EP2573228B1 - Spinning machine and method for discharging an end section of a thread on a spinning machine before a subsequent spinning procedure - Google Patents

Description

The present invention relates to a spinning machine with at least one spinning station, wherein the spinning station comprises a spinning device with an input for a fiber material and an output for the yarn produced from the fiber material in the spinning device, a delivery device for the supply of the fiber material in the spinning device and a winding device for Spooling of the yarn produced. Further, a method for removing an end portion of a yarn at a spinning position of a spinning machine before a subsequent piecing process is disclosed, wherein the spinning station comprises a spinning device with an input for a fiber material and an exit for the yarn made of the fiber material in the spinning device, a delivery device for the Feeding of the fiber material into the spinning device and a winding device for winding the yarn produced, and wherein after an interruption of the spinning process, at least the discharged end portion of the yarn is unwound from the winding device.

DE-2737702 A1 shows a known prior art.

In the course of the spinning process, spinning machines (eg on rotor or air spinning machines) repeatedly come to intentional or unwanted interruptions of the yarn production. The resulting yarn ends (for example as part of a quality cut or a yarn break) are wound onto the revolving coil of a winding device. For the subsequent re-spinning of the yarn finally located on the spool yarn end, z. B. be solved with the help of a corresponding suction device, from the bobbin surface in order to be able to feed it again against the actual spinning direction of the spinning station. Furthermore, a certain portion of the yarn must be removed before re-spinning usually because the present yarn end is not usually for the Piecing process is suitable. As a result, there is finally a significant delay in the further spinning process, in particular since the finding of the thread and the subsequent removal of the end section are usually carried out by a service robot, which first has to be moved into the area of the spinning station involved.

The object of the present invention is therefore to propose a spinning machine and a method for removing an end section of a yarn on a spinning machine before a subsequent piecing process, with the help of which the piecing can be shortened compared to the prior art.

The object is achieved by a spinning machine and a method having the features of the independent claims.

According to the invention, the spinning station comprises a yarn end discharge which is arranged at least partially between the exit of the spinning device (comprising eg a spinneret or a spinning rotor) and the winding device and with the aid of which an end section of the produced yarn can be separated and removed from the remaining yarn , The removal of the yarn section which is not suitable for the piecing process can thus be carried out directly at the spinning station, specifically before a service robot or corresponding operating personnel arrives at the respective spinning station.

If there is an interruption in the spinning process, for example in the context of a quality cut (which is carried out selectively if one or more monitored yarn parameters do not correspond to the desired value) or an unplanned yarn break, the yarn can be started immediately after the interruption to make the yarn for the subsequent one Prepare piecing process. While after a yarn break it will usually be necessary to release the yarn end from the bobbin surface and then to feed it to the yarn end discharge (eg by means of a separate gripping device), opens the inventive design of the spinning unit in particular for the implementation of a quality section enormous benefits. Thus, it is in principle possible to slowly slow down the production of the yarn after the detection of a deviation of a previously defined yarn parameter. In this case, it is conceivable to gradually reduce the conveying speeds of the delivery device, the winding device and a withdrawal device, with which the yarn is withdrawn from the spinning device. After a defined reduction of the respective conveying speeds, there is finally an interruption of the yarn production, since the delivery speeds fall below corresponding minimum values which have to be observed for the yarn production. Under quality section is thus not necessarily a cutting process to understand. Rather, it is meant a termination of the spinning process, which is initiated due to irregularities of certain yarn parameters.

Will finally, z. B. by a spinning unit arranged outside the monitoring unit, the passing of the yarn end at a certain point (for example, at the output of the spinning device) detected, the said units (delivery device, winding device, take-off device) can be stopped completely. The yarn end is now at a defined position and can be fixed if necessary, for example by means of a pair of rollers of the trigger device. If the fixation finally takes place in the area of the yarn end discharge according to the invention, then the yarn end can be reliably detected by the yarn end discharge without the need for further handling means.

Subsequently, the non-compliant end portion of the yarn is unwound from the winder, and in the case of slow throttling of the delivery speeds, the end portion preferably corresponds at least to the portion produced from the start of throttling. The unwound end section can finally be wound or sucked off by the yarn end discharge, for example and finally separated and discharged accordingly (eg to the area of a central collection point).

If a service robot now enters the area of the spinning station, then a correspondingly prepared yarn end is already present which, in addition, can be fixed at a defined point, preferably in the region of an exit of the yarn end discharge. The robot therefore does not have to search for the yarn end on the surface of the winding device and unwind from it, as is customary in the prior art. Likewise, eliminating the time-consuming removal of said, unsuitable for the piecing end portion of the yarn by the robot. As a result, therefore, the time the robot needs for the piecing operation can be significantly reduced.

Furthermore, it is advantageous if the yarn end discharge comprises a suction channel, via which the end section of the yarn can be sucked in and / or the severed end section of the yarn can be discharged. The suction channel can be connected to a central vacuum source of the spinning machine. It is also grateful, of course, to equip the suction channel with its own vacuum source, for example a Venturi nozzle, which is put into operation only when a corresponding end section of a yarn is to be removed at the respective spinning station.

It is particularly advantageous if the yarn end discharge comprises a cutting unit with the aid of which the end section to be removed can be separated from the remaining yarn. In particular, when the cutting unit is integrated into the above-mentioned suction channel, a compact unit is obtained with the aid of which the end section to be removed can be both separated and removed, ie disposed of. If necessary, the cutting unit can be brought into the region of the end section of the yarn and / or switched on or off.

Alternatively, it is of course also possible to use the yarn separation device of a yarn monitoring unit ("cleaner"), which can also be configured as a cutting unit if required. The yarn separation device is in this case preferably positioned between the suction duct of the yarn end discharge and the discharge device and monitors predetermined properties or the presence of the yarn produced in the region of the yarn monitoring unit. Finally, a separate cutting device within the suction channel could be dispensed with in this embodiment.

It is further provided that the spinning station a, z. B. formed by a pair of withdrawal rollers, withdrawal device for the withdrawal of the yarn from the spinning device has; wherein the Garnendenabführung between the output of the spinning device and the trigger device is arranged. As already stated, it is fundamentally possible to purposefully shut down the spinning station for performing a so-called quality cut, until the yarn production is interrupted by the throttling of the delivery speed, in particular of the delivery device. If necessary, the resulting yarn end can be fixed between the rollers of the take-off device, wherein the fixation, d. H. the associated stop of the take-off rolls can be initiated by a sensor which monitors the presence of a yarn at a defined location after the exit of the spinning device.

The take-off rollers finally release the twine before it is eventually caught by the twine tote removal and z. B. is sucked into said suction (with appropriate reverse rotation of the coil mounted in the winding coil). Alternatively, it is also possible to fix the yarn constantly between the take-off rolls, which also turn backwards (ie counter to their direction of rotation during the actual spinning process) according to the direction of rotation of the winding device, as long as the end portion of the yarn unwound from the winding device becomes. The advantage of this lies in the fact that the yarn end is still fixed by the withdrawal device at a defined location when the end portion of the yarn is separated from the Garnendenabführung and removed. The arriving when needed robot can finally reach the yarn end targeted before the actual piecing, so that loss of time can be avoided by searching the yarn end.

Particular advantages arise when the winding device and / or the removal device (in each case) have a reversibly drivable drive unit. Even if it were sufficient for the unwinding of the yarn section to be removed to equip said units with a freewheel device, it is advantageous if an active drive is possible in contrast to the conveying direction prevailing during the spinning process. In this way, a controlled unwinding of the end portion of the yarn is possible, whereby an undefined tracking of the respective coils can be avoided.

Likewise, it brings advantages when the spinning machine has a plurality of juxtaposed spinning stations, each spinning station comprises a separate Garnendenabführung. The spinning stations are independent of each other, so that always at the spinning station at which a Wiederanspinnen should take place, the respective unsuitable for piecing end portion of the yarn can be removed.

It is particularly advantageous if the suction channel of the yarn end discharge is connected to a suction device of the delivery device. Such suction devices are usually present, for example, in the region of a drafting device forming the drafting system of an air spinning machine or an opening roller of a rotor spinning machine and are used for the removal of lint, dust or other impurities. If now the suction channel coupled with such a suction device, it can be dispensed with a separate suction device. The connection between the suction channel and the suction device of the delivery device can be done for example medium pipe sections and / or corresponding flow switches.

It is also advantageous if the suction channel is assigned a valve and / or a flow switch, with the aid of which the air pressure within the suction channel is adjustable. The suction channel can be coupled in this way with a central extraction of the spinning machine. Depending on whether at the respective spinning station finally a removal of the non-piecing suitable end portion of the yarn is necessary or not, finally the suction is subjected to a negative pressure or an air flow, which causes a suction of the yarn end. The valve or the flow switch is finally advantageously controlled by means of a corresponding control unit, which in turn may be in communication, for example, with a yarn sensor.

It is also extremely advantageous if the winding device comprises a yarn traversing device, the yarn traversing device being associated with a yarn lifting device with the aid of which the yarn can be brought out of the effective region of the yarn traversing device. By lifting the yarn can be easily prevented that it comes during the unwinding of Garnendabschnitts from the winding device to a tearing of the yarn or damage to the traversing device, as the yarn and traversing no longer touch in this period.

It is also advantageous if the Garnabhebevorrichtung comprises a lifting element, which is movable relative to the yarn, preferably by means of a pneumatic cylinder. The yarn finally passes over the lifting element and therefore can no longer come into contact with the traversing elements of the traversing unit. At the latest after the piecing process is completed, the Garnabhebevorrichtung, or the pneumatic cylinder moves back to its original position, in which the traversing elements again a traversing movement cause the yarn while it is wound by the winding device.

It is also advantageous if the lifting element extends at least over the width of the winding device. This ensures that the yarn is reliably detected by activation of the lifting element. A movement of the lifting member in the width direction of the winding device (that is, in the axial direction of an inserted coil) is therefore not necessary. The lifting element may in this case be designed, for example, rod-shaped and may be in communication with a corresponding drive element, for example the said pneumatic cylinder.

Alternatively, it can of course also be provided that the yarn traversing device used has one or more traversing elements (eg in the form of a yarn guide) which can be moved, swiveled or otherwise moved as required so that they can be brought into a position in which they no longer come into contact with the yarn when unwinding the yarn (from the winding device). For example, it would be conceivable in this context to use a so-called Flügelchangiereinrichtung. This usually has two or more counter-rotating wing elements, which come alternately in contact with the aufzuspulenden yarn and this finally when spooling back and forth accordingly. In order to prevent the traversing elements from coming into contact with the yarn during the unwinding operation (this could adversely affect the unwinding process), it may now be provided to move the respective traversing elements into a so-called unwinding position. The unwinding position is in this case a position at which the or the traversing elements can no longer come into contact with the yarn extending between the winding device and the take-off device. If the said wing elements are used, they would be rotated to a position which coincides with that of the yarn during winding contacting portions are located in an area that is outside the Garnverlaufs during unwinding.

The inventive method for discharging an end portion of a yarn on a spinning machine before a subsequent piecing process is finally characterized according to the invention in that the end portion of the yarn is unwound after an interruption of the spinning process of the winding device, and that the end portion by means of a part of the spinning station detected Garnendenabführung detected, separated from the remaining yarn and then removed from the region of the spinning station, the Garnendenabführung is at least partially disposed between the output of the spinning device and the winding device. The yarn can thus be processed individually at each spinning station accordingly, before a service robot or appropriate operating personnel who make the piecing process, have arrived at the spinning station. In addition, the yarn is after removal of the unsuitable for the piecing end portion of the yarn at a defined location, namely preferably in the range of Garnendenabführung, where it can be fixed if necessary (as mentioned above). Finally, the yarn end discharge can be designed in accordance with one or more of the features already explained, but this is not absolutely necessary.

It is particularly advantageous when the conveying speeds of the delivery device, the withdrawal device for the withdrawal of the yarn from the spinning device and the winding device are gradually reduced to their standstill before unwinding of the end portion of the yarn to be discharged. The reduction is advantageously carried out such that the end of the yarn produced after completion of the reduction between the output of the spinning station and the winding device, preferably between the output of the spinning station and the trigger device, is located. Preferably, at least a portion of the yarn end discharge (eg its suction channel) also extends into this region. That from the reduction The delivery speed resulting yarn end is in this case after the stop of the above units at a defined location and can be reliably detected by the Garnendenabführung, z. B. are sucked. Finally, the yarn already being wound on the winding device is fed backwards until the desired end section has been taken up by the yarn end discharge. Subsequently, a separation of the end portion and a disposal of the same takes place (for example, via an extraction system connected to the suction of the spinning machine). If the yarn has been clamped consistently even after the yarn has been unwound and during the removal of the end section of the yarn from corresponding take-off rolls of the take-off device, the yarn end produced by the removal of the yarn end section is finally also in the area of the take-off device. This yarn end can now be selectively grasped by a service robot or an operator and fed to the subsequent piecing process.

It is also advantageous if the discharged end portion of the yarn is sucked by means of a suction channel of Garnendenabführung and discharged after separation from the remaining yarn. Corresponding extraction ducts are known from other locations of corresponding spinning machines and can be acted upon by individual structural or control engineering measures individually with negative pressure.

It is particularly advantageous if the suction channel is assigned a valve and / or a flow switch and that the air pressure within the suction channel is regulated with the aid of the valve and / or the flow switch. Thus, the current prevailing in the flow channel air flow can be adjusted individually. An air flow is thus preferably generated only when a removal of a Garnendabschnitts is provided. In the normal spinning process, the valve is finally closed or the flow switch adjusted accordingly, to no energy-consuming air flow within the suction channel more prevails.

It is further provided that the spinning station has a withdrawal device for the withdrawal of the yarn from the spinning device, wherein the Garnendenabführung between the output of the spinning device and the take-off device takes place. Said area is usually readily accessible, so that the yarn end can be reliably detected by a robot or an operator and fed to the piecing process, in which the yarn end is connected to the fiber material coming from the delivery device, before the actual spinning process is continued.

It also brings benefits when the yarn after the separation of the end portion of the yarn using the Garnendenabführung and / or the trigger device, for. B. whose take-off roller pair is fixed until it is taken over manually or with the help of a service robot and fed to a piecing process. A search of the yarn end can be omitted in this case, so that the time required for the piecing process can be further minimized.

Likewise, it brings advantages when the discharged end portion of the yarn is unwound from a spool of the winding device by at least one drive of the spool is driven against the prevailing during the spinning process Aufspulrichtung. As a result, a controlled unwinding is possible, in which a looping or other undesirable reduction of the yarn tension can be prevented. In this case, for example, the coil can be driven directly. It is also conceivable, of course, the drive via a corresponding winding roller, which bears against the surface of the coil and provides for an indirect drive.

It is also extremely advantageous if the winding device comprises a yarn traversing device and the yarn traversing device comprises a yarn lifting device is associated with the Garnabhebevorrichtung, at least during the unwinding of the abzuführenden end portion of the yarn from the effective range of Garnchangiereinrichtung is brought. While the traversing device ensures during the spinning process that the produced yarn is deposited on the bobbin in a known manner, contact between the traversing device and the yarn during the unwinding operation is undesirable in order to avoid damage to the yarn and / or traversing device. This can be achieved in a simple manner by the said yarn lifting device in that the yarn is moved in the region of the traversing device until it no longer has any contact with the traversing device.

Figur 1

eine schematische Seitenansicht einer erfindungsgemäßen Luftspinnmaschine während des Spinnprozesses,

Figur 2

eine schematische Seitenansicht einer erfindungsgemäßen Luftspinnmaschine nach der Unterbrechung des Spinnprozesses,

Figur 3

eine schematische Seitenansicht einer erfindungsgemäßen Luftspinnmaschine während der Entfernung eines Endabschnitts des Garns,

Figur 4

eine schematische Seitenansicht einer erfindungsgemäßen Luftspinnmaschine nach der Entfernung des Endabschnitts des Garns,

Figur 5

eine schematische Seitenansicht einer weiteren erfindungsgemäßen Luftspinnmaschine,

Figur 6

den Aufspulbereich einer erfindungsgemäßen Spinnmaschine in einer Seitenansicht, und

Figur 7

den Bereich gemäß Figur 6 in einer Frontansicht.

Further advantages of the invention are described in the following exemplary embodiments. Show it:

FIG. 1

a schematic side view of an air-spinning machine according to the invention during the spinning process,

FIG. 2

a schematic side view of an air-spinning machine according to the invention after the interruption of the spinning process,

FIG. 3

a schematic side view of an air-spinning machine according to the invention during the removal of an end portion of the yarn,

FIG. 4

a schematic side view of an air-spinning machine according to the invention after the removal of the end portion of the yarn,

FIG. 5

a schematic side view of another air-spinning machine according to the invention,

FIG. 6

the Aufspulbereich a spinning machine according to the invention in a side view, and

FIG. 7

the area according to FIG. 6 in a front view.

FIG. 1 shows a schematic side view of a spinning station 1 of an air-spinning machine (as an example of a spinning machine according to the invention) during the spinning process, wherein the air-spinning machine usually comprises a plurality of perpendicular to the plane of successively arranged and preferably identically constructed spinning stations 1.

The air-spinning machine has in the in FIG. 1 shown example of a drafting device designed as a drafting device 7, which is supplied with a fiber material 4, for example in the form of a doubled stretched tape. Furthermore, the spinning unit 1 shown has a spaced apart from the delivery device 7 spinning device 2 with an input 3 for the fiber material 4 and an inner, not shown, air swirling chamber.

Finally, within the air swirling chamber, the fiber material 4 or at least a part of the fibers of the fiber material 4 is provided in a known manner with a rotation in order to produce the desired yarn 6. The rotation is produced by a targeted air flow in the region of a spindle tip, wherein the air flow is generated by air nozzles which open tangentially into the air swirl chamber.

Furthermore, the spinning station 1 shown comprises a take-off device 12 formed by a take-off roller pair and a winding device 8 connected downstream of the take-off roller pair and having a replaceable bobbin 20 for winding up the yarn 6 withdrawn from the spinning station 1 through the exit 5.

In addition, the spinning machine may be provided with a yarn monitoring unit 21 having previously defined parameters of the yarn 6 (eg, yarn thickness, yarn tenacity, or other parameters representative of the quality of the yarn 6) and / or the presence of the yarn 6 on the corresponding yarn Position monitored. The yarn monitoring unit 21 preferably operates without contact.

The device according to the invention does not necessarily have to have a drafting system, as in FIG. 1 is shown. Also, the pair of take-off rollers is not absolutely necessary. In addition, the spinning machine according to the invention may also be designed as a rotor spinning machine, wherein the spinning device 2 in this case comprises a rotor and the delivery device instead of the drafting a feed and an opening roller.

Finally, the figures next to the units already mentioned a winding roller 22, via which the coil 20 can be set in rotation. Also, there is provided a yarn traversing means 16 (eg, in the form of a blade changer) for reciprocating the yarn 6 during winding on the spool 20 in a direction perpendicular to the drawing plane, for unwinding the yarn 6 one-sidedly avoid.

The essential components of the invention and the method according to the invention will now be explained in more detail below.

In the event that with the help of the yarn monitoring unit 21 (which may also be positioned elsewhere) a defined deviation of the monitored yarn parameters or corresponding setpoints is detected or as soon as a bobbin change is pending, the conveying speeds of the delivery device 7, the discharge device 12 and Winder 8 gradually reduced. Likewise, a reduction can take place before the spinning machine is switched off.

The reduction need not be simultaneous or continuous. In any case, however, the individual conveying speeds should be throttled in such a way that the spinning process is maintained as long as possible. An uncontrolled tearing of the yarn 6 can be avoided in this way. Rather, it is the goal of reducing the conveyor speeds that the stable spinning process by falling below defined conveyor speeds come to a standstill and thus from a certain time no more yarn 6 is produced from the fiber material 4. At this point in time, it eventually comes to the desired interruption of yarn production, in which the yarn 6 dissolves from the fiber material 4 without separate force. This can be achieved, for example, by reducing the conveying speed of the delivery device 7 to such an extent that it no longer supplies a sufficient quantity of fiber material 4 in order to form a yarn 6 therefrom.

After the yarn production has been stopped, the pair of take-off rollers can be operated for a small period of time until the resulting end of the yarn 6 after the final shutdown of the delivery device 7, the take-off device 12 and the winding device 8 assumes a defined position, as in FIG. 2 is shown.

In order to be able to stop the take-off device 12 or the winding device 8 at the right time, it may be advisable to equip the spinning machine with a sensor which, for example, can be integrated in the yarn monitoring unit 21 or else positioned at a separate point. The sensor is designed to be able to detect the end of the yarn 6. If the end of the yarn 6 finally reaches the sensor, the take-off device 12 and the winding device 8 can be stopped either immediately or with a certain time delay with the aid of the corresponding control and / or regulating unit, so that the end of the yarn 6 finally between the Output 5 of the spinning station 1 and the discharge device 12 is located.

As a result, the end of the yarn 6 necessary for the piecing process is now located at a defined point between the outlet 5 of the spinning station 1 and the bobbin 20 of the winding device 8, so that the method according to the invention can be started without the end of the yarn 6 , z. B. on the surface of a coil 20 of the winding device 8, must be sought. Of course, the method according to the invention would of course also be possible with the aid of an additional yarn handling device which grips the yarn end on the bobbin surface and moves into the region of the yarn end discharge 9 described below and transfers it to it.

As from the synopsis of FIGS. 1 and 2 can be seen, the spinning unit 1 now has its own Garnendenabführung 9. This has in the illustrated embodiment, a suction channel 11, which is for example via a flow switch 15 or directly (not shown) with a portion of a suction system 23 of the spinning machine in communication. The flow switch 15 can also be coupled to the suction device 13 of the delivery device 7, as shown in the figures. By switching over the flow switch 15, it is finally possible, in the normal spinning process, to apply suction to the suction device 13 of the delivery device 7, while in the course of the removal of an end section of the yarn 6 described below (eg according to a quality cut), the suction channel 11 Suction system 23 is in communication - with simultaneous deactivation of the suction device 13 of the delivery device 7. Additionally or alternatively, it is also possible to equip the suction channel 11 with a valve 14, by means of which also a control of the air volume flow within the suction channel 11 is possible.

In any case, the suction channel 11 should be subjected to negative pressure as soon as the spinning process has ended and the yarn end in one position is located as in FIG. 2 is shown. Simultaneously or in time, the pair of rollers of the take-off device 12 and the coil 20 is now driven counter to the direction of rotation prevailing during the spinning process (see rotation arrows), so that the yarn 6 is unwound again from the reel 20 (the take-off device 12 and the winding device 8 are preferred for this purpose) Single drives on to realize the said direction reversal).

In order to prevent a collision of the yarn 6 with the Garnchangiereinrichtung 16, it is also useful to assign the Garn 6 in this area a Garnabhebevorrichtung 17, for example, over a width of the coil 20 extending Abhebeelement 18 and an associated pneumatic cylinder 19th features. How out FIG. 2 can be seen, the yarn 6 is finally moved so far against the Garnchangiereinrichtung 16 until the yarn 6 can not get into the effective range of the same (see FIGS. 2 to 4 ).

The yarn 6 is now unwound so far from the coil 20 until the unsuitable for a subsequent piecing end portion of the yarn 6 is located within the suction channel 11. The length of the yarn 6 may in this case correspond, for example, to a predetermined length, which is determined using a sensor or via the number of revolutions of the spool 20 or the rollers of the take-off device 12. If the yarn production, as described above, interrupted by throttling the delivery speeds, so it is advisable to remove at least the portion that was produced during this throttling, since the quality of which usually does not meet the requirements.

The course of the yarn 6 after sucking said end portion finally shows FIG. 3 , If the entire portion to be removed has been sucked into the suction channel 11, a separation of this portion takes place. This can be realized for example with the aid of a cutting unit 10, the For example, it may be integrated into the suction channel 11 and with the aid of which the yarn end to be removed is cut off from the remaining yarn 6.

With regard to the cutting unit 10, it is of course also possible to integrate them into the yarn monitoring unit 21. The yarn monitoring unit 21 should in this case, contrary to the arrangement as shown in the FIGS. 2 to 4 is shown between the suction channel 11 and the discharge device 12 are positioned. A corresponding arrangement shows FIG. 5 , As a result, a separate cutting unit 10 within the yarn end discharge 9 or within the suction duct 11 can be dispensed with, if necessary.

After separating the end portion of the yarn 6, the Garnendenabführung 9 is deactivated again, d. H. the valve 14 is closed, the drainage diverter adjusted in favor of the suction device 13 and / or the air flow within the suction duct 11 is interrupted by deactivation of the suction system 23.

For the final piecing process, this will be done accordingly FIG. 4 Furthermore, by the take-off device 12 fixed and released from the Garnendenabführung 9 yarn end using a service robot, a spinning mill own yarn handling device or manually and, for example, against the actual spinning direction in the spinning unit 1, between the input 3 of the spinning station 1 and the delivery device 7 or between moved adjacent pairs of rollers of the delivery device 7. There it is finally brought into contact with the fiber material 4 and reintroduced into the spinning station 1. The spinning process starts again.

Another alternative of a traversing device 16 show the FIGS. 6 and 7 , In the case shown, the traversing device 16 has two traversing elements which can be rotated in the opposite direction about a common axis of rotation 24 (other name: traversing wings) on. During the winding of the yarn 6 onto the bobbin 20 of the winding device 8, one of the two traversing elements 24 alternately comes into contact with the yarn and finally moves it (based on FIG. 7 ) from right to left (and vice versa) to ensure the desired traversing, ie the lateral movement of the yarn 6, which is additionally guided via a deflection element 25 in its movement.

If a part of the yarn 6 already wound on the reel 20 is to be unwound again (as described above) before re-starting, it is advantageous if the traversing elements 24 are brought into a position such as, for example, the substantially horizontally running traversing element 24 in FIG. 7 occupies. Since in this position a contact between the yarn 6 and the traversing elements 24 is excluded, there is also no mutual interference during the desired unwinding. As soon as yarn 6 is to be reeled onto the bobbin 20, the traversing element 24 again rotates in the opposite directions mentioned and again causes the desired oscillation of the yarn 6.

Incidentally, the invention is not limited to the illustrated embodiments. Rather, all combinations of the individual features described, as shown or described in the claims, the description and the figures and as far as a corresponding combination is technically possible or seems reasonable, the subject of the invention. Thus, the Garnabhebevorrichtung, as shown in the figures, depending on the Garnchangiereinrichtung used is not mandatory. Also, the suction channel does not have to have a valve or be coupled via a flow switch with the extraction system of the delivery device. Rather, a direct connection of the suction with a vacuum source or a corresponding flow device is possible.

LIST OF REFERENCE NUMBERS

1

spinning unit

2

spinner

3

entrance

4

fiber material

5

output

6

yarn

7

Supply means

8th

spooling device

9

Ends of yarn transfer

10

cutting unit

11

suction

12

off device

13

suction

14

Valve

15

flow switch

16

Garnchangiereinrichtung

17

Garnabhebevorrichtung

18

lifting element

19

pneumatic cylinder

20

Kitchen sink

21

Garnüberwachungseinheit

22

winding roller

23

extraction

24

Traversing element

25

deflector

Claims (13)

1. A spinning machine having at least one spinning station (1), the spinning station (1) comprising a spinning device (2) having an inlet (3) for a fiber material (4) and an outlet (5) for the yarn (6) produced from the fiber material (4) in the spinning device (2), a delivery device (7) for feeding the fiber material (4) into the spinning device (2), and a winding device (8) for winding up the produced yarn (6), and the spinning station (1) comprising a yarn end discharge (9) disposed at least partially between the outlet (5) of the spinning device (2) and the winding device (8), by means of which an end segment of the produced yarn (6) can be cut off from the remaining yarn (6) and discharged, characterized in that the spinning station (1) comprises a draw-off device (12) for drawing off the yarn (6) out of the spinning device (2), wherein the yarn end discharge (9) is disposed between the outlet (5) of the spinning device (2) and the draw-off device (12).
2. The spinning machine according to the preceding claim, characterized in that the yarn end discharge (9) comprises a suction duct (11) by means of which the end segment of the yarn (6) can be suctioned and/or the cut-off end segment of the yarn (6) can be discharged, and/or that the yarn end discharge (9) comprises a cutting unit (10) by means of which the end segment to be discharged can be cut off from the remaining yarn (6).
3. The spinning machine according to claim 2, characterized in that the spinning machine comprises a yarn monitoring device (21) for monitoring physical properties of the yarn (6), wherein the yarn monitoring device (21) comprises a yarn cutting device, and that the yarn monitoring device (21) extends at least partially between the draw-off device (12) and the suction duct (11) of the yarn end discharge (9).
4. The spinning machine according to any one or more of the preceding claims, characterized in that the winding device (8) and/or the draw-off device (12) comprises a reversibly driven drive unit.
5. The spinning machine according to any one or more of the preceding claims, characterized in that the spinning machine comprises a plurality of spinning stations (1) disposed adjacent to each other, wherein each spinning station (1) comprises a separate yarn end discharge (9).
6. The spinning machine according to any one or more of the claims 2 through 5, characterized in that the suction duct (11) of the yarn end discharge (9) is connected to a suction device (13) of the delivery device (7) and/or that a valve (14) and/or a flow deflector (15) is associated with the suction duct (11), by means of which the air pressure within the suction duct (11) can be regulated.
7. The spinning machine according to any one or more of the preceding claims, characterized in that the winding device (8) comprises a yarn traversing device (16) and that a yarn lifting device (17) is associated with the yarn traversing device (16), by means of which the yarn (6) can be brought out of the region of effect of the yarn traversing device (16), wherein the yarn lifting device (17) preferably comprises a lifting element (18) displaceable relative to the yarn (6), preferably by means of a pneumatic cylinder (19), and/or preferably extends at least across the width of the winding device (8).
8. The spinning machine according to any one or more of the preceding claims, characterized in that the winding device (8) comprises a yarn traversing device (16), wherein the yarn traversing device (16) comprises at least one traversing element (24) that can be brought into contact with the yarn (6) and can be brought into a position during unwinding of the yarn (6) from the winding device (8) in which said element does not contact the yarn.
9. A method for removing an end segment of a yarn (6) at a spinning station (1) of a spinning machine before a subsequent piecing process, the spinning station (1) comprising a spinning device (2) having an inlet (3) for a fiber material (4) and an outlet (5) for the yarn (6) produced from the fiber material (4) in the spinning device (2), a delivery device (7) for feeding the fiber material (4) into the spinning device (2), and a winding device (8) for winding up the produced yarn (6), at least the end segment of the yarn (6) to be discharged being unwound from winding device (8) after an interruption in the spinning process, the end segment being captured by means of a yarn end discharge (9) implemented as part of the spinning station (1), cut off from the remaining yarn (6), and then discharged from the region of the spinning station (1), the yarn end discharge (9) being disposed at least partially between the outlet (5) of the spinning device (2) and the winding device (8), characterized in that the spinning station (1) comprises a draw-off device (12) for drawing off the yarn (6) out of the spinning device (2), wherein the yarn end discharging takes place between the outlet (5) of the spinning device (2) and the draw-off device (12).
10. The method according to the preceding claim, characterized in that the conveying speeds of the delivery device (7), the draw-off device (12), and the winding device (8) are gradually reduced to a stop thereof before unwinding the end segment of the yarn (6) to be discharged, wherein the reducing takes place such that the end of the produced yarn is present between the outlet (5) of the spinning station (1) and the winding device (8) after the reducing is complete, preferably between the outlet (5) of the spinning station (1) and the draw-off device (12).
11. The method according to any one or more of the claims 9 and 10, characterized in that the end segment of the yarn (6) to be discharged is suctioned by means of a suction duct (11) of the yarn end discharge (9) and is discharged after being cut off from the remaining yarn (6), wherein a valve (14) and/or a flow deflector (15) is preferably associated with the suction duct (11) and the air pressure within the suction duct (11) is regulated by means of the valve (14) and/or the flow deflector (15).
12. The method according to any one or more of the claims 9 through 11, characterized in that the yarn (6) is fixed by means of the yarn end discharge (9) and/or the draw-off device (12) after cutting off the end segment, until said yarn is captured and fed to a piecing process manually or by means of a service robot.
13. The method according to any one or more of the claims 9 through 12, characterized in that the end segment of the yarn (6) to be discharged is unwound from a bobbin (20) of the winding device (8) in that at least one drive of the bobbin (20) is driven opposite the wind-up direction prevalent during the spinning process, and/or that the winding device (8) comprises a yarn traversing device (16) and a yarn lifting device (17) is associated with the yarn traversing device (16), wherein the yarn (6) is brought out of the region of effect of the yarn traversing device (16) by means of the yarn lifting device (17) at least during the unwinding of the end segment of the yarn (6) to be discharged.

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