JP2014153512A - Fixing device and image forming apparatus including the same - Google Patents

Fixing device and image forming apparatus including the same Download PDF

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JP2014153512A
JP2014153512A JP2013022416A JP2013022416A JP2014153512A JP 2014153512 A JP2014153512 A JP 2014153512A JP 2013022416 A JP2013022416 A JP 2013022416A JP 2013022416 A JP2013022416 A JP 2013022416A JP 2014153512 A JP2014153512 A JP 2014153512A
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belt
meandering
fixing device
fixing
axial direction
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JP5865853B2 (en
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Eiji Nakajima
栄次 中嶋
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Kyocera Document Solutions Inc
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Kyocera Document Solutions Inc
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Abstract

PROBLEM TO BE SOLVED: To provide a fixing device that regulates meandering of a belt stably for a long period with a simple configuration at a low cost, and an image forming apparatus including the fixing device.SOLUTION: A fixing device 5 includes a meandering regulating member 45 that is disposed on both ends in an axial direction of a fixing roller 18, and regulates meandering of a belt 26 in the axial direction of the fixing roller 18. The meandering regulating member 45 has a tapered outer peripheral part 45a arranged to face an inner peripheral surface of the belt 26. The tapered outer peripheral part 45a is formed to have an outer diameter at a central part in the axial direction smaller than that of the inner peripheral surface of the belt 26, whereas to have an outer diameter on end part sides in the axial direction larger than that of the inner peripheral surface of the belt 26.

Description

本発明は、定着ローラーに外装されるベルトのローラー軸方向への蛇行を規制する定着装置及びそれを備えた画像形成装置に関するものである。   The present invention relates to a fixing device that restricts meandering of a belt mounted on a fixing roller in the roller axial direction and an image forming apparatus including the fixing device.

画像形成装置は、感光体ドラム等の像担持体に形成されたトナー像を記録媒体に転写し、トナー像を担持する記録媒体を定着装置に向けて搬送し、定着装置において、熱及び圧力を加えることにより記録媒体上のトナー像を記録媒体に定着させている。定着装置には、定着ローラーと熱ローラーとの間で回転可能に張架された定着ベルトと、定着ベルトに圧接される加圧ローラーとを備え、記録媒体が定着ベルトと加圧ローラーとの間のニップ部を通過する間にトナー像を記録媒体に定着されるベルト定着方式がある。   The image forming apparatus transfers a toner image formed on an image carrier such as a photosensitive drum to a recording medium, conveys the recording medium carrying the toner image toward a fixing device, and heat and pressure are applied to the fixing device. In addition, the toner image on the recording medium is fixed on the recording medium. The fixing device includes a fixing belt that is rotatably stretched between a fixing roller and a heat roller, and a pressure roller that is pressed against the fixing belt, and the recording medium is disposed between the fixing belt and the pressure roller. There is a belt fixing method in which a toner image is fixed on a recording medium while passing through the nip portion of the toner.

ベルト定着方式の定着装置では、ローラー間で張架した定着ベルトを回転させているとき、定着ベルトがローラー上でローラー軸方向に移動して蛇行する場合がある。定着ベルトの蛇行が発生すると、記録媒体上のトナー像の位置がずれる等の定着不良の要因となり、また定着ベルトの蛇行が継続すると、ベルトの幅方向の端部が破損するおそれがあった。   In a belt fixing type fixing device, when a fixing belt stretched between rollers is rotated, the fixing belt may meander on the roller while moving in the roller axis direction. If the fixing belt meanders, it may cause a fixing failure such as the position of the toner image on the recording medium being shifted, and if the fixing belt meandering continues, the end in the width direction of the belt may be damaged.

そこで、ベルトの蛇行を抑制する技術が従来から知られている。例えば、特許文献1記載の定着装置は、定着ローラーと懸架ローラーとに懸架された定着ベルトと、懸架ローラーの軸端部の両側に設けられた、ローラー軸方向に移動可能な定着ベルトの蛇行を検知するためのベルト寄り検知手段と、懸架ローラーの軸端部を軸方向に対して直角方向に変位可能に支持する支持手段と、定着ベルトがベルト寄り検知手段を介して軸方向に移動したとき、懸架ローラーの軸端部の変位を軸方向と直角方向の変位に変換する変換手段とを有する。この構成において、ベルト蛇行が発生して、定着ベルトが蛇行方向に移動した時、懸架ローラーとともに回転しているベルト寄り検知手段が、定着ベルトの縁部に押されて、定着ベルトの蛇行方向に移動する。ベルト寄り検知手段の蛇行方向への移動にともなって、支持手段が変換手段によって蛇行方向(軸方向)と直角方向に変位し、懸架ローラーも支持手段とともに軸方向と直角方向に移動する。この時、定着ベルトには蛇行を軽減する方向の力が作用しベルト蛇行を防止している。   Therefore, a technique for suppressing the meandering of the belt is conventionally known. For example, in the fixing device described in Patent Document 1, a fixing belt suspended between a fixing roller and a suspension roller, and a fixing belt provided on both sides of a shaft end portion of the suspension roller and movable in the axial direction of the roller. A belt deviation detecting means for detecting, a supporting means for supporting the shaft end portion of the suspension roller so as to be displaceable in a direction perpendicular to the axial direction, and when the fixing belt moves in the axial direction via the belt deviation detecting means. And conversion means for converting the displacement of the shaft end portion of the suspension roller into a displacement perpendicular to the axial direction. In this configuration, when the belt meandering occurs and the fixing belt moves in the meandering direction, the belt deviation detecting means rotating together with the suspension roller is pushed by the edge of the fixing belt, and in the meandering direction of the fixing belt. Moving. As the belt deviation detecting means moves in the meandering direction, the supporting means is displaced in the direction perpendicular to the meandering direction (axial direction) by the converting means, and the suspension roller also moves in the direction perpendicular to the axial direction together with the supporting means. At this time, a force in the direction of reducing the meandering acts on the fixing belt to prevent the meandering of the belt.

また、特許文献2記載の定着装置は、駆動ローラー及び蛇行修正ローラーに張架されるベルトと、ベルトの端部に接触しベルトの蛇行を検知する蛇行検知センサーと、蛇行修正ローラーを揺動させるためにモーターの駆動により回転する蛇行修正カムと、蛇行検知センサーの検知結果によりモーターを回転させるクラッチと、を備える。蛇行検知センサーがベルトの蛇行を検知すると、クラッチがオンし、モーターの回転力が蛇行修正カムに伝達される。これにより蛇行修正カムが回転し始め、蛇行修正ローラーがベルトの蛇行を修正する方向に揺動する。   In addition, the fixing device described in Patent Document 2 swings a belt stretched around a driving roller and a meandering correction roller, a meandering detection sensor that detects the meandering of the belt by contacting the end of the belt, and a meandering correction roller. Therefore, a meandering correction cam that rotates by driving the motor and a clutch that rotates the motor by the detection result of the meandering detection sensor are provided. When the meander detection sensor detects the meander of the belt, the clutch is turned on, and the rotational force of the motor is transmitted to the meander correction cam. As a result, the meandering correction cam starts to rotate, and the meandering correction roller swings in a direction for correcting the meandering of the belt.

特開平11−65336号公報(段落[0038]〜[0045]、第1図、第3図)JP 11-65336 A (paragraphs [0038] to [0045], FIGS. 1 and 3) 特開平5−132180号公報(段落[0020]〜[0023]、第1図)JP-A-5-132180 (paragraphs [0020] to [0023], FIG. 1)

特許文献1記載の定着装置では、変換手段は、ベルト寄り検知手段のガイド部材に接触して蛇行方向の変位をその直角方向の変位に変換する傾斜面を有する板カム部材で構成され、また、支持手段は、ガイド部材を板カム部材に常に接触するように付勢するスプリングと、軸方向(蛇行方向)と直角方向に移動可能である懸架ローラーの軸端部を嵌入するための長孔を有する側板とで構成されている。このような構成では、定着ベルト駆動の開始時或いは終了時等には定着ベルトに掛かる負荷が変動し、定着ベルトに掛かる負荷が変動すると、懸架ローラーが側板の長孔内で位置が不安定となる。また、板カム部材とガイド部材がスプリングの付勢による片当たりであるため、懸架ローラーの軸端部の軸方向の変位を軸方向と直角方向の変位に滑らかに変換することが難しい。   In the fixing device described in Patent Document 1, the conversion unit is configured by a plate cam member having an inclined surface that contacts the guide member of the belt deviation detection unit and converts the displacement in the meandering direction into the displacement in the perpendicular direction. The support means includes a spring that urges the guide member so as to always contact the plate cam member, and a long hole for fitting the axial end portion of the suspension roller that is movable in a direction perpendicular to the axial direction (meandering direction). It is comprised with the side plate which has. In such a configuration, the load applied to the fixing belt fluctuates at the start or end of driving of the fixing belt, and if the load applied to the fixing belt fluctuates, the position of the suspension roller becomes unstable in the long hole of the side plate. Become. Further, since the plate cam member and the guide member are in a single contact due to the bias of the spring, it is difficult to smoothly convert the axial displacement of the shaft end portion of the suspension roller into a displacement perpendicular to the axial direction.

また、特許文献2記載の定着装置は、定着ベルトの蛇行修正のために検知センサー、モーター、クラッチ及び蛇行修正機構を備え、装置が複雑で高価なものとなる。   Further, the fixing device described in Patent Document 2 includes a detection sensor, a motor, a clutch, and a meandering correction mechanism for correcting the meandering of the fixing belt, and the device becomes complicated and expensive.

上記二つのローラー間でベルトを張架するベルト定着方式の定着装置に限らず、ベルトが定着ローラーに外装され、定着ローラーがベルトを介して加圧ローラーに圧接する方式の定着装置においても、ベルトの蛇行が発生し、上記のベルト定着方式と同様の問題が発生する。   The belt fixing system is not limited to the belt fixing system in which the belt is stretched between the two rollers, and the belt is also mounted on the fixing roller, and the fixing roller of the system in which the fixing roller is pressed against the pressure roller through the belt is also a belt. This causes the same problem as in the belt fixing method described above.

本発明は、上記のような課題を解決するためになされたものであり、簡単な構成で安価に長期間安定してベルトの蛇行を規制する定着装置及びそれを備えた画像形成装置を提供することを目的とする。   The present invention has been made to solve the above-described problems, and provides a fixing device that regulates meandering of a belt stably for a long period of time at a low cost with a simple configuration, and an image forming apparatus including the same. For the purpose.

上記目的を達成するために第1の発明は、加熱手段によって加熱される無端状のベルトと、該ベルトの外周面に対向配置され回転可能である加圧ローラーと、前記ベルトの内周面に対向し前記ベルトを介して前記加圧ローラーに圧接されて回転する定着ローラーと、該定着ローラーの軸方向の両端部に配設され、前記ベルトの前記定着ローラーの軸方向への蛇行を規制する蛇行規制部材と、を備え、記録媒体を前記ベルトと前記加圧ローラーとの間で挟持して、記録媒体上の未定着トナー像を溶融定着する定着装置において、前記蛇行規制部材は、前記ベルトの内周面に対向するテーパー状外周部を有し、前記テーパー状外周部は、前記軸方向の中央部側の外径が前記ベルトの内周面より小さく形成される一方、前記軸方向の端部側の外径が前記ベルトの内周面より大きく形成されることを特徴としている。   In order to achieve the above object, the first invention provides an endless belt heated by heating means, a pressure roller disposed opposite to the outer peripheral surface of the belt and rotatable, and an inner peripheral surface of the belt. A fixing roller that is opposed to and rotates against the pressure roller via the belt, and is disposed at both ends of the fixing roller in the axial direction, and regulates meandering of the belt in the axial direction of the fixing roller. A fixing device that melts and fixes an unfixed toner image on the recording medium by sandwiching the recording medium between the belt and the pressure roller, and the meandering restriction member includes the belt A tapered outer peripheral portion facing the inner peripheral surface of the belt, and the tapered outer peripheral portion is formed such that an outer diameter on the central portion side in the axial direction is smaller than an inner peripheral surface of the belt. The outer diameter on the end side is It is characterized by being larger than the inner peripheral surface of serial belt.

第1の発明によれば、ベルトがローラー軸方向へ蛇行した場合、ベルトの一方の端部は、蛇行規制部材のテーパー状外周部に当接する。更にベルトが軸方向に移動(蛇行)すると、ベルトの一方の端部とテーパー状外周部との接触圧が大きくなり、ベルトが所定の位置で停止させられることで、ベルトの蛇行が規制される。このように、定着ローラーの両端部にテーパー状の蛇行規制部材を配設するという安価で簡単な構成で、長期間安定してベルト蛇行を規制することができる。   According to the first invention, when the belt meanders in the roller axis direction, one end of the belt comes into contact with the tapered outer peripheral portion of the meandering restriction member. When the belt further moves (meanders) in the axial direction, the contact pressure between one end of the belt and the tapered outer peripheral portion increases, and the belt is stopped at a predetermined position, thereby restricting the meandering of the belt. . As described above, the belt meandering can be stably controlled for a long period of time with an inexpensive and simple configuration in which the tapered meandering restricting members are provided at both ends of the fixing roller.

本発明の実施形態に係る定着装置を備えた画像形成装置を示す断面図1 is a cross-sectional view illustrating an image forming apparatus including a fixing device according to an embodiment of the present invention. 実施形態に係る定着装置を示す側面断面図Side surface sectional drawing which shows the fixing device which concerns on embodiment 実施形態に係る定着装置の蛇行規制部材を示す平面断面図Plan sectional drawing which shows the meandering control member of the fixing device which concerns on embodiment

以下に本発明の実施形態について図面を参照して説明するが、本発明は、この実施形態に限定されない。また発明の用途やここで示す用語等はこれに限定されるものではない。   Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to these embodiments. Further, the use of the invention and the terms shown here are not limited thereto.

図1は、本発明に係る定着装置を備えた画像形成装置の一実施形態を示すタンデム型カラープリンターの断面図である。画像形成装置1は、記録媒体である用紙Pを収容する給紙部10と、給紙部10の上方に配される4つの画像形成部29a〜29dと、画像形成部29a〜29dの上方に配設される露光器33a〜33dと、画像形成部29a〜29dの左方に配設される定着装置5と、給紙部10の右方に配設される用紙搬送路20と、画像形成装置1の上部に用紙Pを排出する排出部50とを備えている。   FIG. 1 is a cross-sectional view of a tandem color printer showing an embodiment of an image forming apparatus provided with a fixing device according to the present invention. The image forming apparatus 1 includes a paper feeding unit 10 that stores paper P that is a recording medium, four image forming units 29 a to 29 d disposed above the paper feeding unit 10, and above the image forming units 29 a to 29 d. Exposure units 33a to 33d arranged, fixing device 5 arranged on the left side of image forming units 29a to 29d, paper conveyance path 20 arranged on the right side of paper feeding unit 10, and image formation A discharge unit 50 that discharges the paper P is provided at the top of the apparatus 1.

給紙部10は画像形成装置1内の下方に配設され、給紙部14には、用紙Pを収納し挿脱可能に画像形成装置1に装着された給紙カセット13が設けられる。給紙部14の右方には、用紙搬送路20が配設され、フィードローラー21によって給紙カセット13の内に載置された用紙Pを1枚ずつ用紙搬送路20に送り出される。手差しトレイ23は、給紙部10に載置されていないサイズの用紙P等を供給するもので、フィードローラー22を備え、フィードローラー22によって用紙Pが1枚ずつ用紙搬送路20に送り出され、送り出された用紙Pは、画像形成部29a〜29dに向けて搬送される。   The paper feeding unit 10 is disposed below the image forming apparatus 1, and the paper feeding unit 14 is provided with a paper feeding cassette 13 that accommodates the paper P and is detachably attached to the image forming apparatus 1. A paper transport path 20 is disposed on the right side of the paper feed unit 14, and the paper P placed in the paper feed cassette 13 is sent to the paper transport path 20 one by one by the feed roller 21. The manual feed tray 23 supplies paper P or the like of a size that is not placed on the paper supply unit 10, and includes a feed roller 22. The paper P is fed one by one to the paper transport path 20 by the feed roller 22, The fed paper P is conveyed toward the image forming units 29a to 29d.

画像形成部29a〜29dは、用紙搬送方向の上流側(図1の右側)から順にシアン、マゼンタ、イエロー、ブラックの色ごとに用紙搬送ベルト38に対向して配設される。各画像形成部29a〜29dは、感光体31a〜31dを有し、感光体31a〜31dの周囲には、帯電器32a〜32dと、現像装置34a〜34dと、転写ローラー35a〜35dと、クリーナー36a〜36dが配設されている。   The image forming units 29a to 29d are arranged so as to face the sheet conveying belt 38 for each color of cyan, magenta, yellow, and black in order from the upstream side in the sheet conveying direction (the right side in FIG. 1). Each of the image forming units 29a to 29d includes photoreceptors 31a to 31d, and around the photoreceptors 31a to 31d, chargers 32a to 32d, developing devices 34a to 34d, transfer rollers 35a to 35d, and cleaners. 36a to 36d are disposed.

感光体31a〜31dは、感光層を形成する感光材料として、アモルファスシリコン感光体が用いられ、シアン、マゼンタ、イエロー、ブラックの各色に対応して配設される。感光層は有機感光体(OPC感光体)でもよい。現像装置34a〜34dは、感光体31a〜31dの右方に配設され、現像ローラー等を有し、感光体31a〜31dにトナーを供給する。帯電器32a〜32dは、現像装置31a〜34dに対して感光体31a〜31dの回転方向の上流側に配設され、感光体31a〜31dの表面を一様に帯電させる。   The photoconductors 31a to 31d are amorphous silicon photoconductors as photosensitive materials for forming the photosensitive layer, and are arranged corresponding to each color of cyan, magenta, yellow, and black. The photosensitive layer may be an organic photoreceptor (OPC photoreceptor). The developing devices 34a to 34d are disposed on the right side of the photoconductors 31a to 31d, have a developing roller, and supply toner to the photoconductors 31a to 31d. The chargers 32a to 32d are disposed upstream of the developing devices 31a to 34d in the rotation direction of the photoconductors 31a to 31d, and uniformly charge the surfaces of the photoconductors 31a to 31d.

露光器33a〜33dは、パーソナルコンピュータ等から画像入力部(図略)に入力された画像データに基づいて、帯電器32a〜32dと現像装置31a〜34dの間から感光体31a〜31dの表面にレーザ光を照射する。照射されたレーザ光により感光体31a〜31dの表面には静電潜像が形成され、この静電潜像が現像装置34a〜34dにより現像される。   The exposure units 33a to 33d are arranged on the surfaces of the photoreceptors 31a to 31d from between the chargers 32a to 32d and the developing devices 31a to 34d based on image data input to an image input unit (not shown) from a personal computer or the like. Irradiate with laser light. Electrostatic latent images are formed on the surfaces of the photoreceptors 31a to 31d by the irradiated laser light, and the electrostatic latent images are developed by the developing devices 34a to 34d.

用紙搬送ベルト38は、駆動ローラー40及び従動ローラー41間に張架される無端状のベルトからなり、感光体31a〜31dと転写ローラー35a〜35dとの間に用紙Pを担持して搬送するベルト走行路を形成する。転写ローラー35a〜35dが用紙搬送ベルト38を挟んで感光体31a〜31dに圧接することで、転写ニップ部が形成される。用紙搬送路20から搬送される用紙Pが用紙搬送ベルト38に担持され、用紙搬送ベルト38の回転によって感光体31a〜31dのトナー像が各転写ニップ部において用紙Pに順次転写され、用紙Pにはシアン、マゼンタ、イエロー、ブラックの4色のトナー像が重ね合わされる。   The sheet transport belt 38 is an endless belt stretched between the driving roller 40 and the driven roller 41, and is a belt that carries and transports the sheet P between the photoreceptors 31a to 31d and the transfer rollers 35a to 35d. Form a travel path. The transfer rollers 35a to 35d are brought into pressure contact with the photoreceptors 31a to 31d with the paper transport belt 38 interposed therebetween, thereby forming a transfer nip portion. The paper P transported from the paper transport path 20 is carried on the paper transport belt 38, and the toner images of the photoconductors 31 a to 31 d are sequentially transferred onto the paper P in each transfer nip portion by the rotation of the paper transport belt 38, and are transferred to the paper P. Is superimposed with toner images of four colors of cyan, magenta, yellow and black.

トナータンク39a〜39dは、現像装置34a〜34dにトナーを補給するものであり、画像形成部29a〜29dの上方に配設され、シアン、マゼンタ、イエロー、ブラックの各色のトナーを収容する。   The toner tanks 39a to 39d supply toner to the developing devices 34a to 34d, and are disposed above the image forming units 29a to 29d, and store toners of cyan, magenta, yellow, and black.

定着装置5は、用紙搬送ベルト38の下流側に配設され、画像形成部29a〜29dにおいてトナー像が転写された用紙Pを加熱及び加圧して用紙Pにトナー像を溶融定着させる。定着装置5を通過した用紙Pは、用紙搬送路15から排出部50へ排出される。   The fixing device 5 is disposed on the downstream side of the paper conveyance belt 38, and heats and presses the paper P on which the toner image is transferred in the image forming units 29a to 29d to melt and fix the toner image on the paper P. The paper P that has passed through the fixing device 5 is discharged from the paper transport path 15 to the discharge unit 50.

定着装置5は図2に示すように構成される。図2は定着装置5を示す側面断面図である。   The fixing device 5 is configured as shown in FIG. FIG. 2 is a side sectional view showing the fixing device 5.

定着装置5は、電磁誘導により加熱される定着方式を採用しており、加熱部材であるベルト26と、加圧ローラー19と、ベルト26を一体的に取り付けた定着ローラー18と、定着処理された用紙Pをベルト26から分離する分離部材20と、ベルト26に磁束を供給する加熱手段である誘導加熱部30と、温度検知部25と、温度検知部25及び誘導加熱部30に接続される制御部62と、誘導加熱部30のコイルに高周波電流を供給する電源61と、を備える。定着ローラー18及び加圧ローラー19は定着装置5のハウジング(図略)の長手方向に回転可能に支持され、分離部材20と誘導加熱部30及び温度検知部25はハウジングに固定支持される。   The fixing device 5 employs a fixing method in which heating is performed by electromagnetic induction, and a fixing process is performed on a belt 26 that is a heating member, a pressure roller 19, a fixing roller 18 to which the belt 26 is integrally attached. A separation member 20 that separates the paper P from the belt 26, an induction heating unit 30 that is a heating means for supplying magnetic flux to the belt 26, a temperature detection unit 25, and a control connected to the temperature detection unit 25 and the induction heating unit 30. And a power source 61 that supplies a high-frequency current to the coil of the induction heating unit 30. The fixing roller 18 and the pressure roller 19 are rotatably supported in the longitudinal direction of the housing (not shown) of the fixing device 5, and the separation member 20, the induction heating unit 30, and the temperature detection unit 25 are fixedly supported on the housing.

ベルト26は、無端状の耐熱ベルトであり、内周側から順に、例えば厚み35μmの電鋳ニッケルからなる誘導発熱層26aと、例えば厚み300μmのシリコーンゴム等からなる弾性層26bと、例えば厚み30μmのフッ素樹脂等からなりニップ部Nで未定着トナー像を溶融定着する際の離型性を向上させる離型層26cと、が積層されて構成される。   The belt 26 is an endless heat-resistant belt, in order from the inner peripheral side, for example, an induction heating layer 26a made of electroformed nickel having a thickness of 35 μm, an elastic layer 26b made of silicone rubber or the like having a thickness of 300 μm, and a thickness of 30 μm, for example. And a release layer 26c that is made of a fluororesin or the like and improves release properties when an unfixed toner image is melted and fixed at the nip portion N.

定着ローラー18は、ベルト26を一体回転可能とするために、定着ローラー18の外周部においてベルト26を外装している。例えば、定着ローラー18は、外径39mmに設定され、ステンレス鋼の芯金18a上に厚み5〜10mmのシリコーンゴム製の弾性層18bを有し、弾性層18bはベルト26の内周面に対向している。   The fixing roller 18 externally covers the belt 26 at the outer peripheral portion of the fixing roller 18 so that the belt 26 can rotate integrally. For example, the fixing roller 18 has an outer diameter of 39 mm, and has an elastic layer 18 b made of silicone rubber having a thickness of 5 to 10 mm on a stainless steel core 18 a, and the elastic layer 18 b faces the inner peripheral surface of the belt 26. doing.

加圧ローラー19は、円筒型の芯金19aと、芯金19a上に形成される弾性層19bと、弾性層19bの表面を覆う離型層19cと、を備える。例えば、加圧ローラー19は、外径36mmに設定され、アルミニウムの芯金19a上に厚み3mmのシリコーンゴム製の弾性層19bを有し、弾性層19b上に50μm厚のフッ素樹脂等からなる離型層19cを有する。また、加圧ローラー19は図示しないモーター等の駆動源によって回転駆動させられ、加圧ローラー19の回転によってベルト26及び定着ローラー18は従動回転する。加圧ローラー19とベルト26との圧接する部分にニップ部Nが形成され、ニップ部Nでは、用紙搬送ベルト38から送られた用紙P上の未定着トナー像が加熱及び加圧され用紙P上にトナー像が定着される。   The pressure roller 19 includes a cylindrical cored bar 19a, an elastic layer 19b formed on the cored bar 19a, and a release layer 19c that covers the surface of the elastic layer 19b. For example, the pressure roller 19 has an outer diameter of 36 mm, has an elastic layer 19 b made of silicone rubber having a thickness of 3 mm on an aluminum core 19 a, and a separation made of fluororesin having a thickness of 50 μm on the elastic layer 19 b. It has a mold layer 19c. The pressure roller 19 is rotated by a driving source such as a motor (not shown), and the belt 26 and the fixing roller 18 are driven to rotate by the rotation of the pressure roller 19. A nip portion N is formed at a portion where the pressure roller 19 and the belt 26 are in pressure contact with each other. In the nip portion N, an unfixed toner image on the paper P sent from the paper transport belt 38 is heated and pressurized to be on the paper P. The toner image is fixed to the toner image.

分離部材20は、定着処理後の用紙9をベルト26の外周面から分離するものであり、ベルト26の幅方向に延びる横長の板材からなる。分離部材20の先端部は、ニップ部Nの用紙搬送方向の下流側の近傍に配置され、またベルト26の外周面に対して所定の間隔を隔てて配置される。尚、分離部材20は、ベルト26の幅方向に複数個並べて設けられる分離爪で構成してもよい。   The separating member 20 separates the sheet 9 after the fixing process from the outer peripheral surface of the belt 26, and is made of a horizontally long plate material extending in the width direction of the belt 26. The leading end portion of the separating member 20 is disposed in the vicinity of the nip portion N on the downstream side in the sheet conveyance direction, and is disposed at a predetermined interval with respect to the outer peripheral surface of the belt 26. Note that the separation member 20 may be constituted by a separation claw provided in a plurality in the width direction of the belt 26.

誘導加熱部30は、コイル37と、ボビン38と、磁性体コア39とを備え、電磁誘導によりベルト26を発熱させるものである。誘導加熱部30は、長手方向(図2の紙面の表裏方向)に延びて、ベルト26の外周の略半分を囲うようにベルト26に対向して配設される。   The induction heating unit 30 includes a coil 37, a bobbin 38, and a magnetic core 39, and heats the belt 26 by electromagnetic induction. The induction heating unit 30 extends in the longitudinal direction (the front and back direction of the paper surface in FIG. 2) and is disposed so as to face the belt 26 so as to surround substantially half of the outer periphery of the belt 26.

コイル37は、ベルト26の幅方向(図2の紙面の表裏方向)に沿ってループ状に複数回(例えば8ターン)巻回してボビン38に取り付けられる。またコイル37は、電源61に接続され、電源61から供給される高周波電流により交流磁束を発生させる。コイル37からの磁束は磁性体コア39を通過し、図2の紙面に平行な方向に導かれ、ベルト26の誘導発熱層26aに沿って通過する。誘導発熱層26aを通過する磁束の交流的な強さの変化によって誘導発熱層26aには渦電流が生じる。誘導発熱層26aに渦電流が流れると、誘導発熱層26aの電気抵抗によってジュール熱が発生して、ベルト26が発熱(自己発熱)することになる。   The coil 37 is attached to the bobbin 38 by winding a plurality of times (for example, 8 turns) in a loop shape along the width direction of the belt 26 (the front and back direction of the paper surface of FIG. 2). The coil 37 is connected to a power source 61 and generates an alternating magnetic flux by a high frequency current supplied from the power source 61. The magnetic flux from the coil 37 passes through the magnetic core 39, is guided in a direction parallel to the paper surface of FIG. 2, and passes along the induction heating layer 26 a of the belt 26. An eddy current is generated in the induction heat generation layer 26a due to a change in the alternating strength of the magnetic flux passing through the induction heat generation layer 26a. When an eddy current flows through the induction heating layer 26a, Joule heat is generated by the electrical resistance of the induction heating layer 26a, and the belt 26 generates heat (self-heating).

温度検知部25は、非接触温度検知素子25aとサーミスター25bを備え、ベルト26の表面の温度を検知するために配設される。非接触温度検知素子25aは、ベルト26の幅方向の略中央部に配置され、ベルト26の略中央部の表面温度を検知している。一方、サーミスター25bは、ベルト26の軸方向の一方の端部側に配置され、ベルト26の端部側の表面温度を検知している。   The temperature detection unit 25 includes a non-contact temperature detection element 25a and a thermistor 25b, and is arranged to detect the temperature of the surface of the belt 26. The non-contact temperature detecting element 25 a is disposed at a substantially central portion in the width direction of the belt 26 and detects the surface temperature of the substantially central portion of the belt 26. On the other hand, the thermistor 25 b is disposed on one end side in the axial direction of the belt 26 and detects the surface temperature on the end side of the belt 26.

制御部62は、マイクロコンピューターとRAM及びROM等の記憶素子等で構成され、非接触温度検知素子25a及びサーミスター25bによって検知されたベルト26の表面温度に基づいて、電源61からコイル37に供給される高周波電流を制御することで、ニップ部Nに送られた用紙Pを適切に定着処理する。   The control unit 62 includes a microcomputer and a storage element such as a RAM and a ROM, and supplies the coil 37 from the power supply 61 based on the surface temperature of the belt 26 detected by the non-contact temperature detecting element 25a and the thermistor 25b. By controlling the high-frequency current that is applied, the paper P sent to the nip portion N is appropriately fixed.

ベルト26が加熱され定着可能温度に昇温すると、ニップ部Nで挟持された用紙Pが加熱されるとともに、加圧ローラー19によって加圧されることにより、用紙P上の粉体状態のトナーが用紙Pに溶融定着される。定着処理された用紙Pは分離板20によってベルト26の外周面から分離される。このように、ベルト26は薄肉の熱伝導性の良好な材質からなり熱容量が小さいため、短時間で定着装置5のウォーミングアップを行なうことができ、画像形成が迅速に開始される。   When the belt 26 is heated and heated to a fixable temperature, the paper P sandwiched by the nip portion N is heated and pressed by the pressure roller 19 so that the powdery toner on the paper P is transferred. It is melt-fixed on the paper P. The fixed sheet P is separated from the outer peripheral surface of the belt 26 by the separation plate 20. As described above, the belt 26 is made of a thin material having good thermal conductivity and has a small heat capacity. Therefore, the fixing device 5 can be warmed up in a short time, and image formation is started quickly.

図3は蛇行規制部材を備える定着装置5の一端部を示す平面断面図である。尚、定着装置5の他端部も図3と同様の構成を備える。   FIG. 3 is a plan sectional view showing one end portion of the fixing device 5 having a meandering restricting member. The other end portion of the fixing device 5 has the same configuration as that shown in FIG.

ベルト26を介して定着ローラー18と加圧ローラー19が圧接し、互いに回転するとき、定着ローラー18及び加圧ローラー19の互いの軸芯の傾き等によって、ベルト26は定着ローラー18の軸方向に移動(蛇行)することがあるが、本実施形態には、ベルト26の軸方向への蛇行を規制する蛇行規制部材45が設けられる。   When the fixing roller 18 and the pressure roller 19 are in pressure contact with each other via the belt 26 and rotate with each other, the belt 26 moves in the axial direction of the fixing roller 18 due to the inclination of the axial centers of the fixing roller 18 and the pressure roller 19. In this embodiment, a meandering regulating member 45 that regulates meandering in the axial direction of the belt 26 is provided.

蛇行規制部材45は、取り付けフランジ部材46を介して定着ローラー18の軸方向の両端部に取り付けられる。   The meandering restriction member 45 is attached to both ends of the fixing roller 18 in the axial direction via the attachment flange member 46.

蛇行規制部材45は、シリコーンゴムやシリコーン発泡体等の耐熱性を備える弾性材により略円筒状に形成され、テーパー状外周部45aと円筒状外周部45b及び嵌装部45cを有する。   The meandering restricting member 45 is formed in a substantially cylindrical shape by an elastic material having heat resistance such as silicone rubber or silicone foam, and has a tapered outer peripheral portion 45a, a cylindrical outer peripheral portion 45b, and a fitting portion 45c.

取り付けフランジ部材46は、軸方向の端部側に長く延びる定着ローラー18の芯金18aに、ネジ47によって取り付けられる。取り付けフランジ部材46は、蛇行規制部材45を嵌着するための装着外周面46aと、装着外周面46aから環状に突出するフランジ部46bを有する。取り付けフランジ部材46の装着外周面46aには、蛇行規制部材45の嵌装部45cが接着剤によって取り付けられる。   The attachment flange member 46 is attached by screws 47 to the cored bar 18a of the fixing roller 18 that extends long on the end side in the axial direction. The mounting flange member 46 includes a mounting outer peripheral surface 46a for fitting the meandering restriction member 45, and a flange portion 46b projecting annularly from the mounting outer peripheral surface 46a. The fitting portion 45c of the meandering restriction member 45 is attached to the mounting outer peripheral surface 46a of the mounting flange member 46 by an adhesive.

蛇行規制部材45が取り付けフランジ部材46に取り付けられると、蛇行規制部材45の軸方向一端部が取り付けフランジ部材46のフランジ部46bに当接する。一方、蛇行規制部材45が取り付けられた取り付けフランジ部材46が定着ローラー18の芯金18aに取り付けられると、蛇行規制部材45の軸方向他端部が定着ローラー18の弾性層18bに当接する。   When the meandering restriction member 45 is attached to the attachment flange member 46, one axial end portion of the meandering restriction member 45 abuts on the flange portion 46 b of the attachment flange member 46. On the other hand, when the mounting flange member 46 to which the meandering restricting member 45 is attached is attached to the cored bar 18 a of the fixing roller 18, the other axial end of the meandering restricting member 45 contacts the elastic layer 18 b of the fixing roller 18.

蛇行規制部材45及び取り付けフランジ部材46が定着ローラー18の芯金18aに取り付けられた状態では、ベルト26の外周面は、その一部が加圧ローラー19に当接する一方、ベルト26の内周面は、ベルト幅方向の端部が蛇行規制部材45のテーパー状外周部45aに対向している。テーパー状外周部45aは、軸方向の中央部側(内側)の外径がベルト26の内径(ベルト26の内周面)より小さく形成される一方、軸方向の端部側(外側)の外径がベルト26の内径(ベルト26の内周面)より大きく形成される。具体的には、ベルト26の内径40mmに対して、テーパー状外周部45aは、軸方向の中央部側の外径が39mmに設定される一方、軸方向の端部側の外径が40.5mmに設定される。尚、上記構成では、加圧ローラー19がベルト26の外周面の一部及びテーパー状外周部45aに当接しているが、この構成に限らず、加圧ローラー19の軸方向の長さを定着ローラー18の軸方向の長さと略同じとして、加圧ローラー19がベルト26の外周面の一部及びテーパー状外周部45aに当接しないように構成してもよい。   In a state where the meandering restricting member 45 and the mounting flange member 46 are attached to the cored bar 18 a of the fixing roller 18, the outer peripheral surface of the belt 26 is in contact with the pressure roller 19 while the inner peripheral surface of the belt 26. The end in the belt width direction faces the tapered outer peripheral portion 45a of the meandering restricting member 45. The tapered outer peripheral portion 45a is formed such that the outer diameter on the central side (inner side) in the axial direction is smaller than the inner diameter of the belt 26 (inner peripheral surface of the belt 26), while the outer side on the end side (outer side) in the axial direction. The diameter is larger than the inner diameter of the belt 26 (the inner peripheral surface of the belt 26). Specifically, with respect to the inner diameter 40 mm of the belt 26, the tapered outer peripheral portion 45 a is set to have an outer diameter on the central side in the axial direction of 39 mm, while an outer diameter on the end side in the axial direction is 40. Set to 5 mm. In the above configuration, the pressure roller 19 is in contact with part of the outer peripheral surface of the belt 26 and the tapered outer peripheral portion 45a. However, the configuration is not limited to this configuration, and the axial length of the pressure roller 19 is fixed. The pressure roller 19 may be configured to be substantially the same as the length of the roller 18 in the axial direction so that the pressure roller 19 does not contact a part of the outer peripheral surface of the belt 26 and the tapered outer peripheral portion 45a.

上記構成により、ベルト26が軸方向(図3の右方向)へ蛇行した場合、ベルト26の端部は、テーパー状外周部45aに当接する。更にベルト26が軸方向の端部側に移動(蛇行)すると、ベルト26の端部とテーパー状外周部45aとの接触圧が大きくなり、ベルト26が所定の位置で停止させられるので、ベルト26の蛇行が規制される。このように、定着ローラー18の両端部にテーパー状外周部45aを有する蛇行規制部材45を配設するという安価で簡単な構成で、長期間安定してベルト蛇行を規制することができる。   With the above configuration, when the belt 26 meanders in the axial direction (right direction in FIG. 3), the end portion of the belt 26 abuts on the tapered outer peripheral portion 45a. Further, when the belt 26 moves (meanders) toward the end in the axial direction, the contact pressure between the end of the belt 26 and the tapered outer peripheral portion 45a increases, and the belt 26 is stopped at a predetermined position. Is meandering. As described above, the belt meandering can be stably controlled for a long period of time with an inexpensive and simple configuration in which the meandering restricting member 45 having the tapered outer peripheral portion 45a is disposed at both ends of the fixing roller 18.

円筒状外周部45bは、テーパー状外周部45aに対して軸方向の端部側に配置される。具体的には、円筒状外周部45bは、テーパー状外周部45aの端部側の外径と同様に40.5mmの外径で円筒状に形成される。この構成により、ベルト26が蛇行規制のために軸方向に所定量移動するとベルト26の端部がテーパー状外周部45aを越えて円筒状外周部45bに乗り上げることになり、ベルト26が電鋳ニッケル等の金属を含んで構成される場合、電鋳ニッケル等の金属が露出するベルト26の端部がテーパー状外周部45aを損傷することがない。   The cylindrical outer peripheral portion 45b is disposed on the end side in the axial direction with respect to the tapered outer peripheral portion 45a. Specifically, the cylindrical outer peripheral portion 45b is formed in a cylindrical shape with an outer diameter of 40.5 mm, similar to the outer diameter on the end portion side of the tapered outer peripheral portion 45a. With this configuration, when the belt 26 moves by a predetermined amount in the axial direction to prevent meandering, the end of the belt 26 passes over the tapered outer peripheral portion 45a and rides on the cylindrical outer peripheral portion 45b, and the belt 26 is electroformed nickel. In the case where it is configured to include such a metal, the end portion of the belt 26 where the metal such as electroformed nickel is exposed does not damage the tapered outer peripheral portion 45a.

取り付けフランジ部材46のフランジ部46bは、蛇行規制部材45の最大径(テーパー状外周部45a軸方向の端部の外径、或いは円筒状外周部45bの外径)より大きい外径に形成される。この構成により、テーパー状外周部45a或いは円筒状外周部45bの寸法や形状のばらつきが発生し、ベルト26が蛇行規制のために軸方向に円筒状外周部45bをさらに端部側に移動しても、フランジ部46bに当接し、ベルト26の蛇行が規制される。   The flange portion 46b of the attachment flange member 46 is formed to have an outer diameter larger than the maximum diameter of the meandering restricting member 45 (the outer diameter of the tapered outer peripheral portion 45a in the axial direction or the outer diameter of the cylindrical outer peripheral portion 45b). . This configuration causes variations in the size and shape of the tapered outer peripheral portion 45a or the cylindrical outer peripheral portion 45b, and the belt 26 moves the cylindrical outer peripheral portion 45b further to the end side in the axial direction to control meandering. Also, it abuts on the flange portion 46b and the meandering of the belt 26 is restricted.

また、蛇行規制部材45及び取り付けフランジ部材46が芯金18aに取り付けられた状態では、弾性層18bを含む定着ローラー18の外径は、定着処理時、ベルト26の内径(ベルト26の内周面)より小さく構成される。具体的には、ベルト26の内径40mmに対して、弾性層18bの外径が39mmに設定される。   When the meandering restricting member 45 and the mounting flange member 46 are attached to the core metal 18a, the outer diameter of the fixing roller 18 including the elastic layer 18b is the inner diameter of the belt 26 (the inner peripheral surface of the belt 26) during the fixing process. ) Configured smaller. Specifically, the outer diameter of the elastic layer 18b is set to 39 mm with respect to the inner diameter of the belt 26 of 40 mm.

上記構成により、定着ローラー18が定着処理時に加熱されることで、芯金18a及び弾性層18bが熱膨張しても、弾性層18bの外周部がベルト26の内周面に接触しない。従って、芯金18a及び弾性層18bの熱膨張により、弾性層18bの外周部及びベルト26の内周面が接触し、さらにベルト26が押し広げられて、ベルト26と加圧ローラー19とが圧接するニップ部Nが用紙搬送方向の所定の幅より狭くなることがない。ニップ部Nが狭くなることがないので、画像の定着性能が劣化しない、また、ニップ部Nを通過した用紙Pの先端部はベルト26側に搬送され、用紙Pは分離部材20(図2参照)によってベルト26の外周面から確実に分離する。   With the above configuration, the fixing roller 18 is heated during the fixing process, so that the outer peripheral portion of the elastic layer 18 b does not contact the inner peripheral surface of the belt 26 even if the cored bar 18 a and the elastic layer 18 b are thermally expanded. Therefore, due to the thermal expansion of the cored bar 18a and the elastic layer 18b, the outer peripheral portion of the elastic layer 18b and the inner peripheral surface of the belt 26 come into contact with each other, and the belt 26 is further spread, so The nip portion N is not narrower than a predetermined width in the paper transport direction. Since the nip portion N is not narrowed, the image fixing performance is not deteriorated, and the leading end portion of the paper P that has passed through the nip portion N is conveyed to the belt 26 side, and the paper P is separated by the separating member 20 (see FIG. 2). ) To reliably separate from the outer peripheral surface of the belt 26.

尚、上記実施形態では、蛇行規制部材45が耐熱性を備える弾性材で構成される例を示したが、本発明はこれに限らず、蛇行規制部材45を剛体で構成してもよい。この場合も上記実施形態と同様の効果を奏する。   In the above-described embodiment, an example in which the meandering restricting member 45 is made of an elastic material having heat resistance is shown. However, the present invention is not limited to this, and the meandering restricting member 45 may be made of a rigid body. In this case as well, the same effects as in the above embodiment can be obtained.

また、上記実施形態では、蛇行規制部材45がテーパー状外周部45aと円筒状外周部45bを有する構成を示したが、本発明はこれに限らず、蛇行規制部材45はテーパー状外周部45aのみを有する構成であってもよい。この場合も上記実施形態と同様の効果を奏する。   In the above embodiment, the meandering restricting member 45 has a configuration including the tapered outer peripheral portion 45a and the cylindrical outer peripheral portion 45b. However, the present invention is not limited to this, and the meandering restricting member 45 includes only the tapered outer peripheral portion 45a. The structure which has this may be sufficient. In this case as well, the same effects as in the above embodiment can be obtained.

本発明は、定着ローラーに外装されるベルトのローラー軸方向への蛇行を規制する定着装置及びそれを備えた画像形成装置に利用することができる。   INDUSTRIAL APPLICABILITY The present invention can be used for a fixing device that restricts meandering of a belt that is externally mounted on a fixing roller in the axial direction of the roller, and an image forming apparatus including the fixing device.

1 画像形成装置
5 定着装置
18 定着ローラー
18a 芯金
18b 弾性層
19 加圧ローラー
20 分離部材
26 ベルト
30 誘導加熱部(加熱手段)
45 蛇行規制部材
45a テーパー状外周部
45b 円筒状外周部
45c 嵌装部
46 取り付けフランジ部材
46a 装着外周面
46b フランジ部
DESCRIPTION OF SYMBOLS 1 Image forming apparatus 5 Fixing apparatus 18 Fixing roller 18a Core metal 18b Elastic layer 19 Pressure roller 20 Separating member 26 Belt 30 Induction heating part (heating means)
45 Meandering restriction member 45a Tapered outer peripheral portion 45b Cylindrical outer peripheral portion 45c Fitting portion 46 Mounting flange member 46a Mounting outer peripheral surface 46b Flange portion

Claims (6)

加熱手段によって加熱される無端状のベルトと、
該ベルトの外周面に対向配置され回転可能である加圧ローラーと、
前記ベルトの内周面に対向し前記ベルトを介して前記加圧ローラーに圧接されて回転する定着ローラーと、
該定着ローラーの軸方向の両端部に配設され、前記ベルトの前記定着ローラーの軸方向への蛇行を規制する蛇行規制部材と、を備え、
記録媒体を前記ベルトと前記加圧ローラーとの間で挟持して、記録媒体上の未定着トナー像を溶融定着する定着装置において、
前記蛇行規制部材は、前記ベルトの内周面に対向するテーパー状外周部を有し、
前記テーパー状外周部は、前記軸方向の中央部側の外径が前記ベルトの内周面より小さく形成される一方、前記軸方向の端部側の外径が前記ベルトの内周面より大きく形成されることを特徴とする定着装置。
An endless belt heated by heating means;
A pressure roller disposed opposite to the outer peripheral surface of the belt and rotatable,
A fixing roller that is opposed to the inner peripheral surface of the belt and rotates while being pressed against the pressure roller via the belt;
A meandering regulating member disposed at both ends in the axial direction of the fixing roller and regulating meandering of the belt in the axial direction of the fixing roller,
In a fixing device that sandwiches a recording medium between the belt and the pressure roller and melts and fixes an unfixed toner image on the recording medium.
The meandering restricting member has a tapered outer peripheral portion facing the inner peripheral surface of the belt,
The tapered outer peripheral portion is formed such that the outer diameter on the central portion side in the axial direction is smaller than the inner peripheral surface of the belt, while the outer diameter on the end portion side in the axial direction is larger than the inner peripheral surface of the belt. A fixing device formed.
前記蛇行規制部材は、耐熱性を備える弾性材からなることを特徴とする請求項1に記載の定着装置。   The fixing device according to claim 1, wherein the meandering restriction member is made of an elastic material having heat resistance. 前記蛇行規制部材は、前記テーパー状外周部に連続して前記軸方向の端部側に配置される前記テーパー状外周部の最大径と同一径の円筒状外周部を有す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。   The meandering restricting member has a cylindrical outer peripheral portion having the same diameter as the maximum diameter of the tapered outer peripheral portion disposed on the end side in the axial direction continuously to the tapered outer peripheral portion. The fixing device according to claim 1 or 2. 前記蛇行規制部材の前記軸方向の端部側には、前記蛇行規制部材の最大径より大きいフランジ部が設けられることを特徴とする請求項1〜請求項3のいずれかに記載の定着装置。   The fixing device according to claim 1, wherein a flange portion larger than a maximum diameter of the meandering restriction member is provided on an end portion side of the meandering restriction member in the axial direction. 前記定着ローラーは前記ベルトの内周面に対向する弾性層を有し、前記弾性層を含む前記定着ローラーの外径は、定着処理時、前記ベルトの内径より小さくなるように構成されることを特徴とする請求項1〜請求項4のいずれかに記載の定着装置。   The fixing roller has an elastic layer facing the inner peripheral surface of the belt, and an outer diameter of the fixing roller including the elastic layer is configured to be smaller than an inner diameter of the belt during the fixing process. The fixing device according to any one of claims 1 to 4, wherein the fixing device is characterized in that: 請求項1〜請求項5のいずれかに記載の定着装置を備えた画像形成装置。   An image forming apparatus comprising the fixing device according to claim 1.
JP2013022416A 2013-02-07 2013-02-07 Fixing apparatus and image forming apparatus having the same Expired - Fee Related JP5865853B2 (en)

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JP2017044927A (en) * 2015-08-27 2017-03-02 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
US10031462B2 (en) 2014-10-31 2018-07-24 Brother Kogyo Kabushiki Kaisha Image forming apparatus
JP2018180395A (en) * 2017-04-18 2018-11-15 シャープ株式会社 Fixing device and image forming apparatus
JP2019008136A (en) * 2017-06-23 2019-01-17 コニカミノルタ株式会社 Fixing device and image forming apparatus

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JP2004045951A (en) * 2002-07-15 2004-02-12 Konica Minolta Holdings Inc Image forming device
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US10031462B2 (en) 2014-10-31 2018-07-24 Brother Kogyo Kabushiki Kaisha Image forming apparatus
JP2017044927A (en) * 2015-08-27 2017-03-02 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
JP2018180395A (en) * 2017-04-18 2018-11-15 シャープ株式会社 Fixing device and image forming apparatus
JP2019008136A (en) * 2017-06-23 2019-01-17 コニカミノルタ株式会社 Fixing device and image forming apparatus
JP6996124B2 (en) 2017-06-23 2022-01-17 コニカミノルタ株式会社 Fixing device and image forming device

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