DE19626962A1 - Winding thread on cylindrical crossover reel in incremental precision winding - comprising continual redn. of traversing speed between predetermined upper and lower limit in transient increments with predetermined winding ratio - Google Patents

Abstract

Winding thread on a cylindrical crossover reel in incremental precision winding comprises continual reduction of the traversing speed between a predetermined upper and lower limit (speed range) in many transient increments with a predetermined winding ratio or K-value (ratio of reel rotation speed to traversing frequency,) and then rising sharply to a higher traversing speed with another predetermined ratio. All the predetermined winding ratios for the course of each winding increment are evaluated and classified with regard to their danger of disturbing the formation of the reel and the traversing speed is sharply changed in accordance with one of the following criteria: It is increased before reaching the lower limit if this increase leads a) to an esp. suitable classified ratio for the course of the step and; b) to a ratio with a better classification than the current one. A variation of the method uses instead the following criteria: The traversing speed is increased a) when the lower limit is reached to a winding ratio optimally classified for the speed range and; b) before reaching the lower limit to a ratio with a better classification than the current one.

Description

The invention relates to a method for winding a Thread, especially a synthetic thread cylindrical cheese according to the preamble of claim 1.

When winding or winding such in particular synthetic threads encounter the problem of critical states the, especially of mirror formation, if this in wild winding can be wound up.

In the case of a wild winding, the coil build-up is constant Coil circumferential speed and with constant traverse dizziness. It follows that the winding ratio (K value), which is the ratio of the speed of the winding spin del represents the double stroke number of the traverse, in the course the winding travel decreases steadily. This is due to the fact that also the speed of the winding spindle with increasing winding diameter decreases. This creates mirrors if that Spool ratio becomes an integer or takes values that are around a large fraction of the next integer winding ratio differentiate. As a "big break" is a Fraction denotes, the denominator is a small integer (integer) is, e.g. B. 1/2, 1/3, 1/4.

DE-OS 23 19 282 describes a method for production a mirror disorder known. With this procedure the Set value of the traversing speed with a change low frequency and also a change with high Frequency superimposed. This is supposed to create mirrors be avoided.  

In the case of a precision winding, the coil is built up with a traversing speed, which is the speed of the spool spindle is directly proportional. This means that at the winding ratio of a precision winding is and remains constant during the winding cycle, while the traversing speed is proportional to the spindle speed decreases with the winding ratio as a proportionality factor. A coil built in precision winding can be compared a coil built in a wild winding have advantages. In particular, with a precision winding Specify the winding ratio to reduce mirror formation.

The so-called graduated precision winding or stages precision winding (SPW) differs from the precision Sionswicklung only in that the winding ratio only remains constant during specified phases of the winding cycle. From phase to phase, the winding ratio is in steps by abruptly increasing the traversing speed wrestles. That means that with step precision winding a precision winding within each phase or stage at which the traversing speed is proportional to the spindle speed decreases. After each phase the Traversing speed increases again suddenly, so that results in a lower winding ratio. The Bobbin ratios that are observed during the individual phases should be calculated and programmed in advance.

A winding process is known from DE 42 23 271 C1, in which a computer from level to level of a level precision winding determines the number of turns and it with compares dangerous mirror values. It is with the calculated number of turns worked if this is not in the critical range of a mirror value. If you however, is in the critical range, with a low added larger number of turns worked. That is, it  in the case of critical mirror values with so-called "number of turns close to the mirror" worked, which is a win display number, which is a mirror value distinguishes a defined small difference. Likewise is described that the installation distance to the distance from Thread center to thread center is taken, at least equal to the width and at most equal to three times the porridge te of the incoming thread. That means it will Thread thickness taken into account during the winding process.

EP 0 256 383 B1 describes a method for winding from chemical threads in particular to cylindrical packages straight front edges described. To avoid mirrors formation, the traversing speed is changed so that the maximum traversing speed is already at one Layer thickness is reached, which is less than 10% of the total th layer thickness of the coil. It is preferred aspired that the maximum traversing speed is not over 80% of the total layer thickness is retained.

EP 0 194 524 B1 describes a method for winding up of threads, especially chemical threads, in spinning and knitting seem described. This process uses the stages precision winding applied and an inaccuracy of Deliberately created winding ratio. It will be a module tion of the winding ratio in a certain modulation width realized at which the traversing speed a small defined amount regarding the calculated and programmed value of the changierge speed changes.

Furthermore, EP 0 055 849 B1 describes a method for winding yarns or tapes in increments Precision winding known, in which the change in Coil ratio from one level of precision winding to  next is so small that the resulting Change the winding speed of the yarn or Ribbon 3%, preferably 0.3%, of the middle winding roll speed does not exceed.

All methods known in the prior art are common sam that above all mirror formations of higher order or honeycomb formation cannot be completely avoided, d. H. especially rare mirrors are not taken into account can be, and therefore even with a step precision sions winding, as is known in the prior art, a general avoidance of mirror formation is not possible is.

It is therefore the object of the invention to provide a method for To create thread winding with which a bobbin with good drainage properties, d. H. essentially without Mirror itself of a higher order and of a rare kind and without Honeycombs can be produced reliably.

This task is accomplished by a method with the characteristics solved according to claim 1 or claim 2.

Thereafter, in particular, in the method of winding another a synthetic thread to form a cylindrical cross coil used a step precision winding, in which the traversing speed between a given upper limit and a lower limit (speed range) in a number of stages temporarily, possibly also under Be taking into account the thread width to avoid critical Conditions, especially mirror formation, during the winding trip is changed. The traversing speed is included a predetermined crossing ratio (ratio of the rotation number of cross-wound bobbin to the traversing frequency) diminishes and then jumps to a higher chan  yaw rate with a predetermined other intersection ratio increased. According to the invention, all for the course of the step precision winding predeterminable cross conditions regarding their dangerousness for a Coil build-up disruption assessed and classified.

In this embodiment, the traversing speed becomes fast abruptly changed according to one of the following criteria:

One criterion is that the traversing speed before the lower limit of the traversing speed is reached area is increased if this increase becomes an im Classification of the stage classified as particularly suitable Crossing ratio leads. Can also be "particularly suitable" a bad crossing in terms of coil construction ratio applies if there is no better one in the level is and this will only go through quickly, whereby one after the other with a fast run through several equally bad crossing conditions briefly in succession can be set until finally a regarding the Coil build again good crossover ratio is achieved. In general, however, there is a good cross at every stage relationship can be found, to which the Changierge speed can be increased.

A second criterion for the sudden change in the The traversing speed consists in the fact that this is before reaching Chen the lower limit is increased if this increase too an intersection ratio that leads to a better classification tion than the current crossing ratio. On certain crossing ratio, what about the coil construction can represent a good crossbreed ratio, as long as run through as possible. With a bad cross However, there is a possibility that mirror certain orders or honeycomb formation can occur. Around  Avoiding this becomes a bad crossover ratio do not go through unnecessarily long, but leave immediately, if a better or equally bad, but different Intersection ratio can be found.

Furthermore, the method according to the invention another embodiment, the traversing speed between a predetermined upper limit and one given lower limit, which is the speed range for represent the traversing speed in a variety of Steps temporarily with a predetermined crossing ratio continuously reduced and then abruptly down to maximum the upper limit with another predetermined Crossing ratio increased. Again, all for the Course of each stage of the stage precision winding can be specified Crossing relationships regarding their dangerousness for a fault in the coil structure is assessed and classified. All crossing ratios are according to the accuracy and the mechanics of the traversing device taking into account of the respective neighboring crossing relationships to the current intersection ratio relevant. With this execution Example, the traversing speed becomes leaping changed according to one of the following two criteria:

One criterion is that the traversing speed at Reaching the lower limit of one in the speed range optimally classified crossing ratio is increased. Of the The jump occurs from the lower limit of the speed range, but does not have to reach the upper limit leads. This has the advantage that actually as optimally classified crossing ratios can, whereby the coil structure improves.

A second criterion is that the changierge speed before reaching the lower limit on the upper  limit is increased if this increase becomes an intersection ratio leads to a better or equivalent class sification than the current crossing ratio. That means that the traversing speed is already ahead Reaching the lower limit, d. H. somewhere in speed range, to the upper limit of the traversing speed rich is increased as soon as a better crossing ratio is achievable. A better crossing ratio is one Intersection ratio, at which mirror or honeycomb or similar things can be avoided.

With all alternatives, the goal is, if possible only maintain good cross-breeding conditions. If in one Level is not a good crossing ratio for the next level can be found, in any case, that which is then approached poor crossing ratio only kept as short as possible will.

In one embodiment, throughout the upper and lower limits of the traversing speed The specified interval is close to each other K-values assessed with regard to the danger of a malfunction where the evaluated K-values are at least as close together different, like this due to the accuracy of the tax tion and the mechanics of the traversing device can be. Only the K values for the following winding section, which is approved as were rated favorably with regard to the coil structure.

Criteria are preferably used as evaluation criteria attracted at which all K values with regard to Spiegelnei inclination, honeycomb inclination and slippage. Here in particular, the thread width when placing on the Coil considered. Based on these evaluation criteria becomes a k-value table depending on at least  another thread parameter with which the Determination of the crossing ratio of the threads when laying down can be precisely determined on the package.

The parameters titer, Filament number and cross-section, tangling, twist, preparation, Ripple, thread / thread friction, total or selective combined considered.

In a preferred embodiment, the Assessment of the K values the directly adjacent K values considered. Are now in an approved jump Interval of the traversing speed only poor K values the permitted jump distance for this is determined Phase of the winding process increased.

In another preferred embodiment, it is if only bad K values are found in one step interval is also possible, which is a permissible jump distance in Subdividing small jumps in this phase is a must sufficient winding can only be realized for a short time and, if not possible otherwise, on another insufficient winding with another bad but still portable K value and another intersection to jump, too is then only briefly wound again.

The calculation accuracy for determining the K values lies preferably higher than the mechanical accuracy, in particular by a power of ten, the K values are preferably as close as one is corresponds to up to 4 decimal places (i.e. 10000 / per K unit).

Since in the step precision winding according to the invention very much K values lying closely next to each other throughout the whole winter  vall the traversing speed taking into account Thread parameters and taking into account immediately neighboring dangerous K values will be evaluated this type of step precision winding according to the invention referred to as intelligent step precision winding (ISPW). Further advantages and possible uses of the invention are now detailed in connection with the drawing explained.

Show it:

Fig. 1a, the dependency of the traversing frequency on the spool diameter for a simple step precision winding with a jump from the upper limit to almost the lower limit;

1b shows the dependence of the oscillating frequency from Spu lendurchmesser for intelligent Stufenprä zisionswicklung during a jump from the top border to the Changiergeschwindigkeitsbe rich.

FIG. 2a shows the dependence of the oscillating frequency from Spu lendurchmesser for easy Stufenpräzi sion winding during a jump from the lower limit to near the upper limit of the Changie rgeschwindigkeitsbereiches;

FIG. 2b shows the dependence of the oscillating frequency from Spu lendurchmesser for intelligent Stufenprä zisionswicklung during a jump from the lower limit in the traversing speed range;

Fig. 3 is a calculated K-value with mirror formation or honeycomb pattern; and

FIG. 4 shows a thread-laying image with the same parameters as in FIG. 2, but with a K value changed by 1 / 10,000.

Fig. 1a shows in a diagram of the traversing frequency f over the coil diameter d the principle of the normal stage precision winding. The crossover ratios (K values) each have a hyperbolic profile, since the speed of the cross-coil decreases with increasing coil diameter. According to FIG. 1a, the winding is initially carried out with a constant crossing ratio K1, so that the traversing frequency f follows the hyperbolic curve. Shortly before reaching the lower limit, the K value K1 jumps to the K value K2 after assessing the corresponding value of the K value, the value of the value K2 being better than the value of the value K2 _limit which would occur if the jump had occurred at the interval limit. The evaluation of the value shortly before reaching the lower limit only covers the closest neighboring values to the value K2 _limit at the interval limit.

The step precision winding according to the invention differs from the normal step precision winding in that either the optimization of the K2 values with regard to K2 <K2 _limit or K2 '<K2 is realized according to FIG. 1b of the figure labeled "1", or according to FIG. 1b the figure labeled "2" realizes a "choice of the lesser evil" in which K2 <K1. The operation symbol "<" refers to the corresponding weighting in accordance with the evaluation of the K values. By calculating all K values in the jump range from K1 to K2 _limits and assessing them depending on the thread parameters, the best K values can be obtained in successive intervals with the best assessment and compliance with the limit values within the permitted jump range and taking into account dangerous neighboring K values are found, and it is possible to avoid even rare mirrors, in particular of higher order, and honeycomb formation. Taking this assessment into account, a K-value table is thus created, and an optimized table can be determined by including the assessments of subsequent jumps, ie an iteratively holistically best table. In the process variant according to FIG. 1b, the jumps in the traversing speed take place in relation to the upper limit.

According to the invention, therefore, there is no winding close to the mirror. In addition, a calculation of the values with very high density made to ensure during the Winding process not to be built into a bad K-value fen. To do this, it is required (and will be according to the invention also considered) to clarify whether in the vicinity a K value determined as good is a dangerous K value lies, whereby the thread width is also taken into account. This prevents yourself from being as well determined K value, which in the neighborhood to a ge dangerous K value, the machine during the winding process due to minor adjustments in an otherwise, based on the good K value, unexpected mirror is running.

Fig. 2a shows the dependence of the traversing frequency f on the coil diameter d in the case of a simple step precision winding. In the step precision winding known per se, a jump is realized which begins after reaching the lower limit of the traversing speed range from this lower limit and is led up to close to the upper limit of this traversing speed range. The jump in the traversing speed is realized when the crossing ratio K2 is better in value than a K _limit , this being realized in the vicinity of the interval limit.

Fig. 2b shows in an analogous manner to Fig. 1b the intelligent step precision winding in the event that a jump from the lower limit of the traversing speed range to a good K value, based on the quality of the winding winding, so that the jump from the lower limit to the traversing speed range, but not to the vicinity of the upper limit. According to FIG. 2b, FIG. 1, after reaching the lower limit again, a small jump can be carried out, which leads to a K value which is better than the K2 _limit value. As is achieved by not unnecessarily jumping to a value of the crossing ratio, which u. U. is worse than the K value, which is close to the K2 _limit value. According to Fig. 2b, Fig. 2, it is further possible with the inventive method of this embodiment that a jump from the lower limit of the traversing speed range to a good K-value in the sense of the coil structure takes place, the jump being realized in the traversing speed range and with a constant K-value, it only lingers until an even better K-value can be achieved. In order to achieve this even better K-value, the original K-value is left by increasing the traversing speed by leaps and bounds. This increase can be carried out up to the upper limit of the chaning speed range. However, the jump can also be carried out so that it starts before the lower limit is reached and is not carried out until the upper limit is reached.

The general context of a level precision winding is known to be based on a number of crossing ratios nits, which are gradually wound up over the winding trip will. The need for generation or installation an intersection table or K-value table can be seen from the general context.

D _coil × tan α × K = const.

where α is the crossing angle and K is the winding ratio, which is also called an intersection ratio. This means that at a given crossing angle the K value has to adjust with increasing coil diameter. In a conventional step precision winding method let the K value for small changes in diameter Coil of up to 2% constant, for example, and takes one slight change of α in purchase, then corrected by Use of a smaller percentage K value, so as to return to an original crossing angle to return. As is known, the K value is now ver responsible for how the threads are distributed over the bobbin.

Unfavorable K values cause the threads to overlap for example in a certain regularity and not to be distributed over the outer surface of the bobbin. As a result, so-called mirrors and honeycombs arise (see FIG. 3). Fig. 3 illustrates an example in which the stroke was 120, was the yarn width of 0.4 mm, as a K- value was 3.0312 at 584 deposited filaments. It is obvious that for a given K-ratio, ie crossing ratio, wider threads than the threads assumed to be 0.4 mm wide for the production of FIG. 3 can completely cover a bobbin area before they again lie exactly one above the other. In the case of narrow threads or threads which have been used with a smaller thread width than that for generating the image on which FIG. 3 is based, the difference in the thread width becomes even smaller and the honeycombs can be larger. Another unfavorable effect that can occur is that Kreuzungsver ratios can arise in which the threads lie close together over a wide area without crossing. This leads to poor bobbin cohesion, which can lead to slipping layers of yarn, which is disadvantageous especially when unwinding at high speeds.

Fig. 4 shows a filing image which is completely different from that shown in Fig. 3, although the parameters which have been chosen are the same, with the only difference that the K value is only in the fourth digit after the decimal point, was changed by 1 / 10,000. This underlines the great influence that the correct selection of the K value and its neighboring values has on the quality of the wound coil. Based on the relatively good K-value of 3.0311, as was taken as a basis in FIG. 4, the K-value of 3.0312 according to FIG. 3 represents a dangerous K-value. This can lead to the fact that if possible, the good K value should be maintained over a short period of time, or should not be used, since even a very small change can immediately lead to mirror formation.

In order to obtain an overall optimized K-value table, further provided according to the invention that the evaluators the K values of subsequent ones Jumps into the assessment basis for the table flow in, so iteratively the best time all the time generate table. After such a generation optimized table it is still possible that within the permissible jump distance is not sufficient in places there is a good crossing. Then according to the procedure  e.g. B. he permissible jump distance for this one place increases. However, it is also possible that in such a Drop the jump distance into small jumps at this point is divided, so bad K values only for a short time drive, d. H. insufficient intersection for a short time wrap, and then briefly on another poor K value, d. H. another also insufficient Jump intersection. This way it is possible to Presence of poor K values, i. H. bad cross tongues, by driving through them briefly with your To minimize the influence on mirror formation that a mirror formation does not occur, which in the Game winding would be to drive through. One more way if there are bad K values, the Leave precision winding and on wild winding with Mirror disorder until the next possible reasonably good one Switch K value.

The tables are created depending on Thread parameters, especially the thread width. However can also have numerous other parameters such as Titer, Fila number and cross-section, tangling, swirl, preparation, Crimp, thread / thread friction u. a. in the creation of the Tables are included. This can be done offline altogether on a computer or online during the product changeover on the winding machine through the computer of the machines control can be realized. As part of this setting it is also possible for areas of assessment Specify thread widths, for example, a window from To get ± 20% for which the created K-value table is permissible. The thread parameters listed can be their influence on the creation of evaluation criteria weighted for the dangerousness of the K value, ins considered as a whole or selectively combined be done.

Claims (11)

1. A method for winding a thread to a cylindrical bobbin in step precision winding, in which the traversing speed between a predetermined upper limit and a predetermined lower limit (speed range) in a number of stages temporarily with a predetermined crossing ratio (ratio of the speed of the bobbin to the traversing frequency ) continuously reduced and then suddenly increased to a higher traversing speed with another predetermined crossing ratio,
characterized in that
All intersection ratios that can be specified for the course of each stage of the stages of precision winding are assessed and classified with regard to their danger of a disturbance in the coil structure, and that the traversing speed is changed suddenly according to one of the criteria:

• a) the traversing speed is increased before reaching the lower limit if this increase leads to a crossing ratio classified as particularly suitable in the course of the step; and
• b) the traversing speed is increased before reaching the lower limit if this increase leads to an intersection ratio which has a better classification than the current intersection ratio.

2. A method for winding a thread to a cylindrical bobbin in step precision winding, in which the traversing speed between a predetermined upper limit and a predetermined lower limit (speed range) in a number of stages temporarily with a predetermined crossing ratio (ratio of the speed of the bobbin to the traversing frequency ) continuously reduced and then suddenly increased to a higher traversing speed with another predetermined crossing ratio,
characterized in that
All intersection ratios that can be specified for the course of each stage of the stages of precision winding are assessed and classified with regard to their danger of a disturbance in the coil structure
and
that the traversing speed is changed suddenly according to one of the criteria:

• a) the traversing speed is increased when the lower limit is reached to an optimally classified crossing ratio in the speed range; and
• b) the traversing speed is increased to the upper limit before the lower limit is reached, if this increase leads to an intersection ratio which has a better classification than the current intersection ratio.

3. The method according to claim 1, characterized in that the traversing speed increased to the upper limit becomes. 4. The method according to claim 1, 2 or 3, characterized in that

• a) In the entire interval specified by the upper limit and the lower limit of the traversing speed, closely spaced K values are assessed with regard to the danger of a malfunction, the assessed K values being at least as close to one another as they are due to the accuracy the control and mechanics of the traversing device can be observed; and
• b) only the K-values for the following winding section are approved, which were rated as favorable with regard to the coil build-up.

5. The method according to any one of claims 1 to 4, characterized in that all K values with regard to mirror inclination, honeycomb inclination and the tendency to slip. 6. The method according to claim 5, characterized in that a K value table depending on at least another thread parameter is set up. 7. The method according to claim 6, characterized in that the parameters thread width, titer, Filament number, filament cross-section, tangling, twist, Preparation, crimping, thread / thread friction overall or combined in a selective manner. 8. The method according to any one of claims 1 to 7, characterized in that when evaluating the K values, the neighboring ones dangerous K values are taken into account.   9. The method according to any one of claims 1 to 8, characterized in that if only bad are found K values in the jump interval of the traversing speed the permissible jump distance for this one position of the Winding process is increased. 10. The method according to any one of claims 1 to 9, characterized in that when only bad K values are determined in the jump interval

• a) the permitted jump distance is divided into small jumps at this point in the winding process;
• b) a winding with a poor K value is only wound for a short time; and then
• c) a short jump is made to a winding with a different bad K-value and possibly another crossing.

11. The method according to any one of claims 1 to 10, characterized in that the density of the evaluated K values is higher than that Accuracy of control and mechanics of the chan yaw device of those working with the method Winding machine is, in particular at least ten times so tall.