EP1491344A2 - Système d'alimentation pour appareil d'impression - Google Patents

Système d'alimentation pour appareil d'impression Download PDF

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Publication number
EP1491344A2
EP1491344A2 EP20040076854 EP04076854A EP1491344A2 EP 1491344 A2 EP1491344 A2 EP 1491344A2 EP 20040076854 EP20040076854 EP 20040076854 EP 04076854 A EP04076854 A EP 04076854A EP 1491344 A2 EP1491344 A2 EP 1491344A2
Authority
EP
European Patent Office
Prior art keywords
circuit
printhead
regulation
hydraulic
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.)
Withdrawn
Application number
EP20040076854
Other languages
German (de)
English (en)
Other versions
EP1491344A3 (fr
Inventor
Marco Bonetti
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.)
KOBOLD SISTEMI S.R.L.
Original Assignee
Kobold Sistemi SNC Di Bonetti Marco & C
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 Kobold Sistemi SNC Di Bonetti Marco & C filed Critical Kobold Sistemi SNC Di Bonetti Marco & C
Publication of EP1491344A2 publication Critical patent/EP1491344A2/fr
Publication of EP1491344A3 publication Critical patent/EP1491344A3/fr
Withdrawn legal-status Critical Current

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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 refers to a system for supplying a printing apparatus, for example used in packaging lines.
  • Printheads used for printing on packages both of the piezoelectric type and of the thermal type, when they emit a jet of ink from their outlet nozzles, create a depression inside ink ducts connected to such nozzles. Such a depression allows an amount of ink to be sucked up, for example from a reservoir, corresponding to the amount of ink emitted by the printing nozzles.
  • a drawback of these types of system is that it does not allow the position of the head to be varied with respect to the reservoir itself.
  • a drawback is that these systems, combined with printheads having small nozzles, do not operate correctly since sometimes small air bubbles can be created inside the printing nozzles which result in printing with missing parts or poor print quality. Moreover, the substantial vastness of area to be printed forces the use of large ink reservoirs, to avoid having to frequently replace small reservoirs, which would involve frequent expensive idle times.
  • the purpose of the present invention is that of realising a system for supplying a printing apparatus, for example used in packaging lines, which is reliable and also able to be integrated into already existing supply systems, to solve the problems stated previously.
  • Another purpose is that of realising a supply system that does not determine air bubbles inside the printing nozzles and that prevents the possibility of having an amount of air at the their outlet such as to compromise the printing and to require an intervention to restore correct operation.
  • the object of the present invention is a system for supplying a printing apparatus comprising a primary hydraulic circuit that allows the ink to flow from a supply reservoir with a substantially constant pressure and a secondary hydraulic circuit, positioned between said primary circuit and a printhead, comprising a regulation electrovalve, a second pressure sensor, an electronic regulation circuit and a hydraulic pumping device suitable for maintaining a predetermined depression in a supply duct of said printhead.
  • a system for supplying a printing apparatus comprising a primary hydraulic circuit 2 and a secondary hydraulic circuit 3 arranged substantially in series with each other suitable for supplying a printhead.
  • the primary hydraulic circuit 2 comprises a supply reservoir 21 of the ink for such a printing apparatus, a supply pump 22, a first pressure sensor 23 and a first electronic control circuit 24 of such a pump 22.
  • Such a primary circuit is suitable for picking up ink from the reservoir and generating a substantially constant pressure of between 0.2 and 0.4 bar going out from the pump 22 entering into such a secondary circuit.
  • the first control circuit 24 and the pressure sensor 23 are suitable for controlling the operation of the pump 22, so that such a pressure is substantially constant.
  • the system for supplying a printing apparatus foresees that between said primary circuit and the printing apparatus, for example printheads 4, the secondary circuit is inserted suitable for transforming the pressure going out from the primary circuit (around 0.2 bar) into a predetermined depression, for example between -1 millibar and -3 millibar, so as to be able to correctly supply the printheads 4 described above, which work in depression.
  • the secondary circuit is suitable for maintaining such a predetermined depression, in a supply duct of said printhead.
  • the secondary circuit 3 so as to be able to finely adjust the pressure of the printing ink, comprises a regulation electrovalve 31, a second pressure sensor 32, an electronic regulation circuit 33 and a hydraulic pumping device 34.
  • the device 34 can, for example, be realised through a small hydraulic capacity consisting of two simple, suitably shaped, opposite drums placed between the second pressure sensor and the printhead 4.
  • the regulation circuit 33 determines the opening and closing of the regulation electrovalve, according to the pressure detected by the second pressure sensor, which has high sensitivity and is capable of detecting depressions in the order of 0.1 mbar.
  • a depression is created that pulls the ink back inside the printhead and through the suitable opening of the electrovalve the depression is maintained close to the optimal value (for example between -1 millibar and -3 millibar).
  • the regulation circuit 33 can comprise a microprocessor and a memory in which a regulation programme is stored.
  • the regulation circuit of the secondary hydraulic circuit and the electronic control circuit of the primary hydraulic circuit can be integrated in a single control and regulation device comprising a microprocessor.
  • This regulation system can easily be integrated into already existing systems or else advantageously integrated into the same printhead 4.
  • the regulation system can thus comprise the printhead 4 and also the ink reservoir 21 that advantageously can contain a sensor, to detect whether the reservoir is empty, through a signal used by the control and regulation device.
  • the regulation circuit can be interfaced with the electrical signals that command the printhead, to obtain real time control of the successful printing, through an instant comparison between amount of ink required and the amount of ink delivered.

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  • Ink Jet (AREA)
EP04076854A 2003-06-26 2004-06-25 Système d'alimentation pour appareil d'impression Withdrawn EP1491344A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20031305 2003-06-26
IT001305A ITMI20031305A1 (it) 2003-06-26 2003-06-26 Sistema di alimentazione di un apparato di stampa.

Publications (2)

Publication Number Publication Date
EP1491344A2 true EP1491344A2 (fr) 2004-12-29
EP1491344A3 EP1491344A3 (fr) 2008-03-26

Family

ID=30131304

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04076854A Withdrawn EP1491344A3 (fr) 2003-06-26 2004-06-25 Système d'alimentation pour appareil d'impression

Country Status (2)

Country Link
EP (1) EP1491344A3 (fr)
IT (1) ITMI20031305A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2361771A3 (fr) * 2010-02-23 2011-12-28 Fujifilm Corporation Appareil d'évaluation d'anomalies et procédé d'évaluation d'anomalies d'un système d'alimentation en liquides

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6250747B1 (en) * 1999-01-28 2001-06-26 Hewlett-Packard Company Print cartridge with improved back-pressure regulation

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6428156B1 (en) * 1999-11-02 2002-08-06 Hewlett-Packard Company Ink delivery system and method for controlling fluid pressure therein
US6508545B2 (en) * 2000-12-22 2003-01-21 Hewlett-Packard Company Apparatus for providing ink to an ink jet print head

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6250747B1 (en) * 1999-01-28 2001-06-26 Hewlett-Packard Company Print cartridge with improved back-pressure regulation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2361771A3 (fr) * 2010-02-23 2011-12-28 Fujifilm Corporation Appareil d'évaluation d'anomalies et procédé d'évaluation d'anomalies d'un système d'alimentation en liquides
US8567895B2 (en) 2010-02-23 2013-10-29 Fujifilm Corporation Abnormality judgment apparatus and abnormality judgment method of liquid supply system

Also Published As

Publication number Publication date
ITMI20031305A0 (it) 2003-06-26
EP1491344A3 (fr) 2008-03-26
ITMI20031305A1 (it) 2004-12-27

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