JPS5576479A - Driving circuit for printer electromagnet - Google Patents

Driving circuit for printer electromagnet

Info

Publication number
JPS5576479A
JPS5576479A JP14995778A JP14995778A JPS5576479A JP S5576479 A JPS5576479 A JP S5576479A JP 14995778 A JP14995778 A JP 14995778A JP 14995778 A JP14995778 A JP 14995778A JP S5576479 A JPS5576479 A JP S5576479A
Authority
JP
Japan
Prior art keywords
voltage
magnet
current
electromagnet
printer
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
JP14995778A
Other languages
Japanese (ja)
Inventor
Kenji Okuna
Koichi Shimizu
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 JP14995778A priority Critical patent/JPS5576479A/en
Publication of JPS5576479A publication Critical patent/JPS5576479A/en
Pending legal-status Critical Current

Links

Landscapes

  • Dot-Matrix Printers And Others (AREA)
  • Impact Printers (AREA)

Abstract

PURPOSE: To reduce the loss of transister Tr by installing transistor Tr to flow the current intermittently to the electromagnet to the printer driving circuit plus the diode which flows the current transiently to the magnet when the Tr is off.
CONSTITUTION: Transistor Tr2 is provided to flow the current intermittently to electromagnet 1 of the driving circuit which operates the printer in a high speed, along with diode 3 which flows the current transiently to magnet 1 when Tr2 is off. In addition, resistance 5 is connected in series to magnet 1 to measure the current flowing to magnet 1, and differential amplifier 6 is connected across resistance 5 to convert the current flowing to magnet 1 into the voltage. This voltage is applied to one terminal of comparator 7, and reference voltage Vr is applied to the other terminal for comparison. Then the voltage underwent the comparison through comparator 7 is applied to AND circuit 8, and the logic product is secured to control voltage A to set voltage C for control of Tr2. Thus the power consumption is reduced for Tr2.
COPYRIGHT: (C)1980,JPO&Japio
JP14995778A 1978-12-06 1978-12-06 Driving circuit for printer electromagnet Pending JPS5576479A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14995778A JPS5576479A (en) 1978-12-06 1978-12-06 Driving circuit for printer electromagnet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14995778A JPS5576479A (en) 1978-12-06 1978-12-06 Driving circuit for printer electromagnet

Publications (1)

Publication Number Publication Date
JPS5576479A true JPS5576479A (en) 1980-06-09

Family

ID=15486288

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14995778A Pending JPS5576479A (en) 1978-12-06 1978-12-06 Driving circuit for printer electromagnet

Country Status (1)

Country Link
JP (1) JPS5576479A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59139606A (en) * 1982-09-10 1984-08-10 ロ−ベルト・ボツシユ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング Coil current controller
JPS6216161A (en) * 1985-07-16 1987-01-24 Fujitsu Ltd System for driving printing head

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59139606A (en) * 1982-09-10 1984-08-10 ロ−ベルト・ボツシユ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング Coil current controller
JPS6216161A (en) * 1985-07-16 1987-01-24 Fujitsu Ltd System for driving printing head

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