EP0314851A1 - Imprimante à matrice d'aiguilles ayant un guidage réglable des aiguilles d'impression - Google Patents

Imprimante à matrice d'aiguilles ayant un guidage réglable des aiguilles d'impression Download PDF

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Publication number
EP0314851A1
EP0314851A1 EP87730139A EP87730139A EP0314851A1 EP 0314851 A1 EP0314851 A1 EP 0314851A1 EP 87730139 A EP87730139 A EP 87730139A EP 87730139 A EP87730139 A EP 87730139A EP 0314851 A1 EP0314851 A1 EP 0314851A1
Authority
EP
European Patent Office
Prior art keywords
needle
needle guide
print
printing
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.)
Granted
Application number
EP87730139A
Other languages
German (de)
English (en)
Other versions
EP0314851B1 (fr
Inventor
Clemens Dipl.-Ing.(Fh) Kaufmann
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 EP87730139A priority Critical patent/EP0314851B1/fr
Priority to AT87730139T priority patent/ATE72545T1/de
Priority to DE8787730139T priority patent/DE3776698D1/de
Priority to US07/262,889 priority patent/US4900167A/en
Priority to JP63279211A priority patent/JPH01154764A/ja
Publication of EP0314851A1 publication Critical patent/EP0314851A1/fr
Application granted granted Critical
Publication of EP0314851B1 publication Critical patent/EP0314851B1/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
    • 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
    • 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 an adjustable pressure needle guide, a pressure needle drive assembly and a pressure needle guide assembly facing a pressure abutment are provided with a housing guiding the pressure needles, and in the area of the pressure needle guide assembly an electric lifting magnet with an adjusting screw for the magnetic core, which together with a needle guide carrier and forms an adjustable working air the needle guide carrier can be moved back and forth between two fixed positions.
  • the print needle guide is adjusted by less than a needle spacing (approx. 0.3 mm), whereby the needle spacing gaps are filled by further pressure points.
  • the adjustment of the pressure needle guide therefore requires a very high level of accuracy between two fixed positions (stops), the pressure needles being guided in a needle guide block which is made of a similar material as jewels for small watches.
  • the pressure needle guide and this needle guide block are located on a relatively long lever arm, which is usually pivoted about a joint in the area of the pressure needle drive assembly.
  • the Movement of the needle guide block on an arc with a radius equal to the length of the lever arm is disadvantageous because the bow height of the bow is noticeable in a certain adjustment range.
  • this disadvantage has so far been considered acceptable.
  • such adjustable print needle guides have proven themselves in thousands of matrix needle print heads.
  • Shorter needles mean a shorter housing for the needle guide assembly. However, this connects a shorter lever arm to which the needle guide carrier is attached. The shorter lever arm means a reduction in the radius, i.e. a greater curvature of the arch on which the needle guide block can be moved back and forth. At the same time, however, it must be taken into account that shorter needles are stiffer than longer ones and are therefore more difficult to bend, which in turn means that a greater drive force must be applied by the needle drive assembly due to increased friction in the guide levels.
  • the invention has for its object to provide a matrix needle printhead with an adjustable needle guide, which is suitable for shorter, more rigid bending needles.
  • the object is achieved according to the invention with the matrix needle printhead mentioned at the outset in that the electric lifting magnet is arranged with its coil center axis perpendicular to the center axis of the matrix needle printhead running in the printing direction of the printing needles, and in that in a guide movable magnetic core is connected to a parallel adjustable needle guide carrier.
  • This solution first eliminates the disadvantageous consequences of the swiveling movement of the needle guide block, which can only be moved perpendicular to the central axis of the matrix print head, with short as well as long print needles. Then, by attaching the needle guide carrier to the magnetic core, the needle guide carrier is removed from the magnetic flux circuit of the electric lifting magnet, whereby the magnetic flux circuit becomes shorter and better energy utilization takes place.
  • the separation of the needle guide carrier from the magnetic flux circuit means that it no longer has to be made from heavy iron materials, but from light materials, so that weight can be saved for this moving part.
  • the guiding of the movable magnetic core can be particularly advantageous because simple, can be realized in that the electric lifting magnet has a core socket in which the magnetic core connected to the needle guide carrier is guided.
  • An additional improvement of the magnetic flux conditions occurs in that a threaded nut is arranged on the side of the core bushing facing away from the central axis, in which such an adjusting screw is provided, which forms the adjustable working air gap with the magnetic core within the electric lifting magnet.
  • This solution means a lower leakage flux of the electromagnet and therefore a higher attraction force in the area of the air gap. Since the adjusting screw has been integrated into the magnetic flux circuit as a part guiding the magnetic flux, a separate adjusting screw has been omitted in comparison with the previous one.
  • the two permanently adjustable positions of the needle guide carrier are advantageously ensured by the fact that between the needle guide carrier and that on the housing of the pressure needle guide assembly fixed electric lifting magnet a curved flat spring is arranged.
  • the design of the adjustable pressure needle guide is further improved in that the needle guide carrier forms an essentially angular component, on the first leg of which the magnetic core and on the second leg of the needle guide block are attached.
  • the exposed parallel guide of the needle guide carrier is also formed without great effort in that the angular component with the second leg, to which the needle guide block is attached, is mounted laterally in a guide which forms the housing of the pressure needle guide assembly.
  • the matrix needle printhead 1 is equipped with an adjustable needle guide 2. It has a basic structure, which includes a printing needle drive assembly 3 (only indicated) and a printing needle guide assembly 5 facing a pressure abutment 4 for a printing needle 7 forming a column 6.
  • the printing needles 7, e.g. form a column 6 of nine or twelve printing needles 7 are guided in a housing 8.
  • An electric lifting magnet 9 is arranged in the area of the printing needle guide assembly 5 for the adjustable printing needle guide 2.
  • the pressure needle guide assembly 5 is screwed onto a plate 3a of the pressure needle drive assembly 3 with the interposition of adjusting plates 10 by means of screws 11.
  • the electric lifting magnet 9 has an adjusting screw 12, by means of which the magnetic core 13 can be set to a favorable working air gap 14 or readjusted after assembly.
  • the pressure needle guide 2 is attached to a needle guide carrier 15 to be described in more detail. This pressure needle guide 2 is moved back and forth by the electric lifting magnet 9 between two fixed positions.
  • the electric lifting magnet 9 is arranged with its central coil axis 16 perpendicular to the central axis 17 of the matrix needle print head 1, the printing needles 7 printing essentially in the direction of this central axis 17 or parallel to the central axis 17.
  • the guided magnetic core 13 adjusts the needle guide carrier 15 with the printing needle guide 2 parallel in the direction of the coil center axis 16 in such a way that the printing needle guide 2 is adjusted perpendicularly and not in an arc shape to the central axis 17.
  • the electric lifting magnet 9 has a core bushing 18 in which the magnetic core 13 connected to the needle guide carrier 15 is slidably guided.
  • a threaded nut 19 is arranged on the electric lifting magnet 9, in which such an adjusting screw 12 is provided, which forms the working air gap 14 with the magnetic core 13 approximately in the middle of the height of the electric lifting magnet 9.
  • the excitation coil 22 has an extremely small diameter (maximum 12 mm).
  • the needle guide carrier 15 is held by means of a curved flat spring 23, which bears against the frame 24 for the excitation coil 22, at the distance which corresponds to the working air gap 14 or the displacement distance for the pressure needle guide 2.
  • the needle guide carrier 15 forms an essentially angular component with a first leg 15a, to which the magnetic core 13 is fastened by means of a rivet connection 25 and a second leg 15b, in which a needle guide block 26 is fastened.
  • This second leg 15b is mounted on the housing 8 of the pressure needle guide assembly 5 in a laterally formed guide 27 and 28, respectively. Between the guides 27 and 28, the second leg 15b can be moved up and down in the dimension of the working air gap 14, depending on how the adjusting screw 12 is set.

Landscapes

  • Impact Printers (AREA)
  • Common Mechanisms (AREA)
EP87730139A 1987-11-06 1987-11-06 Imprimante à matrice d'aiguilles ayant un guidage réglable des aiguilles d'impression Expired - Lifetime EP0314851B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP87730139A EP0314851B1 (fr) 1987-11-06 1987-11-06 Imprimante à matrice d'aiguilles ayant un guidage réglable des aiguilles d'impression
AT87730139T ATE72545T1 (de) 1987-11-06 1987-11-06 Matrixnadeldrucker mit verstellbarer drucknadelfuehrung.
DE8787730139T DE3776698D1 (de) 1987-11-06 1987-11-06 Matrixnadeldrucker mit verstellbarer drucknadelfuehrung.
US07/262,889 US4900167A (en) 1987-11-06 1988-10-25 Matrix pin printer with adjustable print pin guide
JP63279211A JPH01154764A (ja) 1987-11-06 1988-11-04 調整可能な印字ニードル案内部材を備えているマトリクスニードル印字ヘッド

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87730139A EP0314851B1 (fr) 1987-11-06 1987-11-06 Imprimante à matrice d'aiguilles ayant un guidage réglable des aiguilles d'impression

Publications (2)

Publication Number Publication Date
EP0314851A1 true EP0314851A1 (fr) 1989-05-10
EP0314851B1 EP0314851B1 (fr) 1992-02-12

Family

ID=8198373

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87730139A Expired - Lifetime EP0314851B1 (fr) 1987-11-06 1987-11-06 Imprimante à matrice d'aiguilles ayant un guidage réglable des aiguilles d'impression

Country Status (5)

Country Link
US (1) US4900167A (fr)
EP (1) EP0314851B1 (fr)
JP (1) JPH01154764A (fr)
AT (1) ATE72545T1 (fr)
DE (1) DE3776698D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9062570B2 (en) 2010-06-25 2015-06-23 Pierburg Gmbh Infinitely variable pressure-control valve

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2526233A1 (de) * 1974-07-09 1976-01-29 Zentronik Veb K Mosaikdruckeinrichtung
DE3412854A1 (de) * 1984-02-01 1985-10-03 Mannesmann AG, 4000 Düsseldorf Matrixdruckkopf mit verstellbarer drucknadelfuehrung
DE3412856A1 (de) * 1984-04-03 1985-10-03 Mannesmann AG, 4000 Düsseldorf Matrixdruckkopf mit verstellbarer drucknadelfuehrung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE224815C (fr) *
US3882985A (en) * 1973-07-23 1975-05-13 Ncr Co Tiltable matrix print head to permit viewing of the characters
US4284363A (en) * 1979-07-30 1981-08-18 International Business Machines Corp. Data matrix print head
US4459051A (en) * 1979-08-15 1984-07-10 Canon Kabushiki Kaisha Matrix printer
US4640633A (en) * 1984-03-22 1987-02-03 Dh Technology, Inc. High-speed wire print head with wire print position shift apparatus
US4605323A (en) * 1985-07-02 1986-08-12 At&T Teletype Corporation Dual quality wire matrix print head

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2526233A1 (de) * 1974-07-09 1976-01-29 Zentronik Veb K Mosaikdruckeinrichtung
DE3412854A1 (de) * 1984-02-01 1985-10-03 Mannesmann AG, 4000 Düsseldorf Matrixdruckkopf mit verstellbarer drucknadelfuehrung
DE3412856A1 (de) * 1984-04-03 1985-10-03 Mannesmann AG, 4000 Düsseldorf Matrixdruckkopf mit verstellbarer drucknadelfuehrung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9062570B2 (en) 2010-06-25 2015-06-23 Pierburg Gmbh Infinitely variable pressure-control valve

Also Published As

Publication number Publication date
DE3776698D1 (de) 1992-03-26
JPH01154764A (ja) 1989-06-16
ATE72545T1 (de) 1992-02-15
US4900167A (en) 1990-02-13
EP0314851B1 (fr) 1992-02-12

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