EP0112274A1 - Needle printing head for a matrix printer - Google Patents

Needle printing head for a matrix printer Download PDF

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Publication number
EP0112274A1
EP0112274A1 EP83730096A EP83730096A EP0112274A1 EP 0112274 A1 EP0112274 A1 EP 0112274A1 EP 83730096 A EP83730096 A EP 83730096A EP 83730096 A EP83730096 A EP 83730096A EP 0112274 A1 EP0112274 A1 EP 0112274A1
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EP
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Prior art keywords
needle
yoke
coil
plane
print head
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EP83730096A
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German (de)
French (fr)
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EP0112274B1 (en
Inventor
Bernd Dipl.-Ing. Gugel
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Vodafone GmbH
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Mannesmann AG
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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
    • B41J2/275—Actuators for print wires of clapper type

Definitions

  • the invention relates to a wire dot print head for matrix printers with a coil carrier, which has a plurality of magnetic yokes, each of which has an electromagnetic coil and a magnet armature. are assigned, which rests with a lever arm at the rear end of the printing needle and with the front end of which pressure points can be generated on a record carrier by selective energization of the electromagnetic coils.
  • Such needle print heads operate on the hinged anchor principle, i.e. the magnetic armature lies more or less on the magnetic core (magnetic yoke) in a point or line shape. This contact surface is therefore insufficient and causes an electromagnetic low efficiency.
  • an incomplete support of the magnet armature 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 magnetic armature and that of the magnetic core and other parts are only examples of tolerance errors in needle print heads, which represent an undesirable deviation, which results in defects in the following areas: in the structure of the needle print head in the size of the needle print head, 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.
  • a needle printhead is known (DE-OS 30 31 855), with which the aim is to create a small printhead with a low power requirement and which is easy to manufacture and has a long service life.
  • a cylindrical permanent magnet, a first disk-shaped yoke and an annular second yoke essentially serve to solve this known task.
  • the upper surface of the second yoke is in the same plane as the upper surface of the cores of the electromagnets.
  • the common level is used to accommodate a disc with resilient magnetic anchor tongues.
  • 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 - coil carrier consists of a cast or injection-molded base body as a yoke carrier made of electrically non-conductive material, in which pocket-shaped recesses are arranged, in each of which a magnetic yoke made of magnetizable material is used.
  • This measure increases the quality of the print head considerably. It is namely possible to machine all yoke end faces in a single operation, that is to say with a single clamping of the workpiece, if such an operation at all is still required.
  • the yokes can either be pre-machined or placed so precisely in a casting or injection mold that the common yoke face is created without tolerance deviations.
  • the measure according to the invention also eliminates further deviations that were previously unavoidable in several clamping processes.
  • tolerances of 4 / 100th to 6 / 100th of a millimeter have so far been accepted, which led to different air gaps on the magnet armatures, so that the energization processes led 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 printing head in question is to be treated as a reject. Further advantages result from the simpler assembly of a needle print head equipped with the bobbin according to the invention.
  • a significant improvement of the known needle printheads is therefore that the yoke pieces form a common plane with their yoke end faces. As already stated, this .level can be obtained by the manufacturing process or by a single machining operation.
  • the coil carrier consists of a thin-walled bowl-shaped body, on the outer circumference of which the magnet yokes made of magnetizable material are attached.
  • a bowl-shaped body forms a body of revolution or, in its basic form, a polygonal body.
  • the coil carrier 1 is produced according to the first embodiment (FIGS. 1 and 2) from the cast or injection-molded base body 2 and serves as a yoke carrier.
  • the electromagnetic coils are not shown.
  • the material of the base body 2 consists of plastics, such as. B. polyamides.
  • In the base body 2 there are recesses 3 with the outer shape of the magnet yokes 4.
  • the magnet yokes 4 consist of ferritic materials and, with their yoke end faces 5, form a common plane 5 a, either by a single machining operation or by a precise position of the magnet yokes 4 during casting or molding.
  • the base body 2 is advantageously provided with a stop surface 5b which is deliberately related to the plane 5a and which stops the magnet armature during its backward movement.
  • the base body 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 front part of the needle print head housing, which is not shown further.
  • the coil carrier 6 consists of the thin-walled, shell-shaped body 7, which is also produced by casting or spraying.
  • the magnetic yokes 4 are fastened to the outer circumference of this likewise very light body 7 by adhesive or soldered connections.
  • the ferritic magnetic yokes 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 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 stop surface 5b of which is in relation to the common plane 5a, depending on the design features of the magnet armature.
  • the body 9 is approximately U-shaped as a rod and the magnet yokes 4 are glued or soldered to the also very thin-walled legs of the "U".
  • the common plane 5a for the yoke 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 path of movement of the magnet armature (not shown) is fixed.
  • the cavity 5c also enables favorable heat dissipation for a thermally highly stressed needle printhead.
  • the 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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Abstract

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).

Description

Die Erfindung betrifft einen Nadeldruckkopf für Matrixdrucker mit einem Spulenträger, der mehrere Magnetjoche aufweist, denen jeweils eine Elektromagnetspule und ein Magnetanker. zugeordnet sind, welcher mit einem Hebelarm an dem hinteren Ende der Drucknadel anliegt und mit deren vorderem Ende Druckpunkte auf einem Aufzeichnungsträger durch selektives Bestromen der Elektromagnetspulen erzeugbar sind.The invention relates to a wire dot print head for matrix printers with a coil carrier, which has a plurality of magnetic yokes, each of which has an electromagnetic coil and a magnet armature. are assigned, which rests with a lever arm at the rear end of the printing needle and with the front end of which pressure points can be generated on a record carrier by selective energization of the electromagnetic coils.

Derartige Nadeldruckköpfe arbeiten nach dem Klappankerprinzip, d.h. der Magnetanker liegt mehr oder weniger auf dem Magnetkern (Magnetjoch) punkt- oder linienförmig auf. Diese Auflagefläche ist daher unzureichend und verursacht einen elektromagnetisch niedrigen Wirkungsgrad. Eine unvollständige Auflage des Magnetankers führt jedoch auch bei mehreren Drucknadeln zu unterschied- lichen Druckkräften, so daß die Drucknadeln unterschiedliche Druckpunkte auf dem Aufzeichnungsträger erzeugen. Die Lagerung des Magnetankers und diejenige des Magnetkerns und weiterer Teile bilden nur Beispiele 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.Such needle print heads operate on the hinged anchor principle, i.e. the magnetic armature lies more or less on the magnetic core (magnetic yoke) in a point or line shape. This contact surface is therefore insufficient and causes an electromagnetic low efficiency. However, an incomplete support of the magnet armature 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 magnetic armature and that of the magnetic core and other parts are only examples of tolerance errors in needle print heads, which represent an undesirable deviation, which results in defects in the following areas: in the structure of the needle print head in the size of the needle print head, 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 vordergründig zwar 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 turns out to be an economic problem. However, even if only a partial fulfillment of sufficient tolerances in some of the above ranges, there is the technical problem of inadequate manufacturing accuracy with all its effects on the corresponding functional areas.

Es ist ein Nadeldruckkopf bekannt (DE-OS 30 31 855), mit dem angestrebt wird, einen kleinen Druckkopf zu schaffen mit einem geringen Leistungsbedarf und der einfach herstellbar.ist und eine lange Lebensdauer besitzt. Zur Lösung dieser bekannten Aufgabe dient im wesentlichen ein zylinderförmiger Permanentmagnet, ein erstes scheibenförmiges Joch und ein ringförmiges zweites Joch. Hierbei befindet sich die obere Fläche des zweiten Jochs in derselben Ebene wie die obere Fläche der Kerne der Elektromagnete. Die gemeinsame Ebene dient hier der Unterbringung einer Scheibe mit federnden Magnetanker-Zungen.A needle printhead is known (DE-OS 30 31 855), with which the aim is to create a small printhead with a low power requirement and which is easy to manufacture and has a long service life. A cylindrical permanent magnet, a first disk-shaped yoke and an annular second yoke essentially serve to solve this known task. Here, the upper surface of the second yoke is in the same plane as the upper surface of the cores of the electromagnets. The common level is used to accommodate a disc with resilient magnetic anchor tongues.

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.

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 erfindungsgemäß dadurch gelöst, daß der - Spulenträger aus einem gegossenen oder gespritzten Grundkörper als Jochträger aus elektrisch nichtleitendem Werkstoff besteht, in dem taschenförmige Ausnehmungen angeordnet sind, in denen jeweils ein Magnetjoch aus magnetisierbarem Werkstoff eingesetzt ist. Diese Maßnahme steigert die Qualität des Druckkopfes erheblich. Es wird nämlich ermöglicht, in einem einzigen Arbeitsgang, d. h. unter einmaligem Festspannen des Werkstückes sämtliche Jochstirnflächen zu bearbeiten, falls ein solcher Arbeitsgang überhaupt noch erforderlich wird. Die Joche können nämlich entweder vorbearbeitet sein oder aber so präzise in eine Guß- bzw. Spritzgußform eingelegt werden, daß die gemeinsame Jochstirnfläche ohne Toleranzabweichungen entsteht.The object is achieved in that the - coil carrier consists of a cast or injection-molded base body as a yoke carrier made of electrically non-conductive material, in which pocket-shaped recesses are arranged, in each of which a magnetic yoke made of magnetizable material is used. This measure increases the quality of the print head considerably. It is namely possible to machine all yoke end faces in a single operation, that is to say with a single clamping of the workpiece, if such an operation at all is still required. The yokes can either be pre-machined or placed so precisely in a casting or injection mold that the common yoke face is created without tolerance deviations.

Mit der erfindungsgemäßen Maßnahme entfallen außerdem weitere Abweichungen, die bei mehreren Einspannvorgängen bislang unvermeidbar waren. Bei Blechkonstruktionen sind bislang Toleranzen von 4/100stel bis 6/100stel Millimeter in Kauf genommen worden, die zu unterschiedlichen Luftspalten an den Magnetankern 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 Spulenträger ausgerüsteten Nadel druckkopfes.The measure according to the invention also eliminates further deviations that were previously unavoidable in several clamping processes. In sheet metal constructions, tolerances of 4 / 100th to 6 / 100th of a millimeter have so far been accepted, which led to different air gaps on the magnet armatures, so that the energization processes led 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 printing head in question is to be treated as a reject. Further advantages result from the simpler assembly of a needle print head equipped with the bobbin according to the invention.

Eine bedeutende Verbesserung der bekannten Nadeldruckköpfe besteht daher darin, daß die Jochstücke mit ihren Jochstirnflächen eine gemeinsame Ebene bilden. Diese .Ebene kann,wie bereits ausgeführt, durch den Herstellvorgang erhalten werden oder aber durch eine einmalige spanabhebende Bearbeitung.A significant improvement of the known needle printheads is therefore that the yoke pieces form a common plane with their yoke end faces. As already stated, this .level can be obtained by the manufacturing process or by a single machining operation.

Die gestellte Aufgabe wird bei einem gattungsgleichen Nadeldruck- kopf für Matrixdrucker ferner dadurch gelöst, daß der Spulenträger aus einem dünnwandigen schalenförmigen Körper besteht, an dessen Außenumfang die aus magnetisierbarem Werkstoff bestehenden Magnetjoche befestigt sind. Ein solcher schalenförmiger Körper bildet nach der weiteren Erfindung einen Rotationskörper oder in seiner Grundform einen Polygonalkörper. Die Vorteile dieser Lösung sind: Der Spulenträger weist"nur ein sehr geringes Gewicht auf, das im wesentlichen noch durch die Magnetjoche bestimmt wird. Eine Bearbeitung der Jochstirnflächen kann auch hier bei entsprechend vorbereiteten Magnetjochen eingespart werden, indem die Jochstücke einzeln auf einer rotierenden Herstellmaschine an dem schalenförmigen Körper durch entsprechende Verbindungsvorgänge, wie beispielsweise durch Kleben befestigt werden.The object is also achieved in a generic needle print head for matrix printers in that the coil carrier consists of a thin-walled bowl-shaped body, on the outer circumference of which the magnet yokes made of magnetizable material are attached. According to the further invention, such a bowl-shaped body forms a body of revolution or, in its basic form, a polygonal body. The advantages of this solution are: The coil carrier has "only a very low weight, which is essentially determined by the magnetic yokes Machining of the yoke end faces can also be saved here in the case of appropriately prepared magnetic yokes, in that the yoke pieces are individually attached to the bowl-shaped body on a rotating manufacturing machine by means of corresponding connection processes, such as, for example, by gluing.

Mehrere Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im folgenden näher beschrieben. Es zeigen

  • 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.
Several embodiments of the invention are shown in the drawing and are described in more detail below. Show it
  • 1 shows an axial cross section through the coil carrier of a first exemplary 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 Grundkörper 2 hergestellt und dient als Jochträger. Die Elektromagnetspulen sind nicht gezeichnet. Der Werkstoff des Grundkörpers 2 besteht aus Kunststoffen, wie z. B. Polyamiden. In dem Grundkörper 2 befinden sich Ausnehmungen 3 mit der äußeren Form der Magnetjoche 4. Die Magnetjoche 4 bestehen aus ferritischen Werkstoffen und bilden mit ihren Jochstirnflächen 5 eine gemeinsame Ebene 5a, die entweder durch ein einmaliges Bearbeiten oder durch eine präzise Lage der Magnetjoche 4 beim Umgießen oder Umspritzen entsteht.The coil carrier 1 is produced according to the first embodiment (FIGS. 1 and 2) from the cast or injection-molded base body 2 and serves as a yoke carrier. The electromagnetic coils are not shown. The material of the base body 2 consists of plastics, such as. B. polyamides. In the base body 2 there are recesses 3 with the outer shape of the magnet yokes 4. The magnet yokes 4 consist of ferritic materials and, with their yoke end faces 5, form a common plane 5 a, either by a single machining operation or by a precise position of the magnet yokes 4 during casting or molding.

Der Grundkörper 2 ist vorteilhaft mit einer Anschlagfläche 5b versehen, die in einem gewollten Bezug zur Ebene 5a steht und die die Magnetanker bei ihrer Rückwärtsbewegung abstoppt. Der Grundkörper 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 Vorderteil des Nadeldruckkopfgehäuses.The base body 2 is advantageously provided with a stop surface 5b which is deliberately related to the plane 5a and which stops the magnet armature during its backward movement. The base body 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 front part of the needle print head housing, which is not shown further.

Der Spulenträger 6 besteht gemäß dem zweiten Ausführungsbeispiel (Fig. 3 und 4) aus dem dünnwandigen, schalenförmigen Körper 7, der ebenfalls durch Gießen oder Spritzen hergestellt wird. Am Außenumfang dieses ebenfalls sehr leichten Körpers 7 sind die Magnetjoche 4 durch Klebe- oder Lötverbindungen befestigt. Die ferritischen Magnetjoche 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 Körpers 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 Anschlagfläche 5b in bezug zur gemeinsamen Ebene 5a je nach den Konstruktionsmerkmalen der Magnetanker steht.According to the second exemplary embodiment (FIGS. 3 and 4), the coil carrier 6 consists of the thin-walled, shell-shaped body 7, which is also produced by casting or spraying. The magnetic yokes 4 are fastened to the outer circumference of this likewise very light body 7 by adhesive or soldered connections. The ferritic magnetic yokes 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 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 stop surface 5b of which is in relation to the common plane 5a, depending on the design features of the magnet armature.

Nach einem dritten Ausführungsbeispiel (Fig. 5 und 6) ist der Körper 9 etwa U-förmig als Stab gebildet und die Magnetjoche 4 sind an den ebenfalls sehr dünnwandigen Schenkeln des "U" angeklebt oder angelötet. Die gemeinsame Ebene 5a für die Jochstirnflächen 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) Magnetankers fest bestimmt. Der Hohlraum 5c ermöglicht ebenfalls eine günstige Wärmeabfuhr für'einen thermisch hoch beanspruchten Nadeldruckkopf. Das Ausführungsbeispiel 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 embodiment (FIGS. 5 and 6), the body 9 is approximately U-shaped as a rod and the magnet yokes 4 are glued or soldered to the also very thin-walled legs of the "U". The common plane 5a for the yoke 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 path of movement of the magnet armature (not shown) is fixed. The cavity 5c also enables favorable heat dissipation for a thermally highly stressed needle printhead. The The 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. Nadeldruckkopf für Matrixdrucker mit einem Spulenträger, der mehrere Magnetjoche aufweist, denen jeweils eine Elektromagnetspule und ein Magnetanker zugeordnet sind, welcher mit einem Hebelarm an dem hinteren Ende der Drucknadel anliegt und mit deren vorderem Ende Druckpunkte auf einem Aufzeichnungsträger durch selektives Bestromen der Elektromagnetspulen erzeugbar, sind,
dadurch gekennzeichnet,
daß der Spulenträger (1) aus einem gegossenen oder gespritzten Grundkörper (2).als Jochträger aus elektrisch nichtleitendem Werkstoff besteht, in dem taschenförmige Ausnehmungen (3) angeordnet sind, in denen jeweils ein Magnetjoch (4) aus magnetisierbarem Werkstoff eingesetzt ist.1. Needle print head for matrix printers with a coil carrier, which has a plurality of magnetic yokes, each of which is assigned an electromagnetic coil and a magnet armature, which rests with a lever arm on the rear end of the printing needle and with the front end of which pressure points can be generated on a recording medium by selective energization of the electromagnetic coils , are,
characterized,
that the coil carrier (1) consists of a cast or injection-molded base body (2). As a yoke carrier made of electrically non-conductive material, in which pocket-shaped recesses (3) are arranged, in each of which a magnetic yoke (4) made of magnetizable material is inserted. 2. Nadeldruckkopf gemäß Anspruch 1,
dadurch gekennzeichnet,
daß die Jochstücke (4) mit ihren Jochstirnflächen (5) eine . gemeinsame Ebene (5a) bilden.2. needle printhead according to claim 1,
characterized,
that the yoke pieces (4) with their yoke end faces (5) one. form common level (5a). 3. Nadeldruckkopf für Matrixdrucker, mit einem Spulenträger, der mehrere Magnetjoche aufweist, denen jeweils eine Elektromagnetspule und ein Magnetanker zugeordnet sind, welcher mit einem Hebelarm an dem hinteren Ende der Drucknadel anliegt und mit deren vorderem Ende Druckpunkte auf einem Aufzeichnungsträger durch selektives Bestromen der Elektromagnetspulen erzeugbar sind,
dadurch gekennzeichnet,
daß der Spulenträger (6) aus einem dünnwandigen, schalenförmigen Körper (7 bzw. 9) besteht, an dessen Außenumfang die aus magneti- sierbarem Werkstoff bestehenden Magnetjoche (4) befestigt sind.3. Needle print head for matrix printers, with a coil carrier that has several magnetic yokes, each of which is assigned an electromagnetic coil and a magnet armature, which rests with a lever arm on the rear end of the printing needle and with its front end pressure points on a recording medium by selective energization of the electromagnetic coils can be generated,
characterized,
that the coil support (6) (7 or 9) consists of a thin-walled, cup-shaped body on whose outer circumference of the magneti - sierbarem material existing magnetic yokes (4) are attached. 4. Nadeldruckkopf gemäß Anspruch 3,
dadurch gekennzeichnet,
daß der schalenförmige Körper (7) einen Rotationskörper oder in seiner Grundform einen Polygonalkörper (7a) bildet.4. needle printhead according to claim 3,
characterized,
that the bowl-shaped body (7) forms a rotating body or in its basic form a polygonal body (7a).
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
DE3243476 1982-11-22
DE3243476A DE3243476C2 (en) 1982-11-22 1982-11-22 Needle print head for matrix printer

Publications (2)

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

Family

ID=6178919

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83730096A Expired EP0112274B1 (en) 1982-11-22 1983-10-10 Needle printing head for a matrix printer

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Country Link
EP (1) EP0112274B1 (en)
DE (2) DE3243476C2 (en)

Families Citing this family (1)

* 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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3031855A1 (en) 1979-09-03 1981-03-12 Nippon Telegraph & Telephone Public Corp. PRINT HEAD.
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
EP0067542A1 (en) * 1981-06-04 1982-12-22 Tokyo Electric Co. Ltd. Printing head of dot printer

Family Cites Families (5)

* 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
IT1128976B (en) * 1980-08-21 1986-06-04 Olivetti & Co Spa BALLISTIC WIRE PRINT HEAD

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3031855A1 (en) 1979-09-03 1981-03-12 Nippon Telegraph & Telephone Public Corp. PRINT HEAD.
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
EP0067542A1 (en) * 1981-06-04 1982-12-22 Tokyo Electric Co. Ltd. Printing head of dot printer

Also Published As

Publication number Publication date
EP0112274B1 (en) 1989-06-07
DE3243476A1 (en) 1984-05-24
DE3243476C2 (en) 1987-04-23
DE3380018D1 (en) 1989-07-13

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