EP0253189B1 - Dispositif de guidage pour les aiguilles dans une tête d'impression d'une imprimante à matrice de points et son procédé de fabrication - Google Patents

Dispositif de guidage pour les aiguilles dans une tête d'impression d'une imprimante à matrice de points et son procédé de fabrication Download PDF

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Publication number
EP0253189B1
EP0253189B1 EP87109315A EP87109315A EP0253189B1 EP 0253189 B1 EP0253189 B1 EP 0253189B1 EP 87109315 A EP87109315 A EP 87109315A EP 87109315 A EP87109315 A EP 87109315A EP 0253189 B1 EP0253189 B1 EP 0253189B1
Authority
EP
European Patent Office
Prior art keywords
needles
matrix
holes
plates
photo
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 - Lifetime
Application number
EP87109315A
Other languages
German (de)
English (en)
Other versions
EP0253189A1 (fr
Inventor
Mario Gaiardo
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.)
Microlys SpA
Original Assignee
Microlys SpA
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 Microlys SpA filed Critical Microlys SpA
Priority to AT87109315T priority Critical patent/ATE60004T1/de
Publication of EP0253189A1 publication Critical patent/EP0253189A1/fr
Application granted granted Critical
Publication of EP0253189B1 publication Critical patent/EP0253189B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
    • B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
    • B41J2/235—Print head assemblies
    • B41J2/265—Guides for print wires

Definitions

  • the present invention relates to a guide device for the needles of a print head of a dot matrix printer of the type comprising at least one matrix and one other element supported in a position parallel to one another by a support rigidly connected to the print head or to a part integral therewith, as well as to a process for the production of such device.
  • the invention moreover relates to the print head including such device.
  • matrix must be understood the guide element closest to the paper to be printed and positioned at the end of the support; by "focus” of a print head must be understood the plane perpendicular to the axis of symmetry of the head on which the ends of the needles converge in the same vertical line.
  • the object of the invention is that of providing a guide system for the needles of a dot matrix print head and a process for its production, which will have low cost and which will allow the use of sophisticated production technology to be avoided whilst guaranteeing a print quality equivalent to that of known heads.
  • the said objects are achieved by the invention in that it relates to a process for the production of a guide system for the needles of a dot matrix print head comprising a matrix and at least one other guide element for the said needles disposed parallel to the said matrix and mounted with it on a support rigidly connected to the said head, characterised by the fact that at least the said matrix is made by means of the following stages:
  • the invention moreoever relates to a guide device for the needles of a dot matrix print head comprising a matrix and at least one other guide element for the said needles disposed parallel to the said matrix and mounted with it on a support for the said head, characterised by the fact that at least the said matrix comprises a flat plate of reduced thickness with respect to its transverse dimensions and provided with a plurality of through holes for guiding the said needles, which holes have been formed by photo-etching of the said plate.
  • a dot matrix print head the structure and operation of which are known overall, comprising a plurality of needles 2, housed within a support 3 and slidably supported by a guide device or system comprising a matrix 4, a possible intermediate guide element 5 and a guide and shoulder element 6 of known type with which respective heads 8 of the needles 2 cooperate through respective biasing springs 7, which needles 2 are able to translate by suitable kinematic devices of known type and therefore not illustrated for simplicity, by a controlling magnetic field generated by appropriate electro-magnets also known and not illustrated for simplicity.
  • the needles 2 Upon overcoming the reaction of the springs 7 the needles 2 are thrust against an abutment surface 9 schematically indicated in broken outline.
  • the matrix 4 ( Figures 2 and 3) comprises, according to the invention, one or more thin flat plates 11 of a thickness appropriate for the process of photo-etching, superimposed over one another and fixed rigidly together, each of which is provided with an identical number of through holes 12 disposed in corresponding positions and able to define respective seats for guiding the needles 2.
  • the plate or plates 11 composing the matrix 4 are made of a chemically corrodable material in which the holes 12 are obtained not by mechanical working but by photo-etching; photo-etching is a well known method particularly applied to the production of printing blocks.
  • the matrix 4 is composed of three plates 11 of a thickness equal to about 0.1 mm, which are superimposed and fixed together by gluing or welding with corresponding holes disposed in corresponding positions.
  • the holes 12, which because of the production system adopted (photo-etching) can only be formed with their axes parallel to the axis of the head 1, are disposed offset from one another in a radial sense.
  • the corresponding holes 12 of the different plates 11 have axes passing through the points of intersection of the axes of the needles 2 of the head 1 with the respective ideal section planes parallel to the plates 11 and disposed at progressively greater distances from the focus of the print head. It is also possible to utilise different materials for the construction of the plate 11 as long as these are capable of being worked, according to the invention, by photo-etching for the purpose of obtaining the guide holes 12; in this case the expert in the art would chose the most appropriate technology to ensure the joining of several superimposed plates 11 in the case in which the matrix 4 is composed of more than one individual plate; this is appropriate in cases where it is desired to significantly increase the resistance to wear of the interior of the holes by the sliding of the needles. Experimental tests performed by the applicant have in fact shown that in print heads provided with matrices formed like the matrix 4 described the wear in the holes is a function of the thickness of the matrix 4 and lower values are achieved the greater is the number of plates comprising the matrix.
  • the print quality is equivalent to that of print heads equipped with matrices of known type.
  • each plate 11 be small with respect to the transverse dimensions thereof, and in particular, lie between 0.05 and 0.5 mm, otherwise the process for obtaining the holes 12 by photo-etching gives unsatisfactory results.
  • a single sheet of dimensions such as to contain a plurality of flat plates 11 is prepared by rolling a chemically corrodable material, preferably metal, to a thickness such as to be small with respect to the transverse dimensions of the plates 11.
  • a chemically corrodable material preferably metal
  • the holes are obtained according to the invention by photo-etching, operating in a known way which will therefore not be described in detail for simplicity.
  • the plates 11 intended to constitute the matrix 4 are cut from the sheet just worked; if the matrices 4 are composed of more than one plate 11 these are superimposed in a stack and glued together taking care to arrange the described offset between the corresponding holes of the different plates, and are mounted fixedly on the support 3 with a single operation; to this end, preferably, the plates 11 are provided, for example again by photo-etching, with respective reference holes 20 able to allow the mutual positioning of these and of the matrices 4 on the support 3 with adhesives or by clinching, welding or other appropriate connection system.

Landscapes

  • Character Spaces And Line Spaces In Printers (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Electronic Switches (AREA)
  • Impact Printers (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Claims (7)

1. Procédé de fabrication d'un système de guidage pour les aiguilles d'une tête d'impression à matrice de points comprenant une matrice (4) et au moins un autre élément de guidage (6) pour les aiguilles, lequel est disposé parallèlement à la matrice et est monté, avec cette matrice, sur un support fixé à la tête, caractérisé en ce qu'au moins la matrice est formée par les étapes suivantes:
préparation d'au moins une plaque plane (11) de faible épaisseur par rapport à ses dimensions transversales, en utilisant un matériau attaquable chimiquement; et
production dans la plaque (11), par photogravure, d'une pluralité de trous (12) étroitement espacés, et traversant la plaque de part en part;
montage de la plaque photogravée sur le support.
2. Procédé suivant la revendication 1 caractérisé en ce que pour chaque matrice (4) on prépare une pluralité de plaques (11) de faible épaisseur réalisées en un matériau attaquable chimiquement, ces plaques (11) étant photogravées de façon à former, sur chacune de ces plaques, un nombre égal de trou (12) en traversant, et on joint finalement les plaques (11) les unes aux autres, on les superpose avec leurs trous correspondants (12) disposés dans des positions correspondantes et on les monte, au cours d'une seule opération, sur le support (3).
3. Procédé suivant la revendication 2 caractérisé en ce que pendant l'étape de photogravure on forme les trous correspondants (12) de chaque plaque (11) dans des positions décalées radialement par rapport à celles des trous correspondants des autres plaques de la même matrice (4) de telle façon que, lorsque les plaques sont superposées, les trous correspondants (12) définissent des sièges respectifs inclinés (13) pour les aiguilles (2).
4. Dispositif de guidage des aiguilles d'une tête d'impression à matrice de points comprenant une matrice (4) et au moins un autre élément de guidage (6) pour les aiguilles (2), lequel est disposé parallèlement à la matrice (4) et est monté avec elle sur un support (3), caractérisé en ce qu'au moins la matrice (4) comprend au moins une plaque plane (11) de faible épaisseur par rapport à ses dimensions transversales et pourvue d'une pluralité de trous (12) traversant la plaque, pour le guidage des aiguilles (2), ces trous (12) ayant été formés par photogravure de la plaque (11).
5. Dispositif suivant la revendication 4 caractérisé en ce que la matrice (4) comporte une pluralité de plaques photogravées (11) collées fermement les unes aux autres en étant superposées, les trous de guidage (12) de ces plaques étant formés avec leurs axes parallèles à l'axe de la tête mais étant décalés les uns par rapport aux autres de manière à définir des sièges inclinés (13) pour les aiguilles (2).
6. Dispositif suivant la revendication 5 caractérisé en ce que les trous (12) des plaques photogravées superposées (11) ont leurs axes qui passent par les points d'intersection des axes des aiguilles (2) de la tête et des plans de coupe respectifs parallèles aux plaques (12) et disposés à des distances du foyer de la tête d'impression qui vont en croissant progressivement.
7. Tête d'impression à matrice de points caractérisée en ce qu'elle comporte un dispositif de guidage pour les aiguilles (2) suivant l'une quelconque des revendications 4 à 6.
EP87109315A 1986-07-18 1987-06-29 Dispositif de guidage pour les aiguilles dans une tête d'impression d'une imprimante à matrice de points et son procédé de fabrication Expired - Lifetime EP0253189B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87109315T ATE60004T1 (de) 1986-07-18 1987-06-29 Fuehrungsvorrichtung fuer die nadeln in einem druckkopf eines punktmatrixdruckers und verfahren fuer ihre herstellung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT6757986 1986-07-18
IT67579/86A IT1193158B (it) 1986-07-18 1986-07-18 Dispositivo di guida per gli aghi di una testa di stampa a matrice di punti e procedimento per la sua realizzazione

Publications (2)

Publication Number Publication Date
EP0253189A1 EP0253189A1 (fr) 1988-01-20
EP0253189B1 true EP0253189B1 (fr) 1991-01-16

Family

ID=11303600

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87109315A Expired - Lifetime EP0253189B1 (fr) 1986-07-18 1987-06-29 Dispositif de guidage pour les aiguilles dans une tête d'impression d'une imprimante à matrice de points et son procédé de fabrication

Country Status (5)

Country Link
EP (1) EP0253189B1 (fr)
AT (1) ATE60004T1 (fr)
DE (1) DE3767393D1 (fr)
ES (1) ES2019905B3 (fr)
IT (1) IT1193158B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2948419B2 (ja) * 1992-07-27 1999-09-13 富士通株式会社 ワイヤドット印字ヘッド

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3802543A (en) * 1971-09-13 1974-04-09 Centronics Data Computer Jewel bearings for printer heads and the like
DE2512333A1 (de) * 1975-03-20 1976-10-07 Siemens Ag Mosaikschreibwerk unter verwendung von druckernadeln
GB2129740B (en) * 1982-11-12 1985-09-04 Epson Corp Wire drive unit for use in a wire dot print head

Also Published As

Publication number Publication date
IT1193158B (it) 1988-06-02
ATE60004T1 (de) 1991-02-15
IT8667579A0 (it) 1986-07-18
ES2019905B3 (es) 1991-07-16
DE3767393D1 (de) 1991-02-21
EP0253189A1 (fr) 1988-01-20

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