CN110158203B

CN110158203B - Method for operating a lap winder and lap winder operated therewith

Info

Publication number: CN110158203B
Application number: CN201910114477.5A
Authority: CN
Inventors: 托马斯·施密茨
Original assignee: Truetzschler GmbH and Co KG
Current assignee: Trutschler Group Europe
Priority date: 2018-02-16
Filing date: 2019-02-14
Publication date: 2021-11-26
Anticipated expiration: 2039-02-14
Also published as: DE102018103543A1; CN110158203A

Abstract

The invention relates to a method for operating a lap winder (1), wherein a lap (3) of predetermined dimensions is first formed. A thin section (7a) is then formed in the sliver (7) between the inlet of the device of the compacting rolls (5a-5c) of the sliver lap and a fixed position arranged upstream of the inlet in the sliver transport direction. The sliver wound onto the bobbin (2) is then torn off from the remaining sliver located in the sliver lap in the region of the thin section. The coiler has a drafting device and a compacting roller (5a-5 b). The compacting roller is provided and set up with a lap unit (4a, 4b) for consolidating the sliver from the drafting unit and feeding it to the lap-winder. The cotton roll device is further provided and set up for rotating the bobbin which is arranged along the strip transport direction (12) and winding the cotton sliver from the pressing roller device on the bobbin. The sliver lap has a holding device which is arranged at a fixed position and is set up for holding an incoming sliver or for releasing the sliver in the sliver transport direction depending on the operating state. The coiler is set up for operating according to the method described above.

Description

Method for operating a lap winder and lap winder operated therewith

Technical Field

The invention relates to a method for operating a lap winder and a lap winder operated therewith.

Background

Lap-winders are known per se. The sliver lap introduces a fiber sliver from a plurality of cans, for example 24 cans, places the fiber sliver side by side as viewed in the transport direction as a fiber sliver, drafts the fiber sliver thus formed in a drafting device to form a flat sliver and transports the sliver in the sliver transport direction through a device with usually three compacting rollers to a device with usually two lap rollers. The compacting roller consolidates the sliver from the drafting device and extrudes air. The bobbin to be wrapped is arranged on the lap roller in a leaning way. The consolidated sliver from the compacting roller moves away from the compacting roller between the lap roller and the bobbin. Due to the weight of the bobbin, the sliver reaches the surface of the bobbin, which is in rotation due to the friction of the lap rollers. Here, the remaining air is forced out of the tampon and the increasing weight of the gradually wound bobbin, based on the winding, is directed to the known sliver. If the bobbin is completely wound, the sliver must be separated upstream of the sliver lap in the sliver transport direction.

It is known from WO2010/070608a1 to grip a sliver between two rollers, the grip point being very close to the outside of the roll. Tearing of the tampon should be carried out by means of lifting and slow rotation of the roll. A disadvantage is that, in order to achieve the tearing effect as a whole, the sliver has to be lifted to such an extent that the sliver between the nip and the lap roller arranged next to the pressure roller loses its contact with the transport belt. The transport belt is used for transporting the cotton sliver to the winding bobbin of the sliver lap. This requires a combined lifting and driving mechanism, which makes the entire structure very complex and expensive. In addition, the sliver to be separated also partially rests against the pressure roller and/or the adjacent lap roller in the region between the nip and the lap. This results in the sliver being separated by the friction of the respective roller. This results in that a smooth tear-off edge as claimed in WO2010/070608a1 cannot be achieved.

The worn ends of the separated sliver are not conducive to the subsequent combing process. In the combing process, the free end of the lap becomes the starting end. Said starting end is connected to the end originating from the previous sliver placed in the combing machine. If this starting end is worn, the tampon is only connected with difficulty over the entire width with the above-mentioned end of another tampon. In particular, this makes it difficult or even completely impossible for continuous combing to overcome the lap boundaries to attach one sliver end automatically to the other sliver end (also referred to as "auto lapping").

In addition to this, the very short distance between the grip and the roll can lead to individual fibers being torn apart when the tampon is torn open. This leads to waste products under working conditions which must be removed in the combing process and thus unnecessarily reduce the specific weight of the good fibres.

Disclosure of Invention

The object of the invention is to overcome the above-mentioned disadvantages.

This object is achieved by the subject matter of claims 1 and 11. Advantageous further developments of the invention are given in the dependent claims.

According to the invention, a method for operating a lap winder is provided, said method having a first step of forming a lap of predetermined size. This step is prior art and therefore not described further. In a second, following step, the sliver for the roll is fixed in a predetermined fixed position. The fixing position is arranged upstream of the lap and upstream or downstream of the device of the pinch roller of the lap machine in the direction of transport of the strip. In a next third step, the sliver is stretched between a fixed position and a means of a compacting roller, thereby forming thin sections in the sliver. Finally, in a fourth, subsequent step, the sliver of the sliver reel wound onto the barrel is torn off from the remaining sliver located in the sliver lap in the region of the thin section. This setting has the advantage that the sliver is torn at a precisely defined position, i.e. in the region of the thin section. In this connection, the risk of wear at the tear is reduced and the quality of the aforementioned connections to other tampons is improved.

Furthermore, the method may have an additional step between the third and fourth steps for the case where the fixing position is arranged upstream of the device of the compacting roller in the strip transport direction. In this step, the tampon is transported further so far until the thin section is at the predetermined tear position. This position is located according to the invention between the outlet of the device of the compacting roller and the lap device arranged downstream of this outlet in the direction of strip transport. Within the scope of the invention, a lap device is considered as a component which is essential for the use of an incoming sliver-containing bobbin. In the simplest case, the lap device has two lap rollers. In this case, the tear-off position is located between the outlet opening given and the nearest lap roller of the lap arrangement. It is thereby possible to also force air out of the thin section by means of the nip roller, which is advantageous for the subsequent combing process.

In any of the foregoing methods, the third step may have a plurality of substeps. In a first partial step, the pressing roller is stopped. This results in fixation of the tampon. In a second partial step, the fixation of the tampon is carried out at a fixation position. The two substeps may be carried out in any order or simultaneously with each other. In a third, subsequent step, the sliver is stretched between a fixed position and a device of a pressure roller until a thin section is produced. This ensures a reliable construction of the thin section, more precisely at the desired position in the tampon.

The third dividing step may include increasing the spacing between the fixed location and at least two nip rollers closest to the fixed location. This can be achieved by moving the pressure roller and/or the fastening point away from the respective other element, i.e. the fastening point or the pressure roller. Such motion may include oscillating and/or (e.g., linear) movement along a motion path. This is technically simple to implement and, for example, also limited by stops, movements which can also be carried out automatically.

Alternatively or additionally, stretching may be achieved in such a way that the two closest pressing rollers rotate in a direction which causes a movement of the sliver away from the fixation position. If the web is produced upstream of the pinch roller device in the web transport direction, the pinch roller is rotated in the web transport direction for forming the web roll, otherwise the other rotation is reversed. In any case, no special structure is required for the stretching, since the existing components are already put into motion.

Again additionally or alternatively, the third dividing step may involve movement of the tampon away from at least the two closest compacting rollers at a fixed position. That is, the tampon is removed from said compacting roller at a (fixed) fixed position and is thereby automatically stretched, which results in a thin section. This has the advantage that the pinch rollers do not have to be additionally operated to form the thin sections; the compacting roller is always only used for squeezing out excess air from the tampon and for the further transport of the tampon.

In any of the foregoing methods, the fourth step may include removing the exposed sliver disposed between the means for the pinch roller and the lap means from the sliver lap or running the lap means of the sliver lap in a sliver transport direction. Such a movement therefore allows the incoming sliver to be transported to the bobbin to be wound and, according to the invention, to be carried out such that the exposed sliver tears off in the region of the thin sections. This can be achieved by stopping the lap arrangement in the first case, i.e. without transporting the sliver, and for example rotating the compacting roller counter to the sliver transport direction. In the second case, the compacting roller is stopped or rotated counter to the strip transport direction and the lap device is run in the strip transport direction as described above. In both cases, the tearing is effected by means of already existing elements of the coiler, which is cost-effective.

Each of the above mentioned methods may comprise an initial step before the first step. In this step, a predetermined minimum distance is set between the device of the pressure roller and the fastening point. This enables the location of the thin section to be specified exactly as desired for the respective application case.

The shortest distance is preferably greater than the predetermined maximum fiber length of the fibers that may be in the tampon and is furthermore so small that thin sections are produced at predetermined forming positions in accordance with predetermined accuracy requirements. This can be achieved to prevent individual fibres from being torn apart when the tampon is torn open. Thereby, the risk of unnecessary waste products when separating the tampon is reduced.

The inventive sliver lap machine comprises a drafting device, a compacting roller and a lap device. The pressure rollers are arranged in a known manner and set up a lap arrangement for reinforcing the sliver from the drafting arrangement and for supplying it to the lap winder. The cotton roll device is also provided in a known manner and is set up to rotate the bobbin in the strip transport direction and to wind the cotton sliver from the pressure roller onto the bobbin. Thereby producing a roll of strip. Furthermore, the sliver lap has a fixing device which is arranged at a fixed position. The fastening point is arranged according to the invention between the drafting device and the device of the pressure roller or between the device of the pressure roller and the lap device. The holding device is designed to hold the tampon in the operating state or to release the tampon at least in the direction of transport of the tampon. The coiler is in turn set up for operation according to one of the methods described above.

The lap apparatus preferably has two lap rollers. The lap roller is arranged and set up to rotate the bobbin resting on the lap roller in the sliver transport direction and to wind the sliver of the pressure roller onto the bobbin. This corresponds to the usual winding process.

Preferably, the coiler has a drive. The driving means are configured to stretch the tampon according to the third step described above. The sliver lap is thus able to perform the separation according to the invention of the sliver automatically and without human intervention.

If said method of operating a reel-up comprises increasing the distance between the fixing location and at least two closest pressing rolls to the fixing location, this is preferably achieved according to the invention in that the fixing means are arranged to be removable from at least the two closest pressing rolls. Thus, the operation of the press roll and the configuration of the press roll device are not changed.

Alternatively or additionally, the device of the pressing rollers is arranged movably such that a movement in the direction of separation causes the two closest pressing rollers to move away from the fastening position. Since the pressure rollers are usually arranged in a positionally fixed manner relative to one another on account of their usual drive technology, the supports can be arranged so as to be displaceable (for example pivotably) that their movement causes the aforementioned separation. Thus, a simple configuration and thus a low-cost configuration can be achieved.

If said method of operating a sliver lap comprises rotating at least said two closest pinch rollers in a direction causing a distancing movement of the sliver away from the fixed position, said fixation means preferably comprises two rollers. The two rollers are set up to fix the sliver in the fixed state and to rotate in such a way that the fixed sliver is removed by the two closest pressing rollers. Here, only one roller needs to be driven. The other roller rotates together based on the contact pressure against the sliver.

Any of the aforementioned reels preferably has a control device or is coupled with such a control device. The control device is set up for operating the lap winder according to any of the preceding methods. This makes it possible, for example, to adjust the coiler centrally for a minimum distance.

Drawings

Further features and advantages of the invention result from the following description of a preferred embodiment. Wherein:

figure 1 shows a reel-up according to a first embodiment of the invention in a first operating condition,

figure 2 shows a part of the reel-up of figure 1 in other operating conditions,

figure 3 shows a part of a lap machine according to a second embodiment of the invention in two operating conditions,

figure 4 shows a detail of a lap-winder according to a third embodiment of the invention,

figure 5 shows a detail of a reel-up according to a fourth embodiment of the invention,

figure 6 shows a part of a reel-up according to a fifth embodiment of the invention in different operating situations,

figure 7 shows a detail of a coiler according to a sixth embodiment of the present invention,

figure 8 shows a detail of a reel-up according to a seventh embodiment of the invention,

fig. 9 shows a method for operating a lap winder according to an embodiment of the invention, and

fig. 10 shows the process of creating the thin section of fig. 9 in more detail.

Detailed Description

Fig. 1 shows a reel-up 1 according to a first embodiment of the invention and has only parts that are important for the invention. For the sake of clarity, other components, such as the guide frames, drafting devices, etc., are not shown.

The sliver 7 comes from a drafting device, not shown, here indicated by the blank end on the right, and passes through a compacting device, here provided with three compacting rollers 5a-5 c. The pinch rollers 5a-5c are driven in the usual manner and are freely rotatably mounted on the carriage 6. Here, the compacting

rollers

5b, 5c form the inlet E of the compacting roller arrangement at their area facing the free end of the sliver 7. The sliver leaves the compacting roller arrangement at the outlet a of the arrangement and contacts the nearest lap roller 4b of the lap arrangement, not further indicated, which here is in the form of an arrangement with two

lap rollers

4a, 4 b. The sliver 7 passes through the lap rollers to the bobbin 2, thus forming a lap 3.

In the sliver transport direction between the drafting device and the inlet E, the two

clamping elements

8a, 8b are arranged such that they do not come into contact with the sliver 7 in the released state shown here.

For separating the tampon 7, the two

grip elements

8a, 8b are preferably moved towards each other in the

respective direction

9a or 9 b. Here, the pinch rollers 5a-5c are stopped.

Fig. 2a shows a detail of the region B enclosed in fig. 1: the condition of the reel 1 after the

clamping elements

8a, 8b have moved towards each other. In the fixed state thus achieved, the

clamping elements

8a, 8b fix the tampon 7 between them, so that the tampon cannot move in the ribbon transport direction, at least in the clamping position.

In this state, the carriage 6 is swung in the direction 10 a. The axis of oscillation illustratively coincides with the axis of rotation of the pinch roller 5 c. The pivot axis may also be provided elsewhere. This axis of oscillation need only be located on one side of one of the

gripping elements

8a, 8b with reference to the tampon 7. The pivot axis is therefore now located on the side of the clamping element 8 b.

Further, the pinch rollers 5a-5c continue to stop.

Fig. 2b shows the situation of the reel-up 1 after the oscillation of the carriage 6. As can be seen, the tampon 7 between the grip and the inlet E becomes thinner; this forms the thin section 7 a.

In this state, the two

clamping elements

8a, 8b are preferably moved away from one another in the

direction

9a or 9b, so that the tampon 7 is released again here.

Subsequently or simultaneously, the stand 6 is swung back in the direction 10b into the position shown in fig. 1.

Fig. 2c shows the situation in which the carriage 6 is swung back to the rear lap winder 1.

In this state, the sliver 7 is transported further in the sliver transport direction through the compacting roller arrangement. As in the case of the formation of the lap 3, this is also effected by the rotation of the pressure rollers 5a to 5c in the respective associated direction of

rotation

11a, 11b or 11a and the rotation of the

lap rollers

4a, 4b in the direction 12. This is done until the thin section 7a is located between the pinch roller 5a or the exit a of the pinch roller arrangement and the nearest lap roller 4 b.

Fig. 2d shows the state of the lap machine 1 when the thin section 7a is located between the exit a and the lap roller 4 b.

Now for tearing the sliver 7, the pressure rollers 5a-5c are stopped or, as shown here, rotated in a

different direction

11b, 11a or 11b, respectively, than in fig. 2 c. At the same time, the

lap rollers

4a, 4b can be stopped. During this process, the tampon 7 tears at the thin section 7 a.

Alternatively, the

lap rollers

4a, 4b each continue to rotate in the direction 12, so that the now rear free end of the sliver 7 to be wound is transported further toward the bobbin 2 and thus toward the lap 3. The tampon 7 is thus wound onto the barrel 2 without interruption.

Fig. 2e shows the state of the sliver lap 1 shortly after the tear of the sliver 7. The compacting rollers 5a-5c are stopped and the

lap rollers

4a, 4b are (continued) rotated in the direction 12, so that the remaining portion of the sliver 7 to be wound is transported onto the bobbin 2.

Fig. 3 shows a lap winder 1 according to a second embodiment of the invention in two operating states and in a section according to area B of fig. 1.

Here, the structural configuration corresponds to the lap winder 1 according to the first embodiment of the present invention. Only the axis of rotation of the support 6 is different. Said axis of rotation is located on the opposite side of the sliver 7 fed into the compacting roller arrangement to the first embodiment and coincides, for example, with the axis of rotation of the compacting roller 5 a.

Fig. 3a shows an operating state of the support 6, which corresponds to the operating position according to fig. 2 a. The curved thick arrow above indicates the current direction of rotation 10b of the carrier 6 in order to produce a thin section.

Fig. 3b shows an operating state corresponding to fig. 2b, which is shortly after the thin section 7a is produced. Similarly to fig. 2b, the curved thick arrow above shows the direction of rotation 10b of the carrier 6 opposite to the direction 10a in order to achieve the operating state shown in fig. 2 c.

Fig. 4 shows a coiler 1 according to a third embodiment of the invention in the area B according to fig. 1.

As can be seen, the

clamping elements

8a, 8b are replaced by two clamping

rollers

13a, 13 b. Furthermore, the pinch roller 13b is exemplarily only arranged to be movable towards the pinch roller 13a (for pinching the tampon 7) and to be movable away therefrom again (for releasing the tampon 7). The double arrows here represent the two directions of movement 9 of the pinch roller 13b here.

Fig. 5 shows a lap winder 1 according to a fourth embodiment of the invention in a detail according to the area B in fig. 1.

As can be seen, the

clamping elements

8a, 8b are fastened on the support device 14 by way of example and are arranged movably in said support device, for example according to fig. 1. The support means 14 is arranged to be movable towards and away from the inlet E, which is indicated by means of the double arrow shown, which arrow thus represents the direction of movement 15 of the support means 14.

This means that, in the example shown, the compacting rollers 5a-5c are stopped and the support means 14 are moved away from the inlet in order to create thin sections in the tampon 7. However, it is also possible to rotate the compacting rollers 5a-5c according to fig. 2 c.

Fig. 6 shows a reel 1 according to a fifth embodiment of the invention in a detail according to area B in fig. 1 and in a different operating state. Unlike the above described embodiments, there is no fixing means upstream of the inlet E of the means of the compacting rollers 5a-5 c. Instead, the fastening device is arranged downstream of the pinch roller device in the strip transport direction, i.e. downstream of the outlet a of the pinch roller device.

Fig. 6a shows a situation similar to fig. 1 for a reel-up 1. The clamping element 8 is arranged between the outlet a and the lap roller 4b in such a way that it can be moved in the direction 16a toward the lap roller 4b in order to clamp the sliver 7, for example, by means of the lap roller 4b and thus fix it.

Fig. 6b shows the state of the lap machine 1 after the movement of the clamping element 8 towards the lap roller 4 b. In the fixed state thus achieved, the clamping element 8 and the lap roller 4b thus clamp the sliver 7 between them, so that said sliver cannot move in the clamping region.

In this state, the support 6 is pivoted, as shown in fig. 2a, in the direction 10 a. The pivot axis here again coincides with the axis of rotation of the pressing roller 5c, for example. The pivot axis may also be provided elsewhere. The swing axis need only be provided to the right of the rotation axis of the pressing roller 5 a.

Here, the pinch rollers 5a-5c are stopped.

Fig. 6c shows a situation similar to fig. 2b of the reel-up 1 after the oscillation of the support 6. The sliver 7 between the pressure roller 5a and the grip element 8 is exposed. In this state, the pinch rollers 5a-5c are rotated in the

direction

11b, 11a, or 11b against the strip transport direction.

Fig. 6d shows the (intermediate) condition of the reel-up 1 shortly after the construction of the thin section 7 a.

The compacting rollers 5a-5c are stopped briefly or rotated continuously counter to the sliver transport direction, so that the sliver 7 is torn off in the region of the thin section 7 a.

Fig. 6e shows the state of the sliver lap 1 shortly after the tear of the sliver 7.

The pinch rollers 5a-5c are stopped.

The clamping element 8 is moved back in the direction 16b and thus away from the lap roller 4 b. Thus, the free end of the roll 3 is now released.

Fig. 6f shows the condition of the reel 1 after the distancing movement of the gripping element 8.

Depending on the sliver transport direction, the

lap rollers

4a, 4b rotate in direction 12 and wind the remaining portion of the sliver 7 arranged on the left in fig. 6f onto the bobbin 2.

Fig. 6g shows the state of the sliver lap 1 shortly after the free end of the sliver 7 to be wound passes the clamping element 8.

In this state, the carriage 6 is swung back again in the direction 10b until it reaches the position according to fig. 6 a.

Fig. 7 shows a coiler 1 according to a sixth embodiment of the invention in a detail according to area C in fig. 1.

The lap winder 1 differs from the previous embodiment in that the clamping element 8 is replaced by a clamping roller 13. The pinch roller 13 illustratively has a circular cross-section transverse to its axis of rotation R. The axis of rotation R is arranged eccentrically with respect to the cross-section. The clamping roller 13 can thus be rotated towards the lap roller 4b towards the fastening position and rotated away from this lap roller again.

Fig. 8 likewise shows a lap winder 1 according to a seventh embodiment of the invention in a detail according to area C in fig. 1.

The cross section of the clamping roller 13 is non-circular and can therefore rotate autonomously towards the lap roller 4b towards the fastening position and away from it again when the axis of rotation R is centered. The pinch roller 13 may for example have an oval cross-section.

With the aforementioned embodiment, a very simple and still effective method for running a lap winder is possible, which is shown in fig. 9.

After the start in step S1, step S2 of adjusting the above-described pitch is preferably performed.

After step S1 or after step S2 (if present), first, a roll 3 of a predetermined size is typically formed in the next step S3. This dimension is known as the length of the tampon 7 that should be wound onto the barrel 2. Step S3 is known and will not be explained further.

After the size is reached, the tampon 7 is fixed in a predetermined position in the next step S4. This is achieved in the previously described coiler 1 by means of the

elements

8, 4 b; 8a, 8 b; 13. 4 b; 13a, 13 b.

If the sliver 7 is stationary, a thin section 7a of the sliver 7 is formed in the following step S5, preferably by means of the previously mentioned coiler 1. According to the invention, this is achieved by pulling the sliver 7 between a fixed position and the means of the compacting rollers 5a-5 c.

If the thin section 7a is formed, the tampon 7 is separated at this thin section 7a by tearing in a subsequent step S6.

In step S7, an advantageous, automatically performed, automatic bobbin change is then preferably carried out in that the bobbin with the sliver 3 is replaced by an empty bobbin. This is also known per se and will not be explained further.

Next, in the example shown, it is checked in step S8 whether a readjustment of the pitch is required due to a change in the maximum fiber length.

If this is the case (yes-branch after step S8), a jump is made back to step S2. Otherwise (no branch after step S8) the process jumps back to step S3, so that the next reel 3 can be formed without stopping.

Fig. 10 shows in more detail the process shown in step S5, which is the process of fig. 9 of producing the thin section 7 a.

In a first substep S9, the compacting rollers 5a-5c are stopped, so that the sliver 7 is automatically fixed thereby.

In a subsequent substep S10, the tampon 7 is actually fixed in a fixed position.

In a final substep S11, the sliver 7 between the fastening point and the arrangement of the pressure rollers 5a-5c is stretched in this way until a thin section 7a is produced. This can be fixedly predefined in the programming and/or dependent on the sensor. The sensor is preferably designed to detect, preferably without contact, the width dimension of the tampon 7 in the region of the thin section 7a to be formed and to transmit a signal to the control device when (fully) the thin section 7a is formed.

The present invention is not limited to the above-described embodiments.

A clamping member 8; 8a, 8 b; 13; 13a, 13b can be interchanged and freely combined with each other.

Instead of or in addition to the described type of movement, the holder 6 or the clamping element 8 can be set; 8a, 8 b; 13; 13a, 13 b.

Instead of the holder 6, one or a group of the pressing rollers 5a-5c may also be provided to be movable.

In addition to the pivoting movement, each movement can be realized by means of known guides and/or by means of a sliding guide, as is known, for example, for the bolt guide and/or the bolt guide in door locks.

The movement can be initiated either manually or automatically. In the second case, there may be a sensor for determining when sliver 7 is separated, i.e. when roll 3 is full. For example, a movement limit can be set for a moving component in the form of an end stop and/or a sensor.

A clamping element 8; 8a, 8 b; 13; 13a, 13b may vary in form.

The lap apparatus may also be configured differently. Instead of the

lap rollers

4a, 4b, it is also possible, for example, to provide one or more belt-like conveyor belts which each partially enclose the bobbin 2. The tampon 7 is wound onto the bobbin 2 in a known manner passing between the belt/belts and the bobbin 2. The invention is therefore completely independent of the embodiment of the winding method or of the lap apparatus.

List of reference numerals

1 strip winding machine

2 bobbin

3 roll

4a, 4b lap roller

5a-5c compacting roller

6 support

7 cotton sliver

7a thin section

8; 8a, 8b clamping element

9; 9a, 9b direction of motion

10a, 10b swing direction

11a, 11b, 12 direction of rotation

13; 13a, 13b pinch roller

14 support device

15; 16a, 16b direction of movement

A outlet of pressing roller device

B. C region

E press roll device inlet

R axis of rotation

Si; step of S belonging to N

Claims

1. Method for operating a lap winder (1), comprising

● to form a roll (3) of predetermined dimensions (S3),

● a following second step (S4) of fixing the tampon (7) for the roll in a predetermined fixed position, said fixed position being set in the direction of transport of the sliver as follows:

-arranged upstream of the roll and

-upstream or downstream of the devices of the compacting rollers (5a-5c) of the lap-winder (1),

● A third subsequent step (S5) of forming a thin section (7a) in the tampon (7), said thin section being formed by means of stretching the tampon (7) between a fixed position and a set of pinch rollers (5a-5c), and

●, a fourth step (S6) in which the sliver (7) of the sliver reel (3) wound onto the bobbin (2) is torn off from the remaining sliver (7) present in the sliver lap (1) in the region of the thin section (7 a).

2. A method according to claim 1, further comprising, in the case where the fixed position is arranged upstream of the means of the compacting roller (5a-5c) in the strip transport direction, an additional step between the third step and the fourth step, in which the transport of the sliver (7) is continued until the thin section (7a) is at a predetermined tear-off position, said tear-off position being arranged between the outlet of the means of the compacting roller (5a-5c) and one of the lap means (4a, 4b) arranged downstream of the outlet in the strip transport direction.

3. The method of claim 1, wherein the third step (S5) comprises

● a first sub-step (S9) in which the pressing rollers (5a-5c) are stopped, thereby fixing the sliver (7),

● fixing the tampon (7) at a fixed position (S10), and

● third substep (S11) in which the sliver (7) is stretched between a fixed position and a set of pinch rollers (5a-5c) until a thin section (7a) is created.

4. The method of claim 2, wherein the third step (S5) comprises

● fixing the tampon (7) at a fixed position (S10), and

5. A method according to claim 3 or 4, wherein the third dividing step (S10) comprises increasing the spacing between the fixing location and at least two of the compaction rollers (5b, 5c) closest to the fixing location.

6. The method according to claim 5, wherein the third partial step comprises rotating at least the two closest compacting rollers (5b, 5c) in a direction causing the sliver (7) to move away from the fixation position.

7. The method according to claim 5, wherein the third dividing step comprises moving the sliver (7) away from at least the two closest compacting rollers (5b, 5c) at a fixed position.

8. Method according to one of claims 1 to 4, wherein the fourth step comprises moving the exposed sliver (7) arranged between the means of the compacting rollers (5a-5c) and the lap means (4a, 4b) away from the sliver reel (3) or running the lap means (4a, 4b) of the sliver lap (1) in the sliver transport direction (12) such that the exposed sliver (7) tears off in the area of the thin section (7 a).

9. Method according to one of claims 1 to 4, having an initial step (S2) before the first step, in which a predetermined minimum spacing between the device of the pressing rollers (5a-5c) and the fixing location is adjusted.

10. The method of claim 9, wherein the minimum spacing

● is greater than the predetermined maximum fibre length of fibres that may be present in the tampon (7), and

● is so small that a thin section (7a) is produced at a predetermined forming position in accordance with predetermined accuracy requirements.

11. The method according to one of claims 1 to 4,

● also has a fifth step (S8) after the fourth step (S6), in which the bobbin (2) with the lap (3) is replaced by a new bobbin (2),

● wherein, after the fifth step (S8) ends, a jump is made back to the second step (S3).

12. A strip-rolling machine (1),

● is provided with a plurality of air holes,

-a drawing device for drawing the fiber web,

-a compacting roller (5a-5c) which is provided and set up with a lap arrangement (4a, 4b) for consolidating the sliver (7) from the drafting arrangement and for feeding it to the lap machine (1),

a lap arrangement (4a, 4b) which is provided and set up for,

rotating the bobbin (2) in the strip transport direction and

here, the sliver (7) from the pressure rollers (5a-5c) is wound onto the bobbin (2), and

-a fixing means (8; 8a, 8 b; 13; 13a, 13 b; 14),

the fixing means are arranged at a fixed position,

the fixing position is between the drafting device and the device of the pressing roller (5a-5c), or

The fixing position is between the device of the pressing rollers (5a-5c) and the cotton roll device (4b), and

the holding device is designed to hold the tampon (7) or to release the tampon at least in the direction of transport of the tampon, depending on the operating state, and

● the reel set up for operation in accordance with the method of one of the preceding claims.

13. A lap machine (1) according to claim 12, wherein a lap arrangement (4a, 4b) has two lap rollers (4a, 4b) arranged and set up for,

● the bobbins (2) resting on the lap rollers (4a, 4b) are rotated in the strip transport direction (12) and

● the sliver (7) coming from the pressure rollers (5a-5c) is wound onto the bobbin (2).

14. A sliver lap machine (1) according to claim 12, having drive means configured to stretch the sliver according to a third step.

15. A sliver lap machine (1) according to claim 13, having drive means configured to stretch the sliver according to a third step.

16. A lap machine (1) according to one of claims 12 to 15, set up for operating additionally according to the method according to claim 5 in such a way,

● the fixing means (8; 8a, 8 b; 14; 13; 13a, 13b) are arranged at least to be removable from the two closest compacting rollers (5a-5c) and/or

● the means of pressing the rollers (5a-5c) are arranged movably so that a movement in the direction of departure causes the two closest pressing rollers (5a-5c) to depart from a fixed position.

17. A lap winder (7) according to one of claims 12 to 15, set up for operating additionally according to the method according to claim 6, in such a way that the fixing means (13; 13a, 13b) comprise two rollers (13; 13a, 13b) set up for, in the fixed state:

● fix the cotton sliver (7), and

●, so that the fixed sliver (7) is removed from the two closest compacting rollers (5a-5 c).

18. A lap winder (1) according to one of claims 12 to 15, further having or coupled with a control device set up for operating a lap winder (1) according to the method according to one of claims 1 to 11.