JPS6192876A - System for detecting temperature of printing head - Google Patents
System for detecting temperature of printing headInfo
- Publication number
- JPS6192876A JPS6192876A JP59213654A JP21365484A JPS6192876A JP S6192876 A JPS6192876 A JP S6192876A JP 59213654 A JP59213654 A JP 59213654A JP 21365484 A JP21365484 A JP 21365484A JP S6192876 A JPS6192876 A JP S6192876A
- Authority
- JP
- Japan
- Prior art keywords
- print head
- temperature
- printing
- detection
- detection circuit
- 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.)
- Pending
Links
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
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/377—Cooling or ventilating arrangements
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、ワイヤドツト印刷ヘッド等の印字ヘッドの駆
動により発熱した励磁コイルが焼損危険温度に達する前
に検知して、焼損を防止するための印字ヘッドの温度検
出方式に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method for preventing burnout by detecting excitation coils generated by driving a print head such as a wire dot print head before the excitation coil reaches a temperature dangerous for burnout. This invention relates to a print head temperature detection method.
ワイヤドツトインパクト型プリンタの印字ヘッドには、
一般的に励磁コイルが用いられ、このコイルに電流を流
してその電磁力によって印字（ドツト）ビンを動作させ
、印字を行うものである。The print head of a wire dot impact printer has
Generally, an excitation coil is used, and when a current is passed through this coil, the resulting electromagnetic force operates a printing (dot) bottle to perform printing.
このような印字ヘッドによって印字を行うと、コイルに
流れる電流によってコイル自体が発熱し始める。近年プ
リンタの高速化と印字ヘッドの高密度化に伴ないこの発
熱量は比較的大きく、黒の部分の多いヘビーデユーティ
−の印字パターンを長時間印字すると、コイルは徐々に
温度上昇し、最後には、コイルの焼損が生じてしまう。When printing is performed using such a print head, the coil itself begins to generate heat due to the current flowing through the coil. In recent years, as printers have become faster and print heads have become more dense, the amount of heat generated is relatively large, and when printing a heavy-duty print pattern with many black areas for a long time, the temperature of the coil gradually increases and In this case, the coil will burn out.
このため、コイルの温度上昇を検出し、係る事態を防ぐ
べく、印字を休止させることが行なわれている。For this reason, printing is stopped in order to detect the rise in temperature of the coil and prevent such a situation.
このような温度検出のため、従来印字へノドに感熱素子
を設けていた。第５図は従来のワイヤドツトプリンタの
構成図であり、例えば２４ピンの印字ヘッド１内に感熱
素子２が設けられており、印字ヘッドｌの温度を検出す
る。コンピュータ等からの印字コマンド、データはイン
ターフェイス制御部６を介しマイクロプロセッサで構成
された主制御部７へ送られる。主制御部７は印字データ
を印字制御部５へ送り、印字制御部５は印字へノドｌの
各ヘッドピンに対応する励磁コイルを駆動制御する。又
、主制御部７は印字へノド１を搭載したキャリッジを用
紙のスペース方向に移動させるスペースモータ１）をス
ペース制御部９を介し駆動制御して、キャリッジ、即ち
印字ヘッド１をスペース移動及びキャリッジリターンさ
せ、更に用紙を改行方向に送る改行モータ１０を改行制
御部８を介し駆動制御し、改行動作を行なわしめる。In order to detect such temperature, a heat-sensitive element has conventionally been provided at the printing throat. FIG. 5 is a block diagram of a conventional wire dot printer. For example, a 24-pin print head 1 is provided with a thermal element 2 for detecting the temperature of the print head 1. As shown in FIG. Print commands and data from a computer or the like are sent via an interface control section 6 to a main control section 7 comprised of a microprocessor. The main controller 7 sends print data to the print controller 5, and the print controller 5 drives and controls the excitation coils corresponding to each head pin of the nozzle 1 for printing. In addition, the main control unit 7 drives and controls the space motor 1) that moves the carriage carrying the printing gutter 1 in the space direction of the paper via the space control unit 9 to move the carriage, that is, the print head 1 into the space and move the carriage. The line feed motor 10 that sends the paper in the line feed direction is driven and controlled via the line feed control section 8 to carry out the line feed operation.
一方、印字ヘッドｌの各コイルに与えられる電源電圧は
駆動されるコイルの個数によって変動するから、これに
よる印字エネルギーのバラツキを補正するため、電源電
圧検出回路３と励磁時間設定部４とが設けられ、電源電
圧検出回路３で検出された電源電圧レベルＶｌ、Ｖ２、
Ｖ３に応じて励磁時間設定部４が印字ヘッド１に与える
コイル励磁信号ＰＤＴＭＯ幅（励磁時間）を変えて印字
へノド１の各コイルを励磁駆動する。On the other hand, since the power supply voltage applied to each coil of the print head l varies depending on the number of driven coils, a power supply voltage detection circuit 3 and an excitation time setting section 4 are provided in order to correct the variation in printing energy caused by this. and the power supply voltage levels Vl, V2, detected by the power supply voltage detection circuit 3
The excitation time setting section 4 changes the width (excitation time) of the coil excitation signal PDTMO given to the print head 1 in accordance with V3 to excite and drive each coil of the throat 1 for printing.
このような従来のワイヤドツトプリンタでは、感熱素子
２が印字へノド１の温度検出を行ない、所定の危険温度
に達すると、危険信号が印字制御部５へ与えられ、これ
によって印字制御部５は１行印字する毎に休止時間を設
けたり、１行の印字をいくつかに分割して間に休止時間
を設けて印字するなどの制御を行って印字へノド１が自
然冷却によりこれ以上の温度に上昇しないようにして焼
損を防止している。In such a conventional wire dot printer, the thermal element 2 detects the temperature of the printing nozzle 1, and when the temperature reaches a predetermined dangerous temperature, a danger signal is given to the printing control section 5. Controls such as providing a pause time each time a line is printed, or dividing one line of printing into several parts and printing with a pause time in between, are performed to prevent the printing gutter 1 from reaching a temperature higher than this due to natural cooling. This prevents burnout by preventing it from rising.
このような従来の感熱素子による方法では、印字ヘッド
１内にコイルに近づけて設けることは、実装上困難で、
ある程度能れた位置に取付けられている。このため、コ
イル自体の温度と感熱素子２付近の温度とは誤差が生ず
る。この誤差は、比較的に低いデユーティのパターン（
黒が多（ないパターン）を長時間印字する場合では、第
６図（Ａ）の温度分布の時間的推移図に示す如く、コイ
ルはＬ Ｈ−ｔ ２−ｔ ３→ｔ４と徐々に上昇してい
き、コイル周囲も徐々に温度上昇するため、コイルと感
熱素子２との温度差は少なく、コイルの焼損前のコイル
危険温度ＴＡより若干低い検知温度ＴＢを感熱素子２に
設定しておけばよい。In such a conventional method using a heat-sensitive element, it is difficult to install it in the print head 1 close to the coil.
It is installed in a position where it can be used to some extent. Therefore, an error occurs between the temperature of the coil itself and the temperature near the heat-sensitive element 2. This error is caused by a relatively low duty pattern (
When printing a pattern with a lot of black (a pattern with no black) for a long time, the temperature of the coil gradually increases from L H-t 2-t 3 to t4, as shown in the time course diagram of temperature distribution in Figure 6 (A). Since the temperature around the coil also gradually rises, the temperature difference between the coil and the heat-sensitive element 2 is small, and if the detection temperature TB is set for the heat-sensitive element 2, which is slightly lower than the dangerous coil temperature TA before the coil burns out. good.
しかしながら、第６図（Ｂ）の如く黒が多いヘビーデユ
ーティパターンの印字の場合には、はとんど全てのピン
が連続的に駆動されるため、コイルの温度上昇のスピー
ドが早く、感熱素子２の周囲が検知温度ＴＢとなってい
なくても既にコイルではコイル危険温度ＴＡを越えてし
まうことがあり、このような場合、印字制御部５に危険
信号が未だ送られていないのでそのままヘビーデユーテ
ィパターンを印字し続けてコイルが焼損してしまうとい
う事態が生じるという問題があった。However, when printing a heavy-duty pattern with a lot of black as shown in Figure 6 (B), all the pins are driven continuously, so the temperature of the coil increases quickly and the temperature is not sensitive to heat. Even if the temperature around the element 2 has not reached the detection temperature TB, the coil may already exceed the coil dangerous temperature TA. In such a case, the danger signal has not yet been sent to the printing control unit 5, so the heavy There was a problem in that the coil was burned out due to continuous printing of the duty pattern.
本発明は、感熱素子を用いずに印字ヘッドの温度検出を
容易に行なうことのできる印字ヘッドの温度検出方式を
提供するにある。An object of the present invention is to provide a print head temperature detection method that can easily detect the temperature of the print head without using a thermal element.
このため、本発明は、複数の励磁コイルを有する印字ヘ
ッドと、該印字ヘッドに供給される電源電圧のレベルを
検出する電源電圧検出回路と、該印字ヘッドの印字動作
中に該電源電圧検出回路の検出レベル信号に応じた重み
を該検出レベル信号の出力期間中積算して該印字ヘッド
の温度を検出する温度検出回路とを有、し、該温度検出
回路の検出温度によって該印字ヘッドの温度検出を行う
こ゛とを特徴としている。Therefore, the present invention provides a print head having a plurality of excitation coils, a power supply voltage detection circuit that detects the level of the power supply voltage supplied to the print head, and a power supply voltage detection circuit that detects the level of the power supply voltage supplied to the print head. and a temperature detection circuit that detects the temperature of the print head by integrating weights corresponding to the detection level signal during the output period of the detection level signal, and detects the temperature of the print head based on the temperature detected by the temperature detection circuit. It is characterized by the fact that it performs detection.
本発明では、電源電圧検出回路の検出レベルが電源電圧
の変動、即ち励磁するコイルの個数に応じて変化し、従
ってコイルの発熱量に比例することから、この検出レベ
ルによって温度検出回路が印字ヘッドの温度を推定検出
するようにして、感熱素子を設けずに容易に印字ヘッド
の温度検出を行なうものである。In the present invention, the detection level of the power supply voltage detection circuit changes in accordance with fluctuations in the power supply voltage, that is, the number of excited coils, and is therefore proportional to the amount of heat generated by the coils. The temperature of the print head can be easily detected without providing a heat-sensitive element by estimating the temperature of the print head.
以下、本発明を実施例により詳細に説明する。 Hereinafter, the present invention will be explained in detail with reference to Examples.
第１図は本発明の一実施例ブロック図であり、図中、第
５図で示したものと同一のものは同一の記号で示してあ
り、１２はアンプカウントパルスセレクタ（以下セレク
タと称す）であり、電源電圧検出回路３の検出レベルＶ
ｌ、Ｖ２、■３に応じて異なる周波数のアップパルスＰ
Ｕ１、ＰＵ２、ＰＵ３を選択し出力するもの、１３はア
ンプダウンカウンタであり、セレクタ１２からのアンプ
パルスをアンプカウントし、後述するダウンパルスをダ
ウンカウントして、温度をカウント値として示すもの、
１４は比較回路であり、アップダウンカウンタ１３のカ
ウント値として所定の検知温度に対応する設定値とを比
較し、危険信号（アラーム）を発するためのもの、１５
はアンドゲートであり、印字制御部５からの印字動作中
信号ＰＲｉＮＴによって開き、セレクタ１２からのアッ
プパルスをアンプダウンカウンタ１３に与えるもの、１
６は反転回路であり、印字動作中信号ＰＲｉＮＴの論理
を反転するもの、１７はアンドゲートであり、反転回路
１６からの反転信号ＰＲｉＮＴによって開き、ダウンパ
ルスＰＤＩをアンプダウンカウンタ１３に供給するもの
であり、これらによって温度検出回路ＴＳＣを構成する
。FIG. 1 is a block diagram of an embodiment of the present invention. In the diagram, the same components as those shown in FIG. , and the detection level V of the power supply voltage detection circuit 3 is
Up pulse P with different frequencies depending on l, V2, ■3
A device that selects and outputs U1, PU2, and PU3; 13 is an amplifier down counter that counts the amplifier pulses from the selector 12, counts down the down pulses to be described later, and indicates the temperature as a count value;
14 is a comparison circuit, which compares the count value of the up/down counter 13 with a set value corresponding to a predetermined detected temperature and issues a danger signal (alarm); 15;
1 is an AND gate which is opened by the print operation signal PRiNT from the print control unit 5 and gives the up pulse from the selector 12 to the amplifier down counter 13;
6 is an inversion circuit which inverts the logic of the printing operation signal PRiNT; 17 is an AND gate which is opened by the inversion signal PRiNT from the inversion circuit 16 and supplies a down pulse PDI to the amplifier down counter 13; These constitute the temperature detection circuit TSC.
次に、第１図実施例構成の動作について、第２図、第３
図及び第４図の動作説明図を用いて説明する。Next, regarding the operation of the embodiment configuration shown in FIG.
This will be explained using the operation explanatory diagram of FIG.
先づ、電源電圧検出回路３の動作について説明すると、
第２図に示す如く電源電圧ＶＨの変動に従い、検出レベ
ル信号Ｖｌ、Ｖ２、Ｖ３を出力する。この電源電圧ＶＨ
は印字へソド１のコイルの電源電圧であり、印字データ
に従って励磁されるピン（コイル）の個数によって変動
する。この検出レベル信号Ｖｌ、Ｖ２、Ｖ３は前述した
如（、電源電圧の変動による印字エネルギーの変動を防
止するため、ピン（コイル）の励磁時間を変化させるた
め励磁時間設定部４に与えられるものである。First, the operation of the power supply voltage detection circuit 3 will be explained.
As shown in FIG. 2, detection level signals Vl, V2, and V3 are output according to fluctuations in power supply voltage VH. This power supply voltage VH
is the power supply voltage of the coil of the print head 1, which varies depending on the number of pins (coils) excited according to print data. These detection level signals Vl, V2, and V3 are given to the excitation time setting section 4 in order to change the excitation time of the pin (coil) in order to prevent fluctuations in printing energy due to fluctuations in power supply voltage, as described above. be.
一方、この電源電圧検出回路３の検出レベルＶ１、Ｖ２
、■３は、印字ヘッド１ （のコイル）の発熱と次のよ
うな関係にある。即ち、電源電圧■Ｈが最も高いレベル
にあり検出レベル■ｌが出力されているときは、印字ヘ
ッド１の負荷は小さく、即ち励磁しているコイルの数は
少ないから、印字へソド１の発熱は最も小さい。逆に電
源電圧ＶＨが最も低いレベルにあり検出レベル■３が出
力されているときは、印字ヘッド１の負荷は大きく、即
ち励磁しているコイルの数は最も多く、印字ヘッド１の
発熱は最も大きい。更に電源電圧ＶＨがこれらの中間の
レベルにあり、検出レベル■２が出力されているときは
、印字ヘッド１の負荷は中間で、即ち励磁しているコイ
ルの数もこれらの中間であり、印字ヘッド１の発熱も中
間である。On the other hand, the detection levels V1 and V2 of this power supply voltage detection circuit 3
, ■3 have the following relationship with the heat generation of the print head 1 (its coil). That is, when the power supply voltage ■H is at the highest level and the detection level ■l is output, the load on the print head 1 is small, that is, the number of excited coils is small, so the heat generated by the print head 1 is reduced to the print head. is the smallest. Conversely, when the power supply voltage VH is at the lowest level and detection level ■3 is output, the load on the print head 1 is large, that is, the number of excited coils is the largest, and the print head 1 generates the least amount of heat. big. Furthermore, when the power supply voltage VH is at a level between these levels and detection level ■2 is output, the load on the print head 1 is at an intermediate level, that is, the number of excited coils is also at an intermediate level, and printing is not possible. The heat generation of the head 1 is also in the middle.
このように、電源電圧検出回路３の検出レベルｖ、−Ｖ
３と印字ヘッド１との発熱とは相関があり、本発明はこ
の検出レベルＶ１〜Ｖ３によって印字ヘッド１の温度を
検出しようとするものである。In this way, the detection levels v, -V of the power supply voltage detection circuit 3
3 and the heat generation of the print head 1, and the present invention attempts to detect the temperature of the print head 1 based on these detection levels V1 to V3.
先づ、電源電圧検出回路３の出力検出レベルＶ１〜■３
に対応する発熱量に応じて重み付けを付するためセレク
タ１２が用いられる。First, the output detection levels V1 to ■3 of the power supply voltage detection circuit 3
A selector 12 is used for weighting according to the amount of heat generated.
セレクタ１２には、アンプパルスとして各々周波数ｆ＋
、ｆｚ、ｆｚ （Ｉ３＞ｆｚ＞ｆ＋）のアップパルス
ＰＵＩ、ＰＵ２、ＰＵ３が入力されており、検出レベル
Ｖｌ〜■３に応じてアンプパルスＰＵＩ、ＰＵ２、ＰＵ
３が出力される。即ち、検出レベルＶ＋には最も発熱量
が少ないことを示す最も低い周波数ｆｌのアップパルス
Ｐ ［Ｊ １がセレクトされ、検出レベル■２には中間
の発熱量を示す中間の周波数ｆ２のアップパルスＰ ［
Ｊ ２がセレクトされ、検出レベル■３には最も発熱量
が多いことを示す最も高い周波数１３のアンプパルスＰ
Ｕ３がセレクトされ、各検出レベル■１〜■３の出力期
間中これらセレクトされたアップパルスを出力する。The selector 12 has each frequency f+ as an amplifier pulse.
, fz, fz (I3>fz>f+) up pulses PUI, PU2, PU3 are input, and the amplifier pulses PUI, PU2, PU according to the detection level Vl~■3
3 is output. That is, the up-pulse P[J1 of the lowest frequency fl indicating the lowest amount of heat generation is selected for the detection level V+, and the up-pulse P of the intermediate frequency f2 indicating the intermediate amount of heat generation is selected for the detection level ■2. [
J2 is selected, and the detection level ■3 is the amplifier pulse P of the highest frequency 13, which indicates the highest amount of heat generation.
U3 is selected and outputs these selected up pulses during the output period of each detection level (1) to (3).
一方、前述の検出レベルＶ＋−Ｖ３とコイルの発熱量と
の相関は印字動作中のみ有効であるから、印字制御部５
が印字動作中（即ち、印字ヘッド１が駆動されている間
）に“１″、印字していない非印字動作中に“０”とな
る印字動作中信号ＰＲｉＮＴを発生し、アンドゲート１
５を印字動作中のみ開き、セレクタ１２からのアップパ
ルスをアンプカウンタ１３に導く。このアンドゲート１
５は、セレクタ１２の前段に設け、検出レベルＶｌ〜■
３のセレクタ１２への入力制御を行ってもよい。従って
、第２図に示す如く、印字動作中はアンドゲート１５か
ら出力される検出レベル■１〜ｖ３に応じたアソプパ／
１．スＰＵＩ、ＰＯ２、ＰＯ３が各検出レベルの期間中
発生するアンプパルスＰＵが出力されることになる。On the other hand, since the above-mentioned correlation between the detection level V+-V3 and the amount of heat generated by the coil is valid only during printing operation, the printing control unit 5
generates a printing operation signal PRiNT which is "1" during a printing operation (that is, while the print head 1 is being driven) and "0" during a non-printing operation, and the AND gate 1
5 is opened only during printing operation, and the up pulse from the selector 12 is guided to the amplifier counter 13. This and gate 1
5 is provided before the selector 12, and detects the detection level Vl~■
Input control to the selector 12 of No. 3 may also be performed. Therefore, as shown in FIG.
1. The amplifier pulse PU generated during the period when the signals PUI, PO2, and PO3 are at each detection level is output.
第３図に示す様に印字動作中アップダウンカウンタ１３
は検出レベルＶ＋の時に最もカウントアンプのスピード
が遅く、検出レベルＶ３の時に最もカウントアンプのス
ピードが速くなり、発熱量に応じた重みのアンプパルス
ＰＵを積算していく。As shown in Figure 3, the up/down counter 13 is displayed during printing operation.
When the detection level is V+, the speed of the count amplifier is the slowest, and when the detection level is V3, the speed of the count amplifier is the fastest, and the amplifier pulses PU with weights corresponding to the amount of heat generated are integrated.
印字が終了し、印字中信号ＰＲｉＮＴが“０”となると
、アンドゲート１５が閉じ、アップダウンカウンタ１３
へのアップパルスＰＵの入力が禁止され、逆に反転回路
１６で反転された印字中信号ＰＲｉＮＴによってアンド
ゲート１７が開く。When printing is completed and the printing signal PRiNT becomes "0", the AND gate 15 closes and the up/down counter 13
The input of the up pulse PU to is prohibited, and the AND gate 17 is opened by the printing signal PRiNT inverted by the inverting circuit 16.
これによってアップダウンカウンタ１３のカウントダウ
ン端子にダウンパルスＰＤＩが入力される。As a result, the down pulse PDI is input to the countdown terminal of the up/down counter 13.
ダウンパルスＰＤＩは、印字体止中は印字へソド１が自
然冷却によって冷却されるから、休止中に積算された計
数値、即ち印字ヘッドｌの温度を冷却分減少するもので
あり、その周波数ｆ４はこの冷却の程度に応じて選択さ
れる。従ってアップダウンカウンタ１３は、印字体止中
にダウンパルスＰＣＩを積算値からダウンカウントする
。Since the printing head 1 is cooled by natural cooling while the printing body is at rest, the down pulse PDI reduces the counted value accumulated during the pause, that is, the temperature of the print head 1 by the amount of cooling, and its frequency f4 is selected depending on the degree of cooling. Therefore, the up/down counter 13 counts down the down pulse PCI from the integrated value while the print is stopped.
このようにしてアップダウンカウンタ１３のカウント値
は、印字ヘッドｌの発熱状態（温度）を示すことになる
。In this way, the count value of the up/down counter 13 indicates the heat generation state (temperature) of the print head l.
このようにして、第４図に示す如く印字、休止を繰返し
、アップダウンカウンタ１３のカウント値が変化し、一
方、比較回路１４は予じめ定められた検知温度に対応す
る比較値（設定値）とアップダウンカウンタ１３のカウ
ント値を比較している。そして比較回路１４はこのカウ
ント値が比較値を越えると、危険信号ＡＬＡＲＭを出力
する。In this way, printing and pausing are repeated as shown in FIG. ) and the count value of the up/down counter 13 are compared. When the count value exceeds the comparison value, the comparison circuit 14 outputs a danger signal ALARM.
これは印字ヘッドｌが焼損危険温度になったことを示し
、この危険信号ＡＬＡＲＭは印字制御部５へ与えられる
。印字制御部５では、従来と同様にこれによって印字と
印字との間に冷却のための休止時間を設ける等の印字制
御を行ない、コイルの焼損を防止する。This indicates that the print head l has reached a dangerous temperature for burnout, and this danger signal ALARM is given to the print control section 5. The printing control section 5 performs printing control, such as providing a cooling down time between printings, in the same manner as in the prior art, thereby preventing burnout of the coil.
上述の検出レベルＶ＋〜■３の重み（即ちパルス周波数
）は、プリンタの周囲温度に応じて変更すると、更に精
度のよい温度検出が可能となり、例えば温度センサを設
けて、プリンタの周囲温度を測定し、重みであるアップ
パルスＰＵＩ、ＰＯ２、ＰＯ３及びダウンパルスＰＤＩ
の周波数を補正すればよく、周囲温度が高くなるにつれ
周波数を高くする。If the weights (i.e., pulse frequencies) of the above-mentioned detection levels V+ to ■3 are changed according to the ambient temperature of the printer, more accurate temperature detection becomes possible.For example, by installing a temperature sensor to measure the ambient temperature of the printer. and the weights are up pulse PUI, PO2, PO3 and down pulse PDI.
The frequency should be corrected, and the frequency should be increased as the ambient temperature rises.
以上本発明を一実施例により説明したが、本発明は本発
明の主旨に従い種々の変形が可能であり、本発明からこ
れらを排除するものではない。Although the present invention has been described above using one embodiment, the present invention can be modified in various ways according to the gist of the present invention, and these are not excluded from the present invention.
以上説明した様に、本発明によれば、複数の励磁コイル
を有する印字ヘッドと、該印字ヘッドに供給される電源
電圧のレベルを検出する電源電圧検出回路と、該印字ヘ
ッドの印字動作中に該電源電圧検出回路の検出レベル信
号に応じた重みを該検出レベル信号の出力期間中積算し
て該印字ヘッドの温度を検出する温度検出回路とを有し
、該温度検出回路の検出温度によって該印字ヘッドの温
度検出を行うことを特徴としているので、感熱素子を設
けなくても印字ヘッドの温度検出が可能となり、バラツ
キがなく誤差の少ない温度検出が可能となるという効果
を奏する。又、発熱ごと相関関係にある電源電圧検出回
路の検出レベル信号を用いているので、精度の高い温度
検出が可能となるという効果を奏する他に温度検出回路
の構成も、既存の検出レベル信号を用いているから簡単
であリ、安価にしかも容易に実現できるという実用上優
れた効果も奏する。As described above, according to the present invention, there is provided a print head having a plurality of excitation coils, a power supply voltage detection circuit that detects the level of the power supply voltage supplied to the print head, and a power supply voltage detection circuit that detects the level of the power supply voltage supplied to the print head. a temperature detection circuit that detects the temperature of the print head by integrating weights corresponding to the detection level signal of the power supply voltage detection circuit during the output period of the detection level signal; Since it is characterized by detecting the temperature of the print head, it is possible to detect the temperature of the print head without providing a heat-sensitive element, and the temperature can be detected without variation and with few errors. In addition, since the detection level signal of the power supply voltage detection circuit, which has a correlation with each heat generation, is used, it not only has the effect of enabling highly accurate temperature detection, but also the configuration of the temperature detection circuit is similar to the existing detection level signal. Since it is used, it is simple, and has excellent practical effects such as being inexpensive and easy to implement.
【図面の簡単な説明】
第１図は本発明の一実施例ブロック図、第２図は第１図
実施例構成の要部波形図、第３図は第１図実施例構成の
積算動作説明図、第４図は第１図実施例構成の比較動作
説明図、第５図は従来の温度検出構成図、第６図は第５
図構成の動作説明図である。
図中、１−印字ヘッド、３−電源電圧検出回路、ＴＳＣ
一温度検出回路、１２−重み用セレクタ、１３−アップ
ダウンカウンタ、１４・−比較回路。[Brief Description of the Drawings] Figure 1 is a block diagram of an embodiment of the present invention, Figure 2 is a waveform diagram of main parts of the configuration of the embodiment in Figure 1, and Figure 3 is an explanation of the integration operation of the configuration of the embodiment in Figure 1. 4 is a comparative operation explanatory diagram of the configuration of the embodiment shown in FIG. 1, FIG. 5 is a diagram of the conventional temperature detection configuration, and FIG.
It is an explanatory diagram of the operation of the diagram configuration. In the figure, 1-print head, 3-power supply voltage detection circuit, TSC
1 - temperature detection circuit, 12 - weight selector, 13 - up/down counter, 14 - comparison circuit.
Claims (3)
ヘッドに供給される電源電圧のレベルを検出する電源電
圧検出回路と、該印字ヘッドの印字動作中に該電源電圧
検出回路の検出レベル信号に応じた重みを該検出レベル
信号の出力期間中積算して該印字ヘッドの温度を検出す
る温度検出回路とを有し、該温度検出回路の検出温度に
よって該印字ヘッドの温度検出を行うことを特徴とする
印字ヘッドの温度検出方式。(1) A print head having a plurality of excitation coils, a power supply voltage detection circuit that detects the level of the power supply voltage supplied to the print head, and a detection level signal of the power supply voltage detection circuit during the printing operation of the print head. and a temperature detection circuit that detects the temperature of the print head by integrating weights corresponding to the detection level signal during the output period of the detection level signal, and detects the temperature of the print head based on the temperature detected by the temperature detection circuit. Features a print head temperature detection method.
波数のパルスを発生するパルス発生回路と、該発生した
パルスを前記印字動作中に計数するカウンタとで構成さ
れていることを特徴とする特許請求の範囲第（１）項記
載の印字ヘッドの温度検出方式。(2) The temperature detection circuit is characterized by comprising a pulse generation circuit that generates pulses with a frequency corresponding to the detection level, and a counter that counts the generated pulses during the printing operation. A temperature detection method for a print head according to claim (1).
計数値からダウンカウントすることを特徴とする特許請
求の範囲第（２）項記載の印字ヘッドの温度検出方式。(3) The print head temperature detection method according to claim (2), wherein the counter counts down from a counted value during non-printing operation of the print head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59213654A JPS6192876A (en) | 1984-10-12 | 1984-10-12 | System for detecting temperature of printing head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59213654A JPS6192876A (en) | 1984-10-12 | 1984-10-12 | System for detecting temperature of printing head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6192876A true JPS6192876A (en) | 1986-05-10 |
Family
ID=16642741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59213654A Pending JPS6192876A (en) | 1984-10-12 | 1984-10-12 | System for detecting temperature of printing head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6192876A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0505154A2 (en) * | 1991-03-20 | 1992-09-23 | Canon Kabushiki Kaisha | Thermal ink jet recording head temperature control |
| US5302033A (en) * | 1991-03-26 | 1994-04-12 | Citizen Watch Co., Ltd. | Burning damage protecting apparatus and method for a printing head in a printer |
| US5559535A (en) * | 1991-03-20 | 1996-09-24 | Canon Kabushiki Kaisha | Temperature control of ink-jet recording head using heat energy |
| US6116709A (en) * | 1991-08-01 | 2000-09-12 | Canon Kabushiki Kaisha | Ink jet recording apparatus with temperature calculation based on prestored temperature data |
-
1984
- 1984-10-12 JP JP59213654A patent/JPS6192876A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0505154A2 (en) * | 1991-03-20 | 1992-09-23 | Canon Kabushiki Kaisha | Thermal ink jet recording head temperature control |
| US5559535A (en) * | 1991-03-20 | 1996-09-24 | Canon Kabushiki Kaisha | Temperature control of ink-jet recording head using heat energy |
| US5946007A (en) * | 1991-03-20 | 1999-08-31 | Canon Kabushiki Kaisha | Temperature control of ink-jet recording head using heat energy |
| EP0997287A3 (en) * | 1991-03-20 | 2000-05-17 | Canon Kabushiki Kaisha | Temperature control of ink-jet recording head using heat energy |
| US5302033A (en) * | 1991-03-26 | 1994-04-12 | Citizen Watch Co., Ltd. | Burning damage protecting apparatus and method for a printing head in a printer |
| US6116709A (en) * | 1991-08-01 | 2000-09-12 | Canon Kabushiki Kaisha | Ink jet recording apparatus with temperature calculation based on prestored temperature data |
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