EP0494385A1 - Liquid jet printing method - Google Patents

Liquid jet printing method Download PDF

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Publication number
EP0494385A1
EP0494385A1 EP91121127A EP91121127A EP0494385A1 EP 0494385 A1 EP0494385 A1 EP 0494385A1 EP 91121127 A EP91121127 A EP 91121127A EP 91121127 A EP91121127 A EP 91121127A EP 0494385 A1 EP0494385 A1 EP 0494385A1
Authority
EP
European Patent Office
Prior art keywords
nozzles
drops
gas
gas jet
recording medium
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Withdrawn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
EP91121127A
Other languages
German (de)
French (fr)
Inventor
Klaus Dietrich
Stephan Günther
Norbert Knoth
Friedrich-Viktor Miehe
Wolfgang Dr. Thiel
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.)
Francotyp Postalia GmbH
Original Assignee
Francotyp Postalia GmbH
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 Francotyp Postalia GmbH filed Critical Francotyp Postalia GmbH
Publication of EP0494385A1 publication Critical patent/EP0494385A1/en
Withdrawn legal-status Critical Current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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/05—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers produced by the application of heat
    • 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
    • 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
    • B41J2/03—Ink jet characterised by the jet generation process generating a continuous ink jet by pressure
    • B41J2002/031—Gas flow deflection

Definitions

  • the invention relates to a method for liquid jet printing systems, in particular for franking and stamping machines, in which characters and graphic representations are generated on a recording medium by ejecting drops from nozzles.
  • the invention had for its object to provide a method which ensures a reliable deflection of the drops of a liquid jet printing system with a high drop sequence regardless of loading problems.
  • the advantage of the invention is the use of a controlled gas jet to deflect the drops. Thereby all problems of charging the drops in an electrical field and the associated uniform admixture of mainly magnetic components to the writing liquid are eliminated.
  • the invention is explained in more detail below on the basis of a schematic diagram.
  • the sketch shows the scheme for the deflection of drops from a nozzle. Several such systems can be combined with one another.
  • the nozzles 1 are arranged horizontally to the recording medium 3.
  • the emerging drops 4 thus contain a horizontal movement component in their trajectory.
  • the drops 4 are, for example, continuously ejected from the nozzle 1 at a constant frequency.
  • the nozzle can be vibrated by means of a piezoelectric transducer in order to be able to eject the drops at a constant frequency.
  • a gas nozzle 2 is arranged vertically to the record carrier 3 and to the nozzle 1, from which a gas jet directed perpendicular to the record carrier 3 emerges. This gas jet is subject to control and accordingly causes the individual drops 4 to be deflected in the direction of the recording medium 3.
  • the controllable speed of the gas jet causes a differently inclined trajectory of the droplets 4.
  • the droplets 4 can thus be positioned at different locations on the recording medium 3.
  • a further solution for positioning the drops 4 on the recording medium 3 is the reversal of the aforementioned principle: with a constant gas jet from the gas nozzle 2, the ejection speed of the drops 4 is varied.
  • the latter can be implemented in a known manner via miniature pumps actuated by magnetic coils.
  • the exit of the drops 4 from the nozzle 1 can be triggered by the injector effect of the gas jet of the gas nozzle 2 which is directed past the nozzle opening.
  • air is used as the gas.
  • Special gas mixtures tailored to the consistency of the writing fluid, can help to increase the printing speed of the system. It is also possible for advertising purposes to add fragrances to the liquid and / or gas.
  • a collecting device 5 for undeflected drops 4 is provided opposite the nozzle 1.
  • the liquid collected therein is fed back into the storage container via appropriate devices.

Abstract

In a liquid jet printing method, provision is made for nozzles (1) for discharging droplets (4) to be arranged horizontally relative to the printing carrier (3), which droplets are deflected towards the printing carrier (3) by jets of gas from gas nozzles (2) disposed vertically relative to said nozzles (1). <IMAGE>

Description

Die Erfindung betrifft ein Verfahren für Flüssigkeitsstrahl-Drucksysteme, insbesondere für Frankier- und Wertstempelmaschinen, bei dem durch Ausstoßen von Tropfen aus Düsen Schriftzeichen und grafische Darstellungen auf einem Aufzeichnungsträger erzeugt werden.The invention relates to a method for liquid jet printing systems, in particular for franking and stamping machines, in which characters and graphic representations are generated on a recording medium by ejecting drops from nozzles.

Es ist bekannt (DE 23 43 420 B2, DE 25 20 702 C3, DE 25 48 885 A1, DE 26 19 103 A1) bei Flüssigkeitsstrahl-Drucksystemen die Flüssigkeitsdüsen vertikal gegenüber dem Aufzeichnungsträger anzuordnen. Vor den Düsenaustrittsöffnungen sind Elektroden zum Aufladen von Flüssigkeitstropfen und zum Ablenken der Tropfen gesetzt. Ein kontinuierlicher Tropfenstrom in Abhängigkeit von der Austrittsgeschwindigkeit aus den Düsen und der Viskosität der Flüssigkeit, der sich begrenzt zur Erhöhung einer höheren Schreibgeschwindigkeit verändern läßt, ist dabei notwendig. Durch eine solche Frequenzerhöhung ergibt sich ein geringerer Ausstoßabstand der Tropfen untereinander Dies kann zu Problemen der Aufladung der Tropfen führen.It is known (DE 23 43 420 B2, DE 25 20 702 C3, DE 25 48 885 A1, DE 26 19 103 A1) to arrange the liquid nozzles vertically with respect to the recording medium in liquid jet printing systems. Electrodes for charging liquid drops and for deflecting the drops are placed in front of the nozzle outlet openings. A continuous drop flow depending on the exit speed from the nozzles and the viscosity of the liquid, which can be changed to increase a higher writing speed, is necessary. Such an increase in frequency results in a shorter ejection distance between the drops. This can lead to problems with the charging of the drops.

Der Erfindung lag die Aufgabe zugrunde, ein Verfahren zu schaffen, das unabhängig von Ladungsproblemen eine sichere Ablenkung der Tropfen eines Flüssigkeitsstrahl-Drucksystems bei hoher Tropfenfolge gewährleistet.The invention had for its object to provide a method which ensures a reliable deflection of the drops of a liquid jet printing system with a high drop sequence regardless of loading problems.

Diese Aufgabe wurde durch die Erfindung gelöst, wie sie im Kennzeichnungsteil des ersten Patentanspruches dargelegt ist. Die Unteransprüche beschreiben weitere vorteilhafte Lösungen.This object has been achieved by the invention as set out in the characterizing part of the first claim. The sub-claims describe further advantageous solutions.

Der Vorteil der Erfindung besteht in der Nutzung eines gesteuerten Gasstrahls zur Ablenkung der Tropfen. Dadurch entfallen sämtliche Probleme der Aufladung der Tropfen in einem elektrischen Feld und die damit zusammenhängende gleichmäßige Beimischung hauptsächlich magnetischer Bestandteile zur Schreibflüssigkeit.The advantage of the invention is the use of a controlled gas jet to deflect the drops. Thereby all problems of charging the drops in an electrical field and the associated uniform admixture of mainly magnetic components to the writing liquid are eliminated.

Anhand einer Prinzipskizze wird die Erfindung nachfolgend näher erläutert. Die Skizze zeigt das Schema für die Ablenkung von Tropfen einer Düse. Mehrere solcher Systeme können miteinander kombiniert werden.The invention is explained in more detail below on the basis of a schematic diagram. The sketch shows the scheme for the deflection of drops from a nozzle. Several such systems can be combined with one another.

Gegenüber den bekannten Flüssigkeitsstrahl-Drucksystemen sind die Düsen 1 horizontal zum Aufzeichnungsträger 3 angeordnet. Die austretenden Tropfen 4 enthalten in ihrer Flugbahn somit eine horizontale Bewegungskomponente.Compared to the known liquid jet printing systems, the nozzles 1 are arranged horizontally to the recording medium 3. The emerging drops 4 thus contain a horizontal movement component in their trajectory.

Die Tropfen 4 werden beispielsweise kontinuierlich mit konstanter Frequenz aus der Düse 1 ausgeworfen. Dazu kann bekannterweise die Düse über einen piezoelektrischen Wandler in Schwingung versetzt werden, um die Tropfen mit konstanter Frequenz ausstoßen zu können.The drops 4 are, for example, continuously ejected from the nozzle 1 at a constant frequency. For this purpose, as is known, the nozzle can be vibrated by means of a piezoelectric transducer in order to be able to eject the drops at a constant frequency.

Vertikal zum Aufzeichnungsträger 3 und zur Düse 1 ist eine Gasdüse 2 angeordnet, aus der ein senkrecht zum Aufzeichnungsträger 3 gerichteter Gasstrahl austritt. Dieser Gasstrahl unterliegt einer Steuerung und bewirkt dementsprechend eine Ablenkung der einzelnen Tropfen 4 in Richtung des Aufzeichnungsträgers 3.A gas nozzle 2 is arranged vertically to the record carrier 3 and to the nozzle 1, from which a gas jet directed perpendicular to the record carrier 3 emerges. This gas jet is subject to control and accordingly causes the individual drops 4 to be deflected in the direction of the recording medium 3.

Die steuerbare Geschwindigkeit des Gasstrahles bewirkt eine unterschiedlich geneigte Flugbahn der Tropfen 4. Damit sind die Tropfen 4 an verschiedenen Stellen des Aufzeichnungsträgers 3 positionierbar.The controllable speed of the gas jet causes a differently inclined trajectory of the droplets 4. The droplets 4 can thus be positioned at different locations on the recording medium 3.

Eine weitere Lösung zur Positionierung der Tropfen 4 auf dem Aufzeichnungsträger 3 ist die Umkehrung des vorgenannten Prinzips: Bei einem konstanten Gasstrahl aus der Gasdüse 2 wird die Ausstoßgeschwindigkeit der Tropfen 4 variiert. Letzteres kann in bekannter Weise über Magnetspulen betätigte Miniaturpumpen realisiert werden. Der Austritt der Tropfen 4 aus der Düse 1 kann dabei durch die Injektor-Wirkung des an der Düsenöffnung vorbeigeleiteten Gasstrahles der Gasdüse 2 ausgelöst werden.A further solution for positioning the drops 4 on the recording medium 3 is the reversal of the aforementioned principle: with a constant gas jet from the gas nozzle 2, the ejection speed of the drops 4 is varied. The latter can be implemented in a known manner via miniature pumps actuated by magnetic coils. The exit of the drops 4 from the nozzle 1 can be triggered by the injector effect of the gas jet of the gas nozzle 2 which is directed past the nozzle opening.

Die vektorielle Addition der Bewegungskomponenten des Gasstrahles und der Tropfen 4 führt zu den Flugbahnänderungen, wobei jeweils eine Austrittsgeschwindigkeit, entweder die der Tropfen 4 oder die des Gasstrahles, gesteuert wird.The vectorial addition of the motion components of the gas jet and the droplets 4 leads to changes in the trajectory, an exit speed, either that of the droplets 4 or that of the gas jet, being controlled in each case.

Als Gas dient im einfachsten Fall Luft. Spezielle Gasmischungen, abgestimmt auf die Konsistenz der Schreibflüssigkeit, können zur Erhöhung der Druckgeschwindigkeit des Systems beitragen. Außerdem ist es für werbetechnische Zwecke möglich, Duftstoffe der Flüssigkeit und/oder dem Gas beizumengen.In the simplest case, air is used as the gas. Special gas mixtures, tailored to the consistency of the writing fluid, can help to increase the printing speed of the system. It is also possible for advertising purposes to add fragrances to the liquid and / or gas.

In bekannter Weise ist der Düse 1 gegenüberliegend eine Auffangeinrichtung 5 für nicht abgelenkte Tropfen 4 vorgesehen. Über entsprechende Einrichtungen wird die darin gesammelte Flüssigkeit dem Vorratsbehälter wieder zugeführt.In a known manner, a collecting device 5 for undeflected drops 4 is provided opposite the nozzle 1. The liquid collected therein is fed back into the storage container via appropriate devices.

Claims (4)

Verfahren für Flüssigkeitsstrahl-Drucksysteme,insbesondere für Frankier- und Wertstempelmaschinen, bei dem durch Ausstoßen von Tropfen aus Düsen Schriftzeichen und grafische Darstellungen auf einem Aufzeichnungsträger erzeugt werden,
gekennzeichnet durch
gegenüber dem Aufzeichnungsträger (3) horizontal angeordnete Düsen (1) zum Ausstoßen von Tropfen (4) und vertikal zu den Düsen (1) und dem Aufzeichnungsträger (3) angeordnete Gasdüsen (2) zum Ausstoßen eines Gasstrahles, der dem Umlenken der aus den Düsen (1) austretenden Tropfen (4) in Richtung des Aufzeichnungsträgers dient.Method for liquid jet printing systems, in particular for franking and stamping machines, in which characters and graphic representations are generated on a recording medium by ejecting drops from nozzles,
marked by
nozzles (1) arranged horizontally with respect to the recording medium (3) for ejecting drops (4) and gas nozzles (2) arranged vertically with respect to the nozzles (1) and the recording medium (3) for ejecting a gas jet which deflects those out of the nozzles (1) emerging drops (4) serves in the direction of the record carrier. Verfahren nach Anspruch 1, gekennzeichnet durch einen kontinuierlichen Ausstoß von Tropfen (4) aus den Düsen (1) mit konstanter Frequenz und einer binären Steuerung des Gasstrahles mit steuerbaren Austrittsgeschwindigkeiten.A method according to claim 1, characterized by a continuous ejection of drops (4) from the nozzles (1) at a constant frequency and a binary control of the gas jet with controllable outlet speeds. Verfahren nach Anspruch 1, gekennzeichnet durch einen kontinuierlichen Gasstrahl und einen in seiner Frequenz und seiner Geschwindigkeit variierbaren Tropfenausstoß der Düse (1).A method according to claim 1, characterized by a continuous gas jet and a droplet discharge of the nozzle (1) which is variable in frequency and speed. Verfahren nach Anspruch 1 bis 3, gekennzeichnet durch Nutzung der Injektorwirkung des Gasstrahles zum Auslösen des Tropfenaustrittes aus der Düse (1).Method according to Claims 1 to 3, characterized by using the injector effect of the gas jet to trigger the drop outlet from the nozzle (1).
EP91121127A 1991-01-09 1991-12-10 Liquid jet printing method Withdrawn EP0494385A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4100729 1991-01-09
DE4100729A DE4100729A1 (en) 1991-01-09 1991-01-09 METHOD FOR LIQUID JET PRINTING SYSTEMS

Publications (1)

Publication Number Publication Date
EP0494385A1 true EP0494385A1 (en) 1992-07-15

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Application Number Title Priority Date Filing Date
EP91121127A Withdrawn EP0494385A1 (en) 1991-01-09 1991-12-10 Liquid jet printing method

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EP (1) EP0494385A1 (en)
KR (1) KR920014621A (en)
CA (1) CA2059006A1 (en)
CS (1) CS4792A3 (en)
DE (1) DE4100729A1 (en)
HU (1) HUT60192A (en)
PL (1) PL292743A1 (en)
ZA (1) ZA9269B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1221373A2 (en) * 2000-12-28 2002-07-10 Eastman Kodak Company Ink drop deflection amplifier mechanism and method of increasing ink drop divergence
EP1219429A3 (en) * 2000-12-28 2003-01-29 Eastman Kodak Company A continuous ink-jet printing method and apparatus
US6554410B2 (en) * 2000-12-28 2003-04-29 Eastman Kodak Company Printhead having gas flow ink droplet separation and method of diverging ink droplets
EP1332877A1 (en) * 2002-02-01 2003-08-06 Eastman Kodak Company Continuous ink jet printing method and apparatus
US6746108B1 (en) 2002-11-18 2004-06-08 Eastman Kodak Company Method and apparatus for printing ink droplets that strike print media substantially perpendicularly
WO2007133421A1 (en) * 2006-05-04 2007-11-22 Eastman Kodak Company Deflected drop liquid pattern deposition

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2704514A1 (en) * 1976-02-05 1977-08-11 Hertz Carl H METHOD AND DEVICE FOR GENERATING AN INKJET RECORD
JPS56146773A (en) * 1980-04-16 1981-11-14 Mitsubishi Electric Corp Ink printing device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3869986A (en) * 1974-01-16 1975-03-11 Pitney Bowes Inc Ink jet postage printing apparatus
US4019188A (en) * 1975-05-12 1977-04-19 International Business Machines Corporation Micromist jet printer
GB1521874A (en) * 1977-03-01 1978-08-16 Itt Creed Printing apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2704514A1 (en) * 1976-02-05 1977-08-11 Hertz Carl H METHOD AND DEVICE FOR GENERATING AN INKJET RECORD
JPS56146773A (en) * 1980-04-16 1981-11-14 Mitsubishi Electric Corp Ink printing device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 6, no. 29 (M-113)(907) 20. Februar 1982 & JP-A-56 146 773 ( S. MATSUI ) 14. November 1981 *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1221373A2 (en) * 2000-12-28 2002-07-10 Eastman Kodak Company Ink drop deflection amplifier mechanism and method of increasing ink drop divergence
EP1221373A3 (en) * 2000-12-28 2002-07-31 Eastman Kodak Company Ink drop deflection amplifier mechanism and method of increasing ink drop divergence
US6508542B2 (en) 2000-12-28 2003-01-21 Eastman Kodak Company Ink drop deflection amplifier mechanism and method of increasing ink drop divergence
EP1219429A3 (en) * 2000-12-28 2003-01-29 Eastman Kodak Company A continuous ink-jet printing method and apparatus
US6554410B2 (en) * 2000-12-28 2003-04-29 Eastman Kodak Company Printhead having gas flow ink droplet separation and method of diverging ink droplets
US6588888B2 (en) * 2000-12-28 2003-07-08 Eastman Kodak Company Continuous ink-jet printing method and apparatus
US6863385B2 (en) 2000-12-28 2005-03-08 Eastman Kodak Company Continuous ink-jet printing method and apparatus
EP1332877A1 (en) * 2002-02-01 2003-08-06 Eastman Kodak Company Continuous ink jet printing method and apparatus
US6746108B1 (en) 2002-11-18 2004-06-08 Eastman Kodak Company Method and apparatus for printing ink droplets that strike print media substantially perpendicularly
WO2007133421A1 (en) * 2006-05-04 2007-11-22 Eastman Kodak Company Deflected drop liquid pattern deposition
US7413293B2 (en) 2006-05-04 2008-08-19 Eastman Kodak Company Deflected drop liquid pattern deposition apparatus and methods

Also Published As

Publication number Publication date
PL292743A1 (en) 1992-07-13
ZA9269B (en) 1992-10-28
KR920014621A (en) 1992-08-25
CS4792A3 (en) 1992-08-12
HU913762D0 (en) 1992-03-30
DE4100729A1 (en) 1992-07-16
HUT60192A (en) 1992-08-28
CA2059006A1 (en) 1992-07-10

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