JPS5749577A - Protective circuit of magnet - Google Patents

Protective circuit of magnet

Info

Publication number
JPS5749577A
JPS5749577A JP12629980A JP12629980A JPS5749577A JP S5749577 A JPS5749577 A JP S5749577A JP 12629980 A JP12629980 A JP 12629980A JP 12629980 A JP12629980 A JP 12629980A JP S5749577 A JPS5749577 A JP S5749577A
Authority
JP
Japan
Prior art keywords
counter
coil
current
reset
magnet
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.)
Granted
Application number
JP12629980A
Other languages
Japanese (ja)
Other versions
JPS6227674B2 (en
Inventor
Mikio Koga
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP12629980A priority Critical patent/JPS5749577A/en
Publication of JPS5749577A publication Critical patent/JPS5749577A/en
Publication of JPS6227674B2 publication Critical patent/JPS6227674B2/ja
Granted 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
    • B41J9/00—Hammer-impression mechanisms
    • B41J9/44—Control for hammer-impression mechanisms
    • B41J9/52—Control for hammer-impression mechanisms for checking the operation of print hammers

Landscapes

  • Dot-Matrix Printers And Others (AREA)

Abstract

PURPOSE:To output a warning signal more reliably in a protection circuit of a magnet for warning continuous application of current of a coil by a method wherein when no-current time of the coil takes the normal value a counter is reset. CONSTITUTION:When a wire driving coil 1g is under the state of no current, an input voltage V1 to a level conversion circuit 26 through diode D3 increases and ''0'' is outputted to an AND circuit 27. Then, a counter 29 counts a sampling pulse 39 as it is and integrates the no-current time of the coil instantaneously. When the value of the counter 29 takes the normal value, the counter 30 which has counted a timing pulse 3 from an oscillator 23 is reset. When the coil 1g is brought into the state of continuous application of current by any reason, since the counter 30 is not reset by the counter 29, alarm signal ALM is outputted when pulses 3 are counted by an intended valve.
JP12629980A 1980-09-11 1980-09-11 Protective circuit of magnet Granted JPS5749577A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12629980A JPS5749577A (en) 1980-09-11 1980-09-11 Protective circuit of magnet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12629980A JPS5749577A (en) 1980-09-11 1980-09-11 Protective circuit of magnet

Publications (2)

Publication Number Publication Date
JPS5749577A true JPS5749577A (en) 1982-03-23
JPS6227674B2 JPS6227674B2 (en) 1987-06-16

Family

ID=14931760

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12629980A Granted JPS5749577A (en) 1980-09-11 1980-09-11 Protective circuit of magnet

Country Status (1)

Country Link
JP (1) JPS5749577A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0499649A (en) * 1990-08-17 1992-03-31 Tokyo Electric Co Ltd Dot printer
EP0701261A1 (en) * 1994-09-06 1996-03-13 Motorola, Inc. Circuit and method of detecting actuator movement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0499649A (en) * 1990-08-17 1992-03-31 Tokyo Electric Co Ltd Dot printer
EP0701261A1 (en) * 1994-09-06 1996-03-13 Motorola, Inc. Circuit and method of detecting actuator movement

Also Published As

Publication number Publication date
JPS6227674B2 (en) 1987-06-16

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