JP2001013805A - Fixing device - Google Patents
Fixing deviceInfo
- Publication number
- JP2001013805A JP2001013805A JP11181833A JP18183399A JP2001013805A JP 2001013805 A JP2001013805 A JP 2001013805A JP 11181833 A JP11181833 A JP 11181833A JP 18183399 A JP18183399 A JP 18183399A JP 2001013805 A JP2001013805 A JP 2001013805A
- Authority
- JP
- Japan
- Prior art keywords
- roller
- fixing
- fixing roller
- temperature
- induction heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Fixing For Electrophotography (AREA)
- General Induction Heating (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、複写機，プリン
タ，ファクシミリ等の画像形成装置に装着される定着装
置に関し、さらに詳しく言えば誘導加熱型の定着装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device mounted on an image forming apparatus such as a copying machine, a printer, and a facsimile, and more particularly, to an induction heating type fixing device.
【０００２】[0002]
【従来の技術】複写機，プリンタ，ファクシミリ等の画
像形成装置における定着装置として、未定着トナー像を
担持する用紙を加熱する定着ローラと、該加熱ローラに
圧設される加圧ローラとを有し、定着ローラと加圧ロー
ラとで用紙を挟持搬送して熱及び圧力により未定着トナ
ー像を用紙上に定着するヒートローラ方式の定着装置は
周知である。2. Description of the Related Art As a fixing device in an image forming apparatus such as a copying machine, a printer, a facsimile, etc., there are provided a fixing roller for heating a sheet carrying an unfixed toner image, and a pressure roller pressed against the heating roller. A fixing device of a heat roller type for fixing a non-fixed toner image on a sheet by heat and pressure by nipping and conveying the sheet between a fixing roller and a pressure roller is well known.
【０００３】従来、ヒートローラ方式の定着装置では、
定着ローラ内部に加熱ヒータとしてのハロゲンランプ等
を備え、このハロゲンランプで定着ローラを加熱するも
のが主流であった。Conventionally, in a fixing device of a heat roller type,
Most of the fixing rollers have a halogen lamp or the like as a heater and heat the fixing roller with the halogen lamp.
【０００４】しかし、このようなヒータによる加熱方式
は、定着ローラを必要な温度に加熱するまでの時間が長
く、また、ヒータ自体の損失も大きいため、環境問題が
注目される現在では、効率が良く、立ち上がり時間の早
い定着装置が要求されている。However, such a heating method using a heater takes a long time until the fixing roller is heated to a required temperature, and the loss of the heater itself is large. There is a demand for a fixing device with good rise time.
【０００５】このような状況にあって、誘導加熱方式の
定着装置は、定着ローラを電磁波による渦電流によって
瞬時に加熱することができるので、立ち上げ時間を画期
的に短くすることができる。そのため、誘導加熱方式の
定着装置は、従来のハロゲンランプ方式では必要であっ
た予熱（再使用時に定着部の温度を速やかに所定温度ま
で立ち上げるため、非画像形成時にも定着部の温度を維
持すること）の必要がなくなり、無駄な電力を不要とす
ることができ、かつ、加熱効率も優れているため、環境
問題にも有利な方式として注目されている。Under such circumstances, the induction heating type fixing device can instantly heat the fixing roller by the eddy current caused by the electromagnetic wave, so that the start-up time can be shortened remarkably. For this reason, the induction heating type fixing device requires the preheating that was required in the conventional halogen lamp method (the temperature of the fixing unit is maintained even during non-image formation because the temperature of the fixing unit quickly rises to a predetermined temperature when reused). Is unnecessary, unnecessary power is not required, and the heating efficiency is excellent.
【０００６】図５は、従来の誘導加熱方式の定着装置の
一例を示すものである。この図において、中空円筒状の
定着ローラ４１の内部には、ボビン４３に巻装された誘
導加熱用のコイル４２が配設されている。この定着ロー
ラ４１に圧接されて回転する中実（中空でない）の加圧
ローラ４は、芯金４ａの外側に弾性層４ｂが設けられて
いる。FIG. 5 shows an example of a conventional induction heating type fixing device. In this figure, an induction heating coil 42 wound around a bobbin 43 is disposed inside a hollow cylindrical fixing roller 41. The solid (non-hollow) pressure roller 4 which is rotated by being pressed against the fixing roller 41 is provided with an elastic layer 4b outside the cored bar 4a.
【０００７】図示しない誘導加熱回路であるインバータ
がコイル４２に流れる電流を変化させ、これにより定着
ローラ４１の芯金に渦電流が生じて定着ローラ４１の温
度が上昇する。[0007] An inverter, which is an induction heating circuit (not shown), changes the current flowing through the coil 42, thereby generating an eddy current in the metal core of the fixing roller 41 and increasing the temperature of the fixing roller 41.
【０００８】立ち上がり時間の早い誘導加熱方式の定着
装置であるが、さらに立ち上がり時間を短縮するため
に、定着ローラを薄肉化して熱容量を小さくすることが
特開平１０−３９６６５号公報において提案されてい
る。また、薄肉化に伴う定着ローラの強度低下を防ぐた
めに、加圧ローラをローラ両端部ではなく中央部側で加
圧することが特開平１０−１７１２８４号公報において
提案されている。なお、通常の定着ローラの肉厚は１ｍ
ｍ程度であり、それ以下の肉厚のものを薄肉定着ローラ
と呼んでいる。Japanese Patent Application Laid-Open No. Hei 10-39665 proposes an induction heating type fixing device having a fast rise time. In order to further reduce the rise time, the fixing roller is made thinner to reduce the heat capacity. . Japanese Patent Application Laid-Open No. Hei 10-171284 proposes that the pressure roller is pressed not at both ends but at the center thereof in order to prevent the strength of the fixing roller from being reduced due to the reduction in thickness. The thickness of a normal fixing roller is 1 m.
m, and those having a thickness less than that are called thin fixing rollers.
【０００９】[0009]
【発明が解決しようとする課題】しかしながら、薄肉の
定着ローラを使用した従来の定着装置では、薄肉化に伴
う定着ローラの強度低下を防ぐために定着ローラにリブ
を設けた場合、リブ部の熱容量が増えるため、その部分
だけ定着ローラの温度が低下し、温度ムラが生じるとい
う問題があった。However, in a conventional fixing device using a thin fixing roller, when the fixing roller is provided with a rib in order to prevent a decrease in the strength of the fixing roller due to the thinning, the heat capacity of the rib portion is reduced. Therefore, there is a problem that the temperature of the fixing roller decreases only in that portion, causing temperature unevenness.
【００１０】図６は、定着ローラにリブを設けた定着装
置の部分断面図および定着ローラ軸方向の温度ムラの様
子を示すグラフである。図５の従来例と同じ部分には同
じ符号を付して説明を省略する。図６に示す定着装置で
は、定着ローラ５１のローラ内側のＡ，Ｂ２箇所にリブ
５，５が設けてある。また、誘導加熱用のコイル５２
は、ローラ軸方向に均一に巻いてある。FIG. 6 is a partial sectional view of a fixing device having a fixing roller provided with ribs, and a graph showing a state of temperature unevenness in the fixing roller axial direction. The same parts as those in the conventional example of FIG. In the fixing device shown in FIG. 6, ribs 5 and 5 are provided at two positions A and B inside the fixing roller 51. Further, a coil 52 for induction heating is used.
Are uniformly wound in the roller axis direction.
【００１１】このような定着ローラ５１の表面温度の軸
方向の分布を図６（ｂ）のグラフに示す。このグラフか
ら分るように、リブ５，５がある個所で定着ローラの表
面温度が低下している。このグラフでは、わかりやすく
するために温度の変化を強調して描いてある。なお、ロ
ーラ両端部での温度低下は放熱によるものである。この
ように、リブがあることによりローラの熱容量が増え、
定着ローラの温度が低下して温度ムラが生じている。定
着ローラに温度ムラが生じると定着ムラの原因となり、
良好な画像を得ることができない。The axial distribution of the surface temperature of the fixing roller 51 is shown in the graph of FIG. As can be seen from this graph, the surface temperature of the fixing roller is lowered where the ribs 5 and 5 are located. In this graph, the temperature change is emphasized for clarity. The temperature drop at both ends of the roller is due to heat radiation. In this way, the presence of the ribs increases the heat capacity of the roller,
The temperature of the fixing roller has dropped, causing temperature unevenness. If the fixing roller has uneven temperature, it may cause uneven fixing.
A good image cannot be obtained.
【００１２】また、薄肉化に伴う定着ローラの強度低下
を防ぐために、加圧ローラをローラ両端部よりも中央側
で加圧する場合、加圧位置は通紙範囲内となり、その加
圧位置では定着ローラから加圧ローラ芯金及び軸受を通
して加圧軸に熱が伝わるため、その部分だけ定着ローラ
温度が低下して温度ムラが生じるという問題があった。Further, in order to prevent the strength of the fixing roller from being reduced due to the reduction in thickness, when the pressing roller is pressed at the center side from both ends of the roller, the pressing position is within the paper passing range. Since heat is transmitted from the roller to the pressure shaft through the pressure roller core and the bearing, there is a problem that the temperature of the fixing roller is lowered only at that portion and temperature unevenness occurs.
【００１３】図７は、加圧ローラを通紙範囲内で加圧す
る定着装置における温度ムラの様子を示すもので、定着
装置の部分断面図および温度分布グラフである。この図
に示す定着装置において、定着ローラ４１は図５に示す
ものと同一である。加圧ローラ１４は、加圧軸１５に軸
受１６を介して中空芯金１７が支持され、その芯金１７
の外側に弾性層１４ｂが設けられている。加圧軸１５を
図示しない加圧機構で加圧すると、軸受１６を通じて加
圧ローラ１４が定着ローラ４１に圧接される。FIG. 7 is a partial sectional view of the fixing device and a temperature distribution graph showing a state of temperature unevenness in the fixing device in which the pressure roller presses the sheet within the paper range. In the fixing device shown in this figure, the fixing roller 41 is the same as that shown in FIG. The pressure roller 14 has a hollow core 17 supported on a pressure shaft 15 via a bearing 16.
Is provided with an elastic layer 14b outside. When the pressing shaft 15 is pressed by a pressing mechanism (not shown), the pressing roller 14 is pressed against the fixing roller 41 through the bearing 16.
【００１４】図７に示す定着装置では、定着ローラ４１
から加圧ローラ１４の芯金１７及び軸受１６を通して加
圧軸１５に熱が伝わるため、軸受のある部分で定着ロー
ラ温度及び加圧ローラ温度が低下し、ローラ温度が不均
一となり定着ムラが生じる。In the fixing device shown in FIG.
From the pressure roller 14 to the pressure shaft 15 through the metal core 17 of the pressure roller 14 and the bearing 16, the temperature of the fixing roller and the temperature of the pressure roller are reduced in a certain portion of the bearing, and the roller temperature becomes non-uniform, causing uneven fixing. .
【００１５】本発明は、薄肉定着ローラを使用した従来
の誘導加熱型定着装置における上述の問題を解決し、ロ
ーラ軸方向の温度を均一にして定着ムラを生じることの
ない定着装置を提供することを課題とする。An object of the present invention is to solve the above-mentioned problem in a conventional induction heating type fixing device using a thin fixing roller, and to provide a fixing device in which the temperature in the roller axis direction is made uniform and no fixing unevenness occurs. As an issue.
【００１６】[0016]
【課題を解決するための手段】前記の課題は、本発明に
より、誘導加熱される定着ローラを備える定着装置にお
いて、前記定着ローラは補強用のリブを有し、該リブを
設けた位置に対応して誘導加熱用コイルの巻き数を変化
させることを提案する。According to the present invention, there is provided a fixing device having a fixing roller which is heated by induction, wherein the fixing roller has a reinforcing rib and corresponds to a position where the rib is provided. It is proposed to change the number of turns of the induction heating coil.
【００１７】また、前記の課題を解決するため、本発明
は、誘導加熱される定着ローラを備える定着装置におい
て、前記定着ローラに圧接される加圧ローラは通紙範囲
内に加圧位置を有し、該加圧ローラの加圧位置に対応し
て誘導加熱用コイルの巻き数を変化させることを提案す
る。According to another aspect of the present invention, there is provided a fixing device including a fixing roller that is induction-heated, wherein a pressing roller that is pressed against the fixing roller has a pressing position within a paper passing range. Then, it is proposed to change the number of turns of the induction heating coil in accordance with the pressure position of the pressure roller.
【００１８】また、前記の課題を解決するため、本発明
は、誘導加熱される定着ローラを備える定着装置におい
て、前記定着ローラは補強用のリブを有し、該定着ロー
ラに圧接される加圧ローラは通紙範囲内に加圧位置を有
し、前記リブを設けた位置及び加圧ローラの加圧位置に
対応して誘導加熱用コイルの巻き数を変化させることを
提案する。According to another aspect of the present invention, there is provided a fixing device having an induction-heated fixing roller, wherein the fixing roller has a reinforcing rib, and a pressure roller is pressed against the fixing roller. It is proposed that the roller has a pressing position in the paper passing range, and that the number of turns of the induction heating coil be changed in accordance with the position where the rib is provided and the pressing position of the pressing roller.
【００１９】また、前記の課題を解決するため、本発明
は、前記誘導加熱用コイルの巻き数の変化量が、定着ロ
ーラ温度が軸方向に均一となるように設定されることを
提案する。In order to solve the above-mentioned problem, the present invention proposes that the amount of change in the number of turns of the induction heating coil is set so that the temperature of the fixing roller is uniform in the axial direction.
【００２０】また、前記の課題を解決するため、本発明
は、前記誘導加熱用コイルと前記リブとが接触しないよ
う、前記リブの直近を避けて誘導加熱用コイルを巻装す
ることを提案する。Further, in order to solve the above-mentioned problem, the present invention proposes that the induction heating coil is wound around the rib so as not to be in close proximity to the rib so that the coil does not come into contact with the rib. .
【００２１】[0021]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。図１は、本発明に係る定着装置の
一例の主要部を示す部分断面図である。この図に示す定
着装置において、中空円筒状の定着ローラ１の内部に
は、ボビン３に巻装された誘導加熱用のコイル２が配設
されている。この定着ローラ１に圧接されて回転する中
実（中空でない）の加圧ローラ４は、例えばアルミニウ
ムや鉄などの金属でできた芯金４ａと、その外側の例え
ばシリコーンゴムによる弾性層４ｂとからなっている。
定着ローラ１と加圧ローラ４の表面には、トナーが固着
しないように、テフロン等の離型層（図示せず）を設け
てある。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial sectional view showing a main part of an example of a fixing device according to the present invention. In the fixing device shown in this figure, a coil 2 for induction heating wound around a bobbin 3 is disposed inside a hollow cylindrical fixing roller 1. The solid (non-hollow) pressure roller 4 which is rotated by being pressed against the fixing roller 1 is composed of a metal core 4a made of metal such as aluminum or iron, and an elastic layer 4b made of, for example, silicone rubber on the outside thereof. Has become.
A release layer (not shown) such as Teflon is provided on the surfaces of the fixing roller 1 and the pressure roller 4 so that the toner does not adhere.
【００２２】また、定着ローラ１に接触あるいは近接し
て図示しないサーミスタが設置されている。そのサーミ
スタとコイル２は、図示しない誘導加熱回路であるイン
バータに接続されている。インバータにより誘導加熱コ
イル２を高周波駆動することによって高周波磁界を発生
し、この磁界により、金属性の定着ローラ１に渦電流が
流れてローラ温度が上昇する。そして、定着ローラ１
は、サーミスタでその温度を検出され、転写材（転写紙
等）にトナーを定着するのに必要な温度になるようにイ
ンバータによって制御される。A thermistor (not shown) is provided in contact with or close to the fixing roller 1. The thermistor and the coil 2 are connected to an inverter, which is an induction heating circuit (not shown). The induction heating coil 2 is driven by the inverter at a high frequency to generate a high-frequency magnetic field, and this magnetic field causes an eddy current to flow through the metallic fixing roller 1 to increase the roller temperature. And the fixing roller 1
The temperature is detected by a thermistor, and is controlled by an inverter so that the temperature becomes necessary to fix the toner on the transfer material (transfer paper or the like).
【００２３】ところで、定着ローラ１は薄肉の定着ロー
ラであり、ローラ強度の低下を防ぐため図１（ａ）に示
すように、定着ローラ１の軸方向Ａ，Ｂの２箇所にリブ
５，５が設けてある。リブ５，５は定着ローラ１の周方
向に延設されている。そして、そのリブ５，５の位置に
対応してコイル２の巻き数を増やしている。すなわち、
リブ５，５が設けられている部分で誘導加熱コイル２の
巻装密度を大きくしている。コイル２の巻き数を増加さ
せると、その部分で発生する渦電流が他の部分に比べる
と増えるため発熱量も増加し、リブにより熱容量が増え
てもローラ温度が低下しなくなる。このため、本実施形
態では、定着ローラ１に補強用のリブ５，５が設けられ
ていてもローラ軸方向の温度分布が図１（ｂ）に示すよ
うに均一となり、温度ムラの発生を防ぐことができる。The fixing roller 1 is a thin fixing roller. As shown in FIG. 1A, ribs 5 and 5 are provided at two positions in the axial direction A and B of the fixing roller 1 in order to prevent a reduction in roller strength. Is provided. The ribs 5 and 5 extend in the circumferential direction of the fixing roller 1. The number of turns of the coil 2 is increased in accordance with the positions of the ribs 5 and 5. That is,
The winding density of the induction heating coil 2 is increased in the portion where the ribs 5 and 5 are provided. When the number of turns of the coil 2 is increased, the eddy current generated in that portion increases as compared with other portions, so that the amount of heat generated also increases, and even if the heat capacity increases due to the ribs, the roller temperature does not decrease. For this reason, in this embodiment, even if the fixing rollers 1 are provided with the reinforcing ribs 5 and 5, the temperature distribution in the roller axis direction becomes uniform as shown in FIG. be able to.
【００２４】なお、リブ５，５に対応する位置でコイル
２の巻き数を増加させる場合、その適切な増加量は、定
着ローラ１の材質，コイル２とローラ芯金とのギャッ
プ，コイル巻線の本数，コイルの太さ，リブの大きさ等
により変わるので、定着ローラ１の温度がローラ軸方向
にほぼ均一となるように設定するものとする。When the number of turns of the coil 2 is increased at positions corresponding to the ribs 5 and 5, the appropriate amount of increase is determined by the material of the fixing roller 1, the gap between the coil 2 and the roller core, the coil winding. , The thickness of the coil, the size of the ribs, etc., the temperature of the fixing roller 1 is set to be substantially uniform in the roller axis direction.
【００２５】また、安全のため、定着ローラのリブ５，
５とコイル２が接触しないように、リブの直近を避けて
コイルを巻くのが好ましい。本実施形態でも、図１
（ａ）に示すように、リブ５，５の真下を避け、その両
側所定範囲でコイル２の巻き数を増加させている。For the sake of safety, the fixing roller ribs 5
Preferably, the coil is wound around the ribs so as to avoid contact between 5 and the coil 2. Also in this embodiment, FIG.
As shown in (a), the number of turns of the coil 2 is increased in a predetermined range on both sides of the ribs 5 and 5 while avoiding the area directly below them.
【００２６】このように、本実施形態では、補強リブを
設けた薄肉定着ローラ１の部分的な温度低下による温度
ムラを防ぐために、リブ位置に対応して誘導加熱用コイ
ル２の巻き数を増加させているので、その部分での発熱
量が増加しローラ温度が低下しなくなる。よって、ロー
ラ軸方向の温度分布が均一となり、定着ローラ１の温度
ムラを原因とする定着ムラの発生を防ぎ、良好な定着を
行うことができる。As described above, in this embodiment, the number of turns of the induction heating coil 2 is increased corresponding to the rib position in order to prevent temperature unevenness due to a partial temperature drop of the thin fixing roller 1 provided with the reinforcing rib. As a result, the amount of heat generated at that portion increases, and the roller temperature does not decrease. Therefore, the temperature distribution in the roller axis direction becomes uniform, and the occurrence of fixing unevenness due to the temperature unevenness of the fixing roller 1 can be prevented, and satisfactory fixing can be performed.
【００２７】次に、本発明の第２の実施形態について説
明する。図２に示す本実施形態の定着装置において、定
着ローラ１１に加圧ローラ１４が圧接されている。中空
円筒状の定着ローラ１１の内部には、ボビン１３に巻装
された誘導加熱用のコイル１２が配設されている。加圧
ローラ１４は、加圧軸１５に軸受１６を介して中空芯金
１７が支持され、その芯金１７の外側に弾性層１４ｂが
設けられている。弾性層１４ｂは例えばシリコーンゴム
とすることができる。そして、加圧軸１５を図示しない
加圧機構で加圧すると、軸受１６を通じて加圧ローラ１
４が定着ローラ１１に圧接される。軸受１６の位置、す
なわち加圧ローラ１４の加圧位置は通紙範囲内となって
いる。Next, a second embodiment of the present invention will be described. In the fixing device of the present embodiment illustrated in FIG. 2, a pressure roller 14 is pressed against the fixing roller 11. Inside the hollow cylindrical fixing roller 11, a coil 12 for induction heating wound around a bobbin 13 is provided. The pressure roller 14 has a hollow core 17 supported on a pressure shaft 15 via a bearing 16, and an elastic layer 14 b is provided outside the core 17. The elastic layer 14b can be made of, for example, silicone rubber. When the pressing shaft 15 is pressed by a pressing mechanism (not shown), the pressing roller 1
4 is pressed against the fixing roller 11. The position of the bearing 16, that is, the pressing position of the pressing roller 14 is within the paper passing range.
【００２８】本実施形態では、加圧ローラ１４を介した
軸受１６及び加圧軸１５への熱の逃げによる定着ローラ
１１及び加圧ローラ１４の温度ムラを防ぐため、加圧ロ
ーラの軸受が設けられている位置Ｘ，Ｙに対応してコイ
ル１２の巻き数を増やしている。すなわち、軸受１６，
１６が設けられている部分で誘導加熱コイル１２の巻装
密度を大きくしている。これにより、その部分で発生す
る渦電流が他の部分に比べると増えるため発熱量も増加
し、ローラ温度の低下を防ぐことができるので温度ムラ
を防ぐことができる。したがって、定着ローラ１１の軸
方向の温度分布は図１（ｂ）のグラフと同様に均一とな
り、定着ムラを起こすことがない。In this embodiment, a pressure roller bearing is provided in order to prevent temperature unevenness of the fixing roller 11 and the pressure roller 14 due to heat escaping to the bearing 16 and the pressure shaft 15 via the pressure roller 14. The number of turns of the coil 12 is increased corresponding to the positions X and Y set. That is, the bearing 16,
The winding density of the induction heating coil 12 is increased in the portion where the reference numeral 16 is provided. As a result, the eddy current generated in that portion increases as compared with the other portions, so that the amount of heat generation also increases, and a decrease in the roller temperature can be prevented, so that temperature unevenness can be prevented. Therefore, the temperature distribution in the axial direction of the fixing roller 11 becomes uniform as in the graph of FIG. 1B, and the fixing unevenness does not occur.
【００２９】なお、軸受１６，１６に対応する位置でコ
イル１２の巻き数を増加させる場合、その適切な増加量
は、定着ローラ１１の材質，コイル１２とローラ芯金と
のギャップ，コイル巻線の本数，コイルの太さ，加圧ロ
ーラの材質等によって変わるので、定着ローラ１１の温
度がローラ軸方向にほぼ均一となるように設定するもの
とする。When the number of turns of the coil 12 is increased at a position corresponding to the bearings 16, 16, the appropriate amount of increase is determined by the material of the fixing roller 11, the gap between the coil 12 and the roller core, the coil winding. , The thickness of the coil, the material of the pressure roller, etc., the temperature of the fixing roller 11 is set to be substantially uniform in the roller axis direction.
【００３０】このように、本実施形態では、加圧ローラ
を通紙範囲内で加圧する定着装置における加圧ローラ軸
受部分での温度低下による温度ムラを防ぐために、加圧
ローラ軸受位置（加圧位置）に対応して誘導加熱用コイ
ル２の巻き数を増加させているので、その部分での発熱
量が増加しローラ温度が低下しなくなる。よって、ロー
ラ軸方向の温度分布が均一となり、定着ローラ１１の温
度ムラを原因とする定着ムラの発生を防ぎ、良好な定着
を行うことができる。As described above, in the present embodiment, in order to prevent temperature unevenness due to a temperature drop in the pressure roller bearing portion of the fixing device that presses the pressure roller within the paper passing range, the pressure roller bearing position (pressure Position), the number of turns of the induction heating coil 2 is increased, so that the amount of heat generated at that portion increases and the roller temperature does not decrease. Accordingly, the temperature distribution in the roller axis direction becomes uniform, and the occurrence of fixing unevenness due to the temperature unevenness of the fixing roller 11 can be prevented, and excellent fixing can be performed.
【００３１】次に、本発明の第３の実施形態について説
明する。図３に示す本実施形態の定着装置において、定
着ローラ２１に加圧ローラ１４が圧接されている。中空
円筒状の定着ローラ２１の内部には、ボビン２３に巻装
された誘導加熱用のコイル２２が配設されている。薄肉
の定着ローラの強度低下を防ぐため、Ａ，Ｂ２箇所にリ
ブ５，５が設けてある。加圧ローラ１４は、図２に示す
ものと同様であり、本実施形態では、定着ローラ２１の
リブ５，５を設けた位置Ａ，Ｂと同じ位置に加圧ローラ
１４の軸受１６，１６が設けてある。定着ローラに補強
用のリブを設け、加圧ローラをローラ両端部よりも中央
側で加圧することにより、さらなる定着ローラの薄肉化
を図っている。Next, a third embodiment of the present invention will be described. In the fixing device of the present embodiment shown in FIG. 3, the pressure roller 14 is pressed against the fixing roller 21. Inside the hollow cylindrical fixing roller 21, a coil 22 for induction heating wound around a bobbin 23 is provided. Ribs 5 and 5 are provided at two locations A and B in order to prevent the strength of the thin fixing roller from being reduced. The pressure roller 14 is the same as that shown in FIG. 2. In this embodiment, the bearings 16, 16 of the pressure roller 14 are located at the same positions as the positions A, B where the ribs 5, 5 of the fixing roller 21 are provided. It is provided. The fixing roller is provided with a reinforcing rib, and the pressure roller is pressed at the center side of both ends of the roller, thereby further reducing the thickness of the fixing roller.
【００３２】本実施形態の定着装置では、Ａ，Ｂ両位置
での温度低下を防ぐために、Ａ，Ｂ両位置に対応してコ
イル２２の巻き数を増やしている。すなわち、リブ５，
５を設け、軸受１６，１６を配置した部分で誘導加熱コ
イル２２の巻装密度を大きくしている。これにより、そ
の部分で発生する渦電流が他の部分に比べると増えるた
め発熱量も増加し、ローラ温度の低下を防ぐことができ
るので温度ムラを防ぐことができる。したがって、定着
ローラ２１の軸方向の温度分布は図１（ｂ）のグラフと
同様に均一となり、定着ムラを起こすことがない。In the fixing device of this embodiment, the number of turns of the coil 22 is increased corresponding to both the A and B positions in order to prevent the temperature from decreasing at both the A and B positions. That is, rib 5,
5, the winding density of the induction heating coil 22 is increased in the portion where the bearings 16 and 16 are arranged. As a result, the eddy current generated in that portion increases as compared with the other portions, so that the amount of heat generation also increases, and a decrease in the roller temperature can be prevented, so that temperature unevenness can be prevented. Therefore, the temperature distribution in the axial direction of the fixing roller 21 becomes uniform as in the graph of FIG. 1B, and the fixing unevenness does not occur.
【００３３】定着ローラ２１にリブ５，５が設けられて
いることと、通紙範囲内に加圧ローラ１４の軸受１６，
１６が設けられていることにより、Ａ，Ｂ両位置での温
度低下が大きくなることが考えられる。よって、コイル
２２の巻き数は、定着ローラ１にリブだけを設けた図１
の実施形態、及び、加圧ローラ１４の軸受だけを中央寄
りにした（定着ローラにリブが設けられていない）図２
の実施形態の場合よりも、巻き数をより多くすることが
妥当である。The fixing roller 21 is provided with the ribs 5 and 5, and the bearings 16 and
It is conceivable that the temperature drop at both the A and B positions becomes large due to the provision of 16. Therefore, the number of turns of the coil 22 is the same as that of FIG.
FIG. 2 in which only the bearing of the pressure roller 14 is located near the center (the fixing roller is not provided with a rib)
It is appropriate to increase the number of turns as compared with the case of the embodiment.
【００３４】ただし、リブ位置及び軸受位置でのコイル
２２の巻き数を増加させる場合、その適切な増加量は、
定着ローラ２１の材質，コイル２２とローラ芯金とのギ
ャップ，コイル巻線の本数，コイルの太さ，リブの大き
さ，加圧ローラの材質等によって変わるので、定着ロー
ラ２１の温度がローラ軸方向にほぼ均一となるように設
定するものとする。However, when increasing the number of turns of the coil 22 at the rib position and the bearing position, the appropriate increase amount is as follows.
The temperature of the fixing roller 21 varies depending on the material of the fixing roller 21, the gap between the coil 22 and the roller core, the number of coil windings, the thickness of the coil, the size of the rib, the material of the pressure roller, and the like. The direction is set to be substantially uniform.
【００３５】このように、本実施形態では、定着ローラ
に補強用のリブを設けると共に加圧ローラを通紙範囲内
で加圧する定着装置におけるリブ及び加圧ローラ軸受部
分での温度低下による温度ムラを防ぐために、リブ位置
及び加圧位置に対応して誘導加熱用コイル２２の巻き数
を増加させているので、その部分での発熱量が増加しロ
ーラ温度が低下しなくなる。よって、ローラ軸方向の温
度分布が均一となり、定着ローラ２１の温度ムラを原因
とする定着ムラの発生を防ぎ、良好な定着を行うことが
できる。As described above, in this embodiment, the fixing roller is provided with the reinforcing ribs, and the temperature unevenness due to the temperature drop at the ribs and the pressure roller bearing portion in the fixing device in which the pressure roller is pressed within the range of the paper passage. In order to prevent this, the number of turns of the induction heating coil 22 is increased corresponding to the rib position and the pressing position, so that the amount of heat generated at that portion is increased and the roller temperature does not decrease. Accordingly, the temperature distribution in the roller axis direction becomes uniform, and the occurrence of fixing unevenness due to the temperature unevenness of the fixing roller 21 can be prevented, and satisfactory fixing can be performed.
【００３６】次に、本発明の第４の実施形態について説
明する。図４に示す本実施形態の定着装置において、定
着ローラ３１に加圧ローラ１４が圧接されている。中空
円筒状の定着ローラ３１の内部には、ボビン３３に巻装
された誘導加熱用のコイル３２が配設されている。薄肉
の定着ローラの強度低下を防ぐため、軸方向Ｐの位置に
リブ５が設けてある。加圧ローラ１４は、図２に示すも
のと同様であり、本実施形態では、ローラ軸方向の位置
Ｑ，Ｒに加圧ローラ１４の軸受１６，１６が設けてあ
る。定着ローラに補強用のリブを設け、加圧ローラをロ
ーラ両端部よりも中央側で加圧することにより、さらな
る定着ローラの薄肉化を図っている。Next, a fourth embodiment of the present invention will be described. In the fixing device of the present embodiment shown in FIG. 4, the pressure roller 14 is pressed against the fixing roller 31. An induction heating coil 32 wound around a bobbin 33 is disposed inside the hollow cylindrical fixing roller 31. In order to prevent the strength of the thin fixing roller from decreasing, a rib 5 is provided at a position in the axial direction P. The pressure roller 14 is the same as that shown in FIG. 2, and in this embodiment, bearings 16, 16 of the pressure roller 14 are provided at positions Q, R in the roller axis direction. The fixing roller is provided with a reinforcing rib, and the pressure roller is pressed at the center side of both ends of the roller, thereby further reducing the thickness of the fixing roller.
【００３７】本実施形態の定着装置では、定着ローラの
リブを設けた位置Ｐ及び加圧ローラ軸受の位置Ｑ，Ｒの
各位置での温度低下を防ぐために、各位置（Ｐ，Ｑ，
Ｒ）に対応してコイル３２の巻き数を増やしている。す
なわち、リブ５を設けた部分と、軸受１６，１６を配置
した部分で誘導加熱コイル３２の巻装密度を大きくして
いる。これにより、その部分で発生する渦電流が他の部
分に比べると増えるため発熱量も増加し、ローラ温度の
低下を防ぐことができるので温度ムラを防ぐことができ
る。したがって、定着ローラ３１の軸方向の温度分布は
図１（ｂ）のグラフと同様に均一となり、定着ムラを起
こすことがない。In the fixing device of this embodiment, in order to prevent the temperature from being lowered at the position P where the rib of the fixing roller is provided and the positions Q and R of the pressure roller bearing, each position (P, Q,
R), the number of turns of the coil 32 is increased. That is, the winding density of the induction heating coil 32 is increased at the portion where the rib 5 is provided and at the portion where the bearings 16 and 16 are arranged. As a result, the eddy current generated in that portion increases as compared with the other portions, so that the amount of heat generation also increases, and a decrease in the roller temperature can be prevented, so that temperature unevenness can be prevented. Therefore, the temperature distribution in the axial direction of the fixing roller 31 becomes uniform as in the graph of FIG. 1B, and the fixing unevenness does not occur.
【００３８】なお、リブ位置及び軸受位置でのコイル３
２の巻き数を増加させる場合、その適切な増加量は、定
着ローラ３１の材質，コイル３２とローラ芯金とのギャ
ップ，コイル巻線の本数，コイルの太さ，リブの大き
さ，加圧ローラの材質等によって変わるので、定着ロー
ラ３１の温度がローラ軸方向にほぼ均一となるように設
定するものとする。The coil 3 at the rib position and the bearing position
When increasing the number of turns of No. 2, the appropriate amount of increase is determined by the material of the fixing roller 31, the gap between the coil 32 and the roller core, the number of coil windings, the thickness of the coil, the size of the rib, and the pressure. Since the temperature varies depending on the material of the roller and the like, the temperature of the fixing roller 31 is set to be substantially uniform in the roller axis direction.
【００３９】また、安全のため、定着ローラのリブ５と
コイル３２が接触しないように、リブの直近を避けてコ
イルを巻くのが好ましい。本実施形態でも、図４に示す
ように、リブ５の真下を避け、その両側所定範囲でコイ
ル３２の巻き数を増加させている。For safety, it is preferable that the coil be wound around the rib 5 of the fixing roller so as not to come into contact with the coil 32 so as not to come into contact with the rib. Also in the present embodiment, as shown in FIG. 4, the number of turns of the coil 32 is increased within a predetermined range on both sides of the rib 5, avoiding immediately below the rib 5.
【００４０】このように、本実施形態では、定着ローラ
に補強のリブを設けた位置と加圧ローラの軸受の位置が
異なる場合でも、夫々に対応する位置で誘導加熱用コイ
ル３２の巻き数を増加させているので、その部分での発
熱量が増加しローラ温度が低下しなくなる。よって、ロ
ーラ軸方向の温度分布が均一となり、定着ローラ３１の
温度ムラを原因とする定着ムラの発生を防ぎ、良好な定
着を行うことができる。As described above, in this embodiment, even when the position where the reinforcing rib is provided on the fixing roller and the position of the bearing of the pressure roller are different, the number of turns of the induction heating coil 32 is changed at the corresponding position. Since it is increased, the amount of heat generated in that portion increases, and the roller temperature does not decrease. Accordingly, the temperature distribution in the roller axis direction becomes uniform, and the occurrence of fixing unevenness due to the temperature unevenness of the fixing roller 31 can be prevented, and excellent fixing can be performed.
【００４１】以上、本発明を上記各実施形態により説明
したが、本発明は上記各実施形態に限定されるものでは
ない。例えば、定着ローラの補強用リブが３箇所以上に
設けられていた場合でも、各リブ位置に対応して誘導加
熱用コイルの巻き数を増加させれば良い。また、リブの
形状は、各実施形態における三角形断面に限らず、四角
形断面などどのような形状でも構わない。さらに、加圧
ローラの軸受の位置や個数も上記各実施形態に限定され
るものではない。もちろん、加圧ローラの弾性層の材質
などは任意に設定できるものである。Although the present invention has been described with reference to the above embodiments, the present invention is not limited to the above embodiments. For example, even when three or more reinforcing ribs of the fixing roller are provided, the number of turns of the induction heating coil may be increased corresponding to each rib position. The shape of the rib is not limited to the triangular cross section in each embodiment, and may be any shape such as a square cross section. Further, the position and number of the bearings of the pressure roller are not limited to the above embodiments. Of course, the material of the elastic layer of the pressure roller can be arbitrarily set.
【００４２】[0042]
【発明の効果】以上説明したように、本発明の定着装置
によれば、定着ローラの補強用リブを設けた位置に対応
して誘導加熱用コイルの巻き数を変化させるので、リブ
部分での発熱量を増加させてローラ温度の低下を防ぐこ
とが可能となる。よって、定着ローラの温度ムラを原因
とする定着ムラの発生を防ぎ、良好な定着を行うことが
できる。As described above, according to the fixing device of the present invention, the number of turns of the induction heating coil is changed in accordance with the position where the reinforcing rib of the fixing roller is provided. It is possible to prevent the roller temperature from lowering by increasing the heat generation amount. Accordingly, it is possible to prevent the occurrence of the fixing unevenness caused by the uneven temperature of the fixing roller, and to perform the excellent fixing.
【００４３】請求項２の構成により、通紙範囲内に加圧
位置を有する加圧ローラの加圧位置に対応して誘導加熱
用コイルの巻き数を変化させるので、加圧位置での発熱
量を増加さえてローラ温度の低下を防ぐことが可能とな
る。よって、温度ムラを原因とする定着ムラの発生を防
ぎ、良好な定着を行うことができる。According to the second aspect of the present invention, the number of turns of the induction heating coil is changed in accordance with the pressing position of the pressing roller having the pressing position within the paper passing range. Can be prevented from lowering the roller temperature. Therefore, it is possible to prevent the occurrence of the fixing unevenness caused by the temperature unevenness, and to perform the excellent fixing.
【００４４】請求項３の構成により、定着ローラの補強
用リブを設けた位置及び加圧ローラの加圧位置に対応し
て誘導加熱用コイルの巻き数を変化させるので、リブ位
置及び加圧位置での発熱量を増加さえてローラ温度の低
下を防ぐことが可能となる。よって、温度ムラを原因と
する定着ムラの発生を防ぎ、良好な定着を行うことがで
きる。According to the third aspect of the present invention, the number of turns of the induction heating coil is changed in accordance with the position where the reinforcing rib of the fixing roller is provided and the pressing position of the pressing roller. Thus, it is possible to prevent a decrease in the roller temperature by increasing the amount of heat generated at the roller. Therefore, it is possible to prevent the occurrence of the fixing unevenness caused by the temperature unevenness, and to perform the excellent fixing.
【００４５】請求項４の構成により、誘導加熱用コイル
の巻き数の変化量が、定着ローラ温度が軸方向に均一と
なるように設定されるので、ローラ軸方向の温度分布が
均一となり、定着ムラの発生がない良好な定着を行うこ
とができる。According to the fourth aspect of the present invention, the amount of change in the number of turns of the induction heating coil is set so that the temperature of the fixing roller becomes uniform in the axial direction. Good fixing without unevenness can be performed.
【００４６】請求項５の構成により、誘導加熱用コイル
と補強用リブとが接触しないよう、リブの直近を避けて
誘導加熱用コイルを巻装することにより、コイル被覆の
破損やコイルの切断等を防ぐことができる。According to the fifth aspect of the present invention, the coil for induction heating is wound around the induction heating coil so as not to contact the rib for reinforcement so that the coil for induction heating does not come into contact with the reinforcing rib. Can be prevented.
【図１】本発明に係る定着装置の一例の主要部を示す部
分断面図及びグラフである。FIG. 1 is a partial sectional view and a graph showing a main part of an example of a fixing device according to the present invention.
【図２】本発明の第２の実施形態の定着装置主要部を示
す部分断面図である。FIG. 2 is a partial cross-sectional view illustrating a main part of a fixing device according to a second exemplary embodiment of the present invention.
【図３】本発明の第３の実施形態の定着装置主要部を示
す部分断面図である。FIG. 3 is a partial cross-sectional view illustrating a main part of a fixing device according to a third embodiment of the present invention.
【図４】本発明の第４の実施形態の定着装置主要部を示
す部分断面図である。FIG. 4 is a partial sectional view showing a main part of a fixing device according to a fourth embodiment of the present invention.
【図５】従来の誘導加熱方式の定着装置の一例を示す部
分断面図である。FIG. 5 is a partial sectional view showing an example of a conventional induction heating type fixing device.
【図６】従来の定着装置における温度ムラの様子を示す
部分断面図及びグラフである。FIG. 6 is a partial sectional view and a graph showing a state of temperature unevenness in a conventional fixing device.
【図７】加圧ローラをローラ両端部よりも中央側で加圧
する定着装置の部分断面図及び温度分布グラフである。FIG. 7 is a partial cross-sectional view and a temperature distribution graph of a fixing device that presses the pressing roller at a center side of both ends of the roller.
１，１１，２１，３１，４１，５１ 定着ローラ ２，１２，２２，３２，４２，５２ 誘導加熱用コイル ３，１３，２３，３３，４３，５３ ボビン ４，１４ 加圧ローラ ５ リブ １５ 加圧軸 １６ 軸受 １７ 加圧ローラ芯金 1,11,21,31,41,51 Fixing roller 2,12,22,32,42,52 Induction heating coil 3,13,23,33,43,53 Bobbin 4,14 Pressure roller 5 Rib 15 Pressure shaft 16 Bearing 17 Pressure roller core
Claims (5)
装置において、前記定着ローラは補強用のリブを有し、
該リブを設けた位置に対応して誘導加熱用コイルの巻き
数を変化させることを特徴とする定着装置。1. A fixing device having a fixing roller that is induction-heated, wherein the fixing roller has a reinforcing rib,
A fixing device, wherein the number of turns of the induction heating coil is changed in accordance with the position where the rib is provided.
装置において、前記定着ローラに圧接される加圧ローラ
は通紙範囲内に加圧位置を有し、該加圧ローラの加圧位
置に対応して誘導加熱用コイルの巻き数を変化させるこ
とを特徴とする定着装置。2. A fixing device having a fixing roller which is induction-heated, wherein a pressing roller pressed against the fixing roller has a pressing position within a paper passing range, and corresponds to a pressing position of the pressing roller. Wherein the number of turns of the induction heating coil is changed.
装置において、前記定着ローラは補強用のリブを有し、
該定着ローラに圧接される加圧ローラは通紙範囲内に加
圧位置を有し、前記リブを設けた位置及び加圧ローラの
加圧位置に対応して誘導加熱用コイルの巻き数を変化さ
せることを特徴とする定着装置。3. A fixing device having a fixing roller that is induction-heated, wherein the fixing roller has a reinforcing rib,
The pressure roller pressed against the fixing roller has a pressure position within the paper passing range, and the number of turns of the induction heating coil changes according to the position where the rib is provided and the pressure position of the pressure roller. A fixing device.
が、定着ローラ温度が軸方向に均一となるように設定さ
れることを特徴とする、請求項１〜３に記載の定着装
置。4. The fixing device according to claim 1, wherein the amount of change in the number of turns of the induction heating coil is set so that the temperature of the fixing roller is uniform in the axial direction.
触しないよう、前記リブの直近を避けて誘導加熱用コイ
ルを巻装することを特徴とする、請求項１又は３に記載
の定着装置。5. The fixing device according to claim 1, wherein the induction heating coil is wound around the rib so as not to be close to the rib so that the induction heating coil does not contact the rib. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11181833A JP2001013805A (en) | 1999-06-28 | 1999-06-28 | Fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11181833A JP2001013805A (en) | 1999-06-28 | 1999-06-28 | Fixing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001013805A true JP2001013805A (en) | 2001-01-19 |
Family
ID=16107625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11181833A Pending JP2001013805A (en) | 1999-06-28 | 1999-06-28 | Fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001013805A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7480478B2 (en) | 2004-06-28 | 2009-01-20 | Ricoh Company, Ltd. | Method and apparatus for image forming capable of effectively fixing a toner image on a recording sheet by using induction heating |
| US7491917B2 (en) | 2005-06-23 | 2009-02-17 | Ricoh Company, Ltd. | Fuser and image forming device |
| US7539450B2 (en) | 2005-12-19 | 2009-05-26 | Ricoh Company, Ltd. | Image fixing apparatus and image forming apparatus that maintains high efficiency in heat generation and reduces loss in power consumption |
| US7783240B2 (en) | 2007-03-07 | 2010-08-24 | Ricoh Company, Ltd. | Fixing device, image forming apparatus including the fixing device, and fixing method |
| US7796933B2 (en) | 2007-03-23 | 2010-09-14 | Ricoh Company, Ltd. | Fixing device using electromagnetic induction heating and image forming apparatus including same |
| US7801457B2 (en) | 2007-03-12 | 2010-09-21 | Ricoh Company, Ltd. | Fixing device, image forming apparatus including the fixing device, and fixing method |
| US8014711B2 (en) | 2006-07-31 | 2011-09-06 | Ricoh Company, Ltd. | Fixing unit having enhanced temperature control and image forming apparatus using the same |
| US8190060B2 (en) | 2007-09-12 | 2012-05-29 | Ricoh Company, Ltd. | Fixing device, image forming apparatus, and method of manufacturing toner for image forming apparatus |
| US8406648B2 (en) | 2009-10-26 | 2013-03-26 | Ricoh Company, Ltd. | Heating device, fixing device, and image forming apparatus |
| US8761626B2 (en) | 2011-02-15 | 2014-06-24 | Ricoh Company, Ltd. | Fixing apparatus and image forming apparatus |
-
1999
- 1999-06-28 JP JP11181833A patent/JP2001013805A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7480478B2 (en) | 2004-06-28 | 2009-01-20 | Ricoh Company, Ltd. | Method and apparatus for image forming capable of effectively fixing a toner image on a recording sheet by using induction heating |
| US7491917B2 (en) | 2005-06-23 | 2009-02-17 | Ricoh Company, Ltd. | Fuser and image forming device |
| US7539450B2 (en) | 2005-12-19 | 2009-05-26 | Ricoh Company, Ltd. | Image fixing apparatus and image forming apparatus that maintains high efficiency in heat generation and reduces loss in power consumption |
| US8014711B2 (en) | 2006-07-31 | 2011-09-06 | Ricoh Company, Ltd. | Fixing unit having enhanced temperature control and image forming apparatus using the same |
| US7783240B2 (en) | 2007-03-07 | 2010-08-24 | Ricoh Company, Ltd. | Fixing device, image forming apparatus including the fixing device, and fixing method |
| US7801457B2 (en) | 2007-03-12 | 2010-09-21 | Ricoh Company, Ltd. | Fixing device, image forming apparatus including the fixing device, and fixing method |
| US7796933B2 (en) | 2007-03-23 | 2010-09-14 | Ricoh Company, Ltd. | Fixing device using electromagnetic induction heating and image forming apparatus including same |
| US8190060B2 (en) | 2007-09-12 | 2012-05-29 | Ricoh Company, Ltd. | Fixing device, image forming apparatus, and method of manufacturing toner for image forming apparatus |
| US8406648B2 (en) | 2009-10-26 | 2013-03-26 | Ricoh Company, Ltd. | Heating device, fixing device, and image forming apparatus |
| US8761626B2 (en) | 2011-02-15 | 2014-06-24 | Ricoh Company, Ltd. | Fixing apparatus and image forming apparatus |
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