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EP0280864A2 - Needle print head - Google Patents

Needle print head Download PDF

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Publication number
EP0280864A2
EP0280864A2 EP19880100870 EP88100870A EP0280864A2 EP 0280864 A2 EP0280864 A2 EP 0280864A2 EP 19880100870 EP19880100870 EP 19880100870 EP 88100870 A EP88100870 A EP 88100870A EP 0280864 A2 EP0280864 A2 EP 0280864A2
Authority
EP
European Patent Office
Prior art keywords
needle
hinged
yoke
armature
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.)
Granted
Application number
EP19880100870
Other languages
German (de)
French (fr)
Other versions
EP0280864B1 (en
EP0280864A3 (en
Inventor
Herbert Beck
Karl-Heinz Anton
Harald Homner
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.)
Wincor Nixdorf International GmbH
Original Assignee
Wincor Nixdorf International GmbH
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 Wincor Nixdorf International GmbH filed Critical Wincor Nixdorf International GmbH
Priority to AT88100870T priority Critical patent/ATE66184T1/en
Publication of EP0280864A2 publication Critical patent/EP0280864A2/en
Publication of EP0280864A3 publication Critical patent/EP0280864A3/en
Application granted granted Critical
Publication of EP0280864B1 publication Critical patent/EP0280864B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 needle print head comprising a plurality of ring-shaped armature magnets arranged in a ring around a needle guide, each with a U-shaped magnet yoke, a magnet coil surrounding a U-leg and an at least approximately radially directed armature armature, which is firmly connected at its radially inner end to a pressure needle and is biased by spring force into its rest position, which is defined by a stop.
  • the hinged armature is suspended at its radially outer end on a spring clip and rests on the radially outer yoke leg in such a way that it can be tilted about the radially outer edge of the yoke leg surface facing it is.
  • a first disadvantage of this solution lies in the fact that the yoke leg and the hinged armature resting against it rub against one another during the movement of the latter, as a result of which a relatively strong and undefined wear of the abutting surfaces occurs. As a result, the quality of the print image of such a needle printhead changes after a long period of operation.
  • the folding anchor is mounted on the one yoke leg about a fixed pivot axis, a return spring acting on its short lever arm remote from the printing needle. Because of this unfavorable leverage ratio, the hinged anchor also has the disadvantages discussed above. Furthermore, in this embodiment, the hinged anchor is not firmly connected to the pressure needle, but strikes the pressure needle biased into its rest position by its own return spring. Since the pressure needle on the one hand and the hinged armature on the other hand represent two oscillating systems that do not have identical oscillation sizes, the oscillation behavior of the two oscillation systems can be significantly different at suitable operating frequencies. On the one hand, this can lead to increased wear on the pressure needle and the hinged anchor, and on the other hand, it can produce silhouettes.
  • the invention has for its object to provide a dot-matrix print head of the type mentioned, which is easy to manufacture and assemble, has a long service life, enables a high operating frequency and also ensures a clean typeface in all layers of the same without copies without the generation of silhouettes .
  • the hinged armature is pivotally mounted at its radially outer end by means of a cylindrical pin about its axis and that a return spring engages at a location of the hinged armature located between the pressure needle and the radially inner yoke leg.
  • the folding anchor has a spatially fixed, defined pivot axis.
  • the cylindrical pins can be made with simple means manufacture very precisely.
  • the abutting bearing surfaces of the pin on the one hand and the plastic bearing parts receiving it on the other hand are subject to low wear and tear, which is also carried out at least approximately in the same size and in the same way for all hinged anchors.
  • the elasticity of the plastic allows the pin to be clipped in. This means that the hinged anchor can be quickly installed without careful adjustment. At the same time, the plastic ensures little wear on the bearing pin.
  • the storage forks can be easily and precisely manufactured as injection molded parts.
  • a return spring preferably engages at a point of the hinged armature located between the pressure needle and the radially inner yoke leg. Since, in the solution according to the invention, the hinged armature is designed as a one-armed lever and the return spring acts on the hinged armature relatively far from the bearing axis, tolerances in the spring strength or in the distance of the point of application of the spring on the hinged armature from the bearing axis affect the impact force of the pressure needle hardly out. Therefore, the impact force of various new hinged anchors in the solution according to the invention is within a very narrow tolerance range.
  • the needle print head according to the invention thus provides a very uniform typeface. Because of the arrangement of the return spring relatively close to the pressure needle, the rebound of the hinged armature against the stop is also reduced, so that the danger of creating silhouettes at high operating frequencies is avoided.
  • the mounting of the bearing forks on the magnetic yoke can be done in a simple manner in that the bearing forks are connected to one another by a metal web which is attached to the radially outer yoke leg, for example by spot welding.
  • the return spring is preferably formed by a helical compression spring, which is supported on the one hand on a plate carrying the magnetic yokes and on the other hand on the respective hinged anchor, the helical compression spring advantageously being guided in a tube and for reducing the friction between the spring and the hinged anchor on the hinged anchor facing end carries a ball which engages in a spherical recess in the hinged anchor.
  • the stop common to all hinged anchors is adjustable in the direction of movement of the pressure needles.
  • the stop can wear a layer of a suitable damping material on its side facing the hinged anchors.
  • the mounting of the folding anchor according to the invention has the advantage over mounting the folding anchor on a spring that a defined air gap between the folding anchor and the magnetic yoke can be precisely maintained. This can reliably prevent the hinged anchor from sticking to the magnetic yoke.
  • FIG. 1 comprises a circular disk-shaped yoke plate, generally designated 10, with a central recess 12 into which a tubular central extension 14 of a disk-shaped heat sink 16 engages, on which the yoke plate 10 is fastened and which is attached to the yoke plate 10 opposite side fins 18 carries.
  • a schematically indicated mouthpiece or guide piece 17 for guiding printing needles 19 is held in the attachment 14.
  • the yoke plate 10 On its side facing away from the heat sink 16, the yoke plate 10 carries a plurality of folding armature magnets 20 in a circular arrangement around the central recess 12
  • the radially inner yoke leg 22 each carries a magnet coil 26.
  • the magnetic circuit is closed by an essentially radially directed hinged armature 28, to the inner end of which the pressure needle 19 is fastened.
  • the hinged armature 28 carries a cylindrical pin 30 which is mounted in a bearing part, generally designated 32, which is fastened to the radially outer yoke leg 24 and is explained in more detail with reference to FIGS. 2 and 3.
  • the hinged anchor 28 can thus be pivoted about the axis of the cylindrical pin 30 between the pressure position near the yoke leg shown in FIG. 1 and a position remote from the yoke leg, into which it is fastened by means of a screw compression spring 34 is tensioned and in which it rests on an annular stop 36.
  • the helical compression spring 34 is supported at one end on a pin 38 formed in one piece with the yoke plate. At its end facing the hinged anchor 28, the helical compression spring 34 carries a ball 40 which engages in a hemispherical recess 42 on the underside of the hinged anchor 28 so as to reduce the friction between the spring 34 and the hinged anchor 28.
  • the stop 36 carries on its side facing the hinged anchors 28 a ring 44 made of a material which dampens the impact of the hinged anchors, in order to prevent the hinged anchors 28 from rebounding from the stop 36.
  • the annular disk-shaped stop 36 can be fastened to the yoke plate 10 with the aid of screws 46 which engage in threaded bores 48 which are provided in extensions 50 formed in one piece with the yoke plate 10. With the aid of the spacer sleeves 52 surrounding the screws 46, the distance of the stop 36 from the yoke plate 10 and thus the pivoting path of the hinged armature 28 can be set precisely.
  • the bearing part 32 has two storage forks 54 made of plastic, which are connected to one another by a metal web 56 in such a way that they are at a distance from one another which corresponds approximately to the width of the yoke leg 24.
  • the metal web 56 is fastened, for example, by spot welding to the radially outward-facing surface of the yoke leg 24, so that the two bearing forks 54 lie on both sides of the yoke leg 24, as can be seen in FIG. 2.
  • the bearing forks 54 point radially outwards with their fork opening and close a part zylin between them dharilin between them dharilin between them dharilin between them dharilin between them dharilin between them dharilin between them dharilin between them dharilin between them dharilin between them dharilin between them dharilin between them dharilin between them dharidets 54, which extends slightly over 180 °.
  • the opening width of the fork openings is slightly smaller than the diameter of the cylindrical pin 30 fitting into the bearing surfaces 58.
  • a printhead with hinged armature magnets designed in this way achieves a long service life with a high-quality print image, does not provide any shadow images even at high working frequencies, and is also suitable for printing on copy sets due to the high achievable impact force of the print needles.

Landscapes

  • Impact Printers (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Sheet Holders (AREA)
  • Paper (AREA)

Abstract

In a needle print head including a plurality of hinged armature magnets arranged in a ring about a needle guide with each of the magnets including a U-shaped magnet yoke, a magnet coil on one of the U-legs of such yoke and a hinged armature arranged at least nearly radially, the hinged armature at its radially inner end is connected to a print needle and is biased by spring force to a rest position away from the yoke at which it engages a stop, each hinged armature at its radially outer end being pivotally supported by a cylindrical pin for rotation about the axis of the pin, and a return spring engaging the hinged armature at a point between the print needle and the radially inner yoke leg.

Description

Die Erfindung betrifft einen Nadeldruckkopf umfassend eine Mehrzahl von ringförmig um eine Nadelführung angeordneten Klappankermagneten mit jeweils einem U-förmigen Magnetjoch, einer einen U-Schenkel umgebenden Magnetspule und einem mindestens annähernd radial gerichteten Klappanker, der an seinem radial inneren Ende mit einer Drucknadel fest verbunden ist und durch Federkraft in seine durch einen Anschlag festgelegte jochferne Ruhestellung vorgespannt ist.The invention relates to a needle print head comprising a plurality of ring-shaped armature magnets arranged in a ring around a needle guide, each with a U-shaped magnet yoke, a magnet coil surrounding a U-leg and an at least approximately radially directed armature armature, which is firmly connected at its radially inner end to a pressure needle and is biased by spring force into its rest position, which is defined by a stop.

Bei einem aus der DE-OS 27 17 077 bekannten Nadeldruckkopf der vorstehend genannten Art ist der Klappanker an seinem radial äußeren Ende an einem Federbügel eingehängt und liegt auf dem radial äußeren Jochschenkel derart auf, daß er um die radial äußere Kante der ihm zugewandten Jochschenkel­fläche kippbar ist. Ein erster Nachteil dieser Lösung liegt darin, daß der Jochschenkel und der an ihm anliegende Klapp­anker bei der Bewegung des letzteren aneinander reiben, wodurch eine relativ starke und nicht definierte Abnutzung der aneinander anliegenden Flächen auftritt. Dadurch ändert sich die Qualität des Druckbildes eines solchen Nadeldruck­kopfes nach längerer Betriebszeit. Gemäß der DE-OS 29 43 440 hat man bereits versucht, diesen Nachteil dadurch zu be­seitigen, daß der Klappanker nicht um eine Kante des Magnet­joches kippt, sondern sich auf einem zylindrischen Stift abwälzt. In der Praxis findet jedoch auch hier keine reine Abwälzbewegung statt, da der Federbügel, an dem der Klapp­anker eingehängt ist, stets auch eine leichte translatorische Bewegung des Klappankers bewirkt. Bei beiden bekannten Klappankermagneten sind die Klappanker zudem als zweiarmige Hebel ausgebildet mit einem Hebelverhältnis von ca. 1:20. Dieses große Hebelverhältnis bedeutet, daß nicht nur die Kräfte, sondern auch die mechanischen Toleranzen im Bereich der beiden Hebelarme bzw. an den beiden Enden der Hebelarme in einem derartigen Verhältnis zueinander stehen. Ein Ab­rieb von einigen Hunderstel Millimetern im Bereich der Ankerlagerung bewirkt eine erheblich größere Ortsverän­derung an dem die Drucknadel tragendenden Ankerende. Daraus ergibt sich, daß selbst bei neuen Klappankermagneten erheb­liche Schwankungen in der Aufschlagkraft auftreten, mit der die Drucknadel auf einen Aufzeichnungsträger einwirkt.In a needle print head known from DE-OS 27 17 077 of the aforementioned type, the hinged armature is suspended at its radially outer end on a spring clip and rests on the radially outer yoke leg in such a way that it can be tilted about the radially outer edge of the yoke leg surface facing it is. A first disadvantage of this solution lies in the fact that the yoke leg and the hinged armature resting against it rub against one another during the movement of the latter, as a result of which a relatively strong and undefined wear of the abutting surfaces occurs. As a result, the quality of the print image of such a needle printhead changes after a long period of operation. According to DE-OS 29 43 440, attempts have already been made to overcome this disadvantage in that the hinged armature does not tip over an edge of the magnetic yoke, but rather rolls on a cylindrical pin. In practice, however, there is no pure rolling motion here either, since the spring clip on which the hinged anchor is attached always also causes a slight translatory movement of the hinged anchor. In both known Folding anchor magnets are also designed as two-armed levers with a lever ratio of approx. 1:20. This large lever ratio means that not only the forces, but also the mechanical tolerances in the region of the two lever arms or at the two ends of the lever arms are in such a relationship to one another. An abrasion of a few hundredths of a millimeter in the area of the anchor bearing causes a considerably greater change in location at the anchor end carrying the pressure needle. The result of this is that even with new hinged armature magnets, considerable fluctuations occur in the impact force with which the printing needle acts on a recording medium.

Aus der US-PS 4,202,638 ist ferner ein Klappankermagnet für einen Drucker bekannt, bei dem der Klappanker mit seinem dem Druckende abgewandten Ende an einer Blattfeder befestigt ist. Der Klappanker liegt dabei in seiner Ruhestellung an dem Magnetjoch an, wobei die Blattfeder gespannt wird, so daß der KIappanker unter der Wirkung der Blattfeder auf dem Aufzeichnungsträger aufschlägt. Bei dieser Lösung kann zwar kein Verschleiß im Lagerbereich des Klappankers auftreten, jedoch ist die Lagerachse des Klappankers nicht wohldefi­niert. Zudem reichen die durch die Feder erzeugbaren Auf­schlagkräfte nicht aus, um bei mehrlagigen Durchschreibe­sätzen auch auf dem letzten Blatt noch ein Schriftbild guter Qualität zu erzielen.From US Pat. No. 4,202,638 a folding armature magnet for a printer is also known, in which the folding armature is fastened to a leaf spring with its end facing away from the printing end. The hinged anchor rests in its rest position on the magnetic yoke, the leaf spring being tensioned so that the KIappanker strikes the record carrier under the action of the leaf spring. With this solution, no wear can occur in the bearing area of the hinged anchor, but the bearing axis of the hinged anchor is not well-defined. In addition, the impact forces that can be generated by the spring are not sufficient to achieve a good-quality typeface on the last page of multiple-layer copy sets.

Bei einem aus der GB-A 20 35 905 bekannten Klappanker für einen Nadeldruckkopf ist der Klappanker an dem einen Joch­schenkel um eine feste Schwenkachse gelagert, wobei an seinem der Drucknadel fernen kurzen Hebelarm eine Rückstell­feder angreift. Aufgrund dieses ungünstigen Hebelverhält­nisses hat der Klappanker ebenfalls die oben erörterten Nachteile. Ferner ist bei dieser Ausführungsform der Klappanker nicht mit der Drucknadel fest verbunden, sondern schlägt auf die durch eine eigene Rückstellfeder in ihre Ruhestellung vorgespannte Drucknadel. Da die Drucknadel einerseits und der Klappanker andererseits zwei schwingende Systeme darstellen, die keine identischen Schwingungsgrößen besitzen, kann es bei geeigneten Betriebs­frequenzen zu einem deutlich unterschiedlichen Schwingungs­verhalten der beiden Schwingungssysteme kommen. Dies kann einerseits zu einem erhöhten Verschleiß an der Drucknadel und dem Klappanker und andererseits zur Erzeugung von Schattenbildern führen.In a folding anchor for a needle printhead known from GB-A 20 35 905, the folding anchor is mounted on the one yoke leg about a fixed pivot axis, a return spring acting on its short lever arm remote from the printing needle. Because of this unfavorable leverage ratio, the hinged anchor also has the disadvantages discussed above. Furthermore, in this embodiment, the hinged anchor is not firmly connected to the pressure needle, but strikes the pressure needle biased into its rest position by its own return spring. Since the pressure needle on the one hand and the hinged armature on the other hand represent two oscillating systems that do not have identical oscillation sizes, the oscillation behavior of the two oscillation systems can be significantly different at suitable operating frequencies. On the one hand, this can lead to increased wear on the pressure needle and the hinged anchor, and on the other hand, it can produce silhouettes.

Der Erfindung liegt die Aufgabe zugrunde, einen Nadeldruck­kopf der eingangs genannten Art anzugeben, der einfach her­zustellen und zu montieren ist, eine lange Standzeit be­sitzt, eine hohe Betriebsfrequenz ermöglicht und auch noch bei Durchschreibsätzen ein sauberes Schriftbild auf allen Lagen desselben ohne die Erzeugung von Schattenbildern ge­währleistet.The invention has for its object to provide a dot-matrix print head of the type mentioned, which is easy to manufacture and assemble, has a long service life, enables a high operating frequency and also ensures a clean typeface in all layers of the same without copies without the generation of silhouettes .

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Klappanker an seinem radial äußeren Ende mittels eines zylindrischen Stiftes um dessen Achse schwenkbar gelagert ist und daß eine Rückstellfeder an einer zwischen der Drucknadel und dem radial inneren Jochschenkel gelegenen Stelle des Klappankers angreift.This object is achieved in that the hinged armature is pivotally mounted at its radially outer end by means of a cylindrical pin about its axis and that a return spring engages at a location of the hinged armature located between the pressure needle and the radially inner yoke leg.

Bei dem erfindungsgemäßen Nadeldruckkopf hat der Klappan­ker eine räumlich festliegende definierte Schwenkachse. Die zylindrischen Stifte lassen sich mit einfachen Mitteln sehr präzise herstellen. Die aneinander anliegenden Lager­flächen des Stiftes einerseits und der ihn aufnehmenden aus Kunststoff bestehenden Lagerteile andererseits unter­liegen einem geringen Verschleiß, der zudem bei allen Klappankern zumindest annähernd in der gleichen Größe und gleichen Weise erfolgt. Die Elastizität des Kunst­stoffes ermöglicht das Einklipsen des Stiftes. Damit kann der Klappanker ohne eine sorgfältige Justage rasch mon­tiert werden. Gleichzeitig gewährleistet der Kunststoff einen geringen Verschleiß an dem Lagerstift. Zudem können die Lagergabeln auf einfache Weise und sehr präzise als Spritzgußteile gefertigt werden. Vorzugsweise greift eine Rückstellfeder an einer zwischen der Drucknadel und dem radial inneren Jochschenkel gelegenen Stelle des Klapp­ankers an. Da bei der erfindungsgemäßen Lösung der Klapp­anker als einarmiger Hebel ausgebildet ist und die Rück­stellfeder relativ weit von der Lagerachse entfernt an dem Klappanker angreift, wirken sich Toleranzen in der Federstärke oder in dem Abstand des Angriffspunktes der Feder am Klappanker von der Lagerachse auf die Aufschlag­kraft der Drucknadel kaum aus. Daher liegt bei der erfin­dungsgemäßen Lösung die Aufschlagkraft verschiedener neuer Klappanker in einem sehr engen Toleranzbereich. Damit liefert der erfindungsgemäße Nadeldruckkopf ein sehr gleich­förmiges Schriftbild. Wegen der Anordnung der Rückstell­feder relativ nah an der Drucknadel wird auch der Rückprall des Klappankers an dem Anschlag vermindert, so daß die Gefahr der Erzeugung von Schattenbildern bei hohen Betriebs­frequenzen vermieden wird.In the needle print head according to the invention, the folding anchor has a spatially fixed, defined pivot axis. The cylindrical pins can be made with simple means manufacture very precisely. The abutting bearing surfaces of the pin on the one hand and the plastic bearing parts receiving it on the other hand are subject to low wear and tear, which is also carried out at least approximately in the same size and in the same way for all hinged anchors. The elasticity of the plastic allows the pin to be clipped in. This means that the hinged anchor can be quickly installed without careful adjustment. At the same time, the plastic ensures little wear on the bearing pin. In addition, the storage forks can be easily and precisely manufactured as injection molded parts. A return spring preferably engages at a point of the hinged armature located between the pressure needle and the radially inner yoke leg. Since, in the solution according to the invention, the hinged armature is designed as a one-armed lever and the return spring acts on the hinged armature relatively far from the bearing axis, tolerances in the spring strength or in the distance of the point of application of the spring on the hinged armature from the bearing axis affect the impact force of the pressure needle hardly out. Therefore, the impact force of various new hinged anchors in the solution according to the invention is within a very narrow tolerance range. The needle print head according to the invention thus provides a very uniform typeface. Because of the arrangement of the return spring relatively close to the pressure needle, the rebound of the hinged armature against the stop is also reduced, so that the danger of creating silhouettes at high operating frequencies is avoided.

Die Befestigung der Lagergabeln an dem Magnetjoch kann auf einfache Weise dadurch erfolgen, daß die Lagergabeln durch einen Metallsteg miteinander verbunden sind, der an dem radial äußeren Jochschenkel beispielsweise durch Punktschweißen befestigt ist.The mounting of the bearing forks on the magnetic yoke can be done in a simple manner in that the bearing forks are connected to one another by a metal web which is attached to the radially outer yoke leg, for example by spot welding.

Die Rückstellfeder ist vorzugsweise von einer Schrauben­druckfeder gebildet, die sich einerseits an einer die Magnetjoche tragende Platte und andererseits an dem je­weiligen Klappanker abstützt, wobei die Schraubendruckfeder zweckmäßigerweise in einem Rohr geführt ist und zur Ver­minderung der Reibung zwischen der Feder und dem Klapp­anker an ihrem dem Klappanker zugewandten Ende eine Kugel trägt, die in eine kugelflächenförmige Vertiefung im Klapp­anker eingreift.The return spring is preferably formed by a helical compression spring, which is supported on the one hand on a plate carrying the magnetic yokes and on the other hand on the respective hinged anchor, the helical compression spring advantageously being guided in a tube and for reducing the friction between the spring and the hinged anchor on the hinged anchor facing end carries a ball which engages in a spherical recess in the hinged anchor.

Um den Weg des Klappankers einstellen zu können, ist es zweckmäßig, wenn der allen Klappankern gemeinsame Anschlag in Bewegungsrichtung der Drucknadeln verstellbar ist. Zur Dämpfung des Rückpralls kann der Anschlag dabei auf seiner den Klappankern zugewandten Seite eine Schicht aus einem geeigneten Dämpfungsmaterial tragen.In order to be able to adjust the path of the hinged anchor, it is expedient if the stop common to all hinged anchors is adjustable in the direction of movement of the pressure needles. To dampen the rebound, the stop can wear a layer of a suitable damping material on its side facing the hinged anchors.

Neben den bereits aufgeführten Vorteilen hat die erfindungs­gemäße Lagerung des Klappankers gegenüber einer Lagerung des Klappanker an einer Feder noch den Vorzug, daß sich ein definierter Luftspalt zwischen Klappanker und Magnet­joch präzise einhalten läßt. Damit kann ein Kleben des Klappankers am Magnetjoch zuverlässig verhindert werden.In addition to the advantages already mentioned, the mounting of the folding anchor according to the invention has the advantage over mounting the folding anchor on a spring that a defined air gap between the folding anchor and the magnetic yoke can be precisely maintained. This can reliably prevent the hinged anchor from sticking to the magnetic yoke.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der folgenden Beschreibung, welche in Verbindung mit den beigefügten Zeichnungen die Erfindung anhand eines Ausführungsbeispieles erläutert. Es zeigen:

  • Fig. 1 einen schematischen Schnitt durch einen erfin­dungsgemäßen Druckkopf mit parallel zu den Drucknadeln verlaufender Schnittebene, die auf der rechten Hälfte der Fig. 1 durch einen Klapp­ankermagneten und in der linken Hälfte der Fig. 1 zwischen zwei benachbarten Klappankermagneten verläuft,
  • Fig. 2 eine schematische Ansicht eines Klappankermagneten in Richtung des Pfeiles A in Fig. 1 und
  • Fig. 3 eine vergrößerte perspektivische Darstellung des zur Aufnahme des Zylinderstiftes am Klappanker be­stimmten Lagerteiles.
Further features and advantages of the invention will become apparent from the following description, which in connection with the accompanying drawings explains the invention using an exemplary embodiment. Show it:
  • 1 shows a schematic section through a printhead according to the invention with a cutting plane running parallel to the printing needles, which runs on the right half of FIG. 1 through a folding armature magnet and in the left half of FIG. 1 between two adjacent folding armature magnets,
  • Fig. 2 is a schematic view of a folding armature magnet in the direction of arrow A in Fig. 1 and
  • Fig. 3 is an enlarged perspective view of the bearing part intended for receiving the cylindrical pin on the hinged anchor.

Der in der Fig. 1 schematisch dargestellte Nadeldruckkopf umfaßt eine allgemein mit 10 bezeichnete kreisscheiben­förmige Jochplatte mit einer zentralen Aussparung 12, in die ein rohrförmiger zentraler Ansatz 14 eines scheiben­förmigen Kühlkörpers 16 eingreift, auf dem die Jochplatte 10 befestigt ist und der an seiner der Jochplatte 10 abge­wandten Seite Kühlrippen 18 trägt. In dem Ansatz 14 ist ein schematisch angedeutetes Mund- oder Führungsstück 17 zur Führung von Drucknadeln 19 gehalten.1 comprises a circular disk-shaped yoke plate, generally designated 10, with a central recess 12 into which a tubular central extension 14 of a disk-shaped heat sink 16 engages, on which the yoke plate 10 is fastened and which is attached to the yoke plate 10 opposite side fins 18 carries. A schematically indicated mouthpiece or guide piece 17 for guiding printing needles 19 is held in the attachment 14.

Auf ihrer dem Kühlkörper 16 abgewandten Seite trägt die Jochplatte 10 in kreisförmiger Anordnung um die zentrale Aussparung 12 eine Vielzahl von Klappankermagneten 20. Je­der dieser Klappankermagnete umfaßt zwei in radialer Rich­tung nebeneinander angeordnete einstückig mit der Joch­platte 10 ausgebildete und senkrecht zu dieser gerichtete Jochschenkel 22, 24. Der radial innere Jochschenkel 22 trägt jeweils eine Magnetspule 26. Der magnetische Kreis wird geschlossen durch einen im wesentlichen radial ge­richteten Klappanker 28, an dessen innerem Ende die Druck­nadel 19 befestigt ist. An seinem radial äußeren Ende trägt der Klappanker 28 einen zylindrischen Stift 30, der in einem an dem radial äußeren Jochschenkel 24 befestigten allgemein mit 32 bezeichneten Lagerteil gelagert ist, das anhand der Figuren 2 und 3 noch näher erläutert ist. Da­mit ist der Klappanker 28 um die Achse des zylindrischen Stiftes 30 zwischen der in der Fig. 1 dargestellten joch­schenkelnahen Druckstellung und einer jochschenkelfernen Stellung verschwenkbar, in die er durch eine Schrauben­ druckfeder 34 gespannt wird und in der er an einem ring­förmigen Anschlag 36 anliegt.On its side facing away from the heat sink 16, the yoke plate 10 carries a plurality of folding armature magnets 20 in a circular arrangement around the central recess 12 The radially inner yoke leg 22 each carries a magnet coil 26. The magnetic circuit is closed by an essentially radially directed hinged armature 28, to the inner end of which the pressure needle 19 is fastened. At its radially outer end, the hinged armature 28 carries a cylindrical pin 30 which is mounted in a bearing part, generally designated 32, which is fastened to the radially outer yoke leg 24 and is explained in more detail with reference to FIGS. 2 and 3. The hinged anchor 28 can thus be pivoted about the axis of the cylindrical pin 30 between the pressure position near the yoke leg shown in FIG. 1 and a position remote from the yoke leg, into which it is fastened by means of a screw compression spring 34 is tensioned and in which it rests on an annular stop 36.

Die Schraubendruckfeder 34 stützt sich mit ihrem einen Ende auf einem einstückig mit der Jochplatte ausgebildeten Zapfen 38 ab. An ihrem dem Klappanker 28 zugewandten Ende trägt die Schraubendruckfeder 34 eine Kugel 40, die in eine halbkugelförmige Vertiefung 42 an der Unterseite des Klappankers 28 eingreift um so die Reibung zwischen der Feder 34 und dem Klappanker 28 zu vermindern.The helical compression spring 34 is supported at one end on a pin 38 formed in one piece with the yoke plate. At its end facing the hinged anchor 28, the helical compression spring 34 carries a ball 40 which engages in a hemispherical recess 42 on the underside of the hinged anchor 28 so as to reduce the friction between the spring 34 and the hinged anchor 28.

Der Anschlag 36 trägt auf seiner den Klappankern 28 zu­gewandten Seite einen Ring 44 aus einem den Aufschlag der Klappanker dämpfenden Material, um so den Rückprall der Klappanker 28 von dem Anschlag 36 zu verhindern. Der ringscheibenförmige Anschlag 36 ist an der Jochplatte 10 mit Hilfe von Schrauben 46 befestigbar, die in Gewinde­bohrungen 48 eingreifen, die in einstückig mit der Joch­platte 10 ausgebildeten Fortsätzen 50 vorgesehen sind. Mit Hilfe von die Schrauben 46 umgebenden Distanzhülsen 52 kann der Abstand des Anschlags 36 von der Jochplatte 10 und damit der Schwenkweg der Klappanker 28 genau ein­gestellt werden.The stop 36 carries on its side facing the hinged anchors 28 a ring 44 made of a material which dampens the impact of the hinged anchors, in order to prevent the hinged anchors 28 from rebounding from the stop 36. The annular disk-shaped stop 36 can be fastened to the yoke plate 10 with the aid of screws 46 which engage in threaded bores 48 which are provided in extensions 50 formed in one piece with the yoke plate 10. With the aid of the spacer sleeves 52 surrounding the screws 46, the distance of the stop 36 from the yoke plate 10 and thus the pivoting path of the hinged armature 28 can be set precisely.

Das Lagerteil 32 weist gemäß den Figuren 2 und 3 zwei aus Kunststoff gefertigte Lagergabeln 54 auf, die durch einen Metallsteg 56 derart miteinander verbunden sind, daß sie einen etwa der Breite des Jochschenkels 24 ent­sprechenden Abstand voneinander aufweisen. Der Metall­steg 56 wird beispielsweise durch Punktschweißen an der radial nach außen weisenden Fläche des Jochschenkels 24 befestigt, so daß die beiden Lagergabeln 54 zu beiden Seiten des Jochschenkels 24 liegen, wie man dies in Fig. 2 erkennen kann.According to FIGS. 2 and 3, the bearing part 32 has two storage forks 54 made of plastic, which are connected to one another by a metal web 56 in such a way that they are at a distance from one another which corresponds approximately to the width of the yoke leg 24. The metal web 56 is fastened, for example, by spot welding to the radially outward-facing surface of the yoke leg 24, so that the two bearing forks 54 lie on both sides of the yoke leg 24, as can be seen in FIG. 2.

Die Lagergabeln 54 weisen mit ihrer Gabelöffnung radial nach außen und schließen zwischen sich eine teilzylin­ drische Lagerfläche 58 ein, die sich geringfügig über 180° erstreckt. Dadurch ist die Öffnungsweite der Gabel­öffnungen geringfügig kleiner als der Durchmesser des in die Lagerflächen 58 passenden zylindrischen Stiftes 30. Beim Eindrücken des zylindrischen Stiftes 30 in die Lager­gabeln 54 werden deren freie Gabelschenkel 60 daher ge­ringfügig elastisch ausgelenkt und halten nach dem Ein­schnappen des zylindrischen Stiftes 30 in die Lagerfläche 58 den Stift 30 fest, sodaß er nicht selbstätig aus den Lagergabeln 54 herausrutschen kann.The bearing forks 54 point radially outwards with their fork opening and close a part zylin between them drische bearing surface 58, which extends slightly over 180 °. As a result, the opening width of the fork openings is slightly smaller than the diameter of the cylindrical pin 30 fitting into the bearing surfaces 58. When the cylindrical pin 30 is pressed into the bearing forks 54, the free fork legs 60 thereof are therefore deflected slightly elastically and hold in after the cylindrical pin 30 snaps into place the bearing surface 58 fixed the pin 30 so that it cannot slide out of the bearing forks 54 automatically.

Es hat sich gezeigt, daß ein Druckkopf mit derart ausge­bildeten Klappankermagneten eine lange Standzeit bei qualitativ hochwertigem Druckbild erreicht, auch bei hohen Arbeitsfrequenzen keine Schattenbilder liefert und auch aufgrund der hohen erzielbaren Aufschlagkraft der Drucknadeln zum Bedrucken von Durchschreibesätzen geeignet ist.It has been shown that a printhead with hinged armature magnets designed in this way achieves a long service life with a high-quality print image, does not provide any shadow images even at high working frequencies, and is also suitable for printing on copy sets due to the high achievable impact force of the print needles.

Claims (7)

1. Nadeldruckkopf umfassend eine Mehrzahl von ringförmig um eine Nadelführung angeordneten Klappankermagneten mit jeweils einem U-förmigen Magnetjoch, einer einen U-Schenkel umgebenden Magnetspule und einem mindestens annähernd radial gerichteten Klappanker, der an seinem radial inneren Ende mit einer Drucknadel fest verbun­den ist und durch Federkraft in seine durch einen An­schlag festgelegte jochferne Ruhestellung vorgespannt ist, dadurch gekennzeichnet, daß der Klappanker (28) an seinem radial äußeren Ende mittels eines zylindrischen Stiftes (30) um dessen Achse schwenkbar gelagert ist und daß der zylindrische Stift (30) in beiderseits des radial äußeren Jochschenkels (24) angeordneten Lagergabeln (54) einklipsbar ist, die aus Kunststoff bestehen, und deren Gabelschenkel jeweils eine sich über mehr als 180° erstreckende teilzylindrische Lagerfläche (58) zwischen sich ein­schließen.1. Needle print head comprising a plurality of annularly arranged folding armature magnets, each with a U-shaped magnet yoke, a magnetic coil surrounding a U-leg and an at least approximately radially directed folding armature, which is firmly connected at its radially inner end to a printing needle and through Spring force is biased into its yoke-distant rest position defined by a stop, characterized in that the hinged armature (28) is pivotally mounted at its radially outer end by means of a cylindrical pin (30) about its axis and that the cylindrical pin (30) is on both sides of the radially outer yoke leg (24) arranged bearing forks (54) can be clipped, which consist of plastic, and the fork legs each enclose a partially cylindrical bearing surface (58) extending over more than 180 ° between them. 2. Nadeldruckkopf nach Anspruch 1, dadurch gekenn­zeichnet, daß die Lagergabeln (54) durch einen Metallsteg (56) miteinander verbunden sind, der an dem radial äußeren Jochschenkel (24) befestigt ist.2. Needle print head according to claim 1, characterized in that the bearing forks (54) are interconnected by a metal web (56) which is attached to the radially outer yoke leg (24). 3. Nadeldruckkopf nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß eine Rückstellfeder (34) an einer zwischen der Drucknadel (19) und dem radial inneren Jochschenkel (22) gelegenen Stelle des Klappankers (28) angreift.3. Needle printhead according to claim 1 or 2, characterized in that a return spring (34) engages at a point between the pressure needle (19) and the radially inner yoke leg (22) located on the hinged armature (28). 4. Nadeldruckkopf nach Anspruch 3, dadurch gekenn­zeichnet, daß die Rückstellfeder (34) von einer Schraubendruckfeder gebildet ist, die sich einerseits an einer die Jochschenkel (22, 24) tragenden Platte (10) und andererseits an dem jeweiligen Klappanker (28) abstützt.4. Needle printhead according to claim 3, characterized in that the return spring (34) is formed by a helical compression spring which is supported on the one hand on a yoke leg (22, 24) carrying plate (10) and on the other hand on the respective folding anchor (28). 5. Nadeldruckkopf nach Anspruch 4, dadurch gekenn­zeichnet, daß die Schraubendruckfeder (34) an ihrem dem Klappanker (28) zugewandten Ende eine Kugel (40) trägt, die in eine kugelflächenförmige Vertiefung (42) im Klappanker (28) eingreift.5. Needle print head according to claim 4, characterized in that the helical compression spring (34) at its end facing the hinged anchor (28) carries a ball (40) which engages in a spherical recess (42) in the hinged anchor (28). 6. Nadeldruckkopf nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der allen Klappankern (28) gemeinsame Anschlag (36) in Bewegungsrichtung der Drucknadeln (19) relativ zu den Klappankern (28) ver­stellbar ist.6. Needle printhead according to one of claims 1 to 5, characterized in that the all hinged armatures (28) common stop (36) in the direction of movement of the printing needles (19) is adjustable relative to the hinged armatures (28). 7. Nadeldruckkopf nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Anschlag (36) auf seiner den Klappankern (28) zugewandten Seite eine Schicht (44) aus einem den Rückprall der Klappanker (28) dämpfenden Material trägt.7. Needle print head according to one of claims 1 to 6, characterized in that the stop (36) on its side facing the folding anchors (28) carries a layer (44) made of a rebound of the folding anchors (28) damping material.
EP88100870A 1987-03-02 1988-01-21 Needle print head Expired - Lifetime EP0280864B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88100870T ATE66184T1 (en) 1987-03-02 1988-01-21 DOTSMAT PRINTHEAD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873706730 DE3706730A1 (en) 1987-03-02 1987-03-02 NEEDLE PRINT HEAD
DE3706730 1987-03-02

Publications (3)

Publication Number Publication Date
EP0280864A2 true EP0280864A2 (en) 1988-09-07
EP0280864A3 EP0280864A3 (en) 1989-01-04
EP0280864B1 EP0280864B1 (en) 1991-08-14

Family

ID=6322132

Family Applications (1)

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EP88100870A Expired - Lifetime EP0280864B1 (en) 1987-03-02 1988-01-21 Needle print head

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Country Link
US (1) US4838714A (en)
EP (1) EP0280864B1 (en)
JP (1) JPS63233849A (en)
AT (1) ATE66184T1 (en)
DE (2) DE3706730A1 (en)
ES (1) ES2024557B3 (en)

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US7314323B2 (en) * 2003-09-03 2008-01-01 Toshiba Tec Kabushiki Kaisha Wire dot printer head and wire dot printer
JP2005254663A (en) * 2004-03-12 2005-09-22 Toshiba Tec Corp Wire dot printer head and wire dot printer
JP4515121B2 (en) * 2004-03-15 2010-07-28 東芝テック株式会社 Wire dot printer head and wire dot printer
CN112943824A (en) * 2021-04-07 2021-06-11 浙江弗尔德驱动科技有限公司 Brake of integrated multi-point braking heavy-load elevator tractor

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Also Published As

Publication number Publication date
ATE66184T1 (en) 1991-08-15
DE3864161D1 (en) 1991-09-19
JPS63233849A (en) 1988-09-29
DE3706730A1 (en) 1988-09-15
EP0280864B1 (en) 1991-08-14
US4838714A (en) 1989-06-13
ES2024557B3 (en) 1992-03-01
DE3706730C2 (en) 1990-04-05
EP0280864A3 (en) 1989-01-04

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