WO2020182980A1

WO2020182980A1 - Method for controlling a plurality of winding devices, and a textile machine

Info

Publication number: WO2020182980A1
Application number: PCT/EP2020/056805
Authority: WO
Inventors: Dieter Haak; Jürgen STRÖWER
Original assignee: Oerlikon Textile Gmbh & Co. Kg
Priority date: 2019-03-14
Filing date: 2020-03-13
Publication date: 2020-09-17

Abstract

The invention relates to a method for controlling a plurality of winding devices (10) in a textile machine, and to a textile machine. In each of the winding devices (10), a thread is wound to form a thread package (11), wherein the thread is guided over a package width of the thread package (11) by a thread guide (14) driven in oscillation. The thread guide (14) is driven by an electric motor (15) and a belt drive (16) in such a way that the thread guide (14) executes a multiplicity of traversing strokes within the package width. According to the invention, the electric motors (15) for driving the thread guides (14) in the winding devices (10) are each controlled, on the basis of different belt tensions of the belt drives (16) in the winding devices (10), with a drive torque suitable for the belt drive (16) in question. To this end, each electric motor (15) within the winding devices is assigned a separate pilot control unit (19).

Description

Method for controlling a plurality of winding devices and a textile machine

The invention relates to a method for controlling a plurality of Spuleinrichtun conditions in a textile machine according to the preamble of claim 1 and a textile machine according to the preamble of claim 8.

In the production, treatment and further processing of threads, it is common for the threads to be wound up into bobbins at the end of the process. Here, the thread is guided back and forth within a bobbin width by means of a traversing thread guide so that the thread can be wound into a cheese. The drive of the traversing thread guide is preferably carried out in an oscillating manner, so that the thread guide is guided back and forth within a traversing stroke. In order to obtain the fastest possible reversal of the traversing thread guide in the stroke ends, it is driven by an electric motor which is coupled to the traversing thread guide via a belt drive. Such a textile machine is known, for example, from DE 10 2010 031 705 A1.

In the known textile machine, the winding devices are arranged in a machine frame alternately in layers one above the other and next to one another within the floor in order to wind up a large number of threads after texturing into thread bobbins. A driven traversing thread guide is provided in each of the winding devices, which is driven in an oscillating manner via a belt drive and an electric motor. The winding device has a control device which controls the speed of the Chan yaw thread guide within a traversing stroke.

A period of time that the traversing thread guide needs to run through a traversing stroke is taken into account in order to obtain the most accurate possible positioning of the traversing thread guide when winding the bobbin. In this respect, attempts are made in the known textile machine to produce as possible Fa denspulen with a uniform density via the speed control. The electrical parameters are essentially recorded and used in order to influence the winding of the filament spool.

In principle, further methods for controlling a winding device are known in the prior art, in which, in particular, the stroke movement of the traversing thread guide is as precisely as possible in terms of both speed and stroke length. are feasible. For example, DE 199 50 285 A1 reveals a method in which the reversal points of the traversing thread guide are recorded and compared with setpoints. Here, the stroke length or the end position of the traversing thread guide can be used to maintain the structure of the thread bobbin with threads laid as precisely as possible in a stroke reversal. Here, too, only the electrical parameters and sizes are taken into account in order to recurrently produce uniform thread spools within one of the Spulein directions.

In practice, however, it has been shown that the thread bobbins wound simultaneously in several winding devices have different bobbin widths. Even with identically specified target values and identical control methods, there were different winding widths in the thread bobbins.

It is therefore the object of the invention to provide a method for controlling a plurality of winding devices in a textile machine and a textile machine of the generic type, in which thread bobbins with the same bobbin width as possible can be generated in adjacent winding devices.

This object is achieved according to the invention in that the electric motors for driving the traversing thread guides in the winding devices are each controlled with a drive torque that is adapted to the belt drive in question.

For the textile machine, the solution according to the invention results from the fact that each of the winding devices has a pilot control device connected to the electric motor, by means of which the respective electric motor can be controlled with a drive torque adapted to the assigned belt drive.

Advantageous developments of the invention are defined by the features and feature combinations of the respective subclaims.

The invention is based on the fact that the mechanical coupling between the electric motor and the traversing thread guide also influences the guidance of the traversing thread guide. It was observed that the belt tension of the belt drive directly influences the length of the traversing stroke. Too high a belt tension led to a shortening of the traversing stroke and too low a belt tension to a lengthening of the traversing stroke. In this respect, each of the winding devices has a mechanical load torque that has to be provided by the electric motors. By the inventive method and the textile machine according to the invention can advantageously compensate for such tolerances in the mechanics. In this respect, the electric motors for driving the traversing thread guides in the winding devices are each controlled with a drive torque adapted to the belt drive concerned. For this purpose, each of the winding devices has a pilot control device connected to the electric motor, by means of which the respective electric motor can be controlled with a drive torque adapted to the associated belt drive.

In order to be able to control a drive torque on the electric motor that corresponds as much as possible to the load torque, the method variant is particularly advantageous in which an actual target value comparison of the traversing strokes is carried out in each winding device at least at the start of the process and in which the traversing strokes are made from difference values at the end a winding cycle a correction value of the chan yaw strokes is determined and in which, depending on the correction value of the traversing strokes, the preset drive torque of the electric motor of the winding device concerned is changed in the subsequent winding cycle. By increasing or decreasing the drive torque, an adaptation to the existing load torque of the drive train can be carried out automatically at the start of the process. In each winding device, the electric motors for driving the traversing thread guides can thus be adapted to the individual tolerances of the mechanics.

In order to obtain an adaptation of the drive torque as quickly as possible, the correction value is preferably determined from an average difference of the traversing strokes according to an advantageous variant of the method. In this way, the actual / target deviations determined per traversing stroke can be added up over the entire winding cycle in order to then form an average value of the difference. This mean difference value can then be used to determine the correction value of the traversing strokes. Alternatively, however, there is also the possibility of using a maximum differential value of the traversing strokes that occurs during a winding cycle. The winding cycle determines the length of time in which a thread package is completely wound within the winding device.

In order to ensure that a first change in the drive torque of the electric motor brings the desired improvement, the further method variant is preferably used, in which at the end of the subsequent winding cycle in the relevant the winding device the correction value of the traversing strokes is determined again and at which the drive torque of the electric motor is changed again as a function of the correction value.

This process can advantageously be carried out after each winding cycle of the winding device concerned until the correction value of the traversing strokes has reached a tolerance range. This means that the yarn guides in the winding devices can be driven electrically under the same conditions. The drive torques of the electric motors are matched to the respective actual states of the load torques of the drive transmission.

In order to be able to wind uniform thread bobbins on each of the winding devices, the tolerance range of the correction value of the traversing strokes is specified for the winding devices for winding the thread bobbins. The tolerance range of the correction value of the traversing strokes is selected in such a way that the possible small deviations between the drive torque and the load torque are safely compensated for by the control and regulation of the electrical parameters.

So that each of the winding devices can start at the beginning of the process under identical target specifications, it is also provided that when the process starts, the electric motors of the winding devices for driving the traversing thread guides are controlled with a predetermined target drive torque. In this respect, a pre-control of the electric motors is carried out identically at the beginning of the process.

By means of the pilot control device assigned to the electric motors, the preset pilot control currents which are fed to the electric motors in order to maintain a setpoint drive torque are preferably controlled and changed. Each of the electric motors of the winding devices can be operated with an individual pilot current feed.

In order to obtain a pre-control of the electric motor that is coordinated for the mechanics, the textile machine is preferably designed in such a way that the control devices of the winding devices are designed in such a way that an actual / target comparison of the traversing strokes can be carried out at least at the start of the process At the end of a winding cycle can be transferred to a correction value of the traversing strokes and that the correction value of the traversing strokes can not be generated for the assigned pilot control device. This ensures that the electric motors are controlled with an individual pre-control depending on the actual / target deviations of the traversing strokes.

The method according to the invention for controlling a plurality of winding devices in a textile machine and the textile machine according to the invention are therefore particularly suitable for winding identical thread spools in a plurality of winding devices. The different tolerances in the drive trains of the traversing thread guides with a large number of winding devices can be compensated individually by an adapted pilot control and thus by an adapted drive torque of the electric motor. Each of the winding devices adjusts itself automatically to a drive train optimized for the laying of the thread.

The method according to the invention for controlling a plurality of Spuleinrichtun conditions is explained in more detail below using an exemplary embodiment of the textile machine according to the invention with reference to the accompanying figures.

They represent:

Fig. 1 schematically shows a cross-sectional view of a textile machine according to the invention

Fig. 2.1 and

2.2 schematically shows several views of a winding device of the textile machine according to FIG. 1

3 schematically shows a plurality of thread trays at the end of a thread spool

In FIG. 1, an exemplary embodiment of the textile machine according to the invention is shown schematically in a cross-sectional view. The exemplary embodiment of the textile machine has a plurality of processing stations in order to texturize a plurality of threads. In the cross-sectional view, the thread path of one of the processing points is shown schematically, the adjacent processing points being arranged next to one another along a longitudinal side of the machine. Each of the processing stations is assigned a presentation station 3 which is arranged in a gate 2. The gate 2 here contains several presentation stations 3 for several processing stations. A supply reel 3.1 and a reserve reel 3.2 are provided within the supply station 3. A thread 21 is pulled from the supply bobbin 3.1 and textured in the processing point.

For this purpose, several delivery mechanisms 4.1, 4.2, 4.3 and 4.4 are arranged in a machine frame 1 to form a thread run. A Heizein direction 5, a cooling device 6 and a friction unit 7 is arranged between the delivery mechanisms 4.1 and 4.2. This aggregate 5, 6 and 7 form a so-called texturing zone in which the thread 21 is crimped.

A swirl device 8 is seen between the delivery mechanisms 4.2 and 4.3. A set heating device 9 is arranged between the delivery mechanisms 4.3 and 4.4 in order to be able to carry out a thermal post-treatment on the thread, in particular a shrink treatment.

The delivery mechanism 4.4 is followed by a winding device 10 in which the thread 21 is wound into a thread bobbin 11. In the machine frame 1, a plurality of Spuleinrich lines 10 are arranged in levels one above the other, since the width of a winding device 10 is greater than the width of the upstream units in the thread run. To this extent, for example, three delivery mechanisms 4.1 are arranged on the machine frame 1 within the width of one of the winding devices 10.

The winding devices 10 are designed identically and each have a swiveling bobbin holder 10.1, a drive roller 10.2 and a thread laying device 10.3 in order to wind the thread bobbin 11. The thread spool 11 is driven by the drive roller 10.2. The bobbin holder 10.1 is preferably fork-shaped and holds a Spulhül se between two clamping plates, not shown here, on the circumference of which the thread bobbin 11 is wound. Here, the thread is guided back and forth through the thread-laying device 10.3 within a bobbin width in order to produce a cross winding on the bobbin 11.

In Figs. 2.1 and 2.2 one of the winding devices 10 is shown schematically in several views. Fig. 2.1 shows a front view and in Fig. 2.2 a Seitenan view of the winding device 10 is shown. The following description applies to both figures. In FIGS. 2.1 and 2.2, of the winding device 10, only the thread-laying device 10.3 and the thread bobbin 11 wound on the winding tube 20 are shown. So the incoming thread 21 is guided back and forth by a traversing thread guide 14 within a Spulenbrei te. The traversing thread guide 14 is coupled ge to a belt drive 16, which is driven by an electric motor 15 to oscillate. The belt drive 16 consists of a drive wheel 16.1 and a plurality of drive wheels 16.3, which are wrapped by an endless belt 16.2. The drive wheel 16.1 is directly connected to the electric motor 15. The traversing thread guide 14 is guided within a sliding guide 16.4 by the belt 16.2. For exact positioning and movement of the traversing thread guide 14, the electric motor 15 has an incremental encoder 17 which determines the rotation of a drive shaft. In the embodiment shown here, the incremental encoder 17 is placed directly on a drive shaft of the electric motor 15. Alternatively, the incremental encoder 17 can be coupled to the drive shaft of the electric motor 15, for example via a gear or a similar mechanical connection.

As can be seen from the illustration in FIG. 2.2, the incremental encoder 17 is connected to a control device 18.

The electric motor 15 is assigned a pilot control device 19 which is connected to the control device 18. The electric motor 15 is connected to a motor controller 22 which is assigned to the control device 18.

To wind a thread in one of the processing stations, the winding device 10 is wound the thread on the circumference of the winding tube 20 to form the thread bobbin 11. The Fa denspule 11 and the winding tube 20 are driven by the drive roller 10.2 with a constant peripheral speed. To lay the thread 21 within the winding width of the thread bobbin 11, the traversing thread guide 14 is driven in an oscillating manner by the belt drive 16 and the electric motor 15. So the Chan yaw thread guide 14 carries out a large number of traversing strokes within the bobbin width of the bobbin 11. When the process starts, an identical setpoint is given to the electric motor 15 on each of the winding devices 10 of the textile machine. Thus, via the pilot control device 19, a pilot current is fed to the electric motor 15 in such a way that the electric motor 15 drives the belt drive 16 in an oscillating manner with a setpoint drive torque. The length of the traversing stroke is also defined via a target specification of angle increments so that the traversing denführer 14 executes identical traversing strokes in each winding device 10. At the traversing stroke ends, however, it is necessary for the traversing thread guide 14 to reverse, so that the electric motor decelerates and accelerates

15 must be carried out. The reversal of the traversing thread guide 14 and thereby the depositing of the thread 21 is largely determined by the drive torque of the electric motor 15 and the opposing load torque of the belt drive

16 influenced. It was found that the belt tension of the belt 16.2 alone drove 16 into the belt, influencing the placement of the thread 21 during the reversal at one end of the thread spool. For this purpose, in Fig. 3 an embodiment of meh rerer thread trays at different belt tensions of the belt drive 16 is shown schematically.

In Fig. 3, a front end of the bobbin 11 is shown, with three under different thread trays 23.1, 23.2 and 23.3 are shown, which were generated with different chen belt tensions of the belt drive 16 in several winding devices 10. In a first deposit 23.1, the thread is shortened ver in the thread reversal to a desired width of the thread bobbin 1 1 stored. The difference to the nominal width of the thread bobbin is marked with the lower case letter a. The thread deposit 23.1 could have been produced with a winding device in which the belt drive 16 has a relatively high load torque due to an excessive belt tension. In contrast, a further thread deposit 23.3 is shown, in which the Spulein direction 10 would produce a thread bobbin 11, which goes beyond the nominal width of the thread coil 11. The enlarged coil width is marked with the lowercase letter b. This winding device 10 could aufwei sen a belt drive 16, which contains, for example, a relatively low belt tension.

Only in the event that the drive torque of the electric motor 15 and the mechanical tolerances of the belt drive 16 for driving the traversing thread guide 14 are matched, a desired thread deposit occurs in the Umkehrbe rich, which corresponds to a nominal width of the thread bobbin 11. This thread deposit 23.2 is shown in the middle area in FIG.

In order to produce the desired bobbins 1 1 with the nominal width in each winding device 10 of the textile machine, an actual / nominal comparison of the traversing strokes is carried out at the start of the process in a first winding cycle. The information for this is fed to the control device 18 via the incremental encoder 17. So let yourself be each traversing stroke of the traversing thread guide 14 determine the deviations between a target value specification and an actual value. The determined difference values te of the traversing strokes are recorded continuously during the winding of the bobbin 11 and added up at the end of the winding cycle. The sum of the difference values is then averaged and calculated to give an average difference value. This mean difference value from the actual / target comparison of the traversing strokes is then converted to a correction value which leads to a change in the precontrol of the electric motor 15. The correction value can thus be converted within the control device 18 to a control signal which is fed to the pilot control device 19. The pilot control device 19 changes the pilot control, for example, by increasing or reducing the pilot control current to the electric motor 15. The electric motor 15 is then operated with a changed drive torque during a subsequent winding cycle. The drive torque is adapted to the load torque, it being possible to increase or decrease the drive torque compared to a setpoint drive torque. So all winding device 10 in the textile machine can be adapted to the respective drive conditions for driving the traversing thread guide 14. Each of the electric motors of the winding devices 10 can thus be operated with an individual pre-control which can deviate from the setpoint value preset given at the start of the process.

In a subsequent winding cycle, the changed drive torque of the electric motor 15 is checked, in which an actual / target evaluation of the traversing strokes takes place again. Thus, at the end of the subsequent winding cycle, a correction value can be determined again in order to change the precontrol of the electric motor 15. However, if the correction value is within a specified tolerance range, the feedforward control is retained unchanged. The subsequent winding cycles of the winding device 10 then take place with the selected setting of the precontrol of the electric motor 15.

Overlaid there is an electrical control of the electric motor 15 via the motor controller 22, as is known, for example, from WO 15/078763 A1. In this respect, reference is made to the cited publication and no further explanations are given.

The machine in the method according to the invention and the textile machine according to the invention thus have the particular advantage that with a large number of spooling devices lines each of the winding device is able to perform a self-correction, in particular to compensate for the tolerances resulting from the mechanics of the drive. In this way, very even bobbins can be wound in all winding devices. However, other events that can be detected by the incremental encoder on the motor shaft and have an influence on the coil width offset can be advantageously recognized by the invention and, if necessary, corrected. B. with egg nem replacement motor with slightly different characteristics.

Claims

1. A method for controlling a plurality of winding devices in a textile machine, in which each of the winding devices winds a thread to form a thread spool, the thread being guided by an oscillatingly driven traversing thread guide within a bobbin width of the thread bobbin, and the traversing thread guide being driven by an electric motor and a belt drive is driven in such a way that the traversing thread guide executes a plurality of traversing strokes within the bobbin width, characterized in that the electric motors for driving the traversing thread guides in the winding devices are controlled with a drive torque adapted to the respective belt drive.

2. The method according to claim 1, characterized in that an actual target value comparison of the traversing strokes is carried out in each of the spooling devices at least at the start of the process and that a correction value of the traversing strokes is determined from differential values of the traversing strokes at the end of a winding cycle and that in Depending on the correction value of the traversing strokes, the pre-set drive torque of the electric motor of the relevant Spulein direction is changed in the subsequent winding cycle.

3. The method according to claim 2, characterized in that the correction value of the traversing strokes is determined from a mean differential value of the traversing strokes or from a maximum differential value of the traversing strokes.

4. The method according to claim 2 or 3, characterized in that at the end of the subsequent winding cycle in the relevant winding device, the correction value of the traversing strokes is determined again and that the drive torque of the electric motor is changed again as a function of the correction value.

5. The method according to any one of claims 2 to 4, characterized in that after each winding cycle of the winding device in question, the correction value is determined, the drive torque of the electric motor being changed until the correction value of the traversing strokes has reached a tolerance range.

6. The method according to claim 5, characterized in that the tolerance range of the correction value of the traversing strokes is given to the winding devices for winding the thread bobbins.

7. The method according to any one of claims 1 to 6, characterized in that when the process starts, the electric motors of the winding devices for driving the traversing thread guides are controlled with a predetermined setpoint torque.

8. Textile machine with a plurality of winding devices (10) for winding thread bobbins (1 1), each of the winding devices (10) having a traversing thread guide (14), one with the traversing thread guide, for guiding the threads

(14) coupled belt drive (16) and one with the belt drive (16) gekop pelten electric motor (15) and wherein the electric motors (15) are assigned several control devices (18), characterized in that each of the winding devices (10) with a the electric motor (15) connected before control device (19), through which the respective electric motor

(15) can be controlled with a drive torque adapted to the assigned belt drive (16).

9. Textile machine according to Claim 8, characterized in that a preset pilot current can be changed by each of the pilot control devices (19) in the winding devices (10) on each of the electric motors (15).

10. Textile machine according to claim 8 or 9, characterized in that the control devices (18) of the winding devices (10) are designed such that an actual target value comparison of the yawing strokes of the traversing thread guide (14) can be carried out at least at the start of the process that determined difference values of the traversing strokes at the end of a winding cycle can be converted to a correction value of the traversing strokes and that a control command for the assigned pilot control device (19) can be generated by the correction value of the traversing strokes.