EP0157727B1 - Tête d'impression matricielle - Google Patents

Tête d'impression matricielle Download PDF

Info

Publication number
EP0157727B1
EP0157727B1 EP85730036A EP85730036A EP0157727B1 EP 0157727 B1 EP0157727 B1 EP 0157727B1 EP 85730036 A EP85730036 A EP 85730036A EP 85730036 A EP85730036 A EP 85730036A EP 0157727 B1 EP0157727 B1 EP 0157727B1
Authority
EP
European Patent Office
Prior art keywords
print head
hinged
armatures
base plate
magnetic
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
EP85730036A
Other languages
German (de)
English (en)
Other versions
EP0157727A2 (fr
EP0157727A3 (en
Inventor
Bernd Dipl.-Ing. Gugel
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 AT85730036T priority Critical patent/ATE56182T1/de
Publication of EP0157727A2 publication Critical patent/EP0157727A2/fr
Publication of EP0157727A3 publication Critical patent/EP0157727A3/de
Application granted granted Critical
Publication of EP0157727B1 publication Critical patent/EP0157727B1/fr
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
    • 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
    • B41J2/275—Actuators for print wires of clapper 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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/377—Cooling or ventilating arrangements

Definitions

  • the invention relates to a matrix printhead with printing needles that can be driven for printing punctiform characters on a record carrier either by means of an electromagnetic coil assigned to each printing needle with magnetic folding armature for printing, the printing needles resting against the inner ends of the assigned folding anchors and in a front Part of the printhead housing are stored and guided and the magnetic folding anchors in the rear part of the printhead housing and wherein the electromagnetic coils are combined to form a magnetic block on a base plate and the base plate is connected to the printhead housing, the base plate of the magnetic block being together with the magnetic yokes consists of a one-piece coil holder receiving the electromagnetic coils, the coil holder is connected to a coaxially aligned core bushing, the pressure needles extend away from the side of the magnetic flap armature, which is the side facing the base plate r
  • the hinged armature is opposite and the hinged armature pivot point lies between the two hinged armature ends and on the respective inner pole legs of the magnetic yokes.
  • Such matrix print heads produce matrix dots in matrix printers by means of reciprocating movements in front of the parallel printing abutment (platen roller) via an ink ribbon on the recording medium, which result in alphanumeric characters when the recording medium is fed continuously or step by step.
  • the frequency when the individual printing needles are fired is of crucial importance for the printing speed.
  • the structure of the needle drive assembly is essential for printing precision and for the life of the matrix printhead.
  • Matrix printheads with printing needles are known, the construction of which is relatively complicated, so that manufacturing inaccuracies occur in several places, which, in sum, represent considerable bearing errors for printing needles, magnet armatures and other moving parts. For this reason, such matrix print heads operate relatively imprecisely and are subject to great wear, which is also determined in part by heating, so that the service life of such matrix print heads is limited.
  • the matrix print head described at the outset is known from GB-A-2 075 427.
  • the core bushing is not rigidly connected to the coil carrier, but rather is pressed against one another in an adjustable manner by means of an elastic spacer ring and connecting screws, in order to be able to set the stop point for the inner ends of the magnetic folding anchors and thus their air gap.
  • This floating mounting can cause the core bushing to tilt, so that the abutment surface assumes an oblique position and the magnetic flap armature air gaps are no longer the same size as one another.
  • EP-A-0 112 274 which has not been previously published, describes a dot matrix printhead for matrix printers, which contains a coil carrier made of a cast or sprayed base body as a yoke carrier made of electrically non-conductive material, in which pocket-shaped recesses are arranged, in each of which a magnetic yoke made of magnetizable material is inserted .
  • the base body itself is provided with a stop surface which is deliberately related to the plane of all yoke end faces and therefore solves the tolerance problem coming from another side.
  • the invention is therefore based on the object of proposing a matrix print head for matrix printers which, while avoiding the disadvantages described, initially allows economic tolerances in principle with regard to the accuracy of the manufacture of the individual parts or the individual assemblies, and which also has functional stability, i.e. a long service life, and which is ultimately economically mountable.
  • the stated object is achieved according to the invention in the matrix print head described in the introduction in that the coil carrier is rigidly connected to the core bushing, the end face of the core bushing facing the inner hinged anchor ends lying in a precise tolerance distance from the end face of the magnetic yokes by subsequent processing, and in that on the core bushing A stop disk is arranged centrally for the inner ends of the magnetic flap anchors in such a way that its stop face lies at a tolerance distance from the end face of the magnetic yokes.
  • the coil carrier is rigidly connected to the core bushing and the subsequent end face of the core bushing lies in a precise tolerance distance from the end face of the magnetic yokes, it is ensured that the end faces in question are arranged exactly parallel to one another and perpendicular to the longitudinal axis of the print head, so that the air gaps remain constant with each other.
  • the invention combines the advantages of economical production with economical manufacturing tolerance and also has the advantage of reduced assembly time, and the matrix print head according to the invention achieves a stability during operation that has not been achieved so far, so that a longer service life is achieved.
  • the stability of the magnetic block and the low-wear power transmission from the electromagnetic coils to the pressure wires is achieved according to further features of the invention in that the base plate of the magnetic block has a ring forming a base, on which the magnetic yokes are integrally formed and made of the same material in the investment casting process or in the sintering process.
  • the cost-effectiveness of manufacturing an assembly previously composed of several individual parts with appropriate dimensional accuracy, corresponding tolerance quality and corresponding durability is further achieved in that the one-piece coil carrier consists of an iron-silicon alloy.
  • the stop disc as a damping stop means for the backward movement of the magnetic flap armature, covers an end face of the core bushing made of plastic, thermally insulating.
  • the matrix print head with its print needle guide assembly 1, is opposite the print abutment 2, which consists of the platen roller 2a.
  • the ribbon 4 is also located in front of the recording medium 3.
  • the print needle guide assembly 1 has a print needle housing 5 a as part of the print head housing 5.
  • Guides 6 and 7 for the printing needles 8 are arranged in the printing needle housing 5a.
  • the column of printing needles 8, i.e. several, e.g. five to twelve, superimposed printing needles 8 are also guided in the guide mouthpiece 9 very close to the pressure abutment 2.
  • the guide mouthpiece 9 is also fastened to the guide carrier 10 and adjustable in two height positions by means of the stop 11, the spring 12, the electromagnet 13 and the adjustable working air gap 14. However, the height adjustment is not part of the present invention.
  • the pressure needles 8 can therefore also be guided in a height-adjustable manner in the guide mouthpiece 9.
  • the printing needle drive assembly 15 has a connection housing 5b, which is kept by means of shims 16 at a distance from the printing needle housing 5a, which allows the position of the printing needles 8 on the guide mouthpiece 9 to be readjusted or readjusted at any time during the lifetime of the matrix print head.
  • the pressure needles 8 are supported in a rear pressure needle bearing 17 and their needle head 8a abuts against a bearing surface 17a via the compression spring 8b.
  • a magnetic folding armature 18 is provided, which bears against the needle head 8a, is also supported on a conventional plastic ring 19 and can be actuated by means of the electromagnet 20.
  • the electromagnetic coils 21 and the magnetic yokes 22a and 22b with further features are combined to form a magnetic block 23 and shown separately in FIG. 2.
  • the magnet block 23 is drawn without the winding of the electromagnetic coils 21.
  • the magnet block 23 has a base plate 24, which forms a ring 24a, on which the magnet yokes 22a and 22b are integrally formed, so that the base plate 24 (ring 24a) together with the magnet yokes 22a and 22b form a one-piece coil carrier 25 .
  • the base plate 24 is connected to a core bushing 27 by a press connection 26.
  • the core bushing 27 forms a transition to a receiving collar 27b by means of ribs 27a.
  • the core bushing 27 is machined on the end face 28 or on the end face 29, if machining should not have already become unnecessary due to the manufacturing process (investment casting process, sintering process).
  • the stop disc 31 On the core sleeve 27 is the stop disc 31, which consists of a tough and wear-resistant plastic or the like.
  • the core bushing 27 is simultaneously configured to form a heat sink 32 with cooling fins 33.
  • the stop disc 31 forms a centering projection 31a, a stop surface 31b, which is of course at a tolerance distance from the end face 29.
  • the stop disk 31 also forms a recess 31c between two ribs 27a, through which connecting cables 34a and 34b run to the electromagnetic coils 21 (FIG. 3).
  • FIG. 1 Another design of a stop disk 35, which, however, fulfills the same functions and properties of the stop disk (31), is shown in Fig. 1, the only differences tion represents the laying of the recesses 31c: There are other recesses 36 through the ring 24a and through the receiving collar 27b. However, both the recess 31c and the recess 36 lie within the largest diameter of the matrix print head.

Landscapes

  • Impact Printers (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Magnetic Heads (AREA)

Claims (6)

1. Tête d'impression à matrice, comportant des aiguilles d'impression (8), qui, pour former par points des caractères sur un support d'enregistrement (3), peuvent être entraînées, à volonté, pour l'impression au moyen d'une bobine électromagnétique (21 associée à chaque aiguille d'impression (8), à armatures battantes magnétiques (18), les aiguilles d'impression (8) étant adjacentes aux extrémités internes des armatures battantes (18) associées, et montées et guidées dans une partie avant du carter (5) de la tête d'impression, et les armatures battantes (18) dans la partie arrière du carter (5) de la tête d'impression, et les bobines électromagnétiques (21) étant réunies en un bloc magnétique (23) sur une plaque de base (24) et la plaque de base (24) étant reliée au carter (5) de la tête d'impression, la plaque de base (24) du bloc magnétique (23) en même temps que les culasses magnétiques (22a et 22b) étant constituées d'un support de bobines (25) en une pièce, recevant les bobines électromagnétiques (21), le support de bobines (25) étant relié à une boîte à noyau (27) centrée coaxialement, les aiguilles d'impression (8) s'étendant depuis le côté des armatures battantes (18), qui est opposé au côté de ces armatures battantes (18), proche de la plaque de base (24), et le pivot des armatures battantes se trouvant entre les deux extrémités des armatures battantes et sur les parties saillantes polaires internes respectives (22b) des culasses magnétiques (22a, 22b), caractérisée en ce que le support de bobines (25) est solidaire de la boîte à noyau (27), la face frontale (28), proche des extrémités internes des armatures battantes, de la boîte à noyau (27) se trouvant à une distance de tolérance (30) précise par rapport à la face frontale (29) des culasses magnétiques (22a, 22b) grâce à un traitement ultérieur, et en ce que, sur la boîte à noyau (27), de façon centrée pour les extrémités internes des armatures battantes (18), est agencé un disque de butée (31), de façon que sa surface de butée (31b) se trouve à une distance de tolérance par rapport à la face frontale (29) des culasses magnétiques (22a, 22b).
2. Tête d'impression à matrice selon la revendication 1, caractérisée en ce que la plaque de base (24) du bloc magnétique (23) présente une bague (24a) formant une base, sur laquelle les culasses magnétiques (22a, 22b) sont formées en une pièce et à partir de la même matière, selon le procédé de coulée fine ou le procédé de frittage.
3. Tête d'impression à matrice selon la revendication 2, caractérisée en ce que le support de bobines (25) en une pièce est constitué d'un alliage fer-silicium.
4. Tête d'impression à matrice selon les revendications 1 à 3, caractérisée en ce que le support de bobines (25) est riveté à la boîte a noyau (27).
5. Tête d'impression à matrice selon une ou plusieurs des revendications 1 à 4, caractérisée en ce que le disque de butée (31 ), en tant que moyen de butée amortisseur pour le mouvement de retour des armatures battantes (18), recouvre, de façon thermiquement isolante, une face frontale (28), proche du carter (5a) des aiguilles d'impression réalisé en matière synthétique, de la boîte à noyau (27).
6. Tête d'impression à matrice selon la revendication 5, caractérisée en ce que le disque de butée (31) thermiquement isolant et amortissant les mouvements des armatures battantes est muni d'évidements (31c) pour des câbles de raccordement (34a ou 34b) aux bobines électromagnétiques (21).
EP85730036A 1984-04-03 1985-03-05 Tête d'impression matricielle Expired - Lifetime EP0157727B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85730036T ATE56182T1 (de) 1984-04-03 1985-03-05 Matrixdruckkopf.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843412855 DE3412855A1 (de) 1984-04-03 1984-04-03 Matrixdruckkopf
DE3412855 1984-04-03

Publications (3)

Publication Number Publication Date
EP0157727A2 EP0157727A2 (fr) 1985-10-09
EP0157727A3 EP0157727A3 (en) 1986-12-30
EP0157727B1 true EP0157727B1 (fr) 1990-09-05

Family

ID=6232783

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85730036A Expired - Lifetime EP0157727B1 (fr) 1984-04-03 1985-03-05 Tête d'impression matricielle

Country Status (4)

Country Link
EP (1) EP0157727B1 (fr)
JP (1) JPS60225764A (fr)
AT (1) ATE56182T1 (fr)
DE (2) DE3412855A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104553346A (zh) * 2013-10-21 2015-04-29 大连中盈科技有限公司 可连续打印的针式打印机打印头

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3540761A1 (de) * 1985-11-16 1987-05-21 Mannesmann Ag Matrixdruckkopf
DE3889662D1 (de) * 1988-12-01 1994-06-23 Mannesmann Ag Matrixnadeldruckkopf der Klappankerbauart.
US5163759A (en) * 1990-10-10 1992-11-17 Brady Usa, Inc. Signmaking machine using character forming tool for overlapping impacts and web scoring
US5865544A (en) * 1997-04-18 1999-02-02 Panini S.P.A. Dot-matrix print head, in particular for magnetic ink printers
CN102744975B (zh) * 2011-04-22 2014-12-03 多美科信息科技（深圳）有限公司 打印头

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2075427A (en) * 1978-03-17 1981-11-18 Donald G Hebert Wire matrix print head assembly

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4230038A (en) * 1977-06-23 1980-10-28 Helmut Falk Matrix print head assembly
DE2800218C2 (de) * 1978-01-04 1980-02-07 Triumph Werke Nuernberg Ag, 8500 Nuernberg Nadeldruckkopf
JPS5734979A (en) * 1980-08-11 1982-02-25 Brother Ind Ltd Type head for dot printer
JPS6212613Y2 (fr) * 1980-08-11 1987-04-01
DE3164230D1 (en) * 1980-12-05 1984-07-19 Tokyo Electric Co Ltd Printing head of dot printer
JPS57201669A (en) * 1981-06-04 1982-12-10 Tokyo Electric Co Ltd Printing head for dot printer
JPS5818373U (ja) * 1981-07-24 1983-02-04 日本電気株式会社 電子機器装置
JPS58117935U (ja) * 1982-02-05 1983-08-11 東芝テック株式会社 ドツトプリンタの印字ヘツド
JPS58145737U (ja) * 1982-03-26 1983-09-30 東芝テック株式会社 ドツトプリンタの印字ヘツド
JPS58177373A (ja) * 1982-04-12 1983-10-18 Hitachi Ltd 印字ヘツド
DE3243475A1 (de) * 1982-11-22 1984-05-24 Mannesmann AG, 4000 Düsseldorf Nadeldruckkopf fuer matrixdrucker

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2075427A (en) * 1978-03-17 1981-11-18 Donald G Hebert Wire matrix print head assembly

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104553346A (zh) * 2013-10-21 2015-04-29 大连中盈科技有限公司 可连续打印的针式打印机打印头

Also Published As

Publication number Publication date
EP0157727A2 (fr) 1985-10-09
EP0157727A3 (en) 1986-12-30
DE3412855A1 (de) 1985-10-03
JPH0481513B2 (fr) 1992-12-24
JPS60225764A (ja) 1985-11-11
DE3579487D1 (de) 1990-10-11
ATE56182T1 (de) 1990-09-15
DE3412855C2 (fr) 1991-06-13

Similar Documents

Publication Publication Date Title
DE2456816C3 (de) Druckkopf für Drahtdrucker
DE3133083A1 (de) "ballistischer drahtmatrix-druckkopf"
DE2908413A1 (de) Lineare betaetigungsvorrichtung
DE3715304C2 (fr)
DE2119415B2 (de) Elektromagnetischer Antrieb für die Nadel eines Nadeldruckers
EP0157727B1 (fr) Tête d'impression matricielle
DE1245627B (de) Druckhammereinrichtung
DE2629267A1 (de) Antriebsvorrichtung fuer einen draht-matrixdrucker
EP0112273B1 (fr) Tête d'impression à aiguilles pour imprimante à matrice de points
EP0338176B1 (fr) Tête d'impression pour imprimante matricielle à aiguilles
EP0150663B1 (fr) Tête d'impression matricielle avec guidage réglable des aiguilles d'impression
DE2445438A1 (de) Elektromagnetisches antriebselement fuer den schreibkopf eines punktmatrixschreibers sowie fuer eine verwendung des antriebselementes geeigneter schreibkopf
EP0157725B1 (fr) Tête d'impression matricielle avec guidage réglable des aiguilles d'impression
EP0098316B1 (fr) Dispositif à cadre oscillant pour les éléments d'impression d'une imprimante matricielle à la ligne
EP0188672B1 (fr) Tête d'impression en matrice
EP0371183B1 (fr) Tête d'impression matricielle à aiguilles du type à armature battante
DE3141816C2 (fr)
EP0188671A1 (fr) Procédé de fabrication d'un agencement de construction d'armatures pour têtes d'impression en matrices
EP0188669B1 (fr) Tête d'impression en matrice
EP0163592B1 (fr) Tête d'impression matricielle avec guidage réglable des aiguilles d'impression
EP0371182B1 (fr) Tête d'impression matricielle à aiguilles du type à armature battante
DE3147449C2 (de) Elektrodynamische Anschlagvorrichtung für ein Druckwerk in Schreib- oder ähnlichen Büromaschinen
EP0314851B1 (fr) Imprimante à matrice d'aiguilles ayant un guidage réglable des aiguilles d'impression
DE3531885A1 (de) Druckwerkskopf fuer einen punkt-linien-drucker
EP0408158A2 (fr) Tête d'impression par matrice de points

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

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI NL

17P Request for examination filed

Effective date: 19850907

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE FR GB IT LI NL

17Q First examination report despatched

Effective date: 19880411

ITF It: translation for a ep patent filed

Owner name: GUZZI E RAVIZZA S.R.L.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB IT LI NL

REF Corresponds to:

Ref document number: 56182

Country of ref document: AT

Date of ref document: 19900915

Kind code of ref document: T

ET Fr: translation filed
REF Corresponds to:

Ref document number: 3579487

Country of ref document: DE

Date of ref document: 19901011

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19910219

Year of fee payment: 7

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

Ref country code: AT

Payment date: 19910226

Year of fee payment: 7

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

Ref country code: BE

Effective date: 19910331

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
BERE Be: lapsed

Owner name: MANNESMANN A.G.

Effective date: 19910331

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

Ref country code: NL

Effective date: 19911001

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19920305

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

Ref country code: LI

Effective date: 19920331

Ref country code: CH

Effective date: 19920331

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19950213

Year of fee payment: 11

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

Ref country code: FR

Payment date: 19950217

Year of fee payment: 11

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

Ref country code: GB

Effective date: 19960305

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

Effective date: 19960305

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

Ref country code: FR

Effective date: 19961129

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

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

Ref country code: DE

Payment date: 19980415

Year of fee payment: 14

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: 20000101