JPH0328444Y2 - - Google Patents
Info
- Publication number
- JPH0328444Y2 JPH0328444Y2 JP1984117552U JP11755284U JPH0328444Y2 JP H0328444 Y2 JPH0328444 Y2 JP H0328444Y2 JP 1984117552 U JP1984117552 U JP 1984117552U JP 11755284 U JP11755284 U JP 11755284U JP H0328444 Y2 JPH0328444 Y2 JP H0328444Y2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- heat
- power
- time
- heat fixing
- 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
Links
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 description 8
- 230000007613 environmental effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
Landscapes
- Fixing For Electrophotography (AREA)
- Control Of Resistance Heating (AREA)
- Control Of Temperature (AREA)
Description
【考案の詳細な説明】
本考案は、複写紙上のトナー像を熱定着する複
写機の熱定着装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat fixing device for a copying machine that heat fixes a toner image on copy paper.
このような複写機の熱定着装置では、高品質の
熱定着を行うことが望まれる。 In such a heat fixing device of a copying machine, it is desirable to perform high quality heat fixing.
本考案の目的は、高品質の熱定着を行なうこと
ができるようにした複写機の熱定着装置を提供す
ることがある。 An object of the present invention is to provide a heat fixing device for a copying machine that can perform high quality heat fixing.
本考案は、複写紙上のトナー像を、加熱源を備
えた熱定着手段によつて熱定着を行う複写機の熱
定着装置において、
前記熱定着手段の温度と検出する温度検出器
と、
前記温度検出器によつて検出される検出温度に
基づいて、前記加熱源への電力付勢を制御する制
御手段と、
前記加熱源への付勢電力遮断後に所定時間を計
数する計数手段とを含み、
前記制御手段は、計数手段による所定時間Ｗ２
を計数するまでに加熱源への電力付勢が開始され
ると、前記検出温度を熱定着に適した温度Ｔ２に
維持し、計数手段が前記所定時間Ｗ２を計数した
後に前記加熱源への電力付勢が開始されると、前
記検出温度を熱定着に適した温度Ｔ２を越える温
度Ｔ１に維持するように、前記加熱源への電力付
勢を制御することを特徴とする複写機の熱定着装
置である。 The present invention provides a thermal fixing device for a copying machine that thermally fixes a toner image on a copy paper by a thermal fixing means equipped with a heat source, comprising: a temperature detector for detecting the temperature of the thermal fixing means; and a temperature detector for detecting the temperature of the thermal fixing means; A control means for controlling power application to the heat source based on the detected temperature detected by the detector; and a counting means for counting a predetermined time after the power supply to the heat source is cut off. The control means controls the predetermined time W2 by the counting means.
If power application to the heat source is started before counting W2, the detected temperature is maintained at a temperature T2 suitable for heat fixing, and after the counting means has counted the predetermined time W2, power to the heat source is started. A thermal fixing device for a copying machine characterized in that, when energizing is started, energizing power to the heating source is controlled so as to maintain the detected temperature at a temperature T1 exceeding a temperature T2 suitable for thermal fixing. It is a device.
第１図は本考案の一実施例の簡略化した断面図
である。複写機の熱定着装置１には、原稿に対応
したトナー像が形成された複写機が矢符２の方向
に搬送されてくる。熱定着装置１は加熱源である
ヒータ３と、このヒータ３が挿通された熱ローラ
４と、熱ローラ４に平行でその熱ローラ４に接触
する圧ローラ５とから成る熱定着手段６を含む。
トナー像を有する複写機が熱ローラ４と圧ローラ
５との間を通過することによつて熱定着が行なわ
れる。熱ローラ４の表面の温度は、温度検出器と
してのサーミスタ７によつて検出される。 FIG. 1 is a simplified cross-sectional view of one embodiment of the present invention. A copying machine, on which a toner image corresponding to a document has been formed, is conveyed in the direction of arrow 2 to a thermal fixing device 1 of the copying machine. The heat fixing device 1 includes a heat fixing means 6 consisting of a heater 3 as a heat source, a heat roller 4 through which the heater 3 is inserted, and a pressure roller 5 parallel to the heat roller 4 and in contact with the heat roller 4. .
The copying machine carrying the toner image passes between the heat roller 4 and the pressure roller 5 to perform thermal fixing. The temperature of the surface of the heat roller 4 is detected by a thermistor 7 as a temperature detector.
第２図はこの熱定着装置１に関連する電気回路
を示すブロツク図である。サーミスタ７からの出
力は、制御手段であるマイクロコンピユータ８に
与えられる。このマイクロコンピユータ８はヒー
タ３の付勢電力を制御しこれによつて熱定着手段
６にける熱ローラ４の表面温度を後述のように制
御する。複写機には節電スイツチ９が備えられお
り、この節電スイツチ９を操作することによつて
ヒータ３の付勢電力が後述のように小さくされ
る。それによつて電力消費量が節約されるととも
に、熱定着時にはヒータ３の付勢電力が大きくさ
れて確実な熱定着が達成される。 FIG. 2 is a block diagram showing an electric circuit related to this thermal fixing device 1. As shown in FIG. The output from the thermistor 7 is given to a microcomputer 8 which is a control means. This microcomputer 8 controls the energizing power of the heater 3, thereby controlling the surface temperature of the heat roller 4 in the heat fixing means 6 as described below. The copying machine is equipped with a power saving switch 9, and by operating this power saving switch 9, the energizing power of the heater 3 is reduced as described below. This saves power consumption and increases the energizing power of the heater 3 during thermal fixing, thereby achieving reliable thermal fixing.
第３図は第２図に示されたマイクロコンピユー
タ８の動作を説明するためのフローチヤートであ
り、第４図はマイクロコンピユータ８の動作によ
つて達成される熱定着手段６における熱ローラ４
の表面温度の時間変化を示すグラフである。ステ
ツプｎ１では、電源スイツチ１０が投入されたか
否かが判断される。電源スイツチ１０が投入後に
は、ステツプｎ２に移り、サーミスタ７が断線し
ているか否かが判断される。サーミスタ７が断線
しておらず正常に作動しているときには、ステツ
プｎ３に移り、マイクロコンピユータ８に含まれ
ているメモリ１１からのデータを読み出し、時刻
ｔ０において電源投入されて熱定着手段６への付
勢電力開始後には熱定着手段６の熱ローラ４の表
面温度を定着に適した温度Ｔ２を超える値Ｔ１と
なるべき信号を読み出す。これによつてヒータ３
は熱ローラ４の表面温度がＴ１となるように電力
付勢される。温度Ｔ２はたとえば180℃であり、
温度Ｔ１はたとえば190℃である。マイクロコン
ピユータ８に備えられる計数手段であるカウンタ
１２はステツプｎ４において計数を開始する。こ
のカウンタ１２は電源の投入時刻ｔ０から時刻ｔ
１を経過した時刻ｔ２となる時間Ｗ１を計測す
る。この時間Ｗ１はたとえば10〜15分である。時
刻ｔ２に達したことがステツプｎ５で判断される
とステツプｎ６に移りメモリ１１にストアされて
いる温度Ｔ２を読み出す。これによつてヒータ３
は熱定着手段６の熱ローラ４の表面が温度Ｔ２と
なるように電力付勢される。したがつて熱ローラ
４の表面温度は時刻ｔ３において温度Ｔ２まで下
降し、その温度Ｔ２に保たれる。時刻ｔ４におい
て節電スイツチ９が操作されたことがステツプｎ
７において判断されるとステツプｎ８に移り、メ
モリ１１から温度Ｔ３を表わす信号を読み出す。
これによつてヒータ３は熱定着手段６の熱ローラ
４の表面が温度Ｔ２よりも低い温度Ｔ３となるよ
うに電力付勢される。この温度Ｔ３はたとえば
160℃であつてもよい。こうして時刻ｔ５におい
て熱ローラ４の表面温度が温度Ｔ３になり、その
温度Ｔ３が時刻ｔ６まで保たれる。時刻ｔ６にお
いて節電スイツチ９を遮断すると、そのことがス
テツプｎ９において判断されステツプｎ６に戻
る。これによつて時刻ｔ６以降の時刻ｔ７におい
て、熱ローラ４の表面温度が温度Ｔ２に保たれ
る。時刻ｔ８において電源スイツチ１０を遮断す
ると、そのことがステツプｎ１０で判断され、ス
テツプｎ１１においてカウンタ１２がカウントダ
ウンされる。カウンタ１２の計算値が予め定めた
値たとえば零に達する前の時刻ｔ９において、電
源スイツチ１０が再び導通されたときにはステツ
プｎ１０からステツプｎ５に移り熱定着手段６の
熱炉ーラの表面が温度Ｔ２となるようにヒータ３
が電力付勢される。ステツプｎ１１において、カ
ウンタ１２がカウントダウンされてその計数値が
零となるまでの時間Ｗ２経過した後の時刻ｔ１０
において、電源スイツチ１０が再び投入されたと
きにはステツプｎ１に戻り、熱定着手段６の熱ロ
ーラ４の表面温度は前述のように温度Ｔ２を超え
る温度Ｔ１となるように、カウンタ１２が予め定
めた値に達するまでの時間Ｗ１だけヒータ３が大
きな電力で付勢される。 3 is a flowchart for explaining the operation of the microcomputer 8 shown in FIG. 2, and FIG. 4 is a flowchart for explaining the operation of the microcomputer 8 shown in FIG.
3 is a graph showing changes in surface temperature over time. At step n1, it is determined whether the power switch 10 has been turned on. After the power switch 10 is turned on, the process moves to step n2, where it is determined whether or not the thermistor 7 is disconnected. When the thermistor 7 is not disconnected and is operating normally, the process moves to step n3, where the data from the memory 11 included in the microcomputer 8 is read out, and at time t0, the power is turned on and the data is transferred to the heat fixing means 6. After starting the energizing power, a signal is read out which should cause the surface temperature of the heat roller 4 of the heat fixing means 6 to be a value T1 exceeding the temperature T2 suitable for fixing. As a result, heater 3
is energized with electric power so that the surface temperature of the heat roller 4 becomes T1. The temperature T2 is, for example, 180°C,
For example, the temperature T1 is 190°C. The counter 12, which is a counting means provided in the microcomputer 8, starts counting at step n4. This counter 12 is counted from time t0 when the power is turned on to time t.
A time W1, which is a time t2 after 1, is measured. This time W1 is, for example, 10 to 15 minutes. When it is determined in step n5 that time t2 has been reached, the process moves to step n6 and the temperature T2 stored in the memory 11 is read out. As a result, heater 3
is energized with electric power so that the surface of the heat roller 4 of the heat fixing means 6 reaches a temperature T2. Therefore, the surface temperature of the heat roller 4 decreases to temperature T2 at time t3, and is maintained at that temperature T2. Step n indicates that the power saving switch 9 was operated at time t4.
If the determination is made in step n8, the process moves to step n8, where a signal representing the temperature T3 is read out from the memory 11.
As a result, the heater 3 is energized so that the surface of the heat roller 4 of the heat fixing means 6 reaches a temperature T3 lower than the temperature T2. For example, this temperature T3 is
The temperature may be 160°C. In this way, the surface temperature of the heat roller 4 reaches temperature T3 at time t5, and this temperature T3 is maintained until time t6. When the power saving switch 9 is turned off at time t6, this is determined in step n9 and the process returns to step n6. As a result, the surface temperature of the heat roller 4 is maintained at the temperature T2 at time t7 after time t6. When the power switch 10 is shut off at time t8, this is determined at step n10, and the counter 12 is counted down at step n11. When the power switch 10 is turned on again at time t9 before the calculated value of the counter 12 reaches a predetermined value, for example zero, the process moves from step n10 to step n5, and the surface of the heat furnace roller of the heat fixing means 6 reaches a temperature T2. Heater 3 so that
is energized. At step n11, the time t10 after the time W2 elapses from when the counter 12 counts down until the counted value reaches zero.
When the power switch 10 is turned on again, the process returns to step n1, and the counter 12 sets the predetermined value so that the surface temperature of the heat roller 4 of the heat fixing means 6 becomes the temperature T1 exceeding the temperature T2 as described above. The heater 3 is energized with large electric power for the time W1 until reaching .
ステツプｎ２においてサーミスタ７が断線して
いることが検出されると、ステツプｎ１２に移り
その故障状態が操作者に報知される。 When it is detected in step n2 that the thermistor 7 is disconnected, the process moves to step n12 and the operator is notified of the failure state.
カウンタ１２が電源投入後に予め定めた値にな
るまでカウントアツプする時間Ｗ１は、その時間
Ｗ１経過後における時刻ｔ２において、熱定着手
段６の周囲における熱定着を行なう環境が熱定着
に適した温度にまで上昇する値に選ばれる。これ
によつて熱定着装置１をトナー像を有する複写紙
が通過したとき、高品質で熱定着が行なわれるこ
とになる。 The time W1 during which the counter 12 counts up until it reaches a predetermined value after the power is turned on is such that at time t2 after the elapse of the time W1, the environment around the heat fixing means 6 in which heat fixing is performed reaches a temperature suitable for heat fixing. Selected for values that rise to. As a result, when a copy sheet carrying a toner image passes through the thermal fixing device 1, high-quality thermal fixing can be performed.
上述の実施例では、カウンタ１２はアツプダウ
ンカウンタが用いられ、時間Ｗ１，Ｗ２が得られ
たけれども、本考案の他の実施例として２つのカ
ウンタを備え一方のカウンタで時間Ｗ１を時刻
し、もう１つのカウンタで時間Ｗ２を刻時するよ
うにしてもよい。本考案は熱ローラ４と圧ローラ
５とを含む熱定着手段６に関連して実施されるだ
けでなく、このような熱ローラ４および圧ローラ
５を有せず、ヒータからの熱によつて複写紙用の
トナー像を形成しているトナーを加熱溶融するよ
うにしたいわゆる雰囲気による熱定着手段に関連
してもまた実施されることができる。 In the above-mentioned embodiment, the counter 12 is an up-down counter, and the times W1 and W2 are obtained, but in another embodiment of the present invention, two counters are provided, one counter counts the time W1, and the other counts the time W1. The time W2 may be clocked by one counter. The present invention is not only implemented in conjunction with a heat fixing means 6 including a heat roller 4 and a pressure roller 5, but also does not have such a heat roller 4 and pressure roller 5, and is carried out by heat from a heater. It can also be implemented in conjunction with a so-called atmospheric heat fixing means designed to heat and melt the toner forming the toner image for copy paper.
以上の如く本考案によれば、加熱源への付勢電
力遮断後において、計数手段が所定時間Ｗ２を計
数するまでに加熱源への電力付勢が開始されたと
きには、制御手段によつて前記検出温度が熱定着
温度に適した温度Ｔ２を維持するように加熱源へ
の電力付勢を制御するようにしたので、前記所定
時間Ｗ２を熱定着手段の環境温度が不所望に低下
してしまわない時間に予め設定しておくことによ
つて、迅速に前記環境温度を上昇させて熱定着に
適した温度Ｔ２にすることができる。また、この
ときの検出器の検出温度が熱定着に適した温度Ｔ
２になるように加熱源が電力付勢されるので、熱
定着手段の環境温度が前記温度Ｔ２を超えてむや
みに高くなることはなく、これによつてたとえば
トナーが熱定着手段に付着する、いわゆるオフセ
ツト現象が生じるおそれはなく、高品質の熱定着
を行うことができる。しかも前記温度Ｔ２より高
い温度に熱定着手段の環境温度を上昇させないの
で、検出温度がＴ２となつたときに加熱源への電
力を遮断すればよく、無駄な電力消費を防止する
ことができる。 As described above, according to the present invention, after the energizing power to the heating source is cut off, if the energizing of the heating source is started before the counting means counts the predetermined time W2, the control means controls the Since the power application to the heating source is controlled so that the detected temperature maintains the temperature T2 suitable for the heat fixing temperature, the environmental temperature of the heat fixing means does not undesirably drop during the predetermined time W2. By setting the temperature in advance to a time when no temperature is available, the environmental temperature can be quickly raised to a temperature T2 suitable for heat fixing. Also, the detected temperature of the detector at this time is a temperature T suitable for heat fixing.
Since the heating source is energized such that the temperature T2 is higher than the temperature T2, the environmental temperature of the heat fixing means does not rise unnecessarily above the temperature T2, thereby causing, for example, toner to adhere to the heat fixing means. There is no risk of so-called offset phenomenon occurring, and high-quality heat fixing can be performed. Moreover, since the environmental temperature of the heat fixing means is not raised to a temperature higher than the temperature T2, it is sufficient to cut off the power to the heating source when the detected temperature reaches T2, and wasteful power consumption can be prevented.
また加熱源への付勢電力遮断後において、計数
手段が所定時間Ｗ２を計数した後に加熱源への電
力付勢が開始されたときには、制御手段によつて
前記検出温度を熱定着に適した温度Ｔ２を越える
温度Ｔ１に維持するように加熱源への電力付勢を
制御するので、熱定着手段の環境温度を短時間で
熱定着に適した温度Ｔ２に達し、これによつて熱
定着に適した温度Ｔ２に達する以前の低い温度で
熱定着動作が行われることを防止して、確実な熱
定着を行うことができ、したがつて高品質の熱定
着を行うことができる。 Further, after the power supply to the heat source is cut off, when power supply to the heat source is started after the counting means has counted the predetermined time W2, the control means adjusts the detected temperature to a temperature suitable for heat fixing. Since the power application to the heating source is controlled to maintain the temperature T1 exceeding T2, the environmental temperature of the heat fixing means reaches the temperature T2 suitable for heat fixing in a short time, thereby making it suitable for heat fixing. It is possible to prevent the thermal fixing operation from being performed at a low temperature before reaching the temperature T2, thereby ensuring reliable thermal fixing, and therefore high quality thermal fixing.
第１図は本考案の一実施例の簡略化した縦断面
図、第２図は第１図に示される熱定着装置１の電
気回路を示すブロツク図、第３図は第２図に示さ
れたマイクロコンピユータ８の動作を説明するた
めのフローチヤート、第４図は熱定着手段６の熱
ローラ４の表面温度の時間経過を示すグラフであ
る。
１……熱定着装置、３……ヒータ、４……熱ロ
ーラ、５……圧ローラ、６…熱定着手段、７……
サーミスタ、８……マイクロコンピユータ、１０
……電源スイツチ。
FIG. 1 is a simplified vertical sectional view of one embodiment of the present invention, FIG. 2 is a block diagram showing the electric circuit of the heat fixing device 1 shown in FIG. 1, and FIG. FIG. 4 is a flow chart for explaining the operation of the microcomputer 8, and is a graph showing the time course of the surface temperature of the heat roller 4 of the heat fixing means 6. DESCRIPTION OF SYMBOLS 1... Heat fixing device, 3... Heater, 4... Heat roller, 5... Pressure roller, 6... Heat fixing means, 7...
Thermistor, 8...Microcomputer, 10
...Power switch.
Claims (1)
手段によつて熱定着を行う複写機の熱定着装置に
おいて、 前記熱定着手段の温度を検出する温度検出器
と、 前記温度検出器によつて検出される検出温度に
基づいて、前記加熱源への電力付勢を制御する制
御手段と、 前記加熱源への付勢電力遮断後に所定時間を計
数する計数手段とを含み、 前記制御手段は、計数手段による所定時間Ｗ２
を計数するまでに加熱源への電力付勢が開始され
ると、前記検出温度を熱定着に適した温度Ｔ２に
維持し、計数手段が前記所定時間Ｗ２を計数した
後に前記加熱源への電力付勢が開始されると、前
記検出温度を熱定着に適した温度Ｔ２を越える温
度Ｔ１に維持するように、前記加熱源への電力付
勢を制御することを特徴とする複写機の熱定着装
置。[Claims for Utility Model Registration] In a heat fixing device of a copying machine which heat fixes a toner image on copy paper by a heat fixing means equipped with a heat source, a temperature detector detects the temperature of the heat fixing means. and a control means for controlling power energization to the heating source based on the detected temperature detected by the temperature detector, and a counting means for counting a predetermined time after the energizing power to the heating source is cut off. The control means is configured to control the predetermined time W2 by the counting means.
If power application to the heat source is started before counting W2, the detected temperature is maintained at a temperature T2 suitable for heat fixing, and after the counting means has counted the predetermined time W2, power to the heat source is started. A thermal fixing device for a copying machine characterized in that, when energizing is started, energizing power to the heating source is controlled so as to maintain the detected temperature at a temperature T1 exceeding a temperature T2 suitable for thermal fixing. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11755284U JPS60169664U (en) | 1984-07-30 | 1984-07-30 | Copy machine heat fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11755284U JPS60169664U (en) | 1984-07-30 | 1984-07-30 | Copy machine heat fixing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60169664U JPS60169664U (en) | 1985-11-11 |
| JPH0328444Y2 true JPH0328444Y2 (en) | 1991-06-19 |
Family
ID=30676456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11755284U Granted JPS60169664U (en) | 1984-07-30 | 1984-07-30 | Copy machine heat fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60169664U (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2789470B2 (en) * | 1988-07-26 | 1998-08-20 | 京セラ株式会社 | Thermal fixing roller temperature control method |
| US5701554A (en) | 1994-06-10 | 1997-12-23 | Seiko Epson Corporation | Fixing apparatus having controller for setting a target temperature and for estimating the amount of heat transferred to a pressure roller |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52127341A (en) * | 1976-04-19 | 1977-10-25 | Canon Inc | Fixing device for copying machne for electronic photography |
| JPS5589879A (en) * | 1978-12-27 | 1980-07-07 | Matsushita Graphic Commun Syst Inc | Temperature control system of fixing device |
| JPS5699370A (en) * | 1980-01-08 | 1981-08-10 | Ricoh Co Ltd | Method of controlling temperature to heating roll in powder toner image fixing device |
-
1984
- 1984-07-30 JP JP11755284U patent/JPS60169664U/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52127341A (en) * | 1976-04-19 | 1977-10-25 | Canon Inc | Fixing device for copying machne for electronic photography |
| JPS5589879A (en) * | 1978-12-27 | 1980-07-07 | Matsushita Graphic Commun Syst Inc | Temperature control system of fixing device |
| JPS5699370A (en) * | 1980-01-08 | 1981-08-10 | Ricoh Co Ltd | Method of controlling temperature to heating roll in powder toner image fixing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60169664U (en) | 1985-11-11 |
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