JPH07295418A - Pressure roller and manufacture thereof - Google Patents
Pressure roller and manufacture thereofInfo
- Publication number
- JPH07295418A JPH07295418A JP6111780A JP11178094A JPH07295418A JP H07295418 A JPH07295418 A JP H07295418A JP 6111780 A JP6111780 A JP 6111780A JP 11178094 A JP11178094 A JP 11178094A JP H07295418 A JPH07295418 A JP H07295418A
- Authority
- JP
- Japan
- Prior art keywords
- pressure roller
- hole
- elastic layer
- recording material
- roller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Fixing For Electrophotography (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、複写機、レーザビーム
プリンタ、ファクシミリ、マイクロフィルムリーダプリ
ンタ、記録機等の画像形成装置の定着装置に使用される
加圧ローラに関するものであり、さらに詳しくは、電子
写真、静電記録、磁気記録等の適宜の画像形成プロセス
手段により加熱溶融性の樹脂等よりなるトナーを用いて
記録材（エレクトロファックスシート、静電記録シー
ト、転写材シート、印刷紙等）の面に直接方式もしくは
間接（転写）方式で目的の画像情報に対応した未定着の
トナー画像を形成担持させ、発熱手段により加熱された
被加熱部材と、上記被加熱部材に圧接させた加圧ローラ
とにより、記録材を挟持搬送しつつ熱エネルギーと圧力
を付与し、該未定着のトナー画像を該画像を担持してい
る記録材面に永久固着画像として加熱定着処理する方式
の画像形成装置の定着装置に使用される加圧ローラに関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure roller used in a fixing device of an image forming apparatus such as a copying machine, a laser beam printer, a facsimile, a micro film reader printer, a recording machine, and the like. A recording material (electrofax sheet, electrostatic recording sheet, transfer material sheet, printing paper, etc.) using a toner made of a heat-meltable resin by an appropriate image forming process means such as electrophotography, electrostatic recording, magnetic recording, etc. ) Surface is used to form and carry an unfixed toner image corresponding to the target image information by a direct method or an indirect (transfer) method, and a heated member heated by a heat generating means and a heating member pressed against the heated member. The pressure roller applies heat energy and pressure while nipping and conveying the recording material to permanently fix the unfixed toner image on the surface of the recording material carrying the image. It relates the pressure roller used in the fixing device of the image forming apparatus of a type for heating and fixing processing as an image.
【０００２】[0002]
【従来の技術】近年、電子写真複写機等の小型化、軽量
化に伴って、その定着装置用ローラの小型化、軽量化が
進んでいる。例えば、小型化した場合でもローラ表面の
硬度が低く、熱定着に必要なニップ幅を十分にとること
ができる加圧ローラとして、特開平２−２８２２８３号
公報に開示されているものがある。2. Description of the Related Art In recent years, with downsizing and weight reduction of electrophotographic copying machines and the like, downsizing and weight reduction of rollers for fixing devices have been advanced. For example, there is a pressure roller disclosed in Japanese Patent Application Laid-Open No. 2-228283 as a pressure roller which has a low hardness on the surface of the roller even when it is downsized and can sufficiently secure a nip width necessary for heat fixing.
【０００３】このローラは、例えば図７に示すように、
芯金１上にシリコーンゴム等の発泡スポンジからなる弾
性層２を有したもので、該弾性層２上にはＰＦＡチュー
ブ等の離型層３が設けられ、また、該弾性層２には貫通
孔４が設けられている。This roller is, for example, as shown in FIG.
A cored bar 1 having an elastic layer 2 made of foamed sponge such as silicone rubber. A release layer 3 such as a PFA tube is provided on the elastic layer 2, and the elastic layer 2 is penetrated. A hole 4 is provided.
【０００４】このように弾性層２中に貫通孔４を有する
ような加圧ローラは、上記特開平２−２８２２８３号公
報に開示されているように、押出機のダイの構造を変化
させる（ピンを設ける）ことにより、空孔を有した原料
ゴムチューブを押出成形して、これに熱を加えて加硫発
泡させスポンジチューブを作り、この中に芯金を装着
し、これに予め成形してあるＰＦＡチューブを嵌め込む
ことにより形成している。The pressure roller having the through hole 4 in the elastic layer 2 changes the structure of the die of the extruder as disclosed in the above-mentioned Japanese Patent Laid-Open No. 2-228283 (pin). By forming a sponge tube, the raw material rubber tube with pores is extruded, and heat is applied to this to vulcanize and foam to form a sponge tube. It is formed by fitting a certain PFA tube.
【０００５】この加圧ローラの製造方法によれば、貫通
孔を設けることにより、加熱膨張時の外径の増大化が小
さく、均一なローラを提供することができ、従って、紙
皺等の発生を防ぐことができる。According to this manufacturing method of the pressure roller, by providing the through hole, it is possible to provide a uniform roller with a small increase in the outer diameter at the time of heating and expansion, and thus to generate paper wrinkles and the like. Can be prevented.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記従
来例では、以下のような問題点があった。先ず、貫通孔
位置が加圧ローラ表面に近い場合、圧接された加圧ロー
ラと加熱ローラ等の被加熱部材とで形成されるニップ部
において、貫通孔のある加圧ローラ周方向位置と貫通孔
のない周方向位置とでは、圧力が異なり、貫通孔のある
位置はない位置に比べて圧力が小さくなってしまう。こ
のため、貫通孔のある位置とない位置とで定着強度に差
ができ、ベタ黒画像等のベタ画像では、貫通孔のない位
置に比べて定着後画像の光沢が少なくなってしまう。従
って、定着後画像に光沢のムラが生じてしまう問題があ
った。However, the above-mentioned conventional example has the following problems. First, when the position of the through hole is close to the surface of the pressure roller, in the nip portion formed by the pressure roller pressed against and the heated member such as the heating roller, the circumferential position of the pressure roller having the through hole and the through hole. The pressure is different from the position in the circumferential direction where there is no hole, and the pressure becomes smaller than the position where there is no through hole. For this reason, there is a difference in the fixing strength between the position with the through hole and the position without the through hole, and in a solid image such as a solid black image, the gloss of the fixed image becomes smaller than that in the position without the through hole. Therefore, there is a problem that uneven glossiness occurs in the image after fixing.
【０００７】この問題は、加圧ローラの圧接力が大き
く、加圧ローラ変形量が大きい場合、及び貫通孔が大き
い場合にも同様に発生し、特に、加圧ローラ硬度が低い
場合に発生し易かった。This problem also occurs when the pressure contact force of the pressure roller is large, the deformation amount of the pressure roller is large, and the through hole is large, and particularly when the hardness of the pressure roller is low. It was easy.
【０００８】また、貫通孔と最近接の貫通孔との間のゴ
ム肉厚が小さい場合、ローラを長時間使用した場合のゴ
ム破断等が発生する問題があった。Further, when the rubber wall thickness between the through hole and the closest through hole is small, there is a problem that rubber breakage occurs when the roller is used for a long time.
【０００９】さらに、従来のローラは、押出機で貫通孔
を設けた状態で押し出した後、加硫発泡させるため、発
泡時に貫通孔の大きさも大きくなってしまうため、小さ
い貫通孔を形成することが難しかった。特に、ローラ硬
度の低い加圧ローラでは、スポンジ層の発泡等が大きい
ため、小さい貫通孔を形成することが難しかった。Further, since the conventional roller is vulcanized and foamed after being extruded in a state where the through hole is provided by the extruder, the size of the through hole becomes large at the time of foaming. Therefore, it is necessary to form a small through hole. Was difficult. In particular, in a pressure roller having a low roller hardness, it is difficult to form a small through hole because the foaming of the sponge layer is large.
【００１０】そこで、本出願に係る第１の発明は、上記
問題点を解決し、貫通孔を設けた場合でも、光沢ムラを
発生させることのない加圧ローラを提供することを目的
としている。Therefore, a first invention of the present application is to solve the above problems and to provide a pressure roller which does not cause uneven gloss even when a through hole is provided.
【００１１】また、本出願に係る第２の発明は、上記問
題点を解決し、貫通孔を設けた場合でも、ゴム破断を発
生させることのない加圧ローラを提供することを目的と
している。Another object of the present invention is to solve the above-mentioned problems and to provide a pressure roller which does not cause rubber breakage even when a through hole is provided.
【００１２】さらに、本出願に係る第３の発明は、上記
問題点を解決し、貫通孔を設けた場合でも、加圧ローラ
の変形量が少なく、長時間使用した場合のローラ硬度の
低下、ゴム破断、ＰＦＡチューブの剥れ、チューブ皺等
の不具合を発生させることのない加圧ローラを提供する
ことを目的としている。Further, the third invention according to the present application solves the above-mentioned problems, the deformation of the pressure roller is small even when the through hole is provided, and the roller hardness is reduced when used for a long time. It is an object of the present invention to provide a pressure roller that does not cause problems such as rubber breakage, PFA tube peeling, and tube wrinkling.
【００１３】また、本出願に係る第４の発明は、上記問
題点を解決し、貫通孔を設けた場合でも、弾性層に係る
ストレスを小さくして、長時間使用した場合でも、ロー
ラ硬度の低下、ゴム破断等を発生させることのない加圧
ローラを提供することを目的としている。The fourth invention according to the present application solves the above-mentioned problems and reduces the roller hardness even when a through hole is provided and the stress applied to the elastic layer is reduced, and even when the roller is used for a long time. It is an object of the present invention to provide a pressure roller that does not cause deterioration or rubber breakage.
【００１４】さらに、本出願に係る第５の発明は、上記
問題点を解決しつつ、適切なニップ幅を得ることのでき
る加圧ローラを提供することを目的としている。A fifth object of the present invention is to provide a pressure roller capable of obtaining an appropriate nip width while solving the above problems.
【００１５】また、本出願に係る第６の発明は、上記問
題点を解決し、貫通孔を小さくすることのできる加圧ロ
ーラの製造方法を提供することを目的としている。Another object of the sixth invention of the present application is to solve the above-mentioned problems and to provide a method of manufacturing a pressure roller capable of reducing the size of the through hole.
【００１６】[0016]
【課題を解決するための手段】本出願に係る第１の発明
によれば、上記目的は、芯金の上に弾性層と離型層を順
次形成し、該弾性層中に、該芯金の長手方向に略平行
で、該芯金の周方向の複数箇所に設けられた貫通孔を有
する加圧ローラであって、加熱手段により加熱された被
加熱部材に圧接されるように配設され、該被加熱部材と
の圧接部にて記録材を挟持搬送しつつ、記録材上の未定
着画像を記録材へ定着させる画像形成装置の定着装置に
使用される加圧ローラにおいて、上記加圧ローラ表面と
上記貫通孔との距離を、３ｍｍ以上に設定することによ
り達成される。According to the first invention of the present application, an object of the above is to form an elastic layer and a release layer in sequence on a cored bar, and to form the cored bar in the elastic layer. Is a pressure roller having through holes provided at a plurality of positions in the circumferential direction of the core metal, which are substantially parallel to the longitudinal direction of the core metal, and are arranged so as to be pressed against a member to be heated heated by a heating means. A pressure roller used in a fixing device of an image forming apparatus for fixing an unfixed image on a recording material to the recording material while nipping and conveying the recording material at a pressure contact portion with the heated member. This is achieved by setting the distance between the roller surface and the through hole to 3 mm or more.
【００１７】また、本出願に係る第２の発明によれば、
上記目的は、芯金の上に弾性層と離型層を順次形成し、
該弾性層中に、該芯金の長手方向に略平行で、該芯金の
周方向の複数箇所に設けられた貫通孔を有する加圧ロー
ラであって、加熱手段により加熱された被加熱部材に圧
接されるように配設され、該被加熱部材との圧接部にて
記録材を挟持搬送しつつ、記録材上の未定着画像を記録
材へ定着させる画像形成装置の定着装置に使用される加
圧ローラにおいて、最も近接する上記貫通孔間の上記弾
性層の厚さを、２ｍｍ以上に設定することにより達成さ
れる。According to the second invention of the present application,
The above-mentioned purpose is to sequentially form an elastic layer and a release layer on the core metal,
A pressure roller having through-holes in the elastic layer, which are substantially parallel to the longitudinal direction of the cored bar and are provided at a plurality of circumferential positions of the cored bar, the member being heated by a heating means. It is used for a fixing device of an image forming apparatus for fixing an unfixed image on a recording material to a recording material while sandwiching and transporting the recording material at a pressure contact portion with the heated member. In the pressure roller according to the present invention, it is achieved by setting the thickness of the elastic layer between the closest through holes to 2 mm or more.
【００１８】さらに、本出願に係る第３の発明によれ
ば、上記目的は、芯金の上に弾性層と離型層を順次形成
し、該弾性層中に、該芯金の長手方向に略平行で、該芯
金の周方向の複数箇所に設けられた貫通孔を有する加圧
ローラであって、加熱手段により加熱された被加熱部材
に圧接されるように配設され、該被加熱部材との圧接部
にて記録材を挟持搬送しつつ、記録材上の未定着画像を
記録材へ定着させる画像形成装置の定着装置に使用され
る加圧ローラにおいて、上記加圧ローラの変形量ｉと、
上記弾性層の厚さｔとの比の値ｉ／ｔを、０．０３以下
に設定することにより達成される。Further, according to the third invention of the present application, the above-mentioned object is to form an elastic layer and a release layer on a core metal in sequence, and to arrange in the elastic layer in the longitudinal direction of the core metal. A pressure roller which is substantially parallel and has through holes provided at a plurality of circumferential positions of the core metal, the pressure roller being arranged so as to be in pressure contact with a member to be heated heated by a heating means. In a pressure roller used in a fixing device of an image forming apparatus for fixing an unfixed image on a recording material to the recording material while nipping and conveying the recording material at a pressure contact portion with a member, the deformation amount of the pressure roller. i,
This is achieved by setting the value i / t of the ratio to the thickness t of the elastic layer to 0.03 or less.
【００１９】また、本出願に係る第４の発明によれば、
上記目的は、芯金の上に弾性層と離型層を順次形成し、
該弾性層中に、該芯金の長手方向に略平行で、該芯金の
周方向の複数箇所に設けられた貫通孔を有する加圧ロー
ラであって、加熱手段により加熱された被加熱部材に圧
接されるように配設され、該被加熱部材との圧接部にて
記録材を挟持搬送しつつ、記録材上の未定着画像を記録
材へ定着させる画像形成装置の定着装置に使用される加
圧ローラにおに使用される加圧ローラにおいて、上記弾
性層部の断面積をＳ0、上記貫通孔部の総断面積をＳと
したとき、ＳとＳ0との比の値Ｓ／Ｓ0を、０．０２以下
に設定することにより達成される。According to the fourth invention of the present application,
The above-mentioned purpose is to sequentially form an elastic layer and a release layer on the core metal,
A pressure roller having through-holes in the elastic layer, which are substantially parallel to the longitudinal direction of the cored bar and are provided at a plurality of circumferential positions of the cored bar, the member being heated by a heating means. It is used for a fixing device of an image forming apparatus for fixing an unfixed image on a recording material to a recording material while sandwiching and transporting the recording material at a pressure contact portion with the heated member. In a pressure roller used as a pressure roller according to the present invention, when the cross-sectional area of the elastic layer portion is S 0 and the total cross-sectional area of the through hole portion is S, the value S of the ratio of S to S 0 is S. This is achieved by setting / S 0 to 0.02 or less.
【００２０】さらに、本出願に係る第５の発明によれ
ば、上記目的は、加圧ローラのローラ硬度を４６°以下
に設定することにより達成される。Further, according to the fifth invention of the present application, the above object is achieved by setting the roller hardness of the pressure roller to 46 ° or less.
【００２１】また、本出願に係る第６の発明によれば、
上記目的は、中空円筒形の内壁を有する成形型中に、貫
通孔に相当する径あるいは形状及び長さを有する部材を
予め設け、該成形型内で加硫発泡させることにより貫通
孔を形成したことにより達成される。According to the sixth invention of the present application,
The above-mentioned object is to previously provide a member having a diameter or a shape and a length corresponding to a through hole in a molding die having a hollow cylindrical inner wall, and form the through hole by vulcanizing and foaming in the molding die. It is achieved by
【００２２】[0022]
【作用】本出願に係る第１の発明によれば、加圧ローラ
表面と貫通孔との距離を３ｍｍ以上に設定することによ
り、貫通孔のある加圧ローラ周方向位置と貫通孔のない
周方向位置における圧力の差がなくなり、定着後画像上
の光沢ムラ、定着性ムラ等が発生しないことが分かっ
た。According to the first invention of the present application, by setting the distance between the surface of the pressure roller and the through hole to 3 mm or more, the circumferential position of the pressure roller with the through hole and the circumferential position without the through hole are set. It was found that there was no difference in pressure between the directional positions, and there was no unevenness in gloss or fixing property on the image after fixing.
【００２３】また、本出願に係る第２の発明によれば、
最も近接する貫通孔間の弾性層の厚さを２ｍｍ以上に設
定することで、十分な強度が得られ、長時間使用した場
合でも弾性層の破断等を発生させない。According to the second invention of the present application,
By setting the thickness of the elastic layer between the closest through holes to 2 mm or more, sufficient strength can be obtained and the elastic layer does not break even when used for a long time.
【００２４】さらに、本出願に係る第３の発明によれ
ば、被加熱部材と加圧ローラの圧接部の幅をｄ、加圧ロ
ーラの外径をＤ2、圧接部での被加熱部材の曲率半径を
Ｄ1としたとき、Further, according to the third invention of the present application, the width of the pressure contact portion between the member to be heated and the pressure roller is d, the outer diameter of the pressure roller is D 2 , and the member to be heated at the pressure contact portion is When the radius of curvature is D 1 ,
【００２５】[0025]
【数１】ｉ＝ｄ2／４Ｄ（１／Ｄ＝１／Ｄ1＋１／Ｄ2）## EQU1 ## i = d 2 / 4D (1 / D = 1 / D 1 + 1 / D 2 )
【００２６】で表される加圧ローラの変形量ｉと、弾性
層の厚さｔとの比の値ｉ／ｔを、０．０３以下に設定す
ることにより、加圧ローラの変形量が少なく、弾性層及
び離型層に係るストレスが小さくなって、長時間使用し
た場合のローラ硬度の低下、ゴム破断、ＰＦＡチューブ
の剥れ、チューブ皺等の不具合を発生させない。By setting the value i / t of the ratio of the deformation amount i of the pressure roller expressed by and the thickness t of the elastic layer to 0.03 or less, the deformation amount of the pressure roller can be reduced. Also, the stresses on the elastic layer and the release layer are reduced, and problems such as lower roller hardness, rubber breakage, PFA tube peeling, and tube wrinkles do not occur when used for a long time.
【００２７】また、本出願に係る第４の発明によれば、
弾性層の断面積をＳ、貫通孔の総断面積をＳ0とする
と、Ｓ／Ｓ0＜０．０２であるようにすることにより、
弾性層に係るストレスが小さくなり、長時間使用した場
合でも、ローラ硬度の低下、ゴム破断等を発生させな
い。According to the fourth invention of the present application,
S / S 0 <0.02, where S is the cross-sectional area of the elastic layer and S 0 is the total cross-sectional area of the through holes.
The stress applied to the elastic layer is reduced, and even when it is used for a long time, the hardness of the roller is not lowered, and the rubber is not broken.
【００２８】さらに、本出願に係る第５の発明によれ
ば、加圧ローラのローラ硬度を４６°（高分子計器株式
会社製ＡＳＫＥＲ−Ｃ型ゴム硬度計による測定値）以下
に設定することにより、十分な強度を確保しつつ、適切
な圧接部幅が得られるため、良好な定着が行われる。Further, according to the fifth invention of the present application, by setting the roller hardness of the pressure roller to 46 ° (measured value by ASKER-C type rubber hardness meter manufactured by Kobunshi Keiki Co., Ltd.) or less. Since an appropriate pressure contact portion width can be obtained while ensuring sufficient strength, good fixing is performed.
【００２９】また、本出願に係る第６の発明によれば、
型内に貫通孔に相当する部材を予め設け、この中にゴム
材（発泡剤含む）を注入し、加硫発泡することで貫通孔
を設けることにより、弾性層の発泡率が大きくても、容
易に小さな貫通孔を形成する。According to the sixth invention of the present application,
By providing a member corresponding to the through hole in the mold in advance, injecting a rubber material (including a foaming agent) into the mold, and vulcanizing and foaming to form the through hole, even if the elastic layer has a large foaming rate, Easily form small through holes.
【００３０】[0030]
【実施例】以下、本発明の実施例を添付図面に基づいて
説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００３１】（第１の実施例）先ず、本発明の第１の実
施例を図１に基づいて説明する。図１は、本実施例の加
圧ローラの構成を示す図である。(First Embodiment) First, a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram showing the configuration of the pressure roller of this embodiment.
【００３２】図１において、１は芯金であり、材質は鉄
を使用している。２は弾性層でありシリコーンゴムにカ
ーボンブラック等の導電性付与剤を混入し、加硫発泡さ
せた導電性スポンジゴムを使用している。３は離型層で
あり、テトラフルオルエチレンとパーフルオルアルキル
パーフルオルビニルエーテルの共重合体（以下、ＰＦＡ
とする）の５０μｍ厚のＰＦＡチューブを使用してい
る。４は貫通孔であり、加圧ローラの軸に平行に形成さ
れている。In FIG. 1, reference numeral 1 is a core bar, and the material is iron. An elastic layer 2 is made of conductive sponge rubber which is vulcanized and foamed by mixing a conductivity imparting agent such as carbon black into silicone rubber. 3 is a release layer, which is a copolymer of tetrafluoroethylene and perfluoroalkylperfluorovinyl ether (hereinafter referred to as PFA).
The PFA tube having a thickness of 50 μm) is used. Reference numeral 4 denotes a through hole, which is formed parallel to the axis of the pressure roller.
【００３３】このような加圧ローラ５は、図２に示すよ
うな加熱ローラ１４に圧接するように配設され、トナー
像Ｔが転写された記録材１１をヒータ１３で加熱しなが
ら挟持搬送することで定着を行うようになっている。The pressure roller 5 is arranged so as to be in pressure contact with the heating roller 14 as shown in FIG. 2, and the recording material 11 on which the toner image T is transferred is nipped and conveyed while being heated by the heater 13. It is supposed to be fixed by this.
【００３４】上記記録材１１へのトナー像Ｔの転写は、
回転自在に配設された感光ドラム６の表面を帯電ローラ
７によって一様に帯電した後、レーザー光８によって露
光を行い、これによって形成された静電潜像を現像装置
９のトナーにより現像し、この現像した像に対して転写
ローラ１０から逆極性の電圧を印加することにより行っ
ている。なお、転写されずに感光ドラム６上に残留した
トナーは、クリーナ１２によって除去されるようになっ
ている。The transfer of the toner image T onto the recording material 11 is as follows.
The surface of the rotatably arranged photosensitive drum 6 is uniformly charged by a charging roller 7 and then exposed by a laser beam 8 to develop the electrostatic latent image formed by the toner of a developing device 9. The transfer roller 10 applies a voltage of opposite polarity to the developed image. The toner remaining on the photosensitive drum 6 without being transferred is removed by the cleaner 12.
【００３５】しかしながら、このような画像形成装置に
おいては、加圧ローラ５の貫通孔４と該加圧ローラ５の
表面との距離が短い場合には、出力された画像に光沢ム
ラを生じることがあった。However, in such an image forming apparatus, when the distance between the through hole 4 of the pressure roller 5 and the surface of the pressure roller 5 is short, the output image may have uneven gloss. there were.
【００３６】そこで、加熱ローラ１４の直径を２５ｍ
ｍ、加圧ローラ５の直径を２５ｍｍ、ローラ硬度を４０
〜４６°（高分子計器株式会社製ＡＳＫＥＲ−Ｃ型ゴム
硬度計による測定値。以下、同様。）とし、さらに加圧
力を１２ｋｇ程度、ニップを４〜６ｍｍ程度として、貫
通孔と加圧ローラの表面との距離を変えながら、図２に
示す画像形成装置に装着して長時間画像形成動作を行っ
た。その際の画像光沢のレベルを調べた結果をまとめた
ものが表１である。Therefore, the diameter of the heating roller 14 is set to 25 m.
m, the diameter of the pressure roller 5 is 25 mm, and the roller hardness is 40
˜46 ° (measured value by ASKER-C type rubber hardness meter manufactured by Kobunshi Keiki Co., Ltd., the same applies below), and the pressure is about 12 kg and the nip is about 4 to 6 mm. While changing the distance from the surface, the image forming apparatus shown in FIG. Table 1 summarizes the results of examining the image gloss level at that time.
【００３７】[0037]
【表１】 [Table 1]
【００３８】表１に示すように、貫通孔４の位置が加圧
ローラ５の表面に対して１〜２ｍｍの場合には、圧接さ
れた加圧ローラと加熱ローラとで形成されるニップ部に
おいて、貫通孔のある加圧ローラ周方向位置と貫通孔の
ない周方向位置とで圧力が異なり、貫通孔のある位置は
ない位置に比べて圧力が小さくなるため、貫通孔のある
位置とない位置とで定着強度に差ができてしまい、ベタ
黒画像等のベタ画像では、定着後の画像の光沢が少なく
なってしまった。As shown in Table 1, when the position of the through hole 4 is 1 to 2 mm with respect to the surface of the pressure roller 5, in the nip portion formed by the pressure roller and the heating roller which are in pressure contact with each other. Since the pressure is different between the position of the pressure roller with the through hole and the position of the pressure roller without the through hole, and the pressure is smaller than the position without the through hole, the position with and without the through hole As a result, the fixing strength becomes different, and in a solid image such as a solid black image, the gloss of the image after fixing is reduced.
【００３９】しかし、貫通孔と加熱ローラ表面との距離
を３ｍｍ以上離して形成した場合には、このような問題
がなく、ニップ部での貫通孔の影響による圧力ムラを防
ぎ定着後画像上の光沢ムラ、定着性ムラ等を防ぐことが
できる。However, when the through hole and the surface of the heating roller are formed with a distance of 3 mm or more, such a problem does not occur, and pressure unevenness due to the effect of the through hole in the nip portion is prevented, and the image on the fixed image is fixed. It is possible to prevent uneven glossiness and uneven fixability.
【００４０】（第２の実施例）次に、本発明の第２の実
施例を図３に基づいて説明する。なお、第１の実施例と
の共通箇所については同一符号を付して説明を省略す
る。(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. The same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.
【００４１】第１の実施例のように貫通孔を設けた加圧
ローラを用いた場合の他の問題としては、貫通孔と最近
接の貫通孔との間が短いために生じる、ゴム破断が挙げ
られる。Another problem in the case of using the pressure roller having the through hole as in the first embodiment is that the rubber breakage caused by the short distance between the through hole and the closest through hole is caused. Can be mentioned.
【００４２】そこで、加熱ローラ１４の直径を２５ｍ
ｍ、加圧ローラ５の直径を２５ｍｍとし、ローラ硬度を
４０〜４６°とし、加圧力を１２ｋｇ程度、ニップ４〜
６ｍｍ程度として、加圧ローラ５の貫通孔と最近接貫通
孔との間のスポンジゴム肉厚を変えながら、図２の画像
形成装置に装着して長時間画像形成動作を行った。その
際のスポンジゴム破断等の不具合レベルを調べた結果を
まとめたものを表２に示す。Therefore, the diameter of the heating roller 14 is set to 25 m.
m, the diameter of the pressure roller 5 is 25 mm, the roller hardness is 40 to 46 °, the pressure is about 12 kg, and the nip 4 to
The thickness was set to about 6 mm, and while the thickness of the sponge rubber between the through hole of the pressure roller 5 and the closest through hole was changed, the image forming apparatus of FIG. Table 2 shows a summary of the results of examining the level of defects such as sponge rubber breakage at that time.
【００４３】[0043]
【表２】 [Table 2]
【００４４】表２から分かるように、貫通孔間のゴム肉
厚が１ｍｍの加圧ローラでは、貫通孔間のゴム部の肉厚
が薄いため、強度が弱くなり、長時間使用した場合に、
ゴム破断等の不具合が見られた。特に、ローラ硬度４０
〜４６°程度の低硬度のローラでは、スポンジゴム層の
硬度も柔らかく、強度的にも弱い。また、加圧ローラ変
形量も大きいため、ローラにかかるストレスも大きいた
め、１ｍｍ程度のゴム肉厚では、不具合が発生してしま
ったと思われる。As can be seen from Table 2, in the pressure roller having a rubber wall thickness of 1 mm between the through holes, the rubber portion between the through holes has a small wall thickness, so that the strength becomes weak and, when it is used for a long time,
Problems such as rubber breakage were observed. Especially, roller hardness 40
In a roller having a low hardness of about 46 °, the sponge rubber layer has a soft hardness and a weak strength. Further, since the amount of deformation of the pressure roller is large and the stress applied to the roller is also large, it is considered that a problem occurs with a rubber wall thickness of about 1 mm.
【００４５】しかし、本実施例の加圧ローラ５のように
貫通孔間のゴム肉厚を２ｍｍ以上とすると、不具合は見
られなかった。However, when the rubber wall thickness between the through holes is set to 2 mm or more as in the pressure roller 5 of this embodiment, no defect was observed.
【００４６】（第３の実施例）次に、本発明の第３の実
施例を図４に基づいて説明する。なお、第１の実施例と
の共通箇所については同一符号を付して説明を省略す
る。(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG. The same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.
【００４７】また、上述のような貫通孔を設けた加圧ロ
ーラの他の問題点として、長時間使用した場合の、加圧
ローラ硬度の低下、ゴム破断、ＰＦＡチューブの皺の発
生、チューブ剥れ等が挙げられる。As another problem of the pressure roller having the through holes as described above, the hardness of the pressure roller is reduced, the rubber is broken, the PFA tube is wrinkled, and the tube is peeled off when it is used for a long time. These are examples.
【００４８】そこで、加熱ローラ１４の外径を２５ｍ
ｍ、加圧ローラ５の外径を２５ｍｍ、硬度を４０〜４６
°、ゴム肉厚をそれそれ５．５、７．５ｍｍとし、ニッ
プ幅４〜６ｍｍ程度の条件として、図２の画像形成装置
に装着して長時間画像形成動作を行った。その際の不具
合発生レベルをまとめたものが表３である。Therefore, the outer diameter of the heating roller 14 is set to 25 m.
m, the outer diameter of the pressure roller 5 is 25 mm, and the hardness is 40 to 46.
The rubber wall thickness was set to 5.5 and 7.5 mm, respectively, and the nip width was set to about 4 to 6 mm. Table 3 summarizes the problem occurrence levels at that time.
【００４９】[0049]
【表３】 [Table 3]
【００５０】なお、表３においてｉは図４に示すような
加圧ローラの変形量であり、ニップ部の幅をｄ、加熱ロ
ーラ１４、加圧ローラ５の外径をそれぞれＤ1、Ｄ2とす
ると、変形量ｉは次式で表される。In Table 3, i is the deformation amount of the pressure roller as shown in FIG. 4, where the width of the nip portion is d and the outer diameters of the heating roller 14 and the pressure roller 5 are D 1 and D 2 , respectively. Then, the deformation amount i is expressed by the following equation.
【００５１】[0051]
【数２】ｉ＝ｄ2／４Ｄ（１／Ｄ＝１／Ｄ1＋１／Ｄ2）## EQU2 ## i = d 2 / 4D (1 / D = 1 / D 1 + 1 / D 2 )
【００５２】上記表３から分かるように、ＮＯ．１で
は、ニップ幅が２ｍｍと小さいため、加圧ローラ変形量
も少なく、加圧ローラスポンジゴム層にかかるストレス
及び離型層にかかるストレスも小さくなり、長時間使用
した場合に、加圧ローラ硬度の低下、ゴム破断、ＰＦＡ
チューブの皺の発生、チューブ剥れ等の不具合が発生せ
ず、良好であった。As can be seen from Table 3 above, NO. In No. 1, since the nip width is as small as 2 mm, the amount of deformation of the pressure roller is small, the stress on the pressure roller sponge rubber layer and the stress on the release layer are also small, and the pressure roller hardness when used for a long time. Degradation, rubber breakage, PFA
The tube was good, with no problems such as wrinkles and tube peeling.
【００５３】しかし、ＮＯ．３のように、ニップ幅が７
ｍｍもあると、加圧ローラ変形量が大きいため、長時間
使用した場合の不具合が発生した。However, NO. As in 3, the nip width is 7
When it is also mm, the deformation amount of the pressure roller is large, so that a problem occurs when it is used for a long time.
【００５４】また、加圧ローラ変形量ｉに比べてスポン
ジゴム層肉厚ｔが薄い場合には、スポンジゴム層に加わ
るストレスが大きいため、上記の不具合が発生し易い。Further, when the thickness t of the sponge rubber layer is smaller than the deformation amount i of the pressure roller, the stress applied to the sponge rubber layer is large, so that the above-mentioned problems are likely to occur.
【００５５】このように、加圧ローラ変形量ｉとスポン
ジゴム層肉厚ｔの比が、約０．０３以下であれば、長時
間使用した場合の不具合発生を防げることが分かった。
従って、本実施例のように、加圧ローラ変形量ｉとスポ
ンジゴム層肉厚ｔの比が約０．０３以下の条件で加圧ロ
ーラを使用すれば、長時間使用した場合の不具合発生を
防ぐことができる。As described above, it has been found that when the ratio of the deformation amount i of the pressure roller to the thickness t of the sponge rubber layer is about 0.03 or less, it is possible to prevent the occurrence of defects when used for a long time.
Therefore, if the pressure roller is used under the condition that the ratio of the deformation amount i of the pressure roller and the thickness t of the sponge rubber layer is about 0.03 or less as in the present embodiment, the occurrence of troubles when used for a long time may occur. Can be prevented.
【００５６】（第４の実施例）次に、本発明の第４の実
施例を図５に基づいて説明する。なお、第１の実施例と
の共通箇所については同一符号を付して説明を省略す
る。(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to FIG. The same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.
【００５７】本実施例は、貫通孔の大きさと上述した硬
度低下、ゴム破断等との関係を調べたものである。In this example, the relationship between the size of the through hole and the above-mentioned decrease in hardness, rubber breakage, etc. was investigated.
【００５８】実験は、加熱ローラ１４及び加圧ローラ５
の外径を共に直径２５ｍｍ、スポンジゴム肉厚ｔをそれ
ぞれ５．５ｍｍ、７．５ｍｍ、ローラ硬度を４０〜４６
°とし、貫通孔の大きさを変えて、図２に示す画像形成
装置に装着し、長時間画像形成動作を行った。その際の
不具合（ローラ硬度ダウン、スポンジゴムの破断等）の
発生レベルを調べたものが表４である。In the experiment, the heating roller 14 and the pressure roller 5
Both have an outer diameter of 25 mm, sponge rubber wall thicknesses t of 5.5 mm and 7.5 mm, and a roller hardness of 40 to 46.
And the size of the through hole was changed, and the through hole was mounted on the image forming apparatus shown in FIG. 2 and the image forming operation was performed for a long time. Table 4 shows the occurrence levels of defects (roller hardness down, sponge rubber breakage, etc.) at that time.
【００５９】[0059]
【表４】 [Table 4]
【００６０】なお、加圧ローラの外径をＤ1、芯金外径
をＤ2とし、ゴム肉厚をｔとすると、離型層は、５０μ
ｍ厚のＰＦＡチューブを使用しているので、When the outer diameter of the pressure roller is D 1 , the outer diameter of the core metal is D 2 , and the rubber thickness is t, the release layer is 50 μm.
Since an m-thick PFA tube is used,
【００６１】[0061]
【数３】ｔ≒（Ｄ1−Ｄ2）[Equation 3] t≈ (D 1 −D 2 )
【００６２】である。従って、スポンジゴム層の断面積
Ｓ0は、It is Therefore, the cross-sectional area S 0 of the sponge rubber layer is
【００６３】[0063]
【数４】Ｓ0≒π（（Ｄ 1）2−（Ｄ 2）2）## EQU4 ## S 0 ≈π ((D 1 ) 2- (D 2 ) 2 )
【００６４】で表される。また、スポンジゴム層の断面
積内に占める貫通孔の断面積をＳとすると、It is represented by When the cross-sectional area of the through hole occupying within the cross-sectional area of the sponge rubber layer is S,
【００６５】[0065]
【数５】 [Equation 5]
【００６６】で表される。It is represented by
【００６７】上記表４から分かるように、ＮＯ．３、４
では、貫通孔の断面積の占める割合が、約４％と大きい
ため、スポンジゴム層のゴム部にかかるストレスが大き
く、不具合が発生し易い。As can be seen from Table 4 above, NO. Three and four
Then, since the ratio of the cross-sectional area of the through hole is as large as about 4%, the stress applied to the rubber portion of the sponge rubber layer is large and a problem is likely to occur.
【００６８】しかし、ＮＯ．１のように、貫通孔の断面
積の占める割合が約１．３％程度のものについては、不
具合の発生が見られなかった。また、ＮＯ．２では、割
合が２％であるが、不具合発生は若干見られたが、許容
レベルであった。However, NO. No defect was observed in the case where the ratio of the cross-sectional area of the through hole was about 1.3% as in No. 1. In addition, NO. In No. 2, although the ratio was 2%, some defects were observed, but it was at an acceptable level.
【００６９】従って、本実施例のように、貫通孔の断面
積の占める割合が約２％以下であるような加圧ローラを
使用することにより、不具合の発生を防ぐことができ
る。Therefore, as in this embodiment, by using the pressure roller in which the cross-sectional area of the through hole occupies about 2% or less, it is possible to prevent the occurrence of trouble.
【００７０】（第５の実施例）次に、本発明の第５の実
施例を図６に基づいて説明する。なお、第１の実施例と
の共通箇所については同一符号を付して説明を省略す
る。(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described with reference to FIG. The same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.
【００７１】図６は本実施例における加圧ローラの製造
方法を説明するための図である。従来の加圧ローラは、
貫通孔に相当する空孔を設けたゴム材を押し出し後、加
硫発泡させていたため、発泡時に貫通孔も大きくなって
しまって小さな貫通孔を作ることが難しかった。FIG. 6 is a view for explaining the method of manufacturing the pressure roller in this embodiment. The conventional pressure roller is
Since the rubber material having the holes corresponding to the through holes was extruded and then vulcanized and foamed, the through holes became large at the time of foaming, and it was difficult to make a small through hole.
【００７２】そこで、本発明では、スポンジゴム層に貫
通孔を有する加圧ローラを製造するのに、型法を用い、
予め型内に貫通孔に相当するピンを設けておき、型内に
ゴム材（発泡剤を含む）に注入し、型内にて加硫発泡さ
せることにより、貫通孔を有する加圧ローラのスポンジ
ゴム層を形成することとした。Therefore, in the present invention, the mold method is used to manufacture the pressure roller having the through holes in the sponge rubber layer,
A pin corresponding to a through hole is provided in the mold in advance, and a rubber material (including a foaming agent) is injected into the mold and vulcanized and foamed in the mold to form a sponge for a pressure roller having a through hole. It was decided to form a rubber layer.
【００７３】本発明のように型内で加硫発泡させること
により、貫通孔の形状、大きさは、予め型内に設けられ
ているピンの形状、大きさにより決まり、予め型内に設
けておくピンの大きさを、細かいものにしておけば、小
さな貫通孔をもつ加圧ローラを容易に形成することがで
きる。By vulcanizing and foaming in the mold as in the present invention, the shape and size of the through-hole are determined by the shape and size of the pin previously provided in the mold. If the size of the pin to be placed is small, the pressure roller having a small through hole can be easily formed.
【００７４】（第６の実施例）次に、本発明の第６の実
施例を図４に基づいて説明する。なお、第１の実施例と
の共通箇所については同一符号を付して説明を省略す
る。(Sixth Embodiment) Next, a sixth embodiment of the present invention will be described with reference to FIG. The same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.
【００７５】本実施例においては、加圧ローラ変形量ｉ
（＝ｄ2／４Ｄ）と貫通孔とローラ表面との距離Ｌの関
係を調べたものである。In this embodiment, the pressure roller deformation amount i
The relationship between (= d 2 / 4D) and the distance L between the through hole and the roller surface is examined.
【００７６】その結果、ニップ幅を４ｍｍ、上記距離Ｌ
を１ｍｍとしたローラ（直径２５ｍｍ）を使用した場
合、ｉ／Ｌ＝０．１６であり、加圧ローラ変形量に比べ
て貫通孔がローラ表面近傍にあるため、定着後画像の不
具合が発生した。As a result, the nip width is 4 mm and the distance L is
When a roller having a diameter of 1 mm (diameter of 25 mm) was used, i / L = 0.16, and the through hole was located near the roller surface as compared with the deformation amount of the pressure roller. .
【００７７】しかし、ニップ幅を４ｍｍ、上記距離Ｌを
３ｍｍとしたローラ（直径２５ｍｍ）では、ｉ／Ｌ＝
０．０５３であり、不具合は見られなかった。However, with a roller (diameter 25 mm) in which the nip width is 4 mm and the distance L is 3 mm, i / L =
It was 0.053, and no defect was observed.
【００７８】また、ニップ幅を２ｍｍ、上記距離Ｌを１
ｍｍとしたローラ（直径２５ｍｍ）では、ｉ／Ｌ＝０．
０４であり、ローラ変形量自体が小さいため、Ｌが小さ
くても定着後画像の不具合は見られなかった。The nip width is 2 mm and the distance L is 1
With a roller (diameter 25 mm) of mm, i / L = 0.
Since the amount of roller deformation itself is small, no defect was observed in the image after fixing even if L was small.
【００７９】なお、以上説明した各実施例においては、
離型層としてＰＦＡチューブを用いたが、この他に、フ
ッ素ゴム、ＰＴＦＥ（ポリテトラフルオロエチレン）、
ＦＥＰ（テトラフルオロエチレン−ヘキサフルオロプロ
ピレン共重合体）、ＥＴＦＥ（エチレン−テトラフルオ
ロエチレン共重合体）のフッ素樹脂を使用しても良い。In each of the embodiments described above,
A PFA tube was used as the release layer, but in addition to this, fluororubber, PTFE (polytetrafluoroethylene),
Fluorine resins such as FEP (tetrafluoroethylene-hexafluoropropylene copolymer) and ETFE (ethylene-tetrafluoroethylene copolymer) may be used.
【００８０】また、弾性層として、シリコーンゴムの他
に、ＥＰＤＭゴム、フッ素ゴム等を発泡させたスポンジ
ゴムでも良い。Further, as the elastic layer, in addition to silicone rubber, EPDM rubber, sponge rubber obtained by foaming fluororubber or the like may be used.
【００８１】さらに、貫通孔は必ずしも貫通していなく
ても良く、加圧ローラ両端部の一方が塞がっていても良
い。Furthermore, the through hole does not necessarily have to penetrate, and one of both ends of the pressure roller may be closed.
【００８２】また、加圧ローラは加熱手段により加熱さ
れていても良い。The pressure roller may be heated by a heating means.
【００８３】[0083]
【発明の効果】以上説明したように、本出願に係る第１
の発明によれば、加圧ローラ表面と貫通孔との距離を３
ｍｍ以上に設定することにより、定着後画像上の光沢ム
ラ、定着性ムラ等を防止することができる。As described above, the first aspect of the present application
According to the invention, the distance between the pressure roller surface and the through hole is 3
By setting the thickness to mm or more, it is possible to prevent gloss unevenness, fixability unevenness, and the like on the image after fixing.
【００８４】また、本出願に係る第２の発明によれば、
最も近接する貫通孔間の弾性層の厚さを２ｍｍ以上に設
定することにより、長時間使用した場合の弾性層の破断
等を防止することができる。According to the second invention of the present application,
By setting the thickness of the elastic layer between the closest through holes to 2 mm or more, it is possible to prevent the elastic layer from breaking or the like when used for a long time.
【００８５】さらに、本出願に係る第３の発明によれ
ば、加圧ローラの変形量ｉと、弾性層の厚さｔとの比の
値ｉ／ｔを、０．０３以下に設定することにより、長時
間使した場合のローラ硬度の低下、ゴム破断、ＰＦＡチ
ューブの剥れ、チューブ皺等の不具合を発生を防止する
ことができる。Further, according to the third invention of the present application, the ratio value i / t between the deformation amount i of the pressure roller and the thickness t of the elastic layer is set to 0.03 or less. As a result, it is possible to prevent problems such as a decrease in roller hardness, rubber breakage, PFA tube peeling, and tube wrinkling when used for a long time.
【００８６】また、本出願に係る第４の発明によれば、
弾性層の断面積をＳ、貫通孔の総断面積をＳ0とする
と、Ｓ／Ｓ0＜０．０２であるようにすることにより、
長時間使用した場合でも、ローラ硬度の低下、ゴム破断
等の発生を防止することができる。According to the fourth invention of the present application,
S / S 0 <0.02, where S is the cross-sectional area of the elastic layer and S 0 is the total cross-sectional area of the through holes.
Even when it is used for a long period of time, it is possible to prevent the decrease in roller hardness and the occurrence of rubber breakage.
【００８７】さらに、本出願に係る第５の発明によれ
ば、加圧ローラのローラ硬度を４６°以下に設定するこ
とにより、十分な強度を確保することができ、かつ、適
切な圧接部幅が得られるため、良好な定着を行うことが
できる。Further, according to the fifth invention of the present application, by setting the roller hardness of the pressure roller to be 46 ° or less, sufficient strength can be secured and an appropriate pressure contact portion width can be obtained. Therefore, good fixing can be performed.
【００８８】また、本出願に係る第６の発明によれば、
型内に貫通孔に相当する部材を予め設け、この中にゴム
材（発泡剤含む）を注入し、加硫発泡することで貫通孔
を設けることにより、弾性層の発泡率が大きくても、容
易に小さな貫通孔を形成することができるので、小型
で、ローラ硬度が低く、貫通孔による不具合が少ない加
圧ローラを提供できる。According to the sixth invention of the present application,
By providing a member corresponding to the through hole in the mold in advance, injecting a rubber material (including a foaming agent) into the mold, and vulcanizing and foaming to form the through hole, even if the elastic layer has a large foaming rate, Since the small through hole can be easily formed, it is possible to provide a compact pressure roller having a low roller hardness and less defects due to the through hole.
【図１】本発明の第１の実施例における加圧ローラの断
面図である。FIG. 1 is a sectional view of a pressure roller according to a first embodiment of the present invention.
【図２】本発明の加圧ローラが使用される電子写真装置
の一例の概略構成図である。FIG. 2 is a schematic configuration diagram of an example of an electrophotographic apparatus in which the pressure roller of the present invention is used.
【図３】本発明の第２の実施例における加圧ローラの断
面図である。FIG. 3 is a sectional view of a pressure roller according to a second embodiment of the present invention.
【図４】本発明の第３の実施例における加圧ローラの断
面図である。FIG. 4 is a sectional view of a pressure roller according to a third embodiment of the present invention.
【図５】本発明の第４の実施例における加圧ローラの断
面図である。FIG. 5 is a sectional view of a pressure roller according to a fourth embodiment of the present invention.
【図６】本発明の第５の実施例における加圧ローラの製
造方法の説明図である。FIG. 6 is an explanatory diagram of a method of manufacturing a pressure roller according to the fifth embodiment of the present invention.
【図７】従来の加圧ローラの断面図である。FIG. 7 is a cross-sectional view of a conventional pressure roller.
１ 芯金 ２ 弾性層 ３ 離型層 ４ 貫通孔 ５ 加圧ローラ １１ 記録材 １３ ヒータ（加熱手段） １４ 加熱ローラ（被加熱部材） ２０ 型（成形型） ２２ 貫通孔を設けるための部材 Ｔ トナー像（未定着画像） 1 core metal 2 elastic layer 3 release layer 4 through hole 5 pressure roller 11 recording material 13 heater (heating means) 14 heating roller (heated member) 20 type (molding die) 22 member for providing through hole T toner Image (unfixed image)
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 // Ｂ２９Ｋ 105:04 105:24 Ｂ２９Ｌ 31:00 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 6 Identification code Office reference number FI technical display area // B29K 105: 04 105: 24 B29L 31:00
Claims (6)
し、該弾性層中に、該芯金の長手方向に略平行で、該芯
金の周方向の複数箇所に設けられた貫通孔を有する加圧
ローラであって、加熱手段により加熱された被加熱部材
に圧接されるように配設され、該被加熱部材との圧接部
にて記録材を挟持搬送しつつ、記録材上の未定着画像を
記録材へ定着させる画像形成装置の定着装置に使用され
る加圧ローラにおいて、上記加圧ローラ表面と上記貫通
孔との距離は、３ｍｍ以上に設定されていることを特徴
とする加圧ローラ。1. An elastic layer and a release layer are sequentially formed on a cored bar, and are provided in the elastic layer at a plurality of positions in the circumferential direction of the cored bar substantially parallel to the longitudinal direction of the cored bar. A pressure roller having a through hole, which is arranged so as to be brought into pressure contact with a heated member heated by a heating means, and the recording material is nipped and conveyed at a pressure contact portion with the heated member, and recording is performed. In a pressure roller used in a fixing device of an image forming apparatus for fixing an unfixed image on a recording material to a recording material, the distance between the surface of the pressure roller and the through hole is set to 3 mm or more. Characteristic pressure roller.
し、該弾性層中に、該芯金の長手方向に略平行で、該芯
金の周方向の複数箇所に設けられた貫通孔を有する加圧
ローラであって、加熱手段により加熱された被加熱部材
に圧接されるように配設され、該被加熱部材との圧接部
にて記録材を挟持搬送しつつ、記録材上の未定着画像を
記録材へ定着させる画像形成装置の定着装置に使用され
る加圧ローラにおいて、最も近接する上記貫通孔間の上
記弾性層の厚さは、２ｍｍ以上に設定されていることを
特徴とする加圧ローラ。2. An elastic layer and a release layer are sequentially formed on a core metal, and are provided in the elastic layer at a plurality of positions in the circumferential direction of the core metal substantially parallel to the longitudinal direction of the core metal. A pressure roller having a through hole, which is arranged so as to be brought into pressure contact with a heated member heated by a heating means, and a recording material is sandwiched and conveyed at a pressure contact portion with the heated member while recording. In the pressure roller used in the fixing device of the image forming apparatus for fixing the unfixed image on the recording material to the recording material, the thickness of the elastic layer between the closest through holes is set to 2 mm or more. A pressure roller characterized in that
し、該弾性層中に、該芯金の長手方向に略平行で、該芯
金の周方向の複数箇所に設けられた貫通孔を有する加圧
ローラであって、加熱手段により加熱された被加熱部材
に圧接されるように配設され、該被加熱部材との圧接部
にて記録材を挟持搬送しつつ、記録材上の未定着画像を
記録材へ定着させる画像形成装置の定着装置に使用され
る加圧ローラにおいて、上記加圧ローラの変形量ｉと、
上記弾性層の厚さｔとの比の値ｉ／ｔは、０．０３以下
に設定されていることを特徴とする加圧ローラ。3. An elastic layer and a release layer are sequentially formed on a core metal, and are provided in the elastic layer at a plurality of positions in the circumferential direction of the core metal substantially parallel to the longitudinal direction of the core metal. A pressure roller having a through hole, which is arranged so as to be brought into pressure contact with a heated member heated by a heating means, and the recording material is nipped and conveyed at a pressure contact portion with the heated member, and recording is performed. In a pressure roller used in a fixing device of an image forming apparatus for fixing an unfixed image on a recording material to a recording material, a deformation amount i of the pressure roller,
The value i / t of the ratio to the thickness t of the elastic layer is set to 0.03 or less.
し、該弾性層中に、該芯金の長手方向に略平行で、該芯
金の周方向の複数箇所に設けられた貫通孔を有する加圧
ローラであって、加熱手段により加熱された被加熱部材
に圧接されるように配設され、該被加熱部材との圧接部
にて記録材を挟持搬送しつつ、記録材上の未定着画像を
記録材へ定着させる画像形成装置の定着装置に使用され
る加圧ローラにおに使用される加圧ローラにおいて、上
記弾性層部の断面積をＳ0、上記貫通孔部の総断面積を
Ｓとすると、ＳとＳ0との比の値Ｓ／Ｓ0は、０．０２以
下に設定されていることを特徴とする加圧ローラ。4. An elastic layer and a release layer are sequentially formed on a core metal, and are provided in the elastic layer at a plurality of positions in the circumferential direction of the core metal substantially parallel to the longitudinal direction of the core metal. A pressure roller having a through hole, which is arranged so as to be brought into pressure contact with a heated member heated by a heating means, and a recording material is sandwiched and conveyed at a pressure contact portion with the heated member while recording. In a pressure roller used in a pressure roller used in a fixing device of an image forming apparatus for fixing an unfixed image on a recording material to a recording material, a cross-sectional area of the elastic layer portion is S 0 , the through hole is When the total cross-sectional area of the part and S, the value S / S 0 of the ratio of the S and S 0 is the pressure roller, characterized in that it is set to 0.02 or less.
設定されていることとする請求項１ないし請求項４のい
ずれかに記載の加圧ローラ。5. The pressure roller according to claim 1, wherein a roller hardness of the pressure roller is set to 46 ° or less.
貫通孔に相当する径あるいは形状及び長さを有する部材
を予め設け、該成形型内で加硫発泡させることにより貫
通孔を形成し、請求項１ないし請求項５のいずれかに記
載された加圧ローラを製造することを特徴とする製造方
法。6. A mold having a hollow cylindrical inner wall,
A member having a diameter or a shape and a length corresponding to the through hole is provided in advance, and the through hole is formed by vulcanizing and foaming in the molding die, and the adding member according to any one of claims 1 to 5 is formed. A manufacturing method comprising manufacturing a pressure roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6111780A JPH07295418A (en) | 1994-04-28 | 1994-04-28 | Pressure roller and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6111780A JPH07295418A (en) | 1994-04-28 | 1994-04-28 | Pressure roller and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07295418A true JPH07295418A (en) | 1995-11-10 |
Family
ID=14569982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6111780A Pending JPH07295418A (en) | 1994-04-28 | 1994-04-28 | Pressure roller and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07295418A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008139691A (en) * | 2006-12-04 | 2008-06-19 | Fuji Xerox Co Ltd | Roller, fixing device and image forming apparatus |
| JP2008180979A (en) * | 2007-01-25 | 2008-08-07 | Synztec Co Ltd | Fixing roller and method of manufacturing the same |
| US7558521B2 (en) | 2006-08-07 | 2009-07-07 | Fuji Xerox Co., Ltd. | Roller, fixing device, and image forming device |
-
1994
- 1994-04-28 JP JP6111780A patent/JPH07295418A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7558521B2 (en) | 2006-08-07 | 2009-07-07 | Fuji Xerox Co., Ltd. | Roller, fixing device, and image forming device |
| JP2008139691A (en) * | 2006-12-04 | 2008-06-19 | Fuji Xerox Co Ltd | Roller, fixing device and image forming apparatus |
| JP2008180979A (en) * | 2007-01-25 | 2008-08-07 | Synztec Co Ltd | Fixing roller and method of manufacturing the same |
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