JP3121975B2 - Fixing device - Google Patents
Fixing deviceInfo
- Publication number
- JP3121975B2 JP3121975B2 JP32542793A JP32542793A JP3121975B2 JP 3121975 B2 JP3121975 B2 JP 3121975B2 JP 32542793 A JP32542793 A JP 32542793A JP 32542793 A JP32542793 A JP 32542793A JP 3121975 B2 JP3121975 B2 JP 3121975B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- heater
- heaters
- failure
- fixing roller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Fixing For Electrophotography (AREA)
- Control Of Resistance Heating (AREA)
- Control Of Temperature (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えばレーザビームプ
リンタ等に用いられている定着装置に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device used in, for example, a laser beam printer.
【０００２】[0002]
【従来の技術】従来、電子写真装置などの画像形成装置
の熱ローラ方式による定着器において、定着器にいかな
る大きさの紙が給紙されても、定着ローラの温度が全て
の場所において、一定であるようにするため、複数の配
光特性の違うヒータを使用するものがある（例えば特開
平４−１６８４６８号）。2. Description of the Related Art Conventionally, in a fixing device of a heat roller type in an image forming apparatus such as an electrophotographic apparatus, the temperature of the fixing roller is constant at all places regardless of the size of paper fed to the fixing device. In some cases, a plurality of heaters having different light distribution characteristics are used (for example, Japanese Patent Application Laid-Open No. 4-168468).
【０００３】このような先行例である故障検知装置にあ
っては、定着器温度制御で、サーミスタ温度がある一定
時間で基準温度に達しなければ故障と判断するものであ
る。In such a failure detection device as a prior example, if the thermistor temperature does not reach a reference temperature within a certain period of time in the fixing device temperature control, it is determined that a failure has occurred.
【０００４】[0004]
【発明が解決しようとする課題】ところが、このような
先行例である故障検知装置にあっては、複数の配光特性
の違うヒータを使うことによって定着ローラの温度を一
定に保つ働きをするものであるため、例えばどれか一つ
のヒータが故障した場合に、他のヒータで温度検出用サ
ーミスタが熱せられているため、故障したヒータに気づ
くことがなく定着不良のまま定着を継続してしまう場合
があり、定着不良のシートが生じるという問題点があっ
た。本出願に係る発明の目的は、精度の高い故障検知が
行なえる定着装置を提供しようとするものである。 However, in such a failure detection apparatus as a prior example, a function of maintaining the temperature of the fixing roller constant by using a plurality of heaters having different light distribution characteristics is used. Therefore, for example, when one of the heaters fails, the temperature detection thermistor is heated by another heater, so that the fixing is continued without fixing the defective heater without noticing the failed heater. Therefore, there is a problem that a sheet having poor fixing is generated. The purpose of the invention according to the present application is to provide highly accurate failure detection.
It is intended to provide a fixing device that can be used.
【０００５】[0005]
【課題を解決するための手段】本出願に係る発明は、通
電により発熱する第１及び第２のヒータと 、 これらのヒ
ータにより加熱される定着ローラと 、 定着ローラの温度
を検知する温度検知素子と、温度検知素子の検知温度に
基づきヒータの故障を判断する故障検知手段と 、 を有す
る定着装置において 、 上記故障検知手段は上記第１のヒ
ータへ通電しその時の上記温度検知素子の検知温度の上
昇率を検知し、上記第１のヒータへの通電を遮断して上
記定着ローラの温度が降下した後に上記第２のヒータへ
通電して上記温度検知素子の検知温度の上昇率を検知す
ることを特徴とする。Means for Solving the Problems The invention according to the present application is disclosed in
First and second heater for generating heat by electricity, these human
A fixing roller heated by chromatography data, the temperature of the fixing roller
Temperature detection element to detect the temperature and the temperature detected by the temperature detection element
Yusuke a failure detecting means for determining a failure of the heater based on the
In the fixing device according to the first aspect of the present invention, the failure detecting means includes
The temperature of the temperature sensor at that time.
The rising rate is detected, and the power supply to the first heater is cut off to
After the temperature of the fixing roller has dropped,
Energize to detect the rate of rise in the temperature detected by the temperature sensor.
It is characterized by that .
【０００６】[0006]
【０００７】[0007]
【実施例】以下に本発明を図面に示す実施例に基いてそ
の構造を詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below in detail with reference to the embodiments shown in the drawings.
【０００８】図１は、電子写真方式のプリンタの定着器
の構成図である。以下、図１に基づいて説明する。なお
定着器に設備するヒータの個数は、実際には、複数のヒ
ータでもいいが、説明を判りやすくするために２つのヒ
ータを用いた場合について説明する。FIG. 1 is a configuration diagram of a fixing device of an electrophotographic printer. Hereinafter, description will be given based on FIG. Note that the number of heaters provided in the fixing device may actually be a plurality of heaters, but a case where two heaters are used will be described for easy understanding.
【０００９】図１において、円筒状の定着ローラ８の内
部に２本のヒータ９，１０が配置されており、これらヒ
ータ９，１０は各々のＡＣ電源１１に接続されている。
また、これらのヒータ９，１０は各々のトライアック
６，７と直列に接続されており、トライアック６，７
は、ＣＰＵ２に制御された通電制御信号４，５によって
オン／オフされヒータ９，１０への通電を断続的に行な
うようにしている。さらに、定着ローラ８に近接配置さ
れているサーミスタ１は、定着ローラ８の温度を検出す
るものであり、ＣＰＵ２は、サーミスタ１の出力である
温度信号３により定着ローラの温度を検出し、出力ポー
トより通電信号４，５によってトライアック６，７をオ
ン／オフし、ヒータ９，１０に通電制御し定着器の温度
制御を行うものである。温度制御は、予め設定された基
準温度と、サーミスタ１からの温度信号３より得られる
温度を比較し、その温度が基準温度より高ければ通電制
御信号４，５によってトライアック６，７をオフし、ヒ
ータ９，１０への通電を切り、低ければ通電制御信号
４，５によってトライアック６，７をオンし、ヒータ
９，１０へ通電する。In FIG. 1, two heaters 9 and 10 are arranged inside a cylindrical fixing roller 8, and these heaters 9 and 10 are connected to respective AC power supplies 11.
The heaters 9 and 10 are connected in series with the respective triacs 6 and 7, and the triacs 6 and 7 are connected in series.
Are turned on / off by energization control signals 4 and 5 controlled by the CPU 2 so as to intermittently energize the heaters 9 and 10. Further, the thermistor 1 disposed in proximity to the fixing roller 8 detects the temperature of the fixing roller 8, and the CPU 2 detects the temperature of the fixing roller based on the temperature signal 3 output from the thermistor 1, and outputs the output port. The triacs 6 and 7 are turned on / off by the energization signals 4 and 5, and the energization of the heaters 9 and 10 is controlled to control the temperature of the fixing device. The temperature control compares a preset reference temperature with a temperature obtained from the temperature signal 3 from the thermistor 1, and if the temperature is higher than the reference temperature, turns off the triacs 6, 7 by the energization control signals 4, 5; The power to the heaters 9 and 10 is turned off. If the power is low, the triacs 6 and 7 are turned on by the power control signals 4 and 5 to energize the heaters 9 and 10.
【００１０】以上が本実施例の構成であり、次にその作
用について述べるが先ず制御手順の第１実施例を図２、
図３を基にして説明する。The above is the configuration of this embodiment. Next, the operation will be described. First, the first embodiment of the control procedure will be described with reference to FIG.
This will be described with reference to FIG.
【００１１】図２は、第１実施例にて故障検知を行う場
合のサーミスタ検知温度の時間的変化を示す図、図３は
その第１実施例のＣＰＵ２の制御手順を示すフローチャ
ートである。FIG. 2 is a diagram showing a change over time of the thermistor detection temperature when a failure is detected in the first embodiment, and FIG. 3 is a flowchart showing a control procedure of the CPU 2 of the first embodiment.
【００１２】なお本第１実施例はパワーオン直後にヒー
タ故障チェックを行う制御手順である。The first embodiment is a control procedure for checking a heater failure immediately after power-on.
【００１３】パワーオン後、ステップ２０でヒータ９の
みをオンし、ステップ２１でＣＰＵ２内のタイマー１を
スタートさせる。ヒータ９が正常であれば図２のごとく
定着ローラ表面温度は上昇する。After the power is turned on, only the heater 9 is turned on in step 20, and the timer 1 in the CPU 2 is started in step 21. If the heater 9 is normal, the fixing roller surface temperature rises as shown in FIG.
【００１４】ステップ２２で時間ｔ1 を待ち合わせた
後、ステップ２３でその時の定着ローラ表面温度Ｔ1 が
一定レベルＡを越えているかどうかを確認し越えていな
ければヒータ９の断線等の故障があったと判断する。After waiting for time t 1 in step 22, it is checked in step 23 whether or not the fixing roller surface temperature T 1 at that time exceeds a certain level A. If not, there is a failure such as disconnection of the heater 9. Judge that
【００１５】越えていればステップ２４でヒータ９をオ
フし、ヒータ１０のチェックに入る。If so, the heater 9 is turned off in step 24, and the heater 10 is checked.
【００１６】ステップ２５でその時の定着ローラ温度Ｔ
2 をＲＡＭにメモリし、ステップ２６でヒータ１０をオ
ンし、ステップ２７でタイマー２をスタートさせる。In step 25, the fixing roller temperature T at that time
2 is stored in the RAM, the heater 10 is turned on in step 26, and the timer 2 is started in step 27.
【００１７】ステップ２８で時間ｔ2 の待ち合わせを行
い、時間ｔ2 が経過したらその時の定着ローラ温度Ｔ3
を検知し、ステップ２９でＴ3 −Ｔ2 が一定レベルＢを
越えているかを判断し、越えてなければ故障と判断し越
えていれば正常と判断しステップ３０でヒータ１０をオ
フし通常の温度制御動作を開始する。[0017] carried out the waiting time t 2 at step 28, the fixing of that time after a lapse of time t 2 roller temperature T 3
Is detected at step 29 to determine whether T 3 -T 2 exceeds a predetermined level B. If not, it is determined that a failure has occurred. If it has exceeded, it is determined that the temperature is normal. Start the temperature control operation.
【００１８】以上のようにしてパワーオン時に２本のヒ
ータ９，１０が正常であるか否かを判断してから通常の
動作を開始することができる。As described above, the normal operation can be started after judging whether or not the two heaters 9 and 10 are normal at the time of power-on.
【００１９】なおフローチャートには示していないが判
断をする時は必ずダブルチェック等を行い誤動作を防止
する。Although not shown in the flow chart, when making a judgment, a double check or the like is always performed to prevent malfunction.
【００２０】図４、図５は制御手順第２実施例を示す。
この第２の実施例は、定着器がすでに熱せられている場
合を示す。つまり定着器がすでに熱せられている時にヒ
ータのテストを行うと、オーバヒートを超こす可能性が
ある。そこで本実施例では一本目のヒータのテストが終
ったら定着器を冷やしてから二本目のヒータのテストを
行うものである。まずステップ３１でヒータ９をオンし
ステップ３２でタイマー１をスタートさせる。FIGS. 4 and 5 show a second embodiment of the control procedure.
This second embodiment shows a case where the fixing device has already been heated. That is, if the heater is tested while the fixing device is already heated, overheating may occur. Therefore, in this embodiment, after the test of the first heater is completed, the fixing device is cooled, and then the test of the second heater is performed. First, at step 31, the heater 9 is turned on, and at step 32, the timer 1 is started.
【００２１】次いでステップ３３で時間ｔ1 の待合わせ
をした後その時の温度Ｔ1 が一定レベルＡ以上あるかど
うかを判断する。そして一定レベルを越えてなければ故
障と判断する。越えていれば正常と判断し、ステップ３
５でヒータ９をオフし、ステップ３６でローラ表面温度
がテスト開始温度Ｔ0 まで下がるのを待つ。Next, after waiting for the time t 1 in step 33, it is determined whether or not the temperature T 1 at that time is equal to or higher than a certain level A. If it does not exceed a certain level, it is determined that a failure has occurred. If it exceeds, judge that it is normal and step 3
Off the heater 9 at 5, the roller surface temperature waits for drop to the test starting temperature T 0 in step 36.
【００２２】温度がＴ0 まで下がったら、ステップ３７
でヒータ１０をオンし、ステップ３８でタイマー２をス
タートさせ、ステップ３９で時間ｔ2 が経過するのを待
つ。ｔ2 経過時点で、ステップ４０で温度Ｔ1 が一定レ
ベルＢを越えているか調べ、越えていなければ故障と判
断する。越えていれば正常と判断しヒータ１０をオフし
通常の温度制御を開始する。If the temperature has dropped to T 0 , step 37
In turns on the heater 10, the timer 2 is started at step 38, waits for the time t 2 has elapsed at step 39. t 2 upon elapse, checks whether the temperature T 1 is exceeds the predetermined level B at step 40, it is determined that a failure if not exceeded. If it exceeds, it is determined that it is normal, and the heater 10 is turned off to start normal temperature control.
【００２３】[0023]
【発明の効果】本発明によれば、第１のヒータの故障検
知の際の第１のヒータの加熱による定着ローラの温度上
昇分がなくなった後第２のヒータの故障検知を行うの
で、精度の高い故障検知を行える。 According to the present invention, the failure detection of the first heater is performed.
The temperature of the fixing roller due to the heating of the first heater when the
Detecting the failure of the second heater after the rising has stopped
Thus, highly accurate failure detection can be performed.
【００２４】[0024]
【図１】本発明実施例の電子写真方式のプリンタの定着
器の構成図。FIG. 1 is a configuration diagram of a fixing device of an electrophotographic printer according to an embodiment of the present invention.
【図２】ヒータのチェック時の時間とローラ表面温度と
の関係を示す第１の実施例。FIG. 2 is a first embodiment illustrating a relationship between a time when a heater is checked and a roller surface temperature.
【図３】第１の実施例の手順を示すフローチャート。FIG. 3 is a flowchart illustrating a procedure according to the first embodiment;
【図４】第２の実施例の時間とローラ表面温度の関係を
示した特性図。FIG. 4 is a characteristic diagram showing a relationship between time and roller surface temperature in the second embodiment.
【図５】第２の実施例の手順を示すフローチャート。FIG. 5 is a flowchart illustrating a procedure according to a second embodiment.
１…サーミスタ ２…ＣＰＵ ３…温度信号 ４，５…通電制
御信号 ６，７…トライアック ８…定着ローラ ９，１０…ヒータ １１…ＡＣ電源 Ｒ…抵抗DESCRIPTION OF SYMBOLS 1 ... Thermistor 2 ... CPU 3 ... Temperature signal 4, 5 ... Energization control signal 6, 7 ... Triac 8 ... Fixing roller 9, 10 ... Heater 11 ... AC power supply R ... Resistance
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平４−168468（ＪＰ，Ａ) 特開 昭61−156079（ＪＰ，Ａ) 特開 昭62−20681（ＪＰ，Ａ) 特開 平１−93083（ＪＰ，Ａ) 特開 昭61−53462（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G03G 13/20 G03G 15/20 H05B 1/00 - 3/00 375 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-168468 (JP, A) JP-A-61-156079 (JP, A) JP-A-62-20681 (JP, A) 93083 (JP, A) JP-A-61-53462 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) G03G 13/20 G03G 15/20 H05B 1/00-3/00 375
Claims (1)
タと 、 これらのヒータにより加熱される定着ローラと 、
定着ローラの温度を検知する温度検知素子と、温度検知
素子の検知温度に基づきヒータの故障を判断する故障検
知手段と 、 を有する定着装置において 、 上記故障検知手段は上記第１のヒータへ通電しその時の
上記温度検知素子の検知温度の上昇率を検知し、上記第
１のヒータへの通電を遮断して上記定着ローラの温度が
降下した後に上記第２のヒータへ通電して上記温度検知
素子の検知温度の上昇率を検知することを特徴とする定
着装置 。(1)First and second heaters that generate heat when energized
And , The fixing roller heated by these heaters ,
Temperature detection element that detects the temperature of the fixing roller and temperature detection
Failure detection to determine heater failure based on the detected temperature of the element
With intelligence , Fixing device having , The failure detecting means supplies power to the first heater and supplies the current at that time.
Detecting the rate of increase in the temperature detected by the temperature detecting element,
(1) The power supply to the heater is interrupted to reduce the temperature of the fixing roller.
After falling, the second heater is energized to detect the temperature.
Detecting the rise rate of the temperature detected by the element
Dressing equipment .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32542793A JP3121975B2 (en) | 1993-12-22 | 1993-12-22 | Fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32542793A JP3121975B2 (en) | 1993-12-22 | 1993-12-22 | Fixing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07181832A JPH07181832A (en) | 1995-07-21 |
| JP3121975B2 true JP3121975B2 (en) | 2001-01-09 |
Family
ID=18176739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32542793A Expired - Fee Related JP3121975B2 (en) | 1993-12-22 | 1993-12-22 | Fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3121975B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6965741B2 (en) | 2002-03-27 | 2005-11-15 | Brother Kogyo Kabushiki Kaisha | Thermal fixing device with heater operation diagnosing function |
| US7187880B2 (en) | 2002-03-29 | 2007-03-06 | Brother Kogyo Kabushiki Kaisha | Thermal fixing device and image forming apparatus using the same |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5819134A (en) * | 1995-06-30 | 1998-10-06 | Canon Kabushiki Kaisha | Fixing apparatus having a temperature control system for a plurality of heaters |
| US7826759B2 (en) * | 2006-01-24 | 2010-11-02 | Samsung Electronics Co., Ltd. | Power control method and apparatus to heat a heating roller |
-
1993
- 1993-12-22 JP JP32542793A patent/JP3121975B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6965741B2 (en) | 2002-03-27 | 2005-11-15 | Brother Kogyo Kabushiki Kaisha | Thermal fixing device with heater operation diagnosing function |
| US7187880B2 (en) | 2002-03-29 | 2007-03-06 | Brother Kogyo Kabushiki Kaisha | Thermal fixing device and image forming apparatus using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07181832A (en) | 1995-07-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |