EP0387079A1 - Teilschritt-Punktdrucker - Google Patents

Teilschritt-Punktdrucker Download PDF

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Publication number
EP0387079A1
EP0387079A1 EP90302525A EP90302525A EP0387079A1 EP 0387079 A1 EP0387079 A1 EP 0387079A1 EP 90302525 A EP90302525 A EP 90302525A EP 90302525 A EP90302525 A EP 90302525A EP 0387079 A1 EP0387079 A1 EP 0387079A1
Authority
EP
European Patent Office
Prior art keywords
dot
divisional
printing
pins
groups
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
EP90302525A
Other languages
English (en)
French (fr)
Other versions
EP0387079B1 (de
Inventor
Toshifumi Tanida
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
Publication of EP0387079A1 publication Critical patent/EP0387079A1/de
Application granted granted Critical
Publication of EP0387079B1 publication Critical patent/EP0387079B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
    • 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
    • B41J2/5056—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 using dot arrays providing selective dot disposition modes, e.g. different dot densities for high speed and high-quality printing, array line selections for multi-pass printing, or dot shifts for character inclination

Definitions

  • the present invention relates to a divisional step dot printing device for a wire dot printer.
  • the device according to the present invention can be used for a wire dot type serial printer used, for example, in an electronic computer system.
  • all of the dot pins are divided into a plurality of groups each consisting of a plurality of successive dot pins, and a first group of dot pins is driven in a first divisional step during a first travel of a carriage over the length of a platen, the next group of dot pins is driven in the next divisional step during the next travel of the carriage over the length of the platen, and the succeeding group of dot pins is driven in the next divisional step during the next travel of the carriage over the length of the platen.
  • one row of printing is constituted by a plurality of parts thereof, and the printing of this plurality of parts is carried out sequentially to print one row.
  • all of the dot pins are divided into a plurality of groups each consisting of a plurality of dot pins, at intervals of two dot pin positions, and a first group is driven in the first divisional step during the first travel of a carriage over the length of a platen, the next group is driven in the next divisional step during the next travel of a carriage over the length of a platen, and the succeeding group is driven in the next divisional step during the next travel of the carriage over the length of the platen.
  • one row of printing is constituted by a plurality of row constituents, and the printing of this plurality of row constituents are carried out sequentially to accomplish the printing of one row.
  • An object of the present invention is to provide an improved divisional step dot printing device in which an undesirable shift of the paper during the divisional dot printing steps is prevented and in which, a satisfactory density of print is obtained.
  • a divisional step wire dot printer comprises: a dot printing head having a plurality of dot pins, a platen arranged opposite the dot printing head and which, in use, carries a print medium, and driving means for driving the plurality of dot pins which divides the dot pins into a plurality of groups each of which contains a sequence of adjacent dot pins and drives the groups in a sequence of divisional printing steps, a combination of groups being driven in each of the sequence of divisional printing steps so that dot pins on both sides of a centre line of the print head extending in the direction of the axis of the platen are driven in each divisional printing step.
  • a dot printer to which the device according to the present invention is to be applied is constituted by a platen 11, a paper 12 to be printed, and a carriage 21 on which a printing head 22 is mounted.
  • a one line sequence of wire dot pins P1, P2, ... P24 is arranged as shown in Fig. 2. Note, it is possible to arrange a two line sequence of wire dot pins.
  • the selected ones of the dot pins P1, P2, ... P24 are driven to strike the paper 12 on the platen 11, to carry out a printing operation on the paper 12.
  • One row of printing on the paper 12 by the dot pins P1, P2, ... P24 is carried out during one travel of the carriage 21 over the length of the platen 11 or during a plurality of travels of the carriage 21 over the length of the platen 11.
  • the latter type printing is called a divisional step dot printing.
  • FIGs. 3 and 4 A prior art method of divisional step dot printing is illustrated in Figs. 3 and 4.
  • all of the dot pins P1, P2, ... P24 are divided into three groups, GROUP 1, GROUP 2, AND GROUP 3, each consisting of 8 successive dot pins.
  • a driven dot is expressed by a block dot.
  • GROUP 1 consisting of P1, P2, ... P8 is driven in the first divisional step during the first travel of the carriage 21 over the length of the platen 11
  • GROUP 2 consisting of P9, P10, ... P16 is driven in the second divisional step during the second travel of the carriage 21 over the length of the platen 11
  • GROUP 3 consisting of P17, P18, ...
  • one row of printing is constituted by three parts, upper, middle, and lower, and the printing of these three parts is carried out sequentially to print one row.
  • FIGs. 5 and 6 Another prior art method of divisional step dot printing is illustrated in Figs. 5 and 6.
  • all of the dot pins P1, P2, ... P24 are divided into three groups, GROUP 1, GROUP 2, and GROUP 3, each consisting of 8 dot pins at intervals of two dot pin positions.
  • GROUP 1 consisting of P1, P4, P7, P10, P13, P16, P19, and P22 is driven in the first divisional step during the first travel of the carriage 21 over the length of the platen 11
  • GROUP 2 consisting of P2, P5, P8, P11, P14, P17, P20, and P23 is driven in the second divisional step during the second travel of the carriage 21 over the length of the platen 11
  • GROUP 3 consisting of P3, P6, P9, P12, P15, P18, P21, and P24 is driven in the third divisional step during the third travel of the carriage 21 over the length of the platen 11.
  • one row of printing is constituted by a plurality of row constituents, and the printing of this plurality of row constituents is carried out sequentially to print one row.
  • U.S. Patent No. 4743127 U.S. Patent No. 4743127.
  • a divisional dot printing device according to an embodiment of the present invention will be described with reference to Fig. 8.
  • the operation of the divisional dot printing device shown in Fig. 8 is applicable to the dot printer shown in Figs. 1 and 2.
  • all of the dot pins P1, P2, ... P24 are divided into six groups, i.e., G11, G21, G31, G32, G12, and G22, and the printing is carried out in a sequence of divisional steps, i.e., a first divisional step, a second divisional step, and a third divisional step.
  • Each of the groups G11, G21, G31, G32, G12, and G22 is constituted by a sequence of successive dot pins, i.e., G11 by P1, P3, P5, and P7, G21 by P9, P11, P13, and P15, G31 by P17, P19, P21, and P23, G32 by P2, P4, P6, and P8, G12 by P10, P12, P14, and P16, and G22 by P18, P20, P22, and P24.
  • each of the combination of the driven groups of dot pins i.e., G11 and G12 in the first divisional step, G21 and G22 in the second divisional step, and G31 and G32 in the third divisional step, substantially cover the center line of the platen 11. Namely, in the first divisional step, G12 directly covers the center line, in the second divisional step, G21 directly covers the center line, and in the third divisional step, G31 and G32 hold the center line therebetween.
  • each of the groups G11, G21, G31, G32, G12, and G22 is constituted by a sequence of successive dot pins and the interval between adjacent dot pins in any of the groups is small, and accordingly, the force of the impact of the dot pins onto the paper to be printed is increased, and thus the density of the colors printed by the divisional step printing sequence is increased.
  • the printing operations on the paper in the first, the second, and the third divisional steps are located in neighbouring positions or at similar positions, and thus the undesirable shifting of the paper as in the prior art is prevented, and accordingly, a satisfactory result is obtained by the divisional step printing sequence.
  • the dot pins P1 to P24 are arranged in a zigzag fashion in two columns, as shown in Fig. 1.
  • the odd number pins P1 to P23 are in the left column, and the even number pins P2 to P24 are in the right column.
  • the groups G11 and G12 of dot pins strike the upper and middle parts of the paper 12 on the platen 11
  • the groups G21 and G22 of dot pins strike the middle and lower parts of the paper 12 on the platen 11
  • the groups G32 and G31 of dot pins strike the upper and lower parts of the paper 12 on the platen 11.
  • the driven dot pins substantially cover the center line, and throughout the sequence of the first, second, and third divisional printing steps, the dot pins stroke at neighbouring positions or similar positions.
  • FIG. 11 A block diagram of a circuit of a divisional step printing device according to an embodiment of the present invention is shown in Fig. 11.
  • the device of Fig. 11 includes data registers 301, 302, and 303, a bus control circuit 31, AND gates 3211 to 3218, 3221 to 3228, and 3231 to 3238, an address decoder 33, latch circuits 341, 342, and 343, a current supply timer 35, AND gates 3611 to 3618, 3621 to 3628, and 3631 to 3638, a driver 37, and a printing head 22.
  • the first divisional step data registered in the data register 301 passes through AND gates 3211 to 3218, is latched by the latch circuit 341, passes through AND gates 3611 to 3618, and is then supplied to the driver 37 to drive the groups G11 and G12 of the dot pins.
  • the second divisional step data registered in the data register 302 passes through AND gates 3221 to 3228, is latched by the latch circuit 342, passes through AND gates 3621 to 3628, and is then supplied to the driver 37 to drive the groups G21 and G22 of the dot pins.
  • the third divisional step data registered in the data register 303 passes through AND gates 3231 to 3238, is latched by the latch circuit 343, passes through AND gates 3631 to 3638, and is then supplied to the driver 37 to drive the groups G31 and G32 of the dot pins.
  • step 1 valid signal, step 2 valid signal, and step 3 valid signal delivered from the bus control circuit 31 are made HIGH.
  • step 1 valid signal, step 2 valid signal, and step 3 valid signal delivered from the bus control circuit 31 are sequentially made HIGH.
  • the step 1, step 2, and step 3 valid signals delivered from the bus control circuit 31 are supplied to input terminals of the AND gates 3211 to 3218, 3221 to 3228, and 3231 to 3238.
  • the current supply timer 35 supplies an energiza­tion pulse having a predetermined duration to input terminals of the AND gates 3611 to 3618, 3621 to 3628, and 3631 to 3638.
  • the potential of the STEP 1 VALID SIGNAL from the bus control circuit 31 is made HIGH and the potentials of the STEP 2 and STEP 3 VALID SIGNALS are made LOW, the AND gates 3211 to 3218 are turned ON, and the groups G11 and G12 of dot pins are driven through the latch circuit 341, the AND gates 3611 to 3618, and the driver 37.
  • the potential of the STEP 2 VALID SIGNAL from the bus control circuit 31 is made HIGH and the potentials of the STEP 1 and STEP 3 VALID SIGNALs are made LOW, the AND gates 3221 to 3228 are turned ON, and the groups G21 and G22 of dot pins are driven through the latch circuit 342, the AND gates 3621 to 3628, and the driver 37.
  • the potential of the STEP 3 VALID SIGNAL from the bus control circuit 31 is made HIGH and the potentials of the STEP 1 and STEP 2 VALID SIGNALs are made LOW, the AND gates 3231 to 3238 are turned ON, and the groups G31 and G32 of dot pins are driven through the latch circuit 343, the AND gates 3631 to 3638, and the driver 37.
  • the potentials of all of the STEP 1, STEP 2, and STEP 3 VALID SIGNALs are made HIGH, all of the AND gates 3211 to 3218, 3221 to 3228, and 3231 to 3238 are turned ON, and all of the groups G11, G12, G21, G22, G31, and G32 of dot pins are driven through the latch circuits 341, 342, and 343, the AND gates 3611 to 3618, 3621 to 3628, and 3631 to 3638, and the driver 37.
  • a divisional step dot printing device The operation of a divisional step dot printing device according to another embodiment of the present invention is illustrated in Fig. 12.
  • the dot pins P1 to P24 are arranged in a single column, and are divided into groups of the successive dot pins: G11, G21, G31, G12, G22, and G32.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Impact Printers (AREA)
EP90302525A 1989-03-10 1990-03-09 Teilschritt-Punktdrucker Expired - Lifetime EP0387079B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP59442/89 1989-03-10
JP1059442A JP2619521B2 (ja) 1989-03-10 1989-03-10 ドット印刷ヘッドの分割駆動方法

Publications (2)

Publication Number Publication Date
EP0387079A1 true EP0387079A1 (de) 1990-09-12
EP0387079B1 EP0387079B1 (de) 1993-11-10

Family

ID=13113407

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90302525A Expired - Lifetime EP0387079B1 (de) 1989-03-10 1990-03-09 Teilschritt-Punktdrucker

Country Status (7)

Country Link
EP (1) EP0387079B1 (de)
JP (1) JP2619521B2 (de)
KR (1) KR930011864B1 (de)
CA (1) CA2011689C (de)
DE (1) DE69004462T2 (de)
ES (1) ES2046693T3 (de)
IE (1) IE64190B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4110776A1 (de) * 1991-03-28 1992-10-01 Mannesmann Ag Verfahren zum aufzeichnen von informationen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0104628A2 (de) * 1982-09-27 1984-04-04 Siemens Aktiengesellschaft Verfahren und Anordnung zum Darstellen von Zeichen
US4743127A (en) * 1984-12-28 1988-05-10 Fujitsu Limited Device for distributive dot printing for printer
US4758103A (en) * 1986-04-15 1988-07-19 International Business Machines Corporation Method and apparatus for quieting the operation of a dot matrix printer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07119116B2 (ja) * 1988-08-31 1995-12-20 沖電気工業株式会社 ２パス印字方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0104628A2 (de) * 1982-09-27 1984-04-04 Siemens Aktiengesellschaft Verfahren und Anordnung zum Darstellen von Zeichen
US4743127A (en) * 1984-12-28 1988-05-10 Fujitsu Limited Device for distributive dot printing for printer
US4758103A (en) * 1986-04-15 1988-07-19 International Business Machines Corporation Method and apparatus for quieting the operation of a dot matrix printer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4110776A1 (de) * 1991-03-28 1992-10-01 Mannesmann Ag Verfahren zum aufzeichnen von informationen

Also Published As

Publication number Publication date
JPH02235766A (ja) 1990-09-18
IE900864L (en) 1990-09-10
DE69004462T2 (de) 1994-03-10
ES2046693T3 (es) 1994-02-01
KR930011864B1 (ko) 1993-12-21
DE69004462D1 (de) 1993-12-16
KR900014135A (ko) 1990-10-22
EP0387079B1 (de) 1993-11-10
CA2011689C (en) 1994-10-18
JP2619521B2 (ja) 1997-06-11
IE64190B1 (en) 1995-07-12
CA2011689A1 (en) 1990-09-10

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