DE3245283A1 - Arrangement for expelling liquid droplets - Google Patents
Arrangement for expelling liquid dropletsInfo
- Publication number
- DE3245283A1 DE3245283A1 DE19823245283 DE3245283A DE3245283A1 DE 3245283 A1 DE3245283 A1 DE 3245283A1 DE 19823245283 DE19823245283 DE 19823245283 DE 3245283 A DE3245283 A DE 3245283A DE 3245283 A1 DE3245283 A1 DE 3245283A1
- Authority
- DE
- Germany
- Prior art keywords
- nozzles
- electromagnets
- ink
- arrangement according
- tongues
- 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- Withdrawn
Links
Classifications
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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
- B41J2/015—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
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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
- B41J2/015—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
- B41J2002/041—Electromagnetic transducer
-
- 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
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2002/14387—Front shooter
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
Description
Anordnung zum Ausstoß von FlüssigkeitströpfchenArrangement for ejecting liquid droplets
Die Erfindung betrifft eine Anordnung gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to an arrangement according to the preamble of the patent claim 1.
Ein wesentliches Kriterium für Tintenschreibeinrichtungen, mit denen die Zeichen auf einem Aufzeichnungsträger durch eine Vielzahl von aus den Düsen eines Schreibkopfes ausgestoßenen einzelnen Tintentröpfchen dargestellt werden, stellt die Schriftqualität dar. Offensichtlich wird mit einer Reduzierung des Abstandes der einzelnen Rasterpunkte auch die Qualität der dargestellten Zeichen verbessert.An essential criterion for ink writing devices with which the characters on a recording medium through a plurality of from the nozzles individual ink droplets ejected from a print head are represented, represents the quality of the font. It becomes evident when the spacing is reduced of the individual grid points also improves the quality of the characters displayed.
Ein entscheidendes Problem stellt dabei die Teilung der Austrittsöffnungen, d.h. die Teilung der Düsen im Schreibkopf dar.A crucial problem is the division of the outlet openings, i.e. the division of the nozzles in the write head.
Für einen Schreibkopf, bei dem als Antriebselemente für den Ausstoß von Tintentröpfchen röhrenförmige Piezoelemente verwendet werden ist es bekannt, die Piezoelemente in einiger Entfernung von der die Düsenöffnungen enthaltenden Düsenplatte anzuordnen und zwischen den Piezowandlern und den Düsen verlaufende Tintenkanäle vorzusehen. Diese können dann in Richtung zur Düsenplatte hin konvergierend verlaufen (DE-PS 25 43 451). Man erreicht damit zwar eine enge Teilung der Düsen, doch treten mit zunehmendem Abstand zwischen den Düsen und den Piezowandlern .auch Probleme bei der Inbetriebnahme und bei der Füllung auf.For a write head in which as drive elements for the ejection tubular piezoelectric elements are used by ink droplets, it is known the piezo elements at some distance from the one containing the nozzle openings To arrange nozzle plate and running between the piezo transducers and the nozzles Provide ink channels. These can then converge in the direction of the nozzle plate run (DE-PS 25 43 451). A close pitch of the nozzles is achieved with this, but occur with increasing distance between the nozzles and the piezo transducers .auch Problems with commissioning and filling.
Ein weiteres- Problem entsteht dann, wenn ein Schreibkopf mit einer sehr großen Anzahl von Düsen aufgebaut werden soll. In diesem Fall ergeben sich infolge der zum druckfernen Ende des Kopfes auseinanderlaufenden Tintenkanäle entsprechend große räumliche Abmessungen, die den Einsatz des Schreibkopfes beschränken können.Another problem arises when a write head with a very large number of nozzles is to be built. In this case arise due to the ink channels diverging towards the end of the head remote from the print large spatial dimensions that can limit the use of the write head.
Gemäß einer anderen bekannten Anordnung kann die Teilung der Düsen eines Tintenschreibkopfes dadurch reduziert werden, daß als Antriebselemente stabförmig ausgebildete Piezowandler verwendet werden, die in Form eines sogenannten Piezokammes ausgebildet sind (DE-AS 25 27 647 ).According to another known arrangement, the division of the nozzles an ink recording head can be reduced in that rod-shaped as drive elements trained piezo transducers are used, which are in the form of a so-called piezo comb are formed (DE-AS 25 27 647).
In diesem Falle wirken die den Düsen zugeordneten Zinken oder Zungen des Piezokammes als Biegeschwinger, die einzeln ansteuerbar einen individuellen Tröpfchenausstoß ermöglichen. Es läßt sich damit eine relativ enge Teilung der Düsen und somit auch ein verbessertes Schriftbild erreichen, ohne daß. ein zusätzlicher längerer Tintenkanal zwishen Piezowandler und Düse erforderlich ist, doch treten dabei andere Probleme auf. Diese liegen vor allem darin, daß entsprechend der engen Teilung auch die Abmessungen der Zinken oder Zungen des Piezokammes sehr klein sein müssen. Die Bearbeitung der porösen, sehr spröden und inhomogenen Piezokeramik ist jedoch sehr problematisch. Die für die Herstellung solcher Piezokämme erforderlichen Maßnahmen sind aufwendig. Da an die Piezoelemente für eine wirkungsvolle geometrische Anderung ihrer Abmessungen eine relativ hohe Spannung angelegt werden muß, kann normale Tinte nicht verwendet werden, da Kurzschlüsse zwischen den als Elektroden wirkenden Zungen des Piezokammes auftreten.In this case, the prongs or tongues assigned to the nozzles act of the piezo comb as a flexural oscillator, which can be individually controlled an individual Enable droplet ejection. It can thus be a relatively narrow pitch of the nozzles and thus also achieve an improved typeface without. an additional longer ink channel is required between piezo transducer and nozzle, but occur other problems. These lie mainly in the fact that according to the narrow Division also the dimensions of the prongs or tongues of the piezo comb can be very small have to. The processing of the porous, very brittle and inhomogeneous piezoceramic is however, very problematic. The necessary for the production of such piezo combs Measures are complex. Because of the piezo elements for an effective geometric Changing their dimensions a relatively high voltage must be applied, can normal ink cannot be used because of short circuits between the electrodes acting tongues of the piezo comb occur.
Aus diesem Grunde ist man gezwungen, eine besondere Tinte mit isolierenden Eigenschaften zu verwenden.For this reason one is forced to use a special ink with insulating Properties to use.
Aufgabe der Erfindung ist es, eine Anordnung für den Tröchenausstoß in Tintenschreibeinrichtungen anzugeben, mit der die Teilung der Düsen erheblich reduziert werden kann, bei der die Wandler in unmittelbarer Nähe der Düsen angeordnet werden können, mit der auch ein, eine große Anzahl von Düsen aufweisender Schreibkopf mit kleinen Abmessungen aufgebaut werden kann, bei der weiterhin die Wandler und damit auch ein Mehrdüsenschreibkopf einfach und ohne nennenswerte fertigungstechnische Probleme auch für sehr kleine Abmessungen herstellbar sind, und bei der für den praktischen Einsatz an die Tinte keine besonderen Forderungen gestellt werden müssen.The object of the invention is to provide an arrangement for the ejection of droplets to be indicated in ink writing devices, with which the pitch of the nozzles is considerable can be reduced in which the transducers are arranged in the immediate vicinity of the nozzles can be, with a, a large number of nozzles having writing head can be built with small dimensions, in which the converter and This also means that a multi-nozzle print head is simple and without any significant manufacturing technology Problems can also be produced for very small dimensions, and for the In practice, the ink does not have to meet any special requirements.
Diese Aufgabe wird gemäß den kennzeichnenden Merkmalen des Patentanspruches 1 gelöst.This task is according to the characterizing features of the patent claim 1 solved.
Die erfindungsgemäße Anordnung weist den Vorteil auf, daß die Zinken oder Zungen des verwendeten Kammes als Anker eines Elektromagnetsystems aus metallischem Werkstoff gebildet sind, und daß diese somit in einfacher Weise als Stanzteil, als Atzteil oder als galvanoplastisch geformtes Teil auch für kleinste Abmessungen herstellbar sind. Da die Bruchgefahr derartiger Zunge.n erheblich geringer ist als bei aus Piezokeramik bestehenden Zungen, können diese auch mechanisch erheblich stärker belastet und beansprucht werden. Das bedeutet, daß sie beim Zurückfedern auch gegen die Düsenöffnungen anschlagen können, ohne daß eine Beschädigung zu befürchten ist. Damit ist eine Verbesserung hinsichtlich der Erzeugung eines besonders kräftigen Ausstoßdruckes beim Anschlagen an die Öffnungen verbunden, was sich in einem verbesserten Tröpfchenausstoß auswirkt.The arrangement according to the invention has the advantage that the prongs or tongues of the comb used as an anchor of an electromagnetic system made of metal Material are formed, and that these are thus in a simple manner as a stamped part than Etched part or as an electroformed part can also be produced for the smallest dimensions are. Since the risk of breakage of such tongues is significantly lower than that of piezoceramics existing tongues, these can also be mechanically stressed and considerably more are claimed. This means that they also spring back against the nozzle openings can strike without fear of damage. That’s a Improvement in terms of generating a particularly strong ejection pressure when hitting the openings, which results in improved droplet output affects.
Die erfindungsgemäße Anordnung kann mit gleichen Vorteilen sowohl für einen einreihigen als auch für mehrreihige Düsenanordnungen eingesetzt werden. Der Aufbau eines Schreibkopfes kann in vorteilhafter Weise aus Einzelteilen geschehen, wodurch der fertigungstechnische Aufwand erheblich reduziert wird.The arrangement according to the invention can both with the same advantages can be used for a single-row as well as for multi-row nozzle arrangements. The construction of a writing head can be done in an advantageous manner from individual parts, whereby the manufacturing effort is significantly reduced.
Die Erfindung wird im folgenden unter Bezugnahme auf die Zeichnungen näher erläutert. Dort zeigen Fig. 1 das Prinzip des erfindungsgemäßen Antriebssystems für eine Düse, Fig. 2 die Anordnung der Elektromagnete in gestaffelter Weise für einen Schreibkopf mit mehreren in einer Reihe angeordneten Düsen, Fig. 3 in Form einer Explosionszeichnung den Aufbau eines Schreibkopfes mit einer zweireihigen Düsenanordnung.The invention will be described below with reference to the drawings explained in more detail. 1 shows the principle of the drive system according to the invention for a nozzle, Fig. 2 the arrangement of the electromagnets in a staggered manner for a write head with a plurality of nozzles arranged in a row, FIG. 3 in the form an exploded view of the structure of a write head with a two-row Nozzle arrangement.
Die Düse 1 in Fig. 1 ist als Öffnung in einer Düsenplatte 2 im Beispiel konisch geformt. Der Antrieb besteht aus der beweglichen Zunge 3 eines metallischen Kammes 4 und aus den aus einem Jochteil 5 und einer Spulenanordnung 6 bestehenden Elektromagneten. Dieser ist über einen Anschluß 7 erregbar. Der als Zunge 2 ausgebildete Ankerteil des Elektromagnetsystems erstreckt sich in den mit Tinte gefüllten Raum 8, der über einen Tintenzuführkanal 9 mit einem hier nicht dargestellten Tintenreservoir in VerbindUng steht. Zwischen der Düsenplatte 2 und dem Kamm 4 sowie zwischen dem Kamm 4 und den Polflächen der Elektromagnete 5 ist jeweils eine Dichtplatte 10 und 11 vorgesehen. Die Dichtplatten 10, 11 weisen im Bereich der Düsen 1 Aussparungen auf, durch die der Tintenraum 8 gebildet wird. Die Elektromagnete 5, 6 sind in einem Block 12 zusammengefaßt, in dem auch der Tintenzufuhrkanal 9 verläuft.The nozzle 1 in Fig. 1 is as an opening in a nozzle plate 2 in the example conically shaped. The drive consists of the movable tongue 3 of a metallic one Comb 4 and consisting of a yoke part 5 and a coil assembly 6 Electromagnets. This can be excited via a connection 7. The trained as tongue 2 The armature part of the electromagnet system extends into the space filled with ink 8, which via an ink supply channel 9 with an ink reservoir, not shown here is connected. Between the nozzle plate 2 and the comb 4 and between the Comb 4 and the pole faces of the electromagnets 5 are each a sealing plate 10 and 11 provided. The sealing plates 10, 11 have recesses in the area of the nozzles 1 through which the ink space 8 is formed. The electromagnets 5, 6 are in one Block 12 summarized, in which the ink supply channel 9 also runs.
Die Wirkungsweise der Anordnung ist folgende. Im Ruhezustand, d.h. bei nicht erregtem Elektromagneten 5, 6 nimmt die Zunge 3 die dargestellte Lage ein. Das freie Ende der Zunge 3 befindet sich dabei unmittelbar vor der Eintrittsöffnung der Düse 1, ohne diese zu verschließen. Wird der Elektromagnet z.B. durch einen Ansteuerimpuls am Anschluß 7 von einer hier nicht dargestellten Steuerschaltung erregt, so wird dessen Anker, d.h. die Zunge 3 an das Jochteil 5 gezogen. Mit der Beendigung des Ansteuerimpulses wird der Elektromagnet wieder abgeschaltet und die Zunge 3 schnellt auf Grund ihrer Elastizität zurück, wodurch eine kleine Tintenmenge aus der Düse 1 herausgestoßen und in Form eines Tintentröpfchens gegen einen hier nicht dargestellten Aufzeichnungsträger geschleudert wird. Unmittelbar anschliessend nimmt die Zunge 3 wieder dle Ausgangslage ein, und die Düse 1 wird kapillarisch wieder mit Tinte gefüllt.The mode of operation of the arrangement is as follows. At rest, i.e. when the electromagnet 5, 6 is not energized, the tongue 3 takes the position shown a. The free end of the tongue 3 is located directly in front of the inlet opening the nozzle 1 without closing it. If the electromagnet is e.g. Control pulse at terminal 7 from a control circuit, not shown here energized, its armature, i.e. the tongue 3, is pulled against the yoke part 5. With the Completion of the control pulse, the electromagnet is switched off again and the Tongue 3 springs back due to its elasticity, causing a small amount of ink pushed out of the nozzle 1 and in the form of an ink droplet against one here recording medium, not shown, is spun. Immediately afterwards the tongue 3 takes up the starting position again, and the nozzle 1 becomes capillary refilled with ink.
Die Bruchgefahr der Zungen bei der erfindungsgemäßen Anordnung ist sehr gering, so daß die Zungen auch gegen die Düsenplatte 2 anschlagen können, ohne zerstört zu werden.The risk of breakage of the tongues in the arrangement according to the invention is very low, so that the tongues can strike against the nozzle plate 2 without to be destroyed.
Der Elektromagnet ist mit seinem Jochteil 5 und einer Spule 6 in einem Block, dem sogenannten Magnetblock 11 angeordnet, und in diesem vergossen. Der Magentblock 11 kann dann bearbeitet werden, so daß die Polflächen eben an seiner Oberfläche liegen. Das wirkt sich nicht nur vorteilhaft auf die Funktion und die Betriebssicherheit der Schreibeinrichtung aus, da die Einflüsse von kleinsten Rauhigkeiten und Unebenheiten in der Tintenkammer vermieden werden, sondern bietet ganz besonders vorteilhafte Voraussetzungen für den einfachen Aufbau eines Schreibkopfes.The electromagnet is with its yoke part 5 and a coil 6 in one Block, the so-called magnetic block 11, and potted in this. The stomach block 11 can then be machined so that the pole faces are flat on its surface lie. This not only has a positive effect on function and operational safety the writing device, since the influences of the smallest roughness and unevenness can be avoided in the ink chamber, but offers particularly advantageous Requirements for the simple construction of a print head.
Fig. 2 zeigt ein Beispiel für die Anordnung der Elektromagnete einer Düsenreihe. Obwohl für die erfindungsgemäße Antriebsvorrichtung kleine Elektromagnete eingesetzt werden können, stellen die Spulenanordnungen noch immer ein rela- tiv voluminöses Bauteil dar, was sich auf die Teilung der Düsen selbst auswirkt. Werden jedoch die Elektromagnete gestaffelt im Magnetblock angeordnet, so kann trotzdem die gewünschte enge Teilung der Düsen gewährleistet werden. In Fig. 2 sind mehrere Düsen 1 dargestellt, denen jeweils eine Zunge 3 zugeordnet ist. Die Zungen 3 sind jeweils als Zinken eines Kammes ausgebildet und wirken als die Ankerelemente der Elektromagnete, deren Jochteile wiederum mit 5 und deren Spulen mit 6 bezeichnet sind. Die Elektromagnete sind derart versetzt oder gestaffelt im Magnetblock 11 angeordnet, daß sich die für ein gutes Schriftbild erforderliche enge Teilung der Düsen 1 ohne weiteres erzielen läßt.Fig. 2 shows an example of the arrangement of the electromagnets of a Row of nozzles. Although small electromagnets for the drive device according to the invention can be used, the coil arrangements are still a rela- tiv voluminous component, which affects the division of the nozzles themselves. Will However, the electromagnets are arranged in a staggered manner in the magnet block, so it can anyway the desired close pitch of the nozzles can be guaranteed. In Fig. 2 there are several Nozzles 1 shown, each of which is assigned a tongue 3. The tongues 3 are each designed as the prongs of a comb and act as the anchor elements of the Electromagnets whose yoke parts are in turn denoted by 5 and their coils are denoted by 6 are. The electromagnets are offset or staggered in this way in the magnet block 11 arranged that the close pitch required for a good typeface is the Nozzles 1 can be achieved easily.
Anhand von Fig. 3 ist der Aufbau bzw. der Zusammenbau eines Schreibkopfes mit dem erfindungsgemäßen Antriebssystem zu erkennen. Das in Fig. 3 dargestellte Beispiel zeigt eine zweireihige Düsenanordnung. Von unten nach oben sind hier der Magnetblock 12, eine Abdichtplatte 11, zwei Kämme 4 und 4a, mit den als Zungen 3 ausgebildeten Ankerelementen, eine Abdichtplatte 10 und die Düsenplatte 2 mit den in zwei Reihen angeordneten Düsen 1 dargestellt. Die zum Antrieb vorgesehenen Zungen der beiden Kämme 4 und 4a weisen mit ihren freien Enden aufeinander zu. Es ist zweckmäßig, die Düsen der beiden Düsenreihen, sowie die diesen zugeordneten Zungen jeweils um eine halbe Teilung versetzt zueinander anordnen. Die im Magnetblock 12 liegenden weiteren Teile der Elektromagnetantriebe, nämlich die Jochteile 5 und die Spulen 6 können, wie anhand von Fig. 2 beschrieben wurde, in gestaffelter Weise angeordnet sein.3 shows the structure or assembly of a write head to recognize with the drive system according to the invention. The one shown in FIG Example shows a two-row nozzle arrangement. From bottom to top, this is the one Magnetic block 12, a sealing plate 11, two combs 4 and 4a, with the tongues 3 formed anchor elements, a sealing plate 10 and the nozzle plate 2 with the Nozzles 1 arranged in two rows are shown. The tongues provided for driving of the two combs 4 and 4a point with their free ends towards one another. It is appropriate the nozzles of the two rows of nozzles, as well as the tongues assigned to them arrange half a division offset to each other. The ones in the magnet block 12 further parts of the electromagnetic drives, namely the yoke parts 5 and the coils 6 can, as has been described with reference to FIG. 2, arranged in a staggered manner be.
Die Herstellung der einzelnen Teile des Schreibkopfes ist aufwandsarm. Vor allem entfallen die nur schwierig zu beherrschenden Bearbeitungsvorgänge für piezokeramische Werkstoffe. Sämtliche Einzelteile lassen sich als Präzisionsteile mit vollkommen planen Flächen erstellen, was den Zusammenbau der einzelnen scheibenförmigen Teile erheblich erleichtert. Die mit der erfindungsgemäßen Anordnung erreichbare Teilung der Düsen liegt in Größenordnungen von 0,25mm bis 0,lmm und unterschreitet die bei Verwendung von Piezokämmen erreichbaren Werte deutlich.The manufacture of the individual parts of the write head is easy. Above all, the difficult-to-master machining processes for piezoceramic materials. All individual parts can be used as precision parts create with perfectly flat surfaces what the Assembling the individual disc-shaped parts made much easier. The with the invention Arrangement achievable division of the nozzles is in the order of magnitude from 0.25mm to 0.1 mm and clearly falls below the values that can be achieved when using piezo combs.
6 Patentansprüche 3 Figuren6 claims 3 figures
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE19823245283 DE3245283A1 (en) | 1982-12-07 | 1982-12-07 | Arrangement for expelling liquid droplets |
Applications Claiming Priority (1)
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DE19823245283 DE3245283A1 (en) | 1982-12-07 | 1982-12-07 | Arrangement for expelling liquid droplets |
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DE3245283A1 true DE3245283A1 (en) | 1984-06-07 |
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DE19823245283 Withdrawn DE3245283A1 (en) | 1982-12-07 | 1982-12-07 | Arrangement for expelling liquid droplets |
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1982
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