EP0188669B1 - Matrixdruckkopf - Google Patents

Matrixdruckkopf Download PDF

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Publication number
EP0188669B1
EP0188669B1 EP85113392A EP85113392A EP0188669B1 EP 0188669 B1 EP0188669 B1 EP 0188669B1 EP 85113392 A EP85113392 A EP 85113392A EP 85113392 A EP85113392 A EP 85113392A EP 0188669 B1 EP0188669 B1 EP 0188669B1
Authority
EP
European Patent Office
Prior art keywords
armature
plate
printing head
magnetic
head according
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
EP85113392A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0188669A2 (de
EP0188669A3 (en
Inventor
Bernd Dipl.-Ing. Gugel (Fh)
Harald Dipl.-Ing. Niebel (Fh)
Hubert Ott
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.)
Vodafone GmbH
Original Assignee
Mannesmann 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 Mannesmann AG filed Critical Mannesmann AG
Priority to AT85113392T priority Critical patent/ATE55729T1/de
Publication of EP0188669A2 publication Critical patent/EP0188669A2/de
Publication of EP0188669A3 publication Critical patent/EP0188669A3/de
Application granted granted Critical
Publication of EP0188669B1 publication Critical patent/EP0188669B1/de
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
    • B41J2/28—Actuators for print wires of spring charge type, i.e. with mechanical power under electro-magnetic control

Definitions

  • the invention relates to a matrix print head, in particular for serial character formation, with an electromagnetic coil assembly, consisting of a magnetic flux guide plate, to which magnetic pole cores with electromagnetic coils and a permanent magnet plate are fastened, and with an armature assembly, which rests against the electromagnetic coil assembly, consisting of an armature plate and attached armature, which can be deflected in the direction of the magnetic pole cores, with one or more pressure elements, the armature arms being retractable against the magnetic pole cores by means of the permanent magnet plate in the retracted position of the pressure elements, with a single, uncritical parasitic air gap in each case between the armature plate and an associated one Anchor arm is provided.
  • an electromagnetic coil assembly consisting of a magnetic flux guide plate, to which magnetic pole cores with electromagnetic coils and a permanent magnet plate are fastened
  • an armature assembly which rests against the electromagnetic coil assembly, consisting of an armature plate and attached armature, which can be deflected in the direction of the magnetic pole cores, with one
  • Such matrix print heads are moved back and forth in front of writing abutments (platen rollers), the selectively energized electromagnetic coils being energized to cancel a permanent magnetic field which, in the idle state, holds the armature arm with the pressure element in a retracted position. In this retracted position the sprung arm, i.e. the armature arm is held for the purpose of pretensioning, so that when the magnetic field caused by the permanent magnet plate is canceled, mechanical energy is immediately available for firing the pressure element.
  • Such a printing system is characterized by a high number of strokes per second, so that the time for shooting, printing and moving back to the rest position only limits the printing speed for each individual printing element.
  • serial character formation individual or all points within a character are set by the same or different printing elements within a character, while in the case of line-by-character formation, the printing elements are arranged horizontally next to one another in a line, e.g. 66 printing elements that always work in a line, the recording medium, i.e. a paper web, is advanced accordingly after each dot line.
  • the matrix print head In the case of line-by-line character formation, the matrix print head, usually referred to as a hammer bank, swings horizontally by one to two character widths, just as the matrix print head is moved back and forth horizontally in the case of serial character formation, but over the full paper web width.
  • the arrangement of the permanent magnets according to the prior art is disadvantageous because their magnetic flux is weakened by undesirable stray fluxes in adjacent components.
  • the spring-loaded anchor arms have disadvantageous spring arrangements.
  • the invention has for its object to make the build-up or breakdown of the magnetic fluxes or magnetic fields of the permanent magnet and / or the electromagnet more effective, avoid unwanted stray fluxes and still create a matrix print head with sufficient accuracy of the individual parts, without expensive, have to adhere to tight tolerances in the manufacture of the individual parts or the entire matrix print head.
  • the magnetic flux guide plate and the anchor plate are set back on the outside in relation to the permanent magnet plate.
  • a breakdown of the design of the matrix printhead is both manufacturing and assembly technology when divided into an electromagnetic coil assembly and in one Anchor assembly can be achieved particularly cheaply if, according to further features, an intermediate plate is arranged between the magnetic flux guide plate and the anchor plate, which forms a plane with the end face of the magnetic pole cores. It is advantageous, after final assembly, to carry out a precise height adjustment of the intermediate ring and magnetic pole cores by means of a common finishing process, the common plane being formed.
  • Magnetic stray fluxes i.e. an increase in the effective magnetic force is also avoided in that the intermediate plate is also set back on the outside with respect to the permanent magnet plate.
  • Both the system of the armature arms on the magnetic pole cores, the length of the resilient parts of the armature arms, the clamping of the resilient armature arms can also be improved in that the thickness of the armature plate corresponds approximately to the thickness of the armature arms, that a gradation on the armature plate opposite the armature arms is provided and that a relatively short spring arm is attached to the remaining anchor plate surface, each of which is connected to an anchor arm.
  • magnetic stray fluxes can be eliminated, whereby the magnetic circuit becomes shorter, the magnetic flux could be used more intensively and therefore also with less energy of the permanent magnet plate, by further features the magnetic flux guide plate ending with the outer surface of the magnetic pole cores facing the pressure elements.
  • the guidance of the magnetic flux is further improved in that the intermediate plate stands back from the permanent magnet plate on the side facing the electromagnetic coils.
  • the previously described matrix print head can work as a so-called hammer bank of a matrix line printer, there is the possibility of obtaining a matrix print head for serial character formation in that the magnetic flux guide plate, permanent magnet plate, intermediate plate of the electromagnetic coil assembly and the armature plate of the armature assembly are each designed in a ring shape and concentrically are arranged.
  • the electrically or magnetically non-conductive housing consists of two connectable housing parts and the electromagnetic coil assembly in one housing part and the armature assembly are arranged essentially within the other housing part.
  • the connection of the two housing parts therefore brings about the final assembly of the matrix print head, and on the other hand, the loosening of the two housing parts serves to be able to carry out required maintenance work easily and quickly.
  • the magnetic flux guide plate is closed in the case of a ring-shaped design by means of a circuit board receiving the electrical conductors for the electromagnetic coils.
  • the connection for the electromagnetic coils can be easily accomplished by means of plug connections or by means of trailing cables.
  • the arrangement according to the invention of a magnetic flux plate, a correspondingly dimensioned permanent magnet plate, a correspondingly dimensioned intermediate plate and the armature plate with the marked gradation advantageously leads to a radially considerable spacing of the electromagnetic coils from the central axis of the matrix print head. It is therefore particularly advantageous that the number of pressure elements, electromagnetic coils and armature arms distributed over the circumference is more than 9, preferably more than 18.
  • Such an 18- or 24-wire printhead (or a matrix printhead with even more printing elements) produces a particularly easy-to-read font if the number of printing elements distributed over the circumference on the mouthpiece is divided into at least one column.
  • Such a printing element structure is used both for fast and for beautiful writing of a high number of characters per unit of time.
  • FIG. 1 is a half axial cross section through a serial matrix print head according to the invention, the lower half being shown in view,
  • Fig. 3 is a partial axial section according to FIG. 2 on an enlarged scale.
  • the serial matrix print head shown in the drawing has an electromagnetic coil assembly 1, which consists of a magnetic flux guide plate 2, magnetic pole cores 3 fastened to it with electromagnetic coils 4 and a permanent magnet plate 5.
  • the electromagnetic coil assembly 1 is opposite an armature assembly 6, which consists of an armature ring 7, (in the drawing) to the left and to the right according to FIG. 1 armature arms 8, the armature arms 8 each by means of relatively short spring arms 9 with the Anchor ring 7 are connected.
  • the number of magnetic pole cores of the electromagnetic coils 4, the armature arms 8 and the spring arms 9 corresponds, as usual, to the number of pressure elements 10, which in the exemplary embodiment are designed as relatively long pressure needles and are stored in a mouthpiece 11.
  • there are 2 times 12 24 pressure elements within the electrically or magnetically non-conductive housing 12, which consists of the two housing parts 12a and 12b is composed and is held together by means of screws 13 distributed over the circumference of the housing.
  • the pressure elements 10 are guided around the pressure path (approx. 0.3 to 0.6 mm) essentially axially movable in a guide housing 14 in bearings 15.
  • the guide housing 14 is mounted very precisely to the housing 12 by means of dowel pins 16.
  • Supplements 17 are located between the housing 12 and the guide housing 14 in order to determine the exit length of the pressure elements 10 from the guide housing 14 and also to be able to change them later.
  • the guide housing 14 serves at the same time for fastening the matrix print head on a carriage (not shown) or the like, which is moved back and forth in front of a pressure abutment.
  • a flange 14a and at least two dowel pins 14b are provided for fastening.
  • steps 21 on the magnetic flux guide plate 2 and steps 22 on the armature plate 7, based in each case on the permanent magnet plate 5, are met, steps 21 and 22 being associated with a retraction in the sense of a constriction of the magnetic field lines.
  • the air gap 20 is not critical if the air in the gap 20 is optimally magnetized. Such an optimal magnetization of the air gap 20 is present when the air gap is dimensioned so large that on the one hand no tight tolerances for the manufacture of the anchor ring 7 or the anchor arms 8 have to be required and on the other hand the field line density is indeed large enough to accommodate the pretensioning force the spring arms 9 to keep the balance, but on the other hand is not too high to hinder a rapid breakdown of the permanent magnetic field when switching on the electromagnetic coils 4. This practically ideal case is in the construction according to the invention.
  • An intermediate plate 24 arranged between the magnetic flux guide plate 2 and the armature ring 7 forms with its end face 24a a uniform plane 25 (FIG. 3), the armature ring 7 resting against the intermediate plate 24 in the plane 25 when the housing parts 12a and 12b are connected.
  • the armature arms 8 lie in the retracted position (as shown in FIG. 1) at a slight angle to the plane 25 and rest on the associated magnetic pole cores 3.
  • the thickness of the anchor ring 7 corresponds approximately to the thickness of the anchor arms 8, including the relatively small thickness of the spring arms 9, which are connected to the anchor arms 8 and the anchor ring 7.
  • the very short spring arm 8 receives a shortened clamping length by a gradation 7a, so that the remaining anchor ring surface 7b is available for the connection.
  • the gradation 7a additionally creates a freedom of bending for the armature arm 8.
  • the gradation 7a practically represents a continuation of the air gap 20 under certain circumstances.
  • the magnetic flux guide plate 2 which ends opposite the side of the pressure elements 10 approximately at the level of the magnetic pole cores 3.
  • the intermediate plate 24 is set back from the permanent magnet plate 5 by means of the step 26.
  • the matrix printhead can be designed as a serial printhead, in which case the magnetic flux guide plate 2, the permanent magnet plate 5, the intermediate plate 24 of the electromagnetic coil assembly 1 and the armature plate 7 of the armature assembly 6 are each ring-shaped and arranged concentrically (as shown in the drawing) is).
  • the electromagnetic coil assembly 1 is housed in the housing part 12a and the armature assembly 6 essentially in the other housing part 12b.
  • the magnetic flux guide plate 2 is closed in the case of an annular design of the matrix print head by means of a circuit board 2 which receives the electrical conductors 27 and 28 for the electromagnetic coils 4, respectively.
  • the printed circuit board 29 are the printing elements 10 (in the case of an annular design of the matrix print head) and in the case of a number of more than 18, e.g. with 2x12 pressure wires, arranged on the mouthpiece 11 in two columns 30 (FIG. 2).

Landscapes

  • Impact Printers (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Facsimile Heads (AREA)
  • Magnetic Heads (AREA)
EP85113392A 1985-01-25 1985-10-22 Matrixdruckkopf Expired - Lifetime EP0188669B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85113392T ATE55729T1 (de) 1985-01-25 1985-10-22 Matrixdruckkopf.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853502469 DE3502469A1 (de) 1985-01-25 1985-01-25 Matrixdruckkopf
DE3502469 1985-01-25

Publications (3)

Publication Number Publication Date
EP0188669A2 EP0188669A2 (de) 1986-07-30
EP0188669A3 EP0188669A3 (en) 1988-06-01
EP0188669B1 true EP0188669B1 (de) 1990-08-22

Family

ID=6260757

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85113392A Expired - Lifetime EP0188669B1 (de) 1985-01-25 1985-10-22 Matrixdruckkopf

Country Status (5)

Country Link
US (1) US4695174A (enrdf_load_stackoverflow)
EP (1) EP0188669B1 (enrdf_load_stackoverflow)
JP (1) JPS61172745A (enrdf_load_stackoverflow)
AT (1) ATE55729T1 (enrdf_load_stackoverflow)
DE (2) DE3502469A1 (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1331313C (en) * 1988-07-08 1994-08-09 Akio Yano Printing head of wire-dot impact printer
US5102245A (en) * 1989-08-26 1992-04-07 Citizen Watch Co., Ltd. Print head
JP4905093B2 (ja) * 2006-12-01 2012-03-28 ブラザー工業株式会社 工作機械の主軸装置
CA2680348A1 (en) * 2008-09-23 2010-03-23 Maax Bath Inc. Fastener for bathing apparatus

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE7606042L (sv) * 1975-10-10 1977-04-11 Florida Data Corp Snabbarbetande elektromagnetiskt skrivhuvud
JPS54104925A (en) * 1978-02-01 1979-08-17 Suwa Seikosha Kk Dot printer head
GB2049557B (en) * 1979-05-11 1983-03-16 Oki Electric Ind Co Ltd Dor printer head
JPS5637176A (en) * 1979-09-03 1981-04-10 Oki Electric Ind Co Ltd Printing head for dot printer
GB2064874B (en) * 1979-12-10 1984-10-17 Florida Data Corp Electromagnetic actuator for high speed dot matrix impact printer
JPS5749576A (en) * 1980-09-11 1982-03-23 Nec Corp Printing head of dot matrix printer
US4351235A (en) * 1980-09-11 1982-09-28 Mannesmann Tally Corporation Dot printing mechanism for dot matrix line printers
US4498791A (en) * 1983-03-28 1985-02-12 Texas Instruments Incorporated Printer having improved stored energy printhead

Also Published As

Publication number Publication date
EP0188669A2 (de) 1986-07-30
JPS61172745A (ja) 1986-08-04
ATE55729T1 (de) 1990-09-15
DE3579309D1 (de) 1990-09-27
EP0188669A3 (en) 1988-06-01
DE3502469A1 (de) 1986-07-31
US4695174A (en) 1987-09-22
DE3502469C2 (enrdf_load_stackoverflow) 1991-09-12

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