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EP0391505A1 - Print head carriage driving device for a printer, especially for a matrix printer - Google Patents

Print head carriage driving device for a printer, especially for a matrix printer

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Publication number
EP0391505A1
EP0391505A1 EP90250024A EP90250024A EP0391505A1 EP 0391505 A1 EP0391505 A1 EP 0391505A1 EP 90250024 A EP90250024 A EP 90250024A EP 90250024 A EP90250024 A EP 90250024A EP 0391505 A1 EP0391505 A1 EP 0391505A1
Authority
EP
European Patent Office
Prior art keywords
roller
housing part
drive
deflection roller
printer
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.)
Granted
Application number
EP90250024A
Other languages
German (de)
French (fr)
Other versions
EP0391505B1 (en
Inventor
Ulrich Buschmann
Günter Gomoll
Wolfgang Hauslaib
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.)
Vodafone GmbH
Original Assignee
Mannesmann 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 Mannesmann AG filed Critical Mannesmann AG
Priority to AT90250024T priority Critical patent/ATE103242T1/en
Publication of EP0391505A1 publication Critical patent/EP0391505A1/en
Application granted granted Critical
Publication of EP0391505B1 publication Critical patent/EP0391505B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/005—Cable or belt constructions for driving print, type or paper-carriages, e.g. attachment, tensioning 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
    • 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

Definitions

  • the invention relates to a device for driving a printhead carriage for a printer, in particular for a matrix printer, with a drive motor, further with a traction roller and an opposite deflection roller over which a traction means attached to both ends of the printhead carriage runs, the deflection roller in one Carrier housing is mounted, which rests against a spring-loaded clamping wedge for the purpose of tensioning the traction means.
  • Such devices in which a rope or a tensioning strap, e.g. a toothed belt is stretched by means of the tensioning device described and thus somewhat stretched, used to guide away a carriage carrying the printing elements or a printing head in front of the recording medium, which lies on a pressure abutment of the printer.
  • Path intervals are determined via a slotted disc in which the pressure elements are actuated in a predetermined manner.
  • the rotary movement of a drive motor for the traction means is transmitted synchronously to the rotary movement of the slotted disc, which is scanned with the aid of a light beam, so that path-dependent pulses are generated, to which the respective positions of the slide are known.
  • Another system uses a stepper motor drive.
  • tensioning devices for a rope-shaped transmission member of a drive device in typewriters or similar office machines is known for example from DE-OS 33 19 671.
  • the known tensioning device leads to the mentioned effects of the tension means tension. It is assumed that an exact setting of the printing unit carriage is made possible both in the forward and in the return.
  • the present invention is based on the object of making the presence of such a tensioning device for the traction means usable as a drive for further assemblies required in a printer.
  • a drive force can be derived from the deflecting roller which can be driven by the traction means in reversing rotary movements in one direction of rotation by means of a clutch which is dependent on the direction of rotation and can be engaged and disengaged for a connected ribbon drive shaft.
  • the direct combination of a tensioning device with a derived ribbon drive saves a separate drive motor for the ribbon and also an additional pull rope.
  • the ribbon drive can be derived from the carrier housing via a clutch that can be disengaged and engaged, so that the ribbon is always pulled through in the same direction.
  • Such a device is therefore particularly simple and manageable in terms of production or assembly technology. It is particularly advantageous here that the ink ribbon is advanced in steps in a certain ratio to the length of the feed movement of the print head carriage.
  • the carrier housing consists of a lower housing part and a connectable upper housing part, that the carrier housing forms pivot bearings for the deflecting roller and for an ink ribbon drive shaft, that the deflecting roller carries a coaxial first gear that on the carrier housing at a distance from the deflecting roller second gear is rotatably mounted on the ribbon drive shaft and that between the coaxial first gear of the deflection roller and the second gear of the ribbon drive shaft is a spring-loaded intermediate gear that can be pushed back and forth in a longitudinal or curved guide.
  • the back and forth sliding intermediate gear represents the clutch.
  • the spring force enables the clutch to be engaged and disengaged with the same force. It is also particularly advantageous that the carrier housing forms a structural unit that can be assembled outside of the printer.
  • the coupling force mentioned can now be generated in such a way that a one-armed spring is attached to the lower housing part, which bears against the circumference of the intermediate gear which can be pushed back and forth under pretension.
  • the force ratios therefore remain constant with the length of the lever arm being unchanged.
  • the one-armed spring is also molded onto the lower part of the housing made of plasticizable plastic. A special attachment of the spring is therefore unnecessary.
  • Another further development of the invention consists in that spacers are provided between the lower housing part and the upper housing part and that the upper housing part and the lower housing part can be connected by means of resilient clamp arms cast on one side. After inserting the deflection roller, the gearwheel together with the drive shaft for the ribbon drive and the intermediate gearwheel, these three components are axially fixed after joining the lower housing part and the upper housing part and do not require any special measures in this regard.
  • a further embodiment of the invention consists in that the carrier housing rests on a strip-shaped shoulder of the tensioning wedge which runs perpendicular to the tensioning direction by means of a projecting first projection, that the tensioning wedge has a first abutment against which the first, longer leg of a leg spring rests and that the second, shorter leg of the leg spring rests against a second abutment fixed to the printer frame.
  • the deflecting roller has a tooth-like bead running parallel to the axial direction on its support surface for the traction means at least for a quarter of the circumference.
  • Such an embodiment allows the deflection roller to be produced together with the coaxial gearwheel including flanged wheels, so that a separate attachment of flanged wheels is no longer necessary as previously.
  • the deflection roller for the traction means is rotatably supported by means of a roller bearing which is embedded in a vibration-damping, concentrically inserted in the deflection roller, elastic bearing shell.
  • the device for the reciprocating drive of a print head carriage 1 is used for matrix printers, thermal transfer printers, type wheel printers and all other printers which are equipped with a print head carriage carrying a print head which can be set in the reciprocating movements by means of a traction means.
  • a drive motor 2 carries on its shaft a drive pulley 3, by means of which a traction means 4 is fastened with its ends 4a and 4b to the print head carriage 1 and which is guided over a deflection roller 5 arranged approximately at a distance from the carriage path.
  • the traction means 4 is e.g. from a pull rope, a flat belt or a toothed belt.
  • the deflection roller 5 is rotated in the directions of rotation 7a and 7b in accordance with the printhead carriage 1 which is moved back and forth in the directions 6a and 6b.
  • the deflection roller 5 is also rotatably supported in a carrier housing 8.
  • the deflection roller 5 also only transmits its driving force in one of the directions of rotation 7a or 7b.
  • This intermittent drive force arises from a clutch 9 of an ink ribbon drive shaft 10, which will be described in more detail, for an ink ribbon cassette which is not shown but is known.
  • Such a ribbon cassette receives the end of the ribbon drive shaft 10 in a corresponding ring gear, specifically when the ribbon cassette is inserted into the printer.
  • the carrier housing 8 is produced from a lower housing part 11 and a housing upper part 12 which can be connected to it. On a printer frame 13 there are clips 14, under which projections 15 of the lower housing part 11 can be inserted.
  • the carrier housing 8 forms on the lower housing part 11 and on the upper housing part 12 pivot bearing 16.
  • a pivot bearing 16 of the lower housing part 11 is the Ribbon drive shaft 10 and in another rotary bearing 16 of the upper housing part 12, the guide roller 5 is rotatably mounted.
  • a coaxial first gear 17 is also integrally formed on the deflection roller 5.
  • a second gear 18 is fixed axially on the carrier housing 8 and forms part of the ribbon drive shaft 10 in the exemplary embodiment. Between the coaxial first gear 17, the deflection roller 5 and the second gear 18 of the ribbon drive shaft 10, an intermediate gear 19 is mounted.
  • the intermediate gear 19 forms the clutch 9 mentioned, in that it can be pushed back and forth in a longitudinal or curved guide 20 with its journal 21, against the force of a single-arm spring 22.
  • the movements in the directions of movement 23a and 23b produce the effects of Coupling 9.
  • the longitudinal or curved guide 20 for the bearing journal 21 is provided in the lower housing part 11 and opposite in the upper housing part 12.
  • the single arm spring 22 is part of the lower housing part 11 (Fig. 1), i.e. the spring 22 is integrally molded with a projection 22a on the lower housing part 11 made of plasticizable plastic. This spring 22 bears against the circumference 24 of the intermediate gear 19 which can be pushed back and forth under pretension.
  • the carrier housing 8 from the lower housing part 11 and the upper housing part 12 is held together by clamp arms 25 (FIGS. 2 and 4), the upper housing part 12 and the lower housing part 11 being kept at a distance by spacers 26 (FIG. 3).
  • spacers 26 are injection-molded several times either on the lower housing part 11 or on the upper housing part 12.
  • the tensioning device within the overall device consists of a tensioning wedge 27 which engages under a projection 29 which extends obliquely to the tensioning direction 28 and is fastened to the printer frame 13.
  • the carrier housing 8 has on the lower housing part 11 a protruding projection 30 which rests on a strip-shaped shoulder 31 of the clamping wedge 27 which runs perpendicular to the clamping direction 28.
  • the clamping wedge 27 has a first abutment 32 against which the first longer leg 33a of a leg spring 33 bears.
  • the second shorter leg 33b bears against a second abutment 34 which is fixed on the printer frame 13.
  • the deflection roller 5 (FIG. 5) has on its bearing surface 35 for the traction means 4 a tooth-like bead 37 per quarter of the circumference 36. 5 two such beads 37 are drawn in two successive quarters lying closer together. The beads 37 run parallel to the direction of the axis 38.
  • the deflection roller 5 for the traction means 4 is also rotatably supported by means of a roller bearing 39 which is embedded in a vibration-damping, elastic bearing shell 40 inserted concentrically into the deflection roller 5.
  • the intermediate gear 19 therefore represents the clutch 9 mentioned in the exemplary embodiment.

Landscapes

  • Impression-Transfer Materials And Handling Thereof (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)

Abstract

In a printer, a drive motor, a drive roller arranged on the shaft of the motor, a reversal roller in spaced relation to the drive roller, and an elongated drive belt trained about the drive and reversal rollers form a tensioning device, the belt being fastened at its ends to a print-head carriage for selectively displacing the carriage in the forward and reverse directions along and relative to a printable substrate support roller or base. The reversal roller is carried in a carrier housing which movably and cooperatively engages a spring-loaded tensioning wedge for maintaining the elongated drive belt in a predetermined tensioned or stretched relation. In order to avoid the need for a separate or specialized drive motor and an additional drive belt for advancing an inked printing ribbon, the drive force for the inked-ribbon drive shaft is derived from the reversal roller which, in the normal operation of the printer, is rotatable in opposite directions for selectively positioning the print-head carriage along the printable substrate support. For this purpose, a clutch member is interposed between the reversal roller and a gearwheel associated with the inked-ribbon drive shaft, the clutch member being longitudinally movable into coupled and uncoupled relations with the inked-ribbon gearwheel as a function of the direction of rotation of the reversal roller.

Description

Die Erfindung betrifft eine Einrichtung für den Antrieb eines Druckkopfschlittens für einen Drucker, insbesondere für einen Matrixdrucker, mit einem Antriebsmotor, ferner mit einer Zugmittelrolle und einer gegenüberliegenden Umlenkrolle, über die ein mit beiden Enden an den Druckkopfschlitten befestigtes Zugmittel verläuft, wobei die Umlenkrolle in einem Trägergehäuse gelagert ist, das zwecks Spannens des Zugmittels gegen einen gefederten Spannkeil anliegt.The invention relates to a device for driving a printhead carriage for a printer, in particular for a matrix printer, with a drive motor, further with a traction roller and an opposite deflection roller over which a traction means attached to both ends of the printhead carriage runs, the deflection roller in one Carrier housing is mounted, which rests against a spring-loaded clamping wedge for the purpose of tensioning the traction means.

Derartige Einrichtungen, bei denen ein Seil oder ein Spannriemen, z.B. ein Zahnriemen mittels der beschriebenen Spannvorrichtung gestreckt und damit etwas gedehnt wird, dienen der weggenauen Führung eines die Druckelemente bzw. einen Druckkopf tragenden Schlittens vor dem Aufzeichnungsträger, der auf einem Druckwiderlager des Druckers aufliegt. Hierbei werden über eine Schlitzscheibe Wegintervalle ermittelt, in denen vorherbestimmt die Druckelemente betätigt werden. Die Drehbewegung eines Antriebsmotors für das Zugmittel wird hier synchron auf die Drehbewegung der Schlitzscheibe übertragen, die mit Hilfe eines Lichtstrahls abgetastet wird, so daß wegabhängige Impulse entstehen, zu denen zugehörige Stellungen des Schlittens jeweils bekannt sind. Ein anderes System bedient sich eines Schrittmotorantriebs.Such devices in which a rope or a tensioning strap, e.g. a toothed belt is stretched by means of the tensioning device described and thus somewhat stretched, used to guide away a carriage carrying the printing elements or a printing head in front of the recording medium, which lies on a pressure abutment of the printer. Path intervals are determined via a slotted disc in which the pressure elements are actuated in a predetermined manner. The rotary movement of a drive motor for the traction means is transmitted synchronously to the rotary movement of the slotted disc, which is scanned with the aid of a light beam, so that path-dependent pulses are generated, to which the respective positions of the slide are known. Another system uses a stepper motor drive.

Derartige Spannvorrichtungen für ein seilförmiges Übertragungsglied einer Antriebsvorrichtung in Schreib- oder ähnlichen Büromaschinen ist z.B. aus der DE-OS 33 19 671 bekannt. Die bekannte Spannvorrichtung führt zu den erwähnten Wirkungen der Zugmittelspannung. Hierbei wird davon ausgegangen, daß eine exakte Einstellung des Druckwerkswagens sowohl beim Vor- als auch beim Rücklauf ermöglicht wird.Such tensioning devices for a rope-shaped transmission member of a drive device in typewriters or similar office machines is known for example from DE-OS 33 19 671. The known tensioning device leads to the mentioned effects of the tension means tension. It is assumed that an exact setting of the printing unit carriage is made possible both in the forward and in the return.

Der vorliegenden Erfindung ist die Aufgabe zugrundegelegt, das Vorhandensein einer derartigen Spannvorrichtung für das Zugmittel als Antrieb für weitere in einem Drucker notwendige Baugruppen nutzbar zu machen.The present invention is based on the object of making the presence of such a tensioning device for the traction means usable as a drive for further assemblies required in a printer.

Die gestellte Aufgabe wird erfindungsgemäß nunmehr dadurch gelöst, daß von der über das Zugmittel in reversierenden Drehbewegungen antreibbaren Umlenkrolle jeweils in einer Drehrichtung eine Antriebskraft mittels einer drehrichtungsabhängig aus- und einrückbaren Kupplung für eine angeschlossene Farbbandantriebswelle ableitbar ist. Die unmittelbare Kombination einer Spannvorrichtung mit abgeleitetem Farbbandantrieb erspart einen separaten Antriebsmotor für das Farbband und auch noch ein zusätzliches Zugseil. Die Ableitung des Farbbandantriebs von dem Trägergehäuse kann über eine aus- und einrückbare Kupplung erfolgen, um das Farbband immer in derselben Richtung durchzuziehen. Eine solche Einrichtung ist daher besonders einfach und fertigungs- bzw. montagetechnisch überschaubar. Besonders vorteilhaft ist hierbei, daß das Farbband in Schritten in einem bestimmten Verhältnis zur Lange der Vorschubbewegung des Druckkopfschlittens vorgezogen wird.The object is now achieved according to the invention in that a drive force can be derived from the deflecting roller which can be driven by the traction means in reversing rotary movements in one direction of rotation by means of a clutch which is dependent on the direction of rotation and can be engaged and disengaged for a connected ribbon drive shaft. The direct combination of a tensioning device with a derived ribbon drive saves a separate drive motor for the ribbon and also an additional pull rope. The ribbon drive can be derived from the carrier housing via a clutch that can be disengaged and engaged, so that the ribbon is always pulled through in the same direction. Such a device is therefore particularly simple and manageable in terms of production or assembly technology. It is particularly advantageous here that the ink ribbon is advanced in steps in a certain ratio to the length of the feed movement of the print head carriage.

Eine Ausgestaltung der Erfindung besteht darin, daß das Trägergehäuse aus einem Gehäuseunterteil und einem verbindbaren Gehäuseoberteil besteht, daß das Trägergehäuse Drehlager für die Umlenkrolle und für eine Farbbandantriebswelle bildet, daß die Umlenkrolle ein gleichachsiges erstes Zahnrad trägt, daß an dem Trägergehäuse im Abstand zur Umlenkrolle ein zweites Zahnrad auf der Farbbandantriebswelle drehgelagert ist und daß zwischen dem gleichachsigen ersten Zahnrad der Umlenkrolle und dem zweiten Zahnrad der Farbbandantriebswelle ein unter Federkraft stehendes, in einer Längs- oder Bogenführung hin- und herverschiebbares Zwischenzahnrad drehgelagert ist. Hierbei stellt das hin- und herverschiebbare Zwischenzahnrad die Kupplung dar.An embodiment of the invention is that the carrier housing consists of a lower housing part and a connectable upper housing part, that the carrier housing forms pivot bearings for the deflecting roller and for an ink ribbon drive shaft, that the deflecting roller carries a coaxial first gear that on the carrier housing at a distance from the deflecting roller second gear is rotatably mounted on the ribbon drive shaft and that between the coaxial first gear of the deflection roller and the second gear of the ribbon drive shaft is a spring-loaded intermediate gear that can be pushed back and forth in a longitudinal or curved guide. Here, the back and forth sliding intermediate gear represents the clutch.

Durch die Federkraft ist ein mit gleichbleibender Kraft stattfindendes Ein- bzw. Auskuppeln möglich. Besonders vorteilhaft ist außerdem, daß das Trägergehäuse eine außerhalb des Druckers fertigmontierbare Baueinheit bildet.The spring force enables the clutch to be engaged and disengaged with the same force. It is also particularly advantageous that the carrier housing forms a structural unit that can be assembled outside of the printer.

Die erwähnte Kupplungskraft kann nunmehr derart erzeugt werden, daß an dem Gehäuseunterteil eine einarmige Feder befestigt ist, die gegen den Umfang des hin- und herverschiebbaren Zwischenzahnrades unter Vorspannung anliegt. Die Kraftverhältnisse bleiben daher bei unveränderlicher Länge des Hebelarmes konstant.The coupling force mentioned can now be generated in such a way that a one-armed spring is attached to the lower housing part, which bears against the circumference of the intermediate gear which can be pushed back and forth under pretension. The force ratios therefore remain constant with the length of the lever arm being unchanged.

In Verbesserung der Erfindung ist vorgesehen, daß die einarmige Feder an den aus plastifizierbarem Kunststoff bestehenden Gehäuseunterteil mit angespritzt ist. Eine besondere Befestigung der Feder erübrigt sich daher.In an improvement of the invention it is provided that the one-armed spring is also molded onto the lower part of the housing made of plasticizable plastic. A special attachment of the spring is therefore unnecessary.

Eine andere Weiterentwicklung der Erfindung besteht darin, daß zwischen Gehäuseunterteil und Gehäuseoberteil Abstandshalter vorgesehen sind und daß das Gehäuseoberteil und das Gehäuseunterteil mittels einseitig angegossener federnder Klammerarme verbindbar sind. Nach Einfügen der Umlenkrolle, des Zahnrades zusammen mit der Antriebswelle für den Farbbandantrieb und des Zwischenzahnrades sind diese drei Bauteile nach Zusammenfügen des Gehäuseunterteils und des Gehäuseoberteils axial festgelegt und bedürfen diesbezüglich keiner besonderen Maßnahmen.Another further development of the invention consists in that spacers are provided between the lower housing part and the upper housing part and that the upper housing part and the lower housing part can be connected by means of resilient clamp arms cast on one side. After inserting the deflection roller, the gearwheel together with the drive shaft for the ribbon drive and the intermediate gearwheel, these three components are axially fixed after joining the lower housing part and the upper housing part and do not require any special measures in this regard.

Eine weitere Ausgestaltung der Erfindung besteht darin, daß das Trägergehäuse mittels eines überstehenden ersten Vorsprungs auf einem leistenförmigen, zur Spannrichtung senkrecht verlaufenden Absatz des Spannkeils aufliegt, daß der Spannkeil ein erstes Widerlager aufweist, gegen das der erste, längere Schenkel einer Schenkelfeder anliegt und daß der zweite, kürzere Schenkel der Schenkelfeder gegen ein am Druckergestell festes, zweites Widerlager anliegt. Eine solche Festlegung des Trägergehäuses gestattet, eine kürzeste Spannstellung der Umlenkrolle und der Zugmittelrolle einzustellen.A further embodiment of the invention consists in that the carrier housing rests on a strip-shaped shoulder of the tensioning wedge which runs perpendicular to the tensioning direction by means of a projecting first projection, that the tensioning wedge has a first abutment against which the first, longer leg of a leg spring rests and that the second, shorter leg of the leg spring rests against a second abutment fixed to the printer frame. Such a fixing of the carrier housing allows the shortest tensioning position of the deflection roller and the traction roller to be set.

Weiterhin wird vorgeschlagen, daß die Umlenkrolle an ihrer Auflagefläche für das Zugmittel zumindest pro einem Viertel des Umfangs einen zahnähnlichen parallel zur axialen Richtung verlaufenden Wulst aufweist. Eine solche Ausgestaltung erlaubt, die Umlenkrolle zusammen mit dem gleichachsigen Zahnrad einschließlich Bordscheiben herzustellen, so daß ein gesondertes Anbringen von Bordscheiben wie bisher nicht mehr erforderlich ist.Furthermore, it is proposed that the deflecting roller has a tooth-like bead running parallel to the axial direction on its support surface for the traction means at least for a quarter of the circumference. Such an embodiment allows the deflection roller to be produced together with the coaxial gearwheel including flanged wheels, so that a separate attachment of flanged wheels is no longer necessary as previously.

Ein sicherer Betrieb der Baueinheit des Trägergehäuses wird außerdem dadurch ermöglicht, daß die Umlenkrolle für das Zugmittel mittels eines Wälzlagers drehgelagert ist, das in einer schwingungsdämpfenden, konzentrisch in die Umlenkrolle eingesetzten, elastischen Lagerschale eingebettet ist.Safe operation of the structural unit of the carrier housing is also made possible in that the deflection roller for the traction means is rotatably supported by means of a roller bearing which is embedded in a vibration-damping, concentrically inserted in the deflection roller, elastic bearing shell.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Es zeigen:

  • Fig. 1 eine Draufsicht auf die Anordnung von Antriebsmotor mit Zugmittelrolle, Umlenkrolle, Druckkopfschlitten und Trägergehäuse,
  • Fig. 2 einen senkrechten Querschnitt A - B gemäß Fig. 1,
  • Fig. 3 einen senkrechten Querschnitt C - D gemäß Fig. 1,
  • Fig. 4 einen senkrechten Querschnitt E - F gemäß Fig. 1,
  • Fig. 5 den Umriß der Umlenkrolle von oben betrachtet und
  • Fig. 6 das System des Zwischenzahnrads und der an ihm wirkenden Kräfte.
An embodiment of the invention is shown in the drawing and will be described in more detail below. Show it:
  • 1 is a plan view of the arrangement of the drive motor with traction roller, deflection roller, printhead carriage and carrier housing,
  • 2 shows a vertical cross section A - B according to FIG. 1,
  • 3 shows a vertical cross section C - D according to FIG. 1,
  • 4 shows a vertical cross section E - F according to FIG. 1,
  • Fig. 5 viewed the outline of the pulley from above and
  • Fig. 6 shows the system of the intermediate gear and the forces acting on it.

Die Einrichtung für den hin- und hergehenden Antrieb eines Druckkopfschlittens 1 wird für Matrixdrucker, Thermotransferdrucker, Typenraddrucker und alle anderen Drucker angewendet, die mit einem einen Druckkopf tragenden Druckkopfschlitten ausgerüstet sind, der mittels eines Zugmittels in die hin- und hergehenden Bewegungen versetzbar ist. Ein Antriebsmotor 2 trägt auf seiner Welle eine Antriebsriemenscheibe 3, über das ein Zugmittel 4 mit seinen Enden 4a und 4b an dem Druckkopfschlitten 1 befestigt ist und das über eine etwa im Abstand des Schlittenweges angeordnete Umlenkrolle 5 geführt ist. Das Zugmittel 4 besteht z.B. aus einem Zugseil, einem Flachriemen oder einem Zahnriemen.The device for the reciprocating drive of a print head carriage 1 is used for matrix printers, thermal transfer printers, type wheel printers and all other printers which are equipped with a print head carriage carrying a print head which can be set in the reciprocating movements by means of a traction means. A drive motor 2 carries on its shaft a drive pulley 3, by means of which a traction means 4 is fastened with its ends 4a and 4b to the print head carriage 1 and which is guided over a deflection roller 5 arranged approximately at a distance from the carriage path. The traction means 4 is e.g. from a pull rope, a flat belt or a toothed belt.

Die Umlenkrolle 5 wird entsprechend des in den Richtungen 6a und 6b hin- und herbewegten Druckkopfschlittens 1 in den Drehrichtungen 7a und 7b hin- und hergedreht. Die Umlenkrolle 5 ist außerdem in einem Trägergehäuse 8 drehgelagert. Die Umlenkrolle 5 gibt außerdem ihre Antriebskraft jedoch nur in einer der Drehrichtungen 7a oder 7b weiter. Diese intermittierende Antriebskraft entsteht durch eine noch näher zu beschreibende Kupplung 9 einer Farbbandantriebswelle 10 für eine nicht näher dargestellte, jedoch bekannte Farbbandkassette. Eine solche Farbbandkassette nimmt das Ende der Farbbandantriebswelle 10 in einem entsprechenden Hohlrad auf, und zwar beim Einsetzen der Farbbandkassette in den Drucker.The deflection roller 5 is rotated in the directions of rotation 7a and 7b in accordance with the printhead carriage 1 which is moved back and forth in the directions 6a and 6b. The deflection roller 5 is also rotatably supported in a carrier housing 8. The deflection roller 5 also only transmits its driving force in one of the directions of rotation 7a or 7b. This intermittent drive force arises from a clutch 9 of an ink ribbon drive shaft 10, which will be described in more detail, for an ink ribbon cassette which is not shown but is known. Such a ribbon cassette receives the end of the ribbon drive shaft 10 in a corresponding ring gear, specifically when the ribbon cassette is inserted into the printer.

Das Trägergehäuse 8 ist aus einem Gehäuseunterteil 11 und einem mit diesem verbindbaren Gehäuseoberteil 12 hergestellt. An einem Druckergestell 13 befinden sich Klammern 14, unter die Vorsprünge 15 des Gehäuseunterteils 11 einschiebbar sind.The carrier housing 8 is produced from a lower housing part 11 and a housing upper part 12 which can be connected to it. On a printer frame 13 there are clips 14, under which projections 15 of the lower housing part 11 can be inserted.

Das Trägergehäuse 8 bildet am Gehäuseunterteil 11 und am Gehäuseoberteil 12 Drehlager 16. In einem Drehlager 16 des Gehäuseunterteils 11 ist die Farbbandantriebswelle 10 und in einem anderen Drehlager 16 des Gehäuseoberteils 12 ist die Umlenkrolle 5 drehgelagert. An der Umlenkrolle 5 ist außerdem ein gleichachsiges, erstes Zahnrad 17 einstückig angeformt.The carrier housing 8 forms on the lower housing part 11 and on the upper housing part 12 pivot bearing 16. In a pivot bearing 16 of the lower housing part 11 is the Ribbon drive shaft 10 and in another rotary bearing 16 of the upper housing part 12, the guide roller 5 is rotatably mounted. A coaxial first gear 17 is also integrally formed on the deflection roller 5.

Ein zweites Zahnrad 18 ist axial am Trägergehäuse 8 festgelegt und bildet im Ausführungsbeispiel einen Teil der Farbbandantriebswelle 10. Zwischen dem gleichachsigen, ersten Zahnrad 17, der Umlenkrolle 5 und dem zweiten Zahnrad 18 der Farbbandantriebswelle 10 ist ein Zwischenzahnrad 19 gelagert. Das Zwischenzahnrad 19 bildet die erwähnte Kupplung 9, indem es in einer Längs- oder Bogenführung 20 mit seinen Lagerzapfen 21 hin- und herverschiebbar ist, und zwar entgegen der Kraft einer einarmigen Feder 22. Die Bewegungen in den Bewegungsrichtungen 23a und 23b erzeugen die Wirkungen der Kupplung 9.A second gear 18 is fixed axially on the carrier housing 8 and forms part of the ribbon drive shaft 10 in the exemplary embodiment. Between the coaxial first gear 17, the deflection roller 5 and the second gear 18 of the ribbon drive shaft 10, an intermediate gear 19 is mounted. The intermediate gear 19 forms the clutch 9 mentioned, in that it can be pushed back and forth in a longitudinal or curved guide 20 with its journal 21, against the force of a single-arm spring 22. The movements in the directions of movement 23a and 23b produce the effects of Coupling 9.

Die Längs- oder Bogenführung 20 für die Lagerzapfen 21 ist in dem Gehäuseunterteil 11 und gegenüberliegend in dem Gehäuseoberteil 12 vorgesehen.The longitudinal or curved guide 20 for the bearing journal 21 is provided in the lower housing part 11 and opposite in the upper housing part 12.

Die einarmige Feder 22 ist Teil des Gehäuseunterteils 11 (Fig. 1), d.h. die Feder 22 ist mit einem Ansatz 22a fest an dem Gehäuseunterteil 11 aus plastifizierbarem Kunststoff mit angespritzt. Diese Feder 22 liegt gegen den Umfang 24 des hin- und herverschiebbaren Zwischenzahnrades 19 unter Vorspannung an.The single arm spring 22 is part of the lower housing part 11 (Fig. 1), i.e. the spring 22 is integrally molded with a projection 22a on the lower housing part 11 made of plasticizable plastic. This spring 22 bears against the circumference 24 of the intermediate gear 19 which can be pushed back and forth under pretension.

Das Trägergehäuse 8 aus dem Gehäuseunterteil 11 und dem Gehäuseoberteil 12 wird durch Klammerarme 25 zusammengehalten (Fig. 2 und 4), wobei das Gehäuseoberteil 12 und das Gehäuseunterteil 11 durch Abstandshalter 26 (Fig. 3) auf Distanz gehalten werden. Solche Abstandshalter 26 sind entweder am Gehäuseunterteil 11 oder an dem Gehäuseoberteil 12 mehrfach mit angespritzt.The carrier housing 8 from the lower housing part 11 and the upper housing part 12 is held together by clamp arms 25 (FIGS. 2 and 4), the upper housing part 12 and the lower housing part 11 being kept at a distance by spacers 26 (FIG. 3). Such spacers 26 are injection-molded several times either on the lower housing part 11 or on the upper housing part 12.

Die Spannvorrichtung innerhalb der Gesamteinrichtung besteht aus einem Spannkeil 27, der einen schräg zur Spannrichtung 28 verlaufenden, am Druckergestell 13 befestigten Vorsprung 29 untergreift. Das Trägergehäuse 8 weist am Gehäuseunterteil 11 einen überstehenden Vorsprung 30 auf, der auf einem leistenförmigen, zur Spannrichtung 28 senkrecht verlaufenden Absatz 31 des Spannkeils 27 aufliegt. Der Spannkeil 27 besitzt ein erstes Widerlager 32, gegen das der erste längere Schenkel 33a einer Schenkelfeder 33 anliegt. Der zweite kürzere Schenkel 33b liegt gegen ein am Druckergestell 13 festes zweites Widerlager 34 an.The tensioning device within the overall device consists of a tensioning wedge 27 which engages under a projection 29 which extends obliquely to the tensioning direction 28 and is fastened to the printer frame 13. The carrier housing 8 has on the lower housing part 11 a protruding projection 30 which rests on a strip-shaped shoulder 31 of the clamping wedge 27 which runs perpendicular to the clamping direction 28. The clamping wedge 27 has a first abutment 32 against which the first longer leg 33a of a leg spring 33 bears. The second shorter leg 33b bears against a second abutment 34 which is fixed on the printer frame 13.

Die Umlenkrolle 5 (Fig. 5) weist an ihrer Auflagefläche 35 für das Zugmittel 4 pro einem Viertel des Umfangs 36 jeweils einen zahnähnlichen Wulst 37 auf. In Fig. 5 sind jeweils zwei solcher Wülste 37 in zwei aufeinanderfolgenden Vierteln näher zusammenliegend gezeichnet. Die Wülste 37 verlaufen parallel zur Richtung der Achse 38. Die Umlenkrolle 5 für das Zugmittel 4 ist außerdem mittels eines Wälzlagers 39 drehgelagert, das in einer schwingungsdämpfenden, konzentrisch in die Umlenkrolle 5 eingesetzten, elastischen Lagerschale 40 eingebettet ist.The deflection roller 5 (FIG. 5) has on its bearing surface 35 for the traction means 4 a tooth-like bead 37 per quarter of the circumference 36. 5 two such beads 37 are drawn in two successive quarters lying closer together. The beads 37 run parallel to the direction of the axis 38. The deflection roller 5 for the traction means 4 is also rotatably supported by means of a roller bearing 39 which is embedded in a vibration-damping, elastic bearing shell 40 inserted concentrically into the deflection roller 5.

Bei Drehrichtung 7b der Umlenkrolle 5 wird aufgrund der Kraft der Feder 22 eine Umfangskraft Fu (Fig. 6) durch die zwischen der Feder 22 und dem Umfang 24 des Zwischenzahnrades 19 herrschende Reibungskraft Fr erzeugt, so daß das Zwischenzahnrad 19 (Fig. 1) in die Bewegungsrichtung 23b gedrängt wird.In the direction of rotation 7b of the deflection roller 5, a circumferential force Fu (FIG. 6) is generated by the friction force Fr between the spring 22 and the circumference 24 of the intermediate gear 19 due to the force of the spring 22, so that the intermediate gear 19 (FIG. 1) in the direction of movement 23b is pushed.

Bei Drehrichtungsumkehr in die Drehrichtung 7a der Umlenkrolle 5 drückt die entgegengesetzt wirkende Umfangskraft Fu das Zwischenzahnrad 19 in Richtung 23a aus dem Eingriff mit dem Zahnrad 18. Das Zwischenzahnrad 19 stellt daher im Ausführungsbeispiel die erwähnte Kupplung 9 dar.When the direction of rotation is reversed in the direction of rotation 7a of the deflection roller 5, the opposing peripheral force Fu pushes the intermediate gear 19 in the direction 23a out of engagement with the gear 18. The intermediate gear 19 therefore represents the clutch 9 mentioned in the exemplary embodiment.

Claims (8)

1. Einrichtung für den Antrieb eines Druckkopfschlittens für einen Drucker, insbesondere für einen Matrixdrucker, mit einem Antriebsmotor, ferner mit einer Zugmittelrolle und einer gegenüberliegenden Umlenkrolle, über die ein mit beiden Enden an den Druckkopfschlitten befestigtes Zugmittel verläuft, wobei die Umlenkrolle in einem Tragergehäuse gelagert ist, das zwecks Spannens des Zugmittels gegen einen gefederten Spannkeil anliegt,
dadurch gekennzeichnet,
daß von der über das Zugmittel (4) in reversierenden Drehbewegungen antreibbaren Umlenkrolle (5) jeweils in einer Drehrichtung (7a oder 7b) eine Antriebskraft mittels einer drehrichtungsabhängig aus- und einrückbaren Kupplung (9) für eine angeschlossene Farbbandantriebswelle (10) ableitbar ist.1. Device for driving a print head carriage for a printer, in particular for a matrix printer, with a drive motor, further with a traction roller and an opposite deflection roller over which a traction means attached to both ends of the print head carriage runs, the deflection roller being mounted in a carrier housing which lies against a spring-loaded clamping wedge for the purpose of tensioning the traction device,
characterized,
that a drive force can be derived from the deflection roller (5), which can be driven by the traction means (4) in reversing rotary movements, in one direction of rotation (7a or 7b) by means of a clutch (9) which can be disengaged and engaged for a connected ribbon drive shaft (10). 2. Einrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß das Trägergehäuse (8) aus einem Gehäuseunterteil (11) und einem verbindbaren Gehäuseoberteil (12) besteht, daß das Trägergehäuse (8) Drehlager (16) für die Umlenkrolle (5) und für eine Farbbandantriebswelle (10) bildet, daß die Umlenkrolle (5) ein gleichachsiges erstes Zahnrad (17) trägt, daß an dem Trägergehäuse (8) im Abstand zur Umlenkrolle (5) ein zweites Zahnrad (18) auf der Farbbandantriebswelle (10) drehgelagert ist und daß zwischen dem gleichachsigen ersten Zahnrad (17) der Umlenkrolle (5) und dem zweiten Zahnrad (18) der Farbbandantriebswelle (10) ein unter Federkraft stehendes, in einer Längs- oder Bogenführung (20) hin- und herverschiebbares Zwischenzahnrad (19) drehgelagert ist.2. Device according to claim 1,
characterized,
that the carrier housing (8) consists of a lower housing part (11) and a connectable upper housing part (12), that the carrier housing (8) forms rotary bearings (16) for the deflection roller (5) and for an ink ribbon drive shaft (10) that the deflection roller ( 5) carries a coaxial first gear (17) that on the carrier housing (8) at a distance from the deflection roller (5) a second gear (18) on the ribbon drive shaft (10) is rotatably mounted and that between the coaxial first gear (17) Deflection roller (5) and the second gear (18) of the ribbon drive shaft (10) is an intermediate gear (19) which is under spring force and can be pushed back and forth in a longitudinal or curved guide (20). 3. Einrichtung nach Anspruch 2,
dadurch gekennzeichnet,
daß an dem Gehäuseunterteil (11) eine einarmige Feder (22) befestigt ist, die gegen den Umfang (24) des hin- und herverschiebbaren Zwischenzahnrades (19) unter Vorspannung anliegt.3. Device according to claim 2,
characterized,
that a one-armed spring (22) is attached to the lower housing part (11), which bears against the circumference (24) of the reciprocating intermediate gear (19) under prestress. 4. Einrichtung nach Anspruch 3,
dadurch gekennzeichnet,
daß die einarmige Feder (22) an den aus plastifizierbarem Kunststoff bestehenden Gehäuseunterteil (11) mit angespritzt ist.4. Device according to claim 3,
characterized,
that the one-armed spring (22) is molded onto the lower plastic housing part (11). 5. Einrichtung nach einem oder mehreren der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
daß zwischen Gehäuseunterteil (11) und Gehäuseoberteil (12) Abstandshalter (26) vorgesehen sind und daß das Gehäuseoberteil (12) und das Gehäuseunterteil (11) mittels einseitig angegossener federnder Klammerarme (25) verbindbar sind.5. Device according to one or more of claims 1 to 4,
characterized,
that spacers (26) are provided between the lower housing part (11) and upper housing part (12) and that the upper housing part (12) and the lower housing part (11) can be connected by means of resilient clamp arms (25) cast on one side. 6. Einrichtung nach einem oder mehreren der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
daß das Trägergehäuse (8) mittels eines überstehenden ersten Vorsprungs (30) auf einem leistenförmigen, zur Spannrichtung (28) senkrecht verlaufenden Absatz (31) des Spannkeils (27) aufliegt, daß der Spannkeil (27) ein erstes Widerlager (32) aufweist, gegen das der erste, längere Schenkel (33a) einer Schenkelfeder (33) anliegt und daß der zweite, kürzere Schenkel (33b) der Schenkelfeder (33) gegen ein am Druckergestell (13) festes, zweites Widerlager (34) anliegt.6. Device according to one or more of claims 1 to 5,
characterized,
that the carrier housing (8) rests by means of a protruding first projection (30) on a strip-shaped shoulder (31) of the clamping wedge (27) that runs perpendicular to the clamping direction (28), that the clamping wedge (27) has a first abutment (32), against which the first, longer leg (33a) of a leg spring (33) rests and that the second, shorter leg (33b) of the leg spring (33) rests against a second abutment (34) fixed to the printer frame (13). 7. Einrichtung nach einem oder mehreren der Ansprüche 1 bis 6,
dadurch gekennzeichnet,
daß die Umlenkrolle (5) an ihrer Auflagefläche (35) für das Zugmittel (4) zumindest pro einem Viertel des Umfangs (36) einen zahnähnlichen parallel zur axialen Richtung verlaufenden Wulst (37) aufweist.7. Device according to one or more of claims 1 to 6,
characterized,
that the deflecting roller (5) has on its bearing surface (35) for the traction means (4) at least per quarter of the circumference (36) a tooth-like bead (37) running parallel to the axial direction. 8. Einrichtung nach einem oder mehreren der Ansprüche 1 bis 7,
dadurch gekennzeichnet,
daß die Umlenkrolle (5) für das Zugmittel (4) mittels eines Wälzlagers (39) drehgelagert ist, das in einer schwingungsdämpfenden, konzentrisch in die Umlenkrolle (5) eingesetzten, elastischen Lagerschale (40) eingebettet ist.8. Device according to one or more of claims 1 to 7,
characterized,
that the deflection roller (5) for the traction means (4) is rotatably supported by means of a roller bearing (39) which is embedded in a vibration-damping, concentrically inserted in the deflection roller (5), elastic bearing shell (40).
EP90250024A 1989-04-07 1990-01-31 Print head carriage driving device for a printer, especially for a matrix printer Expired - Lifetime EP0391505B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90250024T ATE103242T1 (en) 1989-04-07 1990-01-31 DEVICE FOR DRIVING A PRINT HEAD CARRIAGE FOR A PRINTER, IN PARTICULAR FOR A MATRIX PRINTER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3911887A DE3911887A1 (en) 1989-04-07 1989-04-07 DEVICE FOR DRIVING A PRINT HEAD SLIDE FOR A PRINTER, IN PARTICULAR FOR A MATRIX PRINTER
DE3911887 1989-04-07

Publications (2)

Publication Number Publication Date
EP0391505A1 true EP0391505A1 (en) 1990-10-10
EP0391505B1 EP0391505B1 (en) 1994-03-23

Family

ID=6378441

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90250024A Expired - Lifetime EP0391505B1 (en) 1989-04-07 1990-01-31 Print head carriage driving device for a printer, especially for a matrix printer

Country Status (5)

Country Link
US (1) US5133614A (en)
EP (1) EP0391505B1 (en)
JP (1) JPH02286377A (en)
AT (1) ATE103242T1 (en)
DE (2) DE3911887A1 (en)

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JP2919650B2 (en) * 1991-06-28 1999-07-12 キヤノン株式会社 Carriage moving device and serial recording device

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Also Published As

Publication number Publication date
US5133614A (en) 1992-07-28
JPH02286377A (en) 1990-11-26
DE59005045D1 (en) 1994-04-28
DE3911887C2 (en) 1991-03-28
DE3911887A1 (en) 1990-10-11
EP0391505B1 (en) 1994-03-23
ATE103242T1 (en) 1994-04-15

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