JPH02134665A - Image forming device - Google Patents

Abstract

PURPOSE:To minimize the calorific capacity of a heating body by traveling a recording material that fixes a picture at a constant speed so as to bed in close contact with a fixing film and permitting the heating body to heat and melt a toner picture through the fixing film. CONSTITUTION:A transfer sheet P carried to a fixing device 20 along a guide 10 from a transfer part 8 and carried with an unfixed toner picture Ta enters between the fixing sheet 40 of a press-contact part N of the heating body 21 with a press roller 22 and the press roller 22. The face of the unfixed toner picture passes by a mutual press-contact part N at the speed the same as the carrying speed of the sheet P, receiving pinching force, while the face is overlapped with the back of the turning fixing film 40 in the same direction. Consequently, the heating body 21 heats and melts the toner picture made of heat melting toner on the sheet P through the fixing film 40, and its surface is completely softened and melted. Thus, the calorific capacity of the heating body can be minimized without developing fixing defect and offset.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は、複写機・レーザビームプリンタ・ファクシミ
リΦマイクロフィルムリーグプリンタ参画像表示（デイ
スプレィ）装置・記録機等の画像形成袋とに関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an image forming bag for copying machines, laser beam printers, facsimile Φ microfilm league printers, image display devices, recording machines, and the like.

更に詳しくは、電子写真−静電記録・磁気記録等の適宜
の画像形成プロセス手段により加熱溶融性の樹脂等より
成るトナーを用いて記録材（エレクトロファックスシー
）−静電記録シート・転写材シート・印刷紙など）の面
に直接方式もしくは！１１接（転写）方式で目的の画像
情報に対応した未定着のトナー画像を形成担持させ、該
未定着のトナー画像を該画像を担持している記録材面に
水久固着画像として加熱定着処理する方式の画像形成装
置に関する。More specifically, electrophotography - Recording material (electrofax) - Electrostatic recording sheet/transfer material sheet using a toner made of heat-meltable resin etc. by an appropriate image forming process means such as electrostatic recording or magnetic recording.・Direct method on the surface of printing paper, etc.) or! An unfixed toner image corresponding to the target image information is formed and carried using the 11-contact (transfer) method, and the unfixed toner image is heat-fixed as a permanent fixed image on the surface of the recording material carrying the image. The present invention relates to an image forming apparatus that uses

（従来の技術） 従来、この種の装置に用いられている定着装置は、所定
の温度に維持された加熱ローラと、弾性層を有して該加
熱ローラに圧接する加圧ローラとによって、未定着のト
ナー画像が形成された記録材を挟持搬送しつつ加熱する
ローラ定着方式が多用されている。(Prior Art) Conventionally, a fixing device used in this type of device uses a heating roller maintained at a predetermined temperature and a pressure roller having an elastic layer and in pressure contact with the heating roller. A roller fixing method is often used in which a recording material on which a toner image has been formed is heated while being nipped and conveyed.

（発明が解決しようとする問題点） しかしながら、この種の装置では、加熱ローラにトナー
が転移するいわゆるオフセット現象を防止するために、
加熱ローラを最適な温度に維持する必要があり、加熱ロ
ーラあるいは加熱体の熱容量を太きくしなければならな
かった。すなわち、加熱ローラの熱容量が小さい場合に
は、発熱体による供給熱量との関係により通紙あるいは
他の外的要因で加熱ローラ温度が低温側あるいは高温側
に大きく変動し易くなる。低温側に変動した場合には、
トナーの軟化溶融不足によって、定着不良や低温オフセ
ットを生じ、高温側に変動した場合には、トナーが完全
に溶融してしまいトナーの凝集力が低下するために、高
温オフセットを生ずる。(Problems to be Solved by the Invention) However, in this type of device, in order to prevent the so-called offset phenomenon in which toner is transferred to the heating roller,
It is necessary to maintain the heating roller at an optimal temperature, and the heat capacity of the heating roller or heating element must be increased. That is, when the heat capacity of the heating roller is small, the temperature of the heating roller tends to fluctuate greatly toward a lower temperature side or a higher temperature side due to paper passing or other external factors due to the relationship with the amount of heat supplied by the heating element. If the temperature changes to the low temperature side,
Insufficient softening and melting of the toner causes fixing failure and low-temperature offset, and when the temperature changes to the high temperature side, the toner is completely melted and the cohesive force of the toner decreases, resulting in high-temperature offset.

この問題を回避するために、加熱ローラの熱容量を大き
くすると、加熱ローラを所定の温度まで昇温するための
時間が長くなり、装置の使用の際に待機時間が大きくな
るという別の問題が生ずる。In order to avoid this problem, increasing the heat capacity of the heating roller increases the time it takes to heat the heating roller to a predetermined temperature, causing another problem of increasing standby time when using the device. .

本発明は、上述の従来装置の有していた問題点を解決し
、定着不良やオフセットを生ずることなく加熱体の熱容
量を小さくすることを可能とし、その結果、待機時間や
消費電力、さらには機内昇温の小さい、またその他にも
顕著な特長を有する画像形成装置を提供することを目的
とする。The present invention solves the problems of the conventional apparatus described above, and makes it possible to reduce the heat capacity of the heating element without causing fixing failure or offset. As a result, standby time, power consumption, and It is an object of the present invention to provide an image forming apparatus that causes a small temperature rise inside the machine and has other remarkable features.

（問題点を解決するための手段） 本発明は。(Means for solving problems) The present invention is.

記録材面に加熱溶融性の樹脂等より成るトナーを担持さ
せて目的の画像情報に対応した未定着のトナー画像を形
成する画像形成手段と 定着フィルムと、該定着フィルムの走行駆動手段と、該
定着フィルムを中にしてその一方面側に配置された加熱
体と、他面側に配置され、前記加熱体に対して該定着フ
ィルムを介して記録材の未定着トナー画像担持側の面を
密着させる加圧部材を備え、前記画像形成手段側から搬
送されてくる未定着トナー画像を担持した記録材の搬送
速度と同一速度で同一方向に走行駆動させた定着フィル
ムと前記加圧部材との間に該記録材を導入して未定着ト
ナー画像を記録材面に加熱定着するトナー画像加熱定着
手段と、 装置の記録材搬送経路を搬送される記録材のジャム発生
を検知するジャム検知手段と、該ジャム検知手段のジャ
ム検知信号にもとずいて装置作動の緊急停止がなされる
ことにより走行停止の状態になった定着ファルムに対し
て引張り外力が作用しても該引張り外力に抗して定着フ
ィルムの移動を阻止する手段と、 を有することを特徴とする画像形成装置を要旨とする。An image forming means for forming an unfixed toner image corresponding to target image information by carrying toner made of a heat-melting resin or the like on the surface of a recording material; a fixing film; a means for driving the fixing film; A heating body is placed on one side of the fixing film with the fixing film inside, and a heating body is placed on the other side, and the unfixed toner image bearing side of the recording material is brought into close contact with the heating body through the fixing film. between the fixing film and the pressure member, which is driven to run in the same direction at the same speed as the conveyance speed of the recording material carrying the unfixed toner image conveyed from the image forming means side. a toner image heat fixing unit that heats and fixes the unfixed toner image on the surface of the recording material by introducing the recording material into the recording material, and a jam detection unit that detects the occurrence of a jam in the recording material conveyed through the recording material conveyance path of the apparatus. Even if a tensile external force is applied to the fixing film which has stopped running due to an emergency stop of the device operation based on the jam detection signal of the jam detecting means, the fixing film resists the tensile external force. The gist of the present invention is an image forming apparatus comprising: means for preventing movement of a film;

（作用） （１）記録材の搬送方向と同一速度で同一方向に走行駆
動状態の定着フィルムと加圧部材との間に導入された画
像定着すべき記録材は、定着フィルム面に未定着トナー
画像担持側の面が密着して定着フィルムと一緒の重なり
状態で加熱体と加圧部材との相互圧接部を挟圧力を受け
つつ互に速度差による面ズレを生じたり、しわ寄ったり
することなく一体的に重なり密着して通過していく。(Function) (1) The recording material to which the image is to be fixed is introduced between the fixing film and the pressure member, which are running in the same direction at the same speed as the recording material conveyance direction, and the unfixed toner remains on the fixing film surface. When the image bearing side surface is in close contact with the fixing film and overlapped with the fixing film, the mutual pressure contact portion of the heating body and the pressure member is subjected to a squeezing force, and the surfaces become misaligned or wrinkled due to the speed difference between them. They overlap and pass through in close contact with each other.

■加熱工程 この相互用接部通過過程で記録材面の未定着トナー画像
が定着フィルムを介して加熱体によって加熱軟化・溶融
され、特に、その表層部はトナー融点を大きく上回り完
全に軟化・溶融する。この場合加熱体と加圧部材の相互
圧接部において加熱体・定着フィルム・トナー画像・記
録材は加圧部材によって良好に抑圧密着されて効果的に
熱伝達されることにより、短い時間の加熱によってトナ
ーは十分に軟化・溶融されて良好な定着性が得られる。■Heating process During this process of passing through the mutual contact area, the unfixed toner image on the recording material surface is heated and softened and melted by the heating body through the fixing film, and in particular, the surface layer is completely softened and melted, exceeding the toner melting point. do. In this case, the heating body, fixing film, toner image, and recording material are well compressed and adhered to each other by the pressure member at the mutual pressure contact portion of the heating body and the pressure member, and heat is transferred effectively, so that the heat can be heated for a short time. The toner is sufficiently softened and melted to provide good fixing properties.

一方記録材自体の昇温は実際上極めて小さく熱エネルギ
ーの無駄が少ない、つまり実質的に記録材自体は加熱せ
ず、トナーのみを効果的に加熱軟化・溶融して低電力で
トナー画像の加熱定着を良好に実行できる。On the other hand, the temperature rise of the recording material itself is actually extremely small and there is little waste of thermal energy.In other words, the recording material itself is not heated, and only the toner is effectively heated to soften and melt, thereby heating the toner image with low power. Fixation can be performed well.

ここで本発明で記述されるトナーの軟化・溶融に関して
注記する。トナーの「融点」と便宜的に表現している温
度は、トナーが定着するために最低必要な温度を意味し
ており、その定着下限温度で、溶融といえる程粘度が低
下する場合や、軟化といった程度の粘度低下の場合があ
る。したがって定着する際に溶融と便宜的に表現してい
る場合でも、実際には軟化といった程度の粘度低下を示
している場合がある０本発明ではこのような場合も含む
、同様に、トナーが冷却固定したと便宜的に表現してい
る場合も、トナーによっては固化とはいえず高粘度化と
いった方が適切である場合がある０本発明ではこのよう
な場合も含む。Here, a note will be made regarding the softening and melting of the toner described in the present invention. The temperature conveniently expressed as the toner's "melting point" refers to the minimum temperature required for the toner to fix. In some cases, the viscosity decreases to such an extent. Therefore, even when the toner is conveniently expressed as melting during fixing, it may actually indicate a decrease in viscosity to the extent of softening.The present invention also includes such cases; Even when it is conveniently expressed as "fixed," depending on the toner, it may be more appropriate to say "high viscosity" rather than "solidification." The present invention also includes such cases.

■冷却工程 定着フィルム面に密着して加熱体と加圧部材との相互圧
接部を順次に通過するトナー画像加熱軟化・溶融済みの
記録材部分は圧接部通過後も定着フィルム面に密着させ
たままの搬送を引続きしばらく続行させ、この間を冷却
工程として前記加熱工程で軟化ｅ溶融させたトナーの熱
を放熱させてトナーを冷却固定させる。この冷却固化で
トナーの凝集力は非常に大きくなって一団となって挙動
することになり、又記録材側に対する粘着・固着力が増
大する一方、定着フィルム側に対するそれは極めて低下
していく、記録材に対してはトナーは前記加熱工程で加
熱軟化・溶融された際加圧部材によって加圧されるため
、少なくともトナー画像の一部は記録材表面層に浸透し
、その浸透分の冷却固化によるアンカー効果で冷却固化
トナーの記録材側に対する粘着・固着力が増大する。■Cooling process The toner image that is in close contact with the fixing film surface and sequentially passes through the mutual pressure contact area of the heating body and the pressure member.The recording material portion that has been softened and melted by heating is kept in close contact with the fixing film surface even after passing through the pressure contact area. The conveyance is continued for a while, and this period is used as a cooling process, in which the heat of the toner softened and melted in the heating process is radiated to cool and fix the toner. Due to this cooling and solidification, the cohesive force of the toner becomes extremely large, causing it to behave as a group, and while the adhesion and adhesion force to the recording material side increases, the cohesive force to the fixing film side decreases significantly. When the toner is heated and softened and melted in the heating process, it is pressurized by the pressure member, so at least a part of the toner image penetrates into the surface layer of the recording material, and the amount of the toner image that penetrates is solidified by cooling. The anchor effect increases the adhesion and adhesion of the cooled and solidified toner to the recording material side.

■分離工程 上記の冷却工程によりトナー画像の冷却固化がなされた
後、定着フィルム面から記録材を順次に分離させる。こ
の分離時にはトナー画像は冷却固化で記録材に対する粘
着・固着力が十分に大きく、定着フィルムに対するそれ
は極めて小さい状態となっているから、画像定着済みの
記録材部分は定着フィルムに対するトナーオフセットを
発生することなく容易に順次に分離されていく。(2) Separation process After the toner image is cooled and solidified in the above cooling process, the recording material is sequentially separated from the fixing film surface. At the time of this separation, the toner image is cooled and solidified and has a sufficiently large adhesion/fixing force to the recording material, but the adhesion/fixing force to the fixing film is extremely small, so the portion of the recording material where the image has been fixed generates toner offset with respect to the fixing film. They are easily separated one after another without any problems.

かくして走行する定着フィルム面に未定着トナー画像担
持面が面するように画像定着すべき記録材を同一速度で
上記定着フィルムに密着走行せしめ、該定着フィルムを
介して加熱体によりトナー画像を加熱溶融せしめ、トナ
ー像が冷却固定化した後に記録材と定着フィルムとを離
反させているので定着フィルムに対するトナーオフセッ
トを発生することがなく、かつ熱容量の小さい発熱体を
用い、その発熱体への給電を簡素な構成のもとに行なう
ことが可能となり、定着するためにトナーを昇温させる
べき温度（融点または軟化点）に対して、十分に高い温
度の加熱体を維持することによってトナー画像を効率的
に加熱することが回旋となり、少ないエネルギーで定着
不良のない十分良好な定着が可能となり、その結果、装
置使用時の待機時間や、消費電力、さらには機内昇温の
小さな画像形成装置を得るという効果を奏する。In this way, the recording material on which the image is to be fixed is made to run in close contact with the fixing film at the same speed so that the unfixed toner image bearing surface faces the running fixing film surface, and the toner image is heated and melted by a heating body through the fixing film. In addition, since the recording material and the fixing film are separated after the toner image is cooled and fixed, toner offset with respect to the fixing film does not occur, and a heating element with a small heat capacity is used, and power is supplied to the heating element. This can be done with a simple configuration, and by maintaining the heating element at a temperature sufficiently high compared to the temperature (melting point or softening point) at which the toner should be heated for fixing, the toner image can be improved efficiently. The rotational heating allows for sufficiently good fixing without defective fixing with less energy, resulting in an image forming device that requires less standby time when the device is in use, consumes less power, and has less internal temperature rise. This effect is achieved.

（２）通常の画像形１＆装置は、装置内の記録材搬送経
路（シートパス）に給送された記録材が紙詰まり等で正
しく搬送されない所謂ジャムトラブルを生じた場合には
ジャム検知信号により装置駆動を緊急自動停止させる構
成となっている。そしてジャム記録材の取り除き処置を
して装置駆動を再開始させるものである。(2) Normal image type 1 & devices use a jam detection signal when a so-called jam trouble occurs in which the recording material fed to the recording material conveyance path (sheet path) in the device is not conveyed correctly due to a paper jam, etc. It is configured to automatically stop the device drive in an emergency. Then, the jammed recording material is removed and the device is restarted.

この場合定着手段の加熱体と加圧部材との間に記録材が
挟み込まれている状態で装着駆動が停止しているときは
加熱体と加圧部材との相互圧接を解除手段の操作により
解除してから該記録材の取り除きをするものであるが、
装置使用者は往々にしてその圧力解除操作を失念して加
熱体と加圧部材との間に挟み込み状態の記録材を無理に
引張って加熱体と加圧部材との相互圧接力に抗して引抜
き除去する場合も少なからずあった。In this case, if the recording material is sandwiched between the heating body and the pressure member of the fixing means and the loading drive is stopped, the mutual pressure contact between the heating body and the pressure member is released by operating the release means. After that, the recording material is removed.
Device users often forget to release the pressure and forcefully pull the recording material sandwiched between the heating element and the pressure member to resist the mutual pressing force between the heating element and the pressure member. In many cases, they were pulled out and removed.

本発明における定着手段のように加熱体と加圧部材との
間に定着フィルムを介在させこの定着フィルムを介して
記録材のトナー画像を加熱定着させる方式の定着手段の
場合においては、加熱体と加圧部材との相互圧接を解除
しないまま挟み込み記録材を無理に引張って引抜き除去
すると、その引抜きに伴なって記録材と一緒に挟み込み
状態にある定着フィルムも記録材との摩擦力で引きずら
れて移動し、記録材が斜めに引抜かれてようなときは定
着フィルムが斜行移動して波打ち面状態となり、この波
打ち面状態のフィルムが引続く記録材引抜きに伴なう引
きずり移動で加熱体と加圧部材との圧接部に進入したと
き加圧力で押しつぶされてフィルム面に局所的に２重折
りのシワすじ部を生じることになる。In the case of the fixing means of the present invention, in which a fixing film is interposed between the heating body and the pressure member, and the toner image on the recording material is heated and fixed via this fixing film, the heating body and If the sandwiched recording material is forcibly pulled and removed without releasing the mutual pressure contact with the pressure member, the fixing film sandwiched together with the recording material will be dragged along with the recording material due to the frictional force. When the recording material is pulled out diagonally, the fixing film moves diagonally and becomes a wavy surface, and this wavy film is dragged by the heating body as the recording material is pulled out. When the film enters the pressure contact area between the film and the pressure member, it is crushed by the pressure, resulting in local double-fold wrinkles on the film surface.

そのようなシワはフィルム自体の塑性変形なのでその後
自然に戻り解消されることはなく、該シワ部とシワ部以
外のフィルム面部とでは加熱定着時の熱伝導や加圧力に
加熱体と加圧部材との圧接部の長子方向に関して不均一
を生じ、その結果記録材上の画像に定着ムラを生じ、定
着フィルムの交換という事態に至ることにもなる。Since such wrinkles are plastic deformation of the film itself, they will not return to normal and disappear after that, and the wrinkles and the surface area of the film other than the wrinkles will be affected by heat conduction and pressure during heat fixing by the heating body and pressure member. Non-uniformity occurs in the longitudinal direction of the pressure contact portion, which results in uneven fixing of the image on the recording material, leading to the need to replace the fixing film.

本発明においてはジャム検知手段のジャム検知信号にも
とずいて装置作動の緊急停止がなされることにより走行
停止状態になった定着フィルムに対して引張り外力が作
用しても該引張り外力に抗して定着フィルムの移動を阻
止する手段を具備させたので、ジャム処理時に仮に加熱
体と加圧部材との相互圧接の解除操作を失念して両者間
に定着フィルムと共に挟み込み状態にある記録材を無理
に引張って引抜き除去しても定着フィルムは移動阻止状
態にされているから引抜き記録材との摩擦力で引きずら
れて移動することがなく記録材だけが加熱体と加圧部材
との圧接部の定着フィルム面と加圧部材との間をすべり
移動して引抜かれる。In the present invention, even if a tensile external force is applied to the fixing film which has stopped running due to an emergency stop of the device operation based on the jam detection signal of the jam detecting means, the apparatus can resist the tensile external force. Since the fixing film is equipped with a means for preventing movement of the fixing film, it is possible to prevent the recording material, which is caught between the heating body and the pressure member together with the fixing film, from being squeezed between them by forgetting to release the mutual pressure contact between the heating body and the pressure member when handling a jam. Even if the fixing film is pulled out and removed, the fixing film is in a state where it is prevented from moving, so it will not be dragged and moved by the frictional force with the recording material, and only the recording material will be in contact with the pressure part between the heating body and the pressure member. The fixing film slides between the surface of the fixing film and the pressure member and is pulled out.

従って定着フィルムが波打ち面状態となって引抜き記録
材と共に加熱体と加圧部材との圧接部へ弓ずられて移動
してシワ付きダメージを生じることが厳に防止される。Therefore, it is strictly possible to prevent the fixing film from becoming corrugated and being bent and moved along with the pulled-out recording material to the pressure contact portion between the heating body and the pressure member, thereby causing wrinkles and damage.

（実施例） 〈実施例−１〉　（第１〜３図） 本例装置は原稿載置台往復動型・回転ドラム型拳転写式
の電子写真複写装置である。(Example) <Example 1> (Figs. 1 to 3) The apparatus of this example is an electrophotographic copying apparatus of a reciprocating document table type and a rotary drum type fist transfer type.

（１）装ごの全体的概略構成（第１図）第１図において
、ｌＯＯは装置機筺、ｌは該機筺の上面板１００ａ上に
配設したガラス板等の透明板部材よりなる往復動型の原
稿截置台であり、機筺上面板１００ａ上を図面上右方ａ
、左方ａに夫々所定の速度で往復移動駆動される。(1) Overall schematic configuration of the equipment (Fig. 1) In Fig. 1, lOO is the equipment housing, and l is a reciprocating member made of a transparent plate member such as a glass plate disposed on the top plate 100a of the equipment housing. It is a movable original cutting table, and the upper surface plate 100a of the machine case is placed on the right side a in the drawing.
, are driven to reciprocate in the left direction a at predetermined speeds.

Ｇは原稿であり、複写すべき画像面側を下向きにして原
稿截首台１の上面に所定の載置基準に従って載こし、そ
の上に原稿圧着板１ａをかぶせて押え込むことによりセ
ットされる。G is a document, which is placed on the top surface of the document cutting table 1 according to a predetermined placement standard with the image side to be copied facing downward, and is set by placing the document pressure bonding plate 1a over it and pressing it down. .

１ＯＯｂは機筺上面板１０　、Ｏａ面に原稿ａｉ？！ｉ
台１の往復移動方向とは直角の方向（紙面に垂直の方向
）を長手として開口された原稿照明部としてのスリット
開口部である。原稿数は台ｌ上にａ装置セットした原稿
Ｇの下向き画像面は原稿載置台ｌの右方ａへの往動移動
過程で右辺側から左辺側にかけて順次にスリット開口部
ｔｏｏｂの位置を通過していき、その通過過程でランプ
７の光Ｌｌをスリット開口部１００ｂ、透明な原稿ａδ
台ｌを通して受けて照明走査される。その照明走査光の
原稿面反射光が短焦点小径結像素子アレイ２によって感
光ドラム３面に結像露光される。1OOb is the top plate 10 of the machine housing, and the original ai is on the Oa side. ! i
A slit opening serving as a document illumination section is opened with the longitudinal direction perpendicular to the reciprocating direction of the table 1 (direction perpendicular to the paper surface). As for the number of originals, the downward image surface of the original G set on device A on table L passes through the position of the slit opening toob sequentially from the right side to the left side during the forward movement of document mounting table L to the right side a. In the process of passing, the light Ll of the lamp 7 passes through the slit opening 100b and the transparent original aδ.
The illumination is scanned through the platform l. The illumination scanning light reflected from the document surface is imaged and exposed on the surface of the photosensitive drum 3 by the short focus and small diameter imaging element array 2.

感光ドラム３は例えば酸化亜鉛感光層・有機半導体感光
層等の感光層３ａが被覆処理され、中心支軸３ｂを中心
に所定の周速度で矢示すの時計方向に回転駆動され、そ
の回転過程で帯電器４により正極性又は負極性の−様な
帯電処理を受け、その−様帯電面に前記の原稿画像の結
像露光（スリット露光）を受けることにより感光ドラム
３面には結像露光した原稿画像に対応した静電潜像が順
次に形成されていく。The photosensitive drum 3 is coated with a photosensitive layer 3a such as a zinc oxide photosensitive layer or an organic semiconductor photosensitive layer, and is driven to rotate clockwise as shown by an arrow around a central support shaft 3b at a predetermined circumferential speed. The charged surface of the photosensitive drum 3 is subjected to image-forming exposure (slit exposure) by being subjected to a positive or negative charging process by the charger 4, and subjected to image-forming exposure (slit exposure) of the original image on the charged surface thereof. Electrostatic latent images corresponding to the original image are sequentially formed.

この静電潜像は現像器５により加熱で軟化溶融する樹脂
等より成るトナーにて順次に顕像化され、該顕像たるト
ナー画像が転写部としての転写放電器８の配設部位へ移
行していく。This electrostatic latent image is sequentially visualized by a developing device 5 using toner made of a resin or the like that softens and melts when heated, and the developed toner image is transferred to a location where a transfer discharger 8 is provided as a transfer section. I will do it.

Ｓは記録材としての転写材シー）Ｐを積載収納したカセ
ットであり、該カセット内のシートが給送ローラ６の回
転により１枚宛繰出し給送され。S is a cassette loaded with transfer material P as a recording material, and the sheets in the cassette are fed one by one by the rotation of the feeding roller 6.

次いでレジストローラ９により、ドラム３上のトナー画
像形成部の先端が転写放電器８の部位に到達したとき転
写材シートＰの先端も転写放電器８と感光ドラム３との
開位置に丁度到達して両者−致するようにタイミングど
りされて同期給送される。そしてその給送シートの面に
対して転写放電器８により感光ドラム３側のトナー画像
が順次に転写されていく。Next, by the registration rollers 9, when the leading edge of the toner image forming portion on the drum 3 reaches the transfer discharger 8, the leading edge of the transfer material sheet P also reaches the open position between the transfer discharger 8 and the photosensitive drum 3. The timing is adjusted so that the two match, and the two are fed synchronously. Then, the toner image on the photosensitive drum 3 side is sequentially transferred onto the surface of the fed sheet by the transfer discharger 8.

転写部でトナー画像転写を受けたシートは不図示の分離
手段で感光ドラム３面から順次に分離されて搬送ガイド
１０によって後述する定着装置２０に導かれて担持して
いる未定着トナー画像の加熱定着処理を受け、画像形成
物（コピー）として機外の排紙トレイ１１上に排出され
る。The sheet to which the toner image has been transferred in the transfer section is sequentially separated from the three surfaces of the photosensitive drum by a separating means (not shown), and guided by a conveyance guide 10 to a fixing device 20, which will be described later, to heat the unfixed toner image carried thereon. After undergoing a fixing process, the image is discharged onto a paper discharge tray 11 outside the machine as an image formed product (copy).

一方、トナー画像転写後の感光ドラム３の面はクリーニ
ング装ｆｆ１１２により転写残りトナー等の付着汚染物
の除去を受け、全面霧光Ｌ２による除電を受けて電気的
残留メモリの消去がなされて縁り返して画像形成に使用
される。On the other hand, the surface of the photosensitive drum 3 after the toner image has been transferred is subjected to removal of adhered contaminants such as residual toner by a cleaning device ff112, and electricity is removed by the fog light L2 on the entire surface, and electrical residual memory is erased and the edges are removed. It is then used for image formation.

ＰＨ１は給送ローラ６とレジストローラ９との間のシー
トパス部分に配設した給紙検出センサ（例えばフォトセ
ンサ）、ＰＨ２は定着装置２０の次位に配設した排紙検
出センサ（同）である。PH1 is a paper feed detection sensor (for example, a photo sensor) disposed in the sheet path section between the feed roller 6 and the registration roller 9, and PH2 is a paper discharge detection sensor (for example, a photo sensor) disposed next to the fixing device 20. It is.

（２）定着装２１２０（第２・３図） 第２図は画像定着実行状態にある定着装置部分の拡大図
である。(2) Fixing device 2120 (FIGS. 2 and 3) FIG. 2 is an enlarged view of a portion of the fixing device in an image fixing state.

４０はエンドレスベルト状の定着フィルムであり、左右
一対の並行ターンローラ対（巻取リローラと送出しロー
ラ）４１・４２１１１１に懸回張設しである。Reference numeral 40 designates an endless belt-like fixing film, which is stretched around a pair of left and right parallel turn rollers (take-up reroller and delivery roller) 41 and 421111.

２１は上記エンドレス定着フィルム４０の下行測定若フ
ィルム部分の上側面（内面側）に対して下面を接触させ
て配設した加熱体である。Reference numeral 21 denotes a heating body disposed with its lower surface in contact with the upper surface (inner surface side) of the downward measuring film portion of the endless fixing film 40.

２２は金属等より成る芯材上にシリコンゴム等より成る
弾性層を有する加圧部材としての加圧ローラであり、定
着フィルム４０の下行側のフィルム部分を挟んで加熱体
の下面に所定の当接圧をもって対向圧接させである。即
ち本実施例では該加圧ローラ２２の両端部２２ａは夫々
右端側を支軸４３を中心に上下揺動自由にした加圧レバ
ー４４に軸受支持させてあり、該加圧レバーの左端側を
引上げばね４５により吊って支軸４３を中心に常時持上
げ回動付勢することにより加圧ローラ２２の上面を定着
フィルム４０を挟んで加熱体２１の下面に例えばＡ４＠
で総圧４〜６ｋｇをもって対向圧接させである。Reference numeral 22 denotes a pressure roller as a pressure member having an elastic layer made of silicone rubber or the like on a core material made of metal or the like, and is placed in a predetermined contact with the lower surface of the heating body with the film portion on the downward side of the fixing film 40 sandwiched therebetween. They are pressed against each other with contact pressure. That is, in this embodiment, the right end of both ends 22a of the pressure roller 22 is supported by bearings on a pressure lever 44 that can freely swing up and down about a support shaft 43, and the left end of the pressure lever 44 is supported by bearings. By constantly lifting and rotating the pressure roller 22 around the support shaft 43 by the lifting spring 45, the upper surface of the pressure roller 22 is attached to the lower surface of the heating body 21 with the fixing film 40 in between, for example, A4@
They are pressed against each other with a total pressure of 4 to 6 kg.

４６は圧力解除用の押し釦であり、この釦を押すことに
よりレバー４７のｉｆピン４８が押されてレバー４７が
支軸４９を中心に２点鎖線示のように時計方向に回動し
、その回動力で加圧レバー４４の左端側の上辺がレバー
４７の第２ビン５０で押下げ力を受け、その押上げ力で
加圧レバー４４が支軸４３を中心に引上げばね４５に抗
して２点鎖線示のように押下げられて加圧ローラ２２が
加熱体２１の下方へ降下して加圧ローラ２２と加熱体２
１との間に隙間ができて加圧圧接が解除される。押し釦
４６の抑圧を解除すれば元の加圧圧接状態に復帰する。46 is a push button for releasing pressure, and when this button is pressed, the if pin 48 of the lever 47 is pushed, and the lever 47 rotates clockwise around the support shaft 49 as shown by the two-dot chain line. Due to the rotational force, the upper side of the left end of the pressure lever 44 receives a downward force from the second pin 50 of the lever 47, and due to the upward force, the pressure lever 44 resists the pull-up spring 45 around the support shaft 43. The pressure roller 22 is pushed down as shown by the two-dot chain line, and the pressure roller 22 is lowered below the heating body 21, so that the pressure roller 22 and the heating body 2
1, and the pressure welding is released. When the push button 46 is released, the original pressurized state is restored.

−度釦４６を十分に押すとその押し状態がロックされて
戻り止めされることにより釦から指を離しても圧力解除
状態が保持され、再度釦を押すと上記のロックが解除さ
れて元の加圧圧接状態に復帰する押し鎖構造にすること
もできる。- When the button 46 is pressed sufficiently, the pressed state is locked and detented, so that even if the button is released, the pressure release state is maintained, and when the button is pressed again, the above lock is released and the original state is restored. It is also possible to use a push-chain structure that returns to the pressure-welded state.

加圧ローラ２２は定着フィルム４０を挟んで加熱体２１
の下面に対して加圧圧接した状ＩＥにおいて不図示の駆
動ギヤトレインにより、画像転写部８からガイド１０を
介して定着装置２０へ搬送される転写材シートＰの搬送
速度と同一の周速度をもって反時計方向に回転駆動され
る。これに伴ない該加圧ローラ２２と加熱体２１との間
に挟まれている定着フィルム部分に送り力がかかりエン
ドレスの定着フィルム４０が加熱体２１の下面に密着し
つつローラ４１・４２１１．ｌを加熱ローラ２２の回転
周速と同一の周速で時計方向に回動状態になる。The pressure roller 22 is connected to the heating body 21 with the fixing film 40 in between.
In the state IE in pressure contact with the lower surface of the sheet, a drive gear train (not shown) has the same circumferential speed as the transport speed of the transfer material sheet P that is transported from the image transfer section 8 to the fixing device 20 via the guide 10. It is rotated counterclockwise. As a result, a feeding force is applied to the portion of the fixing film sandwiched between the pressure roller 22 and the heating body 21, and the endless fixing film 40 is brought into close contact with the lower surface of the heating body 21 while the rollers 41, 4211. 1 is rotated clockwise at the same circumferential speed as the rotational circumferential speed of the heating roller 22.

この場合ローラ４２には適度の回転負荷を与えてあり、
この回転負荷により少なくとも該ローラ４２と加熱体２
１との間の定着フィルム部分は常に緊張した状態で走行
する。第３図はローラ４２に対する回転負荷機構部の断
面図を示している。In this case, an appropriate rotational load is applied to the roller 42,
This rotational load causes at least the roller 42 and the heating element 2 to
The part of the fixing film between the two parts always runs under tension. FIG. 3 shows a cross-sectional view of the rotational load mechanism for the roller 42. As shown in FIG.

即ち４２ａはローラ４２の一端側の回転中心軸であり、
軸受は側板５１から外方へ突出させ、その突出軸部分４
２ｂは横断面り形軸にしである。２は軸受は側板５１の
外面に軸４２ａと略同心に固定した摩擦板、５３は突出
軸部分４２ｂに軸方向にスライド自由に外嵌した摩擦仮
押え、５５は突出軸部分４２ｂの端末部に外嵌して固定
したばね押え、５４は前記摩擦仮押え５３とばね押え５
５との間に縮設したばねである。摩擦仮押え５３はばね
５４の押圧力により常時摩擦板５２に押し付けられて接
触しており該両部材５２−５３の相互摩擦力がローラ４
２の回転負荷として作用する。That is, 42a is the rotation center axis on one end side of the roller 42,
The bearing is made to protrude outward from the side plate 51, and its protruding shaft portion 4
2b is the end of the cross-sectionally rectangular shaft. Reference numeral 2 denotes a bearing, which is a friction plate fixed substantially concentrically with the shaft 42a on the outer surface of the side plate 51; 53, a friction retainer fitted externally to freely slide in the axial direction on the protruding shaft portion 42b; and 55, a friction plate attached to the end of the protruding shaft portion 42b. A spring holder 54 is fitted and fixed to the outside, and 54 is the friction temporary holder 53 and the spring holder 5.
This is a spring compressed between 5 and 5. The friction temporary presser foot 53 is constantly pressed against and in contact with the friction plate 52 due to the pressing force of the spring 54, and the mutual frictional force between the two members 52-53 is applied to the roller 4.
Acts as a rotational load of 2.

６０は定着フィルム移動阻止手段である０本例の該手段
は、ローラ４２の一端側に同心に一体に設けた爪型６１
と該爪型６１に係脱揺動するレバー６２と、該レバーを
揺動させる電磁ソレノイド−プランジャ６３とからなる
。６２ａはレバー６２の揺動中心軸、６２ｂは該レバー
６２の一方の腕部にＡｆ＋させた、爪型６１に対する係
脱風である。６３ａは電磁ソレノイド−プランジャ６３
の進退プランジャであり、その下端と前記レバー６２の
他方の腕端とをビン６３ｂで連結しである。Reference numeral 60 denotes fixing film movement blocking means. This means in this example includes a claw type 61 integrally provided concentrically on one end side of the roller 42.
It consists of a lever 62 that swings into and out of engagement with the pawl type 61, and an electromagnetic solenoid plunger 63 that swings the lever. Reference numeral 62a denotes a pivot axis of the lever 62, and reference numeral 62b denotes an engagement/disengagement wind for the pawl type 61, which is made Af+ on one arm of the lever 62. 63a is an electromagnetic solenoid plunger 63
The lower end of the plunger is connected to the other arm end of the lever 62 by a pin 63b.

電磁ソレノイド−プランジャ６３に対する通電は常時は
オフであり、そのためプランジャ６３ａが自重で下方に
垂下し、それに連動してレバー６２が反時計方向に回動
されて該レバー６２の係脱風６２ｂがローラ４２側の爪
型６１から外方に逃げた位こにある実線示の状態に保持
されている。電磁ソレノイドに通電がなされるとプンジ
ャ６３ａが上方へ引き上げられてレバー６２が２点鎖線
示のように時計方向に回動され、レバー６２の係脱風６
２ａが爪型６１に係合した状態になり、ローラ４２が回
転止めされる０回動駆動されるエンドレスの定着フィル
ム４０は繰返してトナー画像の加熱定着に供されるから
、耐熱性・離型性・耐久性に優れた薄肉（例えば数ＪＬ
ｍ−数１０ｇｍ）のものがよく、例えばＰＥＡ樹脂（四
フッ化エチレンーパーフルオロアルキルビニルエーテル
共重合体樹脂）やＰＩ樹脂（ポリイミド樹脂）などのフ
ィルムは定着フィルムとして適している。ＰＦＡ樹脂は
四フッ化エチレン系の合成樹脂で、高温で安定である他
に、摩擦係数が小さく、化学薬品に対して安定である等
の特長がある。ＰＩ樹脂も優れた＃熱性、耐薬品性、機
械的特性を備え、さらに寸法安定性を右している。The electromagnetic solenoid-plunger 63 is normally energized, so the plunger 63a hangs downward under its own weight, and in conjunction with this, the lever 62 is rotated counterclockwise, and the air 62b for engaging and disengaging the lever 62 is moved by the roller. It is held in the state shown by the solid line at a position that escapes outward from the claw mold 61 on the 42 side. When the electromagnetic solenoid is energized, the puncher 63a is pulled upward and the lever 62 is rotated clockwise as shown by the two-dot chain line.
2a is engaged with the claw mold 61, and the roller 42 is stopped from rotating. The endless fixing film 40 is driven 0 rotations and is repeatedly used to heat and fix the toner image, thereby improving heat resistance and release. Thin wall with excellent strength and durability (for example, several JL)
For example, a film made of PEA resin (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin) or PI resin (polyimide resin) is suitable as a fixing film. PFA resin is a synthetic resin based on tetrafluoroethylene, and has features such as being stable at high temperatures, having a small coefficient of friction, and being stable against chemicals. PI resin also has excellent heat resistance, chemical resistance, mechanical properties, and dimensional stability.

加熱体２１はアルミナ等の耐熱性でかつ電気絶縁性の基
材またはそれを含む複合部材より成る基材の下面に、例
えば幅１６０ｇｍ、長さ（紙面に直角な方向の長さ）２
１６ｍｍで例えばＴａｚＮ等より成る線状もしくは帯状
の発熱部２８を有し、さらにその表面に摺動保護層とし
て例えば、Ｔａ２０ｓが形成されている。加熱体２１の
下面は平滑であり、かつ前後端部は丸みを帯びていて定
着フィルム４０面とのスムーズな摺動を可能にしている
。The heating element 21 has a width of 160 gm and a length (length in the direction perpendicular to the paper) of 2 on the lower surface of a base material made of a heat-resistant and electrically insulating base material such as alumina or a composite member containing the same.
It has a 16 mm linear or band-shaped heating section 28 made of, for example, TazN, and further has a sliding protective layer of, for example, Ta20s formed on its surface. The lower surface of the heating body 21 is smooth, and the front and rear ends are rounded to enable smooth sliding on the surface of the fixing film 40.

上記加熱体２１の発熱部２８は熱容量が小さく、不図示
の通電回路によりパルス状に通電されてその都度瞬時に
２６０〜３００″″Ｃ前後まで昇温する。The heat generating portion 28 of the heating body 21 has a small heat capacity, and is energized in a pulsed manner by an energizing circuit (not shown), and its temperature is instantaneously raised to about 260 to 300''C each time.

而して、転写部８からガイド１０に沿って定着？ｃ２ｔ
２０へ搬送された。未定着トナー画像Ｔａを担持した転
写材シートＰは、加熱体２１と加圧ローラ２２との圧接
部Ｎの定着シート４０と加圧ローラ２２との間に進入し
て未定着トナー画像面がシートＰの搬送速度と同一速度
で同方向に回動状態の定着フィルム４０の下面（下行側
フィルム部分の下面）と−緒の重なり状態で加熱体２１
と加圧ローラ２２との相互圧接部Ｎを挟圧力を受けつつ
通過していく、シートＰの未定着トナ゛−画像面は相互
圧接部Ｎに進入するまでは加圧ローラ２２と加熱体２１
との間の定着フィルム部分の下面に対して非接触状態に
保たれている。Then, it is fixed along the guide 10 from the transfer section 8? c2t
Transported to 20. The transfer material sheet P carrying the unfixed toner image Ta enters between the fixing sheet 40 and the pressure roller 22 at the pressure contact portion N between the heating body 21 and the pressure roller 22, so that the unfixed toner image surface is transferred to the sheet. The heating body 21 is overlapped with the lower surface of the fixing film 40 (the lower surface of the descending film portion) which is rotating in the same direction at the same speed as the conveying speed of P.
The unfixed toner-image surface of the sheet P passes through the mutual pressure contact area N between the sheet P and the pressure roller 22 while being subjected to a clamping force, and the unfixed toner-image surface of the sheet P passes through the mutual pressure contact area N between the pressure roller 22 and the heating body 21 until it enters the mutual pressure contact area N.
The fixing film is kept in a non-contact state with the lower surface of the fixing film portion between the fixing film and the fixing film.

この相互圧着部Ｎ通過過程を加熱工程として前記（作用
）の（１）−０項に述べたトナー画像の加熱軟化・溶融
が行なわれる１本実施例における加熱工程は前述のごと
く、加熱体２１に線状の発熱部２８を設け、加熱体２１
と一体的に形成された低熱容量の上記発熱部２８にパル
ス状に通電し発熱を繰り返すように構成された加熱体２
１によって行なわれている。即ち所定の搬送速度で搬送
速度で搬送されたシー）Ｐ上のトナー画像Ｔａはシー１
−Ｐの搬送速度に準じてズレなく搬送される定着フィル
ム４０とともに、順次加熱体２１の発熱部２８の幅に応
じて決定される線状の発熱部の有効幅内Ｗに送り込まれ
て加熱を受けて軟化・溶融像Ｔｂとなる。This process of passing through the mutual pressure bonding portion N is a heating process in which the toner image is heated to soften and melt as described in (1)-0 of (Operation).As described above, the heating process in this embodiment is as follows. A linear heating section 28 is provided in the heating body 21.
A heating element 2 configured to repeatedly generate heat by supplying electricity in a pulsed manner to the heat generating portion 28 having a low heat capacity and integrally formed with the heating element 28.
It is carried out by 1. That is, the toner image Ta on the sheet P transported at a predetermined transport speed is
-The fixing film 40 is conveyed without deviation according to the conveyance speed of P, and is sequentially fed into the effective width W of the linear heat generating part determined according to the width of the heat generating part 28 of the heating body 21 to be heated. As a result, a softened and melted image Tb is formed.

加熱体２１と加圧ローラ２２との相互圧接部Ｎを通過し
たシート部分は駆動ローラ４１の位置へ到達するまでの
間は定着フィルム４０の下面に引き続き密着したまま搬
送されていく、搬送ガイド３２はシートＰの裏面を支え
て定着フィルム４０との密着を維持する作用をする。The sheet portion that has passed through the mutual pressure contact portion N between the heating body 21 and the pressure roller 22 is conveyed by the conveyance guide 32 while remaining in close contact with the lower surface of the fixing film 40 until it reaches the position of the drive roller 41. serves to support the back surface of the sheet P and maintain close contact with the fixing film 40.

この搬送過程を冷却工程として前記（作用）の（１）−
０項に述べたように軟化・溶融トナーＴｂの熱が自然放
熱されてトナーの冷却固化Ｔｃがなされる。放熱フィン
部材等を配設して強制冷却する構成にすることもできる
。This conveyance process is used as a cooling process in the above (action) (1)-
As described in item 0, the heat of the softened and melted toner Tb is naturally radiated, and the toner is cooled and solidified Tc. It is also possible to provide a configuration in which a radiation fin member or the like is provided to perform forced cooling.

モしてローラ４１の位置へ到達すると、定着フィルム４
０は曲率の大きいローラ４１の面に沿ってシート２面か
ら離れる方向に走行方向が転向されて定着フィルム４０
とシートＰとが互いに分離して排紙トレイ１１へ排紙さ
れていく、この分離時点までにはトナーは十分に冷却固
化して前記（作用）の（１）−０項に述べたようにシー
トＰに対するトナーの粘着・固着力が十分に大きく、定
着フィルム４０に対するそれは極めて小さい状態となっ
ているから定着フィルム４０とシートＰの分離は定着フ
ィルム４０に対するトナーオフセットを実質的に発生す
ることなく容易に順次になされる。When it reaches the position of the roller 41, the fixing film 4
0, the running direction of the fixing film 40 is turned away from the sheet 2 surface along the surface of the roller 41 with a large curvature.
and sheet P are separated from each other and ejected to the paper ejection tray 11. By the time of this separation, the toner has been sufficiently cooled and solidified, as described in (1)-0 of (Operation) above. Since the adhesion and adhesion force of the toner to the sheet P is sufficiently large and that to the fixing film 40 is extremely small, the fixing film 40 and the sheet P can be separated without substantially causing toner offset to the fixing film 40. Easily made sequentially.

本実施例においては加熱体２１の線状の発熱部２８は通
電により瞬時にトナーの融点（ないし足前可能温度）に
対して充分な高温に昇温するので、加熱体の予備加熱が
不要であり、非定着時における加圧ローラ２２への伝熱
は少ない、又定着時においても定着フィルム、トナー画
像、シートが加熱体２１と加圧ローラ２２との間に介在
しかつ発熱時間が短いことによって急激な温度勾配が生
ずる為、加圧ローラ２２は昇温にしくく実用上必要とさ
れる程度の連続的な画像形成を行なってもその温度はト
ナーの融点以下に維持される。In this embodiment, the temperature of the linear heat generating portion 28 of the heating body 21 is instantaneously raised to a high enough temperature relative to the melting point (or possible temperature) of the toner when energized, so there is no need to preheat the heating body. Yes, there is little heat transfer to the pressure roller 22 during non-fixing, and even during fixing, the fixing film, toner image, and sheet are interposed between the heating body 21 and the pressure roller 22, and the heat generation time is short. As a result of this, a sharp temperature gradient is generated, so that the pressure roller 22 is difficult to rise in temperature, and its temperature is maintained below the melting point of the toner even if continuous image formation is performed to the extent required for practical use.

かかる構成の本実施例装置にあっては、シートＰ上にの
加熱触性のトナーより成るトナー画像は先ず、定着フィ
ルム４０を介して加熱体２１によって加熱溶融され、特
に、その表層部は完全に軟化溶融する。この際、加圧ロ
ーラ２２によって加熱体、定着フィルム、トナー画像、
シートは良好に密着されており、効率的に熱伝達される
。これによりシートＰ自体の加熱は極力抑えてトナー画
像を効率的に加熱溶融させることができ、特に、通電発
熱時間を限定することにより、省エネルギー化を図るこ
とができる。In the apparatus of this embodiment having such a configuration, the toner image made of heat-tactile toner on the sheet P is first heated and melted by the heating body 21 via the fixing film 40, and in particular, the surface layer portion thereof is completely melted. to soften and melt. At this time, the heating body, fixing film, toner image,
The sheets are well bonded and provide efficient heat transfer. Thereby, the heating of the sheet P itself can be suppressed as much as possible, and the toner image can be efficiently heated and melted. In particular, by limiting the time for energization and heat generation, it is possible to save energy.

加熱体は小型もので十分でありそのため熱容量が小さく
なり、予め加熱体を昇温させる必要がないので、非画像
形成時の消費電力も小さくすることができ、また機内昇
温も防止できることになる。A small heating element is sufficient, so its heat capacity is small, and there is no need to heat up the heating element in advance, so power consumption during non-image formation can be reduced, and temperature rise inside the machine can also be prevented. .

本実施例では、加圧ローラ２２の温度は上述したように
トナーの融点よりも低く維持されているので、トナー画
像加熱工程に引くつづく冷却工程のトナー画像の放熱を
促進することが可能である。この為、冷却に要する時間
が短くて済み、装置を小型化することができる。In this embodiment, since the temperature of the pressure roller 22 is maintained lower than the melting point of the toner as described above, it is possible to promote heat dissipation of the toner image in the cooling process following the toner image heating process. . Therefore, the time required for cooling can be shortened, and the device can be downsized.

（３）ジャムトラブル 常時は、前述したように加圧ローラ２２は第２図の実線
示のように引上げばね４５による加圧レバー４４の時計
方向への回動力で定着フィルム４０を介して加熱体２１
の下面に対して加圧圧接した状７ｆｉに保持され、又定
着フィルム移動阻止手段６０の電磁ソレノイド−プラン
ジャ６３に対する通電はオフであり、ローラ４２に一体
の爪型６１からレバー６２に係脱風６２ｂが２点鎖線示
のように逃げ位置に保持されていて、定着装置２０は定
着処理可能状態に維持されている。(3) In the case of jam trouble, as described above, the pressure roller 22 is moved to the heating body via the fixing film 40 by the clockwise rotational force of the pressure lever 44 by the pull-up spring 45, as shown by the solid line in FIG. 21
The electromagnetic solenoid-plunger 63 of the fixing film movement prevention means 60 is not energized, and the claw 61 integrated with the roller 42 is connected to the lever 62 to release the air. 62b is held in the escape position as shown by the two-dot chain line, and the fixing device 20 is maintained in a state where it can perform fixing processing.

一方、画像形成スタート信号に基いて転写材シートＰの
給送が開始されたことが給紙検出センサＰＨ１（第１図
）で検知されてから所定の時間経過後も排紙検出センサ
ＰＨ２で定着済みシートの排紙が検出されないときは不
図示の制御回路において転写材シートの搬送異常、即ち
所謂シートジャムの発生と判断され、即時に装置が緊急
停止状態になされると共に、電磁ソレノイド−プランジ
ャ６３に対して通電がなされレバー６２の爪部６２ｂが
ローラ４２の風車６１に係合した２点鎖線示の状態とな
る。即ちローラ４２が回り止めされた状態になる。On the other hand, even after a predetermined period of time has elapsed after the paper feed detection sensor PH1 (Fig. 1) detects that the feeding of the transfer material sheet P has started based on the image formation start signal, the paper ejection detection sensor PH2 fixes the image. When the ejection of a completed sheet is not detected, a control circuit (not shown) determines that there is an abnormality in conveyance of the transfer material sheet, that is, a so-called sheet jam has occurred, and the apparatus is immediately put into an emergency stop state, and the electromagnetic solenoid plunger 63 is activated. is energized, and the claw portion 62b of the lever 62 is engaged with the windmill 61 of the roller 42, as shown by the two-dot chain line. That is, the roller 42 is in a state where it is prevented from rotating.

オペレータは、上記のようなシートジャムによる装置の
緊急停止を生じたときは、圧力解除用の押し釦４６を押
すことにより加圧ローラ２２と加熱体２１との圧接を解
除して該圧接部Ｎの定着フィルム４０と加圧ローラ２２
間で挟持されているジャム転写材Ｐを解放することによ
り該ジャム転写材シートの取り出し除去を抵抗なく支障
なく容易に行なうことができる。When an emergency stop of the apparatus occurs due to a sheet jam as described above, the operator releases the pressure contact between the pressure roller 22 and the heating body 21 by pressing the pressure release push button 46 and releases the pressure contact part N. fixing film 40 and pressure roller 22
By releasing the jammed transfer material P held between them, the jammed transfer material sheet can be easily taken out and removed without any resistance or trouble.

ジャム処理後は押し釦４６の抑圧を解除して加圧ローラ
２２を再び加熱体２１に対して加圧圧接状態に復帰させ
、制御回路をリセットすれば′ｒｒＬ磁ソレノイドープ
ンンジャ６３に対する通電が断たれて風車６１から爪部
６２ｂが逃げ動作して、定着装置２０は再び定着処理可
能状ｊ６に復帰する。After clearing the jam, the push button 46 is released, the pressure roller 22 is brought back into pressure contact with the heating element 21, and the control circuit is reset to turn off the current to the 'rrL magnetic solenoid pump 63. When it is cut off, the claw portion 62b moves away from the windmill 61, and the fixing device 20 returns to the fixing process ready state j6 again.

上記のジャム処理手順においてオペレータは先ず押し釦
４６を押し操作して加圧ローラ２２の加熱体２１に対す
る加圧圧接を解除してジャム転写材を取り出し処置すべ
きところ、その加圧圧接解除操作を失念して加熱体２１
と加圧ローラ２２との間に挟み込み状態のジャム転写材
シートを無理に引張って加熱体２１と加圧ローラ２２と
の相互圧接力に抗して引抜き除去する場合もあり、この
場合はジャム転写材シートの引抜きに伴なう定着フィル
ム４０の引きずられ移動で定着フィルム４０にシワすじ
部の発生等のダメージを生じることになることは前述し
た通りである。In the above jam removal procedure, the operator first presses the push button 46 to release the pressure roller 22 from the heating body 21 and removes the jammed transfer material. I forgot, heating element 21
In some cases, the jammed transfer material sheet sandwiched between the heating element 21 and the pressure roller 22 may be pulled out and removed by forcefully pulling it out against the mutual pressing force between the heating element 21 and the pressure roller 22. In this case, the jammed transfer material sheet is removed. As described above, the fixing film 40 is dragged and moved as the material sheet is pulled out, causing damage such as wrinkles to the fixing film 40.

木実誰何の場合は加圧ローラ２２の加熱体２１に対する
加圧解除処置を失念して両部材間に挟圧されているジャ
ム転写材シートを無理に引張って引抜き除去しても、ロ
ーラ４２が風車６１に対するレバー爪部６２ｂの係合で
回転止めされている、つまり定着フィルム４０の回動移
動が阻止されているのでジャム転写材シートの引抜きに
伴なう定着フィルム４０の引きずられ移動は生ぜず、ジ
ャム転写材シートは移動阻止されている定着フィルム面
を滑りなから圧接部Ｎから引き抜かれる。従ってジャム
転写材シートの引抜きに伴なう定着フィルム４０の引き
ずられ移動で定着フィルム４０面に波打ちを生じその波
打ち面が加熱体２１と加圧ローラ２２との圧接部Ｎに進
んで加圧力で押しつぶされて定着フィルム４０面にシワ
すじ部を生じるような事態を生じることが防止される。In some cases, even if you forget to remove the pressure on the heating body 21 of the pressure roller 22 and forcefully pull out the jammed transfer material sheet that is sandwiched between the two members, the roller 42 Since the rotation of the fixing film 40 is stopped by the engagement of the lever claw portion 62b with the windmill 61, that is, the rotational movement of the fixing film 40 is prevented, the dragging movement of the fixing film 40 caused by pulling out the jammed transfer material sheet is prevented. The jammed transfer material sheet is pulled out from the pressure contact portion N without slipping on the surface of the fixing film whose movement is prevented. Therefore, as the fixing film 40 is dragged and moved as the jammed transfer material sheet is pulled out, the surface of the fixing film 40 is undulated, and the wavy surface advances to the pressure contact area N between the heating element 21 and the pressure roller 22, and is applied with the pressure. This prevents the occurrence of wrinkles on the surface of the fixing film 40 due to crushing.

〈実施例−２〉　（第４・５図） 本例は定着フィルム移動阻止手段６０の他の実施例を示
している。前述第２−３図例のものと共通する構成部材
・部分には同一の符号を付して再度の説明を省略する。<Example 2> (FIGS. 4 and 5) This example shows another example of the fixing film movement prevention means 60. Components and portions that are common to those in the example shown in FIGS. 2-3 are given the same reference numerals and repeated explanations will be omitted.

本例はローラ４２に対する回転負荷ａ４Ｉのばね押え５
５の外面に放射状にかみ合い用溝部５５ａを具備させ、
このばね押え５５の外面に対向させてｉ）０記かみ合い
用溝部５５ａに食い込む関係のかみ合い刃６４ａを放射
状に具備させた停止板６４をばね押え５５に対して進退
動自由に設け、この停止板６４を進退動させる電磁ソレ
ノイド−プランジャ６６をレバー６５を介して停止板６
４に連結しである。６５ａはレバー６５の回動中心軸で
あり、レバー６５の一方の腕と他方の腕を夫々停止板６
４の進退軸６４ｂと、電磁ソレノイド−プランジャ６６
の進退プランジャ６６ａにピン軸６５ｂ・６５ｃで連結
しである。In this example, the spring presser 5 has a rotational load a4I on the roller 42.
The outer surface of 5 is provided with radially engaging grooves 55a,
A stop plate 64 is provided facing the outer surface of the spring holder 55 and is provided with radially engaging blades 64a that bite into the engagement grooves 55a, and can freely move forward and backward with respect to the spring holder 55. An electromagnetic solenoid for moving the plunger 64 forward and backward is connected to the stop plate 6 via the lever 65.
It is connected to 4. Reference numeral 65a is a rotation center axis of the lever 65, and one arm and the other arm of the lever 65 are connected to the stop plate 6, respectively.
4 forward/backward axis 64b and electromagnetic solenoid plunger 66
It is connected to the reciprocating plunger 66a by pin shafts 65b and 65c.

常時は’ｉｕａソレノイド−プランジャ６６に対する通
電はオフであり、プランジャ６６ａは不図示の付勢部材
によりソレノイドから前方へ所定長さ突出しており、こ
れにより停止板６４がし八−６５を介して第５図の実線
示のようにばね押え５５の外面から退避してばね押え５
５とは縁が切れた状態になっている。Normally, the power to the 'iua solenoid-plunger 66 is off, and the plunger 66a projects a predetermined length forward from the solenoid by a biasing member (not shown). As shown by the solid line in Fig. 5, the spring presser 5 is removed from the outer surface of the spring presser 55
The relationship with 5 has been severed.

シートジャムの検出により装置が緊急停止されると、そ
の時点で′ｒｒＬ磁ソレメソレノイド−プランジャ６６
な・されてソレノイドの励磁によりプランジャ６６ａが
ソレノイドの内方へ引き込まれた状態に保持され、それ
に連動して停止板６４がレバー６５を介して第５図の２
点鎖線示のようにばね押え５５の外面に対して前進動じ
て停止板６４側のかみ合い歯６４ａがばね押え５５側の
かみ合い溝部５５ａに係合してローラ４２が回り止めさ
れた状態になる。When the device is brought to an emergency stop due to the detection of a sheet jam, at that point the 'rrL magnetic solenoid-plunger 66
The plunger 66a is held in a retracted state by the excitation of the solenoid, and in conjunction with this, the stop plate 64 is moved via the lever 65 to the position shown in FIG.
As shown by the dotted chain line, the roller 42 moves forward relative to the outer surface of the spring holder 55, and the engagement teeth 64a on the stop plate 64 side engage with the engagement groove 55a on the spring holder 55 side, so that the roller 42 is stopped from rotating.

ジャム処理は前述実施例−１と同様の要領でなされ、ジ
ャム処理後に制御回路をリセットすれば電磁ソレノイド
−プランジャ６６に対する通電が断たれて停止板６４が
ばね押え５５から逃げ動作して両者の縁が切れ、即ちロ
ーラ４２の回り止めが解除されて定着装Ｗ１２０は再び
定着処理可能状態に復帰する。Jam removal is carried out in the same manner as in Embodiment 1, and when the control circuit is reset after the jam removal, the power to the electromagnetic solenoid-plunger 66 is cut off, and the stop plate 64 escapes from the spring retainer 55, thereby removing the edge of both. is cut, that is, the rotation of the roller 42 is released, and the fixing device W120 returns to a state in which fixing processing is possible.

（その他〉 （１）圧力解除機構として例示のものは手動の押し釦と
レバー等の組合せ機構としたが、これに限らずその他例
えば、ジャム発生時に、ジャム転写材シートを排出する
排紙カバーを解除することによってリンク−カムで連動
させて加圧ローラの加熱体に対する圧接を解除させるよ
うな構成にすることもできる。(Others) (1) The pressure release mechanism illustrated is a combination of a manual push button and a lever, but the mechanism is not limited to this. By releasing the pressure roller, a link-cam may be used to release the pressure roller from being pressed against the heating body.

（２）加圧ローラの加熱体に対する圧接解除はジャム発
生時だけでなく、定着フィルムの交換時などその他必要
時に行なわせることができる。(2) The pressure roller can be released from the heating body not only when a jam occurs, but also when necessary, such as when replacing the fixing film.

（３）加熱体側を可動にして加圧ローラとの圧接な解除
する構成にしてもよい。(3) The heating body side may be movable to release the pressure contact with the pressure roller.

（４）定着フィルムはＰＦＡ樹脂やＰＩ樹脂を例示した
が、もちろんこれに限るものではなく、定着温度よりも
高い耐熱性を有し、摩擦係数が小さく、耐トナー性・寸
法安定性・強靭性等を有するものであれば他の各種の中
層・複合層構成の樹脂フィルム（又はシート）、樹脂以
外の材質のフィルム（又はシート）を使用できる。(4) The fixing film is exemplified by PFA resin or PI resin, but it is not limited to these, of course, and has heat resistance higher than the fixing temperature, low coefficient of friction, toner resistance, dimensional stability, and toughness. Various other resin films (or sheets) having intermediate layer/composite layer configurations and films (or sheets) made of materials other than resin can be used.

（５）定着フィルムは実施例のようなエンドレスタイプ
に限らず、送出し軸にロール巻に巻回した右端の帯状フ
ィルムを用い、これを加熱体と加圧部材との間を経由さ
せて巻取り軸側へ巻取り走行制御して定着処理に順次に
供し、送出し軸側の定着フィルムが巻取り軸側にほとん
ど全て巻取られて使用されたら新しいロール巻フィルム
と交換する方式にすることもできる（巻取り交換式）。(5) The fixing film is not limited to the endless type shown in the example, but may also be a belt-shaped film on the right end that is wound around the delivery shaft in a roll, and the film is wound by passing it between the heating body and the pressure member. To adopt a system in which the winding movement is controlled to the take-up shaft side and the film is sequentially subjected to fixing processing, and when almost all of the fixing film on the delivery shaft side is wound onto the take-up shaft side and used, it is replaced with a new roll film. (replaceable winding type).

このような巻取り交換式の場合は定着フィルムの耐久性
に関係なく薄肉化が可能となり、低電力化することがで
きる０例えば、定着フィルムとしてＰＥＴ　（ポリエス
テル）フィルムなどの安価な基材を用い、耐熱処理を施
した例えば１２．５ｕＬｍ程度又はそれ以下の薄肉のも
のを用いることができる。In the case of such a winding and replaceable type, it is possible to make the fixing film thinner regardless of its durability, and the power consumption can be reduced.For example, using an inexpensive base material such as PET (polyester) film as the fixing film For example, a thin wall of about 12.5 uLm or less, which has been subjected to heat-resistant treatment, can be used.

或は、定着フィルム面へのトナーオフセットは前述した
ように実質的に生じないので定着フィルムの使用に伴な
う熱変形や劣化が小さければ巻取り軸側へ巻取られた使
用済みのシートを適時に送出し軸側へ巻戻し制御して、
或は巻取り軸側と送出し軸側とを反転交換するなどして
複数回繰返して使用することもできる（巻戻し繰返し使
用式）。Alternatively, as mentioned above, toner offset to the fixing film surface does not substantially occur, so if the thermal deformation and deterioration caused by use of the fixing film are small, the used sheet wound up on the winding shaft side can be By controlling the rewinding to the delivery shaft side in a timely manner,
Alternatively, the winding shaft side and the sending shaft side may be reversed and exchanged to be used multiple times (repeated rewinding type).

巻戻し繰返し使用式では定着フィルムとしては例えば耐
熱性争機械的強度等に優れた基材として２５ｇｍ厚のポ
リイミド樹脂フィルムを用いてその面に離型性の高いフ
ッ素樹脂等によりなる離型層を設けた複合層フィルムを
用いることができ、巻戻し逆走０時は圧力解除機構を自
動制御させて加熱体と加圧ローラとの当接圧を解除状態
に保持させるのがよい。In the rewinding and repeated use type, the fixing film is a 25 gm thick polyimide resin film as a base material with excellent heat resistance and mechanical strength, and a release layer made of a fluororesin or the like with high mold release properties is provided on the surface. It is preferable to automatically control the pressure release mechanism to maintain the contact pressure between the heating body and the pressure roller in a released state when the rewinding and reverse running is zero.

巻取り交換式・巻戻し繰返し使用式の何れの場合もジャ
ム発生時には本発明のように定着フィルムの移動を阻止
する手段をＡ＠させることにより前述の問題を除去する
ことができる。In both cases of the rewinding type and the rewinding and repeating type, when a jam occurs, the above-mentioned problem can be eliminated by providing means for preventing the fixing film from moving as in the present invention.

巻戻し繰返し使用式やエンドレスベルト型のように複数
回使用する場合は、フィルム面クリーニング用のフェル
トパッドを設けると共に若干の藻型剤、例えばシリコン
オイルを含浸させて該パッドをフィルム面に当接させる
などしてフィルム面のクリーニングと離型性の更なる向
上を行なうようにしてもよい、定着フィルムが絶縁性の
ツー２、Ｖ樹脂処理品の場合などではトナー画像を撹乱
する静ｉｔ気がフィルムに発生し易いので、その対処の
ために接地した除電ブラシで除電処置するのもよい、接
地せずにブラシに１＜イアスミ圧を印加してトナー画像
を撹乱しない範囲でフィルムを帯電させても良い、さら
にフッ素樹脂に導電性の粉体繊維、例えばカーボンブラ
ック等を添加して、上述の静電気による画像孔れを防止
するもの一策である、また、加圧ローラの除帯電及び導
電化に関しても同様の手段により行なうことができる。When using multiple times, such as a rewinding type or an endless belt type, a felt pad is provided for cleaning the film surface, and the pad is impregnated with a small amount of algae type agent, such as silicone oil, and the pad is brought into contact with the film surface. If the fixing film is treated with insulating 2 or V resin, the static air that disturbs the toner image may be removed. Since this is likely to occur on the film, it is a good idea to use a grounded static eliminator brush to eliminate the static electricity, or charge the film within a range that does not disturb the toner image by applying 1<Iasumi pressure to the brush without grounding it. Furthermore, it is possible to add conductive powder fibers, such as carbon black, to the fluororesin to prevent the above-mentioned image holes caused by static electricity.Also, it is possible to remove static electricity from the pressure roller and make it conductive. This can also be done by similar means.

また、帯電防止剤等の塗布や、添加を行なっても良い。Further, an antistatic agent or the like may be applied or added.

定Ｍｙイルムはエンドレスベルト式、巻取り交換式、巻
戻し繰返し使用式の何れにしても足前装置２０の所定部
所に着脱自在のカートリッジ構成にすることにより定着
フィルムの交換等を容易化することができる。Regardless of whether the fixing film is an endless belt type, a rewinding type, or a rewinding/repeating type, the fixing film can be easily replaced by having a cartridge structure that can be attached to and removed from a predetermined part of the front device 20. be able to.

（６）加熱体２１の構成及び発熱体２８への通電制御は
実施例のものに限定されない、加熱体２１は熱ローラ型
であってもよいし、発熱体は厚膜の抵抗体やＰＴＣ特性
を有するセラミック製チップ・アレイなどであっちよく
、通電制御もパルス状に与えるものではなく通常通電で
あってもよい。(6) The configuration of the heating element 21 and the control of energization to the heating element 28 are not limited to those in the embodiment. The heating element 21 may be of a heat roller type, or the heating element may be a thick film resistor or PTC characteristic. A ceramic chip array or the like may be used, and the energization control may be a normal energization rather than a pulsed one.

以北実施例装置は転写式の電子写真複写装置であるが、
画像形成のプロセス・手段はエレクトロファックス紙・
静電記録紙等に直接にトナー画像を形成担持させる直接
式や、磁気記録画像形成式、その他適宜の画像形成プロ
セス舎手段で記録材上に加熱溶融性トナーによる画像を
形成し、それを加熱定着する方式の複写機・レーザビー
ムプリンタ・ファクシミリ・ヤイクロフィルムリーグプ
リンタ・デイスプレィ装置・記録機等の各種の画像形成
装置に本発明は有効に適用できるものである。The apparatus of the above embodiments is a transfer type electrophotographic copying apparatus,
The image forming process/means is electrofax paper/
An image is formed using heat-fusible toner on a recording material using a direct method in which a toner image is directly formed and carried on electrostatic recording paper, a magnetic recording image forming method, or other appropriate image forming process means, and then heated. The present invention can be effectively applied to various image forming apparatuses such as fixing type copying machines, laser beam printers, facsimile machines, microfilm league printers, display devices, and recording machines.

（発明の効果） 以上のように本発明はトナー画像加熱定着式の画像形成
装置について、定着不良やオフセットを生じさせること
なく加熱手段である加熱体の熱容漬を小さくすることが
可詣で、その結果、待機時間や消費電力、さらには機内
昇温の小さい画像形成装置を実現できる。又定着フィル
ムは薄肉のものをシワ発生の問題なく支障なく長期にわ
たって繰り返して使用することができる。(Effects of the Invention) As described above, the present invention makes it possible to reduce the heat immersion of the heating body, which is the heating means, without causing fixation failure or offset in a toner image heat fixing type image forming apparatus. As a result, an image forming apparatus with low standby time, low power consumption, and low internal temperature rise can be realized. Furthermore, the thin fixing film can be used repeatedly over a long period of time without any problem of wrinkles.

シート（記録材）ジャム発生時は定着フィルムの移動を
阻止する手段を設けであるから、シートジャム発生時に
装行使用者ガ加熱体と加圧部材との間に定着フィルムと
共に挟み込まれているジャムシートの除去処理するとき
加熱体と加圧部材との相互圧接を解除処置しないままジ
ャムシートを無理に引き抜いても定着フィルムは随動移
動せず、定着フィルムにしわや彼れを生じさせるおそれ
が除去される。Since a means is provided to prevent the fixing film from moving when a sheet (recording material) jam occurs, the user can prevent the jam from being caught between the heating body and the pressure member together with the fixing film when a sheet jam occurs. When removing the sheet, even if the jammed sheet is forcibly pulled out without releasing the mutual pressure between the heating element and the pressure member, the fixing film will not move and may cause wrinkles or curls in the fixing film. removed.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は一実施例装置の構成略図、第２図は定着装置部
分の拡大図、第３図はローラに対する回転負荷機構部分
の断面図、第４図は第２の実施例装置の要部の部分図、
第５図はその回転負荷機構と定着フィルム移動阻止機構
部分の断面図である。 ２０は定着フィルムの全体符号、４０は定着フィルム、
２１は加熱体、２２は加圧ローラ、４４は加圧レバー、
４６は加圧解除用押し釦、６０は定着フィルム移動阻止
機構、ＦＢＩＰＨ２は給紙及び排紙検知センサ。 第　５　図 茅　４　図 特許出願人　　キャノン株式会社Fig. 1 is a schematic diagram of the configuration of the device of one embodiment, Fig. 2 is an enlarged view of the fixing device portion, Fig. 3 is a sectional view of the rotational load mechanism portion for the roller, and Fig. 4 is the main part of the device of the second embodiment. A partial diagram of
FIG. 5 is a sectional view of the rotational load mechanism and the fixing film movement prevention mechanism. 20 is the overall code of the fixing film, 40 is the fixing film,
21 is a heating element, 22 is a pressure roller, 44 is a pressure lever,
46 is a push button for releasing pressure, 60 is a fixing film movement prevention mechanism, and FBIPH2 is a paper feed and paper ejection detection sensor. Figure 5 Kaya Figure 4 Patent Applicant: Canon Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] （１）記録材面に加熱溶融性の樹脂等より成るトナーを
担持させて目的の画像情報に対応した未定着のトナー画
像を形成する画像形成手段と、定着フィルムと、該定着
フィルムの走行駆動手段と、該定着フィルムを中にして
その一方面側に配置された加熱体と、他面側に配置され
、前記加熱体に対して該定着フィルムを介して記録材の
未定着トナー画像担持側の面を密着させる加圧部材を備
え、前記画像形成手段側から搬送されてくる未定着トナ
ー画像を担持した記録材の搬送速度と同一速度で同一方
向に走行駆動させた定着フィルムと前記加圧部材との間
に該記録材を導入して未定着トナー画像を記録材面に加
熱定着するトナー画像加熱定着手段と、 装置の記録材搬送経路を搬送される記録材のジャム発生
を検知するジャム検知手段と、 該ジャム検知手段のジャム検知信号にもとずいて装置作
動の緊急停止がなされることにより走行停止の状態にな
った定着ファルムに対して引張り外力が作用しても該引
張り外力に抗して定着フィルムの移動を阻止する手段と
、 を有することを特徴とする画像形成装置。(1) An image forming means that forms an unfixed toner image corresponding to target image information by carrying toner made of heat-meltable resin or the like on the surface of a recording material, a fixing film, and a driving drive for the fixing film. means, a heating body disposed on one side of the fixing film, and a heating body disposed on the other side of the recording material, the unfixed toner image bearing side of the recording material being connected to the heating body through the fixing film; The fixing film is provided with a pressure member that brings the surfaces of the image into close contact with each other, and is driven to run in the same direction at the same speed as the conveyance speed of the recording material carrying the unfixed toner image conveyed from the image forming means side, and the pressurizing film. a toner image heat fixing unit that introduces the recording material between the recording member and the recording member and heats and fixes the unfixed toner image on the surface of the recording material; and a jam unit that detects the occurrence of a jam in the recording material conveyed through the recording material conveyance path of the apparatus. Even if a tensile external force is applied to the detecting means and the fixing film that has come to a traveling stop state due to an emergency stop of the device operation based on a jam detection signal of the jam detecting means, the tensile external force is not applied. An image forming apparatus comprising: means for resisting movement of the fixing film.