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EP1676705B1 - Imprimante - Google Patents

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Publication number
EP1676705B1
EP1676705B1 EP05112994A EP05112994A EP1676705B1 EP 1676705 B1 EP1676705 B1 EP 1676705B1 EP 05112994 A EP05112994 A EP 05112994A EP 05112994 A EP05112994 A EP 05112994A EP 1676705 B1 EP1676705 B1 EP 1676705B1
Authority
EP
European Patent Office
Prior art keywords
printing
image
print head
receiving member
printing device
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.)
Ceased
Application number
EP05112994A
Other languages
German (de)
English (en)
Other versions
EP1676705A1 (fr
Inventor
Hans Reinten
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 Netherlands BV
Original Assignee
Oce Technologies BV
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 Oce Technologies BV filed Critical Oce Technologies BV
Priority to EP05112994A priority Critical patent/EP1676705B1/fr
Publication of EP1676705A1 publication Critical patent/EP1676705A1/fr
Application granted granted Critical
Publication of EP1676705B1 publication Critical patent/EP1676705B1/fr
Ceased legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B41J2/205—Ink jet for printing a discrete number of tones

Definitions

  • the present invention is related to a printing device such as a printing or copying system employing print heads containing discharging elements, e.g. nozzles, for image-wise forming dots of a marking substance on an image-receiving member, where the marking substance is in fluid form when discharged.
  • a printing device such as a printing or copying system employing print heads containing discharging elements, e.g. nozzles, for image-wise forming dots of a marking substance on an image-receiving member, where the marking substance is in fluid form when discharged.
  • examples of such printing devices are inkjet printers and toner-jet printers.
  • inkjet printers Hereinafter reference will be made to inkjet printers.
  • Print heads employed in inkjet printers and the like usually each contain a plurality of nozzles arranged in (an) array(s).
  • the nozzles usually are placed substantially equidistant. The distance between two contiguous nozzles defines the nozzle pitch.
  • the nozzles are controlled to image-wise discharge fluid droplets of a marking substance on an image-receiving member.
  • the print heads are moveable in reciprocation across the image-receiving member, i.e. the main scanning direction, see for example US 5949450 .
  • the print heads are typically aligned in the sub scanning direction perpendicular to the main scanning direction.
  • a matrix of image dots of a marking substance, corresponding to a part of an original image is formed on the image-receiving member by image-wise activating nozzles of the print heads.
  • the printed matrix is generally referred to as a print swath, while the dimension of this matrix in the sub scanning direction is referred to as the swath width.
  • this displacement step is chosen equal to a swath width
  • an image can be printed in multiple non-overlapping swaths.
  • image quality may be improved by employing printing devices enabling the use of multiple printing stages, hence printed swaths are at least partially overlapping.
  • two main categories of such printing devices can be distinguished, i.e. so-called “interlace systems” and “multi-pass systems”.
  • the print head contains N nozzles, which are arranged in (a) linear array(s) such that the nozzle pitch is an integer multiple of the printing pitch. Multiple printing stages, or so-called interlacing printing steps, are required to generate a complete image or image part.
  • the print head and the image-receiving member are controlled such that in M printing stages, M being defined here as the nozzle pitch divided by the printing pitch, a complete image part is formed on the image-receiving member. After each printing stage, the image-receiving member is displaced over a distance of M times the printing pitch.
  • the print head is controlled such that only the nozzles corresponding to selected pixels of the image to be reproduced are image-wise activated.
  • an incomplete matrix of image dots is formed in a single printing stage or pass, i.e. one traverse of the print heads across the image-receiving member. Multiple passes are required to complete the matrix of image dots. In-between two passes the image-receiving member may be displaced in the sub scanning direction.
  • a scanning type bi-directional printing system i.e. a printing system capable of printing on the image-receiving member in reciprocation in the main scanning direction.
  • Such systems which may be "interlace systems” and “multi-pass systems” as well as combinations thereof, are known to be sensitive to gloss variations.
  • Gloss variations may occur when at least a part of the image dots of marking substance of the same or a different process colour are deposited in multiple printing stages in superimposition or at least partially overlapping and when the drying time of the image dots printed on the image-receiving member interacts with the time period required to render all pixels of an image part, i.e. the time period required to complete a sequence of printing stages defined by the print mask.
  • a delay signal is generated which causes the printer to interrupt printing immediately or after completion of the printing stage in progress.
  • printing of the subsequent printing stages is delayed till the cause of the delay is resolved and/or a resume signal is generated. This is observed to cause gloss banding on the print in progress.
  • a printing device as described in the preamble of claim 1, is provided for printing images on an image-receiving member in a sequence of printing stages wherein control means are provided for controlling, in an operative state of the printer, responsive to said delay signal the print head and the displacement means so that further printing is executed only on the stroke whereon printing is in progress till all printing stages of the sequence are completed for said stroke.
  • control means are provided for controlling, in an operative state of the printer, responsive to said delay signal the print head and the displacement means so that further printing is executed only on the stroke whereon printing is in progress till all printing stages of the sequence are completed for said stroke.
  • the printing device may be provided with means for generating a resume signal so that responsive to such resume signal printing may be resumed on a subsequent stroke of the image-receiving member contiguous to the printed strokes.
  • a delay or resume signal may be generated automatically by the printer. For instance, a delay signal may be generated because of a low ink level detection, or because a cleaning action of the print head is required, or another maintenance or service action is required. A resume signal may be generated after the requested intervention is completed. A delay signal or a resume signal may also be generated by user interaction.
  • the image-receiving member may be an intermediate image carrying member or a print medium.
  • the print medium can be in web or sheet form and may be composed of e.g. paper, cardboard, label stock, plastic or textile.
  • the so-called print mask contains the information about the number and sequence of printing stages and defines for each print head which discharging elements can be image-wise activated, or in other words contains the information defining for each printing stage which pixels will be rendered by which discharging elements such that when all printing stages are completed, all the pixels of the image concerned, or at least a part of such image, are rendered.
  • a print mask is associated with a printing mode. Selecting a printing mode enables the user to exchange image quality for productivity and vice versa dependent on his requirements. By selecting a printing mode also the discharging elements on the print heads which may be effectively used for image-wise activation are determined as well as the displacement step in the sub scanning direction after each printing stage.
  • the control means select for each said traverse of the print head in the main scanning direction an active portion of the plurality of discharging elements, each active portion of discharging elements being selected on the basis of the predetermined distance so that for substantially each position in the sub scanning direction on the part of the image-receiving member where the image is to be rendered, the traversing direction of the print head is the same for each first exposure to an active portion of the traversing print head.
  • Each traverse of the print head in operative state results in a printed portion of an image on the image-receiving member formed by a pattern of image dots of marking substance.
  • the image-receiving member is displaced with respect to the print head in the sub scanning direction either by displacing the image-receiving member or by displacing the print head.
  • a repetitive sequence of printing stages and corresponding displacement steps is used, each displacement step being defined by the relative displacement between the print head and the image-receiving member over a predetermined distance between respective subsequent printing stages.
  • each of the displacement steps may equal the same constant.
  • the present invention accomplishes that on substantially each position of the image-receiving member the traversing direction of the print head is the same for each first exposure to an active portion of the traversing print head.
  • the advantage thereof is that in the sub-scanning direction there are no time interval differences between the time of deposition of image dots originating from different traverses even when printing is temporarily interrupted due to a delay signal. Hence no gloss variations will occur or they will be at least severely reduced.
  • the selected active portion for a forward traverse may be different from the selected active portion for a backward traverse.
  • each active portion may selected such that the product of the number of discharging elements available in that active portion and the discharging element pitch is a non-zero integer multiple of the displacement distance.
  • the printing device of fig.1 is a scanning bi-directional inkjet printer comprising a roller (1) for supporting an image-receiving member (2) and moving it along four print heads (3), each of a different process colour.
  • the roller is rotatable about its axis as indicated by arrow A.
  • a scanning carriage (4) carries the four print heads and can be moved in reciprocation in the main scanning direction, i.e. the direction indicated by the double arrow B, parallel to the roller (1), such as to enable scanning of the image-receiving member in the main scanning direction.
  • the image-receiving member can be a medium in web or in sheet form and may be composed of e.g. paper, cardboard, label stock, plastic or textile.
  • the image-receiving member can also be an intermediate member, endless or not.
  • endless members which can be moved cyclically, are a belt or a drum.
  • the carriage (4) is guided on rods (5) (6) and is driven by suitable means (not shown).
  • Each print head comprises a number of discharging elements (7) arranged in a single linear array parallel to the sub scanning direction.
  • Four discharging elements per print head are depicted in the figure, however obviously in a practical embodiment typically several hundreds of discharging elements are provided per print head.
  • Each discharging element is connected via an ink duct to an ink reservoir of the corresponding colour.
  • Each ink duct is provided with means for activating the ink duct and an associated electrical drive circuit.
  • the ink duct may be activated thermally and/or piezoelectrically.
  • the ink duct When the ink duct is activated an ink drop is discharged form the discharge element in the direction of the roller (1) and forms a dot of ink on the image-receiving member.
  • the printer further comprises a controller (not shown) which controls among others the drive of the carriage, the print heads, the image-receiving member advancement, and the ink supply.
  • the printer is arranged to automatically detect a maintenance condition and to generate a delay signal, which delays printing according to the present invention.
  • the printer is also arranged to automatically detect the completion of the required intervention and will generate a resume signal such that printing can be resumed.
  • a digital image is to be formed.
  • a digital image may be created by scanning an original using a scanner.
  • Digital still images may also be created by a camera or a video camera.
  • digital images generated by a scanner or a camera which are usually in a bitmap format or a compressed bitmap format also artificially created, e.g. by a computer program, digital images or documents may be offered to printing device.
  • the latter images can be in a vector format.
  • the latter images can also be in a structured format including but not limited to a page description language (PDL) format and an extensible markup language (XML) format.
  • PDL page description language
  • XML extensible markup language
  • Examples of a PDL format are PDF (Adobe), PostScript (Adobe), and PCL (Hewlett-Packard).
  • the image processing system typically converts a digital image with known techniques into a series of bitmaps in the process colours of the printing device.
  • Each bitmap is a raster representation of a separation image of a process colour specifying for each pixel ("picture element") an image density value for said process colour.
  • picture element By image-wise activating the ink ducts in relation to the pattern(s) of image pixels an image composed of ink dots can be formed on the image-receiving member.
  • a printing device as depicted in Figure 1 is used to reproduce a digital image.
  • each print head is provided with 24 discharging elements, i.e. nozzles, arranged in a single linear array.
  • the nozzles are positioned equidistant at a resolution of 300 npi (nozzles per inch). This means that the nozzle pitch or element pitch, being the distance between the centres of two adjacent nozzles is about 85 ⁇ m.
  • the user selects a particular printing mode enabling to reproduce a digital image at a printing resolution of 300 dpi (dots per inch) in both the main scanning and the sub scanning directions, or in other words, the printing pitch, i.e. the distance between the centres of two contiguous dots of ink both in the main scanning direction and in the sub scanning direction, is about 85 ⁇ m.
  • the print mask as depicted in fig.2a is used.
  • the image is a multicolour image
  • the print mask as depicted in fig.2a defines a "multi-pass" system with two printing stages.
  • a first portion of the image is printed by image-wise activating selected nozzles of the active portion of the print head.
  • the image pattern resulting when activating all selected nozzles is indicated in fig.2b with black circles.
  • the active portion includes all 24 available nozzles.
  • This first printing stage coincides with a forward traverse of the print heads across the image-receiving member, i.e. a traverse from the left to the right. Then, the image-receiving member is advanced over a predetermined constant distance of 12 times the printing pitch to enable printing of a second portion of the image by image-wise activating a different selection of nozzles of the same active portion.
  • the image pattern resulting when activating all selected nozzles according to the second printing stage is indicated in fig.2b.
  • This second printing stage coincides with a backward traverse of the print heads across the image-receiving member, i.e. a traverse from the right to the left.
  • the image-receiving member is again advanced over the same constant distance being 12 times the nozzle pitch. Thereafter, the above-described sequence of printing stages and image-receiving member advancing is repeated till the last portion of the image is completed.
  • a delay signal is generated during execution of a second printing stage, i.e. during a backward traverse of the print head.
  • printing is in progress on a stroke (21) of the image-receiving member.
  • this stroke is still printed incompletely.
  • printing on strokes of the image-receiving member on which printing is already started is progressed without however starting printing on a subsequent stroke of the image-receiving member. In this example this means printing on stroke (21) is progressed till all printing stages required to completely render the image portion associated with this stroke are completed.
  • this stroke (21) the print head is advanced over a distance of 12 times the printing pitch. Thereafter, printing stage 1 is executed using only the upper half of the nozzles. Further referring to fig.2c, as stroke (21) is completed now, printing is delayed till the required intervention is completed. When resuming printing, the printing process is recovered with the strokes left blank during finishing of printing process.
  • One option is, as depicted in fig.2c, to advance the print head from the right to the left with all nozzles inactive. Thereafter, printing stage 1 is executed for the subsequent stroke using the complementary part of the print head, being the lower half of the nozzles. Thereafter printing can proceed according to the print mask till the complete image is printed.
  • a printing device as depicted in Figure 1 is used to reproduce a digital image.
  • each print head is provided with 12 discharging elements, i.e. nozzles, arranged in a single linear array.
  • the nozzles are positioned equidistant at a resolution of 300 npi (nozzles per inch). This means that the nozzle pitch or element pitch, being the distance between the centres of two adjacent nozzles is about 85 ⁇ m.
  • the user selects a particular printing mode enabling to reproduce a digital image at a printing resolution of 900 dpi (dots per inch) in both directions, or in other words, the printing pitch, i.e. the distance between the centres of two contiguous dots of ink both in the main scanning direction and in the sub scanning direction, is about 31 ⁇ m.
  • the print mask associated with the selected printing mode as in fig.3a defines an interlacing system.
  • the print mask defines a sequence of three printing stages required to completely render at least a part of the image. For each printing stage, i.e.
  • an active portion of the plurality of available discharging elements of the print head is selected.
  • the active portion when a printing stage coincides with a traverse of the print head from the left to the right, the active portion includes all 12 available nozzles.
  • the active portion when a printing stage coincides with a traverse of the print head from the right to the left, the active portion includes the six nozzles located in the middle of the print head while the upper three nozzles as well as the lower three nozzles are part of the inactive portion.
  • the active portion in each forward traverse and the active portion in each backward traverse are selected such that the swath width of each portion of an image printed in the forward traverse is twice the swath width of each portion of an image printed in the backward traverse.
  • the resulting dot pattern when activating all selected nozzles is indicated in fig.3b with black circles.
  • fig.3b For instruction purposes, only the dots generated by a single print head are shown and a full coverage image is assumed. In practice however, it is clear that in the same way multi-colour images can be formed by adequately timing both the driving of the respective print heads and the image-wise activation of the associated nozzles.
  • Each nozzle image-wise forms a complete line of image dots of ink in the main scanning direction. In the sub scanning direction only every third pixel is printed during the first printing stage. After the first printing stage is executed, the image-receiving member is advanced over a distance of 8 times the printing pitch. After the displacement step, the second printing stage is executed. In this second printing stage, i.e. a traverse from the right to the left, the active portion includes the 6 nozzles located in the middle of the print head, while the inactive portion includes both the lower and upper three nozzles. A dot pattern as schematically depicted in fig.3b is obtained. After the second printing stage is executed, the image-receiving member is again advanced over a distance of 8 times the printing pitch.
  • the third printing stage in this case a traverse from left to right, under normal operating conditions, again the full print head is employed. Under normal operating conditions, when the image is not yet completed, the image-receiving member is advanced over a distance of 11 times the printing pitch. Thereafter, the above-described sequence of printing stages, being stages 1, 2 and3, and corresponding image-receiving member advancement steps of 8, 8 and 11 printing pitches, is repeated till the image is completed.
  • the selection of the active portions in the forward and backward traverses respectively takes account of the image-receiving member displacement step so that for each position in the sub scanning direction on the part of the image-receiving member where the image is to be rendered, the traversing direction of the print head is the same for each first exposure to an active portion of the traversing print head.
  • a delay signal is generated during execution of a third printing stage, in this example during a forward traverse of the print head.
  • printing is in progress on a stroke (31) of the image-receiving member.
  • this stroke is still printed incompletely.
  • printing on strokes of the image-receiving member on which printing is already started is progressed without however starting printing on a subsequent stroke of the image-receiving member. In this example this means printing on stroke (31) is progressed till all printing stages required to completely render the image portion associated with this stroke are completed.
  • the print head is advanced over a distance of 11 times the printing pitch. Then, with reference to fig.3c, printing stage 1 is executed using, as this a traverse from the right to the left, as active portion of the print head the centre half of the nozzles. Subsequently the print head is advanced over a distance of 8 times the printing pitch. Thereafter, printing stage 2 is executed. Normally, as this a traverse from the left to the right, the active portion of the print head includes all nozzles. But as printing is to be limited to stroke (31) only, only the upper half of the nozzles is image-wise activated. As stroke (31) is completed now, printing is delayed till the required intervention is completed.
  • the printing process is recovered with the strokes left blank during finishing of printing process.
  • the print head is advanced from the right to the left with all nozzles inactive.
  • printing stage 1 is executed for the subsequent stroke using the complementary part of the print head, being the lower half of the nozzles. Thereafter printing can proceed according to the print mask till the complete image is printed.

Landscapes

  • Ink Jet (AREA)

Claims (9)

  1. Dispositif d'impression pour imprimer des images sur un élément récepteur d'image au cours d'une séquence d'étapes d'impression, le dispositif d'impression comprenant
    au moins une tête d'impression pour imprimer, lors de chaque étape d'impression, une partie d'une image sur une passe de l'élément récepteur d'image, la tête d'impression pouvant se déplacer selon un mouvement de va-et-vient sur l'élément récepteur d'image dans une direction de balayage principale et comportant une pluralité d'éléments de décharge pour imprimer, lors de chaque étape d'impression, une partie d'une image sur une passe de l'élément récepteur d'image, chaque étape d'impression correspondant à un déplacement transversal de la tête d'impression dans un état de fonctionnement dans la direction de balayage principale,
    des moyens de déplacement pour établir un déplacement relatif entre la tête d'impression et l'élément récepteur d'image sur une distance prédéterminée dans une direction de balayage secondaire après chaque étape d'impression, de manière que les passes imprimées ultérieurement se chevauchent au moins partiellement, et
    des moyens de génération d'un signal de retard,
    caractérisé en ce que le dispositif d'impression comprend en outre
    des moyens de commande pour commander, au cours d'un état de fonctionnement l'imprimante, en réponse audit signal de retard, la tête d'impression et les moyens de déplacement, de manière à poursuivre l'impression uniquement sur la passe en cours d'impression après réception du signal de retard, jusqu'à ce que toutes les étapes d'impression de la séquence soient achevées pour ladite passe.
  2. Dispositif d'impression selon la revendication 1, comprenant en outre un moyen de génération d'un signal de reprise de manière qu'en réponse audit signal de reprise, l'impression puisse reprendre sur une prochaine passe de l'élément récepteur d'image contiguë aux passes imprimées.
  3. Dispositif d'impression selon les revendications 1 et 2, dans lequel le signal de retard est un signal de demande de maintenance.
  4. Dispositif d'impression selon les revendications 1 et 2, dans lequel le signal de retard est généré par interaction de l'opérateur.
  5. Dispositif d'impression selon l'une quelconque des revendications précédentes, dans lequel les moyens de commande sélectionnent, pour chaque ledit déplacement transversal de la tête d'impression dans la direction de balayage principale, une partie active de la pluralité des éléments de décharge, chaque partie active des éléments de décharge étant sélectionnée en fonction de la distance prédéterminée, de manière que pour sensiblement chaque position dans la direction de balayage secondaire sur la partie de l'élément récepteur d'image où l'image doit être restituée, la direction de déplacement transversal de la tête d'impression soit la même pour chaque première exposition à une partie active de la tête d'impression en déplacement.
  6. Dispositif d'impression selon la revendication 5, dans lequel la partie active sélectionnée pour un déplacement transversal en avant est différente de la partie active sélectionnée pour un déplacement transversal en arrière.
  7. Dispositif d'impression selon les revendications 5 ou 6, dans lequel, lorsque l'on imprime des parties suivantes d'une image, on utilise une séquence répétitive d'étapes d'impression et d'étapes de déplacement correspondantes, chaque étape de déplacement étant définie par le déplacement relatif entre la tête d'impression et l'élément récepteur d'image sur une distance prédéterminée entre les étapes d'impression ultérieures respectives.
  8. Dispositif d'impression selon la revendication 7, dans lequel chacune des étapes de déplacement est égale à la même constante.
  9. Dispositif d'impression selon l'une quelconque des revendications précédentes, dans lequel ledit dispositif d'impression est une imprimante à jet d'encre.
EP05112994A 2005-01-04 2005-12-27 Imprimante Ceased EP1676705B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05112994A EP1676705B1 (fr) 2005-01-04 2005-12-27 Imprimante

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05100023 2005-01-04
EP05112994A EP1676705B1 (fr) 2005-01-04 2005-12-27 Imprimante

Publications (2)

Publication Number Publication Date
EP1676705A1 EP1676705A1 (fr) 2006-07-05
EP1676705B1 true EP1676705B1 (fr) 2007-10-03

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Application Number Title Priority Date Filing Date
EP05112994A Ceased EP1676705B1 (fr) 2005-01-04 2005-12-27 Imprimante

Country Status (1)

Country Link
EP (1) EP1676705B1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5949450A (en) * 1996-03-15 1999-09-07 Hewlett-Packard Company Print mode and system to alleviate wait-banding
JP4343481B2 (ja) * 2001-02-06 2009-10-14 キヤノン株式会社 インクジェット記録装置及びインクジェット記録方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP1676705A1 (fr) 2006-07-05

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