EP0400390A2 - Méthode et dispositif pour le positionnement d'un organe d'entraînement dans une machine à écrire ou machine de bureau similaire - Google Patents

Méthode et dispositif pour le positionnement d'un organe d'entraînement dans une machine à écrire ou machine de bureau similaire Download PDF

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Publication number
EP0400390A2
EP0400390A2 EP90109083A EP90109083A EP0400390A2 EP 0400390 A2 EP0400390 A2 EP 0400390A2 EP 90109083 A EP90109083 A EP 90109083A EP 90109083 A EP90109083 A EP 90109083A EP 0400390 A2 EP0400390 A2 EP 0400390A2
Authority
EP
European Patent Office
Prior art keywords
signal
counter
clock
motor
control device
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Withdrawn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
EP90109083A
Other languages
German (de)
English (en)
Other versions
EP0400390A3 (fr
Inventor
Didrich Janssen
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.)
AEG Olympia Office GmbH
Original Assignee
AEG Olympia AG
AEG Olympia Office GmbH
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 AEG Olympia AG, AEG Olympia Office GmbH filed Critical AEG Olympia AG
Publication of EP0400390A2 publication Critical patent/EP0400390A2/fr
Publication of EP0400390A3 publication Critical patent/EP0400390A3/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Withdrawn legal-status Critical Current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
    • B41J1/00—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies
    • B41J1/22—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection
    • B41J1/24—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection the plane of the type or die face being perpendicular to the axis of rotation

Definitions

  • the invention relates to a method for position control of an output part in a typewriter or office machine of a similar type of the type specified in the preamble of claim 1.
  • DC motors are used in many devices these days to bring parts into specific positions. For example, in the case of writing and printing units such as the carriage, the type wheel, the platen and a number of other devices, they are positioned using DC motors. The rotors of these DC motors are firmly connected to clock disks which can be scanned by a scanning device in order to generate counting pulses.
  • the invention has for its object to provide a method and a circuit arrangement for position control of a driven by a DC motor driven part in a typewriter or similar office machine, such that any vibrations of the clock disk occurring after the stepping operations do not lead to step counting errors in the counter.
  • This object is achieved by the features characterized in claim 1.
  • this signal does not change when the encoder signal swings around an edge. As a result, no additional pulses are counted in the simplest way when the clock disk overshoots.
  • the mechanical range for vibrations is increased without counting errors.
  • FIG. 1 shows a direct current motor 1, on the drive shaft 2 of which a timing disk 3 with translucent slots 4 is evenly distributed over the circumference. These slots 4 are scanned by a light barrier arrangement 5 designed as a position sensor with a light source 6 and two light receivers 7, 8 which, when the clock disk rotates 3 pulses via an evaluation circuit 9 and a delay element 10 to a counter 11 for counting in a positive or negative direction deliver.
  • This counter 11 is in a known manner in an alternating connection with a control device 12, which these signals for evaluation, in particular for position control of the driven part driven by the DC motor 1, not shown, for.
  • B. a rotatably mounted type plate or a longitudinally movable carriage.
  • the DC motor 1 is connected to the control device via a bridge circuit 13 12 controlled. If the DC motor 1 is set in rotation by the control device 12 from the standstill of the current supply from the bridge circuit 13, the direction of rotation is determined by the control device 12. The positive and negative direction of rotation is determined by a direction of rotation discriminator 14, which receives corresponding light barrier signals from the evaluation circuit 9. The signal 15 emitted by the direction of rotation discriminator 14 is evaluated in the counter 11 as a control criterion for the counting of the pulses received from the light barrier arrangement 5 in a positive or negative direction, so that the number in the counter 11 indicates the position for the type plate moved by the direct current motor 1 or the carriage moved by the DC motor is clearly determined.
  • the double light barrier arrangement 5 serving as a position sensor or encoder is arranged in a U-shaped bearing block 16, the light source 6 being arranged in one arm 17 and the two light receivers 7, 8 in the other arm 18 of the bearing block 16.
  • the bearing block 16 is firmly connected to a control board on which the control device 12 for the DC motor 1 is also arranged.
  • the clock disk 3 is rotatably arranged in a recess between the two arms 17, 18.
  • the scanning of the clock disk 3 can also by other means, for. B. by electrical contact. Since the clock disk 3 rotates synchronously with the drive motor 1, one obtains a statement about the position of the driven part, for. B. a type plate.
  • FIG. 2 shows a circuit arrangement by means of which oscillation of the clock disk 3 in an extended area no longer leads to an incorrect count result in the counter 11.
  • the clock signal 19 generated by the clock disc 2 is inverted via the NAND element 21 and the flip-flop consisting of the NAND elements 22 and 26 is set with a positive input signal 19 and then supplied to the counter 11 as a count signal 23.
  • a directional signal 20 which is phase-shifted by 900 with respect to the clock signal 19, is generated via the light barrier arrangement that scans the clock disc, and is generated via an edge detector consisting of the exclusive-OR elements 24, 27, 28, 29 and a NAND element 25 serving as an inverter , the flip-flop (22, 26) resets on a switching edge on the signal 20 when signal 19 is no longer positive.
  • the count signal is present longer, in such a way that oscillations of the clock disk do not lead to incorrect counts of the counter.
  • the direction of rotation signal 31 is used in the control device 12, whereby the counter 11 can then be reversed accordingly.
  • FIG. 3 shows the diagrams of the signal profiles, the signals generated by the clock disk 3 being shown in FIGS. 3a and 3b.
  • 3a shows the course of the direction signal and
  • FIG. 3b shows the course of the count signal
  • FIGS. 3c and 3d show the time courses of the counting clock 23 with output clocks in directions 32 and 33.
  • FIGS. 3c and 3d clearly show the extension of the active holding of the counting signals 23 supplied to the counter 11 compared to the duration of the active holding of the clock signals 19 generated by the clock disk 3 no longer trigger counting errors in the counter 11.

Landscapes

  • Character Spaces And Line Spaces In Printers (AREA)
  • Control Of Stepping Motors (AREA)
EP19900109083 1989-06-02 1990-05-15 Méthode et dispositif pour le positionnement d'un organe d'entraínement dans une machine à écrire ou machine de bureau similaire Withdrawn EP0400390A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19893918071 DE3918071A1 (de) 1989-06-02 1989-06-02 Verfahren und schaltungsanordnung zur lagesteuerung eines abtriebsteiles in einer schreib- oder bueromaschine aehnlicher bauart
DE3918071 1989-06-02

Publications (2)

Publication Number Publication Date
EP0400390A2 true EP0400390A2 (fr) 1990-12-05
EP0400390A3 EP0400390A3 (fr) 1991-06-05

Family

ID=6381967

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900109083 Withdrawn EP0400390A3 (fr) 1989-06-02 1990-05-15 Méthode et dispositif pour le positionnement d'un organe d'entraínement dans une machine à écrire ou machine de bureau similaire

Country Status (2)

Country Link
EP (1) EP0400390A3 (fr)
DE (1) DE3918071A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101930013B (zh) * 2009-06-25 2012-05-23 华为技术有限公司 转向检测方法及转向检测电路

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3143310B2 (ja) * 1994-02-25 2001-03-07 三菱電機株式会社 位置検出装置、補正機能付位置検出装置、位置検出方法、および、位置検出装置の補正方法
JP5694481B1 (ja) 2013-10-30 2015-04-01 ファナック株式会社 主軸とモータとの間の動力伝達部の異常を検出するモータ制御装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3206683A (en) * 1961-02-10 1965-09-14 Westinghouse Electric Corp Signal sequence sensing apparatus
US3701104A (en) * 1968-09-06 1972-10-24 Singer Co Address synchronizer
US3622763A (en) * 1969-07-08 1971-11-23 Houdaille Industries Inc Incremental numerical control
US4305674A (en) * 1977-02-09 1981-12-15 Sycor, Inc. Lateral position control means for data printer heads
GB1603682A (en) * 1977-05-31 1981-11-25 Nippon Electric Co Position control system
US4343012A (en) * 1980-12-30 1982-08-03 International Business Machines Corporation Printer control circuit
DE3214554C2 (de) * 1982-04-20 1986-08-14 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung zur Bestimmung der Position von Schreibwerken in Druckern mit einem Gleichstrommotor
US4541746A (en) * 1983-10-14 1985-09-17 International Business Machines Corporation Initializing apparatus for daisy wheel printer
JPS62292471A (ja) * 1986-06-12 1987-12-19 Nec Corp 印字位置調整装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101930013B (zh) * 2009-06-25 2012-05-23 华为技术有限公司 转向检测方法及转向检测电路

Also Published As

Publication number Publication date
DE3918071A1 (de) 1990-12-06
EP0400390A3 (fr) 1991-06-05

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