EP0318449A2 - Méthode et disposition pour commander l'opération d'une imprimante matricielle - Google Patents

Méthode et disposition pour commander l'opération d'une imprimante matricielle Download PDF

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Publication number
EP0318449A2
EP0318449A2 EP88850387A EP88850387A EP0318449A2 EP 0318449 A2 EP0318449 A2 EP 0318449A2 EP 88850387 A EP88850387 A EP 88850387A EP 88850387 A EP88850387 A EP 88850387A EP 0318449 A2 EP0318449 A2 EP 0318449A2
Authority
EP
European Patent Office
Prior art keywords
armature
magnetomotive force
needle
during
anvil
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Withdrawn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
EP88850387A
Other languages
German (de)
English (en)
Other versions
EP0318449A3 (fr
Inventor
Olli Olavi Salminen
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.)
Facit AB
Original Assignee
Facit AB
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 Facit AB filed Critical Facit AB
Publication of EP0318449A2 publication Critical patent/EP0318449A2/fr
Publication of EP0318449A3 publication Critical patent/EP0318449A3/fr
Withdrawn legal-status Critical Current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
    • B41J9/42—Hammer-impression mechanisms with anti-rebound arrangements
    • 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
    • B41J2/30—Control circuits for actuators

Definitions

  • the present invention relates to a method for controlling the method of operation of a matrix printer.
  • the invention relates to a method for controlling the method of operation of a matrix printer of the kind which includes a printing head which is located in front of a printing anvil and is reciprocatingly movable in a direction substantially paral­lel with the anvil and which incorporates a plurality of printing needles each of which is capable of being maneuve­red individually with the aid of a respective electromagne­tic maneuvering device by means of which, when said device is activated, the needle, carried by a spring-biassed, movable armature, can be caused to carry out a working cycle which includes a working stroke, during which the needle is moved in a direction towards the anvil such as to print a punctiform symbol or some other graphic symbol on a record carrier located in front of the anvil, and a subse­quent return stroke, during which the needle is returned to a withdrawn rest position, wherewith activation of the maneuvering device is effected by temporary pronounced lowering of the magnetomotive force in the magnetic circuit of the
  • the inventive method proposed to this end is characterized primarily by braking the armature during the final stage of its return movement, by further lowering the magnetomotive force temporarily in said magnetic circuit.
  • the further temporary lowering of the magnetomotive force can be controlled, for instance, in dependence on the result obtained when monitoring or observing the method of operation of the armature during a printing operation. Furthermore, said further temporary lowering of the magne­tomotive force can be controlled suitably with respect to the time at which it is commenced and/or the extent of its duration.
  • the invention also relates to an arrangement for control­ling the method of operation of a matrix printer of the kind disclosed in the introduction.
  • the characterizing fea­tures of this arrangement are set forth in Claims 5-8.
  • the reference numeral 10 identifies generally an electro-magnetic device for maneuvering a printing needle or pin 11 of a matrix printer of the kind disclosed in the introduction.
  • the needle 11 is rigidly mounted on one end of an arm 12, the other end of which is pivotally mounted on a pivot shaft 13.
  • the requisite pivotal movement of the arm 12 can be obtained by means of an arm which comprises a springy, flexible element which is firmly attached at one end thereof and which exhi­ bits along the major part of its length a stiffening 12′ consisting of magnetic material.
  • the arm 12 forms a movable armature on the device 10, the magnetic circuit of which also includes a stationary, U-shaped part 14 made of magnetic material and having two windings 15 and 16 arranged thereon.
  • the reference numeral 17 identifies a thrust or pressure spring which is arranged between a rigid spring abutment 18 and the armature 12 and which strives to swing the armature 12 away from the stationary part 14 of the magnetic cir­cuit.
  • this spring can be replaced with a spring bias which is found incorporated intrinsi­cally in a resilient or spring part of the armature and which endeavours to hold the armature at a distance from the stationary part 14.
  • a constant current I0 is fed continuously through the winding 15 while the printer is in operation. This current is sufficiently high to hold the armature 12 in the illustrated, attracted position of abutment with a stop member 19, in spite of the spring bias acting on said armature.
  • the illustrated printing needle 11 and maneuvering device 10 are included, together with a plurality of further need­les and associated maneuvering devices, in a printing head of the printer, said head being movable reciprocatingly along a printing anvil or like counterforce surface 20 in a direction at least substantially parallel with the anvil. All printing needles can be maneuvered individually, so as to provide a punctiform print or the print of some other graphic symbol on a record carrier 21 located in front of the anvil 20.
  • the record carrier 21 will consist normally of paper web on which a needle is able to print a symbol with the aid of a carbon ribbon or some like aid.
  • the maneuvering device 10 When the illustrated needle 11 is to print a symbol on the carrier 21, the maneuvering device 10 is activated, by sending a short current pulse i1 through the winding 16. This current pulse produces a brief but pronounced lowering of the resulting magnetomotive force in the magnetic cir­cuit formed by the armature 12 and the stationary part 14. In response to the spring bias acting thereon, the armature will commence to move therewith in a direction away from the part 14 and towards the printing anvil 20 while forming a progressively increasing air gap between the armature and said part.
  • the aforesaid current pulse i1 in the winding 16 can be generated with the aid of the combined drive and monitoring circuit illustrated in Figure 2.
  • one end of the winding 16 is connected to the connection point between a switch 23 connected to conductor 22 on which a positive potential is applied and diode 25 which is connected to a conductor 24 of earth potential and which is provided with a resistor 26 which is coupled in parallel across the diode.
  • the other end of the winding 16 is con­nected to the connection point between a diode 27 connected to the conductor 22 with a switch 28 connected to the con­ ductor 24.
  • Each of the switches 23 and 28 consists of a steerable electronic switch, e.g. an MOS-transistor.
  • the circuit illustrated in Figure 2 also functions to enable movement of the needle 11 to be monitored during a working cycle, this working cycle comprising a working stroke and a return stroke of the needle.
  • This monitoring process is achieved by detecting those changes in the mag­netic flux in the magnetic circuit formed by the stationary part 14 and the armature 12 during the common movement of said needle and armature which take place as a result of the consequentially occurring change in the length of the air gap between the part 14 and the armature 12.
  • the winding 16 which serves to produce the drive pulse i1 is utilized as the sensor means for sensing the aforesaid flux changes.
  • the flux changes engendered in the winding 16 by movement of the armature will give rise to an electromotive force which is direclty proportional to the time derivative of the magnetic flux in the magnetic circuit.
  • the electromotive force generated in the winding is well suited for use in determining both the time point t1 of the needle 11 and the transition of the armature 12 from a working stroke to a return stroke and also the time point t2 at which the armature arrives back at its starting position at the end of a working cycle.
  • This determination of said two time points is effected with the aid of a detector which is connected to the winding 16 and which comprises a transistor 29 and two resistors 30 and 31. Obtained on the output 32 of the detector is a voltage u d which has the configuration shown in Figure 3 and from which both time points t1 and t2 can be read.
  • the information thus obtained in respect of the time points t1,and t2 is utilized to slow down the armature during the final stage of the return movement of the arma- ture to its starting position with the aid of control means included in the printer, such that the armature will have a much slower speed when it reaches its starting position.
  • This braking of the armature is achieved by generating a further pulse i2 in the winding 16 during a selected part of the time taken for the armature to return to its start­ing position, as illustrated in chain lines in Figure 3.
  • This further current pulse results in a temporary lowering of the magnetomotive force in the magnetic circuit of the maneuvering device 10 and therewith damping or braking of armature movement.
  • the current pulse which functions as an armature movement damping pulse is preferably not generated until the print­ing needle, during a first working cycle, has performed an undampened movement with subsequent rebound, in accordance with the unbroken line s in Figure 3.
  • the two time points t1 and t2 of this working cycle are then established and are subsequently utilized in controlling the generation of the damping pulse i2 during subsequent working cycles.
  • the needle can be caused to move along the curve s′ shown in chain lines in Figure 3.
  • the damping pulse i2 need not be supplied through the same winding as the drive pulse i1, but may instead con­ceivably be supplied through another winding disposed on the stationary part 14.

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  • Impact Printers (AREA)
EP88850387A 1987-11-23 1988-11-09 Méthode et disposition pour commander l'opération d'une imprimante matricielle Withdrawn EP0318449A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8704631 1987-11-23
SE8704631A SE462081B (sv) 1987-11-23 1987-11-23 Saett och anordning foer styrning av arbetssaettet hos en naalskrivare

Publications (2)

Publication Number Publication Date
EP0318449A2 true EP0318449A2 (fr) 1989-05-31
EP0318449A3 EP0318449A3 (fr) 1989-07-26

Family

ID=20370351

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88850387A Withdrawn EP0318449A3 (fr) 1987-11-23 1988-11-09 Méthode et disposition pour commander l'opération d'une imprimante matricielle

Country Status (3)

Country Link
EP (1) EP0318449A3 (fr)
JP (1) JPH02533A (fr)
SE (1) SE462081B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002049847A1 (fr) * 2000-12-20 2002-06-27 Axiohm Transaction Solutions, Inc. Procede servant a limiter le bruit d'une imprimante a impact

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3463495B2 (ja) * 1996-11-07 2003-11-05 豊田工機株式会社 動力舵取装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2238605A1 (de) * 1972-08-05 1974-02-21 Vierling Oskar Steueranordnung fuer impulsbetaetigte magnetantriebssysteme
US4273039A (en) * 1979-08-03 1981-06-16 Hewlett Packard Company Impact printing apparatus and method using reluctance switching and a closed loop drive system
US4348119A (en) * 1980-11-06 1982-09-07 General Electric Company Bounce control system for moving coil printing element
GB2195481A (en) * 1986-09-16 1988-04-07 Canon Kk Impact type recording apparatus
US4744684A (en) * 1985-11-05 1988-05-17 Canon Kabushiki Kaisha Impact-type recording apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2238605A1 (de) * 1972-08-05 1974-02-21 Vierling Oskar Steueranordnung fuer impulsbetaetigte magnetantriebssysteme
US4273039A (en) * 1979-08-03 1981-06-16 Hewlett Packard Company Impact printing apparatus and method using reluctance switching and a closed loop drive system
US4348119A (en) * 1980-11-06 1982-09-07 General Electric Company Bounce control system for moving coil printing element
US4744684A (en) * 1985-11-05 1988-05-17 Canon Kabushiki Kaisha Impact-type recording apparatus
GB2195481A (en) * 1986-09-16 1988-04-07 Canon Kk Impact type recording apparatus

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 21, no. 11, April 1979, pages 4454-4456, New York, US; R.W. ARNOLD et al.: "Control of rebound energy in a coil-actuated hammer" *
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 22, no. 10, March 1980, page 4348, New York, US; A.B. HABICH: "Print hammer rebound control" *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002049847A1 (fr) * 2000-12-20 2002-06-27 Axiohm Transaction Solutions, Inc. Procede servant a limiter le bruit d'une imprimante a impact

Also Published As

Publication number Publication date
EP0318449A3 (fr) 1989-07-26
SE8704631L (sv) 1989-05-24
SE462081B (sv) 1990-05-07
JPH02533A (ja) 1990-01-05
SE8704631D0 (sv) 1987-11-23

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