EP0223148A1 - Matrix print head - Google Patents

Matrix print head Download PDF

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Publication number
EP0223148A1
EP0223148A1 EP86115255A EP86115255A EP0223148A1 EP 0223148 A1 EP0223148 A1 EP 0223148A1 EP 86115255 A EP86115255 A EP 86115255A EP 86115255 A EP86115255 A EP 86115255A EP 0223148 A1 EP0223148 A1 EP 0223148A1
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EP
European Patent Office
Prior art keywords
printing
armature
print head
needles
needle
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
EP86115255A
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German (de)
French (fr)
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EP0223148B1 (en
Inventor
Bernd Dipl.-Ing. Gugel (Fh)
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Vodafone GmbH
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Mannesmann AG
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Application filed by Mannesmann AG filed Critical Mannesmann AG
Priority to AT86115255T priority Critical patent/ATE44910T1/en
Publication of EP0223148A1 publication Critical patent/EP0223148A1/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
    • B41J2/27—Actuators for print wires
    • B41J2/275—Actuators for print wires of clapper type

Definitions

  • the invention relates to a matrix printhead with printing needles, which can be driven for printing point-by-point characters on a record carrier either by means of an electromagnetic coil associated with each printing needle with armature for printing, the printing needles being mounted and guided in a front housing and the armatures in a rear housing and the electromagnetic coils and the associated yoke body are combined to form a magnetic block on a base plate and the base plate is connected to the front housing, the armatures are each pivotably mounted between the front housing and one of the legs of the magnetic yoke and with their radially inner part on the one hand with the pressure needle are in frictional engagement during the pressure movement and, on the other hand, bear in the pivoted-back position against an annular disk-shaped, axially acting, resilient stop which is itself axially fixed to a core bushing.
  • the ribbon is moved transversely to the print medium so that at least two relative movement components occur between the printing needles and the ribbon.
  • so-called ribbon tears occur because the needles tear into the ribbon.
  • a rebound of the armature or an unwanted rebound of the printing needles is also not excluded.
  • the elastic materials of the flat rings continue to cause difficulties with regard to the individual pressure needles. It has been found that the printing needles perform different strokes, which is reflected in a deteriorated print image. Such rebound matrix printheads also have a very much shorter service life.
  • the invention has for its object to improve the flat rings in such a way that no rebound phenomena of the pressure needles or the armature occur in order to avoid the difficulties outlined.
  • the stated object is achieved according to the invention in the design of the matrix printhead that the ring-shaped stop consists of vibrations of the armature-absorbing material with a hardness between 60 Shore A to 90 Shore A and is fixed to the core bushing by means of adhesives which are temperature-resistant to a minimum of 100 degrees C. connected is.
  • Such a connection of the stop to the core socket has been found in difficult and lengthy tests.
  • the strokes of the pressure needles were largely the same, and the rebound phenomena were reduced considerably.
  • the service life of such matrix print heads could be increased significantly.
  • the greatest possible damping is e.g. achieved in that the washer-shaped stop is made of fluorine rubber.
  • the adhesive which is resistant to temperatures of up to 100 degrees C, consists of a two-component adhesive with an epoxy resin as a binder and a modified amide as a hardener.
  • the rebound behavior and the durability of the connection is also positively influenced by the fact that the core bushing is made of aluminum or an aluminum alloy.
  • the matrix print head In the writing position, the matrix print head is opposite a print abutment 1 or a recording medium 1a and an ink ribbon 1b.
  • the platen 1 is designed as a round cylindrical platen.
  • the matrix print head is divided into a print needle drive assembly 2 and a print needle adjustment assembly 3.
  • the printing needle adjustment assembly 3 is used for the vertical height adjustment of a plurality of printing needles 4 arranged one above the other, a so-called needle gap, in order to write fine writing or fast writing (near letter quality / draft).
  • the pressure needle adjusting assembly 3 is therefore only described in its essential components.
  • the push pin adjustment assembly 3 includes a front housing 5 with an ink ribbon mask 6, in the inner cutout of which a vertically up and down adjustable guide mouthpiece 7 is provided, which is attached to a lever 8.
  • the lever 8 is mounted on the front housing 5 by means of a leaf spring 9 and a screw 10, the leaf spring 9 forming a play-free joint.
  • the lever 8 is adjusted by means of an electromagnet 11, the lever 8 being pulled in a controlled manner against the core of the electromagnet 11 (not shown in more detail) or being moved away from it.
  • the adjustment of the lever 8 thus brings about an adjustment of the guide mouthpiece 7 with all the printing needles 4 in the vertical direction.
  • the pressure needle adjustment assembly 3 is described in more detail in German Offenlegungsschrift 34 12 856.
  • the printing needles 4 are moved in the direction of their longitudinal extension, i.e. in the printing direction.
  • yoke bodies 14 for each individual printing needle 4 are fastened on an end plate 12 in a base plate 13.
  • the outer legs 14a each carry an electromagnetic coil 14b.
  • the yoke body 14, the base plate 13, the electromagnetic coils 14b form a magnetic block 15.
  • a core bushing 16 is provided in the base plate 13.
  • a centering bushing 19 (FIG. 2) extends into the core bushing 16.
  • a screw 20 rests with its head 21 on a ring shoulder 16a of the core bushing 16 and pulls the centering sleeve 19 with its ring shoulder 19a against the ring shoulder 16a, whereby the rear housing 17 is connected to the magnetic block 15 into one unit.
  • a spring washer 22 is inserted under an outer ring shoulder 16b of the core bushing 16, which causes the core bushing 16 to work against the force of the screw 20.
  • a plastic ring 23 forms a pivot bearing 24 for an armature 25, which with its front end 25a in the retracted position of the pressure needle 4 fits snugly against an annular disk-shaped stop 26.
  • the annular disk-shaped stop 26 (for example made of fluorine rubber) is glued onto the end face of the core bushing 16 by means of a temperature-resistant adhesive 27.
  • the printing needles 4 rest with their needle head 4a against the front ends 25a of the armatures 25.
  • the needle heads 4a are pressed against the stop 25 by means of helical springs 28, which are supported against an abutment 29 which is arranged concentrically with needle bores 17a in the rear housing 17.
  • the position of the needle head 4a with respect to the armature 25 is determined by the distance "1".
  • the pivot bearing 24 there are dimensions "a” for the distance from the rear end 25b of the armature 25 to the central axis 30, "b” from the pivot bearing 24 to the center of the needle head 4a when it bears against the front end 25a of the armature 25, "c” from the pivot bearing 24 to the rear end 25b of the armature 25.
  • the dimensions a, b, c determine the energy and force ratios when the Anchor with more than 800 pulses per second hits the stop 26.
  • the effect of the layer thickness of the stop 26 and of the adhesive 27 is so damping during the impact that no rebound phenomena occur.
  • the air gap 31 formed on a yoke leg 14a is set extremely precisely in the retracted position and is kept of the same size during a high number of pulses which are generated by energizing the electromagnetic coil 14b in order to generate 4 pressure points on the recording medium 1a with the printing needles.
  • the design of the pressure needle adjustment assembly 3 is not of primary importance with regard to the energy consumption of the electromagnetic coils 14b, the armature 25 and the pressure needles 4, the design of the pressure needle adjustment assembly 3 nevertheless has a constructive effect on the design of the pressure needle drive assembly 2, with certain influences not being completely prevented are.
  • the Drucknadelverstellbautechnik 3 can therefore be designed differently than shown and described in the drawing.
  • the connection point of the rear housing 17 with the centering bushing 19 and the connection of the centering bushing 19 with the core bushing 16 via the screw 20 is significant with regard to the setting of the air gap 31, based on the spring washer 22.
  • the needle adjusting assembly 3 it is of course possible to use the needle adjusting assembly 3 to be completely disregarded, ie to store the printing needles 4 in the usual manner within a combined housing, which is formed in one piece by the front housing 5 and the rear housing 17, in conventional guides up to the mouthpiece 7, this mouthpiece then not having to be adjustable.

Abstract

Rebounding of armatures driving print needles in a matrix print head, the armatures being arranged in a star pattern, is prevented by having them abutting against a ring, preferably of fluoro rubber having hardness from 60 to 90 shore A and being bonded to a central sleeve, preferably made of aluminum, by two component adhesive that can withstand at least 100 degrees C, preferably epoxy resin and a modified amide.

Description

Die Erfindung betrifft einen Matrixdruckkopf mit Drucknadeln, die zur punkteweisen Bildung von Schriftzeichen auf einem Aufzeichungs­träger wahlweise mittels einer jeder Drucknadel zugeordneten Elektro­magnetspule mit Anker zum Druck antreibbar sind, wobei die Druck­nadeln in einem vorderen Gehäuse gelagert und gefürt sind und die Anker in einem hinteren Gehäuse und wobei die Elektromagnetspulen und die zugehörigen Jochkörper zu einem Magnetblock auf einer Grundplatte zusammengefaßt sind und die Grundplatte mit dem vorderen Gehäuse ver­bunden ist, die Anker jeweils zwischen dem vorderen Gehäuse und einem der Schenkel des Magnetjoches schwenkbar gelagert und mit ihrem radial inneren Teil einerseits mit der Drucknadel während der Druckbe­wegung in Kraftschluß stehen und andererseits in zurückgeschwenkter Stellung an einem ringscheibenförmigen axial wirkenden federnden Anschlag anliegen, der selbst an einer Kernbuchse axial festgelegt ist.The invention relates to a matrix printhead with printing needles, which can be driven for printing point-by-point characters on a record carrier either by means of an electromagnetic coil associated with each printing needle with armature for printing, the printing needles being mounted and guided in a front housing and the armatures in a rear housing and the electromagnetic coils and the associated yoke body are combined to form a magnetic block on a base plate and the base plate is connected to the front housing, the armatures are each pivotably mounted between the front housing and one of the legs of the magnetic yoke and with their radially inner part on the one hand with the pressure needle are in frictional engagement during the pressure movement and, on the other hand, bear in the pivoted-back position against an annular disk-shaped, axially acting, resilient stop which is itself axially fixed to a core bushing.

Es ist bei Matrixdruckköpfen der bezeichneten Bauart bekannt, zur Dämpfung der Ankerschwingungen Flachringe aus elastischen Materialien einzusetzen (US-PS 4,230,412). Eine nachteilige Begleiterscheinung solcher federnder Flachringe tritt durch Änderung des Luftspaltes auf, der zwischen Anker und Stirnseite eines der Magnetjochschenkel vorhan­den sein muß. Der Luftspalt unterliegt einer extremen Genauigkeit, weil von der Größe des Luftspaltes der Weg der Drucknadeln abhängt. Die in Bewegung versetzte Masse des Ankers veranlaßt die Drucknadeln u. U. zu hart auf das Farbband bzw. das Druckmedium (Papier) bzw. das Druck­widerlager zu schlagen, wobei beim Zurückschlagen die Flachringe zu Prellschlägen führen können. Außerdem ist noch in Betracht zu ziehen, daß das Farbband quer zum Druckmedium bewegt wird, so daß zumindest zwei Relativebewegungskomponenten zwischen den Drucknadeln und dem Farbband auftreten. In Extremfällen treten sog. Farbbandreißer auf, weil die Nadeln in das Farbband einreißen. Hierbei ist ein Rückprallen des Ankers bzw. ein ungewolltes Zurückprallen der Drucknadeln ebenfalls nicht ausgeschlossen. Die elastischen Materialien der Flachringe bereiten weiterhin Schwierigkeiten in bezug auf die einzelnen Druck­ nadeln. Es ist festgestellt worden, daß die Drucknadeln unterschied­liche Hübe ausführen, was sich in einem verschlechterten Druckbild äußert. Derartige mit Rückprall arbeitende Matrixdruckköpfe zeigen im übrigen eine sehr stark verkürzte Lebensdauer.It is known in matrix print heads of the type described to use flat rings made of elastic materials to dampen the armature vibrations (US Pat. No. 4,230,412). A disadvantageous side effect of such resilient flat rings occurs by changing the air gap that must be present between the armature and the end face of one of the magnet yoke legs. The air gap is subject to extreme accuracy because the path of the pressure needles depends on the size of the air gap. The moving mass of the armature causes the pressure needles u. U. To hit too hard on the ribbon or the print medium (paper) or the pressure abutment, whereby the flat rings can lead to bouncing when beating back. In addition, it should also be considered that the ribbon is moved transversely to the print medium so that at least two relative movement components occur between the printing needles and the ribbon. In extreme cases, so-called ribbon tears occur because the needles tear into the ribbon. A rebound of the armature or an unwanted rebound of the printing needles is also not excluded. The elastic materials of the flat rings continue to cause difficulties with regard to the individual pressure needles. It has been found that the printing needles perform different strokes, which is reflected in a deteriorated print image. Such rebound matrix printheads also have a very much shorter service life.

Der Erfindung liegt die Aufgabe zugrunde, die Flachringe dahingehend zu verbessern, daß keine Rückprallerscheinungen der Drucknadeln bzw. der Anker auftreten, um die aufgezeigten Schwierigkeiten zu vermeiden.The invention has for its object to improve the flat rings in such a way that no rebound phenomena of the pressure needles or the armature occur in order to avoid the difficulties outlined.

Die gestellte Aufgabe wird bei der eingangs bezeichneten Gestaltung des Matrixdruckkopfes erfindungsgemäß dadurch gelöst, daß der ring­scheibenförmige Anschlag aus Schwingungen des Ankers absorbierendem Werkstoff von einer Härte zwischen 60 Shore A bis 90 Shore A besteht und mit der Kernbuchse mittels minimal bis 100 Grad C temperaturbe­ständigen Klebemitteln fest verbunden ist. Eine derartige Verbindung des Anschlags mit der Kernbuchse wurde in schwierigen und langwierigen Versuchen gefunden. Als Ergebnis dieser Verscuche wurden weitestgehend gleiche Hübe der Drucknadeln erzielt, und Rückprallerscheinungen wurden ganz entscheidend vermindert. Weiterhin konnte die Lebensdauer derarti­ger Matrixdruckköpfe entscheidend gesteigert werden.The stated object is achieved according to the invention in the design of the matrix printhead that the ring-shaped stop consists of vibrations of the armature-absorbing material with a hardness between 60 Shore A to 90 Shore A and is fixed to the core bushing by means of adhesives which are temperature-resistant to a minimum of 100 degrees C. connected is. Such a connection of the stop to the core socket has been found in difficult and lengthy tests. As a result of this experiment, the strokes of the pressure needles were largely the same, and the rebound phenomena were reduced considerably. Furthermore, the service life of such matrix print heads could be increased significantly.

Die weitestgehende Dämpfung wird z.B. dadurch erzielt, daß der ringscheibenförmige Anschlag aus Fluor-Kautschuk gebildet ist.The greatest possible damping is e.g. achieved in that the washer-shaped stop is made of fluorine rubber.

Die Haltbarkeit der Verbindung wird dadurch gewährleistet, daß das minimal bis 100 Grad C temperaturbeständige Klebemittel aus einem Zweikomponenten-Klebstoff mit einem Epoxidharz als Bindemittel und einem modifizierten Amid als Härter besteht.The durability of the connection is ensured by the fact that the adhesive, which is resistant to temperatures of up to 100 degrees C, consists of a two-component adhesive with an epoxy resin as a binder and a modified amide as a hardener.

Das Rückprallverhalten und die Haltbarkeit der Verbindung wird außerdem dadurch positiv beeinflußt, daß die Kernbuchse aus Aluminium oder aus einer Aluminium-Legierung hergestellt ist.The rebound behavior and the durability of the connection is also positively influenced by the fact that the core bushing is made of aluminum or an aluminum alloy.

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

  • Fig. 1 einen axialen Längsschnitt durch den gesamten Matrixdruckkopf und
  • Fig. 2 einen Teil des Querschnitts als vergrößerte Einzelheit A gemäß Fig. 1.
An embodiment of the invention is shown in the drawing and will be described in more detail below. Show it:
  • Fig. 1 shows an axial longitudinal section through the entire matrix print head and
  • FIG. 2 shows part of the cross section as enlarged detail A according to FIG. 1.

Der Matrixdruckkopf liegt in Schreibstellung einem Druckwiderlager 1 bzw. einem Aufzeichnungsträger 1a und einem Farbband 1b gegenüber. Das Druckwiderlager 1 ist als runde zylindrische Schreibwalze ausge­führt. Der Matrixdruckkopf ist in eine Drucknadelantriebsbaugruppe 2 und eine Drucknadelverstellbaugruppe 3 gegliedert. Die Drucknadel­verstellbaugruppe 3 dient zur senkrechten Höhenverstellung mehrerer übereinander angeordneter Drucknadeln 4, einer sog. Nadelspalte, um Schönschrift oder Schnellschrift (near letter quality/draft) zu schreiben. Die Drucknadelverstellbaugruppe 3 wird daher nur in ihren wesentlichen Bestandteilen beschrieben. Zur Drucknadelverstellbau­gruppe 3 gehören ein vorderes Gehäuse 5 mit einer Farbbandmaske 6, in deren innerem Ausschnitt ein vertikal auf- und abverstellbares Füh­rungsmundstück 7 vorgesehen ist, das an einem Hebel 8 befestigt ist. Der Hebel 8 ist mittels einer Blattfeder 9 und einer Schraube 10 am vorderen Gehäuse 5 gelagert, wobei die Blattfeder 9 ein spielfreies Gelenk bildet. Die Verstellung des Hebels 8 erfolgt über einen Elek­tromagneten 11, wobei der Hebel 8 gesteuert gegen den (nicht näher gezeigten) Kern des Elektromagneten 11 gezogen oder von diesem wegbe­wegt wird.In the writing position, the matrix print head is opposite a print abutment 1 or a recording medium 1a and an ink ribbon 1b. The platen 1 is designed as a round cylindrical platen. The matrix print head is divided into a print needle drive assembly 2 and a print needle adjustment assembly 3. The printing needle adjustment assembly 3 is used for the vertical height adjustment of a plurality of printing needles 4 arranged one above the other, a so-called needle gap, in order to write fine writing or fast writing (near letter quality / draft). The pressure needle adjusting assembly 3 is therefore only described in its essential components. The push pin adjustment assembly 3 includes a front housing 5 with an ink ribbon mask 6, in the inner cutout of which a vertically up and down adjustable guide mouthpiece 7 is provided, which is attached to a lever 8. The lever 8 is mounted on the front housing 5 by means of a leaf spring 9 and a screw 10, the leaf spring 9 forming a play-free joint. The lever 8 is adjusted by means of an electromagnet 11, the lever 8 being pulled in a controlled manner against the core of the electromagnet 11 (not shown in more detail) or being moved away from it.

Die Verstellung des Hebels 8 bewirkt somit eine Verstellung des Füh­rungsmundstückes 7 mit sämtlichen Drucknadeln 4 in vertikaler Richtung. Die Drucknadelverstellbaugruppe 3 ist noch genauer in der deutschen Offenlegungsschrift 34 12 856 beschrieben.The adjustment of the lever 8 thus brings about an adjustment of the guide mouthpiece 7 with all the printing needles 4 in the vertical direction. The pressure needle adjustment assembly 3 is described in more detail in German Offenlegungsschrift 34 12 856.

Innerhalb der Drucknadelantriebsbaugruppe 2 werden die Drucknadeln 4 in Richtung ihrer Längserstreckung, d.h. in Druckrichtung, bewegt. Für diese Druckbewegung sind auf einer Endplatte 12 in einer Grund­platte 13 jeweils Jochkörper 14 für jede einzelne Drucknadel 4 befe­stigt. Die äußeren Schenkel 14a tragen jeweils eine Elektromagnet­spule 14b. Die Jochkörper 14, die Grundplatte 13, die Elektromagnet­spulen 14b bilden einen Magnetblock 15. In der Grundplatte 13 ist eine Kernbuchse 16 vorgesehen. In einem hinteren Gehäuse 17, das mit dem vorderen Gehäuse 5 mittels Schrauben 18 verbunden ist, erstreckt sich eine Zentrierbuchse 19 (Fig. 2) bis in die Kernbuchse 16. Eine Schraube 20 liegt mit ihrem Kopf 21 an einem Ringabsatz 16a der Kern­buchse 16 an und zieht die Zentrierbuchse 19 mit deren Ringabsatz 19a gegen den Ringabsatz 16a, wodurch das hintere Gehäuse 17 mit dem Magnetblock 15 zu einer Einheit verbunden wird.Within the printing needle drive assembly 2, the printing needles 4 are moved in the direction of their longitudinal extension, i.e. in the printing direction. For this pressure movement, yoke bodies 14 for each individual printing needle 4 are fastened on an end plate 12 in a base plate 13. The outer legs 14a each carry an electromagnetic coil 14b. The yoke body 14, the base plate 13, the electromagnetic coils 14b form a magnetic block 15. A core bushing 16 is provided in the base plate 13. In a rear housing 17, which is connected to the front housing 5 by means of screws 18, a centering bushing 19 (FIG. 2) extends into the core bushing 16. A screw 20 rests with its head 21 on a ring shoulder 16a of the core bushing 16 and pulls the centering sleeve 19 with its ring shoulder 19a against the ring shoulder 16a, whereby the rear housing 17 is connected to the magnetic block 15 into one unit.

Unter einem äußeren Ringabsatz 16b der Kernbuchse 16 ist eine Feder­scheibe 22 eingefügt, die das Bestreben der Kernbuchse 16 bewirkt, entgegen der Kraft der Schraube 20 zu arbeiten.A spring washer 22 is inserted under an outer ring shoulder 16b of the core bushing 16, which causes the core bushing 16 to work against the force of the screw 20.

Innerhalb des hinteren Gehäuses 17 bildet ein Kunststoffring 23 ein Schwenklager 24 für jeweils einen Anker 25, der mit seinem vorderen Ende 25a in zurückgezogener Position der Drucknadel 4 gegen einen ringscheibenförmigen Anschlag 26 satt anliegt. Der ringscheibenför­mige Anschlag 26 (z.B. aus Fluor-Kautschuk hergestellt) ist mittels eines temperaturbeständigen Klebemittels 27 auf die Stirnseite der Kernbuchse 16 aufgeklebt. In derselben zurückgezogenen Postion liegen die Drucknadeln 4 mit ihrem Nadelkopf 4a jeweils gegen die vorderen Enden 25a der Anker 25 an. Die Nadelköpfe 4a werden hierbei mittels Schraubenfedern 28 gegen den Anschlag 25 gedrückt, die sich gegen ein Widerlager 29 stützen, das konzentrisch zu Nadelbohrungen 17a in dem hinteren Gehäuse 17 angeordnet ist. Die Lage des Nadelkopfes 4a in bezug auf den Anker 25 wird durch den Abstand "1" festgelegt. Um das Schwenklager 24 ergeben sich Maße "a" für den Abstand des hinteren Endes 25b des Ankers 25 bis zur Mittelachse 30, "b" vom Schwenklager 24 bis zur Mitte des Nadelkopfes 4a bei Anlage an das vordere Ende 25a des Ankers 25, "c" von dem Schwenklager 24 bis zum hinteren Ende 25b des Ankers 25. Die Maße a, b, c bestimmen die Energie- und Kraftverhältnisse, wenn der Anker mit mehr als 800 Impulsen pro Sekunde gegen den Anschlag 26 trifft. Die Wirkung der Schichtdicke des Anschlags 26 und des Klebemittels 27 ist während des Aufpralls derart dämpfend, daß keine Rückprallerscheinungen auftreten. Ferner wird der an einem Jochschenkel 14a gebildete Luftspalt 31 äußerst genau in der zurückgezogenen Position eingestellt und während einer hohen Zahl von Impulsen, die durch Bestromung der Elektromagnetspule 14b entstehen, um mit den Drucknadeln 4 Druckpunkte auf dem Auf­zeichnungsträger 1a zu erzeugen, gleichgroß gehalten.Within the rear housing 17, a plastic ring 23 forms a pivot bearing 24 for an armature 25, which with its front end 25a in the retracted position of the pressure needle 4 fits snugly against an annular disk-shaped stop 26. The annular disk-shaped stop 26 (for example made of fluorine rubber) is glued onto the end face of the core bushing 16 by means of a temperature-resistant adhesive 27. In the same retracted position, the printing needles 4 rest with their needle head 4a against the front ends 25a of the armatures 25. The needle heads 4a are pressed against the stop 25 by means of helical springs 28, which are supported against an abutment 29 which is arranged concentrically with needle bores 17a in the rear housing 17. The position of the needle head 4a with respect to the armature 25 is determined by the distance "1". Around the pivot bearing 24 there are dimensions "a" for the distance from the rear end 25b of the armature 25 to the central axis 30, "b" from the pivot bearing 24 to the center of the needle head 4a when it bears against the front end 25a of the armature 25, "c" from the pivot bearing 24 to the rear end 25b of the armature 25. The dimensions a, b, c determine the energy and force ratios when the Anchor with more than 800 pulses per second hits the stop 26. The effect of the layer thickness of the stop 26 and of the adhesive 27 is so damping during the impact that no rebound phenomena occur. Furthermore, the air gap 31 formed on a yoke leg 14a is set extremely precisely in the retracted position and is kept of the same size during a high number of pulses which are generated by energizing the electromagnetic coil 14b in order to generate 4 pressure points on the recording medium 1a with the printing needles.

Obgleich die detaillierte Gestaltung der Drucknadelsverstellbaugruppe 3 hinsichtlich der Energieaufnahme der Elektromagnetspulen 14b, der Anker 25 und der Drucknadeln 4 keine primäre Bedeutung besitzt, wirkt sich die Gestaltung der Drucknadelverstellbaugruppe 3 doch konstruk­tiv auf die Gestaltung der Drucknadelantriebsbaugruppe 2 aus, wobei gewisse Einflüsse nicht ganz zu verhindern sind. Die Drucknadelver­stellbaugruppe 3 kann daher auch anders gstaltet seie als in der Zeichnung dargestellt und beschrieben. Insbesondre die Verbindungs­stelle des hinteren Gehäuses 17 mit der Zentrierbuchse 19 und die Verbindung der Zentrierbuchse 19 mit der Kernbuchse 16 über die Schraube 20 ist bedeutungsvoll im Hinblick auf die Einstellung des Luftspaltes 31, bezogen auf die Federscheibe 22. Es ist selbstver­ständlich möglich, die Nadelverstellbaugruppe 3 völlig außer acht zu lassen, d.h. die Drucknadeln 4 in der üblichen Weise inneralb eines vereinigten Gehäuses, das durch das vordere Gehäuse 5 und das hintere Gehäuse 17 einstückig gebildet wird, in üblichen Führungen bis zum Mundstück 7 zu lagern, wobei dieses Mundstück dann nicht verstellbar sein muß.Although the detailed design of the pressure needle adjustment assembly 3 is not of primary importance with regard to the energy consumption of the electromagnetic coils 14b, the armature 25 and the pressure needles 4, the design of the pressure needle adjustment assembly 3 nevertheless has a constructive effect on the design of the pressure needle drive assembly 2, with certain influences not being completely prevented are. The Drucknadelverstellbaugruppe 3 can therefore be designed differently than shown and described in the drawing. In particular, the connection point of the rear housing 17 with the centering bushing 19 and the connection of the centering bushing 19 with the core bushing 16 via the screw 20 is significant with regard to the setting of the air gap 31, based on the spring washer 22. It is of course possible to use the needle adjusting assembly 3 to be completely disregarded, ie to store the printing needles 4 in the usual manner within a combined housing, which is formed in one piece by the front housing 5 and the rear housing 17, in conventional guides up to the mouthpiece 7, this mouthpiece then not having to be adjustable.

Claims (4)

1. Matrixdruckkopf mit Drucknadeln, die zur punktweisen Bildung von Schriftzeichen auf einem Aufzeichnungsträger wahlweise mittels einer jeder Drucknadel zugeordneten Elektromagnetspule mit Anker zum Druck antreibbar sind, wobei die Drucknadeln in einem vorderen Gehäuse gelagert und geführt sind und die Anker in einem hinteren Gehäuse und wobei die Elektromagnetspulen und die zugehörigen Jochkör­per zu einem Magnetblock auf einer Grundplatte zusammengefaßt sind und die Grundplatte mit dem vorderen Gehäuse verbunden ist, die Anker jeweils zwischen dem vorderen Gehäuse und einem der Schenkel des Magnetjoches schwenkbar gelagert und mit ihrem radial inneren Teil einerseits mit der Drucknadel während der Druckbewegung in Kraft­schluß stehen und andererseits in zurückgeschwenkter Stellung an einem ringscheibenförmigen axial wirkenden federnden Anschlag anliegen der selbst an einer Kernbuchse axial festgelegt ist,
dadurch gekennzeichnet,
daß der ringscheibenförmige Anschlag (26) aus Schwingungen des Ankers (25) absorbierendem Werkstoff von einer Härte zwischen 60 Shore A bis 90 Shore A besteht und mit der Kernbuchse (16) mittels minimal bis 100 Grad C temperaturbeständigen Klebemitteln (27) fest verbunden ist.1.Matrix printhead with printing needles, which can be driven for printing punctiform characters on a recording medium either by means of an electromagnetic coil associated with each printing needle with armature for printing, the printing needles being mounted and guided in a front housing and the armatures in a rear housing and the Electromagnetic coils and the associated yoke body are combined to form a magnetic block on a base plate and the base plate is connected to the front housing, the armature each pivotably mounted between the front housing and one of the legs of the magnetic yoke and with its radially inner part on the one hand with the pressure needle during the Pressure movement in frictional connection and on the other hand in the pivoted back position against an annular disc-shaped axially acting resilient stop which is itself axially fixed to a core bushing,
characterized,
that the annular disk-shaped stop (26) consists of vibrations of the armature (25) absorbing material with a hardness between 60 Shore A to 90 Shore A and is firmly connected to the core bushing (16) by means of adhesives (27) that are temperature-resistant to a minimum of 100 degrees C. 2. Matrixdruckkopf nach Anspruch 1,
dadurch gekennzeichnet,
daß der ringscheibenförmige Anschlag (26) aus Fluor-Kautschuk gebildet ist.2. matrix print head according to claim 1,
characterized,
that the annular disc-shaped stop (26) is made of fluorine rubber. 3. Matrixdruckkopf nach den Ansprüchen 1 und 2,
dadurch gekennzeichnet,
daß das minimal bis 100 Grad C temperaturbeständige Klebemittel (27) aus einem Zweikomponenten-Klebstoff mit einem Epoxidharz als Bindemittel und einem modifizierten Amid als Härter besteht.3. matrix print head according to claims 1 and 2,
characterized,
that the minimum temperature-resistant to 100 degrees C adhesive (27) consists of a two-component adhesive with an epoxy resin as a binder and a modified amide as a hardener. 4. Matrixdruckkopf nach den Ansprüchen 1 bis 3,
dadurch gekennzeichnet,
daß die Kernbuchse (16) aus Aluminium oder aus einer Aluminium-­Legierung hergestellt ist.4. matrix print head according to claims 1 to 3,
characterized,
that the core bushing (16) is made of aluminum or an aluminum alloy.
EP86115255A 1985-11-16 1986-11-04 Matrix print head Expired EP0223148B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86115255T ATE44910T1 (en) 1985-11-16 1986-11-04 MATRIX PRINT HEAD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3540761 1985-11-16
DE19853540761 DE3540761A1 (en) 1985-11-16 1985-11-16 MATRIX PRINT HEAD

Publications (2)

Publication Number Publication Date
EP0223148A1 true EP0223148A1 (en) 1987-05-27
EP0223148B1 EP0223148B1 (en) 1989-07-26

Family

ID=6286213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86115255A Expired EP0223148B1 (en) 1985-11-16 1986-11-04 Matrix print head

Country Status (5)

Country Link
US (1) US4822187A (en)
EP (1) EP0223148B1 (en)
JP (1) JPS62121066A (en)
AT (1) ATE44910T1 (en)
DE (2) DE3540761A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0239947A (en) * 1988-07-29 1990-02-08 Seikosha Co Ltd Printing head
DE58908638D1 (en) * 1989-09-18 1994-12-15 Mannesmann Ag Matrix needle print head.
DE4020015C1 (en) * 1990-06-20 1991-09-26 Mannesmann Ag, 4000 Duesseldorf, De
US5188466A (en) * 1991-06-27 1993-02-23 Mannesmann Aktiengesellschaft Matrix pin print head with rebound control
JP2806414B2 (en) * 1992-08-18 1998-09-30 富士通株式会社 Electromechanical transducer and printhead
DE10257014B4 (en) * 2002-12-06 2005-12-01 Tally Computerdrucker Gmbh Matrix needle printhead for computer printers, in particular printhead type printhead

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US4140406A (en) * 1977-06-13 1979-02-20 Dataproducts Dot matrix print head
US4230412A (en) * 1978-03-17 1980-10-28 Helmut Falk Matrix print head assembly
DE3412855A1 (en) * 1984-04-03 1985-10-03 Mannesmann AG, 4000 Düsseldorf MATRIX PRINT HEAD

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US3896918A (en) * 1971-03-04 1975-07-29 Winfried Schneider Mosaic printing head with electromagnetically actuated needles with a common yoke for all electromagnets
FR2287340A1 (en) * 1974-10-08 1976-05-07 Sagem IMPROVEMENTS MADE TO DEVICES OR PRINTING HEADS FOR PRINTERS OR SIMILAR AND METHOD OF MANUFACTURING SUCH A PRINTING HEAD
US3994218A (en) * 1974-12-18 1976-11-30 Teletype Corporation Energy absorbing print hammer bumper with internal stabilizer
US4051941A (en) * 1976-06-28 1977-10-04 Xerox Corporation Matrix print head with improved armature retainer
US4064799A (en) * 1976-11-26 1977-12-27 Teletype Corporation Print hammer bumper exhibiting dual resiliency characteristics
DE2800218C2 (en) * 1978-01-04 1980-02-07 Triumph Werke Nuernberg Ag, 8500 Nuernberg Dot matrix print head
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Publication number Priority date Publication date Assignee Title
US4140406A (en) * 1977-06-13 1979-02-20 Dataproducts Dot matrix print head
US4230412A (en) * 1978-03-17 1980-10-28 Helmut Falk Matrix print head assembly
DE3412855A1 (en) * 1984-04-03 1985-10-03 Mannesmann AG, 4000 Düsseldorf MATRIX PRINT HEAD

Also Published As

Publication number Publication date
ATE44910T1 (en) 1989-08-15
DE3664596D1 (en) 1989-08-31
EP0223148B1 (en) 1989-07-26
JPS62121066A (en) 1987-06-02
DE3540761C2 (en) 1989-04-06
DE3540761A1 (en) 1987-05-21
US4822187A (en) 1989-04-18

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