EP0112275B1 - Tête d'impression à aiguilles pour imprimante à matrice de points - Google Patents

Tête d'impression à aiguilles pour imprimante à matrice de points Download PDF

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Publication number
EP0112275B1
EP0112275B1 EP83730097A EP83730097A EP0112275B1 EP 0112275 B1 EP0112275 B1 EP 0112275B1 EP 83730097 A EP83730097 A EP 83730097A EP 83730097 A EP83730097 A EP 83730097A EP 0112275 B1 EP0112275 B1 EP 0112275B1
Authority
EP
European Patent Office
Prior art keywords
magnet
needle
print head
head according
shaped
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
EP83730097A
Other languages
German (de)
English (en)
Other versions
EP0112275A1 (fr
Inventor
Bernd Dipl.-Ing. Gugel
Harald Dipl.-Ing. Niebel
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
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 AG filed Critical Mannesmann AG
Publication of EP0112275A1 publication Critical patent/EP0112275A1/fr
Application granted granted Critical
Publication of EP0112275B1 publication Critical patent/EP0112275B1/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
    • 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
    • B41J2/27—Actuators for print wires
    • B41J2/28—Actuators for print wires of spring charge type, i.e. with mechanical power under electro-magnetic control

Definitions

  • the invention relates to a dot matrix printhead for matrix printers with a bobbin which has spaced apart magnetic yokes, each of which is associated with an electromagnetic coil surrounding a magnetic yoke and a magnet armature attached to a resilient element, which is connected to the rear end of a printing needle, with its front end Pressure points can be generated on a record carrier by selective energization of the electromagnetic coils, and with a disc-shaped permanent magnet provided in the core region of the coil carrier.
  • Such dot matrix print heads achieve printing speeds which are the same as those of slow line printers (600 characters per second) and are known to be considerably less complex than such line printers.
  • needle print heads are inferior to line printers in terms of the service life, which is measured in millions of characters. Efforts are therefore being made to improve the relatively inexpensive dot matrix print heads for matrix printers in order to obtain a longer service life.
  • the dot matrix printhead for matrix printers represents an object that has to be accelerated from zero speed to a constant speed and then decelerated again.
  • the known object is also designed with respect to the magnetic circuit in such a way that the pole faces of two pole pieces lie in mutually perpendicular planes and are arranged closely adjacent to one another, that the armature is provided with corresponding surfaces parallel to the pole faces, and that a pair of crossed bending members is provided to form a pivot bearing for the armature and the pivot axis lies approximately in the plane of the pole face of the electromagnet, the armature being forced to move along a path which intersects the plane of the pole face of the electromagnet, as a result of which the permanent magnet contacts the armature in contact the pole face of the electromagnet and at a short distance from the permanent magnet pole piece.
  • Such a magnet system may have certain advantages, but it intentionally contains several air gaps in the electromagnet.
  • the training of the individual links is still very expensive, such as. B. training with crossed bending members to form a pivot bearing for the anchor.
  • the invention has for its object to propose an even lighter needle print head for higher speeds combined with simpler manufacturing technology and high electrical efficiency.
  • the coil carrier forms magnetic yokes in the number of printing lines even on the outer circumference or edge, that the magnetic yokes and the electromagnetic coils used form a flat surface with their respective outer sides with the disc-shaped permanent magnets arranged in an interior of the coil carrier that a disc-shaped, magnetizable cover, which is placed on the common flat surface and covers the electromagnetic coils, is provided, and that the magnet armature is opposite each for a printing needle on the cover of the electromagnetic coil.
  • the better utilization of the magnetic fluxes is achieved in particular in that interruptions of the magnetic flux in the form of gaps filled with non-magnetizable material are provided in the disc-shaped, magnetizable cover with respect to the magnet armature.
  • the gaps therefore limit leakage flux losses.
  • Another measure to steer the magnetic fluxes into desired paths is that the magnetic armatures are arranged on the disk-shaped cover, covering at least the intermediate spaces.
  • the non-magnetizable material in the interstices advantageously consists of solder or cast resin.
  • the resilient element connected to the magnet armature is under bending prestress.
  • Such an arrangement serves for easy adjustability during assembly, in which the basis for the proper functioning of the individual parts is created.
  • the bending pretension is also a means of achieving a uniform firing of the individual needles.
  • the coil carrier consist of a thin-walled base body produced by shape stamping and section-wise bending, in which the yoke legs are each below the bottom surface bent and bent up to a "U" with unevenly long yoke legs, the outer of which protrude above the floor surface.
  • Such a bobbin can also be used for a non-circular arrangement of the printing needles or printing hammers. It is then provided for this that the coil carrier, the permanent magnet or the disk-shaped cover are each rectangular or round.
  • a simplification compared to the prior art is achieved in that the side walls of the magnet armature are made of a material of sheet thickness, which is shaped into a rigid cross-section with a triangular plan.
  • the needle printhead according to the invention is formed from merging functions of easier assembly, the stray fluxes to be avoided or their utilization and to save weight to the extent that the coil carrier, the permanent magnet and the disk-shaped cover are connected to one another in areas of flat surfaces touching one another. This results in a particularly compact design with the functional advantages mentioned.
  • the needle print head has a coil carrier 1 which is further shaped on the outer circumference 2 to form magnetic yokes 3, such an approximately shell-shaped coil carrier 1 being able to be produced from soft iron sheet by pulling or pressing and punching and forming an interior 1 a.
  • the magnetic yokes 3 protrude upward as approximately rectangular yoke legs 3a (FIG. 2) and are each surrounded by the associated electromagnetic coil 4.
  • the permanent magnet 5 is located in the interior 1a.
  • the end faces 3b and the end face 5a lie on a surface 6 of the same height, which can be created by adjusting the thickness of the permanent magnet 5.
  • the screw 9 is magnetically separated from the permanent magnet 5 and from the coil carrier 1 via the insulating sleeve 10.
  • the magnetic flux 11 is created around each electromagnetic coil 4, the magnet armature 12 being pulled into the position shown in FIG. 1.
  • the pressure needle 13 is attached to the magnet armature 12. All Drucknadein 13 are guided in a mouthpiece 14 of the front housing part 8b.
  • the magnet armature 12 is itself fastened to the resilient element 15.
  • the resilient element 15 is in the drawn position so biased that when the solenoid 4 is energized, the magnetic field of the permanent magnet 5 is abruptly canceled, so that the mechanical force of the resilient element 15, the mass of the magnet armature 12 with that of the pressure needle 13 against the ( shoots not shown) shoots in direction 16, which rests on a platen (the platen usually consists of a pressure roller).
  • each magnet armature 12 is constructed from light side walls 12a and 12b and connected to the magnet plate 17.
  • the resilient element 15 is connected to the magnetic plate 17 by means of the screws 18a and 18b.
  • the resilient element 15 is lever-shaped at its free end by means of the fastening screw 19 and the adapter 20 on the cover 7.
  • the cover 7 is not in one piece, but consists of the inner plate 7a and the outer ring 7b, which form an intermediate space 21 between them.
  • This space 21 is made of non-magnetizable material, such as. B. fusible link, casting resin, adhesive, ceramic or the like.
  • the gaps 21 allow the magnetic flux to flow in precisely definable trajectories without disadvantageous stray fluxes.
  • the coil carrier 1 is produced by stamping and then bending from flat sheet metal blanks.
  • the coil carrier 1 therefore represents an economically producible, lightweight base body 1.
  • the yoke legs 3a are bent down to below the base surface 1b and bent up to form a “U” with legs of unequal length, the outer ones of which project beyond the base surface 1b.
  • the invention is not limited to a circular arrangement of the printing needles 13.
  • the arrangement of the printing needles can also be long. parallel rows take place so that the yoke legs then also form parallel rows.
  • the side walls 12a, 12b, the pressure needle 13 and the resilient element 15 are each connected to a unit by means of screwing, welding or soldering.
  • the side walls 12a, 12b are also made of a material of sheet thickness, a rigid cross section 22 having a triangular outline 23 being formed.

Landscapes

  • Impact Printers (AREA)

Claims (10)

1. Tête d'impression à aiguilles pour imprimante matricielle, avec un support de bobine (1), qui présente des culasses d'électro-aimant (3) réparties à une certaine distance les unes des autres, à chacune desquelles est affectée une bobine d'électro-aimant entourant une culasse et une armature d'électro-aimant fixée à un élément élastique (15), laquelle, en son extrémité arrière, est reliée à une aiguille d'impression (13), par l'intermédiaire de l'extrémité avant de laquelle des points d'impression peuvent être produits sur un support d'enregistrement, par excitation sélective des bobines d'électro-aimant, et avec un aimant permanent (5) en forme de disque prévu dans la zone du noyau du support de bobine, caractérisée en ce que le support de bobine (1) forme lui-même, sur la périphérie extérieure (2) ou sur le bord, des culasses (3) dont le nombre est égal à celui des aiguilles d'impression (13), que les culasses (3) et les bobines d'électroaimant utilisées (4) forment, avec les aimants permanents (5) en forme de disque, disposés dans un espace intérieur (1a) du support de bobine (1), et par leurs côtés extérieurs, une surface plane (6), qu'il est prévu une couverture magnétisable (7), placée sur la surface plane commune (6), en forme de disque, recouvrant les bobines d'électro-aimant (4), et que l'armature (12) est, pour chaque aiguille d'impression (13), placée sur la couverture (7) d'une manière opposée à la bobine d'électro-aimant (4).
2. Tête d'impression à aiguilles selon la revendication 1, caractérisée en ce qu'il est prévu dans la couverture magnétisable (7) en forme de disque, d'une manière opposée à l'armature (12), des interruptions du flux magnétique se présentant sous la forme d'intervalles (21) remplis d'un matériau non-magnétisable.
3. Tête d'impression à aiguilles selon l'une des revendications 1 et 2, caractérisée en ce que les armatures (12) et au moins les intervalles (21), sont chacun disposés de façon à recouvrir la couverture (7) en forme de disque.
4. Tête d'impression à aiguilles selon l'une des revendications 1 à 3, caractérisée en ce que le matériau non-magnétisable dans les intervalles (21) est constitué de métal d'apport ou de résine de coulée.
5. Tête d'impression à aiguilles selon l'une des revendications 1 à 4, caractérisée en ce que l'élément-élastique (15) lié à l'armature (12) est en précontrainte de flexion.
6. Tête d'impression à aiguilles selon l'une des revendications 1 à 5, caractérisée en ce que le support de bobine (1) est constitué d'un corps de base (1a), à mince épaisseur de paroi, réalisé par nervurage et pliage par portions, dans lequel les branches de culasse (3a) sont chacune repliées vers le bas en dessous de la surface inférieure (1 b) et repliées vers le haut pour former un « U ", ayant des branches de longueurs différentes, et dont les branches extérieures dépassent de la surface inférieure (1b).
7. Tête d'impression à aiguilles selon l'une des revendications 1 à 6, caractérisée en ce que le support de bobine (1), l'aimant permanent (5) et la couverture en forme de disque (7) sont chacun circulaires ou rectangulaires.
8. Tête d'impression à aiguilles selon une ou plusieurs des revendications 1 à 7, caractérisée en ce que l'élément élastique (15), les parois latérales (12a, 12b) de l'armature (12) et une aiguille d'impression (13) forment une unité intégrée.
9. Tête d'impression à aiguilles selon les revendications 1 à 8, caractérisée en ce que les parois latérales (12a, 12b) de l'armature (12) sont réalisées en un matériau ayant l'épaisseur d'une tôle, formé de façon à donner une section transversale (22) rigide en flexion pour une projection horizontale triangulaire (23).
10. Tête d'impression à aiguilles selon l'une des revendications 1 à 9, caractérisée en ce que le support de bobine (1), l'aimant permanent (5) et la couverture (7) en forme de disque sont reliés les uns aux autres dans des zones de surfaces planes en contact les unes avec les autres et disposées les unes sur les autres.
EP83730097A 1982-11-22 1983-10-10 Tête d'impression à aiguilles pour imprimante à matrice de points Expired EP0112275B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823243477 DE3243477A1 (de) 1982-11-22 1982-11-22 Nadeldruckkopf fuer matrixdrucker
DE3243477 1982-11-22

Publications (2)

Publication Number Publication Date
EP0112275A1 EP0112275A1 (fr) 1984-06-27
EP0112275B1 true EP0112275B1 (fr) 1986-03-05

Family

ID=6178920

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83730097A Expired EP0112275B1 (fr) 1982-11-22 1983-10-10 Tête d'impression à aiguilles pour imprimante à matrice de points

Country Status (4)

Country Link
US (1) US4552471A (fr)
EP (1) EP0112275B1 (fr)
JP (1) JPS5996975A (fr)
DE (2) DE3243477A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3502472A1 (de) * 1985-01-25 1986-07-31 Mannesmann AG, 4000 Düsseldorf Verfahren zum herstellen einer ankerbaugruppe fuer einen matrixdruckkopf
JPS6358909A (ja) * 1986-08-29 1988-03-14 エヌ・シー・アール・コーポレーション 磁性体の磁気バイアス方法
JPH0435176Y2 (fr) * 1986-11-25 1992-08-20

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2287340A1 (fr) * 1974-10-08 1976-05-07 Sagem Perfectionnements apportes aux dispositifs ou tetes d'impression pour imprimantes ou analogues et procede de fabrication d'une telle tete d'impression
SE7606042L (sv) * 1975-10-10 1977-04-11 Florida Data Corp Snabbarbetande elektromagnetiskt skrivhuvud
WO1979000738A1 (fr) * 1978-03-10 1979-10-04 Dh Ass Montage de tete imprimante d'une matrice
US4401392A (en) * 1979-05-14 1983-08-30 Blomquist James E Dot matrix print head
JPS5849192B2 (ja) * 1979-08-14 1983-11-02 日本電信電話株式会社 ドットプリンタ用印字ヘッド
FR2471279B1 (fr) * 1979-12-07 1987-07-17 Seikosha Kk Tete d'impression du type a bobine mobile
GB2064874B (en) * 1979-12-10 1984-10-17 Florida Data Corp Electromagnetic actuator for high speed dot matrix impact printer
JPS5856354B2 (ja) * 1980-03-12 1983-12-14 沖電気工業株式会社 ワイヤ印字ヘッド
JPS5784882A (en) * 1980-11-17 1982-05-27 Ibm Hammer mechanism

Also Published As

Publication number Publication date
US4552471A (en) 1985-11-12
DE3362456D1 (en) 1986-04-10
DE3243477A1 (de) 1984-05-24
DE3243477C2 (fr) 1987-09-10
JPH0227947B2 (fr) 1990-06-20
EP0112275A1 (fr) 1984-06-27
JPS5996975A (ja) 1984-06-04

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