EP0222101B1 - Method for piecing a yarn in a friction-spinning device - Google Patents

Method for piecing a yarn in a friction-spinning device Download PDF

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Publication number
EP0222101B1
EP0222101B1 EP86112564A EP86112564A EP0222101B1 EP 0222101 B1 EP0222101 B1 EP 0222101B1 EP 86112564 A EP86112564 A EP 86112564A EP 86112564 A EP86112564 A EP 86112564A EP 0222101 B1 EP0222101 B1 EP 0222101B1
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EP
European Patent Office
Prior art keywords
yarn
lap
air stream
friction spinning
spinning
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EP86112564A
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German (de)
French (fr)
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EP0222101A1 (en
Inventor
Emil Briner
Richard Hieronymi
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Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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Priority to AT86112564T priority Critical patent/ATE42777T1/en
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/48—Piecing arrangements; Control therefor
    • D01H4/52—Piecing arrangements; Control therefor for friction spinning

Definitions

  • the invention relates to a method for spinning a yarn on a friction spinning device, in which free-flying fibers in a fiber conveying channel are delivered to a friction spinning surface of a friction spinning means and are conveyed on this friction spinning surface to a yarn formation point, from which a yarn is drawn off by thread take-off means.
  • Such a device is known from DE-OS 3 318 687, in which a yarn end is picked up by a turned-back spool by a suction device and this sucked-in yarn is held in the gusset gap by two stopped friction spinning drums by means of two lifting devices.
  • the yarn Before free-flying fibers are delivered to this yarn, the yarn is opened by turning back the friction spinning drum, so that its fibers lie essentially without rotation in the gusset gap of the friction spinning drums.
  • the friction spinning drums are then put into operation at a reduced speed in the normal direction of rotation and free-flying fibers are fed to the opened yarn, and the resulting yarn is drawn off at a correspondingly reduced speed and fed to a connecting means.
  • the delivered yarn is picked up by a suction nozzle that functions as a yarn store.
  • the entire device is brought up to the operating speed and then decoupled from the necessary auxiliary drive means and driven by the normal drive means at the operating speed.
  • the method according to the invention achieves the object by the features listed in the characterizing part of the first claim.
  • FIG. 1 shows a fiber sliver dissolving device 1 known from the rotor open-end spinning method, with an opening roller (not shown) indicated by a drive shaft 1.1 and with a feed opening A provided for receiving a sliver (not shown) by means of a connection to the opening device 1 adjoining fiber conveying channel 2, free-flowing fibers are discharged through a flow of air flowing through this onto a perforated rotatable and drivable friction spinning drum 3, on which a yarn end 5.1 developing into a yarn 5 is formed at a yarn formation point 7 (FIG. 2) becomes.
  • a counter-roller 4 which can also be rotated and driven, which is arranged in a contact-free manner, but very close (for example between 0.05 and 0.15 mm) to the friction spinning drum 3 and in parallel thereto, serves as an aid for screwing in the fibers in the gusset gap of the two rolls of yarn formation point 7.
  • the finished yarn 5 is drawn off by a yarn take-off means provided as a pair of take-off rollers 6.
  • a yarn take-off means provided as a pair of take-off rollers 6.
  • Such devices are known per se from previous publications in the patent literature and are therefore not described further.
  • the English Patent No. 1 231 198 shows a basically the same method, but in which a perforated disc is provided instead of a perforated roller and a conical counter-roller instead of a cylindrical one.
  • a blowing channel 8 opens above the yarn formation point into the gusset gap of the two friction spinning drums 3 and 4 (also called friction spinning rollers 3 and 4).
  • the length G of the outlet mouth 9 of the blowing channel 8 corresponds at least to the length F (FIG. 1) of the perforation of the friction spinning drum 3, while the length H of the outlet mouth 22 of the fiber conveying channel 2 corresponds at most to the length F of the perforation.
  • This perforation is marked with P in FIG. 1 and is only shown in sections.
  • the width (not marked) and shape of the outlet mouth 9 of the blow channel 8 being understood to mean the design of the outlet mouth surface in order to be able to vary the intensity of the air flow at the mouth.
  • the width of the outlet mouth can be designed differently within the length of the outlet mouth in order to obtain differences in the blowing effect along the outlet mouth.
  • the blow duct 8 also has a connecting piece 10, by means of which it can be connected to a compressed air network, not shown, with all the elements known per se for regulating the air pressure and the air quantity and for controlling the air flow.
  • FIG. 3a it is shown with the distance D.1 that the outlet mouth 9 of the blow channel can be further away from the yarn end 5.1 than the outlet mouth 22 of the fiber conveying channel 2 which is at a distance K.
  • blow-out duct 8.1 which is indicated by dash-dotted lines in FIG. 3, that the position of the duct is not tied to the position of the blow-out duct 8, shown with solid lines, without a loss of the blowing action described later being found.
  • the air flow in the fiber conveying channel 2 for conveying the fibers 11 from the opening roller (not shown) belonging to the opening device 1 to the friction spinning drum 3 is generated in a manner known per se by a suction nozzle 23 located in the friction spinning drum 3, which is located on the surface of the friction spinning drum 3 generates a suction air flow along the length F of the perforation P, within which the yarn end 5.1 is located on the one hand and the outlet mouth 22 of the fiber conveying channel 2 on the other.
  • fibers 11 are initially fed onto the friction spinning drum 3 by means of the fiber feed channel 8 without first pulling these fibers off as yarn, so that a rotating spool 12 that grows larger is formed.
  • a suction device 13 as a yarn pick-up means is brought to the diverging side of the pair of take-off rollers 6 rotating in the direction of the arrow in such a way that it is able to take over the roll 12 emitted by the take-off roller pair 6.
  • the guide tube 15 is, as shown in Fig. 2, provided between the end faces of the friction rollers 3 and 4 and the take-off rollers 6, in such a way that the axis of symmetry (not shown) of the guide tube lies essentially in an imaginary plane which is the line of contact (not shown) of the two take-off rolls 6 and also includes the location on the friction spinning drum 3 at which the yarn 5 leaves this friction spinning drum.
  • This guide tube 15 is larger than the outside diameter of the aforementioned fiber roll 12, for example twice as large.
  • the outlet mouth of the guide tube 15 can be provided with recesses such that the outlet mouth is adapted to the peripheral surface of the take-off rollers 6.
  • the guide tube can be designed as an injector guide tube 15.1 by providing blow-in openings 16 and 17, which give a force component in the yarn withdrawal direction Z to an air stream guided through these openings.
  • the air flow mentioned is generated by a ring-shaped pressure chamber 18, which is under overpressure and is provided around these injection openings 16 and 17.
  • the pressure chamber 18 itself is fed via a connecting bore 19 from a compressed air system, not shown, of which a connecting pipe 20 is the last link.
  • the connecting pipe 20 is fixedly connected to a pressure housing 21 containing the pressure chamber 18 and the connecting bore 19.
  • the pressure housing 21 serves to hold the injector guide tube 15.1 firmly and seals the pressure chamber 18 from the atmosphere.
  • the injector guide tube 15.1 therefore has the advantage over the guide tube 15 of positively conveying the aforementioned winding 12 into the converging space of the take-off rollers 6 when spinning on.
  • the yarn 5 which is then also sucked in (see FIG. 7) is guided by means of this suction device 13 to the further elements belonging to the spinning machine (not shown) but not mentioned here.
  • the aforementioned piecing process can be carried out at full production speed, so that the yarn delivered by the take-off rollers corresponds to the yarn to be produced.
  • Such a device with said band is shown, for example, in French Patent Application No. 2,480,799.
  • a mechanical holding device (not shown) can also be used instead of the suction device 13.
  • the receiving device only has to be able to receive the winding 12 and the subsequent yarn 5 at the production speed in the manner mentioned.
  • the order is chosen so that the fibers 11 are delivered first and the air flow mentioned only after receipt of a roll 12 of the desired or predetermined size is turned on.
  • the switching on of the air flow can be used before the fibers 11 are delivered in order to clean the surface of the friction spinning drum 3 and the counter roller 4 if necessary.
  • This cleaning air flow corresponding to the one mentioned earlier, can optionally be maintained before the delivery of the fibers 11 or switched off beforehand.
  • the dash-dotted line L indicates the mean flow line of the air flow guided in the blow duct and shows with the angle a that this flow line L is inclined to the yarn end 5.1 such that the air flow mentioned is directed towards the pair of draw-off rollers 6 the force component R acting on the winding 12 is generated.
  • the angle a is advantageously chosen to be less than 45 degrees.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Abstract

In order to start or recommence spinning of a yarn in a friction spinning device, the following method steps are carried out upon start-up of a new spinning operation or upon piecing after a thread break: fibers separated by an opening device are delivered by means of a fiber transporting passage to a rotating friction spinning drum and are twisted to form a twisted fiber structure; when the twisted fiber structure has substantially reached a predeterminate diameter or size, then the twisted fiber structure is transported by an airstream delivered by a pressure duct towards and into a guide tube and is forwarded therein into a convergent space of rotating withdrawal rolls; and the twisted fiber structure is caught at production speed by these withdrawal rolls and delivered on a divergent side of the withdrawal rolls to a receiving suction device which transfers the spun yarn subsequent to the twisted fiber structure to further processing elements.

Description

Die Erfindung betrifft ein Verfahren zum Anspinnen eines Garnes an einer Friktionsspinnvorrichtung, in welcher frei fliegende Fasern in einem Faserförderkanal auf eine Friktionsspinnfläche eines Friktionsspinnmittels abgegeben und auf dieser Friktionsspinnfläche zu einer Garnbildungsstelle gefördert werden, ab welcher ein Garn durch Gamabzugsmittel abgezogen wird.The invention relates to a method for spinning a yarn on a friction spinning device, in which free-flying fibers in a fiber conveying channel are delivered to a friction spinning surface of a friction spinning means and are conveyed on this friction spinning surface to a yarn formation point, from which a yarn is drawn off by thread take-off means.

Die bisher bekannten Verfahren und Vorrichtungen zum vorerwähnten Anspinnen eines Garnes bedienen sich eines von einer Spule her zurückgeholten Garnendes, welches für das Anspinnen in stillstehende Friktionsspinnmittel gegeben wird, um anschliessend daran das Anspinnen bei reduzierter Geschwindigkeit der Friktionsspinnvorrichtung, durch Zuführen von Fasern an das zurückgeholte Garnende durchzuführen. Es wird auch vorgeschlagen, dass vor dem Anspinnen, d.h. vor dem Zuführen der frei fliegenden Fasern an das eingebrachte Garnende, dasselbe durch ein Bewegen der Friktionsspinnmittel in entgegengesetzer Richtung aufgedreht wird, um dadurch die angelieferten Fasern besser mit dem Garnende zu verbinden resp. zu verflechten.The previously known methods and devices for the aforementioned piecing of a yarn make use of a yarn end which has been retrieved from a bobbin and which is put into stationary friction spinning means for piecing, in order to then start the piecing at a reduced speed of the friction spinning device by feeding fibers to the retrieved yarn end perform. It is also suggested that before piecing, i.e. before feeding the free-flying fibers to the inserted yarn end, the same is turned up by moving the friction spinning means in the opposite direction, in order to better connect the delivered fibers to the yarn end or. to intertwine.

Eine solche Vorrichtung ist aus der DE-OS 3 318 687 her bekannt, in welcher ein Garnende von einer zurückgedrehten Spule durch eine Absaugvorrichtung aufgenommen und dieses angesaugte Garn mittels zweier Hubvorrichtungen in den Zwickelspalt von zwei stillgesetzten Friktionsspinntrommeln gehalten wird.Such a device is known from DE-OS 3 318 687, in which a yarn end is picked up by a turned-back spool by a suction device and this sucked-in yarn is held in the gusset gap by two stopped friction spinning drums by means of two lifting devices.

Vor dem Anliefern von frei fliegenden Fasern an dieses Garn wird das Garn durch Zurückdrehen der Friktionsspinntrommel geöffnet, so dass dessen Fasern im wesentlichen drehungsfrei im Zwickelspalt der Friktionsspinntrommeln liegen. Anschliessend werden die Friktionsspinntrommeln mit reduzierter Geschwindigkeit in normaler Drehrichtung in Betrieb gesetzt und frei fliegende Fasern dem geöffneten Garn zugespeist, sowie das dadurch entstehende Garn mit entsprechend reduzierter Geschwindigkeit abgezogen und einem Verbindungsmittel zugeführt.Before free-flying fibers are delivered to this yarn, the yarn is opened by turning back the friction spinning drum, so that its fibers lie essentially without rotation in the gusset gap of the friction spinning drums. The friction spinning drums are then put into operation at a reduced speed in the normal direction of rotation and free-flying fibers are fed to the opened yarn, and the resulting yarn is drawn off at a correspondingly reduced speed and fed to a connecting means.

Um das weiterhin kontinuierlich zugelieferte Garn während der für das Verbinden benötigten Zeit zu übernehmen, wird das angelieferte Garn von einer als Garnspeicher funktionierenden Saugdüse aufgenommen.In order to take over the continuously supplied yarn during the time required for the connection, the delivered yarn is picked up by a suction nozzle that functions as a yarn store.

Nach Abschluss der Verbindung wird die gesamte Vorrichtung auf Betriebsgeschwindigkeit hochgefahren und anschliessend von den notwendigen Hilfsantriebsmitteln abgekoppelt und durch die Normalantriebsmittel mit der Betriebsgeschwindigkeit angetrieben.After the connection has been completed, the entire device is brought up to the operating speed and then decoupled from the necessary auxiliary drive means and driven by the normal drive means at the operating speed.

Der Nachteil einer solchen Vorrichtung besteht in der Vielzahl von Hilfseinrichtungen für den Anspinn-Vorgang. Es ist deshalb Aufgabe der Erfindung, ein Verfahren zum Anspinnen eines Garnes an einer Friktionsspinnvorrichtung zu finden, welches unkompliziert und mit relativ einfachen Mitteln durchführbar ist.The disadvantage of such a device is the large number of auxiliary devices for the piecing process. It is therefore an object of the invention to find a method for spinning a yarn on a friction spinning device which is uncomplicated and can be carried out with relatively simple means.

Das erfindungsgemässe Verfahren löst die Aufgabe durch die im Kennzeichen des ersten Anspruches aufgeführten Merkmale.The method according to the invention achieves the object by the features listed in the characterizing part of the first claim.

Weitere vorteilhafte Verfahrensschritte sind in den weiteren Ansprüchen aufgeführt.Further advantageous process steps are listed in the further claims.

Die durch die Erfindung erreichten Vorteile sind im wesentlichen darin zu sehen, dass eine Vorrichtung zur Durchführung des Verfahrens infolge der Möglichkeit, das Anspinnen bei Produktionsgeschwindigkeit durchzuführen, relativ einfach sein kann.The advantages achieved by the invention can essentially be seen in the fact that an apparatus for carrying out the method can be relatively simple owing to the possibility of carrying out the piecing at the production speed.

Im folgenden wird die Erfindung anhand von lediglich einen Ausführungsweg darstellenden Zeichnungen erläutert. Es zeigt:

  • Fig. 1 eine Friktionsspinnvorrichtung, halbschematisch und perspektivisch dargestellt,
  • Fig. 2 einen Teil der Vorrichtung von Fig. 1 in Längsrichtung dargestellt,
  • Fig. 3 einen Teil der Vorrichtung von Fig. 1, in Frontansicht, in Richtung I (Fig. 2) dargestellt,
  • Fig. 3a eine Variante der Vorrichtung von Fig. 3,
  • Fig. 4 eine Variante eines Teiles der Vorrichtung von Fig. 2, im Schnitt dargestellt,
  • Fig. 5 die Vorrichtung von Fig. 1 von der gegenüberliegenden Seite und nur teilweise, sowie in einer Verfahrensstufe des Anspinnens gezeigt,
  • Fig. 6 und 7 die Vorrichtung von Fig. 1 in Verfahrensstufen des Anspinnens gezeigt.
In the following, the invention will be explained with reference to drawings showing only one embodiment. It shows:
  • 1 is a friction spinning device, shown semi-schematically and in perspective,
  • 2 shows part of the device of FIG. 1 in the longitudinal direction,
  • 3 shows a part of the device of FIG. 1, in a front view, in the direction I (FIG. 2),
  • 3a shows a variant of the device of FIG. 3,
  • 4 shows a variant of part of the device of FIG. 2, shown in section,
  • 5 shows the device of FIG. 1 from the opposite side and only partially, as well as in a process step of piecing,
  • 6 and 7 the device of Fig. 1 shown in process stages of piecing.

Fig. 1 zeigt eine aus dem Rotor-Offenend-Spinnverfahren her bekannte Faserbandauflösevorrichtung 1, mit einer durch eine Antriebswelle 1.1 angedeuteten Auflösewalze (nicht gezeigt) und mit einer für die Aufnahme eines Faserbandes (nicht gezeigt) vorgesehenen Einspeiseöffnung A. Mittels eines an die Auflösevorrichtung 1 anschliessenden Faserförderkanals 2 werden durch einen diesen durchströmenden Luftstrom frei fliegende Fasern auf eine perforierte dreh- und antreibbare Friktionsspinntrommel 3 abgegeben, auf welcher in an sich bekannter Weise an einer Garnbildungsstelle 7 (Fig. 2) ein sich zu einem Garn 5 entwickelndes Garnende 5.1 gebildet wird. Eine ebenfalls dreh-und antreibbare Gegenwalze 4, welche berührungsfrei, jedoch sehr nahe (z.B. zwischen 0,05 und 0,15 mm) an der Friktionsspinntrommel 3 und parallel dazu angeordnet ist, dient als Hilfe für das Eindrehen der Fasern an der sich im Zwickelspalt der beiden Walzen befindlichen Garnbildungsstelle 7. Dabei wird das fertige Garn 5 durch ein als Abzugswalzenpaar 6 vorgesehenes Garnabzugsmittel abgezogen. Solche Vorrichtungen sind an sich aus früheren Veröffentlichungen in der Patentliteratur bekannt und deshalb nicht weiter beschrieben. Beispielsweise zeigt die englische Patentschrift Nr. 1 231 198 ein grundsätzlich gleiches Verfahren, bei welchem jedoch anstelle einer perforierten Walze eine perforierte Scheibe und anstelle einer zylindrischen eine kegelförmige Gegenwalze vorgesehen ist.1 shows a fiber sliver dissolving device 1 known from the rotor open-end spinning method, with an opening roller (not shown) indicated by a drive shaft 1.1 and with a feed opening A provided for receiving a sliver (not shown) by means of a connection to the opening device 1 adjoining fiber conveying channel 2, free-flowing fibers are discharged through a flow of air flowing through this onto a perforated rotatable and drivable friction spinning drum 3, on which a yarn end 5.1 developing into a yarn 5 is formed at a yarn formation point 7 (FIG. 2) becomes. A counter-roller 4, which can also be rotated and driven, which is arranged in a contact-free manner, but very close (for example between 0.05 and 0.15 mm) to the friction spinning drum 3 and in parallel thereto, serves as an aid for screwing in the fibers in the gusset gap of the two rolls of yarn formation point 7. The finished yarn 5 is drawn off by a yarn take-off means provided as a pair of take-off rollers 6. Such devices are known per se from previous publications in the patent literature and are therefore not described further. For example, the English Patent No. 1 231 198 shows a basically the same method, but in which a perforated disc is provided instead of a perforated roller and a conical counter-roller instead of a cylindrical one.

Im weiteren mündet neben dem Faserförderkanal 2 ein Blaskanal 8 über der Garnbildungsstelle in den Zwickelspalt der beiden Friktionsspinntrommeln 3 und 4 (auch Friktionsspinnwalzen 3 und 4 genannt). Die Länge G der Austrittsmündung 9 des Blaskanales 8 entspricht mindestens der Länge F (Fig. 1) der Perforation der Friktionsspinntrommel 3, während die Länge H der Austrittsmündung 22 des Faserförderkanales 2 im Maximum der Länge F der Perforation entspricht. Diese Perforation ist in Fig. 1 mit P gekennzeichnet und nur ausschnittsweise gezeigt.In addition to the fiber conveyor channel 2, a blowing channel 8 opens above the yarn formation point into the gusset gap of the two friction spinning drums 3 and 4 (also called friction spinning rollers 3 and 4). The length G of the outlet mouth 9 of the blowing channel 8 corresponds at least to the length F (FIG. 1) of the perforation of the friction spinning drum 3, while the length H of the outlet mouth 22 of the fiber conveying channel 2 corresponds at most to the length F of the perforation. This perforation is marked with P in FIG. 1 and is only shown in sections.

Die Relation der Distanz D resp. D 1 (Fig. 3 resp. Fig. 3a) zwischen der Austrittsmündung 9 und dem sich in der Garnbildungsstelle 7 befindlichen Garnende 5.1 zur Blasintensität an der Austrittsmündung 9 des Blaskanals 8 muss aufgrund der später beschriebenen Verfahrensschritte des Anspinnens empirisch ermittelt werden.The relation of the distance D resp. D 1 (Fig. 3 and Fig. 3a) between the outlet mouth 9 and the yarn end 5.1 located in the yarn formation point 7 on the blowing intensity at the outlet mouth 9 of the blowing channel 8 must be determined empirically on the basis of the process steps of piecing described later.

Dasselbe gilt für die Breite (nicht gekennzeichnet) und Form der Austrittsmündung 9 des Blaskanales 8, wobei unter Form der Austrittsmündung die Gestaltung der Austrittsmündungsfläche verstanden werden soll, um die Intensität des Luftstromes an der Mündung variabel gestalten zu können. Beispielsweise kann die Breite der Austrittsmündung innerhalb der Länge der Austrittsmündung unterschiedlich gestaltet werden, um dadurch Unterschiede des Blaseffektes entlang der Austrittsmündung zu erhalten.The same applies to the width (not marked) and shape of the outlet mouth 9 of the blow channel 8, the shape of the outlet mouth being understood to mean the design of the outlet mouth surface in order to be able to vary the intensity of the air flow at the mouth. For example, the width of the outlet mouth can be designed differently within the length of the outlet mouth in order to obtain differences in the blowing effect along the outlet mouth.

Der Blaskanal 8 weist ausserdem einen Anschlussstutzen 10 auf, mittels welchem dieser an ein nicht gezeigtes Druckluftnetz, mit allen an sich bekannten, für die Regulierung des Luftdruckes und der Luftmenge sowie der Steuerung des Luftstromes notwendigen Elementen anschliessbar ist.The blow duct 8 also has a connecting piece 10, by means of which it can be connected to a compressed air network, not shown, with all the elements known per se for regulating the air pressure and the air quantity and for controlling the air flow.

In Fig. 3a ist mit dem Abstand D.1 dargestellt, dass die Austrittsmündung 9 des Blaskanales weiter von dem Garnende 5.1 entfernt sein kann, als die mit dem Abstand K entfernte Austrittsmündung 22 des Faserförderkanales 2.In FIG. 3a it is shown with the distance D.1 that the outlet mouth 9 of the blow channel can be further away from the yarn end 5.1 than the outlet mouth 22 of the fiber conveying channel 2 which is at a distance K.

Ausserdem soll mit dem in Fig. 3 mit strichpunktierten Linien andeutungsweise dargestellten Ausblaskanal 8.1 gezeigt sein, dass die Lage des Kanales nicht an die Lage des mit ausgezogenen Linien dargestellten Ausblaskanales 8 gebunden ist, ohne dass im wesentlichen eine Einbusse der später beschriebenen Blaswirkung festzustellen wäre.In addition, it should be shown with the blow-out duct 8.1, which is indicated by dash-dotted lines in FIG. 3, that the position of the duct is not tied to the position of the blow-out duct 8, shown with solid lines, without a loss of the blowing action described later being found.

Der Luftstrom im Faserförderkanal 2 zur Förderung der Fasern 11 von der zur Auflösevorrichtung 1 gehörenden (nicht gezeigten) Auflösewalze bis zur Friktionsspinntrommel 3, wird in an sich bekannter Weise durch eine sich in der Friktionsspinntrommel 3 befindliche Saugdüse 23 erzeugt, welche an der Oberfläche der Friktionsspinntrommel 3 auf der Länge F der Perforation P einen Ansaugluftstrom erzeugt, innerhalb welchem sich einerseits das Garnende 5.1 und andererseits die Austrittsmündung 22 des Faserförderkanals 2 befindet.The air flow in the fiber conveying channel 2 for conveying the fibers 11 from the opening roller (not shown) belonging to the opening device 1 to the friction spinning drum 3 is generated in a manner known per se by a suction nozzle 23 located in the friction spinning drum 3, which is located on the surface of the friction spinning drum 3 generates a suction air flow along the length F of the perforation P, within which the yarn end 5.1 is located on the one hand and the outlet mouth 22 of the fiber conveying channel 2 on the other.

Im folgenden ist der Vorgang für das Anspinnen beim Neuanspinnen sowie beim Anspinnen nach einem Fadenbruch beschrieben.The procedure for piecing when re-piecing and piecing after a thread break is described below.

Wie in Fig. 5 gezeigt, werden beim Anspinnen vorerst mittels des Faserförderkanals 8 Fasern 11 auf die Friktionsspinntrommel 3 gespeist, ohne diese Fasern vorerst als Garn abzuziehen, so dass sich ein grösser werdender, drehender Wickel 12 bildet.As shown in FIG. 5, fibers 11 are initially fed onto the friction spinning drum 3 by means of the fiber feed channel 8 without first pulling these fibers off as yarn, so that a rotating spool 12 that grows larger is formed.

In Fig. 5 ist, um diesen Wickel besser darstellen zu können, die Gegenwalze 4 nicht dargestellt.In FIG. 5, in order to be able to better illustrate this winding, the counter roller 4 is not shown.

Hat nun dieser Wickel 12 eine vorgegebene Grösse erreicht, so wird einerseits eine Saugvorrichtung 13 als Garnaufnahmemittel derart an die divergierende Seite des sich in Pfeilrichtung drehenden Abzugswalzenpaares 6 gebracht, dass dieses in der Lage ist, den vom Abzugswalzenpaar 6 abgegebenen Wickel 12 zu übernehmen.If this winding 12 has now reached a predetermined size, on the one hand a suction device 13 as a yarn pick-up means is brought to the diverging side of the pair of take-off rollers 6 rotating in the direction of the arrow in such a way that it is able to take over the roll 12 emitted by the take-off roller pair 6.

Anderseits wird, nachdem der Wickel 12 wie vorerwähnt die vorgegebene Grösse erreicht hat, Druckluft durch den Blaskanal 8 gegeben, wodurch der Wickel 12 in die Eintrittsöffnung 14 eines Führungsrohres 15, sowie durch dieses Führungsrohr 15 in den konvergierenden Raum des sich drehenden Abzugswalzenpaares 6 gegeben wird.On the other hand, after the winding 12 has reached the predetermined size as mentioned above, compressed air is passed through the blowing duct 8, whereby the winding 12 is fed into the inlet opening 14 of a guide tube 15 and through this guide tube 15 into the converging space of the rotating pair of extraction rollers 6 .

Das Führungsrohr 15 ist dabei, wie in Fig. 2 gezeigt, zwischen den Stirnseiten der Friktionswalzen 3 und 4 und den Abzugswalzen 6 vorgesehen, und zwar derart, dass die Symmetrieachse (nicht gezeigt) des Führungsrohres im wesentlichen in einer gedachten Ebene liegt welche die Berührungslinie (nicht gezeigt) der beiden Abzugswalzen 6 und denjenigen Ort an der Friktionsspinntrommel 3 mit einschliesst, an welchem das Garn 5 diese Friktionsspinntrommel verlässt.The guide tube 15 is, as shown in Fig. 2, provided between the end faces of the friction rollers 3 and 4 and the take-off rollers 6, in such a way that the axis of symmetry (not shown) of the guide tube lies essentially in an imaginary plane which is the line of contact (not shown) of the two take-off rolls 6 and also includes the location on the friction spinning drum 3 at which the yarn 5 leaves this friction spinning drum.

Der Innendurchmesser dieses Führungsrohres 15 ist grösser als der Aussendurchmesser des vorgenannten Faserwickels 12, beispielsweise doppelt so gross.The inside diameter of this guide tube 15 is larger than the outside diameter of the aforementioned fiber roll 12, for example twice as large.

Die Austrittsmündung des Führungsrohres 15 kann, wie in Fig. 2 gezeigt, derart mit Ausnehmungen versehen sein, dass die Austrittsmündung der Umfangsfläche der Abzugswalzen 6 angepasst ist.As shown in FIG. 2, the outlet mouth of the guide tube 15 can be provided with recesses such that the outlet mouth is adapted to the peripheral surface of the take-off rollers 6.

Im weiteren kann, wie in Fig. 4 gezeigt, das Führungsrohr als Injektorführungsrohr 15.1 gestaltet werden, indem Einblasöffnungen 16 und 17 vorgesehen werden, welche einem durch diese Öffnungen geführten Luftstrom eine Kraftkomponente in Garnabzugsrichtung Z verleihen. Der genannte Luftstrom wird dabei durch einen im Überdruck stehenden, ringförmigen, um diese Einblasöffnungen 16 und 17 herum vorgesehenen Druckraum 18 erzeugt. Der Druckraum 18 selbst wird über eine Verbindungsbohrung 19 von einem nicht gezeigten Druckluftsystem gespeist, von welchem ein Anschlussrohr 20 das letzte Glied ist. Das Anschlussrohr 20 ist fest mit einem die Druckkammer 18 und die Verbindungsbohrung 19 beinhaltenden Druckgehäuse 21 verbunden.Furthermore, as shown in FIG. 4, the guide tube can be designed as an injector guide tube 15.1 by providing blow-in openings 16 and 17, which give a force component in the yarn withdrawal direction Z to an air stream guided through these openings. The air flow mentioned is generated by a ring-shaped pressure chamber 18, which is under overpressure and is provided around these injection openings 16 and 17. The pressure chamber 18 itself is fed via a connecting bore 19 from a compressed air system, not shown, of which a connecting pipe 20 is the last link. The connecting pipe 20 is fixedly connected to a pressure housing 21 containing the pressure chamber 18 and the connecting bore 19.

Das Druckgehäuse 21 seinerseits dient zur festen Aufnahme des Injektorführungsrohres 15.1 und dichtet den Druckraum 18 gegenüber der Atmosphäre ab.The pressure housing 21, in turn, serves to hold the injector guide tube 15.1 firmly and seals the pressure chamber 18 from the atmosphere.

Das Injektorführungsrohr 15.1 hat deshalb gegenüber dem Führungsrohr 15 den Vorteil, beim Anspinnen den vorgenannten Wickel 12 positiv in den konvergierenden Raum der Abzugswalzen 6 zu fördern.The injector guide tube 15.1 therefore has the advantage over the guide tube 15 of positively conveying the aforementioned winding 12 into the converging space of the take-off rollers 6 when spinning on.

Beim Verlassen der Abzugswalzen 6 wird der Wickel 12, wie in Fig. 6 und 7 gezeigt, von der Saugvorrichtung 13 erfasst und eingesaugt.When leaving the take-off rollers 6, the winding 12, as shown in FIGS. 6 and 7, is gripped and sucked in by the suction device 13.

Das anschliessend ebenfalls eingesaugte Garn 5 (siehe Fig. 7) wird mittels dieser Saugvorrichtung 13 an die weiteren, zur Spinnmaschine (nicht gezeigt) gehörenden, hier jedoch nicht weiter erwähnten Elemente geführt.The yarn 5 which is then also sucked in (see FIG. 7) is guided by means of this suction device 13 to the further elements belonging to the spinning machine (not shown) but not mentioned here.

Sobald der Wickel von der Absaugvorrichtung 13 erfasst wird, werden der Luftstrom im Blaskanal 8 sowie der Luftstrom im Injektorführungsrohr 15.1 unterbrochen.As soon as the winding is detected by the suction device 13, the air flow in the blowing duct 8 and the air flow in the injector guide tube 15.1 are interrupted.

Der vorgenannte Anspinnvorgang kann mit voller Produktionsgeschwindigkeit durchgeführt werden, so dass das von den Abzugswalzen abgelieferte Garn dem zu produzierenden Garn entspricht.The aforementioned piecing process can be carried out at full production speed, so that the yarn delivered by the take-off rollers corresponds to the yarn to be produced.

Es versteht sich, dass das beschriebene Verfahren auch mit Friktionsspinnvorrichtungen durchgeführt werden kann, welche anstelle von Friktionsspinntrommeln eine Friktionsspinnscheibe aufweisen, auf welche die Fasern gefördert werden und von welcher das Garn in einer Garnbildungsstelle gebildet und von dieser durch Abzugswalzen abgezogen wird. Eine solche Vorrichtung ist beispielsweise in der bereits früher erwähnten englischen Patentschrift Nr. 12 318 190 gezeigt und beschrieben.It goes without saying that the described method can also be carried out with friction spinning devices which, instead of friction spinning drums, have a friction spinning disc onto which the fibers are conveyed and from which the yarn is formed in a yarn formation point and is drawn off from it by take-off rollers. Such a device is shown and described for example in the previously mentioned English Patent No. 12 318 190.

Ebenso ist es möglich, anstelle einer Friktionsspinntrommel oder -scheibe ein entsprechend perforiertes Band zu verwenden, auf welches die Fasern an einer senkrecht zur Bandbewegung liegenden Garnbildungsstelle geliefert werden, um dadurch ein Garn zu produzieren.It is also possible to use an appropriately perforated belt instead of a friction spinning drum or disc, on which the fibers are delivered at a yarn formation point perpendicular to the belt movement, in order to thereby produce a yarn.

Eine solche Vorrichtung mit einem genannten Band ist beispielsweise in der französischen Patentanmeldung Nr. 2 480 799 gezeigt.Such a device with said band is shown, for example, in French Patent Application No. 2,480,799.

Im weiteren kann anstelle der Saugvorrichtung 13 auch eine mechanische Aufnahmevorrichtung (nicht gezeigt) verwendet werden. Die Aufnahmevorrichtung muss lediglich in der Lage sein, den Wickel 12 und das darauf folgende Garn 5 mit Produktionsgeschwindigkeit in der genannten Weise aufnehmen zu können.Furthermore, a mechanical holding device (not shown) can also be used instead of the suction device 13. The receiving device only has to be able to receive the winding 12 and the subsequent yarn 5 at the production speed in the manner mentioned.

Ausserdem hat es sich herausgestellt, dass die Wirkung eines vom Blaskanal 8 abgegebenen Luftstromes von vorgebener Intensität, welcher einerseits in der Lage ist, einen Wickel 12 von vorgegebener Grösse zu erfassen und gegen die Abzugswalzen 6 zu fördern, erst dann zum Tragen kommt, wenn der Wickel 12 eine dazu genügende Grösse erreicht hat, wobei diese Grösse empirisch festgestellt werden muss.In addition, it has been found that the effect of an air flow of predetermined intensity emitted by the blow duct 8, which on the one hand is able to grasp a winding 12 of a predetermined size and convey it against the take-off rollers 6, only comes into play when the Winding 12 has reached a sufficient size, this size must be determined empirically.

Daraus kann abgeleitet werden, dass der Luftstrom aus dem Blaskanal 8 auch vor oder gleichzeitig mit dem Fördern von Fasern 11 auf die Friktionsspinntrommel 3 beginnen kann.From this it can be deduced that the air flow from the blowing duct 8 can also begin before or simultaneously with the conveying of fibers 11 onto the friction spinning drum 3.

Im weiteren wurde festgestellt, dass der genannte Luftstrom keinen negativen Einfluss auf das nach dem Anspinnen erzeugte Garn hat.Furthermore, it was found that the air flow mentioned has no negative influence on the yarn produced after piecing.

Dementsprechend kann die Reihenfolge betreffend Beginn der Faserförderung und Einsatz des genannten Luftstromes resp. das Beibehalten oder Ausschalten des Luftstromes nach dem Anspinnen gewählt werden.Accordingly, the order regarding the start of fiber conveyance and use of the airflow mentioned, respectively. Maintaining or switching off the airflow after piecing can be selected.

Vorteilhafterweise wird die Reihenfolge so gewählt, dass zuerst die Fasern 11 angeliefert und der genannte Luftstrom erst nach Erhalt eines Wickels 12 von gewünschter resp. vorgegebener Grösse eingeschaltet wird.Advantageously, the order is chosen so that the fibers 11 are delivered first and the air flow mentioned only after receipt of a roll 12 of the desired or predetermined size is turned on.

Im weiteren kann das Einschalten des Luftstromes vor dem Anliefern der Fasern 11 benutzt werden, um damit die Oberfläche der Friktionsspinntrommel 3 und der Gegenwalze 4 bei Bedarf zu reinigen. Dabei kann dieser reinigende Luftstrom, entsprechend dem früher genannten, wahlweise vor dem Anliefern der Fasern 11 beibehalten oder davor abgestellt werden.Furthermore, the switching on of the air flow can be used before the fibers 11 are delivered in order to clean the surface of the friction spinning drum 3 and the counter roller 4 if necessary. This cleaning air flow, corresponding to the one mentioned earlier, can optionally be maintained before the delivery of the fibers 11 or switched off beforehand.

In Fig. 2 ist mit der strichpunktierten Linie L die mittlere Strömungslinie des im Blaskanal geführten Luftstromes angedeutet und mit dem Winkel a gezeigt, dass diese Strömungslinie L derart geneigt zum Garnende 5.1 steht, dass der genannte Luftstrom dadurch eine gegen das Abzugswalzenpaar 6 gerichtete, auf den Wickel 12 einwirkende Kraftkomponente R erzeugt. Der Winkel a wird dabei mit Vorteil kleiner als 45 Grad aewählt.In Fig. 2, the dash-dotted line L indicates the mean flow line of the air flow guided in the blow duct and shows with the angle a that this flow line L is inclined to the yarn end 5.1 such that the air flow mentioned is directed towards the pair of draw-off rollers 6 the force component R acting on the winding 12 is generated. The angle a is advantageously chosen to be less than 45 degrees.

Claims (10)

1. Method for starting spinning of a yarn (5) in a friction spinning device in which freely floating fibres (11) in a fibre transport passage (2) are delivered to a friction spinning surface of a friction spinning means (3, 4) and are transported on this friction spinning surface to a yarn formation position (7) from which a yarn (5) is withdrawn by yarn withdrawing means (6), characterised in that during start of spinning
a) fibres (11) are transported to the yarn formation position (7) and are twisted to a lap (12) of substantially predetermined size, in that
b) the lap (12) is transported by an air stream towards the yarn withdrawal means (6), and in that
c) thereafter the lap (12), and the yarn (5) adjoining thereon, is gripped by a yarn take-up means following the yarn withdrawing means (6).
2. Method according to claim 1 characterised in that fibres (11) for forming the lap (12) are transported to the yarn formation position (7) only after a predetermined time following generation of the said air stream.
3. Method according to claim 1 characterised in that fibres (11) to form the lap (12) are transported to the yarn formation position (7) simultaneously with generation of the said air stream.
4. Method according to claim 1 characterised in that the said air stream is generated only after a predetermined time following start of transport of fibres (11) to the yarn formation position (7).
5. Method according to claim 2 characterised in that the said air stream is used to clean the friction spinning drums (3, 4) before transport of fibres (11) and preferably is thereafter switched off again.
6. Method according to one of the preceding claims characterised in that in addition to the air stream to transport the lap (12) to the yarn formation position (7), a second air stream is provided to forward the lap (12) between the yarn formation position (7) and the yarn withdrawing means (6), the intensity of the two air streams being preferably adjustable.
7. Method according to one of claims 1 to 4 characterised in that the first air stream is interrupted after the lap (12) has been forwarded to the yarn withdrawal means (6).
8. Method according to claim 6 characterised in that the second air stream is interrupted after the lap has been forwarded to the yarn withdrawal means (6).
9. Method according to one of the preceding claims characterised in that the start of spinning is carried out at the production speed of the friction spinning device.
10. Method according to one of the preceding claims characterised in that the middle flow line (L) is disposed at an angle (a) of less than 45° to the yarn end (5.1) so that this air stream exerts a component of force which urges the lap (12) towards the yarn withdrawing means.
EP86112564A 1985-10-31 1986-09-11 Method for piecing a yarn in a friction-spinning device Expired EP0222101B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86112564T ATE42777T1 (en) 1985-10-31 1986-09-11 METHOD OF PATCHING A YARN ON A FRICTION SPINNING DEVICE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH468585 1985-10-31
CH4685/85 1985-10-31

Publications (2)

Publication Number Publication Date
EP0222101A1 EP0222101A1 (en) 1987-05-20
EP0222101B1 true EP0222101B1 (en) 1989-05-03

Family

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Family Applications (1)

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EP86112564A Expired EP0222101B1 (en) 1985-10-31 1986-09-11 Method for piecing a yarn in a friction-spinning device

Country Status (6)

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US (1) US4680924A (en)
EP (1) EP0222101B1 (en)
JP (1) JPS62104931A (en)
AT (1) ATE42777T1 (en)
DE (1) DE3663156D1 (en)
IN (1) IN168013B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IN165873B (en) * 1984-10-15 1990-02-03 Rieter Ag Maschf
IN171023B (en) * 1987-04-29 1992-07-04 Rieter Ag Maschf
US4918913A (en) * 1987-06-12 1990-04-24 Maschinenfabrik Rieter Ag Method of, and device for, performing a start spinning operation for spinning of a yarn in a friction spinning apparatus
US5802826A (en) * 1993-08-06 1998-09-08 The United States Of America As Represented By The Secretary Of Agriculture Production of core/wrap yarns by airjet and friction spinning in tandem
CN109576832B (en) * 2018-12-21 2023-06-20 武汉纺织大学 Centrifugal-friction spinning device and yarn manufacturing method using same

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4070811A (en) * 1974-09-24 1978-01-31 Ernst Fehrer Machine for spinning textile fibers
EP0034427B2 (en) * 1980-02-16 1989-05-17 Hollingsworth (U.K.) Limited Apparatus and method of open-end spinning yarn
IN161964B (en) * 1982-10-29 1988-03-05 Rieter Ag Maschf
DE3308250A1 (en) * 1983-03-09 1984-09-13 Stahlecker, Fritz, 7347 Bad Überkingen OE FRICTION SPIDER
DE3318687C2 (en) * 1983-05-21 1995-07-06 Schlafhorst & Co W Method and device for starting up a friction spinning unit
CH663428A5 (en) * 1983-05-21 1987-12-15 Schlafhorst & Co W METHOD AND DEVICE FOR STARTING UP A FRICTION SPINDING MACHINE.
DE3320768A1 (en) * 1983-06-09 1984-12-13 Fritz 7347 Bad Überkingen Stahlecker DEVICE FOR OE-FRICTION SPINNING
DE3325928A1 (en) * 1983-07-19 1985-01-31 Fritz 7347 Bad Überkingen Stahlecker METHOD AND DEVICE FOR SPINNING A YARN ON A SPINNING UNIT OF AN OE-FRICTION SPINNING MACHINE
AT383377B (en) * 1984-01-19 1987-06-25 Fehrer Textilmasch METHOD FOR TENSIONING A YARN IN A FRICTION SPINNING DEVICE
DE3410471A1 (en) * 1984-03-22 1985-09-26 Fritz 7347 Bad Überkingen Stahlecker OE FRICTION SPINNING MACHINE WITH A VARIETY OF SPINNING UNITS AND A MOVABLE MAINTENANCE DEVICE
DE3428890A1 (en) * 1984-08-04 1986-02-13 Schubert & Salzer Maschinenfabrik Ag, 8070 Ingolstadt METHOD AND DEVICE FOR REPANCHING AN OPEN-END FRICTION SPIDER DEVICE
DE3432622A1 (en) * 1984-09-05 1986-03-13 Fritz 7347 Bad Überkingen Stahlecker DEVICE FOR OE-FRICTION SPINNING

Also Published As

Publication number Publication date
IN168013B (en) 1991-01-19
US4680924A (en) 1987-07-21
DE3663156D1 (en) 1989-06-08
JPS62104931A (en) 1987-05-15
EP0222101A1 (en) 1987-05-20
ATE42777T1 (en) 1989-05-15

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