JPH05127565A - Fixing device for image forming apparatus - Google Patents
Fixing device for image forming apparatusInfo
- Publication number
- JPH05127565A JPH05127565A JP28876991A JP28876991A JPH05127565A JP H05127565 A JPH05127565 A JP H05127565A JP 28876991 A JP28876991 A JP 28876991A JP 28876991 A JP28876991 A JP 28876991A JP H05127565 A JPH05127565 A JP H05127565A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- fixing roller
- fixing
- surface temperature
- forming apparatus
- 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)
- Control Of Temperature (AREA)
Abstract
(57)【要約】
【目的】ウォームアップ時間を増やすことなく定着ロー
ラ表面温度の落ち込みを軽減し、十分な定着性を得る。
【構成】定着ローラ１の表面温度Ｔｄをウォーミングア
ップが終了後、一定時間を設定温度Ｔｏよりも高温の高
温設定温度Ｔｕに設定する構成に加えて、ウォームアッ
プ開始時の定着ローラ１の表面温度Ｔｄを第１サーミス
タ８で検出し、検出値に基づいて、高温設定温度Ｔｕの
高さおよび高温設定温度Ｔｕとする時間の長さの少なく
とも一方を変更するように制御する。
(57) [Abstract] [Purpose] To reduce the drop in the surface temperature of the fixing roller without increasing the warm-up time and obtain sufficient fixing properties. [Structure] In addition to the configuration in which the surface temperature Td of the fixing roller 1 is set to a high temperature set temperature Tu higher than the set temperature To after warming up, the surface temperature Td of the fixing roller 1 at the start of warm-up is added. Is detected by the first thermistor 8, and based on the detected value, at least one of the height of the high temperature set temperature Tu and the length of time to reach the high temperature set temperature Tu is controlled.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、加熱手段により加熱さ
れ、表面温度が予め設定された設定温度に制御される定
着ローラと、該定着ローラに圧接される加圧ローラと、
前記定着ローラの表面温度を検知する表面温度検知手段
とを有し、前記定着ローラと加圧ローラにより未定着ト
ナー像を担持した転写材を挟持搬送し、その際未定着ト
ナー像を転写材に定着するようにした複写機、プリン
タ、ファクシミリ等における画像形成装置の定着装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing roller which is heated by heating means and whose surface temperature is controlled to a preset temperature, and a pressure roller which is brought into pressure contact with the fixing roller.
A surface temperature detecting unit that detects the surface temperature of the fixing roller, and nips and conveys the transfer material carrying the unfixed toner image by the fixing roller and the pressure roller, at which time the unfixed toner image is used as the transfer material. The present invention relates to a fixing device for an image forming apparatus in a copying machine, a printer, a facsimile, etc., which is fixed.
【０００２】[0002]
【従来の技術】上記形式の定着装置は、周知である。こ
の種の従来の定着装置は、例えば複写機において朝一番
でコピーを取る場合、複写機がウォームアップ終了直後
の定着装置は必ずしも十分に温まっているとは言えな
い。この状態のとき、連続コピーを取ると、定着ローラ
の熱が転写紙に奪われ、定着ローラ表面温度の落ち込み
が大きくなり、十分な定着性が得られないという問題が
あった。2. Description of the Related Art Fixing devices of the above type are well known. In the case of the conventional fixing device of this type, for example, in the case of making a copy in the morning in the copying machine, the fixing device immediately after the copying machine has finished warming up is not always sufficiently warm. In this state, if continuous copying is performed, the heat of the fixing roller is taken by the transfer paper, and the surface temperature of the fixing roller is greatly decreased, so that there is a problem that sufficient fixing property cannot be obtained.
【０００３】この定着ローラ表面温度の落ち込みを解消
するため、定着ローラを蓄熱タイプにしたり、定着装置
が十分に温まるまでコピー不可にしたりする方法が取ら
れている。しかしながら、ウォームアップ時間が長くな
り、待ち時間が増えてしまう。In order to eliminate this drop in the surface temperature of the fixing roller, a method of making the fixing roller a heat storage type or making copying impossible until the fixing device has been sufficiently warmed is taken. However, the warm-up time becomes long and the waiting time increases.
【０００４】ウォームアップ時間を短くするものとし
て、特開昭５９−２８１７７号公報にはウォームアップ
の前後で設定温度を切替る定着装置が記載されている。
また、特開昭５９−２８１７７号公報にはウォームアッ
プ期間中の定着ローラと加圧ローラの協動回転時の設定
温度を高く切替る定着装置が記載されている。As a means for shortening the warm-up time, Japanese Patent Application Laid-Open No. 59-28177 discloses a fixing device which switches the set temperature before and after the warm-up.
Further, Japanese Patent Application Laid-Open No. 59-28177 discloses a fixing device that switches the set temperature to a high value during cooperative rotation of the fixing roller and the pressure roller during the warm-up period.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記し
た定着装置ではウォームアップ時間が短縮されても立ち
上がった定着装置が十分に温まっておらず、連続コピー
時などに大きな定着ローラ表面温度の落ち込みが発生し
てしまうという問題を回避することができなかった。However, in the above-mentioned fixing device, even if the warm-up time is shortened, the fixing device which has started up is not sufficiently warmed, and a large drop in the surface temperature of the fixing roller occurs during continuous copying. I could not avoid the problem of doing.
【０００６】本発明は、上記した従来の問題を解消し、
ウォームアップ時間を増やすことなく定着ローラ表面温
度の落ち込みを軽減し、十分な定着性が得られる画像形
成装置の定着装置を提供することを目的とする。The present invention solves the above-mentioned conventional problems,
An object of the present invention is to provide a fixing device for an image forming apparatus that can reduce the drop in the surface temperature of the fixing roller without increasing the warm-up time and can obtain sufficient fixing properties.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成する本発
明の構成は、次の如くである。 （１）加熱手段により加熱され、表面温度が予め設定さ
れた設定温度に制御される定着ローラと、該定着ローラ
に圧接される加圧ローラと、前記定着ローラの表面温度
を検知する表面温度検知手段とを有し、前記定着ローラ
と加圧ローラにより未定着トナー像を担持した転写材を
挟持搬送し、その際未定着トナー像を転写材に定着する
ようにした画像形成装置の定着装置において、前記定着
ローラの表面温度を前記設定温度より高い温度に制御す
る高温設定温度を設け、画像形成装置のウォームアップ
終了後、前記定着ローラの表面温度が一時的に高温設定
温度に設定され、その際ウォームアップ開始時の定着ロ
ーラの表面温度に基づいて、高温設定温度の温度の高さ
および時間の長さの少なくとも一方が可変されることを
特徴とする定着装置。The structure of the present invention for achieving the above object is as follows. (1) A fixing roller which is heated by a heating means and whose surface temperature is controlled to a preset temperature, a pressure roller which is brought into pressure contact with the fixing roller, and a surface temperature detection which detects the surface temperature of the fixing roller. In the fixing device of the image forming apparatus, the transfer material carrying the unfixed toner image is sandwiched and conveyed by the fixing roller and the pressure roller, and the unfixed toner image is fixed to the transfer material at that time. A high temperature setting temperature is provided to control the surface temperature of the fixing roller to a temperature higher than the set temperature, and after the warm-up of the image forming apparatus is finished, the surface temperature of the fixing roller is temporarily set to the high temperature setting temperature. In addition, at least one of the height of the high temperature set temperature and the length of time is variable based on the surface temperature of the fixing roller at the start of warm-up. .
【０００８】（２）加熱手段により加熱され、表面温度
が予め設定された設定温度に制御される定着ローラと、
該定着ローラに圧接される加圧ローラと、前記定着ロー
ラの表面温度を検知する表面温度検知手段とを有し、前
記定着ローラと加圧ローラにより未定着トナー像を担持
した転写材を挟持搬送し、その際未定着トナー像を転写
材に定着するようにした画像形成装置の定着装置におい
て、前記定着ローラの表面温度を前記設定温度より高い
温度に制御する高温設定温度と、画像形成装置本体内ま
たは周囲の環境温度を検知する環境温度検知手段とを設
け、画像形成装置のウォームアップ終了後、前記定着ロ
ーラの表面温度が一時的に高温設定温度に設定され、そ
の際ウォームアップ開始時の画像形成装置本体の環境温
度に基づいて、高温設定温度の温度の高さおよび時間の
長さの少なくとも一方が可変されることを特徴とする定
着装置。(2) A fixing roller which is heated by heating means and whose surface temperature is controlled to a preset temperature.
A transfer roller carrying an unfixed toner image is sandwiched and conveyed by the fixing roller and the pressure roller, the pressure roller being in pressure contact with the fixing roller, and the surface temperature detecting means for detecting the surface temperature of the fixing roller. In the fixing device of the image forming apparatus, in which the unfixed toner image is fixed on the transfer material, a high set temperature for controlling the surface temperature of the fixing roller to a temperature higher than the set temperature, and an image forming apparatus main body An environmental temperature detecting means for detecting an internal or ambient environmental temperature is provided, and after the warm-up of the image forming apparatus is completed, the surface temperature of the fixing roller is temporarily set to a high set temperature, at which time the warm-up is started. A fixing device characterized in that at least one of a height of a high temperature setting temperature and a length of time is variable based on an environmental temperature of the main body of the image forming apparatus.
【０００９】（３）加熱手段により加熱され、表面温度
が予め設定された設定温度に制御される定着ローラと、
該定着ローラに圧接される加圧ローラと、前記定着ロー
ラの表面温度を検知する表面温度検知手段とを有し、前
記定着ローラと加圧ローラにより未定着トナー像を担持
した転写材を挟持搬送し、その際未定着トナー像を転写
材に定着するようにした画像形成装置の定着装置におい
て、前記定着ローラの表面温度を前記設定温度より高い
温度に制御する高温設定温度と、画像形成装置本体内ま
たは周囲の環境温度を検知する環境温度検知手段とを設
け、画像形成装置のウォームアップ終了後、前記定着ロ
ーラの表面温度が一時的に高温設定温度に設定され、そ
の際ウォームアップ開始時の定着ローラの表面温度と画
像形成装置本体の環境温度に基づいて、高温設定温度の
温度の高さおよび時間の長さの少なくとも一方が可変さ
れることを特徴とする定着装置。(3) A fixing roller which is heated by heating means and whose surface temperature is controlled to a preset temperature.
A transfer roller carrying an unfixed toner image is sandwiched and conveyed by the fixing roller and the pressure roller, the pressure roller being in pressure contact with the fixing roller, and the surface temperature detecting means for detecting the surface temperature of the fixing roller. In the fixing device of the image forming apparatus, in which the unfixed toner image is fixed on the transfer material, a high set temperature for controlling the surface temperature of the fixing roller to a temperature higher than the set temperature, and an image forming apparatus main body An environmental temperature detecting means for detecting an internal or ambient environmental temperature is provided, and after the warm-up of the image forming apparatus is finished, the surface temperature of the fixing roller is temporarily set to a high set temperature, in which case the warm-up start time is set. At least one of the height of the high set temperature and the length of time is variable based on the surface temperature of the fixing roller and the environmental temperature of the main body of the image forming apparatus. That the fixing device.
【００１０】[0010]
【作用】上記（１）の構成によれば、ウォームアップ終
了直後に連続コピーを取っても定着ローラの表面温度が
一時的に高温設定温度に設定されているので、定着ロー
ラの表面温度の落ち込みが小さく、十分な定着性を得る
ことができる。しかも、ウォームアップ開始時の定着ロ
ーラの表面温度に基づいて、高温設定温度の温度の高さ
および時間の長さの少なくとも一方が可変されるので、
ウォームアップ開始時に高温になっている定着ローラを
余分に温めてしまうことがなくなる。According to the above configuration (1), the surface temperature of the fixing roller is temporarily set to the high set temperature even if continuous copying is performed immediately after the warm-up is completed, so that the surface temperature of the fixing roller drops. Is small, and sufficient fixability can be obtained. Moreover, since at least one of the height of the high temperature setting temperature and the length of time is variable based on the surface temperature of the fixing roller at the start of warm-up,
The fixing roller, which is hot at the start of warm-up, will not be heated excessively.
【００１１】上記（２）の構成によれば、定着ローラの
表面温度の落ち込みに影響を与える画像形成装置本体ま
たはその周囲の環境温度に基づいて、高温設定温度の温
度の高さおよび時間の長さの少なくとも一方が可変され
るので、連続コピーを取っても定着ローラの表面温度が
一時的に高温設定温度に設定されているので、定着ロー
ラの表面温度の落ち込みが小さくすることができる。According to the above configuration (2), the height of the high set temperature and the length of time are set based on the environmental temperature of the main body of the image forming apparatus or its surroundings, which affects the drop of the surface temperature of the fixing roller. Since at least one of the two is variable, the surface temperature of the fixing roller is temporarily set to the high set temperature even when continuous copying is performed, so that the drop in the surface temperature of the fixing roller can be reduced.
【００１２】上記（３）の構成によれば、定着ローラの
表面温度の落ち込みに影響を与える画像形成装置本体内
またはその周囲の温度とウォームアップ開始時の定着ロ
ーラの表面温度とに基づいて高温設定温度の温度の高さ
および時間の長さの少なくとも一方が可変されるので、
連続コピーを取っても定着ローラの表面温度が一時的に
高温設定温度に設定され、定着ローラの表面温度の落ち
込みが小さくすることができ、かつウォームアップ開始
時に高温になっている定着ローラを余分に温めてしまう
ことを防止できる。According to the above configuration (3), the temperature is high based on the temperature inside or around the main body of the image forming apparatus that affects the drop in the surface temperature of the fixing roller and the surface temperature of the fixing roller at the start of warm-up. Since at least one of the height of the set temperature and the length of time can be changed,
Even if continuous copies are taken, the surface temperature of the fixing roller is temporarily set to the high set temperature, the drop in the surface temperature of the fixing roller can be reduced, and the extra fixing roller that is hot at the start of warm-up is removed. You can prevent it from warming up.
【００１３】[0013]
【実施例】以下、本発明の実施例を添付図面に従って説
明する。図１は、本発明に係る定着装置の温度制御の概
略を示す説明図である。図１において、符号１は定着ロ
ーラ、２は定着ローラ１に圧接される加圧ローラ２、そ
して３は定着ローラ１に内蔵され加熱手段としてのヒー
タである。また、符号４は制御手段であるＣＰＵ、５は
プログラムが書き込まれているＲＯＭ、６は制御データ
等をメモリするＲＡＭ、７はヒータ３の給電手段である
ヒータドライブ回路である。本実施例の定着装置では、
定着ローラ１の表面温度を検知する表面温度検知手段と
しての第１サーミスタ８と、画像形成装置、例えば複写
機本体内または周囲の環境温度を検知する環境温度検知
手段としての第２サーミスタ９とを備えている。Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an explanatory diagram showing an outline of temperature control of a fixing device according to the present invention. In FIG. 1, reference numeral 1 is a fixing roller, 2 is a pressure roller 2 pressed against the fixing roller 1, and 3 is a heater incorporated in the fixing roller 1 as a heating means. Further, reference numeral 4 is a CPU which is a control means, 5 is a ROM in which a program is written, 6 is a RAM which stores control data and the like, and 7 is a heater drive circuit which is a power feeding means of the heater 3. In the fixing device of this embodiment,
A first thermistor 8 as a surface temperature detecting means for detecting the surface temperature of the fixing roller 1 and a second thermistor 9 as an environmental temperature detecting means for detecting an environmental temperature inside or around an image forming apparatus such as a copying machine main body. I have it.
【００１４】上記ＲＯＭ５には、上記第１サーミスタ８
から入力される温度検出信号に基づき定着ローラ表面の
温度制御を行うプログラムや、第２サーミスタ９から入
力される温度検出信号により高温設定温度の変換や、高
温設定温度で温度制御する設定時間の変換する為のプロ
グラムや、その他、複写動作、待機時の処理等の多くの
プログラムが書き込まれている。The ROM 5 includes the first thermistor 8
A program for controlling the temperature of the surface of the fixing roller based on a temperature detection signal input from, or conversion of a high temperature set temperature by a temperature detection signal input from the second thermistor 9 or conversion of a set time for temperature control at the high temperature set temperature. In addition, many programs such as a copy operation, a standby process, and the like are written.
【００１５】ＲＡＭ６には、定着ローラ１の表面温度の
設定温度や各条件によって定着ローラ表面温度を切り替
える為の高温設定温度や、この高温設定温度で温度制御
する時間を切り替える為の時間データや、その他露光ラ
ンプの電圧データ、バイアス電圧のデータ等がメモリさ
れている。In the RAM 6, a high temperature set temperature for changing the surface temperature of the fixing roller 1 according to the set temperature of the fixing roller 1 and each condition, time data for changing the temperature control time at the high temperature set temperature, and In addition, voltage data of the exposure lamp, bias voltage data, and the like are stored in the memory.
【００１６】ＣＰＵ４は、ＲＯＭ５に書き込まれている
プログラムに基づいて制御し、必要に応じてＲＡＭ６に
メモリされているデータを読み込んで、複写動作や定着
温度等条件が設定している。The CPU 4 controls on the basis of the program written in the ROM 5, reads the data stored in the RAM 6 as necessary, and sets conditions such as a copying operation and a fixing temperature.
【００１７】第１サーミスタ８は、定着ローラの表面温
度を検出する為のもの、第２サーミスタ９は複写機の機
内温度、すなわち雰囲気温度を検出し、機内にある紙の
雰囲気温度を検知する方法、又は複写機の機外の周囲温
度すなわち複写機が設置されている環境を検出し、複写
機全体の温度や検知する方法によって定着ローラ表面温
度の制御を各条件に合った制御温度及び制御時間で行う
為の検出手段であり、ＣＰＵ４のＡ／Ｄ入力に接続され
ている。The first thermistor 8 is used to detect the surface temperature of the fixing roller, and the second thermistor 9 is used to detect the temperature inside the copying machine, that is, the ambient temperature, to detect the ambient temperature of the paper inside the copying machine. , Or the temperature outside the copying machine, that is, the environment in which the copying machine is installed, and the temperature of the entire copying machine is detected and the temperature of the fixing roller is controlled by a control temperature and control time that meets each condition. It is a detecting means for carrying out the above, and is connected to the A / D input of the CPU 4.
【００１８】ヒータドライブ回路７は商用電源から給電
されており、ＣＰＵ４から出力されるヒータＯＮ・ＯＦ
Ｆのトリガ信号により駆動し、定着ヒータ３をＯＮ・Ｏ
ＦＦしている。定着ヒータ３がＯＮし、定着ローラ表面
温度が上昇していくと、その温度を第１サーミスタ８が
検出し、設定温度又は制御温度になると定着ヒータ３を
ＯＦＦする。この繰返しで定着ローラ１の表面温度が制
御される。The heater drive circuit 7 is supplied with power from a commercial power source, and the heater ON / OF output from the CPU 4 is output.
Driven by the F trigger signal, the fixing heater 3 is turned ON / O.
It is FF. When the fixing heater 3 turns on and the surface temperature of the fixing roller rises, the first thermistor 8 detects the temperature, and when the temperature reaches the set temperature or the control temperature, the fixing heater 3 turns off. By repeating this, the surface temperature of the fixing roller 1 is controlled.
【００１９】かく構成の定着装置では、ＲＯＭ５に書き
込まれたプログラムにより、定着ローラ１の表面温度が
予め設定された設定温度、例えば１８５℃に制御されて
いる。ここで、朝一番において複写機のメインスイッチ
をＯＮすると、定着ヒータ３がＯＮして定着装置はウォ
ーミングアップを開始し、第２図のグラフに示すよう
に、定着ローラ１の表面温度Ｔｄが上記設定温度Ｔｏ、
すなわち１８５℃に達すると、ウォーミングアップが終
了しコピー可能な状態になる。このとき、定着ローラ１
は十分に温まっておらず、ここで連続コピーを取ると、
第２図（ａ）のグラフに示すように、定着ローラ１の表
面温度Ｔｄが落ち込み、良好な定着性が得られないとい
う問題があることは先に説明した。In the thus constructed fixing device, the surface temperature of the fixing roller 1 is controlled to a preset temperature, for example, 185 ° C. by the program written in the ROM 5. Here, when the main switch of the copying machine is turned on in the first thing in the morning, the fixing heater 3 is turned on and the fixing device starts warming up, and as shown in the graph of FIG. 2, the surface temperature Td of the fixing roller 1 is set to the above-mentioned setting. Temperature To,
That is, when the temperature reaches 185 ° C., the warming-up is completed and the copying is ready. At this time, the fixing roller 1
Is not warm enough, so if you make a continuous copy here,
As described above with reference to the graph of FIG. 2A, the surface temperature Td of the fixing roller 1 drops, and there is a problem in that good fixing properties cannot be obtained.
【００２０】そこで、本発明では定着ローラ１の表面温
度Ｔｄをウォーミングアップが終了後、一時的に設定温
度Ｔｏよりも高温の高温設定温度Ｔｕに設定する。かく
設定すると、第２図（ｂ）のグラフに示すように、ウォ
ーミングアップ終了後に連続コピーを取っても設定温度
Ｔｏ程度へ低下するだけであり、良好な定着性が得られ
る。Therefore, in the present invention, the surface temperature Td of the fixing roller 1 is temporarily set to a high set temperature Tu which is higher than the set temperature To after warming up. With this setting, as shown in the graph of FIG. 2 (b), even if continuous copying is performed after the warm-up is completed, the temperature is only lowered to the set temperature To, and good fixability is obtained.
【００２１】かくして、定着ローラ１の表面温度Ｔｄを
ウォーミングアップが終了後、一定時間を設定温度Ｔｏ
よりも高温の高温設定温度Ｔｕに設定することで、良好
な定着性が得られるが、複写機のメインスイッチＯＮ時
は定着ローラ１が冷えている朝一番のみに限らず、一時
的にメインスイッチをＯＦＦしたとき等のように定着ロ
ーラ１の表面温度Ｔｄが高温になっている場合も多々あ
る。そして、定着ローラ１が高温のときは、ウォーミン
グアップが終了後にコピーを取っても定着ローラ１の表
面温度Ｔｄはさほど落ち込まない。従って、画一的にウ
ォーミングアップが終了後、一定時間を設定温度Ｔｏよ
りも高温の高温設定温度Ｔｕに設定することは、無駄な
電力を消費してしまうことになる。Thus, after the surface temperature Td of the fixing roller 1 is warmed up, a fixed time is set for the set temperature To.
By setting the temperature higher than the set temperature Tu, a good fixing property can be obtained. However, when the main switch of the copying machine is turned on, the fixing roller 1 is not limited to the first morning and the main switch is temporarily turned off. There are many cases where the surface temperature Td of the fixing roller 1 is high, such as when is turned off. When the fixing roller 1 is at a high temperature, the surface temperature Td of the fixing roller 1 does not drop so much even if a copy is taken after the warming up is completed. Therefore, if the fixed time is uniformly set to the high temperature set temperature Tu higher than the set temperature To after the warming up is finished, useless power is consumed.
【００２２】そこで、本発明は上記定着ローラ１の表面
温度Ｔｄをウォーミングアップが終了後、一定時間を設
定温度Ｔｏよりも高温の高温設定温度Ｔｕに設定する構
成に加えて、ウォームアップ開始時の定着ローラ１の表
面温度Ｔｄを第１サーミスタ８で検出し、検出値に基づ
いて、高温設定温度Ｔｕの高さおよび高温設定温度Ｔｕ
にしている時間の長さの少なくとも一方を変更するよう
に制御している。Therefore, according to the present invention, after the surface temperature Td of the fixing roller 1 is warmed up, a fixed time is set to a high temperature set temperature Tu which is higher than the set temperature To. The surface temperature Td of the roller 1 is detected by the first thermistor 8, and the height of the high temperature set temperature Tu and the high temperature set temperature Tu are detected based on the detected value.
You are controlling to change at least one of the length of time.
【００２３】第２図（ｂ）のグラフでは、高温設定温度
Ｔｕの高さが一定であり、ウォームアップ開始時の定着
ローラ１の表面温度Ｔｄが低いときに高温設定温度Ｔｕ
に設定する時間をｔ2とし、ウォームアップ開始時の定
着ローラ１の表面温度Ｔｄが高いときには高温設定温度
Ｔｕに設定する時間をｔ2よりも短時間のｔ1とするよう
に制御している。In the graph of FIG. 2B, the high temperature set temperature Tu is constant and the high temperature set temperature Tu is low when the surface temperature Td of the fixing roller 1 at the start of warm-up is low.
Is set to t 2, and when the surface temperature Td of the fixing roller 1 at the start of warm-up is high, the time to be set to the high temperature setting temperature Tu is set to t 1 which is shorter than t 2 . ..
【００２４】第２図（ｃ）のグラフでは、高温設定温度
Ｔｕに設定する時間の長さが一定であり、ウォームアッ
プ開始時の定着ローラ１の表面温度Ｔｄが低いときに高
温設定温度の高さをＴｕ2とし、ウォームアップ開始時
の定着ローラ１の表面温度Ｔｄが高いときには高温設定
温度の高さをＴｕ2よりも低いＴｕ1とするように制御し
ている。In the graph of FIG. 2 (c), the high temperature set temperature Tu is high when the set temperature Tu is constant and the surface temperature Td of the fixing roller 1 at the start of warm-up is low. Is set to Tu 2, and when the surface temperature Td of the fixing roller 1 at the start of warm-up is high, the height of the high temperature setting temperature is set to Tu 1 lower than Tu 2 .
【００２５】かくして、ウォーミングアップが終了後の
高温設定温度Ｔｕを定着ローラ１の蓄熱状態に応じて温
度または時間を制御するので、コピーしても表面温度Ｔ
ｄ落ち込みによる定着不良を防止し、しかも高温設定温
度Ｔｕ設定による無駄な電力消費も防止することができ
る。なお、ウォームアップ開始時の定着ローラ１の表面
温度Ｔｄに基づいて、高温設定温度Ｔｕの高さおよび高
温設定温度Ｔｕの両方を変更するように制御してもよ
い。Thus, the temperature or time of the high temperature set temperature Tu after the warming up is controlled in accordance with the heat storage state of the fixing roller 1, so that the surface temperature T is maintained even if copying is performed.
It is possible to prevent the fixing failure due to the d drop and also to prevent the wasteful power consumption due to the setting of the high temperature setting temperature Tu. Note that both the height of the high temperature set temperature Tu and the high temperature set temperature Tu may be controlled to be changed based on the surface temperature Td of the fixing roller 1 at the start of warming up.
【００２６】ところで、コピーを取ることによる定着ロ
ーラ１の表面温度Ｔｄの落ち込みは通紙される転写材、
複写機内またはその周囲の温度によっても左右され、こ
のような環境温度はウォームアップ開始時の定着ローラ
１の表面温度Ｔｄでは判断できない。By the way, the drop of the surface temperature Td of the fixing roller 1 caused by making a copy is caused by the transfer material to be passed,
The environmental temperature depends on the temperature inside or around the copying machine, and such an environmental temperature cannot be judged by the surface temperature Td of the fixing roller 1 at the start of warm-up.
【００２７】そこで、本発明ではウォームアップ開始時
の複写機内またはその周囲の環境温度を第２サーミスタ
９で検出し、その検出温度に基づいて、高温設定温度Ｔ
ｕの高さおよび高温設定温度Ｔｕにしている時間の長さ
の少なくとも一方を変更するように制御する。すなわ
ち、上記実施例と同様ウォームアップ開始時の環境温度
が低いときに高温設定温度Ｔｕに設定する時間をｔ2ま
たは高温設定温度の高さをＴｕ2とし、環境温度が高い
ときには高温設定温度Ｔｕに設定する時間をｔ1または
高温設定温度の高さをＴｕ1とするように制御してい
る。Therefore, in the present invention, the environmental temperature inside or around the copying machine at the start of warm-up is detected by the second thermistor 9, and the high temperature set temperature T is detected based on the detected temperature.
Control is performed so as to change at least one of the height of u and the length of time during which the high temperature setting temperature Tu is maintained. That is, as in the above embodiment, the time for setting the high temperature set temperature Tu when the environment temperature at the start of warm-up is low is t 2 or the height of the high temperature set temperature is Tu 2, and the high temperature set temperature Tu is high when the environment temperature is high. It is controlled so that the time to be set to t 1 or the height of the high temperature set temperature is Tu 1 .
【００２８】かく構成すれば、環境温度に応じてので、
定着ローラ１の表面温度Ｔｄの落ち込みによる定着不良
を防止できる。With this structure, since it depends on the ambient temperature,
It is possible to prevent fixing failure due to a drop in the surface temperature Td of the fixing roller 1.
【００２９】さらに、本発明ではウォームアップ開始時
の定着ローラ１の表面温度Ｔｄと複写機内またはその周
囲の環境温度とを踏まえて高温設定温度Ｔｕを設定する
こともできる。Further, in the present invention, the high temperature setting temperature Tu can be set in consideration of the surface temperature Td of the fixing roller 1 at the start of warm-up and the environmental temperature inside or around the copying machine.
【００３０】[0030]
【表１】 [Table 1]
【００３１】表１は、複写機内またはその周囲の環境温
度に応じて高温設定温度Ｔｕの高さが一定にし、定着ロ
ーラ１の表面温度Ｔｄに応じて高温設定温度Ｔｕに設定
する時間を変化させた場合の例である。Table 1 shows that the height of the high temperature set temperature Tu is constant according to the environmental temperature inside or around the copying machine, and the time to set the high temperature set temperature Tu is changed according to the surface temperature Td of the fixing roller 1. This is an example of the case.
【００３２】[0032]
【表２】 [Table 2]
【００３３】表２は、複写機内またはその周囲の環境温
度に応じて高温設定温度Ｔｕの高さが一定にし、定着ロ
ーラ１の表面温度Ｔｄに応じて高温設定温度Ｔｕの高さ
を変化させた場合の例である。Table 2 shows that the height of the high temperature set temperature Tu is constant according to the environmental temperature inside or around the copying machine, and the height of the high temperature set temperature Tu is changed according to the surface temperature Td of the fixing roller 1. This is an example of the case.
【００３４】[0034]
【発明の効果】請求項１の構成によれば、定着ローラの
表面温度の落ち込みが小さく、十分な定着性を得ること
ができ、ウォームアップ開始時に高温になっている定着
ローラを余分に温めてしまうことも防止できる。According to the first aspect of the present invention, the surface temperature of the fixing roller is less likely to drop, sufficient fixing performance can be obtained, and the fixing roller which is high in temperature at the start of warm-up is additionally warmed. It can also be prevented.
【００３５】請求項２の構成によれば、定着ローラの表
面温度が画像形成装置本体内またはその周囲の温度に応
じた高温設定温度に設定されているので、定着ローラの
表面温度の落ち込みが小さくすることができる。According to the second aspect of the invention, since the surface temperature of the fixing roller is set to a high set temperature according to the temperature inside or around the image forming apparatus main body, the drop of the surface temperature of the fixing roller is small. can do.
【００３６】請求項３の構成によれば、ウォームアップ
開始時の定着ローラの表面温度と画像形成装置本体内ま
たはその周囲の温度に応じた高温設定温度に設定されて
いるので、定着ローラの表面温度の落ち込みが小さくす
ることができ、しかも定着ローラを余分に温めてしまう
ことを防止できる。According to the third aspect of the invention, since the surface temperature of the fixing roller at the start of warm-up and the high temperature set temperature according to the temperature inside or around the main body of the image forming apparatus are set, the surface of the fixing roller is set. It is possible to reduce the temperature drop and prevent the fixing roller from being overheated.
【図１】本発明に係る定着装置の温度制御の概略を示す
説明図である。FIG. 1 is an explanatory diagram showing an outline of temperature control of a fixing device according to the present invention.
【図２】第２図の（ａ），（ｂ），（ｃ）は、定着ロー
ラ１の表面温度の動きを示し、（ａ）は従来の動きを示
したもので、（ｂ）は本発明の高温設定温度が一定で、
設定時間が切り替わる場合の例で、（ｃ）は設定時間一
定で高温設定温度が切り替わる例である。2 (a), (b), and (c) show the movement of the surface temperature of the fixing roller 1, FIG. 2 (a) shows the conventional movement, and FIG. The high temperature setting temperature of the invention is constant,
In the example in which the set time is switched, (c) is an example in which the high temperature set temperature is switched while the set time is constant.
１ 定着ローラ ２ 加圧ローラ ３ ヒータ ４ ＣＰＵ ８ 第１サーミスタ ９ 第２サーミスタ 1 fixing roller 2 pressure roller 3 heater 4 CPU 8 first thermistor 9 second thermistor
Claims (3)
め設定された設定温度に制御される定着ローラと、該定
着ローラに圧接される加圧ローラと、前記定着ローラの
表面温度を検知する表面温度検知手段とを有し、前記定
着ローラと加圧ローラにより未定着トナー像を担持した
転写材を挟持搬送し、その際未定着トナー像を転写材に
定着するようにした画像形成装置の定着装置において、 前記定着ローラの表面温度を前記設定温度より高い温度
に制御する高温設定温度を設け、画像形成装置のウォー
ムアップ終了後、前記定着ローラの表面温度が一時的に
高温設定温度に設定され、その際ウォームアップ開始時
の定着ローラの表面温度に基づいて、高温設定温度の温
度の高さおよび時間の長さの少なくとも一方が可変され
ることを特徴とする定着装置。1. A fixing roller which is heated by a heating means and whose surface temperature is controlled to a preset temperature, a pressure roller which is brought into pressure contact with the fixing roller, and a surface which detects the surface temperature of the fixing roller. Fixing of an image forming apparatus having a temperature detecting means, and nipping and conveying a transfer material carrying an unfixed toner image by the fixing roller and a pressure roller, and fixing the unfixed toner image on the transfer material at that time. In the apparatus, a high temperature setting temperature for controlling the surface temperature of the fixing roller to a temperature higher than the set temperature is provided, and after the warm-up of the image forming apparatus is finished, the surface temperature of the fixing roller is temporarily set to the high temperature setting temperature. At that time, at least one of the height of the high temperature set temperature and the length of time is variable based on the surface temperature of the fixing roller at the start of warm-up. The fixing device.
め設定された設定温度に制御される定着ローラと、該定
着ローラに圧接される加圧ローラと、前記定着ローラの
表面温度を検知する表面温度検知手段とを有し、前記定
着ローラと加圧ローラにより未定着トナー像を担持した
転写材を挟持搬送し、その際未定着トナー像を転写材に
定着するようにした画像形成装置の定着装置において、 前記定着ローラの表面温度を前記設定温度より高い温度
に制御する高温設定温度と、画像形成装置本体内または
周囲の環境温度を検知する環境温度検知手段とを設け、
画像形成装置のウォームアップ終了後、前記定着ローラ
の表面温度が一時的に高温設定温度に設定され、その際
ウォームアップ開始時の画像形成装置本体の環境温度に
基づいて、高温設定温度の温度の高さおよび時間の長さ
の少なくとも一方が可変されることを特徴とする定着装
置。2. A fixing roller which is heated by heating means and whose surface temperature is controlled to a preset temperature, a pressure roller which is pressed against the fixing roller, and a surface which detects the surface temperature of the fixing roller. Fixing of an image forming apparatus having a temperature detecting means, and nipping and conveying a transfer material carrying an unfixed toner image by the fixing roller and a pressure roller, and fixing the unfixed toner image on the transfer material at that time. In the apparatus, a high temperature set temperature that controls the surface temperature of the fixing roller to a temperature higher than the set temperature, and an environmental temperature detection unit that detects an environmental temperature inside or around the image forming apparatus main body are provided.
After the warm-up of the image forming apparatus is finished, the surface temperature of the fixing roller is temporarily set to a high set temperature, and at that time, based on the environmental temperature of the image forming apparatus main body at the start of warm-up, At least one of a height and a length of time is variable, and a fixing device.
め設定された設定温度に制御される定着ローラと、該定
着ローラに圧接される加圧ローラと、前記定着ローラの
表面温度を検知する表面温度検知手段とを有し、前記定
着ローラと加圧ローラにより未定着トナー像を担持した
転写材を挟持搬送し、その際未定着トナー像を転写材に
定着するようにした画像形成装置の定着装置において、 前記定着ローラの表面温度を前記設定温度より高い温度
に制御する高温設定温度と、画像形成装置本体内または
周囲の環境温度を検知する環境温度検知手段とを設け、
画像形成装置のウォームアップ終了後、前記定着ローラ
の表面温度が一時的に高温設定温度に設定され、その際
ウォームアップ開始時の定着ローラの表面温度と画像形
成装置本体の環境温度に基づいて、高温設定温度の温度
の高さおよび時間の長さの少なくとも一方が可変される
ことを特徴とする定着装置。3. A fixing roller which is heated by a heating means and whose surface temperature is controlled to a preset temperature, a pressure roller which is brought into pressure contact with the fixing roller, and a surface which detects the surface temperature of the fixing roller. Fixing of an image forming apparatus having a temperature detecting means, and nipping and conveying a transfer material carrying an unfixed toner image by the fixing roller and a pressure roller, and fixing the unfixed toner image on the transfer material at that time. In the apparatus, a high temperature set temperature that controls the surface temperature of the fixing roller to a temperature higher than the set temperature, and an environmental temperature detection unit that detects an environmental temperature inside or around the image forming apparatus main body are provided.
After the warm-up of the image forming apparatus, the surface temperature of the fixing roller is temporarily set to a high set temperature, based on the surface temperature of the fixing roller at the start of warm-up and the environmental temperature of the image forming apparatus main body, At least one of a height of a high temperature set temperature and a length of time is variable, and a fixing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03288769A JP3119690B2 (en) | 1991-11-05 | 1991-11-05 | Fixing device for image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03288769A JP3119690B2 (en) | 1991-11-05 | 1991-11-05 | Fixing device for image forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05127565A true JPH05127565A (en) | 1993-05-25 |
| JP3119690B2 JP3119690B2 (en) | 2000-12-25 |
Family
ID=17734477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03288769A Expired - Fee Related JP3119690B2 (en) | 1991-11-05 | 1991-11-05 | Fixing device for image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3119690B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003036006A (en) * | 2001-07-24 | 2003-02-07 | Brother Ind Ltd | Fixing device and image forming apparatus provided with the fixing device |
| US7395003B2 (en) | 2004-03-01 | 2008-07-01 | Brother Kogyo Kabushiki Kaisha | Fuser temperature control providing faster wake up from cold start by optimizing standby temperature of fuser roller |
| US7493059B2 (en) | 2005-04-22 | 2009-02-17 | Ricoh Company, Ltd. | Method and apparatus for image forming with an improved warm-up control |
| US7519305B2 (en) | 2004-04-14 | 2009-04-14 | Sharp Kabushiki Kaisha | Fixing device and image forming apparatus including the same |
| JP2017026741A (en) * | 2015-07-21 | 2017-02-02 | コニカミノルタ株式会社 | Image forming apparatus, control method, and control program |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4530770B2 (en) | 2004-09-08 | 2010-08-25 | 株式会社リコー | Fixing apparatus and image forming apparatus |
-
1991
- 1991-11-05 JP JP03288769A patent/JP3119690B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003036006A (en) * | 2001-07-24 | 2003-02-07 | Brother Ind Ltd | Fixing device and image forming apparatus provided with the fixing device |
| US7336405B2 (en) * | 2001-07-24 | 2008-02-26 | Brother Kogyo Kabushiki Kaisha | Thermal fixing device for controlling the temperature of a heat member to melt toner on a recording sheet |
| US7395003B2 (en) | 2004-03-01 | 2008-07-01 | Brother Kogyo Kabushiki Kaisha | Fuser temperature control providing faster wake up from cold start by optimizing standby temperature of fuser roller |
| US7519305B2 (en) | 2004-04-14 | 2009-04-14 | Sharp Kabushiki Kaisha | Fixing device and image forming apparatus including the same |
| EP1739502A4 (en) * | 2004-04-14 | 2013-04-10 | Sharp Kk | Fixing device and image forming apparatus using the same |
| US7493059B2 (en) | 2005-04-22 | 2009-02-17 | Ricoh Company, Ltd. | Method and apparatus for image forming with an improved warm-up control |
| JP2017026741A (en) * | 2015-07-21 | 2017-02-02 | コニカミノルタ株式会社 | Image forming apparatus, control method, and control program |
| US9915898B2 (en) | 2015-07-21 | 2018-03-13 | Konica Minolta, Inc. | Image forming apparatus, control method, and non-transitory storage medium for efficiently reducing operational start time |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3119690B2 (en) | 2000-12-25 |
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