EP0400390A2 - Methode and apparatus for positioning a driving element in a typewriter or similar office machine - Google Patents

Methode and apparatus for positioning a driving element in a typewriter or similar office machine 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
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EP
European Patent Office
Prior art keywords
signal
counter
clock
motor
control device
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Application number
EP90109083A
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German (de)
French (fr)
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EP0400390A3 (en
Inventor
Didrich Janssen
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AEG Olympia Office GmbH
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AEG Olympia AG
AEG Olympia Office GmbH
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Publication of EP0400390A2 publication Critical patent/EP0400390A2/en
Publication of EP0400390A3 publication Critical patent/EP0400390A3/en
Withdrawn legal-status Critical Current

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    • 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.

Abstract

In typing and printing mechanisms DC motors are often also used today, their driveshafts being provided with timing discs which via a sensing device provide for every step carried out a pulse for a control device with a counter. In this process, it may occur that the DC motor with the timing disc vibrates backwards and forwards after a step process in such a way that the counter is loaded with a plurality of counting pulses. These incorrect counts are avoided according to the invention by providing a control element which keeps the signal supplied to the counter (11) at an active level longer than the clock signal which triggers this signal and is generated by the timing disc (3). As a result, the mechanical range for vibrations is increased without counting errors occurring. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zur Lagesteuerung eines Abtriebsteiles in einer Schreib- oder Büromaschine ähnlicher Bauart der im Oberbegriff des Patentanspruchs 1 angegebenen Art.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.

Gleichstrommotore werden heutzutage bei vielen Geräten verwendet, um Teile in bestimmte Positionen zu bringen. So werden beispiels­weise bei Schreib- und Druckwerken, wie der Wagen, das Typenrad, die Schreibwalze und eine Reihe anderer Einrichtungen, mit Hilfe von Gleichstrommotoren positioniert. Die Rotoren dieser Gleich­strommotore sind mit Taktscheiben fest verbunden, welche zur Erzeugung von Zählimpulsen durch eine Abtastvorrichtung abtastbar sind.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.

Bei diesem durch den mechanischen Taktgeber erzeugten Signal, das gezählt werden soll, indem nur auf eine Flanke reagiert wird, besteht immer das Problem, daß beim Schwingen um diese Flanke mehrmals eine positive bzw. negative Flanke von dem Zähler ge­zählt wird.With this signal generated by the mechanical clock, which is to be counted by reacting to only one edge, there is always the problem that a positive or negative edge is counted several times by the counter when oscillating around this edge.

Auch wenn ein um 90 Grad phasenverschobenes Signal für die Dreh­richtung ausgewertet wird, erfolgt das Zählen immer in eine Richtung, da sich das um 90 Grad verschobene Signal beim Schwin­gen um die Zählflanke nicht ändert.Even if a signal that is phase-shifted by 90 degrees is evaluated for the direction of rotation, counting always takes place in one direction, since the signal shifted by 90 degrees does not change when it swings around the counting edge.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Schaltungsanordnung zur Lagesteuerung eines durch einen Gleich­stommotor betriebenen Abtriebsteiles in einer Schreib- oder ähn­ichen Büromaschine zu schaffen, derart, daß nach den durchge­führten Schrittschaltvorgängen eventuell auftretende Schwingungen der Taktscheibe nicht zu Schrittzählfehlern in dem Zähler führen. Diese Aufgabe wird durch die im Patentanspruch 1 gekennzeichneten Merkmale gelöst.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.

Durch die Verlängerung des aktiven Pegels des dem Zähler zuge­führten Signals ändert sich dieses Signal nicht, wenn das Geber­signal um eine Flanke schwingt. Dadurch werden beim Überschwingen der Taktscheibe auf einfachste Weise keine zusätzlichen Impulse gezählt. Der mechanische Bereich für Schwingungen, wird ver­größert, ohne daß es zu Zählfehlern kommt.By extending the active level of the signal fed to the counter, 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.

Weitere vorteilhafte Ausgestaltungen des Erfindungsgegenstandes sind den weiteren Unteransprüchen zu entnehmen.Further advantageous refinements of the subject matter of the invention can be found in the further subclaims.

Die Erfindung wird anhand eines Ausführungsbeispiels im folgenden näher beschrieben. Es zeigen:

  • Figur 1 ein Blockschaltbild der Schaltungsanordnung zur Positionierung eines Gleichstrommotors,
  • Figur 2 ein Blockschaltbild einer Auswerteschaltung mit einem Verzögerungsglied und
  • Figur 3 ein Zeitdiagramm des Signalverlaufs.
The invention is described in more detail below using an exemplary embodiment. Show it:
  • FIG. 1 shows a block diagram of the circuit arrangement for positioning a DC motor,
  • Figure 2 is a block diagram of an evaluation circuit with a delay element and
  • Figure 3 is a timing diagram of the waveform.

Figur 1 zeigt einen Gleichstrommotor 1, auf dessen Antriebswelle 2 eine Taktscheibe 3 mit über den Umfang gleichmäßig verteilten lichtdurchlässigen Schlitzen 4 befestigt ist. Diese Schlitze 4 werden von einer als Stellungsfühler ausgebildeten Lichtschran­kenanordnung 5 mit einer Lichtquelle 6 und zwei Lichtempfängern 7, 8 abgetastet, die bei einer Drehbewegung der Taktscheibe 3 Impulse über eine Auswerteschaltung 9 und ein Verzögerungsglied 10 an einen Zähler 11 zur Zählung in positiver oder negativer Richtung liefern. Dieser Zähler 11 steht mit einer Steuervorrich­tung 12 in bekannter Weise in Wechselverbindung, die diese Signa­le zur Auswertung, insbesondere zur Lagesteuerung des von dem Gleichstrommotor 1 getriebenen, nicht dargestellten Abtriebs­teiles, z. B. einer drehbar gelagerten Typenscheibe oder eines längsverschiebbaren Schlittens. Der Gleichstrommotor 1 wird übrigens über eine Brückenschaltung 13 von der Steuervorrichtung 12 angesteuert. Wird der Gleichstrommotor 1 aus dem Stillstand der Bestromung von der Brückenschaltung 13 durch die Steuervor­richtung 12 in Drehung versetzt, so wird die Drehrichtung durch die Steuervorrichtung 12 bestimmt. Die positive und negative Drehrichtung wird von einem Drehrichtungsdiskriminator 14 be­stimmt, der entsprechende Lichtschrankensignale von der Auswerte­schaltung 9 erhält. Das von dem Drehrichtungsdiskriminator 14 abgegebene Signal 15 wird im Zähler 11 als Steuerkriterium für den Zählvorgang der von der Lichtschrankenanordnung 5 erhaltenen Impulse in positiver oder negativer Richtung bewertet, so daß durch die im Zähler 11 stehende Zahl die Position für die von dem Gleichstrommotor 1 bewegte Typenscheibe oder der von dem Gleich­strommotor bewegte Schlitten eindeutig bestimmt ist.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. Incidentally, 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.

Die als Stellungsfühler bzw. Encoder dienende Doppellichtschran­kenanordnung 5 ist in einem U-förmig ausgebildeten Lagerbock 16 angeordnet, wobei die Lichtquelle 6 in einem Arm 17 und die beiden Lichtempfänger 7 , 8 in dem anderen Arm 18 des Lagerbockes 16 angeordnet sind. Der Lagerbock 16 ist mit einer Steuerplatine fest verbunden, auf der auch die Steuervorrichtung 12 für den Gleichstrommotor 1 angeordnet ist. Die Taktscheibe 3 ist in einer Ausnehmung zwischen den beiden Armen 17, 18 drehbar angeordnet. Die Abtastung der Taktscheibe 3 kann auch mit anderen Mitteln, z. B. durch elektrische Kontaktgabe, erfolgen. Da die Taktscheibe 3 synchron mit dem Antriebsmotor 1 umläuft, erhält man durch die Codierungen jeweils eine Aussage über die Stellung des Abtriebs­teiles, z. B. einer Typenscheibe.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.

In der Figur 2 ist eine Schaltungsanordnung dargestellt, durch die ein Schwingen der Taktscheibe 3 in einem erweiterten Bereich nicht mehr zu einem falschen Zählergebnis in dem Zähler 11 führt. Hierbei wird das von der Taktscheibe 2 erzeugte Taktsignal 19 über das NAND-Element 21 invertiert und das Flip-Flop bestehend aus den NAND-Elementen 22 und 26 bei positivem Eingangssignal 19 gesetzt und dann als Zählsignal 23 dem Zähler 11 zugeführt. Weiterhin wird über die die Taktscheibe abtastende Lichtschran­kenanordnung noch ein zu dem Taktsignal 19 um 900 phasenverscho­benes Richtungssignal 20 erzeugt, das über einen Flankendetektor, bestehend aus den Exklusiv-Oder-Elementen 24, 27, 28, 29 und einem als Inverter dienenden NAND-Element 25, das Flip-Flop (22, 26) bei einer Schaltflanke auf dem Signal 20 zurücksetzt, wenn Signal 19 nicht mehr positiv ist. Durch dieses Verzögerungsglied steht das Zählsignal länger an, derart, daß Schwingungen der Taktscheibe nicht zu Fehlzählungen des Zählers führen. Das Dreh­richtungssignal 31 wird in der Steuervorrichtung 12 verwertet, wodurch der Zähler 11 dann entsprechend umsteuerbar ist.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. Here, 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. Furthermore, 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. By means of this delay element, 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.

Die Figur 3 zeigt die Diagramme der Signalverläufe, wobei die von der Taktscheibe 3 erzeugten Signale in den Figuren 3a und 3b dargestellt sind. Hierbei zeigen die Figur 3a den Verlauf des Richtungssignals und die Figur 3b den Verlauf des Zählsignals, während die Figuren 3c und 3d die Zeitverläufe des Zähltaktes 23 mit Ausgangstakten in den Richtungen 32 und 33 darstellen. Die Figuren 3c und 3d zeigen deutlich die Verlängerung des aktiven Haltens der dem Zähler 11 zugeführten Zählsignale 23 gegenüber der Dauer des aktiven Haltens der durch die Taktscheibe 3 er­zeugten Taktsignale 19. Hierdurch können die nach den Schritt­schaltvorgängen eventuell auftretenden Schwingungen des Gleich­strommotors 1 mit der Taktscheibe 3 keine Zählfehler mehr in dem Zähler 11 auslösen.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, while 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.

Claims (5)

1. Schaltungsanordnung zur Lagesteuerung eines durch einen Gleichstrommotor betriebenen Abtriebsteiles, z. B. eines drehbar gelagerten Typenrades in einer Schreib- oder Büro­maschine ähnlicher Bauart, wobei eine mit Markierungen ver­sehene Taktscheibe mit der Antriebswel le des Gleichstrom­motors fest verbunden ist und durch eine Abtasteinrichtung zur Abgabe von Signalen zur Auswertung an eine Steuervor­richtung abtastbar ist, gekennzeichnet durch eine die Taktscheibe (3) abfühlende Abtasteinrichtung, welche derart ausgebildet ist, daß zwei um 90 Grad phasenverscho­bene Signale (19, 20) erzeugbar sind, wobei das eine Signal (19) zur Zählung der Takte in einem Zähler (11 ), der mit der Steuervorrichtung in Verbindung steht und das andere Signal (20) für die Bestimmung der Drehrichtung des Gleichstrom­motors (1) ausgewertet werden, und durch ein Steuerglied, das das dem Zähler (11 ) zugeführte Signal länger auf aktivem Pegel hält als das diesen auslösende und durch die Takt­scheibe (3) erzeugte Taktsignal.1. Circuit arrangement for position control of an output part operated by a DC motor, for. B. a rotatably mounted type wheel in a typewriter or office machine of a similar design, with a clock disk provided with markings being firmly connected to the drive shaft of the direct current motor and being scanned by a scanning device for emitting signals for evaluation to a control device, characterized by a Clock disc (3) sensing device which is designed such that two signals (19, 20) out of phase by 90 degrees can be generated, the one signal (19) for counting the clocks in a counter (11) which is connected to the control device in Connection is established and the other signal (20) is evaluated for determining the direction of rotation of the direct current motor (1), and by a control element which keeps the signal supplied to the counter (11) at the active level longer than the one triggering it and by the clock disc ( 3) generated clock signal. 2. Schaltungsanordnung nach Anspruch 1, dadurch gekenn­zeichnet, daß das Steuerglied aus einem Verzögerungs­glied (10) besteht, durch das das dem Zähler (11) zugeführte Signal bis kurz vor die nächste Zählflanke verlängert wird.2. Circuit arrangement according to claim 1, characterized in that the control element consists of a delay element (10) through which the signal supplied to the counter (11) is extended until shortly before the next counting edge. 3. Schaltungsanordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Steuerglied aus einem Ver­zögerungsglied (10) besteht, das eine Verlängerung des Zählsignals bis zum Wechsel des um 90 Grad phasenverschobe­nen Signals erzeugt.3. Circuit arrangement according to claim 1 or 2, characterized in that the control element consists of a delay element (10) which generates an extension of the count signal until the change of the signal phase-shifted by 90 degrees. 4. Schaltungsanordnung nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß die Steuervorrichtung (12) aus einem Mikroprozessor besteht.4. Circuit arrangement according to claim 1, 2 or 3, characterized in that the control device (12) consists of a microprocessor. 5. Verfahren zur Lagesteuerung eines durch einen Gleichstrom­motor betriebenen Abtriebsteiles, z. B. eines drehbar gela­gerten Typenrades in einer Schreib- oder Büromaschine ähn­licher Bauart, wobei eine mit Markierungen versehene Takt­scheibe mit der Antriebswelle des Gleichstrommotors fest verbunden ist und durch eine Abtasteinrichtung zur Abgabe von Signalen zur Auswertung an eine Steuervorrichtung ge­tastet wird, gekennzeichnetdurch eine die Takt­scheibe abfühlende Abtasteinrichtung, welche derart ausge­bildet ist, daß zwei um 90 Grad phasenverschobene Signale erzeugt werden, wobei das eine Signal zur Zählung der Takte in einem Zähler (11 ), der mit der Steuervorrichtung in Ver­bindung steht, und das andere Signal für die Bestimmung der Drehrichtung des Gleichstrommotors (1) ausgewertet werden, und durch ein Steuerglied durch das das aktive Halten des dem Zähler (11) zugeführten Zählsignales (23) gegenüber der Impulsdauer des durch die Taktscheibe (3) erzeugten Takt­signales (19) verlängert wird.5. Method for controlling the position of an output part operated by a DC motor, eg. B. a rotatably mounted type wheel in a typewriter or office machine of a similar type, wherein a clock disk provided with markings is firmly connected to the drive shaft of the direct current motor and is keyed by a scanning device for emitting signals for evaluation to a control device, characterized by a sensor sensing the clock disk Sampling device which is designed such that two signals which are phase-shifted by 90 degrees are generated, the one signal for counting the clocks in a counter (11) which is connected to the control device and the other signal for determining the direction of rotation of the DC motor (1) are evaluated, and by a control element by which the active holding of the counter signal (11) supplied to the counter signal (23) is extended compared to the pulse duration of the clock signal (19) generated by the clock disc (3).
EP19900109083 1989-06-02 1990-05-15 Methode and apparatus for positioning a driving element in a typewriter or similar office machine Withdrawn EP0400390A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3918071 1989-06-02
DE19893918071 DE3918071A1 (en) 1989-06-02 1989-06-02 METHOD AND CIRCUIT ARRANGEMENT FOR POSITION CONTROL OF AN OUTPUT PART IN A TYPEWRITING OR OFFICE MACHINE OF A SIMILAR DESIGN

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EP0400390A2 true EP0400390A2 (en) 1990-12-05
EP0400390A3 EP0400390A3 (en) 1991-06-05

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CN101930013B (en) * 2009-06-25 2012-05-23 华为技术有限公司 Steering detection method and steering detection circuit

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EP0400390A3 (en) 1991-06-05
DE3918071A1 (en) 1990-12-06

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