CN115485424A

CN115485424A - Apparatus and method for producing combed slivers

Info

Publication number: CN115485424A
Application number: CN202180027293.0A
Authority: CN
Inventors: 妮可·泽格; 罗兰·弗里德里希
Original assignee: Trutschler Group Europe
Current assignee: Trutschler Group Europe
Priority date: 2020-04-09
Filing date: 2021-02-26
Publication date: 2022-12-16
Anticipated expiration: 2041-02-26
Also published as: WO2021204462A1; EP4133124A1; DE102020109963A1; CN115485424B

Abstract

The invention relates to a method and a device for producing combed slivers (F), comprising a winding machine (W) and at least one combing machine, wherein the winding machine (W) produces a set of a plurality of laps (1) made of slivers (4) for each combing machine, the laps are transported to the combing machine and delivered to a combing head (20), wherein combed slivers are produced from each lap (1), wherein one or more slivers are subsequently drafted into a single sliver (F). The invention is characterized in that the deviation of the sliver mass of the fiber sliver (F) is measured, compared to the nominal sliver weight and correlated to the unwinding length of the lap (1), wherein the drafting and/or the tensioning on the winder (W) is adjusted for the next group of laps (1) over the winding length by means of the data.

Description

Apparatus and method for producing combed slivers

Technical Field

The invention relates to a device and a method for producing combed fibre slivers according to the preamble of claims 1 and 9.

Background

From the prior art, it is known in the textile technology field to feed carded and drafted fiber slivers to a winder, which produces cotton rolls therefrom. One or more laps are a reserve for producing combed slivers in a combing machine. Usually 5 to 6 combing machines are associated with a winder which produces a lap from 20 to 36 slivers. At least 8 laps are again passed to the combing machine for combing, from which drafted slivers of as equal quality as possible are produced. In the case of a winding machine, the head end of the sliver, which is directly adjacent to the winding bobbin, cannot be drawn to the desired quality, since it must first be threaded into a different roller pair and therefore cannot be drawn. In this case, the grammage of the cotton of the first few meters abutting on the winding bobbin is too high. Likewise, the end of the sliver which lies on the outside against the lap and which first enters the combing machine cannot be drawn down to the desired quality on the combing machine, since it likewise needs to be first inserted into the combing machine. Here too, the grammage of the cotton of the first few meters is too high. The lap therefore has a sliver weight deviating from the nominal value at least at its head and tail ends, which must be set by, for example, drawing or drawing regulation of eight or more combed slivers in a combing machine. For this purpose, the combing machine has a plurality of individually driven drawing frame rollers per drawing frame in the main drawing, which results in high investment costs. In combing machines without separately driven drafting unit rollers, quality fluctuations can remain in the sliver because no adjustment is possible.

Disclosure of Invention

Accordingly, the object of the present invention is to improve a device and a method for producing combed slivers as follows: the slivers produced in the combing machine have a constant fiber quality at a low expenditure.

The invention solves the task by means of a device having the features given in claim 1 and a method according to claim 9. Advantageous embodiments of the invention are defined in the dependent claims.

The invention relates to a device for producing combed slivers, comprising a winding machine and at least one combing machine, wherein the winding machine is designed to produce a plurality of laps made of sliver for each combing machine. By means of the transport system, the lap can be transported to at least one combing machine and given to the combing head. The at least one combing machine is designed to produce a combed sliver from each lap, which is subsequently drawn together with the other slivers of the combing machine into a single sliver.

The present invention comprises the following technical teaching: the at least one combing machine has a measuring device which is designed to measure deviations in sliver quality of a sliver. The control device of the combing machine is designed to compare the sliver mass of the fiber sliver with the rated sliver weight and to correlate the unwinding length of the lap. With the aid of these data, the drafting and/or the tensioning of the sliver on the winding machine can be adjusted over the winding length for the next group of laps for the combing machine. Alternatively or additionally, the drafting and/or the tensioning of the sliver at the combing head of the combing machine can be adjusted.

The draft and/or the tension can preferably be adjusted in the combing machine between the winding roller, against which the lap rests, and the feed cylinder. Alternatively, the draft and/or tension can be adjusted between the rollers and compression rollers used in the automated reel-up laying process and the feed rollers.

The advantage of the method is that all combing machines can be equipped with simpler and cheaper drafting devices, wherein only one pair of drafting devices in the main draft needs to be equipped with a drive and a constant sliver quality can still be produced. The previous second drive in the main drafting can be dispensed with in the drafting device, since the optimization of the sliver mass is carried out primarily in the winding machine. This saves costs, since the drive motor is omitted on each combing machine, energy is also saved on the combing machine and a more compact construction of the drafting unit is obtained. Finally, the combed sliver is optimized by a manual or automatic data exchange between at least one combing machine and the winding machine. The operating data of the winding machine are adapted to the deviation of the sliver on the combing machine from the nominal sliver weight over the winding length.

In an advantageous development of the invention, the drafting and/or tensioning on the winder can be achieved by actuating at least one drafting mechanism and/or changing the relative speed between two winding elements. In this case, the drafting can advantageously be varied by means of at least one drafting device and/or pressure rollers on the winder. The optimization of the sliver mass of a sliver on a combing machine can be started by means of a drafting device or a press roll in such a way that the drafting and the merging of the slivers or drafted slivers fed into the winder are optimized.

Once the cotton is formed from the delivery of the drafting strips, the tensioning of the cotton can preferably be influenced by winding rollers, which can form possible types of winding elements.

The data for changing the drafting and/or the tension on the winding machine can preferably be transmitted from the at least one combing machine to the winding machine manually or by means of a control device of the device. The control of the combing machine can for example show on the display, within which length range of the sliver the mass of the sliver needs to be adjusted. This can be entered into the control device of the winding machine by the user manually or with a data stick or using a tablet computer or smartphone. Alternatively, the control device of the device can automatically perform the data exchange and control the winding machine for the next group of laps in terms of drafting and tension over the winding length by means of the measured data which are evaluated in the control device of the combing machine.

The lap groups can be transported manually, semi-automatically or automatically to the associated combing machine by means of a transport system. In the case of manual transport, the winding machine indicates to the user on the operating display which combing machine the lap group is to be transported to. In the case of semi-automatic transport, the user may simply put the lap from the transport trolley into the combing machine, since the transport trolley is loaded with the lap group from the winding machine and is driven by means of the transport system to the associated combing machine. In the case of automatic transport, the lap is automatically removed after the winding machine, automatically transported and automatically introduced into the associated combing machine.

The measuring device is preferably arranged on or in a sliver bell of the at least one combing machine, wherein the sliver bell is arranged downstream of the drafting device. The measuring bell is configured to detect a sliver weight of the sliver at the sliver bell. In this case, the control device of the combing machine determines a deviation from the nominal sliver weight of the combed sliver F, which is correlated with the unwinding length of the lap. The unwinding length of the lap is determined by inverse calculation of the fiber mass at the sliver funnel and the draft at the combing machine, so that deviations in the fiber mass can be correlated accordingly to the lap length with an accuracy of, for example, a few centimeters. The inverse calculation is carried out in the control device of each combing machine, which either displays the data for the user or transmits the data to a higher-level control device of the device. The determined data are used to adjust the drafting on the winding machine so that the end of the sliver which is first provided to each combing head is drafted in such a way that a constant sliver weight is present.

The method according to the invention for producing combed slivers comprises a winding machine and at least one combing machine, wherein the winding machine produces a plurality of laps made of sliver for each combing machine. The lap group is transported to the associated combing machine and each combing head is delivered with its own lap. From each lap, combed slivers are produced (4 to 16 slivers per combing machine) which are finally drawn into a single sliver. The present invention is based on the following recognition: the deviation of the sliver weight from the nominal value can be compensated by adjusting the winder, at least for the next group of laps. The invention is characterized in that the deviation of the sliver mass of a fiber strip is measured, compared to a target value and correlated to the unwinding length of the lap. With the aid of these data, the drafting and/or the tensioning on the winder can be adjusted over the winding length for the next group of laps (1).

With the method according to the invention, the process can be optimized by the interaction of the two machines of the production line, whereby the subsequent combing machine can be produced more inexpensively, since the drive in the main drafting of the drafting unit can be dispensed with here. The combing machine therefore consumes less power, is cheaper and can be constructed more compactly. At the same time, a constant sliver weight at the combing machine can be achieved.

The drafting and/or tensioning of the head end and/or the tail end can preferably be adapted to the unwinding length of each lap of a group of laps. The combing process can thus be optimized for a lap group producing a constant or different lap grammage over the winding length.

Ideally, a constant cotton grammage can be produced over the entire winding length by means of the previously mentioned measures. Alternatively, with the device and the method, the cotton grammage over the winding length can be varied, for example, in order to compensate for process variations on the combing machine. For example, depending on the diameter of the lap, different winding stresses (tensions) are advantageous. The adjusted cotton grammage may be beneficial for optimized combing results. When a new lap is given to the combing machine after the lap change, no stress is applied to the lap when the sliver is introduced. Lack of normal drafting and thus higher quality fibres. In this case, it may be practical to reduce the grammage of the cotton on the winder W by, for example, 3% to 6% over a corresponding length range of the sliver.

Drawings

The following description of preferred embodiments of the invention together with further measures for improving the invention are explained in more detail with the aid of the drawings.

In the figure:

fig. 1 shows a device for producing combed slivers;

FIG. 2 shows a schematic view of a winder;

FIG. 3 shows a schematic side view of a combing head of a combing machine;

fig. 4 shows a schematic top view of the combing machine.

Detailed Description

Fig. 1 shows a device for producing combed slivers, having at least one winder W, an automatic or manual transport system T, and a plurality of combing machines K1 to K6. The winding machine W is supplied with fiber slivers or drafting slivers 9 from a plurality of cans 10, from which the lap 1 is produced for delivery to the combing machine K. The transport of the lap 1 from the winder W to the combers K1-K6 can be effected manually, semi-automatically or automatically by means of the transport system T. Manual transport of the lap W can be carried out by means of a manually movable storage trolley which can accommodate at least 8 or more laps to be handed to a single combing machine. The semi-automatic transport can be carried out by an automatically movable storage trolley which, after the first loading of the rolls, automatically moves them to the respective combing machine and there transfers them into the receiving device. The automatic transport can be carried out by a ceiling conveyor system, the respective number of laps 1 being taken from a buffer downstream of the winding machine W and automatically transported to the conveyor of the combing machine and stored there. The control device S is designed to compare the operating data of the winding machine W with the operating data of the combing machines K1 to K8 and to carry out a corresponding control.

According to fig. 2, the lap 1 is placed on two winding rollers 2 and 3 (winding nip) of the winder W, which can rotate in the direction of the arrow. The sliver 4 (indicated by a dashed line) passes through a nip (pressing nip) comprising at least three press rolls 5,6 and 7 before travelling towards the lap 1 and being wound on the lap 1. The sliver 4 is formed from one or more conveyed webs or adjacent drafting strips 9 in a drafting mechanism 8 of the winder W. Further drawing frames or several drawing frames can be connected upstream of the drawing frame 8. A table-type press section consisting of two rollers 11,12 is arranged between the delivery roller of the drafting mechanism 8 and the press roller 5 of the press section. Upstream of the feed rollers of the drafting arrangement 8, deflecting rollers 13 are arranged, which deflect the fiber or drafting strands 9 from the upstream can (not shown) and creel (not shown). The working direction of the lap winder is indicated with a. Arrows B and C indicate the direction of travel of the drafted sliver 9 or sliver 4. The direction of rotation of the

rolls

2,3, 5,6,7, 11 and 12 and of the lap 1 is indicated by curved arrows.

The drawing frame 8 can be designed as a 3-over-3-under drawing frame, i.e. it consists of three lower rollers and three upper rollers. Alternative draft designs, such as 4-up, 3-down draft designs, are also possible. A composite fiber strand consisting of a plurality of fiber strands or drafting strands 9 is drafted in a drafting device 8. The drafted sliver 9 is drawn in the direction B into a sliver 4 by means of the pressure rollers 11,12 and deflected in the direction C.

The winding rollers 2,3 each have a separate drive, at least one of which is controllable or adjustable, so that the winding rollers 2,3 can be operated at the same or different rotational speeds. In order to avoid the formation of air bubbles in the produced lap 1 and to stabilize the drafting of the sliver 4, the winding rollers 2,3 are driven with a tension of 0 to 5%. This means that one winding roller 2,3 (preferably winding roller 3) is operated at a rotational speed which is not more than 5% lower than winding roller 2. By means of the drives of the winding rollers 2,3, which are to be controlled or regulated individually, the separation process can be corrected when winding up the lap 1 in such a way that the sliver 4 between the pressure roller 7 and the winding roller 2 is separated by a later stop of the winding rollers 2 and 3 and a simultaneous stop of the pressure rollers 5,6,7, but one end remains between the winding roller 2 and the pressure roller 7, whereby the lap winder (after the new bobbin 1a is placed) can automatically continue to run. Thereby, manual insertion of the tampon 4 is no longer required. The drafting bars 9 need only be inserted manually when changing the can. The pressure rollers 5,6,7 are also preferably provided with a separate, controllable or adjustable drive, so that the draft between the pressure rollers 5,6,7, and also between the pressure roller 7 and the winding roller 2, can be adjusted during the formation of the bubbles. The process for producing the lap 1 can therefore be further optimized and stabilized, and can therefore be run at higher production speeds.

Combing heads 20 are shown in fig. 3, in which at least eight combing heads are mounted on one combing machine. For the sake of clarity, this embodiment is shown and described with only one combing head 20, wherein the details shown here are mounted on each of these combing heads, except for the common drive unit and the coiler. Combing head 20 comprises two winding

rollers

21,22, wherein the front winding roller 21 is connected to a drive 23 driven by a motor 24. The lap 1 is placed on winding

rollers

21,22, from which the sliver 4 is unwound by a rotational movement. The sliver 4 can be diverted at the roller 25 and transferred to the feed cylinder 26 of the nipper mechanism 27. Here, a pressure roller 30, which can be pivoted about a lever 28 by the action of a spring 29, is arranged on the roller 25, which is likewise driven by the drive 23. This embodiment with the roller, spring-loaded lever 28 and pressure roller is preferably used only during automatic lap spreading and need not be an integral part of each combing machine. The nipper mechanism 27 can be driven by a shaft 31 connected to the actuator 23 in a manner of reciprocating by a lever. According to the example shown, the nipper mechanism 27 is in a forward position and delivers the combed fibre fleece to a subsequent pair of detaching rollers 32. Below the nipper mechanism 27, a circular comb 33 is rotatably mounted, which combs out the fiber fleece provided by the closed nipper by means of its needle plate carrier. The circular comb 33 is likewise in driving connection with the actuator 23. The sliver 4 is wound around the winding bobbin 1 a. A ratchet, not shown, is fastened to the feed cylinder 26, which ratchet is rotated in steps by a pawl, also not shown, as a result of the reciprocating movement of the nipper mechanism 27 and thereby feeds the sliver 4 to the jaws of the nipper for combing out. In operation, the sliver 4 is continuously unwound due to the rotational movement of the lap 1 by the winding

rollers

21,22 and is brought into the region between the clamping position and the feed cylinder 26 via the clamping position of the pressure roller 30 and the roller 25. For carding, the cotton is then conveyed by the feed cylinder 26 to the nip of the nipper mechanism 27 and then to the detaching roller 32. The web thus produced is combined by the paired draw-off

rollers

34,35,36 and the sliver guide 37 to form a sliver and is fed to the drawing unit 40 (see fig. 4) with the sliver likewise formed at the other combing heads. The web formed by the drawing frame is combined into slivers, so-called combed slivers, and transferred to a can coiler for winding in cans.

The combed slivers of the individual heads then pass through the pairs of draw-off rollers 35 to 37 and are passed by these pairs of draw-off rollers in the form of slivers or webs onto a sliver guide 37 which is jointly associated with all the combing heads of the machine. The short fibers, lumps and impurities removed from the fibrous material by the circular comb 33 and the top comb 38 are sucked as so-called combed noils through a guide channel into a suction channel which is commonly associated with all the combing heads of the machine. The slivers of the individual heads of the different combing heads of the machine run on the cotton guide 37, usually side by side, to a common drafting device 40. At the outlet of the drawing frame, a sliver funnel 41 is arranged, which forms the web into a combed sliver, and the combed sliver lap is then placed in the can 10.

According to fig. 4, eight combing heads 20 are arranged in the combing machine K shown here, which are each fed by a lap 1 having a width of, for example, 300mm and a fiber mass of 80 ktex. Each roll 1 has a sliver 4 of a length of about 300 m. Combing heads 20 each produce a combed fiber flock (Faserflor) from combed slivers 4, which are combined to form combed slivers F1 to F8 by means of sliver guide horns 41. Each fiber strand F1 to F8 may have a fiber mass of, for example, 11.25 ktex. The sliver bell 41 is designed as a measuring bell, by means of which the sliver mass of each combing head K1 to K8 is determined. The fiber strands F1 to F8 arrive at the discharge table 39 and travel via the drafting device 40 with a total strand weight of 90ktex to a further sliver funnel 42, which combines all fiber strands F1 to F8 into a single fiber strand, which is wound into a can 10. The drafting mechanism 40 drafts the eight fiber strands F1 to F8 by 18 times to form individual fiber strands having a sliver weight of, for example, 5ktex, and then winds the fiber strands in the can 10 at a winding speed of, for example, 230 m/min. The sliver bell 42 is designed as a measuring bell, by means of which the sliver mass of the combing machine is determined. The electrical signal of each

individual conductor bell

41, 42 is transmitted to the control device S via electrical leads.

With reference to fig. 1 to 4, according to the invention, the sliver weight of the fiber sliver F is detected at the sliver funnel 42. Deviations from the nominal sliver weight of the combed sliver F are detected and correlated with the unwinding length of the lap 1. The unwinding length of the lap 1 is determined by inverse calculation of the fiber mass at the sliver funnel 42 and the draft at the combing machine K, so that deviations in the fiber mass can be correlated accordingly to the winding length with an accuracy of, for example, a few centimeters. The inverse calculation is carried out in the control device of each combing machine, which either displays the data for the user or transmits the data to the superordinate control device S of the device. The determined data are used to set the drafting on the winding machine W so that the end of the sliver 4 which is first provided to each combing head 20 is drafted in such a way that a constant sliver weight is present. The adjustment of the draft of the end of the sliver 4 by the winder W can be carried out at the drafting mechanism 8 and/or at the pressure rollers 5,6, 7. Alternatively or additionally, the winding tension of the head end of the sliver 4 at the winding rollers 2,3 can be adjusted by increasing the winding tension of the head end region of the sliver 4 by 0.5% to 5%. As the winding is tensioned, the winding roller 3 runs at a speed 0.5% to 5% higher than the winding roller 2, thereby reducing the fiber mass of the leading end of the sliver 4.

The tensioning draft can be set and varied on the combing machine K by means of the winding

rollers

21,22 and the feed roller 26. In the combing machine K with automatic winding and spreading, the tensioning draft can also be adjusted and varied between the roller 25 with the pressure roller 30 and the feed roller 26. Here, no adjustment of the joining process is required. The process is not influenced by the noil outlet of the combing machine, since all the basic settings required for this (top comb, circular comb, combing, etc.) on the combing machine are not changed.

Since each combing machine K1-K6 is equipped with a group of at least eight laps 1 each, the data for determining the deviation from the nominal sliver weight of each combing machine K1-K6 must also be assigned to eight laps 1 each. The winding machine W therefore always produces, for example, a group of eight laps 1, which are distributed to the respective combing machine, for example to the combing machine K1, by means of a manual, semiautomatic or automatic transport system. This can be done by manual adjustment of the control of the winding machine W in such a way that the user stores the drafting in relation to the length of the lap 1 to be produced and takes into account the weight of the sliver produced in the combing machine to be equipped. Alternatively, the control device S can use the data from the deviation from the nominal sliver weight of the combing machine K1, for example, for drafting and/or tensioning of the group of eight laps 1 to be produced for the winding machine W, which are transported from the transport system T to the combing machine K1. After a group of optimized rolls 1 has been delivered to the combing machine, the sliver weight after the drafting device 40 is again detected at the sliver funnel 42 and the deviation from the nominal sliver weight is determined from the unwinding length of the roll 1. Using these data, the next group of, for example, eight lap rolls 1 on the winder W can be further optimized if necessary.

If the combing machine K1 is already equipped, the data of the combing machine K4 are used, for example, to produce the next eight laps 1, since the combing machine then requires a new lap reserve. This process is carried out in the same way as described in the combing machine K1.

Eight reels 1 can be transported manually by the user to the respective combing machines K1 to K6 by means of the transport system T, for example by means of transport carts, wherein the winding machine W can display the group of designated reels 1 for which combing machine K1 to K6 on a display screen for the user.

In the semiautomatic transport system T, the transport trolley is assigned by the control device S to which combing machines K1 to K6 the group of laps 1 is to be transported. The user places groups of, for example, eight laps 1 into the combing machines K1-K6 by hand only.

In the automatic transport system T, for example, groups of eight lap rolls 1 are removed from storage after the winding machine W and transported, for example, by a ceiling conveyor system to the associated combing machines K1 to K6.

The control device S therefore always controls the production of groups of, for example, eight laps 1 using data relating to the deviation of the associated combing machine K from the nominal sliver weight and in this case coordinates the transport of groups of laps 1 with the respective combing machine K.

The advantage of the method is that all combing machines can be equipped with simpler and cheaper drafting devices 40, wherein only one pair of drafting devices in the main draft needs to be equipped with a drive. The previous second drive in the main drafting can be dispensed with in the drafting device 40, since the optimization of the sliver mass is carried out primarily in the winding machine. This saves costs, since the drive motor is omitted on each combing machine, energy is also saved on the combing machine and a more compact construction of the drafting unit is obtained. Finally, the combed sliver is optimized by a manual or automatic data exchange between at least one of the combing machines K1-K6 and the winding machine W. The operating data of the winding machine W are adapted to the deviation of the sliver F from the nominal sliver weight on the combing machines K1 to K6 over the winding length.

Depending on the configuration of the combing machine, the latter can now accommodate a set of 4 to 16 laps 1, which are produced with the same parameters in terms of drafting or tensioning in the winder W. Depending on the construction of the winder W, it may be constructed with two pressure rollers 2,3, one or more winding rollers and one winding band or only a winding band. All the configurations of the winding machine W have in common that the produced sliver 4 is drawn, for example by means of a drawing frame, and/or influenced in terms of speed/rotational speed (tension) by a relative movement between the two winding elements.

According to the invention, a constant cotton grammage can ideally be produced over the entire winding length. Alternatively, with the device and the method, the cotton grammage over the winding length may be varied, for example to compensate for process variations on the combing machine. For example, depending on the diameter of the lap, different winding stresses (tensions) are advantageous. The adjusted cotton grammage may be beneficial for optimized combing results. When a new lap is given to the combing machine after the lap change, no stress is applied to the lap 1 when the sliver 4 is introduced. The usual draft is absent, whereby higher quality fibres are combed. In this case, it may be practical to reduce the grammage of the cotton on the winder W by, for example, 3% to 6% over a corresponding length range of the sliver.

List of reference numerals

1. Cotton roll

1a winding bobbin

2,3 winding roller

4. Cotton sliver

5,6,7 nip roll

8. Drafting mechanism

9. Drafting strip

10. Sliver can

5363 roll for desk type press part of 11,12

13. Steering roller

20. Combing head

21,22 winding roller

23. Transmission device

24. Motor with a stator having a stator core

25. Roller

26. Feeding cylinder

27. Nipper mechanism

28. Lever

29. Spring

30. Press roll

31. Shaft

32. Detaching roller

33. Round comb

34,35,36 sliver delivery roller

37. Cotton guide plate

38. Top comb

39. Discharging table

40. Drafting mechanism

41. Conducting bar horn mouth

42. Conducting bar horn mouth

Running directions of cotton slivers A, B and C

F, F1-F8 fiber strip

K, K1-K6 combing machine

S control device

T-shaped transportation system

A W winder.

Claims

1. Device for producing combed slivers (F) comprising a winding machine (W) and at least one combing machine, wherein the winding machine (W) is designed to produce a set of a plurality of laps (1) made of slivers (4) for each combing machine, the device further comprising a transport system (T) which is designed to transport the laps (1) to the at least one combing machine and to a combing head (20), wherein the at least one combing machine is designed to produce combed slivers from each lap (1), wherein one or more slivers are subsequently drafted to a single sliver (F), characterized in that the at least one combing machine has a measuring device which is designed to measure deviations in the sliver mass of the sliver (F), wherein a control device of the combing machine is designed to compare the sliver mass of the sliver (F) with a nominal sliver weight and to correlate the unwinding length of the lap (1), wherein the sliver (4) tension or the sliver tension of the winding machine (W) and/or the combing head (20) can be adjusted for a next set of combing machines.

2. The device according to claim 1, characterized in that the drafting or tensioning of the sliver (4) in the combing head (20) takes place between the winding rollers (21, 22) and the feed roller (26) or between the pressure roller (30) and the feed roller (26).

3. Device according to claim 1, characterized in that the drafting and/or tensioning on the winder (W) is achieved by means of operating at least one drafting mechanism and/or varying the relative speed between two winding elements.

4. The apparatus according to claim 3, characterized in that the drafting can be varied by means of at least one drafting mechanism (8) and/or by means of pressure rollers (5, 6, 7).

5. The apparatus according to claim 3, characterized in that the winding element is configured as a winding roller (2, 3).

6. Device according to claim 1, characterized in that data for changing the drafting and/or tensioning on the winder are transmitted to the device manually or by means of a control device (S).

7. The device according to claim 1, characterized in that the groups of laps (1) are transported manually, semi-automatically or automatically to the associated combing machines (K1-K6) by means of a transport system (T).

8. Device according to claim 1, characterized in that the measuring device is arranged on or in a sliver bell (42) of the combing machine (K1-K6), wherein the sliver bell (42) is arranged downstream of the drafting mechanism (40).

9. Method for producing combed slivers (F) comprising a winding machine (W) and at least one combing machine, wherein the winding machine (W) produces a set of several laps (1) made of slivers (4) for each combing machine, the laps (1) are transported to the combing machine and given to the combing head (20), wherein combed slivers are produced from each lap (1), wherein one or more slivers are subsequently drafted into a single sliver (F), characterized in that a deviation of the sliver mass of the sliver (F) is measured, the sliver weight is compared with a nominal sliver weight and is correlated with the unwinding length of the lap (1), wherein the drafting and/or tensioning of the sliver (4) on the winding machine (W) can be adjusted for the next set of laps (1) over the winding length and/or the drafting or tensioning of the sliver (4) in the combing head (20) of the combing machine can be adjusted by means of these data.

10. Method according to claim 9, characterized in that the drafting and/or tensioning of the head end and/or tail end is adapted to the unwinding length of each lap (1) in a group.

11. Method according to claim 9 or 10, characterized in that the groups of laps (1) have a constant or different cotton grammage over the winding length.

12. Method according to one of claims 9 to 11, characterized in that the drafting and/or tensioning on the winder (W) is effected by operating at least one drafting mechanism and/or changing the relative speed between two winding elements.

13. Method according to claim 9, characterized in that data for changing the drafting and/or tensioning on the winder are transmitted to the device manually or by means of a control device (S).

14. The device according to claim 9, characterized in that the groups of laps (1) are transported manually, semi-automatically or automatically by means of a transport system (T) to the associated combing machine (K).