EP0614417B1 - Kontinuierlich arbeitender tintenstrahldrucker - Google Patents

Kontinuierlich arbeitender tintenstrahldrucker Download PDF

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Publication number
EP0614417B1
EP0614417B1 EP92923915A EP92923915A EP0614417B1 EP 0614417 B1 EP0614417 B1 EP 0614417B1 EP 92923915 A EP92923915 A EP 92923915A EP 92923915 A EP92923915 A EP 92923915A EP 0614417 B1 EP0614417 B1 EP 0614417B1
Authority
EP
European Patent Office
Prior art keywords
printed
guard
drops
bar
raster
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
EP92923915A
Other languages
English (en)
French (fr)
Other versions
EP0614417A1 (de
Inventor
Ammar Lecheheb
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.)
Domino Printing Sciences PLC
Original Assignee
Domino Printing Sciences PLC
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 Domino Printing Sciences PLC filed Critical Domino Printing Sciences PLC
Publication of EP0614417A1 publication Critical patent/EP0614417A1/de
Application granted granted Critical
Publication of EP0614417B1 publication Critical patent/EP0614417B1/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
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/07—Ink jet characterised by jet control
    • B41J2/075—Ink jet characterised by jet control for many-valued deflection

Definitions

  • the present invention relates to continuous ink jet printing and, more particularly to such printing when applied to the printing of bar codes such as those used in retailing or by postal authorities.
  • Continuous ink jet printers are widely used for industrial coding and marking applications.
  • a jet of ink is broken into a regular stream of uniform ink droplets which is then passed through a transverse electric field provided across a pair of deflector plates.
  • droplets are not charged and are caught in a gutter to be recycled. If a droplet is charged, it is deflected from the recycling path by the electric field and is printed. Since the field across the deflector plates is constant, the deflection is proportional to the magnitude of the charge.
  • the object or substrate being printed is generally moved at right angles to the deflection direction and this, together with deflection of droplets by varying amounts, provides the means for placing droplets at the desired position in a two dimensional array.
  • a common raster, or sequence of printable (but not necessarily printed) and non-printable (uncharged) droplets is used to print each stroke of a line of print, in order to provide an acceptable linear response.
  • each stroke of print is produced by the same number and sequence of printable and non-printable droplets, but the actual printable droplets which are printed will vary from stroke to stroke.
  • the linearity of the strokes is particularly important when bar codes are being printed.
  • Various techniques are already known for optimising the placement of droplets by using carefully designed rasters in which a predefined sequence of charged and non-charged droplets is used for each stroke. See for example EP-A-0206614.
  • table 1 shows an interleaved raster in which sequential droplets numbered 1 to 9 are printed in interleaved droplet positions as indicated.
  • Drops 1 and 2 for instance are printed at positions 1 and 5 on the substrate so that their flight paths are widely separated and there is little or no interaction. At high speed, however, this tends to produce a ragged line as shown in figure 1 and this is unacceptable for barcoding.
  • Different segments of a vertical stroke may be printed to form a character by using uncharged drops rather than charged drops at the appropriate point within the raster.
  • Postal bar codes in particular, demand very high speed operation and a selection of bars and half bars in the case of USPS Postnet code (figure 5) or four different bars for the British Post Office BPO 4 State Code (figure 4).
  • the present invention is intended to provide a solution to the problem of printing British Post Office BPO 4 State Codes.
  • the invention also includes a printer adapted to carry out the above method.
  • the first printed drop of a stroke suffers greatest from aerodynamic deceleration forces. It is found that if a series of drops are printed in sequence, an acceptable 12 drop line (as shown in the first bar in figure 4) may be printed with the 17 drop raster shown in table 3. Only 5 guard droplets are necessary. Use of this raster in the conventional way to print the eight drop bars or lines of figure 4 produces unacceptable print quality. However, it is possible to design excellent rasters for the remaining strokes, especially with the freedom of an additional 5 guard drops. For instance, the rasters of tables 4 and 5 provide excellent print quality, well within the specifications of both the postal bar codes mentioned above. This raster provides the important guard drop between the first and second drops of the raster.
  • Table 6 illustrates the rasters used for printing the section of bar code shown in figure 4, a different raster being used for each bar of print.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)
  • Printers Characterized By Their Purpose (AREA)

Claims (2)

  1. Verfahren zum Hochgeschwindigkeitsdrucken von Strichcodes mit einem kontinuierlich arbeitenden Tintenstrahldrucker, bei dem Striche unterschiedlicher Länge oder an unterschiedlichen Stellen gedruckt werden durch Verwendung eines unterschiedlichen Tropfenrasters für jeden Strich oder zumindest für verschiedene Striche und durch Wechsel von Rastern in Realzeit zum Drucken des entsprechenden Strichs, dadurch gekennzeichnet, daß
       zum Drucken von Strichcodes mit maximal 12 gedruckten Tropfen pro Strich:
       ein ganzer Strich unter Verwendung eines Rasters von 17 erzeugten Tropfen gedruckt wird, von denen der 2., 4., 6., 8. und 10 nicht gedruckte Schutztropfen sind;
       ein Strich aus 8 gedruckten Tröpfchen unter Verwendung eines Rasters von 17 erzeugten Tropfen gedruckt wird, von denen entweder der 2., 4., 6., 8., 10. und 14. bis 17. oder der 1. bis 6., 8., 9. und 11. nicht gedruckte Schutztropfen sind; und
       ein Strich aus 4 gedruckten Tröpfchen unter Verwendung eines Rasters von 17 erzeugten Tropfen gedruckt wird, von denen der 1. bis 6., 8. bis 10. und 14. bis 17. nicht gedruckte Schutztropfen sind.
  2. Kontinuierlich arbeitender Tintenstrahldrucker zum Drucken von Strichcodes, wobei der Drucker eine Speichereinrichtung zum Speichern einer Rastersequenz druckbarer und nichtdruckbarer Tropfen für eine Anzahl verschiedener Striche sowie eine Einrichtung zum Drucken von Strichen eines Strichcodes durch Wechsel zwischen den gespeicherten Rastersequenzen zwischen den verschiedenen Strichen besitzt, dadurch gekennzeichnet, daß
       der Drucker zum Drucken von Strichcodes mit maximal 12 gedruckten Tropfen pro Strich ausgelegt ist,
       wobei ein ganzer Strich unter Verwendung eines Rasters von 17 erzeugten Tropfen gedruckt ist, von denen der 2., 4., 6., 8. und 10. nicht gedruckte Schutztropfen sind;
       ein Strich aus 8 gedruckten Tröpfchen unter Verwendung eines Rasters von 17 erzeugten Tropfen gedruckt ist, von denen entweder der 2., 4., 6., 8., 10. und 14. bis 17. oder der 1. bis 6., 8., 9. und 11. nicht gedruckte Schutztropfen sind; und
       ein Strich aus 4 gedruckten Tröpfchen unter Verwendung eines Rasters von 17 erzeugten Tropfen gedruckt ist, von denen der 1. bis 6., 8. bis 10. und 14. bis 17. nicht gedruckte Schutztropfen sind.
EP92923915A 1991-11-29 1992-11-25 Kontinuierlich arbeitender tintenstrahldrucker Expired - Lifetime EP0614417B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9125466 1991-11-29
GB919125466A GB9125466D0 (en) 1991-11-29 1991-11-29 Continuous ink jet printing
PCT/GB1992/002180 WO1993010977A1 (en) 1991-11-29 1992-11-25 Continuous ink jet printing

Publications (2)

Publication Number Publication Date
EP0614417A1 EP0614417A1 (de) 1994-09-14
EP0614417B1 true EP0614417B1 (de) 1996-03-06

Family

ID=10705475

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92923915A Expired - Lifetime EP0614417B1 (de) 1991-11-29 1992-11-25 Kontinuierlich arbeitender tintenstrahldrucker

Country Status (6)

Country Link
EP (1) EP0614417B1 (de)
JP (1) JPH07501281A (de)
CA (1) CA2124328A1 (de)
DE (1) DE69208890D1 (de)
GB (1) GB9125466D0 (de)
WO (1) WO1993010977A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102015318B (zh) * 2008-04-28 2012-11-14 录象射流技术公司 打印方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2116824B1 (es) * 1994-02-10 1999-03-16 Domino Amjet Iberica S A Dispositivo para impresion y cancelacion de correspondencia postal.
US6109739A (en) * 1998-06-12 2000-08-29 Marconi Data Systems Inc Dot positioning for continuous ink jet printer
US6843555B2 (en) 2001-10-22 2005-01-18 Videojet Technologies Inc. Printing method for continuous ink jet printer
US7279511B2 (en) 2002-12-09 2007-10-09 Videojet Technologies Inc. Opaque ink jet ink composition
US7347539B2 (en) 2004-06-17 2008-03-25 Videojet Technologies Inc. System and method for auto-threshold adjustment for phasing

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4086601A (en) * 1976-03-30 1978-04-25 International Business Machines Corporation Sequential ink jet printing system with variable number of guard drops
JPS57103852A (en) * 1980-12-19 1982-06-28 Hitachi Ltd Ink jet recorder
US4491852A (en) * 1982-07-02 1985-01-01 Ricoh Company, Ltd. Ink jet printing apparatus using guard drops
GB8514751D0 (en) * 1985-06-11 1985-07-10 Domino Printing Sciences Plc Ink jet printing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102015318B (zh) * 2008-04-28 2012-11-14 录象射流技术公司 打印方法

Also Published As

Publication number Publication date
EP0614417A1 (de) 1994-09-14
JPH07501281A (ja) 1995-02-09
WO1993010977A1 (en) 1993-06-10
GB9125466D0 (en) 1992-01-29
CA2124328A1 (en) 1993-06-10
DE69208890D1 (de) 1996-04-11

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