US3755700A - Electromagnetic drive - Google Patents

Electromagnetic drive Download PDF

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Publication number
US3755700A
US3755700A US00245897A US3755700DA US3755700A US 3755700 A US3755700 A US 3755700A US 00245897 A US00245897 A US 00245897A US 3755700D A US3755700D A US 3755700DA US 3755700 A US3755700 A US 3755700A
Authority
US
United States
Prior art keywords
armature
coil
needle
magnet coil
drive 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
US00245897A
Other languages
English (en)
Inventor
H Buschmann
E Mehlhart
E Pomplun
A Schwibbe
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
Nixdorf Computer AG
Original Assignee
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 Nixdorf Computer AG filed Critical Nixdorf Computer AG
Application granted granted Critical
Publication of US3755700A publication Critical patent/US3755700A/en
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
    • B41J2/285—Actuators for print wires of plunger type

Definitions

  • ABSTRACT An electromagnetic drive for the needle of a needle printer comprising a pair of cylindrical magnet pole shoes disposed within a cylindrical'magnet coil and connected with the needle.
  • the present invention relates to needle printing devices and more particularly to electromagnetic drive for the needle of such devices.
  • Electromagnetic drives are used for causing a needle moved by them to stroke an ink support so that ink is transferred to a record support inserted behind the ink support.
  • Mosaic-like arrangement and selective triggering of several electromagnetic drives allows the recording of characters.
  • Needle printers are often used in data processing machines to print data on a record support. It frequently happens, especially in the case of bookkeeping machines, that the same needle printer has to record consecutively on record supports of different thickness.
  • a blank form can be arrangedon one side of the printing area and a copybook on the other side whereby records are to be made on both record supports.
  • the quality of the record depends upon the distance between the printing tips of the needles and the record support as well as upon the force exerted each time on the needle. Furthermore, the speed of the printing process depends upon the speedwith which the drive for the needles responds so that the recording frequency is limited by the type of the respective drive.
  • the present invention has as its object the design of an improved electromagneticdrive for the needle of a needle printer which without change of its setting, applies records of equal quality to record supports of different thickness and which has an increased operating frequency as compared to known arrangements.
  • an electromagnetic drive according to the invention is so designed that within a cylindrical magnet coil, opposed in the longitudinal direction of the magnet coil, there are arranged two cylindrical magnet pole shoes, displaceable in the longitudinal direction of the magnet coil, connected with the me dle, and having the end that is remote from the needle pressed against a damping element by a spring when the magnet coil is without current.
  • the spring cooperating with the damping element urges the armature into cylindrical magnet pole shoes so-as to prevent vibrations during the return motion from the operating position to the resting position.
  • the damping element absorbs the total energy acting during the return motion of the armature.
  • the spring can be so dimensioned that different deflections are possible which essentially are determined by the distance between the record support and the printing tip of the needle which is connected with the armature. Then, it is advantageous to use as spring a helical spring having, for the most part, cons tant tension over different lengths of deflection.
  • the armature of the drive can consist of a segment having magnetic conductivity and a segment not having magnetic conductivity whereby each segment is disposed within one respective magnet pole shoe when the magnet coil is without current.
  • the magnetically non-conductive segment performs the function of providing an air gap in which the magnetic field moving the armature becomes effective.
  • this segment can advantageously serve for guiding the armature because its connection with the magnetically conductive segment and its disposition in the other magnet pole shoe can ensure that the longitudinal movement of the total armature takes place free from canting and without interference.
  • the magnetically nonconductive segment can be so designed that it forms a chamber receiving the helical spring. Thereby, the helical spring is firmly enclosed, and the motion of the total armature within the magnet coil attains further precision.
  • the special design and arrangement of the armature which so-to-speak, is suspended between both end positionsresults in a very fast response of the drive.
  • the responding motion is practically free from vibrations since the armature is supported on one side by the spring.
  • the fast response can be even improved when the space surrounding the armature between the magnet pole shoes is filled with a material having electric conductivity. Eddy currents arise in this material, when the magnet coil is switched on, hence, this material causes concentration of the magnetic field to the range of the armature whereby an increased action of force is exerted on the armature.
  • a further measure for fast build-up of themagnetic field consists in that the magnet coil is surrounded by a metal sheath which is slotted in the longitudinal direction of the magnet coil and which is connected with spool flanges which have magnetic conductivity and connect the metal sheathwith the magnet pole shoes.
  • the metal sheath serves for returning the magnetic flux via the spool flange.
  • the slotting in the longitudinal direction of the magnet coil prevents the formation of eddy currents in the metal sheath so that the magnetic field build-up in the interior of the coil is not'delayed because of eddy currents.
  • the needle can be introduced into the magnetic coilpassing through a threaded pin which makes possible adjustment of therange of movement of the armature and serves as an outer support for the spring. Adjustment of the threaded pin adjusts the degree of compression of the spring so that this adjustment makes it possible to attain an optimal adaptation of the working stroke of the armature to the various record supports of different thickness on which records have to be made.
  • a damping disk the position of which can be adjusted by a threaded pin arranged on the magnet coil end that is disk with a central opening which communicates with.
  • the magnetic drive illustrated in the drawing has a magnet coil 1 which is cylindrically formed.
  • the magnet coil 1 is seated on a coil body consisting of two pole shoes 2 and 3 which are arranged in the interior of the magnet coil 1 and which are opposed by a certain distance.
  • An armature is guided in the pole shoes 2 and 3 and consists of two segments 4 and 4a.
  • the segment 4 is constructed of a material having magnetic conductivity while the segment 4a is constructed ofa material not having magnetic conductivity, e.g., plastic.
  • the end of a needle 5 is attached to the armature and is passed through the segment 40 which is not magnetically conductive.
  • the segment 4a is inserted into the magnetically conductive segment 4 and joined with it, for example, by cementing.
  • the end of needle 5 can be likewise cemented whereby at the same time, it can be jammed between the two segments 4 and 4a in the interior of segment 4.
  • the segment is designed cylindrically and to form a chamber for receiving a helical spring 6, the other end of which strikes a threaded pin 12.
  • the threaded pin 12 is provided with a projection which corresponds to the inner diameter of the helical spring 6 so that during compression, the cylindrical form of the helical spring 6 is maintained by the chamber of the armature segment 4a as well as by the projection of threaded pin 12.
  • the threaded pin 12 is provided with set nut 17 which permits adjustment of the threaded pin 12 within the magnet-coil 1. Such an adjustment also changes the position of the helical spring 6 so that the working stroke of the armature 4, 40 can be adjusted.
  • the magnetically conductive piece 4 of the armature has a frontal area which is remote from the magnetically non-conductive segment 4a and which lies against a damping disk 7.
  • the damping disk 7 is provided with a central opening 14.
  • the disk 7 lies on an additional threaded pin 13 which can be adjusted outside of the magnet coil 1 by set nut 18.
  • the threaded pin 13 is provided with a central bore 15 which communicates with the outer space of the drive and permits escape of the air compressed by the return motion of the armature.
  • the space surrounding the armature between the two magnet pole shoes 2 and 3 is filled with a material having electric conductivity.
  • a material having electric conductivity For this purpose, there can be provided, for example, a highly conductive copper ring 8 which upon switching on of the magnet coil 1, causes the formation of strong current eddies in its material.
  • the current eddies concentrate the magnetic field arising between the pole shoes 2 and 3 to be within the range of the armature so that fast response of the drive is ensured. Moreover, the dynamic effect is thereby increased so that if necessary, the current required for feeding the drive can be reduced.
  • the ends of the two pole shoes 2 and 3 are secured in place by two flange parts 10 and 11 and a metal sheath 9 that surrounds the magnet coil 1 and which is clamped between the flange parts 10 and 11.
  • the metal sheath 9 can be provided with a slot (not shown) running in the longitudinal direction of the magnet coil l to prevent the formation of eddy currents.
  • the ring 8 provided between the pole shoes 2 and 3 permits simple centering and distancing between the pole shoes 2 and 3. Furthermore, this ring determines the position of armature 4, 4a, so that the latter merely has to be inserted into the pole shoes 2 and 3 during assembly of the drive. However, a joint insertion of the pole shoes and the armature into the magnet coil is conceivable.
  • the armature 4, 4a takes up a position between the two pole shoes 2 and 3 which deviates from the depicted position whereby the magnetically nonconductive segment 4a produces the equivalent of an air gap between the two pole shoes 2 and 3.
  • the non-conductive segment 40 also has the effect of a guiding element which ensures that the total armature moves free from canting in the longitudinal direction of the magnet coil 1.
  • the needle 5 is mounted in a guide 16 that extends into the threaded pin 12 and is displaced against the effect of the spring 6 by the motion of the armature 4, 4a.
  • the threaded pins 12 and 13 permit adjustment of the working stroke in both limit positions of the armature 4, 40 by simply loosening and tightening the nuts 17 and 18 after corresponding rotation of the threaded pins 12 and 13. These adjustments also affect the operating speed of the drive because greater operating speed results in respectively longer operating time. Furthermore, the tension of the spring 6 is regulated so that adjustment of the threaded pins 12 and 13 can also serve for changing the printing quality at the printing tip of the needle 5.
  • the above-described magnetically non-conductive elements should preferably be also electrically nonconductive in order to avoid the generation of eddy currents which can delay the build-up of the magnetic field moving the armature.
  • An electromagnetic drive for the needle of a needle printer comprising a cylindrical magnet coil, an armature disposed within said coil and operable upon said coil being energized to move said armature axially with respect to said coil, said armature being connected to said needle such that axial, reciprocal movement of said armature produces corresponding movement of said needle, a pair of axially spaced cylindrical pole members disposed intermediate said armature and said coil, an electrically conductive cylindrical member encompassing said armature and disposed intermediate said spaced pole members; and said armature comprising a first member and a second member, said first member being joined to said second member and being magnetically conductive; said second member being magnetically and electrically non-conductive.

Landscapes

  • Impact Printers (AREA)
  • Electromagnets (AREA)
US00245897A 1971-04-21 1972-04-20 Electromagnetic drive Expired - Lifetime US3755700A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2119415A DE2119415B2 (de) 1971-04-21 1971-04-21 Elektromagnetischer Antrieb für die Nadel eines Nadeldruckers

Publications (1)

Publication Number Publication Date
US3755700A true US3755700A (en) 1973-08-28

Family

ID=5805409

Family Applications (1)

Application Number Title Priority Date Filing Date
US00245897A Expired - Lifetime US3755700A (en) 1971-04-21 1972-04-20 Electromagnetic drive

Country Status (9)

Country Link
US (1) US3755700A (OSRAM)
AT (1) AT327591B (OSRAM)
CH (1) CH548643A (OSRAM)
DE (1) DE2119415B2 (OSRAM)
FR (1) FR2136583A5 (OSRAM)
GB (1) GB1343233A (OSRAM)
IT (1) IT957197B (OSRAM)
NL (1) NL7205172A (OSRAM)
SE (1) SE380914B (OSRAM)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4010390A (en) * 1974-05-24 1977-03-01 Lucifer S.A. Electromagnetic actuator comprising a plunger core
US4157873A (en) * 1976-12-07 1979-06-12 Ricoh Co., Ltd. Dot printing apparatus
US4200401A (en) * 1978-05-22 1980-04-29 Ledex, Inc. Print wire solenoid
US4211496A (en) * 1979-01-29 1980-07-08 Small Business Administration Printing solenoid
US4272748A (en) * 1978-05-22 1981-06-09 Ledex, Inc. Print wire solenoid
US4308475A (en) * 1978-07-18 1981-12-29 Sundstrand Corporation Solenoid pump adapted for noiseless operation
US4329921A (en) * 1979-08-20 1982-05-18 Siemens Aktiengesellschaft Damping device for an electromagnetically driven printing hammer
US4441830A (en) * 1982-03-29 1984-04-10 Ncr Corporation Printing solenoid
US4468142A (en) * 1982-11-12 1984-08-28 Genicom Corporation Pint wire actuator
USRE31813E (en) * 1978-05-22 1985-01-22 Ledex, Inc. Print wire solenoid
US4523867A (en) * 1983-07-25 1985-06-18 Genicom Corporation Bi-directional drive print wire actuator with forward-velocity and reverse-position closed loop feedback control
US5071267A (en) * 1986-08-14 1991-12-10 U.S. Philips Corporation Actuation magnet for a printing stylus of a matrix printer
US5434459A (en) * 1993-11-05 1995-07-18 Magnetic Bearing Technologies, Inc. Pulsed power linear actuator and method of increasing actuator stroke force
US20080035871A1 (en) * 2006-08-09 2008-02-14 Shih Shin Technology Co., Ltd. Solenoid arrangement

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018155A (en) * 1975-06-02 1977-04-19 Mohawk Data Sciences Corporation Ballistic print hammer assembly
DE2527186C3 (de) * 1975-06-18 1980-10-09 Philips Patentverwaltung Gmbh, 2000 Hamburg Mosaikdrucker mit einem zylindrischen Gehäuse
DE2640612C3 (de) * 1976-09-09 1982-01-21 Siemens AG, 1000 Berlin und 8000 München Tauchankermagnetsystem und Verfahren zu dessen Herstellung
DE2650873A1 (de) * 1976-11-06 1978-05-11 Philips Patentverwaltung Verfahren zur herstellung eines elektromagneten
SE425067B (sv) * 1981-01-19 1982-08-30 Facit Ab Tryckhammare for skrivare och skrivmaskiner
DE4209967A1 (de) * 1992-03-27 1993-09-30 Bosch Gmbh Robert Einrückrelais für Andrehvorrichtung von Brennkraftmaschinen
US5890287A (en) * 1996-01-10 1999-04-06 Usui Kokusai Sangyo Kaisha Limited Connection structure and process for connecting eye joints and slender metal pipes

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US235948A (en) * 1880-12-28 cheever
US1128036A (en) * 1912-08-29 1915-02-09 Louis Paulero Electric implement.
US1992770A (en) * 1934-02-12 1935-02-26 Frank C Rathbun Dental implement
US2286176A (en) * 1938-10-25 1942-06-09 Earl Products Company Motor assembly
US2469137A (en) * 1945-10-20 1949-05-03 Waugh Equipment Co Vibration indicator
US3149255A (en) * 1962-03-23 1964-09-15 H & T Electrical Products Electrical reciprocating motor
DE1254388B (de) * 1963-09-30 1967-11-16 Siemens Ag Druckwerk zum Abdruck von aus einer Vielzahl von Punkten zusammengesetzten Zeichen
US3372262A (en) * 1963-12-24 1968-03-05 Livshits Abram Lazarevich Hydrosolenoid unit for electroerosion machines
DE1806714A1 (de) * 1968-11-02 1970-06-25 Philips Electrologica Druckwerk zum fliegenden Abdrucken von Zeichen

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US235948A (en) * 1880-12-28 cheever
US1128036A (en) * 1912-08-29 1915-02-09 Louis Paulero Electric implement.
US1992770A (en) * 1934-02-12 1935-02-26 Frank C Rathbun Dental implement
US2286176A (en) * 1938-10-25 1942-06-09 Earl Products Company Motor assembly
US2469137A (en) * 1945-10-20 1949-05-03 Waugh Equipment Co Vibration indicator
US3149255A (en) * 1962-03-23 1964-09-15 H & T Electrical Products Electrical reciprocating motor
DE1254388B (de) * 1963-09-30 1967-11-16 Siemens Ag Druckwerk zum Abdruck von aus einer Vielzahl von Punkten zusammengesetzten Zeichen
US3372262A (en) * 1963-12-24 1968-03-05 Livshits Abram Lazarevich Hydrosolenoid unit for electroerosion machines
DE1806714A1 (de) * 1968-11-02 1970-06-25 Philips Electrologica Druckwerk zum fliegenden Abdrucken von Zeichen

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4010390A (en) * 1974-05-24 1977-03-01 Lucifer S.A. Electromagnetic actuator comprising a plunger core
US4157873A (en) * 1976-12-07 1979-06-12 Ricoh Co., Ltd. Dot printing apparatus
USRE31813E (en) * 1978-05-22 1985-01-22 Ledex, Inc. Print wire solenoid
US4200401A (en) * 1978-05-22 1980-04-29 Ledex, Inc. Print wire solenoid
US4272748A (en) * 1978-05-22 1981-06-09 Ledex, Inc. Print wire solenoid
US4308475A (en) * 1978-07-18 1981-12-29 Sundstrand Corporation Solenoid pump adapted for noiseless operation
US4211496A (en) * 1979-01-29 1980-07-08 Small Business Administration Printing solenoid
US4329921A (en) * 1979-08-20 1982-05-18 Siemens Aktiengesellschaft Damping device for an electromagnetically driven printing hammer
US4441830A (en) * 1982-03-29 1984-04-10 Ncr Corporation Printing solenoid
US4468142A (en) * 1982-11-12 1984-08-28 Genicom Corporation Pint wire actuator
US4523867A (en) * 1983-07-25 1985-06-18 Genicom Corporation Bi-directional drive print wire actuator with forward-velocity and reverse-position closed loop feedback control
US5071267A (en) * 1986-08-14 1991-12-10 U.S. Philips Corporation Actuation magnet for a printing stylus of a matrix printer
US5434459A (en) * 1993-11-05 1995-07-18 Magnetic Bearing Technologies, Inc. Pulsed power linear actuator and method of increasing actuator stroke force
US20080035871A1 (en) * 2006-08-09 2008-02-14 Shih Shin Technology Co., Ltd. Solenoid arrangement
US7431263B2 (en) * 2006-08-09 2008-10-07 Shin Shin Technology Co., Ltd. Solenoid arrangement

Also Published As

Publication number Publication date
AT327591B (de) 1976-02-10
SE380914B (sv) 1975-11-17
DE2119415A1 (de) 1973-01-18
FR2136583A5 (OSRAM) 1972-12-22
GB1343233A (en) 1974-01-10
IT957197B (it) 1973-10-10
NL7205172A (OSRAM) 1972-10-24
ATA349072A (de) 1975-04-15
CH548643A (de) 1974-04-30
DE2119415B2 (de) 1975-09-25

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