JPH01290444A - Coil temperature detection circuit - Google Patents

Coil temperature detection circuit

Info

Publication number
JPH01290444A
JPH01290444A JP12121388A JP12121388A JPH01290444A JP H01290444 A JPH01290444 A JP H01290444A JP 12121388 A JP12121388 A JP 12121388A JP 12121388 A JP12121388 A JP 12121388A JP H01290444 A JPH01290444 A JP H01290444A
Authority
JP
Japan
Prior art keywords
coil
detection circuit
temperature detection
coils
thermister
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
Application number
JP12121388A
Other languages
Japanese (ja)
Inventor
Takahiko Aragaki
新垣　隆彦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP12121388A priority Critical patent/JPH01290444A/en
Publication of JPH01290444A publication Critical patent/JPH01290444A/en
Pending legal-status Critical Current

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
    • B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
    • B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
    • B41J2/30—Control circuits for actuators

Abstract

PURPOSE:To make possible the detection of a coil which indicates a high temperature by providing a coil temperature detection circuit of such a constitution that a thermister is installed for each coil and these thermisters are connected in parallel. CONSTITUTION:A printing head drive circuit 1 prints dots by applying an electric current selectively to coils L1-Ln, and besides, has a thermister TR1 near the coil L1. These thermisters TR1-TRn are connected in parallel. Therefore, if any one of the coils becomes hot, the thermister corresponding to such a coil indicates a drop in the resistance value, and even a single detection circuit can detect which one of the coils becomes hot.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、ドツトインパクトプリンタの印字ヘッドの温
度検出に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to temperature sensing of a print head of a dot impact printer.

〔従来の技術〕[Conventional technology]

従来この種の印字ヘッドの温度検出は、印字ヘッドの複
数のコイルに対して１個のサーミスタを有していた。Traditionally, temperature sensing for this type of printhead has included one thermistor for each of the printhead's coils.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上述した従来のヘッド温度検出機構は、印字ヘッド全体
に対して１個のサーミスタしか設けられていないため、
１つのコイルだけがドツトデユーティが高くて、高温に
なった場合、これを検出することができず、特定のコイ
ルが焼は切れるという欠点があった。The conventional head temperature detection mechanism described above has only one thermistor for the entire print head.
There was a drawback that if only one coil had a high dot duty and the temperature reached a high temperature, it could not be detected and the particular coil would burn out.

〔課題を解決するための手段〕[Means to solve the problem]

本発明のコイル温度検出回路は、すべてのコイルに対し
て、各々にサーミスタを有し、そのサーミスタは並列に
接続している。The coil temperature detection circuit of the present invention has a thermistor for each coil, and the thermistors are connected in parallel.

〔実施例〕〔Example〕

第１図は本発明の一実施例の回路図を示す。 FIG. 1 shows a circuit diagram of an embodiment of the present invention.

印字ヘッド駆動回路１は、フィルＬ１〜Ｌｎに選択的に
電流を流すことによって、ドツトを印字する。コイルＬ
１の温度を測定するために、コイルＬ１の近くにサーミ
スタＴＲＩを配置する。サーミスタＴＲＩ〜ＴＲ，は並
列に接続されている。The print head drive circuit 1 prints dots by selectively passing current through the fills L1 to Ln. Coil L
In order to measure the temperature of L1, a thermistor TRI is placed near the coil L1. Thermistors TRI to TR are connected in parallel.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、各コイルに対応するサーミスタな
並列に接続することにより、どれか１個のコイルが高温
になった場合でも、それに対応するサーミスタの抵抗値
が下がり、検出回路は１回路でもコイルのどれかが高温
となったことを検出することができる。As explained above, by connecting the thermistors corresponding to each coil in parallel, even if any one coil becomes high temperature, the resistance value of the corresponding thermistor will decrease, and even one detection circuit will be used. It is possible to detect when any of the coils becomes hot.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例を示す回路図である。 １・・・・・・印字ヘッド駆動回路、Ｌ１〜ｎ・・・・
・・印字ヘッドのコイル％　ＴＲＩ〜ｎ・・・・・・サ
ーミスタ、２・・・・・・コンパレータ。 代理人　弁理士　　内　原　　　音FIG. 1 is a circuit diagram showing an embodiment of the present invention. 1...Print head drive circuit, L1~n...
...Print head coil% TRI~n...Thermistor, 2...Comparator. Agent Patent Attorney Oto Uchihara

Claims (1)

【特許請求の範囲】[Claims] 印字ヘッドに複数のコイルを有するドットインパクトプ
リンタにおいて、前記印字ヘッドのコイルの各々に温度
測定用サーミスタを設け、前記サーミスタを並列に接続
することにより温度検出回路としたことを特徴とするコ
イル温度検出回路。A dot impact printer having a plurality of coils in a print head, wherein each of the coils of the print head is provided with a temperature measuring thermistor, and the thermistors are connected in parallel to form a temperature detection circuit. circuit.
JP12121388A 1988-05-17 1988-05-17 Coil temperature detection circuit Pending JPH01290444A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12121388A JPH01290444A (en) 1988-05-17 1988-05-17 Coil temperature detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12121388A JPH01290444A (en) 1988-05-17 1988-05-17 Coil temperature detection circuit

Publications (1)

Publication Number Publication Date
JPH01290444A true JPH01290444A (en) 1989-11-22

Family

ID=14805678

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12121388A Pending JPH01290444A (en) 1988-05-17 1988-05-17 Coil temperature detection circuit

Country Status (1)

Country Link
JP (1) JPH01290444A (en)

Similar Documents

Publication Publication Date Title
WO2010066162A1 (en) A thermal printhead detecting device and method and a thermal printer using the same
JP3567241B2 (en) Printing control device
JPS5814665A (en) Temperature controlling system of heat-sensitive recorder
JPH01290444A (en) Coil temperature detection circuit
JP2525896B2 (en) Printer device
JPH0368832B2 (en)
JPS58110269A (en) Thermal transfer printer
JP4309610B2 (en) Thermal printhead operation
JPH02299857A (en) Solenoid type printing head or temperature monitor of hammer table
US5720561A (en) Printer coil temperature sensor and method
JPH10250130A (en) Printing control unit for thermal line printer, printing control method for thermal line printer, and printing unit
JPH06198943A (en) Thermal head
JPS61228970A (en) Thermal head driver
JP2681004B2 (en) Thermal head control circuit
JP2002137431A (en) Thermal printer
JPH088821Y2 (en) Piezoelectric actuator excitation circuit
JP2961611B2 (en) Thermal head control circuit
JPS61195860A (en) Thermal head control
JPH05246070A (en) Thermal line printer
JPH04368860A (en) Thermal printer
JPH0351146A (en) Thermal head energized control circuit
JPH04320859A (en) Thermal printer
JPH074944B2 (en) Thermal head drive circuit
JPH07242040A (en) Temperature detector for printing head of printer
JPS63296965A (en) Driving system for thermal head