EP0143995A2 - Imprimante matricielle par points - Google Patents

Imprimante matricielle par points Download PDF

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Publication number
EP0143995A2
EP0143995A2 EP84113151A EP84113151A EP0143995A2 EP 0143995 A2 EP0143995 A2 EP 0143995A2 EP 84113151 A EP84113151 A EP 84113151A EP 84113151 A EP84113151 A EP 84113151A EP 0143995 A2 EP0143995 A2 EP 0143995A2
Authority
EP
European Patent Office
Prior art keywords
dot
character
characters
printing mode
wide
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.)
Ceased
Application number
EP84113151A
Other languages
German (de)
English (en)
Other versions
EP0143995A3 (fr
Inventor
Kazuhisa C/O Patent Division Miyashita
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Publication of EP0143995A2 publication Critical patent/EP0143995A2/fr
Publication of EP0143995A3 publication Critical patent/EP0143995A3/fr
Ceased legal-status Critical Current

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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
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/18—Character-spacing or back-spacing mechanisms; Carriage return or release devices therefor
    • B41J19/20—Positive-feed character-spacing mechanisms
    • B41J19/32—Differential or variable-spacing arrangements
    • 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
    • B41J2/485—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes
    • B41J2/505—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements

Definitions

  • the present invention relates to a dot-matrix printer of the serial type.
  • a dot-matrix printer of the serial type is designed to print dot characters of a specific font. Some of the dot characters printed by this printer are narrower than the same characters printed by a fully formed character printer such as a daisy-wheel printer.
  • the dot-matrix printer sometimes emulates the impact printer; it prints dot characters similar to the characters printed by the impact printer. That is, it may print a dot character that is wider than ordinary characters.
  • a wide character 11 may be printed at the right margin as shown in Fig. lA, or at the left margin as shown in Fig. 1B. In the first case, the wide character 11 inevitably extends over the right margin. In the second case, the last character 10 of the ordinary size also extends over the right margin. That is, the characters 10 and 11 cannot be printed within the normal printing margins (i.e., the distance G).
  • the characters of one line may not vertically aligned with those of the other lines. This deteriorates the quality of printing.
  • the object of this invention is to provide a dot-matrix printer which can neatly print documents even if a dot character, which is wider than those of the ordinary width by a predetermined value, is printed at the left or right margin.
  • a dot-matrix printer comprises a print head for printing dot characters, a platen allowing said print head to print dot characters in a normal margin printing mode and also in an extra wide-margin printing mode, data-receiving means for receiving printing data, including data representing the normal printing mode or extra wide-margin printing mode and character codes representing dot characters to be printed, character dot pattern generating means for generating data representing the dot patterns determined by the printing data input to the data-receiving means, printing mode selecting means for selecting the extra wide-margin printing mode when at least one of the character codes input to said data-receiving means represents a dot character which is wider than characters of ordinary width and is to be printed at the left or right margin, print head moving means for moving said print head along a platen between the ordinary margins or between the extra wide margins in accordance with the data representing the mode selected by said printing mode selecting means, and print head drive means for driving the print head in accordance with the data output by the
  • the ROM 21 stores a program. In accordance with this program the microprocessor 20 controls the printing operation.
  • the I/O interface 22 receives printing data from an external device, e.g., a host computer. This data contains data designating a normal printing mode or an extra-wide-margin printing mode and character codes representing the dot character to be printed.
  • the printer further comprises a character generator 23, a printing buffer memory 24, a print head driver 25, a print head 26, a platen 27, a bus 28, I/O PORT 29, carriage drive motor 30 and paper feed motor 31.
  • the character generator 23 outputs character pattern data corresponding to the printing data received by the I/O interface 22, under the control of the microprocessor 20.
  • the output data of the generator 23 is stored, line by line, in the printing buffer memory 24.
  • the print head driver 25 operates under the control of the microprocessor 20, thereby driving the print head 26.
  • the head 26 prints dot characters on the paper (not shown) wrapped around the platen 27.
  • the platen 27 is so long that the print head 26 prints dot characters over a long distance W as well as over the ordinary printing distance G.
  • the carriage drive motor 30 is used to move a carriage (not shown) along the platen 27.
  • the print head 26 is mounted on this carriage.
  • The.paper feed motor 31 is used to rotate the platen 27 to feed the paper.
  • step Sl printing data is supplied to the dot-matrix printer from the external device.
  • the I/O interface 22 receives this data and supplies it to the microprocessor 20 via the bus 28.
  • the microprocessor 20 reads the character dot pattern from the character generator 23, in accordance with the printing data.
  • step S2 the generator 23 generates the dot pattern data of either an ordinary or wide character in accordance with the printing data, i.e., the normal or extra-wide-margin printing mode data and the character codes.
  • the dot pattern data is stored in the printing buffer memory 24. This memory can store dot pattern data for several lines of characters.
  • step S3 the microprocessor 20 determines, in accordance with the printing mode data from the I/O interface 22, whether or not at least one.of the dot patterns for one line stored in the memory 24 is a wide dot pattern.
  • the microprocessor 20 supplies a control signal designating normal printing to the carriage drive motor 30 through the I/O port 29.
  • the microprocessor 20 controls the carriage drive motor 30, thereby moving the print head 26 to the left margin of ordinary printing.
  • step S7 the head 26 is driven by the print head driver 25.
  • step S8 the head 26 prints the dot characters in accordance with the dot patterns read from the character generator 23 to the printing buffer memory 24.
  • the line thus printed has length G (Fig. 2).
  • step S3 determines whether or not the wide character pattern is positioned at the left or right margin, in step S4.
  • step S4 determines whether or not the wide character pattern is positioned at the left or right margin, in step S4.
  • step S4 proceeds to step S5, S7 and S8, whereby the dot characters are printed.
  • the dot-matrix printer of this invention prints a line of dot characters in the extra wide-margin printing mode when the first or last character of the line is wider than ordinary width.
  • the last character of the line- is a wide-character as shown in Fig. 4A, it does not extend over the right margin.
  • the first character of the line is a wide character as illustrated in Fig. 4B
  • the last character of the ordinary width does not extend over the right margin and vertically aligned with the character of the preceding line at the corresponding position.

Landscapes

  • Dot-Matrix Printers And Others (AREA)
EP84113151A 1983-11-30 1984-10-31 Imprimante matricielle par points Ceased EP0143995A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP225745/83 1983-11-30
JP22574583A JPS60116465A (ja) 1983-11-30 1983-11-30 プリンタ

Publications (2)

Publication Number Publication Date
EP0143995A2 true EP0143995A2 (fr) 1985-06-12
EP0143995A3 EP0143995A3 (fr) 1987-12-02

Family

ID=16834169

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84113151A Ceased EP0143995A3 (fr) 1983-11-30 1984-10-31 Imprimante matricielle par points

Country Status (3)

Country Link
EP (1) EP0143995A3 (fr)
JP (1) JPS60116465A (fr)
AU (1) AU553318B2 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4195353A (en) * 1977-01-14 1980-03-25 Ricoh Company, Ltd. Word processor comprising improved editing means
JPS54110735A (en) * 1978-02-20 1979-08-30 Ricoh Co Ltd Printer control system
US4372696A (en) * 1980-05-20 1983-02-08 Monarch Marking Systems, Inc. High quality printer

Also Published As

Publication number Publication date
AU553318B2 (en) 1986-07-10
JPS60116465A (ja) 1985-06-22
AU3479884A (en) 1985-06-06
EP0143995A3 (fr) 1987-12-02

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Inventor name: MIYASHITA, KAZUHISAC/O PATENT DIVISION