JP2007004029A - Heating roller - Google Patents

Heating roller Download PDF

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Publication number
JP2007004029A
JP2007004029A JP2005186642A JP2005186642A JP2007004029A JP 2007004029 A JP2007004029 A JP 2007004029A JP 2005186642 A JP2005186642 A JP 2005186642A JP 2005186642 A JP2005186642 A JP 2005186642A JP 2007004029 A JP2007004029 A JP 2007004029A
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Prior art keywords
cylindrical body
ring
shaped reinforcing
reinforcing member
heating roller
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JP2005186642A
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Japanese (ja)
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Hideki Kitagawa
英樹 北川
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Kyocera Document Solutions Inc
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Kyocera Mita Corp
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Priority to JP2005186642A priority Critical patent/JP2007004029A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating roller designed such that fitting of ringlike reinforcing members is easy, correct positioning of the ringlike reinforcing members is ensured, and the reinforcement effect of the member is always sufficiently exhibited. <P>SOLUTION: The heating roller 2 includes: a thin-wall cylindrical body 5 heated by a heat source 4 disposed inside the cylindrical body 5; and the ringlike reinforcing members 7 whose circumferential parts 8 are disposed in contact with the internal peripheral face 5a of the cylindrical body 5 and which prevent radial deformation of the cylindrical body. In the heating roller 2, the plurality of ringlike reinforcing members 7 are fixed, via support members 10, to flanges 11 at both ends of the cylindrical body 5 so as to be supported at prescribed intervals in the lengthwise direction of the cylindrical body 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、内部に備えられる熱源によって加熱される薄肉の円筒体と、前記円筒体の内周面に外周部が当接して、前記円筒体の半径方向の変形を防止するリング状補強部材とを備える画像形成装置の加熱用ローラに関する。   The present invention includes a thin cylindrical body that is heated by a heat source provided therein, and a ring-shaped reinforcing member that prevents an outer peripheral portion of the cylindrical body from abutting on an inner peripheral surface of the cylindrical body to prevent radial deformation of the cylindrical body. The present invention relates to a heating roller of an image forming apparatus.

一般に、画像形成装置（複写機、プリンター又はファクシミリあるいはこれらの複合機等）に内蔵されている定着装置は、内部にヒータを内蔵した定着ローラ（加熱用ローラ）と、定着ローラに圧接した加圧ローラとを備えている。この種の定着装置は、トナー像を転写した用紙を、ヒータにより加熱された定着ローラと加圧ローラとの圧接部に通過させて、その熱エネルギーと圧力によってトナーを軟化溶融させて用紙に定着させる。
定着ローラには、加圧ローラにより高い圧力が付与されるので、変形を防ぐために定着ローラは厚肉に形成されていた。しかし、定着ローラを厚肉にすると、熱容量が大きくなるため、定着ローラを加熱するまでに時間が掛かって（立ち上げ時間が長くなる）使い勝手が悪くなると共に、立ち上げ時間が長いので常に電源をＯＮの状態して使用するといった不経済な使用方法（エネルギー消費効率の悪化）が強いられ得るという問題がある。
そこで、定着ローラを薄肉の熱容量の小さい円筒体で構成し、薄肉にした分、その機械的強度を補強するために、複数のリング状補強部材を円筒体の内周面に圧入した定着ローラが考案されている（特許文献１参照）。 In general, a fixing device built in an image forming apparatus (such as a copying machine, a printer, a facsimile machine, or a complex machine of these) has a fixing roller (heating roller) with a built-in heater therein and a pressure that is in pressure contact with the fixing roller. And a roller. In this type of fixing device, a sheet on which a toner image is transferred is passed through a pressure contact portion between a fixing roller heated by a heater and a pressure roller, and the toner is softened and melted by the heat energy and pressure to be fixed on the sheet. Let
Since a high pressure is applied to the fixing roller by the pressure roller, the fixing roller is formed thick to prevent deformation. However, if the fixing roller is thick, the heat capacity increases, so it takes a long time to heat the fixing roller (longer startup time) and the usability deteriorates. There is a problem that an uneconomic usage method (deterioration of energy consumption efficiency) such as use in an ON state can be forced.
Therefore, the fixing roller is composed of a thin cylindrical body having a small heat capacity, and a fixing roller in which a plurality of ring-shaped reinforcing members are press-fitted into the inner peripheral surface of the cylindrical body in order to reinforce the mechanical strength by reducing the thickness. It has been devised (see Patent Document 1).

特許第３３７３６７２号公報Japanese Patent No. 3373672

しかしながら、上記従来例の定着ローラにおいては、複数のリング状補強部材を１枚ずつ円筒体内に圧入しなくてはならないので、組み立て作業が面倒であった。
また、上記従来例においては、各リング状補強部材の位置決めも困難であり、それぞれのリング状補強部材が、常に所定位置にきちんと正確に固定されるものではない。例えば、リング状補強部材が、円筒体の軸心に対して斜めに固定されてしまい、使用の際に十分な補強効果を発揮せず、定着ローラが変形（ロール撓み）し、トナー像がきちんと定着されず用紙が汚れたり、用紙搬送の際に紙しわを生じ得るといった問題を抱えていた。 However, in the above-described conventional fixing roller, a plurality of ring-shaped reinforcing members must be press-fitted into the cylindrical body one by one, so that the assembling work is troublesome.
Further, in the above-described conventional example, it is difficult to position each ring-shaped reinforcing member, and each ring-shaped reinforcing member is not always fixed accurately at a predetermined position. For example, the ring-shaped reinforcing member is fixed obliquely with respect to the axial center of the cylindrical body, and does not exhibit a sufficient reinforcing effect during use, the fixing roller is deformed (rolled), and the toner image is properly formed. There are problems that the paper is not fixed and the paper becomes dirty or paper wrinkles may occur during paper conveyance.

本発明は、上記実情に鑑みてなされたものであって、リング状補強部材の組み付けが容易であり、且つリング状補強部材の位置決めも正確になされ、その補強効果を常に十分に発揮し得る加熱用ローラを提供するものである。   The present invention has been made in view of the above circumstances, and it is easy to assemble the ring-shaped reinforcing member, and the positioning of the ring-shaped reinforcing member is accurately performed, and the heating that can always sufficiently exert the reinforcing effect. A roller is provided.

本発明の第１特徴構成は、内部に備えられる熱源によって加熱される薄肉の円筒体と、前記円筒体の内周面に外周部が当接して、前記円筒体の半径方向の変形を防止するリング状補強部材とを備える画像形成装置の加熱用ローラであって、複数の前記リング状補強部材が、前記円筒体の長手方向に所定間隔で支持されるように、支持部材を介して前記円筒体の両端部に設けられているフランジ部に固定されている加熱用ローラである点にある。   In the first characteristic configuration of the present invention, a thin-walled cylindrical body heated by a heat source provided therein and an outer peripheral portion abut on the inner peripheral surface of the cylindrical body to prevent the cylindrical body from deforming in the radial direction. A heating roller of an image forming apparatus including a ring-shaped reinforcing member, wherein the plurality of ring-shaped reinforcing members are supported via the support member at predetermined intervals in the longitudinal direction of the cylindrical body. It is in the point which is a roller for a heating currently fixed to the flange part provided in the both ends of the body.

〔作用及び効果〕
本発明の加熱用ローラは、薄肉の円筒体を備えているので、熱容量が小さく、内部に備えられる熱源（ヒーター）によって加熱用ローラを十分に加熱するのに要する時間とエネルギーとを節約することができる。その結果、画像形成装置の立ち上げ時間も短縮されるので使い勝手も良くなり、尚且つエネルギー消費効率も高くなり省エネルギー化が図れ、コスト削減にもつながる。さらに、本発明の加熱用ローラは、前記円筒体の内周面に外周部が当接して、前記円筒体の半径方向の変形を防止するリング状補強部材を備えているので、加圧ローラにより圧力が付与されても変形し難い。
また、本発明の特徴として、複数の前記リング状補強部材が、前記円筒体の長手方向に所定間隔で支持されるように、支持部材を介して前記円筒体の両端部に設けられているフランジ部に固定されている。従って、複数のリング状補強部材が支持部材を介して所定間隔に支持されるので、位置決めが正確になされ得、リング状補強部材が円筒体の軸心に対して斜めに固定されて、その補強効果が低減されるといったこともない。
さらに、リング状補強部材は、支持部材を介して前記円筒体の両端部に設けられているフランジ部に固定されているので、例えば、リング状補強部材と、支持部材と、フランジ部とを予め組み立てておくことが可能であり、あとはその組み立てたものをそのまま円筒体内に挿入すれば、本発明の加熱用ローラを容易に製造することができる。 [Action and effect]
Since the heating roller of the present invention has a thin cylindrical body, the heat capacity is small, and the time and energy required to sufficiently heat the heating roller by a heat source (heater) provided therein is saved. Can do. As a result, the start-up time of the image forming apparatus is shortened, so that it is easy to use, energy efficiency is increased, energy saving is achieved, and cost is reduced. Furthermore, the heating roller according to the present invention includes a ring-shaped reinforcing member that prevents the cylindrical body from deforming in the radial direction by contacting the outer peripheral portion with the inner peripheral surface of the cylindrical body. Even if pressure is applied, it is difficult to deform.
Further, as a feature of the present invention, flanges provided at both ends of the cylindrical body via support members so that the plurality of ring-shaped reinforcing members are supported at predetermined intervals in the longitudinal direction of the cylindrical body. It is fixed to the part. Accordingly, since the plurality of ring-shaped reinforcing members are supported at predetermined intervals via the supporting members, the positioning can be accurately performed, and the ring-shaped reinforcing members are fixed obliquely with respect to the axial center of the cylindrical body, and the reinforcement The effect is not reduced.
Furthermore, since the ring-shaped reinforcing member is fixed to the flange portions provided at both ends of the cylindrical body via the support member, for example, the ring-shaped reinforcing member, the support member, and the flange portion are previously connected. The heating roller of the present invention can be easily manufactured by inserting the assembled product into the cylindrical body as it is.

本発明の第２特徴構成は、前記リング状補強部材の外周部に複数の突起部が設けられており、前記突起部が、径方向の外側に突出して前記円筒体の内周面に圧接するように付勢されている請求項１に記載の加熱用ローラである点にある。   According to a second characteristic configuration of the present invention, a plurality of protrusions are provided on the outer peripheral portion of the ring-shaped reinforcing member, and the protrusion protrudes radially outward to press against the inner peripheral surface of the cylindrical body. The heating roller according to claim 1, which is biased as described above.

〔作用及び効果〕
リング状補強部材の外周部に複数の突起部が設けられており、前記突起部が、径方向の外側に突出して前記円筒体の内周面に圧接するように付勢されているので、円筒体内周面に圧接するリング状補強部材の外周部の面積が、その外周部の全周面から各突起部の先端部に限定されて小さくなる。
その結果、円筒体に加えられた熱が、リング状補強部材に伝熱し難くなり、加熱用ローラ表面の温度分布がより均一になって定着性能が向上すると共に、リング状補強部材を含めた加熱用ローラの熱容量がより小さくなり、より一層の立ち上げ時間の短縮化や省エネルギー化を図ることが可能となる。 [Action and effect]
A plurality of protrusions are provided on the outer periphery of the ring-shaped reinforcing member, and the protrusions are biased so as to protrude outward in the radial direction and press-contact with the inner peripheral surface of the cylindrical body. The area of the outer peripheral portion of the ring-shaped reinforcing member that comes into pressure contact with the peripheral surface of the body is limited from the entire peripheral surface of the outer peripheral portion to the tip portion of each protrusion, and becomes smaller.
As a result, the heat applied to the cylindrical body becomes difficult to transfer to the ring-shaped reinforcing member, the temperature distribution on the surface of the heating roller becomes more uniform, fixing performance is improved, and heating including the ring-shaped reinforcing member is performed. The heat capacity of the roller for use becomes smaller, and it becomes possible to further shorten the start-up time and save energy.

以下に本発明の実施の形態を図面に基づいて説明する。   Embodiments of the present invention will be described below with reference to the drawings.

〔実施形態〕
図１は、本発明の定着ローラ２（加熱用ローラ）を備える定着装置１を概略的に示した横断面図であり、図２は、同じく本発明の定着ローラ２を備える定着装置１の縦断面図である。
定着装置１は、アルミニウム等の熱伝導率の良い薄肉の円筒体５からなる定着ローラ２と、定着ローラ２に圧接する加圧ローラ３とから主に構成されており、両ローラ２、３は、ベアリング等の軸受けを備える一対の枠体９により、軸心周りに回転自在に支持されている。 Embodiment
FIG. 1 is a cross-sectional view schematically showing a fixing device 1 including a fixing roller 2 (heating roller) according to the present invention. FIG. 2 is a longitudinal section of the fixing device 1 also including the fixing roller 2 according to the present invention. FIG.
The fixing device 1 is mainly composed of a fixing roller 2 made of a thin cylindrical body 5 having good thermal conductivity such as aluminum, and a pressure roller 3 in pressure contact with the fixing roller 2. The pair of frames 9 having bearings such as bearings are supported so as to be rotatable around the axis.

定着ローラ２の内部には、定着ローラ２を加熱する熱源としてのヒータ４が円筒体５の長手方向全体にわたって、その軸心に位置するように固定される。
さらに、定着ローラの円筒体５の内部には、円筒体５の半径方向の変形を防止するためのリング状補強部材７が、円筒体５長手方向の所定位置に４箇所設けられており、リング状補強部材７の外径の大きさは、円筒体５の内径の大きさと同程度であり、円筒体の内周面５ａにリング状補強部材７の外周部８が当接し得る構成となっている。
また、リング状補強部材７には、図３に示すように、円筒状の支持部材１０を通す円型の軸挿通孔７ａが設けられており、リング状補強部材７は、この支持部材１０を介して、円筒体５の両端部に設けられているフランジ部１１に固定される。 Inside the fixing roller 2, a heater 4 as a heat source for heating the fixing roller 2 is fixed so as to be positioned at the axial center of the entire cylindrical body 5 in the longitudinal direction.
Further, inside the cylindrical body 5 of the fixing roller, four ring-shaped reinforcing members 7 for preventing deformation of the cylindrical body 5 in the radial direction are provided at predetermined positions in the longitudinal direction of the cylindrical body 5. The outer diameter of the cylindrical reinforcing member 7 is approximately the same as the inner diameter of the cylindrical body 5, and the outer peripheral portion 8 of the ring-shaped reinforcing member 7 can come into contact with the inner peripheral surface 5a of the cylindrical body. Yes.
In addition, as shown in FIG. 3, the ring-shaped reinforcing member 7 is provided with a circular shaft insertion hole 7 a through which a cylindrical support member 10 passes. The ring-shaped reinforcing member 7 includes the support member 10. And fixed to the flange portions 11 provided at both ends of the cylindrical body 5.

定着ローラ２の両端に設けられるフランジ部１１は、主として小径部１１ｃと大径部１１ｄとから構成されており、ヒータ４を通すための孔１１ｂと、支持部材１０の端部を嵌合固定可能な嵌め込み穴１１ａとが設けられている。また、大径部１１ｄの外径の大きさは、円筒体５の内径の大きさと同程度であり、内周面５ａに大径部１１ｄの外周部が当接し得る構成となっている。そして、枠体９に備えられたベアリング１３で小径部１１ｃを軸受けすることにより定着ローラ２が回転自在に支持される。   The flange portions 11 provided at both ends of the fixing roller 2 are mainly composed of a small diameter portion 11c and a large diameter portion 11d, and the hole 11b for passing the heater 4 and the end portion of the support member 10 can be fitted and fixed. A fitting hole 11a is provided. In addition, the outer diameter of the large diameter portion 11d is approximately the same as the inner diameter of the cylindrical body 5, and the outer peripheral portion of the large diameter portion 11d can come into contact with the inner peripheral surface 5a. The fixing roller 2 is rotatably supported by bearing the small-diameter portion 11 c with a bearing 13 provided in the frame body 9.

図３は、リング状補強部材７を支持部材１０の所定位置に固定する様子を示している。支持部材１０の外周面には、その軸心方向と直交する方向に、Ｃリング１２を装着可能なリング溝１０ａが、各リング状補強部材７の所定の設置位置に対応して２箇所ずつ設けられている（但し、フランジ部１１に接するリング状補強部材７については１箇所のみ）。この２つのリング溝１０ａの幅Ｔはリング状補強部材７の厚さｔと同程度であり、またリング溝１０ａに装着した際のＣリング１２の外径は、軸挿通孔７ａの直径よりも大きく構成されている。従って、リング状補強部材７を、その軸挿通孔７ａを介して、支持部材１０のリング溝１０ａの設けてある所定位置まで通した後、各リング溝１０ａにＣリング１２を装着すれば、２つのＣリング１２によってリング状補強部材７が支持部材１０の所定位置で挟持固定される。   FIG. 3 shows how the ring-shaped reinforcing member 7 is fixed to a predetermined position of the support member 10. On the outer peripheral surface of the support member 10, two ring grooves 10 a in which the C-ring 12 can be mounted are provided in two directions corresponding to predetermined installation positions of the ring-shaped reinforcing members 7 in a direction perpendicular to the axial direction. (However, only one portion of the ring-shaped reinforcing member 7 in contact with the flange portion 11). The width T of the two ring grooves 10a is approximately the same as the thickness t of the ring-shaped reinforcing member 7, and the outer diameter of the C-ring 12 when attached to the ring groove 10a is larger than the diameter of the shaft insertion hole 7a. It is composed largely. Accordingly, after the ring-shaped reinforcing member 7 is passed through the shaft insertion hole 7a to a predetermined position where the ring groove 10a of the support member 10 is provided, the C-ring 12 is attached to each ring groove 10a. The ring-shaped reinforcing member 7 is sandwiched and fixed at a predetermined position of the support member 10 by the two C rings 12.

なお、本実施形態においては、リング状補強部材７に、円型の軸挿通孔７ａを２箇所設けており（リング状補強部材７の円の直径の両端部）、円筒状の支持部材１０を２本通す構成となっているので、一つのリング状補強部材７は、合計４つのＣリング１２で挟持固定される（但し、フランジ部１１に接するリング状補強部材７については、２つのＣリング１２とフランジ部１１とで挟持固定される）。しかし本発明はこれに限定されるものでなく、リング状補強部材７が支持部材１０の所定位置で支持固定され得る構成であるならば、リング状補強部材７に設ける軸挿通孔７ａや支持部材１０についての形状や数は、必要に応じて適宜設定することができる。   In the present embodiment, the ring-shaped reinforcing member 7 is provided with two circular shaft insertion holes 7a (both ends of the diameter of the circle of the ring-shaped reinforcing member 7), and the cylindrical support member 10 is attached to the ring-shaped reinforcing member 7. Since two rings are passed, one ring-shaped reinforcing member 7 is sandwiched and fixed by a total of four C-rings 12 (however, two ring-shaped reinforcing members 7 that are in contact with the flange portion 11 are 12 and the flange portion 11). However, the present invention is not limited to this, and if the ring-shaped reinforcing member 7 can be supported and fixed at a predetermined position of the support member 10, the shaft insertion hole 7 a provided in the ring-shaped reinforcing member 7 and the support member are provided. The shape and number of 10 can be appropriately set as necessary.

本発明の定着ローラ２を組み立てる際は、例えば、まず必要な数のリング状補強部材７を、その軸挿通孔７ａを介して支持部材１０に通して、それぞれを所定位置にてＣリング１２で固定する。次いで、支持部材１０の両端を、フランジ部１１の嵌め込み穴１１ａに嵌合させて両端を固定し、それをそのまま円筒体５内に挿入する。   When assembling the fixing roller 2 of the present invention, for example, a required number of ring-shaped reinforcing members 7 are first passed through the support member 10 through the shaft insertion holes 7a, and each is fixed by a C-ring 12 at a predetermined position. Fix it. Next, both ends of the support member 10 are fitted into the fitting holes 11 a of the flange portion 11 to fix both ends, and are inserted into the cylindrical body 5 as they are.

上記のリング状補強部材７、支持部材１０、Ｃリング１２及びフランジ部１１は、円筒体５と同等以上の熱伝導率を有する材料（例えば、アルミニウムやある種のセラミックス等）で形成されることが望ましい。   The ring-shaped reinforcing member 7, the support member 10, the C ring 12, and the flange portion 11 are formed of a material having a thermal conductivity equal to or higher than that of the cylindrical body 5 (for example, aluminum or some ceramics). Is desirable.

また、本実施形態においては、リング状補強部材７を定着ローラ２内に円筒体５の軸心に沿って４箇所設ける構成となっているが、これに限定されるものではなく、支持部材１０を介してフランジ部１１に固定可能であり、円筒体５の半径方向の変形を防止し得、尚且つ円筒体表面の温度分布に偏りを生じないような構成であるならば、リング状補強部材７の数は、必要に応じて適宜設定することが可能である。また、リング状補強部材７のリング幅や厚さに関しても同様であり、支持部材１０を介してフランジ部１１に固定可能であり、円筒体５の半径方向の変形を防止し得、尚且つ円筒体表面の温度分布に偏りを生じないような構成であるならば、必要に応じて適宜設定することが可能である。   Further, in the present embodiment, the ring-shaped reinforcing member 7 is provided at four locations along the axial center of the cylindrical body 5 in the fixing roller 2. However, the present invention is not limited to this, and the support member 10 is not limited thereto. The ring-shaped reinforcing member can be fixed to the flange portion 11 via the flange 11, can prevent the cylindrical body 5 from being deformed in the radial direction, and does not cause a bias in the temperature distribution on the cylindrical body surface. The number of 7 can be appropriately set as necessary. The same applies to the ring width and thickness of the ring-shaped reinforcing member 7, which can be fixed to the flange portion 11 via the support member 10 and can prevent the cylindrical body 5 from being deformed in the radial direction. If the configuration is such that there is no bias in the temperature distribution on the body surface, it can be set as necessary.

〔別実施形態〕
図４〜６は、本発明の定着ローラ２（加熱用ローラ）の別実施形態を示している。
本発明の別実施形態における定着ローラ２は、リング状補強部材７及び支持部材１０以外の構成は、上述の実施形態と略同様である。 [Another embodiment]
4 to 6 show another embodiment of the fixing roller 2 (heating roller) of the present invention.
The fixing roller 2 according to another embodiment of the present invention is substantially the same as the above-described embodiment except for the ring-shaped reinforcing member 7 and the support member 10.

図４及び図５に示されるように、別実施形態のリング状補強部材７には、その外周部に５つの収容穴８ｃが設けられており、それらの収容穴８ｃは、下部にバネ部材８ｂを設けた円錐状の突起部８ａを備えている。突起部８ａは、通常はリング状補強部材７の径方向の外側に突出しているが、上方から押さえつけると、バネ部材８ｂの収縮により収容穴８ｃの内部に収容され得る構成となっている。   As shown in FIGS. 4 and 5, the ring-shaped reinforcing member 7 of another embodiment is provided with five receiving holes 8 c on the outer peripheral portion thereof, and these receiving holes 8 c are formed at the lower part with spring members 8 b. A conical protrusion 8a provided with a The protrusion 8a normally protrudes outward in the radial direction of the ring-shaped reinforcing member 7, but when pressed from above, the protrusion 8a can be accommodated inside the accommodation hole 8c by contraction of the spring member 8b.

また、突起部８ａを収容穴８ｃ内に完全に収容したときのリング状補強部材７の外径は、円筒体５の内径よりも小さく、また、突起部８ａが収容穴８ｃから突出している状態において、突起部８ａの先端を含むリング状補強部材７の外径の大きさは、円筒体５の内径よりも大きくなるよう構成されている。   Further, the outer diameter of the ring-shaped reinforcing member 7 when the projection 8a is completely accommodated in the accommodation hole 8c is smaller than the inner diameter of the cylindrical body 5, and the projection 8a protrudes from the accommodation hole 8c. The outer diameter of the ring-shaped reinforcing member 7 including the tip of the protrusion 8 a is configured to be larger than the inner diameter of the cylindrical body 5.

従って、別実施形態の定着ローラ２を組み立てる際、リング状補強部材７を円筒体５に挿入すると、図４及び図５に示されるように、バネ部材８ｂの収縮により円筒体５の内径に合わせて突起部８ａが収容穴８ｃ内に収容される。そして、挿入後の突起部８ａは、バネ部材８ｂによりリング状補強部材７の径方向の外側に突出し、円筒体の内周面５ａに圧接するように付勢され、突起部８ａの先端部のみが、円筒体５の内周面５ａと当接する。   Therefore, when assembling the fixing roller 2 of another embodiment, when the ring-shaped reinforcing member 7 is inserted into the cylindrical body 5, as shown in FIGS. 4 and 5, the spring member 8b contracts to match the inner diameter of the cylindrical body 5. Thus, the protruding portion 8a is received in the receiving hole 8c. Then, the protrusion 8a after insertion protrudes outward in the radial direction of the ring-shaped reinforcing member 7 by the spring member 8b and is urged so as to come into pressure contact with the inner peripheral surface 5a of the cylindrical body, and only the tip of the protrusion 8a. Is in contact with the inner peripheral surface 5 a of the cylindrical body 5.

尚、収容穴８ｃと突起部８ａの形状や数については、上述されたものに限定されるものでなく、円筒体５の半径方向の変形を防止し得、尚且つ円筒体５表面の温度分布に偏りを生じないような構成であるならば、必要に応じて適宜設定することができる。   The shape and number of the receiving holes 8c and the protrusions 8a are not limited to those described above, and the cylindrical body 5 can be prevented from being deformed in the radial direction, and the temperature distribution on the surface of the cylindrical body 5 can be prevented. If it is the structure which does not produce a bias | inclination, it can set suitably as needed.

図６は、本発明の別実施形態における定着ローラ２の縦断面図と、定着ローラ２内に設けられた４つのリング状補強部材７を、定着ローラ２の軸心方向から見たときの側面図とを示している。   FIG. 6 is a longitudinal sectional view of the fixing roller 2 according to another embodiment of the present invention, and a side view when the four ring-shaped reinforcing members 7 provided in the fixing roller 2 are viewed from the axial direction of the fixing roller 2. FIG.

尚、図５〜６に示す別実施形態のリング状補強部材７においては、その両面に軸穴７ｂが設けられており、支持部材１０の端部がその軸穴７ｂに嵌合し得るように構成されている。そして先の実施形態とは異なり、支持部材１０が軸心方向に複数に分割されおり、各支持部材１０の長さは、各リング状補強部材７が円筒体５長手方向の所定位置に支持固定されるように調整されている。   In addition, in the ring-shaped reinforcement member 7 of another embodiment shown to FIGS. 5-6, the shaft hole 7b is provided in the both surfaces, and the edge part of the support member 10 can be fitted to the shaft hole 7b. It is configured. Unlike the previous embodiment, the support member 10 is divided into a plurality of parts in the axial direction, and the length of each support member 10 is such that each ring-shaped reinforcing member 7 is supported and fixed at a predetermined position in the longitudinal direction of the cylindrical body 5. Have been adjusted to be.

この別実施形態の定着ローラ２を組み立てるには、まずリング状補強部材７の軸穴７ｂに支持部材１０の端部を嵌め込み、次いで、支持部材１０のもう一方の端部に別のリング状補強部材７を嵌め込み、さらにその別のリング状補強部材７のもう片方面の軸穴７ｂに、また別の支持部材１０を嵌め込むといった具合に、リング状補強部材７と支持部材１０とを交互に嵌め込んで固定するのを繰り返していく。最後に、そうして組み上がったリング状補強部材７と支持部材１０との構造物を円筒体５内に挿入し、その両端をフランジ部１１で挟持固定する。尚、この別実施形態のリング状補強部材７をフランジ部１１に固定する方法は、これに限定されるものでなく、先の実施形態にて示したように、支持部材１０を分割せず、Ｃリングを用いる構成を採用することも可能である。   In order to assemble the fixing roller 2 of this other embodiment, first, the end of the support member 10 is fitted into the shaft hole 7 b of the ring-shaped reinforcing member 7, and then another ring-shaped reinforcing member is mounted on the other end of the support member 10. The ring-shaped reinforcing member 7 and the supporting member 10 are alternately arranged such that the member 7 is fitted, and another supporting member 10 is fitted into the shaft hole 7b on the other side of the other ring-shaped reinforcing member 7. Insert and fix repeatedly. Finally, the assembled structure of the ring-shaped reinforcing member 7 and the supporting member 10 is inserted into the cylindrical body 5, and both ends thereof are clamped and fixed by the flange portions 11. In addition, the method of fixing the ring-shaped reinforcing member 7 of this another embodiment to the flange portion 11 is not limited to this, and as shown in the previous embodiment, the support member 10 is not divided, It is also possible to adopt a configuration using a C-ring.

また、図６に示されるように、リング状補強部材７の外周部に設けられた５つの突起部（８ａ-１〜８ａ−５）は、定着ローラ２の軸心方向からみたときに、それぞれの突起部が互いに重ならないように、軸心周りに少しずつずらされた状態で固定されている。各リング状補強部材７を上述のように配置することで、隣り合う突起部８ａの間で、円筒体５の表面に凹形状が発生するのを防止することができる。   Further, as shown in FIG. 6, the five protrusions (8 a-1 to 8 a-5) provided on the outer peripheral portion of the ring-shaped reinforcing member 7 are respectively seen from the axial direction of the fixing roller 2. The protrusions are fixed so as to be shifted little by little around the axis so that they do not overlap each other. By disposing each ring-shaped reinforcing member 7 as described above, it is possible to prevent the concave shape from being generated on the surface of the cylindrical body 5 between the adjacent protruding portions 8a.

（その他の実施形態）
上述の２つの実施形態における本発明の加熱用ローラは、定着ローラに適用した構成としてあるが、これに限定されるものではなく、例えば、本発明の加熱用ローラは、図７に示されるように、ベルト式の定着装置１の外部加熱ローラ１４において適用することも可能である。
定着装置１は、アルミニウム等の熱伝導率の良い薄肉の円筒体５からなる外部加熱ローラ１４（加熱用ローラ）、定着ローラ２、定着ローラ２に圧接する加圧ローラ３とから主に構成されており、これら３種類のローラは、ベアリング等の軸受けを備える一対の枠体により、軸心周りに回転自在に支持されている（図示せず）。尚、外部加熱ローラ１４の構成については、上述の２つの実施形態における定着ローラと略同様であり、その内部には、熱源としてのヒータ４と、円筒体５の半径方向の変形を防止するためのリング状補強部材７が設けられている。 (Other embodiments)
The heating roller of the present invention in the above two embodiments is applied to the fixing roller, but is not limited to this. For example, the heating roller of the present invention is as shown in FIG. In addition, it can be applied to the external heating roller 14 of the belt-type fixing device 1.
The fixing device 1 is mainly composed of an external heating roller 14 (heating roller) made of a thin cylindrical body 5 having a good thermal conductivity such as aluminum, a fixing roller 2, and a pressure roller 3 in pressure contact with the fixing roller 2. These three types of rollers are supported by a pair of frame bodies including bearings such as bearings so as to be rotatable about the axis (not shown). The configuration of the external heating roller 14 is substantially the same as that of the fixing roller in the above-described two embodiments, and the heater 4 as a heat source and the cylindrical body 5 are prevented from being deformed in the radial direction. The ring-shaped reinforcing member 7 is provided.

図７に示されるように、循環運動する定着ベルト１５が、定着ローラ２及び外部過熱ローラ１４の間に巻き掛けられており、トナー像を転写した用紙を、ヒータ４により加熱された定着ベルト１５と、加圧ローラ３との圧接部に通過させて、その熱エネルギーと圧力によってトナーを軟化溶融させて用紙に定着させる。   As shown in FIG. 7, a circulating fixing belt 15 is wound around the fixing roller 2 and the external superheater roller 14, and the fixing belt 15 is heated by the heater 4 on the sheet on which the toner image is transferred. And the toner is softened and melted by the heat energy and pressure and fixed on the paper.

本発明の定着ローラを備える定着装置の横断面図Cross-sectional view of a fixing device provided with the fixing roller of the present invention 本発明の定着ローラを備える定着装置の縦断面図FIG. 3 is a longitudinal sectional view of a fixing device including the fixing roller of the present invention. 本発明の定着ローラにおけるリング状補強部材の固定方法を示した斜視図The perspective view which showed the fixing method of the ring-shaped reinforcement member in the fixing roller of this invention 本発明の別実施形態における円筒体に挿入後のリング状補強部材の横断面図Cross-sectional view of a ring-shaped reinforcing member after insertion into a cylindrical body in another embodiment of the present invention 本発明の別実施形態における円筒体に挿入後のリング状補強部材の縦断面図The longitudinal cross-sectional view of the ring-shaped reinforcement member after inserting in the cylindrical body in another embodiment of this invention 本発明の別実施形態における定着ローラの縦断面図と、定着ローラ内に設けられた４つのリング状補強部材を、定着ローラの軸心方向から見たときの側面図FIG. 6 is a longitudinal sectional view of a fixing roller according to another embodiment of the present invention, and a side view when four ring-shaped reinforcing members provided in the fixing roller are viewed from the axial direction of the fixing roller. 本発明のその他の実施形態を示した横断面図Cross-sectional view showing another embodiment of the present invention

符号の説明Explanation of symbols

１ 定着装置
２ 定着ローラ
３ 加圧ローラ
４ ヒータ
５ 円筒体
５ａ 内周面
７ リング状補強部材
７ａ 軸挿通孔
７ｂ 軸穴
８ 外周部
８ａ 突起部
８ｂ バネ部材
８ｃ 収容穴
９ 枠体
１０ 支持部材
１０ａ リング溝
１１ フランジ部
１１ａ 嵌め込み穴
１１ｂ 孔
１１ｃ 小径部
１１ｄ 大径部
１２ Ｃリング
１３ ベアリング（軸受け）
１４ 外部加熱ローラ
１５ 定着ベルト DESCRIPTION OF SYMBOLS 1 Fixing device 2 Fixing roller 3 Pressure roller 4 Heater 5 Cylindrical body 5a Inner peripheral surface 7 Ring-shaped reinforcement member 7a Shaft insertion hole 7b Shaft hole 8 Outer peripheral portion 8a Protruding portion 8b Spring member 8c Housing hole 9 Frame body 10 Support member 10a Ring groove 11 Flange portion 11a Fitting hole 11b Hole 11c Small diameter portion 11d Large diameter portion 12 C ring 13 Bearing (bearing)
14 External heating roller 15 Fixing belt

Claims (2)

内部に備えられる熱源によって加熱される薄肉の円筒体と、前記円筒体の内周面に外周部が当接して、前記円筒体の半径方向の変形を防止するリング状補強部材とを備える画像形成装置の加熱用ローラであって、
複数の前記リング状補強部材が、前記円筒体の長手方向に所定間隔で支持されるように、支持部材を介して前記円筒体の両端部に設けられているフランジ部に固定されている加熱用ローラ。 Image forming comprising: a thin cylindrical body heated by a heat source provided inside; and a ring-shaped reinforcing member whose outer peripheral portion abuts on the inner peripheral surface of the cylindrical body and prevents deformation of the cylindrical body in the radial direction A heating roller for the device,
A plurality of the ring-shaped reinforcing members are fixed to flange portions provided at both ends of the cylindrical body via support members so that the ring-shaped reinforcing members are supported at predetermined intervals in the longitudinal direction of the cylindrical body. roller. 前記リング状補強部材の外周部に複数の突起部が設けられており、前記突起部が、径方向の外側に突出して前記円筒体の内周面に圧接するように付勢されている請求項１に記載の加熱用ローラ。   A plurality of protrusions are provided on the outer periphery of the ring-shaped reinforcing member, and the protrusions are urged so as to protrude outward in the radial direction and press-contact with the inner peripheral surface of the cylindrical body. 2. The heating roller according to 1.
JP2005186642A 2005-06-27 2005-06-27 Heating roller Pending JP2007004029A (en)

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Publication Number Publication Date
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016114810A (en) * 2014-12-16 2016-06-23 京セラドキュメントソリューションズ株式会社 Fixation device and image formation device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016114810A (en) * 2014-12-16 2016-06-23 京セラドキュメントソリューションズ株式会社 Fixation device and image formation device

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