EP0075342B1 - Shiftable printhead - Google Patents

Shiftable printhead Download PDF

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Publication number
EP0075342B1
EP0075342B1 EP82201043A EP82201043A EP0075342B1 EP 0075342 B1 EP0075342 B1 EP 0075342B1 EP 82201043 A EP82201043 A EP 82201043A EP 82201043 A EP82201043 A EP 82201043A EP 0075342 B1 EP0075342 B1 EP 0075342B1
Authority
EP
European Patent Office
Prior art keywords
needles
recesses
parts
parallel
faces
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
EP82201043A
Other languages
German (de)
French (fr)
Other versions
EP0075342A3 (en
EP0075342A2 (en
Inventor
Stéphane Rossopoulos
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.)
Cessione precisa Sa
Original Assignee
Hermes Precisa International SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hermes Precisa International SA filed Critical Hermes Precisa International SA
Publication of EP0075342A2 publication Critical patent/EP0075342A2/en
Publication of EP0075342A3 publication Critical patent/EP0075342A3/en
Application granted granted Critical
Publication of EP0075342B1 publication Critical patent/EP0075342B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • 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

  • Switchable needle writing heads comprising at least two rows of needles, these needles being slidably mounted in guide paths in a support in two parts, these rows being arranged substantially vertically with respect to the direction d writing a line by the head, means allowing at will to produce a relative displacement between the two parts of the support to align the positions of the needles of one row relative to the positions of the needles of another row parallel to the writing direction, or shift these positions between the two rows (see patent USA-A-4,010,835).
  • the object of the present invention is to provide a needle head of this type, the construction of which is very precise while being simple to produce.
  • the object is achieved by means of the writing head defined in claim 1.
  • the writing head shown comprises a support 1 formed by two parts 2 and 3, the part 2 being integral with the writing head which is not shown, because it is well known in itself.
  • Part 3 is slidably mounted on part 2.
  • This support has guide paths for two rows of needles, these paths being produced in an industrial ruby 4 which is shown on a larger scale in FIG. 3 and which comprises a fixed part 5 and a mobile part 6, the latter being mounted on the sliding part 3.
  • Part 3 is guided on part 2 by two tabs 7 and 8 of part 2, which are engaged in two recesses 9 and 10 of part 3.
  • the latter also carries a finger 11 intended to control its movement relative to in part 2.
  • the part 5 of the ruby 4 is itself made up of two parts 12 and 13 assembled by gluing 14.
  • Piece 5 has a series of nine parallel recesses 15 of substantially semi-circular section and constituting guide paths for the needles 16 of a first row of needles.
  • the part 13 also has a series of parallel recesses 17 arranged opposite the recesses 15, the section of which is arcuate so as to match the circular section of the needles 16, while leaving a play of a few hundredths of a millimeter to allow free sliding of the needles 16 in their respective guide paths.
  • Guide paths are provided between the part 13 and the part 3 to receive a second row of needles 18.
  • the needles of this second row can be moved vertically as a block with reference to FIG. 3 to be moved so as to be offset relative to the needles 16 of the first row, taking account of the writing direction A.
  • the needles 18 can be brought into a position aligned with the needles 16 in the direction A.
  • a rapid writing position is obtained when the needles 16 and 18 are aligned, since it is possible on the same line to carry out per unit of time, a double number of stitches than in the case where there is only one row of needles.
  • the writing speed remains the same as if there was only one row of needles, but the quality is better since it is possible to obtain an overlap points drawn by the needles and therefore to make continuous lines.
  • the two respective positions between parts 2 and 3 of the support are fixed by notching means made between parts 5 and 6 of the ruby 4.
  • These means are constituted by two groups and two grooves 19, 20, 21 and 22 parallel to each other and parallel to the recesses 15.
  • the bottoms of the grooves 19 and 20 and respectively 21 and 22 are spaced from each other by a value equal to half the spacing between the axes of the recesses 15.
  • Each group of two grooves is arranged opposite a groove 23, respectively 24, substantially semi-circular, of the same radius as that of the recesses 15 and serving as a housing for a rod 25, respectively 26.
  • These rods are glued in the grooves 23 and 24 and have a diameter corresponding to that of the needles 16 and 18, increased by the clearance provided to allow the latter to slide freely.
  • part 3 of the support is biased towards part 5 of the ruby by a leaf spring 27 bearing against a boss 28 of part 3 and whose free ends are supported in housings 29 and 30. The action of this spring pushes rods 25 and 26 against the bottom of grooves 19 to 22.
  • the writing head In needle printers, it is usual for the writing head to move along a cylinder on which the writing sheet is placed, this movement being limited at each of its ends by stops fixing the line margins of writings. This arrangement can be used to place the mobile row comprising the needles 18.
  • the means of displacement and notching of the part 3 can be varied to a great extent, the displacements of the mobile part 3 can for example be controlled by an electromagnet fixed on the writing head.

Description

On connaît déjà des têtes d'écriture commutables à aiguilles, comprenant au moins deux rangées d'aiguilles, ces aiguilles étant montées coulissantes dans des chemins de guidage dans un support en deux parties, ces rangées étant disposées sensiblement verticalement par rapport à la direction d'écriture d'une ligne par la tête, des moyens permettant à volonté de produire un déplacement relatif entre les deux parties du support pour aligner les positions des aiguilles d'une rangée par rapport aux positions des aiguilles d'une autre rangée parallèlement à la direction d'écriture, ou décaler ces positions entre les deux rangées (voir brevet USA-A-4.010.835).Switchable needle writing heads are already known, comprising at least two rows of needles, these needles being slidably mounted in guide paths in a support in two parts, these rows being arranged substantially vertically with respect to the direction d writing a line by the head, means allowing at will to produce a relative displacement between the two parts of the support to align the positions of the needles of one row relative to the positions of the needles of another row parallel to the writing direction, or shift these positions between the two rows (see patent USA-A-4,010,835).

Le but de la présente invention est de fournir une tête à aiguilles de ce type, dont la construction est très précise tout en étant simple à réaliser. Le but est atteint grâce à la tête d'écriture de- finie à la revendication 1.The object of the present invention is to provide a needle head of this type, the construction of which is very precise while being simple to produce. The object is achieved by means of the writing head defined in claim 1.

Il est à remarquer toutefois qu'une tête d'écriture comprenant un support en deux parties présentant deux faces disposées en regard l'une de l'autre, l'une de ces faces présentant des creusures parallèles entre elles et de section sensiblement semi-circulaires, d'un rayon correspondant à celui des aiguilles et permettant à ces dernières de coulisser librement, les aiguilles d'une rangée étant placées dans ces creusures et retenues dans ces dernières par une portion en creux de l'autre partie, cette portion en creux présentant une longueur sensiblement égale à longueur de cette rangée d'aiguilles, est déjà connue (voir FR-A-2071162, DE-A-2729495, US-A-3833105). Toutefois les têtes d'écriture décrites dans ces brevets ne sont pas commutables. Le dessin annexé représente schématiquement et à titre d'example, une forme d'exécution de la tête d'écriture objet de l'invention.

  • La figure 1 est une vue de la face active de la tête d'écriture.
  • La figure 2 est une coupe selon la ligne II-II de la figure 1.
  • La figure 3 est une vue à plus grande échelle du support présentant les chemins de guidage des aiguilles.
It should be noted however that a writing head comprising a support in two parts having two faces arranged opposite one another, one of these faces having recesses parallel to each other and of substantially semi-section circular, with a radius corresponding to that of the needles and allowing the latter to slide freely, the needles of a row being placed in these recesses and retained in the latter by a hollow portion of the other part, this portion in hollow having a length substantially equal to the length of this row of needles, is already known (see FR-A-2071162, DE-A-2729495, US-A-3833105). However, the writing heads described in these patents are not switchable. The accompanying drawing shows schematically and by way of example, an embodiment of the writing head object of the invention.
  • Figure 1 is a view of the active face of the writing head.
  • Figure 2 is a section along line II-II of Figure 1.
  • Figure 3 is an enlarged view of the support having the needle guide paths.

La tête d'écriture représentée comprend un support 1 formé de deux parties 2 et 3, la partie 2 étant solidaire de la tête d'écriture qui n'est pas représentée, car elle est bien connue en elle même. La partie 3 est montée coulissante sur la partie 2.The writing head shown comprises a support 1 formed by two parts 2 and 3, the part 2 being integral with the writing head which is not shown, because it is well known in itself. Part 3 is slidably mounted on part 2.

Ce support présente des chemins de guidage pour deux rangées d'aiguilles, ces chemins étant réalisés dans un rubis industriel 4 qui est représenté à plus grande échelle à la figure 3 et qui comprend une partie fixe 5 et une partie mobile 6, cette dernière étant montée sur la partie coulissante 3.This support has guide paths for two rows of needles, these paths being produced in an industrial ruby 4 which is shown on a larger scale in FIG. 3 and which comprises a fixed part 5 and a mobile part 6, the latter being mounted on the sliding part 3.

Le guidage de la partie 3 sur la partie 2 est assurée par deux languettes 7 et 8 de la partie 2, qui sont engagées dans deux évidements 9 et 10 de la partie 3. Cette dernière porte encore un doigt 11 destiné commander son déplacement par rapport à la partie 2.Part 3 is guided on part 2 by two tabs 7 and 8 of part 2, which are engaged in two recesses 9 and 10 of part 3. The latter also carries a finger 11 intended to control its movement relative to in part 2.

Comme le montre la figure 3, la partie 5 du rubis 4 est elle-même constituée en deux pièces 12 et 13 assemblées par collage 14.As shown in FIG. 3, the part 5 of the ruby 4 is itself made up of two parts 12 and 13 assembled by gluing 14.

La pièce 5 présente une série de neuf creusures parallèles 15 de section sensiblement semi-circulaire et constituant des chemins de guidage pour les aiguilles 16 d'une première rangée d'aiguilles.Piece 5 has a series of nine parallel recesses 15 of substantially semi-circular section and constituting guide paths for the needles 16 of a first row of needles.

La pièce 13 présente également une série de creusures parallèles 17 disposées en regard des creusures 15, dont la section est arquée de façon à épouser la section circulaire des aiguilles 16, tout en laissant un jeu de quelques centièmes de millimètres pour permettre un libre coulissement des aiguilles 16 dans leur chemin de guidage respectif.The part 13 also has a series of parallel recesses 17 arranged opposite the recesses 15, the section of which is arcuate so as to match the circular section of the needles 16, while leaving a play of a few hundredths of a millimeter to allow free sliding of the needles 16 in their respective guide paths.

Des chemins de guidage sont ménagés entre la pièce 13 et la partie 3 pour recevoir une seconde rangée d'aiguilles 18. Les aiguilles de cette seconde rangée peuvent être déplacées en bloc verticalement en référence à la figure 3 pour être déplacées de façon à être décalées par rapport aux aiguilles 16 de la première rangée, en tenant compte de la direction d'écriture A. Par un déplacement de la partie 3 vers le bas, sur une distance correspondant à la moitié du pas des aiguilles 16, c'est-à-dire de la distance entre les axes de deux aiguilles contigues, les aiguilles 18 peuvent être amenées dans une position alignée avec les aiguilles 16 dans la direction A. Comme cela est bien connu, on obtient une position d'écriture rapide lorsque les aiguilles 16 et 18 sont alignées, puisqu'il est possible sur une même ligne d'effectuer par unité de temps, un nombre de points double que dans le cas où on ne dispose que d'une seule rangée d'aiguilles.Guide paths are provided between the part 13 and the part 3 to receive a second row of needles 18. The needles of this second row can be moved vertically as a block with reference to FIG. 3 to be moved so as to be offset relative to the needles 16 of the first row, taking account of the writing direction A. By a displacement of the part 3 downwards, over a distance corresponding to half the pitch of the needles 16, that is to say -to say the distance between the axes of two adjoining needles, the needles 18 can be brought into a position aligned with the needles 16 in the direction A. As is well known, a rapid writing position is obtained when the needles 16 and 18 are aligned, since it is possible on the same line to carry out per unit of time, a double number of stitches than in the case where there is only one row of needles.

Dans la position décalée des aiguilles 16 et 18, la vitesse d'écriture reste la même que si l'on n'avait qu'une seule rangée d'aiguilles, mais la qualité est meilleure puisqu'il est possible d'obtenir un recouvrement des points tracés par les aiguilles et donc de réaliser des traits continus.In the offset position of needles 16 and 18, the writing speed remains the same as if there was only one row of needles, but the quality is better since it is possible to obtain an overlap points drawn by the needles and therefore to make continuous lines.

Les deux positions respectives entre les partie 2 et 3 du support sont fixées par des moyens de crantage réalisés entre les parties 5 et 6 du rubis 4. Ces moyens sont constitués par deux groupes e deux rainures 19, 20, 21 et 22 parallèles entre elles et parallèles aux creusures 15. Les fonds des rainures 19 et 20 et respectivement 21 et 22 sont distants l'un de l'autre d'une valeur égale à la moitié de l'espacement entre les axes des creusures 15. Chaque groupe de deux rainures est disposé en regard d'une rainure 23, respectivement 24, sensiblement semi-circulaire, de même rayon que celui des creusures 15 et servant de logement à une tige 25, respectivement 26. Ces tiges sont collées dans les rainures 23 et 24 et présentent un diamètre correspondant à celui des aiguilles 16 et 18, augmenté du jeu prévu pour permettre le coulissement libre de ces dernières.The two respective positions between parts 2 and 3 of the support are fixed by notching means made between parts 5 and 6 of the ruby 4. These means are constituted by two groups and two grooves 19, 20, 21 and 22 parallel to each other and parallel to the recesses 15. The bottoms of the grooves 19 and 20 and respectively 21 and 22 are spaced from each other by a value equal to half the spacing between the axes of the recesses 15. Each group of two grooves is arranged opposite a groove 23, respectively 24, substantially semi-circular, of the same radius as that of the recesses 15 and serving as a housing for a rod 25, respectively 26. These rods are glued in the grooves 23 and 24 and have a diameter corresponding to that of the needles 16 and 18, increased by the clearance provided to allow the latter to slide freely.

En référence à la figure 1, la partie 3 du support est sollicitée en direction de la partie 5 du rubis par un ressort à lames 27 prenant appui contre un bossage 28 de la partie 3 et dont les extrémités libres s'appuient dans des logements 29 et 30. L'action de ce ressort exerce une poussée des tiges 25 et 26 contre le fond des rainures 19 à 22.Referring to Figure 1, part 3 of the support is biased towards part 5 of the ruby by a leaf spring 27 bearing against a boss 28 of part 3 and whose free ends are supported in housings 29 and 30. The action of this spring pushes rods 25 and 26 against the bottom of grooves 19 to 22.

Dans les imprimantes à aiguilles, il est habituel que la tête d'écriture se déplace le long d'un cylindre sur lequel est placée la feuille d'écriture, ce déplacement étant limité à chacune de ses extrémités par des butées fixant les marges des lignes d'écritures. Cette disposition peut être utilisée pour effectuer la mise en place de la rangée mobile comprenant les aiguilles 18.In needle printers, it is usual for the writing head to move along a cylinder on which the writing sheet is placed, this movement being limited at each of its ends by stops fixing the line margins of writings. This arrangement can be used to place the mobile row comprising the needles 18.

A cet effet, il suffit d'utiliser le dispositif habituel de dépassement des marges pour amener le doigt 11 en contact avec l'une ou l'autre des deux rampes 31 et respectivement 32 disposées à chaque bout de la ligne d'écriture. La coopération du doigt 11 avec la rampe 32 amène la partie 3 en position haute, tandis que sa coopération avec la rampe 31 l'amène en position basse.For this purpose, it suffices to use the usual device for exceeding the margins to bring the finger 11 into contact with one or the other of the two ramps 31 and 32 respectively disposed at each end of the writing line. The cooperation of the finger 11 with the ramp 32 brings the part 3 in the high position, while its cooperation with the ramp 31 brings it in the low position.

On peut bien entendu apporter de nombreuses modifications à la tête d'écriture décrite. En particulier, on pourrait prévoir plus de deux rangées d'aiguilles, les déplacements verticaux des rangées mobiles étant d'autant plus faibles que le nombre de rangées est élevé.It is of course possible to make numerous modifications to the writing head described. In particular, more than two rows of needles could be provided, the vertical displacements of the movable rows being all the smaller the higher the number of rows.

Les moyens de déplacement et de crantage de la partie 3 peuvent être variés dans une grande mesure, les déplacements de la partie mobile 3 pouvant par exemple être commandés par un électroaimant fixé sur la tête d'écriture.The means of displacement and notching of the part 3 can be varied to a great extent, the displacements of the mobile part 3 can for example be controlled by an electromagnet fixed on the writing head.

Claims (4)

1. Interchangeable needle writing head, comprising at least two rows of needles (16, 18) these needles being mounted to slide in guide paths (15, 17) in a support with at least two parts (5, 6), these rows being placed approximately vertically in relation to the direction of writing of a line by the head, means (11) making it possible at will to produce a relative movement between at least two parts of the support to align the positions of the needles (16) of one row in relation to the positions of the needles (18) of another row parallel to the direction of writing, or to stagger these positions between the two rows, characterized in that the two parts (5, 6) of the support exhibit two faces located opposite each other, one of these faces exhibiting a first series of recesses (15) parallel to each other and of approximately semicircular section, with a radius corresponding to that of the needles and making it possible for the latter to slide freely, the needles (18) of one row being placed in these recesses and held in the latter by a second series of parallel recesses in the other part facing the first part said second series extending over a length approximately equal to the length of this row of needles.
2. Head according to claim 1, characterized in that the two parts (5, 6) of the support are pulled toward each other by at least a spring (27) stretching to apply said faces against one another, notching means (19 to 26) being provided between these two faces to determine the two operating positions.
3. Head according to claim 2, characterized in that the notching means (19 to 26) consist of two groups of two grooves (19 to 22) parallel to each other and parallel to said recesses (15), the bottoms of the grooves of one group being separated from one another by a value equal to one-half of the space between the axes of the semicircular recesses, each of the groups of two grooves (19 to 22) being located opposite a groove (23, 24) of an approximately semicircular section, with the same radius as that of the recesses (15), a rod (25, 26) with a diameter corresponding to that of the needles (18), increased by the play provided to make the free sliding of the latter possible, being housed in each groove (23, 24) of semicircular section.
4. Head according to claim 3, characterized in that the support consists of rubies (4) and is formed in three parts (12, 13, 6) of which two (12, 13) are held firmly together and exhibit two faces opposite one another, each of the two faces ex- hibitingrecesses (15,17)parallel to each other and with a semicircular section of the same size as the recesses provided in a face of the two parts (13,6), movable in relation to one another.
EP82201043A 1981-09-18 1982-08-19 Shiftable printhead Expired EP0075342B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH603881A CH644307A5 (en) 1981-09-18 1981-09-18 SWITCHABLE WRITING HEAD.
CH6038/81 1981-09-18

Publications (3)

Publication Number Publication Date
EP0075342A2 EP0075342A2 (en) 1983-03-30
EP0075342A3 EP0075342A3 (en) 1984-03-28
EP0075342B1 true EP0075342B1 (en) 1986-05-14

Family

ID=4303227

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82201043A Expired EP0075342B1 (en) 1981-09-18 1982-08-19 Shiftable printhead

Country Status (5)

Country Link
US (1) US4470713A (en)
EP (1) EP0075342B1 (en)
JP (1) JPS5862071A (en)
CH (1) CH644307A5 (en)
DE (1) DE3271153D1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3333252C2 (en) * 1983-09-14 1986-02-13 Nixdorf Computer Ag, 4790 Paderborn Process for the production of a dot matrix print head
IT1176859B (en) * 1984-10-05 1987-08-18 Honeywell Inf Systems NEEDLE AND NEEDLE GUIDE UNIT FOR NEEDLE PRINTER HEAD
CH667618A5 (en) * 1986-03-21 1988-10-31 Hermes Precisa International SWITCHABLE WRITING HEAD.
IT1247770B (en) * 1990-10-31 1994-12-30 Microlys Spa DOT MATRIX PRINT HEAD FOR HIGH DEFINITION OR HIGH SPEED PRINTING
US5880757A (en) * 1991-11-04 1999-03-09 Hewlett-Packard Company Print resolution enhancement by adjusting printhead position
JP2522231B2 (en) * 1991-11-15 1996-08-07 株式会社精工舎 Wire dot printer with switchable printing modes
SG44608A1 (en) * 1992-07-21 1997-12-19 Seiko Epson Corp Impact dot printing head and impact dot printer
JP2560681B2 (en) * 1992-09-18 1996-12-04 セイコープレシジョン株式会社 Wire dot printer with switchable printing modes
US5793392A (en) * 1995-06-13 1998-08-11 Tschida; Mark J. Printing apparatus and method

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2071162A5 (en) * 1969-12-19 1971-09-17 Radiotechnique Compelec
US3833105A (en) * 1970-05-15 1974-09-03 Centronics Data Computer Printer head assembly
US3625142A (en) * 1970-06-10 1971-12-07 Datascript Terminal Equipment High-speed printing apparatus having slidably mounted character-forming elements forming a dot matrix
GB1364646A (en) * 1971-10-07 1974-08-29 Creed Co Ltd Printed telegraph machine
DE2436970A1 (en) * 1974-07-31 1976-02-19 Siemens Ag DEVICE IN MOSAIC NEEDLE PRINT HEADS FOR GUIDING PRINTER NEEDLES
US4010835A (en) * 1975-08-01 1977-03-08 International Business Machines Corporation Matrix print head
DD128153A1 (en) * 1976-08-26 1977-11-02 Volker Flechtner MOSAIC HEAD
SE408034B (en) * 1977-03-15 1979-05-14 Philips Svenska Ab STORAGE DEVICE AT A MOSAIC PRINT HEAD
US4236836A (en) * 1979-03-30 1980-12-02 Teletype Corporation Dot impact printer and actuator therefor
DE3041877A1 (en) * 1980-11-06 1982-05-13 Mannesmann AG, 4000 Düsseldorf MATRIX PRINTER AND RELATED NEEDLE PRINT HEAD

Also Published As

Publication number Publication date
JPS5862071A (en) 1983-04-13
DE3271153D1 (en) 1986-06-19
US4470713A (en) 1984-09-11
EP0075342A3 (en) 1984-03-28
JPH0229022B2 (en) 1990-06-27
CH644307A5 (en) 1984-07-31
EP0075342A2 (en) 1983-03-30

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