EP0026549A2 - Wire print head - Google Patents

Wire print head Download PDF

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Publication number
EP0026549A2
EP0026549A2 EP80200915A EP80200915A EP0026549A2 EP 0026549 A2 EP0026549 A2 EP 0026549A2 EP 80200915 A EP80200915 A EP 80200915A EP 80200915 A EP80200915 A EP 80200915A EP 0026549 A2 EP0026549 A2 EP 0026549A2
Authority
EP
European Patent Office
Prior art keywords
electromagnets
cradle
carrier
conical
supports
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
EP80200915A
Other languages
German (de)
French (fr)
Other versions
EP0026549B1 (en
EP0026549A3 (en
Inventor
Wendelin Weber
Burkhard Goerke
Peter Engler
Heinrich Dürr
Hermann Richter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0026549A2 publication Critical patent/EP0026549A2/en
Publication of EP0026549A3 publication Critical patent/EP0026549A3/en
Application granted granted Critical
Publication of EP0026549B1 publication Critical patent/EP0026549B1/en
Expired 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
    • B41J2/285—Actuators for print wires of plunger 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

Definitions

  • the invention relates to a wire print head with cylindrical electromagnets arranged in a circle around a central axis and actuating the printing needles, which are mounted in cradle-shaped supports of a conical carrier.
  • Such a needle printhead is known from the magazine “Electronics", March 1977, page 54.
  • the electromagnets required to control the pressure elements are mounted in a metal support with cradle-shaped supports.
  • the electromagnets in this support are secured by the heads of screws which are screwed into the metal carrier between the neighboring electromagnets.
  • the invention has for its object a needle
  • the electromagnets can be arranged close to each other on the carrier and in which the vibrations and temperature fluctuations are insignificant for proper storage and securing of the electromagnets.
  • the supports are designed to be elastic, that the electromagnets are mounted under spring force in the cradle-shaped supports by clamping devices which are common to all electromagnets and hold them against the conical support, and in that each electromagnet prevents displacement in its Longitudinal direction is secured by two approaches, at least one of which is resilient.
  • the electromagnets of the needle printhead according to the invention are clamped between two approaches, at least one of which is elastic, and are additionally mounted on flexible supports, the vibrations and expansions which occur as a result of temperature fluctuations can be absorbed by the clamping force. Loosening of the electromagnets in their bearings or damage to the needle print head is avoided.
  • the electromagnets rest on a relatively large part of the supports.
  • the conical support has an undercut in the area of the electromagnet, which extends in the longitudinal direction of the support, the support can be made of relatively hard plastic without the elasticity of the cradle-shaped supports being impaired.
  • the position of the electromagnets can be adapted to the respective position of the envelope surface of the associated recesses by the cradle-shaped supports, which are flexible in all coordinates.
  • the electromagnet itself is compliant in all its coordinates, so that the contact area between the cylinder of the electromagnet and the clamping device is as large as possible. Good heat dissipation via the clamping device is also achieved as a result.
  • the conical carrier made of plastic for example made of a thermoplastic, is expediently reinforced by glass fibers.
  • glass fibers for example, Polyamide 6/6 with, for example, 30% glass fiber.
  • Polycarbonate is also suitable.
  • the approaches for clamping the electromagnets in the axial direction can be parts of the conical carrier.
  • the lugs, which are arranged near the cone tip of the conical carrier as a star-shaped metal spring which is connected to the holder, for example by screws or clamps, or is also embedded in the holder.
  • the front part 1 consists essentially of a front part 1, in which the guides for the printing needles 4 are located, and a rear part 2, in which the cylindrical electromagnets 5 for controlling the printing needles are arranged.
  • the electromagnets 5 are designed as plunger armature magnets, with the armature of which the printing needles 4 are firmly connected. Both parts 1 and 2 are mounted on the base plate 3 arranged between them.
  • the front part 1 has two bores 6 and 7, with which the needle print head is fixed in a known manner on a carriage, not shown.
  • the rear part 2 contains at least one conical carrier 8 on which the electromagnets 5 are arranged in a circle.
  • the conical support 8 is made of plastic, which is reinforced with glass fibers. Any plastic that can withstand higher temperatures without impairment is suitable.
  • the conical carrier 8 itself consists of a the central axis arranged central part 27, at one end of which the base part 28 connects.
  • This base part 28 has an axially aligned central approach, which is preferred so far that an undercut 30 is formed, and which carries the bearing parts 9 for the electromagnets 5 at its front ends.
  • the bearing parts are chamfered so that the support lines of the supports 24 and 25 for the electromagnets coincide with the cone surface lines a.
  • the undercut 30 enables the bearing part 9 and thus the support line to escape radially.
  • the base part 28 has star-shaped lugs 20, which serve as the one lugs for clamping the electromagnets 5.
  • the support 25 is arranged in the base part 28, the surface of which is adapted to the cylindrical shape of the electromagnet, but is held in such a way that a space s exists on all sides between the support 25 and the lateral surface of the electromagnet 5.
  • This gap s is necessary so that the electromagnet 5 can avoid the forces P (FIG. 4) which are exerted on the electromagnet when the clamping device 21, 22 is placed on it.
  • the outer surface of the electromagnet 5 is aligned with the recess 26 so that the outer surface of the electromagnet and the enveloping surface of the recess largely nestle against one another.
  • the electromagnet 5 can deflect in all coordinates due to the forces which occur, wherein it experiences a counterforce P1 only in the region of the supporting line of the resilient bearing part 9.
  • the electromagnets 5 are thereby fixed on the supports 24, 25 of the bearings designed in the manner of a cradle.
  • the number of resilient bearing parts 9 depends on the number of electromagnets 5 to be arranged on the conical carrier 8. In the present example six electromagnets are provided. If more electromagnets than are to be accommodated on the carrier are to be used, ie if the sign to be printed is to be created in the example by more than six printing needles, several conical carriers 8 of the same type can be arranged axially one behind the other. In Fig.1 two and in Fig.2 three carriers are arranged one behind the other. Each carrier 8 is rotated relative to the one in front by a slot division.
  • Each bearing part 9 is axially divided into two partial areas by a slot 11 reaching almost to the central axis 10. This ensures that the bearing part 9 is also formed tangentially resilient. Strong forces exerted centrally on the bearing can thus be absorbed.
  • metal springs 13 are arranged, which are designed in the form of a beam. Each beam of this metal spring 13 projects into the associated area of a bearing part 9. The shape of the metal spring 13 can be seen from Fig.5. After assembly, the slots 14 of the metal spring 13 overlap with the slots 11 of the brackets 8, so that the pressure needles can also be passed through the tension springs without hindrance. These metal springs 13 represent the resilient lugs 29 and 31, which are used to clamp the electromagnets 5.
  • the rear part 2 is assembled by first alternately mounting a carrier 8, then a metal spring 13 and again a carrier 8, etc. on a screw bolt 15 is threaded. Following the last metal spring 13, a spacer 16 is threaded. The screw bolt 15 is then screwed centrally onto the base plate 3 and secured.
  • the conical carrier 8 and the metal spring 13 are secured against rotation by a bolt 17 located on each carrier 8, which protrudes through a hole 18 in the metal spring 13 and engages in a hole (not shown in more detail) in the conical carrier 8 located behind it.
  • the electromagnets 5 with the pressure needles 4 are inserted.
  • the printing needles 4 are inserted into holes 19 of the base plate until the associated electromagnet 5 lies at the level of the associated bearing part 9.
  • the electromagnet 5 is pressed against the lugs 29 and 31 of the metal spring 13, which dodges, so that the electromagnet 5 can now be inserted into the bearing part 9.
  • the electromagnet 5 is then pressed by the force of the metal spring 13 against the fixed star-shaped projection 20 of the bearing part 9 and held on the bearing part 9.
  • the entire rear part 2 including brackets and electromagnets can be closed by two half-shells 21 and 22 of a clamping device, in which the recesses 26 are provided as counter bearings for the electromagnets 5. Only one of these half-shells is shown in FIG. Both half-shells can additionally be provided with cooling fins and have grooves 23 for holding a circuit board (not shown) for the electrical connections.

Abstract

Nadeldruckkopf (1,2) mit kreisförmig um eine Zentralachse angeordneten und die Drucknadeln (4) betätigenden zylindrischen Elektromagnete (5), die auf einem kegelförmigen Träger (8) durch Klemmvorrichtungen (21,22) eingespannt sind. Der Träger (8) enthält wiegenförmige nachgiebige Stützlager (24,25) für jeden der Elektromagnete (5). Durch die nachgiebigen Auflagen (24,25) werden die verschiedenen Ausdehnungen der Elektromagnete (5) durch Erschütterungen und Temperaturschwankungen kompensiert. Die Nachgiebigkeit der der Stützauflagen (24,25) wird durch Schlitze (11,12) im Träger (8) erreicht, die gleichzeitig die Anordnung mehrerer Träger (8) im gleichen Druckkopf hintereinander ermöglichen.Needle print head (1, 2) with cylindrical electromagnets (5) arranged in a circle around a central axis and actuating the printing needles (4), which are clamped on a conical support (8) by clamping devices (21, 22). The carrier (8) contains cradle-shaped resilient support bearings (24, 25) for each of the electromagnets (5). The flexible extensions (24, 25) compensate for the various expansions of the electromagnets (5) due to vibrations and temperature fluctuations. The resilience of the support pads (24, 25) is achieved by means of slots (11, 12) in the support (8), which at the same time allow several supports (8) to be arranged in succession in the same print head.

Description

Die Erfindung betrifft einen Nadeldruckkopf mit kreisförmig um eine Zentralachse angeordneten und die Drucknadeln betätigenden zylindrischen Elektromagneten, die in wiegenförmigen Stützen eines kegelförmigen Trägers gelagert sind.The invention relates to a wire print head with cylindrical electromagnets arranged in a circle around a central axis and actuating the printing needles, which are mounted in cradle-shaped supports of a conical carrier.

Ein derartiger Nadeldruckkopf ist aus der Zeitschrift "Electronics", März 1977, Seite 54 bekannt. Die zur Steuerung der Druckelemente benötigten Elektromagnete sind in einem Metallträger gelagert, der wiegenförmige Stützen aufweist. Die Sicherung der Elektromagnete in diesem Stützen erfolgt durch die Köpfe von Schrauben, die seitlich zwischen den benachbarten Elektromagneten in den Metallträger eingeschraubt werden.Such a needle printhead is known from the magazine "Electronics", March 1977, page 54. The electromagnets required to control the pressure elements are mounted in a metal support with cradle-shaped supports. The electromagnets in this support are secured by the heads of screws which are screwed into the metal carrier between the neighboring electromagnets.

Diese Befestigung der Elektromagnete ist keinesfalls zuverlässig. Eine einwandfreie Sicherung der Elektromagnete aber ist sehr wichtig, weil diese während des Betriebes des Druckers ständig Erschütterungen und Temperaturschwankungen unterliegen. Temperaturschwankungen führen zu unterschiedlichen Ausdehnungen von Elektromagnet, kegelförmigem Träger und Sicherheitsschraube. Bei einer an sich gegen die auftretenden Vibrationen wirksame starre Verbindung dieser Teile ist jedoch eine ausreichende Kompensation der Temperaturschwankungen nicht gegeben. Außerdem sind die einzelnen Elektromagnete wegen der zwischen ihnen befindlichen Sicherungsschrauben relativ weit nebeneinander auf dem Kegelmantel des Trägers angeordnet.This attachment of the electromagnets is by no means reliable. Proper securing of the electromagnets is very important, however, because they are constantly subject to shocks and temperature fluctuations during the operation of the printer. Temperature fluctuations lead to different expansions of the electromagnet, conical carrier and safety screw. In the case of a rigid connection of these parts that is effective against the vibrations that occur, however, there is no adequate compensation for the temperature fluctuations. In addition, because of the locking screws located between them, the individual electromagnets are arranged relatively far next to one another on the conical surface of the carrier.

Der Erfindung liegt die Aufgabe zugrunde, einen Nadeldruckkopf zu schaffen, dessen Elektromagnete eng nebeneinander auf dem Träger angeordnet werden können und bei dem die Vibrationen und die Temperaturschwankungen für eine einwandfreie Lagerung und Sicherung der Elektromagnete unbedeutend sind.The invention has for its object a needle To create printhead, the electromagnets can be arranged close to each other on the carrier and in which the vibrations and temperature fluctuations are insignificant for proper storage and securing of the electromagnets.

Diese Aufgabe wird dadurch gelöst, daß die Stützen elastisch ausgebildet sind, daß die Elektromagnete unter Federkraft in den wiegenförmigen Stützen durch Klemmvorrichtungen gelagert sind, die für alle Elektromagnete gemeinsam sind und diese gegen den kegelförmigen Träger halten, und daß jeder Elektromagnet gegen eine Verschiebung in seiner Längsrichtung durch zwei Ansätze gesichert ist, von denen mindestens einer federnd ausgebildet ist.This object is achieved in that the supports are designed to be elastic, that the electromagnets are mounted under spring force in the cradle-shaped supports by clamping devices which are common to all electromagnets and hold them against the conical support, and in that each electromagnet prevents displacement in its Longitudinal direction is secured by two approaches, at least one of which is resilient.

Dadurch, daß die Elektromagnete des Nadeldruckkopfes nach der Erfindung zwischen zwei Ansätzen eingespannt sind, von denen mindestens einer elastisch ausgebildet ist, und zusätzlich auf nachgiebigen Stützen gelagert sind, können die auftretenden Vibrationen und Ausdehnungen infolge von Temperaturschwankungen durch die Einspannkraft abgefangen werden. Eine Lockerung der Elektromagnete in ihren Lagern oder eine Schädigung des Nadeldruckkopfes wird vermieden.Characterized in that the electromagnets of the needle printhead according to the invention are clamped between two approaches, at least one of which is elastic, and are additionally mounted on flexible supports, the vibrations and expansions which occur as a result of temperature fluctuations can be absorbed by the clamping force. Loosening of the electromagnets in their bearings or damage to the needle print head is avoided.

Bei dem Nadeldruckkopf gemäß der Erfindung liegen die Elektromagnete auf einem relativ großen Teil der Stützen auf. Außerdem ist es möglich, mehrere kegelförmige Träger hintereinander anzuordnen. Dies wird dadurch erreicht, daß der kegelförmige Träger aus Kunststoff besteht, daß die wiegenförmigen Stützen durch einen Schlitz voneinander getrenntj3:ind, der sich in Längsrichtung des zugeordneten Elektromagneten erstreckt, und daß ein weiterer Schlitz in Längsrichtung der Elektromagnete zwischen den wiegenförmigen Stützen benachbarter Elektromagnete vorgesehen ist.In the needle print head according to the invention, the electromagnets rest on a relatively large part of the supports. In addition, it is possible to arrange several conical supports one behind the other. This is achieved in that the conical support is made of plastic, that the cradle-shaped supports are separated from one another by a slot j 3 : ind, which extends in the longitudinal direction of the associated electromagnet, and in that a further slot in the longitudinal direction of the electromagnets between the cradle-shaped supports of adjacent electromagnets in front is seen.

Da gemäß weiterer Ausbildung der Erfindung der kegelförmige Träger im Gebiet der Elektromagnete eine Unterschneidung besitzt, die sich in Längsrichtung des Trägers erstreckt, kann der Träger aus relativ hartem Kunststoff hergestellt werden, ohne daß die Elastizität der wiegenförmigen Stützen beeinträchtigt wird.Since, according to a further embodiment of the invention, the conical support has an undercut in the area of the electromagnet, which extends in the longitudinal direction of the support, the support can be made of relatively hard plastic without the elasticity of the cradle-shaped supports being impaired.

Das wesentliche der Erfindung ist somit darin zu sehen, daß die Lage der Elektromagneten durch die in allen Koordinaten nachgiebigen wiegenförmigen Stützen der jeweiligen Lage der Hüllfläche der zugeordneten Ausnehmungen angepaßt werden kann. Hierdurch ist auch der Elektromagnet selbst in allen seinen Koordinaten nachgiebig, so daß die Berührungsfläche zwischen dem Zylinder des Elektromagneten und der Klemmvorrichtung so groß wie möglich wird. Eine gute Wärmeabführung über die Klemmvorrichtung ist dadurch ebenfalls erreicht.The essence of the invention is thus to be seen in the fact that the position of the electromagnets can be adapted to the respective position of the envelope surface of the associated recesses by the cradle-shaped supports, which are flexible in all coordinates. As a result, the electromagnet itself is compliant in all its coordinates, so that the contact area between the cylinder of the electromagnet and the clamping device is as large as possible. Good heat dissipation via the clamping device is also achieved as a result.

Der kegelförmige Träger aus Kunststoff, beispielsweise aus einem Thermoplast, wird zweckmäßig durch Glasfasern verstärkt. Besonders geeignet ist z.B. Polyamid 6/6 mit beispielsweise 30 % Glasfaser. Auch Polycarbonat ist geeignet.The conical carrier made of plastic, for example made of a thermoplastic, is expediently reinforced by glass fibers. For example, Polyamide 6/6 with, for example, 30% glass fiber. Polycarbonate is also suitable.

Die Ansätze zum Einklemmen der Elektromagnete in axialer Richtung, die alle strahlenförmig nach außen weisen, können Teile des kegelförmigen Trägers sein. Es ist jedoch zweckmäßig, die Ansätze, die nahe der Kegelspitze des kegelförmigen Trägers angeordnet sind, als eine sternförmige Metallfeder auszubilden, die beispielsweise durch Schrauben oder Klemmen mit der Halterung verbunden ist oder auch in dieser eingebettet ist.The approaches for clamping the electromagnets in the axial direction, which all point radially outwards, can be parts of the conical carrier. However, it is expedient to design the lugs, which are arranged near the cone tip of the conical carrier, as a star-shaped metal spring which is connected to the holder, for example by screws or clamps, or is also embedded in the holder.

Die Erfindung wird anhand eines in den Zeichnungen dargestellten Ausführungsbeispieles näher erläutert. Es zeigen:

  • Fig.1 die perspektivische Ansicht eines Nadeldruckkopfes gemäß der Erfindung mit zwei hintereinander angeordneten kegelförmigen Trägern,
  • Fig.2 einen Schnitt durch einen Teil des Nadeldruckkopfes gemäß der Erfindung mit drei hintereinander angeordneten Trägern,
  • Fig.3 die Vorderansicht der Anordnung nach Fig.2,
  • Fig.4 eine Detailzeichnung der Anordnung vom kegelförmigen Träger, einem Elektromagneten und Teilen der Klemmvorrichtung und
  • Fig.5 eine strahlenartig ausgebildete Spannfeder.
The invention is illustrated by one in the drawings presented embodiment explained in more detail. Show it:
  • 1 shows the perspective view of a wire-dot print head according to the invention with two conical carriers arranged one behind the other,
  • 2 shows a section through part of the wire dot print head according to the invention with three carriers arranged one behind the other,
  • 3 shows the front view of the arrangement according to FIG. 2,
  • 4 shows a detailed drawing of the arrangement of the conical carrier, an electromagnet and parts of the clamping device and
  • Fig.5 is a radiation-like tension spring.

Der in Fig.1 dargestellte Nadeldruckkopf besteht im wesentlichen aus einem vorderen Teil 1, in welchem sich die Führungen für die Drucknadeln 4 befinden, und einem hinteren Teil 2, in welchem die zylindrischen Elektromagnete 5 zur Steuerung der Drucknadeln angeordnet sind. Die Elektromagnete 5 sind als Tauchankermagnete ausgebildet, mit deren Anker die Drucknadeln 4 fest verbunden sind. Beide Teile 1 und 2 sind auf der zwischen ihnen angeordneten Grundplatte 3 montiert. Der vordere Teil 1 besitzt zwei Bohrungen 6 und 7, mit denen der Nadeldruckkopf auf einem nicht dargestellten Wagen in bekannter Weise fixiert wird.1 consists essentially of a front part 1, in which the guides for the printing needles 4 are located, and a rear part 2, in which the cylindrical electromagnets 5 for controlling the printing needles are arranged. The electromagnets 5 are designed as plunger armature magnets, with the armature of which the printing needles 4 are firmly connected. Both parts 1 and 2 are mounted on the base plate 3 arranged between them. The front part 1 has two bores 6 and 7, with which the needle print head is fixed in a known manner on a carriage, not shown.

Der hintere Teil 2 enthält mindestens einen kegelförmigen Träger 8, auf dem die Elektromagnete 5 kreisförmig angeordnet sind. Der kegelförmige Träger 8 ist aus Kunststoff hergestellt, der mit Glasfasern verstärkt ist. Geeignet dazu ist jeder Kunststoff, der ohne Beeinträchtigung höhere Temperaturen aushalten kann.The rear part 2 contains at least one conical carrier 8 on which the electromagnets 5 are arranged in a circle. The conical support 8 is made of plastic, which is reinforced with glass fibers. Any plastic that can withstand higher temperatures without impairment is suitable.

Der kegelförmige Träger 8 selbst besteht aus einem um die Zentralachse angeordneten Mittelteil 27, an dessen einem Ende sich der Grundteil 28 anschließt. Dieser Grundteil 28 besitzt einen axial ausgerichteten zentrischen Ansatz, der soweit vorgezogen ist, daß eine Hinterschneidung 30 entsteht,und der an seinen vorderen Enden die Lagerteile 9 für die Elektromagneten 5 trägt. Die Lagerteile sind so abgeschrägt, daß die Stützlinien der Stützen 24 und 25 für die Elektromagnete mit den Kegelmantellinien a zusammenfallen. Durch die Hinterschneidung 30 wird ein Ausweichen des Lagerteiles 9 und damit der Stützlinie radial möglich. Weiterhin besitzt der Grundteil 28 sternförmige Ansätze 20, die als die einen Ansätze für das Einklemmen der Elektromagnete 5 dienen. Anschließend an diese Ansätze 20 ist im Grundteil 28 die Stütze 25 angeordnet, deren Oberfläche der zylindrischen Form der Elektromagneten angepaßt,aber so gehalten ist, daß zwischen der Stütze 25 und der Mantelfläche des Elektromagneten 5 allseits ein Zwischenraum s besteht. Dieser Zwischenraum s ist erforderlich, damit der Elektromagnet 5 den Kräften P (Fig.4) ausweichen kann die beim Aufsetzen der Klemmvorrichtung 21, 22 auf den Elektromagneten ausgeübt werden. Hierbei wird die Mantelfläche des Elektromagneten 5 an die Ausnehmung 26 ausgerichtet, so daß sich Mantelfläche des Elektromagneten und Hüllfläche der Ausnehmung weitgehend aneinanderschmiegen. Je nachdem welche Toleranzen vorliegen, kann der Elektromagnet 5 durch die auftretenden Kräfte in allen Koordinaten ausweichen, wobei er nur im Bereich der Stützlinie des federnden Lagerteiles 9 eine Gegenkraft P1 erfährt. Die Elektromagnete 5 liegen dadurch fest auf den Stützen 24, 25 der nach Art einer Wiege ausgebildeten Lager.The conical carrier 8 itself consists of a the central axis arranged central part 27, at one end of which the base part 28 connects. This base part 28 has an axially aligned central approach, which is preferred so far that an undercut 30 is formed, and which carries the bearing parts 9 for the electromagnets 5 at its front ends. The bearing parts are chamfered so that the support lines of the supports 24 and 25 for the electromagnets coincide with the cone surface lines a. The undercut 30 enables the bearing part 9 and thus the support line to escape radially. Furthermore, the base part 28 has star-shaped lugs 20, which serve as the one lugs for clamping the electromagnets 5. Subsequent to these approaches 20, the support 25 is arranged in the base part 28, the surface of which is adapted to the cylindrical shape of the electromagnet, but is held in such a way that a space s exists on all sides between the support 25 and the lateral surface of the electromagnet 5. This gap s is necessary so that the electromagnet 5 can avoid the forces P (FIG. 4) which are exerted on the electromagnet when the clamping device 21, 22 is placed on it. Here, the outer surface of the electromagnet 5 is aligned with the recess 26 so that the outer surface of the electromagnet and the enveloping surface of the recess largely nestle against one another. Depending on which tolerances are present, the electromagnet 5 can deflect in all coordinates due to the forces which occur, wherein it experiences a counterforce P1 only in the region of the supporting line of the resilient bearing part 9. The electromagnets 5 are thereby fixed on the supports 24, 25 of the bearings designed in the manner of a cradle.

Die Zahl der federnden Lagerteile 9 richtet sich nach der Anzahl der auf dem kegelförmigen Träger 8 anzuordnenden Elektromagnete 5. Im vorliegenden Beispiel sind sechs Elektromagnete vorgesehen. Sollen mehr Elektromagnete als auf dem Träger unterzubringen sind verwendet werden, d.h. soll das abzudruckende Zeichen im Beispiel durch mehr als sechs Drucknadeln erstellt werden, so können mehrere gleichartige kegelförmige Träger 8 axial hintereinander angeordnet werden. In Fig.1 sind zwei und in Fig.2 drei Träger hintereinander angeordnet. Jeder Träger 8 ist dabei gegenüber dem davorliegenden um eine Schlitzteilung verdreht.The number of resilient bearing parts 9 depends on the number of electromagnets 5 to be arranged on the conical carrier 8. In the present example six electromagnets are provided. If more electromagnets than are to be accommodated on the carrier are to be used, ie if the sign to be printed is to be created in the example by more than six printing needles, several conical carriers 8 of the same type can be arranged axially one behind the other. In Fig.1 two and in Fig.2 three carriers are arranged one behind the other. Each carrier 8 is rotated relative to the one in front by a slot division.

Jedes Lagerteil 9 wird durch einen fast bis zur Zentralachse 10 reichenden Schlitz 11 axial in zwei Teilbereiche unterteilt. Dadurch wird erreicht, daß das Lagerteil 9 auch tangentialfedernd ausgebildet ist. Zentral auf das Lager ausgeübte starke Kräfte können dadurch abgefangen werden. Zwischen den Lagerteilen 9 ist ein weiterer, nicht ganz so tiefer Schlitz 12 vorgesehen. Durch die Schlitze 11 und 12 können die Drucknadeln der Elektromagnete 5 hindurchgeführt werden, die in den federnden Lagerteilen der hinteren Träger 8 gelagert sind.Each bearing part 9 is axially divided into two partial areas by a slot 11 reaching almost to the central axis 10. This ensures that the bearing part 9 is also formed tangentially resilient. Strong forces exerted centrally on the bearing can thus be absorbed. A further slot 12, which is not quite as deep, is provided between the bearing parts 9. The pressure needles of the electromagnets 5, which are mounted in the resilient bearing parts of the rear supports 8, can be passed through the slots 11 and 12.

Zwischen den kegelförmigen Trägern 8 sind Metallfedern 13 angeordnet, die strahlenförmig ausgebildet sind. Jeder Strahl dieser Metallfeder 13ragt in den zugeordneten Bereich eines Lagerteiles 9 hinein. Die Form der Metallfeder 13 ist aus Fig.5 ersichtlich. Nach der Montage kommen die Schlitze 14 der Metallfeder 13 mit den Schlitzen 11 der Halterungen 8 zur Deckung, so daß die Drucknadeln unbehindert auch durch die Spannfedern hindurchgeführt werden können. Diese Metallfedern 13 stellen die federnden Ansätze 29 und 31 dar, die zum Einklemmen der Elektromagnete 5 dienen.Between the conical supports 8, metal springs 13 are arranged, which are designed in the form of a beam. Each beam of this metal spring 13 projects into the associated area of a bearing part 9. The shape of the metal spring 13 can be seen from Fig.5. After assembly, the slots 14 of the metal spring 13 overlap with the slots 11 of the brackets 8, so that the pressure needles can also be passed through the tension springs without hindrance. These metal springs 13 represent the resilient lugs 29 and 31, which are used to clamp the electromagnets 5.

Der Zusammenbau des hinteren Teiles 2 erfolgt dadurch, daß zunächst wechselweise ein Träger 8, dann eine Metallfeder 13 und wieder ein Träger 8 usw. auf einen Schraubbolzen 15 aufgefädelt wird. Im Anschluß an die letzte Metallfeder13 wird ein Distanzstück 16 aufgefädelt. Danach wird der Schraubbolzen 15 zentrisch auf die Grundplatte 3 aufgeschraubt und gesichert. Die Sicherung der kegelförmigen Träger 8 und der Metallfeder 13 gegen Verdrehung geschieht durch einen an jedem Träger 8 befindlichen Bolzen 17, der durch ein Loch 18 in der Metallfeder 13 hindurchragt und in ein nicht näher dargestelltes Loch in dem jeweils dahinterliegenden kegelförmigen Träger 8 eingreift.The rear part 2 is assembled by first alternately mounting a carrier 8, then a metal spring 13 and again a carrier 8, etc. on a screw bolt 15 is threaded. Following the last metal spring 13, a spacer 16 is threaded. The screw bolt 15 is then screwed centrally onto the base plate 3 and secured. The conical carrier 8 and the metal spring 13 are secured against rotation by a bolt 17 located on each carrier 8, which protrudes through a hole 18 in the metal spring 13 and engages in a hole (not shown in more detail) in the conical carrier 8 located behind it.

Nachdem die Träger 8 und die Metallfedern 13 auf der Grundplatte 3 befestigt sind, werden die Elektromagnete 5 mit den Drucknadeln 4 eingesetzt. Die Drucknadeln 4 werden hierzu in Löcher 19 der Grundplatte eingeführt, bis der zugeordnete Elektromagnet 5 in Höhe des zugeordneten Lagerteiles 9 liegt. Dann wird der Elektromagnet 5 gegen die Ansätze 29 und 31 der Metallfeder 13 gedrückt, die ausweicht, so daß nun der Elektromagnet 5 in den Lagerteil 9 eingeschoben werden kann. Der Elektromagnet 5 wird dann durch die Kraft der Metallfeder 13 gegen den festen sternförmigen Ansatz 20 des Lagerteiles 9 gedrückt und auf dem Lagerteil 9 gehalten.After the carrier 8 and the metal springs 13 are fastened on the base plate 3, the electromagnets 5 with the pressure needles 4 are inserted. For this purpose, the printing needles 4 are inserted into holes 19 of the base plate until the associated electromagnet 5 lies at the level of the associated bearing part 9. Then the electromagnet 5 is pressed against the lugs 29 and 31 of the metal spring 13, which dodges, so that the electromagnet 5 can now be inserted into the bearing part 9. The electromagnet 5 is then pressed by the force of the metal spring 13 against the fixed star-shaped projection 20 of the bearing part 9 and held on the bearing part 9.

Nunmehr kann der gesamte hintere Teil 2 einschließlich Halterungen und Elektromagnete durch zwei Halbschalen 21 und 22 einer Klemmvorrichtung abgeschlossen werden, in denen die Ausnehmungen 26 als Gegenlager für die Elektromagnete 5 vorgesehen sind. In Fig.1 ist nur eine dieser Halbschalen dargestellt. Beide Halbschalen können zusätzlich mit Kühlrippen versehen sein und besitzen Nuten 23 zur Halterung einer nicht dargestellten Schaltplatte für die elektrischen Anschlüsse.Now the entire rear part 2 including brackets and electromagnets can be closed by two half-shells 21 and 22 of a clamping device, in which the recesses 26 are provided as counter bearings for the electromagnets 5. Only one of these half-shells is shown in FIG. Both half-shells can additionally be provided with cooling fins and have grooves 23 for holding a circuit board (not shown) for the electrical connections.

Claims (5)

1. Nadeldruckkopf mit kreisförmig um eine Zentralachse angeordneten und die Drucknadeln betätigenden zylindrischen Elektromagneten,die in wiegenförmigen Stützen eines kegelförmigen Trägers gelagert sind, dadurch gekennzeichnet,
daß die Stützen (24,25) elastisch ausgebildet sind, daß die Elektromagnete (5) unter Federkraft in den wiegenförmigen Stützen (24,25) durch Klemmvorrichtungen (21,22) gelagert sind, die für alle Elektromagnete (5) gemeinsam sind und diese gegen den kegelförmigen Träger (8) halten, und daß jeder Elektromagnet (5) gegen eine Verschiebung in seiner Längsrichtung durch zwei Ansätze (29,31;20) gesichert ist, von denen mindestens einer (29,31) federnd ausgebildet ist.1. A needle printhead with a cylindrical electromagnet arranged in a circle around a central axis and actuating the printing needles, which is mounted in cradle-shaped supports of a conical carrier, characterized in that
that the supports (24, 25) are of elastic design, that the electromagnets (5) are mounted under spring force in the cradle-shaped supports (24, 25) by clamping devices (21, 22) which are common to all electromagnets (5) and these hold against the conical support (8) and that each electromagnet (5) is secured against displacement in its longitudinal direction by two lugs (29, 31; 20), at least one of which (29, 31) is resilient. 2. Nadeldruckkopf nach Anspruch 1, dadurch gekennzeichnet, daß der kegelförmige Träger (8) aus Kunststoff besteht, daß die wiegenförmigen Stützen (24,25) durch einen Schlitz (11) voneinander getrennt sind, der sich in Längsrichtung des zugeordneten Elektromagneten erstreckt, und daß ein weiterer Schlitz (12) in Längsrichtung der Elektromagnete (5) zwischen den wiegenförmigen Stützen (24,25) benachbarter Elektromagnete (5) vorgesehen ist.2. Needle print head according to claim 1, characterized in that the conical carrier (8) consists of plastic, that the cradle-shaped supports (24, 25) are separated from one another by a slot (11) which extends in the longitudinal direction of the associated electromagnet, and that a further slot (12) is provided in the longitudinal direction of the electromagnets (5) between the cradle-shaped supports (24, 25) of adjacent electromagnets (5). 3. Nadeldruckkopf nach den Ansprüchen 1 und 2, dadurch gekennzeichnet,
daß in dem jeweiligen Bereich der Elektromagnete (5) der Träger (8) eine Hinterschneidung (30) besitzt, die in Längsrichtung des Trägers (8) verläuft.3. Needle printhead according to claims 1 and 2, characterized in
that in the respective area of the electromagnets (5) the carrier (8) has an undercut (30) which extends in the longitudinal direction of the carrier (8). 4. Nadeldruckkopf nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet,
daß einer der Ansätze (20) für die Sicherung eines jeden Elektromagneten (5) als Wall an der wiegenförmigen Stütze (25) ausgebildet ist, und daß der andere der Ansätze (29,31) Teil einer sternförmigen Metallfeder (13) ist, die für alle Elektromagnete (15) gemeinsam vorgesehen und am Träger (8) befestigt ist.4. needle printhead according to claims 1 to 3, characterized in
that one of the lugs (20) for securing each electromagnet (5) is designed as a wall on the cradle-shaped support (25), and that the other of the lugs (29, 31) is part of a star-shaped metal spring (13) which is suitable for all electromagnets (15) are provided together and attached to the carrier (8). 5. Nadeldruckkopf nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß der Druckkopf (1,2) aus mehreren kegelförmigen Trägern (8) besteht, die in axialer Richtung hintereinander angeordnet sind, daß zwei aufeinanderfolgende Träger (8) um einen solchen Winkel zueinander verdreht sind, daß die Schlitze (11), welche die wiegenförmigen Stützen (24,25) des einen kegelförmigen Trägers (8) trennen, in Verlängerung der Schlitze (12) liegen, die zwischen den wiegenförmigen Stützen (24,25) benachbarter Elektromagnete (5) des anderen kegelförmigen Trägers (8) angeordnet sind.5. Needle print head according to claims 1 to 4, characterized in that the print head (1,2) consists of several conical supports (8) which are arranged one behind the other in the axial direction, that two successive supports (8) at such an angle to each other are twisted so that the slots (11), which separate the cradle-shaped supports (24, 25) of the one conical support (8), lie in the extension of the slots (12), which are between the cradle-shaped supports (24, 25) of adjacent electromagnets ( 5) of the other conical support (8) are arranged.
EP80200915A 1979-10-02 1980-09-29 Wire print head Expired EP0026549B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2939885A DE2939885C2 (en) 1979-10-02 1979-10-02 Dot matrix print head
DE2939885 1979-10-02

Publications (3)

Publication Number Publication Date
EP0026549A2 true EP0026549A2 (en) 1981-04-08
EP0026549A3 EP0026549A3 (en) 1982-02-03
EP0026549B1 EP0026549B1 (en) 1984-06-27

Family

ID=6082468

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80200915A Expired EP0026549B1 (en) 1979-10-02 1980-09-29 Wire print head

Country Status (9)

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US (1) US4350450A (en)
EP (1) EP0026549B1 (en)
JP (1) JPS6045593B2 (en)
BR (1) BR8006351A (en)
CA (1) CA1163137A (en)
DE (2) DE2939885C2 (en)
FI (1) FI69012C (en)
IE (1) IE51001B1 (en)
YU (1) YU250280A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2210331A (en) * 1987-09-30 1989-06-07 Seikosha Kk Printer head for use in a dot impact printer
US5846004A (en) * 1994-11-02 1998-12-08 Newbury Data Recording Limited Impact print head
WO2005075915A1 (en) * 2004-02-10 2005-08-18 Peter Dawson Flat plate heat exchanger coil and method of operating and cleaning the same

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
IT1156203B (en) * 1982-10-12 1987-01-28 Olivetti & Co Spa BALLISTIC TYPE PRINT HEAD
EP0157624A3 (en) * 1984-03-30 1987-07-29 Nec Home Electronics, Ltd. Printer head bank and method of manufacturing the same
US5146849A (en) * 1988-09-07 1992-09-15 Genicom Corporation Print head, mounting therefor and method of mounting

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Publication number Priority date Publication date Assignee Title
US3897865A (en) * 1973-12-11 1975-08-05 Ibm Dot printing apparatus

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US3966035A (en) * 1974-03-01 1976-06-29 Erickson Robert L Printer
NL7700695A (en) * 1974-06-25 1978-07-26 Singer Co PRESSURE HEAD.
US4004671A (en) * 1974-12-16 1977-01-25 Lrc, Inc. Wire matrix print head
DE2649213C3 (en) * 1976-10-28 1982-01-21 Siemens AG, 1000 Berlin und 8000 München Arrangement of magnet systems in a mosaic needle print head
IT1072304B (en) * 1976-12-30 1985-04-10 Olivetti & Co Spa HIGH SPEED WIRED PRINTING DEVICE FOR ACCOUNTING MACHINE TELEWRITE TERMINAL AND SIMILAR OFFICE MACHINE
DE2713886C2 (en) * 1977-03-29 1983-10-27 Siemens AG, 1000 Berlin und 8000 München Device for guiding the printer needles in a mosaic needle printer
US4218150A (en) * 1978-11-20 1980-08-19 Vydec, Inc. Matrix printer

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Publication number Priority date Publication date Assignee Title
US3897865A (en) * 1973-12-11 1975-08-05 Ibm Dot printing apparatus

Non-Patent Citations (1)

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Title
Zeitschrift "Electronics", März 1977, Seite 54 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2210331A (en) * 1987-09-30 1989-06-07 Seikosha Kk Printer head for use in a dot impact printer
GB2210331B (en) * 1987-09-30 1991-10-09 Seikosha Kk Printer head for use in a dot impact printer
US5846004A (en) * 1994-11-02 1998-12-08 Newbury Data Recording Limited Impact print head
WO2005075915A1 (en) * 2004-02-10 2005-08-18 Peter Dawson Flat plate heat exchanger coil and method of operating and cleaning the same

Also Published As

Publication number Publication date
IE802040L (en) 1981-04-02
EP0026549B1 (en) 1984-06-27
IE51001B1 (en) 1986-09-03
DE2939885C2 (en) 1983-10-20
DE3068363D1 (en) 1984-08-02
BR8006351A (en) 1981-04-14
YU250280A (en) 1983-06-30
JPS5656884A (en) 1981-05-19
CA1163137A (en) 1984-03-06
EP0026549A3 (en) 1982-02-03
FI69012C (en) 1985-12-10
FI803074A (en) 1981-04-03
DE2939885A1 (en) 1981-04-09
FI69012B (en) 1985-08-30
JPS6045593B2 (en) 1985-10-11
US4350450A (en) 1982-09-21

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