EP3153612B1 - Method for preparing a yarn end for spinning on a rotor spinning device of a rotor spinning machine and rotor spinning machine - Google Patents

Method for preparing a yarn end for spinning on a rotor spinning device of a rotor spinning machine and rotor spinning machine Download PDF

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Publication number
EP3153612B1
EP3153612B1 EP16192712.4A EP16192712A EP3153612B1 EP 3153612 B1 EP3153612 B1 EP 3153612B1 EP 16192712 A EP16192712 A EP 16192712A EP 3153612 B1 EP3153612 B1 EP 3153612B1
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EP
European Patent Office
Prior art keywords
rotor
spinning
yarn end
yarn
negative pressure
Prior art date
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Application number
EP16192712.4A
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German (de)
French (fr)
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EP3153612A1 (en
Inventor
Frank Baier
Jiri Sloupensky
Milos Ferkl
Jiri Kutlvasr
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Rieter Ingolstadt GmbH
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Rieter Ingolstadt GmbH
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Publication of EP3153612A1 publication Critical patent/EP3153612A1/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
    • D01H4/50—Piecing arrangements; Control therefor for rotor spinning
    • 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
    • D01H4/04—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 imparting twist by contact of fibres with a running surface
    • D01H4/08—Rotor spinning, i.e. the running surface being provided by a rotor
    • 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

Definitions

  • the present invention relates to a method for preparing a yarn end for spinning on a rotor spinning device of a rotor spinning machine, wherein the rotor spinning machine comprises a rotor housing which can be closed with a lid and can be acted upon by a negative pressure via a negative pressure channel, a rotor housing which is rotatably mounted in the rotor housing and rotates at an operating speed during spinning operation Has spinning rotor and a trigger nozzle.
  • the yarn end to be prepared is introduced into the vacuum channel of the rotor spinning device and interrupted by a separating structure of the open edge of the rotating spinning rotor, and is thus prepared for piecing.
  • the invention relates to a corresponding rotor spinning machine with at least one such rotor spinning device.
  • a yarn end In order to be able to start the spinning process when spinning on a rotor spinning machine or to be able to restart the spinning process after an interruption of the spinning process, for example due to a broken thread, a quality cut or after the rotor spinning machine has been shut down, a yarn end must always be prepared for the piecing process. For this it is necessary to unravel the end of the yarn in order to align the individual fibers of the end of the yarn for the piecing process and to remove short fibers. The yarn end prepared for piecing must then be fed back into the spinning rotor with a length that is as precisely dimensioned as possible in order to be able to reconnect with the fiber material stored there.
  • the yarn end by means of the edge area of the rotating spinning rotor.
  • the yarn is brought near the open edge of the spinning rotor with the rotor housing at least partially open.
  • the spinning rotor is now rotated and the lid of the rotor housing is closed, so that the yarn end is now pressed against the open edge of the rotor and severed.
  • the edge of the spinning rotor is provided with a roughening or an abrasive.
  • the yarn is introduced into the closed rotor housing, a single driven rotor being displaced in its axial direction.
  • the rotor After inserting the yarn end, the rotor is again shifted back into its operating position and set in rotation, so that the yarn end is interrupted by the rotor running up.
  • the object of the present invention is therefore to propose a method for yarn end preparation and a corresponding rotor spinning machine, by means of which a good and uniform yarn end preparation can be achieved even in various applications.
  • the yarn end to be prepared is introduced into the vacuum channel of the rotor spinning device and interrupted by a separating structure of the open edge of the rotating spinning rotor and is thereby prepared for piecing.
  • the spinning rotor is driven at a defined yarn preparation speed during the interruption of the yarn end.
  • the yarn end preparation speed is either equal to the operating speed of the spinning rotor or less than the operating speed of the spinning rotor.
  • the yarn ends are always interrupted under the same conditions at a defined separation speed, so that the yarn ends are prepared and fibered with a largely constant yarn end length even in various applications.
  • the drive of the spinning rotor at a yarn end preparation speed that is reduced compared to the operating speed also results in a very gentle severing of the yarn end, which is thereby fiberized very uniformly. Due to the uniform, reproducible good resolution of the yarn ends, the success rate of the piecing process can be increased, so that the overall machine utilization effect also increases.
  • the optimally prepared yarn end also makes it a good and reproducible one Maintain the piecing quality so that the yarn quality as a whole can be improved.
  • a rotor spinning machine with at least one rotor spinning device with a rotor housing which can be closed with a cover and can be acted upon by a vacuum via a vacuum channel, with a spinning rotor rotatably mounted in the rotor housing and with a draw-off nozzle, an edge of the spinning rotor being a separating structure for interrupting and preparing a vacuum channel introduced thread end for piecing, includes a corresponding control unit for performing the method for thread end preparation. By means of the control unit it is possible to drive the spinning rotor at a defined yarn end preparation speed which is lower than the operating speed of the spinning rotor during the interruption of the yarn end.
  • the yarn preparation speed is less than 80%, preferably less than 65% and particularly preferably less than 55% of the operating speed and is preferably less than a spinning speed of the spinning rotor. This prevents the yarn end from being cut too quickly, at which adequate fraying cannot be achieved.
  • safety aspects can also be taken into account in particular with a yarn end preparation speed of less than 55% of the operating speed if the yarn end preparation is carried out with the rotor housing partially open.
  • the cover of the rotor housing is transferred to an intermediate position, in particular a half-open position, before the yarn end is introduced into the vacuum channel, and the yarn end to be prepared is inserted into the vacuum channel with the spinning rotor and half-open rotor housing stationary. Then the spinning rotor is rotated and driven at the yarn end preparation speed for the predetermined period of time, whereby the yarn is interrupted. Only after the yarn end has been interrupted is the lid finally moved into a closed position.
  • the cover of the rotor housing can be brought at least into a closed position, an open position and an intermediate position, in particular a semi-open position, or can be transferred back and forth between these positions.
  • the yarn end prepared for piecing is already returned to the fiber collecting groove of the spinning rotor by closing the cover or moving the cover from the intermediate position into the closed position.
  • the spinning rotor is further driven for the yarn end preparation in each case for a predetermined period of time at the defined yarn end preparation speed.
  • the predetermined period of time is determined in such a way that, on the one hand, a reliable severing of the thread end can be assumed within this period and, on the other hand, the piecing process can be continued quickly so as not to adversely affect the machine use effect.
  • the predetermined time period is set as a function of a type of yarn produced and / or a type of spinning rotor.
  • devices involved in the yarn production at least one feeding device and one winding device, are braked to a standstill in such a controlled manner that the yarn end, after the controlled braking, within the rotor spinning device, especially located inside the trigger nozzle.
  • a planned interruption of the spinning operation it is thus possible to avoid running the end of the yarn onto the bobbin with the following complex thread searches.
  • the controlled shutdown of the rotor spinning device is particularly advantageous in connection with the yarn end preparation through the open edge of the spinning rotor, since the yarn remains completely in its regular thread path and can be sucked into the vacuum channel directly from its end position within the rotor spinning device or within the draw-off nozzle, which is what continues to contribute to an increase in the machine utilization effect.
  • An advantageous further development of the method provides that after the controlled braking, the yarn end is unwound from a spool against its regular withdrawal direction, inserted into the vacuum channel of the rotor spinning device and rewound until a defective yarn piece is completely sucked into the vacuum channel, and then the yarn end is prepared for piecing.
  • the defective piece of yarn can thus be sucked in, separated and disposed of directly through the vacuum channel.
  • the yarn end preparation for re-spinning can already take place.
  • the winding device and the take-off device are advantageously driven counter to their regular direction of rotation, the take-off device being driven at a higher speed than the winding device.
  • the height of the speed relates to the peripheral speed of the take-off device or the winding device and thus to the speed at which the yarn is transported. Due to the faster drive of the take-off device, the yarn to be spooled is subjected to a tensioning delay, which prevents the yarn from sticking to the spool and any back loops caused thereby. It is there with a rotor spinning machine advantageous if the winding device for rewinding is provided with a soft start control.
  • the spinning rotor is first brought from its operating speed to a braking speed which is lower than the operating speed and is driven for a predetermined period of time at the braking speed. Only then is the spinning rotor braked to a standstill. A regular yarn can thus also be produced during the controlled braking or at least the length of a faulty yarn piece produced during the controlled braking can be reduced. It is particularly advantageous if the braking speed is the same as or less than the spinning speed of the spinning rotor, since this essentially results in the same operating conditions as during spinning.
  • the spinning rotor is subjected to cleaning, in particular pneumatic cleaning. It is advantageous here that the spinning rotor can also be cleaned in the intermediate position and thus time can be saved, which in turn benefits the machine utilization effect. In addition to pneumatic cleaning, mechanical cleaning using a brush or a scraper is of course also possible.
  • the vacuum level in the vacuum channel is adjustable.
  • the vacuum level can thus be adapted to the type of yarn produced. For example, in the case of yarns that are more difficult to suck in, the vacuum level can be increased.
  • the vacuum level in the vacuum channel is at least briefly increased before the yarn end is inserted into the vacuum channel.
  • the insertion of the yarn end into the vacuum channel can be facilitated in this way.
  • the yarn end is preferably moved in an oscillating manner in its longitudinal direction during its interruption by means of a take-off device of the rotor spinning device.
  • the length of the prepared yarn end can also be adjusted by moving the yarn end.
  • the yarn end is fixed in the spinning device, in particular in the draw-off nozzle, by means of a draw-off tube or a clamping device when the rotor spinning device is at a standstill.
  • the rotor spinning device preferably has, based on the regular draw-off direction of the yarn, a draw-off tube arranged downstream of the draw-off nozzle and / or a clamping device arranged downstream of the draw-off nozzle. Slipping of the yarn end out of the rotor spinning device can thus be avoided even when the spinning device is turned off and the vacuum is not effective.
  • a cover element is arranged on the rotor housing, which at least partially covers a gap between the rotor housing and the cover in the intermediate position of the cover. This makes it possible to maintain a vacuum level in the rotor housing even when the cover is partially open.
  • the spinning rotor of the rotor spinning device is provided with teeth or knurling in at least a partial area of its edge, preferably in two mutually opposite partial areas of its edge. Because only small subareas of the edge are provided with the separating structure, any negative influences of the separating structure on the spinning result and on the energy requirement of the spinning rotor can be largely avoided.
  • the inlet area of the vacuum channel is provided with at least one wear protection device, in particular a wear protection ring. Traces of wear from the action of the sucked-in yarn end can thereby be avoided.
  • FIG. 1 shows a rotor spinning device 2 of a rotor spinning machine 1 in a schematic sectional view.
  • the rotor spinning device 2 has in the usual way a rotor housing 3, in which a spinning rotor 5 is rotatably mounted and rotates at an operating speed during the operation of the rotor spinning device 2.
  • a fiber material F to be spun is fed to the spinning rotor 5 via a feed device 12 and a dissolving device 21, where it is dissolved in individual fibers, and is deposited in a fiber collecting groove 6 of the spinning rotor 5 in the form of a fiber ring. From there it is integrated into the end of the yarn G produced in the rotor spinning device 2.
  • the yarn produced in the spinning rotor 5 is drawn off in a known manner via a take-off nozzle 7 by means of a take-off device 11, which in the present case is formed by two take-off rollers, and is wound onto a spool 14 by means of a winding device 13.
  • the rotor housing 3 is connected via a vacuum channel 8 to a central vacuum channel 22 of the rotor spinning machine 1 and is thereby subjected to a spinning vacuum.
  • the rotor housing 3 is closed by means of a cover 4 during the spinning operation.
  • the discharge nozzle 7 and, according to the present illustration, also a discharge tube 16 are arranged.
  • the draw-off tube 16 is, however, not absolutely necessary; likewise, instead of the draw-off tube 16, only a swirl stowage element can also be provided, which can also be formed in one piece with the draw-off nozzle 7.
  • the draw-off tube 16 is, however, advantageous in order to fix the yarn G when the spinning operation is interrupted within the rotor spinning device 2, as will be explained in the following.
  • the cover 4 of the rotor housing 3 Part of a swivel housing, which also covers the opening device 21 and possibly other devices of the rotor spinning device 2. However, it can also, as in the Figs. 2-5 shown, a separate cover 4 may be provided for the rotor housing 3.
  • the cover 4 is shown here in solid lines in a closed position I. From this, the cover can be transferred to an intermediate position II (shown in dashed lines), in which cleaning of the spinning rotor 5 as well as preparation of the yarn end and rewinding of a defective yarn piece can take place. Furthermore, the cover 4 can be transferred to an open position III, in which it is possible to clean the spinning rotor 5 manually or to remove it from the rotor spinning device 2.
  • the rotor spinning device 2 shown here also has a yarn monitoring device 15, by means of which at least one parameter of the finished spun yarn G is monitored. If a yarn defect is detected by the yarn monitoring device 15, the spinning process is interrupted and the yarn G already produced is rewound a little in order to be able to remove the defective yarn piece.
  • the rotor spinning device 2 or the rotor spinning machine 1 has a control unit 17, by means of which the various devices of the rotor spinning device 2 can be controlled both during normal operation and during piecing.
  • the winding device 13, the yarn monitoring device 15, the take-off device 11, the spinning rotor 5 and the feed device 12 are connected to the control unit 17 in a signal-transmitting manner, as shown by the dotted lines.
  • the preparation of a yarn end 9 for piecing is now based on the Figures 2-5 shown.
  • the method for preparing a yarn end 9 is initially used for piecing after a planned interruption of the Spinning operation described with a controlled shutdown of the rotor spinning device 2. Such planned interruptions take place, for example, for maintenance purposes, for changing the bobbin, before shutting down the rotor spinning machine 1 or in the event of the detection of a yarn fault.
  • the devices of the rotor spinning device 2 involved in the yarn production which in the present case comprise the feed device 12, the take-off device 11 and the winding device 13, are braked in a controlled manner until they come to a standstill, so that the yarn G does not tear and runs onto the bobbin 14, but instead up to Interruption of the spinning process continues to be produced.
  • the yarn end 9 is thus at a defined position after the interruption of the spinning process.
  • the devices 11, 12, 13 are braked in such a way that the yarn end 9 is located within the take-off nozzle 7.
  • the rotor spinning device 2 or the rotor housing 3 is shown in a situation in which the spinning process has just been interrupted and the yarn end 9 is inside the draw-off nozzle 7.
  • the cover 4 of the rotor housing 3 is still closed at this time.
  • the method for preparing a yarn end 9 for piecing can also be used in the event of an unplanned interruption of the spinning operation, for example due to a yarn break.
  • the yarn end 9 runs onto the bobbin 14 and from there must be sought either by an operator or by an automatic maintenance device, which can be arranged to be movable or stationary on the rotor spinning machine 1, and into the rotor spinning device 2, in the present case through the draw-off tube 16 , to be led back.
  • the yarn end 9 After the yarn end 9 has been sucked into the rotor spinning device 2, it is also approximately in the position shown. Both after a planned as well as after an unplanned interruption of the spinning operation, it is of course also possible for the yarn end 9 to be located at a different location within the rotor spinning device 2, for example within the draw-off tube 16. Particularly advantageous for the following suction of the yarn end 9, however, is the position within the take-off nozzle 7.
  • the yarn end 9 is at the defined position within the extraction nozzle 7, it can be inserted into the vacuum channel 8, which is shown in Figure 3 is shown.
  • the cover 4 is moved from its closed position I into its intermediate position II, so that the yarn end 9 can be sucked into the vacuum channel 8 by the action of the vacuum.
  • a cover element 18 is arranged on the rotor housing 3, which at least partially covers the gap 19 between the rotor housing 3 and the cover 4 located in the intermediate position II.
  • the in Figure 3 shown vacuum channel 8 a wear protection device 20 recognizable. In the present case, this is designed as a wear protection ring made of a metal, which is inserted into the input region of the vacuum channel 8 at the transition to the rotor housing 3, in order to protect it from cuts by the yarn G when sucking in.
  • the yarn G is meanwhile by the bobbin 14, in the present case by means of the draw-off device 11, against the regular draw-off direction AR (see Fig. 1 ) returned.
  • the yarn end 9 now takes in Figure 3 shown course in which it is held securely due to the negative pressure in the negative pressure channel 8.
  • the yarn end 9 lies directly next to the open edge of the spinning rotor 5 or just touches it, so that the yarn end preparation can now be carried out.
  • rotor cleaning can also be carried out before the yarn end 9 is sucked in.
  • a blower nozzle (not shown) can be introduced into the rotor housing 3 through the open gap 19 between the cover 4 and the rotor housing 3, around the fiber collecting groove 6 blow out the spinning rotor 5.
  • this is not absolutely necessary since, due to the gradual reduction in the feed, hardly any fibers can be deposited in the fiber collecting groove 6.
  • the spinning rotor 5 In order to interrupt the yarn end 9 and prepare it for spinning, the spinning rotor 5 is now rotated and driven for a certain period of time at a defined yarn end preparation speed. While the spinning rotor 5 is operated at an operating speed between approximately 80,000 1 / min and 170,000 1 / min, it is advantageous for the yarn end preparation to provide a much lower yarn end preparation speed between 20,000 and 50,000 1 / min per minute. In this way, on the one hand, a secure interruption of the yarn end 9 and, on the other hand, sufficient fibering and alignment of the fibers can be ensured. In contrast, if the yarn preparation speed is too fast, the yarn end 9 may be severed too quickly and thus an insufficient yarn preparation.
  • the period of time during which the spinning rotor 5 is driven to prepare the yarn ends can preferably be preset depending on the type of fiber material F used and the type of yarn G produced. Usually, the time for the successful preparation of the yarn end 9 is about 5 seconds, but for yarns G that are more difficult to cut, such as coarse yarns, the time can be more than 5 seconds.
  • the take-off device 11 is driven to oscillate, depending on the type of yarn G and the desired length of the prepared Yarn end 9 a movement between 2 mm and 10 mm can be performed.
  • the yarn end preparation takes place after a yarn error has been detected by the yarn monitoring device.
  • the rotor spinning device 2 stopped in a controlled manner so that the yarn end 9 in the in Figure 2 position shown.
  • the yarn end 9 is sucked into the vacuum channel 8 when the yarn G is returned and is located in FIG Figure 3 position shown.
  • the yarn G is still counter to the regular withdrawal direction AR (see Figure 1 ) unwound from the spool 14 and continuously sucked into the vacuum channel 8 until the defective piece of yarn is completely sucked into the vacuum channel 8.
  • the safe suction of the complete, defective yarn piece can be ensured, for example, by the number of revolutions of the draw-off rollers of the draw-off device 11.
  • the take-off device 11 is preferably driven somewhat faster in relation to the peripheral speed or the transport speed of the yarn G than the winding device 13, so that the yarn G is kept under tension and so-called back-loops, a rewinding of the back Yarns G when rewinding can be avoided.
  • the winding device 13 is preferably provided with a soft start control, so that the bobbin 14 and thus the yarn G is not accelerated suddenly, but gradually. It is therefore also advantageous if the speed of the yarn G is adjustable during rewinding.
  • the vacuum level in the vacuum channel 8 can be adjustable. This makes it possible to briefly increase the vacuum level, for example for sucking in the yarn ends 9 both for preparing the yarn ends and for rewinding to eliminate a yarn error, or to adapt it to the type of yarn G. For example, in the case of yarns which are comparatively difficult to cut, the vacuum level can be increased in order to keep these yarns taut and to facilitate the interruption by means of the open edge of the spinning rotor.
  • the yarn end 9 In order to spin the yarn end 9 again, it is only necessary after a particularly advantageous embodiment to transfer the cover 4 from the intermediate position II back to the closed position I.
  • the yarn end 9 is hereby thrown into the fiber collecting groove 6 of the spinning rotor 5 and can connect to the fibers present there due to the feeding that has already started again.
  • the additional length of the yarn end 9 which may be required can be provided by changing the position of the yarn end 9 when the lid 4 is closed.
  • it is also possible to add an additional length of yarn by providing a short-term drive of the trigger device 11 against the regular trigger direction AR.
  • the spinning rotor 5 is operated in the usual manner at a piecing speed which is reduced compared to the regular operating speed and which can be, for example, about 60% to 80% of the operating speed.
  • a piecing speed which is reduced compared to the regular operating speed and which can be, for example, about 60% to 80% of the operating speed.
  • the fiber feed, the yarn formation and the yarn take-off can be better coordinated with one another during the run-up of the drives.
  • the regular spinning process can finally be started, the spinning rotor 5 being accelerated to its regular operating speed.
  • Figure 6 finally shows a top view of the open edge of a spinning rotor 5, which is equipped with separating structures 10 for interrupting and preparing a yarn end 9 for piecing.
  • the edge of the spinning rotor 5 has two partial regions of its s arranged opposite one another, which are provided with a separating structure 10.
  • the separating structure 10 is in each case formed by knurling with a plurality of notches lying next to one another.
  • other designs of the separating structure 10 are also possible.
  • the described method it is possible to achieve a very good yarn end preparation in a reproducible manner, even in different applications and different rotor types.
  • the length of the prepared yarn end 9 is subject to only extremely slight fluctuations.
  • the separating structure 10, particularly in connection with the movement of the yarn end 9 in its longitudinal direction enables a very uniform dissolution of the yarn end and alignment of the fibers, so that piecers of high quality can be produced. It is particularly advantageous that all of the processes described, from cleaning the rotor, sucking in the yarn end 9, to rewinding a defective yarn piece in the intermediate position II of the cover 4 can be carried out, which can save considerable time.

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

Description

Die vorliegende Erfindung betrifft ein Verfahren zum Vorbereiten eines Garnendes zum Anspinnen an einer Rotorspinnvorrichtung einer Rotorspinnmaschine, wobei die Rotorspinnmaschine ein mit einem Deckel verschließbares und über einen Unterdruckkanal mit einem Unterdruck beaufschlagbares Rotorgehäuse, einen in dem Rotorgehäuse drehbar gelagerten und während des Spinnbetriebs mit einer Betriebsdrehzahl umlaufenden Spinnrotor sowie eine Abzugsdüse aufweist. Bei dem Verfahren wird das vorzubereitende Garnende in den Unterdruckkanal der Rotorspinnvorrichtung eingeführt und durch eine Trennstruktur des offenen Randes des sich drehenden Spinnrotors unterbrochen und dadurch zum Anspinnen vorbereitet. Weiterhin betrifft die Erfindung eine entsprechende Rotorspinnmaschine mit wenigstens einer derartigen Rotorspinnvorrichtung.The present invention relates to a method for preparing a yarn end for spinning on a rotor spinning device of a rotor spinning machine, wherein the rotor spinning machine comprises a rotor housing which can be closed with a lid and can be acted upon by a negative pressure via a negative pressure channel, a rotor housing which is rotatably mounted in the rotor housing and rotates at an operating speed during spinning operation Has spinning rotor and a trigger nozzle. In the method, the yarn end to be prepared is introduced into the vacuum channel of the rotor spinning device and interrupted by a separating structure of the open edge of the rotating spinning rotor, and is thus prepared for piecing. Furthermore, the invention relates to a corresponding rotor spinning machine with at least one such rotor spinning device.

Um beim Spinnen an einer Rotorspinnmaschine den Spinnprozess starten zu können oder nach einer Unterbrechung des Spinnprozesses, beispielsweise aufgrund eines Fadenbruches, eines Qualitätsschnittes oder nach dem Herunterfahren der Rotorspinnmaschine den Spinnprozess wieder aufnehmen zu können, muss stets ein Garnende für den Anspinnvorgang vorbereitet werden. Hierfür ist es erforderlich, das Garnende aufzufasern, um die einzelnen Fasern des Garnendes für den Anspinnvorgang auszurichten und von Kurzfasern zu befreien. Das zum Anspinnen vorbereitete Garnende muss dann mit einer möglichst exakt bemessenen Länge wieder in den Spinnrotor zurückgeführt werden, um sich mit dem dort abgelegten Fasermaterial wieder verbinden zu können.In order to be able to start the spinning process when spinning on a rotor spinning machine or to be able to restart the spinning process after an interruption of the spinning process, for example due to a broken thread, a quality cut or after the rotor spinning machine has been shut down, a yarn end must always be prepared for the piecing process. For this it is necessary to unravel the end of the yarn in order to align the individual fibers of the end of the yarn for the piecing process and to remove short fibers. The yarn end prepared for piecing must then be fed back into the spinning rotor with a length that is as precisely dimensioned as possible in order to be able to reconnect with the fiber material stored there.

Zum Vorbereiten von Garnenden für das Anspinnen ist es im Stand der Technik beispielsweise bekannt geworden, das Garnende pneumatisch aufzubereiten. Dabei wird das Garnende einer Luftströmung, die in tangentialer, axialer und oder radialer Richtung des Garnendes wirkt, ausgesetzt.To prepare yarn ends for piecing, it has become known in the prior art, for example, to prepare the yarn end pneumatically. The yarn end is exposed to an air flow which acts in the tangential, axial and or radial direction of the yarn end.

Aus der DE 196 53 389 A1 ist es weiterhin bekannt geworden, das Garnende mittels einer mit Nadeln oder Sägezähnen besetzten, rotierenden Walze vorzubereiten. Mittels einer derartigen Walze ist es möglich, im Rotorgarn typischerweise vorhandene Bauchbinden zu öffnen, welche die pneumatische Garnendenpräparation behindern können. Im Anschluss an das Öffnen der Bauchbinden wird wiederum eine pneumatische Garnendenpräparation durchgeführt.From the DE 196 53 389 A1 it has also become known to prepare the end of the yarn by means of a rotating roller equipped with needles or saw teeth. By means of such a roller, it is possible to open belly bands typically present in the rotor yarn, which can hinder the pneumatic yarn end preparation. After the belly bandages have been opened, a pneumatic yarn end preparation is carried out again.

Aus der DE 10 2012 110 926 A1 ist es weiterhin bekannt geworden, das Garnende mittels des Randbereichs des sich drehenden Spinnrotors aufzubereiten. Das Garn wird hierzu bei zumindest teilweise geöffnetem Rotorgehäuse in die Nähe des offenen Randes des Spinnrotors gebracht. Der Spinnrotor wird nun in Drehung versetzt und der Deckel des Rotorgehäuses geschlossen, so dass das Garnende nun gegen den offenen Rand des Rotors gedrückt und durchtrennt wird. Der Rand des Spinnrotors ist hierzu mit einer Aufrauhung oder einem Schleifmittel versehen. Nach einer anderen Ausführung wird das Garn in das geschlossene Rotorgehäuse eingebracht, wobei ein einzelner angetriebener Rotor in seiner Achsrichtung verschoben wird.From the DE 10 2012 110 926 A1 it has also become known to prepare the yarn end by means of the edge area of the rotating spinning rotor. For this purpose, the yarn is brought near the open edge of the spinning rotor with the rotor housing at least partially open. The spinning rotor is now rotated and the lid of the rotor housing is closed, so that the yarn end is now pressed against the open edge of the rotor and severed. For this purpose, the edge of the spinning rotor is provided with a roughening or an abrasive. According to another embodiment, the yarn is introduced into the closed rotor housing, a single driven rotor being displaced in its axial direction.

Nach dem Einführen des Garnendes wird der Rotor wiederum in seine Betriebsposition zurück verschoben und in Drehung versetzt, so dass es durch das Hochlaufen des Rotors zu einer Unterbrechung des Garnendes kommt.After inserting the yarn end, the rotor is again shifted back into its operating position and set in rotation, so that the yarn end is interrupted by the rotor running up.

Mittels dieser Art der Garnendenvorbereitung können störende Bauchbinden geöffnet werden und die Garnendenpräparation kann direkt an der Spinnstelle durchgeführt werden. Es kann dabei jedoch zu Unterschieden in der Qualität der Garnendenaufbereitung hinsichtlich Länge und Auffaserung des Garnendes kommen.Using this type of yarn end preparation, disruptive belly bandages can be opened and the yarn end preparation can be carried out directly at the spinning station. However, there may be differences in the quality of the yarn end preparation in terms of length and fibering of the yarn end.

Aufgabe der vorliegenden Erfindung ist es daher, ein Verfahren zur Garnendenpräparation sowie eine entsprechende Rotorspinnmaschine vorzuschlagen, mittels welcher auch bei verschiedenen Anwendungen eine gute und gleichmäßige Garnendenvorbereitung erzielbar ist.The object of the present invention is therefore to propose a method for yarn end preparation and a corresponding rotor spinning machine, by means of which a good and uniform yarn end preparation can be achieved even in various applications.

Die Aufgabe wird gelöst mit den Merkmalen der unabhängigen Ansprüche.The object is achieved with the features of the independent claims.

Bei einem Verfahren zum Vorbereiten eines Garnendes zum Anspinnen an einer Rotorspinnvorrichtung, wobei die Rotorspinnvorrichtung ein mit einem Deckel verschließbares und über einen Unterdruckkanal mit einem Unterdruck beaufschlagbares Rotorgehäuse, einen in dem Rotorgehäuse drehbar gelagerten und während des Spinnbetriebs mit einer Betriebsdrehzahl umlaufenden Spinnrotor sowie eine Abzugsdüse aufweist, wird das vorzubereitende Garnende in den Unterdruckkanal der Rotorspinnvorrichtung eingeführt und durch eine Trennstruktur des offenen Randes des sich drehenden Spinnrotors unterbrochen und dadurch zum Anspinnen vorbereitet. Der Spinnrotor wird dabei während der Unterbrechung des Garnendes mit einer definierten Garnendenvorbereitungsdrehzahl angetrieben. Die Garnendenvorbereitungsdrehzahl ist entweder gleich der Betriebsdrehzahl des Spinnrotors oder geringer als die Betriebsdrehzahl des Spinnrotors.In a method for preparing a yarn end for spinning on a rotor spinning device, wherein the rotor spinning device has a rotor housing which can be closed with a lid and can be acted upon by a negative pressure via a negative pressure channel, a spinning rotor which is rotatably mounted in the rotor housing and rotates at an operating speed during spinning operation, and a take-off nozzle , the yarn end to be prepared is introduced into the vacuum channel of the rotor spinning device and interrupted by a separating structure of the open edge of the rotating spinning rotor and is thereby prepared for piecing. The spinning rotor is driven at a defined yarn preparation speed during the interruption of the yarn end. The yarn end preparation speed is either equal to the operating speed of the spinning rotor or less than the operating speed of the spinning rotor.

Durch das Antreiben des Spinnrotors während der Unterbrechung des Garnendes mit einer definierten Drehzahl wird erreicht, dass die Garnenden stets unter jeweils gleichen Bedingungen mit einer definierten Trenngeschwindigkeit unterbrochen werden, so dass auch bei verschiedenen Anwendungen die Garnenden mit einer weitgehend konstanten Garnendenlänge vorbereitet und aufgefasert werden. Durch den Antrieb des Spinnrotors mit einer gegenüber der Betriebsdrehzahl reduzierten Garnendenvorbereitungsdrehzahl kommt es darüber hinaus zu einer sehr schonenden Durchtrennung des Garnendes, welches hierdurch sehr gleichmäßig aufgefasert wird. Aufgrund der gleichmäßigen, reproduzierbar guten Auflösung der Garnenden kann die Erfolgsquote des Anspinnvorganges erhöht werden, so dass insgesamt auch der Maschinennutzeffekt steigt. Zugleich wird durch das in optimaler Weise aufbereitete Garnende auch eine gute und reproduzierbare Qualität des Anspinners erhalten, so dass die Garnqualität insgesamt verbessert werden kann.By driving the spinning rotor during the interruption of the yarn end at a defined speed, the yarn ends are always interrupted under the same conditions at a defined separation speed, so that the yarn ends are prepared and fibered with a largely constant yarn end length even in various applications. The drive of the spinning rotor at a yarn end preparation speed that is reduced compared to the operating speed also results in a very gentle severing of the yarn end, which is thereby fiberized very uniformly. Due to the uniform, reproducible good resolution of the yarn ends, the success rate of the piecing process can be increased, so that the overall machine utilization effect also increases. At the same time, the optimally prepared yarn end also makes it a good and reproducible one Maintain the piecing quality so that the yarn quality as a whole can be improved.

Eine Rotorspinnmaschine mit wenigstens einer Rotorspinnvorrichtung mit einem mit einem Deckel verschließbaren und über einen Unterdruckkanal mit einem Unterdruck beaufschlagbaren Rotorgehäuse, mit einem in dem Rotorgehäuse drehbar gelagerten Spinnrotor sowie mit einer Abzugsdüse, wobei ein Rand des Spinnrotors eine Trennstruktur zum Unterbrechen und Vorbereiten eines in den Unterdruckkanal eingeführten Garnendes zum Anspinnen aufweist, beinhaltet zur Durchführung des Verfahrens zur Garnendenvorbereitung eine entsprechende Steuereinheit. Mittels der Steuereinheit ist es möglich, den Spinnrotor während der Unterbrechung des Garnendes mit einer definierten Garnendenvorbereitungsdrehzahl anzutreiben, die geringer ist als die Betriebsdrehzahl des Spinnrotors.A rotor spinning machine with at least one rotor spinning device with a rotor housing which can be closed with a cover and can be acted upon by a vacuum via a vacuum channel, with a spinning rotor rotatably mounted in the rotor housing and with a draw-off nozzle, an edge of the spinning rotor being a separating structure for interrupting and preparing a vacuum channel introduced thread end for piecing, includes a corresponding control unit for performing the method for thread end preparation. By means of the control unit it is possible to drive the spinning rotor at a defined yarn end preparation speed which is lower than the operating speed of the spinning rotor during the interruption of the yarn end.

Vorteilhaft ist es dabei, wenn die Garnendenvorbereitungsdrehzahl weniger als 80 %, vorzugsweise weniger als 65 % und besonders bevorzugt weniger als 55 % der Betriebsdrehzahl beträgt und vorzugsweise geringer ist als eine Anspinndrehzahl des Spinnrotors. Ein zu schnelles Durchtrennen des Garnendes, bei welchem keine ausreichende Auffaserung erzielt werden kann, wird hierdurch vermieden. Daneben kann insbesondere mit einer Garnendenvorbereitungsdrehzahl von weniger als 55 % der Betriebsdrehzahl auch Sicherheitsaspekten Rechnung getragen werden, wenn die Garnendenvorbereitung bei teilweise geöffnetem Rotorgehäuse durchgeführt wird.It is advantageous if the yarn preparation speed is less than 80%, preferably less than 65% and particularly preferably less than 55% of the operating speed and is preferably less than a spinning speed of the spinning rotor. This prevents the yarn end from being cut too quickly, at which adequate fraying cannot be achieved. In addition, safety aspects can also be taken into account in particular with a yarn end preparation speed of less than 55% of the operating speed if the yarn end preparation is carried out with the rotor housing partially open.

Nach einer Weiterbildung der Erfindung ist es vorteilhaft, wenn der Deckel des Rotorgehäuses vor dem Einführen des Garnendes in den Unterdruckkanal in eine Zwischenstellung, insbesondere eine Halboffenstellung, überführt wird und das vorzubereitende Garnende bei stehendem Spinnrotor und halboffenem Rotorgehäuse in den Unterdruckkanal eingeführt wird. Anschließend wird der Spinnrotor in Drehung versetzt und mit der Garnendenvorbereitungsdrehzahl für die vorbestimmte Zeitdauer angetrieben, wobei das Garn unterbrochen wird. Erst nach dem Unterbrechen des Garnendes wird der Deckel schließlich in eine Geschlossenstellung überführt. Der Deckel des Rotorgehäuses ist hierzu zumindest in eine Geschlossenstellung, eine Offenstellung sowie eine Zwischenstellung, insbesondere eine Halboffenstellung, bringbar bzw. zwischen diesen Stellungen hin und her überführbar.According to a development of the invention, it is advantageous if the cover of the rotor housing is transferred to an intermediate position, in particular a half-open position, before the yarn end is introduced into the vacuum channel, and the yarn end to be prepared is inserted into the vacuum channel with the spinning rotor and half-open rotor housing stationary. Then the spinning rotor is rotated and driven at the yarn end preparation speed for the predetermined period of time, whereby the yarn is interrupted. Only after the yarn end has been interrupted is the lid finally moved into a closed position. For this purpose, the cover of the rotor housing can be brought at least into a closed position, an open position and an intermediate position, in particular a semi-open position, or can be transferred back and forth between these positions.

Nach einer vorteilhaften Weiterbildung des Verfahrens wird das zum Anspinnen vorbereitete Garnende bereits durch das Schließen des Deckels bzw. das Bewegen des Deckels aus der Zwischenstellung in die Geschlossenstellung in die Fasersammelrille des Spinnrotors rückgeführt. Es ist jedoch ebenso möglich, die in den Spinnrotor zurückzuliefernde Garnlänge in üblicher Weise durch einen kurzzeitigen Antrieb der Abzugsrichtung der Rotorspinnvorrichtung entgegen der regulären Abzugsrichtung zur Verfügung zu stellen.According to an advantageous development of the method, the yarn end prepared for piecing is already returned to the fiber collecting groove of the spinning rotor by closing the cover or moving the cover from the intermediate position into the closed position. However, it is also possible to make the length of yarn to be returned to the spinning rotor available in the usual way by briefly driving the take-off direction of the rotor spinning device against the regular take-off direction.

Für eine gute und reproduzierbare Garnendenvorbereitung wird gemäß der Erfindung weiterhin zur Garnendenvorbereitung der Spinnrotor jeweils für eine vorbestimmte Zeitdauer mit der definierten Garnendenvorbereitungsdrehzahl angetrieben. Die vorbestimmte Zeitdauer wird dabei derart festgelegt, dass einerseits von einer zuverlässigen Durchtrennung des Fadenendes innerhalb dieses Zeitraumes ausgegangen werden kann und andererseits der Anspinnvorgang schnell fortgesetzt werden kann, um den Maschinennutzeffekt nicht nachteilig zu beeinflussen. Um für alle Applikationen auf der Rotorspinnmaschine eine optimale Garnendenvorbereitung zu erreichen, ist es weiterhin vorteilhaft, wenn die vorbestimmte Zeitdauer in Abhängigkeit von einer Art des produzierten Garns und/oder einer Art des Spinnrotors eingestellt wird.For a good and reproducible yarn end preparation according to the invention, the spinning rotor is further driven for the yarn end preparation in each case for a predetermined period of time at the defined yarn end preparation speed. The predetermined period of time is determined in such a way that, on the one hand, a reliable severing of the thread end can be assumed within this period and, on the other hand, the piecing process can be continued quickly so as not to adversely affect the machine use effect. In order to achieve optimum yarn end preparation for all applications on the rotor spinning machine, it is furthermore advantageous if the predetermined time period is set as a function of a type of yarn produced and / or a type of spinning rotor.

Nach einer vorteilhaften Weiterbildung des Verfahrens werden im Falle einer planbaren Unterbrechung des Spinnbetriebs an der Garnherstellung beteiligte Vorrichtungen, zumindest eine Speisevorrichtung und eine Spulvorrichtung, derart kontrolliert bis zum Stillstand abgebremst, dass das Garnende sich nach dem kontrollierten Abbremsen innerhalb der Rotorspinnvorrichtung, insbesondere innerhalb der Abzugsdüse befindet. Es kann somit im Falle einer planbaren Unterbrechung des Spinnbetriebs das Auflaufen des Garnendes auf die Spule mit dem folgenden aufwändigen Fadensuchen vermieden werden. Das kontrollierte Herunterfahren der Rotorspinnvorrichtung ist insbesondere in Verbindung mit der Garnendenvorbereitung durch den offenen Rand des Spinnrotors vorteilhaft, da das Garn vollständig in seinem regulären Fadenlauf verbleibt und direkt aus seiner Endposition innerhalb der Rotorspinnvorrichtung bzw. innerhalb der Abzugsdüse in den Unterdruckkanal eingesaugt werden kann, was weiterhin zu einer Steigerung des Maschinennutzeffekts beiträgt.According to an advantageous development of the method, in the event of a planned interruption of the spinning operation, devices involved in the yarn production, at least one feeding device and one winding device, are braked to a standstill in such a controlled manner that the yarn end, after the controlled braking, within the rotor spinning device, especially located inside the trigger nozzle. In the event of a planned interruption of the spinning operation, it is thus possible to avoid running the end of the yarn onto the bobbin with the following complex thread searches. The controlled shutdown of the rotor spinning device is particularly advantageous in connection with the yarn end preparation through the open edge of the spinning rotor, since the yarn remains completely in its regular thread path and can be sucked into the vacuum channel directly from its end position within the rotor spinning device or within the draw-off nozzle, which is what continues to contribute to an increase in the machine utilization effect.

Eine vorteilhafte Weiterbildung des Verfahrens sieht dabei vor, dass das Garnende nach dem kontrollierten Abbremsen entgegen seiner regulären Abzugsrichtung von einer Spule abgewickelt, in den Unterdruckkanal der Rotorspinnvorrichtung eingeführt und rückgespult wird, bis ein fehlerhaftes Garnstück vollständig in den Unterdruckkanal eingesaugt ist, und anschließend das Garnende zum Anspinnen vorbereitet wird. Im Falle eines Qualitätsschnittes kann das fehlerhafte Garnstück somit direkt durch den Unterdruckkanal hindurch eingesaugt, abgetrennt und entsorgt werden. Dabei kann zugleich mit dem Trennen des fehlerhaften Garnstücks bereits die Garnendenvorbereitung für das Wiederanspinnen erfolgen.An advantageous further development of the method provides that after the controlled braking, the yarn end is unwound from a spool against its regular withdrawal direction, inserted into the vacuum channel of the rotor spinning device and rewound until a defective yarn piece is completely sucked into the vacuum channel, and then the yarn end is prepared for piecing. In the case of a quality cut, the defective piece of yarn can thus be sucked in, separated and disposed of directly through the vacuum channel. At the same time that the defective yarn piece is separated, the yarn end preparation for re-spinning can already take place.

Zum Rückspulen des Garnendes werden vorteilhafterweise die Spulvorrichtung und die Abzugsvorrichtung entgegen ihrer regulären Drehrichtung angetrieben, wobei die Abzugsvorrichtung mit einer höheren Geschwindigkeit als die Spulvorrichtung angetrieben wird. Die Höhe der Geschwindigkeit bezieht sich dabei auf die Umfangsgeschwindigkeit der Abzugsvorrichtung bzw. der Spulvorrichtung und somit auf die Geschwindigkeit, mit welcher das Garn transportiert wird. Durch den schnelleren Antrieb der Abzugsvorrichtung wird das zu spulende Garn mit einem Anspannverzug beaufschlagt, wodurch ein Haften des Garnes auf der Spule und hierdurch bedingte eventuelle Back-Loops vermieden werden können. Bei einer Rotorspinnmaschine ist es dabei vorteilhaft, wenn die Spulvorrichtung zum Rückspulen mit einer Sanftanlaufsteuerung versehen ist.For rewinding the yarn end, the winding device and the take-off device are advantageously driven counter to their regular direction of rotation, the take-off device being driven at a higher speed than the winding device. The height of the speed relates to the peripheral speed of the take-off device or the winding device and thus to the speed at which the yarn is transported. Due to the faster drive of the take-off device, the yarn to be spooled is subjected to a tensioning delay, which prevents the yarn from sticking to the spool and any back loops caused thereby. It is there with a rotor spinning machine advantageous if the winding device for rewinding is provided with a soft start control.

Zum kontrollierten Abbremsen der an der Garnherstellung beteiligten Vorrichtungen ist es weiterhin vorteilhaft, wenn der Spinnrotor zunächst von seiner Betriebsdrehzahl auf eine Abbremsdrehzahl, welche geringer ist als die Betriebsdrehzahl, gebracht wird und für eine vorbestimmte Zeitdauer mit der Abbremsdrehzahl angetrieben wird. Erst anschließend wird der Spinnrotor bis zum Stillstand abgebremst. Es kann somit auch während des kontrollierten Abbremsens noch ein reguläres Garn erzeugt werden bzw. zumindest die Länge eines während des kontrollierten Abbremsens produzierten, fehlerhaften Garnstückes reduziert werden. Besonders vorteilhaft ist es dabei, wenn die Abbremsdrehzahl gleich groß wie oder geringer als die Anspinndrehzahl des Spinnrotors ist, da hierdurch im Wesentlichen die gleichen Betriebsbedingungen wie während des Anspinnens herrschen.For controlled braking of the devices involved in yarn production, it is also advantageous if the spinning rotor is first brought from its operating speed to a braking speed which is lower than the operating speed and is driven for a predetermined period of time at the braking speed. Only then is the spinning rotor braked to a standstill. A regular yarn can thus also be produced during the controlled braking or at least the length of a faulty yarn piece produced during the controlled braking can be reduced. It is particularly advantageous if the braking speed is the same as or less than the spinning speed of the spinning rotor, since this essentially results in the same operating conditions as during spinning.

Daneben ist es vorteilhaft, wenn nach dem Überführen des Deckels in die Zwischenstellung und vor dem Einführen des Garnendes in den Unterdrucckanal der Spinnrotor einer Reinigung, insbesondere einer pneumatischen Reinigung, unterzogen wird. Vorteilhaft dabei ist es, dass das Reinigen des Spinnrotors ebenfalls in der Zwischenstellung erfolgen kann und somit Zeit eingespart werden kann, was wiederum dem Maschinennutzeffekt zugutekommt. Neben einer pneumatischen Reinigung ist natürlich auch eine mechanische Reinigung mittels einer Bürste oder eines Schabers möglich.In addition, it is advantageous if after the cover has been transferred to the intermediate position and before the yarn end has been introduced into the underpressure channel, the spinning rotor is subjected to cleaning, in particular pneumatic cleaning. It is advantageous here that the spinning rotor can also be cleaned in the intermediate position and thus time can be saved, which in turn benefits the machine utilization effect. In addition to pneumatic cleaning, mechanical cleaning using a brush or a scraper is of course also possible.

Nach einer besonders vorteilhaften Weiterbildung der Rotorspinnmaschine ist das Unterdruckniveau in dem Unterdruckkanal einstellbar. Bei dem Verfahren zur Garnendenvorbereitung kann somit eine Anpassung des Unterdruckniveaus an die Art des produzierten Garnes vorgenommen werden. Beispielsweise kann bei Garnen, welche schwieriger einzusaugen sind, das Unterdruckniveau erhöht werden.According to a particularly advantageous development of the rotor spinning machine, the vacuum level in the vacuum channel is adjustable. In the process for preparing the yarn ends, the vacuum level can thus be adapted to the type of yarn produced. For example, in the case of yarns that are more difficult to suck in, the vacuum level can be increased.

Ebenso ist es vorteilhaft, wenn das Unterdruckniveau in dem Unterdruckkanal vor dem Einführen des Garnendes in den Unterdruckkanal zumindest kurzzeitig erhöht wird. Das Einführen des Garnendes in den Unterdruckkanal kann hierdurch erleichtert werden.It is also advantageous if the vacuum level in the vacuum channel is at least briefly increased before the yarn end is inserted into the vacuum channel. The insertion of the yarn end into the vacuum channel can be facilitated in this way.

Um die Unterbrechung des Garnendes zuverlässig durchführen zu können, ist es weiterhin vorteilhaft, wenn das Garnende während seiner Unterbrechung mittels einer Abzugsvorrichtung der Rotorspinnvorrichtung vorzugsweise oszillierend in seiner Längsrichtung bewegt wird. Neben der Unterstützung des Trennvorganges kann mittels der Bewegung des Garnendes auch die Länge des vorbereiteten Garnendes eingestellt werden.In order to be able to reliably interrupt the yarn end, it is further advantageous if the yarn end is preferably moved in an oscillating manner in its longitudinal direction during its interruption by means of a take-off device of the rotor spinning device. In addition to supporting the separation process, the length of the prepared yarn end can also be adjusted by moving the yarn end.

Wird für eine planbaren Unterbrechung des Spinnbetriebs die Rotorspinnvorrichtung bzw. die an der Garnherstellung beteiligten Vorrichtungen kontrolliert abgebremst, so ist es vorteilhaft, wenn das Garnende bei Stillstand der Rotorspinnvorrichtung mittels eines Abzugsröhrchen oder einer Klemmvorrichtung in der Spinnvorrichtung, insbesondere in der Abzugsdüse, fixiert wird. Die Rotorspinnvorrichtung weist hierzu vorzugsweise bezogen auf die reguläre Abzugsrichtung des Garnes ein der Abzugsdüse nachgeordnetes Abzugsröhrchen und/oder eine der Abzugsdüse nachgeordnete Klemmvorrichtung auf. Ein Herausrutschen des Garnendes aus der Rotorspinnvorrichtung kann somit auch bei abgestellter Spinnvorrichtung und nicht wirksamem Unterdruck vermieden werden.If the rotor spinning device or the devices involved in the yarn production are braked in a controlled manner for a predictable interruption of the spinning operation, it is advantageous if the yarn end is fixed in the spinning device, in particular in the draw-off nozzle, by means of a draw-off tube or a clamping device when the rotor spinning device is at a standstill. For this purpose, the rotor spinning device preferably has, based on the regular draw-off direction of the yarn, a draw-off tube arranged downstream of the draw-off nozzle and / or a clamping device arranged downstream of the draw-off nozzle. Slipping of the yarn end out of the rotor spinning device can thus be avoided even when the spinning device is turned off and the vacuum is not effective.

Nach einer Weiterbildung der Rotorspinnmaschine ist es vorteilhaft, wenn an dem Rotorgehäuse ein Abdeckelement angeordnet ist, welches in der Zwischenstellung des Deckels einen Spalt zwischen dem Rotorgehäuse und dem Deckel zumindest teilweise bedeckt. Es ist hierdurch möglich, auch bei teilweise geöffnetem Deckel in dem Rotorgehäuse ein Unterdruckniveau aufrechtzuerhalten.According to a development of the rotor spinning machine, it is advantageous if a cover element is arranged on the rotor housing, which at least partially covers a gap between the rotor housing and the cover in the intermediate position of the cover. This makes it possible to maintain a vacuum level in the rotor housing even when the cover is partially open.

Für eine zuverlässige Unterbrechung des Garnendes sowie die Vorbereitung des Garnendes zum Anspinnen ist es weiterhin vorteilhaft, wenn der Spinnrotor der Rotorspinnvorrichtung in wenigstens einem Teilbereich seines Randes, vorzugsweise in zwei einander gegenüberliegenden Teilbereichen seines Randes, mit einer Zahnung oder einer Rändelung versehen ist. Aufgrund dessen, dass lediglich kleine Teilbereiche des Randes mit der Trennstruktur versehen sind, können eventuelle negative Einflüsse der Trennstruktur auf das Spinnergebnis sowie auf den Energiebedarf des Spinnrotors weitgehend vermieden werden.For a reliable interruption of the yarn end and the preparation of the yarn end for piecing, it is also advantageous if the spinning rotor of the rotor spinning device is provided with teeth or knurling in at least a partial area of its edge, preferably in two mutually opposite partial areas of its edge. Because only small subareas of the edge are provided with the separating structure, any negative influences of the separating structure on the spinning result and on the energy requirement of the spinning rotor can be largely avoided.

Nach einer anderen vorteilhaften Ausführung der Rotorspinnmaschine ist der Eingangsbereich des Unterdruckkanals mit wenigstens einer Verschleißschutzeinrichtung, insbesondere einem Verschleißschutzring, versehen. Verschleißspuren durch die Einwirkung des eingesaugten Garnendes können hierdurch vermieden werden.According to another advantageous embodiment of the rotor spinning machine, the inlet area of the vacuum channel is provided with at least one wear protection device, in particular a wear protection ring. Traces of wear from the action of the sucked-in yarn end can thereby be avoided.

Weitere Vorteile der Erfindung werden anhand der nachfolgend dargestellten Ausführungsbeispiele beschrieben. Es zeigen:

Figur 1
eine Rotorspinnvorrichtung einer Rotorspinnmaschine in einer schematischen, geschnittenen Übersichtsdarstellung,
Figur 2
eine Detaildarstellung eines Rotorgehäuses der Rotorspinnvorrichtung in einer schematischen, geschnittenen Darstellung nach einer Unterbrechung des Spinnprozesses,
Figur 3
das Rotorgehäuse der Figur 2 nach dem Einsaugen eines Garnendes,
Figur 4
eine Detaildarstellung des Rotorgehäuses nach der Garnendenvorbereitung,
Figur 5
eine Detaildarstellung des Rotorgehäuses nach dem Rückliefern des Garnendes in die Fasersammelrille und
Figur 6
eine Draufsicht auf den offenen Rand eines Spinnrotors mit einer Trennstruktur.
Further advantages of the invention are described on the basis of the exemplary embodiments illustrated below. Show it:
Figure 1
a rotor spinning device of a rotor spinning machine in a schematic, sectional overview,
Figure 2
2 shows a detailed illustration of a rotor housing of the rotor spinning device in a schematic, sectional illustration after an interruption of the spinning process,
Figure 3
the rotor housing of the Figure 2 after sucking in a yarn end,
Figure 4
a detailed representation of the rotor housing after the yarn end preparation,
Figure 5
a detailed view of the rotor housing after returning the yarn end in the fiber collecting groove and
Figure 6
a plan view of the open edge of a spinning rotor with a separation structure.

Figur 1 zeigt eine Rotorspinnvorrichtung 2 einer Rotorspinnmaschine 1 in einer schematischen Schnittdarstellung. Die Rotorspinnvorrichtung 2 weist in üblicher Weise ein Rotorgehäuse 3 auf, in welchem ein Spinnrotor 5 drehbar gelagert ist und während des Betriebs der Rotorspinnvorrichtung 2 mit einer Betriebsdrehzahl umläuft. Dem Spinnrotor 5 wird ein zu verspinnendes Fasermaterial F über eine Speisevorrichtung 12 und eine Auflösevorrichtung 21, wo es in Einzelfasern aufgelöst wird, zugeführt und in einer Fasersammelrille 6 des Spinnrotors 5 in Form eines Faserringes abgelegt. Von dort wird es in das Ende des in der Rotorspinnvorrichtung 2 produzierten Garnes G eingebunden. Dass im Spinnrotor 5 produzierte Garn wird in ebenfalls bekannter Weise über eine Abzugsdüse 7 mittels einer Abzugsvorrichtung 11, welche vorliegend durch zwei Abzugswalzen gebildet ist, abgezogen und mittels einer Spulvorrichtung 13 auf eine Spule 14 aufgewickelt. Das Rotorgehäuse 3 ist über einen Unterdruckkanal 8 an einen zentralen Unterdrucckanal 22 der Rotorspinnmaschine 1 angeschlossen und wird hierdurch mit einem Spinnunterdruck beaufschlagt. Das Rotorgehäuse 3 ist während des Spinnbetriebs mittels eines Deckels 4 verschlossen. Figure 1 shows a rotor spinning device 2 of a rotor spinning machine 1 in a schematic sectional view. The rotor spinning device 2 has in the usual way a rotor housing 3, in which a spinning rotor 5 is rotatably mounted and rotates at an operating speed during the operation of the rotor spinning device 2. A fiber material F to be spun is fed to the spinning rotor 5 via a feed device 12 and a dissolving device 21, where it is dissolved in individual fibers, and is deposited in a fiber collecting groove 6 of the spinning rotor 5 in the form of a fiber ring. From there it is integrated into the end of the yarn G produced in the rotor spinning device 2. The yarn produced in the spinning rotor 5 is drawn off in a known manner via a take-off nozzle 7 by means of a take-off device 11, which in the present case is formed by two take-off rollers, and is wound onto a spool 14 by means of a winding device 13. The rotor housing 3 is connected via a vacuum channel 8 to a central vacuum channel 22 of the rotor spinning machine 1 and is thereby subjected to a spinning vacuum. The rotor housing 3 is closed by means of a cover 4 during the spinning operation.

In dem Deckel 4 ist die Abzugsdüse 7 sowie gemäß der vorliegenden Darstellung auch ein Abzugsröhrchen 16 angeordnet. Das Abzugsröhrchen 16 ist jedoch nicht unbedingt erforderlich, ebenso kann anstelle des Abzugsröhrchens 16 auch nur ein Drallstauelement vorgesehen sein, welches auch einteilig mit der Abzugsdüse 7 ausgebildet sein kann. Das Abzugsröhrchen 16 ist jedoch vorteilhaft, um das Garn G bei einer Unterbrechung des Spinnbetriebs innerhalb der Rotorspinnvorrichtung 2 zu fixieren, wie im Folgenden noch erläutert wird. Nach vorliegender Darstellung ist der Deckel 4 des Rotorgehäuses 3 Bestandteil eines Schwenkgehäuses, welches auch die Auflösevorrichtung 21 und gegebenenfalls noch weitere Vorrichtungen der Rotorspinnvorrichtung 2 bedeckt. Es kann jedoch auch, wie in den Fig. 2 - 5 gezeigt, ein separater Deckel 4 für das Rotorgehäuse 3 vorgesehen sein.In the cover 4, the discharge nozzle 7 and, according to the present illustration, also a discharge tube 16 are arranged. The draw-off tube 16 is, however, not absolutely necessary; likewise, instead of the draw-off tube 16, only a swirl stowage element can also be provided, which can also be formed in one piece with the draw-off nozzle 7. The draw-off tube 16 is, however, advantageous in order to fix the yarn G when the spinning operation is interrupted within the rotor spinning device 2, as will be explained in the following. According to the present representation, the cover 4 of the rotor housing 3 Part of a swivel housing, which also covers the opening device 21 and possibly other devices of the rotor spinning device 2. However, it can also, as in the Figs. 2-5 shown, a separate cover 4 may be provided for the rotor housing 3.

Der Deckel 4 ist vorliegend in durchgezogenen Linien in einer Geschlossenstellung I gezeigt. Aus dieser ist der Deckel in eine Zwischenstellung II (gestrichelt dargestellt) überführbar, in welcher sowohl eine Reinigung des Spinnrotors 5 als auch eine Garnendenvorbereitung sowie ein Rückspulen eines fehlerhaften Garnstücks stattfinden kann. Weiterhin kann der Deckel 4 in eine Offenstellung III überführt werden, in welcher es möglich ist, den Spinnrotor 5 manuell zu reinigen oder aus der Rotorspinnvorrichtung 2 zu entfernen.The cover 4 is shown here in solid lines in a closed position I. From this, the cover can be transferred to an intermediate position II (shown in dashed lines), in which cleaning of the spinning rotor 5 as well as preparation of the yarn end and rewinding of a defective yarn piece can take place. Furthermore, the cover 4 can be transferred to an open position III, in which it is possible to clean the spinning rotor 5 manually or to remove it from the rotor spinning device 2.

Die vorliegend gezeigte Rotorspinnvorrichtung 2 weist außerdem noch eine Garnüberwachungseinrichtung 15 auf, mittels welcher zumindest ein Parameter des fertig gesponnen Garns G überwacht wird. Wird durch die Garnüberwachungseinrichtung 15 ein Garnfehler detektiert, so wird der Spinnprozess unterbrochen und das bereits produzierte Garn G ein Stück weit rückgespult, um das fehlerhafte Garnstück entfernen zu können.The rotor spinning device 2 shown here also has a yarn monitoring device 15, by means of which at least one parameter of the finished spun yarn G is monitored. If a yarn defect is detected by the yarn monitoring device 15, the spinning process is interrupted and the yarn G already produced is rewound a little in order to be able to remove the defective yarn piece.

Weiterhin weist die Rotorspinnvorrichtung 2 oder auch die Rotorspinnmaschine 1 eine Steuereinheit 17 auf, mittels welcher die verschiedenen Vorrichtungen der Rotorspinnvorrichtung 2 sowohl während des Normalbetriebs als auch beim Anspinnen ansteuerbar sind. Vorliegend sind die Spulvorrichtung 13, die Garnüberwachungseinrichtung 15, die Abzugsvorrichtung 11, der Spinnrotor 5 sowie die Speisevorrichtung 12 signalübertragend mit der Steuereinheit 17 verbunden, wie durch die punktierten Linien dargestellt.Furthermore, the rotor spinning device 2 or the rotor spinning machine 1 has a control unit 17, by means of which the various devices of the rotor spinning device 2 can be controlled both during normal operation and during piecing. In the present case, the winding device 13, the yarn monitoring device 15, the take-off device 11, the spinning rotor 5 and the feed device 12 are connected to the control unit 17 in a signal-transmitting manner, as shown by the dotted lines.

Das Vorbereiten eines Garnendes 9 zum Anspinnen wird nun anhand der Figuren 2 - 5 dargestellt. Das Verfahren zum Vorbereiten eines Garnendes 9 wird zunächst für ein Anspinnen nach einer geplanten Unterbrechung des Spinnbetriebs mit einem kontrollierten Herunterfahren der Rotorspinnvorrichtung 2 geschildert. Derartige geplante Unterbrechungen erfolgen beispielsweise zu Wartungszwecken, zum Spulenwechsel, vor dem Herunterfahren der Rotorspinnmaschine 1 oder im Falle der Detektion eines Garnfehlers. Dabei werden die an der Garnherstellung beteiligten Vorrichtungen der Rotorspinnvorrichtung 2, welche vorliegend die Speisevorrichtung 12, die Abzugsvorrichtung 11 sowie die Spulvorrichtung 13 umfassen, derart kontrolliert bis zum Stillstand abgebremst, dass das Garn G nicht reißt und auf die Spule 14 aufläuft, sondern bis zur Unterbrechung des Spinnprozesses weiter produziert wird. Das Garnende 9 befindet sich somit nach der Unterbrechung des Spinnprozesses an einer definierten Position. Um die Vorbereitung des Garnendes 9 zum Anspinnen zu erleichtern, werden vorliegend die Vorrichtungen 11, 12, 13 derart abgebremst, dass sich das Garnende 9 innerhalb der Abzugsdüse 7 befindet.The preparation of a yarn end 9 for piecing is now based on the Figures 2-5 shown. The method for preparing a yarn end 9 is initially used for piecing after a planned interruption of the Spinning operation described with a controlled shutdown of the rotor spinning device 2. Such planned interruptions take place, for example, for maintenance purposes, for changing the bobbin, before shutting down the rotor spinning machine 1 or in the event of the detection of a yarn fault. The devices of the rotor spinning device 2 involved in the yarn production, which in the present case comprise the feed device 12, the take-off device 11 and the winding device 13, are braked in a controlled manner until they come to a standstill, so that the yarn G does not tear and runs onto the bobbin 14, but instead up to Interruption of the spinning process continues to be produced. The yarn end 9 is thus at a defined position after the interruption of the spinning process. In order to facilitate the preparation of the yarn end 9 for piecing, in the present case the devices 11, 12, 13 are braked in such a way that the yarn end 9 is located within the take-off nozzle 7.

In Figur 2 ist die Rotorspinnvorrichtung 2 bzw. das Rotorgehäuse 3 in einer Situation dargestellt, in der der Spinnprozess gerade unterbrochen wurde und sich das Garnende 9 innerhalb der Abzugsdüse 7 befindet. Der Deckel 4 des Rotorgehäuses 3 ist zu diesem Zeitpunkt noch geschlossen. Das Verfahren zum Vorbereiten eines Garnendes 9 zum Anspinnen ist jedoch auch im Falle einer nicht geplanten Unterbrechung des Spinnbetriebs, beispielsweise durch einen Fadenbruch, anwendbar. In diesem Falle läuft das Garnende 9 auf die Spule 14 auf und muss von dort entweder durch einen Bediener oder durch eine automatische Wartungsvorrichtung, welche verfahrbar oder stationär an der Rotorspinnmaschine 1 angeordnet sein kann, aufgesucht und in die Rotorspinnvorrichtung 2, vorliegend durch das Abzugsröhrchen 16, zurückgeführt werden. Nachdem das Garnende 9 in die Rotorspinnvorrichtung 2 eingesaugt wurde befindet es sich ebenfalls in etwa in der gezeigten Position. Sowohl nach einer geplanten als auch nach einer ungeplanten Unterbrechung des Spinnbetriebs ist es natürlich auch möglich, dass sich das Garnende 9 an einer anderen Stelle innerhalb der Rotorspinnvorrichtung 2 beispielsweise innerhalb des Abzugsröhrchens 16, befindet. Besonders vorteilhaft für das folgende Einsaugen des Garnendes 9 ist jedoch die Position innerhalb der Abzugsdüse 7.In Figure 2 the rotor spinning device 2 or the rotor housing 3 is shown in a situation in which the spinning process has just been interrupted and the yarn end 9 is inside the draw-off nozzle 7. The cover 4 of the rotor housing 3 is still closed at this time. However, the method for preparing a yarn end 9 for piecing can also be used in the event of an unplanned interruption of the spinning operation, for example due to a yarn break. In this case, the yarn end 9 runs onto the bobbin 14 and from there must be sought either by an operator or by an automatic maintenance device, which can be arranged to be movable or stationary on the rotor spinning machine 1, and into the rotor spinning device 2, in the present case through the draw-off tube 16 , to be led back. After the yarn end 9 has been sucked into the rotor spinning device 2, it is also approximately in the position shown. Both after a planned as well as after an unplanned interruption of the spinning operation, it is of course also possible for the yarn end 9 to be located at a different location within the rotor spinning device 2, for example within the draw-off tube 16. Particularly advantageous for the following suction of the yarn end 9, however, is the position within the take-off nozzle 7.

Nachdem nun das Garnende 9 sich an der definierten Position innerhalb der Abzugsdüse 7 befindet, kann es in den Unterdruckkanal 8 eingeführt werden, was in Figur 3 dargestellt ist. Hierzu wird der Deckel 4 aus seiner Geschlossenstellung I in seine Zwischenstellung II verbracht, so dass das Garnende 9 durch die Wirkung des Unterdrucks in dem Unterdruckkanal 8 in diesen eingesaugt werden kann. Um auch in der Zwischenstellung II noch einen ausreichenden Unterdruck in dem Rotorgehäuse 3 vorzuhalten, ist vorliegend ein Abdeckelement 18 an dem Rotorgehäuse 3 angeordnet, welches den Spalt 19 zwischen dem Rotorgehäuse 3 und dem sich in der Zwischenstellung II befindenden Deckel 4 zumindest teilweise abdeckt. Weiterhin ist an dem in Figur 3 dargestellten Unterdruckkanal 8 eine Verschleißschutzeinrichtung 20 erkennbar. Diese ist vorliegend als Verschleißschutzring aus einem Metall ausgebildet, der in den Eingangsbereich des Unterdruckkanals 8 am Übergang zum Rotorgehäuse 3 eingesetzt ist, um diesen vor Einschnitten durch das Garn G beim Einsaugen zu schützen.Now that the yarn end 9 is at the defined position within the extraction nozzle 7, it can be inserted into the vacuum channel 8, which is shown in Figure 3 is shown. For this purpose, the cover 4 is moved from its closed position I into its intermediate position II, so that the yarn end 9 can be sucked into the vacuum channel 8 by the action of the vacuum. In order to maintain a sufficient negative pressure in the rotor housing 3 even in the intermediate position II, in the present case a cover element 18 is arranged on the rotor housing 3, which at least partially covers the gap 19 between the rotor housing 3 and the cover 4 located in the intermediate position II. Furthermore, the in Figure 3 shown vacuum channel 8 a wear protection device 20 recognizable. In the present case, this is designed as a wear protection ring made of a metal, which is inserted into the input region of the vacuum channel 8 at the transition to the rotor housing 3, in order to protect it from cuts by the yarn G when sucking in.

Um die für das Einsaugen erforderliche zusätzliche Garnlänge bereitzustellen, wird das Garn G währenddessen von der Spule 14, in vorliegendem Fall mittels der Abzugsvorrichtung 11, entgegen der regulären Abzugsrichtung AR (s. Fig. 1) rückgeliefert. Das Garnende 9 nimmt nun den in Figur 3 dargestellten Verlauf ein, in welchem es aufgrund des Unterdrucks in dem Unterdruckkanal 8 sicher gehalten ist. Das Garnende 9 liegt dabei unmittelbar neben dem offenen Rand des Spinnrotors 5 oder berührt diesen gerade, so dass nun die Garnendenvorbereitung vorgenommen werden kann.In order to provide the additional yarn length required for the suction, the yarn G is meanwhile by the bobbin 14, in the present case by means of the draw-off device 11, against the regular draw-off direction AR (see Fig. 1 ) returned. The yarn end 9 now takes in Figure 3 shown course in which it is held securely due to the negative pressure in the negative pressure channel 8. The yarn end 9 lies directly next to the open edge of the spinning rotor 5 or just touches it, so that the yarn end preparation can now be carried out.

Gegebenenfalls kann vor dem Einsaugen des Garnendes 9 noch eine Rotorreinigung durchgeführt werden. Hierzu kann beispielsweise durch den offenen Spalt 19 zwischen dem Deckel 4 und dem Rotorgehäuse 3 eine Blasdüse (nicht gezeigt) in das Rotorgehäuse 3 eingebracht werden, um die Fasersammelrille 6 des Spinnrotors 5 auszublasen. Insbesondere im Falle einer kontrollierten Unterbrechung des Spinnprozesses ist dies jedoch nicht unbedingt erforderlich, da aufgrund der allmählichen Reduzierung der Speisung sich kaum Fasern in der Fasersammelrille 6 ablagern können.If necessary, rotor cleaning can also be carried out before the yarn end 9 is sucked in. For this purpose, for example, a blower nozzle (not shown) can be introduced into the rotor housing 3 through the open gap 19 between the cover 4 and the rotor housing 3, around the fiber collecting groove 6 blow out the spinning rotor 5. In particular in the case of a controlled interruption of the spinning process, however, this is not absolutely necessary since, due to the gradual reduction in the feed, hardly any fibers can be deposited in the fiber collecting groove 6.

Um das Garnende 9 zu unterbrechen und zum Anspinnen vorzubereiten, wird nun der Spinnrotor 5 in Drehung versetzt und für eine bestimmte Zeitdauer mit einer definierten Garnendenvorbereitungsdrehzahl angetrieben. Während der Spinnrotor 5 mit einer Betriebsdrehzahl zwischen etwa 80.000 1/min und 170.000 1/min betrieben wird, ist es für die Garnendenvorbereitung vorteilhaft, eine wesentlich niedrigere Garnendenvorbereitungsdrehzahl zwischen 20.000 und 50.000 1/min pro Minute vorzusehen. Hierdurch kann einerseits eine sichere Unterbrechung des Garnendes 9 und andererseits eine ausreichende Auffaserung und Ausrichtung der Fasern sichergestellt werden. Demgegenüber kann es bei einer zu schnellen Garnendenvorbereitungsdrehzahl zu einem zu schnellen Durchtrennen des Garnendes 9 und somit einer unzureichenden Garnendenvorbereitung kommen. Die Zeitdauer, während der der Spinnrotor 5 zur Garnendenvorbereitung angetrieben wird, kann vorzugsweise abhängig von der Art des verwendeten Fasermaterials F sowie der Art des erzeugten Garns G voreingestellt werden. Üblicherweise liegt die Zeitdauer für das erfolgreiche Vorbereiten des Garnendes 9 bei etwa 5 Sekunden, bei schwieriger zu durchtrennenden Garnen G wie Grobgarnen kann die Zeitdauer jedoch mehr als 5 Sekunden betragen.In order to interrupt the yarn end 9 and prepare it for spinning, the spinning rotor 5 is now rotated and driven for a certain period of time at a defined yarn end preparation speed. While the spinning rotor 5 is operated at an operating speed between approximately 80,000 1 / min and 170,000 1 / min, it is advantageous for the yarn end preparation to provide a much lower yarn end preparation speed between 20,000 and 50,000 1 / min per minute. In this way, on the one hand, a secure interruption of the yarn end 9 and, on the other hand, sufficient fibering and alignment of the fibers can be ensured. In contrast, if the yarn preparation speed is too fast, the yarn end 9 may be severed too quickly and thus an insufficient yarn preparation. The period of time during which the spinning rotor 5 is driven to prepare the yarn ends can preferably be preset depending on the type of fiber material F used and the type of yarn G produced. Usually, the time for the successful preparation of the yarn end 9 is about 5 seconds, but for yarns G that are more difficult to cut, such as coarse yarns, the time can be more than 5 seconds.

Gemäß dem vorliegend gezeigten Beispiel ist weiterhin vorgesehen, das Garnende 9 zumindest kurzzeitig während der Garnendenvorbereitung in seiner Längsrichtung mittels der Abzugsvorrichtung 11 hin und her zu bewegen, um einerseits das Unterbrechen des Garnendes 9 zu unterstützen und andererseits eine ausreichende Länge des vorbereiteten Garnendes 9 sicherzustellen. Die Abzugsvorrichtung 11 wird hierzu oszillierend angetrieben, wobei je nach Art des Garnes G und der gewünschten Länge des vorbereiteten Garnendes 9 eine Bewegung zwischen 2 mm und 10 mm durchgeführt werden kann.According to the example shown here, provision is further made to move the yarn end 9 back and forth in its longitudinal direction at least briefly during the yarn end preparation by means of the pull-off device 11, on the one hand to support the interruption of the yarn end 9 and on the other hand to ensure a sufficient length of the prepared yarn end 9. The take-off device 11 is driven to oscillate, depending on the type of yarn G and the desired length of the prepared Yarn end 9 a movement between 2 mm and 10 mm can be performed.

Nachdem nun das Garnende 9 erfolgreich durch den offenen Rand des Spinnrotors 5 unterbrochen und zum Anspinnen vorbereitet wurde, nimmt es die in Figur 4 dargestellte Position ein. Das abgetrennte Garnende 9 wurde dabei durch den Unterdruckkanal 8 und den zentralen Unterdruckkanal 22 der Rotorspinnmaschine 1 abgesaugt und entsorgt, während das neu entstandene Garnende 9 nun bereit zum Anspinnen ist, welches später anhand der Figur 5 beschrieben wird.Now that the yarn end 9 has been successfully interrupted by the open edge of the spinning rotor 5 and prepared for piecing, it takes the in Figure 4 position shown. The separated yarn end 9 was sucked off and disposed of through the vacuum channel 8 and the central vacuum channel 22 of the rotor spinning machine 1, while the newly created yarn end 9 is now ready for spinning, which will later be based on the Figure 5 is described.

In ähnlicher Weise erfolgt die Garnendenvorbereitung nach einer Detektion eines Garnfehlers durch die Garnüberwachungseinrichtung. Hierbei wird, wie zuvor anhand der Figur 2 beschrieben, die Rotorspinnvorrichtung 2 kontrolliert stillgesetzt, so dass sich das Garnende 9 in der in Figur 2 dargestellten Position befindet. Ebenso wie zuvor beschrieben wird unter Rücklieferung des Garnes G das Garnende 9 in den Unterdruckkanal 8 eingesaugt und befindet sich in der in Figur 3 dargestellten Position. Um nun das fehlerhafte Garnstück aus dem Garn G herauszutrennen, wird das Garn G weiterhin entgegen der regulären Abzugsrichtung AR (siehe Figur 1) von der Spule 14 abgewickelt und kontinuierlich in den Unterdruckkanal 8 eingesaugt, bis das fehlerhafte Garnstück vollständig in den Unterdruckkanal 8 eingesaugt ist. Das sichere Einsaugen des vollständigen, fehlerhaften Garnstücks kann dabei beispielsweise durch die Anzahl der Umdrehungen der Abzugswalzen der Abzugsvorrichtung 11 sichergestellt werden.In a similar manner, the yarn end preparation takes place after a yarn error has been detected by the yarn monitoring device. Here, as before using the Figure 2 described, the rotor spinning device 2 stopped in a controlled manner so that the yarn end 9 in the in Figure 2 position shown. Just as described above, the yarn end 9 is sucked into the vacuum channel 8 when the yarn G is returned and is located in FIG Figure 3 position shown. In order to separate the faulty piece of yarn from the yarn G, the yarn G is still counter to the regular withdrawal direction AR (see Figure 1 ) unwound from the spool 14 and continuously sucked into the vacuum channel 8 until the defective piece of yarn is completely sucked into the vacuum channel 8. The safe suction of the complete, defective yarn piece can be ensured, for example, by the number of revolutions of the draw-off rollers of the draw-off device 11.

Zum Rückspulen des fehlerhaften Garnstücks wird dabei vorzugsweise die Abzugsvorrichtung 11 etwas schneller bezogen auf die Umfangsgeschwindigkeit bzw. die Transportgeschwindigkeit des Garnes G angetriebenen als die Spulvorrichtung 13, so dass das Garn G unter Spannung gehalten wird und so genannte Back-Loops, eine rückwärtiges Aufwickeln des Garnes G beim Rückspulen, vermieden werden können. Um das sichere Einsaugen des Garnendes 9 in den Unterdruckkanal 8 zu unterstützen, ist die Spulvorrichtung 13 vorzugsweise mit einer Sanftanlaufsteuerung versehen, so dass die Spule 14 und damit das Garn G nicht ruckartig, sondern allmählich beschleunigt wird. Vorteilhaft ist es daher auch, wenn die Geschwindigkeit des Garnes G beim Rückspulen einstellbar ist. Hierdurch können Garne G, welche aufgrund ihrer Struktur oder ihres Durchmessers schwieriger in den Unterdruckkanal 8 einzuführen sind, mit einer langsameren Geschwindigkeit rückgespult werden. Es kann daher auch sinnvoll sein, dass das Unterdruckniveau in dem Unterdruckkanal 8 einstellbar ist. Hierdurch ist es möglich, das Unterdruckniveau beispielsweise zum Einsaugen der Garnenden 9 sowohl zur Garnendenvorbereitung als auch zum Rückspulen zur Beseitigung eines Garnfehlers, kurzfristig zu erhöhen oder auch an die Art des Garnes G anzupassen. So kann beispielsweise bei Garnen, welche vergleichsweise schwer zu durchtrennen sind, das Unterdruckniveau erhöht werden, um diese Garne straff zu halten und das Unterbrechen mittels des offenen Randes des Spinnrotors zu erleichtern.For rewinding the defective yarn piece, the take-off device 11 is preferably driven somewhat faster in relation to the peripheral speed or the transport speed of the yarn G than the winding device 13, so that the yarn G is kept under tension and so-called back-loops, a rewinding of the back Yarns G when rewinding can be avoided. For safe suction To support the yarn end 9 in the vacuum channel 8, the winding device 13 is preferably provided with a soft start control, so that the bobbin 14 and thus the yarn G is not accelerated suddenly, but gradually. It is therefore also advantageous if the speed of the yarn G is adjustable during rewinding. As a result, yarns G, which are more difficult to insert into the vacuum channel 8 due to their structure or their diameter, can be rewound at a slower speed. It can therefore also make sense for the vacuum level in the vacuum channel 8 to be adjustable. This makes it possible to briefly increase the vacuum level, for example for sucking in the yarn ends 9 both for preparing the yarn ends and for rewinding to eliminate a yarn error, or to adapt it to the type of yarn G. For example, in the case of yarns which are comparatively difficult to cut, the vacuum level can be increased in order to keep these yarns taut and to facilitate the interruption by means of the open edge of the spinning rotor.

Nachdem nun das fehlerhafte Garnstück vollständig in den Unterdruckkanal 8 eingesaugt ist, werden die Abzugsvorrichtung 11 sowie die Spulvorrichtung 13 gestoppt und der Spinnrotor 5 wiederum mit der Garnendenvorbereitungsdrehzahl angetrieben, um das Garnende 9 vorzubereiten. Das Garnende 9 nimmt nun wiederum den in Figur 4 dargestellten Verlauf ein.After the defective piece of yarn has been completely sucked into the vacuum channel 8, the take-off device 11 and the winding device 13 are stopped and the spinning rotor 5 is again driven at the yarn end preparation speed in order to prepare the yarn end 9. The yarn end 9 now again takes the in Figure 4 shown history.

Um nun das Garnende 9 wieder anzuspinnen, ist es nach einer besonders vorteilhaften Ausführung lediglich erforderlich, den Deckel 4 aus der Zwischenstellung II wieder in die Geschlossenstellung I zu überführen. Das Garnende 9 wird hierdurch in die Fasersammelrille 6 des Spinnrotors 5 abgeworfen und kann sich mit den dort aufgrund der bereits wieder einsetzenden Einspeisung vorhandenen Fasern verbinden. Die eventuell erforderliche zusätzliche Länge des Garnendes 9 kann dabei durch die Änderung der Position des Garnendes 9 beim Schließen des Deckels 4 bereitgestellt werden. Ebenso ist es jedoch auch möglich, eine erforderliche, zusätzliche Garnlänge durch einen kurzzeitigen Antrieb der Abzugsvorrichtung 11 entgegen der regulären Abzugsrichtung AR bereitzustellen.In order to spin the yarn end 9 again, it is only necessary after a particularly advantageous embodiment to transfer the cover 4 from the intermediate position II back to the closed position I. The yarn end 9 is hereby thrown into the fiber collecting groove 6 of the spinning rotor 5 and can connect to the fibers present there due to the feeding that has already started again. The additional length of the yarn end 9 which may be required can be provided by changing the position of the yarn end 9 when the lid 4 is closed. However, it is also possible to add an additional length of yarn by providing a short-term drive of the trigger device 11 against the regular trigger direction AR.

Zum Anspinnen wird der Spinnrotor 5 in üblicher Weise mit einer gegenüber der regulären Betriebsdrehzahl reduzierten Anspinndrehzahl betrieben, welche beispielsweise bei etwa 60 % bis 80 % der Betriebsdrehzahl liegen kann. Hierdurch können während des Hochlaufens der Antriebe die Faserzuspeisung, die Garnbildung sowie der Garnabzugs besser aufeinander abgestimmt werden. Nach dem erfolgreichen Anspinnen kann schließlich der reguläre Spinnprozesses aufgenommen werden, wobei der Spinnrotor 5 auf seine reguläre Betriebsdrehzahl beschleunigt wird.For piecing, the spinning rotor 5 is operated in the usual manner at a piecing speed which is reduced compared to the regular operating speed and which can be, for example, about 60% to 80% of the operating speed. As a result, the fiber feed, the yarn formation and the yarn take-off can be better coordinated with one another during the run-up of the drives. After successful piecing, the regular spinning process can finally be started, the spinning rotor 5 being accelerated to its regular operating speed.

Figur 6 zeigt schließlich noch eine Draufsicht auf den offenen Rand eines Spinnrotors 5, der mit Trennstrukturen 10 zum Unterbrechen und Vorbereiten eines Garnendes 9 zum Anspinnen ausgestattet ist. Vorliegend weist der Rand des Spinnrotors 5 einander gegenüberliegend angeordnet zwei Teilbereiche seines s auf, die mit einer Trennstruktur 10 versehen sind. Die Trennstruktur 10 ist dabei jeweils durch eine Rändelung mit mehreren nebeneinanderliegenden Kerben ausgebildet. Andere Ausführungen der Trennstruktur 10 sind jedoch ebenso möglich. Figure 6 finally shows a top view of the open edge of a spinning rotor 5, which is equipped with separating structures 10 for interrupting and preparing a yarn end 9 for piecing. In the present case, the edge of the spinning rotor 5 has two partial regions of its s arranged opposite one another, which are provided with a separating structure 10. The separating structure 10 is in each case formed by knurling with a plurality of notches lying next to one another. However, other designs of the separating structure 10 are also possible.

Mittels des beschriebenen Verfahrens ist es möglich, eine sehr gute Garnendenvorbereitung auch bei verschiedenen Anwendungen sowie verschiedenen Rotortypen reproduzierbar zu erreichen. Dabei ist insbesondere die Länge des vorbereiteten Garnendes 9 nur äußerst geringen Schwankungen unterworfen. Zudem kann durch die Trennstruktur 10 insbesondere in Verbindung mit der Bewegung des Garnendes 9 in seiner Längsrichtung eine sehr gleichmäßige Auflösung des Garnendes und Ausrichtung der Fasern erzielt werden, so dass Anspinner von hoher Qualität erzeugt werden können. Besonders vorteilhaft ist es dabei, dass sämtliche der geschilderten Vorgänge vom Rotorreinigen, dem Einsaugen des Garnendes 9 bis zum Rückspulen eines fehlerhaften Garnstücks in der Zwischenstellung II des Deckels 4 durchgeführt werden können, wodurch eine erhebliche Zeitersparnis erreicht werden kann.Using the described method, it is possible to achieve a very good yarn end preparation in a reproducible manner, even in different applications and different rotor types. In particular, the length of the prepared yarn end 9 is subject to only extremely slight fluctuations. In addition, the separating structure 10, particularly in connection with the movement of the yarn end 9 in its longitudinal direction, enables a very uniform dissolution of the yarn end and alignment of the fibers, so that piecers of high quality can be produced. It is particularly advantageous that all of the processes described, from cleaning the rotor, sucking in the yarn end 9, to rewinding a defective yarn piece in the intermediate position II of the cover 4 can be carried out, which can save considerable time.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
RotorspinnmaschineRotor spinning machine
22
RotorspinnvorrichtungRotor spinning device
33
Rotorgehäuserotor housing
44
Deckelcover
55
Spinnrotorspinning rotor
66
Fasersammelrille des SpinnrotorsFiber collecting groove of the spinning rotor
77
Abzugsdüsenavel
88th
UnterdruckkanalVacuum channel
99
Garnendeyarn
1010
Trennstrukturseparation structure
1111
Abzugsvorrichtungoff device
1212
Speisevorrichtungfeeder
1313
Spulvorrichtungspooling device
1414
SpuleKitchen sink
1515
GarnüberwachungseinrichtungGarnüberwachungseinrichtung
1616
Abzugsröhrchendraw-off tube
1717
Steuereinheitcontrol unit
1818
Abdeckelementcover
1919
Spaltgap
2020
VerschleißschutzeinrichtungWear protective device
2121
Auflösevorrichtungdissolver
2222
zentraler Unterdruckkanalcentral vacuum channel
II
Geschlossenstellungclosed position
IIII
HalboffenstellungHalf open position
IIIIII
Offenstellungopen position
ARAR
Abzugsrichtungwithdrawal direction
DRDR
reguläre Drehrichtungregular direction of rotation
FF
Fasermaterialfiber material
GG
Garnyarn

Claims (15)

  1. Method for preparing a yarn end (9) for piecing at a rotor spinning device (2) of a rotor spinning machine (1) with a rotor housing (3) that can be closed with a cover (4) and can be subjected to negative pressure through a negative pressure channel (8), with a spinning rotor (5) that is rotatably mounted in the rotor housing (3) and rotates with an operating rotational speed during the spinning operation along with a draw-off nozzle (7), wherein, with the method, the yarn end (9) to be prepared is introduced into the negative pressure channel (8), and is interrupted by a separation structure (10) of the open edge of the rotating spinning rotor (5), and is thereby prepared for piecing, characterized in that, during the interruption of the yarn end (9), the spinning rotor (5) is driven with a defined rotational speed for the preparation of the yarn end, wherein the spinning rotor (5) being driven for a predetermined period of time at the rational speed for the preparation of the yarn end and wherein the rotational speed for the preparation of the yarn end is less than the operating rotational speed of the spinning rotor (5) or is equal to the operating rotational speed of the spinning rotor (5), wherein preferably the rotational speed for the preparation of the yarn end amounts to less than 80%, preferably less than 65%, and particularly preferably less than 55%, of the operating rotational speed, and preferably less than a piecing rotational speed of the spinning rotor (5).
  2. Method according to the preceding claim, characterized in that, prior to introducing the yarn end (9) into the negative pressure channel (8), the cover (4) of the rotor housing (3) is transferred into an intermediate position (II), the yarn end (9) to be prepared is, with a stationary spinning rotor (5), introduced into the negative pressure channel (8), the spinning rotor (5) is set into rotation and is driven with the rotational speed for the preparation of the yarn end for a predetermined time period, wherein the yarn end (9) is interrupted, and only after the interruption of the yarn end (9) is the cover (4) finally transferred into a closed position (I), wherein the predetermined time period, during which the spinning rotor (5) is driven with the rotational speed for the preparation of the yarn end, is adjusted depending on the type of the produced yarn (G) and/or the type of the spinning rotor (5).
  3. Method according to one of the preceding claims, characterized in that, in the case of a predictable interruption of the spinning operation of the devices involved in yarn production, at least one feed device (12) and one winding device (13) are slowed down to a standstill in a controlled manner such that, after the controlled slowing down of the devices, the yarn end (9) is located within the rotor spinning device (2), in particular within the draw-off nozzle (7).
  4. Method according to the preceding claim, characterized in that, after the controlled slowing down, the yarn end (9) is unwound from a coil (14) counter to its regular draw-off direction (AR), introduced into the negative pressure channel (8) of the rotor spinning device (2) and is rewound, until a defective yarn piece is completely sucked into the negative pressure channel (8), and the yarn end (9) is subsequently prepared for piecing, wherein preferably for rewinding the yarn end (9), the winding device (13) and the draw-off device (11) are driven counter to their regular direction of rotation (DR) or counter to the regular draw-off direction (AR), and the draw-off device (11) is driven at a higher speed than the winding device (13).
  5. Method according to one of the preceding claims, characterized in that, for the controlled slowing down, the spinning rotor (5) is initially brought from its operating rotational speed to a rotational speed for slowing down, which is less than the operating rotational speed, and is driven with the rotational speed for slowing down for a predetermined time period, and only then is slowed down to a standstill, wherein the rotational speed for slowing down is equal to or less than the piecing rotational speed of the spinning rotor (5).
  6. Method according to one of the preceding claims 2 to 5, characterized in that, after the transfer of the cover (4) into the intermediate position (II) and prior to the introduction of the yarn end (9), the spinning rotor (5) is subjected to a cleaning, in particular a pneumatic cleaning.
  7. Method according to one of the preceding claims, characterized in that the negative pressure level in the negative pressure channel (8) during the preparation of the yarn end (9) is adjustable, in particular depending on the type of yarn produced (G) and/or the negative pressure level in the negative pressure channel (8) is increased, at least temporarily, prior to the introduction of the yarn end (9) into the negative pressure channel (8).
  8. Method according to one of the preceding claims, characterized in that the yarn end (9) is displaced in its longitudinal direction during its interruption by means of a draw-off device (11).
  9. Method according to one of the preceding claims, characterized in that, during a standstill of the rotor spinning device (2), after a controlled slowing down, the yarn end (9) is fixed by means of a draw-off tube (16) or a clamping device in the rotor spinning device (2), in particular in the draw-off nozzle (7).
  10. Rotor spinning machine (1) with at least one rotor spinning device (2) with a rotor housing (3) that can be closed with a cover (4) and can be subjected to negative pressure through a negative pressure channel (8), with a spinning rotor (5) that is rotatably mounted in the rotor housing (3) along with a draw-off nozzle (7), wherein an edge of the spinning rotor (5) features a separation structure (10) for interrupting and preparing a yarn end (9) introduced in the negative pressure channel (8) for piecing, characterized in that the rotor spinning machine (1) and/or the rotor spinning device (2) features a control unit (17), by means of which the rotor spinning device (2) is operated in accordance with the claim 1.
  11. Rotor spinning machine according to the preceding claim, characterized in that the cover (4) of the rotor housing (3) can be brought into a closed position (I), an open position (III) or an intermediate position (II), wherein a cover element (18) is arranged on the rotor housing (3), which cover element at least partially covers, in the intermediate position (II) of the cover, a gap (19) between the rotor housing (3) and the cover.
  12. Rotor spinning machine according to one of the two preceding claims, characterized in that the negative pressure level in the negative pressure channel (8) is adjustable.
  13. Rotor spinning machine according to one of the claims 10 to 12, characterized in that the entrance area of the negative pressure channel (8) is provided with at least one wear protection device (20), in particular a wear protection ring.
  14. Rotor spinning machine according to one of the claims 10 to 13, characterized in that the spinning rotor (5) is provided with a toothing or a knurling as a separation structure (10) in at least one partial area of its edge, preferably in two opposite partial areas of its edge.
  15. Rotor spinning machine according to one of the claims 10 to 14, characterized in that the rotor spinning device (2) features, with reference to the regular draw-off direction (AR) of the yarn, a draw-off tube (16) downstream of the draw-off nozzle (7) and/or a clamping device downstream of the draw-off nozzle (7).
EP16192712.4A 2015-10-08 2016-10-07 Method for preparing a yarn end for spinning on a rotor spinning device of a rotor spinning machine and rotor spinning machine Active EP3153612B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015117204.6A DE102015117204A1 (en) 2015-10-08 2015-10-08 Process for preparing a yarn end for piecing on a rotor spinning device of a rotor spinning machine and rotor spinning machine

Publications (2)

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EP3153612A1 EP3153612A1 (en) 2017-04-12
EP3153612B1 true EP3153612B1 (en) 2020-01-15

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EP16192712.4A Active EP3153612B1 (en) 2015-10-08 2016-10-07 Method for preparing a yarn end for spinning on a rotor spinning device of a rotor spinning machine and rotor spinning machine

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US (1) US10400360B2 (en)
EP (1) EP3153612B1 (en)
CN (1) CN106995952B (en)
DE (1) DE102015117204A1 (en)

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DE102017113029A1 (en) 2017-06-13 2018-12-13 Maschinenfabrik Rieter Ag Method for producing a rotor cup for an open-end spinning rotor and rotor cup for an open-end spinning rotor
DE102017123279A1 (en) * 2017-10-06 2019-04-11 Maschinenfabrik Rieter Ag Rotor spinning machine with at least one air line for supplying ambient air into a bearing housing and spinning device of a rotor spinning machine
DE102017124983A1 (en) * 2017-10-25 2019-04-25 Maschinenfabrik Rieter Ag Changiereinheit, method for operating a traversing unit and job with a traversing unit
DE102018112594A1 (en) * 2018-05-25 2019-11-28 Maschinenfabrik Rieter Ag Process for preparing a yarn for piecing on a rotor spinning device of a rotor spinning machine and rotor spinning machine
CN113652774B (en) * 2020-12-30 2022-12-02 苏州多道自动化科技有限公司 Full-automatic intelligent control method and system for rotor spinning fasciated yarn
CN115467056B (en) * 2021-06-10 2023-10-27 卓郎（江苏）纺织机械有限公司 Spinning box for open-end rotor spinning device
US20230228007A1 (en) 2022-01-20 2023-07-20 Maschinenfabrik Rieter Ag Method for operating a spinning station of a rotor spinning machine and rotor spinning machine
DE102022129721A1 (en) 2022-01-20 2023-07-20 Maschinenfabrik Rieter Ag Method for operating a spinning station of a rotor spinning machine and rotor spinning machine

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Also Published As

Publication number Publication date
US10400360B2 (en) 2019-09-03
US20170101728A1 (en) 2017-04-13
CN106995952A (en) 2017-08-01
DE102015117204A1 (en) 2017-04-13
EP3153612A1 (en) 2017-04-12
CN106995952B (en) 2021-09-07

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