JPS63303769A - Thermal printer - Google Patents
Thermal printerInfo
- Publication number
- JPS63303769A JPS63303769A JP62139742A JP13974287A JPS63303769A JP S63303769 A JPS63303769 A JP S63303769A JP 62139742 A JP62139742 A JP 62139742A JP 13974287 A JP13974287 A JP 13974287A JP S63303769 A JPS63303769 A JP S63303769A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- thermal head
- transistor
- output
- 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
- 230000002159 abnormal effect Effects 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 230000007257 malfunction Effects 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000004913 activation Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 230000002747 voluntary effect Effects 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
- B41J2/375—Protection arrangements against overheating
Landscapes
- Electronic Switches (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はサーマルプリンタに関するもので、サーマルプ
リンタの安全性・上傾性の向上させるものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thermal printer, and is intended to improve the safety and upward tilting properties of the thermal printer.
仁従来の技術〕
従来のサーマルプリンタは時分［６１−５１５５５号の
ようにサーマルヘッドの１度馨横知して１：０ｔｌｉｉ
ｉＡ度が一定になるよう制御を行なつくいた。[Conventional technology] Conventional thermal printers have a thermal head that is 1:0 tlii as shown in No. 61-51555.
Control was carried out to keep the iA degree constant.
上記従来技術はサーマルプリンタの＃度制御回路のａｌ
＆−作・４走について配慮されておらず、制御回路が誤
動作した場曾には、サーマルヘッドや電源回路の破壊や
発火などの危険があった。The above conventional technology is an al
There was no consideration given to the 4-way operation, and if the control circuit malfunctioned, there was a risk of damage to the thermal head or power supply circuit, or fire.
本発明の目的は、このようなサーマルプリンタ１０制＃
回路の誤動作によりサーマルヘッドが異濱加熱を起すの
を防止することにある。The purpose of the present invention is to develop such a thermal printer with #10 system.
The purpose is to prevent abnormal heating of the thermal head due to malfunction of the circuit.
上記目的は、サーマルヘッドの温度を検知し、異虜温匿
時にはサーマルヘッドの駆動電源な遮断することにより
達成される。The above object is achieved by detecting the temperature of the thermal head and shutting off the driving power for the thermal head when a foreign prisoner is being kept.
ブー１ルヘツドにとりつけた感温素子の出力を比較回路
によって所定温度以上か以下かを判定する。この比較回
路による温度償却は、マイクロコンピ為−夕などのソフ
トウェアによつて動作する温度検出方法よりも外来ノイ
ズや瞬時停′１などＶζよる誤動作がなく安定した温度
噴出ができる。A comparator circuit determines whether the output of the temperature sensing element attached to the boolean head is above or below a predetermined temperature. Temperature amortization by this comparison circuit allows for more stable temperature ejection without external noise or malfunctions caused by Vζ such as instantaneous stop '1' than a temperature detection method operated by software such as a microcomputer.
以下、本発明の一実ａｔ列を第１図により説明する。第
１図において、１は電源回路、２は′４源回路の出力？
停止させるための副＃端子、５はサーマルヘッド、４は
サーマルヘッドにとりつけらｎたサーミスタ、５はレギ
為レータ、１０は電源回路の出力でサーマルヘッドに鍛
続されている。Hereinafter, one actual AT string of the present invention will be explained with reference to FIG. In Figure 1, 1 is the power supply circuit, and 2 is the output of the 4-source circuit?
A sub-# terminal for stopping, 5 is a thermal head, 4 is a thermistor attached to the thermal head, 5 is a regulator, and 10 is the output of the power supply circuit, which is connected to the thermal head.
サーミスタ４はトランジスタ６で構成される定域流回路
で駆動されている。サーミスタ４の端子層圧Ｖｔｎ ＆
！第２図のように１直により変化する。・抵抗へ、鳥、
為とトランジスタ７．８は比較回路を構成している。レ
ギ為レータ５の出力を抵抗塊と４で分圧した域圧ｔｖ畠
とする。サーマルヘクトの温度が低（Ｖｔ■が■蟲より
高い場合はトランジスタ７はオフとなり、トランジスタ
７のコレクタ電位（比較回路の出力電位）はＯｖとなる
。サーマルヘクトの１直が上昇しｖｔａがｖａより低く
なるとトランジスタ８がオフし、トランジスタ７がオン
し、トランジスタ７のコレクタ電位はハイレベルとなる
。The thermistor 4 is driven by a constant current circuit made up of a transistor 6. Thermistor 4 terminal layer pressure Vtn &
! As shown in Fig. 2, it changes by one shift.・To the resistance, birds;
The transistors 7 and 8 constitute a comparison circuit. The output of the regulator 5 is divided by the resistor block and 4 to obtain the regional pressure tv. When the temperature of the thermal hector is low (Vt■ is higher than ■V), transistor 7 is turned off, and the collector potential of transistor 7 (output potential of the comparator circuit) becomes Ov.The first voltage of the thermal hect increases and vta becomes va When the voltage becomes lower, transistor 8 is turned off, transistor 7 is turned on, and the collector potential of transistor 7 becomes high level.
ここで比較回路の出力９（トランジスタ７のコレクタ出
力）がＯｖからハイレベルに変化するときのサーミスタ
４の温度Ｔαをサーマルヘッドの定格動作温度の上限ま
たは、プリンタが正常に動作しているときのサーマルヘ
ッド５の最高温度に設定してお（。Here, the temperature Tα of the thermistor 4 when the output 9 of the comparison circuit (collector output of the transistor 7) changes from Ov to high level is the upper limit of the rated operating temperature of the thermal head, or the upper limit of the rated operating temperature of the thermal head, or the temperature Tα when the printer is operating normally. Set the maximum temperature of thermal head 5 (.
電源回路１は制御１子２の電位がハイレベルのトリガー
により出力１０を遮断するものであるからサーマルヘッ
ド３上のサーミスタ４の温度がＩＩＩａ以上になるとト
ランジスタ７のコレクタはハイレベルを出力し、１Ｉｉ
ｌｃ源回路１の出力を停止させるためサーマルヘッド３
が＠匿Ｔａ以上の異常状態になるのを防ぐことができる
。Since the power supply circuit 1 cuts off the output 10 when the potential of the control 1 element 2 is triggered at a high level, when the temperature of the thermistor 4 on the thermal head 3 becomes higher than IIIa, the collector of the transistor 7 outputs a high level. 1Ii
Thermal head 3 is used to stop the output of LC source circuit 1.
It is possible to prevent this from becoming an abnormal state greater than @anonymous Ta.
＠３図は電源回路１の例である。第１図のように比較回
路の電源をサーマルヘクト５の電源からとる場合には、
比較回路のトランジスタ７の出力のトリガパルスによっ
て゛電源回路１は出力の停止を続ける必要がある。第５
図はそのような電源回路の例である。第５図はリンギン
グチｌ−クコンパータと呼ばれるスイッチングレギル−
タである。図で１１はスイッチングトランジスタ、１２
は７オト・サイリスタである。制御端子２に印、ｖｏさ
れる電圧がＯｖのときフォト・サイリスタはオフ状態に
めりリンギングチ■−クコンバータは発振を続ける。制
御端子２にハイレベルが与えられるとフォト・サイリス
タ１２がオンしスイッチングトランジスタ１１の起動を
阻止し発振を停止させるために出力端子１０には電圧が
出な（なる。@3 Figure is an example of the power supply circuit 1. When the power supply of the comparison circuit is taken from the power supply of the thermal hector 5 as shown in Fig. 1,
The trigger pulse of the output of the transistor 7 of the comparator circuit requires the power supply circuit 1 to continue stopping its output. Fifth
The figure is an example of such a power supply circuit. Figure 5 shows a switching regulator called a ringing converter.
It is ta. In the figure, 11 is a switching transistor, 12
is a 7 oto thyristor. When the voltage applied to the control terminal 2 is Ov, the photothyristor is turned off and the ringing check converter continues to oscillate. When a high level is applied to the control terminal 2, the photothyristor 12 is turned on, preventing activation of the switching transistor 11 and stopping oscillation, so that no voltage is output to the output terminal 10.
第１図では示していないがサーマルヘッドの濃度制御回
路は特許公告昭６１−５１５５５号にあるように、公知
である。Although not shown in FIG. 1, the density control circuit for the thermal head is well known as disclosed in Japanese Patent Publication No. 51555/1983.
本発明によれば、サーマルプリンタにおいて、サーマル
ヘッドのＪＡ常発熱による破損や焼損を防ぐ効果がある
。According to the present invention, in a thermal printer, there is an effect of preventing damage or burnout due to JA constant heat generation of the thermal head.
第１図は本発明の一実施例を示す回路図、第２図は比較
回路の動作説明を示す図、第３図は電源回路の一例を示
す回路図である。
１・−電源回路、２−・制御端子、Ｓ・・・サーマルヘ
ッド、４・・・サーミスタ、１２・・・フォト・サイリ
スタ。
代理人弁理士 小 川 ａ 男、。
％ｌ凶
第２目
７２Ｌ 混層
地５図
手続補正書（自発）
事件の表示
昭和６２ 年特許願第 １５９７４２ 号発明の名
称 サーマルプリンタ
補正をする者
ＩＩ町帳係 特許出願人
名 称 １５１０１株式会ｔト 日 立
製 作 所第１図FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing an explanation of the operation of a comparison circuit, and FIG. 3 is a circuit diagram showing an example of a power supply circuit. 1.-power supply circuit, 2-.control terminal, S.. thermal head, 4.. thermistor, 12.. photo thyristor. Representative patent attorney A. Ogawa. %L No. 2 72L Mixed layered land map 5 procedural amendment (voluntary) Indication of case 1988 Patent application No. 159742 Name of invention Person who corrects thermal printer II Town book clerk Name of patent applicant Title 15101 Stock Company T Hitachi
Manufacturing site diagram 1
Claims (1)
供給するための出力とこの出力を遮断するための制御端
子とを有する電源回路と、サーマルヘッドに取りつけた
感温素子と、この感温素子出力と基準値とを比較しサー
マルヘッドの温度が所定の温度以上であるか否かを出力
する比較回路とを備え、該比較回路の出力で前記電源回
路の制御端子を制御することによりサーマルヘッドが所
定の温度以上のときには前記電源回路の出力を遮断する
ことを特徴とするサーマルプリンタ。1. A thermal head, a power supply circuit having an output for supplying energy to the thermal head and a control terminal for cutting off this output, a temperature sensing element attached to the thermal head, and the output and reference of this temperature sensing element. and a comparison circuit that outputs whether the temperature of the thermal head is equal to or higher than a predetermined temperature by comparing the temperature of the thermal head with a predetermined temperature. A thermal printer characterized in that the output of the power supply circuit is cut off when the temperature exceeds the temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62139742A JPS63303769A (en) | 1987-06-05 | 1987-06-05 | Thermal printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62139742A JPS63303769A (en) | 1987-06-05 | 1987-06-05 | Thermal printer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63303769A true JPS63303769A (en) | 1988-12-12 |
Family
ID=15252320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62139742A Pending JPS63303769A (en) | 1987-06-05 | 1987-06-05 | Thermal printer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63303769A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5220350A (en) * | 1990-07-30 | 1993-06-15 | Minolta Camera Kabushiki Kaisha | Method and apparatus for preventing overheating of a thermal head |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58222864A (en) * | 1982-06-21 | 1983-12-24 | Seiko Instr & Electronics Ltd | Protecting circuit for thermal head |
| JPS60129276A (en) * | 1983-12-16 | 1985-07-10 | Nec Corp | Driving circuit for thermal recording head |
-
1987
- 1987-06-05 JP JP62139742A patent/JPS63303769A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58222864A (en) * | 1982-06-21 | 1983-12-24 | Seiko Instr & Electronics Ltd | Protecting circuit for thermal head |
| JPS60129276A (en) * | 1983-12-16 | 1985-07-10 | Nec Corp | Driving circuit for thermal recording head |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5220350A (en) * | 1990-07-30 | 1993-06-15 | Minolta Camera Kabushiki Kaisha | Method and apparatus for preventing overheating of a thermal head |
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