EP0157727B1 - Matrix print head - Google Patents

Matrix print head Download PDF

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Publication number
EP0157727B1
EP0157727B1 EP85730036A EP85730036A EP0157727B1 EP 0157727 B1 EP0157727 B1 EP 0157727B1 EP 85730036 A EP85730036 A EP 85730036A EP 85730036 A EP85730036 A EP 85730036A EP 0157727 B1 EP0157727 B1 EP 0157727B1
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EP
European Patent Office
Prior art keywords
print head
hinged
armatures
base plate
magnetic
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
EP85730036A
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German (de)
French (fr)
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EP0157727A2 (en
EP0157727A3 (en
Inventor
Bernd Dipl.-Ing. Gugel
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Vodafone GmbH
Original Assignee
Mannesmann AG
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Priority to AT85730036T priority Critical patent/ATE56182T1/en
Publication of EP0157727A2 publication Critical patent/EP0157727A2/en
Publication of EP0157727A3 publication Critical patent/EP0157727A3/en
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Publication of EP0157727B1 publication Critical patent/EP0157727B1/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
    • 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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/377—Cooling or ventilating arrangements

Definitions

  • the invention relates to a matrix printhead with printing needles that can be driven for printing punctiform characters on a record carrier either by means of an electromagnetic coil assigned to each printing needle with magnetic folding armature for printing, the printing needles resting against the inner ends of the assigned folding anchors and in a front Part of the printhead housing are stored and guided and the magnetic folding anchors in the rear part of the printhead housing and wherein the electromagnetic coils are combined to form a magnetic block on a base plate and the base plate is connected to the printhead housing, the base plate of the magnetic block being together with the magnetic yokes consists of a one-piece coil holder receiving the electromagnetic coils, the coil holder is connected to a coaxially aligned core bushing, the pressure needles extend away from the side of the magnetic flap armature, which is the side facing the base plate r
  • the hinged armature is opposite and the hinged armature pivot point lies between the two hinged armature ends and on the respective inner pole legs of the magnetic yokes.
  • Such matrix print heads produce matrix dots in matrix printers by means of reciprocating movements in front of the parallel printing abutment (platen roller) via an ink ribbon on the recording medium, which result in alphanumeric characters when the recording medium is fed continuously or step by step.
  • the frequency when the individual printing needles are fired is of crucial importance for the printing speed.
  • the structure of the needle drive assembly is essential for printing precision and for the life of the matrix printhead.
  • Matrix printheads with printing needles are known, the construction of which is relatively complicated, so that manufacturing inaccuracies occur in several places, which, in sum, represent considerable bearing errors for printing needles, magnet armatures and other moving parts. For this reason, such matrix print heads operate relatively imprecisely and are subject to great wear, which is also determined in part by heating, so that the service life of such matrix print heads is limited.
  • the matrix print head described at the outset is known from GB-A-2 075 427.
  • the core bushing is not rigidly connected to the coil carrier, but rather is pressed against one another in an adjustable manner by means of an elastic spacer ring and connecting screws, in order to be able to set the stop point for the inner ends of the magnetic folding anchors and thus their air gap.
  • This floating mounting can cause the core bushing to tilt, so that the abutment surface assumes an oblique position and the magnetic flap armature air gaps are no longer the same size as one another.
  • EP-A-0 112 274 which has not been previously published, describes a dot matrix printhead for matrix printers, which contains a coil carrier made of a cast or sprayed base body as a yoke carrier made of electrically non-conductive material, in which pocket-shaped recesses are arranged, in each of which a magnetic yoke made of magnetizable material is inserted .
  • the base body itself is provided with a stop surface which is deliberately related to the plane of all yoke end faces and therefore solves the tolerance problem coming from another side.
  • the invention is therefore based on the object of proposing a matrix print head for matrix printers which, while avoiding the disadvantages described, initially allows economic tolerances in principle with regard to the accuracy of the manufacture of the individual parts or the individual assemblies, and which also has functional stability, i.e. a long service life, and which is ultimately economically mountable.
  • the stated object is achieved according to the invention in the matrix print head described in the introduction in that the coil carrier is rigidly connected to the core bushing, the end face of the core bushing facing the inner hinged anchor ends lying in a precise tolerance distance from the end face of the magnetic yokes by subsequent processing, and in that on the core bushing A stop disk is arranged centrally for the inner ends of the magnetic flap anchors in such a way that its stop face lies at a tolerance distance from the end face of the magnetic yokes.
  • the coil carrier is rigidly connected to the core bushing and the subsequent end face of the core bushing lies in a precise tolerance distance from the end face of the magnetic yokes, it is ensured that the end faces in question are arranged exactly parallel to one another and perpendicular to the longitudinal axis of the print head, so that the air gaps remain constant with each other.
  • the invention combines the advantages of economical production with economical manufacturing tolerance and also has the advantage of reduced assembly time, and the matrix print head according to the invention achieves a stability during operation that has not been achieved so far, so that a longer service life is achieved.
  • the stability of the magnetic block and the low-wear power transmission from the electromagnetic coils to the pressure wires is achieved according to further features of the invention in that the base plate of the magnetic block has a ring forming a base, on which the magnetic yokes are integrally formed and made of the same material in the investment casting process or in the sintering process.
  • the cost-effectiveness of manufacturing an assembly previously composed of several individual parts with appropriate dimensional accuracy, corresponding tolerance quality and corresponding durability is further achieved in that the one-piece coil carrier consists of an iron-silicon alloy.
  • the stop disc as a damping stop means for the backward movement of the magnetic flap armature, covers an end face of the core bushing made of plastic, thermally insulating.
  • the matrix print head with its print needle guide assembly 1, is opposite the print abutment 2, which consists of the platen roller 2a.
  • the ribbon 4 is also located in front of the recording medium 3.
  • the print needle guide assembly 1 has a print needle housing 5 a as part of the print head housing 5.
  • Guides 6 and 7 for the printing needles 8 are arranged in the printing needle housing 5a.
  • the column of printing needles 8, i.e. several, e.g. five to twelve, superimposed printing needles 8 are also guided in the guide mouthpiece 9 very close to the pressure abutment 2.
  • the guide mouthpiece 9 is also fastened to the guide carrier 10 and adjustable in two height positions by means of the stop 11, the spring 12, the electromagnet 13 and the adjustable working air gap 14. However, the height adjustment is not part of the present invention.
  • the pressure needles 8 can therefore also be guided in a height-adjustable manner in the guide mouthpiece 9.
  • the printing needle drive assembly 15 has a connection housing 5b, which is kept by means of shims 16 at a distance from the printing needle housing 5a, which allows the position of the printing needles 8 on the guide mouthpiece 9 to be readjusted or readjusted at any time during the lifetime of the matrix print head.
  • the pressure needles 8 are supported in a rear pressure needle bearing 17 and their needle head 8a abuts against a bearing surface 17a via the compression spring 8b.
  • a magnetic folding armature 18 is provided, which bears against the needle head 8a, is also supported on a conventional plastic ring 19 and can be actuated by means of the electromagnet 20.
  • the electromagnetic coils 21 and the magnetic yokes 22a and 22b with further features are combined to form a magnetic block 23 and shown separately in FIG. 2.
  • the magnet block 23 is drawn without the winding of the electromagnetic coils 21.
  • the magnet block 23 has a base plate 24, which forms a ring 24a, on which the magnet yokes 22a and 22b are integrally formed, so that the base plate 24 (ring 24a) together with the magnet yokes 22a and 22b form a one-piece coil carrier 25 .
  • the base plate 24 is connected to a core bushing 27 by a press connection 26.
  • the core bushing 27 forms a transition to a receiving collar 27b by means of ribs 27a.
  • the core bushing 27 is machined on the end face 28 or on the end face 29, if machining should not have already become unnecessary due to the manufacturing process (investment casting process, sintering process).
  • the stop disc 31 On the core sleeve 27 is the stop disc 31, which consists of a tough and wear-resistant plastic or the like.
  • the core bushing 27 is simultaneously configured to form a heat sink 32 with cooling fins 33.
  • the stop disc 31 forms a centering projection 31a, a stop surface 31b, which is of course at a tolerance distance from the end face 29.
  • the stop disk 31 also forms a recess 31c between two ribs 27a, through which connecting cables 34a and 34b run to the electromagnetic coils 21 (FIG. 3).
  • FIG. 1 Another design of a stop disk 35, which, however, fulfills the same functions and properties of the stop disk (31), is shown in Fig. 1, the only differences tion represents the laying of the recesses 31c: There are other recesses 36 through the ring 24a and through the receiving collar 27b. However, both the recess 31c and the recess 36 lie within the largest diameter of the matrix print head.

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  • Impact Printers (AREA)
  • Magnetic Heads (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)

Abstract

1. A matrix print head with printing wires (8) which can be operated to print selectively by means of an electromagnet coil (21) allocated to each printing wire (8) with magnetic hinged armatures (18) for the dot-wise formation of characters on a record carrier (3), with the printing wires (8) resting against the inner ends of the associated hinged armatures (18) and being mounted and guided in a forward part of the print head housing (5) and the magnetic hinged armatures (18) in the rear part of the print head housing (5), and with the electromagnet coils (21) being combined on a base plate (24) to form a magnet block (23) and the base plate (24) being connected to the print head housing (5), with the base plate (24) of the magnet block (23) together with the magnet yokes (22a and 22b) consisting of a one-piece coil holder (25) receiving the electromagnet coils (21), the coil holder (25) being connected to a coaxially aligned core bushing (27), the printing wires (8) extending away from the side of the magnetic hinged armatures (18) which is opposite the side of these hinged armatures (18) facing the base plate (24), and the point of rotation of the hinged armatures being located between the two hinged armature ends and on the respective inner pole arms (22b) of the magnet yokes (22a, 22b), characterised in that the coil holder (25) is rigidly connected to the core bushing (27), with the end face (28) of the core bushing (27) which faces the inner hinged armature ends lying at an exact tolerance distance (30) from the end face (29) of the magnet yokes (22a, 22b) due to subsequent machining, and that a stop disc (31) is arranged on the core bushing (27) centrally for the inner ends of the magnetic hinged armatures (18) in such a manner that its stop surface (31b) is at a tolerance distance from the end face (29) of the magnet yokes (22a, 22b).

Description

Die Erfindung betrifft einen Matrixdruckkopf mit Drucknadeln, die zur punktweisen Bildung von Schriftzeichen auf einem Aufzeichnungsträger wahlweise mittels einer jeder Drucknadel zugeordneten Elektromagnetspule mit Magnet-Klapp-Anker zum Druck antreibbar sind, wobei die Drucknadeln gegen die inneren Enden der zugeordneten Klappanker anliegen und in einem vorderen Teil des Druckkopf-Gehauses gelagert und geführt sind und die Magnet-Klapp-Anker in dem hinteren Teil des Druckkopf-Gehäuses und wobei die Elektromagnetspulen zu einem Magnetblock auf einer Grundplatte zusammengefaßt und die Grundplatte mit dem DruckkopfGehäuse verbunden ist, wobei die Grundplatte des Magnetblocks zusammen mit den Magnetjochen aus einem einstückigen, die Eletromagnetspulen aufnehmenden Spulenträger besteht, der Spulenträger mit einer koaxial ausgerichteten Kernbuchse verbunden ist, die Drucknadeln sich von der Seite der Magnetklappanker wegerstrekken, welche der der Grundplatte zugewandten Seite dieser Klappanker gegenüberliegt und der Klappanker- drehpunkt zwischen beiden Klappankerenden, und auf den jeweiligen inneren Polschenkeln der Magnetjoche liegt.The invention relates to a matrix printhead with printing needles that can be driven for printing punctiform characters on a record carrier either by means of an electromagnetic coil assigned to each printing needle with magnetic folding armature for printing, the printing needles resting against the inner ends of the assigned folding anchors and in a front Part of the printhead housing are stored and guided and the magnetic folding anchors in the rear part of the printhead housing and wherein the electromagnetic coils are combined to form a magnetic block on a base plate and the base plate is connected to the printhead housing, the base plate of the magnetic block being together with the magnetic yokes consists of a one-piece coil holder receiving the electromagnetic coils, the coil holder is connected to a coaxially aligned core bushing, the pressure needles extend away from the side of the magnetic flap armature, which is the side facing the base plate r The hinged armature is opposite and the hinged armature pivot point lies between the two hinged armature ends and on the respective inner pole legs of the magnetic yokes.

Derartige Matrixdruckköpfe erzeugen in Matrixdruckern durch hin- und hergehende Bewegungen vor dem parallel angeordneten Druckwiderlager (Schreibwalse) über ein Farbband auf dem Aufzeichnungsträger Druckpunkte, die bei kontinuierlichen bzw. schrittweisem Vorschub des Aufzeichnungsträgers alphanumerische Zeichen ergeben. Neben der Geschwindigkeit für die Hin- und Herbewegung des Matrixdruckkopfes ist die Frequenz beim Abschießen der einzelnen Drucknadeln von entscheidender Bedeutung für die Druckgeschwindigkeit. Für die Druckpräzision und für die Lebensdauer des Matrixdruckkopfes ist der Aufbau der Durchnadelantriebsbaugruppe von wesentlicher Bedeutung.Such matrix print heads produce matrix dots in matrix printers by means of reciprocating movements in front of the parallel printing abutment (platen roller) via an ink ribbon on the recording medium, which result in alphanumeric characters when the recording medium is fed continuously or step by step. In addition to the speed for the back and forth movement of the matrix print head, the frequency when the individual printing needles are fired is of crucial importance for the printing speed. The structure of the needle drive assembly is essential for printing precision and for the life of the matrix printhead.

Es sind Matrixdruckköpfe mit Drucknadeln bekannt, deren Aufbau verhältnismäßig kompliziert ist, so daß an mehreren Stellen Fertigungsungenauigkeiten auftreten, die summiert beträchtliche Lagerungsfehler für Drucknadeln, Magnetanker und andere bewegliche Teile darstellen. Aus diesem Grund arbeiten derartige Matrixdruckköpfe verhältnismäßig ungenau und unterliegen einem großen Verschleiß, der teilweise auch durch Erwärmung bestimmt wird, so daß die Lebensdauer derartiger Matrixdruckköpfe beschränkt ist.Matrix printheads with printing needles are known, the construction of which is relatively complicated, so that manufacturing inaccuracies occur in several places, which, in sum, represent considerable bearing errors for printing needles, magnet armatures and other moving parts. For this reason, such matrix print heads operate relatively imprecisely and are subject to great wear, which is also determined in part by heating, so that the service life of such matrix print heads is limited.

Der eingangs bezeichnete Matrixdruckkopf ist aus der GB-A-2 075 427 bekannt. Bei dieser bekannten Lösung ist die Kernbuchse mit dem Spulenträger nicht starr verbunden, sondern mittels eines elastischen Distanzringes sowie Verbindungsschrauben gegeneinander einstellbar gepreßt, um den Anschlagpunkt für die inneren Enden der Magnetklappanker und somit deren Luftspalt einstellen zu können. Durch diese schwimmende Lagerung können jedoch Verkantungen der Kernbuchse auftreten, so daß deren Anschlagfläche eine schräge Lage einnimmt und die Magnetklappanker-Luftspalte somit untereinander nicht mehr gleich groß sind.The matrix print head described at the outset is known from GB-A-2 075 427. In this known solution, the core bushing is not rigidly connected to the coil carrier, but rather is pressed against one another in an adjustable manner by means of an elastic spacer ring and connecting screws, in order to be able to set the stop point for the inner ends of the magnetic folding anchors and thus their air gap. This floating mounting can cause the core bushing to tilt, so that the abutment surface assumes an oblique position and the magnetic flap armature air gaps are no longer the same size as one another.

Die nicht vorveröffentlichte EP-A-0 112 274 beschreibt einen Nadeldruckkopf für Matrixdrukker, der einen Spulenträger aus einem gegossenen oder gesprizten Grundkörper als Jochträger aus elektrisch nichtleitendem Werkstoff enthält, in dem taschenförmige Ausnehmungen angeordnet sind, in denen jeweils ein Magnetjoch aus magnetisierbarem Werkstoff eingesetzt ist. Hierbei ist der Grundkörper selbst mit einer Anschlagfläche versehen, die in einem gewollten Bezug zur Ebene aller Jochstirnflächen steht und daher das Toleranzproblem von einer anderen Seite kommend löst.EP-A-0 112 274, which has not been previously published, describes a dot matrix printhead for matrix printers, which contains a coil carrier made of a cast or sprayed base body as a yoke carrier made of electrically non-conductive material, in which pocket-shaped recesses are arranged, in each of which a magnetic yoke made of magnetizable material is inserted . Here, the base body itself is provided with a stop surface which is deliberately related to the plane of all yoke end faces and therefore solves the tolerance problem coming from another side.

Der Erfindung liegt deshalb die Aufgabe zugrunde, einen Matrixdruckkopf für Matrixdrucker vorzuschlagen, der unter Vermeidung der geschilderten Nachteile zunächst bei der Genauigkeit der Herstellung der einzelnen Teile bzw. der einzelnen Baugruppen grundsätzlich wirtschaftliche Toleranzen erlaubt, der ferner eine funktionelle Stabilität aufweist, d.h. eine hohe Lebensdauer, und der letztlich wirtschaftlich montierfähig ist.The invention is therefore based on the object of proposing a matrix print head for matrix printers which, while avoiding the disadvantages described, initially allows economic tolerances in principle with regard to the accuracy of the manufacture of the individual parts or the individual assemblies, and which also has functional stability, i.e. a long service life, and which is ultimately economically mountable.

Die gestellte Aufgabe wird bei dem eingangs bezeichneten Matrixdruckkopf erfindungsgemäß dadurch gelöst, daß der Spulenträger mit der Kernbuchse starr verbunden ist, wobei durch anschließende Bearbeitung die den inneren Klappankerenden zugewandte Stirnfläche der Kernbuchse in einem genauen Toleranzabstand zur Stirnfläche der Magnetjoche liegt, und daß auf der Kernbuchse zentrisch für die inneren Enden der Magnetklappanker eine Anschlagscheibe in der Weise angeordnet ist, daß deren Anschlagfläche in einem Toleranzabstand zur Stirnfläche der Magnetjoche liegt.The stated object is achieved according to the invention in the matrix print head described in the introduction in that the coil carrier is rigidly connected to the core bushing, the end face of the core bushing facing the inner hinged anchor ends lying in a precise tolerance distance from the end face of the magnetic yokes by subsequent processing, and in that on the core bushing A stop disk is arranged centrally for the inner ends of the magnetic flap anchors in such a way that its stop face lies at a tolerance distance from the end face of the magnetic yokes.

Die Lösung vermeidet die geschilderten Nachteile. Da erfindungsgemäß der Spulenträger mit der Kernbuchse starr verbunden ist und durch anschließende Bearbeitung die betreffende Stirnfläche der Kernbuchse in einem genauen Toleranzabstand zur Stirnfläche der Magnetjoche liegt, wird gewährleistet, daß die betreffenden Stirnflächen zueinander genau parallel und senkrecht zur Druckkopflängsachse angeordnet sind, so daß die Luftspalte untereinander konstant bleiben. Die Erfindung verbindet die Vorteile einer wirtschaftlichen Herstellung mit wirtschaftlicher Herstelltoleranz und besitzt ferner den Vorteil einer verminderten Montagezeit, und der erfindungsgemäße Matrixdruckkopf erreicht eine Stabilität während des Betriebes, die bislang nicht erreicht werden konnte, so daß eine höhere Lebensdauer erzielt wird.The solution avoids the disadvantages described. Since, according to the invention, the coil carrier is rigidly connected to the core bushing and the subsequent end face of the core bushing lies in a precise tolerance distance from the end face of the magnetic yokes, it is ensured that the end faces in question are arranged exactly parallel to one another and perpendicular to the longitudinal axis of the print head, so that the air gaps remain constant with each other. The invention combines the advantages of economical production with economical manufacturing tolerance and also has the advantage of reduced assembly time, and the matrix print head according to the invention achieves a stability during operation that has not been achieved so far, so that a longer service life is achieved.

Die Stabilität des Magnetblocks und die verschließarme Kraftübertragung von den Elektromagnetspulen auf die Druckdrähte wird nach weiteren Merkmalen der Erfindung dadurch erzielt, daß die Grundplatte des Magnetblocks einen eine Basis bildenden Ring aufweist, an den die Magnetjoche einstückig und aus demselben Werkstoff im Feingießverfahren oder im Sinterverfahren angeformt sind.The stability of the magnetic block and the low-wear power transmission from the electromagnetic coils to the pressure wires is achieved according to further features of the invention in that the base plate of the magnetic block has a ring forming a base, on which the magnetic yokes are integrally formed and made of the same material in the investment casting process or in the sintering process.

Die Wirtschaftlichkeit der Herstellung einer früher aus mehreren Einzelteilen zusammengesetzten Baugruppe bei entsprechender Maßhaltigkeit, entsprechender Toleranzgüte und entsprechender Beständigkeit wird weiterhin dadurch erreicht, daß der einstückige Spulenträger aus einer Eisen-Silizium-Legierung besteht.The cost-effectiveness of manufacturing an assembly previously composed of several individual parts with appropriate dimensional accuracy, corresponding tolerance quality and corresponding durability is further achieved in that the one-piece coil carrier consists of an iron-silicon alloy.

Der Vorteil eines stabilen Aufbaus bei Verringerung der zu beachtenden Herstellungstoleranzen wird außerdem dadurch begünstigt, daß der einstückige Spulenträger mit der Kernbuchse vernietet ist. Es handelt sich praktisch um nur zwei wesentliche Arbeitsgänge, die zur Herstellung einer für die Montage der Elektromagnetspulen vorbereiteten Spulenträgers erforderlich sind.The advantage of a stable construction while reducing the manufacturing tolerances to be observed is further enhanced by the fact that the one-piece coil carrier is riveted to the core bushing. It is practically only two essential work steps that are required to produce a coil holder prepared for the assembly of the electromagnetic coils.

Eine zusätzliche Verbesserung der ist dadurch gegeben, daß Erfindung, die Anschlagscheibe als dämpfendes Anschlagsmittel für die Rückwärtsbewegung der Magnetklappanker eine dem aus Kunststoff hergestellten Drucknadelgehäuse zugewandte Stirnfläche der Kernbuchse Wärmeisolierend bedeckt.An additional improvement is given by the fact that the invention, the stop disc as a damping stop means for the backward movement of the magnetic flap armature, covers an end face of the core bushing made of plastic, thermally insulating.

Dieser Gedanke wird nunmehr dahingehend weiterentwickelt, daß die wärmeisolierende und die Bewegungen der Magnetklappanker dämpfende Anschlagscheibe mit Ausnehmungen für die Anschlußkabel zu den Elektromagnetspulen versehen ist. Dieser zusätzliche Vorschlag weist den Vorteil auf, daß der Matrixdruckkopf gegen Wärmeentwicklungen der Elektromagnetspulen, die zu einem bestimmten Teil nicht zu vermeiden sind, geschützt wird.This idea is now being developed in such a way that the heat-insulating and damping the movements of the magnetic flap armature stop disc is provided with recesses for the connecting cable to the electromagnetic coils. This additional proposal has the advantage that the matrix print head is protected against heat developments of the electromagnetic coils, which cannot be avoided to a certain extent.

Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im folgenden näher beschrieben.Embodiments of the invention are shown in the drawing and are described in more detail below.

Es zeigen:

  • Fig. 1 einen axialen Querschnitt durch den in Betriebsstellung befindlichen Matrixdruckkopf (ohne den Bewegungsschlitten des Matrixdrukkers),
  • Fig. 2 einen Querschnitt (11-11 gemäß Fig. 3) durch die getrennt dargestellte Baugruppe aus Spulenträger mit Kernbuchse und Anschlagscheibe und
  • Fig. 3 eine Draufsicht zu Fig. 2.
Show it:
  • 1 shows an axial cross section through the matrix print head in the operating position (without the movement slide of the matrix printer),
  • Fig. 2 shows a cross section (11-11 of FIG. 3) through the separately shown assembly of coil carrier with core sleeve and stop disc and
  • 3 is a top view of FIG. 2.

Der Matrixdruckkopf liegt mit seiner Drucknadelführungsbaugruppe 1 dem Druckwiderlager 2 gegenüber, das aus der Schreibwalze 2a besteht. Der Aufzeichnungsträger 3, üblicherweise eine Papierbahn 3a, wird durch die Schreibwalze 2a transportiert. Vor dem Aufzeichnungsträger 3 befindet sich außerdem das Farbband 4.The matrix print head, with its print needle guide assembly 1, is opposite the print abutment 2, which consists of the platen roller 2a. The record carrier 3, usually a paper web 3a, is transported through the platen roller 2a. The ribbon 4 is also located in front of the recording medium 3.

Die Drucknadelführungsbaugruppe 1 weist ein Drucknadelgehäuse 5a als Teil des Druckkopfgehäuses 5 auf. Im Drucknadelgehäuse 5a sind Führungen 6 und 7 für die Drucknadeln 8 angeordnet. Die Spalte der Drucknadeln 8, d.h. mehrere, wie z.B. fünf bis zwölf, übereinanderliegende Drucknadeln 8 sind außerdem in dem Führungsmundstück 9 sehr nahe an dem Druckwiderlager 2 geführt. Das Führungsmundstück 9 ist außerdem an dem Führungsträger 10 befestigt und mittels des Anschlags 11, der Feder 12, des Elektromagneten 13 und des einstellbaren Arbeitsluftspalts 14 in zwei Höhenstellungen einstellbar. Die Höheneinstellung ist jedoch nicht Teil der vorliegenden Erfindung. Die Drucknadeln 8 können daher im Führungsmundstück 9 auch höhenunverstellbar geführt sein.The print needle guide assembly 1 has a print needle housing 5 a as part of the print head housing 5. Guides 6 and 7 for the printing needles 8 are arranged in the printing needle housing 5a. The column of printing needles 8, i.e. several, e.g. five to twelve, superimposed printing needles 8 are also guided in the guide mouthpiece 9 very close to the pressure abutment 2. The guide mouthpiece 9 is also fastened to the guide carrier 10 and adjustable in two height positions by means of the stop 11, the spring 12, the electromagnet 13 and the adjustable working air gap 14. However, the height adjustment is not part of the present invention. The pressure needles 8 can therefore also be guided in a height-adjustable manner in the guide mouthpiece 9.

Die Drucknadelnantriebsbaugruppe 15 weist ein Anschlußgehäuse 5b auf, das mittels Beilagen 16 vom Drucknadelgehäuse 5a auf einen Abstand gehalten wird, der es erlaubt, die Stellung der Drucknadeln 8 am Führungsmundstück 9 grundsätzlich und zu einem beliebigen Zeitpunkt während der Lebenszeit des Matrixdruckkopfes nachzustellen oder neu einzustellen. Die Drucknadeln 8 lagern in einem hinteren Drucknadellager 17 und liegen mit ihrem Nadelkopf 8a über die Druckfeder 8b jeweils gegen eine Lagerfläche 17a an.The printing needle drive assembly 15 has a connection housing 5b, which is kept by means of shims 16 at a distance from the printing needle housing 5a, which allows the position of the printing needles 8 on the guide mouthpiece 9 to be readjusted or readjusted at any time during the lifetime of the matrix print head. The pressure needles 8 are supported in a rear pressure needle bearing 17 and their needle head 8a abuts against a bearing surface 17a via the compression spring 8b.

Außerdem ist in dem Ausführungsbeispiel (Fig. 1) ein Magnetklappanker 18 vorgesehen, der an dem Nadelkopf 8a anliegt, sich außerdem an einem üblichen Kunststoffring 19 abstützt und mittels des Elektromagneten 20 betätigbar ist. Die Elektromagnetspulen 21 und die Magnetjoche 22a bzw. 22b mit weiteren Merkmalen sind zu einem Magnetblock 23 zusammengefaßt und in Fig. 2 getrennt dargestellt.In addition, in the exemplary embodiment (FIG. 1), a magnetic folding armature 18 is provided, which bears against the needle head 8a, is also supported on a conventional plastic ring 19 and can be actuated by means of the electromagnet 20. The electromagnetic coils 21 and the magnetic yokes 22a and 22b with further features are combined to form a magnetic block 23 and shown separately in FIG. 2.

In Fig. 2 ist der Magnetblock 23 ohne die Wicklung der Elektromagnetspulen 21 gezeichnet. Der Magnetblock 23 besitzt eine Grundplatte 24, die einen Ring 24a bildet, an dem die Magnetjoche 22a bzw. 22b aus einem Stück angeformt sind, so daß die Grundplatte 24 (Ring 24a) zusammen mit den Magnetjochen 22a bzw. 22b einen einstückigen Spulenträger 25 bilde. Hierbei ist die Grundplatte 24 durch eine Preßverbindung 26 mit einer Kernbuchse 27 verbunden. Die Kernbuchse 27 bildet durch Rippen 27a einen Übergang zu einem Aufnahmekranz 27b. Die Kernbuchse 27 wird nach Verbindung mit dem Spulenträger 25 auf der Stirnfläche 28 bzw. auf der Stirn-Fläche 29 bearbeitet, falls nicht bereits schon durch den Herstellvorgang (Feingießverfahren, Sinterverfahren) eine Bearbeitung unnötig geworden sein sollte. Bei der Bearbeitung entsteht ein genauer Toleranz-Abstand 30, wobei die Toleranzgüte einfach und wirtschaftlich eingehalten werden kann. Auf der Kernbuchse 27 befindet sich die Anschlagscheibe 31, die aus einem zähen und verschleißfesten Kunststoff oder dgl. besteht. Die Kernbuchse 27 ist gleichzeitig zu einem Kühlkörper 32 mit Kühlrippen 33 ausgestaltet. Die Anschlagscheibe 31 bildet einen Zentrieransatz 31a, eine Anschlagfläche 31b, die selbstverständlich im Toleranzabstand zur Stirn-Fläche 29 steht. Die Anschlagscheibe 31 bildet ferner zwischen zwei Rippen 27a jeweils eine Ausnehmung 31c, durch die Anschlußkabel 34a bzw. 34b zu den Elektromagnetspulen 21 verlaufen (Fig. 3).2, the magnetic block 23 is drawn without the winding of the electromagnetic coils 21. The magnet block 23 has a base plate 24, which forms a ring 24a, on which the magnet yokes 22a and 22b are integrally formed, so that the base plate 24 (ring 24a) together with the magnet yokes 22a and 22b form a one-piece coil carrier 25 . Here, the base plate 24 is connected to a core bushing 27 by a press connection 26. The core bushing 27 forms a transition to a receiving collar 27b by means of ribs 27a. After connection to the coil carrier 25, the core bushing 27 is machined on the end face 28 or on the end face 29, if machining should not have already become unnecessary due to the manufacturing process (investment casting process, sintering process). A precise tolerance distance 30 arises during processing, the tolerance quality being simple and economical to maintain. On the core sleeve 27 is the stop disc 31, which consists of a tough and wear-resistant plastic or the like. The core bushing 27 is simultaneously configured to form a heat sink 32 with cooling fins 33. The stop disc 31 forms a centering projection 31a, a stop surface 31b, which is of course at a tolerance distance from the end face 29. The stop disk 31 also forms a recess 31c between two ribs 27a, through which connecting cables 34a and 34b run to the electromagnetic coils 21 (FIG. 3).

Eine andere Gestaltungsform einer Anschlagscheibe 35, die jedoch dieselben Funktionen und Eigenschaften der Anschlagscheibe (31) erfüllt, ist in Fig. 1 dargestellt, wobei die einzige Abänderung die Verlegung der Ausnehmungen 31c darstellt: Es sind andere Ausnehmungen 36 durch den Ring 24a und durch den Aufnahmekranz 27b vorgesehen. Sowohl die Ausnehmung 31c als auch die Ausnehmung 36 liegen jedoch innerhalb des großten Durchmessers des Matrixdruckkopfes.Another design of a stop disk 35, which, however, fulfills the same functions and properties of the stop disk (31), is shown in Fig. 1, the only differences tion represents the laying of the recesses 31c: There are other recesses 36 through the ring 24a and through the receiving collar 27b. However, both the recess 31c and the recess 36 lie within the largest diameter of the matrix print head.

In der Kernbuchse 27 bzw. der Anschlagscheibe 31 sind Durchgangslöcher 37 (Fig. 2 und 3) für Befestigungsschrauben 38 (Fig. 1) vorgesehen. Die Befestigungsschrauben 38 verbinden den Magnetblock 23 mit dem Anschlußgehäuse 5b.Through holes 37 (FIGS. 2 and 3) for fastening screws 38 (FIG. 1) are provided in the core bushing 27 or the stop disk 31. The fastening screws 38 connect the magnetic block 23 to the connection housing 5b.

Claims (6)

1. A matrix print head with printing wires (8) which can be operated to print selectively by means of an electromagnet coil (21) allocated to each printing wire (8) with magnetic hinged armatures (18) for the dot-wise formation of characters on a record carrier (3), with the printing wires (8) resting against the inner ends of the associated hinged armatures (18) and being mounted and guided in a forward part of the print head housing (5) and the magnetic hinged armatures (18) in the rear part of the print head housing (5), and with the electromagnet coils (21) being combined on a base plate (24) to form a magnet block (23) and the base plate (24) being connected to the print head housing (5), with the base plate (24) of the magnet block (23) together with the magnet yokes (22a and 22b) consisting of a one-piece coil holder (25) receiving the electromagnet coils (21), the coil holder (25) being connected to a coaxially aligned core bushing (27), the printing wires (8) extending away from the side of the magnetic hinged armatures (18) which is opposite the side of these hinged armatures (18) facing the base plate (24), and the point of rotation of the hinged armatures being located between the two hinged armature ends and on the respective inner pole arms (22b) of the magnet yokes (22a, 22b), characterised in that the coil holder (25) is rigidly connected to the core bushing (27), with the end face (28) of the core bushing (27) which faces the inner hinged armature ends lying at an exact tolerance distance (30) from the end face (29) of the magnet yokes (22a, 22b) due to subsequent machining, and that a stop disc (31) is arranged on the core bushing (27) centrally for the inner ends of the magnetic hinged armatures (18) in such a manner that its stop surface (31 b) is at a tolerance distance from the end face (29) of the magnet yokes (22a, 22b).
2. A matrix print head according to Claim 1, characterised in that the base plate (24) of the magnet block (23) has a ring (24a) forming a base, on which ring the magnet yokes (22a, 22b) are formed in one piece and from the same material in a lost wax moulding process or in a sintering process.
3. A matrix print head according to Claim 2, characterised in that the one-piece coil holder (25) consists of an iron-silicon alloy.
4. A matrix print head according to Claims 1 to 3, characterised in that the coil holder (25) is riveted to the core bushing (27).
5. A matrix print head according to one or more of Claims 1 to 4, characterised in that the stop disc (31) covers in heat-insulating manner an end face (28) of the core bushing (27) facing the printing wire housing (5a) which is made of a plastics material as a damping stop means for the backward movement of the magnetic hinged armatures (18).
6. A matrix print head according to Claim 5, characterised in that the heat-insulating stop disc (31) damping the movements of the magnetic hinged armatures (18) is provided with recesses (31c) for connection cables (34a or 34b) to the electromagnet coils (21).
EP85730036A 1984-04-03 1985-03-05 Matrix print head Expired - Lifetime EP0157727B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85730036T ATE56182T1 (en) 1984-04-03 1985-03-05 MATRIX PRINT HEAD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3412855 1984-04-03
DE19843412855 DE3412855A1 (en) 1984-04-03 1984-04-03 MATRIX PRINT HEAD

Publications (3)

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EP0157727A2 EP0157727A2 (en) 1985-10-09
EP0157727A3 EP0157727A3 (en) 1986-12-30
EP0157727B1 true EP0157727B1 (en) 1990-09-05

Family

ID=6232783

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85730036A Expired - Lifetime EP0157727B1 (en) 1984-04-03 1985-03-05 Matrix print head

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EP (1) EP0157727B1 (en)
JP (1) JPS60225764A (en)
AT (1) ATE56182T1 (en)
DE (2) DE3412855A1 (en)

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CN104553346A (en) * 2013-10-21 2015-04-29 大连中盈科技有限公司 Needle printer printing head capable of continuously printing

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DE3540761A1 (en) * 1985-11-16 1987-05-21 Mannesmann Ag MATRIX PRINT HEAD
DE3889662D1 (en) * 1988-12-01 1994-06-23 Mannesmann Ag Folding anchor type matrix needle printhead.
US5163759A (en) * 1990-10-10 1992-11-17 Brady Usa, Inc. Signmaking machine using character forming tool for overlapping impacts and web scoring
US5865544A (en) * 1997-04-18 1999-02-02 Panini S.P.A. Dot-matrix print head, in particular for magnetic ink printers
CN102744975B (en) * 2011-04-22 2014-12-03 多美科信息科技（深圳）有限公司 Printing head

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CN104553346A (en) * 2013-10-21 2015-04-29 大连中盈科技有限公司 Needle printer printing head capable of continuously printing

Also Published As

Publication number Publication date
DE3412855C2 (en) 1991-06-13
DE3412855A1 (en) 1985-10-03
EP0157727A2 (en) 1985-10-09
JPS60225764A (en) 1985-11-11
EP0157727A3 (en) 1986-12-30
DE3579487D1 (en) 1990-10-11
JPH0481513B2 (en) 1992-12-24
ATE56182T1 (en) 1990-09-15

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