EP0358833A1 - Method of manufacturing an armature assembly for wire matrix print heads of the flap armature type - Google Patents

Method of manufacturing an armature assembly for wire matrix print heads of the flap armature type Download PDF

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Publication number
EP0358833A1
EP0358833A1 EP88730171A EP88730171A EP0358833A1 EP 0358833 A1 EP0358833 A1 EP 0358833A1 EP 88730171 A EP88730171 A EP 88730171A EP 88730171 A EP88730171 A EP 88730171A EP 0358833 A1 EP0358833 A1 EP 0358833A1
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EP
European Patent Office
Prior art keywords
armature
anchor
cutting
round
arms
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
EP88730171A
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German (de)
French (fr)
Other versions
EP0358833B1 (en
Inventor
Bernd Dipl.-Ing. Gugel (Fh)
Johannes Dipl.-Ing. Stempfle (Fh)
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Vodafone GmbH
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Mannesmann AG
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Filing date
Publication date
Application filed by Mannesmann AG filed Critical Mannesmann AG
Priority to DE8888730171T priority Critical patent/DE3871391D1/en
Priority to AT88730171T priority patent/ATE76357T1/en
Priority to EP88730171A priority patent/EP0358833B1/en
Priority to JP1178892A priority patent/JPH0274354A/en
Priority to US07/387,501 priority patent/US5175922A/en
Publication of EP0358833A1 publication Critical patent/EP0358833A1/en
Application granted granted Critical
Publication of EP0358833B1 publication Critical patent/EP0358833B1/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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
    • B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
    • B41J2/235—Print head assemblies
    • B41J2/24—Print head assemblies serial printer type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49105—Switch making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49204—Contact or terminal manufacturing
    • Y10T29/49208—Contact or terminal manufacturing by assembling plural parts
    • Y10T29/49222—Contact or terminal manufacturing by assembling plural parts forming array of contacts or terminals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49789—Obtaining plural product pieces from unitary workpiece
    • Y10T29/49796—Coacting pieces

Definitions

  • the invention relates to a method for producing an armature assembly for matrix printheads of the hinged armature type, as well as the armature assembly itself, in which prefabricated parts are jointly processed after their connection by thermal cutting or water jet cutting, wherein after cutting elongated armature with one in the operating position over a magnetic core Electromagnetic coil lying radially outer, wide armature arms and adjoining this, actuating a pressure element, radially inner, narrower armature arms are formed.
  • the arrangement of the magnet system in the case of matrix printheads of the hinged armature type differs in that the pressure element (the pressure needle), which rests against an armature, is moved by spring force into the rear rest position.
  • the electromagnet therefore counteracts the spring force.
  • the anchors are with Equipped with individual springs.
  • the assignment of an armature with a single spring to an electromagnetic coil means complicated, costly assembly, which is subject to the uncertainty of positional deviations.
  • different driving forces, different paths and different movement distances are often the cause of an uneven dot print and a lower frequency in the case of matrix printheads of the hinged anchor type.
  • the invention is based on the object, starting with the manufacturing process of an anchor assembly of the hinged anchor type, to reduce the manufacturing costs, to increase the accuracy of the assignment of anchors in matrix printheads of the hinged anchor type, to facilitate assembly and to save entire assembly steps.
  • the anchors being able to be produced in a filigree manner without having to be collected, transported, distributed and assembled individually later.
  • the thin shaped plate holds the anchors securely at a precise distance during their production and during operation, so that the entire armature assembly can be assembled in the form in which it is produced.
  • the narrow anchor arms are particularly low in mass, which allows an increase in the pressure needle frequency. Manufacture and handling of the anchors are improved. The manufacturing costs are reduced.
  • the positional accuracy of the anchors among themselves is very high.
  • This manufacturing accuracy can be further increased by attaching mounting holes for the pressure needles in the anchor round in one operation. This step can also be carried out before the anchor arms are cut out.
  • the separation of the individual armature arms can be done as a last step in that the radially outer armature arms are cut free after the flat, elastic ring-shaped sheet metal has been attached to the armature arm adjacent to the circumference.
  • the anchor assembly consisting of a pre-punched anchor plate and a sheet metal attached to the anchor plate, with the anchor plate and sheet metal lying on top of one another, gains new properties that also have a positive effect on the economy of handling, in particular internal transport and assembly. These properties are achieved by the molded sheet over the
  • the circumference of the armature circular web and radial projections which are adapted to the contours of the radially outer arm and the radially inner arm, form and are designed as a one-piece leaf spring.
  • the advantage of the webs running over the circumference of the armature blank is that of a joint, so that the armature can move individually during operation, but after manufacture and assembly form a coherent armature assembly together with the shaped plate.
  • the shaped plate can also be fastened to the anchor round by means of welding points.
  • Such welding spots are easy to attach due to the means used for thermal cutting. It is e.g. possible to use a laser beam one after the other for thermal cutting and welding the welding spots.
  • the anchor assembly consists of two parts, namely the anchor round 1 with the outer diameter 1 a and a prefabricated, ring-shaped, flat, elastic shaped plate 2.
  • the anchor round 1 will be in the area 3 between future radially outer ones Armature arms 4 and radially inner armature arms 5 are punched out with cutouts 6, with cutouts 7, which also take into account the radially outer armature arm 4, can also be punched out if these are not to be cut out later.
  • the prefabricated, ring-shaped, flat, elastic molded sheet 2 is placed on the anchor blank 1 punched out in this way and fastened on the anchor blank 1, which is still in one piece.
  • the shaped plate 2 has an outward radial extension 2a which partially covers the future radially outer armature arm 4 and an approximately triangular projection 2b which extends radially inward.
  • the outward extension 2a and the inward triangular projection 2b are in one piece with a full ring 2c and together form the shaped plate 2.
  • the anchor round 1 can also be punched out with a central, circular opening 1b if this is not to be cut out later.
  • the shaped plate 2 is fastened by welding points 8 and 9 (by means of laser beams) in such a way that the annular surface 10 partially covers the cutouts 6. Radially outer sections 6a and radially inner sections 6b of the cutout 6 each remain open.
  • the individual, radially inner and / or radially outer anchor arms 4 and 5 are cut out by laser cutting, spark erosion or water jet cutting, so that the anchor arms 4 and 5 are formed after cutting along the cutting lines 11 and 12.
  • mounting holes 13 can be done in one operation even before cutting on the cutting lines 11 and 12 by means of laser beams and the like. be drilled.
  • the radially outer anchor arms 4 can now, if this has not already been done when cutting free on the cutting lines 11 and 12, successively cut free adjacent to one another over the circumference, a gap 15 being formed in each case.
  • the shaped plate 2 has a central circumference (for example as shown)
  • Anchor round 1 extending web such as forms the ring 2c and radial projections are provided, which are adapted to the contours of the radially outer armature arm 4 and the radially inner armature arm 5.
  • These projections are identical or similar to the outward radial extension 2a or like the triangular projection 2b, but can in particular be kept longer.
  • the welding points 8 and 9 are to be attached, the welding points 8 and 9 being attached to the outermost outlines for the shaped plate 2.
  • the armature assembly produced by the method described above is installed as shown in FIG. 2.
  • the pressure needles 14 are mounted in a pressure needle guide housing 16 and brought together in a pressure needle guide 17 in front of a pressure abutment 18.
  • the pressure needle guide housing 16 also receives the armature assembly, which bears against an O-ring 19 on the one hand and against a damping ring 20.
  • the damping ring 20 is on one Coil carrier 21 mounted, the magnetic yoke legs 22 and 23 forms.
  • the outer magnetic yoke leg 22 carries the electromagnetic coil 24, which is in each case connected to an electrical circuit for actuating the electromagnetic coils 24 by means of a connection 25.
  • each armature 26 stands with a gap distance 27 to the end faces of the magnetic yoke legs 22 and 23.
  • each armature 26 lies flat on the end faces of the magnetic yoke legs 22 and 23 for a short time, and then immediately afterwards again in the to return to the drawn position.
  • each armature 26 is supported by a restoring force which is also present in the shaped plate 2.
  • springs 14 are assigned to the printing needles, as shown, for example, compression springs 28.
  • the matrix print head is then closed at the rear with a heat sink 29, and a screw 30 connects the printing needle guide housing 16 and the bobbin holder 21 to form a unit.

Abstract

A method of manufacturing an armature assembly for wire matrix print heads of the flap armature type is based on combining prefabricated parts (1, 2) and processing them jointly so that elongated armatures with broad armature arms (4) and narrower armature arms (5) are produced. <??>In order to reduce the manufacturing costs further, to increase the accuracy of the armature assignment, to facilitate the assembly and to save complete assembly stages, it is proposed that an armature circle (1) with open gaps (6) is punched out, then an annular elastic profiled sheet (2) is attached, covering the open gaps (6), and then the radially outer and radially inner armature arms (4, 5) are cut out without damaging the profiled sheet (2) by cutting (thermal cutting or water jet cutting). <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zum Herstellen einer Ankerbaugruppe für Matrixdruckköpfe der Klappankerbauart, sowie die Ankerbaugruppe selbst, bei dem vorgefertigte Teile nach deren Verbindung durch thermisches Schneiden bzw. Wasserstrahlschneiden gemeinsam bearbeitet werden, wobei nach dem Schneiden längliche Anker mit einem in Betriebsstellung über einem Magnetkern einer Elektromagnetspule liegende radial äußere, breite Ankerarme und an diese anschließende, ein Druckelement betätigende radial innere, schmalere Ankerarme gebildet werden.The invention relates to a method for producing an armature assembly for matrix printheads of the hinged armature type, as well as the armature assembly itself, in which prefabricated parts are jointly processed after their connection by thermal cutting or water jet cutting, wherein after cutting elongated armature with one in the operating position over a magnetic core Electromagnetic coil lying radially outer, wide armature arms and adjoining this, actuating a pressure element, radially inner, narrower armature arms are formed.

Ein solches Verfahren dient der wirtschaftlichen Hertstellung und zugleich der Steigerung der Genauigkeit, d.h. der ortsgenauen Anordnung von Ankern untereinander.Such a process serves the economic production and at the same time increases the accuracy, i.e. the precise arrangement of anchors with each other.

Stand der Technik ist ein Verfahren gemäß der DE-C2-35 02 472. Diese bekannte Lösung betrifft ein Verfahren zum Herstellen einer Ankerbaugruppe für ein sogenanntes vorgespanntes Magnetsystem. Bei einem vorgespannten Magnetsystem ist einem Elektromagneten ein Dauermagnet zugeordnet. Die Anordnung und Ausbildung des Magnetsystems ist auf das Elektromagnet- Dauermagnet-System abgestimmt.State of the art is a method according to DE-C2-35 02 472. This known solution relates to a method for producing an armature assembly for a so-called pre-stressed magnet system. In the case of a preloaded magnet system, a permanent magnet is assigned to an electromagnet. The arrangement and design of the magnet system is matched to the electromagnet-permanent magnet system.

Die Anordnung des Magnetsystems bei Matrixdruckköpfen der Klappankerbauart unterscheidet sich demgegenüber darin, daß das Druckelement (die Drucknadel) an einem Anker anliegend durch Federkraft in die rückwärtige Ruheposition bewegt wird. Der Elektromagnet wirkt daher der Federkraft entgegen. Dementsprechend sind die Anker mit Einzelfedern ausgestattet.
Die Zuordnung eines Ankers mit Einzelfeder zu einer Elektromagnetspule bedeutet jedoch eine umständliche, kostspielige Montage, die mit der Unsicherheit von Lageabweichungen behaftet ist. Unterschiedliche Antriebskräfte, unterschiedliche Wege und unterschiedliche Bewegungsabstände sind jedoch häufig die Ursache für einen ungleichen Punktabdruck und einer niederen Frequenz bei Matrixdruckköpfen der Klappankerbauart.The arrangement of the magnet system in the case of matrix printheads of the hinged armature type differs in that the pressure element (the pressure needle), which rests against an armature, is moved by spring force into the rear rest position. The electromagnet therefore counteracts the spring force. Accordingly, the anchors are with Equipped with individual springs.
However, the assignment of an armature with a single spring to an electromagnetic coil means complicated, costly assembly, which is subject to the uncertainty of positional deviations. However, different driving forces, different paths and different movement distances are often the cause of an uneven dot print and a lower frequency in the case of matrix printheads of the hinged anchor type.

Der Erfindung liegt die Aufgabe zugrunde, beginnend mit dem Herstellverfahren einer Ankerbaugruppe der Klappankerbauart die Herstellkosten zu senken, die Genauigkeit der Zuordnung von Ankern in Matrixdruckköpfen der Klappankerbauart zu steigern, die Montage zu erleichtern und ganze Montageschritte einzusparen.The invention is based on the object, starting with the manufacturing process of an anchor assembly of the hinged anchor type, to reduce the manufacturing costs, to increase the accuracy of the assignment of anchors in matrix printheads of the hinged anchor type, to facilitate assembly and to save entire assembly steps.

Die gestellte Aufgabe wird auf der Grundlage des eingangs bezeichneten Verfahrens erfindungsgemäß durch folgende Verfahrensschritte gelöst:

  • a) es wird eine Ankerronde mit im Bereich zwischen radial äußeren und radial inneren Ankerarmen angeordneten Freisparungen ausgestanzt,
  • b) danach wird ein vorgefertigtes, ringförmiges, flaches elastisches Formblech auf der noch einstückigen Ankerronde mit einer Ringfläche die Freisparungen überdeckend befestigt, und
  • c) danach werden die einzelnen, radial inneren und/oder radial äußeren Ankerarme durch Schneiden herausgeschnitten, ohne das flache, elastische Formblech zu durchtrennen.
The task is solved on the basis of the method described in the introduction by the following method steps:
  • a) an anchor blank is punched out with recesses arranged in the area between radially outer and radially inner anchor arms,
  • b) then a prefabricated, annular, flat elastic molded sheet is attached to the still one-piece anchor round with an annular surface covering the cutouts, and
  • c) then the individual, radially inner and / or radially outer anchor arms are cut out by cutting without cutting through the flat, elastic shaped plate.

Als Ergebnis liegt ein mit der Fertigungsgenauigkeit der Herstellmaschine erzeugter Ring aus abstandsgenau angeordneten Ankern vor, wobei die Anker filigranartig dünn hergestellt werden können, ohne einzeln später gesammelt, transportiert, verteilt und montiert werden zu müssen. Das dünne Formblech hält die Anker während ihrer Erzeugung und im Betrieb auf genauen Abstand sicher fest, so daß die gesamte Ankerbaugruppe in der Form ihrer Erzeugung montiert werden kann. Hierbei sind die schmalen Ankerarme besonders massearm, was eine Steigerung der Drucknadelfrequenz erlaubt. Herstellung und Handhabung der Anker werden verbessert. Die Herstellkosten werden gesenkt. Die Lagegenauigkeit der Anker untereinander ist sehr hoch.As a result, there is a ring made with the manufacturing accuracy of the manufacturing machine from precisely spaced anchors, the anchors being able to be produced in a filigree manner without having to be collected, transported, distributed and assembled individually later. The thin shaped plate holds the anchors securely at a precise distance during their production and during operation, so that the entire armature assembly can be assembled in the form in which it is produced. Here, the narrow anchor arms are particularly low in mass, which allows an increase in the pressure needle frequency. Manufacture and handling of the anchors are improved. The manufacturing costs are reduced. The positional accuracy of the anchors among themselves is very high.

Diese Herstellgenauigkeit kann noch dadurch gesteigert werden, indem Befestigungsbohrungen für die Drucknadeln in der Ankerronde in einem Arbeitsgang angebracht werden. Auch dieser Arbeitsgang kann vor dem Ausschneiden der Ankerarme erfolgen.This manufacturing accuracy can be further increased by attaching mounting holes for the pressure needles in the anchor round in one operation. This step can also be carried out before the anchor arms are cut out.

Das Trennen der einzelnen Ankerarme kann als letzter Arbeitsgang dadurch geschehen, daß die radial äußeren Ankerarme nach dem Befestigen des flachen, elastischen ringförmigen Formblechs zu dem jeweils über den Umfang angrenzenden Ankerarm freigeschnitten werden.The separation of the individual armature arms can be done as a last step in that the radially outer armature arms are cut free after the flat, elastic ring-shaped sheet metal has been attached to the armature arm adjacent to the circumference.

Die Ankerbaugruppe, bestehend aus einer vorgestanzten Ankerronde und einem auf der Ankerronde befestigten Formblech, wobei Ankerronde und Formblech in Scheibenform aufeinander liegen, gewinnt neue Eigenschaften, die sich ebenfalls positiv auf Wirtschaftlichkeit der Handhabung, insbesondere des innerbetrieblichen Transports und der Montage, auswirken. Diese Eigenschaften werden dadurch erzielt, indem das Formblech einen über den Umfang der Ankerronde verlaufenden Steg und jeweils radiale Vorsprünge, die den Umrissen des radial äußeren Ankerarmes und des radial inneren Ankerarmes angepaßt sind, bilden und als eine einstücke Blattfeder ausgeführt ist. Der Vorteil der über den Umfang der Ankerronde verlaufenden Stege ist der eines Gelenkes, so daß sich die Anker während des Betriebes zwar einzeln bewegen können, jedoch nach Herstellung und Montage zusammen mit dem Formblech eine zusammenhängende Ankerbaugruppe bilden.The anchor assembly, consisting of a pre-punched anchor plate and a sheet metal attached to the anchor plate, with the anchor plate and sheet metal lying on top of one another, gains new properties that also have a positive effect on the economy of handling, in particular internal transport and assembly. These properties are achieved by the molded sheet over the The circumference of the armature circular web and radial projections, which are adapted to the contours of the radially outer arm and the radially inner arm, form and are designed as a one-piece leaf spring. The advantage of the webs running over the circumference of the armature blank is that of a joint, so that the armature can move individually during operation, but after manufacture and assembly form a coherent armature assembly together with the shaped plate.

Vorteilhafterweise kann ferner das Formblech mittels Schweißpunkten auf der Ankerronde befestigt sein. Solche Schweißpunkte lassen sich aufgrund der für das thermische Schneiden benutzten Mittel leicht anbringen. Es ist z.B. möglich, einen Laserstrahl nacheinander zum thermischen Schneiden und zum Schweißen der Schweißpunkte anzuwenden.Advantageously, the shaped plate can also be fastened to the anchor round by means of welding points. Such welding spots are easy to attach due to the means used for thermal cutting. It is e.g. possible to use a laser beam one after the other for thermal cutting and welding the welding spots.

In der Zeichnung sind Ausführungsbeispiele für das Herstellverfahren sowie für die Gestaltung eines Matrixdruckkopfes mit der nach dem Herstellverfahren erzeugten Ankerbaugruppe dargestellt und werden nachfolgend näher erläutert. Es zeigen:

  • Fig. 1 eine Draufsicht auf Ankerronde und Formblech teils während und teils nach dem Ausschneiden und
  • Fig. 2 einen Querschnitt in Längsrichtung durch einen Matrixdruckkopf der Klappankerbauart.
The drawing shows exemplary embodiments for the production process and for the design of a matrix print head with the armature assembly produced according to the production process and are explained in more detail below. Show it:
  • Fig. 1 is a plan view of anchor round and shaped sheet partly during and partly after cutting and
  • Fig. 2 shows a cross section in the longitudinal direction through a matrix printhead of the hinged anchor type.

Die Ankerbaugruppe besteht aus zwei Teilen, nämlich der Ankerronde 1 mit dem Außendurchmesser 1a und aus einem vorgefertigten, ringförmigen, flachen, elastischen Formblech 2.The anchor assembly consists of two parts, namely the anchor round 1 with the outer diameter 1 a and a prefabricated, ring-shaped, flat, elastic shaped plate 2.

Die Ankerronde 1 wird mit im Bereich 3 zwischen zukünftig radial äußeren Ankerarmen 4 und radial inneren Ankerarmen 5 mit Freisparungen 6 ausgestanzt, wobei auch bereits den radial äußeren Ankerarm 4 jeweils berücksichtigende Ausschnitte 7 mit ausgestanzt werden können, falls diese nicht später mit ausgeschnitten werden sollen.The anchor round 1 will be in the area 3 between future radially outer ones Armature arms 4 and radially inner armature arms 5 are punched out with cutouts 6, with cutouts 7, which also take into account the radially outer armature arm 4, can also be punched out if these are not to be cut out later.

Auf die derart ausgestanzte Ankerronde 1 wird das vorgefertigte, ringförmige, flache, elastische Formblech 2 auf die noch einstückige Ankerronde 1 gelegt und befestigt. Hierzu weist das Formblech 2 eine den zukünftig radial äußeren Ankerarm 4 jeweils teilweise abdeckende, nach außen radiale Erstreckung 2a auf und einen etwa dreieckförmigen Vorsprung 2b, der sich radial nach innen erstreckt. Die nach außen gerichtete Erstreckung 2a und der nach innen gerichtete dreieckförmige Vorsprung 2b sind einstückig mit einem vollen Ring 2c und bilden insgesamt das Formblech 2.The prefabricated, ring-shaped, flat, elastic molded sheet 2 is placed on the anchor blank 1 punched out in this way and fastened on the anchor blank 1, which is still in one piece. For this purpose, the shaped plate 2 has an outward radial extension 2a which partially covers the future radially outer armature arm 4 and an approximately triangular projection 2b which extends radially inward. The outward extension 2a and the inward triangular projection 2b are in one piece with a full ring 2c and together form the shaped plate 2.

Die Ankerronde 1 kann auch noch mit einer zentrischen, kreisrunden Öffnung 1b ausgestanzt werden, falls diese nicht später mit ausgeschnitten werden soll.The anchor round 1 can also be punched out with a central, circular opening 1b if this is not to be cut out later.

Das Formblech 2 wird derart durch Schweißpunkte 8 und 9 (mittels Laserstrahlen) befestigt, daß die Ringfläche 10 die Freisparungen 6 teilweise überdeckt. Hierbei bleiben radial äußere Abschnitte 6a und radial innere Abschnitte 6b der Freisparung 6 jeweils offen.The shaped plate 2 is fastened by welding points 8 and 9 (by means of laser beams) in such a way that the annular surface 10 partially covers the cutouts 6. Radially outer sections 6a and radially inner sections 6b of the cutout 6 each remain open.

Danach werden in einem dritten Verfahrensschritt die einzelnen, radial inneren und/oder radial äußeren Ankerarme 4 und 5 durch Laserschneiden, Funkenerodieren oder Wasserstrahlschneiden herausgeschnitten, so daß nach dem Entlangschneiden auf den Schnittlinien 11 und 12 die Ankerarme 4 und 5 entstehen.Then, in a third process step, the individual, radially inner and / or radially outer anchor arms 4 and 5 are cut out by laser cutting, spark erosion or water jet cutting, so that the anchor arms 4 and 5 are formed after cutting along the cutting lines 11 and 12.

Für den Fall, daß die Bauweise des Matrixdruckkopfes gemäß Fig. 2 Befestigungsbohrungen 13 für Drucknadeln 14 erfordern sollte, können solche Befestigungsbohrungen 13 in einem Arbeitsgang auch vor dem Ausschneiden auf den Schnittlinien 11 und 12 mittels Laserstrahlen u.dgl. gebohrt werden.In the event that the construction of the matrix print head according to FIG. 2 Should require mounting holes 13 for printing needles 14, such mounting holes 13 can be done in one operation even before cutting on the cutting lines 11 and 12 by means of laser beams and the like. be drilled.

Die radial äußeren Ankerarme 4 können nunmehr, falls dies nicht schon beim Freischneiden auf den Schnittlinien 11 und 12 geschehen ist, aufeinanderfolgend jeweils über den Umfang aneinandergrenzend freigeschnitten werden, wobei jeweils ein Spalt 15 entsteht.The radially outer anchor arms 4 can now, if this has not already been done when cutting free on the cutting lines 11 and 12, successively cut free adjacent to one another over the circumference, a gap 15 being formed in each case.

Für den Fall, daß der volle Ring 2c nicht nur als Gelenk zwischen zwei radial äußeren Ankerarmen 4 wirken soll, sondern falls zusätzliche Rückstellkräfte durch Torsionsmomente übertragen werden sollen, ist vorgesehen, daß das Formblech 2 einen über einen mittleren Umfang (z.B. wie gezeichnet) der Ankerronde 1 verlaufenden Steg, wie z.B. den Ring 2c bildet und jeweils radiale Vorsprünge, die den Umrissen des radial äußeren Ankerarmes 4 und des radial inneren Ankerarmes 5 angepaßt sind, vorgesehen sind. Diese Vorsprünge sind gleich oder ähnlich wie die nach außen gerichtete radiale Erstreckung 2a oder wie der dreieckförmige Vorsprung 2b ausgestaltet, können jedoch insbesondere länger gehalten werden. In jedem Fall sind die Schweißpunkte 8 und 9 anzubringen, wobei für das Formblech 2 die Schweißpunkte 8 und 9 an den äußersten Umrissen angebracht sind.In the event that the full ring 2c should not only act as a joint between two radially outer anchor arms 4, but if additional restoring forces are to be transmitted by torsional moments, it is provided that the shaped plate 2 has a central circumference (for example as shown) Anchor round 1 extending web, such as forms the ring 2c and radial projections are provided, which are adapted to the contours of the radially outer armature arm 4 and the radially inner armature arm 5. These projections are identical or similar to the outward radial extension 2a or like the triangular projection 2b, but can in particular be kept longer. In any case, the welding points 8 and 9 are to be attached, the welding points 8 and 9 being attached to the outermost outlines for the shaped plate 2.

Die nach dem vorstehend beschriebenen Verfahren hergestellte Ankerbaugruppe wird gemäß Fig. 2 eingebaut. In einem Drucknadelführungsgehäuse 16 sind die Drucknadeln 14 gelagert und in einer Drucknadelführung 17 vor einem Druckwiderlager 18 zusammengeführt. Das Drucknadelführungsgehäuse 16 nimmt auch die Ankerbaugruppe auf, wobei diese gegen einen O-Ring 19 einerseits und gegen einen Dämpfungsring 20 anliegt. Hierbei ist der Dämpfungsring 20 an einem Spulenträger 21 gelagert, der Magnetjochschenkel 22 und 23 bildet. Der äußere Magnetjochschenkel 22 trägt die Elektromagnetspule 24, die jeweils mittels eines Anschlusses 25 an eine elektrische Schaltung zur Betätigung der Elektromagnetspulen 24 angeschlossen ist. Die Ankerbaugruppe liegt wie gezeichnet in der zurückgezogenen Position, d.h. die Drucknadeln 14 sind in Wartestellung. In dieser Position steht jeder Anker 26 mit einem Spaltabstand 27 zu den Stirnseiten der Magnetjochschenkel 22 und 23. Im bestromten Zustand der Elektromagnetspule 24 liegt jeder Anker 26 kurze Zeit flach auf den Stirnseiten der Magnetjochschenkel 22 und 23 auf, um danach sofort anschließend wieder in die gezeichnete Position zurückzukehren. Hierbei wird jeder Anker 26 durch eine auch im Formblech 2 vorhandene Rückstellkraft unterstützt. Zusätzlich sind den Drucknadeln 14 Federn zugeordnet wie gezeichnet z.B. Druckfedern 28. Der Matrixdruckkopf ist dann noch an seiner Rückseite mit einem Kühlkörper 29 abgeschlossen, und eine Schraube 30 verbindet das Drucknadelführungsgehäuse 16 und den Spulenträger 21 zu einer Einheit.The armature assembly produced by the method described above is installed as shown in FIG. 2. The pressure needles 14 are mounted in a pressure needle guide housing 16 and brought together in a pressure needle guide 17 in front of a pressure abutment 18. The pressure needle guide housing 16 also receives the armature assembly, which bears against an O-ring 19 on the one hand and against a damping ring 20. Here, the damping ring 20 is on one Coil carrier 21 mounted, the magnetic yoke legs 22 and 23 forms. The outer magnetic yoke leg 22 carries the electromagnetic coil 24, which is in each case connected to an electrical circuit for actuating the electromagnetic coils 24 by means of a connection 25. As shown, the armature assembly is in the retracted position, ie the printing needles 14 are in the waiting position. In this position, each armature 26 stands with a gap distance 27 to the end faces of the magnetic yoke legs 22 and 23. When the solenoid coil 24 is energized, each armature 26 lies flat on the end faces of the magnetic yoke legs 22 and 23 for a short time, and then immediately afterwards again in the to return to the drawn position. Here, each armature 26 is supported by a restoring force which is also present in the shaped plate 2. In addition, springs 14 are assigned to the printing needles, as shown, for example, compression springs 28. The matrix print head is then closed at the rear with a heat sink 29, and a screw 30 connects the printing needle guide housing 16 and the bobbin holder 21 to form a unit.

Claims (5)

1. Verfahren zum Herstellen einer Ankerbaugruppe für Matrixdruckköpfe der Klappankerbauart, bei dem vorgefertigte Teile nach deren Verbinden durch thermisches Schneiden bzw. Wasserstrahlschneiden gemeinsam bearbeitet werden, wobei nach dem Schneiden längliche Anker mit einem in Betriebsstellung über einem Magnetkern einer Elektromagnetspule liegende radial äußere, breite Ankerarme und an diese anschließende, ein Druckelement betätigende radial innere, schmalere Ankerarme gebildet werden,
gekennzeichnet durch folgende Verfahrensschritte: a) es wird eine Ankerronde mit im Bereich zwischen radial äußeren und radial inneren Ankerarmen angeordneten Freisparungen ausgestanzt, b) danach wird ein vorgefertigtes, ringförmiges, flaches elastisches Formblech auf der noch einstückigen Ankerronde, mit einer Ringfläche die Freisparungen überdeckend befestigt und c) danach werden die einzelnen, radial inneren und/oder radial äußeren Ankerarme durch Schneiden herausgeschnitten, ohne das flache, elastische Formblech zu durchtrennen. 1. A method for producing an armature assembly for matrix printheads of the hinged armature type, in which prefabricated parts are jointly processed after their connection by thermal cutting or water jet cutting, wherein after cutting elongated armatures with a radially outer, wide armature arm lying in the operating position over a magnetic core of an electromagnetic coil and to this adjoining, radially inner, narrower anchor arms actuating a pressure element are formed,
characterized by the following process steps: a) an anchor blank is punched out with recesses arranged in the area between radially outer and radially inner anchor arms, b) then a prefabricated, ring-shaped, flat elastic molded sheet is attached to the still one-piece anchor round, with an annular surface covering the cutouts and c) then the individual, radially inner and / or radially outer anchor arms are cut out by cutting without cutting through the flat, elastic shaped plate. 2. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß Befestigungsbohrungen (13) für die Drucknadeln (14) in der Ankerronde (1) in einem Arbeitsgang angebracht werden.2. The method according to claim 1,
characterized,
that mounting holes (13) for the pressure needles (14) in the anchor round (1) are made in one operation. 3. Verfahren nach den Ansprüchen 1 und 2,
dadurch gekennzeichnet,
daß die radial äußeren Ankerarme (4) nach dem Befestigen des flachen elastischen ringförmigen Formblechs (2) zu dem jeweils über den Umfang angrenzenden Ankerarm (4) freigeschnitten werden.3. The method according to claims 1 and 2,
characterized,
that the radially outer armature arms (4) are cut free after fastening the flat elastic annular shaped plate (2) to the armature arm (4) which is adjacent over the circumference. 4. Ankerbaugruppe, bestehend aus einer vorgestanzten Ankerronde (1) und einem auf der Ankerronde (1) befestigten Formblech (2), wobei Ankerronde (1) und Formblech (2) in Scheibenform aufeinanderliegen,
dadurch gekennzeichnet,
daß das Formblech einen über einem mittleren Umfang der Ronde (1) verlaufenden Steg und jeweils radiale Vorsprünge, die den Umrissen des radial äußeren Ankerarmes (4) und des radial inneren Ankerarmes (5) angepaßt sind, bilden und als eine einstückige Blattfeder ausgeführt ist.4. Anchor assembly, consisting of a pre-punched anchor round (1) and a shaped plate (2) fastened on the anchor round (1), wherein round plate (1) and shaped plate (2) lie in disc form,
characterized,
that the shaped sheet forms a web running over a central circumference of the round blank (1) and radial projections, which are adapted to the contours of the radially outer armature arm (4) and the radially inner armature arm (5), and is designed as a one-piece leaf spring. 5. Ankerbaugruppe nach Anspruch 5,
dadurch gekennzeichnet,
daß das Formblech (2) mittels Schweißpunkten (8,9) auf der Ankerronde (1) befestigt ist.5. armature assembly according to claim 5,
characterized,
that the shaped plate (2) is fixed by means of welding spots (8,9) on the anchor round (1).
EP88730171A 1988-08-01 1988-08-01 Method of manufacturing an armature assembly for wire matrix print heads of the flap armature type Expired - Lifetime EP0358833B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE8888730171T DE3871391D1 (en) 1988-08-01 1988-08-01 METHOD FOR PRODUCING ANCHOR ASSEMBLY FOR MATRIX PRINT HEADS OF THE FOLDING ARMOR TYPE.
AT88730171T ATE76357T1 (en) 1988-08-01 1988-08-01 METHOD OF MANUFACTURING AN ARMATURE ASSEMBLY FOR MATRIX PRINT HEADS OF THE FLAP ANCHOR DESIGN.
EP88730171A EP0358833B1 (en) 1988-08-01 1988-08-01 Method of manufacturing an armature assembly for wire matrix print heads of the flap armature type
JP1178892A JPH0274354A (en) 1988-08-01 1989-07-11 Manufacture of armature component of flap armature type matrix printing head and armature component
US07/387,501 US5175922A (en) 1988-08-01 1989-07-28 Method for the manufacture of an armature assembly for matrix print heads of the hinged-clapper-armature construction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88730171A EP0358833B1 (en) 1988-08-01 1988-08-01 Method of manufacturing an armature assembly for wire matrix print heads of the flap armature type

Publications (2)

Publication Number Publication Date
EP0358833A1 true EP0358833A1 (en) 1990-03-21
EP0358833B1 EP0358833B1 (en) 1992-05-20

Family

ID=8200559

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88730171A Expired - Lifetime EP0358833B1 (en) 1988-08-01 1988-08-01 Method of manufacturing an armature assembly for wire matrix print heads of the flap armature type

Country Status (5)

Country Link
US (1) US5175922A (en)
EP (1) EP0358833B1 (en)
JP (1) JPH0274354A (en)
AT (1) ATE76357T1 (en)
DE (1) DE3871391D1 (en)

Cited By (1)

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EP0624475A2 (en) * 1993-05-13 1994-11-17 Canon Kabushiki Kaisha Ink tank, head cartridge and ink jet printing apparatus

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US5575932A (en) * 1994-05-13 1996-11-19 Performance Controls, Inc. Method of making densely-packed electrical conductors

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EP0009873A1 (en) * 1978-10-10 1980-04-16 Mannesmann Tally Corporation Segmented-ring magnet print head
US4204778A (en) * 1977-05-26 1980-05-27 Kabushiki Kaisha Suwa Seikosha Wire type dot printer head assembly
EP0138779A2 (en) * 1983-10-14 1985-04-24 Ing. C. Olivetti & C., S.p.A. Matrix printing device

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US4204778A (en) * 1977-05-26 1980-05-27 Kabushiki Kaisha Suwa Seikosha Wire type dot printer head assembly
EP0009873A1 (en) * 1978-10-10 1980-04-16 Mannesmann Tally Corporation Segmented-ring magnet print head
EP0138779A2 (en) * 1983-10-14 1985-04-24 Ing. C. Olivetti & C., S.p.A. Matrix printing device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0624475A2 (en) * 1993-05-13 1994-11-17 Canon Kabushiki Kaisha Ink tank, head cartridge and ink jet printing apparatus
EP0624475A3 (en) * 1993-05-13 1995-05-31 Canon Kk Ink tank, head cartridge and ink jet printing apparatus.
US6109742A (en) * 1993-05-13 2000-08-29 Canon Kabushiki Kaisha Ink tank, head cartridge and ink jet printing apparatus
US6325498B1 (en) 1993-05-13 2001-12-04 Canon Kabushiki Kaisha Ink tank with ink absorbing member

Also Published As

Publication number Publication date
DE3871391D1 (en) 1992-06-25
JPH0274354A (en) 1990-03-14
US5175922A (en) 1993-01-05
EP0358833B1 (en) 1992-05-20
ATE76357T1 (en) 1992-06-15

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