EP0188672B1 - Tête d'impression en matrice - Google Patents

Tête d'impression en matrice Download PDF

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Publication number
EP0188672B1
EP0188672B1 EP85113395A EP85113395A EP0188672B1 EP 0188672 B1 EP0188672 B1 EP 0188672B1 EP 85113395 A EP85113395 A EP 85113395A EP 85113395 A EP85113395 A EP 85113395A EP 0188672 B1 EP0188672 B1 EP 0188672B1
Authority
EP
European Patent Office
Prior art keywords
magnetic drive
passage opening
printing
drive element
needles
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
EP85113395A
Other languages
German (de)
English (en)
Other versions
EP0188672A1 (fr
Inventor
Bernd Dipl.-Ing. Gugel
Horst Heisele
Herbert Kitzberger
Karl Mayer
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
Priority to AT85113395T priority Critical patent/ATE47091T1/de
Publication of EP0188672A1 publication Critical patent/EP0188672A1/fr
Application granted granted Critical
Publication of EP0188672B1 publication Critical patent/EP0188672B1/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
    • B41J2/235—Print head assemblies
    • B41J2/25—Print wires
    • B41J2/26—Connection of print wire and actuator

Definitions

  • the invention relates to a matrix printhead with a plurality of printing needles, each of which can be moved forwards and backwards in the printing position by means of a separate magnetic drive, and which are fastened to an element of the magnetic drive that transmits the movements, the magnetic drive element each having a width within the fastening region, which arrangement is arranged centrally in the Fastening area of the magnetic drive element located passage opening, the basic cross-sectional shape of which corresponds at least to a part of the circumference of the inserted and soft or brazed pressure needles, taking into account a corresponding manufacturing tolerance.
  • Such matrix print heads are manufactured in serial and line printer type. The operation is aimed at the highest possible number of prints of individual dot printing elements.
  • Serial matrix printers already achieve a writing performance of approx. 400 characters / sec and line printers of up to 900 characters / sec. In accordance with these writing capacities, matrix character printers are subject to thermal and wear-related stress. The service life and any downtime of the matrix printer are, however, decisive features for the user to select a matrix printer.
  • a first type of construction also uses the principle of the motion-transmitting magnetic drive element, but preferably only a kinematic coupling by frictional connection between the magnetic drive element (e.g. a hinged armature) and a separate pressure needle to which a head is attached. During the transmission of force, the head of the printing needle lies against a flat surface of the magnetic drive element.
  • this first type follows the frequency of the magnetic drive only with difficulty because of the mass inequality of the pressure needle with the pressure pin head on the one hand and the mass of the hinged armature on the other hand. Vibration problems and control problems are therefore associated with the first type (such an example is the subject of US Pat. No. 4,478,528).
  • a second type avoids the problems of the first type in that the pressure needles are each attached directly and rigidly to the front end of the magnetic drive element.
  • the print needle thus necessarily follows the control of the matrix printer electronics.
  • This second type (an example can be seen from DE-OS 26 30 931) is difficult to master in terms of production technology.
  • the attachment of the printing needle requires special auxiliary devices, but there is still the risk that the alignment and arrangement of the printing needles is inadequate due to the tolerance of the auxiliary devices being too great.
  • Another disadvantage of the known fastening is the extremely important connection of the pressure needles to the magnetic drive element, which occurs under the influence of heat during soft or hard soldering. In extreme cases, the heating of the printing needles during inductive soldering can lead to the printing needle breaking after a relatively short operating time of the matrix printer. The reason for this is a structural change in the material of the pressure needles either during the heating or during the subsequent cooling.
  • Another known proposal (DE-A 25 58 380) provides for a fastening of a printing needle, as described in the introduction.
  • the axis of the passage opening is guided vertically through either the straight or angled magnetic drive element, so that the pressure needle is subjected to an adverse curvature, which must be fixed in guides, so-called support planes, not shown.
  • the known printing needle attachment is disadvantageous due to an external welding at an outwardly projecting end of the printing needle. Such an attachment is therefore at risk of breakage.
  • the invention is therefore based on the object of improving the attachment of a printing needle, and to reinforce it.
  • the object is achieved according to the invention in that the straight axis of the passage opening runs obliquely to the surface plane of the magnetic drive element, that the manufacturing tolerance of the passage opening allows easy insertion of the printing needles and their fixing in the direction, and that the printing needle is soldered within the resulting gap of the passage opening are.
  • the minimum width of the magnetic drive element ensures the arrangement of a passage opening.
  • the passage opening itself ensures the least possible effort to position the pressure needle during assembly.
  • the accuracy of the position is particularly advantageous here.
  • the pressure needle is also not excessively weakened in its material strength when it is necessary to heat it, since the surrounding material of the magnetic drive element for slow heat dissipation ensures. This creates a significant reinforcement of the attachment.
  • the passage opening consists of a circular hole made by means of laser beams with a minimum diameter of 0.2 mm to a maximum of 0.4 mm.
  • the position of the individual printing needles is fixed with high accuracy solely through this bore.
  • the passage opening is formed in the form of a slot running from the front or to the side with a width which corresponds to the thickness of the printing needles which can be inserted from the front or from the side, taking into account a corresponding manufacturing tolerance for the slot and / or the printing needle dimension.
  • the pressure needle can be easily inserted laterally.
  • the printing pins are fixed by filling the slot with soft or hard solder.
  • FIGS. 1 and 2 serve to explain the functions of a (serial) matrix printhead as an example in order to precede the interaction of an armature assembly with other function groups within the overall matrix printhead of the description of the manufacturing process of the armature components.
  • the serial matrix print head shown in the drawing has an electromagnetic coil assembly 1, which consists of a magnetic flux guide plate 2, magnetic pole cores 3 fastened thereon with electromagnetic coils 4 and a permanent magnet plate 5.
  • the electromagnetic coil assembly 1 is opposite an armature assembly 6, which consists of an armature ring 7, (in the drawing) to the left and to the right according to FIG. 1 armature arms 8, the armature arms 8 each by means of relatively short spring arms 9 with the Anchor ring 7 are connected.
  • the number of magnetic pole cores 3 of the electromagnetic coils 4, the armature arms 8 and the spring arms 9 corresponds, as usual, to the number of pressure elements 10, which in the exemplary embodiment are designed as relatively long pressure needles and are stored in a mouthpiece 11.
  • there are 2 x 12 24 pressure elements within the electrically or magnetically non-conductive housing 12, which is composed of the two housing parts 12a and 12b and is held together by means of screws 13 distributed over the housing circumference.
  • the pressure elements 10 are guided around the pressure path (approx. 0.3 to 0.6 mm) essentially axially movable in a guide housing 14 in bearings 15. Supplements 17 are located between the housing 12 and the guide housing 14 in order to determine the exit length of the pressure elements 10 from the guide housing 14 and also to be able to change them later.
  • the guide housing 14 also serves to fasten the matrix print head on a carriage (not shown) or the like, which is moved back and forth in front of a pressure abutment.
  • a flange 14a and at least two dowel pins 14b are provided for fastening.
  • An uncritical, parasitic air gap 20 is provided, the size of which, with the slightest deviations, can have a negative influence on the magnetic flux density and thus on the energy transmission and the buildup and breakdown of the electromagnetic fields or the permanent magnetic fields.
  • the air gap 20 is not critical if the air in the gap 20 is optimally magnetized. Such an optimal magnetization of the air gap 20 is present when the air gap is dimensioned so large that on the one hand no tight tolerances for the manufacture of the anchor ring 7 or the anchor arms 8 have to be required and on the other hand the field line density is indeed large enough to accommodate the pretensioning force the spring arms 9 to keep the balance, but on the other hand is not too high to hinder a rapid breakdown of the permanent magnetic field when switching on the electromagnetic coils 4.
  • An intermediate plate 24 arranged between the magnetic flux guide plate 2 and the armature ring 7 forms with its end face 24a a uniform plane 25 (FIG. 2), the armature ring 7 resting against the intermediate plate 24 in this plane 25 when housing parts 12a and 12b are connected.
  • the armature arms 8 lie in the retracted position (as shown in FIG. 1) at a slight angle to the plane 25 and rest on the associated magnetic pole cores 3.
  • the thickness of the anchor ring 7 corresponds approximately to the thickness of the anchor arms 8 including the relatively small thickness the spring arms 9, which are connected to the anchor arms 8 and the anchor ring 7.
  • the very short spring arm 9 receives a shortened clamping length through a gradation 7a, so that the remaining anchor ring surface 7b is available for the connection.
  • the gradation 7a additionally causes freedom of bending for the armature arm 8.
  • the gradation 7a provides u. U. is a continuation of the air gap 20.
  • the short spring arms 9 made of antimagnetic material, e.g. B. chromium-nickel steel, so that no magnetic field lines can run over the spring arms 9 or over the space of the gradation 7a.
  • antimagnetic material e.g. B. chromium-nickel steel
  • a further limitation of stray fluxes or a concentration of the magnetic field lines is carried out by the magnetic flux guide plate 2, which ends opposite the side of the pressure elements 10 approximately at the level of the magnetic pole cores 3.
  • the printing needles 10 (FIGS. 3 and 4) are attached directly and rigidly to the magnetic drive element 26 (these correspond to the armature arms 8) with their circumference 10a by means of soft or hard soldering 27. This attachment has proven to be disadvantageous as described.
  • a magnetic drive element 26 which has a fastening region 27 with a width 28 which corresponds at least to the simple thickness 29 (diameter) of the printing needle 10.
  • a passage opening 30 is provided with a cross-sectional shape adapted to the respective basic cross-sectional shape 31 (circle, rectangle, square) of the printing needle 10 while observing a corresponding manufacturing tolerance.
  • the cross-sectional shape 31 is present on at least part of the circumference 32, so that the pressure needle 10 is fixed.
  • the embodiment shows a passage opening 30 from a circular bore from a minimum of 0.2 mm to a maximum of 0.4 mm, z. B. can be easily inserted with a circular cross section of printing needle 10 of 0.36 mm in diameter and a gap that is formed can be filled with hard or soft solder.
  • the axis 33 of the pressure needle 10 or the pressure opening 30 extends at an angle 34 to the surface plane 35 of the magnetic drive element 26.
  • FIG. 5 An alternative embodiment of the attachment can now consist (FIG. 5) that the passage opening 30 is formed in the form of a slot 36 which is worked in from the side (or from the front) and has a width which corresponds to the thickness (diameter) 29 of the printing needle 10, so that the printing needle 10 can be inserted laterally (or from the front).
  • the slot 36 is closed with soft or hard solder after the insertion of the pressure needle 10.
  • the alternative fastening also ensures a precise position by the pressure needle 10 resting with its part of the circumference 32 on the wall of the passage opening 30.

Landscapes

  • Impact Printers (AREA)
  • Facsimile Heads (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Claims (3)

1. Tête d'impression à matrice, avec plusieurs aiguilles d'impression (10) chacune mobile en avant vers la position d'impression et en arrière, au moyen d'un entraînement magnétique séparé, et fixée sur un élément (26) de l'entraînement magnétique, transmettant les mouvements, l'élément d'entraînement magnétique (26) présentant chaque fois à l'intérieur de la zone de fixation (27) une largeur (28) qui admet un orifice de passage (30) se trouvant au centre de la zone de fixation (27) de l'élément d'entraînement magnétique (26), orifice dont la forme de base de la section transversale (31) coïncide au moins avec une partie de la périphérie (32) des aiguilles d'impression (10) utilisées et brasées de manière tendre ou forte, en prenant en compte une tolérance de fabrication correspondante, caractérisée en ce que l'axe droit (33) de l'orifice de passage (30) s'étend en biais par rapport au plan de la surface (35) de l'élément d'entraînement magnétique (26), qu'en outre la tolérance de fabrication de l'orifice de passage (30) permet une introduction facile des aiguilles d'impression (10) et leur fixation en direction et que les aiguilles d'impression (10) sont brasées à l'intérieur de la fente apparaissant dans l'orifice de passage (30).
2. Tête d'impression à matrice selon la revendication 1, caractérisée en ce que l'orifice de passage (30) se compose d'un alésage circulaire fabriqué au moyen d'un rayonnement Laser, présentant un diamètre allant d'un minimum de 0,2 mm à un maximum de 0,4 mm.
3. Tête d'impression à matrice selon les revendications 1 et 2, caractérisée en ce que l'orifice de passage (30) est formé sous la forme d'une fente (36) s'étendant depuis l'avant ou latéralement, avec une largeur correspondant à l'épaisseur (29) des aiguilles d'impression (10) introductibles depuis l'avant ou latéralement, en prenant en compte une tolérance de fabrication correspondante pour la fente (36) et/ou la dimension de l'aiguille d'impression.
EP85113395A 1985-01-25 1985-10-22 Tête d'impression en matrice Expired EP0188672B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85113395T ATE47091T1 (de) 1985-01-25 1985-10-22 Matrixdruckkopf.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3502471 1985-01-25
DE19853502471 DE3502471A1 (de) 1985-01-25 1985-01-25 Matrixdruckkopf

Publications (2)

Publication Number Publication Date
EP0188672A1 EP0188672A1 (fr) 1986-07-30
EP0188672B1 true EP0188672B1 (fr) 1989-10-11

Family

ID=6260760

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85113395A Expired EP0188672B1 (fr) 1985-01-25 1985-10-22 Tête d'impression en matrice

Country Status (4)

Country Link
EP (1) EP0188672B1 (fr)
JP (1) JPS61172752A (fr)
AT (1) ATE47091T1 (fr)
DE (2) DE3502471A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5174664A (en) * 1985-01-25 1992-12-29 Mannesmann Ac. Armature with angled bore for print needle fastening
JPH0616756Y2 (ja) * 1988-09-01 1994-05-02 沖電気工業株式会社 ワイヤドット印字ヘッドのアーマチュア

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2056364B2 (de) * 1970-11-17 1976-05-13 Offermann, Karl Heinz, 4322 Sprockhövel Elektromagnetsystem fuer mosaik- druckwerke
DE2317345A1 (de) * 1973-04-06 1974-10-24 Philips Patentverwaltung Elektromagnetischer nadeldrucker
DE2449235A1 (de) * 1973-12-11 1975-06-12 Gen Electric Druckvorrichtung mit drahtmatrixdruckerkopf
DE2558380A1 (de) * 1975-12-23 1977-07-07 Ncr Co Vorrichtung zum punktweisen einwirken auf einen informationstraeger
US4206266A (en) * 1977-12-27 1980-06-03 Florida Data Corporation Printer arm blank
DE2943440C2 (de) * 1979-10-26 1984-09-06 Nixdorf Computer Ag, 4790 Paderborn Klappankermagnet

Also Published As

Publication number Publication date
DE3573561D1 (en) 1989-11-16
DE3502471A1 (de) 1986-07-31
ATE47091T1 (de) 1989-10-15
JPS61172752A (ja) 1986-08-04
EP0188672A1 (fr) 1986-07-30

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