Device for winding a group of threads

Abstract

The present invention relates to an apparatus for winding a spool of yarn, particularly in a melt spinning process for producing synthetic yarns. The spool of yarn is wound at a plurality of winding positions (1.1-1.8) to form a bobbin (12), which are arranged along a winding spindle (3.1) in a frame (2). Each winding position (1.1-1.8) has a traverse unit (5.1-5.8) for placing one of the yarns onto the bobbin (12). Each traverse unit (5.1-5.8) is associated with one of a plurality of guides (6.1-6.8) for separating the spool of yarn, which is fed to the guide by at least one pull-out guide roller. According to the invention, in order to distribute and unfold the filament with the least possible friction and the most uniform possible distribution, the guides (6.1-6.8) distributed between the winding positions (1.1-1.8) are formed by a freely rotatable or driveable guide roller (14), and part of the guides are formed by a fixedly held guide element (15).

Description

Technical Field

[0001] The present invention relates to an apparatus for winding yarn bundles, particularly in melt spinning processes for producing synthetic yarns. Background Technology

[0002] For example, WO2007 / 085274A1 provides information on a general-purpose device for winding assemblies of wire.

[0003] In melt spinning, filaments extruded from a polymer melt are typically extruded through numerous spinning nozzles in a parallel manner and then extracted and guided as filament bundles by a guide roller system. In this guide roller system, the filaments are guided parallel to each other with small filament spacing. Therefore, a spacing between filaments in the range of 4 to 6 millimeters is conventional. For winding the filament bundles, known equipment has multiple winding positions to wind each individual filament into a bobbin. The bobbin width results in a larger spacing between these winding positions, meaning the filament bundle must be separated within a range of subsequent winding positions after leaving the extraction guide rollers.

[0004] WO2007 / 085274A1 discloses, in principle, two variations of an apparatus for winding yarn bundles. In the first variation, a pull-out guide roller for guiding the yarn bundle is arranged laterally beside the winding position, such that the yarn bundle separates substantially from the horizontal plane with a significant turning direction at a guide mechanism located at and distributed within the winding position. In this case, a freely rotatable deflector roller is preferably used as the guide mechanism.

[0005] In the second variation upon which the invention is based, the pull-out guide roller is arranged approximately centrally relative to the winding position, such that the yarn bundle is unfurled by the guide mechanism after leaving the pull-out guide roller, allowing the yarn to be introduced into the winding position. In this case, a stationary guide element is used as the guide mechanism because the yarn wrapping is significantly smaller. Therefore, the height of the pull-out guide roller above the winding position is typically chosen such that the yarn in contact with the guide mechanism receives only a relatively small wrapping. Excessive yarn wrapping inevitably leads to varying yarn tension during winding. Therefore, especially in cases where there are numerous winding positions along the winding spindle, the pull-out guide roller must be of sufficient height to prevent unacceptable wrapping from occurring on the guide mechanism. Thus, such an apparatus for winding yarn bundles preferably has a height-adjustable pull-out guide roller to allow operation at the start of the process. Summary of the Invention

[0006] Therefore, the object of the present invention is to develop this type of device for winding assemblies in such a way that the distribution and separation of the assemblies over a large number of winding positions can be achieved with a compact arrangement and fixed guide rollers.

[0007] According to the invention, this objective is achieved in such a way that the guide mechanism distributed within the winding position range is formed partly by a guide roller and partly by a fixedly held guide member. It has been found that it is advantageous for the guide roller to be rotatable, and in particular, freely rotatable. It has also been found that it is advantageous for the guide roller to be driven.

[0008] A particular advantage of this invention is that the yarn bundle can be extended even with a relatively large wrap angle in the yarn guide mechanism. Therefore, a winding position where the upstream yarn guide mechanism requires a relatively obvious turn in the supplied yarn can be formed using a freely rotatable or driven guide roller. Conversely, a yarn guide mechanism with a relatively small yarn wrap due to the extension of the yarn bundle can be formed using a fixedly held guide member. Therefore, the combination of a freely rotatable (or driven) guide roller and a fixedly held guide member as the winding position has the particular advantage that the withdrawable guide roller can be held above the winding position with a relatively small gap. Thus, a very compact arrangement for winding the yarn bundle can be obtained.

[0009] For the guide rollers centrally arranged relative to the winding position, the present invention provides the following improvement: a fixed guide element forms a central set of guide mechanisms, and a guide roller forms two outer sets of guide mechanisms. Therefore, the devices distributed within the outer winding position range can be guided with a relatively large wrapping on the guide mechanism (in this case, the guide roller). Conversely, those in the central region with a much smaller wrapping are guided in the guide mechanism by the fixed guide element. Thus, approximately the same wire tensile stress can be generated at each winding position for winding the wire on the bobbin.

[0010] The distribution of the guide rollers and wire guides within the winding position range is advantageously determined by the supply angle, which is adjusted by guiding the wire between the wire guide mechanism and the withdrawing guide roller. Therefore, the permissible wrapping on the wire guide mechanism can be determined, resulting in no significant over-wrap friction in the corresponding wire.

[0011] In practice, it has been found that the stationary wire guide is associated with the winding position, where the wire can be guided between the wire guide mechanism and the pull-out guide roller at a supply angle greater than 20°. In this case, the supply angle is formed between the horizontal line connecting the wire guide mechanism and the wire path between the respective wire guide mechanism and the pull-out guide roller. In this respect, the wire guide mechanism and the winding position can be clearly associated with each other based on the supply angle.

[0012] Therefore, a freely rotatable or driven guide roller is associated with the winding position, where the yarn can be guided between the guide mechanism and the pull-out guide roller at a supply angle of less than 20°. It has been found that a supply angle of less than 20° on the guide mechanism produces unacceptable yarn friction, resulting in varying yarn tension during winding of the bobbin. These issues can be prevented by using a freely rotatable or driven guide roller.

[0013] Due to the compact arrangement of the pull-out guide rollers, the apparatus for winding yarn assemblies according to the present invention is particularly suitable for producing fully drawn yarns. To this end, the present invention provides an improvement in which the pull-out guide rollers are positioned downstream of the guide roller assembly for drawing and relaxing the yarn assembly, the guide roller assembly being held above the frame at the winding position by a guide roller bracket, wherein the pull-out guide rollers and the guide roller assembly are laterally oriented relative to the winding spindle. This allows for a very short yarn path with minimal turning, wherein the guide rollers can be held at a convenient working height for the user.

[0014] In this regard, it is preferable to implement the following improvement of the invention, in which the pull-out guide roller is held at a working height of up to 2 meters above the operating corridor.

[0015] To wind a large number of wires in a filament bundle, the present invention provides the following improvement: the guide roller is associated with two sets of winding positions that face each other in a mirror-symmetrical manner, in which case the guide roller and the guide element are identically distributed in a separate frame. Therefore, for example, 24 or 32 wires can be wound simultaneously to form a bobbin. Attached Figure Description

[0016] The following description, with reference to several embodiments and accompanying drawings, explains in more detail the apparatus according to the invention for winding yarn assemblies, particularly in melt spinning processes for producing synthetic yarns, wherein:

[0017] Figure 1 A schematic diagram of a first embodiment of the apparatus for winding a filament assembly according to the present invention is shown.

[0018] Figure 2 Show Figure 1 A schematic cross-sectional view of an embodiment,

[0019] Figure 3 A side view schematic diagram of another embodiment of the apparatus for winding a filament assembly according to the present invention is shown.

[0020] Figure 4 A side view schematic diagram of another embodiment of the apparatus for winding a filament assembly according to the present invention is shown.

[0021] Figure 5 Show Figure 4 A front view schematic diagram of an embodiment. Detailed Implementation

[0022] Figure 1 This is a side view schematic diagram of a first embodiment of the apparatus for winding a filament assembly according to the present invention. This embodiment shows eight winding positions 1.1-1.8 arranged side-by-side in a frame 2. The winding positions 1.1-1.8 extend along the winding spindle 3.1 and are held protrudingly on a rotatable support winding turntable 9. In each winding position 1.1-1.8, a bobbin 12 is wound around the circumference of the winding spindle 3.1. The winding spindle 3.1 is driven for this purpose by a spindle drive device 11.1.

[0023] For winding the yarn to form a bobbin 12, each winding position 1.1-1.8 has a traverse unit. Traverse units 5.1-5.8 are arranged side-by-side on the frame 2, and each traverse unit has one or more traverse guides that guide the relevant yarn at winding position 1.1-1.8 back and forth within the bobbin width. Traverse units 5.1-5.8 are associated with a plurality of guide mechanisms 6.1-6.8 at intervals in the upper region of the frame 2. Guide mechanisms 6.1-6.8, together with the traverse units 5.1-5.8 arranged below, form a so-called traverse triangle in which the relevant yarn is guided back and forth. Guide mechanisms 6.1-6.8 respectively supply yarn to their respective winding positions 1.1-1.8. Guide mechanisms 6.1-6.8 will be explained in more detail below.

[0024] To place the yarn onto the surface of the bobbins 12, the pressure roller 4 is associated with the traversing units 5.1-5.8. The pressure roller 4 is mounted on the frame 2 via a movable roller bracket 22. In this configuration, the pressure roller 4 extends over all the bobbins 12 wound on the winding spindle 3.1.

[0025] To ensure the continuous winding of the supplied yarn into bobbins at winding positions 1.1-1.8, a second protruding winding spindle 3.2 is arranged on the winding turntable 9. The winding spindle 3.2 is arranged on the turntable 9 at a 180° offset relative to the winding spindle 3.1. To receive the bobbins 12, winding spindles 3.1 and 3.2 carry the winding bobbins 13 for each winding position 1.1-1.8. The winding spindle 3.2 is connected to a spindle drive device 11.2. The winding turntable 9 can be actively driven to rotate on the frame 2 by the turntable drive device 10 to provide winding spindles 3.1 and 3.2 for bobbin changes. The winding spindles 3.1 and 3.2 can thus be alternately guided to the working area and the changeover area. Figure 1 In the middle, the winding spindle 3.1 is held in the working area so as to wind the supply wire of the wire group 8 to form a bobbin 12.

[0026] exist Figure 1In the illustrated equipment, winding positions 1.1-1.8 are sequentially used during the melt spinning process to continuously wind the freshly extruded filament bundles to form bobbins. The filament bundles are guided by guide rollers in this melt spinning process. Therefore, in Figure 1 In this configuration, the final guide roller is positioned in front of the winding positions 1.1-1.8, as shown in the figure. This guide roller, referred to in this embodiment as the so-called pull-out guide roller 7, guides the yarn assembly 8 while partially enclosing the circumferential surface of the guide roller cover. Since the yarns of the yarn assembly 8 are guided on the circumferential surface of the guide roller 7 with relatively small spacing between them, the yarns of the yarn assembly 8 need to be stretched and distributed at the winding positions 1.1-1.8. For this purpose, guide mechanisms 6.1-6.8 are immediately arranged downstream of the pull-out guide roller 7, so that depending on the position of the guide mechanisms 6.1-6.8 relative to the pull-out guide roller 7, the yarns of the yarn assembly 8 are guided at different wrapping angles on the guide mechanisms 6.1-6.8. To allow for a relatively large wrap angle on the guide mechanisms 6.1-6.8 when the height difference between them and the guide roller 7 is small, the outer guide mechanisms 6.1 and 6.2, and 6.7 and 6.8, are formed by the guide roller 14. The central guide mechanisms 6.3 to 6.6 are formed by the stationary guide member 15. This situation is... Figure 2 It is shown in magnification.

[0027] Therefore, in Figure 2 In the illustrated case, the central group of the wire guiding mechanisms 6.3-6.6 is formed by a fixed wire guide 15. Wire guiding mechanisms 6.1 and 6.2, as well as 6.7 and 6.8, each form an outer set of wire guides, which take the form of a guide roller 14. On each wire guide 6.1-6.8, the wires of the wire group are guided with different wrapping configurations. In this embodiment, the wire wrapping is determined by the wire supply angle. The supply angle extends along the horizontal line formed by the wire guiding mechanisms 6.1-6.8 and between the wire sheet and the pull-out guide roller 7 of each wire guiding mechanism 6.1-6.8. In this example, the supply angle is indicated as α1 to α8. The wires of the wire group 8 are thus guided at a supply angle α1 on the guide roller 14 of the wire guiding mechanism 6.1 at winding position 1.1. Therefore, at winding position 1.2, the wires of the wire group 8 are guided at a supply angle α2 on the guide roller 14 of the wire guiding mechanism 6.2.

[0028] If possible Figure 2 As shown in the diagram, the supply angles of the central group of guide mechanisms 6.3-6.6, all formed by guide elements 15, are specified as α3 to α6. These supply angles α3 to α6 are all greater than the supply angles α1 and α2 and α7 and α8 in the outer groups of guide mechanisms 6.1 and 6.2, and 6.7 and 6.8, formed by guide rollers 14. The freely rotatable or driven guide rollers 14 in the outer winding positions 1.1, 1.2, 1.7, and 1.8 thus allow for high wire wrapping during supply.

[0029] In practice, regarding the distribution of the guide roller 14 and the guide element 15, it has been found that the freely rotatable or driven guide roller 14 is associated with the winding positions 1.1-1.8, at which the yarn can be guided between the guide mechanism 6.1-6.8 and the withdrawing guide roller 7 with a supply angle of less than 20°. Therefore, for the fixed guide element 15 distributed within the winding positions 1.1-1.8, the following correlation arises: the guide mechanism 6.1-6.8 (where the yarn can be guided with a supply angle ≤20°) takes the form of the guide element 15. Thus, the distribution of the guide roller 14 and the guide element 15 within the winding positions 1.1-1.8 depends on the distance between the withdrawing guide roller 7 and the guide mechanism 6.1-6.8.

[0030] exist Figure 1 and Figure 2 In the illustrated embodiment, the yarn assembly 8 is guided by the pull-out guide roller 7 in a yarn movement plane parallel to the winding positions 1.1-1.8. For this purpose, the pull-out guide roller 7 is oriented parallel to the winding spindle 3.1. However, in principle, the yarn assembly can also be guided in a laterally oriented yarn movement plane relative to the winding positions 1.1-1.8. In this regard, Figure 3 An example is shown.

[0031] exist Figure 3 In the illustrated embodiment, the pull-out guide roller 7 is laterally oriented relative to the winding spindle 3.1. Therefore, as the yarn assembly extends, different yarn pull-out points are generated on each yarn of the yarn assembly 8 at the circumference of the pull-out guide roller 7. However, the supply angles α1 to α3 on the guide mechanisms 6.1-6.8 remain unchanged. In this respect, apart from the arrangement of the pull-out guide roller 7, Figure 3 Implementation examples and according to Figure 2 The embodiments are the same. Therefore, to avoid repetition, please refer to the above description.

[0032] The device of the present invention Figure 1 and Figure 3 A particular advantage of the illustrated embodiment involves that the pull-out guide roller 7 can be positioned at a working height accessible to the operator. Therefore, in Figure 3 The working height A is illustrated by example. For operability, the pull-out guide roller 7 can be easily positioned at a maximum working height of 2 meters above the operating corridor 23. The pull-out guide roller 7 can be advantageously and securely mounted on the guide roller bracket. Therefore, the apparatus of the present invention is preferably suitable for winding yarn assemblies to wind fully drawn yarn into bobbins in melt spinning processes.

[0033] In this regard, Figure 4 and Figure 5 Another embodiment of the device of the present invention is illustrated schematically with multiple views. Figure 4This embodiment is shown in a side view. Figure 5 This embodiment is shown in a front view. Unless one of the figures is explicitly mentioned, the following description applies to both figures.

[0034] If possible Figure 5 As shown in the diagram, a group 8 of yarns with a large number of strands is wound into bobbins 12 and 12' through two sets of winding positions 1.1-1.12 and 1.1'-1.12'. The winding positions 1.1-1.12 are arranged side-by-side in the first frame 2, and the winding positions 1.1' to 1.12' are arranged in a mirror-symmetrical second frame 2'. The frames 2 and 2' have identical structures and are formed, along with their assemblies, only in a mirror-symmetrical manner. Therefore, each frame 2, 2' has two winding spindles and one bobbin winding turntable. The winding positions 1.1-1.12 and 1.1'-1.12' are arranged according to... Figure 1 and Figure 3 The above embodiments are configured in the same way, so no further explanation is given here. Frames 2 and 2' are arranged below frame 24. Frame 24 carries guide roller bracket 17, and the guide roller assembly 16 of the guide roller bracket is driven by guide roller drive device 20. The guide roller assembly 16 is formed by a plurality of individually driven guide rollers 16.1-16.5.

[0035] Figure 4 A side view of the guide roller assembly 16 and winding positions 1.1-1.12 is shown. The guide roller assembly 16 includes five additional pull-out guide rollers 16.1 to 16.5 in addition to the pull-out guide roller 7. These additional pull-out guide rollers are configured to be heated to draw and relax the yarn assembly. A wetting agent 18 and a turbulence device 19 are provided in the yarn path between the guide roller assembly 16 and the pull-out guide roller 7 to compact the multifilament thread of the yarn assembly 8. The yarn of the yarn assembly is then distributed in two groups within the winding positions 1.1-1.12 and winding positions 1.1'-1.12' (not shown in this example). The guide mechanisms 6.1-6.12 and 6.1'-6.12' associated with the winding positions 1.1-1.12 and 1.1-1.12' are partially formed by the guide roller 14 and partially by the guide element 15.

[0036] If possible Figure 4As shown in the diagram, the outer wire guide mechanisms 6.1-6.3 and 6.10-6.12 each form two outer groups, each formed by a guide roller 14. Wire guide mechanisms 6.4-6.9 represent the central group, which is always formed by guide elements 15. The mirror-symmetrically opposed wire guide mechanisms 6.1-6.12' have the same distribution of guide rollers 14 and guide elements 15. U-shaped ceramic guide elements or pigtail-shaped guide elements are preferably used as the stationary guide elements 15 in this case. The freely rotatable or driven guide rollers 14 preferably have circumferential guide grooves for guiding the wire with the lowest possible level of friction.

[0037] According to Figures 1 to 5 In the illustrated embodiment, the number of winding positions and the distribution of the wire guides with guide rollers and guide rollers in the winding positions are exemplary. However, in principle, the wire guides can be divided into two groups based on the position of the withdrawing guide rollers. Therefore, in the case of eccentrically arranged withdrawing rollers, the first group of wire guide mechanisms can be formed by wire guides, and the second group of wire guide mechanisms can be formed by guide rollers. In this case, the important aspects are the wire extraction from the withdrawing guide rollers to the winding positions and the supply angle adjusted in this case.

Claims

1. An apparatus for winding a group of threads, the apparatus having a plurality of winding positions (1.1-1.8) arranged in a frame (2) along a winding spindle (3.1), wherein, Each of the winding positions (1.1-1.8) has a traversing unit (5.1-5.8) for placing one of the yarns onto a corresponding bobbin, wherein each of the traversing units (5.1-5.8) is associated with one of a plurality of yarn guide mechanisms (6.1-6.8) for separating the yarn group, and wherein the yarn group is fed to the yarn guide mechanism (6.1-6.8) by at least one pull-out guide roller (7). Its characteristics are, The guide mechanism (6.1-6.8), distributed within the winding positions (1.1-1.8), is partially formed by a guide roller (14) and partially by a fixedly held guide element (15). The distribution of the guide roller (14) and the guide element (15) within the winding positions (1.1-1.8) is determined by a supply angle (α), which is adjusted by guiding the yarn between the guide mechanism (6.1-6.8) and the pull-out guide roller (7). The guide element (15) is associated with the winding position (1.1-1.8), at which the wire can be guided between the guide mechanism (6.1-6.8) and the pull-out guide roller (7) at the supply angle (α) > 20°, wherein the deflector roller (14) is associated with the winding position (1.1-1.8), at which the wire can be guided between the guide mechanism (6.1-6.8) and the pull-out guide roller (7) at the supply angle (α) < 20°.

2. The apparatus of claim 1 wherein the means for determining is configured to determine the number of bits based on a number of bits used to represent a number of subcarriers in a frequency domain. With the pull-out guide roller (7) centered relative to the winding position (1.1-1.8), the fixed guide member (15) forms the central group of the guide mechanism (6.1-6.8), and the turning roller (14) forms the two outer groups of the guide mechanism (6.1-6.8).

3. The apparatus of claim 1 or 2, wherein The pull-out guide roller (7) is arranged downstream of the guide roller assembly (16) for drawing and relaxing the yarn assembly, the guide roller assembly being held above the frame (2) at the winding position (1.1-1.8) by a guide roller bracket (17), wherein the pull-out guide roller (7) and the guide roller assembly (16) are laterally oriented relative to the winding spindle (3.1).

4. The device as described in claim 3, characterized in that, The pull-out guide roller (7) is held at a maximum working height (A) of 2 meters above the operating corridor (23).

5. The device as described in claim 1 or 2, characterized in that, Two sets of winding positions (1.1-1.12, 1.1'-1.12') are associated with the pull-out guide roller (7), and the winding positions (1.1-1.12, 1.1'-1.12') face each other in a mirror symmetrical manner, at which time the steering roller (14) and the guide (15) are identically distributed in a separate frame (2,2').

6. The device as described in claim 1 or 2, characterized in that, The steering roller (14) is able to rotate freely.

7. The device as claimed in claim 1 or 2, characterized in that, The steering roller (14) is driven.

8. The device as claimed in claim 1 or 2, characterized in that, The equipment is used to wind up yarn bundles in a melt spinning process for producing synthetic yarns.

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