EP0052066B1 - Matrix printer and wire print head therefor - Google Patents

Matrix printer and wire print head therefor Download PDF

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Publication number
EP0052066B1
EP0052066B1 EP81730090A EP81730090A EP0052066B1 EP 0052066 B1 EP0052066 B1 EP 0052066B1 EP 81730090 A EP81730090 A EP 81730090A EP 81730090 A EP81730090 A EP 81730090A EP 0052066 B1 EP0052066 B1 EP 0052066B1
Authority
EP
European Patent Office
Prior art keywords
print head
needle
mouthpiece
head according
matrix
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81730090A
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German (de)
French (fr)
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EP0052066A3 (en
EP0052066A2 (en
Inventor
Wolfgang Hendrischk
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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Application filed by Mannesmann AG filed Critical Mannesmann AG
Publication of EP0052066A2 publication Critical patent/EP0052066A2/en
Publication of EP0052066A3 publication Critical patent/EP0052066A3/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
    • 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
    • B41J25/005—Mechanisms for bodily moving print heads or carriages parallel to the paper surface for serial printing movements superimposed to character- or line-spacing movements

Definitions

  • the invention relates to a matrix printer with a needle print head which can be moved in print passports and which is located in the print position relative to a record carrier which can be moved between the print passes, with an adjustable mouthpiece in which the needles are guided one above the other at intervals in bores, with a basic position of the mouthpiece for quick writing and the like different positions are provided for reciprocating print passes for fine writing.
  • Such a matrix printer serves the purpose. to produce different printing qualities of the characters at different writing speeds.
  • a matrix printer only ever serves one task, namely to print characters either at high speed (but the print quality of the characters is lower) or at high print quality (but the speed of writing is lower).
  • the offset with the size zero is selected for the fast writing, while an offset of the mouthpiece greater than zero is set for the writing.
  • the present invention is therefore based on the object of creating a matrix print head with an associated needle print head. which does not relate the smallest step of paper movement to half the needle pitch because it is relatively difficult to move the paper by such small pitches.
  • the printhead to be created for fine writing or quick writing should also be usable as desired and should furthermore improve the quick writing and / or fine writing.
  • the object is achieved in that with the adjustment of the mouthpiece by partial values of the distance between two consecutive pressure needles in a needle gap, i. H. with a mechanically finer division of the matrix in character height is also an electronic finer division of the matrix in character width.
  • the ratio of the division in character height and in character width for quick writing and for fine writing is at least 0.4: 1 or greater.
  • the invention accordingly allows a combined application of the method. refine the matrix both in the needle column direction and in the writing direction, transverse to the direction of the career of the recording medium.
  • the invention solves the problem of paper feed, which can take place outside the print movement of the print head. The paper can thus be held in place during printing. All of these influences work together. to create a faster and more beautiful font in combination based on the theory of the invention.
  • only one (replaceable) printhead is required for quick and fine writing.
  • the electronic fine division can preferably use two separate character generators, with the control system (e.g. a microprocessor with program memory) alternately calling up the finely or roughly divided clocks.
  • An embodiment of the invention is provided. that the refinement of the matrix from 9 x 7 to 18 x 40, 18 x 28 or 36 x 40 is carried out on an at least two-part mouthpiece with needle gaps.
  • a practical embodiment for the drive design consists in the fact that the organ transmitting the adjusting drive force consists of a pivotable lever mounted on the printhead base frame with pole faces which are opposite the poles of a magnet which can be switched on and off.
  • the organ transmitting the adjustment drive force consists of a shaft rotatably mounted on the printhead base frame. which carries the intermediate piece, the one with mutually facing pole faces opposite the magnetic poles of two mutually associated Magnets is arranged, the shaft being connected to two mouthpieces by means of a parallelogram linkage.
  • the adjustment drive consists of one or two electromagnets.
  • the intermediate member is designed in the form of a rocker.
  • the invention also allows the intermediate member to be designed in the form of a pointer.
  • a further embodiment of the invention is that the organ connected to the mouthpiece extends approximately in the direction of the needle bundle and can be moved back and forth by means of the adjustment drive transversely to the direction of flight of the printing needles by a fraction or a multiple of a needle distance measured in the direction of movement.
  • a further practical embodiment of the invention results from the fact that the adjusting drive for the back and forth movement of the organ is formed by means of an axially fixed screw spindle which drives in both directions of rotation and runs transversely to the direction of flight of the printing needles.
  • the rotary drive for the screw spindle can consist of an eccentric magnet arranged eccentrically to the screw spindle axis, the magnetic core of which is articulated to a lever which is itself non-rotatably connected to a screw spindle shaft.
  • the back and forth movement of the adjustable mouthpiece is effected in that the lever connected to the magnetic core or to the screw spindle shaft is double-armed and that a tension spring is connected to the second lever arm and is suspended on the base frame of the printhead.
  • a favorable use of space of the available space in the needle printhead can also be achieved if the lifting magnet is arranged approximately parallel to the longitudinal axis of the printhead base frame in the area of the mouthpiece.
  • the movement of the mouthpiece is also facilitated in that the organ to which the mouthpiece is attached consists of a resilient strip.
  • an adjustment of the adjustment path for the mouthpiece can be achieved in that the screw spindle is provided with a screwdriver slot at one free end.
  • the matrix printer according to the invention is provided with only one printing needle column 1, which according to FIG. 1 consists of nine printing needles 2. With normal division of the matrix within the character width 3 or the character height 3a, d. H. The matrix printer writes fast writing in a division into seven parts (matrix 9 x 7). The mouthpiece 6 with the printing needle column 1 is in its zero position in quick writing, in each case in reciprocating printing passes (printing directions).
  • the matrix printer works in an incoming print pass, as described for FIG. 1.
  • the mouthpiece is stiffened by an amount "x and the adjustment involves an electronic change in the matrix division within the character width 3, which roughly corresponds to a doubling of the pressure points within the character" V chosen as an example.
  • the matrix refinement in the direction of the character width is 3 in the sense of the invention selectable and can e.g. B. as shown starting from a matrix 9 x 7 on 18 x 28 or on 18 x 40 or on 36 x 40.
  • FIG. 3 The outline of the wire print head used for this purpose is shown in FIG. 3.
  • the magnetic drive for the individual printing pins 2 are located on the print head base frame 4, which are guided within a housing channel 5 and essentially terminate with the mouthpiece 6.
  • the individual print lines 2 can be recognized as a dot.
  • Each pressure needle 2 is associated with an electromagnet, which is not visible further, with all current leads 7 being combined in a common plug 8.
  • the adjustment drive 10 for the mouthpiece 6, which is enclosed in the housing 11 in FIG. 3, is assigned to the needle printhead according to the invention in the front region 9. Instead of the housing 11, an attachable ribbon guide is shown in FIG. 3a.
  • the adjustment drive 10 is shown in FIG. 3b without the print head base frame 4 and without the housing 11.
  • the mouthpiece 6 (without the pressure needles 2 drawn in the rear region) is held by an organ 12 which transmits the adjustment drive force, this consisting of the lever 13.
  • the lever 13 forms pole faces 13a. 13b, which are opposite to the magnetic poles 14a, 14b of the electromagnet 14.
  • the lever 13 is made of resilient material and is pivotally mounted about the axis 15.
  • the poles 14a. 14b are held by the cross member 16. When a voltage is applied between the magnetic connections 17a, 17b, the magnet 14 pulls the lever 13 into a position in which the pole faces 13a. 13b against the magnetic poles 14a. 14b.
  • the mouthpiece 6 assumes a corresponding position, wherein the adjusting screw 18 can serve either as an adjusting means with respect to the cross member 16 or as a stop in the pivoted-off position of the lever 13.
  • the magnetic poles 14a, 14b can also consist of permanent magnets, the magnetic field of which can be canceled in whole or in part by means of the electromagnet 14.
  • FIGS. 7a and 9a show a two-part mouthpiece 6 consisting of the mouthpiece parts 6a and 6b as an alternative solution.
  • the two mouthpiece parts 6a. 6b by a parallelogram linkage 19 with the joints 19a. 19b, 19c and 19d held together.
  • the pivot axis lies between the mouthpiece parts 6a. 6b.
  • the needle gaps 1 are each formed from nine printing needles 2.
  • the parallelogram linkage 19 is driven by a shaft 20 which is rotatably mounted on the printhead housing 4 in relation to the shaft 20 which is to be described in more detail in FIGS. 7a and 9a.
  • a slight arc movement that occurs when adjusting the parallelogram linkage 19 by the amount “x (distance between two printing needles 2 within a needle gap 1) is negligibly small.
  • the normal position of the mouthpiece parts 6a, 6b shown in FIG. 4a serves for quick writing, which can be written practically twice as fast according to the two existing needle gaps 1 as with the single-column mouthpiece 6 according to FIG. 1. For this reason, the pressure points in the in FIG 4a drawn 18 x 7 matrix drawn black filled.
  • the fine writing shown in FIG. 5a is therefore based on an 18 ⁇ 28 matrix.
  • the needle print head with two adjustable mouthpiece parts 6a and 6b can be designed in several configurations of the adjustment drive 10.
  • FIG. 7 shows the needle printhead according to the invention again with the printhead base frame 4, which has housing cooling fins 4a. with built-in magnetic drives, each for the printing needles 2 with the housing channel 5, in which the printing needles 2 are guided as usual. with the power supply lines 7 for the magnetic drives and with the collecting plug 8 and with the adjusting drive 10 arranged in the front area 9, which is surrounded by the housing 11. In order to also dissipate the heat, cooling air slots 11a are provided in the housing 11.
  • the actuator 10 is shown without the housing 11.
  • the mouthpieces 6a, 6b are adjusted by means of the parallelogram linkage 19 and the shaft 20 mentioned.
  • the intermediate member 21 is attached to the shaft 20 in a rotationally fixed manner. It has pole faces 22a and 22b. which cooperate with flattened cores of the magnetic poles 23a and 24a of the magnets 23 and 24 attached to the print head base frame 4.
  • the intermediate member 21 is designed in the form of a rocker 21a.
  • the needle print head is shown with the print head base frame 4 and without the housing 11 in the front area 9.
  • the two magnets 23 and 24 are arranged vertically with their magnetic core axis.
  • the magnetic poles 23a and 24a lie opposite the pole faces 22a and 22b of the intermediate member 21, which is also designed as a rocker 21a.
  • the movement path of the rocker 21 is set and limited by adjusting screws 25a and 25b arranged in the pole faces 22a and 22b.
  • a projection 26 is fastened to the rocker 21a, which by means of a pair of tension members 27, 28 on those which are not visible. in the space behind the magnets 23 and 24 lie the parallelogram linkage 19 is attached.
  • the exemplary embodiment according to FIG. 9, as far as the print head base frame 4, the housing cooling fins 4a, the housing channel 5, the mouthpiece parts 6a, 6b and the housing 11, the cooling air slots 11a are concerned, has the same design as the embodiments of the invention described above.
  • the flattened areas of the cores of the magnetic poles 23a and 23b are placed in vertical planes (FIG. 9a), and on the shaft 20 the intermediate member 21 is fastened in a rotationally fixed manner and in the form of a pointer 21b.
  • the pointer 21 swings back and forth in the direction of the arrow 29 after a pressure pass has ended, depending on the desired position of the mouthpiece parts 6a, 6b.
  • All of the needle print heads shown in FIGS. 3, 4, 7, 8 and 9 have fastening openings 30 and 31, respectively, through which screws are guided to the print head carriage, not shown, which is moved back and forth in front of the web-shaped recording medium in the print-fitting directions.

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Abstract

1. Matrix printer with a needle print head which is movable in print passes, which is situated in the print position opposite a record carrier movable between print passes, with an adjustable mouthpiece, in which the needles are carried lying one over the other at intervals in bores, whereby a base position of the mouthpiece is provided for speed type, and positions deviating therefrom with print passes moving back and forth are provided for high quality type, characterized in that with the displacement of the mouthpiece (6; 6a, 6b) by partial values of the distance between two successive print needles (2) in a needle gap (1), ie. with a mechanical, finer division of the matrix in the height of the character (3a), at the same time an electronic, finer division of the matrix in the width of the character (3) is associated, whereby the ratio of the division in the height of the character and in the width of the character for speed type and for high quality type in each case amounts to at least 0.4 : 1 or is greater.

Description

Die Erfindung betrifft einen Matrixdrucker mit einem in Druckpässen bewegbaren Nadeldruckkopf, der sich in Druckstellung gegenüber einem zwischen den Druckpässen bewegbaren Aufzeichnungsträger befindet, mit verstellbarem Mundstück, in dem die Nadeln übereinanderliegend mit Abständen in Bohrungen geführt sind, wobei eine Grundstellung des Mundstücks für Schnellschrift und davon abweichende Stellungen bei hin- und hergehenden Druckpässen für Schönschrift vorgesehen sind.The invention relates to a matrix printer with a needle print head which can be moved in print passports and which is located in the print position relative to a record carrier which can be moved between the print passes, with an adjustable mouthpiece in which the needles are guided one above the other at intervals in bores, with a basic position of the mouthpiece for quick writing and the like different positions are provided for reciprocating print passes for fine writing.

Ein derartiger Matrixdrucker dient dem Zweck. unterschiedliche Druckqualitäten der Schriftzeichen bei unterschiedlichen Schreibgeschwindigkeiten zu erzeugen. Im allgemeinen wird ein Matrixdrucker immer nur einer Aufgabe gerecht, nämlich entweder Zeichen mit hoher Geschwindigkeit (aber niederer Druckqualität der Zeichen) oder mit hoher Druckqualität (aber niederer Geschwindigkeit beim Schreiben) auszudrucken.Such a matrix printer serves the purpose. to produce different printing qualities of the characters at different writing speeds. In general, a matrix printer only ever serves one task, namely to print characters either at high speed (but the print quality of the characters is lower) or at high print quality (but the speed of writing is lower).

Es ist bekannt (DE-OS-26 32 293), eine bewegbare vertikale Drucknadelspalte zu einer zweiten feststehenden Drucknadelspalte parallel zu versetzen. Das Versetzen dient der Lösung der Aufgabe, einen Nadeldrucker wahlweise sowohl für das Hochgeschwindigkeitsdrucken als auch für die Zeichenerzeugung hoher Druckqualität auszugestalten.It is known (DE-OS-26 32 293) to offset a movable vertical printing needle column parallel to a second fixed printing needle column. Moving is used to solve the problem of designing a dot matrix printer for high-speed printing as well as for the generation of characters of high print quality.

Für das Schnellschreiben wird hierbei der Versatz mit der Größe Null gewählt, währenddem für das Schönschreiben ein Versatz des Mundstückes größer als Null eingestellt wird.The offset with the size zero is selected for the fast writing, while an offset of the mouthpiece greater than zero is set for the writing.

Folgt man dem Grundgedanken der bekannten Lösung, so stellt man fest, daß lediglich eine Verbesserung der Verhältnisse in Richtung der Nadelspalte eintritt und daß außerdem die Art der Papierweiterschaltung nicht berücksichtigt wird.If one follows the basic idea of the known solution, it is found that only an improvement in the conditions in the direction of the needle gap occurs and that, moreover, the type of paper advance is not taken into account.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, einen Matrixdruckkopf mit zugehörigem Nadeldruckkopf zu schaffen. der den kleinsten Schritt der Papierbewegung nicht auf den halben Nadelabstand bezieht, weil es relativ schwierig ist, das Papier um derart kleine Abstände zu bewegen.The present invention is therefore based on the object of creating a matrix print head with an associated needle print head. which does not relate the smallest step of paper movement to half the needle pitch because it is relatively difficult to move the paper by such small pitches.

Der für Schönschrift bzw. Schnellschrift zu schaffende Druckkopf soll außerdem beliebig einsetzbar sein und soll im übrigen eine Verbesserung hinsichtlich Schnellschrift und/oder Schönschrift erzielen.The printhead to be created for fine writing or quick writing should also be usable as desired and should furthermore improve the quick writing and / or fine writing.

Die gestellte Aufgabe wird dadurch gelöst, daß mit der Verstellung des Mundstücks um Teilwerte des Abstandes zwischen zwei in einer Nadelspalte aufeinanderfolgenden Drucknadeln, d. h. mit einer mechanischen feineren Einteilung der Matrix in Zeichenhöhe zugleich eine elektronische feinere Einteilung der Matrix in Zeichenbreite verbunden ist. wobei das Verhältnis der Einteilung in Zeichenhöhe und in Zeichenbreite für Schnellschrift und für Schönschrift jeweils mindestens 0.4 : 1 beträgt oder größer ist.The object is achieved in that with the adjustment of the mouthpiece by partial values of the distance between two consecutive pressure needles in a needle gap, i. H. with a mechanically finer division of the matrix in character height is also an electronic finer division of the matrix in character width. the ratio of the division in character height and in character width for quick writing and for fine writing is at least 0.4: 1 or greater.

Die Erfindung gestattet demzufolge eine kombinierte Anwendung des Verfahrens. die Matrix sowohl in Nadelspaltenrichtung als auch in Schreibrichtung, quer zur Richtung der Laufbahn des Aufzeichnungsträgers zu verfeinern. Gleichzeitig löst die Erfindung das Problem des Papiervorschubs, der außerhalb der Druckbewegung des Druckkopfes erfolgen kann. Das Papier kann folglich während des Druckens festgehalten werden. Alle diese Einflüsse wirken zusammen. um aufgrund der Erfindungslehre eine schnellere und schönere Schrift in Kombination zu erzeugen. Außerdem ist für Schnell- und Schönschrift nur ein (auswechselbarer) Druckkopf erforderlich. Die elektronische Feineinteilung kann sich im vorliegenden Fall vorzugsweise zweier getrennter Zeichengeneratoren bedienen, wobei die Steuerung (z. B. ein Mikroprozessor mit Programmspeicher) abwechselnd die fein- oder die grobeingeteilten Takte abruft.The invention accordingly allows a combined application of the method. refine the matrix both in the needle column direction and in the writing direction, transverse to the direction of the career of the recording medium. At the same time, the invention solves the problem of paper feed, which can take place outside the print movement of the print head. The paper can thus be held in place during printing. All of these influences work together. to create a faster and more beautiful font in combination based on the theory of the invention. In addition, only one (replaceable) printhead is required for quick and fine writing. In the present case, the electronic fine division can preferably use two separate character generators, with the control system (e.g. a microprocessor with program memory) alternately calling up the finely or roughly divided clocks.

In Ausgestaltung der Erfindung ist vorgesehen. daß bei einem zumindest zweiteiligen Mundstück mit Nadelspalten die Verfeinerung der Matrix von 9 x 7 auf 18 x 40, 18 x 28 oder 36 x 40 vorgenommen ist.An embodiment of the invention is provided. that the refinement of the matrix from 9 x 7 to 18 x 40, 18 x 28 or 36 x 40 is carried out on an at least two-part mouthpiece with needle gaps.

Das weitere Problem der Umgestaltung eines bekannten Nadeldruckkopfes für einen Matrixdrucker, der mit der entsprechenden Anzahl von Drucknadeln ausgerüstet ist, denen jeweils ein Elektromagnet zugeordnet ist, wird nach der weiteren Erfindung dadurch gelöst. daß das verstellbare Mundstück mit einem die Verstellantriebskraft übertragenden Organ verbunden ist und daß dieses Organ unmittelbar oder unter Einschaltung eines Zwischengliedes dem Verstellantrieb zugeordnet ist. Es hat sich gezeigt. daß in derartigen Nadeldruckköpfen gerade noch Raum für dieses Organ, gegebenenfalls für ein Zwischenglied und einen Verstellantrieb vorhanden ist.The further problem of the redesign of a known needle printhead for a matrix printer, which is equipped with the appropriate number of printing needles, each of which is assigned an electromagnet, is solved according to the further invention. that the adjustable mouthpiece is connected to an organ transmitting the adjusting drive force and that this organ is assigned to the adjusting drive directly or with the inclusion of an intermediate member. It has shown. that there is just room for this organ in such needle printheads, possibly for an intermediate member and an adjustment drive.

Diese angestrebte Raumausnutzung bzw. Raumaufteilung für die schmal und leicht zu haltenden Nadeldruckköpfe wird außerdem dadurch unterstützt, daß das die Verstellantriebskraft übertragende Organ, gegebenenfalls das Zwischenglied und der bzw. die Verstellantriebe im vorderen Bereich des Druckkopfes angeordnet und von einem Gehäuse umschlossen sind.This desired use of space or space distribution for the narrow and easy-to-hold needle printheads is also supported by the fact that the organ transmitting the adjustment drive force, possibly the intermediate link and the adjustment drive (s), are arranged in the front area of the print head and are enclosed by a housing.

Eine praktische Ausführungsform für die Antriebsgestaltung besteht dabei darin, daß das die Verstellantriebskraft übertragende Organ aus einem am Druckkopfgrundrahmen gelagerten, schwenkbaren Hebel mit Polflächen besteht, die den Polen eines ein- und ausschaltbaren Magneten gegenüberliegen.A practical embodiment for the drive design consists in the fact that the organ transmitting the adjusting drive force consists of a pivotable lever mounted on the printhead base frame with pole faces which are opposite the poles of a magnet which can be switched on and off.

Einer weitere Alternative für die Gestaltung der Antriebsübertragung ist weiterhin dahingehend vorgeschlagen. daß das die Verstellantriebskraft übertragende Organ aus einer am Druckkopfgrundrahmen drehbar gelagerten Welle besteht. die das Zwischenstück trägt, das mit einander abgewandten Polflächen gegenüber den Magnetpolen zweier einander zugeordneter Magnete angeordnet ist, wobei die Welle mittels eines Parallelogrammlenkergestänges mit zwei Mundstücken verbunden ist.Another alternative for the design of the drive transmission is also proposed to that effect. that the organ transmitting the adjustment drive force consists of a shaft rotatably mounted on the printhead base frame. which carries the intermediate piece, the one with mutually facing pole faces opposite the magnetic poles of two mutually associated Magnets is arranged, the shaft being connected to two mouthpieces by means of a parallelogram linkage.

In weiterer Ausgestaltung der Erfindung ist vorgesehen, das der Verstellantrieb aus einem bzw. aus zwei Elektromagneten besteht.In a further embodiment of the invention it is provided that the adjustment drive consists of one or two electromagnets.

Bei der Anwendung von zwei zusammenwirkenden Elektromagneten ist vorteilhaft, wenn das Zwischenglied in der Form einer Wippe ausgebildet ist.When using two interacting electromagnets, it is advantageous if the intermediate member is designed in the form of a rocker.

Andererseits gestattet die Erfindung auch, daß das Zwischenglied in der Form eines Zeigers ausgebildet ist.On the other hand, the invention also allows the intermediate member to be designed in the form of a pointer.

Eine weitere Ausgestaltung der Erfindung besteht darin, daß sich das mit dem Mundstück verbundene Organ etwa in Richtung des Nadelbündels erstreckt und mittels des Verstellantriebs quer zur Flugrichtung der Drucknadeln um den Bruchteil oder um das Mehrfache eines in Bewegungsrichtung gemessenen Nadelabstandes hin- und herstellbar ist.A further embodiment of the invention is that the organ connected to the mouthpiece extends approximately in the direction of the needle bundle and can be moved back and forth by means of the adjustment drive transversely to the direction of flight of the printing needles by a fraction or a multiple of a needle distance measured in the direction of movement.

Hierbei ergibt sich eine weitere praktische Ausführungsform der Erfindung dadurch, daß der Verstellantrieb für die Hin- und Herstellbewegung des Organs mittels einer in beiden Drehrichtungen antreibenden, quer zur Flugrichtung der Drucknadeln verlaufenden, axial festliegenden Schraubspindel gebildet ist.A further practical embodiment of the invention results from the fact that the adjusting drive for the back and forth movement of the organ is formed by means of an axially fixed screw spindle which drives in both directions of rotation and runs transversely to the direction of flight of the printing needles.

Eine entsprechende Wahl des Gewindes für die Schraubspindel, die keiner allzugroßen Hemmung unterliegen sollte, kann der Drehantrieb für die Schraubspindel aus einem exzentrisch zur Schraubspindelachse angeordneten Hubmagneten bestehen, dessen Magnetkern gelenkig an einen Hebel angeschlossen ist, der selbst mit einem Schraubspindelschaft drehfest verbunden ist.A corresponding choice of thread for the screw spindle, which should not be subject to excessive escapement, the rotary drive for the screw spindle can consist of an eccentric magnet arranged eccentrically to the screw spindle axis, the magnetic core of which is articulated to a lever which is itself non-rotatably connected to a screw spindle shaft.

Die Hin- und Herbewegung des verstellbaren Mundstückes wird dabei dadurch bewirkt, daß der an den Magnetkern bzw. an den Schraubspindelschaft angeschlossene Hebel doppelarmig ist und daß an den zweiten Hebelarm eine Zugfeder angeschlossen ist, die an dem Grundrahmen des Druckkopfes eingehängt ist.The back and forth movement of the adjustable mouthpiece is effected in that the lever connected to the magnetic core or to the screw spindle shaft is double-armed and that a tension spring is connected to the second lever arm and is suspended on the base frame of the printhead.

Eine günstige Raumausnutzung des zur Verfügung stehenden Raumes im Nadeldruckkopf läßt sich hierbei ferner dadurch erzielen, wenn der Hubmagnet etwa parallel zur Längsachse des Druckkopfgrundrahmen im Bereich des Mundstückes angeordnet ist.A favorable use of space of the available space in the needle printhead can also be achieved if the lifting magnet is arranged approximately parallel to the longitudinal axis of the printhead base frame in the area of the mouthpiece.

Die Bewegung des Mundstückes wird außerdem dadurch erleichtert, daß das Organ, an den das Mundstück befestigt ist, aus einem federnden Streifen besteht.The movement of the mouthpiece is also facilitated in that the organ to which the mouthpiece is attached consists of a resilient strip.

Schließlich ist eine Justierung des Verstellweges für das Mundstück derart zu erzielen, indem die Schraubspindel an einem freien Ende mit einem Schraubenzieherschlitz versehen ist.Finally, an adjustment of the adjustment path for the mouthpiece can be achieved in that the screw spindle is provided with a screwdriver slot at one free end.

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

Es zeigenShow it

  • Figur 1 eine Matrix für Schnellschrift mit einer 9-Nadeln-Spalte als 9 x 7-Matrix.Figure 1 is a matrix for quick writing with a 9-needle column as a 9 x 7 matrix.
  • Figur 2 eine Matrix für Schönschrift mit derselben 9-Nadeln-Spalte, die pro Druckpaß verstellbar ist und erfindungsgemäß auf eine 18 x 28-Matrix erweitert ist.Figure 2 shows a matrix for fine writing with the same 9-needle column, which is adjustable per print pass and is expanded according to the invention to an 18 x 28 matrix.
  • Figur 3 ein erstes Ausführungsbeispiel für den erfindungsgemäßen Druckkopf mit verstellbarer Nadelspalte.Figure 3 shows a first embodiment of the print head according to the invention with adjustable needle gap.
  • Figur 3a den Nadeldruckkopf gemäß Fig. 3 ohne das Gehäuse im vorderen Bereich,3a shows the wire print head according to FIG. 3 without the housing in the front area,
  • Figur 3b den vorderen Bereich des Nadeldruckkopfes gemäß Fig. 3, ohne Gehäuse gezeichnet.3b shows the front area of the needle print head according to FIG. 3, drawn without the housing.
  • Figur 4 die beiden verstellbaren Mundstücke für ein 2-Nadelspalten-Mundstück in Grundstellung,FIG. 4 shows the two adjustable mouthpieces for a 2-needle column mouthpiece in the basic position,
  • Figur 4a eine Matrix Schnellschrift mit einer 9-Nadeln-Spalte als 18 x 7-Matrix.Figure 4a is a matrix of quick writing with a 9-needle column as an 18 x 7 matrix.
  • Figur 5 die beiden verstellbaren Mundstücke gemäß Fig. 4 in einer die Spalte verfeinernden Matrix,5 shows the two adjustable mouthpieces according to FIG. 4 in a matrix refining the column,
  • Figur 5a die Matrix für Schönschrift mit verstellter zwei 9-Nadeln-Spaiten und verfeinerter Matrix in Schriftzeichenbreite als 18 x 28-Matrix.Figure 5a, the matrix for fine writing with adjusted two 9-needle spaite and refined matrix in character width as an 18 x 28 matrix.
  • Figur 6 die beiden verstellbaren Mundstücke gemäß Fig. 4 mit verfeinerten Matrix in Schriftzeichenbreite als 36 x 32-Matrix.6 shows the two adjustable mouthpieces according to FIG. 4 with a refined matrix in character width as a 36 x 32 matrix.
  • Figur 6a die in Stellung gemäß Fig. 6 entstehende 36 x 32-Matrix,FIG. 6a shows the 36 x 32 matrix that is created in the position according to FIG. 6,
  • Figur 7 ein zweites Ausführungsbeispiel für den erfindungsgemäßen Druckkopf mit zwei verstellbaren Nadelspalten,FIG. 7 shows a second exemplary embodiment for the print head according to the invention with two adjustable needle gaps,
  • Figur 7a das Antriebssystem für die Nadelspalten-Verstellung gemäß Fig. 7, getrennt gezeichnet,7a shows the drive system for the needle gap adjustment according to FIG. 7, shown separately,
  • Figur 8 ein drittes Ausführungsbeispiel für den erfindungsgemäßen Druckkopf mit zwei verstellbaren Nadelspalten ohne Gehäuse des vorderen Bereichs gezeichnet,FIG. 8 shows a third exemplary embodiment of the print head according to the invention with two adjustable needle gaps without a housing of the front area,
  • Figur 9 ein viertes Ausführungsbeispiel für den erfindungsgemäßen Druckkopf, undFigure 9 shows a fourth embodiment of the printhead according to the invention, and
  • Figur 9a das Antriebssystem für die Nadelspalten-Verstellung gemäß Fig. 9, getrennt gezeichnet.Figure 9a, the drive system for the needle gap adjustment according to FIG. 9, drawn separately.

Der erfindungsgemäße Matrixdrucker ist nach einer ersten Ausführungsform mit nur einer Drucknadelspalte 1 versehen, die gemäß Fig. 1 aus neun Drucknadeln 2 besteht. Bei normaler Einteilung der Matrix innerhalb der Zeichenbreite 3 bzw. der Zeichenhöhe 3a, d. h. einer Einteilung in sieben Teile (Matrix 9 x 7) schreibt der Matrixdrucker Schnellschrift. Das Mundstück 6 mit der Drucknadelspalte 1 steht bei Schnellschrift in seiner Nullstellung, und zwar in jeweils hin- und hergehenden Druckpässen (Druckrichtungen).According to a first embodiment, the matrix printer according to the invention is provided with only one printing needle column 1, which according to FIG. 1 consists of nine printing needles 2. With normal division of the matrix within the character width 3 or the character height 3a, d. H. The matrix printer writes fast writing in a division into seven parts (matrix 9 x 7). The mouthpiece 6 with the printing needle column 1 is in its zero position in quick writing, in each case in reciprocating printing passes (printing directions).

Gemäß Fig. 2 arbeitet der Matrixdrucker in einem hinlaufenden Druckpaß, wie zu Fig. 1 beschrieben. Im zurücklaufenden Druckpaß wird das Mundstück um einen Betrag « x versteift und mit der Verstellung ist eine elektronische Änderung der Matrix-Einteilung innerhalb der Zeichenbreite 3 verbunden, was etwa einer Verdoppelung der Druckpunkte innerhalb des als Beispiel gewählten Zeichens « V gleichkommt.According to FIG. 2, the matrix printer works in an incoming print pass, as described for FIG. 1. In the returning print pass, the mouthpiece is stiffened by an amount "x and the adjustment involves an electronic change in the matrix division within the character width 3, which roughly corresponds to a doubling of the pressure points within the character" V chosen as an example.

Bei der Umstellung von Schnellschrift auf Schönschrift ist die Matrix-Verfeinerung in Richtung der Zeichenbreite 3 im Sinne der Erfindung wählbar und kann z. B. wie dargestellt ausgehend von einer Matrix 9 x 7 auf 18 x 28 oder auf 18 x 40 oder auf 36 x 40 erfolgen.When changing from quick writing to fine writing, the matrix refinement in the direction of the character width is 3 in the sense of the invention selectable and can e.g. B. as shown starting from a matrix 9 x 7 on 18 x 28 or on 18 x 40 or on 36 x 40.

Der hierzu verwendete Nadeldruckkopf ist in seinen Umrissen in Fig. 3 dargestellt. Am Druckkopfgrundrahmen 4 befinden sich wie bekannt die Magnetantriebe für die einzelnen Drucknadein 2. die innerhalb eines Gehäusekanals 5 geführt sind und mit dem Mundstück 6 im wesentlichen abschließen. Die einzelnen Drucknadein 2 sind als Punkt erkennbar. Jeder Drucknadel 2 ist ein weiter nicht sichtbarer Elektromagnet zugeordnet, wobei sämtliche Stromzuführungen 7 in einem Sammelstecker 8 zusammengefäß sind. Dem erfindungsgemäßen Nadeldruckkopf ist im vorderen Bereich 9 der Verstellantrieb 10 für das Mundstück 6 zugeordnet, der in Fig. 3 mit dem Gehäuse 11 umschlossen ist. Anstelle des Gehäuses 11 ist in Fig. 3a eine aufsteckbare Farbbandführung gezeigt.The outline of the wire print head used for this purpose is shown in FIG. 3. As is known, the magnetic drive for the individual printing pins 2 are located on the print head base frame 4, which are guided within a housing channel 5 and essentially terminate with the mouthpiece 6. The individual print lines 2 can be recognized as a dot. Each pressure needle 2 is associated with an electromagnet, which is not visible further, with all current leads 7 being combined in a common plug 8. The adjustment drive 10 for the mouthpiece 6, which is enclosed in the housing 11 in FIG. 3, is assigned to the needle printhead according to the invention in the front region 9. Instead of the housing 11, an attachable ribbon guide is shown in FIG. 3a.

Der Verstellantrieb 10 ist in Fig. 3b ohne den Druckkopfgrundrahmen 4 und ohne das Gehäuse 11 dargestellt. Das Mundstück 6 (ohne die Drucknadeln 2 im rückwärtigen Bereich gezeichnet) wird durch ein die Verstellantriebskraft übertragendes Organ 12 gehalten, wobei dieses aus dem Hebel 13 besteht. Der Hebel 13 bildet Polflächen 13a. 13b, die den Magnetpolen 14a, 14b des Elektromagneten 14 gegenüberliegen. Der Hebel 13 ist aus federndem Werkstoff hergestellt und um die Achse 15 schwenkbar gelagert. Die Pole 14a. 14b werden durch die Traverse 16 gehalten. Bei Anlegen einer Spannung zwischen die Magnetanschlüsse 17a, 17b zieht der Magnet 14 den Hebel 13 in eine Lage, in der die Polflächen 13a. 13b gegen die Magnetpole 14a. 14b anliegen. Das Mundstück 6 nimmt eine entsprechende Lage ein, wobei die Stellschraube 18 entweder als Justiermittel gegenüber der Traverse 16 oder als Anschlag in abgeschwenkter Lage des Hebels 13 dienen kann. Die Magnetpole 14a, 14b können auch aus Permanentmagneten bestehen, deren Magnetfeld ganz oder teilweise mittels des Elektromagneten 14 aufgehoben werden kann.The adjustment drive 10 is shown in FIG. 3b without the print head base frame 4 and without the housing 11. The mouthpiece 6 (without the pressure needles 2 drawn in the rear region) is held by an organ 12 which transmits the adjustment drive force, this consisting of the lever 13. The lever 13 forms pole faces 13a. 13b, which are opposite to the magnetic poles 14a, 14b of the electromagnet 14. The lever 13 is made of resilient material and is pivotally mounted about the axis 15. The poles 14a. 14b are held by the cross member 16. When a voltage is applied between the magnetic connections 17a, 17b, the magnet 14 pulls the lever 13 into a position in which the pole faces 13a. 13b against the magnetic poles 14a. 14b. The mouthpiece 6 assumes a corresponding position, wherein the adjusting screw 18 can serve either as an adjusting means with respect to the cross member 16 or as a stop in the pivoted-off position of the lever 13. The magnetic poles 14a, 14b can also consist of permanent magnets, the magnetic field of which can be canceled in whole or in part by means of the electromagnet 14.

In Fig. 4 ist ein zweiteiliges Mundstück 6 bestehend aus den Mundstückteilen 6a und 6b als Alternativlösung dargestellt. Die beiden Mundstückteile 6a. 6b werden durch ein Parallelogrammlenkergestänge 19 mit den Gelenken 19a. 19b, 19c und 19d zusammengehalten. Die Schwenkachse liegt zwischen den Mundstückteilen 6a. 6b. Die Nadelspalten 1 sind aus jeweils neun Drucknadeln 2 gebildet. Angetrieben wird das Parallelogrammlenkergestänge 19 durch eine zu den in den Figuren 7a und 9a noch genauer zu beschreibende, drehbar am Druckkopfgehäuse 4 gelagerte Welle 20.4 shows a two-part mouthpiece 6 consisting of the mouthpiece parts 6a and 6b as an alternative solution. The two mouthpiece parts 6a. 6b by a parallelogram linkage 19 with the joints 19a. 19b, 19c and 19d held together. The pivot axis lies between the mouthpiece parts 6a. 6b. The needle gaps 1 are each formed from nine printing needles 2. The parallelogram linkage 19 is driven by a shaft 20 which is rotatably mounted on the printhead housing 4 in relation to the shaft 20 which is to be described in more detail in FIGS. 7a and 9a.

Ein beim Verstellen des Parallelogrammlenkergestänges 19 um den Betrag « x (Abstand zwischen zwei Drucknadeln 2 innerhalb einer Nadelspalte 1) auftretende geringe Bogenbewegung ist vernachlässigbar klein.A slight arc movement that occurs when adjusting the parallelogram linkage 19 by the amount “x (distance between two printing needles 2 within a needle gap 1) is negligibly small.

Die in Fig. 4a gezeichnete Normalstellung der Mundstückteile 6a, 6b dient für Schnellschrift, die entsprechend der zwei vorhandenen Nadelspalten 1 praktisch doppelt so schnell geschrieben werden kann wie mit dem einspaltigen Mundstück 6 gemäß Fig 1. Aus diesem Grund sind die Druckpunkte in der in Fig. 4a gezeichneten 18 x 7-Matrix schwarz ausgefüllt gezeichnet.The normal position of the mouthpiece parts 6a, 6b shown in FIG. 4a serves for quick writing, which can be written practically twice as fast according to the two existing needle gaps 1 as with the single-column mouthpiece 6 according to FIG. 1. For this reason, the pressure points in the in FIG 4a drawn 18 x 7 matrix drawn black filled.

Eine Verstellung der Mundstückteile 6a und 6b gemäß Fig. 5 um den Betrag x/2 (in Fig. 5 übertrieben dargestellt) erfolgt durch Hin- und Herdrehen der Welle 20. die an dem Parallelogrammlenkergestänge 19 angreift. Das Drehen erfolgt nach jedem Druckpaß und etwa in der Zeit, in der der Vorschub des Aufzeichnungsträgers. d. h. der Papierbahn, erfolgt.An adjustment of the mouthpiece parts 6a and 6b according to FIG. 5 by the amount x / 2 (exaggeratedly shown in FIG. 5) is carried out by turning the shaft 20 back and forth, which engages the parallelogram linkage 19. The rotation takes place after each print pass and approximately in the time in which the recording medium is fed. d. H. the paper web.

Der in Fig. 5a dargestellten Schönschrift liegt demzufolge eine 18 x 28-Matrix zugrunde.The fine writing shown in FIG. 5a is therefore based on an 18 × 28 matrix.

Die Verstellung der Mundstücke 6a bzw. 6b gemäß Fig. 6 erfolgt um einen gegenüber x,2 zusätzlichen Betrag von x/4. wodurch sich eine 28 x 36-Matrix ergibt. Das Ergebnis ist eine schön geschriebene und verhältnismäßig auch schnell geschriebene Schrift ohne größeren Aufwand an Feinmechanik und Elektronik mit einem einzigen Nadeldruckkopf.6 is adjusted by an additional amount of x / 4 compared to x, 2. which results in a 28 x 36 matrix. The result is a beautifully written and relatively quickly written font with no great effort in precision engineering and electronics with a single needle print head.

Der Nadeldruckkopf mit zwei verstellbaren Mundstückteilen 6a und 6b kann in mehreren Gestaltungen des Verstellantriebs 10 ausgeführt sein.The needle print head with two adjustable mouthpiece parts 6a and 6b can be designed in several configurations of the adjustment drive 10.

Fig. 7 zeigt den erfindungsgemäßen Nadeldruckkopf wieder mit dem Druckkopfgrundrahmen 4, das Gehäusekühlrippen 4a aufweist. mit eingebauten Magnetantrieben, die jeweils für die Drucknadeln 2 mit dem Gehäusekanal 5, in dem die Drucknadeln 2 wie üblich geführt sind. mit den Stromzuführungen 7 für die Magnetantriebe und mit dem Sammelstecker 8 sowie mit dem im vorderen Bereich 9 angeordneten Verstellantrieb 10, der vom Gehäuse 11 umgeben wird. Um auch die Wärme abzuführen, sind im Gehäuse 11 Kühlluftschlitze 11a vorgesehen.7 shows the needle printhead according to the invention again with the printhead base frame 4, which has housing cooling fins 4a. with built-in magnetic drives, each for the printing needles 2 with the housing channel 5, in which the printing needles 2 are guided as usual. with the power supply lines 7 for the magnetic drives and with the collecting plug 8 and with the adjusting drive 10 arranged in the front area 9, which is surrounded by the housing 11. In order to also dissipate the heat, cooling air slots 11a are provided in the housing 11.

In Fig.7a ist der Verstellantrieb 10 ohne das Gehäuse 11 dargestellt. Die Mundstücke 6a, 6b werden mittels des erwähnten Parallelogrammlenkergestänges 19 und der Welle 20 verstellt. An der Welle 20 ist das Zwischenglied 21 drehfest angebracht. Es weist Polflächen 22a und 22b auf. die mit abgeflachten Kernen der Magnetpole 23a und 24a der am Druckkopfgrundrahmen 4 befestigten Magnete 23 und 24 zusammenwirken. Hierbei ist das Zwischenglied 21 in der Form einer Wippe 21a ausgebildet.In Figure 7a, the actuator 10 is shown without the housing 11. The mouthpieces 6a, 6b are adjusted by means of the parallelogram linkage 19 and the shaft 20 mentioned. The intermediate member 21 is attached to the shaft 20 in a rotationally fixed manner. It has pole faces 22a and 22b. which cooperate with flattened cores of the magnetic poles 23a and 24a of the magnets 23 and 24 attached to the print head base frame 4. Here, the intermediate member 21 is designed in the form of a rocker 21a.

Beim Ausführungsbeispiel der Fig. 8 ist der Nadeldruckkopf mit dem Druckkopfgrundrahmen 4 und ohne das Gehäuse 11 im vorderen Bereich 9 dargestellt. Die beiden Magnete 23 und 24 sind mit ihrer Magnetkernachse vertikal angeordnet. Die Magnetpole 23a und 24a liegen den Polflächen 22a und 22b des Zwischengliedes 21 gegenüber, das ebenfalls als Wippe 21a gestaltet ist. Der Bewegungsweg der Wippe 21 wird durch in den Polflächen 22a und 22b angeordnete Stellschrauben 25a und 25b eingestellt und begrenzt. An der Wippe 21a ist ein Vorsprung 26 befestigt, der mittels eines Zuggliederpaares 27. 28 an den weiter nicht sichtbaren. im Zwischenraum hinter den Magneten 23 und 24 liegenden Parallelogrammlenkergestänge 19 befestigt ist.In the embodiment of FIG. 8, the needle print head is shown with the print head base frame 4 and without the housing 11 in the front area 9. The two magnets 23 and 24 are arranged vertically with their magnetic core axis. The magnetic poles 23a and 24a lie opposite the pole faces 22a and 22b of the intermediate member 21, which is also designed as a rocker 21a. The movement path of the rocker 21 is set and limited by adjusting screws 25a and 25b arranged in the pole faces 22a and 22b. A projection 26 is fastened to the rocker 21a, which by means of a pair of tension members 27, 28 on those which are not visible. in the space behind the magnets 23 and 24 lie the parallelogram linkage 19 is attached.

Das Ausführungsbeispiel gemäß Fig. 9 ist im Prinzip, was den Druckkopfgrundrahmen 4, die Gehäusekühlrippen 4a, den Gehäusekanal 5, die Mundstückteile 6a, 6b sowie das Gehäuse 11, die Kühlluftschlitze 11a betrifft, gleich ausgebildet wie die vorstehend beschriebenen Ausführungsformen der Erfindung. Gegenüber dem Ausführungsbeispiel gemäß Fig. 7a sind jedoch die Abflachungen der Kerne der Magnetpole 23a und 23b in vertikale Ebenen gelegt (Fig. 9a), und auf der Welle 20 ist das Zwischenglied 21 drehfest befestigt und in der Form eines Zeigers 21 b ausgebildet. Der Zeiger 21 schwingt nach Beendigung eines Druckpasses je nach der gewünschten Stellung der Mundstückteile 6a, 6b in Pfeilrichtung 29 hin und her.In principle, the exemplary embodiment according to FIG. 9, as far as the print head base frame 4, the housing cooling fins 4a, the housing channel 5, the mouthpiece parts 6a, 6b and the housing 11, the cooling air slots 11a are concerned, has the same design as the embodiments of the invention described above. Compared to the exemplary embodiment according to FIG. 7a, however, the flattened areas of the cores of the magnetic poles 23a and 23b are placed in vertical planes (FIG. 9a), and on the shaft 20 the intermediate member 21 is fastened in a rotationally fixed manner and in the form of a pointer 21b. The pointer 21 swings back and forth in the direction of the arrow 29 after a pressure pass has ended, depending on the desired position of the mouthpiece parts 6a, 6b.

Sämtliche dargestellte Nadeldruckköpfe der Figuren 3, 4, 7, 8 und 9 weisen Befestigungsöffnungen 30 bzw. 31 auf, durch die Schrauben zum weiter nicht dargestellten Druckkopfschlitten, der vor dem bahnförmigen Aufzeichnungsträger in den Druckpaßrichtungen hin- und herbewegt wird, geführt sind.All of the needle print heads shown in FIGS. 3, 4, 7, 8 and 9 have fastening openings 30 and 31, respectively, through which screws are guided to the print head carriage, not shown, which is moved back and forth in front of the web-shaped recording medium in the print-fitting directions.

Claims (16)

1. Matrix printer with a needle print head which is movable in print passes, which is situated in the print position opposite a record carrier movable between print passes, with an adjustable mouthpiece, in which the needles are carried lying one over the other at intervals in bores. whereby a base position of the mouthpiece is provided for speed type, and positions deviating therefrom with print passes moving back and forth are provided for high quality type, characterized in that with the displacement of the mouthpiece (6 ; 6a, 6b) by partial values of the distance between two successive print needles (2) in a needle gap (1). ie. with a mechanical. finer division of the matrix in the height of the character (3a). at the same time an electronic, finer division of the matrix in the width of the character (3) is associated, whereby the ratio of the division in the height of the character and in the width of the character for speed type and for high quality type in each case amounts to at least 0.4 : 1 or is greater.
2. Matrix printer according to Claim 1, characterized in that with a mouthpiece having at least two parts (6a. 6b) with two needle gaps (1) the refinement of the matrix is carried out from 9 x 7 to 18 x 28, 18 x 40 or 36 x 40.
3. Needle print head for a matrix printer according to Claims 1 and 2, characterized in that the adjustable mouthpiece (6) is connected with a member (12) which transfers the adjustment drive force, and that this member (12) is directly associated with the adjustment drive (10) or is associated therewith with the interposition of an intermediate piece (21).
4. Needle print head according to Claim 3. characterized in that the member (12) transferring the adjustment drive force, if applicable the intermediate piece (21) and the adjustment drive or drives (10) are arranged in the front region (9) of the print head and are surrounded by a housing (11
5. Needle print head according to Claims 3 and 4. characterized in that the member (12) transferring the adjustment drive force consists of a pivotable lever (13) mounted on the print head base frame (4) and with polar surfaces (13a. 13b), which lie opposite the poles (14a, 14b) of a magnet (14) which is able to be cut in and out.
6. Needle print head according to Claims 3 and 4. characterized in that the member (12) transferring the adjustment drive force consists of a shaft (20) rotatably mounted on the print head base frame (4), which shaft carries the intermediate piece (21), which is arranged with polar surfaces (22a. 22b) facing away from each other opposite the magnet poles (23a. 24a) of two magnets (23. 24) which are associated with each other, whereby the shaft (20) is connected with two mouthpieces (6a, 6b) by means of parallelogram tie rods (19).
7. Needle print head according to Claims 3 to 6. characterized in that the adjustment drive (10) consists of one or respectively of two electromagnets (14 resp. 23, 24).
8. Needle print head according to Claims 3 to 6, characterized in that the intermediate piece (21) is constructed in the form of a counterpoise (21 a) (Fig. 7a and 8).
9. Needle print head according to Claims 3 to 6, characterized in that the intermediate piece (21) is constructed in the form of a pointer (21 b) (Fig. 9a).
10. Needle print head according to Claims 3 and 4, characterized in that the member (12). which is connected with the mouthpiece (6). extends approximately in the direction of the bunch of needles and by means of the adjustment drive (10) is able to be moved back and forth transversely to the direction of flight of the print needles (2) by the fraction or by the multiple of a needle space measured in the direction of motion.
11. Needle print head according to Claim 10, characterized in that the adjustment drive (10) for the back and forth adjustment movement of the member (12) is formed by means of an axially fixed screw spindle which is able to be driven in both directions of rotation and runs transversely to the direction of flight of the print needles (2).
12. Needle print head according to Claims 10 to 11, characterized in that the rotational drive for the screw spindle consists of a lifting magnet eccentrically arranged to the screw spindle axis, the magnet core of which magnet is articulatedly connected to a lever, which itself is connected with a screw spindle shaft so as to be fixed with respect to torsion.
13. Needle print head according to Claims 10 to 12, characterized in that the lever. which is connected to the magnet core or respectively to the screw spindle shaft. is double-armed and that a tension spring is connected to the second lever arm, which spring is suspended on the base frame (4) of the print head.
14. Needle print head according to Claims 10 to 13, characterized in that the lifting magnet is arranged approximately parallel to the longitudinal axis of the print head base frame (4) in the region of the mouthpiece (6).
15. Needle print head according to Claims 10 to 14, characterized in that the member (12) to which the mouthpiece (6) is attached, consists of an elastic strip.
16. Needle print head according to Claims 10 to 15, characterized in that the screw spindle is provided on a free end with a screw-driver slot.
EP81730090A 1980-11-06 1981-09-09 Matrix printer and wire print head therefor Expired EP0052066B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3041877 1980-11-06
DE19803041877 DE3041877A1 (en) 1980-11-06 1980-11-06 MATRIX PRINTER AND RELATED NEEDLE PRINT HEAD

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EP0052066A2 EP0052066A2 (en) 1982-05-19
EP0052066A3 EP0052066A3 (en) 1983-03-09
EP0052066B1 true EP0052066B1 (en) 1986-06-18

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Also Published As

Publication number Publication date
DE3041877A1 (en) 1982-05-13
EP0052066A3 (en) 1983-03-09
US4929103A (en) 1990-05-29
JPS57102370A (en) 1982-06-25
JPH0419033B2 (en) 1992-03-30
EP0052066A2 (en) 1982-05-19

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