EP0157725B1 - Matrix print head with an adjustable print wire guide - Google Patents

Matrix print head with an adjustable print wire guide Download PDF

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Publication number
EP0157725B1
EP0157725B1 EP85730020A EP85730020A EP0157725B1 EP 0157725 B1 EP0157725 B1 EP 0157725B1 EP 85730020 A EP85730020 A EP 85730020A EP 85730020 A EP85730020 A EP 85730020A EP 0157725 B1 EP0157725 B1 EP 0157725B1
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EP
European Patent Office
Prior art keywords
print head
guide
print
matrix
guide support
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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
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EP85730020A
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German (de)
French (fr)
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EP0157725A2 (en
EP0157725A3 (en
Inventor
Harald Dipl.-Ing. Niebel
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Vodafone GmbH
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Mannesmann AG
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Priority to AT85730020T priority Critical patent/ATE54879T1/en
Publication of EP0157725A2 publication Critical patent/EP0157725A2/en
Publication of EP0157725A3 publication Critical patent/EP0157725A3/en
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Publication of EP0157725B1 publication Critical patent/EP0157725B1/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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface
    • 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
    • B41J2/25—Print wires
    • B41J2/255—Arrangement of the print ends of the wires

Definitions

  • the invention relates to a matrix printhead with an adjustable pressure needle guide, furthermore having a pressure needle drive assembly arranged on the side facing away from the pressure abutment and a pressure needle adjustment assembly facing the pressure abutment, which has an electromagnetically drivable guide mouthpiece for the pressure needles attached to a flexible guide carrier running parallel to the pressure needles
  • Guide carrier consists of a rigid rod which is pivotally mounted in the area or pressure needle drive assembly by means of a play-free joint and is held in its rest position by spring force or is returned to it.
  • Such adjustable guide mouthpieces serve to position one in the printing position in relation to one in steps of the continuously moving recording medium, e.g. a perforated paper web, the matrix print head is not to be adjusted with its full mass, but rather as closely as possible with the mass of the guide mouthpiece.
  • the adjustment of one or more pressure needle gaps e.g. consist of five to nine printing needles arranged one above the other, is used to generate fine writing or quick writing, with the fine writing one or more printing needle gaps being adjusted in the direction of the printing needle gaps.
  • JP-A-56 27 363 It is also known (JP-A-56 27 363) to design a matrix print head with an adjustable print needle guide in such a way that the electromagnet required for the adjustment is attached to the print head, so that the end face of the magnetic yoke surrounded by the electromagnetic coil is parallel to the print needles runs opposite guide beam and forms an adjusting air gap with this.
  • an exact adjustment for the guide mouthpiece is not possible due to a large number of manufacturing tolerances, nor can adjustment air gaps of the same size be achieved in production, moreover the matrix print head is relatively high and it is not possible to expand the system to two guide mouthpieces at all.
  • JP-A-56-44 676 Another known solution (JP-A-56-44 676) has an electromagnet mounted on the print head carriage for adjusting the guide carrier, an adjusting screw and a fixing screw being provided for adjusting the air gap.
  • This solution is even more difficult to get to grips in terms of accuracy, because the matrix printhead is stored separately on the printhead carriage and the electromagnet adjustment assembly must also be separately attached to the printhead carriage perpendicular to the running of the printing needles. The attachment points outside the matrix print head alone are problematic.
  • Another particular problem is the end positions of the guide mouthpiece, which have to be adhered to very precisely because of the printing accuracy desired for fine writing.
  • the invention is therefore based on the object, a precise adjustment for the guide mouthpiece with easy to control manufacturing tolerances, with a flat design in the area of the guide mouthpiece, with easy assembly, further for the possibility of conversion from one to several guide mouthpieces and for a safe setting of the end positions to accomplish.
  • the object is achieved in that a horizontally transverse to the guide carrier rests on the guide carrier by means of supporting projections, and in an armature bridge supported in a play-free pivot bearing, an electromagnet is attached next to the guide carrier in the interior of the printhead housing, the anchor bridge being associated with the guide carrier when the Electromagnet moved from its rest position.
  • the play-free joint and the play-free swivel bearing ensure extremely precise adjustment of the guide mouthpiece.
  • the anchor bridge allows a space-utilizing arrangement of the electromagnet without requiring a high construction in the area of the guide mouthpiece.
  • the division into a guide beam and an anchor bridge ensure easy assembly and economical production of the matrix printhead.
  • the support of the anchor bridge also ensures compliance with the end positions with great accuracy.
  • the play-free joint consists of a leaf spring which is rigidly fixed on the one hand to the body of the guide carrier and on the other hand rigidly attached to the printhead housing in the area of the pressure needle drive assembly.
  • the body of the guide carrier itself can be rigid and does not form a spring.
  • the cutting edge bearing consists of one in the print head round rod and a corresponding trough is formed in the anchor bridge. This design ensures economical production of the parts with a favorable choice of tolerance.
  • the assembly is additionally facilitated by the fact that the round rod of the cutting edge bearing is fastened in a removable cover of the printhead housing.
  • the armature bridge is underpinned by means of arms of a holder which run symmetrically to the cutting edge bearing.
  • Compliance with the adjustment of the guide mouthpiece or the guide mouthpieces for the pressure needle gaps or pressure needle gaps to be carried out between the pressure passports can be designed particularly advantageously in this case by providing the support projections on the anchor bridge at a fixed distance ratio from the cutting edge bearing. This idea encompasses a wide range of application of the individual adjustment stages, whereby it is made possible to achieve other adjustment distances for quick and fine writing simply by exchanging the anchor bridge.
  • a selection of different anchor bridges can therefore represent a wide range of different fonts or font qualities.
  • a space-saving arrangement i.e. A flat construction is also achieved with more than one guide carrier, in that the electromagnets are arranged laterally to the guide carriers in the case of two guide carriers running in parallel.
  • electromagnet is provided so that it can be adjusted from the outside on the matrix print head housing with respect to the working air gap.
  • the matrix printhead with an adjustable print needle guide lies as a whole opposite the pressure abutment 1 when the matrix printer is in operation.
  • the pressure abutment 1 generally consists of a cylindrical platen.
  • the pressure needle drive group 2 lies on the side facing away from the pressure abutment 1.
  • the structure of this pressure needle drive assembly 2 can be designed independently of the pressure needle adjustment assembly 3 or in the usual way. The structure is therefore not described. It is only important that the push pin drive assembly 2 e.g. is equipped for nine or two times nine printing needles 4.
  • the pressure needle adjusting assembly 3 has an electromagnetically drivable, vertically up and down adjustable guide mouthpiece 5, which is attached to an adjusting member 6.
  • the adjusting member 6 is essentially formed from the guide bracket 7 (a rigid rod) and a rear play-free joint 8.
  • the joint is free of play because it consists of a leaf spring 9 which is connected to the body 7a of the guide support 7 e.g. is connected by spot welding and is rigidly fastened by means of the screw 10 to a bearing 11a of the printhead housing 11, the leaf spring 9 bridging a gap 12 between the body 7a and the bearing 11a. This gap 12 is functionally part of the play-free joint 8.
  • the control element for the adjustment movement is the armature bridge 13, which rests in an equally play-free pivot bearing 14.
  • the electromagnet 15 is arranged below and to the side of the armature bridge 13 (FIGS. 2 and 4).
  • the armature bridge 13 projects above the magnetic core 15a, the working air gap being designated 16a.
  • the cutting edge bearing 17 can be implemented in several configurations, a game having to be avoided.
  • a backlash-free pivot bearing 14 or a knife-free cutting bearing 17 is formed by a round rod 21 fixed in the printhead housing 11 or an attached cover 11c in bearing heads 20a and 20b and the corresponding trough 22 of the anchor bridge 13.
  • the play-free pivot bearing 14 or the chip-free cutting bearing 17 is achieved when the cover 11c is installed and by tightening the screw 23, as a result of which the cover 11c is fixed in position on an edge surface 11 of the print head housing 11.
  • the armature breaks 13 through their trough 22 and the round rod 21 via the support projections 18 and 19 are actually in the operating position for the guide support 7, due to the leaf spring 9 there is no play in one of the two end positions.
  • the second end position is achieved by the electromagnet 15, the working air gap 16a being additionally adjustable.
  • This second adjustment possibility results from the adjustable electromagnet 15, which is attached to the outer section of the U-shaped magnetic core 15a by means of an adjusting screw 24.
  • the adjusting screw 24 is in front of a long groove 25 seen so that the electromagnet 15 can be adjusted from the bottom partially open side 2a of the pressure needle drive assembly 2.
  • two guide supports 7 are provided, which run parallel to one another, separated by a gap.
  • the anchor bridge 13 is gripped by means of the arms 26a and 26b of a holder 26, the holder 26 being fastened to the inside of the cover 11c by means of a leaf spring 27.
  • the support projections 18, 19 of the anchor bridge 13 are in the defined spacing ratio A: B (FIG. 2), which is assumed to be 1: 3 there as shown, but for any interchangeable anchor bridges 13, which is for quick writing or fine writing is reasonable, can assume that such anchor bridges can be stored with different distances between the support projections 18 and 19.
  • the electromagnets 15 are arranged for two guide supports 7 (FIGS. 3 and 4) laterally next to the guide supports 7 (in particular FIG. 4) and are perpendicular to their axis of action.

Abstract

A dot matrix print head which has on the side of the print countersupport (1) a print needle adjustment unit (3) with an electromagnetically drivable guide orifice (7) for the print needles (4) on an adjustment element (6). To provide a precise adjustment for the guide orifice (7) with controllable production tolerances, with flat design of the print head in the area of the guide orifice (7), and with easy installation, to provide a changeover for several guide orifices (7), and to define reliable end positions of the guide orifices (7), the adjustment element (6) consists of a guide support (7) mounted in the area of the print needle drive unit (2) and swiveling by means of a play-free joint (8). An electromagnet (15), fastened next to the guide support (7), is mounted on an armature bridge (13) supported in a play-free swivel bearing (14) running crossways to the guide support (7). The armature bridge (13) rests on the guide support (7) by spaced supporting projections (18), (19).

Description

Die Erfindung betrifft einen Matrixdruckkopf mit verstellbarer Drucknadelführung, ferner mit einer auf der zum Druckwiderlager abgewandten Seite angeordneten Drucknadelantriebsbaugruppe und einer dem Druckwiderlager zugewandten Drucknadelverstellbaugruppe, die ein elektromagnetisch antreibbares, an einem parallel zu den Drucknadeln verlaufenden gelennigen Führungsträger befestigtes Fuhrungsmundstück für die Drucknadeln aufweist, wobei der Führungsträger aus einen starren Stab besteht, der im Bereich oder Drucknadelantriebsbaugruppe schwenkbar mittels eines spielfreien Gelenkes gelagert ist und durch Federkraft in seiner Ruhestellung gehalten bzw. zu dieser zurückgeführt wird.The invention relates to a matrix printhead with an adjustable pressure needle guide, furthermore having a pressure needle drive assembly arranged on the side facing away from the pressure abutment and a pressure needle adjustment assembly facing the pressure abutment, which has an electromagnetically drivable guide mouthpiece for the pressure needles attached to a flexible guide carrier running parallel to the pressure needles Guide carrier consists of a rigid rod which is pivotally mounted in the area or pressure needle drive assembly by means of a play-free joint and is held in its rest position by spring force or is returned to it.

Derartige verstellbare Führungsmundstücke dienen dazu, einen sich in Druckstellung gegenüber einem in Schritten der kontinuierlich bewegten Aufzeichnungsträger, wie z.B. einer randgelochten Papierbahn, befindlichen Matrixdruckkopf nicht mit seiner vollen Masse, sondern möglichst nut mit der Masse des Führungsmundstückes zu verstellen. Die Verstellung einzelner oder mehrerer Drucknadelspalten, die z.B. aus fünf bis neun übereinander angeordneten Drucknadeln bestehen, dient der Erzeugung von Schönschrift bzw. von Schnellschrift, wobei der Schönschrift eine oder mehrere Drucknadelspalten in Richtung der Drucknadelspalte verstellt werden.Such adjustable guide mouthpieces serve to position one in the printing position in relation to one in steps of the continuously moving recording medium, e.g. a perforated paper web, the matrix print head is not to be adjusted with its full mass, but rather as closely as possible with the mass of the guide mouthpiece. The adjustment of one or more pressure needle gaps, e.g. consist of five to nine printing needles arranged one above the other, is used to generate fine writing or quick writing, with the fine writing one or more printing needle gaps being adjusted in the direction of the printing needle gaps.

Es ist bekannt (DE-A-30 41 877; DE-A-26 32 293), das Verstellorgan des eingangs bezeichneten Matrixdruckkopfes aus einem Hebel zu bilden, der aus federndem Werkstoff hergestellt und um eine Achse schwenkbar gelagert ist. Ein solches Verstellorgan bedarf, wie sich gezeigt hat, einer genauen Führung und einer Bauweise, die eine bessere Einsichtnahme auf den Druckvorgang ermöglicht, die wirtschaftliche Herstellung gewährleistet, wozu auch eine leichte Montage gehört und eine vorbereitende Gestaltung für die Umrüstung von einem auf zwei oder mehr verstellbaren Führungsmundstücken.It is known (DE-A-30 41 877; DE-A-26 32 293) to form the adjusting element of the matrix print head referred to at the outset from a lever which is made of resilient material and is pivotably mounted about an axis. Such an adjusting element, as has been shown, requires precise guidance and a construction which enables a better view of the printing process, which ensures economical production, which also includes easy assembly and a preparatory design for the conversion from one to two or more adjustable guide mouthpieces.

Es ist außerdem bekannt (JP-A-56 27 363) einen Matrixdruckkopf mit verstellbarer Drucknadelführung dahingehende zu gestalten, daß der zum Verstellen benötigte Elektromagnet an dem Druckkopf befestigt wird, so daß das von der Elektromagnetspule umgebene Magnetjoch mit seiner Stirnseite einem parallel zu den Drucknadeln verlaufenden Führungsträger gegenüberliegt und mit diesem einen Verstell-Luftspalt bildet. Hier ist weder eine genaue Verstellung für das Führungsmundstück wegen einer Vielzahl von Fertigungstoleranzen möglich, noch können in der Fertigung ausreichend gleichgroße Verstell-Luftspalte erzielt werden, außerdem baut der Matrixdruckkopf relativ hoch und eine Erweiterung des Systems auf zwei Führungsmundstücke ist überhaupt nicht möglich.It is also known (JP-A-56 27 363) to design a matrix print head with an adjustable print needle guide in such a way that the electromagnet required for the adjustment is attached to the print head, so that the end face of the magnetic yoke surrounded by the electromagnetic coil is parallel to the print needles runs opposite guide beam and forms an adjusting air gap with this. Here, an exact adjustment for the guide mouthpiece is not possible due to a large number of manufacturing tolerances, nor can adjustment air gaps of the same size be achieved in production, moreover the matrix print head is relatively high and it is not possible to expand the system to two guide mouthpieces at all.

Eine andere bekannte Lösung (JP-A-56-44 676) weist einen auf dem Druckkopfwagen montierten Elektromagneten zum Verstellen des Führungsträgers auf, wobei eine Verstellschraube und eine Fixierschraube zum Einstellen des Luftspaltes vorgesehen sind. Diese Lösung ist bezüglich Genauigkeit noch schwieriger in den Griff zu bekommen, weil der Matrixdruckkopf für sich separat am Druckkopfwagen gelagert ist und die Elektromagnetverstellbaugruppe senkrecht zum Velauf der Drucknadeln ebenfalls für sich getrennt am Druckkopfwagen befestigt sein muß. Allein die Befestigungsstellen außerhalb des Matrixdruckkopfes sind problematisch.Another known solution (JP-A-56-44 676) has an electromagnet mounted on the print head carriage for adjusting the guide carrier, an adjusting screw and a fixing screw being provided for adjusting the air gap. This solution is even more difficult to get to grips in terms of accuracy, because the matrix printhead is stored separately on the printhead carriage and the electromagnet adjustment assembly must also be separately attached to the printhead carriage perpendicular to the running of the printing needles. The attachment points outside the matrix print head alone are problematic.

Ein besonderes Problem stellen außerdem die Endlagen des Führungsmundstückes dar, die wegen der angestrebten Druckgenauigkeit für Schönschrift sehr exakt eingehalten werden müssen.Another particular problem is the end positions of the guide mouthpiece, which have to be adhered to very precisely because of the printing accuracy desired for fine writing.

Der Erfindung liegt deshalb die Aufgabe zugrunde, eine genaue Verstellung für das Führungsmundstück bei leicht zu beherrschenden Fertifungstoleranzen, bei flacher Bauweise im Bereich des Führungsmundstückes, bei leichter Montage, ferner für die Möglichkeit der Umgestaltung von einem auf mehrere Führungsmundstücke und für eine sichere Einstellung der Endlagen zu schaffen.The invention is therefore based on the object, a precise adjustment for the guide mouthpiece with easy to control manufacturing tolerances, with a flat design in the area of the guide mouthpiece, with easy assembly, further for the possibility of conversion from one to several guide mouthpieces and for a safe setting of the end positions to accomplish.

Die gestellte Aufgabe wird dadurch gelöst, daß einer horizontal quer zum Führungsträger verlaufenden auf dem Führungsträger mittels Stützvorsprüngen aufliegt enden, und in einer spielfreien Schwenklagerung abgestützten Ankerbrücke ein neben dem Führungsträger im innern des Druckkopfgehäuses befestigter Elektromagnet zugeordnet ist, wobei die Ankerbrücke den Führungsträger bei Betätigung des Elektromagneten aus seiner Ruhestellung bewegt. Das spielfreie Gelenk und die spielfreie Schwenklagerung gewährleisten eine äußerst genaue Verstellung des Führungsmundstücks. Die Ankerbrücke gestattet eine raumausnutzende Anordnung des Elektromagneten, ohne eine hohe Bauweise im Bereich des Führungsmundstückes zu erfordern. Die Aufgliederung in einen Führungsträger und eine Ankerbrücke sichern leichte Montage und wirtschaftliche Herstellung des Matrixdruckkopfes. Die Aufstützung der Ankerbrücke gewährleistet überdies die Einhaltung der Endlagen mit großer Genauigkeit.The object is achieved in that a horizontally transverse to the guide carrier rests on the guide carrier by means of supporting projections, and in an armature bridge supported in a play-free pivot bearing, an electromagnet is attached next to the guide carrier in the interior of the printhead housing, the anchor bridge being associated with the guide carrier when the Electromagnet moved from its rest position. The play-free joint and the play-free swivel bearing ensure extremely precise adjustment of the guide mouthpiece. The anchor bridge allows a space-utilizing arrangement of the electromagnet without requiring a high construction in the area of the guide mouthpiece. The division into a guide beam and an anchor bridge ensure easy assembly and economical production of the matrix printhead. The support of the anchor bridge also ensures compliance with the end positions with great accuracy.

Eine Ausgestaltung dieses Grundgedankens ist dadurch gegeben, daß das spielfreie Gelenk aus einer Blattfeder besteht, die einerseits starr am Körper des Führungsträger und andererseits im Bereich der Drucknadelantriebsbaugruppe starr am Druckkopfgehäuse befestigt ist. Vorteilhaft ist neben der Spielfreiheit, daß der Körper des Führungsträger selbst starr sein kann und keine Feder bildet.An embodiment of this basic idea is given in that the play-free joint consists of a leaf spring which is rigidly fixed on the one hand to the body of the guide carrier and on the other hand rigidly attached to the printhead housing in the area of the pressure needle drive assembly. In addition to the freedom from play, it is advantageous that the body of the guide carrier itself can be rigid and does not form a spring.

Zur genauen Verstellung des Führungsträgers trägt auch bei, daß die spielfreie Schwenklagerung für die Ankerbrücke aus einer Schneidenlagerung gebildet ist. Bei einer solchen Schneidenlagerung kann hier der Vorteil einer geringer Reibung ausgenutzt werden.The fact that the play-free pivot bearing for the anchor bridge is formed from a cutting edge bearing also contributes to the exact adjustment of the guide carrier. With such a cutting edge bearing, the advantage of low friction can be exploited here.

Fertigungstechnisch ist hierbei vorteilhaft, daß die Schneidenlagerung aus einem im Druckkopfgehäuse gelagerten runden Stab und einer korrespondierenden Mulde in der Ankerbrücke gebildet ist. Diese Gestaltung sichert eine wirtschaftliche Herstellung der Teile bei günstiger Toleranzwahl.From a manufacturing point of view, it is advantageous that the cutting edge bearing consists of one in the print head round rod and a corresponding trough is formed in the anchor bridge. This design ensures economical production of the parts with a favorable choice of tolerance.

Die Montage wird zusätzlich dadurch erleichtert, daß der runde Stab der Schneidenlagerung in einem abnehmbaren Deckel des Druckkopfgehäuses befestigt ist.The assembly is additionally facilitated by the fact that the round rod of the cutting edge bearing is fastened in a removable cover of the printhead housing.

Das vorstehend beschriebene System erlaubt nunmehr ohne großen Aufwand, daß mehr als ein Führungsträger in Parallelanordnung vorgesehen ist.The system described above now allows, without great effort, that more than one guide carrier is provided in a parallel arrangement.

Für die genaue Einhaltung der Mittelstellung in einem Mehr-Verstellorgan-System ist ferner vorteilhaft, wenn die Ankerbrücke mittels symmetrisch zur Schneidenlagerung verlaufender Arme eines Halters unterfaßt ist.For the exact maintenance of the middle position in a multi-adjustment system, it is also advantageous if the armature bridge is underpinned by means of arms of a holder which run symmetrically to the cutting edge bearing.

Die Einhaltung der zwischen den Druckpässen vorzunehmenden Verstellung des Führungsmundstückes bzw. der Führungsmundstücke für die Drucknadelspalte bzw. Drucknadelspalten kann hierbei besonders vorteilhaft gestaltet sein, indem die Stützvorsprünge an der Ankerbrücke in einem festgelegten Abstandsverhältnis zur Schneidenlagerung vorgesehen sind. Dieser Gedanke umfaßt einen breiten Anwendungsbereich der einzelnen Verstellstufen, wobei es möglich gemacht wird, alleine durch Austauschen der Ankerbrücke andere Verstellabstände für Schnell-und Schönschrift zu erzielen.Compliance with the adjustment of the guide mouthpiece or the guide mouthpieces for the pressure needle gaps or pressure needle gaps to be carried out between the pressure passports can be designed particularly advantageously in this case by providing the support projections on the anchor bridge at a fixed distance ratio from the cutting edge bearing. This idea encompasses a wide range of application of the individual adjustment stages, whereby it is made possible to achieve other adjustment distances for quick and fine writing simply by exchanging the anchor bridge.

Eine Auswahl von unterschiedlichen Ankerbrücken kann daher eine breite Fächerung unterschiedlicher Schriftarten bzw. Schriftqualitäten darstellen.A selection of different anchor bridges can therefore represent a wide range of different fonts or font qualities.

Eine raumsparende Anordnung, d.h. eine flache Bauweise wird auch bei mehr als einem Führungsträger erzielt, indem bei zwei parallel verlaufenden Führungsträgern die Elektromagnete jeweils seitlich zu den Führungsträgern angeordnet sind.A space-saving arrangement, i.e. A flat construction is also achieved with more than one guide carrier, in that the electromagnets are arranged laterally to the guide carriers in the case of two guide carriers running in parallel.

Eine zusätzliche Justierungsmöglichkeit wird außerdem dadurch erzielt, daß der Elektromagnet von außen am Matrixdruckkopfgehäuse bezüglich des Arbeitsluftspaltes einstellbar vorgesehen ist.An additional adjustment possibility is also achieved in that the electromagnet is provided so that it can be adjusted from the outside on the matrix print head housing with respect to the working air gap.

Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im folgenden näher beschrieben. Es zeigen:

  • Fig. 1 einen axialen Teillängsschnitt durch einen Matrixdruckkopf mit einem Führungsträger;
  • Fig. 2 einen Querschnitt durch den Gegenstand der Fig. 1 entsprechend dem Schnitt 11-11 in Fig. 1;
  • Fig. 3 einen axialen Teillängsschnitt durch den Matrixdruckkopf mit zwei Führungsträgern;
  • Fig. 4 einen Querschnitt durch den Gegenstand der Fig. 3 entsprechend dem Schnitt 111-111 in Fig. 3.
Embodiments of the invention are shown in the drawing and are described in more detail below. Show it:
  • 1 shows an axial partial longitudinal section through a matrix print head with a guide carrier.
  • FIG. 2 shows a cross section through the object of FIG. 1 corresponding to section 11-11 in FIG. 1;
  • 3 shows an axial partial longitudinal section through the matrix print head with two guide supports;
  • 4 shows a cross section through the object of FIG. 3 corresponding to section 111-111 in FIG. 3rd

Der Matrixdruckkopf mit verstellbarer Drucknadelführung liegt als Ganzes im Betrieb des Matrixdruckers dem Druckwiderlager 1 gegenüber. Das Druckwiderlager 1 besteht am allgemeinen aus einer zylindrischen Schreibwalze. Die Drucknadelantriebsgruppe 2 liegt auf der zum Druckwiderlager 1 abgewandten Seite. Der Aufbau dieser Drucknadelantriebsbaugruppe 2 kann unabhängig von der Drucknadelverstellbaugruppe 3 bzw. in üblicher Weise gestaltet sein. Der Aufbau wird daher nicht beschrieben. Es ist lediglich von Bedeutung, daß die Drucknadelantriebsbaugruppe 2 z.B. für neun oder zwei mal neun Drucknadeln 4 ausgerüstet ist.The matrix printhead with an adjustable print needle guide lies as a whole opposite the pressure abutment 1 when the matrix printer is in operation. The pressure abutment 1 generally consists of a cylindrical platen. The pressure needle drive group 2 lies on the side facing away from the pressure abutment 1. The structure of this pressure needle drive assembly 2 can be designed independently of the pressure needle adjustment assembly 3 or in the usual way. The structure is therefore not described. It is only important that the push pin drive assembly 2 e.g. is equipped for nine or two times nine printing needles 4.

Die Drucknadelverstellbaugruppe 3 weist ein elektromagnetisch angreibbares, vertikal auf- und abverstellbares Führungsmundstück 5 auf, das an einem Verstellorgan 6 befestigt ist. Das Verstellorgan 6 wird im wesentlichen aus dem Führungsträger 7 (einem starren Stab) und einem rückwärtigen spielfreien Gelenk 8 gebildet. Das Gelenk ist spielfrei, weil es aus einer Blattfeder 9 besteht, die mit dem Körper 7a des Führungsträgers 7 z.B. durch Punktschweißung verbunden ist und mittels der Schraube 10 an einem Lager 11a des Druckkopfgehäuses 11 starr befestigt ist, wobei die Blattfeder 9 einen Spalt 12 zwischen dem Körper 7a und dem Lager 11a überbrückt. Dieser Spalt 12 ist funktionell Teil des spielfreien Gelenkes 8.The pressure needle adjusting assembly 3 has an electromagnetically drivable, vertically up and down adjustable guide mouthpiece 5, which is attached to an adjusting member 6. The adjusting member 6 is essentially formed from the guide bracket 7 (a rigid rod) and a rear play-free joint 8. The joint is free of play because it consists of a leaf spring 9 which is connected to the body 7a of the guide support 7 e.g. is connected by spot welding and is rigidly fastened by means of the screw 10 to a bearing 11a of the printhead housing 11, the leaf spring 9 bridging a gap 12 between the body 7a and the bearing 11a. This gap 12 is functionally part of the play-free joint 8.

Das Steuerglied für die Verstellbewegung stellt die Ankerbrücke 13 dar, die in einer ebenso spielfreien Schwenklagerung 14 ruht. Der Elektromagnet 15 ist unterhalb und seitlich von der Ankerbrücke 13 angeordnet (Fig 2 und 4). Die Ankerbrücke 13 überragt den Magnetkern 15a, wobei der Arbeitsluftspalt mit 16a bezeichnet ist. Bei Bestromung des Elektromagneten 15 schwenkt die Ankerbrücke 13 um die Schneidenlagerung 17 und drückt durch die Stützvorsprünge 18 bzw. 19 dem Führungsträger 7 nach unten.The control element for the adjustment movement is the armature bridge 13, which rests in an equally play-free pivot bearing 14. The electromagnet 15 is arranged below and to the side of the armature bridge 13 (FIGS. 2 and 4). The armature bridge 13 projects above the magnetic core 15a, the working air gap being designated 16a. When the electromagnet 15 is energized, the armature bridge 13 swivels around the cutting edge bearing 17 and presses the guide carrier 7 downward through the support projections 18 and 19, respectively.

Die Schneidenlagerung 17 kann in mehrere Ausgestaltungen verwirklicht werden, wobei ein Spiel vermieden werden muß. Eine spielfreie Schwenklagerung 14 bzw. eine speilfreie Schneidenlagerung 17 wird durch einen im Druckkopfgehäuse 11 bzw. einem aufgesetzten Deckel 11c in Lagerköpfen 20a und 20b fixierten runden Stab 21 und der korrespondierenden Mulde 22 der Ankerbrücke 13 gebildet. Die spielfreie Schwenklagerung 14 bzw. die speilfreie Schneidenlagerung 17 wird bei Montage des Deckels 11c und durch Festziehen der Schraube 23 erreicht, wodurch der Deckel 11c eine fixierte Lage auf einer Randfläche 11 des Druckkopfgehäuses 11 erhält. Nach dieser Montage durch den Deckel 11 c ist die Ankerbrüche 13 durch ihre Mulde 22 und den runden Stab 21 über die Stützvorsprünge 18 und 19 eigentlich in der Betriebslage zum Führungsträger 7, ber bedingt durch die Blattfeder 9 spielfrei in einer der beiden Endlagen liegt. Die zweite Endlage wird durch den Elektromagneten 15 erzielt, wobei der Arbeitsluftspalt 16a zusätzlich justierbar ist. Diese zweite Justiermöglichkeit ergibt sich durch den einstellbar gelagerten Elektromagneten 15, der am äußeren Abschnitt des U-förmig gebogenen Magnetkerns 15a mittels einer Einstellschraube 24 befestigt ist. Die Einstellschraube 24 ist innerhalb einer Langnute 25 vorgesehen, so daß der Elektromagnet 15 von der unten teilweise offenen Seite 2a der Drucknadelantriebsbaugruppe 2 eingestellt werden kann.The cutting edge bearing 17 can be implemented in several configurations, a game having to be avoided. A backlash-free pivot bearing 14 or a knife-free cutting bearing 17 is formed by a round rod 21 fixed in the printhead housing 11 or an attached cover 11c in bearing heads 20a and 20b and the corresponding trough 22 of the anchor bridge 13. The play-free pivot bearing 14 or the chip-free cutting bearing 17 is achieved when the cover 11c is installed and by tightening the screw 23, as a result of which the cover 11c is fixed in position on an edge surface 11 of the print head housing 11. After this assembly by the cover 11 c, the armature breaks 13 through their trough 22 and the round rod 21 via the support projections 18 and 19 are actually in the operating position for the guide support 7, due to the leaf spring 9 there is no play in one of the two end positions. The second end position is achieved by the electromagnet 15, the working air gap 16a being additionally adjustable. This second adjustment possibility results from the adjustable electromagnet 15, which is attached to the outer section of the U-shaped magnetic core 15a by means of an adjusting screw 24. The adjusting screw 24 is in front of a long groove 25 seen so that the electromagnet 15 can be adjusted from the bottom partially open side 2a of the pressure needle drive assembly 2.

Im Ausführungsbeispiel nach den Fig. 3 und 4 sind zwei Führungsträger 7 vorgesehen, die durch einen Spalt getrennt zueinander parallel verlaufen. Hier wird die Ankerbrücke 13 mittels der Arme 26a und 26b eines Halters 26 unterfaßt, wobei der Halter 26 mittels einer Blattfeder 27 an der Innenseite des Deckels 11c befestigt ist.In the exemplary embodiment according to FIGS. 3 and 4, two guide supports 7 are provided, which run parallel to one another, separated by a gap. Here, the anchor bridge 13 is gripped by means of the arms 26a and 26b of a holder 26, the holder 26 being fastened to the inside of the cover 11c by means of a leaf spring 27.

Bei beiden Ausführungsbeispielen stehen die Stützvorsprünge 18, 19 der Ankerbrücke 13 in dem festgelegten Abstandverhältnis A:B (Fig. 2), das dort wie gezeichnet mit 1:3 angenommen ist, jedoch für austauschbare Ankerbrücken 13 jeden beliebigen Wert, der für Schnellschrift oder Schönschrift sinnvoll ist, annehmen kann, so daß solche Ankerbrücken mit unterschiedlichen Abständen der Stützvorsprünge 18 und 19 bevorratet sein können.In both exemplary embodiments, the support projections 18, 19 of the anchor bridge 13 are in the defined spacing ratio A: B (FIG. 2), which is assumed to be 1: 3 there as shown, but for any interchangeable anchor bridges 13, which is for quick writing or fine writing is reasonable, can assume that such anchor bridges can be stored with different distances between the support projections 18 and 19.

Die Elektromagnete 15 sind für zwei Führungsträger 7 (Fig. 3 und 4) jeweils seitlich neben den Führungsträgern 7 (insbesondere Fig. 4) angeordnet und liegen mit ihrer Wirkungsachse lotrecht.The electromagnets 15 are arranged for two guide supports 7 (FIGS. 3 and 4) laterally next to the guide supports 7 (in particular FIG. 4) and are perpendicular to their axis of action.

Claims (10)

1. A matrix print head with adjustable print wire guide, print wire drive components (2) located on the side remote from the print surface (1) and print wire adjustment components (3) close to the print surface (1), which adjustment components have an electromagnetically drivable guide mouthpiece (5) for the print wires (4) which is attached to an articulated guide support (7) extending parallel to the print wires (4), the guide support (7) consisting of a rigid bar which is pivoted in the vicinity of the print wire drive components (2) by means of a play-free link (8) and is held in or returned to its rest position by spring force, characterised in that an electromagnet (15) attached next to the guide support (7) in the interior of the print head housing (11) is allocated to an armature bridge (13) which extends horizontally transversely to the guide support (7) and rests on the guide support (7) by means of supporting projections (18, 19) and is supported in a play-free swivel bearing (14), the armature bridge (13) moving the guide support (7) from its rest position when the electromagnet (15) is operated.
2. A matrix print head according to Claim 1, characterised in that the play-free link (8) consists of a leaf spring (9) which is attached rigidly to the body (7a) of the guide support (7) on one side and is attached rigidly to the print head housing (11) in the vicinity of the print wire drive components (2) on the other side.
3. A matrix print head according to Claim 1, characaterised in that the play-free swivel bearing (14) for the armature bridge (13) is formed by a knife-edge bearing (7).
4. a matrix print head according to Claim 3, characterised in that the knife-edge bearing (17) is formed by a round bar (21) mounted in the print head housing (11) and a corresponding depression (22) in the armature bridge (13).
5. A matrix print head according to Claims 3 and 4, characterised in that the round bar (21) of the knife-edge bearing (17) is fastened in a removable cover (11c) of the print head housing (11).
6. A matrix print head according to Claims 1 to 5, characterized in that more than one guide support (7) is provided in a parallel layout.
7. A matrix print head according to Claims 1 to 6, characterised in that the armature bridge (13) is held underneath by means of arms (26a, 26b) of a holder (26) which extend symmetrically to the knife-edge bearing (17).
8. A matrix print head according to Claims 1 to 7, characterised in that the supporting projections (18,19) are provided on the armature bridge (13) in a fixed spacing ratio to the knife-edge bearing (17).
9. A matrix print head according to Claims 1 to 8, characterised in that in the case of two parallel guide supports (7) the electromagnets (15) are each arranged laterally to the guide supports (7).
10. A matrix print head according to Claims 1 to 9, characterised in that the electromagnet (15) is provided on the matrix print head housing (11) to be adjustable from outside with respect to the operating air gap (16a).
EP85730020A 1984-04-03 1985-02-06 Matrix print head with an adjustable print wire guide Expired - Lifetime EP0157725B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85730020T ATE54879T1 (en) 1984-04-03 1985-02-06 MATRIX PRINT HEAD WITH ADJUSTABLE NEEDLE GUIDE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843412856 DE3412856A1 (en) 1984-04-03 1984-04-03 MATRIX PRINT HEAD WITH ADJUSTABLE PRINT NEEDLE GUIDE
DE3412856 1984-04-04

Publications (3)

Publication Number Publication Date
EP0157725A2 EP0157725A2 (en) 1985-10-09
EP0157725A3 EP0157725A3 (en) 1986-12-03
EP0157725B1 true EP0157725B1 (en) 1990-07-25

Family

ID=6232784

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85730020A Expired - Lifetime EP0157725B1 (en) 1984-04-03 1985-02-06 Matrix print head with an adjustable print wire guide

Country Status (5)

Country Link
US (1) US4629344A (en)
EP (1) EP0157725B1 (en)
JP (1) JPS60217167A (en)
AT (1) ATE54879T1 (en)
DE (2) DE3412856A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH667618A5 (en) * 1986-03-21 1988-10-31 Hermes Precisa International SWITCHABLE WRITING HEAD.
EP0314851B1 (en) * 1987-11-06 1992-02-12 MANNESMANN Aktiengesellschaft Needle matrix printer with adjustable print needle guide
DE4020010A1 (en) * 1990-06-21 1992-01-09 Mannesmann Ag MATRIX NEEDLE PRINT HEAD
IT1247770B (en) * 1990-10-31 1994-12-30 Microlys Spa DOT MATRIX PRINT HEAD FOR HIGH DEFINITION OR HIGH SPEED PRINTING

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3882985A (en) * 1973-07-23 1975-05-13 Ncr Co Tiltable matrix print head to permit viewing of the characters
US4010835A (en) * 1975-08-01 1977-03-08 International Business Machines Corporation Matrix print head
DE2535699C3 (en) * 1975-08-09 1978-12-14 Olympia Werke Ag, 2940 Wilhelmshaven Method and printer for producing fine-screen characters on a recording medium
JPS5644676A (en) * 1979-09-20 1981-04-23 Canon Inc Wire matrix printer
JPS5627363A (en) * 1979-08-15 1981-03-17 Canon Inc Wire dot printing head
US4459051A (en) * 1979-08-15 1984-07-10 Canon Kabushiki Kaisha Matrix printer
JPS5662165A (en) * 1979-10-29 1981-05-27 Seikosha Co Ltd Serial dot printer
DE3022128C2 (en) * 1980-06-10 1983-12-08 Mannesmann AG, 4000 Düsseldorf Print head for generating print characters using the matrix printing process
DE3041877A1 (en) * 1980-11-06 1982-05-13 Mannesmann AG, 4000 Düsseldorf MATRIX PRINTER AND RELATED NEEDLE PRINT HEAD
DE3243475A1 (en) * 1982-11-22 1984-05-24 Mannesmann AG, 4000 Düsseldorf NEEDLE PRINT HEAD FOR MATRIX PRINTER

Also Published As

Publication number Publication date
JPH0442991B2 (en) 1992-07-15
DE3578805D1 (en) 1990-08-30
DE3412856A1 (en) 1985-10-03
EP0157725A2 (en) 1985-10-09
DE3412856C2 (en) 1987-09-03
EP0157725A3 (en) 1986-12-03
ATE54879T1 (en) 1990-08-15
JPS60217167A (en) 1985-10-30
US4629344A (en) 1986-12-16

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