EP3222427B1 - Dispositif d'alimentation circulant en encre d'au moins une tête d'impression - Google Patents

Dispositif d'alimentation circulant en encre d'au moins une tête d'impression Download PDF

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Publication number
EP3222427B1
EP3222427B1 EP17157031.0A EP17157031A EP3222427B1 EP 3222427 B1 EP3222427 B1 EP 3222427B1 EP 17157031 A EP17157031 A EP 17157031A EP 3222427 B1 EP3222427 B1 EP 3222427B1
Authority
EP
European Patent Office
Prior art keywords
ink
chamber
housing
overflow
channel
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
EP17157031.0A
Other languages
German (de)
English (en)
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EP3222427A1 (fr
Inventor
Markus Möhringer
Alexander Matern
Silas Falter
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen 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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP3222427A1 publication Critical patent/EP3222427A1/fr
Application granted granted Critical
Publication of EP3222427B1 publication Critical patent/EP3222427B1/fr
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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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor

Definitions

  • the present invention relates to a device for circulating supply of at least one printhead with ink with the features of claim 1.
  • the invention is in the technical field of ink jet printing (inkjet) and the supply of ink to the print heads used in ink jet printing.
  • a conventional device for supplying a printhead with ink has at least one reservoir for the ink and supply lines and a pump for conveying the ink from the reservoir to the ink head.
  • a return line is also provided, through which unprinted ink is conveyed back from the printhead into the storage container.
  • PPSI-12000 is an ink supply system from the manufacturer “Prototype & Production Systems Incorporated", Madison, USA (see prototypesys.com), which has a more compact structure than the aforementioned device, but as a further one Components sensors needed.
  • the US 2009/0147047 A1 describes a device for ink supply in a screen printing machine. Two chambers for the printing ink and a pump are arranged inside a screen printing cylinder.
  • Draws a device for circulating supply of at least one printhead with ink, with a pump, a housing, a first chamber arranged in the housing with a first overflow for the ink and a second chamber arranged in the housing with a discharge for the ink leading to the pump is characterized in that a third chamber is arranged in the housing, which is separated from the second chamber by means of an inner wall of the housing and which is connected to the second chamber by means of a first channel arranged in the wall.
  • the device according to the invention advantageously makes it possible to save considerable installation space through the clever interaction of several chambers, and such a device can therefore also be used advantageously in compact inkjet printing machines. Furthermore, the device according to the invention does not require any sensors and is therefore inexpensive to manufacture. In addition, the device according to the invention is advantageously easy to clean and maintain. In addition, the device according to the invention advantageously enables the amount of circulating and in particular tempered ink to be kept low.
  • An advantageous and therefore preferred embodiment of the invention can be characterized in that the inner wall is designed as a weir with a second overflow for the ink.
  • An advantageous and therefore preferred embodiment of the invention can be characterized in that the first channel is arranged below, in particular perpendicularly below, the second overflow.
  • An advantageous and therefore preferred embodiment of the invention can be characterized in that the bottom of the third chamber is inclined with respect to the horizontal and the first channel opens into the third chamber at the lower end of the bottom.
  • An advantageous and therefore preferred embodiment of the invention can be characterized in that the first overflow is arranged above the weir, such that ink flowing down from the first overflow reaches the weir.
  • first overflow comprises a first slope inclined in a first direction with respect to the horizontal and that the second overflow comprises a second slope inclined in an opposite second direction with respect to the horizontal .
  • An advantageous and therefore preferred embodiment of the invention can be characterized in that the second slope opens into a third channel connecting the first chamber and the second chamber.
  • An advantageous and therefore preferred embodiment of the invention can be characterized in that the second slope is many times longer than the first slope, in particular more than twice, three or four times.
  • the first channel comprises a non-return device, in particular a non-return valve, which allows an ink flow from the third chamber to the second chamber, but not in the opposite direction.
  • An advantageous and therefore preferred embodiment of the invention can be characterized in that the device has a tempering device for tempering the ink and that the tempered ink flows through the first chamber and through the second chamber, but not through the third chamber.
  • the ink can preferably be heated to a temperature between 35 and 50 ° C, in particular to about 42 ° C.
  • An advantageous and therefore preferred embodiment of the invention can be characterized in that an upper edge of the inner wall is at the same height or higher than an upper edge of the first overflow.
  • An advantageous and therefore preferred embodiment of the invention can be characterized in that the pump is arranged on the outside of the housing.
  • the pump generates e.g. a volume flow in the range between 100 and 150 ml / min, preferably of about 125 ml / min.
  • An advantageous and therefore preferred embodiment of the invention can be characterized in that the pump is a pump which is controlled with respect to the delivery quantity of the ink but is not regulated. It can advantageously be based on expensive sensors, e.g. B. for measuring the respective level of an ink level, the ink pressures or the delivered ink volume can be dispensed with. By dispensing with such sensors, additional installation space can also be saved.
  • An advantageous and therefore preferred embodiment of the invention can be characterized in that the drain is designed as a second channel lying in an outer wall of the housing and that the drain leads to the pump.
  • An advantageous and therefore preferred embodiment of the invention can be characterized in that the bottom of the second chamber is inclined with respect to the horizontal and the second channel opens into the second chamber at the lower end of the bottom.
  • an advantageous and therefore preferred embodiment of the invention can be characterized in that the housing comprises an opening for filling in ink and that the opening is arranged above the third chamber and laterally offset from the second overflow.
  • An advantageous and therefore preferred embodiment of the invention can be characterized in that a horizontal control surface for controlling the fill level of the ink is arranged perpendicularly below the opening.
  • An advantageous and therefore preferred embodiment of the invention can be characterized in that an upper edge of the inner wall is higher than the control surface.
  • An advantageous and therefore preferred embodiment of the invention can be characterized in that the pump pumps ink through an ink line from the second chamber to an upper basin for the ink and that the ink level in the upper basin lies above nozzles of the printhead.
  • the upper basin can be adjusted vertically, or it can be positioned at different heights on the print head to adjust the ink pressure on the input side.
  • An advantageous and therefore preferred embodiment of the invention can be characterized in that the ink line can be tempered at least in sections.
  • An advantageous and therefore preferred embodiment of the invention can be characterized in that the first chamber forms a sub-basin for the ink and that the ink level in the sub-basin lies below the nozzles of the printhead.
  • An advantageous and therefore preferred embodiment of the invention can be characterized in that the housing comprises a further opening and that the further opening is connected via an ink line to a third overflow assigned to the upper basin.
  • the housing is designed as an at least two-part housing.
  • An advantageous and therefore preferred embodiment of the invention can be characterized in that a circulation pump for circulating the ink, in particular a pigmented ink, is arranged in the third chamber.
  • a device for circulating supply of ink to at least one print head 3 having nozzles 3a can be seen.
  • the device 1 comprises a housing 2, in which ink 4 is stored, and from which the ink is conveyed by means of a pump 14 through a line designed as a hose to a so-called upper basin 18.
  • the tube 17 can be surrounded at least in sections by a temperature control device which heats the ink conveyed through the tube to a temperature required for printing with the head 3.
  • the upper basin has an overflow 27, from which ink can be led back to the housing 2 through an ink line, which is also preferably designed as a hose.
  • An ink level 19 is defined in the upper basin by the overflow 27.
  • a line 22 leads from the lowest point of the upper basin to the print head, which prints a portion of the ink supplied to it.
  • non-printed ink is led via a line 23 designed as a hose to a lower basin 5 designed as a chamber provided in the housing 2.
  • the lower basin also has an overflow 5a, which defines an ink level 20 in the lower basin.
  • a line 24 designed as a channel leads into a chamber 6 arranged in the housing 2.
  • the bottom of the chamber 6 is in turn connected to the pump 14 via a line, so that overall there is a circulating ink supply system for the Print head 3 results.
  • the two ink levels 19 and 20 are set in such a way that the hydrostatic pressure prevailing on the print head 3 or on its nozzles 3a is that which is required for trouble-free printing and which prevents uncontrolled leakage of ink.
  • FIG. 2 now shows in detail the housing 2 of the device 1 and in particular a housing part 2a.
  • the housing can preferably be made of plastic.
  • a further housing part 2b belongs to this housing part 2a, which is not shown, however, so that a view into the housing part 2a is possible.
  • the housing part 2b can be designed as a cover for the housing part 2a or it can be designed as a mirror image of the housing part 2a.
  • the housing or the housing part 2a has in particular an outer wall 2c, in which a groove 2d is provided, which is provided for receiving a seal 2d.
  • connecting elements 2e are also provided in the outer wall 2c, with which the two housing parts can be connected, for example screwed, the seal 2d ensuring that no ink escapes from the housing in an uncontrolled manner.
  • the housing can in particular be L-shaped, one leg being horizontal and another and preferably smaller leg being oriented vertically.
  • a pump 14 is arranged on the outer wall 2c of the housing 2 and conveys ink 4 stored in the housing via the ink line 17 designed as a hose to the print head 3 or to its nozzles 3a.
  • Figure 2 also shows that with a view to Figure 1 described ink lines 23 and 25 through which ink 4 comes back to the housing 2.
  • the solution according to the invention takes up very little space and can therefore also be used advantageously in compact inkjet printing machines in which there is only little space available for an ink supply system.
  • the integrated chambers and channels are advantageously simple and closed Clean and, if necessary, maintain, especially if the housing 2 can be easily placed in two parts as shown.
  • the first and preferably smallest chamber 5 or the lower basin is connected to the ink line 23 via a bore or a channel 5c and in this way non-printed ink gets back into the housing and into the first chamber 5.
  • the first chamber also has a first overflow or an upper edge 5a and a first slope 5b, over which ink 4 flows and thus comes out of the chamber 5. At the same time, this defines an ink level 20 in the basin 5.
  • Ink 4 coming out of the lower basin 5 or overflowing the overflow 5a reaches an inner wall 9 of the housing 2, which has a second slope 9b and a weir between the third chamber 7 and the second chamber 6 or their inlet (third channel 12) forms.
  • the ink reaches the third channel 12 via the second slope 9b and from there into the second chamber 6.
  • This second chamber has a bottom 6a, at the lower end 6b of which a drain 6c designed as a second channel is formed.
  • the second channel 6c leads through the outer wall of the housing to the pump 14.
  • the slope 9b is not absolutely necessary, but is advantageous because it can effectively prevent foaming of the ink (namely by controlled flow down into the chamber 6).
  • An opening 15 is provided in the outer wall 2c for filling the housing 2 with ink 4. This opening leads to the third and preferably largest chamber 7, so that the filled ink first reaches this chamber 7.
  • the ink fill level in the chamber 7 can be observed via a control surface 16: as soon as the ink level exceeds the control surface 16 when filling ink, sufficient ink is filled into the housing 2.
  • the third chamber 7 has a bottom 7a which is connected to the second chamber 6 at its lower end 7b via a first channel 8.
  • a check valve 8a can be provided in the channel 8, which ensures that ink only flows through the channel in one direction. In particular, ink is prevented from the second chamber 6 to third chamber 7 flows through channel 8.
  • the reason for this is as follows: since the ink supplied to the print head 3 is brought to a necessary operating temperature by means of the temperature control device 13, temperature-controlled, ie in particular heated, ink circulates through the chambers 5 and 6. In order to keep the amount of the ink to be tempered low and also only to heat such ink that is conveyed in the circulating system, the third chamber 7 is removed from the circulating system.
  • the quantity of ink stored in the third chamber 7 is therefore preferably not tempered, which offers the advantage that the quantity of ink stored therein can be kept cooler than the quantity of ink circulated in the circulating system, which in turn places little stress on the ink itself.
  • the inner wall 9 has at its upper end an upper edge 9a or a second overflow. If necessary, ink can also get back into the chamber 7 from the circulating system and in particular from the two chambers 5 and 6 via this overflow. As a rule, however, the ink level will be lower than the upper edge 9a.
  • the ink line 25 is connected to a bore 5e in the outer wall 2c of the housing 2, and ink overflowing from the upper basin 18 passes from the upper basin 18 back into the housing 2 and preferably there into the chamber 6.
  • the arrows 10 and 11 are in Figure 2 indicated two directions, against which the inclinations of the bevels arranged in the housing or the respective bottom of the chambers are defined.
  • the lines 17 emanating from the respective pumps 14 can then advantageously lead away laterally, ie along the arrangement of a plurality of housings, and preferably in the space (of an imaginary rectangle) free of the L-shaped housing parts.

Landscapes

  • Ink Jet (AREA)

Claims (24)

  1. Dispositif pour l'alimentation en circulation d'au moins une tête d'impression en encre, avec une pompe (14), un boîtier (2), une première chambre (5) agencée dans le boîtier avec un premier trop-plein (5a) pour l'encre (4) et une deuxième chambre (6) agencée dans le boîtier avec un écoulement (6c) allant à la pompe pour l'encre,
    caractérisé en ce
    qu'une troisième chambre (7) est agencée dans le boîtier, séparée au moyen d'une paroi intérieure (8) du boîtier de la deuxième chambre et reliée à la deuxième chambre par un premier canal (8) agencé dans la paroi.
  2. Dispositif selon la revendication 1,
    caractérisé en ce
    que la paroi intérieure (9) est conçue comme un déversoir (9b) avec un deuxième trop-plein (9a) pour l'encre (4).
  3. Dispositif selon la revendication 2,
    caractérisé en ce
    que le premier canal (8) est agencé en dessous, et notamment verticalement en dessous du deuxième trop-plein (9a).
  4. Dispositif selon l'une des revendications 2 à 3,
    caractérisé en ce
    que le fond (7 a) de la troisième chambre (7) est incliné par rapport à l'horizontale et que le premier canal (8) aboutit dans la troisième chambre à l'extrémité (7b) située plus bas du fond.
  5. Dispositif selon l'une des revendications 2 à 4,
    caractérisé en ce
    que le premier trop-plein (5a) est agencé au-dessus du déversoir (9b), de sorte que l'encre s'écoulant vers le bas parvienne du premier trop-plein au déversoir.
  6. Dispositif selon l'une des revendications 2 à 5,
    caractérisé en ce
    que le premier trop-plein (5a) comprend un premier plan oblique (5b) incliné par rapport à l'horizontale dans une première direction (10) et que le deuxième trop-plein (9a) comprend un deuxième plan oblique (9b) incliné par rapport à l'horizontale dans une deuxième direction (11) opposée.
  7. Dispositif selon la revendication 6,
    caractérisé en ce
    que le deuxième plan oblique (9b) aboutit dans un troisième canal (12) reliant la première chambre (5) et la deuxième chambre (6).
  8. Dispositif selon l'une des revendications 6 à 7,
    caractérisé en ce
    que la longueur du deuxième plan oblique (9b) est un multiple de celle du premier plan oblique (5b), le deuxième plan oblique étant notamment plus de deux fois, trois fois ou quatre fois plus long.
  9. Dispositif selon l'une des revendications 2 à 8,
    caractérisé en ce
    que le premier canal (8) est un dispositif anti-retour (8a), comprenant notamment un clapet anti-retour (8a), autorisant un flux de l'encre de la troisième chambre (7) à la deuxième chambre (6), mais toutefois pas dans le sens inverse.
  10. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce
    que le dispositif comprend un dispositif de régulation de température (13) pour la régulation de température de l'encre (4) et que l'encre tempérée traverse la première chambre (5) et la deuxième chambre (6), mais toutefois pas la troisième chambre (7).
  11. Dispositif selon la revendication 10,
    caractérisé en ce
    qu'un rebord supérieur (9a) de la paroi intérieure (9) se trouve à la même hauteur ou plus haut que le rebord supérieur (5 a) du premier trop-plein (5 a).
  12. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce
    que la pompe (14) est montée à l'extérieur du boîtier (2).
  13. Dispositif selon la revendication 12,
    caractérisé en ce
    que la pompe (14) est, en termes de débit de refoulement de l'encre (4) une pompe pilotée, mais non régulée.
  14. Dispositif selon l'une des revendications 12 à 13,
    caractérisé en ce
    que l'écoulement (6c) est configuré comme deuxième canal (6c) situé dans une paroi extérieure (2c) du boîtier (2), et que l'écoulement mène à la pompe (14).
  15. Dispositif selon l'une des revendications 12 à 14,
    caractérisé en ce
    que le fond (6a) de la deuxième chambre (6) est incliné par rapport à l'horizontale et que le deuxième canal (6c) à l'extrémité plus basse (6b) du fond aboutit à la deuxième chambre.
  16. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce
    que le boîtier (2) comprend une ouverture (15) pour le remplissage de l'encre (4) et que l'ouverture est disposée au-dessus de la troisième chambre (7) et décalée latéralement par rapport au deuxième trop-plein (9a).
  17. Dispositif selon la revendication 16,
    caractérisé en ce
    qu'une surface horizontale de contrôle (16) pour le contrôle de la hauteur de remplissage de l'encre (4) est agencée verticalement en dessous de l'ouverture (15).
  18. Dispositif selon la revendication 17,
    caractérisé en ce
    qu'un rebord supérieur (9a) de la paroi intérieure (9) se situe plus haut que la surface de contrôle (16).
  19. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce
    que la pompe (14) pompe de l'encre (4) par une conduite d'encre (17) de la deuxième chambre (6) vers une cuvette supérieure (18) pour l'encre (4) et que le niveau de l'encre (19) dans la cuvette supérieure se situe au-dessus de buses (3a) de la tête d'impression (3).
  20. Dispositif selon la revendication 19,
    caractérisé en ce
    que la conduite d'encre (17) permet au moins une régulation de la température par tronçons.
  21. Dispositif selon l'une des revendications 19 à 20,
    caractérisé en ce
    que la première chambre (5) forme une cuvette inférieure (5) pour l'encre (4) et que le niveau d'encre (20) dans la cuvette inférieure se situe en dessous des buses (3a) de la tête d'impression (3).
  22. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce
    que le boîtier (2) comprend une autre ouverture (26) et que l'autre ouverture est reliée via une conduite d'encre (25) avec un troisième trop-plein (27) associé à la cuvette supérieure (18).
  23. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce
    que le boîtier (2) est configuré comme un boîtier (2a, 2b) au moins en deux parties.
  24. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce
    qu'une pompe de circulation (28) pour la circulation de l'encre (4), notamment d'une encre pigmentée, est agencée dans la troisième chambre (7).
EP17157031.0A 2016-03-22 2017-02-21 Dispositif d'alimentation circulant en encre d'au moins une tête d'impression Active EP3222427B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016204693.4A DE102016204693A1 (de) 2016-03-22 2016-03-22 Vorrichtung zur zirkulierenden Versorgung wenigstens eines Druckkopfs mit Tinte

Publications (2)

Publication Number Publication Date
EP3222427A1 EP3222427A1 (fr) 2017-09-27
EP3222427B1 true EP3222427B1 (fr) 2020-06-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP17157031.0A Active EP3222427B1 (fr) 2016-03-22 2017-02-21 Dispositif d'alimentation circulant en encre d'au moins une tête d'impression

Country Status (3)

Country Link
EP (1) EP3222427B1 (fr)
CN (1) CN107215101B (fr)
DE (1) DE102016204693A1 (fr)

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Publication number Priority date Publication date Assignee Title
US4848602A (en) * 1985-12-28 1989-07-18 Canon Kabushiki Kaisha Container with baffled outlet
CN1727189A (zh) * 2001-05-17 2006-02-01 精工爱普生株式会社 喷墨记录设备的墨盒
CN100584621C (zh) * 2002-12-10 2010-01-27 精工爱普生株式会社 液体盒
CN2759782Y (zh) * 2005-01-18 2006-02-22 珠海天威飞马打印耗材有限公司 喷墨打印机用墨盒
JP2009137110A (ja) * 2007-12-05 2009-06-25 Riso Kagaku Corp 印刷装置
JP5486191B2 (ja) * 2009-01-09 2014-05-07 理想科学工業株式会社 インクジェットプリンタ
US8360566B2 (en) 2009-04-09 2013-01-29 Plastipak Packaging, Inc. Method for printing
US8231212B2 (en) * 2009-04-09 2012-07-31 Plastipak Packaging, Inc. Ink delivery system

Non-Patent Citations (1)

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Title
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Also Published As

Publication number Publication date
DE102016204693A1 (de) 2017-09-28
CN107215101B (zh) 2020-01-07
EP3222427A1 (fr) 2017-09-27
CN107215101A (zh) 2017-09-29

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