JPH0372545B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the prevention of ribbon winding (Bild) or (Spiegel) (also referred to as ribbon winding prevention) in the winding of yarn in coarse pitch winding.

When winding a thread onto a bobbin, the thread is reciprocated across its direction of travel over a predetermined distance (stroke) that substantially corresponds to the length of the bobbin. This reciprocating movement of the thread is referred to as traverse movement or simply traverse. The characteristic quantity of the traverse speed is the number of reciprocating strokes. Here, the number of reciprocating strokes is expressed as the sum of two successive strokes, that is, the sum of the forward motion and the return or return motion, and the number of reciprocating strokes is the number of reciprocating strokes per unit time. Spindle rotation speed and number of reciprocating strokes per unit time
12. For example, the spindle and the traversing drive are connected via a transmission and therefore have a certain mutual dependence, which results in a precise traverse winding.

On the other hand, the present invention is generally applicable to all types of thread winding (coarse pitch twill winding, coarse pitch winding) in which the rotational speed of the spindle does not depend in a fixed relationship on the number of reciprocating strokes, and in particular to DIN (West German Industrial Standard) 61801 relates to twill winding, which has a certain relationship between the number of reciprocating strokes and the circumference of the bobbin. Coarse pitch twill winding in the narrow sense of DIN 61801 is carried out in particular in the winding of chemical fiber yarns obtained at a constant high speed after spinning or yarn processing. Here, the circumferential speed of the bobbin can be determined either by tangential drive (driving with drive rolls that are driven at a constant speed and abut against the periphery of the bobbin) or by measuring and controlling the circumferential speed of the bobbin. be done. The traverse speed, i.e. the number of reciprocating strokes, is either constant (DIN 61801) or varies slightly, rather than in a fixed ratio to the rotational speed of the spindle. As a result, during the thread winding or thread bobbin forming process (winding process),
The winding factor, the ratio of the spindle speed to the traverse speed, decreases hyperbolically with increasing thread bobbin diameter. In coarse pitch winding in the sense of the present invention, there is a risk that "coincident winding" or "ribbon winding" (hereinafter referred to as "ribbon winding") will occur in the bobbin running area.

In this ribbon winding region, the yarn portions of several successive turn layers directly overlap. As a result, there is a risk, inter alia, of thread sections that overlap one another slipping laterally and twisting into each other. Ribbon winding therefore has an adverse effect on the yarn pay-out characteristics from the yarn bobbin and may cause yarn breakage or even render the yarn bobbin unusable. Ribbon winding also results in an asymmetry with respect to the center and axis of the thread bobbin, and therefore also in the stiffness, winding density and mass distribution of the thread bobbin, and, when using drive rolls, an asymmetrical contact force. , causing vibrations in the winding process and damaging the susceptible yarn material.

Ribbon winding occurs in a bobbin running region where the winding coefficient, the quotient of the rotation speed of the spindle and the number of reciprocating strokes, is an integer. Mixed (partial) ribbon winding occurs when the winding factor deviates from an integral winding factor value by a fractional value, in particular 1/2 or 1/3. In this mixed ribbon winding, multiple layers with thread sections that overlap one another and layers consisting of thread sections wound regularly, that is, next to each other, are formed one after the other.
Therefore, in mixed ribbon winding, the thread pay-off characteristics of the thread bobbin are not so adversely affected. On the contrary, there is a risk that the thread bobbin will become angular or asymmetrical, making the thread bobbin more susceptible to damage.

The winding factor at which ribbon winding or mixed ribbon winding occurs is hereinafter referred to both as ribbon winding occurrence value or ribbon winding occurrence winding coefficient value (Spiegelwert). Ribbon wraps with large ribbon wrap occurrence values are referred to as higher order ribbon wraps. It is known to achieve ribbon winding prevention by continuously varying the number of reciprocating strokes within narrow predetermined limits, periodically or non-periodically. In this case, when the winding factor approaches a certain ribbon winding occurrence value, especially an integer ribbon winding occurrence value, this ribbon winding occurrence value will inevitably be passed through multiple times with a certain duration. . Therefore,
Ribbon wrap prevention as described above merely eliminates or mitigates the symptoms of each ribbon wrap, rather than eliminating ribbon wrap occurrences from being passed through (e.g., U.S. Pat. No. 3,235,191;
(See Swiss Patent No. 416406).

Furthermore, when the winding coefficient approaches the ribbon winding generation value, the traverse speed, that is, the number of reciprocating strokes, is temporarily reduced, and when the winding coefficient exits the ribbon winding area, it increases to the original value again, thereby preventing ribbon winding. It is known that (West German Patent Application Publication No. 2914924
(see specification).

The present invention aims at improving these known methods in order to ensure that their aims as mentioned above are realized.

This object is achieved by providing an appropriate safety interval for each ribbon winding occurrence and assigning a specific jump height to each safety interval, as set forth in claim 1. . Jump height is here understood to be a change in the winding factor caused by a change in the traverse speed.

The appropriate safety distance is the minimum safety distance, which will be defined in more detail below. Prima facie, this minimum safe distance is the minimum allowable distance between the winding factor and the adjacent ribbon winding occurrence value or mixed ribbon winding occurrence value (the winding coefficient value at which ribbon winding or mixed ribbon winding occurs). It's the difference. This minimum safety distance must be maintained for the winding factor resulting from the starting value of the traverse speed as well as for the winding factor resulting from the blocking value of the traverse speed. This minimum safety distance can be predetermined to different magnitudes, but is preferably the same magnitude for one ribbon wrap occurrence. When the winding factor reaches or approaches this minimum safe distance from the ribbon winding occurrence value, a switch in traverse speed occurs, thereby changing the winding factor. According to the invention, it is proposed to carry out the switching of the traverse speed in such a way that a jump in the winding factor occurs. The magnitude of this take-up factor is such that the changed take-up factor lies outside the safe area. The safe region is defined here as the region of the winding factor that does not include the minimum safe distance from the ribbon winding occurrence value or the mixed ribbon winding occurrence value on either its positive or negative side. This means that the jump height of the winding factor is at least equal to twice the minimum safety distance. The method according to the invention is based on the following recognition. That is, the risk of ribbon winding symptoms occurring also occurs within a certain interval before and after each ribbon winding occurrence value, and moreover, the jump height caused by the change in ribbon winding order and traverse speed, that is, the jump height of the winding coefficient. It starts from the recognition that it depends on changes in

According to the invention, it is not necessary to limit the predetermined safety distance to a minimum safety distance. Rather, a larger safety distance can be predetermined. Even in this case, in order to quickly pass through the safety zone, the jump height of the winding factor caused by the change in traverse speed should be equal to twice the predetermined safety distance or larger. It is. In the present invention, the safety interval of the winding coefficient when approaching the ribbon winding occurrence value is
It is represented by S1, and the safety interval of the winding coefficient after switching the traverse speed is represented by S2. These two safety distances can both be the same, but both safety distances must be greater than or equal to the minimum safety distance.

The safety distance and the minimum safety distance are, in this case, the ribbon winding value to be avoided or the instantaneous measurement of the spindle speed and the traverse speed (number of reciprocating strokes).
is defined as a predetermined fractional value p of the winding factor given as the quotient of p. The practical difference lies solely in the required configuration of the electronic control device, and suitable measures can be envisaged in each case by those skilled in the art. However, the difference in safety distance caused by the calculation method disclosed herein is very small and can be ignored from the perspective of spinning technology.

Preferably, the fractional value p is constant over a plurality of successive ribbon wrap occurrence values. However, experience has shown that, especially for low-order ribbon wraps, the ribbon wrap symptom occurs relatively quickly before reaching the ribbon wrap occurrence value, so the value p may be varied in such cases. . Depending on the order magnitude, p is less than 5% and generally greater than 0.1%. The fractional value p can be determined experimentally or alternatively from spinning data during the winding process, as will be explained in detail later. In this case, the minimum safe distance is
During bobbin travel, the winding factor must never be less than (and must not be exceeded) as it approaches the ribbon winding occurrence value or the mixed ribbon winding occurrence value.
This is a safe distance. In this case, the risk of ribbon winding is relatively large, and the signs of ribbon winding are less likely to appear than when the winding coefficient moves away from the ribbon wind occurrence value or the mixed ribbon wind occurrence value in forward bobbin travel. It is from.

The safety distance S and the minimum safety distance can be determined empirically, as already mentioned. Alternatively or in addition, according to the invention, the safety distance S is defined as the minimum permissible thread spacing between adjacent threads of two successive turns, measured between thread centers on the generatrix of the bobbin, and the ribbon winding occurrence value. It is proposed to choose it to be proportional to and inversely proportional to twice one stroke (round trip).

Let us now consider the order of ribbon winding, especially the properties of the thread. Depending on the tessellation and the number of filaments, the thread wound on the bobbin is forced out in a direction transverse to its axis. Therefore,
In order to avoid ribbon-wrapping symptoms, it is necessary that the adjacent threads of two successive turns maintain a minimum distance from each other so as not to give rise to ribbon-wrap phenomena. This spacing is determined experimentally. However, this amount also depends on the properties of the thread, in particular the thread taitles, the number of filaments, the filament taitels, the composition of the filaments, e.g. knot formation, tangles, preparations,
It can be calculated with good accuracy based on the winding tension and the like.

Furthermore, according to the teaching of the present invention, the safety distance must be correspondingly increased as the bobbin length becomes shorter, for the following reasons. That is, as the bobbin length becomes smaller, the number of reciprocating strokes becomes relatively larger. Particularly harmful low-order ribbon wraps therefore occur. This ribbon winding is sometimes distributed unevenly on the bobbin due to the small bobbin length, resulting in an asymmetrical mass distribution with respect to the axial and/or radial direction of the thread wound on the bobbin. This is because, if the thread speed is high, the bobbin may be destroyed. Such a phenomenon is avoided according to the invention by making the safety distance inversely proportional to the bobbin length. As can be seen, the factor p indicated in connection with claim 1 corresponds to the quantity A/2H mentioned here.

Instead of the thread spacing A, the width B of the bobbin-wound thread, measured with respect to the generatrix of the bobbin, may also be used, in which case the winding angle is taken into account. In this case the coefficient p will be equal to B/2H. If the minimum safety distance determined in this way is exceeded in a decreasing direction, this is an indication of ribbon winding occurring.

By predetermining the safety interval as described above, according to the invention, the change in traverse speed is also predetermined. The reason is that, according to the invention, the changes in the take-up factor caused by changes in the safety distance and jump height, i.e. the traverse speed, are correlated with each other, so that the ratio Q=jump height/safety distance or Q = jump height/minimum safe distance is at least 2
Not only can it be equal to and predetermined constant for a plurality of ribbon windings, but also the jump height is at least equal to the sum of the predetermined safety distance and the minimum safety distance. This dependence of the jump height on the safety distance and the minimum safety distance is unique and effective in avoiding ribbon winding symptoms.

In order to avoid the appearance of deleterious ribbon winding symptoms when the winding coefficient passes through the ribbon winding occurrence value or the mixed ribbon winding occurrence value, the traverse speed and therefore also the change in winding coefficient should be made as quickly as possible, i.e. as much as possible. It is suggested that this be done in a leap forward manner. For this purpose, the drive parameters of the traverse drive (in the case of DE-OS2914924=Bag 114), the voltage and, if an asynchronous motor is used, the frequency, which are important factors for the traverse speed, are technically As much as possible, it is changed by a jumping function, preferably by superimposing the feature components. That is, it is proposed to initially increase the speed to a value greater than the setpoint value (and vice versa) and then switch to the setpoint value after a certain period of time. Nevertheless, it is unavoidable that the traverse drive enters the rotational speed determined by the changed drive parameters with a delay. Therefore, the winding coefficient can only be changed with a finite acceleration or deceleration. In this case, in addition to the technical impossibility of infinitely large accelerations or decelerations and the limitations of constant accelerations or decelerations, there is an initial high constant and then decreasing acceleration or deceleration (1 a change function with the following delay) and
There is a technical distinction to be made between increasing and decreasing the traverse speed with acceleration and deceleration that initially increases to a maximum value and then decreases again (variation function with first-order or higher-order delays).

As can be seen, the ratio Q can be increased if the varying winding factor passes through the region of ribbon winding occurrence values with accelerations or decelerations that are small enough to cause harmful ribbon winding symptoms.
In particular, this ratio Q is determined when the change in traverse speed and therefore in the take-up factor is carried out with an acceleration that is initially large and then decreases, i.e. as a function of the change in traverse speed or take-up factor with a first-order lag. Used in cases. On the other hand, it is also possible to choose the safety distance S to be larger than the minimum safety distance S' and to make the jump height equal to the safety distance plus the minimum safety distance. This occurs when the acceleration or deceleration of the traverse speed and therefore also the winding factor increases steadily from an initially zero or small value to a maximum value, i.e. the traverse speed or winding factor has a second or higher order lag. can be taken into account, for example, when transmitting varying traverse speeds with a slipping clutch.

Furthermore, according to the invention, the change function of the winding factor, which is determined from the technological change process of the traverse speed, is such that the changing winding factor passes through the ribbon winding occurrence value within a minimum time. The safety interval and the jump height of the winding coefficient are predetermined and matched with each other so that the safety area from the ribbon winding occurrence value + safety interval S1 to the ribbon winding occurrence value - safety interval S2 intersects in the area of maximum steepness or slope. It is suggested that

The blocking value of the traverse speed is maintained only for a certain period of time. A changeover of the traverse speed from the blocking value to the starting value and the resulting variation in the winding factor is determined by the safety interval between the ribbon winding onset value and the winding factor (this is determined by the spindle speed and the traverse speed), which is to be avoided. This occurs when the spindle speed has decreased so much that the starting value (determined from the quotient with the starting winding factor) is again obtained.

To avoid ribbon wrap occurrence values, the traverse speed can be increased or decreased from its starting value NCA. Traverse speed blocking value NCS
It is therefore either greater or less than the starting value NCA. In any case, the initial value and the stopping value should preferably remain constant over the entire bobbin run, at least over a significant part of the bobbin run, especially if several spinning stations share a common traverse drive. This is true if you have.

As the traverse speed decreases from the most recent ribbon winding occurrence value when the winding factor falls within the safety interval, the winding coefficient increases accordingly and is initially prevented from reaching the ribbon winding onset value.
However, if the spindle speed decreases so much that the take-up factor determined from the blocked value of the traverse speed (blocked take-up factor) reaches a predetermined safety interval, the traverse speed is increased again to its starting value. , so that the winding factor must be reduced again to pass through the ribbon winding occurrence value. It is important that this process occur within the shortest possible time. According to the invention, this can be achieved by abruptly changing the drive parameters, which are important factors determining the traverse speed, or alternatively by increasing the ratio Q (=jump height of the winding factor/safety distance) by 2. This is achieved by selecting a larger safety distance or by making the selected safety distance S larger than the minimum safety distance and making the jump height at least equal to the selected safety distance plus the minimum safety distance.

As long as the ratio Q is greater than 2, and if no emphasis is placed on passing through the ribbon winding generation value as fast as possible, the described switching can be carried out early, however, even if the starting winding factor is This can be done when the spindle rotational speed has decreased enough to reach a predetermined safety interval with respect to the ribbon winding occurrence value. As long as the ratio Q is greater than 2 and the traverse speed is increased with a quadratic or higher order delay, the switching will occur again until the starting winding factor reaches the predetermined minimum safe interval for the ribbon winding occurrence value. This must be done when the spindle rotational speed has decreased to a level equal to or greater than that.

If the traverse speed is increased when the winding factor is within the safe interval for the ribbon winding occurrence value,
The winding factor is thereby reduced. In this case, the ribbon wrap occurrence value is quickly passed through. This is achieved according to the invention as follows.
That is, when increasing the traverse speed with a first-order delay, the safety interval is predetermined to be as small as possible, ie smaller than the minimum safety interval, while the ratio Q is selected to be greater than 2. In this way, the ribbon winding safety area will be passed through with a large acceleration.

If the traverse speed is to be increased by a quadratic or higher order delay, a safety interval greater than the minimum safety interval is predetermined, and a jump essentially equal to the safety interval plus the minimum safety interval is predetermined. I'll keep it. In this way, the ribbon-wrapping safety area will be traversed with maximum acceleration. Such a rapid passage through the ribbon winding region applies in particular in particularly dangerous ribbon windings smaller than 4.

In both cases, the increased blocking value of the traverse speed is maintained until the spindle speed is reduced to such an extent that the starting winding factor again reaches the safe distance for the ribbon winding occurrence value. The magnitude of this delay in traverse speed is limited for technical reasons, so that the switching can take place earlier or later.

If the traverse speed is increased for the purpose of preventing ribbon winding, adverse effects on the bobbin structure can be avoided and concerns about this can be reduced. If the traverse speed is increased, the actual winding stroke of thread winding onto the bobbin is reduced. The risk of the thread slipping out of the end face of the bobbin due to excessively large strokes is thus avoided. Therefore, this type of ribbon winding prevention is superior.

The starting value NCA of the traverse speed is determined by the desired bobbin structure and in particular by the desired winding angle. For example, when winding polished spun yarn made of chemical fibers onto a bobbin using a spinning machine or a stretching machine, the traverse winding angle is 5 degrees to 12 degrees, especially 6 degrees to 9 degrees.
in the range of degrees. A particularly important factor here is the quality of the bobbin construction. The traverse speed, expressed in terms of the number of reciprocating strokes, is then determined from a predetermined yarn speed and a predetermined bobbin length or stroke length.

In that case, the change DC in the traverse speed is within the scope of the invention between 0.1% and 5%, preferably between 1% and 5%, of the previously determined starting value (initial value) NCA of the traverse speed. exist. Within this limit range, the change in traverse speed DC is
In this case, the yarn speed is selected so that it does not change by more than 0.1% by changing the traverse speed, and in the case of filament processed synthetic fibers it does not change by more than 0.5%. In this way, changes in the winding speed (=yarn speed) caused by changes in the traverse speed can be compensated for by appropriately changing the circumferential speed of the bobbin, that is, the drive roll speed so as not to cause ribbon winding. There will be no need. In addition, changes in traverse speed can be achieved by switching the traverse speed to a blocking value,
By maintaining the inhibition value over a period of time, the adjacent ribbon winding occurrence value or the mixed ribbon winding occurrence value having a detrimental effect or its safety area is limited by not being reached. .

The teachings of the present invention disclosed above relate to avoiding ribbon winding symptoms in successive series of ribbon windings and mixed ribbon windings. Relatedly and in addition to this, the present invention is also based on the recognition that not all ribbon roll occurrence values are necessarily harmful ribbon roll symptoms. This is true for high order ribbon windings that occur early in the bobbin run when the bobbin diameter is small so that the spindle speed can be changed very quickly. Furthermore, not all ribbon windings necessarily have a harmful effect, but there are only a few mixed ribbon windings that have a particularly harmful effect.
On the other hand, it is also certain that there are ribbon-wrap occurrences that are passed without exhibiting ribbon-wrap symptoms. For this reason, it is proposed to make the value of the occurrence of ribbon winding to be prevented or avoided freely programmable. In this way, it is possible to adapt the ribbon winding prevention according to the invention to the individual bobbin winding process parameters (bobbin speed, traverse speed, yarn material, preparation, etc. parameters). The advantage thereby is that irregular changes in the traverse speed that are often associated with changes in the traverse speed and the resulting negative effects on the bobbin structure are avoided.

The invention further proceeds from the recognition that ribbon winding symptoms can vary from ribbon winding to ribbon winding. It is therefore proposed that the safety distance be predetermined as a function of the ribbon winding occurrence value to be prevented and preferably freely programmable. In this case, it may be expedient to make the safety spacing of mixed or partial ribbon wraps smaller than the safety spacing of a whole number of ribbon wraps. As already mentioned, in this way the ribbon winding occurrence value and its safe area are quickly passed. This is particularly expedient for revolving occurrence values of less than 4.

It is also advantageous for the ratio Q=jump height/safety distance to be predetermined as a function of the ribbon winding occurrence value to be prevented, and preferably to be freely programmable.
In this way, ribbon occurrence values exhibiting particularly pronounced and harmful symptoms are passed through more quickly than other ribbon occurrence values. For low order ribbon windings, especially ribbon winding occurrence values smaller than 6, it is suggested to choose the ratio Q greater than 2.

The above-mentioned means for controlling S and Q can be combined, and the above-mentioned quantities S and Q can be adjusted in such a way that the variation of the traverse speed during the bobbin running process remains as predetermined. can be combined.

It is also possible to program a set inhibition value for the traverse speed. It should be remembered here that the safety distance in the sense of the invention can be freely determined for each ribbon winding. This safety interval depends on the ribbon winding occurrence value according to the equation S=FSP·p. This applies in particular if the factor p is constant and predetermined for all ribbon turns or for a group of ribbon turns. If p is predetermined as a constant in this way, then p can be calculated as p=A/2H based on the center-to-center spacing of the threads on the bobbin, or p=B based on the winding width of the thread wound on the bobbin. /2H can be determined.

The factor or coefficient p can, however, vary during the bobbin running process, particularly from ribbon winding to ribbon winding or from ribbon winding group to group of ribbon windings, according to a written program. For example, it may vary from whole number of ribbon wraps and mixed or partial ribbon wraps or from higher order ribbon wraps to less than four ribbon wraps.

In order to complement the ribbon winding prevention method according to the invention, it is proposed to avoid the ribbon winding that appears at the end of the bobbin run by discontinuously or preferably continuously reducing the traverse speed at the end of the bobbin run. be done. In this way, the traverse speed can be reduced in the same proportion as the spindle speed so that the winding factor remains constant. In this way, precision winding is performed in the last turn of the bobbin run.

According to the method of the present invention, products that were previously impossible to produce can be obtained. In particular, it has been impossible to produce a spinning bobbin in a usable form from stocking yarn on a spinning machine or stretch spinning machine with a diameter larger than H/π·tan α and a stroke of 120 mm or less. Here, polyamide-6.6 (nylon) gloss-spun yarn in the Teitel range of 10 to 50 dtex is particularly used as the yarn for stockings.

Such polyamide-6.6-spinning is currently
The fibers are spun at a spinning speed greater than 4500 m/min and after orientation or pre-stretching are wound up as a spinning bobbin at a winding speed greater than 4500 m/min. In order to obtain a small thread and a desired high throughput at the spinning station, several yarns are simultaneously spun at one spinning station and wound onto a corresponding number of bobbins. The bobbin length is limited for reasons of mechanical construction and lies between 70 and 120 mm, depending on the number of bobbins at the spinning station. The winding angle of such bobbins is typically between 6.5° and 8.5°. It has heretofore been impossible to manufacture such bobbins with a diameter larger than a given diameter. This is because, above a given diameter, the bobbin will have ribbon winding and mixed lower order or partial ribbon winding, which will eventually cause the bobbin to collapse. On the other hand, the spinning bobbin for polyamide-6.6-stocking spinning according to the present invention has D=H-π・
It is characterized in that in the diameter range tanα the average winding angle is preferably increased dramatically by up to 20 minutes.

Here, the winding angle is not constant over the length of the bobbin, but is partially larger or smaller at the edges compared to the center region, and also varies between the forward and backward strokes. It is possible. Here, the average winding angle is defined as an angle whose tangent (tan) is calculated from the average traverse angle and the bobbin circumferential speed. On the other hand, the average traverse speed is
It is determined from a predetermined constant number of revolutions or strokes of, for example, a grooved roll or a reciprocating threaded shaft of the traversing device. The increase in the wrapping angle according to the invention takes place in a predetermined area before and after a predetermined diameter. This area is the maximum of the defined diameter ±
1% area, specifically defined diameter ±B/
Can be set to 2H/100%. Here B is the width of the thread measured on the generatrix of the bobbin. When increasing the bobbin diameter further, diameter D = 1.33H/
It is proposed to increase the winding angle accordingly in the range π·tan α.

Traditionally, Teitel ranges larger than 50dtex, especially
When producing spinning bobbins from polyester hot spun yarns in the Teitel range of 78 to 167 dtex,
This polyester, especially polyethylene terephthalate gloss spun, has a high filament count greater than 40 single filaments or in the medium-fine (2.4 to 7 dtex) and extra-fine range (1.0 to 2.4 dtex)
Very great difficulties have been encountered in cases where the capillary teils are correspondingly small. Similar problems have arisen when spinning bobbins are produced from polyester gloss spuns of filament cross-sections, particularly octagonal cross-sections, with four or more sides rather than circular cross-sections. In this case too, small lengths, e.g.
It was not possible to produce bobbins with a length smaller than or equal to 240 mm and a bobbin diameter larger than D=2H/3π·tanα. According to the invention, this problem can be solved at least by diameter D=
2H/3π・tanα and D=H/π・tanα and D
This problem can be solved by increasing the average winding angle to 20 minutes in the region of =2H/1.5π·tanα. Such an increase in the average wrapping angle is due to the diameter region D (1±B/
2H), and is carried out over a maximum diameter region D (1±1%). FIG. 3b shows a thread section with a very large number of single filaments in a perspective view. When the yarn is spun, it assumes a roughly circular shape. The diameter D can therefore be defined.
However, when the same thread is wound in layers around a sleeve or bobbin, the single filament expands into a belt and has a predetermined width B. This width B is measured on the generatrix of the sleeve or bobbin.

According to an example of the construction of the spinning bobbin that can be used in the present invention, it is formed from stocking spinning up to 50 dtex - polyamide in the final tessel region - 6.6 gloss spinning, with a bobbin length in the range of 120 to 70 mm, H/π・With a diameter larger than tanα,
pre-oriented and/or wound at a winding speed greater than 4500 m/min, where α is the average winding angle of the yarn on the bobbin, measured between the tangent of the bobbin and the yarn, equal to 6.5 degrees. between 8.5 degrees and at least the diameter area D=H/π・tan α (1±B/2H)
Then, the average winding angle of the bobbin is dramatically increased to 20 minutes, so that B in the above equation is the width of the thread measured with respect to the generatrix of the bobbin.

In the above spinning bobbin configuration example, the maximum diameter region of the jump angle of winding is D=H/π・tan α
(1±1%). Furthermore, in the configuration example of the spinning bobbin described above, the bobbin diameter is larger than 1.33H/π・tanα, and the jump change in the average winding angle is determined by the diameter region D=1.33H/π・tanα.
(1±B/2H). moreover,
In the above spinning bobbin configuration example, the maximum diameter region of the increased winding angle is 1.33H/π・tanα (1±
1%). Another spinning bobbin that may be used in the present invention is formed from polyester spun with a final yarn area greater than 167 dtex, preoriented and/or wound at a winding speed greater than 3000 m/min, and having a filament count of greater than 3000 m/min. is greater than 40 and/or the non-round filament cross-section is greater than 4, in particular with 8 edges, and the bobbin diameter is greater than 2H/3π·tan α, where α is measured between the tangent to the bobbin and the thread. For spinning bobbins, which represents the average winding angle of the yarn on the bobbin, which is between 6.5° and 8.5°,
The average winding angle is at least in the diameter area D=2H/
3π・tanα, D=H/π・tanα, D=2H/1.5π・
tanα is increased to 20 minutes, and this increased area extends over at least the diameter area D (1±B/2H),
And it is made to extend over a maximum of D (1±1%). Further, according to the spinning or textile machine that can be used in the present invention, the grooved drums of the traverse devices of the plurality of winding locations are driven by one common drive shaft extending in the longitudinal direction of the machine,
In a multi-stage spinning machine for chemical fibers, the driving shaft is driven by one central electric motor, two driving shafts are provided, and the two shafts are driven by the central driving part at different rotation speeds, and each groove is 2 drums with
The drive shaft is selectively connected to one or the other of the two drive shafts via two clutches.

Further, in the above-mentioned spinning machine, one drive shaft is provided in the multi-stage spinning machine, and each grooved drum is supported without transmission connection, and each grooved drum starts from the drive shaft and has a different drive shaft. It can be selectively driven at two different rotational speeds via two transmission connections with transmission ratios and suitable clutches.

Furthermore, in the multi-stage spinning machine as described above, each grooved drum is supported floatingly on the drive shaft, each grooved drum is connected in transmission via a transmission connection and a clutch on both sides with an intermediate shaft, and The intermediate shaft and the drive shaft may be configured to be connected to each other via a third transmission connection.

Freewheeling each grooved drum onto the drive shaft
each grooved drum is supported by a clutch, and each grooved drum is drivingly connected via a transmission connection having an intermediate shaft and the clutch, and said intermediate shaft and drive shaft are connected to a third drive shaft.
may be configured such that they are interconnected by a power transmission connection.

Hereinafter, the present invention will be explained in detail in conjunction with examples.

FIG. 1 is a cross-sectional view of a thread winding machine for chemical fibers. The thread 1 runs at a constant speed v through a traverse thread guide 3 which is caused to reciprocate in a direction transverse to the running direction of the thread by a reciprocating screw shaft.
In addition to the yarn guide 3, the traverse movement device includes a grooved roll 4, and the yarn is guided in an endless reciprocating groove 5 formed in the roll 4 while partially winding the roll 4. Ru. The reference numeral 7 refers to the bobbin, and 6 represents the bobbin spindle (simply referred to as spindle) without transmission connection. A drive roll 8 is in contact with the periphery of the bobbin 7, and this drive roll 8 is driven at a constant circumferential speed. Here, the drive roll and the traverse mechanism as well as the bobbin spindle and the bobbin are movable relative to each other in the radial direction, and the spindle 6
Note that the interaxial distance between the drive roll 8 and the drive roll 8 is variable with increasing bobbin diameter. The reciprocating threaded roll 2 and the grooved roll 4 are driven by a three-phase motor, for example an asynchronous motor 9. The reciprocating threaded roll 2 and the grooved roll 4 are connected to each other by a transmission means, for example a drive belt 10. The drive roll 8 is driven by a synchronous motor 11 at a constant circumferential speed. Here, in order to drive the bobbin, the bobbin spindle 6 may also be driven using an electric motor whose rotational speed is controlled so that the circumferential speed of the bobbin remains constant even when the bobbin diameter increases. I would also like to mention that it is possible. Three-phase motors 9 and 11 obtain their energy via frequency converters 12 and 13. The synchronous motor 11 used for the bobbin drive is directly connected to a frequency converter 12 which generates an adjustable frequency f ₂ .
The asynchronous motor 9 is selectively connected via a switching device to a frequency converter 12 or a frequency converter 13, so that the traverse drive 9 can be driven at different speeds. Switch device 1
A calculator 15 is used to operate 4. The output signal 16 of the calculator 15 depends on the input. The following signals are continuously supplied as input. the traverse movement rotational speed determined by the measuring sensor 17 and converted into a number of reciprocating strokes in the computer according to corresponding criteria; the rotational speed of the bobbin spindle 6 determined by the measuring sensor 18; a programming device connected upstream of the computer. 19 output signals. Preferably, the programming device 19 is freely programmable and contains parameters important for ribbon winding prevention according to the invention, in particular the ribbon winding occurrence values to be prevented, and the ribbon winding occurrence values to be maintained. Safety distance, especially the factor p=
A/2H or p=B/2H and the ratio Q (=winding factor/jump magnitude of safety distance) and the predetermined traverse speed are stored.

In order to be able to change the ratio Q as well as the traverse speed or the difference in traverse speeds during the bobbin running process, the calculator 15 is provided with a further output 20 for controlling the frequency generator 13. .

FIG. 2 is a front view schematically showing a cross-wound bobbin formed on a sleeve 21 provided on the bobbin spindle 6. FIG. Additionally, FIG. 2 shows quantities important for bobbin formation. H is the length of the bobbin, which substantially corresponds to the stroke of the thread guide 3 or the groove 5. D represents the instantaneous bobbin diameter. The angle α represents the tilt or wrap angle measured between the thread and a tangent perpendicular to the generatrix of the bobbin. The angle γ represents the cross-winding angle of the yarn. A feature of coarse pitch winding is that during the winding traverse movement of the thread on the bobbin, the inclination angle and the traversing angle remain essentially constant, and especially on average.
However, at the end of the traverse of the thread relative to the bobbin, deviations occur, which deviations are utilized according to the invention to improve the bobbin formation.

FIG. 3a shows the occurrence of bobbin winding, particularly secondary ribbon winding. In state 1, the bobbin has a diameter D ₁ . The thread is wound around this bobbin at an inclination angle α. Note that only a small number of windings or turns are shown in the figure. Furthermore, instead of showing a front view of the bobbin as in the case of FIG. 2, only half of the wound yarn layer around the bobbin is shown. Note that the thread portion located on the other half side, that is, on the back side of the bobbin, is indicated by a dotted line. First, let's start with the thread section 22 that is wound around the front side of the bobbin. This thread section moves to the back of the bobbin and disappears from view at point 23, but reappears at the front at point 22 and is then reversed at a reversal point 25 at one end of the bobbin and continues as shown below. There is thus a spacing A between the yarns of successive turns, as shown for example between points 23 and 26, measured between the yarn centers on the generatrix. That is, the threads of adjacent turns are juxtaposed. This spacing decreases as it approaches an integer ribbon wrap occurrence value.

In the state shown in FIG. 3a, 2, the same inclination angle α
The same bobbin is shown having an increased diameter DSP with a secondary ribbon winding occurring on this bobbin. This increased diameter DSP
Then the length of one thread turn is exactly equal to one stroke, and the length of two thread turns is equal to a reciprocating stroke, so the ratio of the number of spindle revolutions to the number of reciprocating strokes is equal to two. As a result, successive turns are positioned exactly one above the other.
This results in a purely optical mark on the bobbin surface, which mark is referred to as an "image" or "mirror." As can be easily understood, if the ends of the yarn are precisely wound one above the other, even if the number of wound layers of yarn is very small, the yarns will slide out to the sides and become entangled with each other. Furthermore, the mass distribution becomes non-uniform over the length of the bobbin and/or around the bobbin. These disadvantages are avoided according to the invention by varying, in particular increasing, the winding angle in a bobbin of the type described above, as indicated by the dotted line in the diameter region in question. In this case α is smaller than α _stp ¨ _r . Figures 3b and 3c show unwound thread geometries as well as wound thread geometries on bobbin spools or other thread layers. In the latter case, the thread is wound with a width B. This width can be calculated, for example, from the filament number and filament teiter as well as other winding parameters, such as, for example, the thread tension, but it can be determined experimentally with great nominal precision. On the other hand, the yarn center distance A takes a value that fluctuates during the bobbin winding process. This value is equal to zero for ribbon winding where a mirror image occurs. For this spacing A, a minimum value can be determined experimentally, at which no ribbon curling signs with deleterious effects appear.

An embodiment of the method for preventing ribbon winding according to the present invention will be described with reference to the graph shown in FIG. curve 2
7 shows the winding factor S=NS/NCA, which decreases hyperbolically during the bobbin winding process, which is shown in this figure as a function of time. This curve shows that for coarse pitch winding the starting value of the traverse speed NCA is at least on average constant, whereas for the same yarn speed and bobbin surface speed and increasing bobbin diameter the number of spindle revolutions per unit time increases. This is caused by a decrease in NS. A bobbin structure is shown exhibiting 4th, 3rd and 2nd order ribbon winding occurrence values. At this point, ribbon winding prevention is performed. In this example, it has been found that it is also effective to block the mixed ribbon with a winding of 2.5 mm. It should be noted that the change in the winding factor for preventing ribbon winding is exaggerated for clarity of illustration. This applies in particular to the diagrams shown in FIGS. 4a and 4b. In Figures 4a and 4b,
Ribbon winding prevention for tertiary ribbon winding is illustrated. In this specification, the winding coefficient obtained from the starting value NACA of the traverse speed is referred to as the starting winding coefficient FA, and the winding coefficient obtained from the inhibition value of the traverse motion is referred to as the inhibiting winding coefficient.
It is called FS. The ribbon winding occurrence value 3 where the starting winding factor FA is an integer is shown by curve 27 in FIG. 4a.
When approaching by a safety distance S, the winding coefficient
In FA3.1 the traverse speed is switched from the starting value NCA to the stopping value NCS. In the illustrated example, the traverse speed increases. As a result, the winding factor is reduced to the blocking winding factor FS. This blocked winding factor FS decreases further as a function of decreasing spindle speed, as shown by curve 28. Here, according to the invention, a value proportional to the ribbon winding occurrence value and a predetermined percentage is given for the safety distance S in advance. This percentage is less than 5%. Furthermore, the jump height DF, i.e. the difference between the starting take-up factor 27 and the stopping take-up factor 28 at the time point 3.1 when switching from the starting traverse speed NCA to the stopping traverse speed NCS, is different from a multiple of the safety distance, in particular by a factor of 2. is an integer multiple. In the illustrated example, it is three times the safety distance. By increasing the jump height to more than twice the safety distance in this way, the winding factor changes with a larger acceleration when passing through the ribbon winding occurrence value 3 and the safety region extending from 3+S to 3-S. , that is, it can change very sharply. In this connection, it should be noted that technically it is not possible to increase the traverse speed infinitely. Even when switching the drive frequency from frequency f ₂ to frequency f ₃ in an abrupt manner using the switching device 14 as proposed in the invention, and by corresponding programming of the computer 15, the frequency f ₃ can be transiently changed during the switching. It is known from the technology that even if the traverse speed is increased to a value greater than the target frequency required to achieve the blocking value of the NCS, the winding factor transitions with a delay to the winding factor shown by curve 28. absolutely unavoidable. This is shown in curve 29 (variation function) which shows the actual variation process of the winding factor. It is clear from this curve that the delay increases as the blocking winding factor is approached. Corresponding to the definition given below, the winding factor varies with a variation function with a linear delay. By choosing n>2, ie by making the jump height greater than twice the safety distance, the integer ribbon winding occurrence value 3 is passed through very quickly. If the jump height is only twice the safe distance, the blocking winding coefficient will be 36, and the curve (variation function) 37 will pass through the ribbon winding occurrence value 3 more flatly than the curve 29. Therefore, the ribbon winding area, i.e., the 4th a
The residence time of the traverse speed within the positive and negative safety intervals, denoted T ₂ in the figure, is the fourth
It is larger than the corresponding residence time shown as T _o in Figure a.

The inhibited winding factor represented by curve 28 decreases with increasing diameter and decreasing spindle speed until the starting winding factor represented by curve 27 again reaches a predetermined safe distance from the ribbon winding value 3. , the traverse speed drops from the blocking value NCS to the starting value NCA, so that the jump height DF of the winding factor is again at least twice the safety distance (in this example 3
times).

It has been found that the safety interval, ie, the minimum separation of the winding factor from the ribbon winding occurrence value, is proportional to the ribbon winding occurrence value or proportional to the instantaneous winding coefficient. In the latter case, the safety interval for the take-up factor FA3.1, i.e. the take-up factor before reaching the ribbon winding occurrence value at the point when the traverse speed increases, is the take-up factor FA3.2, i.e. the traverse speed increases from the starting value. is greater than the safety interval for the winding factor at time 3.2. Therefore, if the safety interval is always correlated only to the instantaneous ribbon winding occurrence value, only a small calculation deviation will occur;
Technical considerations are no longer taken into account when forming a bobbin.

Further, as shown in FIG. 4, by keeping the winding factor greater than the ribbon winding occurrence value, which is 2 in the illustrated example, the bobbin end indicated by line 30 can be exceeded, or ribbon winding can occur at both ends. This can be completely avoided. this is,
This is because the traverse speed decreases at the same rate as the spindle speed decreases with increasing diameter.
In this case, the winding factor follows the curve 31. In the illustrated example, i.e. when the winding factor is constant,
Precision winding occurs during the last part of the bobbin run.

As already mentioned, despite abrupt variations in the drive parameters governing the rotational speed, the traverse speed does not change abruptly, ie with infinite acceleration. FIGS. 6a and 6b show in principle how a change in the traverse speed can be realized technically. In the upper graphs of Figures 6a and 6b,
The jumps in the drive frequency of the three-phase motor used to drive the traverse device are shown with superimposed differential components (indicated by dotted lines). In the case of electric drives, especially three-phase drives, this results in
As shown in the graph at the bottom of Figure a, the acceleration or deceleration first increases dramatically to its maximum value. When the three-phase motor approaches a predetermined drive speed at the changed frequency, the acceleration or deceleration decreases according to a linear or non-linear function.
After this acceleration process, the traverse speed change function shown in the middle graph of Figure 6a changes to 1
The following delay occurs. This means that the traverse speed initially increases sharply in very large jumps and then approaches, with a delay, the traverse speed predefined by the new frequency.

In other types of drives, for example drives with friction clutches, a jump in the drive parameters initially results in an acceleration or deceleration that increases from a zero or small value. After reaching the maximum value of the acceleration or deceleration, this acceleration drops back to zero either abruptly or steadily. This is illustrated in the lower graph of Figure 6b.

This results in an initially slow and then steep change in traverse speed when switching to higher or lower speeds. Traverse speed is the target value
When approaching the NCA or NCS, the delay intervenes again, so that the traverse velocity change function becomes flat (second-order or higher-order delay). This is illustrated in the acceleration graph (FIG. 6b) by the fact that the acceleration or deceleration does not decrease from its maximum value to zero in a jump, but according to a steady function, for example a linear function.

With reference to FIG. 4a, the method applied according to the invention has been described above, in particular when the change function of the traverse speed is jump-steep and there is no delay in the first phase after switching. As stated above.

Referring now to FIG. 4b, the method of the invention will now be described as applied when the traverse speed variation function has a second or higher order delay. In this case, the safe distance is chosen to be greater than the minimum safe distance.

The jump height DF is determined by the winding coefficient changing the traverse speed, the total safety area of ribbon winding,
That is, it is set largely so as to pass from FSP+S _nio to FSP-S _nio . That is, the jump height is at least equal to the minimum safe distance plus the selected safe distance. According to the technically defined change function of the traverse speed, the predetermined safety distance S and jump height DF are such that in each case the safety area is
It is selected to pass through the steepest region of the traverse speed change function or the steepest region of the winding coefficient change function. In the illustrated example, DF is exactly equal to the sum of the chosen safe distance and the minimum safe distance. As long as the variation function of traverse speed and winding factor has a large delay in approaching the blocking value, DF should be set larger than the sum of the selected safety distance and the minimum safety distance.

In the embodiment described with reference to FIG. 4b, the traverse speed is switched back from the blocking value to the starting value according to the principle described with reference to FIG. 4a. A minimum safety distance S _nio or a selected safety distance S could then be set as the safety distance for ribbon winding.

FIG. 5 illustrates, in another illustrative manner, an embodiment of the present invention for preventing ribbon winding by reducing traverse speed. In this figure, a hyperbolic function curve 32 represents the spindle rotational speed NS as a function of the bobbin travel (time). In this example, the spindle rotation speed is shown as being an integer multiple of the starting value of the traverse speed NCA. The traverse speed, expressed as number of round trips per minute, is curve 3.
3. As is clear from the figure, when the spindle speed is equal to an integer multiple of the traverse speed NCA, the traverse speed always changes to the starting value
Switched from NCA to blocking value NCS. This integer multiple corresponds to the ribbon winding factor value and the mixed ribbon winding factor value. NCA and NCS are preset as fixed values. The switching process will be explained in detail with reference to FIGS. 5a, 5b and 5c. In addition, Fig. 5b shows the fifth figure regarding the jump height.
This corresponds to the figure. The reduced jump height of FIG. 5a is shown in dotted lines in FIG. Chapter 5a
5b and 5c illustrate the avoidance of fourth-order ribbon winding.

A value that is an integral multiple of the starting value NCA of the traverse speed,
That is, when the value four times the starting value (4・NCA) approaches the spindle rotation speed NS by the safety interval S',
A switch is made. In the example shown in Figure 5, S′=
Please note that it is S/NC.

That is, S=FSP・A/2H or S=F・A/2H or S=FSP・B/2H or S=F・B/2H
As long as S′=FSP・NC・A/2H or S′=NS・A/2H or S′=FSP・NC・
B/2H or S'=NS・B/2H.

The value S' can therefore be easily determined electronically by measuring the spindle rotation speed and multiplying it by a constant value A/2H or B/2H and set by means of a circuit arrangement. However, this value also
S' can also be determined by measuring the traverse speed NC. In that case, the starting value NCA or the stopping value NCS may be multiplied by the value A/2H or B/2H and the programmed ribbon winding occurrence value (the winding coefficient at which ribbon winding occurs).

Thus, the traverse jump DC is four times the inhibition value of the traverse speed (4·NCS) in the fourth-order ribbon winding region. According to the invention, the jump height DF with the winding factor F=NS/NC is equal to Q·S.
Now for Q2. This means that in the illustrated example of FIG. 5, FSP・DC=Q・S', where DC is the difference in traverse speed (NCA
NCS). Therefore, following the definition of Q,
The traverse speed can be calculated for a given starting value of the blocking value. If the value 4.NCS then approaches curve 32 again, i.e. the speed of the bobbin spindle, the switching will occur at the latest with the interval between
This is performed when NS-4·NCS=S' (curve 35).

In FIG. 5b it is shown that the quotient Q is greater than 2 and that a function of variation of the traverse speed is obtained technically with a delay of the first order.

As is clear from FIG. 5b, the reversal of the traverse speed from the blocking value NCS to the starting value NCA is such that the spindle speed reaches a safety interval of an integral multiple (in this example 4 times) of the starting value of the traversing speed. (Function 34) This switching also
This can also be done at a later point in time when the spindle speed 32 approaches an integer multiple (in this example, 4 times) of the blocking value of the traverse speed by a safety distance S' (function
35). In principle, the switch from the blocking value to the starting value can take place at any point between functions 34 and 35. Switching at the final possible point, that is, when the spindle rotational speed reaches an integer multiple of the blocking value by a safe interval, is achieved by using the change function shown in the figure. is passed within a very short time T ₃₅ , ie the variation function 35 crosses the function 32 of the spindle speed in a very steep region.

If the switch is made early according to function 34, the intersection will be located in a region of high flatness, and as a result the ribbon-wrapping danger region (safe distance from top to bottom) will be traversed within a time T ₃₄ which is greater than T ₃₅ . . It should be noted here that the figures are not drawn to scale for clarity of illustration. In reality, the flatness of the functions 34 and 35 is considerably larger than that shown, since the safety distance S' is drawn to scale.

In the method shown in Figure 5a, we chose Q=2. Therefore, the switching of the traverse speed from the blocking value to the starting value requires that the spindle speed be changed to the value 4×(NCA+
NCS)/I went there when I turned 2. As a result, at the time of switching, the value FSP/NCS and the value FSP/NCA
has a safety distance S′ from the spindle speed NS. The method of FIG. 5b with Q > 2 is advantageous in that, for the variation function with the first-order delay shown, the blocking value of the traversal speed is maintained until the smallest safe interval, in particular the minimum safe interval, is reached. It is.

FIG. 5c shows an embodiment in which a quadratic delay (FIG. 6b) occurs as a function of the change in traverse speed. In this embodiment, it is expedient to carry out a reversal of the traverse speed from the blocking value to the starting value when the starting winding factor has again reached the safe distance S, in particular the minimum safe distance from the ribbon winding onset value. Yes, and advantageous. This means that in the example of Fig. 5c, the switching from the blocking value to the starting value of the traverse speed means that four times the starting value of the traverse speed or an integer multiple close to it is a safe interval of the spindle speed.
This means that it is advantageous to do this when S′ is reached again. This switching point is switching point 36. In this switching, a transit time T ₃₆ occurs during which the winding factor or 4 times the traverse speed passes through the ribbon winding safety area. On the other hand, switching
If this is done when the traverse speed reaches the safe interval S of the spindle speed by four times the blocking value, then at the switching point 37 there will be a transit time T ₃₇ through the fourth-order ribbon winding danger zone; Much larger than time T ₃₆ . In any case, if the change function of the traverse speed exhibits a large degree of flatness on the approach to its desired value, in particular the starting value of the traverse speed, as indicated by the dotted line in FIG. 5c, the switching point 36 and 37, in other words a large safety interval between an integral multiple of the starting value of the traverse speed and the spindle speed. In other words, even in the case of the ribbon winding prevention embodiment shown in FIG. Care should be taken to ensure that the

FIG. 5 also shows that mixed ribbon winding 2.5 is also blocked. A possible secondary ribbon winding at the bobbin running end (line 30) is avoided by reducing the traverse speed in the same ratio as the spindle speed.

According to the invention, ribbon winding to be prevented can also be freely programmed. To the best of the inventor's knowledge, it has not been possible heretofore to make accurate predictions as to the harmful effects of ribbon winding to be prevented. The effect of each individual ribbon winding can be determined by experiment or testing.

Furthermore, it has been found that the mass distribution of the thread on the bobbin is also very strongly dependent on the safety distance maintained. This is based on the fact that at high bobbin rotational speeds, ie when bobbin diameters are small, ribbon winding appears in a highly localized distribution around the circumference and length of the bobbin. On the other hand, if the spindle speed is low, ie the bobbin diameter is large and the bobbin is short, the ribbon winding will occur at the same location around the circumference and/or length of the bobbin for a significantly longer period of time. However, this phenomenon is not limited to the ribbon winding occurrence value of the winding coefficient, and may appear between the ribbon winding occurrence value and the mixed ribbon winding occurrence value in some cases. For this reason, the safety distance is preferably also freely programmable depending on the ribbon winding and mixed ribbon winding. For this purpose, in particular, the factor p=S/FSP could also be variably programmed.

Furthermore, the ratio Q=DF/S is preferably predetermined and freely programmable depending on the value of the ribbon winding occurrence to be prevented. In this way, it becomes possible to greatly accelerate or decelerate the traverse speed to pass through the ribbon winding occurrence value, which has been experimentally found to be particularly important.

In addition, the safety interval (S1) of the winding coefficient approaching the ribbon winding occurrence value may be set to be different from the safety interval (S2) of the winding coefficient after switching, or the ratio S1/S2 may be made variable. be able to.

It should be mentioned here that the variation of the traverse speed cannot, as has been mentioned, be carried out exclusively by means of electrical devices. That is, in spinning machines with one central traversing drive for several bobbins (such as filament spinning machines), the traversing device for the individual bobbins may be a suitable clutch, freewheel transmission, override clutch or the like. can be selectively driven by shafts rotating at two different speeds via a transmission connection, in which case switching of such transmission connection is performed by adjusting the winding factor from an integer or fractional ribbon winding generation value according to the invention. a safety interval is maintained, and the starting and stopping values of the traverse speed are set in such a way that the change in the winding factor caused by switching the traverse speed is at least twice the safety interval. be exposed. In the case of filament textured yarns, the yarn tension changes relatively only slightly, so that large changes in the traverse speed are possible.

FIG. 7 shows a filament processing machine as a multistage spinning machine for processing chemical fibers. Heater 38, yarn 39, temporary twisting spindle 4
0, second transporter 41, winding bobbin 4
2. Drive roll 43, drive roll drive unit 44, drive shaft 45 belonging thereto, grooved drum or reciprocating threaded shaft 46 (hereinafter referred to as grooved drum);
A traverse drive 47 and a drive shaft 48 are shown on which a plurality of grooved drums are mounted. Note that the drive shaft 48 extends in the longitudinal direction of the machine.

In FIG. 8, the drive of the grooved drum 46 is schematically shown. The grooved drum 46 is rotatably mounted on a drive shaft 48 and is provided with gear wheels 49 and 50 on each side, which have slightly different sizes. Drive shaft 48
drives an intermediate shaft 53 via gear wheels 51 and 52 with axially displaceable clutch members 54 and 55. The clutch member can be attracted towards the friction liners of gears 58 and 59 by stationary magnets 56 and 57. Gear wheels 58 and 59 are freely rotatably supported on intermediate shaft 53 and are constantly engaged with gear wheels 49 and 50 of the grooved drum. By alternately actuating clutch members 56 and 57, the grooved drum can be driven at slightly different rotational speeds.
The clutch members are alternately actuated by a computer and programming device as described in connection with FIG. One component of the transmission clutch connection (for example one of the gears 50, 59, the clutch member 55 and the magnet 57) is connected to a flywheel clutch 60 (directional clutch: Dubble's "Taschen-buch fu¨r den Maschinenbau"). 14
ed., 1981, p. 414).
This clutch transmits the slow rotation of the drive shaft 48 directly to the grooved drum 45. On the other hand, the high speed rotation of the grooved drum is transmitted via a transmission consisting of gears 51, 52, 58, 49 by actuating the clutch member 56. Furthermore, element 5
If a freewheel 60 is used instead of 0, 59, 57, 55, etc., the transmission connections 51, 52 can be replaced by an automatic drive of the shaft 53.

Method claims 34, 36 and 37
are combinable with all method claims of the invention.

The above can be achieved by temporarily switching the traverse speed to a blocking value when the winding coefficient approaches the ribbon winding occurrence value, and rapidly passing the ribbon winding occurrence value in the forward or backward stroke. , the invention has been described in connection with avoiding the symptoms of ribbon wrapping. For the first time, this method successfully produced large diameter spinning bobbins or stretch spinning bobbins from chemical fibers with specific properties. Because ribbon winding symptoms appear in many mixed ribbon windings, and because ribbon windings and mixed ribbon windings are often located very closely next to each other, the method described above prevents the later appearance of ribbon winding symptoms. It cannot be stopped. Such ribbon winding symptoms can occur, for example, if the traverse speed is switched from a starting value to a blocking value which is within the mixed ribbon winding region. In this case, the switching of the traverse speed to the blocking value can be prohibited, or alternatively, the ribbon-wrapping symptoms that appear after switching to the blocking value can be ignored as being less of a negative symptom. Also, by delaying the switching of the traverse speed,
That is, it can also be performed without considering the safety distance. Otherwise, there is a risk of entering the ribbon winding region or mixed ribbon winding region by switching the traverse speed. In order to eliminate such drawbacks and to avoid ribbon winding symptoms which do not absolutely require a change in traverse speed but can lead to defects, at least the starting value of the traverse speed should always be kept at a maximum and minimum value. We propose to change (oscillate) between. For the purpose of preventing ribbon winding,
It is already well known to vary the traverse speed periodically or non-periodically around an intermediate value.
In the case of certain ribbon windings or mixed ribbon windings with very low ribbon winding signs, the above-mentioned oscillation of the starting value of the traverse speed makes it unnecessary to switch the traverse speed to the stopping value. However, this switching can also be performed with reduced safety intervals.

As previously mentioned, oscillating the traverse speed arrest value may alternatively or additionally avoid or reduce ribbon winding symptoms that appear in mixed ribbon winding regions of the traverse speed arrest value.

The above vibrations can also be performed in an integer ribbon winding region, particularly in a higher order integer ribbon winding region. It is also applicable to mixed ribbon winding regions, especially low order mixed ribbon winding regions.

Thus, according to the invention, the ribbon winding prevention by jump-jumping of the ribbon winding occurrence value in combination with increasing and decreasing oscillations between the limit values of the starting value and/or the blocking value of the traversing speed makes it possible to Defect-free spinning properties over the entire volume, even at high diameter-to-stroke ratios, in particular homogeneity and uniform coloring, e.g. overhead removal of the yarn from the bobbin at high withdrawal speeds of >1.000 m/min It is possible to obtain defect-free bobbins characterized by very good unwinding properties, overhead yarn take-off without yarn breakage or fluctuations in yarn tension, and which also have unfavorable winding properties. It is also suitable for forming bobbins with yarns containing small yarns, such as spinning yarns for stockings or yarns with small individual capillary tassels.

When combining (superimposing) vibrations as described above, according to the invention, the safe distance of the winding coefficient from the ribbon winding occurrence value is determined by the winding coefficient obtained from the average vibration traverse velocity (starting value or blocking value). It is measured from the average value of the coefficient. This average or intermediate value of the safety interval is determined according to the invention.
That is, this value should be greater than the amplitude of the take-up factor resulting from oscillations in the traverse speed. This thing is
This means that the limit value of the winding factor resulting from oscillations in the traverse speed must not fall within the ribbon winding occurrence value or mixed ribbon winding occurrence value region.
Rather, it is preferred that these limit values of the winding factor also maintain a certain safety distance. However, this safety distance can be set relatively small.
This is because the time taken to pass this limit value of the winding factor is always very short. However, the limit value of the winding factor is determined according to the invention by S _nio =FSP
A minimum safe distance of xp _nio = FSP x B/2H should be maintained.

The amplitude of the vibrations in this case preferably corresponds to the minimum safe distance. For this, the percentage of vibration a
It is advantageous for p to be essentially equal to the coefficient p.
In that case, a=B/2H. Here, a
is AMP/NC = maximum value of traverse speed - minimum value of traverse speed / average value of traverse speed,
B is the previously defined thread width, and H is the already defined bobbin stroke.

The safety distance according to the invention should therefore always be greater than the amplitude of the winding factor in the ribbon winding region, which amplitude can be expressed by the formula: F×a/1+a or approximately FA=FSP×a/1+a. Therefore, it is calculated. However, it is advantageous if the vibration limit values also maintain a minimum safe distance. In this case,
The safety spacing is greater than the minimum safety spacing FSP×p _nio plus the amplitude of the winding factor in the ribbon winding region. Here, the minimum interval of the limit value of the winding coefficient from the ribbon winding occurrence value is represented by Z, and is calculated by FSP×
Advantageously, it is equal to B/2H.

However, if vibration is applied, the limit value of the winding coefficient may approach the ribbon winding occurrence value in some cases.

The average value or intermediate value of the traverse speed, which is important for setting the switching point, is advantageously determined by measuring the vibration values and integrating the continuously measured vibration values, even when vibrations are superimposed. .

As already mentioned, it is not necessary to vibrate the entire bobbin travel range. Therefore, it is proposed that the vibration time be predetermined in relation to the occurrence of ribbon winding. This vibration time can be determined experimentally. Also, the duration of the vibration and its relative amplitude a=
NC _nax −NC _n /NC _n can be predetermined and programmed depending on the ribbon winding occurrence. Relative amplitude is the starting value of traverse velocity NCA
and rejection value NCS are advantageously the same.

In this case, in a known manner, if the stroke-reducing movement is additionally superimposed or combined, the stroke-reducing movement and the oscillating movement of the traversing device are adjusted to one another in such a way that the resultant yarn speed remains essentially constant. be able to.

An embodiment in which ribbon winding prevention due to a jump in the winding coefficient and vibration in the traverse speed are superimposed or combined will be described with reference to FIGS. 9 to 11. 9 and 10 illustrate an example corresponding to FIG. 5. The exemplified method is 4
This concerns the next ribbon winding. This fourth-order ribbon winding occurs when four times the average starting value of the traverse speed is equal to the spindle rotational speed. That is, this occurs when 4×NCAM=NS. According to the invention, a changeover to the blocking value of the traverse speed takes place when the average value NCAM of the starting values reaches the complete distance S' from the spindle speed. Here, S′ is
The dimensions are predetermined such that a minimum safe distance Z' is maintained between the limit value of the quadruple traverse speed and the spindle speed. Therefore, Z' is advantageously equal to the minimum safe distance S' _nio according to the invention.

FIG. 9 shows the case where the blocking value of the traverse speed is greater than the starting value. The coefficient Q is greater than 2.

FIG. 10 shows the case where the blocking value of the traverse speed is smaller than the starting value. The coefficient Q is 2
be equivalent to.

Here, in order to achieve as abrupt a change as possible in the traverse speed and the winding factor, the switching point and the oscillations must be adjusted so that the direction of variation in the traverse speed is as shown in FIGS. 9 and 10. It is particularly emphasized that they should always be aligned with each other to coincide with the vibration direction. In the example in Figure 9,
When the starting value of the traversing speed approaches the spindle rotational speed, the traversing speed is increased to the blocking value, so that the switching takes place in the vibration layer in which the traversing speed is increased. This is especially true when changing the traverse speed, as in the case of switching from the starting value to the blocking value in FIG. 9 and back switching from the blocking value to the starting value in FIG. Applicable if passing.

In order to implement the method of using superposition of traverse speeds to prevent ribbon winding as described above in accordance with the present invention, modifications to the apparatus shown in FIG. 1 are required.
That is, as shown in FIG. 11, an integrator 61 is additionally provided, and this integrator integrates the continuous measured values of the traverse speed detected by the sensor 17 to obtain an average value. Furthermore, an additional frequency converter 62 is required. Frequency converters 13 and 6
2 generates a drive frequency corresponding to the starting and stopping values of the traverse speed. On the other hand, the frequency generator 12 is used only for driving the drive roll 8.
The frequency generators 13 and 62 are controlled by a vibration device 63 which superimposes the vibration frequency on the target average frequency of the starting and stopping values of the traverse speed. The vibration generator 63 can be controlled by the programming device 19 via the computer 15.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view schematically showing the structure of a thread winding machine for chemical fibers, FIG. 2 is a front view schematically showing a twill bobbin formed on a sleeve provided on a bobbin spindle, and FIG. Figure 3a is a diagram illustrating normal twill and ribbon winding, Figure 3b is a perspective view showing a portion of the yarn before it is wound around a bobbin, and Figure 3c is a diagram showing the yarn being wound around a sleeve or bobbin and pressed into a flat shape. FIG. 4 is a graph illustrating an embodiment of the ribbon winding prevention method according to the invention; FIGS. 4a and 4b are diagrams illustrating the ribbon winding of the third order and the parameters considered in the invention; FIG. FIG. 5 is a graph illustrating another embodiment of the method of the present invention for preventing ribbon winding by reducing traverse speed, FIGS. 5a, 5b and 5. 5
Figure c is a diagram illustrating switching of traverse speed, No. 6
Figures a and 6b are graphs illustrating the principle of realizing changes in traverse speed by changing drive parameters of the traverse device, and Figure 7 is a schematic diagram showing the configuration of a multistage spinning machine for processing chemical fibers. , FIG. 8 is a schematic diagram showing the drive mechanism for the spinning machine, FIGS. 9 and 10 are diagrams showing another embodiment of the method of the invention for imparting vibrations to the traverse speed, and FIG. 10 is a diagram showing the configuration of a spinning winding machine equipped with a drive unit for implementing the method shown in FIG. 10; FIG. 1,39... Thread, 2... Threaded roll, 3...
... Thread guide, 4 ... Grooved roll, 5 ... Groove, 6
...Bobbin spindle, 7...Bobbin, 8...
Drive roll, 9...Asynchronous motor, 10...Toothed belt, 11...Synchronous motor, 12, 13...
Frequency converter, 14... Switch device, 15...
Computer, 17, 18... Measurement sensor, 19... Program device, 21... Sleeve, 38... Heater, 41... Transporter, 42... Winding bobbin, 43, 45, 48... Drive shaft, 44...
Drive shaft drive motor, 46...grooved drum, 47
...Traverse drive section, 49, 50, 51, 5
2, 58, 59...Gear, 53...Intermediate shaft, 5
4,55...Clutch, 56,57...Magnet, 6
0...Freewheel clutch.

Claims (1)

[Claims] 1. A method for preventing ribbon winding that occurs when winding a yarn in coarse pitch winding by transiently changing the traverse speed, characterized by simultaneously using the following means: , that is, 1.1 Over a predetermined section of bobbin travel,
Continuously change the traverse speed between the maximum value and the minimum value (change it oscillatingly) 1.2 Winding factor FA=NS/NCA or FS=
Ribbon winding occurrence value with predetermined NS/NCS
When approaching the FSP, the average value of the traverse speed is transiently changed between the initial value NCA and the blocking value NCS, or conversely between the blocking value NCS and the initial value NCA, and the change is discontinuous. During the discontinuous change, the winding coefficient maintains a predetermined minimum safe interval from the ribbon winding occurrence value FSP, and jumps through the minimum safe interval FSP±Smin of the ribbon winding occurrence value. So,
The minimum safety interval Smin is the minimum permissible difference between the winding factor FA or FS and the next ribbon winding occurrence value FSP, the spindle rotation speed NS is the number of spindle rotations per unit time, and the traverse A method for preventing the occurrence of ribbon winding in winding yarn in coarse pitch winding, characterized in that the speed is the number of reciprocating strokes, each consisting of a reciprocating movement of the traversing device, per unit time. 2. The method for preventing ribbon winding according to claim 1, wherein the vibration is performed in a predetermined mixed (partial) ribbon winding region. 3 Restriction value NCS of traverse speed for predetermined ribbon winding and/or mixed ribbon winding
A method for preventing ribbon winding according to claim 1 or 2, wherein the method vibrates the ribbon. 4 Winding coefficient FA from ribbon winding occurrence value FSP
Alternatively, as a measure of the minimum permissible interval of FS, a safety interval is preset between a predetermined ribbon winding occurrence value and a winding factor determined from the average value of the vibrated traverse speed NCA or NCS. A method for preventing ribbon winding according to any one of items 1 to 3. 5 Safety interval is traverse speed NCS or
5. A method for preventing ribbon winding as claimed in claim 4, which is greater than the amplitude of the winding coefficient resulting from vibrations of the NCS. 6. The safety interval between the limit value of the winding factor determined from the vibrations of the traverse speed NCA or NCS and the ribbon winding occurrence value is less than or equal to Smin, and preferably FSP・B/2H
less than or equal to H
The method for preventing ribbon winding according to claim 5, wherein B represents the bobbin length, and B represents the width of the yarn wound on the bobbin measured in the bobbin generatrix direction. 7. Ribbon according to any one of claims 1 to 6, in which the percentage a=AMP/NC, where AMP stands for the amplitude of the oscillating traverse velocity, is less than or equal to B/2H. How to prevent curling. 8. A method for preventing ribbon winding according to any one of claims 1 to 7, wherein the traverse speed is measured and integrated to obtain an average value. 9. A method for preventing ribbon winding according to any one of claims 1 to 8, in which the vibration time is predetermined depending on the ribbon winding occurrence value. 10. A method for preventing ribbon winding according to any one of claims 1 to 9, wherein the duration of the vibration and/or the percentage a are predetermined and programmed depending on the ribbon winding occurrence value. 11 Predetermining the vibration percentage a to be the same value for the starting value NCA and the blocking value NCS of the traverse speed during the vibration time, as claimed in claims 1 to 9.
The method for preventing ribbon winding according to any one of the preceding items.