EP3124413B1 - Method for a spinning machine and spinning machine - Google Patents

Description

The invention relates to a method on a spinning machine with a plurality of similar spinning units with a thread delivery device with delivery rollers, a thread being produced in the spinning unit and being pulled out of the spinning unit by means of delivery rollers, for delivering a thread to a spool, for laying the thread on the spool , for winding the thread onto the bobbin and for finding a thread end wound on the bobbin by means of a suction nozzle, the thread end being sucked in by means of an opening facing the bobbin circumference and serving as the suction mouth of the suction nozzle, and a corresponding textile machine with a thread delivery device, a thread traversing device, a winding device and a suction nozzle with an intake mouth.

From the EP 1 283 288 A2 a spinning device of an open-end rotor spinning machine is known. A thread is spun in an open end spinning device and delivered to a winding device. A single-motor driven thread traversing device is provided for the defined laying of the supplied thread on a bobbin. After a thread break, the resulting thread end is wound onto the spool. In order to be able to use this thread end to re-attach with a new thread, it has to be searched for on the spool. For this purpose, a swivel-mounted suction nozzle that can be pressurized is provided. In the event of a thread break, the suction nozzle swivels from a lower position up to the bobbin circumference of the bobbin and sucks it. The bobbin is rotated so that after a certain time the thread end is gripped by the suction nozzle and suctioned off. This is followed by further manipulations in order to be able to use the thread end for the reattachment. For this purpose, the thread end is transferred from the suction nozzle to other facilities. This procedure is time-consuming since the suction nozzle has to be set in motion and the thread end found must be transferred to the other handling devices by appropriate movements. In addition, the construction effort and the space required are considerable.

From the EP 0 128 121 A1 a fixed suction nozzle is known, which is assigned to a spool on a winding machine. If the thread breaks or before the thread of a new delivery bobbin is attached to the end of the thread of the thread wound on the bobbin, the bobbin is stopped. It is then turned in the direction opposite to the winding direction in order to unwind a thread end that is long enough for the piecing process from the bobbin. So that the end that is generally strongly adhering to the coil surface can be found and detached, a suction source is switched on and negative pressure is built up in the suction nozzle and propagates through the mouth to the coil surface. Due to the negative pressure, air is drawn in from the environment through the gap between the mouth lips of the nozzle. The thread end attracted by the surface of the bobbin due to the negative pressure prevailing there is now gripped by the powerful flow inside the nozzle, carried along and drawn off. It is also disadvantageous here that the thread end found must be removed from the nozzle, prepared for attachment and brought back into the normal thread path. This known device is also time-consuming in operation and accordingly disadvantageous for the efficiency of the machine.

From the EP 2 444 347 A2 a winding machine is known which guides the thread in a thread guide channel between the supply spool positioned in the unwinding position and the winding device and completely surrounds it. After the guide channel, a swiveling suction head is provided with which a thread end can be gripped on the bobbin and stretched between the bobbin and the mouth of the suction head. For further handling of the thread, it must be handed over to other handling devices. Various thread monitoring and thread treatment devices are arranged in the thread guide channel. Because of the long, stationary In the event of a blockage by the thread, thread guide channel can be very complex.

From the DE 31 21 866 A1 a method on a spinning machine and a spinning machine according to the preambles of the independent claims are known.

The object of the present invention is therefore to provide a method and a device with which a thread end can be found quickly and can be attached to a new thread quickly and without great effort, so that the production of the thread continues on a spinning machine with only a brief interruption can be.

The object is achieved with the features of the independent claims. The method according to the invention on a spinning machine with a large number of similar spinning units with a thread delivery device with delivery rollers, a thread being produced in the spinning unit and being pulled out of the spinning unit by means of delivery rollers, is used to deliver a thread to a spool, to lay the thread on the spool, for winding the thread onto the bobbin and for finding a thread end wound on the bobbin by means of a suction nozzle. The thread end is sucked in by means of an opening facing the bobbin circumference and serving as the suction mouth of the suction nozzle. In order to be able to find the end of the thread quickly on the spool in the event of a break in the thread and to have it readily available for reattachment to a new thread, it is provided that the thread is delivered to the spool, i.e. during normal production of the Fadens, runs through the suction nozzle. The thread enters the suction nozzle through a further opening serving as an entry opening for the thread and exits the suction nozzle through another opening, in particular through the suction opening. Starting from a thread delivery device, which can be a spinning station, the thread runs freely after the delivery rollers and only enters the suction nozzle immediately before the bobbin. The fact that the thread is in the suction nozzle directly in front of the bobbin during the normal delivery process means that it does not have to be applied when the thread breaks and the end of the thread is found removed from the suction nozzle, brought into another thread run and reattached, but can remain in the suction nozzle and in the thread run after the end of the thread has been found. This saves time when the thread is reattached to a new thread. This can increase the productivity of the machine and its efficiency. The fact that the thread, starting from the thread delivery device, first runs freely, ie does not run through the suction nozzle and only enters the suction nozzle directly in front of the bobbin, makes the thread very easy to handle. For example, pulling devices of the thread for pulling out of the delivery point can thereby be operated in a simple manner. The threading of the thread into the suction nozzle can also be carried out without any problems, since no long paths of the thread have to be covered in the closed suction nozzle. This reliably prevents the suction nozzle from becoming blocked. The suction nozzle is therefore relatively short. A thread path with a length of less than 80 cm, preferably less than 40 cm within the suction nozzle has proven to be particularly advantageous.

In addition, the structure of the textile machine operating according to this method is significantly simpler than in the prior art, since handling devices which remove the thread end from the suction nozzle and have to spend it in the normal thread run are not or at least not to a considerable extent required.

The thread particularly preferably runs through the inlet mouth as well as through the suction mouth of the suction nozzle during normal delivery to the bobbin. As a result, the thread can be fed into the suction mouth and the inlet mouth opposite to the delivery direction and can be moved again in the normal delivery direction after the thread has been attached without significantly changing the position.

In a particularly advantageous embodiment of the invention, the suction nozzle is connected to a suction system either via the inlet mouth or a third opening serving as a connection mouth. The suction system generates negative pressure in the suction nozzle and thereby causes the negative pressure applied to the suction opening to find the thread end on the circumference of the bobbin when the bobbin moves along the suction opening, in particular against the normal winding direction. The connection of the suction nozzle to the suction system is particularly good via the already existing inlet mouth. In another embodiment of the invention, however, it can also be advantageous that a third opening is arranged on the suction nozzle and is connected to the suction system. At this point, the extraction system can be permanently connected and there is no need to move the vacuum-carrying components.

If the inlet mouth is closed to seal the suction nozzle when the thread end is sucked in, the vacuum at the suction mouth is increased in a particularly advantageous manner. This prevents suction losses through the inlet mouth.

If the inlet mouth is connected to the suction system via a connecting element when the thread end is sucked in, then in this embodiment of the invention the essential, vacuum-guiding component is firmly arranged in the machine. Only the connecting element has to be moved. This can be done quickly and without great structural effort.

If the suction mouth of the suction nozzle is adjusted in at least two, preferably three positions with a different distance from the coil circumference, various conditions can be optimally dealt with. In particular, the special requirements during normal delivery operation of the thread, searching for the thread or, if required, for special handling of the thread, for example for lifting the thread from a traversing thread guide, can be used. Through the different positions the suction opening in relation to the bobbin circumference, the thread end can be found very quickly and the thread end can be handled for reattachment.

It is particularly advantageous if the movement of the adjustable suction mouth is coupled to a thread lifter and / or to a thread guide of the thread traversing device. This coupling can take place mechanically or by means of an electronic control. The coupling can be such that the thread lifter lifts the thread out of the thread guide at a certain position of the suction mouth, so that it no longer oscillates on the surface of the bobbin and / or that the thread guide of the thread traversing device is caused to move out of the Area of the coil or the suction mouth moved out so that the movement of the suction mouth is not in the way.

It is particularly advantageous if the suction mouth is arranged in the first, in particular middle position of the suction mouth when the thread is wound onto the bobbin during normal delivery. In this first position, the suction mouth is positioned so that it does not prevent the thread from running. It is neither too close to the bobbin, where it could hinder the winding of the thread on the bobbin, nor is it pulled back too far to prevent the thread running in the suction nozzle.

In the second, in particular closer position of the suction mouth, the thread end on the bobbin is sought through the suction mouth. The suction mouth is thus in the immediate vicinity of the coil circumference and can exert a particularly high suction force on the surface of the coil.

If the second position of the intake opening is set as a function of the bobbin diameter and / or the thread to be picked up, it can the thread end can be found and picked up very quickly and safely.

In the third, in particular more distant position of the suction mouth, a thread lifter is actuated. The thread lifter causes the thread to be lifted or held out of the thread traversing device. In this position, the thread guide can be moved out of the area of the suction mouth so as not to impede the handling of the thread. This position is particularly advantageous if the thread is in the suction nozzle but should not be changed.

A spinning machine according to the invention with a large number of similar spinning units has, that is to say per work station, a thread delivery device with delivery rollers for delivering a thread to a bobbin, a thread traversing device for laying the thread on the bobbin, a bobbin winding device for winding the thread onto the bobbin and a suction nozzle to find a thread end wound on the bobbin. The suction nozzle also has an opening facing the bobbin circumference and serving as a suction opening for sucking in the thread end. The suction nozzle can be stationary or movable. However, it is preferably attached to the work station in a stationary manner. According to the invention, the suction nozzle has, in addition to the suction opening, a further opening serving as the entry opening for the thread, the thread running through the suction nozzle during delivery to the bobbin. The thread enters the suction nozzle through the inlet mouth and exits the suction nozzle through another opening, in particular the suction mouth. The suction nozzle thus has at least two different openings through which the thread runs during delivery to the bobbin. Thus, the difference of the thread run in the normal delivery is not or only slightly different in comparison to the position of the thread when the end of the thread is found and when it is sucked into the suction nozzle. The handle of the thread end for use when reattaching the thread to one new thread is particularly easy to carry out. As a result, the thread can be handled very quickly and easily. The construction effort can also be kept low. According to the invention, it is particularly advantageous for handling the thread if the suction nozzle is arranged after the delivery rollers and in front of the bobbin in such a way that the thread runs freely from the thread delivery device and only enters the suction nozzle directly in front of the bobbin. A thread run with a length of less than 80 cm, preferably less than 40 cm within the suction nozzle has proven to be particularly advantageous in order to avoid clogging of the suction nozzle and to leave enough space, for example, for the thread take-off device or a thread connecting device to be manual or to be able to operate with appropriate handling devices.

It is particularly advantageous if the suction nozzle is arranged stationary at the work place. As a result, movement of the suction nozzle itself is not necessary. This makes it particularly easy to set up the suction nozzle and attach it to the work station.

The suction nozzle is advantageously designed in such a way that it can be connected to a suction system via the inlet opening or a third opening serving as a connection opening. When connecting the suction system to the inlet mouth, the construction effort is to be kept very low. However, with such an embodiment there is a risk that the installation space which is available at this point is small, so that the arrangement of the connection of the suction nozzle to the suction system can be problematic at this point. The arrangement of the extraction system via a third opening on the suction nozzle, which serves as a connection mouth, is simpler. This opening can be arranged in an area of the suction nozzle where more space is available. This makes it easy to carry out this variant of the invention.

In a preferred embodiment of the invention, a closure element is assigned to the inlet mouth. The closure element serves to seal the suction nozzle when the thread end is sucked in. This version, which will be provided in particular in connection with a third opening serving as a connection opening to an extraction system, serves to ensure that the negative pressure at the suction opening is high and is not weakened by further openings which are not required at the moment. Finding the end of the thread with a high vacuum at the intake opening is usually faster and more reliable than with a low vacuum.

If a connecting element is assigned to the inlet mouth for connecting the suction nozzle to the suction system when the thread end is being sucked in, then both the suction nozzle and the suction system and the corresponding suction pipe connections can be arranged stationary at the work station. The connecting element enables the suction nozzle to be connected to the vacuum of the extraction system.

The connecting element and or the closure element for the inlet mouth is preferably pivotally or displaceably mounted. The connection of the suction nozzle to the suction system or the closing of the inlet mouth that is not required at this moment can be carried out very easily.

If the suction mouth of the suction nozzle is adjustable, in particular displaceable, the suction mouth can be brought into different positions with respect to the coil circumference of the coil. In this way, a negative pressure can be generated in a targeted manner on the surface of the bobbin or the suction mouth can be moved out of an area that disturbs the thread end.

If the adjustable suction mouth is coupled to a thread lifter and / or to a thread guide of the thread traversing, the movement can a movement of the thread lifter or the thread guide can be brought about in the suction mouth. In particular, the coupling of the suction mouth and thread lifter can be carried out by means of a link guide. Through the movement of the suction mouth, the thread lifter is guided along this backdrop and can carry out corresponding movements, in particular lifting or lowering the thread from the thread guide.

The thread guide of the thread traversing device can be moved out of the area of the suction mouth with a corresponding position of the suction mouth. This is preferably done by means of an electronic circuit which, in a certain state of the machine, causes the thread guide to be moved out of the critical area. This is particularly advantageous if the thread traversing device and or the winding device have individual drives. By means of these individual drives, the individual work station can carry out a specific movement of the thread traversing device or the winding device that is required at the moment, independently of the other work stations.

Figur 1

eine schematische Darstellung einer Arbeitsstelle bei Lieferung eines Fadens,

Figur 2

die Arbeitsstelle aus Figur 1 bei Rücklieferung des Fadens,

Figur 3

eine schematische Darstellung einer Arbeitsstelle mit einer Saugdüse, mit drei Mündungen, bei Lieferung eines Fadens,

Figur 4

die Arbeitsstelle aus Figur 3 beim Rücklieferung des Fadens,

Figur 5

eine schematische Darstellung einer Ansaugmündung bei Lieferung eines Fadens,

Figur 6

die Ansaugmündung aus Figur 5 mit angehobenem Faden,

Figur 7

die Ansaugmündung aus Figur 5 in Faden-Suchstellung,

Figur 8a

eine Kulissenführung eines Fadenhebers in Normalstellung,

Figur 8b

die Kulissenführung aus Figur 8a bei zurückgezogener Kulisse und angehobenem Fadenheber und

Figur 8c

die Kulissenführung aus Figur 8a in vorderer Position mit abgesenktem Fadenheber.

Further advantages of the invention are described in the following exemplary embodiments. It shows:

Figure 1

1 shows a schematic representation of a job when a thread is delivered,

Figure 2

the job Figure 1 when the thread is returned,

Figure 3

1 shows a schematic representation of a work station with a suction nozzle, with three mouths, when a thread is supplied,

Figure 4

the job Figure 3 when the thread is returned,

Figure 5

1 shows a schematic representation of an intake mouth when a thread is supplied,

Figure 6

the intake mouth Figure 5 with thread raised,

Figure 7

the intake mouth Figure 5 in thread search position,

Figure 8a

a guide of a thread lifter in normal position,

Figure 8b

the backdrop tour Figure 8a with the backdrop withdrawn and the thread lifter raised and

Figure 8c

the backdrop tour Figure 8a in the front position with the thread lifter lowered.

In Figure 1 A work station 1 with a spinning unit 2, a thread delivery device 3, a suction nozzle 4, a thread traversing device 5 and a winding device 6 is shown. A thread 7 is produced in the spinning unit 2 and drawn off from the spinning unit 2 by means of delivery rollers 8. The thread 7 then, after it has run freely up to this point, passes directly in front of a bobbin 12 of the bobbin 6 through an inlet mouth 9 into the suction nozzle 4 and emerges from the suction mouth 10 again. The thread 7 is wound onto the spool 12 by means of a thread guide 11 which is moved back and forth by the thread traversing device 5 arranged between the suction mouth 10 of the suction nozzle 4 and the winding device 6. The bobbin 12 rotates in the direction of the arrow in order to be able to wind the thread 7. The bobbin 12 is held in a bobbin arm 14 and driven by a rotating bobbin roller 13. Because the thread 7 runs freely over a long distance, it can be easily inserted between the delivery rollers 8 or inserted into the spinning unit 2 when the thread 7 is attached.

A connection mouth 15 of a suction line 16 is arranged in the area of the inlet mouth 9. The suction line 16 is connected to a suction system 17 in which there is negative pressure. The suction line 16 can be shut off by means of a valve 18, so that negative pressure is present at the connection mouth 15 of the suction line 16 only when required.

The suction nozzle 4 with the inlet mouth 9 and the suction line 16 with the connection mouth 15 are designed separately from one another. While the thread 7 is being delivered to the bobbin 12, the thread 7 runs past the connection mouth 15 and into the inlet mouth 9 into the suction nozzle 4. A connecting element 19, which is able to connect the inlet mouth 9 to the connection mouth 15, is arranged laterally offset from the thread run, so that the thread 7 is not hindered.

In Figure 2 is the job of the Figure 1 shown. In contrast to the representation of the Figure 1 is at Figure 2 the thread 7 is returned from the bobbin 12. The thread 7 was previously interrupted, so that the thread end was wound on the spool 12. In order to be able to find and pick up the thread 7 or its thread end on the surface of the bobbin 12, the suction mouth 10 of the suction nozzle 4 is vacuumed. The suction is carried out in such a way that the connecting element 19 connects the inlet mouth 9 to the connection mouth 15. When the valve 18 is opened, there is negative pressure in the suction nozzle 4 via the suction line 16 from the suction system 17. The connecting element 19 thus creates a continuous suction channel, which consists of the suction nozzle 4, the connecting element 19 and the suction line 16. After being found on the circumference of the bobbin 12, the thread 7 is sucked into this suction channel and can then be treated further. A treatment can consist, for example, in that the thread 7 is cut to length and the resulting thread end is prepared for re-spinning in the spinning unit 2.

By removing the connecting element 19 and thus opening the suction nozzle 4 again, the thread end clamped by the negative pressure can be grasped by an operator or a handling device and removed from the channel for further treatment.

Figure 3 shows a further job 1, which is similar to job 1 of the Figure 1 is. In contrast to the execution of the Figure 1 however, it has a suction nozzle 4 which has three openings. In addition to the inlet mouth 9 and the suction mouth 10, the connection mouth 15 is integrated in the suction nozzle 4. A connection of the inlet mouth 9 and the connecting mouth 15 as in Figure 1 is accordingly not necessary. In normal thread travel - when the thread 7 is supplied - the thread 7, as also described above, enters the suction nozzle 4 through the inlet mouth 9 and leaves it again through the suction mouth 10 before it is wound on the spool 12 rotating in the direction of the arrow , A closure element 28 is assigned to the inlet mouth 9. When the thread 7 is supplied, the closure element 28 is located outside the thread run so as not to disturb it. The suction line 16 can be shut off.

In Figure 4 is analogous to Figure 2 at a job 1 according to Figure 3 the return delivery of the thread 7 or the thread end shown. The spool 12 rotates in the direction of the arrow against the winding direction. The thread end was previously grasped by the suction mouth 10 of the suction nozzle 4 and suctioned off by the vacuum of the suction system 17 when the valve 18 was open. In order to generate the highest possible negative pressure at the intake mouth 10, the inlet mouth 9 is shut off by means of the closure element 28. The thread 7 is thus located in a substantially closed suction channel, which is formed from the suction nozzle 4, the closure element 28 and the suction line 16. The connection mouth 15 is part of the suction nozzle 4.

In Figure 5 the suction nozzle 4 with the suction mouth 10 is shown in detail. The thread guide 11 of the thread traversing device 5 is arranged between the suction mouth 10 and the spool 12 or the winding roller 13, which drives the spool 12. The thread guide 11 moves the thread 7 back and forth in front of the bobbin 12, so that a cheese is formed. A thread lifter 20 is arranged below the thread 7, between the suction mouth 10 and the thread guide 11. In this illustration, which shows the delivery of the thread 7, the thread 7 runs over the thread lifter 20.

The thread 7 is detected in the suction nozzle 4 by a sensor 22. This sensor 22 can be active, for example, during normal thread delivery. However, it is more advantageous if the sensor 22 is used to recognize whether the thread 7 has been picked up by the suction nozzle 4 when it is returned from the bobbin 12.

The thread 7 exits the suction nozzle 4 at the suction mouth 10. The suction mouth 10 is arranged in a mouthpiece 21, which is located in the suction nozzle 4. It can also be arranged entirely or partially outside the suction nozzle 4. The mouthpiece 21 is slidably mounted in the suction nozzle 4. The displacement takes place essentially in the longitudinal direction of the thread, so that the mouthpiece 21 can be brought more or less close to the bobbin 12.

With the mouthpiece 21 is, as in Figure 6 shown, the thread lifter 20 coupled. In Figure 6 is the mouthpiece 21 compared to Figure 4 further away from the coil 12. It is thus pushed further into the suction nozzle 4. The mouthpiece 21 or the suction mouth 10 is thus in a second position, which is further away from the coil 12 than in the first position Figure 5 ,

The thread positioner 20 has been moved into a raised position by the second position of the mouthpiece 21 or the suction mouth 10. The In this position, thread lifter 20 reaches under thread 7 and lifts it out of thread guide 11. The thread guide 11 is thus no longer able to oscillate the thread 7 back and forth. This position is advantageous when the thread 7 is in the suction nozzle 4, but winding on the bobbin 12 is not intended. This can bring advantages, for example, when the thread 7 is stopped in a controlled manner. Another situation in which this position of the thread 7 outside the thread guide 11 is desired is, for example, when the thread 7 previously interrupted is re-spun.

In Figure 7 A third position of the intake mouth 10 is shown. In this position, the suction mouth 10 is very close to the surface of the coil 12. The mouthpiece 21 is almost completely extended from the suction nozzle 4. The thread lifter 20 is in a lower position, so that the mouthpiece 21 can be moved over it. In order to avoid a collision with the thread guide 11, the thread guide 11 has been moved out of the area of the mouthpiece 21 by means of the thread traversing device 5. The thread guide 11 is accordingly located to the side of the mouthpiece 21. By applying suction to the suction nozzle 4 with negative pressure according to the explanations according to FIGS Figures 1 to 4 there is negative pressure at the suction mouth 10, which sucks a thread end located on the circumference of the bobbin 12. The bobbin 12 rotates in the direction of the arrow against the delivery direction and thus conveys the end of the thread into the suction nozzle 4. The sensor 22 detects whether the thread end is in the suction nozzle 4 and can accordingly stop the suction or initiate further handling steps.

In the Figures 8a, 8b and 8c is a backdrop 23 for the thread lifter 20 in the three positions described above. The setting 23 is connected to the mouthpiece 21 and is moved together with the mouthpiece 21 in the longitudinal direction. It has a sliding guide 24 in which a sliding block 25 slides. The thread lifter 20 is via a linkage 26 connected to an axis of rotation 27 and the sliding block 25. Through the movement of the link 23 in the longitudinal direction, the link block 25 is moved in the link guide 24 and raises or lowers the thread lifter 20 accordingly.

In the representation of the Figure 8a the thread lifter 20 is in a middle position. Accordingly, the backdrop 23 is in a middle position, which is the representation of the Figure 5 corresponds with the corresponding mouthpiece 21.

According to the mouthpiece 21 together with the backdrop 23 in the removed position Figure 6 or 8b moves, the link guide 24 causes the link block 25 to be guided downward. As a result, the thread lifter 20 lifts up in accordance with Figure 6 to lift the thread 7 out of the thread guide 11.

In Figure 8c is the front position of the backdrop 23 or the mouthpiece 21 from Figure 7 shown. In this position, the sliding block 25 is located at the other end of the sliding guide 24. The thread lifter 20 is moved into a lower position via the axis of rotation 27, so that it clears the way for the mouthpiece 21 and the mouthpiece 21 in the forward position near the spool can be moved.

The present invention is not limited to the exemplary embodiments shown and described. Modifications within the scope of the claims are possible as well as a combination of the features, even if these are shown and described in different exemplary embodiments.

LIST OF REFERENCE NUMBERS

1

place of work

2

spinning unit

3

Thread feed

4

suction nozzle

5

Thread traversing device

6

winding device

7

thread

8th

delivery rollers

9

inlet opening

10

suction port

11

yarn guide

12

Kitchen sink

13

winding roller

14

Spularm

15

connection mouth

16

suction

17

extraction

18

Valve

19

connecting element

20

thread lifting

21

mouthpiece

22

sensor

23

scenery

24

link guide

25

sliding block

26

linkage

27

axis of rotation

28

closure element

Claims (16)

1. Method on a textile machine with multiple similar spinning units (2) with a thread delivery device having delivery rollers (8),
   wherein the thread (7) is produced within the spinning unit (2) and is drawn out of the spinning unit (2) by means of the delivery rollers (8),
   for delivering the thread (7) to a bobbin (12),
   for laying the thread (7) onto the bobbin (12),
   for winding the thread (7) onto the bobbin (12) and
   for finding a thread end wound on the bobbin (12) by means of a suction nozzle (4),
   wherein the thread end is sucked in by means of an opening turned towards the bobbin circumference that serves as an extraction mouth (10) of the suction nozzle (4),
   characterized in that,
   the thread (7) runs through the suction nozzle (4) during the delivery to the bobbin (12), i.e. during normal production of the thread, wherein it enters through another opening in the suction nozzle (4) serving as an inlet mouth (9) for the thread (7) and exits the suction nozzle (4) through another opening, in particular through the extraction mouth (10), wherein the thread (7) runs, initially freely after the delivery roller (8) and only enters the suction nozzle (4) directly in front of the bobbin (12).
2. Method according to the previous claim, characterized in that the suction nozzle (4) is connected to an extraction system (17) through the inlet mouth (9) or a third opening serving as a connection mouth (15).
3. Method according to one more of the previous claims, characterized in that the inlet mouth (9) is closed for sealing the suction nozzle (4) upon the sucking in of the thread end.
4. Method according to claim 2, characterized in that , upon the sucking in of the thread end, the inlet mouth (9) is connected to the extraction system (17) through a connection element (19).
5. Method according to one more of the previous claims, characterized in that the extraction opening (10) of the suction nozzle (4) can be adjusted in at least a first and a second, preferably additionally in a third, position at different distances from the bobbin circumference in each case.
6. Method according to claim 5, characterized in that the movement of the adjustable extraction mouth (10) is coupled with a thread lifter (20) and/or with a thread guide (11) of the thread traversing device (5).
7. Method according to claim 6, characterized in that the thread (7) runs through the suction nozzle (4) during the delivery to the bobbin (12) and the extraction mouth (10) is herein arranged in particular in the first, in particular the middle, position, that, in the second, in particular closer, position of the extraction mouth (10), the thread end is sought on the bobbin (12) by the extraction mouth (10) and/or that, in the third, in particular more distant, position of the extraction mouth (10), the thread lifter (20) is actuated, for lifting the thread (7) from the thread traversing device (5).
8. Method according to one more of the previous claims 5 to 7, characterized in that the second position of the extraction mouth (10) is adjusted as a function of the bobbin diameter and/or the thread (7) to be received.
9. Spinning machine with multiple similar spinning units, in each case with a thread delivery device having delivery rollers (8) for delivering a thread (7) to a bobbin (12),
   a thread traversing device for laying the thread (7) onto the bobbin (12),
   a winding device for winding the thread (7) onto the bobbin (12) and
   a suction nozzle (4) for finding a thread end wound onto the bobbin (12),
   wherein the suction nozzle (4) features an opening turned towards the bobbin circumference that serves as an extraction mouth (10) for sucking in the thread end,
   characterized in that,
   the suction nozzle (4) features another opening serving as an inlet mouth (9) for the thread (7), and the thread (7) runs through the suction nozzle (4) during the delivery to the bobbin (12) i.e. during normal production of the thread, wherein it enters the suction nozzle (4) through the inlet mouth (9), and exits the suction nozzle (4) through another opening, in particular the extraction mouth (10), and
   the suction nozzle (4) is arranged after the delivery rollers (8) and in front of the bobbin (12), such that the thread (7), initially runs free, and only enters the suction nozzle (4) directly in front of the bobbin (12).
10. Spinning machine according to the previous claim, characterized in that the suction nozzle (4) is arranged at the workstation (1) in a stationary manner.
11. Spinning machine according to claim 9 or 10, characterized in that the suction nozzle (4) is connected to an extraction system (17) through the inlet mouth (9) or a third opening serving as a connection mouth (15).
12. Spinning machine according to one or more of the previous claims 9 to 11, characterized in that a closing element (28) is allocated to the inlet mouth (9) for sealing the suction nozzle (4) upon the sucking in of the thread end.
13. Spinning machine according to claim 11, characterized in that a connection element (19) that is in particular mounted in a swiveling or displaceable manner is allocated to the inlet mouth (9), for connecting the suction nozzle (4) with the extraction system (17) upon the sucking in of the thread end.
14. Spinning machine according to one or more of the previous claims 9 to 13, characterized in that the extraction mouth (10) of the suction nozzle (4) is adjustable, in particular displaceable, preferably in at least two, preferably three, positions.
15. Spinning machine according to claim 14, characterized in that the adjustable extraction mouth (10) is coupled with a thread lifter (20) and/or with a thread guide (11) of the thread traversing device (5).
16. Spinning machine according to one or more of the previous claims 9 to 15, characterized in that the thread traversing device (5) and/or the winding device (6) feature individual drives.

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