EP0099973B1 - Drawing frame for a spinning machine - Google Patents

Drawing frame for a spinning machine Download PDF

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Publication number
EP0099973B1
EP0099973B1 EP83105255A EP83105255A EP0099973B1 EP 0099973 B1 EP0099973 B1 EP 0099973B1 EP 83105255 A EP83105255 A EP 83105255A EP 83105255 A EP83105255 A EP 83105255A EP 0099973 B1 EP0099973 B1 EP 0099973B1
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EP
European Patent Office
Prior art keywords
apron
roll
roller
rollers
guide
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Expired
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EP83105255A
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German (de)
French (fr)
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EP0099973A1 (en
Inventor
Arthur Würmli
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Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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Publication of EP0099973A1 publication Critical patent/EP0099973A1/en
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/60—Arrangements maintaining drafting elements free of fibre accumulations
    • D01H5/64—Rollers or aprons with cleaning surfaces

Definitions

  • the present invention relates to a drafting system for a spinning machine with a forward and a main drafting zone, with an inlet roller pair comprising an upper and a lower roller, with an outlet roller pair comprising an upper and a lower roller and with an upper and a driven by an apron roller pair a lower apron, wherein the pre-draft zone extends between the pair of infeed rollers and the nip line formed by the apron rollers pressed against the top and bottom apron rollers, and the main draft zone extends between this nip line and the pair of outlet rollers, and wherein the bottom apron extends under the draft zone and the lower infeed roller .
  • the invention is particularly concerned with the cleaning of such drafting systems.
  • a cleaning device is already known from DE-A-2 217 314, in which a cleaning and stopping effect takes place by means of cleaning straps provided specifically for cleaning, by friction and movement thereof on the faster rotating rollers and the top straps.
  • DE-C-908 590 also discloses an apron drafting system in which the lower apron extends to below the pair of inlet cylinders. There is no contact of the lower apron with the lower of these cylinders.
  • cleaning of the lower apron and the lower inlet cylinder is to be obtained. It is characterized in that in the operation of the drafting system one strand of the lower apron is in grazing contact with this lower inlet roller, and that the other strand of the lower apron sags loosely.
  • the lower inlet cylinder and the lower apron are cleaned by wiping off their surfaces, it not being necessary to provide any cleaning means.
  • the drafting system is therefore extremely simple. Continuous cleaning of the roller significantly reduces the risk of winding formation. Adhesion of fibers is prevented at an early stage. Because the top and bottom straps are used to guide the fibers during the drafting process in the main drafting zone, and because the straps are guided over deflection points during operation, it is inherently necessary to produce the straps from a material that is resistant to friction. Insofar as there is only slight contact of the lower apron with the lower infeed roller, the service life of the apron is practically hardly changed by the cleaning arrangement.
  • a surprising result is a significant simplification of threading, because the beginning of the sliver, which is moved through by the pair of inlet rollers, no longer has to be guided by hand to the point of entry of the clamping area formed by the straps.
  • the fuse comes to rest on the lower strap by itself, is thus carried along by it and reaches the area of mutual contact of the moving straps in order to be transported further. Since the fibers produced during cleaning come to rest on the lower apron, there is a further advantage of the invention in that the stripped fibers are reinserted into the sliver to be drawn in the main drafting zone, i. H. there is a recycling of the fibers resulting from the cleaning.
  • the invention will now be explained in more detail using exemplary embodiments and the figure of the drawing.
  • the latter shows a pair of inlet rollers formed by an upper and a lower inlet roller 11 and 12, respectively, through which the sliver 13 and the incoming roving entering through the condenser 28 are detected on the inlet side of the drafting system and transported from right to left as shown in the figure.
  • an upper and lower apron roller 14 and 15 forming a pair of rollers are provided.
  • This pair of rollers is used to drive the upper apron 16 and the lower apron 17.
  • the apron 16 is guided around a deflection point 18.
  • a bridge 19 and a deflection rail 20 are provided for guiding the apron 17.
  • Following the two straps 16, 17 there is a pair of outlet rollers formed by an upper and a lower outlet roller 23 and 24, respectively.
  • An apron guide 21 is attached to a bearing saddle 22.
  • the latter is primarily used to support the apron lower roller 15. It can be adjusted in the direction perpendicular to the axis of rotation of the roller 15. This setting is used to remove the entry point for the sliver fibers formed by the converging straps 16, 17 from the outlet rollers 23, 24, i. H. to adjust the length of the main draft zone of the different types of such fibers.
  • the bearing saddle 22 and the further bearing saddle 25 for the inlet roller 12 are carried by a carrier 26.
  • the location of maximum pressure formed by the rollers 14 and 15 pressed against each other is located between the straps 16, 17 along a line parallel to the axes of rotation of the rollers 14, 15, the so-called clamping line 27.
  • the area between the inlet roller pair 11, 12 and the clamping line 27 is the default zone.
  • the area between the clamping line 27 and the outlet roller pair 23, 24 is the main draft zone.
  • the rollers 11, 12, 14, 15 and 23, 24 rotate in the direction of rotation indicated by the arrows.
  • the peripheral speed of the inlet rollers 11, 12 and Strap rollers 14, 15 are relatively small, and that of the feed rollers 11, 12 is still somewhat smaller than that of the strap rollers 14, 15 and thus also the speed of the straps 16, 17.
  • the peripheral speed of the rollers 23, 24 is, however, much greater than that of the rollers 14, 15, so that the actual warping of the fuse takes place in the main drafting region.
  • the rollers 11, 12 and 14, 15 and the deflection rail 20 are arranged in such a way that the lower apron 17 is in contact with the lower infeed roller 12 during operation of the drafting system, i. H. grazes on the roller 12. It can be seen that at the point of contact the surface of the roller 12 and the strap 17 move in opposite directions. Fibers adhering to the roller 12 are stripped from the straps 17 and remain on the latter, i. H. they are taken away by it. They then return to the fiber sliver 12, with which they are mixed during their further processing.
  • a second embodiment of the invention is shown in the figure. According to this, a corresponding mutual arrangement of the bridge 19 and the outlet roller 24 additionally contacts the lower apron 17 with the lower outlet roller 24. In this case too, the surface of the roller 24 moves in the opposite direction to the movement of the apron 17. In this way, cleaning of the lower outlet roller 24 is also achieved.
  • the downwardly extending part of the bridge 19 is provided with a corresponding extension 29, as is indicated by dashed lines.
  • the desired strength of the contact with the roller 24 can be chosen as desired.
  • an apron guide 21 is provided for guiding the apron 17 laterally.
  • the use of a loose strap 17 causes less friction and thus an increase in the life of the same.
  • the strap guide 21 prevents the loose strap from migrating and thus ensures that the drafting system functions properly.
  • a very precise guidance for the straps 17 is obtained if the guidance is as close as possible to the entry point to the clamping area of the straps 16, 17.
  • Darpit is a further advantageous embodiment of the invention when there is a loose bottom strap 17 in that the strap guide 21 is attached to the bearing saddle 22.
  • the guide 21 is also moved during the horizontal adjustment of the rollers 14, 15 to different types of fibers, in particular fiber lengths, by displacing the bearing plate 22. A once optimal distance of the roller 14, 15 from the apron guide 21 is thus always maintained when adapting to different types of fibers.

Description

Die vorliegende Erfindung bezieht sich auf ein Streckwerk für eine Spinnmaschine mit einer Vor- und einer Hauptverzugszone, mit einem eine obere und eine untere Walze umfassenden Einlaufwalzenpaar, mit einem eine obere und eine untere Walze umfassenden Auslaufwalzenpaar und mit einem durch ein Riemchenwalzenpaar angetriebenen Ober- und einem Unterriemchen, wobei sich die Vorverzugszone zwischen dem Einlaufwalzenpaar und der durch die an das Ober- und Unterriemchen angepreßten Riemchenwalzen gebildeten Klemmlinie, und die Hauptverzugszone sich zwischen dieser Klemmlinie und dem Auslaufwalzenpaar erstreckt, und wobei sich das Unterriemchen unter der Verzugszone und der unteren Einlaufwalze erstreckt.The present invention relates to a drafting system for a spinning machine with a forward and a main drafting zone, with an inlet roller pair comprising an upper and a lower roller, with an outlet roller pair comprising an upper and a lower roller and with an upper and a driven by an apron roller pair a lower apron, wherein the pre-draft zone extends between the pair of infeed rollers and the nip line formed by the apron rollers pressed against the top and bottom apron rollers, and the main draft zone extends between this nip line and the pair of outlet rollers, and wherein the bottom apron extends under the draft zone and the lower infeed roller .

Die Erfindung befaßt sich insbesondere mit der Reinigung solcher Streckwerke. Durch die DE-A-2 217 314 ist bereits eine Putzvorrichtung bekannt, bei welcher durch eigens zum Putzen vorgesehenen Putzriemchen durch Reibung und Bewegung derselben auf den schneller umlaufenden Walzen und den Oberriemchen ein Reibungs- und Abstoppeffekt erfolgt.The invention is particularly concerned with the cleaning of such drafting systems. A cleaning device is already known from DE-A-2 217 314, in which a cleaning and stopping effect takes place by means of cleaning straps provided specifically for cleaning, by friction and movement thereof on the faster rotating rollers and the top straps.

Durch die DE-C-908 590 ist außerdem ein Riemchen-Streckwerk bekannt, bei welchem sich das Unterriemchen bis unterhalb des Einlaufzylinderpaares erstreckt. Eine Berührung des Unterriemchens mit dem unteren dieser Zylinder ist nicht vorhanden.DE-C-908 590 also discloses an apron drafting system in which the lower apron extends to below the pair of inlet cylinders. There is no contact of the lower apron with the lower of these cylinders.

Gemäß der Erfindung soll eine Reinigung des Unterriemchens und des unteren Einlaufzylinders erhalten werden. Sie ist dadurch gekennzeichnet, daß im Betrieb des Streckwerks sich das eine Trum des Unterriemchens mit dieser unteren Einlaufwalze in streifender Berührung befindet, und daß das andere Trum des Unterriemchens lose durchhängt.According to the invention, cleaning of the lower apron and the lower inlet cylinder is to be obtained. It is characterized in that in the operation of the drafting system one strand of the lower apron is in grazing contact with this lower inlet roller, and that the other strand of the lower apron sags loosely.

Erfindungsgemäß erhält man eine Reinigung des unteren Einlaufzylinders und des Unterriemchens durch Abstreifen derer Oberflächen, wobei keine speziell dem Putzen dienende Mittel vorgesehen werden müssen. Das Streckwerk ist somit von großer Einfachheit. Durch die kontinuierliche Reinigung der Walze wird die Gefahr der Wickelbildung erheblich herabgesetzt. Ein Haften von Fasern wird bereits im Anfangsstadium verhindert. Weil das Ober- und Unterriemchen zur Führung der Fasern während des Verzugsprozesses in der Hauptverzugszone dienen, und weil im Betrieb die Riemchen über Umlenkstellen geführt werden, ist es schon an sich notwendig, die Riemchen aus einem gegen Reibung widerstandsfähigen Material herzustellen. Insofern als nur eine leichte Berührung des Unterriemchens mit der unteren Einlaufwalze vorhanden ist, wird daher die Lebensdauer des Riemchens durch die Reinigungsanordnung praktisch kaum verändert.According to the invention, the lower inlet cylinder and the lower apron are cleaned by wiping off their surfaces, it not being necessary to provide any cleaning means. The drafting system is therefore extremely simple. Continuous cleaning of the roller significantly reduces the risk of winding formation. Adhesion of fibers is prevented at an early stage. Because the top and bottom straps are used to guide the fibers during the drafting process in the main drafting zone, and because the straps are guided over deflection points during operation, it is inherently necessary to produce the straps from a material that is resistant to friction. Insofar as there is only slight contact of the lower apron with the lower infeed roller, the service life of the apron is practically hardly changed by the cleaning arrangement.

Zusätzlich ergibt sich bei dem erfindungsgemäßen Streckwerk als ein überraschendes Resultat eine wesentliche Vereinfachung des Einfädeins, weil der durch das Einlaufwalzenpaar durchbewegte Luntenanfang beim Einfädeln nicht mehr von Hand zur Einlaufstelle des durch die Riemchen gebildeten Klemmbereichs geführt werden muß. Die Lunte kommt bei der erfindungsgemäßen Ausführung von selbst auf das Unterriemchen zu liegen, wird somit von diesem mitgenommen und gelangt in den Bereich der gegenseitigen Anlage der bewegten Riemchen, um weiter transportiert zu werden. Da die bei der Reinigung anfallenden Fasern auf das untere Riemchen zu liegen kommen, ergibt sich als weiterer Vorteil der Erfindung ein Wiedereinfügen der abgestreiften Fasern in die in der Hauptverzugszone zu verziehende Lunte, d. h. es ergibt sich ein Recycling der bei der Reinigung anfallenden Fasern.In addition, with the drafting system according to the invention, a surprising result is a significant simplification of threading, because the beginning of the sliver, which is moved through by the pair of inlet rollers, no longer has to be guided by hand to the point of entry of the clamping area formed by the straps. In the embodiment according to the invention, the fuse comes to rest on the lower strap by itself, is thus carried along by it and reaches the area of mutual contact of the moving straps in order to be transported further. Since the fibers produced during cleaning come to rest on the lower apron, there is a further advantage of the invention in that the stripped fibers are reinserted into the sliver to be drawn in the main drafting zone, i. H. there is a recycling of the fibers resulting from the cleaning.

Die Erfindung sei nun anhand von Ausführungsbeispielen und der Figur der Zeichnung näher erläutert. Die letztere zeigt ein durch eine obere und eine untere Einlaufwalze 11 bzw. 12 gebildetes Einlaufwalzenpaar, durch welches die durch den Kondenser 28 einlaufende Lunte 13 bzw. das einlaufende Vorgarn auf der Eintrittsseite des Streckwerks erfaßt und gemäß der Figur von rechts nach links transportiert wird. Anschließend sind eine ein Walzenpaar bildende, obere und untere Riemchenwalze 14 bzw. 15 vorgesehen. Dieses Walzenpaar dient zum Antreiben des Oberriemchens 16 und des Unterriemchens 17. Das Riemchen 16 wird um eine Umlenkstelle 18 geführt. Entsprechend sind zur Führung des Riemchens 17 eine Brücke 19 und eine Umlenkschiene 20 vorgesehen. Den beiden Riemchen 16, 17 nachfolgend ist ein durch eine obere und eine untere Auslaufwalze 23 bzw. 24 gebildetes Auslaufwalzenpaar vorhanden.The invention will now be explained in more detail using exemplary embodiments and the figure of the drawing. The latter shows a pair of inlet rollers formed by an upper and a lower inlet roller 11 and 12, respectively, through which the sliver 13 and the incoming roving entering through the condenser 28 are detected on the inlet side of the drafting system and transported from right to left as shown in the figure. Subsequently, an upper and lower apron roller 14 and 15 forming a pair of rollers are provided. This pair of rollers is used to drive the upper apron 16 and the lower apron 17. The apron 16 is guided around a deflection point 18. Correspondingly, a bridge 19 and a deflection rail 20 are provided for guiding the apron 17. Following the two straps 16, 17 there is a pair of outlet rollers formed by an upper and a lower outlet roller 23 and 24, respectively.

Eine Riemchenführung 21 ist an einem Lagersattel 22 befestigt. Der letztere dient in erster Linie zum Tragen der Riemchenunterwalze 15. Er ist in der zur Rotationsachse der Walze 15 senkrechten Richtung einstellbar. Diese Einstellung dient dazu, die Entfernung der durch die zusammenlaufenden Riemchen 16, 17 gebildete Eintrittsstelle für die Luntenfasern von den Auslaufwalzen 23, 24, d. h. die Länge der Hauptverzugszone, der verschiedenen Arten solcher Fasern anzupassen. Der Lagersattel 22 sowie der weitere Lagersattel 25 für die Einlaufwalze 12 sind von einem Träger 26 getragen.An apron guide 21 is attached to a bearing saddle 22. The latter is primarily used to support the apron lower roller 15. It can be adjusted in the direction perpendicular to the axis of rotation of the roller 15. This setting is used to remove the entry point for the sliver fibers formed by the converging straps 16, 17 from the outlet rollers 23, 24, i. H. to adjust the length of the main draft zone of the different types of such fibers. The bearing saddle 22 and the further bearing saddle 25 for the inlet roller 12 are carried by a carrier 26.

Der durch die gegeneinander gepreßten Walzen 14 und 15 gebildete Ort maximalen Drucks befindet sich zwischen den Riemchen 16, 17 längs einer zu den Rotationsachsen der Walzen 14,15 parallelen Linie, der sogenannten Klemmlinie 27. Der Bereich zwischen dem Einlaufwalzenpaar 11, 12 und der Klemmlinie 27 ist die Vorverzugszone. Der Bereich zwischen der Klemmlinie 27 und dem Auslaufwalzenpaar 23, 24 ist die Hauptverzugszone.The location of maximum pressure formed by the rollers 14 and 15 pressed against each other is located between the straps 16, 17 along a line parallel to the axes of rotation of the rollers 14, 15, the so-called clamping line 27. The area between the inlet roller pair 11, 12 and the clamping line 27 is the default zone. The area between the clamping line 27 and the outlet roller pair 23, 24 is the main draft zone.

Im Betrieb des Streckwerks drehen sich die Walzen 11, 12, 14, 15 und 23, 24 im durch die Pfeile angegebenen Drehsinn. Die Umfangsgeschwindigkeit der Einlaufwalzen 11, 12 und der Riemchenwalzen 14, 15 ist relativ klein, wobei diejenige der Einlaufwalzen 11, 12 noch etwas kleiner ist als diejenige der Riemchenwalzen 14, 15 und damit auch der Geschwindigkeit der Riemchen 16, 17. Dadurch erhält man in der Vorverzugszone ein leichtes Verziehen der Lunte 12. Die Umfangsgeschwindigkeit der Walzen 23, 24 ist jedoch viel größer als diejenige der Walzen 14, 15, so daß im Hauptverzugsbereich der eigentliche Verzug der Lunte stattfindet.When the drafting system is in operation, the rollers 11, 12, 14, 15 and 23, 24 rotate in the direction of rotation indicated by the arrows. The peripheral speed of the inlet rollers 11, 12 and Strap rollers 14, 15 are relatively small, and that of the feed rollers 11, 12 is still somewhat smaller than that of the strap rollers 14, 15 and thus also the speed of the straps 16, 17. The peripheral speed of the rollers 23, 24 is, however, much greater than that of the rollers 14, 15, so that the actual warping of the fuse takes place in the main drafting region.

Gemäß der Erfindung sind die Walzen 11, 12 und 14, 15 und die Umlenkschiene 20 in der Weise angeordnet, daß im Betrieb des Streckwerks das Unterriemchen 17 sich mit der unteren Einlaufwalze 12 in Berührung befindet, d. h. an der Walze 12 streift. Es ist ersichtlich, daß sich an der Berührungsstelle die Oberfläche der Walze 12 und das Riemchen 17 in entgegengesetzten Richtungen bewegen. An der Walze 12 haftende Fasern werden dabei vom Riemchen 17 abgestreift und bleiben auf dem letzteren liegen, d. h. sie werden von diesem mitgenommen. Dabei gelangen sie wieder in die Faserlunte 12, mit der sie bei deren Weiterverarbeitung vermischt werden.According to the invention, the rollers 11, 12 and 14, 15 and the deflection rail 20 are arranged in such a way that the lower apron 17 is in contact with the lower infeed roller 12 during operation of the drafting system, i. H. grazes on the roller 12. It can be seen that at the point of contact the surface of the roller 12 and the strap 17 move in opposite directions. Fibers adhering to the roller 12 are stripped from the straps 17 and remain on the latter, i. H. they are taken away by it. They then return to the fiber sliver 12, with which they are mixed during their further processing.

In der Figur ist noch eine zweite Ausführungsform der Erfindung gezeigt. Gemäß dieser wird durch entsprechende, gegenseitige Anordnung der Brücke 19 und der Auslaufwalze 24 zusätzlich eine Berührung des Unterriemchens 17 mit der unteren Auslaufwalze 24 erhalten. Auch in diesem Fall bewegt sich an der Berührungsstelle die Oberfläche der Walze 24 entgegengesetzt zur Bewegung des Riemchens 17. Auf diese Weise wird auch eine Reinigung der unteren Auslaufwalze 24 erzielt.A second embodiment of the invention is shown in the figure. According to this, a corresponding mutual arrangement of the bridge 19 and the outlet roller 24 additionally contacts the lower apron 17 with the lower outlet roller 24. In this case too, the surface of the roller 24 moves in the opposite direction to the movement of the apron 17. In this way, cleaning of the lower outlet roller 24 is also achieved.

Durch den Zug der Walzen 14, 15 am Riemchen 17 und als Folge der Reibung desselben an der Umlenkschiene 20, befindet sich das Riemchen 17 zwischen den Walzen 14, 15 und der Schiene 20 in angespanntem Zustand und ist aus diesem Grunde im Betrieb des Streckwerks gegen die Walze 12 hin vorgespannt. Im Gegensatz dazu befindet sich der zwischen den Teilen 19 und 20 befindliche Trum des Riemchens 17 in losem Zustand. Das Anliegen desselben an die Walze 24 ist eine Folge der natürlichen Steifigkeit des Riemchens 17.Due to the pull of the rollers 14, 15 on the apron 17 and as a result of the friction of the same on the deflection rail 20, the apron 17 between the rollers 14, 15 and the rail 20 is in a tensioned state and is therefore against the operation of the drafting system the roller 12 biased. In contrast, the strand of straps 17 between parts 19 and 20 is in a loose state. The fact that it bears against the roller 24 is a consequence of the natural rigidity of the apron 17.

Falls ein stärkeres Anliegen an die Walze 24 erwünscht ist, kann ein solches durch eine weitere Ausführungsform auf einfache Art erreicht werden. Bei dieser ist der sich nach unten erstreckende Teil der Brücke 19 mit einem entsprechenden Fortsatz 29 versehen, wie dies strichliert angedeutet ist. Durch die Wahl der Ausgestaltung des Fortsatzes 29 kann die gewünschte Stärke des Anliegens an die Walze 24 beliebig gewählt werden.If a stronger contact with the roller 24 is desired, this can be achieved in a simple manner by a further embodiment. In this case, the downwardly extending part of the bridge 19 is provided with a corresponding extension 29, as is indicated by dashed lines. By choosing the design of the extension 29, the desired strength of the contact with the roller 24 can be chosen as desired.

Es ist ersichtlich, daß beim Einfädeln der Lunte 13 diese nach dem Durchtritt zwischen den Walzen 11, 12 im Falle eines unerwünschten Herunterhängens auf dem Unterriemchen 17 aufliegen muß und somit von diesem mitgenommen wird und dadurch anschließend zwischen die Riemchen 16, 17 gelangt. Aus diesem Grund ergibt sich der eingangs als überraschendes Resultat erwähnte Vorteil eines im wesentlichen automatischen Einfädelns.It can be seen that when the fuse 13 is threaded, it must rest on the lower strap 17 after it has passed through between the rollers 11, 12 in the event of undesired hanging down and is thus carried along by it and thereby subsequently passes between the straps 16, 17. For this reason, there is the advantage of essentially automatic threading mentioned at the beginning as a surprising result.

In einer weiteren Ausführungsform der vorliegenden Erfindung ist eine Riemchenführung 21 zum seitlichen Führen des Riemchens 17 vorhanden. Die Verwendung eines losen Riemchens 17 bewirkt eine kleinere Reibung und damit eine Erhöhung der Lebensdauer desselben. Durch die Riemchenführung 21 wird das Abwandern des losen Riemchens verhindert und somit ein einwandfreies Arbeiten des Streckwerkes gewährleistet.In a further embodiment of the present invention, an apron guide 21 is provided for guiding the apron 17 laterally. The use of a loose strap 17 causes less friction and thus an increase in the life of the same. The strap guide 21 prevents the loose strap from migrating and thus ensures that the drafting system functions properly.

Eine sehr präzise Führung für das Riemchen 17 wird erhalten, wenn sich die Führung so nahe wie möglich an der Einlaufstelle zum Klemmbereich der Riemchen 16, 17 befindet. Darpit besteht eine weitere, vorteilhafte Ausführungsform der Erfindung beim Vorliegen eines losen Unter- riemchens 17 darin, daß die Riemchenführung 21 am Lagersattel 22 befestigt ist. In diesem Fall wird beim durch Verschieben des Lagersatte)s 22 erfolgenden, horizontalen Einstellen der Walzen 14, 15 an verschiedene Faserarten, insbesondere Faserlängen, die Führung 21 mitbewegt. Ein einmal eingestellter, optimaler Abstand der Walze 14, 15 von der Riemchenführung 21 bleibt somit beim Anpassen an verschiedene Faserarten stets erhalten.A very precise guidance for the straps 17 is obtained if the guidance is as close as possible to the entry point to the clamping area of the straps 16, 17. Darpit is a further advantageous embodiment of the invention when there is a loose bottom strap 17 in that the strap guide 21 is attached to the bearing saddle 22. In this case, the guide 21 is also moved during the horizontal adjustment of the rollers 14, 15 to different types of fibers, in particular fiber lengths, by displacing the bearing plate 22. A once optimal distance of the roller 14, 15 from the apron guide 21 is thus always maintained when adapting to different types of fibers.

Claims (5)

1. Drafting mechanism for a spinning machine with a break draft zone and a main draft zone, with an entry roll pair comprising an upper roll (11) and a lower roll (12), with an exit roll pair (23, 24) comprising an upper and a lower roll and with an upper apron (16) and a lower apron (17) driven by an apron roll pair (14,15), the break draft zone extending between entry roll pair (11, 12) and the nip line formed by the apron rolls (14,15) pressed against the upper and lower aprons, and the main draft zone extends between this nip line and the exit roll pair (23, 24), the lower apron (17) extending beneath the break draft zone and the lower entry roll (12), characterised in that in operation of the drafting mechanism one run of the lower apron (17) is in grazing contact with this lower entry roll (12) and in that the other run of the lower apron hangs loose.
2. Drafting mechanism according to claim 1, characterised in that in operation thereof the lower apron (17) is also in grazing contact with the lower exit roll (24).
3. Drafting mechanism according to claim 2, characterised in that at the exit from the nip region formed by the aprons (16, 17) a guiding bridgepiece is provided to guide the lower apron (17) and the bridgepiece has an extension (29) to guide the lower apron (17) which causes contact of the latter with the lower exit roll (24).
4. Drafting mechanism according to claim 1, characterised in that a lateral apron guide (21) is provided for the lower apron (17) before the entry to the nip region formed by the aprons (16, 17).
5. Drafting mechanism according to claim 4, characterised in that the apron guide is secured to a bearing saddle (22) carrying the lower apron roll (15).
EP83105255A 1982-07-23 1983-05-27 Drawing frame for a spinning machine Expired EP0099973B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4503/82 1982-07-23
CH450382 1982-07-23

Publications (2)

Publication Number Publication Date
EP0099973A1 EP0099973A1 (en) 1984-02-08
EP0099973B1 true EP0099973B1 (en) 1985-09-11

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EP83105255A Expired EP0099973B1 (en) 1982-07-23 1983-05-27 Drawing frame for a spinning machine

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US (1) US4509230A (en)
EP (1) EP0099973B1 (en)
JP (1) JPS5921727A (en)
DE (1) DE3360782D1 (en)
IN (1) IN159551B (en)

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DE10348452B4 (en) * 2003-10-17 2008-07-03 Deutsche Institute für Textil- und Faserforschung Stuttgart Drafting system with twin top rollers wrapped in aprons
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Also Published As

Publication number Publication date
EP0099973A1 (en) 1984-02-08
IN159551B (en) 1987-05-23
DE3360782D1 (en) 1985-10-17
US4509230A (en) 1985-04-09
JPH0340128B2 (en) 1991-06-18
JPS5921727A (en) 1984-02-03

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