EP0462684A1 - Needle matrix print head - Google Patents

Needle matrix print head Download PDF

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Publication number
EP0462684A1
EP0462684A1 EP91250115A EP91250115A EP0462684A1 EP 0462684 A1 EP0462684 A1 EP 0462684A1 EP 91250115 A EP91250115 A EP 91250115A EP 91250115 A EP91250115 A EP 91250115A EP 0462684 A1 EP0462684 A1 EP 0462684A1
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EP
European Patent Office
Prior art keywords
mouthpiece
guide
matrix
needle
magnetic
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.)
Granted
Application number
EP91250115A
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German (de)
French (fr)
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EP0462684B1 (en
Inventor
Johann Stempfle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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Publication date
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Publication of EP0462684A1 publication Critical patent/EP0462684A1/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
    • B41J2/235—Print head assemblies
    • B41J2/25—Print wires
    • B41J2/255—Arrangement of the print ends of the wires
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
    • B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
    • B41J2/235—Print head assemblies
    • B41J2/265—Guides for print wires

Definitions

  • the invention relates to a matrix needle printhead with a plurality of printing needles, the rear end of which is assigned an electromagnetic drive for longitudinal movements of the printing needles in order to generate printing dots on a recording medium, and the front ends of which are columns or rows in a reciprocating or moving up and down movement Form guide mouthpiece, wherein a lifting magnet device is provided for two defined end positions of a magnet armature.
  • Matrix dot print heads of this type are used for a higher resolution of pressure dots in a matrix system and thus for writing fine writing in addition to writing quick writing.
  • a printhead provided with two parallel needle gaps is rotated about a central longitudinal axis running approximately parallel to the printing needles, whereby printing needles of the one needle column pressure points between the pressure points of the moving Print the needle gap, whereby the pressure dots are also printed overlapping.
  • the second design is as follows: One of the two needle gaps is positioned relative to the other needle gap, e.g. to half the needle spacing.
  • the present invention relates to the displacement of one needle gap relative to the other, that is to say the second design. It is also possible to print with just one (displaceable) needle gap, but at least two print passes per cell are then required, so that the print head works more slowly.
  • Needle gap adjusting devices based on lifting magnets are known (EP 0 314 851; DE 35 40 761; DE 34 12 856; DE 34 12 854; DE 34 03 795; DE 26 60 934; EP 05 20 66; US 4,640,633).
  • the well-known Solutions take up a relatively large amount of space because they usually use very long lever arms to which the guide mouthpiece is attached.
  • the known large moving masses require correspondingly high switching forces and restoring forces, which are usually generated on the basis of a spring force.
  • the invention is therefore based on the object of proposing such needle gap adjusting devices with a smaller installation space required and with low switching forces.
  • the lifting magnet device is arranged or fastened overall in a region directly to the guide mouthpiece and has a magnetic yoke with two or more magnetic poles, an armature body being switched on or off between the coordinated distance of two magnetic poles of the same name or can be moved back and forth or moved up and down by reversing the polarity of the switched-on solenoid coil, and the guide mouthpiece is fastened to the guided armature body.
  • the advantages of this are a small size of the entire lifting magnet device, so that it can be attached to the left or right of the print head without greatly impairing the user's view of the printed text.
  • precise, definable end positions of the guide mouthpiece are guaranteed and only small switching forces are required to operate the system.
  • the system is also extremely reliable in terms of adjustment, because the distance between two magnetic poles of the same name can be machined to the exact tolerance.
  • the matrix needle printhead according to the invention can be built spatially so compact and small that the lifting magnet device is arranged overall within a matrix print head housing between the foremost printing needle guide bearing and the guide mouthpiece.
  • the lifting magnet device has an E-shaped yoke, the central yoke leg of which carries the lifting magnet coil. This measure also supports better use of space.
  • the magnetic fluxes are advantageously conducted.
  • a further advantageous embodiment consists in the armature body of the lifting magnet device being provided with a permanent magnet, the lifting magnet coil being able to be reversed.
  • the electrical polarity reversal requires very low switching forces, whereby resetting forces due to mechanical springs can be completely dispensed with here.
  • only a slight self-heating of the solenoid takes place in the event of a mere reversal of polarity, so that a high number of switching operations (switching frequency) can be applied.
  • a mouthpiece carrier is articulated to the magnetic yoke.
  • This component also adapts to the magnetic yoke in its outer shape and therefore does not take up space nor does the transport weight of the matrix needle print head increase significantly.
  • a mouthpiece carrier has at least two parallel arms which are articulated to a rocker and to the magnetic yoke, the rocker being rigidly connected to the anchor body and to the guide mouthpiece.
  • This rocker allows the anchor body with a guide mouthpiece without Move overcoming restoring forces between the magnetic poles of the magnetic yoke of the same name.
  • the mouthpiece carrier is in one piece, consists of elastic material and the articulation points are formed from so-called film hinges. In the sense of a parallelogram, this solution enables the guide mouthpiece to be adjusted absolutely free of bends.
  • the mouthpiece is glued into the mouthpiece carrier. This allows the adjustable needle gap to be aligned with the other printhead parts, e.g. to a second fixed needle gap.
  • a matrix needle print head 1 is perpendicular to the drawing plane in front of one Printing abutment 2 of a matrix printer moves back and forth and generates 4 printing dots, characters, graphics, images, etc. on a recording medium 4a by means of printing needles 3 via an ink ribbon.
  • the matrix needle print head 1 essentially consists of an electromagnet drive 5 arranged in the rear area, each with an armature 6, each of which drives a pressure needle 3, which is pressed permanently with its rear end 3a by a return spring 7 onto the armature 6.
  • the printing needles 2 are guided in a plurality of printing needle guide bearings 8 and their front ends 3b form vertical columns 3c or oblique rows in a guide mouthpiece 9. At least one of the columns 3c is adjustable in height.
  • a lifting magnet device 10 with a magnet armature 11 is used, which can be adjusted into an upper and a lower end position.
  • the entire lifting magnet device 10 is fastened with two screws 12 and 13 to a matrix print head housing 14, which encloses the printing needles 3 on three sides (FIG. 1).
  • the lifting magnet device 10 is arranged overall in close proximity to the guide mouthpiece 9 in order to create particularly short connecting pieces between the magnet armature 11 and guide mouthpiece 9.
  • This immediate area 15 can be located at the top, bottom, left or right of the guide mouthpiece 9 on the matrix print head housing 14 or - as drawn - in an interior 16.
  • the lifting magnet device 10 also has a magnetic yoke 17 which forms magnetic poles 18 and 19.
  • the magnetic poles 18 and 19 are produced by machine at a distance 20 within which they are matched to the movement path of the guide mouthpiece 9 Can move anchor body 21 and thereby moves the guide mouthpiece 9, while a second guide mouthpiece 9a ( Figure 3a) is immovably arranged.
  • the armature body 21 can move back and forth or up and down by switching on or off or by reversing the polarity of a switched-on solenoid 22, the guide mouthpiece 9 being fastened to the armature body 21.
  • the lifting magnet device 10 can be made so small and compact that it can be arranged overall within the interior 16 of the matrix print head housing 14 between the foremost pressure needle guide bearing 8 and the guide mouthpiece 9.
  • One of the special structural features of the lifting magnet device 10 is an E-shaped yoke 23, the central yoke leg 24 of which carries the lifting magnet coil 22.
  • the anchor body 21 can consist of a one-piece piece of soft iron. However, it can also be structured, with a permanent magnet 25 being provided as the central part (FIG. 3a). If the permanent magnet 25 is used, the solenoid 22 is to be switched to reverse polarity.
  • a mouthpiece carrier 26 is fastened in an articulated manner to the magnetic yoke 17.
  • the mouthpiece carrier 26 has two parallel arms 26a and 26b and a rocker arm 26c articulated thereto.
  • the arms 26a and 26b are also articulated to the magnetic yoke 17 and the rocker 26c is immovably connected to the armature body 21 and to the guide mouthpiece 9, respectively.
  • the mouthpiece support 26 is made in one piece from plastic that can be plasticized and is therefore elastic enough to make articulation points 27 to form so-called film hinges 27c.
  • the guide mouthpiece 9 is glued into the mouthpiece support 26 by means of adhesives 28, so that (FIGS. 3a and 3b) an alignment can take place between the first guide mouthpiece 9 and the second guide mouthpiece 9a.
  • a mechanical spring (not shown) is advantageously to be provided for the return to the defined end position.

Landscapes

  • Impact Printers (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Facsimile Scanning Arrangements (AREA)

Abstract

In a matrix needle printhead (1), in each case electromagnetic drives (5) are provided for each print needle (3) for longitudinal movements and in order to produce guide mouthpieces (9) which can be moved backwards and forwards and up and down for high-speed or letter quality printing, a lifting magnetic device (10) serving for two defined limit positions of a magnetic armature (11). <??>In order to accommodate the lifting magnetic device in the smallest possible space, that is to say compactly, and to improve the switching frequency, it is proposed that the lifting magnetic device (10) be arranged and mounted in its entirety in a region (15) which is immediate with respect to the guide mouthpiece (9) and has a magnetic yoke (17) with two or more magnetic poles (18, 19), it being possible to move an armature body (21) backwards and forwards or up and down between the matching distance (20) of two magnetic poles (18, 19) of different polarity, by switching on and off or by reversing the polarity of the switched-on lifting magnetic coil (22) and the guide mouthpiece (9) being mounted on the guided armature body (21). <IMAGE>

Description

Die Erfindung betrifft einen Matrixnadeldruckkopf mit mehreren Drucknadeln, deren hinterem Ende jeweils ein Elektromagnetantrieb für Längsbewegungen der Drucknadeln zugeordnet ist, um auf einem Aufzeichnungsträger Druckpunkte zu erzeugen, und deren vordere Enden jeweils Spalten oder Reihen in einem hin- und herbewegbaren bzw. auf- und abbewegbaren Führungsmundstück bilden, wobei eine Hubmagnetvorrichtung für zwei definierte Endstellungen eines Magnetankers vorgesehen ist.The invention relates to a matrix needle printhead with a plurality of printing needles, the rear end of which is assigned an electromagnetic drive for longitudinal movements of the printing needles in order to generate printing dots on a recording medium, and the front ends of which are columns or rows in a reciprocating or moving up and down movement Form guide mouthpiece, wherein a lifting magnet device is provided for two defined end positions of a magnet armature.

Derartige Matrixnadeldruckköpfe dienen einer höheren Auflösung von Druckpunkten in einem Matrixsystem und somit zum Schreiben von Schönschrift neben dem Schreiben von Schnellschrift.Matrix dot print heads of this type are used for a higher resolution of pressure dots in a matrix system and thus for writing fine writing in addition to writing quick writing.

Grundsätzlich sind für das abwechselnde Schönschrift-Schnellschrift-Schreiben zwei nebeneinander existierende Gestaltungen bekannt: Ein mit zwei parallelen Nadelspalten versehener Druckkopf wird um eine etwa parallel zu den Drucknadeln verlaufende Mittel-Längs-Achse gedreht, wodurch Drucknadeln der einen Nadelspalte Druckpunkte zwischen die Druckpunkte der vorausbewegten Nadelspalte drucken, wobei die Druckpunkte auch überlappend gedruckt werden. Die zweite Bauweise ist wie folgt gestaltet: Eine der beiden Nadelspalten wird relativ zur anderen Nadelspalte, z.B. auf den halben Nadelabstand, verschoben. Die vorliegende Erfindung betrifft das Verschieben der einen Nadelspalte gegenüber der anderen, also die zweite Gestaltungsweise. Es ist auch möglich mit nur einer (verschiebbaren) Nadelspalte zu drucken, jedoch sind dann zumindest zwei Druckpässe pro Zelle erforderlich, so daß der Druckkopf langsamer arbeitet.Basically two alternate designs are known for the alternating fine writing and quick writing: A printhead provided with two parallel needle gaps is rotated about a central longitudinal axis running approximately parallel to the printing needles, whereby printing needles of the one needle column pressure points between the pressure points of the moving Print the needle gap, whereby the pressure dots are also printed overlapping. The second design is as follows: One of the two needle gaps is positioned relative to the other needle gap, e.g. to half the needle spacing. The present invention relates to the displacement of one needle gap relative to the other, that is to say the second design. It is also possible to print with just one (displaceable) needle gap, but at least two print passes per cell are then required, so that the print head works more slowly.

Auf Hubmagneten aufbauende Nadelspalten-Verstelleinrichtungen sind bekannt (EP 0 314 851; DE 35 40 761; DE 34 12 856; DE 34 12 854; DE 34 03 795; DE 26 60 934; EP 05 20 66; US 4,640,633). Die bekannten Lösungen nehmen relativ großen Raum ein, weil sie sich meist sehr langer Hebelarme bedienen, an denen das Führungsmundstück befestigt ist. Andererseits bedingen die bekannterweise großen bewegten Massen entsprechend hohe Schaltkräfte sowie Rückstellkräfte, die meist auf der Grundlage einer Federkraft erzeugt werden.Needle gap adjusting devices based on lifting magnets are known (EP 0 314 851; DE 35 40 761; DE 34 12 856; DE 34 12 854; DE 34 03 795; DE 26 60 934; EP 05 20 66; US 4,640,633). The well-known Solutions take up a relatively large amount of space because they usually use very long lever arms to which the guide mouthpiece is attached. On the other hand, the known large moving masses require correspondingly high switching forces and restoring forces, which are usually generated on the basis of a spring force.

Der Erfindung liegt daher die Aufgabe zugrunde, derartige Nadelspalten-Verstelleinrichtungen mit einem kleineren benötigten Bauraum und mit geringen Schaltkräften vorzuschlagen.The invention is therefore based on the object of proposing such needle gap adjusting devices with a smaller installation space required and with low switching forces.

Die gestellte Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Hubmagnetvorrichtung insgesamt in einem zum Führungsmundstück unmittelbaren Bereich angeordnet bzw. befestigt ist und ein Magnetjoch mit zwei oder mehr Magnetpolen aufweist, wobei zwischen dem abgestimmten Abstand von zwei ungleichnamigen Magnetpolen ein Ankerkörper durch Ein- oder Ausschalten oder durch Umpolen der eingeschalteten Hubmagnetspule hin- und herbewegbar bzw. auf- und abbewegbar ist und wobei das Führungsmundstück an dem geführten Ankerkörper befestigt ist. Die Vorteile davon sind eine geringe Baugröße der gesamten Hubmagnetvorrichtung, so daß diese ohne große Beeinträchtigung der Einsichtnahme des Benutzers auf den gedruckten Text auch auf, links oder rechts des Druckkopfes angebracht werden kann. Ferner sind genau, bestimmbare Endlagen des Führungsmundstückes gewährleistet und für die Betätigung des Systems sind nur geringe Schaltkräfte erforderlich. Das System ist jedoch zusätzlich von äußerst hoher Verstellsicherheit, weil der Abstand von zwei ungleichnamigen Magnetpolen durch maschinelle Bearbeitung toleranzgenau hergestellt werden kann.The object is achieved according to the invention in that the lifting magnet device is arranged or fastened overall in a region directly to the guide mouthpiece and has a magnetic yoke with two or more magnetic poles, an armature body being switched on or off between the coordinated distance of two magnetic poles of the same name or can be moved back and forth or moved up and down by reversing the polarity of the switched-on solenoid coil, and the guide mouthpiece is fastened to the guided armature body. The advantages of this are a small size of the entire lifting magnet device, so that it can be attached to the left or right of the print head without greatly impairing the user's view of the printed text. Furthermore, precise, definable end positions of the guide mouthpiece are guaranteed and only small switching forces are required to operate the system. However, the system is also extremely reliable in terms of adjustment, because the distance between two magnetic poles of the same name can be machined to the exact tolerance.

Der erfindungsgemäße Matrixnadeldruckkopf kann jedoch räumlich derart kompakt und klein gebaut werden, derart, daß die Hubmagnetvorrichtung insgesamt innerhalb eines Matrixdruckkopfgehäuses zwischen dem vordersten Drucknadelführungslager und dem Führungsmundstück angeordnet ist.However, the matrix needle printhead according to the invention can be built spatially so compact and small that the lifting magnet device is arranged overall within a matrix print head housing between the foremost printing needle guide bearing and the guide mouthpiece.

Nach anderen vorteilhaften Merkmalen ist vorgesehen, daß die Hubmagnetvorrichtung ein E-förmiges Joch aufweist, dessen mittlerer Jochschenkel die Hubmagnetspule trägt. Somit unterstützt auch diese Maßnahme eine bessere Raumausnutzung. Außerdem werden die Magnetflüsse vorteilhaft geleitet.According to other advantageous features, it is provided that the lifting magnet device has an E-shaped yoke, the central yoke leg of which carries the lifting magnet coil. This measure also supports better use of space. In addition, the magnetic fluxes are advantageously conducted.

Eine weitere vorteilhafte Ausgestaltung besteht darin, daß der Ankerkörper der Hubmagnetvorrichtung mit einem Dauermagneten versehen ist, wobei die Hubmagnetspule umpolbar ist. Die elektrische Umpolung benötigt ganz geringe Schaltkräfte, wobei hier auf Rückstellkräfte durch mechanische Federn völlig verzichtet werden kann. Außerdem findet beim bloßen Umpolen nur eine geringe Eigenerwärmung der Hubmagnetspule statt, so daß eine hohe Schaltzahl (Schaltfrequenz) angesetzt werden kann.A further advantageous embodiment consists in the armature body of the lifting magnet device being provided with a permanent magnet, the lifting magnet coil being able to be reversed. The electrical polarity reversal requires very low switching forces, whereby resetting forces due to mechanical springs can be completely dispensed with here. In addition, only a slight self-heating of the solenoid takes place in the event of a mere reversal of polarity, so that a high number of switching operations (switching frequency) can be applied.

Ein zusätzliches Merkmal der Erfindung besteht darin, daß an dem Magnetjoch ein Mundstückträger gelenkig befestigt ist. Auch dieser Bauteil paßt sich dem Magnetjoch in der äußeren Form an und nimmt daher weder Raum ein noch erhöht sich das Transportgewicht des Matrixnadeldruckkopfes wesentlich.An additional feature of the invention is that a mouthpiece carrier is articulated to the magnetic yoke. This component also adapts to the magnetic yoke in its outer shape and therefore does not take up space nor does the transport weight of the matrix needle print head increase significantly.

Der Gedanke eines Mundstückträgers wird außerdem dadurch weiterentwickelt, daß der Mundstückträger zumindest zwei parallel verlaufende Arme aufweist, die gelenkig an einer Schwinge und an dem Magnetjoch befestigt sind, wobei die Schwinge mit dem Ankerkörper und mit dem Führungsmundstück jeweils starr verbunden ist. Durch diese Schwinge kann sich der Ankerkörper mit Führungsmundstück ohne Überwindung von Rückstellkräften zwischen den ungleichnamigen Magnetpolen des Magnetjoches bewegen.The idea of a mouthpiece carrier is further developed in that the mouthpiece carrier has at least two parallel arms which are articulated to a rocker and to the magnetic yoke, the rocker being rigidly connected to the anchor body and to the guide mouthpiece. This rocker allows the anchor body with a guide mouthpiece without Move overcoming restoring forces between the magnetic poles of the magnetic yoke of the same name.

Eine andere Verbesserung der Erfindung besteht darin, daß der Mundstückträger einstückig ist, aus elastischem Werkstoff besteht und die Gelenkstellen aus sogenannten Filmscharnieren gebildet sind. Diese Lösung ermöglicht im Sinne eines Parallelogramms eine absolute bogenfreie Verstellung des Führungsmundstücks.Another improvement of the invention is that the mouthpiece carrier is in one piece, consists of elastic material and the articulation points are formed from so-called film hinges. In the sense of a parallelogram, this solution enables the guide mouthpiece to be adjusted absolutely free of bends.

Schließlich ist vorgesehen, daß das Mundstück in den Mundstückträger eingeklebt ist. Dadurch kann bei der Montage der Hubmagnetvorrichtung eine Ausrichtung der verstellbaren Nadelspalte zu den übrigen Druckkopfteilen, wie z.B. zu einer zweiten feststehenden Nadelspalte, erfolgen.Finally, it is provided that the mouthpiece is glued into the mouthpiece carrier. This allows the adjustable needle gap to be aligned with the other printhead parts, e.g. to a second fixed needle gap.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung schematisch dargestellt und wird nachfolgend näher erläutert. Es zeigen:

  • Figur 1 einen axialen Längsschnitt durch einen Matrixnadeldruckkopf mit der Hubmagnetvorrichtung,
  • Figur 2 den vorderen Teil des in Figur 1 dargestellten axialen Längsschnitts in vergrößertem Maßstab,
  • Figur 3a eine perspektivische Teilschnitt-Darstellung der Hubmagnetvorrichtung und
  • Figur 3b einen Horizontalschnitt A-B gemäß Figur 2 durch die Hubmagnetvorrichtung.
In the drawing, an embodiment of the invention is shown schematically and is explained in more detail below. Show it:
  • FIG. 1 shows an axial longitudinal section through a matrix needle print head with the lifting magnet device,
  • FIG. 2 shows the front part of the axial longitudinal section shown in FIG. 1 on an enlarged scale,
  • Figure 3a is a perspective partial sectional view of the lifting magnet device and
  • 3b shows a horizontal section AB according to FIG. 2 through the lifting magnet device.

Ein Matrixnadeldruckkopf 1 wird senkrecht zur Zeichenebene vor einem Druckwiderlager 2 eines Matrixdruckers hin- und herbewegt und erzeugt mittels Drucknadeln 3 über ein Farbband 4 Druckpunkte, Schriftzeichen, graphische Darstellungen, Bilder usw. auf einem Aufzeichnungsträger 4a.A matrix needle print head 1 is perpendicular to the drawing plane in front of one Printing abutment 2 of a matrix printer moves back and forth and generates 4 printing dots, characters, graphics, images, etc. on a recording medium 4a by means of printing needles 3 via an ink ribbon.

Der Matrixnadeldruckkopf 1 besteht im wesentlichen aus einem im rückwärtigen Bereich angeordneten Elektromagnetantrieb 5 mit jeweils einem Anker 6, der jeweils eine Drucknadel 3 antreibt, die mit ihrem hinteren Ende 3a durch eine Rückstellfeder 7 dauernd an den Anker 6 angedrückt wird.The matrix needle print head 1 essentially consists of an electromagnet drive 5 arranged in the rear area, each with an armature 6, each of which drives a pressure needle 3, which is pressed permanently with its rear end 3a by a return spring 7 onto the armature 6.

In einem vorderen Bereich des Matrixnadeldruckkopfes 1 werden die Drucknadeln 2 in mehreren Drucknadelführungslagern 8 geführt und ihre vorderen Enden 3b bilden in einem Führungsmundstück 9 senkrechte Spalten 3c oder schräge Reihen. Zumindest eine der Spalten 3c ist höhenverstellbar. Hierzu dient eine Hubmagnetvorrichtung 10 mit einem Magnetanker 11, der in eine obere und eine untere Endstellung verstellbar ist. Die gesamte Hubmagnetvorrichtung 10 ist mit zwei Schrauben 12 und 13 an einem Matrixdruckkopfgehäuse 14, das die Drucknadeln 3 an drei Seiten umschließt, befestigt (Figur 1).In a front area of the matrix needle print head 1, the printing needles 2 are guided in a plurality of printing needle guide bearings 8 and their front ends 3b form vertical columns 3c or oblique rows in a guide mouthpiece 9. At least one of the columns 3c is adjustable in height. For this purpose, a lifting magnet device 10 with a magnet armature 11 is used, which can be adjusted into an upper and a lower end position. The entire lifting magnet device 10 is fastened with two screws 12 and 13 to a matrix print head housing 14, which encloses the printing needles 3 on three sides (FIG. 1).

Die Hubmagnetvorrichtung 10 ist insgesamt in nächster Nähe zum Führungsmundstück 9 angeordnet, um besonders kurze Verbindungsstücke zwischen Magnetanker 11 und Führungsmundstück 9 zu schaffen. Dieser unmittelbare Bereich 15 kann sich oben, unten, links oder rechts vom Führungsmundstück 9 am Matrixdruckkopfgehäuse 14 befinden oder auch - wie gezeichnet - in einem Innenraum 16.The lifting magnet device 10 is arranged overall in close proximity to the guide mouthpiece 9 in order to create particularly short connecting pieces between the magnet armature 11 and guide mouthpiece 9. This immediate area 15 can be located at the top, bottom, left or right of the guide mouthpiece 9 on the matrix print head housing 14 or - as drawn - in an interior 16.

Die Hubmagnetvorrichtung 10 weist ferner ein Magnetjoch 17 auf, das Magnetpole 18 und 19 bildet. Die Magnetpole 18 und 19 befinden sich maschinell hergestellt in einem auf den Bewegungsweg des Führungsmundstückes 9 abgestimmten Abstand 20 innerhalb dessen sich ein Ankerkörper 21 bewegen kann und dadurch das Führungsmundstück 9 bewegt, währenddem ein zweites Führungsmundstück 9a (Figur 3a) unbeweglich angeordnet ist.The lifting magnet device 10 also has a magnetic yoke 17 which forms magnetic poles 18 and 19. The magnetic poles 18 and 19 are produced by machine at a distance 20 within which they are matched to the movement path of the guide mouthpiece 9 Can move anchor body 21 and thereby moves the guide mouthpiece 9, while a second guide mouthpiece 9a (Figure 3a) is immovably arranged.

Der Ankerkörper 21 kann sich durch Ein-, oder Ausschalten oder durch Umpolen einer eingeschalteten Hubmagnetspule 22 hin- und herbewegen bzw. auf- und abbewegen, wobei das Führungsmundstück 9 an dem Ankerkörper 21 befestigt ist.The armature body 21 can move back and forth or up and down by switching on or off or by reversing the polarity of a switched-on solenoid 22, the guide mouthpiece 9 being fastened to the armature body 21.

Die Hubmagnetvorrichtung 10 kann derart klein und kompakt ausgeführt sein, daß sie insgesamt innerhalb des Innenraums 16 des Matrixdruckkopfgehäuses 14 zwischen dem vordersten Drucknadelführungslager 8 und dem Führungsmundstück 9 angeordnet werden kann. Eines der besonderen baulichen Merkmale der Hubmagnetvorrichtung 10 stellt ein E-förmiges Joch 23 dar, dessen mittlerer Jochschenkel 24 die Hubmagnetspule 22 trägt.The lifting magnet device 10 can be made so small and compact that it can be arranged overall within the interior 16 of the matrix print head housing 14 between the foremost pressure needle guide bearing 8 and the guide mouthpiece 9. One of the special structural features of the lifting magnet device 10 is an E-shaped yoke 23, the central yoke leg 24 of which carries the lifting magnet coil 22.

Der Ankerkörper 21 kann aus einem einstückigen Weicheisenstück bestehen. Er kann jedoch auch gegliedert sein, wobei ein Dauermagnet 25 als Mittelteil vorgesehen ist (Figur 3a). Sofern der Dauermagnet 25 eingesetzt wird, ist die Hubmagnetspule 22 umpolbar zu schalten.The anchor body 21 can consist of a one-piece piece of soft iron. However, it can also be structured, with a permanent magnet 25 being provided as the central part (FIG. 3a). If the permanent magnet 25 is used, the solenoid 22 is to be switched to reverse polarity.

An dem Magnetjoch 17 ist ein Mundstückträger 26 gelenkig befestigt. Der Mundstückträger 26 weist zwei parallel verlaufende Arme 26a und 26b auf sowie eine mit diesen gelenkig verbundene Schwinge 26c. Die Arme 26a und 26b sind ebenso gelenkig mit dem Magnetjoch 17 verbunden und die Schwinge 26c ist mit dem Ankerkörper 21 und mit dem Führungsmundstück 9 jeweils unbeweglich verbunden.A mouthpiece carrier 26 is fastened in an articulated manner to the magnetic yoke 17. The mouthpiece carrier 26 has two parallel arms 26a and 26b and a rocker arm 26c articulated thereto. The arms 26a and 26b are also articulated to the magnetic yoke 17 and the rocker 26c is immovably connected to the armature body 21 and to the guide mouthpiece 9, respectively.

Der Mundstückträger 26 ist einstückig aus plastifizierbarem Kunststoff hergestellt und ist daher elastisch genug, um Gelenkstellen 27 aus sogenannten Filmscharnieren 27c zu bilden.The mouthpiece support 26 is made in one piece from plastic that can be plasticized and is therefore elastic enough to make articulation points 27 to form so-called film hinges 27c.

Für die Justage ist das Führungsmundstück 9 in dem Mundstückträger 26 mittels Klebstoffen 28 eingeklebt, so daß (Figuren 3a und 3b) eine Ausrichtung zwischen dem ersten Führungsmundstück 9 und dem zweiten Führungsmundstück 9a stattfinden kann.For the adjustment, the guide mouthpiece 9 is glued into the mouthpiece support 26 by means of adhesives 28, so that (FIGS. 3a and 3b) an alignment can take place between the first guide mouthpiece 9 and the second guide mouthpiece 9a.

Für den Fall eines Magnetjoches 17 mit zwei Magnetpolen 18 und 19 ist für die Rückstellung in die definierte Endstellung vorteilhafterweise eine mechanische Feder (nicht gezeichnet) vorzusehen.In the case of a magnetic yoke 17 with two magnetic poles 18 and 19, a mechanical spring (not shown) is advantageously to be provided for the return to the defined end position.

Claims (8)

Matrixnadeldruckkopf (1) mit mehreren Drucknadeln (3), deren hinterem Ende (3a) jeweils ein Elektromagnetantrieb (5) für Längsbewegungen der Drucknadeln (3) zugeordnet ist, um auf einem Aufzeichnungsträger (4) Druckpunkte zu erzeugen, und deren vordere Enden (3b) jeweils Spalten (3c) oder Reihen in einem hin- und herbewegbaren bzw. auf- und abbewegbaren Führungsmundstück (9) bilden, wobei eine Hubmagnetvorrichtung (10) für zwei definierte Endstellungen eines Magnetankers (11) vorgesehen ist,

dadurch gekennzeichnet,

daß die Hubmagnetvorrichtung (10) insgesamt in einem zum Führungsmundstück (9) unmittelbaren Bereich (15) angeordnet bzw. befestigt ist und ein Magnetjoch (17) mit zwei oder mehr Magnetpolen (18, 19) aufweist, wobei zwischen dem abgestimmten Abstand (20) von zwei ungleichnamigen Magnetpolen (18, 19) ein Ankerkörper (21) durch Ein- oder Ausschalten oder durch Umpolen der eingeschalteten Hubmagnetspule (22) hin- und herbewegbar bzw. auf- und abbewegbar ist und wobei das Führungsmundstück (9) an dem geführten Ankerkörper (21) befestigt ist.Matrix needle print head (1) with a plurality of printing needles (3), the rear end (3a) of which is assigned an electromagnetic drive (5) for longitudinal movements of the printing needles (3) in order to generate printing dots on a recording medium (4), and the front ends (3b ) each form columns (3c) or rows in a guide mouthpiece (9) which can be moved back and forth or moved up and down, a lifting magnet device (10) being provided for two defined end positions of a magnet armature (11),

characterized,

that the lifting magnet device (10) is arranged or fastened overall in a region (15) which is immediate to the guide mouthpiece (9) and has a magnetic yoke (17) with two or more magnetic poles (18, 19), the spacing (20) of two magnetic poles of the same name (18, 19) The armature body (21) can be moved back and forth or moved up and down by switching on or off or by reversing the polarity of the activated solenoid coil (22), and the guide mouthpiece (9) is fastened to the guided armature body (21). Matrixdruckkopf nach Anspruch 1,
dadurch gekennzeichnet,
daß die Hubmagnetvorrichtung (10) insgesamt innerhalb eines Matrixdruckkopfgehäuses (14) zwischen dem vordersten Drucknadelführungslager (8) und dem Führungsmundstück (9) angeordnet ist.Matrix print head according to claim 1,
characterized,
that the lifting magnet device (10) is arranged overall within a matrix print head housing (14) between the foremost pressure needle guide bearing (8) and the guide mouthpiece (9). Matrixnadeldruckkopf nach den Ansprüchen 1 und 2,
dadurch gekennzeichnet,
daß die Hubmagnetvorrichtung (10) ein E-förmiges Joch (23) aufweist, dessen mittlerer Jochschenkel (24) die Magnetspule (22) trägt.Matrix needle printhead according to claims 1 and 2,
characterized,
that the lifting magnet device (10) has an E-shaped yoke (23), the central yoke leg (24) of which carries the magnet coil (22). Matrixnadeldruckkopf nach einem oder mehreren der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
daß der Ankerkörper (21) der Hubmagnetvorrichtung (10) mit einem Dauermagneten (25) versehen ist, wobei die Hubmagnetspule (22) umpolbar ist.Matrix needle printhead according to one or more of claims 1 to 3,
characterized,
that the armature body (21) of the solenoid device (10) is provided with a permanent magnet (25), the solenoid coil (22) being reversible. Matrixnadeldruckkopf nach einem oder mehreren der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
daß an dem Magnetjoch (17) ein Mundstückträger (26) gelenkig befestigt ist.Matrix needle printhead according to one or more of claims 1 to 4,
characterized,
that a mouthpiece carrier (26) is articulated to the magnetic yoke (17). Matrixnadeldruckkopf nach Anspruch 5,
dadurch gekennzeichnet,
daß der Mundstückträger (26) zumindest zwei parallel verlaufende Arme (26a, 26b) aufweist, die gelenkig an einer Schwinge (26c) und an dem Magnetjoch (17) befestigt sind, wobei die Schwinge (26c) mit dem Ankerkörper (21) und mit dem Führungsmundstück (9) jeweils starr verbunden ist.Matrix needle printhead according to claim 5,
characterized,
that the mouthpiece support (26) has at least two parallel arms (26a, 26b) which are articulated to a rocker (26c) and to the magnetic yoke (17), the rocker (26c) with the anchor body (21) and with the guide mouthpiece (9) is rigidly connected. Matrixnadeldruckkopf nach den Ansprüchen 5 und 6,
dadurch gekennzeichnet,
daß der Mundstückträger (26) einstückig ist, aus elastischem Werkstoff besteht und die Gelenkstellen (27) aus sogenannten Filmscharnieren (27c) gebildet sind.Matrix needle printhead according to claims 5 and 6,
characterized,
that the mouthpiece support (26) is in one piece, consists of elastic material and the articulation points (27) are formed from so-called film hinges (27c). Matrixnadeldruckkopf nach den Ansprüchen 1 bis 7,
dadurch gekennzeichnet,
daß das Führungsmundstück (9) in den Mundstückträger (26) eingeklebt ist.Matrix needle printhead according to claims 1 to 7,
characterized,
that the guide mouthpiece (9) is glued into the mouthpiece carrier (26).
EP91250115A 1990-06-21 1991-04-25 Needle matrix print head Expired - Lifetime EP0462684B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4020010A DE4020010A1 (en) 1990-06-21 1990-06-21 MATRIX NEEDLE PRINT HEAD
DE4020010 1990-06-21

Publications (2)

Publication Number Publication Date
EP0462684A1 true EP0462684A1 (en) 1991-12-27
EP0462684B1 EP0462684B1 (en) 1994-06-15

Family

ID=6408916

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91250115A Expired - Lifetime EP0462684B1 (en) 1990-06-21 1991-04-25 Needle matrix print head

Country Status (5)

Country Link
US (1) US5215390A (en)
EP (1) EP0462684B1 (en)
JP (1) JPH04232758A (en)
AT (1) ATE107232T1 (en)
DE (2) DE4020010A1 (en)

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WO1997000174A2 (en) * 1995-06-13 1997-01-03 Tschida Mark J Printing apparatus and method

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US8459889B2 (en) 2010-06-11 2013-06-11 International Business Machines Corporation Multi-dimensional print cutting head
CN110696494B (en) * 2019-10-29 2020-11-27 嘉兴市新中软计算机系统工程有限公司 Printing head of stylus printer

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US4640633A (en) * 1984-03-22 1987-02-03 Dh Technology, Inc. High-speed wire print head with wire print position shift apparatus
US4854752A (en) * 1986-03-21 1989-08-08 Hermes Precisa Internatinal S.A. Convertible print head

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US3882985A (en) * 1973-07-23 1975-05-13 Ncr Co Tiltable matrix print head to permit viewing of the characters
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DE3403795C2 (en) * 1984-02-01 1986-12-18 Mannesmann AG, 4000 Düsseldorf Matrix needle printhead with a mouthpiece that can be adjusted in the direction of the columns
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US4640633A (en) * 1984-03-22 1987-02-03 Dh Technology, Inc. High-speed wire print head with wire print position shift apparatus
DE3412856A1 (en) * 1984-04-03 1985-10-03 Mannesmann AG, 4000 Düsseldorf MATRIX PRINT HEAD WITH ADJUSTABLE PRINT NEEDLE GUIDE
US4854752A (en) * 1986-03-21 1989-08-08 Hermes Precisa Internatinal S.A. Convertible print head

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997000174A2 (en) * 1995-06-13 1997-01-03 Tschida Mark J Printing apparatus and method
WO1997000174A3 (en) * 1995-06-13 1997-05-09 Mark J Tschida Printing apparatus and method
US5793392A (en) * 1995-06-13 1998-08-11 Tschida; Mark J. Printing apparatus and method

Also Published As

Publication number Publication date
US5215390A (en) 1993-06-01
DE59101921D1 (en) 1994-07-21
DE4020010C2 (en) 1992-04-16
ATE107232T1 (en) 1994-07-15
DE4020010A1 (en) 1992-01-09
EP0462684B1 (en) 1994-06-15
JPH04232758A (en) 1992-08-21

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