DEVICE AND METHOD FOR PRODUCE A COMBLED FIBER TAPE

Description

[0001] The present invention relates to a plant and a method for producing a combed fiber sliver according to the preamble of claims 1 and 7.

[0002] According to the state of the art in textile technology, it is known to feed carded and drawn fiber slivers to a winding machine, which produces a lap roll from them. The lap roll(s) are the template for producing a combed fiber sliver in a combing machine. Typically, 5 to 6 combers are assigned to a winding machine, which produce a lap roll from 20 to 36 fiber slivers. In turn, at least 8 laps are fed to the combing machine for combing, from which a drawn fiber sliver with as consistent a mass as possible is produced. In the winding machine, the beginning of the lap sliver, which lies directly against the winding tube, cannot be stretched to the desired mass because this beginning must first be threaded through the various pairs of rollers and therefore cannot be stretched. The lap weight for the first few meters lying on the winding tube is too high.Likewise, the end of the batting sliver, which is on the outside of the lap roll and is the first to be inserted into the combing machine, cannot be stretched to the target weight on the combing machine because it also has to be threaded into the combing machine first. Here, too, the batting weight is too high for the first few meters. This means that the batting roll has a sliver weight that deviates from the target value, at least at the beginning and end of the roll, and this weight must be corrected, for example, by stretching or adjusting the draft of the eight or more combed slivers in the combing machine. For this purpose, each drafting system of the combing machine has several individually driven drafting rollers in the main draft, which entails high investment costs. In combing machines that do not have these individually driven drafting rollers, the weight fluctuations remain in the sliver because they cannot be corrected.

[0003] WO93 / 06275 describes a combing machine in which the sliver mass of the lap roll is assigned to the lap length. The combing machine's control system is designed to compare the sliver mass with a target value and assign it to the lap length. Using this data, the draft or tension of the lap roll in the combing head can be adjusted.

[0004] Accordingly, the invention is based on the object of developing a system and a method for producing a combed fiber sliver such that the fiber sliver produced in the combing machine has a constant fiber mass with little effort.

[0005] The invention solves the stated problem by a system having the features specified in claim 1 and by a method according to claim 7. Advantageous developments of the invention are defined in the dependent claims.

[0006] The invention relates to a system for producing a combed fiber sliver, comprising a winding machine with at least one combing machine, wherein the winding machine is designed to produce a group of several lap rolls from lap sliver for each combing machine. By means of a transport system, the lap rolls can be transported to at least one combing machine and presented to the combing heads. The at least one combing machine is designed to produce a combed fiber sliver from each lap roll, which is subsequently drawn with the other fiber slivers of the combing machine into a single fiber sliver.

[0007] The invention includes the technical teaching that the at least one combing machine has a measuring device configured to measure the deviation in the sliver mass of this one fiber sliver. A control system of the combing machine is configured to compare the sliver mass of this fiber sliver with a target sliver weight and to assign it to the unwinding length of the lap roll. Using this data, the draft and / or tension of the lap roll on the winding machine for the next group of lap rolls for this combing machine can be adjusted based on the roll length.

[0008] The advantage of this process is that all combing machines can be equipped with a simpler and more cost-effective drafting system, whereby only one pair of drafting systems needs to be driven in the main drafting system, yet a constant sliver weight can still be produced. The previous second drive in the main drafting system can be dispensed with in the drafting system, as the sliver weight optimization takes place largely in the winding machine. This results in cost savings, as a drive motor is no longer required on each combing machine, energy savings on the combing machine, and a more compact drafting system design. Ultimately, the combed sliver is optimized due to the 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 from the target sliver weight on the combing machine via the winding length.

[0009] The drafting and / or tensioning on the winding machine can be achieved by controlling at least one drafting system and / or by changing the relative speed between two winding elements. The drafting can advantageously be varied by means of at least one drafting system and / or pressure rollers on the winding machine. Optimizing the sliver mass of one fiber sliver on the combing machine can begin with the drafting systems or pressure rollers by optimizing the drafting and doubling of the incoming fiber slivers or drafting slivers into the winding machine.

[0010] Once the batting has been formed from the feed of the drawstring belts, the tension of the batting can be influenced preferably via the winding rollers, which can form one possible type of winding element.

[0011] Preferably, the data for changing the draft and / or tension on the winding machine can be transferred manually or by means of a system control system from the at least one combing machine to the winding machine. The combing machine control system can, for example, show on the display which length ranges of the batting sliver require an adjustment of the mass of the batting sliver. The operator can enter this into the winding machine control system manually or using a data stick or via tablet or smartphone. Alternatively, a system control system can carry out the data exchange automatically and, using the measured data evaluated in the combing machine control system, control the winding machine for the next set of batting rolls with regard to draft and tension over the roll length.

[0012] The group of lap rolls can be transported to the corresponding combing machine manually, semi-automatically, or automatically via a transport system. During manual transport, the winding machine informs the operator on the control display which combing machine the group of lap rolls should be transported to. During semi-automatic transport, the operator only has to insert the lap rolls from the transport trolley into the combing machine, as the transport trolley is loaded with the group of lap rolls from the winding machine and moved to the corresponding combing machine via the transport system. During automatic transport, the lap rolls are removed from the winding machine, transported to, and inserted into the corresponding combing machine automatically.

[0013] The measuring device is preferably arranged on or in a sliver funnel of the at least one combing machine, wherein the sliver funnel is arranged downstream of a drafting system. The measuring funnel is designed to detect the sliver weight of the fiber sliver at the sliver funnel. The control system of the combing machine determines the deviations from the target sliver weight F of the combed fiber sliver, which are assigned to the unwinding length of the lap. The unwinding length of the lap can be determined by backcalculating the fiber mass at the sliver funnel and the drafts on the combing machine, so that the deviation in the fiber mass can be assigned to the lap length with an accuracy of, for example, several centimeters. The backcalculation takes place in the control system of each combing machine, which either displays the data for the operator or transmits it to the higher-level control system of the system.The data obtained are used to adjust the draft on the winding machine so that the end of the batting sliver, which is first presented to each combing head, is drafted in such a way that a constant sliver weight is achieved.

[0014] The inventive method for producing a combed sliver comprises a winding machine with at least one combing machine, wherein the winding machine produces a group of several lap rolls from lap sliver for each combing machine. This group of lap rolls is transported to the associated combing machine, and a separate lap roll is presented to each combing head. A combed sliver (4 to 16 slivers per combing machine) is produced from each lap roll, which are subsequently stretched into a single sliver. The invention is based on the finding that deviations in the sliver weight from the target value can be compensated for by settings on the winding machine, at least for the next group of lap rolls. The invention is characterized in that the deviation in the sliver mass of one sliver is measured, compared with the target sliver weight, and assigned to the unwinding length of the lap rolls.Using this data, the draft and / or tension on the winding machine for the next group of lap rolls (1) is adjusted over the winding length.

[0015] With the method according to the invention, the process can be optimized through the interaction of two machines in a production line, making the downstream combing machine more cost-effective to manufacture, as a drive in the main drafting section of the drafting system is eliminated. As a result, the combing machine consumes less power, is more cost-effective, and can be constructed more compactly. At the same time, a constant sliver weight can be achieved on the combing machine.

[0016] Preferably, the draft and / or tension adjustment occurs at the beginning and / or end of the unwinding length of each lap of a group of laps. This allows a constant or varying lap weight to be produced for the group of laps over the lap length, thus optimizing the combing process.

[0017] Ideally, the measures described above can be used to produce a constant batt weight over the entire lap length. Alternatively, the system and process can be used to vary the batt weight over the lap length, for example to compensate for a process change on the combing machine. For example, depending on the diameter of the batt, a different winding tension (tension) can be advantageous. An adjusted batt weight can be beneficial for an optimal combing result. When new laps are presented after a lap change on the combing machine, no tension can be applied to the batt lap when the batt sliver is inserted. The usual draft is missing, so that an increased mass of fibers is combed out. In this case, it can be useful to reduce the batt weight on the winding machine over the corresponding length range of the batt sliver by, for example, 3% to 6%.

[0018] Further measures improving the invention are described in more detail below together with the description of a preferred embodiment of the invention with reference to the figures.

[0019] They show: Figure 1: a system for producing a combed fiber sliver; Figure 2: a schematic representation of a winding machine; Figure 3: a schematic side view of a combing head of a combing machine; Figure 4: a schematic top view of a combing machine.

[0020] Figure 1shows a system for producing a combed fiber sliver, with at least one winding machine W, an automatic or manual transport system T, and several combing machines K1 - K6. A winding machine W is fed with fiber or draw frame slivers 9 from several cans 10, which then produces a lap roll 1 for presentation to a combing machine K. The lap roll 1 can be transported manually, semi-automatically, or automatically from the winding machine W to the combing machines K1 - K6 via a transport system T. Manual transport of the lap rolls W can be via a manually movable deposit carriage that can hold at least 8 or more lap rolls for presentation to a single combing machine. Semi-automatic transport can be via an automatically movable deposit carriage that, after an initial loading with lap rolls, automatically moves them to the corresponding combing machine and conveys them into the receiving device there.Automatic transport can be achieved via an overhead conveyor system that removes the appropriate number of lap rolls 1 from an intermediate storage device downstream of the winding machine W and automatically transports them to the feed device of the combing machine and deposits them there. A controller S is configured to compare the operating data of the winding machine W with the operating data of the combing machines K1 - K8 and control them accordingly.

[0021] After Fig. 2a lap roll 1 lies on two winding rollers 2 and 3 (winding calender) of a winding machine W, which can rotate in the direction of the arrow. A lap band 4 (shown in dash-dotted lines) passes through a calender (pressure calender) consisting of at least three pressure rollers 5, 6 and 7, before it runs to the lap roll 1 and is wound up thereon. The lap band 4 is formed in a drafting system 8 of the winding machine W from one or more fed fiber webs or from adjacent drafting belts 9. One or more further drafting systems can be arranged upstream of the drafting system 8. A table calender consisting of two rollers 11, 12 is arranged between the output rollers of the drafting system 8 and the pressure roller 5 of the pressure calender. A deflection roller 13 is arranged in front of the input rollers of the drafting system 8, which deflects fiber or drafting slivers 9 from upstream cans (not shown) and a creel (not shown).A indicates the working direction of the tape winding machine. Arrows B and C indicate the running direction of the drawn stretch tapes 9 and the batting tapes 4, respectively. The direction of rotation of rollers 2, 3, 5, 6, 7, 11, and 12, as well as of the winding 1, is indicated by curved arrows.

[0022] The drafting system 8 can be designed as a 3-over-3 drafting system, i.e., it consists of three lower rollers and three upper rollers. Alternative drafting system concepts, such as a 4-over-3 drafting system, are possible. In the drafting system 8, the fiber composite is drawn from several fiber or drafting slivers 9. The drawn drafting slivers 9 are drawn in direction B as a batting sliver 4 by means of the calender rollers 11, 12 and deflected in direction C.

[0023] 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 speeds. In order to prevent bubbles from forming on the resulting lap roll 1 and to stabilize the distortion on the lap band 4, the winding rollers 2, 3 are driven with a tension of 0 to -5%. This means that one winding roller 2, 3 - preferably the winding roller 3 - is operated at a speed that is up to 5% lower than the winding roller 2. The separately controlled or adjustable speeds allow the winding rollers 2, 3 to be operated at the same or different speeds.By regulating the drives of the winding rollers 2, 3, the tearing process for the rolled-up lap roll 1 can be modified by slightly delaying the winding rollers 2 and 3 and simultaneously stopping the pressure rollers 5, 6, 7, so that the lap band 4 is torn off between the pressure roller 7 and the winding roller 2, but one end still remains between the winding roller 2 and the pressure roller 7, whereby the band winding machine can continue to run automatically after a new core 1a has been inserted. Manual insertion of the lap band 4 is therefore no longer necessary. Manual insertion of the draw frame bands 9 is only necessary when changing cans. Preferably, the pressure rollers 5, 6, 7 are each provided with a separate and controllable or adjustable drive, so that in the event of bubble formation, the distortion between the pressure rollers 5, 6, 7, but also between the pressure roller 7 and the winding roller 2 can be adjusted.The process for producing a cotton roll 1 can thus be further optimized and stabilized, which allows for a higher production speed.

[0024] In Fig. 3a combing head 20 is shown, of which at least eight are mounted on a combing machine. For reasons of clarity, the embodiment is shown and described using only one combing head 20, with the details shown being installed on each of these combing heads except for the common drive units and the sliver deposit. The combing head 20 consists of two winding rollers 21, 22, of which the front winding roller 21 is connected to a gear 23 driven by a motor 24. A lap roll 1 lies on the winding rollers 21, 22, from which the lap sliver 4 is unwound by the rotary movement. The lap sliver 4 can be deflected at a roller 25 and transferred to a feed cylinder 26 of a nipper unit 27. On the roller 25, which here is also driven via the gear 23, there is arranged a pivotally mounted pressure roller 30 which is loaded about a lever 28 via a spring 29.This embodiment with the roller, the spring-loaded lever 28, and the pressure roller is preferably only used for the automatic lap application process and does not have to be a component of every combing machine. The nipper unit 27 can be moved back and forth via levers and is driven by a shaft 31 connected to the gear 23. According to the example shown, the nipper unit 27 is in a forward position and transfers the combed-out fiber tuft to a subsequent pair of detaching rollers 32. A circular comb 33 is rotatably mounted below the nipper unit 27; this comb segment combs out the fiber tuft presented by the closed nippers. The circular comb 33 is also drive-connected to the gear 23. The batting tape 4 is wound onto a winding tube 1a.A ratchet wheel (not shown) is attached to the feed cylinder 26. This ratchet wheel is rotated step by step by the reciprocating movement of the nipper unit 27 by a pawl (also not shown), thereby feeding the cotton strip 4 to the jaws of the nipper for combing. During operation, the cotton strip 4 is continuously unwound over the winding rollers 21, 22 by the rotational movement generated by the cotton roll 1 and passes via the clamping point of the pressure roller 30 with the roller 25 into the area between the clamping point and the feed cylinder 26. The cotton is then fed via the feed cylinder 26 to the jaws of the nipper unit 27 for combing and then delivered to the tear-off rollers 32. The resulting fiber web is combined into a fiber sliver via pairs of take-off rollers 34, 35, 36 and a take-off table 37 and is fed to a drafting system 40 (cf. ) with the fiber slivers also formed on the other combing heads. Fig. 4). The web emerging from the drafting system is gathered into a fiber sliver, the so-called comber sliver, and transferred to a sliver depositor for depositing in a can.

[0025] The combed single-head sliver then runs through the take-off roller pairs 35-37 and is delivered by them in sliver or web form onto the take-off table 37, which is shared by all combing heads of the machine. The short fibers, neps, and impurities removed from the fiber material by the circular comb 33 and a top comb 38 are sucked as so-called noils through a guide shaft into a suction channel shared by all combing heads of the machine. The single-head slivers from the various combing heads of the machine generally run side by side on the take-off table 37 to the shared drafting system 40. A sliver funnel 41 is arranged at the exit of the drafting system, which forms the web into a combing machine sliver, which is then deposited in a can 10.

[0026] Accordingly Fig. 4In the combing machine K shown here, eight combing heads 20 are arranged, each fed by a lap reel 1 with a width of, for example, 300 mm and a fiber mass of 80 ktex. Each lap reel 1 has a length of approximately 300 m of lap sliver 4. The combing heads 20 each produce a combed fiber web from the combed lap sliver 4, which is then gathered into a combed fiber sliver F1 to F8 by a sliver funnel 41. Each fiber sliver F1 to F8 can have a fiber mass of, for example, 11.25 ktex. The sliver funnels 41 are designed as measuring funnels, by means of which the initial sliver mass is determined at each combing head K1 to K8. The fiber slivers F1 to F8 reach the discharge table 39 and run with a total sliver weight of 90 ktex through a drafting system 40 to a further sliver funnel 42, which combines all fiber slivers F1 to F8 into a single fiber sliver, which is deposited in a can 10.The drafting system 40 draws the eight fiber slivers F1 to F8 by a factor of 18 into a single fiber sliver with a sliver weight of, for example, 5 ktex, which is then deposited in the can 10 at a depositing speed of, for example, 230 m / min. The sliver funnel 42 is designed as a measuring funnel, through which the initial sliver weight is determined at the combing machine. The electrical signals from each individual sliver funnel 41, 42 are fed to a control system S via electrical lines.

[0027] Referring to the Figures 1 to 4According to the invention, the sliver weight of the fiber sliver F is recorded at the sliver funnel 42. The deviations from the target sliver weight of the combed fiber sliver F are recorded and assigned to the unwinding length of the lap roll 1. The unwinding length of the lap roll 1 is determined by backcalculating the fiber mass at the sliver funnel 42 and the drafts on the combing machine K, so that the deviation in the fiber mass can be assigned to the corresponding wrap length with an accuracy of, for example, several centimeters. The backcalculation takes place in the control system of each combing machine, which either displays the data for the operator or transmits it to the higher-level control system S of the system. The determined data is used to adjust the draft on the winding machine W so that the end of the lap sliver 4, which is first presented to each combing head 20, is drafted in such a way that a constant sliver weight is achieved.The draft adjustment on the winding machine W for the end of the batting sliver 4 can be performed on the drafting system 8 and / or on the pressure rollers 5, 6, 7. Alternatively or additionally, the winding tension for the beginning of the batting sliver 4 can be adjusted on the winding rollers 2, 3 by increasing the winding tension for this area to 0.5% to 5%. With this winding tension, the winding roller 3 is operated at a speed 0.5% to 5% higher than the winding roller 2, so that the fiber mass for the beginning of the batting sliver 4 decreases.

[0028] According to an alternative not covered by the claims, a pre-tensioning delay can be set and changed on the combing machine K using the winding rollers 21, 22 and the feed roller 26. In a combing machine K with an automatic lap application process, a pre-tensioning delay can also be set and changed between the rollers 25 with the pressure roller 30 and the feed roller 26. In this case, an adjustment of the soldering process is not necessary. This process is not affected by the noil removal, since all the necessary basic settings on the combing machine (fixing comb, circular comb, écartement, etc.) remain unchanged.

[0029] Since each combing machine K1 - K6 is loaded with a group of lap rolls each containing at least eight lap rolls 1, the data on the recorded deviation from the target sliver weight must also be assigned to each combing machine K1 - K6, including eight lap rolls 1. This means that the winding machine W always produces a set of, for example, eight lap rolls 1, which are assigned to the respective combing machine, for example, combing machine K1 here, via the manual, semi-automatic, or automatic transport system. This can be done via a manual setting on the control system of the winding machine W. The operator stores the draft over the produced length of the lap roll 1, taking into account the data on the produced sliver weight of the respective combing machine to be loaded.Alternatively, a controller S can use the data from the deviations from the target sliver weight, for example of the combing machine K1, for the draft and / or tensioning of the winding machine W for the group of eight lap rolls 1 to be produced, which are conveyed by the transport system T to the combing machine K1. After a group of optimized lap rolls 1 has been presented to the combing machine, the sliver weight after the drafting system 40 is again recorded at the sliver funnel 42 and the deviation from the target sliver weight is determined over the unwinding length of the lap roll 1. With this data, the next group of, for example, eight lap rolls 1 on the winding machine W can be further optimized if necessary. Once the combing machine K1 is loaded, the next eight lap rolls 1 can be produced using the data from the combing machine K4, for example, since this is the next one to require a new lap template. The process follows the same procedure as described for the combing machine K1.

[0030] Via the transport system T, the eight lap rolls 1 can be transported, for example manually via a transport trolley by an operator to the respective combing machine K1 - K6, whereby the winding machine W can show the operator on the display for which combing machine K1 - K6 the group of lap rolls 1 is intended.

[0031] In a semi-automatic transport system T, the control system S tells the transport carriage to which combing machine K1 - K6 the group of lap rolls 1 is to be transported. The operator then inserts the group of, for example, eight lap rolls 1 into the combing machine K1 - K6 by hand.

[0032] In an automatic transport system T, for example, the group of eight lap rolls 1 are removed from the storage area after the winding machine W and transported, for example, via a ceiling transport system to the associated combing machine K1 - K6.

[0033] The control system S thus always controls the production of a group of, for example, eight lap rolls 1 with the data on the deviation from the target sliver weight of an associated combing machine K and coordinates the transport of the group of lap rolls 1 to the corresponding combing machine K.

[0034] The advantage of the process is that all combing machines can be equipped with a simpler and more cost-effective drafting system 40, in which only one pair of drafting systems needs to be equipped with a drive in the main drafting system. The previous second drive in the main drafting system can be dispensed with in the drafting system 40, since the optimization of the sliver weight takes place largely in the winding machine. This results in cost savings, as a drive motor on each combing machine is no longer required, energy savings on the combing machine, and a more compact design of the drafting system. Ultimately, the combed sliver is optimized due to the manual or automatic data exchange between at least one combing machine 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 target sliver weight on the combing machine K1 - K6 via the winding length.

[0035] Depending on the design of the combing machine, it can currently accommodate a group of 4 to 16 lap rolls 1, all of which are produced with the same parameters regarding drafting or tensioning in the winding machine W. Depending on the design of the winding machine W, it can be equipped with two winding rollers 2, 3, with one or more winding rollers and a winding belt, or only with a winding belt. What all types of winding machines W have in common is that the produced lap strip 4 can be drafted, for example, by means of drafting systems and / or its speed / rotational speed (tensioning) can be influenced via the relative movement between two winding elements.

[0036] Ideally, according to the invention, a constant batt weight can be produced over the entire lap length. Alternatively, the system and the method enable a varying batt weight over the lap length, for example to compensate for a process change on the combing machine. For example, depending on the diameter of the batt, a different winding tension (tension) can be advantageous. An adapted batt weight can be beneficial for an optimal combing result. When new laps are presented after a lap change on the combing machine, no tension can be applied to the batt lap 1 when the batt ribbon 4 is inserted. The usual draft is missing, so that an increased mass of fibers is combed. In this case, it can be useful to reduce the batt weight on the winding machine W over the corresponding length range of the batt ribbon by, for example, 3% to 6%. Reference symbol

[0037] 1Cotton roll 1aWinding tube 2, 3Winding roller 4Cotton tape 5, 6, 7Pressure roller 8Drafting system 9Drafting tape 10Can 11, 12Roller table calender 13Deflection roller 20Combing head 21, 22Winding roller 23Gearbox 24Motor 25Roller 26Feed cylinder 27Tong unit 28Lever 29Spring 30Pressure roller 31Shaft 32Tear-off rollers 33Circular comb 34, 35, 36Take-off rollers 37Take-off table 38Fixing comb 39Outlet table 40Drafting system 41Sliver funnel 42Sliver funnel A, B, CLantern direction of batt sliver F, F1 - F8Fiber sliver K, K1 - K6Comber SControl TTransport system WWinding machine

Claims

1. System for producing a combed fibre sliver (F), comprising a winding machine (W) having at least one combing machine, wherein the winding machine (W) is configured to produce for each combing machine a group of a plurality of lap rolls (1) from lap sliver (4), having a transport system (T) which is configured to transport the lap rolls (1) to at least one combing machine and to feed them to the combing heads (20), wherein the at least one combing machine is configured to produce a combed fibre sliver from each lap roll (1), wherein the fibre sliver or slivers is / are subsequently drawn to form a single fibre sliver (F), wherein the at least one combing machine has a measuring device which is configured to measure the deviation of the sliver mass of the fibre sliver (F), wherein a controller of the combing machine is configured to compare the sliver mass of the fibre sliver (F) with a desired sliver weight and to allocate it to the discharge length of the lap roll (1), characterised in that, by means of these data, the draft and / or tension of the lap sliver (4) can be adjusted at the winding machine (W) for the next group of lap rolls (1) for this combing machine via the lap length, wherein the draft and / or tension takes place at the winding machine (W) by means of an actuation of at least one drawing unit and / or the change in the relative speed between two winding elements.

2. System according to claim 1, characterised in that the draft can be changed by means of at least one drawing unit (8) and / or by means of pressure rollers (5, 6, 7).

3. System according to claim 1, characterised in that the winding elements are in the form of winding rollers (2, 3).

4. System according to claim 1, characterised in that the data relating to the change of the draft and / or tension at the winding machine are transmitted manually or by means of a controller (S) of the system.

5. System according to claim 1, characterised in that the group of lap rolls (1) are transported to the associated combing machine (K1 - K6) manually, semi-automatically or automatically by means of a transport system (T).

6. System according to claim 1, characterised in that the measuring device is arranged at or in a sliver funnel (42) of the combing machine (K1 - K6), wherein the sliver funnel (42) is arranged downstream of a drawing unit (40).

7. Method for producing a combed fibre sliver (F), comprising a winding machine (W) having at least one combing machine, wherein the winding machine (W) produces for each combing machine a group of a plurality of lap rolls (1) from lap sliver (4), which lap rolls are transported to the combing machine and fed to combing heads (20), wherein a combed fibre sliver is produced from each lap roll (1), and the fibre sliver or slivers is / are subsequently drawn to form a single fibre sliver (F), wherein the deviation of the sliver mass of the fibre sliver (F) is measured, compared with the desired sliver weight and allocated to the discharge length of the lap roll (1), characterised in that, by means of these data, the draft and / or tension of the lap sliver (4) is adjusted at the winding machine (W) for the next group of lap rolls (1) via the lap length, wherein the draft and / or tension takes place at the winding machine (W) by means of an actuation of at least one drawing unit and / or the change of the relative speed between two winding elements.

8. Method according to claim 7, characterised in that the adaptation of the draft and / or tension takes place at the start and / or at the end of the discharge length of each lap roll (1) of a group.

9. Method according to any one of claims 7 to 8, characterised in that the group of lap rolls (1) has a constant or different lap weight over the lap length.

10. Method according to claim 7, characterised in that the data relating to the change of the draft and / or tension at the winding machine are transmitted manually or by means of a controller (S) of the system.

11. Method according to claim 7, characterised in that the group of lap rolls (1) are transported to the associated combing machine (K) manually, semi-automatically or automatically by means of a transport system (T).