EP1514824B1 - Crosswound bobbin and method for producing of such a bobbin - Google Patents

Description

The invention relates to a cross-wound bobbin according to the preamble of claim 1 and a method for the production thereof according to the preamble of claim 4.

Cross wound coils can be made with a true winding, with precision winding or with stepped precision winding. As used herein, the term "cross-wound bobbin" also includes the bobbin that builds up during winding of the cross-wound bobbin.

When producing a cross winding with a wild winding, the speed of the threading and the peripheral speed of the cross-wound bobbin during the bobbin travel, that is, from the beginning to the end of the winding process, are in a fixed relationship to one another. As a result, the crosshair angle remains constant, while the turns ratio decreases with increasing coil diameter. The turns ratio indicates the number of spool revolutions per double stroke of thread traversing. A cross-wound package produced with a wild winding should have a stable package and a substantially uniform density. When passing through, in particular, integer values of the turns ratio, so-called winding patterns or mirror windings occur. In order to avoid their adverse consequences, so-called image interference methods are used for this, but they do not completely resolve the winding images.

When manufacturing a cross wound coil with precision winding, not the crosshair angle, but the turns ratio over the entire coil travel is maintained constant. The cross-hair angle is reduced with increasing cross-coil diameter. In principle, the advantages of precision winding are the possibility of a high take-off speed, high winding density and thus more run length with the same bobbin volume compared to a cross-wound bobbin in a wild winding. The decreasing crosshead angle with increasing cross-coil diameter can limit the diameter in the manufacture of precision spools of staple fiber yarns.

A step precision winding is a combination of winding and precision winding that exploits the advantages of both types of winding and avoids the disadvantages. It is a precision winding in steps made, for example, in which a maximum allowable crossing angle is set, which is smaller within a stage at a constant winding ratio. If the crossing angle reaches a smallest permissible level, the crossing angle is abruptly returned to the initial value. The turns ratio jumps to a smaller value. This results in a cheese with an approximately constant crossing angle, wherein the turns ratio has been reduced in stages.

A known problem in the production of cheeses of all three types of winding is the increased density at the flanks of the cheeses. Since the thread at the reversal point can not be stored acute-angled, but always in a radius is created, it comes at the edges of the cheese to a density increase, which causes a "bulging" of the edges. These because of the higher density "hard" edges are for optimum packing density and for a subsequent dyeing process of the cheese from disadvantage.

If the thread is guided by a grooved drum for traversing during the laying process, it has long been for example from the DE-PS 683468 it is known to let this grooved drum oscillate along its axis at a low frequency and thus to distribute the laying of the yarn at the edge in a defined area. The stroke of the traverse remains the same. With this type of "edge laying", the density distribution in the edge area is made uniform, but the interior of the coil remains "softer", that is, with a lower density.

Another way to improve the density distribution of the coil, is the targeted reduction of the laying width.

From the DE 35 05 453 A1 It is known to shorten and extend the traverse stroke during winding in the production of cheese packages with "wild winding". This shortening and lengthening of the traverse stroke after a double stroke is called breathing. The traverse stroke is repeatedly shortened at both ends and then returned to its original value. By breathing a better density distribution should be achieved.

Also by the DE 38 26 130 A1 a method or a device is described, which is to avoid. Edge bulges or Kantenverdichtungen suggests a shift of the thread reversal points. This is to be achieved by changing the position of the guide ruler of a Flügelchangiereinrichtung.

Also the DE 100 21 963 A1 describes the so-called breathing when winding threads in "wild winding". The length of the traverse stroke is changed periodically, wherein at the beginning of the respiratory cycle, the thread is deposited at a turning point at the outer edge of the cheese. So that after completion of the respiratory cycle, the thread is not stored at the circumference of the coil in the same place, the speed and the traverse stroke of the traversing yarn guide is controlled so that the thread is after completion of the respiratory cycle at a reversal point offset to the reversal point at the beginning of the respiratory cycle.

The generic DE 43 10 905 A1 describes a thread laying for producing a cross-wound bobbin, in which the laying width in each case after passing through the thread by two reversal points, ie after a double stroke of traversing movement, is changed by new turning points are determined. Depending on the desired specification, the accumulation of density at the edge of the cross-wound bobbin can be reduced and the density distribution evened far into the interior of the bobbin, so that with optimal setting the cheeses can be produced with a substantially homogeneous density distribution.

Due to the higher packing density and better running properties, the precision or the step precision winding is often preferred in the manufacture of cheeses instead of the "wild winding". By optimizing the selection of the turns ratios, it is possible to influence the thread placement purposefully in this type of winding. The excellent visual appearance of the yarn layers and the technological properties of such a cheese can be kept the same over the entire coil travel in very narrow limits, which is not possible with a "wild winding". However, this occurs both in precision winding and step precision winding same problem when laying the thread in the edge region of the cheese on as in the "wild winding".

If the precision or the stepped precision winding is now used to avoid the "hard" bulging edges in the same way as is known from the "wild winding", by carrying out the above-described reduction of the laying width or a conventional edge laying, then The yarn layers deposited in an orderly manner without the edge laying are shifted into one another at the edges of the cross-wound bobbin, and the bobbin construction and the optical appearance of the bobbin lose their characteristics and thus the advantages of precision winding. This is the transmission of a known in the "wild winding" known Hubverkürzung on the precision winding or step precision winding in the way.

The invention has for its object to improve the construction of cheeses with precision winding or step precision winding.

This object is achieved by a cross-wound bobbin with the features of claim 1 and by a method having the features of claim 4.

Further advantageous embodiments of the invention are the subject of the dependent claims.

Due to the variation of the laying width according to the invention, it is possible to avoid the "hard" curved edge even with Präzisionsbewicklungsarten. The packing density, homogeneity and flow properties of the cheese can thus be significantly improved. The basic structure of precision winding is not lost. In addition to the technological advantages of a cross-wound bobbin thus produced and the orderly appearance is a characteristic quality feature with which the cheese according to the invention advantageously stands out from the known prior art.

By reducing the frequency of Hubatmung to the alternating frequency between successive yarn layers, the advantageous density distribution is not reduced. Rather, it was surprisingly found that due to the Windungsart precision winding or step precision winding and additionally by undisturbed production of the yarn layers both the absolute density of the cheese increases and improves their homogeneity. In the case of the cross-wound bobbin according to the invention and the process for its production, the characteristic visual impression and the advantageous technological properties of the precision winding, such as, for example, excellent running properties, good optics and high packing density, are unrestricted.

To close a Garnlage it comes when the lozenges of the cheese are filled or closed. After filling the rhombus, the thread rest takes place again at the beginning of the rhombus. This will be referred to as a backward stroke in the following. If the respective directly overlapping yarn layers differ in width from one another or if the change in the laying width occurs with each backward stroke, local density maxima can be avoided. Advantageously, yarn layers with reduced width alternate and yarn layers with coil width from. This is an effective optimization of the density distribution can be achieved.

If at least half of the total width of the closed yarn layers is the bobbin width, a clean, firm edge of the cheese is produced.

If the respective reduced laying width is varied, on the one hand a sufficient optimization is possible and on the other hand the control is simplified.

If the thread sections during filling of the respective rhombus successively offset only by such an amount that they completely close the respective rhombus before the return stroke, or the thread sections are stored spaced within the rhombus and stored after the next backward stroke, the new thread sections in the resulting gaps a particularly high density and homogeneity of the cheese can be achieved.

A swivel thread guide allows a favorable distribution of the masses to be moved and high traversing speeds with precise control of the thread laying.

Further details of the invention are explained with reference to FIGS.

Fig. 1

in vereinfachter, schematisierter Darstellung eine Spulstelle zur Durchführung des erfindungsgemäßen Verfahrens in Seitenansicht,

Fig. 2

eine alternative Ausbildung einer Spulstelle in vereinfachter, schematisierter Darstellung,

Fig. 3

eine Prinzipdarstellung einer offenen Präzisionswicklung,

Fig. 4

eine Prinzipdarstellung einer geschlossenen Präzisionswicklung,

Fig. 5

eine offene Präzisionswicklung mit Kantenverlegung auf bekannte Weise,

Fig. 6

eine geschlossene Präzisionswicklung mit Kantenverlegung auf bekannte Weise,

Fig. 7-10

den stufenweisen Aufbau einer geschlossenen Garnlage,

Fig. 11

eine Prinzipdarstellung eines Teils des Kantenbereiches einer Kreuzspule in vereinfachter Schnittdarstellung,

Fig. 12

drei geschlossene Garnlagen mit erfindungsgemäßer Variation der Verlegebreite.

Fig. 13-18

die Ausbildung von gefüllten Rauten.

It shows:

Fig. 1

in a simplified, schematic representation of a winding unit for carrying out the method according to the invention in side view,

Fig. 2

an alternative embodiment of a winding unit in a simplified, schematic representation,

Fig. 3

a schematic representation of an open precision winding,

Fig. 4

a schematic representation of a closed precision winding,

Fig. 5

an open precision winding with edge laying in a known manner,

Fig. 6

a closed precision winding with edge laying in a known manner,

Fig. 7-10

the gradual construction of a closed yarn layer,

Fig. 11

a schematic representation of part of the edge region of a cross-wound bobbin in a simplified sectional view,

Fig. 12

three closed yarn layers with inventive variation of the laying width.

Fig. 13-18

the training of filled diamonds.

In the winding device 1 according to a package forming spools according to FIG. 1 the cheese 2 is driven by a rotating in the direction of arrow 4 friction roller 3. The cross-wound bobbin 2 is held in a pivotable creel 5 and rests on the friction roller 3. The thread 6 is supplied in the direction of arrow 7. The thread 6 passes through the axis of the cheese 2 reciprocating yarn guide 8 and is wound onto the cheese 2. The drive of the yarn guide 8 by means of the traversing device 9. The friction roller 3 is driven via the shaft 10 by means of the motor 11. The traversing device 9 is connected via the operative connection 12 to the motor 13. Both the engine 11 and the engine 13 are controlled by the microprocessor 14. The microprocessor 14 includes a program for controlling the laying distance of the thread 6 in dependence on the actual diameter of the cheese 2. The current diameter of the cheese 2 is calculated from the accumulated on the cheese 2 thread length. The thread length is determined by means of the sensor 15, which detects the revolutions of the friction roller 3. The sensor 16 is used to detect the rotational speed of the cheese 2, which is like the sensor 15 connected to the microprocessor 14. The measuring head 17 detects the diameter of the running thread 6 and is also connected to the microprocessor 14.

FIG. 2 shows a winding unit with a pivotable thread guide. Whose winding device 18 supports the cross-wound bobbin 20 by means of the coil frame 19. During the winding process, the driven cross-wound bobbin 20 lies with its surface on a pressure roller 21 and takes this unpowered pressure roller 21 by means of friction with. The drive of the cross-wound bobbin 20 via a variable speed drive means 22. For traversing the thread 23 during the winding process, the traversing device 24 is provided. The traversing device 24 comprises a finger-like, pivotable yarn guide 25, which, by a electromechanical drive applied to the thread 23, as in FIG. 2 indicated, traversed between the two end faces of the cheese 20. The thread 23 slides during its laying by the yarn guide 25 on a guide rule 26. The control of the winding device 18 and the traversing device 24 by means of a microprocessor 27 via the lines 28 and 29. Such a traversing device, as in FIG. 2 is shown, for example, in the DE 198 58 548 A1 or parallel to it US Pat. 6,311,919 described in detail.

With the in FIG. 2 The winding device 18 shown, the laying movement of the thread 6, 23 of a flank 30 of the cheese 20 to the other edge 31, the so-called traversing or laying stroke, controlled varies.

In FIG. 3 is shown a Garnlage a Präzisionsbewicklung without edge laying. Since the thread offset in the direction of the coil axis, that is, the distance between two adjacent, parallel threads is significantly greater than the diameter of the threads, it is called an "open" Präzisionsbewicklung. For better recognizability of the yarn layer 32 produced in open Präzisionsbewicklung is in FIG. 3 only this situation was shown separately and has been dispensed with the representation of the remaining cross-wound bobbin. This kind of representation becomes for the same reason also with the FIGS. 4 to 12 applied.

If the laying of the thread is controlled so that the thread distance is approximated to the diameter of the thread, it is called a "closed" Präzicbewicklung. With the in FIG. 4 presented, in closed Garnierlage 33 produced a much higher packing density of the cheese, compared with a yarn layer 32 in open Präzisionsbewicklung reachable.

If you apply in the precision winding to avoid "hard" edges relationship to equalize the density of the cheese over a traverse stroke on a conventional known edge laying, as it is done in the "wild winding", the orderly laid without edge laying yarn layers are now on the Edges shifted into each other and the coil structure or the visual appearance loses the characteristic of a precision winding.

FIG. 5 provides a Garnlage 34 in open Präzisionsbewicklung and FIG. 6 a Garnlage 35 in closed Präzisionsbewicklung, where each conventional edge laying was made. The uniformity of the yarn layer and thus, for example, the high packing density and the homogeneity have been lost by the conventional edge laying recognizable.

The emergence of a closed yarn layer in closed Präzisionsbewicklung show the FIGS. 7 to 10 , Depending on the chosen turns ratio, lozenges are formed on the bobbin surface, which are continuously filled with yarn with continuous bobbin travel. If the thread offset is chosen to be small, this process takes a correspondingly long time. Further explanations for filling diamonds can the DE 100 15 933 A1 or their parallel US Pat. 6,484,962 be removed. Are the diamonds on the coil surface completely filled, there is a completely closed yarn layer. The traverse stroke, which is also called laying stroke, is changed each time after such a closed yarn layer has been completed. For this purpose, for example, the reversal points of the traverse stroke in the direction of the center of the traverse stroke or moved inwards.

FIG. 11 shows a highly simplified representation of some exemplary yarn layers in the edge region on the bobbin surface of a cross-wound bobbin. In the yarn layer 38 shown as the lowest yarn layer, the width of the laying or traverse stroke over the coil width B _SP of the in the representation of FIG. 11 left flank 39 of the cheese to the right flank 40. The reversal points 41, 42 and the storage points of the thread of the lower yarn layer 38 are changed for the overlying yarn layer 43. The yarn layer 43 has the reversal points 44 and 45 and has a smaller width B _red than the underlying yarn layer 38. After the yarn layer 43 is also completed as a "closed yarn layer", the traverse stroke is varied again and on the yarn layer 43, the yarn layer 46th stored. The yarn layer 46 again has the same width, namely the coil width B _SP , as the yarn layer 38. The yarn layer 46 is followed by the yarn layer 47 whose width B _{red is} reduced again. The width B _{red of} the yarn layer 47, however, is slightly greater than the width B _{red of} the yarn layer 43. A yarn layer 48 with the package width B _SP is again placed on the yarn layer 47, etc. While every second yarn layer has the package width B _SP , the width is B _red varies the respectively intermediate yarn layers. FIG. 12 shows three closed yarn layers, of which the wound on the lowest closed yarn layer yarn layers each have a smaller width B _red . The yarn layer on the in the representation of the FIG. 12 top yarn layer is wound, may again have the coil width B _SP . However, this additional yarn layer is not shown, so that the gradation of the three yarn layers produced by the Hubverminderung remains visible.

The closing of the diamonds in the formation of yarn layers is based on the FIGS. 13 to 18 explained in more detail. FIG. 13 shows from the multitude of rhombuses, as shown for example in the illustration of FIG. 7 can be seen, a single rhombus 49, in each case only the thread sections 50 of the thread 6, 23 are shown, which form the rhombus 49. After formation of the rhombus 49, the thread sections 51 become as in FIG FIG. 14 shown misplaced. The thread sections 51 have the laying distance v to the nearest thread sections 50 and run parallel to these. Subsequently, further thread sections 51a are laid in parallel and at the laying distance v to the respective previously deposited thread sections 51, 51a. The thread 6,23 is in the thread sections 50, 51 and 51a and in the rest FIGS. 13 to 18 shown as a line, which is the position of the center line of the thread 6, 23 can be seen. However, the line thickness does not represent the true-to-scale diameter of the thread 6, 23. The laying distance v is, taking into account the diameter of the thread 6, 23 chosen so that an "open" Präzisionsbewicklung and that the distance between the respective parallel thread sections 50 by the laying distance v is integer divisible. If in addition to the thread sections 50, 51 more thread sections 51a so are stored, that the next thread section 51a would be stored on or beyond the thread section 50 addition, the rhombus 49 is closed. There is a closed yarn layer in open Präzisionsbewicklung. Now, a backward stroke to the diamond start is performed, and the laying operation is continued with the formation of new diamonds in the same manner as described above. The new diamonds are filled up until a new closed yarn layer is present. The new closed yarn layer is laid over the previously formed yarn layer. When reversing a change in the laying width of the traversing movement is made in each case. A cheese according to the invention, the yarn layers are formed in open Präzisionsbewicklung, is well suited for a subsequent dyeing process. The basic structure of the precision winding is retained.

An alternative formation of yarn layers is in FIG. 15 and FIG. 16 shown. At the beginning of a yarn layer of this embodiment, first a diamond formation of thread sections 50 as described in the rhombus 49. The Indian FIG. 15 shown laying distance v between the thread sections 50 and the nearest thread section 52a and each between the subsequently stored thread sections 52a is taking into account the diameter of the thread 6, 23 chosen so that an "open" Präzisionsbewicklung. If the last filed thread section 52 only so little spaced from the nearest thread section 50, namely with the distance v _m that the next thread section 52a would be stored on or beyond the thread section 50 addition, there is a backward stroke. Subsequent to the backward stroke, the thread sections 52b are each returned to a laying distance v filed to each other. If a thread section 52b is only so slightly spaced from the thread section 50 that the next thread section 52b would be deposited on or beyond the thread section 50, a backward stroke takes place again. Subsequent to the backward stroke further thread sections, not shown here for reasons of simplification, are deposited until the last deposited thread sections are only spaced apart from the thread section 50 by the distance v _m . Thus, the rhombus 49 is closed again and now a change in the laying width of the traversing movement is made on the return stroke. There are yarn layers in open Präzisionsbewicklung on which then the next yarn layers can be stored.

Another alternative formation of a yarn layer in open precision winding is in FIG FIG. 17 and FIG. 18 shown. At the beginning of a yarn layer of this embodiment, first a diamond formation of thread sections 50 as described in rhombus 49 already described. The Indian FIG. 17 shown laying distance v between the thread sections 50 and the nearest thread section 53a and each between the subsequently stored thread sections 53a is taking into account the diameter of the thread 6, 23 chosen so that an "open" Präzisionsbewicklung. If the thread section 53 only so little spaced from the thread section 50, namely with the distance v _m that the next thread section 53 a would be stored on or beyond the thread section 50 out, there is a backward stroke. Subsequent to the backward stroke, the thread sections 53b are each deposited centrally between the thread sections 53a. Is the last filed thread section 53b only so little spaced from the thread section 50 that the next

Thread portion 53b would be stored on or beyond the thread section 50 addition, there is a backward stroke. Thus, the rhombus 49 is closed again and now a change in the laying width of the traversing movement is made on the return stroke. On the finished yarn layers, the next yarn layers can then be stored.

The inventive change of the traverse stroke a good density distribution over the stroke width of the cheese according to the invention is achieved. It is possible to avoid the "hard" arched edge even with precision wrapping. Packing density, homogeneity and flow characteristics of the cheese can be improved.

The invention is not limited to the illustrated embodiments. In particular, the selection of the traverse stroke for the width B _{red can} vary. It is also possible a different design of the traversing device. The type of filling of the diamonds and the selection of the backward stroke, in which the laying width of the traversing movement is changed, may differ from the illustrated and described embodiments.

Claims (11)

1. Crosswound bobbin, which is formed by means of precision winding or stepped precision winding, wherein the diamonds formed during the winding have been filled gradually to form yarn layers by yarn sections wound closely next to one another or wound spaced apart parallel to one another,
   characterised in that
   a portion of the yarn layers (38, 43, 46, 47) differs in width from the others.
2. Crosswound bobbin according to claim 1, characterised in that the yarn layers lying directly on top of one another differ from one another in width.
3. Crosswound bobbin according to claim 1 or 2, characterised in that yarn layers (43, 47) with a reduced width B_red alternate with yarn layers (38, 46) with bobbin width B_SP.
4. Method of producing a crosswound bobbin according to claim 1, wherein the yarn running onto the crosswound bobbin is subjected to a traversing movement by means of a thread guide, which movement can be controlled independently of the drive of the crosswound bobbin and determines the crossing angle and the winding width, wherein respectively the diamonds formed by the winding are filled gradually to form yarn layers by yarn sections wound closely next to one another or wound spaced apart parallel to one another,
   characterised in that only when the yarn sections (51, 51 a, 52, 52a, 52b, 53, 53a, 53b) which are offset during the winding of the crosswound bobbin (2, 20) from the beginning of the diamond gradually to the end of the diamond have reached the diamond end and there is a backwards stroke to the beginning of the diamond, is a change made in the winding width.
5. Method according to claim 4, characterised in that the change in the winding width is performed with each backwards stroke to the beginning of the diamond.
6. Method according to claim 4 or 5, characterised in that at least half of the yarn layers of different widths is wound with bobbin width B_SP.
7. Method according to one of claims 4 to 6, characterised in that the respective reduced winding width is varied.
8. Method according to one of claims 4 to 7, characterised in that the diamonds (49) are filled completely before the change in the winding width.
9. Method according to claim 8, characterised in that the yarn sections (51, 51 a) when filling the respective diamond (49) are offset gradually by such an amount, that they completely fill the respective diamond (49) before the backwards stroke.
10. Method according to claim 8, characterised in that the yarn sections (52, 52a; 53, 53a) can be placed spaced apart inside the diamond (49) and after the next backwards stroke the new yarn sections (52b; 53b) can be placed into the gaps formed, so that the diamonds (49) are only filled completely over several strokes.
11. Method according to any one of claims 5 to 9, characterised in that the yarn (23) is placed by means of a pivotable yarn guide (25).

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