JP3796607B2 - Fixing device - Google Patents

Fixing device Download PDF

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JP3796607B2
JP3796607B2 JP2003372188A JP2003372188A JP3796607B2 JP 3796607 B2 JP3796607 B2 JP 3796607B2 JP 2003372188 A JP2003372188 A JP 2003372188A JP 2003372188 A JP2003372188 A JP 2003372188A JP 3796607 B2 JP3796607 B2 JP 3796607B2
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bearing
roller
heat generating
fixing device
heating roller
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JP2004110064A (en
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靖 木内
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Ricoh Co Ltd
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Ricoh Co Ltd
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  • Rolls And Other Rotary Bodies (AREA)

Description

本発明は、複写装置，プリンタ装置，ファクシミリ装置等に適用され、記録紙に画像を定着させるための定着装置に関する。   The present invention relates to a fixing device that is applied to a copying machine, a printer device, a facsimile machine, and the like and fixes an image on a recording sheet.

複写機等においては、記録紙にトナー像を定着させるために、トナー像が形成された記録紙に対して加熱，加圧する定着装置が備えられている。   A copying machine or the like is provided with a fixing device that heats and pressurizes the recording paper on which the toner image is formed in order to fix the toner image on the recording paper.

この種の定着装置としては、特許文献１記載のものがある。この公報の記載によれば、加熱ローラと加圧ローラの軸受を半割構造としたことによって、軸受をローラの後に組み込むことが可能となり、組立工数の短縮、自動化組立の簡略化を図ることができるといった技術が開示されている。   As this type of fixing device, there is one described in Patent Document 1. According to the description of this publication, the bearing of the heating roller and the pressure roller has a halved structure, so that the bearing can be incorporated after the roller, thereby reducing the number of assembling steps and simplifying the automated assembly. Techniques that can be made are disclosed.

図８は従来の定着装置の要部の断面を示す正面図、図９は図８の定着装置の側断面を示す側面図であり、１は発熱ローラ、２は発熱ローラ１に当接する加圧ローラ、３は発熱ローラ１を支持する半割構造の軸受、４は軸受３の支持部材、５は発熱ローラ１の駆動手段を示す。加圧ローラ２は図示しない付勢手段によって発熱ローラ１側に付勢されており、その結果発熱ローラ１と加圧ローラ２との間にニップ部が形成されている。   8 is a front view showing a cross section of a main part of a conventional fixing device, FIG. 9 is a side view showing a side cross section of the fixing device of FIG. 8, 1 is a heat roller, and 2 is a pressure applied to the heat roller 1 A roller 3 is a half-structure bearing for supporting the heat roller 1, 4 is a support member for the bearing 3, and 5 is a drive means for the heat roller 1. The pressure roller 2 is urged toward the heat roller 1 by an urging means (not shown). As a result, a nip portion is formed between the heat roller 1 and the pressure roller 2.

そして、組み付け時には、まず図示しないフレームに加圧ローラ２を組み付け、次に発熱ローラ１を組み付け、さらに発熱ローラ１上に軸受３を載置した後に支持部材４を組み付けることによって、定着装置の主要部分が構成される。
実開平２−１２６１５９号公報 実願平２−７２６２号（実開平３−９８３１８号）のマイクロフィルム At the time of assembly, first, the pressure roller 2 is assembled to a frame (not shown), the heat generating roller 1 is assembled, the bearing 3 is mounted on the heat generating roller 1, and then the support member 4 is assembled. Part is composed.
Japanese Utility Model Publication No. 2-126159 Microfilm of Japanese Utility Model Application No. 2-7262 (Japanese Utility Model Application Publication No. 3-98318)

しかしながら、図８に示す構成では、製造時においては組立工数の短縮、自動化組立の簡略化を図ることができるが、メンテナンス時においては軸受３が不安定な状態にあるため、特に手作業による軸受３に支持部材４を組み付ける作業が大変困難なものになる。   However, the configuration shown in FIG. 8 can reduce the number of assembling steps and simplify the automated assembly at the time of manufacture, but the bearing 3 is in an unstable state at the time of maintenance. The work of assembling the support member 4 to 3 becomes very difficult.

また、軸受３は耐熱性に優れた比較的高価な部材であるため、半割構造にすることにより材料費の削減にも寄与することになる。しかし、半割構造にすることにより、熱の影響で変形しやすくなり、特に軸受３の両端部が発熱ローラ１に対し必要以上の圧力をかけることにより、その結果発熱ローラ１の回転が妨げられ、線速が変化し、画像の乱れやジャムが発生することもあり得る。   Further, since the bearing 3 is a relatively expensive member having excellent heat resistance, the halved structure contributes to reduction of material costs. However, the half structure makes it easy to deform due to the influence of heat. In particular, when both ends of the bearing 3 apply more pressure than necessary to the heat generating roller 1, the rotation of the heat generating roller 1 is hindered as a result. The linear velocity may change, and the image may be disturbed or jammed.

本発明は、このような問題点を解決し、組立工数の短縮、自動化組立の簡略化を図るとともに、メンテナンスの作業性を向上させることを実現した定着装置を提供することをその課題とする。   It is an object of the present invention to provide a fixing device that solves such problems, reduces the number of assembly steps, simplifies automated assembly, and improves maintenance workability.

前記課題を解決達成するために、本発明は、駆動源から駆動力を得て回転する発熱ローラと、一部に欠落部を有する半リング状であって、前記発熱ローラの外周を包むように支持する軸受とを備え、前記発熱ローラが記録材を加熱することによって記録材に転写されたトナー画像を前記記録材上に定着させる定着装置において、前記軸受が前記発熱ローラの外周における180°以上の部分を支持し、前記軸受の欠落部の最短隙間は前記発熱ローラの直径よりも小さく、前記軸受における前記欠落部側の端部の少なくとも一方は、前記軸受に組み付けられた状態の前記発熱ローラと対向する面に段部または凹部を有し、この段部または凹部から前記発熱ローラの中心軸までの距離は前記発熱ローラの半径より長いことを特徴とする。 In order to achieve the above object, the present invention provides a heat generating roller that rotates by obtaining a driving force from a driving source, and a semi-ring shape having a missing portion in part, and supports the outer periphery of the heat generating roller. A fixing device that fixes the toner image transferred onto the recording material by heating the recording material by heating the recording material, wherein the bearing is 180 ° or more on the outer periphery of the heating roller. the portion supporting the shortest gap of the missing portion of the bearing is smaller than the diameter of the heating roller, at least hand end of the missing portion side of the bearing, the heating roller in the state assembled to the bearing And a distance from the step or recess to the central axis of the heat generating roller is longer than the radius of the heat generating roller.

また、前記軸受は、弾性変形により前記欠落部の最短隙間の長さを前記発熱ローラの外径と同じ長さまで広げることが可能であることを特徴とする。   Further, the bearing is characterized in that the length of the shortest gap of the missing portion can be extended to the same length as the outer diameter of the heat generating roller by elastic deformation.

また、前記軸受の欠落部の最短隙間部またはその近傍の角を削除し、円弧状の面あるいは平面状の面を形成したことを特徴とする。   Further, the shortest gap portion of the missing portion of the bearing or a corner in the vicinity thereof is deleted to form an arcuate surface or a planar surface.

本発明によれば、先に支持部材に軸受を組み付けてから軸受に発熱ローラを取り付けることができるので、従来のように発熱ローラに組み付いた軸受に対して支持部材を組み付けるという困難な作業がなくなるため、組み付け作業を容易にするとともに、メンテナンス時における作業性を向上させることができる。   According to the present invention, since the heat generating roller can be attached to the bearing after the bearing is first assembled to the support member, the difficult work of assembling the support member to the bearing assembled to the heat generating roller as in the prior art. As a result, assembly work can be facilitated and workability during maintenance can be improved.

以下、本発明の実施形態について、図面を参照しながら詳細に説明する。なお、図８または図９に示した従来の技術にかかる部材と同一の部材については、同一の符号を付しておき、それらの詳細な説明は敢えて省略した。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, about the member same as the member concerning the prior art shown in FIG. 8 or FIG. 9, the same code | symbol was attached | subjected and those detailed description was dared to omit.

まず、本発明の実施形態の説明に先立ち、参考例１，２を述べることにする。   Prior to the description of the embodiment of the present invention, reference examples 1 and 2 will be described.

図１は参考例１の要部の断面を示す平面図であり、図２は参考例１の要部の断面を示す側面図であり、６は軸受、７は支持部材を示す。この参考例１は、図８，図９に示した従来の技術における軸受３，支持部材４の代わりに、図１，図２に示す軸受６、支持部材７を設けたものである。   1 is a plan view showing a cross section of a main part of Reference Example 1, FIG. 2 is a side view showing a cross section of the main part of Reference Example 1, 6 is a bearing, and 7 is a support member. This reference example 1 is provided with a bearing 6 and a support member 7 shown in FIGS. 1 and 2 in place of the bearing 3 and the support member 4 in the prior art shown in FIGS.

軸受６は、円筒形のリング状部材を略半分に分割にした形状の半リング状部６aと、半リング状部６aの外周面の中央部より延出した止め部６bとにより構成されている。この止め部６bを含む仮想直線上には、軸受６を構成する半リング状部６aの中心が含まれる。また、この止め部６bの中央部には前記仮想直線に沿ってスリット６cが形成されており、このスリット６cによって止め部６bは２つの板状の弾性部に分割されている。さらに止め部６bの先端部はテーパ状に形成されており、このテーパの起点となる部分は鉤部６dとなっている。すなわち止め部６bは矢印型に形成されている。   The bearing 6 includes a semi-ring-shaped portion 6a having a shape obtained by dividing a cylindrical ring-shaped member into substantially halves, and a stop portion 6b extending from the central portion of the outer peripheral surface of the half-ring-shaped portion 6a. . The center of the half ring-shaped portion 6a constituting the bearing 6 is included on the virtual straight line including the stop portion 6b. A slit 6c is formed at the center of the stopper 6b along the virtual straight line, and the stopper 6b is divided into two plate-like elastic parts by the slit 6c. Further, the distal end portion of the stop portion 6b is formed in a tapered shape, and the portion that becomes the starting point of this taper is a flange portion 6d. That is, the stopper 6b is formed in an arrow shape.

また、支持部材７は、軸受６を位置決めかつ支持する位置に軸受６の外周形状に対応した半円形の凹部７aを有し、さらにこの凹部７aの中央部に貫通孔７bを備えている。そしてこの貫通孔７bに止め部６bを挿入し、支持部材７の外面に鉤部６dを引っかけることによって、支持部材７に軸受６が固定される。   Further, the support member 7 has a semicircular recess 7a corresponding to the outer peripheral shape of the bearing 6 at a position where the bearing 6 is positioned and supported, and further includes a through hole 7b at the center of the recess 7a. The bearing 6 is fixed to the support member 7 by inserting the stopper 6 b into the through hole 7 b and hooking the flange 6 d on the outer surface of the support member 7.

そして、装置を構成する際、加圧ローラ２，発熱ローラ１と組み付けたものに、予め軸受６を組み付けておいた支持部材７を組み付けることにより、軸受６によって発熱ローラ１が支持されるようになる。なお、このとき前記仮想直線は、加圧ローラ２の中心と発熱ローラ１の中心とを結ぶ仮想直線に略一致する。これにより、軸受６は支持部材７に止め部６bよって固定されているので外れることがなくなり、従来のように先に組み付いた軸受３(図８参照)に支持部材４(図８参照)を組み付けるという大変な作業をなくすことができる。   When the apparatus is constructed, the heat generating roller 1 is supported by the bearing 6 by assembling the supporting member 7 having the bearing 6 previously assembled to the pressure roller 2 and the heat generating roller 1. Become. At this time, the virtual straight line substantially coincides with a virtual straight line connecting the center of the pressure roller 2 and the center of the heat generating roller 1. As a result, the bearing 6 is fixed to the support member 7 by the stopper portion 6b, so that it does not come off, and the support member 4 (see FIG. 8) is attached to the bearing 3 (see FIG. 8) that has been assembled as before. The hard work of assembling can be eliminated.

図３は参考例２の要部の断面を示す平面図であり、８は軸受を示す。この参考例２は、図１，図２に示した参考例１における軸受６の代わりに、図３に示す軸受８を設けたものである。なお、図１または図２に示した参考例１にかかる部材と同一の部材については、同一の符号を付しておき、それらの詳細な説明は敢えて省略した。   FIG. 3 is a plan view showing a cross section of the main part of Reference Example 2, and 8 shows a bearing. In this reference example 2, a bearing 8 shown in FIG. 3 is provided instead of the bearing 6 in the reference example 1 shown in FIGS. In addition, about the member same as the member concerning the reference example 1 shown in FIG. 1 or FIG. 2, the same code | symbol was attached | subjected and those detailed description was abbreviate | omitted dare.

軸受８は、円筒形のリング状部材を中心から180°以上の部分を残したＣ字状の半リング状部８aと、半リング状部８aの外周面の中央部より延出した止め部８bとにより構成されている。さらに、常温(20℃〜25℃)の環境下において、半リング状部８aの欠落部８cの最短隙間Ｘが発熱ローラ１の直径Ｄよりも短く構成されている。なお、止め部８bの形状は参考例１における止め部６b(図１参照)の形状に等しいため説明は省略する。   The bearing 8 includes a C-shaped half ring-shaped portion 8a that leaves a portion of the cylindrical ring-shaped member 180 ° or more from the center, and a stop portion 8b that extends from the central portion of the outer peripheral surface of the half-ring shaped portion 8a. It is comprised by. Furthermore, the shortest gap X of the missing portion 8c of the half ring-shaped portion 8a is configured to be shorter than the diameter D of the heat generating roller 1 in an environment of normal temperature (20 ° C. to 25 ° C.). In addition, since the shape of the stop part 8b is equal to the shape of the stop part 6b (refer FIG. 1) in Reference Example 1, description is abbreviate | omitted.

このように軸受８を構成したことにより、軸受８によって発熱ローラ１が把持されるようになる。したがって、支持部材７に軸受８を取付け、さらに軸受８に発熱ローラ１を組み付けることにより、一体となったユニット体として支持部材７を加圧ローラ２側のユニット体に組み付けることができる。これにより、メンテナンス時において、支持されていない状態の発熱ローラ１に対して軸受３(図８参照)を組み付けるという困難な作業が解消できる。   By configuring the bearing 8 in this way, the heat generating roller 1 is gripped by the bearing 8. Therefore, by attaching the bearing 8 to the support member 7 and further attaching the heat generating roller 1 to the bearing 8, the support member 7 can be assembled to the unit body on the pressure roller 2 side as an integrated unit body. Thereby, the difficult operation | work which assembles | attaches the bearing 3 (refer FIG. 8) with respect to the heat_generation | fever roller 1 of the state which is not supported at the time of a maintenance can be eliminated.

図４は本発明の一実施形態の要部の断面を示す平面図であり、10は軸受を示す。本実施形態は、図１，図２に示した参考例１における軸受６の代わりに、図４に示す軸受10を設けたものである。なお、図１または図２に示した参考例１にかかる部材と同一の部材については、同一の符号を付しておき、それらの詳細な説明は敢えて省略した。   FIG. 4 is a plan view showing a cross section of the main part of one embodiment of the present invention, and 10 shows a bearing. In this embodiment, a bearing 10 shown in FIG. 4 is provided in place of the bearing 6 in Reference Example 1 shown in FIGS. In addition, about the member same as the member concerning the reference example 1 shown in FIG. 1 or FIG. 2, the same code | symbol was attached | subjected and those detailed description was abbreviate | omitted dare.

図５は本実施形態における軸受の構成を示す正面図、図６は図５のＡ部の拡大図である。軸受10は、円筒形のリング状部材を中心から180°以上の部分を残したＣ字状の半リング状部10aと、半リング状部10aの外周面の中央部より延出した止め部10bとにより構成されている。半リング状部10aは参考例２の半リング状部８aの内周面端部に段差10cを付け、さらに段差10cの端部に円弧状の曲面10eを形成し、いわゆる面取りを施した構成である。なお、止め部10bの形状は参考例１における止め部６b(図１参照)の形状に等しいため説明は省略する。また、段差10cの端部をテーパ状の面に形成しても良い。   FIG. 5 is a front view showing the configuration of the bearing in the present embodiment, and FIG. 6 is an enlarged view of a portion A in FIG. The bearing 10 includes a C-shaped semi-ring-shaped portion 10a that leaves a portion of the cylindrical ring-shaped member 180 ° or more from the center, and a stop portion 10b that extends from the center of the outer peripheral surface of the semi-ring-shaped portion 10a. It is comprised by. The semi-ring-shaped portion 10a has a configuration in which a step 10c is provided at the end of the inner peripheral surface of the semi-ring-shaped portion 8a of Reference Example 2, and an arcuate curved surface 10e is formed at the end of the step 10c so-called chamfering. is there. Since the shape of the stopper 10b is the same as the shape of the stopper 6b (see FIG. 1) in Reference Example 1, description thereof is omitted. Further, the end of the step 10c may be formed on a tapered surface.

この段差10cは、半リング状部10a内周面における、止め部10bが延出する方向に対して直角方向の半リング状部10aの直径を含む直線上に位置Ａ，Ｂ付近を境界としている。また、半リング状部10aの欠落部10dの最短隙間Ｘ´が、常温(20℃〜25℃)の環境下において、発熱ローラ１の直径Ｄよりも短く構成されている。   This step 10c has a boundary in the vicinity of positions A and B on a straight line including the diameter of the half ring-shaped portion 10a perpendicular to the direction in which the stopper portion 10b extends on the inner peripheral surface of the half ring-shaped portion 10a. . Further, the shortest gap X ′ of the missing portion 10d of the semi-ring-shaped portion 10a is configured to be shorter than the diameter D of the heat roller 1 in an environment of normal temperature (20 ° C. to 25 ° C.).

このように構成することにより、軸受10に発熱ローラ１を組み付けた時、段差10cが形成された領域において発熱ローラ１と軸受10の内周面との間に隙間Ｙが生ずるようになる。そのため、発熱ローラ１を加熱した際の熱影響で軸受10の両端が倒れてきたときに、隙間が小さくなるに留まり、軸受10が発熱ローラ１を把持することによる発熱ローラ１にかかる圧力が低減する。その結果、発熱ローラ１に対する回転負荷の増加による線速変化、画像乱れ、ジャム等を防ぐことができる。また、軸受10の端部に面取りを施したことにより、軸受10の角によって発熱ローラ１を傷めることなく、スムーズに軸受10を発熱ローラ１に組み付けることができる。   With this configuration, when the heat generating roller 1 is assembled to the bearing 10, a gap Y is generated between the heat generating roller 1 and the inner peripheral surface of the bearing 10 in the region where the step 10c is formed. For this reason, when both ends of the bearing 10 are tilted due to the heat effect when the heating roller 1 is heated, the gap remains small, and the pressure applied to the heating roller 1 by the bearing 10 gripping the heating roller 1 is reduced. To do. As a result, it is possible to prevent a change in linear velocity due to an increase in rotational load on the heat generating roller 1, image disturbance, jamming, and the like. Further, since the end portion of the bearing 10 is chamfered, the bearing 10 can be smoothly assembled to the heat generating roller 1 without damaging the heat generating roller 1 due to the corners of the bearing 10.

なお、本実施形態においては、軸受10の形状，材質，厚さ等の要因により、熱影響による軸受10の両端の倒れ具合が異なるため、隙間Ｙの大きさについては各種の条件に応じて適宜設定すると良い。また、軸受10に対して段差10cを形成する範囲についても、発熱ローラ１をガタのないように支持するという軸受10の本来の目的から逸脱しない程度に適宜設定することが可能である。また、本実施形態においては、軸受10の両端部に段差10cを形成したが、いずれか一方の端部にのみ段差10cを形成しても良く、さらに段差10cについても、図６に示すように、軸受10の内外周面に対して同心円上に形成する必要はなく、図７に示すように、凹状に形成して弾性を高めるような構造としても良い。すなわち、軸受10の端部における発熱ローラ１との対向面との任意位置から前記発熱ローラの中心軸までの距離が前記発熱ローラの半径よりも長くなるように、前記対向面に段差や凹部を設ければ良い。   In the present embodiment, the degree of tilting of the both ends of the bearing 10 due to the thermal effect varies depending on factors such as the shape, material, and thickness of the bearing 10, and therefore the size of the gap Y is appropriately determined according to various conditions. It is good to set. Further, the range in which the step 10c is formed with respect to the bearing 10 can also be set as appropriate so as not to deviate from the original purpose of the bearing 10 to support the heat generating roller 1 without play. In the present embodiment, the step 10c is formed at both ends of the bearing 10. However, the step 10c may be formed only at one of the ends, and the step 10c is also shown in FIG. In addition, it is not necessary to form concentric circles with respect to the inner and outer peripheral surfaces of the bearing 10, and as shown in FIG. That is, a step or a recess is formed on the facing surface so that a distance from an arbitrary position of the end portion of the bearing 10 to the surface facing the heat generating roller 1 to the central axis of the heat generating roller is longer than the radius of the heat generating roller. It only has to be provided.

さらに、本実施形態においては、発熱ローラ１を把持するために軸受の両端部に対してある程度の長さが必要となるが、発熱ローラ１における180°以上の外周を支持するため、軸受の端部をあまり長くすると横から軸受に発熱ローラを通すように組み付けなくてはならない場合がある。そのため、軸受の欠落部の最短隙間部をその弾性変形領域内で前記発熱ローラの外径と同じ長さまで広げることが可能なように、軸受の両端に弾性を持たせるか、あるいは軸受の両端の長さを設定することにより、さらに組立性を向上させることができる。   Further, in the present embodiment, a certain length is required with respect to both ends of the bearing in order to grip the heat generating roller 1, but in order to support the outer periphery of the heat generating roller 1 of 180 ° or more, the end of the bearing If the length is too long, it may be necessary to assemble the heat roller through the bearing from the side. For this reason, either end of the bearing is made elastic so that the shortest gap of the missing part of the bearing can be expanded within the elastic deformation region to the same length as the outer diameter of the heat generating roller. By setting the length, the assemblability can be further improved.

本発明は、複写装置，プリンタ装置，ファクシミリ装置等の電子写真装置に適用することにより、定着装置のメンテナンス時における作業性を向上させることができる。   By applying the present invention to an electrophotographic apparatus such as a copying apparatus, a printer apparatus, or a facsimile apparatus, the workability during maintenance of the fixing apparatus can be improved.

参考例１の要部の断面を示す平面図The top view which shows the cross section of the principal part of the reference example 1 参考例１の要部の断面を示す側面図Side view showing a cross section of the main part of Reference Example 1 参考例２の要部の断面を示す平面図The top view which shows the cross section of the principal part of the reference example 2 本発明の一実施形態の要部の断面を示す平面図The top view which shows the cross section of the principal part of one Embodiment of this invention 本実施形態における軸受の構成を示す正面図Front view showing the configuration of the bearing in the present embodiment 図５のＡ部の拡大図Enlarged view of part A in FIG. 本実施形態における軸受の他の構成を示す要部を拡大した正面図The front view which expanded the principal part which shows the other structure of the bearing in this embodiment. 従来の定着装置の要部の断面を示す正面図Front view showing a cross section of a main part of a conventional fixing device 図８の定着装置の側断面を示す側面図FIG. 8 is a side view showing a side cross section of the fixing device of FIG.

符号の説明Explanation of symbols

１ 発熱ローラ
２ 加圧ローラ
３，６，８，10 軸受
４，７ 支持部材
５ 駆動手段
６a，８a，10a 半リング状部
６b，８b，10b 止め部
６c スリット
６d 鉤部
７a 凹部
７b 貫通孔
８c，10d 欠落部
10c 段差
10e 曲面 DESCRIPTION OF SYMBOLS 1 Heat generating roller 2 Pressure roller 3, 6, 8, 10 Bearing 4, 7 Support member 5 Drive means 6a, 8a, 10a Half ring-shaped part 6b, 8b, 10b Stop part 6c Slit 6d collar part 7a Recessed part 7b Through-hole 8c , 10d missing part
10c Step
10e curved surface

Claims (3)

駆動源から駆動力を得て回転する発熱ローラと、一部に欠落部を有する半リング状であって、前記発熱ローラの外周を包むように支持する軸受とを備え、前記発熱ローラが記録材を加熱することによって記録材に転写されたトナー画像を前記記録材上に定着させる定着装置において、前記軸受が前記発熱ローラの外周における180°以上の部分を支持し、前記軸受の欠落部の最短隙間は前記発熱ローラの直径よりも小さく、前記軸受における前記欠落部側の端部の少なくとも一方は、前記軸受に組み付けられた状態の前記発熱ローラと対向する面に段部または凹部を有し、この段部または凹部から前記発熱ローラの中心軸までの距離は前記発熱ローラの半径より長いことを特徴とする定着装置。 A heating roller that rotates by obtaining a driving force from a driving source; and a bearing that is partially ring-shaped and has a missing portion, and that supports the outer periphery of the heating roller so as to wrap the outer periphery of the heating roller. In the fixing device for fixing the toner image transferred to the recording material by heating on the recording material, the bearing supports a portion of 180 ° or more on the outer periphery of the heating roller, and the shortest gap of the missing portion of the bearing is smaller than the diameter of the heating roller, at least hand end of the missing portion side of the bearing includes a stepped portion or recess in the heating roller and the opposing surfaces of the assembled state in the bearing, The fixing device characterized in that the distance from the stepped portion or the recessed portion to the central axis of the heat generating roller is longer than the radius of the heat generating roller. 前記軸受は、弾性変形により前記欠落部の最短隙間の長さを前記発熱ローラの外径と同じ長さまで広げることが可能であることを特徴とする請求項１記載の定着装置。   The fixing device according to claim 1, wherein the bearing is capable of expanding the length of the shortest gap of the missing portion to the same length as the outer diameter of the heat generating roller by elastic deformation. 前記軸受の欠落部の最短隙間部またはその近傍の角を削除し、円弧状の面あるいは平面状の面を形成したことを特徴とする請求項２記載の定着装置。   The fixing device according to claim 2, wherein an arcuate surface or a planar surface is formed by deleting a shortest gap portion of the missing portion of the bearing or a corner in the vicinity thereof.
JP2003372188A 2003-10-31 2003-10-31 Fixing device Expired - Fee Related JP3796607B2 (en)

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JP2003372188A JP3796607B2 (en) 2003-10-31 2003-10-31 Fixing device

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JP18028795A Division JP3514342B2 (en) 1995-07-17 1995-07-17 Fixing device

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JP3796607B2 true JP3796607B2 (en) 2006-07-12

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EP1907571B1 (en) 2005-06-15 2017-04-26 Complete Genomics Inc. Nucleic acid analysis by random mixtures of non-overlapping fragments
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