EP2148782B1 - Dispositif d'alimentation en encre pour une imprimante à jet d'encre - Google Patents

Dispositif d'alimentation en encre pour une imprimante à jet d'encre Download PDF

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Publication number
EP2148782B1
EP2148782B1 EP08758474A EP08758474A EP2148782B1 EP 2148782 B1 EP2148782 B1 EP 2148782B1 EP 08758474 A EP08758474 A EP 08758474A EP 08758474 A EP08758474 A EP 08758474A EP 2148782 B1 EP2148782 B1 EP 2148782B1
Authority
EP
European Patent Office
Prior art keywords
supply system
ink supply
print head
intermediate tank
ink
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.)
Active
Application number
EP08758474A
Other languages
German (de)
English (en)
Other versions
EP2148782A1 (fr
Inventor
Georg Grossrubatscher
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.)
Durst Phototechnik AG
Original Assignee
Durst Phototechnik AG
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 Durst Phototechnik AG filed Critical Durst Phototechnik AG
Priority to PL08758474T priority Critical patent/PL2148782T3/pl
Publication of EP2148782A1 publication Critical patent/EP2148782A1/fr
Application granted granted Critical
Publication of EP2148782B1 publication Critical patent/EP2148782B1/fr
Active 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
    • B41J2/135—Nozzles
    • B41J2/145—Arrangement thereof
    • B41J2/155—Arrangement thereof for line printing
    • 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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • 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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/21—Line printing

Definitions

  • the invention relates to an ink supply system for an ink jet printer, according to the features of the preamble of claim 1.
  • Ink jet printers are already known in which printhead assemblies composed of multiple printheads are used. These printheads are lined up to span a full print area width that is a multiple of the print area width of a single printhead. Such print head arrangements are arranged stationary relative to a transport device on which the parts to be printed are transported during the printing process. Such an inkjet printer is for example in the document WO 2006/084614 described.
  • High power inkjet printers typically use printheads with a large number of nozzles. Such printheads with, for example, 128 nozzles per print head must be supplied with ink for trouble-free operation, the pressure of which must be in a very narrow tolerance range.
  • Ink jet printer as used in the WO 2006/084614 or US 2007/0070106 described and as so-called large format printer with print area widths up to several meters, have the advantage of a very high throughput through the use of the described stationary printhead assembly.
  • the narrow tolerance range for the ink pressure at the individual printheads requires a very high technical and therefore costly effort to ensure each individually required ink supply can.
  • the object of the present invention is therefore to produce an ink supply system for an inkjet printer with a printhead assembly composed of individual printheads, which can be constructed inexpensively with relatively few simple technical components.
  • the object of the invention is achieved by an ink supply system according to the features of claim 1 solved.
  • the advantage here is that the supply of the same number of printheads by a common intermediate tank with a significant reduction in space requirements for the components of the ink supply system also achieves the advantage that by the reduction of the fluid pressure of the ink regulating components, the susceptibility of an ink jet printer equipped so much can be reduced.
  • the inlet channels as provided in claim 11, to form by tubing, have the advantage that thus a very flexible adaptation of the flow lengths of the inlet channels can be achieved.
  • a return channel by simply exchanging a hose of different lengths.
  • the Fig. 1 shows an ink jet printer 1 with an ink supply system 2.
  • the ink supply system 2 is shown only for a color or an ink.
  • ink supply systems 2 in the corresponding number of colors are to be provided.
  • the inkjet printer has a horizontally arranged transport device 3 for moving a printing part 4 lying on top of it in a feed direction 5 (as shown perpendicularly out of the plane of the drawing). Above the transport device 3 is a printhead assembly 6 with printheads 7, through which the printing member 4 moved beneath is printed with ink.
  • the transport device 3 is formed for example by a circulating conveyor belt, which is guided or driven via at least two deflection rollers.
  • the moving in the feed direction 5 upper portion of the conveyor belt is supported by one or more guide plates on its underside, so that a correspondingly uniform horizontal movement of the printing member 4 in the feed direction 5 is achieved.
  • the printhead assembly 6 has a plurality of printheads 7 for each color, so that the entire width of the print medium or the printing member 4 can be printed at once without the printhead assembly 6 having to move in the lateral direction with respect to the feed direction. That the printhead assembly 6 is stationary in the lateral direction and stationary with respect to the transport means 3 during printing.
  • Each of the print heads 7 has a nozzle row 8 formed by a plurality of juxtaposed and usually linearly aligned nozzles.
  • the nozzle row 8 contains, for example, 128 juxtaposed nozzles (for reasons of clarity in FIG Fig. 1 not shown).
  • a single print head 7 or a nozzle row 8 accordingly has a printing area width 9 measured perpendicular to the feed direction 5.
  • the print heads 7 and their nozzle rows 8 are lined up close to each other, so that a total print area width 10 of the print head assembly 6 results.
  • the print heads 7 must be arranged alternately offset with respect to the feed direction 5, which is shown in the illustration Fig. 1 additionally indicated by a slight vertical displacement. Instead of being perpendicular, the print heads 7 could also be arranged obliquely with respect to the feed direction 5, with a smaller printing area width 9 being able to be achieved conversely but a higher resolution or pixel density.
  • the ink supply system 2 first comprises a main tank 11 from which an intermediate tank 12 is supplied with ink.
  • an inlet channel 13 is provided with a pump 14.
  • To supply the printheads 7 from the intermediate tank 12 with ink this is connected to the printhead assembly 6 and the printheads 7 with a line network 15.
  • multiple printheads are each connected by a conduit to the common sub-tank 12. It is provided that all the intermediate tank 12 with the printheads 7 connecting line sections of the pipe network 15 have a directed from the intermediate tank 12 to the printheads 7 down slope. This has the advantage that air bubbles, which can arise from different causes in the pumped ink, can always escape upward and so a malfunction of a print head 7 is avoided.
  • the intermediate tank 12 is further connected to a vacuum pump 16 in such a way that the air located above a liquid level 17 of the ink can be set under negative pressure relative to the ambient air pressure. This is necessary to prevent leakage of the filled inks through the nozzle openings of the print heads 7 due to the dead weight of the ink.
  • a level sensor 18 with which the level of the liquid level 17 and the level of the intermediate tank 12 can be measured with ink arranged. With the help of the level sensor 18, the liquid level 17 can be monitored in the intermediate tank 12 in a controller 19 and always sufficient ink from the main tank 11 are refilled by appropriately driving the pump 14, that the liquid level 17 is kept constant.
  • the level of the liquid level 17 constant is important in that the hydrostatic pressure of the ink corresponding to the height difference between the liquid level 17 and the nozzle openings in the printheads 7 is responsible for the pressure ratios of the ink liquid in the printheads 7 and thus for trouble-free operation
  • the sum of the air pressure prevailing above the liquid level 17 in the intermediate tank 12 and the hydrostatic pressure must the ink liquid just equal to the atmospheric pressure of the environment.
  • the negative pressure or the pressure prevailing over the liquid level 17 air pressure must be set so that on the one hand it is not too low, thus preventing the ink from spilling out of the nozzles and on the other hand is not too high, otherwise ink in the Printhead interior is sucked and thus air from the outside can enter through the nozzle openings, which has a nozzle failure result when the piezochamber is filled with air.
  • Further effects, which may also have an influence on the printing situation in the print heads 7, are increasing pressure losses due to an increasing blockage of the possibly used degassing or filter units (in FIG Fig.
  • a manifold 20 is further provided in the intermediate tank 12 with the printheads 7 of the printhead assembly 6 connecting line network 15.
  • the distributor 20 is preferably formed by a distributor tube of constant tube cross-section and of straight shape.
  • outlet openings 21 are arranged for supply channels 22 for the print heads 7, wherein distances of successive outlet openings 21 are equidistant with respect to a longitudinal extent of the manifold.
  • a distance between two successive outlet openings 21 is preferably equal to the pressure area width 9, ie a distance between two successive print heads 7.
  • the distributor tube 20 is substantially straight and parallel to the extension of the Printhead assembly 6 corresponding to the entire printing area width 10 is arranged.
  • printheads 7 can be assembled into a structural unit, ie a so-called printhead module.
  • the above description with regard to the print area widths 9 of the print heads 7 and the structure of the print head arrangement 6 can thus be transferred analogously to printhead modules formed from a plurality of print heads 7.
  • an inlet channel 22 is provided for supplying such a printhead module formed of a plurality of printheads 7 with ink. Accordingly, the distance between two successive outlet openings is then equal to the distance or the print area width of two successive printhead modules.
  • the line connecting the intermediate tank 12 with a print head 7 or a print head module thus comprises a first line section 23 common to a plurality of print heads 7 or a plurality of print head modules and a respective own feed channel 22 to the print head 7 or to the print head module.
  • the leading to the printheads 7 inlet channels 22 are preferably formed by flexible tubes.
  • a length 24 of each successive inlet channels 22 is dimensioned smaller, the greater is a relative to the longitudinal extent of the manifold 20 measured distance of the respective outlet opening 21 of the intermediate tank. In this case, a highest point 25 of the manifold 20 is connected to the intermediate tank 12.
  • the lengths 24 of the inlet channels 22 are so dimensioned that for the operating state of the maximum ink ejection through the nozzles of the print heads 7, the sum of the pressure losses caused by the flow resistances in the respective inlet channel 22 and the corresponding line section 23, for all on the manifold 20 connected inlet channels 22 are as equal as possible.
  • this is inclined relative to a horizontal plane by an angle 26.
  • This angle 26 is variable, in which the distributor tube 20 is mounted on an adjusting device 27, so that the inclination can be adjusted.
  • the adjusting device 27 may alternatively also by a different than in the Fig. 1 be shown holder realized.
  • the two ends of the manifold 20 - provided for example with oblong holes - vertically adjustable to attach to a frame part of the ink jet printer 1 by screwing. This has the advantage of even more stable attachment.
  • the angle 26 of the inclination of the manifold 20 is preferably dimensioned so that the inlet channels 22 are in a largely extended position.

Landscapes

  • Ink Jet (AREA)

Abstract

La présente invention concerne un dispositif d'alimentation en encre (2) pour une imprimante à jet d'encre (1) équipé d'un ensemble tête d'impression (6) pour au moins une couleur, l'ensemble tête d'impression (6) comprenant plusieurs têtes d'impression (7) dotées respectivement de plusieurs buses et les têtes d'impression (7) étant disposées les unes à côté des autres pour former une largeur de zone d'impression totale (10) qui correspond à un multiple d'une largeur de zone d'impression (9) d'une tête d'impression individuelle (7). Chaque tête d'impression (7) est reliée, par le biais d'une conduite, à un réservoir intermédiaire (12) pour l'encre de la couleur respective, plusieurs têtes d'impression (7) étant reliées à un réservoir intermédiaire commun (12).

Claims (13)

  1. Système d'alimentation en encre (2) pour une imprimante à jet d'encre (1) avec un agencement de têtes d'impression (6) pour au moins une encre, où l'agencement de têtes d'impression (6) comprend plusieurs têtes d'impression (7) avec à chaque fois plusieurs buses, et où les têtes d'impression (7) sont agencées les unes à côté des autres en une largeur de zone d'impression totale (10) selon un multiple de la largeur de zone d'impression (9) d'une seule tête d'impression (7), et où chacune des têtes d'impression (7) est reliée par une conduite à une cuve intermédiaire (12) pour l'encre de la couleur respective, et où plusieurs têtes d'impression (7) sont reliées à une cuve intermédiaire commune (12), caractérisé en ce que la conduite forme un distributeur (20) qui est formé par un tube de distributeur, et où le tube de distributeur (20) est incliné par rapport à un plan horizontal selon un angle (26).
  2. Système d'alimentation en encre (2) selon la revendication 1, caractérisé en ce que le distributeur (20) forme une première section de conduite (23) commune à plusieurs têtes d'impression (7) et comprend à chaque fois un canal d'amenée propre (22) à la tête d'impression (7).
  3. Système d'alimentation en encre (2) selon la revendication 1, caractérisé en ce que plusieurs têtes d'impression (7) forment un module de têtes d'impression, où l'agencement de têtes d'impression (6) comprend plusieurs modules de têtes d'impression, et en ce que la conduite reliant la cuve intermédiaire (12) au module de têtes d'impression forme le distributeur (20), qui forme en outre une première section de conduite (23) commune à plusieurs modules de têtes d'impression et comprend à chaque fois un canal d'amenée propre (22) au module de têtes d'impression.
  4. Système d'alimentation en encre (2) selon la revendication 1 à 3, caractérisé en ce qu'un point situé le plus haut (25) du tube de distributeur (20) est relié à la cuve intermédiaire (12).
  5. Système d'alimentation en encre (2) selon l'une des revendications précédentes, caractérisé en ce que toutes les sections de conduite (22, 23) reliant la cuve intermédiaire (12) à la tête d'impression (7) présentent une inclinaison dirigée de la cuve intermédiaire (12) à la tête d'impression (7).
  6. Système d'alimentation en encre (2) selon l'une des revendications 1 à 5, caractérisé en ce que des ouvertures de sortie (21) du tube de distributeur (20) aux canaux d'amenée (22) pour les têtes d'impression (7) sont disposées d'une manière équidistante relativement à une extension longitudinale du tube de distributeur (20).
  7. Système d'alimentation en encre (2) selon la revendication 6, caractérisé en ce qu'un écart entre deux ouvertures de sortie successives (21) est égal à un écart entre deux têtes d'impression successives (7) ou égal à un écart entre deux modules de têtes d'impression successifs.
  8. Système d'alimentation en encre (2) selon la revendication 6 ou 7, caractérisé en ce qu'une longueur (24) de canaux d'amenée successifs (22) est plus petite au fur et à mesure qu'un écart mesuré relativement à l'extension longitudinale du tube de distributeur (20) de l'ouverture de sortie respective (21) de la cuve intermédiaire (12) est plus grand.
  9. Système d'alimentation en encre (2) selon l'une des revendications 2 à 8, caractérisé en ce que les canaux d'amenée (22) sont formés par des tuyaux.
  10. Système d'alimentation en encre (2) selon l'une des revendications 1 à 9, caractérisé en ce que le tube de distributeur (20) est logé à une installation d'ajustement (27), où au moyen de l'installation d'ajustement, l'angle (26) de l'inclinaison par rapport au plan horizontal est modifiable.
  11. Système d'alimentation en encre (2) selon l'une des revendications précédentes, caractérisé en ce que la cuve intermédiaire (12) est reliée à une pompe à vide (16) pour produire une dépression par rapport à la pression d'air extérieure.
  12. Système d'alimentation en encre (2) selon l'une des revendications précédentes, caractérisé en ce que la cuve intermédiaire (12) est reliée à une cuve principale (11) pour la ré-alimentation en encre.
  13. Système d'alimentation en encre (2) selon l'une des revendications précédentes, caractérisé en ce qu'est disposé dans la cuve intermédiaire (12) un capteur du niveau de remplissage (18) pour la mesure du niveau de remplissage de la cuve intermédiaire (12) en encre.
EP08758474A 2007-05-14 2008-05-13 Dispositif d'alimentation en encre pour une imprimante à jet d'encre Active EP2148782B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08758474T PL2148782T3 (pl) 2007-05-14 2008-05-13 Układ zasilania atramentem do drukarki atramentowej

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0074607A AT505464B1 (de) 2007-05-14 2007-05-14 Tintenversorgungssystem für einen tintenstrahldrucker
PCT/EP2008/003810 WO2008138586A1 (fr) 2007-05-14 2008-05-13 Dispositif d'alimentation en encre pour une imprimante à jet d'encre

Publications (2)

Publication Number Publication Date
EP2148782A1 EP2148782A1 (fr) 2010-02-03
EP2148782B1 true EP2148782B1 (fr) 2011-10-26

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EP08758474A Active EP2148782B1 (fr) 2007-05-14 2008-05-13 Dispositif d'alimentation en encre pour une imprimante à jet d'encre

Country Status (6)

Country Link
US (1) US8322833B2 (fr)
EP (1) EP2148782B1 (fr)
AT (2) AT505464B1 (fr)
ES (1) ES2375888T3 (fr)
PL (1) PL2148782T3 (fr)
WO (1) WO2008138586A1 (fr)

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USD891646S1 (en) 2018-06-28 2020-07-28 Vista Manufacturing Inc Light assembly

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Also Published As

Publication number Publication date
EP2148782A1 (fr) 2010-02-03
ES2375888T3 (es) 2012-03-07
US8322833B2 (en) 2012-12-04
AT505464B1 (de) 2009-06-15
ATE530345T1 (de) 2011-11-15
WO2008138586A1 (fr) 2008-11-20
US20100302324A1 (en) 2010-12-02
AT505464A1 (de) 2009-01-15
PL2148782T3 (pl) 2012-03-30

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