JPH10274900A - Fixing device - Google Patents

Fixing device

Info

Publication number
JPH10274900A
JPH10274900A JP9526397A JP9526397A JPH10274900A JP H10274900 A JPH10274900 A JP H10274900A JP 9526397 A JP9526397 A JP 9526397A JP 9526397 A JP9526397 A JP 9526397A JP H10274900 A JPH10274900 A JP H10274900A
Authority
JP
Japan
Prior art keywords
roller
driving
force
urging
drive
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.)
Pending
Application number
JP9526397A
Other languages
Japanese (ja)
Inventor
Kazuto Kishi
和人 岸
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP9526397A priority Critical patent/JPH10274900A/en
Publication of JPH10274900A publication Critical patent/JPH10274900A/en
Pending legal-status Critical Current

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  • Fixing For Electrophotography (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a fixing device being excellent in fixability by allowing a driving roller to uniformly press-contact with a driven roller, in an axial direction, at the time of driving the driving roller, so as to prevent the occurrence of paper wrinkles. SOLUTION: In a fixing part 21, a pressure roller 24 is brought into press-contact with a heating roller 23 by energizing members 26a and 26b in both end parts of the pressure roller 24 and the energizing force of the energizing member 26a on the side of a rotation transmission gear 25 is set smaller than that of the energizing member 26b on the opposite side. When the pressure roller 24 is not rotationally driven by a driving gear 27, the width of the press-contact part of the pressure roller 24 with the heating roller 23 on the side of the rotation transmission gear 25 is narrower than that on the opposite side, that is, ununiform. When the pressure roller 24 is rotationally driven, the end part on the side of the gear 25, of the pressure roller 24 is brought into press-contact with the heating roller 23 by press-contact force obtained by adding the energizing force of the energizing member 26a and pressing force by the driving gear 27, so that the width of the press-contact part of the pressure roller 24 with the heating roller 23 is made uniform in the axial direction and toner can be fixed on a recording paper with excellent fixability, without generating wrinkles in the recording paper.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、定着装置に関し、
詳細には、駆動ローラと従動ローラが圧接され加熱回転
することによりトナー画像の付着された記録紙にトナー
画像を定着させ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,
More specifically, the present invention relates to a fixing device that fixes a toner image on a recording sheet on which a toner image is adhered by pressing and rotating a driven roller and a driven roller while heating.

【０００２】[0002]

【従来の技術】従来、電子写真式記録装置においては、
加熱ローラに加圧ローラを圧接し、当該加熱ローラと加
圧ローラの圧接部に、未定着トナー画像の付着された記
録紙を通過させて、トナーを加熱溶融することで、トナ
ー画像を記録紙に定着させる加熱ローラ定着方式が一般
に使用されている。2. Description of the Related Art Conventionally, in an electrophotographic recording apparatus,
A pressure roller is pressed against the heating roller, and the recording paper with the unfixed toner image adhered to the pressure contact portion between the heating roller and the pressure roller, and the toner is heated and melted to form a toner image on the recording paper. A fixing method using a heat roller for fixing the toner image on the sheet is generally used.

【０００３】この加熱ローラ定着方式は、加熱ローラと
加圧ローラの相互圧接部が通紙領域全体にわたって均一
な圧接力で加圧されていることが望ましく、圧接力が不
均一になると、紙シワが発生したり、定着性が悪化す
る。In this heating roller fixing method, it is desirable that the mutual pressing portion of the heating roller and the pressing roller is pressed with a uniform pressing force over the entire sheet passing area. Occurs and the fixability deteriorates.

【０００４】そこで、従来においても、この相互圧接部
の圧接力を均一にする技術が提案されている。例えば、
特開平５−２４１４６６号公報記載のトナー像の定着装
置及び方法や特開平５−２３２８３１号公報記載の定着
装置は、加圧ローラの押圧力により加熱ローラが湾曲し
て、加圧ローラと加熱ローラとの密着性が軸方向中央部
で低下することを防ぐために、加熱ローラの中央部を加
圧ローラ方向に押圧する押圧部材、例えば、バックアッ
プロールを配設し、加圧ローラと加熱ローラの湾曲を防
いでいる。Therefore, a technique has been proposed in the past to make the pressing force of the mutual pressing portions uniform. For example,
In the fixing device and method for fixing a toner image described in JP-A-5-241466 and the fixing device described in JP-A-5-232831, the heating roller is curved by the pressing force of the pressing roller, and the pressing roller and the heating roller are heated. In order to prevent the adhesion between the heating roller and the central portion in the axial direction from decreasing, a pressing member for pressing the central portion of the heating roller in the direction of the pressing roller, for example, a backup roll is provided, and the bending of the pressing roller and the heating roller is performed. Is preventing.

【０００５】また、従来、加熱ローラ定着方式において
は、回転駆動力の付与される方のローラの片上がりによ
る加熱ローラと加圧ローラの圧接力の不均一が問題とな
っている。Conventionally, in the heating roller fixing method, there is a problem that the pressure contact force between the heating roller and the pressing roller is not uniform due to the upward movement of the roller to which the rotational driving force is applied.

【０００６】すなわち、加熱ローラ定着方式は、一般
に、図１０に示すように、図示しないヒーターにより所
定の定着温度に加熱される加熱ローラ１を回転自在に配
設し、加圧ローラ２を回転自在に配設するとともに、加
熱ローラ１の方向（圧接方向）に移動可能に配設してい
る。加圧ローラ２のローラ軸３の一方側の端部には、回
転伝達歯車４が取り付けられており、回転伝達歯車４に
は、図示しない駆動モータにより回転駆動される駆動歯
車５が歯合している。加圧ローラ２は、そのローラ軸３
を介してバネ６ａ、６ｂにより加熱ローラ１方向に付勢
されて、加熱ローラ１に所定の圧力で圧接されており、
図１１及び図１２に示すように、この加熱ローラ１と加
圧ローラ２との相互圧接部Ｌは、加圧ローラ２が回転駆
動されていないとき（停止時）において、加熱ローラ１
及び加圧ローラ２の軸方向において均一な圧接面積を有
している。すなわち、図１２に示すように、加圧ローラ
２の回転伝達歯車４側の加熱ローラ１との圧接幅Ｌａと
回転伝達歯車４と反対側の加熱ローラ１との圧接幅Ｌｂ
とで同じ圧接幅（Ｌａ＝Ｌｂ）を有している。これは、
加圧ローラ２を加熱ローラ１方向に付勢するバネ６ａと
バネ６ｂが同じ付勢力のものが使用されているためであ
る。そして、この加熱ローラ１と加圧ローラ２の圧接部
Ｌにトナー画像の付着された記録紙が搬送されてくる
と、駆動歯車５により回転伝達歯車４を介して加圧ロー
ラ２を回転駆動させるとともに、加熱ローラ１を従動回
転させ、記録紙を搬送しつつ、加熱ローラ１の熱により
記録紙上のトナーを溶融して、記録紙に定着させる。That is, in the heating roller fixing system, generally, as shown in FIG. 10, a heating roller 1 which is heated to a predetermined fixing temperature by a heater (not shown) is rotatably disposed, and a pressure roller 2 is rotatable. And movably arranged in the direction of the heating roller 1 (pressing direction). A rotation transmission gear 4 is attached to one end of the roller shaft 3 of the pressure roller 2, and the rotation transmission gear 4 meshes with a drive gear 5 that is driven to rotate by a drive motor (not shown). ing. The pressure roller 2 has a roller shaft 3
Are urged in the direction of the heating roller 1 by the springs 6a and 6b via the
As shown in FIGS. 11 and 12, the mutual pressing portion L between the heating roller 1 and the pressing roller 2 is connected to the heating roller 1 when the pressing roller 2 is not driven to rotate (when stopped).
And a uniform pressure contact area in the axial direction of the pressure roller 2. That is, as shown in FIG. 12, the pressure contact width La of the pressure roller 2 with the heating roller 1 on the side of the rotation transmission gear 4 and the pressure contact width Lb of the pressure roller 2 with the heating roller 1 on the side opposite to the rotation transmission gear 4.
Have the same pressure contact width (La = Lb). this is,
This is because the springs 6a and 6b for urging the pressure roller 2 in the direction of the heating roller 1 have the same urging force. Then, when the recording paper having the toner image attached thereto is conveyed to the pressure contact portion L between the heating roller 1 and the pressure roller 2, the driving roller 5 drives the pressure roller 2 to rotate via the rotation transmission gear 4. At the same time, the heating roller 1 is driven to rotate, and while the recording paper is being conveyed, the toner on the recording paper is melted by the heat of the heating roller 1 and fixed on the recording paper.

【０００７】ところが、駆動時には、駆動モータにより
回転駆動される駆動歯車５により、加圧ローラ２のロー
ラ軸３の端部に固定された回転伝達歯車４を回転させ
て、加圧ローラ２を回転駆動するとともに、加圧ローラ
２の回転に従動させて加熱ローラ１を回転させるため、
回転伝達歯車４には、駆動歯車５の回転方向に応じて、
図１３あるいは図１４に示すように、駆動歯車５と回転
伝達歯車４との噛み合いにより、回転伝達歯車４に、加
熱ローラ１と反対方向の離脱力Ｆｔａあるいは加熱ロー
ラ１方向の押圧力Ｆｔｂが作用する。However, at the time of driving, a rotation transmission gear 4 fixed to an end portion of the roller shaft 3 of the pressure roller 2 is rotated by a driving gear 5 rotated by a driving motor to rotate the pressure roller 2. In order to drive and rotate the heating roller 1 by following the rotation of the pressure roller 2,
According to the rotation direction of the drive gear 5,
As shown in FIG. 13 or FIG. 14, a separation force Fta in the opposite direction to the heating roller 1 or a pressing force Ftb in the direction of the heating roller 1 acts on the rotation transmission gear 4 due to the engagement between the drive gear 5 and the rotation transmission gear 4. I do.

【０００８】したがって、図１３に示すように、駆動歯
車５が回転伝達歯車４に作用する力が、回転伝達歯車４
側のローラ軸３に作用するバネ６ａの付勢力Ｆｓの向き
と逆の向きである離脱力Ｆｔａであるときには、バネ６
ａによる加圧ローラ２の加熱ローラ１への付勢力Ｆｓが
離脱力Ｆｔａにより弱められ、図１５に示すように、加
圧ローラ２の回転伝達歯車４側の加熱ローラ１との圧接
幅Ｌａ’が狭くなって、圧接幅Ｌａ’と回転伝達歯車４
と反対側の加熱ローラ１との圧接幅Ｌｂ’とが異なった
圧接幅となる。その結果、加熱ローラ１と加圧ローラ２
との間に搬送されてくる記録紙に紙シワが発生したり、
定着性が悪化する。Therefore, as shown in FIG. 13, the force that the drive gear 5 acts on the rotation transmission gear 4 is applied to the rotation transmission gear 4.
When the release force Fta is opposite to the direction of the urging force Fs of the spring 6a acting on the roller shaft 3 on the
a, the urging force Fs of the pressure roller 2 to the heating roller 1 is weakened by the detachment force Fta, and as shown in FIG. 15, the pressure contact width La ′ of the rotation roller 4 of the pressure roller 2 with the heating roller 1. Becomes narrower, the pressing width La ′ and the rotation transmission gear 4
Is different from the pressing width Lb ′ with the heating roller 1 on the opposite side. As a result, the heating roller 1 and the pressure roller 2
Paper wrinkles may occur on the recording paper transported between
Fixability deteriorates.

【０００９】また、図１４に示すように、駆動歯車５が
回転伝達歯車４に作用する力が、回転伝達歯車４側のロ
ーラ軸３に作用するバネ６ａの付勢力Ｆｓの向きと同じ
方向のときには、バネ６ａによる加圧ローラ２の加熱ロ
ーラ１への付勢力Ｆｓが押圧力Ｆｔｂにより強められ、
図１５に示した場合とは逆に、加圧ローラ２の回転伝達
歯車４側の加熱ローラ１との圧接幅Ｌａ’と回転伝達歯
車４と反対側の加熱ローラ１との圧接幅Ｌｂ’とが異な
った圧接幅となる。その結果、上記同様に、加熱ローラ
１と加圧ローラ２との間に搬送されてくる記録紙に紙シ
ワが発生したり、定着性が悪化する。Further, as shown in FIG. 14, the force of the drive gear 5 acting on the rotation transmitting gear 4 is the same as the direction of the urging force Fs of the spring 6a acting on the roller shaft 3 on the rotation transmitting gear 4 side. Sometimes, the urging force Fs of the pressure roller 2 to the heating roller 1 by the spring 6a is strengthened by the pressing force Ftb,
Contrary to the case shown in FIG. 15, the pressure contact width La ′ of the pressure roller 2 with the heating roller 1 on the side of the rotation transmission gear 4 and the pressure contact width Lb ′ of the pressure roller 2 with the heating roller 1 on the side opposite to the rotation transmission gear 4. Have different pressing widths. As a result, similarly to the above, paper wrinkles are generated on the recording paper conveyed between the heating roller 1 and the pressure roller 2, and the fixing property is deteriorated.

【００１０】そこで、本出願人は、駆動力によるローラ
の片上がりを防止するために、特開平５−２９７７５５
号公報に記載された電子写真装置の定着器を先に出願し
ている。この電子写真装置の定着器は、長手方向の両端
部で駆動力を伝達することにより、駆動力をローラに付
与する際のローラの片上がりを防止している。In order to prevent the roller from moving up due to the driving force, the present applicant has disclosed Japanese Patent Application Laid-Open No. 5-297755.
Has previously filed an application for a fixing device of an electrophotographic apparatus. The fixing device of the electrophotographic apparatus transmits the driving force at both ends in the longitudinal direction, thereby preventing the roller from rising when applying the driving force to the roller.

【００１１】[0011]

【発明が解決しようとする課題】しかしながら、このよ
うな従来の定着装置にあっては、別の部材、例えば、バ
ックアップロールで加熱ローラを押圧したり、ローラの
両端を駆動部で回転駆動するようになっていたため、部
品点数が増加し、コストが高くつくため、なお、改良の
余地があった。However, in such a conventional fixing device, the heating roller is pressed by another member, for example, a backup roller, or both ends of the roller are driven to rotate by a driving unit. Therefore, the number of parts increases and the cost increases, so there is still room for improvement.

【００１２】そこで、請求項１記載の発明は、駆動力伝
達機構により駆動ローラを回転して、付勢手段により従
動ローラ方向に付勢されている駆動ローラと従動ローラ
との間に搬送されてくるトナー画像の付着された記録紙
を搬送しつつ加熱してトナー画像を記録紙に定着させる
定着装置の駆動力伝達機構が、駆動ローラに回転駆動力
を付与していない状態で、付勢手段が駆動ローラを当該
駆動ローラの長手方向において不均一な付勢力で従動ロ
ーラ方向に付勢することにより、部品点数を増やすこと
なく、かつ、簡単な構成で、駆動力伝達機構が回転駆動
力を駆動ローラに付与したとき、付勢手段による付勢力
と当該回転駆動力が駆動ローラに作用する従動ローラ方
向あるいは従動ローラと反対方向の力とにより、駆動ロ
ーラが従動ローラに圧接される圧接力が駆動ローラの軸
方向（長手方向）で均一となるようにして、駆動ローラ
と従動ローラを長手方向において均一な相互圧接幅で圧
接させ、記録紙に紙シワが発生することを防止するとと
もに、定着性を向上させることのできる安価な定着装置
を提供することを目的としている。According to the first aspect of the present invention, the driving roller is rotated by the driving force transmitting mechanism, and is conveyed between the driving roller and the driven roller which are urged in the driven roller direction by the urging means. The driving force transmission mechanism of the fixing device that heats the recording paper to which the toner image is attached while conveying the recording paper to fix the toner image on the recording paper is applied to the driving roller without applying a rotational driving force to the driving roller. Urges the driving roller in the driven roller direction with an uneven urging force in the longitudinal direction of the driving roller, so that the driving force transmission mechanism reduces the rotational driving force without increasing the number of parts and with a simple configuration. When applied to the driving roller, the driving roller is driven by the urging force of the urging means and the force in the direction of the driven roller or in the direction opposite to the driven roller, the rotational driving force acting on the driving roller. The driving roller and the driven roller are pressed against each other with a uniform mutual pressing width in the longitudinal direction so that the pressing force to be pressed is uniform in the axial direction (longitudinal direction) of the driving roller, and paper wrinkles are generated on the recording paper. It is an object of the present invention to provide an inexpensive fixing device that can prevent the occurrence of the problem and improve the fixing property.

【００１３】請求項２記載の発明は、付勢手段が、駆動
力伝達機構が駆動ローラに回転駆動力を付与していない
状態で、駆動ローラの駆動力伝達機構側の端部を、駆動
ローラの駆動力伝達機構と反対側の端部よりも小さい付
勢力で付勢することにより、駆動力伝達機構が回転駆動
力を駆動ローラに付与したとき、駆動ローラが従動ロー
ラに圧接される圧接力を軽減しつつ、付勢手段による付
勢力と当該回転駆動力が駆動ローラに作用する従動ロー
ラ方向の力とにより、駆動ローラが従動ローラに圧接さ
れる圧接力が駆動ローラの軸方向（長手方向）で均一と
なるようにして、駆動ローラと従動ローラを長手方向に
おいて均一な相互圧接幅で圧接させ、記録紙に紙シワが
発生することを防止して定着性を向上させることができ
るとともに、駆動ローラ及び従動ローラの耐久性を向上
させることのできる安価な定着装置を提供することを目
的としている。According to a second aspect of the present invention, in the state where the driving force transmitting mechanism does not apply the rotational driving force to the driving roller, the urging means moves the end of the driving roller on the driving force transmitting mechanism side to the driving roller. When the driving force transmission mechanism applies a rotational driving force to the driving roller by urging with a smaller urging force than the end on the side opposite to the driving force transmission mechanism, the pressing force at which the driving roller is pressed against the driven roller The pressing force by which the driving roller is pressed against the driven roller is reduced by the urging force of the urging means and the force in the driven roller direction in which the rotational driving force acts on the driving roller while reducing the axial direction (longitudinal direction) of the driving roller. ), The driving roller and the driven roller are pressed against each other with a uniform mutual pressing width in the longitudinal direction, thereby preventing paper wrinkles from occurring on the recording paper and improving the fixing property. Drive And its object is to provide an inexpensive fixing device capable of improving the durability of over La and the driven roller.

【００１４】請求項３記載の発明は、付勢手段として、
少なくとも、駆動ローラの駆動力伝達機構側の端部に配
設されて駆動ローラを従動ローラ方向に付勢する駆動側
バネと、駆動ローラの駆動力伝達機構と反対側の端部に
配設されて駆動ローラを従動ローラ方向に付勢する非駆
動側バネと、を備え、駆動側バネと非駆動側バネとでバ
ネ種類の異なるバネを使用することにより、より一層簡
単な構造で、かつ、安価に、記録紙に紙シワが発生する
ことを防止するとともに、定着性を向上させることので
きる定着装置を提供することを目的としている。According to a third aspect of the present invention, as the urging means,
At least a drive-side spring that is provided at an end of the drive roller on the side of the drive force transmission mechanism and biases the drive roller in the driven roller direction, and is provided at an end of the drive roller opposite to the drive force transmission mechanism. A non-drive-side spring that urges the drive roller in the driven roller direction by using different types of springs for the drive-side spring and the non-drive-side spring, with a simpler structure, and It is an object of the present invention to provide an inexpensive fixing device that can prevent paper wrinkles from occurring on recording paper and can improve fixing performance.

【００１５】請求項４記載の発明は、付勢手段を、所定
の支点を中心として回動可能に配設され駆動ローラを所
定の作用点で支持するテコ部材と、テコ部材の所定の力
点に係合してテコ部材の作用点に支持されている駆動ロ
ーラを従動ローラ方向に付勢する付勢部材と、を備えた
テコ式付勢機構が、駆動ローラの駆動力伝達機構側の端
部と駆動力伝達機構と反対側の端部にそれぞれ設けられ
たものとすることにより、簡単な構造で、かつ、安価
に、記録紙に紙シワが発生することを防止するととも
に、定着性を向上させることのできる定着装置を提供す
ることを目的としている。According to a fourth aspect of the present invention, there is provided a lever member provided rotatably around a predetermined fulcrum and supporting a driving roller at a predetermined point of action, and a predetermined force point of the lever member. And a biasing member for biasing the drive roller supported at the point of action of the lever member in the driven roller direction, the lever type biasing mechanism having an end portion on the drive force transmission mechanism side of the drive roller. And at the end opposite to the driving force transmission mechanism, to prevent paper wrinkles from occurring on the recording paper with a simple structure and at a low cost, and to improve fixability. It is an object of the present invention to provide a fixing device that can perform the fixing.

【００１６】請求項５記載の発明は、駆動力伝達機構側
のテコ式付勢機構の付勢部材と駆動力伝達機構と反対側
のテコ式付勢機構の付勢部材として、同じ種類の付勢部
材を使用し、テコ部材の異なる力点位置に係合させるこ
とにより、付勢部材を共通化して、部品種類を減らし、
より一層安価に記録紙に紙シワが発生することを防止す
るとともに、定着性を向上させることのできる定着装置
を提供することを目的としている。According to a fifth aspect of the present invention, the same type of urging member of the lever-type urging mechanism on the side of the driving force transmitting mechanism and the lever-type urging mechanism on the side opposite to the driving force transmitting mechanism is used. By using the urging member and engaging the lever members at different force points, the urging member can be used in common, reducing the number of component types.
It is an object of the present invention to provide a fixing device capable of preventing paper wrinkles from occurring on recording paper at a lower cost and improving the fixing property.

【００１７】[0017]

【課題を解決するための手段】請求項１記載の発明の定
着装置は、回転可能に支持された従動ローラと、前記従
動ローラ方向に移動可能にかつ回転可能に支持された駆
動ローラと、前記駆動ローラを前記従動ローラ方向に付
勢して前記駆動ローラを前記従動ローラに圧接させる付
勢手段と、前記駆動ローラの長手方向一方側の端部に係
合して前記駆動ローラに所定の回転駆動力を付与して前
記駆動ローラを回転駆動する駆動力伝達機構と、を有
し、前記従動ローラと前記駆動ローラのうち少なくとも
一方のローラが加熱されて、前記駆動力伝達機構により
前記駆動ローラが回転され、前記従動ローラと前記駆動
ローラの間に搬送されてくるトナー画像の付着された記
録紙を前記従動ローラと前記駆動ローラで狭持して搬送
しつつ加熱して前記トナー画像を前記記録紙に定着させ
る定着装置であって、前記付勢手段は、前記駆動力伝達
機構が前記駆動ローラに前記回転駆動力を付与していな
い状態で、前記駆動ローラを当該駆動ローラの長手方向
において不均一な付勢力で前記従動ローラ方向に付勢す
ることにより、上記目的を達成している。According to a first aspect of the present invention, there is provided a fixing device comprising: a driven roller rotatably supported; a driving roller movably and rotatably supported in a direction of the driven roller; Urging means for urging the drive roller in the direction of the driven roller to press the drive roller against the driven roller; and engaging the drive roller at one end in the longitudinal direction with a predetermined rotation of the drive roller. A driving force transmission mechanism for applying a driving force to rotate the driving roller, wherein at least one of the driven roller and the driving roller is heated, and the driving roller is driven by the driving force transmission mechanism. Is rotated, and the recording paper with the toner image conveyed between the driven roller and the driving roller is heated while being nipped and conveyed by the driven roller and the driving roller. A fixing device for fixing the toner image to the recording paper, wherein the urging unit is configured to drive the driving roller to the driving roller in a state where the driving force transmission mechanism does not apply the rotational driving force to the driving roller. The above-mentioned object is achieved by urging in the direction of the driven roller with a non-uniform urging force in the longitudinal direction.

【００１８】上記構成によれば、駆動力伝達機構により
駆動ローラを回転して、付勢手段により従動ローラ方向
に付勢されている駆動ローラと従動ローラとの間に搬送
されてくるトナー画像の付着された記録紙を搬送しつつ
加熱してトナー画像を記録紙に定着させる定着装置の駆
動力伝達機構が、駆動ローラに回転駆動力を付与してい
ない状態で、付勢手段が駆動ローラを当該駆動ローラの
長手方向において不均一な付勢力で従動ローラ方向に付
勢しているので、部品点数を増やすことなく、かつ、簡
単な構成で、駆動力伝達機構が回転駆動力を駆動ローラ
に付与したとき、付勢手段による付勢力と当該回転駆動
力が駆動ローラに作用する従動ローラ方向あるいは従動
ローラと反対方向の力とにより、駆動ローラが従動ロー
ラに圧接される圧接力を駆動ローラの軸方向（長手方
向）で均一にすることができ、駆動ローラと従動ローラ
の長手方向における相互圧接幅を均一にすることができ
る。その結果、簡単な構成で、かつ、安価に、記録紙に
紙シワが発生することを防止することができるととも
に、定着性を向上させることができる。According to the above construction, the driving roller is rotated by the driving force transmitting mechanism, and the toner image conveyed between the driving roller and the driven roller which is urged in the driven roller direction by the urging means is formed. When the driving force transmission mechanism of the fixing device that heats the attached recording paper while heating it to fix the toner image on the recording paper is not applying a rotational driving force to the driving roller, the urging means moves the driving roller. Since the drive roller is urged in the driven roller direction with an uneven urging force in the longitudinal direction of the drive roller, the driving force transmission mechanism applies the rotational drive force to the drive roller without increasing the number of parts and with a simple configuration. When the driving roller is applied, the pressure at which the driving roller is pressed against the driven roller is generated by the urging force of the urging means and the force of the rotation driving force acting on the driving roller in the driven roller direction or in the direction opposite to the driven roller. Which makes uniform the force in the axial direction of the drive roller (longitudinal direction), the mutual pressure contact width in the longitudinal direction of the driving roller and the driven roller can be made uniform. As a result, it is possible to prevent the occurrence of paper wrinkles on the recording paper with a simple configuration and at a low cost, and to improve the fixability.

【００１９】この場合、例えば、請求項２に記載するよ
うに、前記付勢手段は、前記駆動力伝達機構が前記駆動
ローラに前記回転駆動力を付与していない状態で、前記
駆動ローラの前記駆動力伝達機構側の端部を、前記駆動
ローラの前記駆動力伝達機構と反対側の端部よりも小さ
い付勢力で前記駆動ローラを付勢するものであってもよ
い。In this case, for example, as set forth in claim 2, the urging means is configured to control the drive roller to rotate when the drive force transmission mechanism does not apply the rotational drive force to the drive roller. The drive roller may be biased at an end on the drive force transmission mechanism side with a biasing force smaller than an end of the drive roller opposite to the drive force transmission mechanism.

【００２０】上記構成によれば、付勢手段が、駆動力伝
達機構が駆動ローラに回転駆動力を付与していない状態
で、駆動ローラの駆動力伝達機構側の端部を、駆動ロー
ラの駆動力伝達機構と反対側の端部よりも小さい付勢力
で付勢するので、安価な構成で、駆動力伝達機構が回転
駆動力を駆動ローラに付与したとき、駆動ローラが従動
ローラに圧接される圧接力を軽減しつつ、付勢手段によ
る付勢力と当該回転駆動力が駆動ローラに作用する従動
ローラ方向の力とにより、駆動ローラが従動ローラに圧
接される圧接力を駆動ローラの軸方向（長手方向）で均
一にして、駆動ローラと従動ローラを長手方向において
均一な相互圧接幅で圧接させることができ、安価に、記
録紙に紙シワが発生することを防止しつつ、定着性を向
上させることができるとともに、駆動ローラと従動ロー
ラの耐久性を向上させることができる。According to the above construction, the urging means moves the end of the drive roller on the drive force transmission mechanism side in a state where the drive force transmission mechanism does not apply the rotational drive force to the drive roller. When the driving force transmission mechanism applies a rotational driving force to the driving roller with an inexpensive configuration, the driving roller is pressed against the driven roller because it is urged with a smaller urging force than the end opposite to the force transmission mechanism. While reducing the pressing force, the urging force of the urging means and the force of the rotation driving force acting on the driving roller in the driven roller direction cause the pressing force by which the driving roller is pressed against the driven roller in the axial direction of the driving roller ( In the longitudinal direction), the drive roller and the driven roller can be pressed against each other with a uniform mutual pressing width in the longitudinal direction. Inexpensively, it is possible to prevent the occurrence of paper wrinkles on the recording paper and improve the fixing property. Can be Rutotomoni, it is possible to improve the durability of the driving roller and the driven roller.

【００２１】また、例えば、請求項３に記載するよう
に、前記付勢手段は、少なくとも、前記駆動ローラの前
記駆動力伝達機構側の端部に配設されて前記駆動ローラ
を前記従動ローラ方向に付勢する駆動側バネと、前記駆
動ローラの前記駆動力伝達機構と反対側の端部に配設さ
れて前記駆動ローラを前記従動ローラ方向に付勢する非
駆動側バネと、を備え、前記駆動側バネと前記非駆動側
バネとでバネの種類が異なるものであってもよい。Further, for example, as described in claim 3, the urging means is disposed at least at an end of the driving roller on the driving force transmission mechanism side to move the driving roller in the direction of the driven roller. A drive-side spring that biases the drive roller, and a non-drive-side spring that is disposed at an end of the drive roller opposite to the drive force transmission mechanism and biases the drive roller toward the driven roller. The type of the spring may be different between the driving-side spring and the non-driving-side spring.

【００２２】上記構成によれば、付勢手段として、少な
くとも、駆動ローラの駆動力伝達機構側の端部に配設さ
れて駆動ローラを従動ローラ方向に付勢する駆動側バネ
と、駆動ローラの駆動力伝達機構と反対側の端部に配設
されて駆動ローラを従動ローラ方向に付勢する非駆動側
バネと、を備え、駆動側バネと非駆動側バネとでバネ種
類の異なるバネを使用しているので、より一層簡単な構
造で、かつ、安価に記録紙に紙シワが発生することを防
止することができるとともに、定着性を向上させること
ができる。According to the above configuration, as the urging means, at least the driving side spring disposed at the end of the driving roller on the driving force transmission mechanism side to urge the driving roller toward the driven roller, A non-drive-side spring disposed at the end opposite to the drive force transmission mechanism and biasing the drive roller in the driven roller direction, wherein different types of springs are used for the drive-side spring and the non-drive-side spring. Since it is used, it is possible to prevent paper wrinkles from occurring on the recording paper with a simpler structure and at a low cost, and to improve the fixing property.

【００２３】さらに、例えば、請求項４に記載するよう
に、前記付勢手段は、所定の支点を中心として回動可能
に配設され前記駆動ローラを所定の作用点で支持するテ
コ部材と、前記テコ部材の所定の力点に係合して前記テ
コ部材の前記作用点に支持されている前記駆動ローラを
前記従動ローラ方向に付勢する付勢部材と、を備えたテ
コ式付勢機構が、前記駆動ローラの前記駆動力伝達機構
側の端部と前記駆動力伝達機構と反対側の端部にそれぞ
れ設けられているものであってもよい。Further, for example, as described in claim 4, the urging means is provided rotatably about a predetermined fulcrum, and is a lever member for supporting the driving roller at a predetermined point of application; A lever-type biasing mechanism, comprising: a biasing member that engages a predetermined force point of the lever member and biases the drive roller supported at the action point of the lever member in the driven roller direction. The drive roller may be provided at an end on the drive force transmission mechanism side and an end on the opposite side to the drive force transmission mechanism.

【００２４】上記構成によれば、付勢手段を、所定の支
点を中心として回動可能に配設され駆動ローラを所定の
作用点で支持するテコ部材と、テコ部材の所定の力点に
係合してテコ部材の作用点に支持されている駆動ローラ
を従動ローラ方向に付勢する付勢部材と、を備えたテコ
式付勢機構が、駆動ローラの駆動力伝達機構側の端部と
駆動力伝達機構と反対側の端部にそれぞれ設けられたも
のとしているので、簡単な構造で、かつ、安価に、記録
紙に紙シワが発生することを防止することができるとと
もに、定着性を向上させることができる。According to the above construction, the urging means is provided so as to be rotatable around a predetermined fulcrum and supports the driving roller at a predetermined point of application, and engages with the predetermined force point of the lever member. And a biasing member for biasing the drive roller supported at the point of action of the lever member in the driven roller direction. Since it is provided at the end opposite to the force transmission mechanism, it is possible to prevent the occurrence of paper wrinkles on the recording paper with a simple structure and at low cost, and to improve the fixability. Can be done.

【００２５】また、例えば、請求項５に記載するよう
に、前記駆動力伝達機構側の前記テコ式付勢機構の前記
付勢部材と前記駆動力伝達機構と反対側の前記テコ式付
勢機構の前記付勢部材は、同じ種類の付勢部材であり、
前記テコ部材の異なる力点位置に係合しているものであ
ってもよい。Further, for example, as described in claim 5, the lever-type urging mechanism of the lever-type urging mechanism on the driving force transmitting mechanism side and the lever-type urging mechanism on the side opposite to the driving force transmitting mechanism. The urging members are the same type of urging members,
The lever member may be engaged with a different force point position.

【００２６】上記構成によれば、駆動力伝達機構側のテ
コ式付勢機構の付勢部材と駆動力伝達機構と反対側のテ
コ式付勢機構の付勢部材として、同じ種類の付勢部材を
使用し、テコ部材の異なる力点位置に係合させているの
で、付勢部材を共通化して、部品種類を減らすことがで
き、より一層安価に記録紙に紙シワが発生することを防
止することができるとともに、定着性を向上させること
ができる。According to the above configuration, the same type of urging member is used as the urging member of the lever-type urging mechanism on the driving force transmitting mechanism side and the lever member of the lever-type urging mechanism on the side opposite to the driving force transmitting mechanism. And the lever members are engaged at different power point positions, so that the urging member can be used in common, the number of types of components can be reduced, and the occurrence of paper wrinkles on the recording paper can be prevented even more inexpensively. And the fixability can be improved.

【００２７】[0027]

【発明の実施の形態】以下、本発明の好適な実施の形態
を添付図面に基づいて詳細に説明する。なお、以下に述
べる実施の形態は、本発明の好適な実施の形態であるか
ら、技術的に好ましい種々の限定が付されているが、本
発明の範囲は、以下の説明において特に本発明を限定す
る旨の記載がない限り、これらの態様に限られるもので
はない。Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. It should be noted that the embodiments described below are preferred embodiments of the present invention, and therefore, various technically preferable limitations are added. However, the scope of the present invention is not limited to the following description. The embodiments are not limited to these embodiments unless otherwise specified.

【００２８】図１〜図６は、本発明の定着装置の第１の
実施の形態を示す図であり、本実施の形態は、請求項１
から請求項３に対応するものである。図１は、本発明の
定着装置の第１の実施の形態を適用した電子写真式記録
装置１０の正面概略構成図である。FIGS. 1 to 6 are views showing a first embodiment of a fixing device according to the present invention.
To claim 3. FIG. 1 is a schematic front view of an electrophotographic recording apparatus 10 to which a first embodiment of a fixing device according to the present invention is applied.

【００２９】図１において、電子写真式記録装置１０
は、本体筐体１１内に感光体１２が回転可能に配設され
ており、感光体１２の周囲に、帯電部１３、露光部１
４、現像部１５、転写部１６、クリーニング部１７等が
配設されている。また、電子写真式記録装置１０には、
記録紙１８の収納される記録紙カセット１９が着脱可能
に装着されており、記録紙カセット１９内の記録紙１８
は、記録紙搬送機構２０により転写部１６に搬送され
る。さらに、電子写真式記録装置１０は、本体筐体１１
内に定着部（定着装置）２１が配設されており、後述す
るように、転写部１６でトナー画像の転写された記録紙
１８が定着部２１に搬送されて、定着部２１でトナー画
像の定着された記録紙１８は、本体筐体１１の側部に取
り付けられた排紙トレー２２上に排出される。In FIG. 1, an electrophotographic recording device 10
The photoconductor 12 is rotatably disposed in a main body housing 11, and a charging unit 13 and an exposure unit 1 are provided around the photoconductor 12.
4, a developing unit 15, a transfer unit 16, a cleaning unit 17, and the like are provided. Further, the electrophotographic recording device 10 includes:
A recording paper cassette 19 for accommodating the recording paper 18 is removably mounted.
Is transported to the transfer unit 16 by the recording paper transport mechanism 20. Further, the electrophotographic recording device 10 includes a main housing 11.
Inside, a fixing unit (fixing device) 21 is provided. As described later, the recording paper 18 on which the toner image is transferred by the transfer unit 16 is conveyed to the fixing unit 21, and the toner image of the toner image is fixed by the fixing unit 21. The fixed recording paper 18 is discharged onto a paper discharge tray 22 attached to the side of the main body housing 11.

【００３０】すなわち、電子写真式記録装置１０は、帯
電部１３で一様に帯電された感光体１２の表面に露光部
１４で静電潜像を形成し、静電潜像の形成された感光体
１２の表面に現像部１５でトナーを供給して現像する。
電子写真式記録装置１０は、トナー画像の形成された感
光体１２に記録紙搬送機構２０により記録紙カセット１
９から搬送されてくる記録紙１８に転写部１６でトナー
画像を転写し、感光体１２上に残留した残留トナー類
は、クリーニング部１７で回収される。That is, the electrophotographic recording apparatus 10 forms an electrostatic latent image on the surface of the photoreceptor 12 uniformly charged by the charging section 13 by the exposure section 14, and forms a photosensitive image on which the electrostatic latent image is formed. The developing unit 15 supplies toner to the surface of the body 12 to perform development.
The electrophotographic recording apparatus 10 uses a recording paper transport mechanism 20 to transfer a recording paper cassette 1 to a photoreceptor 12 on which a toner image is formed.
The transfer unit 16 transfers the toner image to the recording paper 18 conveyed from the printer 9, and the remaining toner remaining on the photoconductor 12 is collected by the cleaning unit 17.

【００３１】一方、転写部１６でトナー画像の転写され
た記録紙１８は、定着部２１に搬送され、定着部２１で
定着された後、排紙トレー２２上に排出される。On the other hand, the recording paper 18 to which the toner image has been transferred by the transfer unit 16 is conveyed to a fixing unit 21, fixed by the fixing unit 21, and then discharged onto a discharge tray 22.

【００３２】この定着部１６は、図２に示すように、回
転可能に支持された加熱ローラ（従動ローラ）２３と、
回転可能に、かつ、加熱ローラ２３方向に移動可能に支
持された加圧ローラ（駆動ローラ）２４と、を備えてお
り、加圧ローラ２４は、そのローラ軸２４ａの一方側端
部（図２では、左側端部）に回転伝達歯車２５が固定さ
れている。As shown in FIG. 2, the fixing section 16 includes a rotatably supported heating roller (driven roller) 23,
A pressure roller (drive roller) 24 rotatably supported so as to be movable in the direction of the heating roller 23. The pressure roller 24 has one end (see FIG. 2) of a roller shaft 24a. , The rotation transmission gear 25 is fixed to the left end).

【００３３】加熱ローラ２３は、鉄、アルミ等の金属パ
イプで円筒状に形成されており、当該パイプの内部の空
洞にハロゲンランプヒーター（図示略）が配設されてい
る。また、加熱ローラ２３の外表面には、ＰＦＡ、ＰＴ
ＦＡ等の離型層が形成されており、定着動作時には、内
部のハロゲンランプヒーターが発熱することにより、加
熱ローラ２３をトナーの溶融温度よりも高い定着温度に
加熱し、加圧ローラ２４との間で記録紙１８に付着され
ているトナー画像を溶融・圧接して、トナー画像を記録
紙１８に定着させる。なお、加熱ローラ２３としては、
上記構成に限るものではなく、例えば、発熱セラミック
ス等のように、円筒状のパイプ自体が発熱するタイプの
ものであってもよいし、ガラスパイプあるいは耐熱樹脂
パイプ等の非電導部材に発熱抵抗体を有する層を形成し
て発熱させるタイプのものであってもよい。さらに、加
熱ローラ２３としては、鉄、アルミ等で形成した円筒状
パイプの上に非電導部材を形成し、さらにその上に発熱
抵抗体を有する層を形成して発熱させるタイプのもので
あってもよい。The heating roller 23 is formed in a cylindrical shape by a metal pipe such as iron or aluminum, and a halogen lamp heater (not shown) is provided in a hollow inside the pipe. In addition, PFA, PT
A release layer of FA or the like is formed, and during the fixing operation, an internal halogen lamp heater generates heat, so that the heating roller 23 is heated to a fixing temperature higher than the melting temperature of the toner. The toner image adhered to the recording paper 18 is melted and pressed in between to fix the toner image on the recording paper 18. In addition, as the heating roller 23,
The present invention is not limited to the above-described configuration. For example, it may be of a type in which a cylindrical pipe itself generates heat, such as a heat-generating ceramic, or a heating resistor may be formed on a non-conductive member such as a glass pipe or a heat-resistant resin pipe. May be of a type in which a layer having is formed to generate heat. Further, the heating roller 23 is of a type in which a non-conductive member is formed on a cylindrical pipe formed of iron, aluminum, or the like, and a layer having a heating resistor is further formed thereon to generate heat. Is also good.

【００３４】加圧ローラ２４は、例えば、鉄、アルミ等
の金属をローラ軸（軸心）２４ａとして、周囲にシリコ
ンゴム等の耐熱温度の高いゴムを形成し、最外周に離型
性の良好なフッ素系樹脂層が形成されている。The pressure roller 24 has a roller shaft (axial center) 24a made of a metal such as iron or aluminum, and a rubber having a high heat-resistant temperature such as silicon rubber is formed around the roller 24a. Fluorine-based resin layer is formed.

【００３５】加圧ローラ２４は、一対の付勢部材（付勢
手段）２６ａ、２６ｂによりローラ軸２４ａを介して加
熱ローラ２３方向に付勢されており、上記回転伝達歯車
２５には、図示しない駆動モータにより回転駆動される
駆動歯車２７が歯合している。したがって、加圧ローラ
２４は、付勢部材２６ａ、２６ｂにより加圧ローラ２４
が圧接された状態で、回転伝達歯車２５に歯合する駆動
歯車２７により回転駆動される駆動ローラとして動作
し、加熱ローラ２３は、加圧ローラ２４が回転伝達歯車
２５に歯合する駆動歯車２７により回転駆動されると、
加圧ローラ２４の回転に従動して回転する従動ローラと
して動作する。上記回転伝達歯車２５及び駆動歯車２７
は、全体として駆動力伝達機構として機能する。The pressure roller 24 is urged toward the heating roller 23 via a roller shaft 24a by a pair of urging members (urging means) 26a, 26b. A drive gear 27 that is rotationally driven by a drive motor meshes. Therefore, the pressure roller 24 is pressed by the urging members 26a and 26b.
When the pressure roller 24 is pressed, the heating roller 23 operates as a driving roller that is rotationally driven by a driving gear 27 that meshes with the rotation transmitting gear 25. The heating roller 23 is a driving gear 27 that meshes with the pressing roller 24 with the rotation transmitting gear 25. When driven to rotate by
It operates as a driven roller that rotates following the rotation of the pressure roller 24. The rotation transmitting gear 25 and the driving gear 27
Function as a driving force transmission mechanism as a whole.

【００３６】上記付勢部材２６ａ、２６ｂは、例えば、
圧縮バネが使用されており、それぞれローラ軸２４ａを
介して加圧ローラ２４の回転伝達歯車２５側の端部と、
回転伝達歯車２５と反対側の端部と、を加熱ローラ２３
方向へ付勢する。回転伝達歯車２５側の付勢部材２６ａ
と回転伝達歯車２５と反対側の付勢部材２６ｂとは、付
勢力の異なるものが使用されており、例えば、回転伝達
歯車２５側の付勢部材２６ａは、回転伝達歯車２５と反
対側の付勢部材２６ｂよりも小さい付勢力で加圧ローラ
２４を加熱ローラ２３方向に付勢する。The urging members 26a and 26b are, for example,
A compression spring is used, and an end of the pressure roller 24 on the side of the rotation transmission gear 25 via the roller shaft 24a,
The end opposite to the rotation transmitting gear 25 and the heating roller 23
Energize in the direction. The urging member 26a on the rotation transmission gear 25 side
The urging member 26b on the side opposite to the rotation transmitting gear 25 is different from the urging member 26b on the side opposite to the rotation transmitting gear 25. For example, the urging member 26a on the side of the rotation transmitting gear 25 is The pressure roller 24 is urged toward the heating roller 23 with an urging force smaller than the urging member 26b.

【００３７】すなわち、図３に示すように、加圧ローラ
２４は、一対の付勢部材２６ａ、２６ｂにより加熱ロー
ラ２３方向に付勢されることにより、加熱ローラ２３と
所定の圧接幅Ｌを有して加熱ローラ２３と圧接される
が、回転伝達歯車２５側の付勢部材２６ａと回転伝達歯
車２５と反対側の付勢部材２６ｂとが、付勢力の異なる
ものが使用されており、例えば、回転伝達歯車２５側の
付勢部材２６ａが、回転伝達歯車２５と反対側の付勢部
材２６ｂよりも小さい付勢力で加圧ローラ２４を加熱ロ
ーラ２３方向に付勢する場合には、図４に示すように、
回転伝達歯車２５側端部での加熱ローラ２３との圧接幅
Ｌａが、回転伝達歯車２５と反対側端部での加熱ローラ
２３との圧接幅Ｌｂよりも狭くなっている。That is, as shown in FIG. 3, the pressure roller 24 is biased in the direction of the heating roller 23 by a pair of biasing members 26a and 26b, and has a predetermined pressure contact width L with the heating roller 23. The pressing member 26a on the side of the rotation transmission gear 25 and the pressing member 26b on the side opposite to the rotation transmission gear 25 have different urging forces. When the urging member 26a on the rotation transmitting gear 25 urges the pressure roller 24 toward the heating roller 23 with a smaller urging force than the urging member 26b on the opposite side to the rotation transmitting gear 25, FIG. As shown,
The pressure contact width La at the end of the rotation transmission gear 25 with the heating roller 23 is smaller than the pressure contact width Lb with the heating roller 23 at the end opposite to the rotation transmission gear 25.

【００３８】そして、上記駆動歯車２７は、回転伝達歯
車２５に歯合して回転伝達歯車２５を回転駆動させると
き、駆動歯車２７が回転伝達歯車２５に作用する力が、
図５に示すように、回転伝達歯車２５に対して回転伝達
歯車２５側のローラ軸２４ａに作用する付勢部材２６ａ
の付勢力Ｆｓａと同じ向きで、加圧ローラ２４を加熱ロ
ーラ２３に押圧させる向きの押圧力Ｆｔｐとして作用す
る。When the drive gear 27 meshes with the rotation transmission gear 25 and drives the rotation transmission gear 25 to rotate, the force applied by the drive gear 27 to the rotation transmission gear 25 is:
As shown in FIG. 5, the urging member 26a acting on the roller shaft 24a on the rotation transmission gear 25 side with respect to the rotation transmission gear 25
And acts as a pressing force Ftp in a direction to press the pressure roller 24 against the heating roller 23 in the same direction as the urging force Fsa.

【００３９】次に、本実施の形態の動作を説明する。定
着部２１は、加圧ローラ２４が付勢部材２６ａ、２６ｂ
により加熱ローラ２３方向に付勢され、加圧ローラ２４
と加熱ローラ２３とは、圧接されている。Next, the operation of this embodiment will be described. The fixing unit 21 is configured such that the pressing roller 24 includes the urging members 26a and 26b.
Urged toward the heating roller 23 by the
And the heating roller 23 are pressed against each other.

【００４０】この付勢部材２６ａ、２６ｂは、上述のよ
うに、回転伝達歯車２５側の付勢部材２６ａの付勢力Ｆ
ｓａが回転伝達歯車２５と反対側の付勢部材２６ｂの付
勢力Ｆｓｂよりも所定圧力だけ小さく設定されているた
め、駆動歯車２７により回転伝達歯車２５が回転駆動さ
れていない状態のときには、加圧ローラ２４と加熱ロー
ラ２３との圧接部幅Ｌは、図４に示したように、回転伝
達歯車２５側の端部の圧接幅Ｌａが、回転伝達歯車２５
と反対側の端部の圧接幅Ｌｂよりも狭くなっており、加
圧ローラ２４及び加熱ローラ２３の軸方向（長手方向）
で不均一になっている。As described above, the urging members 26a and 26b apply the urging force F of the urging member 26a on the rotation transmitting gear 25 side.
Since sa is set to be smaller than the urging force Fsb of the urging member 26b on the side opposite to the rotation transmission gear 25 by a predetermined pressure, when the rotation transmission gear 25 is not rotationally driven by the drive gear 27, the pressure is increased. As shown in FIG. 4, the width L of the pressure contact portion between the roller 24 and the heating roller 23 is such that the width La of the pressure contact at the end on the side of the rotation transmission gear 25 is
The width is smaller than the press-contact width Lb at the end on the opposite side to the pressing direction, and the axial direction (longitudinal direction) of the pressing roller 24 and the heating roller 23.
Is uneven.

【００４１】ところが、電子写真式記録装置１０による
記録紙１８への記録動作が開始され、駆動歯車２７が回
転して回転伝達歯車２５が駆動歯車２７により回転駆動
されると、いま、駆動歯車２７が回転伝達歯車２５に歯
合して、回転伝達歯車２５を回転駆動する際に回転伝達
歯車２５、ひいては、加圧ローラ２４に作用する力は、
図５に示したように、加圧ローラ２４を加熱ローラ２３
方向に付勢する押圧力Ｆｔｐである。However, when the recording operation on the recording paper 18 by the electrophotographic recording apparatus 10 is started, and the drive gear 27 is rotated to rotate the rotation transmission gear 25 by the drive gear 27, the drive gear 27 Meshes with the rotation transmission gear 25 and when the rotation transmission gear 25 is rotationally driven, the force acting on the rotation transmission gear 25 and, consequently, the pressure roller 24 is:
As shown in FIG. 5, the pressing roller 24 is
The pressing force Ftp for urging in the direction.

【００４２】したがって、駆動歯車２７が回転伝達歯車
２５を回転駆動しているときには、加圧ローラ２４は、
図５に示したように、その回転伝達歯車２５側の端部
が、回転伝達歯車２５側に配設された付勢部材２６ａの
付勢力Ｆｓａと駆動歯車２７による押圧力Ｆｔｐとの加
算した圧接力Ｆ（Ｆ＝Ｆｓａ＋Ｆｔｐ）により加熱ロー
ラ２３方向に付勢され、その回転伝達歯車２５と反対側
の端部が、回転伝達歯車２５と反対側に配設された付勢
部材２６ｂの付勢力Ｆｓｂにより加熱ローラ２３方向に
付勢され、加圧ローラ２４の加熱ローラ２３方向への付
勢力が軸方向（長手方向）において均一なものとなる。
その結果、加圧ローラ２４が駆動歯車２７により回転駆
動されているときには、加圧ローラ２４と加熱ローラ２
３との圧接部幅Ｌは、図６に示すように、回転伝達歯車
２５側の圧接幅Ｌａ’と回転伝達歯車２５と反対側の圧
接幅Ｌｂ’とが略同じ幅になり、加圧ローラ２４及び加
熱ローラ２３との圧接幅Ｌが軸方向で均一になる。Therefore, when the drive gear 27 is driving the rotation transmission gear 25 to rotate, the pressure roller 24
As shown in FIG. 5, the end on the side of the rotation transmission gear 25 has a pressure contact obtained by adding the urging force Fsa of the urging member 26 a disposed on the side of the rotation transmission gear 25 and the pressing force Ftp by the drive gear 27. The force F (F = Fsa + Ftp) is urged in the direction of the heating roller 23, and the end opposite to the rotation transmitting gear 25 has an urging force Fsb of an urging member 26 b disposed on the opposite side to the rotation transmitting gear 25. Thus, the urging force of the pressure roller 24 toward the heating roller 23 becomes uniform in the axial direction (longitudinal direction).
As a result, when the pressure roller 24 is rotationally driven by the drive gear 27, the pressure roller 24 and the heating roller 2
As shown in FIG. 6, the pressure contact width La ′ of the rotation transmission gear 25 side and the pressure contact width Lb ′ of the opposite side to the rotation transmission gear 25 become substantially the same, as shown in FIG. The pressure contact width L between the heating roller 24 and the heating roller 23 becomes uniform in the axial direction.

【００４３】したがって、転写部１６でトナー画像の転
写された記録紙１８が定着部２１に搬送されてくると、
定着部２１は、加圧ローラ２４を駆動歯車２７で回転駆
動するとともに、加熱ローラ２３を所定の定着温度に加
熱し、加圧ローラ２４が回転駆動されることにより、加
熱ローラ２３が加圧ローラ２４に従動して回転する。こ
のとき、加圧ローラ２４と加熱ローラ２３とは、軸方向
において均一な圧力で圧接されて、その圧接幅Ｌが軸方
向で一定している。定着部２１は、この加圧ローラ２４
と加熱ローラ２３の間に搬送されてくると、加圧ローラ
２４と軸方向において均一な圧接力Ｆで、かつ、均一な
圧接幅Ｌで圧接される加熱ローラ２３により押圧して搬
送しつつ、加熱ローラ２３の熱により記録紙１８に付着
されたトナー画像を溶融して、記録紙１８上のトナー画
像を記録紙１８に定着させ、排紙トレー２２上に排出す
る。Therefore, when the recording paper 18 on which the toner image has been transferred by the transfer unit 16 is conveyed to the fixing unit 21,
The fixing unit 21 drives the pressure roller 24 to rotate by a driving gear 27, heats the heating roller 23 to a predetermined fixing temperature, and drives the pressure roller 24 to rotate. It rotates following 24. At this time, the pressing roller 24 and the heating roller 23 are pressed against each other with a uniform pressure in the axial direction, and the pressing width L is constant in the axial direction. The fixing unit 21 includes the pressure roller 24
Is transferred between the heating roller 23 and the heating roller 23, while being pressed by the heating roller 23 pressed against the pressing roller 24 with a uniform pressing force F in the axial direction and a uniform pressing width L, The toner image adhered to the recording paper 18 is melted by the heat of the heating roller 23, the toner image on the recording paper 18 is fixed on the recording paper 18, and is discharged onto the discharge tray 22.

【００４４】その結果、簡単な構成で、かつ、安価に、
記録紙１８に紙シワが発生することを防止することがで
きるとともに、定着性能を向上させることができる。As a result, with a simple configuration and at low cost,
It is possible to prevent paper wrinkles from occurring on the recording paper 18 and to improve the fixing performance.

【００４５】また、本実施の形態においては、駆動歯車
２７が加圧ローラ２４に回転駆動力を付与していない状
態で、加圧ローラ２４の回転伝達歯車２５側の端部を付
勢する付勢部材２６ａが、加圧ローラ２４の回転伝達歯
車２５と反対側の端部を付勢する付勢部材２６ｂよりも
小さい付勢力で付勢しているので、駆動歯車２７が回転
駆動力を加圧ローラ２４に付与したとき、加圧ローラ２
４が加熱ローラ２３に圧接される圧接力を軽減しつつ、
付勢部材２６ａ、２６ｂによる付勢力と駆動歯車２７が
加圧ローラ２４に作用する加熱ローラ２３方向の力とに
より、加圧ローラ２４が加熱ローラ２３に圧接される圧
接力が加圧ローラ２４の軸方向（長手方向）で均一とし
て、加圧ローラ２４と加熱ローラ２３を長手方向におい
て均一な相互圧接幅Ｌで圧接させることができる。した
がって、加圧ローラ２４及び加熱ローラ２３の耐久性を
向上させることができる。Further, in the present embodiment, in a state where the driving gear 27 does not apply the rotational driving force to the pressing roller 24, the end of the pressing roller 24 on the side of the rotation transmitting gear 25 is urged. Since the urging member 26a urges with a smaller urging force than the urging member 26b that urges the end of the pressure roller 24 opposite to the rotation transmitting gear 25, the driving gear 27 applies the rotational driving force. When applied to the pressure roller 24, the pressure roller 2
4, while reducing the pressing force applied to the heating roller 23,
Due to the urging force of the urging members 26a and 26b and the force of the drive gear 27 acting on the pressure roller 24 in the direction of the heating roller 23, the pressure contact force for pressing the pressure roller 24 against the heating roller 23 increases the pressure contact force of the pressure roller 24. The pressing roller 24 and the heating roller 23 can be pressed against each other with a uniform mutual pressing width L in the longitudinal direction as uniform in the axial direction (longitudinal direction). Therefore, the durability of the pressure roller 24 and the heating roller 23 can be improved.

【００４６】なお、上記実施の形態においては、駆動歯
車２７が回転伝達歯車２５に作用する力の向きが、付勢
部材２６ａの付勢力Ｆｓａの向きと同じ向きである押圧
力Ｆｔｐの場合について説明したが、駆動歯車２７の配
設位置により、回転伝達歯車２５に作用する力の向き
が、図７に示すように、付勢部材２６ｂの付勢力Ｆｓａ
の向きと逆向きである離脱力Ｆｔｑであってもよい。In the above embodiment, the case where the direction of the force applied by the drive gear 27 to the rotation transmitting gear 25 is the pressing force Ftp which is the same as the direction of the urging force Fsa of the urging member 26a will be described. However, depending on the arrangement position of the drive gear 27, the direction of the force acting on the rotation transmission gear 25 changes, as shown in FIG. 7, the urging force Fsa of the urging member 26b.
May be the disengagement force Ftq which is opposite to the direction.

【００４７】この場合、回転伝達歯車２５側の付勢部材
２６ａと回転伝達歯車２５と反対側の付勢部材２６ｂと
は、上記実施の形態と同様に、付勢力の異なるものが使
用されるが、回転伝達歯車２５側の付勢部材２６ａが、
回転伝達歯車２５と反対側の付勢部材２６ｂよりも大き
い付勢力で加圧ローラ２４を加熱ローラ２３方向に付勢
し、回転伝達歯車２５側端部での加熱ローラ２３との圧
接幅Ｌａが、回転伝達歯車２５と反対側端部での加熱ロ
ーラ２３との圧接幅Ｌｂよりも広くなるようにする。In this case, as the urging member 26a on the side of the rotation transmitting gear 25 and the urging member 26b on the side opposite to the rotation transmitting gear 25, those having different urging forces are used as in the above embodiment. , The urging member 26a on the side of the rotation transmission gear 25,
The pressing roller 24 is urged in the direction of the heating roller 23 with an urging force larger than the urging member 26b on the opposite side to the rotation transmission gear 25, and the pressure contact width La with the heating roller 23 at the end of the rotation transmission gear 25 side is reduced. The width Lb of the heating roller 23 at the end opposite to the rotation transmitting gear 25 is made wider than the pressing width Lb.

【００４８】このようにすることにより、駆動歯車２７
により回転伝達歯車２５が回転駆動されると、駆動歯車
２７が回転伝達歯車２５に作用する力が離脱力Ｆｔｑと
して作用し、加圧ローラ２４が軸方向において均一な圧
接力Ｆで加熱ローラ２３に押圧される。したがって、こ
の場合にも、加圧ローラ２４と加熱ローラ２３とが軸方
向において全て均一な圧接幅Ｌで圧接され、記録紙１８
に紙シワを発生させることなく、良好な定着性能でトナ
ーを記録紙１８定着させることができる。In this manner, the driving gear 27
When the rotation transmission gear 25 is driven to rotate, the force of the drive gear 27 acting on the rotation transmission gear 25 acts as a separation force Ftq, and the pressing roller 24 applies a uniform pressing force F in the axial direction to the heating roller 23. Pressed. Therefore, also in this case, the pressure roller 24 and the heating roller 23 are pressed against each other with a uniform pressure width L in the axial direction, and the recording paper 18 is pressed.
The toner can be fixed on the recording paper 18 with good fixing performance without causing paper wrinkles.

【００４９】図８及び図９は、本発明の定着装置の第２
の実施の形態を示す図であり、本実施の形態は、付勢手
段としてテコ式付勢機構を利用したもので、請求項４及
び請求項５に対応するものである。FIGS. 8 and 9 show the second embodiment of the fixing device of the present invention.
FIG. 9 is a view showing an embodiment of the present invention, and this embodiment utilizes a lever-type urging mechanism as urging means, and corresponds to claims 4 and 5.

【００５０】なお、本実施の形態は、上記第１の実施の
形態と同様の定着部に適用したものであり、本実施の形
態の説明においては、第１の実施の形態と同様の構成部
分については、同一の符号を用いて、その詳細な説明を
省略する。The second embodiment is applied to the same fixing unit as that of the first embodiment. In the description of the second embodiment, the same components as those of the first embodiment will be described. , The same reference numerals are used, and detailed description thereof is omitted.

【００５１】図８において、定着部３０は、例えば、図
１に示した電子写真式記録装置１０と同様の電子写真式
記録装置に適用され、回転可能に支持された加熱ローラ
（従動ローラ）２３と、回転可能に、かつ、加熱ローラ
２３方向に移動可能に支持された加圧ローラ（駆動ロー
ラ）２４と、を備えている。加圧ローラ２４は、そのロ
ーラ軸２４ａの一方側端部に回転伝達歯車２５が固定さ
れており、回転伝達歯車２５には、図示しない駆動モー
タにより回転駆動される駆動歯車２７が歯合している。In FIG. 8, a fixing unit 30 is applied to, for example, an electrophotographic recording apparatus similar to the electrophotographic recording apparatus 10 shown in FIG. 1, and is a rotatably supported heating roller (driven roller) 23. And a pressure roller (drive roller) 24 rotatably supported movably in the direction of the heating roller 23. The pressure transmitting roller 24 has a rotation transmission gear 25 fixed to one end of a roller shaft 24a. The rotation transmission gear 25 meshes with a driving gear 27 that is driven to rotate by a driving motor (not shown). I have.

【００５２】加圧ローラ２４は、そのローラ軸２４ａの
両端部に係合するテコ部材３１、３２を介して付勢部材
３３、３４、例えば、圧縮バネにより加熱ローラ２３方
向に付勢されている。この付勢部材３３及び付勢部材３
４は、同じ種類の付勢部材が使用されている。すなわ
ち、付勢部材３３、３４として圧縮バネが使用されてい
るときには、バネ線の太さや巻き径等を同じにして、同
じバネ定数の圧縮バネが使用されている。The pressure roller 24 is urged in the direction of the heating roller 23 by urging members 33 and 34, for example, compression springs, via lever members 31 and 32 which engage with both ends of the roller shaft 24a. . The urging member 33 and the urging member 3
No. 4 uses the same type of urging member. That is, when the compression springs are used as the urging members 33 and 34, the compression springs having the same spring constant and the same spring wire diameter and the same winding diameter are used.

【００５３】テコ部材３１、３２は、回転伝達歯車２５
側のテコ部材３１について、図９に示すように、支点軸
３５により回動可能に支持されており、テコ部材３１、
３２の支点軸３５と反対側の端部には、所定距離離れて
２個の係合溝Ｍ１、Ｍ２が形成されている。上記付勢部
材３３、３４は、テコ部材３１、３２の係合溝Ｍ１、Ｍ
２にそれぞれ係合されており、具体的には、加圧ローラ
２４の回転伝達歯車２５側のテコ部材３１には、支点軸
３５に近い側の係合溝Ｍ１に付勢部材３３が係合し、加
圧ローラ２４の回転伝達歯車２５と反対側のテコ部材３
２には、支点軸３５から遠い側の係合溝Ｍ２に付勢部材
３４が係合している。The lever members 31 and 32 are connected to the rotation transmitting gear 25.
As shown in FIG. 9, the lever member 31 on the side is rotatably supported by a fulcrum shaft 35.
Two engagement grooves M1 and M2 are formed at an end opposite to the fulcrum shaft 35 at a predetermined distance. The urging members 33 and 34 are engaged with the engagement grooves M1 and M of the lever members 31 and 32, respectively.
Specifically, the urging member 33 engages with the lever member 31 on the rotation transmission gear 25 side of the pressure roller 24 in the engagement groove M1 on the side close to the fulcrum shaft 35. And the lever member 3 on the side opposite to the rotation transmitting gear 25 of the pressure roller 24.
2, the urging member 34 is engaged with the engagement groove M2 on the side far from the fulcrum shaft 35.

【００５４】テコ部材３１、３２は、その上面で加圧ロ
ーラ２４のローラ軸２４ａを支持しており、テコ部材３
１、３２を回動可能に支持している支点軸３５からロー
ラ軸２４ａまでの距離は、テコ部材３１とテコ部材３２
のいずれにおいても同じ距離に設定されている。The lever members 31 and 32 support the roller shaft 24a of the pressure roller 24 on the upper surface thereof.
The distance from the fulcrum shaft 35 that rotatably supports the first and second rollers 32 to the roller shaft 24a is determined by the lever member 31 and the lever member 32.
Are set to the same distance.

【００５５】すなわち、テコ部材３１は、支点軸３５を
支点、ローラ軸２４ａの係合位置を作用点として、係合
溝Ｍ１を力点として、力点である係合溝Ｍ１に係合され
た付勢部材３３の付勢力により作用点に係合するローラ
軸２４ａを加熱ローラ２３方向に付勢する。また、テコ
部材３２は、支点軸３５を支点、ローラ軸２４ａの係合
位置を作用点として、係合溝Ｍ２を力点として、力点で
ある係合溝Ｍ２に係合された付勢部材３４の付勢力によ
り作用点に係合するローラ軸２４ａを加熱ローラ２３方
向に付勢する。そして、回転伝達歯車２５側のテコ部材
３１には、支点軸３５に近い方の係合溝Ｍ１に付勢部材
３３が係合し、回転伝達歯車２５と反対側のテコ部材３
２には、支点軸３５から遠い方の係合溝Ｍ２に付勢部材
３４が係合している。That is, the lever member 31 is urged into engagement with the engaging groove M1, which is a power point, using the fulcrum shaft 35 as a fulcrum, the engagement position of the roller shaft 24a as an action point, and the engagement groove M1 as a power point. The urging force of the member 33 urges the roller shaft 24a engaging with the action point in the direction of the heating roller 23. Further, the lever member 32 uses the fulcrum shaft 35 as a fulcrum, the engagement position of the roller shaft 24a as an action point, the engagement groove M2 as a force point, and the urging member 34 engaged with the engagement groove M2 as a force point. The roller shaft 24a engaging with the action point is urged toward the heating roller 23 by the urging force. The urging member 33 engages with the lever member 31 on the rotation transmission gear 25 side in the engagement groove M1 closer to the fulcrum shaft 35, and the lever member 3 on the opposite side to the rotation transmission gear 25.
2, the urging member 34 is engaged with the engagement groove M2 farther from the fulcrum shaft 35.

【００５６】したがって、回転伝達歯車２５側のテコ部
材３１は、回転伝達歯車２５と反対側のテコ部材３２よ
りも弱い付勢力で加圧ローラ２４を加熱ローラ２３に付
勢する。上記テコ部材３１、３２、付勢部材３３、３４
及び支点軸３５は、テコ式伝達機構として機能する。Therefore, the lever member 31 on the side of the rotation transmission gear 25 urges the pressure roller 24 to the heating roller 23 with a smaller urging force than the lever member 32 on the side opposite to the rotation transmission gear 25. Lever members 31, 32, urging members 33, 34
The fulcrum shaft 35 functions as a lever-type transmission mechanism.

【００５７】本実施の形態によれば、回転伝達歯車２５
側のテコ部材３１が、回転伝達歯車２５と反対側のテコ
部材３２よりも弱い付勢力で加圧ローラ２４を加熱ロー
ラ２３に付勢するので、駆動歯車２７により回転伝達歯
車２５が回転駆動されていない状態のときには、加圧ロ
ーラ２４と加熱ローラ２３との圧接部幅Ｌは、第１の実
施の形態と同様に、図４に示したように、回転伝達歯車
２５側の端部の圧接幅Ｌａが、回転伝達歯車２５と反対
側の端部の圧接幅Ｌｂよりも狭くなっており、加圧ロー
ラ２４及び加熱ローラ２３の軸方向で不均一になってい
る。According to the present embodiment, the rotation transmission gear 25
The lever member 31 on the side urges the pressure roller 24 against the heating roller 23 with a weaker urging force than the lever member 32 on the side opposite to the rotation transmission gear 25, so that the rotation transmission gear 25 is rotationally driven by the drive gear 27. When the pressing roller 24 and the heating roller 23 are not in contact with each other, the pressing portion width L between the pressing roller 24 and the heating roller 23 is the same as in the first embodiment, as shown in FIG. The width La is smaller than the pressure contact width Lb at the end opposite to the rotation transmitting gear 25, and is uneven in the axial direction of the pressing roller 24 and the heating roller 23.

【００５８】ところが、駆動歯車２７が回転して回転伝
達歯車２５が駆動歯車２７により回転駆動されると、い
ま、駆動歯車２７が回転伝達歯車２５に歯合して、回転
伝達歯車２５を回転駆動する際に回転伝達歯車２５、ひ
いては、加圧ローラ２４に作用する力は、図５に示した
ように、加圧ローラ２４を加熱ローラ２３方向に付勢す
る押圧力Ｆｔｐである。However, when the drive gear 27 rotates and the rotation transmission gear 25 is driven to rotate by the drive gear 27, the drive gear 27 meshes with the rotation transmission gear 25 and drives the rotation transmission gear 25. At this time, the force acting on the rotation transmission gear 25 and, consequently, the pressure roller 24 is a pressing force Ftp for urging the pressure roller 24 toward the heating roller 23 as shown in FIG.

【００５９】したがって、駆動歯車２７が回転伝達歯車
２５を回転駆動しているときには、加圧ローラ２４は、
図５に示したように、その回転伝達歯車２５側の端部
が、回転伝達歯車２５側に配設された係合溝Ｍ１に係合
する付勢部材３３により付勢されているテコ部材３１の
付勢力Ｆｓａと駆動歯車２７による押圧力Ｆｔｐとの加
算した圧接力Ｆ（Ｆ＝Ｆｓａ＋Ｆｔｐ）により加熱ロー
ラ２３方向に付勢され、その回転伝達歯車２５と反対側
の端部が、回転伝達歯車２５と反対側に配設された係合
溝Ｍ２に係合する付勢部材３４により付勢されたテコ部
材３２により加熱ローラ２３方向に付勢され、加圧ロー
ラ２４の加熱ローラ２３方向への付勢力が軸方向におい
て均一なものとなる。その結果、加圧ローラ２４が駆動
歯車２７により回転駆動されているときには、加圧ロー
ラ２４と加熱ローラ２３との圧接部幅Ｌは、図６に示し
たように、回転伝達歯車２５側の圧接幅Ｌａ’と回転伝
達歯車２５と反対側の圧接幅Ｌｂ’とが略同じ幅にな
り、加圧ローラ２４及び加熱ローラ２３との圧接幅Ｌが
軸方向で均一になる。Therefore, when the drive gear 27 is driving the rotation transmission gear 25 to rotate, the pressure roller 24
As shown in FIG. 5, a lever member 31 whose end on the rotation transmission gear 25 side is urged by an urging member 33 that engages with an engagement groove M1 provided on the rotation transmission gear 25 side. And the pressing force Ftp (F = Fsa + Ftp) obtained by adding the pressing force Ftp of the drive gear 27 toward the heating roller 23, and the end opposite to the rotation transmission gear 25 is rotated by the rotation transmission gear 25. The pressing roller 24 is urged in the direction of the heating roller 23 by the lever member 32 urged by the urging member 34 that engages with the engaging groove M2 disposed on the side opposite to the direction 25. The biasing force becomes uniform in the axial direction. As a result, when the pressure roller 24 is being driven to rotate by the drive gear 27, the width L of the pressure contact portion between the pressure roller 24 and the heating roller 23 is, as shown in FIG. The width La ′ and the pressure contact width Lb ′ on the side opposite to the rotation transmitting gear 25 are substantially the same, and the pressure contact width L between the pressing roller 24 and the heating roller 23 becomes uniform in the axial direction.

【００６０】したがって、トナー画像の転写された記録
紙１８が定着部３０に搬送されてくると、定着部３０
は、加圧ローラ２４を駆動歯車２７で回転駆動するとと
もに、加熱ローラ２３を所定の定着温度に加熱し、加圧
ローラ２４が回転駆動されることにより、加熱ローラ２
３が加圧ローラ２４に従動して回転する。このとき、加
圧ローラ２４と加熱ローラ２３とは、軸方向において均
一な圧力で圧接されて、その圧接幅Ｌが軸方向で一定し
ている。定着部３０は、この加圧ローラ２４と加熱ロー
ラ２３の間に搬送されてくると、加圧ローラ２４と軸方
向において均一な圧接力Ｆで、かつ、均一な圧接幅Ｌで
圧接される加熱ローラ２３により押圧して搬送しつつ、
加熱ローラ２３の熱により記録紙１８に付着されたトナ
ー画像を溶融して、記録紙１８上のトナー画像を記録紙
１８に定着させる。その結果、記録紙１８に紙シワを発
生させることなく、良好な定着性能でトナーを記録紙１
８定着させることができる。Therefore, when the recording paper 18 onto which the toner image has been transferred is conveyed to the fixing unit 30, the fixing unit 30
The heating roller 23 is driven to rotate at a predetermined fixing temperature while the pressing roller 24 is driven to rotate by a driving gear 27, and the pressing roller 24 is driven to rotate.
3 rotates following the pressure roller 24. At this time, the pressing roller 24 and the heating roller 23 are pressed against each other with a uniform pressure in the axial direction, and the pressing width L is constant in the axial direction. When the fixing unit 30 is conveyed between the pressure roller 24 and the heating roller 23, the heating unit 30 is pressed against the pressure roller 24 with a uniform pressing force F and a uniform pressing width L in the axial direction. While pressing and conveying by the roller 23,
The toner image adhered to the recording paper 18 is melted by the heat of the heating roller 23, and the toner image on the recording paper 18 is fixed on the recording paper 18. As a result, without causing paper wrinkles on the recording paper 18, the toner is applied to the recording paper 1 with good fixing performance.
8 can be fixed.

【００６１】また、本実施の形態においては、付勢部材
３３と付勢部材３４を同じものを使用し、付勢部材３３
をテコ部材３１に係合させる係合溝Ｍ１と付勢部材３４
をテコ部材３２に係合させる係合溝Ｍ２を変えることに
より、付勢力を異ならせているため、付勢部材を共通化
して、部品種類を減らすことができ、より一層安価なも
のとすることができる。Further, in the present embodiment, the same urging member 33 and urging member 34 are used,
M1 for engaging the lever with the lever member 31 and the urging member 34
Since the urging force is varied by changing the engagement groove M2 for engaging the lever member 32 with the lever member 32, the urging member can be shared, the number of component types can be reduced, and the cost can be further reduced. Can be.

【００６２】なお、本実施の形態においては、付勢部材
３３と付勢部材３４を同じものを使用して、付勢部材３
３をテコ部材３１に係合させる係合溝Ｍ１と付勢部材３
４をテコ部材３２に係合させる係合溝Ｍ２を変えること
により、付勢力を異ならせているが、付勢部材３３と係
合部材３４を付勢力のことなるものを使用し、付勢部材
３３のテコ部材３１への支点軸３５からの係合位置と付
勢部材３４のテコ部材３２への支点軸３５からの係合位
置を同じ距離の位置にしても良い。In this embodiment, the same urging member 33 and urging member 34 are used,
Groove 3 for engaging lever member 3 with lever member 31 and urging member 3
The urging force is changed by changing the engagement groove M2 for engaging the lever 4 with the lever member 32. The urging member 33 and the engaging member 34 having different urging forces are used. The position of the engagement of the lever 33 with the lever member 31 from the fulcrum shaft 35 and the position of the urging member 34 with the lever member 32 from the fulcrum shaft 35 may be the same distance.

【００６３】また、本実施の形態においても、上記第１
の実施の形態と同様に、駆動歯車２７の配設位置によ
り、回転伝達歯車２５に作用する力の向きが、図７に示
したように、付勢部材３３の付勢力Ｆｓａの向きと逆向
きである離脱力Ｆｔｑであるときには、回転伝達歯車２
５側のテコ部材３１による付勢力を、回転伝達歯車２５
と反対側のテコ部材３２による付勢力よりも大きし、回
転伝達歯車２５側端部での加熱ローラ２３との圧接幅Ｌ
ａが、回転伝達歯車２５と反対側端部での加熱ローラ２
３との圧接幅Ｌｂよりも広くなるようにする。この場
合、付勢部材３３と付勢部材３４を異なる付勢力のも
の、例えば、バネ圧の異なるものを使用してもよいし、
付勢部材３３と付勢部材３４を同じものを使用して、係
合溝Ｍ１、Ｍ２を上記実施の形態と逆にしても良い。Also, in the present embodiment, the first
7, the direction of the force acting on the rotation transmitting gear 25 is opposite to the direction of the urging force Fsa of the urging member 33 as shown in FIG. When the release force Ftq is
The urging force of the lever member 31 on the fifth side is transmitted to the rotation transmission gear 25.
Is greater than the urging force of the lever member 32 on the opposite side, and the pressure contact width L with the heating roller 23 at the end of the rotation transmission gear 25 side.
a is the heating roller 2 at the end opposite to the rotation transmitting gear 25;
3 is made wider than the press contact width Lb. In this case, the urging members 33 and 34 may have different urging forces, for example, may have different spring pressures.
The same urging member 33 and urging member 34 may be used, and the engagement grooves M1 and M2 may be reversed from those in the above embodiment.

【００６４】[0064]

【実施例】外径φ３０ｍｍ、肉厚１ｍｍのアルミパイプ
の加熱ローラと、外径φ３０ｍｍのゴムローラの加圧ロ
ーラを用いて、図２に示した定着部と同様の構成の定着
部を作製した。そして、加圧ローラを加熱ローラに付勢
する付勢部材としてバネを用い、回転伝達歯車側と回転
伝達歯車と反対側とでバネの強さを変えている。ただ
し、実施例では、図８に示した定着部と同様に、テコ部
材を利用して実際に加圧ローラに掛かる付勢部材の付勢
力を拡大して、加圧ローラの回転伝達歯車側に３．０ｋ
ｇｆの付勢力、回転伝達歯車と反対側に、３．５ｋｇｆ
の付勢力を加えた。EXAMPLE Using a heating roller of an aluminum pipe having an outer diameter of 30 mm and a wall thickness of 1 mm and a pressure roller of a rubber roller having an outer diameter of 30 mm, a fixing unit having the same structure as the fixing unit shown in FIG. 2 was produced. A spring is used as an urging member for urging the pressure roller against the heating roller, and the strength of the spring is changed between the rotation transmitting gear side and the side opposite to the rotation transmitting gear. However, in the embodiment, similarly to the fixing unit illustrated in FIG. 8, the urging force of the urging member actually applied to the pressure roller is enlarged by using the lever member, so that the urging force is applied to the rotation transmission gear side of the pressure roller. 3.0k
gf biasing force, 3.5 kgf on the side opposite to the rotation transmitting gear
Was added.

【００６５】なお、比較例として、３．５ｋｇｆの付勢
力を加圧ローラの両側に均等に加えた定着部を用意し
て、比較実験を行った。As a comparative example, a comparative experiment was conducted by preparing a fixing section in which a biasing force of 3.5 kgf was uniformly applied to both sides of the pressure roller.

【００６６】上記実施例と比較例の構成において、シー
ト状の面圧測定装置を用い、以下の条件で通紙を行っ
て、加圧ローラと加熱ローラとの相互圧接部の長手方向
の回転伝達歯車側と回転伝達歯車と反対側の領域で圧接
部幅を測定した。In the configuration of the above embodiment and the comparative example, the sheet is passed under the following conditions using a sheet-shaped surface pressure measuring device, and the rotation transmission in the longitudinal direction of the mutual pressure contact portion between the pressing roller and the heating roller is performed. The width of the press contact portion was measured in the region on the gear side and on the side opposite to the rotation transmitting gear.

【００６７】測定条件 記録紙送り速度：１００ｍｍ／ｓｅｃ 記録紙の種類 ：通常のコピー用紙 定着設定温度 ：１８０℃ 測定位置 ：加圧ローラ端部より３０ｍｍの両端部 通紙サイズ方向：Ａ４横 加圧ローラと加熱ローラとの相互圧接部幅は、以下のよ
うになった。なお、以下の実験結果は、３回の測定の平
均値であり、均等圧接とは、比較例のもので、不等圧接
力とは、実施例のものである。また、駆動側とは、回転
伝達歯車側を示し、非駆動側とは、回転伝達歯車と反対
側を示している。Measurement conditions Recording paper feed speed: 100 mm / sec Type of recording paper: Normal copy paper Fixing temperature: 180 ° C. Measurement position: Both ends 30 mm from the end of the pressure roller Paper passing direction: A4 horizontal pressure The width of the mutual pressure contact portion between the roller and the heating roller was as follows. The following experimental results are average values of three measurements, and the uniform pressure welding is that of the comparative example, and the unequal pressure welding force is that of the example. Further, the driving side indicates the rotation transmitting gear side, and the non-driving side indicates the side opposite to the rotation transmitting gear.

【００６８】（相互圧接幅） 測定領域 ： 駆動側 非駆動側 等圧接力（停止） ：４．２ｍｍ ４．２ｍｍ 等圧接力（駆動） ：４．９ｍｍ ３．６ｍｍ 不等圧接力（停止）：３．５ｍｍ ４．２ｍｍ 不等圧接力（駆動）：４．３ｍｍ ４．１ｍｍ 上記実験結果から分かるように、等圧接力の比較例で
は、加圧ローラを回転駆動した際、駆動側と非駆動側と
で、約１ｍｍの差が生じたの対し、不等圧接力の実施例
の場合には、駆動側と非駆動側とで、０．２ｍｍの差で
あり、実施例では、加圧ローラの回転駆動時に加圧ロー
ラの軸方向において加圧ローラと加熱ローラとの圧接幅
が略均等になっている。(Mutual pressure contact width) Measurement area: Drive side Non-drive side Constant pressure contact force (stop): 4.2 mm 4.2 mm Constant pressure contact force (drive): 4.9 mm 3.6 mm Unequal pressure contact force (stop): 3.5 mm 4.2 mm Unequal pressure contact force (drive): 4.3 mm 4.1 mm As can be seen from the above experimental results, in the comparative example of the equal pressure contact force, when the pressure roller is driven to rotate, the drive side is not driven. The difference between the drive side and the non-drive side is 0.2 mm in the case of the unequal pressure contact force, whereas the pressure roller is different in the embodiment. During the rotational drive, the pressure contact width between the pressure roller and the heating roller is substantially uniform in the axial direction of the pressure roller.

【００６９】次いで、実際に定着を行った際の定着率を
測定したところ、以下のようになった。なお、以下の実
験結果は、３回の平均である。Next, when the fixing ratio when fixing was actually performed was measured, the result was as follows. In addition, the following experimental result is an average of three times.

【００７０】（定着率） 測定領域 ： 駆動側 非駆動側 等圧接力 ：８７．２％ ７２．１％ 不等圧接力 ：８３．５％ ８４．８％ 上記実験結果から分かるように、等圧接力の比較例で
は、駆動側の定着率に比較して、非駆動側の定着率が１
５％程度低くなっているのに対して、実施例では、不等
圧接力の実施例では、駆動側と非駆動側の定着率の差が
あまりなく、良好な定着性能を示している。(Fixing ratio) Measuring area: Driving side Non-driving side Equal pressure contact force: 87.2% 72.1% Non-equal pressure contact force: 83.5% 84.8% As can be seen from the above experimental results, equal pressure welding In the comparative example of the force, the fixing rate on the non-driving side is 1 compared to the fixing rate on the driving side.
On the other hand, in the embodiment, the difference in the fixing ratio between the driving side and the non-driving side is small, and the embodiment shows good fixing performance, whereas the embodiment has an uneven pressure contact force.

【００７１】以上、本発明者によってなされた発明を好
適な実施の形態に基づき具体的に説明したが、本発明は
上記のものに限定されるものではなく、その要旨を逸脱
しない範囲で種々変更可能であることはいうまでもな
い。Although the invention made by the inventor has been specifically described based on the preferred embodiments, the present invention is not limited to the above-described embodiment, and various modifications may be made without departing from the gist of the invention. It goes without saying that it is possible.

【００７２】[0072]

【発明の効果】請求項１記載の発明の定着装置によれ
ば、駆動力伝達機構により駆動ローラを回転して、付勢
手段により従動ローラ方向に付勢されている駆動ローラ
と従動ローラとの間に搬送されてくるトナー画像の付着
された記録紙を搬送しつつ加熱してトナー画像を記録紙
に定着させる定着装置の駆動力伝達機構が、駆動ローラ
に回転駆動力を付与していない状態で、付勢手段が駆動
ローラを当該駆動ローラの長手方向において不均一な付
勢力で従動ローラ方向に付勢しているので、部品点数を
増やすことなく、かつ、簡単な構成で、駆動力伝達機構
が回転駆動力を駆動ローラに付与したとき、付勢手段に
よる付勢力と当該回転駆動力が駆動ローラに作用する従
動ローラ方向あるいは従動ローラと反対方向の力とによ
り、駆動ローラが従動ローラに圧接される圧接力を駆動
ローラの軸方向で均一にすることができ、駆動ローラと
従動ローラの長手方向における相互圧接幅を均一にする
ことができる。その結果、簡単な構成で、かつ、安価
に、記録紙に紙シワが発生することを防止することがで
きるとともに、定着性を向上させることができる。According to the fixing device of the first aspect of the present invention, the driving roller is rotated by the driving force transmitting mechanism, and the driving roller is biased in the direction of the driven roller by the biasing means. A state in which the driving force transmission mechanism of the fixing device that heats the recording paper to which the toner image is adhered and conveys the toner image while fixing the toner image onto the recording paper while conveying the recording paper does not apply a rotational driving force to the driving roller. Since the urging means urges the driving roller in the driven roller direction with uneven urging force in the longitudinal direction of the driving roller, the driving force can be transmitted without increasing the number of parts and with a simple configuration. When the mechanism applies a rotational driving force to the driving roller, the driving roller is driven by the urging force of the urging means and the force of the rotating driving force acting on the driving roller in the driven roller direction or in the direction opposite to the driven roller. The pressing force is pressed against the roller can be made uniform in the axial direction of the drive roller, the mutual pressure contact width in the longitudinal direction of the driving roller and the driven roller can be made uniform. As a result, it is possible to prevent the occurrence of paper wrinkles on the recording paper with a simple configuration and at a low cost, and to improve the fixability.

【００７３】請求項２記載の発明の定着装置によれば、
付勢手段が、駆動力伝達機構が駆動ローラに回転駆動力
を付与していない状態で、駆動ローラの駆動力伝達機構
側の端部を、駆動ローラの駆動力伝達機構と反対側の端
部よりも小さい付勢力で付勢するので、安価な構成で、
駆動力伝達機構が回転駆動力を駆動ローラに付与したと
き、駆動ローラが従動ローラに圧接される圧接力を軽減
しつつ、付勢手段による付勢力と当該回転駆動力が駆動
ローラに作用する従動ローラ方向の力とにより、駆動ロ
ーラが従動ローラに圧接される圧接力を駆動ローラの軸
方向（長手方向）で均一にして、駆動ローラと従動ロー
ラを長手方向において均一な相互圧接幅で圧接させるこ
とができ、安価に、記録紙に紙シワが発生することを防
止しつつ、定着性を向上させることができるとともに、
駆動ローラと従動ローラの耐久性を向上させることがで
きる。According to the fixing device of the second aspect of the present invention,
When the urging means does not apply the rotational driving force to the driving roller, the driving force transmitting mechanism applies an end of the driving roller on the driving force transmitting mechanism side to an end of the driving roller opposite to the driving force transmitting mechanism. Because it is biased with a smaller biasing force, it is inexpensive configuration,
When the driving force transmission mechanism applies a rotational driving force to the driving roller, the urging force of the urging means and the rotational driving force acting on the driving roller are reduced while reducing the pressing force of the driving roller pressing against the driven roller. Due to the force in the roller direction, the pressing force at which the driving roller is pressed against the driven roller is made uniform in the axial direction (longitudinal direction) of the driving roller, and the driving roller and the driven roller are pressed against each other with a uniform mutual pressing width in the longitudinal direction. It is possible to improve the fixing property while preventing paper wrinkles from occurring on the recording paper at a low cost,
The durability of the driving roller and the driven roller can be improved.

【００７４】請求項３記載の発明の定着装置によれば、
付勢手段として、少なくとも、駆動ローラの駆動力伝達
機構側の端部に配設されて駆動ローラを従動ローラ方向
に付勢する駆動側バネと、駆動ローラの駆動力伝達機構
と反対側の端部に配設されて駆動ローラを従動ローラ方
向に付勢する非駆動側バネと、を備え、駆動側バネと非
駆動側バネとでバネ種類の異なるバネを使用しているの
で、より一層簡単な構造で、かつ、安価に記録紙に紙シ
ワが発生することを防止することができるとともに、定
着性を向上させることができる。According to the fixing device of the third aspect of the present invention,
As the urging means, at least a driving-side spring disposed at an end of the driving roller on the driving force transmission mechanism side to urge the driving roller in the driven roller direction, and an end opposite to the driving force transmission mechanism of the driving roller. And a non-drive-side spring that urges the drive roller in the direction of the driven roller, and a different spring type is used for the drive-side spring and the non-drive-side spring. It is possible to prevent paper wrinkles from occurring on the recording paper with a simple structure and at a low cost, and to improve the fixing property.

【００７５】請求項４記載の発明の定着装置によれば、
付勢手段を、所定の支点を中心として回動可能に配設さ
れ駆動ローラを所定の作用点で支持するテコ部材と、テ
コ部材の所定の力点に係合してテコ部材の作用点に支持
されている駆動ローラを従動ローラ方向に付勢する付勢
部材と、を備えたテコ式付勢機構が、駆動ローラの駆動
力伝達機構側の端部と駆動力伝達機構と反対側の端部に
それぞれ設けられたものとしているので、簡単な構造
で、かつ、安価に、記録紙に紙シワが発生することを防
止することができるとともに、定着性を向上させること
ができる。According to the fixing device of the fourth aspect of the present invention,
A lever member rotatably disposed about a predetermined fulcrum as a center and supporting the drive roller at a predetermined point of application; and a biasing means supported at the point of application of the lever member by engaging the predetermined force point of the lever member. And a biasing member for biasing the driven roller in the driven roller direction, the lever type biasing mechanism having an end on the driving force transmission mechanism side of the driving roller and an end on the side opposite to the driving force transmission mechanism. , Respectively, so that it is possible to prevent the occurrence of paper wrinkles on the recording paper with a simple structure and at a low cost, and to improve the fixing property.

【００７６】請求項５記載の発明の定着装置によれば、
駆動力伝達機構側のテコ式付勢機構の付勢部材と駆動力
伝達機構と反対側のテコ式付勢機構の付勢部材として、
同じ種類の付勢部材を使用し、テコ部材の異なる力点位
置に係合させているので、付勢部材を共通化して、部品
種類を減らすことができ、より一層安価に記録紙に紙シ
ワが発生することを防止することができるとともに、定
着性を向上させることができる。According to the fixing device of the fifth aspect of the present invention,
As the urging member of the lever-type urging mechanism on the driving force transmission mechanism side and the urging member of the lever-type urging mechanism on the opposite side to the driving force transmission mechanism,
Since the same type of urging member is used and the lever member is engaged at different force point positions, the urging member can be used in common, and the number of component types can be reduced. It is possible to prevent the occurrence and to improve the fixing property.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の定着装置の第１の実施の形態を適用し
た定着部の適用された電子写真式記録装置の正面概略構
成図。FIG. 1 is a schematic front view of an electrophotographic recording apparatus to which a fixing unit according to a first embodiment of the present invention is applied;

【図２】図１の定着部の拡大斜視図。FIG. 2 is an enlarged perspective view of a fixing unit of FIG.

【図３】図２の加圧ローラと加熱ローラの圧接状態を示
す側面図。FIG. 3 is a side view showing a pressure contact state between the pressure roller and the heating roller in FIG. 2;

【図４】図２の加圧ローラと加熱ローラの非回転時の圧
接部幅を示す図。FIG. 4 is a diagram illustrating a width of a pressure contact portion of the pressure roller and the heating roller in FIG. 2 when the roller is not rotating;

【図５】図２の加圧ローラに作用する駆動歯車の押圧力
と付勢部材の付勢力との関係を示す図。FIG. 5 is a diagram showing a relationship between a pressing force of a driving gear acting on a pressing roller of FIG. 2 and an urging force of an urging member.

【図６】図２の加圧ローラと加熱ローラの回転時の圧接
部幅を示す図。FIG. 6 is a diagram showing the width of a pressure contact portion when the pressure roller and the heating roller of FIG. 2 rotate.

【図７】図２の加圧ローラに作用する駆動歯車の離脱力
と付勢部材の付勢力との関係を示す図。FIG. 7 is a diagram illustrating a relationship between a separating force of a driving gear acting on the pressure roller of FIG. 2 and an urging force of an urging member;

【図８】本発明の定着装置の第２の実施の形態を適用し
た定着部の拡大斜視図。FIG. 8 is an enlarged perspective view of a fixing unit to which a second embodiment of the fixing device according to the invention is applied.

【図９】図８のテコ部材部分の拡大正面図。FIG. 9 is an enlarged front view of the lever member of FIG. 8;

【図１０】従来の定着部の拡大斜視図。FIG. 10 is an enlarged perspective view of a conventional fixing unit.

【図１１】図１０の加圧ローラと加熱ローラの圧接状態
を示す側面図。FIG. 11 is a side view showing a pressure contact state between the pressure roller and the heating roller in FIG. 10;

【図１２】図１０の加圧ローラと加熱ローラの非回転時
の圧接部幅を示す図。FIG. 12 is a diagram showing the width of the pressure contact portion when the pressure roller and the heating roller in FIG. 10 are not rotating.

【図１３】図１０の加圧ローラに作用する駆動歯車の離
脱力とバネの付勢力との関係を示す図。FIG. 13 is a diagram showing a relationship between a separating force of a driving gear and a biasing force of a spring acting on a pressure roller of FIG. 10;

【図１４】図１０の加圧ローラに作用する駆動歯車の押
圧力とバネの付勢力との関係を示す図。FIG. 14 is a diagram showing a relationship between a pressing force of a drive gear acting on a pressure roller of FIG. 10 and a biasing force of a spring.

【図１５】図１０の加圧ローラと加熱ローラの回転時に
駆動歯車の離脱力が作用したときの圧接部幅を示す図。FIG. 15 is a diagram illustrating a width of a pressure contact portion when a separating force of a drive gear is applied when the pressing roller and the heating roller of FIG. 10 rotate.

【符号の説明】[Explanation of symbols]

１０ 電子写真式記録装置 １１ 本体筐体 １２ 感光体 １３ 帯電部 １４ 露光部 １５ 現像部 １６ 転写部 １７ クリーニング部 １８ 記録紙 １９ 記録紙カセット ２０ 記録紙搬送機構 ２１ 定着部 ２２ 排紙トレー ２３ 加熱ローラ ２４ 加圧ローラ ２４ａ ローラ軸 ２５ 回転伝達歯車 ２６ａ、２６ｂ 付勢部材 ２７ 駆動歯車 ３０ 定着部 ３１、３２ テコ部材 ３３、３４ 付勢部材 ３５ 支点軸 Ｍ１、Ｍ２ 係合溝 REFERENCE SIGNS LIST 10 electrophotographic recording device 11 main body housing 12 photoreceptor 13 charging unit 14 exposing unit 15 developing unit 16 transfer unit 17 cleaning unit 18 recording paper 19 recording paper cassette 20 recording paper transport mechanism 21 fixing unit 22 discharge tray 23 heating roller Reference Signs List 24 pressure roller 24a roller shaft 25 rotation transmitting gear 26a, 26b urging member 27 drive gear 30 fixing unit 31, 32 lever member 33, 34 urging member 35 fulcrum shaft M1, M2 engagement groove

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】回転可能に支持された従動ローラと、前記
従動ローラ方向に移動可能にかつ回転可能に支持された
駆動ローラと、前記駆動ローラを前記従動ローラ方向に
付勢して前記駆動ローラを前記従動ローラに圧接させる
付勢手段と、前記駆動ローラの長手方向一方側の端部に
係合して前記駆動ローラに所定の回転駆動力を付与して
前記駆動ローラを回転駆動する駆動力伝達機構と、を有
し、前記従動ローラと前記駆動ローラのうち少なくとも
一方のローラが加熱されて、前記駆動力伝達機構により
前記駆動ローラが回転され、前記従動ローラと前記駆動
ローラの間に搬送されてくるトナー画像の付着された記
録紙を前記従動ローラと前記駆動ローラで狭持して搬送
しつつ加熱して前記トナー画像を前記記録紙に定着させ
る定着装置であって、前記付勢手段は、前記駆動力伝達
機構が前記駆動ローラに前記回転駆動力を付与していな
い状態で、前記駆動ローラを当該駆動ローラの長手方向
において不均一な付勢力で前記従動ローラ方向に付勢す
ることを特徴とする定着装置。A driven roller rotatably supported; a driving roller movably supported in the driven roller direction and rotatably supported; and a driving roller biasing the driving roller in the driven roller direction. Urging means for pressing the driven roller against the driven roller; and a driving force for engaging the one end in the longitudinal direction of the driving roller to apply a predetermined rotational driving force to the driving roller to rotationally drive the driving roller. A driving mechanism, wherein at least one of the driven roller and the driving roller is heated, the driving roller is rotated by the driving force transmitting mechanism, and is conveyed between the driven roller and the driving roller. A fixing device for fixing the toner image onto the recording paper by heating the recording paper having the toner image attached thereto while being conveyed while being held between the driven roller and the driving roller. The urging means may move the driving roller in the driven roller direction with a non-uniform urging force in a longitudinal direction of the driving roller in a state where the driving force transmission mechanism does not apply the rotational driving force to the driving roller. A fixing device characterized in that the fixing device is urged toward the fixing device. 【請求項２】前記付勢手段は、前記駆動力伝達機構が前
記駆動ローラに前記回転駆動力を付与していない状態
で、前記駆動ローラの前記駆動力伝達機構側の端部を、
前記駆動ローラの前記駆動力伝達機構と反対側の端部よ
りも小さい付勢力で前記駆動ローラを付勢することを特
徴とする請求項１記載の定着装置。2. The urging means, when the driving force transmitting mechanism does not apply the rotational driving force to the driving roller, causes the driving roller to move an end of the driving roller closer to the driving force transmitting mechanism.
2. The fixing device according to claim 1, wherein the driving roller is urged by an urging force smaller than an end of the driving roller opposite to the driving force transmission mechanism. 3. 【請求項３】前記付勢手段は、少なくとも、前記駆動ロ
ーラの前記駆動力伝達機構側の端部に配設されて前記駆
動ローラを前記従動ローラ方向に付勢する駆動側バネ
と、前記駆動ローラの前記駆動力伝達機構と反対側の端
部に配設されて前記駆動ローラを前記従動ローラ方向に
付勢する非駆動側バネと、を備え、前記駆動側バネと前
記非駆動側バネとでバネの種類が異なることを特徴とす
る請求項１または請求項２記載の定着装置。3. The driving device according to claim 1, wherein the urging means is disposed at least at an end of the driving roller on the driving force transmission mechanism side to urge the driving roller toward the driven roller. A non-drive-side spring disposed at an end of the roller opposite to the drive-force transmitting mechanism and biasing the drive roller in the driven roller direction; andthe drive-side spring and the non-drive-side spring. 3. The fixing device according to claim 1, wherein the type of spring is different. 【請求項４】前記付勢手段は、所定の支点を中心として
回動可能に配設され前記駆動ローラを所定の作用点で支
持するテコ部材と、前記テコ部材の所定の力点に係合し
て前記テコ部材の前記作用点に支持されている前記駆動
ローラを前記従動ローラ方向に付勢する付勢部材と、を
備えたテコ式付勢機構が、前記駆動ローラの前記駆動力
伝達機構側の端部と前記駆動力伝達機構と反対側の端部
にそれぞれ設けられていることを特徴とする請求項１ま
たは請求項２に記載の定着装置。4. The lever means is provided rotatably about a predetermined fulcrum and supports the drive roller at a predetermined point of action, and engages with a predetermined force point of the lever member. A biasing member for biasing the drive roller supported by the point of action of the lever member in the direction of the driven roller, wherein the lever-type biasing mechanism is provided on the drive force transmission mechanism side of the drive roller. The fixing device according to claim 1, wherein the fixing device is provided at an end of the fixing device and an end opposite to the driving force transmission mechanism. 【請求項５】前記駆動力伝達機構側の前記テコ式付勢機
構の前記付勢部材と前記駆動力伝達機構と反対側の前記
テコ式付勢機構の前記付勢部材は、同じ種類の付勢部材
であり、前記テコ部材の異なる力点位置に係合している
ことを特徴とする請求項４記載の定着装置。5. The same urging member of the lever-type urging mechanism of the lever-type urging mechanism on the side of the driving force transmitting mechanism and the lever-type urging mechanism on the side opposite to the driving force transmitting mechanism. 5. The fixing device according to claim 4, wherein the fixing device is a biasing member, and is engaged with different force points of the lever member.
JP9526397A 1997-03-28 1997-03-28 Fixing device Pending JPH10274900A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9526397A JPH10274900A (en) 1997-03-28 1997-03-28 Fixing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9526397A JPH10274900A (en) 1997-03-28 1997-03-28 Fixing device

Publications (1)

Publication Number Publication Date
JPH10274900A true JPH10274900A (en) 1998-10-13

Family

ID=14132888

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9526397A Pending JPH10274900A (en) 1997-03-28 1997-03-28 Fixing device

Country Status (1)

Country Link
JP (1) JPH10274900A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015114394A (en) * 2013-12-09 2015-06-22 富士ゼロックス株式会社 Fixing device and image forming apparatus
JP2016224373A (en) * 2015-06-03 2016-12-28 京セラドキュメントソリューションズ株式会社 Fixing device and image forming apparatus including the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015114394A (en) * 2013-12-09 2015-06-22 富士ゼロックス株式会社 Fixing device and image forming apparatus
JP2016224373A (en) * 2015-06-03 2016-12-28 京セラドキュメントソリューションズ株式会社 Fixing device and image forming apparatus including the same

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