EP1536046A2 - Warping process - Google Patents

Abstract

In a sheer separation process to prepare a textile warp a number of belts are wound separately onto a rotating sheer drum, each formed by a number of threads that are simultaneously removed by a creel. During removal process each belt is thickness is split in two. A master section is created in one belt and a winding pattern is detected, which value regulates the winding pattern in the master section. The master section is that part of the first belt closest to the interior. The increase in thickness of the sections is regulated by a pressure drum. If the increase in thickness is inadequate the pressure drum is relaxed.

Description

The invention relates to a warping method for producing a chain with several tapes in succession wrapped the circumference of a rotating warping drum each of which is covered by a plurality of threads is formed, which simultaneously deducted from a gate become.

A chain used to make textile sheet materials is usually a big one Number of threads that lie parallel to each other. It is practically impossible with reasonable effort, a number of threads corresponding to this number of threads To keep coils in a gate. Divided therefore, the chain in a series of ribbons and wraps the tapes one after the other. One must accordingly only have as many coils in a gate as Threads are to be wound in a tape.

The individual bands should be one another as much as possible have appropriate structure. It is therefore common that form the first band as a master band, whose winding course is monitored and stored, and the following Then drive belts so that the winding course in These bands follow the course of the master band. Although this method has largely been used in practice enforced. Nevertheless, it can be observed that it sometimes significant thread tension differences of Band to band gives. This leads to an uneven Building a chain.

The invention is based on the object as possible to achieve uniform construction of a chain.

This object is in a Schärverfahren the beginning mentioned type solved by the fact that the bands divided into at least two sections in the thickness direction, creates a master section in a band, determined a winding course in the master section and the winding process in the following sections accordingly the winding course in the master section controls.

With this configuration you do not just copy individual Ribbons from a master band. It is already equalized the structure of a band in itself. Every band will divided into "floors", which in the following referred to as "diamond" be because such a floor at a Cone warping machine in cross-section the shape of a rhombus Has. One defines such a floor, ie a section in the thickness direction, as master diamond, in the Principle of thickness increase and the number of turns be related. Ideally, should to give yourself a straight line. You can do this ideal state also emulate the fact that the order height on Determined at the beginning and at the end of the master rhombus and then forms a linear function of the turns. With others Words a straight line is defined, which is the winding structure replicates. In the rhombus following the master rhombus (Copy diamonds) This straight line is constantly being driven off. This achieves that already within a band the thickness build-up is much smoother than this was the case so far. But if already within a band of thickness increase is more uniform, then is also the voltage difference between neighboring ones Bands lower, i. You get a chain with a relatively uniform construction.

Preferably, the radial section is selected as the master section innermost section of the first volume. In other words, the master rhombus lies on the foot the cone of the warping drum when using a cone warping machine. If you're right at the beginning of the wrapping process set the master diamond, then you can all following rhombuses, so the following rhombuses of the first Bandes and all diamonds of the following bands, so wikkeln, that their winding course the winding course of the master rhombus essentially follows.

Preferably, a press roll is used to increase the thickness of the dikk to control the sections. This has changed especially when winding the master diamond as advantageous proved. When the master rhombus is the radially farthest inside rhombus of the first volume is, then it is wound from thread sections, which in the Supply spools in the gate are outside and therefore in usually are provided with a lower voltage. In this case, there is a risk that the thickness increase at the master rhombus is relatively large, so that he no longer reproduced without problems from the following rhombuses can be. If you, however, a press roll used, then you can increase the thickness with the help limit the press roll, so that in the subsequent diamonds the corresponding increase in thickness achieved without problems can be.

Preferably, it is reduced if the increase in thickness is too small a line load generated by the press roll. At the episode rhombuses or episode sections that out Thread sections are wound out further inside lying areas of the supply spools, have the threads a greater tension and thus a little lower Volume. This reduced volume causes that the thickness increase may be in the individual diamonds not as big as in the master rhombus. This effect can be reduced by a reduction counteract the line load. In other words it can be provided that the line load of the press roll, i.e. the force per length when winding the master diamond is greatest. However, this is not mandatory. In suitable Cases can also be the master rhombus with a Wind load, which is not the maximum Line load corresponds.

Preferably used as a start-line load for a section the final line load of the previous one Section. It is assumed that the line load primarily of the state of the current gewikkelten Thread section depends. This condition changes but between the end of a rhombus, i. the End of a section, and the beginning of the next rhombus or the next section is not. The control process So it is greatly simplified, if you have the Maintain line load when changing a section can.

Preferably, a thread tension control is used, to control the increase in thickness of a section. A thread tension control can be done centrally at the gate, from which the threads are deducted. If determines that the increase in thickness of a rhombus or a section is too big, then you can this growth rate decrease by adjusting the thread tension elevated. At an increased thread tension is reduces the volume of the threads. This results in a less increase in thickness.

It is preferred that in the master section without Thread tension control wraps. In the master section Use only the press roll to the Dikkenzuwachs to control. This has the advantage of being in the following sections or diamonds a larger number of ways to influence the increase in thickness.

It is also an advantage if you want to grow too much in one section increases the thread tension and with too little increase in thickness in a section reduces the line load of the press roll. you So uses different measures to get into specific Situations too fast a growth on the one hand and too slow an increase in thickness on the other hand to compensate.

Preferably, it is lowered after an increase in the thread tension First, the thread tension, before you reduces the line load of the press roll. You drive So with a predetermined thread tension. If the Thickness increase is too large, then you increase the thread tension, until the thickness increase again the desired Value has, the thickness of the diamond per thread layer so by one certain value increases. If you realize then that you went too far in the regulation and the Thickness increase is too small, then first the thread tension lowered again until the increase in thickness again corresponds to the given course. This lowering takes place until the thread tension returns has assumed its original value. Only if this measure is not yet to the desired Success has led to the line load of the press roll reduced.

Preferably, you wrap all within a band Sections except for the radially outer section the same thickness. The radially outer portion can Although a reduced thickness compared to the other sections, especially the master section. His winding course, however, corresponds to this Dikke the winding course of the master section, i. of the Master diamond.

Fig. 1

eine schematische Darstellung einer Schärvorrichtung mit Schärtrommel und Gatter,

Fig. 2

einen schematischen Querschnitt durch einen Ausschnitt aus einer Schärtrommel mit aufgewickelter Kette,

Fig. 3

einen Wickelverlauf für eine Master-Raute und

Fig. 4

ein Beispieldiagramm zur Darstellung einzelner Regeleingriffe.

The invention will be described below with reference to a preferred embodiment in conjunction with the drawings. Herein show:

Fig. 1

a schematic representation of a warping device with warping drum and gate,

Fig. 2

a schematic cross section through a section of a warping drum with wound chain,

Fig. 3

a winding course for a master rhombus and

Fig. 4

an example diagram for the representation of individual control interventions.

Fig. 1 shows a warping device 1 with a warping drum 2, which has a cone 3. The warping drum 2 is driven by a drive, not shown, so she can turn while winding.

In a gate 4 is a plurality of coils 5. Of each spool 5, a thread 6 is withdrawn and fed via a Riet 7 of the warping drum 2. Between the coil 5 and the reed 7 is a central Voltage regulating device 8 for the threads 6.

Shown are in the gate 4 for reasons of clarity only a few coils 5. A real gate will of course have a lot more coils 5, so that also wound much more threads 6 at the same time can be.

Since the number of coils 5 and thus the number of the Available threads 6 is usually insufficient to a chain with a desired width too wrap, you create the chain from a variety of Ribbons 10-12. Each volume contains 10-12 in the present Embodiment the same threads. So everyone has Ribbons 10-12 also the same width. additionally one would like to achieve that all bands 10-12 substantially be wound with the same winding course.

To influence the voltage curve in the bands 10-12 is next to the voltage regulator mentioned above 8, a press roll 13 is provided which under the Effect of a pressure device 14 on the outermost Location of the last wound tape 12 rests. The Pressing device 14 generates a force 15 on the tape 12. This contact pressure 15 divided by the width of the Band 12 gives a line load. This line load affects the increase in thickness of the tape 12, i. she is one of the criteria by which measure the Diameter of itself on the circumference of the warping drum. 2 forming coil 16 at each revolution of the warping drum 2 enlarged. The diameter is indicated by an in Fig. 1 sensor 9 shown schematically continuously detected.

It is known so far, the first volume 10 as a master band to wrap and the winding process during winding to capture. The following bands 11, 12 are then called Copy of the master tape 10 generated.

However, this approach does not always lead to satisfactory Results. Especially if you when winding a chain new coils 5 used results in the first band 10, i. the band, the cone 3 is applied, a relatively non-uniform winding course.

To even this winding process and thus to even the winding course in the entire chain, is now provided that you every band divided into "floors", which in the following referred to as diamond become. The name rhombus results from this, that due to the cone 3 each "floor" in cross section has the shape of a rhombus.

One now chooses the first rhombus of the first band 10, i.e. the radially innermost diamond, as Master diamond 18 off. This master diamond 18 is over a predetermined order height 19 defined when they reach then the number of turns is stored. The order level can be determined, for example, by that over yarn parameters and order data one theoretical band application height 20 determined. This one will then by a given number of diamonds per band divided. As a result, the diamond application height can be calculated. As the previous estimate of the theoretical Tape application height 20 does not always match reality can it happen that the last rhomb 21? has a reduced diamond application height.

Upon reaching the order height 19 of the master diamond 18 is determined by the order height 19 and the number of turns defines a straight line, for example, in Fig. 3 can be seen. An order height 19 corresponds then a number of turns n. One number of turns nz should then correspond to a lower order height HNz.

So as soon as the master diamond 18 wrapped and the context between the number of turns and the order height 19 has been determined, the first consecutive 22 are wound. This is a copy diamond in which the increase in thickness of the relationship shown in Fig. 3 must suffice.

This achieves a more homogeneous winding structure within a ribbon. Should the last diamond 21 of the Bandes will not be complete, so start at the beginning of next band 11 anyway a new diamond 23, whose Winding course again the context shown in Fig. 3 is traced.

To influence the thickness increase, there is now the options described above, namely the Influenced by the press roll 13 and the other the influence of the thread tensioning device 8th.

When winding the master diamond 18 is only the press roll 13 is used. The press roll 13 is with used a line load, the maximum contact pressure equivalent. In some cases, however, it can be low, the contact pressure when winding the master diamond 18 to reduce a reserve, so that in a later stage of winding the possibility has to increase the line load. When winding the master diamond 18 so waived the regulation of Thread tension. This is set at the beginning of the winding and then stays unchanged.

The line load of the press roll 13 is at the beginning of winding and then remains unchanged. However, the press roll 13 is only from a preset Order level switched on, as they do not open the empty warping drum 2 should run.

The press roll 13 prevents the increase in thickness at the master diamond 18 is too big. This can be in observe many cases and in particular, if you have new coils 5 when winding the master rhombus used. Namely, the master diamond 18 will turn off Wrapped sections of threads 6, which under a diminished Have been suspense and therefore under Circumstances are somewhat more voluminous than thread sections, which were wound inside the coils 5. From these inner thread sections could be found in copy diamonds 21-23 may no longer have the same thickness increase to reach.

If you have ensured with the help of the press roll 13, that the increase in thickness when winding the master diamond 18th remains within certain limits, then you can see that when winding copy or sequential rhombuses 21, 22, 23, the line load from the press roll 13 on the winding 16 is exercised, possibly reduced, in but usually will not increase. This should be based on Fig. 4 will be explained. Fig. 4 shows the turns n is a curve 24 representing the line load, a curve 25, which represents the thread tension, and a Curve 26, which shows the deviation between the in Fig. 3 shown straight line and the actual thickness increase a rhombus 21-23 represents.

The line load (curve 24) and the thread tension (Curve 25) are at the beginning of the winding process, such as mentioned above, kept constant. If at this Constellation exposes that the thickness increase to small fails (deviation 27), then you reduce first the line load (curve 24) for so long until no deviation between the in Fig. 3rd shown straight line and the increase in thickness of the individual Rhombus yields. This situation is at a point 28 occurred. However, now results in a faster Thickness increase of a sequence diamond 21-23, than this by the curve of Fig. 3 is predetermined (deviation 29). In In this case, the thread tension (curve 25) is increased, so that the increase in thickness decreases again and at a Point 30 again reaches the setpoint curve. Accordingly the thread tension is reduced again so that can reduce the maximum 29 again. Only when then a further decrease in the increase in thickness results (Section 31), the line load (curve 24) becomes again diminished to increase the thickness increase of the rhombus again to bring the desired size.

In other words, too little increase in thickness a lozenge reduces the pressing force of the press roll 13. If the increase in thickness is too large, the pressing force not increased, but the thread tension increased. But you can also provide the option, the Press roll 13 with an increased line load on the Wrap 16 to work.

Since the line load of the press roll 13 only within certain Borders may be varied, one is at the Copy diamonds 21-23, if due to a different Order level these limits would have to be exceeded, the thread tension control 8 is used. This is true, however not for the master rhombus 18. Here is the Thickness increase exclusively influenced by the press roll 13.

Start Line Load for Copy Diamonds 21-23 is always the End-line load of the previous rhombus. this applies even with a band change, i. the final line load the press roll 13 on the last diamond 21 of the first Bandes 10 corresponds to the starting line load of the press roll 13 on the first rhombus 23 of the second band 11th

For bobbin change or other manual corrections But it is also possible, the start-pressing force and the Thread tension control on the master diamond settings reset.

To overclock or swing up the scheme too avoid, a software PID controller is used at the first copy diamond 22 by an autotuning method optimally adjusted. The normally time-dependent components of the control behavior (I, D) should here to be a dependency on speed to avoid being related to the way traveled.

Claims (10)

A warping method for producing a warp in which a plurality of tapes are successively wound on the circumference of a rotating warper drum, each formed by a plurality of threads simultaneously pulled from a gate, characterized in that the tapes are stretched in the direction of thickness subdivides at least two sections, generates a master section in a band, determines a winding course in the master section and controls the winding process in the following sections according to the winding course in the master section. A method according to claim 1, characterized in that one selects the radially innermost portion of the first band as the master section. Method according to claim 1 or 2, characterized in that a press roll is used to control the increase in thickness of the sections. Method according to Claim 3, characterized in that , if the increase in thickness is too small, a line load generated by the press roll is reduced. Method according to Claim 3 or 4, characterized in that the starting line load for a section is the end line load of the preceding section. Method according to one of claims 3 to 5, characterized in that a thread tension control is used to control the increase in thickness of a section. A method according to claim 6, characterized in that winding in the master section without thread tension control. A method according to claim 6 or 7, characterized in that one increases the thread tension at a too large increase in thickness in a section and reduced at a small increase in thickness in a section, the line load of the press roll. A method according to claim 8, characterized in that , after an increase in the thread tension, the thread tension is lowered first before the line load of the press roll is reduced. Method according to one of Claims 1 to 9, characterized in that , within a band, all the sections are wound with the same thickness except for the radially outer section.

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