CN113355773A

CN113355773A - Method for operating a spinning or winding machine and spinning or winding machine

Info

Publication number: CN113355773A
Application number: CN202110233199.2A
Authority: CN
Inventors: A·斯蒂芬
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 2020-03-06
Filing date: 2021-03-03
Publication date: 2021-09-07
Also published as: DE102020106127A1; EP3875410A1

Abstract

In a method for operating a spinning or winding machine having a plurality of working stations arranged side by side, each of said working stations has: a yarn feeding device for carrying a yarn; a take-off device for taking off the yarn; a winding device for winding the yarn on a reel; and a yarn storage for temporarily storing the yarn loop generated at the time of piecing. At the beginning of a new thread batch, a batch-related optimized start curve of the winding speed is determined by means of a control device at least one of the operating positions, wherein the thread loops in the thread store are detected by means of at least one sensor at the at least one operating position, and the winding speed of the winding device is set as a function of the signal of the at least one sensor. The measured optimized starting curve is preset as a nominal value trend of the winding speed to other working positions of the spinning or winding machine for processing the same batch.

Description

Method for operating a spinning or winding machine and spinning or winding machine

Technical Field

The invention relates to a method for operating a spinning or winding machine having a plurality of working stations arranged side by side, wherein each working station has: a yarn feeding device for conveying a yarn, in particular a spinning device; a take-off device for taking off the yarn; a winding device including a winding driver for winding the yarn around the spool; and a yarn storage for temporarily storing the yarn loop generated at the time of piecing. The invention also relates to a corresponding spinning or winding machine, wherein a control device for controlling the winding drive is provided.

Background

In a spinning or winding machine, a yarn carried by a spinning device or a payout reel is drawn out by a drawing device and wound on a spool by a winding device. In the process, if a yarn break or a thread break occurs in one of the working positions, the relevant working position on the spinning or winding machine is shut down. Subsequently, the yarn has to be spliced again, i.e. pieced or spliced, and the relevant work station is put back into operation. When the operating position is started, a difference in rotational speed can occur between the transport device and the take-off device or between the take-off device and the winding device, resulting in a temporarily excessively long portion of the yarn. These yarns must be contained in a yarn storage otherwise the reel cannot be wound with the necessary winding tension and a defective reel is produced.

If the splicing is carried out by means of a mobile maintenance device, this temporary excess can be accommodated in the yarn storage of the maintenance device. If the working positions of the spinning or winding machine are designed as autonomous or at least semi-autonomous working positions, a yarn store of this type must be provided in each individual working position. The yarn accumulator is usually constructed as a pneumatic pressurized yarn accumulator. The air consumption of these thread accumulators is relatively high, since the thread accumulator must be subjected to a negative pressure throughout the joining process.

DE 102006047288 a1 describes a textile machine in which a pneumatic yarn store is provided at each individual working position. It is proposed in this case that the thread accumulator is designed to be individually switchable, so that it can be isolated from the underpressure if not required. For this purpose, the release of the thread loop is monitored by a sensor, and the thread storage is switched to pressureless as soon as the thread loop leaves the thread storage. This reduces the negative pressure consumption of the spinning machine. However, the solution of providing a sensor at each individual working position is relatively expensive.

In order to quickly re-release the stored yarn loops, the spool is typically driven during splicing or at a speed greater than the normal winding speed. But defective reels or yarn breaks can occur due to the non-uniform winding tension in the storage and when the loop is unwound. That is, desirably, the application of the negative pressure and the winding speed of the reel need to be matched to the formation and release of the yarn loop during the starting process.

Disclosure of Invention

The object of the present invention is to provide a method of operating a spinning or winding machine and a spinning or winding machine which enable the winding speed at the start of the operating position to be adjusted in a simple and cost-effective manner.

The solution of the invention is to achieve the above object.

In a method for operating a spinning or winding machine, in particular a rotor spinning machine, having a plurality of work stations arranged side by side, each work station has therein: a yarn feeding device for conveying a yarn, in particular a spinning device; a take-off device for taking off the yarn; a winding device including a winding driver for winding the yarn around the spool; and a yarn storage for temporarily storing the yarn loop generated at the time of piecing.

Spinning or winding machine, in particular a rotor spinning machine, in particular for carrying out the aforementioned method, having a plurality of work stations arranged side by side, wherein each of the work stations has: a yarn feeding device for conveying a yarn, in particular a spinning device; a take-off device for taking off the yarn; a winding device including a winding driver for winding the yarn around the spool; and a yarn storage for temporarily storing the yarn loop generated at the time of piecing. Furthermore, a control device for controlling the winding drive is provided.

In the method for operating a spinning or winding machine, an optimized start curve of the winding speed is determined at least in one of the operating positions in relation to the batch by means of a control device when a new batch is started. In particular, the yarn loop in the yarn store is detected in the operating position by means of at least one first sensor, and the winding speed of the winding drive is set as a function of the signal of the at least one first sensor. The optimized start curve thus determined is then preset as a setpoint value profile to further operating positions of the spinning or winding machine that are processing the same batch. In detecting or detecting the loop of yarn, one or more sensors can be used to detect both the presence and the length of the loop of yarn.

When setting the winding speed, the reel is accelerated as slowly as possible to prevent jerking of the thread and jumping of the reel. However, this results in relatively long loops of yarn, so that the entire length of the yarn store must be used as much as possible to store the excess yarn. On the other hand, however, the yarn loop should be released again as quickly as possible in order to keep the negative pressure consumption at the operating position as low as possible. Therefore, when the operating position is started, the winding speed is preferably set as a function of the signal of the at least one sensor, so that the yarn loop is unwound as quickly as possible with the winding shaft acceleration being as slow as possible.

In a corresponding spinning or winding machine, at least one first sensor for detecting a thread loop in the thread store is arranged on at least one of the operating positions. The sensor is connected to the control device by means of a signal line. The control device and/or the further control device are/is adapted to set the winding speed of the winding drive in the above-described manner on the basis of the signal of the at least one sensor and to determine a batch-dependent optimized start profile of the winding speed. The control device and/or a further control device are also suitable for controlling the winding drive of the spinning or winding machine in other operating positions by means of the optimized starting curve.

The operating position is thus designed as a so-called pilot operating position, at which a start curve for an optimized winding speed for a particular yarn batch can be determined, which is used to maintain the necessary winding tension and to achieve a smooth reel acceleration. In order to determine this optimum start-up curve, the work station must optionally be started up several times with different control of the winding speed and it is checked whether yarn breaks or sagging yarns occur in the process. If an optimized start-up curve is determined by means of a control device, for example, a station control device of the respective station, this start-up curve can be transmitted to the other station control devices via the machine control device or directly. In this case, the other stations can set their winding speed according to the optimized starting curve when the splicing is performed. However, the optimized start-up curve can also be stored for later use in the setting of further operating positions. Therefore, no expensive sensor devices need to be associated with the yarn accumulator for all working positions. This allows the spinning or winding machine to be arranged in a cost-effective manner.

According to a first embodiment, advantageously, the release of the loop of yarn is detected by means of the first sensor. In a spinning or winding machine, the first sensor is advantageously arranged in the region of the outlet opening of the yarn store. For example, when a loop of yarn is sucked into the yarn store, the sensor detects this loop of yarn for the first time. Subsequently, when the loop is pulled back from the yarn store, the sensor detects this loop a second time, which indicates that the loop has been released. If the sensor transmits a signal that the thread loop is released, the supply of underpressure to the thread accumulator can already be switched off.

Advantageously, the winding speed is reduced from the increased winding speed to the normal winding speed as soon as the first sensor detects the unwinding of the yarn loop. In order to make the unwinding of the yarn loop as fast as possible, the reel is usually driven briefly at an increased winding speed. Once the sensor registers that the yarn loop is unwound, the winding speed can be reduced to the normal winding speed at the correct point in time. The optimum time points measured in the manner described above can then also be taken into account by means of the optimized start curve in other operating positions in which no sensor is assigned.

Furthermore, the length of the yarn loop is advantageously detected by means of a second sensor. For this purpose, in a spinning or winding machine, the second sensor is advantageously arranged, for example, in the end region of the yarn store. In the case that the second sensor in the end region of the yarn store does not transmit any signal or has not yet identified the end of the yarn loop, the movement can continue with a slow reel acceleration, since the yarn loop has not yet reached the end of the yarn store. However, it is of course also possible to arrange a plurality of sensors in the thread store in order to determine the length of the thread loop more precisely and to adjust the winding speed more sensitively.

Furthermore, it is advantageous to detect the maximum length of the yarn loop by means of a second sensor and to increase the winding speed in case the maximum length of the yarn loop is detected by the second sensor. For this purpose, the second sensor is likewise arranged in the end region of the yarn store or directly on the end. As soon as the loop reaches the second sensor, which registers this and emits a corresponding signal, there is a risk that the loop is too long to reach the negative pressure channel of the machine. In this case, the winding speed is therefore increased, so that the loops which are too long return to the desired size as quickly as possible.

It is also advantageous to determine a plurality of optimized start curves for different reel diameters at the start of a new yarn batch. This allows for different starting characteristics for different reel diameters or different winding lengths and different reel weights. For this purpose, advantageously one or optionally a plurality of sample spools are wound at the beginning of a new yarn batch.

It is particularly advantageous if the thread storage of at least one working position has an electrical and mechanical interface for temporarily accommodating at least one sensor, or in the method only the first and/or second sensor is temporarily arranged on the working position. This allows each station with such an interface to become a pilot station temporarily.

In addition, advantageously, a batch-related program for determining an optimized start profile of the winding speed is stored in the control device and is activated if the start profile needs to be determined in at least one operating position.

Wherein the program may be preset only at certain specific working bits. However, it is also possible to provide each work station of the spinning or winding machine with an electrical and mechanical interface for the sensors and to store the program in each work station control device, for example, or to install the program there, if necessary. Thus, any work site can be temporarily used as a trial work site.

Furthermore, it is advantageous to store the batch-related optimized start-up curves in a memory, in particular in an item management database. It is also advantageous to store not only the optimized start profile, but also the sensor data on which the start profile is based. The measured start curve can therefore likewise be checked again at a later point in time.

Furthermore, advantageously, when the same yarn batch is produced again, the start curve stored in the memory and relating to the batch is retrieved and is preset as a setpoint value for the working position of the spinning or winding machine for processing this yarn batch. This eliminates the need to re-determine the start-up profile when the same yarn batch is produced again. Furthermore, the saved start-up profile can also be used as an initial setting for a similar new yarn batch.

Drawings

Further advantages of the invention are described in the following description of the embodiments. Wherein:

figure 1 is a schematic view from the front in overview of a spinning or winding machine,

FIG. 2 is a schematic side view, partly in section, of a working position of a spinning or winding machine according to a first embodiment in a conventional production operation,

figure 3 is a schematic view of the operating station of figure 2 during the formation of the yarn loop,

figure 4 is a schematic view of the operating position of figure 2 during the release of the loop of yarn,

fig. 5 is a schematic side view, partly in section, of an operating station of a spinning or winding machine in a second embodiment during the formation of a yarn package, an

Fig. 6 is a detail view in partial cross-section of a yarn store with an electrical or mechanical interface for the sensor.

Detailed Description

In the following description of the embodiments, identical features or features which are at least similar in terms of technical solution and/or operating principle are denoted by the same reference numerals. Furthermore, these features are explained in detail only when they are mentioned for the first time, while in the following exemplary embodiments only the differences from the exemplary embodiments already described are explained. Furthermore, for the sake of clarity, only one or a few of a plurality of identical components or features are generally labeled.

Fig. 1 shows a schematic front view of a spinning or winding machine 1. The spinning or winding machine 1 has a plurality of working positions 2 arranged side by side, which can be arranged on only one longitudinal side of the spinning or winding machine 1 or can also be arranged on two opposite longitudinal sides. The work station 2 is arranged here between two racks 9, on which a central component or a central function, for example a central drive, can be arranged. Only the machine control device 13 is shown here as a central control device 17. Each work station 2 has, in a known manner, a yarn feed device 3, which can be designed as a spinning device or as a pay-off reel. The yarn 5 carried by the yarn feeder 3 is drawn off by means of the draw-off device 22 and, depending on the particular embodiment of the spinning or winding machine 1, is fed, optionally via a number of further components or processing mechanisms, to the winding device 4, where it is wound onto the reel 6, which is rotated by means of the winding roller 8.

According to the present illustration, each work station 2 also has a work station control device 12 as a control device 17, which is connected to the machine control device 13. As an alternative to the embodiment shown, however, a plurality of work stations 2 can also be controlled by a common control device 17. In addition, further control devices 17 can also be provided, for example, additionally on the station level.

The individual working positions 2 of the spinning or winding machine 1 are designed here as so-called autarkic or at least semi-autarkic working positions 2. Such a work station 2 is at least capable of restarting the production process by itself after a production interruption. For this purpose, each work station 2 has its own, not shown, attachment device, such as a coupling device or a joining device. Furthermore, a thread accumulator 7 is provided at each work station, which can accommodate excess thread length during the splicing process, as will be explained in connection with fig. 2.

Depending on the specific embodiment of the spinning or winding machine 1, it is also possible to produce different yarn batches 18 on a single spinning or winding machine 1. It is provided that, depending on the specific working position, at least a part of the working mechanisms of the working position 2 of the spinning or winding machine 1 are driven by separate drives 24 (see fig. 2) or at least centrally driven in groups. The working mechanisms are, for example, the yarn feeding device 3, the drawing device 22, the winding device 4 and possibly other working mechanisms. For example, if the working mechanisms on both longitudinal sides are driven on the spinning or winding machine 1 by means of a central drive on each longitudinal side, different thread batches 18 can be produced on both longitudinal sides of the spinning or winding machine 1.

If, as shown in fig. 2, separate drives 24 are provided at least for a part of the working mechanism (see fig. 2), a free correspondence of the working positions 2 to the different thread batches 18 is substantially achieved. The working positions 2 of the spinning or winding machine 1 correspond here, for example, to three different thread batches 18.

As will be explained below in conjunction with fig. 2, at least one work station 2 is at least temporarily designed as a pilot work station 11. In this case, for example, three work stations 2 are designed as test point work stations 11, wherein each of the three thread batches 18 corresponds to one test point work station 11. However, this correspondence between each test point station 11 and each thread batch 18 is by no means mandatory. One thread batch 18 can likewise correspond to a plurality of test point work stations 11; furthermore, some thread batches 18 may not correspond to any test point work station, but may apply a set value or start profile that has been previously measured.

Fig. 2 shows a schematic side view in partial section of a working place 2 of a spinning or winding machine 1, which is constructed as a pilot working place 11, in a conventional production operation. In this example, the drawing device 22 and the winding device 4 are each driven by a separate drive 24 and are each controlled by the operating position control device 12.

In addition to the components already described with respect to fig. 1, the work station 2 has a suction nozzle 19 which is arranged fixedly on the work station 2 and can be used to find the thread end running onto the reel 6. In the normal production operation shown, the yarn 5 passes through the suction nozzle 19, it enters the suction nozzle through the opening 20 and is discharged at an outlet (not shown). The suction nozzle 19 can also be embodied so as to be deflectable. The suction nozzle 19 can be applied with a negative pressure through the negative pressure passage 21. The underpressure towards the suction nozzle 19 can be shut off by means of the shut-off member 23, so that this suction nozzle is only sucked if the yarn 5 actually has to be found.

Furthermore, a pneumatic thread accumulator 7 is shown, which is likewise connected to the vacuum channel 21 via a shut-off member 23. The suction of the yarn store 7 is therefore also only applied when the yarn 5 actually needs to be stored. In the normal operation shown here, the two shut-off members 23 are in a closed position, in which they shut off the connection to the negative pressure channel 21. The working position 2 shown is designed as a test-point working position 11, in which a sensor 10 for detecting a thread loop 14 is arranged in the thread store 7 (see fig. 3). Only the first sensor 10a is arranged in the outlet region 15 of the yarn storage 7. The sensor 10a is connected to the control device 17, i.e., the station control device 12, via a signal line (dashed line).

Fig. 3 now shows the operating position 2 from fig. 2 during the start-up after a yarn or thread break has occurred. In this case, the work station 2 is first turned off. Subsequently, the yarn 5 of the work station 2 must be spliced and the work station 2 activated. At start-up, the take-off device 22 and possibly the transport device 3 are accelerated considerably faster than the winding device 4 with the relatively heavy reel 6. This produces an excess yarn which is received and held in the form of a yarn loop 14 in the pneumatic yarn store 7 in order to maintain the necessary winding tension. The yarn loop 14 is still further increased after its first suction, based on the difference in rotational speed between the winding device 4 and the drawing device 22, until the winding device 4 and the drawing device 22 finally reach substantially the same speed and the yarn loop 14 reaches its maximum length. Fig. 3 shows this situation. In order to receive and hold the thread loop 14, the shut-off member 23 of the thread store 7 is moved from the closed position into the open position shown in time before or at the beginning of the joining process.

The first sensor 10a is now preferably arranged in the outlet area 15 of the yarn store 7 in such a way that it detects the end 14a of the loop of yarn 14 only when it passes the first sensor 10 a. Thus, in this figure, the first sensor 10a has detected for the first time the end 14a of the loop 14 and reported it to the station control 12. The operating position control thus knows that the thread loop 14 is successfully sucked into the thread store 7.

Fig. 4 shows the working position 2 from fig. 2 in a third situation, in which the yarn loop 14 has just been released. When the working position 2 is started, on the one hand, it is desirable that the winding device 4 is accelerated as slowly as possible flat; on the other hand, however, it is desirable to release the formed yarn loop again as quickly as possible and to re-close the connection of the yarn store 7 to the vacuum channel 21 as quickly as possible in order to avoid unnecessary vacuum consumption. Therefore, once the winding device 4 is synchronized with the drawing device 22, the winding device 4 is usually driven briefly at a winding speed greater than the usual winding speed, so that the yarn loop 14 is released quickly. Once the loop 14 of yarn is released, the shut-off member 23 of the yarn store 7 is moved back into the closed position and the winding speed is reduced back to the normal winding speed.

The first sensor 10a can detect precisely the point in time at which the thread loop 14 is released and at the precise point in time the winding speed is reduced again. This is important because operation at higher winding speeds after the yarn loop 14 is unwound necessarily results in yarn breakage. Prematurely reducing this increased winding speed also results in a reduction of the winding tension, thus forming a loose or defective winding reel 6. The release of the loop 14 is detected as follows: when the end 14a of the loop of yarn passes by the first sensor 10a, the first sensor 10a detects the end a second time.

The operating position 2 is designed as a pilot operating position 11 by means of the first sensor 10a, so that an optimized starting curve of the winding speed can be determined. In this case, it is possible to observe whether a yarn break occurs due to an excessively high yarn tension or a winding failure occurs due to an excessively low winding tension during the start-up process. If necessary, one or more sample reels may be wound and subsequently checked for desired characteristics. During each start, the time-dependent starting curve, i.e. the starting speed, of the winding arrangement 4 is detected, for example, by means of the control device 17, in this case the operating position control device 12. Based on the at least one sensor 10a, a point in time at which the increased winding speed is restored to the regular winding speed based on the signal of the sensor 10a can be accurately detected. It is generally possible to optimize the course of the winding speed over time after a plurality of starting processes and to create an optimized starting curve.

Such an optimized starting curve is preferably measured several times during the winding of the reel, in order to detect different starting characteristics in the case of different reel diameters. For example, an optimized start-up curve of 5 to 10 different steps of reel diameter can be determined. Preferably, an optimized start-up curve is determined for at least the smallest and the largest reel diameters, respectively. For this purpose, one or more sample reels can likewise be wound.

If in this way, for example, an optimized starting curve for the winding speed is determined by means of the control device 17, i.e. the operating position control device 12, this starting curve can be transmitted directly from the control device 17, i.e. the operating position control device 12, of the pilot operating position 11 to other operating position control devices 12 which are not designed as operating positions 2 of the pilot operating position 11. It is likewise possible to transmit the optimized start curve first to the machine control 13 and from there to the other station control 12. For this purpose, the machine control device 13 is in a control connection with the station control device 12, as indicated by the dashed line. Alternatively, it is of course also possible to store the start-up curve in the control device 17 and to read it from this control device in order to supply it to the other control devices 17, in particular to the other operating position control devices 12. It is also possible, of course, to determine the optimized start-up curve by means of a further control device 17 as the operating position control device 12.

In any case, the winding speed can be set in an optimum manner at the start-up time on the other work stations 2 not designed as test-point work stations 11 by means of an optimized start-up curve, without a sensor 10a being provided on each work station 2. For this purpose, the optimized start curve is preset as a setpoint profile for the other operating positions.

Fig. 5 shows a further embodiment of a work station 2 which is designed as a pilot work station 11. In contrast to the operating position of fig. 2, a second sensor 10b is provided in the thread store 7 in addition to the first sensor 10 a. This second sensor is arranged in the end region 16 of the yarn store 7. By means of this second sensor 10b, it is possible to detect not only the release of the loop 14, but also the presence of the loop 14 in a certain specific area of the yarn store 7, and thus the length of the loop 14.

In order to accelerate the winding device 4 as slowly and gently as possible, it is advantageous to make the yarn loop 14 as long as possible. If the second sensor 10b is arranged as shown in the end zone 16 of the yarn store 7, it is possible to detect whether the end 14a of the yarn loop 14 reaches the end zone 16 and thus whether the yarn loop 14 has an optimal length. The slowest reel acceleration that can also be used to achieve the optimum length of the thread loop 14 can be determined by means of the second sensor 10b by a plurality of starting processes. For this purpose, the sensor 10b is preferably arranged in the end region 16 of the yarn store 7, but at a distance from the actual end of the yarn store 7, which end is marked with the shut-off member 23.

But it is equally possible to detect the maximum length of the loop 14 by means of the second sensor 10b or by means of another sensor 10. The maximum length of the loop of yarn 14 is reached, for example, when the end 14a of the loop of yarn 14 reaches the shut-off member 23, because in this case there is a risk that the loop of yarn 14 will clamp onto the shut-off member 23. Alternatively, the maximum length of the yarn loop 14 can also be defined by reaching the underpressure channel 21, since in this case there is a risk of the yarn section becoming stuck in the underpressure channel. In this case, the sensor 10b is arranged at a position marking the maximum length of the loop of yarn 14, for example next to the shut-off member 23.

If the end 14a of the loop 14 is detected by the sensor 10b, the control device 17, i.e. the station control device 12, knows that the maximum length of the loop 14 has now been reached. In this case, the winding speed is increased to prevent further growth of the yarn loop 14 and associated entanglement. In this way, it is possible to take into account not only the exact point in time at which the loop 14 is unwound, but also the slowest possible spool acceleration and the point in time at which the maximum length of the loop is reached, when determining the optimized starting curve.

As shown in fig. 6, the at least one first sensor 10a and, as the case may be, the second sensor 10b are not necessarily fixedly arranged in the thread storage 7, but can also be temporarily provided to use the working position 2 as a pilot working position 11. Fig. 6 shows a partial schematic detail of such a yarn store 7. For temporary use as a test-point working position 11, the thread store 7 of this working position 2 has a mechanical interface 26 or an electrical interface 25 for receiving the sensors 10, 10a, 10 b. In this way, the work place 2 can be converted into the test point work place 11 simply by installing the sensors 10, 10a, 10 b.

In order to implement the pilot function on the work station 2, a corresponding control program is also stored in the control device 17, for example in the work station control device 12, which control program contains all the control and evaluation functions required as a function of the pilot work station 11 and has to be activated only by the operator.

The invention is not limited to the embodiments shown and described. Variations within the scope of the claims, and any combination of features shown and described, even in different parts of the description or claims, or in different embodiments, are possible without departing from the principle of the independent claims.

List of reference numerals

1 spinning or winding machine

2 working position

3 yarn feeding device

4 winding device

5 yarn

6 reel

7 yarn storage

8 winding roller

9 frame

10 sensor

10a first sensor

10b second sensor

11 pilot test station

12-station control device

13 machine control device

14 yarn loop

14a yarn loop end

15 outlet region of yarn storage

16 end region of a yarn store

17 control device

18 thread yarn batch

19 suction nozzle

20 opening of suction nozzle

21 negative pressure channel

22 leading-out device

23 shut-off member

24 independent driver

25 electrical interface

26 mechanical interface

Claims

1. A method of operating a spinning or winding machine (1), in particular a rotor spinning machine, having a plurality of work stations (2) arranged side by side, wherein each work station (2) has: a yarn feeding device (3), in particular a spinning device, for transporting a yarn (5); a take-off device (22) for taking off the yarn (5); -winding means (4) for winding said yarn (5) on a reel (6); and a yarn store (7) for temporarily storing the yarn windings (14) produced during piecing, characterized in that, at the start of a new yarn batch (18), an optimized start curve of the winding speed is determined in relation to the batch at least one of the operating positions (2) by means of a control device (17), wherein the yarn windings (14) in the yarn store (7) are detected at the at least one operating position (2) by means of at least one sensor (10, 10a, 10b), and the winding speed of the winding device (4) is set as a function of the signal of the at least one sensor (10, 10a, 10b), and the optimized start curve is preset as a setpoint course of the winding speed to the spinning or winding machine (1) for the other operating positions (2) of the same batch.

2. Method according to claim 1, characterized in that the release of the loop of yarn (14) is detected by means of a first sensor (10, 10 a).

3. Method according to claim 1 or 2, characterized in that the winding speed is reduced from an increased winding speed to a regular winding speed as soon as the first sensor (10, 10a) detects that the yarn loop (14) is unwound.

4. Method according to any of the preceding claims, characterized in that the length of the loop of yarn (14) is detected by means of a second sensor (10, 10 b).

5. Method according to any of the preceding claims, characterized in that the maximum length of the yarn loop (14) is detected by means of the second sensor (10, 10b) and that the winding speed is increased in case the maximum length of the yarn loop (14) is detected by the second sensor (10, 10 b).

6. Method according to any of the preceding claims, characterized in that at the start of the new yarn batch (18) a number of optimized start-up curves are determined for different reel diameters.

7. Method according to one of the preceding claims, characterized in that the first and/or second sensor (10, 10a, 10b) is arranged only temporarily on the at least one work place (2).

8. Method according to any one of the preceding claims, characterized in that a program for determining an optimized start curve of the winding speed in relation to the batch is stored in the control device (17) and that the program is activated when a start curve needs to be determined on the at least one work station (2).

9. Method according to any of the preceding claims, characterized in that the lot-related optimized start-up curves are stored in a memory, in particular an item management database.

10. Method according to any one of the preceding claims, characterized in that when the same yarn batch (18) is produced again, a batch-related start-up curve stored in the memory is retrieved and is preset as a nominal value to a working position (2) of the spinning or winding machine (1) where the yarn batch (18) is processed.

11. A spinning or winding machine (1), in particular a rotor spinning machine, having a plurality of working stations (2) arranged side by side, wherein each working station (2) has: a yarn feeding device (3), in particular a spinning device, for transporting a yarn (5); a take-off device (22) for taking off the yarn (5); -winding means (4) for winding said yarn (5) on a reel (6); and a yarn store (7) for temporarily storing yarn loops (14) produced during splicing, and wherein a control device (17) is provided, characterized in that at least one sensor (10, 10a, 10b) for detecting yarn loops (14) in the yarn store (7) is arranged on at least one of the operating positions (2), wherein the sensor (10, 10a, 10b) is connected to the control device (17) by means of a signal line, the control device (17) and/or a further control device (17) being adapted to set a winding speed of the winding device (4) as a function of the signal of the at least one sensor (10, 10a, 10b) and to determine an optimized start curve of the winding speed in relation to the batch, and the control device (17) and/or the further control device (17) being adapted to, the winding device (4) of the other working positions (2) of the spinning or winding machine (1) is controlled by means of the optimized starting curve.

12. Spinning or winding machine (1) according to claim 11, characterized in that a first sensor (10, 10a) is arranged in the outlet area (15) of the yarn storage (7).

13. Spinning or winding machine (1) according to claim 11 or 12, characterized in that a second sensor (10, 10b) is arranged in an end region (16) of the yarn storage (7).

14. Spinning or winding machine (1) according to any one of the previous claims, characterized in that the yarn storage (7) of said at least one work station (2) has an electrical interface (25) and a mechanical interface (26) for temporarily housing said at least one sensor (10, 10a, 10 b).

15. Spinning or winding machine (1) according to any one of the previous claims, characterized in that the spinning or winding machine (1) is assigned a memory, in particular an article management database, in which the optimized start-up profile of the winding speed in relation to a batch can be stored.