JPH04250484A - Temperature controller for fixing unit - Google Patents
Temperature controller for fixing unitInfo
- Publication number
- JPH04250484A JPH04250484A JP162791A JP162791A JPH04250484A JP H04250484 A JPH04250484 A JP H04250484A JP 162791 A JP162791 A JP 162791A JP 162791 A JP162791 A JP 162791A JP H04250484 A JPH04250484 A JP H04250484A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- fixing
- temperature range
- warming
- recording paper
- 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
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 230000002411 adverse Effects 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 108091008695 photoreceptors Proteins 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Landscapes
- Fixing For Electrophotography (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は画像形成装置に設けられ
る定着器のウォーミングアップ時間を短縮する手段に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to means for shortening the warm-up time of a fixing device provided in an image forming apparatus.
【０００２】0002
【従来の技術】一般に画像形成装置は電源が投入される
とその駆動に先立って例えば定着器を所定の温度になる
まで加熱するウォーミングアップが行われたのち所定の
プロセスに従って駆動されるようになっている。そして
、画像形成装置によって感光体ドラム面に形成されたト
ナー画像が転写された記録紙は該感光体と分離され所定
の搬送経路に従って定着器に搬送される。そして、所定
の温度に加熱されている一対の定着ローラの加熱押圧と
回転とによって前記記録紙上のトナー画像がつぎつぎに
融着して定着される。2. Description of the Related Art In general, when an image forming apparatus is powered on, before it is driven, a warming-up process is performed in which, for example, the fixing device is heated to a predetermined temperature, and then the image forming apparatus is driven according to a predetermined process. There is. Then, the recording paper onto which the toner image formed on the surface of the photoreceptor drum is transferred by the image forming apparatus is separated from the photoreceptor and transported to the fixing device along a predetermined transport path. Then, the toner images on the recording paper are successively fused and fixed by heating, pressing, and rotating a pair of fixing rollers that are heated to a predetermined temperature.
【０００３】従来、定着器のウォーミングアップ終了温
度は該定着器の駆動時の温度変動をコントロールする通
常制御温度範囲の中央温度に設定されていた。Conventionally, the warming-up end temperature of the fixing device has been set to the center temperature of a normal control temperature range that controls temperature fluctuations during driving of the fixing device.
【０００４】0004
【発明が解決しようとする課題】通常、画像形成装置の
ウォーミングアップ時間は記録紙上のトナー画像を融着
するために必要な定着温度に定着ローラを加熱する時間
で決められている。従来このウォーミングアップ終了温
度は前述したように前記定着器の駆動時に連続して行わ
れる前記記録紙の定着等によって生ずる定着ローラの表
面温度の変動を常に定められた温度範囲内に保つように
制御する通常制御温度範囲の中央温度で設定されていた
。即ち、画像形成装置のタイプによって異るが一般に前
記通常制御温度範囲は例えば１６０℃±２℃に設定され
前記ヒータの電源をＯＮしてから該通常制御温度範囲の
中央温度（１６０℃）まで立上げるには５〜７分のウォ
ーミングアップ時間を要していた。さらにこの通常制御
温度範囲は狭くウォーミングアップ終了温度の１６０℃
に達して前記ヒータの電源が切られても予熱で前記定着
ローラの表面温度が上昇するような材質のローラを使用
した場合には、前記通常制御温度範囲の上限温度を越え
るいわゆるオーバーシュートを起すのを防ぐために前記
下限温度のかなり手前からゆっくりと温度を上昇させる
ようにしているので前述したようなウォーミングアップ
時間がかゝりユーザにとってこの待ち時間は大変煩わし
いものである。Generally, the warm-up time of an image forming apparatus is determined by the time required to heat the fixing roller to the fixing temperature necessary to fuse the toner image on the recording paper. Conventionally, this warm-up end temperature is controlled so as to always keep within a predetermined temperature range the fluctuations in the surface temperature of the fixing roller caused by the continuous fixing of the recording paper when the fixing device is driven, as described above. Normally, the temperature was set at the center of the control temperature range. That is, although it differs depending on the type of image forming apparatus, the normal control temperature range is generally set to, for example, 160°C ± 2°C, and after the heater is turned on, the temperature is increased to the center temperature (160°C) of the normal control temperature range. It took 5 to 7 minutes of warm-up time to get up. Furthermore, this normal control temperature range is narrow and reaches the warming-up end temperature of 160℃.
If a roller is made of a material that causes the surface temperature of the fixing roller to rise due to preheating even if the heater is turned off when the heating temperature reaches 100, a so-called overshoot will occur that exceeds the upper limit temperature of the normal control temperature range. In order to prevent this, the temperature is slowly increased from well before the lower limit temperature, so the above-mentioned warm-up time is required, and this waiting time is very troublesome for the user.
【０００５】本発明はこのような問題点を解決して画像
形成装置のウォーミングアップ時間を大幅に短縮するこ
とのできる定着器の温度制御装置の提供を課題目的とす
る。SUMMARY OF THE INVENTION It is an object of the present invention to provide a temperature control device for a fixing device that can solve these problems and significantly shorten the warm-up time of an image forming apparatus.
【０００６】[0006]
【課題を解決するための手段】この目的は記録紙上に形
成されたトナー画像を定着する画像形成装置の定着器に
おいて、一対の定着ローラと該定着ローラを加熱するヒ
ータとを有する前記定着器のウォーミングアップ終了温
度を前記トナー画像が前記記録紙に定着可能な定着保障
温度範囲の保障下限温度に設定したことを特徴とする定
着器の温度制御装置によって達成される。[Means for Solving the Problems] This object is to provide a fixing device of an image forming apparatus that fixes a toner image formed on a recording paper, the fixing device having a pair of fixing rollers and a heater that heats the fixing roller. This is achieved by a temperature control device for a fixing device, characterized in that the warming-up end temperature is set to a guaranteed lower limit temperature in a guaranteed fixing temperature range in which the toner image can be fixed on the recording paper.
【０００７】[0007]
【実施例】本発明の１実施例を図１の定着器の定着保障
温度範囲と通常制御温度範囲との関係を示しウォーミン
グアップの状態と駆動時のコントロール状態を表わすグ
ラフと図２の画像形成装置に配設される定着器の位置と
構成とを示す概略図とによって説明する。しかし本発明
は本実施例に限定されるものではない。[Embodiment] An embodiment of the present invention is illustrated by a graph showing the relationship between the fixing guarantee temperature range and the normal control temperature range of the fixing device in FIG. The explanation will be given with reference to a schematic diagram showing the position and configuration of the fixing device disposed in the fixing device. However, the present invention is not limited to this example.
【０００８】図２に示すように画像形成装置１に配設さ
れる定着器５には上、下に一対となって構成される定着
ローラ対６が設けられ該各定着ローラ内にはヒータ７が
内蔵されている。As shown in FIG. 2, the fixing device 5 disposed in the image forming apparatus 1 is provided with a pair of fixing rollers 6 arranged at the upper and lower sides, and a heater 7 is installed in each of the fixing rollers. is built-in.
【０００９】そして、前記画像形成装置１の電源が投入
されてウォーミングアップが開始され、前記ヒータ７の
加熱によって前記定着ローラ対６が所定の定着保証温度
の下限の表面温度ａ１に達し、他の機構部と共にウォー
ミングアップが終了したのち該画像形成装置１は所定の
プロセスに従って駆動される。Then, the power of the image forming apparatus 1 is turned on and warming-up is started, and the fixing roller pair 6 reaches the lower limit surface temperature a1 of the predetermined guaranteed fixing temperature by the heating of the heater 7, and other mechanisms After the warm-up with the image forming apparatus 1 is completed, the image forming apparatus 1 is driven according to a predetermined process.
【００１０】そして、感光体ドラム２面上に形成された
トナー画像が記録紙３に転写されたのち該記録紙３は前
記感光体ドラム２と分離され矢印方向所定の搬送経路に
従って前記定着器５に搬送され前記定着ローラ対６の加
熱押圧と回転とによって前記記録紙３上のトナー画像が
つぎつぎに融着して定着される。After the toner image formed on the surface of the photoreceptor drum 2 is transferred to the recording paper 3, the recording paper 3 is separated from the photoreceptor drum 2 and moved to the fixing device 5 along a predetermined conveyance path in the direction of the arrow. The toner images on the recording paper 3 are successively fused and fixed by heating and pressing and rotating the pair of fixing rollers 6.
【００１１】本発明は前述した問題点を取除くために前
述の通常制御温度範囲とは別に定着保障温度範囲を設け
て定着器のウォーミングアップ終了温度を下記のように
設定した。図１はこの両者の関係を示すと共に定着器の
ウォーミングアップ時と駆動時との温度コントロール状
態を示したものである。即ち、縦軸に温度Ｃと横軸に時
間ｔを取り通常制御温度範囲Ｂと共にトナー画像の定着
可能な保障下限温度ａ１と前記記録紙３や定着される画
像に悪影響のない定着の保障上限温度ａ２とによって範
囲を定めた定着保障温度範囲Ａをグラフに表わす。前記
通常制御温度範囲ＢはｂＱの制御温度でコントロールし
た場合に、実際の測定温度のばらつく範囲が制御下限温
度ｂ１と制御上限温度ｂ２により示されている。In order to solve the above-mentioned problems, the present invention provides a fixing guarantee temperature range in addition to the above-mentioned normal control temperature range, and sets the warming-up end temperature of the fixing device as follows. FIG. 1 shows the relationship between the two, and also shows the temperature control state during warming up and driving of the fixing device. That is, the vertical axis shows temperature C and the horizontal axis shows time t, along with a normal control temperature range B, a guaranteed lower limit temperature a1 at which toner images can be fixed, and a guaranteed upper limit temperature at which fixing can be performed without adversely affecting the recording paper 3 or the image to be fixed. The fixing guarantee temperature range A defined by a2 is shown in a graph. When the normal control temperature range B is controlled at the control temperature bQ, the range in which the actual measured temperature varies is shown by the control lower limit temperature b1 and the control upper limit temperature b2.
【００１２】前記定着保障温度範囲Ａは前記通常制御温
度範囲Ｂに較べその温度範囲が広く機種によって異るが
例えば該通常制御温度範囲Ｂが１６０℃±２℃であるの
に対し該定着保障温度範囲Ａは１６０℃±７℃と約３倍
以上広くなっている。そして、前記定着器５のウォーミ
ングアップ終了温度を前記定着保障温度Ａの前記保障下
限温度ａ１（１６０℃−７℃）に設定する。このように
して前記定着器５のウォーミングアップ終了温度が設定
された前記画像形成装置１の電源が投入され該定着器５
のウォーミングアップが開始されると電源投入前の前記
定着ローラ対６の表面温度Ｓ（環境温度）を起点として
時間の経過と共に該定着ローラ対６の表面温度は図のよ
うなカーブで上昇する。そして前記保障下限温度ａ１と
の交点Ｐに達するとウォーミングアップが終了し前記画
像形成装置１は他の機構部と共に駆動のための準備が完
了する。前記定着器５は前述のようにしてウォーミング
アップが終了すると前記ヒータ７の電源が切られるが前
記定着ローラ対６の表面温度は前記ローラ６の予熱によ
り更に上昇し続け図に示すような比較的なだらかなカー
ブで前記制御範囲の中央温度ｂＱとの交点Ｑに達したの
ち前記通常制御温度範囲Ｂの温度内でコントロールされ
る。The guaranteed fixing temperature range A has a wider temperature range than the normal control temperature range B and varies depending on the model, but for example, the normal control temperature range B is 160° C.±2° C., while the guaranteed fixing temperature range Range A is 160°C±7°C, which is about three times wider. Then, the warming-up end temperature of the fixing device 5 is set to the guaranteed lower limit temperature a1 (160° C.-7° C.) of the guaranteed fixing temperature A. The power of the image forming apparatus 1, in which the warming-up end temperature of the fixing device 5 has been set in this manner, is turned on, and the fixing device 5 is turned on.
When warming-up is started, the surface temperature of the fixing roller pair 6 starts from the surface temperature S (environmental temperature) of the fixing roller pair 6 before the power is turned on, and as time passes, the surface temperature of the fixing roller pair 6 increases according to a curve as shown in the figure. When the intersection point P with the guaranteed lower limit temperature a1 is reached, the warming-up is completed and the image forming apparatus 1 and other mechanical parts are ready for operation. When the fixing device 5 is warmed up as described above, the power to the heater 7 is turned off, but the surface temperature of the pair of fixing rollers 6 continues to rise due to the preheating of the rollers 6 and reaches a relatively gentle temperature as shown in the figure. After reaching the intersection point Q with the center temperature bQ of the control range with a curve such as that shown in FIG.
【００１３】従って、図から明らかなように従来、前記
制御範囲の中央温度ｂＱとの交点Ｑの位置でウォーミン
グアップを終了していた時間６〜７分に比してその時間
が３〜４分となり大幅にウォーミングアップ時間が短縮
されるばかりでなく前述したような前記定着ローラ対６
の表面温度がオーバーシュートすることもない。Therefore, as is clear from the figure, compared to the conventional time of 6 to 7 minutes for warming up at the intersection point Q with the center temperature bQ of the control range, the time is now 3 to 4 minutes. Not only is the warm-up time significantly shortened, but also the fixing roller pair 6 as described above
There is no overshoot of the surface temperature.
【００１４】そして、前記通常制御温度範囲Ａ内に達し
た前記定着ローラ対６の表面温度は環境温度や前記記録
紙３の定着量等によって変動するので例えば適宜な位置
に設けられたセンサ（図示せず）によって常時検出し定
められた前記通常制御温度範囲Ｂ内に保たれるようにコ
ントロールして常に確実、美麗な定着が行われるように
している。Since the surface temperature of the pair of fixing rollers 6 that has reached the normal control temperature range A varies depending on the environmental temperature, the amount of fixation of the recording paper 3, etc., a sensor (see FIG. (not shown) is constantly detected and controlled to be maintained within the predetermined normal control temperature range B, so that reliable and beautiful fixing is always performed.
【００１５】なお、前述した前記定着器５それぞれの温
度制御は前記定着ローラ対６の表面温度センサとあらか
じめ記憶されたＣＰＵとによって制御されている。The temperature control of each of the fixing devices 5 described above is controlled by a surface temperature sensor of the pair of fixing rollers 6 and a CPU stored in advance.
【００１６】[0016]
【発明の効果】本発明による定着器のウォーミングアッ
プ終了温度の設定によって画像形成装置のウォーミング
アップ時間が大幅に短縮することができた。Effects of the Invention By setting the warming-up end temperature of the fixing device according to the present invention, the warming-up time of the image forming apparatus can be significantly shortened.
図１は本発明の１実施例による定着器の定着保障温度範
囲と通常制御温度範囲との関係を示しそのウォーミング
アップ状態と駆動時のコントロール状態とを表わすグラ
フ。図２は画像形成装置に配設される定着器の位置と構
成とを示す概略図。FIG. 1 is a graph showing the relationship between the fixing guarantee temperature range and the normal control temperature range of a fixing device according to an embodiment of the present invention, and showing the warm-up state and the control state during driving. FIG. 2 is a schematic diagram showing the position and configuration of a fixing device installed in an image forming apparatus.
１…画像形成装置
２…感光体３…記録紙
５…定着器６…
定着ローラ
７…ヒータＡ…定着保障温度範囲
ａ１…保障下限温度
Ｂ…通常制御温度範囲
ｂ１…制御下限温度
ｂＱ…制御中央温度1...Image forming device
2...Photoreceptor 3...Recording paper
5...Fuser 6...
Fuser roller
7...Heater A...Guaranteed fixing temperature range
a1...Guaranteed lower limit temperature B...Normal control temperature range
b1...Control lower limit temperature bQ...Control center temperature
Claims (1)
着する画像形成装置の定着器において、一対の定着ロー
ラと該定着ローラを加熱するヒータとを有する前記定着
器のウォーミングアップ終了温度を前記トナー画像が前
記記録紙に定着可能な定着保障温度範囲の保障下限温度
に設定したことを特徴とする定着器の温度制御装置。1. In a fixing device of an image forming apparatus that fixes a toner image formed on a recording paper, the warming-up end temperature of the fixing device, which has a pair of fixing rollers and a heater that heats the fixing roller, is determined from the temperature of the toner image formed on the toner image. is set to a guaranteed lower limit temperature of a guaranteed fixing temperature range that allows fixing to the recording paper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP162791A JPH04250484A (en) | 1991-01-10 | 1991-01-10 | Temperature controller for fixing unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP162791A JPH04250484A (en) | 1991-01-10 | 1991-01-10 | Temperature controller for fixing unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04250484A true JPH04250484A (en) | 1992-09-07 |
Family
ID=11506777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP162791A Pending JPH04250484A (en) | 1991-01-10 | 1991-01-10 | Temperature controller for fixing unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04250484A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0905582A2 (en) * | 1997-09-24 | 1999-03-31 | Brother Kogyo Kabushiki Kaisha | Fixing unit for use in image forming device |
| US6308022B1 (en) | 1999-07-12 | 2001-10-23 | Murata Kikai Kabushiki Kaisha | Image forming apparatus and warming up method |
| US6453131B1 (en) | 1999-07-19 | 2002-09-17 | Murata Kikai Kabushiki Kaisha | Image forming apparatus and warm-up method |
| JP2008015419A (en) * | 2006-07-10 | 2008-01-24 | Canon Inc | Image forming apparatus |
-
1991
- 1991-01-10 JP JP162791A patent/JPH04250484A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0905582A2 (en) * | 1997-09-24 | 1999-03-31 | Brother Kogyo Kabushiki Kaisha | Fixing unit for use in image forming device |
| EP0905582A3 (en) * | 1997-09-24 | 2000-03-29 | Brother Kogyo Kabushiki Kaisha | Fixing unit for use in image forming device |
| US6097006A (en) * | 1997-09-24 | 2000-08-01 | Brother Kogyo Kabushiki Kaisha | Fixing unit for use in image forming device |
| US6308022B1 (en) | 1999-07-12 | 2001-10-23 | Murata Kikai Kabushiki Kaisha | Image forming apparatus and warming up method |
| US6453131B1 (en) | 1999-07-19 | 2002-09-17 | Murata Kikai Kabushiki Kaisha | Image forming apparatus and warm-up method |
| JP2008015419A (en) * | 2006-07-10 | 2008-01-24 | Canon Inc | Image forming apparatus |
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