JPH10207267A - Self-heating type fixing roller, manufacture thereof, and fixing device - Google Patents
Self-heating type fixing roller, manufacture thereof, and fixing deviceInfo
- Publication number
- JPH10207267A JPH10207267A JP663397A JP663397A JPH10207267A JP H10207267 A JPH10207267 A JP H10207267A JP 663397 A JP663397 A JP 663397A JP 663397 A JP663397 A JP 663397A JP H10207267 A JPH10207267 A JP H10207267A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- core material
- self
- fixing roller
- heating type
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Fixing For Electrophotography (AREA)
- Control Of Resistance Heating (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、円筒状の芯材の内
面に発熱抵抗体層を有する自己発熱型定着ローラ、その
製造方法、該自己発熱型定着ローラを用いる画像形成装
置の定着装置に関する。The present invention relates to a self-heating type fixing roller having a heating resistor layer on the inner surface of a cylindrical core material, a method of manufacturing the same, and a fixing device of an image forming apparatus using the self-heating type fixing roller. .
【０００２】[0002]
【従来の技術】近年、電子写真方式を用いた複写機、プ
リンタ、ファクシミリ等の画像形成装置において、省エ
ネルギー化がうたわれており、その方法の一つとして自
己発熱型定着ローラを用いた方式が提案されている。こ
の方式は、自己発熱型であるためにハロゲンヒータを用
いたものに比べ、熱効率がよく、高速立ち上がりをねら
えるというメリットがある。このような自己発熱型定着
ローラの方式としては、円筒状の芯材の外面に発熱抵抗
体層がある方式、芯材そのものがセラミックスに導体を
混在させたような発熱体である方式、芯材の内面に発熱
抵抗体層がある方式の３つに大別される。これらのどの
方式においても、高速に立ち上げるためにはなるべく芯
材の熱容量を下げるためにその肉厚を薄くした方がよ
い。これら３つの方式のうち、特に内面に発熱抵抗体層
を持つ方式においては、その芯材を通って熱を伝えるた
め、より薄肉化することが望まれる。しかしながら、薄
肉化すると強度が弱くなり、定着ローラに対向して加圧
ローラを配置し、用紙を挟んでトナーを定着させる場
合、定着ローラにたわみやつぶれが発生し、用紙にシワ
を発生させる、部分的に定着性能が劣化する等の現象が
発生することがある。2. Description of the Related Art In recent years, energy savings have been claimed in image forming apparatuses such as copiers, printers, and facsimile machines using an electrophotographic system. As one of the methods, a system using a self-heating type fixing roller has been proposed. Have been. This method is advantageous in that it has better thermal efficiency and can aim at a high-speed start-up as compared with the method using a halogen heater because it is a self-heating type. Examples of such a self-heating type fixing roller include a system in which a heating resistor layer is provided on an outer surface of a cylindrical core material, a system in which the core material itself is a heating element in which a conductor is mixed in ceramics, and a core material. Are roughly divided into three types in which a heating resistor layer is provided on the inner surface. In any of these methods, in order to start up at high speed, it is preferable to reduce the thickness of the core material in order to reduce the heat capacity of the core material as much as possible. Of these three systems, in particular, in the system having a heating resistor layer on the inner surface, it is desired to further reduce the thickness in order to transfer heat through the core material. However, when the thickness is reduced, the strength is weakened, and when a pressure roller is arranged opposite to the fixing roller and the toner is fixed across the sheet, the fixing roller bends and crushes, causing wrinkles on the sheet. In some cases, a phenomenon such as a deterioration in fixing performance may occur.
【０００３】これらの防止と、給電部を兼ねる方法とし
て、ローラの端部にジャーナルを兼ねた給電部を配置
し、このジャーナル給電部に対してその円周上や端部か
ら給電ブラシなどによって給電を行っている。しかしな
がら、ジャーナルと一体化することで強度は得られるも
のの、その部分の熱容量が大きいため、端部側の発熱量
を多くしないと端部の温度が上がりきらない、無駄な電
力を必要とする等の不具合が発生した。また、これとは
別の給電方法として、例えば図１０に示すように、円筒
状の芯材８０の外側にリング状の給電部８２を設け、そ
の円周方向から給電ブラシ８４を当てるものがある。図
中、符号８６は加圧ローラ、８８は温度センサ、９０は
交流、９２はトライアックを示す。しかしながらこの方
式では、芯材８０の内面に発熱抵抗体層がある場合に
は、その構成を取るためには芯材８０の端部の外側に電
極を回して発熱抵抗体層と給電部８２をつなぐか、芯材
８０自体に穴を開けて給電部８２とつなぐか、あるいは
芯材８０に電気を通す等複雑な構成を取らなければなら
なかった。As a method of preventing the above and also serving as a power supply section, a power supply section also serving as a journal is arranged at the end of the roller, and power is supplied to the journal power supply section from the circumference or the end by a power supply brush or the like. It is carried out. However, although the strength can be obtained by integrating with the journal, the heat capacity of that part is large, so the temperature of the end cannot be increased unless the amount of heat generated at the end is increased, and wasteful power is required, etc. Problem occurred. As another power supply method, for example, as shown in FIG. 10, there is a method in which a ring-shaped power supply portion 82 is provided outside a cylindrical core material 80 and a power supply brush 84 is applied from a circumferential direction thereof. . In the drawing, reference numeral 86 indicates a pressure roller, 88 indicates a temperature sensor, 90 indicates an alternating current, and 92 indicates a triac. However, in this method, when the heating resistor layer is provided on the inner surface of the core material 80, in order to take the configuration, the electrode is turned outside the end of the core material 80 to connect the heating resistor layer and the power supply portion 82. It is necessary to take a complicated structure such as connecting the core member 80 itself to make a hole in the core member 80 and connecting the core member 80 to the power supply portion 82 or conducting electricity through the core member 80.
【０００４】さらなる不具合として、給電部と給電ブラ
シの接触面積が大きい場合、ローラの熱が給電部を通し
て逃げてしまう状況となることがあった。この場合に
も、端部側の発熱量を多くしないとローラ端部の温度が
上がりきらない、無駄な電力を必要とする等の不具合が
発生した。また別の不具合として、給電部と給電ブラシ
がローラの外側にある場合には、その摩耗粉がローラ表
面や装置内部の電装部品に対して悪影響を及ぼし、寿命
を早めたり故障させたりすることがあった。特に、給電
ブラシが給電部の円周上にある場合、給電ブラシの走行
距離が長くなり、摩耗粉が出やすい状況になっていた。
なお、ハロゲンランプ方式においては、放熱を抑制する
観点から、ローラ端部の開口がなるべく狭くなるように
ハロゲンランプの保持部材を配置してエネルギー効率を
上げ、且つ、機内の温度上昇を押さえるものがある。[0004] As a further disadvantage, when the contact area between the power supply portion and the power supply brush is large, heat of the roller may escape through the power supply portion. Also in this case, unless the amount of heat generated at the end portion is increased, the temperature at the end portion of the roller cannot be increased, and unnecessary power is required. Another problem is that when the power supply unit and the power supply brush are outside the roller, the abrasion powder may have an adverse effect on the roller surface and on the electrical components inside the device, shortening the service life and causing failure. there were. In particular, when the power supply brush is located on the circumference of the power supply unit, the traveling distance of the power supply brush becomes long, and abrasion powder is easily generated.
In the halogen lamp system, from the viewpoint of suppressing heat radiation, a holder for the halogen lamp is arranged so that the opening at the end of the roller is as narrow as possible to increase energy efficiency and to suppress a rise in temperature inside the machine. is there.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、上述した従
来技術の諸問題を単純な構成でコストアップを来すこと
なく解決することにある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art with a simple configuration without increasing the cost.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決すするた
めに、請求項１記載の発明では、円筒状の芯材の内周面
に発熱抵抗体層が形成された自己発熱型定着ローラにお
いて、前記発熱抵抗体層はその両側の端部が前記芯材の
長手方向の内側になる長さに形成され、内蓋状をなす導
電性の給電部が前記芯材の両端部から挿入されて前記発
熱抵抗体層の両端部に接触され、且つ、該導電性の給電
部は前記芯材の端部より長手方向の内側に位置するよう
に設けられている、という構成を採っている。In order to solve the above-mentioned problems, according to the present invention, there is provided a self-heating type fixing roller in which a heating resistor layer is formed on an inner peripheral surface of a cylindrical core material. The heating resistor layer is formed such that both ends thereof are located inside the core material in the longitudinal direction, and a conductive power supply portion having an inner lid shape is inserted from both ends of the core material. The configuration is such that both ends of the heating resistor layer are in contact with each other, and the conductive power supply portion is provided inside the end of the core material in the longitudinal direction.
【０００７】請求項２記載の発明では、請求項１記載の
構成において、前記給電部の固定は、該給電部と前記発
熱抵抗体層を含む芯材に温度差を付けた状態で嵌合して
固定する焼ばめである、という構成を採っている。請求
項３記載の発明では、請求項２記載の自己発熱型定着ロ
ーラの製造方法において、前記焼ばめ工程における前記
芯材を加熱する工程は、該芯材の外周面に離形層を形成
する工程、もしくは内周面に発熱抵抗体層を形成する工
程であって、これらいずれかの工程の直後、又はその工
程内に、前記芯材に対して低温の前記給電部を挿入す
る、という手順を採っている。According to a second aspect of the present invention, in the configuration of the first aspect, the power supply unit is fixed by fitting the power supply unit and a core material including the heating resistor layer with a temperature difference. It is a shrink fit that is fixed. According to a third aspect of the present invention, in the method of manufacturing a self-heating type fixing roller according to the second aspect, the step of heating the core in the shrink-fitting step includes forming a release layer on an outer peripheral surface of the core. Or the step of forming a heating resistor layer on the inner peripheral surface, immediately after any one of these steps, or during the step, inserting the low-temperature power supply unit into the core material. We are taking steps.
【０００８】請求項４記載の発明では、請求項１又は２
記載の自己発熱型定着ローラを用いる定着装置におい
て、前記給電部の前記芯材に対する配置位置は、最大通
紙幅の外側で、且つ、前記自己発熱型定着ローラを保持
する軸受より内側である、という構成を採っている。請
求項５記載の発明では、請求項１又は２記載の自己発熱
型定着ローラにおいて、前記給電部の平均肉厚は前記芯
材の肉厚以下である、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又は２記載の自己発熱型定
着ローラにおいて、前記給電部は、非導電性で耐熱性の
材料よりなる給電部ホルダにより保持されて前記芯材の
両端から挿入され、固定される、という構成を採ってい
る。According to the invention described in claim 4, claim 1 or 2
In the fixing device using the self-heating type fixing roller as described above, the position of the power supply unit with respect to the core material is outside the maximum sheet passing width and inside the bearing that holds the self-heating type fixing roller. It has a configuration. According to a fifth aspect of the present invention, in the self-heating type fixing roller according to the first or second aspect, an average thickness of the power supply portion is equal to or less than a thickness of the core material. According to a sixth aspect of the present invention, in the self-heating type fixing roller according to the first or second aspect, the power supply unit is held by a power supply unit holder made of a non-conductive and heat-resistant material, and is held from both ends of the core material. It is configured to be inserted and fixed.
【０００９】請求項７記載の発明では、請求項６記載の
自己発熱型定着ローラにおいて、前記給電部ホルダは、
前記芯材への挿入方向後端側の少なくとも一部に芯材の
径方向に突出するストッパを有している、という構成を
採っている。請求項８記載の発明では、請求項７記載の
自己発熱型定着ローラにおいて、前記ストッパは、前記
芯材の外径より突出しない大きさである、という構成を
採っている。請求項９記載の発明では、請求項６記載の
自己発熱型定着ローラにおいて、前記給電部ホルダは前
記給電部に対して一体的に形成される、という構成を採
っている。According to a seventh aspect of the present invention, in the self-heating type fixing roller according to the sixth aspect, the power supply section holder includes:
At least a part of the core material at the rear end side in the insertion direction has a stopper that protrudes in the radial direction of the core material. According to an eighth aspect of the present invention, in the self-heating type fixing roller according to the seventh aspect, the stopper has a size that does not protrude from an outer diameter of the core material. According to a ninth aspect of the present invention, in the self-heating type fixing roller according to the sixth aspect, the power supply unit holder is formed integrally with the power supply unit.
【００１０】請求項１０記載の発明では、請求項９記載
の自己発熱型定着ローラにおいて、前記給電部における
前記芯材の軸心に対して垂直な面に、軸心回りに３個以
上の開口部が形成され、該開口部に前記給電部ホルダの
一部が嵌合するように固定されている、という構成を採
っている。請求項１１記載の発明では、請求項１又は２
記載の自己発熱型定着ローラを用いる定着装置におい
て、前記給電部に対する本体側からの給電は、ローラの
両端側よりその軸方向内方に向かって、ローラ軸心を含
む部分に対して摺動可能な給電端子を押し当てる構成で
あって、該給電端子と前記給電部の接触面が前記芯材の
内径の１／３以下の大きさである、という構成を採って
いる。According to a tenth aspect of the present invention, in the self-heating type fixing roller according to the ninth aspect, three or more openings around the axis are provided on a plane perpendicular to the axis of the core material in the power supply portion. The power supply unit holder is fixed so that a part of the power supply unit holder is fitted into the opening. In the invention according to claim 11, claim 1 or 2
In the fixing device using the self-heating type fixing roller as described above, power supply from the main body side to the power supply unit is slidable toward a portion including the roller axis from both ends of the roller toward the inside in the axial direction. And a contact surface between the power supply terminal and the power supply section is one third or less of the inner diameter of the core material.
【００１１】[0011]
【実施例】以下、本発明の実施例を図に基づいて説明す
る。図１に示すように、自己発熱型定着ローラ２は、ア
ルミニウムで形成された円筒状の芯材４と、芯材４の外
周面に形成されたＰＴＦＥによる離形層６と、内周面に
形成された非導電性樹脂によるオフセット防止のための
絶縁層８と、さらに絶縁層８の内周面に形成された銀合
金による発熱抵抗体層１０と、芯材４の両端部に挿入し
て固定された断面コ字状の内蓋状をなす導電性の給電部
としての給電キャップ１２と、発熱抵抗体層１０の端部
を保護するとともに給電キャップ１２に嵌合する導電性
の保護テープ１４とから構成されている。発熱抵抗体層
１０は、芯材４の長手方向の内側になる長さ（Ｌ2 ＜Ｌ
1 ）に形成されており、給電キャップ１２も芯材４の端
部の内側に設けられている。給電キャップ１２に外部か
ら給電端子が接触されると、保護テープ１４を介して発
熱抵抗体層１０に通電がなされ、発熱抵抗体層１０が発
熱する。離形層６としては他にＰＦＡ等を採用すること
ができ、絶縁層８としては他にセラミックス等を採用で
きる。また、発熱抵抗体層１０としては他に炭素繊維等
を採用することができる。本実施例においては、絶縁層
８を設けたが、芯材４自体が非導電性の素材、例えばガ
ラスやセラミック等であればこの絶縁層８は不要とな
る。また、発熱抵抗体層１０の端部に導電性の保護テー
プ１４を設けたが、これを設けずに給電キャップ１２を
直接発熱抵抗体層１０に接触させる構成であってもよい
（請求項１）。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the self-heating type fixing roller 2 includes a cylindrical core member 4 made of aluminum, a release layer 6 made of PTFE formed on an outer peripheral surface of the core member 4, and an inner peripheral surface. An insulating layer 8 for preventing offset by the formed non-conductive resin, a heating resistor layer 10 made of a silver alloy formed on the inner peripheral surface of the insulating layer 8, and inserted into both ends of the core material 4. A power supply cap 12 as a conductive power supply portion having an inner lid shape having a fixed U-shaped cross section, and a conductive protection tape 14 that protects an end of the heating resistor layer 10 and fits into the power supply cap 12. It is composed of The heating resistor layer 10 has a length (L 2 <L) inside the core material 4 in the longitudinal direction.
The power supply cap 12 is also provided inside the end of the core material 4. When a power supply terminal comes into contact with the power supply cap 12 from the outside, power is supplied to the heating resistor layer 10 via the protective tape 14, and the heating resistor layer 10 generates heat. PFA or the like can be adopted as the release layer 6, and ceramics or the like can be adopted as the insulating layer 8. In addition, carbon fiber or the like can be adopted as the heating resistor layer 10. In this embodiment, the insulating layer 8 is provided. However, if the core material 4 itself is a non-conductive material, for example, glass or ceramic, the insulating layer 8 becomes unnecessary. In addition, the conductive protection tape 14 is provided at the end of the heating resistor layer 10, but the power supply cap 12 may directly contact the heating resistor layer 10 without providing the conductive protection tape 14. ).
【００１２】芯材４に対する給電キャップ１２の固定に
は、銀系合金のペーストを接着剤として用いてもよい
が、定着ローラ（自己発熱型定着ローラ２）はその使用
環境により、ヒートサイクルや用紙の進入による振動な
どが加わるため、その接着強度を保つためには、高い加
工精度が要求される。このため、本実施例では、芯材４
を一旦３００°から４００℃程度に加熱し、加熱された
芯材４に対して、ほぼ常温から１００℃程度の給電キャ
ップ１２を挿入して固定する焼ばめ方式を採用してい
る。常温では、給電キャップ１２が固定される部分の内
径は、給電キャップ１２の外径に対して、０．０１ｍｍ
〜０．１ｍｍ程度小さくなっていれば、２００℃程度温
度差が生じているときには０．１ｍｍ程度（この数値は
芯材４の内径やその材質によって異なる。）芯材４の内
径が大きくなり、容易に給電キャップ１２の挿入が可能
であり、両者の温度差がなくなったときには確実な固定
が可能となる。給電キャップ１２と芯材４は使用時に加
熱されることがあっても、その温度差が１００℃以上と
なることは現実的にあり得ないため、接着剤を用いるよ
りも確実且つ低コストな固定方法と言える。定着ローラ
の端部においてもその外径精度が要求される場合には、
前述の内径と外径の差を０．０１〜０．０５ｍｍ程度に
抑えれば、加工上もほぼ問題なく加工することが可能
で、外径精度も高いまま保つことができる（請求項
２）。For fixing the power supply cap 12 to the core member 4, a paste of a silver alloy may be used as an adhesive, but the fixing roller (self-heating type fixing roller 2) may have a heat cycle or paper depending on its use environment. Vibration and the like due to the intrusion of the steel are added, and high processing accuracy is required to maintain the adhesive strength. For this reason, in the present embodiment, the core material 4
Is temporarily heated to about 300 ° C. to 400 ° C., and a shrink fit method is adopted in which the feeding cap 12 at about room temperature to about 100 ° C. is inserted and fixed to the heated core 4. At normal temperature, the inner diameter of the portion to which the power supply cap 12 is fixed is 0.01 mm with respect to the outer diameter of the power supply cap 12.
If the temperature difference is reduced by about 200 ° C., the inner diameter of the core 4 increases by about 0.1 mm (this value varies depending on the inner diameter of the core 4 and its material). The power supply cap 12 can be easily inserted, and when the temperature difference between the two disappears, the power supply cap 12 can be securely fixed. Even if the power supply cap 12 and the core material 4 are heated during use, the temperature difference cannot be more than 100 ° C., and therefore, the fixing can be performed more securely and at a lower cost than using an adhesive. A way to say. If the outer diameter accuracy is required even at the end of the fixing roller,
If the difference between the inner diameter and the outer diameter described above is suppressed to about 0.01 to 0.05 mm, processing can be performed with almost no problem in processing, and the accuracy of the outer diameter can be kept high. .
【００１３】また、上記焼ばめ工程における芯材４の加
熱工程は、離形層６の焼付け工程又は発熱抵抗体層１０
を付ける工程としている。これらはいずれも自己発熱型
定着ローラ２の本来の製造工程の一つであり、これを利
用することによって、給電キャップ１２の固定のための
みに芯材４の加熱工程を別途設ける必要がない（請求項
３）。The heating step of the core material 4 in the shrink-fitting step may be a step of baking the release layer 6 or a step of heating the heating resistor layer 10.
Is attached. These are all one of the original manufacturing steps of the self-heating type fixing roller 2, and by using these, there is no need to separately provide a heating step of the core material 4 only for fixing the power supply cap 12 ( Claim 3).
【００１４】図２は、上記実施例で示した自己発熱型定
着ローラ２を用いた定着装置１６の概要をを示してい
る。符号１８は加圧ローラであり、自己発熱型定着ロー
ラ２に圧接されている。自己発熱型定着ローラ２はその
両端部を軸受２０で保持されている。給電キャップ１２
の位置は、芯材４の軸方向において最大通紙幅（通紙領
域）の外側で、且つ、軸受２０の内側に設定されてい
る。なお、本図においては発熱抵抗体層１０を省略して
いる。次に、給電キャップ１２の上記設定位置の理由を
述べる。図３は、給電キャップ１２の存在が及ぼす自己
発熱型定着ローラ２の加圧力に対するつぶれ量を示す実
験グラフである。条件は下記の通りである。 芯材の材料：外径３０ｍｍのアルミニウム製 芯材肉厚：０．８ｍｍ ａ：給電キャップが無い場合 ｂ：給電キャップの肉厚が０．３ｍｍで、軸受位置に配
置 ｃ：給電キャップの肉厚が０．３ｍｍで、軸受から内側
１５ｍｍの位置に配置 ｄ：給電キャップの肉厚が０．８ｍｍで、軸受から内側
１５ｍｍの位置に配置 図２から分かるように、ｃの場合、通紙領域より若干広
い範囲で加圧ローラ１８により加圧されても、つぶれ量
が少なくなる。給電キャップ１２を軸受２０の位置とし
た場合にはその効果は少ないものになる。なお、給電キ
ャップ１２の肉厚を芯材４の肉厚と同じにした場合には
（ｄ）、つぶれ量はさらに少なくなるが、中央の温度制
御に対して立ち上がり時の端部温度が約４０℃落ち込ん
でしまうことが確認され、立ち上がり直後の定着不良が
発生することがあった。このため、本発明では給電キャ
ップ１２の平均肉厚を芯材４の肉厚以下としている（請
求項４，５）。FIG. 2 shows an outline of a fixing device 16 using the self-heating type fixing roller 2 shown in the above embodiment. Reference numeral 18 denotes a pressure roller, which is pressed against the self-heating type fixing roller 2. Both ends of the self-heating type fixing roller 2 are held by bearings 20. Power supply cap 12
Is set outside the maximum sheet passing width (sheet passing area) in the axial direction of the core member 4 and inside the bearing 20. Note that the heating resistor layer 10 is omitted in FIG. Next, the reason for the set position of the power supply cap 12 will be described. FIG. 3 is an experimental graph showing the amount of crushing caused by the presence of the power supply cap 12 with respect to the pressing force of the self-heating type fixing roller 2. The conditions are as follows. Material of core material: Aluminum made of aluminum having an outer diameter of 30 mm Thickness: 0.8 mm a: When there is no power supply cap b: Thickness of power supply cap is 0.3 mm and placed at bearing position c: Thickness of power supply cap Is 0.3 mm and is arranged at a position 15 mm inside from the bearing. D: The thickness of the power supply cap is 0.8 mm and is arranged at a position 15 mm inside from the bearing. As can be seen from FIG. Even if the pressure is applied by the pressure roller 18 in a slightly wide range, the crushing amount is reduced. When the power supply cap 12 is located at the position of the bearing 20, the effect is small. When the thickness of the power supply cap 12 is set to be the same as the thickness of the core material 4 (d), the amount of crushing is further reduced, but the temperature of the end portion at the time of rising is about 40 degrees with respect to the central temperature control. It was confirmed that the temperature dropped by ° C., and in some cases, fixing defects occurred immediately after startup. For this reason, in the present invention, the average thickness of the power supply cap 12 is set to be equal to or less than the thickness of the core material 4 (claims 4 and 5).
【００１５】次に、図４乃至図５に基づいて他の実施例
を説明する。なお、上記実施例と同一部分は同一符号に
て示し（以下の例において同じ）、図１で示した絶縁層
８等は省略している。本実施例における自己発熱型定着
ローラ２２の特徴は、給電キャップ２４を給電部ホルダ
としての給電キャップホルダ２６で保持する点にある。
給電キャップ２４には、図５に示すように、中央部に芯
材４の軸方向外方に突出する給電接触部２４ａが絞り加
工等の手段によって形成されている。給電キャップホル
ダ２６は、非導電性で且つ耐熱性を有する材料で形成さ
れており、給電キャップ２４が嵌入される小径部２７
と、芯材４の端部に固定される大径部２８とから構成さ
れている。小径部２７には給電キャップ２４の給電接触
部２４ａを外方に露出させるための開口部２７ａが形成
されている。図５（ｃ）に示すように、給電キャップ２
４と給電キャップホルダ２６を組み付けた後、芯材４に
例えば焼ばめされ、固定される。図４に示すように、給
電キャップ２４を給電キャップホルダ２６で保持する構
成とした場合、給電キャップ２４を単独で固定する場合
に比べて、芯材４に対する姿勢を決める円筒側面２４ｂ
（発熱抵抗体層１０に対する接触部でもある）の長さが
実質的に長くなるので、すなわち、給電キャップホルダ
２６の大径部２８の側面２８ａが加わるので、給電キャ
ップ２４を斜めに取付けてしまうような製造上の誤差を
防止でき、品質精度の均一化、ひいては信頼性の均一化
を図ることができる。また、給電キャップ２４の給電接
触部２４ａに給電ブラシを接触させたときの摩耗粉が非
導電性の給電キャップホルダ２６内に溜まることになる
ので、摩耗粉の橋渡しによって芯材４と給電キャップ２
４との間が電気的にリークするなどの事故を防ぐことが
できる。また、給電接触部２４ａを突出させているの
で、給電キャップホルダ２６におけるローラ軸に垂直な
部分２７ｂに給電ブラシが当たって接触不良を起こすこ
とを防止することができる。かかる観点から、給電接触
部２４ａの突出量は、給電キャップホルダ２６の肉厚と
同等かそれ以上とするのが望ましい。また、この給電接
触部２４ａは給電キャップ２４自体の強度向上に寄与
し、給電キャップホルダ２６が無い場合においても給電
ブラシとの接触性が向上する（請求項６）。なお、本実
施例では、給電キャップ２４と給電キャップホルダ２６
を組み付けた段階でなお給電キャップ２４の円筒側面２
４ｂと、給電キャップホルダ２６の大径部２８の側面２
８ａとの間に段差を表示しているが、発熱抵抗体層１０
が薄い場合には、両者はほぼ面一となる。Next, another embodiment will be described with reference to FIGS. The same parts as those in the above embodiment are denoted by the same reference numerals (the same in the following examples), and the insulating layer 8 and the like shown in FIG. 1 are omitted. The feature of the self-heating type fixing roller 22 in the present embodiment is that the power supply cap 24 is held by a power supply cap holder 26 as a power supply unit holder.
As shown in FIG. 5, in the power supply cap 24, a power supply contact portion 24a protruding outward in the axial direction of the core member 4 is formed at a central portion by means such as drawing. The power supply cap holder 26 is formed of a non-conductive and heat-resistant material, and has a small diameter portion 27 into which the power supply cap 24 is fitted.
And a large-diameter portion 28 fixed to the end of the core 4. The small diameter portion 27 has an opening 27a for exposing the power supply contact portion 24a of the power supply cap 24 to the outside. As shown in FIG.
After the power supply cap holder 26 and the power supply cap holder 26 are assembled, the core material 4 is, for example, shrink-fitted and fixed. As shown in FIG. 4, when the power supply cap 24 is configured to be held by the power supply cap holder 26, the cylindrical side surface 24 b that determines the attitude with respect to the core member 4 is different from the case where the power supply cap 24 is fixed alone.
Since the length (which is also a contact portion with the heating resistor layer 10) becomes substantially long, that is, the side surface 28a of the large diameter portion 28 of the power supply cap holder 26 is added, the power supply cap 24 is attached obliquely. Such manufacturing errors can be prevented, and the quality accuracy can be made uniform, and the reliability can be made uniform. In addition, since the abrasion powder generated when the power supply brush is brought into contact with the power supply contact portion 24a of the power supply cap 24 accumulates in the non-conductive power supply cap holder 26, the core material 4 and the power supply cap 2 are formed by bridging the wear powder.
4 can be prevented from accidents such as electrical leakage. Further, since the power supply contact portion 24a is protruded, it is possible to prevent the power supply brush from hitting a portion 27b of the power supply cap holder 26 perpendicular to the roller axis and causing a contact failure. From this viewpoint, it is desirable that the amount of protrusion of the power supply contact portion 24a be equal to or greater than the thickness of the power supply cap holder 26. Further, the power supply contact portion 24a contributes to the improvement of the strength of the power supply cap 24 itself, and improves the contact with the power supply brush even when the power supply cap holder 26 is not provided. In this embodiment, the power supply cap 24 and the power supply cap holder 26
At the stage when the power supply cap 24 is assembled.
4b and the side surface 2 of the large diameter portion 28 of the power supply cap holder 26.
8a is shown between the heating resistor layer 10
When are thin, both are almost flush.
【００１６】図６は給電キャップホルダ２６の変形例を
示すものである。本実施例における給電キャップホルダ
２６は、上記構成に加え、芯材４への挿入方向後端側に
芯材４の径方向に突出するストッパ２９を備えている。
給電キャップ２４が嵌入された給電キャップホルダ２６
を芯材４に挿入した場合、ストッパ２９が芯材４の端面
に突き当たり、これによって芯材４に対する給電キャッ
プ２４の位置決めがなされる。従って、給電キャップ２
４の挿入のしすぎを防止でき、換言すれば、芯材４の両
端部における給電キャップ２４の位置のバッラツキを抑
えることができ、品質精度の均一化を図ることができる
（請求項７）。ストッパ２９の形状は環状でもよく、部
分的でもよい。また、ストッパ２９の径方向への突出量
は、芯材４の外径より突出しない大きさに設定されてお
り、軸受２０の挿入に支障を来さないようになっている
（請求項８）。FIG. 6 shows a modification of the power supply cap holder 26. The power supply cap holder 26 according to the present embodiment includes, in addition to the above-described configuration, a stopper 29 that protrudes in the radial direction of the core 4 at the rear end side in the insertion direction into the core 4.
Power supply cap holder 26 into which power supply cap 24 is fitted
Is inserted into the core 4, the stopper 29 abuts against the end face of the core 4, thereby positioning the power supply cap 24 with respect to the core 4. Therefore, the power supply cap 2
4 can be prevented from being inserted too much, in other words, the variation in the position of the power supply cap 24 at both ends of the core member 4 can be suppressed, and the quality accuracy can be made uniform (claim 7). The shape of the stopper 29 may be annular or partial. The amount of protrusion of the stopper 29 in the radial direction is set to a size that does not protrude from the outer diameter of the core member 4 so as not to hinder the insertion of the bearing 20 (claim 8). .
【００１７】次に、図７及び図８に基づいて、給電キャ
ップ２４と給電キャップホルダ２６のさらに他の変形例
を説明する。本実施例における給電キャップ２６と給電
キャップ２４は射出成形等の手段で一体成形されるもの
で、図７に示すように、小径部２７には給電キャップ２
４を一体結合するための抜け止め部２７ｂが存在する。
給電キャップ２４には、図８に示すように、芯材４の軸
心に対して垂直な面２４ｃにおいて、軸心回りに（軸心
対称に）３個の開口部２４ｄが形成されており、給電キ
ャップホルダ２６の樹脂材料がこの開口部２４ｄに入り
込んで抜け止め部２７ｂが形成される。このように、給
電キャップ２４と給電キャップホルダ２６を一体的に形
成することにより、給電キャップ２４と給電キャップホ
ルダ２６の相対位置精度を向上させることができる。ま
た、給電キャップ２４の垂直面２４ｃに開口部２４ｄを
形成して結合する構成とした場合、給電キャップ２４の
発熱抵抗体層１０と接触する部分、すなわち、円筒側面
２４ｂに給電キャップホルダ２６と一体化するための加
工を施す必要がないので、発熱抵抗体層１０のみとの接
触を加工時に気を付ければよく、よって部品加工が容易
になる。また、円筒側面２４ｂに加工する場合に比べて
給電キャップホルダ２６との一体化強度を高くすること
ができるため、給電ブラシで軸方向に押圧しても耐久性
が保たれるメリットがある。ただし、給電キャップ２４
の中央部に給電ブラシを当てるため、開口部２４ｄは軸
心に対して対称に３か所以上あることが望ましい（請求
項９，１０）。Next, another modification of the power supply cap 24 and the power supply cap holder 26 will be described with reference to FIGS. In the present embodiment, the power supply cap 26 and the power supply cap 24 are integrally formed by means such as injection molding, and as shown in FIG.
4 is provided with a retaining portion 27b for integrally connecting the components.
As shown in FIG. 8, the power supply cap 24 has three openings 24d formed around the axis (symmetrically with respect to the axis) on a surface 24c perpendicular to the axis of the core member 4. The resin material of the power supply cap holder 26 enters the opening 24d to form a retaining portion 27b. In this way, by forming the power supply cap 24 and the power supply cap holder 26 integrally, the relative positional accuracy between the power supply cap 24 and the power supply cap holder 26 can be improved. When the opening 24d is formed on the vertical surface 24c of the power supply cap 24 and connected to the power supply cap 24, the portion of the power supply cap 24 that contacts the heating resistor layer 10, that is, the cylindrical side surface 24b is integrated with the power supply cap holder 26. Since it is not necessary to perform a process for forming the component, it is only necessary to pay attention to the contact with the heating resistor layer 10 at the time of the process, thereby facilitating the component processing. Further, since the integrated strength with the power supply cap holder 26 can be increased as compared with the case where the cylindrical side surface 24b is machined, there is an advantage that the durability can be maintained even when the power supply brush presses in the axial direction. However, the power supply cap 24
It is desirable that the opening 24d be provided at three or more positions symmetrically with respect to the axis in order to apply the power supply brush to the central portion of the power supply brush (claims 9 and 10).
【００１８】図９は、図６で示した自己発熱型定着ロー
ラに給電ブラシを当てた状態を示す概要図である。給電
ブラシ３０はブラシホルダ３２に保持されて給電キャッ
プ２４の給電接触部２４ａに対向されており、ブラシホ
ルダ３２に収容されたスプリング３４によって給電接触
部２４ａに圧接されている。また、給電ブラシ３０はハ
ーネス３４を介して交流３８に接続されている。さらに
具体的に説明すると、給電ブラシ３０はローラの軸心位
置をもって給電接触部２４ａに接触している。このよう
に、ローラの軸心を含むように給電ブラシ３０を押し当
てると、給電ブラシ３０の走行距離を短くでき、耐久性
が向上することは知られているが、この種の自己発熱型
定着ローラにおいては、さらに、ローラ表面から給電ブ
ラシ３０までの距離を最も長く取れるため、給電ブラシ
３０を介した放熱を防ぎやすい。但し、給電ブラシ３０
の径がローラ内径（厳密には芯材４の内径）に対して大
きすぎればその効果はない。実験によれば、内径２８．
８ｍｍ、外径３０ｍｍの芯材４で、径が９．５ｍｍの給
電ブラシ３０を使った場合では、径が４ｍｍの給電ブラ
シ３０で通電を行った場合に比べて、ローラ端部温度の
低下は５℃以下であったが、径が１４ｍｍの給電ブラシ
３０を用いたときには、１０℃以上のローラ端部温度の
低下が確認された。この種の定着ローラの温度制御の制
御誤差は、±５℃程度であり、５℃程度の誤差レベルは
問題にならない。同様の確認を内径１８ｍｍ、径６ｍｍ
の給電ブラシ３０で行ったが、これも同様の結果となっ
た。FIG. 9 is a schematic diagram showing a state in which a power supply brush is applied to the self-heating type fixing roller shown in FIG. The power supply brush 30 is held by the brush holder 32 and faces the power supply contact portion 24a of the power supply cap 24, and is pressed against the power supply contact portion 24a by a spring 34 housed in the brush holder 32. The power supply brush 30 is connected to an AC 38 via a harness 34. More specifically, the power supply brush 30 is in contact with the power supply contact portion 24a at the axial position of the roller. It is known that when the power supply brush 30 is pressed so as to include the axis of the roller, the traveling distance of the power supply brush 30 can be shortened and the durability is improved. In the roller, since the distance from the roller surface to the power supply brush 30 is the longest, heat radiation via the power supply brush 30 can be easily prevented. However, the power supply brush 30
If the diameter is too large with respect to the inner diameter of the roller (strictly, the inner diameter of the core member 4), the effect is not obtained. Experiments have shown that the inner diameter 28.
When the power supply brush 30 having a diameter of 9.5 mm is used with the core material 4 having a diameter of 8 mm and an outer diameter of 30 mm, the temperature at the roller end is lower than when the power supply brush 30 is supplied with a diameter of 4 mm. Although the temperature was 5 ° C. or less, when the power supply brush 30 having a diameter of 14 mm was used, a decrease in the roller end temperature of 10 ° C. or more was confirmed. The control error of this type of fixing roller temperature control is about ± 5 ° C., and the error level of about 5 ° C. does not matter. The same confirmation was performed for an inner diameter of 18 mm and a diameter of 6 mm.
, And the same result was obtained.
【００１９】[0019]
【発明の効果】請求項１記載の発明によれば、発熱抵抗
体層の両端部を芯材の長手方向内側になる長さとし、且
つ、発熱抵抗体層に接触する内蓋状の給電部を芯材の端
部より内方に設ける構成としたので、薄肉化した芯材を
用いてもつぶれにくく、立ち上がりスピードを上げら
れ、さらに加圧力も上げられるので、プリントスピード
を上げることが容易となる。また、給電部を芯材の軸心
上に配置できるため、給電ブラシの走行距離を短くする
ことができ、安定した給電を行うことができる。さらに
ローラ内部からの放熱を給電部により新たな構成を付加
することなく抑制できるため、安価にエネルギー効率を
上げることができる。また、給電部に給電ブラシを押し
付けて給電する場合でも、給電部が芯材の内側に位置す
るため、摩耗粉がローラ端部に止まり、装置内部や定着
ローラ表面、加圧ローラ表面が汚染されるのを抑制でき
る。According to the first aspect of the present invention, both ends of the heating resistor layer have a length inward in the longitudinal direction of the core material, and the inner lid-like power feeding portion that contacts the heating resistor layer is provided. Since it is configured to be provided inward from the end of the core material, it is difficult to crush using a thinned core material, the rising speed can be increased, and the pressing force can be increased, so that the printing speed can be easily increased. . In addition, since the power supply unit can be arranged on the axis of the core material, the traveling distance of the power supply brush can be shortened, and stable power supply can be performed. Further, since the heat radiation from the inside of the roller can be suppressed without adding a new configuration by the power supply unit, energy efficiency can be increased at low cost. Also, even when the power supply brush is pressed against the power supply unit to supply power, the power supply unit is located inside the core material, so that abrasion powder stops at the roller end, and the inside of the apparatus, the surface of the fixing roller, and the surface of the pressure roller are contaminated. Can be suppressed.
【００２０】請求項２記載の発明によれば、請求項１の
基本効果に加え、給電部の固定を焼ばめ方式としたの
で、長期的に劣化しにくい固定状態を得ることができ
る。また、接着剤を使用しないため、信頼性の向上を図
ることができるとともに、低コストとすることができ
る。請求項３記載の発明によれば、焼ばめ工程における
芯材を加熱する工程は、ローラ製造工程の一つとしたの
で、請求項２記載の効果に加え、給電部を固定するため
の工程数を極力減らすことができる。請求項４記載の発
明によれば、給電部の芯材に対する配置位置を、最大通
紙幅の外側で、且つ、軸受より内側としたので、請求項
１又は２の効果に加え、給電部の補強機能によって芯材
をつぶれにくくすることができるとともに、芯材端部に
おける部品集中回避構成によって端部温度の低下を抑制
することができる。According to the second aspect of the invention, in addition to the basic effect of the first aspect, since the fixing of the power supply section is performed by a shrink fit method, it is possible to obtain a fixed state that is hardly deteriorated in a long term. Further, since no adhesive is used, the reliability can be improved and the cost can be reduced. According to the third aspect of the present invention, the step of heating the core material in the shrink-fitting step is one of the roller manufacturing steps. Can be reduced as much as possible. According to the fourth aspect of the present invention, the position of the power supply unit with respect to the core material is located outside the maximum sheet passing width and inside the bearing, so that the power supply unit is reinforced in addition to the effects of the first or second aspect. The function makes it possible to prevent the core material from being crushed easily, and the component concentration avoiding structure at the end portion of the core material can suppress a decrease in end temperature.
【００２１】請求項５記載の発明によれば、給電部の平
均肉厚を芯材の肉厚以下としたので、請求項１又は２の
効果に加え、芯材をつぶれにくくすることができるとと
もに、芯材端部の温度低下を抑制することができる。請
求項６記載の発明によれば、給電部を非導電性で耐熱性
の給電部ホルダで保持する構成としたので、請求項１又
は２の効果に加え、給電部の取付性を向上させることが
できるとともに、芯材を導電性材料で形成しても給電端
子と芯材との絶縁性、及び給電ブラシの摩耗粉による給
電部と芯材との絶縁性を確保することができる。According to the fifth aspect of the present invention, the average thickness of the power supply portion is set to be equal to or less than the thickness of the core material. Therefore, in addition to the effects of the first and second aspects, the core material can be hardly crushed. In addition, it is possible to suppress a decrease in temperature at the end of the core material. According to the sixth aspect of the present invention, since the power supply section is held by the non-conductive and heat-resistant power supply section holder, in addition to the effects of the first or second aspect, the mounting property of the power supply section is improved. In addition, even if the core member is formed of a conductive material, the insulation between the power supply terminal and the core member and the insulation between the power supply portion and the core member due to abrasion powder of the power supply brush can be ensured.
【００２２】請求項７記載の発明によれば、給電部ホル
ダに挿入位置を規制するストッパを設ける構成としたの
で、請求項６記載の効果に加え、芯材に対する給電部の
取付位置精度を均一化することができ、製品品質の均一
化を図ることができる。請求項８記載の発明によれば、
ストッパが芯材の外径より突出しない構成としたので、
請求項７記載の効果に加え、ローラ端部を軸受に支障な
く挿入することができる。請求項９記載の発明によれ
ば、給電部と給電部ホルダとを一体的に成形する構成と
したので、請求項６記載の効果に加え、給電部と給電部
ホルダとの組み付け精度を向上さることができるととも
に、両者を安定的に且つ安価に固定することができる。According to the seventh aspect of the present invention, since the stopper for regulating the insertion position is provided in the power supply section holder, in addition to the effect of the sixth aspect, the accuracy of the mounting position of the power supply section with respect to the core material is uniform. And product quality can be made uniform. According to the invention described in claim 8,
Since the stopper does not protrude from the outer diameter of the core material,
In addition to the effect of claim 7, the roller end can be inserted into the bearing without any trouble. According to the ninth aspect of the present invention, since the power supply unit and the power supply unit holder are integrally formed, the assembly accuracy of the power supply unit and the power supply unit holder is improved in addition to the effect of the sixth aspect. And both can be stably and inexpensively fixed.
【００２３】請求項１０記載の発明によれば、給電部に
おける芯材の軸心に対して垂直な面に、軸心回りに３個
以上の開口部を形成し、該開口部に給電部ホルダの一部
を嵌合する一体的構成としたので、請求項９記載の効果
に加え、給電部の円筒側面に給電部ホルダとの固定用の
加工をする必要がなく、よって給電部と発熱抵抗体層と
を良好に接触させることができ、且つ、給電部と給電部
ホルダを安定的に固定することができる。請求項１１記
載の発明によれば、給電部に対する本体側からの給電
は、ローラの両端側よりその軸方向内方に向かって、ロ
ーラ軸心を含む部分に対して摺動可能な給電端子を押し
当てる構成であって、該給電端子と前記給電部の接触面
が前記芯材の内径の１／３以下の大きさである構成とし
たので、給電端子からの放熱を極力抑えることができ、
よって、エネルギー効率の向上を図ることができる。According to the tenth aspect of the present invention, three or more openings are formed around the axis in a plane perpendicular to the axis of the core material in the power supply part, and the power supply part holder is formed in the opening. Is integrated, so that in addition to the effect of the ninth aspect, there is no need to perform processing for fixing the power supply unit to the power supply unit holder on the cylindrical side surface of the power supply unit. The body layer can be satisfactorily brought into contact with the body layer, and the power supply unit and the power supply unit holder can be stably fixed. According to the eleventh aspect of the present invention, the power supply from the main body side to the power supply unit is performed by using a power supply terminal slidable toward a portion including the roller axis from both ends of the roller toward the inside in the axial direction. Since the contact surface between the power supply terminal and the power supply unit has a size of 1/3 or less of the inner diameter of the core material, heat radiation from the power supply terminal can be suppressed as much as possible.
Therefore, energy efficiency can be improved.
【図１】本発明に係る自己発熱型定着ローラの一実施例
を示す概要断面図である。FIG. 1 is a schematic sectional view showing an embodiment of a self-heating type fixing roller according to the present invention.
【図２】本発明に係る定着装置の一実施例を示す概要断
面図である。FIG. 2 is a schematic sectional view showing one embodiment of a fixing device according to the present invention.
【図３】給電キャップとローラのつぶれ量との関係を示
すグラフである。FIG. 3 is a graph showing a relationship between a power supply cap and a crush amount of a roller.
【図４】本発明に係る自己発熱型定着ローラの他の実施
例を示す要部断面図である。FIG. 4 is a sectional view of a main part showing another embodiment of the self-heating type fixing roller according to the present invention.
【図５】図４で示した実施例における組立図で、（ａ）
は分解斜視図、（ｂ）はその断面図、（ｃ）は給電キャ
ップと給電キャップホルダを組み付けた状態の断面図で
ある。FIG. 5 is an assembly view of the embodiment shown in FIG.
2 is an exploded perspective view, FIG. 2B is a cross-sectional view thereof, and FIG. 2C is a cross-sectional view of a state where a power supply cap and a power supply cap holder are assembled.
【図６】図４で示した実施例における給電キャップホル
ダの変形例を示す要部断面図である。FIG. 6 is a sectional view of a main part showing a modification of the power supply cap holder in the embodiment shown in FIG. 4;
【図７】図４で示した実施例における給電キャップホル
ダの他の変形例と給電キャップの変形例との組合せを示
す断面図である。FIG. 7 is a sectional view showing a combination of another modification of the power supply cap holder and a modification of the power supply cap in the embodiment shown in FIG. 4;
【図８】図７で示した給電キャップを示す図で、（ａ）
は正面図、（ｂ）は断面図である。FIG. 8 is a view showing the power supply cap shown in FIG. 7;
Is a front view, and (b) is a sectional view.
【図９】図６で示した自己発熱型定着ローラに給電ブラ
シを当てた状態の要部断面図である。9 is a cross-sectional view of a main part in a state where a power supply brush is applied to the self-heating type fixing roller shown in FIG. 6;
【図１０】従来の定着装置の一例を示す斜視図である。FIG. 10 is a perspective view illustrating an example of a conventional fixing device.
４ 芯材 ６ 離形層 １０ 発熱抵抗体層 １２，２４ 給電部としての給電キャップ ２０ 軸受 ２４ｃ 開口部 ２６ 給電部ホルダとしての給電キャップホルダ ２９ ストッパ Reference Signs List 4 core material 6 release layer 10 heating resistor layer 12, 24 power supply cap as power supply section 20 bearing 24c opening 26 power supply cap holder as power supply section holder 29 stopper
Claims (11)
成された自己発熱型定着ローラにおいて、 前記発熱抵抗体層はその両側の端部が前記芯材の長手方
向の内側になる長さに形成され、内蓋状をなす導電性の
給電部が前記芯材の両端部から挿入されて前記発熱抵抗
体層の両端部に接触され、且つ、該導電性の給電部は前
記芯材の端部より長手方向の内側に位置するように設け
られていることを特徴とする自己発熱型定着ローラ。1. A self-heating type fixing roller in which a heating resistor layer is formed on an inner peripheral surface of a cylindrical core material, wherein both ends of the heating resistor layer are inside a longitudinal direction of the core material. And a conductive power supply part in the form of an inner lid is inserted from both ends of the core material and is in contact with both ends of the heating resistor layer, and the conductive power supply part is A self-heating type fixing roller, which is provided so as to be located inside of an end of the core material in a longitudinal direction.
抵抗体層を含む芯材に温度差を付けた状態で嵌合して固
定する焼ばめであることを特徴とする請求項１記載の自
己発熱型定着ローラ。2. The shrink fit of fixing the power supply portion by fitting and fixing the power supply portion and a core material including the heating resistor layer with a temperature difference therebetween. 2. The self-heating type fixing roller according to 1.
る工程は、該芯材の外周面に離形層を形成する工程、も
しくは内周面に発熱抵抗体層を形成する工程であって、
これらいずれかの工程の直後、又はその工程内に、前記
芯材に対して低温の前記給電部を挿入することを特徴と
する請求項２記載の自己発熱型定着ローラの製造方法。3. The step of heating the core in the shrink-fitting step is a step of forming a release layer on an outer peripheral surface of the core or a step of forming a heating resistor layer on an inner peripheral surface of the core. hand,
The method of manufacturing a self-heating type fixing roller according to claim 2, wherein the power supply unit having a low temperature is inserted into the core material immediately after or during any one of these steps.
ラを用いる定着装置において、前記給電部の前記芯材に
対する配置位置は、最大通紙幅の外側で、且つ、前記自
己発熱型定着ローラを保持する軸受より内側であること
を特徴とする定着装置。4. A fixing device using a self-heating type fixing roller according to claim 1, wherein a position of the power supply portion with respect to the core material is outside a maximum sheet passing width and the self-heating type fixing roller. A fixing device, which is located inside a bearing for holding the fixing member.
下であることを特徴とする請求項１又は２記載の自己発
熱型定着ローラ。5. The self-heating type fixing roller according to claim 1, wherein an average thickness of the power supply portion is equal to or less than a thickness of the core material.
りなる給電部ホルダにより保持されて前記芯材の両端か
ら挿入され、固定されることを特徴とする請求項１又は
２記載の自己発熱型定着ローラ。6. The power supply unit according to claim 1, wherein the power supply unit is held by a power supply unit holder made of a non-conductive and heat-resistant material, inserted from both ends of the core material, and fixed. Self-heating type fixing roller.
向後端側の少なくとも一部に芯材の径方向に突出するス
トッパを有していることを特徴とする請求項６記載の自
己発熱型定着ローラ。7. The power supply unit holder according to claim 6, wherein a stopper protruding in a radial direction of the core material is provided on at least a part of a rear end side in a direction of insertion into the core material. Self-heating type fixing roller.
しない大きさであることを特徴とする請求項７記載の自
己発熱型定着ローラ。8. The self-heating type fixing roller according to claim 7, wherein said stopper has a size not protruding from an outer diameter of said core material.
体的に形成されることを特徴とする請求項６記載の自己
発熱型定着ローラ。9. The self-heating type fixing roller according to claim 6, wherein the power supply unit holder is formed integrally with the power supply unit.
して垂直な面に、軸心回りに３個以上の開口部が形成さ
れ、該開口部に前記給電部ホルダの一部が嵌合するよう
に固定されていることを特徴とする請求項９記載の自己
発熱型定着ローラ。10. A power supply unit in which a surface perpendicular to the axis of the core material has three or more openings formed around the axis, and a part of the power supply unit holder is fitted in the opening. The self-heating type fixing roller according to claim 9, wherein the fixing roller is fixed so as to fit.
ーラを用いる定着装置において、前記給電部に対する本
体側からの給電は、ローラの両端側よりその軸方向内方
に向かって、ローラ軸心を含む部分に対して摺動可能な
給電端子を押し当てる構成であって、該給電端子と前記
給電部の接触面が前記芯材の内径の１／３以下の大きさ
であることを特徴とする定着装置。11. A fixing device using a self-heating type fixing roller according to claim 1, wherein power is supplied to said power supply portion from a main body side from both ends of the roller toward a shaft inside thereof. A configuration in which a slidable power supply terminal is pressed against a portion including a core, wherein a contact surface between the power supply terminal and the power supply unit has a size of 1/3 or less of an inner diameter of the core material. Fixing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP663397A JPH10207267A (en) | 1997-01-17 | 1997-01-17 | Self-heating type fixing roller, manufacture thereof, and fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP663397A JPH10207267A (en) | 1997-01-17 | 1997-01-17 | Self-heating type fixing roller, manufacture thereof, and fixing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10207267A true JPH10207267A (en) | 1998-08-07 |
Family
ID=11643777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP663397A Pending JPH10207267A (en) | 1997-01-17 | 1997-01-17 | Self-heating type fixing roller, manufacture thereof, and fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10207267A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0881550A2 (en) * | 1997-05-30 | 1998-12-02 | Kyocera Corporation | Heating roller for fixing |
-
1997
- 1997-01-17 JP JP663397A patent/JPH10207267A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0881550A2 (en) * | 1997-05-30 | 1998-12-02 | Kyocera Corporation | Heating roller for fixing |
| EP0881550A3 (en) * | 1997-05-30 | 1999-10-06 | Kyocera Corporation | Heating roller for fixing |
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