EP0293638A1 - Tête d'impression à aiguilles avec électro-aimants à armature battante - Google Patents

Tête d'impression à aiguilles avec électro-aimants à armature battante Download PDF

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Publication number
EP0293638A1
EP0293638A1 EP88107413A EP88107413A EP0293638A1 EP 0293638 A1 EP0293638 A1 EP 0293638A1 EP 88107413 A EP88107413 A EP 88107413A EP 88107413 A EP88107413 A EP 88107413A EP 0293638 A1 EP0293638 A1 EP 0293638A1
Authority
EP
European Patent Office
Prior art keywords
armature
needle
flow
windings
suit
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.)
Granted
Application number
EP88107413A
Other languages
German (de)
English (en)
Other versions
EP0293638B1 (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.)
Protechno CES GmbH and Co KG
Original Assignee
Protechno CES GmbH and Co KG
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 Protechno CES GmbH and Co KG filed Critical Protechno CES GmbH and Co KG
Priority to AT88107413T priority Critical patent/ATE66868T1/de
Publication of EP0293638A1 publication Critical patent/EP0293638A1/fr
Application granted granted Critical
Publication of EP0293638B1 publication Critical patent/EP0293638B1/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
    • B41J2/235—Print head assemblies
    • 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 a needle print head with ring-shaped hinged armature magnets, the armatures of which are each connected to a pressure needle, which are guided by needle guides approximately in the middle of the magnet arrangement and on the armatures of which the armatures in the de-energized state are arranged counter to the direction of attraction of the hinged armature magnets Spend hinged armature magnets against a stop, so that between the armature and the in-plane pole faces of the hinged armature magnets there is an air gap of a predetermined size, which is determined by an armature thickness and a spacer in which the armatures are pivotally mounted and a stop body on the end faces , which has a flat anchor stop surface, is attached.
  • DE 22 01 049 B2 describes a wire dot print head whose armature is made of a ferromagnetic part is made by turning and milling.
  • the anchor ends lie in one plane; however, these are only leveled by turning and not by lapping, since a protruding retaining edge with a bearing groove is provided for the anchor. that does not allow 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. It is therefore dependent on one another, inter alia, 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 yokes of the hinged armature magnets are fastened in segment-shaped recesses of a metal body with potting compound and the pole faces lie in one plane with an end face of the metal body and the spacer is arranged on this end face, which is punched out and laminated from sheets of narrow thickness tolerance is, the sheets have inwardly extending segment-shaped cutouts for receiving the anchor and further cutouts are provided in the middle of the sheets for receiving it in the anchor-mounted pivot bearing journal, and that the stop body with the flat anchor stop surface is arranged on the spacer so that the air gap width is only determined by the anchor thickness and a thickness of the spacer.
  • the spacer is made from stamped and layered sheets, preferably from three sheets. In this case, enlarged cutouts are preferably punched into the middle of the layered sheets, which serve to receive a pivot bearing pin of the armature.
  • the hinged armature magnets are expediently mounted on a base plate with recesses, and the windings are then pushed on and soldered.
  • the light metal body is turned out to accommodate the coils and the base plate.
  • the potting compound is introduced and the end and pole faces are ground together, so that a defined reference area is provided for the spacer mounting.
  • the sheets of the spacer can be easily manufactured as stamped parts with a closely tolerated sheet thickness.
  • the anchors of a needle head are grasped and ground as a complete set before the bearing pins are inserted, so that only one grinding operation, namely the one relevant to the anchor thickness, results in all air gap widths, which thus have practically no difference between them.
  • the armature pole faces are radially tapered with respect to the pivot bearing, so that a flat contact is achieved on the pole faces as well as on the stop surface for the purpose of high damping and minimizing the remaining gap.
  • the end face of the stop body facing the anchor is also ground so that the air gap and thus the armature stroke is determined by the thickness of the spacer or the total thickness of its sheets less the anchor thickness.
  • This timing accuracy is all the more important the faster the character string and thus the head feed is selected, which, for example, is 200 characters per second for high-speed print heads; which corresponds to a feed rate of 50 cm / sec.
  • the exact temporal flight behavior of the needles and the resulting Good typeface with high character speed has the advantage that a high-resolution typeface with, for example, 24 or 36 needles with so-called "near letter quality" can be created at high speed with a corresponding number of anchors and needles.
  • a particularly advantageous embodiment enables a high working speed with a structure and simple manufacture, with the electromagnets with yokes and windings, the windings of which are fastened on the spacer in mirror image of the pull-up magnet as the restoring means and as the stop body on the same armature can be connected to the control device, which energizes these reset electromagnets only when the mirror-image electromagnet is not energized.
  • the spacer is made of three stamped and layered sheets to enable a simple construction with a tightly tolerated air gap.
  • enlarged cutouts are punched into the middle of the layered sheets, which serve to receive a pivot bearing pin of the armature.
  • the hinged armature magnets are expediently mounted on a base plate with recesses, and the windings are then pushed on and soldered.
  • the light metal body is turned out to accommodate the coils and the base plate.
  • the sealing compound is introduced and the end and pole surfaces are ground together, so that a defined reference surface is provided for the spacer assembly.
  • the sheets of the spacer can be easily manufactured as stamped parts with a closely tolerated sheet thickness.
  • the anchors of a needle head are gripped and ground as a complete set before the bearing pins are inserted, so that only one grinding operation, namely the one relevant to the anchor thickness, results in all air gap widths, which thus have practically no difference between them.
  • the armature pole faces are radially tapered with respect to the pivot bearing, so that a flat contact is achieved on the pole faces as well as on the stop surface for the purpose of high damping and minimizing the remaining gap.
  • the end face of the stop body facing the anchor is also ground so that the air gap and thus the armature stroke is determined by the thickness of the spacer or the total thickness of its sheets less the anchor thickness.
  • This timing accuracy is all the more important the faster the character string and thus the head feed is selected, which, for example, is 200 characters per second for high-speed print heads; which corresponds to a feed rate of 50 cm / sec. Because of the exact temporal flight behavior of the needles and the resulting good typeface at high character speed, there is the advantage that a high-resolution typeface with eg 24 or 36 needles with so-called "near letter quality" can be created at high speed with a corresponding number of anchors and needles .
  • the high-speed writing that can be achieved with narrow air gap tolerances and with spring return of the armature is increased in that a reset electromagnet is assigned to each pull-in magnet of the hinged armature instead of a spring as the restoring means.
  • 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 the return spring, so that with the same dimensioning of the components and otherwise corresponding operating conditions, a printing speed which is about 30% higher is achieved.
  • the arrangement of the return magnets is preferably a mirror image of the pull-in magnets, and their manufacture is correspondingly simple.
  • the pole faces of the reset magnets serve as a stop for the armature in the idle state. Since less power is required for the reset; because the impact energy of the needles, which is not consumed during the printing process, causes the needles to rebound; the return magnet can also be provided with shorter legs and smaller coils. To hold the returned armature, only a relatively small flow of about 2% of the suiting flow is required, since the remaining gap is very narrow, so that only very small losses occur in the windings when holding, which are known to be quadratically dependent on the flow, i.e. approximately 0.5 per mille.
  • a spring or a permanent magnet on the drive or reset side of the armature, which forms a reset or holding aid or a drive aid.
  • the non-linear polar force characteristic of a reset magnet can be fully exploit without special effort that the pole faces of the permanent magnet are machined together with the pole faces of the electromagnet during the grinding process and thus a flat contact of the armature is achieved.
  • a practically stress-free and torsion-free mounting of the armature in relation to the magnetic poles and the pressure needle is advantageously achieved in that the needles and / or the pivot bearing bolts are welded to the armature in situ, for which purpose preferably laser or electron beam welding is used.
  • these electromagnets are advantageously excited by pulsating current before the welding and are subjected to a continuous current during the welding.
  • Fig. 1 shows a 5-fold enlarged 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 from the windings (4) of the magnet is dissipated.
  • Cooling fins (17) are integrally formed, and the webs between the magnets serve to absorb heat.
  • the casting compound is selected with high heat conduction, for which purpose metal particles are used, for example, as filling material.
  • the end face (S1) of the light metal body (1) and the pole faces (S2) of the Manget yokes (3) are ground together.
  • Spacers (70, 71, 71A) are arranged on the end face (S1), in which the hinged anchor (5) is pivotably mounted, on the end of which extends to the center of the head, a pressure needle (51) is fastened, 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 anchors (5) bear against the ribbed stop body (30) at the rear.
  • 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 compression spring (15) is arranged on the armature (5) as a return means for the armature (5).
  • the springs (15) are inserted into cylindrical openings in the light metal body (1).
  • FIGS. 2-7 Further details of the structure are shown in about 2 times magnification in FIGS. 2-7.
  • a light metal body (1) is shown in FIG. 2 in axial cross section and in detail in FIG Face.
  • the extruded profile has segment-shaped recesses (14) for 24 magnets, which are extended by a recess (11) in the area of the windings.
  • the cylindrical recesses (15Z) for the return spring or the return magnet are radially aligned with the recesses (14).
  • the cooling fins (17) and orientation channels (16) are molded for pinning. Inside there is a channel for receiving the pressure wires, on which cylindrical, undercut grooves (18, 19) for fastening means are integrally formed.
  • 3 and 5 show a radial section or a plan view of the pole faces of a base plate (2) with inserted magnetic yokes (3).
  • the yokes (3) are held in cutouts (22).
  • punched-out areas (21) for the passage of the winding ends and orientation holes (26) for pinning with the orientation channels are made in the base plate (2).
  • Connection wiring for the windings is applied to the base plate (2).
  • Fig. 6 shows a section of a stamped part made of thin sheet metal, which serves as a central bearing plate (70) and for receiving the anchor jewels has segment-shaped cutouts (75). These cutouts (75) each have laterally expanded bearing chambers (76) for receiving the pivot bearing journals (52), FIG. 8.
  • Guide tabs (77) on both sides near the Storage chambers (76) provide a lateral anchor guide.
  • Orientation holes (74) serve for pinning with the other sheets and the light metal body.
  • Fig. 7 shows a section of the further spacer plates (71), which limit the position of the pivot bearing pin on both sides of the central bearing plate, so that largely closed bearing chambers are formed, which are advantageously filled with a permanent lubricant.
  • Corresponding segment punchings (72) are made in the thin sheet for the free armature movement.
  • the orientation holes (73) serve for pinning.
  • Fig. 8 shows an anchor (5) in supervision. It is composed of stamped, highly permeable anchor plates (53, 53M) in layers.
  • the middle anchor plate (53M) is continued to the most favorable needle connection length, so that the pressure needle (51) is welded to the end face.
  • the pivot bearing pin (52) is welded into a groove (54) at the opposite end.
  • the arrangement of the pin (52) in the groove (54) is shown in cross section in FIG. 1.
  • the thickness of the pin (52) corresponds to the thickness of the central bearing plate with narrow tolerances.
  • the anchor can also be manufactured as a sintered part instead of from sheet metal.
  • An eccentric arrangement of the pivot bearing journal in the spacer and the use of only two spacer plates for it or a section of the extruded profile material as a spacer is within the scope of the expert's ability.
  • a wedge-shaped configuration of the armature tapered in accordance with the armature swivel angle can be selected, which represents an optimization.
  • FIG. 9 shows a supplement to the arrangement according to FIG. 1 with reset electromagnets (3A, 4A).
  • a reset electromagnet (3A, 4A) acting on the armature (5) is arranged 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. 10 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 (1Q), which expediently contains a pulse pause control (PP) and a free-wheeling 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.
  • a controllable current source (1Q)
  • PP pulse pause control
  • FD free-wheeling 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 print material available, 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 an appropriately 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 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, whereby a substantial acceleration of the current build-up or breakdown is achieved.
  • transfer diodes (D3, D4) mutually form a series connection of these windings, the blocking diodes (D1, D2) effecting their mutual decoupling.
  • the flow during the reset 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. 10 to 20 microseconds, after which the energization of the restoring magnets (3A, 4A) takes place with 1/3 to 1/10 times the tightening flow until the armature (5) hits the stop and there its rebound energy has given, which is about 3/2 to 1 times the tightening time required. The current is then switched down to the holding current of approx.
  • the specified working areas relate to printing up to 5 uses and more than 5 uses.
  • the appropriate values depending on the application are specified.
  • the default values are preferably changed over 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.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Impact Printers (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
EP88107413A 1987-05-08 1988-05-07 Tête d'impression à aiguilles avec électro-aimants à armature battante Expired - Lifetime EP0293638B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88107413T ATE66868T1 (de) 1987-05-08 1988-05-07 Nadeldruckkopf mit klappankermagneten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3715304 1987-05-08
DE19873715304 DE3715304A1 (de) 1987-05-08 1987-05-08 Nadeldruckkopf mit klappankermagneten und ansteuerverfahren dafuer

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP90115152.2 Division-Into 1988-05-07
EP90115152A Division EP0401881B1 (fr) 1987-05-08 1988-05-07 Tête d'impression à aiguilles avec électro-aimants d'actionnement et de retour à armature battante

Publications (2)

Publication Number Publication Date
EP0293638A1 true EP0293638A1 (fr) 1988-12-07
EP0293638B1 EP0293638B1 (fr) 1991-09-04

Family

ID=6327069

Family Applications (2)

Application Number Title Priority Date Filing Date
EP88107413A Expired - Lifetime EP0293638B1 (fr) 1987-05-08 1988-05-07 Tête d'impression à aiguilles avec électro-aimants à armature battante
EP88903844A Pending EP0316376A1 (fr) 1987-05-08 1988-05-07 Tetes d'imprimante a aiguilles avec aimants a armatures battantes

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP88903844A Pending EP0316376A1 (fr) 1987-05-08 1988-05-07 Tetes d'imprimante a aiguilles avec aimants a armatures battantes

Country Status (7)

Country Link
US (1) US4988223A (fr)
EP (2) EP0293638B1 (fr)
KR (1) KR890701371A (fr)
AT (1) ATE66868T1 (fr)
DE (3) DE3715304A1 (fr)
ES (1) ES2043200T3 (fr)
WO (1) WO1988008792A1 (fr)

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US5150976A (en) * 1987-05-08 1992-09-29 Siemens-Nixdorf Informationssysteme Ag Matrix printing head with forward and return articulated-armature magnets
US5215389A (en) * 1990-02-28 1993-06-01 Citizen Watch Co., Ltd. Print head for a dot matrix printer
JP2938979B2 (ja) * 1990-12-21 1999-08-25 シチズン時計株式会社 プリンタの印字ヘッド
US5701727A (en) * 1995-01-13 1997-12-30 Datacard Corporation Card affixing and form folding system
US7314323B2 (en) * 2003-09-03 2008-01-01 Toshiba Tec Kabushiki Kaisha Wire dot printer head and wire dot printer
US6848843B1 (en) * 2003-09-03 2005-02-01 Toshiba Tec Kabushiki Kaisha Wire dot printer head and wire dot printer
US7008126B2 (en) * 2003-09-04 2006-03-07 Toshiba Tec Kabushiki Kaisha Wire dot printer head and wire dot printer
US7172351B2 (en) * 2004-01-26 2007-02-06 Toshiba Tec Kabushiki Kaisha Method for manufacturing an armature
JP2005254665A (ja) * 2004-03-12 2005-09-22 Toshiba Tec Corp アーマチュア、ワイヤドットプリンタヘッド及びワイヤドットプリンタ
JP4562406B2 (ja) 2004-03-12 2010-10-13 東芝テック株式会社 ワイヤドットプリンタヘッド及びワイヤドットプリンタ
JP2005254663A (ja) * 2004-03-12 2005-09-22 Toshiba Tec Corp ワイヤドットプリンタヘッド及びワイヤドットプリンタ
JP4515121B2 (ja) * 2004-03-15 2010-07-28 東芝テック株式会社 ワイヤドットプリンタヘッド及びワイヤドットプリンタ
JP2005254732A (ja) * 2004-03-15 2005-09-22 Toshiba Tec Corp ワイヤドットプリンタヘッド及びワイヤドットプリンタ
JP2005262803A (ja) * 2004-03-22 2005-09-29 Toshiba Tec Corp ヨークの製造方法、ヨーク、ワイヤドットプリンタヘッド及びワイヤドットプリンタ
JP4473021B2 (ja) * 2004-03-22 2010-06-02 東芝テック株式会社 窒化層形成方法、磁気回路形成部材、アーマチュア、ワイヤドットプリンタヘッド及びワイヤドットプリンタ
JP4628689B2 (ja) * 2004-03-23 2011-02-09 東芝テック株式会社 ワイヤドットプリンタヘッド及びワイヤドットプリンタ
JP4589023B2 (ja) * 2004-03-23 2010-12-01 東芝テック株式会社 アーマチュア、ワイヤドットプリンタヘッド及びワイヤドットプリンタ

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GB2073497A (en) * 1980-03-27 1981-10-14 Nippon Telegraph & Telephone Printer heads for serial dot printers
US4407591A (en) * 1980-08-21 1983-10-04 Ing. C. Olivetti & C., S.P.A. Ballistic wire matrix print head
US4428691A (en) * 1980-09-11 1984-01-31 Nippon Electric Co., Ltd. Dot matrix printer head
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
EP0293638B1 (fr) 1991-09-04
ES2043200T3 (es) 1993-12-16
KR890701371A (ko) 1989-12-20
EP0316376A1 (fr) 1989-05-24
DE3715304A1 (de) 1988-12-01
DE3864587D1 (de) 1991-10-10
ATE66868T1 (de) 1991-09-15
DE3884225D1 (de) 1993-10-21
WO1988008792A1 (fr) 1988-11-17
DE3715304C2 (fr) 1989-03-23
US4988223A (en) 1991-01-29

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