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EP0314851B1 - Needle matrix printer with adjustable print needle guide - Google Patents

Needle matrix printer with adjustable print needle guide Download PDF

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Publication number
EP0314851B1
EP0314851B1 EP87730139A EP87730139A EP0314851B1 EP 0314851 B1 EP0314851 B1 EP 0314851B1 EP 87730139 A EP87730139 A EP 87730139A EP 87730139 A EP87730139 A EP 87730139A EP 0314851 B1 EP0314851 B1 EP 0314851B1
Authority
EP
European Patent Office
Prior art keywords
print
wire
needle
needle guide
adjustable
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.)
Expired - Lifetime
Application number
EP87730139A
Other languages
German (de)
French (fr)
Other versions
EP0314851A1 (en
Inventor
Clemens Dipl.-Ing.(Fh) Kaufmann
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Priority to DE8787730139T priority Critical patent/DE3776698D1/en
Priority to EP87730139A priority patent/EP0314851B1/en
Priority to AT87730139T priority patent/ATE72545T1/en
Priority to US07/262,889 priority patent/US4900167A/en
Priority to JP63279211A priority patent/JPH01154764A/en
Publication of EP0314851A1 publication Critical patent/EP0314851A1/en
Application granted granted Critical
Publication of EP0314851B1 publication Critical patent/EP0314851B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface
    • 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
    • B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
    • B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
    • B41J2/235—Print head assemblies
    • B41J2/25—Print wires
    • B41J2/255—Arrangement of the print ends of the wires
    • 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
    • B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
    • B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
    • B41J2/235—Print head assemblies
    • B41J2/265—Guides for print wires

Definitions

  • Shorter needles mean a shorter housing for the needle guide assembly. However, this connects a shorter lever arm to which the needle guide carrier is attached. The shorter lever arm means a reduction in the radius, i.e. a greater curvature of the arch on which the needle guide stone can be moved back and forth. At the same time, however, it must be taken into account that shorter needles are stiffer than longer ones and are therefore more difficult to bend, which in turn means that a greater driving force has to be applied by the needle drive assembly because of increased friction in the guide levels.
  • the invention has for its object to provide a matrix needle printhead with adjustable needle guide, which is suitable for shorter, more rigid bending needles.
  • the object is achieved according to the invention with the matrix needle printhead mentioned at the outset in that the electric lifting magnet is arranged with its coil center axis perpendicular to the center axis of the matrix needle printhead running in the printing direction of the printing needles, and in that in a guide movable magnetic core is connected to a parallel adjustable needle guide carrier.
  • This solution first eliminates the disadvantageous consequences of the pivoting movement of the needle guide block, which can only be moved perpendicularly to the central axis of the matrix print head, for short as well as long print needles. Then, by attaching the needle guide carrier to the magnetic core, the needle guide carrier is removed from the magnetic flux circuit of the electric lifting magnet, whereby the magnetic flux circuit becomes shorter and better energy utilization takes place.
  • the separation of the needle guide carrier from the magnetic flux circuit means that it no longer has to be made from heavy iron materials, but from light materials, so that weight can be saved for this moving part.
  • the electric lifting magnet 9 has an adjusting screw 12, by means of which the magnetic core 13 can be set to a favorable working air gap 14 or readjusted after assembly.
  • the pressure needle guide 2 is attached to a needle guide carrier 15 to be described in more detail. This pressure needle guide 2 is moved back and forth by the electric lifting magnet 9 between two fixed positions.

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  • Impact Printers (AREA)
  • Common Mechanisms (AREA)

Abstract

In the print head (1) of a needle matrix printer with an adjustable print needle guide (2), there is provided a print needle drive module (3) and a print needle guide module (5) facing a platen (4), the guide module possessing a housing (8) which guides the print needles (7). In the region of the print needle guide module (5) there is a lifting electromagnet (9) with an adjustment screw (12) for the magnet core (13), which together with a needle guide support (15) forms an adjustable working air gap (14). In this way, the needle guide support (15) can be moved backwards and forwards between two positions which can be permanently set. <??>In order to obtain print needle guidance which operates precisely and is also suitable for shorter, more bend-resistant print needles, it is proposed that the lifting electromagnet (9) is arranged with its central coil axis (16) vertical to the central axis (17) of the print head (1) of a needle matrix printer and running in the printing direction of the print needles (7) and that the magnet core (13) movable in a guide is connected to a needle guide support (15) capable of parallel adjustment. <IMAGE>

Description

Die Erfindung betrifft einen Matrixnadeldruckkopf mit verstellbarer Drucknadelführung, wobei eine Drucknadelantriebsbaugruppe und eine einem Druckwiderlager zugewandte Drucknadelführungsbaugruppe mit einem die Drucknadeln führenden Gehäuse vorgesehen sind und im Bereich der Drucknadelführungsbaugruppe ein Elektrohubmagnet mit Einstellschraube für den Magnetkern, der eine Einheit zusammen mit einem Nadelführungsträger bildet, auf einen Arbeitsluftspalt einstellbar und damit der Nadelführungsträger zwischen zwei fest einstellbaren Positionen hin- und herbewegbar ist.The invention relates to a matrix needle print head with an adjustable pressure needle guide, wherein a pressure needle drive assembly and a pressure needle guide assembly facing a pressure abutment are provided with a housing guiding the pressure needles, and in the area of the pressure needle guide assembly an electric lifting magnet with adjusting screw for the magnetic core, which forms a unit together with a needle guide carrier, on one Working air gap adjustable and thus the needle guide carrier between two fixed positions can be moved back and forth.

Ein solcher Matrixdruckkopf ist aus der DE-A-34 12 856 bekannt, Der Nadelführungsträger ist allerdings durch einen langgestreckten Führungshebel gebildet, der um ein rückwärtiges spielfreies Gelenk schwenkbar ist und somit bewegt sich der Führungshebel mit seinem Ende auf einem Kreisbogen. Die äußeren Drucknadeln auf dem Kreisbogen müßten demzufolge jeweils längere, d.h. unterschiedliche Hubwege zurücklegen, was jedoch wegen der unter sich gleichen Drucknadelantriebe nicht möglich und auch wenig sinnvoll ist. Zudem unterliegen die äußeren auf dem Bewegungsbogen liegenden Drucknadeln noch der stärkeren Wölbung eines im Querschnitt kreisförmigen Druckwiderlagers, so daß auch dort Hubweg fehlt, um für alle Drucknadeln eine gleichgrpße Aufschlagkraft zu erreichen. Eine solche gleichgroße Aufschlagkraft wäre besonders für einen Aufzeichnungsträger und mehrere Durchschläge wünschenswert.Such a matrix print head is known from DE-A-34 12 856, However, the needle guide carrier is formed by an elongated guide lever, which can be pivoted about a rear play-free joint, and thus the end of the guide lever moves on an arc. The outer pressure needles on the circular arc would therefore each have to travel longer, that is to say different stroke paths, which, however, is not possible and is not very useful because of the pressure needle drives that are the same among themselves. In addition, the outer pressure needles lying on the movement arc are still subject to the greater curvature of a pressure abutment which is circular in cross section, so that there is also no travel path in order to achieve an equally high impact force for all pressure needles. Such an impact force of the same size would be particularly desirable for one record carrier and several copies.

Die bekannte Lösung macht im übrigen von einer Einstellschraube keinen Gebrauch. Eine solche Einstellschraube ist jedoch z. B. aus der nachstehend genannten DE-A1-43 12 854 bekannt.The known solution makes no use of an adjusting screw. Such an adjusting screw is, for. B. known from DE-A1-43 12 854 mentioned below.

Derartige Matrixnadeldruckköpfe mit verstellbarer Drucknadelführung dienen dem Erzeugen von Schönschrift in unterschiedlichen Stufen, so z.B. dem Erzeugen von NLQ-Schrift (near letter quality) und auch von LQ-Schrift (letter quality = Korrespondenzschrift). Hierbei werden nach einem Druckpaß, d.h. nach dem Durchlaufen einer Schreibzeile in einem zweiten Druckpaß oder in einem auf den ersten Druckpaß folgenden Rückdruckpaß die Drucknadelführung um weniger als einen Nadelabstand (ca. 0,3 mm) verstellt, wodurch die Nadelabstandslücken durch weitere Druckpunkte ausgefüllt werden. Das Verstellen der Drucknadelführung bedarf daher einer sehr hohen Genauigkeit zwischen zwei feststehenden Positionen (Anschlägen), wobei die Drucknadeln in einem Nadelführungsstein geführt sind, der aus einem ähnlichen Werkstoff wie Lagersteine für Kleinuhren hergestellt ist.Such matrix needle printheads with an adjustable needle guide are used to generate nice text in different stages, e.g. the generation of NLQ font (near letter quality) and also of LQ font (letter quality = correspondence font). Here, after a print pass, i.e. after passing through a writing line in a second print pass or in a back pressure pass following the first print pass, the print needle guide is adjusted by less than a needle spacing (approx. 0.3 mm), whereby the needle spacing gaps are filled by further pressure points. The adjustment of the pressure needle guide therefore requires a very high degree of accuracy between two fixed positions (stops), the pressure needles being guided in a needle guide stone which is made of a similar material to that of jewels for small watches.

Es ist ferner bekannt (DE-OS 34 12 854; DE-OS 34 03 795; DE OS 34 12 855; US-Patent 4,640,623), bei sehr langen Drucknadeln, die ein sehr langes, die Drucknadeln führendes Gehäuse benötigen, innerhalb oder außerhalb dieses Gehäuses einen Elektrohubmagneten anzuordnen, der etwa, längs der Drucknadeln und zu diesen etwa parallel verläuft.It is also known (DE-OS 34 12 854; DE-OS 34 03 795; DE OS 34 12 855; US Patent 4,640,623), with very long printing needles that require a very long housing that guides the printing needles, inside or outside this housing to arrange an electric lifting magnet which runs approximately along the printing needles and approximately parallel to these.

In diesem Fall befindet sich die Drucknadelführung und dieser Nadelführungsstein an einem relativ langen Hebelarm, der meist im Bereich der Drucknadelantriebsbaugruppe um ein Gelenk schwenkbar gelagert ist. DieIn this case, the pressure needle guide and this needle guide block are located on a relatively long lever arm, which is usually pivoted about a joint in the area of the pressure needle drive assembly. The

Bewegung des Nadelführungssteins auf einem Bogen mit dem Radius gleich der Länge des Hebelarmes ist zwar nachteilig, weil sich in einem gewissen Verstellbereich die Sehnenhöhe des Bogens bemerkbar macht. Jedoch wurde bisher dieser Nachteil als zulässig betrachtet. Insoweit haben sich derartige verstellbare Drucknadelführungen in Tausenden von Matrixnadeldruckköpfen bewährt.Movement of the needle guide block on an arch with a radius equal to the length of the lever arm is disadvantageous because the bow height of the arch is noticeable in a certain adjustment range. However, this disadvantage has so far been considered acceptable. To this extent, such adjustable print needle guides have proven themselves in thousands of matrix needle print heads.

Sehr lange Drucknadeln haben sich jedoch in der Zwischenzeit als äußerst nachteilig aus folgenden Gründen erwiesen: Die größere Masse längerer Drucknadeln behindert die Druckfrequenz, d.h. eine kleinere Masse macht eine Erhöhung der Druckfrequenz möglich. Mit kleinerer Masse sind die gewünschten kürzeren Beschleunigungszeiten zu erreichen. Kürzere Drucknadeln bedeuten jedoch ein kürzeres Gehäuse der Drucknadelführungsbaugruppe. Damit ist jedoch ein kürzerer Hebelarm verbunden, an dem der Nadelführungsträger befestigt ist. Der kürzere Hebelarm bedeutet eine Verminderung des Radius', d.h. eine stärkere Krümmung des Bogens, auf dem der Nadelführungsstein hin- und herbewegbar ist. Gleichzeitig muß aber berücksichtigt werden, daß kürzere Drucknadeln steifer sind als längere und daher schwerer gebogen werden können, was wiederum bedeutet, daß eine größere Antriebskraft wegen erhöhter Reibung in den Führungsebenen durch die Drucknadelantriebsbaugruppe aufgebracht werden muß.In the meantime, however, very long printing needles have proven to be extremely disadvantageous for the following reasons: The larger mass of longer printing needles hinders the printing frequency, i.e. a smaller mass makes it possible to increase the pressure frequency. The desired shorter acceleration times can be achieved with a smaller mass. Shorter needles, however, mean a shorter housing for the needle guide assembly. However, this connects a shorter lever arm to which the needle guide carrier is attached. The shorter lever arm means a reduction in the radius, i.e. a greater curvature of the arch on which the needle guide stone can be moved back and forth. At the same time, however, it must be taken into account that shorter needles are stiffer than longer ones and are therefore more difficult to bend, which in turn means that a greater driving force has to be applied by the needle drive assembly because of increased friction in the guide levels.

Der Erfindung liegt die Aufgabe zugrunde, einen Matrixnadeldruckkopf mit verstellbarer Drucknadelführung zu schaffen, die für kürzere, biegungssteifere Drucknadeln geeignet ist.The invention has for its object to provide a matrix needle printhead with adjustable needle guide, which is suitable for shorter, more rigid bending needles.

Die gestellte Aufgabe wird bei dem eingangs bezeichneten Matrixnadeldruckkopf erfindungsgemäß dadurch gelöst, daß der Elektrohubmagnet mit seiner Spulenmittelachse senkrecht zur in Druckrichtung der Drucknadeln verlaufenden Mittelachse des Matrixnadeldruckkopfes angeordnet ist und daß der in einer Führung bewegbare Magnetkern mit einem parallel verstellbaren Nadelführungsträger verbunden ist. Diese Lösung beseitigt zunächst bei kurzen wie auch bei langen Drucknadeln die nachteiligen Folgen der Schwenkbewegung des Nadelführungssteins, der nur noch senkrecht zur Mittelachse des Matrixdruckkopfes bewegt werden kann. Sodann wird durch die Befestigung des Nadelführungsträgers am Magnetkern der Nadelführungsträger aus dem Magnetflußkreis des Elektrohubmagnets herausgenommen, wodurch der Magnetflußkreis kürzer wird und eine bessere Energieausnutzung stattfindet. Die Ausgliederung des Nadelführungsträgers aus dem Magnetflußkreis bedeutet gleichzeitig, daß dieser nicht mehr aus schweren Eisenwerkstoffen hergestellt werden muß, sondern aus leichten Werkstoffen, so daß für diesen bewegten Teil entscheidend an Gewicht gespart werden kann.The object is achieved according to the invention with the matrix needle printhead mentioned at the outset in that the electric lifting magnet is arranged with its coil center axis perpendicular to the center axis of the matrix needle printhead running in the printing direction of the printing needles, and in that in a guide movable magnetic core is connected to a parallel adjustable needle guide carrier. This solution first eliminates the disadvantageous consequences of the pivoting movement of the needle guide block, which can only be moved perpendicularly to the central axis of the matrix print head, for short as well as long print needles. Then, by attaching the needle guide carrier to the magnetic core, the needle guide carrier is removed from the magnetic flux circuit of the electric lifting magnet, whereby the magnetic flux circuit becomes shorter and better energy utilization takes place. The separation of the needle guide carrier from the magnetic flux circuit means that it no longer has to be made from heavy iron materials, but from light materials, so that weight can be saved for this moving part.

Die Führung des bewegbaren Magnetkerns kann dadurch besonders vorteilhaft, weil einfach, verwirklicht werden, indem der Elektrohubmagnet eine Kernbuchse aufweist, in der der mit dem Nadelführungsträger verbundene Magnetkern geführt ist.The guiding of the movable magnetic core can be particularly advantageous because simple, can be realized in that the electric lifting magnet has a core socket in which the magnetic core connected to the needle guide carrier is guided.

Eine zusätzliche Verbesserung der Magnetflußverhältnisse tritt dadurch ein, daß an der zur Mittelachse abgewandten Seite der Kernbuchse eine Gewindemutter angeordnet ist, in der eine solche Einstellschraube vorgesehen ist, die mit dem Magnetkern innerhalb des Elektrohubmagnets den einstellbaren Arbeitsluftspalt bildet. Diese Lösung bedeutet einen geringeren Streufluß des Elektromagneten und damit eine höhere Anzugskraft im Bereich des Luftspalts. Da die Einstellschraube in den Magnetflußkreis als Magnetfluß führendes Teil integriert wurde, entfällt eine separate Einstellschraube gegenüber bisher.An additional improvement in the magnetic flux conditions occurs in that a threaded nut is arranged on the side of the core bushing facing away from the central axis, in which such an adjusting screw is provided which forms the adjustable working air gap with the magnetic core within the electric lifting magnet. This solution means a lower leakage flux of the electromagnet and therefore a higher attraction force in the area of the air gap. Since the adjusting screw has been integrated into the magnetic flux circuit as a part guiding the magnetic flux, a separate adjusting screw has been dispensed with in comparison with previously.

Vorteilhafterweise werden die zwei fest einstellbaren Positionen des Nadelführungsträgers dadurch gewährleistet, daß zwischen dem Nadelführungsträger und dem am Gehäuse der Drucknadelführungsbaugruppe festen Elektrohubmagnet eine gebogene Flachfeder angeordnet ist.The two permanently adjustable positions of the needle guide carrier are advantageously ensured by the fact that between the needle guide carrier and that on the housing of the pressure needle guide assembly fixed electric lifting magnet a curved flat spring is arranged.

Die Bauweise der verstellbaren Drucknadelführung wird noch dadurch verbessert, daß der Nadelführungsträger einen im wesentlichen winkelförmigen Bauteil bildet, an dessen erstem Schenkel der Magnetkern und an dessen zweitem Schenkel der Nadelführungsstein befestigt sind.The design of the adjustable pressure needle guide is further improved in that the needle guide carrier forms an essentially angular component, on the first leg of which the magnetic core and on the second leg of the needle guide block are attached.

Die herausgestellte Parallelführung des Nadelführungsträgers wird außerdem ohne großen Aufwand dadurch gebildet, daß der winkelförmige Bauteil mit dem zweiten Schenkel, an dem der Nadelführungsstein befestigt ist, in einer Führung, die das Gehäuse der Drucknadelführungsbaugruppe bildet, seitlich gelagert ist.The exposed parallel guide of the needle guide carrier is also formed without great effort in that the angular component with the second leg, to which the needle guide block is attached, is mounted laterally in a guide which forms the housing of the pressure needle guide assembly.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung schematisch dargestellt, das im folgenden näher beschrieben wird. Es zeigen:

Fig. 1
einen senkrechten Querschnitt durch den Matrixnadeldruckkopf und
Fig. 2
eine Vorderansicht des Matrixnadeldruckkopfes nach Fig. 1.
In the drawing, an embodiment of the invention is shown schematically, which is described in more detail below. Show it:
Fig. 1
a vertical cross section through the matrix needle printhead and
Fig. 2
2 shows a front view of the matrix needle print head according to FIG. 1.

Der Matixnadeldruckkopf 1 ist mit einer verstellbaren Drucknadelführung 2 ausgerüstet. Er besitzt einen grundsätzlichen Aufbau, der eine Drucknadelantriebsbaugruppe 3 (nur angedeutet) und eine einem Druckwiderlager 4 zugewandte Drucknadelführungsbaugruppe 5 für eine Spalte 6 bildenden Drucknadeln 7 angehören. Die Drucknadeln 7, die z.B. eine Spalte 6 von neun oder zwölf Drucknadeln 7 bilden, werden in einem Gehäuse 8 geführt. Im Bereich der Drucknadelführungsbaugruppe 5 ist für die verstellbare Drucknadelführung 2 ein Elektrohubmagnet 9 angeordnet.The matrix needle printhead 1 is equipped with an adjustable needle guide 2. It has a basic structure, which includes a printing needle drive assembly 3 (only indicated) and a printing needle guide assembly 5 facing a pressure abutment 4 for a printing needle 7 forming a column 6. The printing needles 7, e.g. form a column 6 of nine or twelve printing needles 7 are guided in a housing 8. An electric lifting magnet 9 is arranged in the area of the printing needle guide assembly 5 for the adjustable printing needle guide 2.

Die Drucknadelführungsbaugruppe 5 ist unter Zwischenfügung von Einstellblechen 10 mittels Schrauben 11 auf eine Platte 3a der Drucknadelantriebsbaugruppe 3 geschraubt.The pressure needle guide assembly 5 is screwed onto a plate 3a of the pressure needle drive assembly 3 by means of screws 11 with the interposition of adjusting plates 10.

Der Elektrohubmagnet 9 weist eine Einstellschraube 12 auf, mittels deren der Magnetkern 13 auf einen günstigen Arbeitsluftspalt 14 eingestellt bzw. nach der Montage nachgestellt werden kann. Die Drucknadelführung 2 ist an einem noch näher zu beschreibenden Nadelführungsträger 15 befestigt. Diese Drucknadelführung 2 wird durch den Elektrohubmagnet 9 zwischen zwei fest bestimmten Positionen hin- und herbewegt.The electric lifting magnet 9 has an adjusting screw 12, by means of which the magnetic core 13 can be set to a favorable working air gap 14 or readjusted after assembly. The pressure needle guide 2 is attached to a needle guide carrier 15 to be described in more detail. This pressure needle guide 2 is moved back and forth by the electric lifting magnet 9 between two fixed positions.

Insbesondere für relativ kurze Drucknadeln 7 (z.B. 27 mm lang) ist der Elektrohubmagnet 9 mit seiner Spulenmittelachse 16 senkrecht zur Mittelachse 17 des Matrixnadeldruckkopfes 1 angeordnet, wobei die Drucknadeln 7 im wesentlichen in Richtung dieser Mittelachse 17 bzw. parallel zur Mittelachse 17 drucken. Der geführte Magnetkern 13 verstellt in der Richtung der Spulenmittelachse 16 den Nadelführungsträger 15 mit der Drucknadelführung 2 parallel in der Weise, daß die Drucknadelführung 2 senkrecht und nicht bogenförmig zur Mittelachse 17 verstellt wird. Hierzu besitzt der Elektrohubmagnet 9 eine Kernbuchse 18, in der der mit dem Nadelführungsträger 15 verbundene Magnetkern 13 gleitend geführt ist. An der am Magnetkern 13 abgewandten Seite ist an dem Elektrohubmagnet 9 eine Gewindemutter 19 angeordnet, in der eine solche Einstellschraube 12 vorgesehen ist, die mit dem Magnetkern 13 etwa in der Mitte der Höhe des Elektrohubmagnets 9 den Arbeitsluftspalt 14 bildet. Diese Einbeziehung des Arbeitsluftspaltes 14 in die Kernbuchse 18 erspart Streuflüsse, so daß mit weniger Energiezufuhr an den Elektroanschlüssen 20 und 21 ausgekommen wird.Particularly for relatively short printing needles 7 (e.g. 27 mm long), the electric lifting magnet 9 is arranged with its central coil axis 16 perpendicular to the central axis 17 of the matrix needle print head 1, the printing needles 7 printing essentially in the direction of this central axis 17 or parallel to the central axis 17. The guided magnetic core 13 adjusts the needle guide carrier 15 with the printing needle guide 2 parallel in the direction of the coil center axis 16 in such a way that the printing needle guide 2 is adjusted perpendicularly and not in an arc shape to the central axis 17. For this purpose, the electric lifting magnet 9 has a core bushing 18 in which the magnetic core 13 connected to the needle guide carrier 15 is slidably guided. On the side facing away from the magnetic core 13, a threaded nut 19 is arranged on the electric lifting magnet 9, in which such an adjusting screw 12 is provided, which forms the working air gap 14 with the magnetic core 13 approximately in the middle of the height of the electric lifting magnet 9. This inclusion of the working air gap 14 in the core socket 18 saves stray fluxes, so that less energy is supplied to the electrical connections 20 and 21.

Gleichzeitig wird aber bei einer Spannung von 36 V an den Elektroanschlüssen 20 und 21 nur eine Erregerspule 22 benötigt, die bei relativ kurzen Drucknadeln 7 ein sehr kurzes Gehäuse 8 der Drucknadelführungsbaugruppe 5 ergibt. Mit anderen Worten ausgedrückt besitzt die Erregerspule 22 einen äußerst kleinen Durchmesser (maximal 12 mm).At the same time, however, at a voltage of 36 V at the electrical connections 20 and 21, only one excitation coil 22 is required, which results in a very short housing 8 of the pressure needle guide assembly 5 with relatively short pressure needles 7. In other words, the excitation coil 22 has an extremely small diameter (maximum 12 mm).

Der Nadelführungsträger 15 wird mittels einer gebogenen Flachfeder 23, die gegen den Rahmen 24 für die Erregerspule 22 anliegt, auf dem Abstand gehalten, der dem Arbeitsluftspalt 14 bzw. dem Verschiebeabstand für die Drucknadelführung 2 entspricht.The needle guide carrier 15 is held at a distance which corresponds to the working air gap 14 or the displacement distance for the pressure needle guide 2 by means of a curved flat spring 23 which bears against the frame 24 for the excitation coil 22.

Der Nadelführungsträger 15 bildet einen im wesentlichen winkelförmiges Bauteil mit einem ersten Schenkel 15a, an dem der Magnetkern 13 mittels einer Nietverbindung 25 befestigt ist und einen zweiten Schenkel 15b, in dem ein Nadelführungsstein 26 befestigt ist. Dieser zweite Schenkel 15b ist an dem Gehäuse 8 der Drucknadelführungsbaugruppe 5 in einer jeweils seitlich gebildeten Führung 27 bzw. 28 gelagert. Zwischen den Führungen 27 und 28 kann der zweite Schenkel 15b im Maß des Arbeitsluftspaltes 14 auf-und abbewegt werden, je nachdem, wie die Einstellschraube 12 eingestellt ist.The needle guide carrier 15 forms an essentially angular component with a first leg 15a, to which the magnetic core 13 is fastened by means of a rivet connection 25 and a second leg 15b, in which a needle guide block 26 is fastened. This second leg 15b is mounted on the housing 8 of the pressure needle guide assembly 5 in a laterally formed guide 27 and 28, respectively. Between the guides 27 and 28, the second leg 15b can be moved up and down in the dimension of the working air gap 14, depending on how the adjusting screw 12 is set.

Claims (6)

  1. A wire matrix print head (1) with adjustable print wire guide (2), in which print wire drive components (3) and print wire guidance components (5) facing a print counter-surface (4) are provided with a housing (8) guiding the print wires (7) and a lifting electromagnet (9) with adjusting screw (12) for the magnet core (13) in the region of the print wire guidance components (5), which magnet forms a unit together with a wire guide support (15), is adjustable on an operating air gap (14) and the wire guide support (15) can be moved therewith back and forth between two fixedly adjustable positions,
    characterised in that
    the lifting electromagnet (9) is arranged with its coil centre line (16) perpendicular to the centre line (17) of the wire matrix print head (1), which extends in the direction of printing of the print wires (7), and that the magnet core (13) which is movable in a guide is connected to a wire guide support (15) which is adjustable parallel to the coil centre line (16).
  2. A wire matrix print head according to Claim 1,
    characterised in that
    the lifting electromagnet (9) has a core bushing (18) in which the magnet core (13) connected to the wire guide support (15) is guided.
  3. A wire matrix print head according to Claims 1 or 2,
    characterised in that
    a threaded nut (19) is disposed on the side of the core bushing (18) remote from the centre line (17), in which nut an adjusting screw (12) is provided which forms the adjustable operating air gap (14) with the magnet core (13) within the lifting electromagnet (9).
  4. A wire matrix print head according to one or more of Claims 1 to 3,
    characterised in that
    a curved leaf spring (23) is disposed between the wire guide support (15) and the lifting electromagnet (9) which is secured to the housing (8) of the print wire guidance components (5).
  5. A wire matrix print head according to Claims 1 to 4,
    characterised in that
    the wire guide support (15) forms a substantially angular component, to the first arm (15a) of which the magnet core (13) is attached and to the second arm (15b) of which the wire guidance block (26) is attached.
  6. A wire matrix print head according to Claim 5,
    characterised in that
    the angular component is mounted at the side, by the second arm (15b) to which the wire guidance block (26) is attached, in a guide (27, 28) which forms the housing (8) of the print wire guidance components (5).
EP87730139A 1987-11-06 1987-11-06 Needle matrix printer with adjustable print needle guide Expired - Lifetime EP0314851B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE8787730139T DE3776698D1 (en) 1987-11-06 1987-11-06 MATRIX NEEDLE PRINTER WITH ADJUSTABLE PRINT NEEDLE GUIDE.
EP87730139A EP0314851B1 (en) 1987-11-06 1987-11-06 Needle matrix printer with adjustable print needle guide
AT87730139T ATE72545T1 (en) 1987-11-06 1987-11-06 DOTS MATRIX PRINTER WITH ADJUSTABLE PIN GUIDE.
US07/262,889 US4900167A (en) 1987-11-06 1988-10-25 Matrix pin printer with adjustable print pin guide
JP63279211A JPH01154764A (en) 1987-11-06 1988-11-04 Matrix needle printing head with adjustable printing needle guide member

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87730139A EP0314851B1 (en) 1987-11-06 1987-11-06 Needle matrix printer with adjustable print needle guide

Publications (2)

Publication Number Publication Date
EP0314851A1 EP0314851A1 (en) 1989-05-10
EP0314851B1 true EP0314851B1 (en) 1992-02-12

Family

ID=8198373

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87730139A Expired - Lifetime EP0314851B1 (en) 1987-11-06 1987-11-06 Needle matrix printer with adjustable print needle guide

Country Status (5)

Country Link
US (1) US4900167A (en)
EP (1) EP0314851B1 (en)
JP (1) JPH01154764A (en)
AT (1) ATE72545T1 (en)
DE (1) DE3776698D1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010025175A1 (en) 2010-06-25 2011-12-29 Pierburg Gmbh Infinitely adjustable pressure control valve

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE224815C (en) *
US3882985A (en) * 1973-07-23 1975-05-13 Ncr Co Tiltable matrix print head to permit viewing of the characters
DD112695A1 (en) * 1974-07-09 1975-04-20
US4284363A (en) * 1979-07-30 1981-08-18 International Business Machines Corp. Data matrix print head
US4459051A (en) * 1979-08-15 1984-07-10 Canon Kabushiki Kaisha Matrix printer
DE3403795C2 (en) * 1984-02-01 1986-12-18 Mannesmann AG, 4000 Düsseldorf Matrix needle printhead with a mouthpiece that can be adjusted in the direction of the columns
US4640633A (en) * 1984-03-22 1987-02-03 Dh Technology, Inc. High-speed wire print head with wire print position shift apparatus
DE3412856A1 (en) * 1984-04-03 1985-10-03 Mannesmann AG, 4000 Düsseldorf MATRIX PRINT HEAD WITH ADJUSTABLE PRINT NEEDLE GUIDE
US4605323A (en) * 1985-07-02 1986-08-12 At&T Teletype Corporation Dual quality wire matrix print head

Also Published As

Publication number Publication date
ATE72545T1 (en) 1992-02-15
DE3776698D1 (en) 1992-03-26
US4900167A (en) 1990-02-13
JPH01154764A (en) 1989-06-16
EP0314851A1 (en) 1989-05-10

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