EP0113006A2 - Butée d'amortissement pour le dispositif d'entraînement du levier d'impression - Google Patents

Butée d'amortissement pour le dispositif d'entraînement du levier d'impression Download PDF

Info

Publication number
EP0113006A2
EP0113006A2 EP83111410A EP83111410A EP0113006A2 EP 0113006 A2 EP0113006 A2 EP 0113006A2 EP 83111410 A EP83111410 A EP 83111410A EP 83111410 A EP83111410 A EP 83111410A EP 0113006 A2 EP0113006 A2 EP 0113006A2
Authority
EP
European Patent Office
Prior art keywords
leg
print
coil
armature assembly
armature
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
EP83111410A
Other languages
German (de)
English (en)
Other versions
EP0113006A3 (en
EP0113006B1 (fr
Inventor
Richard Allen Lamos
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 EP0113006A2 publication Critical patent/EP0113006A2/fr
Publication of EP0113006A3 publication Critical patent/EP0113006A3/en
Application granted granted Critical
Publication of EP0113006B1 publication Critical patent/EP0113006B1/fr
Expired legal-status Critical Current

Links

Images

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
    • B41J9/42—Hammer-impression mechanisms with anti-rebound arrangements

Definitions

  • This invention relates to a print lever actuator mechanism and, more especially, such a mechanism wherein a critical air gap is maintained fixed without need for manual adjustement.
  • a print lever arm may be connected to the armature or it may be used as the armature itself so that a print element, which is located on the opposite side of the armature from the coil, may be propelled towards a print medium whenever the coil is energized.
  • the print element may be attached to the print lever arm or it may be positioned adjacent to but separated from the print lever arm. In the latter arrangement, upon energization of the coil the armature is attracted to the coil-wound section of the stator and the print lever arm is thrust forward striking the print element and causing it to impact the print medium.
  • a problem that arises in the use of electromagnetic actuators is that the dimension of the air gap, i.e., the distance between the armature and the coil wound stator must be maintained fixed. This distance is critical in order to insure that the armature and hence the print element is activated only when a predetermined amount of current is passed through the coil. If the air gap is allowed to vary, the armature may not energize when it should and conversely, may energize when it should not.
  • the present invention relates to a print lever actuating mechanism of the electromagnetic type.
  • a coil wound around one leg of a stator causes an armature assembly to be attracted to the coil wound leg when current is passed through the coil.
  • a print lever arm is connected to the armature such that when the coil is energized and the armature attracted to the coil wound leg, the print lever arm is thrust forward causing a print element to impact on a print medium.
  • the end of the armature adjacent to the coil wound leg is located the width of an air gap away from the leg.
  • the stator of the instant invention has three legs.
  • a coil is wound around a first leg of the stator.
  • the armature/print lever arm assembly pivots about the innermost leg of the stator.
  • the third leg of the stator functions as a backstop to limit the movement of the armature/print lever arm assembly such that the width of the air gap is maintained fixed.
  • the length of the third leg is determined by the width of the air gap that is required. As the air gap width increases, the length of the third leg correspondingly decreases.
  • a piece of molded rubber or other resilient material is mounted on the end of the third leg to absorb the force of the armature/print lever arm assembly as it rebounds after being thrust forward.
  • the print lever arm and armature may be formed in one piece so that the print lever arm is, in effect, the armature. Alternately, the print lever arm may be connected to the armature so that when the armature is activated, the print lever arm is likewise activated.
  • the three legs of the stator may be collinear or they may be offset from one another depending on the particular design of the printer.
  • Fig. 1 illustrates the print lever actuating mechanism of the instant invention.
  • a print lever actuating mechanism 24 of the electromagnetic type having armature 12 mounted atop stator 11.
  • Print lever arm 13 is shown connected to armature 12.
  • armature and print lever arm 13 may be formed in one piece or may be two separate pieces connected into one armature assembly 23 as shown.
  • Stator 11 comprises three separate legs 15-17.
  • Coil 19 is disposed about leg 17.
  • Armature assembly 23 pivots about leg 16 while backstop 14 is mounted on the end of leg 15.
  • Air gap 18 is the distance between the end of leg 17 and armature 12 when coil 19 is unenergized and print lever arm 13 is resting against backstop 14 on the end of leg 15.
  • Print wire 22 Upon energization of coil 19, by print control 27, print wire 22 is thrust forward to impact upon print medium 26.
  • Spring assembly 21 causes print wire 22 to rebound from the print medium.
  • Fig. 1 shows print wire 22, any type of print element that impacts a print medium may be employed to practice the instant invention.
  • armature 12 is constructed of a plurality of laminations of magnetic iron while print lever arm 13 is constructed of a one-piece section of spring steel.
  • Print lever arm 13 is connected to armature 12 by a plurality of small rivets not shown so as to form armature assembly 23.
  • Armature assembly 23 is then fastened to leg 16 at pivot point 25 using a plastic hinge (not shown).
  • One section of the plastic hinge is fastened to the underside of armature assembly 23 while the other section of the plastic hinge is fastened to the adjacent side of leg 16.
  • print lever actuating mechanism 24 When no information is desired to be printed, print lever actuating mechanism 24 is at rest and its position is as shown in Fig. 1. At this time, either no current is flowing through coil 19 or insufficient current is flowing through coil 19 to cause any movement of armature assembly 23 from the rest position. Armature 12 is separated from leg 17 by a distance equal to air gap 18. The width of air gap 18 is determined by the length of leg 15 at the time of manufacture. As the length of leg 15 is decreased, armature assembly 23 pivots about leg 16 so as to increase the width of air gap 18. Conversely, as the length of leg 15 is increased, the width of air gap 18 decreases. Since the length of leg 15 will not change after stator 11 has been manufactured, the width of air gap 18 remains fixed after actuating mechanism 24 has been assembled.
  • legs 16 and 17 are of equal length while leg 15 is of some length shorter than that of legs 16 and 17.
  • the exact length of leg 15 is determined by the width of air gap 18 that is desired.
  • An optimum range for the width of air gap 18 is 0,2/0,5 millimeters.
  • Stator 11 may be manufactured, for example, by grinding down legs 16 and 17 until the top surfaces, also known as the pole faces, which are adjacent to armature 12 lie in the same plane.
  • the top surface or pole face of leg 15 adjacent to print lever arm 13 may then be ground down to a predetermined distance below the plane of legs 16 and 17.
  • the thickness of backstop 14 must be taken into account when grinding down leg 15.
  • the sum of the thickness of backstop 14 and the length of leg 15 determines the width of air gap 18.
  • the width of air gap 18 is determined solely by the length of leg 15.
  • the preferred embodiment of the present invention comprises a ballistic type wire matrix printer wherein print wire 22 is used to print an information mark on a print medium. It will be recognized by those skilled in the art that any type of print element in any type of printer utilizing an electromagnetic actuator may be used to practice the instant invention. For example, a dot band or a chain printer using an electromagnetic actuator may be employed.
  • Backstop 14 which is composed of a resilient material such as rubber, absorbs the force of print lever arm 13 as it returns to its rest position. Further, the backstop material does not wear in the print actuator environment. Accordingly, the air gap 18 remains constant.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Impact Printers (AREA)
  • Electromagnets (AREA)
EP19830111410 1982-12-29 1983-11-15 Butée d'amortissement pour le dispositif d'entraînement du levier d'impression Expired EP0113006B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US45430682A 1982-12-29 1982-12-29
US454306 1982-12-29

Publications (3)

Publication Number Publication Date
EP0113006A2 true EP0113006A2 (fr) 1984-07-11
EP0113006A3 EP0113006A3 (en) 1986-08-20
EP0113006B1 EP0113006B1 (fr) 1989-03-08

Family

ID=23804112

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830111410 Expired EP0113006B1 (fr) 1982-12-29 1983-11-15 Butée d'amortissement pour le dispositif d'entraînement du levier d'impression

Country Status (3)

Country Link
EP (1) EP0113006B1 (fr)
JP (1) JPS59123678A (fr)
DE (1) DE3379325D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4852481A (en) * 1988-07-14 1989-08-01 L. James Hubbard Print hammer mechanism
WO2010127671A2 (fr) 2009-05-06 2010-11-11 Institut Für Luft- Und Kältetechnik Gemeinnützige Gmbh Procédé de stockage de gaz techniques et réservoir de gaz techniques

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4230412A (en) * 1978-03-17 1980-10-28 Helmut Falk Matrix print head assembly
US4260270A (en) * 1978-09-11 1981-04-07 Honeywell Information Systems Italia Mosaic printing head

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2800218C2 (de) * 1978-01-04 1980-02-07 Triumph Werke Nuernberg Ag, 8500 Nuernberg Nadeldruckkopf
JPS5722073A (en) * 1980-07-15 1982-02-04 Nec Corp Spring charge type printing hammer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4230412A (en) * 1978-03-17 1980-10-28 Helmut Falk Matrix print head assembly
US4260270A (en) * 1978-09-11 1981-04-07 Honeywell Information Systems Italia Mosaic printing head

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4852481A (en) * 1988-07-14 1989-08-01 L. James Hubbard Print hammer mechanism
WO2010127671A2 (fr) 2009-05-06 2010-11-11 Institut Für Luft- Und Kältetechnik Gemeinnützige Gmbh Procédé de stockage de gaz techniques et réservoir de gaz techniques

Also Published As

Publication number Publication date
JPS59123678A (ja) 1984-07-17
EP0113006A3 (en) 1986-08-20
DE3379325D1 (en) 1989-04-13
EP0113006B1 (fr) 1989-03-08

Similar Documents

Publication Publication Date Title
US4674896A (en) Printing mechanism for an impact matrix printer
US7927031B2 (en) Impact printhead
US4802776A (en) Print head having a wear resistant rotational fulcrum
US4209260A (en) Wire matrix print head having reversible wire drive armatures to allow wire wear compensation
US3741113A (en) High energy print hammer unit with fast settle out
CA1108470A (fr) Element de frappe pour imprimante
US4661002A (en) Dot matrix printer
EP0155816A2 (fr) Tête d'impression par points
US4049108A (en) Actuator for a matrix print head
EP0113006B1 (fr) Butée d'amortissement pour le dispositif d'entraînement du levier d'impression
EP0156547A1 (fr) Tête d'impression par points
US4004505A (en) Electromagnetic striker mechanism for a printer
US3748613A (en) Print device for a printer
EP0028539A2 (fr) Ensemble de marteau d'impression
US3968744A (en) Self-damping unitary print hammer for high speed printers
US4242004A (en) Dot matrix printhead driver
US4634303A (en) Actuator for dot matrix printhead
US4401026A (en) Free flight hammer for impact printer
US4548522A (en) Print head for a dot matrix printer
US3453572A (en) Curving flexure-armature
EP0343965B1 (fr) Tête d'impression par points à impact
US4121518A (en) High speed printer hammer assembly
EP0191549B1 (fr) Tête d'impression par points utilisant des fils
US5209585A (en) Print head for a dot matrix printer
JPS6040991B2 (ja) ワイヤドツトヘツド

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19841029

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB

17Q First examination report despatched

Effective date: 19880210

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REF Corresponds to:

Ref document number: 3379325

Country of ref document: DE

Date of ref document: 19890413

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19911008

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19911028

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19911118

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19921115

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19921115

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19930730

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19930803

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST