JP2964266B2 - Fixing temperature control device - Google Patents
Fixing temperature control deviceInfo
- Publication number
- JP2964266B2 JP2964266B2 JP2234503A JP23450390A JP2964266B2 JP 2964266 B2 JP2964266 B2 JP 2964266B2 JP 2234503 A JP2234503 A JP 2234503A JP 23450390 A JP23450390 A JP 23450390A JP 2964266 B2 JP2964266 B2 JP 2964266B2
- Authority
- JP
- Japan
- Prior art keywords
- heater
- heating roller
- temperature
- heating
- fixing temperature
- 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 Or Security For Electrophotography (AREA)
- Control Of Temperature (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明はプリンタ，ファクシミリ，複写機等の画像形
成装置における加熱定着部の定着温度制御装置に関す
る。Description: BACKGROUND OF THE INVENTION The present invention relates to a fixing temperature control device for a heat fixing unit in an image forming apparatus such as a printer, a facsimile, and a copying machine.
（従来の技術） 上記画像形成装置における加熱定着部は、第４図にそ
の概要構成図を示すように内部に加熱ヒータ２を有する
加熱ローラ１と、該加熱ローラに対し所定の圧力で回転
接触する加圧ローラ３とでなり、該加熱ローラの表面温
度を検知する温度検知素子（例えば、サーミスタ）４
と、安全のための温度ヒューズ５と、用紙６の巻付きを
防止するための用紙分離爪７等が配設されている。そし
て、加熱ローラ１の温度が異常上昇時、ヒューズ断とな
り、前記加熱ヒータへの電流供給を遮断するようになっ
ている。(Prior Art) As shown in FIG. 4, the heat fixing section of the image forming apparatus has a heating roller 1 having a heating heater 2 therein and a rotating contact with the heating roller at a predetermined pressure. Temperature detecting element (for example, a thermistor) 4 for detecting the surface temperature of the heating roller.
And a thermal fuse 5 for safety, a paper separating claw 7 for preventing the paper 6 from being wound, and the like. When the temperature of the heating roller 1 rises abnormally, the fuse is blown and the current supply to the heater is cut off.
（発明が解決しようとする課題） 上記加熱定着部において加熱ヒータ２の動作制御回路
に異常が起きた場合、例えば、加熱ヒータ２の回転オン
・オフ制御用のトライアックの故障により、制御部のマ
イクロコンピュータ（CPU）からの信号による加熱ヒー
タの制御が不能になり、該加熱ヒータをオフ状態にした
にも拘らず、オン状態（点灯）になることがある。(Problem to be Solved by the Invention) When an abnormality occurs in the operation control circuit of the heater 2 in the heating and fixing unit, for example, a failure of a triac for controlling the rotation on / off of the heater 2 causes a failure of the micro unit of the control unit. Control of the heater by a signal from the computer (CPU) becomes impossible, and the heater may be turned on (lit) in spite of turning off the heater.
この場合、前記温度ヒューズ５は即座に熔断しないた
め、加熱ローラ１の表面温度が異常に高温度にならない
と、前記温度ヒューズ５が熔断して、加熱ヒータ２への
電流供給を遮断しない。この結果、加熱ローラ１付近の
部品、例えば前記用紙分離爪７が熱障害のため破損して
しまうという問題があった。In this case, since the thermal fuse 5 does not blow immediately, unless the surface temperature of the heating roller 1 becomes abnormally high, the thermal fuse 5 melts and does not interrupt the current supply to the heater 2. As a result, there is a problem that components near the heating roller 1, for example, the paper separating claw 7 are damaged due to a heat failure.
本発明はこのような問題を解決し、温度ヒューズなど
の安全手段が動作するまで、加熱ローラの表面温度をで
きるだけ異常温度にならないようにして、加熱ローラ付
近に配設されている部品を熱による劣化、破損を防ぐこ
とを目的とする。The present invention solves such a problem, and prevents the surface temperature of the heating roller from becoming an abnormal temperature as much as possible until a safety means such as a thermal fuse operates, and heats components disposed near the heating roller. The purpose is to prevent deterioration and damage.
（課題を解決するための手段） 本発明は上記課題を解決し目的を達成するため加熱定
着部の定着温度を検出する定着温度検出手段と、該定着
温度検出手段による検出温度と予め定められたローラ定
着温度との比較により加熱定着部の加熱ローラに対する
加熱ヒータの動作をオン・オフ制御する制御手段と、前
記加熱ローラの回転をオン・オフ制御する回転制御手段
及び加熱ヒータの安全手段を備え、前記加熱ヒータに対
する制御手段により加熱ヒータの動作をオフ状態にした
にも拘らず前記ローラ定着温度より著しく高温に加熱ロ
ーラの温度が検出された場合、ヒータ異常とし、少なく
とも前記安全手段が動作するまでの間、前記回転制御手
段により前記加熱ローラを回転させることを特徴とす
る。(Means for Solving the Problems) In order to solve the above problems and achieve the object, the present invention provides a fixing temperature detecting means for detecting a fixing temperature of a heating fixing unit, and a temperature detected by the fixing temperature detecting means. Control means for on / off control of the operation of the heater with respect to the heating roller of the heating / fixing unit based on comparison with the roller fixing temperature, rotation control means for on / off controlling the rotation of the heating roller, and safety means for the heater. If the temperature of the heating roller is detected to be significantly higher than the roller fixing temperature even though the operation of the heating heater is turned off by the control means for the heating heater, it is determined that the heater is abnormal and at least the safety means operates. In the meantime, the heating roller is rotated by the rotation control means.
（作 用） 本発明は加熱ローラの加熱ヒータを制御手段によりオ
フ状態にしたにも拘らず何等かの原因で通常の設定定着
ローラ温度より著しく高温に検出された場合、安全手段
が動作するまで、加熱ローラを回転駆動して該加熱ロー
ラの表面温度が上昇しないようにして、加熱ヒータへの
電流供給を遮断し、その後において加熱ローラの回転を
停止させ、加熱ローラ周辺の部分の熱による劣化、破損
を防止する。(Operation) In the present invention, even when the heater of the heating roller is turned off by the control means, if the temperature is detected to be significantly higher than the normal set fixing roller temperature for some reason, the safety means is activated. Then, the heating roller is driven to rotate so that the surface temperature of the heating roller does not rise, the current supply to the heating heater is interrupted, and then the rotation of the heating roller is stopped. Prevent damage.
（実施例） 第１図は本発明の一実施例による構成図を示し、８は
加熱ローラ１を回転させるDCモータ、９は該加熱ローラ
の回転駆動回路、２は加熱ローラ１に内蔵の加熱ヒー
タ、10は該加熱ヒータの安全装置で、ここでは、一例と
して温度ヒューズを用いる。11は前記加熱ヒータ２の駆
動回路、12は前記ヒータの温度検知回路で、ここではサ
ーミスタ４が用いられる。13は制御部で、マイクロコン
ピュータ（CPU）で構成され、前記ヒータ温度検知回路1
2からの加熱ローラ１の表面温度に基づき加熱ローラの
回転駆動回路９、ヒータ駆動回路11を制御し、DCモータ
８や加熱ヒータ２のオン・オフ制御を行う。(Embodiment) FIG. 1 shows a configuration diagram according to an embodiment of the present invention, in which 8 is a DC motor for rotating the heating roller 1, 9 is a rotation drive circuit of the heating roller, and 2 is a heating built in the heating roller 1. The heater 10 is a safety device for the heater. Here, a thermal fuse is used as an example. Numeral 11 denotes a driving circuit of the heater 2 and numeral 12 denotes a temperature detecting circuit of the heater, in which a thermistor 4 is used. Reference numeral 13 denotes a control unit, which is configured by a microcomputer (CPU), and includes the heater temperature detection circuit 1
On / off control of the DC motor 8 and the heater 2 is performed by controlling the heating roller rotation driving circuit 9 and the heater driving circuit 11 based on the surface temperature of the heating roller 1 from 2.
次に本実施例の動作を第２図のヒータエラー検出部分
のフローチャート及び第３図の温度ヒューズ10の動作点
を図により説明する。Next, the operation of the present embodiment will be described with reference to the flowchart of the heater error detecting portion in FIG. 2 and the operating point of the thermal fuse 10 in FIG.
第２図に示すように画像形成装置の電源オン（S1）と
ともに加熱ローラ内の加熱ヒータ２へヒータ駆動回路11
を介してCPU13からのオン信号で加熱ヒータに電流が供
給される。そして、通常のヒータ制御ではCPU13により
予め定められた温度以下なら点灯させ、温度以上ならCP
U13からのオフ信号で消灯する繰返し制御がヒータ駆動
回路11を介して行われる。As shown in FIG. 2, when the power of the image forming apparatus is turned on (S 1 ), a heater driving circuit 11 is connected to the heater 2 in the heating roller.
A current is supplied to the heater by an ON signal from the CPU 13 via the CPU. Then, in normal heater control, if the temperature is lower than the temperature predetermined by the CPU 13, the lamp is turned on.
The repetitive control of turning off the light in response to the off signal from U13 is performed via the heater drive circuit 11.
ところで、CPU13でオフ信号を出力したにも拘らず前
記設定温度より加熱ローラの表面温度が異常に高温にな
った場合（S2のYES）、CPU13はヒータエラー表示し
（S3）、ついで、加熱ローラの回転駆動回路９へDCモー
タ８を回転駆動するオン信号を出力する（S4）。このDC
モータ８の回転により加熱ローラ１は回転駆動され、こ
の回転時間は、安全装置10の温度ヒューズが充分働くま
での時間t2以上回転させる（S5）。Incidentally, when the surface temperature of the heating roller than the set temperature despite outputs an OFF signal in CPU 13 is unusual temperature (YES in S 2), CPU 13 displays heater error (S 3), then, outputs an oN signal for rotating the DC motor 8 to rotate the driving circuit 9 of the heating roller (S 4). This DC
Heating roller 1 by the rotation of the motor 8 is rotated, the rotation time rotates the time t 2 or more to a temperature fuse of the safety device 10 acts sufficiently (S 5).
この加熱ローラ１の回転により、該加熱ローラ周辺の
熱が拡散されるため、例えば、第３図の温度曲線Ａ（実
線図示）に示すように緩やかになり加熱ローラ１と非接
触の温度ヒューズの雰囲気温度も徐々に温度曲線Ａと同
様に上昇していくが、加熱ローラの熱拡散が大きいた
め、従来のように加熱ローラ１を回転駆動させない時の
温度曲線Ｂよりも、温度ヒューズの動作点温度が、加熱
ローラの表面温度T2より低いT1の所で動作し、加熱ヒー
タ２がオフする。この時の動作時間は従来のt1よりも遅
れた時間t2となる。Since the heat around the heating roller 1 is diffused by the rotation of the heating roller 1, for example, as shown by a temperature curve A (shown by a solid line) in FIG. The ambient temperature also gradually rises in the same manner as the temperature curve A. However, since the thermal diffusion of the heating roller is large, the operating point of the temperature fuse is lower than the temperature curve B when the heating roller 1 is not driven to rotate as in the related art. temperature, operating at lower T 1 than the surface temperature T 2 of the heating roller, a heater 2 is turned off. The operating time of the time is the time t 2 which is delayed over conventional t 1.
したがって、従来のように加熱ローラの表面温度が高
いT2で加熱ヒータをオフするに比べて、本実施例では加
熱ローラの表面温度が低いT1で加熱ヒータ２がオフする
ため、用紙分離爪７の熱変形が防止できる。そして、加
熱ヒータ２がオフ後、CPU13はDCモータ８をオフとし
て、加熱ローラ１の回転をオフとする（S6）。Therefore, the surface temperature of the heating roller as in the prior art as compared to off heater with high T 2, for turning off the heater 2 is the surface temperature is low T 1 of the heating roller in the present embodiment, the sheet separating claw 7 can be prevented from being thermally deformed. Then, after heating the heater 2 is turned off, CPU 13 as off the DC motor 8, to turn off the rotation of the heating roller 1 (S 6).
（発明の効果） 以上説明したように本発明は、加熱定着部における安
全装置が働く加熱ローラの表面温度は、従来のように加
熱ローラが停止状態のままで安全装置が働く加熱ローラ
の表面温度よりも低下でき、その分、加熱ローラの周辺
部における熱による部品劣化、破損を防止できる。(Effects of the Invention) As described above, according to the present invention, the surface temperature of the heating roller at which the safety device operates in the heating and fixing unit is the surface temperature of the heating roller at which the safety device operates with the heating roller stopped as in the related art. Than that, it is possible to prevent component deterioration and breakage due to heat around the heating roller.
第１図は本発明の一実施例による構成図、第２図はヒー
タエラー検出部分のフローチャート、第３図は温度ヒュ
ーズの動作点を示す図、第４図は画像形成装置の加熱定
着部の概要構成を示す図である。 １……加熱ローラ、２……加熱ヒータ、４……サーミス
タ、５……温度ヒューズ、７……用紙分離爪、８……DC
モータ、９……加熱ローラの回転駆動回路、10……安全
装置（温度ヒューズ）、11……ヒータ駆動回路、12……
温度検知回路（サーミスタ４）、13……制御部のマイク
ロコンピュータ（CPU）。FIG. 1 is a configuration diagram according to an embodiment of the present invention, FIG. 2 is a flowchart of a heater error detecting portion, FIG. 3 is a diagram showing operating points of a thermal fuse, and FIG. It is a figure showing an outline composition. 1 ... heating roller, 2 ... heating heater, 4 ... thermistor, 5 ... temperature fuse, 7 ... paper separating claw, 8 ... DC
Motor 9 Rotating circuit of heating roller 10 Safety device (temperature fuse) 11 Heater circuit 12
Temperature detection circuit (thermistor 4), 13: microcomputer (CPU) of control unit.
Claims (1)
検出手段と、該定着温度検出手段による検出温度と予め
定められたローラ定着温度との比較により加熱定着部の
加熱ローラに対する加熱ヒータの動作をオン・オフ制御
する制御手段と、前記加熱ローラの回転をオン・オフ制
御する回転制御手段及び加熱ヒータの安全手段を備え、
前記加熱ヒータに対する制御手段により加熱ヒータの動
作をオフ状態にしたにも拘らず前記ローラ定着温度より
著しく高温に加熱ローラの温度が検出された場合、ヒー
タ異常とし、少なくとも前記安全手段が動作するまでの
間、前記回転制御手段により前記加熱ローラを回転させ
ることを特徴とする定着温度制御装置。A fixing temperature detecting means for detecting a fixing temperature of a heat fixing unit, and a heater for a heating roller of a heat fixing unit is compared with a temperature detected by the fixing temperature detecting means and a predetermined roller fixing temperature. Control means for on / off control of the operation, and a rotation control means for on / off control of the rotation of the heating roller and a safety means for the heater,
If the temperature of the heating roller is detected to be significantly higher than the roller fixing temperature even though the operation of the heating heater is turned off by the control means for the heating heater, it is determined that the heater is abnormal and at least until the safety means operates. Wherein the heating roller is rotated by the rotation control means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2234503A JP2964266B2 (en) | 1990-09-06 | 1990-09-06 | Fixing temperature control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2234503A JP2964266B2 (en) | 1990-09-06 | 1990-09-06 | Fixing temperature control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04115281A JPH04115281A (en) | 1992-04-16 |
| JP2964266B2 true JP2964266B2 (en) | 1999-10-18 |
Family
ID=16972051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2234503A Expired - Fee Related JP2964266B2 (en) | 1990-09-06 | 1990-09-06 | Fixing temperature control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2964266B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19543986A1 (en) | 1995-11-25 | 1997-05-28 | Behr Gmbh & Co | Heat exchanger and a method of manufacturing a heat exchanger |
| US6095239A (en) | 1996-08-12 | 2000-08-01 | Calsonic Kansei Corporation | Integral-type heat exchanger |
| JP4281175B2 (en) | 1999-09-29 | 2009-06-17 | 株式会社デンソー | Double heat exchanger |
-
1990
- 1990-09-06 JP JP2234503A patent/JP2964266B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04115281A (en) | 1992-04-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |