EP0466286A1 - Matrixnadeldruckkopf - Google Patents

Matrixnadeldruckkopf Download PDF

Info

Publication number
EP0466286A1
EP0466286A1 EP91250103A EP91250103A EP0466286A1 EP 0466286 A1 EP0466286 A1 EP 0466286A1 EP 91250103 A EP91250103 A EP 91250103A EP 91250103 A EP91250103 A EP 91250103A EP 0466286 A1 EP0466286 A1 EP 0466286A1
Authority
EP
European Patent Office
Prior art keywords
needle
printing
head
pressure
matrix
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.)
Ceased
Application number
EP91250103A
Other languages
German (de)
English (en)
French (fr)
Inventor
Johann Stempfle
Bernd 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
Publication of EP0466286A1 publication Critical patent/EP0466286A1/de
Ceased legal-status Critical Current

Links

Images

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 needle printhead with a plurality of pressure needles, each of which can be moved forward in the printing position by means of a separate magnetic drive, which abuts an element of the magnetic drive which transmits the forward movements and can each be moved back by means of spring force, each printing needle having a pressure needle head rigidly connected to it.
  • pressure needles are known in which the pressure needle head is connected to a steel ball and a hemisphere or a disk made of metal, each of which is encapsulated with plastic.
  • the shape of the pressure pin head then corresponds to a cylinder with a spherical contact surface opposite the adjacent arm.
  • the invention has set itself the task of reducing the wear on such print head.
  • the stated object is achieved, based on the matrix needle printhead mentioned at the outset, in that at the pressure needle end the pressure needle head consists of a technical ceramic material and is designed as a shaped piece, the inside of which the pressure needle end is glued, pressed or sintered, and that the connection length is at least twice that Corresponds to the diameter of the printing needle.
  • Such a design considerably reduces the wear that occurs between a magnetically conductive material (armature) and the ceramic needle head. It is particularly advantageous here that ceramic materials can be provided with a very dense and very smooth surface quality.
  • the ceramic material consists of aluminum oxide and zirconium oxide.
  • the pressure pin head can be shaped particularly advantageously as a shaped piece and has great hardness and a high surface quality as a finished piece.
  • the pressure needle head forms two side cheeks, between which an armature of the magnetic drive engages, a curved bearing surface for the armature being formed.
  • Such a pressure pin head can likewise advantageously be produced as a molded part with a still soft mass of the ceramic material and, as a finished part, is particularly hard and reduces wear.
  • connection length corresponds to at least twice the diameter of the printing needle, so that a strong connection is created between the printing needle and the printing needle head.
  • This fixed connection between the pressure needle end and the pressure needle head advantageously allows the spring force for the return movement of the pressure needle to be formed by means of a leg spring which engages under the pressure needle head with a spring leg facing the armature.
  • the matrix print head shown in FIG. 1 represents a serial matrix needle print head which is arranged with a needle stroke distance 1 opposite a print abutment 2.
  • a recording medium 3 On the pressure abutment 2, a recording medium 3 is fully seated.
  • the printing needles 4 form one or more vertical needle gaps in the mouthpiece 5, e.g. 2 x 9 or 2 x 12 printing needles.
  • the printing needles 4 are held and guided in their entirety in a printing needle guide housing 7 with support bearings 8.
  • the printing needles 4 extend into a rear printing needle drive housing 9, which is closed by a cover 10.
  • the cover 10 has cooling fins 11 for dissipating heat generated by magnetic drives 12.
  • Such a magnetic drive 12 is assigned to each print needle 4 in the print needle drive housing 9.
  • the magnetic drive 12 each has a magnetic yoke 13.
  • Each magnetic yoke 13 consists of two magnetic yoke legs 13a and 13b and a magnetic yoke base 13c.
  • An electromagnetic coil 14 is pushed onto a magnetic yoke leg 13a or 13b.
  • Each magnet drive 12 also includes an armature 15, which can be pivoted by means of a pin bearing 16 and bears in a rearward position against a stop 18 by means of a spring 17, a working air gap 20 being formed between the armature 15 and a magnet yoke leg end face 19.
  • Each printing needle 4 carries a printing needle head 22 at a rear printing needle end 21 (FIGS. 2 to 5).
  • the pressure needle head 22 is formed from a technical ceramic material and designed as a shaped piece 23, the inside of the pressure needle end 21 being glued, pressed or sintered, this connection length 25 being at least that The pressure needle 4 corresponds to twice the diameter 26.
  • the shaped piece 23 is produced as a ceramic material from aluminum oxide and zirconium oxide.
  • the print needle head 22 forms two side cheeks 27a and 27b. Both side cheeks 27a and 27b are at a distance, so that the movement-transmitting element 15 (armature 15a) forms a lateral guide for the thickness of the armature 15a.
  • armature 15a the movement-transmitting element 15
  • a curved contact surface 28 is arranged between the two side cheeks 27a and 27b, on which the armature 15a can roll.
  • a cylindrical printing needle 4 is fastened directly in the printing needle head 22 with an end face 29 running perpendicular to the printing needle axis.
  • the spring force for moving the printing needle 4 back from a printing position on the platen 2 or the recording medium 3 or the ink ribbon 6 into a non-printing rest position is applied by means of a leg spring 30, each with a spring leg 31 facing armature 15a engages under pressure pin head 22.
  • the leg spring 30 has an opening 32 on the spring leg 31 which is correspondingly larger than the diameter 26 of the pressure needle 4.
  • the diameter 26 of the pressure needle 4 is otherwise e.g. 0.25 or 0.18 mm, so that the opening 32 is dimensioned accordingly.

Landscapes

  • Impact Printers (AREA)
EP91250103A 1990-06-20 1991-04-16 Matrixnadeldruckkopf Ceased EP0466286A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4020015A DE4020015C1 (enrdf_load_stackoverflow) 1990-06-20 1990-06-20
DE4020015 1990-06-20

Publications (1)

Publication Number Publication Date
EP0466286A1 true EP0466286A1 (de) 1992-01-15

Family

ID=6408920

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91250103A Ceased EP0466286A1 (de) 1990-06-20 1991-04-16 Matrixnadeldruckkopf

Country Status (4)

Country Link
US (1) US5137381A (enrdf_load_stackoverflow)
EP (1) EP0466286A1 (enrdf_load_stackoverflow)
JP (1) JPH04232759A (enrdf_load_stackoverflow)
DE (1) DE4020015C1 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10305038A1 (de) 2003-02-07 2004-08-19 Pfeiffer Vacuum Gmbh Vakuumpumpanordnung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4230412A (en) * 1978-03-17 1980-10-28 Helmut Falk Matrix print head assembly
EP0067542A1 (en) * 1981-06-04 1982-12-22 Tokyo Electric Co. Ltd. Printing head of dot printer
EP0220959A2 (en) * 1985-10-29 1987-05-06 Nec Corporation Ceramic electronic device and method of manufacturing the same
DE3540761A1 (de) * 1985-11-16 1987-05-21 Mannesmann Ag Matrixdruckkopf
EP0238926A1 (fr) * 1986-03-27 1987-09-30 Comadur SA Tête d'impression pour imprimante par matrice de points

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1270859B (de) * 1965-09-03 1968-06-20 Arthur Klemt Vorrichtung zur Betaetigung der Nadeln eines Nadeldruckwerks
US4098388A (en) * 1976-11-04 1978-07-04 Fabrique d'Horlogerie CHS, Tissot & Fils. S.A. Printing wire for use in a matrix printer and method for making same
US4143979A (en) * 1977-05-04 1979-03-13 Texas Instruments Incorporated Printhead needle cap
US4176975A (en) * 1977-12-05 1979-12-04 International Business Machines Corporation Metalloid filament wire matrix print head
US4256948A (en) * 1978-12-15 1981-03-17 Dataproducts Corporation Integral beaded stylus wire and method of making same
JPS5957765A (ja) * 1982-09-28 1984-04-03 Citizen Watch Co Ltd 印字ヘツドの製造方法
JPH0611790Y2 (ja) * 1987-08-28 1994-03-30 沖電気工業株式会社 ドット印字ヘッド

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4230412A (en) * 1978-03-17 1980-10-28 Helmut Falk Matrix print head assembly
EP0067542A1 (en) * 1981-06-04 1982-12-22 Tokyo Electric Co. Ltd. Printing head of dot printer
EP0220959A2 (en) * 1985-10-29 1987-05-06 Nec Corporation Ceramic electronic device and method of manufacturing the same
DE3540761A1 (de) * 1985-11-16 1987-05-21 Mannesmann Ag Matrixdruckkopf
EP0238926A1 (fr) * 1986-03-27 1987-09-30 Comadur SA Tête d'impression pour imprimante par matrice de points

Also Published As

Publication number Publication date
DE4020015C1 (enrdf_load_stackoverflow) 1991-09-26
US5137381A (en) 1992-08-11
JPH04232759A (ja) 1992-08-21

Similar Documents

Publication Publication Date Title
DE3017903C2 (de) Druckkopf
EP0357860B1 (de) Matrixnadeldruckkopf der Klappankerbauart
DE2456816B2 (de) Druckkopf fuer drahtdrucker
DE3031855A1 (de) Druckkopf.
DE2244475A1 (de) Edelsteinlager fuer druckerkoepfe und dergleichen
DE3784446T2 (de) Druckkopf für einen Matrix-Nadeldrucker.
DE2629267A1 (de) Antriebsvorrichtung fuer einen draht-matrixdrucker
DE2810145A1 (de) Druckkopflager fuer einen matrixdrucker und druckkopf mit einem derartigen lager
EP0466286A1 (de) Matrixnadeldruckkopf
EP0157727B1 (de) Matrixdruckkopf
DE2621282A1 (de) Auswechselbare zusammengesetzte druckdrahtfuehrung
DE2216967C3 (de) Schreibkopf für zusammengesetzte Schrift- oder Kodezeichen
DE69018148T2 (de) Nadeldruckkopf für Drucker mit hoher Auflösung.
DE1611431C3 (de) Drahtdruckkopf
DE2848639A1 (de) Druckkopf fuer drahtdrucker
EP0338176B1 (de) Matrixnadeldruckkopf
DE3412854C2 (enrdf_load_stackoverflow)
DE69309256T2 (de) Punktnadeldruckkopf
DE69111288T2 (de) Matrixdruckkopf.
DE69106641T2 (de) Punktnadeldruckkopf und Verfahren zu seiner Herstellung.
DE2145116C3 (de) Schreibkopf für zusammengesetzte Schrift- oder Codezeichen
DE68911278T2 (de) Punktmatrixdrucker mit Anschlagdruckkopf.
DE3531885A1 (de) Druckwerkskopf fuer einen punkt-linien-drucker
EP0163592B1 (de) Matrixdruckkopf mit verstellbarer Drucknadelführung
DE2150402C3 (de) Mosaikdrucker

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR GB IT LI NL

17P Request for examination filed

Effective date: 19911227

17Q First examination report despatched

Effective date: 19931006

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 19940401