EP0401881B1 - Tête d'impression à aiguilles avec électro-aimants d'actionnement et de retour à armature battante - Google Patents

Tête d'impression à aiguilles avec électro-aimants d'actionnement et de retour à armature battante Download PDF

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Publication number
EP0401881B1
EP0401881B1 EP90115152A EP90115152A EP0401881B1 EP 0401881 B1 EP0401881 B1 EP 0401881B1 EP 90115152 A EP90115152 A EP 90115152A EP 90115152 A EP90115152 A EP 90115152A EP 0401881 B1 EP0401881 B1 EP 0401881B1
Authority
EP
European Patent Office
Prior art keywords
armature
hinged
needle
magnet
magnets
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
EP90115152A
Other languages
German (de)
English (en)
Other versions
EP0401881A3 (fr
EP0401881A2 (fr
Inventor
Jürgen Hilkenmeier
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.)
Wincor Nixdorf International GmbH
Original Assignee
Wincor Nixdorf International GmbH
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
Priority claimed from DE19873715304 external-priority patent/DE3715304A1/de
Application filed by Wincor Nixdorf International GmbH filed Critical Wincor Nixdorf International GmbH
Priority to EP90115152A priority Critical patent/EP0401881B1/fr
Priority to AT90115152T priority patent/ATE94470T1/de
Publication of EP0401881A2 publication Critical patent/EP0401881A2/fr
Publication of EP0401881A3 publication Critical patent/EP0401881A3/fr
Application granted granted Critical
Publication of EP0401881B1 publication Critical patent/EP0401881B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • B41J9/16—Means for cocking or resetting hammers
    • B41J9/24—Electromagnetic means

Definitions

  • the invention relates to an electromagnetic drive for the printing needle of a wire print head, with a folding armature magnet, the folding arm of which acts with its free end on the printing needle and can be moved into its rest position by means of a reset arrangement.
  • a needle printhead the armature of which is made from a ferromagnetic part by turning and milling, is known.
  • the anchor ends lie in one plane; however, these are only leveled by turning and not by lapping, since a protruding retaining edge is provided with a bearing groove for the anchor, which does not permit any other processing. Since the armature rests on the middle yoke, the air gap results from the distance between the cover contact surface and the armature end face, the thickness of the stop and the thickness of the armature. He is u. a. dependent on the rotational accuracy of the end face and the support surface.
  • DE 31 49 300 A1 discloses a magnetic system of a wire dot print head, in which the pole faces are flat and an armature holder surface and an armature surface without an air gap are arranged in the same plane.
  • An air gap is therefore not available as an intermediate energy store; the pressure energy comes from a spring, which entails considerable tolerances.
  • the retraction speed is completely undefined.
  • the reset arrangement is a second hinged armature magnet, the hinged armature of which is identical to that of the first and the magnetic yoke is arranged on the side of the hinged armature facing away from the magnetic yoke of the first hinged armature magnet.
  • a particularly advantageous embodiment enables a high working speed with a simple construction and simple manufacture, the windings of the magnets being connectable to a control device which energizes the reset electromagnets only when the mirror-image-tightening electromagnet is not energized.
  • the pole faces of the two magnet yokes are preferably aligned with one another and the magnet yokes are of identical design.
  • the working magnet only needs to set the armature and the needle in motion when the return magnet is deenergized and bring in the energy required for printing; there is no tensioning of a return spring, so that with the same dimensioning of the components and otherwise corresponding operating conditions, a printing speed which is about 30% higher than that of a version with a return spring is achieved.
  • the arrangement of the return magnets is preferably a mirror image of the pull-in magnets, with the longitudinal center plane of the hinged armature as the plane of mirror symmetry.
  • Fig. 1 shows about 5 times enlarged a cross-section through a needle printhead from the central axis (M) in the radial direction with a light metal body (1) in which a magnet yoke (3) carrying a winding (4) is cast.
  • the magnetic yoke (3) is inserted into a recess in the base plate (2).
  • the base plate (2) which is used for the complete assembly of the tightening magnets with the windings (4) and the electrical connections, is held in one turn (12) centrally in the metal block (1).
  • the segment-shaped recesses (42) in the light metal body (1) are filled with casting compound, via which the heat is removed from the windings (4) of the magnets.
  • cooling ribs (17) are integrally formed on the outside of the light metal body (1), and the webs between the magnets serve to absorb heat.
  • the potting compound is selected with high heat conduction, for which purpose.
  • B. serve as filler metal particles.
  • the end face (S1) of the light metal body (1) and the pole faces (S2) of the magnet yokes (3) are ground together.
  • Spacers (70, 71, 71A) are arranged on the end face (S1), in which the hinged armature (5) is pivotably mounted, on the end of which extends to the center of the head, a pressure needle (51) is attached, which is arranged in web-shaped needle guides (61) are slidably mounted towards the pressure mouthpiece, not shown.
  • the needle guides (61) are held in a known manner in a housing (6) which is fastened to the light metal body (1) with screws (62) in cylindrical grooves (18).
  • the pivoting movement of the armature (5) is limited by the stop surface, which is just ground over with the contact surface (S1A) of the stop body on the spacer (71A, 70, 71).
  • the air gap (SP) of the hinged armature magnet thus results from the difference between the total thickness (D) of the spacer and the armature thickness.
  • a restoring electromagnet (3A, 4A) is arranged on the armature (5) as a restoring means for the armature (5).
  • a spring (15) and / or a permanent magnet (15M) can be inserted into cylindrical openings in the light metal body (1, 1A).
  • the return electromagnets (3A, 4A) are each arranged symmetrically with respect to the armatures (5) as a mirror image of the tightening electromagnets (3, 4), whereby they are also fixed in a base plate (2A) and cast in a light metal body (1A) .
  • the pole faces of the return magnets (3A) form the stop faces (S2A).
  • the two base plates (2, 2A) are closed off by cover plates (41, 41A).
  • Fig. 2 shows a circuit arrangement for controlling the windings of a pull-in magnet and a return magnet (4, 4A).
  • the operating voltage (U) is fed to a controllable current source (IQ), which expediently contains a pulse pause control (PP) and a freewheeling circuit (FD), the output (I) of which via controllable switches (RS, AS) to the winding (4A) of the reset magnet or the winding (4) of the control magnet is switched.
  • IQ controllable current source
  • PP pulse pause control
  • FD freewheeling circuit
  • a central pressure control (ZS) sends a control signal (A) to the switch (AS) for a given triggering time, which is determined depending on the desired stroke strength and the available print material, and the pressure control (ZS) determines the pressure at the same time Current strength of the current source (IQ) via the current control signal (IS).
  • the switch (RS) is opened via a correspondingly polarized signal (R) and the reset and holding magnet (4A) is released.
  • the control signal (A) is switched off and the reset magnet current is switched on with the control signal (R).
  • the current strength is advantageously chosen to be approximately the same size as during propulsion, so that approximately the same initial magnetic field strength is built up in the air gap, which causes the armature to change direction quickly. Thereafter, a much lower current is specified by changing the current control signal (IS), whereby the Stop the armature not a strong rebound but a hold, so that the needle can be operated again immediately or at any predetermined time without waiting.
  • IS current control signal
  • the energy of a winding (4, 4A) that has just been switched off is transferred to the winding that is switched on at the same time and actuates the same armature, thereby significantly accelerating the current build-up or reduction.
  • transfer diodes (D3, D4) mutually form a series connection of these windings, the blocking diodes (D1, D2) effecting their mutual decoupling.
  • the flooding during the tightening time is expediently about 1: 3 of the suit flow.
  • the flow is then reduced to a holding flow of approximately 2% of the value of the suit flow.
  • An advantageous energy-saving energization of the restoring magnets (3A, 4A) results in each case by utilizing the rebound energy of the printing needles (51) and the armature (5), in that after switching off the energization, which occurs, for example, in the event of a needle impact, there is a waiting time without energization, which lasts until for complete anchor reversal, e.g. B. 10 to 20 microseconds, after which the energization of the restoring magnets (3A, 4A) takes place with 1/3 to 1/10 times the suit flow and until the armature (5) strikes the stop and there has given off its rebound energy, which takes about 3/2 to 1 times the tightening time. The current is then switched down to the holding current of approx.
  • the specified work areas relate to printing up to five uses and more than five uses.
  • the appropriate values are specified. Preferably, the default values can be changed between two operating states in a switchable manner. If there are more than five uses, the maximum suit flow is used, and if there are fewer than five uses, the suit flow is reduced from 3/4 of this maximum value.
  • FIG. 3 and 4 show the spacer plates (70, 71) which have segment-shaped extensions, between which the anchors are arranged in cutouts (75, 72).
  • the laterally enlarged cutouts (76) serve to accommodate the pivot pin.
  • the bores (73, 74) serve for pinning with the metal bodies.
  • Fig. 5 shows an anchor (5), which is composed of sheets (53), of which the middle sheet (53M) is extended to the needle (51).
  • the pivot bearing journal (52) is fastened in a groove (54) on the rear anchor end.
  • the thickness of the armature (5) is tapered in accordance with the swivel angle, so that it has a minimal final air gap over its length in both swivel directions, which results in a good use of energy and a low holding flow.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Impact Printers (AREA)

Claims (7)

  1. Dispositif d'entraînement électromagnétique pour les aiguilles d'impression (51) d'une tête d'impression à aiguilles, comportant un aimant (3,5) à armature battante, dont l'armature battante (5) agit, par son extrémité libre, sur les aiguilles d'impression (51) et peut être amenée dans sa position de repos au moyen d'un dispositif de rappel, caractérisé par le fait que le dispositif de rappel est un second aimant à armature battante (3A,5), dont l'armature battante (5) est identique à celle du premier aimant et dont la culasse magnétique (3A) est disposée sur le côté de l'armature battante (5), tourné à l'opposé de la culasse magnétique (3) du premier aimant à armature battante (3,5).
  2. Dispositif d'entraînement électromagnétique suivant la revendication 1, caractérisé par le fait que les enroulements d'excitation (4,4A) des deux aimants à armature battante (3,3A) sont alimentés alternativement en courant par un dispositif de commande.
  3. Dispositif d'entraînement électromagnétique suivant la revendication 1 ou 2, caractérisé par le fait que les surfaces polaires (S2,S2A) des deux culasses magnétiques (3,3A) sont tournées l'une vers l'autre.
  4. Dispositif d'entraînement électromagnétique suivant la revendication 3, caractérisé par le fait que les deux culasses magnétiques (3,3A) sont identiques.
  5. Dispositif d'entraînement électromagnétique suivant l'une des revendications précédentes, caractérisé par le fait que le plan médian longitudinal de l'armature battante est un plan de symétrie pour les deux aimants à armature battante (4,4A).
  6. Tête d'impression à aiguille comportant plusieurs dispositifs d'entraînement électromagnétiques disposés autour d'un faisceau d'aiguilles d'impression, suivant l'une des revendications précédentes, caractérisée par le fait que les dispositifs d'entraînement sont disposés entre deux plaques de base parallèles (2,2A), dont la distance est prédéterminée par des entretoises (1,1A,70,71,71A).
  7. Tête d'impression à aiguilles suivant la revendication 6, comportant des dispositifs d'entraînement suivant les revendications 3 et 4, caractérisée par le fait que les deux plaques de base (2,2A) sont identiques.
EP90115152A 1987-05-08 1988-05-07 Tête d'impression à aiguilles avec électro-aimants d'actionnement et de retour à armature battante Expired - Lifetime EP0401881B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP90115152A EP0401881B1 (fr) 1987-05-08 1988-05-07 Tête d'impression à aiguilles avec électro-aimants d'actionnement et de retour à armature battante
AT90115152T ATE94470T1 (de) 1987-05-08 1988-05-07 Nadeldruckkopf mit antriebs- und rueckholklappankermagneten.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19873715304 DE3715304A1 (de) 1987-05-08 1987-05-08 Nadeldruckkopf mit klappankermagneten und ansteuerverfahren dafuer
DE3715304 1987-05-08
EP90115152A EP0401881B1 (fr) 1987-05-08 1988-05-07 Tête d'impression à aiguilles avec électro-aimants d'actionnement et de retour à armature battante

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP88107413.2 Division 1988-05-07
EP88107413A Division EP0293638B1 (fr) 1987-05-08 1988-05-07 Tête d'impression à aiguilles avec électro-aimants à armature battante

Publications (3)

Publication Number Publication Date
EP0401881A2 EP0401881A2 (fr) 1990-12-12
EP0401881A3 EP0401881A3 (fr) 1991-02-06
EP0401881B1 true EP0401881B1 (fr) 1993-09-15

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ID=25855335

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90115152A Expired - Lifetime EP0401881B1 (fr) 1987-05-08 1988-05-07 Tête d'impression à aiguilles avec électro-aimants d'actionnement et de retour à armature battante

Country Status (2)

Country Link
EP (1) EP0401881B1 (fr)
AT (1) ATE94470T1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7017183A (fr) * 1970-11-24 1972-05-26
US3741113A (en) * 1971-06-25 1973-06-26 Ibm High energy print hammer unit with fast settle out
NL7510968A (nl) * 1974-09-27 1976-03-30 Bell Telephone Mfg Drukkop.
US4522122A (en) * 1983-05-03 1985-06-11 Ncr Canada Ltd - Ncr Canada Ltee Fast impact hammer for high speed printer

Also Published As

Publication number Publication date
EP0401881A3 (fr) 1991-02-06
ATE94470T1 (de) 1993-10-15
EP0401881A2 (fr) 1990-12-12

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