EP3498479B1 - Verfahren zum drucken von breiten streifen eines bildes auf einem substrat - Google Patents

Verfahren zum drucken von breiten streifen eines bildes auf einem substrat Download PDF

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Publication number
EP3498479B1
EP3498479B1 EP18210373.9A EP18210373A EP3498479B1 EP 3498479 B1 EP3498479 B1 EP 3498479B1 EP 18210373 A EP18210373 A EP 18210373A EP 3498479 B1 EP3498479 B1 EP 3498479B1
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EP
European Patent Office
Prior art keywords
substrate
scanning direction
printing
printer
carriage
Prior art date
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Application number
EP18210373.9A
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English (en)
French (fr)
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EP3498479A1 (de
Inventor
Eduard T.H. De Grijs
Bianca P.S. Slaats
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.)
Canon Production Printing Holding BV
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Canon Production Printing Holding BV
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Publication of EP3498479A1 publication Critical patent/EP3498479A1/de
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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
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • 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
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0095—Detecting means for copy material, e.g. for detecting or sensing presence of copy material or its leading or trailing end
    • 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
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B41J3/4078—Printing on textile

Definitions

  • the invention relates to a method of printing on a substrate that has a texture in the form of repetitive surface features extending in a predetermined direction, in which method a scanning-type printer is used for printing an image on the substrate in a plurality of successive and adjacent swaths.
  • the invention relates to a method of printing on textile, wherein the textile fabric forms a repetitive structure wherein the warp yarns or the weft yarns can be considered as surface features that extend in a predetermined direction.
  • the invention is also applicable for printing on other structured media such as wood, for example, wherein the texture of the wood forms a repetitive pattern of darker and brighter stripes.
  • a scanning-type printer typically has a carriage that is driven to move in a main scanning direction across a print surface on which the substrate is placed, and an advance mechanism controls a relative movement of the substrate and the carriage in a sub-scanning direction normal to the main scanning direction and relative to the path of travel of the carriage in the main scanning direction.
  • Document WO2017043065 A1 discloses such a printer according to the preamble of the claim 1.
  • the carriage has at least one print head with a plurality of print elements aligned in the sub-scanning direction, so that a swath of an image can be printed in each scan pass of the carriage, with the width of the swath being determined by the number of successive print elements that are used for printing. Then, the substrate is advanced relative to the carriage by the width of the swath so that a next swath can be printed.
  • the method according to the invention is characterized by a step of determining a position of a boundary between adjacent swathes such that the boundary is aligned with said predetermined direction and has a predetermined spatial relationship to the repetitive surface features.
  • the positions of the boundaries may be selected such that they are formed in stripe-shaped areas of the repetitive surface features where defects such as gaps or overlaps are less visible than in other surface areas. This method thus prevents that the boundaries between adjacent swathes interfere with the texture in the form of repetitive surface features. Instead these boundaries are aligned with these features, making them indiscernible from each other.
  • the weft and warp yarns of the textile will frequently form a repetitive and regular pattern of voids between the threads.
  • These voids are parts of the substrate that cannot be printed on.
  • the substrate is aligned such that the voids are aligned in the main scanning direction of the printer, it is possible to form the swath boundaries at positions which coincide with a line of voids in the textile.
  • the optical density of the printed image will be low because the image is formed only on the threads but not on the voids there between. Consequently, defects at the swath boundaries are less visible than would be the case if the boundary would extend along a thread where the image density is high.
  • the boundaries may be placed on a stripe-shaped area of the wood texture where the contrast between the substrate surface and the printed image is small, so that defects are difficult to perceive.
  • the step of determining the positions of the boundaries may comprise a step of aligning the substrate on a print surface of the printer such that the stripe-shaped surface features extend in the main scanning direction of the printer.
  • the boundary between two adjacent swathes of the printed image does not have to be a straight line. Although each segment of the boundary has to extend in the main scanning direction, the position of the boundary in the sub-scanning direction may jump abruptly from one surface feature of the substrate to another. This is useful in order to avoid that the boundary crosses a surface feature where defects would be more visible, especially in the case that inevitable alignment errors have resulted in a slightly skewed position of the substrate relative to the main scanning direction or in cases where the surface features on the substrate do not extend along perfectly straight lines but are slightly curved, as in the case of a wood texture.
  • the invention also relates to a printer, in particular an ink jet printer that is configured for carrying out the method described above.
  • Fig. 1 shows an ink jet printer having a conveyer 10 in the form of an endless belt that may be driven to advance a print substrate 12 in a sub-scanning direction x relative to a gantry 14 that extends across the entire width of the conveyer.
  • a carriage 16 is driven for reciprocating movement along the gantry 14 in a main scanning direction ⁇ z.
  • a number of ink jet print heads 18 are mounted on the carriage 16 to face the top surface of the print substrate 12.
  • Each print head 18 has a linear array of print elements 20 (nozzles) extending in the sub-scanning direction x.
  • An electronic controller 22 is provided for controlling the advance movement of the conveyer 10, the movements of the carriage 16 and the operations of the print elements 20 of the print heads 18.
  • the print elements 20 may be activated in accordance with image information of an image to be printed in order to print a swath of the image onto the substrate 12.
  • the maximum width of the swath is given by the length of the array of print elements 20 in the sub-scanning direction. However, it is possible to print a swath with a smaller width by leaving one or more print elements and the ends of each array silent.
  • the conveyer 10 is driven to advance the substrate 12 by the width of the swath in the sub-scanning direction x, and the carriage then moves in the opposite direction -z in order to print a subsequent swath of the image.
  • the carriage 16 has two optical scanners 24 disposed on opposite sides of the row of print heads 18.
  • one of the scanners 24 is always capable of scanning a swath of the print substrate 12 before the print elements 20 are activated for printing an image on that swath.
  • the field of view of the scanners 24 in the sub-scanning direction x is larger than the maximum width of the swathes to be printed, but it is sufficient that an area around the swath boundary is in the field of view of the scanners.
  • the optical images of the surface of the substrate 12 as captured by the scanners 24 are processed and analyzed in an image processor 26 within the controller 22.
  • the print substrate 12 is a square sheet of a textile material having weft threads 28 and warp threads 30 with voids 32 being lift between each pair of adjacent threads. Further, in this example, the weft threads 28 and warp threads 30 are inclined at an angle of 45° relative to the edges of the square contour of the substrate 12.
  • the substrate 12, on the other hand, has been placed on the conveyer 10 in an orientation rotated by 45°, so that not the edges of the substrate but the weft threads 28 extend (essentially) in the main scanning direction z.
  • the image processor 26 analyses the image captured by the leading one of the scanners 24 to detect the positions of the weft threads 28 and warp threads 30 in the portion of the substrate on which an image is going to be printed. On the basis of these positions, the controller 22 determines the position and shape of the boundaries of the swath that is going to be printed. It will be understood that a neighboring swath, on the top side of the gantry 14 in Fig. 1 , has already been printed in the preceding scan pass, so that the boundary between that previous swath and the swath that is to be printed now is fixed already. However, there is still freedom of choice to determine the position and shape of the lower boundary in Fig. 1 , i.e. the boundary between the present swath and the swath to be printed in the next scan pass.
  • the controller 22 determines the position and shape of that boundary so as to avoid the positions where a weft thread 28 is present.
  • the print elements 20 will be controlled so as to print ink dots only on the weft threads 28 and the warp threads 30 of the substrate but not in the areas of the voids 32, because the ink jetted into the voids 32 would not be applied to the substrate 12 anyway, but would only stain the belt of the conveyer 10. Consequently, the boundaries between adjacent swaths of the image will be visible only on the warp threads 30, and the boundary line will be disrupted by the voids 32 and will consequently consist only of a series of non-connected small segments, each segment having only the width of a single warp thread 30.
  • Fig. 2 illustrates a case where, due to an alignment error (which has been exaggerated in the drawing), the weft threads 28 are not exactly parallel to the main scanning direction z but form a small angle therewith.
  • Fig. 2 further shows, as a bold line, a boundary 34 between a swath 36 that has just been printed and a swath 38 that is going to be printed next.
  • the boundary 34 be a straight line, then the boundary would inevitably cross one or more of the weft threads 28 where any possible defects would be more visible. This is why, in this case, the boundary 34 has been determined to have a staircase shape constituted by segments that are offset relative to one another in the x-direction so as to avoid the positions of the weft threads 28.
  • Horizontal lines 40 in Fig. 2 indicate the x-positions of some of the print elements 20 of the print heads near the bottom end of the arrays in the swath 36.
  • the x-position of the boundary 34 can only vary in the raster of the lines 40. If one follows the boundary 34 in the direction from left to right in Fig. 2 , it can be seen that, whenever the boundary 34 approaches one of the weft threads 28, it is shifted to the next lower line 40 so as to remain in the gap between the two neighboring weft threads. If the boundary cannot be lowered further, because the end of the array of print elements 20 has been reached, it "jumps" upwards into the next higher gap between the weft threads 28.
  • Fig. 3 illustrates an example where a substrate 12, e.g. a veneer, has a repetitive pattern of stripe-shaped surface features 42 that differ in color and/or brightness.
  • An image to be printed on that substrate has, at least on the average, a relatively dark color, so that there is only little contrast between the image and the dark stripes of the surface features 42, whereas the contrast is significantly higher in the bright stripes of the surface features. Therefore, in order to reduce the visibility of any possible defects, the widths of swaths 44 - 54 to be printed in subsequent scan passes have been determined such that the boundaries 34 between these swaths are always located in the dark stripes. In the situation shown in Fig.
  • the swaths 44 and 46 have been printed already whereas the swath 48 is just in the process of being printed. Since the center line of the topmost dark stripe of the surface features 42 does not coincide with the top edge of the substrate 12', the first swath 44 has a larger width than the other swaths.
  • the width of the swath that is actually printed can always be adapted to the surface features 42 by appropriately selecting the number of print elements that contribute to the swath.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Textile Engineering (AREA)
  • Ink Jet (AREA)

Claims (12)

  1. Ein Verfahren zum Drucken auf ein Substrat (12; 12'), das eine Textur in der Form von einander wiederholenden Oberflächenmerkmalen (28; 42) aufweist, die sich in einer vorbestimmten Richtung erstrecken, bei welchem Verfahren ein abtastender Drucker dazu benutzt wird, in einer Vielzahl von aufeinanderfolgenden und aneinander angrenzenden Streifen (36, 38; 44-54) ein Bild auf das Substrat zu drucken, gekennzeichnet durch einen Schritt der dynamischen Bestimmung einer Position einer Grenze (34) zwischen aneinander angrenzenden Streifen derart, dass die Grenze (34) mit der genannten vorbestimmten Richtung ausgerichtet ist und eine vorbestimmte räumliche Beziehung zu den sich wiederholenden Oberflächenmerkmalen (28; 42) hat.
  2. Das Verfahren nach Anspruch 1, mit einem Schritt des Platzierens des Substrats (12; 12') auf einer Druckoberfläche (10) des Druckers in einer Orientierung, in welcher die genannte vorbestimmte Richtung der Oberflächenmerkmale (28; 42) parallel zu einer Hauptabtastrichtung (z) des Druckers ist.
  3. Das Verfahren nach Anspruch 2, bei dem die Positionen der Streifengrenzen (34) bestimmt werden durch Steuerung von Druckelementen (20) des Druckers, wobei diese Druckelemente in einem Array angeordnet sind, das sich in einer Unterabtastrichtung (x) rechtwinklig zu der Hauptabtastrichtung (z) erstreckt, und durch Bestimmung einer Anzahl von Druckelementen (20) in dem Array, die zum Drucken des Streifens benutzt werden.
  4. Das Verfahren nach Anspruch 3, bei dem die Streifengrenzen (34) so bestimmt werden, dass sie eine treppenförmige Gestalt haben, aufgebaut aus Segmenten, die zu der Hauptabtastrichtung parallel sind und in der Unterabtastrichtung (x) relativ zueinander versetzt sind.
  5. Das Verfahren nach einem der vorstehenden Ansprüche, zum Drucken auf Textilmaterial, das Kett- und Schussfäden aufweist, die ein sich wiederholendes regelmäßiges Muster von Freiräumen zwischen den Fäden bilden, wobei die Freiräume Teile sind, auf die nicht gedruckt werden kann (32) und die in der genannten vorbestimmten Richtung ausgerichtet sind, wobei die Grenzen (34) so bestimmt werden, dass ein Anteil der Grenze maximiert wird, der sich über diese Teile (32) des Substrats erstreckt.
  6. Das Verfahren nach einem der Ansprüche 1 bis 4, zum Drucken auf ein Substrat (12'), das streifenförmige Oberflächenmerkmale (42) aufweist, die sich in der Farbe und/oder Helligkeit unterscheiden, wobei die Grenzen (34) an Positionen gebildet werden, die minimalen Kontrast zwischen Pixeln des Bildes, die an der Grenze zu drucken sind, und dem Hintergrund auf der Oberfläche des Substrats (12') aufweisen.
  7. Das Verfahren nach einem der Ansprüche 1 bis 5, bei dem weiterhin eine Höhe der Oberflächenmerkmale bestimmt wird, um die Zeitpunkte des Aufbringens von Tinte für ein präziseres Auftreffen der Tintentröpfchen anzupassen.
  8. Ein abtastender Drucker zum Drucken auf ein Substrat, der folgendes aufweist:
    - einen Wagen (16), der relativ zu dem Substrat (12; 12') in einer Hauptabtastrichtung (z) bewegbar ist und Druckelemente (20) zum Drucken auf das Substrat aufweist;
    - einen Vorschubmechanismus (10), der eine relative Bewegung des Wagens (16) und des Substrats (12; 12') in einer Unterabtastrichtung (x) rechtwinklig zu der Hauptabtastrichtung (z) steuert; und
    - eine Steuereinrichtung (32) zur Steuerung von Operationen des Wagens (16), der Druckelemente (20) und des Vorschubmechanismus (10),
    dadurch gekennzeichnet, dass die Steuereinrichtung (22) dazu konfiguriert ist, ein Verfahren nach einem der Ansprüche 1 bis 7 auszuführen.
  9. Der Drucker nach Anspruch 8, mit einem Scanner (24), der dazu eingerichtet ist, das Substrat (12; 12') abzutasten, bevor ein Bild darauf gedruckt wird.
  10. Der Drucker nach Anspruch 9, bei dem der Scanner (24) auf dem Wagen (16) montiert ist.
  11. Der Drucker nach Anspruch 10, bei dem zwei Scanner (24) in der Hauptabtastrichtung (z) auf entgegengesetzten Seiten einer Anordnung von Druckköpfen (18), die die Druckelemente (20) aufweisen, auf dem Wagen (16) montiert sind.
  12. Ein Softwareprodukt mit Programmcode auf einem maschinenlesbaren nichtflüchtigen Medium, wobei der Programmcode, wenn er auf einer Steuereinrichtung eines Druckers nach Anspruch 8 läuft, die Steuereinrichtung veranlasst, ein Verfahren nach einem der Ansprüche 1 bis 7 auszuführen.
EP18210373.9A 2017-12-18 2018-12-05 Verfahren zum drucken von breiten streifen eines bildes auf einem substrat Active EP3498479B1 (de)

Applications Claiming Priority (1)

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EP17208099 2017-12-18

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EP3498479A1 EP3498479A1 (de) 2019-06-19
EP3498479B1 true EP3498479B1 (de) 2023-06-07

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6988797B2 (en) * 2003-03-12 2006-01-24 Hewlett-Packard Development Company, L.P. Unbacked fabric transport and condition system
US7052125B2 (en) * 2003-08-28 2006-05-30 Lexmark International, Inc. Apparatus and method for ink-jet printing onto an intermediate drum in a helical pattern
BE1018630A5 (nl) * 2009-01-20 2011-05-03 Flooring Ind Ltd Sarl Werkwijzen voor het vervaardigen van panelen en paneel hierbij bekomen.
JP6765794B2 (ja) * 2015-09-08 2020-10-07 キヤノン株式会社 画像処理装置、画像処理方法、および、プログラム

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