EP0137313B1 - Device for an ink jet apparatus for marking recording mediums - Google Patents

Device for an ink jet apparatus for marking recording mediums Download PDF

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Publication number
EP0137313B1
EP0137313B1 EP84110636A EP84110636A EP0137313B1 EP 0137313 B1 EP0137313 B1 EP 0137313B1 EP 84110636 A EP84110636 A EP 84110636A EP 84110636 A EP84110636 A EP 84110636A EP 0137313 B1 EP0137313 B1 EP 0137313B1
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EP
European Patent Office
Prior art keywords
ejector
liquid
printing
head
liquid component
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Expired
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EP84110636A
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German (de)
French (fr)
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EP0137313A1 (en
Inventor
Emmeran Ing. Grad. Vollert
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Siemens AG
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Siemens AG
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Publication of EP0137313A1 publication Critical patent/EP0137313A1/en
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    • 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
    • B41J2/15—Arrangement thereof for serial 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
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2107—Ink jet for multi-colour printing characterised by the ink properties
    • B41J2/2114—Ejecting specialized liquids, e.g. transparent or processing liquids

Definitions

  • the invention relates to a device for writing to a recording medium for ink writing devices according to the preamble of claim 1.
  • Another known measure provides for a gas or air flow to be directed onto the writing point after the writing liquid has been applied to the recording medium and thereby to reduce the drying time (US Pat. No. 4,340,893).
  • Another known arrangement is based on this principle of using two components as writing means, in which a non-pigmented liquid component ejected from a thin nozzle moves through a layer consisting of a second pigmented liquid component (US Pat. No. 4,196,437). .
  • the droplets emerging after penetrating the layer then form the actual writing fluid.
  • the unpigmented liquid component can e.g. B. can also be a drying agent.
  • the object of the invention is to improve the application of the individual liquid components in an ink writing device according to the generic term and with a structurally simple device while ensuring a constant flight speed and size of the droplets forming the characters, both the drying time of the droplets forming the characters on the recording medium and to reduce the consumption of the second liquid component.
  • Embodiments of the specified device are characterized in the subclaims.
  • the invention is essentially associated with the advantage that a liquid component causing the rapid drying of the writing liquid is dispensed separately from the actual writing head, that is to say the nozzles of the writing head can no longer become blocked due to drying, caused by evaporation of the solvent, and that it is possible is to use components that do not require special recording media.
  • both the liquid component emitted by the write head and the liquid component emitted by the ejection device can extend further Limits z. B. in terms of dye content, viscosity, evaporation, surface tension, etc. can be adjusted in an optimal manner.
  • the spatial separation of the individual components of the writing fluid causes drying of the component that contains the colors z. B. Avoided by evaporation of the solvent
  • neither the flight speed nor the size of those droplets that form the sign is changed.
  • the second ejection device is advantageously equipped with a spraying device, with the result that the second liquid component is applied in a distributed manner only over the area of a raster-recorded character.
  • FIGS. 1 and 2 is based on an arrangement in which the characters shown on the recording medium each after the application of the liquid component on the write head with the second liquid component, for. B. sprayed with a drying solvent.
  • the ejection device in the form of a second ejection head 2 is arranged spatially adjacent.
  • the writing head 1 and the ejection device 2 are arranged together on a writing carriage 3. This is moved in the line direction in front of the recording medium 4 by means of drive elements, not shown here.
  • the write head 1 and the ejection device 2 each have a liquid reservoir 5 and 6, a nozzle part 7 and 8 and electrical connections 9 and 10.
  • the nozzle part 7 or 8 is, for example, a nozzle plate.
  • the nozzle part 7 of the write head 1 has seven nozzle openings 11, from which individual droplets are expelled under the action of electromechanical transducers, not shown here.
  • this can be done in such a way that the nozzle openings are each connected to an ink channel running inside the write head, on which a piezo crystal acts.
  • the piezo crystal z. B. as a tube, which includes the ink channel over a part of its length, is generated with a corresponding control of the piezo tube inside the ink channel, caused by a change in the inner diameter of the piezo tube, a shock or pressure wave, which causes droplet ejection.
  • the second ejection device 2 has only a single nozzle opening 12, the diameter of which can be equal to or larger than the diameter of the nozzles 11 of the write head 1.
  • the ejection device 2 is equipped with a device for atomizing liquid. That can e.g. B. can be achieved by dispensing the liquid with a higher ejection frequency. This ensures that the liquid component, which is a drying solvent, is sprayed onto the recording medium 4 in a more or less finely divided form from the nozzle opening 12 of the ejection device 2.
  • the ejection device 2 is advantageously displaceable on the writing carriage 3 in such a way that its distance b from the recording medium 4 can be adjusted in accordance with the size of the surface to be sprayed.
  • the liquid component of the ejection device 2 then completely covers the dot matrix formed by the droplets emitted by the write head 1. Since a very rapid reaction occurs on the recording medium between the liquid components discharged from the ejection device 2 and the liquid components discharged from the write head 1, a disturbing impairment of the typeface is excluded.
  • the ejection device 2 is preferably arranged at a distance a from the writing head 1 on the writing carriage 3 such that its liquid is always dispensed when a complete character has been written. This distance is determined by the selected character grid for the representation of a character. For further explanation, reference is made to FIG. 3, in which a 7 ⁇ 5 grid for the representation of characters is assumed.
  • the discharge of the liquid component by the ejection device 2 preferably takes place at a point in time which is determined by the movement of the writing carriage by five grid columns.
  • 3 shows, after the corresponding number of droplets have been sprayed onto the recording medium in the manner characteristic of the character “E, the write head 1 has moved from the position 1a to the position 1b.
  • the output z. B. initiated by a control pulse derived from the corresponding column clock and the character «E •, d. H. the area 13 within which the character “E is shown” is covered with the liquid component dispensed by the ejection device 2.
  • this is z. B. smudge-proof.
  • the ejection device can have a number of outlet openings which corresponds in number and arrangement to the outlet openings of the write head.
  • FIGS. 4 and 5 show an exemplary embodiment of this.
  • the print head 1 and the ejection device 14 are in turn arranged on a common writing carriage 3 which is moved in front of the recording medium 4. Likewise, both each have a liquid container 5 and 6 for receiving the liquid components of the writing liquid.
  • the ejection device 14, like the write head 1 has seven outlet openings 15.
  • the ejection device 14 and the write head 1 are spatially offset by the distance a, but are at the same distance from the recording medium 4.
  • the control of the nozzles of the ejection device 14 takes place here with the same control pulse pattern that is supplied to the write head 1 to represent the characters. However, the ejection device is actuated at different times.
  • Both the spatially staggered arrangement and the staggered activation are determined by the mode of operation of the ink writing device. Based on a character representation in a 7 x 5 grid with a one-piece nozzle arrangement z. B. the distance a is three column steps and the activation of the ejection device 14 can be initiated with a delay determined by the same value. In this case, z.
  • the points forming the vertical row of the character “E” also point by point almost immediately after the application of the liquid components by the writing head with the liquid component through the ejection device.
  • the ejection device is arranged above or below the write head.
  • the ejection from the ejection device is switched on by a pulse derived from the line memory (page memory).
  • line memory page memory

Landscapes

  • Ink Jet (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum Beschreiben eines Aufzeichnungsträgers für Tintenschreibeinrichtungen gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a device for writing to a recording medium for ink writing devices according to the preamble of claim 1.

Für den Einsatz von Tintenschreibeinrichtungen, bei denen einzelne Tintentröpfchen unter Einwirkung von individuellen Ansteuerungsimpulsen auf einen Aufzeichnungsträger gespritzt werden, bestehen hinsichtlich des Schriftbildes eine Reihe von Anforderungen. So ist es z. B. sehr erwünscht, unmittelbar nach dem Aufbringen der Tintentröpfchen ein wischfestes Schriftbild zu erhalten. Weiterhin sollen die geschriebenen Zeichen kontrastreich sein. Beide Forderungen sollen weitgehend unabhängig vom Material des Aufzeichnungsträgers sein. Dem stehen jedoch bestimmte Anforderungen entgegen, die an die Schreibflüssigkeit gestellt werden. Diese Anforderungen ergeben sich im wesentlichen aus der Funktion derartiger Schreibeinrichtungen. Der wesentliche Punkt, der in diesem Zusammenhang eine Rolle spielt ist, daß an sich bekannte Mittel, die der Schreibflüssigkeit zugesetzt werden können, um die Trocknungszeit zu reduzieren, nicht nur zu einer Reduzierung der Trocknungszeit auf dem Aufzeichnungsträger führen, sondern auch in den sehr feinen und dünnen Austrittsöffnungen des Schreibkopfes ein Eintrocknen bewirken, so daß diese verstopf werden. Ähnliches gilt auch für die Zusätze, mit denen eine Kontrasterhöhung erreicht werden kann. Bereits der Ausfall einzelner Düsen führt zu einer deutlichen Verschlechterung des Schriftbildes. Der Ausfall sämtlicher Düsen bedeutet, daß der Schreibkopf, d. h. die gesamte Schreibeinrichtung, nicht mehr einsatzfähig ist.For the use of ink writing devices in which individual ink droplets are sprayed onto a recording medium under the influence of individual control pulses, there are a number of requirements with regard to the typeface. So it is z. B. very desirable to get a smudge-proof typeface immediately after applying the ink droplets. Furthermore, the written characters should be rich in contrast. Both requirements should be largely independent of the material of the record carrier. However, there are certain requirements that are placed on the writing fluid. These requirements essentially result from the function of such writing devices. The essential point that plays a role in this connection is that known means, which can be added to the writing liquid in order to reduce the drying time, lead not only to a reduction in the drying time on the recording medium, but also in the very fine ones and thin outlet openings of the print head cause drying, so that they become blocked. The same applies to the additives with which a contrast increase can be achieved. Even the failure of individual nozzles leads to a significant deterioration in the typeface. The failure of all of the nozzles means that the write head, i. H. the entire writing device is no longer operational.

Zur Verkürzung der Trocknungszeit ist die Verwendung einer besonderen Tinte angegeben worden (DE-S 31 28 231). Diese Wirkung beruht darauf, daß der Tinte Cyclo Hexanol zugegeben wird. Die Herstellung einer derartigen Tinte ist jedoch aufwendig, da die Zusammensetzung, vor allem die Dosierung der einzelnen Bestandteile sehr exakt erfolgen muß. Die Anwendung ist deshalb auf besondere Einsatzfälle beschränkt, wie beispielsweise auf die Verwendung zum Beschreiben von stark geleimtem Papier oder von Folien.The use of a special ink has been specified to shorten the drying time (DE-S 31 28 231). This effect is due to the fact that cyclo hexanol is added to the ink. However, the production of such an ink is complex since the composition, especially the dosage of the individual components, has to be carried out very precisely. The application is therefore limited to special applications, such as the use for writing on strongly sized paper or foils.

Ein andere bekannte Maßnahme sieht vor, nach dem Aufbringen der Schreibflüssigkeit auf den Aufzeichnungsträger einen Gas- oder Luftstrom auf die Schreibstelle zu richten und dadurch die Trocknungszeit zu reduzieren (US-PS 4 340 893).Another known measure provides for a gas or air flow to be directed onto the writing point after the writing liquid has been applied to the recording medium and thereby to reduce the drying time (US Pat. No. 4,340,893).

Hierfür sind relativ aufwendige zusätzliche Vorrichtungen erforderlich.This requires relatively complex additional devices.

Andere bekannte Vorschläge sehen vor, die Flüssigkeitskomponenten der Schreibflüssigkeit erst auf dem Aufzeichnungsträger zusammenzubringen. So ist es zur Verbesserung der Haftung und Abdunklung, d. h. Sichtbarmachung der einen, als helle Flüssigkeit vorliegende Tintenkomponente bekannt, auf die gesamte Oberfläche des Aufzeichnungsträgers zunächst die andere Tintenkomponente in Form eines die Abdunkelung bewirkenden Lösungsmittels aufzutragen, auf die dann die die Zeichen bildenden Tintentröpfchen aus der ersten Tintenkomponente auftragen werden. Alternativ können aber auch auf den Aufzeichnungsträger erst diese Tintentröpfchen aus der ersten Flüssigkeitskomponente aufgebracht werden, die dann von dem Lösungsmittel aus der zweiten Flüssigkeitskomponente übersprüht werden (EP-A-034 881). Das Beschreiben von glatten Oberflächen wird hier dadurch ermöglicht, daß sozusagen nicht die glatte Oberfläche, sondern die Deckschicht beschrieben wird. Die Probleme einer schnellen Trocknung bzw. die Gewährleistung der Wischfestigkeit unmittelbar nach dem Beschreiben bleiben ungelöst.Other known proposals provide that the liquid components of the writing liquid are first brought together on the recording medium. So it is to improve adhesion and darkening, d. H. Visualization of the one ink component known as a light liquid, first apply the other ink component to the entire surface of the recording medium in the form of a darkening solvent, to which the ink droplets forming the characters from the first ink component are then applied. Alternatively, however, these ink droplets from the first liquid component can first be applied to the recording medium, which are then sprayed over by the solvent from the second liquid component (EP-A-034 881). The description of smooth surfaces is made possible by the fact that, so to speak, it is not the smooth surface but the cover layer that is described. The problems of quick drying or the guarantee of smudge resistance immediately after writing remain unsolved.

Auf diesem Prinzip, zwei Komponenten als Schreibmittel zu verwenden, beruht auch eine weitere bekannte Anordnung, bei der sich eine aus einer dünnen Düse ausgestoßene, nicht pigmentierte Flüssigkeitskomponente durch eine aus einer zweiten, pigmentierten Flüssigkeitskomponente bestehenden Schicht hindurchbewegt (US-PS 4 196 437). Die nach Durchdringung der Schicht austretenden Tröpfchen bilden dann die eigentliche Schreibflüssigkeit. Die nicht pigmentierte Flüssigkeitskomponente kann z. B. auch ein die Trocknung förderndes Mittel sein. Neben einem damit verbundenen beachtlichen Aufwand besteht die Gefahr, daß Tröpfchen unterschiedlicher Größe mit unterschiedlichen Geschwindigkeiten ausgestoßen werden.Another known arrangement is based on this principle of using two components as writing means, in which a non-pigmented liquid component ejected from a thin nozzle moves through a layer consisting of a second pigmented liquid component (US Pat. No. 4,196,437). . The droplets emerging after penetrating the layer then form the actual writing fluid. The unpigmented liquid component can e.g. B. can also be a drying agent. In addition to the considerable effort involved, there is a risk that droplets of different sizes will be expelled at different speeds.

Aufgabe der Erfindung ist es, in einer Tintenschreibeinrichtung gemäß dem Gattungsbegriff das Aufbringen der einzelnen Flüssigkeitskomponenten zu verbessern und mit einer konstruktiv einfachen Vorrichtung unter Gewährleistung einer konstanten Fluggeschwindigkeit und Größe der die Zeichen bildenden Tröpfchen sowohl die Trocknungszeit der die Zeichen bildenden Tröpfchen auf dem Aufzeichnungsträger als auch den Verbrauch der zweiten Flüssigkeitskomponente zu reduzieren.The object of the invention is to improve the application of the individual liquid components in an ink writing device according to the generic term and with a structurally simple device while ensuring a constant flight speed and size of the droplets forming the characters, both the drying time of the droplets forming the characters on the recording medium and to reduce the consumption of the second liquid component.

Diese Aufgabe wird gemäß den kennzeichnenden Merkmalen des Patentanspruchs 1 gelöst.This object is achieved in accordance with the characterizing features of patent claim 1.

Ausgestaltungen der angegebenen Vorrichtung sind in den Unteransprüchen gekennzeichnet.Embodiments of the specified device are characterized in the subclaims.

Mit der Erfindung ist im wesentlichen der Vorteil verbunden, daß eine die schnelle Trocknung der Schreibflüssigkeit bewirkende Flüssigkeitskomponente getrennt vom eigentlichen Schreibkopf abgegeben wird, daß also die Düsen des Schreibkopfes wegen Eintrocknens, hervorgerufen durch Verdunstung des Lösungsmittels, nicht mehr verstopfen können, und daß es möglich ist, Komponenten zu verwenden, die keine Spezialaufzeichnungsträger erfordern.The invention is essentially associated with the advantage that a liquid component causing the rapid drying of the writing liquid is dispensed separately from the actual writing head, that is to say the nozzles of the writing head can no longer become blocked due to drying, caused by evaporation of the solvent, and that it is possible is to use components that do not require special recording media.

Zugleich kann sowohl die vom Schreibkopf als auch die von der Ausstoßvorrichtung abgegebene Flüssigkeitskomponente innerhalb weiter Grenzen z. B. hinsichtlich Farbstoffgehalt, Viskosität, Verdunstung, Oberflächenspannung usw. in optimaler Weise angepaßt werden. Die räumliche Trennung der einzelnen Komponenten der Schreibflüssigkeit bewirkt, daß ein Eintrocknen der Komponente, die die Farben enthält z. B. durch Verdunstung des Lösungsmittels vermieden wive Schließlich wird weder die Fluggeschwindigkeit noch die Größe derjenigen Tröpfchen verändert, die das Zeichen bilden. Die zweite Ausstoßvorrichtung ist vorteilhaft mit einer Sprüheinrichtung ausgerüstet, womit erreicht wird, daß jeweils nur über den Bereich eines rasterförmig aufgezeichneten Zeichens die zweite Flüssigkeitskomponente verteilt aufgetragen wird.At the same time, both the liquid component emitted by the write head and the liquid component emitted by the ejection device can extend further Limits z. B. in terms of dye content, viscosity, evaporation, surface tension, etc. can be adjusted in an optimal manner. The spatial separation of the individual components of the writing fluid causes drying of the component that contains the colors z. B. Avoided by evaporation of the solvent Finally, neither the flight speed nor the size of those droplets that form the sign is changed. The second ejection device is advantageously equipped with a spraying device, with the result that the second liquid component is applied in a distributed manner only over the area of a raster-recorded character.

Zur Erläuterung der Erfindung wird auf die Zeichnungen verwiesen. Dort zeigen

  • Figur 1 ein Beispiel, mit einer eine einzige Austrittsöffnung aufweisenden Ausstoßvorrichtung für die zweite Flüssigkeitskomponente in Aufsicht,
  • Figur 2 die Anordnung nach Fig. 1 in Seitenansicht,
  • Figur 3 ein Beispiel zur Erläuterung der Funktionsweise dieser Vorrichtung,
  • Figur 4 ein Beispiel mit einer mehrere Austrittsöffnungen aufweisenden Ausstoßvorrichtung in Aufsicht, und
  • Figur 5 die Anordnung nach Fig. 4 in Vorderansicht.
To explain the invention, reference is made to the drawings. Show there
  • FIG. 1 shows an example with an ejection device for the second liquid component having a single outlet opening in supervision,
  • 2 shows the arrangement of FIG. 1 in side view,
  • FIG. 3 shows an example to explain the functioning of this device,
  • 4 shows an example with a discharge device having a plurality of outlet openings in supervision, and
  • Figure 5 shows the arrangement of FIG. 4 in front view.

Dem Ausführungsbeispiel nach Fig. 1 und 2 liegt eine Anordnung zugrunde, bei der die auf dem Aufzeichnungsträger dargestellten Zeichen jeweils nach dem Aufbringen der Flüssigkeitskomponente auf dem Schreibkopf mit der zweiten Flüssigkeitskomponente, z. B. mit einem trocknenden Lösungsmittel besprüht werden.The embodiment of FIGS. 1 and 2 is based on an arrangement in which the characters shown on the recording medium each after the application of the liquid component on the write head with the second liquid component, for. B. sprayed with a drying solvent.

In den Figuren 1 und 2 sind die für das Verständnis der Erfindung notwendigen Teile einer Tintenschreibeinrichtung dargestellt. Neben dem eigentlichen Schreibkopf 1, der in seinem Aufbau und in seiner Wirkungsweise an sich bekannt ist, ist die Ausstoßvorrichtung in Form eines zweiten Ausstoßkopfes 2 räumlich benachbart angeordnet.1 and 2 show the parts of an ink writing device necessary for understanding the invention. In addition to the actual write head 1, which is known per se in terms of its structure and mode of operation, the ejection device in the form of a second ejection head 2 is arranged spatially adjacent.

Der Schreibkopf 1 und die Ausstoßvorrichtung 2 sind gemeinsam auf einem Schreibwagen 3 angeordnet. Dieser wird mittels hier nicht dargestellter Antriebselemente in Zeilenrichtung vor dem Aufzeichnungsträger 4 bewegt. Der Schreibkopf 1 und die Ausstoßvorrichtung 2 weisen jeweils einen Flüssigkeitsvorratsbehälter 5 und 6, einen Düsenteil 7 und 8 und elektrische Anschlüsse 9 und 10 auf. Der Düsenteil 7 bzw. 8 ist beispielsweise eine Düsenplatte.The writing head 1 and the ejection device 2 are arranged together on a writing carriage 3. This is moved in the line direction in front of the recording medium 4 by means of drive elements, not shown here. The write head 1 and the ejection device 2 each have a liquid reservoir 5 and 6, a nozzle part 7 and 8 and electrical connections 9 and 10. The nozzle part 7 or 8 is, for example, a nozzle plate.

Der Düsenteil 7 des Schreibkopfes 1 besitzt im Beispiel sieben Düsenöffnungen 11, aus denen unter der Einwirkung hier nicht dargestellter elektromechanischer Wandler einzelne Tröpfchen augestoßen werden. Bekanntlich kann das in der Weise geschehen, daß die Düsenöffnungen jeweils mit einem, im Inneren des Schreibkopfes verlaufenden Tintenkanal verbunden sind, auf den ein Piezokristall einwirkt. Gestaltet man den Piezokristall z. B. als Röhrchen aus, das den Tintenkanal über einen Teil seiner Länge umfaßt, so wird bei entsprechender Ansteuerung des Piezoröhrchens im Inneren des Tintenkanals, verursacht durch eine Veränderung des Innendurchmessers des Piezoröhrchens eine Stoß- oder Druckwelle erzeugt, die einen Tröpfchenausstoß bewirkt. Durch eine entsprechende Relativbewegung zwischen dem Schreibkopf und dem Aufzeichnungsträger lassen sich somit rasterförmig aufgebaute Zeichen darstellen.In the example, the nozzle part 7 of the write head 1 has seven nozzle openings 11, from which individual droplets are expelled under the action of electromechanical transducers, not shown here. As is known, this can be done in such a way that the nozzle openings are each connected to an ink channel running inside the write head, on which a piezo crystal acts. If you design the piezo crystal z. B. as a tube, which includes the ink channel over a part of its length, is generated with a corresponding control of the piezo tube inside the ink channel, caused by a change in the inner diameter of the piezo tube, a shock or pressure wave, which causes droplet ejection. By means of a corresponding relative movement between the write head and the record carrier, it is thus possible to display characters in a grid pattern.

Die zweite Ausstoßvorrichtung 2 besitzt im Bespiel nur eine einzige Düsenöffnung 12, deren Durchmesser gleich oder größer sein kann als der Durchmesser der Düsen 11 des Schreibkopfes 1. Die Ausstoßvorrichtung 2 ist mit einer Einrichtung zur Zerstäubung von Flüssigkeit ausgerüstet. Das kann z. B. dadurch erreicht werden, daß die Flüssigkeit mit einer höheren Ausstoßfrequenz abgegeben wird. Damit wird erreicht, daß die Flüssigkeitskomponente, die ein trocknendes Lösungsmittel ist, aus der Düsenöffnung 12 der Ausstoßvorrichtung 2 in mehr oder weniger fein verteilter Form auf den Aufzeichnungsträger 4 aufgesprüht wird. Vorteilhafterweise ist die Ausstoßvorrichtung 2 auf dem Schreibwagen 3 derart verschiebbar, daß deren Abstand b zum Aufzeichnungsträger 4 entsprechend der Größe der zu besprühenden Fläche einstellbar ist. Diese ist im wesentlichen durch die Zeilenhöhe bzw. durch die Höhe h eines Zeichens bestimmt. Die Flüssigkeitskomponente der Austoßvorrichtung 2 überdeckt dann das durch die vom Schreibkopf 1 abgegebenen Tröpfchen gebildete Punktraster vollständig. Da zwischen der von der Ausstoßvorrichtung 2 abgegebenen Flüssigkeitskomponenten mit der vom Schreibkopf 1 abgegebenen Flüssigkeitskomponenten eine sehr schnelle Reaktion auf dem Aufzeichnungsträger eintritt, ist eine störende Beeinträchtigung des Schriftbildes ausgeschlossen.In the example, the second ejection device 2 has only a single nozzle opening 12, the diameter of which can be equal to or larger than the diameter of the nozzles 11 of the write head 1. The ejection device 2 is equipped with a device for atomizing liquid. That can e.g. B. can be achieved by dispensing the liquid with a higher ejection frequency. This ensures that the liquid component, which is a drying solvent, is sprayed onto the recording medium 4 in a more or less finely divided form from the nozzle opening 12 of the ejection device 2. The ejection device 2 is advantageously displaceable on the writing carriage 3 in such a way that its distance b from the recording medium 4 can be adjusted in accordance with the size of the surface to be sprayed. This is essentially determined by the line height or the height h of a character. The liquid component of the ejection device 2 then completely covers the dot matrix formed by the droplets emitted by the write head 1. Since a very rapid reaction occurs on the recording medium between the liquid components discharged from the ejection device 2 and the liquid components discharged from the write head 1, a disturbing impairment of the typeface is excluded.

Die Ausstoßvorrichtung 2 ist vorzugsweise in einem solchen Abstand a zum Schreibkopf 1 auf dem Schreibwagen 3 angeordnet, daß deren Flüssigkeitsabgabe stets dann stattfindet, wenn ein vollständiges Zeichen geschrieben wurde. Dieser Abstand ist durch das gewählte Zeichenraster für die Darstellung eines Zeichens bestimmt. Zur weiteren Erläuterung wird auf Fig. 3 verwiesen, bei der von einem 7 x 5 Raster zur Zeichendarstellung ausgegangen wird.The ejection device 2 is preferably arranged at a distance a from the writing head 1 on the writing carriage 3 such that its liquid is always dispensed when a complete character has been written. This distance is determined by the selected character grid for the representation of a character. For further explanation, reference is made to FIG. 3, in which a 7 × 5 grid for the representation of characters is assumed.

Für das in Fig. 3 dargestellte Zeichen « E » geschieht das bei Verwendung einer einreihigen Düsenplatte mit insgesamt sieben Düsenöffnungen 11 folgendermaßen. Befindet sich der Schreibkopf 1 in der Stellung 1a, so werden sämtliche Düsen erregt. In der Rasterspalte 1 werden an den durch die Düsenanordnung bestimmten Punkten Tröpfchen aufgespritzt. Nach Bewegung des Schreibkopfes um einen Spaltenabstand werden die oberste, die mittlere und die unterste Düse erregt. Dadurch wird der Aufbau der horizontalen Linien des Zeichens begonnen. Diese Vorgänge setzen sich fort, bis mit dem fünften Spaltenschritt der Schreibkopf in die Stellung 1 gelangt. Damit ist der Aufbau des Zeichens « E beendet. Zur Einhaltung des Abstandes zwischen aufeinanderfolgenden Zeichen unterbleibt während einiger folgender Spaltenschritte, im Beispiel während der Spaltenschritte 6 und 7 eine Ansteuerung der Düsen. Der gesamte Druckzyklus umfaßt in diesem Beispiel somit sieben Spaltenschritte.For the character “E” shown in FIG. 3, this happens as follows when using a single-row nozzle plate with a total of seven nozzle openings 11. If the write head 1 is in position 1a, all the nozzles are excited. In the grid column 1, droplets are sprayed on at the points determined by the nozzle arrangement. After moving the print head a column distance, the top, middle and bottom nozzle are excited. This will begin building the horizontal lines of the character. These processes continue until the fifth column step causes the write head to position 1 arrives. The construction of the character «E is now complete. To maintain the spacing between successive characters, the nozzles are not activated during some of the following column steps, in the example during column steps 6 and 7. In this example, the entire printing cycle thus comprises seven column steps.

Bei dem gewählten Beispiel geschieht die Abgabe der Flüssigkeitskomponente durch die Ausstoßvorrichtung 2 vorzugsweise zu einem Zeitpunkt, der durch die Bewegung des Schreibwagens um fünf Rasterspalten bestimmt ist. Wie Fig. 3 zeigt hat sich, nachdem die entsprechende Anzahl von Tröpfchen in der für das Zeichen « E Charakteristischen Weise auf den Aufzeichnungsträger aufgespritzt worden sind, der Schreibkopf 1 von der Stellung 1a in die Stellung 1b bewegt. Die Ausstoßvorrichtung 2, die sich inzwischen von der Stellung 2a in die Stellung 2b bewegt hat, befindet sich nunmehr in der Mitte vor dem Zeichen « E ». In dieser Stellung wird der Ausstoß z. B. durch einen vom entsprechenden Spaltentakt abgleiteten Steuerimpuls eingeleitet und das Zeichen « E •, d. h. der Bereich 13, innerhalb dem das Zeichen « E dargestellt ist, wird mit der von der Ausstoßvorrichtung 2 abgegebenen Flüssigkeitskomponente bedeckt. Im Ergebnis ist unmittelbar nach Abdruck eines Zeichens dieses z. B. wischfest.In the selected example, the discharge of the liquid component by the ejection device 2 preferably takes place at a point in time which is determined by the movement of the writing carriage by five grid columns. 3 shows, after the corresponding number of droplets have been sprayed onto the recording medium in the manner characteristic of the character “E, the write head 1 has moved from the position 1a to the position 1b. The ejection device 2, which has meanwhile moved from the position 2a to the position 2b, is now in the middle in front of the symbol “E”. In this position, the output z. B. initiated by a control pulse derived from the corresponding column clock and the character «E •, d. H. the area 13 within which the character “E is shown” is covered with the liquid component dispensed by the ejection device 2. As a result, this is z. B. smudge-proof.

In Ausgestaltung der Erfindung kann die Ausstoßvorrichtung eine in ihrer Anzahl und in ihrer Anordnung den Austrittsöffnungen des Schreibkopfes entsprechenden Anzahl von Austrittsöffnungen besitzen.In an embodiment of the invention, the ejection device can have a number of outlet openings which corresponds in number and arrangement to the outlet openings of the write head.

Ein Ausführungsbeispiel dafür zeigen die Figuren 4 und 5. Schreibkopf 1 und Ausstoßvorrichtung 14 sind wiederum auf einem gemeinsamen Schreibwagen 3 angeordnet, der vor dem Aufzeichnungsträger 4 bewegt wird. Ebenso besitzen beide jeweils einen Flüssigkeitsbehälter 5 und 6 zur Aufnahme der Flüssigkeitskomponenten der Schreibflüssigkeit. Im Unterschied zum Ausführungsbeispiel nach Fig. 1 und 2 weist die Ausstoßvorrichtung 14 ebenso wie der Schreibkopf 1 sieben Austrittsöffnungen 15 auf. Ausstoßvorrichtung 14 und Schreibkopf 1 sind räumlich um den Abstand a versetzt angeordnet, besitzen jedoch den gleichen Abstand zum Aufzeichnungsträger 4. Die Ansteuerung der Düsen der Ausstoßvorrichtung 14 erfolgt hier mit dem gleichen Steuerimpulsmuster, die dem Schreibkopf 1 zur Darstellung der Zeichen zugeführt werden. Allerdings erfolgt die Ansteuerung der Ausstoßvorrichtung zeitlich versetzt. Sowohl die räumlich versetzte Anordnung als auch die zeitlich versetzte Ansteuerung sind durch die Betriebsweise der Tintenschreibeinrichtung bestimmt. Unter Zugrundelegung einer Zeichendarstellung in einem 7 x 5 Raster mit einer einteiligen Düsenanordnung kann z. B. der Abstand a drei Spaltenschritte betragen und die Ansteuerung der Ausstoßvorrichtung 14 kann um eine durch den gleichen Wert bestimmte Zeit verzögert eingeleitet werden. In diesem Falle werden dann z. B. die die senkrechte Reihe des Zeichens « E » bildenden Punkte ebenfalls punktweise nahezu unmittelbar nach dem Aufbringen der Flüssigkeitskomponenten durch den Schreibkopf mit der Flüssigkeitskomponente durch die Ausstoßvorrichtung überdeckt. Mit dem punktweisen und frühzeitigen Abdecken ist nicht nur ein sparsamerer Flüssigkeitsverbrauch verbunden, sondern es wird auch eine Verbesserung bei der Reaktion der beiden Flüssigkeitskomponenten auf dem Aufzeichnungsträger, z. B. eine schnellere Trocknung, erreicht.FIGS. 4 and 5 show an exemplary embodiment of this. The print head 1 and the ejection device 14 are in turn arranged on a common writing carriage 3 which is moved in front of the recording medium 4. Likewise, both each have a liquid container 5 and 6 for receiving the liquid components of the writing liquid. In contrast to the exemplary embodiment according to FIGS. 1 and 2, the ejection device 14, like the write head 1, has seven outlet openings 15. The ejection device 14 and the write head 1 are spatially offset by the distance a, but are at the same distance from the recording medium 4. The control of the nozzles of the ejection device 14 takes place here with the same control pulse pattern that is supplied to the write head 1 to represent the characters. However, the ejection device is actuated at different times. Both the spatially staggered arrangement and the staggered activation are determined by the mode of operation of the ink writing device. Based on a character representation in a 7 x 5 grid with a one-piece nozzle arrangement z. B. the distance a is three column steps and the activation of the ejection device 14 can be initiated with a delay determined by the same value. In this case, z. For example, the points forming the vertical row of the character “E” also point by point almost immediately after the application of the liquid components by the writing head with the liquid component through the ejection device. With the point-by-point and early masking, not only is more economical liquid consumption connected, but there is also an improvement in the reaction of the two liquid components on the recording medium, e.g. B. faster drying.

In einer weiteren Ausgestaltung ist die Ausstoßvorrichtung ober- bzw. unterhalb des Schreibkopfes angeordnet. Der Ausstoß aus der Austoßvorrichtung wird dabei durch einen vom Zeilenspeicher (Seitenspeicher) abgeleiteten Impuls eingeschaltet. Diese Ausgestaltung ist besonders bei bidirektional schreibenden Einrichtungen vorteilhaft, wenn die zweite Komponente entweder immer nach bzw. vor der Schreibflüssigkeit aufgebracht werden muß.In a further embodiment, the ejection device is arranged above or below the write head. The ejection from the ejection device is switched on by a pulse derived from the line memory (page memory). This configuration is particularly advantageous in the case of bidirectional writing devices if the second component must always be applied either after or before the writing liquid.

Claims (8)

1. A device for ink jet printers for printing on a data carrier, with a printing liquid which contains two liquid components, wherein at least the individual droplets of the first liquid component which form a character, are ejected from individual nozzles of a printing head under the action of drive pulses and wherein the second liquid component is emitted on to the data carrier in staggered fashion with respect to time so that it covers the droplets, characterised in that on the printer carriage (3) which carries the printing head (1) which is known per se, a further ejector (2, 14) is provided which is arranged so as to be offset with respect to the printing head (1) ; that the individual liquid components of the printing liquid are contained separately in the liquid supply container (5) of the printing head (1) and in the liquid supply container (6) of the ejector (2, 14) ; and that the liquid component of the printing liquid which is contained in the liquid supply container (5) of the ejector (2, 14) is a drying solvent.
2. A device as claimed in Claim 1, characterised in that the ejector (2) has at least one outlet opening (12) and emits the liquid component in atomised or spray form.
3. A device as claimed in Claim 1 and 2, characterised in that the ejector (2) has only one outlet opening (12) ; that to enable the distance (b) between the outlet opening (12) of the ejector (2) and the data carrier (4) to be adjusted, the ejector (2) is arranged so as to be displaceable on the printer carriage (3) ; and that the distance (b) is such that the sprayed areas on the data carrier (4) correspond to the height (h) of a character.
4. A device as claimed in Claim 1 and 2, characterised in that the ejector (2) is so arranged on the printer carriage (3) as to be offset relative to the printer head (1), referred to the printing direction, by a distance (a) which is determined by the number of columns and the column spacings of a printing cycle (c) provided for the representation of a character.
5. A device as claimed in Claim 4, characterised in that the distance (a) between the ejector (2) and the printer head (1) is such that when the printing of a character by the printer head (1) has been concluded, the ejector (2) is located approximately in the centre of the printed character.
6. A device as claimed in Claim 4 and 5, characterised in that the ejector (2) can be switched on for the duration of each spraying process by a pulse derived from the column clock signal of the printing head.
7. A device as claimed in Claim 1, characterised in that the ejector (14) has a number of outlet openings (15) which are identical in respect of number and arrangement to the outlet openings (11) of the printer head (1) and which are at the same distance from the data carrier (4) as the outlet openings (11) of the printer head (1) ; that the ejector (14) and the printer head (1) emit the appropriate liquid component droplet-by-droplet at the same droplet ejection speed ; and that the drive pulses for the droplet-by-droplet ejection of the liquid component from the ejector (14) are identical to the drive pulses for the droplet-by-droplet ejection of the liquid component from the printer head ( 1), but are staggered in time in relation thereto by at least one column step.
8. A device as claimed in Claim 1, characterised in that the ejector (2, 14) is arranged above or below the printer head (1) ; and that the ejector (2, 14) can be switched on by a pulse derived from the row memory.
EP84110636A 1983-09-08 1984-09-06 Device for an ink jet apparatus for marking recording mediums Expired EP0137313B1 (en)

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DE3332491A DE3332491C2 (en) 1983-09-08 1983-09-08 Device for ink writing devices for writing on a recording medium
DE3332491 1983-09-08

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JPS6078752A (en) 1985-05-04
DE3332491C2 (en) 1985-10-10
DE3332491A1 (en) 1985-03-28
DE3465039D1 (en) 1987-09-03
EP0137313A1 (en) 1985-04-17
US4599627A (en) 1986-07-08

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