JP2006310017A - Heating device - Google Patents

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JP2006310017A
JP2006310017A JP2005129491A JP2005129491A JP2006310017A JP 2006310017 A JP2006310017 A JP 2006310017A JP 2005129491 A JP2005129491 A JP 2005129491A JP 2005129491 A JP2005129491 A JP 2005129491A JP 2006310017 A JP2006310017 A JP 2006310017A
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film
sliding member
fixing
height
heating
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Takehiko Suzuki
健彦 鈴木
Hideo Nanataki
秀夫 七瀧
Tetsuya Sano
哲也 佐野
Masashi Katagiri
真史 片桐
Kosuke Akamatsu
孝亮 赤松
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Canon Inc
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Canon Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems in a film heating type heating device (fixing device), because high pressurizing force is applied locally to a projecting part forming a second slide member, the frictional force between the projecting part and a film increases in the projecting part, stable sliding of the film cannot be made, and film slippage is produced. <P>SOLUTION: In this heating device, having a pressurizing member 19 for pressurizing a rotator and a supporting member for supporting the rotator while pressurizing and heating a material to be heated by conveying a material to be heated by holding it between contact parts formed by abutting of the rotator against the pressurizing member, a portion which has a first slide member sliding on the rotator on the inside of the rotator in the contact parts formed by abutting of the rotator against the pressurizing member and the second slide member located on the downstream side of the conveyance direction of the first slide member, and in which the height of the second contact member becomes higher as it is directed toward the downstream, from upstream in the conveyance direction in the contact parts is provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は例えば、複写機・レーザービームプリンタ等の画像形成装置において、被加熱材を、加圧・加熱する加熱装置、及び該加熱装置を被記録材に形成担持させた未定着像を加熱定着処理する像加熱装置として具備した電子写真装置・静電記録装置等の画像形成装置に関するものである。   The present invention, for example, in an image forming apparatus such as a copying machine or a laser beam printer, heats and fixes a heating device that pressurizes and heats a heated material, and an unfixed image formed and supported on the recording material. The present invention relates to an image forming apparatus such as an electrophotographic apparatus or an electrostatic recording apparatus provided as an image heating apparatus to be processed.

一般に、複写機、プリンタ等においては、電子写真方式の画像形成装置が広く採用されている。電子写真方式では、静電的な力を利用し、トナー粒子による画像を記録用紙等の記録材上に転写し、像加熱装置としての定着装置でそのトナー像を記録材上に溶融固着させて安定した画像を形成する。   In general, electrophotographic image forming apparatuses are widely used in copying machines, printers, and the like. In the electrophotographic system, an electrostatic force is used to transfer an image of toner particles onto a recording material such as recording paper, and the toner image is melted and fixed on the recording material by a fixing device as an image heating device. A stable image is formed.

定着装置としては、熱ローラ方式が広く用いられている。また、近時はフィルム加熱方式の装置が実用化されている。   As the fixing device, a heat roller method is widely used. Recently, a film heating system has been put into practical use.

熱ローラ方式としては、定着ローラ（加熱ローラ）と加圧ローラとの圧接ローラ対を基本構成とし、該ローラ対を回転させ、該ローラ対の相互圧接部である定着ニップ部（加熱ニップ部）に画像定着すべき未定着トナー画像を形成担持させた被記録材を導入して挟持搬送させて、定着ローラの熱と、定着ニップ部の加圧力にて未定着トナー画像を被記録材面に熱圧定着させるものである。   As the heat roller system, a pressure roller pair of a fixing roller (heating roller) and a pressure roller is a basic configuration, and the roller pair is rotated, and a fixing nip portion (heating nip portion) which is a mutual pressure contact portion of the roller pair A recording material on which an unfixed toner image to be image-fixed is formed and supported is introduced and nipped and conveyed, and the unfixed toner image is applied to the surface of the recording material by the heat of the fixing roller and the pressure of the fixing nip. It is to fix by heat and pressure.

この熱ローラ方式の定着装置に用いられる定着ローラ及び加圧ローラとしては、たとえばアルミ等の中空ローラの表面に、当接ニップ確保のためシリコンゴム、フッ素ゴム等の耐熱性弾性層を、トナーや紙粉等が固着するのを防ぐため最表層にＰＦＡ（テトラフルオロエチレン−パーフルオロアルキルビニルエーテル共重合体）、ＰＴＦＥ（ポリテトラフルオロエチレン）等の樹脂によるコーティング層等の離型層を被覆したものが知られ、定着ローラを内部からハロゲンヒータ等により加熱し、表面温度を所定の定着温度に保ち、加熱定着を行うのが一般的である。   As a fixing roller and a pressure roller used in this heat roller type fixing device, for example, a heat-resistant elastic layer such as silicon rubber or fluorine rubber is provided on the surface of a hollow roller such as aluminum to secure a contact nip. The outermost layer is coated with a release layer such as a coating layer of a resin such as PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer) or PTFE (polytetrafluoroethylene) in order to prevent sticking of paper dust etc. In general, the fixing roller is heated from the inside by a halogen heater or the like to maintain the surface temperature at a predetermined fixing temperature and perform heat fixing.

フィルム加熱方式の定着装置は、例えば特開昭６３−３１３１８２号公報・特開平２−１５７８７８号公報・特開平４−４４０７５号公報・特開平４−２０４９８０号公報等に提案されている。   A film heating type fixing device has been proposed in, for example, Japanese Patent Laid-Open Nos. 63-313182, 2-157878, 4-44075, 4-204980, and the like.

すなわち、加熱体としての一般にセラミックヒータと、加圧部材としての加圧ローラとの間に耐熱性フィルム（定着フィルム）を挟ませてニップ部を形成させ、該ニップ部のフィルムと加圧ローラとの間に画像定着すべき未定着トナー画像を形成担持させた被記録材を導入してフィルムといっしょに挟持搬送させることで、ニップ部において加熱・加圧して未定着トナー画像を被記録材面に熱圧定着させるものである。   That is, a nip portion is formed by sandwiching a heat-resistant film (fixing film) between a ceramic heater as a heating element and a pressure roller as a pressure member, and the film in the nip portion and the pressure roller A recording material on which an unfixed toner image to be image-fixed is formed and supported is introduced and conveyed together with the film so that the unfixed toner image is heated and pressurized in the nip portion. It is fixed to heat and pressure.

このフィルム加熱方式の定着装置は、セラミックヒータ及びフィルムとして低熱容量の部材を用いてオンデマンドタイプの装置を構成することができ、画像形成装置の画像形成実行時のみ熱源としてのセラミックヒータに通電して所定の定着温度に発熱させた状態にすればよく、画像形成装置の電源オンから画像形成実行可能状態までの待ち時間が短く（クイックスタート性）、スタンバイ時の消費電力も大幅に小さい（省電力）等の利点がある。   This film heating type fixing device can be configured as an on-demand type device using a ceramic heater and a film having a low heat capacity as a film, and energizes the ceramic heater as a heat source only when the image forming apparatus performs image formation. It is only necessary to generate heat at a predetermined fixing temperature, and the waiting time from the power-on of the image forming apparatus to the image forming executable state is short (quick start property), and the power consumption during standby is greatly reduced (saving) Power).

フィルム方式の加熱装置において、回転体としての円筒状もしくはエンドレスベルト状のフィルムの駆動方法としては、フィルム内周面を案内するフィルムガイドと加圧ローラとで圧接されたフィルムを加圧ローラの回転駆動によって従動回転させる方式（加圧ローラ駆動方式）や、逆に駆動ローラとテンションローラによって張架されたエンドレスベルト状のフィルムの駆動によって加圧ローラを従動回転させるもの等がある。   In a film-type heating device, a cylindrical or endless belt-shaped film as a rotating body is driven by rotating a pressure roller with a film pressure-contacted by a film guide for guiding the inner peripheral surface of the film and a pressure roller. There are a system in which the driven roller is rotated by driving (pressure roller driving system), and a system in which the pressure roller is driven to rotate by driving an endless belt-like film stretched between the driving roller and the tension roller.

一方、特開平１０−１９８２００号公報には、回転体と加圧部材との当接によって形成される接触部（ニップ部）に相当する部分の回転体を支持する支持部材に、突起部を設け、ニップ内で局所的に加圧力が高くなるように構成して、ＯＨＴの透過性、高グロス媒体の光沢性、及び厚紙の定着性等の向上を図ったものが提案されている。
特開平１０−１９８２００号公報 On the other hand, in Japanese Patent Laid-Open No. 10-198200, a protrusion is provided on a support member that supports a portion of a rotating body corresponding to a contact portion (nip portion) formed by contact between the rotating body and a pressure member. A structure is proposed in which the applied pressure is locally increased in the nip to improve the OHT permeability, the gloss of the high gloss medium, the cardboard fixability, and the like.
JP-A-10-198200

しかしながら、上述したフィルム加熱方式の加熱装置（定着装置）においては、第二の摺動部材である突起部に局所的に高加圧力を印加されるため、突起部ではフィルムとの摩擦力が増大し、安定したフィルムの摺動ができなくなり、フィルムがスリップするという現象が発生することがあった。   However, in the above-described film heating type heating device (fixing device), since a high pressure is locally applied to the protruding portion which is the second sliding member, the frictional force with the film increases at the protruding portion. However, there is a case in which a stable film sliding cannot be performed and the film slips.

図７を用いて詳しく説明する。図７は、従来の突起形状を用いた加熱装置のニップ部を拡大した横断面模型図である。従来の突起部２９（第二の摺動部材）は、高さが均一で第一の摺動部材１７よりも高い。このため、第一の摺動部材１７と第二の摺動部材である突起部２９の段差部分である突起部上流端部（図中P部）では特に高圧力がかかり、この部分でグリス（潤滑剤）を掻き取ってしまうため突起部２９下流部にグリス供給ができなくなってしまう。このため、突起部２９と定着フィルム１６との摩擦力が高くなり安定したフィルムの摺動ができなくなっていた。ここで、１９は加圧部材である。   This will be described in detail with reference to FIG. FIG. 7 is an enlarged cross-sectional model view of a nip portion of a heating device using a conventional protrusion shape. The conventional protrusion 29 (second sliding member) has a uniform height and is higher than the first sliding member 17. For this reason, particularly high pressure is applied to the upstream end portion (P portion in the figure) that is the step portion of the first sliding member 17 and the protruding portion 29 that is the second sliding member, and grease ( Since the lubricant is scraped off, the grease cannot be supplied to the downstream portion of the projection 29. For this reason, the frictional force between the projecting portion 29 and the fixing film 16 is increased, and stable film sliding cannot be performed. Here, 19 is a pressure member.

本発明は、フィルムスリップの防止を目的とする。   The present invention aims to prevent film slip.

上述の課題を解決するための本発明は、回転体と、回転体を加圧する加圧部材、及び回転体を支持する支持部材とを有し、回転体と加圧部材との当接によって形成される接触部で被加熱材を挟持搬送して被加熱材を加圧及び加熱する加熱装置において、前記回転体と加圧部材との当接によって形成される接触部の回転体の内側に回転体と摺動する第一の摺動部材と第一の摺動部材の搬送方向下流に位置する第二の摺動部材を有し、前記接触部内で第二の接触部材の高さが搬送方向上流から下流に向かって高くなる部分を設けることを特徴とする。   The present invention for solving the above-described problems includes a rotating body, a pressure member that pressurizes the rotating body, and a support member that supports the rotating body, and is formed by contact between the rotating body and the pressure member. In the heating device that pressurizes and heats the heated material by nipping and conveying the heated material at the contact portion that is rotated, the contact portion formed by contact between the rotating body and the pressure member is rotated inside the rotating body. A first sliding member that slides on the body and a second sliding member that is located downstream in the conveying direction of the first sliding member, and the height of the second contact member is within the conveying direction within the contact portion It is characterized by providing a portion that rises from upstream to downstream.

本発明によれば、第二の摺動部材（突起部）にかかる圧力を分散することができ、局所的に高圧力がかかるのを防止できる。これにより、第二の摺動部材上に安定してグリスを供給することができる。また、第二の摺動部材上にグリス溜まりを設けることができるためより安定したグリス供給が可能となる。これにより、フィルムと第二の摺動部材とを安定して摺動させることができ、フィルムのスリップが防止できる。   According to the present invention, it is possible to disperse the pressure applied to the second sliding member (protrusion), and to prevent high pressure from being applied locally. Thereby, grease can be stably supplied onto the second sliding member. Moreover, since the grease reservoir can be provided on the second sliding member, more stable supply of grease is possible. Thereby, a film and a 2nd sliding member can be slid stably and the slip of a film can be prevented.

（実施例１）
本実施例は、加熱体としてセラミックヒータを用いたフィルム加熱方式の定着装置例である。 Example 1
This embodiment is an example of a film heating type fixing device using a ceramic heater as a heating element.

図１は該装置の中間部分省略の正面模型図、図２は中間部分省略の縦断面模型図、図３は横断面模型図、図４はニップ部Ｎを拡大した横断面模型図である。   FIG. 1 is a front model view of the apparatus with the intermediate portion omitted, FIG. 2 is a vertical cross-sectional model view of the intermediate portion omitted, FIG. 3 is a cross-sectional model view, and FIG.

１８は支持部材としての横断面略半円弧状桶型の耐熱性・断熱性のフィルムガイド、１７は第一の摺動部材であり、加熱体としてのセラミックヒータである。３０は第二の摺動部材であり、局所的に高加圧力を印加するための突起部材である。セラミックヒータ１７及び突起部材３０は、それぞれフィルムガイド１８の下面の略中央部にガイド長手に沿って形成具備させた溝部に嵌入して固定支持させてある。   Reference numeral 18 denotes a heat-resistant and heat-insulating film guide having a substantially semicircular arc shape in cross section as a supporting member, and 17 denotes a first sliding member, which is a ceramic heater as a heating body. Reference numeral 30 denotes a second sliding member, which is a protruding member for locally applying a high pressing force. The ceramic heater 17 and the protruding member 30 are fitted and fixedly supported in a groove formed along the longitudinal direction of the guide at the substantially central portion of the lower surface of the film guide 18.

１６は円筒状もしくはエンドレス状の耐熱性の定着フィルムである。該定着フィルム１６はフィルムガイド１８にルーズに外嵌させてある。   Reference numeral 16 denotes a cylindrical or endless heat-resistant fixing film. The fixing film 16 is loosely fitted on the film guide 18.

２５はフィルムガイド１８の端部側に嵌着させた、フィルム寄り移動規制手段としての環状フランジ部材である。２０はフィルムガイド１８の内側に挿通した加圧用剛性ステイである。上記のフィルムガイド１８、セラミックヒータ１７、突起部材３０、定着フィルム１６、環状フランジ部材２５、加圧用剛性ステイ２０の組み立て体が第１部材であり、これを便宜上「加熱アセンブリ」と称す。１９は第２部材としての加圧部材である。本例は弾性加圧ローラであり、芯金１９ａにシリコーンゴム等の弾性層１９ｂを設けて硬度を下げたもので、芯金１９ａの両端部を装置の不図示の手前側と奥側のシャーシー側板間に回転自由に軸受け保持させて配設してある。表面性を向上させるために、さらに外周に、ＰＴＦＥ、ＰＦＡ、ＦＥＰ等のフッ素樹脂層を設けても良い。   Reference numeral 25 denotes an annular flange member that is fitted to the end side of the film guide 18 and serves as a film-side movement restricting means. Reference numeral 20 denotes a pressurizing rigid stay inserted inside the film guide 18. The assembly of the film guide 18, the ceramic heater 17, the protruding member 30, the fixing film 16, the annular flange member 25, and the pressurizing rigid stay 20 is a first member, which is referred to as a “heating assembly” for convenience. Reference numeral 19 denotes a pressure member as a second member. In this example, an elastic pressure roller is provided, in which an elastic layer 19b such as silicone rubber is provided on the core metal 19a to lower the hardness. A bearing is rotatably held between the side plates. In order to improve surface properties, a fluororesin layer such as PTFE, PFA, FEP or the like may be further provided on the outer periphery.

この加圧ローラ１９の上側に、上記の加熱アセンブリをフィルムガイド１８の下面側を下向きにして配設し、ステイ２０の両端部と装置シャーシー側板側のばね受け部材２１・２１との間にそれぞれ加圧ばね２２・２２を縮設することでステイ２０に押し下げ力を作用させている。これによりフィルムガイド１８が加圧されてフィルムガイド１８の下面、及び、フィルムガイド１８下面に配設したセラミックヒータ１７、突起部材３０の下面と加圧ローラ１９とが定着フィルム１６を挟んで圧接して定着ニップ部Ｎが形成される。   Above the pressure roller 19, the above heating assembly is disposed with the lower surface side of the film guide 18 facing downward, and between the both ends of the stay 20 and the spring receiving members 21 and 21 on the apparatus chassis side plate side, respectively. A pressing force is applied to the stay 20 by contracting the pressure springs 22. As a result, the film guide 18 is pressurized and the lower surface of the film guide 18, the ceramic heater 17 disposed on the lower surface of the film guide 18, the lower surface of the protruding member 30 and the pressure roller 19 are in pressure contact with the fixing film 16 interposed therebetween. Thus, the fixing nip portion N is formed.

加圧ローラ１９は不図示の駆動手段により矢示の反時計方向に回転駆動される。この加圧ローラ１９の回転駆動による該加圧ローラ１９と定着フィルム１６の外面との摩擦力で定着フィルム１６に回転力が作用する。その結果、該定着フィルム１６が内面を定着ニップ部Ｎにおいてセラミックヒータ１７の下面に密着して摺動しながら矢示の時計方向にフィルムガイド１８の外回りを回転する（加圧ローラ駆動方式）。なお、定着フィルム１６は、加圧ローラ１９の回転周速度にほぼ対応した周速度をもった回転状態となる。   The pressure roller 19 is rotationally driven in a counterclockwise direction indicated by an arrow by a driving unit (not shown). A rotational force acts on the fixing film 16 by the frictional force between the pressure roller 19 and the outer surface of the fixing film 16 by the rotational driving of the pressure roller 19. As a result, the fixing film 16 rotates around the film guide 18 in the clockwise direction indicated by an arrow while sliding in close contact with the lower surface of the ceramic heater 17 in the fixing nip portion N (pressure roller driving system). The fixing film 16 is in a rotating state having a peripheral speed substantially corresponding to the rotational peripheral speed of the pressure roller 19.

定着ニップ部Ｎにおけるセラミックヒータ１７及び突起部材３０の下面と定着フィルム１６の内面との相互摺動摩擦力を低減化させるために定着ニップ部Ｎのセラミックヒータ１７の下面と定着フィルム１６の内面との間に耐熱性グリスなどの潤滑剤を介在させる。   In order to reduce the mutual sliding frictional force between the lower surface of the ceramic heater 17 and the protrusion member 30 and the inner surface of the fixing film 16 in the fixing nip portion N, the lower surface of the ceramic heater 17 and the inner surface of the fixing film 16 in the fixing nip portion N A lubricant such as heat resistant grease is interposed between them.

プリントスタート信号に基づいて加圧ローラ１９の回転が開始され、またセラミックヒータ１７のヒートアップが開始される。加圧ローラ１９の回転による定着フィルム１６の回転周速度が定常化し、セラミックヒータ１７の温度が所定の温度に立ち上がった状態において、定着ニップ部Ｎの定着フィルム１６と加圧ローラ１９との間に被加熱材としてのトナーｔを担持させた被記録材Ｐがトナー画像担持面側を定着フィルム１６側にして導入されることで、被記録材Ｐは定着ニップ部Ｎにおいて定着フィルム１６を介してセラミックヒータ１７の下面に密着して定着ニップ部Ｎを定着フィルム１６といっしょに移動通過していく。その移動通過過程においてセラミックヒータ１７の熱が定着フィルム１６を介して被記録材Ｐに付与されてトナー画像ｔが被記録材Ｐ面に加熱定着される。定着ニップ部Ｎを通過した被記録材Ｐは定着フィルム１６の面から分離されて搬送される。   Based on the print start signal, the rotation of the pressure roller 19 is started, and the ceramic heater 17 starts to heat up. In the state where the rotation peripheral speed of the fixing film 16 is stabilized by the rotation of the pressure roller 19 and the temperature of the ceramic heater 17 rises to a predetermined temperature, between the fixing film 16 and the pressure roller 19 in the fixing nip portion N. The recording material P carrying the toner t as the heated material is introduced with the toner image carrying surface side of the fixing film 16 side, so that the recording material P passes through the fixing film 16 in the fixing nip portion N. In close contact with the lower surface of the ceramic heater 17, the fixing nip N moves and passes along with the fixing film 16. During the moving and passing process, the heat of the ceramic heater 17 is applied to the recording material P through the fixing film 16 and the toner image t is heated and fixed on the surface of the recording material P. The recording material P that has passed through the fixing nip N is separated from the surface of the fixing film 16 and conveyed.

定着フィルム１６は、厚さ２０〜１００μｍの耐熱性のＰＴＦＥ、ＰＦＡ、ＦＥＰの単層、あるいは厚さ２０〜１００μｍのポリイミド、ポリイミドアミド、ＰＥＥＫ、ＰＥＳ、ＰＰＳ等の外周面に、ＰＴＦＥ、ＰＦＡ、ＦＥＰ等を１０〜３０μｍコーティングした複合層フィルムを使用できる。なお、中間層として、厚さ５０〜３００μｍのシリコンゴム、フッ素ゴム等の耐熱性弾性層を設けても良い。本例では、ポリイミドフィルムの外周面にシリコンゴム層を設け、その外面にＰＴＦＥをコーティングした直径２０ｍｍのものを用いた。   The fixing film 16 has a single layer of heat-resistant PTFE, PFA, FEP having a thickness of 20 to 100 μm, or an outer peripheral surface of polyimide, polyimide amide, PEEK, PES, PPS, etc. having a thickness of 20 to 100 μm. A composite layer film coated with 10-30 μm of FEP or the like can be used. Note that a heat-resistant elastic layer such as silicon rubber or fluororubber having a thickness of 50 to 300 μm may be provided as the intermediate layer. In this example, a polyimide film having a diameter of 20 mm in which a silicon rubber layer was provided on the outer peripheral surface of the polyimide film and PTFE was coated on the outer surface thereof was used.

第一の摺動部材であるセラミックヒータ１７は、定着フィルム１６・被記録材Ｐの移動方向に直行する方向を長手とする低熱容量の横長の線状加熱体である。該セラミックヒータ１７は、アルミナ等でできたヒータ基板１７ａと、このヒータ基板１７ａの表面にその長手に沿って設けた発熱層１７ｂ、例えばＡｇ／Ｐｄ（銀／パラジウム）等の電気抵抗材料を約１０μｍ、幅１〜５ｍｍにスクリーン印刷等により塗工して設けた発熱層１７ｂと、さらにその上に設けたガラスやフッ素樹脂等の保護層１７ｃを基本構成とするものである。   The ceramic heater 17 as a first sliding member is a horizontally long linear heating body with a low heat capacity and having a longitudinal direction as a direction perpendicular to the moving direction of the fixing film 16 and the recording material P. The ceramic heater 17 includes a heater substrate 17a made of alumina or the like, and a heating layer 17b provided on the surface of the heater substrate 17a along the length thereof, for example, an electric resistance material such as Ag / Pd (silver / palladium). A heat generation layer 17b provided by coating by screen printing or the like with a thickness of 10 μm and a width of 1 to 5 mm, and a protective layer 17c such as glass or fluororesin provided thereon are the basic components.

該セラミックヒータ１７の発熱層１７ｂの両端間に通電されることで発熱層１７ｂは発熱してヒータ１７が急速に昇温する。そのヒータ温度が不図示の温度センサに検知され、ヒータ温度が所定の温度に維持されるように不図示の制御回路で発熱層１７ｂに対する通電が制御されてヒータ１７は温度管理される。   By energizing both ends of the heat generating layer 17b of the ceramic heater 17, the heat generating layer 17b generates heat, and the heater 17 rapidly rises in temperature. The heater temperature is detected by a temperature sensor (not shown), and energization of the heat generating layer 17b is controlled by a control circuit (not shown) so that the heater temperature is maintained at a predetermined temperature, and the heater 17 is temperature-controlled.

該セラミックヒータ１７は、フィルムガイド１８の下面の略中央部にガイド長手に沿って形成具備させた溝部に保護層１７ｃ側を下向きに露呈させて嵌入して固定支持させてある。したがって定着ニップ部Ｎにおいてこのセラミックヒータ１７の保護層１７ｃの面と定着フィルム１６の内面が相互接触摺動する。   The ceramic heater 17 is fixedly supported by being fitted in a groove formed along the longitudinal direction of the guide at the substantially central portion of the lower surface of the film guide 18 with the protective layer 17c side exposed downward. Accordingly, in the fixing nip portion N, the surface of the protective layer 17c of the ceramic heater 17 and the inner surface of the fixing film 16 slide in contact with each other.

フィルムガイド１８は、フェノール樹脂、ポリイミド樹脂、ポリアミド樹脂、ポリアミドイミド樹脂、ＰＥＥＫ樹脂、ＰＥＳ樹脂、ＰＰＳ樹脂、ＰＦＡ樹脂、ＰＴＦＥ樹脂、ＬＣＰ樹脂等の絶縁性及び耐熱性の良い材料が用いられ、圧接部（ニップ部Ｎ）へ加圧、ヒータ及び突起部材の支持、フィルムの回転時の搬送安定性を図る役目をする。   The film guide 18 is made of a material having good insulation and heat resistance such as phenol resin, polyimide resin, polyamide resin, polyamideimide resin, PEEK resin, PES resin, PPS resin, PFA resin, PTFE resin, LCP resin, and the like. It functions to pressurize the part (nip part N), support the heater and the protruding member, and to improve the conveyance stability during rotation of the film.

第二の摺動部材である突起部材３０は、フェノール樹脂、ポリイミド樹脂、ポリアミドイミド樹脂、ＰＥＥＫ樹脂、ＰＥＳ樹脂、ＰＰＳ樹脂、フッ素樹脂（ＰＦＡ、ＰＴＦＥ、ＦＥＰ、ｅｔｃ．）、ＬＣＰ（ｌｉｑｕｉｄ ｃｒｙｓｔａｌ ｐｏｌｙｍｅｒ：液晶ポリマー）樹脂、これらの混合樹脂等の耐熱性の良い材料からなる。   The projecting member 30 which is the second sliding member is made of phenol resin, polyimide resin, polyamideimide resin, PEEK resin, PES resin, PPS resin, fluororesin (PFA, PTFE, FEP, etc.), LCP (liquid crystal polymer). : Liquid crystal polymer) made of a heat-resistant material such as a resin or a mixed resin thereof.

ここで、本実施例では、第二の摺動部材である突起部３０に搬送方向上流から下流に向かって高さが高くなるような傾斜部分を設けた。また、突起部３０の幅は１ｍｍ、突起部の高さとしてはヒータ下面（保護層１７ｃ面）より０．０５ｍｍ〜１ｍｍ多く露呈するように高さを規定し、ヒータ１７に併設して支持部材であるフィルムガイド１８に設けられた溝部分に嵌入して固定支持してある。   Here, in the present embodiment, the protruding portion 30 as the second sliding member is provided with an inclined portion whose height increases from the upstream side toward the downstream side in the transport direction. Further, the width of the protruding portion 30 is 1 mm, and the height of the protruding portion is defined to be 0.05 mm to 1 mm more than the lower surface of the heater (the surface of the protective layer 17 c). The film guide 18 is inserted into a groove portion and fixedly supported.

これにより、突起部の搬送方向上流側端部に局所的な高圧力がかかるのを防止でき、その部分でグリスを掻き取ってしまうことがなくなった。このため、突起部へのグリスの供給を安定して行うことができ、スリップを防止することができた。また、突起部の本来の目的である高圧力部分は突起部の下流側で実現できるため、ＯＨＴの透過性、高グロス媒体の光沢性、及び厚紙の定着性等の向上についても実現できた。   As a result, it is possible to prevent a local high pressure from being applied to the upstream end portion in the transport direction of the protrusion, and the grease is not scraped off at that portion. For this reason, it was possible to stably supply the grease to the protrusions and prevent slipping. Further, since the high pressure portion, which is the original purpose of the protruding portion, can be realized on the downstream side of the protruding portion, improvement in OHT permeability, glossiness of a high gloss medium, fixing property of cardboard, and the like can be realized.

本実施例では、突起部の傾斜を突起部の上流側端部から設けたが、特にその位置に限ったものではない。例えば、上流側端部より０．５ｍｍ下流の位置から傾斜を設けても良い。   In this embodiment, the inclination of the protrusion is provided from the upstream end of the protrusion, but the position is not limited to that. For example, the inclination may be provided from a position 0.5 mm downstream from the upstream end.

（実施例２）
以下に本発明に係わる加熱装置を詳しく説明する。次に説明する実施例２では、加熱装置は図１〜３に示す加熱装置に具現化するものとする。従って、加熱装置の全体的構成、機能についての詳しい説明は省略し、本発明の特徴部分ついてのみ説明する。 (Example 2)
The heating apparatus according to the present invention will be described in detail below. In Example 2 described below, the heating device is embodied in the heating device shown in FIGS. Therefore, a detailed description of the overall configuration and function of the heating device will be omitted, and only the features of the present invention will be described.

本実施例では、図５に示すように第二の摺動部材である突起部３１の搬送方向上流側端部の高さH2と、第一の摺動部材であるセラミックヒータ１７の高さH1との関係が、H2＜H1になるように設定した。また、突起部３１の幅は１ｍｍ、突起部の高さとしてはヒータ下面（保護層１７ｃ面）より０．０５ｍｍ〜１ｍｍ多く露呈するように高さを規定し、ヒータ１７に併設して支持部材であるフィルムガイド１８に設けられた溝部分に嵌入して固定支持した。   In this embodiment, as shown in FIG. 5, the height H2 of the upstream end in the transport direction of the protrusion 31 as the second sliding member and the height H1 of the ceramic heater 17 as the first sliding member. Was set so that H2 <H1. Further, the width of the protrusion 31 is 1 mm, and the height of the protrusion is defined to be 0.05 mm to 1 mm more than the heater lower surface (protective layer 17 c surface). It was inserted into a groove portion provided in the film guide 18 and fixedly supported.

これにより、突起部３１の上流部（図中G部）に空間を確保することができ、この突起上流部に常にグリスを溜めておくことができる。このグリス溜まり部を設けることにより、グリス量が多い場合は不要なグリスを溜めておくことができ、耐久後半のグリスが減少して時には、この部分に溜めたグリスが徐々に供給されるため、長期間に渡り、最も高圧力がかかる突起部３１の下流部に常に安定したグリスを供給することができる。   As a result, a space can be secured in the upstream portion (G portion in the figure) of the protruding portion 31, and grease can always be stored in the protruding upstream portion. By providing this grease reservoir, unnecessary grease can be stored when the amount of grease is large, and when the grease in the second half of the endurance decreases, the grease stored in this part is gradually supplied, For a long period of time, it is possible to always supply stable grease to the downstream portion of the protrusion 31 to which the highest pressure is applied.

（実施例３）
以下に本発明に係わる加熱装置を詳しく説明する。次に説明する実施例３では、加熱装置は図１〜３に示す加熱装置に具現化するものとする。従って、加熱装置の全体的構成、機能についての詳しい説明は省略し、本発明の特徴部分ついてのみ説明する。 (Example 3)
The heating apparatus according to the present invention will be described in detail below. In Example 3 described below, the heating device is embodied in the heating device shown in FIGS. Therefore, a detailed description of the overall configuration and function of the heating device will be omitted, and only the features of the present invention will be described.

実施例１及び２では、第一の摺動部材とされるセラミックヒータの高さは均一であり、端面まで最表面はガラスやフッ素樹脂等の保護層１７ｃであった。しかしながら、端面まで保護層１７ｃを設けるのは技術的に困難であり、コストも上がってしまう。そのため、一般的には、保護層１７ｃはセラミックヒータ１７の中央部に設け、端部はアルミナ等でできたヒータ基板１７ａが最表層にくる場合が多い。このような場合では、実施例２のようにグリス溜まりを設ける時に、第二の摺動部材とされる突起部の上流側端部の高さが、ヒータ基板１７ａの高さよりも低くなってしまうと、定着フィルム１６がヒータ基板１７ａに接触してしまう場合がある。定着フィルム１６がヒータ基板１７ａに接触してしまうと、定着フィルム１６が削れてしまい、それにより画像不良や摩擦力の増大によるスリップを引き起こしてしまう。   In Examples 1 and 2, the height of the ceramic heater used as the first sliding member was uniform, and the outermost surface up to the end surface was a protective layer 17c such as glass or fluororesin. However, it is technically difficult to provide the protective layer 17c up to the end face, and the cost increases. Therefore, in general, the protective layer 17c is provided at the center of the ceramic heater 17 and the heater substrate 17a made of alumina or the like at the end is often the outermost layer. In such a case, when the grease reservoir is provided as in the second embodiment, the height of the upstream end portion of the protruding portion that is the second sliding member is lower than the height of the heater substrate 17a. The fixing film 16 may come into contact with the heater substrate 17a. If the fixing film 16 comes into contact with the heater substrate 17a, the fixing film 16 is scraped, thereby causing slippage due to an image defect or an increase in frictional force.

そこで、本実施例では、図６（１）及び（２）に示すように、第二の摺動部材である突起部３２の搬送方向上流側端部の高さH2と、前記第一の摺動部材１７の搬送方向下流側端部高さH11と、前記第一の摺動部材の中央部高さH12との関係が、H11＜H2＜H12となるように設定した。また、突起部３２の幅は１ｍｍ、突起部の高さとしてはヒータ下面（保護層１７ｃ面）より０．０５ｍｍ〜１ｍｍ多く露呈するように高さを規定し、ヒータ１７に併設して支持部材であるフィルムガイド１８に設けられた溝部分に嵌入して固定支持した。   Therefore, in this embodiment, as shown in FIGS. 6 (1) and (2), the height H2 of the upstream end in the transport direction of the protrusion 32, which is the second sliding member, The relationship between the downstream end height H11 of the moving member 17 in the conveying direction and the central height H12 of the first sliding member was set to satisfy H11 <H2 <H12. Further, the width of the protruding portion 32 is 1 mm, and the height of the protruding portion is defined to be 0.05 mm to 1 mm more than the lower surface of the heater (the surface of the protective layer 17 c). It was inserted into a groove portion provided in the film guide 18 and fixedly supported.

これにより、定着フィルム１６がヒータ基板１７ａに接触してしまうことがなくなり、定着フィルム１６の削れが防止できた上に、突起部３２の上流部に空間を確保することもでき、このグリス溜まりにより突起部３２の下流への安定したグリス供給が可能となった。   As a result, the fixing film 16 does not come into contact with the heater substrate 17a, and the fixing film 16 can be prevented from being scraped, and a space can be secured in the upstream portion of the protruding portion 32. A stable supply of grease to the downstream of the protrusion 32 was made possible.

第１の実施例の定着装置の中間部分省略の正面模型図。FIG. 3 is a front model view of an intermediate portion omitted in the fixing device of the first embodiment. 同装置の中間部分省略の縦断面模型図。The longitudinal cross-sectional model figure of the intermediate part omission of the apparatus. 同装置の横断面図。The cross-sectional view of the same apparatus. 本発明に係わる実施例１のニップ部Ｎを拡大した横断面模型図。The cross-sectional model figure which expanded the nip part N of Example 1 concerning this invention. 本発明に係わる実施例２のニップ部Ｎを拡大した横断面模型図。The cross-sectional model figure which expanded the nip part N of Example 2 concerning this invention. 本発明に係わる実施例３のニップ部Ｎを拡大した横断面模型図。（２）はＡ部拡大図。The cross-sectional model figure which expanded the nip part N of Example 3 concerning this invention. (2) is an enlarged view of part A. 従来の加熱装置におけるニップ部Ｎを拡大した横断面模型図。The cross-sectional model figure which expanded the nip part N in the conventional heating apparatus.

符号の説明Explanation of symbols

１６ 定着フィルム
１７ 第一の摺動部材であるヒータ
１８ フィルムガイド
１９ 加圧部材
２０ 加圧用ステイ
２５ 定着フィルム寄り移動規制部材
２９，３０，３１，３２ 第二の摺動部材である突起部
Ｎ 定着ニップ部 16 Fixing Film 17 Heater as First Sliding Member 18 Film Guide 19 Pressing Member 20 Pressing Stay 25 Fixing Film Shift Movement Restricting Member 29, 30, 31, 32 Protrusions as Second Sliding Member N Fixing Nip part

Claims (4)

回転体と、回転体を加圧する加圧部材、及び回転体を支持する支持部材とを有し、回転体と加圧部材との当接によって形成される接触部で被加熱材を挟持搬送して被加熱材を加圧及び加熱する加熱装置において、
前記回転体と加圧部材との当接によって形成される接触部の回転体の内側に回転体と摺動する第一の摺動部材と第一の摺動部材の搬送方向下流に位置する第二の摺動部材を有し、前記接触部内で第二の接触部材の高さが搬送方向上流から下流に向かって高くなる部分を設けることを特徴とする加熱装置。 It has a rotating body, a pressure member that pressurizes the rotating body, and a support member that supports the rotating body, and sandwiches and conveys the material to be heated at a contact portion formed by contact between the rotating body and the pressing member. In the heating device that pressurizes and heats the material to be heated,
A first sliding member that slides with the rotating body inside the rotating body of the contact portion formed by contact between the rotating body and the pressure member, and a first sliding member that is located downstream in the transport direction of the first sliding member. A heating apparatus comprising: two sliding members, wherein a portion in which the height of the second contact member increases from the upstream in the transport direction toward the downstream in the contact portion is provided. 前記第二の摺動部材の搬送方向上流側端部の高さH2と、前記第一の摺動部材の高さH1との関係が、
H2＜H1
であることを特徴とする請求項１に記載の加熱装置。 The relationship between the height H2 of the upstream end in the transport direction of the second sliding member and the height H1 of the first sliding member is
H2 <H1
The heating apparatus according to claim 1, wherein: 前記第二の摺動部材の搬送方向上流側端部の高さH2と、前記第一の摺動部材の搬送方向下流側端部高さH11と、前記第一の摺動部材の中央部高さH12との関係が、
H11＜H2＜H12
であることを特徴とする請求項１に記載の加熱装置。 The height H2 of the upstream end in the transport direction of the second sliding member, the height H11 of the downstream end of the first sliding member in the transport direction, and the height of the central portion of the first sliding member The relationship with H12
H11 <H2 <H12
The heating apparatus according to claim 1, wherein: 前記第一の摺動部材は発熱体であることを特徴とする請求項１乃至３に記載の加熱装置。   The heating apparatus according to claim 1, wherein the first sliding member is a heating element.
JP2005129491A 2005-04-27 2005-04-27 Heating device Withdrawn JP2006310017A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016071333A (en) * 2014-09-29 2016-05-09 ブラザー工業株式会社 Fixation device
JP2020144296A (en) * 2019-03-08 2020-09-10 株式会社リコー Heating member, fixing device, and image forming apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016071333A (en) * 2014-09-29 2016-05-09 ブラザー工業株式会社 Fixation device
JP2020144296A (en) * 2019-03-08 2020-09-10 株式会社リコー Heating member, fixing device, and image forming apparatus
JP7240597B2 (en) 2019-03-08 2023-03-16 株式会社リコー Heating member, fixing device, image forming device

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