EP0260732A1 - Aimant d'actionnement pour une aiguille d'impression d'une imprimante à mosaique - Google Patents

Aimant d'actionnement pour une aiguille d'impression d'une imprimante à mosaique Download PDF

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Publication number
EP0260732A1
EP0260732A1 EP87201528A EP87201528A EP0260732A1 EP 0260732 A1 EP0260732 A1 EP 0260732A1 EP 87201528 A EP87201528 A EP 87201528A EP 87201528 A EP87201528 A EP 87201528A EP 0260732 A1 EP0260732 A1 EP 0260732A1
Authority
EP
European Patent Office
Prior art keywords
permanent magnet
magnetic
yoke
pole
printing needle
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Withdrawn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
EP87201528A
Other languages
German (de)
English (en)
Inventor
Bernd Dr. Aldefeld
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 Corporate Intellectual Property GmbH
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 Corporate Intellectual Property GmbH, Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Corporate Intellectual Property GmbH
Publication of EP0260732A1 publication Critical patent/EP0260732A1/fr
Withdrawn legal-status Critical Current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
    • B41J2/285—Actuators for print wires of plunger type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F7/1607—Armatures entering the winding
    • H01F7/1615—Armatures or stationary parts of magnetic circuit having permanent magnet
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/121—Guiding or setting position of armatures, e.g. retaining armatures in their end position
    • H01F7/122—Guiding or setting position of armatures, e.g. retaining armatures in their end position by permanent magnets

Definitions

  • the invention relates to an actuating magnet for a printing needle of a mosaic printer, in which a plunger armature connected to the printing needle is guided in the cylindrical interior of two soft-magnetic pole sleeves enclosed by a DC excitation winding, the spacing space of which is bridged by a spacing element, which consists of a material whose magnetic Conductivity is much smaller than that of the material of the pole sleeves.
  • the object of the invention is to increase the movement force exerted on the pressure needle.
  • the solution is achieved in that the spacing area between the ends of the yoke is bridged by a permanent magnet with its pole faces at the free ends of the yoke, and in that the direction of flow through the excitation coil generates a magnetic flux which opposes the flux driven by the permanent magnet through the yoke is.
  • the permanent magnet has the effect that the ratio of the magnetic flux density Bj in the soft magnetic yoke to the flux density B determining the tightening force in the air gap area to the soft magnetic armature is reduced. With unchanged yoke dimensions, the saturation of the soft magnetic material is then lower, so that the required air gap flow can be achieved with less excitation flow. Conversely, there are larger air gap inductions and thus greater pull-in forces if the pathogen flow is maintained.
  • Such magnets have a high energy density (product of coercive force and remanent induction) and a small reversible permeability.
  • Such magnets act almost like air for the flow generated by electrical excitation. The best effect results if the pole faces of the permanent bear directly on the free ends of the yoke, but an advantageous effect in the sense of the invention occurs even if the spacing gaps are not too large.
  • the invention results in particularly small and highly utilized plunger arm magnets, which allow high forces and rapid needle movements with small dimensions.
  • a pulling force is exerted on a soft magnetic armature 12 by pole sleeves 6 and 7 connected to a U-shaped soft magnetic yoke 13 when an excitation coil 14 is excited with direct current.
  • the space between the pole sleeves 6 and 7 is bridged by an annular permanent magnet 17. This drives a magnetic flux 7 essentially only through the yoke 13, since its magnetic resistance Rj is much smaller than that of the path via the armature 12.
  • measures for maintaining a minimum air gap can be provided in a manner known per se.
  • the flux generated by the excitation of the excitation coil 14 essentially flows only via the armature 12, since the magnetic resistance R ⁇ via this path is very much smaller than the magnetic resistance R m of the path via the permanent magnet 17, whose reversible permeability when using ceramic magnets , especially for rare earth magnets.
  • the magnetic flux generated by the excitation coil 14 in the yoke 13 is opposite to the flux generated by the permanent magnet 17.
  • FIG. 2 shows a simplified magnetic equivalent circuit diagram, in which Ve the electrical flux through the excitation coil 14 and Vm mean the coercive force or the permanent magnetic flux.
  • the magnitude of the magnetic resistance R is, in particular at low excitation currents through the excitation coil 14, a multiple of the value Rj.Rm is again many times greater than R, so that it can be approximately assumed that the electrically generated flux in the fully extended arrow direction 9 is only via the armature 12 and the permanent magnetic flux in the dashed arrow direction 10 runs only over the yoke 13.
  • the magnetic flux over the armature 12 and thus the force effect depends in the first approximation only on the electrically generated flux, while the flux density in the yoke is proportional to the difference between the electrical and permanent magnetic fluxes and therefore relatively low, so that to produce the predetermined one Flow over the armature 12 less excitation power is required because the state of saturation of the yoke 13 is reduced.
  • the plunger anchor design shown in FIG. 1 serves to actuate the printing needle 11 of a dot matrix printer, which is firmly connected to the plunger anchor 12.
  • the plunger armature 12 and thus the pressure needle 11 are moved downward against the force of the spring 18.
  • the figure shows the starting position in which the plunger anchor 12 is pressed against the stop 19 by the spring 18.
  • FIG. 3 shows associated characteristic curves of the force F exerted on the diving anchor 12 in the direction of the pressure needle 11 as a function of the anchor position h in the range of approximately ⁇ 0.5 mm.
  • a negative stroke in FIG. 3 means the direction of movement downwards.
  • the extended characteristic curves 20, 21 and 22 were determined with a permanent magnet, while the dashed curve 23, 24 and 25 were determined without a permanent magnet.
  • the invention can serve to achieve one or more of the following effects: Higher values for - magnetic force; - electro-mechanical efficiency; - maximum repetition frequency of the armature movement. Lower values for - Warming; - Weight; - Dimensions.
  • the ring cross section of the permanent magnet 17 may be larger or smaller than the adjacent ring surfaces 15 and / or 16 of the pole sleeves 6 and 7, respectively.
  • the space between the pole sleeves 6 and 7 is only filled in the radially outer region by the ring-shaped permanent magnet 17, while a layer 8 of a non-magnetic material is provided coaxially within the permanent magnet 17 relative to the cylindrical sliding surface of the armature 12 Machinability corresponds to that of the soft magnetic material of the pole sleeves 6 and 7.
  • An austenitic steel is particularly suitable for the layer 8. Then the inner machining of the pole sleeves 6 and 7 can be carried out continuously without a disruption caused by the hard material of the permanent magnets 17 interfering.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnets (AREA)
  • Impact Printers (AREA)
EP87201528A 1986-08-14 1987-08-12 Aimant d'actionnement pour une aiguille d'impression d'une imprimante à mosaique Withdrawn EP0260732A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863627648 DE3627648A1 (de) 1986-08-14 1986-08-14 Gleichstrommagnet
DE3627648 1986-08-14

Publications (1)

Publication Number Publication Date
EP0260732A1 true EP0260732A1 (fr) 1988-03-23

Family

ID=6307415

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87201528A Withdrawn EP0260732A1 (fr) 1986-08-14 1987-08-12 Aimant d'actionnement pour une aiguille d'impression d'une imprimante à mosaique

Country Status (4)

Country Link
US (1) US5071267A (fr)
EP (1) EP0260732A1 (fr)
JP (1) JPS6349443A (fr)
DE (1) DE3627648A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4442190A1 (de) * 1994-11-28 1996-05-30 Binder Magnete Einfachhubmagnet
DE102010014072A1 (de) * 2010-04-07 2011-10-13 Hydac Fluidtechnik Gmbh Betätigungsvorrichtung

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011053023A1 (de) * 2011-08-26 2013-02-28 Hilite Germany Gmbh Hydraulisches Getriebeventil
CN103606432B (zh) * 2013-11-27 2016-05-25 浙江科技学院 耐高压动磁式比例电磁铁
EP3261102A1 (fr) 2016-06-23 2017-12-27 Rain Bird Corporation Solénoïde universel
CN106812997A (zh) * 2017-01-23 2017-06-09 新开普电子股份有限公司 一种防强磁攻击的电磁阀推杆驱动机构
US10980120B2 (en) 2017-06-15 2021-04-13 Rain Bird Corporation Compact printed circuit board
US11503782B2 (en) 2018-04-11 2022-11-22 Rain Bird Corporation Smart drip irrigation emitter
US11721465B2 (en) 2020-04-24 2023-08-08 Rain Bird Corporation Solenoid apparatus and methods of assembly

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3040217A (en) * 1959-08-10 1962-06-19 Clary Corp Electromagnetic actuator
US3633615A (en) * 1970-03-18 1972-01-11 Sun Oil Co Delaware Control system
DE2236586A1 (de) * 1972-07-26 1974-02-07 Dungs Karl Fa Konstruktion und verfahren zur herstellung einer einteiligen magnetschlusshuelse zur betaetigung von elektromagneten, insbesondere zur anwendung bei magnetventilen
DE2742987A1 (de) * 1977-09-22 1979-04-12 Elmeg Elektromagnetische antriebsvorrichtung, insbesondere fuer eine werkzeugmaschine
US4235153A (en) * 1978-11-02 1980-11-25 General Electric Company Linear motion, electromagnetic force motor
DE3241254A1 (de) * 1981-11-16 1983-05-19 Moog Inc Elektromechanisches stellglied
DE3207912A1 (de) * 1982-03-05 1983-09-15 Bosch Gmbh Robert Magnetischer linearantrieb
EP0101527A1 (fr) * 1982-08-20 1984-02-29 Bürkert GmbH Soupape magnétique à impulsion avec verrouillage magnétique permanent sans changement d'aimantation
DE3239345A1 (de) * 1982-10-23 1984-04-26 bso Steuerungstechnik GmbH, 6603 Sulzbach Betaetigungsmagnet
EP0174238A2 (fr) * 1984-08-20 1986-03-12 Telemecanique Electro-aimant polarisé à fonctionnement bi- ou monostable

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2119415B2 (de) * 1971-04-21 1975-09-25 Nixdorf Computer Ag, 4790 Paderborn Elektromagnetischer Antrieb für die Nadel eines Nadeldruckers
DE2509917C3 (de) * 1975-03-07 1978-10-26 Philips Patentverwaltung Gmbh, 2000 Hamburg Elektromagnet
DE2527186C3 (de) * 1975-06-18 1980-10-09 Philips Patentverwaltung Gmbh, 2000 Hamburg Mosaikdrucker mit einem zylindrischen Gehäuse
DE2746601C2 (de) * 1977-10-15 1982-09-30 Philips Patentverwaltung Gmbh, 2000 Hamburg Klemmvorrichtung zum Verbinden einer Drucknadel mit einem hülsenförmigen Magnetanker
US4259653A (en) * 1977-11-22 1981-03-31 Magnetic Laboratories, Inc. Electromagnetic reciprocating linear actuator with permanent magnet armature
EP0018352B1 (fr) * 1979-04-05 1984-08-01 Motor Magnetics Inc. Dispositif ou machine électrique

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3040217A (en) * 1959-08-10 1962-06-19 Clary Corp Electromagnetic actuator
US3633615A (en) * 1970-03-18 1972-01-11 Sun Oil Co Delaware Control system
DE2236586A1 (de) * 1972-07-26 1974-02-07 Dungs Karl Fa Konstruktion und verfahren zur herstellung einer einteiligen magnetschlusshuelse zur betaetigung von elektromagneten, insbesondere zur anwendung bei magnetventilen
DE2742987A1 (de) * 1977-09-22 1979-04-12 Elmeg Elektromagnetische antriebsvorrichtung, insbesondere fuer eine werkzeugmaschine
US4235153A (en) * 1978-11-02 1980-11-25 General Electric Company Linear motion, electromagnetic force motor
DE3241254A1 (de) * 1981-11-16 1983-05-19 Moog Inc Elektromechanisches stellglied
DE3207912A1 (de) * 1982-03-05 1983-09-15 Bosch Gmbh Robert Magnetischer linearantrieb
EP0101527A1 (fr) * 1982-08-20 1984-02-29 Bürkert GmbH Soupape magnétique à impulsion avec verrouillage magnétique permanent sans changement d'aimantation
DE3239345A1 (de) * 1982-10-23 1984-04-26 bso Steuerungstechnik GmbH, 6603 Sulzbach Betaetigungsmagnet
EP0174238A2 (fr) * 1984-08-20 1986-03-12 Telemecanique Electro-aimant polarisé à fonctionnement bi- ou monostable

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4442190A1 (de) * 1994-11-28 1996-05-30 Binder Magnete Einfachhubmagnet
DE102010014072A1 (de) * 2010-04-07 2011-10-13 Hydac Fluidtechnik Gmbh Betätigungsvorrichtung

Also Published As

Publication number Publication date
US5071267A (en) 1991-12-10
DE3627648A1 (de) 1988-02-18
JPS6349443A (ja) 1988-03-02

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Inventor name: ALDEFELD, BERND, DR.