EP0181876B1 - Drive system for different functions in typewriters or printing machines of similar design, based on the use of an electric motor - Google Patents

Drive system for different functions in typewriters or printing machines of similar design, based on the use of an electric motor Download PDF

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Publication number
EP0181876B1
EP0181876B1 EP85901975A EP85901975A EP0181876B1 EP 0181876 B1 EP0181876 B1 EP 0181876B1 EP 85901975 A EP85901975 A EP 85901975A EP 85901975 A EP85901975 A EP 85901975A EP 0181876 B1 EP0181876 B1 EP 0181876B1
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EP
European Patent Office
Prior art keywords
stator
rotor
locking
drive device
motor
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Expired
Application number
EP85901975A
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German (de)
French (fr)
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EP0181876A1 (en
Inventor
Albert Rix
Heinz Lange
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AEG Olympia Office GmbH
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AEG Olympia AG
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Publication of EP0181876A1 publication Critical patent/EP0181876A1/en
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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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
    • B41J25/316—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with tilting motion mechanisms relative to paper surface
    • 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
    • B41J23/00—Power drives for actions or mechanisms
    • B41J23/32—Electromagnetic power drives, e.g. applied to key levers
    • B41J23/34—Electromagnetic power drives, e.g. applied to key levers applied to elements other than key levers

Definitions

  • the invention relates to a drive device for different functions in typewriters or printing devices of a similar design using an electric motor of the type specified in the preamble of claim 1.
  • EP-OS-0 038 215 discloses a drive device in which a stepper motor which can be driven in a reversible manner can perform two different functions in an office machine, depending on its direction of rotation. After the first function has expired, the second function can only take place after the direction of rotation of the stepper motor has been reversed. Time is lost for two functions to be performed immediately one after the other, such as lifting the printhead from the recording medium and transporting it in the line direction. In addition, a complex circuit arrangement is required for this.
  • a thermal writing mechanism in which a stepping motor is provided for the transport of the record carrier and an electromagnet is provided for pressing and lifting the thermal print head from the record carrier. This makes the writing mechanism relatively complicated and expensive to manufacture.
  • the invention has for its object to provide a common drive device for different functions in writing or printing devices of a similar design using an electric motor, which requires little effort and a simple and space-saving design. This object is achieved by the invention specified in the characterizing part of patent claim 1.
  • a first or a second drive device can either run either at the beginning of the energization of the stepper motor or immediately one after the other.
  • a third and a fourth function can be driven further.
  • the stator and the rotor can each be locked by a locking device.
  • the stator can be pivoted from a starting position into a latchable end position for driving a first drive device, after which, after being blocked in the end position, the drive movement of the rotor starts to drive a second drive device. It is also possible for the rotor and then the stator to be rotated first.
  • a separate locking device z. B. omitted for the rotor In this case, it is necessary that the moments of inertia of the drive devices to be driven in one direction of rotation of the stepping motor are different, such that the rotary movement of the rotor starts automatically after the stator is locked. This further simplifies the drive device.
  • a drive device for a thermal printer with a transport roller 1 for a heat-sensitive recording medium 2, which can be brought into contact with pressure in a known manner to generate records with a thermal print head 3.
  • This thermal print head 3 has thermally insulated areas or dots, which are arranged in the form of a matrix, so that an electrical signal for driving one of these matrix points can be applied, as a result of which the driven matrix point is heated.
  • the thermal print head 3 is fastened on a carrier 4, on which a cable 5 for supplying a signal for driving the matrix points of the thermal print head 3 is fixedly arranged.
  • a gear 6 On an axis 7 of the transport roller 1, a gear 6 is fixed on one side, which is in engagement with an intermediate gear 8.
  • This intermediate gear 8 is fixedly connected to a drive wheel 9 which can be driven by a pinion 10.
  • This pinion 10 is fastened to the rotor 11 of a stepping motor 12, the rotor 11 being rotatably mounted in bearings 15, 16 arranged on both sides of the motor 12 in side walls 13, 14.
  • a control element 18 is firmly connected to the stator 17 of the stepping motor 12, which has a latching recess 19 and control cams 21, 22 arranged symmetrically with respect to this (19), see FIG. 1.
  • control element 18 is provided with stop edges 23, 24 which are used for Limit tion of the pivoting movement of the stator 17 on the rotor 11 with stops 25, 26 fixed to the frame can be brought into contact.
  • the stop edges 23, 24 are for the purpose of adjustment from bendable webs 27, 28, which recesses 29, 30 for engagement of an adjusting tool, for. B. a commercially available screwdriver.
  • the pivoting movement of the stator 17 from a central position in both directions of rotation can be set exactly in the simplest way.
  • a locking lug 31 of a slider 20 which is spring-loaded by a spring 32, can be snapped in and is slidably mounted on guide bolts 34, 35 by means of an elongated hole 33.
  • the spring 32 is articulated on the one hand with the guide pin 34 and on the other hand on a printhead release rocker 36, such that a stop edge 37 on the printhead release rocker 36 always lies non-positively on a stop lug 38 of the slide 20 and acts on the slide 20 in the direction of arrow 39.
  • the printhead release rocker 36 is pivotally mounted about an axis 40 fixed to the frame and has a rail 41 arranged in the row direction. This rail 41 can be brought into contact with a stop arm 42 of the carrier 4 with the thermal print head 3 for releasing this thermal print head 3.
  • the carrier 4 is displaceable in the line direction on a guide axis 43 arranged parallel to the transport roller and is pivotably mounted about this (43) against the force of a spring 44.
  • the stepping motor 12 is operated by a control element, not shown, e.g. B. controlled and energized by a microprocessor in the desired direction of rotation. Due to the inertia of the transmission elements 9, 8, 6, which are operatively connected to the pinion 10 of the stepping motor 12, and the transport roller 1, the stator 17 is first pivoted about the rotor 11. As a result of the now rotating movement of the stator 17, the slide 20 is displaced in the opposite direction of the arrow 39 via one of the control cams 21, 22, the print head release rocker 36 being pivoted counter-clockwise about the axis 40.
  • a control element not shown, e.g. B. controlled and energized by a microprocessor in the desired direction of rotation. Due to the inertia of the transmission elements 9, 8, 6, which are operatively connected to the pinion 10 of the stepping motor 12, and the transport roller 1, the stator 17 is first pivoted about the rotor 11. As a result of the now rotating movement of the stator 17, the slide 20 is
  • the stop arm 42 of the carrier 4 is pivoted clockwise about the axis 43 via the rail 41.
  • the thermal print head 3 detaches from the recording medium 2, so that no wear of the thermal print head 3 can occur during the above-mentioned non-printing relative movements.
  • the pivotal movement of the stator 17 is limited clockwise by hitting the stop edge 24 against the stop 26 and counterclockwise by hitting the stop edge 23 against the stop 25.
  • the rotor 11 begins to rotate, as a result of which the transport roller 1 for transporting the recording medium 2 is rotated in the line feed or line return direction via the gear pairs 10/9 and 8/6.
  • the slide 20 is locked via the cam sections 45 and 46 and thus the print head release rocker 36 and the carrier 24 are held in the pivoted position.
  • the direction of rotation of the stepper motor 12 is reversed, this stepper motor 12 receiving so many drive impulses that the slider 20 with its catch 31 can snap back into the catch recess 19 of the control element 18.
  • the printhead release rocker 36 and the carrier 24 are returned to their working positions.
  • the thermal print head 3 is now again in pressure contact with the recording medium 2.
  • the rotor 11 stops again, the stator 17 being pivoted back into the central position alone.
  • control element 18 it is also possible for the control element 18 to be automatically returned to the latchable central position after the stepper motor 12 has been de-energized by the sprung (22) slide 20.
  • the control cams 50, 51 must have a shape according to FIG. 3 such that the slide 20 cannot be locked in the end positions of the stator 17 via the control cams 50, 51.
  • the stepping motor 12 again, e.g. B. by the microprocessor.
  • two oppositely toothed gear wheels 52, 53 can also be fixedly connected to the rotor 11, with the toothings 54, 55 of which pawls 56, 57 are engaged.
  • the pawls 56, 57 are pivotable on both sides of the rotor 11 about fixed axles 58, 59, by a common spring 60 with their ratchet teeth 61, 62 in engagement with the teeth 54, 55 of the ratchet gears 52, 53 and by one with the Stator 12 pivotable pin 63 can be brought out of engagement with the ratchet gears 52, 53.
  • This reliably prevents the rotor from being able to pass on a rotary movement via the intermediate gearwheels to the transport roller 1 only when the stator 17 has reached one of the end positions.
  • a rotary movement of the rotor 11 is only possible when one of the pawls 56, 57 has been disengaged from the toothing 54, 55 of the locking gear wheels 52, 53.
  • the thermal printer according to the invention is characterized by a simple and inexpensive construction, with a long service life of the thermal print head being guaranteed. It can also be used advantageously when characters are generated on plain paper with the interposition of a heat-sensitive ink ribbon.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Common Mechanisms (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)

Abstract

In typewriters and similar machines, in order to perform several functions use is made, for example, of either a separate drive element for each function or of a common drive motor. A change of functions in a common drive motor, in the existing state of the art, is possible by reversing the rotation direction of the motor or by operating an intermediate clutch. The purpose of the invention is to create a common drive device for different functions in typewriters or similar office machines which is less costly and offers a simple and compact design. This problem is solved by the fact that the stator (17) and the rotor (11) of a stepping motor (12) can be operated and locked alternatively for the transmission of the energy supplied by the motor (12) to a first or a second drive mechanism. Since the stator and rotor (11) of the same stepping motor (12) can drive different functions, an inexpensive drive system can be produced.

Description

Die Erfindung betrifft eine Antriebseinrichtung für unterschiedliche Funktionen bei Schreibmaschinen oder Druckvorrichtungen ähnlicher Bauart unter Verwendung eines Elektromotors der im Oberbegriff des Patentanspruchs 1 angegebenen Art.The invention relates to a drive device for different functions in typewriters or printing devices of a similar design using an electric motor of the type specified in the preamble of claim 1.

Bei Schreib- oder ähnlichen Büromaschinen ist es z. B. bekannt, für mehrere Antriebsfunktionen entweder je ein gesondertes Antriebselement oder einen gemeinsamen Antriebsmotor zu verwenden. Ein Wechsel der Funktion bei einem gemeinsamen Antriebsmotor ist durch den Stand der Technik durch Drehrichtungsumkehr des Antriebsmotors oder durch Betätigen von zwischengeschalteten Kupplungen möglich. So ist durch die EP-OS-0 038 215 eine Antriebsvorrichtung bekannt, bei der ein reversierbar antreibbarer Schrittmotor je nach seiner Drehrichtung zwei unterschiedliche Funktionen in einer Büromaschine ausführen kann. Die zweite Funktion kann nach Ablauf der ersten Funktion erst nach Drehrichtungsumkehr des Schrittmotors erfolgen. Für zwei unmittelbar nacheinander abzulaufende Funktionen, wie Schreibkopfabhebung vom Aufzeichnungsträger und dessen Transport in Zeilenrichtung entstehen Zeitverluste. Außerdem ist hierfür eine aufwendige Schaltungsanordnung erforderlich.In typewriters or similar office machines it is e.g. B. known to use either a separate drive element or a common drive motor for multiple drive functions. The state of the art makes it possible to change the function of a common drive motor by reversing the direction of rotation of the drive motor or by actuating interposed clutches. EP-OS-0 038 215 discloses a drive device in which a stepper motor which can be driven in a reversible manner can perform two different functions in an office machine, depending on its direction of rotation. After the first function has expired, the second function can only take place after the direction of rotation of the stepper motor has been reversed. Time is lost for two functions to be performed immediately one after the other, such as lifting the printhead from the recording medium and transporting it in the line direction. In addition, a complex circuit arrangement is required for this.

Aus der DE-PS-24 06 613 ist ein Thermoschreibwerk bekannt, bei dem für den Transport des Aufzeichnungsträgers ein Schrittmotor und für das Andrücken und für das Abheben des Thermodruckkopfes von dem Aufzeichnungsträger je ein Elektromagnet vorgesehen sind. Hierdurch wird das Schreibwerk verhältnismäßig kompliziert und teuer in der Herstellung.From DE-PS-24 06 613 a thermal writing mechanism is known, in which a stepping motor is provided for the transport of the record carrier and an electromagnet is provided for pressing and lifting the thermal print head from the record carrier. This makes the writing mechanism relatively complicated and expensive to manufacture.

Der Erfindung liegt die Aufgabe zugrunde, eine gemeinsame Antriebsvorrichtung für unterschiedliche Funktionen bei Schreib- oder Druckvorrichtungen ähnlicher Bauart unter Verwendung eines Elektromotors zu schaffen, die wenig aufwendig und eine einfache und raumsparende Bauweise ermöglicht. Diese Aufgabe wird durch die im Kennzeichen des Patentanspruchs 1 angegebene Erfindung gelöst.The invention has for its object to provide a common drive device for different functions in writing or printing devices of a similar design using an electric motor, which requires little effort and a simple and space-saving design. This object is achieved by the invention specified in the characterizing part of patent claim 1.

Da über den Stator und den Rotor desselben Schrittmotors unterschiedliche Funktionen antreibbar sind, wird eine billige Antriebseinrichtung geschaffen. Durch das wechselweise Sperren des Stators und des Rotors des Schrittmotors können eine erste oder eine zweite Antriebseinrichtung entweder wahlweise zu Beginn der Bestromung des Schrittmotos oder unmittelbar nacheinander ablaufen.Since different functions can be driven via the stator and the rotor of the same stepping motor, an inexpensive drive device is created. By alternately locking the stator and the rotor of the stepper motor, a first or a second drive device can either run either at the beginning of the energization of the stepper motor or immediately one after the other.

Durch die vorteilhafte Ausgestaltung des Erfindungsgegenstandes nach Patentanspruch 2 können weiter eine dritte und eine vierte Funktion angetrieben werden. Die Sperrung des Stators und des Rotors kann durch je eine Sperreinrichtung erfolgen. So ist der Stator nach Bestromung des Motors aus einer Ausgangsstellung in eine rastbare Endstellung zum Antreiben einer ersten Antriebseinrichtung schwenkbar, wonach nach dessen Sperrung in der Endstellung die Antriebsbewegung des Rotors zum Antrieb einer zweiten Antriebseinrichtung einsetzt. Es ist auch möglich, daß zuerst der Rotor und danach der Stator in Drehung gesetzt werden.Due to the advantageous embodiment of the subject matter of the invention, a third and a fourth function can be driven further. The stator and the rotor can each be locked by a locking device. Thus, after energization of the motor, the stator can be pivoted from a starting position into a latchable end position for driving a first drive device, after which, after being blocked in the end position, the drive movement of the rotor starts to drive a second drive device. It is also possible for the rotor and then the stator to be rotated first.

Durch eine weitere Ausgestaltung des Erfindungsgegenstandes nach Patentanspruch 8 kann eine gesonderte Sperreinrichtung z. B. für den Rotor entfallen. In diesem Fall ist es erforderlich, daß die Trägheitsmomente der in einer Drehrichtung des Schrittmotors anzutreibenden Antriebseinrichtungen unterschiedlich sind, derart, daß die Drehbewegung des Rotors automatisch nach Sperrung des Stators einsetzt. Hierdurch wird die Antriebsvorrichtung weiter sehr vereinfacht.By a further embodiment of the subject matter of claim 8, a separate locking device z. B. omitted for the rotor. In this case, it is necessary that the moments of inertia of the drive devices to be driven in one direction of rotation of the stepping motor are different, such that the rotary movement of the rotor starts automatically after the stator is locked. This further simplifies the drive device.

Weitere vorteilhafte Merkmale der Erfindung sind in den Unteransprüchen gekennzeichnet. Die Erfindung ist anhand von Ausführungsbeispielen in den Zeichnungen dargestellt und wird im folgenden näher erläutert. Es zeigt

  • Figur 1 eine schematische Darstellung des Thermodrucker in Seitenansicht,
  • Figur 2 eine Draufsicht auf einige erfindungswesentliche Teile gemäß Figur 1,
  • Figur 3 eine Seitenansicht auf eine zweite Ausführungsform und
  • Figur 4 eine Seitenansicht auf eine vorteilhafte Ausgestaltung des Erfindungsgegenstandes.
Further advantageous features of the invention are characterized in the subclaims. The invention is illustrated in the drawings using exemplary embodiments and is explained in more detail below. It shows
  • FIG. 1 shows a schematic illustration of the thermal printer in a side view,
  • FIG. 2 shows a top view of some parts essential to the invention according to FIG. 1,
  • Figure 3 is a side view of a second embodiment and
  • Figure 4 is a side view of an advantageous embodiment of the subject matter of the invention.

In den Figuren 1 und 2 ist z. B. eine Antriebsvorrichtung für einen Thermodrucker mit einer Transportwalze 1 für einen wärmeempfindlichen Aufzeichnungsträger 2 dargestellt, welcher zur Erzeugung von Aufzeichnungen mit einem Thermodruckkopf 3 in bekannter Weise in Druckkontaktberührung bringbar ist. Dieser Thermodruckkopf 3 weist thermisch isolierte Bereiche bzw. Punkte auf, die in Gestalt einer Matrix angeordnet sind, so daß ein elektrisches Signal zum Ansteuern eines dieser Matrixpunkte angelegt werden kann, wodurch ein Erwärmen des angesteuerten Matrixpunktes erfolgt. Der Thermodruckkopf 3 ist auf einem Träger 4 befestigt, an dem ein Kabel 5 zum Zuführen eines Signals zum Ansteuern der Matrixpunkte des Thermodruckkopfes 3 fest angeordnet ist.In Figures 1 and 2, for. B. is shown a drive device for a thermal printer with a transport roller 1 for a heat-sensitive recording medium 2, which can be brought into contact with pressure in a known manner to generate records with a thermal print head 3. This thermal print head 3 has thermally insulated areas or dots, which are arranged in the form of a matrix, so that an electrical signal for driving one of these matrix points can be applied, as a result of which the driven matrix point is heated. The thermal print head 3 is fastened on a carrier 4, on which a cable 5 for supplying a signal for driving the matrix points of the thermal print head 3 is fixedly arranged.

An einer Achse 7 der Transportwalze 1 ist an einer Seite ein Zahnrad 6 befestigt, das mit einem Zwischenzahnrad 8 in Eingriff steht. Dieses Zwischenzahnrad 8 ist mit einem Antriebsrad 9 fest verbunden, das durch ein Ritzel 10 antreibbar ist. Dieses Ritzel 10 ist an dem Rotor 11 eines Schrittmotors 12 befestigt, wobei der Rotor 11 in beiderseits des Motors 12 in Seitenwänden 13, 14 angeordneten Lagern 15, 16 drehbar gelagert ist. Mit dem Stator 17 des Schrittmotors 12 ist ein Steuerelement 18 fest verbunden, das eine Rastausnehmung 19 und zu dieser (19) symmetrisch angeordnete Steuerkurven 21, 22 aufweist, siehe Figur 1. Außerdem ist das Steuerelement 18 mit Anschlagkanten 23, 24 versehen, die zur Begrenzung der Schwenkbewegung des Stators 17 auf dem Rotor 11 mit gestellfesten Anschlägen 25, 26 zur Anlage bringbar sind. Die Anschlagkanten 23, 24 bestehen zwecks Justage aus biegbaren Stegen 27, 28, welche Aussparungen 29, 30 zum Eingriff eines Justierwerkzeuges, z. B. eines handelsüblichen Schraubendrehers aufweisen. Hierdurch kann die, Schwenkbewegung des Stators 17 aus einer Mittellage heraus in beiden Drehrichtungen auf einfachste Weise exakt eingestellt werden. In die Rastausnehmung 19 ist eine Rastnase 31 eines durch eine Feder 32 abgefederten Schiebers 20 einrastbar, welcher mittels eines Langloches 33 auf Führungsbolzen 34, 35 verschiebbar gelagert ist. Die Feder 32 ist einerseits mit dem Führungsbolzen 34 und andererseits an einer Druckkopflöseschwinge 36 angelenkt, derart, daß eine Anschlagkante 37 an der Druckkopflöseschwinge 36 an einer Anschlagnase 38 des Schiebers 20 stets kraftschlüssig anliegt und den Schieber 20 in Pfeilrichtung 39 beaufschlagt. Die Druckkopflöseschwinge 36 ist um eine gestellfeste Achse 40 schwenkbar gelagert und weist eine in Zeilenrichtung angeordnete Schiene 41 auf. Diese Schiene 41 ist mit einem Anschlagarm 42 des Trägers 4 mit dem Thermodruckkopf 3 zum Lösen dieses Thermodruckkopfes 3 in Berührung bringbar. Der Träger 4 ist übrigens auf einer parallel zur Transportwalze angeordneten Führungsachse 43 in Zeilenrichtung verschiebbar und um diese (43) gegen die Kraft einer Feder 44 verschwenkbar gelagert.On an axis 7 of the transport roller 1, a gear 6 is fixed on one side, which is in engagement with an intermediate gear 8. This intermediate gear 8 is fixedly connected to a drive wheel 9 which can be driven by a pinion 10. This pinion 10 is fastened to the rotor 11 of a stepping motor 12, the rotor 11 being rotatably mounted in bearings 15, 16 arranged on both sides of the motor 12 in side walls 13, 14. A control element 18 is firmly connected to the stator 17 of the stepping motor 12, which has a latching recess 19 and control cams 21, 22 arranged symmetrically with respect to this (19), see FIG. 1. In addition, the control element 18 is provided with stop edges 23, 24 which are used for Limit tion of the pivoting movement of the stator 17 on the rotor 11 with stops 25, 26 fixed to the frame can be brought into contact. The stop edges 23, 24 are for the purpose of adjustment from bendable webs 27, 28, which recesses 29, 30 for engagement of an adjusting tool, for. B. a commercially available screwdriver. As a result, the pivoting movement of the stator 17 from a central position in both directions of rotation can be set exactly in the simplest way. In the locking recess 19, a locking lug 31 of a slider 20, which is spring-loaded by a spring 32, can be snapped in and is slidably mounted on guide bolts 34, 35 by means of an elongated hole 33. The spring 32 is articulated on the one hand with the guide pin 34 and on the other hand on a printhead release rocker 36, such that a stop edge 37 on the printhead release rocker 36 always lies non-positively on a stop lug 38 of the slide 20 and acts on the slide 20 in the direction of arrow 39. The printhead release rocker 36 is pivotally mounted about an axis 40 fixed to the frame and has a rail 41 arranged in the row direction. This rail 41 can be brought into contact with a stop arm 42 of the carrier 4 with the thermal print head 3 for releasing this thermal print head 3. Incidentally, the carrier 4 is displaceable in the line direction on a guide axis 43 arranged parallel to the transport roller and is pivotably mounted about this (43) against the force of a spring 44.

Zum Lösen des Thermodruckkopfes 3 von dem Aufzeichnungsträger 2 während der Nichtdruck-Relativbewegungen zwischen dem Thermodruckkopf 3 und dem Aufzeichnungsträger 1 wird der Schrittmotor 12 durch ein nicht dargestelltes Steuerelement, z. B. durch einen Mikroprozessor in die gewünschte Drehrichtung angesteuert und bestromt. Durch die Trägheit der mit dem Ritzel 10 des Schrittmotors 12 in Wirkverbindung stehenden Übertragungsglieder 9, 8, 6 und der Transportwalze 1 wird zunächst der Stator 17 um den Rotor 11 verschwenkt. Durch die nun einsetztende Drehbewegung des Stators 17 wird über eine der Steuerkurven 21, 22 der Schieber 20 entgegen der Pfeilrichtung 39 verschoben, wobei die Druckkopflöseschwinge 36 um die Achse 40 im Gegenuhrzeigersinn geschwenkt wird. Hierdurch wird über die Schiene 41 der Anschlagarm 42 des Trägers 4 im Uhrzeigersinn um die Achse 43 geschwenkt. Der Thermodruckkopf 3 löst sich hierbei von dem Aufzeichnungsträger 2, so daß kein Verschleiß des Thermodruckkopfes 3 während der oben genannten Nichtdruck-Relativbewegungen auftreten kann. Die Schwenkbewegung des Stators 17 wird im Uhrzeigersinn durch Anschlagen der Anschlagkante 24 gegen den Anschlag 26 und im Gegenuhrzeigersinn durch Anschlagen der Anschlagkante 23 gegen den Anschlag 25 begrenzt. Nach der Sperrung der Schwenkbewegung des Stators 17 beginnt der Rotor 11 zu drehen, wodurch über die Zahnradpaarungen 10/9 und 8/6 die Transportwalze 1 zum Transport des Aufzeichnungsträgers 2 in Zeilenvorlauf- oder in Zeilenrücklaufrichtung gedreht wird. Während dieser Drehbewegungen des Rotors 11 wird der Schieber 20 über die Kurvenabschnitte 45 bzw. 46 arretiert und somit die Druckkopflöseschwinge 36 und der Träger 24 in der verschwenkten Stellung gehalten. Nach dem gewünschten Transport des Aufzeichnungsträgers 2 wird die Drehrichtung des Schrittmotors 12 umgekehrt, wobei dieser Schrittmotor 12 soviele Antriebsimpulse erhält, daß der Schieber 20 mit seiner Rastnase 31 wieder in die Rastausnehmung 19 des Steuerelementes 18 federnd einrasten kann. Hierbei werden die Druckkopflöseschwinge 36 und der Träger 24 in ihre Arbeitslagen zurückgestellt. Der Thermodruckkopf 3 befindet sich jetzt wieder in Druckkontaktberührung mit dem Aufzeichnungsträger 2. Bei der oben genannten Bestromung des Schrittmotors in der umgekehrten Drehrichtung bleibt der Rotor 11 wieder stehen, wobei der Stator 17 allein in die Mittellage zurückgeschwenkt wird.To release the thermal print head 3 from the recording medium 2 during the non-printing relative movements between the thermal printing head 3 and the recording medium 1, the stepping motor 12 is operated by a control element, not shown, e.g. B. controlled and energized by a microprocessor in the desired direction of rotation. Due to the inertia of the transmission elements 9, 8, 6, which are operatively connected to the pinion 10 of the stepping motor 12, and the transport roller 1, the stator 17 is first pivoted about the rotor 11. As a result of the now rotating movement of the stator 17, the slide 20 is displaced in the opposite direction of the arrow 39 via one of the control cams 21, 22, the print head release rocker 36 being pivoted counter-clockwise about the axis 40. As a result, the stop arm 42 of the carrier 4 is pivoted clockwise about the axis 43 via the rail 41. The thermal print head 3 detaches from the recording medium 2, so that no wear of the thermal print head 3 can occur during the above-mentioned non-printing relative movements. The pivotal movement of the stator 17 is limited clockwise by hitting the stop edge 24 against the stop 26 and counterclockwise by hitting the stop edge 23 against the stop 25. After the pivoting movement of the stator 17 has been blocked, the rotor 11 begins to rotate, as a result of which the transport roller 1 for transporting the recording medium 2 is rotated in the line feed or line return direction via the gear pairs 10/9 and 8/6. During these rotary movements of the rotor 11, the slide 20 is locked via the cam sections 45 and 46 and thus the print head release rocker 36 and the carrier 24 are held in the pivoted position. After the desired transport of the record carrier 2, the direction of rotation of the stepper motor 12 is reversed, this stepper motor 12 receiving so many drive impulses that the slider 20 with its catch 31 can snap back into the catch recess 19 of the control element 18. Here, the printhead release rocker 36 and the carrier 24 are returned to their working positions. The thermal print head 3 is now again in pressure contact with the recording medium 2. When the above-mentioned energization of the stepping motor in the reverse direction of rotation, the rotor 11 stops again, the stator 17 being pivoted back into the central position alone.

Im Rahmen der Erfindung ist es auch möglich, daß das Steuerelement 18 nach der Entstromung des Schrittmotors 12 durch den abgefederten (22) Schieber 20 selbsttätig in die rastbare Mittellage zurückgestellt wird. Hierbei müssen die Steuerkurven 50, 51 eine Form gemäß Figur 3 aufweisen, derart, daß der Schieber 20 nicht in den Endlagen des Stators 17 über die Steuerkurven 50, 51 verrastbar ist. Hierbei entfällt nach dem Transport des Aufzeichnungsträgers eine erneute Ansteuerung des Schrittmotors 12, z. B. durch den Mikroprozessor.Within the scope of the invention, it is also possible for the control element 18 to be automatically returned to the latchable central position after the stepper motor 12 has been de-energized by the sprung (22) slide 20. The control cams 50, 51 must have a shape according to FIG. 3 such that the slide 20 cannot be locked in the end positions of the stator 17 via the control cams 50, 51. Here, after the transport of the record carrier, there is no need to actuate the stepping motor 12 again, e.g. B. by the microprocessor.

Auch können gemäß Figur 4 zwei entgegengesetzt verzahnte Zahnräder 52, 53 mit dem Rotor 11 fest verbunden sein, mit deren Verzahnungen 54, 55 Sperrklinken 56, 57 in Eingriff stehen. Die Sperrklinken 56, 57 sind beiderseits des Rotors 11 um gestellfeste Achsen 58, 59 schwenk-, durch eine gemeinsame Feder 60 mit ihren Sperrzähnen 61,62 in Eingriff mit den Verzahnungen 54, 55 der Sperrzahnräder 52, 53 halt- und durch einen mit dem Stator 12 schwenkbaren Stift 63 außer Eingriff mit den Sperrzahnrädern 52, 53 bringbar. Hierdurch wird sicher verhindert, daß der Rotor eine Drehbewegung über die Zwischenzahnräder an die Transportwalze 1 erst weitergeben kann, wenn der Stator 17 eine der Endlagen erreicht hat. Eine Drehbewegung des Rotors 11 ist erst möglich, wenn einer der Sperrklinken 56, 57 außer Eingriff mit den Verzahnungen 54, 55 der Sperrzahnräder 52, 53 gebracht worden ist.4, two oppositely toothed gear wheels 52, 53 can also be fixedly connected to the rotor 11, with the toothings 54, 55 of which pawls 56, 57 are engaged. The pawls 56, 57 are pivotable on both sides of the rotor 11 about fixed axles 58, 59, by a common spring 60 with their ratchet teeth 61, 62 in engagement with the teeth 54, 55 of the ratchet gears 52, 53 and by one with the Stator 12 pivotable pin 63 can be brought out of engagement with the ratchet gears 52, 53. This reliably prevents the rotor from being able to pass on a rotary movement via the intermediate gearwheels to the transport roller 1 only when the stator 17 has reached one of the end positions. A rotary movement of the rotor 11 is only possible when one of the pawls 56, 57 has been disengaged from the toothing 54, 55 of the locking gear wheels 52, 53.

Der erfindungsgemäße Thermodrucker zeichnet sich durch einen einfachen und billigen Aufbau aus, wobei eine lange Lebensdauer des Thermodruckkopfes gewährleistet wird. Auch ist er vorteilhaft einsetzbar, wenn Schriftzeichen unter Zwischenschaltung eines wärmeempfindlichen Farbbandes auf Normalpapier erzeugt werden.The thermal printer according to the invention is characterized by a simple and inexpensive construction, with a long service life of the thermal print head being guaranteed. It can also be used advantageously when characters are generated on plain paper with the interposition of a heat-sensitive ink ribbon.

Claims (10)

1. A drive device for different functions in typewriting machines or printing devices of similar construction type using an electric motor, characterised in that both the stator (17) and the rotor (11) of the electric motor are mounted to be freely rotatable and are in operative connection with different drive devices.
2. A drive device according to claim 1, characterised in that the electric motor may be driven reversibly.
3. A drive device according to claim 1, characterised in that the rotation of the stator (17) and/or the rotor is stopped by a locking device.
4. A drive device according to claim 3, characterised by a motor (12) moved in steps, the rotor of which is in connection with a transportation roller for transporting the recording medium of a thermal printer and the stator of which causes a thermal printing head to be released and pressed down, in which the moment of inertia of the drive arrangement causing transportation of the recording medium is so large that the stator rotates first, when the motor has current.
5. A drive device according to claim 4, characterised in that stops (25, 26) which are fixed to the frame are provided and project into the path of crosspieces (27, 28) which are fixed to the stator (17).
6. A printer having a drive device according to claim 5, in which the printing head (3) is arranged on a carriage which is displaceable in line forward and line backward directions on a guide shaft and the stator (17) has a control element (18) with a locking recess (19) for a resiliently loaded slider (20) in which the control element (18) has control curves (21, 22) on both sides of the locking recess 19, by means of which curves the slider (20) for the printing head (3) may be actuated upon pivoting of the stator (17) in order to displace a printing head release rocker arm (36), which is pivotally mounted about can axle 40.
7. A printer according to claim 6, characterised in that the printing head release rocker arm (36) has a rail (41) arranged in line direction, which may be brought into operative connection with a stop arm (42) on the pivotable printing head (3) in order to release the same.
8. A printer according to claim 6 or 7, characterised in that a resetting soring (32) engages the slider (20) and forces it against the control element (18).
9. A printer according to any one of claims 6 to 8, characterised in that two oppositely geared locking gear wheels (52, 53) are firmly connected to the rotor (11), locking catches (56, 57) engaging into their toothing (54, 55), and that the locking catches (56, 57) may be brought alternately out of engagement, depending on the transportation direction, in order to transport the recording medium (2).
10. A printer according to claim 9, characterised in that the locking catches (56, 57) may be pivoted on both sides of the rotor (11) about axles (58, 59) which are fixed to the frame, may be held in engagement with the toothing (54, 55) of the locking gear heels (52, 53) by a common spring (60) with its locking teeth (61, 62) and may be brought out of engagement with the locking gear wheels (52, 53) by a pin (63) which may be pivoted with the stator (17).
EP85901975A 1984-05-02 1985-04-19 Drive system for different functions in typewriters or printing machines of similar design, based on the use of an electric motor Expired EP0181876B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3416168 1984-05-02
DE3416168 1984-05-02

Publications (2)

Publication Number Publication Date
EP0181876A1 EP0181876A1 (en) 1986-05-28
EP0181876B1 true EP0181876B1 (en) 1988-07-27

Family

ID=6234769

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Application Number Title Priority Date Filing Date
EP85901975A Expired EP0181876B1 (en) 1984-05-02 1985-04-19 Drive system for different functions in typewriters or printing machines of similar design, based on the use of an electric motor

Country Status (4)

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EP (1) EP0181876B1 (en)
JP (1) JPS61502047A (en)
DE (1) DE3563931D1 (en)
WO (1) WO1985005076A1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR937012A (en) * 1941-08-12 1948-08-05 King Ltd Geo W Braking device for electric motors
GB1206220A (en) * 1968-05-31 1970-09-23 Colchester Woods Improvements in or relating to actuating arrangements for operating shutters associated with electric-motor-driven fans
JPS49106731A (en) * 1973-02-12 1974-10-09
US3853024A (en) * 1973-10-29 1974-12-10 Ibm Two speed drive system for print mechanism or the like
IT1130115B (en) * 1980-04-15 1986-06-11 Olivetti & Co Spa ACTUATION DEVICE FOR TWO FUNCTIONS OF WRITING MACHINES
CH663601A5 (en) * 1982-10-06 1987-12-31 Kurt Ruenzi METHOD AND TRANSPORT DEVICE FOR SUPPLYING SHEET-SHAPED IMPRESSION MATERIAL TO AN OFFICE MACHINE.

Also Published As

Publication number Publication date
EP0181876A1 (en) 1986-05-28
JPS61502047A (en) 1986-09-18
WO1985005076A1 (en) 1985-11-21
DE3563931D1 (en) 1988-09-01

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