EP0385047B1 - Tête d'impression matricielle comportant un support de bobine d'électro-aimant - Google Patents

Tête d'impression matricielle comportant un support de bobine d'électro-aimant Download PDF

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Publication number
EP0385047B1
EP0385047B1 EP89730052A EP89730052A EP0385047B1 EP 0385047 B1 EP0385047 B1 EP 0385047B1 EP 89730052 A EP89730052 A EP 89730052A EP 89730052 A EP89730052 A EP 89730052A EP 0385047 B1 EP0385047 B1 EP 0385047B1
Authority
EP
European Patent Office
Prior art keywords
electromagnetic coil
yoke
coil carrier
radially
magnet yoke
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
EP89730052A
Other languages
German (de)
English (en)
Other versions
EP0385047A1 (fr
Inventor
Johann Dipl.-Ing.(Fh). Stempfle
Bernd Dipl.-Ing.(Fh) Gugel
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 EP89730052A priority Critical patent/EP0385047B1/fr
Priority to DE8989730052T priority patent/DE58902829D1/de
Priority to AT89730052T priority patent/ATE82721T1/de
Priority to JP2049110A priority patent/JPH02266956A/ja
Priority to US07/487,545 priority patent/US5080510A/en
Publication of EP0385047A1 publication Critical patent/EP0385047A1/fr
Application granted granted Critical
Publication of EP0385047B1 publication Critical patent/EP0385047B1/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
    • 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

Definitions

  • the invention relates to a matrix print head with an electromagnetic coil carrier, which has a magnetic yoke ring for e.g. Forms 18- or 24-pressure element systems, in each of which the magnetic yoke bodies are fastened with yoke feet in polygonal recesses of the ring-shaped electromagnetic coil carrier and are aligned radially to the center of the electromagnetic coil carrier.
  • a magnetic yoke ring for e.g. Forms 18- or 24-pressure element systems, in each of which the magnetic yoke bodies are fastened with yoke feet in polygonal recesses of the ring-shaped electromagnetic coil carrier and are aligned radially to the center of the electromagnetic coil carrier.
  • the magnetic yoke body can be formed in one piece with the electromagnetic coil carrier, so that the economic efficiency of the manufacture comes to the fore over the expected tool costs.
  • the base body of the electromagnetic coil carrier can e.g. be made of magnetically non-conductive light metals, while the magnetic yoke body made of magnetically highly conductive materials such as are made of magnetically conductive sintered materials.
  • the present invention has for its object, with magnet system numbers over 14, e.g. with 18 or 24 printing elements, to achieve the smallest possible diameter of the matrix print head, with the magnetic yoke body securely attached to the base plate.
  • the yoke foot which is smaller in cross section than the cross section of the magnetic yoke body, is connected radially on the inside than radially on the outside and in that the yoke foot is glued or pressed into the polygonal recesses of the electromagnetic coil carrier.
  • the magnetic yoke bodies can be moved so far together with their width extension that their corner points touch radially on the inside, on the other hand, they diverge so far radially outside that the coil windings still find sufficient space there.
  • This space-saving arrangement is further favored radially asymmetrically by the laying of the support surface.
  • the yoke feet are each secured in such a way that each yoke foot is pressed in at a predetermined oversize and that it is glued in at a predetermined undersize.
  • pockets for adhesive be attached to the side edges of the recesses.
  • the type of fastening is also space-saving because the pockets for the adhesive do not take up any special space.
  • a reinforcement of the attachment and a more precise fit of the magnetic yoke body can also be achieved in that the magnetic yoke body in each case radially inside on a central hub of the Electromagnetic coil carrier are additionally defined in a recess in the central hub.
  • the insertion of the magnetic yoke body during assembly is carried out extremely precisely, whereby small tolerances can be maintained that the polygonal recesses of the electromagnetic coil carrier are pre-cast with the pockets and are subsequently stamped to the intended dimensions on parallel side boundaries.
  • FIGS. 6 to 8 have a needle guide housing 1 with printing needles 2 in a number 14, 18, 24 or more, and a guide mouthpiece 3 in which the printing needles 2 form several columns and are formed by means of needle guides, e.g. Rubies, ceramics, plastics or the like.
  • an electromagnetic coil housing 4 is held and fixed at a precise distance by means of a central screw 5 and closed by means of a cover 6.
  • an electromagnetic coil support 7 which is shown in more detail in FIGS. 6 to 8.
  • a magnetic yoke body 9 is provided on the electromagnetic coil carrier 7, on the radially outer magnetic yoke leg 9 a of which an electromagnetic coil 10 with a cable connection 11 is arranged.
  • the anchors 8 are held in two positions, one of which represents the rest position on a stop ring 12 and the other the opening position when a printing needle 2 generates a color point on a recording medium (not shown) via an ink ribbon (not shown).
  • the anchors 8 can be laminated and engage by means of projections 13 and 14 in slots 15 or cavities of the radially inner magnetic yoke leg 9b.
  • the magnetic yoke bodies 9 each form a yoke base 16, the cross section 16a (FIG. 4) of which is smaller than the overall cross section 17 of the magnetic yoke body 9.
  • the radially inner contact surfaces 18a are due to the eccentricity "e” (FIG. 2) and the radially outer bearing surfaces 18b of different sizes in order to cause polygonal recesses 19 to be laid radially outwards as far as possible where there is most space.
  • the radially inner bearing surface 18a is evidently larger and the radially outer bearing surface 18b is smaller.
  • the electromagnetic coil carrier 7 receives the yoke feet 16 in the polygonal recesses 19, on the side edges 20 of which pockets 21 for adhesive 22 are arranged.
  • the adhesive 22 can be seen particularly clearly in FIGS. 4 and 5.
  • the adhesive 22 consists of e.g. a commercially available adhesive, the brands AV 119 (Ciba Geigy) or Loctite 658.
  • the electromagnetic coil support 7, which is made of a light metal, such as is made of an aluminum alloy and is therefore magnetically non-conductive, has a central hub 23 which is provided with recesses 24 on the side of the polygonal recesses 19.
  • a recess 24 is located opposite each recess 19.
  • Such a recess 24 can be designed as a semicircular bulge or as an acute-angled incision
  • the depressions 24 on the central hub 23 are formed from ribs 26a and 26b parallel to a radial 25.
  • the distance between the parallel ribs 26a, 26b corresponds to a tolerated thickness 27 (FIG. 4) of the magnetic yoke body 9.
  • the thickness 27 is matched for the magnetic yoke body 9 to the polygonal recesses 19 of the electromagnetic coil carrier 7.
  • First the recesses 19 are cast with parallel side edges 20 and later punched onto parallel side boundaries 28, as shown in FIG. 8.
  • the solid lines form the finished dimensions, while the double dashed lines represent the punching.
  • coil feedthroughs 29 are provided.

Landscapes

  • Impact Printers (AREA)
  • Electromagnets (AREA)
  • Moving Of Heads (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)

Claims (5)

  1. Tête d'impression matricielle pourvue d'un support de bobines d'électroaimants, qui forme une couronne de culasses d'aimants pour, par exemple, 18 à 24 systèmes d'éléments d'impression, dans lesquels, à chaque fois, les corps de culasse d'aimant sont fixés par des pieds de culasse dans des ouvertures polygonales du support de bobines d'électroaimants annulaire et sont disposés radialement sur le centre du support de bobines d'électroaimants, caractérisée en ce que la section (16a) du pied de culasse (16) est plus petite que la section (17) du corps de culasse d'aimant (9), en ce que ledit pied de culasse présente radialement vers l'intérieur une surface d'appui (18a) plus grande que celle qui se trouve radialement vers l'extérieur et en ce que le pied de culasse (16) est fixé par collage ou par pression dans les ouvertures polygonales (19) du support de bobines d'électroaimants (7).
  2. Tête d'impression matricielle selon la revendications 1, caractérisée en ce que des poches (21) pour de la colle (22) sont prévues sur les bords latéraux (20) des ouvertures (19)
  3. Tête d'impression matricielle selon les revendications 1 et 2,
    caractérisée en ce que, à chaque fois, les corps de culasse d'aimant (9) sont, de plus, fixés vers l'intérieur à un moyeu central (23) du support de bobines d'électroaimants (7), dans une cavité (24) du moyeu central (23).
  4. Tête d'impression matricielle selon les revendications de 1 à 3,
    caractérisée en ce que les cavités (24) du moyeu central (23) sont constituées d'arêtes (26a, 26b) parallèles à une direction radiale (25).
  5. Tête d'impression matricielle selon les revendications 1, 2, 3 ou 4,
    caractérisée en ce que les ouvertures polygonales (19) du support de bobines d'électroaimants (7) sont préformées avec les poches (21) et sont estampées, par la suite, aux dimensions prévues avec des limites latérales parallèles (28).
EP89730052A 1989-03-01 1989-03-01 Tête d'impression matricielle comportant un support de bobine d'électro-aimant Expired - Lifetime EP0385047B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP89730052A EP0385047B1 (fr) 1989-03-01 1989-03-01 Tête d'impression matricielle comportant un support de bobine d'électro-aimant
DE8989730052T DE58902829D1 (de) 1989-03-01 1989-03-01 Matrixdruckkopf mit einem elektromagnetspulentraeger.
AT89730052T ATE82721T1 (de) 1989-03-01 1989-03-01 Matrixdruckkopf mit einem elektromagnetspulentraeger.
JP2049110A JPH02266956A (ja) 1989-03-01 1990-02-28 電磁石コイルボビンを有するマトリックス印字ヘッド
US07/487,545 US5080510A (en) 1989-03-01 1990-03-01 Matrix print head with an electromagnetic coil support

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP89730052A EP0385047B1 (fr) 1989-03-01 1989-03-01 Tête d'impression matricielle comportant un support de bobine d'électro-aimant

Publications (2)

Publication Number Publication Date
EP0385047A1 EP0385047A1 (fr) 1990-09-05
EP0385047B1 true EP0385047B1 (fr) 1992-11-25

Family

ID=8203112

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89730052A Expired - Lifetime EP0385047B1 (fr) 1989-03-01 1989-03-01 Tête d'impression matricielle comportant un support de bobine d'électro-aimant

Country Status (5)

Country Link
US (1) US5080510A (fr)
EP (1) EP0385047B1 (fr)
JP (1) JPH02266956A (fr)
AT (1) ATE82721T1 (fr)
DE (1) DE58902829D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5188466A (en) * 1991-06-27 1993-02-23 Mannesmann Aktiengesellschaft Matrix pin print head with rebound control
DE102004028904B4 (de) * 2004-06-15 2006-08-17 Tallygenicom Computerdrucker Gmbh Nadeldruckkopf für Matrixdrucker mit einem Druckkopfschlitten

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53133117A (en) * 1977-04-22 1978-11-20 Seikosha Kk Wire printer
US4214836A (en) * 1978-03-24 1980-07-29 Digital Equipment Corporation Impact print head
IT1099489B (it) * 1978-09-11 1985-09-18 Honeywell Inf Systems Testina stampante a matrice perfezionata
IT1131146B (it) * 1980-05-06 1986-06-18 Honeywell Inf Systems Mezzi di riduzione della diafonia in una testina stampante a mosaico
US4484170A (en) * 1983-02-25 1984-11-20 Ncr Corporation Dot matrix print head solenoid assembly
US4661002A (en) * 1983-08-19 1987-04-28 Canon Kabushiki Kaisha Dot matrix printer
JPH01299053A (ja) * 1988-05-27 1989-12-01 Tokyo Electric Co Ltd 釈放型ドツトプリンタヘツド

Also Published As

Publication number Publication date
EP0385047A1 (fr) 1990-09-05
DE58902829D1 (de) 1993-01-07
US5080510A (en) 1992-01-14
ATE82721T1 (de) 1992-12-15
JPH02266956A (ja) 1990-10-31

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