JPH03193367A - Thermal recorder - Google Patents
Thermal recorderInfo
- Publication number
- JPH03193367A JPH03193367A JP1332580A JP33258089A JPH03193367A JP H03193367 A JPH03193367 A JP H03193367A JP 1332580 A JP1332580 A JP 1332580A JP 33258089 A JP33258089 A JP 33258089A JP H03193367 A JPH03193367 A JP H03193367A
- Authority
- JP
- Japan
- Prior art keywords
- thermal head
- printing time
- resistor
- current flowing
- resistance
- 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
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 230000002159 abnormal effect Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
Landscapes
- Electronic Switches (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、ファクシミリ、プリンタなどのサーマルヘッ
ドを使用した感熱記録装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a thermal recording device using a thermal head, such as a facsimile machine or a printer.
（従来の技術）
従来のサーマルヘッドを使用した感熱記録装置は、電源
に対して並列に多数接続した発熱抵抗体をサーマルヘッ
ドに設け、印字データと発熱抵抗体の発熱時間を制御す
るストローブ信号とに基づいて発熱抵抗体を適宜に発熱
させ、記録紙に印字を行う構成である。(Prior art) A thermal recording device using a conventional thermal head is equipped with a large number of heating resistors connected in parallel to a power supply, and the print data and a strobe signal that controls the heat generation time of the heating resistors are connected to the thermal head. The configuration is such that the heating resistor is made to generate heat appropriately based on the information, and printing is performed on recording paper.
（発明が解決しようとする課題）
上記の従来装置では、制御側の誤動作、故障などにより
、印字時間以外にもストローブ信号がサーマルヘッドに
印加され続けることがあり、発熱抵抗体の過熱、焼損を
引き起こし、サーマルヘッドの損傷、故障の原因となる
という問題があった。(Problems to be Solved by the Invention) In the conventional device described above, a strobe signal may continue to be applied to the thermal head outside of the printing time due to a malfunction or failure on the control side, which may cause overheating and burnout of the heating resistor. This poses a problem in that it causes damage to the thermal head and malfunction.
本発明の目的は、サーマルヘッドの損傷、故障を未然に
防ぐことができる感熱記録装置を提供することにある。An object of the present invention is to provide a thermal recording device that can prevent damage and failure of the thermal head.
（課題を解決するための手段）
上記の目的を達成するため、本発明は、印字データにノ
、（づいて発熱して記録紙に印字を行うサーマルヘッド
と、サーマルヘッドの供給電源に設けられた抵抗と、抵
抗による電圧降下により印字時間外にサーマルヘッドへ
流れる電流を検知する検知手段と、検知手段の検知信号
により前記供給電源をオフにする制御手段とを備えたこ
とを特徴とする。(Means for Solving the Problems) In order to achieve the above object, the present invention provides a thermal head that generates heat for printing data and prints on recording paper, and a power supply for the thermal head. The present invention is characterized by comprising a resistor, a detecting means for detecting a current flowing to the thermal head outside of printing time due to a voltage drop due to the resistor, and a control means for turning off the power supply in response to a detection signal from the detecting means.
（作 用）
上記の手段を採用したため、印字時間外にサーマルヘッ
ドへ異常な電流が流れると、このことが検知手段によっ
て検知され、この検知信号により制御手段がサーマルヘ
ッドの供給電源をオフにし、サーマルヘッドを焼損させ
るような電流がサーマルヘッドに流れることを防止する
。(Function) Since the above means is adopted, if an abnormal current flows to the thermal head outside the printing time, this will be detected by the detection means, and this detection signal will cause the control means to turn off the power supply to the thermal head. To prevent current from flowing into a thermal head that would cause it to burn out.
（実施例） 以下、本発明の実施例を図面に基づいて説明する。(Example) Embodiments of the present invention will be described below based on the drawings.
第１図は本発明の感熱記録装置をファクシミリ装置に適
用した一実施例の構成図であり、１は供給電源、２は供
給電源１に設けられたリレーなどのスイッチ、３と４と
は供給電源１に並列に接続され、かつ装置を構成する各
部材を動作させるソレノイドとステッピングモータ、５
は供給電源１と並列に接続された出力線１ａに設けられ
たサーマルヘッド、６は出力線１ａに対して並列に多数
接続された発熱抵抗体、７は発熱抵抗体６に直列に接続
されたスイッチングトランジスタ、８は出力線１ａに直
列に接続された抵抗、９は抵抗８の近傍の出力線１ａに
並列に接続された発光ダイオード、１０は発光ダイオー
ド９に直列に接続されたツェナーダイオード、１１は発
光ダイオード９から発する光を受光するフォトトランジ
スタ、１２ａ。FIG. 1 is a configuration diagram of an embodiment in which the thermal recording device of the present invention is applied to a facsimile machine, in which 1 is a power supply, 2 is a switch such as a relay provided in the power supply 1, and 3 and 4 are power supplies. a solenoid and a stepping motor that are connected in parallel to the power source 1 and operate each member that constitutes the device;
is a thermal head provided on the output line 1a connected in parallel to the power supply 1, 6 is a heating resistor connected in parallel to the output line 1a in large numbers, and 7 is connected in series to the heating resistor 6. A switching transistor, 8 a resistor connected in series to the output line 1a, 9 a light emitting diode connected in parallel to the output line 1a near the resistor 8, 10 a Zener diode connected in series to the light emitting diode 9, 11 12a is a phototransistor that receives light emitted from the light emitting diode 9;
１２ｂは保護抵抗、１３は網制御装置（ＮＣＵ）、１４
はモデム、１５は表示部、１６は前記スイッチ２．サー
マルヘッド５．モデム１４９表示部１５をコントロール
する制御手段（ＣＰＵ：中央演算ユニット）であって、
前記発光ダイオード９．ツェナーダイオード１０．フォ
トトランジスタ１１で検知手段を構成している。12b is a protection resistor, 13 is a network control unit (NCU), 14
1 is a modem, 15 is a display unit, and 16 is the switch 2. Thermal head 5. A control means (CPU: central processing unit) for controlling the modem 149 display section 15,
The light emitting diode 9. Zener diode 10. The phototransistor 11 constitutes a detection means.
同図において、ソレノイド３．ステッピングモータ４．
サーマルヘッド５の供給電源１は、ＣＰＵ１６からのコ
ントロール信号によりオン、オフされるスイッチ２によ
り電源供給と停止がなされる。In the figure, solenoid 3. Stepping motor 4.
A power supply 1 for the thermal head 5 is turned on and off by a switch 2 which is turned on and off by a control signal from the CPU 16.
サーマルヘッド５では、公知のようにｃｐｕｉｓからの
印字データとストローブ信号（ＳＴＢ）によって、発熱
抵抗体６の印字時間（発熱時間）が制御されて、図示し
ない記録紙に所望の印字が行われる。In the thermal head 5, the printing time (heating time) of the heat generating resistor 6 is controlled by print data from the CPUIS and a strobe signal (STB) as is well known, and desired printing is performed on a recording paper (not shown).
検知手段は、印字時間外に抵抗８に流れる電流を検知す
るためのものであり、抵抗８による電圧降下によりΔ点
の電位がツェナーダイオード１０のツェナー電圧を下回
ると１発光ダイオード９がオフし、これをフォトトラン
ジスタ１１が感知して検知信号としてＣＰＵ１６へ出力
する。そして上記の動作により、印字時間外に電流が抵
抗８を流れていることが検知されると、ＣＰＵ１６は、
スイッチ２を動作して供給電源１をオフにし、表示部■
５に「サーマルヘッド故障」「サーマルヘッド異常」な
どの表示を行わせて操作者に警告を与える。The detection means is for detecting the current flowing through the resistor 8 outside the printing time, and when the potential at the Δ point becomes lower than the Zener voltage of the Zener diode 10 due to the voltage drop caused by the resistor 8, one light emitting diode 9 is turned off. The phototransistor 11 senses this and outputs it to the CPU 16 as a detection signal. Then, when it is detected that the current is flowing through the resistor 8 outside the printing time by the above operation, the CPU 16
Operate switch 2 to turn off power supply 1, and display
5 to display a message such as "thermal head failure" or "thermal head abnormality" to give a warning to the operator.
従って、通常、サーマルヘッド５の焼損による故障がＳ
ＴＢ信号が何等かの原因で印字時間以外に入り続けて、
供給電源１からサーマルヘッド５の電流が流れることに
より生じるので、上記の検知手段を設けることによりサ
ーマルヘッド５の焼損を未然に防止することができる。Therefore, normally, a failure due to burnout of the thermal head 5 is caused by S.
For some reason, the TB signal continues to enter outside of printing time.
This is caused by the current flowing through the thermal head 5 from the power supply 1, so by providing the above detection means, it is possible to prevent the thermal head 5 from burning out.
また抵抗８を供給電源１の一部に設置したことにより、
電流量が多くなるほど（黒字率が高いほど）、サーマル
ヘッド５に供給される電圧が下がってしまうため、ＣＵ
Ｐ１６により印字前に分割印字のブロックごとに黒字率
をカウントし、そのブロックの黒字率に適したＳＴＢ信
号の時間幅（発熱抵抗体６の発熱時間）を変化させて、
均一な濃度の印字を行う。前記ＳＴＢ信号の時間幅は、
黒字率が高いほど長くなるようにＣＰＵ１６で制御され
る。Also, by installing the resistor 8 in a part of the power supply 1,
As the amount of current increases (the higher the surplus rate), the voltage supplied to the thermal head 5 decreases, so the CU
P16 counts the black rate for each block of divided printing before printing, and changes the time width of the STB signal (heating time of the heating resistor 6) suitable for the black rate of that block.
Prints with uniform density. The time width of the STB signal is
It is controlled by the CPU 16 so that the higher the surplus rate is, the longer it is.
上記の本実施例の動作の要部を第２図のフローチャート
を参照して説明する。ＣＰＵ１６で印字前に分割印字の
ブロックごとに黒字率をカウントしく５−１）、そのブ
ロックの黒字率に適したＳＴＢ信号の時間幅をセットし
くＳ −２）、このＳＴＢ信号でサーマルヘッド５の発
熱抵抗体６を発熱させるようにして記録紙へ印字を行う
（Ｓ−３）。この印字時間外には検知手段によって、抵
抗８による電圧降下、すなわちサーマルヘッド５へ電流
が流れているか否かが検知されており、電流が流れてい
ることが検知されなければ（Ｓ−４のＮｏ）、サーマル
ヘッド５は正常であるので次の印字がなされ、また検知
手段によって印字時間外に電流が流れていることが検知
されると（Ｓ−４のＹＥＳ）、サーマルヘッド５には何
等かの異常状態にあるのでスイッチ２をオフにして、供
給電源１をオフ状態にする（Ｓ−５）。同時に表示部１
５にサーマルヘッド５が異常、故障であることを表示す
る（Ｓ−６）。The main part of the operation of the above embodiment will be explained with reference to the flowchart of FIG. Before printing, the CPU 16 should count the black rate for each block of divided printing 5-1) and set the time width of the STB signal suitable for the black rate of that block S-2). Printing is performed on the recording paper by causing the heating resistor 6 to generate heat (S-3). Outside of this printing time, the detection means detects the voltage drop caused by the resistor 8, that is, whether or not current is flowing to the thermal head 5, and if no current is detected (S-4). No), the thermal head 5 is normal, so the next print is made, and if the detection means detects that current is flowing outside of the printing time (S-4: YES), the thermal head 5 does not do anything. Since this is the abnormal state, the switch 2 is turned off to turn off the power supply 1 (S-5). Display section 1 at the same time
5 indicates that the thermal head 5 is abnormal or broken (S-6).
（発明の効果）
本発明によれば、印字時間外にサーマルヘッドに異常な
電流が流れることを検知することができ、サーマルヘッ
ドの損傷、故障を未然に防ぐことができる感熱記録装置
を提供できる。(Effects of the Invention) According to the present invention, it is possible to provide a thermal recording device that can detect abnormal current flowing through the thermal head outside of printing time, and can prevent damage and failure of the thermal head. .
第１図は本発明の感熱記録装置の一実施例の構成図、第
２図は本実施例の動作の要部を示すフローチャートであ
る。
１・・供給電源、 ２・・・スイッチ、 ５・・・サ
ーマルヘッド、 ６・・・発熱抵抗体、 ７・・・スイ
ッチングトランジスタ、 ８・・・抵抗、９ 、１０．
１１・・・検知手段、 １５・・・表示部、１６・・・
制御手段（ＣＰ Ｕ）。FIG. 1 is a block diagram of an embodiment of the thermal recording apparatus of the present invention, and FIG. 2 is a flowchart showing the main part of the operation of this embodiment. DESCRIPTION OF SYMBOLS 1... Power supply, 2... Switch, 5... Thermal head, 6... Heat generating resistor, 7... Switching transistor, 8... Resistor, 9, 10.
11... Detection means, 15... Display unit, 16...
Control means (CPU).
Claims (2)
うサーマルヘッドと、サーマルヘッドの供給電源に設け
られた抵抗と、抵抗による電圧降下により印字時間外に
サーマルヘッドへ流れる電流を検知する検知手段と、検
知手段からの検知信号により前記供給電源をオフにする
制御手段とを備えたことを特徴とする感熱記録装置。(1) The thermal head generates heat based on the print data and prints on the recording paper, the resistor installed in the power supply for the thermal head, and the voltage drop caused by the resistor detects the current flowing to the thermal head outside of printing time. A thermal recording device comprising: a detection means; and a control means for turning off the power supply in response to a detection signal from the detection means.
ントし、この黒字率に基づいて印字時間を変化させて印
字動作を行うように構成したことを特徴とする請求項（
１）記載の感熱記録装置。(2) The control means is configured to count the black rate of the print data and change the printing time based on this black rate to perform the printing operation.
1) The thermosensitive recording device described above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1332580A JPH03193367A (en) | 1989-12-25 | 1989-12-25 | Thermal recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1332580A JPH03193367A (en) | 1989-12-25 | 1989-12-25 | Thermal recorder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03193367A true JPH03193367A (en) | 1991-08-23 |
Family
ID=18256518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1332580A Pending JPH03193367A (en) | 1989-12-25 | 1989-12-25 | Thermal recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03193367A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100354128B1 (en) * | 1998-12-22 | 2002-12-28 | 삼성전자 주식회사 | Circuit for preventing overheat of heater |
| US6738085B2 (en) | 2000-10-30 | 2004-05-18 | Sharp Kabushiki Kaisha | Printing apparatus and communication apparatus and information processing apparatus having the same |
| WO2010066162A1 (en) * | 2008-12-12 | 2010-06-17 | 山东新北洋信息技术股份有限公司 | A thermal printhead detecting device and method and a thermal printer using the same |
-
1989
- 1989-12-25 JP JP1332580A patent/JPH03193367A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100354128B1 (en) * | 1998-12-22 | 2002-12-28 | 삼성전자 주식회사 | Circuit for preventing overheat of heater |
| US6738085B2 (en) | 2000-10-30 | 2004-05-18 | Sharp Kabushiki Kaisha | Printing apparatus and communication apparatus and information processing apparatus having the same |
| WO2010066162A1 (en) * | 2008-12-12 | 2010-06-17 | 山东新北洋信息技术股份有限公司 | A thermal printhead detecting device and method and a thermal printer using the same |
| US8497890B2 (en) | 2008-12-12 | 2013-07-30 | Shandong New Beiyang Information Technology Co., Ltd | Thermal print head detecting device and detecting method, and a heat printer using the same |
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