EP0387079B1 - Divisional step dot printer - Google Patents

Divisional step dot printer Download PDF

Info

Publication number
EP0387079B1
EP0387079B1 EP90302525A EP90302525A EP0387079B1 EP 0387079 B1 EP0387079 B1 EP 0387079B1 EP 90302525 A EP90302525 A EP 90302525A EP 90302525 A EP90302525 A EP 90302525A EP 0387079 B1 EP0387079 B1 EP 0387079B1
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.)
Expired - Lifetime
Application number
EP90302525A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0387079A1 (en
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/en
Application granted granted Critical
Publication of EP0387079B1 publication Critical patent/EP0387079B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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 dot printing device for a wire dot printer comprises: a dot printing head having a plurality of dot pins; a print medium on which printing by said dot pins is carried out; and a platen arranged opposite to said dot printing head and on which said print medium for dot printing is placed; said plurality of dot pins of said dot printing head are divided into a plurality of groups of a sequence of dot pins and are driven in a sequence of divisional dot printing steps; each group of said dot pin groups is constituted by a continuous sequence of dot pins; each of said divisional dot printing steps is carried out by a combination of groups of dot pins, such that dot pins on both sides of the centre line of said 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 Divisional step dot printer Expired - Lifetime EP0387079B1 (en)

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=13113407

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90302525A Expired - Lifetime EP0387079B1 (en) 1989-03-10 1990-03-09 Divisional step dot printer

Country Status (7)

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

Families Citing this family (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

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3235676A1 (de) * 1982-09-27 1984-03-29 Siemens AG, 1000 Berlin und 8000 München Verfahren und anordnung zum darstellen von zeichen
JPH06102382B2 (ja) * 1984-12-28 1994-12-14 富士通株式会社 プリンタの分割印字装置
US4758103A (en) * 1986-04-15 1988-07-19 International Business Machines Corporation Method and apparatus for quieting the operation of a dot matrix printer
JPH07119116B2 (ja) * 1988-08-31 1995-12-20 沖電気工業株式会社 ２パス印字方法

Also Published As

Publication number Publication date
KR900014135A (ko) 1990-10-22
EP0387079A1 (en) 1990-09-12
CA2011689C (en) 1994-10-18
KR930011864B1 (ko) 1993-12-21
DE69004462D1 (de) 1993-12-16
JPH02235766A (ja) 1990-09-18
CA2011689A1 (en) 1990-09-10
JP2619521B2 (ja) 1997-06-11
ES2046693T3 (es) 1994-02-01
DE69004462T2 (de) 1994-03-10
IE64190B1 (en) 1995-07-12
IE900864L (en) 1990-09-10

Similar Documents

Publication Publication Date Title
US4540996A (en) Recording apparatus
JP4513802B2 (ja) 印刷装置
US4613871A (en) Guard drops in an ink jet printer
US4515487A (en) Multicolor printer
EP0186508B1 (en) Device for distributive dot printing
US5190382A (en) Print element arrangement in serial matrix printer
US5330276A (en) Divisional step dot printing device
JPS609909B2 (ja) インクジエツト印写装置
EP0387079B1 (en) Divisional step dot printer
EP0160318B1 (en) Printing system for dot-matrix printer
GB1509213A (en) Printing methods and apparatus
US4889052A (en) Paper feed control for a dot-line printer
US20060170730A1 (en) Print head system minimizing stitch error
US4741636A (en) Dot drive circuit of wire dot type printer
US5793939A (en) Print controlling apparatus
US5740332A (en) Image forming device
JPH0771852B2 (ja) インクジェットプリンタ
EP1075953B1 (en) A method of printing a substrate
JPS6141559A (ja) ドツトマトリツクスプリンタ
EP0439162A2 (en) Thermal printer
EP1073967B1 (en) Method of operating computerized printer heads
JPS5919170A (ja) 印字装置
EP0264909B1 (en) Impact printer
JPH04197663A (ja) 印刷装置
JP3958823B2 (ja) カラーインクジェットプリンタ

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR GB

17P Request for examination filed

Effective date: 19901207

17Q First examination report despatched

Effective date: 19920707

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR GB

REF Corresponds to:

Ref document number: 69004462

Country of ref document: DE

Date of ref document: 19931216

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2046693

Country of ref document: ES

Kind code of ref document: T3

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 19960328

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19970310

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 19990301

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20040309

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20050304

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20050309

Year of fee payment: 16

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20051130

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20051130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060309

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20061003

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20060309