JP4373244B2 - Pressure roller for fixing - Google Patents

Pressure roller for fixing Download PDF

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JP4373244B2
JP4373244B2 JP2004053467A JP2004053467A JP4373244B2 JP 4373244 B2 JP4373244 B2 JP 4373244B2 JP 2004053467 A JP2004053467 A JP 2004053467A JP 2004053467 A JP2004053467 A JP 2004053467A JP 4373244 B2 JP4373244 B2 JP 4373244B2
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pressure roller
sponge layer
fixing
heat
storage wall
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JP2005242100A (en
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真 佐原
康嘉 大庭
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Nissei Electric Co Ltd
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Nissei Electric Co Ltd
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Description

本発明は、プリンターや複写機等の画像定着用の熱定着部に用いられる定着用加圧ローラに関する。 The present invention relates to a fixing pressure roller used in a heat fixing unit for image fixing such as a printer or a copying machine.

従来、強制駆動される定着用加圧ローラ(以下、”加圧ローラ”と称する。)の表面弾性体には、スポンジ層からなるゴム発泡体が好んで使用されている。これは、該発泡体が硬度も低く同時に十分なニップ幅を確保できるからである。
しかし、該表面弾性体がスポンジ層である加圧ローラにおいては、定着時の熱でスポンジ層が熱膨張し、長手方向に沿って外径差が生じるという欠点がある。その結果、熱定着に必要なニップ幅が十分に得られない、という問題が生じている。
そこで、上記加熱時の外径変化対策として、スポンジ層中に、芯金の長手方向に平行で、且つその周方向に複数個の貫通孔、あるいは螺旋状の貫通孔を設けるという提案がなされている(例えば、特許文献1参照。)。この提案によれば、加熱時のスポンジ層外径は長手方向に沿ってほぼフラットになり、問題は一見解決したかに見える。しかしながら、このフラット形状の熱膨張方式(以下、”フラット方式”と称する。)では、加圧ローラを定着装置に組み込んで加熱した際、現実にはニップ幅が十分に確保されず、定着性が悪くなるという問題が生じている。
この理由は、以下のとおりである。
加圧ローラは、定着装置に組み込んだ際、その芯金の両端が軸受けなどで保持されつつ相手方のヒートローラに圧接されるので、加圧ローラの中央部が不可避的に撓んでくる。したがって、該ヒートローラとの間に逆(負)クラウン状のギャップが生じ、定着性が悪化するのである。
更に、このフラット方式では、スポンジ層の耐久性の問題が惹起される。と言うのも、該方式では、貫通孔が設けられている箇所のスポンジ層の厚さ(半径方向)が薄くなる為、ヒートローラとの圧接による負荷が、この薄肉スポンジ層の長手方向全体に一直線的に集中し、これによりスポンジ層の劣化が促進されるからである。
Conventionally, a rubber foam made of a sponge layer is preferably used as the surface elastic body of a fixing pressure roller (hereinafter referred to as “pressure roller”) that is forcibly driven. This is because the foam has a low hardness and can secure a sufficient nip width at the same time.
However, in the pressure roller whose surface elastic body is a sponge layer, there is a drawback that the sponge layer is thermally expanded by heat at the time of fixing, and an outer diameter difference occurs along the longitudinal direction. As a result, there arises a problem that a sufficient nip width necessary for heat fixing cannot be obtained.
Therefore, as a countermeasure against the outer diameter change at the time of heating, a proposal has been made to provide a plurality of through holes or spiral through holes in the sponge layer in parallel to the longitudinal direction of the metal core and in the circumferential direction. (For example, refer to Patent Document 1). According to this proposal, the outer diameter of the sponge layer during heating becomes almost flat along the longitudinal direction, and it seems that the problem has been solved at first glance. However, with this flat-shaped thermal expansion method (hereinafter referred to as “flat method”), when the pressure roller is incorporated in a fixing device and heated, the nip width is not sufficiently ensured in reality, and the fixability is low. There is a problem of getting worse.
The reason for this is as follows.
When the pressure roller is incorporated in the fixing device, both ends of the core metal are pressed against the heat roller of the other party while being held by a bearing or the like, so that the central portion of the pressure roller inevitably bends. Therefore, a reverse (negative) crown-like gap is formed between the heat roller and the fixing property is deteriorated.
Furthermore, in this flat method, a problem of durability of the sponge layer is caused. This is because in this method, the thickness (radial direction) of the sponge layer where the through-hole is provided is reduced, so that the load due to the pressure contact with the heat roller is applied to the entire longitudinal direction of the thin-walled sponge layer. This is because it concentrates in a straight line and this promotes the deterioration of the sponge layer.

特許2870878号公報Japanese Patent No. 2870878

したがって、本発明の課題は、加圧ローラを定着装置等に組み込んで加熱した際に、十分なニップ幅の確保により定着性が改善され、更には、スポンジ層の耐久性までもが向上した定着用加圧ローラを提供することにある。   Accordingly, an object of the present invention is to improve the fixing property by securing a sufficient nip width when the pressure roller is incorporated in a fixing device or the like, and further improve the durability of the sponge layer. It is to provide a pressure roller for use.

本発明者は、加圧ローラを定着装置等に組み込んで実際に加熱した際に、該ローラのスポンジ層が正クラウン状に熱膨張するような構造を採ることにより、フラット方式で生じる逆クラウン状ギャップを完全に回避するに至った。併せて、本発明者は、該スポンジ層中での放熱用中空路の配置状態について工夫することにより、前述の一直線的応力集中を回避することに成功した。   The present inventor adopts a structure in which when the pressure roller is incorporated in a fixing device or the like and actually heated, the sponge layer of the roller thermally expands in a regular crown shape, thereby generating an inverted crown shape that is generated in a flat manner. The gap was completely avoided. In addition, the present inventor succeeded in avoiding the above-mentioned linear stress concentration by devising the arrangement state of the heat radiation hollow path in the sponge layer.

本発明において特徴的なことは、芯金の長手方向の中央部と直交するスポンジ層部を放熱用中空路が貫通していない蓄熱壁として機能させること、また該蓄熱壁を境としてスポンジ層の各端部に向かって延在する放熱用中空路が左右非対称に配置されていること、の2点が挙げられる。
これにより、本発明の加圧ローラは、定着装置に組み込まれて加熱された際に以下のような顕著な作用・効果を奏する。
a.スポンジ層の長手方向における蓄熱量は該蓄熱壁で最大となり、該蓄熱壁から左右の放熱用中空路を経て徐々に放熱される。その結果、スポンジ層は正クラウン形状に熱膨張して、前述のフラット方式で生じる逆クラウン状ギャップを補償するので、十分なニップ幅を確保でき、定着性が改善される。
b.芯金の長手方向において、該蓄熱壁を境として放熱用中空路が左右非対称に延在・配置されるため、スポンジ層の長手方向の圧接負荷が分散される。すなわち、前述のフラット方式にみられる一直線的な応力集中が該蓄熱壁を境として分散され、スポンジ層の耐久性が向上する。
What is characteristic in the present invention is that the sponge layer portion orthogonal to the central portion in the longitudinal direction of the metal core functions as a heat storage wall through which the heat dissipation hollow passage does not penetrate, and the sponge layer is separated from the heat storage wall as a boundary. There are two points, that the heat radiation hollow path extending toward each end is disposed asymmetrically.
As a result, the pressure roller of the present invention exhibits the following remarkable actions and effects when it is incorporated into a fixing device and heated.
a. The heat storage amount in the longitudinal direction of the sponge layer is maximized at the heat storage wall, and is gradually radiated from the heat storage wall through the left and right heat radiation hollow paths. As a result, the sponge layer is thermally expanded into a regular crown shape and compensates for the reverse crown-shaped gap generated by the above-described flat method, so that a sufficient nip width can be secured and the fixing property is improved.
b. In the longitudinal direction of the cored bar, the heat radiation hollow path extends asymmetrically with the heat storage wall as a boundary, so that the pressure contact load in the longitudinal direction of the sponge layer is dispersed. That is, the linear stress concentration found in the above-described flat method is dispersed with the heat storage wall as a boundary, and the durability of the sponge layer is improved.

以下、本発明の定着用加圧ローラの構造について、添付図面を参照しながら説明する。
図1は、本発明に係る定着用加圧ローラの一例を示す縦断面図である。
図2は、本発明に係る定着用加圧ローラの他の態様を示す縦断面図である。
図3は、本発明に係る定着用加圧ローラの製造に使用する押出機の金型(ダイス)である。
図4は、本発明に係る定着用加圧ローラの製造に使用する押出機の金型(ニップル)である。
図5は、本発明に係る定着用加圧ローラのスポンジ層の基となる中空円筒ゴム状弾性体の押出形状である。
図6は、本発明に係る定着用加圧ローラの加熱後の外径寸法を示す特性図(グラフ)である。
図7は、従来の定着用加圧ローラの加熱後の外径寸法を示す特性図(グラフ)である。
図1及び図2において、(1)は芯金、(2)はスポンジ層、(3)は蓄熱壁、(4)は該蓄熱壁から夫々のスポンジ層部分(2a)、(2b)の端部(端面)に向かって延在する放熱用中空路である。ここで、図1におけるスポンジ層(2)の長手方向の蓄熱壁(3)の厚さは、スポンジ層(2)の汎用的な長さ(200mm〜400mm程度)において、0.1mm〜20mmの範囲にあればよい。その場合、放熱用中空路(4)がスポンジ層(2)の中央部を貫通していない形状であるかぎり、図2に示すような凹凸状のものも採用される。要は、放熱用中空路(4)が蓄熱壁(3)を境に左右非対称に配置され且つスポンジ層(2)の中央部で貫通していない形状、すなわち、スポンジ層(2)の長手方向の中央部が最も熱がこもりやすい形状であれば種々の変更が可能である。
次に、放熱用中空路(4)について述べる。該中空路(4)は通常、スポンジ層(2)の半径方向の中点近傍から芯金(1)の周囲の箇所に配置される。その断面は、円形、多角形など必要に応じて選定され、そのときの断面積も、スポンジ層(2)の汎用的な厚み(2mm〜20mm程度)において、1.5mm〜800mmの範囲にあればよい。更に、この断面積は、放熱及び正クラウン形状のスポンジ形成の面から、スポンジ層部分(2a)、(2b)の端端面に向かって徐々に増加するような構造としてもよい。そして、このような放熱用中空路(4)は各スポンジ層部分(2a)、(2b)に多数本、通常は2〜10本を芯金(1)の長手方向に平行、且つその周方向に等角度で配置すればよい。ちなみに、図1及び図2は、4本の放熱用中空路(4)を配置した例である。なお、放熱用中空路(4)自体は必ずしも直線的なものに限られず、必要に応じて螺旋状等の曲線的な形状としてもよい。
最後に、スポンジ層を構成する材料としては、シリコーンゴム発泡体特に硬度(アスカーC)が5〜50程度のシリコーンゴム発泡体が挙げられる。その際、必要に応じて、スポンジ層(2)の外表面には、シリコーンゴム、またはフッ素樹脂ないしゴム等からなる離型層を設けてもよい。
以上、加圧ローラについて述べたが、定着ベルトを使用する構成で、ヒートローラ、定着ローラと加圧ローラの3つで形成される定着装置の場合には、この定着ローラに使用してもよい。
Hereinafter, the structure of the pressure roller for fixing according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a longitudinal sectional view showing an example of a fixing pressure roller according to the present invention.
FIG. 2 is a longitudinal sectional view showing another aspect of the pressure roller for fixing according to the present invention.
FIG. 3 shows a die (die) of an extruder used for manufacturing the pressure roller for fixing according to the present invention.
FIG. 4 shows a die (nipple) of an extruder used for manufacturing a fixing pressure roller according to the present invention.
FIG. 5 shows an extruded shape of a hollow cylindrical rubber-like elastic body that is the basis of the sponge layer of the fixing pressure roller according to the present invention.
FIG. 6 is a characteristic diagram (graph) showing the outer diameter after heating of the fixing pressure roller according to the present invention.
FIG. 7 is a characteristic diagram (graph) showing the outer diameter after heating of a conventional fixing pressure roller.
1 and 2, (1) is a metal core, (2) is a sponge layer, (3) is a heat storage wall, and (4) is an end of each sponge layer portion (2a) and (2b) from the heat storage wall. This is a heat radiation hollow path extending toward the portion (end face). Here, the thickness of the heat storage wall (3) in the longitudinal direction of the sponge layer (2) in FIG. 1 is 0.1 mm to 20 mm in the general-purpose length (about 200 mm to 400 mm) of the sponge layer (2). If it is in range. In that case, as long as the heat radiation hollow path (4) has a shape that does not penetrate the central portion of the sponge layer (2), an uneven shape as shown in FIG. 2 is also employed. The point is that the heat radiation hollow channel (4) is arranged asymmetrically with respect to the heat storage wall (3) and does not penetrate through the center of the sponge layer (2), that is, the longitudinal direction of the sponge layer (2). Various modifications are possible if the central portion of the shape is the shape in which heat is most likely to be trapped.
Next, the heat radiation hollow path (4) will be described. The hollow passage (4) is usually disposed at a location around the cored bar (1) from the vicinity of the midpoint in the radial direction of the sponge layer (2). The cross section is selected as necessary, such as a circle or a polygon, and the cross-sectional area at that time is also in the range of 1.5 mm 2 to 800 mm 2 in the general thickness (about 2 mm to 20 mm) of the sponge layer (2). If it is in. Further, the cross-sectional area may be configured to gradually increase from the surface of the heat dissipation and the formation of the regular crown-shaped sponge toward the end face of the sponge layer portions (2a) and (2b). And, such a heat radiation hollow path (4) is parallel to the longitudinal direction of the cored bar (1), and a large number, usually 2 to 10 in each sponge layer part (2a), (2b), and its circumferential direction. May be arranged at an equal angle. Incidentally, FIG.1 and FIG.2 is an example which has arrange | positioned four hollow paths for heat radiation (4). Note that the heat radiation hollow path (4) itself is not necessarily limited to a straight one, and may have a curved shape such as a spiral shape as necessary.
Finally, examples of the material constituting the sponge layer include a silicone rubber foam, particularly a silicone rubber foam having a hardness (Asker C) of about 5 to 50. At that time, if necessary, a release layer made of silicone rubber, fluororesin, rubber, or the like may be provided on the outer surface of the sponge layer (2).
The pressure roller has been described above. However, in the case of a fixing device that uses a fixing belt and is formed of three parts, a heat roller, a fixing roller, and a pressure roller, the fixing roller may be used. .

次に、本発明に係る加圧ローラの製造方法の例について述べる。
A.図1の加圧ローラの製造例:
a−1 放熱用中空路(4)を左右非対称に配置したスポンジ層(2)の作成
先ず、スポンジ層(2)、すなわち中空円筒状のスポンジ層を作成するための金型を準備する。この金型には、得られるスポンジ層(2)の両端から中央の蓄熱壁(3)近傍までの長さに相当するピンが配置され、尚且つ、これらピンは該スポンジ層(2)の長手方向において、蓄熱壁(3)の厚さに相当する間隙を境として左右非対称に配置される。言うまでもなく、これらのピンは放熱用中空路(4)を形成するためのものである。このような金型にゴム材料を注入後、加硫・発泡することによって、スポンジ層(2)が得られる。
最後に、上記のスポンジ層(2)を、内径がスポンジ層(2)のそれよりも数%(2〜5%程度)大きいステンレス管内部に挿入する。
a−2 芯金(1)の準備
スポンジ層(2)が被覆される芯金(1)の外表面部分にサンドブラスト、洗浄、プライマ処理を施し、最後にRTV等の接着剤を塗布する。
a−3 加圧ローラの組み立て
ステンレス管に挿入しておいたスポンジ層(2)を真空装置に載置して真空引きすることにより、該ステンレス管の内壁に沿う形で拡径する。この拡径状態のスポンジ層(2)の中空貫通孔に芯金(1)を挿入してから、真空引きを解除してスポンジ層(2)を芯金(1)に密着・被覆させ、更に加熱して芯金(1)に塗布していたRTVを硬化させることによって、芯金(1)の外周にスポンジ層(2)を固着させる。
B.図2の加圧ローラの製造例:
先ず、スポンジ層部に複数個の貫通孔(図1では4本)を有する中空円筒状スポンジ体(ゴム発泡体)を準備する。このような中空円筒状スポンジ体は、冒頭で引用した特許文献1、あるいは特開平7−295418号公報等に記載されている。この中空円筒状スポンジ体を、その長手方向の中央部で真半分にカットした後、両カット面にRTV等の接着剤を塗布する。次いで、両カット面の位相を互いに45度に偏らした状態で両者を接合して、スポンジ層(2)を得る。このスポンジ層(2)においては、当初の貫通孔は、本発明で言う、蓄熱壁(3)で隔てられた放熱用中空路(4)に転換されている。すなわち、図1に示すように、その長手方向の中央部と直交する面には、放熱用中空路(4)が貫通していない蓄熱壁(3)が形成され他方、該蓄熱壁(3)を境として左右に分割される各スポンジ層部分(2a)、(2b)には、該蓄熱壁(3)から夫々のスポンジ層部の端面に向かって放熱用中空路(4)が延在し、その際、該中空路(4)は該蓄熱壁(3)を境として左右非対称に延在・配置されている。
以下、上述したa−2、a−3と同様の操作を行う。
Next, an example of a method for manufacturing a pressure roller according to the present invention will be described.
A. Production example of the pressure roller in FIG.
a-1 Preparation of Sponge Layer (2) with Dissipating Hollow Channel (4) Asymmetrically First, a mold for preparing a sponge layer (2), that is, a hollow cylindrical sponge layer is prepared. In this mold, pins corresponding to the length from both ends of the sponge layer (2) obtained to the vicinity of the central heat storage wall (3) are arranged, and these pins are arranged in the longitudinal direction of the sponge layer (2). In the direction, they are arranged asymmetrically with a gap corresponding to the thickness of the heat storage wall (3) as a boundary. Needless to say, these pins are for forming the heat radiation hollow path (4). After injecting the rubber material into such a mold, the sponge layer (2) is obtained by vulcanization and foaming.
Finally, the sponge layer (2) is inserted into a stainless steel tube whose inner diameter is several percent (about 2 to 5%) larger than that of the sponge layer (2).
a-2 Preparation of cored bar (1) The outer surface of the cored bar (1) to be coated with the sponge layer (2) is subjected to sandblasting, washing and primer treatment, and finally an adhesive such as RTV is applied.
a-3 Assembling the pressure roller The sponge layer (2) inserted in the stainless steel tube is placed on a vacuum device and evacuated to expand the diameter along the inner wall of the stainless steel tube. After inserting the cored bar (1) into the hollow through-hole of the expanded sponge layer (2), the vacuuming is released and the sponge layer (2) is adhered and coated on the cored bar (1). The sponge layer (2) is fixed to the outer periphery of the core metal (1) by curing the RTV applied to the core metal (1) by heating.
B. Production example of the pressure roller in FIG.
First, a hollow cylindrical sponge body (rubber foam) having a plurality of through holes (four in FIG. 1) in the sponge layer portion is prepared. Such a hollow cylindrical sponge body is described in Patent Document 1 cited in the beginning or Japanese Patent Application Laid-Open No. 7-295418. After this hollow cylindrical sponge body is cut in half at the center in the longitudinal direction, an adhesive such as RTV is applied to both cut surfaces. Next, the sponge layers (2) are obtained by bonding the two cut surfaces in a state where the phases of the two cut surfaces are deviated from each other by 45 degrees. In this sponge layer (2), the initial through-hole is converted into a heat radiation hollow path (4) separated by a heat storage wall (3) as referred to in the present invention. That is, as shown in FIG. 1, a heat storage wall (3) through which the heat radiation hollow path (4) does not penetrate is formed on the surface orthogonal to the central portion in the longitudinal direction, while the heat storage wall (3) Each of the sponge layer portions (2a) and (2b) divided right and left with a boundary extending from the heat storage wall (3) toward the end surface of each sponge layer portion extends to the heat dissipation hollow passage (4). In this case, the hollow passage (4) extends and is arranged asymmetrically with respect to the heat storage wall (3) as a boundary.
Thereafter, the same operation as the above-described a-2 and a-3 is performed.

以下、実施例および比較例を挙げて、本発明を具体的に説明する。
尚、実施例中の「部」は重量部を示す。
Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples.
In addition, "part" in an Example shows a weight part.

[実施例1]
先ず、ゴム状弾性体からなる中空円筒状スポンジ体(長さ:250mm、厚さ:4mm、外径φ20mm)を以下のようにして形成した。
シリコーンゴム「KE904FU」(信越化学工業株式会社製)100部に発泡剤として「KE−P−13」(信越化学工業株式会社製)を3.0部、低温加硫剤「C−23」(信越化学工業株式会社製)1.0部、高温加硫剤「C−8A」(信越化学工業株式会社製)0.5部と茶色の顔料として「KE−color−BR」(信越化学工業株式会社製)0.5部を均一にそれぞれの添加剤が分散するまで混練をした。その後、シリコーンゴム用押出機先端に、図3、図4に示すような金型を設置して図5に示すような中空形状となるように連続的に押出成形を行った。このとき、押出機先端に設置する金型は、ダイス(5)の中にニップル(6)を入れるように配置し、その際、ニップルには以下の中空ピン;すなわち、中心部に芯金挿入のための貫通孔形成用として、外径12mm、内径3mmの中空ピン(8)1本と、その外周に放熱用中空路(4)形成用として、円周方向に90°の間隔で外径2mm、内径0.5mmの中空ピン(7)4本とを;配置した。続いて、得られた押出成形品を連続して、炉長5m、炉温150℃の炉の中に線速2m/分で通して発泡、加硫をさせ、更に200℃×4時間で二次加硫を行った。最後に、得られた長尺品を長さ250mmにカットして中空円筒状スポンジ体を得た。
このようにして得られたシリコーンゴム中空円筒状スポンジ体をその長手方向の中央部で真半分にカットした後、両カット面にRTV接着剤「TSE322」(GE東芝シリコーン株式会社製)を塗布し、両カット面の位相を互いに45度偏らした状態で両者を接合して、スポンジ層(2)を形成した。更に、このスポンジ層(2)を内径20.7mm、外径27.0mm、長さ280mmのステンレス製管の中に挿入した。
この状態でスポンジ層(2)を真空装置に載置して真空引きすることにより、スポンジ層(2)を拡径させ、更に、拡径した中空孔に表面をプライマ処理したφ12mmの鉄製芯金(1)を挿入した後、真空引きを解除することによりスポンジ層(2)と芯金(1)とを密着・被覆させた。最後に、これを加熱して芯金に塗布していたRTVを硬化させて図1に示すような加圧ローラを作成した。
[Example 1]
First, a hollow cylindrical sponge body (length: 250 mm, thickness: 4 mm, outer diameter φ20 mm) made of a rubber-like elastic body was formed as follows.
100 parts of silicone rubber “KE904FU” (manufactured by Shin-Etsu Chemical Co., Ltd.) 3.0 parts of “KE-P-13” (manufactured by Shin-Etsu Chemical Co., Ltd.) as a foaming agent, low-temperature vulcanizing agent “C-23” ( Shin-Etsu Chemical Co., Ltd.) 1.0 part, high-temperature vulcanizing agent "C-8A" (Shin-Etsu Chemical Co., Ltd.) 0.5 part and brown pigment "KE-color-BR" (Shin-Etsu Chemical Co., Ltd.) 0.5 parts (made by company) was kneaded until each additive was uniformly dispersed. Thereafter, a die as shown in FIGS. 3 and 4 was installed at the tip of the extruder for silicone rubber, and extrusion was continuously performed so as to have a hollow shape as shown in FIG. At this time, the mold installed at the tip of the extruder is arranged so that the nipple (6) is put into the die (5). At that time, the following hollow pin is inserted into the nipple; For forming a through hole for forming a hollow pin (8) having an outer diameter of 12 mm and an inner diameter of 3 mm, and for forming a heat radiation hollow path (4) on the outer periphery thereof, the outer diameter is spaced at 90 ° in the circumferential direction. Two hollow pins (7) having a diameter of 2 mm and an inner diameter of 0.5 mm were arranged. Subsequently, the obtained extrusion-molded product was continuously passed through a furnace having a furnace length of 5 m and a furnace temperature of 150 ° C. at a linear speed of 2 m / min for foaming and vulcanization, and further at 200 ° C. for 4 hours. Subsequent vulcanization was performed. Finally, the obtained long product was cut into a length of 250 mm to obtain a hollow cylindrical sponge body.
The silicone rubber hollow cylindrical sponge body thus obtained was cut in half at the longitudinal center, and then RTV adhesive “TSE322” (manufactured by GE Toshiba Silicone Co., Ltd.) was applied to both cut surfaces. The sponge layers (2) were formed by joining the two cut surfaces in a state where the phases of the cut surfaces were deviated from each other by 45 degrees. Furthermore, this sponge layer (2) was inserted into a stainless steel tube having an inner diameter of 20.7 mm, an outer diameter of 27.0 mm, and a length of 280 mm.
In this state, the sponge layer (2) is placed on a vacuum apparatus and evacuated to expand the diameter of the sponge layer (2), and further, a φ12 mm iron core bar whose surface is primed into the expanded hollow hole. After inserting (1), the sponge layer (2) and the core metal (1) were adhered and coated by releasing the vacuum. Finally, this was heated to cure the RTV that had been applied to the cored bar to produce a pressure roller as shown in FIG.

[比較例1]
上記の実施例1において、加硫後のシリコーンゴム中空スポンジ体をかっとして位相を45度偏らして接着する、という工程を省略する以外は同様の操作を繰り返して、フラット方式の加圧ロールを作成した。
[Comparative Example 1]
In Example 1 above, the same procedure was repeated except for the step of bonding the silicone rubber hollow sponge body after vulcanization with a 45 ° bias, and the flat type pressure roll was removed. Created.

このようにして得られた加圧ローラを、定着装置に組み込んで稼動させた際の加熱後の外径を調べたところ、図6(本発明)、図7(比較例)に示す特性図が得られた。
図6と図7とを比較すると、本発明の加圧ローラの外径は、芯金の長手方向においてほぼ同じであるのに対して、フラット方式の加圧ローラの外径は、中央が撓んでいると言う結果となった。
The outer diameter after heating when the pressure roller thus obtained was installed in a fixing device and operated was examined. The characteristic diagrams shown in FIGS. 6 (present invention) and 7 (comparative example) were obtained. Obtained.
Comparing FIG. 6 and FIG. 7, the outer diameter of the pressure roller of the present invention is substantially the same in the longitudinal direction of the core metal, whereas the outer diameter of the flat type pressure roller is bent at the center. The result was that

本発明の加圧ローラは、プリンターや複写機等の画像定着用の熱定着部に用いられる定着用加圧ローラとして特に有用である。 The pressure roller of the present invention is particularly useful as a pressure roller for fixing used in a heat fixing portion for image fixing such as a printer or a copying machine.

本発明に係る定着用加圧ローラの一例を示す縦断面図である。FIG. 3 is a longitudinal sectional view illustrating an example of a fixing pressure roller according to the present invention. 本発明に係る定着用加圧ローラの他の態様を示す縦断面図である。It is a longitudinal cross-sectional view which shows the other aspect of the pressure roller for fixing concerning this invention. 本発明に係る定着用加圧ローラの製造に使用する押出機の金型(ダイス)である。It is a die (die) of an extruder used for manufacturing a pressure roller for fixing according to the present invention. 本発明に係る定着用加圧ローラの製造に使用する押出機の金型(ニップル)である。It is a die (nipple) of an extruder used for manufacturing a pressure roller for fixing according to the present invention. 本発明に係る定着用加圧ローラのスポンジ層の基となる中空円筒ゴム状弾性体の押出形状である。FIG. 3 is an extruded shape of a hollow cylindrical rubber-like elastic body that is a base of a sponge layer of the pressure roller for fixing according to the present invention. 本発明に係る定着用加圧ローラの加熱後の外径寸法を示す特性図(グラフ)である。FIG. 6 is a characteristic diagram (graph) showing an outer diameter dimension of the fixing pressure roller according to the present invention after heating. 従来の定着用加圧ローラの加熱後の外径寸法を示す特性図(グラフ)である。It is a characteristic view (graph) which shows the outer diameter dimension after the heating of the conventional fixing pressure roller.

符号の説明Explanation of symbols

1 芯金
2 スポンジ層
3 蓄熱壁
4 蓄熱壁から夫々のスポンジ層部分(2a)、(2b)の端部(端面)に向かって延在する放熱用中空路
5 ダイス
6 ニップル
7 中空ピン(放熱用中空路形成ピン)
8 中空ピン(芯金挿入のための中心貫通孔形成ピン)
9 中空円筒ゴム状弾性体
DESCRIPTION OF SYMBOLS 1 Core metal 2 Sponge layer 3 Thermal storage wall 4 The heat dissipation hollow path 5 extended from the thermal storage wall toward the end part (end surface) of each sponge layer part (2a), (2b) 5 Dice 6 Nipple 7 Hollow pin (Heat dissipation) Hollow path forming pin)
8 Hollow pin (pin for forming a central through hole for cored bar insertion)
9 Hollow cylindrical rubber-like elastic body

Claims (5)

芯金の外周に被覆されたスポンジ層に、該芯金の長手方向に平行、且つその周方向に放熱用中空路を設けた定着用加圧ローラであって、該芯金の長手方向の中央部と直交するスポンジ層部は、該放熱用中空路が貫通していない蓄熱壁を形成し、そして、該蓄熱壁を境として該放熱用中空路が左右非対称に延在・配置されていることを特徴とする定着用加圧ローラ。 A fixing pressure roller in which a sponge layer coated on the outer periphery of a core metal is provided with a heat radiation hollow path parallel to the longitudinal direction of the core metal and in the circumferential direction thereof, the center in the longitudinal direction of the core metal The sponge layer portion orthogonal to the portion forms a heat storage wall through which the heat dissipation hollow path does not penetrate, and the heat dissipation hollow path extends and is arranged asymmetrically with respect to the heat storage wall as a boundary. A pressure roller for fixing. 該蓄熱壁の厚みが0.1mm〜20mmである請求項1に記載の定着用加圧ローラ。 The pressure roller for fixing according to claim 1, wherein the heat storage wall has a thickness of 0.1 mm to 20 mm. 該芯金の長手方向と直行する方向での、(断面での)放熱用中空路の断面積が1.5mm〜800mmである請求項1または2に記載の定着用加圧ローラ。 In a direction perpendicular to the longitudinal direction of the metal core, (in cross section) fixing pressure roller according to claim 1 or 2 cross-sectional area in the heat radiation routes is 1.5mm 2 ~800mm 2. 該スポンジ層が、シリコーンゴム発泡体である請求項1〜3のいずれかに記載の定着用加圧ローラ。 The pressure roller for fixing according to claim 1, wherein the sponge layer is a silicone rubber foam. 該スポンジ層の外周面に離型層が被覆されている請求項1〜4のいずれかに記載の定着用加圧ローラ。
The pressure roller for fixing according to any one of claims 1 to 4, wherein a release layer is coated on the outer peripheral surface of the sponge layer.
JP2004053467A 2004-02-27 2004-02-27 Pressure roller for fixing Expired - Fee Related JP4373244B2 (en)

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JP6390306B2 (en) * 2014-09-24 2018-09-19 富士ゼロックス株式会社 ROLL FOR FIXING DEVICE, FIXING DEVICE, AND IMAGE FORMING DEVICE

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