EP2657380B1 - Method and apparatus for operating workstations of an open-end rotor spinning machine - Google Patents

Description

The invention relates to a method for operating workstations of an open-end rotor spinning machine according to the preamble of claim 1 and to a workstation according to claim 5.

Open-end rotor spinning machines, which have a variety of jobs and where the jobs are powered by mobile, self-acting service units have long been known and described in detail in numerous patent applications.

Furthermore, open-end rotor spinning machines are known whose jobs are designed as largely self-sufficient jobs.

In the DE 101 39 075 A1 For example, such largely self-sufficient jobs of open-end rotor spinning machines are shown and explained in relative detail.

Such workstations have, inter alia, in each case an open-end spinning device for producing a thread and a winding device for producing a cross-wound bobbin.

The winding device preferably has a defined pivotally mounted creel, acted upon by a reversible single drive drive drum and a motor driven Einzelchaser Fadenchangiereinrichtung. In addition, such jobs are equipped with a pivotally mounted, first suction nozzle, which is adjustable by means of a single drive between a thread receiving position in the region of a held in the winding device cheese and a yarn transfer position in the field of open-end spinning device.

As indicated above, a fiber sliver initially placed in a sliver can, for example, is spun onto a yarn at such work stations, which sliver is then wound up into a cross-wound bobbin.

Although such jobs are designed so that they can produce a cheese largely automatically, for example, after a winding break due to a thread break again spontaneously, it is in such jobs previously required to replace a finished cheese either manually or a special, mobile service unit , a so-called cheese changer to use. If necessary, such a cheese changer exchanges a finished cross-wound bobbin for an empty tube. That is, the known automatic OffenendRotorpinnmaschinen are usually equipped with a cheese changer or a so-called cleaner and changer car, which is mounted on a mobile above the work stations rail system and, for example, engages when reached at one of the jobs a cross-wound bobbin its predetermined diameter and has to be replaced with a new empty tube.

In order to prevent in particular in quite long open-end rotor spinning machines that individual jobs too long to wait for the cheese and on the cleaner and changer car, has also been proposed to use several of these service units simultaneously on an open-end rotor spinning machine.

Cheese packages or cleaning and changer cars are known in connection with cross-wound textile machines in various embodiments and, for example, in of the DE 10 2007 048 721 A1 or the DE 10 2004 035 261 A1 described in relative detail.

Furthermore, for example by the DE 10 2008 009 321 A1 a so-called semi-automatic open-end rotor spinning machine, the jobs each have a, in professional circles also referred to as a third hand, short suction pipe, which is connected to a separate, machine-long vacuum channel and closed during the "normal" spinning operation.

This suction tube is used in particular in connection with cheeses / empty tube changes, which are performed manually in such semiautomatic OffenendRotorpinnmaschinen and in which the spinning process is not interrupted at the affected job.

That is, the continuously produced during the cheese / Leerhülsenwechsels in Offenendspinvorrichtung further produced thread is disposed of by this suction pipe until the thread can be manually re-applied to a new empty tube, which is also manually inserted into the creel.

Furthermore, by the DE 23 29 798 A1 a method is known, with the bobbin change on a new sleeve a reserve winding can be created.

To perform this method, the jobs of this known OffenendRotorpinnmaschine are each equipped with two stationary suction nozzles.

The first suction nozzle is arranged in the direction of yarn travel between the thread withdrawal device of the job and a Fadenchangiereinrichtung and has the function in the event of a yarn break to receive the weiterproduzierten by an open-end spinning device of the affected job thread.

The second suction nozzle is positioned in the thread running direction just behind the bobbin drive roller arranged in the region of the winding device of the work station and has a thread cutting device which can be actuated by a switching device of the bobbin frame.

In the method according to DE 23 29 798 A1 For example, a majority of the operations required during the cross-winding / empty-tube change are performed manually by the operating personnel. That is, in a cheese / Leerhülsenwechsel an operator must manually lift the creel in a locked position, take the cheese from the creel by hand and put on a conveyor belt. Previously, the operator, also by hand, take the further produced by the open-end spinning device from the traversing thread guide the job, put in a notch in front of the bobbin drive roller arranged Fadenleitbleches and transport to the second suction nozzle, in which the thread is then sucked like a loop.

After the operator has manually inserted a new empty tube in the creel, the operator lowers the creel and thus the empty tube in the direction of the bobbin drive roller, wherein when placing the empty tube on the bobbin drive roller an adhesive zone of the empty tube detects the incoming into the suction nozzle thread. At the same time, the thread cutting device integrated in the second suction nozzle is actuated by a switching device on the creel, which separates the yarn between the finished, to be replaced cross-wound bobbin and the newly inserted empty tube. Subsequently, the thread is hooked by the open-end spinning device further running thread by the operator by hand in the traversing yarn guide and thus started a new winding process.

Based on the aforementioned prior art, the present invention seeks to develop a method which makes it possible that the jobs of a OffenendRotorspinnmaschine if necessary, can also automatically perform cross coil / empty tube change. That is, the jobs should be designed so that in a cheese / Leerhülsenwechsel neither the use of a cleaner and changer car necessary, nor a manual intervention by the operating personnel is required.

This object is achieved by a method as described in claim 1 or by a job having the features described in claim 5.

Advantageous embodiments of the invention are the subject of the dependent claims. In the advantageous method described in claim 1, the winding process of the cross-wound bobbin is initially interrupted when a predetermined diameter of the cross-wound bobbin from the work and a cross-coil / empty tube change initiated. That is, the thread produced by the open-end spinning device is first temporarily disposed of by a second suction nozzle positioned as required by a drive device in the area of a winding device of the workstation and transfers the finished cross-wound bobbin to a spinning machine-specific transport device by appropriate control of a creel. Subsequently, the bobbin frame is equipped with a new empty tube from a work-empty envelope magazine and finally the bobbin frame pivoted back in a winding position.

The movably mounted second suction nozzle is then positioned so that the yarn entering the movably mounted second suction nozzle is transferred to the empty sleeve held in the coil frame and the winding process to the new empty sleeve is restarted. The method described above not only has the advantage that in connection with a cheese / empty tube change now can be dispensed with the use of a special service unit, without affecting the operating personnel is charged more, but with the inventive method can on relative simple and inexpensive way a safe and fast cheeses / empty tube change can be realized.

In a first, described in claim 2 embodiment is provided that, when reaching a predetermined diameter of the cheese, the movably mounted second suction nozzle positioned in the path of the running on the cross-wound yarn, the Thread cut and then further processed by the open-end spinning device thread is temporarily taken up and disposed of by the second suction nozzle. This means that at the affected workstation there is no interruption of the spinning process of the open-end spinning device. Accordingly, no new piecing process must be started. The waiver of a spinning break and the associated piecing process has the advantage, among other things, that at the work site, at least at this time, no time-consuming cleaning operations are necessary, with the result that the process steps described in claim 2 to minimize the on the Jobs for a cheese / empty tube change require time consuming lead.

As described in claim 3, instead of the method described in claim 2 in an alternative embodiment, however, also be provided that when reaching a predetermined diameter of the cheese initially the sliver supply to the open-end spinning device and thus the spinning interrupted and then through the first suction nozzle taken after the spinning interruption accumulated on the cheese spool end and is retrieved for Wiederanspinnen to the open-end spinning device.

By such a procedure, it can be ensured, in particular, that each of the finished cheeses always has exactly a predefinable amount of thread material, which is often very advantageous, in particular in subsequent working processes.

According to claim 4 is further provided in an advantageous embodiment, that the movably mounted second suction nozzle positioned in the region of the path of the re-spun yarn, the thread cut and made by the open-end spinning device thread temporarily through the second suction nozzle is taken up and disposed of. That is, the appropriately positioned, vacuum-pressurized second suction nozzle allows the thread produced by the open-end spinning device to be cut and temporarily received by the second suction nozzle so that, after transferring the finished cross-wound bobbin to, for example, a textile-own cross-bobbin transport device for the start of a winding process ready.

As described in claim 5, the workstation of the open-end rotor spinning machine has an open-end spinning device for producing a thread and a winding device for producing a cross-wound bobbin, wherein the winding device has a pivotally mounted creel, acted upon by a reversible single drive drive drum and a single motor driven Has thread crossing and the workstation is equipped with a pivotally mounted first suction nozzle, which is adjustable by means of a single drive between a thread receiving position in the region of a held in the winding device cheese and a yarn transfer position in the field of open-end spinning device. To carry out the method according to the invention, the workstation also advantageously has a movably mounted second suction nozzle, which can be acted upon under vacuum as required and positioned by a drive device in the area of the yarn path of a thread produced by an open-end spinning device and running onto the cheese in that the thread can be easily cut, picked up and safely disposed of temporarily.

Furthermore, the workstation has a creel which is designed and positionable so that it can release a finished cross-wound bobbin and take over a new empty tube from an empty-tube magazine.

The use of a movably mounted second suction nozzle, which can be positioned by a drive device in the region of the yarn path of a thread produced by the open-end spinning device, as well as a coil frame, which can be opened and closed defined if necessary, in particular has the advantage that equipped with such Employment an increase in productivity of jobs of open-end spinning machine is possible. That is, such a training of jobs allows at any time to carry out a necessary cheese / empty tube change. In this way, the downtimes occurring at the workstations of open-end spinning machines in connection with cheese / empty tube changes can be minimized, which has a very positive effect in the calculation of the overall efficiency of such open-end spinning machine.

According to claim 6 is also provided in an advantageous embodiment that the movably mounted second suction nozzle can be positioned defined by means of a controllable by the workstation computer drive means.

Such a controllable drive device can either be as described in claim 11, designed as a pneumatic cylinder, or, as described in claim 12, be implemented by a stepper motor, stepper motors, for example, have the advantage that they can be positioned accurately and reproducibly at any time without much control effort are. In addition, stepper motors are commercially available mass-produced parts that are relatively inexpensive, but this also applies to pneumatic cylinders.

It is described in claim 7 that, in an advantageous embodiment, it is further provided that a thread cutting device is installed in the region of the mouth opening of the movably mounted second suction nozzle.

Such a thread cutting device allows, if necessary, not only a safe separation of the running on the surface of the cheese thread, but also ensures that the produced by the open-end spinning device, constantly redelivered thread can be reliably sucked into the suction nozzle and disposed of this temporarily. That is, the thread cutting device is positioned so that the continuously supplied yarn produced by the open-end spinning device can be securely separated and then reliably sucked into the suction nozzle on the one hand.

According to claim 8 is also provided that the movably mounted second suction nozzle is connected via a controllable valve means to a vacuum source.

Such a design can ensure that the suction nozzle is only subjected to negative pressure when there is a vacuum requirement at the suction nozzle.

That is, the system works relatively energy efficient.

As described in claim 9, may be further provided in an alternative, quite advantageous embodiment, that the second suction nozzle is part of a Spulenabrollbleches.

The Spulenabrollblech is designed and movably mounted so that the second suction nozzle can be positioned in case of need in the range of the yarn path of a running on the cross-wound yarn.

In an advantageous embodiment, the Spulenabrollblech, as defined in claim 10, is defined by means of a controllable from a workstation computer drive means positionable.

Such a controllable drive device for the Spulenabrollblech can either, as already explained above in connection with the claim 6, be designed as a pneumatic cylinder (Anspr.11), or, as described in claim 12, be realized by a stepper motor.

In the formation of the drive device as a pneumatic cylinder, this is preferably connected via a valve device which can be controlled by means of a workstation computer, connected to a vacuum source.

Also in the formation of the drive means as a stepping motor, this is advantageously via a control line to the workstation computer connected. That is, in both cases, the drive means via the workstation computer each defined controllable.

Further details of the invention are shown in an embodiment explained below with reference to the drawings.

Fig.1

eine perspektivische Ansicht eine Arbeitsstelle einer Offenend-Rotorspinnmaschine, mit einer im Bereich der Spulvorrichtung installierten ersten Ausführungsform einer beweglich gelagerten zweiten Saugdüse,

Fig.2

in Seitenansicht eine Arbeitsstelle einer Offenend-Rotorspinnmaschine, mit einer an einem beweglich gelagerten Spulenabrollblech angeordneten zweiten Saugdüse (zweite Ausführungsform),

Fig.3

eine Draufsicht auf eine zweite Saugdüse gemäß Fig.2.

It shows:

Fig.1

3 is a perspective view of a workstation of an open-end rotor spinning machine, with a first embodiment of a movably mounted second suction nozzle installed in the region of the winding device;

Fig.2

a side view of a workstation of an open-end rotor spinning machine, with a arranged on a movably Spulenabrollblech second suction nozzle (second embodiment),

Figure 3

a plan view of a second suction nozzle according to Fig.2 ,

In the Fig.1 Perspective shown job of an open-end rotor spinning machine is indicated overall by the reference numeral 1.

Such jobs 1 have, as known and therefore shown only schematically, inter alia, an open-end spinning device 2 for producing a thread 9, a winding device 3 for producing a cheese 8 and a workstation computer 25 for the defined control of the various work equipment of the workplace. 1

The open-end spinning device 2 has, as is known, in the region of a so-called thread withdrawal tube 21, a pivotally mounted piecing element 16, which, for example, according to a Thread break or in connection with a cheese / empty tube change accumulated on the surface of the cheese 8 and retrieved by a first suction nozzle 4 retrieved thread 9 and prepared the thread end for piecing.

The winding device 3 has, as usual, a coil frame 22 for rotatably supporting a cross-wound bobbin 8, a preferably driven by a reversible single drive 56 drive drum 23 and a Fadenchangiereinrichtung 24, which is driven for example via a stepping motor 57. In front of the thread-changing device 24, a thread-centering device in the form of a pivotally mounted centering plate 17 can also be arranged, which can be folded in the regular yarn path when required by a drive 55.

Furthermore, the workstation 1 has a thread withdrawal device 27, which takes over both the removal of the spun yarn 9 from the open-end spinning device 2 during the regular spinning operation, as well as the re-spinning for an exact return of a prepared thread end is responsible in the open-end spinning device 2.

As in Fig.1 illustrated, the drive 59 of the thread withdrawal device 27 is connected via a control line to the workstation computer 25. By way of comparable control lines, the drives 55-58 of the various other working devices of the workstation 1 are also connected to the workstations computer 25.

The workstation 1 also has, as already indicated above, a first suction nozzle 4, the mouth 19 of which is defined by means of a stepping motor 6 between a cross-wound bobbin 8 held in the region of the surface of a bobbin frame 22 lying thread receiving position and a lying in the region of the Anspinnorgans 16 of the spinning device 2 yarn transfer position is adjustable. In the exemplary embodiment, the suction nozzle 4 also carries on the back a thread catching element 7, which has, for example, an S-shaped thread guide edge, a thread catching contour and a switching plate.

At a distance before the regular yarn path of the job 1 also a stationary Fadenleiteinrichtung 5 is arranged, which has a downwardly open catch contour 10.

In the illustrated embodiment, the workstation 1 also has a thread monitor 26, a paraffining device 62 and yarn storage devices 60 and 61, respectively. The yarn storage device 61 is designed as a pressurizable storage nozzle, while the storage device 60 is formed as a mechanical yarn storage. That is, in this mechanical thread storage is arranged between two stationary Fadenleitorganen an adjustable Fadenleitorgan, which, for example, acted upon by a stepping motor 58, is arranged to be movable relative to the yarn path.

According to the invention, a movably mounted second suction nozzle 11, which may have different embodiments, is also installed in the region of the winding device 3.

The second suction nozzle 11 can either, such as in Fig.1 represented as a separately arranged, unterdruckbeaufschlagbares, tubular member may be formed, the mouth of which can be positioned as required by a drive means 13 in the region of a running onto the surface of the cheese 8 thread 9, or, in particular from Figure 3 seen Part of a so-called Spulenabrollbleches 20 be.

The Spulenabrollblech 20 is then designed and movably mounted so that the mouth of the second suction nozzle 11 can be positioned as required by a drive means 13 in the region of the running on the surface of the cheese 8 thread 9.

Regardless of the embodiment of the movably mounted second suction nozzle 11, a thread cutting device 12 is installed in the region of the mouth opening, which can be controlled via the workstation computer 25.

The second suction nozzle 11 is further connected via a pneumatic line 14, in which an electrically controllable pneumatic valve 15 is turned on, to a vacuum source 18.

In the FIGS. 2 and 3 the embodiment is shown in which the second suction nozzle 11 is part of a movably mounted Spulenabrollbleches 20.

The Fig.2 shows schematically in side view a workstation 1 of an open-end rotor spinning machine with a arranged in the region of the winding device 3 on a Spulenabrollblech 20 second suction nozzle 11 and the vacuum system.

The Fig. 3 shows a plan view of the in Fig.2 in side view shown second suction nozzle 11th

As can be seen, the suction nozzle 11 in this embodiment is part of a Spulenabrollbleches 20th

The Spulenabrollblech 20 can, as in Fig.2 indicated, if necessary, between the drive drum 23 and the cross-wound bobbin 8 are positioned and then ensures that a released from the creel 22 cross-wound bobbin 8 can be transferred to a machine-own cross-bobbin transport device.

The Spulenabrollblech 20 is also displaceable for example in the direction of the arrows V or Z by means of a drive device 13, which is designed for example as a stepper motor or as a pneumatic cylinder.

When the drive device 13, as in Fig.2 indicated as a single-acting, spring-loaded pneumatic cylinder is formed in a pneumatic line 29, via which the pneumatic cylinder is connected to a (not shown) compressed air source, preferably a 3/2-way valve 30 is turned on. The electrically switchable 3/2-way valve 30 is also connected via a control line 31 to the workstation computer 25.

The fixed at Spulenabrollblech 20 second suction nozzle 11, which is connected via a pneumatic line 14 to a vacuum source 18, is equipped in the region of its suction with a thread cutting device 12.

The thread cutting device 12 has an actuating device (not shown) and can be controlled as required by the workstation computer 25.

Like from the FIGS. 2 and 3 Furthermore, it can be seen that a 2/2-way valve 15, which is also connected to the workstation computer 25 via a control line 32, is preferably connected to the pneumatic line 14 connecting the suction nozzle 11 to the vacuum source 18.

This means that the second suction nozzle 11 can be positioned as required via the drive device 13 in the region of a running onto the surface of the cheese 8 thread 9 and pneumatically connected by appropriate actuation of the pneumatic valve 15 continuously with the vacuum source 18.

Function of the device according to the invention:

During the spinning process, the thread 9 produced in the open-end spinning device 2 is withdrawn by means of the thread withdrawal device 27 and wound on the winding device 3 to form a cross-wound bobbin 8.

The cross-wound bobbin 8 rotatably mounted between the arms of a creel 22 lies with its surface on the drive motor drum 23 which is driven by a single motor and is driven by the latter via frictional engagement in the winding direction W. At the same time the incoming thread 9 is laid by means of the Fadenchangiereinrichtung 24 so that it runs in intersecting layers on the lateral surface of the cheese 8.

As in Fig.1 1, the first suction nozzle 4 present at each workstation 1 is preferably positioned in a parked position during this "normal" spinning process.

If one of the wound on the jobs 1 open-rotor spinning machine cheeses 8 reaches its predetermined diameter D, the workstation computer 25 of the relevant job 1 ensures that the winding process is set and a cheese / empty tube change is initiated.

That is, in a first embodiment of the method according to the invention arranged in the winding unit 3, movably mounted second suction nozzle 11 is positioned by a drive means 13 directly in the yarn path of the run on the surface of the cheese 8 thread 9, the thread 9 with a Separated in the region of the mouth opening of the second suction nozzle 11 thread cutting device 12 and sucked connected to the open-end spinning device 2 yarn end of the thread 9 in the suction nozzle 11.

The second suction nozzle 11 then temporarily disposed of in the open-end spinning device 2 further produced thread 9. Subsequently, the finished cheese 8 by appropriate control of the example provided with a pivotable Spulenrahmenarm coil frame 22, for example via a Spulenabrollblech 20, to a (not shown ) transferred its own cross-wound bobbin transport device and the creel 22, preferably from a work-own Leerhülsenmägazin supplied with a new empty tube 33. That is, the workstation computer 25 of the relevant job 1 controls the creel 22 having a pivotally mounted, defined controllable Spulenrahmenarm, so that this Spulenrahmenarm pivots slightly outwards and thereby releases the cheese 8, which then on the Spulenabrollblech on a machine Cross coil removal device is transferred.

Subsequently, the open creel 22, which has, for example, a controllable by the workstation computer 25 (not shown) electric rotary actuator either swung into the area of a working empty magazine and equipped from the empty tube magazine with a new empty tube 33, or a working-own, pivotally mounted empty tube magazine is positioned in the region of the coil frame 22, that the coil frame 22 from the empty tube magazine with a new empty tube 33 can operate.

The stocked with a new empty tube 33 bobbin frame 22 is then lowered by means of its pivot drive back into the winding position in which produced by the open-end spinning device 2, previously disposed of by the suction nozzle 11 thread 9 transferred through the suction nozzle 11 to the new empty tube 33 and the winding process of a new cross-wound bobbin 8 can be started.

In a second embodiment of the method according to the invention, when one of the wound on the jobs 1 an open-end rotor spinning machine 8 reaches its predetermined diameter D, first the sliver feed to the open-end spinning device 2 of the relevant job 1 is interrupted, resulting in a yarn breakage and thus a termination of the winding process at the affected cheese 8 leads. That is, the thread end of the thread 9 runs on the surface of the cheese 8.

In this case, the workstation computer 25 first activates the first suction nozzle 4 and ensures that a new piecing thread is created. That is, the stepping motor 6 of the first suction nozzle 4 is driven so that the suction nozzle 4 pivots from its parking position to a thread receiving position (not shown) in which the suction port 19 of the suction nozzle 4 is positioned in the immediate vicinity of the surface of the cheese 8.

Furthermore, the workstation computer 25 then ensures that an associated valve (not shown) is opened and the suction nozzle 4 is pneumatically continuously connected to, for example, the vacuum source 18. Subsequently, the drive drum 23 is acted upon in the unwinding, so that the accumulated on the surface of the cheese 8 end of the thread can be absorbed by the suction nozzle 4.

The suction nozzle 4 is then pivoted by the stepping motor 6 down and passed in the region of a yarn transfer position of the recorded thread 9 to the piecing 16, which prepares the yarn end of the thread 9 and holds ready for the Wiederanspinnen.

The newly emerging in the open-end spinning device 2 thread 9 is then withdrawn via the thread withdrawal device 27 and runs on the surface of the held in the creel 22 of the winding device 3 cross cheek 8 on.

In the area of the winding device 3, the running thread 9 is then, as already explained above, expected by a second suction nozzle 11 movably mounted or by a second suction nozzle 11 arranged on a movably mounted Spulenabrollblech 20. That is, the second suction nozzle 11 or the Spulenabrollblech 20 is positioned so that a thread cutting device 12 installed in the region of the mouth of the suction nozzle 11 separate the thread 9 and the suction nozzle 11 receive the connected with the open-end spinning devices 2 part of the thread 9 and temporarily can dispose of. Subsequently, the finished cross-wound bobbin 8, as already explained above, transferred by appropriate control of the creel 22 to a cross-bobbin transport device and the creel 22 supplied from a work-own empty-tube magazine with a new empty tube 33.

The equipped with a new empty tube 33 creel 22 is then lowered into the winding position, which produced by the OffenendSpinnvorrichtung 2, previously disposed of by the suction nozzle 11 thread 9 transferred by the suction nozzle 11 to the new empty tube 33 and restarted the winding process.

Claims (12)

1. Method for operating workstations (1) of an open-end rotor spinning machine which each have an open-end spinning device (2) for producing a thread (9) and a winding device (3) for producing a cross-wound bobbin (8), wherein the winding device comprises a pivotably mounted bobbin cradle (22), a driving drum (23) chargeable by a reversible individual drive (56) and a single motor driven thread traversing device (24) and the workstations are equipped respectively with a pivotably mounted first suction nozzle (4), which can be adjusted by means of a single drive (6) between a thread take-up position in the region of a cross-wound bobbin fixed in the winding device and a thread transfer position in the region of the open-end spinning device, characterised in that the workstation (1) comprises a movably mounted second suction nozzle (11) and in that on reaching a predefinable diameter (D) of the cross-wound bobbin (8) of the workstation (1) the winding process of the cross-wound bobbin (8) is interrupted and a cross-wound bobbin/empty tube exchange is started, in which the thread (9) made by the open-end spinning device (2) is disposed of first temporarily by the second movably mounted suction nozzle (11) which can be positioned as necessary in the region of the winding device (3) of the workstation (1) by a drive device (13), transfers the cross-wound bobbin (8) by means of a suitable control of the bobbin cradle (22) onto a spinning machine-independent transport device, the bobbin cradle (22) is fitted with a new empty tube (33) from a workstationindependent empty tube magazine and lastly the bobbin cradle (22) is pivoted back into a winding position and
   in that the second movably mounted suction nozzle (11) is positioned so that the thread (9) running into the second movably mounted suction nozzle (11) is transferred to the empty tube (33) fixed in the bobbin cradle (22) and the winding process onto the new empty tube (33) is restarted.
2. Method according to claim 1, characterised in that on reaching a predefinable diameter (D) of the cross-wound bobbin (8) the movably mounted second suction nozzle (11) is positioned in the path of the thread (9) running onto the cross-wound bobbin (8), the thread (9) is cut and the thread (9) produced by the open-end spinning device (2) is taken up temporarily by the second suction nozzle (11) and disposed of.
3. Method according to claim 1, characterised in that on reaching a predefinable diameter (D) of the cross-wound bobbin (8) firstly the sliver supply to the open-end spinning device (2) is interrupted and then by means of the first suction nozzle (4) the thread end of the thread (9) that has run onto the cross-wound bobbin (8) is taken up and transferred for respinning to the open-end spinning device (2).
4. Method according to claim 3, characterised in that the movably mounted second suction nozzle (11) is positioned in the region of the path of the re-spun thread (9), the spun on thread (9) is cut and the thread (9) produced by the open-end-spinning device (2) is taken up temporarily by the second suction nozzle (11) and disposed of.
5. Workstation (1) of an open-end rotor spinning machine which has an open-end spinning device (2) for producing a thread (9) and a winding device (3) for producing a cross-wound bobbin (8), wherein the winding device has a pivotably mounted bobbin cradle (22), a driving drum (23) which can be charged by a reversible single drive (56) and a single motor drive thread traversing device (24) and the workstation is equipped with a pivotably mounted first suction nozzle (4), which can be adjusted by means of a single drive (6) between a thread take-up position in the region of a cross-wound bobbin fixed in the winding device and a thread transfer device in the region of the open-end spinning device for performing the method according to claim 1, characterised in that the workstation (1) has a movably mounted section suction nozzle (11) which can be charged if necessary with negative pressure and can be positioned by a drive device (13) in the region of the thread path of a thread (9) made by the open-end spinning device (2) and running onto the cross-wound bobbin (8), in that the thread (9) can be cut and temporary disposed of and comprises a bobbin cradle (22) which is designed and can be positioned so that it can release a finished cross-wound bobbin (8) and can take up a new empty tube (33) from an empty tube magazine.
6. Workstation according to claim 5, characterised in that the movably mounted second suction nozzle (11) can be positioned in a defined manner by means of a drive device (13) which can be controlled by the workstation computer (25).
7. Workstation according to claim 5, characterised in that the movably mounted second suction nozzle (11) is equipped in the region of its outlet opening (19) with a thread cutting device (12).
8. Workstation according to claim 5, characterised in that the movably mounted second suction nozzle (11) is connected by a valve device (12) which can be driven in a defined manner to a source of negative pressure (18).
9. Workstation according to claim 5, characterised in that the second suction nozzle (11) is a component of a bobbin rolling motion plate (20) which is designed and arranged so that the suction nozzle (11) can be positioned if necessary by a drive device (13) in the region of the thread path of a thread (9) running onto the cross-wound bobbin (8).
10. Workstation according to claim 9, characterised in that the bobbin rolling motion plate (20) can be positioned in a defined manner by means of a drive device (13) which can be controlled by a workstation computer (25).
11. Workstation according to claim 6 or 10, characterised in that the drive device (13) is designed as a pneumatic cylinder.
12. Workstation according to claim 6 or 10, characterised in that the drive device (13) is designed as a stepping motor.

Images