JPH0657459B2 - Printer temperature control method - Google Patents
Printer temperature control methodInfo
- Publication number
- JPH0657459B2 JPH0657459B2 JP27701285A JP27701285A JPH0657459B2 JP H0657459 B2 JPH0657459 B2 JP H0657459B2 JP 27701285 A JP27701285 A JP 27701285A JP 27701285 A JP27701285 A JP 27701285A JP H0657459 B2 JPH0657459 B2 JP H0657459B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- printing
- protection circuit
- print head
- temperature control
- 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 - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 10
- 230000020169 heat generation Effects 0.000 claims description 13
- 230000007423 decrease Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
- B41J2/35—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads providing current or voltage to the thermal head
- B41J2/355—Control circuits for heating-element selection
- B41J2/36—Print density control
- B41J2/365—Print density control by compensation for variation in temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
- B41J2/35—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads providing current or voltage to the thermal head
- B41J2/355—Control circuits for heating-element selection
Landscapes
- Electronic Switches (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明はプリンタの印刷ヘツドの温度上昇値をコント
ロールする方法に関する。Description: FIELD OF THE INVENTION The present invention relates to a method for controlling a temperature rise value of a printing head of a printer.
従来、プリンタの印刷ヘツドの温度上昇を防ぐ温度コン
トロール方法としては、種々のものが実施化されている
が、例えば、印刷ヘツドの内部に温度検出器を内蔵し、
この温度検出器により、内部温度がある一定の温度に到
達すると、温度上昇を防ぐために印刷を停止させるか、
あるいは分割印刷を行なつて印刷スループツトを低下さ
せるなどの温度コントロール方法があつた。Conventionally, as a temperature control method for preventing the temperature rise of the print head of the printer, various things have been implemented. For example, a temperature detector is built in the print head,
With this temperature detector, when the internal temperature reaches a certain temperature, printing is stopped to prevent temperature rise, or
Alternatively, there have been temperature control methods such as performing divided printing to reduce the printing throughput.
しかし、この温度コントロール方法によると、印刷ヘツ
ドの発熱部と温度検出部間の熱インピーダンスにより、
発熱部と温度検出部間に温度差が生じ、この温度差は印
刷データの印刷濃度に対応した発熱量に応じて異なる。
そのため、印刷ヘツドの内部温度を正しく検出すること
が困難であるという問題点があつた。However, according to this temperature control method, due to the thermal impedance between the heat generating part of the printing head and the temperature detecting part,
A temperature difference occurs between the heat generating portion and the temperature detecting portion, and this temperature difference varies depending on the heat generation amount corresponding to the print density of the print data.
Therefore, there is a problem that it is difficult to accurately detect the internal temperature of the print head.
第２図は印刷ヘツドの発熱部と温度検出部間の温度分布
を示すグラフである。このグラフを使つて前記問題点を
さらに言及すれば、発熱部と温度検出器の温度差T1はT1
＝Q(t)Wで示される。ここで、Ｗは発熱部からの発熱量
であり、Q(t)は発熱部と温度検出器間の熱インピーダン
スで、時間の関数で表わされる。FIG. 2 is a graph showing the temperature distribution between the heat generating portion and the temperature detecting portion of the print head. If this problem is further referred to using this graph, the temperature difference T 1 between the heat generating part and the temperature detector is T 1
= Q (t) W Here, W is the amount of heat generated from the heat generating portion, Q (t) is the thermal impedance between the heat generating portion and the temperature detector, and is expressed as a function of time.
ある一定の印刷時間経過後の温度差T1が発熱量Ｗに比例
するので、印刷ヘツド内の温度分布は第２図に示す，
，のグラフのようになる。のグラフは発熱量Ｗ＝
2w0、のグラフはＷ＝w0、のグラフはＷ＝1/2w0の場
合の温度分布を示す。Since the temperature difference T 1 after a certain printing time has elapsed is proportional to the heat generation amount W, the temperature distribution in the printing head is shown in FIG.
It becomes like the graph of. The graph shows the heat generation amount W =
2w 0, the graph of W = w 0, the graph of showing the temperature distribution in the case of W = 1 / 2w 0.
ここで、温度上昇の保護を開始するときの検出温度Ｔを
Ｗ＝w0に合わせてT0と設定すると、Ｗ＝2w0の場合、
のグラフのように、発熱部の限界耐熱温度Txを超えて印
刷ヘツドを破壊するという問題点があつた。Here, if the detected temperature T in accordance with the W = w 0 is set to T 0 for starting the protection of temperature rise, the case of W = 2w 0,
As shown in the graph, there is a problem that the print head is destroyed by exceeding the limit heat resistance temperature Tx of the heat generating part.
また、Ｗ＝1/2w0の場合、のグラフのように、限界耐
熱温度Txに至るまでには、充分余裕があるにもかかわら
ず、温度上昇保護手段が動作し、印刷スループツトの低
下を招くという問題点があつた。Further, in the case of W = 1 / 2w 0 , as shown in the graph of, although there is a sufficient margin to reach the limit heat resistant temperature Tx, the temperature rise protection means operates and causes a decrease in printing throughput. There was a problem.
そこで、この発明は前記問題点に着目してなされたもの
で、その目的とするところは、印刷ヘツドの発熱量に応
じて内部温度を正しく検出することによつて発熱部を適
正に保護するとともに、印刷速度を向上させたプリンタ
の温度コントロール方法を提供することにある。Therefore, the present invention has been made in view of the above problems, and an object thereof is to appropriately protect the heat generating portion by properly detecting the internal temperature according to the heat generation amount of the printing head. The object of the present invention is to provide a temperature control method for a printer with an improved printing speed.
前記目的を達成するこの発明の構成は印刷ヘツドの発熱
量を検出する手段と、検出された発熱量に応じて温度上
昇保護回路の動作開始温度を制御する手段と、印刷ヘツ
ドの温度が動作開始温度の設定値を越えたとき、温度上
昇保護回路の動作を開始する手段とを備えたことを特徴
とする。To achieve the above object, the structure of the present invention is to detect the heat value of the print head, to control the operation start temperature of the temperature rise protection circuit according to the detected heat value, and to start the operation of the print head temperature. And a means for starting the operation of the temperature rise protection circuit when the temperature exceeds a set value.
印刷ヘツドを動作させると、印刷デユーテイー時の印刷
ヘツドの発熱量が検出され、検出された発熱量の大きさ
によつて温度上昇保護回路の動作開始温度がコントロー
ルされ、発熱量が高いと、保護回路動作開始温度が下が
り、発熱量が低いと保護回路動作開始温度が上がる。When the print head is operated, the heat generation amount of the print head at the time of printing duty is detected, and the operation start temperature of the temperature rise protection circuit is controlled according to the detected heat generation amount. When the circuit operation start temperature decreases and the amount of heat generation is low, the protection circuit operation start temperature rises.
また、印刷ヘツドの温度が上昇し、保護回路動作開始温
度を越えると、温度上昇保護回路が動作し、印刷の停止
あるいは印刷速度の低下により、印刷ヘツドの温度上昇
が阻止され、温度が下降し、下限値に達すると、再び印
刷が開始される。When the temperature of the print head rises and exceeds the protection circuit operation start temperature, the temperature rise protection circuit operates and the print head temperature is prevented from rising due to the stop of printing or the decrease of printing speed, and the temperature drops. When the lower limit value is reached, printing is restarted.
以下、この発明の実施例を図面に基づいて詳細に説明す
る。Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
第１図はこの発明のプリンタの温度コントロール方法を
直接実施するプリンタの温度コントロール装置を示すブ
ロツク図、第４図は温度コントロール装置を示す回路図
である。FIG. 1 is a block diagram showing a printer temperature control device for directly implementing the printer temperature control method of the present invention, and FIG. 4 is a circuit diagram showing the temperature control device.
図面において、１はドライバ２によつて動作する発熱部
としてのコイル３を内蔵した印刷ヘツドで、この印刷ヘ
ツド１には内部温度を検出する温度検出器４が内蔵さ
れ、サーミスタ等の温度検出素子r0を有する。In the drawing, reference numeral 1 is a printing head having a coil 3 as a heat generating portion which is operated by a driver 2, and a temperature detector 4 for detecting an internal temperature is built in the printing head 1 and a temperature detecting element such as a thermistor. have r 0 .
温度検出器４の出力端子に接続される電圧変換器５は温
度検出器４によつて検出された内部温度を電圧信号に変
換するもので、温度検出素子r0とアース間に介在する抵
抗R0を有する。The voltage converter 5 connected to the output terminal of the temperature detector 4 converts the internal temperature detected by the temperature detector 4 into a voltage signal, and a resistor R interposed between the temperature detection element r 0 and ground. Has 0 .
また、電圧変換器５の出力端子に接続される比較器Q1は
電圧変換器５からの電圧信号を基準電圧VAと比較し、電
圧信号が基準電圧VAよりも大きいときオンとなり、小さ
いときオフとなるように動作する。Further, the comparator Q 1 connected to the output terminal of the voltage converter 5 compares the voltage signal from the voltage converter 5 with the reference voltage V A, and turns on when the voltage signal is larger than the reference voltage V A and is small. It works when turned off.
比較器Q1の出力端子に接続される温度上昇保護回路６は
比較器Q1からのオン信号に基づいて、図示しないペース
コントロール回路および印刷コントロール回路を制御す
ることによつて印刷を一時停止し、温度上昇を規制でき
るようにしたものである。Temperature protection circuit 6 connected to the output terminal of the comparator Q 1 is based on an ON signal from the comparator Q 1, paused by connexion printing to control the pace control circuit and printed control circuit (not shown) The temperature rise can be regulated.
温度上昇保護回路６の動作を開始するときの温度Ｔは比
較器Q1に入力される基準電圧VAが印刷ヘツド１からの発
熱量に応じて変位することによつてコントロールされる
ようになつている。The temperature T at which the operation of the temperature rise protection circuit 6 is started is controlled by the reference voltage V A input to the comparator Q 1 being displaced according to the amount of heat generated from the printing head 1. ing.
基準電圧VAが印刷ヘツド１からの発熱量に応じて変位す
る構成は電流検出器７と、積分回路ＲＣと、加算器８と
を接続してなる。The configuration in which the reference voltage V A is displaced according to the amount of heat generated from the printing head 1 is configured by connecting the current detector 7, the integrating circuit RC, and the adder 8.
電流検出器７は印刷ヘツド１からの発熱量を消費電力で
もつて検出するもので、ドライバ２のスイツチングトラ
ンジスタ９のエミツタ端子と、アース間に介在する抵抗
Rxを有し、この抵抗Rxによつて降下する電圧レベルの信
号が出力される。The current detector 7 detects the amount of heat generated from the printing head 1 by the consumed power, and detects the resistance between the emitter terminal of the switching transistor 9 of the driver 2 and the ground.
A signal having a voltage level that has Rx and is dropped by this resistor Rx is output.
積分回路ＲＣは電流検出器７からの電圧信号を積分した
電圧値VRCを出力するもので、抵抗R1とコンデンサC1と
からなる。The integrating circuit RC outputs a voltage value V RC obtained by integrating the voltage signal from the current detector 7, and includes a resistor R 1 and a capacitor C 1 .
加算器８は積分回路ＲＣからの積分値と基準電圧VREFと
を加算した値を比較器Q1への基準電圧VAとして出力する
もので、抵抗R2と抵抗R3とからなり、抵抗R3の端子に基
準電圧VREFが印加されている。The adder 8 outputs a value obtained by adding the integrated value from the integrating circuit RC and the reference voltage V REF as the reference voltage V A to the comparator Q 1 , and is composed of a resistor R 2 and a resistor R 3 , The reference voltage V REF is applied to the R 3 terminal.
基準電圧VREFは第２図に示す標準的印字デユーテイー印
刷時（電力ｗ）に発熱部が定格温度Txに向つて飽和する
ように温度上昇保護回路６が動作するためのバイアス電
圧である。The reference voltage V REF is a bias voltage for operating the temperature rise protection circuit 6 so that the heat generating portion is saturated toward the rated temperature Tx during the standard print duty printing (power w) shown in FIG.
温度上昇保護回路６の動作開始温度は加算器８によつて
加算された基準電圧VAの大きさによつて設定され、基準
電圧VAが大きいとき、低い動作開始温度に、基準電圧VA
が小さいとき、高い動作開始温度にそれぞれ設定される
ようになつている。Operation starting temperature of the temperature protection circuit 6 is by connexion set to the size of the I connexion summed reference voltage V A to the adder 8, when the reference voltage V A is high, the low operation start temperature, the reference voltage V A
When is small, it is set to a high operation starting temperature.
次に、温度コントロール装置の動作、つまり温度コント
ロール方法を第３図のタイムチヤートに基づいて説明す
る。Next, the operation of the temperature control device, that is, the temperature control method will be described based on the time chart of FIG.
第３図に示す「−ＡＢ漢字」の印刷データを印刷する
と、印刷ヘツド１の電流値は第３図に示す波形とな
り、電流検出器７によつて電圧レベルに変換される。When the print data of "-AB kanji" shown in FIG. 3 is printed, the current value of the print head 1 has a waveform shown in FIG. 3, and the current detector 7 converts the current value into a voltage level.
そして、電流検出器７からの出力信号は積分回路ＲＣに
よつて積分され、第３図に示す電圧値VRCが出力され
る。The output signal from the current detector 7 is integrated by the integrating circuit RC and the voltage value V RC shown in FIG. 3 is output.
次いで、加算器８によつて積分回路ＲＣからの電圧値V
RCと、基準電圧VREFとが加算され、加算値は基準電圧VA
として比較器Q1に入力される。Next, the voltage value V from the integrating circuit RC is set by the adder 8.
RC and the reference voltage V REF are added, and the added value is the reference voltage V A
Is input to the comparator Q 1 .
発熱量が大きい場合、基準電圧VAは基準電圧VREFよりも
大きく、温度上昇保護回路６の動作開始温度Ｔは低く設
定される。When the amount of heat generation is large, the reference voltage V A is higher than the reference voltage V REF , and the operation start temperature T of the temperature rise protection circuit 6 is set low.
逆に発熱量が小さい場合、基準電圧VREFよりも小さく、
温度上昇保護回路６の動作開始温度Ｔは高く設定されて
いる。Conversely, when the amount of heat generated is small, it is smaller than the reference voltage V REF ,
The operation start temperature T of the temperature rise protection circuit 6 is set high.
印刷ヘツド１の温度は温度検出器７によつて検出され、
電圧変換器５によつて電圧信号に変換される。変換され
た電圧信号は比較信号として比較器Q1に入力される。The temperature of the printing head 1 is detected by the temperature detector 7,
The voltage signal is converted by the voltage converter 5. The converted voltage signal is input to the comparator Q 1 as a comparison signal.
比較器Q1では、印刷ヘツド１の内部温度に対応した電圧
信号と、発熱量に対応した基準電圧VAとの比較により、
温度上昇保護回路６の動作開始温度Ｔがコントロールさ
れる。In the comparator Q 1 , by comparing the voltage signal corresponding to the internal temperature of the printing head 1 and the reference voltage V A corresponding to the heat generation amount,
The operation start temperature T of the temperature rise protection circuit 6 is controlled.
第３図は印刷データを印刷するときの時間と印刷ヘツ
ドの温度上昇を示すもので、標準的デユーテイー印刷時
（第２図の消費電力ｗの時）に発熱部が定格温度Txとな
るように設定された保護回路動作開始温度をTREFで示
す。FIG. 3 shows the time when printing the print data and the temperature rise of the print head, so that the heat generating part becomes the rated temperature Tx during standard duty printing (power consumption w in FIG. 2). The set protection circuit operation start temperature is indicated by T REF .
印刷デユーテイー時の消費電力が基準電圧VAででもつて
検出され、この消費電力の大きさによつて保護回路動作
開始温度Ｔがコントロールされ、消費電力が高いと保護
回路動作開始温度Ｔは下がり、消費電量が低いと、保護
回路動作開始温度Ｔは上がる。The power consumption at the time of printing duty is also detected at the reference voltage V A , the protection circuit operation start temperature T is controlled by the magnitude of this power consumption, and if the power consumption is high, the protection circuit operation start temperature T decreases, When the power consumption is low, the protection circuit operation start temperature T rises.
また、印刷ヘツド１の温度が上昇し、保護回路動作開始
温度Ｔを越えると、温度上昇保護回路６が動作し、印刷
の停止により、印刷ヘツド１の温度上昇が阻止され、温
度が下降し、下限値TLに達すると、再び印刷が開始され
る。Further, when the temperature of the print head 1 rises and exceeds the protection circuit operation start temperature T, the temperature rise protection circuit 6 operates, and the stop of printing prevents the temperature rise of the print head 1 and lowers the temperature. When the lower limit value T L is reached, printing starts again.
以上の説明から明らかなように、この発明によれば、印
刷ヘツドの発熱量を検出し、検出された発熱量に応じて
温度上昇保護回路の動作開始温度をコントロールし、印
刷ヘツドの温度が保護回路動作開始温度を越えたとき、
温度上昇保護回路の動作を開始する構成としたので、印
刷ヘツドの温度が耐熱温度以上に上昇するのを防止して
発熱部を適正に保護するとともに、印刷スループツトを
上げ、最適な印刷速度を維持する効果が得られる。As is apparent from the above description, according to the present invention, the heat generation amount of the print head is detected, the operation start temperature of the temperature rise protection circuit is controlled according to the detected heat generation amount, and the temperature of the print head is protected. When the circuit operation start temperature is exceeded,
Since the temperature rise protection circuit starts operating, the temperature of the printing head is prevented from rising above the heat resistant temperature to protect the heat generating part properly and the printing throughput is increased to maintain the optimum printing speed. The effect is obtained.
第１図はこの発明のプリンタの温度コントロール装置に
係る実施例を示すブロツク図、第２図は従来例の印刷ヘ
ツドの温度分布を示す図、第３図は実施例の動作を示す
タイムチヤート、第４図は温度コントロール装置を示す
回路図である。 １…印刷ヘツド、４…温度検出器、５…電圧変換器、６
…温度上昇保護回路、７…電流検出器、８…加算器、Q1
…比較器、VA，VREF…基準電圧、Ｔ…保護回路動作開始
温度、ＲＣ…積分回路。FIG. 1 is a block diagram showing an embodiment of a temperature control device for a printer of the present invention, FIG. 2 is a view showing a temperature distribution of a printing head of a conventional example, and FIG. 3 is a time chart showing the operation of the embodiment. FIG. 4 is a circuit diagram showing the temperature control device. 1 ... Printing head, 4 ... Temperature detector, 5 ... Voltage converter, 6
… Temperature rise protection circuit, 7… Current detector, 8… Adder, Q 1
... comparator, V A , V REF ... reference voltage, T ... protection circuit operation start temperature, RC ... integration circuit.
Claims (1)
と、温度上昇保護回路の動作により、印刷を一時的に停
止し、あるいは印刷速度を低下させて温度制御を行なう
プリンタの温度コントロール方法において、 印刷ヘツドの発熱量を検出し、 検出された発熱量に応じて温度上昇保護回路の動作開始
温度をコントロールすることを特徴とするプリンタの温
度コントロール方法。1. A temperature control method for a printer, wherein when the temperature of a print head rises above a certain value, a temperature rise protection circuit operates to temporarily stop printing or reduce the printing speed to perform temperature control. A temperature control method for a printer, which detects the heat generation amount of the print head and controls the operation start temperature of the temperature rise protection circuit according to the detected heat generation amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27701285A JPH0657459B2 (en) | 1985-12-11 | 1985-12-11 | Printer temperature control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27701285A JPH0657459B2 (en) | 1985-12-11 | 1985-12-11 | Printer temperature control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62138259A JPS62138259A (en) | 1987-06-22 |
| JPH0657459B2 true JPH0657459B2 (en) | 1994-08-03 |
Family
ID=17577532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27701285A Expired - Lifetime JPH0657459B2 (en) | 1985-12-11 | 1985-12-11 | Printer temperature control method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0657459B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2661063B2 (en) * | 1987-09-24 | 1997-10-08 | アイシン精機株式会社 | Thermal head protection device |
| JPH05531A (en) * | 1990-08-29 | 1993-01-08 | Mita Ind Co Ltd | Image forming device |
| JPH0818440B2 (en) * | 1992-09-21 | 1996-02-28 | 日本電気データ機器株式会社 | Thermal head |
-
1985
- 1985-12-11 JP JP27701285A patent/JPH0657459B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62138259A (en) | 1987-06-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |