EP0371182B1 - Wire matrix printhead of the clapper type - Google Patents

Wire matrix printhead of the clapper type Download PDF

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Publication number
EP0371182B1
EP0371182B1 EP88730265A EP88730265A EP0371182B1 EP 0371182 B1 EP0371182 B1 EP 0371182B1 EP 88730265 A EP88730265 A EP 88730265A EP 88730265 A EP88730265 A EP 88730265A EP 0371182 B1 EP0371182 B1 EP 0371182B1
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EP
European Patent Office
Prior art keywords
pin
magnet yoke
hinged
printer head
electromagnetic coil
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
Application number
EP88730265A
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German (de)
French (fr)
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EP0371182A1 (en
Inventor
Johann Dipl.-Ing. Stempfle (Fh)
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Vodafone GmbH
Original Assignee
Mannesmann AG
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Filing date
Publication date
Application filed by Mannesmann AG filed Critical Mannesmann AG
Priority to DE8888730265T priority Critical patent/DE3879212D1/en
Priority to EP88730265A priority patent/EP0371182B1/en
Priority to AT88730265T priority patent/ATE86552T1/en
Priority to JP1310460A priority patent/JPH02188265A/en
Priority to US07/443,755 priority patent/US4979836A/en
Publication of EP0371182A1 publication Critical patent/EP0371182A1/en
Application granted granted Critical
Publication of EP0371182B1 publication Critical patent/EP0371182B1/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
    • 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 printhead of the hinged armature type with a plurality of systems, each consisting of a pair of magnetic yokes, an electromagnetic coil, a hinged armature and a printing needle, with a higher number of systems based on an outer printhead diameter than the nominal diameter or a lower system number with a smaller printhead diameter than that Nominal diameter is connected, further with an electromagnetic coil carrier, which is made of sintered or investment casting and forms a one-piece component together with a base plate and the pairs of magnetic yoke legs, the electromagnetic coil carrier having radially outer individual magnetic yoke legs, each of which is directed towards a point of contact between the needle head and the hinged armature .
  • Such a matrix needle printhead is known, for example, from DE-A1-34 12 855 or from US-A1-4,230,038.
  • the known solutions have pairs of U-shaped magnet yokes.
  • the yoke legs are rectangular in cross section.
  • Such a design takes up space and space.
  • the problem of position and shape errors occurs during production, and in the case of sintered parts or investment castings, filling defects occur in the production tool.
  • Such filling deficiencies lead to irregularities in the magnetic flux.
  • the magnetic flux depends, among other things, on the density of the material. Calibration problems of the workpiece also arise. All difficulties are further increased as the number of systems increases. With 18 or 24 systems and more systems (assuming a constant nominal diameter), it is now difficult to assign the anchors to the sides of the magnetic yoke legs or to guide the anchors.
  • the generic matrix printhead of the hinged armature type (EP-A-0155816) has guiding points opposite to the hinged armatures, arranged on a needle guide housing, the position of which relative to the hinged armatures is neither precisely determinable nor very precise, because the one-piece component consists of a base plate and the magnet yoke leg pairs forming counterpart can not be set exactly against the needle guide housing.
  • Means for adjusting the needle guide housing relative to the one-piece component are missing, however, to the extent that the needle guide housing with its large rear opening can only be pushed onto a housing of the matrix print head that is usually made of plastic and surrounds the one-piece component. The position of the two parts relative to one another becomes inaccurate.
  • the invention is based on the call, in particular for high-number systems (for example. 18 or 24) without loss of magnetic energy to propose improved, precise anchor guidance and to eliminate the disadvantages described.
  • the radially inner magnetic yoke legs are formed into a closed ring, are formed on the radially inwardly directed teeth, in the tooth gaps in each case grip means for the hinged anchors that the guide means for the hinged anchors from each hinged anchor assigned in pairs there are rail-like projections, which each run in the lateral recesses of the hinged anchor and further in the lateral tooth gaps, the anchor width minus the recesses and the tooth width being of equal tolerance.
  • Such an electromagnetic coil carrier can advantageously be produced from sintered or investment casting with a high degree of tolerance accuracy, with neither filling defects in the production tool nor calibration problems of the workpiece. Above all, however, the space and area problem is solved in that the anchors can be advantageously guided laterally. In addition to small, the invention is therefore particularly suitable for extremely high system numbers.
  • the solution also has the advantage that the cross sections of the hinged armature and the magnet yoke leg pairs are adapted to the magnetic flux, insofar as this is necessary.
  • the one-piece component made of sintered or investment casting is further developed into a central hub part.
  • This solution makes it easier to determine all hinged anchors or all systems.
  • Another advantageous further development of the invention consists in the fact that the hub part consists of a hub base and a disk that connects it to the closed radially inner ring.
  • Such an arrangement that is, the structure of the electromagnetic coil carrier in individually standing radially outer yoke legs, radially inner yoke legs, which form a closed ring and inwardly directed teeth, further into the hub part and now also in a hub base and this with the closed radially inner Ring connecting disc significantly favors the manufacture of the electromagnetic coil carrier and defines all functionally important components to each other.
  • Such an electromagnetic coil carrier can therefore be manufactured with the smallest tolerances.
  • the hub base has a considerably greater thickness than the hub disk. This measure leads to a special mass distribution in the area of the support of a damping ring to be described, so that the rebound phenomena of the hinged anchors with the pressure needles can be moved into an extremely favorable vibration range.
  • a guidance of the magnetic flux and a saving of material is also achieved in that radially inner recesses are provided in the hub disk, which are distributed over the circumference.
  • the hinged anchor type matrix needle printhead (Fig. 1) has e.g. 9, 18 or 24 systems, each consisting of a pair of magnetic yoke legs 1, an electromagnetic coil 2 plugged onto one of the magnetic yoke legs 1a, a hinged armature 3 and a pressure needle 4.
  • the number (9, 18, 24) of these systems defines the nominal diameter 5.
  • the system number, as drawn, is 24.
  • the matrix needle print head is further divided into a rear print head housing 6 and a front print head housing 7.
  • the printing needles 4 are guided or supported by means of bearing disks 8. All 24 printing needles 4 are brought together to form two needle gaps in a mouthpiece 9.
  • the complete matrix needle printhead is also adjusted and fixed by two guide pins 10 on a printhead carriage, not shown.
  • the magnet coil carrier 11 connects the rear printhead housing 6 to the front printhead housing 7 by means of a screw 12 via a housing hub 13.
  • the electromagnetic coil support 11 has radially outside (FIG. 2) individual magnetic yoke legs 1a, which in their cross-section 14 are aligned radially approximately to a needle engagement point 15 (FIG. 1). As a result, the space is optimally used for the electromagnetic coil 2.
  • the opposite, radially inner magnetic yoke legs 1b are combined to form a closed ring 16.
  • This ring 16 forms the prerequisite for further measures to store and guide the hinged anchor 3.
  • there are radially inwardly directed teeth 17 on the closed ring 16 in such a way that the ring width 16a is enlarged in the radial direction by a tooth 17, whereby an increase in the area guiding the magnetic flux threads is achieved.
  • a tooth gap 18 is created by a tooth 17, into which guide means 19 (FIG. 1) for the hinged anchors 3 can engage without interfering laterally.
  • the needle engagement point 15 can consist of a folding anchor 3, against which a pressure needle head 4a loosely rests.
  • the hinged anchor 3 can also be firmly attached to the pressure needle 4 at the needle engagement point 15, e.g. by welding.
  • the guide means 19 consist of protrusions 20 similar to rails, which each extend laterally in lateral recesses 3a of the hinged anchors 3. These lateral recesses 3a of the hinged anchor 3 allow the sliding movement of the

Abstract

A matrix pin print head of the hinged clapper armature construction includes several pin systems, where each pin system comprises a magnet yoke limb pair (1), an electromagnetic coil (2), a hinged clapper armature (3), and a print pin (4). A higher pin system number naturally results in a larger print head or nominal diameter (5). In addition, an electomagnetic coil support (11) is provided, which is produced by sintering or precision casting and which forms a single-piece component (21) together with a base plate and the magnet yoke pairs (1). In order to achieve an advantageous guiding of the armature, in particular for high-number pin systems with, for example, 18 or 24 print pins, without a loss in magnetic energy, the electromagnetic coil support (11) exhibits radially outwardly disposed individual magnet yoke limbs (1a), which magnet yoke limbs (1a), in each case, are directed to a pin engagement point (15) between the pin head (4a) and the hinged clapper armature (3), such that the radially inner magnet yoke limbs (1b) are formed to a closed ring (16) and that this closed ring (16) has attached radially inwardly directed teeth (17), where guide means (19) for the hinged clapper armatures (3), in each case, grip into the tooth gaps (18) of the teeth (17).

Description

Die Erfindung betrifft einen Matrixnadeldruckkopf der Klappankerbauart mit mehreren Systemen, die jeweils aus einem Magnetjochschenkelpaar, einer Elektromagnetspule, einem Klappanker und einer Drucknadel bestehen, wobei eine höhere Systemzahl mit einem äußeren Druckkopfdurchmesser als Nenndurchmesser zugrundegelegt ist oder wobei eine niedrigere Systemzahl mit einem kleineren Druckkopfdurchmesser als dem Nenndurchmesser verbunden ist, ferner mit einem Elektromagnetspulenträger, der aus Sinter- oder Feinguß hergestellt ist und zusammen mit einer Grundplatte und den Magnetjochschenkelpaaren ein einstückiges Bauteil bildet, wobei der Elektromagnetspulenträger radial außen einzelne Magnetjochschenkel aufweist, die jeweils auf eine Nadelangriffsstelle zwischen Nadelkopf und Klappanker allsgerichtet sind.The invention relates to a matrix needle printhead of the hinged armature type with a plurality of systems, each consisting of a pair of magnetic yokes, an electromagnetic coil, a hinged armature and a printing needle, with a higher number of systems based on an outer printhead diameter than the nominal diameter or a lower system number with a smaller printhead diameter than that Nominal diameter is connected, further with an electromagnetic coil carrier, which is made of sintered or investment casting and forms a one-piece component together with a base plate and the pairs of magnetic yoke legs, the electromagnetic coil carrier having radially outer individual magnetic yoke legs, each of which is directed towards a point of contact between the needle head and the hinged armature .

Ein derartiger Matrixnadeldruckkopf ist z.B. aus der DE-A1-34 12 855 oder aus der US-A1-4,230,038 bekannt. Die bekannten Lösungen weisen U-förmige Magnetjochschenkelpaare auf. Die Jochschenkel sind hierbei im Querschnitt rechteckförmig. Eine solche Gestaltung ist jedoch raum- und flächenbeanspruchend. Bei der Herstellung tritt das Problem von Lage- und von Formfehlern auf und bei Sinterteilen bzw. Feingußteilen treten Füllungsmängel in dem Herstellungswerkzeug auf. Derartige Füllungsmängel führen zu Ungleichmäßigkeiten des magnetischen Flusses. Der magnetische Fluß hängt u.a. von der Dichte des Werkstoffes ab. Außerdem entstehen Kalibrierungsprobleme des Werkstückes. Sämtliche Schwierigkeiten werden bei Steigerung der Anzahl der Systeme noch weiter erhöht. So ist es bei 18 oder 24 Systemen und mehr Systemen (gleichbleibender Nenndurchmesser vorausgesetzt) nur noch schwierig möglich, die Anker seitlich den Magnetjochschenkeln zuzuordnen bzw. die Anker zu führen.Such a matrix needle printhead is known, for example, from DE-A1-34 12 855 or from US-A1-4,230,038. The known solutions have pairs of U-shaped magnet yokes. The yoke legs are rectangular in cross section. Such a design, however, takes up space and space. The problem of position and shape errors occurs during production, and in the case of sintered parts or investment castings, filling defects occur in the production tool. Such filling deficiencies lead to irregularities in the magnetic flux. The magnetic flux depends, among other things, on the density of the material. Calibration problems of the workpiece also arise. All difficulties are further increased as the number of systems increases. With 18 or 24 systems and more systems (assuming a constant nominal diameter), it is now difficult to assign the anchors to the sides of the magnetic yoke legs or to guide the anchors.

Der eingangs gattungsgemäß bezeichnete Matrixnadeldruckkopf der Klappankerbauart (EP-A-0155816) weist den Klappankern gegenüberliegende, an einem Nadelführungsgehäuse angeordnete Führungsstellen auf, deren Lage gegenüber den Klappankern weder genau bestimmbar noch sehr genau ist, weil das aus einer Grundplatte und den Magnetjochschenkelpaaren ein einstückiges Bauteil bildende Gegenstück nicht genau gegenüber dem Nadelführungsgehäuse festgelegt werden kann. Mittel zur Justierung des Nadelführungsgehäuses gegenüber dem einstückigen Bauteil fehlen jedoch insoweit, als das Nadelführungsgehäuse mit seiner hinteren großen Öffnung lediglich auf ein das einstückige Bauteil umgebende, meist aus Kunststoff gebildete Gehäuse des Matrixdruckkopfes aufschiebbar ist. Dabei wird die Lage beider Teile zueinander ungenau. Im übrigen fehlen jedoch auch Führungsmittel für jeden einzelnen Klappanker im Sinne einer seitlichen Führung, die ein paralleles Bewegen des Klappankers unterstützen.The generic matrix printhead of the hinged armature type (EP-A-0155816) has guiding points opposite to the hinged armatures, arranged on a needle guide housing, the position of which relative to the hinged armatures is neither precisely determinable nor very precise, because the one-piece component consists of a base plate and the magnet yoke leg pairs forming counterpart can not be set exactly against the needle guide housing. Means for adjusting the needle guide housing relative to the one-piece component are missing, however, to the extent that the needle guide housing with its large rear opening can only be pushed onto a housing of the matrix print head that is usually made of plastic and surrounds the one-piece component. The position of the two parts relative to one another becomes inaccurate. However, there are also no guide means for each individual hinged anchor in the sense of lateral guidance, which support parallel movement of the hinged anchor.

Der Erfindung liegt die Rufgabe zugrunde, insbesondere für hochzahlige Systeme (z .B. 18 oder 24) ohne Einbuße magnetischer Energie eine verbesserte, genaue Ankerführung vorzuschlagen und die geschilderten Nachteile zu beseitigen.The invention is based on the call, in particular for high-number systems (for example. 18 or 24) without loss of magnetic energy to propose improved, precise anchor guidance and to eliminate the disadvantages described.

Die gestellte Aufgabe wird erfindungsgemäß dadurch gelöst, daß die radial inneren Magnetjochschenkel zu einem geschlossenen Ring geformt sind, an den radial nach innen gerichtete Zähne angeformt sind, in deren Zahnlücken jeweils Führungsmittel für die Klappanker greifen daß die Führungsmittel für die Klappanker aus jedem Klappanker paarweise zugeordneten schienenähnlichen Vorsprüngen bestehen, die jeweils in seitlichen Ausnehmungen des Klappankers und weiter in den seitlichen Zahnlücken verlaufen, wobei die Ankerbreite abzüglich der Ausnehmungen und die Zahnbreite toleriert gleichgroß sind. Vorteilhafterweise kann ein derartiger Elektromagnetspulenträger aus Sinter oder Feinguß mit hoher Toleranzgenauigkeit hergestellt werden, wobei weder Füllungsmängel im Herstellungswerkzeug auftreten noch Kalibrierungsprobleme des Werkstückes. Vor allen Dingen wird jedoch das Raum- und Flächenproblem gelöst, indem die Anker seitlich vorteilhaft geführt werden können. Die Erfindung eignet sich somit neben kleinen besonders für extrem hohe Systemzahlen.The object is achieved in that the radially inner magnetic yoke legs are formed into a closed ring, are formed on the radially inwardly directed teeth, in the tooth gaps in each case grip means for the hinged anchors that the guide means for the hinged anchors from each hinged anchor assigned in pairs there are rail-like projections, which each run in the lateral recesses of the hinged anchor and further in the lateral tooth gaps, the anchor width minus the recesses and the tooth width being of equal tolerance. Such an electromagnetic coil carrier can advantageously be produced from sintered or investment casting with a high degree of tolerance accuracy, with neither filling defects in the production tool nor calibration problems of the workpiece. Above all, however, the space and area problem is solved in that the anchors can be advantageously guided laterally. In addition to small, the invention is therefore particularly suitable for extremely high system numbers.

Die Lösung besitzt außer dem den Vorteil, daß die Querschnitte des Klappankers und der Magnetjochschenkelpaare an den Magnetfluß angepaßt sind, soweit dies erforderlich ist.The solution also has the advantage that the cross sections of the hinged armature and the magnet yoke leg pairs are adapted to the magnetic flux, insofar as this is necessary.

Eine weitere Verbesserung der Erfindung besteht darin, daß das einstückige Bauteil aus Sinter- oder Feinguß zu einem zentrischen Nabenteil weitergebildet ist. Diese Lösung erleichtert die Festlegung sämtlicher Klappanker bzw. sämtlicher Systeme.
Eine andere vorteilhafte Weiterentwicklung der Erfindung besteht darin, daß das Nabenteil aus einem Nabenboden und aus einer diesen mit dem geschlossenen radial inneren Ring verbindenden Scheibe besteht. Eine solche Gliederung, d.h. der Aufbau des Elektromagnetspulenträgers in einzeln stehende radial äußere Jochschenkel, radial innere Jochschenkel, die einen geschlossenen Ring bilden sowie in nach innen gerichtete Zähne, ferner in das Nabenteil und nunmehr auch noch in einen Nabenboden und diesen mit dem geschlossenen radial inneren Ring verbindenden Scheibe begünstigt die Herstellung des Elektromagnetspulenträgers beträchtlich und legt sämtliche funktionswichtigen Bauteile zueinander fest. Ein solcher Elektromagnetspulenträger kann daher mit geringsten Toleranzen hergestellt werden.Another improvement of the invention is that the one-piece component made of sintered or investment casting is further developed into a central hub part. This solution makes it easier to determine all hinged anchors or all systems.
Another advantageous further development of the invention consists in the fact that the hub part consists of a hub base and a disk that connects it to the closed radially inner ring. Such an arrangement, that is, the structure of the electromagnetic coil carrier in individually standing radially outer yoke legs, radially inner yoke legs, which form a closed ring and inwardly directed teeth, further into the hub part and now also in a hub base and this with the closed radially inner Ring connecting disc significantly favors the manufacture of the electromagnetic coil carrier and defines all functionally important components to each other. Such an electromagnetic coil carrier can therefore be manufactured with the smallest tolerances.

In weiterer Verbesserung der Erfindung ist vorgesehen, daß der Nabenboden gegenüber der Nabenscheibe eine erheblich größere Dicke besitzt. Diese Maßnahme führt zu einer besonderen Massenverteilung im Bereich der Auflage eines noch zu beschreibenden Dämpfungsringes, so daß die Rückprallerscheinungen der Klappanker mit den Drucknadeln in einen äußerst günstigen Schwingungsbereich verlegt werden können.In a further improvement of the invention it is provided that the hub base has a considerably greater thickness than the hub disk. This measure leads to a special mass distribution in the area of the support of a damping ring to be described, so that the rebound phenomena of the hinged anchors with the pressure needles can be moved into an extremely favorable vibration range.

Eine Führung des Magnetflusses sowie eine Werkstoffersparnis wird noch dadurch erzielt, daß in der Nabenscheibe über den Umfang verteilte, radial innere Ausnehmungen vorgesehen sind.A guidance of the magnetic flux and a saving of material is also achieved in that radially inner recesses are provided in the hub disk, which are distributed over the circumference.

Weitere Maßnahmen zur Beeinflussung des Magnetflusses bzw. zur günstigen Herstellung des Elektromagnetspulenträgers werden dadurch erzielt, indem an dem einstückigen Bauteil von den Magnetjochschenkelpaaren axial abgewandt, zwischen jeweils zwei am Umfang benachbarten Magnetjochschenkeln, Einkerbungen für die Magnetflußlenkung vorgesehen sind.Further measures for influencing the magnetic flux or for the cheap manufacture of the electromagnetic coil carrier are achieved in that on the one-piece component axially facing away from the pairs of magnetic yoke legs, notches for the magnetic flux steering are provided between each two adjacent magnetic yoke legs.

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

Fig. 1
einen axialen Längsschnitt durch den Matrixnadeldruckkopf,
Fig. 2
einen perspektivischen Querschnitt durch den Elektromagnetspulenträger,
Fig. 3
eine Teilansicht von unten gegen den Elektromagnetspulenträger in Richtung A gemäß Fig. 2,
Fig. 4
einen Querschnitt gemäß der Schnittangabe C - D aus Fig. 5 und
Fig. 5
eine Draufsicht auf Fig. 4 bzw. in Richtung B gemäß Fig. 2.
An embodiment of the invention is shown in the drawing and will be described in more detail below. Show it
Fig. 1
an axial longitudinal section through the matrix needle print head,
Fig. 2
3 shows a perspective cross section through the electromagnetic coil carrier,
Fig. 3
3 shows a partial view from below against the electromagnetic coil carrier in direction A according to FIG. 2,
Fig. 4
a cross section according to the section specification C - D of Fig. 5 and
Fig. 5
4 or in the direction B according to FIG. 2.

Der Matrixnadeldruckkopf der Klappankerbauart (Fig. 1) weist z.B. 9, 18, oder 24 Systeme auf, die jeweils aus einem Magnetjochschenkelpaar 1, einer auf einem der Magnetjochschenkel 1a aufgesteckten Elektromagnetspule 2, einem Klappanker 3 und einer Drucknadel 4 bestehen. Die Anzahl (9, 18, 24) dieser Systeme legt den Nenndurchmesser 5 fest. Die Systemzahl beträgt, wie gezeichnet, 24.The hinged anchor type matrix needle printhead (Fig. 1) has e.g. 9, 18 or 24 systems, each consisting of a pair of magnetic yoke legs 1, an electromagnetic coil 2 plugged onto one of the magnetic yoke legs 1a, a hinged armature 3 and a pressure needle 4. The number (9, 18, 24) of these systems defines the nominal diameter 5. The system number, as drawn, is 24.

Der Matrixnadeldruckkopf ist ferner in ein hinteres Druckkopfgehäuse 6 und ein vorderes Druckkopfgehäuse 7 gegliedert. Im vorderen Druckkopfgehäuse 7 sind die Drucknadeln 4 mittels Lagerscheiben 8 geführt bzw. gelagert. Alle 24 Drucknadeln 4 werden zu zwei Nadelspalten in einem Mundstück 9 zusammengeführt. Der komplette Matrixnadeldruckkopf ist außerdem durch zwei Führungszapfen 10 auf einem weiter nicht gezeigten Druckkopfschlitten justiert und befestigt.The matrix needle print head is further divided into a rear print head housing 6 and a front print head housing 7. In the front printhead housing 7, the printing needles 4 are guided or supported by means of bearing disks 8. All 24 printing needles 4 are brought together to form two needle gaps in a mouthpiece 9. The complete matrix needle printhead is also adjusted and fixed by two guide pins 10 on a printhead carriage, not shown.

Im hinteren Druckkopfgehäuse 6 befinden sich nahezu alle System-Bauteile und außerdem ein Elektromagnetspulenträger 11, der in den Figuren 2 bis 5 näher dargestellt ist. Der Magnetspulenträger 11 verbindet durch eine Schraube 12 über eine Gehäusenabe 13 das hintere Druckkopfgehäuse 6 mit dem vorderen Druckkopfgehäuse 7.Almost all system components and also an electromagnetic coil carrier 11, which is shown in more detail in FIGS. 2 to 5, are located in the rear printhead housing 6. The magnet coil carrier 11 connects the rear printhead housing 6 to the front printhead housing 7 by means of a screw 12 via a housing hub 13.

Der Elektromagnetspulenträger 11 besitzt radial außen (Fig. 2) einzelne Magnetjochschenkel 1a, die in ihrem Querschnitt 14 radial etwa auf eine Nadelangriffsstelle 15 (Fig. 1) ausgerichtet sind. Dadurch wird der Zwischenraum optimal für die Elektromagnetspule 2 ausgenutzt. Die gegenüberliegenden, radial inneren Magnetjochschenkel 1b sind im Gegensatz zu den einzelnen Magnetjochschenkeln 1a zu einem geschlossenen Ring 16 zusammengefaßt. Dieser Ring 16 bildet die Voraussetzung für weitere Maßnahmen, die Klappanker 3 zu lagern und zu führen. Zu diesem Zweck befinden sich an dem geschlossenen Ring 16 radial nach innen gerichtete Zähne 17, und zwar derart, daß die Ringbreite 16a durch einen Zahn 17 in radialer Richtung vergrößert wird, wodurch eine Vergrößerung der die Magnetflußfäden führenden Fläche erzielt wird. Gleichzeitig wird jedoch durch einen Zahn 17 eine Zahnlücke 18 geschaffen, in die Führungsmittel 19 (Fig. 1) für die Klappanker 3 greifen können, ohne sich seitlich zu stören.The electromagnetic coil support 11 has radially outside (FIG. 2) individual magnetic yoke legs 1a, which in their cross-section 14 are aligned radially approximately to a needle engagement point 15 (FIG. 1). As a result, the space is optimally used for the electromagnetic coil 2. In contrast to the individual magnetic yoke legs 1a, the opposite, radially inner magnetic yoke legs 1b are combined to form a closed ring 16. This ring 16 forms the prerequisite for further measures to store and guide the hinged anchor 3. For this purpose, there are radially inwardly directed teeth 17 on the closed ring 16, in such a way that the ring width 16a is enlarged in the radial direction by a tooth 17, whereby an increase in the area guiding the magnetic flux threads is achieved. At the same time, however, a tooth gap 18 is created by a tooth 17, into which guide means 19 (FIG. 1) for the hinged anchors 3 can engage without interfering laterally.

Die Nadelangriffsstelle 15 kann aus einem Klappanker 3 bestehen, an dem ein Drucknadelkopf 4a lose anliegt. Der Klappanker 3 kann jedoch auch fest mit der Drucknadel 4 an der Nadelangriffsstelle 15, z.B. durch Schweißen, verbunden sein.The needle engagement point 15 can consist of a folding anchor 3, against which a pressure needle head 4a loosely rests. However, the hinged anchor 3 can also be firmly attached to the pressure needle 4 at the needle engagement point 15, e.g. by welding.

Im vorliegenden Ausführungsbeispiel bestehen die Führungsmittel 19 aus schienenähntichen Vorsprüngen 20, die jeweils seitlich in seitlichen Ausnehmungen 3a der Klappanker 3 verlaufen. Diese seitlichen Ausnehmungen 3a der Klappanker 3 lassen eine gleitende Bewegung desIn the present exemplary embodiment, the guide means 19 consist of protrusions 20 similar to rails, which each extend laterally in lateral recesses 3a of the hinged anchors 3. These lateral recesses 3a of the hinged anchor 3 allow the sliding movement of the

Claims (10)

  1. A dot-matrix pin printer head of the hinged armature type comprising a plurality of systems, each of which consists of a pair of magnet yoke legs (1), an electromagnetic coil (2), a hinged armature (3) and a printing pin (4), wherein a larger number of systems is based on an outer printer head diameter as nominal diameter (4) or wherein a smaller number of systems is associated with a smaller printer head diameter than the nominal diameter (5), also comprising an electromagnetic coil carrier (11) which is produced from sintered or fine cast material and, together with a base plate and the pairs of magnet yoke legs (1), forms an integral component (21), wherein the electromagnetic coil carrier (11) radially externally comprises individual magnet yoke legs (1a) which are each aligned with a pin application point (15) between the pin head (4a) and the hinged armature (3), characterised in that the radially inner magnet yoke legs (1b) form a closed ring (16) on which are formed radially inwardly directed teeth (17), in the tooth gaps (18) of which respective guide means (19) for the hinged armatures (3) engage, and that the guide means (19) for the hinged armatures (3) consist of rail-like projections (20) which are assigned in pairs to each hinged armature (3) and which each extend in lateral cut-outs (3a) of the hinged armature (3) and further in the lateral tooth gaps (18), where the width (3b) of the armatures, minus the cut-outs (3a), and the width (17a) of the teeth are equal within tolerances.
  2. A dot-matrix pin printer head as claimed in Claim 1, characterised in that the integral component (21) composed of sintered or fine cast material is further developed to form a central hub member (22).
  3. A dot-matrix pin printer head as claimed in Claims 1 and 2, characterised in that the hub member (22) consists of a hub base (23) and a disc (24) which connects said hub base (23) to the closed, radially inner ring (16).
  4. A dot-matrix pin printer head as claimed in Claim 3, characterised in that the hub base (23) possesses a substantially greater thickness (26) than the hub disc (24).
  5. A dot-matrix pin printer head as claimed in Claims 1 to 4, characterised in that radially inner cut-outs (27) are provided in the hub disc (24) distributed over the periphery thereof.
  6. A dot-matrix pin printer head as claimed in one or more of Claims 1 to 5, characterised in that on the integral component (21), facing away from the pairs of magnet yoke legs (1) in the axial direction, indentations (28) for the guidance of the magnetic flux are provided between two respective, peripherally adjacent magnet yoke legs (1a).
EP88730265A 1988-12-01 1988-12-01 Wire matrix printhead of the clapper type Expired - Lifetime EP0371182B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE8888730265T DE3879212D1 (en) 1988-12-01 1988-12-01 FOLDING NEEDLE PRINT HEAD PRINT HEAD.
EP88730265A EP0371182B1 (en) 1988-12-01 1988-12-01 Wire matrix printhead of the clapper type
AT88730265T ATE86552T1 (en) 1988-12-01 1988-12-01 MATRIX PIN PRINT HEAD OF FLAP ANCHOR DESIGN.
JP1310460A JPH02188265A (en) 1988-12-01 1989-11-29 Dot matrix printing head of flap type amateur structure
US07/443,755 US4979836A (en) 1988-12-01 1989-11-30 Matrix pin print head of the hinged-clapper-armature construction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88730265A EP0371182B1 (en) 1988-12-01 1988-12-01 Wire matrix printhead of the clapper type

Publications (2)

Publication Number Publication Date
EP0371182A1 EP0371182A1 (en) 1990-06-06
EP0371182B1 true EP0371182B1 (en) 1993-03-10

Family

ID=8200563

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88730265A Expired - Lifetime EP0371182B1 (en) 1988-12-01 1988-12-01 Wire matrix printhead of the clapper type

Country Status (5)

Country Link
US (1) US4979836A (en)
EP (1) EP0371182B1 (en)
JP (1) JPH02188265A (en)
AT (1) ATE86552T1 (en)
DE (1) DE3879212D1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004028904A1 (en) * 2004-06-15 2006-01-12 Tallygenicom Computerdrucker Gmbh Print head for use particularly with a needle matrix printer has ring formed yoke with non ferro-magnetic carrier
DE102005021199B4 (en) * 2005-05-07 2013-06-06 Dascom Europe Gmbh Matrix needle printhead for computer printers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5215389A (en) * 1990-02-28 1993-06-01 Citizen Watch Co., Ltd. Print head for a dot matrix printer

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3860895A (en) * 1974-05-28 1975-01-14 Honeywell Inf Systems Magnetic shunt assembly for bias field apparatus
US4273452A (en) * 1978-09-29 1981-06-16 Tokyo Shibaura Denki Kabushiki Kaisha Print head for a dot printer
IT1128976B (en) * 1980-08-21 1986-06-04 Olivetti & Co Spa BALLISTIC WIRE PRINT HEAD
DE3243475A1 (en) * 1982-11-22 1984-05-24 Mannesmann AG, 4000 Düsseldorf NEEDLE PRINT HEAD FOR MATRIX PRINTER
JPS59101373A (en) * 1982-12-01 1984-06-11 Tokyo Electric Co Ltd Dot printer head
JPS6067170A (en) * 1983-09-26 1985-04-17 Tokyo Electric Co Ltd Dot printer head
JPS60193661A (en) * 1984-03-15 1985-10-02 Tokyo Electric Co Ltd Head for dot printer
JPS6323041U (en) * 1986-07-28 1988-02-16
JPS6384942A (en) * 1986-09-30 1988-04-15 Toshiba Corp Printer head yoke core

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004028904A1 (en) * 2004-06-15 2006-01-12 Tallygenicom Computerdrucker Gmbh Print head for use particularly with a needle matrix printer has ring formed yoke with non ferro-magnetic carrier
DE102004028904B4 (en) * 2004-06-15 2006-08-17 Tallygenicom Computerdrucker Gmbh Print head for use particularly with a needle matrix printer has ring formed yoke with non ferro-magnetic carrier
DE102005021199B4 (en) * 2005-05-07 2013-06-06 Dascom Europe Gmbh Matrix needle printhead for computer printers

Also Published As

Publication number Publication date
EP0371182A1 (en) 1990-06-06
DE3879212D1 (en) 1993-04-15
JPH02188265A (en) 1990-07-24
ATE86552T1 (en) 1993-03-15
US4979836A (en) 1990-12-25

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