EP0338176A1 - Wire matrix print head - Google Patents

Wire matrix print head Download PDF

Info

Publication number
EP0338176A1
EP0338176A1 EP88730095A EP88730095A EP0338176A1 EP 0338176 A1 EP0338176 A1 EP 0338176A1 EP 88730095 A EP88730095 A EP 88730095A EP 88730095 A EP88730095 A EP 88730095A EP 0338176 A1 EP0338176 A1 EP 0338176A1
Authority
EP
European Patent Office
Prior art keywords
needle
projection
opposite
armature
anchor
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
EP88730095A
Other languages
German (de)
French (fr)
Other versions
EP0338176B1 (en
Inventor
Bernd Dipl.-Ing.(Fh) Gugel
Johann Dipl.-Ing.(Fh) 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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mannesmann AG filed Critical Mannesmann AG
Priority to DE8888730095T priority Critical patent/DE3882036D1/en
Priority to EP88730095A priority patent/EP0338176B1/en
Priority to AT88730095T priority patent/ATE90913T1/en
Priority to JP1099913A priority patent/JPH0211335A/en
Priority to US07/342,454 priority patent/US5033885A/en
Publication of EP0338176A1 publication Critical patent/EP0338176A1/en
Application granted granted Critical
Publication of EP0338176B1 publication Critical patent/EP0338176B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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 matrix needle print head, consisting of a rear electromagnetic drive assembly and a front needle guide assembly opposite a pressure abutment, the electromagnetic drive assembly being formed from a number of the same number of printing needles of the same electromagnetic folding armature systems and each of the systems having a U-shaped magnetic yoke opposite hinged hinged anchor has.
  • electromagnet folding armature system of such matrix needle printheads has very complicated designs, which in most cases lead to poor guiding of the armature, complex, massive designs of the armature and to low magnetic fluxes with considerable stray fluxes.
  • the invention is therefore based on the object of improving the guidance on the basis of a reduced-mass armature and at the same time optimizing the magnetic flux.
  • the hinged anchor engages in a recess by means of at least one projection arranged transversely to the longitudinal extent and in that the hinged anchor is pivotally supported approximately opposite the projection.
  • This projection guides the armature simply and precisely, whereby a special effect arises: the laying of the guide away from the narrow sides of the armature saves distance from the magnetic yoke, so that a more favorable magnetic flux guidance occurs.
  • the guidance of the armature is thus simplified, improved and the magnetic flux optimized.
  • the lateral guide connected to the projection is achieved without space loss even with space savings in that the projection is arranged in a laminated hinged anchor centrally to the width and in relation to the Width is narrower.
  • the depression is arranged in a needle guide housing opposite the magnet yoke, which accommodates the needle guide assembly.
  • a particularly close assignment of the armature including the guide means (projection and depression) is achieved, however, if the depression is arranged in one leg of the magnetic yoke.
  • the magnetic flux can be transferred without disturbing stray fluxes and without large secondary air gaps.
  • the projection of the hinged armature is assigned an additional projection at a distance from a remaining wall web of the depression in the leg of the magnetic yoke, so that the hinged armature can be pivoted fully and largely without bearing play.
  • the additional projection also improves the guidance of the anchor in its longitudinal extent.
  • the bearing play for a pivoting movement is also kept small or even completely switched off transversely to the longitudinal extension of the armature by arranging an elastic bearing ring in the needle guide housing in the area of the radially inner magnet yoke leg opposite and adjacent to the depression.
  • the elastic bearing ring be arranged between a radially inner ring shoulder which is preferred for the radially extending wall of the needle guide housing and a radially outer ring shoulder and that the radially outer ring shoulder Ring shoulder together with the radially extending wall of the needle guide housing limits a space absorbing the movements of the hinged armature.
  • the matrix needle print head is divided into a rear electromagnetic drive assembly 1 and a front needle guide assembly 2.
  • the front needle guide assembly 2 lies against a pressure abutment 3, i.e. for example opposite a platen roller.
  • the electromagnetic drive assembly 1 essentially consists of a coil carrier 4, which is firmly connected to the needle guide housing 7 via a central screw 5 and a central bushing 6, i.e. this holds on the drawn distance via a socket 8.
  • the coil carrier 4 carries a number of electromagnet folding armature systems corresponding to the number of printing needles (for example 9, 18, 24, 48 printing needles).
  • Each printing needle 9 is thus assigned a U-shaped magnetic yoke 10, an electromagnetic coil 11 and a hinged armature 12.
  • the hinged armature 12 is fixedly connected to the pressure needle 9 with its radially inner arm 12a, and a return spring 13 is supported on the arm 12a and against the needle guide housing 7.
  • the printing needles 9 (for example 9, 18, 24 or 48 pieces) are also guided in transverse walls 14, 15 and 16 and in a mouthpiece 17.
  • the folding anchor 12 is drawn in the printing position in which the printing needles 9 print 18 dots on a recording medium 19 via an ink ribbon. For this purpose, a maximum stroke of the printing needles 9 of 0.5 mm is required.
  • the hinged armature 12 strikes a damping ring 20 with the radially inner arm 12a.
  • a projection 21 which is formed transversely to the longitudinal extent of the hinged anchor 12 and engages loosely in a recess 22.
  • An additional projection 21a forms a further guide in the longitudinal direction of the hinged armature 12.
  • a recess 22a is created by the shape and dimensioning of the magnetic yoke 10.
  • the projection 21 is advantageously punched out in a laminated hinged anchor 12 as a sheet metal part, so that after the connection of the slats, the projection 21 is centered on the width of the anchor 12 and is narrower in relation to the width.
  • the width of the recess 22 is then adjusted accordingly. Since the thickness of the sheet can be about 0.5 mm, the width of the recess 22 is only larger by the amount of movement.
  • the recess 22 can also be provided in the needle guide housing 7, specifically in its radially extending wall 7a.
  • FIG. 2 provides the depression 22 in one leg 10a of the magnetic yoke 10.
  • a wall web 23 remains in the leg 10a of the magnetic yoke 10.
  • the hinged anchor 12 is also guided through an elastic bearing ring 24 arranged approximately opposite the wall web 23.
  • the elastic bearing ring 24 (here an O-ring) is in the area of the radially inner magnetic yoke leg 10a (FIG. 1) is held on the radially extending wall 7a of the needle guide housing 7 with a radially inner ring shoulder 25 and a radially outer ring shoulder 26.
  • the radially extending wall 7a forms a free space 27 in which the hinged armature 12 can be moved with a radially outer arm 12b which is wider than the arm 12a.
  • this movement path is very small with regard to the pressure needle stroke of approximately 0.5 mm, so that a sufficiently dimensioned free space 27 can also be achieved with a compact design.

Landscapes

  • Impact Printers (AREA)

Abstract

A wire matrix printhead consists of a rear electromagnet drive assembly (1) and a front needle guide assembly (2) lying opposite a printing surface (3), the electromagnet drive assembly (1) being formed from a number of identical electromagnet folding armature systems and each of the systems having a U-shaped magnetic yoke (10) with folding armature (12) mounted swivellably opposite it. <??>In such a folding armature (12), the mass is reduced, the guidance improved and at the same time the magnetic flux optimised in that the folding armature (12) engages in a recess (22) by means of at least one projection (21) arranged transversely to the longitudinal extension and in that the folding armature (12) is swivellably supported approximately opposite the projection (21). <IMAGE>

Description

Die Erfindung betrifft einen Matrixnadeldruckkopf, bestehend aus einer hinteren Elektromagnetantriebsbaugruppe und einer vorderen, einem Druckwiderlager gegenüberliegenden Nadelführungsbaugruppe, wobei die Elektromagnetantriebsbaugruppe aus einer der Anzahl der Drucknadeln entsprechenden Anzahl von gleichen Elektromagnet-Klappanker-Systemen gebildet ist und jedes der Systeme ein U-förmiges Magnetjoch mit gegenüberliegend schwenkbar gelagertem Klappanker aufweist.The invention relates to a matrix needle print head, consisting of a rear electromagnetic drive assembly and a front needle guide assembly opposite a pressure abutment, the electromagnetic drive assembly being formed from a number of the same number of printing needles of the same electromagnetic folding armature systems and each of the systems having a U-shaped magnetic yoke opposite hinged hinged anchor has.

Das Elektromagnet-Klappanker-System derartiger Matrixnadeldruckköpfe weist sehr komplizierte Bauweisen auf, die in den meisten Fällen zu mangelhafter Führung des Ankers, aufwendigen, massenreichen Gestaltungen des Ankers und zu niedrigen Magnetflüssen mit erheblichen Streuflüssen führen.The electromagnet folding armature system of such matrix needle printheads has very complicated designs, which in most cases lead to poor guiding of the armature, complex, massive designs of the armature and to low magnetic fluxes with considerable stray fluxes.

Es ist bekannt (EP-0 152 117), einen lamellierten Anker als Klappanker auszubilden und mit einem Federgelenk zu versehen. Derartige Federgelenke sind jedoch aufwendig und von der Werkstoffseite her problematisch. Das Federgelenk kann außerdem die Funktion eines günstigen Magnetflusses durch den sekundären Luftspalt nur sehr schwer erfüllen.It is known (EP-0 152 117) to design a laminated anchor as a hinged anchor and to provide it with a spring joint. However, such spring joints are complex and problematic from the material side. The spring joint is also very difficult to fulfill the function of a favorable magnetic flux through the secondary air gap.

Für den Fall, daß ohne Federgelenk gebaut wird und ein Vollwerkstoff-­Anker vorausgesetzt wird, ist es ebenfalls bekannt, die Führung des Ankers über einen Auflagestift und einen Gummiring, die beide auf einer Seite angeordnet sind, vorzunehmen (EP-0 157 014) oder den Anker mit Ausnehmungen zwischen Vorsprüngen zu führen (EP-0 110 662); eine andere bekannte Führung (US-PS 4, 140, 406) besteht aus einer Steck- bzw. Schlitzlagerung des Ankers am radial äußeren Ende und aus einer radial inneren seitlichen Führung.In the event that a spring joint is built and a solid material anchor is required, it is also known to guide the anchor using a support pin and a rubber ring, both of which are arranged on one side (EP-0 157 014) or to guide the anchor with recesses between projections (EP-0 110 662); Another known guide (US-PS 4, 140, 406) consists of a plug or slot bearing of the armature at the radially outer end and from a radial inner side guide.

Sämtliche dieser Führungen setzen eine umständliche Herstelltechnik voraus und sind nicht sehr genau. Die Magnetflußführung bei solchen Bauweisen läßt außerdem zu wünschen übrig. Im übrigen sind für derart schwere Anker auch höhere Antriebskräfte und dadurch größere Elektromagnetspulen,d.h. eine höhere Ampere-Windungszahl erforderlich.All of these tours require laborious manufacturing technology and are not very precise. The magnetic flux guidance in such designs also leaves something to be desired. Incidentally, higher driving forces and thus larger electromagnetic coils, i.e. a higher ampere number of turns is required.

Der Erfindung liegt deshalb die Aufgabe zugrunde, auf der Basis eines massenreduzierten Ankers die Führung zu verbessern und gleichzeitig den Magnetfluß zu optimieren.The invention is therefore based on the object of improving the guidance on the basis of a reduced-mass armature and at the same time optimizing the magnetic flux.

Die gestellte Aufgabe wird bei dem eingangs bezeichneten Matrixnadeldruckkopf erfindungsgemäß dadurch gelöst, daß der Klappanker mittels zumindest eines, quer zur Längserstreckung angeordneten Vorsprungs in eine Vertiefung eingreift und daß Klappanker dem Vorsprung etwa gegenüberliegend schwenkbar abgestützt ist. Bei lamellierten Ankern ist est fertigungstechnisch leicht möglich, einen solchen Vorsprung zu bilden. Dieser Vorsprung (oder mehrere Vorsprünge) führt den Anker einfach und genau, wobei ein besonderer Effekt entsteht: Die Verlegung der Führung von den Schmalseiten des Ankers weg erspart Abstand zum Magnetjoch, so daß eine günstigere Magnetflußführung auftritt. Mit dem Eingreifen des Vorsprungs in die Vertiefung wird somit die Führung des Ankers vereinfacht, verbessert und der Magnetfluß optimiert. Außerdem ist es jedoch möglich, mit schmaleren Ankern als bisher auszukommen, d.h. die bisher seitlichen Führungen werden entweder nach unten oder nach oben über den Anker verlegt.The stated object is achieved according to the invention in the matrix needle printhead mentioned at the outset by the fact that the hinged anchor engages in a recess by means of at least one projection arranged transversely to the longitudinal extent and in that the hinged anchor is pivotally supported approximately opposite the projection. In the case of laminated anchors, it is easily possible in terms of production technology to form such a projection. This projection (or several projections) guides the armature simply and precisely, whereby a special effect arises: the laying of the guide away from the narrow sides of the armature saves distance from the magnetic yoke, so that a more favorable magnetic flux guidance occurs. With the engagement of the projection in the recess, the guidance of the armature is thus simplified, improved and the magnetic flux optimized. However, it is also possible to get by with narrower anchors than before, i.e. the previously lateral guides are either laid down or up over the anchor.

Die mit dem Vorsprung verbundene seitliche Führung wird ohne Raumverlust sogar mit Raumersparnis dadurch erzielt, daß der Vorsprung in einem lamellierten Klappanker mittig zur Breite angeordnet und bezogen auf die Breite schmaler ist.The lateral guide connected to the projection is achieved without space loss even with space savings in that the projection is arranged in a laminated hinged anchor centrally to the width and in relation to the Width is narrower.

Dieselben Führungseffekte und die Magnetflußoptimierung durch eine kompakte Bauweise wird außerdem dadurch erzielt, daß die Vertiefung in einem dem Magnetjoch gegenüberliegenden Nadelführungsgehäuse, das die Nadelführungsbaugruppe aufnimmt, angeordnet ist.The same guiding effects and the magnetic flux optimization due to a compact design are also achieved in that the depression is arranged in a needle guide housing opposite the magnet yoke, which accommodates the needle guide assembly.

Eine besonders enge Zuordnung des Ankers einschließlich der Führungsmittel (Vorsprung und Vertiefung) kommt jedoch dann zustande, wenn die Vertiefung in einem Schenkel des Magnetjochs angeordnet ist. In diesem Fall ist eine Überleitung des Magnetflusses ohne störende Streuflüsse und ohne große Sekundärluftspalte möglich.A particularly close assignment of the armature including the guide means (projection and depression) is achieved, however, if the depression is arranged in one leg of the magnetic yoke. In this case, the magnetic flux can be transferred without disturbing stray fluxes and without large secondary air gaps.

Nach weiteren Merkmalen der Erfindung ist vorgesehen, daß dem Vorsprung des Klappankers ein zusätzlicher Vorsprung im Abstand eines verbleibenden Wandstegs der Vertiefung in dem Schenkel des Magnetjoches zugeordnet ist, so daß der Klappanker satt und weitestgehend lagerspielfrei schwenkbar ist. Der zusätzliche Vorsprung verbessert die Führung des Ankers auch in seiner Längserstreckung.According to further features of the invention, it is provided that the projection of the hinged armature is assigned an additional projection at a distance from a remaining wall web of the depression in the leg of the magnetic yoke, so that the hinged armature can be pivoted fully and largely without bearing play. The additional projection also improves the guidance of the anchor in its longitudinal extent.

Das Lagerspiel für eine Schwenkbewegung wird außerdem quer zur Längserstreckung des Ankers dadurch kleingehalten oder sogar gänzlich ausgeschaltet, daß im Bereich des radial inneren Magnetjoch-Schenkels diesem gegenüberliegend und zu der Vertiefung benachbart ein elastischer Lagerring im Nadelführungsgehäuse angeordnet ist.The bearing play for a pivoting movement is also kept small or even completely switched off transversely to the longitudinal extension of the armature by arranging an elastic bearing ring in the needle guide housing in the area of the radially inner magnet yoke leg opposite and adjacent to the depression.

Für lamellierte Anker, deren Herstellung besondere Maßnahmen zur Verbindung der Lamellen erfordert, wird ferner vorgeschlagen, daß der elastische Lagerring zwischen einem zur radial verlaufenden Wandung des Nadelführungsgehäuses vorgezogenen, radial inneren Ringabsatz und einem radial äußeren Ringabsatz angeordnet ist und daß der radial äußere Ringabsatz zusammen mit der radial verlaufenden Wandung des Nadelführungsgehäuses einen die Bewegungen des Klappankers aufnehmenden Freiraum begrenzt.For laminated anchors, the manufacture of which requires special measures for connecting the lamellae, it is further proposed that the elastic bearing ring be arranged between a radially inner ring shoulder which is preferred for the radially extending wall of the needle guide housing and a radially outer ring shoulder and that the radially outer ring shoulder Ring shoulder together with the radially extending wall of the needle guide housing limits a space absorbing the movements of the hinged armature.

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

  • Fig. 1 einen Halbschnitt eines Matrixnadeldruckkopfes und
  • Fig. 2 eine Einzelheit des Elektromagnet-Klappanker-Systems mit der Führung des Ankers in vergrößertem Maßstab.
An embodiment of the invention is shown in the drawing and will be described in more detail below. Show it
  • Fig. 1 shows a half section of a matrix needle print head and
  • Fig. 2 shows a detail of the electromagnet folding armature system with the guidance of the armature on an enlarged scale.

Der Matrixnadeldruckkopf ist in eine hintere Elektromagnetantriebsbau­gruppe 1 und eine vordere Nadelführungsbaugruppe 2 gegliedert. Die vordere Nadelführungsbaugruppe 2 liegt einem Druckwiderlager 3, d.h. beispielsweise einer Schreibwalze gegenüber.The matrix needle print head is divided into a rear electromagnetic drive assembly 1 and a front needle guide assembly 2. The front needle guide assembly 2 lies against a pressure abutment 3, i.e. for example opposite a platen roller.

Die Elektromagnetantriebsbaugruppe 1 besteht im wesentlichen aus einem Spulenträger 4, der über eine zentrale Schraube 5 und eine Zentralbuchse 6 fest mit dem Nadelführungsgehäuse 7 verbunden ist, d.h. dieses auf den gezeichneten Abstand über eine Buchse 8 hält.The electromagnetic drive assembly 1 essentially consists of a coil carrier 4, which is firmly connected to the needle guide housing 7 via a central screw 5 and a central bushing 6, i.e. this holds on the drawn distance via a socket 8.

Der Spulenträger 4 trägt eine Anzahl Elektromagnet-Klappanker-Systeme entsprechend der Anzahl der Drucknadeln (z.B. 9, 18, 24, 48 Drucknadeln). Jeder Drucknadel 9 ist somit ein U-förmiges Magnetjoch 10, eine Elektromagnetspule 11 und ein Klappanker 12 zugeordnet. Der Klappanker 12 ist mit seinem radial inneren Arm 12a mit der Drucknadel 9 fest verbunden, und eine Rückholfeder 13 stützt sich am Arm 12a und gegen das Nadelführungsgehäuse 7 ab. Die Drucknadeln 9 (beispielsweise 9, 18, 24 oder 48 Stück) sind außerdem in Querwänden 14, 15 und 16 und in einem Mundstück 17 geführt.The coil carrier 4 carries a number of electromagnet folding armature systems corresponding to the number of printing needles (for example 9, 18, 24, 48 printing needles). Each printing needle 9 is thus assigned a U-shaped magnetic yoke 10, an electromagnetic coil 11 and a hinged armature 12. The hinged armature 12 is fixedly connected to the pressure needle 9 with its radially inner arm 12a, and a return spring 13 is supported on the arm 12a and against the needle guide housing 7. The printing needles 9 (for example 9, 18, 24 or 48 pieces) are also guided in transverse walls 14, 15 and 16 and in a mouthpiece 17.

Der Klappanker 12 ist in der Druckstellung gezeichnet, in der die Drucknadeln 9 über ein Farbband 18 Punkte auf einem Aufzeichnungsträger 19 drucken. Hierzu ist ein maximaler Hubweg der Drucknadeln 9 von 0,5 mm erforderlich. In der durch die Rückholfeder 13 bestimmten rückgezogenen Stellung schlägt der Klappanker 12 mit dem radial inneren Arm 12a gegen einen Dämpfungsring 20.The folding anchor 12 is drawn in the printing position in which the printing needles 9 print 18 dots on a recording medium 19 via an ink ribbon. For this purpose, a maximum stroke of the printing needles 9 of 0.5 mm is required. In the retracted position determined by the return spring 13, the hinged armature 12 strikes a damping ring 20 with the radially inner arm 12a.

Die genaue Führung des Klappankers 12 wird nun durch einen sich quer zur Längserstreckung des Klappankers 12 gebildeten Vorsprung 21 erzielt, der in eine Vertiefung 22 lose eingreift. Ein zusätzlicher Vorsprung 21a bildet eine weitere Führung in Längserstreckungsrichtung des Klappankers 12. Hierbei wird durch Form und Bemessung des Magnetjoches 10 eine Vertiefung 22a geschaffen. Der Vorsprung 21 wird vorteilhafterweise in einem lamellierten Klappanker 12 als Blechformteil mit ausgestanzt, so daß nach der Verbindung der Lamellen der Vorsprung 21 mittig zur Breite des Ankers 12 liegt und bezogen auf die Breite schmaler ist. Entsprechend ist dann die Vertiefung 22 in ihrer Breite angepaßt. Da die Dicke des Bleches ca 0,5 mm sein kann, ist die Breite der Vertiefung 22 nur um das Bewegungsspiel größer.The precise guidance of the hinged anchor 12 is now achieved by a projection 21 which is formed transversely to the longitudinal extent of the hinged anchor 12 and engages loosely in a recess 22. An additional projection 21a forms a further guide in the longitudinal direction of the hinged armature 12. Here, a recess 22a is created by the shape and dimensioning of the magnetic yoke 10. The projection 21 is advantageously punched out in a laminated hinged anchor 12 as a sheet metal part, so that after the connection of the slats, the projection 21 is centered on the width of the anchor 12 and is narrower in relation to the width. The width of the recess 22 is then adjusted accordingly. Since the thickness of the sheet can be about 0.5 mm, the width of the recess 22 is only larger by the amount of movement.

Grundsätzlich kann die Vertiefung 22 auch im Nadelführungsgehäuse 7, und zwar in dessen radial verlaufender Wandung 7a angebracht sein.Basically, the recess 22 can also be provided in the needle guide housing 7, specifically in its radially extending wall 7a.

Die dargestellte Auführungsform (Fig. 2) sieht die Vertiefung 22 in einem Schenkel 10a des Magnetjochs 10 vor. Hierdurch verbleibt ein Wandsteg 23 in dem Schenkel 10a des Magnetjoches 10. Der Klappanker 12 schwenkt bei Vorhandensein des zusätzlichen Vorsprunges 21a satt und weitestgehend spielfrei um das aus dem Wandsteg 23 gebildete Schwenklager. Der Klappanker 12 ist weiterhin durch einer etwa dem Wandsteg 23 gegenüberliegend angeordneten elastischen Lagerring 24 geführt. Der elastische Lagerring 24 (hier ein O-Ring) ist im Bereich des radial inneren Magnetjoch-Schenkels 10a (Fig. 1 ) an der radial verlaufenden Wandung 7a des Nadelführungsgehäuses 7 mit einem radial inneren Ringabsätze 25 und einem radial äußeren Ringabsatz 26 gehalten. Anschließend an diese Ringabsätze 25 und 26 bildet die radial verlaufende Wandung 7a einen Freiraum 27, in dem der Klappanker 12 mit einem radial äußeren Arm 12b, der breiter als der Arm 12a ist, bewegt werden kann. Dieser Bewegungsweg ist jedoch im Hinblick auf den Drucknadelhub von ca 0,5 mm sehr gering, so daß ein ausreichend bemessener Freiraum 27 auch bei Kompaktbauweise erzielt werden kann.The embodiment shown (FIG. 2) provides the depression 22 in one leg 10a of the magnetic yoke 10. As a result, a wall web 23 remains in the leg 10a of the magnetic yoke 10. When the additional projection 21a is present, the hinged armature 12 swings smoothly and largely without play around the pivot bearing formed from the wall web 23. The hinged anchor 12 is also guided through an elastic bearing ring 24 arranged approximately opposite the wall web 23. The elastic bearing ring 24 (here an O-ring) is in the area of the radially inner magnetic yoke leg 10a (FIG. 1) is held on the radially extending wall 7a of the needle guide housing 7 with a radially inner ring shoulder 25 and a radially outer ring shoulder 26. Following these ring shoulders 25 and 26, the radially extending wall 7a forms a free space 27 in which the hinged armature 12 can be moved with a radially outer arm 12b which is wider than the arm 12a. However, this movement path is very small with regard to the pressure needle stroke of approximately 0.5 mm, so that a sufficiently dimensioned free space 27 can also be achieved with a compact design.

Claims (7)

1. Matrixnadeldruckkopf, bestehend aus einer hinteren Elektromagnetantriebsbaugruppe und einer vorderen, einem Druckwiderlager gegenüberliegenden Nadelführungsbaugruppe, wobei die Elektromagnetantriebsbaugruppe aus einer der Anzahl der Drucknadeln entsprechenden Anzahl von gleichen Elektromagnet-Klappanker-Systemen gebildet ist und jedes der System ein U-förmiges Magnetjoch mit gegenüberliegend schwenkbar gelagertem Klappanker aufweist,
dadurch gekennzeichnet,
daß der Klappanker (12) mittels zumindest eines, quer zur Längserstreckung angeordneten Vorsprungs (21) in eine Vertiefung (22) eingreift und daß der Klappanker (12) dem Vorsprung (21) etwa gegenüberliegend schwenkbar abgestützt ist.
1. Matrix needle print head, consisting of a rear electromagnetic drive assembly and a front needle guide assembly opposite a pressure abutment, the electromagnetic drive assembly being formed from a number of the same electromagnetic needle armature systems corresponding to the number of print needles, and each of the systems being a U-shaped magnetic yoke with opposite pivoting stored hinged anchor,
characterized,
that the hinged anchor (12) engages in a recess (22) by means of at least one projection (21) arranged transversely to the longitudinal extent and that the hinged anchor (12) is pivotably supported opposite the projection (21).
2. Matrixnadeldruckkopf nach Anspruch 1,
dadurch gekennzeichnet,
daß der Vorsprung (21) in einem lamellierten Klappanker (12) mittig zur Breite angeordnet und bezogen auf die Breite schmaler ist.
2. matrix needle printhead according to claim 1,
characterized,
that the projection (21) in a laminated hinged anchor (12) is arranged centrally to the width and is narrower in relation to the width.
3. Matrixnadeldruckkopf nach den Ansprüchen 1 und 2,
dadurch gekennzeichnet,
daß die Vertiefung (22) in einem dem magnetjoch (10) gegenüberliegenden Nadelführungsgehäuse (7), das die Nadelführungsbaugruppe (2) aufnimmt, angeordnet ist.
3. matrix needle printhead according to claims 1 and 2,
characterized,
that the recess (22) is arranged in a magnet guide yoke (10) opposite the needle guide housing (7) which receives the needle guide assembly (2).
4. Matrixnadeldruckkopf nach den Ansprüchen 1 und 2,
dadurch gekennzeichnet,
daß die Vertiefung (22) in einem Schenkel (10a) des Magnetjochs (10) angeordnet ist.
4. matrix needle printhead according to claims 1 and 2,
characterized,
that the recess (22) is arranged in one leg (10a) of the magnetic yoke (10).
5. Matrixnadeldruckkopf nach den Ansprüchen 1, 2 und 4,
dadurch gekennzeichnet,
daß dem Vorsprung (21) des Klappankers (12) ein zusätzlicher Vorsprung (21a) im Abstand eines verbleibenden Wandstegs (23) der Vertiefung (22) in dem Schenkel (10a) des Magnetjoches (10) zugeordnet ist, so daß der Klappanker (12) satt und weitestgehend lagerspielfrei schwenkbar ist.
5. matrix needle printhead according to claims 1, 2 and 4,
characterized,
that the projection (21) of the folding anchor (12) is assigned an additional projection (21a) at a distance from a remaining wall web (23) of the recess (22) in the leg (10a) of the magnetic yoke (10), so that the folding anchor (12 ) can be swiveled fully and largely without bearing play.
6. Matrixnadeldruckkopf nach den Ansprüchen 1 bis 5,
dadurch gekennzeichnet,
daß im Bereich des radial inneren Magnetjoch-Schenkels (10a) diesem gegenüberliegend und zu der Vertiefung (22) benachbart ein elastischer Lagerring (24) im Nadelführungsgehäuse (7) angeordnet ist.
6. matrix needle printhead according to claims 1 to 5,
characterized,
that an elastic bearing ring (24) is arranged in the needle guide housing (7) in the region of the radially inner magnetic yoke leg (10a) opposite this and adjacent to the depression (22).
Matrixnadeldruckkopf nach Anspruch 6,
dadurch gekennzeichnet,
daß der elastische Lagerring (24) zwischen einem zur radial verlaufenden Wandung (7a) des Nadelführungsgehäuses (7) vorgezogenen, radial inneren Ringabsatz (25) und einem radial äußeren Ringabsatz (26) angeordnet ist und daß der radial äußere Ringabsatz (26) zusammen mit der radial verlaufenden Wandung (7a) des Nadelführungsgehäuses (7) einen die Bewegungen des Klappankers (12) aufnehmenden Freiraum (27) begrenzt.
Matrix needle printhead according to claim 6,
characterized,
that the elastic bearing ring (24) is arranged between a radially inner ring shoulder (25) and a radially outer ring shoulder (26) which is advanced to the radially extending wall (7a) of the needle guide housing (7) and that the radially outer ring shoulder (26) together with the radial wall (7a) of the needle guide housing (7) delimits a free space (27) which receives the movements of the hinged armature (12).
EP88730095A 1988-04-22 1988-04-22 Wire matrix print head Expired - Lifetime EP0338176B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE8888730095T DE3882036D1 (en) 1988-04-22 1988-04-22 MATRIX NEEDLE PRINT HEAD.
EP88730095A EP0338176B1 (en) 1988-04-22 1988-04-22 Wire matrix print head
AT88730095T ATE90913T1 (en) 1988-04-22 1988-04-22 MATRIX PIN PRINT HEAD.
JP1099913A JPH0211335A (en) 1988-04-22 1989-04-19 Dot matrix printing head
US07/342,454 US5033885A (en) 1988-04-22 1989-04-21 Dot matrix pin print head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88730095A EP0338176B1 (en) 1988-04-22 1988-04-22 Wire matrix print head

Publications (2)

Publication Number Publication Date
EP0338176A1 true EP0338176A1 (en) 1989-10-25
EP0338176B1 EP0338176B1 (en) 1993-06-23

Family

ID=8200553

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88730095A Expired - Lifetime EP0338176B1 (en) 1988-04-22 1988-04-22 Wire matrix print head

Country Status (5)

Country Link
US (1) US5033885A (en)
EP (1) EP0338176B1 (en)
JP (1) JPH0211335A (en)
AT (1) ATE90913T1 (en)
DE (1) DE3882036D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0467442A1 (en) * 1990-07-13 1992-01-22 Philips Patentverwaltung GmbH Matrix printer with a print head having print wires

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE58903294D1 (en) * 1989-02-14 1993-02-25 Mannesmann Ag SWINGARM FRAME FOR THE PRINTING ELEMENTS OF A MATRIX LINE PRINTER.
US5269610A (en) * 1989-11-20 1993-12-14 Fujitsu Limited Armature design in a wire matrix printing head
JPH04135866A (en) * 1990-09-28 1992-05-11 Tokyo Electric Co Ltd Dot printer head
JPH04175171A (en) * 1990-11-09 1992-06-23 Tokyo Electric Co Ltd Dot printer head
US5975776A (en) * 1995-06-06 1999-11-02 Axiohm Transaction Solutions, Inc. Dot matrix print head with unitary armature assembly and method of operation thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4626115A (en) * 1984-03-08 1986-12-02 Tokyo Electric Co., Ltd. Dot printer head
US4687354A (en) * 1985-09-12 1987-08-18 Kazumi Tanaka Dot matrix printer head
US4737042A (en) * 1985-05-23 1988-04-12 Seikosha Co., Ltd. Printing head with springs for pivotably holding printing hammers

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS623231Y2 (en) * 1980-11-25 1987-01-24
JPS60124259A (en) * 1983-12-09 1985-07-03 Tokyo Electric Co Ltd Wire dot printer
JPS60127166A (en) * 1983-12-13 1985-07-06 Matsushita Electric Ind Co Ltd Printing head for dot printer
JPS60168661A (en) * 1984-02-14 1985-09-02 Matsushita Electric Ind Co Ltd Printing head for wire dot printer
DE3412429A1 (en) * 1984-04-03 1985-10-10 Nixdorf Computer Ag, 4790 Paderborn FOLDING ARM MAGNET FOR NEEDLE PRINT HEAD
JPS612569A (en) * 1984-06-15 1986-01-08 Matsushita Electric Ind Co Ltd Printing head for wire dot printer
US4575268A (en) * 1984-10-25 1986-03-11 Industrial Technology Research Institute Dot matrix printer head
US4674897A (en) * 1985-08-26 1987-06-23 Dataproducts, Inc. Actuator for dot matrix printhead
US4840501A (en) * 1986-04-29 1989-06-20 Dataproducts Corporation Three pole printhead actuator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4626115A (en) * 1984-03-08 1986-12-02 Tokyo Electric Co., Ltd. Dot printer head
US4737042A (en) * 1985-05-23 1988-04-12 Seikosha Co., Ltd. Printing head with springs for pivotably holding printing hammers
US4687354A (en) * 1985-09-12 1987-08-18 Kazumi Tanaka Dot matrix printer head

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN, Band 21, Nr. 1, Juni 1978, Seite 18, New York, US; J.E. LISINSKI: "Articulated print wire actuator" *
PATENT ABSTRACTS OF JAPAN, Band 9, Nr. 77 (M-369)[1800], 6. April 1985; & JP-A-59 207 266 (HITACHI SEISAKUSHO K.K.) 24-11-1984 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0467442A1 (en) * 1990-07-13 1992-01-22 Philips Patentverwaltung GmbH Matrix printer with a print head having print wires

Also Published As

Publication number Publication date
US5033885A (en) 1991-07-23
ATE90913T1 (en) 1993-07-15
JPH0211335A (en) 1990-01-16
DE3882036D1 (en) 1993-07-29
EP0338176B1 (en) 1993-06-23

Similar Documents

Publication Publication Date Title
DE2536217C3 (en) Guide cap for a wire matrix impact print head
DE2167021C3 (en) Pressure wire guide
DE2630931C3 (en) Drive device for a dot matrix printer
EP0357860B1 (en) Wire matrix print head of the flap armature type
DE2543411C2 (en) Actuating device for a print wire of a matrix printer
EP0060969A1 (en) Magnetic drive system for producing linear movements
EP0338176B1 (en) Wire matrix print head
DE2629267C3 (en) Actuating device for a wire matrix printer
DE1245627B (en) Print hammer device
DE2846215C3 (en) Plunger magnet for wire printers
DE2306309C2 (en) Electromagnetic drive device for a high-speed printer
EP0157727B1 (en) Matrix print head
DE3400888A1 (en) PRINT PIN OPERATING DEVICE FOR DOT MATRIX PRINTER AND METHOD FOR THEIR PRODUCTION
EP0040883B1 (en) Matrix printer with magnetic print-head adjustment
EP0150663B1 (en) Matrix printer head with adjustable print wire guide
EP0175009A1 (en) Matrix printer, in particular a matrix line printer
DE3402621C2 (en)
EP0188669B1 (en) Matrix printing head
EP0157725B1 (en) Matrix print head with an adjustable print wire guide
EP0188671A1 (en) Armature construction group manufacturing process for matrix print heads
DE68911278T2 (en) Dot matrix printer with stop print head.
EP0163592B1 (en) Matrix print head with adjustable print wire guide
DE3152448C2 (en) Plunger magnet system with high efficiency
DE69111288T2 (en) Matrix print head.
EP0482358B1 (en) Electrical recorder

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR GB IT LI NL

17P Request for examination filed

Effective date: 19891019

17Q First examination report despatched

Effective date: 19910424

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB IT LI NL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 19930623

Ref country code: NL

Effective date: 19930623

Ref country code: BE

Effective date: 19930623

REF Corresponds to:

Ref document number: 90913

Country of ref document: AT

Date of ref document: 19930715

Kind code of ref document: T

ET Fr: translation filed
REF Corresponds to:

Ref document number: 3882036

Country of ref document: DE

Date of ref document: 19930729

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19930923

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19940422

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19940430

Ref country code: CH

Effective date: 19940430

26N No opposition filed
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19950320

Year of fee payment: 8

Ref country code: GB

Payment date: 19950320

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19960422

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19960422

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19961227

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20020614

Year of fee payment: 15

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20031101