is provided with a separating portion for separating a part of the ring shape. Furthermore, it is effective that the reinforcing member is provided with a plurality of notches formed by cutting a part thereof.
【００１１】さらにまた、前記補強部材が前記定着ロー
ラの中央側と両端側との位置に設けられ、両端側の補強
部材のリング内径が中央側の補強部材のリング内径より
小径であると、効果的である。Further, it is advantageous that the reinforcing members are provided at the positions of the center side and both ends of the fixing roller, and the ring inner diameters of the reinforcing members at both ends are smaller than the ring inner diameter of the center reinforcing member. Target.
【００１２】[0012]
【００１３】[0013]
【実施例】以下、本発明の実施例を添付図面に従って説
明する。図１は、本発明に係る定着装置の一実施例を示
す側面図、図２はその定着装置の定着ローラ縦断面図で
ある。Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a side view showing an embodiment of a fixing device according to the present invention, and FIG. 2 is a vertical sectional view of a fixing roller of the fixing device.
【００１４】図１及び図２において、定着装置は定着ロ
ーラ１とこれに圧接される加圧ローラ２とを有し、定着
ローラ１は表面にテフロン（商品名）等の耐熱離型性材
料からなる離型層１１が形成された芯金パイプ１０と、
該芯金パイプ１０内に配置された熱源としての２本のヒ
ータ３，４とを備えている。芯金パイプ１０の材質は、
本例の場合、熱伝導性、機械的強度及びコスト面でバラ
ンスの取れたアルミ、鉄で作られており、またその肉厚
は０．３〜０．８mm程度の薄いものが用いられている。
さらに、芯金パイプ１０の外径は２０〜４０mm程度の大
きさに設定されている。この定着ローラ１は、熱容量が
極めて小さいので、その立上り時間の短縮や省電力化が
図られるものである。In FIGS. 1 and 2, the fixing device has a fixing roller 1 and a pressure roller 2 which is pressed against the fixing roller 1. The fixing roller 1 is made of a heat-resistant release material such as Teflon (trade name) on the surface thereof. Core metal pipe 10 on which a release layer 11 is formed,
It is provided with two heaters 3 and 4 as heat sources arranged in the core pipe 10. The material of the core pipe 10 is
In the case of this example, it is made of aluminum and iron that are well-balanced in terms of thermal conductivity, mechanical strength and cost, and the wall thickness thereof is as thin as about 0.3 to 0.8 mm. .
Further, the outer diameter of the core pipe 10 is set to a size of about 20 to 40 mm. Since the fixing roller 1 has an extremely small heat capacity, the rise time can be shortened and power can be saved.
【００１５】また、上記ヒータ３，４としては本例の場
合、熱応答性、耐久性に優れたハロゲンランプが用いら
れており、２本のヒータ３，４はそれぞれ両端がブラケ
ット７，８に保持され、ブラケット７，８は図示してい
ない位置で側板２０，２１に固定されている。この２本
のヒータ３，４は、加熱する発熱部５，６の領域を異な
るように設定されており、本例では各種サイズの転写材
がセンター基準で搬送されるものであって、ヒータ３の
発熱部５が最小サイズ紙の通紙部に対応して設けられ、
ヒータ４の発熱部６がこれ以外の部分、すなわち最大サ
イズ紙の通紙部に熱供給を行うように設けられている。
この２本ヒータ３，４は、最小サイズ紙を通紙すると
き、発熱部５が小サイズ紙に対応したヒータ３を点灯さ
せ、大サイズ紙を通紙するとき、ヒータ３，４とも点灯
させるように制御すれば、最小サイズ紙を連続して通紙
した直後に最大サイズ紙を通紙しても、オフセット、巻
き付き、ジャムの不具合の発生を防止することができ
る。Further, in the case of the present example, as the heaters 3 and 4, halogen lamps excellent in thermal response and durability are used, and the two heaters 3 and 4 have brackets 7 and 8 at both ends, respectively. The brackets 7 and 8 are held and fixed to the side plates 20 and 21 at positions not shown. The two heaters 3 and 4 are set so that the areas of the heat generating portions 5 and 6 to be heated are different from each other, and in this example, transfer materials of various sizes are conveyed on the basis of the center. The heat generating part 5 of is provided corresponding to the paper passing part of the smallest size paper,
The heat generating portion 6 of the heater 4 is provided so as to supply heat to the other portion, that is, the paper passing portion for the maximum size paper.
These two heaters 3 and 4 turn on the heater 3 corresponding to the small size paper when the minimum size paper is passed, and turn on the heaters 3 and 4 when passing the large size paper. By controlling in this way, even if the maximum size paper is passed immediately after the minimum size paper is continuously passed, it is possible to prevent the occurrence of problems such as offset, winding, and jam.
【００１６】定着ローラ１は、その両端に断熱ブッシュ
２２，２３が嵌合され、この断熱ブッシュ２２，２３に
軸受２４，２５が設けられており、定着ローラ１は断熱
ブッシュ２２，２３及び軸受２４，２５を介して側板２
０，２１に回転自在に支持されている。さらに、定着ロ
ーラ１の一端には、歯車２６が設けられ、図示していな
い駆動源からの駆動を伝達される。上記断熱ブッシュ２
２，２３は、定着ローラ１から側板２０，２１への熱放
散（熱伝導）を極力減らし、定着ローラ１の温度ムラの
低減、軸受２４，２５の耐久性の向上、省電力化を図る
ためのものである。なお、符号２７，２８は断熱ブッシ
ュ２２，２３及び歯車２６の止め具である。The fixing roller 1 has heat insulating bushes 22 and 23 fitted at both ends thereof, and bearings 24 and 25 are provided on the heat insulating bushes 22 and 23. The fixing roller 1 has the heat insulating bushes 22 and 23 and the bearing 24. , 25 through side plate 2
It is rotatably supported at 0 and 21. Further, a gear 26 is provided at one end of the fixing roller 1 to transmit the drive from a drive source (not shown). Insulation bush 2 above
2 and 23 are for reducing heat dissipation (heat conduction) from the fixing roller 1 to the side plates 20 and 21 as much as possible, reducing temperature unevenness of the fixing roller 1, improving durability of the bearings 24 and 25, and saving power. belongs to. Note that reference numerals 27 and 28 are stoppers for the heat insulating bushes 22 and 23 and the gear 26.
【００１７】定着ローラ１内には、その円筒形状を保持
するための３個の補強部材１２ａ，１２ｂ，１２ｃが設
けられており、補強部材１２ａ，１２ｂは左右端部に配
置され、補強部材１２ｃは中央に配置されている。な
お、補強部材は個別に説明する場合には符号を１２ａ，
１２ｂ，１２ｃを付し、総称して説明する場合には符号
を１２を付す。また、補強部材１２は３個以上設けるこ
とも可能であるが、補強部材の数が増えれば、その分定
着ローラ１の熱容量が大きくなって定着ローラ１を薄肉
にした効果が薄れるため、好ましいとは言えない。Inside the fixing roller 1, three reinforcing members 12a, 12b, 12c for holding the cylindrical shape are provided. The reinforcing members 12a, 12b are arranged at the left and right ends, and the reinforcing member 12c. Is located in the center. In addition, the reinforcing members are denoted by reference numerals 12a, when individually described.
Reference numerals 12b and 12c are given, and the reference numeral 12 is given when collectively described. It is also possible to provide three or more reinforcing members 12. However, if the number of reinforcing members is increased, the heat capacity of the fixing roller 1 is correspondingly increased, and the effect of thinning the fixing roller 1 is reduced, which is preferable. I can't say.
【００１８】補強部材１２は、図３（ａ），（ｂ）に示
すように、薄板状体のものをリング形状に形成してな
り、その外縁部に芯金パイプ１０の内周面に適宜な幅を
持って全面的に当接する円筒状舌部１３が設けられてい
る。この場合、補強部材１２は芯金パイプ１０内に締ま
りばめ状態で係合され、補強部材１２と芯金パイプ１０
の内壁とが一体的になるよう構成されている。As shown in FIGS. 3 (a) and 3 (b), the reinforcing member 12 is formed of a thin plate in the shape of a ring, and its outer edge portion is appropriately formed on the inner peripheral surface of the core pipe 10. A cylindrical tongue portion 13 having a wide width and abutting on the entire surface is provided. In this case, the reinforcing member 12 is engaged in the core metal pipe 10 in an interference fit state, and the reinforcing member 12 and the core metal pipe 10 are engaged.
Is configured to be integrated with the inner wall of the.
【００１９】このように、補強部材１２に円筒状舌部１
３を設けたことにより、該部が幅を持って芯金パイプ１
０の内周面に当接するので、補強部材１２が薄板状体の
ものから作られていても定着ローラ１の機械的強度が得
られる。従って、円筒状舌部１３により、補強部材１２
の倒れ、脱落を防止できるとともに、定着ローラ１の軸
方向のつぶれや撓みも防止できる。さらに、補強部材１
２は薄板状体のものから作られているので、定着ローラ
１の熱容量が大きくならず、立上り時間の短縮や省電力
化という効果を享受することができるものである。As described above, the reinforcing member 12 has the cylindrical tongue 1
By providing 3, the core bar pipe 1 has a width
Since it abuts against the inner peripheral surface of No. 0, the mechanical strength of the fixing roller 1 can be obtained even if the reinforcing member 12 is made of a thin plate member. Therefore, the cylindrical tongue 13 causes the reinforcing member 12 to
The fixing roller 1 can be prevented from collapsing and falling off, and the fixing roller 1 can be prevented from being crushed or bent in the axial direction. Further, the reinforcing member 1
Since 2 is made of a thin plate, the heat capacity of the fixing roller 1 does not increase, and the effect of shortening the start-up time and power saving can be enjoyed.
【００２０】また、補強部材１２は芯金パイプ１０と熱
膨張率が同一か同程度にすることが好適であり、従って
補強部材１２は芯金パイプ１０と同一材質のものを用い
ることが有利である。補強部材１２と芯金パイプ１０の
熱膨張率が同一であれば、実使用時の温度上昇時に補強
部材１２が外れたり、あるいは芯金パイプ１０を強く押
し過ぎたりする恐れがなくなる。さらに、実使用時以外
でも定着ローラ１の切削、研削の機械加工時、テフロン
コート時、ローラ内面塗装時に温度上昇し、このとき補
強部材１２を予めパイプ内に係合させておくことが生産
性が大幅に向上するため有利であるが、この温度上昇時
にも熱膨張率が同一であれば、何ら問題が生じない。ま
た、上記補強部材１２はその肉厚を芯金パイプ１０とほ
ぼ同等にすることが好適であり、ちなみに、芯金パイプ
１０の肉厚が０．３mmの定着ローラ１において、肉厚が
１mmの補強部材１２を用いたときには問題となる温度ム
ラが発生したが、肉厚が０．５mmの補強部材１２を用い
たときには芯金パイプ１０の肉厚とあまり差がなく、何
ら不具合が生じなかった。Further, it is preferable that the reinforcing member 12 has the same or similar coefficient of thermal expansion as that of the cored bar pipe 10. Therefore, it is advantageous to use the reinforcing member 12 of the same material as the cored bar pipe 10. is there. If the thermal expansion coefficients of the reinforcing member 12 and the cored bar pipe 10 are the same, there is no risk of the reinforcing member 12 coming off or the cored bar pipe 10 being pushed too strongly when the temperature rises during actual use. Further, even when not in actual use, the temperature rises during machining of the fixing roller 1 such as cutting and grinding, Teflon coating, and coating of the inner surface of the roller. At this time, the reinforcing member 12 should be engaged in the pipe in advance. However, if the coefficient of thermal expansion is the same even when the temperature rises, no problem occurs. Further, it is preferable that the reinforcing member 12 has a wall thickness substantially equal to that of the core metal pipe 10. Incidentally, in the fixing roller 1 having a core metal pipe 10 having a wall thickness of 0.3 mm, the wall thickness is 1 mm. When the reinforcing member 12 was used, a problematic temperature unevenness occurred, but when the reinforcing member 12 having a wall thickness of 0.5 mm was used, there was not much difference from the wall thickness of the cored bar pipe 10, and no trouble occurred. .
【００２１】また、図３（ａ），（ｂ）に示す補強部材
１２にはリング形状の一部を切り離す切り離し部１４が
設けられている。この切り離し部１４を設けたことによ
り、補強部材１２は上記した機械的強度を維持しつつ芯
金パイプ１０への装着時におけるスラスト負荷抵抗が軽
減される。よって、補強部材１２の装填作業が容易にな
り、生産性が向上する。The reinforcing member 12 shown in FIGS. 3 (a) and 3 (b) is provided with a separating portion 14 for separating a part of the ring shape. By providing the separating portion 14, the reinforcing member 12 reduces the thrust load resistance when the reinforcing member 12 is mounted on the cored bar pipe 10 while maintaining the above-described mechanical strength. Therefore, the loading operation of the reinforcing member 12 is facilitated and the productivity is improved.
【００２２】さらに、図４（ａ），（ｂ）に示す補強部
材１２にはその円筒状舌部１３の一部を切り取って形成
される切り欠き１５が適当数設けられ、本例の場合、ほ
ぼ等間隔で８個の切り欠き１５が形成されている。この
切り欠き１５は、補強部材１２の機械的強度を維持でき
るように、スリット状に形成することが有利である。Further, the reinforcing member 12 shown in FIGS. 4 (a) and 4 (b) is provided with an appropriate number of notches 15 formed by cutting off a part of the cylindrical tongue portion 13. In the case of this example, Eight notches 15 are formed at substantially equal intervals. This notch 15 is advantageously formed in a slit shape so that the mechanical strength of the reinforcing member 12 can be maintained.
【００２３】このように構成した補強部材１２は、機械
的強度を維持して芯金パイプ１０への装着時におけるス
ラスト負荷抵抗が軽減できので、補強部材１２の装填作
業が容易になる。The reinforcing member 12 thus constructed can maintain the mechanical strength and reduce the thrust load resistance when the reinforcing member 12 is mounted on the cored bar pipe 10, so that the reinforcing member 12 can be easily loaded.
【００２４】なお、上記した補強部材１２は板金を絞り
加工することにより製作できるので、高精度でかつ低コ
スト化が図れる。上記実施例では、補強部材１２を芯金
パイプ１０に締まりばめ状態で係合させたが、補強部材
１２は高耐熱性の接着材を用いて芯金パイプ１０に固定
するようにしてもよい。この場合、適量の接着材を円筒
状舌部１３の外周面に付着して補強部材１２を芯金パイ
プ１０に係合させればよく、このとき円筒状舌部１３の
外形公差を締まりばめ係合より小径にしてもよいので、
芯金パイプ１０への装着時におけるスラスト負荷抵抗が
より軽減できる。よって、補強部材１２の装填作業が容
易になり、生産性がさらに向上することができる。Since the above-mentioned reinforcing member 12 can be manufactured by drawing a sheet metal, it is possible to achieve high precision and cost reduction. In the above embodiment, the reinforcing member 12 is engaged with the cored bar pipe 10 in an interference fit state, but the reinforcing member 12 may be fixed to the cored bar pipe 10 by using a highly heat resistant adhesive. . In this case, an appropriate amount of adhesive may be attached to the outer peripheral surface of the cylindrical tongue 13 to engage the reinforcing member 12 with the cored bar pipe 10. At this time, the outer shape tolerance of the cylindrical tongue 13 is tightly fitted. Since the diameter may be smaller than the engagement,
Thrust load resistance when mounted on the core pipe 10 can be further reduced. Therefore, the work of loading the reinforcing member 12 is facilitated, and the productivity can be further improved.
【００２５】ところで、定着ローラ１の両端部は対流熱
放散や軸受等を設けている等により中央領域との間で多
少の温度ムラが生じてしまう。このため、本発明では次
のような措置を講じて中央と両端部の温度ムラを極力小
さくするように構成している。By the way, since both ends of the fixing roller 1 are provided with convection heat dissipation, bearings and the like, some temperature unevenness occurs between the fixing roller 1 and the central area. Therefore, in the present invention, the following measures are taken to minimize temperature unevenness in the center and both ends.
【００２６】まず、両端側に取り付けた補強部材１２
ａ，１２ｂは中央に取り付けた補強部材１２ｃよりも小
さい熱容量に設定する。この設定により、両端側に取り
付けた補強部材１２ａ，１２ｂの方が中央に取り付けた
補強部材１２ｃよりも熱の逃げる量が少なくなり、中央
と両端部の温度ムラを低減に寄与することができる。な
お、補強部材１２ａ，１２ｂの熱容量を補強部材１２ｃ
より小さくする方法としては、補強部材１２ａ，１２ｂ
の肉厚を補強部材１２ｃよりも薄くしたり、補強部材１
２ａ，１２ｂだけを図４に示すような切り欠き１５を設
けたものを使用したりすれば良い。First, the reinforcing members 12 attached to both ends.
The heat capacities of a and 12b are set to be smaller than those of the reinforcing member 12c attached to the center. With this setting, the amount of heat escaped by the reinforcing members 12a and 12b attached to both ends is smaller than that of the reinforcing member 12c attached in the center, and it is possible to contribute to reduction in temperature unevenness between the center and both ends. In addition, the heat capacity of the reinforcing members 12a and 12b is set to the reinforcing member 12c.
As a method of making it smaller, the reinforcing members 12a and 12b
Is thinner than the reinforcing member 12c, or the reinforcing member 1
Only 2a and 12b may be provided with the notch 15 as shown in FIG.
【００２７】また、両端側に取り付けた補強部材１２
ａ，１２ｂは、例えば、軸受近傍でヒータ４の発熱部６
より外側に設ける。このようにすれば、定着ローラ１内
部の熱がその両端から逃げることを補強部材１２ａ，１
２ｂによって抑制することができる。この場合、両端側
の補強部材１２ａ，１２ｂは中央の補強部材１２ｃより
も内径を小さく設定すれば、熱が逃げる空間面積が小さ
くなるので、より有利である。このとき、補強部材１２
ａ，１２ｂはそれ自体で内径を小さくしてもよいし、補
強部材１２ａ，１２ｂに内径を小さくする部材をヒータ
３，４に接触しないようにして貼付等で設けれてもよ
い。この貼付ける部材としては、断熱性があって熱容量
の小さいものを用いる。また、この構成は上記温度ムラ
を低減するだけでなく、ヒータ３，４の熱効率を高めて
省電力化の利点も得られる。Further, the reinforcing members 12 attached to both ends.
a and 12b are, for example, the heat generating portion 6 of the heater 4 near the bearing.
It is provided outside. By doing so, it is possible to prevent the heat inside the fixing roller 1 from escaping from both ends thereof.
It can be suppressed by 2b. In this case, it is more advantageous to set the inner diameters of the reinforcing members 12a and 12b at both ends to be smaller than that of the central reinforcing member 12c, because the space area where heat escapes becomes smaller. At this time, the reinforcing member 12
The a and 12b may have a small inner diameter by themselves, or members for reducing the inner diameter may be attached to the reinforcing members 12a and 12b by sticking them so as not to contact the heaters 3 and 4. A material having heat insulation and a small heat capacity is used as the attaching member. Further, this structure not only reduces the above-mentioned temperature unevenness, but also enhances the thermal efficiency of the heaters 3 and 4 to obtain the advantage of power saving.
【００２８】なお、本発明の定着ローラ１は薄肉である
ため、加圧ローラ２の加圧力もおのずと限定されしま
う。そこで、定着ローラ１と加圧ローラ２は図５及び図
６に示すように、両ローラの中央部を中心として、例え
ば角度１〜２度クロスさせて加圧接触させることが好ま
しい。このクロス方式を採用すれば、クロスさせないで
平行に加圧接触させるものと比較し、定着ローラ１と加
圧ローラ２の機械的強度が小さいものを用いても定着ニ
ップ幅が均一で加圧力を大きくすることができる。そし
て、定着ローラ１と加圧ローラ２をクロスする位置に補
強部材１２ｃを取り付ければ、薄肉ローラであっても、
定着ローラ１のニップ幅の増大かつ均一化と、加圧力
（画圧）の増大化の効果が得られる。Since the fixing roller 1 of the present invention is thin, the pressing force of the pressure roller 2 is naturally limited. Therefore, as shown in FIGS. 5 and 6, it is preferable that the fixing roller 1 and the pressure roller 2 are brought into pressure contact with each other, for example, by intersecting with each other at an angle of 1 to 2 degrees about the central portion of both rollers. If this cross method is adopted, the fixing nip width will be uniform and the pressing force will be increased even if the fixing roller 1 and the pressing roller 2 having a small mechanical strength are used, as compared with a case where they are pressure-contacted in parallel without being crossed. Can be large. If a reinforcing member 12c is attached at a position where the fixing roller 1 and the pressure roller 2 cross each other, even if it is a thin roller,
The effect of increasing and uniforming the nip width of the fixing roller 1 and increasing the pressing force (image pressure) can be obtained.
【００２９】[0029]
【発明の効果】請求項１の構成によれば、補強部材は板
状体をリング形状に形成してなり、かつその外縁部に定
着ローラの内周面に幅を持って当接する円筒状舌部が設
けられているので、円筒状舌部の幅分が定着ローラの内
周面に当接するように嵌合でき、熱容量が小さい板状体
の補強部材であっても補強支持幅が大きく取ることがで
きる。さらに、補強部材が定着ローラの中央側と両端側
との位置に設けられ、中央側の補強部材より両端側の補
強部材が小さい熱容量に設定されているので、定着ロー
ラの両端部と中央領域との間の温度ムラを低減すること
ができる。According to the structure of the present invention, the reinforcing member is formed by forming the plate-like member into a ring shape, and the outer peripheral portion of the reinforcing member is in contact with the inner peripheral surface of the fixing roller with a certain width. Since the portion is provided, the width of the cylindrical tongue portion can be fitted so as to contact the inner peripheral surface of the fixing roller, and the reinforcing support width can be wide even if the reinforcing member is a plate-shaped member having a small heat capacity. be able to. Furthermore, since the reinforcing members are provided at the positions of the center side and both ends of the fixing roller, and the reinforcing members on both ends are set to have a smaller heat capacity than the reinforcing members on the center side, both ends of the fixing roller and the central region are fixed. It is possible to reduce temperature unevenness between the two.
【００３０】請求項２の構成によれば、両端側の補強部
材の位置はそれぞれ熱源の発熱部より外側であるので、
温度ムラを低減するとともに熱源の加熱効率を高められ
る。According to the structure of claim 2, since the positions of the reinforcing members on both ends are outside the heat generating portion of the heat source,
The temperature unevenness can be reduced and the heating efficiency of the heat source can be improved.
【００３１】請求項３の構成によれば、補強部材にリン
グ形状の一部を切り離す切り離し部が設けられているの
で、補強部材の定着ローラへの嵌め込みが容易になり、
生産性を向上することができる。According to the third aspect of the invention, since the reinforcing member is provided with the separating portion for separating a part of the ring shape, the reinforcing member can be easily fitted into the fixing roller,
Productivity can be improved.
【００３２】請求項４の構成によれば、補強部材にその
一部を切り取って形成される切り欠きが複数個設けられ
ているので、請求項２と同様に補強部材の定着ローラへ
の嵌め込みを容易にすることができる。According to the structure of claim 4, since the reinforcing member is provided with a plurality of notches formed by cutting a part thereof, the reinforcing member is fitted into the fixing roller in the same manner as in claim 2. Can be easy.
【００３３】請求項５の構成によれば、補強部材が定着
ローラの中央側と両端側との位置に設けられ、両端側の
補強部材のリング内径が中央側の補強部材のリング内径
より小径であるので、対流熱放散等を抑えられ、温度ム
ラを低減するとともに熱源の加熱効率を高められる。According to the structure of claim 5, the reinforcing members are provided at the positions of the center and both ends of the fixing roller, and the ring inner diameters of the reinforcing members at both ends are smaller than the ring inner diameter of the center reinforcing member. As a result, convection heat dissipation can be suppressed, temperature unevenness can be reduced, and heating efficiency of the heat source can be improved.
【００３４】[0034]
【００３５】[0035]
【００３６】[0036]
【図１】本発明に係る定着装置の一実施例を示す側面図
である。FIG. 1 is a side view showing an embodiment of a fixing device according to the present invention.
【図２】その定着装置の縦中央拡大断面図である。FIG. 2 is an enlarged vertical center sectional view of the fixing device.
【図３】補強部材の一例を示し、（ａ）は正面図、
（ｂ）はその断面図である。FIG. 3 shows an example of a reinforcing member, (a) is a front view,
(B) is the sectional view.
【図４】補強部材の別の例を示し、（ａ）は正面図、
（ｂ）はその平面図である。FIG. 4 shows another example of a reinforcing member, (a) is a front view,
(B) is the top view.
【図５】定着ローラと加圧ローラ２をクロス方式で加圧
接触させた定着装置の斜視図である。FIG. 5 is a perspective view of a fixing device in which a fixing roller and a pressure roller 2 are brought into pressure contact with each other by a cross method.
【図６】クロス方式で加圧接触させた定着装置の平面図
である。FIG. 6 is a plan view of a fixing device that is brought into pressure contact with a cross method.
【図７】従来の定着装置を示す説明図である。FIG. 7 is an explanatory diagram showing a conventional fixing device.
【図８】従来の定着装置の不具合の一例を示す説明図で
ある。FIG. 8 is an explanatory diagram showing an example of a problem of a conventional fixing device.
【図９】従来の定着装置の別の不具合を示す説明図であ
る。FIG. 9 is an explanatory diagram showing another problem of the conventional fixing device.
１ 定着ローラ ２ 加圧ローラ ３，４ ヒータ ５，６ 発熱部 １０ 芯金パイプ １２ａ，１２ｂ，１２ｃ 補強部材 １３ 円筒状舌部 １４ 切り離し部 １５ 切り欠き 1 fixing roller 2 pressure roller 3,4 heater 5, 6 heating part 10 core pipe 12a, 12b, 12c Reinforcing member 13 Cylindrical tongue 14 Separation part 15 notches
───────────────────────────────────────────────────── フロントページの続き (72)発明者 芝木 弘幸 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 由良 純 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 昭61−59381（ＪＰ，Ａ) 特開 平６−130845（ＪＰ，Ａ) 特開 昭57−155571（ＪＰ，Ａ) 実開 昭56−7949（ＪＰ，Ｕ) 特公 昭45−5143（ＪＰ，Ｂ１) (58)調査した分野(Int.Cl.7，ＤＢ名) G03G 13/20 G03G 15/20 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Shibaki 1-3-3 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (72) Inventor Jun Yura 1-3-6 Nakamagome, Ota-ku, Tokyo (56) References JP-A-61-59381 (JP, A) JP-A-6-130845 (JP, A) JP-A-57-155571 (JP, A) Actual development Sho-56-7949 (JP, U) JP-B-45-5143 (JP, B1) (58) Fields investigated (Int.Cl. 7 , DB name) G03G 13/20 G03G 15/20
Claims (5)
定着ローラと、該定着ローラの外周面に当接される加圧
ローラとを有し、前記定着ローラ内に円筒形状を保持す
るための補強部材が設けられている定着装置において、 前記補強部材が板状体をリング形状に形成してなり、か
つその外縁部に前記定着ローラの内周面に幅を持って当
接する円筒状舌部が設けられているとともに、該補強部
材が前記定着ローラの中央側と両端側との位置に設けら
れ、中央側の補強部材より両端側の補強部材が小さい熱
容量に設定されていることを特徴とする定着装置。1. A fixing roller having a heat source inside and having a thin cored bar, and a pressure roller abutting against the outer peripheral surface of the fixing roller, wherein the fixing roller has a cylindrical shape. In a fixing device provided with a reinforcing member for forming a cylindrical member, the reinforcing member is formed by forming a plate-like member into a ring shape, and the outer edge of the plate member comes into contact with the inner peripheral surface of the fixing roller with a width. A tongue portion is provided, and the reinforcing members are provided at the positions of the central side and both end sides of the fixing roller, and the reinforcing members on both end sides are set to have a smaller heat capacity than the central reinforcing member. Characterizing fixing device.
記両端側に設けた補強部材の位置がそれぞれ前記熱源の
発熱部より外側であることを特徴とする定着装置。2. The fixing device according to claim 1, wherein the positions of the reinforcing members provided on the both ends are outside the heat generating portion of the heat source.
いて、前記補強部材に、リング形状の一部を切り離す切
り離し部が設けられていることを特徴とする定着装置。3. The fixing device according to claim 1 or 2, wherein the reinforcing member is provided with a separating portion for separating a part of the ring shape.
定着装置において、前記補強部材に、その一部を切り取
って形成される切り欠きが複数個設けられていることを
特徴とする定着装置。4. The fixing device according to claim 1, wherein the reinforcing member is provided with a plurality of notches formed by cutting a part thereof. Fixing device.
定着装置において、前記補強部材が前記定着ローラの中
央側と両端側との位置に設けられ、両端側の補強部材の
リング内径が中央側の補強部材のリング内径より小径で
あることを特徴とする定着装置。5. The fixing device according to claim 1, wherein the reinforcing member is provided at positions of a center side and both end sides of the fixing roller, and ring inner diameters of the reinforcing members at both end sides. Is smaller than the ring inner diameter of the reinforcing member on the center side.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09281495A JP3397934B2 (en) | 1995-04-18 | 1995-04-18 | Fixing device |
| US08/634,734 US5708949A (en) | 1995-04-18 | 1996-04-18 | Image fixing device for image forming apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09281495A JP3397934B2 (en) | 1995-04-18 | 1995-04-18 | Fixing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08286541A JPH08286541A (en) | 1996-11-01 |
| JP3397934B2 true JP3397934B2 (en) | 2003-04-21 |
Family
ID=14064894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP09281495A Expired - Fee Related JP3397934B2 (en) | 1995-04-18 | 1995-04-18 | Fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3397934B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4811124B2 (en) * | 2006-05-23 | 2011-11-09 | 富士ゼロックス株式会社 | Fixing device |
| JP5819014B1 (en) * | 2015-01-29 | 2015-11-18 | ミツマ技研株式会社 | Heat roll fixing device and heat roller |
| JP2020095201A (en) * | 2018-12-14 | 2020-06-18 | 富士ゼロックス株式会社 | Heating device, fixing device, and image forming device |
-
1995
- 1995-04-18 JP JP09281495A patent/JP3397934B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08286541A (en) | 1996-11-01 |
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