CN114524326A

CN114524326A - Method for determining the weight of a cross-wound bobbin

Info

Publication number: CN114524326A
Application number: CN202111375552.7A
Authority: CN
Inventors: A·克鲁格; 乌尔里赫·费希特尔
Original assignee: Saurer Spinning Solutions & CoKg GmbH
Current assignee: Saurer Spinning Solutions & CoKg GmbH
Priority date: 2020-11-23
Filing date: 2021-11-19
Publication date: 2022-05-24
Also published as: DE102020130887A1; JP2022082520A

Abstract

The invention relates to a method for determining the weight of a cross-wound bobbin produced on a textile machine having a plurality of workstations, each workstation having a capacitive yarn clearer arranged in the region of the yarn path for the winding device for depositing the yarn on the cross-wound bobbin, which yarn clearer removes undesirable deviations in the quality of the yarn during the winding process. In order to allow an operator of a textile machine which produces cross-wound bobbins to know the productivity of the textile machine, the weight of the cross-wound bobbins produced at the workstation of the textile machine should be settable and as uniform as possible with respect to their bobbin weight. In order to achieve the above object, the invention provides that the yarn clearer successively detects the yarn quality of the advancing yarn and determines the yarn quality value, and that the yarn clearer detects the yarn to determine the weight of the cross-wound bobbin and determines the values which are added together over the yarn production length of the cross-wound bobbin.

Description

Method for determining the weight of a cross-wound bobbin

Technical Field

The invention relates to a method for determining the weight of a cross-wound bobbin produced on a textile machine having a plurality of workstations. Each station is provided with a winding device for laying the yarn on a cross-wound bobbin and a capacitance yarn cleaner arranged in the yarn moving path area for removing the undesired yarn quality deviation during the winding process. The invention also relates to a textile machine for producing cross-wound bobbins for carrying out the method.

Background

Such textile machines for producing cross-wound bobbins are designed, for example, as cross-winding automatic winding machines with a plurality of workstations, each having an unwinding position for a feed bobbin, a capacitive yarn clearer, which is arranged in the region of the yarn path and which removes undesirable deviations in the yarn quality, so-called yarn faults, during the winding process, a computing device and a winding device. However, such textile machines for producing cross-wound bobbins may also be designed as rotor or rotor spinning machines which also have corresponding winding devices.

In connection with the operation of textile machines which produce cross-wound bobbins, it is generally required on the operator side that the cross-wound bobbins produced at the workstations of such textile machines which produce cross-wound bobbins always have approximately the same yarn length or always approximately the same diameter. Corresponding devices and methods ensuring the fulfilment of said requirements are known and described in the various patent specifications of the patent literature.

DE4225842a1 describes, for example, a device or a method in which the speed of the continuous thread is determined by means of a travel time correlator, which is evaluated directly by means of an integrator to cumulatively determine the travel length of the textile thread wound on a cross-wound bobbin at a workstation. That is, the known device allows to form cross-wound bobbins always having the same yarn length.

DE10206761a1 and DE19625512a1 describe devices or methods for producing cross-wound bobbins each having the same diameter.

DE10206761a1 discloses, for example, a textile machine, the workstations of which each have a winding device which is equipped with a creel mounted for limited rotation, the creel being equipped with a measuring device which measures the diameter of the respective cross-wound bobbin during the winding process. The known measuring device is equipped with a measured value transmitter, which is connected to one of the creel arms via a transmission, so that a relatively small offset of the creel arm already results in a larger offset of the measuring element of the measured value transmitter. The measured values of the measuring transducer are then used by the processing station to calculate the cross-wound bobbin diameter.

DE19625512a1 describes a method by which the diameter of a cross-wound bobbin driven by means of a friction roller during its production can be determined.

In this known method, the angular velocity of the cross-wound bobbin is used in particular when determining the diameter of the cross-wound bobbin. The diameter of the cross-wound bobbin is calculated by dividing the peripheral speed of the surface of the cross-wound bobbin by the angular speed of the cross-wound bobbin, wherein the peripheral speed is calculated from the sensor signals of two sensors measuring the surface characteristics of the cross-wound bobbin one after the other at a fixed distance in the circumferential direction of the cross-wound bobbin in a travel time correlation method.

It is also known to determine the approximate weight of a cross-wound bobbin during its production by means of the yarn count and the length of the yarn produced. However, the problem here is that not only can the thread count of the feed bobbin, generally a bobbin produced on a ring spinning machine, be scattered, for example because errors occur during the spinning process on the ring spinning machine or because the used roving bobbins differ, but also because the length of the thread to be produced, which is determined, for example, by the number of revolutions of the cross-wound bobbin drive drum, is often inaccurate. That is, each revolution of the drum assumes a particular yarn production length. However, the specific yarn length produced may differ from the actual yarn length produced by the production-technical framework conditions, such as slippage and yarn tension, with the result that the weight advantage of the cross-wound bobbins produced fluctuates considerably.

Even with the use of a capacitive clearer that recognizes an undesirable weight deviation and clears it, the determination of the cross-wound bobbin weight from the yarn count and the yarn production length alone is highly inaccurate. It is known that when using such a capacitive clearer, a so-called error band, i.e. a range which tolerates deviations in the yarn quality, is first defined by the operator of the cross-winding automatic winder. Although the sum of the deviations in yarn quality occurring within the specified tolerance band can be compensated for by the yarn production length, within the tolerance band they also tend to evolve to be positive or negative, with the result that positive and negative evolution leads to a greater weight spread of the bobbins.

As already mentioned, the known devices or methods for forming cross-wound bobbins of the same yarn length or the same diameter have proven themselves in practice. However, no device or method is known with which the weight of a cross-wound bobbin can be determined precisely during the winding process. Accordingly, the instantaneous machine productivity of a textile machine which produces cross-wound bobbins, which is often always desirable on the side of textile machines which produce cross-wound bobbins, in particular cross-wound automatic winders, cannot be predicted precisely by the known devices or methods.

Disclosure of Invention

In view of the prior art, the present invention is based on the task of developing a method or a textile machine which allows an exact determination of the individual cross-wound bobbins during the winding of the cross-wound bobbins at the workstations of the textile machine which produces the cross-wound bobbins.

According to the invention, the object is achieved in that the yarn clearer successively, i.e. continuously, detects the yarn quality of the advancing yarn for determining the weight of the cross-wound bobbin, and the yarn quality values are determined, and the values added together over the entire yarn production length of the cross-wound bobbin are determined from the yarn detection of the yarn clearer for determining the weight of the cross-wound bobbin. The running thread is thus completely swept here. Thus, all the values obtained for the probe sweep or for the complete probe sweep yarn production length are incorporated into the sum.

The method according to the invention has the advantage that the formation of a cross-wound bobbin, the weight of which is always precisely known, can be ensured in a relatively simple manner, i.e. without using additional new, costly hardware. By accurately knowing the weight of the cross-wound bobbin being produced, an operator of a textile machine producing the cross-wound bobbin accurately knows the machine productivity of the associated textile machine producing the cross-wound bobbin. With the method of the present invention, the weight can be determined with the accuracy of the scale. So that weighing after the fact can be dispensed with.

Weight deviations between bobbins having the same length are generally undesirable. In accordance with a further development of the invention, it is proposed that the continuously determined weight of the cross-wound bobbin is monitored for deviations from an expected value and that weight deviations during the winding process are compensated for if there are undesirable deviations in the determined weight of the cross-wound bobbin. The desired value can be determined from the weight and the weight increase during the entire winding path of previously wound cross-wound bobbins of the same batch. In order to influence the weight of the cross-wound bobbin, for example, a minimum length can be set and the length of the yarn beyond it can be determined by the weight reached. If the textile machine which produces the cross-wound bobbins is a spinning machine, it is also conceivable to adjust the spinning parameters to compensate for the weight deviation.

The method can in principle be carried out with the aid of any clearer that detects diameter fluctuations. That is, not only the optical clearer but also the capacitive clearer may be used. However, the capacitive yarn clearer can determine the weight of the cross-wound bobbin in a very precise manner, since it directly detects the yarn fiber mass in the cross-section of the yarn. The probe sweep value is proportional to the yarn weight. One therefore obtains the yarn quality value directly. In the case of optical sensors, the yarn quality value can only be estimated indirectly from the diameter value. It is therefore proposed for the method according to the invention to use only a capacitive clearer in order to achieve the desired accuracy.

The clearer thus provides a yarn quality value for each production length. In order to determine the weight of the cross-wound bobbin, the yarn quality values over the entire production length of the cross-wound bobbin can be added together or can be integrated. However, yarn cleaners generally only measure changes. The weight of the bobbin is therefore preferably also determined from the deviation of the mass value of the yarn.

The yarn mass mean is preferably calculated at the start of a batch from a number of yarn mass values. All relative deviations of the individual yarn sweeps from the average value of the yarn quality are added with respect to the yarn production length during the entire winding stroke. I.e. a yarn mass integral is formed which, if not equal to 0, is used to form the correction factor. The correction factor is used to approximate the weight of the cross-wound bobbin produced at the workstation to the weight of the cross-wound bobbin calculated from the yarn count or average yarn quality and the length of the yarn produced. The determined production weight of the cross-wound bobbin is therefore calculated from the yarn count or yarn mass average, the production length and the correction factor. The calculation and evaluation can be carried out by means of a computing device of the textile machine.

In an advantageous embodiment, it is also provided that the length of all yarn defects removed as a result of an inadmissible deviation from the average value of the yarn quality is buffered and the buffered yarn defect length is used to correct the yarn quality score. In this way, it is ensured that only the yarn sweep values are taken into account in the formation of the correction factor, which lie within the permissible fluctuation range with respect to the average yarn quality, but the yarn sweep values which are removed as yarn defects during the winding stroke are not taken into account in the formation of the correction factor.

In addition, in an advantageous embodiment, it is provided that the value of the yarn mass integral is adjusted when the yarn mass mean value changes during production. In this case, the value of the yarn mass integral is also adjusted accordingly, if it is verified during the winding stroke that the initially determined yarn mass average has changed due to, for example, a slight change in the yarn count of the unwinding bobbin.

As is known per se in connection with the operation of a condenser clearer, the preparation agents (finishing agents) and the moisture content of the yarn are also taken into account in the determination of the yarn quality value in addition to the yarn fiber quality in the yarn cross section. That is, the moisture content of the yarn mass and any substances additionally adhering to the yarn mass are taken into account when determining the yarn mass value.

The invention also relates to a textile machine for producing cross-wound bobbins, for carrying out the method according to the invention, having a computing device and a plurality of workstations, each of which is provided with a winding device for depositing a yarn on a cross-wound bobbin and a capacitive yarn clearer arranged in the region of the yarn travel path, which yarn clearer clears undesired deviations in the yarn quality during the winding process. According to the invention, the yarn clearer is designed to successively scan the yarn quality of the continuous yarn and to forward the determined yarn quality values to the computing device, and the computing device is designed to determine values from the yarn scanning of the yarn clearer for determining the weight of the cross-wound bobbin, which values are added together over the yarn production length of the cross-wound bobbin.

In the textile machine according to the invention, for example, a central control unit of the textile machine producing cross-wound bobbins is used as a computing device. However, a workstation computer of a workstation of a textile machine that produces cross-wound bobbins may also be used as a computing device. That is to say that both the central control unit of the textile machine and the station computer of the textile machine stations can be modified in a relatively simple manner in terms of software, so that they perform all the required calculations reliably as required.

Drawings

Further details of the invention can be taken from the following examples described in connection with the figures, in which:

fig. 1 shows a side view of a workstation of a cross-wound automatic winder that uses the method according to the invention.

List of reference numerals

1 cross winding automatic bobbin winder

2 station

3 spinning bobbin

4 winding device

5 Cross-wound bobbin

6 bobbin and bobbin conveying system

7 cross-wound bobbin conveying device

8 bobbin creel

9 bobbin driving roller

10 yarn traversing device

11 conveying disc

12 pivot axis

13 guide yarn finger

14 drive device

15 unwinding position

16 yarn

17 suction nozzle

18 pincers bobbin

19 yarn splicing device

20 yarn tensioner

21 yarn cleaner

22 waxing device

23 yarn cutting device

24 spinning bobbin supply section

25 storage section

26 transverse conveying section

27 bobbin feedback section

28 station computer

29 bus connection mechanism

30 central control unit

31 yarn tension sensor

32-yarn-feeding sensor

33 measuring mechanism

Detailed Description

As is known, a cross-winding automatic winder 1 has a plurality of identical stations 2, here winding stations, between its (not shown) end frames. At these stations 2, as is also known and therefore not described, the spinning bobbins 3 produced on the ring spinning machine which is at the front during production and which have a relatively small amount of yarn material are rewound into large-package cross-wound bobbins 5 which, after their production, are transferred by means of a service unit which operates automatically (not shown), preferably by means of so-called cross-wound bobbin changers, to a cross-wound bobbin transport device 7 along the machine length and from there to a bobbin loading station or the like which is provided at the machine end. Such cross-wound automatic winders 1 also usually have a logistics device in the form of a bobbin and bobbin transport system 6, in which the spinning bobbins 3 or the empty bobbins after unwinding circulate on a transport tray 11. Fig. 1 shows only the spinning bobbin supply section 24, the reversibly drivable storage section 25, the transverse feed section 26 to the station 2 and the bobbin return section 27 of such a bobbin and bobbin transport system 6. The spinning bobbin 3 provided by the bobbin and bobbin transport system 6 is positioned in the unwinding position 15 (which is located in the region of the transverse transport section 26 at the station 2 in each case) and is rewound into a large package of cross-wound bobbins 5.

The individual stations 2 of the cross-winding automatic winder 1 are provided with various devices which ensure the orderly winding of the stations 2. One such device is, for example, a winding device 4, which, as is customary, has a creel 8 mounted for limited movement about a pivot axis 12, in which the cross-wound bobbin 5 is rotatably mounted. In the embodiment shown in fig. 1, the cross-wound bobbin 5 also bears with its surface against a bobbin drive roller 9 driven by an electric motor during the winding operation, which frictionally drives the cross-wound bobbin 5 during the winding operation.

In the region of the winding device 4, a thread traversing device 10 is also installed, which is used to wind the thread 16 onto the cross-wound bobbin 5 in a cross-layer manner during the winding process. In this exemplary embodiment, the thread traversing device 10 has a thread finger 13 which is connected to an electromechanical drive 14 and which, during the thread run, always traverses the thread 16 between the end sides of the cross-wound bobbin 5. The drive 14 of the thread traversing device 10, for example the motor of the thread drive roller 9, is connected via a control line to a station computer 28 of the station 2, which is itself connected via a bus connection 29 to a central control unit 30 of the cross-winding automatic winder 1.

In addition, the individual stations 2 are each equipped with a suction nozzle 17 and a nipper tube 18 and with various other yarn monitoring or yarn processing devices, which are also connected to the station computer 28 via corresponding control devices. Such stations 2 are provided, for example, with a respective pneumatically operated yarn joining device 19, by means of which the yarn end of an upper yarn is connected to the yarn end of a lower yarn, for example after a yarn break, as required.

The station 2 is also provided with a lower yarn sensor 32, a yarn tensioner 20, a capacitive clearer 21, a waxing device 22, a yarn cutting device 23, a yarn tension sensor 31 and a measuring device 33 for determining the length of the advancing yarn 16, respectively. The measuring device 33 is, for example, a device as described in DE4225842a1, i.e. a measuring device 33 in which the yarn speed is determined by means of a travel time correlator, which is directly evaluated by means of an integrator to determine the cumulative length of travel of the yarn 16 wound into the cross-wound bobbin 5 at the workstation 2. However, instead of using such a very accurate measuring device 33, the determination of the yarn production length can also be carried out in other ways. The determination of the thread production length can also be carried out, for example, by the number of revolutions of the bobbin drive roll 9, whereby a specific thread production length is assumed for each roll revolution. The values which can be determined by the known methods cannot always be very accurate, based on the production-technical framework conditions such as slippage, fluctuations in yarn tension.

The method has the following functions:

before the winding operation begins, for example after a batch change, some stations 2 of the cross-wound automatic winder 1 are first supplied with new unwinding bobbins, preferably with the bobbins 3 produced on the ring spinning machine, of new yarn batches.

This means that, by means of the bobbin and bobbin transport system 6, at least one bobbin 3 is initially inserted in each station 2 of the cross-wound automatic winder 1 and positioned in the region of the transverse transport section 26 of the station 2 at the unwinding position 15. Subsequently, the yarn end, which is ready, for example, at the bobbin tip of the spinning bobbin 3, is blown upward by a yarn end opener arranged in the region of the unwinding position 15 of the station 2 (not shown) and, with the aid of the nipper tube 18 and the suction nozzle 17, is directly fixed to a cross-wound bobbin rotatably mounted in the creel 8 or is fed into the working region of the yarn take-up of the cross-wound bobbin changer.

In this case, the thread take-up of the cross-wound bobbin changer then positions the thread 16 in the region of the creel 8 of the station 2, so that when the creel 8 is closed, the thread 16 is clamped between the foot of the cross-wound bobbin tube previously exchanged into the creel 8 by the cross-wound bobbin changer and the bobbin receiving disc of the creel 8. The thread 16 of the bobbin 3 of the new thread batch is thus fixed on the new cross-wound bobbin tube, so that a new winding process can be started at the relevant station 2.

According to the method of the invention, the capacitive clearer 21 determines a plurality of yarn quality values of the continuous yarn 16 drawn off from the spinning bobbins 3 one after the other at the start of a batch and transmits the yarn quality values to a computing device, for example a station computer 28 of the respective station 2 or a central control unit 30 of the cross-winding automatic winder 1. The

computing device

28 or 30 then calculates a yarn mass mean value from the yarn mass values. In determining the yarn mass value, the capacitive clearer 21 takes into account, in addition to the yarn fiber mass in the yarn cross-section, the preparation agent adhering to the fibers and the yarn moisture content, in each case in proportion to the yarn weight per unit production length.

Furthermore, the relative deviations of all individual yarn sweeps from the mean value of the yarn mass during the entire yarn run, i.e. over the entire production length of the yarn, are added together in the

computing device

28 or 30 and a yarn mass integral is formed therefrom. This means that the yarn mass integral is 0 if it is taken into account that the sum of the positive and negative yarn mass deviations is equal over the entire production time of the bobbin. However, when the sum of the positive and negative yarn quality deviations differs, a correction factor is obtained for the produced yarn weight. That is, the product weight calculated in the calculating

device

28 or 30 and the actual yarn weight of the cross-wound bobbin 5 produced at the respective station 2 of the cross-wound automatic winder 1 are relatively accurately approximated to each other by means of the correction factor. In this way, it is possible for the operator of the cross-winding automatic winder to be able to overview the exact throughput of the textile machine when processing a certain yarn batch.

As already mentioned, the removed yarn defect length is taken into account when determining the yarn quality integral, i.e. when creating an accurate yarn quality integral, the length of all yarn defects removed due to inadmissible deviations from the average value of the yarn quality is buffered and used to correct the yarn quality integral. The yarn mass integral value is also readjusted when the yarn mass mean value changes during the yarn stroke.

Claims

1. A method for determining the weight of a cross-wound bobbin (5) produced on a textile machine (1) having a plurality of workstations (2), each workstation (2) having a winding device (4) for depositing a yarn (16) on the cross-wound bobbin (5) and a capacitive yarn clearer (21) arranged in the region of the yarn path, the yarn clearer (21) removes an undesired deviation in the quality of the yarn (16) during the winding process, characterized in that the yarn clearer (21) successively detects the yarn quality of the yarn (16) in the sweeping motion and the yarn quality value is determined, in order to determine the weight of the cross-wound bobbin (5), the values added together in the yarn production length range of the cross-wound bobbin (5) are determined by the yarn cleaner (21) by detecting the yarn.

2. Method according to claim 1, characterized in that a yarn quality mean value is calculated from a plurality of yarn quality values at the start of a batch, the deviation of the individual yarn sweeps from the yarn quality mean value is determined during the entire winding stroke, the deviations are added together in relation to the yarn production length, and the weight of the cross-wound bobbin (5) is calculated from the sum of the deviations, the yarn count of the yarn (16) and the yarn production length.

3. Method according to claim 2, characterized in that a correction factor is determined from the deviation sum and the weight of the cross-wound bobbin (5) is calculated from the yarn count of the yarn (16), the yarn production length and the correction factor.

4. Method according to claim 2 or 3, characterized in that the length of all yarn faults cleared due to an inadmissible deviation from the average value of the yarn quality is buffered and taken into account for correcting the deviation sum.

5. Method according to any of claims 2 to 4, characterized in that the deviation sum is adjusted if the yarn quality average changes during production.

6. Method according to any one of the preceding claims, characterized in that the yarn fiber quality in the yarn cross-section, the moisture content of the yarn and the preparation agent are taken into account when determining the yarn quality value.

7. A textile machine (1) for producing cross-wound bobbins, the textile machine (1) being used for carrying out the method as claimed in one of claims 1 to 6, the textile machine (1) having a computing device (28,30) and a plurality of workstations (2), each workstation (2) being provided with a winding device (4) for laying a yarn (16) on a cross-wound bobbin (5) and a capacitively acting yarn clearer (21) arranged in the region of the yarn travel path, the clearer (21) clearing away an undesired mass deviation of the yarn (16) during the winding process, characterized in that the clearer (21) is designed for successively sweeping over the yarn mass of the running yarn (16) and transmitting the determined yarn mass value to the computing device (28,30), and the computing device (28,30) is designed for passing through the clearer in order to determine the weight of the cross-wound bobbin (5) (21) The yarn is scanned to determine the values which are added together over the entire yarn production length of the cross-wound bobbin (5).

8. The textile machine (1) for producing cross-wound bobbins as claimed in claim 7, characterized in that the computing device which processes the values determined by the capacitively acting yarn clearer (21) is a central control unit (30) of the textile machine (1).

9. The textile machine for producing cross-wound bobbins as claimed in claim 7, characterized in that the computing device which processes the values determined by the clearer (21) in a capacitive manner is a station computer (28) of the relevant station (2) of the textile machine (1).