JPS5622184A - Malfunction detecting system for serial printer - Google Patents

Malfunction detecting system for serial printer

Info

Publication number
JPS5622184A
JPS5622184A JP9848079A JP9848079A JPS5622184A JP S5622184 A JPS5622184 A JP S5622184A JP 9848079 A JP9848079 A JP 9848079A JP 9848079 A JP9848079 A JP 9848079A JP S5622184 A JPS5622184 A JP S5622184A
Authority
JP
Japan
Prior art keywords
print head
generated
count pulse
print
signal
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
JP9848079A
Other languages
Japanese (ja)
Inventor
Masahisa Narita
Osamu Tomita
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 JP9848079A priority Critical patent/JPS5622184A/en
Publication of JPS5622184A publication Critical patent/JPS5622184A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To detect immediately the printing malfunction, by collating the count pulse which is generated in accordance with the rotation of the print head with the print check signal generated synchronously with the count pulse.
CONSTITUTION: Signal converting circuit 26 generates "1" or "0" in accordance with the output signal of present-position counter 12 at the moment the count pulse is generated, and then inverts "1" and "0" with every two units of the count pulse. At the same time, the initial state is set to the phase of the print check signal which is obtained when the selection of print head 3-1 is carried out properly. Accordingly, the coincidence must always be obtained through the collation given by coincidence detecting circuit 27 between the print check signal of register 25 and the output of signal converting circuit 26 and in case the count pulses are generated normally and counted. In this connection, the output is obtained through circuit 27 in case no coincidence is obtained through the collation given every 1/2 pitch of the rotation of the print head. Thus the fault is informed to the external control unit, and then the hammer action of e.g. print head 3-1 is discontinued to prevent the printing of wrong characters.
COPYRIGHT: (C)1981,JPO&Japio
JP9848079A 1979-07-31 1979-07-31 Malfunction detecting system for serial printer Pending JPS5622184A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9848079A JPS5622184A (en) 1979-07-31 1979-07-31 Malfunction detecting system for serial printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9848079A JPS5622184A (en) 1979-07-31 1979-07-31 Malfunction detecting system for serial printer

Publications (1)

Publication Number Publication Date
JPS5622184A true JPS5622184A (en) 1981-03-02

Family

ID=14220809

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9848079A Pending JPS5622184A (en) 1979-07-31 1979-07-31 Malfunction detecting system for serial printer

Country Status (1)

Country Link
JP (1) JPS5622184A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5087134A (en) * 1989-04-07 1992-02-11 Oki Electric Industry Co., Ltd. Method of and device for printer control

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5087134A (en) * 1989-04-07 1992-02-11 Oki Electric Industry Co., Ltd. Method of and device for printer control

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