EP0371183B1 - Wire matrix print head of the clapper type - Google Patents

Wire matrix print head of the clapper type Download PDF

Info

Publication number
EP0371183B1
EP0371183B1 EP88730266A EP88730266A EP0371183B1 EP 0371183 B1 EP0371183 B1 EP 0371183B1 EP 88730266 A EP88730266 A EP 88730266A EP 88730266 A EP88730266 A EP 88730266A EP 0371183 B1 EP0371183 B1 EP 0371183B1
Authority
EP
European Patent Office
Prior art keywords
hinged
electromagnet coil
closed
needle
print head
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
EP88730266A
Other languages
German (de)
French (fr)
Other versions
EP0371183A1 (en
Inventor
Bernd Gugel
Clemens Kaufmann
Herbert Kitzberger
Kurt Röhrer
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 AT88730266T priority Critical patent/ATE105782T1/en
Priority to EP88730266A priority patent/EP0371183B1/en
Priority to DE3889662T priority patent/DE3889662D1/en
Priority to JP1310461A priority patent/JPH02188266A/en
Priority to US07/443,754 priority patent/US5009529A/en
Publication of EP0371183A1 publication Critical patent/EP0371183A1/en
Application granted granted Critical
Publication of EP0371183B1 publication Critical patent/EP0371183B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B41J2/235—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 several systems, each consisting of a pair of magnetic yoke legs, an electromagnetic coil, a hinged armature and a pressure needle, further with an electromagnetic coil carrier, which is made of sintered or investment casting, and together with a base plate and the magnetic yoke leg pairs, a one-piece component forms, the electromagnetic coil carrier has radially outer individual magnetic yoke snails, each of which is aligned with a needle application point or needle attachment point, the radially inner magnetic yokes being formed into a closed, circular or polygonal ring, and with the hinged armatures being guided by the pivoting movements of the armatures Interacting means cooperate on the closed ring are assigned.
  • 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 defects 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 side of the magnet yoke legs or to guide the anchors.
  • Such a matrix needle printhead is also known from EP-A-0 141 522, in which guide holes are shown in which cylindrical pins made of elastic materials such as rubber engage, the latter being part of the needle guide housing.
  • these web-shaped pins because they are attached to the needle guide housing, exert a joint-like effect in one plane.
  • pins can only influence the pivoting movement of the armature by their elasticity. In the long run, however, the necessary accuracy of the guidance cannot be maintained here.
  • the invention is based on the object, in particular for low-number systems (such as nine needles) without sacrificing magnetic energy, to propose such an anchor guide in which the individual hinged anchors are mounted in an extremely precisely defined manner.
  • the receiving means consist of depressions, engage in each of the guide means, which are formed from projections, and that the projections protrude at the same time after assembly in pairs of incisions of the hinged anchors and engage with a section projecting above the hinged anchors in the recesses of the radially inner closed ring.
  • the magnetic flux is guided precisely and optimally by the closed radially inner ring, and the hinged anchors are very precisely supported by the radially inner ring, which can be produced very precisely, because the receiving means can be positioned very precisely on the closed ring.
  • One measure to optimize the magnetic flux is that the width of the closed, circular or polygonal ring is adapted to the required magnetic flux.
  • the hinged anchor type matrix needle printhead (Fig. 1) has e.g. nine, twelve, 18 or 24 needles 1.
  • Each pressure needle 1 is assigned a pair of magnetic yoke legs 2, an electromagnetic coil 3 and a hinged armature 4, the electromagnetic coil 3 being plugged onto a radially outer magnetic yoke leg 2a.
  • Nine such systems are shown.
  • the pressure needles 1 are guided in a pressure needle guide housing 5 by means of individual guide walls 6, the bores 7 of which define the arcuate course from a needle engagement point 8 of a pressure needle head 8a and the hinged anchor 4 to a mouthpiece 9, the mouthpiece 9 being at a distance from the pressure abutment, not shown Needle stroke lies with the record carrier lying on the pressure abutment.
  • the needle engagement point 8 can also consist of a needle attachment point 8b, at which the hinged anchor 4 is welded to the pressure needle 2. In the mouthpiece 9, all nine printing needles 1 are guided one above the other to form a vertical needle gap and stored.
  • the pressure needle guide housing 5 forms in the area of the hinged armature 4 a shell 5a corresponding to the outer diameter (nominal diameter) of the matrix needle printhead, which shell is also equipped with special functions or features.
  • a guide bush 10 in the center of the shell 5a, which forms an abutment for a compression spring 11, which is assigned to each pressure needle 1. Further features and functions of the shell 5a will be described later.
  • a rear housing 12 which accommodates the systems and is made of plastic or aluminum (magnetically non-conductive materials), centers a one-piece electromagnetic coil carrier 13 made of sintered or investment casting.
  • the one-piece, very precise and high-quality electromagnetic coil carrier 13 is magnetically insulated by electrically non-conductive fillers 14 within the rear housing 12.
  • the housing 12 made of aluminum is also provided with a central, heat-resistant, damped washer 15 on which the radially inner armature arms 4a lie in a basic or rest position.
  • the hinged anchors 4 are fixed to the radially inner arm 4a by this damping disc 15 and pivotally mounted approximately in the middle by an elastic damping ring 16 with a square cross section and by the radially inner magnetic yoke leg of the pair of magnetic yoke legs 2.
  • the one-piece electromagnetic coil carrier 13 forms the individual magnetic yoke legs 2a radially on the outside and the associated radially inner magnetic yoke legs form a closed ring 17 which is circular or polygonal and shaped according to the number of systems.
  • the folding anchors 4 perform pivoting movements in order to give the printing needles 1 a lifting movement. Such lifting movements (forward and return stroke are approx. 0.3 mm) are carried out with a frequency of 2000 to 3000 Hz.
  • guide means 18 are required, which interact with receiving means 19 (FIG. 2) on the closed ring 17.
  • the receiving means 19 consist of depressions 20, into which protrusions 21 of similar shape project as guide means 18 to the depressions 20.
  • the projections 21 have a boundary side 21a and a boundary side 21b.
  • One of the two boundary sides 21a and 21b protrudes in pairs in cuts 4b, 4c of the hinged anchors 4.
  • the projections 21 also protrude in these notches 4b, 4c from the hinged anchors 4 with sections 21c. With these sections 21c, the projections 21 engage in the recesses 20 of the radially inner closed ring 17.
  • the projections 21 center both the hinged anchors 4, thus forming guide means 18 which are positioned on their pivoting movements and which cooperate with the receiving means 19 on the closed ring 17.
  • the hinged anchors 4 are additionally guided in the region of the radially inner arm 4a by means of cams 22.
  • the shell 5a is moved from the inverted position shown in Fig. 3 (for a better view) to the operating position shown in Fig. 4, i.e. placed in the inverted position on the ring 17 in Fig. 2.
  • the direction of the course of the printing needles 1 in FIGS. 2 and 3 serves for orientation during this placement process.
  • connecting lines 23 are guided through the filling compound 14 to a printed circuit board 24.
  • the circuit board 24 is protected by a cover 25.
  • the pressure needle guide housing 5 or the shell 5a and the rear housing 12 are held together by several screws 26 with nuts 27.
  • the width 17a of the ring 17 (FIG. 4) serves as an adjustment measure for the optimization of the magnetic flux in order to work with the most favorable magnetic saturation.
  • the entire matrix print head shown in FIG. 1 is placed on a print head carriage by means of a pair of dowel pins 28.

Landscapes

  • Impact Printers (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Golf Clubs (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)

Abstract

A wire matrix print head of the clapper type has a plurality of systems which are composed in each case of a pair of magnet yoke limbs (2), an electromagnet coil (3), a clapper (4) and a printing needle (1) and, furthermore, have an electromagnet coil carrier (13) which is made of iron sinter or precision casting and, together with a base plate and the pairs of magnet yoke limbs (2), forms a one-piece component. <??>In order to achieve anchor guiding, in particular for low-number systems (such as, for example, nine needles) without using up magnetic energy, in which the individual clappers (4) are mounted with extreme precision, it is proposed that the electromagnet coil carrier (13) has individual magnet yoke limbs (2a) arranged radially on the outside which are each aligned onto a needle contact point (8) or onto a needle attachment point (8b), that the radially inner magnet yokes are shaped to form a closed, circular or polygonal ring (17), and that the clappers (4) are each assigned guide means (18) which are coordinated with the swivel movements of the clappers and interact with receiving means (19) on the closed ring (17). <IMAGE>

Description

Die Erfindung betrifft einen Matrixnadeldruckkopf der Klappankerbauart mit mehreren Systemen, die jeweils aus einem Magnetjochschenkelpaar, einer Elektromagnetspule, einem Klappanker und einer Drucknadel bestehen, ferner mit einem Elektromagnetspulenträger, der aus Sinter oder Feinguß hergestellt ist und zusammen mit einer Grundplatte und den Magnetjochschenkelpaaren einen einstückigen Bauteil bildet, wobei der Elektromagnetspulenträger radial außen einzelne Magnetjochschnnel aufweist, die jeweils auf eine Nadelangriffsstelle bzw. Nadelbefestigungstelle ausgerichtet sind, wobei die radial inneren Magnetjoche zu einem geschlossenen, Kreisrunden oder polygonalen Ring geformt sind und wobei den Klappankern jeweils auf deren Schwenkbewegungen abgestellte Führungsmittel, die mit Aufnahmemitteln an dem geschlossenen Ring zusammenwirken, zugeordnet sind.The invention relates to a matrix needle printhead of the hinged armature type with several systems, each consisting of a pair of magnetic yoke legs, an electromagnetic coil, a hinged armature and a pressure needle, further with an electromagnetic coil carrier, which is made of sintered or investment casting, and together with a base plate and the magnetic yoke leg pairs, a one-piece component forms, the electromagnetic coil carrier has radially outer individual magnetic yoke snails, each of which is aligned with a needle application point or needle attachment point, the radially inner magnetic yokes being formed into a closed, circular or polygonal ring, and with the hinged armatures being guided by the pivoting movements of the armatures Interacting means cooperate on the closed ring are assigned.

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 fächenbeanspruchend. 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 defects 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 side of the magnet yoke legs or to guide the anchors.

Ein solcher Matrixnadeldruckkopf ist außerdem aus der EP-A-0 141 522 bekannt, in der Führungslöcher gezeigt sind, in die zylindrische, aus elastischen Stoffen, wie Gummi, bestehende Zapfen eingreifen, wobei letztere Teil des Nadelführungsgehäuses sind. Insofern üben diese stegförmigen Zapfen, weil sie am Nadelführungsgehäuse befestigt sind, eine gelenkartige Wirkung in einer Ebene aus. Solche Zapfen können jedoch nur durch ihre Elastizität auf die Schwenkbewegung des Ankers Einfluß nehmen. Auf Dauer kann die notwendige Genauigkeit der Führung hier jedoch nicht eingehalten werden.Such a matrix needle printhead is also known from EP-A-0 141 522, in which guide holes are shown in which cylindrical pins made of elastic materials such as rubber engage, the latter being part of the needle guide housing. In this respect, these web-shaped pins, because they are attached to the needle guide housing, exert a joint-like effect in one plane. However, such pins can only influence the pivoting movement of the armature by their elasticity. In the long run, however, the necessary accuracy of the guidance cannot be maintained here.

Der Erfindung liegt die Aufgabe zugrunde, insbesondere für niedrigzahlige Systeme (wie z.B. neun Nadeln) ohne Einbuße von magnetischer Energie eine solche Ankerführung vorzuschlagen, bei der die einzelnen Klappanker äußerst genau bestimmt gelagert sind.The invention is based on the object, in particular for low-number systems (such as nine needles) without sacrificing magnetic energy, to propose such an anchor guide in which the individual hinged anchors are mounted in an extremely precisely defined manner.

Die gestellte Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Aufnahmemittel aus Vertiefungen bestehen, in die jeweils die Führungsmittel eingreifen, die aus Vorsprüngen gebildet sind, und daß die Vorsprünge gleichzeitig nach Montage in paarweise Einschnitte der Klappanker ragen und mit einem die Klappanker jeweils überragenden Abschnitt in die Vertiefungen des radial inneren geschlossenen Rings eingreifen.The object is achieved in that the receiving means consist of depressions, engage in each of the guide means, which are formed from projections, and that the projections protrude at the same time after assembly in pairs of incisions of the hinged anchors and engage with a section projecting above the hinged anchors in the recesses of the radially inner closed ring.

Durch den geschlossenen radial inneren Ring wird der Magnetfluß genau und optimal geführt, und die Klappanker werden durch den sehr genau herstellbaren radial inneren Ring sehr genau gelagert, weil die Aufnahmemittel an dem geschlossenen Ring sehr genau positioniert werden können.The magnetic flux is guided precisely and optimally by the closed radially inner ring, and the hinged anchors are very precisely supported by the radially inner ring, which can be produced very precisely, because the receiving means can be positioned very precisely on the closed ring.

Von besonderen Vorteil ist es, daß beim Zusammenbau der beiden Gehäusehälften die Klappanker automatisch in axialer wie in radialer Richtung präzise geführt und gleichzeitig die beiden Gehäusehälften gegeneinander fixiert werden, ohne daß zu hohe Anforderungen an die Toleranz der Teile gestellt werden müssen.It is of particular advantage that when the two housing halves are assembled, the hinged anchors are automatically guided precisely in the axial as well as in the radial direction and, at the same time, the two housing halves are fixed against one another without having to make excessive demands on the tolerance of the parts.

Eine Maßnahme zur Optimierung des Magnetflusses besteht noch darin, daß die Breite des geschlossenen, kreisrunden oder polygonalen Rings dem erforderlichen Magnetfluß angepaßt ist.One measure to optimize the magnetic flux is that the width of the closed, circular or polygonal ring is adapted to the required magnetic flux.

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
eine perspektivische Darstellung des einstückigen Elektromagnetspulenträgers mit zwei einzelnen Klappankern und Drucknadeln,
Fig. 3
eine perspektivische Darstellung des im montierten Zustand dem Elektromagnetspulenträger aus Fig. 2 gegenüberliegenden Teils eines Nadelführungsgehäuses und
Fig. 4
einen axialen Teillängsschnitt mit einstückigem Elektromagnetspulenträger, Klappanker und dem Nadelführungsgehäuse.
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
1 shows a perspective view of the one-piece electromagnetic coil carrier with two individual hinged armatures and pressure needles,
Fig. 3
a perspective view of the part of a needle guide housing opposite the electromagnetic coil carrier from FIG. 2 in the assembled state and
Fig. 4
an axial partial longitudinal section with one-piece electromagnetic coil carrier, hinged armature and the needle guide housing.

Der Matrixnadeldruckkopf der Klappankerbauart (Fig. 1) weist z.B. neun, zwölf, 18 oder 24 Drucknadeln 1 auf. Jeder Drucknadel 1 ist ein Magnetjochschenkelpaar 2, eine Elektromagnetspule 3 und ein Klappanker 4 zugeordnet, wobei die Elektromagnetspule 3 auf einen radial äußeren Magnetjochschenkel 2a aufgesteckt ist. Es sind neun solcher Systeme dargestellt.The hinged anchor type matrix needle printhead (Fig. 1) has e.g. nine, twelve, 18 or 24 needles 1. Each pressure needle 1 is assigned a pair of magnetic yoke legs 2, an electromagnetic coil 3 and a hinged armature 4, the electromagnetic coil 3 being plugged onto a radially outer magnetic yoke leg 2a. Nine such systems are shown.

Die Drucknadeln 1 sind in einem Drucknadelführungsgehäuse 5 mittels einzelner Führungswände 6 geführt, deren Bohrungen 7 den bogenförmigen Verlauf von einer Nadelangriffsstelle 8 eines Drucknadelkopfes 8a und dem Klappanker 4 bis zu einem Mundstück 9 festlegen, wobei das Mundstück 9 gegenüber einem nicht gezeichneten Druckwiderlager mit Abstand des Nadelhubes bei auf dem Druckwiderlager aufliegenden Aufzeichnungsträger liegt. Die Nadelangriffsstelle 8 kann auch aus einer Nadelbefestigungsstelle 8b bestehen, an der der Klappanker 4 mit der Drucknadel 2 verschweißt ist. Im Mundstück 9 sind sämtliche neun Drucknadeln 1 zu einer senkrechten Nadelspalte übereinander geführt und gelagert.The pressure needles 1 are guided in a pressure needle guide housing 5 by means of individual guide walls 6, the bores 7 of which define the arcuate course from a needle engagement point 8 of a pressure needle head 8a and the hinged anchor 4 to a mouthpiece 9, the mouthpiece 9 being at a distance from the pressure abutment, not shown Needle stroke lies with the record carrier lying on the pressure abutment. The needle engagement point 8 can also consist of a needle attachment point 8b, at which the hinged anchor 4 is welded to the pressure needle 2. In the mouthpiece 9, all nine printing needles 1 are guided one above the other to form a vertical needle gap and stored.

Das Drucknadelführungsgehäuse 5 bildet im Bereich der Klappanker 4 eine dem äußeren Durchmesser (Nenndurchmesser) des Matrixnadeldruckkopfes entsprechende Schale 5a, die noch mit besonderen Funktionen oder Merkmalen ausgestattet ist. So befindet sich im Zentrum der Schale 5a eine Führungsbuchse 10, die ein Widerlager für eine Druckfeder 11 bildet, die jeder Drucknadel 1 zugeordnet ist. Weitere Merkmale und Funktionen der Schale 5a werden später beschrieben.The pressure needle guide housing 5 forms in the area of the hinged armature 4 a shell 5a corresponding to the outer diameter (nominal diameter) of the matrix needle printhead, which shell is also equipped with special functions or features. There is a guide bush 10 in the center of the shell 5a, which forms an abutment for a compression spring 11, which is assigned to each pressure needle 1. Further features and functions of the shell 5a will be described later.

Ein die Systeme aufnehmendes hinteres Gehäuse 12, das aus Kunststoff oder Aluminium (magnetisch nicht leitenden Werkstoffen) hergestellt ist, zentriert einen einstückigen Elektromagnetspulenträger 13 aus Sinter oder Feinguß. Der einteilige, sehr genau und von hoher Oberflächengüte hergestellte Elektromagnetspulenträger 13 liegt magnetisch durch elektrisch nicht leitende Füllstoffe 14 isoliert innerhalb des hinteren Gehäuses 12. Das Gehäuse 12 aus Aluminium ist außerdem mit einer zentrischen, wärmebeständig aufgeklebten Dämpfungsscheibe 15 versehen, auf der die radial inneren Ankerarme 4a in einer Grund- oder Ruhestellung aufliegen.A rear housing 12, which accommodates the systems and is made of plastic or aluminum (magnetically non-conductive materials), centers a one-piece electromagnetic coil carrier 13 made of sintered or investment casting. The one-piece, very precise and high-quality electromagnetic coil carrier 13 is magnetically insulated by electrically non-conductive fillers 14 within the rear housing 12. The housing 12 made of aluminum is also provided with a central, heat-resistant, damped washer 15 on which the radially inner armature arms 4a lie in a basic or rest position.

Die Klappanker 4 sind mit den radial inneren Ankerarmen 4a durch diese Dämpfungsscheibe 15 festgelegt und etwa mittig durch einen im Querschnitt quadratischen elastischen Dämpfungsring 16 sowie durch den radial inneren gegenüberliegenden Magnetjochschenkel des Magnetjochschenkelpaares 2 schwenkgelagert.The hinged anchors 4 are fixed to the radially inner arm 4a by this damping disc 15 and pivotally mounted approximately in the middle by an elastic damping ring 16 with a square cross section and by the radially inner magnetic yoke leg of the pair of magnetic yoke legs 2.

Der einstückige Elektromagnetspulenträger 13 bildet radial außen die einzelnen Magnetjochschenkel 2a und die zugehörigen radial inneren Magnetjochschenkel bilden einen geschlossenen Ring 17, der kreisrund oder polygonal und nach der Anzahl der Systeme geformt ist.The one-piece electromagnetic coil carrier 13 forms the individual magnetic yoke legs 2a radially on the outside and the associated radially inner magnetic yoke legs form a closed ring 17 which is circular or polygonal and shaped according to the number of systems.

Die Klappanker 4 führen Schwenkbewegungen aus, um den Drucknadeln 1 eine Hubbewegung zu erteilen. Derartige Hubbewegungen (Vor- und Rückhub betragen ca. 0,3 mm) werden mit einer Frequenz von 2000 bis 3000 Hz ausgeführt. Um die Klappanker-Schwenkbewegungen schwingungstechnisch einwandfrei auszuführen, sind Führungsmittel 18 notwendig, die mit Aufnahmemitteln 19 (Fig. 2) an dem geschlossenen Ring 17 zusammenwirken.The folding anchors 4 perform pivoting movements in order to give the printing needles 1 a lifting movement. Such lifting movements (forward and return stroke are approx. 0.3 mm) are carried out with a frequency of 2000 to 3000 Hz. In order to carry out the hinged armature swiveling movements in a technically correct manner, guide means 18 are required, which interact with receiving means 19 (FIG. 2) on the closed ring 17.

Im konkreten Ausführungsbeispiel (Fig. 2 bis 4) bestehen die Aufnahmemittel 19 aus Vertiefungen 20, in die als Führungsmittel 18 zu den Vertiefungen 20 formähnliche Vorsprünge 21 ragen. Die Vorsprünge 21 weisen eine Begrenzungsseite 21a und eine Begrenzungsseite 21b auf. Eine der beiden Begrenzungsseiten 21a bzw. 21b ragt in paarweise Einschnitte 4b, 4c der Klappanker 4. Die Vorsprünge 21 überragen jedoch auch in diesen Einschnitten 4b, 4c die Klappanker 4 mit Abschnitten 21c. Mit diesen Abschnitten 21c greifen die Vorsprünge 21 in die Vertiefungen 20 des radial inneren geschlossenen Rings 17 ein. Die Vorsprünge 21 zentrieren sowohl die Klappanker 4, bilden somit auf deren Schwenkbewegungen abgestellte Führungsmittel 18, die mit den Aufnahmemitteln 19 an dem geschlossenen Ring 17 zusammenwirken.In the specific exemplary embodiment (FIGS. 2 to 4), the receiving means 19 consist of depressions 20, into which protrusions 21 of similar shape project as guide means 18 to the depressions 20. The projections 21 have a boundary side 21a and a boundary side 21b. One of the two boundary sides 21a and 21b protrudes in pairs in cuts 4b, 4c of the hinged anchors 4. However, the projections 21 also protrude in these notches 4b, 4c from the hinged anchors 4 with sections 21c. With these sections 21c, the projections 21 engage in the recesses 20 of the radially inner closed ring 17. The projections 21 center both the hinged anchors 4, thus forming guide means 18 which are positioned on their pivoting movements and which cooperate with the receiving means 19 on the closed ring 17.

Die Klappanker 4 sind im Bereich des radial inneren Ankerarmes 4a jeweils mittels Nocken 22 zusätzlich geführt. Die Schale 5a wird von der in Fig. 3 dargestellten umgedrehten Lage (für einen besseren Einblick) in die in Fig. 4 gezeigte Betriebslage, d.h. in umgedrehter Lage auf den Ring 17 in Fig. 2 aufgesetzt. Zur Orientierung bei diesem Aufsetzvorgang dient die Richtung des Verlaufs der Drucknadeln 1 in den Fig. 2 und 3.The hinged anchors 4 are additionally guided in the region of the radially inner arm 4a by means of cams 22. The shell 5a is moved from the inverted position shown in Fig. 3 (for a better view) to the operating position shown in Fig. 4, i.e. placed in the inverted position on the ring 17 in Fig. 2. The direction of the course of the printing needles 1 in FIGS. 2 and 3 serves for orientation during this placement process.

Von den Elektromagnetspulen 3 sind (Fig. 1) Anschlußleitungen 23 durch die Füllmasse 14 zu einer Leiterplatine 24 geführt. Die Leiterplatine 24 wird durch einen Deckel 25 geschützt. Das Drucknadelführungsgehäuse 5 bzw. die Schale 5a und das hintere Gehäuse 12 werden durch mehrere Schrauben 26 mit Muttern 27 zusammengehalten.From the electromagnetic coils 3 (FIG. 1), connecting lines 23 are guided through the filling compound 14 to a printed circuit board 24. The circuit board 24 is protected by a cover 25. The pressure needle guide housing 5 or the shell 5a and the rear housing 12 are held together by several screws 26 with nuts 27.

Die Breite 17a des Ringes 17 (Fig. 4) dient als Einstellungsmaßnahme für die Optimierung des Magnetflusses, um mit der günstigsten magnetischen Sättigung zu arbeiten.The width 17a of the ring 17 (FIG. 4) serves as an adjustment measure for the optimization of the magnetic flux in order to work with the most favorable magnetic saturation.

Der gesamte in Fig. 1 dargestellte Matrixdruckkopf wird mittels eines Paares von Paßstiften 28 auf einen Druckkopfschlitten aufgesetzt.The entire matrix print head shown in FIG. 1 is placed on a print head carriage by means of a pair of dowel pins 28.

Claims (2)

  1. A wire matrix print head of the hinged armature type, having a plurality of systems, each of which consists of a pair of magnet yoke arms (2), an electromagnet coil (3), a hinged armature (4) and a print wire (1), and also with an electromagnet coil holder (13), which is made of sinter or of precision casting and together with a base plate and the pairs of magnet yoke arms (2) forms an integral component, in which the electromagnet coil holder (13) has radially on the outside individual magnet coil arms (2a) which are each directed at a wire contact point (8) or wire attachment point (8b), the radially inner magnet yokes being formed into a closed, circular or polygonal ring (17), and in which guide means (18) which are geared to the pivoting movements of the hinged armatures in each case and which cooperate with receiving means (19) on the closed ring (17) are associated with the hinged armatures (4),
    characterised in that
    the receiving means (19) consist of recesses (20) into which the guide means (18), which are formed of projections (21), engage in each case, and that the projections (21) at the same time after assembly project into paired indentations (4b, 4c) in the hinged armatures (4) and engage in the recesses (20) of the radially inner, closed ring (17) with a section (21c) which projects across the hinged armature (4) in each case.
  2. A wire matrix print head according to Claim 1,
    characterised in that the width (17a) of the closed, circular or polygonal ring (17) is matched to the required magnetic flux.
EP88730266A 1988-12-01 1988-12-01 Wire matrix print head of the clapper type Expired - Lifetime EP0371183B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AT88730266T ATE105782T1 (en) 1988-12-01 1988-12-01 MATRIX PIN PRINT HEAD OF FLAP ANCHOR DESIGN.
EP88730266A EP0371183B1 (en) 1988-12-01 1988-12-01 Wire matrix print head of the clapper type
DE3889662T DE3889662D1 (en) 1988-12-01 1988-12-01 Folding anchor type matrix needle printhead.
JP1310461A JPH02188266A (en) 1988-12-01 1989-11-29 Dot matrix printing head of flap type amateur structure
US07/443,754 US5009529A (en) 1988-12-01 1989-11-30 Matrix print head of hinged-clapper-armature construction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88730266A EP0371183B1 (en) 1988-12-01 1988-12-01 Wire matrix print head of the clapper type

Publications (2)

Publication Number Publication Date
EP0371183A1 EP0371183A1 (en) 1990-06-06
EP0371183B1 true EP0371183B1 (en) 1994-05-18

Family

ID=8200564

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88730266A Expired - Lifetime EP0371183B1 (en) 1988-12-01 1988-12-01 Wire matrix print head of the clapper type

Country Status (5)

Country Link
US (1) US5009529A (en)
EP (1) EP0371183B1 (en)
JP (1) JPH02188266A (en)
AT (1) ATE105782T1 (en)
DE (1) DE3889662D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102744974A (en) * 2011-04-19 2012-10-24 多美科信息科技（深圳）有限公司 Needle type printing head

Families Citing this family (3)

* 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
AU722281B2 (en) 1997-03-21 2000-07-27 Procter & Gamble Company, The Absorbent article wrapper comprising a side flap fastener cover
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

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE3340596A1 (en) * 1982-11-16 1984-05-24 Tokyo Electric Co., Ltd., Tokyo 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
JPS60189457A (en) * 1984-03-08 1985-09-26 Tokyo Electric Co Ltd Dot printer head
JPS60193661A (en) * 1984-03-15 1985-10-02 Tokyo Electric Co Ltd Head for dot printer
DE3412855A1 (en) * 1984-04-03 1985-10-03 Mannesmann AG, 4000 Düsseldorf MATRIX PRINT HEAD
US4594010A (en) * 1984-04-23 1986-06-10 Bsr, Ltd. Wire matrix print head

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102744974A (en) * 2011-04-19 2012-10-24 多美科信息科技（深圳）有限公司 Needle type printing head

Also Published As

Publication number Publication date
EP0371183A1 (en) 1990-06-06
JPH02188266A (en) 1990-07-24
DE3889662D1 (en) 1994-06-23
US5009529A (en) 1991-04-23
ATE105782T1 (en) 1994-06-15

Similar Documents

Publication Publication Date Title
DE2201049B2 (en) MOSAIC PRINT HEAD
DE3133083A1 (en) &#34;BALLISTIC WIRE MATRIX PRINT HEAD&#34;
DE2536217A1 (en) BALLISTIC WIRE MATRIX IMPACT PUSH BUTTON
DE3419912C2 (en)
DE2330883A1 (en) MOSAIC PRINT HEAD
DE2652339C2 (en) Electrodynamic actuator for a printer
EP0371183B1 (en) Wire matrix print head of the clapper type
DE3785168T2 (en) Printhead with a one-piece anchor.
DE68921324T2 (en) Device for moving a transducer.
DE1245627B (en) Print hammer device
DE3018516A1 (en) PRINT HEAD
EP0217969A1 (en) Plunger-type core for frequencies up to 3,000 Hz and more
EP0188671B1 (en) Armature construction group manufacturing process for matrix print heads
EP0157727B1 (en) Matrix print head
EP0338176B1 (en) Wire matrix print head
EP0371182B1 (en) Wire matrix printhead of the clapper type
DE3243475A1 (en) NEEDLE PRINT HEAD FOR MATRIX PRINTER
DE3141816C2 (en)
EP0188669B1 (en) Matrix printing head
DE3040399C2 (en) Drive module for a multi-module print head of a dot matrix printer
DE4112105A1 (en) FLEXIBLE PANEL ARRANGEMENT
EP0040883A2 (en) Matrix printer with magnetic print-head adjustment
EP0188672B1 (en) Matrix printing head
DE2115956A1 (en) Printhead
DE68927390T2 (en) Dot matrix printer with stop print head

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: 19900523

17Q First examination report despatched

Effective date: 19911204

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 PRE;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.SCRIBED TIME-LIMIT

Effective date: 19940518

Ref country code: NL

Effective date: 19940518

Ref country code: FR

Effective date: 19940518

Ref country code: BE

Effective date: 19940518

Ref country code: GB

Effective date: 19940518

REF Corresponds to:

Ref document number: 105782

Country of ref document: AT

Date of ref document: 19940615

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3889662

Country of ref document: DE

Date of ref document: 19940623

EN Fr: translation not filed
NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

Effective date: 19940518

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

Ref country code: AT

Effective date: 19941201

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

Ref country code: CH

Effective date: 19941231

Ref country code: LI

Effective date: 19941231

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

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: DE

Payment date: 20000706

Year of fee payment: 12

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: 20011002