EP0027894B1 - Electro-aimant à armature battante - Google Patents

Electro-aimant à armature battante Download PDF

Info

Publication number
EP0027894B1
EP0027894B1 EP80105724A EP80105724A EP0027894B1 EP 0027894 B1 EP0027894 B1 EP 0027894B1 EP 80105724 A EP80105724 A EP 80105724A EP 80105724 A EP80105724 A EP 80105724A EP 0027894 B1 EP0027894 B1 EP 0027894B1
Authority
EP
European Patent Office
Prior art keywords
hinged armature
magnet
yoke
hinged
mounting part
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
EP80105724A
Other languages
German (de)
English (en)
Other versions
EP0027894A3 (en
EP0027894A2 (fr
Inventor
Hans-Werner Volke
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.)
Siemens Nixdorf Informationssysteme GmbH
Original Assignee
Wincor Nixdorf International GmbH
Nixdorf Computer 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 Wincor Nixdorf International GmbH, Nixdorf Computer AG filed Critical Wincor Nixdorf International GmbH
Publication of EP0027894A2 publication Critical patent/EP0027894A2/fr
Publication of EP0027894A3 publication Critical patent/EP0027894A3/de
Application granted granted Critical
Publication of EP0027894B1 publication Critical patent/EP0027894B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/18—Movable parts of magnetic circuits, e.g. armature
    • H01H50/24—Parts rotatable or rockable outside coil
    • H01H50/26—Parts movable about a knife edge
    • 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
    • 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
    • H01F7/13—Electromagnets; Actuators including electromagnets with armatures characterised by pulling-force characteristics
    • 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
    • H01F7/14—Pivoting armatures

Definitions

  • the invention relates to a hinged armature magnet for a mosaic printhead with a hinged armature which carries a pressure needle at its free end and is pivotally held at its other end by means of a mounting part on a leg of the magnetic yoke against spring force, the pivoting path being limited by a stop.
  • Such a hinged armature magnet is known for example from DE-A-2 717 077.
  • the hinged anchor rests with its clamped end directly on the end face of the leg of the magnetic yoke near the mounting part, a pivot axis of the hinged anchor being determined in that the corner edge of the end face of the yoke leg near the mounting part is chamfered. This creates a tipping edge around which the hinged anchor swings.
  • the invention has for its object to provide a hinged armature of the type mentioned a storage for the hinged armature, which is easy and inexpensive to manufacture and in which the position of the pivot axis of the hinged armature can be maintained exactly.
  • the hinged armature abuts near its end held by the mounting part and the mounting part jointly abuts an essentially cylindrical pin which is arranged with its cylinder axis essentially parallel to the pivot axis of the hinged anchor in the region of the corner edge of the magnet yoke near this pivot axis and that the mounting part is biased towards the adjacent yoke leg.
  • a cylindrical pin can be manufactured in a simple manner at low manufacturing costs with high precision, for example from steel. Since both the hinged anchor and the mounting part lie together on the same pin, the length of the lever arm between the point of application of the mounting part and the contact line of the hinged anchor on the pin is precisely defined. This length varies during the pivoting movement of the hinged anchor in a precisely defined manner such that the lever arm between the point of application of the mounting part and the support line of the hinged anchor on the pin and thus also the torque to be overcome by the magnetic force in the open position of the hinged anchor is less than in its closed position, in which it is held by the magnetic force on the magnetic yoke.
  • one leg of a U-shaped spring clip that at least partially encompasses the magnetic yoke is formed, the other leg of which carries a guide part for the free end of the hinged armature, the legs of the spring clip opposite the magnetic yoke are resiliently movable.
  • other spring means can also be provided which exert the required restoring force on the mounting part.
  • the end face of the yoke leg facing the hinged anchor forms the tangent plane to the pin.
  • the pin is arranged in a recess in the yoke leg in such a way that its surface protrudes slightly above the surface of the yoke leg facing the folding anchor or the mounting part. This ensures that the hinged anchor and the mounting part each have line contact with the pin.
  • the protrusion of the pin surface over the end face of the yoke leg facing the hinged anchor should be so small that the hinged anchor lies essentially flat on the end face of the yoke leg in its tightened position.
  • the pin expediently has on its surface a recess intended to engage the recess in the yoke leg, the axial extent of which is substantially equal to the width of the yoke leg measured in the axial direction.
  • the assembly of the pin on the magnetic yoke is considerably simplified if the assembly part is prestressed in the direction of the yoke leg adjacent to it. As a result, the mounting part rests under spring tension on the pin surface and holds the pin in the recess of the yoke leg.
  • the assembly part is arranged on a U-leg of a U-shaped spring clip, the previously required guidance of the U-leg of the spring clip in grooves which were formed parallel to the longitudinal direction of the yoke leg adjacent to the U-leg is also eliminated.
  • the folding armature magnet shown in FIGS. 1 to 3 and generally designated 10 essentially comprises a U-shaped magnet yoke 12 made of sintered metal with two yoke legs 14 and 16, of which the yoke leg designated 16 has a magnet coil 18 with feed lines 20, 22 carries, a sintered metal folding anchor 24, which carries a pressure needle 26 at a free end, a U-shaped spring yoke 28 enclosing the magnetic yoke 12 and finally a spring 32 fastened to a free resilient first U-leg 30 of the spring yoke 28 by means of a screw 32 , made of shock-absorbing plastic guide part 34.
  • the screw 32 engages through an elongated hole 36 in the guide part and into a threaded bore 38 of the first U-leg 30 of the spring clip 28. Because of the elongated hole 36, the guide part 34 can be parallel to the first U-leg 30 shifted and in its respective position. can be locked by means of the screw 32.
  • the guide part 34 has an opening 40 in its upper part, through which the hinged anchor 24 projects with its free end, a stop piece 42 inserted in the upper part of the opening, which also extends from. Plastic consists and is glued to the guide part 34, for example, serves as a stroke limitation of the hinged armature 24.
  • the first U-leg 30 of the spring clip 28 is fork-shaped at its free end (cf. FIGS. 1 and 3), the hinged anchor 24 reaching through between the fork ends 44.
  • the guide member 34 ensures very good rebound damping for the hinged armature 24 by its elastically resilient mounting on the spring clip 28 and enables adjustment of the stroke of the hinged armature 24.
  • the spring clip 28 has a longitudinal slot 50 (FIG. 2) in the area of its U-cross leg and in each case in an adjacent part of the first U-leg 30 and the second U-leg 48 narrow web 52 (Fig. 1) is interrupted.
  • the Magentjoch 12 has on its side distant from the hinged armature 24 a step 54, in which the web 52 engages in such a way that its outer surface is flush with the outer surface of the magnetic yoke 12.
  • the magnetic yoke 12 engages in the slot 50 shown in FIG. 1.
  • the spring clip 28 is held on the magnetic yoke 12 by a nut 56 which is screwed onto a threaded pin 58 which is formed in one piece with the magnetic yoke 12 and extends in the opposite direction to the central yoke leg 16.
  • the entire hinged armature magnet 10 can be inserted into a bore 60 of a print head carrier 62 and locked by means of a nut 64.
  • the bore 60 has a larger-diameter section 66 near the hinged armature magnet 10, in which a compression spring 68 is arranged, which is supported on the one hand on a shoulder 70 of the bore 60, 66 and on the other hand on the nut 56 or the underside of the hinged armature magnet 10.
  • this compression spring the hinged armature magnet 10 can be adjusted in height relative to the print head carrier 62.
  • the hinged armature magnet 10 is secured against lateral rotation relative to the print head carrier 62 by lateral stops 72 on the surface of the print head carrier 62.
  • the second U-leg 48 of the spring clip 28 has an opening 74 near its free end, through which the hinged armature 24 engages with its end remote from the pressure needle 26.
  • a bearing tongue 76 of the U-leg 48 which engages in a recess 78 on the hinged armature 24 with spring tension and thus presses the end of the hinged armature 24 against a cylindrical bearing pin 80, which in a step-shaped recess 82 on the U - Leg 48 facing the upper corner edge of the yoke leg 14 is inserted.
  • the bearing pin 80 has a recess or notch 84 (FIG. 1), the axial dimension of which is equal to the thickness of the magnetic yoke 12, so. that the bearing pin 80 is axially immovable on the magnetic yoke 12.
  • the bearing pin 80 protrudes slightly with its surface over the surface of the magnetic yoke 12 facing the U-leg 48 of the spring clip 28 and over the end face of the yoke leg 14 facing the folding armature 24, so that a line contact between the bearing pin 80 and the U-leg 48 or the hinged anchor 24 is ensured.
  • the protrusion of the bearing pin 80 over the end face facing the hinged anchor 24 is so small that the air gap between the. End face of the yoke leg 14 and the hinged armature 24 for the magnetic flux is not important.
  • the U-leg 48 is in the direction biased on the magnetic yoke 12 so that it bears against the bearing pin 80 under this bias.
  • the hinged anchor 24 rolls off the surface of the pivot pin 80, the distance between the line of contact of the hinged anchor 24 with the surface of the pivot pin 80 and the abutment formed by the bearing tongue 76 being precisely defined in each position of the hinged anchor 24 .
  • the restoring moment with which the spring clip 28 acts on the hinged anchor 24 and which must be overcome by the magnet for pivoting the hinged anchor 24 is precisely defined in every position of the hinged anchor 24.
  • the restoring element is smaller in the open position of the hinged armature 24 because of the then shorter lever arm than in the closed position of the hinged armature 24.
  • bearing pins 80 can be manufactured very precisely in a simple and inexpensive manner, folding armature magnets can now be produced with little effort, in which the previously usual manufacturing accuracies in the region of the bearing point of the folding armature 24 become practically negligible.
  • FIG. 1 When the magnetic coil 18 is energized, a magnetic force flow is generated in the magnetic yoke 12, which closes via the hinged armature 24.
  • the hinged armature 24 is thereby pulled against the magnetic yoke 12 from the position shown in FIG. 1.
  • the spring clip 28 is stressed by the tilting of the hinged armature 24 around the bearing pin 80, which is counteracted by a spring force which results in particular from the curved sections of the spring clip 28 which delimit the slot 50 and are shown in FIGS. 1 and 2, which according to Fig. 2 have a distance from the magnetic yoke 12 and thus can perform a spring movement with respect to the lower horizontal part of the spring clip 28.
  • the spring clip 28 is thereby shifted slightly laterally on the magnetic yoke 12 in its longitudinal direction.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Impact Printers (AREA)
  • Electromagnets (AREA)

Claims (4)

1. Aimant à armature battante destiné à une tête d'impression matricielle et comportant une armature battante (24) qui porte à son extrémité libre une aiguille d'impression (26) et est maintenue à son autre extrémité au moyen d'un organe de montage (48) contre une branche de la culasse d'aimant (12) de façon à pouvoir basculer contre la force d'un ressort, le parcours de basculement étant limité par une butée (42), caractérisé en ce que l'armature battante (24) à proximité de son extrémité maintenue par l'organe de montage (48) et l'organe de montage (48) prennent appui ensemble contre une cheville sensiblement cylindrique (80) qui a son axe disposé sensiblement parallèlement à l'axe de basculement de l'armature battante (24) au niveau de l'angle de la culasse d'aimant (12) situé à proximité de cet axe de basculement et en ce que l'organe de montage (48) est soumis à une tension initiale le sollicitant en direction de la branche de culasse (14) voisine de lui.
2. Aimant à armature battante selon la revendication 1, caractérisé en ce que, la culasse d'aimant (12) étant réalisée en forme d'U, l'organe de montage (48) est formé sur une branche d'un étrier élastique (28) en U qui entoure la culasse d'aimant (12) au moins partiellement et dont l'autre branche porte un organe de guidage (34) pour l'extrémité libre de l'armature battante (24), lequel organe comporte la butée, les branches de l'étrier élastique (28) étant élastiquement mobiles par rapport à la culasse (12) de l'aimant.
3. Aimant à armature battante selon la revendication 1 ou 2, caractérisé en ce que la cheville (80) est montée dans un évidement (82) de la branche (14) de la culasse de manière à faire saillie avec sa surface légèrement au-delà des plans limitant la culasse d'aimant (12) respectivement du côté de l'armature battante (24) et du côté de l'organe de montage (48).
4. Aimant à armature battante selon la revendication 3, caractérisé en ce que la cheville (80) présente dans sa surface un creux (84) destiné à venir en prise avec l'évidement (82) prévu dans la culasse (12), l'étendue axiale dudit creux étant sensiblement égale à la largeur de la culasse (12), mesurée en direction axiale.
EP80105724A 1979-10-26 1980-09-24 Electro-aimant à armature battante Expired EP0027894B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2943440 1979-10-26
DE2943440A DE2943440C2 (de) 1979-10-26 1979-10-26 Klappankermagnet

Publications (3)

Publication Number Publication Date
EP0027894A2 EP0027894A2 (fr) 1981-05-06
EP0027894A3 EP0027894A3 (en) 1981-11-25
EP0027894B1 true EP0027894B1 (fr) 1984-05-09

Family

ID=6084509

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80105724A Expired EP0027894B1 (fr) 1979-10-26 1980-09-24 Electro-aimant à armature battante

Country Status (3)

Country Link
US (1) US4338585A (fr)
EP (1) EP0027894B1 (fr)
DE (1) DE2943440C2 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2510810A1 (fr) * 1981-07-31 1983-02-04 Bernier Raymond Organe mecanique de maintien en contact, sur l'arete d'un couteau, d'une piece mobile oscillant librement autour de ladite arete, en vue de la commande d'un contact electrique et son application a la construction de relais ou interrupteurs
US4515251A (en) * 1983-01-26 1985-05-07 Warner Electric Brake & Clutch Company Electromagnetic brake with improved armature mounting
US4585361A (en) * 1984-02-16 1986-04-29 Dataproducts, Inc. Actuator for dot matrix printhead
DE3421874A1 (de) * 1984-06-13 1985-12-19 Brown, Boveri & Cie Ag, 6800 Mannheim Klappanker-lagerung
DE3502471A1 (de) * 1985-01-25 1986-07-31 Mannesmann AG, 4000 Düsseldorf Matrixdruckkopf
US4670727A (en) * 1985-07-18 1987-06-02 Siemens Aktiengesellschaft Electromagnetic relay
DE3675852D1 (de) * 1985-08-09 1991-01-10 Siemens Ag Elektromagnetisches relais.
US4818965A (en) * 1986-06-23 1989-04-04 Siemens Aktiengesellschaft Electromagnetic relay
US5002412A (en) * 1986-10-08 1991-03-26 Alps Electric Co., Ltd. Armature guide for wire dot print head
JPH0611789Y2 (ja) * 1987-04-20 1994-03-30 アルプス電気株式会社 ワイヤドツトプリンタ用ヘツド
DE19814399C1 (de) * 1998-03-31 1999-10-21 Moeller Gmbh Elektromagnetisches Schaltgerät
DE10009168A1 (de) * 2000-02-26 2001-09-13 Bosch Gmbh Robert Messvorrichtung und Verfahren zur Erfassung einer Kraft

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1048317B (fr) * 1959-01-08
US995255A (en) * 1908-08-01 1911-06-13 Kellogg Switchboard & Supply Electromagnet.
NL183132B (nl) * 1954-01-25 Greiner Kg Stapelbare sluithuls, alsmede combinatie van een magazijn gevuld met dergelijke sluithulzen.
DE2056364B2 (de) * 1970-11-17 1976-05-13 Offermann, Karl Heinz, 4322 Sprockhövel Elektromagnetsystem fuer mosaik- druckwerke
SE356149B (fr) * 1971-09-24 1973-05-14 Philips Svenska Ab
DE7421405U (de) * 1974-06-24 1974-09-26 Felten & Guilleaume Schaltanlagen Gmbh Magnetsystem für Klappankerrelais
US3991869A (en) * 1975-12-15 1976-11-16 General Electric Company Print head improvement
DE2717077C3 (de) * 1977-04-18 1980-10-23 Nixdorf Computer Ag, 4790 Paderborn Halterung für einen Klappankermagneten eines Mosaikdruckkopfes

Also Published As

Publication number Publication date
US4338585A (en) 1982-07-06
EP0027894A3 (en) 1981-11-25
EP0027894A2 (fr) 1981-05-06
DE2943440C2 (de) 1984-09-06
DE2943440A1 (de) 1981-05-07

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