Drafting device, spinning station and method

Abstract

The invention relates to a drafting device for a textile machine, in particular an air-jet spinning machine, wherein the drafting device can have several pairs of rollers that can be driven independently of one another. The roller pairs can be designed and arranged to guide a fiber ribbon between an upper roller and a lower roller of each pair during their rotational operation in order to stretch the fiber ribbon. The drafting device can be designed and configured to carry out a spin-up process after the fiber ribbon has been cut within the drafting device. To optimize the spinning process, the drafting device is designed and configured to selectively add at least two pairs of rollers via their drives during the spin-up process.

Description

[0001] The invention relates to a drawing device. The invention relates to a spinning station. The invention relates to a method. The invention relates to a control device. The invention relates to a textile machine. The invention relates to a computer program product.

[0002] Drafting devices are known in the art. They are used particularly in textile machines, and especially in air-jet spinning machines for air spinning. In air spinning, a fiber sliver, also called a drafting sliver, is drawn according to the desired yarn fineness by means of a drafting device, in particular a 4-roll drafting device, and fed to a spinneret. The spinneret is, in particular, a functional component of a spinning station. Within the spinneret, a portion of the fed fibers can be wound around the parallel fiber core by means of a rotary flow. This creates, in particular, the air-jet yarn-specific yarn structure of a yarn core consisting of parallel fibers and wrapping fibers lying at a specific angle to the yarn core, which contribute to the yarn's strength.

[0003] If individual rollers of the drafting unit are idle for an extended period, the fiber sliver can become compressed over time. Similarly, frequent shutdowns of the textile machine and / or the drafting unit can make the fiber sliver a potential source of defects in the air-jet spinning process. In the event of a thread break, thread cut, or fiber sliver break, re-spinning may be necessary to resume spinning. However, compression of the fiber sliver can hinder re-spinning and lead to a weak point in the resulting yarn.

[0004] In the prior art, spinning stations are known that can be used for both spinning and joining yarn. In this process, a yarn end, for example after a yarn break, is prepared for joining so that fibers can be reattached to the yarn to allow it to be spun further. This makes it possible to continue a spinning process, for example after a yarn break has occurred. In air-jet spinning machines, according to one embodiment, joining is based in particular on bringing a broken yarn end together with newly arriving fibers from the fiber sliver in the vortex chamber of the air-jet spinning nozzle. The timing of the yarn end return and the speeds and durations of the drafting device are particularly important for joining a yarn. Incorrect timing during joining can lead to inconsistencies in the yarn, which can negatively affect the yarn quality.

[0005] The purpose of the invention is therefore to improve a spinning process, in particular a spinning process, to make the resulting thread more uniform and thus to reduce resources for a spinning process.

[0006] The problem is solved by a drawing device with the features of claim 1. The problem is solved by a spinning unit with the features of claim 9. Furthermore, the problem is solved by a method with the features of claim 12. The problem is solved by a control device with the features of claim 13. The problem is further solved by a textile machine with the features of claim 14. The problem is solved by a computer program product with the features of claim 15.

[0007] Advantageous embodiments of the invention are the subject of the dependent claims.

[0008] According to one aspect, the problem is solved by a stretching device with the features of claim 1.

[0009] This can be a drafting device for a textile machine. The textile machine can be, in particular, an air-jet spinning machine. The drafting device can have several pairs of rollers that can be driven independently of each other. The roller pairs can be designed and arranged to guide a fiber ribbon between an upper and a lower roller of each pair during operation, in order to stretch the fiber ribbon. The drafting device can be designed and configured to carry out a spinning process after the fiber ribbon has been cut within the drafting device. The drafting device can be designed and configured to selectively add at least two pairs of rollers via their drives during the spinning process. This allows the roller pairs to be controlled in a specific manner and operated in different modes.Different operating modes can be distinguished by at least one parameter, as described elsewhere. In particular, the rollers can have different speeds and / or different accelerations. This makes it possible, for example, not to accelerate linearly from a complete stop (standstill) to an operating state during a spinning process. This also eliminates the need to warm up the rollers from a standstill. Instead, the rollers can be kept warm. This improves spinning, especially the initial spinning, and results in a more uniform yarn, thereby reducing the resources required for the spinning process.

[0010] A drafting device can also include a drafting unit and / or be designated as such. Such a drafting unit can, in particular, comprise a number of roller pairs. These can, in particular, each have at least one active roller, which can be designated as the active roller or the drive roller. The drive roller can preferably be a single driven roller coupled to a single drive for powering the roller. If only one roller of a roller pair is active, the other roller can follow the first, active roller and can be driven by it. The inactive roller is, in particular, a passive roller. A contact pressure can be formed between the two rollers to enable the power transmission between the drive roller, as the active roller, and the following roller, as the passive roller.

[0011] A fiber sliver (also called a fiber web) is a band of longitudinally parallel individual fibers held together by static friction. However, the fibers are not yet wound together to form a thread, as described elsewhere. Within a spinneret, a portion of the supplied fibers from the fiber sliver can be wound around a fiber core formed from parallel fibers, which forms the yarn core, by means of a rotary flow. This creates, in particular, the yarn structure specific to air-jet yarns: a yarn core formed from parallel fibers and, at a specific angle, wrapping fibers around the yarn core, which contribute to the yarn's strength. The spinneret can be part of a spinning station (an active functional device), as described elsewhere. Furthermore, the spinneret can be part of a spinning chamber.The spinneret can be called a spinning chamber.

[0012] A joining process can be a method and / or a process step in which a fiber ribbon end is tied to a yarn end to enable the spinning process to continue. Joining is based, in particular, on bringing together a dissipated yarn end in the spinning chamber / spout with newly arriving fibers from the supplied fiber ribbon end. The timing of the returns, especially of the dissipated yarn end, and the speeds and / or running times of the drafting device, especially for feeding fibers in a quantity advantageous for spinning, particularly joining, can be carried out as described below.

[0013] In a spinning machine, particularly an air-jet spinning machine, the spinning process is based on bringing together a prepared yarn end, especially in a vortex chamber of the spinneret, which forms an air-jet spinneret, with newly arriving fibers of the fiber sliver. A prepared yarn end is understood to be one that has been cut and subsequently unwound to bring the fiber ends of the yarn end from a partially twisted to an almost completely, and preferably completely, longitudinally parallel arrangement. An almost completely longitudinally parallel arrangement is one in which, during the unwound process for longitudinally parallelizing the fiber ends, not all fiber ends were longitudinally parallelized, but rather a small proportion of the fiber ends, due to tolerances, did not undergo longitudinal parallelization.

[0014] For the spinning process, the timing of the yarn end return and the speeds and / or running times of the drawing device, among other things for feeding the fiber tape end, are particularly important. According to one embodiment, a spinning process can comprise at least one of the following steps: InIn one step, in particular, an upper thread (thread on the surface of the thread-carrying take-up spool) can be caught from a take-up spool in a known manner by a rotaryally and / or translationally movable thread end-catching device, in particular a pivotable suction nozzle that can be pressurized with negative pressure, and transferred to a thread end preparation. During this process, a thread take-up unit can be opened to introduce the thread into it. The thread take-up unit comprises, in particular, a pair of rollers with an upper and a lower roller, at least one of which is an active roller and the other a passive roller, as described above. The active roller can be driven by a separate drive. In one step, the thread can be inserted into the thread take-up unit (also referred to as the take-up unit) from the thread end-catching device during its movement to transfer the thread end to the thread end preparation unit, particularly via deflection contours.The take-up device can be specifically designed to receive the thread. This receiving can occur, in particular, by the thread being inserted into the take-up device along with a thread segment during its movement, and subsequently clamped by the take-up device, especially after the thread end has been transferred from the thread end-catching device to the thread end preparation unit. Specifically, after being moved by the thread end-catching device, the thread, with a thread segment, rests against a scissor and / or is positioned with a thread segment or the thread end in front of a receiving opening of a dissolving tube in the thread preparation unit. The thread take-up device then clamps the thread. In a subsequent step, the scissors, in particular, cut the thread to create a cut thread end in preparation for a subsequent step to dissolve the thread end.According to an alternative preferred embodiment, the unraveling of the thread end can be carried out without a prior step of cutting the thread.

[0015] The process of catching the yarn end and guiding it in a direction opposite to the yarn's direction of travel during the spinning process is called retraction or yarn retraction. Retraction can occur in one step or in several partial steps, in which case it is referred to as a first, second, ..., xth retraction.

[0016] InIn one step, the (cut) thread end can be drawn into the dissolving tube and dissolved by introducing a stream of compressed air. In another step, a first return of the thread can be achieved by reversing the take-up clamping the thread. This first return of the thread end to the outlet of a thread take-up channel of the air-jet spinning nozzle can be further supported by introducing an air stream accompanying the thread end into a thread guide channel leading the dissolved thread end. This thread guide channel can be part of the thread end preparation and, in particular, can encompass or form the dissolving tube and preferably extend further to the outlet of the thread take-up channel of the air-jet spinning nozzle. Thus, in a single step of the first return, the thread end can be guided through the thread guide channel to the outlet of the thread take-up channel of the air-jet spinning nozzle.

[0017] InIn one step, particularly after the first return, a thread loop can be placed in a pneumatic thread storage unit. This unit is arranged in the thread direction between the air spinning nozzle and the take-up spool or the take-up spool holder for rotatable support of the take-up spool, specifically between the take-up unit and the take-up spool or the take-up spool holder. The thread loop can serve as compensation because the start-up points and accelerations of at least one of the drive shafts for contacting the take-up spool, a take-up spool, a drafting device, and / or a take-up unit may differ.In particular, during the steps described above, an output roller of the drawing device, especially the output lower roller, rotates to comb out the fiber strip clamped between the output lower and upper rollers and to keep the drive of the output roller, especially the output lower roller, and / or the rubber covering of the output rollers warm.

[0018] InIn particular, one step is followed by a second return of the yarn. This takes place, in particular, as far as a vortex chamber (also called a spinning chamber), so that the loosened yarn end can be caught by the airflow. For this purpose, the airflow can be introduced into the vortex chamber of the air-jet spinning nozzle via the spinnerets terminating in the vortex chamber. This generates a suction flow in the yarn take-up channel of the air-jet spinning nozzle, thereby drawing the yarn end into the yarn take-up channel and transporting it to the vortex chamber of the air-jet spinning nozzle. There, the yarn end is positioned between a fiber belt guide element and a spinning cone (also called a yarn forming element) of the spinneret in such a way that it is caught by the vortex airflow.The air-jet spinning nozzle is typically constructed with a two-part housing, one housing part containing the fiber ribbon inlet and the other housing part containing the yarn forming element with the yarn take-off channel. The two housing parts are designed to be movable relative to each other and, when coupled, form the vortex chamber located between the fiber ribbon inlet and the yarn forming element.

[0019] In In one step, the rotating output roller, in particular the output lower roller, is stopped. The stretching device can be started depending on input parameters; this process is called ramp-up.

[0020] The input parameters for the ramp-up, which in particular define a ramp-up profile, can include, in particular, a lead time, a spinning speed, a speed profile, a speed for a first stage, a duration of operation of a first stage, and / or a total ramp-up time of the drafting device or the at least three pairs of rollers arranged therein, consisting of an inlet roller pair, an intermediate roller pair, and an outlet roller pair. Furthermore, a belt roller pair can be provided, which is arranged between the intermediate roller pair and the outlet roller pair. The belt roller pair can, in particular, preferably follow the ramp-up profile of the outlet roller pair during the ramp-up process.

[0021] A speed profile constituting the ramp-up profile can, in particular, have at least one of four sub-parameters. This can be selected from a speed for a first stage, a duration of operation of a first stage, a total ramp-up time of the drawing device, and a yarn take-up acceleration, which in particular determines the total ramp-up time of the yarn take-up.

[0022] Particularly during the dwell time of the yarn take-up, the yarn end can be held in the spinning chamber, which makes it possible to set the preparation of the drawing device in a defined manner.

[0023] In one step, the yarn take-up unit, in particular, ramps up after its dwell time has elapsed, according to a predetermined and / or input acceleration. "Ramping" here refers to the driven operation of the yarn take-up unit. During this time, the drafting unit can also ramp up. After being connected to the fiber belt, the yarn is drawn from the spinning chamber by the yarn take-up unit for continuous spinning, with the spinning process being completed, in particular, after the ramp-up time has elapsed.

[0024] According to a preferred aspect, it may be provided that at least two pairs of rollers are selected for a defined activation from the list of the following pairs of rollers: an input roller pair, an intermediate roller pair and / or a belt roller pair.

[0025] The remaining roller pairs of the drawing unit (input roller pair, intermediate roller pair(s), and / or belt roller pair) can preferably be engaged in a defined manner to initiate a defined drawing-in and drawing of the fiber strip. In this context, "remaining roller pairs" can refer to any of the aforementioned roller pair types. The engagement can occur, in particular, after a first return step. Furthermore, the engagement can occur, in particular, after the formation of a yarn loop. Alternatively or additionally, the engagement can occur during or after a combing step of the fiber strip. Alternatively or additionally, the engagement can occur during or after a warming step of a drive for the output roller pair, in particular a drive for the output lower roller, and / or the rubber covering of at least one of the output rollers.

[0026] Alternatively or additionally, at least one of the aforementioned pairs of rollers, in particular an output roller pair, and further, in particular, an output lower roller, can be engaged in a defined manner by the ramping up of a yarn take-up. In particular, the defined engagement of at least one of the pairs of rollers, as also described elsewhere, can be carried out in such a way that a fiber ribbon is fed to a spinning station in a coordinated manner while a yarn end is being unwound and / or while it is part of a first and / or a second return and / or an xth return. In this context, at least the ramp-up profile of one pair of rollers can have a so-called spinner ramp with at least two support points, as described elsewhere. Reference is made to the referenced explanations in this regard, and repetition is omitted for the sake of readability and conciseness.

[0027] A drawing device can, in particular, have a belt that rotates around a belt roller of a belt roller pair, especially a belt lower roller. One of the belt rollers, the belt lower roller or the belt upper roller, can be driven by a belt roller drive. The belt roller pair is, in particular, arranged between the intermediate roller pair and the output roller pair of the drawing device. Different adjustable peripheral speeds of roller pairs arranged directly one after the other in the fiber strip transport direction enable a defined drawing of the fiber strip between these two roller pairs.

[0028] In a preferred embodiment, it can be provided that, while the output roller pair rotates for combing out the fiber sliver and / or keeping it warm, particularly during the steps described elsewhere from capturing an upper thread end to a first return, not only is the output roller drive kept in operation to drive the output rollers, but the belt roller drive can also be engaged to drive the belt rollers, with the belt roller being actively driven, while the drives of the other roller pairs, such as the input roller pair drive and / or the intermediate roller pair drive, are in particular stationary. This allows the fiber sliver to be separated between the intermediate roller pair and the belt roller pair, whereby the separated fiber sliver piece can be discharged from the drafting device by the rotating belt and output rollers.

[0029] In particular, after combing out a fiber sliver, the output roller drive and / or belt roller drive stop, and the spinning unit returns to its operating position, which corresponds to the normal spinning position (spinning pressure is applied, the air spinneret is closed). The next process steps, as described elsewhere, can then proceed. The final thread return can follow, and the active rollers of the drafting unit can be accelerated using the parameters described. Specifically, the parameters can be adjusted to transport the fiber sliver, particularly into the vortex chamber in front of the yarn forming element of the air spinneret.

[0030] InIn other words, this means that significantly longer running times can be entered than if the fiber strip were already present between the belt roller pair and the output roller pair. This allows the initial start-up of the belt roller motor, particularly the belt roller drive, and the output roller drive to occur without the fiber strip in this area. This prevents the breakaway torque from having an effect in this zone. Consequently, the breakaway torque cannot affect the fiber strip and therefore cannot impact the yarn quality. Alternatively or additionally, spinning can be initiated with an already running drafting unit.

[0031] The preferred aspects and embodiments described here and elsewhere allow for the reduction or complete prevention of minimal differences in the starting times of the individual drafting roller drives, as well as slight deviations from target / actual parameters, such as target / actual speed(s), particularly of the output roller drive and, furthermore, the output underroll drive. Furthermore, the factors identified elsewhere as disadvantages can be improved, for example, by avoiding increased contact forces on the drafting rollers. This reduces or completely eliminates distortion during spinning. It also reduces or prevents the hesitant acceleration of the belt roller pair, which is particularly noticeable in high-speed camera recordings.

[0032] Here and elsewhere, this refers in particular to a reduction or to reducing a selected event or risk, based on a probability of occurrence, frequency of occurrence, event or risk.

[0033] The preferred aspects and embodiments described here and elsewhere enable the circumvention of different breakaway torques, particularly of the belt roller pair, and / or the circumvention of an (initial) target / actual speed deviation, particularly of the output roller drive, for different drafting unit settings by means of software-based sequence adjustment. The software-based sequence adjustment can be implemented, in particular, in a control unit as described elsewhere, and / or by means of a computer program product, as described elsewhere, which can, in particular, be executed on a control unit.

[0034] According to a preferred aspect, the air-jet spinning nozzle can be designed and configured to assume at least one cleaning position. The cleaning position is a position of the air-jet spinning nozzle that differs from the operating position in which normal spinning operation of the air-jet spinning nozzle takes place to produce the air-spun yarn. To assume the cleaning position, the two housing parts of the air-jet spinning nozzle move away from each other in a known manner, as described elsewhere, to assume an open housing position. This allows fragments of a fiber spool to be discharged from the drafting device. This can improve the spinning process and save resources.

[0035] Before or at the latest when at least one of the remaining roller pairs starts (excluding the exit roller pair), particularly when the belt roller pair starts, the air spinning nozzle can be moved to the cleaning position. Subsequently, the operating roller pairs can be stopped, and the air spinning nozzle can return to its operating position to continue the spinning process, as described elsewhere, by a defined start of the drafting unit. In this case, the described stopping of the exit roller pair can be omitted, as the drafting unit may already be stopped.

[0036] According to a preferred aspect, the drawing device can be designed and configured to separate the fiber tape by a coordinated activation of at least one pair of rollers, in particular at least two pairs of rollers. This allows for active separation of the fiber tape in order to dispose of an already damaged and / or weakened end of the tape.

[0037] In particular, separation can be achieved in the area between a middle roller pair and a belt roller pair, as described elsewhere. This can be accomplished, in particular, by activating the belt roller pair, especially by driving the belt lower roller, before the other roller pairs of the drafting device are engaged. This allows the belt roller pair to exert tension on the fiber strip, while the fiber strip is clamped by at least one other roller pair, especially arranged opposite to the tension direction of the belt roller pair. This allows the fiber strip to be cut at a weak point.

[0038] According to a preferred aspect, the drawing device can be designed and configured to coordinate the separation of the fiber ribbon by means of a coordinated activation of at least one pair of rollers, in particular at least two pairs of rollers, with the transfer of the air spinneret into the cleaning position. This makes it possible to spin in a cleaned air spinneret.

[0039] The belt roller pair can be activated before the other roller pairs of the drafting unit are engaged to separate the fiber strip in the area between the center roller pair and the belt roller pair, as described elsewhere. Specifically, activating the belt roller pair moves the air spinneret into the cleaning position for removing the separated fiber strip section. Cleaning can then be carried out as described elsewhere.

[0040] The method for separating the fiber strip between the output roller pair and the belt roller pair can also be used for partial automation of the fiber strip feeding.

[0041] The preferred aspects and embodiments described here can involve a semi-automated fiber tape feed. This so-called semi-automated fiber tape feed involves, in particular, the disposal of an "old" fiber tape end remaining in a drawing device after a spinning interruption and the feeding of a newly drawn fiber tape end to the air-jet spinning nozzle for spinning. Simultaneously, or in a time-coordinated manner, the air-jet spinning nozzle is cleaned, as described elsewhere. A semi-automated fiber tape feed is possible under the conditions described here. However, not every possible fiber tape feed can be semi-automated. An example of a fiber tape feed that cannot be (partially) automated is the insertion (in the sense of re-inserting) of a new fiber tape.The machine operator can manually initiate the fiber tape feed by pressing a button. Partial automation can be implemented in terms of software and process flow, particularly as described elsewhere. The various pairs of rollers can also be activated, particularly in a coordinated manner, as described elsewhere, especially individually or in any combination. The preferred aspects, features, and functions of a partially automated fiber tape feed can also be implemented separately from the other preferred aspects.

[0042] In particular, the sequence of a warm-up of the output roller drive, a stop, and then a restart from zero can facilitate spinning. Alternatively or additionally, the other pairs of rollers can rotate at least partially. During this process, the rubber rollers (solid rubber rollers and / or rollers with a rubber coating) can be kept warm. Meanwhile, the spinning station may be shut down due to quality defects, especially in a thread and / or a fiber sliver or similar.

[0043] According to a preferred aspect, the drafting device can be designed and configured to specifically adjust at least one process parameter for driving at least one of the roller pairs over a defined period. This allows the various advantages described elsewhere to be implemented. Alternatively, a process parameter for driving at least two of the roller pairs can be specifically adjusted over a defined period.

[0044] InIn preferred embodiments, a process parameter can be implemented as an S-shaped curve. In this configuration, the drive acceleration is not linear across the entire acceleration range. Instead, the drives that power the roller pairs are accelerated using an S-curve profile. The shape of the curve can be adjustable within a minimum and / or maximum range. This avoids extreme accelerations that could negatively impact the rollers and drives, and which could also negatively affect contact between the rollers and the fiber strip. The S-shaped curve can be implemented for the yarn take-up, which removes a spun yarn from a spinning station and feeds it, in particular, to a bobbin case or empty bobbin for winding the yarn, especially via a changing device in a textile machine that produces take-up bobbins.Alternatively or additionally, the S-shaped groove can also be implemented for the rollers of the drafting unit. This can serve to introduce the fibers into the air-jet nozzle at a more moderate rate (i.e., defined by mass per unit time) in order to achieve a slow increase in fiber mass. The term "slow" here refers specifically to a coordinated increase in fiber mass, enabling coordination with yarn take-up and, consequently, with the spinning speed. This prevents uneven yarn formation and / or clogging of the air-jet nozzle.

[0045] InIn preferred embodiments, a process parameter can be, in particular, a decoupling. Specifically, this means that the ramp-up profiles of the remaining roll pairs of the drafting device no longer follow the ramp-up profile of the output roll pair. Through decoupling, the operation or ramp-up of the output roll pair, especially the driven output bottom roll, can be coordinated separately from the other roll pairs of the drafting device in terms of timing (relative to each other). In other words, this means that the output roll pair, especially the driven output bottom roll, can already be rotating while the other roll pairs of the drafting device are stationary. Alternatively or additionally, the drives of the other roll pairs can be operated with a different parameter, as described elsewhere. This allows fluctuations in the operation of the output roll pair, especially the output bottom roll, to be mitigated.If the output roller pair, especially the bottom output roller, does not run up smoothly, the fibers cannot be passed on in the same quantity as specified by the roller pairs of the other drafting unit. This could lead to additional distortion or fiber build-up. This can be compensated for by individually controlling the other roller pairs. This makes it possible to form a uniformly shaped fiber sliver. This also ensures a consistent delivery of fibers to the air spinneret. This also allows for the spinning of a continuously formed yarn.

[0046] By individually controlling at least one drive of the roller pairs, the speed of the respective driven roller pairs or their driven lower rollers and / or upper rollers can be specifically adjusted over a defined period of time.

[0047] Another aspect is that the drawing device can be designed and configured to form at least two support points during a spinner ramp in the ramp-up profile. This allows the roller pairs, whose ramp-up is particularly defined by the spinner ramp, to develop adapted accelerations. This also enables an adjustment of the relative process parameters of the roller pairs to each other, thus supporting the spinning process.

[0048] A spinner ramp can be the mathematical profile of a process parameter, for example, in an XY diagram. This allows for the description of a ramp-up from more than one point at which the process parameter changes. Such a point can be described as a support point. This is, in particular, a point in the process parameter space. This makes it possible to implement multiple support points during the spinner ramp of at least one driven roller of the drawing device. A ramp-up with at least one driven roller of the drawing device can, in particular, be provided with three support points in one embodiment.

[0049] The term "support point" refers specifically to the definition of a variable speed that should be reached after a variable time. This change, for example, prevents the spinners from becoming thin after a binding zone. In particular, it results in a more flexible fiber structure during spinning.

[0050] According to a preferred aspect, the drafting device can be designed and configured to maintain a defined temperature of the rollers while a spinning station is inactive. This can be achieved, in particular, by a previously described method of continuing operation of at least one drive of the roller pairs. This allows the drives and / or the rubber coatings of the rollers in question to be kept at a temperature suitable for improved operation of the drafting device. This also reduces or completely eliminates warm-up times.

[0051] From an independent perspective, a spinning station can have at least one spinneret, in particular an air spinneret. The spinning station can have at least one yarn end preparation. The spinning station can have at least one yarn take-off. The spinneret and the yarn end preparation can be arranged and configured to initiate spinning. The yarn take-off can be arranged and configured to remove a yarn from the spinneret after a spinning process. At least one pair of rollers of a drafting device, in particular the drafting device as described elsewhere, can be engaged in a coordinated manner via the drive of the roller pair. This makes it possible to prevent clogging of the spinneret, since, for example, the supply of fibers can be controlled, in particular coordinated with the removal of a yarn being formed.Alternatively or additionally, a uniform thread can be formed.

[0052] According to a preferred aspect, the yarn take-up is designed and configured, in particular to be coordinated with the at least one pair of rollers. This at least one pair of rollers can have a ramp profile with a spinner ramp with at least two support points. This makes it possible to prevent clogging of the spinneret, since, for example, the supply of fibers can be controlled, especially coordinated with the removal of a yarn being formed. Alternatively or additionally, a uniform yarn can be formed.

[0053] As described elsewhere, the term "support point" refers specifically to the definition of a variable speed that can be reached after a variable time. This modification, in particular, prevents, for example, the spinners from becoming thin after a binding zone. This results in a more flexible fiber structure during spinning.

[0054] The spinner ramp can be a ramp leading up to a driven output roll of the output roll pair. The driven output roll can preferably be the lower output roll. The output roll pair serves, in particular, to transfer the fiber ribbon from a drafting unit, especially as described elsewhere, into a spinneret of a spinning station in order to spin a yarn. Other structures and devices, such as a pre-compressor, can also be involved in this transfer. In other words, the driven output roll, especially the lower output roll, can undergo several accelerations and reach several speeds in different times during the ramp-up to an operating speed. The corresponding points can be represented in a velocity-time graph. The ramp-up can begin from a complete stop.Alternatively, or at other times, the startup can also be performed from a keep-warm mode, i.e., from a kind of base speed.

[0055] In embodiments of the drawing device's rollers, and also in combination with the aspects of the spinning unit described here, a spinner ramp between at least two adjacent support points can have an S-shaped chamfer, as described elsewhere. This allows breakaway torques to be reduced and / or high accelerations to be avoided, which can negatively affect yarn quality or sliver quality. This makes it possible to improve the spinning process, as described elsewhere.

[0056] Two data points are adjacent, particularly in a diagram such as a velocity-over-time graph, meaning they follow each other directly in the graph's progression. "Directly" here means that there is no data point in between.

[0057] According to a preferred design, the spinneret can be designed and configured to assume at least one operating position and a cleaning position distinct from it, as described elsewhere. Alternatively or additionally, the yarn end preparation can be designed and configured to at least loosen one yarn end by means of a compressed air supply, as described elsewhere. This can improve the spinning process, as already described elsewhere.

[0058] The spinning process relies in particular on bringing together a prepared yarn end in a vortex chamber of the air-jet spinning nozzle with newly arriving fibers of the fiber ribbon, as described elsewhere. The timing of the yarn end return and the speeds and / or running times of the drawing device are of particular importance.

[0059] According to a preferred embodiment, a spinning process may comprise at least one of the following steps: InIn one step, in particular, an upper thread (thread on the surface of the thread-carrying take-up spool) can be caught from a take-up spool by a rotaryally and / or translationally movable thread end-catching device, in particular a pivotable suction nozzle that can be pressurized with negative pressure, and transferred to a thread end preparation. During this process, a thread take-up unit can be opened to introduce the thread into the unit. The thread take-up unit comprises, in particular, a pair of rollers with an upper and a lower roller, at least one of which is an active roller and the other a passive roller, as described above. The active roller can be driven by a separate drive. InIn one step, particularly via deflection contours, the thread can be inserted into the thread take-up device (also called the take-up unit) from the thread end catching device during its movement to transfer the carried thread end to the thread end preparation. A take-up unit can be specifically designed to receive the thread. This take-up can occur, in particular, by the thread being inserted into the take-up unit with a thread segment from the thread end catching device during its movement and subsequently clamped by it, especially after the thread end has been transferred from the thread end catching device to the thread end preparation. Specifically, after being moved by the thread end catching device, the thread, with a thread segment, rests against a scissor and / or is positioned with a thread segment or the thread end in front of a receiving opening of a dissolving tube of the thread end preparation. In particular, the thread take-up unit then clamps the thread.In a subsequent step, the shears, in particular, cut the thread to create a cut thread end in preparation for a subsequent step of unraveling the thread end. According to an alternatively preferred embodiment, the unraveling of the thread end can be carried out without a prior step of cutting the thread. During the cutting step, the thread can be cut to a defined length. This allows any defects in a spinning process to be eliminated.

[0060] The process of catching the yarn end and guiding it in a direction opposite to the yarn's direction of travel during the spinning process is called retraction or yarn retraction. Retraction can occur in one step or in several partial steps, in which case it is referred to as a first, second, ..., xth retraction.

[0061] InIn one step, the (cut) thread end can be drawn into the dissolving tube by introducing a compressed air stream and dissolved within the tube. In another step, a first return of the thread can be achieved, in particular by reversing the take-up clamping the thread. This first return of the thread end to the outlet of a thread take-up channel of the air-jet spinning nozzle can be further supported by introducing an air stream accompanying the thread end into a thread guide channel leading the dissolved thread end. The thread guide channel can be part of the thread end preparation and, in particular, can encompass or form the dissolving tube, and preferably extends to the outlet of the thread take-up channel of the air-jet spinning nozzle. Thus, in a single step of the first return, the thread end can be guided through the thread guide channel to the outlet of the thread take-up channel of the air-jet spinning nozzle.

[0062] InIn one step, particularly after the first return, a thread loop can be placed in a pneumatic thread storage unit. This unit is arranged in the thread direction between the air spinning nozzle and the take-up spool or the take-up spool holder for rotatable support of the take-up spool, and especially between the take-up unit and the take-up spool or the take-up spool holder. The thread loop can serve as compensation because the start-up points and accelerations of at least one of the drive shafts for contacting the take-up spool, a take-up spool, a drafting device, and / or a take-up unit can differ.Alternatively or additionally, particularly during the steps described above, an output roller of the drawing device, in particular the output lower roller, rotates to comb out the fiber strip clamped between the output lower and upper rollers and to keep the drive of the output roller, in particular the output lower roller, and / or the rubber covering of the output roller warm.

[0063] InIn particular, one step is followed by a second return of the yarn. This takes place, in particular, as far as a vortex chamber (also called a spinning chamber), so that the loosened yarn end can be caught by the airflow. For this purpose, the airflow can be introduced into the vortex chamber of the air-jet spinning nozzle via the spinnerets terminating in the vortex chamber. This generates a suction flow in the yarn take-up channel of the air-jet spinning nozzle, thereby drawing the yarn end into the yarn take-up channel and transporting it to the vortex chamber of the air-jet spinning nozzle. There, the yarn end is positioned between a fiber belt guide element and a spinning cone (also called a yarn forming element) of the spinneret in such a way that it is caught by the vortex airflow.The air-jet spinning nozzle is typically constructed with a two-part housing, one housing part containing the fiber ribbon inlet and the other housing part containing the yarn forming element with the yarn take-off channel. The two housing parts are designed to be movable relative to each other and, when coupled, form the vortex chamber located between the fiber ribbon inlet and the yarn forming element.

[0064] In In one step, the rotating output roller, in particular the output lower roller, is stopped. The stretching device can be started depending on input parameters; this process is called ramp-up.

[0065] The input parameters for the ramp-up, which in particular define a ramp-up profile, can include, in particular, a lead time, a spinning speed, a speed profile, a speed for a first stage, a duration of operation of a first stage, and / or a total ramp-up time of the drafting device or the at least three pairs of rollers arranged therein, consisting of an inlet roller pair, an intermediate roller pair, and an outlet roller pair. Furthermore, a belt roller pair can be provided, which is arranged between the intermediate roller pair and the outlet roller pair. The belt roller pair can, in particular, preferably follow the ramp-up profile of the outlet roller pair during the ramp-up process.

[0066] A speed profile constituting the ramp-up profile can, in particular, have at least one of four sub-parameters. This can be selected from a speed for a first stage, a duration of operation of a first stage, a total ramp-up time of the drawing device, and a yarn take-up acceleration, which in particular determines the total ramp-up time of the yarn take-up.

[0067] Particularly during the dwell time of the yarn take-up, the yarn end can be held in the spinning chamber, which makes it possible to set the preparation of the drawing device in a defined manner.

[0068] InIn one step, the yarn take-up unit, in particular, starts up after its dwell time has elapsed, according to a predetermined and / or input acceleration. "Starting up" here refers to the driven operation of the yarn take-up unit. During this time, the drafting unit can also start up. The yarn is thus drawn from the spinning chamber, particularly by means of the driven yarn take-up unit, whereby the spinning process is completed, especially after the start-up time has elapsed.

[0069] Additionally or alternatively, a spinneret, in particular an air spinneret, can be designed and configured to assume at least one cleaning position, especially as described elsewhere. This allows fragments of a fiber spool to be discharged from the drawing device. This improves the spinning process and saves resources.

[0070] Before or at the latest when the remaining pairs of rollers start, the air spinneret can be moved to a cleaning position to remove the "old" fiber sliver. Afterwards, the roller pairs can be stopped, and the air spinneret can return to its operating position to continue the spinning process, as described elsewhere, by starting the drafting unit in a controlled manner. In this case, the previously described stopping of the output roller pair can be omitted, as the drafting unit may already be stopped.

[0071] The spinneret of a spinning station can be designed and equipped to remove fiber residues in a cleaning position, which may arise during the warm-up of the various pairs of rollers and / or drives or during the keeping of the pairs of rollers and / or drives warm, in order to prevent clogging of the spinneret in particular.

[0072] The aspects and / or embodiments of the spinning unit described here, in combination with the aspects and / or embodiments of the drafting device described elsewhere, can optimize the operation of a textile machine by preparing the fiber ribbon for entry into a spinneret, as described elsewhere. Alternatively or additionally, the return of a yarn end can be improved and coordinated, particularly with the feeding of a fiber ribbon. The corresponding coordination of the timing of the roller pairs, or their speeds and / or accelerations, can be adapted to prevent excessive stretching or pulling of the fiber ribbon. A damaged fiber ribbon can also be replaced, thereby optimizing the entry of fibers into a spinneret of a spinning unit. This allows, in particular, the uniform formation of the yarn to be produced in a spinneret.The combination, as described, also allows the timing of drawing off a spun thread to be coordinated with the incoming fibers. This allows the thread to be uniformly shaped, which can have a positive effect on textiles into which the thread is incorporated.

[0073] The spinning station can be designed independently, i.e., without being combined with the drawing device described here. In this case, the yarn take-up of a yarn can be adjusted to the activity of the spinneret of a corresponding spinning station.

[0074] A method can be designed according to an independent aspect. The method can include at least one step of separating a fiber ribbon by the coordinated addition of at least one pair of rollers, in particular at least two pairs of rollers, a drawing device, in particular a drawing device as described elsewhere.

[0075] The method may alternatively or additionally include at least the step of spinning by coordinated addition of at least two pairs of rollers of the drawing device, in particular the drawing device as described elsewhere.

[0076] The process may alternatively or additionally include at least one step of starting the spinning process by the coordinated addition of at least one yarn take-up from a spinning station. The spinning station may, in particular, be a spinning station as described elsewhere. The starting the spinning step may, in particular, be designed to return a yarn end to a spinneret.

[0077] The process may alternatively or additionally include at least one step of spinning a thread. This step may be carried out, in particular, after the initial spinning has taken place. The spinning step may, in particular, include the coordinated activation of the thread take-up and at least one pair of rollers of the drawing device, especially a drawing device as described elsewhere.

[0078] The process can be described by the features, effects, and advantages of the textile machine, the features, effects, and advantages of the drafting device, as well as the features, effects, and advantages of the control device. The textile machine, the drafting device, and the process can all be described by the features, effects, and advantages of the control device.

[0079] From an independent perspective, a control device can be designed and configured to carry out a process as described elsewhere. The control device can be described by the features, effects, and advantages of the textile machine, by the features, effects, and advantages of the drafting device, and by the features, effects, and advantages as described in relation to the processes. The textile machine, the drafting device, and the process can also be described by the features, effects, and advantages as described in relation to the other categories. Similarly, the control device can be described by the features, effects, and advantages of the spinning station as described elsewhere. The features, effects, and advantages of the control device can describe the spinning station as described elsewhere.

[0080] From an independent perspective, a textile machine may have at least one drawing device as described elsewhere. Alternatively or additionally, the textile machine may have a spinning unit as described elsewhere. Alternatively or additionally, it may have a control device as previously described. Alternatively or additionally, the textile machine may be designed and configured to perform a process as described elsewhere.

[0081] The textile machine can be, in particular, an air-jet spinning machine. The textile machine can be described by the characteristics, effects, and advantages of the drafting device as well as by the processes. The drafting device and the process can be described by the characteristics, effects, and advantages of the textile machine. Similarly, the textile machine can be described by the characteristics, effects, and advantages of the spinning unit, as described elsewhere. The characteristics, effects, and advantages of the textile machine can describe the spinning unit, as described elsewhere.

[0082] From an independent perspective, a computer program product can be designed to execute a process as previously described when executed on a control device, in particular a control device as previously described, on a textile machine, in particular as previously described. This allows the advantages and effects of the devices and processes described above to be realized. The devices and processes can be described by the features, effects, and advantages of the computer program product. Similarly, the computer program product can be described by the features, effects, and advantages of the spinning machine as described elsewhere. The features, effects, and advantages of the computer program product can describe the spinning machine as described elsewhere.

[0083] A computer program product is, in particular, a machine-readable code stored in a memory that can control and monitor a suitably equipped textile machine or provides corresponding instructions in order to control the textile machine, at least partially, when the computer program product is executed on a computing unit of a control device.

[0084] In summary, and in other words, this means that, particularly in cases where semi-automated fiber spool feeding is possible—for example, during shutdowns at the spinning station due to quality defects and yarn breaks, or when a spinning station has been idle for an extended period—the run times and parameters can be variably adjusted via software. Fiber spool feeding is performed specifically before restarting the spinning station after a shutdown (quality defects, yarn breaks) or a long period of inactivity. For this purpose, the rollers or roller pairs of the drafting unit are operated at an adjustable speed and run time according to their warpage (variable, as it depends on the yarn number being produced).In this process, a new section of fiber sliver is stretched and fed towards the spinneret, while the old fiber sliver, including any irregularities, is removed. During this time, the spinning station enters a cleaning position. This allows for the more efficient removal of excess fibers generated during sliver feeding. As a result, fiber blockages, particularly in the spinning station, can be prevented. The cleaning position is variable and includes at least two different variations.

[0085] In In one variant, the spinning pressure can be switched off and, in particular, the spinneret does not open. The fibers can then be drawn into a suction system, specifically either an upper and / or a lower suction system.

[0086] InIn a second variant, the spinning pressure can be switched on and the spinneret can be opened. The fibers are then drawn in, particularly through the fiber inlet, and extracted below the spinneret.

[0087] Alternatively or additionally, the fiber sliver feed can be partially automated by adding, for example, a belt drive during the warm-up of the output roll pair, particularly the output bottom roll. This allows the fiber sliver to be separated in a so-called main warpage zone. For this purpose, the fiber sliver feed is not carried out before the start of the spinning process, but rather after a warm-up. The fiber sliver feed can take place, in particular, between the combing and / or warming of an output roll drive and / or a rubber coating of at least one roll and a second return, as described elsewhere. The cleaning position is achieved, in particular, during a step of the second return. The spinneret is briefly opened, especially at the start of the yarn return. The spinning pressure is already applied, particularly for this part of the spinning process.This results in the second variant of the cleaning position, particularly at a later time.

[0088] The fiber tape feed rate depends in particular on the setting of a drawing device, i.e., on the set distances between the roller pairs, whereby the running time can be variably adjusted. The distance between the roller pairs can be variably adjustable and thus facilitate the drawing of the fiber tape.

[0089] Alternatively or additionally, the control unit or the machine-readable code executed on it can be used to coordinate the activity of a spinning station, in particular a spinneret and / or a yarn end preparation, in particular a compressed air supply for dissolving a yarn end and / or a dissolving tube for dissolving a yarn, especially together with at least one driven roller, in particular a lower roller of a drafting unit. For at least one driven roller, in particular at least one lower roller, several support points can be formed during a single ramp-up, as described elsewhere. The driven roller can be an output roller, in particular an output lower roller.

[0090] Exemplary embodiments of the invention are described in more detail below with reference to the figures, which show schematically and by way of example: Fig. 1 a schematic representation of a spinning process; Fig. 2A a view of a fiber strip layer in an embodiment of a drawing device after a shutdown; Fig. 2A view of the start of the warm-up of the belt underroller and / or exit underroller in an embodiment of a drawing device, wherein the fiber strip is separated; Fig. 2C a view of a fiber strip layer after the end of the warm-up of the belt underroller / exit underroller in an embodiment of a drawing device; Fig. 3A a view of a first cleaning position in an embodiment of a drawing device; Fig. 3A view of a second cleaning position in an embodiment of a drawing device; Fig. 4 a schematic representation of a spinner ramp of an exit underroller and a yarn take-up; Fig. 5 a schematic representation of a spinner ramp with a support point; Fig.Fig. 6 a schematic representation of a spinner ramp with S-shaped chamfer; Fig. 7 a schematic representation of a spinner ramp with one support point; and Fig. 8 a schematic representation of a spinner ramp with three support points.

[0091] The same reference symbols are used for elements and structures that have the same effect and / or are of the same type.

[0092] Fig. 1 Figure 1 shows a schematic representation of a spinning process 100 on a textile machine, in particular an air-jet spinning machine. In step 1, the end of a thread laid on a take-up spool (also called the top thread) can be captured. In this step 1, the thread end can be captured by a movable thread end-capture device such as a suction nozzle. Simultaneously, a thread take-up unit formed by a pair of rollers can be opened to allow the thread to be introduced into the take-up unit.

[0093] InIn step 2 of the process of positioning a thread segment, the thread can be guided into the thread take-up device, also known as a take-up unit, via deflection contours during the movement of the thread end catch device. The take-up unit can be specifically designed to receive the thread. In particular, the thread is positioned, especially at the end of the thread end catch device's movement, within the cutting area of ​​scissors and / or in front of the opening of a dissolving tube in a thread end preparation unit. The thread take-up unit clamps the thread, particularly after the thread end has been positioned as described above.

[0094] In In step 3, the thread can be cut using scissors. A defined length of thread can be cut off.

[0095] In In step 4 of dissolving the thread end, the thread end can be dissolved by introducing a stream of compressed air into a dissolving tube.

[0096] In In step 5, a first return of the yarn to the outlet of a yarn take-up channel of an air-jet spinning nozzle, this return can be supported by reversing the take-up clamping the yarn and by introducing an airflow accompanying the yarn end into a yarn guide channel leading the released yarn end. The yarn guide channel can be part of the yarn end preparation and, in particular, can include or form the release tube, and preferably extends further to the outlet of the yarn take-up channel of the air-jet spinning nozzle. The spinning pressure can be used for air-accompanied transport within the yarn take-up channel; alternatively or additionally, the yarn can be blown further within the yarn guide channel by supplying compressed air.

[0097] InIn step 6 of laying a yarn loop, particularly after step 5 of the first return, step 6 of laying the yarn loop into a pneumatic yarn storage unit can take place. This storage unit is arranged in the yarn direction between the air spinning nozzle and the take-up spool or the take-up spool holder for rotatable support of the take-up spool, particularly between the take-up unit and the take-up spool or the take-up spool holder. The yarn storage unit can serve as compensation because the start-up points and accelerations of at least one drive shaft, a take-up spool, a drafting device 101, and / or a take-up unit can differ.

[0098] InIn step 7 of a combing and warming process, in particular during the previously described steps 1 to 6, an output roller pair rotates by driving the output lower roller 26 in order to comb out the fiber strip 31 arranged between the output rollers and to keep the output lower roller drive 36 and / or the rubber covering of the output rollers warm.

[0099] In a semi-automated fiber tape feeder, the preceding step 7 can be adapted. In other words, particularly after step 6 or with step 7, the remaining roller pairs of the drawing unit 101 (infeed roller pair, intermediate roller pair(s), and, if present, belt roller pair) are activated in a defined manner to initiate a defined feeding and drawing of the fiber tape. Before or at the latest with the activation of the remaining roller pairs, the air spinneret can be moved into a cleaning position (see the two variants described elsewhere) to remove the "old" fiber tape. In theThe roller pairs can then be stopped, and the air spinning nozzle, in particular, resumes its operating position to continue the spinning process, as described elsewhere, especially by a defined start of the drafting device 101 (see step 9). Here, the stopping of the output underroll drive 36, as described elsewhere, can be omitted, since the roller pairs of the drafting device 101 may already be stopped.

[0100] This can be supplemented by activating the belt roller pair, in particular by driving the belt lower roller, before engaging the other roller pairs of the drafting device 101, in order to achieve separation of the fiber strip 31 in the area between the center roller pair and the belt roller pair. With the engagement of the belt roller pair, the air spinning nozzle is moved into the cleaning position for the removal of the separated fiber strip section.

[0101] Additionally or alternatively, the speeds of the respective driven rollers of the respective roller pairs, in particular the driven lower rollers, can be specifically adjusted over a defined period. The operation of a roller can, in particular, have at least two support points during startup in a spinner ramp or in a ramp of a roller's startup profile. This is described in detail elsewhere.

[0102] In Step 8, a second return, is followed in particular by a second return of the thread. This takes place especially up to a vortex chamber (also referred to as a spinning chamber), so that the end of the thread can be caught by the airflow.

[0103] InIn step 9, when the output roller pair is stopped, the rotation of the output rollers or output roller pair is stopped. The stretching device 101 can then be started depending on input parameters.

[0104] The input parameters for the ramp-up, which define the ramp-up profile, can include, in particular, a lead time, a spinning speed, a speed profile, a speed for a first stage, a duration of operation of a first stage, and / or a total ramp-up time of the drafting device 101. The driven belt bottom roller 24, intermediate bottom roller 22, and / or input bottom roller 20 can follow the output bottom roller 26 during ramp-up.

[0105] A speed profile constituting the ramp-up profile can, in particular, have at least one of four sub-parameters. These can be selected from a speed for a first stage, a duration of operation of a first stage, a total ramp-up time of the drawing device 101, and a yarn take-up acceleration, which in particular determines the total ramp-up time of the yarn take-up.

[0106] During a dwell time of the yarn take-up, the yarn end can be held in the spinning chamber, which makes it possible to set the preparation of the drawing device 101 in a defined manner.

[0107] In In step 10, a dwell time is observed, and in particular the thread take-up runs up according to a predetermined and / or entered acceleration as its dwell time elapses.

[0108] InDuring step 11 of a running cycle of the yarn take-up, the drawing device 101 also starts up, particularly during this time. "Running" here refers to the driven operation of the yarn take-up. After being connected to the fiber belt 31, the yarn is drawn from the spinning chamber by the driven yarn take-up for continuous spinning, with the spinning process being completed, in particular, after the start-up cycles have elapsed.

[0109] Fig. 2AFigure 1 shows a view of a fiber strip layer in an embodiment of a drawing device 101 after the lower rollers 20, 22, 24, 26 of pairs of rollers have been stopped. Each pair of rollers consists of one of the lower rollers 20, 22, 24, 26 and an associated upper roller. In a closed state, the intermediate fiber strip 31 is transported by the lower rollers 20, 22, 24, 26 during rotation of the roller pairs. Specifically, an input lower roller 20 of an input roller pair, a middle lower roller 22 of a middle roller pair, a belt lower roller 24 of a belt roller pair, and an output lower roller 26 of an output roller pair are shown in a row. These components are part of the drawing device 101. The drawing device 101 is attached to a support 12 by a locking device 16.The infeed lower roller 20 is driven rotaryally, in particular by an infeed lower roller drive 30. The intermediate lower roller 22 is driven rotaryally, in particular by a intermediate lower roller drive 32. The belt lower roller 24 is driven rotaryally, in particular by a belt lower roller drive 34. The output lower roller 26 is driven rotaryally, in particular by an output lower roller drive 36. A belt 28 runs around the belt lower roller 26, and can also be guided around a belt bridge 29 to create tension in the belts 28. The relative positions of the lower rollers 20, 22, 24, and 26 can be adjusted by means of an adjusting device 18.The lower part of the drawing device 101 shown here can be connected via an upper roller carrier (not shown), which carries the upper rollers (not shown) of the respective roller pairs, the upper rollers being passive rollers due to the lack of their own drive.

[0110] Fig. 2B shows a view of a start of the warm-up of belt underroller 24 and / or output underroller 26 in an embodiment of the drawing device 101, wherein the fiber strip 31 is separated in a separation area 25.

[0111] Fig. 2C Figure 1 shows a view of a fiber strip layer after the end of the warm-up of the belt bottom roller 24 and / or exit bottom roller 26 in an embodiment of the drawing device 101. The separation area 25 can be located in a region of a compressor which is positioned upstream of the belt bottom roller 24.

[0112] During step 7, as in relation to the Fig. 1As described, the spinning station can be moved into the cleaning position with the cleaning nozzle. This allows excess fibers generated during warm-up to be removed more effectively without causing fiber blockages, particularly in a spinning nozzle 40. The cleaning position is variable and can have two different configurations, as shown in the Figures 3A and 3B shown and described below.

[0113] Fig. 3AFigure 1 shows a view of a first cleaning position in an embodiment of the drawing device 101. A fiber ribbon 31 is guided between an output upper roll 27 and an output lower roll 26 and transported by the rotation of the rolls. The spinning pressure within the spinneret 40 may be switched off, and the spinneret 40, which consists of two housing parts, may be closed, i.e., it may not open. As a result, the fibers of the fiber ribbon 31, or its fragments 14, can enter either the upper suction port 13 or the lower suction port 15, which are arranged and assigned to the output pair formed by the output lower roll 26 and output upper roll 27, respectively, and thus be extracted.

[0114] Fig. 3BFigure 1 shows a view of a second cleaning position in an embodiment of the drawing device 101. The spinning pressure can be switched on, and the spinneret 40 can be opened by a relative movement in the direction of the double arrows of one of the two housing parts, which carries the spinning cone 42 of the spinneret 40, relative to the other housing part, which carries the fiber inlet 21. The fibers of the fiber spool 31 or its fragments 14 are drawn in, in particular, through the fiber inlet 21 and, via a fiber suction 23 communicating with the spinning chamber, in the open position of the spinneret 40, i.e., in a position spaced apart from the fiber inlet 21 (not shown). After step 7, in which the output underroller drive 36 and the belt underroller drive 34 are stopped, the spinning station returns, in particular, to its normal spinning position (spinning pressure on, spinneret 40 closed as in Figure 1). Figure 3A(as shown). The next process steps then proceed as described elsewhere. The second return of the yarn 8 follows, and the drafting device 101, or its lower rollers 20, 22, 24, 26, is / are accelerated according to the parameters described elsewhere in step 9. For this purpose, the parameters in step 9 are specifically adjusted so that they can be used to transport the fibers to the spinneret 40. Significantly longer times are entered for this purpose. Fig. 4 The spinner ramp is shown schematically for this case (not to scale).

[0115] Fig. 4Figure 1 shows a schematic representation of a spinner ramp 420 of a driven output roller 26 compared to a spinner ramp 410 of a driven roller of a yarn take-up unit. The X-axis represents time 415 in milliseconds (ms). The Y-axis represents the speed of the output roller 26 or the driven roller of the yarn take-up unit, approximately in revolutions per minute. In a specific time interval (negative time interval), a fiber spool feed 400 is implemented. The output roller 26 is already being driven, which is why a spinner ramp 420 is already forming at this time. The yarn take-up unit is still deactivated at a zero point (chosen as the starting point for the speed increase of the driven output roller 26 in a spinner ramp 420). This enables the following:

[0116] In particular, the initial start-up of the belt underroller drive 34 and the output underroller drive 36 occurs without the fiber belt 31 during this initial time period. This prevents the breakaway torque from having an effect in this zone. Furthermore, the spinning process is initiated with the drafting unit 101 already running, which can reduce stress in the fiber belt 31.

[0117] Fig. 5Figure 1 shows a schematic representation of a spinner ramp 530 with a support point 550. The speeds 505 are plotted against the time 515. This results in spinner ramps 510 for a yarn take-up roller drive or for the driven yarn take-up roller, a spinner ramp 520 for an output underroller drive 36 or for the driven output underroller 26, and a spinner ramp 530 with a support point for a belt underroller drive 34 or for the driven belt underroller 24. A first speed stage 551 is formed before a first support point 550. The yarn take-up can remain for a dwell time 540. The dwell time 540 of the yarn take-up is such that the yarn end is held in the spinning chamber and allows the preparation of the drafting device 101 to be set. This is described in step 10 in the Fig. 1The process is shown and described in this regard. The yarn take-up unit starts up, in particular after its dwell time of 540 has elapsed, according to the input acceleration, while the drawing device 101 also starts up. The yarn is then drawn out of the spinning chamber, and the spinning process is completed, in particular after the start-up times have elapsed. The total start-up time 560 of the drawing device 101 is specified, as is the total start-up time 570 of the yarn take-up unit.

[0118] Fig. 6Figure 1 shows a schematic representation of a spinner ramp 630 for an output roller drive or for the driven output roller 26 with S-shaped groove 610, 620 as an example of a process parameter. The speed 605 is plotted against time 615. The acceleration of the drives (of the rollers 20, 22, 24, 26) is not exclusively linear, but follows an S-curve, which can be adjusted. This prevents extreme accelerations. The S-shaped groove 610, 620 can be implemented for both the yarn take-up and the drafting device 101 or its driven rollers 20, 22, 24, 26.

[0119] Fig. 7Figure 1 shows ramp-up speeds (speed 705 over time 715) of the drafting device 101, whereby only one support point 725 can be formed during ramp-up, in the case of a ramp-up speed 710 of a thread take-up roller drive. A ramp-up speed 720 of an output lower roller 26 is shown, as is the ramp-up speed 730 of an input lower roller 20. The corresponding embodiments of the Fig. 5 from here.

[0120] Fig. 8 Figure 1 shows ramp-up speeds (speed 705 over time 715) of the drafting device 101, where, by way of example, three support points 725, 735, 745 can be formed during ramp-up at a ramp 720 of an exit lower roller 26. The corresponding designs of the Fig. 5 and 7From here on. The three support points 725, 735, 745 signify, in particular, the establishment of a variable speed 705, which can be reached after a variable time 715. This change, for example, prevents the spinners from becoming thin after the tying-in zone. This results, in particular, in a more flexible structure of the fiber mass during spinning.

[0121] The term "may" refers in particular to optional features of the invention. Accordingly, there are also further developments and / or embodiments of the invention that additionally or alternatively include the respective feature(s).

[0122] From the combinations of features disclosed herein, isolated features can also be selected as needed and, by dissolving any structural and / or functional relationship that may exist between the features, used in combination with other features to define the subject matter of the claim. Reference symbol list 1 Catching the end of a thread 32 Center underroller drive 34 Belt roller drive 2 Placement of a thread section into the take-up 36 Output underroller drive 40 Spin nozzle 3 Cutting the thread with scissors 42 Spin cone 100 Spinning process 4 Unraveling the thread end 101 Stretching device 5 first return of the thread 400 Fiber tape insertion 6 Making a thread loop 410 Spindle ramp for a thread take-up drive 7 Comb out and keep warm 8 second repatriation 405 speed 9 Stopping the output lower roller 415 Time 10 Length of stay 420 Spinner ramp for an exit roller drive 11 Thread pull time 12 carrier 505 speed 13 upper extraction 510 Spinder ramps for a thread take-up drive 14 fragments 15 lower suction 515 Time 16 Locking device 520 Spinnaker ramp 18 Adjustment device 530 Spinnaker ramp with one support point 20 Entrance lower roller 21 Fiber inlet 540 Length of stay 22 Middle lower roller 550 individual base 23 Fiber extraction 551 speed level 24 belt roller 560 Total ramp-up time of the drafting device 25 Separation area 26 Output lower roller 570 Total lead-up time of the thread pull 27 Output top roller 28 straps 605 speed 29 Slip bridge 610, 620 S-shaped cut 30 Input roller drive 615 Time 31 Fiber tape 630 Spinner ramp of a Output bottom roller with S-shaped grind 720 ramp of an exit roller 705 speed 730 ramp of a 710 Ramp of a thread take-off roller drive 725, 735, 745 Input underroller supports 715 Time

Claims

1. Drafting device (101) for a textile machine, in particular an air-jet spinning machine, wherein the drafting device (101) has several pairs of rollers that can be driven independently of one another, wherein the pairs of rollers are designed and arranged to guide a fiber strip (31) between an upper roller and a lower roller of the respective pairs of rollers during their rotational operation in order to stretch the fiber strip (31); and wherein the drafting device (101) is designed and set up to carry out a spinning process (100) after the fiber strip (31) has been cut in the drafting device (101). characterized by the fact that the drawing device (101) is designed and set up to add at least two pairs of rollers via their drive in the spinning process (100).

2. Stretching device (101) according to claim 1, characterized by the fact thatat least two pairs of rollers are selected for a defined activation from the list of the following pairs of rollers: - input roller pair, - intermediate roller pair and / or - belt roller pair.

3. Stretching device (101) according to one of claims 1 or 2, characterized by the fact that a spinning nozzle (40), in particular an air spinning nozzle, is designed and configured to assume at least one cleaning position.

4. Stretching device (101) according to one of the preceding claims, characterized by the fact that the drawing device (101) is designed and configured to separate the fiber strip (31) by a coordinated addition of at least one pair of rollers, in particular by a coordinated addition of at least two pairs of rollers.

5. Stretching device (101) according to one of the preceding claims, characterized by the fact thatthe drawing device (101) is designed and set up to coordinate the separation of the fiber ribbon (31) by means of a coordinated addition of at least one pair of rollers, in particular by means of a coordinated addition of at least two pairs of rollers, with a transfer of a spinneret (40) into a cleaning position.

6. Stretching device (101) according to one of the preceding claims, characterized by the fact that the stretching device (101) is designed and set up to specifically adjust at least one process parameter for driving at least one of the pairs of rollers, in particular at least two of the pairs of rollers, over a defined period (715).

7. Stretching device (101) according to one of the preceding claims, characterized by the fact thatthe stretching device (101) is designed and set up to form at least two support points (725, 735, 745) in a ramp-up profile for the defined driving of at least one of the roller pairs during a spinner ramp.

8. Stretching device (101) according to one of the preceding claims, characterized by the fact that the drawing device (101) is designed and configured to maintain a defined temperature of the drive of one of the roller pairs and / or of a rubber covering of the rollers of one of the roller pairs, particularly while the spinning station is inactive.

9. Spinning station comprising - at least one spinneret (40), in particular an air spinneret; - at least one yarn end preparation; and - at least one yarn take-up; wherein the spinneret (40) and the yarn end preparation are arranged and configured to initiate spinning; and wherein the yarn take-up is arranged and configured to discharge a yarn from the spinneret after a spinning process; characterized by the fact that at least one driveable roller pair of a stretching device (101), in particular the stretching device (101) according to one of claims 1 to 8, is switched on in a coordinated manner via the drive of the roller pair.

10. Spinning station according to claim 9, characterized by the fact that The yarn take-up is designed and set up in such a way as to be switched on in a coordinated manner to the at least one pair of rollers, wherein a ramp-up profile of the at least one pair of rollers has a spinner ramp (710, 720, 730) with at least two support points (725, 735, 745).

11. Spinning station according to one of claims 9 or 10, characterized by the fact that the spinning nozzle (40) is designed and configured to assume at least one operating position and a cleaning position different from it; and - the thread end preparation is designed and configured to at least loosen a thread end by means of a compressed air supply.

12. Method (100) comprising at least one of the following steps: - separating a fiber ribbon by coordinated activation of at least one pair of rollers, in particular at least two pairs of rollers, of a drawing device (101), in particular a drawing device (101) according to one of claims 1 to 8; - spinning by coordinated activation of at least two pairs of rollers of the drawing device (101), in particular the drawing device (101) according to one of claims 1 to 8; and - spinning by coordinated activation of at least one yarn take-up from a spinning station, in particular a spinning station according to claim 9, in particular to return a yarn end, in particular to a spinning nozzle;- of spinning a thread, in particular after spinning has taken place, comprising a coordinated addition of thread take-up and at least one pair of rollers of the drawing device (101), in particular the drawing device (101) according to one of claims 1 to 8.; 13. Control device designed and configured to perform a method (100) according to claim 12.

14. Textile machine comprising at least one of the following: - a drawing device (101) according to any one of claims 1 to 8; - a spinning station according to any one of claims 9 to 11; and - a control device according to claim 13; and / or wherein the textile machine is designed and configured to perform a method (100) according to claim 12.

15. Computer program product configured to execute a method (100) according to claim 12 when executed on a control device, in particular a control device according to claim 13, a textile machine, in particular a textile machine according to claim 14.

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