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WO1993010977A1 - Procede d'impression a jet d'encre continu - Google Patents

Procede d'impression a jet d'encre continu Download PDF

Info

Publication number
WO1993010977A1
WO1993010977A1 PCT/GB1992/002180 GB9202180W WO9310977A1 WO 1993010977 A1 WO1993010977 A1 WO 1993010977A1 GB 9202180 W GB9202180 W GB 9202180W WO 9310977 A1 WO9310977 A1 WO 9310977A1
Authority
WO
WIPO (PCT)
Prior art keywords
printed
bar
raster
drops
printing
Prior art date
Application number
PCT/GB1992/002180
Other languages
English (en)
Inventor
Ammar Lecheheb
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
Priority to EP92923915A priority Critical patent/EP0614417B1/fr
Priority to CA002124328A priority patent/CA2124328A1/fr
Priority to JP5509933A priority patent/JPH07501281A/ja
Priority to DE69208890T priority patent/DE69208890D1/de
Publication of WO1993010977A1 publication Critical patent/WO1993010977A1/fr

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
    • 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 substrata 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 speed constraints are such that with current machines, it is not possible to design a raster with few enough guard drops to attain the required performance.
  • the first printhead drop is decelerated most and the second drop catches up with it, so that, without a guard drop, the first and second drop are likely to coalesce and form a single large drop at the beginning of the stroke as shown in figure 2. If this does not occur, the delay in the initial drop will manifest itself as a misalignment or hook at the begining of the stroke as shown in figure 3.
  • the present invention is intended to provide a solution to this problem, by enabling high speed and uniform lines to be printed.
  • a method of high speed printing of bar codes with a continuous ink jet printer in which bars of varying length or in varied positions are printed by using a different raster of drops for each bar or at least for different bars and by switching rasters in real time to print the appropriate bar.
  • Figure 1 illustrates a conventionally printed line of droplets for a bar code
  • Figure 2 illustrates another conventionally printed line of droplets for a bar code
  • Figure 3 illustrates a further line of droplets for a bar code in accordance with a prior art technique
  • Figures 4 & 5 illustrate BPO 4 state bar code strokes and USPO Postnet bar code strokes respectively produced by the technique of the present invention
  • Tables 1 and 2 show conventional rasters for printing bar codes
  • Tables 3 to 6 show rasters used in accordance with the present invention.
  • the rasters of tables 4 and 5 provide excellent print quality, well within the specifications of both the postal bar codes mentioned above.
  • the three dot bar shown in figure 4 may be printed using the same raster as that of table 5, without the final 5 drops (drop positions 9-13) being printed, ie drop numbers 8 onwards in the raster all being uncharged drops and thus not being deflected for printing.
  • 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.
  • a host computer can download bytes of data, relating to the bars to be printed, to an ink jet printer and a memory in the printer which contains a raster sequence of droplets can then be accessed according to the respective types of bar and in order to provide respective commands to the printhead for printing of the required drops.
  • a high level byte of data can be downloaded to the printer and converted to two 7-bit bytes which are stored in a printer buffer.
  • Bits 1 to 12 may provide a code for the various bars (of 12 dots) to be printed and bits 13 and 14 used to select the related raster.
  • the buffer may be sequentially fed with data until full.
  • bits stored in the buffer are read sequentially, bits 13 and 14 being used to select the respective raster and bits l to 12 read sequentially to enable charge voltages from a look-up table to be applied to the droplets in order to cause the drops to be deflected to the corrct position.

Landscapes

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

Abstract

On effectue l'impression à vitesse élevée de codes à barres postaux au moyen d'une imprimante à jet d'encre continu par l'intermédiaire de l'introduction en temps réel de trames entre les traits pour différentes barres.
PCT/GB1992/002180 1991-11-29 1992-11-25 Procede d'impression a jet d'encre continu WO1993010977A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP92923915A EP0614417B1 (fr) 1991-11-29 1992-11-25 Procede d'impression a jet d'encre continu
CA002124328A CA2124328A1 (fr) 1991-11-29 1992-11-25 Impression au moyen d'un jet d'encre continu
JP5509933A JPH07501281A (ja) 1991-11-29 1992-11-25 連続インクジェット印刷
DE69208890T DE69208890D1 (de) 1991-11-29 1992-11-25 Kontinuierlich arbeitender tintenstrahldrucker

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB919125466A GB9125466D0 (en) 1991-11-29 1991-11-29 Continuous ink jet printing
GB9125466.4 1991-11-29

Publications (1)

Publication Number Publication Date
WO1993010977A1 true WO1993010977A1 (fr) 1993-06-10

Family

ID=10705475

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1992/002180 WO1993010977A1 (fr) 1991-11-29 1992-11-25 Procede d'impression a jet d'encre continu

Country Status (6)

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

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2116824A1 (es) * 1994-02-10 1998-07-16 Domino Amjet Iberica S A Dispositivo para impresion y cancelacion de correspondencia postal.
WO1999065688A1 (fr) * 1998-06-12 1999-12-23 Marconi Data Systems Inc., Perfectionnement du positionnement des points pour une imprimante a a jet d'encre continu
WO2003035399A1 (fr) * 2001-10-22 2003-05-01 Videojet Technologies Inc. Procede d'impression pour imprimante a jet d'encre continu
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
WO2009134671A1 (fr) * 2008-04-28 2009-11-05 Videojet Technologies Inc. Procédé d’impression

Citations (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
EP0054921A2 (fr) * 1980-12-19 1982-06-30 Hitachi, Ltd. Méthode pour diminuer la déviation d'impression d'un appareil à écrire à gouttes d'encre
US4491852A (en) * 1982-07-02 1985-01-01 Ricoh Company, Ltd. Ink jet printing apparatus using guard drops
EP0206614A1 (fr) * 1985-06-11 1986-12-30 Domino Printing Sciences Plc Impression à l'aide d'un jet d'encre continu

Patent Citations (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
EP0054921A2 (fr) * 1980-12-19 1982-06-30 Hitachi, Ltd. Méthode pour diminuer la déviation d'impression d'un appareil à écrire à gouttes d'encre
US4491852A (en) * 1982-07-02 1985-01-01 Ricoh Company, Ltd. Ink jet printing apparatus using guard drops
EP0206614A1 (fr) * 1985-06-11 1986-12-30 Domino Printing Sciences Plc Impression à l'aide d'un jet d'encre continu

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN vol. 24, no. 4, September 1981, pages 1810 - 1810 FEIGEL ET AL. 'DROP PLACEMENT SCHEME FOR ASPIRATED INK JET PRINTER' *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2116824A1 (es) * 1994-02-10 1998-07-16 Domino Amjet Iberica S A Dispositivo para impresion y cancelacion de correspondencia postal.
WO1999065688A1 (fr) * 1998-06-12 1999-12-23 Marconi Data Systems Inc., Perfectionnement du positionnement des points pour une imprimante a a jet d'encre continu
US6109739A (en) * 1998-06-12 2000-08-29 Marconi Data Systems Inc Dot positioning for continuous ink jet printer
AU763712B2 (en) * 1998-06-12 2003-07-31 Videojet Technologies Inc. Improved dot positioning for continuous ink jet printer
WO2003035399A1 (fr) * 2001-10-22 2003-05-01 Videojet Technologies Inc. Procede d'impression pour imprimante a jet d'encre continu
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
WO2009134671A1 (fr) * 2008-04-28 2009-11-05 Videojet Technologies Inc. Procédé d’impression
EP2280833B1 (fr) 2008-04-28 2015-12-02 Videojet Technologies, Inc. Procédé d'impression

Also Published As

Publication number Publication date
GB9125466D0 (en) 1992-01-29
EP0614417A1 (fr) 1994-09-14
EP0614417B1 (fr) 1996-03-06
CA2124328A1 (fr) 1993-06-10
DE69208890D1 (de) 1996-04-11
JPH07501281A (ja) 1995-02-09

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