JP2553067B2 - Fixing control method for copier - Google Patents
Fixing control method for copierInfo
- Publication number
- JP2553067B2 JP2553067B2 JP62041548A JP4154887A JP2553067B2 JP 2553067 B2 JP2553067 B2 JP 2553067B2 JP 62041548 A JP62041548 A JP 62041548A JP 4154887 A JP4154887 A JP 4154887A JP 2553067 B2 JP2553067 B2 JP 2553067B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- fixing
- thermistor
- output
- 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)
Description
【発明の詳細な説明】 技術分野 本発明は、サーミスタを定着ローラに接触させて該定
着ローラの温度を検知し、その検知出力によって定着性
保証温度の判定を行ない定着制御を行なう電子写真複写
機の定着制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic copying machine in which a thermistor is brought into contact with a fixing roller to detect the temperature of the fixing roller, and the detection output of the thermistor is used to determine the fixing property guarantee temperature to perform fixing control. The present invention relates to a fixing control method.
従来技術 電子写真複写機の定着装置としては、第１図に示す如
く、ヒータ３を内蔵する定着ローラ１とこれに圧接する
加圧ローラ２とよりなるローラ対のニップ部に未定着ト
ナー像を担持する転写紙４を通紙し、熱と圧力によりト
ナー像を転写紙面に融着する熱ローラ定着装置が広く用
いられている。2. Description of the Related Art As a fixing device of an electrophotographic copying machine, as shown in FIG. 1, an unfixed toner image is formed in a nip portion of a roller pair consisting of a fixing roller 1 having a heater 3 built therein and a pressure roller 2 in pressure contact with the fixing roller 1. 2. Description of the Related Art A heat roller fixing device is widely used in which a transfer paper 4 to be carried is passed through and a toner image is fused to the transfer paper surface by heat and pressure.
良好な定着性を保証するため、定着ローラは所定の温
度範囲に制御されるが、定着ローラの温度制御のための
温度検知は、精度、コストなどの点から、第１図に示す
如く、サーミスタ５を定着ローラ１の周面に接触させて
行なうものが多い。サーミスタは温度を抵抗値に変えて
出力するが、その出力を定着ローラの温度とみなしてこ
れによりヒータ３を点滅して定着ローラ１の温度制御を
行なう。定着ローラの温度制御の一つに定着性保証温度
制御がある。これは、機械の高速化と省電力化の要求に
対処するためのものである。定着性を保証するための定
着ローラの温度を定着性保証温度とし、定着ローラの温
度が低下してその温度迄下ると機械を停止しウォームア
ップ状態とするか、あるいはコピースピードを落して定
着ローラの温度低下を防止するなど、機械独自の制御が
行なわれる。The fixing roller is controlled within a predetermined temperature range in order to ensure good fixing performance. However, the temperature detection for controlling the temperature of the fixing roller is as shown in FIG. 1 in view of accuracy and cost. In many cases, the step 5 is carried out by contacting the peripheral surface of the fixing roller 1. The thermistor converts the temperature into a resistance value and outputs it, and regards the output as the temperature of the fixing roller, and thereby the heater 3 is blinked to control the temperature of the fixing roller 1. One of temperature control of the fixing roller is temperature control of fixing property. This is to meet the demand for higher speed and power saving of the machine. The temperature of the fixing roller for guaranteeing the fixing property is set as the fixing property guarantee temperature, and when the temperature of the fixing roller decreases and drops to that temperature, the machine is stopped and warmed up, or the copy speed is decreased to fix the fixing roller. Machine-specific control is performed to prevent the temperature from dropping.
ところで、上記の如く、サーミスタを定着ローラの周
面に当接させて温度検知を行なう場合は、サーミスタの
半導体の表面のうち、定着ローラに接しているのは一部
分であり、他の部分は保護材を介して雰囲気に接してい
る。そのため、定着ローラの雰囲気温度によって、サー
ミスタの出力が同じであってもローラの温度が異なる場
合が生ずる。By the way, when the temperature is detected by bringing the thermistor into contact with the peripheral surface of the fixing roller as described above, only a part of the semiconductor surface of the thermistor is in contact with the fixing roller, and the other part is protected. We are in contact with the atmosphere through the materials. Therefore, depending on the ambient temperature of the fixing roller, the temperature of the roller may differ even if the output of the thermistor is the same.
第２図に雰囲気温度（代表値として第１図中のＡ部の
温度を採る）がT1とT2に変化したときの定着ローラ温度
とサーミスタ出力の関係の曲線の一例を示す。T1は機械
がウォームアップ直後の雰囲気の温度であり、T2はその
後コピー枚数を重ね、あるいは待機時間が経過して定常
状態になったときの雰囲気の温度である。第３図はウォ
ームアップ直後から連続コピーを取った時のＡ部の温度
とコピー枚数の関係を示す図で、ウォームアップにより
Ａ部の温度がT1になった後、連続コピー枚数がN0枚にな
った時、Ａ部の温度がT2になることを示している。又、
第４図は、ウォームアップ後待機状態の時の時間経過と
Ａ部の温度変化との関係を示す図であり、電源投入後t0
時間でＡ部の温度がT2に飽和することを示している。FIG. 2 shows an example of a curve of the relationship between the fixing roller temperature and the thermistor output when the ambient temperature (the temperature of the portion A in FIG. 1 is taken as a representative value) changes to T 1 and T 2 . T 1 is the temperature of the atmosphere immediately after the machine is warmed up, and T 2 is the temperature of the atmosphere when the number of copies is repeated or the waiting time has elapsed and the machine is in a steady state. FIG. 3 is a diagram showing the relationship between the temperature of the part A and the number of copies when continuous copying is performed immediately after the warm-up. After the temperature of the part A becomes T 1 due to the warm-up, the number of continuous copies is N 0. It shows that the temperature of the part A becomes T 2 when it becomes a sheet. or,
FIG. 4 is a diagram showing a relationship between a lapse of time in a standby state after warm-up and a temperature change of the portion A, t 0 after the power is turned on.
It shows that the temperature of part A saturates to T 2 with time.
さて、第２図において、横軸は定着ローラ温度であり
TQは定着性保証温度、T0は定着ローラ制御温度である。
Ａ部の温度がT1の場合は、定着ローラ温度がTQでサーミ
スタ出力はR1になるが、Ａ部の温度がT2の場合はサーミ
スタはより加熱されるので抵抗が減少し、サーミスタ出
力はR2に減少する。従来は雰囲気温度の変化にかゝわら
ず、R1又はR2のいずれか一方のみで定着性保証温度を代
用させていた。そこで、Ａ部の温度が充分上ったT2の時
に定着ローラが定着保証温度TQなるサーミスタ出力R2で
常に定着性保証温度を代用させた場合は、Ａ部の温度が
T1にしか上っていない時はサーミスタ出力がR2のときは
定着ローラはTQより高いTQ2になっており、これで制御
する場合はまだ定着性があるにも拘らず機械を止めた
り、ウォームアップをすることになりムダを生ずる。逆
に、Ａ部の温度がT1のときに定着ローラ温度がTQになる
サーミスタ出力R1で常に定着性保証温度を代用させた場
合は、Ａ部の温度がT2に上った状態でサーミスタ出力が
R1になって時には定着ローラの温度はTQより低いTQ1に
なっており、定着不良を生ずる可能性を生ずる。Now, in FIG. 2, the horizontal axis represents the fixing roller temperature.
T Q is the fixing property guarantee temperature, and T 0 is the fixing roller control temperature.
When the temperature of the part A is T 1 , the fixing roller temperature is T Q and the thermistor output is R 1. However, when the temperature of the part A is T 2 , the thermistor is heated more and the resistance decreases. The output reduces to R 2 . In the past, regardless of the change in the ambient temperature, only R 1 or R 2 was used as a substitute for the fixability guarantee temperature. Therefore, if the fixing roller is always used as a substitute for the fixing property guarantee temperature with the thermistor output R 2 at which the fixing roller has the fixing guarantee temperature T Q at the time of T 2 when the temperature of the A part is sufficiently high, the temperature of the A part is
When not only up to T 1 has become higher T Q2 than the fixing roller T Q when the thermistor output is R 2, stopped even though no mechanical case, there is still fixability controlled by this Or it will be a waste of heat as it will be warmed up. On the contrary, when the fixing roller guarantee temperature is always substituted by the thermistor output R 1 where the fixing roller temperature becomes T Q when the temperature of the A portion is T 1 , the temperature of the A portion rises to T 2. And the thermistor output is
At R 1 , the temperature of the fixing roller is T Q 1 lower than T Q , which may cause fixing failure.
なお、Ａ部の温度を検知して常にサーミスタ出力に対
して補正を掛けることも考えられるが、その場合はＡ部
の温度を検知するための検知手段が必要となりコストの
上昇と制御機構の複雑化をまぬがれない。It should be noted that it is possible to detect the temperature of the portion A and always correct the output of the thermistor, but in that case, a detection means for detecting the temperature of the portion A is required, which increases the cost and complicates the control mechanism. I can't avoid becoming a person.
目 的 本発明は、従来の複写機の熱ローラ定着装置の定着制
御方法の上記の欠点を除去した、簡単な構成で、ムダな
く定着制御を行なうことのできる定着制御方法を提供す
ることを目的とする。It is an object of the present invention to provide a fixing control method which eliminates the above-mentioned drawbacks of the conventional fixing method for a heat roller fixing device of a copying machine and has a simple structure and which can perform fixing control without waste. And
構 成 本発明は上記の目的を達成させるため、サーミスタを
定着ローラに接触させて該定着ローラの温度を検知し、
その検知出力によって定着性保証温度の判定を行ない定
着制御を行なう電子写真複写機の定着制御方法におい
て、複写機に電源投入後の総コピー枚数が所定の枚数に
達するか、または電源投入後所定時間を経過するまで
は、上記サーミスタの出力R1を、それ以後は上記R1より
も小さいサーミスタの出力R2をそれぞれ定着性保証温度
の代用値とすることを特徴とする。In order to achieve the above-mentioned object, the present invention brings a thermistor into contact with a fixing roller to detect the temperature of the fixing roller,
In the fixing control method of the electrophotographic copying machine, which performs the fixing control by judging the fixing property guaranteed temperature based on the detection output, the total number of copies after the power is turned on to the copying machine reaches a predetermined number, or a predetermined time after the power is turned on. Until the above, the output R 1 of the thermistor and the output R 2 of the thermistor smaller than R 1 thereafter are used as substitute values of the fixing property guarantee temperature.
以下、本発明の定着制御方法を、第１図で説明した熱
ローラ定着装置の制御に適用した実施例をフローチャー
トで説明する。An embodiment in which the fixing control method of the present invention is applied to the control of the heat roller fixing device described in FIG. 1 will be described below with reference to a flowchart.
第５図は電源投入後、コピー枚数がN0枚まではサーミ
スタ５の検知出力R1を保証温度として代用し、それ以後
はR2を保証温度として代用するように制御する制御動作
のフローを示すものである。第５図の（ａ）は複写機全
体の動作のフローを説明しており、メインスイッチオン
によりイニシァライズされ、タイマがクリアされる。次
いで定着性保証温度の値セットが行なわれるが、そのフ
ローは（ｂ）図に詳細に示されている。図中「CCOPY≧N
0」は、メインスイッチオン後設定値N0枚コピーがなさ
れたか否かの判断である。CCOPY＜N0なら、定着性保証
温度はサーミスタの抵抗値でR1にセットされる。「RCON
T0←R1」はこのことを示している。CCOPY≧N0なら、R2
にセットされる。「RCONT0←R2」はこのことを示してい
る。この値をそれぞれ定着性保証温度として制御が行な
われ、給紙制御が行なわれる。給紙制御部では１枚給紙
される毎にコピーカウンタ（CCOPY）が１つずつカウン
トアップされる。FIG. 5 shows a flow of control operation in which after the power is turned on, the detection output R 1 of the thermistor 5 is used as a guaranteed temperature until the number of copied sheets is N 0 , and thereafter R 2 is used as a guaranteed temperature. It is shown. FIG. 5A illustrates the flow of the operation of the entire copying machine. When the main switch is turned on, it is initialized and the timer is cleared. Next, the value of the fixing property guarantee temperature is set, and its flow is shown in detail in FIG. In the figure, “CCOPY ≧ N
“ 0 ” is a judgment as to whether or not the set value N 0 copies have been made after the main switch is turned on. If CCOPY <N 0 , the fixing stability guarantee temperature is set to R 1 by the resistance value of the thermistor. "RCON
“T0 ← R 1 ” indicates this. If CCOPY ≧ N 0 , R 2
Is set to "RCONT0 ← R 2" indicates that this. Each of these values is used as a fixing property guarantee temperature for control, and paper feed control is performed. In the paper feed control unit, the copy counter (CCOPY) is incremented by one each time one paper is fed.
第６図は、電源投入後t0時間経過迄はサーミスタ検知
出力R1を定着保証温度として代用し、それ以後はR2を代
用するように制御する場合の制御動作のフローチャー
ト、第７図は、検知出力R1をN0枚コピー完了又はt0時間
経過のうちいずれか早い方までの定着保証温度の代用と
し、それ以後はR2を定着保証温度とした制御のフローチ
ャートである。これらの説明は第５図の説明から容易に
類推できるので煩瑣をさけるためこれ以上の説明は省略
する。FIG. 6 is a flow chart of the control operation when the thermistor detection output R 1 is used as the guaranteed fixing temperature until t 0 time after the power is turned on, and thereafter R 2 is used as a substitute, and FIG. 6 is a flow chart of control in which the detection output R 1 is used as a substitute for the guaranteed fixing temperature until the copy of N 0 sheets is completed or t 0 time elapses, whichever comes first, and thereafter R 2 is used as the guaranteed fixing temperature. Since these explanations can be easily inferred from the explanation of FIG. 5 and are avoided, further explanation is omitted.
なお、サーミスタの出力R1と補正値に相当する値R2と
の関係は、固々の定着装置の定着ローラとそのハウジン
グ等の位置関係による雰囲気温度の変化の仕方やサーミ
スタの定着ローラへの接触のさせ方等によって変化する
ので、機種毎に実測して決定することが必要である。The relationship between the output R 1 of the thermistor and the value R 2 corresponding to the correction value depends on how the ambient temperature changes due to the positional relationship between the fixing roller of the fixing device and its housing, and the fixing roller of the thermistor. Since it changes depending on how to make contact, it is necessary to actually measure and determine for each model.
効 果 以上の如く、本発明によれば、適可な定着保証温度を
決定することができ、定着性を保証しつゝ機械の不必要
なコピー中断等のムダを排除することが可能となる。Effects As described above, according to the present invention, it is possible to determine an appropriate fixing guarantee temperature, guarantee the fixing property, and eliminate unnecessary waste such as copying interruption of the machine. .
第１図は本発明の方法が適用される熱ローラ定着装置の
一例の構成を示す側断面図、第２図は定着ローラ周囲温
度をパラメータとして示す定着ローラ温度とサーミスタ
出力との関係の一例を示す曲線図、第３図は定着ローラ
ウォームアップ後連続コピーを行なう場合のコピー枚数
とローラのウォームアップ後待機した場合の待機時間と
ローラ周囲温度の変化の関係の一例を示す曲線図、第４
図は定着ローラのウォームアップ後待機した場合の待機
時間とローラー周囲温度の変化の関係の一例を示す曲線
図、第５図、第６図及び第７図は本発明の定着制御にお
ける制御動作のフローの一例を示すフローチャートであ
る。 １……定着ローラ、２……加圧ローラ ３……ヒータ、４……転写紙 ５……サーミスタFIG. 1 is a side sectional view showing the structure of an example of a heat roller fixing device to which the method of the present invention is applied, and FIG. 2 is an example of the relationship between the fixing roller temperature and the thermistor output showing the temperature of the fixing roller as a parameter. FIG. 4 is a curve diagram showing the relationship between the number of copies when performing continuous copying after the fixing roller warms up, the waiting time when the roller is warmed up and the change in the roller ambient temperature, and FIG.
The figure is a curve diagram showing an example of the relationship between the waiting time after the fixing roller warms up and the change in the roller ambient temperature, and FIGS. 5, 6, and 7 show the control operation in the fixing control of the present invention. It is a flowchart which shows an example of a flow. 1 ... Fixing roller, 2 ... Pressure roller 3 ... Heater, 4 ... Transfer paper 5 ... Thermistor
Claims (2)
着ローラの温度を検知し、その検知出力によって定着性
保証温度の判定を行ない定着制御を行なう電子写真複写
機の定着制御方法において、 複写機に電源投入後の総コピー枚数が所定の枚数に達す
るか、または電源投入後所定時間を経過するまでは、上
記サーミスタの出力R1を、それ以後は上記R1よりも小さ
いサーミスタの出力R2をそれぞれ定着性保証温度の代用
値とすることを特徴とする定着制御方法。1. A fixing control method for an electrophotographic copying machine, wherein a thermistor is brought into contact with a fixing roller, the temperature of the fixing roller is detected, and the temperature at which the fixing property is guaranteed is determined based on the detected output to perform fixing control. Until the total number of copies after the power is turned on reaches a predetermined number, or until a predetermined time has passed after the power is turned on, the output R 1 of the thermistor is output, and thereafter, the output R 2 of the thermistor smaller than R 1 is output. The fixing control method is characterized in that each of the values is used as a substitute value of the fixing property guarantee temperature.
後定着ローラの雰囲気温度が概ね定常状態にまで上昇す
るための枚数または時間であることを特徴とする特許請
求の範囲第１項に記載の定着制御方法。2. The predetermined number and the predetermined time are the number or time for the ambient temperature of the fixing roller to rise to a substantially steady state after the power is turned on. The fixing control method described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62041548A JP2553067B2 (en) | 1987-02-26 | 1987-02-26 | Fixing control method for copier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62041548A JP2553067B2 (en) | 1987-02-26 | 1987-02-26 | Fixing control method for copier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63208890A JPS63208890A (en) | 1988-08-30 |
| JP2553067B2 true JP2553067B2 (en) | 1996-11-13 |
Family
ID=12611477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62041548A Expired - Fee Related JP2553067B2 (en) | 1987-02-26 | 1987-02-26 | Fixing control method for copier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2553067B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS613011Y2 (en) * | 1977-04-18 | 1986-01-30 |
-
1987
- 1987-02-26 JP JP62041548A patent/JP2553067B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63208890A (en) | 1988-08-30 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |