EP0223148B1 - Matrixdruckkopf - Google Patents

Matrixdruckkopf Download PDF

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Publication number
EP0223148B1
EP0223148B1 EP86115255A EP86115255A EP0223148B1 EP 0223148 B1 EP0223148 B1 EP 0223148B1 EP 86115255 A EP86115255 A EP 86115255A EP 86115255 A EP86115255 A EP 86115255A EP 0223148 B1 EP0223148 B1 EP 0223148B1
Authority
EP
European Patent Office
Prior art keywords
printing
print head
matrix print
needles
armature
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
Application number
EP86115255A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0223148A1 (de
Inventor
Bernd Dipl.-Ing. Gugel (Fh)
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6286213&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0223148(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Mannesmann AG filed Critical Mannesmann AG
Priority to AT86115255T priority Critical patent/ATE44910T1/de
Publication of EP0223148A1 publication Critical patent/EP0223148A1/de
Application granted granted Critical
Publication of EP0223148B1 publication Critical patent/EP0223148B1/de
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
    • B41J2/275—Actuators for print wires of clapper type

Definitions

  • the invention relates to a matrix printhead with printing needles, which can be driven for printing point-by-point characters on a record carrier either by means of an electromagnetic coil associated with each printing needle with armature for printing, the printing needles being mounted and guided in a front housing and the armatures in a rear housing and the electromagnetic coils and the associated yoke body are combined to form a magnetic block on a base plate and the base plate is connected to the front housing, the armatures are each pivotably mounted between the front housing and one of the legs of the magnetic yoke and with their radially inner part on the one hand with the pressure needle are in frictional engagement during the pressure movement and, on the other hand, rest in the pivoted-back position against an annular disk-shaped, axially acting spring stop which is itself axially fixed to a core bushing.
  • the ribbon is moved transversely to the print medium so that at least two relative movement components occur between the printing needles and the ribbon.
  • so-called ribbon tears occur because the needles tear into the ribbon.
  • a rebound of the armature or an unwanted rebound of the printing needles is also not excluded.
  • the elastic materials of the flat rings continue to cause difficulties with respect to the individual pressure needles. It has been found that the printing needles perform different strokes, which is reflected in a deteriorated print image. Such rebounding matrix printheads also have a very much shorter service life.
  • the invention has for its object to improve the flat rings in such a way that no rebound phenomena of the pressure needles or the armature occur in order to avoid the difficulties outlined.
  • the annular disk-shaped stop consists of vibrations of the anchor-absorbing material with a hardness of between 60 Shore A and 90 Shore A and is fixed to the core sleeve by means of adhesives which are temperature-resistant to a minimum of 100 degrees C. connected is.
  • adhesives which are temperature-resistant to a minimum of 100 degrees C. connected
  • the greatest possible damping is e.g. achieved in that the washer-shaped stop is made of fluorine rubber.
  • the adhesive which is resistant to temperatures of up to 100 degrees C, consists of a two-component adhesive with an epoxy resin as a binder and a modified amide as a hardener.
  • the rebound behavior and the durability of the connection is also positively influenced by the fact that the core sleeve is made of aluminum or an aluminum alloy.
  • the matrix print head In the writing position, the matrix print head is opposite a print abutment 1 or a recording medium 1a and an ink ribbon 1b.
  • the platen 1 is designed as a round cylindrical platen.
  • the matrix print head is divided into a print needle drive assembly 2 and a print needle adjustment assembly 3.
  • the printing needle adjustment assembly 3 is used for the vertical height adjustment of a plurality of printing needles 4 arranged one above the other, a so-called needle gap, in order to write fine writing or fast writing (near letter quality / draft).
  • the pressure needle adjusting assembly 3 is therefore only described in its essential components.
  • the push pin adjustment assembly 3 includes a front housing 5 with an ink ribbon mask 6, in the inner cutout of which a vertically up and down adjustable guide mouthpiece 7 is provided, which is attached to a lever 8.
  • the lever 8 is mounted on the front housing 5 by means of a leaf spring 9 and a screw 10, the leaf spring 9 forming a play-free joint.
  • the lever 8 is adjusted via an electromagnet 11, the lever 8 being pulled in a controlled manner against the core (not shown in more detail) of the electromagnet 11 or being moved away therefrom.
  • the adjustment of the lever 8 thus brings about an adjustment of the guide mouthpiece 7 with all the printing needles 4 in the vertical direction.
  • the pressure needle adjusting assembly 3 is described in more detail in DE-A 3412 856.
  • the printing needles 4 are moved in the direction of their longitudinal extension, ie in the printing direction.
  • For these pressure movements are fastened on an end plate 12 in a base plate 13 in each case yoke body 14 for each individual printing needle 4.
  • the outer legs 14a each carry an electromagnetic coil 14b.
  • the yoke body 14, the base plate 13, the electromagnetic coils 14b form a magnetic block 15.
  • a core bushing 16 is provided in the base plate 13.
  • a centering bushing 19 (FIG. 2) extends into the core bushing 16.
  • a screw 20 rests with its head 21 on a ring shoulder 16a of the core bushing 16 and pulls the centering bushing 19 with its ring shoulder 19a against the ring shoulder 16a, whereby the rear housing 17 is connected to the magnetic block 15 into one unit.
  • a spring washer 22 is inserted under an outer ring shoulder 16b of the core bushing 16, which causes the core bushing 16 to work against the force of the screw 20.
  • a plastic ring 23 forms a pivot bearing 24 for an armature 25, which with its front end 25a in the retracted position of the pressure needle 4 bears snugly against an annular disk-shaped stop 26.
  • the annular disk-shaped stop 26 e.g. made of fluorine rubber
  • the annular disk-shaped stop 26 is glued to the end face of the core sleeve 16 by means of a temperature-resistant adhesive 27.
  • the printing needles 4 rest with their needle heads 4a against the front ends 25a of the anchors 25.
  • the needle heads 4a are pressed by means of coil springs 28 against the stop 25, which are supported against an abutment 29 which is arranged concentrically with needle bores 17a in the rear housing 17.
  • the position of the needle head 4a with respect to the armature 25 is determined by the distance "1".
  • the pivot bearing 24 there are dimensions "a” for the distance from the rear end 25b of the armature 25 to the central axis 30, "b” from the pivot bearing 24 to the center of the needle head 4a when in contact with the front end 25a of the armature 25, “c "from the pivot bearing 24 to the rear end 25b of the armature 25.
  • the dimensions a, b, c determine the energy and force ratios when the armature hits the stop 26 with more than 800 pulses per second.
  • the effect of the layer thickness of the stop 26 and of the adhesive 27 is so damping during the impact that no rebound phenomena occur.
  • the air gap 31 formed on a yoke leg 14a is set extremely precisely in the retracted position and is kept of the same size during a high number of pulses which are generated by energizing the electromagnetic coil 14b in order to generate 4 pressure points on the recording medium 1a with the printing needles.
  • the design of the pressure needle adjustment assembly 3 is not of primary importance with regard to the energy consumption of the electromagnetic coils 14b, the armature 25 and the pressure needles 4, the design of the pressure needle adjustment assembly 3 nevertheless has a constructive effect on the design of the pressure needle drive assembly 2, with certain influences not being completely prevented are.
  • the Drucknadelverstellbautechnik 3 can therefore be designed differently than shown and described in the drawing.
  • the screw 20 is important with regard to the adjustment of the air gap 31, based on the spring washer 22.
  • the needle adjusting assembly 3 it is of course possible to use the needle adjusting assembly 3 to be completely disregarded, ie to store the printing needles 4 in the usual manner within a combined housing, which is formed in one piece by the front housing 5 and the rear housing 17, in conventional guides up to the mouthpiece 7, this mouthpiece then not having to be adjustable.

Landscapes

  • Impact Printers (AREA)
  • Magnetic Heads (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP86115255A 1985-11-16 1986-11-04 Matrixdruckkopf Expired EP0223148B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86115255T ATE44910T1 (de) 1985-11-16 1986-11-04 Matrixdruckkopf.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3540761 1985-11-16
DE19853540761 DE3540761A1 (de) 1985-11-16 1985-11-16 Matrixdruckkopf

Publications (2)

Publication Number Publication Date
EP0223148A1 EP0223148A1 (de) 1987-05-27
EP0223148B1 true EP0223148B1 (de) 1989-07-26

Family

ID=6286213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86115255A Expired EP0223148B1 (de) 1985-11-16 1986-11-04 Matrixdruckkopf

Country Status (5)

Country Link
US (1) US4822187A (enExample)
EP (1) EP0223148B1 (enExample)
JP (1) JPS62121066A (enExample)
AT (1) ATE44910T1 (enExample)
DE (2) DE3540761A1 (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10257014B4 (de) * 2002-12-06 2005-12-01 Tally Computerdrucker Gmbh Matrixnadeldruckkopf für Computerdrucker, insbesondere Druckkopf der Klappankerbauart

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0239947A (ja) * 1988-07-29 1990-02-08 Seikosha Co Ltd 印字ヘッド
EP0418433B1 (de) * 1989-09-18 1994-11-09 MANNESMANN Aktiengesellschaft Matrixnadeldruckkopf
DE4020015C1 (enExample) * 1990-06-20 1991-09-26 Mannesmann Ag, 4000 Duesseldorf, De
US5188466A (en) * 1991-06-27 1993-02-23 Mannesmann Aktiengesellschaft Matrix pin print head with rebound control
JP2806414B2 (ja) * 1992-08-18 1998-09-30 富士通株式会社 電気機械変換アクチュエータおよび印字ヘッド

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3345942A (en) * 1966-06-14 1967-10-10 Moreland Corp Rubber covered roller
US3896918A (en) * 1971-03-04 1975-07-29 Winfried Schneider Mosaic printing head with electromagnetically actuated needles with a common yoke for all electromagnets
FR2287340A1 (fr) * 1974-10-08 1976-05-07 Sagem Perfectionnements apportes aux dispositifs ou tetes d'impression pour imprimantes ou analogues et procede de fabrication d'une telle tete d'impression
US3994218A (en) * 1974-12-18 1976-11-30 Teletype Corporation Energy absorbing print hammer bumper with internal stabilizer
US4051941A (en) * 1976-06-28 1977-10-04 Xerox Corporation Matrix print head with improved armature retainer
US4064799A (en) * 1976-11-26 1977-12-27 Teletype Corporation Print hammer bumper exhibiting dual resiliency characteristics
US4140406A (en) * 1977-06-13 1979-02-20 Dataproducts Dot matrix print head
DE2800218C2 (de) * 1978-01-04 1980-02-07 Triumph Werke Nuernberg Ag, 8500 Nuernberg Nadeldruckkopf
US4230412A (en) * 1978-03-17 1980-10-28 Helmut Falk Matrix print head assembly
US4298656A (en) * 1980-03-28 1981-11-03 Westinghouse Electric Corp. Epoxy-elastomer low temperature curable, solventless, sprayable, stator winding adhesive-bracing compositions
EP0053887B1 (en) * 1980-12-05 1984-06-13 Tokyo Electric Co. Ltd. Printing head of dot printer
IT1163942B (it) * 1983-09-27 1987-04-08 Honeywell Inf Systems Gruppo elettromagnetico di stampa per stampante a mosaico
DE3412855A1 (de) * 1984-04-03 1985-10-03 Mannesmann AG, 4000 Düsseldorf Matrixdruckkopf
US4647236A (en) * 1984-12-07 1987-03-03 Citizen Watch Co., Ltd. Print head
DE8520709U1 (de) * 1985-07-18 1985-10-10 KSA Dichtsysteme GmbH & Co KG, 7143 Vaihingen Flachdichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10257014B4 (de) * 2002-12-06 2005-12-01 Tally Computerdrucker Gmbh Matrixnadeldruckkopf für Computerdrucker, insbesondere Druckkopf der Klappankerbauart

Also Published As

Publication number Publication date
JPS62121066A (ja) 1987-06-02
DE3540761A1 (de) 1987-05-21
DE3664596D1 (en) 1989-08-31
US4822187A (en) 1989-04-18
EP0223148A1 (de) 1987-05-27
DE3540761C2 (enExample) 1989-04-06
ATE44910T1 (de) 1989-08-15

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