JPH02229056A - Head damage preventive circuit of thermal printer - Google Patents
Head damage preventive circuit of thermal printerInfo
- Publication number
- JPH02229056A JPH02229056A JP1050261A JP5026189A JPH02229056A JP H02229056 A JPH02229056 A JP H02229056A JP 1050261 A JP1050261 A JP 1050261A JP 5026189 A JP5026189 A JP 5026189A JP H02229056 A JPH02229056 A JP H02229056A
- Authority
- JP
- Japan
- Prior art keywords
- cpu
- abnormality
- head
- signal
- monitor part
- 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
- 230000006378 damage Effects 0.000 title claims abstract description 11
- 230000003449 preventive effect Effects 0.000 title 1
- 230000005856 abnormality Effects 0.000 claims abstract description 19
- 238000012544 monitoring process Methods 0.000 claims abstract description 12
- 230000002265 prevention Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 abstract description 4
- 230000003068 static effect Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
Landscapes
- Electronic Switches (AREA)
- Accessory Devices And Overall Control Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、サーマルプリンタの印字装置におけるヘッド
損傷防止回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a head damage prevention circuit in a printing device of a thermal printer.
［発明の概要］
本発明は、サーマルプリンタのヘッド損傷防止回路にお
いて、ＣＰＵの異常を監視し、該ＣＰＵの異常を検出し
た時サーマルヘッドの駆動を停止する駆動停止信号を出
力すると共に異常発生信号を出力してＣＰＵを初期化さ
せる監視部を設け、ヘッドの燃焼等の損傷を防止するよ
うにしたものである。[Summary of the Invention] The present invention includes a head damage prevention circuit for a thermal printer that monitors a CPU for abnormality, and when an abnormality of the CPU is detected, outputs a drive stop signal to stop driving the thermal head, and also outputs an abnormality occurrence signal. A monitoring section is provided that outputs a value to initialize the CPU, thereby preventing damage such as burning of the head.
［従来の技術］
従来、第２図に示すようにマスターＣＰＵ３とスレーブ
ＣＰＵ１３の２つのＣＰＵでヘッド駆動部７の異常を監
視し、どちらか一方のＣＰＵが異常状態になった場合で
も、正常なもう一方のｃｐＵでヘッド駆動部７の通電を
停止してヘッドの燃焼等の損傷を防止する方法が知られ
ている。例えば、特開昭６３−１２５３７４号にこのよ
うな複数の制御部を用いた印字装置が記載されている。[Prior Art] Conventionally, as shown in FIG. 2, two CPUs, a master CPU 3 and a slave CPU 13, monitor abnormalities in the head drive unit 7, and even if one of the CPUs is in an abnormal state, the normal state is maintained. A method is known in which the other CPU stops energizing the head drive unit 7 to prevent damage such as burning of the head. For example, Japanese Patent Laid-Open No. 63-125374 describes a printing device using such a plurality of control sections.
［発明が解決しようとする課題］
しかし、上記のような装置は、回路構成が大規模になる
うえ、駆動部の停止はＣＰＵでしか制御できないため、
静電気等によりこれらのＣＰＩＪが両方とも異常状態に
なった場合には、ヘッド駆動部の駆動を停止できなくな
りヘッドの燃焼等の）員傷に至るという課題があった。[Problems to be Solved by the Invention] However, the above-mentioned device has a large-scale circuit configuration, and the stopping of the drive section can only be controlled by the CPU.
If both of these CPIJs become abnormal due to static electricity or the like, there is a problem that the drive of the head drive section cannot be stopped, resulting in injury to personnel (such as burning of the head).
［課題を解決するための手段］
上記課題を解決するために、本発明においては、監視部
から直接ヘッド駆動部の制御を行うようにすることによ
り、ＣＰＵに異常が発生した場合のヘッドの損傷を防止
するようにした。[Means for Solving the Problems] In order to solve the above problems, in the present invention, the head drive unit is controlled directly from the monitoring unit, thereby preventing damage to the head when an abnormality occurs in the CPU. This was made to prevent this.
１作用コ
」二記のような構成によれば、静電気等によりＣＰＵ異
常動作、または該ｃｐｕが破壊された場合においても、
監視部が該ＣＰＵに異常発生信号を出力すると共に迅速
にヘッド駆動部の駆動を停止するので、ヘッドの損傷を
防止することができる。According to the configuration described in item 1 and 2, even if the CPU malfunctions or is destroyed due to static electricity, etc.
Since the monitoring section outputs an abnormality occurrence signal to the CPU and quickly stops driving the head driving section, damage to the head can be prevented.
［実施例］
以下に本発明の実施例を図面に基づいて説明する。第１
図においてＣＰＵ３には、ホスＩ・コンピュータ１と通
信を行うインターフェース２、ＣＰＵ３の制御プログラ
ムが格納されているＲＯＭ４、入力データ等を格納する
Ｒ Ａ、 Ｍ ５、モータ１１を駆動するモータ駆動部
６、ザーマルヘノド１２を駆動するへ、ド駆動部７、記
録紙の位置検出、ヘンドアツブ検出、ヘット温度検出等
を行う各種セン・す・−８と各動作制御のための操作ス
イッチ９、さらにＣＰ Ｕ ３の異常を監視する監視部
ＩＯが接続されている。ＣＰＵ３が正常な動作状態にあ
る時、ＣＰＵ３は、監視部■０に対して一定時間以内の
周期で信号を送出し続け、監視部１０は、この信男の入
力によって、ＣＰＵ３か正常に動作していると判断する
。そして、静電気等のなんらかの原因ＧコよりＣＰＵ３
に異常が発生し、ＣＰＬ１３から監視部１０に対する信
号が途絶えたとき、監視部１０は、ただちにＣＰＩＪ３
を初期化する信号を送出すると共に、ヘット駆動部７に
対しても、駆動電流の通電を停止トする。[Examples] Examples of the present invention will be described below based on the drawings. 1st
In the figure, the CPU 3 includes an interface 2 that communicates with the host I/computer 1, a ROM 4 that stores a control program for the CPU 3, R A and M 5 that store input data, etc., and a motor drive section 6 that drives the motor 11. , a drive unit 7 for driving the thermal head 12, various sensors 8 for detecting the position of the recording paper, detecting the head abutment, detecting the head temperature, etc., an operation switch 9 for controlling each operation, and a CPU 3. A monitoring unit IO is connected to monitor the abnormality. When the CPU 3 is in a normal operating state, the CPU 3 continues to send a signal to the monitoring unit 0 at a cycle within a certain period of time, and the monitoring unit 10 uses Nobuo's input to determine whether the CPU 3 is operating normally or not. It is determined that there is. Then, due to some cause such as static electricity, the CPU3
When an abnormality occurs in the CPL 13 and the signal from the CPL 13 to the monitoring unit 10 is interrupted, the monitoring unit 10 immediately
At the same time, the supply of drive current to the head drive unit 7 is also stopped.
［発明の効果］
この発明は、以」二説明したように、ＣＰＵを監視する
監視部から直接−・ノド駆動部の駆動停止を行えるよう
にする簡単な構造で、ＣＰＵに異常が発生した場合のザ
ーマルヘノドの損傷を防止する効果がある。[Effects of the Invention] As explained below, the present invention has a simple structure that allows the drive of the gutter drive unit to be stopped directly from the monitoring unit that monitors the CPU, and when an abnormality occurs in the CPU. It is effective in preventing damage to the thermal henodon.
第１図は本発明の実施例を示すサーマルプリンター印字
装置の制御ブロック図、第２図は、従来の印字装置の制
御ブロック図である。
１・・・ホストコンピュータ
２・・・インターフェース
３・・・ＣＰＵ
４・・・ＲＯＭ
５・・・ＲＡＭ
６・・・モータ駆動部
７・・・ヘッド駆動部
１０・・・監視部
１１・・・モータ
１２・・・ザーマルヘソド
１３・・・スレーブＣＰＵ
１４・・・異常検出部
以上FIG. 1 is a control block diagram of a thermal printer printing device showing an embodiment of the present invention, and FIG. 2 is a control block diagram of a conventional printing device. 1... Host computer 2... Interface 3... CPU 4... ROM 5... RAM 6... Motor drive section 7... Head drive section 10... Monitoring section 11... Motor 12...Thermal head 13...Slave CPU 14...Abnormality detection unit or higher
Claims (1)
作を制御する制御部と、前記制御部の制御を受けてサー
マルヘッドを駆動するヘッド駆動部と、前記制御部の異
常を監視し、異常発生時に、異常発生信号を出力して前
記制御部を初期化すると共に、前記ヘッド駆動部に駆動
停止信号を出力する監視部とを有するサーマルプリンタ
のヘッド損傷防止回路。A control unit that controls the operation of the thermal printer based on input data from the outside, a head drive unit that drives the thermal head under the control of the control unit, and a head drive unit that monitors the control unit for abnormality, and when an abnormality occurs, A head damage prevention circuit for a thermal printer, comprising a monitoring section that outputs an abnormality occurrence signal to initialize the control section and outputs a drive stop signal to the head drive section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1050261A JPH02229056A (en) | 1989-03-01 | 1989-03-01 | Head damage preventive circuit of thermal printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1050261A JPH02229056A (en) | 1989-03-01 | 1989-03-01 | Head damage preventive circuit of thermal printer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02229056A true JPH02229056A (en) | 1990-09-11 |
Family
ID=12854035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1050261A Pending JPH02229056A (en) | 1989-03-01 | 1989-03-01 | Head damage preventive circuit of thermal printer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02229056A (en) |
-
1989
- 1989-03-01 JP JP1050261A patent/JPH02229056A/en active Pending
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