EP0026549A2 - Tête d'impression à aiguilles - Google Patents

Tête d'impression à aiguilles Download PDF

Info

Publication number
EP0026549A2
EP0026549A2 EP80200915A EP80200915A EP0026549A2 EP 0026549 A2 EP0026549 A2 EP 0026549A2 EP 80200915 A EP80200915 A EP 80200915A EP 80200915 A EP80200915 A EP 80200915A EP 0026549 A2 EP0026549 A2 EP 0026549A2
Authority
EP
European Patent Office
Prior art keywords
electromagnets
cradle
supports
carrier
conical
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
EP80200915A
Other languages
German (de)
English (en)
Other versions
EP0026549A3 (en
EP0026549B1 (fr
Inventor
Wendelin Weber
Burkhard Goerke
Peter Engler
Heinrich Dürr
Hermann Richter
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0026549A2 publication Critical patent/EP0026549A2/fr
Publication of EP0026549A3 publication Critical patent/EP0026549A3/de
Application granted granted Critical
Publication of EP0026549B1 publication Critical patent/EP0026549B1/fr
Expired 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
    • B41J2/27—Actuators for print wires
    • B41J2/285—Actuators for print wires of plunger type
    • 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

Definitions

  • the invention relates to a wire print head with cylindrical electromagnets arranged in a circle around a central axis and actuating the printing needles, which are mounted in cradle-shaped supports of a conical carrier.
  • Such a needle printhead is known from the magazine “Electronics", March 1977, page 54.
  • the electromagnets required to control the pressure elements are mounted in a metal support with cradle-shaped supports.
  • the electromagnets in this support are secured by the heads of screws which are screwed into the metal carrier between the neighboring electromagnets.
  • the invention has for its object a needle
  • the electromagnets can be arranged close to each other on the carrier and in which the vibrations and temperature fluctuations are insignificant for proper storage and securing of the electromagnets.
  • the supports are designed to be elastic, that the electromagnets are mounted under spring force in the cradle-shaped supports by clamping devices which are common to all electromagnets and hold them against the conical support, and in that each electromagnet prevents displacement in its Longitudinal direction is secured by two approaches, at least one of which is resilient.
  • the electromagnets of the needle printhead according to the invention are clamped between two approaches, at least one of which is elastic, and are additionally mounted on flexible supports, the vibrations and expansions which occur as a result of temperature fluctuations can be absorbed by the clamping force. Loosening of the electromagnets in their bearings or damage to the needle print head is avoided.
  • the electromagnets rest on a relatively large part of the supports.
  • the conical support has an undercut in the area of the electromagnet, which extends in the longitudinal direction of the support, the support can be made of relatively hard plastic without the elasticity of the cradle-shaped supports being impaired.
  • the position of the electromagnets can be adapted to the respective position of the envelope surface of the associated recesses by the cradle-shaped supports, which are flexible in all coordinates.
  • the electromagnet itself is compliant in all its coordinates, so that the contact area between the cylinder of the electromagnet and the clamping device is as large as possible. Good heat dissipation via the clamping device is also achieved as a result.
  • the conical carrier made of plastic for example made of a thermoplastic, is expediently reinforced by glass fibers.
  • glass fibers for example, Polyamide 6/6 with, for example, 30% glass fiber.
  • Polycarbonate is also suitable.
  • the approaches for clamping the electromagnets in the axial direction can be parts of the conical carrier.
  • the lugs, which are arranged near the cone tip of the conical carrier as a star-shaped metal spring which is connected to the holder, for example by screws or clamps, or is also embedded in the holder.
  • the front part 1 consists essentially of a front part 1, in which the guides for the printing needles 4 are located, and a rear part 2, in which the cylindrical electromagnets 5 for controlling the printing needles are arranged.
  • the electromagnets 5 are designed as plunger armature magnets, with the armature of which the printing needles 4 are firmly connected. Both parts 1 and 2 are mounted on the base plate 3 arranged between them.
  • the front part 1 has two bores 6 and 7, with which the needle print head is fixed in a known manner on a carriage, not shown.
  • the rear part 2 contains at least one conical carrier 8 on which the electromagnets 5 are arranged in a circle.
  • the conical support 8 is made of plastic, which is reinforced with glass fibers. Any plastic that can withstand higher temperatures without impairment is suitable.
  • the conical carrier 8 itself consists of a the central axis arranged central part 27, at one end of which the base part 28 connects.
  • This base part 28 has an axially aligned central approach, which is preferred so far that an undercut 30 is formed, and which carries the bearing parts 9 for the electromagnets 5 at its front ends.
  • the bearing parts are chamfered so that the support lines of the supports 24 and 25 for the electromagnets coincide with the cone surface lines a.
  • the undercut 30 enables the bearing part 9 and thus the support line to escape radially.
  • the base part 28 has star-shaped lugs 20, which serve as the one lugs for clamping the electromagnets 5.
  • the support 25 is arranged in the base part 28, the surface of which is adapted to the cylindrical shape of the electromagnet, but is held in such a way that a space s exists on all sides between the support 25 and the lateral surface of the electromagnet 5.
  • This gap s is necessary so that the electromagnet 5 can avoid the forces P (FIG. 4) which are exerted on the electromagnet when the clamping device 21, 22 is placed on it.
  • the outer surface of the electromagnet 5 is aligned with the recess 26 so that the outer surface of the electromagnet and the enveloping surface of the recess largely nestle against one another.
  • the electromagnet 5 can deflect in all coordinates due to the forces which occur, wherein it experiences a counterforce P1 only in the region of the supporting line of the resilient bearing part 9.
  • the electromagnets 5 are thereby fixed on the supports 24, 25 of the bearings designed in the manner of a cradle.
  • the number of resilient bearing parts 9 depends on the number of electromagnets 5 to be arranged on the conical carrier 8. In the present example six electromagnets are provided. If more electromagnets than are to be accommodated on the carrier are to be used, ie if the sign to be printed is to be created in the example by more than six printing needles, several conical carriers 8 of the same type can be arranged axially one behind the other. In Fig.1 two and in Fig.2 three carriers are arranged one behind the other. Each carrier 8 is rotated relative to the one in front by a slot division.
  • Each bearing part 9 is axially divided into two partial areas by a slot 11 reaching almost to the central axis 10. This ensures that the bearing part 9 is also formed tangentially resilient. Strong forces exerted centrally on the bearing can thus be absorbed.
  • metal springs 13 are arranged, which are designed in the form of a beam. Each beam of this metal spring 13 projects into the associated area of a bearing part 9. The shape of the metal spring 13 can be seen from Fig.5. After assembly, the slots 14 of the metal spring 13 overlap with the slots 11 of the brackets 8, so that the pressure needles can also be passed through the tension springs without hindrance. These metal springs 13 represent the resilient lugs 29 and 31, which are used to clamp the electromagnets 5.
  • the rear part 2 is assembled by first alternately mounting a carrier 8, then a metal spring 13 and again a carrier 8, etc. on a screw bolt 15 is threaded. Following the last metal spring 13, a spacer 16 is threaded. The screw bolt 15 is then screwed centrally onto the base plate 3 and secured.
  • the conical carrier 8 and the metal spring 13 are secured against rotation by a bolt 17 located on each carrier 8, which protrudes through a hole 18 in the metal spring 13 and engages in a hole (not shown in more detail) in the conical carrier 8 located behind it.
  • the electromagnets 5 with the pressure needles 4 are inserted.
  • the printing needles 4 are inserted into holes 19 of the base plate until the associated electromagnet 5 lies at the level of the associated bearing part 9.
  • the electromagnet 5 is pressed against the lugs 29 and 31 of the metal spring 13, which dodges, so that the electromagnet 5 can now be inserted into the bearing part 9.
  • the electromagnet 5 is then pressed by the force of the metal spring 13 against the fixed star-shaped projection 20 of the bearing part 9 and held on the bearing part 9.
  • the entire rear part 2 including brackets and electromagnets can be closed by two half-shells 21 and 22 of a clamping device, in which the recesses 26 are provided as counter bearings for the electromagnets 5. Only one of these half-shells is shown in FIG. Both half-shells can additionally be provided with cooling fins and have grooves 23 for holding a circuit board (not shown) for the electrical connections.

Landscapes

  • Impact Printers (AREA)
  • Common Mechanisms (AREA)
EP80200915A 1979-10-02 1980-09-29 Tête d'impression à aiguilles Expired EP0026549B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2939885 1979-10-02
DE2939885A DE2939885C2 (de) 1979-10-02 1979-10-02 Nadeldruckkopf

Publications (3)

Publication Number Publication Date
EP0026549A2 true EP0026549A2 (fr) 1981-04-08
EP0026549A3 EP0026549A3 (en) 1982-02-03
EP0026549B1 EP0026549B1 (fr) 1984-06-27

Family

ID=6082468

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80200915A Expired EP0026549B1 (fr) 1979-10-02 1980-09-29 Tête d'impression à aiguilles

Country Status (9)

Country Link
US (1) US4350450A (fr)
EP (1) EP0026549B1 (fr)
JP (1) JPS6045593B2 (fr)
BR (1) BR8006351A (fr)
CA (1) CA1163137A (fr)
DE (2) DE2939885C2 (fr)
FI (1) FI69012C (fr)
IE (1) IE51001B1 (fr)
YU (1) YU250280A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2210331A (en) * 1987-09-30 1989-06-07 Seikosha Kk Printer head for use in a dot impact printer
US5846004A (en) * 1994-11-02 1998-12-08 Newbury Data Recording Limited Impact print head
WO2005075915A1 (fr) * 2004-02-10 2005-08-18 Peter Dawson Serpentin echangeur de chaleur a plaque plate et procede de fonctionnement et de nettoyage associes

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1156203B (it) * 1982-10-12 1987-01-28 Olivetti & Co Spa Testina di stampa a fili di tipo balistico
EP0157624A3 (fr) * 1984-03-30 1987-07-29 Nec Home Electronics, Ltd. Banc de têtes d'impression et méthode de fabrication de celui-ci
US5146849A (en) * 1988-09-07 1992-09-15 Genicom Corporation Print head, mounting therefor and method of mounting

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3897865A (en) * 1973-12-11 1975-08-05 Ibm Dot printing apparatus
US3966035A (en) * 1974-03-01 1976-06-29 Erickson Robert L Printer
DE2702654A1 (de) * 1974-06-25 1978-07-27 Singer Co Drahtmatrixdruckkopf
US4004671A (en) * 1974-12-16 1977-01-25 Lrc, Inc. Wire matrix print head
DE2649213C3 (de) * 1976-10-28 1982-01-21 Siemens AG, 1000 Berlin und 8000 München Anordnung von Magnetsystemen in einem Mosaik-Nadeldruckkopf
IT1072304B (it) * 1976-12-30 1985-04-10 Olivetti & Co Spa Dispositivo di stampa a fili ad alta velocita per macchina contabile terminale telescrivente e simile macchina per ufficio
DE2713886C2 (de) * 1977-03-29 1983-10-27 Siemens AG, 1000 Berlin und 8000 München Vorrichtung zum Führen der Druckernadeln in einem Mosaiknadeldruckwerk
US4218150A (en) * 1978-11-20 1980-08-19 Vydec, Inc. Matrix printer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2210331A (en) * 1987-09-30 1989-06-07 Seikosha Kk Printer head for use in a dot impact printer
GB2210331B (en) * 1987-09-30 1991-10-09 Seikosha Kk Printer head for use in a dot impact printer
US5846004A (en) * 1994-11-02 1998-12-08 Newbury Data Recording Limited Impact print head
WO2005075915A1 (fr) * 2004-02-10 2005-08-18 Peter Dawson Serpentin echangeur de chaleur a plaque plate et procede de fonctionnement et de nettoyage associes

Also Published As

Publication number Publication date
EP0026549A3 (en) 1982-02-03
BR8006351A (pt) 1981-04-14
DE2939885A1 (de) 1981-04-09
IE51001B1 (en) 1986-09-03
YU250280A (en) 1983-06-30
CA1163137A (fr) 1984-03-06
DE3068363D1 (en) 1984-08-02
DE2939885C2 (de) 1983-10-20
JPS6045593B2 (ja) 1985-10-11
FI69012C (fi) 1985-12-10
US4350450A (en) 1982-09-21
FI803074A7 (fi) 1981-04-03
EP0026549B1 (fr) 1984-06-27
FI69012B (fi) 1985-08-30
IE802040L (en) 1981-04-02
JPS5656884A (en) 1981-05-19

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