[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

EP0110020B1 - Character printing device for a typewriter or the like - Google Patents

Character printing device for a typewriter or the like Download PDF

Info

Publication number
EP0110020B1
EP0110020B1 EP83108455A EP83108455A EP0110020B1 EP 0110020 B1 EP0110020 B1 EP 0110020B1 EP 83108455 A EP83108455 A EP 83108455A EP 83108455 A EP83108455 A EP 83108455A EP 0110020 B1 EP0110020 B1 EP 0110020B1
Authority
EP
European Patent Office
Prior art keywords
print hammer
coil
voltage
typewriter
hammer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83108455A
Other languages
German (de)
French (fr)
Other versions
EP0110020A2 (en
EP0110020A3 (en
Inventor
Hans Wehking
Manfred Gottschlich
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.)
Olympia AG
Original Assignee
AEG Olympia AG
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 filed Critical AEG Olympia AG
Publication of EP0110020A2 publication Critical patent/EP0110020A2/en
Publication of EP0110020A3 publication Critical patent/EP0110020A3/en
Application granted granted Critical
Publication of EP0110020B1 publication Critical patent/EP0110020B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J9/00—Hammer-impression mechanisms
    • B41J9/26—Means for operating hammers to effect impression
    • B41J9/38—Electromagnetic means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J9/00—Hammer-impression mechanisms
    • B41J9/16—Means for cocking or resetting hammers
    • B41J9/24—Electromagnetic means

Definitions

  • the invention relates to a typewriter or similar machine with a type tee system of the type specified in the preamble of claim 1, in which a print hammer can be actuated electromagnetically.
  • a print hammer is accelerated from its rest position to a tapping position by a short voltage pulse applied to a winding, where a type is imprinted on a recording medium with the interposition of an ink ribbon.
  • the type to be printed is z. B. directly on the print hammer or on a type carrier to be preset before the impression, such as a type plate.
  • the return of the pressure hammer to the rest position is then carried out by the kinetic energy reversed upon impact with the pressure abutment and is supported by the force of a spring - if a faster return is required for a quicker reinsertion of the pressure hammer.
  • the arrangement of such a spring has a disadvantageous effect on the striking movement because its restoring force must also be overcome.
  • So-called electrodynamic teeing systems such as. B. are known from DE-A-3 038 881, avoid this disadvantage.
  • permanent magnets generate a magnetic field in which the print hammer is mounted so that it can move in the tapping direction.
  • a winding is provided, to which the voltage pulse triggering the reduction is applied.
  • the magnetic field generated by the winding which acts counter to the permanent magnets, causes the print hammer to accelerate into the knock-off position, and the return movement of the print hammer to the rest position is supported by the magnetic field of the permanent magnets when the voltage pulse in the winding has ended.
  • WO-A-80/00552 shows an electromagnetically actuated print hammer and a control device, by means of which the application of voltage pulses which cause the striking movements to the winding of the type striking system can be controlled.
  • a voltage pulse of reversed polarity causing the return movement, is applied to the winding for returning the print hammer from the knock-off position to the rest position.
  • the application of this voltage pulse for the return current is not made dependent on the detection of the impact of the printing hammer in the tee position.
  • the invention has for its object to control the hammer of a tee system of the type mentioned in such a way that the tee movements can follow each other faster.
  • the advantages of the invention consist in particular in that a faster printing unit can be created because the print hammer is moved faster out of the setting range of the type support and thus an immediate setting of the type support to a new type to be printed is possible, and because the print hammer reaches its rest position more quickly and is ready for a new triggering of an impression.
  • the striking system manages with a relatively small striking magnet and a small control voltage.
  • the point in time at which the return current is switched on can be optimally set. As a result, there is no longer any dependency on the distance between the pressure abutment and the print hammer, on the thickness and hardness of the recording medium and on manufacturing and operating tolerances.
  • FIG. 1 shows the electromagnetic tapping system of a typewriter and the associated control device with the details necessary for understanding the invention.
  • the tee system 1 belongs to the so-called dynamic type, which in addition to a printing hammer 2 has both a winding 3 a) s and a permanent magnet 4, the winding 3 being arranged on the printing hammer 2 which is movably mounted in the magnetic field of the permanent magnet 4 in the tee direction.
  • a voltage pulse applied to the winding 3 causes the pressure hammer 2 to accelerate suddenly in the direction of the preset pressure type of a type carrier 5 formed by a type wheel, whereby the character to be imaged is knocked off in a known manner by means of an ink ribbon 6 on a recording medium 7 which is arranged in front of a print abutment 8.
  • Both the setting of the type carrier 5 to the type to be rejected as well as the application of the voltage pulse to the winding 3 to trigger the type discount is controlled by a control device 9, which is also formed in a known manner by a microcomputer.
  • the control device 9 first of all sends the necessary control signals to a motor control circuit 10, from which the setting motor 11 is controlled until the type to be cut off is set on the type carrier 5 in the cutting position. Thereafter - or even shortly before the end of the setting function - the control device 9 sends a trigger signal for energizing the winding 3 to build up a magnetic field acting in the direction of knockdown to an electronic switch 15 which connects a voltage pulse 12 (FIG. 2A) to the winding 3 .
  • the print hammer 2 is thereby accelerated in the tapping direction and hits the back of the type carrier 5 at a certain speed and energy, whereby the type is imprinted and part of the energy is delivered to the type carrier 5, ink ribbon 6, recording medium 7 and pressure abutment 8 .
  • the impact is indicated by line 13 in FIG.
  • the print hammer 2 rebounds with the residual energy and would run back to its rest position at a rear stop 14 with the resulting speed, supported by the magnetic field of the permanent magnet 4.
  • the control device 9 sends a signal which triggers a winding in the reverse direction to the electronic switch 15, which then switches on a voltage pulse 16 of reversed polarity to the winding 3.
  • the print hammer 2 is thereby moved back at an increased speed out of the setting range of the type carrier 5 and into its rest position at the rear stop 14.
  • the winding 3 is connected to an edge detector 19, by means of which the voltage jump of the induced voltage when the pressure hammer 2 strikes in the tapping position is registered and converted into an output signal 20, FIG. 2B.
  • the output signal 20 is fed to the control device 9, which then outputs the signal for applying the voltage pulse 16 of opposite polarity to the electronic switch 15.
  • the voltage pulse 16 is thus applied to the winding 3 immediately after the fluctuating influences of the recording medium type and thickness, the roller spacing etc. immediately after the voltage jump occurs in the induced voltage.
  • a voltage is induced which has approximately the course designated by 21.
  • the path of the print hammer 2 is plotted over the time line t in FIG. 2C, the dashed line indicating the time required for returning to the rest position without recirculation.
  • the mode of operation of the back-energization described in the example and the detection of the optimal time for switching on the back-energization is not limited to dynamic tee systems, the function of which is based on the interaction of a permanently magnetic and an electromagnetically generated field, it also applies to all simple electromagnetic tee systems.
  • the recognition of the tee time which is important for the optimal triggering point of the return current, can be carried out in all tee systems in which a voltage corresponding to the hammer movement can be induced in a winding directly or indirectly.
  • a fade-out circuit or function may have to be provided, of which only voltage jumps after the forward voltage pulse has ended and before the reverse one begins Voltage pulse are allowed for evaluation, so z. B. by switching the Voltage pulses generated voltage jumps do not trigger unwanted reverse current.
  • Mechanical or electrical damping measures may also have to be taken at the rear stop 14 of the pressure hammer 2, which prevent disturbing bouncing phenomena.
  • the use of a - e.g. B. shaped by an RC element - contribute voltage pulse with decaying course for the back current.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Impact Printers (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Earth Drilling (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)

Description

Die Erfindung betrifft eine Schreib- oder ähnliche Maschine mit einem Typenabschlagsystem der im Oberbegriff des Patentanspruchs 1 angegebenen Art, bei dem ein Druckhammer elektromagnetisch betätigbar ist.The invention relates to a typewriter or similar machine with a type tee system of the type specified in the preamble of claim 1, in which a print hammer can be actuated electromagnetically.

Bei derartigen elektromagnetischen Abschlagsystemen wird ein Druckhammer durch einen kurzen, an eine Wicklung angelegten Spannungsimpuls aus seiner Ruhestellung zu einer Abschlagposition beschleunigt, wo unter Zwischenschaltung eines Farbbandes ein Abdruck einer Type auf einem Aufzeichnungsträger erfolgt. Die abzudruckende Type ist hierbei z. B. unmittelbar auf dem Druckhammer oder auf einem vor dem Abdruck voreinzustellenden Typenträger, etwa einer Typenscheibe, angeordnet. Die Rückkehr des Druckhammers in die Ruhestellung erfolgt dann durch die beim Aufprall auf das Druckwiderlager umgekehrte kinetische Energie und wird - wenn für eine schnellere Wiedereinsetzbarkeit des Druckhammers eine schnellere Rückkehr erforderlich ist - durch die Kraft einer Feder unterstützt. Die Anordnung einer solchen Feder wirkt sich aber andererseits bei der Abschlagbewegung nachteilig aus, weil deren Rückstellkraft zusätzlich überwunden werden muß.In such electromagnetic tapping systems, a print hammer is accelerated from its rest position to a tapping position by a short voltage pulse applied to a winding, where a type is imprinted on a recording medium with the interposition of an ink ribbon. The type to be printed is z. B. directly on the print hammer or on a type carrier to be preset before the impression, such as a type plate. The return of the pressure hammer to the rest position is then carried out by the kinetic energy reversed upon impact with the pressure abutment and is supported by the force of a spring - if a faster return is required for a quicker reinsertion of the pressure hammer. The arrangement of such a spring, on the other hand, has a disadvantageous effect on the striking movement because its restoring force must also be overcome.

Sogenannte elektrodynamische Abschlagsysteme, wie sie z. B. aus der DE-A-3 038 881 bekannt sind, vermeiden diesen Nachteil. Hier wird von Permanentmagneten ein magnetisches Feld erzeugt, in dem der Druckhammer in Abschlagrichtung bewegbar gelagert ist. Außerdem ist eine Wicklung vorgesehen, an die der den Abschlag auslösende Spannungsimpuls angelegt wird. Das entgegengesetzt zu den Permanentmagneten wirkende, durch die Wicklung erzeugte magnetische Feld verursacht eine Beschleunigung des Druckhammers in die Abschlagposition, und die Rückbewegung des Druckhammers in die Ruhestellung wird, bei beendetem Spannungsimpuls in der Wicklung, vom magnetischen Feld der Permanentmagnete unterstützt.So-called electrodynamic teeing systems, such as. B. are known from DE-A-3 038 881, avoid this disadvantage. Here, permanent magnets generate a magnetic field in which the print hammer is mounted so that it can move in the tapping direction. In addition, a winding is provided, to which the voltage pulse triggering the reduction is applied. The magnetic field generated by the winding, which acts counter to the permanent magnets, causes the print hammer to accelerate into the knock-off position, and the return movement of the print hammer to the rest position is supported by the magnetic field of the permanent magnets when the voltage pulse in the winding has ended.

Durch die US-A-4 273 039 ist auch eine Rückführung des Druckhammers aus der Abschlagposition in die Ruhestellung bekannt, wozu ein die Rückkehrbewegung bewirkender Spannungsimpuls umgekehrter Polarität an eine Wicklung gelegt wird. Die Steuerung des Zeitpunktes, in dem der Rückbestromungsimpuls angelegt wird, erfolgt hierbei über ein zusätzliches Zeitverzögerungsglied.From US-A-4 273 039 a return of the printing hammer from the knock-off position to the rest position is also known, for which purpose a voltage pulse of reversed polarity which causes the return movement is applied to a winding. An additional time delay element controls the point in time at which the return current pulse is applied.

Weiterhin zeigt die WO-A-80/00552 einen elektromagnetisch betätigbaren Druckhammer und eine Steuereinrichtung, von der das Anlegen von die Abschlagbewegungen bewirkenden Spannungsimpulsen an die Wicklung des Typenabschlagsystems steuerbar ist. Hierbei wird für eine Rückführung des Druckhammers aus der Abschlagposition in die Ruhestellung ein die Rückkehrbewegung bewirkender Spannungsimpuls umgekehrter Polarität an die Wicklung angelegt. Das Anlegen dieses Spannungsimpulses für die Rückbestromung wird hierbei aber nicht vom Erkennen des Auftreffens des Druckhammers in die Abschlagposition abhängig gemacht.Furthermore, WO-A-80/00552 shows an electromagnetically actuated print hammer and a control device, by means of which the application of voltage pulses which cause the striking movements to the winding of the type striking system can be controlled. In this case, a voltage pulse of reversed polarity, causing the return movement, is applied to the winding for returning the print hammer from the knock-off position to the rest position. The application of this voltage pulse for the return current is not made dependent on the detection of the impact of the printing hammer in the tee position.

Der Erfindung liegt die Aufgabe zugrunde, den Druckhammer eines Abschlagsystems eingangs genannter Art derart anzusteuern, daß die Abschlagbewegungen schneller aufeinanderfolgen können.The invention has for its object to control the hammer of a tee system of the type mentioned in such a way that the tee movements can follow each other faster.

Diese Aufgabe wird durch die im Patentanspruch 1 angegebenen Merkmale gelöst.This object is achieved by the features specified in claim 1.

Die Vorteile der Erfindung bestehen insbesondere darin, daß ein schnelleres Druckwerk geschaffen werden kann, weil der Druckhammer schneller aus dem Einstellbereich des Typenträgers herausbewegt wird und somit ein sofortiges Einstellen des Typenträgers auf eine neue abzudruckende Type möglich ist, und weil der Druckhammer schneller seine Ruheposition erreicht und für eine neue Auslösung eines Abdrucks bereit ist. Da außerdem bei der Abschlagbewegung keine Rückstellkraft zu überwinden ist, kommt das Abschlagsystem mit einem relativ kleinen Abschlagmagneten und kleiner Ansteuerspannung aus.The advantages of the invention consist in particular in that a faster printing unit can be created because the print hammer is moved faster out of the setting range of the type support and thus an immediate setting of the type support to a new type to be printed is possible, and because the print hammer reaches its rest position more quickly and is ready for a new triggering of an impression. In addition, since there is no restoring force to be overcome during the striking motion, the striking system manages with a relatively small striking magnet and a small control voltage.

In einer vorteilhaften Weiterbildung, gemäß der das Anlegen des Spannungsimpulses für die Rückbestromung vom Erkennen des Auftreffens des Druckhammers in der Abschlagposition abhängig gemacht wird, kann der Zeitpunkt des Durchschaltens der Rückbestromung optimal gelegt werden. Es besteht dadurch keine Abhängigkeit mehr vom Abstand zwischen Druckwiderlager und Druckhammer, von der Dicke und Härte des Aufzeichnungsträgers und von Fertigungs- und Betriebstoleranzen.In an advantageous development, according to which the application of the voltage pulse for the return current is made dependent on the detection of the impact of the printing hammer in the knock-off position, the point in time at which the return current is switched on can be optimally set. As a result, there is no longer any dependency on the distance between the pressure abutment and the print hammer, on the thickness and hardness of the recording medium and on manufacturing and operating tolerances.

Weitere Vorteile der Erfindung ergeben sich aus den Unteransprüchen sowie der nachfolgenden Beschreibung eines Ausführungsbeispiels. Es zeigen

  • Figur 1 ein Blockschaltbild und
  • Figur 2 ein Diagramm.
Further advantages of the invention result from the subclaims and the following description of an exemplary embodiment. Show it
  • Figure 1 is a block diagram and
  • Figure 2 is a diagram.

Das Blockschaltbild der Figur 1 zeigt das elektromagnetische Abschlagsystem einer Schreibmaschine sowie die zugehörige Steuereinrichtung mit den zum Verständnis der Erfindung erforderlichen Einzelheiten. Das Abschlagsystem 1 gehört zum sogenannten dynamischen Typ, der neben einem Druckhammer 2 sowohl eine Wicklung 3 a)s auch einen Permanentmagneten 4 aufweist, wobei die Wicklung 3 auf dem im magnetischen Feld des Permanentmagneten 4 in Abschlagrichtung bewegbar gelagerten Druckhammer 2 angeordnet ist. Ein an die Wicklung 3 angelegter Spannungsimpuls bewirkt eine schlagartige Beschleunigung des Druckhammers 2 in Richtung auf die voreingestellte Drucktype eines von einem Typenrad gebildeten Typenträgers 5, wodurch das abzubildende Zeichen in bekannter Weise mittels eines Farbbandes 6 auf einem Aufzeichnungsträger 7 abgeschlagen wird, der vor einem Druckwiderlager 8 angeordnet ist.The block diagram of FIG. 1 shows the electromagnetic tapping system of a typewriter and the associated control device with the details necessary for understanding the invention. The tee system 1 belongs to the so-called dynamic type, which in addition to a printing hammer 2 has both a winding 3 a) s and a permanent magnet 4, the winding 3 being arranged on the printing hammer 2 which is movably mounted in the magnetic field of the permanent magnet 4 in the tee direction. A voltage pulse applied to the winding 3 causes the pressure hammer 2 to accelerate suddenly in the direction of the preset pressure type of a type carrier 5 formed by a type wheel, whereby the character to be imaged is knocked off in a known manner by means of an ink ribbon 6 on a recording medium 7 which is arranged in front of a print abutment 8.

Sowohl die Einstellung des Typenträgers 5 auf die jeweils abzuschlagende Type als auch das Anlegen des Spannungsimpulses an die Wicklung 3 zur Auslösung des Typenabschlages wird von einer Steuereinrichtung 9 gesteuert, die in ebenfalls bekannter Weise von einem Mikrocomputer gebildet wird. Um den Abschlag einer abzubildenden Type zu bewerkstelligen, gibt die Steuereinrichtung 9 also zunächst die nötigen Ansteuersignale an eine Motor-Ansteuerschaltung 10, von der der Einstellmotor 11 so lange angesteuert wird, bis die abzuschlagende Type auf dem Typenträger 5 in die Abschlagposition eingestellt ist. Danach - oder auch schon kurz vor Beendigung der Einstellfunktion - gibt die Steuereinrichtung 9 ein Auslösesignal für eine Bestromung der Wicklung 3 zum Aufbau eines in Abschlagrichtung wirkenden magnetischen Feldes an einen elektronischen Schalter 15, der einen Spannungsimpuls 12 (Figur 2A) an die Wicklung 3 durchschaltet.Both the setting of the type carrier 5 to the type to be rejected as well as the application of the voltage pulse to the winding 3 to trigger the type discount is controlled by a control device 9, which is also formed in a known manner by a microcomputer. In order to manage the discounting of a type to be mapped, the control device 9 first of all sends the necessary control signals to a motor control circuit 10, from which the setting motor 11 is controlled until the type to be cut off is set on the type carrier 5 in the cutting position. Thereafter - or even shortly before the end of the setting function - the control device 9 sends a trigger signal for energizing the winding 3 to build up a magnetic field acting in the direction of knockdown to an electronic switch 15 which connects a voltage pulse 12 (FIG. 2A) to the winding 3 .

Der Druckhammer 2 wird dadurch in Abschlagrichtung beschleunigt und trifft mit einer bestimmten Geschwindigkeit und Energie auf der Rückseite des Typenträgers 5 auf, wodurch der Abdruck der Type bewirkt wird und ein Teil der Energie an Typenträger 5, Farbband 6, Aufzeichnungsträger 7 und Druckwiderlager 8 abgegeben wird. Das Auftreffen ist in Figur 2 durch die Linie 13 gekennzeichnet. Nach dem Auftreffen prallt der Druckhammer 2 mit der Restenergie zurück und würde mit der daraus herrührenden Geschwindigkeit, unterstützt vom magnetischen Feld des Permanentmagneten 4, in seine Ruhestellung an einem hinteren Anschlag 14 zurücklaufen. Um diesen Vorgang zu beschleunigen, gibt die Steuereinrichtung 9 ein eine in Rückwärtsrichtung wirkende Bestromung der Wicklung 3 auslösendes Signal an den elektronischen Schalter 15, der daraufhin einen Spannungsimpuls 16 umgekehrter Polarität an die Wicklung 3 durchschaltet. Der Druckhammer 2 wird dadurch mit erhöhter Geschwindigkeit aus dem Einstellbereich des Typenträgers 5 und in seine Ruhestellung am hinteren Anschlag 14 zurückbewegt.The print hammer 2 is thereby accelerated in the tapping direction and hits the back of the type carrier 5 at a certain speed and energy, whereby the type is imprinted and part of the energy is delivered to the type carrier 5, ink ribbon 6, recording medium 7 and pressure abutment 8 . The impact is indicated by line 13 in FIG. After impact, the print hammer 2 rebounds with the residual energy and would run back to its rest position at a rear stop 14 with the resulting speed, supported by the magnetic field of the permanent magnet 4. In order to accelerate this process, the control device 9 sends a signal which triggers a winding in the reverse direction to the electronic switch 15, which then switches on a voltage pulse 16 of reversed polarity to the winding 3. The print hammer 2 is thereby moved back at an increased speed out of the setting range of the type carrier 5 and into its rest position at the rear stop 14.

Zur optimalen Steuerung des Zeitpunktes, in dem der Rückbestromungsimpuls 16 angelegt wird, wird davon Gebrauch gemacht, daß durch den Bewegungsablauf des Druckhammers 2 in der Wicklung 3 eine Spannung induziert wird. Der Verlauf dieser induzierten Spannung zeigt nach Abschalten des Vorwärts-Beschleunigungsimpulses 12 den in Figur 2A angenähert dargestellten Verlauf 17 der bei Auftreffen des Druckhammers 2 in der Abschlagposition (Linie 13) durch das Stoppen und die Umkehr des Druckhammers 2 einen Spannungssprung aufweist. Ohne einen nachfolgenden, in Rückwärtsrichtung wirkenden Spannungsimpuls entgegengesetzter Polarität wurde die induzierte Spannung ungefähr den mit 18 bezeichneten Verlauf aufweisen, bis der Druckhammer 2 seine Ruhestellung erreicht hat.In order to optimally control the point in time at which the return current pulse 16 is applied, use is made of the fact that a voltage is induced in the winding 3 by the movement sequence of the pressure hammer 2. After the forward acceleration pulse 12 has been switched off, the course of this induced voltage shows the course 17 shown approximately in FIG. 2A, which shows a voltage jump when the print hammer 2 strikes the knock-off position (line 13) by stopping and reversing the print hammer 2. Without a subsequent, reverse-acting voltage pulse of opposite polarity, the induced voltage would have approximately the course designated 18 until the print hammer 2 has reached its rest position.

Die Wicklung 3 ist mit einem Flankendetektor 19 verbunden, von dem der Spannungssprung der induzierten Spannung beim Auftreffen des Druckhammers 2 in der Abschlagposition registriert und in ein Ausgangssignal 20, Figur 2B, umgesetzt wird. Das Ausgangssignal 20 wird der Steuereinrichtung 9 zugeführt, die daraufhin das Signal zum Anlegen des Spannungsimpulses 16 entgegengesetzter Polarität an den elektronischen Schalter 15 abgibt. Der Spannungsimpuls 16 wird somit unabhängig von den schwankenden Einflüssen der Aufzeichnungsträgerart und -dicke, des Walzenabstandes usw. unmittelbar nach Auftreten des Spannungssprunges in der induzierten Spannung an die Wicklung 3 angelegt. Dadurch wird nach Beendigung des Spannungsimpulses 16 eine Spannung induziert, die angenähert den mit 21 bezeichneten Verlauf aufweist. Zur Verdeutlichung der dadurch erreichten schnelleren Rückkehr des Druckhammers 2 in seine Ruhestellung ist in Figur 2C der Weg des Druckhammers 2 über der Zeitlinie t aufgetragen, wobei der gestrichelte Verlauf den Zeitbedarf für eine Rückführung in die Ruhestellung ohne Rückbestromung kennzeichnet.The winding 3 is connected to an edge detector 19, by means of which the voltage jump of the induced voltage when the pressure hammer 2 strikes in the tapping position is registered and converted into an output signal 20, FIG. 2B. The output signal 20 is fed to the control device 9, which then outputs the signal for applying the voltage pulse 16 of opposite polarity to the electronic switch 15. The voltage pulse 16 is thus applied to the winding 3 immediately after the fluctuating influences of the recording medium type and thickness, the roller spacing etc. immediately after the voltage jump occurs in the induced voltage. As a result, after the end of the voltage pulse 16, a voltage is induced which has approximately the course designated by 21. To illustrate the quicker return of the print hammer 2 to its rest position achieved in this way, the path of the print hammer 2 is plotted over the time line t in FIG. 2C, the dashed line indicating the time required for returning to the rest position without recirculation.

Die im Beispiel beschriebene Wirkungsweise der Rückbestromung sowie des Erkennens des optimalen Zeitpunktes für das Einschalten der Rückbestromung ist nicht auf dynamische Abschlagsysteme, deren Funktion auf dem Zusammenwirken eines permanentmagnetisch und eines elektromagnetisch erzeugten Feldes beruht, beschränkt, sie hat auch bei allen einfachen elektromagnetischen Abschlagsystemen Gültigkeit. Insbesondere ist die für den optimalen Auslösezeitpunkt der Rückbestromung wichtige Erkennung des Abschlagzeitpunktes bei allen Abschlagsystemen durchführbar, bei denen mittel- oder unmittelbar eine der Hammerbewegung entsprechende Spannung in einer Wicklung induziert werden kann. Auch die Verwendung einer eigenen Meßwicklung, eventuell in Kombination mit Permanentmagneten, die lediglich zur Abnahme einer durch die Hammerbewegung erzeugten induzierten Spannung für eine Auswertung zu Steuerzwecken vorgesehen ist, führt zum gewünschten Erfolg.The mode of operation of the back-energization described in the example and the detection of the optimal time for switching on the back-energization is not limited to dynamic tee systems, the function of which is based on the interaction of a permanently magnetic and an electromagnetically generated field, it also applies to all simple electromagnetic tee systems. In particular, the recognition of the tee time, which is important for the optimal triggering point of the return current, can be carried out in all tee systems in which a voltage corresponding to the hammer movement can be induced in a winding directly or indirectly. The use of an own measuring winding, possibly in combination with permanent magnets, which is only provided for the reduction of an induced voltage generated by the hammer movement for an evaluation for control purposes, leads to the desired success.

Der Vollständigkeit halber wird noch darauf hingewiesen, daß bei Verwendung der Wicklung für die Abschlagbewegung des Druckhammers als Meßwicklung für die induzierte Spannung eventuell eine Ausblendeschaltung oder -funktion vorgesehen werden muß, von der nur Spannungssprünge nach Beendigung des vorwärts gerichtete Spannungsimpulses und vor Beginn des rückwärts gerichteten Spannungsimpulses zur Auswertung zugelassen werden, damit z. B. durch das Durchschalten der Spannungsimpulse erzeugte Spannungssprünge keine ungewollte Rückbestromung auslösen. Auch müssen eventuell am hinteren Anschlag 14 des Druckhammers 2 mechanische oder elektrische Dämpfungsmaßnahmen getroffen werden, die störende Prellerscheinungen verhindern. Dazu kann auch die Verwendung eines - z. B. durch ein RC-Glied geformten - Spannungsimpulses mit abklingendem Verlauf für die Rückbestromung beitragen.For the sake of completeness, it is pointed out that when using the winding for the tapping movement of the printing hammer as a measuring winding for the induced voltage, a fade-out circuit or function may have to be provided, of which only voltage jumps after the forward voltage pulse has ended and before the reverse one begins Voltage pulse are allowed for evaluation, so z. B. by switching the Voltage pulses generated voltage jumps do not trigger unwanted reverse current. Mechanical or electrical damping measures may also have to be taken at the rear stop 14 of the pressure hammer 2, which prevent disturbing bouncing phenomena. The use of a - e.g. B. shaped by an RC element - contribute voltage pulse with decaying course for the back current.

Claims (4)

1. Typewriter or similar machine with a system for striking characters, in which a print hammer (2) for striking characters onto a recording medium (7) arranged in front of an abutment (8) is activated directly electromagnetically, and with a control device by which the transmission of the voltage impulses causing the strking movements to the coil (3) of the system for printing characters is controlled, wherein a voltage impulse (16) of reversed polarity may be applied to the coil, causing the return of the print hammer (2) from its strike position to its rest position, characterised in that an arrangement is provided registering the arrival of the print hammer at its strike position, and generating an output signal (20), with a measuring coil in the region of influence of the print hammer (2), in which coil a voltage is (17, 21) inducible by a movement of the print hammer (2), and that the coil (3) for the striking movement of the print hammer (2) is provided as a measuring coil, and with a switching arrangement for conducting away an output signal (20) from the voltage jump induced by the arrival of the print hammer (2) at its strike position, to activate the voltage impulse (16) of reverse polarity.
2. Typewriter or similar machine according to claim 1, characterised in that the coil (3) is connected to a signal slope detector for conducting away the output signal (20) from the induced voltage jump.
3. Typewriter or similar machine according to claim 1 or 2, characterised in that an electrodynamic striking system (1) is provided with a magnetic field produced by a permanent magnet and a coil (3), wherein the permanent magnet (4) or the coil (3) is coupled to the movement of the print hammer (2).
4. Typewriter or similar machine according to claim 3, characterised in that one of the permanent magnet (4) and the coil (3) is arranged on the print hammer (2) and the other is arranged to be stationary along the path of movement of the print hammer.
EP83108455A 1982-12-04 1983-08-27 Character printing device for a typewriter or the like Expired EP0110020B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823244936 DE3244936A1 (en) 1982-12-04 1982-12-04 TYPE DISCOUNTING SYSTEM OF A WRITING OR SIMILAR MACHINE
DE3244936 1982-12-04

Publications (3)

Publication Number Publication Date
EP0110020A2 EP0110020A2 (en) 1984-06-13
EP0110020A3 EP0110020A3 (en) 1986-01-08
EP0110020B1 true EP0110020B1 (en) 1989-03-08

Family

ID=6179822

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83108455A Expired EP0110020B1 (en) 1982-12-04 1983-08-27 Character printing device for a typewriter or the like

Country Status (4)

Country Link
US (1) US4842429A (en)
EP (1) EP0110020B1 (en)
JP (1) JPS59155074A (en)
DE (2) DE3244936A1 (en)

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3172353A (en) * 1963-06-17 1965-03-09 Data Products Corp Variable force hammer high speed printer
DE1613163A1 (en) * 1967-04-12 1970-05-21 Ibm Deutschland Device for driving a link with reversible direction of movement
US3543906A (en) * 1967-08-21 1970-12-01 Edward J Buxton Solenoid controlled printing hammer mechanism
US3905294A (en) * 1973-02-16 1975-09-16 Pertec Corp High speed line printing apparatus
NL177294C (en) * 1977-11-03 1985-09-02 Philips Nv PRESSER, EQUIPPED WITH A STROKE DEVICE WITH RECORDER.
US4221163A (en) * 1978-09-01 1980-09-09 Ncr Corporation Magnetic hysteresis driven recording element and method
DE2939829A1 (en) * 1978-11-09 1980-05-22 Seitz Sa DRIVING DEVICE FOR A PRINT ORGAN OF A FAST PRINTER
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
US4306207A (en) * 1980-05-07 1981-12-15 Hosiden Electronics Co., Ltd. Self-sustaining solenoid
US4347789A (en) * 1980-07-15 1982-09-07 Occidental Oil Shale, Inc. Downhole delay assembly for blasting with series delay
DE3038881A1 (en) * 1980-10-15 1982-05-19 Olympia Werke Ag, 2940 Wilhelmshaven Electrodynamic print mechanism hammer arrangement - produces reciprocal motion between base and cover plates using excitation coil
US4348119A (en) * 1980-11-06 1982-09-07 General Electric Company Bounce control system for moving coil printing element
DE3267952D1 (en) * 1981-03-21 1986-01-30 Vacuumschmelze Gmbh Magnetic drive system for producing linear movements
US4429342A (en) * 1981-04-24 1984-01-31 Siemens Aktiengesellschaft Impact printing device with an improved print hammer

Also Published As

Publication number Publication date
JPS59155074A (en) 1984-09-04
DE3244936A1 (en) 1984-06-07
DE3379324D1 (en) 1989-04-13
US4842429A (en) 1989-06-27
EP0110020A2 (en) 1984-06-13
EP0110020A3 (en) 1986-01-08

Similar Documents

Publication Publication Date Title
DE2847492C2 (en) Circuit arrangement in a printing unit with a pusher device
DE3036919C2 (en) Print hammer drive for a dot matrix printer
EP0064632B1 (en) Print hammer device
DE2131710A1 (en) High-speed printer with pulse controllable print hammer
EP0408122B1 (en) Circuit for a matrix printer
EP0110020B1 (en) Character printing device for a typewriter or the like
DE3116402C2 (en) Low rebound plunger magnet system
DE2230224C2 (en) Print hammer unit
EP0816855B1 (en) Inductive acceleration sensor
DE3739295C1 (en) Rebound damping method for print hammer magnets in typewriters or similar office machines
DE3401420C2 (en)
DE2521720C3 (en) Circuit arrangement for controlling a hammer bank of an impact printer
DE69001911T2 (en) DRIVER CIRCUIT FOR A WIRE POINT PUSH BUTTON.
DE3228546A1 (en) PRINT WORK
DE3116430C2 (en) Hammer pressure device with a plunger magnet system containing an optoelectronic sensor
DE3854199T2 (en) PRINTING DEVICE WITH POINT STOP.
DE2131424A1 (en) Electromagnetic actuator
EP0326781A1 (en) Printer drive
CH448578A (en) Registration device in a vehicle
DE3148503C2 (en) Plunging armature magnet system with a composite armature with high propulsive force
DE1549807A1 (en) Tongue operated printer
DE2933616A1 (en) DAMPING DEVICE FOR THE ELECTROMAGNETIC DRIVE OF THE PRINT HAMMER IN A PRINT HAMMER ARRANGEMENT
DE2935939C2 (en)
AT224367B (en)
DE2264068A1 (en) PRINTING DEVICE

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): CH DE FR GB IT LI SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): CH DE FR GB IT LI SE

17P Request for examination filed

Effective date: 19860217

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: OLYMPIA AKTIENGESELLSCHAFT

17Q First examination report despatched

Effective date: 19870731

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: AEG OLYMPIA AKTIENGESELLSCHAFT

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE FR GB IT LI SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19890308

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
REF Corresponds to:

Ref document number: 3379324

Country of ref document: DE

Date of ref document: 19890413

ET Fr: translation filed
ITF It: translation for a ep patent filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19890827

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19890831

Ref country code: CH

Effective date: 19890831

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19900427

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19900501

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST