EP0462684B1 - Matrixnadeldruckkopf - Google Patents

Matrixnadeldruckkopf Download PDF

Info

Publication number
EP0462684B1
EP0462684B1 EP91250115A EP91250115A EP0462684B1 EP 0462684 B1 EP0462684 B1 EP 0462684B1 EP 91250115 A EP91250115 A EP 91250115A EP 91250115 A EP91250115 A EP 91250115A EP 0462684 B1 EP0462684 B1 EP 0462684B1
Authority
EP
European Patent Office
Prior art keywords
mouthpiece
print head
guide
matrix print
head according
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
EP91250115A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0462684A1 (de
Inventor
Johann Stempfle
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 EP0462684A1 publication Critical patent/EP0462684A1/de
Application granted granted Critical
Publication of EP0462684B1 publication Critical patent/EP0462684B1/de
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
    • B41J2/25—Print wires
    • B41J2/255—Arrangement of the print ends of the wires
    • 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
    • B41J2/265—Guides for print wires

Definitions

  • the invention relates to a matrix needle printhead with a plurality of printing needles, the rear end of which is assigned an electromagnetic drive for longitudinal movements of the printing needles in order to generate printing points on a recording medium, and the front ends of which are each columns or rows in a reciprocating or moving up and down Form guide mouthpiece, wherein a lifting magnet device is provided for two defined end positions of a magnet armature.
  • Matrix dot print heads of this type are used for a higher resolution of pressure dots in a matrix system and thus for writing fine writing in addition to writing quick writing.
  • a printhead provided with two parallel needle gaps is rotated about a central longitudinal axis running approximately parallel to the printing needles, whereby printing needles of the one needle column pressure points between the pressure points of the moving Print the needle gap, whereby the pressure dots are also printed overlapping.
  • the second design is as follows: One of the two needle gaps is relative to the other needle gap, e.g. to half the needle spacing.
  • the present invention relates to the displacement of one needle gap relative to the other, that is to say the second design. It is also possible to print with only one (displaceable) needle gap, but at least two print passes per cell are then required, so that the print head works more slowly.
  • Needle gap adjusting devices based on lifting magnets are known (EP 0 314 851; DE 35 40 761; DE 34 12 856; DE 34 12 854; DE 34 03 795; DE 26 60 934; EP 05 20 66; US 4,640,633).
  • the well-known Solutions take up a relatively large amount of space because they usually use very long lever arms to which the guide mouthpiece is attached.
  • the known large moving masses require correspondingly high switching forces and restoring forces, which are usually generated on the basis of a spring force.
  • the invention is therefore based on the object of proposing such needle gap adjusting devices with a smaller installation space required and with low switching forces.
  • the lifting magnet device is arranged or fastened as a whole in an area directly to the guide mouthpiece and has a magnetic yoke with two or more magnetic poles, an armature body being switched on or off or on between the coordinated distance of two magnetic poles of the same name can be moved back and forth or moved up and down by reversing the polarity of the switched-on solenoid coil, and the guide mouthpiece is fastened to the guided armature body.
  • the advantages of this are a small size of the entire lifting magnet device, so that it can be attached to the left or right of the print head without greatly impairing the user's view of the printed text.
  • the matrix needle printhead according to the invention can, however, be made spatially compact and small in such a way that the lifting magnet device is arranged overall within a matrix print head housing between the foremost pressure needle guide bearing and the guide mouthpiece.
  • the lifting magnet device has an E-shaped yoke, the central yoke leg of which carries the lifting magnet coil. This measure also supports better use of space.
  • the magnetic fluxes are advantageously conducted.
  • Another advantageous embodiment consists in that the armature body of the lifting magnet device is provided with a permanent magnet, wherein the lifting magnet coil can be reversed.
  • the electrical polarity reversal requires very low switching forces, whereby resetting forces due to mechanical springs can be completely dispensed with here.
  • only a slight self-heating of the solenoid takes place in the event of a mere reversal of polarity, so that a high number of switching operations (switching frequency) can be applied.
  • a mouthpiece carrier is articulated to the magnetic yoke.
  • This component also adapts to the magnetic yoke in its outer shape and therefore does not take up any space nor does the transport weight of the matrix needle print head increase significantly.
  • a mouthpiece carrier has at least two parallel arms which are articulated to a rocker and to the magnetic yoke, the rocker being rigidly connected to the anchor body and to the guide mouthpiece.
  • This rocker allows the anchor body with a guide mouthpiece without Move overcoming restoring forces between the magnetic poles of the magnetic yoke of the same name.
  • the mouthpiece support is in one piece, consists of elastic material and the articulation points are formed from so-called film hinges. This solution enables an absolutely bend-free adjustment of the guide mouthpiece in the sense of a parallelogram.
  • the mouthpiece is glued into the mouthpiece carrier. This allows the adjustable needle gap to be aligned with the other printhead parts, e.g. to a second fixed needle gap.
  • a matrix needle print head 1 is perpendicular to the drawing plane in front of one Printing abutment 2 of a matrix printer moves back and forth and generates printing points, characters, graphic representations, images, etc. on a recording medium 4a by means of printing needles 3 via an ink ribbon 4.
  • the matrix needle print head 1 consists essentially of an electromagnetic drive 5 arranged in the rear area, each with an armature 6, each of which drives a pressure needle 3, which is pressed permanently with its rear end 3a by a return spring 7 onto the armature 6.
  • the printing needles 2 are guided in a plurality of printing needle guide bearings 8 and their front ends 3b form vertical columns 3c or oblique rows in a guide mouthpiece 9. At least one of the columns 3c is adjustable in height.
  • the lifting magnet device 10 is arranged overall in close proximity to the guide mouthpiece 9 in order to create particularly short connecting pieces between the magnet armature 11 and guide mouthpiece 9.
  • This immediate area 15 can be located at the top, bottom, left or right of the guide mouthpiece 9 on the matrix print head housing 14 or - as drawn - in an interior 16.
  • the lifting magnet device 10 also has a magnetic yoke 17 which forms magnetic poles 18 and 19.
  • the magnetic poles 18 and 19 are produced by machine at a distance 20 within which they are matched to the movement path of the guide mouthpiece 9 Can move anchor body 21 and thereby moves the guide mouthpiece 9, while a second guide mouthpiece 9a ( Figure 3a) is immovably arranged.
  • the armature body 21 can move back and forth or up and down by switching on or off or by reversing the polarity of a switched-on solenoid 22, the guide mouthpiece 9 being fastened to the armature body 21.
  • the lifting magnet device 10 can be made so small and compact that it can be arranged overall within the interior 16 of the matrix print head housing 14 between the foremost pressure needle guide bearing 8 and the guide mouthpiece 9.
  • One of the special structural features of the lifting magnet device 10 is an E-shaped yoke 23, the central yoke leg 24 of which carries the lifting magnet coil 22.
  • the anchor body 21 can consist of a one-piece piece of soft iron. However, it can also be structured, with a permanent magnet 25 being provided as the central part (FIG. 3a). If the permanent magnet 25 is used, the solenoid 22 is to be switched to reverse polarity.
  • a mouthpiece carrier 26 is fastened in an articulated manner to the magnetic yoke 17.
  • the mouthpiece carrier 26 has two parallel arms 26a and 26b and a rocker arm 26c articulated thereto.
  • the arms 26a and 26b are also articulated to the magnetic yoke 17 and the rocker 26c is immovably connected to the armature body 21 and to the guide mouthpiece 9, respectively.
  • the mouthpiece support 26 is made in one piece from plastic that can be plasticized and is therefore elastic enough to make articulation points 27 to form so-called film hinges 27c.
  • the guide mouthpiece 9 is glued into the mouthpiece carrier 26 by means of adhesives 28, so that (FIGS. 3a and 3b) an alignment can take place between the first guide mouthpiece 9 and the second guide mouthpiece 9a.
  • a mechanical spring (not shown) is advantageously to be provided for the return to the defined end position.

Landscapes

  • Impact Printers (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Facsimile Scanning Arrangements (AREA)
EP91250115A 1990-06-21 1991-04-25 Matrixnadeldruckkopf Expired - Lifetime EP0462684B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4020010 1990-06-21
DE4020010A DE4020010A1 (de) 1990-06-21 1990-06-21 Matrixnadeldruckkopf

Publications (2)

Publication Number Publication Date
EP0462684A1 EP0462684A1 (de) 1991-12-27
EP0462684B1 true EP0462684B1 (de) 1994-06-15

Family

ID=6408916

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91250115A Expired - Lifetime EP0462684B1 (de) 1990-06-21 1991-04-25 Matrixnadeldruckkopf

Country Status (5)

Country Link
US (1) US5215390A (th)
EP (1) EP0462684B1 (th)
JP (1) JPH04232758A (th)
AT (1) ATE107232T1 (th)
DE (2) DE4020010A1 (th)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5793392A (en) * 1995-06-13 1998-08-11 Tschida; Mark J. Printing apparatus and method
US8459889B2 (en) 2010-06-11 2013-06-11 International Business Machines Corporation Multi-dimensional print cutting head
CN110696494B (zh) * 2019-10-29 2020-11-27 嘉兴市新中软计算机系统工程有限公司 一种针式打印机打印头

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3882985A (en) * 1973-07-23 1975-05-13 Ncr Co Tiltable matrix print head to permit viewing of the characters
DE3041877A1 (de) * 1980-11-06 1982-05-13 Mannesmann AG, 4000 Düsseldorf Matrixdrucker und zugehoeriger nadeldruckkopf
DE3403795C2 (de) * 1984-02-01 1986-12-18 Mannesmann AG, 4000 Düsseldorf Matrixnadeldruckkopf mit einem in Spaltenrichtung verstellbaren Mundstück
US4640633A (en) * 1984-03-22 1987-02-03 Dh Technology, Inc. High-speed wire print head with wire print position shift apparatus
DE3412856A1 (de) * 1984-04-03 1985-10-03 Mannesmann AG, 4000 Düsseldorf Matrixdruckkopf mit verstellbarer drucknadelfuehrung
US4605323A (en) * 1985-07-02 1986-08-12 At&T Teletype Corporation Dual quality wire matrix print head
CH667618A5 (fr) * 1986-03-21 1988-10-31 Hermes Precisa International Tete d'ecriture commutable.

Also Published As

Publication number Publication date
US5215390A (en) 1993-06-01
DE4020010C2 (th) 1992-04-16
DE4020010A1 (de) 1992-01-09
EP0462684A1 (de) 1991-12-27
ATE107232T1 (de) 1994-07-15
JPH04232758A (ja) 1992-08-21
DE59101921D1 (de) 1994-07-21

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