EP2267200B1 - Procedure for operating a workstation and workstation of an open ended rotor spinning machine - Google Patents

Procedure for operating a workstation and workstation of an open ended rotor spinning machine Download PDF

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Publication number
EP2267200B1
EP2267200B1 EP20100005340 EP10005340A EP2267200B1 EP 2267200 B1 EP2267200 B1 EP 2267200B1 EP 20100005340 EP20100005340 EP 20100005340 EP 10005340 A EP10005340 A EP 10005340A EP 2267200 B1 EP2267200 B1 EP 2267200B1
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Prior art keywords
spinning
thread
speed
spinning rotor
rotor
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EP20100005340
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German (de)
French (fr)
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EP2267200A1 (en
Inventor
Omar Abu Mohamed Abu-Amna
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Oerlikon Textile GmbH and Co KG
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Oerlikon Textile GmbH and Co KG
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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
    • D01H4/50—Piecing arrangements; Control therefor for rotor spinning

Definitions

  • the invention relates to a method for operating a workstation of an open-end rotor spinning machine and a workstation with control means for performing the method, wherein accelerated after a cheese / empty tube change the spinning rotor, fed to the spinning rotor a sliver via a feed roller, at a predetermined piecing speed an auxiliary thread in fed to the spinning rotor, the auxiliary thread connected to the spun yarn by a piecing, started the thread withdrawal, disposed of the auxiliary thread and then the spun yarn is fixed to the empty tube.
  • the DE-A1-10 2007 056561 shows a method for operating a job, wherein accelerated after a cheese change of the spinning rotor.
  • the DE 101 39 072 A1 describes a device for re-spinning at jobs of an open-end rotor spinning machine, each having a spinning device and a winding device, with an auxiliary thread supplying device for providing a necessary after a cheese / empty tube change for re-spinning auxiliary thread and a thread laying device for fixing a new strand to a held in a creel of the winder empty tube.
  • the fixing is carried out by pinching the thread between the empty tube and arranged on the coil frame sleeve plate.
  • the prepared yarn end of the auxiliary thread kept ready by the piecing elements of the work station is first fed briefly into the rotating spinning rotor. Then the auxiliary thread, which is then connected via a so-called piecing with the new spun yarn is disposed of by a thread take-off device and a suction nozzle immediately. This disposal continues until the piecer passes a sensor device and is disconnected. If the piecer is separated, the actual application of the spun yarn to the empty tube and the winding of a thread reserve on the empty tube takes place. That is, there are now immediately behind each other some rapid movements of the handling devices of the yarn laying device. During this process, the thread comes to a stop on the sleeve plate. Since the spinning device simultaneously produces continuous filament, this filament is temporarily stored in a storage nozzle.
  • the operating speeds of the spinning rotors and the associated yarn take-off speeds are increasing with the progressive development of the rotor spinning machines and the increasing productivity requirements.
  • the thread end to be applied to the empty tube comes to a standstill during application, while the thread withdrawal device continuously withdraws the strand from the spinning rotor rotating at its operating speed.
  • the yarn length produced during the application process becomes larger and larger with increasing operating speed of the spinning rotor, but the above-mentioned storage nozzle can only absorb a limited thread length. For this reason, the application process must be performed faster and faster, and the drives of the winding shaft and the thread guide on the winding device of the job must be taken as sudden as possible after setting the spin path. The sudden start can lead to errors in the function.
  • a misalignment of the thread guide may occur, resulting in an intolerable offset on the spool. But above all, it may happen that due to the high process dynamics of the Filament is not securely clamped between the empty tube and the tube plate. This leads to production stoppages and thus reduces the productivity of the spinning machine in an undesirable manner.
  • the length of the spun yarn produced during the application process can be limited so that it can be taken up by known yarn storage devices and yet sufficient time is available for a secure application of the spun yarn.
  • the operating speed that is, the rotational speed of the spinning rotor in normal spinning operation, can be selected so that the required productivity is achieved.
  • the acceleration of the spinning rotor and according to the yarn withdrawal and the feed roller for carrying out the setting of the spun yarn is reduced to the empty tube after production of the piecing. In this way it can be ensured that until the disposal of the auxiliary thread and the piecing the spinning rotor has not already reached its operating speed.
  • the acceleration of the spinning rotor is reduced to such an extent that the spinning rotor rotates at a constant speed.
  • the acceleration of the spinning rotor is reduced so much that the spinning rotor is decelerated.
  • the spinning rotor can first be accelerated to the production of a piecing to the required piecing speed. Subsequently, the speed is reduced so much that the fixing of the spun yarn to the empty tube can be done safely.
  • the spinning rotor is accelerated to its operating speed after fixing the spun yarn to the empty tube.
  • the acceleration of the spinning rotor and according to the thread take-off and the feed roller is initially reduced after preparation of the piecing, the acceleration of the spinning rotor is increased again, then the strand is fixed to the empty tube and the spinning rotor is further accelerated to its operating speed.
  • the acceleration of the spinning rotor In a change in the acceleration of the spinning rotor not only the acceleration of the thread take-off must be changed at the same time, but also the supply of the sliver. Due to the scope of the opening roller can despite a corresponding Speed or acceleration adjustment of the feed roller in an abrupt acceleration change, the feeding speed of the sliver are not synchronized synchronously with the rotor speed.
  • the occurring time offset is also referred to as fiber fly time. For this reason, there may be a thin spot in the spun yarn. If the acceleration is increased again and then the filament is applied to the empty tube, the thin point can be removed before applying.
  • a workstation of an open-end rotor spinning machine with control means for carrying out the method according to the invention wherein handling means are provided to apply the drawn from a spinning rotor filament to an empty tube after a cheese / empty tube change, wherein the spinning rotor has a drive and a thread take-off for pulling off the spinning thread and a feed roll, via which a fiber strand is supplied to the spinning rotor, and wherein the drive of the spinning rotor, the thread suit, the feed roller and the handling means are controllable by the control means that the fixing of the spun yarn the empty tube at a rotational speed of the spinning rotor below the operating speed at which rotates the spinning rotor in the normal spinning operation and at a yarn withdrawal speed below the yarn withdrawal speed in the normal spinning operation and a korrespondi to it erenden speed of the feed roller, takes place.
  • Fig. 1 one half of a per se known open-end rotor spinning machine is indicated and marked with 1.
  • Such spinning machines have a plurality of jobs 2, which are each equipped with a spinning device 3 and a winding device 4.
  • the sliver 5 presented in sliver cans 6 is spun into threads 7, which are wound on the winding devices 4 to cheeses 8.
  • the spinning devices 3 have for this purpose a driven by a drive 27 rotating spinning rotor 26.
  • the sliver 6 is fed to the spinning rotor 26 via a feed roller 25.
  • the winding devices 4 are each provided with a coil frame 9 for rotatably supporting an empty tube 10, or a cross-wound bobbin 8 and a winding drum 11 for driving the cross-wound bobbin.
  • the workstations 2 each have a Fadenchangier gifted 18, a workstation own suction nozzle 14 and the workstation's own Anspinnorgane 20. That is, the jobs 2 are equipped so that they can fix thread breaks automatically.
  • the open-end spinning machine 1 also has a bobbin transport device 12 for disposing of the cheeses 8 finished on the winding devices 4.
  • a service unit 16 On or on the spinning machine 1, on a guide rail 13 and a support rail 15 movable, a service unit 16 is arranged.
  • the drive of this service unit 16 consists of rollers 17 and support wheels 19.
  • the supply of the service unit 16 with electrical energy and compressed air is preferably carried out via a drag chain.
  • Such service units 16 constantly patrol along the open-end spinning machine 1 and engage automatically when a need for action arises at one of the workstations 2. Such a need for action exists, for example, if at one of the workstations 2 a full cross-wound bobbin has to be exchanged for a new empty tube and then re-spun again.
  • the service unit 16 has for this purpose, as is known, numerous handling devices that allow a proper cheese / Leerhülsencic. Of these numerous handling devices are in the drawings, for better clarity, only a so-called thread supply tube 22 with its connected Auxiliary thread supply device 21 and the thread laying device 23 according to the invention. With the help of the handling devices, the service unit of the workstation can provide an auxiliary thread 24.
  • the thread laying device 23 consists essentially of a support arm 39, which is also mounted in an intermediate wall of the service unit 16.
  • the support arm 39 which has a head end element 40 at its end, is mounted with limited pivoting relative to its pivot axis 42 as well as axially displaceable.
  • a Fadenanlegerkopf is articulated movably on the head element 40 via a pivot axis, which carries various functional elements, such as thread cutting device 31, guide roller 33 and yarn brake 35.
  • the workstations 2 each have a control device 45, which monitors and controls the processes at the workstation 2.
  • the control device 45 is connected via control lines 48 to the handling devices of the workstation.
  • the control devices 45 of the workstations 2 are connected to a machine-wide bus system 47, via which the control devices 45 communicate with a (not shown) central control unit and the control device 46 of the service unit 16.
  • the control device 46 is in turn connected via the control lines 49 to the handling devices of the service unit 16 and thus controls together with control devices 45 of the workstation the operations of re-spinning described below and the application of the thread to the empty tube.
  • the piecing has passed, the actual application of the spun yarn 7 to the empty tube 10 and the winding of the thread reserve on the empty tube 10 takes place.
  • the new filament 7 is cut by the thread cutting device 31 just above the empty tube 10 and simultaneously clamped by the thread brake 35, which is positioned below the empty tube 10.
  • the trimmed, still on the thread withdrawal device 28 running thread piece is disposed of via the suction nozzle 14.
  • Thread separation is closed by pivoting the head element 40 of the sleeve plate 30 and the spun yarn 7 securely clamped between the empty tube 10 and the sleeve plate 30.
  • the thread cutting device 31 and the thread brake 35 are opened.
  • the filament 7 is positioned in front of the so-called Fadenreserverille the empty tube 10. Subsequently, the winding drum 11 is started and accelerates the over-friction resting empty tube 10 to winding speed.
  • the yarn brake 35 is closed.
  • the remaining turns of the thread reserve are wound up with increased thread tension and offset by a few millimeters outwards, so that the thread beginning is wrapped and thus securely fixed.
  • the Fig. 2 shows a curve N of the rotational speed n of the spinning rotor 26 and the course V of the thread withdrawal speed v over the time t, as is known in the prior art.
  • the spinning rotor 26 is used to make a piecer between the auxiliary thread 24 and the new spun yarn 7 is initially accelerated until it reaches its piecing speed n A at the time t A.
  • the piecing is produced and the thread withdrawal device 54 starts its work and pulls the spun yarn 7 from the spinning rotor 26 with the yarn withdrawal speed v corresponding to the rotational speed n of the spinning rotor 26.
  • the feed roller 25 leads with appropriate speed to the sliver 6.
  • the spinning rotor 26 is continuously accelerated until it has its operating speed n B and the yarn take-off its associated yarn withdrawal speed V B reached at time t B. Only then is the application process described above of the spun yarn 7 carried out on the empty tube 10.
  • the Figures 3 and 4 show time courses according to the present invention.
  • the Fig. 3 represents a possible time course N 1 of the rotational speed n of the spinning rotor 26 and the associated course V 1 of the yarn withdrawal speed v.
  • the spinning rotor 26 is first accelerated to the piecing speed n A and at time t A a piecing produced and the thread take-off device in progress set. Shortly thereafter at the time t 1 , the acceleration process of the spinning rotor is interrupted.
  • the speed n for setting the spun yarn 7 on the empty tube 10 is kept constant at the value n L1 , so that the application process can be carried out at a reduced take-off speed v L1 .
  • the application process is completed and the yarn is transferred to the Fadenchangier Anlagen 18, so that the spinning rotor is accelerated again until the time t B 'the operating speed n B and the associated yarn withdrawal speed v B is reached.
  • the application process can also be performed only at the time t L2 .
  • the rotational speed of the spinning rotor 26 is then kept constant according to the embodiment described above until the time t 2 . Until then, the thread and the piecemeal are removed. The spinning rotor 26 and the thread take-off 54 are accelerated again from the time t 2 .
  • the thin spot in the spun yarn 7, which arises due to the delayed tracking of the sliver 6 is removed and at time t L2 is applied at the rotor speed n L2 and the yarn withdrawal speed v L2 of the spun yarn to the empty tube.
  • the spinning rotor 26 then moves with unchanged acceleration up to its operating speed n B.
  • the Fig. 4 shows further variants of the present invention.
  • possible courses N 1 , N 2 , N 3 of the rotational speed n of the spinning rotor 26 are shown over the time t.
  • the acceleration of the spinning rotor 26 is reduced at the time t 1 .
  • the spinning rotor is further accelerated despite the reduction.
  • the reduction may be sufficient to allow for secure application.
  • the course N 1 corresponds to that of Fig. 3 , The speed is initially constant after time t 1 here. If the acceleration is reduced even further, you get the course N 3 . The acceleration then becomes negative and the speed decreases.

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

Description

Die Erfindung betrifft ein Verfahren zum Betreiben einer Arbeitsstelle einer Offenend-Rotorspinnmaschine und eine Arbeitsstelle mit Steuermitteln zur Durchführung des Verfahrens, wobei nach einem Kreuzspulen-/Leerhülsenwechsel der Spinnrotor beschleunigt, über eine Einspeisewalze dem Spinnrotor ein Faserband zugeführt, bei einer vorgegebenen Anspinndrehzahl ein Hilfsfaden in den Spinnrotor eingespeist, der Hilfsfaden mit dem Spinnfaden durch einen Anspinner verbunden, der Fadenabzug gestartet, der Hilfsfaden entsorgt und danach der Spinnfaden an der Leerhülse festgelegt wird.The invention relates to a method for operating a workstation of an open-end rotor spinning machine and a workstation with control means for performing the method, wherein accelerated after a cheese / empty tube change the spinning rotor, fed to the spinning rotor a sliver via a feed roller, at a predetermined piecing speed an auxiliary thread in fed to the spinning rotor, the auxiliary thread connected to the spun yarn by a piecing, started the thread withdrawal, disposed of the auxiliary thread and then the spun yarn is fixed to the empty tube.

Die DE-A1-10 2007 056561 zeigt ein Verfahren zum Betreiben einer Arbeitsstelle, wobei nach einem Kreuzspulenwechsel der Spinnrotor beschleunigt.The DE-A1-10 2007 056561 shows a method for operating a job, wherein accelerated after a cheese change of the spinning rotor.

Die DE 101 39 072 A1 beschreibt eine Vorrichtung zum Wiederanspinnen an Arbeitsstellen einer Offenend-Rotorspinnmaschine, die jeweils eine Spinnvorrichtung und eine Spulvorrichtung aufweisen, mit einer Hilfsfaden-Liefereinrichtung zum Bereitstellen eines nach einem Kreuzspulen-/Leerhülsenwechsel für das Wiederanspinnen benötigten Hilfsfaden sowie einer Fadenverlegevorrichtung zum Festlegen eines neuen Spinnfadens an einer in einem Spulenrahmen der Spulvorrichtung gehaltenen Leerhülse. Das Festlegen erfolgt dabei durch Einklemmen des Fadens zwischen der Leerhülse und einem am Spulenrahmen angeordneten Hülsenteller.The DE 101 39 072 A1 describes a device for re-spinning at jobs of an open-end rotor spinning machine, each having a spinning device and a winding device, with an auxiliary thread supplying device for providing a necessary after a cheese / empty tube change for re-spinning auxiliary thread and a thread laying device for fixing a new strand to a held in a creel of the winder empty tube. The fixing is carried out by pinching the thread between the empty tube and arranged on the coil frame sleeve plate.

Zum Wiederanspinnen wird das vorbereitete, durch die Anspinnorgane der Arbeitsstelle bereitgehaltene Fadenende des Hilfsfadens zunächst kurz in den rotierenden Spinnrotor eingespeist. Anschließend wird der Hilfsfaden, der dann über einen sogenannten Anspinner mit dem neuen Spinnfaden verbunden ist, durch eine Fadenabzugseinrichtung und eine Saugdüse sofort entsorgt. Diese Entsorgung läuft so lange, bis der Anspinner eine Sensoreinrichtung passiert und abgetrennt wird. Wenn der Anspinner abgetrennt ist, erfolgt das eigentliche Anlegen des Spinnfadens an der Leerhülse sowie das Wickeln einer Fadenreserve auf die Leerhülse. Das heißt, es erfolgen nun unmittelbar hintereinander einige schnelle Bewegungen der Handhabungseinrichtungen der Fadenverlegevorrichtung. Während dieses Vorganges kommt der Faden am Hülsenteller zum Stillstand. Da die Spinnvorrichtung gleichzeitig kontinuierlich Spinnfaden produziert, wird dieser Spinnfaden kurzzeitig in einer Speicherdüse zwischengespeichert.For re-spinning, the prepared yarn end of the auxiliary thread kept ready by the piecing elements of the work station is first fed briefly into the rotating spinning rotor. Then the auxiliary thread, which is then connected via a so-called piecing with the new spun yarn is disposed of by a thread take-off device and a suction nozzle immediately. This disposal continues until the piecer passes a sensor device and is disconnected. If the piecer is separated, the actual application of the spun yarn to the empty tube and the winding of a thread reserve on the empty tube takes place. That is, there are now immediately behind each other some rapid movements of the handling devices of the yarn laying device. During this process, the thread comes to a stop on the sleeve plate. Since the spinning device simultaneously produces continuous filament, this filament is temporarily stored in a storage nozzle.

Die Betriebsdrehzahlen der Spinnrotoren und die dazugehörigen Fadenabzugsgeschwindigkeiten werden mit der fortschreitenden Entwicklung der Rotorspinnmaschinen und den zunehmenden Produktivitätsanforderungen immer größer. Wie bereits erläutert, kommt das an der Leerhülse anzulegende Fadenende während des Anlegens zum Stillstand, während die Fadenabzugseinrichtung kontinuierlich den Spinnfaden aus dem mit seiner Betriebsdrehzahl drehenden Spinnrotor abzieht. Die während des Anlegeprozesses produzierte Fadenlänge wird mit zunehmender Betriebsdrehzahl des Spinnrotors immer größer, die oben erwähnte Speicherdüse kann jedoch nur eine begrenzte Fadenlänge aufnehmen. Aus diesem Grunde muss auch der Anlegeprozess immer schneller durchgeführt werden, und die Antriebe der Wickelwelle und des Fadenführers an der Spuleinrichtung der Arbeitsstelle müssen nach dem Festlegen des Spinnfades möglichst sprunghaft in Betrieb genommen werden. Durch das sprunghafte Anfahren kann es zu Fehlern der Funktion kommen. Zum Beispiel kann ein fehlerhafter Versatz des Fadenführers auftreten, was zu einem nicht tolerierbaren Absatz auf der Spule führt. Aber vor allen kann es vorkommen, dass aufgrund der hohen Prozessdynamik der Spinnfaden nicht sicher zwischen der Leerhülse und dem Hülsenteller eingeklemmt wird. Dies führt zu Produktionsunterbrechungen und setzt damit die Produktivität der Spinnmaschine in unerwünschter Weise herab.The operating speeds of the spinning rotors and the associated yarn take-off speeds are increasing with the progressive development of the rotor spinning machines and the increasing productivity requirements. As already explained, the thread end to be applied to the empty tube comes to a standstill during application, while the thread withdrawal device continuously withdraws the strand from the spinning rotor rotating at its operating speed. The yarn length produced during the application process becomes larger and larger with increasing operating speed of the spinning rotor, but the above-mentioned storage nozzle can only absorb a limited thread length. For this reason, the application process must be performed faster and faster, and the drives of the winding shaft and the thread guide on the winding device of the job must be taken as sudden as possible after setting the spin path. The sudden start can lead to errors in the function. For example, a misalignment of the thread guide may occur, resulting in an intolerable offset on the spool. But above all, it may happen that due to the high process dynamics of the Filament is not securely clamped between the empty tube and the tube plate. This leads to production stoppages and thus reduces the productivity of the spinning machine in an undesirable manner.

Es ist daher die Aufgabe der vorliegenden Erfindung, ein sicheres Festlegen eines aus einem Spinnrotor abgezogenen Spinnfadens an eine Leerhülse zu ermöglichen und trotzdem eine hohe Produktivität der Spinnmaschine zu erreichen.It is therefore an object of the present invention to enable a secure setting of a withdrawn from a spinning rotor spun yarn to an empty tube and still achieve high productivity of the spinning machine.

Die Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Verfahrensanspruches 1 sowie des Vorrichtungsanspruches 7 gelöst. Vorteilhafte Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche.The object is achieved by the characterizing features of the method claim 1 and the device claim 7. Advantageous developments of the invention are the subject of the dependent claims.

Zur Lösung der Aufgabe wird vorgeschlagen, dass das Festlegen des Spinnfadens an der Leerhülse bei einer Drehzahl des Spinnrotors unterhalb seiner Betriebsdrehzahl, mit der der Spinnrotor im normalen Spinnbetrieb rotiert, und bei einer Fadenabzugsgeschwindigkeit unterhalb der Fadenabzugsgeschwindigkeit im normalen Spinnbetrieb sowie einer dazu korrespondierenden Drehzahl der Einspeisewalze (25) durchgeführt wird.To solve the problem it is proposed that the setting of the spun yarn to the empty tube at a rotational speed of the spinning rotor below its operating speed, with the spinning rotor rotates in normal spinning operation, and at a thread take-off speed below the thread take-off speed in normal spinning operation and a corresponding speed of the feed roller (25).

Auf diese Weise kann die während des Anlegeprozesses produzierte Länge des Spinnfadens so begrenzt werden, dass sie von bekannten Fadenspeichereinrichtungen aufgenommen werden kann und dennoch ausreichend Zeit für ein sicheres Anlegen des Spinnfades zur Verfügung steht. Gleichzeitig kann die Betriebsdrehzahl, das heißt, die Drehzahl des Spinnrotors im normalen Spinnbetrieb, so gewählt werden, dass die geforderte Produktivität erreicht wird. Gemäß einer Weiterbildung der Erfindung wird nach Herstellung des Anspinners die Beschleunigung des Spinnrotors und entsprechend des Fadenabzugs und der Einspeisewalze zur Durchführung des Festlegens des Spinnfadens an der Leerhülse reduziert. Auf diese Weise kann sichergestellt werden, dass bis zur Entsorgung des Hilfsfadens und des Anspinners der Spinnrotor nicht bereits seine Betriebsdrehzahl erreicht hat.In this way, the length of the spun yarn produced during the application process can be limited so that it can be taken up by known yarn storage devices and yet sufficient time is available for a secure application of the spun yarn. At the same time, the operating speed, that is, the rotational speed of the spinning rotor in normal spinning operation, can be selected so that the required productivity is achieved. According to one embodiment of the invention, the acceleration of the spinning rotor and according to the yarn withdrawal and the feed roller for carrying out the setting of the spun yarn is reduced to the empty tube after production of the piecing. In this way it can be ensured that until the disposal of the auxiliary thread and the piecing the spinning rotor has not already reached its operating speed.

Gemäß einer bevorzugten Ausführungsform wird die Beschleunigung des Spinnrotors soweit reduziert, dass der Spinnrotor mit konstanter Drehzahl rotiert.According to a preferred embodiment, the acceleration of the spinning rotor is reduced to such an extent that the spinning rotor rotates at a constant speed.

Gemäß einer anderen bevorzugten Ausführungsform wird die Beschleunigung des Spinnrotors soweit reduziert, dass der Spinnrotor verzögert wird. So kann der Spinnrotor zunächst zur Herstellung eines Anspinners bis auf die erforderliche Anspinndrehzahl beschleunigt werden. Anschließend wird die Drehzahl soweit reduziert, dass das Festlegen des Spinnfadens an der Leerhülse sicher erfolgen kann.According to another preferred embodiment, the acceleration of the spinning rotor is reduced so much that the spinning rotor is decelerated. Thus, the spinning rotor can first be accelerated to the production of a piecing to the required piecing speed. Subsequently, the speed is reduced so much that the fixing of the spun yarn to the empty tube can be done safely.

Vorzugsweise wird der Spinnrotor nach Festlegen des Spinnfadens an der Leerhülse auf seine Betriebsdrehzahl beschleunigt.Preferably, the spinning rotor is accelerated to its operating speed after fixing the spun yarn to the empty tube.

Gemäß einer anderen Ausführungsform wird nach Herstellung des Anspinners die Beschleunigung des Spinnrotors und entsprechend des Fadenabzugs und der Einspeisewalze zunächst reduziert, die Beschleunigung des Spinnrotors wird wieder erhöht, dann wird der Spinnfaden an der Leerhülse festgelegt und der Spinnrotor wird weiter auf seine Betriebsdrehzahl beschleunigt. Bei einer Änderung der Beschleunigung des Spinnrotors muss nicht nur gleichzeitig die Beschleunigung des Fadenabzugs geändert werden, sondern auch die Zufuhr des Faserbandes. Aufgrund des Umfangs der Auflösewalze kann trotz einer entsprechenden Geschwindigkeits- beziehungsweise Beschleunigungsanpassung der Einspeisewalze bei einer abrupten Beschleunigungsänderung die Zuführgeschwindigkeit des Faserbandes nicht synchron der Rotordrehzahl nachgeführt werden. Der dabei auftretende Zeitversatz wird auch als Faserflugzeit bezeichnet. Aus diesem Grund kann es in dem Spinnfaden zu einer Dünnstelle kommen. Wenn die Beschleunigung erst wieder erhöht wird und dann der Spinnfaden an der Leerhülse angelegt wird, kann vor dem Anlegen die Dünnstelle entfernt werden.According to another embodiment, the acceleration of the spinning rotor and according to the thread take-off and the feed roller is initially reduced after preparation of the piecing, the acceleration of the spinning rotor is increased again, then the strand is fixed to the empty tube and the spinning rotor is further accelerated to its operating speed. In a change in the acceleration of the spinning rotor not only the acceleration of the thread take-off must be changed at the same time, but also the supply of the sliver. Due to the scope of the opening roller can despite a corresponding Speed or acceleration adjustment of the feed roller in an abrupt acceleration change, the feeding speed of the sliver are not synchronized synchronously with the rotor speed. The occurring time offset is also referred to as fiber fly time. For this reason, there may be a thin spot in the spun yarn. If the acceleration is increased again and then the filament is applied to the empty tube, the thin point can be removed before applying.

Zur Lösung der Aufgabe wird ferner eine Arbeitsstelle einer Offenend-Rotorspinnmaschine mit Steuermitteln zur Durchführung des erfindungsgemäßen Verfahrens vorgeschlagen, wobei Handhabungseinrichtungen vorhanden sind, um nach einem Kreuzspulen-/Leerhülsenwechsel den aus einem Spinnrotor abgezogenen Spinnfaden an eine Leerhülse anzulegen, wobei der Spinnrotor einen Antrieb aufweist und ein Fadenabzug zum Abziehen des Spinnfades sowie eine Einspeisewalze, über die ein Faserverband dem Spinnrotor zuführbar ist, vorhanden ist und wobei der Antrieb des Spinnrotors, der Fadenanzug, die Einspeisewalze und die Handhabungseinrichtungen mittels der Steuermittel so ansteuerbar sind, dass das Festlegen des Spinnfadens an der Leerhülse bei einer Drehzahl des Spinnrotors unterhalb der Betriebsdrehzahl, mit der der Spinnrotor im normalen Spinnbetrieb rotiert und bei einer Fadenabzugsgeschwindigkeit unterhalb der Fadenabzugsgeschwindigkeit im normalen Spinnbetrieb sowie einer dazu korrespondierenden Drehzahl der Einspeisewalze, erfolgt.In order to achieve the object, a workstation of an open-end rotor spinning machine with control means for carrying out the method according to the invention is also proposed, wherein handling means are provided to apply the drawn from a spinning rotor filament to an empty tube after a cheese / empty tube change, wherein the spinning rotor has a drive and a thread take-off for pulling off the spinning thread and a feed roll, via which a fiber strand is supplied to the spinning rotor, and wherein the drive of the spinning rotor, the thread suit, the feed roller and the handling means are controllable by the control means that the fixing of the spun yarn the empty tube at a rotational speed of the spinning rotor below the operating speed at which rotates the spinning rotor in the normal spinning operation and at a yarn withdrawal speed below the yarn withdrawal speed in the normal spinning operation and a korrespondi to it erenden speed of the feed roller, takes place.

Die Erfindung wird nachfolgend anhand eines in den Zeichnungen dargestellten Ausführungsbeispiels näher erläutert.The invention will be explained in more detail with reference to an embodiment shown in the drawings.

Es zeigen:

Fig. 1
schematisch eine Hälfte einer Offenend- Rotorspinnmaschine mit einem Serviceaggregat zum Festlegen eines Spinnfadens an eine Leerhülse;
Fig. 2
Diagramm mit einem zeitlichen Verlauf der Drehzahl des Spinnrotors und der Fadenabzugsgeschwindigkeit beim Festlegen des Spinnfadens an der Leerhülse gemäß dem Stand der Technik;
Fig. 3
Diagramm mit einem zeitlichen Verlauf der Drehzahl des Spinnrotors und der Fadenabzugsgeschwindigkeit beim Festlegen des Spinnfadens an der Leerhülse gemäß der vorliegenden Erfindung;
Fig. 4
Diagramm mit weiteren zeitlichen Verläufen der Drehzahl des Spinnrotors beim Festlegen des Spinnfadens an der Leerhülse gemäß der vorliegenden Erfindung.
Show it:
Fig. 1
schematically one half of an open-end rotor spinning machine with a service unit for fixing a spun yarn to an empty tube;
Fig. 2
Diagram with a time profile of the speed of the spinning rotor and the thread withdrawal speed when fixing the spun yarn to the empty tube according to the prior art;
Fig. 3
Diagram with a time profile of the speed of the spinning rotor and the thread withdrawal speed when setting the spun yarn to the empty tube according to the present invention;
Fig. 4
Diagram with further time courses of the rotational speed of the spinning rotor when setting the spun yarn on the empty tube according to the present invention.

In Fig. 1 ist eine Hälfte einer an sich bekannten Offenend-Rotorspinnmaschine angedeutet und mit 1 gekennzeichnet. Derartige Spinnmaschinen weisen eine Vielzahl von Arbeitsstellen 2 auf, die jeweils mit einer Spinnvorrichtung 3 sowie einer Spuleinrichtung 4 ausgerüstet sind.In Fig. 1 one half of a per se known open-end rotor spinning machine is indicated and marked with 1. Such spinning machines have a plurality of jobs 2, which are each equipped with a spinning device 3 and a winding device 4.

In den Spinnvorrichtungen 3 wird das in Spinnkannen 5 vorgelegte Faserband 6 zu Fäden 7 gesponnen, die auf den Spuleinrichtungen 4 zu Kreuzspulen 8 aufgewickelt werden. Die Spinnvorrichtungen 3 weisen dazu einen von einem Antrieb 27 angetriebenen rotierenden Spinnrotor 26 auf. Das Faserband 6 wird dem Spinnrotor 26 über eine Einspeisewalze 25 zugeführt. Wie angedeutet, sind die Spuleinrichtungen 4 jeweils mit einem Spulenrahmen 9 zum drehbaren Haltern einer Leerhülse 10, beziehungsweise einer Kreuzspule 8 und einer Spultrommel 11 zum Antreiben der Kreuzspule ausgestattet.In the spinning devices 3, the sliver 5 presented in sliver cans 6 is spun into threads 7, which are wound on the winding devices 4 to cheeses 8. The spinning devices 3 have for this purpose a driven by a drive 27 rotating spinning rotor 26. The sliver 6 is fed to the spinning rotor 26 via a feed roller 25. As indicated, the winding devices 4 are each provided with a coil frame 9 for rotatably supporting an empty tube 10, or a cross-wound bobbin 8 and a winding drum 11 for driving the cross-wound bobbin.

Des Weiteren verfügen die Arbeitsstellen 2 jeweils über eine Fadenchangiereinrichtung 18, eine arbeitsstelleneigene Saugdüse 14 sowie arbeitsstelleneigene Anspinnorgane 20. Das heißt, die Arbeitsstellen 2 sind so ausgerüstet, dass sie Fadenbrüche selbsttätig beheben können.Furthermore, the workstations 2 each have a Fadenchangiereinrichtung 18, a workstation own suction nozzle 14 and the workstation's own Anspinnorgane 20. That is, the jobs 2 are equipped so that they can fix thread breaks automatically.

Die Offenend-Spinnmaschine 1 weist außerdem eine Spulentransporteinrichtung 12 zum Entsorgen der auf den Spuleinrichtungen 4 fertig gestellten Kreuzspulen 8 auf.The open-end spinning machine 1 also has a bobbin transport device 12 for disposing of the cheeses 8 finished on the winding devices 4.

An beziehungsweise auf der Spinnmaschine 1 ist, an einer Führungsschiene 13 sowie einer Stützschiene 15 verfahrbar, ein Serviceaggregat 16 angeordnet. Das Laufwerk dieses Serviceaggregates 16 besteht aus Laufrollen 17 beziehungsweise Stützrädern 19. Die Versorgung des Serviceaggregates 16 mit elektrischer Energie und Druckluft erfolgt vorzugsweise über eine Schleppkette. Derartige Serviceaggregate 16 patrouillieren ständig entlang der Offenend-Spinnmaschine 1 und greifen selbsttätig ein, wenn an einer der Arbeitsstellen 2 ein Handlungsbedarf entsteht. Ein solcher Handlungsbedarf liegt beispielsweise vor, wenn an einer der Arbeitsstellen 2 eine volle Kreuzspule gegen eine neue Leerhülse getauscht und anschließend wieder neu angesponnen werden muss.On or on the spinning machine 1, on a guide rail 13 and a support rail 15 movable, a service unit 16 is arranged. The drive of this service unit 16 consists of rollers 17 and support wheels 19. The supply of the service unit 16 with electrical energy and compressed air is preferably carried out via a drag chain. Such service units 16 constantly patrol along the open-end spinning machine 1 and engage automatically when a need for action arises at one of the workstations 2. Such a need for action exists, for example, if at one of the workstations 2 a full cross-wound bobbin has to be exchanged for a new empty tube and then re-spun again.

Das Serviceaggregat 16 verfügt zu diesem Zweck, wie bekannt, über zahlreiche Handhabungseinrichtungen, die einen ordnungsgemäßen Kreuzspulen-/Leerhülsenwechsel ermöglichen. Von diesen zahlreichen Handhabungseinrichtungen sind in den Zeichnungen, der besseren Übersichtlichkeit halber, lediglich ein sogenanntes Fadenlieferrohr 22 mit seiner angeschlossenen Hilfsfadenliefereinrichtung 21 sowie die erfindungsgemäße Fadenverlegeeinrichtung 23 dargestellt. Mit der Hilfe der Handhabungseinrichtungen kann das Serviceaggregat der Arbeitstelle einen Hilfsfaden 24 zur Verfügung stellen.The service unit 16 has for this purpose, as is known, numerous handling devices that allow a proper cheese / Leerhülsenwechsel. Of these numerous handling devices are in the drawings, for better clarity, only a so-called thread supply tube 22 with its connected Auxiliary thread supply device 21 and the thread laying device 23 according to the invention. With the help of the handling devices, the service unit of the workstation can provide an auxiliary thread 24.

Die Fadenverlegeeinrichtung 23 besteht im Wesentlichen aus einem Tragarm 39, der ebenfalls in einer Zwischenwandung des Serviceaggregates 16 gelagert ist. Der Tragarm 39, der endseitig ein Kopfelement 40 aufweist, ist dabei bezüglich seiner Schwenkachse 42 sowohl begrenzt drehbar als auch axial verschiebbar gelagert. Am Kopfelement 40 ist dabei ein Hülsentelleröffner 32 sowie eine federbeaufschlagte Fadenführungseinrichtung festgelegt. Außerdem ist am Kopfelement 40 über eine Schwenkachse ein Fadenanlegerkopf beweglich angelenkt, der verschiedene Funktionselemente, wie Fadenschneideinrichtung 31, Umlenkrolle 33 sowie Fadenbremse 35 trägt.The thread laying device 23 consists essentially of a support arm 39, which is also mounted in an intermediate wall of the service unit 16. The support arm 39, which has a head end element 40 at its end, is mounted with limited pivoting relative to its pivot axis 42 as well as axially displaceable. At the head element 40 while a Hülsentelleröffner 32 and a spring-loaded thread guide device is set. In addition, a Fadenanlegerkopf is articulated movably on the head element 40 via a pivot axis, which carries various functional elements, such as thread cutting device 31, guide roller 33 and yarn brake 35.

Die Arbeitsstellen 2 weisen jeweils eine Steuereinrichtung 45 auf, die die Abläufe an der Arbeitsstelle 2 überwacht und steuert. Die Steuereinrichtung 45 ist dazu über Steuerleitungen 48 mit den Handhabungseinrichtungen der Arbeitstelle verbunden. Ferner sind die Steuereinrichtungen 45 der Arbeitsstellen 2 an ein maschinenweites Bussystem 47 angeschlossen, über das die Steuereinrichtungen 45 mit einer (nicht dargestellten) Zentralsteuereinheit und der Steuereinrichtung 46 des Serviceaggregats 16 kommunizieren. Die Steuereinrichtung 46 ist ihrerseits über die Steuerleitungen 49 mit den Handhabungseinrichtungen des Serviceaggregats 16 verbunden und steuert so gemeinsam mit Steuereinrichtungen 45 der Arbeitsstelle die im folgenden beschriebenen Abläufe des Wiederanspinnens und des Anlegens des Fadens an der Leerhülse. Zum Wiederanspinnen der Spinnvorrichtung 3 wird das vorbereitete durch die Anspinnorgane 20 der Arbeitsstelle 2 bereitgehaltene Fadenende des Hilfsfadens 24, wie bekannt, zunächst kurz in die Spinnvorrichtung 3 zurückgespeist. Anschließend wird der Hilfsfaden 24, der dann über einen sogenannten Anspinner mit dem neuen Spinnfaden 7 verbunden ist, über die in Fig.1 angedeutete Fadenabzugseinrichtung 54 der Arbeitsstelle 2 sowie die etwa synchron laufende Fadenabzugseinrichtung 28 des Serviceaggregates 16 abgezogen und durch die Saugdüse 14 der Arbeitsstelle 2 sofort entsorgt. Diese Entsorgung läuft so lange, bis der Anspinner eine (nicht dargestellte) Sensoreinrichtung passiert. Wenn der Anspinner durchgelaufen ist, erfolgt das eigentliche Anlegen des Spinnfadens 7 an der Leerhülse 10 sowie das Wickeln der Fadenreserve auf die Leerhülse 10.The workstations 2 each have a control device 45, which monitors and controls the processes at the workstation 2. The control device 45 is connected via control lines 48 to the handling devices of the workstation. Furthermore, the control devices 45 of the workstations 2 are connected to a machine-wide bus system 47, via which the control devices 45 communicate with a (not shown) central control unit and the control device 46 of the service unit 16. The control device 46 is in turn connected via the control lines 49 to the handling devices of the service unit 16 and thus controls together with control devices 45 of the workstation the operations of re-spinning described below and the application of the thread to the empty tube. For re-spinning the spinning device 3, the prepared prepared by the Anspinnorgane 20 of the job 2 yarn end of the auxiliary thread 24, as known, initially fed back briefly into the spinning device 3. Subsequently, the auxiliary thread 24, which is then connected via a so-called piecemeal with the new spun yarn 7, on the in Fig.1 indicated thread withdrawal device 54 of the work station 2 and the approximately synchronously running thread withdrawal device 28 of the service unit 16 withdrawn and disposed of by the suction nozzle 14 of the job 2 immediately. This disposal continues until the piecer passes a sensor device (not shown). When the piecing has passed, the actual application of the spun yarn 7 to the empty tube 10 and the winding of the thread reserve on the empty tube 10 takes place.

Das heißt, es erfolgen nun unmittelbar hintereinander einige schnelle Bewegungen der Handhabungseinrichtungen. Während dieser Zeit kommt der Faden am Hülsenteller 30 kurz zum Stillstand. Da die Spinnvorrichtung gleichzeitig kontinuierlich Spinnfaden 7 produziert, wird dieser Spinnfaden kurzzeitig in einer Speicherdüse 55 der Arbeitsstelle 2 zwischengespeichert.That is, there are now immediately behind each other some rapid movements of handling equipment. During this time, the thread comes on the sleeve plate 30 briefly to a standstill. Since the spinning device simultaneously produces continuous filament 7, this filament is temporarily stored temporarily in a storage nozzle 55 of the job 2.

Im Einzelnen ergibt sich insbesondere für das Klemmen des neuen Spinnfadens 7 zwischen Hülsenteller 30 und Leerhülse 10 sowie die Erstellung der Fadenreserve auf der Leerhülse 10 folgender Verfahrensablauf:Specifically, in particular for the clamping of the new spun yarn 7 between sleeve plate 30 and empty tube 10 and the creation of the thread reserve on the empty tube 10 results in the following procedure:

Der neue Spinnfaden 7 wird durch die Fadenschneideinrichtung 31 kurz oberhalb der Leerhülse 10 geschnitten und gleichzeitig von der Fadenbremse 35, die unterhalb der Leerhülse 10 positioniert ist, geklemmt. Das abgeschnittene, noch über die Fadenabzugseinrichtung 28 laufende Fadenstück wird über die Saugdüse 14 entsorgt. Unmittelbar nach oder gleichzeitig mit der Fadentrennung wird durch Schwenken des Kopfelementes 40 der Hülsenteller 30 geschlossen und der Spinnfaden 7 zwischen Leerhülse 10 und dem Hülsenteller 30 sicher geklemmt.The new filament 7 is cut by the thread cutting device 31 just above the empty tube 10 and simultaneously clamped by the thread brake 35, which is positioned below the empty tube 10. The trimmed, still on the thread withdrawal device 28 running thread piece is disposed of via the suction nozzle 14. Immediately after or simultaneously with the Thread separation is closed by pivoting the head element 40 of the sleeve plate 30 and the spun yarn 7 securely clamped between the empty tube 10 and the sleeve plate 30.

Durch entsprechende Ansteuerung werden dann die Fadenschneideinrichtung 31 sowie die Fadenbremse 35 geöffnet. Der Spinnfaden 7 wird dabei vor der sogenannten Fadenreserverille der Leerhülse 10 positioniert. Anschließend wird die Spultrommel 11 gestartet und beschleunigt die über Reibschluß aufliegende Leerhülse 10 auf Wickelgeschwindigkeit.By appropriate control then the thread cutting device 31 and the thread brake 35 are opened. The filament 7 is positioned in front of the so-called Fadenreserverille the empty tube 10. Subsequently, the winding drum 11 is started and accelerates the over-friction resting empty tube 10 to winding speed.

Nach einer bestimmten Anzahl Hülsendrehungen, zum Beispiel drei Umdrehungen, wird die Fadenbremse 35 geschlossen.After a certain number of sleeve rotations, for example three revolutions, the yarn brake 35 is closed.

Das heißt, die restlichen Windungen der Fadenreserve werden mit erhöhter Fadenspannung und um einige Millimeter nach außen versetzt aufgewunden, so dass der Fadenanfang überwickelt und damit sicher fixiert wird.That is, the remaining turns of the thread reserve are wound up with increased thread tension and offset by a few millimeters outwards, so that the thread beginning is wrapped and thus securely fixed.

Nach Fertigstellung der Fadenreservewicklung wird durch Zurückschwenken der Fadenverlegeeinrichtung 23 der Spinnfaden 7 freigegeben und kann von der Fadenchangiereinrichtung 18 der Arbeitsstelle 2 übernommen werden. Die Fadenübergabe erfolgt dabei definiert durch entsprechendes Ansteuern eines Zentrierbleches in Abhängigkeit von der Position des Fadenführers der Fadenchangiereinrichtung 18.After completion of the Fadenreservewicklung 23 of the spinning yarn 7 is released by pivoting back the yarn laying device and can be taken over by the Fadenchangiereinrichtung 18 of the job 2. The thread transfer takes place here defined by appropriate driving of a centering plate in dependence on the position of the thread guide of the thread switching device 18th

Das Wiederanspinnen und Anlegen des Spinnfadens 7 an der Leerhülse 10 ist an sich bekannt und ist in der eingangs zitierten DE 101 39 072 A1 noch genauer beschrieben.The re-spinning and applying the spun yarn 7 to the empty tube 10 is known per se and is quoted in the opening paragraph DE 101 39 072 A1 described in more detail.

Die Fig. 2 zeigt einen Verlauf N der Drehzahl n des Spinnrotors 26 und den Verlauf V der Fadenabzugsgeschwindigkeit v über die Zeit t, wie er gemäß dem Stand der Technik bekannt ist. Der Spinnrotor 26 wird zur Herstellung eines Anspinners zwischen dem Hilfsfaden 24 und dem neuen Spinnfaden 7 zunächst beschleunigt, bis er zum Zeitpunkt tA seine Anspinndrehzahl nA erreicht hat. Zu diesem Zeitpunkt tA wird der Anspinner hergestellt und die Fadenabzugseinrichtung 54 nimmt ihre Arbeit auf und zieht den Spinnfaden 7 mit der zu der Drehzahl n des Spinnrotors 26 korrespondierenden Fadenabzugsgeschwindigkeit v aus dem Spinnrotor 26 ab. Die Einspeisewalze 25 führt mit entsprechender Geschwindigkeit das Faserband 6 zu. Der Spinnrotor 26 wird kontinuierlich weiter beschleunigt, bis er zum Zeitpunkt tB seine Betriebsdrehzahl nB und der Fadenabzug seine zugehörige Fadenabzugsgeschwindigkeit VB erreicht hat. Erst dann wird der oben beschriebene Anlegeprozess des Spinnfadens 7 an der Leerhülse 10 durchgeführt.The Fig. 2 shows a curve N of the rotational speed n of the spinning rotor 26 and the course V of the thread withdrawal speed v over the time t, as is known in the prior art. The spinning rotor 26 is used to make a piecer between the auxiliary thread 24 and the new spun yarn 7 is initially accelerated until it reaches its piecing speed n A at the time t A. At this time t A , the piecing is produced and the thread withdrawal device 54 starts its work and pulls the spun yarn 7 from the spinning rotor 26 with the yarn withdrawal speed v corresponding to the rotational speed n of the spinning rotor 26. The feed roller 25 leads with appropriate speed to the sliver 6. The spinning rotor 26 is continuously accelerated until it has its operating speed n B and the yarn take-off its associated yarn withdrawal speed V B reached at time t B. Only then is the application process described above of the spun yarn 7 carried out on the empty tube 10.

Die Figuren 3 und 4 zeigen Zeitverläufe gemäß der vorliegenden Erfindung. Die Fig. 3 stellt einen möglichen Zeitverlauf N1 der Drehzahl n des Spinnrotors 26 und den dazugehörigen Verlauf V1 der Fadenabzugsgeschwindigkeit v dar. Wie bekannt, wird zunächst der Spinnrotor 26 auf die Anspinndrehzahl nA beschleunigt und zum Zeitpunkt tA ein Anspinner hergestellt und die Fadenabzugseinrichtung in Gang gesetzt. Kurz darauf zum Zeitpunkt t1 wird der Beschleunigungsvorgang des Spinnrotors unterbrochen. In dem in Fig. 3 dargestellten Ausführungsbeispiel wird die Drehzahl n für das Festlegen des Spinnfadens 7 an der Leerhülse 10 auf den Wert nL1 konstant gehalten, so dass der Anlegeprozess bei einer reduzierten Abzugsgeschwindigkeit vL1 durchgeführt werden kann. Bis zum Zeitpunkt tL1 ist der Hilfsfaden 24 und der Anspinner entsorgt und das Festlegen des Spinnfadens 7 an der Leerhülse 10 kann durchgeführt werden. Zum Zeitpunkt t2 ist der Anlegevorgang abgeschlossen und der Faden wird an die Fadenchangiereinrichtung 18 übergeben, so dass der Spinnrotor wieder beschleunigt wird, bis zum Zeitpunkt tB' die Betriebsdrehzahl nB und die zugehörige Fadenabzugsgeschwindigkeit vB erreicht ist. Alternativ kann der Anlegevorgang auch erst zum Zeitpunkt tL2 durchgeführt werden. Die Drehzahl des Spinnrotors 26 wird dann entsprechend der oben beschriebenen Ausführung bis zum Zeitpunkt t2 konstant gehalten. Bis dahin sind der Hilfsfaden und der Anspinner entfernt. Der Spinnrotor 26 und der Fadenabzug 54 werden ab dem Zeitpunkt t2 wieder beschleunigt. Die Dünnstelle im Spinnfaden 7, die aufgrund der verzögerten Nachführung des Faserbandes 6 entsteht, wird entfernt und zum Zeitpunkt tL2 wird bei der Rotordrehzahl nL2 und der Fadenabzugsgeschwindigkeit vL2 der Spinnfaden an die Leerhülse angelegt. In dem dargestellten Ausführungsbeispiel fährt dann der Spinnrotor 26 mit unveränderter Beschleunigung bis zu seiner Betriebsdrehzahl nB hoch.The Figures 3 and 4 show time courses according to the present invention. The Fig. 3 represents a possible time course N 1 of the rotational speed n of the spinning rotor 26 and the associated course V 1 of the yarn withdrawal speed v. As is known, the spinning rotor 26 is first accelerated to the piecing speed n A and at time t A a piecing produced and the thread take-off device in progress set. Shortly thereafter at the time t 1 , the acceleration process of the spinning rotor is interrupted. In the in Fig. 3 In the embodiment shown, the speed n for setting the spun yarn 7 on the empty tube 10 is kept constant at the value n L1 , so that the application process can be carried out at a reduced take-off speed v L1 . Until the time t L1 of the auxiliary thread 24 and the piecing is disposed of and the fixing of the spun yarn 7 to the empty tube 10 can be performed. At time t 2 , the application process is completed and the yarn is transferred to the Fadenchangiereinrichtung 18, so that the spinning rotor is accelerated again until the time t B 'the operating speed n B and the associated yarn withdrawal speed v B is reached. Alternatively, the application process can also be performed only at the time t L2 . The rotational speed of the spinning rotor 26 is then kept constant according to the embodiment described above until the time t 2 . Until then, the thread and the piecemeal are removed. The spinning rotor 26 and the thread take-off 54 are accelerated again from the time t 2 . The thin spot in the spun yarn 7, which arises due to the delayed tracking of the sliver 6 is removed and at time t L2 is applied at the rotor speed n L2 and the yarn withdrawal speed v L2 of the spun yarn to the empty tube. In the illustrated embodiment, the spinning rotor 26 then moves with unchanged acceleration up to its operating speed n B.

Die Fig. 4 zeigt weitere Varianten der vorliegenden Erfindung. In dem Diagramm sind mögliche Verläufe N1, N2, N3 der Drehzahl n des Spinnrotors 26 über die Zeit t dargestellt. Nach dem Anspinnen zum Zeitpunkt tA wird zum Zeitpunkt t1 die Beschleunigung des Spinnrotors 26 reduziert. Bei dem Verlauf N2 wird der Spinnrotor trotz der Reduzierung weiter beschleunigt. Die Reduzierung kann jedoch ausreichen, um ein sicheres Anlegen zu ermöglichen. Der Verlauf N1 entspricht dem der Fig. 3. Die Drehzahl ist hier nach dem Zeitpunkt t1 zunächst konstant. Wenn die Beschleunigung noch weiter reduziert wird, erhält man den Verlauf N3. Die Beschleunigung wird dann negativ und die Drehzahl nimmt ab. Zum Zeitpunkt t2 ist der Anlegevorgang abgeschlossen, und die Beschleunigung nimmt in allen drei Fällen wieder ihren ursprünglichen Wert an und der Spinnrotor 26 wird bis zur Betriebsdrehzahl nB beschleunigt. Die Verläufe der Drehzahl n des Spinnrotors 26 beziehungsweise die dazugehörigen Verläufe der Fadenabzugsgeschwindigkeit v sind in den Zeichnungen abschnittsweise linear dargestellt. Dies stellt jedoch keine Einschränkung dar. Zur Realisierung der Erfindung sind auch andere Verläufe möglich.The Fig. 4 shows further variants of the present invention. In the diagram, possible courses N 1 , N 2 , N 3 of the rotational speed n of the spinning rotor 26 are shown over the time t. After piecing at the time t A , the acceleration of the spinning rotor 26 is reduced at the time t 1 . In the course N 2 , the spinning rotor is further accelerated despite the reduction. However, the reduction may be sufficient to allow for secure application. The course N 1 corresponds to that of Fig. 3 , The speed is initially constant after time t 1 here. If the acceleration is reduced even further, you get the course N 3 . The acceleration then becomes negative and the speed decreases. At time t 2 , the application process is completed, and the acceleration returns to its original value in all three cases, and the spinning rotor 26 is accelerated up to the operating speed n B. The curves of the rotational speed n of the spinning rotor 26 and the associated courses of the yarn withdrawal speed v are shown in sections in the drawings in a linear manner. However, this does not matter Restriction. For the realization of the invention, other courses are possible.

Claims (7)

  1. Method for operating a workstation (2) of an open-end rotor spinning machine (1), wherein, after a cross-wound bobbin/empty tube change, the spinning rotor (26) is accelerated, a fibre band (6) is fed by a feed roller (25) to the spinning rotor, at a predetermined piecing speed (nA) an auxiliary thread (24) is fed into the spinning rotor (26), the auxiliary thread (24) is connected to the spinning thread (7) by a piecer, the thread draw-off mechanism (54) is started, the auxiliary thread (24) is disposed of and, thereafter, the spinning thread (7) is secured to the empty tube (10),
    characterised in that
    the spinning thread (7) is secured to the empty tube (10) at a speed (nL1, nL2) of the spinning rotor (26) below its operating speed (nB), at which the spinning rotor (26) rotates during normal spinning operation, and at a thread draw-off speed (vL1, vL2) below the thread draw-off speed (vB) during normal spinning operation and a speed corresponding thereto of the feed roller (25).
  2. Method according to claim 1, characterised in that after production of the piecer the acceleration of the spinning rotor (26) and correspondingly of the thread draw-off mechanism (54) and the feed roller (25) is reduced to carry out the securing of the spinning thread (7) to the empty tube (10).
  3. Method according to claim 2, characterised in that the acceleration of the spinning rotor (26) is reduced to such an extent that the spinning rotor (26) rotates at a constant speed (nL1).
  4. Method according to claim 2, characterised in that the acceleration of the spinning rotor (26) is reduced to such an extent that the spinning rotor (26) is decelerated.
  5. Method according to any one of claims 2 to 4, characterised in that the spinning rotor (26) is accelerated to its operating speed (nB) after the securing of the spinning thread (7) on the empty tube (10).
  6. Method according to claim 1, characterised in that after the production of the piecer, the acceleration of the spinning rotor (26) and correspondingly of the thread draw-off mechanism (54) and the feed roller (25) is firstly reduced and in that the acceleration of the spinning rotor (26) is then increased again, the spinning thread (7) is secured to the empty tube (10) and the spinning rotor (26) is accelerated further to its operating speed (nB).
  7. Workstation (2) of an open-end rotor spinning machine (1) with control means (45, 46) for carrying out the method according to any one of claims 1 to 6, wherein handling mechanisms are present in order, after a cross-wound bobbin/empty tube change, to attach the spinning thread (7) drawn off from a spinning rotor (26) on an empty tube (10), the spinning rotor (26) has a drive (27), and a thread draw-off mechanism (54) is provided for drawing off the spinning thread (7) and a feed roller (25), by means of which a fibre band (6) can be fed to the spinning rotor (26), characterised in that the drive (27) of the spinning rotor (26), the thread draw-off mechanism (54), the feed roller (25) and the handling mechanisms can be activated by means of the control means (45, 46) in such a way that the spinning thread (7) is secured to the empty tube (10) at a speed (nL1, nL2) of the spinning rotor (26) below the operating speed (nB), at which the spinning rotor (26) rotates during normal spinning operation, and at a thread draw-off speed (vL1, vL2) below the thread draw-off speed (vB) during normal spinning operation and a speed corresponding with this of the feed roller (25).
EP20100005340 2009-06-26 2010-05-21 Procedure for operating a workstation and workstation of an open ended rotor spinning machine Active EP2267200B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910030677 DE102009030677A1 (en) 2009-06-26 2009-06-26 Method for operating a workstation and workstation of an open-end rotor spinning machine

Related Parent Applications (1)

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DE102009030677 Previously-Filed-Application 2009-06-26

Publications (2)

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EP2267200A1 EP2267200A1 (en) 2010-12-29
EP2267200B1 true EP2267200B1 (en) 2012-08-29

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EP20100005340 Active EP2267200B1 (en) 2009-06-26 2010-05-21 Procedure for operating a workstation and workstation of an open ended rotor spinning machine

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EP (1) EP2267200B1 (en)
CN (1) CN101935897B (en)
BR (1) BRPI1002046A2 (en)
DE (1) DE102009030677A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019116671A1 (en) * 2019-06-19 2020-12-24 Maschinenfabrik Rieter Ag Spinning machine and method for operating a spinning station of a spinning machine
DE102019129499A1 (en) * 2019-10-31 2021-05-06 Saurer Spinning Solutions Gmbh & Co. Kg Open-end spinning machine and method and control device for operating such an open-end spinning machine

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4432702B4 (en) * 1994-09-14 2005-08-18 Saurer Gmbh & Co. Kg Service device for a cheese-producing textile machine
DE10139072B4 (en) 2001-08-09 2009-12-17 Oerlikon Textile Gmbh & Co. Kg Service unit for re-spinning jobs of an open-end spinning machine
DE10327370A1 (en) * 2003-06-18 2005-01-13 Rieter Ingolstadt Spinnereimaschinenbau Ag Preparing settings for spinning initiation in open-ended spinning machine, provides calculation formulae, prior values and data related to specific spinning conditions
DE102004029048A1 (en) * 2004-06-14 2005-12-29 Wilhelm Stahlecker Gmbh Semi-automatic method of joining-on, preparatory to spinning in open-ended rotor spinning machine, brakes manually to reduce speed before joining-on automatically
DE102005033562A1 (en) * 2005-07-19 2007-01-25 Saurer Gmbh & Co. Kg Method for operating an open-end spinning device
CZ304396B6 (en) * 2006-05-26 2014-04-16 Rieter Cz S.R.O. Method of individual yarn spinning on rotor spinning machine workstation and apparatus for making the same
DE102007038871B4 (en) * 2006-08-18 2022-02-17 Rieter Ingolstadt Gmbh Process for piecing on textile machines with a plurality of spinning positions
DE102007056561A1 (en) * 2007-08-25 2009-02-26 Oerlikon Textile Gmbh & Co. Kg Textile machine cross-winding thread onto spools, employs data transmission system to change workstation spinning- and spinning-on parameters during spool replacement

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Publication number Publication date
CN101935897B (en) 2015-02-11
DE102009030677A1 (en) 2010-12-30
EP2267200A1 (en) 2010-12-29
CN101935897A (en) 2011-01-05
BRPI1002046A2 (en) 2011-07-05

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