JPS55100173A - Protective circuit for heat sensitive head - Google Patents

Protective circuit for heat sensitive head

Info

Publication number
JPS55100173A
JPS55100173A JP640279A JP640279A JPS55100173A JP S55100173 A JPS55100173 A JP S55100173A JP 640279 A JP640279 A JP 640279A JP 640279 A JP640279 A JP 640279A JP S55100173 A JPS55100173 A JP S55100173A
Authority
JP
Japan
Prior art keywords
signals
level
heat sensitive
time
stable
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
JP640279A
Other languages
Japanese (ja)
Inventor
Akira Hasegawa
Suzukazu Iwasaki
Hiroshi Tanaka
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP640279A priority Critical patent/JPS55100173A/en
Publication of JPS55100173A publication Critical patent/JPS55100173A/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
    • B41J2/315—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)
  • Facsimile Heads (AREA)

Abstract

PURPOSE:To prevent the breaking of heat sensitive heads by a method wherein a circuit is mounted which detects the output of ''H'' level signals from a heat sensitive element drive transistor during time not less than a fixed time. CONSTITUTION:Signals in a ''H'' level are not continuously formed at a portion of resistance 11 normally during time not less than time intervals that transistors 51-54 are each in ON. However, when any of the transistors 51-54 is broken due to some cause and the signals in the ''H'' level continuously flow, a re-trigger mono-stable multivibrator 14 returns to a stable condition after a single, stable time elapses, the signals in the ''H'' level are produced, ''H'' signals are applied to a NAND gate, and the output becomes to signals in a ''L'' level. The ''L'' signals are detected by means of a detecting circuit 16, clear a bit select circuit 8 and turn all of drive elements 91-94 OFF. Thus, currents do not flow through heat sensitive elements 2, and breaking is prevented.
JP640279A 1979-01-23 1979-01-23 Protective circuit for heat sensitive head Pending JPS55100173A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP640279A JPS55100173A (en) 1979-01-23 1979-01-23 Protective circuit for heat sensitive head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP640279A JPS55100173A (en) 1979-01-23 1979-01-23 Protective circuit for heat sensitive head

Publications (1)

Publication Number Publication Date
JPS55100173A true JPS55100173A (en) 1980-07-30

Family

ID=11637368

Family Applications (1)

Application Number Title Priority Date Filing Date
JP640279A Pending JPS55100173A (en) 1979-01-23 1979-01-23 Protective circuit for heat sensitive head

Country Status (1)

Country Link
JP (1) JPS55100173A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59118477A (en) * 1982-12-27 1984-07-09 Hitachi Ltd Thermal printer
US5316341A (en) * 1989-03-16 1994-05-31 Productive Environments, Inc. Hypertext book attachment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59118477A (en) * 1982-12-27 1984-07-09 Hitachi Ltd Thermal printer
US5316341A (en) * 1989-03-16 1994-05-31 Productive Environments, Inc. Hypertext book attachment

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