EP0157014B1 - Tête d'impression à aiguilles - Google Patents

Tête d'impression à aiguilles Download PDF

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Publication number
EP0157014B1
EP0157014B1 EP84116475A EP84116475A EP0157014B1 EP 0157014 B1 EP0157014 B1 EP 0157014B1 EP 84116475 A EP84116475 A EP 84116475A EP 84116475 A EP84116475 A EP 84116475A EP 0157014 B1 EP0157014 B1 EP 0157014B1
Authority
EP
European Patent Office
Prior art keywords
needle
hinged
support
leaf spring
printing head
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
EP84116475A
Other languages
German (de)
English (en)
Other versions
EP0157014A3 (en
EP0157014A2 (fr
Inventor
Hermann Kohlhage
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.)
Siemens Nixdorf Informationssysteme GmbH
Original Assignee
Wincor Nixdorf International GmbH
Nixdorf Computer 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 Wincor Nixdorf International GmbH, Nixdorf Computer AG filed Critical Wincor Nixdorf International GmbH
Publication of EP0157014A2 publication Critical patent/EP0157014A2/fr
Publication of EP0157014A3 publication Critical patent/EP0157014A3/de
Application granted granted Critical
Publication of EP0157014B1 publication Critical patent/EP0157014B1/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
    • B41J2/275—Actuators for print wires of clapper type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/14—Pivoting armatures

Definitions

  • the invention relates to a wire dot print head according to the preamble of claim 1.
  • the anchor piece is fastened to a pole shoe connected to a yoke leg via two intersecting leaf springs.
  • the extension is shaped like a piece of cake and bent from a sheet metal blank, the side flanks of the extension connected to one another by a triangular top and bottom each being provided with openings in order to save weight.
  • the solenoid coil is not energized, the hinged armature is held in its rest position by a permanent magnet, the springs being tensioned.
  • the anchor piece closes the rectangular magnetic circuit of the magnetic drive in a corner of the magnetic circuit, in which the two pole shoe surfaces facing the anchor piece are directed perpendicular to one another.
  • the attraction of the permanent magnet is canceled by excitation of the magnet coil, so that the hinged armature with the pressure needle attached to it is pivoted by the relaxing springs.
  • the hinged anchor is caught by the permanent magnet, which is then effective again.
  • the anchor piece of this hinged anchor is of relatively complicated shape, since it must offer a possibility for fastening the two crossing leaf springs and must fit into the corner of the magnetic circuit.
  • the assembly of the hinged anchor is relatively complex because the pivot axis of the hinged anchor is defined solely by the intersection of the planes of the intersecting leaf springs. The assembly must therefore be carried out very carefully in order to achieve the same position of the swivel axis in all magnetic drives of the needle print head. Since the hinged armature is actuated by the relaxing springs, these springs must be strong in the relatively long lever arm in order to achieve actuation of the hinged armature at high speed. The hinged anchor returns to its rest position against the force of the springs and is slower the stronger the springs are. In order to quickly return the hinged anchor to its rest position and keep it there securely, a strong permanent magnet is required, which also needs a corresponding space.
  • a needle printhead in which the hinged armature of the magnetic drives including the extension each consist of a single iron part.
  • This hinged anchor has notches on its longitudinal edges, into which webs of the printhead chassis engage in order to fix the hinged anchor against radial displacement.
  • the hinged armature In its rest position, the hinged armature lies against the radially inner edge of the radially inner yoke leg of the hinged armature magnet and is pressed against this inner edge by an O-ring.
  • the hinged anchor rests loosely in a conventional manner on a head of the pressure needle, which is biased into its rest position by a helical compression spring engaging the needle head.
  • the hinged armature magnet If the hinged armature magnet is actuated, the radially outer end of the hinged armature is pulled against the radially outer yoke leg. Because of its mass, the hinged armature lifts off the inner yoke leg, so that the pivot axis which initially lies on the radially inner edge of the radially inner yoke leg now lies on the radially outer edge of the radially outer yoke leg. The radially inner end of the hinged anchor slides on the needle head.
  • This solution has several disadvantages. On the one hand, the hinged anchor has a relatively large mass, so that a correspondingly large mass must be accelerated to actuate the pressure needle.
  • the generation of the notches in the hinged anchor in the material usually used for these hinged anchors causes manufacturing difficulties.
  • the hinged anchor has no defined pivot axis, which results in constantly changing lever ratios on the hinged anchor during operation. Since the hinged anchor is only clamped between a yoke leg edge and an O-ring in its rest position, it tends to swing and rattle.
  • the wear of the head of the print wire essentially limits the life of the entire wire print head. This wear occurs on the one hand due to friction between the compression spring and the needle head and on the other hand due to friction between the needle head and the hinged anchor.
  • the compression springs easily fatigue, which can lead to spring breakage.
  • the large mass of the hinged anchor, the changing position of the swivel axis and the not exactly defined rest position of the hinged anchor limit the operating speed.
  • a magnetic drive for a printing hammer which itself consists of an upright angle profile which is fastened to a leaf spring and is connected to an anchor piece.
  • the leaf spring is firmly clamped with its free end remote from the printing end of the printing hammer on a housing part of the printing device.
  • the print hammer has a small mass, but no defined pivot axis. The type of storage of the print hammer easily leads to the latter swinging or fluttering on rebound from the recording medium.
  • the invention has for its object to provide a needle print head of the generic type with low-mass, simple and inexpensive to manufacture and assemble folding anchors, which have a progressive and low-wear return spring while maintaining a defined pivot axis and enable a high working speed.
  • the extension of the hinged anchor is very low in mass and yet stable. Due to the radially inward-pointing leaf spring, the radial dimension required for the hinged anchors and their storage is small.
  • the hinged anchor In connection with a central abutment for the free end of the extension carrying the pressure needle, the hinged anchor is held on the yoke leg edge defining the pivot axis in such a way that the hinged anchor is supported on the magnetic yoke and the abutment on the one hand and with the leaf spring on the support on the other.
  • the leaf spring has an opening at its ends resting on the support for the passage of a holding pin connected to the support.
  • the support for the leaf spring can be adjustable in height in order to be able to adjust the restoring force acting on the folding anchor. This can be done in a simple manner in that the support is formed by a screw which can be screwed into a base plate of the needle print head connected to the mouthpiece. By unscrewing more or less from the base plate, the leaf spring is more or less bent, so that the restoring force acting on the hinged anchor is changed.
  • the leaf spring and the legs of the extension are preferably formed in one piece with one another, for example by punching them together from a spring steel sheet and welding them to the anchor piece after bending, as will be described in more detail below using an exemplary embodiment.
  • FIG. 1 shows in a half section containing the axis a needle print head with a folding armature magnet, generally designated 10.
  • This comprises a magnet coil 12 which is attached to a leg 14 of a U-shaped magnet yoke 16 which, together with the other U leg 18, is formed in one piece with a bearing or carrier plate 20.
  • 4 carries a plurality of such magnetic yokes 16 in a circular arrangement around a common central axis 22, the U-legs of the magnetic yokes 16 being arranged radially one behind the other.
  • a hinged armature 24 is supported such that it can be tilted about a tilt axis 26 extending in an outer edge of the yoke leg 18.
  • Each hinged anchor 24 rests on a toroidal rubber ring 28, which is held coaxially to the central axis 22 on a base plate 30 of the needle print head.
  • the base plate 30, is connected to an axial needle guide 32, which carries at its free end a mouthpiece 34 through which the pressure needles 38, which can be actuated by radially oriented extensions 36 of the hinged armature 24, can emerge.
  • the carrier plate 20 has a circumferential cylindrical edge 40 which, when the carrier plate 20 is placed on the base plate 30, bears on the latter and forms a cylindrical housing wall of the needle print head.
  • the magnet coils 12 are connected via wires 42 to a printed circuit board 44, which carries a circuit suitable for controlling the hinged armature magnets of the needle print head.
  • the hinged anchor consists of a soft iron part punched out, for example.
  • This iron part is connected to the pressure needle 38 via the extension 36.
  • the extension 36 consists of two spring legs 46, which are connected at one end via a bridge 48 and directly abut one another at their free ends and are connected there with the pressure needle 38, so that the triangular shape shown in FIG. 3 results .
  • a spring tongue 50 which has an opening 52 at its free end, extends from the bridge 48 in the direction of the pressure needle 38.
  • the extension 36 together with the spring tongue 50 can be produced from the spring plate blank 54 shown in FIG. 2 by the spring legs 46 are bent at right angles about bending lines 56 and the free ends of the spring legs 46 are connected to one another.
  • the part thus formed is placed on the armature 24 in the manner shown in FIG. 3 and welded to the armature 24 in the region of the rear extensions 60 of the spring legs 46.
  • the folding anchor produced in this way and connected to the pressure needle 38 is placed on the rubber ring 28, the pressure needle 38 being inserted into the needle guide 32 and the mouthpiece 34.
  • the spring tongue 50 is suspended on a retaining pin 62 of a support pin 64, which is screwed into the base plate 30 parallel to the axis 22 by means of an external thread 66. With its free end, the extension 36 of the hinged armature 24 bears against a central abutment 68 common to all hinged armature magnets.
  • the support pin 64 by suitably adjusting the support pin 64, the hinged armature 24 is also held on the yoke leg 18 when the ring 28 is not present.
  • the preload of the spring tongue 50 can be adjusted by adjusting the height of the support surface 70 of the support pin 64.
  • the above description shows that the spring part forming the extension 36 and the spring tongue 50 is easy to manufacture and can be connected to the hinged anchor 24.
  • the hinged armature 24 is therefore very low in mass, so that it offers the possibility of a higher working frequency or a reduction in the dimensions of the electromagnets 10. Nevertheless, the hinged anchor has sufficient stability.
  • the spring legs 46 lie with their plane parallel to the pin axis, so that they behave practically rigid when moving in the direction of the axis of the pin 38.
  • hinged armature magnets 24 In order to prevent lateral movement of the hinged armature magnets 24, it is expedient to insert the hinged armatures between two lateral boundaries 70, which can be formed, for example, by ribs connected to the base plate 30.
  • legs 46 need not necessarily be made of spring steel. Under certain circumstances, a normal sheet material without elastic properties is sufficient.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Impact Printers (AREA)

Claims (6)

1. Tête d'impression à aiguilles comprenant une pluralité d'éléments d'actionnement magnétique (10) disposés en cercle autour d'un guide d'aiguille (32) central ayant une embouchure (34) constitués chacun d'une culasse d'aimant (16) en U, d'une bobine magnétique (12) entourant une branche de culasse (14) et d'une armature battante (24) en combinaison structurelle, dans lesquels une pièce d'armature est réunie avec une lame de ressort (50) supportée d'un seul côté et un prolongement (36) auquel est fixée l'aiguille d'impression (38), caractérisée en ce que le prolongement (36) se compose de deux branches (46) placées sur champ et en ce que la lame de ressort (50), qui appuie l'armature battante (24) à sa position de repos contre une butée (68) centrale commune à toutes les armatures flottantes (24), s'étend en partant de la pièce d'armature jusqu'à la butée (68) et s'appuie contre un support (64) qui est situé en sens radial entre la butée (68) et une arête d'une branche de culasse constituant l'axe de pivotement (26) de l'armature flottante (24).
2. Tête d'impression à aiguilles selon la revendication 1, caractérisée en ce que la lame de ressort (50) présente à son extrémité reposant sur le support (64) une ouverture (52) pour le passage d'un téton de maintien (62) lié au support (64).
3. Tête d'impression à aiguilles selon la revendication 1 ou 2, caractérisée en ce que les branches (46) du prolongement (36) reliées l'une à l'autre par leurs extrémités libres ainsi qu'à l'aiguille d'impression (38) sont faites en une seule pièce avec la lame de ressort (50) et sont pliées à partir d'une pièce (54) découpée dans une tôle d'acier à ressort.
4. Tête d'impression à aiguilles selon l'une des revendications 1 à 3, caractérisée en ce que la lame de ressort (50) a la configuration d'une languette élastique qui s'étend dans l'espace libre de la partie découpée entre les branches (46) du prolongement (36) se rapprochant l'une de l'autre jusqu'à l'aiguille d'impression (38) de part et d'autre du support (64).
5. Tête d'impression à aiguilles selon l'une des revendications 1 à 5, caractérisée en ce que le support (64) pour la lame de ressort (50) est déplaçable en hauteur.
6. Tête d'impression à aiguilles selon la revendication 5, caractérisée en ce que le support (64) est conformé en tige de support vissable à filetage extérieur (66) et peut être vissé dans une plaque de base (30) de la tête d'impression à aiguilles reliée à l'embouchure (32, 34).
EP84116475A 1984-04-03 1984-12-28 Tête d'impression à aiguilles Expired EP0157014B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843412429 DE3412429A1 (de) 1984-04-03 1984-04-03 Klappankermagnet fuer nadeldruckkopf
DE3412429 1984-04-03

Publications (3)

Publication Number Publication Date
EP0157014A2 EP0157014A2 (fr) 1985-10-09
EP0157014A3 EP0157014A3 (en) 1986-08-27
EP0157014B1 true EP0157014B1 (fr) 1989-10-04

Family

ID=6232501

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84116475A Expired EP0157014B1 (fr) 1984-04-03 1984-12-28 Tête d'impression à aiguilles

Country Status (2)

Country Link
EP (1) EP0157014B1 (fr)
DE (2) DE3412429A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0338176B1 (fr) * 1988-04-22 1993-06-23 MANNESMANN Aktiengesellschaft Tête d'impression pour imprimante matricielle à aiguilles
DE3922993A1 (de) * 1989-07-10 1991-01-24 Mannesmann Ag Matrixdruckkopf

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3040399A1 (de) * 1979-12-10 1981-06-11 Florida Data Corp., West Melbourne, Fla. Hochgeschwindigkeits-punktmatrix-drucker

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE372118B (fr) * 1973-05-30 1974-12-09 Facit Ab
SE404898B (sv) * 1976-10-11 1978-11-06 Facit Ab Anordning for punktformig paverkan av ett informationsberande medium
JPS5835474B2 (ja) * 1977-05-26 1983-08-02 エプソン株式会社 ワイヤ式ドツトプリンタヘツドの構造
US4230038A (en) * 1977-06-23 1980-10-28 Helmut Falk Matrix print head assembly
DE2800218C2 (de) * 1978-01-04 1980-02-07 Triumph Werke Nuernberg Ag, 8500 Nuernberg Nadeldruckkopf
US4248540A (en) * 1979-04-13 1981-02-03 Florida Data Corporation Printer arm
GB2066740B (en) * 1979-12-07 1983-11-09 Seikosha Kk Moving coil type printing head
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
DE3202976C2 (de) * 1982-01-29 1986-04-03 Siemens AG, 1000 Berlin und 8000 München Anordnung für eine verschleißkompensierende Betätigung von Drucknadeln eines Nadeldruckkopfes

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3040399A1 (de) * 1979-12-10 1981-06-11 Florida Data Corp., West Melbourne, Fla. Hochgeschwindigkeits-punktmatrix-drucker

Also Published As

Publication number Publication date
EP0157014A3 (en) 1986-08-27
DE3412429A1 (de) 1985-10-10
EP0157014A2 (fr) 1985-10-09
DE3479986D1 (en) 1989-11-09
DE3412429C2 (fr) 1987-07-02

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