EP2831319A1

EP2831319A1 - Slubbing machine with an arrangement for detecting and removing yarn flaws

Info

Publication number: EP2831319A1
Application number: EP13712715.5A
Authority: EP
Inventors: Gerd Stahlecker; Rudolf HÄRDI
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 2012-03-29
Filing date: 2013-03-15
Publication date: 2015-02-04
Also published as: JP2015513009A; US20150082766A1; IN2014DN08655A; WO2013143874A1; DE102012102695A1; CN104204318A

Abstract

The invention relates to a slubbing machine for producing a rove (1) from a fibre web (2), wherein the slubbing machine has at least one spinning nozzle (3) with an inlet opening (4) for the fibre web (2), wherein the spinning nozzle (3) is assigned at least one air nozzle through which the air can be channelled into the spinning nozzle (3) in order to impart a protective rotation to the fibre web (2) within the spinning nozzle (3), wherein the spinning nozzle (3) has an outlet (5) through which the rove (1) can be drawn out of the spinning nozzle (3), and wherein the slubbing machine comprises at least one receiving device (28) arranged downstream of the spinning nozzle (3) in the transport direction of the rove (1), particularly in the form of a winding device (6) to receive the rove (1) leaving the spinning nozzle (3). The invention proposes that the slubbing machine comprises an arrangement (7), to be passed by the rove (1), for detecting and removing yarn flaws (8), the arrangement (7) being placed between the outlet (5) of the spinning nozzle (3) and the receiving device (28). The invention further discloses a method for producing a rove (1) from a fibre web (2) using a slubbing machine, which is characterised in that, after leaving a spinning nozzle (3), the rove (1) passes an arrangement (7) for detection and removal of yarn flaws (8), which is placed between the outlet (5) of the spinning nozzle (3) and a receiving device (28), wherein by means of the arrangement (7), yarn flaws (8) are detected upstream of where the rove (1) is received, and are removed from the rove (1).

Description

Roving machine with an arrangement for detection

and removal of yarn defects

The present invention relates to a roving machine for producing a roving from a fiber structure, wherein the roving has at least one spinneret with an inlet opening for the fiber structure, wherein the spinneret is associated with at least one air nozzle, through the air in the spinneret is conductive to the fiber structure within the spinneret to give a protective rotation, wherein the spinneret has an outlet through which the roving is removable from the spinneret, and wherein the roving at least one of the spinneret in the transport direction of the roving subordinate transfer device, in particular in the form of a winding device, to take over the spinneret leaving roving. In addition, a method for producing a roving from a fiber structure by means of a roving is proposed, wherein the fiber structure is introduced via an inlet opening in a spinneret, wherein the fiber structure within the spinneret by means of a flow of air is given a protective rotation, wherein the roving over a Outlet is withdrawn from the spinneret, and wherein the roving leaving the spinneret with the help of one of the spinneret in the transport direction of the roving downstream transfer device, such as a winding device, is accepted.

The production of roving (sliver) with the aid of a generic roving is already known. In principle, a fiber structure supplied to the spinneret is exposed to a targeted air flow in a swirl chamber of the spinneret. The air flow is directed to the fiber structure in such a way that the outer ends of the fibers forming the fiber structure are pulled a little way out of the dressing and finally wound around the remaining, untwisted core region of the fiber structure. This gives a roving which, despite the opposite increased strength over the fiber structure still has a certain delaying ability, so that it can be warped in a subsequent textile machine (for example, a ring spinning machine) by means of a drafting, that can be evened out.

A disadvantage of such a roving production is the fact that yarn defects (i.e., portions of the roving whose physical parameters such as diameter, length-related weight, density, strength, etc. are outside defined limits) can not be excluded. However, such defects represent a flaw of the roving, which can not be completely eliminated even with the help of a drafting system of the subsequent textile machine.

The object of the present invention is to propose a roving machine or a method for producing a roving, with the aid of which a roving of as high quality as possible can be produced.

The object is achieved by a roving and a method with the features of the independent claims.

According to the invention, it is proposed that the roving machine comprises an arrangement for detecting and removing yarn defects to be passed through the roving, the arrangement being placed between the outlet of the spinneret producing the roving and the transfer device downstream of the spinneret in the conveying direction. The transfer device may be formed, for example, as a winding device, by means of which the withdrawn from the spinneret roving can be wound on a spool to be able to perform it at a later time a downstream textile machine. Alternatively, it is also conceivable to form the transfer device as an intermediate member, which feeds the produced roving without an intermediate winding directly to the downstream textile machine. In this case is For example, it is conceivable to design the transfer device as a (preferably driven or drivable) roller pair, with the aid of which the roving can be grasped and selectively fed to its further use.

In any case, the invention provides that the device for detecting and removing a yarn defect is associated with the roving machine, so that yarn defects can be removed immediately after production of the roving on the roving machine itself (if the roving machine has several spinnerets, it is advantageous if each spinnerette is associated with a separate yarn error detection and removal device). A subsequent rewinding for the purpose of Garnfehlerentfernung is therefore no longer necessary. Rather, the roving provides a perfect roving, which can be further processed without further intermediate steps.

For detecting the yarn defect, optical sensors or ultrasound, microwave or other sensors suitable for detecting a yarn defect can be used. The sensors are preferably connected to a controller which may also be connected to the driven components of the roving frame or their drives described in more detail below in order to regulate the respective speeds or conveying speeds.

It is advantageous if the arrangement comprises, in addition to a device for detection and a device for removing the yarn defect, a yarn store for temporarily storing the roving leaving the spinneret during the removal of the yarn defect. The yarn store is preferably placed between the outlet of the spinneret and the apparatus for removing the yarn defect. By way of example, the yarn store has a drivable bobbin around which the roving is wound several times starting from a first end face, and in which rich second end side is withdrawn again. When the bobbin rotates at a peripheral speed corresponding to the delivery speed of the spinneret, the fill level of the yarn store remains constant (the amount of roving picked up by the yarn store corresponds to the amount of roving returned). If a yarn defect in the roving is detected by the device for detecting a yarn defect, the transfer device (eg in the form of the aforementioned winding device) is stopped, so that the section with the yarn defect comes to a standstill in the device for removing the yarn defect, and the yarn error can be removed from the yarn. The yarn storage makes it possible in this case that the spinneret continues to produce roving, which can now be temporarily stored in the yarn storage. After removal of the yarn defect and the connection of the yarn ends resulting from the removal, the transfer device is put back into operation. If the takeover speed is chosen to be so high that more yarn is taken over than is produced by the spinneret, the yarn store empties gradually. After reaching a defined level, the takeover speed can again be adapted to the production or delivery speed of the spinneret, so that the fill level of the yarn store remains constant again.

In addition, it is advantageous if the yarn store is placed between the device for detecting a yarn defect and the device for removing the yarn defect. In this case, the device for detecting the yarn defect can be arranged, for example, immediately after the outlet of the spinneret, so that a yarn defect can be detected as early as possible. The take-over speed (ie, the amount of roving taken over by the transfer device) can thereby be smoothly reduced to zero, since the portion of the roving having the yarn defect still has to pass a certain distance until it stops inside the device for removing the yarn defect comes. It is also advantageous if a first conveying device for the roving is arranged between the outlet of the spinneret and the yarn store, and a second conveying device for the roving is arranged between the yarn store and the device for removing the yarn defect. In particular, it is advantageous in this case if the conveying speed of the second conveying device can be regulated independently of the conveying speed of the first conveying device. Namely, if a yarn defect is to be removed in the device for removing the yarn defect, the second conveying device can be stopped while the first conveying device further draws roving from the spinneret and delivers it to the yarn storage. If required, the two conveying devices can be designed, for example, as a pair of rollers, wherein the roving passes through the pair of rollers between the respective corresponding rollers and, at the same time, can be clamped by them.

It also brings advantages when the yarn storage is placed between the first conveyor and the second conveyor. The first conveyor serves to deduct the roving before, during and after the removal of a yarn defect, while the second, the yarn storage downstream conveyor used in their stoppage serves to fix the roving locally and the yarn defect while in the device for removing the yarn defect hold.

In general, it should be noted at this point that the apparatus for removing the yarn defect preferably has a cutting or separating unit, with the aid of which the roving is severable before and after the yarn defect. In addition, a device is additionally integrated, with the aid of which the yarn ends resulting from the separation of the yarn defect can be connected to one another again. Conceivable, for example, the connection by rubbing, needle or calendering operations. It is also possible to use air nozzles, which accomplish the connection by means of a targeted air flow. Particular advantages arise when a pneumatic yarn storage is used, which is designed to suck the roving produced during the removal of the yarn defect in a recess. The prevailing in the depression vacuum can be preferably controlled. It is also conceivable a constant negative pressure, so that always the (otherwise sagging) portion of the withdrawn from the spinneret roving, which is not taken over by the transfer device (for example, because a yarn defect is removed) is sucked from the yarn storage in the recess. The recess may have a screen on which the roving is deposited, wherein the screen delimits the recess of a subsequent vacuum line.

It is also advantageous if the roving machine comprises a controller which is designed to continue to operate the first conveying device during the removal of the yarn defect and to interrupt the conveying of the roving with the aid of the second conveying device. The preparation of the roving can in this case be carried out continuously, even if the roving leaving the spinneret has a yarn defect which must be removed from the roving. If the second conveying device is stopped, the roving drawn off from the first conveying device is temporarily stored in the yarn store. After removing the yarn error, the second conveyor and with it the transfer device with the help of the control is put back into operation.

It is advantageous if the roving machine comprises a controller which is designed to stop the takeover of the roving during the removal of the yarn defect carried out with the aid of the transfer device and to continue again after the removal of the yarn defect. The roving can be freed in this case in the apparatus for removing a yarn defect from existing yarn defects, without causing an undesirable crack of the roving after said device. It is also advantageous if the roving passes after leaving the spinneret placed between the outlet of the spinneret and the transfer device arrangement for the detection and removal of yarn defects, with the aid of the arrangement yarn defects are detected before taking over the roving and removed from the roving. A roving machine with one or more of the preceding features is preferably used here. With regard to the respective advantages, reference is made to the previous description.

In this connection, it is advantageous if, after the detection of a yarn defect, the roving is severed by means of a device for removing the yarn defect before and after the yarn defect, and the section containing the yarn defect is removed. In addition, it should be provided that the remaining yarn ends (i.e., the original yarn defects adjacent portions of the roving) are reconnected after removal of the yarn defect. The connection takes place, for example, by means of known splicing methods or with the aid of air flows, which can bring about a connection or a merging of the fibers of the respective yarn ends.

It is advantageous if the preparation of the roving is continued during the removal of the yarn defect, wherein the roving produced during the removal of the yarn defect is intermediately stored by means of a yarn store arranged between the outlet of the spinneret and the device for removing the yarn defect. In this case, the spinneret can continuously produce roving, while the roving produced is temporarily stored by the yarn store during the joining of the yarn ends resulting from the removal of a yarn defect, until yarn is taken over again by the transfer device (for example in the form of a winding device). It is also advantageous if the roving is withdrawn from the spinneret by means of a first conveying device and fed to the yarn store and withdrawn from the yarn store by means of a second conveying device and fed to the device for removing a yarn defect. The first conveyor ensures that the roving continuously produced by the spinneret is discharged, while the second conveyor can be stopped as needed to allow removal of a yarn defect. The second conveyor can also clamp the roving during the removal of the yarn defect, so that an unwanted movement is prevented.

It is also advantageous if the first conveyor continues during the removal of the yarn error with the deduction of the roving from the spinneret, while the promotion of the roving is interrupted by means of the second conveyor. The yarn store in this case takes up the roving produced by the spinneret and releases it again after the removal of the yarn defect or the subsequent joining of the yarn ends.

It is particularly advantageous if the takeover of the roving carried out with the aid of the transfer device is stopped during the removal of the yarn defect and resumed after the yarn defect has been removed. Tearing of the roving stopped in the area of the yarn-error removing device during the removal can be prevented in this case. After removal, the transfer device and, if present, also the second conveyor are put back into operation, wherein the commissioning preferably takes place synchronously.

It is also advantageous if a winding device is used as the transfer device, wherein the length of the roving temporarily stored with the aid of the yarn store can be determined by means of a control system within nier limits is increased by the winding speed of the winding device when an upper limit is exceeded and reduced when falling below a lower limit. As a result, an overflow of the yarn storage or tearing of the roving is avoided. If the already described second conveying device is present between the yarn store and the transfer device, its conveying speed should also be adapted to the winding device in order to avoid tearing or excessive sagging of the roving in this area as well. In principle, however, it is also possible to dispense with the second conveying device if the rotational speed of the spool is regulated in such a way that the fill level of the yarn store (regardless of any cleaning cut that may be carried out) is always kept within the stated limits. The roving machine according to the invention can therefore in this case only have the described first conveying device, since the withdrawal of the roving from the yarn store is realized with the aid of the winding device. The winding device preferably has a drive roller for the bobbin, the speed of which can be regulated as a function of the fill level of the yarn store. Alternatively, of course, a shaft carrying the coil can be directly driven, in which case the speed of the corresponding drive should be controlled accordingly.

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

FIG. 1 shows a schematic side view of a roving machine,

FIG. 2 shows a schematic side view of a roving machine according to the present invention,

FIG. 3 shows a schematic side view of a section of a roving machine according to the invention, Figure 4 is a schematic side view of a section of another roving frame according to the invention, and

Figure 5 is a schematic side view of another roving machine according to the invention.

FIG. 1 shows a schematic view of a section of a roving machine according to the invention. This preferably comprises a delivery device 20 (eg in the form of a pair of rollers) and a downstream drafting system 19. The drafting system 19 is in turn fed with a fiber structure 2 (for example a doubled conveyor belt strip) which has been removed from a can 21 with the aid of the delivery device 20. In addition, the roving shown has a the drafting system 19 in the transport direction of the fiber composite 2 downstream and an inlet opening 4 for the fiber structure 2 having spinneret 3. Within the spinneret 3 is arranged a non-visible vortex chamber in which the fiber structure 2 is provided with a protective rotation (the operation of the spinning station will be described in more detail below).

Subsequent to the spinneret 3, finally, a take-off roller pair 27 as well as a winding device 6 connected downstream of the take-off roller pair 27 can be arranged for the roving 1 leaving the spinneret 3 via an outlet 5. The winding device 6 can also (as in the cases of the remaining figures) comprise a spool 17 for the roving 1 and a spool 17 via direct contact with the bobbin or the roving 1 thereupon driven drive roller 18.

The roving machine according to the invention need not necessarily have a drafting system 19, as shown or indicated in the figures. Also, the take-off roller pair 27 is not mandatory.

The preparation of the roving 1 is now carried out according to a special Luftspinn- process, which was originally used to produce a finished yarn. In contrast to yarn production, it is now essential in the production of roving 1 that the fiber structure 2 introduced into the spinneret 3 is given only a protective rotation so that the resulting roving 1 remains further delayable for further processing in a subsequent spinning machine, for example a ring spinning machine , By contrast, conventional air-spinning devices impart to the fiber structure 2 such a strong rotation that the necessary distortion following the yarn production is no longer possible. This is also desirable in this case, since conventional air spinning machines are designed to produce a finished yarn, which should usually be characterized by a high strength.

By contrast, the fiber structure 2 within the spinneret 3 of the roving machine according to the invention receives only one protective rotation. Here, the fiber structure 2 is detected by an air flow, which is generated by the internal vortex chamber associated air nozzles. A part of the fibers is pulled out of the fiber structure 2 at least a little bit and wound around the tip of a spindle protruding into the vortex chamber. Characterized in that the fiber structure 2 is withdrawn through an inlet mouth of the spindle via a discharge channel disposed within the spindle from the vortex chamber, the free fiber ends are pulled in the direction of the inlet mouth and loop as Umwindefasern to the centrally extending and preferably untwisted core fibers. The result is a desired protection rotation having roving 1, which can be removed via the outlet 5 from the spinneret 3.

A disadvantage of such a Vorgarnherstellung the fact that the roving may have 1 defects. Defects here are basically sections of the roving 1, the diameter, strength, density, length weight or other physical properties for further processing Sizes are outside a predefined tolerance range. Finally, such defects must be removed in a separate step following the winding on the roving frame, so that the roving bobbin produced on the roving frame can not be transferred directly to a subsequent spinning, knitting or other textile machine processing a roving 1.

To solve this problem, it is now proposed to equip the roving with a to be passed from the roving 1 arrangement 7 for detecting and removing yarn defects 8 and to place them between the outlet 5 of the spinneret 3 and the withdrawn roving 1 accepting takeover device 28, so that Garnfehler 8 already detected before winding or direct transfer of roving 1 to a subsequent textile machine and can be removed from the roving 1.

The transfer device 28 can in this case be formed, for example, by the winding device 6 shown. Alternatively, however, it is also possible to transfer the roving 1 directly to a further textile machine, wherein the transfer device 28 can be formed in this case by a pair of rollers, which the transport of (the device 10 for removing the yarn error 8 leaving) roving 1 for ensures subsequent textile machine. In the following, the case will be described by way of example in which the roving 1 is wound onto a spool 17 with the aid of the aforementioned winding device 6.

As can be seen from the comparison with FIG. 1, the roving machine initially has a first conveying device 12 (eg a pair of rollers), with the aid of which the spinneret 3 is produced in the spinneret 3 Roving 1 is withdrawn from the spinneret 3. However, the roving 1 is not only pulled off and finally with the aid of a spooler direction 6 wound on a coil 17. Instead, the yarn is monitored for yarn defects 8 before being spooled, for example immediately after it leaves the spinneret 3, by means of a device 9 for detecting a yarn defect 8. Here, for example, optical or ultrasonic sensors are used, the z. B. Monitor the diameter of the roving 1 and transmit the measured values via a line 16 or wirelessly to a controller 14, which finally compares the values with corresponding setpoints or allowable tolerance ranges.

Subsequent to the first conveying device 12 follows a Garnspeicher to be explained 1 1, a second conveyor 1 3 (which in turn may be formed as a pair of rollers) and a device 10 for removing a Garnfehlers 8, which together with the device 9 for detecting a Yarn fault 8 forms the arrangement 7 according to the invention for the detection and removal of a yarn defect 8. Finally, the roving 1 is wound on a spool 17 by means of the winding device 6, wherein yarn defects 8, as explained below, are removed before winding, so that the bobbin 17 carrying the roving 1 can be fed directly to a textile machine processing the roving 1 ,

If a deviation of the monitored value is detected by the device 9 for detecting a yarn defect 8, the conveyance of the roving 1 in the direction of the transfer device 28 is continued until the yarn defect 8 is in the region of the device 10 for removing the yarn defect 8 (the time can be calculated from the conveying speed of the roving 1 and the distance to be covered). Subsequently, the transfer device 28 (in the example shown, the winding device 6) and the second conveyor 12 is stopped, so that the Garnfehler 8 having portion of the roving 1 is fixed within the device 10 for removing the Garnfehlers 8. The roving 1 is now severed within the apparatus 10 for the removal of the yarn defect 8 by a separating or cutting device before and after the yarn defect 8. The herausgetrennte section of the roving 1 can eventually disposed of, for example, be sucked.

Subsequent to the removal of the yarn defect 8, the portions of the roving 1 originally forming the yarn defect 8 and now forming two yarn ends are joined together. In this case, either the second conveying device 13 in the transport direction (= spinneret 3 -> transfer device 28) or the transfer device 28 can be driven counter to the transport direction to promote a little roving 1 in the device 10 for removing the Garnfehlers 8. This can ensure that, despite removal of the yarn defect 8, there is enough roving 1 for joining the yarn ends. The connection may eventually be by splicing, needling, scratching, calendering, by the use of air currents, or by other known joining methods.

In order not to have to stop the production of the roving 1 during the removal of a yarn defect 8, a yarn storage 1 1 is arranged between the first conveying device 12 (with the aid of which the yarn is withdrawn from the spinneret 3) and the second conveying device 13. This can be formed, for example, as feeder 23 or pneumatic yarn storage 1 1. In the former case (FIG. 3), a drivable bobbin is provided, the peripheral speed of which during the roving production approximately corresponds to the delivery speed of the spinneret 3. The withdrawn roving 1 winds around the bobbin several times and is finally withdrawn via one of the end faces and with the interposition of a guide 22 again. As long as the takeover speed of the transfer device 28 corresponds to the withdrawal speed of the first conveyor 12, the length of the roving 1 wound on the bobbin remains constant. If now the second conveying speed is stopped for the purpose of removing a yarn defect 8, the yarn store 1 1 fills, ie the roving 1 drawn from the spinneret 3 is wound onto the bobbin by its rotation, without roving 1 being pulled off at its front side.

If the removal of the yarn defect 8 is completed, the second conveying device 13 and the transfer device 28 are put back into operation. The conveying speeds of said units can be increased compared to the take-off speed of the first conveyor 12, so that the yarn store 1 1 again empties to a defined minimum value. From this point on, finally, the first and second conveying devices 12, 13 driven by drive 15 and the transfer device 28 (ie, drive roller 18 of reel 17 in the example shown) are again driven at "normal speed." In other words, the amount of roving 1, which the spinneret 3 leaves, taken over by the transfer device 28. The level of the yarn store 1 1 remains constant until the removal of the next yarn defect 8.

As an alternative to the feeder 23 shown in FIG. 3, a pneumatic yarn store 11 with a depression 29 can also be used (FIG. 4). This has, for example, a standing with a vacuum line 26 in communication vacuum chamber 24, in which the roving 1 can be sucked in the form of a loop. As a storage surface for the roving 1 may be present within the vacuum chamber 24, a screen 25 so that roving 1 can be cached with a length exceeding the length of the vacuum chamber 24. The pressure in the vacuum chamber 24 is finally adjustable analogously to the rotational speed of the bobbin of the above-described Suppliers 23. In other words, the negative pressure is increased and thus the Garnspeicher 1 1 filled when the removal of a yarn defect 8 is present and reduced again when the Ent- Distance of the yarn error 8 is done so that the yarn storage 1 1 can empty again to a minimum level.

Finally, FIG. 5, in a modification of FIG. 2, shows a further roving machine according to the invention. As can be seen from FIG. 5, the second conveying device 13 has been dispensed with. Rather, the deduction from the yarn storage 1 1 is realized only by the drive of the winding device 6, which in turn can be done with the aid of the drive roller 18 shown. For example, it would be possible to vary the speed of the coil 17 and thus the winding speed of the roving 1 by changing the drive speed (or the speed of the drive roller 18).

The variation could z. Example, in such a way that the rotational speed is initially selected so high that the withdrawal speed of the roving 1 (ie, the length of the rinsed per unit time roving 1) is higher than the delivery speed (ie, the length of the roving 1 produced per unit time) of the spinneret. 3 The yarn storage 1 1 would be gradually emptied at this stage.

If the fill level of the yarn store 1 1 (monitored, for example, by means of a sensor) reaches a predetermined minimum value, then the speed of the spool 17 would be reduced to such an extent that the take-off speed is below the delivery speed of the spinneret 3. As a result, it would come back to a filling of the yarn memory 1 1. If the level exceeds a maximum value, the speed of the spool 17 would be increased again to its initial value, so that it would come again to a draining of the yarn memory 1 1. By appropriate control of the speed of the coil 17 (or the drive unit) thus the level (even during a cleaner cut, in which the coil 17 would be stopped) could always be kept between the above limits.

Incidentally, the invention is not limited to the illustrated embodiments limited. 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.

LIST OF REFERENCES

1 roving

2 fiber bandage

3 spinneret

4 inlet opening

5 outlet

6 winding device

7 Arrangement for detecting and removing a yarn defect

8 yarn error

9 Device for detecting a yarn defect

10 Apparatus for removing a yarn defect

1 1 yarn storage

12 first conveyor

13 second conveyor

14 control

15 drive

16 line

17 coil

18 drive roller

19 drafting system

20 delivery device

21 jug

22 leadership

23 Supplier

24 vacuum chamber

25 sieve

26 vacuum line

27 take-off roller pair

28 acquisition device

29 deepening

Claims

Patent claims

1 . Roving machine for producing a roving (1) from a fiber structure (2),

- wherein the roving machine has at least one spinneret (3) with an inlet opening (4) for the fiber structure (2),

- wherein the spinneret (3) is associated with at least one air nozzle, via the air in the spinneret (3) is conductive to the fiber assembly (2) within the spinneret (3) to give a protective rotation,

- wherein the spinneret (3) has an outlet (5) over which the roving (1) from the spinneret (3) is removable, and

- wherein the roving frame at least one of the spinneret (3) downstream in the transport direction of the roving (1) takeover device (28), in particular in the form of a winding device (6), for taking over the spinneret (3) leaving roving (1),

characterized in that

the roving machine comprises an arrangement (7) for the detection and removal of yarn defects (8) to be passed through the roving (1), the arrangement (7) being placed between the outlet (5) of the spinneret (3) and the transfer device (28) ,

2. roving according to the preceding claim, characterized in that the arrangement (7) in addition to a device (9) for detection and a device (10) for removing the Garnfehlers (8) a Garnspeicher (1 1) for temporarily storing the spinneret (3 ) during the removal of the yarn defect (8) leaving roving (1), wherein the yarn storage (1 1) between the outlet (5) of the spinneret (3) and the device (10) for removing the yarn defect (8) is placed.

Roving machine according to the preceding claim, characterized in that the yarn store (1 1) is placed between the device (9) for detecting a yarn defect (8) and the device (10) for removing the yarn defect (8).

Roving machine according to one or more of claims 2 and 3, characterized in that between the outlet (5) of the spinneret (3) and the yarn store (1 1) a first conveyor (12) for the roving (1) and between the Garnspeicher ( 1 1) and the apparatus (10) for removing the yarn defect (8) a second conveyor (13) for the roving (1) is arranged, wherein the conveying speed of the second conveyor (13) regardless of the conveying speed of the first conveyor (12) is controllable.

Roving machine according to the preceding claim, characterized in that the yarn store (11) is placed between the first conveying device (12) and the second conveying device (13).

Roving machine according to one or more of claims 2 to

5, characterized in that a pneumatic yarn store (1 1) is used, which is adapted to suck the roving (1) produced during the removal of the yarn defect (8) in a recess (29).

Roving machine according to one or more of claims 4 to

6, characterized in that the roving machine comprises a controller (14) which is designed to continue to operate the first conveying device (12) during the removal of the yarn defect (8) and to convey the roving (1) by means of the second conveying device. (13).

8. roving machine according to one or more of the preceding claims, characterized in that the roving machine comprises a controller (14) which is formed, with the aid of the transfer device (28) carried out takeover of the roving

(1) to interrupt during the removal of the yarn defect (8) and to continue after the removal of the yarn defect (8).

9. A process for producing a roving (1) from a fiber structure

(2) by means of a roving machine,

- wherein the fiber structure (2) is introduced via an inlet opening (4) into a spinneret (3),

- wherein the fiber structure (2) within the spinneret (3) by means of a flow of air is given a protective rotation,

- Wherein the roving (1) via an outlet (5) from the spinneret (3) is withdrawn, and

wherein the roving (1) leaving the spinneret (3) is taken over by means of a take-over device (28), for example a winding device (6), downstream of the spinneret (3) in the transport direction of the roving (1),

characterized in that

the roving (1), after leaving the spinneret (3), passes through an arrangement (7) placed between the outlet (5) of the spinneret (3) and the transfer device (28) for detecting and removing yarn defects (8), using the Arrangement (7) yarn defects (8) are detected before the takeover of the roving (1) and removed from the roving (1).

10. The method according to the preceding claim, characterized in that the roving (1) after the detection of a yarn defect (8) by means of a device (10) for removing the yarn defect (8) is severed before and after the yarn defect (8) and the section containing the yarn defect (8) is removed, and that the remaining yarn ends of the roving (1) after the removal of the yarn defect (8) are reconnected.

1 1. Method according to one or more of claims 9 and 10, characterized in that the production of the roving (1) is continued during the removal of the yarn defect (8), and the roving (1) produced during the removal of the yarn defect (8) by means of one between the outlet (5) of the spinneret (3) and the device (10) for removing the yarn defect (8) arranged yarn store (1 1) is temporarily stored.

12. The method according to the preceding claim, characterized in that the roving (1) with the aid of a first conveying device (12) withdrawn from the spinneret (3) and the Garnspeicher (1 1) supplied and with the aid of a second conveyor device (13) from the Yarn storage (1 1) deducted and the device (10) for removing a yarn defect (8) is supplied.

13. The method according to the preceding claim, characterized in that the first conveyor (12) during the removal of the Garnfehlers (8) with the deduction of the roving (1) from the spinneret (3) continues, while the promotion of the roving (1) with Help the second conveyor (13) is interrupted.

14. The method according to one or more of claims 9 to 13,

characterized in that the takeover of the roving (1) carried out with the aid of the transfer device (28) is stopped during removal of the yarn defect (8) and resumed after removal of the yarn defect (8).

15. The method according to one or more of claims 1 1 to 14, characterized in that as takeover device (28) is a winding device (6) is used, wherein the length of the yarn store (1 1) cached roving (1) with Help a controller (14) is kept within defined limits by the winding speed of the winding device (6) increases when an upper limit is exceeded and is reduced when falling below a lower limit.