EP0022480A1 - Mécanisme d'actionnement électromagnétique pour marteaux d'impression - Google Patents

Mécanisme d'actionnement électromagnétique pour marteaux d'impression Download PDF

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Publication number
EP0022480A1
EP0022480A1 EP80103384A EP80103384A EP0022480A1 EP 0022480 A1 EP0022480 A1 EP 0022480A1 EP 80103384 A EP80103384 A EP 80103384A EP 80103384 A EP80103384 A EP 80103384A EP 0022480 A1 EP0022480 A1 EP 0022480A1
Authority
EP
European Patent Office
Prior art keywords
lever arm
arrangement according
hammer head
print hammer
hammer
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
EP80103384A
Other languages
German (de)
English (en)
Other versions
EP0022480B1 (fr
Inventor
Ho Chong Lee
David Howard Rickenbach
Jack Louis Zable
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
Priority to AT80103384T priority Critical patent/ATE3622T1/de
Publication of EP0022480A1 publication Critical patent/EP0022480A1/fr
Application granted granted Critical
Publication of EP0022480B1 publication Critical patent/EP0022480B1/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
    • 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
    • B41J9/127—Mounting of hammers
    • 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
    • B41J9/133—Construction of hammer body or tip

Definitions

  • the invention relates to an electromagnetically operable print hammer drive, consisting of a two-armed lever pivotable about an axis, one arm of which carries the print hammer head at its upper end and the other arm can be acted upon by an electromagnet.
  • This print hammer drive is to be used in high-speed printers.
  • a number of pressure hammers consist of a pivotable pressure hammer element in which the armature and hammer part are structurally combined with one another.
  • the anchor and hammer are designed as an integrated part in order to reduce costs and simplify production. Examples of such print hammers are described in US Pat. Nos. 3,177,803, 3,200,739, 3,349,696, 3,513,773, 3,705,370, 3,711,804, 3,714,892, 3,747,521 and in the following publications: IBM Technical Disclosure Bulletin, No. 11 (April 1974), pages 3529-3531 and No. 17 (August 1974), pages 780-781.
  • the object of the invention is to provide an improved print hammer drive, in particular for use in high-speed printers, which delivers a high impact energy on the print medium.
  • a holding device for the shaft preferably consisting of a permanent magnet, is provided, the strong magnetic attraction force of which rapidly decreases with distance. If the torque exerted by the electromagnet on the armature exceeds the holding force of the permanent magnet (the shaft is already bent at this point), the flexible shaft snaps away.
  • the anchor is provided with a nose, the movement of which is limited by a stop.
  • the stop is such that the anchor is stopped at the same time as the hammer strikes the pressure medium or shortly before.
  • the stop can also consist of a passive pole of the electromagnetic yoke.
  • the stop is provided with a cushion, the elastic properties of which are selected so that they essentially match the rebound properties of the printing medium. If the stop is designed so that it stops the movement of the armature at the beginning of the impact of the hammer head on the pressure medium, the hammer bounces back and reverses its direction of movement.
  • the print hammer head can move a little further forward and penetrate the print medium while the armature reverses its direction of movement before the print hammer head reverses upon rebounding. Then the print hammer head also follows the movement of the armature and moves away from the print medium, eliminating the possibility of double impact. This also keeps the contact time between the print hammer head and the print medium very short. Where the rebound properties of the cushion and print medium are matched to one another, the rebound movement of the print hammer head and the armature takes place essentially together, so that double stops are prevented. Since the anchor moves back a little earlier than the hammer head, the anchor also helps to reduce the contact time of the hammer.
  • the printing hammer unit contains a U-shaped magnetic yoke 10.
  • the working winding 11 is located on the lower leg 12 and extends beyond the pole face 13, which forms a working air gap with the armature.
  • the upper leg 14 is bevelled with its pole face 15 towards the end of the working winding 11.
  • the working winding 11 is electrically connected to an external (not shown) current source via the connections 16 and 17.
  • the print hammer unit further comprises a hammer element 18 which is pivotally mounted on the shaft 19 in addition to the pole face 15 of the upper yoke leg 14.
  • the anchor 20 of the hammer element 18 has a projection 21 which is aligned with the lower leg 12 of the yoke 10. This projection 21 is located essentially within the winding 11 and forms with the pole face 13 of the lower leg 12 a working air gap, which lies completely inside the working winding 11 during the rotary movement of the armature 20.
  • a second air gap is formed between the bevel 22 of the armature 20 and the beveled pole face 15 of the upper leg 14.
  • the slope 22 runs parallel to the pole face 15 in the most advanced position of the armature 20.
  • a hole 40 (FIG.
  • a stop lug 24 at the lower end of the armature 20 works on an armature stop, which preferably consists of a fixed block 25 with an arm 26.
  • the anchor stop is designed to limit the rotation of the armature 20 clockwise and to allow the armature to bounce back counterclockwise.
  • the block 25 lies in such a way that the projection 21 of the armature 20 cannot touch the pole face 13 of the lower leg 12.
  • a stop pad 27 made of a suitable material such as polyurethane is attached to the end of the arm 26.
  • the stop lug 24 hits this cushion 27, the elastic properties of which should essentially match the rebound characteristics of the pressure medium 31.
  • the anchor 20 and the hammer head 29 begin to bounce back essentially simultaneously when the impact on the cushion 27 and the pressure medium 31 takes place simultaneously.
  • the shaft 28 which carries a hammer head 29, runs upwards.
  • the front of the hammer head 29 has an impact surface 30 with which the medium 31 can be used against characters on a character carrier (e.g. a type tape) is struck.
  • a character carrier e.g. a type tape
  • a protrusion 32 over the hammer surface 30 causes a mass distribution so that the center of the effective impact mass and the shaft mass coincide more closely with the impact center. This makes the hammer less sensitive to double impacts and the rear part 33 serves to guide the hammer head 29.
  • the depth of the shank 28 is substantially reduced in relation to the anchor 20 and is slightly beveled from the anchor 20 to the base of the hammer head 29.
  • the shaft 28 is designed to be flexible and permits bending about the axis of rotation of the armature 20. The extent and degree of the bending can change depending on the operating parameters of the hammer system.
  • the degree of flexibility means that the impact mass (i.e. the hammer head 29) follows the anchor 20 with a delay and also oscillates relative to the anchor 20.
  • the oscillation period of the resonance frequency of the arrangement hammer / shaft / impact mass is chosen so that it is N + 1/2 oscillation periods during the time of free flight. This ensures that the impact mass hits the printing medium 31 when the hammer head 29 moves at the highest possible speed and thus delivers the greatest printing energy.
  • the hammer element 18 is made from a piece of magnetizable material.
  • the hammer head 29, the shaft 28 and the armature 20 are integrated into one part.
  • the depth of the shaft 28 with respect to the anchor 20 is also reduced. This reduces the total weight of the hammer element 18 and additionally gives the shaft 28 the desired flexibility act to allow bending of the shaft and movement of the hammer head independently of the anchor mass 20.
  • a stator block 38 which is preferably cast from plastic, is provided to accommodate several (in this case 5 pieces) yokes 10 at the same distance from one another. The distance between the yokes 10 corresponds to the distance between the printing positions in a line printer.
  • carrier arms 39 are arranged between the upper leg 14 of the yokes 10.
  • the support arms 39 are made of non-magnetic material such as. B. aluminum. Circular grooves 40 in the support arms 39 form a cutout 40 for the shaft 19.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Impact Printers (AREA)
  • Electronic Switches (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
EP80103384A 1979-07-11 1980-06-18 Mécanisme d'actionnement électromagnétique pour marteaux d'impression Expired EP0022480B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80103384T ATE3622T1 (de) 1979-07-11 1980-06-18 Elektromagnetischer druckhammerantrieb.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/056,486 US4269117A (en) 1979-07-11 1979-07-11 Electro-magnetic print hammer
US56486 1997-08-21

Publications (2)

Publication Number Publication Date
EP0022480A1 true EP0022480A1 (fr) 1981-01-21
EP0022480B1 EP0022480B1 (fr) 1983-06-01

Family

ID=22004718

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80103384A Expired EP0022480B1 (fr) 1979-07-11 1980-06-18 Mécanisme d'actionnement électromagnétique pour marteaux d'impression

Country Status (10)

Country Link
US (1) US4269117A (fr)
EP (1) EP0022480B1 (fr)
JP (1) JPS5615378A (fr)
AT (1) ATE3622T1 (fr)
AU (1) AU528596B2 (fr)
BR (1) BR8004295A (fr)
CA (1) CA1139004A (fr)
DE (1) DE3063597D1 (fr)
ES (1) ES8102915A1 (fr)
IT (1) IT1148842B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3307942A1 (de) * 1982-03-08 1983-09-22 Hewlett-Packard Co., 94304 Palo Alto, Calif. Druckhammer, vorzugsweise fuer einen schnelldrucker
EP0131300A1 (fr) * 1983-07-11 1985-01-16 Mannesmann Tally Corporation Imprimante de lignes à matrice de points
US4522122A (en) * 1983-05-03 1985-06-11 Ncr Canada Ltd - Ncr Canada Ltee Fast impact hammer for high speed printer

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4397234A (en) * 1981-12-30 1983-08-09 International Business Machines Corporation Electromagnetic print hammer coil assembly
US4703689A (en) * 1985-09-20 1987-11-03 International Business Machines Corporation Two lever print actuator with aligned pivots and energy transfer surfaces
US4756246A (en) * 1987-10-13 1988-07-12 International Business Machines Corporation Lubrication system for print hammer pivot pin
CA2040993C (fr) * 1990-04-25 2001-08-07 Yoshiaki Inoue Composition qui absorbe l'oxygene et methode de conservation d'un article grace a cette composition

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3459976A (en) * 1966-07-05 1969-08-05 Mohawk Data Sciences Corp Rotary electrodynamic driver
US3547028A (en) * 1968-02-02 1970-12-15 Sherwood Medical Ind Inc Vibratable platen means in selective printing machines
FR2313211A1 (fr) * 1975-06-02 1976-12-31 Mohawk Data Sciences Corp Dispositif de marteau balistique pour machine imprimeuse
FR2427202A1 (fr) * 1978-06-02 1979-12-28 Printronix Inc Mecanisme de frappe a marteau

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3195453A (en) * 1962-12-26 1965-07-20 Potter Instrument Co Inc Magnetically actuated print hammer
US3266418A (en) * 1963-12-02 1966-08-16 Anelex Corp Print hammer assembly for high speed printers
FR1501069A (fr) * 1965-09-30 1967-11-10 Olivetti General Electric Spa Module d'impression pour imprimante à grande vitesse
US3714892A (en) * 1970-10-20 1973-02-06 Odec Computer Syst Inc Impact hammer for liner printer
US3705370A (en) * 1971-04-15 1972-12-05 Ibm Magnetically actuated and restored print hammer
US3711804A (en) * 1971-04-15 1973-01-16 Ibm Magnetically restorable high speed print hammer
US3747521A (en) * 1971-06-25 1973-07-24 Ibm Low cost hammer unit
US3741113A (en) * 1971-06-25 1973-06-26 Ibm High energy print hammer unit with fast settle out
US3919933A (en) * 1973-10-05 1975-11-18 Potter Instrument Co Inc High speed printer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3459976A (en) * 1966-07-05 1969-08-05 Mohawk Data Sciences Corp Rotary electrodynamic driver
US3547028A (en) * 1968-02-02 1970-12-15 Sherwood Medical Ind Inc Vibratable platen means in selective printing machines
FR2313211A1 (fr) * 1975-06-02 1976-12-31 Mohawk Data Sciences Corp Dispositif de marteau balistique pour machine imprimeuse
FR2427202A1 (fr) * 1978-06-02 1979-12-28 Printronix Inc Mecanisme de frappe a marteau

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3307942A1 (de) * 1982-03-08 1983-09-22 Hewlett-Packard Co., 94304 Palo Alto, Calif. Druckhammer, vorzugsweise fuer einen schnelldrucker
US4522122A (en) * 1983-05-03 1985-06-11 Ncr Canada Ltd - Ncr Canada Ltee Fast impact hammer for high speed printer
EP0131300A1 (fr) * 1983-07-11 1985-01-16 Mannesmann Tally Corporation Imprimante de lignes à matrice de points

Also Published As

Publication number Publication date
ATE3622T1 (de) 1983-06-15
AU5901480A (en) 1981-01-15
CA1139004A (fr) 1983-01-04
EP0022480B1 (fr) 1983-06-01
US4269117A (en) 1981-05-26
ES493278A0 (es) 1981-02-16
DE3063597D1 (en) 1983-07-07
AU528596B2 (en) 1983-05-05
BR8004295A (pt) 1981-01-27
ES8102915A1 (es) 1981-02-16
JPS5615378A (en) 1981-02-14
JPH0331586B2 (fr) 1991-05-07
IT8022714A0 (it) 1980-06-11
IT1148842B (it) 1986-12-03

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