EP0338514B1 - Geräuscharmer Druckkopfzusammenbau - Google Patents

Geräuscharmer Druckkopfzusammenbau Download PDF

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Publication number
EP0338514B1
EP0338514B1 EP19890106942 EP89106942A EP0338514B1 EP 0338514 B1 EP0338514 B1 EP 0338514B1 EP 19890106942 EP19890106942 EP 19890106942 EP 89106942 A EP89106942 A EP 89106942A EP 0338514 B1 EP0338514 B1 EP 0338514B1
Authority
EP
European Patent Office
Prior art keywords
stopper plate
printer head
print
armature
print position
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
EP19890106942
Other languages
English (en)
French (fr)
Other versions
EP0338514A3 (en
EP0338514A2 (de
Inventor
Kishiharu C/O Nec Corporation Itazu
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Publication of EP0338514A2 publication Critical patent/EP0338514A2/de
Publication of EP0338514A3 publication Critical patent/EP0338514A3/en
Application granted granted Critical
Publication of EP0338514B1 publication Critical patent/EP0338514B1/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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/10—Sound-deadening devices embodied in machines

Definitions

  • the present invention relates generally to dot matrix printer heads, and more specifically to a low-noise dot matrix printer head.
  • the printer head comprises a print wire movable between a non-print position and a print position, an armature connected to the print wire, a stopper plate, a return spring for biasing the armature into contact with the stopper plate, and an electromagnet which drives the armature against the spring in response to energization of the electromagnet so that the print wire is moved from the non-print position to the print position and causes the spring to restore the armature to the non-print position in response to deenergization of the magnet.
  • a heat sink In thermal contact with the electromagnet is a heat sink having a rear part that extends beyond the stopper plate to an elastic rear panel to form a sound absorption air chamber therebetween.
  • a dot matrix printer head assembly is illustrated.
  • the head assembly is composed of a plurality of print heads 1.
  • 24 print heads are radially arranged and mounted on a front panel structure 2 within an aluminum heat sink 3 at 15° annular intervals.
  • Each print head 1 comprises a magnetic core 4, a coil 5, an armature 6, and a print wire 7 which extends through guides 8 to the front end of the assembly.
  • Armature 6 has its lower end firmly secured to the rear end of print wire 7 and is normally biased by a spring 9 to the right into contact with a stopper 10a of a stopper plate 10. All print wires 7 are arranged on the front end of the assembly in a 4 x 6 matrix array.
  • Heat sink 3 has an annular inner wall which is in intimate contact with the cores 2 to extract heat therefrom and extends rearward beyond the stopper plate 10 to define an air chamber 11 with a rubber rear panel 12.
  • the air chamber 11 is open to the outside through an opening 11a formed on the bottom of the assembly to allow heat produced in the cores 4 to escape to the outside.
  • the armature 6 Upon energization of the coil 5, the armature 6 rotates clockwise about a pivot point 6a against the spring 9 so that the print wire 7 moves forward from a non-print position to a print position.
  • the energy stored in the spring 9 is liberated, causing the associated armature 6 to return to the normal position and hit the stopper 7a with a substantial amount of force.
  • the impact force on the stopper 10a causes stopper plate 10 and the air in the chamber 11 to vibrate, generating noise in the air chamber 11.
  • the noise is insulated by the heat sink 3 and absorbed by the elastic rear panel 12.
  • the noise level of the printer head assembly can be reduced by approximately 1.5 dB and by the provision of the air chamber 11 behind the stopper plate 10, the noise level can be further reduced in proportion to the distance "L" between it and the rear panel 12.
  • the noise level was reduced by more than 3 dB with a distance of 3 mm in comparison with a printer head without the elastic rear panel and a noise reduction of about 4 dB was achieved with a distance of 10 mm. Since the air chamber 11 can be communicated with the interior of a printer through opening 11a when the head assembly is installed, the noise energy generated by the printer head can be further reduced by aborption by the printer housing.

Landscapes

  • Impact Printers (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)

Claims (6)

  1. Druckkopf mit einer zwischen einer Nicht-Druckposition und einer Druckposition bewegbaren Drucknadel, einem mit der Drucknadel verbundenen Anker, einer Anschlagplatte, einer Feder, um den Anker mit der Anschlagplatte in Kontakt vorzuspannen, einer elektromagnetischen Antriebseinrichtung, um den Anker beim Einschalten gegen die Feder zu treiben, so daß die Drucknadel von der Nicht-Druckposition zur Druckposition bewegt wird, wobei sie die Feder veranlaßt, den Anker beim Abschalten zur Nicht-Druckposition zurückzustellen, und mit einem mit der elektromagnetischen Antriebseinrichtung in thermischem Kontakt stehenden Kühlkörper, gekennzeichnet durch eine von der Anschlagplatte beabstandete, elastische Rückwand und wobei der Kühlkörper sich über die Anschlagplatte hinaus zur Rückwand erstreckt, um hinter der Anschlagplatte eine Luftkammer zu bilden.
  2. Druckkopf nach Anspruch 1, wobei die Luftkammer über eine im Bodenabschnitt des Druckkopfs ausgebildete Öffnung nach außen offen ist.
  3. Druckkopf nach Anspruch 1 oder 2, wobei die Abmessung der Luftkammer zwischen der Anschlagplatte und der Rückwand zwischen 3 mm und 10 mm beträgt.
  4. Matrixdruckkopfanordnung mit:
       einer Anschlagplatte;
       mehreren Druckköpfen, die jeweils aufweisen: eine zwischen einer Nicht-Druckposition und einer Druckposition bewegbare Drucknadel, einen mit der Drucknadel verbundenen Anker, eine Feder, um den Anker mit der Anschlagplatte in Kontakt vorzuspannen, eine elektromagnetische Antriebseinrichtung, die den Anker beim Einschalten gegen die Feder treibt, so daß die Drucknadel von der Nicht-Druckposition zur Druckposition bewegt wird, und die die Feder veranlaßt, den Anker beim Ausschalten in die Nicht-Druckposition zurückzustellen, wobei die Drucknadeln der Druckköpfe eine Matrix am vorderen Ende der Druckkopfanordnung bilden, und einen mit der elektromagnetischen Antriebseinrichtung in thermischem Kontakt stehenden Kühlkörper, gekennzeichnet durch eine von der Anschlagplatte beabstandete, elastische Rückwand und wobei der Kühlkörper sich über die Anschlagplatte hinaus zur Rückwand erstreckt, um zwischen der Anschlagplatte und der elastischen Rückwand eine Luftkammer zu bilden.
  5. Matrixdruckkopfanordnung nach Anspruch 4, wobei die Luftkammer über eine im Bodenabschnitt der Druckkopfanordnung ausgebildete Öffnung nach außen offen ist.
  6. Matrixdruckkopfanordnung nach Anspruch 4 oder 5, wobei die Abmessung der Luftkammer zwischen der Anschlagplatte und der Rückwand zwischen 3 mm und 10 mm beträgt.
EP19890106942 1988-04-19 1989-04-18 Geräuscharmer Druckkopfzusammenbau Expired - Lifetime EP0338514B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP97225/88 1988-04-19
JP9722588A JPH01267049A (ja) 1988-04-19 1988-04-19 印字ヘッド組立体

Publications (3)

Publication Number Publication Date
EP0338514A2 EP0338514A2 (de) 1989-10-25
EP0338514A3 EP0338514A3 (en) 1990-08-22
EP0338514B1 true EP0338514B1 (de) 1993-07-07

Family

ID=14186690

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890106942 Expired - Lifetime EP0338514B1 (de) 1988-04-19 1989-04-18 Geräuscharmer Druckkopfzusammenbau

Country Status (3)

Country Link
EP (1) EP0338514B1 (de)
JP (1) JPH01267049A (de)
DE (1) DE68907435T2 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9001868U1 (de) * 1990-02-16 1991-06-20 Siemens Nixdorf Informationssysteme AG, 4790 Paderborn Kapselung für einen Nadeldruckkopf
EP0768184B1 (de) * 1992-06-23 2000-05-24 Fujitsu Limited Druckkopf mit Druckdrähten

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3918567A (en) * 1973-03-28 1975-11-11 Edward D Kittredge Process printing
US4401026A (en) * 1977-09-14 1983-08-30 Exxon Reserach And Engineering Co. Free flight hammer for impact printer
SE425067B (sv) * 1981-01-19 1982-08-30 Facit Ab Tryckhammare for skrivare och skrivmaskiner

Also Published As

Publication number Publication date
DE68907435T2 (de) 1993-10-14
DE68907435D1 (de) 1993-08-12
JPH01267049A (ja) 1989-10-24
EP0338514A3 (en) 1990-08-22
EP0338514A2 (de) 1989-10-25

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