EP0112275B1 - Needle printing head for a matrix printer - Google Patents

Needle printing head for a matrix printer Download PDF

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Publication number
EP0112275B1
EP0112275B1 EP83730097A EP83730097A EP0112275B1 EP 0112275 B1 EP0112275 B1 EP 0112275B1 EP 83730097 A EP83730097 A EP 83730097A EP 83730097 A EP83730097 A EP 83730097A EP 0112275 B1 EP0112275 B1 EP 0112275B1
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EP
European Patent Office
Prior art keywords
magnet
needle
print head
head according
shaped
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
Application number
EP83730097A
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German (de)
French (fr)
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EP0112275A1 (en
Inventor
Bernd Dipl.-Ing. Gugel
Harald Dipl.-Ing. Niebel
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Vodafone GmbH
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Mannesmann AG
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Publication of EP0112275A1 publication Critical patent/EP0112275A1/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
    • B41J2/22—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
    • B41J2/27—Actuators for print wires
    • B41J2/28—Actuators for print wires of spring charge type, i.e. with mechanical power under electro-magnetic control

Definitions

  • the invention relates to a dot matrix printhead for matrix printers with a bobbin which has spaced apart magnetic yokes, each of which is associated with an electromagnetic coil surrounding a magnetic yoke and a magnet armature attached to a resilient element, which is connected to the rear end of a printing needle, with its front end Pressure points can be generated on a record carrier by selective energization of the electromagnetic coils, and with a disc-shaped permanent magnet provided in the core region of the coil carrier.
  • Such dot matrix print heads achieve printing speeds which are the same as those of slow line printers (600 characters per second) and are known to be considerably less complex than such line printers.
  • needle print heads are inferior to line printers in terms of the service life, which is measured in millions of characters. Efforts are therefore being made to improve the relatively inexpensive dot matrix print heads for matrix printers in order to obtain a longer service life.
  • the dot matrix printhead for matrix printers represents an object that has to be accelerated from zero speed to a constant speed and then decelerated again.
  • the known object is also designed with respect to the magnetic circuit in such a way that the pole faces of two pole pieces lie in mutually perpendicular planes and are arranged closely adjacent to one another, that the armature is provided with corresponding surfaces parallel to the pole faces, and that a pair of crossed bending members is provided to form a pivot bearing for the armature and the pivot axis lies approximately in the plane of the pole face of the electromagnet, the armature being forced to move along a path which intersects the plane of the pole face of the electromagnet, as a result of which the permanent magnet contacts the armature in contact the pole face of the electromagnet and at a short distance from the permanent magnet pole piece.
  • Such a magnet system may have certain advantages, but it intentionally contains several air gaps in the electromagnet.
  • the training of the individual links is still very expensive, such as. B. training with crossed bending members to form a pivot bearing for the anchor.
  • the invention has for its object to propose an even lighter needle print head for higher speeds combined with simpler manufacturing technology and high electrical efficiency.
  • the coil carrier forms magnetic yokes in the number of printing lines even on the outer circumference or edge, that the magnetic yokes and the electromagnetic coils used form a flat surface with their respective outer sides with the disc-shaped permanent magnets arranged in an interior of the coil carrier that a disc-shaped, magnetizable cover, which is placed on the common flat surface and covers the electromagnetic coils, is provided, and that the magnet armature is opposite each for a printing needle on the cover of the electromagnetic coil.
  • the better utilization of the magnetic fluxes is achieved in particular in that interruptions of the magnetic flux in the form of gaps filled with non-magnetizable material are provided in the disc-shaped, magnetizable cover with respect to the magnet armature.
  • the gaps therefore limit leakage flux losses.
  • Another measure to steer the magnetic fluxes into desired paths is that the magnetic armatures are arranged on the disk-shaped cover, covering at least the intermediate spaces.
  • the non-magnetizable material in the interstices advantageously consists of solder or cast resin.
  • the resilient element connected to the magnet armature is under bending prestress.
  • Such an arrangement serves for easy adjustability during assembly, in which the basis for the proper functioning of the individual parts is created.
  • the bending pretension is also a means of achieving a uniform firing of the individual needles.
  • the coil carrier consist of a thin-walled base body produced by shape stamping and section-wise bending, in which the yoke legs are each below the bottom surface bent and bent up to a "U" with unevenly long yoke legs, the outer of which protrude above the floor surface.
  • Such a bobbin can also be used for a non-circular arrangement of the printing needles or printing hammers. It is then provided for this that the coil carrier, the permanent magnet or the disk-shaped cover are each rectangular or round.
  • a simplification compared to the prior art is achieved in that the side walls of the magnet armature are made of a material of sheet thickness, which is shaped into a rigid cross-section with a triangular plan.
  • the needle printhead according to the invention is formed from merging functions of easier assembly, the stray fluxes to be avoided or their utilization and to save weight to the extent that the coil carrier, the permanent magnet and the disk-shaped cover are connected to one another in areas of flat surfaces touching one another. This results in a particularly compact design with the functional advantages mentioned.
  • the needle print head has a coil carrier 1 which is further shaped on the outer circumference 2 to form magnetic yokes 3, such an approximately shell-shaped coil carrier 1 being able to be produced from soft iron sheet by pulling or pressing and punching and forming an interior 1 a.
  • the magnetic yokes 3 protrude upward as approximately rectangular yoke legs 3a (FIG. 2) and are each surrounded by the associated electromagnetic coil 4.
  • the permanent magnet 5 is located in the interior 1a.
  • the end faces 3b and the end face 5a lie on a surface 6 of the same height, which can be created by adjusting the thickness of the permanent magnet 5.
  • the screw 9 is magnetically separated from the permanent magnet 5 and from the coil carrier 1 via the insulating sleeve 10.
  • the magnetic flux 11 is created around each electromagnetic coil 4, the magnet armature 12 being pulled into the position shown in FIG. 1.
  • the pressure needle 13 is attached to the magnet armature 12. All Drucknadein 13 are guided in a mouthpiece 14 of the front housing part 8b.
  • the magnet armature 12 is itself fastened to the resilient element 15.
  • the resilient element 15 is in the drawn position so biased that when the solenoid 4 is energized, the magnetic field of the permanent magnet 5 is abruptly canceled, so that the mechanical force of the resilient element 15, the mass of the magnet armature 12 with that of the pressure needle 13 against the ( shoots not shown) shoots in direction 16, which rests on a platen (the platen usually consists of a pressure roller).
  • each magnet armature 12 is constructed from light side walls 12a and 12b and connected to the magnet plate 17.
  • the resilient element 15 is connected to the magnetic plate 17 by means of the screws 18a and 18b.
  • the resilient element 15 is lever-shaped at its free end by means of the fastening screw 19 and the adapter 20 on the cover 7.
  • the cover 7 is not in one piece, but consists of the inner plate 7a and the outer ring 7b, which form an intermediate space 21 between them.
  • This space 21 is made of non-magnetizable material, such as. B. fusible link, casting resin, adhesive, ceramic or the like.
  • the gaps 21 allow the magnetic flux to flow in precisely definable trajectories without disadvantageous stray fluxes.
  • the coil carrier 1 is produced by stamping and then bending from flat sheet metal blanks.
  • the coil carrier 1 therefore represents an economically producible, lightweight base body 1.
  • the yoke legs 3a are bent down to below the base surface 1b and bent up to form a “U” with legs of unequal length, the outer ones of which project beyond the base surface 1b.
  • the invention is not limited to a circular arrangement of the printing needles 13.
  • the arrangement of the printing needles can also be long. parallel rows take place so that the yoke legs then also form parallel rows.
  • the side walls 12a, 12b, the pressure needle 13 and the resilient element 15 are each connected to a unit by means of screwing, welding or soldering.
  • the side walls 12a, 12b are also made of a material of sheet thickness, a rigid cross section 22 having a triangular outline 23 being formed.

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Description

Die Erfindung betrifft einen Nadeldruckkopf für Matrixdrucker mit einem Spulenträger, der in Abständen verteilte Magnetjoche aufweist, denen jeweils eine ein Magnetjoch Umgebende Elektromagnetspule und ein an einem federnden Element befestigter Magnetanker zugeordnet sind, welcher mit dem hinteren Ende einer Drucknadel verbunden ist, mit deren vorderem Ende Druckpunkte auf einem Aufzeichnungsträger durch selektives Bestromen der Elektromagnetspulen erzeugbar sind, und mit im Kernbereich des Spulenträgers vorgesehenem scheibenförmigem Dauermagnet.The invention relates to a dot matrix printhead for matrix printers with a bobbin which has spaced apart magnetic yokes, each of which is associated with an electromagnetic coil surrounding a magnetic yoke and a magnet armature attached to a resilient element, which is connected to the rear end of a printing needle, with its front end Pressure points can be generated on a record carrier by selective energization of the electromagnetic coils, and with a disc-shaped permanent magnet provided in the core region of the coil carrier.

Derartige Nadeldruckköpfe erzielen Druckgeschwindigkeiten, die gleich derjenigen von langsamen Zeilendruckern sind (600 Zeichen je Sekunde) und sind bekanntlich erheblich weniger aufwendig als solche Zeilendrucker. Gegenüber Zeilendruckern sind Nadeldruckköpfe jedoch hinsichtlich der Lebensdauer, die in Millionen Zeichen gemessen wird, unterlegen. Die Bestrebungen gehen daher dahin, die relativ preiswerten Nadeldruckköpfe für Matrixdrucker zu verbessern, um eine höhere Lebensdauer zu erhalten. Andererseits stellt der Nadeldruckkopf für Matrixdrucker durch sein Gewicht ein Objekt dar, das von der Geschwindigkeit Null auf eine konstante Geschwindigkeit beschleunigt und wieder abgebremst werden muß. Zu den Problemen der Lebensdauer eines Nadeldruckkopfes kommen daher noch Antriebs-, d. h. Gewichtsprobleme, die ebenfalls einer Lösung zugeführt werden müssen.Such dot matrix print heads achieve printing speeds which are the same as those of slow line printers (600 characters per second) and are known to be considerably less complex than such line printers. However, needle print heads are inferior to line printers in terms of the service life, which is measured in millions of characters. Efforts are therefore being made to improve the relatively inexpensive dot matrix print heads for matrix printers in order to obtain a longer service life. On the other hand, due to its weight, the dot matrix printhead for matrix printers represents an object that has to be accelerated from zero speed to a constant speed and then decelerated again. In addition to the problems of the lifespan of a wire dot print head, there are also drive, ie. H. Weight problems that also need to be addressed.

Es ist bekannt (DE-OS 30 40 399), einen Hochgeschwindigkeits-Punktmatrix-Drucker mit den eingangs bezeichneten Merkmalen auszubilden, um Dauerarbeitsgeschwindigkeiten von 800 Zeichen je Sekunde zu erreichen, wobei der bekannte Druckkopf preiswerter herstellbar und leichter sein soll, da er nur etwa ein Drittel so viel Teile aufweist wie andere bekannte Druckköpfe.It is known (DE-OS 30 40 399) to design a high-speed dot matrix printer with the features mentioned in the introduction in order to achieve continuous working speeds of 800 characters per second, the known printhead should be less expensive to manufacture and lighter since it is only about a third has as many parts as other known printheads.

Der bekannte Gegenstand ist hierbei ferner dahingehend bezüglich des Magnetkreises so ausgebildet, daß die Polflächen zweier Polschuhe in zueinander senkrechten Ebenen liegen und einander eng benachbart angeordnet sind, daß der Anker mit entsprechenden, zu den Polflächen parallelen Flächen versehen ist, und daß ein Paar gekreuzter Biegeglieder zur Bildung einer Schwenklagerung für den Anker vorgesehen ist und die Schwenkachse etwa in der Ebene der Polfläche des Elektromagneten liegt, wobei dem Anker eine Bewegung entlang einer Bahn aufgezwungen ist, die die Ebene der Polfläche des Elektromagneten schneidet, wodurch der Dauermagnet den Anker in Anlage an der Polfläche des Elektromagneten und mit geringem Abstand von dem Dauermagnet-Polschuh hält.The known object is also designed with respect to the magnetic circuit in such a way that the pole faces of two pole pieces lie in mutually perpendicular planes and are arranged closely adjacent to one another, that the armature is provided with corresponding surfaces parallel to the pole faces, and that a pair of crossed bending members is provided to form a pivot bearing for the armature and the pivot axis lies approximately in the plane of the pole face of the electromagnet, the armature being forced to move along a path which intersects the plane of the pole face of the electromagnet, as a result of which the permanent magnet contacts the armature in contact the pole face of the electromagnet and at a short distance from the permanent magnet pole piece.

Ein solches Magnetsystem ist womöglich mit gewissen Vorzügen verbunden, es enthält jedoch gewollt mehrere Luftspalte des Elektromagneten. Außerdem ist die Ausbildung der einzelnen Glieder immer noch sehr aufwendig, wie z. B. die Ausbildung mit gekreuzten Biegegliedern zur Bildung einer Schwenklagerung für den Anker.Such a magnet system may have certain advantages, but it intentionally contains several air gaps in the electromagnet. In addition, the training of the individual links is still very expensive, such as. B. training with crossed bending members to form a pivot bearing for the anchor.

Der Erfindung liegt die Aufgabe zugrunde einen noch leichteren Nadeldruckkopf für höhere Geschwindigkeiten verbunden mit einfacherer Herstelltechnik und hohem elektrischem Wirkungsgrad vorzuschlagen.The invention has for its object to propose an even lighter needle print head for higher speeds combined with simpler manufacturing technology and high electrical efficiency.

Die gestellte Aufgabe wird dadurch gelöst, daß der Spulenträger selbst am äußeren Umfang oder Rand Magnetjoche in der Anzahl der Drucknadein bildet, daß die Magnetjoche und die eingesetzten Elektromagnetspulen mit dem in einem Innenraum des Spulenträgers angeordneten, scheibenförmigen Dauermagneten mit ihren jeweiligen Außenseiten eine ebene Fläche bilden, daß eine auf die gemeinsame ebene Fläche aufgesetzte, scheibenförmige, die Elektromagnetspulen überdeckende magnetisierbare Abdeckung vorgesehen ist, und daß der Magnetanker für jeweils eine Drucknadel auf der Abdeckung der Elektromagnetspule gegenüberliegt.The object is achieved in that the coil carrier forms magnetic yokes in the number of printing lines even on the outer circumference or edge, that the magnetic yokes and the electromagnetic coils used form a flat surface with their respective outer sides with the disc-shaped permanent magnets arranged in an interior of the coil carrier that a disc-shaped, magnetizable cover, which is placed on the common flat surface and covers the electromagnetic coils, is provided, and that the magnet armature is opposite each for a printing needle on the cover of the electromagnetic coil.

Diese Lösung sichert eine bessere Ausnutzung der Magnetflüsse, sei es derjenigen des Dauermagneten, sei es derjenigen des Elektromagneten. Hierbei sind insbesondere noch die Vorteile der einfacheren Herstelltechnik, der einfacheren Montagetechnik und des leichteren Gewichtes zu nennen.This solution ensures better utilization of the magnetic fluxes, whether that of the permanent magnet or that of the electromagnet. The advantages of simpler manufacturing technology, simpler assembly technology and lighter weight are particularly worth mentioning here.

Die bessere Ausnutzung der magnetischen Flüsse wird insbesondere noch dadurch erzielt, daß in der scheibenförmigen, magnetisierbaren Abdeckung gegenüber dem Magnetanker Unterbrechungen des Magnetflusses in Form von mit nicht magnetisierbarem Werkstoff ausgefüllten Zwischenräumen vorgesehen sind. Die Zwischenräume begrenzen daher Streuflußverluste.The better utilization of the magnetic fluxes is achieved in particular in that interruptions of the magnetic flux in the form of gaps filled with non-magnetizable material are provided in the disc-shaped, magnetizable cover with respect to the magnet armature. The gaps therefore limit leakage flux losses.

Eine andere Maßnahme, um die Magnetflüsse in gewünschte Bahnen zu lenken, besteht darin, daß die Magnetanker jeweils zumindest die Zwischenräume überdeckend auf der scheibenförmigen Abdeckung angeordnet sind.Another measure to steer the magnetic fluxes into desired paths is that the magnetic armatures are arranged on the disk-shaped cover, covering at least the intermediate spaces.

Vorteilhafterweise besteht der nicht magnetisierbare Werkstoff in den Zwischenräumen aus Schmelzlot oder Gießharz.The non-magnetizable material in the interstices advantageously consists of solder or cast resin.

Eine andere Verbesserung der Erfindung ist dadurch gegeben, daß das mit dem Magnetanker verbundene federnde Element unter Biegevorspannung steht. Eine solche Anordnung dient der einfachen Justierbarkeit bei der Montage, bei der die Grundlage für ein einwandfreies Funktionieren der einzelnen Teile geschaffen wird. Hierbei ist auch die Biegevorspannung ein Mittel, ein gleichmäßiges Abschießen der einzelnen Nadeln zu erzielen.Another improvement of the invention is given in that the resilient element connected to the magnet armature is under bending prestress. Such an arrangement serves for easy adjustability during assembly, in which the basis for the proper functioning of the individual parts is created. The bending pretension is also a means of achieving a uniform firing of the individual needles.

Weitere Vorteile ergeben sich aus dem Aufbau des Nadeldruckkopfes, für den der Spulenträger die Ausgangsbasis bildet. Es wird vorgeschlagen, daß der Spulenträger aus einem durch Formstanzen und abschnittsweisem Biegen hergestellten dünnwandigen Grundkörper besteht, bei dem die Jochschenkel jeweils unter die Bodenfläche abgebogen und zu einem « U mit ungleich langen Jochschenkeln hochgebogen sind, von denen die äußeren die Bodenfläche überragen.Further advantages result from the construction of the wire printhead, for which the bobbin forms the basis. It is proposed that the coil carrier consist of a thin-walled base body produced by shape stamping and section-wise bending, in which the yoke legs are each below the bottom surface bent and bent up to a "U" with unevenly long yoke legs, the outer of which protrude above the floor surface.

Bei dieser Formgebung entsteht daher ein topfähnlicher Spulenträger, in dessen Innenraum weitere Teile untergebracht werden können.With this design, a pot-like coil carrier is therefore created, in the interior of which further parts can be accommodated.

Ein solcher Spulenträger kann auch für eine nicht kreisförmige Anordnung der Drucknadeln bzw. von Druckhämmern benutzt werden. Hierfür ist dann vorgesehen, daß der Spulenträger, der Dauermagnet bzw. die scheibenförmige Abdeckung jeweils rechteckig oder rund sind.Such a bobbin can also be used for a non-circular arrangement of the printing needles or printing hammers. It is then provided for this that the coil carrier, the permanent magnet or the disk-shaped cover are each rectangular or round.

Montagevorteile ergeben sich ferner daraus, daß das federnde Element, Seitenwände des Magnetankers und eine Drucknadel eine verbundene Einheit bilden.Assembly advantages also result from the fact that the resilient element, side walls of the magnet armature and a pressure needle form a connected unit.

Eine Vereinfachung gegenüber dem Stand der Technik wird hierbei dadurch erzielt, daß die Seitenwände des Magnetankers aus einem Material von Blechdicke gefertigt sind, das zu einem biegesteifen Querschnitt bei einem dreieckförmigen Grundriß geformt ist.A simplification compared to the prior art is achieved in that the side walls of the magnet armature are made of a material of sheet thickness, which is shaped into a rigid cross-section with a triangular plan.

Der erfindungsgemäße Nadeldruckkopf ist aus ineinander übergehenden Funktionen der leichteren Montage, der zu vermeidenden Streuflüsse bzw. deren Ausnutzung und zu Gewichtsersparnis noch dahingehend ausgebildet, daß der Spulenträger, der Dauermagnet und die scheibenförmige Abdeckung in Bereichen sich aufeinanderliegend berührender ebener Flächen miteinander verbunden sind. Daraus ergibt sich eine besonders kompakte Bauform mit den genannten Funktionsvorzügen.The needle printhead according to the invention is formed from merging functions of easier assembly, the stray fluxes to be avoided or their utilization and to save weight to the extent that the coil carrier, the permanent magnet and the disk-shaped cover are connected to one another in areas of flat surfaces touching one another. This results in a particularly compact design with the functional advantages mentioned.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Es zeigen

  • Figur 1 eine Seitenansicht des Nadeldruckkopfes, in der ein teilweiser Achsenschnitt enthalten ist,
  • Figur 2 eine Draufsicht auf den Nadeldruckkopf gemäß Fig. 1, wobei einzelne Partien ebenfalls aufgeschnitten sind.
An embodiment of the invention is shown in the drawing and will be described in more detail below. Show it
  • FIG. 1 shows a side view of the needle print head, in which a partial axial section is contained,
  • FIG. 2 shows a plan view of the needle print head according to FIG. 1, individual parts also being cut open.

Der Nadeldruckkopf weist einen Spulenträger 1 auf, der am äußeren Umfang 2 zu Magnetjochen 3 weitergeformt ist, wobei ein solcher etwa schalenförmiger Spulenträger 1 aus weichem Eisenblech durch Ziehen oder Pressen und Stanzen hergestellt werden kann und einen Innenraum 1a bildet. Die Magnetjoche 3 ragen hierbei als etwa rechteckförmige Jochschenkel 3a (Fig. 2) nach oben und sind jeweils von der zugehörigen Elektromagnetspule 4 umgeben. Im Innenraum 1a befindet sich der Dauermagnet 5. Die Stirnflächen 3b und die Stirnfläche 5a liegen auf einer gleichhohen Fläche 6, die durch Abstimmung der Dicke des Dauermagneten 5 geschaffen werden kann. Auf der Fläche 6 befindet sich die magnetisierbare Abdeckung 7, die zusammen mit dem Dauermagneten 5, mit dem Spulenträger 1 und mit dem hinteren Gehäuseteil 8a eine Baueinheit bildet, die mittels der zentralen Schraube 9 verbunden ist. Die Schraube 9 ist über die Isolierhülse 10 magnetisch von dem Dauermagneten 5 und vom Spulenträger 1 getrennt. Um jede Elektromagnetspule 4 entsteht bei fehlender Bestromung der Magnetfluß 11, wobei der Magnetanker 12 in die in Fig. 1 gezeichnete Stellung gezogen wird. An dem Magnetanker 12 ist jeweils die Drucknadel 13 befestigt. Sämtliche Drucknadein 13 sind in einem Mundstück 14 des vorderen Gehäuseteils 8b geführt. Der Magnetanker 12 ist selbst an dem federnden Element 15 befestigt. Das federnde Element 15 befindet sich in der gezeichneten Stellung derart vorgespannt, daß bei Bestromen der Elektromagnetspule 4 das Magnetfeld des Dauermagneten 5 schlagartig aufgehoben wird, so daß die mechanische Kraft des federnden Elementes 15 die Masse des Magnetankers 12 mit derjenigen der Drucknadel 13 gegen den (nicht gezeigten) Aufzeichnungsträger in Richtung 16 schießt, der auf einem Druckwiderlager aufliegt (das Druckwiderlager besteht meist aus einer Druckwalze).The needle print head has a coil carrier 1 which is further shaped on the outer circumference 2 to form magnetic yokes 3, such an approximately shell-shaped coil carrier 1 being able to be produced from soft iron sheet by pulling or pressing and punching and forming an interior 1 a. The magnetic yokes 3 protrude upward as approximately rectangular yoke legs 3a (FIG. 2) and are each surrounded by the associated electromagnetic coil 4. The permanent magnet 5 is located in the interior 1a. The end faces 3b and the end face 5a lie on a surface 6 of the same height, which can be created by adjusting the thickness of the permanent magnet 5. On the surface 6 there is the magnetizable cover 7, which together with the permanent magnet 5, with the coil carrier 1 and with the rear housing part 8a forms a structural unit which is connected by means of the central screw 9. The screw 9 is magnetically separated from the permanent magnet 5 and from the coil carrier 1 via the insulating sleeve 10. When there is no current supply, the magnetic flux 11 is created around each electromagnetic coil 4, the magnet armature 12 being pulled into the position shown in FIG. 1. The pressure needle 13 is attached to the magnet armature 12. All Drucknadein 13 are guided in a mouthpiece 14 of the front housing part 8b. The magnet armature 12 is itself fastened to the resilient element 15. The resilient element 15 is in the drawn position so biased that when the solenoid 4 is energized, the magnetic field of the permanent magnet 5 is abruptly canceled, so that the mechanical force of the resilient element 15, the mass of the magnet armature 12 with that of the pressure needle 13 against the ( shoots not shown) shoots in direction 16, which rests on a platen (the platen usually consists of a pressure roller).

Bei dieser Konstruktion ist jeder Magnetanker 12 aus leichten Seitenwänden 12a und 12b aufgebaut und mit der Magnetplatte 17 verbunden. Das federnde Element 15 ist mit den Schrauben 18a und 18b mit der Magnetplatte 17 verbunden. Außerdem ist das federnde Element 15 an seinem freien Ende hebelförmig mittels der Befestigungsschraube 19 und dem Anpassungsstück 20 auf der Abdeckung 7 festgelegt.In this construction, each magnet armature 12 is constructed from light side walls 12a and 12b and connected to the magnet plate 17. The resilient element 15 is connected to the magnetic plate 17 by means of the screws 18a and 18b. In addition, the resilient element 15 is lever-shaped at its free end by means of the fastening screw 19 and the adapter 20 on the cover 7.

Die Abdeckung 7 ist im Ausführungsbeispiel nicht einteilig, sondern besteht aus der Innenplatte 7a und dem Außenring 7b, die zwischen sich einen Zwischenraum 21 bilden. Dieser Zwischenraum 21 ist mit nicht magnetisierbarem Werkstoff, wie z. B. Schmelzlot, Gießharz, Klebemittel, Keramik oder dgl., ausgefüllt. Die Zwischenräume 21 lassen den magnetischen Fluß in genau bestimmbaren Bahnen ohne nachteilige Streuflüsse fließen.In the exemplary embodiment, the cover 7 is not in one piece, but consists of the inner plate 7a and the outer ring 7b, which form an intermediate space 21 between them. This space 21 is made of non-magnetizable material, such as. B. fusible link, casting resin, adhesive, ceramic or the like. The gaps 21 allow the magnetic flux to flow in precisely definable trajectories without disadvantageous stray fluxes.

Der Spulenträger 1 wird durch Formstanzen und darauffolgendem Biegen aus ebenen Blechplatinen hergestellt. Der Spulenträger 1 stellt daher einen wirtschaftlich herstellbaren, leichten Grundkörper 1 dar. Die Jochschenkel 3a sind bis unter die Bodenfläche 1b abgebogen und zu einem « U » mit ungleich langen Schenkeln hochgebogen, von dem die äußeren die Bodenfläche 1 b überragen.The coil carrier 1 is produced by stamping and then bending from flat sheet metal blanks. The coil carrier 1 therefore represents an economically producible, lightweight base body 1. The yoke legs 3a are bent down to below the base surface 1b and bent up to form a “U” with legs of unequal length, the outer ones of which project beyond the base surface 1b.

Die Erfindung ist nicht nur auf eine kreisrunde Anordnung der Drucknadeln 13 beschränkt. Die Anordnung der Drucknadeln kann auch in langen. parallelen Reihen erfolgen, so daß die Jochschenkel dann ebenfalls parallele Reihen bilden.The invention is not limited to a circular arrangement of the printing needles 13. The arrangement of the printing needles can also be long. parallel rows take place so that the yoke legs then also form parallel rows.

Die Seitenwände 12a, 12b, die Drucknadel 13 und das federnde Element 15 sind jeweils zu einer Einheit vermittels Schrauben, Schweißen oder Löten verbunden. Die Seitenwände 12a, 12b sind außerdem aus einem Material von Blechdicke gefertigt, wobei ein biegesteifer Querschnitt 22 mit einem dreieckförmigen Grundriß 23 gebildet ist.The side walls 12a, 12b, the pressure needle 13 and the resilient element 15 are each connected to a unit by means of screwing, welding or soldering. The side walls 12a, 12b are also made of a material of sheet thickness, a rigid cross section 22 having a triangular outline 23 being formed.

Eine Baueinheit bilden außerdem der Spulenträger 1, der Dauermagnet 5 und die scheibenförmige Abdeckung 7, die flach aufeinanderliegend zu einer kompakten Einheit verbunden sind.The coil carrier 1, the permanent magnet 5 and the disk-shaped cover 7, which are connected flat to one another to form a compact unit, also form a structural unit.

Claims (10)

1. Needle print head for matrix printers with a spool carrier (1) which has magnet yokes (3) distributed at intervals, with which there are associated in each case an electro-magnet coil surrounding a magnet yoke, and a magnet armature, attached to a resilient element (15), which is connected with the rear end of a print needle (13), with the anterior end of which impression points are able to be produced on a recording medium by selectively supplying current to the electro-magnet coils, and with a shaped permanent magnet (5) which is provided in the core region of the spool carrier, characterized in that the spool carrier (1) itself on the outer circumference (2) or rim forms magnet yokes (3) in the array of print needles (13), that the magnet yokes (3) and the electro-magnet coils (4) which are used form a plane surface (6) by their respective outer sides with the disc-shaped permanent magnet (5) arranged in the interior (1a) of the spool carrier (1), that a magnetizable covering (7) is provided which is disc-shaped, covers the electro-magnet coils (4) and is placed onto the common plane surface (6), and that the magnet armature (12) for one print needle (13) in each case lies opposite the electromagnet coil (4) on the covering (7).
2. Needle print head according to Claim 1, characterized in that in the disc-shaped, magnetizable covering (7) opposite the magnet armature (12) interruptions to the magnetic flux are provided in the form of intermediate spaces (21) filled with non-magnetizable material.
3. Needle print head according to Claims 1 and 2, characterized in that the magnet armatures (12) are arranged in each case at least covering the intermediate spaces (21) on the disc-shaped covering (7).
4. Needle print head according to Claims 1 to 3, characterized in that the non-magnetizable material in the intermediate spaces (21) consists of melt solder or casting resin.
5. Needle print head according to Claims 1 to 4, characterized in that the resilient element (15), which is connected with the magnet armature (12) is under bending pre-tension.
6. Needle print head according to Claims 1 to 5, characterized in that the spool carrier (1) consists of a thin-walled base body (1a) which is produced by form stamping and bending in sections, in which the yoke shanks (3a) in each case are bent under the base surface (1b) and bent up into a « U with yoke shanks of unequal length, the outer of which project above the base surface (1 b).
7. Needle print head according to Claims 1 to 6, characterized in that the spool carrier (1), the permanent magnet (5) or respectively the disc-shaped covering (7) in each case are rectangular or round.
8. Needle print head according to one or more of Claims 1 to 7, characterized in that the resilient element (15), side walls (12a, 12b) of the magnet armature (12) and a print needle (13) form one connected unit.
9. Needle print head according to Claims 1 to 8, characterized in that the side walls (21 a, 12b) of the magnet armature are manufactured from a material of the thickness of sheet metal, which is formed into a section (22) resistant to bending with a triangular shaped outline (23).
10. Needle print head according to Claims 1 to 9, characterized in that the spool carrier (1), the permanent magnet (5) and the disc-shaped covering (7) are connected with each other in regions of plane surfaces meeting one over the other.
EP83730097A 1982-11-22 1983-10-10 Needle printing head for a matrix printer Expired EP0112275B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823243477 DE3243477A1 (en) 1982-11-22 1982-11-22 NEEDLE PRINT HEAD FOR MATRIX PRINTER
DE3243477 1982-11-22

Publications (2)

Publication Number Publication Date
EP0112275A1 EP0112275A1 (en) 1984-06-27
EP0112275B1 true EP0112275B1 (en) 1986-03-05

Family

ID=6178920

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83730097A Expired EP0112275B1 (en) 1982-11-22 1983-10-10 Needle printing head for a matrix printer

Country Status (4)

Country Link
US (1) US4552471A (en)
EP (1) EP0112275B1 (en)
JP (1) JPS5996975A (en)
DE (2) DE3243477A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3502472A1 (en) * 1985-01-25 1986-07-31 Mannesmann AG, 4000 Düsseldorf METHOD FOR PRODUCING AN ANCHOR ASSEMBLY FOR A MATRIX PRINT HEAD
JPS6358909A (en) * 1986-08-29 1988-03-14 エヌ・シー・アール・コーポレーション Magnetic bias of magnetic unit
JPH0435176Y2 (en) * 1986-11-25 1992-08-20

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2287340A1 (en) * 1974-10-08 1976-05-07 Sagem IMPROVEMENTS MADE TO DEVICES OR PRINTING HEADS FOR PRINTERS OR SIMILAR AND METHOD OF MANUFACTURING SUCH A PRINTING HEAD
SE7606042L (en) * 1975-10-10 1977-04-11 Florida Data Corp QUICK-OPERATING ELECTROMAGNETIC PRINTING HEAD
JPH0569711B2 (en) * 1978-03-10 1993-10-01 Dh Ass
US4401392A (en) * 1979-05-14 1983-08-30 Blomquist James E Dot matrix print head
JPS5849192B2 (en) * 1979-08-14 1983-11-02 日本電信電話株式会社 Print head for dot printer
GB2066740B (en) * 1979-12-07 1983-11-09 Seikosha Kk Moving coil type printing head
GB2064874B (en) * 1979-12-10 1984-10-17 Florida Data Corp Electromagnetic actuator for high speed dot matrix impact printer
JPS5856354B2 (en) * 1980-03-12 1983-12-14 沖電気工業株式会社 wire print head
JPS5784882A (en) * 1980-11-17 1982-05-27 Ibm Hammer mechanism

Also Published As

Publication number Publication date
DE3243477C2 (en) 1987-09-10
JPH0227947B2 (en) 1990-06-20
JPS5996975A (en) 1984-06-04
DE3243477A1 (en) 1984-05-24
US4552471A (en) 1985-11-12
DE3362456D1 (en) 1986-04-10
EP0112275A1 (en) 1984-06-27

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