JPS62146649A - Thermal head protective circuit - Google Patents
Thermal head protective circuitInfo
- Publication number
- JPS62146649A JPS62146649A JP60288832A JP28883285A JPS62146649A JP S62146649 A JPS62146649 A JP S62146649A JP 60288832 A JP60288832 A JP 60288832A JP 28883285 A JP28883285 A JP 28883285A JP S62146649 A JPS62146649 A JP S62146649A
- Authority
- JP
- Japan
- Prior art keywords
- thermal head
- transistor
- pressed
- state
- printing paper
- 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
- 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、特にサーマルヘッドの保護
回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thermal printer, and particularly to a protection circuit for a thermal head.
従来、この種のプリンタは、電源が投入されている間は
常にサーマルヘッドに通電されていて、サーマルヘッド
の通電を制御する回路は特になかった。Conventionally, in this type of printer, the thermal head is always energized while the power is turned on, and there is no particular circuit for controlling the energization of the thermal head.
上述した従来のサーマルプリンタは、電源が投入されて
いる時でもサーマルヘッドの脱着が可能になっているの
で、誤ワて電源が投入された状態でサーマルヘッドの脱
着を行なってしまうと、サーマルヘッド脱着の時にサー
マルヘッド上に実装されたサーマルヘッド制御用ICの
動作が不安定になり、サーマルヘッドの発熱体に異常に
長時間の通電がなされたり、号−マルヘッド制御用IC
K異常な電圧が印加され、サーマルヘッドが破壊してし
まうという欠点があった。In the conventional thermal printers mentioned above, the thermal head can be attached or detached even when the power is on, so if you accidentally attach or detach the thermal head while the power is on, the thermal head may During attachment and detachment, the operation of the thermal head control IC mounted on the thermal head may become unstable, and the heating element of the thermal head may be energized for an abnormally long time.
There was a drawback that an abnormal voltage was applied and the thermal head was destroyed.
本発明のサーマルヘッド保護回路は、サーマルヘッドに
対する通電をサーマルヘッドを印字用紙に押し付けてい
るときのみ行なう機能を有している。The thermal head protection circuit of the present invention has a function of energizing the thermal head only when the thermal head is pressed against printing paper.
次に本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第1図は本発明の一実施例の回路図である。トランジス
タ1はサーマルヘッド用電源とサーマルヘッドの間に接
続され、インバータIC(オーブンコレクタ出力)2に
よって抵抗3を通して駆動される。抵抗4はトランジス
タ1のペースとサーマルヘッド用電源の間に接続される
。FIG. 1 is a circuit diagram of an embodiment of the present invention. A transistor 1 is connected between a thermal head power supply and a thermal head, and is driven by an inverter IC (oven collector output) 2 through a resistor 3. A resistor 4 is connected between the pace of the transistor 1 and the power supply for the thermal head.
インバータIC2にはサーマルヘッドを押し付けている
時にハイ・レベル、それ以外はローレベルになる信号を
入力する。サーマルヘッドを押し付けている時にはイン
バータIC2の出力はON状態となり、抵抗3を通して
トランジスタ10ベースに電流が流れる。トランジスタ
1のペースに電流が流れる事により、トランジスタ1は
オン状態となりサーマルヘッド用電源がサーマルヘッド
に通電される。A signal is input to the inverter IC2 which is at a high level when the thermal head is being pressed, and which is at a low level at other times. When the thermal head is being pressed, the output of the inverter IC2 is in the ON state, and current flows through the resistor 3 to the base of the transistor 10. When a current flows through the transistor 1, the transistor 1 is turned on, and the thermal head power supply is applied to the thermal head.
サーマルヘッドが印字用紙に押し付けられていない時に
はインバータ2の出力がオフ状態となシトランジスタ1
のペース電流が流れずトランジスタ1はOFF状態とな
りサーマルヘッドには通電されない。When the thermal head is not pressed against the printing paper, the output of inverter 2 is off.
Since no pace current flows, transistor 1 is turned off and no current is applied to the thermal head.
以上説明したように本発明は、サーマルヘッドを印字用
紙に押し付けていない時には印字動作を行なわない事か
ら、サーマルヘッドを印字用紙に押し付けているという
信号によってサーマルヘッドへの通電を制御することに
より、電源が投入されている時でも印字待ち状態のよう
にサーマルヘッドが印字用紙に押し付けられていない状
態に於いてサーマルヘッドの脱着を行なっても、サーマ
ルヘッドの破壊を防止する効果がある。As explained above, the present invention does not perform a printing operation when the thermal head is not pressed against the printing paper, so by controlling the energization to the thermal head based on a signal indicating that the thermal head is pressed against the printing paper, Even when the power is turned on and the thermal head is attached and detached in a state where the thermal head is not pressed against the printing paper, such as in a printing standby state, it is effective in preventing damage to the thermal head.
第1図は本発明のサーマルヘッド保護回路の一実施例の
回路図である。
1・・・・・・トランジスタ、2・・・・・・インバー
タIC(オープンコレクタ出力)、3・・・・・・抵抗
、4・・・・・・抵抗。FIG. 1 is a circuit diagram of an embodiment of the thermal head protection circuit of the present invention. 1... Transistor, 2... Inverter IC (open collector output), 3... Resistor, 4... Resistor.
Claims (1)
マルヘッドの発熱体に通電する機能を有したサーマルヘ
ッド保護回路。A thermal head protection circuit that has the function of energizing the heating element of the thermal head only when the thermal head is pressed against the printing paper.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60288832A JPS62146649A (en) | 1985-12-20 | 1985-12-20 | Thermal head protective circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60288832A JPS62146649A (en) | 1985-12-20 | 1985-12-20 | Thermal head protective circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS62146649A true JPS62146649A (en) | 1987-06-30 |
Family
ID=17735322
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP60288832A Pending JPS62146649A (en) | 1985-12-20 | 1985-12-20 | Thermal head protective circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62146649A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109414939A (en) * | 2016-10-05 | 2019-03-01 | 佐藤控股株式会社 | Printer |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56159182A (en) * | 1980-05-14 | 1981-12-08 | Ricoh Co Ltd | Thermosensitive recording device |
JPS58193172A (en) * | 1982-05-07 | 1983-11-10 | Fujitsu Ltd | Thermal printer |
-
1985
- 1985-12-20 JP JP60288832A patent/JPS62146649A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56159182A (en) * | 1980-05-14 | 1981-12-08 | Ricoh Co Ltd | Thermosensitive recording device |
JPS58193172A (en) * | 1982-05-07 | 1983-11-10 | Fujitsu Ltd | Thermal printer |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109414939A (en) * | 2016-10-05 | 2019-03-01 | 佐藤控股株式会社 | Printer |
EP3524435A4 (en) * | 2016-10-05 | 2019-11-13 | Sato Holdings Kabushiki Kaisha | Printer |
US10882330B2 (en) | 2016-10-05 | 2021-01-05 | Sato Holdings Kabushiki Kaisha | Printer |
CN109414939B (en) * | 2016-10-05 | 2021-07-16 | 佐藤控股株式会社 | Printer with a movable platen |
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