EP0156767B1 - Imprimante matricielle à aiguilles - Google Patents

Imprimante matricielle à aiguilles Download PDF

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Publication number
EP0156767B1
EP0156767B1 EP85810084A EP85810084A EP0156767B1 EP 0156767 B1 EP0156767 B1 EP 0156767B1 EP 85810084 A EP85810084 A EP 85810084A EP 85810084 A EP85810084 A EP 85810084A EP 0156767 B1 EP0156767 B1 EP 0156767B1
Authority
EP
European Patent Office
Prior art keywords
needles
needle
fact
plane
section
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
EP85810084A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0156767A1 (fr
Inventor
Jacques Vermot-Gaud
Didier Joyeux
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.)
Battelle Memorial Institute Inc
Original Assignee
Battelle Memorial Institute Inc
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 Battelle Memorial Institute Inc filed Critical Battelle Memorial Institute Inc
Priority to AT85810084T priority Critical patent/ATE39646T1/de
Publication of EP0156767A1 publication Critical patent/EP0156767A1/fr
Application granted granted Critical
Publication of EP0156767B1 publication Critical patent/EP0156767B1/fr
Expired 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
    • B41J1/00—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies
    • B41J1/22—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection
    • 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
    • B41J2/25—Print wires
    • 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
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/22—Paper-carriage guides or races
    • 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

Definitions

  • the present invention relates to a needle printer comprising a set of needles, each of which is connected to a support and one end of which is free, members for guiding these needles and means for applying said respective free ends against a surface of the invention.
  • writing associated with pressure-sensitive marking means each needle being formed of an electrical conductor, a portion of which deviates laterally from an axis connecting said guide people to the end integral with said support and which is connected, on either side of said portion, at the two respective poles of a current source a magnetic field generator being arranged to form a field which, in the presence of a current in said portion of the conductor, generates electrodynamic forces tending to reduce, respectively to move this portion away from said axis, in the direction of the current.
  • a loop is formed in the portion of the conductor spaced laterally from the needle guide axis. This loop is placed in a plane perpendicular to the plane containing the rest of the conductor and its laterally spaced portion.
  • a magnet pole is placed opposite said loop with its diverging flux oriented to penetrate this loop.
  • the object of the present invention is precisely to remedy this gap by a solution allowing the electrodynamic actuation not only of one needle, but of several needles forming a matrix printer.
  • the subject of this invention is a needle matrix printer according to claim 1.
  • the proposed solution is simple. It allows the stacking of all the needles of the printer in the air gap of the same magnet since only the needles fed by current pulses move. The size of such a printer can be greatly reduced due to the stacking of needles.
  • FIGS. 1 to 3 illustrates the principle of electrodynamic actuation of the needle printer object of the invention.
  • the head of this printer comprises a series of needles 1 of rectangular sections, stacked on one another with the interposition of an electrical insulating coating. These needles are fixed at their rear ends to a support 2 and pass through a guide 3 located near their front ends. These needles 1 have, between this support 2 and this guide 3, three inflection points 4, 5 and 6, so that the needles 1 form, with the straight line joining the inflection points 4 and 6, a very flat isosceles triangle. This portion of the needles 1 is disposed in the air gap of a permanent magnet 7. With respect to the front ends of the needles 1, a bundle comprising at least one ink carrier 17 and a sheet to be printed 18, is placed on a support 19.
  • Fig. 4 illustrates the electrical supply of the needles 1.
  • This comprises a current pulse generator 8, a step-down transformer 9, a conductor 10, one end of which is connected to the needle 1 near its fixed support 2 and of which the other end is flexible and connected near the other end of needle 1, so that current 1 flows through the isosceles sides of needle 1.
  • the electrical resistance of the electrical circuit including the needle portion and the secondary of the transformer is of the order of 0.01 to 0.1 ohm for example, so that the current is of the order of 1 to 20 A.
  • 10 A in secondary corresponds to 0.5 A in primary. If the resistance of the needle actuation circuit is 0.02 ohm, the secondary voltage is 0.2 volts and the primary voltage is 10 volts.
  • the iron section of the transformer must be approximately 0.3 cm 2 . They are therefore very small transformers which can be placed on the print head or outside of this head and remain stationary.
  • two symmetrical needles 11a a and 11b are fixed to each other by forming a loop 12. Between the adjacent parts of the two needles, going from the support 13 to the first inflection point 14, an electrical insulator 15 separates the two needles. The isolated parts of these needles are connected respectively to the two ends of the secondary of the supply transformer 16. The current pulses thus pass through the loop 12 which is located in the magnetic field of a magnet 7 as described above. In this variant, the forces induced on the two needles 11a and 11b are opposite and the resulting force of the needles is therefore doubled.
  • the support 13 to which the rear end of this double needle 11a and 11b is fixed is, in this example, an ultrasonic transducer located at a distance ⁇ / 4 from its nodal point of attachment 21 also located at a distance ⁇ / 4 from the free end of the double needle 11a, 11b.
  • the needles 11a and 11b do not transmit ultrasound, the part of these needles located behind the support 21 can be deleted.
  • the variant of fig. 6 illustrates a double needle 22, 23 the rear ends of which are fixed to an oscillator 24 formed by a ceramic 5 mm in diameter, for example located at the nodal fulcrum and fixed to the end of a steel rod 25
  • the oscillator intended to generate the ultrasonic vibrations is therefore integrated into the needle.
  • the magnet length can be reduced to:
  • the Samarium Cobalt is no longer necessary, the Ticonal 800 being sufficient.
  • the induction of the magnet can also be enhanced by concentrations of pure iron as will be shown later.
  • the needles can be stacked without having to concentrate their points, the stack corresponding to the height of the characters to be printed.
  • the magnets also serve as guide elements.
  • the stacked needles can be isolated from each other by varnishes or fine ceramics, this insulation can also be used to isolate the needles from the magnets.
  • the point of the needles can also be isolated by a coating of glass or an equivalent material covering the end of the needle or the surface of the support 19 of the bundle formed of the ink support 17 and of the paper 18.
  • two 26 l stainless steel wires 50 lm in diameter can be taken and coated in the areas of greater rigidity and electrical conductivity with aluminum to form bars 27 which may have for example 0.15 mm thick and 2 mm wide, these bars being separated from each other by spaces of 4 mm.
  • the points of inflection are weakened by notches 28 made in the width of the strips 29 of rectangular section.
  • Fig. 9 illustrates an embodiment of such a needle.
  • This needle 30 is constituted by two strips of rectangular section 1 x 0.15 mm linked by their face 1 mm wide and fixed at their rear ends to an amplifier 31 connected to an ultrasonic transducer 32.
  • the total length of the needle is an integer multiple of 1/2 while the fulcrum of this needle is at a nodal point corresponding to ⁇ / 4.
  • the two rear portions of the blades of the needle 30 are electrically insulated by an insulating varnish and these blades are connected to a supply similar to those described above at their nodal fulcrum.
  • the lamellae of the needle 30 are made of a metal combining sufficient elastic mechanical properties ( typically 40 kg / mm 2 at least) with as low a resistivity as possible.
  • a metal combining sufficient elastic mechanical properties ( typically 40 kg / mm 2 at least) with as low a resistivity as possible.
  • hard copper alloys CuAg to CuCd, bronze to phosphorus
  • pure metals such as molybdenum
  • composite materials such as silver with a precipitate of MgO or molybdenum or steel coated with copper.
  • the width of the slats exceeds 0.35 mm, it is always possible to produce a print head by stacking the needles, but in this case it is necessary to provide for convergence of the point of the needles.
  • FIG. 10 illustrates a variant of needle 34 in which the less rigid inflection zones 35 are produced by twisting the strips of rectangular section constituting the needle, by 90 ° around the longitudinal axis so that the width of these strips is perpendicular to the direction of the forces generated by the electrodynamic effect of the magnets 36 on the strips of the needle 34 traversed by an electric current.
  • the thickness of the strips which defines the air gap. The width of the slats being in the plane of the air gap, their rigidity in this portion is therefore greater with respect to the forces exerted than that of the inflection zones and the air gap is minimum.
  • Fig. 11 shows how a multi-needle printing head can be produced with such needles. Since such needles cannot be purely and simply stacked, the stacking of needles 34 can be carried out with the interposition of iron blades 37 intended to compensate for the difference between the width of the lamellae of the less rigid inflection zones 35 and the thickness of the lamellae of the more rigid parts connecting these inflection zones 35. These iron blades make it possible to reinforce the induction by playing the role of concentrators and thus to obtain a weak air-gap effect. The ends of the needles 34 must then be brought close to each other on either side of the needle located in the center of the print head.
  • the needles can also be formed by round wires of uniform or stamped section in the areas with greater flexibility. Indeed, numerous tests have made it possible to verify the good behavior of the round wire.
  • An alternative is also to lightly laminate round wire so as to obtain a ribbon with a rounded edge in a thickness / width ratio of 2/3.

Landscapes

  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Impact Printers (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Sewing Machines And Sewing (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Pens And Brushes (AREA)
EP85810084A 1984-03-07 1985-03-01 Imprimante matricielle à aiguilles Expired EP0156767B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85810084T ATE39646T1 (de) 1984-03-07 1985-03-01 Matrixnadeldrucker.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1124/84A CH658627A5 (fr) 1984-03-07 1984-03-07 Imprimante matricielle a aiguilles.
CH1124/84 1984-03-07

Publications (2)

Publication Number Publication Date
EP0156767A1 EP0156767A1 (fr) 1985-10-02
EP0156767B1 true EP0156767B1 (fr) 1989-01-04

Family

ID=4203049

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85810084A Expired EP0156767B1 (fr) 1984-03-07 1985-03-01 Imprimante matricielle à aiguilles

Country Status (12)

Country Link
US (1) US4600322A (da)
EP (1) EP0156767B1 (da)
JP (1) JPS60206669A (da)
KR (1) KR850006518A (da)
AT (1) ATE39646T1 (da)
AU (1) AU3953785A (da)
CH (1) CH658627A5 (da)
DE (1) DE3567169D1 (da)
DK (1) DK99885A (da)
ES (1) ES540946A0 (da)
GR (1) GR850553B (da)
YU (1) YU35485A (da)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4745386A (en) * 1986-06-27 1988-05-17 Smith Corona Corporation Solenoid device
US4871271A (en) * 1986-08-20 1989-10-03 Fuji Photo Film Co., Ltd. Printing head for a wire dot printer
US4859095A (en) * 1986-08-20 1989-08-22 Fuji Photo Film Co., Ltd. Printing head with current passing through the print wire
DE3813420A1 (de) * 1988-04-21 1989-11-02 Philips Patentverwaltung Nadeldrucker
GB8908600D0 (en) * 1989-04-15 1989-06-01 Woodward William H Linear actuator

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3715020A (en) * 1970-09-21 1973-02-06 Teletype Corp Wire recording and mechanism therefor
GB1423518A (en) * 1972-03-02 1976-02-04 Emi Ltd Print heads
US3918567A (en) * 1973-03-28 1975-11-11 Edward D Kittredge Process printing
US4083299A (en) * 1977-01-24 1978-04-11 C. Itoh Electronics, Inc. Electromagnetic striking members selectively actuated in time from alternating current power
DE2756134A1 (de) * 1977-12-16 1979-06-21 Ibm Deutschland Piezoelektrisch gesteuerte antriebsanordnung zur erzeugung hoher stossgeschwindigkeiten und/oder gesteuerter huebe
US4211493A (en) * 1978-08-30 1980-07-08 Burroughs Corporation Impact printing apparatus
SU867682A1 (ru) * 1979-07-17 1981-09-30 Предприятие П/Я М-5579 Мозаична печатающа головка

Also Published As

Publication number Publication date
KR850006518A (ko) 1985-10-14
ES8602492A1 (es) 1985-12-01
JPS60206669A (ja) 1985-10-18
AU3953785A (en) 1985-09-12
DE3567169D1 (en) 1989-02-09
EP0156767A1 (fr) 1985-10-02
ATE39646T1 (de) 1989-01-15
YU35485A (en) 1988-06-30
US4600322A (en) 1986-07-15
GR850553B (da) 1985-07-05
DK99885D0 (da) 1985-03-05
CH658627A5 (fr) 1986-11-28
DK99885A (da) 1985-09-08
ES540946A0 (es) 1985-12-01

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