JPH086409A - Fixing device - Google Patents
Fixing deviceInfo
- Publication number
- JPH086409A JPH086409A JP13568494A JP13568494A JPH086409A JP H086409 A JPH086409 A JP H086409A JP 13568494 A JP13568494 A JP 13568494A JP 13568494 A JP13568494 A JP 13568494A JP H086409 A JPH086409 A JP H086409A
- Authority
- JP
- Japan
- Prior art keywords
- stay
- heating
- fixing device
- film
- pressurizing member
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Fixing For Electrophotography (AREA)
- Control Of Resistance Heating (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、複写機・プリンタ等の
画像形成装置における画像加熱定着装置（定着器）等と
して使用される定着装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device used as an image heating fixing device (fixing device) in an image forming apparatus such as a copying machine or a printer.
【０００２】[0002]
【従来の技術】図１０は特開昭６３−３１３１８２公
報、特開平２−１５７８７８号、特開平４−４４０７５
号乃至４４０８３号公報等に記載されている従来のフィ
ルム式定着装置を示す。図１０において、５は加圧ロー
ラで金属の軸材に柔らかいゴム部材で被覆する構造にな
っている。３は面状の発熱体（以下ヒータと呼ぶ）であ
り、ヒータホルダー２との間で接着によって保持されて
いる。４は定着フィルムであり、ＰＩ（ポリイミド）の
基層の外面にトナー離形性の良いＰＴＦＥの層をコーテ
ィングしたエンドレスの円筒状で、前記ヒータホルダー
２にゆるやかに外嵌している。2. Description of the Related Art FIG. 10 shows Japanese Patent Laid-Open Nos. 63-313182, 2-157878 and 4-44075.
The conventional film-type fixing device described in Japanese Patent Nos. In FIG. 10, a pressure roller 5 has a structure in which a metal shaft member is covered with a soft rubber member. Reference numeral 3 denotes a planar heating element (hereinafter referred to as a heater), which is held by bonding with the heater holder 2. A fixing film 4 has an endless cylindrical shape in which a base layer of PI (polyimide) is coated with a layer of PTFE having a good toner releasability, and is loosely fitted on the heater holder 2.
【０００３】ヒータホルダー２は樹脂性であり、両端の
バネ受け部に、バネ６から荷重を受ける事によって、フ
ィルム４を挟んで加圧ローラ５との間にニップを形成す
る。ヒータホルダーの上面、開口部には、数点の樹脂性
キャップ１０が固設されている。The heater holder 2 is made of resin and receives a load from the springs 6 at the spring receiving portions at both ends to form a nip between the film 4 and the pressure roller 5. Several resin caps 10 are fixedly mounted on the upper surface and the opening of the heater holder.
【０００４】加圧ローラの一端にはギヤが加圧ローラ軸
材の同軸上に取り付けられていて、不図示にモータから
ギヤ列等を介して加圧ローラに駆動力が伝達される。前
記ニップ部における、加圧ローラ・フィルム間の摩擦力
によって、フィルム４は内面のヒータを摺動しながら従
動回転する。前記キャップはフィルムの回転を円状に安
定させる役割を持つ。A gear is attached to one end of the pressure roller coaxially with the pressure roller shaft member, and a driving force is transmitted from a motor (not shown) to the pressure roller via a gear train or the like. Due to the frictional force between the pressure roller and the film at the nip portion, the film 4 is driven to rotate while sliding on the inner heater. The cap serves to stabilize the rotation of the film in a circular shape.
【０００５】不図示の現像装置によって、任意の画像を
形成された未定着トナーを担持した転写紙は、前記定着
器ニップ部に突入する。ヒータの加熱とニップ部の圧力
によってトナーは溶融固化し、画像は定着する。A transfer paper carrying an unfixed toner on which an arbitrary image is formed by a developing device (not shown) plunges into the fixing device nip portion. The toner is melted and solidified by the heating of the heater and the pressure of the nip portion, and the image is fixed.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら上記従来
例では、以下のような問題点があった。However, the above-mentioned conventional example has the following problems.
【０００７】（１）樹脂製のヒータホルダーに、高温下
で荷重をかけるため、ヒータホルダーがクリープによっ
て長手方向に永久変形し、ニップ部中央が圧抜けしてし
まう。 （２）定着器に小サイズ紙を通したとき、紙通過部は紙
によって熱が奪われるが、非通紙部は、熱が蓄積し、高
温になって材料の耐熱温度を超えたり、加圧ローラの不
均一な熱膨張によるフィルムねじれが生じたりする。上
記従来例では、ヒータホルダーやヒータホルダーに取り
付けられているキャップが樹脂製であるため、断熱効果
が大きく、非通紙部の温度上昇が大きい。(1) Since a load is applied to the resin heater holder at a high temperature, the heater holder is permanently deformed in the longitudinal direction by creep, and the center of the nip portion is released. (2) When small-sized paper is passed through the fixing device, heat is taken by the paper in the paper passage part, but heat is accumulated in the non-paper passage part and the temperature rises to a high temperature, exceeding the heat resistant temperature of the material, or applying heat. Film twist may occur due to uneven thermal expansion of the pressure roller. In the above conventional example, since the heater holder and the cap attached to the heater holder are made of resin, the heat insulating effect is large and the temperature rise of the non-sheet passing portion is large.
【０００８】（３）キャップは、熱膨張による反りを防
ぐため、長手方向になるべく短いものを数点に分けて取
り付けている。そのため部品点数が増えコストが上が
る。(3) In order to prevent the warp due to thermal expansion, the cap is attached at several points as short as possible in the longitudinal direction. Therefore, the number of parts increases and the cost increases.
【０００９】本発明の目的は、かかる３つの問題を解決
し、定着器の機能を改善した画像形成装置を提供するこ
とにある。An object of the present invention is to solve the above three problems and to provide an image forming apparatus having an improved fixing device function.
【００１０】[0010]
【課題を解決するための手段及び作用】上記目的を達成
するために、本発明による定着装置は、互いに圧接させ
た加熱・加圧部材と加圧ローラとの間に形成されるニッ
プ部に被加熱材を導入して通過させることにより加熱・
加圧部材の熱を被加熱材に付与する定着装置において、
前記加熱・加圧部材は、加熱体と、加熱体を保持する枠
体と、枠体を加圧する板金のステーと、加熱・加圧部材
の外周にあって、前記ニップ部において、加熱体と被加
熱材に挟まれ加熱体と摺動しながら被加熱材もしくは加
圧ローラと同速で移動する、耐熱性フィルムからなり、
前記ステーは、５０Ｗ／（ｍ・Ｋ）以上の熱伝導率を有
することを特徴とし、また、互いに圧接させた加熱・加
圧部材と加圧ローラとの間に形成されるニップ部に被加
熱材を導入して通過させることにより加熱・加圧部材の
熱を被加熱材に付与する定着装置において、前記加熱・
加圧部材は、加熱体と、加熱体を保持する枠体と、枠体
を加圧する板金のステーと、加熱・加圧部材の外周にあ
って、前記ニップ部において、加熱体と被加熱材に挟ま
れ加熱体と摺動しながら被加熱材もしくは加圧ローラと
同速で移動する、耐熱性フィルムからなり、前記フィル
ムの少なくとも１点は、前記ステーの表面から２ｍｍ以
下の位置を通過することを特徴とする。In order to achieve the above object, the fixing device according to the present invention covers a nip portion formed between a heating / pressurizing member and a pressure roller which are in pressure contact with each other. Heating by introducing and passing a heating material
In the fixing device that applies the heat of the pressure member to the material to be heated,
The heating / pressurizing member includes a heating body, a frame body that holds the heating body, a stay of sheet metal that pressurizes the frame body, and an outer periphery of the heating / pressurizing member. It consists of a heat-resistant film that is sandwiched between heated materials and moves at the same speed as the heated material or pressure roller while sliding on the heating body.
The stay is characterized by having a thermal conductivity of 50 W / (m · K) or more, and the stay is heated in a nip portion formed between the heating / pressurizing member and the pressure roller that are in pressure contact with each other. In the fixing device that applies the heat of the heating / pressurizing member to the material to be heated by introducing and passing the material,
The pressurizing member includes a heating body, a frame body that holds the heating body, a stay of sheet metal that pressurizes the frame body, and an outer periphery of the heating / pressurizing member. It is made of a heat-resistant film that is sandwiched between and moves at the same speed as the material to be heated or the pressure roller while sliding on the heating body, and at least one point of the film passes a position of 2 mm or less from the surface of the stay. It is characterized by
【００１１】上記手段により、本発明による定着装置
は、ヒータホルダーの変形を防止したり、非通紙部の昇
温を防止たりすることができる。By the above means, the fixing device according to the present invention can prevent the heater holder from being deformed and prevent the temperature rise of the non-sheet passing portion.
【００１２】[0012]
〈実施例１〉図１，２は本発明の一実施例を良く表す、
電子写真方式を用いたＬＢＰや複写機等の画像形成装置
におけるフィルム加熱方式の定着装置を示す。図１のよ
うにステー１、ヒータホルダー２、ヒータ３、定着フィ
ルム４、加圧ローラ５から主に構成されている。<Embodiment 1> FIGS. 1 and 2 well show one embodiment of the present invention.
1 illustrates a film heating type fixing device in an image forming apparatus such as an LBP and a copying machine using an electrophotographic method. As shown in FIG. 1, it is mainly composed of a stay 1, a heater holder 2, a heater 3, a fixing film 4, and a pressure roller 5.
【００１３】本実施例において、アルミニウム製の板材
から形成された逆Ｕ字形状のステー１は、ヒータホルダ
ー２の内側側壁部にゆるやかに収まる。ステー側面部と
ヒータホルダー内側側壁とはステーがヒータホルダーに
簡単に収まり、かつヒータホルダー内の熱がステーに容
易に伝達され得る間隔（本実施例では約０．５ｍｍ）が
あいている。前記ステー１の最下部（足部）１ａはヒー
タホルダー内面の平面部２ａに接地する。定着フィルム
摺動面であるステー上部の円弧１ｂの半径は、図のよう
にヒータホルダー２の最外周円２ｂより半径が約１ｍｍ
小さい。ステー１は、その長手方向の両端がヒータホル
ダー２から突き出ていて、ステー１両端部にあるバネ受
け部１ｃがバネ受け部材９を介してコイルバネ６によっ
て加圧され（本実施例では総圧約６〜８ｋｇ）、ステー
足部１ａを介して荷重がヒータホルダー長手方向に渡っ
て均一に伝達される。バネ受け部材は断熱性材料で、高
温のステーからバネを断熱してへたりを防ぐ。本実施例
において、ステー１は例えばアルミニウム等の金属製で
あり、５０Ｗ／（ｍ・Ｋ）以上の熱伝導率を有してお
り、ステーの板材の厚みは１．２ｍｍ〜３ｍｍである。
この厚みが薄いと加圧時の剛性が足りず、厚過ぎると熱
容量が大きくなり過ぎ定着時の熱効率が悪くなる。In the present embodiment, the inverted U-shaped stay 1 formed of an aluminum plate material is loosely fitted on the inner side wall portion of the heater holder 2. The stay side surface and the heater holder inner side wall are spaced from each other by a distance (about 0.5 mm in this embodiment) that allows the stay to easily fit in the heater holder and the heat in the heater holder to be easily transferred to the stay. The lowermost portion (foot portion) 1a of the stay 1 is grounded to the flat surface portion 2a on the inner surface of the heater holder. The radius of the arc 1b above the stay, which is the sliding surface of the fixing film, is about 1 mm from the outermost circle 2b of the heater holder 2 as shown in the figure.
small. The stay 1 has both ends in the longitudinal direction protruding from the heater holder 2, and spring receiving portions 1c at both end portions of the stay 1 are pressed by a coil spring 6 via a spring receiving member 9 (total pressure of about 6 in this embodiment). The load is evenly transmitted in the longitudinal direction of the heater holder via the stay leg portion 1a. The spring receiving member is made of a heat insulating material, and insulates the spring from the hot stay to prevent it from squatting. In this embodiment, the stay 1 is made of metal such as aluminum, has a thermal conductivity of 50 W / (m · K) or more, and the thickness of the plate material of the stay is 1.2 mm to 3 mm.
If this thickness is thin, the rigidity at the time of pressing is insufficient, and if it is too thick, the heat capacity becomes too large and the thermal efficiency at the time of fixing becomes poor.
【００１４】ヒータホルダー２はヒータ３と電気絶縁、
断熱する必要があるので耐熱性のある例えばフェノール
や液晶ポリマー、ＰＰＳ等の樹脂を用いる。The heater holder 2 is electrically insulated from the heater 3,
Since it is necessary to insulate heat, a heat-resistant resin such as phenol, liquid crystal polymer, or PPS is used.
【００１５】ヒータホルダー２の断面形状は図２のよう
に半円弧樋型であり、その最下部にはヒータを嵌合する
溝２ｃがあり、接着によってヒータを接合する。図３の
ように、ヒータホルダーは、ステーの変形を考慮してキ
ャップ接地部と、ヒータ接触面との間の肉厚を変化させ
ることによって、ヒータ接着面が長手方向にクラウン形
状（０．３ｍｍ前後）をなすようになっている。As shown in FIG. 2, the heater holder 2 has a semicircular trough-shaped cross section, and a groove 2c for fitting the heater is provided at the lowermost part of the heater holder 2, and the heater is joined by adhesion. As shown in FIG. 3, the heater holder changes the wall thickness between the cap grounding portion and the heater contact surface in consideration of the deformation of the stay, so that the heater bonding surface has a crown shape (0.3 mm) in the longitudinal direction. Before and after).
【００１６】ヒータホルダー外部側壁部は、フィルムが
面接触になってヒータホルダーにはり付かなくなるよう
に、ヒータホルダー外部側壁曲面部より約０．５ｍｍ高
いリブ２ｄが立っている。ヒータホルダー内部には、安
全装置である温度ヒューズ７とＡＣ線８が通っているの
で、ステー１とのリークを防ぐために、ステー・ＡＣ線
間にリブ２ｅが立っている。ヒータホルダー２の剛性は
後述の理由により、少なくともステー１の剛性の５０％
以下である必要があるため、側壁部の高さが従来例より
も約５ｍｍ低くなっている。ただし、定着フィルム４が
滑らかに摺動するため、外側のリブだけ上部に出張って
いる。The outer side wall of the heater holder is provided with a rib 2d which is about 0.5 mm higher than the curved surface of the outer side wall of the heater holder so that the film does not stick to the heater holder due to surface contact. Since the temperature fuse 7 as a safety device and the AC line 8 pass through the inside of the heater holder, a rib 2e is provided between the stay and the AC line in order to prevent a leak with the stay 1. The rigidity of the heater holder 2 is at least 50% of the rigidity of the stay 1 for the reason described below.
The height of the side wall is about 5 mm lower than that of the conventional example because it needs to be below. However, since the fixing film 4 slides smoothly, only the outer ribs travel to the upper part.
【００１７】定着フィルム４は、ＰＩの基層の外側にト
ナー離形性の良い例えばＰＴＦＥをコーティングしたエ
ンドレス円筒状をなし、ヒータホルダーとステーによっ
て形成されるほぼ円筒形状にゆるやかに外嵌し、ヒータ
ホルダーに接着されたヒータと加圧ローラは定着フィル
ムをはさんで圧接状態になって、ニップを形成してお
り、ニップ部において加圧ローラマサツ力によって、従
動回転する。そのとき、フィルムは、ステー上面を摺動
するかもしくはステー上面２ｍｍ以下を通過する。The fixing film 4 has an endless cylindrical shape in which the outside of the base layer of PI is coated with good toner releasability, for example, PTFE, and is loosely fitted into a substantially cylindrical shape formed by a heater holder and a stay, and a heater is formed. The heater and the pressure roller, which are bonded to the holder, are in pressure contact with each other across the fixing film to form a nip, and the nip portion is driven to rotate by the pressure roller mass force. At that time, the film slides on the stay upper surface or passes over the stay upper surface 2 mm or less.
【００１８】ヒータ３の表面には蒸着、スパッタリン
グ、スクリーン印刷等により形成された薄膜発熱抵抗部
があり、ヒータ３上には安全装置７およびヒータ温度を
検知する事によって不図示のＣＰＵをもってこのヒータ
温度を適切な温度に制御なさしめる温度検出装置（不図
示）を備えている。On the surface of the heater 3, there is a thin film heating resistance portion formed by vapor deposition, sputtering, screen printing or the like, and the safety device 7 and the heater temperature are detected on the heater 3 by a CPU (not shown). A temperature detection device (not shown) for controlling the temperature to an appropriate temperature is provided.
【００１９】この加熱装置を備えた電子写真方式のプリ
ンタは、不図示の画像形成部から形成された未定着トナ
ーＴによる画像を転写材Ｐ上にのせ、このトナーを定着
させるため、定着装置に転写材を送る。転写材Ｐは、前
述の加圧ローラ５によってフィルム４とともに搬送され
ると同時に、温調されたヒータ３によって加熱され、加
圧ローラ５とヒータ３間で形成されるニップ内で加圧さ
れることによってトナーＴが定着する。In the electrophotographic printer equipped with this heating device, an image by the unfixed toner T formed from an image forming portion (not shown) is placed on the transfer material P, and the toner is fixed. Send the transfer material. The transfer material P is conveyed together with the film 4 by the pressure roller 5 described above, and at the same time, is heated by the temperature-controlled heater 3 and is pressurized in the nip formed between the pressure roller 5 and the heater 3. As a result, the toner T is fixed.
【００２０】以下にキャップの動作・効果について加
圧した時、非通紙昇温が起った時、フィルムを摺動
させた時の３つの場合を説明する。The operation and effect of the cap will be described below in three cases, namely, when pressure is applied, when temperature rise occurs when no paper is passed, and when the film is slid.
【００２１】加圧した時 前述のようにステー１に圧をかけると、図４のａのよう
にステー１が弾性変形し、逆クラウン側に反る。ヒータ
ホルダー２はステー１にならって変形するため、ヒータ
ホルダーのヒータ接着面がストレート形状であると、ニ
ップの長手方向端部に圧が偏ってかかる。そこで本実施
例では、先に述べたようにヒータホルダー、ステー接地
面とヒータ接着面との間の肉厚を中央部が厚くなり、ヒ
ータ接着面がクラウン形状となるようにする事によっ
て、ニップ内の圧を均等にしている（図３，図４の
ｂ）。When pressure is applied to the stay 1 as described above when it is pressurized, the stay 1 is elastically deformed as shown in FIG. Since the heater holder 2 is deformed following the stay 1, if the heater bonding surface of the heater holder has a straight shape, pressure is unevenly applied to the longitudinal end portion of the nip. Therefore, in the present embodiment, as described above, the thickness between the heater holder, the stay grounding surface and the heater bonding surface is made thicker in the central portion and the heater bonding surface has a crown shape, so that the nip The inner pressure is made uniform (b in FIGS. 3 and 4).
【００２２】ヒータホルダーは樹脂性であるので、前記
のように応力がかかったまま高温で放置すると、クリー
プによって永久変形が起こり、ステー２の接地面２ａが
平面でなくなる（図４ｃ）。ここにステーによって荷重
をかけた時、ヒータホルダーの接地面２ａがストレート
の状態になるためには、端部に余分な圧Ｆ1 がかかって
しまう。Since the heater holder is made of resin, if it is left at a high temperature with stress applied as described above, permanent deformation occurs due to creep, and the grounding surface 2a of the stay 2 becomes non-planar (FIG. 4c). When a load is applied to the stay by the stay, in order for the grounding surface 2a of the heater holder to be in a straight state, an extra pressure F 1 is applied to the end portion.
【００２３】ヒータホルダーの変形分の圧Ｆ1 は、ヒー
タホルダーの剛性断面２次モーメント×ヤング率が小さ
ければ小さくなる。検討によればステーの断面剛性にく
らべヒータホルダーの剛性が５０％以下であれば、圧Ｆ
1 が本実施例の定着器の機能に影響を及ぼすことはな
い。The pressure F 1 of the deformation of the heater holder becomes small if the rigidity moment of inertia of the heater holder × Young's modulus is small. According to the examination, if the rigidity of the heater holder is 50% or less compared to the sectional rigidity of the stay, the pressure F
1 does not affect the function of the fixing device of this embodiment.
【００２４】非通紙昇温の時 定着器に封筒やはがき等の小サイズ紙を通した時、紙に
よって熱を奪われない非通紙部のヒータホルダーやフィ
イルムは、通紙部よりも高温になり、これを非通紙部昇
温という。At the time of temperature rise during non-sheet passing When a small size paper such as an envelope or a postcard is passed through the fixing device, the heater holder and the film in the non-sheet passing portion where the heat is not taken by the paper are higher than the paper passing portion. This is called the temperature rise in the non-sheet passing area.
【００２５】本実施例によれば、フィルムまたはヒータ
ホルダー内壁の非通紙側の熱がアルミニウム製のステー
１を通って通紙側に伝わることにより、非通紙部昇温を
最低限に抑えることができる。この場合非通紙昇温に効
果のあるアルミ・内壁間のすきまは１ｍｍ以下である。
また、フィルムがステー上面２ｍｍ以下の位置を通過す
るときも、非通紙昇温は検知される。According to this embodiment, the heat of the non-sheet passing side of the film or the inner wall of the heater holder is transmitted to the sheet passing side through the stay 1 made of aluminum, and the temperature rise of the non sheet passing portion is suppressed to the minimum. be able to. In this case, the clearance between the aluminum and the inner wall, which is effective for raising the temperature of non-sheet passing, is 1 mm or less.
Further, even when the film passes a position where the stay upper surface is 2 mm or less, the non-sheet passing temperature rise is detected.
【００２６】フィルム摺動の時 前述の非通紙昇温が起ったとき、加圧ローラ５の非通紙
側が通紙側に比べ熱膨張が大きいため、フィルム駆動に
速度差が生じ、フィルムが座屈してねじれる現象が起き
る。When the film slides, when the temperature of the non-paper feed is raised, the non-paper feed side of the pressure roller 5 has a larger thermal expansion than the paper feed side. The phenomenon of buckling and twisting occurs.
【００２７】本実施例のステーは、通常時はフィルムに
線接触し、フィルムねじれが生じたときに、その座屈を
フィルムの内側から支えられるような位置にある。The stay of this embodiment is in a position where it normally comes into line contact with the film, and when the film is twisted, its buckling can be supported from the inside of the film.
【００２８】〈実施例２〉本発明の実施例２について図
５を参照して説明する。<Second Embodiment> A second embodiment of the present invention will be described with reference to FIG.
【００２９】本実施例においては、アルミニウム製ステ
ーの上面を平面にして、その上部に、長手方向に伸びる
１個の樹脂性のキャップ部材１０を取り付ける。他の構
成は実施例１と同じである。定着フィルムの摺動面が金
属から樹脂になることによって、マサツ係数が減じ、フ
ィルム摺動がより容易になる。本実施例は、キャップ部
は樹脂性であるが、下部にアルミニウムの板材が存在す
ることによって、従来例よりも非通紙昇温の緩和が図れ
る。In the present embodiment, the upper surface of the aluminum stay is made flat and one resin cap member 10 extending in the longitudinal direction is attached to the upper part thereof. Other configurations are the same as those of the first embodiment. By changing the sliding surface of the fixing film from metal to resin, the Masatsu coefficient is reduced, and the film sliding becomes easier. In this embodiment, the cap portion is made of resin, but the presence of the aluminum plate material in the lower portion makes it possible to alleviate the non-sheet-passage temperature rise more than the conventional example.
【００３０】〈実施例３〉次に本発明の実施例３に関し
図６を参照して説明する。<Third Embodiment> Next, a third embodiment of the present invention will be described with reference to FIG.
【００３１】本実施例において、加圧時のステー１の変
形による圧の偏りを矯正するために、ステー１の最下部
１ａの形状を長手方向にわたってクラウン形状にする。In the present embodiment, the shape of the lowermost portion 1a of the stay 1 is made to be a crown shape in the longitudinal direction in order to correct the pressure deviation due to the deformation of the stay 1 during pressurization.
【００３２】本実施例によれば、電子写真装置のプロセ
ススピードの変化に簡単に対応し得る定着装置を提供す
ることができる。According to this embodiment, it is possible to provide a fixing device which can easily cope with a change in the process speed of the electrophotographic apparatus.
【００３３】電子写真装置のプロセススピードが上昇す
ると、所定のトナー定着の機能を満たすために、ニップ
の加圧力が増加する。例えば４ｐｐｍ（枚／分）の装置
には５ｋｇｆ、６ｐｐｍの装置には７ｋｇｆ、８ｐｐｍ
の装置には９ｋｇｆの総加圧力が必要である。加圧力が
増加すると、ステーの弾性変形量も増加するので、プロ
セススピードの異なる電子写真装置に、同じ定着装置を
組み込むと、均等なニップを得ることができない。As the process speed of the electrophotographic apparatus increases, the pressure applied to the nip increases in order to satisfy a predetermined toner fixing function. For example, 5kgf for a 4ppm (sheets / minute) device, 7kgf for a 6ppm device, 8ppm
The device requires a total pressure of 9 kgf. As the applied pressure increases, the elastic deformation amount of the stay also increases. Therefore, if the same fixing device is incorporated in an electrophotographic apparatus having a different process speed, it is impossible to obtain a uniform nip.
【００３４】本実施例においては、プロセススピードに
よって最適な足部のクラウン量をもったステーを設定す
ることができ、プロセススピードの変化にステーの入れ
替えだけで対応することが可能である。In this embodiment, it is possible to set the stay having the optimum crown amount of the foot according to the process speed, and it is possible to cope with the change in the process speed by simply replacing the stay.
【００３５】〈実施例４〉本発明の実施例４につき図７
を参照して説明する。<Fourth Embodiment> FIG. 7 shows a fourth embodiment of the present invention.
Will be described with reference to.
【００３６】本実施例では、フィルム４をガイドする機
能を持ったヒータホルダー２に、上面が開いたコの字状
のステー１が嵌挿され、その上面部に、フィルム４をガ
イドするキャップ１０がはまる構成をとる。駆動が加圧
ローラ５で行なわれること、ステー１に加圧される事等
その他の構成は実施例１と同じである。本実施例では、
キャップ１０は断面略きのこ形状をなし、その剛性が高
くステーの変形が抑制されるとともに、キャップ及びス
テーの構造が簡単である。In this embodiment, a U-shaped stay 1 having an open upper surface is fitted into a heater holder 2 having a function of guiding the film 4, and a cap 10 for guiding the film 4 is provided on the upper surface. Take a configuration that fits. Other configurations such as driving by the pressure roller 5 and pressure applied to the stay 1 are the same as those in the first embodiment. In this embodiment,
The cap 10 has a substantially mushroom-shaped cross section, has high rigidity, suppresses deformation of the stay, and has a simple structure of the cap and the stay.
【００３７】〈実施例５〉本発明の実施例５に関し図８
を参照して説明する。<Fifth Embodiment> FIG. 8 shows a fifth embodiment of the present invention.
Will be described with reference to.
【００３８】本実施例は、実施例１や実施例３のように
フィルム４がステー１に摺動する構成であって、かつ、
金属性のステー１をアースにおとす構成をとる。In this embodiment, the film 4 slides on the stay 1 as in the first and third embodiments, and
The metal stay 1 is grounded.
【００３９】フィルム４は、帯電したトナーの飛び散り
を押えたり、ステー１との摩耗による静電ノイズを防ぐ
ため、アースに落ちていなければならない。本実施例に
よればステー１をアースに落とすことによって、単体で
はアースのとりにくいフィルムをより容易にアースに落
とすことができる。The film 4 must be grounded in order to suppress the scattering of the charged toner and to prevent electrostatic noise due to abrasion with the stay 1. According to the present embodiment, by dropping the stay 1 to the ground, it is possible to easily drop the film, which is difficult to be grounded by itself, to the ground.
【００４０】又、本実施例は、図９に示すような、フィ
ルム駆動の定着装置にも適用できる。ここで、１１はフ
ィルム駆動ローラ、１２はフィルムにテンションを与え
る従動ローラである。The present embodiment can also be applied to a film-dried fixing device as shown in FIG. Here, 11 is a film drive roller, and 12 is a driven roller that gives tension to the film.
【００４１】不図示の駆動ギヤから駆動力を伝達された
駆動ローラ１１は、回転することによって、駆動ロー
ラ、従動ローラ、ニップ部の３点にテンションをもって
かかっているフィルムを駆動する。The drive roller 11 to which the drive force is transmitted from a drive gear (not shown) rotates to drive the film having tension applied to three points of the drive roller, the driven roller and the nip portion.
【００４２】加圧ローラ５は、フィルムを挟んでヒータ
と圧接状態になっており、フィルム又は紙の摩擦力によ
って従動回転する。The pressure roller 5 is in pressure contact with the heater across the film, and is rotated by the frictional force of the film or paper.
【００４３】[0043]
【発明の効果】以上説明したように、本発明によれば、
定着ニップ部に均等に圧をかけることができ、非通紙部
昇温を緩和することができ、またフィルムのねじれを防
止することができる。As described above, according to the present invention,
Pressure can be evenly applied to the fixing nip portion, temperature rise in the non-sheet passing portion can be moderated, and twisting of the film can be prevented.
【図１】本発明による定着装置の実施例１の分解斜視図FIG. 1 is an exploded perspective view of a first embodiment of a fixing device according to the present invention.
【図２】本発明の実施例１の横断面図FIG. 2 is a cross-sectional view of the first embodiment of the present invention.
【図３】本発明の実施例１の概略側面図FIG. 3 is a schematic side view of the first embodiment of the present invention.
【図４】本発明の実施例１の作用効果を示した説明図FIG. 4 is an explanatory diagram showing a function and effect of the first embodiment of the present invention.
【図５】本発明による定着装置の実施例２の横断面図FIG. 5 is a cross-sectional view of a fixing device according to a second embodiment of the present invention.
【図６】本発明の実施例３の概略側面図FIG. 6 is a schematic side view of a third embodiment of the present invention.
【図７】本発明の実施例４の横断面図FIG. 7 is a cross-sectional view of a fourth embodiment of the present invention.
【図８】本発明による定着装置の実施例５の分解斜視図FIG. 8 is an exploded perspective view of a fifth embodiment of the fixing device according to the present invention.
【図９】本発明の実施例５の変形例を示す横断面図FIG. 9 is a cross-sectional view showing a modified example of the fifth embodiment of the present invention.
【図１０】従来の定着装置の一例の横断面図FIG. 10 is a cross-sectional view of an example of a conventional fixing device.
１…ステー ２…ヒータホル
ダー ３…ヒータ ４…フィルム ５…加圧ローラ ６…加圧バネ ７…温度ヒューズ ８…ＡＣ線 ９…バネ受け部材 １０…モールド
キャップ1 ... Stay 2 ... Heater holder 3 ... Heater 4 ... Film 5 ... Pressure roller 6 ... Pressure spring 7 ... Temperature fuse 8 ... AC line 9 ... Spring receiving member 10 ... Mold cap
Claims (8)
ローラとの間に形成されるニップ部に被加熱材を導入し
て通過させることにより加熱・加圧部材の熱を被加熱材
に付与する定着装置において、 前記加熱・加圧部材は、加熱体と、加熱体を保持する枠
体と、枠体を加圧する板金のステーと、加熱・加圧部材
の外周にあって、前記ニップ部において、加熱体と被加
熱材に挟まれ加熱体と摺動しながら被加熱材もしくは加
圧ローラと同速で移動する、耐熱性フィルムからなり、 前記ステーは、５０Ｗ／（ｍ・Ｋ）以上の熱伝導率を有
することを特徴とする定着装置。1. The heat of the heating / pressurizing member is introduced into the nip portion formed between the heating / pressurizing member and the pressure roller, which are in pressure contact with each other, and passes through the nip portion. In the fixing device for applying the heating / pressurizing member, the heating / pressurizing member includes a heating body, a frame body that holds the heating body, a sheet metal stay that presses the frame body, and an outer periphery of the heating / pressurizing member. In the nip portion, a heat-resistant film that is sandwiched between the heating body and the heated material and moves at the same speed as the heated material or the pressure roller while sliding on the heating body, and the stay is 50 W / (mK ) A fixing device having the above thermal conductivity.
ローラとの間に形成されるニップ部に被加熱材を導入し
て通過させることにより加熱・加圧部材の熱を被加熱材
に付与する定着装置において、 前記加熱・加圧部材は、加熱体と、加熱体を保持する枠
体と、枠体を加圧する板金のステーと、加熱・加圧部材
の外周にあって、前記ニップ部において、加熱体と被加
熱材に挟まれ加熱体と摺動しながら被加熱材もしくは加
圧ローラと同速で移動する、耐熱性フィルムからなり、 前記フィルムの少なくとも１点は、前記ステーの表面か
ら２ｍｍ以下の位置を通過することを特徴とする定着装
置。2. The heat of the heating / pressurizing member is introduced by introducing the material to be heated into a nip portion formed between the heating / pressurizing member and the pressure roller, which are in pressure contact with each other, and passing the heated material. In the fixing device for applying the heating / pressurizing member, the heating / pressurizing member includes a heating body, a frame body that holds the heating body, a sheet metal stay that presses the frame body, and an outer periphery of the heating / pressurizing member. In the nip portion, a heat-resistant film which is sandwiched between the heating body and the heating target material and moves at the same speed as the heating target material or the pressure roller while sliding on the heating body, and at least one point of the film is the stay. A fixing device that passes a position of 2 mm or less from the surface of the fixing device.
Ｋ）以上であることを特徴とする請求項２記載の定着装
置。3. The stay has a thermal conductivity of 50 W / (m.multidot.m).
The fixing device according to claim 2, wherein the fixing device is K) or more.
ながら回転運動することを特徴とする請求項１乃至３の
いずれかに記載の定着装置。4. The fixing device according to claim 1, wherein the film rotates while being guided by the frame.
との距離が長手方向にわたって、加熱体側が凸となるク
ラウン形状であるか、もしくは前記ステーのエッジが長
手方向にわたって、加熱体側が凸となるクラウン形状で
あることを特徴とする請求項１乃至４のいずれかに記載
の定着装置。5. The frame has a crown shape in which the heating body holding surface of the frame and the stay ground contact surface extend in the longitudinal direction and the heating body side is convex, or the edge of the stay extends in the longitudinal direction and the heating body side extends. The fixing device according to any one of claims 1 to 4, wherein the fixing device has a convex crown shape.
し、複数の加圧力に対して、適切なクラウン量を選択す
ることによって、前記ニップ部長手方向の圧分布を均等
にすることを特徴とする請求項１乃至５のいずれかに記
載の定着装置。6. The pressure distribution in the longitudinal direction of the nip portion is made uniform by configuring the frame body and the stay to be replaceable and selecting an appropriate crown amount for a plurality of pressing forces. The fixing device according to claim 1, wherein the fixing device is a fixing device.
を特徴とする請求項１乃至６のいずれかに記載の定着装
置。7. The fixing device according to claim 1, wherein the stay is grounded.
徴とする請求項１乃至７のいずれかに記載の定着装置。8. The fixing device according to claim 1, wherein the stay is made of aluminum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06135684A JP3121210B2 (en) | 1994-06-17 | 1994-06-17 | Fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06135684A JP3121210B2 (en) | 1994-06-17 | 1994-06-17 | Fixing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH086409A true JPH086409A (en) | 1996-01-12 |
| JP3121210B2 JP3121210B2 (en) | 2000-12-25 |
Family
ID=15157505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06135684A Expired - Lifetime JP3121210B2 (en) | 1994-06-17 | 1994-06-17 | Fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3121210B2 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP3121210B2 (en) | 2000-12-25 |
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