JP6143900B2 - Image heating device - Google Patents

Image heating device Download PDF

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JP6143900B2
JP6143900B2 JP2016020269A JP2016020269A JP6143900B2 JP 6143900 B2 JP6143900 B2 JP 6143900B2 JP 2016020269 A JP2016020269 A JP 2016020269A JP 2016020269 A JP2016020269 A JP 2016020269A JP 6143900 B2 JP6143900 B2 JP 6143900B2
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belt
movable member
rotating body
facing portion
surface facing
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JP2016066107A5 (en
JP2016066107A (en
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英生 太田
英生 太田
遠藤 昭孝
昭孝 遠藤
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Canon Inc
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Canon Inc
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Description

本発明は、筒状の可撓性回転体を有し、記録材に形成された画像を加熱する像加熱装置に関する。特に、電子写真記録技術を用い記録材にトナー像を形成する画像形成装置に搭載する定着器として用いれば好適な像加熱装置に関する。   The present invention relates to an image heating apparatus that has a cylindrical flexible rotating body and heats an image formed on a recording material. In particular, the present invention relates to an image heating apparatus suitable for use as a fixing device mounted on an image forming apparatus that forms a toner image on a recording material using electrophotographic recording technology.

定着器に代表される可撓性の回転体を用いた像加熱装置では、しばしば、回転体の回転中に回転体が母線方向に移動する寄り移動が課題となる。この寄り移動を規制するため、回転体の端面に対向する位置に回転体の寄りを規制する規制部材を設けることがある。特許文献1には、このような規制部材を有する像加熱装置が開示されている。   In an image heating apparatus using a flexible rotating body typified by a fixing device, there is often a problem that the rotating body moves in the generatrix direction while the rotating body rotates. In order to restrict this shifting, a regulating member that regulates the shifting of the rotating body may be provided at a position facing the end face of the rotating body. Patent Document 1 discloses an image heating apparatus having such a regulating member.

特開2011−248285号JP2011-248285A

ところで、近年の画像形成装置は高速化や省エネ化が求められている。この要求に伴い、回転体の回転速度も増大し、回転体が寄り規制部材に接触した時の回転体端面に掛る圧力が大きくなっている。また、回転体の熱容量を抑えるため、回転体の薄肉化や小径化も進んでいる。このため、回転体端面に掛る単位面積当たりの圧力が大きくなっている。また、近年の画像形成装置は長寿命化も求められており、これに伴い、回転体端面が寄り規制部材に摺擦する時間も長くなっている。このように、画像形成装置に求められる性能アップに伴い、回転体端面が削れ易く、回転体の耐久性が十分でない状況になってきており、回転体の寄り移動を規制する機構の更なる改善が求められている。   By the way, recent image forming apparatuses are required to increase speed and save energy. With this requirement, the rotational speed of the rotating body also increases, and the pressure applied to the end face of the rotating body when the rotating body is in contact with the regulating member is increased. In addition, in order to suppress the heat capacity of the rotating body, the rotating body is also made thinner and smaller in diameter. For this reason, the pressure per unit area applied to the rotating body end face is increased. In addition, in recent years, the image forming apparatus is also required to have a long life, and accordingly, the time for the end face of the rotating body to shift and rub against the regulating member is also increased. As described above, with the improvement in performance required for the image forming apparatus, the end face of the rotating body is likely to be scraped, and the durability of the rotating body has become insufficient, and further improvement of the mechanism that restricts the displacement of the rotating body is achieved. Is required.

本発明はこのような課題に鑑みなされたものであり、その目的は、可撓性回転体の耐久性低下を改善できる像加熱装置を提供することにある。   The present invention has been made in view of such problems, and an object of the present invention is to provide an image heating apparatus that can improve the decrease in durability of a flexible rotating body.

上述の課題を解決するための本発明は、画像を担持する記録材と接触しつつ回転する筒状の可撓性回転体であって、張架されていない可撓性回転体を有し、画像を担持する記録材を搬送しつつ加熱する像加熱装置において、前記回転体の母線方向端部で前記回転体の内面に対向する内面対向部と、前記回転体の端面に対向する端面対向部と、を有し、前記回転体前記母線方向へ寄り移動して前記端面対向部が前記回転体に押されると、前記端面対向部の移動に伴い前記内面対向部が記録材の搬送方向上流に向かって移動し、前記回転体の内面が前記内面対向部に押されることを特徴とする。 The present invention for solving the above-described problems is a cylindrical flexible rotating body that rotates while contacting an image-carrying recording material, and has a flexible rotating body that is not stretched, In an image heating apparatus that heats a recording material carrying an image while conveying the recording material, an inner surface facing portion that faces the inner surface of the rotating body at an end portion in a generatrix direction of the rotating body, and an end surface facing portion that faces the end surface of the rotating body When have, when the rotating body is the end surface facing portion moves deviation to the generatrix direction is pushed to the rotary member, said inner surface facing portion along with the movement of the end surface facing portion conveying direction upstream of the recording medium moves toward the inner surface of the rotating body is equal to or pressed into the inner surface facing portion.

本発明によれば、可撓性回転体の端面の削れを抑制できる。   According to the present invention, it is possible to suppress scraping of the end face of the flexible rotating body.

画像形成装置の断面図Cross section of image forming apparatus 像加熱装置の断面図Cross section of image heating device 像加熱装置内部の斜視図及び断面図Perspective view and sectional view of the inside of the image heating apparatus 実施例1の補正機構の斜視図及び断面図The perspective view and sectional drawing of the correction mechanism of Example 1 可動部材及び保持部材の斜視図Perspective view of movable member and holding member 補正機構の断面図Cross section of correction mechanism 補正機構の動作説明図Operation explanatory diagram of the correction mechanism ベルトに掛る力を説明する図Illustration explaining the force applied to the belt 可動部材に掛る力を説明する図The figure explaining the force applied to a movable member 実施例2の可動部材及び保持部材の斜視図The perspective view of the movable member of Example 2, and a holding member. 補正機構の断面図Cross section of correction mechanism 補正機構の動作説明図Operation explanatory diagram of the correction mechanism 実施例3の像加熱装置の斜視図The perspective view of the image heating apparatus of Example 3. 可動部材及び保持部材の斜視図Perspective view of movable member and holding member リンク部材の斜視図及び補正機構の断面図Perspective view of link member and sectional view of correction mechanism 補正機構の動作説明図Operation explanatory diagram of the correction mechanism 実施例4の補正機構の斜視図及び上面図The perspective view and top view of the correction mechanism of Example 4 補正機構の動作説明図Operation explanatory diagram of the correction mechanism 実施例5の補正機構の斜視図The perspective view of the correction mechanism of Example 5

(実施例1)
図1は像加熱装置である定着装置1を搭載する電子写真記録方式のプリンタ(画像形成装置)100の断面図である。画像形成部101において4色のトナー像を重畳して形成したフルカラートナー画像は、給紙部から給紙された記録材Pに転写部102で転写される。記録材Pに転写されたトナー画像は、定着装置1で記録材に加熱定着される。定着済みの記録材Pは排紙トレイ103に排出される。両面プリントの場合は、記録材の片面にトナー画像を転写及び定着した後、記録材をスイッチバックさせて両面搬送路104に搬送し、記録材の二面目に一面目処理時と同様の動作で画像形成する。これらの画像形成動作は周知なので詳細な説明は割愛する。
Example 1
FIG. 1 is a cross-sectional view of an electrophotographic printer 100 (image forming apparatus) equipped with a fixing device 1 which is an image heating device. The full color toner image formed by superimposing the four color toner images in the image forming unit 101 is transferred by the transfer unit 102 to the recording material P fed from the paper feeding unit. The toner image transferred to the recording material P is heated and fixed to the recording material by the fixing device 1. The fixed recording material P is discharged to the paper discharge tray 103. In the case of double-sided printing, after transferring and fixing the toner image on one side of the recording material, the recording material is switched back and conveyed to the double-sided conveyance path 104, and the same operation as the first side processing is performed on the second side of the recording material. Image formation. Since these image forming operations are well known, a detailed description thereof will be omitted.

図2は定着装置1の概要を示す断面図、図3は定着装置の内部の斜視図(図3(a))と定着装置を記録材排出側から見た時の定着装置内部の断面図(図3(b))である。尚、矢印Sは記録材Pの搬送方向を、破線Xは定着装置の長手方向中央を夫々示している。本例の定着装置は、破線Xが記録材Pの搬送基準となっている。記録材Pは、そのサイズに拘らず、記録材幅方向中央を破線Xに合わせて搬送される。   2 is a cross-sectional view showing an outline of the fixing device 1. FIG. 3 is a perspective view of the inside of the fixing device (FIG. 3A) and a cross-sectional view of the inside of the fixing device when the fixing device is viewed from the recording material discharge side. FIG. 3B). The arrow S indicates the conveyance direction of the recording material P, and the broken line X indicates the center in the longitudinal direction of the fixing device. In the fixing device of this example, the broken line X is a conveyance reference of the recording material P. Regardless of the size of the recording material P, the recording material P is conveyed with the center of the recording material width direction aligned with the broken line X.

定着装置1は、加熱ユニット2、加熱ユニット2と共に定着ニップ部を形成するローラ3、定着処理済みの記録材を搬送する搬送ローラ4等を有する。加熱ユニット2は、筒状の可撓性回転体(筒状のベルト、筒状のフィルム)9(以下、ベルト9と称する)、ベルト9の内面に接触しベルトを加熱するヒータ5を有する。更に、加熱ユニット2は、ヒータ5を保持するヒータホルダ6、加熱ユニットの剛性を保つためのステー8、等を有する。本例では、ヒータ5、ヒータホルダ6、及びステー8が、ベルト9の内面にベルトの母線方向に亘って接触するバックアップユニットを構成している。ベルト9の内面には張架ローラはなく、ベルト9は張架されていない構成である。ローラ3はゴム層を有し、ベルト9を介してバックアップユニットと共に記録材を挟持搬送する定着ニップ部Nを形成する。また、ローラ3は不図示のモータによりギア61を介して駆動されており、ベルト9はローラ3の回転に従動して回転する。   The fixing device 1 includes a heating unit 2, a roller 3 that forms a fixing nip portion together with the heating unit 2, a conveyance roller 4 that conveys a recording material that has been subjected to a fixing process, and the like. The heating unit 2 includes a cylindrical flexible rotating body (cylindrical belt, cylindrical film) 9 (hereinafter referred to as a belt 9), and a heater 5 that contacts the inner surface of the belt 9 and heats the belt. Furthermore, the heating unit 2 includes a heater holder 6 that holds the heater 5, a stay 8 that maintains the rigidity of the heating unit, and the like. In this example, the heater 5, the heater holder 6, and the stay 8 constitute a backup unit that contacts the inner surface of the belt 9 in the direction of the bus line of the belt. There is no tension roller on the inner surface of the belt 9, and the belt 9 is not stretched. The roller 3 has a rubber layer and forms a fixing nip portion N for nipping and conveying the recording material together with the backup unit via the belt 9. The roller 3 is driven by a motor (not shown) via a gear 61, and the belt 9 rotates following the rotation of the roller 3.

図3(a)に示すように、定着装置のフレーム13にはローラ3の軸受を装着するためのU字形状の凹部が設けられており、ローラ3の軸端部に設けられた二つの軸受はこの凹部に保持されている。バックアップユニットの両端部にはベルト9の寄り移動を補正する補正機構10L及び10Rが設けられている。この位置に補正機構を配置することにより、補正機構10L及び10Rは、ベルト9の端面と対向する。補正機構10L及び10Rは、後述する保持部材12を有している。この保持部材12に設けた溝部12f(図4(a)参照)を、ローラ3同様、フレーム13のU字形状の凹部に装着することにより、加熱ユニット2がフレーム13に保持される。保持部材12の上面12c(図4(a)参照)には圧縮バネ7により圧力が付与されている。このバネ7の圧力により、保持部材12、ステー8、及びヒータホルダ6を介して、ヒータ5がローラ3に向って付勢される。これにより、ローラ3のゴム層が圧縮され、ベルト9を介してバックアップユニットとローラ3が定着ニップ部Nを形成する。トナー画像を担持する記録材Pは、ベルト9と接触しつつ定着ニップ部Nで挟持搬送される。この期間にトナー画像はベルト9を介してヒータ5で加熱され、記録材Pに定着される。   As shown in FIG. 3A, the frame 13 of the fixing device is provided with a U-shaped recess for mounting the bearing of the roller 3, and two bearings provided at the shaft end of the roller 3. Is held in this recess. Correcting mechanisms 10L and 10R for correcting the shift of the belt 9 are provided at both ends of the backup unit. By arranging the correction mechanism at this position, the correction mechanisms 10L and 10R face the end surface of the belt 9. The correction mechanisms 10L and 10R have a holding member 12 described later. The heating unit 2 is held by the frame 13 by mounting the groove 12 f (see FIG. 4A) provided in the holding member 12 in the U-shaped concave portion of the frame 13 like the roller 3. Pressure is applied to the upper surface 12 c (see FIG. 4A) of the holding member 12 by the compression spring 7. Due to the pressure of the spring 7, the heater 5 is biased toward the roller 3 through the holding member 12, the stay 8, and the heater holder 6. As a result, the rubber layer of the roller 3 is compressed, and the backup unit and the roller 3 form the fixing nip portion N via the belt 9. The recording material P carrying the toner image is nipped and conveyed at the fixing nip portion N while being in contact with the belt 9. During this period, the toner image is heated by the heater 5 via the belt 9 and fixed on the recording material P.

本例のベルト9は、耐熱樹脂製の基層(具体的な材質はポリイミド)と、フッ素樹脂の表面層と、基層と表面層の間に設けたゴム層(シリコーンゴム層)を有するものである。基層の材質はステンレスやニッケル等の金属でもよく、必要に応じてゴム層を省いた構成でもよい。   The belt 9 of this example has a heat-resistant resin base layer (specific material is polyimide), a fluororesin surface layer, and a rubber layer (silicone rubber layer) provided between the base layer and the surface layer. . The material of the base layer may be a metal such as stainless steel or nickel, and may be configured without the rubber layer as necessary.

ヒータ5は図3(b)に示すように定着装置の長手方向(ベルト9の母線方向)に細長い形状である。ヒータ5はセラミック基板上に発熱抵抗体が印刷されたセラミックヒータであり、電力供給用のコネクタ62を介して電力が供給される。ヒータ5の温度は不図示の温度検出素子でモニタされており、ヒータ5は温度検出素子の検出温度が目標温度を保つように電力制御される。ヒータホルダ6はLCP(Liquid Crystal Polymer)やPPS(Polyphenylene Sulfide)等の耐熱樹脂を成型したものである。ヒータホルダ6にはヒータ5を嵌めこむための溝が設けてあり、この溝にヒータ5を嵌めこむことによりヒータ5を長手方向に亘って保持している。ステー8は断面がU字形状で、材質は金属(本例では鉄)であり、ホルダ6に対して長手方向に亘って接触し、ホルダ6を補強している。   As shown in FIG. 3B, the heater 5 has an elongated shape in the longitudinal direction of the fixing device (in the bus line direction of the belt 9). The heater 5 is a ceramic heater in which a heating resistor is printed on a ceramic substrate, and electric power is supplied through a power supply connector 62. The temperature of the heater 5 is monitored by a temperature detection element (not shown), and the power of the heater 5 is controlled so that the temperature detected by the temperature detection element maintains the target temperature. The heater holder 6 is formed by molding a heat-resistant resin such as LCP (Liquid Crystal Polymer) or PPS (Polyphenylene Sulfide). The heater holder 6 is provided with a groove for fitting the heater 5, and the heater 5 is held in the longitudinal direction by fitting the heater 5 into the groove. The stay 8 has a U-shaped cross section and is made of metal (iron in this example). The stay 8 is in contact with the holder 6 in the longitudinal direction and reinforces the holder 6.

次に、ベルト9の寄り移動を補正する補正機構10R及び10Lについて、図4〜図8を用いて説明する。なお、補正機構10R及び10Lは、記録材Pの搬送基準Xを基準に略線対称な形状なので、補正機構10Rのみの説明を行い、補正機構10Lの説明は省略する。   Next, correction mechanisms 10R and 10L that correct the shift of the belt 9 will be described with reference to FIGS. Since the correction mechanisms 10R and 10L are substantially line symmetrical with respect to the conveyance reference X of the recording material P, only the correction mechanism 10R will be described, and description of the correction mechanism 10L will be omitted.

図4(a)は補正機構10Rの斜視図、図4(b)は補正機構10Rを記録材の搬送方向上流から見た時の断面図である。また、図5(a)は後述する可動部材11の斜視図、図5(b)は可動部材11を保持する保持部材12の斜視図である。更に、図6は補正機構10Rを図4(b)のV1方向から見た時の図、図7及び図8は補正機構によるベルトの姿勢を補正するメカニズムを説明する図である。   4A is a perspective view of the correction mechanism 10R, and FIG. 4B is a cross-sectional view of the correction mechanism 10R as viewed from the upstream side in the recording material conveyance direction. FIG. 5A is a perspective view of the movable member 11 described later, and FIG. 5B is a perspective view of the holding member 12 that holds the movable member 11. Further, FIG. 6 is a view when the correction mechanism 10R is viewed from the direction V1 in FIG. 4B, and FIGS. 7 and 8 are views for explaining a mechanism for correcting the posture of the belt by the correction mechanism.

補正機構10Rは、可動部材11と、可動部材11を保持する保持部材12、及び可動部材11を付勢する圧縮バネ(付勢部材)14で構成されている。保持部材12は、上述したように、定着装置のフレーム13のU字形状の凹部に嵌め込まれている。これにより、ヒータ長手方向における保持部材12の位置、及び記録材搬送方向における保持部材12の位置が略決められている。保持部材12は、バネ7によりローラ3に向って付勢されているので、略固定された状態となっている。   The correction mechanism 10 </ b> R includes a movable member 11, a holding member 12 that holds the movable member 11, and a compression spring (biasing member) 14 that biases the movable member 11. As described above, the holding member 12 is fitted into the U-shaped recess of the frame 13 of the fixing device. Thereby, the position of the holding member 12 in the heater longitudinal direction and the position of the holding member 12 in the recording material conveyance direction are substantially determined. Since the holding member 12 is biased toward the roller 3 by the spring 7, it is in a substantially fixed state.

可動部材11は保持部材12に対して移動可能に係合する部品である。可動部材11は、ステー8の長手方向端部に設けられた切欠き部に接しており、可動部材11の上部と保持部材12の間には僅かな隙間が設けられている。図4(a)に示すように、可動部材11は、ベルト9の端面に対向する端面対向部11aを有する。ベルト9が、その母線方向へ寄り移動すると、ベルト9の端面は端面対向部11aに突き当たる。また、可動部材11は、ベルト9の端部の内面に対向する内面対向部11cを有する。ベルト9内面と内面対向部11cの間には若干のクリアランスが設けられており、内面対向部11cはベルト回転時のベルト9の内面をガイドする機能も有する。   The movable member 11 is a component that is movably engaged with the holding member 12. The movable member 11 is in contact with a notch provided at the longitudinal end of the stay 8, and a slight gap is provided between the upper portion of the movable member 11 and the holding member 12. As shown in FIG. 4A, the movable member 11 has an end surface facing portion 11 a that faces the end surface of the belt 9. When the belt 9 moves closer to the generatrix direction, the end surface of the belt 9 abuts against the end surface facing portion 11a. The movable member 11 has an inner surface facing portion 11 c that faces the inner surface of the end portion of the belt 9. A slight clearance is provided between the inner surface of the belt 9 and the inner surface facing portion 11c, and the inner surface facing portion 11c also has a function of guiding the inner surface of the belt 9 when the belt rotates.

図5(a)に示すように、可動部材11は、ヒータ長手方向に対して斜めの方向に延びた凸部11bを有する。一方、図5(b)に示すように、保持部材12は、ヒータ長手方向に対して斜めの方向に延びた凹部(ガイド部)12bを有する。可動部材11と保持部材12を組み合わせると、保持部材12の凹部12bに可動部材11の凸部11bが収まる。この構成により、可動部材11は保持部材12の凹部12bに沿ってスライド可能に保持される。14は可動部材11を保持部材12の座面12aから離れる方向へ付勢する圧縮バネである。   As shown in FIG. 5A, the movable member 11 has a convex portion 11b extending in an oblique direction with respect to the heater longitudinal direction. On the other hand, as shown in FIG. 5B, the holding member 12 has a concave portion (guide portion) 12b extending in an oblique direction with respect to the heater longitudinal direction. When the movable member 11 and the holding member 12 are combined, the convex portion 11 b of the movable member 11 is accommodated in the concave portion 12 b of the holding member 12. With this configuration, the movable member 11 is slidably held along the recess 12 b of the holding member 12. Reference numeral 14 denotes a compression spring that urges the movable member 11 in a direction away from the seating surface 12 a of the holding member 12.

次に、図6〜8を用いて補正機構10の動作説明を行う。図6及び図7(a)はベルト9の端面が端面対向部11aに当接していない時の補正機構の状態を示す。ローラ3の回転によりベルト9が従動回転している時、ヒータ5よりもベルト回転方向上流側の領域において、ベルト9は可動部材11の内面対向部11cと接触している。一方、ヒータ5よりもベルト回転方向下流側の領域において両者は離間している。   Next, the operation of the correction mechanism 10 will be described with reference to FIGS. 6 and 7A show the state of the correction mechanism when the end face of the belt 9 is not in contact with the end face facing portion 11a. When the belt 9 is driven to rotate by the rotation of the roller 3, the belt 9 is in contact with the inner surface facing portion 11 c of the movable member 11 in the region upstream of the heater 5 in the belt rotation direction. On the other hand, they are separated from each other in the region downstream of the heater 5 in the belt rotation direction.

ベルト9の端面が端面対向部11aに接触していない時、バネ14により付勢さている可動部材11は、保持部材12内部において最も座面12aから離れた位置に位置する。この時、可動部材11の凸部11bは保持部材12の第1ストッパー部12dに突き当たり、バネ14によって付勢されていても可動部材11は移動を規制され、位置が決められている。   When the end surface of the belt 9 is not in contact with the end surface facing portion 11a, the movable member 11 urged by the spring 14 is located at the position farthest from the seat surface 12a inside the holding member 12. At this time, the convex portion 11b of the movable member 11 abuts against the first stopper portion 12d of the holding member 12, and even if the convex portion 11b is biased by the spring 14, the movement of the movable member 11 is restricted and the position is determined.

図7(a)に示すように、ベルト9の端面が端面対向部11aに当接していない時、ベルト9の端面と可動部材11の端面対向部11aとの距離はD1である。また、保持部材12の座面12aから可動部材11の端面対向部11aまでの距離はD2となっている。   As shown in FIG. 7A, when the end surface of the belt 9 is not in contact with the end surface facing portion 11a, the distance between the end surface of the belt 9 and the end surface facing portion 11a of the movable member 11 is D1. Further, the distance from the seating surface 12a of the holding member 12 to the end surface facing portion 11a of the movable member 11 is D2.

図7(b)は、ベルト9がM1方向へ寄り移動してベルト9の端面が端面対向部11aに当接し、更に、バネ14の付勢力に抗してベルト9が可動部材11をM1方向へ押圧した状態を示す。   In FIG. 7B, the belt 9 moves toward the M1 direction, the end surface of the belt 9 contacts the end surface facing portion 11a, and the belt 9 resists the urging force of the spring 14 to move the movable member 11 in the M1 direction. The state pressed to is shown.

ベルト9が、例えばローラ3とベルト9の相対的なアライメントがずれている等の要因により可動部材11側へ寄り移動すると、ベルト9の端面が可動部材11に当接する。更に寄り移動すると、ベルト9は可動部材をバネ14の付勢力に抗してM1方向へ押し、可動部材11は移動する。可動部材11の凸部11bが保持部材12の凹部12bに沿って移動するので、可動部材11はM2方向へ移動する。そして、凸部11bが凹部12bの第2ストッパー部12gに突き当たった時点で可動部材11の移動は停止する。この時、図7(b)に示すように、保持部材12の座面12aから可動部材11の端面対向部11aまでの距離はD3(<D2)となっている。また、図7(a)の状態に比べて可動部材11は記録材搬送方向Sの上流側に距離D4移動している。   When the belt 9 moves toward the movable member 11 due to, for example, a relative misalignment between the roller 3 and the belt 9, the end surface of the belt 9 contacts the movable member 11. When moving further, the belt 9 pushes the movable member in the M1 direction against the urging force of the spring 14, and the movable member 11 moves. Since the convex portion 11b of the movable member 11 moves along the concave portion 12b of the holding member 12, the movable member 11 moves in the M2 direction. And the movement of the movable member 11 stops when the convex part 11b collides with the 2nd stopper part 12g of the recessed part 12b. At this time, as shown in FIG. 7B, the distance from the seating surface 12a of the holding member 12 to the end surface facing portion 11a of the movable member 11 is D3 (<D2). Further, the movable member 11 has moved a distance D4 upstream in the recording material conveyance direction S compared to the state of FIG.

上述したように、ベルト9が回転している時、ベルト9の内面は可動部材11の内面対向部11cと接触している。したがって、図7(b)のように可動部材11が記録材搬送方向Sの上流側へ移動すると、内面対向部11cがベルト9の内面を押し、結果的に補正機構10R側のベルト端部が記録材搬送方向Sの上流側へ移動する。一方、ヒータ長手方向に関して補正機構10Rの位置する側とは逆側に位置する補正機構10Lは、ベルト9の端面に押されていないので、補正機構10Lの可動部材は移動しない。   As described above, when the belt 9 is rotating, the inner surface of the belt 9 is in contact with the inner surface facing portion 11 c of the movable member 11. Accordingly, when the movable member 11 moves upstream in the recording material conveyance direction S as shown in FIG. 7B, the inner surface facing portion 11c pushes the inner surface of the belt 9, and as a result, the belt end on the correction mechanism 10R side is moved. It moves to the upstream side in the recording material conveyance direction S. On the other hand, since the correction mechanism 10L located on the opposite side to the side where the correction mechanism 10R is located with respect to the heater longitudinal direction is not pushed by the end face of the belt 9, the movable member of the correction mechanism 10L does not move.

ベルト9の寄り移動方向が逆の場合、即ち、補正機構10Lにベルトが突き当たった場合は、補正機構10L内の可動部材のみが記録材搬送方向Sの上流側に移動する。この移動により、補正機構10L側のベルト端部が記録材搬送方向Sの上流側へ移動する。   When the moving direction of the belt 9 is reversed, that is, when the belt hits the correction mechanism 10L, only the movable member in the correction mechanism 10L moves upstream in the recording material conveyance direction S. By this movement, the belt end on the correction mechanism 10L side moves to the upstream side in the recording material conveyance direction S.

このように、ベルト9がヒータ長手方向(ベルトの母線方向)へ寄り移動し、二つの補正機構10R、10Lのうちの一方に突き当たると、寄り方向の下流側のベルト9の端部だけが記録材搬送方向上流に向って力を受ける。この原理により、ベルト9のローラ3に対するアライメントが変わり、ベルトの姿勢が補正され、可動部材から離れる方向(図7(b)に示す方向M1とは逆方向)にベルトが移動し、ベルト9の端面に掛る力が抑制される。これにより、ベルトの破損を抑制できる。なお、上述のように可動部材11はバネ14で付勢されている。このため、図7(b)に示す状態から、ベルト9が方向M1とは逆方向へ移動すると、可動部材11は図7(a)で示す位置、または、図7(a)と図7(b)の間の位置へ押し戻される。   Thus, when the belt 9 moves in the heater longitudinal direction (belt bus direction) and hits one of the two correction mechanisms 10R, 10L, only the end of the belt 9 on the downstream side in the deviation direction is recorded. It receives force toward the upstream of the material conveyance direction. By this principle, the alignment of the belt 9 with respect to the roller 3 is changed, the posture of the belt is corrected, the belt moves in a direction away from the movable member (the direction opposite to the direction M1 shown in FIG. 7B), and the belt 9 The force applied to the end face is suppressed. Thereby, damage to the belt can be suppressed. Note that the movable member 11 is biased by the spring 14 as described above. For this reason, when the belt 9 moves in the direction opposite to the direction M1 from the state shown in FIG. 7B, the movable member 11 is moved to the position shown in FIG. 7A, or FIG. 7A and FIG. It is pushed back to the position between b).

次に、図8(a)及び図8(b)を用いて、ベルト9端面にかかる応力を下げる原理について更に説明を行う。図8(a)及び図8(b)は、加熱ユニット2とローラ3をベルト9側から見た図である。図8(a)はベルトが寄り移動している状態、図8(b)はベルトの寄り移動がなくなった状態を示している。   Next, the principle of lowering the stress applied to the end face of the belt 9 will be further described with reference to FIGS. 8 (a) and 8 (b). FIGS. 8A and 8B are views of the heating unit 2 and the roller 3 as viewed from the belt 9 side. FIG. 8A shows a state in which the belt is shifted and FIG. 8B shows a state in which the belt is not moved.

一般的にベルト9が母線方向に寄る原因は、ローラ3とベルト9のアライメントずれによるものである。図8(a)は前述したアライメントずれを起こした状態であり、補正機構10R側のベルト端部が記録材搬送方向Sの下流側へ、補正機構10L側のベルト端部が記録材搬送方向Sの上流側へ傾いた状態を表す。図8(a)で示すように、ベルト9はローラ3の回転により力Fを受ける。力Fは、ベルト9の母線方向F1と、それに直交する方向F2に分解することができ、ベルト9は力F1によって補正機構10Rに向って寄り移動する。ベルト9が補正機構10Rの可動部材11に接触して可動部材11を押すと、可動部材11は保持部材12に案内され、記録材搬送方向Sの上流側へ移動する。可動部材11の移動に伴い、前述した原理でベルト9の姿勢が図8(b)のように補正される。ローラ3とベルト9のアライメントのずれが解消されるため、力Fとベルト9母線方向の角度が変わる。その結果、力F1低減し、ベルト9端面にかかる応力も低減する。   In general, the cause of the belt 9 moving in the direction of the bus is due to misalignment between the roller 3 and the belt 9. FIG. 8A shows a state in which the above-described misalignment occurs, the belt end on the correction mechanism 10R side downstream in the recording material conveyance direction S, and the belt end on the correction mechanism 10L side in the recording material conveyance direction S. It represents the state of tilting upstream. As shown in FIG. 8A, the belt 9 receives a force F by the rotation of the roller 3. The force F can be decomposed into a generatrix direction F1 of the belt 9 and a direction F2 orthogonal thereto, and the belt 9 moves toward the correction mechanism 10R by the force F1. When the belt 9 comes into contact with the movable member 11 of the correction mechanism 10R and pushes the movable member 11, the movable member 11 is guided by the holding member 12 and moves upstream in the recording material conveyance direction S. As the movable member 11 moves, the posture of the belt 9 is corrected as shown in FIG. Since the misalignment between the roller 3 and the belt 9 is eliminated, the force F and the angle of the belt 9 in the bus line direction change. As a result, the force F1 is reduced and the stress applied to the end face of the belt 9 is also reduced.

力F1は可動部材11の移動量によって大きさが変わる。図9は、可動部材11のヒータ長手方向への移動量に応じた、ベルト9が可動部材11を押す力及びバネ14が可動部材11を押す力の関係を示した図である。図9に示すように、ベルト9が可動部材11を押圧し始めると、ベルト9の一方の端部が可動部材の内面対向部11cに押されることによりアライメントのずれが徐々に解消される。即ち、可動部材の移動量が大きくなるほど可動部材の記録材搬送方向上流への移動量は大きくなるため、ベルトの姿勢(傾き)の補正量は大きくなり、力F1は小さくなる。一方、可動部材の移動量が大きくなると、バネ14が可動部材11を押す力は徐々に大きくなる。ベルト9が可動部材11を押圧し始める際の力が小さい時、即ち力F1が小さい時、可動部材11は、最大移動量(D2−D3)に達する前に力F1とバネ14による力が釣合う位置で停止する(状態1)。ベルト9が可動部材11を押圧し始める際の力が大きい時、即ち、力F1が大きい時、可動部材11は、力F1とバネ14による力が釣合う前に最大移動量(D2−D3)に達し、この位置で停止する(状態2)。なお、可動部材11が最大移動量(D2−D3)移動した状態においても、内面対向部11cとベルト内面が接触する状態を保つように、ベルト内面と内面対向部11cとのクリアランスが設定されている。即ち、可動部材11が記録材搬送方向上流へ距離D4移動した状態においても、内面対向部11cとベルト内面が接触する状態を保つように、ベルト内面と内面対向部11cとのクリアランスが設定されている。   The magnitude of the force F1 varies depending on the amount of movement of the movable member 11. FIG. 9 is a diagram showing the relationship between the force by which the belt 9 pushes the movable member 11 and the force by which the spring 14 pushes the movable member 11 according to the amount of movement of the movable member 11 in the heater longitudinal direction. As shown in FIG. 9, when the belt 9 starts to press the movable member 11, one end of the belt 9 is pushed by the inner surface facing portion 11 c of the movable member, so that the alignment deviation is gradually eliminated. That is, as the moving amount of the movable member increases, the moving amount of the movable member upstream in the recording material conveyance direction increases. Therefore, the correction amount of the posture (tilt) of the belt increases, and the force F1 decreases. On the other hand, as the amount of movement of the movable member increases, the force with which the spring 14 pushes the movable member 11 gradually increases. When the force at which the belt 9 starts to press the movable member 11 is small, that is, when the force F1 is small, the movable member 11 receives the force F1 and the force of the spring 14 before reaching the maximum movement amount (D2-D3). Stop at the matching position (state 1). When the force at which the belt 9 starts to press the movable member 11 is large, that is, when the force F1 is large, the movable member 11 has a maximum movement amount (D2-D3) before the force F1 and the force by the spring 14 are balanced. And stop at this position (state 2). Note that the clearance between the inner surface of the belt and the inner surface facing portion 11c is set so that the inner surface facing portion 11c and the inner surface of the belt are in contact with each other even when the movable member 11 is moved by the maximum movement amount (D2-D3). Yes. That is, the clearance between the inner surface of the belt and the inner surface facing portion 11c is set so that the inner surface facing portion 11c and the inner surface of the belt are kept in contact with each other even when the movable member 11 has moved the distance D4 upstream in the recording material conveyance direction. Yes.

以上のように、ベルト9端面に掛る応力を低減できるのでベルト9端面の摩耗を抑制することが出来る。   As described above, since the stress applied to the end face of the belt 9 can be reduced, wear of the end face of the belt 9 can be suppressed.

なお、本例では、補正機構をベルトの両端に対向する位置に夫々設けているが、ベルトの寄り方向を予め一方向に定めておき、上述した補正機構をベルトの寄り方向の側にのみ設ける構成でもよい。また、本例では、ベルトの長さが二つの可動部材間のスパンより短い構成を前提として説明した。しかしながら、ベルトの長さが二つの可動部材間のスパンとほぼ同じ構成、即ち、ベルトの両端が二つの可動部材と常に接触する構成でもよい。更に、内面対向部と端面対向部が可動部材として一つの部品になっている構成を説明したが、内面対向部と端面対向部を別部品とする構成であってもよい。これらの事項は、以下に示す他の実施例でも同様である。   In this example, the correction mechanism is provided at a position facing both ends of the belt. However, the belt shift direction is set in one direction in advance, and the above-described correction mechanism is provided only on the belt shift direction side. It may be configured. In this example, the description has been made on the assumption that the length of the belt is shorter than the span between the two movable members. However, a configuration in which the length of the belt is substantially the same as the span between the two movable members, that is, a configuration in which both ends of the belt are always in contact with the two movable members may be employed. Furthermore, although the configuration in which the inner surface facing portion and the end surface facing portion are a single component as a movable member has been described, a configuration in which the inner surface facing portion and the end surface facing portion are separate components may be used. These matters are the same in other embodiments described below.

(実施例2)
次に、実施例2の像加熱装置について、実施例1との相違点に絞って説明する。図10(a)は可動部材21の斜視図、図10(b)は可動部材21を保持する保持部材22の斜視図である。更に、図11は、二つ設けられている補正機構の内の一方である補正機構20Rを図4(b)のV1方向と同じ方向から見た時の図、図12は補正機構20Rによるベルトの姿勢を補正するメカニズムを説明する図である。
(Example 2)
Next, the image heating apparatus according to the second embodiment will be described focusing on differences from the first embodiment. FIG. 10A is a perspective view of the movable member 21, and FIG. 10B is a perspective view of the holding member 22 that holds the movable member 21. Further, FIG. 11 is a view when the correction mechanism 20R, which is one of the two correction mechanisms, is viewed from the same direction as the direction V1 in FIG. 4B, and FIG. 12 is a belt by the correction mechanism 20R. It is a figure explaining the mechanism which correct | amends the attitude | position of this.

補正機構20Rは、可動部材21、可動部材21を保持する保持部材22、可動部材21を付勢する引っ張りバネ24、及びリンク部材25で構成されている。   The correction mechanism 20R includes a movable member 21, a holding member 22 that holds the movable member 21, a tension spring 24 that biases the movable member 21, and a link member 25.

可動部材21には、ベルト9が寄り移動した時にベルトの端面が突き当たる端面対向部21a、凸部21b、ベルトの母線方向端部の内面と対向する内面対向部21c、が設けられている。更に、可動部材21には、後述するリンク部材25を回動可能に保持するための突起21d、引っ張りばね24の支持部21eを有する。   The movable member 21 is provided with an end surface facing portion 21a against which the end surface of the belt abuts when the belt 9 is moved, a convex portion 21b, and an inner surface facing portion 21c facing the inner surface of the end portion in the busbar direction of the belt. Further, the movable member 21 has a protrusion 21d for rotatably holding a link member 25 described later, and a support portion 21e for the tension spring 24.

可動部材21を保持する保持部材22には、可動部材21の端面対向部21aと略平行に設けられた面22a、可動部材21の凸部21bをガイドする凹部22bが設けられている。更に保持部材22には、リンク部材25の回動中心となる突起22d、引っ張りばね24の支持部22e、保持部材22を装置フレーム13のU字形状の凹部に嵌めこむための溝部22f、を有する。リンク部材25は、突起21dと突起22dを繋ぐように取り付けられている。   The holding member 22 that holds the movable member 21 is provided with a surface 22 a provided substantially in parallel with the end surface facing portion 21 a of the movable member 21 and a concave portion 22 b that guides the convex portion 21 b of the movable member 21. Further, the holding member 22 has a protrusion 22d that becomes a rotation center of the link member 25, a support portion 22e of the tension spring 24, and a groove portion 22f for fitting the holding member 22 into a U-shaped recess of the apparatus frame 13. . The link member 25 is attached so as to connect the protrusion 21d and the protrusion 22d.

次に、補正機構20Rの動作について説明する。図12(a)に示すように、ベルト9の端面が端面対向部21aに当接していない時、ベルト9の端面と可動部材21の端面対向部21aとの距離はD1である。また、保持部材22の面22aから可動部材21の端面対向部21aまでの距離はD2となっている。   Next, the operation of the correction mechanism 20R will be described. As shown in FIG. 12A, when the end surface of the belt 9 is not in contact with the end surface facing portion 21a, the distance between the end surface of the belt 9 and the end surface facing portion 21a of the movable member 21 is D1. Further, the distance from the surface 22a of the holding member 22 to the end surface facing portion 21a of the movable member 21 is D2.

図12(b)は、ベルト9がM1方向へ寄り移動してベルト9の端面が端面対向部21aに当接し、更に、バネ24の付勢力に抗してベルト9が可動部材21をM1方向へ押圧した状態を示す。ベルト9が可動部材21を押圧すると、凸部21bが凹部22bにガイドされながらM3方向へ移動する。この移動の際、リンク部材25は突起22dを中心に回動する。このリンク部材25の作用によって、可動部材21は図12(a)の状態から姿勢を変えずにM3方向へ平行移動する。そして、凸部21bが凹部22bの端部まで移動した時点で可動部材21の移動は停止する。この時、図12(b)に示すように、保持部材22の面22aから可動部材21の端面対向部21aまでの距離はD3(<D2)となっている。また、図12(a)の状態に比べて可動部材21は記録材搬送方向Sの上流側に距離D4移動している。   12B, the belt 9 moves toward the M1 direction, the end surface of the belt 9 comes into contact with the end surface facing portion 21a, and the belt 9 resists the urging force of the spring 24, and the belt 9 moves the movable member 21 in the M1 direction. The state pressed to is shown. When the belt 9 presses the movable member 21, the convex portion 21b moves in the M3 direction while being guided by the concave portion 22b. During this movement, the link member 25 rotates about the protrusion 22d. By the action of the link member 25, the movable member 21 translates in the M3 direction without changing the posture from the state of FIG. And the movement of the movable member 21 stops when the convex part 21b moves to the edge part of the recessed part 22b. At this time, as shown in FIG. 12B, the distance from the surface 22a of the holding member 22 to the end surface facing portion 21a of the movable member 21 is D3 (<D2). Further, the movable member 21 has moved a distance D4 upstream in the recording material conveyance direction S compared to the state of FIG.

可動部材21が記録材搬送方向Sの上流側へ移動すると、内面対向部21cがベルト9の内面を押し、結果的に補正機構20R側のベルト端部が記録材搬送方向Sの上流側へ移動する。一方、ヒータ長手方向に関して補正機構20Rの位置する側とは逆側に位置する補正機構20L(不図示)は、ベルト9の端面に押されていないので、補正機構20Lの可動部材は移動しない。   When the movable member 21 moves upstream in the recording material conveyance direction S, the inner surface facing portion 21c pushes the inner surface of the belt 9, and as a result, the belt end on the correction mechanism 20R side moves upstream in the recording material conveyance direction S. To do. On the other hand, since the correction mechanism 20L (not shown) located on the opposite side to the side where the correction mechanism 20R is located with respect to the heater longitudinal direction is not pushed by the end face of the belt 9, the movable member of the correction mechanism 20L does not move.

以上のように可動部材が移動すると、実施例1と同様の原理でベルト9のローラ3に対するアライメントが変わり、ベルトの姿勢が補正される。これにより、可動部材から離れる方向(図12(b)に示す方向M1とは逆方向)にベルトが移動し、ベルト9の端面に掛る力が抑制され、ベルトの破損を抑制できる。   When the movable member moves as described above, the alignment of the belt 9 with respect to the roller 3 is changed based on the same principle as in the first embodiment, and the posture of the belt is corrected. Thereby, the belt moves in the direction away from the movable member (the direction opposite to the direction M1 shown in FIG. 12B), the force applied to the end surface of the belt 9 is suppressed, and the belt can be prevented from being damaged.

(実施例3)
次に、実施例3の像加熱装置について、実施例1及び2との相違点に絞って説明する。図13は像加熱装置の斜視図、図14(a)は可動部材31の斜視図、図14(b)は可動部材31を保持する保持部材32の斜視図である。更に、図15(a)は、後述するリンク部材36の一端部の斜視図、図15(b)は、二つ設けられている補正機構の内の一方である補正機構30Rを図4(b)のV1方向と同じ方向から見た時の図である。図16は補正機構30R及び30Lによるベルトの姿勢を補正するメカニズムを説明する図である。
(Example 3)
Next, the image heating apparatus according to the third embodiment will be described focusing on differences from the first and second embodiments. FIG. 13 is a perspective view of the image heating apparatus, FIG. 14A is a perspective view of the movable member 31, and FIG. 14B is a perspective view of the holding member 32 that holds the movable member 31. 15A is a perspective view of one end portion of a link member 36 to be described later, and FIG. 15B shows a correction mechanism 30R which is one of two correction mechanisms. ) When viewed from the same direction as the V1 direction. FIG. 16 is a diagram for explaining a mechanism for correcting the posture of the belt by the correction mechanisms 30R and 30L.

補正機構30R及び30Lは、可動部材31、可動部材31を保持する保持部材32、二つの可動部材31を繋ぐリンク部材36で構成されている。   The correction mechanisms 30 </ b> R and 30 </ b> L include a movable member 31, a holding member 32 that holds the movable member 31, and a link member 36 that connects the two movable members 31.

可動部材31には、ベルト9が寄り移動した時にベルトの端面が突き当たる端面対向部31a、凸部31b、ベルトの母線方向端部の内面と対向する内面対向部31c、が設けられている。更に、可動部材31には、後述するリンク部材36を回動可能に保持するための穴部31dが設けられている。   The movable member 31 is provided with an end surface facing portion 31a against which the end surface of the belt abuts when the belt 9 is moved, a convex portion 31b, and an inner surface facing portion 31c facing the inner surface of the end portion in the busbar direction of the belt. Further, the movable member 31 is provided with a hole 31d for rotatably holding a link member 36 described later.

可動部材31を保持する保持部材32には、可動部材31の端面対向部31aと略平行に設けられた面32a、可動部材31の凸部31bをガイドする凹部32bが設けられている。また、保持部材32を装置フレーム13のU字形状の凹部に嵌めこむための溝部32fも設けられている。   The holding member 32 that holds the movable member 31 is provided with a surface 32 a that is provided substantially parallel to the end surface facing portion 31 a of the movable member 31 and a concave portion 32 b that guides the convex portion 31 b of the movable member 31. Further, a groove portion 32 f for fitting the holding member 32 into the U-shaped concave portion of the apparatus frame 13 is also provided.

また、本例の装置は、補正機構30Rの可動部材と、補正機構30Lの可動部材と、を繋ぐリンク部材36を有する。リンク部材36は、補正機構30Rの可動部材の穴部31dに挿入される軸部36Rと、補正機構30Lの可動部材の穴部31dに挿入される軸部36Lを有する。   Further, the apparatus of this example includes a link member 36 that connects the movable member of the correction mechanism 30R and the movable member of the correction mechanism 30L. The link member 36 has a shaft portion 36R inserted into the hole portion 31d of the movable member of the correction mechanism 30R and a shaft portion 36L inserted into the hole portion 31d of the movable member of the correction mechanism 30L.

次に、補正機構30R及び補正機構30Lの動作について説明する。図16(a)に示すように、ベルト9の端面が端面対向部31aに当接していない時、ベルト9の端面と可動部材31の端面対向部31aとの距離はD1である。また、保持部材32の面32aから可動部材31の端面対向部31aまでの距離はD2となっている。   Next, operations of the correction mechanism 30R and the correction mechanism 30L will be described. As shown in FIG. 16A, when the end surface of the belt 9 is not in contact with the end surface facing portion 31a, the distance between the end surface of the belt 9 and the end surface facing portion 31a of the movable member 31 is D1. Further, the distance from the surface 32a of the holding member 32 to the end surface facing portion 31a of the movable member 31 is D2.

図16(b)は、ベルト9がM1方向へ寄り移動してベルト9の端面が補正機構30Rの可動部材の端面対向部31aに当接し、更に、ベルト9が可動部材31をM1方向へ押圧した状態を示す。ベルト9が可動部材31を押圧すると、凸部31bが凹部32bにガイドされながら補正機構30Rの可動部材がM4方向へ移動する。一方の補正機構30Lの可動部材と他方の補正機構30Rの可動部材はリンク部材36によって繋がっており、二つの可動部材は連動する。したがって、補正機構30Rの可動部材がM4方向へ移動すると、補正機構30Lの可動部材はM5方向へ移動する。即ち、補正機構30Rの可動部材が記録材反ソ方向上流側へ移動すると、補正機構30Lの可動部材は記録材搬送方向下流へ移動する。   In FIG. 16B, the belt 9 moves toward the M1 direction, the end surface of the belt 9 comes into contact with the end surface facing portion 31a of the movable member of the correction mechanism 30R, and the belt 9 presses the movable member 31 in the M1 direction. Shows the state. When the belt 9 presses the movable member 31, the movable member of the correction mechanism 30R moves in the M4 direction while the convex portion 31b is guided by the concave portion 32b. The movable member of one correction mechanism 30L and the movable member of the other correction mechanism 30R are connected by a link member 36, and the two movable members are interlocked. Therefore, when the movable member of the correction mechanism 30R moves in the M4 direction, the movable member of the correction mechanism 30L moves in the M5 direction. That is, when the movable member of the correction mechanism 30R moves to the upstream side in the direction opposite to the recording material, the movable member of the correction mechanism 30L moves downstream in the recording material conveyance direction.

なお、図16(b)において、距離D3は、凸部31bが凹部32bの端部まで移動した時点における面32aから端面対向部31aまでの距離を示している。また、この時、二つの可動部材の記録材搬送方向への移動距離は共にD4となっている。ベルト9が補正機構30L側へ寄った場合、二つの可動部材の記録材搬送方向における移動方向は、図16(b)に示す方向と逆になる。   In FIG. 16B, the distance D3 indicates the distance from the surface 32a to the end surface facing portion 31a when the convex portion 31b moves to the end of the concave portion 32b. At this time, the moving distances of the two movable members in the recording material conveyance direction are both D4. When the belt 9 approaches the correction mechanism 30L side, the movement direction of the two movable members in the recording material conveyance direction is opposite to the direction shown in FIG.

上述した構成にすることで、片側の可動部材だけが移動する構成よりも、ベルトの寄りを補正する向きへのベルト9の傾きが大きくなり、ベルトの寄りを補正する能力が高くなる。   With the above-described configuration, the inclination of the belt 9 in the direction in which the belt shift is corrected becomes larger than the configuration in which only one movable member moves, and the ability to correct the belt shift is enhanced.

(実施例4)
次に、実施例4の像加熱装置について、実施例1〜3との相違点に絞って説明する。
Example 4
Next, the image heating apparatus according to the fourth embodiment will be described focusing on differences from the first to third embodiments.

本実施例の補正機構は、ベルト9の寄り移動を検知するセンサ46を有しており、センサ46の出力に応じたモータ(駆動部)の動力で可動部材を記録材搬送方向上流へ移動させるものである。   The correction mechanism of this embodiment has a sensor 46 that detects the shift of the belt 9 and moves the movable member upstream in the recording material conveyance direction by the power of the motor (drive unit) according to the output of the sensor 46. Is.

図17(a)は補正機構40Lの斜視図、図17(b)は補正機構40Lを上から見た図である。逆側の補正機構40Rも同様の構成である。図18(a)及び(b)は補正機構の動作を説明する図である。   FIG. 17A is a perspective view of the correction mechanism 40L, and FIG. 17B is a view of the correction mechanism 40L as viewed from above. The reverse correction mechanism 40R has the same configuration. 18A and 18B are views for explaining the operation of the correction mechanism.

可動部材41の上部にはフォトセンサ46が配置されている。センサ46はベルト母線方向における可動部材41の移動を検知している。ベルト9が可動部材41に当接しておらず、可動部材が移動していない時は、可動部材41が図18(a)で示す位置にありセンサ46に設けられた光源からの反射光はセンサに反射されない。しかしながら、可動部材41がベルト9の寄り移動によりベルト母線方向へ移動すると、可動部材41が図18(b)で示す位置に移動するし、光源からの反射光をセンサ46が検出する。この出力に応じて、不図示のモータで、可動部材41のラック部41hに設けたギア41hGと係合するギア40RGを回転させ、M6方向、即ち、記録材搬送方向の上流側へ可動部材41を移動させる。   A photo sensor 46 is disposed on the movable member 41. The sensor 46 detects the movement of the movable member 41 in the belt bus direction. When the belt 9 is not in contact with the movable member 41 and the movable member is not moving, the reflected light from the light source provided in the sensor 46 is detected when the movable member 41 is at the position shown in FIG. Is not reflected. However, when the movable member 41 moves in the belt bus direction due to the movement of the belt 9, the movable member 41 moves to the position shown in FIG. 18B, and the sensor 46 detects the reflected light from the light source. In response to this output, a motor 40 (not shown) rotates a gear 40RG that engages with a gear 41hG provided in the rack portion 41h of the movable member 41, and moves the movable member 41 in the M6 direction, that is, upstream in the recording material conveyance direction. Move.

これにより、実施例1と同様の原理でベルト9のローラ3に対するアライメントが変わり、ベルトの姿勢が補正され、可動部材から離れる方向にベルトが移動し、ベルト9の端面に掛る力が抑制される。   Thereby, the alignment of the belt 9 with respect to the roller 3 is changed based on the same principle as in the first embodiment, the posture of the belt is corrected, the belt moves away from the movable member, and the force applied to the end surface of the belt 9 is suppressed. .

なお、本実施例の場合、ベルトの端面が可動部材の端面対向部に当接する前に可動部材を方向M6へ移動させてもよい。   In the case of the present embodiment, the movable member may be moved in the direction M6 before the end surface of the belt contacts the end surface facing portion of the movable member.

(実施例5)
次に、実施例5の像加熱装置について、実施例1〜4との相違点に絞って説明する。
(Example 5)
Next, the image heating apparatus according to the fifth embodiment will be described focusing on differences from the first to fourth embodiments.

本例の可動部材は、ベルトの姿勢を補正するためにベルトを記録材搬送方向の上流側へ押す部分が、ベルトの外面と対向する部分である点が上述した実施例と異なる。図19は本例の装置の補正機構部分の斜視図である。補正機構50Rは可動部材51及び保持部材52を有する。可動部材51は、ベルト端部の外面と対向する外面対向部51jを有し、ベルトが寄り移動して可動部材を押すと、その力を利用して可動部材の外面対向部51jがベルトの端部を記録材搬送方向の上流側に向って付勢する。これにより、実施例1と同様の原理でベルト9のローラ3に対するアライメントが変わり、ベルトの姿勢が補正され、可動部材から離れる方向にベルトが移動し、ベルト9の端面に掛る力が抑制される。   The movable member of this example is different from the above-described embodiment in that the portion that pushes the belt to the upstream side in the recording material conveyance direction in order to correct the posture of the belt is the portion that faces the outer surface of the belt. FIG. 19 is a perspective view of the correction mechanism portion of the apparatus of this example. The correction mechanism 50 </ b> R includes a movable member 51 and a holding member 52. The movable member 51 has an outer surface facing portion 51j that faces the outer surface of the belt end portion. When the belt moves and pushes the movable member, the outer surface facing portion 51j of the movable member uses the force to move the end of the belt. The portion is biased toward the upstream side in the recording material conveyance direction. Thereby, the alignment of the belt 9 with respect to the roller 3 is changed based on the same principle as in the first embodiment, the posture of the belt is corrected, the belt moves away from the movable member, and the force applied to the end surface of the belt 9 is suppressed. .

9 ベルト
10R、10L 補正機構
11 可動部材
12 保持部材
9 Belt 10R, 10L Correction mechanism 11 Movable member 12 Holding member

Claims (6)

画像を担持する記録材と接触しつつ回転する筒状の可撓性回転体であって、張架されていない可撓性回転体を有し、画像を担持する記録材を搬送しつつ加熱する像加熱装置において、
前記回転体の母線方向端部で前記回転体の内面に対向する内面対向部と、
前記回転体の端面に対向する端面対向部と、
を有し、
前記回転体前記母線方向へ寄り移動して前記端面対向部が前記回転体に押されると、前記端面対向部の移動に伴い前記内面対向部が記録材の搬送方向上流に向かって移動し、前記回転体の内面が前記内面対向部に押されることを特徴とする像加熱装置。
A cylindrical flexible rotating body that rotates while being in contact with a recording material that carries an image, and has a flexible rotating body that is not stretched, and heats the recording material that carries the image while transporting it. In the image heating device,
An inner surface facing portion that faces an inner surface of the rotating body at a busbar direction end of the rotating body;
An end surface facing portion facing the end surface of the rotating body;
Have
When the rotating body is the said end face facing portion moves deviation the generatrix direction is pushed to the rotary member, said inner surface facing portion along with the movement of the end surface facing portion is moved toward the conveying direction upstream of the recording material, An image heating apparatus, wherein an inner surface of the rotating body is pushed by the inner surface facing portion .
前記回転体の端面が前記端面対向部から離間すると前記内面対向部が元の位置に戻るように付勢する付勢部材を有することを特徴とする請求項1に記載の像加熱装置。The image heating apparatus according to claim 1, further comprising an urging member that urges the inner surface facing portion to return to an original position when the end surface of the rotating body is separated from the end surface facing portion. 前記内面対向部は、前記搬送方向に対して平行移動することを特徴とする請求項1又は2に記載の像加熱装置。The image heating apparatus according to claim 1, wherein the inner surface facing portion moves in parallel with respect to the transport direction. 前記装置は更に、前記回転体の外面に接触するローラを有し、前記回転体は前記ローラの回転に従動して回転することを特徴とする請求項1〜3いずれか一項に記載の像加熱装置。The image according to claim 1, wherein the apparatus further includes a roller that contacts an outer surface of the rotating body, and the rotating body rotates following the rotation of the roller. Heating device. 前記装置は更に、前記回転体を加熱するヒータを有することを特徴とする請求項1〜4いずれか一項に記載の像加熱装置。The image heating apparatus according to claim 1, wherein the apparatus further includes a heater that heats the rotating body. 前記ヒータは前記回転体の内面に接触していることを特徴とする請求項5に記載の像加熱装置。The image heating apparatus according to claim 5, wherein the heater is in contact with an inner surface of the rotating body.
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