JPS57148667A - Printer - Google Patents

Printer

Info

Publication number
JPS57148667A
JPS57148667A JP56034529A JP3452981A JPS57148667A JP S57148667 A JPS57148667 A JP S57148667A JP 56034529 A JP56034529 A JP 56034529A JP 3452981 A JP3452981 A JP 3452981A JP S57148667 A JPS57148667 A JP S57148667A
Authority
JP
Japan
Prior art keywords
dots
letter
register
printed
counting
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
JP56034529A
Other languages
Japanese (ja)
Inventor
Shunpei Takenaka
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP56034529A priority Critical patent/JPS57148667A/en
Publication of JPS57148667A publication Critical patent/JPS57148667A/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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
    • B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns

Abstract

PURPOSE:To provide a printer that can automatically recognize the results of printed letters by counting and remembering the total number of black dots and white dots of a letter to be printed and reading a printed letter and counting and remembering the number of black dots and white dots in it and comparing both countings. CONSTITUTION:When a letter pattern is serially output to a printer 14, the number of dots is counted and mapped with a counter 16, and the number of dots of black points in a letter pattern that is the content of the counter 16 is transferred to a register 18 through a register 17 by an interrupted signal of DMA finishing and input to the CPU data bus 31. When printing of a letter is finished, a sensor 9 finishes reading of the pattern of a printed letter before the above mentioned letter, and counts the number of dots with a counter 19 and transfers the counting to a register 20. A printer control section 13 compares the number A of dots stored in the register 18, and judges as good print if the difference of the numbers is in a specified range.
JP56034529A 1981-03-12 1981-03-12 Printer Pending JPS57148667A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56034529A JPS57148667A (en) 1981-03-12 1981-03-12 Printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56034529A JPS57148667A (en) 1981-03-12 1981-03-12 Printer

Publications (1)

Publication Number Publication Date
JPS57148667A true JPS57148667A (en) 1982-09-14

Family

ID=12416795

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56034529A Pending JPS57148667A (en) 1981-03-12 1981-03-12 Printer

Country Status (1)

Country Link
JP (1) JPS57148667A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4813802A (en) * 1986-09-04 1989-03-21 Alcatel Business Systems Ltd. Device for verifying if thermal printer is operating correctly

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52131424A (en) * 1976-04-28 1977-11-04 Hitachi Ltd Dot-type printer
JPS5427728A (en) * 1977-08-03 1979-03-02 Ricoh Co Ltd Printer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52131424A (en) * 1976-04-28 1977-11-04 Hitachi Ltd Dot-type printer
JPS5427728A (en) * 1977-08-03 1979-03-02 Ricoh Co Ltd Printer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4813802A (en) * 1986-09-04 1989-03-21 Alcatel Business Systems Ltd. Device for verifying if thermal printer is operating correctly

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