EP0338176B1 - Wire matrix print head - Google Patents
Wire matrix print head Download PDFInfo
- Publication number
- EP0338176B1 EP0338176B1 EP88730095A EP88730095A EP0338176B1 EP 0338176 B1 EP0338176 B1 EP 0338176B1 EP 88730095 A EP88730095 A EP 88730095A EP 88730095 A EP88730095 A EP 88730095A EP 0338176 B1 EP0338176 B1 EP 0338176B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- projection
- print head
- wire
- hinged armature
- recess
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000011159 matrix material Substances 0.000 title claims abstract description 15
- 230000004907 flux Effects 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000013016 damping Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
Images
Classifications
-
- 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 matrix needle print head consisting of a rear electromagnetic drive assembly and a front needle guide assembly opposite a pressure abutment 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.
- US-A-4,737,042 discloses a matrix printhead in which the anchors require a yoke plate ring for lateral guidance. Such an additional part should, however, be better left out.
- 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 armature engages by means of at least one protrusion extending transversely to the longitudinal extent in a recess in the U-shaped magnetic yoke, that the protrusion is designed such that the engagement of the protrusion in the Deepening accurate guidance in the longitudinal direction of the hinged anchor is achieved and that the hinged anchor is pivotally supported approximately opposite the projection.
- 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. In addition, however, it is possible to get by with narrower anchors than before, ie the previously lateral guides are either laid down or up over the anchor.
- 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 in the middle of 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 extension.
- 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. A maximum stroke of the printing needles 9 of 0.5 mm is required for this.
- 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 approximately 0.5 mm, the width of the recess 22 is only greater by the amount of play.
- the recess 22 can also be provided in the needle guide housing 7, specifically in its radially extending wall 7a.
- the illustrated embodiment provides the depression 22 in a 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.
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- Impact Printers (AREA)
Abstract
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 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, ie a higher ampere number of turns, are also required for such heavy anchors.
In der US-A-4,737,042 ist ein Matrixdruckkopf offenbart, bei dem die Anker für eine seitliche Führung einen Jochplatten-Ring erfordern. Ein solches zusätzliches Teil sollte jedoch besser weggelassen werden können.US-A-4,737,042 discloses a matrix printhead in which the anchors require a yoke plate ring for lateral guidance. Such an additional part should, however, be better left out.
Einen gegenüber dem vorstehenden Vorschlag stark unterschiedlichen Aufbau weist ein ebenfalls bekannter Vorschlag auf (US-A-4,687,354), der nicht der vorgesehenen Gattung entspricht. So fehlt es dort an einer hinteren Elektromagnetspulenantriebsbaugruppe, an einer vorderen Nadelführungsbaugruppe und vor allen Dingen an U-förmigen Magnetjochen mit jeweils gegenüberliegend schwenkbar gelagerten Klappankern.A well-known proposal (US-A-4,687,354), which does not correspond to the intended genus, has a structure which is very different from the above proposal. There is a lack of a rear electromagnetic coil drive assembly, a front needle guide assembly and, above all, U-shaped magnet yokes, each with hinged armatures mounted on opposite sides.
Ein weiterer bekannter Vorschlag (EP 0 157 014 A2) sieht eine seitliche Führung des Klappankers vor, die aus mehreren Einzelteilen zusammengesetzt wird, z.B. aus einem Auflagestift und einem sehr kompliziert gestalteten Anker, der aus gebogenem Blech geformt ist.Another known proposal (EP 0 157 014 A2) provides lateral guidance of the hinged anchor, which is composed of several individual parts, e.g. from a support pin and a very complicated designed anchor, which is formed from bent sheet metal.
Keine der drei vorstehend genannten Lösungen sind außerdem miteinander kombinierbar.None of the three solutions mentioned above can also be combined.
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 Verlaufenden Vorsprungs in eine Vertiefung des U-förmigen Magnetjochs eingreift, daß der Vorsprung so ausgebildet ist, daß durch das Eingreifen des Vorsprungs in die Vertiefung eine genaue Führung in Längserstreckungsrichtung des Klappankers erzielt wird und daß der Klappanker dem Vorsprung etwa gegenüberliegend schwenkbar abgestützt ist. Bei lamellierten Ankern ist es 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 in that the hinged armature engages by means of at least one protrusion extending transversely to the longitudinal extent in a recess in the U-shaped magnetic yoke, that the protrusion is designed such that the engagement of the protrusion in the Deepening accurate guidance in the longitudinal direction of the hinged anchor is achieved and 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. In addition, however, it is possible to get by with narrower anchors than before, ie 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 erzielte, 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 in the middle of 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 extension.
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.
- Fig. 1
- a half section of a matrix needle printhead and
- Fig. 2
- 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
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
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
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
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
Grundsätzlich kann die Vertiefung 22 auch im Nadelführungsgehäuse 7, und zwar in dessen radial verlaufender Wandung 7a angebracht sein.Basically, the
Die dargestellte Ausführungsform (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 einen 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 illustrated embodiment (FIG. 2) provides the
Claims (7)
- A wire matrix print head, consisting of rear electromagnet drive components (1) and front wire guidance components (2) located opposite a print counter-surface (3), the electromagnet drive components (1) being composed of a number of identical electromagnet hinged armature systems corresponding to the number of print wires (9) and each of the systems having a U-shaped magnet yoke (10) with a pivotably mounted hinged armature (12) located opposite, characterised in that the hinged armature (12) engages in a recess (22) in the U-shaped magnet yoke (10) by means of at least one projection (21) which extends transversely to its longitudinal extent, that the projection (21) is designed such that accurate guidance in the direction of the longitudinal extent of the hinged armature (12) is achieved by the engagement of the projection (21) in the recess (22), and that the hinged armature (12) is supported in pivotable manner approximately opposite the projection (21).
- A wire matrix print head according to Claim 1, characterised in that the projection (21) is arranged in a lamellar hinged armature (12) centrally relative to the width and is narrower relative to the width.
- A wire matrix print head according to Claims 1 and 2, characterised in that the recess (22) is located in a wire guidance housing (7) opposite the magnet yoke (10), which housing holds the wire guidance components (2).
- A wire matrix print head according to Claims 1 and 2, characterised in that the recess (22) is located in one leg (10a) of the magnet yoke (10).
- A wire matrix print head according to Claims 1, 2 and 4, characterised in that an additional projection (21a) spaced apart a remaining wall land (23) of the recess (22) in the leg (10a) of the magnet yoke (10) is associated with the projection (21) of the hinged armature (12), so that the hinged armature (12) can be pivoted closely and to as great an extent as possible without bearing clearance.
- A wire matrix print head according to Claims 1 to 5, characterised in that an elastic bearing ring (24) is located in the wire guidance housing (7) in the region of the radially inner magnet yoke leg (10a), located opposite it and adjacent to the recess (22).
- A wire matrix print head according to Claim 6, characterised in that the elastic bearing ring (24) is located between a radially inner ring shoulder (25) which is advanced relative to the radially extending wall (7a) of the wire guidance housing (7) and a radially outer ring shoulder (26), and that the radially outer ring shoulder (26) together with the radially extending wall (7a) of the wire guidance housing (7) defines a space (27) which contains the movements of the hinged armature (12).
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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. |
DE8888730095T DE3882036D1 (en) | 1988-04-22 | 1988-04-22 | MATRIX NEEDLE 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 EP0338176A1 (en) | 1989-10-25 |
EP0338176B1 true 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) |
Families Citing this family (6)
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 |
EP0467442A1 (en) * | 1990-07-13 | 1992-01-22 | Philips Patentverwaltung GmbH | Matrix printer with a print head having print wires |
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 (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0157014A2 (en) * | 1984-04-03 | 1985-10-09 | Siemens Nixdorf Informationssysteme Aktiengesellschaft | Wire print head |
Family Cites Families (11)
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 |
JPS60189457A (en) * | 1984-03-08 | 1985-09-26 | Tokyo Electric Co Ltd | Dot printer 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 |
JPS61268458A (en) * | 1985-05-23 | 1986-11-27 | Seikosha Co Ltd | Printer head |
US4674897A (en) * | 1985-08-26 | 1987-06-23 | Dataproducts, Inc. | Actuator for dot matrix printhead |
US4687354A (en) * | 1985-09-12 | 1987-08-18 | Kazumi Tanaka | Dot matrix printer head |
US4840501A (en) * | 1986-04-29 | 1989-06-20 | Dataproducts Corporation | Three pole printhead actuator |
-
1988
- 1988-04-22 EP EP88730095A patent/EP0338176B1/en not_active Expired - Lifetime
- 1988-04-22 DE DE8888730095T patent/DE3882036D1/en not_active Expired - Fee Related
- 1988-04-22 AT AT88730095T patent/ATE90913T1/en not_active IP Right Cessation
-
1989
- 1989-04-19 JP JP1099913A patent/JPH0211335A/en active Pending
- 1989-04-21 US US07/342,454 patent/US5033885A/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0157014A2 (en) * | 1984-04-03 | 1985-10-09 | Siemens Nixdorf Informationssysteme Aktiengesellschaft | Wire print head |
Also Published As
Publication number | Publication date |
---|---|
US5033885A (en) | 1991-07-23 |
DE3882036D1 (en) | 1993-07-29 |
JPH0211335A (en) | 1990-01-16 |
EP0338176A1 (en) | 1989-10-25 |
ATE90913T1 (en) | 1993-07-15 |
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