EP0017753B1 - Ink ribbon transporting and reversing device - Google Patents

Ink ribbon transporting and reversing device Download PDF

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Publication number
EP0017753B1
EP0017753B1 EP80101248A EP80101248A EP0017753B1 EP 0017753 B1 EP0017753 B1 EP 0017753B1 EP 80101248 A EP80101248 A EP 80101248A EP 80101248 A EP80101248 A EP 80101248A EP 0017753 B1 EP0017753 B1 EP 0017753B1
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EP
European Patent Office
Prior art keywords
ribbon
ink
pinion
arm
worm wheel
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
EP80101248A
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German (de)
French (fr)
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EP0017753A2 (en
EP0017753A3 (en
Inventor
Werner Wüthrich
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.)
Ascom Autelca AG
Autelca AG
Original Assignee
Ascom Autelca AG
Autelca AG
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Publication of EP0017753A2 publication Critical patent/EP0017753A2/en
Publication of EP0017753A3 publication Critical patent/EP0017753A3/en
Application granted granted Critical
Publication of EP0017753B1 publication Critical patent/EP0017753B1/en
Expired 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
    • B41J33/00—Apparatus or arrangements for feeding ink ribbons or like character-size impression-transfer material
    • B41J33/14—Ribbon-feed devices or mechanisms
    • B41J33/16—Ribbon-feed devices or mechanisms with drive applied to spool or spool spindle
    • B41J33/22—Ribbon-feed devices or mechanisms with drive applied to spool or spool spindle by gears or pulleys
    • 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
    • B41J33/00—Apparatus or arrangements for feeding ink ribbons or like character-size impression-transfer material
    • B41J33/14—Ribbon-feed devices or mechanisms
    • B41J33/40—Ribbon-feed devices or mechanisms with arrangements for reversing the feed direction
    • B41J33/44—Ribbon-feed devices or mechanisms with arrangements for reversing the feed direction automatically

Definitions

  • the invention relates to an ink ribbon transport and switching device of the type specified in the preamble of claim 1.
  • each sensor is formed by a ribbon deflector at one end of a longitudinally displaceably mounted rod which carries the control curve.
  • the ink ribbon is deflected at an obtuse angle on each of the deflection elements, while it runs at a distance from the other deflection element.
  • a component of the tensile force exerted by the drive motor on the ribbon strives to push the rod back, as a result of which the deflection would be canceled.
  • the rod is equipped with a cam with oblique flanks and a plunger loaded by a spring is provided, which presses against the flank facing away from the deflection and thus counteracts this force component.
  • the drive motor exerts a greater tensile force on the ribbon, which also increases the force component initially. This is intended to move the rod against the force that the plunger exerts on the cam flank, so that the plunger runs over the apex of the cam and then engages the other cam flank to push the rod so that the ribbon on the other Deflector is deflected.
  • the force that the displacement is supposed to cause would initially become smaller and smaller because the deflection angle would become larger and finally an almost elongated angle, and at the same time the force counteracting the displacement and exerted by the tappet via the cam flank would increase because the spring is increasingly tensioned becomes.
  • the rod is to be displaced by a force that decreases during its displacement against a force that increases during its displacement.
  • the other deflecting element may touch the ink ribbon at the earliest when the tappet crosses the apex of the cam and because the displacement path sections of the rod on both sides of the cam apex must be of the same length in order to achieve the same deflection in each case, it is inevitable that the deflection angle with the spring under maximum tension is an almost elongated angle, the force component mentioned being extraordinarily small, while the spring exerts its greatest counterforce.
  • the spring cannot be dimensioned weak, because it has to be sufficient to ensure the deflection of the running ink ribbon, and the slope of the cam can not be dimensioned small, because it has to be sufficient to move the rod further after the cam vertex is exceeded, and because a tappet acting on a cam flank is not effective with a low flank steepness. Therefore, the device can hardly function according to this proposal, at least there are serious, fundamental concerns about its usability.
  • the invention seeks to remedy this.
  • the invention as characterized in the claims, solves the problem of creating a structurally simple and inexpensive ribbon transport and switching device, in which the ribbon transport direction is reliably switched both when a ribbon end is running and in the event of vibrations or after switching off and on again Drive motor is unchanged.
  • the advantages achieved by the invention are essentially to be seen in the fact that not only a part of a partially stored component, but the entire tractive force acting on the running part of the ribbon, which is transmitted from the drive motor to the ribbon, is used directly for switching the ribbon transport direction, the Cams on the control cam can be easily overcome and still be dimensioned so that the respective position of the reversing switch is reliably maintained even in the event of strong shocks and impacts.
  • the ribbon forks and the control cam are arranged on lever arms so that the lever ratio can be used.
  • the pinion between the ring gears is prevented from running empty by dimensioning the frictional resistances according to the invention.
  • the attachment of the running ribbon part to the ribbon reel is not claimed when switching over and the drive motor is reversed without being prevented from rotating beforehand, as is required in the device proposed in FR-A-208682.
  • the ribbon transport and switching device is characterized by simplicity and reliability.
  • a ribbon transport and switching device is known with an electric drive motor for ribbon transport which is reversible for switching the ribbon transport direction and which has two ribbon forks, each of which can be actuated by a driver at one end of the ribbon (GB-A-1532012).
  • this device is of a different generic type and does not achieve the object on which the invention is based. With it, the ribbon is always transported in the same direction each time the drive motor is switched off and on again, which leads to wear that is distributed unevenly over the length of the ribbon and thus to a shorter service life of the ribbon, because a partially worn ribbon is then no longer can be used if it still has usable areas.
  • the ribbon is invented device according to the invention is transported after each switching off and on again in the direction in which it was previously transported, so that it is used uniformly over its entire length.
  • the two ribbon forks of the known device (GB-A-1532012) are completely independent of one another.
  • a reversing relay with changeover contacts is used to reverse the drive motor.
  • One ribbon fork actuates a lever that acts on a push button switch with make contact
  • the other ribbon fork actuates another lever that acts on another push button switch with normally closed contact.
  • the make and break contacts are in series with the winding of the reversing relay, which has a hold contact in addition to the changeover contacts, which is connected in parallel with the make contact and is closed when the winding is energized.
  • the winding then remains de-energized regardless of the state of the normally closed contact because the holding contact is now open. This is necessary because the ribbon no longer acts on the ribbon fork belonging to the normally closed contact after reversing its transport direction, so that the normally closed contact closes again, whereupon the winding circuit is closed again and the ribbon transport direction would be switched back immediately if the holding contact was not open would.
  • the winding of the reversing relay is always de-energized, the drive motor then runs in the direction corresponding to this state of the reversing relay, regardless of the direction in which the ribbon was transported before the device was switched off, whereby the object on which the invention is based, as mentioned, is not achieved.
  • 1 and 2 denote the two ribbon reel carriers. These each have a ring gear 3 or 4.
  • the drive motor 5 drives a pinion 8 via a worm 6 and a worm wheel 7, which meshes with the ring gear 3 (in its drawn position) so that the ribbon reel carrier 1 rotates in the direction of the arrow.
  • the ink ribbon 9 is wound onto the ink ribbon reel 10 sitting on the ink ribbon reel carrier 1 and is pulled off from the ink ribbon reel 11 sitting on the other ink ribbon reel carrier 2.
  • the ribbon 9 runs from the spool 11 over a deflection roller 12 and through an ink ribbon fork 13 to the point at which printing is carried out by means of the ink ribbon and further through an ink ribbon fork 14 and a deflection roller 15 to the spool 10 on the driven bobbin 1 the ribbon run between the forks 13 and 14, which is not essential to the invention, is not shown.
  • the ink ribbon transport direction is automatically reversed, as explained further below, by reversing the direction of rotation of the drive motor 5, whereupon the pinion 8 then meshes with the ring gear 4 of the spool carrier 2 , and the ink ribbon 9 is drawn off the spool 10 and wound onto the spool 11, which is seated on the now driven spool carrier 2.
  • the ribbon fork 13 is attached to the free end of an arm 17 of a two-armed lever 17, 18, the other ribbon fork 14 is attached to the free end of an arm 19 of a three-armed lever 19, 20, 21.
  • the lever 17, 18 is arranged between the base plate 22 and the coil carrier 2 and can be pivoted about an axle 23 on which the coil carrier 2 is also rotatably mounted.
  • the lever 19, 20, 21 can be pivoted about an axle 24 on which the coil carrier 1 is also rotatably mounted.
  • the lever arms 18 and 20 are connected to one another in an articulated manner by a push rod 25.
  • the free end of the lever arm 21 forms a curve carrier 27. Its curve has two sections 28 and 29. The curve section 28 runs in a smaller and the curve section 29 runs at a greater distance from the ring gear 3. The curve carrier has between these two sections 28 and 29 27 a cam 30.
  • a roller 31 (or another suitable organ, for example a cam) runs on the curve 28, 29, 30.
  • the bearing of the roller 31 is connected to the actuating member of a reversing or reversing switch 32 (to be actuated against a spring force) for switching the direction of rotation of the motor 5. In the illustrated position of the switch 32, the roller 31 is located on the curve section 28.
  • the motor 5, on the shaft of which the worm 7 is seated, runs in the direction of rotation shown in FIG.
  • the worm wheel 7 and the pinion 8, which in the example shown consist of one piece, are mounted on the free end of a lever arm 35 which can be pivoted about a pin 36.
  • the pivotability is limited by two stops 37 and 38.
  • the pinion 8 properly meshes with the ring gear 3 (i.e. the pitch circles of both touch each other). If the arm 35 lies on the other stop 38, the pinion 8 'meshes properly with the other ring gear 4.
  • the thread of the worm 6 engages in the toothing of the worm wheel 7 within permissible tolerances. To facilitate this , the arm 35 is made as long as possible.
  • the thrust that the worm 6 exerts on the worm wheel 7 and thus on the free end of the arm 35 must be so great that the arm, depending on the direction of rotation of the worm 6, from the position shown in which it is on Stop 37 abuts, in its other position, not shown, in which it bears against stop 38, is reliably pivoted.
  • the pinion 8 which is integral with the worm wheel 7, is pressed against a bearing end face by a spring 39.
  • the spring 39 sits on the axis 40 for the worm wheel 7 with the pinion 8, which is fastened to the arm 35 and has a collar 41 with this bearing end face.
  • the preload of the spring 39 is set by a nut 42 so that the thrust exerted by the screw 6 first pivots the arm 35 until it abuts the stop 37 or 38, whereupon the push of the screw 6 then only the worm wheel 7 with the Pinion 8 and thus the ring gear 3 or 4 of the coil carrier 1 or 2 rotates.
  • the pre-tensioning of the spring 39 set in this way, the frictional resistance when the worm wheel 7 with the pinion 8 moves along the worm 6 is smaller than the rotational bearing friction of the worm wheel 7 with the pinion 8.
  • the free end of the arm 35 is guided in a guide 44.
  • the motor 5 is attached to an angle 45.
  • Two stops 46 and 47 limit the pivotability of the arm 21 with the cam carrier 27 and thus the mobility of the lever linkage 17 to 21 and 25.
  • the ribbon runs, as already mentioned, from the spool 11, which is seated on the non-driven (thereby freely rotatable) spool holder 2, the spool 10, which is seated on the driven spool holder 1.
  • the coils 10, 11 are held in a rotationally fixed manner on the coil carriers 1 and 2 by a pin 48 of the coil carrier engaging in a hole 49 in the coil flange.
  • Each coil carrier has a locking device (not shown) which holds the coil in the axial direction.
  • the usual drivers are sheet metal eyelets in the ribbon.
  • the ink ribbon is now wound onto the spool 11 sitting on the spool holder 2, from which it was previously unwound, and is pulled off the spool 10 sitting on the spool holder 1, onto which it is now practically completely wound.
  • the ribbon transport direction is reversed.
  • the reversing switch 32 When the engine is switched off, the reversing switch 32 remains in its respective position. Therefore, when the motor 5 is switched on again, it runs in the direction of rotation in which it was running before the motor was switched off. In this way it is ensured that the ribbon transport direction, even in the event of any number of interruptions in operation of any length, is only switched when the ribbon has run completely from one spool to the other.

Description

Die Erfindung bezieht sich auf eine Farbbandtransport- und -umschaltvorrichtung der im Oberbegriff des Patentanspruchs 1 angegebenen Gattung.The invention relates to an ink ribbon transport and switching device of the type specified in the preamble of claim 1.

Es ist eine Vorrichtung dieser Gattung vorgeschlagen worden (FR-A-2038682), bei der jeder Fühler durch ein Farbbandumlenkorgan an einem Ende einer längs verschiebbar gelagerten Stange gebildet ist, welche die Steuerkurve trägt. Das Farbband wird an jeweils einem der Umlenkorgane in einem stumpfen Winkel umgelenkt, während es in einem Abstand vom anderen Umlenkorgan läuft. Am Scheitel der Umlenkung ist eine Komponente der vom Antriebsmotor auf das Farbband ausgeübten Zugkraft bestrebt, die Stange zurückzustossen, wodurch die Umlenkung aufgehoben würde. Um das zu verhindern, ist die Stange mit einem Nocken mit schrägen Flanken ausgerüstet und ein von einer Feder belasteter Stössel vorgesehen, der jeweils an die der Umlenkung abgewandte Flanke drückt und damit dieser Kraftkomponente entgegenwirkt. Wenn das Farbband nicht weitertransportiert werden kann, weil es vollständig von einer der beiden Farbbandspulen abgezogen ist, übt der Antriebsmotor eine grössere Zugkraft auf das Farbband aus, wodurch auch die Kraftkomponente zunächst grösser wird. Dadurch soll die Stange gegen die Kraft, die der Stössel über die Nockenflanke ausübt, verschoben werden, so dass der Stössel über den Scheitel des Nockens läuft und danach an der anderen Nockenflanke angreift, um die Stange so weiter zu schieben, dass das Farbband am anderen Umlenkorgan umgelenkt wird. Dabei würde aber die Kraft, welche die Verschiebung bewirken soll, zunächst immer kleiner, weil der Umlenkungswinkel grösser und schliesslich ein nahezu gestreckter Winkel würde, und gleichzeitig würde die der Verschiebung entgegenwirkende, vom Stössel über die Nockenflanke ausgeübte Kraft zunehmen, weil die Feder zunehmend gespannt wird. D.h., dass die Stange durch eine während ihrer Verschiebung abnehmende Kraft gegen eine während ihrer Verschiebung zunehmende Kraft verschoben werden soll. Da das andere Umlenkorgan das Farbband frühestens in dem Zeitpunkt berühren darf, in dem der Stössel den Scheitel des Nockens überschreittet und weil die Verschiebungswegabschnitte der Stange beiderseits des Nockenscheitels gleich lang sein müssen, um jeweils dieselbe Umlenkung zu erzielen, ist es unvermeidlich, dass der Umlenkungswinkel bei maximal gespannter Feder ein nahezu gestreckter Winkel ist, wobei die genannte Kraftkomponente ausserordentlich klein ist, während die Feder ihre höchste Gegenkraft ausübt. Die Feder kann aber nicht schwach bemessen werden, denn sie muss dazu ausreichen, die Umlenkung des laufenden Farbbandes sicherzustellen, und auch die Flankensteilheit des Nokkens kann nicht klein bemessen werden, da sie nach dem Überschreiten des Nockenscheitels zum Weiterverschieben der Stange ausreichen muss, und weil ein auf eine Nockenflanke wirkender Stössel bei geringer Flankensteilheit nicht wirksam ist. Deshalb kann die Vorrichtung nach diesem Vorschlag kaum funktionieren, mindestens bestehen schwerwiegende, grundsätzliche Bedenken gegen ihre Brauchbarkeit.A device of this type has been proposed (FR-A-2038682), in which each sensor is formed by a ribbon deflector at one end of a longitudinally displaceably mounted rod which carries the control curve. The ink ribbon is deflected at an obtuse angle on each of the deflection elements, while it runs at a distance from the other deflection element. At the apex of the deflection, a component of the tensile force exerted by the drive motor on the ribbon strives to push the rod back, as a result of which the deflection would be canceled. To prevent this, the rod is equipped with a cam with oblique flanks and a plunger loaded by a spring is provided, which presses against the flank facing away from the deflection and thus counteracts this force component. If the ribbon cannot be transported because it is completely pulled off one of the two ribbon spools, the drive motor exerts a greater tensile force on the ribbon, which also increases the force component initially. This is intended to move the rod against the force that the plunger exerts on the cam flank, so that the plunger runs over the apex of the cam and then engages the other cam flank to push the rod so that the ribbon on the other Deflector is deflected. At the same time, however, the force that the displacement is supposed to cause would initially become smaller and smaller because the deflection angle would become larger and finally an almost elongated angle, and at the same time the force counteracting the displacement and exerted by the tappet via the cam flank would increase because the spring is increasingly tensioned becomes. This means that the rod is to be displaced by a force that decreases during its displacement against a force that increases during its displacement. Since the other deflecting element may touch the ink ribbon at the earliest when the tappet crosses the apex of the cam and because the displacement path sections of the rod on both sides of the cam apex must be of the same length in order to achieve the same deflection in each case, it is inevitable that the deflection angle with the spring under maximum tension is an almost elongated angle, the force component mentioned being extraordinarily small, while the spring exerts its greatest counterforce. However, the spring cannot be dimensioned weak, because it has to be sufficient to ensure the deflection of the running ink ribbon, and the slope of the cam can not be dimensioned small, because it has to be sufficient to move the rod further after the cam vertex is exceeded, and because a tappet acting on a cam flank is not effective with a low flank steepness. Therefore, the device can hardly function according to this proposal, at least there are serious, fundamental concerns about its usability.

Hier will die Erfindung Abhilfe schaffen. Die Erfindung, wie sie in den Ansprüchen gekennzeichnet ist, löst die Aufgabe, eine konstruktiv einfache und wenig aufwendige Farbbandtransport- und umschaltvorrichtung zu schaffen, bei der die Farbbandtransportrichtung zuverlässig sowohl jeweils beim Ablaufen eines Farbbandendes umgeschaltet als auch bei Erschütterungen oder nach ausschalten und Wiedereinschalten des Antriebsmotors unverändert beibehalten wird.The invention seeks to remedy this. The invention, as characterized in the claims, solves the problem of creating a structurally simple and inexpensive ribbon transport and switching device, in which the ribbon transport direction is reliably switched both when a ribbon end is running and in the event of vibrations or after switching off and on again Drive motor is unchanged.

Die durch die Erfindung erzielten Vorteile sind im wesentlichen darin zu sehen, dass nicht nur ein Teil einer teilweise gespeicherten Komponente, sondern die ganze am ablaufenden Teil des Farbbands wirksame, vom Antriebsmotor auf das Band übertragene Zugkraft unmittelbar zur Umschaltung der Farbbandtransportrichtung genutzt wird, wobei der Nocken der Steuerkurve leicht überwindbar und trotzdem so bemessen werden kann, dass die jeweilige Stellung des Reversierschalters zuverlässig auch bei starken Erschütterungen und Stössen beibehalten wird. Die Farbbandgabeln und die Steuerkurve sind an Hebelarmen angeordnet, so dass die Hebelübersetzung genutzt werden kann. Bei Ausführung mit einem von einer Schnecke angetriebenen, in einer Stellung mit einem Zahnkranz des einen und in der anderen mit einem Zahnkranz des anderen Farbbandspulenträgers kämmenden Ritzels wird durch erfindungsgemässe Bemessung der Reibungswiderstände ein Leerlaufen des Ritzels zwischen den Zahnkränzen verunmöglicht. Im übrigen wird die Befestigung des ablaufenden Farbbandteiles an der Farbbandspule beim Umschalten nicht beansprucht und der Antriebsmotor reversiert, ohne, wie bei der in der FR-A-208682 vorgeschlagenen Vorrichtung erforderlich, vorher an seiner Drehung gehindert zu werden. Insgesamt zeichnet sich die Farbbandtransport- und -umschaltvorrichtung durch Einfachheit und Zuverlässigkeit aus.The advantages achieved by the invention are essentially to be seen in the fact that not only a part of a partially stored component, but the entire tractive force acting on the running part of the ribbon, which is transmitted from the drive motor to the ribbon, is used directly for switching the ribbon transport direction, the Cams on the control cam can be easily overcome and still be dimensioned so that the respective position of the reversing switch is reliably maintained even in the event of strong shocks and impacts. The ribbon forks and the control cam are arranged on lever arms so that the lever ratio can be used. In the case of a design with a pinion which is driven by a worm and which meshes in one position with a ring gear of the one and in the other with a ring gear of the other ribbon reel carrier, the pinion between the ring gears is prevented from running empty by dimensioning the frictional resistances according to the invention. Moreover, the attachment of the running ribbon part to the ribbon reel is not claimed when switching over and the drive motor is reversed without being prevented from rotating beforehand, as is required in the device proposed in FR-A-208682. Overall, the ribbon transport and switching device is characterized by simplicity and reliability.

Es ist zwar eine Farbbandtransport- und -umschaltvorrichtung mit einem zum Umschalten der Farbbandtransportrichtung reversierbaren, elektrischen Antriebsmotor für den Farbbandtransport bekannt, die zwei, je durch einen Mitnehmer an einem Farbbandende betätigbare Farbbandgabeln hat (GB-A-1532012). Diese Vorrichtung ist jedoch gattungsmässig anderer Art, und sie löst die der Erfindung zugrunde liegende Aufgabe nicht. Bei ihr wird nämlich das Farbband nach jedem Aus- und Wiedereinschalten des Antriebsmotors immer in ein und derselben Richtung transportiert, was zu einer ungleichmässig über die Farbbandlänge verteilten Abnutzung und damit zu einer kürzeren Gebrauchsdauer des Farbbandes führt, weil ein teilweise abgenütztes Farbband auch dann nicht mehr verwendbar ist, wenn es noch durchaus brauchbare Bereiche aufweist. Demgegenüber wird das Farbband in der erfindungsgemässen Vorrichtung nach jedem Aus-und Wiedereinschalten in der Richtung transportiert, in der es vorher transportiert wurde, sodass es an seiner ganzen Länge gleichmässig benutzt wird. Die beiden Farbbandgabeln der bekannten Vorrichtung (GB-A-1532012) sind völlig unabhängig voneinander. Zum Reversieren des Antriebsmotors dient bei dieser Vorrichtung ein Reversierrelais mit Umschaltkontakten. Die eine Farbbandgabel betätigt einen Hebel, der auf einen Druckknopfschalter mit Arbeitskontakt wirkt, und die andere Farbbandgabel betätigt einen anderen Hebel, der auf einen anderen Druckknopfschalter mit Ruhekontakt wirkt. Der Arbeits- und der Ruhekontakt liegen in Reihe mit der Wicklung des Reversierrelais, das zusätzlich zu den Umschaltkontakten einen Haltekontakt hat, der parallel zum Arbeitskontakt geschaltet und bei stromdurchflossenen Wicklung geschlossen ist. Wenn bei stromloser Relaiswicklung die eine Farbbandgabel den Arbeitskontakt betätigt, wird der Stromkreis der Wicklung geschlossen, das Relais zieht an, wobei die Drehrichtung des Antriebsmotors und die Transportrichtung des Farbbandes umkehren. Danach wird das Relais durch den Haltekontakt unabhängig vom Zustand des Arbeitskontakts in der angezogenen Stellung gehalten. Das ist nötig, denn das Farbband wirkt nach Umkehr seiner Transportrichtung nicht mehr auf die zum Arbeitskontakt gehörende Farbbandgabel, so dass der Arbeitskontakt sich wieder öffnet, woraufhin die Wicklung wieder stromlos und die Farbbandtransportrichtung sofort wieder umgeschaltet würde, wenn der Haltekontakt nicht vorhanden wäre. Wenn bei stromdurchflossener Wicklung die andere Farbbandgabel den Ruhekontakt betätigt, wird der Stromkreis der Wicklung unterbrochen, das Relais fällt ab, wobei die Drehrichtung des Antriebsmotors und die Transportrichtung des Farbbandes wieder umkehren. Danach bleibt die Wicklung unabhängig vom Zustand des Ruhekontakts stromlos, weil der Haltekontakt nun offen ist. Das ist nötig, denn das Farbband wirkt nach Umkehr seiner Transportrichtung nicht mehr auf die zum Ruhekontakt gehörende Farbbandgabel, so dass der Ruhekontakt sich wieder schliesst, woraufhin der Stromkreis der Wicklung wieder geschlossen und die Farbbandtransportrichtung sofort wieder zurück umgeschaltet würde, wenn der Haltekontakt nicht offen wäre. Wenn die Vorrichtung ausgeschaltet worden ist, und wieder eingeschaltet wurde, ist die Wicklung des Reversierrelais stets stromlos, der Antriebsmotor läuft dann in der diesem Zustand des Reversierrelais entsprechenden Richtung, unabhängig davon, in welcher Richtung das Farbband vor dem Ausschalten der Vorrichtung transportiert worden war, womit die der Erfindung zugrunde liegende Aufgabe, wie erwähnt, nicht gelöst ist.A ribbon transport and switching device is known with an electric drive motor for ribbon transport which is reversible for switching the ribbon transport direction and which has two ribbon forks, each of which can be actuated by a driver at one end of the ribbon (GB-A-1532012). However, this device is of a different generic type and does not achieve the object on which the invention is based. With it, the ribbon is always transported in the same direction each time the drive motor is switched off and on again, which leads to wear that is distributed unevenly over the length of the ribbon and thus to a shorter service life of the ribbon, because a partially worn ribbon is then no longer can be used if it still has usable areas. In contrast, the ribbon is invented device according to the invention is transported after each switching off and on again in the direction in which it was previously transported, so that it is used uniformly over its entire length. The two ribbon forks of the known device (GB-A-1532012) are completely independent of one another. In this device, a reversing relay with changeover contacts is used to reverse the drive motor. One ribbon fork actuates a lever that acts on a push button switch with make contact, and the other ribbon fork actuates another lever that acts on another push button switch with normally closed contact. The make and break contacts are in series with the winding of the reversing relay, which has a hold contact in addition to the changeover contacts, which is connected in parallel with the make contact and is closed when the winding is energized. When the ribbon contact actuates the normally open relay winding, the winding circuit is closed and the relay picks up, reversing the direction of rotation of the drive motor and the transport direction of the ribbon. The relay is then held in the pulled position by the holding contact regardless of the state of the make contact. This is necessary because the ribbon no longer acts on the ribbon fork belonging to the working contact after reversing its transport direction, so that the working contact opens again, whereupon the winding is de-energized and the ribbon transport direction would be switched again immediately if the holding contact were not present. If the other ribbon fork actuates the normally closed contact with the current flowing through the winding, the circuit of the winding is interrupted, the relay drops out, the direction of rotation of the drive motor and the transport direction of the ribbon reversing again. The winding then remains de-energized regardless of the state of the normally closed contact because the holding contact is now open. This is necessary because the ribbon no longer acts on the ribbon fork belonging to the normally closed contact after reversing its transport direction, so that the normally closed contact closes again, whereupon the winding circuit is closed again and the ribbon transport direction would be switched back immediately if the holding contact was not open would. When the device has been switched off and has been switched on again, the winding of the reversing relay is always de-energized, the drive motor then runs in the direction corresponding to this state of the reversing relay, regardless of the direction in which the ribbon was transported before the device was switched off, whereby the object on which the invention is based, as mentioned, is not achieved.

Im folgenden wird die Erfindung anhand von lediglich einen Ausführungsweg darstellenden Zeichnung näher erläutert. Es zeigen:

  • Fig. 1 eine Draufsicht (Ansicht I in Fig. 2 und 3) auf eine Farbbandtransportvorrichtung,
  • Fig. 2 einen Schnitt nach der Linie 11-11 in Fig. 1 und
  • Fig. 3 einen Schnitt nach der Linie 111-111 in Fig. 1.
In the following, the invention is explained in more detail with reference to a drawing that shows only one embodiment. Show it:
  • 1 is a plan view (view I in Fig. 2 and 3) of an ink ribbon transport device,
  • Fig. 2 shows a section along the line 11-11 in Fig. 1 and
  • 3 shows a section along the line 111-111 in FIG. 1st

In der Zeichnung bezeichnen 1 und 2 die beiden Farbbandspulenträger. Diese weisen je einen Zahnkranz 3 bzw. 4 auf. Der Antriebsmotor 5 treibt über eine Schnecke 6 und ein Schneckenrad 7 ein Ritzel 8 an, das (in seiner ausgezogen dargestellten Stellung) mit dem Zahnkranz 3 kämmt, so dass der Farbbandspulenträger 1 in Pfeilrichtung rotiert. Dadurch wird das Farbband 9 auf die auf dem Farbbandspulenträger 1 sitzende Farbbandspule 10 aufgewickelt und dabei von der auf dem anderen Farbbandspulenträger 2 sitzenden Farbbandspule 11 abgezogen. Dabei läuft das Farbband 9 von der Spule 11 über eine Umlenkrolle 12 und durch eine Farbbandgabel 13 zu der Stelle, an der mittels des Farbbandes gedruckt wird und weiter durch eine Farbbandgabel 14 und eine Umlenkrolle 15 zur Spule 10 auf dem angetriebenen Spulenträger 1. Der für die Erfindung unwesentliche Farbbandverlauf zwischen den Gabeln 13 und 14 ist nicht dargestellt. Wenn das Farbband 9 bis auf einen kleinen Rest von der Spule 11 abgezogen ist, wird die Farbbandtransportrichtung, wie weiter unten erläutert, selbsttätig umgekehrt, indem die Drehrichtung des Antriebsmotors 5 umgekehrt wird, woraufhin das Ritzel 8 dann mit dem Zahnkranz 4 des Spulenträgers 2 kämmt, und das Farbband 9 von der Spule 10 abgezogen und auf die Spule 11, die auf dem nun angetriebenen Spulenträger 2 sitzt, aufgewickelt wird.In the drawing, 1 and 2 denote the two ribbon reel carriers. These each have a ring gear 3 or 4. The drive motor 5 drives a pinion 8 via a worm 6 and a worm wheel 7, which meshes with the ring gear 3 (in its drawn position) so that the ribbon reel carrier 1 rotates in the direction of the arrow. As a result, the ink ribbon 9 is wound onto the ink ribbon reel 10 sitting on the ink ribbon reel carrier 1 and is pulled off from the ink ribbon reel 11 sitting on the other ink ribbon reel carrier 2. The ribbon 9 runs from the spool 11 over a deflection roller 12 and through an ink ribbon fork 13 to the point at which printing is carried out by means of the ink ribbon and further through an ink ribbon fork 14 and a deflection roller 15 to the spool 10 on the driven bobbin 1 the ribbon run between the forks 13 and 14, which is not essential to the invention, is not shown. If the ink ribbon 9 has been removed from the spool 11 to a small extent, the ink ribbon transport direction is automatically reversed, as explained further below, by reversing the direction of rotation of the drive motor 5, whereupon the pinion 8 then meshes with the ring gear 4 of the spool carrier 2 , and the ink ribbon 9 is drawn off the spool 10 and wound onto the spool 11, which is seated on the now driven spool carrier 2.

Die Farbbandgabel 13 ist am freien Ende eines Armes 17 eines zweiarmigen Hebels 17, 18, die andere Farbbandgabel 14 ist am freien Ende eines Armes 19 eines dreiarmigen Hebels 19, 20, 21 befestigt. Der Hebel 17, 18 ist zwischen der Grundplatte 22 und dem Spulenträger 2 angeordnet und um einen Achszapfen 23 schwenkbar, auf dem auch der Spulenträger 2 drehbar gelagert ist. Auf entsprechende Weise ist der Hebel 19, 20, 21 um einen Achszapfen 24 schwenkbar, auf dem auch der Spulenträger 1 drehbar gelagert ist. Die Hebelarme 18 und 20 sind durch eine Schubstange 25 gelenkig miteinander verbunden.The ribbon fork 13 is attached to the free end of an arm 17 of a two-armed lever 17, 18, the other ribbon fork 14 is attached to the free end of an arm 19 of a three-armed lever 19, 20, 21. The lever 17, 18 is arranged between the base plate 22 and the coil carrier 2 and can be pivoted about an axle 23 on which the coil carrier 2 is also rotatably mounted. In a corresponding manner, the lever 19, 20, 21 can be pivoted about an axle 24 on which the coil carrier 1 is also rotatably mounted. The lever arms 18 and 20 are connected to one another in an articulated manner by a push rod 25.

Das freie Ende des Hebelarmes 21 bildet einen Kurventräger 27. Dessen Kurve hat zwei Abschnitte 28 und 29. Der Kurvenabschnitt 28 verläuft in einem kleineren und der Kurvenabschnitt 29 verläuft in einem grösseren Abstand vom Zahnkranz 3. Zwischen diesen beiden Abschnitten 28 und 29 hat der Kurventräger 27 einen Nocken 30. Auf der Kurve 28, 29, 30 läuft eine Rolle 31 (oder ein anderes geeignetes Organ, z. B. ein Nocken). Das Lager der Rolle 31 ist mit dem (gegen eine Federkraft zu betätigenden) Betätigungsorgan eines Reversier- oder Umkehrschalters 32 zum Umschalten der Drehrichtung des Motors 5 verbunden. In der dargestellten Stellung des Schalters 32 befindet sich die Rolle 31 auf dem Kurvenabschnitt 28. Dabei läuft der Motor 5, auf dessen Welle die Schnecke 7 sitzt, in der in Fig. 1 neben derSchnekke eingetragenen Drehrichtung. Wenn die Rolle 31 sich am Kurvenabschnitt 29 befindet, läuft der Motor 5 in der dazu entgegengesetzten Richtung. Durch den steilen Verbindungsabschnitt 33 zwischen den Kurvenabschnitten 28 und 29, der sich aus deren verschiedenen Abständen vom Zahnkranz 3 ergibt, und den Nocken 30 wird eine ungewollte Betätigung des Schalters 32, insbesondere bei Erschütterungen, verhindert.The free end of the lever arm 21 forms a curve carrier 27. Its curve has two sections 28 and 29. The curve section 28 runs in a smaller and the curve section 29 runs at a greater distance from the ring gear 3. The curve carrier has between these two sections 28 and 29 27 a cam 30. A roller 31 (or another suitable organ, for example a cam) runs on the curve 28, 29, 30. The bearing of the roller 31 is connected to the actuating member of a reversing or reversing switch 32 (to be actuated against a spring force) for switching the direction of rotation of the motor 5. In the illustrated position of the switch 32, the roller 31 is located on the curve section 28. The motor 5, on the shaft of which the worm 7 is seated, runs in the direction of rotation shown in FIG. 1 next to the screw. When the roller 31 is on the curve section 29, the motor 5 runs in the opposite direction. Due to the steep connecting section 33 between rule the curve sections 28 and 29, which results from their different distances from the ring gear 3, and the cams 30 an unwanted actuation of the switch 32, in particular in the event of vibrations, prevented.

Das Schneckenrad 7 und das Ritzel 8, die im dargestellten Beispiel zusammen aus einem Stück bestehen, sind am freien Ende eines Hebelarmes 35 gelagert, der um einen Zapfen 36 schwenkbar ist. Die Schwenkbarkeit ist durch zwei Anschläge 37 und 38 begrenzt. Wenn der Arm 35, wie dargestellt, am Anschlag 37 anliegt, kämmt das Ritzel 8 ordnungsgemäss mit dem Zahnkranz 3 (d.h. die Teilkreise beider berühren einander). Liegt der Arm 35 am anderen Anschlag 38, so kämmt das Ritzel 8' ordnungsgemäss mit dem anderen Zahnkranz 4. Im Bereiche der entsprechenden Stellung des Schneckenrades 7 greift das Gewinde der Schnecke 6 innerhalb zulässiger Toleranzen in die Zahnung des Schneckenrades 7. Um dies zu erleichtern, ist der Arm 35 möglichst lang ausgeführt.The worm wheel 7 and the pinion 8, which in the example shown consist of one piece, are mounted on the free end of a lever arm 35 which can be pivoted about a pin 36. The pivotability is limited by two stops 37 and 38. When the arm 35 abuts the stop 37 as shown, the pinion 8 properly meshes with the ring gear 3 (i.e. the pitch circles of both touch each other). If the arm 35 lies on the other stop 38, the pinion 8 'meshes properly with the other ring gear 4. In the area of the corresponding position of the worm wheel 7, the thread of the worm 6 engages in the toothing of the worm wheel 7 within permissible tolerances. To facilitate this , the arm 35 is made as long as possible.

Aus weiter unten aufgeführten Gründen muss der Schub, den die Schnecke 6 auf das Schneckenrad 7 und damit auf das freie Ende des Armes 35 ausübt, so gross sein, dass der Arm je nach Drehrichtung der Schnecke 6 von der dargestellten Stellung, in der er am Anschlag 37 anliegt, in seine andere, nicht dargestellte Stellung, in der er am Anschlag 38 anliegt, zuverlässig geschwenkt wird. Dasselbe gilt auch für die entgegengesetzte Schwenkung. Um dies sicherzustellen, ist das mit dem Schneckenrad 7 einstückige Ritzel 8 durch eine Feder 39 an eine Lagerstirnfläche gedrückt. Die Feder 39 sitzt auf der Achse 40 für das Schnekkenrad 7 mit dem Ritzel 8, die am Arm 35 befestigt ist und einen Bund 41 mit dieser Lagerstirnfläche hat. Die Vorspannung der Feder 39 ist durch eine Mutter 42 so eingestellt, dass der von der Schnekke 6 ausgeübte Schub zuerst den Arm 35 schwenkt bis dieser am Anschlag 37 bzw. 38 anliegt, woraufhin der Schub der Schnecke 6 dann nur noch das Schneckenrad 7 mit dem Ritzel 8 und damit den Zahnkranz 3 bzw. 4 des Spulenträgers 1 bzw. 2 dreht. Bei der so eingestellten Vorspannung der Feder 39 ist der Reibungswiderstand beim Bewegen des Schneckenrades 7 mit dem Ritzel 8 entlang der Schnecke 6 kleiner als die Drehlagerreibung des Schneckenrades 7 mit dem Ritzel 8.For reasons listed below, the thrust that the worm 6 exerts on the worm wheel 7 and thus on the free end of the arm 35 must be so great that the arm, depending on the direction of rotation of the worm 6, from the position shown in which it is on Stop 37 abuts, in its other position, not shown, in which it bears against stop 38, is reliably pivoted. The same applies to the opposite pivoting. To ensure this, the pinion 8, which is integral with the worm wheel 7, is pressed against a bearing end face by a spring 39. The spring 39 sits on the axis 40 for the worm wheel 7 with the pinion 8, which is fastened to the arm 35 and has a collar 41 with this bearing end face. The preload of the spring 39 is set by a nut 42 so that the thrust exerted by the screw 6 first pivots the arm 35 until it abuts the stop 37 or 38, whereupon the push of the screw 6 then only the worm wheel 7 with the Pinion 8 and thus the ring gear 3 or 4 of the coil carrier 1 or 2 rotates. With the pre-tensioning of the spring 39 set in this way, the frictional resistance when the worm wheel 7 with the pinion 8 moves along the worm 6 is smaller than the rotational bearing friction of the worm wheel 7 with the pinion 8.

Das freie Ende des Armes 35 ist in einer Führung 44 geführt. Der Motor 5 ist an einem Winkel 45 befestigt. Zwei Anschläge 46 und 47 begrenzen die Schwenkbarkeit des Armes 21 mit dem Kurventräger 27 und damit die Bewegbarkeit des Hebelgestänges 17 bis 21 und 25.The free end of the arm 35 is guided in a guide 44. The motor 5 is attached to an angle 45. Two stops 46 and 47 limit the pivotability of the arm 21 with the cam carrier 27 and thus the mobility of the lever linkage 17 to 21 and 25.

In der dargestellten Stellung der beweglichen Teile der Vorrichtung läuft das Farbband, wie bereits erwähnt, von der Spule 11, die auf dem nicht angetriebenen (dabei frei drehbaren) Spulenträger 2 sitzt, der Spule 10, die auf dem angetriebenen Spulenträger 1 sitzt. Die Spulen 10, 11 sind drehfest auf den Spulenträgern 1 und 2 gehalten, indem ein Zapfen 48 des Spulenträgers in ein Loch 49 des Spulenflansches greift. Jeder Spulenträger hat eine (nicht dargestellte) Rastvorrichtung, welche die Spule in axialer Richtung hält. Es ist ein Farbband zu verwenden, das nahe jedem Ende einen Mitnehmer hat, der die Farbbandaabe' 13 bzw. 14 nicht passieren kann, also breiter ist als der Gabelspalt. Übliche Mitnehmer sind Blech- ösen im Farbband.In the position shown of the moving parts of the device, the ribbon runs, as already mentioned, from the spool 11, which is seated on the non-driven (thereby freely rotatable) spool holder 2, the spool 10, which is seated on the driven spool holder 1. The coils 10, 11 are held in a rotationally fixed manner on the coil carriers 1 and 2 by a pin 48 of the coil carrier engaging in a hole 49 in the coil flange. Each coil carrier has a locking device (not shown) which holds the coil in the axial direction. Use a ribbon that has a driver near each end that cannot pass the ribbon hub '13 or 14, i.e. is wider than the fork gap. The usual drivers are sheet metal eyelets in the ribbon.

Wenn die Öse des Farbbandendes, das an der auf dem Spulenträger 2 sitzenden Spule 11 befestigt ist, an die Gabel 13 anstösst, nimmt sie diese und damit den Hebelarm 17 mit, der Arm 17 schwenkt in Fig. 1 im Uhrzeigersinn, der Arm 18 und die Schubstange 25 übertragen die Schwenkung auf den Hebel 19, 20, 21. Das Hebelgestänge 17 bis 21 und 25 kommt in die strichpunktiert gezeichnete Stellung in der die Gabeln mit 13' und 14' bezeichnet sind. Bei der Schwenkung des Hebelarmes 21 läuft die Rolle 31 vom Kurvenabschnitt 28 auf den Kurvenabschnitt 29, woraufhin der Reversierschalter 32 die Drehrichtung des Motors 5 umkehrt. Dabei schiebt die Schnecke 6 das Schneckenrad 7 mit dem Ritzel 8 und damit das freie Ende des Armes 35 in Fig. 1 nach rechts, bis der Arm 35 am Anschlag 38 anstösst, wobei das Ritzel 8' in den Zahnkranz 4 greift und den Spulenträger 2 entgegengesetzt zur Pfeilrichtung dreht. Dabei hält der über das Ritzel 8' auf das freie Ende des Armes 35 ausgeübte Schub den Arm 35 in dieser Stellung.When the eyelet of the ribbon end, which is attached to the spool 11 seated on the spool 11, abuts the fork 13, it takes this and thus the lever arm 17 with it, the arm 17 pivots clockwise in FIG. 1, the arm 18 and the push rod 25 transmit the pivoting to the lever 19, 20, 21. The lever linkage 17 to 21 and 25 comes to the position shown in broken lines in which the forks are designated 13 'and 14'. When the lever arm 21 is pivoted, the roller 31 runs from the curve section 28 to the curve section 29, whereupon the reversing switch 32 reverses the direction of rotation of the motor 5. The worm 6 pushes the worm wheel 7 with the pinion 8 and thus the free end of the arm 35 in FIG. 1 to the right until the arm 35 abuts the stop 38, the pinion 8 ′ engaging in the ring gear 4 and the coil carrier 2 turns opposite to the direction of the arrow. The thrust exerted on the free end of the arm 35 via the pinion 8 'keeps the arm 35 in this position.

Das Farbband wird nun auf die auf dem Spulenträger 2 sitzende Spule 11, von der es vorher abgewickelt wurde, aufgewickelt und von der auf dem Spulenträger 1 sitzenden Spule 10, auf die es nun praktisch vollständig aufgewickelt ist, abgezogen. Die Farbbandtransportrichtung ist umgekehrt.The ink ribbon is now wound onto the spool 11 sitting on the spool holder 2, from which it was previously unwound, and is pulled off the spool 10 sitting on the spool holder 1, onto which it is now practically completely wound. The ribbon transport direction is reversed.

Wenn das Farbband nahezu vollständig von der auf dem Spulenträger 1 sitzenden Spule 10 abgezogen und auf die auf dem Spulenträger 2 sitzende Spule 11 aufgewickelt ist, nimmt die Öse an dem Farbbandende, das an der auf dem Spulenträger 1 sitzenden Spule 10 befestigt ist, die Gabel 14 mit. Dabei wird in entsprechender Weise die Farbbandtransportrichtung wieder umgekehrt. Die beweglichen Teile der Vorrichtung sind dann wieder in der ausgezogen dargestellten Stellung.When the ribbon is almost completely removed from the spool 10 sitting on the spool holder 1 and wound onto the spool 11 sitting on the spool holder 2, the eyelet on the end of the ribbon attached to the spool 10 sitting on the spool holder 1 takes the fork 14 with. The ribbon transport direction is reversed in a corresponding manner. The moving parts of the device are then again in the position shown in solid lines.

Wenn der Motor ausgeschaltet wird, bleibt der Reversierschalter 32 in seiner jeweiligen Stellung. Deshalb läuft der Motor 5 beim Wieder-Einschalten wieder in der Drehrichtung, in der er vor dem Ausschalten lief. Auf diese Weise ist sichergestellt, dass die Farbbandtransportrichtung auch bei beliebig vielen und beliebig langen Betriebsunterbrechungen immer erst dann umgeschaltet wird, wenn das Farbband ganz von einer Spule zur anderen gelaufen ist.When the engine is switched off, the reversing switch 32 remains in its respective position. Therefore, when the motor 5 is switched on again, it runs in the direction of rotation in which it was running before the motor was switched off. In this way it is ensured that the ribbon transport direction, even in the event of any number of interruptions in operation of any length, is only switched when the ribbon has run completely from one spool to the other.

Ein bei Erschütterungen auf das Hebelgestänge 17 bis 21 und 25 wirkendes Drehmoment kann den Reversierschalter 32 nicht verstellen, weil seine beiden Schalterstellungen Raststellen beiderseits des steilen Kurvenabschnitts 33 und des Nockens 30 sind. Dabei ist zu berücksichtigen, dass der Motor 5 in bezug auf den Radius des beim Betätigen des Reversierschalters 28 praktisch vollständig auf die angetriebene Farbbandspule aufgewikkelten Farbbandes durch das Getriebe 6, 7, und 1 bzw. 2 sehr stark untersetzt ist, so dass der schräge Kurvenabschnitt 3 und die Flanken des Nokkens 30 ziemlich steil und die Feder, deren Rückstellkraft zur Schalterbetätigung überwunden werder muss, ziemlich steif ausgeführt werden kann, was zu sicheren Raststellungen führt.A torque acting on the lever linkages 17 to 21 and 25 when shaken cannot adjust the reversing switch 32 because its two switch positions are locking points on both sides of the steep curve section 33 and the cam 30. It should be taken into account that the motor 5 practically completely winds up on the driven ribbon spool with respect to the radius of the actuation of the reversing switch 28 celt ribbon is very strongly reduced by the gear 6, 7, and 1 and 2, so that the oblique curve section 3 and the flanks of the cam 30 can be quite steep and the spring, the restoring force of which must be overcome to actuate the switch, can be made quite stiff , which leads to safe resting positions.

Wenn bei Erschütterungen Beschleunigungskräfte auf das Schneckenrad 7 mit dem Ritzel 8 wirken und den Arm 35 verstellen, wird dieser durch den von der Schnecke 6 ausgeübten Schub stets wieder in die Stellung zurückbewegt, die dem jeweiligen Betriebszustand entspricht, und zwar auf dieselbe Weise, auf die er vorher - wie beschrieben - aus seiner anderen Stellung in diese Stellung bewegt wurde.If, in the event of vibrations, acceleration forces act on the worm wheel 7 with the pinion 8 and adjust the arm 35, this is always moved back into the position corresponding to the respective operating state by the thrust exerted by the worm 6, in the same way, in that previously - as described - it was moved from this other position into this position.

Claims (7)

1. An ink-ribbon feed and reversing device having an electric driving motor (5) for the ink-ribbon feed which is reversible for reversing the ink-ribbon feed direction, a reversing switch (32) and two sensors which are jointly movable into a first position (13, 14) and into a second position (13', 14') and each of which, in the case of change of the two ink-ribbon feed directions, responds at the end of the ink-ribbon run-off whereby the sensors (13,14) and a control cam (28,29) for the reversing switch (32) which has cam portions (28, 29) each associated with one direction of rotation of the same are moved into the respective positions, characterised in that the sensors are two ink-ribbon forks (13, 14) which are each actuatable by an entrainment means at one end of the ribbon and which are coupled together by a thrust rod (25), and in that the control cam (28, 29) is formed on a lever arm (21) positively swung with the ink-ribbon forks (13, 14) and has a lobe (30) between the cam portions (28, 29).
2. A device according to claim 1, in which one for the ink-ribbon forks (14) is arranged on one arm (19) and the cam (28-30), or the member (31) which is movable on it, is arranged on a further arm (21) of a lever (19/21
3. A device according to claim 2, in which each ink-ribbon fork (13, 14) is arranged on one arm (17, 19) of a lever which has a further arm (18, 20), and these further arms (18, 20) are coupled together by a thrust rod (25).
4. A device according to one of claims 1 to 3, in which the lever or each of the levers (1/21 or 17/18 respectively, 19/20/21) is swingable about an axis (23, 24) which is coaxial to one of the ink-ribbon spool carriers (1, 2).
5. A device according to one of claims 1 to 4, in which the ink-ribbon spool carriers (1, 2) each have a toothed rim (3, 4), and a worm wheel (7), which is connected coaxially securely to a driving pinion (8) and into which a stationary worm (6) driven by the driving motor (5) engages, is movable along the worm (6) into a position in which the pinion (8) meshes with the toothed rim (3) of the one ink-ribbon spool carrier (1) and into a position in which the pinion (8) meshes with the toothed rim (4) of the other ink-ribbon spool carrier (2), and the frictional resistance of the movement of the pinion (8) with the worm wheel (7) from one of these two positions into the other is less than the frictional resistance upon the rotation of the worm wheel with the pinion (7, 8), so that the worm (6), upon reversal of its direction of rotation, first of all moves the worm wheel with the pinion (7, 8) into the other respective position and only then rotates in this position.
6. A device according to claim 5, in which, for the achievement of the frictional resistance upon its rotation, the worm wheel with the pinion (7, 8) is pressed against an end surface (41) of its bearing by a spring (39).
7. A device according to claim 6, in which the tension of the spring (39) is adjustable.
EP80101248A 1979-04-20 1980-03-12 Ink ribbon transporting and reversing device Expired EP0017753B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3717/79 1979-04-20
CH371779 1979-04-20

Publications (3)

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EP0017753A2 EP0017753A2 (en) 1980-10-29
EP0017753A3 EP0017753A3 (en) 1981-05-27
EP0017753B1 true EP0017753B1 (en) 1984-06-20

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EP80101248A Expired EP0017753B1 (en) 1979-04-20 1980-03-12 Ink ribbon transporting and reversing device

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US (1) US4294553A (en)
EP (1) EP0017753B1 (en)
JP (1) JPS55140586A (en)
DE (1) DE3068283D1 (en)

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JPS5811635A (en) * 1981-07-13 1983-01-22 東芝テック株式会社 Label printer
JPS5811636A (en) * 1981-07-13 1983-01-22 東芝テック株式会社 Label printer
JPS6046285A (en) * 1983-08-24 1985-03-13 Alps Electric Co Ltd Thermal printer
NL8800650A (en) * 1988-03-16 1989-10-16 Jan Kelders INK CASSETTE.
US4981378A (en) * 1988-12-29 1991-01-01 Kraemer Wilfried Apparatus for printing a strip
JP2544485B2 (en) * 1989-07-14 1996-10-16 株式会社テック Printer
GB2383974B (en) * 2002-01-15 2006-01-18 Markem Tech Ltd Improvements in or relating to printing apparatus
US20070020012A1 (en) * 2005-07-22 2007-01-25 Feng-Yi Tai Ribbon module structure of label printer
US20080101838A1 (en) * 2005-07-22 2008-05-01 Feng-Yi Tai Ribbon module structure of label printer

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FR1206391A (en) * 1958-08-18 1960-02-09 Device for the continuous reading of magnetic tapes, recorded on double tracks, by alternating and permanent unwinding
BE703962A (en) * 1966-09-20 1968-02-01
FR2038682A5 (en) * 1969-03-21 1971-01-08 Radiotechnique Compelec
US3677176A (en) * 1970-09-10 1972-07-18 Data Printer Corp Ribbon control apparatus for high speed printers
US3811547A (en) * 1972-08-31 1974-05-21 Ibm Cyclically rotatable eccentric pivot for ribbon reverse lever
JPS5121905B2 (en) * 1973-02-26 1976-07-06
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GB1414426A (en) * 1973-05-29 1975-11-19 Itt Creed Ink ribbon arrangements for teleprinters and the like
DE2337191C3 (en) * 1973-07-21 1978-11-09 Triumph Werke Nuernberg Ag, 8500 Nuernberg Transport device for carbon or plastic ribbons for power-driven typewriters and similar machines
GB1532012A (en) * 1976-01-23 1978-11-15 Extel Corp Teleprinter apparatus
DE2736040A1 (en) * 1977-08-10 1979-02-22 Siemens Ag Transport direction changing mechanism for ink ribbon - has toothed rod extendable within pivot region of toothed planet wheel

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EP0017753A2 (en) 1980-10-29
US4294553A (en) 1981-10-13
EP0017753A3 (en) 1981-05-27
DE3068283D1 (en) 1984-07-26
JPS55140586A (en) 1980-11-04

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