JPS649633B2 - - Google Patents
Info
- Publication number
- JPS649633B2 JPS649633B2 JP55127107A JP12710780A JPS649633B2 JP S649633 B2 JPS649633 B2 JP S649633B2 JP 55127107 A JP55127107 A JP 55127107A JP 12710780 A JP12710780 A JP 12710780A JP S649633 B2 JPS649633 B2 JP S649633B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- heating roll
- heating
- power
- fixing device
- 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 28
- 230000001360 synchronised effect Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000004904 shortening Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
- G03G15/2039—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat with means for controlling the fixing temperature
- G03G15/205—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat with means for controlling the fixing temperature specially for the mode of operation, e.g. standby, warming-up, error
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fixing For Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Description
【発明の詳細な説明】
この発明は電子複写機の加熱定着装置におい
て、定着装置内の温度が制御温度へ達する前に複
写可能信号（以下レデイ信号という）を発して、
定着装置内の温度が制御温度より高くなる所謂る
オーバシユートを少なくした温度制御装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION In a heat fixing device of an electronic copying machine, the present invention issues a copy ready signal (hereinafter referred to as a ready signal) before the temperature inside the fixing device reaches a control temperature.
The present invention relates to a temperature control device that reduces so-called overshoot, in which the temperature inside a fixing device becomes higher than a control temperature.
従来電子複写機の定着装置としては、加熱ロー
ルを用いた加熱ロール方式や熱板方式、ラジアン
ト方式、オーブン方式などが知られている。これ
ら方式は何れも熱を利用して用紙上のトナー像を
溶融し用紙に定着するもので、定着装置内の温度
はトナーの溶融点以上に維持する必要がある。こ
のためこれら方式では複写機の電源投入後、上記
トナーの溶融温度に達するまでにウオームアツプ
時間を必要とし、この間は複写ができないことか
ら、従来からこのウオームアツプ時間を短縮する
ことが種々検討されており、加熱ロールの熱容量
を小さくしたり、ウオームアツプ時間中に大電力
を投入してウオームアツプ時間を短縮する方法な
どがすでに提唱されている。またこれら方法では
定着装置内の温度が制御温度に達したときレデイ
信号を発して複写可能であることを知らせるよう
になつているが、定着装置へ電力の投入を開始し
た直後は、上記制御温度を検出する検出器やその
周辺が冷えた状態にあるため、定着装置内の温度
が定着可能温度に達していても実際にはこれより
低い温度を検出しており、このため検出器が制御
温度を検出した時点では定着装置内の温度は第１
図に示すようにオーバシユート温度に達してしま
い、この間の温度差ａ分だけ余計に時間と電力を
消費する不具合があつた。 Conventionally, known fixing devices for electronic copying machines include a heating roll system using a heating roll, a hot plate system, a radiant system, and an oven system. All of these methods use heat to melt the toner image on the paper and fix it on the paper, and the temperature inside the fixing device needs to be maintained above the melting point of the toner. For this reason, these methods require warm-up time after the copier is turned on until the toner reaches its melting temperature, and since copying cannot be performed during this time, various studies have been made to shorten this warm-up time. Therefore, methods have already been proposed to shorten the warm-up time by reducing the heat capacity of the heating roll or by applying large amounts of electric power during the warm-up time. In addition, in these methods, when the temperature inside the fixing device reaches the control temperature, a ready signal is issued to notify that copying is possible. Because the detector and its surroundings are cold, even if the temperature inside the fixing device has reached the fixing temperature, it actually detects a temperature lower than this, which causes the detector to lower the control temperature. At the time when the temperature inside the fixing device is detected, the temperature inside the fixing device is
As shown in the figure, the overshoot temperature was reached, and there was a problem that extra time and power were consumed by the temperature difference a during this time.
この発明はかかる不具合を改善する目的でなさ
れたもので、加熱ヒータを内装した加熱ロールに
電力投入後、加熱ロールの表面温度が制御温度に
達する前にレデイ信号を発して複写可能な状態と
し、トナーが転写された用紙が加熱ロールに達す
る前に加熱ロール表面の温度が制御温度に達する
ようにした画像形成装置における定着装置の温度
制御装置を提供して、余分な電力と時間を消費す
るオーバシユートを低減しようとするものであ
る。 This invention was made with the aim of improving such a problem, and after power is applied to a heating roll equipped with a heating heater, a ready signal is issued before the surface temperature of the heating roll reaches a control temperature to make it ready for copying. Provided is a temperature control device for a fixing device in an image forming apparatus that allows the temperature of the surface of a heating roll to reach a control temperature before paper to which toner is transferred reaches the heating roll, thereby eliminating overshoot that consumes extra power and time. The aim is to reduce the
以下この発明を図示の一実施例について詳述す
る。第２図において１は図示しない電子複写機の
定着装置に設けられた加熱ロール、２は該加熱ロ
ール１内に設けられたヒータで、トライアツクの
ような電力制御素子３を介して交流電源４が印加
されている。５は上記加熱ロール１の表面付近に
設けられたサーミスタなどの温度検出素子で、内
部抵抗RTと複数の抵抗R1，R2，R3及びR4により
ブリツジ回路を構成しており、温度検出素子５及
び抵抗R1間の電位VA及び抵抗R2，R3間の電位VC
はレデイ温度検出用比較器６へ、また上記電位
VA及び抵抗R3，R4間の電位VBは制御温度検出用
比較器７へ夫々入力されている。比較器６の出力
側には複写機を複写可能な状態とするレデイ回路
８及び比較器６の出力が低いレベルにあるときに
常時電源電圧のOVに同期した出力を発生し、ま
た比較器６の出力が高レベルにあるときには、電
源電圧のOVに同期した信号２個を１個おきに発
生する電力制御回路９が夫々接続されていると共
に、電力制御回路９の出力は上記比較器７の出力
側に接続された電力制御素子駆動信号発生器１０
の出力とともにアンド回路１１へ入力され、この
アンド回路１１の出力により上記電力制御素子３
が次のように制御される。 The present invention will be described in detail below with reference to an illustrated embodiment. In FIG. 2, 1 is a heating roll provided in a fixing device of an electronic copying machine (not shown), 2 is a heater provided in the heating roll 1, and an AC power source 4 is supplied via a power control element 3 such as a triax. is being applied. Reference numeral 5 denotes a temperature detection element such as a thermistor provided near the surface of the heating roll 1, which constitutes a bridge circuit with an internal resistance R T and a plurality of resistors R 1 , R 2 , R 3 and R 4 . Potential V A between detection element 5 and resistor R 1 and potential V C between resistors R 2 and R 3
to the ready temperature detection comparator 6, and the above potential
V A and the potential V B between the resistors R 3 and R 4 are input to the control temperature detection comparator 7, respectively. On the output side of the comparator 6, there is a ready circuit 8 that makes the copying machine ready for copying, and a ready circuit 8 that always generates an output synchronized with the power supply voltage OV when the output of the comparator 6 is at a low level. When the output of the comparator 7 is at a high level, the power control circuits 9 that generate every other two signals synchronized with the power supply voltage OV are connected to each other, and the output of the power control circuit 9 is connected to the output of the comparator 7. Power control element drive signal generator 10 connected to the output side
is input to the AND circuit 11 along with the output of the power control element 3.
is controlled as follows.
しかしていま図示しない複写機の電源を投入す
ると、加熱ロール１のヒータ２にも第３図ａに示
す波形の交流電源４が投入されてヒータ２による
加熱ロール１の加熱が開始される。加熱ロール１
の表面温度は常時温度検出素子５が検出して温度
に応じた起電力を発生し、各抵抗R1…間の電位
がVA＞VC＞VBの関係にある表面温度の低いとき
には、比較器７の出力は「Ｈ」となつて電力制御
素子駆動信号発生器１０より第３図ｂに示すよう
な電源電圧のOVに同期した出力が出され、また
このとき比較器６の出力は「Ｌ」となつているの
で、電力制御回路９には電源電圧OVに同期した
第３図ｃに示す信号c′が発生され、従つてアンド
回路１１の出力により電力制御素子３は導通状態
に維持される。 However, when the copying machine (not shown) is powered on, the AC power source 4 having the waveform shown in FIG. heating roll 1
The surface temperature of is constantly detected by the temperature detection element 5 and generates an electromotive force according to the temperature, and when the surface temperature is low, the potential between each resistor R 1 is in the relationship V A > V C > V B. The output of the comparator 7 becomes "H", and the power control element drive signal generator 10 outputs an output synchronized with the power supply voltage OV as shown in FIG. 3b, and at this time, the output of the comparator 6 becomes Since the signal is "L", the power control circuit 9 generates a signal c' shown in FIG. maintained.
加熱ロール１の表面温度が上昇して各部の電位
がVC≧VA＞VBの関係になると、比較器６の出力
が「Ｈ」となつて複写機の各部が複写可能状態に
なると共に、電力制御回路９は第３図ｃに示すよ
うに電源電圧のOVに同期した信号を１個おきに
２個ずつ発生するようになり（c″）、これによつ
てアンド回路１１も第３図ｄに示すように電源電
圧のOVに同期した信号を１個おきに２個ずつ発
生する（d′）ため、アンド回路１１の出力で制御
される電力制御素子３は導通状態が間隔的となつ
て、ヒータ２に第３図ｅに示すように間隔的な電
力e′が供給されるようになるため、加熱ロール１
の温度上昇曲線はレデイ信号Ｂ以後第１図破線の
ように緩いカーブとなつてさらに温度上昇を続け
る。次に各部の電位がVC＞VB＞VAの関係になる
と、比較器７の出力が「Ｌ」となるため電子制御
素子駆動信号発生器１０からの出力がなくなつて
電力制御素子３はオフ状態となり、ヒータ２への
電力の供給が停止される。これによつて加熱ロー
ル１は従来のような大幅なオーバシユートを生じ
ずに定着可能温度に達する。以後は加熱ロール１
の表面温度の高低に応じて電力制御素子３がオン
オフされ、表面温度は第１図に示す一定温度Ａに
制御されるようになる。 When the surface temperature of the heating roll 1 rises and the potential of each part becomes V C ≧V A > V B , the output of the comparator 6 becomes "H" and each part of the copying machine becomes ready for copying. As shown in FIG. 3c, the power control circuit 9 now generates two signals synchronized with the power supply voltage OV every other signal (c''), and as a result, the AND circuit 11 also generates two signals synchronized with the power supply voltage OV (c''). As shown in Figure d, two signals synchronized with the power supply voltage OV are generated every other device (d'), so the power control element 3 controlled by the output of the AND circuit 11 is in a conductive state at intervals. As a result, electric power e' is supplied to the heater 2 at intervals as shown in FIG.
After the ready signal B, the temperature rise curve becomes a gentle curve as shown by the broken line in FIG. 1, and the temperature continues to rise. Next, when the potentials of each part become in the relationship V C > V B > V A , the output of the comparator 7 becomes "L", so the output from the electronic control element drive signal generator 10 disappears, and the power control element 3 is turned off, and the supply of power to the heater 2 is stopped. As a result, the heating roll 1 reaches the fixing temperature without causing a large overshoot as in the conventional case. After that, heating roll 1
The power control element 3 is turned on and off depending on the level of the surface temperature of the surface, and the surface temperature is controlled to a constant temperature A shown in FIG.
なおこの発明は上記実施例の回路に限定される
ものではなく、例えば電力制御回路９及び比較器
７の出力をアンド回路１１へ入力して、その出力
で電力制御素子３を制御するなど種々の回路が採
用できることは勿論である。 Note that the present invention is not limited to the circuit of the above embodiment; for example, the outputs of the power control circuit 9 and the comparator 7 are input to the AND circuit 11, and the power control element 3 is controlled by the output. Of course, the circuit can be adopted.
この発明は以上詳述したように、ヒータを内装
した加熱ロールの表面温度が制御温度に達する前
にレデイ信号を発して複写可能としたことから、
電力投入直後のように温度検出器やその周辺が冷
えていて、正確な温度を検出しないことによつて
生じる加熱ロールの温度のオーバシユートを大幅
に低減できる。 As described in detail above, this invention enables copying by emitting a ready signal before the surface temperature of the heating roll equipped with a heater reaches the control temperature.
It is possible to significantly reduce the temperature overshoot of the heating roll, which occurs when the temperature sensor and its surroundings are cold, such as immediately after power is turned on, and the temperature is not detected accurately.
特に加熱ロールの表面温度を直接制御するよう
にしたことから、ウオームアツプ時のオーバシユ
ートの低減が適切になされ、これによつてウオー
ムアツプ時間の短縮とオーバシユートに投入して
いた電力の低減が図れるようになると共に、トナ
ー像が転写された用紙が定着装置へ達する前に定
着装置内の温度は定着可能な制御温度以上となつ
ているため、定着温度が低いための定着不良や加
熱ローラへのオフセツトなどの不具合も全く生じ
ない。 In particular, since the surface temperature of the heating roll is directly controlled, overshoot during warm-up can be appropriately reduced, thereby shortening warm-up time and reducing the power used for overshoot. At the same time, before the paper with the toner image transferred to it reaches the fixing device, the temperature inside the fixing device has exceeded the control temperature that allows fixing, resulting in poor fixing and offset to the heating roller due to low fixing temperature. No such problems occur at all.
図面はこの発明の一実施例を示し、第１図は制
御温度と時間の関係を示す線図、第２図は温度制
御装置の回路図、第３図は各部の波形図である。
１は加熱ロール、２はヒータ、３は電力制御素
子、５は温度検出器、６及び７は比較器。
The drawings show an embodiment of the present invention; FIG. 1 is a diagram showing the relationship between controlled temperature and time, FIG. 2 is a circuit diagram of the temperature control device, and FIG. 3 is a waveform diagram of each part. 1 is a heating roll, 2 is a heater, 3 is a power control element, 5 is a temperature detector, and 6 and 7 are comparators.
Claims (1)
ールからなる定着装置において、上記加熱ヒータ
を内装した加熱ロールに電力投入後、加熱ロール
表面が制御温度に達する前にレデイ信号を発し
て、前記加熱ロールへ供給される電力を制限する
手段と、前記加熱ロールの表面温度が制御温度に
達したのを検出して、前記加熱ロールの表面温度
を制御温度に制御する手段とを具備してなる画像
形成装置における定着装置の温度制御装置。1. In a fixing device consisting of a heating roll equipped with a heating heater and a pressure roll, after power is applied to the heating roll equipped with the heating heater, a ready signal is issued before the surface of the heating roll reaches the control temperature, and the heating An image comprising means for limiting the electric power supplied to the roll, and means for detecting when the surface temperature of the heating roll reaches the control temperature and controlling the surface temperature of the heating roll to the control temperature. A temperature control device for a fixing device in a forming device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55127107A JPS5752066A (en) | 1980-09-16 | 1980-09-16 | Equipment for controlling temperature in fixing device of electronic copying machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55127107A JPS5752066A (en) | 1980-09-16 | 1980-09-16 | Equipment for controlling temperature in fixing device of electronic copying machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5752066A JPS5752066A (en) | 1982-03-27 |
| JPS649633B2 true JPS649633B2 (en) | 1989-02-17 |
Family
ID=14951770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55127107A Granted JPS5752066A (en) | 1980-09-16 | 1980-09-16 | Equipment for controlling temperature in fixing device of electronic copying machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5752066A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0668659B2 (en) * | 1985-07-02 | 1994-08-31 | コニカ株式会社 | Fixer temperature control device |
| US6391621B1 (en) | 1999-03-03 | 2002-05-21 | Fuji Photo Film Co., Ltd. | Process for the treatment of organic gas components |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS495038A (en) * | 1972-04-27 | 1974-01-17 | ||
| JPS519841A (en) * | 1974-07-15 | 1976-01-26 | Ricoh Kk | ONDOSEIG YOKAIRO |
| JPS6041353B2 (en) * | 1977-01-17 | 1985-09-17 | キヤノン株式会社 | heating device |
| JPS5517101A (en) * | 1978-06-08 | 1980-02-06 | Olympus Optical Co Ltd | Recorder provided with heating means |
| JPS5723050Y2 (en) * | 1978-08-21 | 1982-05-19 | ||
| JPS573003Y2 (en) * | 1979-09-20 | 1982-01-19 |
-
1980
- 1980-09-16 JP JP55127107A patent/JPS5752066A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5752066A (en) | 1982-03-27 |
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