EP0131300B1 - Imprimante de lignes à matrice de points - Google Patents

Imprimante de lignes à matrice de points Download PDF

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Publication number
EP0131300B1
EP0131300B1 EP84108008A EP84108008A EP0131300B1 EP 0131300 B1 EP0131300 B1 EP 0131300B1 EP 84108008 A EP84108008 A EP 84108008A EP 84108008 A EP84108008 A EP 84108008A EP 0131300 B1 EP0131300 B1 EP 0131300B1
Authority
EP
European Patent Office
Prior art keywords
arm
dot matrix
arms
printing hammer
line printer
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
EP84108008A
Other languages
German (de)
English (en)
Other versions
EP0131300A1 (fr
Inventor
C. Gordon Whitaker
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.)
Mannesmann Tally Corp
Original Assignee
Mannesmann Tally Corp
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 Mannesmann Tally Corp filed Critical Mannesmann Tally Corp
Publication of EP0131300A1 publication Critical patent/EP0131300A1/fr
Application granted granted Critical
Publication of EP0131300B1 publication Critical patent/EP0131300B1/fr
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
    • B41J9/00—Hammer-impression mechanisms
    • B41J9/02—Hammers; Arrangements thereof
    • B41J9/127—Mounting of hammers
    • 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
    • B41J9/00—Hammer-impression mechanisms
    • B41J9/02—Hammers; Arrangements thereof
    • B41J9/133—Construction of hammer body or tip

Definitions

  • the invention relates to a dot matrix line printer for writing characters or drawings formed from dot patterns on a recording medium which can be moved perpendicularly to the line direction by means of a pendulum device which can be reciprocated horizontally on a printing line and which has an elongated carriage, slide or the like
  • Resilient printing hammer arms are arranged in a row in a row of printing hammer, of which several form a unit by means of the base and several of which together form a printing hammer module, each printing hammer module having a plurality of magnetic flux circuits, each consisting of a cross-polarized permanent magnet, a coil stand with an electromagnetic coil, a field line return plate and a one-armed print hammer arm which has a base, a middle thinner spring area and a thicker head area.
  • Such a dot matrix line printer is known from US Pat. No. 4,351,235 or European Patent Application 0 047 883.
  • dot matrix printers can be separated into two types of printers. Line printers and serial printers. Both types of printers form images (characters or constructions) by selectively printing a series of dots in an X-Y matrix.
  • a dot matrix serial printer has a head that moves back and forth horizontally continuously or step by step on a sheet of paper. The head contains a vertical column of dot pressure elements. When the column position of a character position is reached during printing, the corresponding number of dot printing elements is actuated to form dots. A row of the vertical columns of dots formed in this way forms the desired symbol.
  • dot matrix line printers have dot printing devices for forming horizontal dot lines while the paper is being fed through the printer step by step. A series of horizontal lines of dots forms an image, that is, a series of characters or a construction.
  • the present invention relates to dot matrix line printers and not to dot matrix serial printers.
  • Each print hammer arm of the dot printing device described in U.S. Patent 4,351,235 includes a permanent magnet, a coil stator and field line return plates which form a ferromagnetic path between the permanent magnet and the coil stator.
  • the coil stand carries an electromagnetic coil and is arranged on the stiffening side of the pressure hammer opposite the anvil. If no current flows through the electromagnetic coil, the print hammer is attracted to the coil stand by the magnetic field generated by the permanent magnet and is therefore tensioned.
  • the tensioned pressure hammers are released by excitation of the solenoid coils to form dots, the solenoid coils generating a magnetic field which counteracts the magnetic stator pulling field generated by the permanent magnet.
  • dot printing devices for dot matrix line printers of the type described in US Pat. No. 4,351,235 have a number of advantages over previous printing devices for such printers and thus represent a significant advance in technology, these dot printing devices can still be improved.
  • the dot printing device described in U.S. Patent 4,351,235 has a two-part printing hammer.
  • a two-part pressure hammer arm is expensive to manufacture and therefore undesirable. The two parts must be shaped and welded accordingly.
  • Another disadvantage of these point printing devices is that the pressure hammer arm only hits the tip of the bobbin stand. Since the pole tip is small, the coil stator wear is high and the service life of the point printing devices is shorter than desired.
  • the present invention aims to overcome the disadvantages mentioned.
  • the invention is therefore based on the object to improve a print hammer arm of the known type in the sense of a more economical production and to improve it functionally in such a way that the life of the entire dot printing device is increased.
  • the object is achieved according to the invention in the dot matrix line printer and the resilient print hammer arm described at the outset in such a way that the base has a thicker area, that the thinner spring area and the thicker head area are made in one piece from a piece of sheet metal made of a magnetically conductive material and that the fiber direction each in the direction of the longitudinal extension of the one-armed print hammer arms.
  • the magnetic flux plate for the magnetic flux circuits is made in one piece of several single-arm print hammer arms.
  • the single-armed print hammer arms in the area of the reel stand be designed curved in the direction of the recording medium and be provided with a pressure tip.
  • the invention is further improved in that the wear-resistant balls are welded to the one-armed print hammer arms.
  • the contour of the one-armed print hammer arms is approximately isosceles trapezoidal.
  • Another improvement is that in the area of the pressure peaks, the area which is just straight before bending and which forms the outer arc after bending is provided with a recess.
  • a further embodiment of the invention consists in that the contour of the single-armed print hammer arms and / or the field line return plate and / or the magnetic flux plate is produced in the etching process.
  • the thickness of the base and the thickness of the thicker head portion of the single arm print hammer arms are approximately the same size.
  • Another advantage is that in the area of the pressure tip, paired ear-shaped lateral projections are provided on the one-armed print hammer arms.
  • the thicker head area of the one-armed print hammer arms be provided with an electrolytically applied coating on the support side.
  • the present invention relates to a hammer mod for a dot matrix line printer.
  • the hammer module has a projecting multi-arm pressure hammer.
  • the multi-armed pressure hammer includes a plurality of pressure hammer arms each with a thin spring area and a thick head area formed from a piece of resilient ferromagnetic material.
  • each hammer module has magnetic circuits for each print hammer arm, consisting of a common permanent magnet, a coil stand, an arm of a magnetic flux plate and an arm of a field line return plate.
  • the coil stand is mounted on the tip of the field line return plate.
  • the magnetic flux plate and the field line return plate lie in parallel planes on opposite sides (poles) of the permanent magnet.
  • the coil stands, the field line return plate and the magnetic base plate are dimensioned and positioned such that the tip of the coil stands (coplanar) lie in the same plane as the outer surface of the field line return plate.
  • a gap is provided between the tips of the coil stands and the associated field line return plates.
  • the head area of the one-piece print hammer arm is positioned so that it is attracted both by the tip of the associated coil stand and by the end of the field line return plate and strikes accordingly.
  • the attraction force is applied by the magnetic flux generated by the permanent magnet when the electromagnetic coils wound around the coil stand are not excited.
  • the tightening force acts on the thin spring area of the print hammer arms and leads to tensioning of the print hammer arms.
  • an electromagnet coil When an electromagnet coil is excited, it generates a magnetic field which counteracts the magnetic flux generated by the permanent magnet.
  • the opposing magnetic flux releases the associated tensioned print hammer arm and generates a force with which a ball welded to the opposite side of the print hammer arm shoots against the ink ribbon of a pressure recording device.
  • the ball impact pushes the ribbon against a print media (e.g., a sheet of paper) and forms a dot.
  • a one-piece print hammer module 11 designed according to the invention includes: a permanent magnet 13; a magnetic flux plate 15; a field line return plate 17; a plurality of cylindrical coil stands 19; a plurality of electromagnetic coils 21; and a multi-arm print hammer row 23.
  • the multi-arm print hammer module 11 shown in FIG. 1 has three print hammer arms 25 which extend outwards from a first base 27 on a common plane.
  • the magnetic flux plate 15 shown has three arms 29 which extend outwards in a common plane from a second base 31;
  • the field line return plate 17 shown has three arms 33 which extend outwards in a common plane from a third base 35.
  • the number of coil stands 19 and electromagnetic coils 21 shown is three. Even if the one-piece print hammer module 11 is based on three, this embodiment, although preferred, means no limitation. The triple form is preferred because from the standpoint of manufacturability it results in a printing hammer module of a convenient size. In addition, three can be divided into 66 parts, and this is the preferred number of dot printing elements, for printing a standard line with 132 characters.
  • the permanent magnet 13 is an elongated, rectangular, parallel-flat permanent magnet.
  • the polarization of the permanent magnet is selected so that one pole (for example the north pole "N") of the magnet lies on one long side and the other pole (for example the south pole "S") on the opposite long side.
  • the third base 35 of the field line return plate 17 is mounted on one of the polarized surfaces of the elongated permanent magnet 13; the second base 31 of the magnetic flux plate 15 is mounted on the other polarized surface.
  • the magnetic flux plate 15 and the field line return plate 17 lie in parallel planes.
  • the arms 29 and 33 are formed and positioned so that they are aligned with each other.
  • the second base 31 of the magnetic flux plate 15 has two threaded holes 37 between the arms 29.
  • One of the coil stands 19 is attached to the outside of each arm 29 of the magnetic flux plate 15.
  • the coil stands 19 extend orthogonally outward from the plane of the magnetic flux plate 15 to the field line return plate 17.
  • the coil stands 19 are preferably fastened to the arms 29 by radial riveting of the stands into the holes in the arms 29.
  • An electromagnetic coil 21 is mounted on each of the coil stands 19.
  • the third base 35 of the field line return plate 17 has two countersunk bores 39 between the arms 33 so that it can be aligned with a pair of slots 41 provided in the permanent magnet 13.
  • the slots 41 can in turn be aligned with the threaded holes 31 in the second base 31 of the magnetic flux plate 15.
  • a pair of non-magnetic pan head screws 42 are inserted into the countersunk holes 39 and the slots 41 and screwed into threaded holes 37. After tightening the pan head screws 42, the permanent magnet 13 is clamped between the second base 31 of the magnetic flux plate 15 and the third base 35 of the field line return plate 17.
  • the coil stands 19 are of such a length that the outer surface of the tips of the coil stands 19 lie in one plane (coplanar) with the outer surface of the arms 33 of the field line return plate 17.
  • the tips of the arms 33 of the field line return plate 17, which are adjacent to the coil stands 19, are curved so that between the curved periphery of the arms 33 and the adjacent periphery of the coil stand 19 a Gap of constant distance results.
  • the first base 27 of the multi-arm print hammer arm 23 has three holes 43, each of which is aligned with one of the print hammer arms 25.
  • the multi-arm print hammer arm 25 is positioned such that its first base 27 lies over the third base 35 of the field line return plate 17. In this position, the holes 43 in the first base 27 of the row of printing hammer 23 are aligned with the three threaded holes 45 in the third base 35 of the field line return plate 17.
  • the screws 47 extend through the holes 43 in the first base 27 of the multi-arm printing hammer arm 25 into the threaded holes 45 in the third base 35 of the field line return plate 17.
  • the first base 27 of the print hammer arm 25 is fastened to the third base of the field line return plate 17.
  • the multi-arm print hammer arm 25 is made from a piece of ferromagnetic material based on the invention. That is, the first base 27 and the print hammer arms 25 are integrally formed from a planar piece of ferromagnetic material. In addition, all of the arm areas described below are fully integrated.
  • the multi-arm print hammer arm 25 is manufactured from a sheet of a suitable ferromagnetic material such as alloy steel 4130 (US standard) by means of conventional chemical milling processes. Undesired areas of material are chemically etched away in a conventional manner to obtain print hammer arms 25 having the shape described below. After completion, the tips of the print hammer arms 25 are bent and pressure balls 49, as described in more detail below, are welded to the bent tips.
  • the print hammer arm 25 is relatively thick. As described above, the print hammer arms 25 lie in a common plane. Before bending the print hammer arms 25 in the manner described below, the hammer arm plane (coplanar) lies in a plane with the plane of the first base 27. Thus, the print hammer arms 25 all extend outward from the base in the same direction, similar to the teeth of one Comb. Starting from the first base 27 when viewed in cross section, the print hammer arms 25 all have a thin spring region 51, followed by a thick head region 53. The thickness of the head region 53 corresponds approximately to that Thickness of the first base 27.
  • the thin spring areas 51 When viewed in the common plane of the first base 27 and the print hammer arms 25, the thin spring areas 51 have the shape of an isosceles trapezoid, the longer parallel sides of the trapezoid being integrated with the base 27 of the print hammer arm 25.
  • the isosceles trapezoidal shape of the thin spring portions 51 has been chosen for illustration only.
  • the thin spring portions 51 can also have other shapes, if desired. You can e.g. B. be rectangular.
  • the thick head regions 53 of the print hammer arms 25 are integrated with the shorter parallel sides of the trapezoidal thin spring regions 51.
  • the preferred fiber direction of the print hammer arms 25 is represented by arrows 54.
  • the edges of the thick head area 53 initially extend outward in parallel lines.
  • a pair of ears 55 protrude outward from the parallel edges.
  • the edges of the thick head region 53 curve towards one another and end in a narrow tip 57.
  • a surface of the tip 57 in the region 59 between the end of the conical region and the end of the Lace material removed. Material is only removed from one surface of the tip. The other side of the surface remains flat. As described below, this reduction in material serves to achieve a sharp bend radius.
  • the tip 57 is bent 90 ° and the end of the bent tip is flattened. As shown in Fig. 6, the tip 57 is bent so that the area 59 which lies between the end of the conical area and the end of the tip where the material has been removed forms the outside of the curvature.
  • the pressure ball 49 (FIG. 1) is attached to the flattened surface.
  • the pressure balls 49 are preferably made of tungsten carbide and welded to the ends of the tips 57 of the pressure hammer arms 25 by means of resistance welding.
  • the ears 55 form easily detectable points of attack for bending the print hammer arms 25 away from the plane of the first base 27 so that the gap described below between the print hammer arms 25 and the reel stand tips and the ends of the field line return plates 17 is not in a magnetic field.
  • the print hammer arms 25 are bent such that the hammer arm plane is no longer (coplanar) in a plane with the first base 27.
  • the bending angle is of course extremely small.
  • the surface of the head region 53 which lies between the thin spring region 51 and a region 59 where the material has been removed from the tip 57, can preferably be provided with a wear-resistant coating in accordance with the invention. As shown in FIG. 2, this surface meets the coil stand tips and the adjacent outer surface of the arms 33 of the field line return plate 17. This area is preferably coated with a layer of dense chrome. Although a coating applied by electrolysis is preferred, other coatings, such as an electroless nickel coating improved with particles, can be used if desired.
  • the permanent magnet 13 After assembly in the manner shown and already described in FIGS. 1 and 2, the permanent magnet 13 generates a magnetic field (represented by arrows in FIG. 2) which firmly fixes the head regions 53 against the associated coil stand tips and ends of the arms 33 of the field line return plate 17 pulls. These ends form poles at the same time. If there is no magnetic field generated by the permanent magnet 13, the head regions 53 are separated from the coil stand tips and ends of the field line return plate 17 by a very small space, preferably in the range from 16 to 20 thousandths of an inch. If the permanent magnet 13 pulls the head regions 53 over the gap against the coil stand tips and ends of the field line return plate 17, then the thin spring regions 51 of the print hammer arms 25 are under tension. If the thin spring areas 51 are under tension in this form, the print hammer arms 25 are tensioned.
  • the electromagnetic coils 21, which are mounted on the coil stands 19, are excited so that they counteract the magnetic field generated by the permanent magnet 13.
  • the corresponding print hammer arm 25 is released when current flows through one or more solenoid coils 21.
  • the energy stored in the tensioned thin spring area 51 is used to move the end of the print hammer arm 25 and thus the pressure ball 49 away from the spool stand tip.
  • the pressure ball 49 thereby strikes a ribbon against a suitable pressure recording medium (such as paper), which is supported with the aid of a roller (not shown).
  • a dot is therefore printed on the print recording medium.
  • the current through the electromagnetic coil 21 ceases to flow when the print hammer arm 25 recoils from the stroke and the recoil pressure hammer arm 25 is tensioned because the head region 53 against the tip of the coil stator 19 and by the magnetic field generated by the permanent magnet 13 the adjacent end of the field line return plate is withdrawn.
  • the present invention switches the disadvantages of prior print hammer devices, such as the type of print hammer device described in U.S. Patent 4,351,235. More specifically, the creation of a one-piece print hammer of the type described herein means that no stiffening has to be welded to a spring element, which leads to lower costs in the production of the print hammer series 23. In addition, the stator wear is reduced because the print hammer arm 25 strikes both on the field line return plate 17 and on the stand tip, which in turn leads to a considerably longer service life of the print hammer device. Finally, the introduction of a thick base instead of a separate clamping element, as described for the print hammer assembly in U.S. Patent 4,351,235, further reduces the print hammer row cost.

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  • Impact Printers (AREA)

Claims (11)

1. Imprimante ligne par ligne à matrice, pour l'écriture de caractères, respectivement de dessins, formés de modèles en points, sur un support d'information mobile perpendiculairement par rapport à la direction des lignes, au moyen d'un dispositif perpendiculaire mobile horizontalement sur une ligne d'impression, en avant et en arrière et qui possède un chariot longitudinal, ou similaire, sur lequel des bras de marteaux d'impression (25) élastiques sont disposés chacun les uns à côté des autres, en direction des lignes et en formant une rangée de marteaux d'impression (23). Plusieurs de ces bras de marteaux d'impression forment une unité, au moyen de la base et parmi lesquels plusieurs forment entre eux un module de marteaux d'impression (11) possédant à cette occasion plusieurs circuits de flux magnétique, qui se composent chacun d'un aimant permanent (13) polarisé transversalement, d'un montant de bobine (19) avec une bobine électromagnétique (21), d'une plaque de retour de lignes de champ (17) et d'un bras de marteau d'impression (25) à un seul bras, qui possède une base (27), une zone de flexion (51) médiane mince et une zone de tête (53) épaisse, caractérisée en ce que la base (27) possède une zone épaisse, que la zone de flexion (51) mince et la zone de tête (53) épaisse sont fabriquées en une partie, à partir d'une pièce de tôle d'un matériau magnétique- ment conducteur et que la direction des fibres (54) se développe chaque fois en direction de l'étendue longitudinal des bras de marteau d'impression (25) à un bras.
2. Imprimante ligne par ligne à matrice selon la revendication 1, caractérisée en ce que la plaque de flux magnétique (15) est réalisée en une partie, pour les circuits de flux magnétique à plusieurs bras de marteau d'impression (25) à un bras.
3. Imprimante ligne par ligne à matrice selon les revendications 1 et 2, caractérisée en ce que dans la zone du montant de bobine (19), les bras de marteau d'impression (25) à un bras sont réalisés de manière flexible en direction du support d'information, et sont pourvus d'une pointe d'impression (57).
4. Imprimante ligne par ligne à matrice selon les revendications 1 à 3, caractérisée en ce que les pointes d'impression (57) se composent de billes (49) dures, résistantes à l'usure.
5. Imprimante ligne. par ligne à matrice selon les revendications 1 à 4, caractérisée en ce que les billes (49) résistantes à l'usure sont chacune soudées sur les bras de marteau d'impression (25).
6. Imprimante ligne par ligne à matrice selon les revendications 1 à 5, caractérisée en ce que le contour des bras de marteau d'impression (25) est approximativement isocèle et en forme de trapèze.
7. Imprimante ligne par ligne à matrice selon les revendications 1 à 6, caractérisée en ce que dans la zone des pointes d'impression (57), la zone qui est encore droite avant pliage et qui forme le coude extérieur après pliage est pourvue d'une cavité (59).
8. Imprimante ligne par ligne à matrice selon une ou plusieurs des revendications 1 à 7, caractérisée en ce que le contour des bras de marteau d'impression (25) à un bras et/ou de la plaque de retour de ligne de champ (17) et/ou de la plaque de flux magnétique (15) est fabriqué selon un procédé d'attaque chimique.
9. Imprimante ligne par ligne à matrice selon les revendications 1 à 8, caractérisée en ce que l'épaisseur de la base (27) et l'épaisseur de la zone de tête (53) plus épaisse des bras de marteau d'impression (25) à un bras sont approximativement d'égale importance.
10. Imprimante ligne par ligne à matrice selon les revendications 1 à 9, caractérisée en ce que des saillies latérales (5) en forme d'oreilles sont prévues par paires, dans la zone des pointes d'impression (57), sur les bras de marteau d'impression (25) à un bras.
11. Imprimante ligne par ligne à matrice selon les revendications 1 à 10, caractérisée en ce que la zone de tête (53) épaisse des bras d'impression (25) à un bras est pourvue d'un revêtement appliqué électrolytiquement, sur le côté de l'appui.
EP84108008A 1983-07-11 1984-07-09 Imprimante de lignes à matrice de points Expired EP0131300B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/512,470 US4503768A (en) 1983-07-11 1983-07-11 Single piece hammer module
US512470 1983-07-11

Publications (2)

Publication Number Publication Date
EP0131300A1 EP0131300A1 (fr) 1985-01-16
EP0131300B1 true EP0131300B1 (fr) 1988-09-07

Family

ID=24039235

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84108008A Expired EP0131300B1 (fr) 1983-07-11 1984-07-09 Imprimante de lignes à matrice de points

Country Status (5)

Country Link
US (1) US4503768A (fr)
EP (1) EP0131300B1 (fr)
JP (1) JPS6038168A (fr)
CA (1) CA1219169A (fr)
DE (1) DE3473857D1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4584937A (en) * 1983-12-07 1986-04-29 Mannesmann Tally Corporation Long release coil hammer actuating mechanism
JPS60174659A (ja) * 1984-02-22 1985-09-07 Hitachi Ltd 印字機構
US4771689A (en) * 1985-09-25 1988-09-20 Dataproducts Corporation Unitary spring armature for a dot matrix printer
US5237918A (en) * 1987-05-09 1993-08-24 Hitachi Koki Co., Ltd. Printing head in a dot-line printer
CA1324028C (fr) * 1987-07-01 1993-11-09 Norman Edwin Farb Imprimante a rangee de marteaux amelioree
US4790674A (en) * 1987-07-01 1988-12-13 Printronix, Inc. Impact printer having wear-resistant platings on hammer springs and pole piece tips
US4833980A (en) * 1987-08-31 1989-05-30 Mannesmann Tally Corporation High efficiency coil posts for print hammer actuators
US5361693A (en) * 1992-12-08 1994-11-08 Printronix, Inc. Tungsten carbide welded printer tips
US6437280B1 (en) * 1999-12-03 2002-08-20 Printronix, Inc. Printer hammer tip and method for making

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE417141B (sv) * 1977-11-09 1981-02-23 Facit Ab Anordning for astadkommande av markeringar pa ett upptecknigsmedium
US4233894A (en) * 1978-06-02 1980-11-18 Printronix, Inc. Print hammer mechanism having dual pole pieces
JPS5845952B2 (ja) * 1979-04-27 1983-10-13 株式会社パイロット ドツトプリンタのプリントハンマ−
US4269117A (en) * 1979-07-11 1981-05-26 International Business Machines Corporation Electro-magnetic print hammer
US4351235A (en) * 1980-09-11 1982-09-28 Mannesmann Tally Corporation Dot printing mechanism for dot matrix line printers
JPS5784882A (en) * 1980-11-17 1982-05-27 Ibm Hammer mechanism
JPS57152960A (en) * 1981-03-18 1982-09-21 Nec Corp Driving mechanism for printer head

Also Published As

Publication number Publication date
DE3473857D1 (en) 1988-10-13
US4503768A (en) 1985-03-12
JPS6038168A (ja) 1985-02-27
EP0131300A1 (fr) 1985-01-16
CA1219169A (fr) 1987-03-17

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