EP0338638A1 - Imprimante à aiguilles - Google Patents

Imprimante à aiguilles Download PDF

Info

Publication number
EP0338638A1
EP0338638A1 EP89200975A EP89200975A EP0338638A1 EP 0338638 A1 EP0338638 A1 EP 0338638A1 EP 89200975 A EP89200975 A EP 89200975A EP 89200975 A EP89200975 A EP 89200975A EP 0338638 A1 EP0338638 A1 EP 0338638A1
Authority
EP
European Patent Office
Prior art keywords
dot matrix
matrix printer
printer according
magnetic field
elastically deformable
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.)
Withdrawn
Application number
EP89200975A
Other languages
German (de)
English (en)
Inventor
August Deis
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 EP0338638A1 publication Critical patent/EP0338638A1/fr
Withdrawn legal-status Critical Current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
    • B41J2/235—Print head assemblies
    • B41J2/25—Print wires
    • 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
    • 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
    • B41J9/00—Hammer-impression mechanisms
    • B41J9/26—Means for operating hammers to effect impression
    • B41J9/38—Electromagnetic means

Definitions

  • the invention relates to a dot matrix printer in which the actuation of the needles takes place using the force exerted on a current-carrying conductor in a magnetic field.
  • a dot matrix printer of the type mentioned is z. B. become known from DE-OS 24 06 132.
  • the known design contains a stop device for dot printers with an electrodynamic coil, which is firmly connected to a stop hammer, is exposed to the action of at least one magnetic field substantially perpendicular to its plane and is connected to a fixed holder by means of an elastically deformable suspension part.
  • the electrodynamic coil is formed by at least one spiral cut from a thin metal foil, while the elastic suspension part is formed by metal bands which are coplanar with each other and with the spiral.
  • the spirals cut from the metal foils are connected to non-magnetic side plates.
  • the device which can be rotated about a fixed axis via the elastic metal bands, is positively connected to a stop hammer which can interact with an anvil.
  • the known design has a complicated structure and many parts to be moved.
  • the invention has for its object to simplify the structure of a dot matrix printer of the type mentioned.
  • This object is achieved according to the invention in that at least one clamped, resilient, elastically deformable conductor element is provided which is provided with a pressure needle at the point of its greatest deflection.
  • Such a design has small masses to be moved and thus enables high printing speeds.
  • the construction is very simple and not susceptible to faults.
  • a special return spring is not required since the conductor element, which is designed as a single conductor, is elastically deformable.
  • the pressure needle is attached at the point at which the elastically deformable conductor element experiences its greatest deflection when current is passed.
  • the paper to be printed is arranged at such a distance in front of the printing needle that the printing needle cannot vibrate.
  • the design according to the invention also has a low level of noise since only a fraction of the components can be moved in comparison with known designs. This also means a lower power requirement. Overall, this results in a longer service life compared to known designs.
  • the elastically deformable conductor element is selected such that the force required for deflection and thus for pressure when passing through the elastic element is as small as possible.
  • the conductor element is a wire bracket clamped at the end, the legs of the wire bracket starting from the clamping point lying in differently directed magnetic fields and the pressure needle on the free connecting leg Bracket part is arranged.
  • a straight wire, clamped at its ends is provided as the conductor element, which lies in a magnetic field directed in the same direction and is provided with the pressure needle in the central region.
  • Such a single wire can easily be clamped at both ends.
  • the spring constants required to achieve a maximum deflection with a minimal energy supply can also be easily determined.
  • the conductor element is a square-shaped loop, which is penetrated by a magnetic field directed in the same direction, one corner being provided with a pressure needle, while the opposite corner is designed as a power supply and discharge.
  • the loop is contracted and thus the tip of the loop provided with the pressure needle is deflected.
  • Attachment of the wire bracket or loops mentioned above can, for. B. in a simple manner by soldering the loop or loop end into a circuit board.
  • the elastically deformable conductor elements can either be arranged within a print head which can be displaced along a printing line, but they can also, according to a further advantageous embodiment, be arranged in a fixed manner over the printing width of the printer.
  • a preferred embodiment of the object according to the invention is that a permanent magnet is provided which extends across the width of the pressure roller and is approximately crescent-shaped in cross-section, in the magnetic field of which there is a family of elastically deformable conductor elements. These conductor elements are preferably located within a frame that extends across the width of the magnet, the conductor elements being arranged obliquely to the magnetic field lines. Due to the more or less oblique arrangement of the conductor elements, the size of the force generated during the passage of current in cooperation with the magnetic field is set.
  • FIG. 1 schematically shows a perspective view of two permanent magnets 10 and 11, between the poles of which a magnetic field 12 is built up.
  • this magnetic field there are three bow-shaped, elastically deformable conductor elements 13, which are firmly clamped at one end 13a at 14 and each carry a pressure needle 15 at their free end 13b.
  • the brackets 13 are supplied with current via a transformer 16, the brackets 13 are deflected elastically in the direction 17 and thus the printing needles 15 move in the direction of a printing roller (not shown).
  • the elastically deformable conductor elements are designed as individual wires 18 clamped on both sides, which are provided with the pressure needles 15 at the point of their greatest deflection.
  • the magnetic field 12 extends at right angles to the wires 18 and to the deflection in the direction 17.
  • Fig. 3 shows a further variant, according to which the elastically deformable conductor element is bent in the form of a square, one corner of which is provided with a pressure needle 15.
  • the loop 19 thus formed has on the side opposite the pressure needle the power supply and discharge. As soon as the loop is supplied with current, the loop contracts in the direction of 20 and thus the needle 15 is deflected in the direction of the 17th
  • FIG. 4 shows a perspective partial view of a permanent magnet 21 which is approximately crescent-shaped in cross section and which forms a magnetic field 12 between its poles.
  • a frame 22 (see FIG. 5) which is provided with obliquely arranged, elastically deformable conductor elements 23.
  • 24 denotes an ink ribbon and 25 denotes a paper to be printed.
  • the conductor elements designed as elastically deformable individual wires 23 are clamped in the frame 22 and are supplied with current via a circuit 26.
  • the frame 22 may be a printed circuit board, the wiring 26 and the elastic wires 23 in one operation, e.g. B. etching can be produced.
  • Fig. 6 shows a schematic, perspective partial view of a type, wherein the elastically deformable conductor elements are designed as leaf springs 29 which are assigned to individual partial magnets 30. With 31 soft iron parts are designated.
  • Fig. 7 shows the deflection of a conductor element as a function of time. 33 denotes the maximum needle stroke and 34 the power switch-on time.
  • FIG. 8 shows a perspective illustration of a print head according to the exemplary embodiment according to FIGS. 4 and 5.
  • the print head contains the approximately crescent-shaped permanent magnet 21 which extends over the entire width of the paper 25 to be printed and which, according to FIG. 4, has a magnetic field between its poles 12 trains.
  • This magnetic field not shown in FIG. 8, lies the frame 22 with the obliquely arranged, elastically deformable conductor elements 23.
  • a non-magnetic material 35 which fills the cavity of the crescent-shaped permanent magnet, serves as an abutment for the pressure elements Paper is arched.
  • 36 are paper feed rollers, 37 paper transport rollers and 38 is a paper guide.
  • the frame 22 with the conductor elements 23, on which the printing needles 15 are formed, is held by a fixed support 39.
  • the ink ribbon 24 runs between the needles 15 and the paper to be printed and is conveyed by ink ribbon transport rollers 40. Since the print head with the magnet 21 and the conductor elements 23 carrying the needles 15 extends over the entire width of the paper 25 to be printed, no longitudinal movement of the print head takes place in this embodiment.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Impact Printers (AREA)
EP89200975A 1988-04-21 1989-04-17 Imprimante à aiguilles Withdrawn EP0338638A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3813420 1988-04-21
DE19883813420 DE3813420A1 (de) 1988-04-21 1988-04-21 Nadeldrucker

Publications (1)

Publication Number Publication Date
EP0338638A1 true EP0338638A1 (fr) 1989-10-25

Family

ID=6352556

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89200975A Withdrawn EP0338638A1 (fr) 1988-04-21 1989-04-17 Imprimante à aiguilles

Country Status (3)

Country Link
EP (1) EP0338638A1 (fr)
JP (1) JPH0211337A (fr)
DE (1) DE3813420A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990013171A1 (fr) * 1989-04-15 1990-11-01 William Henry Woodward Actionneur lineaire

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1332078A (en) * 1970-08-12 1973-10-03 Ibm Electromagnetic print hammer apparatus
DE2030310B2 (de) * 1969-06-24 1975-02-20 Mohawk Data Sciences Corp., Stoneham, Mass. (V.St.A.) Druckhammeranordnung
GB1423518A (en) * 1972-03-02 1976-02-04 Emi Ltd Print heads
US4493568A (en) * 1983-02-22 1985-01-15 Estabrooks David A Dot matrix printhead employing moving coils
US4600322A (en) * 1984-03-07 1986-07-15 Battelle Memorial Institute Needle matrix printer
US4732498A (en) * 1984-12-19 1988-03-22 Battelle Memorial Institute Needle matrix printer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2030310B2 (de) * 1969-06-24 1975-02-20 Mohawk Data Sciences Corp., Stoneham, Mass. (V.St.A.) Druckhammeranordnung
GB1332078A (en) * 1970-08-12 1973-10-03 Ibm Electromagnetic print hammer apparatus
GB1423518A (en) * 1972-03-02 1976-02-04 Emi Ltd Print heads
US4493568A (en) * 1983-02-22 1985-01-15 Estabrooks David A Dot matrix printhead employing moving coils
US4600322A (en) * 1984-03-07 1986-07-15 Battelle Memorial Institute Needle matrix printer
US4732498A (en) * 1984-12-19 1988-03-22 Battelle Memorial Institute Needle matrix printer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990013171A1 (fr) * 1989-04-15 1990-11-01 William Henry Woodward Actionneur lineaire

Also Published As

Publication number Publication date
DE3813420A1 (de) 1989-11-02
JPH0211337A (ja) 1990-01-16

Similar Documents

Publication Publication Date Title
DE2630931C3 (de) Antriebseinrichtung für einen Nadeldrucker
DE2920732C2 (fr)
DE2256813A1 (de) Nadeldrucker
DE3031855A1 (de) Druckkopf.
DE2910859C2 (fr)
DE3419912C2 (fr)
DE2420005A1 (de) Matrixdruckvorrichtung
DE2628944C2 (de) Rückstelleinrichtung für die Klappanker in einem Mosaikdruckkopf
CH649041A5 (de) Solenoid mit einem druckdraht fuer einen rasterdrucker.
DE2800880C3 (de) Drahtdrucker
DE2624761B2 (de) Druckhammervorrichtung
DE2716617A1 (de) Nadeldruckkopf
DE2558380A1 (de) Vorrichtung zum punktweisen einwirken auf einen informationstraeger
DE2306309C2 (de) Elektromagnetische Antriebseinrichtung für einen Schnelldrucker
DE2449235A1 (de) Druckvorrichtung mit drahtmatrixdruckerkopf
DE2230224C2 (de) Druckhammereinheit
DE2809428A1 (de) Druckvorrichtung
EP0028314A2 (fr) Dispositif de déclenchement électromagnétique, en particulier pour l'actionnement de marteaux d'impression
DE2717077A1 (de) Mosaikdruckkopf
EP0338638A1 (fr) Imprimante à aiguilles
DE3110798A1 (de) Druckkopf
DE3140435A1 (de) Druckwerk
EP0040883A2 (fr) Imprimante par points avec ajustement magnétique de la tête d'impression
DE577924C (de) Elektromagneitsches Relais, bei dem die Endlage des ohne Zuhilfenahme einer Hebelwirkung auf Kontakte einwirkenden Ankers durch Dreipunktauflage bestimmt ist
DE2825527A1 (de) Druckvorrichtung

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

Kind code of ref document: A1

Designated state(s): DE FR GB IT SE

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19900426