JPH0527648A - Fixing device - Google Patents
Fixing deviceInfo
- Publication number
- JPH0527648A JPH0527648A JP20644891A JP20644891A JPH0527648A JP H0527648 A JPH0527648 A JP H0527648A JP 20644891 A JP20644891 A JP 20644891A JP 20644891 A JP20644891 A JP 20644891A JP H0527648 A JPH0527648 A JP H0527648A
- Authority
- JP
- Japan
- Prior art keywords
- fixing roller
- temperature
- image portion
- fixing
- roller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Fixing For Electrophotography (AREA)
Abstract
(57)【要約】
【目的】 温度検知部材による定着ローラの画像部の磨
耗をなくし、且つ、定着ローラの画像部の温度を正確に
検知し、更に定着ローラが異常高温になるのを確実に防
止する。
【構成】 内側にヒータ１０１を配設した定着ローラ１
０２と、定着ローラ１０２の芯金内部に画像部と非画像
部にわたって配設されたステック状のヒートパイプ１０
３と、定着ローラ１０２に隣接して配設される加圧ロー
ラ１０４と、定着ローラ１０２の非画像部に接触させて
配設されるサーミスタ１０５とから構成される。
(57) [Abstract] [Purpose] Eliminates wear of the image portion of the fixing roller due to the temperature detection member, accurately detects the temperature of the image portion of the fixing roller, and ensures that the fixing roller becomes abnormally hot. To prevent. [Structure] Fixing roller 1 having heater 101 inside
02, and a stick-shaped heat pipe 10 disposed inside the core of the fixing roller 102 over the image portion and the non-image portion.
3, a pressure roller 104 disposed adjacent to the fixing roller 102, and a thermistor 105 disposed in contact with the non-image portion of the fixing roller 102.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、熱ローラ定着方式の定
着装置に関し、より詳細には、定着ローラ内部にヒート
パイプを有した定着装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat roller fixing type fixing device, and more particularly to a fixing device having a heat pipe inside a fixing roller.
【０００２】[0002]
【従来の技術】熱ローラ定着方式の定着装置において
は、定着ローラ内部に熱源としてヒータを配設してい
る。定着ローラ表面温度は、温度検知部材（例えば、サ
ーミスタ）を定着ローラに接触させて検知され、該検知
結果に基づいて、定着ローラの表面温度をある所定の温
度に維持するようにヒータの制御が行われる。このヒー
タは、通常、出力分布が一様ではなく、画像部（記録紙
と接触する部分）は記録紙に熱伝達するために非画像部
（記録紙と接触しない部分）よりも必要とする熱量が大
きいため、これに対応させた出力分布となっている。ま
た、定着ローラ，定着ローラに隣接する加圧ローラの表
面の材質の組み合わせとしては、テフロン／シリコンゴ
ムの組み合わせが一般的である。2. Description of the Related Art In a heat roller fixing type fixing device, a heater is provided as a heat source inside the fixing roller. The surface temperature of the fixing roller is detected by bringing a temperature detecting member (for example, a thermistor) into contact with the fixing roller, and based on the detection result, the heater is controlled to maintain the surface temperature of the fixing roller at a predetermined temperature. Done. This heater usually has a non-uniform output distribution, and the amount of heat required for the image part (the part that contacts the recording paper) is higher than that for the non-image part (the part that does not contact the recording paper) to transfer heat to the recording paper. Is large, the output distribution corresponds to this. Further, as a combination of materials of the surface of the fixing roller and the pressure roller adjacent to the fixing roller, a combination of Teflon / silicon rubber is generally used.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
定着装置によれば、温度検知部材を画像部に接触させて
定着ローラ表面の温度を検知する場合、テフロン等の離
型部材が温度検知部材により磨耗するため、該磨耗した
部分において、トナーが定着不良を起こしたり，或い
は，記録紙にシワが発生して画像品質を低下させる恐れ
があるという問題点や、また、非画像部は熱を記録紙に
伝達しないことから蓄熱し易いため、例えば、定着処理
を連続で行うと、画像部の温度は所定の温度に維持され
るが非画像部は蓄熱して異常高温となり、定着ローラに
圧接した加圧ローラが変形或いは溶融する恐れがあると
いう問題点があった。However, according to the conventional fixing device, when the temperature detecting member is brought into contact with the image portion to detect the temperature of the surface of the fixing roller, the releasing member such as Teflon is operated by the temperature detecting member. Since the toner is abraded, there is a possibility that the toner may cause fixing failure in the abraded portion, or wrinkles may occur on the recording paper to deteriorate the image quality, and heat may be recorded in the non-image portion. Since it does not transfer to the paper, it easily accumulates heat. For example, if the fixing process is performed continuously, the temperature of the image part will be maintained at a predetermined temperature, but the non-image part will accumulate heat and become an abnormally high temperature, and it is pressed against the fixing roller. There is a problem that the pressure roller may be deformed or melted.
【０００４】また、温度検知部材を非画像部に接触させ
て定着ローラの温度を検知する場合、ヒータの出力が非
画像部よりも画像部の方が大きいため、非画像部の温度
をある所定の温度に維持している間に画像部が異常高温
となり、定着ローラに圧接する加圧ローラが変形或いは
溶融する恐れがあるという問題点や、また、非画像部の
温度をある所定の温度に維持して定着処理を連続して行
うと、画像部は熱を記録紙に伝達するため、画像部温度
が定着可能温度より低下し、定着不良が発生する恐れが
あるという問題点があった。When the temperature detecting member is brought into contact with the non-image portion to detect the temperature of the fixing roller, the output of the heater is larger in the image portion than in the non-image portion, so the temperature of the non-image portion is set to a predetermined value. The temperature of the image area becomes abnormally high while it is maintained at the above temperature, and the pressure roller that is in pressure contact with the fixing roller may be deformed or melted. If the fixing process is continuously performed while maintaining the temperature, the image portion transfers heat to the recording paper, so that the temperature of the image portion becomes lower than the fixable temperature, and there is a possibility that defective fixing may occur.
【０００５】本発明は上記に鑑みてなされたものであっ
て、温度検知部材による定着ローラの画像部の磨耗をな
くし、且つ、定着ローラの画像部の温度を正確に検知す
ることを第１の目的とする。The present invention has been made in view of the above, and it is a first object of the present invention to eliminate the abrasion of the image portion of the fixing roller by the temperature detecting member and to accurately detect the temperature of the image portion of the fixing roller. To aim.
【０００６】また、本発明は上記に鑑みてなされたもの
であって、定着ローラが異常高温になるのを確実に防止
することを第２の目的とする。Further, the present invention has been made in view of the above, and a second object thereof is to reliably prevent the fixing roller from abnormally high temperature.
【０００７】[0007]
【課題を解決するための手段】本発明は上記の目的を達
成するために、ヒータを内設した定着ローラと、定着ロ
ーラに隣接した加圧ローラとを有する定着装置におい
て、定着ローラの内部に定着ローラの記録紙が通紙する
画像部と記録紙が通紙しない非画像部にわたって配設さ
れるヒートパイプと、非画像部に接触し、定着ローラの
温度を検知する温度検知手段とを具備した定着装置を提
供するものである。In order to achieve the above-mentioned object, the present invention provides a fixing device having a fixing roller having a heater therein and a pressure roller adjacent to the fixing roller. The fixing roller is provided with a heat pipe arranged over an image portion of the fixing roller through which the recording paper passes, a non-image portion through which the recording paper does not pass, and a temperature detecting unit that contacts the non-image portion and detects the temperature of the fixing roller. The present invention provides a fixing device.
【０００８】また、本発明は上記の目的を達成するため
に、ヒータを内設した定着ローラと、定着ローラに隣接
した加圧ローラとを有する定着装置において、定着ロー
ラの内部に定着ローラの記録紙が通紙する画像部と記録
紙が通紙しない非画像部にわたって配設されるヒートパ
イプと、非画像部に接触する定着ローラの温度を検知す
る温度検知手段，及び，定着ローラが所定の温度を越え
た場合にヒータへの通電を遮断させる温度調節手段とを
具備した定着装置を提供するものである。なお、前述し
た構成において、温度検知手段，及び，温度調節手段
は、定着ローラの軸方向に対し、異なる位置に接触させ
ることが望ましい。In order to achieve the above-mentioned object, the present invention is a fixing device having a fixing roller having a heater therein and a pressure roller adjacent to the fixing roller, and recording of the fixing roller inside the fixing roller. A heat pipe arranged over the image portion where the paper passes and the non-image portion where the recording paper does not pass, a temperature detecting means for detecting the temperature of the fixing roller in contact with the non-image portion, and the fixing roller have a predetermined size. (EN) A fixing device provided with a temperature adjusting means for cutting off the power supply to a heater when the temperature exceeds the temperature. In the above-mentioned configuration, it is desirable that the temperature detecting means and the temperature adjusting means are brought into contact with different positions in the axial direction of the fixing roller.
【０００９】[0009]
【作用】本発明による定着装置において、定着ローラ内
部に画像部と非画像部にわたってヒートパイプを配設す
ることにより、定着ローラの軸方向における温度を略一
定にする。サーミスタ，及び，サーモスタットは、定着
ローラの非画像部の軸方向に対して異なる位置に接触さ
せるように配設し、定着ローラ上への密着性を向上させ
て、温度検知の精度を向上させる。In the fixing device according to the present invention, the temperature of the fixing roller in the axial direction is made substantially constant by disposing the heat pipe inside the fixing roller over the image portion and the non-image portion. The thermistor and the thermostat are arranged so as to come into contact with different positions in the axial direction of the non-image portion of the fixing roller, improve the adhesion to the fixing roller, and improve the accuracy of temperature detection.
【００１０】[0010]
【実施例】以下、本発明による定着装置の実施例につい
て、図面を参照しながら説明する。図１は、実施例１の
定着装置の概略断面図を示し、内側にヒータ（本実施例
では、キセノンランプ）１０１を配設した定着ローラ１
０２と、定着ローラ１０２の芯金内部に配設されたステ
ック状のヒートパイプ１０３と、定着ローラ１０２に隣
接して配設される加圧ローラ１０４と、定着ローラ１０
２の非画像部に接触させて配設されるサーミスタ（温度
検知部材）１０５とから構成されている。なお、本実施
例において、定着ローラ１０２表面はテフロンで形成さ
れ、加圧ローラ１０４表面はシリコンゴムで形成されて
いる。Embodiments of the fixing device according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional view of the fixing device according to the first embodiment, in which a fixing roller 1 having a heater (a xenon lamp in this embodiment) 101 is provided inside.
02, a stick-shaped heat pipe 103 arranged inside the core of the fixing roller 102, a pressure roller 104 arranged adjacent to the fixing roller 102, and the fixing roller 10.
The thermistor (temperature detecting member) 105 is provided so as to be in contact with the second non-image portion. In this embodiment, the surface of the fixing roller 102 is made of Teflon, and the surface of the pressure roller 104 is made of silicon rubber.
【００１１】以上の構成において、その動作を説明す
る。定着ローラ１０２表面は、常にある所定の温度（定
着温度）に維持するため、サーミスタ１０５で表面温度
が検知され、該検知結果に基づいてヒータ１０１のオン
／オフ制御が行われる。定着ローラ１０２に隣接して配
設された加圧ローラ１０４は、図示しない加圧バネによ
り定着ローラ１０２側に加圧されており、定着ローラ１
０２と加圧ローラ１０４とは一定圧力で圧接し、ニップ
を形成している。記録紙に担持されたトナーは、該ニッ
プ間を通過し、加熱圧接されて、記録紙に定着される。The operation of the above configuration will be described. Since the surface of the fixing roller 102 is always maintained at a predetermined temperature (fixing temperature), the surface temperature is detected by the thermistor 105, and on / off control of the heater 101 is performed based on the detection result. The pressure roller 104 disposed adjacent to the fixing roller 102 is pressed toward the fixing roller 102 by a pressure spring (not shown).
02 and the pressure roller 104 are pressed against each other at a constant pressure to form a nip. The toner carried on the recording paper passes through the nip, is heated and pressed, and is fixed on the recording paper.
【００１２】ここで、ヒートパイプ１０３について説明
する。定着ローラ１０２の画像部と非画像部にわたって
配設されているヒートパイプ１０３は、銅製で中が空洞
の円柱状の形状をしている。。中の空洞の部分には所定
量の水が封入されており、定着装置が動作している場
合、ヒータ１０１により加熱されて封入された水は水蒸
気となっている。The heat pipe 103 will be described below. The heat pipe 103 provided over the image portion and the non-image portion of the fixing roller 102 is made of copper and has a hollow cylindrical shape. . A predetermined amount of water is sealed in the hollow portion, and when the fixing device is operating, the water heated and sealed by the heater 101 is steam.
【００１３】図２は、定着処理を連続して行った場合に
おいて、定着ローラ１０２の軸方向に対する定着ローラ
１０２表面温度の関係を示す説明図である。同図におい
て、実線は定着ローラ１０２表面の温度、一点鎖線はヒ
ートパイプ１０３の温度、破線はヒートパイプを配設し
ていない場合の定着ローラ表面温度を各々示す。図示の
如く、ヒートパイプを配設していない定着ローラ表面
は、定着処理を連続して行うことにより軸方向に対して
大きな温度勾配が生じているのがわかる。これは、画像
部で温度検知をする場合、非画像部が異常高温になる恐
れが、非画像部で温度検知をする場合、画像部の温度が
定着温度より低下する恐れがあることを意味している。FIG. 2 is an explanatory diagram showing the relationship between the surface temperature of the fixing roller 102 and the axial direction of the fixing roller 102 when the fixing process is continuously performed. In the figure, the solid line shows the temperature of the surface of the fixing roller 102, the dashed line shows the temperature of the heat pipe 103, and the broken line shows the surface temperature of the fixing roller when no heat pipe is provided. As shown in the figure, it can be seen that a large temperature gradient is generated in the axial direction on the surface of the fixing roller on which the heat pipe is not provided by continuously performing the fixing process. This means that when the temperature is detected in the image area, the non-image area may have an abnormally high temperature, and when the temperature is detected in the non-image area, the temperature of the image area may be lower than the fixing temperature. ing.
【００１４】一方、一点鎖線で示すヒートパイプ１０３
温度は軸方向に対して温度勾配がなく、温度ＴH で一定
である。これは、ヒートパイプ１０３内に温度勾配が生
じても、高温となっている水蒸気の分子速度が大きく、
熱拡散が速いためである。そのため、定着ローラ１０２
にヒートパイプ１０３を配設した場合、実線で示す定着
ローラ１０２表面温度は、画像部と非画像部の境界付近
において若干の温度勾配が見られるだけである。換言す
れば、サーミスタ１０５を非画像部に接触させて温度検
知しても、非画像部で検知した温度ＴR は画像部温度と
殆ど差がないため、画像部温度を正確に検知できる。ま
た、定着ローラ１０２の軸方向における温度勾配が小さ
いため、定着ローラ１０２のある部分が局所的に異常高
温になることがなく、安全性を向上できる。On the other hand, the heat pipe 103 shown by a chain line
The temperature has no temperature gradient in the axial direction and is constant at the temperature T H. This is because even if a temperature gradient occurs in the heat pipe 103, the molecular velocity of water vapor at high temperature is large,
This is because the heat diffusion is fast. Therefore, the fixing roller 102
In the case where the heat pipe 103 is provided in the above, the surface temperature of the fixing roller 102 shown by the solid line shows only a slight temperature gradient near the boundary between the image portion and the non-image portion. In other words, even if the temperature is detected by bringing the thermistor 105 into contact with the non-image portion, the temperature T R detected in the non-image portion has almost no difference from the image portion temperature, so that the image portion temperature can be accurately detected. Further, since the temperature gradient in the fixing roller 102 in the axial direction is small, a certain portion of the fixing roller 102 does not locally have an abnormally high temperature, and the safety can be improved.
【００１５】図３は、実施例２の定着装置における定着
ローラ１０２の非画像部の構成を示す説明図である。実
施例２では、図示の如く、サーミスタ１０５を定着ロー
ラ１０２の非画像部の１０２ａで示す部分に、サーモス
タット３０１を定着ローラ１０２の非画像部の１０２ｂ
で示す部分に接触するように各々配設され、３つのヒー
トパイプ１０３を備えている。また、図示の如く、ヒー
トパイプ１０３は画像部と非画像部にわたって配設され
ており、これにより実施例１の場合と同様に、画像部温
度を正確に検知でき、定着ローラ１０２が異常高温にな
ることがなく、安全性が向上できる。FIG. 3 is an explanatory view showing the structure of the non-image portion of the fixing roller 102 in the fixing device of the second embodiment. In the second embodiment, as shown in the drawing, the thermistor 105 is provided at a portion 102a of the non-image portion of the fixing roller 102, and the thermostat 301 is provided at the portion 102b of the non-image portion of the fixing roller 102.
Three heat pipes 103 are provided so as to be in contact with the portions indicated by. Further, as shown in the figure, the heat pipe 103 is arranged over the image portion and the non-image portion, and as a result, the temperature of the image portion can be accurately detected and the fixing roller 102 becomes an abnormally high temperature as in the case of the first embodiment. And the safety can be improved.
【００１６】実施例２では、図３に示すように、サーミ
スタ１０５，サーモスタット３０１を定着ローラ１０２
の軸方向に対して異なる位置に接触させている。これ
は、サーミスタ１０５，サーモスタット３０１が定着ロ
ーラ１０２表面に接触していると定着ローラ１０２表面
が磨耗し、サーミスタ１０５とサーモスタット３０１を
定着ローラ１０２の軸方向に対して同じ位置に接触させ
た場合、定着ローラ１０２表面の磨耗の状態により、例
えば、サーミスタ１０５が定着ローラ１０２に十分接触
せず、温度を正確に検知できなくなるのを防止するため
である。また、サーモスタット３０１は定着ローラ１０
２表面がある温度以上になると、ヒータ１０１への通電
を遮断するため、サーミスタ１０５，或いは，制御系の
故障等により定着ローラ１０２が異常高温になるのを防
止することができる。In the second embodiment, as shown in FIG. 3, the thermistor 105 and the thermostat 301 are connected to the fixing roller 102.
Are contacted at different positions in the axial direction. This is because when the thermistor 105 and the thermostat 301 are in contact with the surface of the fixing roller 102, the surface of the fixing roller 102 is worn and when the thermistor 105 and the thermostat 301 are brought into contact with each other at the same position in the axial direction of the fixing roller 102, This is to prevent the thermistor 105 from coming into insufficient contact with the fixing roller 102 due to the worn state of the surface of the fixing roller 102, and the temperature cannot be accurately detected. Further, the thermostat 301 is the fixing roller 10
2 When the temperature of the surface exceeds a certain temperature, the energization of the heater 101 is cut off, so that it is possible to prevent the fixing roller 102 from reaching an abnormally high temperature due to a failure of the thermistor 105 or the control system.
【００１７】[0017]
【発明の効果】以上より明らかなように本発明によれ
ば、ヒータを内設した定着ローラと、定着ローラに隣接
した加圧ローラとを有する定着装置において、定着ロー
ラの内部に定着ローラの記録紙が通紙する画像部と記録
紙が通紙しない非画像部にわたって配設されるヒートパ
イプと、非画像部に接触し、定着ローラの温度を検知す
る温度検知手段とを具備したため、温度検知部材による
定着ローラの画像部の磨耗をなくし、且つ、定着ローラ
の画像部の温度を正確に検知することができ、更に定着
ローラが異常高温になるのを確実に防止することができ
る。As is apparent from the above, according to the present invention, in a fixing device having a fixing roller having a heater therein and a pressure roller adjacent to the fixing roller, the recording of the fixing roller is performed inside the fixing roller. Since a heat pipe is provided over the image area where the paper passes and the non-image area where the recording paper does not pass, and the temperature detection means that contacts the non-image area and detects the temperature of the fixing roller, the temperature detection It is possible to eliminate the abrasion of the image portion of the fixing roller by the member, to accurately detect the temperature of the image portion of the fixing roller, and to reliably prevent the fixing roller from becoming an abnormally high temperature.
【００１８】また、以上より明らかなように本発明によ
れば、ヒータを内設した定着ローラと、定着ローラに隣
接した加圧ローラとを有する定着装置において、定着ロ
ーラの内部に定着ローラの記録紙が通紙する画像部と記
録紙が通紙しない非画像部にわたって配設されるヒート
パイプと、非画像部に接触する定着ローラの温度を検知
する温度検知手段，及び，定着ローラが所定の温度を越
えた場合にヒータへの通電を遮断させる温度調節手段と
を具備したため、温度検知部材による定着ローラの画像
部の磨耗をなくし、且つ、定着ローラの画像部の温度を
正確に検知することができ、更に定着ローラが異常高温
になるのを確実に防止することができる。As is apparent from the above, according to the present invention, in the fixing device having the fixing roller having the heater therein and the pressure roller adjacent to the fixing roller, the recording of the fixing roller is performed inside the fixing roller. A heat pipe arranged over the image portion where the paper passes and the non-image portion where the recording paper does not pass, a temperature detecting means for detecting the temperature of the fixing roller in contact with the non-image portion, and the fixing roller have a predetermined size. Equipped with temperature adjusting means for shutting off the power to the heater when the temperature is exceeded, it is possible to eliminate the abrasion of the image portion of the fixing roller by the temperature detecting member and to accurately detect the temperature of the image portion of the fixing roller. In addition, it is possible to reliably prevent the fixing roller from reaching an abnormally high temperature.
【図１】本発明の実施例１の定着装置の概略構成を示す
断面図である。FIG. 1 is a cross-sectional view illustrating a schematic configuration of a fixing device according to a first exemplary embodiment of the present invention.
【図２】本発明の実施例１の定着ローラ表面温度の軸方
向に対する温度勾配を示す説明図である。FIG. 2 is an explanatory diagram showing a temperature gradient in the axial direction of the fixing roller surface temperature according to the first embodiment of the present invention.
【図３】本発明の実施例２の定着ローラの非画像部にお
ける構成を示す説明図である。FIG. 3 is an explanatory diagram illustrating a configuration of a non-image portion of a fixing roller according to a second exemplary embodiment of the present invention.
１０１ ヒータ １０２ 定
着ローラ
１０２ａ サーミスタが接触する定着ローラの領域
１０２ｂ サーモスタットが接触する定着ローラの領域
１０３ ヒートパイプ １０５ サ
ーミスタ
３０１ サーモスタットReference Signs List 101 heater 102 fixing roller 102a fixing roller region 102b contacted by thermistor 102b fixing roller region 103 contacted by thermostat 103 heat pipe 105 thermistor 301 thermostat
───────────────────────────────────────────────────── フロントページの続き (72)発明者 佐藤 雅彦 東京都大田区中馬込１丁目３番６号 株式 会社リコー内 (72)発明者 檜ケ谷 敏明 東京都大田区中馬込１丁目３番６号 株式 会社リコー内 (72)発明者 岡本 潤 東京都大田区中馬込１丁目３番６号 株式 会社リコー内 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Masahiko Sato 1-3-3 Nakamagome, Ota-ku, Tokyo Stocks Company Ricoh (72) Inventor Toshiaki Higaya 1-3-3 Nakamagome, Ota-ku, Tokyo Stocks Company Ricoh (72) Inventor Jun Okamoto 1-3-3 Nakamagome, Ota-ku, Tokyo Stocks Company Ricoh
Claims (3)
着ローラに隣接した加圧ローラとを有する定着装置にお
いて、前記定着ローラの内部に前記定着ローラの記録紙
が通紙する画像部と記録紙が通紙しない非画像部にわた
って配設されるヒートパイプと、前記非画像部に接触
し、前記定着ローラの温度を検知する温度検知手段とを
具備したことを特徴とする定着装置。1. A fixing device having a fixing roller having a heater therein and a pressure roller adjacent to the fixing roller, wherein an image portion and a recording sheet through which the recording paper of the fixing roller passes inside the fixing roller. A fixing device comprising: a heat pipe arranged over a non-image portion where paper does not pass; and a temperature detecting unit that is in contact with the non-image portion and detects the temperature of the fixing roller.
着ローラに隣接した加圧ローラとを有する定着装置にお
いて、前記定着ローラの内部に前記定着ローラの記録紙
が通紙する画像部と記録紙が通紙しない非画像部にわた
って配設されるヒートパイプと、前記非画像部に接触す
る前記定着ローラの温度を検知する温度検知手段，及
び，前記定着ローラが所定の温度を越えた場合に前記ヒ
ータへの通電を遮断させる温度調節手段とを具備したこ
とを特徴とする定着装置。2. A fixing device having a fixing roller having a heater therein and a pressure roller adjacent to the fixing roller, wherein an image portion and a recording sheet through which the recording paper of the fixing roller passes inside the fixing roller. A heat pipe arranged over a non-image portion where paper does not pass, a temperature detecting means for detecting the temperature of the fixing roller in contact with the non-image portion, and a case where the fixing roller exceeds a predetermined temperature. A fixing device, comprising: a temperature control unit that cuts off power supply to the heater.
手段は、前記定着ローラの軸方向に対し、異なる位置に
接触させることを特徴とする請求項２の定着装置。3. The fixing device according to claim 2, wherein the temperature detecting means and the temperature adjusting means are brought into contact with different positions in the axial direction of the fixing roller.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03206448A JP3090983B2 (en) | 1991-07-23 | 1991-07-23 | Fixing device and fixing roller |
| US07/893,050 US5300996A (en) | 1991-06-07 | 1992-06-03 | Fixing apparatus |
| DE4218664A DE4218664C2 (en) | 1991-06-07 | 1992-06-05 | Fixing device for fixing an image on a recording sheet |
| DE4244905A DE4244905C2 (en) | 1991-06-07 | 1992-06-05 | Fixing unit for fixing image on recording sheet for image prodn. unit e.g. copier |
| US08/628,270 USRE36124E (en) | 1991-06-07 | 1996-04-05 | Fixing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03206448A JP3090983B2 (en) | 1991-07-23 | 1991-07-23 | Fixing device and fixing roller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0527648A true JPH0527648A (en) | 1993-02-05 |
| JP3090983B2 JP3090983B2 (en) | 2000-09-25 |
Family
ID=16523547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03206448A Expired - Fee Related JP3090983B2 (en) | 1991-06-07 | 1991-07-23 | Fixing device and fixing roller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3090983B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6268799B1 (en) | 1996-04-10 | 2001-07-31 | Seiko Epson Corporation | Light-source lamp unit, light-source device and projection-type display apparatus and method of use |
| US8112022B2 (en) | 2008-05-02 | 2012-02-07 | Ricoh Company, Ltd. | Fixing device, image forming apparatus, and image fixing method capable of stably applying oil for fixing without adhering oil to sheet |
| US8346143B2 (en) | 2008-05-01 | 2013-01-01 | Ricoh Company, Ltd. | Fixing device and image forming apparatus capable of effectively circulating and applying oil for fixing |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7480480B2 (en) | 2005-09-13 | 2009-01-20 | Canon Kabushiki Kaisha | Image heating apparatus with heat pipe for decreasing unevenness in temperature distribution |
| JP2009271246A (en) | 2008-05-02 | 2009-11-19 | Ricoh Co Ltd | Fixing device and image forming apparatus |
-
1991
- 1991-07-23 JP JP03206448A patent/JP3090983B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6268799B1 (en) | 1996-04-10 | 2001-07-31 | Seiko Epson Corporation | Light-source lamp unit, light-source device and projection-type display apparatus and method of use |
| US6690282B2 (en) | 1996-04-10 | 2004-02-10 | Seiko Epson Corporation | Light-source lamp unit, light-source device and projection-type display apparatus |
| US7006004B2 (en) | 1996-04-10 | 2006-02-28 | Seiko Epson Corporation | Light-source lamp unit, light-source device and projection-type display apparatus |
| US8346143B2 (en) | 2008-05-01 | 2013-01-01 | Ricoh Company, Ltd. | Fixing device and image forming apparatus capable of effectively circulating and applying oil for fixing |
| US8112022B2 (en) | 2008-05-02 | 2012-02-07 | Ricoh Company, Ltd. | Fixing device, image forming apparatus, and image fixing method capable of stably applying oil for fixing without adhering oil to sheet |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3090983B2 (en) | 2000-09-25 |
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