EP0157725B1 - Matrixdruckkopf mit verstellbarer Drucknadelführung - Google Patents

Matrixdruckkopf mit verstellbarer Drucknadelführung Download PDF

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Publication number
EP0157725B1
EP0157725B1 EP85730020A EP85730020A EP0157725B1 EP 0157725 B1 EP0157725 B1 EP 0157725B1 EP 85730020 A EP85730020 A EP 85730020A EP 85730020 A EP85730020 A EP 85730020A EP 0157725 B1 EP0157725 B1 EP 0157725B1
Authority
EP
European Patent Office
Prior art keywords
print head
guide
print
matrix
guide support
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
EP85730020A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0157725A2 (de
EP0157725A3 (en
Inventor
Harald Dipl.-Ing. Niebel
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 AT85730020T priority Critical patent/ATE54879T1/de
Publication of EP0157725A2 publication Critical patent/EP0157725A2/de
Publication of EP0157725A3 publication Critical patent/EP0157725A3/de
Application granted granted Critical
Publication of EP0157725B1 publication Critical patent/EP0157725B1/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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface
    • 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

Definitions

  • the invention relates to a matrix printhead with an adjustable pressure needle guide, furthermore having a pressure needle drive assembly arranged on the side facing away from the pressure abutment and a pressure needle adjustment assembly facing the pressure abutment, which has an electromagnetically drivable guide mouthpiece for the pressure needles attached to a flexible guide carrier running parallel to the pressure needles
  • Guide carrier consists of a rigid rod which is pivotally mounted in the area or pressure needle drive assembly by means of a play-free joint and is held in its rest position by spring force or is returned to it.
  • Such adjustable guide mouthpieces serve to position one in the printing position in relation to one in steps of the continuously moving recording medium, e.g. a perforated paper web, the matrix print head is not to be adjusted with its full mass, but rather as closely as possible with the mass of the guide mouthpiece.
  • the adjustment of one or more pressure needle gaps e.g. consist of five to nine printing needles arranged one above the other, is used to generate fine writing or quick writing, with the fine writing one or more printing needle gaps being adjusted in the direction of the printing needle gaps.
  • JP-A-56 27 363 It is also known (JP-A-56 27 363) to design a matrix print head with an adjustable print needle guide in such a way that the electromagnet required for the adjustment is attached to the print head, so that the end face of the magnetic yoke surrounded by the electromagnetic coil is parallel to the print needles runs opposite guide beam and forms an adjusting air gap with this.
  • an exact adjustment for the guide mouthpiece is not possible due to a large number of manufacturing tolerances, nor can adjustment air gaps of the same size be achieved in production, moreover the matrix print head is relatively high and it is not possible to expand the system to two guide mouthpieces at all.
  • JP-A-56-44 676 Another known solution (JP-A-56-44 676) has an electromagnet mounted on the print head carriage for adjusting the guide carrier, an adjusting screw and a fixing screw being provided for adjusting the air gap.
  • This solution is even more difficult to get to grips in terms of accuracy, because the matrix printhead is stored separately on the printhead carriage and the electromagnet adjustment assembly must also be separately attached to the printhead carriage perpendicular to the running of the printing needles. The attachment points outside the matrix print head alone are problematic.
  • Another particular problem is the end positions of the guide mouthpiece, which have to be adhered to very precisely because of the printing accuracy desired for fine writing.
  • the invention is therefore based on the object, a precise adjustment for the guide mouthpiece with easy to control manufacturing tolerances, with a flat design in the area of the guide mouthpiece, with easy assembly, further for the possibility of conversion from one to several guide mouthpieces and for a safe setting of the end positions to accomplish.
  • the object is achieved in that a horizontally transverse to the guide carrier rests on the guide carrier by means of supporting projections, and in an armature bridge supported in a play-free pivot bearing, an electromagnet is attached next to the guide carrier in the interior of the printhead housing, the anchor bridge being associated with the guide carrier when the Electromagnet moved from its rest position.
  • the play-free joint and the play-free swivel bearing ensure extremely precise adjustment of the guide mouthpiece.
  • the anchor bridge allows a space-utilizing arrangement of the electromagnet without requiring a high construction in the area of the guide mouthpiece.
  • the division into a guide beam and an anchor bridge ensure easy assembly and economical production of the matrix printhead.
  • the support of the anchor bridge also ensures compliance with the end positions with great accuracy.
  • the play-free joint consists of a leaf spring which is rigidly fixed on the one hand to the body of the guide carrier and on the other hand rigidly attached to the printhead housing in the area of the pressure needle drive assembly.
  • the body of the guide carrier itself can be rigid and does not form a spring.
  • the cutting edge bearing consists of one in the print head round rod and a corresponding trough is formed in the anchor bridge. This design ensures economical production of the parts with a favorable choice of tolerance.
  • the assembly is additionally facilitated by the fact that the round rod of the cutting edge bearing is fastened in a removable cover of the printhead housing.
  • the armature bridge is underpinned by means of arms of a holder which run symmetrically to the cutting edge bearing.
  • Compliance with the adjustment of the guide mouthpiece or the guide mouthpieces for the pressure needle gaps or pressure needle gaps to be carried out between the pressure passports can be designed particularly advantageously in this case by providing the support projections on the anchor bridge at a fixed distance ratio from the cutting edge bearing. This idea encompasses a wide range of application of the individual adjustment stages, whereby it is made possible to achieve other adjustment distances for quick and fine writing simply by exchanging the anchor bridge.
  • a selection of different anchor bridges can therefore represent a wide range of different fonts or font qualities.
  • a space-saving arrangement i.e. A flat construction is also achieved with more than one guide carrier, in that the electromagnets are arranged laterally to the guide carriers in the case of two guide carriers running in parallel.
  • electromagnet is provided so that it can be adjusted from the outside on the matrix print head housing with respect to the working air gap.
  • the matrix printhead with an adjustable print needle guide lies as a whole opposite the pressure abutment 1 when the matrix printer is in operation.
  • the pressure abutment 1 generally consists of a cylindrical platen.
  • the pressure needle drive group 2 lies on the side facing away from the pressure abutment 1.
  • the structure of this pressure needle drive assembly 2 can be designed independently of the pressure needle adjustment assembly 3 or in the usual way. The structure is therefore not described. It is only important that the push pin drive assembly 2 e.g. is equipped for nine or two times nine printing needles 4.
  • the pressure needle adjusting assembly 3 has an electromagnetically drivable, vertically up and down adjustable guide mouthpiece 5, which is attached to an adjusting member 6.
  • the adjusting member 6 is essentially formed from the guide bracket 7 (a rigid rod) and a rear play-free joint 8.
  • the joint is free of play because it consists of a leaf spring 9 which is connected to the body 7a of the guide support 7 e.g. is connected by spot welding and is rigidly fastened by means of the screw 10 to a bearing 11a of the printhead housing 11, the leaf spring 9 bridging a gap 12 between the body 7a and the bearing 11a. This gap 12 is functionally part of the play-free joint 8.
  • the control element for the adjustment movement is the armature bridge 13, which rests in an equally play-free pivot bearing 14.
  • the electromagnet 15 is arranged below and to the side of the armature bridge 13 (FIGS. 2 and 4).
  • the armature bridge 13 projects above the magnetic core 15a, the working air gap being designated 16a.
  • the cutting edge bearing 17 can be implemented in several configurations, a game having to be avoided.
  • a backlash-free pivot bearing 14 or a knife-free cutting bearing 17 is formed by a round rod 21 fixed in the printhead housing 11 or an attached cover 11c in bearing heads 20a and 20b and the corresponding trough 22 of the anchor bridge 13.
  • the play-free pivot bearing 14 or the chip-free cutting bearing 17 is achieved when the cover 11c is installed and by tightening the screw 23, as a result of which the cover 11c is fixed in position on an edge surface 11 of the print head housing 11.
  • the armature breaks 13 through their trough 22 and the round rod 21 via the support projections 18 and 19 are actually in the operating position for the guide support 7, due to the leaf spring 9 there is no play in one of the two end positions.
  • the second end position is achieved by the electromagnet 15, the working air gap 16a being additionally adjustable.
  • This second adjustment possibility results from the adjustable electromagnet 15, which is attached to the outer section of the U-shaped magnetic core 15a by means of an adjusting screw 24.
  • the adjusting screw 24 is in front of a long groove 25 seen so that the electromagnet 15 can be adjusted from the bottom partially open side 2a of the pressure needle drive assembly 2.
  • two guide supports 7 are provided, which run parallel to one another, separated by a gap.
  • the anchor bridge 13 is gripped by means of the arms 26a and 26b of a holder 26, the holder 26 being fastened to the inside of the cover 11c by means of a leaf spring 27.
  • the support projections 18, 19 of the anchor bridge 13 are in the defined spacing ratio A: B (FIG. 2), which is assumed to be 1: 3 there as shown, but for any interchangeable anchor bridges 13, which is for quick writing or fine writing is reasonable, can assume that such anchor bridges can be stored with different distances between the support projections 18 and 19.
  • the electromagnets 15 are arranged for two guide supports 7 (FIGS. 3 and 4) laterally next to the guide supports 7 (in particular FIG. 4) and are perpendicular to their axis of action.

Landscapes

  • Impact Printers (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Coating With Molten Metal (AREA)
EP85730020A 1984-04-03 1985-02-06 Matrixdruckkopf mit verstellbarer Drucknadelführung Expired - Lifetime EP0157725B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85730020T ATE54879T1 (de) 1984-04-03 1985-02-06 Matrixdruckkopf mit verstellbarer drucknadelfuehrung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3412856 1984-04-03
DE19843412856 DE3412856A1 (de) 1984-04-03 1984-04-03 Matrixdruckkopf mit verstellbarer drucknadelfuehrung

Publications (3)

Publication Number Publication Date
EP0157725A2 EP0157725A2 (de) 1985-10-09
EP0157725A3 EP0157725A3 (en) 1986-12-03
EP0157725B1 true EP0157725B1 (de) 1990-07-25

Family

ID=6232784

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85730020A Expired - Lifetime EP0157725B1 (de) 1984-04-03 1985-02-06 Matrixdruckkopf mit verstellbarer Drucknadelführung

Country Status (5)

Country Link
US (1) US4629344A (ja)
EP (1) EP0157725B1 (ja)
JP (1) JPS60217167A (ja)
AT (1) ATE54879T1 (ja)
DE (2) DE3412856A1 (ja)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH667618A5 (fr) * 1986-03-21 1988-10-31 Hermes Precisa International Tete d'ecriture commutable.
ATE72545T1 (de) * 1987-11-06 1992-02-15 Mannesmann Ag Matrixnadeldrucker mit verstellbarer drucknadelfuehrung.
DE4020010A1 (de) * 1990-06-21 1992-01-09 Mannesmann Ag Matrixnadeldruckkopf
IT1247770B (it) * 1990-10-31 1994-12-30 Microlys Spa Testa di stampa a matrice di punti per stampa ad alta definizione o ad alta velocita'

Family Cites Families (10)

* 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
US4010835A (en) * 1975-08-01 1977-03-08 International Business Machines Corporation Matrix print head
DE2535699C3 (de) * 1975-08-09 1978-12-14 Olympia Werke Ag, 2940 Wilhelmshaven Verfahren und Drucker zur Herstellung von feingerasterten Schriftzeichen auf einem Aufzeichnungsträger
JPS5627363A (en) * 1979-08-15 1981-03-17 Canon Inc Wire dot printing head
US4459051A (en) * 1979-08-15 1984-07-10 Canon Kabushiki Kaisha Matrix printer
JPS5644676A (en) * 1979-09-20 1981-04-23 Canon Inc Wire matrix printer
JPS5662165A (en) * 1979-10-29 1981-05-27 Seikosha Co Ltd Serial dot printer
DE3022128C2 (de) * 1980-06-10 1983-12-08 Mannesmann AG, 4000 Düsseldorf Druckkopf zum Erzeugen von Druckzeichen nach dem Matrix-Druckverfahren
DE3041877A1 (de) * 1980-11-06 1982-05-13 Mannesmann AG, 4000 Düsseldorf Matrixdrucker und zugehoeriger nadeldruckkopf
DE3243475A1 (de) * 1982-11-22 1984-05-24 Mannesmann AG, 4000 Düsseldorf Nadeldruckkopf fuer matrixdrucker

Also Published As

Publication number Publication date
EP0157725A2 (de) 1985-10-09
US4629344A (en) 1986-12-16
JPH0442991B2 (ja) 1992-07-15
DE3412856C2 (ja) 1987-09-03
JPS60217167A (ja) 1985-10-30
ATE54879T1 (de) 1990-08-15
EP0157725A3 (en) 1986-12-03
DE3412856A1 (de) 1985-10-03
DE3578805D1 (de) 1990-08-30

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