EP2834073B1 - Supply system for inkjet printers - Google Patents
Supply system for inkjet printers Download PDFInfo
- Publication number
- EP2834073B1 EP2834073B1 EP13720035.8A EP13720035A EP2834073B1 EP 2834073 B1 EP2834073 B1 EP 2834073B1 EP 13720035 A EP13720035 A EP 13720035A EP 2834073 B1 EP2834073 B1 EP 2834073B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ink
- reservoir
- supply
- pressure
- supply system
- 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
Links
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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
- B41J2/18—Ink recirculation systems
-
- 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 subject matter of the present invention is a supply system for a printer that uses a jet of ink, commonly known as an inkjet printer.
- the supply system finds application in supplying inkjet printers that use inks with high solids content, the solids essentially being constituted by pigments reduced to fine particles.
- the document US 2010/0039460 illustrates an example of the prior art concerning an ink supply system for an inkjet printer.
- the system comprises printing units, each one of which being made up of several print heads individually provided with one or more nozzles.
- Each print head is of the so-called recirculating type and supplied by its own channel from an ink reservoir. By means of another channel, the same print head is connected to a collection reservoir in which the excess ink is collected.
- the principal aim of the present invention is to provide an adequate solution to the problem consisting of possible sedimentation, thereby overcoming the negative consequences described above.
- An additional aim of the invention is to provide a simple means of control of the working conditions of the print heads that ensures a high level of constancy of operation.
- An additional aim of the invention is that of rendering the operation of the (single) heads independent of the recirculation system so as to maximize the performance of both.
- An advantage of the invention lies in the fact that it allows for a rapid stabilizing of the pressures throughout the circuit supplying the heads whenever, owing to the inevitable variations caused by corresponding variations in the flows required by some of the same heads, pressure imbalances occur, negatively affecting the regular operation of the printer.
- Another advantage can definitely be found in the fact that the supply system permits regular operation even in the event of a temporary shutdown of some parts of the system, such as the pumps that produce circulation of the ink for example.
- the print head 1 indicates a single print head, which is provided with a plurality of nozzles 11, which are assigned the function of producing, on command, the release of tiny droplets of ink.
- the print head 1 is an ink recirculation print head of the type in which in other words the ink flows continuously "in front of” the nozzles 11 of the print head and ink ejection is carried out, upon specific command, by the preselected nozzle independently of the others.
- the print head 1 is part of a printing unit 2 that proves to be made up of one or more print heads 1 with ink recirculation and that forms a "bar of colour” or a printing unit 2 of an extension suited to the size to be printed.
- the print heads that make up the "bar of colour” or printing unit 2 work with the same ink, that is, with the same colour.
- the print heads 1 forming the said "bar of colour” are supplied by an ink supply system, which comprises: a line for supply-distribution of the ink, indicated in its entirety by the number 3, and a line for recirculation 4 of the ink.
- the supply-distribution line 3 originates from a reservoir 5, has a plurality of short connecting branches 30 for supplying the print heads 1 and empties into the same reservoir 5.
- the line for recirculation 4 of the ink is made up of a plurality of short channels 40 originating from the print heads 1 - in the case represented, a short channel 40 originates from each print head - and converging into a collection manifold 41, which empties into the reservoir 5.
- the ink supply-distribution line 3 comprises a distribution tube 31, from which the short connecting branches 30 directly branch off for the supply of the print heads 1 in a number at least equal to the number of print heads 1 to be supplied.
- At least the distribution tube 31 is shaped and proportioned so as to reduce to a minimum head loss of the liquid circulating therein.
- the distribution tube 31 has a larger diameter than that of the tubing making up the remaining part of the entire supply-distribution line 3.
- the distribution tube 31 empties directly into the reservoir 5.
- This first means serves the function of producing the circulation of the ink in the supply-distribution line 3 and comprises a circulation pump 32 located upstream of the distribution tube 31.
- an equipment located upstream of the distribution tube 31, and downstream of the circulation pump 32, there is provided an equipment, indicated in its entirety by the number 33, containing a filtering device and a device for deaeration of the ink.
- the supply-distribution line 3 is subject to a set of control means, the function of which is that of controlling the pressure in the said supply-distribution line and particularly in the distribution tube 31.
- These means comprise a first pressure sensor 34 suitable for measuring the pressure existing in the distribution tube 31 of the supply-distribution line 3, for comparing said pressure value with a preset pressure value and, based on the difference found, for commanding the activation of an apparatus 50 suitable for maintaining the pressure inside the reservoir 5 in keeping with the said preset value.
- the apparatus 50 keeps the reservoir 5 under vacuum conditions, creating therein the said preset vacuum value, which is determined and regulated to enable the proper timed operation of the print head nozzles, thus realizing the ejection of ink only on command and in the amount foreseen, without the occurrence of conditions giving rise to the possibility for example of undesired spontaneous ejection.
- the ink level pre-established for proper functioning of the printing unit is automatically maintained in the reservoir 5 by means of a simple device that comprises an ink level sensor 51, which automatically activates a refiller pump 52.
- the latter provides for replenishment of the liquid until the pre-established level is reached.
- the ink recirculation line 4 is made up of a plurality of short channels 40 originating from the print heads 1 and converging into a collection manifold 41, which empties by converging into the reservoir 5.
- a second means suitable for producing the circulation of the ink in the collection manifold 41 comprises a suction-pumping device, which is preferably constituted by a pump 43 that is commanded to suction the ink from the collection manifold 41 and re-introduce it into the reservoir 5.
- an apparatus made up of a reservoir, in which a pre-established vacuum degree is maintained through a vacuum pump or a Venturi for the purpose of generating suction and thus the circulation of the ink in the recirculation line 4.
- a specific control means is provided for controlling the pressure in the recirculation line 4 and particularly in the collection manifold 41, thus controlling the system in this manner.
- a pressure sensor 42 is provided for measuring the pressure existing in the recirculation line 4, for comparing of said pressure value with a preset pressure value and, based on the difference found, for commanding the activation of a suction-pumping device consisting of a pump 43 suitable for maintaining the pressure in keeping with the said preset value.
- the apparatus 50 controls the pressures inside the heads 1 by controlling the pressure in the reservoir 5.
- a sort of safety circuit which for example makes it possible to prevent undesired discharge of ink from the heads 1, when supply voltage to the electrical equipments for activation of the system is not present.
- the system may consist of a circuit comprising a valve 46, a Venturi tube 47 and a pressure gauge or pressure indicator 48.
- a compressed air circuit 49 passes through the pressure gauge 48, the valve 46 and the Venturi tube 47, thereby realizing in the Venturi tube a vacuum that is transmitted by means of a channel 55 to the reservoir 5.
- the electrically commanded valve 46 is of a type that is normally open when electrical voltage is present. Therefore, when it is energized, it closes, preventing the passage of air.
- the electrical command of the valve is directly connected to the voltage generator of the machine.
- the apparatus 50 stops working, the valve goes out of control, opening instantly and permitting the compressed air to reach the Venturi tube 47.
- the vacuum created by the Venturi tube 47 is transmitted to the reservoir 5 by means of the channel 55.
- the pressure gauge or pressure indicator 48 is regulated in such a manner as to have the necessary flow of air pass into the Venturi tube for the purpose of generating the proper vacuum level inside the reservoir 5, which makes it possible to maintain the ink in equilibrium inside the heads 1.
- the special structure of the supply system that is the subject matter of the invention described creates an operating condition of the printing unit 2, which substantially renders the operation of the individual head 1 independent of that of the others making up the printing unit 2, thereby permitting a considerable reduction of the possibility of sedimentation of solid particles.
- This is afforded by the possibility of keeping considerable amounts of ink in constant movement, in a manner substantially independent of the absorption of the individual heads. In fact, the constant movement and the considerable flows counteract the risk of sedimentation very effectively.
- the flow of ink drawn by the individual heads is independent of the "external" flow that takes place in the distribution tube 31, which closes the supply-distribution line 3 in a loop on the reservoir 5.
- the flow is drawn by the individual head 1 through the short connecting branches 30, thus being fractionated in two parts: the first, which is ejected on command from the nozzles so as to realize the printing, or decoration in the case of ceramic tiles 10, the second, which is recirculated through the short channel 40 and directed into the collection manifold 41, which provides for channelling it into the-reservoir 5.
- control system implemented as a whole by the described control means, which operates by monitoring the pressure in the distribution tube 31 and in the collection manifold 41, makes it possible to carry out the adjustments needed so as to maintain the operation of the system constantly aligned with the required parameters in the presence of variability of the situations involving the demand for ink on the part of the various print heads.
- the flow rate of the ink realized by the system can be set as desired, and this is an advantage of the system.
- it can also be set at a value higher than the maximum supply value and simultaneously for all the heads 1 in the printing unit 2. This makes it possible to have ink flow into the heads, always under the best conditions, for example being highly deaerated by the system 33.
- the present solution also makes it possible to exclude the circulation pump 32 or the equipment 33 temporarily for short periods of time, without impairing the regular operation of the same heads.
- the pump 43 is of a type capable of realizing, on command, reversal of the flow of the fluid pumped, for the purpose of carrying out internal recirculation in the heads 1 in a direction opposite the usual direction for carrying out internal cleaning.
- the reversal of the flow is important for removing contaminating particles that may be present inside the individual head and that can obstruct the head, or also simply for washing out the heads.
- the reversal of the flow is realized by means of the reversal of the motion of the pump 43 that draws the ink from the reservoir 5 and sends it to the heads.
- the stabilization inside the heads is realized by regulating the pressure in the reservoir 5.
- the external recirculation through the distribution tube 31 returns the ink to the reservoir 5.
- This auxiliary circuit can be obtained by means of the insertion, on the collection manifold 41, of two three-way valves 14a and 14b, located, respectively, upstream and downstream of the pump 43 so that there is a direct connection of the downstream valve 14b with the reservoir 5.
- the reversal of the flow in the collection manifold 41 can thus be realized very simply, by activating the valves 14a and 14b so that the ink is collected from the reservoir 5 through the first channel 14c and pushed by the pump 43 so as to re-enter the collection manifold 41 through the second channel 14d.
Landscapes
- Ink Jet (AREA)
- Flow Control (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL13720035T PL2834073T3 (pl) | 2012-04-05 | 2013-02-27 | Układ dozujący do drukarek atramentowych |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT000093A ITMO20120093A1 (it) | 2012-04-05 | 2012-04-05 | Sistema di alimentazione per stampanti a getto di inchiostro. |
| PCT/IB2013/051559 WO2013150396A1 (en) | 2012-04-05 | 2013-02-27 | Supply system for inkjet printers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2834073A1 EP2834073A1 (en) | 2015-02-11 |
| EP2834073B1 true EP2834073B1 (en) | 2015-10-21 |
Family
ID=46028068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13720035.8A Active EP2834073B1 (en) | 2012-04-05 | 2013-02-27 | Supply system for inkjet printers |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP2834073B1 (pl) |
| CN (1) | CN104185557B (pl) |
| ES (1) | ES2553244T3 (pl) |
| IT (1) | ITMO20120093A1 (pl) |
| PL (1) | PL2834073T3 (pl) |
| PT (1) | PT2834073E (pl) |
| SM (1) | SMT201500275B (pl) |
| WO (1) | WO2013150396A1 (pl) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3829880B1 (en) * | 2018-07-30 | 2022-06-29 | Sicpa Holding Sa | Ink delivery system for a printing module and method for delivering ink |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITUB20154980A1 (it) * | 2015-10-16 | 2017-04-16 | Sacmi | Sistema di alimentazione per una stampante a getto di inchiostro |
| EP3219495B1 (en) | 2016-03-16 | 2020-08-05 | Canon Production Printing Holding B.V. | A method for circulation of a liquid in a printer |
| IT201600095603A1 (it) * | 2016-09-23 | 2018-03-23 | In Te Sa S P A | 1 impianto per l'alimentazione dell'inchiostro in macchine ink-jet per la stampa di piastrelle di grande formato |
| JP6930320B2 (ja) * | 2017-09-14 | 2021-09-01 | セイコーエプソン株式会社 | 液体噴射装置、液体噴射装置の液体排出方法 |
| WO2019130532A1 (ja) * | 2017-12-28 | 2019-07-04 | コニカミノルタ株式会社 | インクジェットヘッド及びインクジェット記録装置 |
| CN109624512A (zh) * | 2018-12-10 | 2019-04-16 | 珠海市彩诺电子科技有限公司 | 一种数码打印机的全压循环供墨系统 |
| US11338588B2 (en) * | 2018-12-20 | 2022-05-24 | Kateeva, Inc. | Print material feed system |
| US10940691B2 (en) * | 2019-02-06 | 2021-03-09 | Xerox Corporation | System and method for attenuating ink weeping and air ingestion in a printhead moved by an articulating arm |
| WO2020171714A1 (en) * | 2019-02-22 | 2020-08-27 | Xyrec Ip B.V. | Printing system and method for printing on three-dimensional surfaces |
| CN110014740A (zh) * | 2019-04-24 | 2019-07-16 | 贵州联合数创科技发展有限公司 | 广告印刷喷墨管理装置 |
| IT202100008606A1 (it) * | 2021-04-07 | 2022-10-07 | Alfa Impianti Srl | Dispositivo per la smaltatura di manufatti e relativo impianto |
| IT202000031805A1 (it) * | 2020-12-22 | 2022-06-22 | A I S R L | Sistema di stabilizzazione inchiostro per stampanti ink-jet. |
| US12409607B2 (en) * | 2022-09-01 | 2025-09-09 | General Electric Company | Gas control systems for purging a printhead manufacturing apparatus |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4555709A (en) * | 1984-04-12 | 1985-11-26 | The Mead Corporation | Ink reconstitution system and method for ink drop printer |
| FR2619753B2 (fr) * | 1986-12-10 | 1990-08-31 | Imaje Sa | Circuit d'alimentation fluide d'une tete d'impression equipee d'une cellule multifonctions comportant une chambre a volume variable |
| GB0121909D0 (en) * | 2001-09-11 | 2001-10-31 | Xaar Technology Ltd | Droplet deposition apparatus |
| CN1509884A (zh) * | 2002-12-24 | 2004-07-07 | 上海华科特种墨水研究所 | 彩色颜料喷墨打印机及其喷墨打印方法 |
| GB2447919B (en) * | 2007-03-27 | 2012-04-04 | Linx Printing Tech | Ink jet printing |
| CN101497265B (zh) * | 2008-01-28 | 2011-08-31 | 株式会社日立产机系统 | 喷墨记录装置 |
| AT507142B1 (de) | 2008-08-14 | 2011-05-15 | Durst Phototechnik Digital Technology Gmbh | Tintenversorgungssystem und verfahren zum reinigen eines tintenversorgungssystems |
| JP5178577B2 (ja) * | 2009-02-23 | 2013-04-10 | 富士フイルム株式会社 | インクジェットヘッド及びインクジェット記録方法 |
| JP5417240B2 (ja) * | 2009-05-07 | 2014-02-12 | 理想科学工業株式会社 | インクジェット印刷装置 |
| JP5417242B2 (ja) * | 2010-04-01 | 2014-02-12 | 理想科学工業株式会社 | インクジェットプリンタ |
-
2012
- 2012-04-05 IT IT000093A patent/ITMO20120093A1/it unknown
-
2013
- 2013-02-27 CN CN201380014901.XA patent/CN104185557B/zh active Active
- 2013-02-27 PT PT137200358T patent/PT2834073E/pt unknown
- 2013-02-27 ES ES13720035.8T patent/ES2553244T3/es active Active
- 2013-02-27 EP EP13720035.8A patent/EP2834073B1/en active Active
- 2013-02-27 WO PCT/IB2013/051559 patent/WO2013150396A1/en not_active Ceased
- 2013-02-27 PL PL13720035T patent/PL2834073T3/pl unknown
-
2015
- 2015-11-04 SM SM201500275T patent/SMT201500275B/it unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3829880B1 (en) * | 2018-07-30 | 2022-06-29 | Sicpa Holding Sa | Ink delivery system for a printing module and method for delivering ink |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2553244T3 (es) | 2015-12-07 |
| ITMO20120093A1 (it) | 2013-10-06 |
| CN104185557B (zh) | 2016-08-17 |
| CN104185557A (zh) | 2014-12-03 |
| PL2834073T3 (pl) | 2016-01-29 |
| WO2013150396A1 (en) | 2013-10-10 |
| PT2834073E (pt) | 2015-11-23 |
| SMT201500275B (it) | 2016-01-08 |
| EP2834073A1 (en) | 2015-02-11 |
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