EP0112274B1 - Needle printing head for a matrix printer - Google Patents

Needle printing head for a matrix printer Download PDF

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Publication number
EP0112274B1
EP0112274B1 EP83730096A EP83730096A EP0112274B1 EP 0112274 B1 EP0112274 B1 EP 0112274B1 EP 83730096 A EP83730096 A EP 83730096A EP 83730096 A EP83730096 A EP 83730096A EP 0112274 B1 EP0112274 B1 EP 0112274B1
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EP
European Patent Office
Prior art keywords
magnets
plane
hollow body
hinged
printer head
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EP83730096A
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German (de)
French (fr)
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EP0112274A1 (en
Inventor
Bernd Dipl.-Ing. Gugel
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Vodafone GmbH
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Mannesmann AG
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/22Typewriters 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
    • B41J2/23Typewriters 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
    • B41J2/27Actuators for print wires
    • B41J2/275Actuators for print wires of clapper type

Definitions

  • the invention relates to a wire dot print head for matrix printers, with a composite body which carries several U-magnets forming pole leg pairs, each of which is assigned a magnet coil and a hinged armature, with bearing surfaces for the hinged armatures which are defined by the end faces of the pole leg pairs and which are located in a common plane a plane-parallel central reference plane set back from the support surface plane (by a distance delta-x), which is decisive for the stop of the hinged anchor in the rest position.
  • the hinged armature With the hinged armature principle, the armature rests more or less on the magnetic core (pole leg pair) in point or line form in the rest position. This contact surface is therefore inadequate and causes an electromagnetic low efficiency. However, an incomplete support of the hinged anchor leads to different pressure forces even with several printing needles, so that the printing needles generate different pressure points on the recording medium.
  • the storage of the hinged anchor and that of the pole leg pair and other parts form sources of tolerance errors in needle printheads, which represent an undesirable deviation, which results in defects in the following areas: in the structure of the needle printhead, in the size of the needle printhead, in the print quality, in electrical power consumption, in terms of simple, tolerance-assured producibility, in the electronic control of the needle selection (IC circuits) and in terms of service life.
  • the needle printhead described at the outset is known from DE-A-2 936 578, 2 947 398 and 3 133 083.
  • the U-magnets forming pole leg pairs are fastened radially inside and radially outside by means of axial or radial groove guides in a tube as a composite body or in a central hub.
  • the outer groove guides correspond approximately to the dovetail grooves known from machine tool construction.
  • the pressure needle drive assemblies each consisting of a pair of pole legs with an electromagnetic coil and folding armature, are not arranged behind the pressure needle guide assembly, but rather concentrically surrounding it.
  • the rest position of the hinged anchors is therefore determined by a damping ring, which rests on a separate cover part.
  • the production of such a needle printhead is complex, lengthy and therefore uneconomical because of the required accuracy.
  • the base plate is made in one piece with the pole leg pairs as a composite body and the end faces of the pole leg pairs define a common plane for the support of the radially outer hinged arm arms, but is located the set back, plane-parallel central reference plane, which is decisive for the stop of the radially inner folding anchor arms in the rest position, on a separate stop ring.
  • This ring is guided on a separate guide shaft belonging to the pressure needle guide assembly and is pressed against the end face of a sleeve by means of a screw penetrating the composite body on the base plate.
  • the position of the separate stop ring is associated with large disadvantageous tolerances, so that the rest position of the hinged anchor is different from printhead to printhead.
  • a solution is also known (US Pat. No. 4,230,038) in which the construction principle is implemented with the hinged anchors mounted between the pressure needle guide assembly and the pressure needle drive assembly.
  • the anchor stop on the side of the pressure needle guide assembly is formed by means of damping rings, so that a solution is eliminated in which the relevant anchor stop surface and a reference plane for the anchor stop could be machined in one operation.
  • the anchor stop surfaces in the rest position of the folding anchors are in the housing of the pressure needle guide assembly, and the end faces of the pole leg pairs are in the housing of the pressure needle drive assembly.
  • the hinged anchors are exposed to one another and to different tolerances of the position from printhead to printhead.
  • the object of the present invention is to fundamentally increase the quality of a wire dot print head in the most important areas by proposing a design which allows the smallest tolerance ranges to be observed.
  • the composite body consists of an im Cross-section U-shaped hollow body, on the outer surface of which the U-magnets are fastened and on which either the reference plane is formed on the end face or a retracted hub is formed for receiving a stop or damping body which forms the reference plane.
  • the measures according to the invention also eliminate further deviations that were previously unavoidable in several clamping processes.
  • tolerances of 4/100 to 6/100 mm have so far been accepted, which lead to different air gaps on the hinged anchors, so that the energization processes lead to different movements of the printing needles.
  • a resulting different printing intensity leads to uneven writing and in extreme cases, individual printing needles can also fail completely, so that the needle print head in question is to be treated as a reject. Further advantages result from the simpler assembly of a wire print head equipped with the composite body according to the invention.
  • the composite body has only a very low weight, which is essentially determined by the weight of the pole leg pairs.
  • An improvement of the invention is that pocket-shaped recesses are formed on the hollow body to form the composite body with the U-magnets and that the free leg ends of the U-shaped hollow body are provided with a laterally projecting flange part, in which the relevant recesses are incorporated laterally .
  • the design according to the invention can also be transferred to other types of dot matrix printers. It is further provided that the composite body is designed in its basic form as a polygonal body or as an approximately U-shaped body designed as a rod. The latter design is used for line printers. From a manufacturing point of view, the composite body can be produced particularly advantageously in that the U-magnets are fastened to the outer circumference by adhesive or soldered connections on the injection-molded or cast hollow body.
  • the coil carrier 1 is produced according to the first exemplary embodiment (FIGS. 1 and 2) from the cast or injection-molded hollow body 2 and serves as a composite body.
  • the electromagnetic coils are not shown.
  • the material of the hollow body 2 consists of plastics, such as. B. polyamides.
  • In the hollow body 2 there are recesses 3 with the outer shape of the U-magnets 4.
  • the U-magnets 4 are made of ferritic materials and form with their end faces 5 a common plane 5a, either by a single machining or by a precise position of the U-magnets 4 are created during casting or injection molding.
  • the hollow body 2 is advantageously provided with a reference plane 5b as a stop surface, which is deliberately related to the plane 5a and which stops the hinged anchors during their backward movement.
  • the hollow body 2 forms a cavity 5c, which contributes significantly to the reduction in weight and creates space for better cooling or heat radiation.
  • the holes 5d are used for fastening screws for a housing of the pressure needle guide assembly, not shown.
  • the coil carrier 6 consists of the thin-walled, shell-shaped hollow body 7, which is likewise produced by casting or spraying.
  • the U-magnets 4 are fastened by adhesive or soldered connections.
  • the ferritic U-magnets 4 can in this case be ground down again to the plane 5a or, after gluing or soldering, aligned with the common plane 5a in a single machining operation.
  • the cross-sectional design of the hollow body 7, which forms a polygonal body 7a on the outside (FIG. 4), is designed in the core as a retracted hub 7b. Within this hub 7b is the stop or damping body 8, the reference plane 5b of which is in relation to the common plane 5a, depending on the design features of the folding anchors.
  • the hollow body 9 is approximately U-shaped as a rod and the U magnets 4 are glued or soldered to the likewise very thin-walled legs of the “U”.
  • the common plane 5a for the end faces 5 results here, as does the stop or damping body 8, which is formed here from a strand 10 made of plastic.
  • the significant distance «delta-x for the movement path of the (not shown) hinged anchor determined.
  • the cavity 5c also enables favorable heat dissipation for a thermally highly stressed wire print head.
  • the exemplary embodiment according to FIGS. 5 and 6, however, is directed more towards a “needle bank” and a “hammer bank”, as are usually used for line printers.

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  • Impact Printers (AREA)

Description

Die Erfindung betrifft einen Nadeldruckkopf für Matrixdrucker, mit einem Verbundkörper der mehrere, U-Magnete bildende Polschenkelpaare trägt, denen jeweils eine Magnetspule und ein Klappanker zugeordnet sind, mit durch die Stirnseiten der Polschenkelpaare festgelegten, in einer gemeinsamen Ebene liegenden Auflageflächen für die Klappanker, mit einer gegenüber der Auflageflächen-Ebene (um einen Abstand delta-x) zurückgesetzten planparallelen zentralen Bezugsebene, die für den Anschlag der Klappanker in Ruhestellung maßgeblich ist.The invention relates to a wire dot print head for matrix printers, with a composite body which carries several U-magnets forming pole leg pairs, each of which is assigned a magnet coil and a hinged armature, with bearing surfaces for the hinged armatures which are defined by the end faces of the pole leg pairs and which are located in a common plane a plane-parallel central reference plane set back from the support surface plane (by a distance delta-x), which is decisive for the stop of the hinged anchor in the rest position.

Beim Klappankerprinzip liegt der Anker in Ruhestellung mehr oder weniger auf dem Magnetkern (Polschenkelpaar) punkt- oder linienförmig auf. Diese Auflagefläche ist daher unzureichend und verursacht einen elektromagnetisch niedrigen Wirkungsgrad. Eine unvollständige Auflage des Klappankers führt jedoch auch bei mehreren Drucknadeln zu unterschiedlichen Druckkräften, so daß die Drucknadeln unterschiedliche Druckpunkte auf dem Aufzeichnungsträger erzeugen.With the hinged armature principle, the armature rests more or less on the magnetic core (pole leg pair) in point or line form in the rest position. This contact surface is therefore inadequate and causes an electromagnetic low efficiency. However, an incomplete support of the hinged anchor leads to different pressure forces even with several printing needles, so that the printing needles generate different pressure points on the recording medium.

Die Lagerung des Klappankers und diejenige des Polschenkelpaares und weiterer Teile bilden Quellen für Toleranzfehler in Nadeldruckköpfen, die eine unerwünschte Abweichung darstellen, aus der sich Mängel in den folgenden Bereichen ergeben : im Aufbau des Nadeldruckkopfes, in der Baugröße des Nadeldruckkopfes, in der Druckqualität, im elektrischen Leistungsverbrauch, bezüglich einfacher, toleranzsicherer Herstellbarkeit, in der elektronischen Steuerung der Nadelselektion (IC-Schaltkreise) und bezüglich Lebensdauer.The storage of the hinged anchor and that of the pole leg pair and other parts form sources of tolerance errors in needle printheads, which represent an undesirable deviation, which results in defects in the following areas: in the structure of the needle printhead, in the size of the needle printhead, in the print quality, in electrical power consumption, in terms of simple, tolerance-assured producibility, in the electronic control of the needle selection (IC circuits) and in terms of service life.

Die Verwirklichung kleinstmöglicher Toleranzen in- sämtlichen der vorstehend aufgezählten Teilbereichen erweist sich als wirtschaftliches Problem. Jedoch auch bei einer nur teilweisen Erfüllung von ausreichenden Toleranzen in einem Teil der vorstehenden Bereiche besteht das technische Problem der unzureichenden Herstellungsgenauigkeit mit allen ihren Auswirkungen auf die entsprechenden Funktionsbereiche.Realizing the smallest possible tolerances in all of the sub-areas listed above proves to be an economic problem. However, even if only a partial fulfillment of sufficient tolerances in some of the above areas, there is the technical problem of inadequate manufacturing accuracy with all its effects on the corresponding functional areas.

Der eingangs bezeichnete Nadeldruckkopf ist aus den DE-A-2 936 578, 2 947 398 und 3 133 083 bekannt.The needle printhead described at the outset is known from DE-A-2 936 578, 2 947 398 and 3 133 083.

Eine solche Anordnung der Teile ist daher im wesentlichen auf eine kompakte Zuordnung der Teile untereinander und auf eine geringe Baugröße des Nadeldruckkopfes im allgemeinen gerichtet. Mit einer solchen Gestaltung sind jedoch keinesfalls ohne besondere Maßnahmen die erwähnten Mängel der einzelnen Funktionsbereiche erfaßt. Solche besonderen Maßnahmen sind bei dem bekannten Gegenstand nicht erkennbar.Such an arrangement of the parts is therefore essentially directed to a compact assignment of the parts to one another and to a small overall size of the dot-matrix print head in general. With such a design, however, the shortcomings of the individual functional areas mentioned are in no way covered without special measures. Such special measures are not recognizable in the known subject.

Bei einem anderen bekannten Nadeldruckkopf der Klappankerbauart (GB 20 82 508) sind die U-Magnete bildenden Polschenkelpaare radial innen und radial außen mittels axialen bzw. radialen Nutführungen in einem Rohr als Verbundkörper bzw. in einer zentrischen Nabe befestigt. Die äußeren Nutführungen entsprechen etwa den aus dem Werkzeugmaschinenbau bekannten Schwalbenschwanznuten. Die jeweils aus einem Polschenkelpaar mit Elektromagnetspule und Klappanker bestehenden Drucknadelantriebsbaugruppen sind jedoch nicht hinter der Drucknadelführungsbaugruppe, sondern diese konzentrisch umgebend angeordnet. Die Ruhestellung der Klappanker wird daher durch einen Dämpfungsring bestimmt, der an einem separaten Deckelteil anliegt. Die Herstellung eines solchen Nadeldruckkopfes ist wegen der erforderlichen Genauigkeit aufwendig, langwierig und daher unwirtschaftlich.In another known needle printhead of the hinged armature type (GB 20 82 508), the U-magnets forming pole leg pairs are fastened radially inside and radially outside by means of axial or radial groove guides in a tube as a composite body or in a central hub. The outer groove guides correspond approximately to the dovetail grooves known from machine tool construction. However, the pressure needle drive assemblies, each consisting of a pair of pole legs with an electromagnetic coil and folding armature, are not arranged behind the pressure needle guide assembly, but rather concentrically surrounding it. The rest position of the hinged anchors is therefore determined by a damping ring, which rests on a separate cover part. The production of such a needle printhead is complex, lengthy and therefore uneconomical because of the required accuracy.

Bei einem anderen, eingangs bezeichneten Klappanker-Nadeldruckkopf (GB 20 75 427) ist zwar die Grundplatte zusammen mit den Polschenkelpaaren einstückig als Verbundkörper ausgeführt und die Stirnseiten der Polschenkelpaare legen eine gemeinsame Ebene für die Auflage der radial äußeren Klappanker-Arme fest, jedoch befindet sich die zurückgesetzte, zu der gemeinsamen Ebene planparallele zentrale Bezugsebene, die für den Anschlag der radial inneren Klappanker-Arme in Ruhestellung maßgeblich ist, an einem separaten Anschlagring. Dieser Ring ist auf einem zur Drucknadelführungsbaugruppe gehörenden separaten Führungsschaft geführt und wird gegen die Stirnfläche einer Hülse mittels einer den Verbundkörper an der Grundplatte durchdringenden Schraube gedrückt. Die Lage des separaten Anschlagringes ist mit großen nachteiligen Toleranzen behaftet, so daß von Druckkopf zu Druckkopf die Ruhestellung der Klappanker unterschiedlich ausfällt.In the case of another hinged anchor needle printhead (GB 20 75 427) mentioned at the outset, the base plate is made in one piece with the pole leg pairs as a composite body and the end faces of the pole leg pairs define a common plane for the support of the radially outer hinged arm arms, but is located the set back, plane-parallel central reference plane, which is decisive for the stop of the radially inner folding anchor arms in the rest position, on a separate stop ring. This ring is guided on a separate guide shaft belonging to the pressure needle guide assembly and is pressed against the end face of a sleeve by means of a screw penetrating the composite body on the base plate. The position of the separate stop ring is associated with large disadvantageous tolerances, so that the rest position of the hinged anchor is different from printhead to printhead.

Es ist außerdem eine Lösung bekannt (US 42 30 038), bei der das Bauprinzip mit den zwischen der Drucknadelführungsbaugruppe und der Drucknadelantriebsbaugruppe gelagerten Klappankern verwirklicht ist. Allerdings ist bei dieser Bauweise der Ankeranschlag auf der Seite der Drucknadelführungsbaugruppe mittels Dämpfungsringen gebildet, so daß eine Lösung ausscheidet, bei der in einem Arbeitsgang die maßgebliche Anker-Anschlagfläche und eine Bezugsebene für den Ankeranschlag bearbeitet werden könnten. Die Ankeranschlagflächen in Ruhestellung der Klappanker liegen nämlich in dem Gehäuse der Drucknadelführungsbaugruppe, und die Stirnseiten der Polschenkelpaare liegen in dem Gehäuse der Drucknadelantriebsbaugruppe. Somit sind die Klappanker untereinander und von Druckkopf zu Druckkopf unterschiedlichen Toleranzen der Lage ausgesetzt.A solution is also known (US Pat. No. 4,230,038) in which the construction principle is implemented with the hinged anchors mounted between the pressure needle guide assembly and the pressure needle drive assembly. However, in this design, the anchor stop on the side of the pressure needle guide assembly is formed by means of damping rings, so that a solution is eliminated in which the relevant anchor stop surface and a reference plane for the anchor stop could be machined in one operation. The anchor stop surfaces in the rest position of the folding anchors are in the housing of the pressure needle guide assembly, and the end faces of the pole leg pairs are in the housing of the pressure needle drive assembly. Thus, the hinged anchors are exposed to one another and to different tolerances of the position from printhead to printhead.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, die Qualität eines Nadeldruckkopfes grundsätzlich in den wichtigsten Bereichen zu steigern, indem eine Gestaltung vorgeschlagen wird, die die Einhaltung geringster Toleranzbereiche erlaubt.The object of the present invention is to fundamentally increase the quality of a wire dot print head in the most important areas by proposing a design which allows the smallest tolerance ranges to be observed.

Die gestellte Aufgabe wird bei der eingangs bezeichneten Gattung erfindungsgemäß dadurch gelöst, daß der Verbundkörper aus einem im Querschnitt U-förmigen Hohlkörper besteht, an dessen Außenfläche die U-Magnete befestigt sind und an dem entweder stirnseitig die Bezugsebene ausgebildet ist oder eine eingezogene Nabe für die Aufnahme eines Anschlag- bzw. Dämpfungskörpers ausgebildet ist, der die Bezugsebene bildet. Diese Maßnahmen steigern die Qualität des Druckkopfes erheblich. Es wird nämlich ermöglicht, in einem einzigen Arbeitsgang, d. h. unter einmaligem Festspannen des Werkstückes sämtliche Jochstirnflächen an ein und derselben Stirnaußenseite zu bearbeiten, falls ein solcher Arbeitsgang überhaupt noch erforderlich wird. Die Polschenkelpaare können nämlich entweder vorbearbeitet sein oder aber so präzise in eine Guß- bzw. Spritzgußform eingelegt werden, daß die gemeinsame Auflagefläche für die Klappanker ohne Toleranzabweichungen entsteht.The stated object is achieved according to the invention in the genus described in the introduction in that the composite body consists of an im Cross-section U-shaped hollow body, on the outer surface of which the U-magnets are fastened and on which either the reference plane is formed on the end face or a retracted hub is formed for receiving a stop or damping body which forms the reference plane. These measures significantly increase the quality of the print head. It is in fact possible to machine all yoke end faces on one and the same outside face in a single operation, that is to say with a single clamping of the workpiece, if such an operation is still necessary at all. This is because the pole leg pairs can either be pre-machined or placed so precisely in a casting or injection mold that the common bearing surface for the hinged anchors is produced without tolerance deviations.

Mit den erfindungsgemäßen Maßnahmen entfallen außerdem weitere Abweichungen, die bei mehreren Einspannvorgängen bislang unvermeidbar waren. Bei Blechkonstruktionen sind bislang Toleranzen von 4/100 bis 6/100 mm in Kauf genommen worden, die zu unterschiedlichen Luftspalten an den Klappankern führten, so daß die Bestromungsvorgänge zu unterschiedlichen Bewegungen der Drucknadeln führten. Eine daraus entstehende unterschiedliche Druckintensität führt jedoch zu ungleichmäßigem Schreiben und in Extremfällen können einzelne Drucknadeln auch ganz ausfallen, so daß der betreffende Nadeldruckkopf als Ausschuß zu behandeln ist. Weitere Vorteile ergeben sich durch die einfachere Montage eines mit dem erfindungsgemäßen Verbundkörper ausgerüsteten Nadeldruckkopfes.The measures according to the invention also eliminate further deviations that were previously unavoidable in several clamping processes. In sheet metal constructions, tolerances of 4/100 to 6/100 mm have so far been accepted, which lead to different air gaps on the hinged anchors, so that the energization processes lead to different movements of the printing needles. A resulting different printing intensity leads to uneven writing and in extreme cases, individual printing needles can also fail completely, so that the needle print head in question is to be treated as a reject. Further advantages result from the simpler assembly of a wire print head equipped with the composite body according to the invention.

Weitere Vorteile der erfindungsgemäßen Lösung sind : Der Verbundkörper weist nur ein sehr geringes Gewicht auf, das im wesentlichen noch durch das Gewicht der Polschenkelpaare bestimmt wird.Further advantages of the solution according to the invention are: The composite body has only a very low weight, which is essentially determined by the weight of the pole leg pairs.

Eine Verbesserung der Erfindung besteht darin, daß an dem Hohlkörper zur Bildung des Verbundkörpers mit den U-Magneten taschenförmige Ausnehmungen eingearbeitet sind und daß die freien Schenkelenden des U-förmigen Hohlkörpers mit einem seitlich wegstehenden Flanschteil versehen sind, in dem seitlich die betreffenden Ausnehmungen eingearbeitet sind.An improvement of the invention is that pocket-shaped recesses are formed on the hollow body to form the composite body with the U-magnets and that the free leg ends of the U-shaped hollow body are provided with a laterally projecting flange part, in which the relevant recesses are incorporated laterally .

Die erfindungsgemäße Bauart läßt sich außerdem auf andere Arten von Nadeldruckern übertragen. So ist weiter vorgesehen, daß der Verbundkörper in seiner Grundform als ein Polygonalkörper oder als ein etwa U-förmiger, als Stab ausgebildeter Körper ausgeführt ist. Letztere Bauform wird für Zeilendrucker verwendet. Fertigungstechnisch läßt sich der Verbundkörper besonders vorteilhaft dadurch herstellen, daß an dem gespritzten oder gegossenen Hohlkörper die U-Magnete am Außenumfang durch Klebe- oder Lötverbindungen befestigt sind.The design according to the invention can also be transferred to other types of dot matrix printers. It is further provided that the composite body is designed in its basic form as a polygonal body or as an approximately U-shaped body designed as a rod. The latter design is used for line printers. From a manufacturing point of view, the composite body can be produced particularly advantageously in that the U-magnets are fastened to the outer circumference by adhesive or soldered connections on the injection-molded or cast hollow body.

Mehrere Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im folgenden näher beschrieben. Es zeigtSeveral embodiments of the invention are shown in the drawing and are described in more detail below. It shows

Fig. 1 einen axialen Querschnitt durch den Spulenträger eines ersten Ausführungsbeispiels,

  • Fig. 2 die Draufsicht auf den Spulenträger gemäß Fig. 1,
  • Fig. 3 einen axialen Querschnitt durch den Spulenträger eines zweiten Ausführungsbeispiels,
  • Fig. 4 die Draufsicht auf den Spulenträger gemäß Fig. 3,
  • Fig. 5 eine Draufsicht auf den Spulenträger eines dritten Ausführungsbeispiels und
  • Fig. 6 den axialen Querschnitt durch den Spulenträger gemäß Fig. 5.
1 is an axial cross section through the coil carrier of a first embodiment,
  • 2 shows the top view of the coil carrier according to FIG. 1,
  • 3 shows an axial cross section through the coil carrier of a second exemplary embodiment,
  • 4 shows the top view of the coil carrier according to FIG. 3,
  • Fig. 5 is a plan view of the bobbin of a third embodiment and
  • 6 shows the axial cross section through the coil carrier according to FIG. 5.

Der Spulenträger 1 ist nach dem ersten Ausführungsbeispiel (Fig. 1 und 2) aus dem gegossenen oder gespritzten Hohlkörper 2 hergestellt und dient als Verbundkörper. Die Elektromagnetspulen sind nicht gezeichnet. Der Werkstoff des Hohlkörpers 2 besteht aus Kunststoffen, wie z. B. Polyamiden. In dem Hohlkörper 2 befinden sich Ausnehmungen 3 mit der äußeren Form der U-Magnete 4. Die U-Magnete 4 bestehen aus ferritischen Werkstoffen und bilden mit ihren Stirnseiten 5 eine gemeinsame Ebene 5a, die entweder durch ein einmaliges Bearbeiten oder durch eine präzise Lage der U-Magnete 4 beim Umgießen oder Umspritzen entsteht.The coil carrier 1 is produced according to the first exemplary embodiment (FIGS. 1 and 2) from the cast or injection-molded hollow body 2 and serves as a composite body. The electromagnetic coils are not shown. The material of the hollow body 2 consists of plastics, such as. B. polyamides. In the hollow body 2 there are recesses 3 with the outer shape of the U-magnets 4. The U-magnets 4 are made of ferritic materials and form with their end faces 5 a common plane 5a, either by a single machining or by a precise position of the U-magnets 4 are created during casting or injection molding.

Der Hohlkörper 2 ist vorteilhaft mit einer Bezugsebene 5b als Anschlagfläche versehen, die in einem gewollten Bezug zur Ebene 5a steht und die die Klappanker bei ihrer Rückwärtsbewegung abstoppt. Der Hohlkörper 2 bildet dabei einen Hohlraum 5c, der zur Gewichtsverminderung erheblich beiträgt und Raum für eine bessere Kühlung bzw. Wärmeabstrahlung schafft. Die Bohrungen 5d dienen für Befestigungsschrauben für ein weiter nicht gezeigtes Gehäuse der Drucknadelführungsbaugruppe.The hollow body 2 is advantageously provided with a reference plane 5b as a stop surface, which is deliberately related to the plane 5a and which stops the hinged anchors during their backward movement. The hollow body 2 forms a cavity 5c, which contributes significantly to the reduction in weight and creates space for better cooling or heat radiation. The holes 5d are used for fastening screws for a housing of the pressure needle guide assembly, not shown.

Der Spulenträger 6 besteht gemäß dem zweiten Ausführungsbeispiel (Fig. 3 und 4) aus dem dünnwandigen, schalenförmigen Hohlkörper 7, der ebenfalls durch Gießen oder Spritzen hergestellt wird. Am Außenumfang dieses ebenfalls sehr leichten Hohlkörpers 7 sind die U-Magnete 4 durch Klebe- oder Lötverbindungen befestigt. Die ferritischen U-Magnete 4 können hierbei wieder auf die Ebene 5a abgeschliffen oder nach dem Kleben bzw. Löten mit einem einzigen spanabhebenden Arbeitsgang auf die gemeinsame Ebene 5a ausgerichtet sein. Die Querschnittsgestaltung des Hohlkörpers 7, der außen einen Polygonalkörper 7a bildet (Fig. 4) ist im Kern als eingezogene Nabe 7b ausgeführt. Innerhalb dieser Nabe 7b befindet sich der Anschlag- bzw. Dämpfungskörper 8, dessen Bezugsebene 5b in bezug zur gemeinsamen Ebene 5a je nach den Konstruktionsmerkmalen der Klappanker steht.According to the second exemplary embodiment (FIGS. 3 and 4), the coil carrier 6 consists of the thin-walled, shell-shaped hollow body 7, which is likewise produced by casting or spraying. On the outer circumference of this hollow body 7, which is also very light, the U-magnets 4 are fastened by adhesive or soldered connections. The ferritic U-magnets 4 can in this case be ground down again to the plane 5a or, after gluing or soldering, aligned with the common plane 5a in a single machining operation. The cross-sectional design of the hollow body 7, which forms a polygonal body 7a on the outside (FIG. 4), is designed in the core as a retracted hub 7b. Within this hub 7b is the stop or damping body 8, the reference plane 5b of which is in relation to the common plane 5a, depending on the design features of the folding anchors.

Nach einem dritten Ausführungsbeispiel (Fig. 5 und 6) ist der Hohlkörper 9 etwa U-förmig als Stab gebildet und die U-Magnete 4 sind an den ebenfalls sehr dünnwandigen Schenkeln des « U » angeklebt oder angelötet. Die gemeinsame Ebene 5a für die Stirnseiten 5 ergibt sich hierbei ebenso wie der Anschlag- bzw. Dämpfungskörper 8, der hier aus einem Strang 10 aus Kunststoff gebildet wird. Auch hier ist der bedeutsame Abstand « delta-x für den Bewegungsweg des (nicht dargestellten) Klappankers fest bestimmt. Der Hohlraum 5c ermöglicht ebenfalls eine günstige Wärmeabfuhr für einen thermisch hoch beanspruchten Nadeldruckkopf. Das Ausführugsbeispiel gemäß den Fig. 5 und 6 ist jedoch mehr auf eine « Nadelbank » bzw. auf eine « Hammerbank » gerichtet, wie solche üblicherweise für Zeilendrucker benutzt werden.According to a third exemplary embodiment (FIGS. 5 and 6), the hollow body 9 is approximately U-shaped as a rod and the U magnets 4 are glued or soldered to the likewise very thin-walled legs of the “U”. The common plane 5a for the end faces 5 results here, as does the stop or damping body 8, which is formed here from a strand 10 made of plastic. Here, too, the significant distance «delta-x for the movement path of the (not shown) hinged anchor determined. The cavity 5c also enables favorable heat dissipation for a thermally highly stressed wire print head. The exemplary embodiment according to FIGS. 5 and 6, however, is directed more towards a “needle bank” and a “hammer bank”, as are usually used for line printers.

Claims (4)

1. A wire printer head for dot matrix printers comprising a compound body which bears a plurality of pairs of pole shanks which form U-magnets and each of which is assigned a magnetic coil and a hinged armature, with bearing surfaces for the hinged armatures, which bearing surfaces are defined by the end faces of the pairs of pole shanks and are arranged in a common plane, with a plane-parallel central reference plane which is set back in relation to the bearing surface plane (by a distance delta-x) and which defines the stop means of the hinged armatures in the rest position, characterised in that the compound body comprises a hollow body (2; 7) which is U-shaped in cross-section, to the outer surface of which the U-magnets (4) are attached and at the end face of which there is formed either the reference plane (5b) or a retracted hub (7b) which accommodates a stop- and attenuating body (8) which itself forms the reference plane (5b).
2. A wire printer head as claimed in claim 1, characterised in that pocket-like recesses (3) are formed in the hollow body (2) so as to form the compound body with the U-magnets (4), and that the free flank ends of the U-shaped hollow body (2) are provided with a laterally projecting flange component in whose sides the respective recesses (3) are formed.
3. A wire printer head as claimed in claim 1 and claim 2, characterised in that the basic shape of the compound body is a polygon (7a) or an approximately U-shaped body (9) in the form of a rod.
4. A wire printer head as claimed in the claims 1 to 3, characterised in that the U-magnets (4) are attached to the outer periphery of the injection- moulded or cast hollow body (2) by adhesive- or solder connections.
EP83730096A 1982-11-22 1983-10-10 Needle printing head for a matrix printer Expired EP0112274B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823243476 DE3243476A1 (en) 1982-11-22 1982-11-22 NEEDLE PRINT HEAD FOR MATRIX PRINTER
DE3243476 1982-11-22

Publications (2)

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EP0112274A1 EP0112274A1 (en) 1984-06-27
EP0112274B1 true EP0112274B1 (en) 1989-06-07

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EP83730096A Expired EP0112274B1 (en) 1982-11-22 1983-10-10 Needle printing head for a matrix printer

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EP (1) EP0112274B1 (en)
DE (2) DE3243476A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105538720B (en) * 2016-01-22 2017-12-05 吴嘉馨 3D printing backing material shaped device based on magnetic flow liquid

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL159330B (en) * 1973-05-30 1979-02-15 Philips Nv MATRIX PUSHER.
US4230412A (en) * 1978-03-17 1980-10-28 Helmut Falk Matrix print head assembly
US4240756A (en) * 1978-07-26 1980-12-23 Ku Joseph P Optimized wire matrix impact print head
IT1099489B (en) * 1978-09-11 1985-09-18 Honeywell Inf Systems PERFECTED MATRIX PRINTER HEAD
JPS5637176A (en) * 1979-09-03 1981-04-10 Oki Electric Ind Co Ltd Printing head for dot printer
DE2947398A1 (en) * 1979-11-24 1981-05-27 Control Commerce AG, Ilanz, Graubünden Needle-type printing head - is in two mirror-image parts assembled together each with solenoids in semicircle
IT1128976B (en) * 1980-08-21 1986-06-04 Olivetti & Co Spa BALLISTIC WIRE PRINT HEAD
JPS57201669A (en) * 1981-06-04 1982-12-10 Tokyo Electric Co Ltd Printing head for dot printer

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DE3243476A1 (en) 1984-05-24
DE3380018D1 (en) 1989-07-13
DE3243476C2 (en) 1987-04-23
EP0112274A1 (en) 1984-06-27

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