EP0338514A2 - Geräuscharmer Druckkopfzusammenbau - Google Patents

Geräuscharmer Druckkopfzusammenbau Download PDF

Info

Publication number
EP0338514A2
EP0338514A2 EP89106942A EP89106942A EP0338514A2 EP 0338514 A2 EP0338514 A2 EP 0338514A2 EP 89106942 A EP89106942 A EP 89106942A EP 89106942 A EP89106942 A EP 89106942A EP 0338514 A2 EP0338514 A2 EP 0338514A2
Authority
EP
European Patent Office
Prior art keywords
print
stopper plate
armature
printer head
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.)
Granted
Application number
EP89106942A
Other languages
English (en)
French (fr)
Other versions
EP0338514B1 (de
EP0338514A3 (en
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

Links

Images

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 10 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)
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 true EP0338514A2 (de) 1989-10-25
EP0338514A3 EP0338514A3 (en) 1990-08-22
EP0338514B1 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)

Cited By (1)

* 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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Cited By (1)

* 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

Also Published As

Publication number Publication date
DE68907435T2 (de) 1993-10-14
DE68907435D1 (de) 1993-08-12
JPH01267049A (ja) 1989-10-24
EP0338514B1 (de) 1993-07-07
EP0338514A3 (en) 1990-08-22

Similar Documents

Publication Publication Date Title
EP0338514B1 (de) Geräuscharmer Druckkopfzusammenbau
EP0156547B1 (de) Punktdruckkopf
KR880008885A (ko) 단일 조각 전기자를 사용한 프린트 헤드
JPH06171120A (ja) インパクトプリンタの制御装置
JPS60178078A (ja) プリンタ
US4496253A (en) Impact hammer
EP0383555B1 (de) Schlagpunktdruckkopf
EP0576274B1 (de) Druckkopf mit Druckdrähten
JPS59115870A (ja) 印刷ワイヤ・アクチユエ−タ
JPS59103773A (ja) デ−ジ−ホイ−ルプリンタ
KR850003345Y1 (ko) 도트임팩트 프린터의 인자헤드
JPS6224530Y2 (de)
EP0305137A2 (de) Punktnadeldruckkopf
JPH022710B2 (de)
US4822188A (en) Printing mechanism
EP0350964A3 (de) Druckhammermechanismus
JPS63153156A (ja) ワイヤドツトヘツド
JPH01190461A (ja) インパクトドットヘッド
KR850003347Y1 (ko) 도트임팩트 프린터(dot impact printer)의 인자헤드
JPS597086Y2 (ja) フライングプリンタ
JPH0667623B2 (ja) インパクトドツトヘツド
JPH0585355B2 (de)
JPS612572A (ja) ドツトプリンタ印字ヘツド用可動装置
JPS61290071A (ja) プリンタのハンマ−駆動方式
JPH0232859A (ja) 印字ヘッド

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19890418

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB

17Q First examination report despatched

Effective date: 19920814

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

ET Fr: translation filed
REF Corresponds to:

Ref document number: 68907435

Country of ref document: DE

Date of ref document: 19930812

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20060410

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20060412

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20060413

Year of fee payment: 18

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20070418

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20071101

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070418

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070430