EP0189568A1 - Druckhammer und Antrieb für Typenraddrucker - Google Patents

Druckhammer und Antrieb für Typenraddrucker Download PDF

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Publication number
EP0189568A1
EP0189568A1 EP19850115703 EP85115703A EP0189568A1 EP 0189568 A1 EP0189568 A1 EP 0189568A1 EP 19850115703 EP19850115703 EP 19850115703 EP 85115703 A EP85115703 A EP 85115703A EP 0189568 A1 EP0189568 A1 EP 0189568A1
Authority
EP
European Patent Office
Prior art keywords
armature
hammer
magnet
legs
core member
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.)
Withdrawn
Application number
EP19850115703
Other languages
English (en)
French (fr)
Inventor
Albert Lee Akers
William Richard Yount
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of EP0189568A1 publication Critical patent/EP0189568A1/de
Withdrawn legal-status Critical Current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
    • B41J9/00—Hammer-impression mechanisms
    • B41J9/26—Means for operating hammers to effect impression
    • B41J9/38—Electromagnetic means
    • 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
    • B41J9/02—Hammers; Arrangements thereof
    • B41J9/04—Hammers; Arrangements thereof of single hammers, e.g. travelling along printing line
    • B41J9/06—Hammers; Arrangements thereof of single hammers, e.g. travelling along printing line of stationary hammers, e.g. engaging a single type-carrier

Definitions

  • the invention relates to the field of print assemblies and in particular print assemblies for daisy wheel printing mechanism.
  • magnets In daisy wheel printers having a multi-spoked wheel, each carrying a character type face, magnets have heretofore been used to create the impact between the typefont and the record page. Magnets of many different types have been used to accomplish this impacting.
  • a magnet assembly which has a core or moving armature where the magnet is aligned with the print position and is the core of the solenoid, which is magnetically driven to physically impact the print element is one type of magnet used to create the impacting. This type magnet assembly is typically referred to as a ballistic hammer.
  • Magnets with a moving armature which extends from the coil have likewise been used to act against a movable hammer member, thus projecting the hammer into impacting contact with the print element.
  • a third type arrangement involves a clapper type magnet wherein the clapper is attracted toward the magnet structure and the clapper through a physical extension thereof acts against and pushes a hammer toward the print element.
  • GB-A-993,833 illustrates a print hammer arrangement wherein the appendage is attracted to the magnet and also shows the very small degree of travel which the hammer has in this type assembly.
  • the appendage is generally planar in shape and lies in a plane substantially perpendicular to the oscillatory axis of the print hammer.
  • the magnet comprises a magnet armature and a coil surrounding at least a portion of the magnet armature, the latter being formed to have a first and second end portions extending outwardly from said coil and forming a magnetic path into which said appendage may be attracted.
  • the magnet armature forms a U shape and the legs thereof form a span of the magnetic path into which the hammer appendage may be attracted.
  • the complementary construction of the hammer armature and the magnet armature allow a longer throw or stroke of the hammer armature as it is magnetically attracted by the magnet while at the same time maintaining a more uniform force exerted on the hammer armature throughout its movement.
  • the printing assembly is comprised of an electromagnet assembly 10 and a hammer assembly 12 which constitutes an impact element for impacting a print element 50.
  • Magnet assembly 10 is comprised of an armature 14 further comprising legs 16. The legs 16 are formed or bent to be substantially perpendicular to the central member of the armature 14. Magnetically coupled and positioned within the channel formed by the U-shaped armature 14 is core member 18.
  • Core member 18 is fashioned from a permeable iron mass and is magnetically coupled to, by side to side contact with, the armature 14.
  • the length of core member 18 is fashioned to leave a small gap 20 on each end thereof between legs 16 and core member 18.
  • Core member 18 is likewise fashioned such that its dimensions cause the outer surface thereof to coincide approximately with the length of legs 16. The insertion of core member 18 into the channel of the U-shaped armature 14 tends to concentrate flux flow through gaps 20 from the legs 16 of armature 14 which acts as the poles thereof.
  • the core member 18 and the armature 14 could, if desired, be fabricated as a single unitary piece.
  • Wrapped around armature 14 and core member 18 is a coil of wire 22 which may be energized to create the magnetic field to attract the hammer armature 24.
  • the hammer armature 24 is formed as a magnetically permeable appendage depending from and formed as a part of the hammer assembly 12.
  • the hammer armature 24 is a relatively light weight thin piece of material formed in a U-shaped channel.
  • the U-shaped channel is comprised of a span 26 and legs 28 extending from said span 26.
  • the legs 28 are perpendicular to span 26, spaced apart substantially the width of said span 26, and of sufficient length to extend into gaps 20 but to prevent span 26 from contacting coil 22 or core member 18 when fully attracted by the magnet assembly 10.
  • the tips of legs 28 of the hammer armature 24 are approximately aligned with the tip of the magnet armature 16. Since gap 20 is formed by legs 16 and core member 18 and each extend substantially the same distance from the central hammer of armature 14, the flux path is caused to deviate only slightly between legs 16 and core member 18 in order to pass through leg 28 of the hammer armature 24.
  • Each air gap between leg 16 and leg 28 and leg 28 and core member 18 is preferably in the order of .010 inch or approximately .25 mm.
  • Electromagnet assembly 10 may be mounted on a carrier 38 which supports hammer 34 by way of the pivot shaft 36 and will require only positioning such that' the ends of the legs 28 approximately align centered between the legs 16 of the armature. Mounting of the electromagnet assembly 10 may be accomplished by attaching it to the carrier 38 through mounting tabs 40 or other conventional means.
  • Fig. 3 is a force displacement diagram which illustrates the magnetic forces being exerted onto a clapper type armature and the forces exerted upon the hammer armature 24 of the instant invention.
  • Curve 42 represents a clapper type construction and the forces represented are typical of that type magnet structure.
  • the force ' exerted by the magnet on the armature is a very weak force as indicated by region 44 on curve 42.
  • the force increases exponentially until a maximum force is exerted at the point immediately prior to the clapper armature contacting or sealing to the magnet structure. Due to the exceeding short travel of the clapper, adjustments are very critical to secure an adequate impacting force while at the same time preventing the clapper from sealing so that a large secondary opposite acting force may not be required to cause the clapper to release.
  • Curve 46 is representative of the forces exerted upon the hammer armature as described in this specification at differing distances of displacement from the electromagnet assembly 10.
  • the force exerted upon the hammer armature 24 at a rest position corresponding to something in the order of .250 to .300 inch (approximately 6,25 to 7,6 mm) displacement from the fully attracted position illustrates that a substantially larger force applied over a much longer travel is available to store substantially greater amounts of energy in the hammer for dissipation at impact.
EP19850115703 1985-01-28 1985-12-10 Druckhammer und Antrieb für Typenraddrucker Withdrawn EP0189568A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US69559885A 1985-01-28 1985-01-28
US695598 1991-05-03

Publications (1)

Publication Number Publication Date
EP0189568A1 true EP0189568A1 (de) 1986-08-06

Family

ID=24793674

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850115703 Withdrawn EP0189568A1 (de) 1985-01-28 1985-12-10 Druckhammer und Antrieb für Typenraddrucker

Country Status (2)

Country Link
EP (1) EP0189568A1 (de)
JP (1) JPS61173968A (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3714892A (en) * 1970-10-20 1973-02-06 Odec Computer Syst Inc Impact hammer for liner printer
US4004505A (en) * 1973-11-06 1977-01-25 Compagnie Honeywell Bull (Societe Anonyme) Electromagnetic striker mechanism for a printer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3714892A (en) * 1970-10-20 1973-02-06 Odec Computer Syst Inc Impact hammer for liner printer
US4004505A (en) * 1973-11-06 1977-01-25 Compagnie Honeywell Bull (Societe Anonyme) Electromagnetic striker mechanism for a printer

Also Published As

Publication number Publication date
JPS61173968A (ja) 1986-08-05

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

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Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19861125

17Q First examination report despatched

Effective date: 19880226

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19880907

RIN1 Information on inventor provided before grant (corrected)

Inventor name: AKERS, ALBERT LEE

Inventor name: YOUNT, WILLIAM RICHARD