JP4634838B2 - Fixing device - Google Patents

Fixing device Download PDF

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JP4634838B2
JP4634838B2 JP2005093394A JP2005093394A JP4634838B2 JP 4634838 B2 JP4634838 B2 JP 4634838B2 JP 2005093394 A JP2005093394 A JP 2005093394A JP 2005093394 A JP2005093394 A JP 2005093394A JP 4634838 B2 JP4634838 B2 JP 4634838B2
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heat transfer
pressure roller
transfer member
heat
fixing device
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JP2006276318A (en
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貴之 関
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Ricoh Co Ltd
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Ricoh Co Ltd
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Description

この発明は、複写機、プリンタ及びファクシミリ等の電子写真方式を使用した画像形成装置に用いられる定着装置に関するものである。   The present invention relates to a fixing device used in an image forming apparatus using an electrophotographic system such as a copying machine, a printer, and a facsimile machine.

電子写真方式を使用した画像形成装置で記録紙に転写したトナー画像を定着する定着装置には熱ローラ方式の定着装置が多く用いられている。この定着装置は、図７，８に示すように内部に熱源としてのヒータ３を有し、表面をトナーに対し離型性を有する材料、例えばシリコーンゴムやフッ素樹脂で形成した定着ローラ１と、表面が弾性の材質で覆われ、該ローラに圧接して配置された加圧ローラ２とを有し、両ローラを回転させて、その圧接部をなすニップを通過する記録紙（転写紙）５上の未定着トナー像６を加熱加圧して定着する。この熱ローラ方式の定着装置は、定着ローラ表面と転写紙上のトナー像とが加圧下で接触するため、トナー像を転写紙上に融着する際の熱効率が極めて良好であり、迅速に定着を行なうことができ、高速度電子写真複写機等において、非常に有効である。   A heat roller type fixing device is often used as a fixing device for fixing a toner image transferred onto a recording sheet by an image forming apparatus using an electrophotographic method. As shown in FIGS. 7 and 8, this fixing device has a heater 3 as a heat source inside, and a fixing roller 1 whose surface is made of a material having releasability from toner, for example, silicone rubber or fluorine resin, A recording paper (transfer paper) 5 that has a pressure roller 2 whose surface is covered with an elastic material and is placed in pressure contact with the roller, and rotates both rollers to pass through the nip forming the pressure contact portion. The upper unfixed toner image 6 is fixed by heating and pressing. In this heat roller type fixing device, since the surface of the fixing roller and the toner image on the transfer paper come into contact with each other under pressure, the heat efficiency when fusing the toner image onto the transfer paper is extremely good, and the fixing is performed quickly. This is very effective in a high-speed electrophotographic copying machine.

ところで、定着ローラ１の幅に対して、小さなサイズの転写紙５が、画像が形成されて連続して定着装置を通過した場合、定着ローラの長手方向端部の温度が定着ローラの長手方向中央部に対して高くなり、その部分に直接接触している加圧ローラ端部の温度も加圧ローラ中央部より高くなる。   By the way, when the transfer paper 5 having a size smaller than the width of the fixing roller 1 is formed with an image and continuously passes through the fixing device, the temperature at the longitudinal end of the fixing roller is the center in the longitudinal direction of the fixing roller. The temperature of the end portion of the pressure roller that is in direct contact with the portion becomes higher than that of the central portion of the pressure roller.

温度検知部材４が定着ローラ１の中央部に配置された場合、定着ローラ端部の温度が過昇することにより、定着ローラ１及び加圧ローラ２の表層の早期劣化が発生する。また、ヒータ３から発せられる熱エネルギーは転写紙５が通過しない部分の温度上昇に使われるため、エネルギー効率が非常に悪くなる。   When the temperature detection member 4 is disposed at the center of the fixing roller 1, the temperature at the end of the fixing roller is excessively increased, so that the surface layers of the fixing roller 1 and the pressure roller 2 are prematurely deteriorated. In addition, since the heat energy generated from the heater 3 is used to increase the temperature of the portion where the transfer paper 5 does not pass, the energy efficiency becomes very poor.

一方、温度検知部材４が定着ローラ１の端部に配置された場合、定着ローラ中央部（転写紙通過部）の温度が低下することにより、定着性が悪化する。   On the other hand, when the temperature detection member 4 is disposed at the end of the fixing roller 1, the fixing property deteriorates due to a decrease in the temperature of the fixing roller central portion (transfer paper passage portion).

この対応として、図面に示すように加圧ローラ２の表面に熱伝達部材７を回転可能に接触させて配置し、小さなサイズの転写紙５の通紙時、加圧ローラ２の温度分布を均一にすることが考えられた。この場合、熱伝達部材７を加圧ローラ２の長手方向全幅で接触させることが望ましい。また、熱伝達部材７としてヒートパイプローラやアルミローラを使用することが望ましく、このようなヒートパイプローラやアルミローラを使用すると、加圧ローラ２の温度を効率良く均一にする効果が期待できる。   To cope with this, as shown in the drawing, the heat transfer member 7 is rotatably contacted with the surface of the pressure roller 2 so that the temperature distribution of the pressure roller 2 is uniform when the small size transfer paper 5 is passed. It was thought to make. In this case, it is desirable that the heat transfer member 7 is brought into contact with the full width of the pressure roller 2 in the longitudinal direction. Further, it is desirable to use a heat pipe roller or an aluminum roller as the heat transfer member 7, and when such a heat pipe roller or aluminum roller is used, an effect of making the temperature of the pressure roller 2 uniform efficiently can be expected.

しかしながら、熱伝達部材７としてヒートパイプローラやアルミローラを使用する場合は長手方向の熱の移動が良好であるが、径方向や円周方向の熱の移動も良好のため、加圧ローラ２から熱伝達部材７へ移動し、そこから雰囲気中へ逃げる（移動する）熱量も増加する。そのため加圧ローラ２の長手方向の温度分布を均一にする効果は期待できるものの、全体として温度が下がってしまい、結果的に熱効率が低下するという問題があった。   However, when a heat pipe roller or an aluminum roller is used as the heat transfer member 7, the heat transfer in the longitudinal direction is good, but the heat transfer in the radial direction and the circumferential direction is also good. The amount of heat that moves to the heat transfer member 7 and escapes (moves) from there to the atmosphere also increases. Therefore, although the effect of making the temperature distribution in the longitudinal direction of the pressure roller 2 uniform can be expected, there is a problem that the temperature is lowered as a whole, resulting in a decrease in thermal efficiency.

そこでこの発明は、前記従来のものの問題点を解決し、加圧ローラとの接触部から熱伝導部材の外周を伝わり、雰囲気へ熱が移動するのを防止し、熱効率を高めることができる定着装置を提供することを目的とする。   Accordingly, the present invention solves the problems of the prior art, prevents the heat from transferring to the atmosphere from the contact portion with the pressure roller, and prevents the heat from moving to the atmosphere, thereby improving the thermal efficiency. The purpose is to provide.

前記課題を解決するために、請求項１に記載の発明は、加圧ローラの表面に熱伝達部材を回転可能に接触させて配置した熱ローラ方式の定着装置において、前記熱伝達部材は、円筒体からなる内層断熱部材と、該部材の外周に嵌合して装着された円筒体からなる外層部材とを具え、該外層部材はその円周方向に良熱伝導部と断熱部が複数、交互に配置され、かつ前記加圧ローラは、回転停止したとき、その表面が熱伝達部材の断熱部に接触するようになっていることを特徴とする。 In order to solve the above-mentioned problem, the invention according to claim 1 is a heat roller type fixing device in which a heat transfer member is rotatably contacted with a surface of a pressure roller, and the heat transfer member is a cylinder. An inner layer heat insulating member made of a body and an outer layer member made of a cylindrical body fitted and attached to the outer periphery of the member. The outer layer member has a plurality of good heat conducting portions and heat insulating portions in the circumferential direction. When the rotation of the pressure roller is stopped, the surface of the pressure roller is in contact with the heat insulating portion of the heat transfer member .

請求項２に記載の発明は、請求項１において、熱伝達部材は、長手方向両端部に断熱部材を具えていることを特徴とする。請求項３に記載の発明は、請求項２において、熱伝達部材は、その長さが加圧ローラの長さ以上となっていて、両端部に設けた断熱部材が加圧ローラの両端部より外側に配置されていることを特徴とする。 The invention according to claim 2 is characterized in that, in claim 1, the heat transfer member includes a heat insulating member at both ends in the longitudinal direction. According to a third aspect of the present invention, in the second aspect , the length of the heat transfer member is equal to or greater than the length of the pressure roller, and the heat insulating members provided at both ends are provided at both ends of the pressure roller. It is arranged on the outside.

請求項４に記載の発明は、請求項１ないし３のいずれかにおいて、熱伝達部材の回転角度を検知するセンサと、このセンサからの検知信号を受けて、加圧ローラが回転停止したとき、加圧ローラの表面が熱伝達部材の断熱部に接触するように加圧ローラの回転を駆動制御する駆動制御手段とを具えたことを特徴とする。 According to a fourth aspect of the present invention, in any one of the first to third aspects, when the pressure roller stops rotating in response to a sensor that detects the rotation angle of the heat transfer member and a detection signal from the sensor, Drive control means for driving and controlling the rotation of the pressure roller so that the surface of the pressure roller is in contact with the heat insulating portion of the heat transfer member is provided.

請求項５に記載の発明は、請求項１ないし４のいずれかにおいて、熱伝達部材の外径をｄ、加圧ローラの外径をＤとすると、外径ｄと外径Ｄの関係が、ｄ＞Ｄの時、ｄ／Ｄ＝（整数とならない値）、ｄ＜Ｄの時、Ｄ／ｄ＝（整数とならない値）、またはｄ≠Ｄとなっていて、熱伝達部材と加圧ローラが、いつも同じ面で接触しないようになっていることを特徴とする。請求項６に記載の発明は、請求項１ないし５のいずれかにおいて、熱伝達部材は、その表面が加圧ローラの表面と接触する部分を除いて筒状の断熱部材で覆われていることを特徴とする。 The invention according to claim 5 is the invention according to any one of claims 1 to 4 , wherein the outer diameter of the heat transfer member is d and the outer diameter of the pressure roller is D, the relationship between the outer diameter d and the outer diameter D is When d> D, d / D = (value that does not become an integer), when d <D, D / d = (value that does not become an integer), or d ≠ D, and the heat transfer member and the pressure roller However, it is characterized by not always touching on the same surface. A sixth aspect of the present invention is that, in any one of the first to fifth aspects, the heat transfer member is covered with a cylindrical heat insulating member except for a portion whose surface is in contact with the surface of the pressure roller. It is characterized by.

この発明は、前記のようであって、熱伝達部材は、円筒体からなる内層断熱部材と、該部材の外周に嵌合して装着された円筒体からなる外層部材とを具え、該外層部材はその円周方向に良熱伝導部と断熱部が複数、交互に配置され、前記加圧ローラは、回転停止したとき、その表面が熱伝達部材の断熱部に接触するようになっているので、加圧ローラと熱伝達部材との接触部から熱伝達部材の外周を伝わり、雰囲気へ逃げる熱の移動を断熱部によって防止できる。したがって、加圧ローラ全体としての温度低下を抑止でき、熱効率を高めることができる。また、加圧ローラは、回転停止したとき、その表面が熱伝達部材の断熱部に接触するようになっているので、加圧ローラの回転停止中に、加圧ローラとの接触部から熱伝導部材への熱の移動を防止することができる。 The present invention is as described above, and the heat transfer member includes an inner layer heat insulating member made of a cylindrical body and an outer layer member made of a cylindrical body fitted to the outer periphery of the member, and the outer layer member In the circumferential direction, a plurality of good heat conducting parts and heat insulating parts are alternately arranged, and when the pressure roller stops rotating, its surface comes into contact with the heat insulating part of the heat transfer member. The heat transfer from the contact portion between the pressure roller and the heat transfer member along the outer periphery of the heat transfer member and escape to the atmosphere can be prevented by the heat insulating portion. Therefore, the temperature drop as the whole pressure roller can be suppressed, and the thermal efficiency can be increased. In addition, when the rotation of the pressure roller is stopped, the surface of the pressure roller comes into contact with the heat insulating portion of the heat transfer member. Heat transfer to the member can be prevented.

この発明の一実施の形態を、図面を参照して説明する。   An embodiment of the present invention will be described with reference to the drawings.

図１は、実施の形態に係る定着装置の概略構成を示す正面図、図２は図１の右側から見た側面図である。これら図面において従来と同様な部分には同一符号を付してその詳細な説明は省略し、主に異なる部分について以下に説明する。   FIG. 1 is a front view showing a schematic configuration of a fixing device according to the embodiment, and FIG. 2 is a side view seen from the right side of FIG. In these drawings, the same parts as those in the prior art are denoted by the same reference numerals, detailed description thereof is omitted, and different parts will be mainly described below.

１１は小ローラ状の回転体からなる熱伝達部材で、加圧ローラ２の表面にその長手方向全幅にわたり接触し、加圧ローラ２の回転により連れ回るようになっている。この熱伝達部材１１は、図３に詳細断面を示すように中空円筒体からなる内層断熱部材１２と、該部材の外周に嵌合して装着された同じく中空円筒体からなる外層部材１３とからなっている。外層部材１３はその円周方向に良熱伝導部１４と断熱部１５が複数、交互に配置された構成となっている。良熱伝導部１４と断熱部１５の円周方向の長さは、ほぼ均等になっている。良熱伝導部１４としてはアルミ等の金属が適し、内層断熱部材１２及び外層部材１３の断熱部１５としては樹脂が適している。熱伝達部材１１の両端部には断熱部材１６が配設されている。断熱部材１６が配設された熱伝達部材１１の長さは、図２から明らかなように加圧ローラ２の長さと同じになっている。したがって、断熱部材１６は加圧ローラ２の両端部より外側に配置された状態になる。断熱部材１６としては樹脂、ゴム、発泡ゴム、フェルトが適している。   Reference numeral 11 denotes a heat transfer member made of a small roller-like rotating body, which is in contact with the surface of the pressure roller 2 over its entire length in the longitudinal direction, and is rotated along with the rotation of the pressure roller 2. The heat transfer member 11 includes an inner layer heat insulating member 12 made of a hollow cylindrical body as shown in FIG. 3 and an outer layer member 13 made of the same hollow cylindrical body fitted to the outer periphery of the member. It has become. The outer layer member 13 has a configuration in which a plurality of good heat conducting portions 14 and heat insulating portions 15 are alternately arranged in the circumferential direction. The circumferential lengths of the good heat conducting portion 14 and the heat insulating portion 15 are substantially uniform. A metal such as aluminum is suitable as the good heat conducting portion 14, and a resin is suitable as the heat insulating portion 15 of the inner layer heat insulating member 12 and the outer layer member 13. A heat insulating member 16 is disposed at both ends of the heat transfer member 11. The length of the heat transfer member 11 provided with the heat insulating member 16 is the same as the length of the pressure roller 2 as is apparent from FIG. Therefore, the heat insulating member 16 is disposed outside the both end portions of the pressure roller 2. As the heat insulating member 16, resin, rubber, foam rubber, and felt are suitable.

この実施の形態においても温度検知部材４は、定着ローラ１の長手方向端部に配置されている。温度検知部材４により定着ローラ１の端部の温度が検知されると、この検知信号が図示しない温度制御装置に送られ、該制御装置により定着ローラ１が所定の温度となるようヒータ３が制御される。尚、温度検知部材４は、定着ローラ１の長手方向中央部に配置してもよい。   Also in this embodiment, the temperature detection member 4 is arranged at the end portion of the fixing roller 1 in the longitudinal direction. When the temperature of the end of the fixing roller 1 is detected by the temperature detection member 4, this detection signal is sent to a temperature control device (not shown), and the heater 3 controls the fixing roller 1 to reach a predetermined temperature by the control device. Is done. Note that the temperature detection member 4 may be disposed at the center in the longitudinal direction of the fixing roller 1.

熱伝達部材１１が前記のような構成からなるので、定着装置が使用されない待機中とか、回転停止中には加圧ローラ２も回転停止となるが、このようなときに加圧ローラ２の表面が熱伝達部材１１の断熱部１５に接触するようにすることが可能となる。これにより、加圧ローラ２からの熱を断熱部１５で遮断して、雰囲気へ熱が移動するのを防止することができる。加圧ローラ２が回転停止したとき、その表面が熱伝達部材１１の断熱部１５に接触するようにする手段としては、種々のものが考えられるが、例えば実機の組み付け時に加圧ローラ２の回転を駆動する図示しないモータを熱伝達部材１１の回転との関係で予め設定した制御値に基づき制御することが考えられる。   Since the heat transfer member 11 is configured as described above, the pressure roller 2 also stops rotating when the fixing device is not used or when the rotation is stopped. Can be brought into contact with the heat insulating portion 15 of the heat transfer member 11. Thereby, the heat from the pressure roller 2 can be blocked by the heat insulating portion 15 to prevent the heat from moving to the atmosphere. Various means can be conceived for bringing the surface of the pressure roller 2 into contact with the heat insulating portion 15 of the heat transfer member 11 when the rotation of the pressure roller 2 is stopped. It is conceivable to control a motor (not shown) that drives the motor based on a control value set in advance in relation to the rotation of the heat transfer member 11.

図４，５は、加圧ローラ２が回転停止したとき、その表面が熱伝達部材１１の断熱部１５に接触するよう自動制御する一例を示す。すなわち、この例では熱伝達部材１１の軸端に設置されて熱伝達部材１１と同期して回転するフィラー２１と、その近傍に設置したフォトセンサ２２により熱伝達部材１１の断熱部１５の位置（回転角度）を検知する一方、この検知信号を受ける図示しない制御手段が加圧ローラ２を回転駆動する図示しないモータを、加圧ローラ２が回転停止したとき、その表面が熱伝達部材１１の断熱部１５に接触するように制御する。これにより、前記と同様に加圧ローラ２からの熱を断熱部１５で遮断して雰囲気へ熱が移動するのを防止することができる。   4 and 5 show an example in which when the pressure roller 2 stops rotating, the surface is automatically controlled so as to come into contact with the heat insulating portion 15 of the heat transfer member 11. In other words, in this example, the filler 21 that is installed at the shaft end of the heat transfer member 11 and rotates in synchronization with the heat transfer member 11 and the position of the heat insulating portion 15 of the heat transfer member 11 by the photosensor 22 installed in the vicinity thereof ( When the pressure roller 2 stops rotating, the surface of the heat transfer member 11 is insulated. It controls so that the part 15 may be contacted. Thereby, it is possible to prevent the heat from the pressure roller 2 from being transferred to the atmosphere by blocking the heat from the pressure roller 2 by the heat insulating portion 15 as described above.

実施の形態においては、熱伝達部材１１の外径をｄ、加圧ローラの外径をＤとすると、外径ｄと外径Ｄの関係は、
ｄ＞Ｄの時、ｄ／Ｄ＝（整数とならない値）
ｄ＜Ｄの時、Ｄ／ｄ＝（整数とならない値）
またはｄ≠Ｄ
となっている。 In the embodiment, if the outer diameter of the heat transfer member 11 is d and the outer diameter of the pressure roller is D, the relationship between the outer diameter d and the outer diameter D is
When d> D, d / D = (value that does not become an integer)
When d <D, D / d = (value that does not become an integer)
Or d ≠ D
It has become.

熱伝達部材１１の外径ｄと加圧ローラ２の外径Ｄを前記のようにすることにより、加圧ローラ２の回転停止中（回転中も）、熱伝達部材１１と加圧ローラ２が、いつも同じ面で接触することが避けられ、加圧ローラ２の温度分布の均一化が可能となる。   By setting the outer diameter d of the heat transfer member 11 and the outer diameter D of the pressure roller 2 as described above, when the rotation of the pressure roller 2 is stopped (even during rotation), the heat transfer member 11 and the pressure roller 2 are The contact on the same surface is always avoided, and the temperature distribution of the pressure roller 2 can be made uniform.

熱伝達部材１１から雰囲気に熱が移動するのをより効率的に行うため、図６に示すような断熱部材２５を設けてもよい。この断熱部材２５は、熱伝達部材１１を同心状にすっぽりと覆う形の略半円筒状に形成され、唯一開口した開口部２６を接触した加圧ローラ２の表面に向けて配置されている。断熱部材２５としては、耐熱樹脂、シリコーンゴム、耐熱フェルトが適している。   In order to more efficiently transfer heat from the heat transfer member 11 to the atmosphere, a heat insulating member 25 as shown in FIG. 6 may be provided. The heat insulating member 25 is formed in a substantially semi-cylindrical shape that completely covers the heat transfer member 11 concentrically, and is disposed toward the surface of the pressure roller 2 that is in contact with the opening 26 that is only opened. As the heat insulating member 25, heat resistant resin, silicone rubber, and heat resistant felt are suitable.

前記により熱伝達部材１１は、その表面が加圧ローラ２の表面と接触する部分を除いて断熱部材２５で覆われることとなるので、加圧ローラ２から熱伝達部材１１へ、熱伝達部材１１から雰囲気への熱の移動を効率的に防止することが可能となるとともに、加圧ローラ２の温度分布均一化がより向上することが可能となる。   As described above, the heat transfer member 11 is covered with the heat insulating member 25 except for a portion where the surface of the heat transfer member 11 is in contact with the surface of the pressure roller 2, so that the heat transfer member 11 is transferred from the pressure roller 2 to the heat transfer member 11. It is possible to efficiently prevent heat transfer from the atmosphere to the atmosphere, and it is possible to further improve the uniform temperature distribution of the pressure roller 2.

前記実施の形態で示した熱伝達部材１１は、好ましい一例を示したにすぎず、他の設計例を排除するものではない。例えば、熱伝達部材１１を外層部材１３のみで構成するとか、外層部材１３の良熱伝導部１４と断熱部１５を適宜の数にするとか、あるいは内層断熱部材１２及び外層部材１３の良熱伝導部１４と断熱部１５の材質を実施の形態で示したもの以外とするとか、は任意である。また、この実施の形態では加圧ローラ２とニップを形成する部材として定着ローラ１を示したが、ニップ形成部材としてはこのような定着ローラ１だけではなく、定着ローラと加熱ローラの間に巻き掛けられた無端状の定着ベルトとしてもよいことは勿論である。   The heat transfer member 11 shown in the above embodiment is merely a preferable example, and does not exclude other design examples. For example, the heat transfer member 11 is constituted only by the outer layer member 13, the good heat conducting portion 14 and the heat insulating portion 15 of the outer layer member 13 are appropriately set, or the good heat conduction of the inner layer heat insulating member 12 and the outer layer member 13. Whether the material of the part 14 and the heat insulating part 15 is other than that shown in the embodiment is arbitrary. In this embodiment, the fixing roller 1 is shown as a member that forms a nip with the pressure roller 2. However, the nip forming member is not limited to such a fixing roller 1, but is wound between the fixing roller and the heating roller. Of course, an endless fixing belt that is hung may be used.

次に、特許請求の範囲の請求項２以下に記載した発明の特有な効果について説明する。請求項２に記載の発明によれば、熱伝達部材は、長手方向両端部に断熱部材を具えているので、熱伝達部材の両端部から雰囲気へ熱の移動を防止することができる。 Next, a characteristic effect of the invention described in claim 2 and the following claims will be described. According to the second aspect of the present invention, since the heat transfer member includes the heat insulating members at both ends in the longitudinal direction, it is possible to prevent the heat transfer from the both ends of the heat transfer member to the atmosphere.

請求項３に記載の発明によれば、熱伝達部材は、その長さが加圧ローラの長さ以上となっていて、両端部に設けた断熱部材が加圧ローラの両端部より外側に配置されているので、加圧ローラの長手方向の温度分布を加圧ローラ長手方向全域に渡って均一にする効果と、熱伝達部材の両端部から雰囲気へ熱の移動を防止する効果を効率良く両立させることができる。 According to the invention described in claim 3 , the length of the heat transfer member is equal to or longer than the length of the pressure roller, and the heat insulating members provided at both ends are arranged outside the both ends of the pressure roller. Therefore, both the effect of making the temperature distribution in the longitudinal direction of the pressure roller uniform across the entire length direction of the pressure roller and the effect of preventing the movement of heat from both ends of the heat transfer member to the atmosphere are efficiently achieved. Can be made.

請求項４に記載の発明によれば、熱伝達部材の回転角度を検知するセンサと、このセンサからの検知信号を受けて、加圧ローラが回転停止したとき、加圧ローラの表面が熱伝達部材の断熱部に接触するように加圧ローラの回転を駆動制御する駆動制御手段とを具えたので、請求項１に記載の発明の効果を自動制御により達成することが可能となる。 According to the fourth aspect of the present invention, when the rotation of the pressure roller is stopped upon receiving the detection signal from the sensor and the rotation angle of the heat transfer member, the surface of the pressure roller is heated. Since the drive control means for driving and controlling the rotation of the pressure roller so as to contact the heat insulating portion of the member is provided, the effect of the invention of claim 1 can be achieved by automatic control.

請求項５に記載の発明によれば、熱伝達部材の外径をｄ、加圧ローラの外径をＤとすると、外径ｄと外径Ｄの関係が、ｄ＞Ｄの時、ｄ／Ｄ＝（整数とならない値）、ｄ＜Ｄの時、Ｄ／ｄ＝（整数とならない値）、またはｄ≠Ｄとなっていて、熱伝達部材と加圧ローラが、いつも同じ面で接触しないようになっているので、加圧ローラの回転停止中（回転中も）、熱伝達部材と加圧ローラが、いつも同じ面で接触することが避けられ、加圧ローラの温度分布の均一化が可能となる。 According to the fifth aspect of the present invention, when the outer diameter of the heat transfer member is d and the outer diameter of the pressure roller is D, when the relationship between the outer diameter d and the outer diameter D is d> D, d / When D = (value that does not become an integer), d <D, D / d = (value that does not become an integer) or d ≠ D, and the heat transfer member and the pressure roller do not always contact on the same surface. Therefore, when the rotation of the pressure roller is stopped (even during rotation), the heat transfer member and the pressure roller are always prevented from contacting on the same surface, and the temperature distribution of the pressure roller is made uniform. It becomes possible.

請求項６に記載の発明によれば、熱伝達部材は、その表面が加圧ローラの表面と接触する部分を除いて筒状の断熱部材で覆われているので、加圧ローラから熱伝達部材へ、熱伝達部材から雰囲気への熱の移動を防止する効果をより向上させることができる。 According to the sixth aspect of the present invention, the heat transfer member is covered with the cylindrical heat insulating member except for the portion where the surface is in contact with the surface of the pressure roller. Thus, the effect of preventing the heat transfer from the heat transfer member to the atmosphere can be further improved.

この発明の一実施の形態に係る定着装置の概略構成を示す正面図である。1 is a front view showing a schematic configuration of a fixing device according to an embodiment of the present invention. 図１の右側から見た側面図である。It is the side view seen from the right side of FIG. 熱伝達部材の詳細断面図である。It is a detailed sectional view of a heat transfer member. 加圧ローラの回転停止中の、熱伝達部材の加圧ローラに対する接触状態を示す図面である。It is drawing which shows the contact state with respect to the pressurization roller of the heat transfer member in the rotation stop of a pressurization roller. 熱伝達部材の回転停止位置を制御するセンサを示し、（Ａ）はその平面図、（Ｂ）は正面図である。The sensor which controls the rotation stop position of a heat transfer member is shown, (A) is the top view, (B) is a front view. 熱伝達部材を断熱部材で覆った例を示す正面図である。It is a front view which shows the example which covered the heat-transfer member with the heat insulation member. 従来の定着装置の概略構成を示す正面図である。FIG. 10 is a front view illustrating a schematic configuration of a conventional fixing device. 従来の定着装置の概略構成を示す側面図である。FIG. 9 is a side view illustrating a schematic configuration of a conventional fixing device.

符号の説明Explanation of symbols

１ 定着ローラ ２ 加圧ローラ
３ ヒータ ４ 温度検知部材
５ 記録紙（転写紙） ６ 未定着トナー像
７ 熱伝達部材 １１ 熱伝達部材
１２ 内層断熱部材 １３ 外層部材
１４ 良熱伝導部 １５ 断熱部
１６ 断熱部材 ２１ フィラー
２２ フォトセンサ ２５ 断熱部材
２６ 開口部 DESCRIPTION OF SYMBOLS 1 Fixing roller 2 Pressure roller 3 Heater 4 Temperature detection member 5 Recording paper (transfer paper) 6 Unfixed toner image 7 Heat transfer member 11 Heat transfer member 12 Inner layer heat insulation member 13 Outer layer member 14 Good heat conduction part 15 Heat insulation part 16 Heat insulation Member 21 Filler 22 Photosensor 25 Heat insulation member 26 Opening

Claims (6)

加圧ローラの表面に熱伝達部材を回転可能に接触させて配置した熱ローラ方式の定着装置において、前記熱伝達部材は、円筒体からなる内層断熱部材と、該部材の外周に嵌合して装着された円筒体からなる外層部材とを具え、該外層部材はその円周方向に良熱伝導部と断熱部が複数、交互に配置され、かつ前記加圧ローラは、回転停止したとき、その表面が熱伝達部材の断熱部に接触するようになっていることを特徴とする定着装置。 In a heat roller type fixing device in which a heat transfer member is rotatably contacted with a surface of a pressure roller, the heat transfer member is fitted to an inner layer heat insulating member made of a cylindrical body and an outer periphery of the member. An outer layer member comprising a mounted cylindrical body, wherein the outer layer member has a plurality of good heat conducting portions and heat insulating portions arranged alternately in the circumferential direction, and when the pressure roller stops rotating, A fixing device having a surface that comes into contact with a heat insulating portion of a heat transfer member . 熱伝達部材は、長手方向両端部に断熱部材を具えている請求項１に記載の定着装置。   The fixing device according to claim 1, wherein the heat transfer member includes heat insulating members at both ends in the longitudinal direction. 熱伝達部材は、その長さが加圧ローラの長さ以上となっていて、両端部に設けた断熱部材が加圧ローラの両端部より外側に配置されている請求項２に記載の定着装置。 The fixing device according to claim 2 , wherein the heat transfer member has a length that is equal to or greater than the length of the pressure roller, and heat insulating members provided at both ends are disposed outside the both ends of the pressure roller. . 熱伝達部材の回転角度を検知するセンサと、このセンサからの検知信号を受けて、加圧ローラが回転停止したとき、加圧ローラの表面が熱伝達部材の断熱部に接触するように加圧ローラの回転を駆動制御する駆動制御手段とを具えた請求項１ないし３のいずれかに記載の定着装置。 A sensor that detects the rotation angle of the heat transfer member and a detection signal from the sensor, and when the pressure roller stops rotating, pressurizes so that the surface of the pressure roller contacts the heat insulating portion of the heat transfer member the fixing device according to any one of claims 1 equipped with a driving control means for driving and controlling the rotation of the roller 3. 熱伝達部材の外径をｄ、加圧ローラの外径をＤとすると、外径ｄと外径Ｄの関係が、
ｄ＞Ｄの時、ｄ／Ｄ＝（整数とならない値）
ｄ＜Ｄの時、Ｄ／ｄ＝（整数とならない値）
またはｄ≠Ｄとなっていて、熱伝達部材と加圧ローラが、いつも同じ面で接触しないようになっている請求項１ないし４のいずれかに記載の定着装置。 When the outer diameter of the heat transfer member is d and the outer diameter of the pressure roller is D, the relationship between the outer diameter d and the outer diameter D is
When d> D, d / D = (value that does not become an integer)
When d <D, D / d = (value that does not become an integer)
Or have a d ≠ D, the heat transfer member and the pressure roller is always fixing device according to any one of 4 to claims 1 and so as not to contact the same surface. 熱伝達部材は、その表面が加圧ローラの表面と接触する部分を除いて筒状の断熱部材で覆われている請求項１ないし５のいずれかに記載の定着装置。 The heat transfer member, fixing device according to any one of claims 1 to 5 the surface is covered with a cylindrical insulating member except for a portion in contact with the surface of the pressure roller.
JP2005093394A 2005-03-29 2005-03-29 Fixing device Expired - Fee Related JP4634838B2 (en)

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JP4701044B2 (en) * 2005-08-31 2011-06-15 株式会社リコー Fixing apparatus and image forming apparatus
JP2009048075A (en) * 2007-08-22 2009-03-05 Ricoh Co Ltd Fixing device and image forming apparatus

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