JPS5670976A - Temperature-compensating circuit for thermal printer - Google Patents

Temperature-compensating circuit for thermal printer

Info

Publication number
JPS5670976A
JPS5670976A JP14768179A JP14768179A JPS5670976A JP S5670976 A JPS5670976 A JP S5670976A JP 14768179 A JP14768179 A JP 14768179A JP 14768179 A JP14768179 A JP 14768179A JP S5670976 A JPS5670976 A JP S5670976A
Authority
JP
Japan
Prior art keywords
motor
resistor
characters
pulse
during
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
JP14768179A
Other languages
Japanese (ja)
Inventor
Hiroshi Uehara
Toshiro Tokita
Kyugo Nakamura
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP14768179A priority Critical patent/JPS5670976A/en
Publication of JPS5670976A publication Critical patent/JPS5670976A/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
    • B41J2/35—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 providing current or voltage to the thermal head
    • B41J2/355—Control circuits for heating-element selection
    • B41J2/36—Print density control

Landscapes

  • Electronic Switches (AREA)

Abstract

PURPOSE:To change the period of an impressed pulse current to thereby conduct temperature compensation for exothermic element and eliminate variations in shade of printed characters, by providing a circuit which controls the rotation of a motor for feeding a thermal head in accordance with variations in the dot density of the characters being printed. CONSTITUTION:The exothermic resistor 6 is connected with the head-feeding motor 2 and moved by the motor 2. The rotation frequency of the motor 2 is detected by an encoder 13 and a pulse proportional to the rotation frequency of the motor 2 is generated through the use of light or magnetism. Synchronously with this, a pulse for driving the resistor 6 is generated in accordance with DATA by a pulse-generating circuit for dot pattern 14. A resistor 11 and a transistor 12 for driving motor 2 are connected in series with the motor 2. The transistor 12 is turned ON during the printing of ordinary characters such as alphabets, numerals, KANA, etc. and is turned OFF during the printing of Chinese characters and the like with high dot densities. During the OFF time, the voltage is lowered by an amount corresponding to the resistor 11, resulting in a decrease of the rotation frequency of the motor 2.
JP14768179A 1979-11-16 1979-11-16 Temperature-compensating circuit for thermal printer Pending JPS5670976A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14768179A JPS5670976A (en) 1979-11-16 1979-11-16 Temperature-compensating circuit for thermal printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14768179A JPS5670976A (en) 1979-11-16 1979-11-16 Temperature-compensating circuit for thermal printer

Publications (1)

Publication Number Publication Date
JPS5670976A true JPS5670976A (en) 1981-06-13

Family

ID=15435867

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14768179A Pending JPS5670976A (en) 1979-11-16 1979-11-16 Temperature-compensating circuit for thermal printer

Country Status (1)

Country Link
JP (1) JPS5670976A (en)

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