WO2022253680A1

WO2022253680A1 - Device for winding a ground of threads

Info

Publication number: WO2022253680A1
Application number: PCT/EP2022/064269
Authority: WO
Inventors: Denis Bauer; Jen Supra
Original assignee: Oerlikon Textile Gmbh & Co. Kg
Priority date: 2021-06-04
Filing date: 2022-05-25
Publication date: 2022-12-08
Also published as: DE102022112853B3; CN117396417A

Abstract

The invention relates to a device for winding a group of threads, more particularly in a melt spinning process for producing synthetic threads. The group of threads is wound at a plurality of winding stations (1.1 - 1.8) to form packages (12), which are disposed along a winding spindle (3.1) in a machine frame (2). Each of the winding stations (1.1 - 1.8) has a traversing unit (5.1 - 5.8) for transferring one of the threads onto a package (12). Each of the traversing units (5.1 - 5.8) is assigned one of a plurality of thread-guiding means (6.1 - 6.8) for separating the group of threads, and the group of threads is fed to the thread-guiding means by means of at least one take-off godet. According to the invention, in order to be able to distribute and spread out the threads with as little friction as possible and as evenly as possible, some of the thread-guiding means (6.1 - 6.8) distributed among the winding stations (1.1 - 1.8) are formed by freely rotatable or driven deflecting rollers (14) and some of said thread-guiding means are formed by stationarily held thread guides (15).

Description

Device for winding a bundle of threads

The invention relates to a device for winding up a group of threads, in particular in a melt-spinning process for the production of synthetic threads, according to the preamble of claim 1.

A generic device for winding a sheet of threads is known for example from WO 2007/085274 A1.

In a melt spinning process, the threads extruded from a polymer melt are usually extruded through a large number of spinnerets in parallel next to one another and drawn off and guided as a group of threads through godet systems. On the godet systems, the threads are guided parallel to each other with a small thread spacing as a sheet of threads. So thread distances between the threads in the range of 4 - 6 mm are common. For winding the thread sheet, the most ten devices have several winding positions in order to wind each individual thread in a Wi ckelstellen into a coil. Because of the width of the spools, such winding points are at a greater distance from one another, so that the group of threads has to be divided up between the following winding points after it has run off a run-off godet.

From WO 2007/085274 A1, two variants of the device for winding up a sheet of threads are known in principle. In a first variant, a run-off godet for guiding the group of threads is arranged laterally next to the winding points, so that the group of threads are essentially separated from a horizontal plane with a strong deflection at the thread guide means upstream of the winding points and are distributed to the winding points. Freely rotatable deflection rollers are preferably used as the thread guiding means.

In a second variant, on which the invention is based, the godet is arranged essentially in the middle of the winding points, so that the group of threads is spread open by the thread guide means after it has run off the godet to allow the threads to enter the winding positions. Here, stationary thread guides are used as thread guiding means, since the entanglement of the threads is significantly lower. So it is customary to select the height of the godet above the winding point in such a way that the threads receive only relatively small loops when they come into contact with the thread guides. Thread wraps that are too large inevitably lead to different thread tensions when winding the threads. Especially with a large number of winding points along a winding spindle, the godet must therefore have a sufficient height so that no impermissible loopings occur on the thread guides. Devices of this type for winding up a group of threads therefore preferably have a height-adjustable run-off godet in order to enable operation at the start of the process.

It is therefore the object of the invention to further develop the generic device for winding up a group of threads in such a way that the group of threads can be distributed and separated over a large number of winding points in a compact arrangement and with a stationary godet.

According to the invention, this object is achieved in that the thread guide means distributed over the winding points are formed partly by deflection rollers and partly by thread guides that are held stationary. It has turned out to be advantageous if the deflection rollers are rotatable, in particular freely rotatable. It has also turned out to be advantageous if the deflection rollers are driven.

Advantageous developments of the invention are defined by the features and feature combinations of the dependent claims.

The invention has the particular advantage that spreading the crowd of threads is also possible with larger angles of wrap on the thread guide means. Thus, those winding points in which the upstream thread guiding means require a relatively strong deflection of the incoming thread can be formed by a freely rotatable or driven deflection roller. In contrast, the thread guide means where relatively low thread looping occur due to the spreading of the sheet of threads, form denführer by stationary held Fa. The combination of freely rotatable (or driven) deflection rolls and stationary thread guides as thread guide means of the winding points thus has the particular advantage that the godet can be kept at a relatively small distance above the winding points. This allows very compact arrangements to be implemented for winding up a group of threads.

The further development of the invention is provided for a godet arranged centrally to the winding points, in which the stationary thread guides form a middle group of the thread guide means and in which the deflection rollers form two outer groups of the thread guide means. Thus, the means distributed on the outer winding points can be guided with relatively large wraps around the thread guide means, in this case the deflection rollers. On the other hand, those in the central area with a much lower degree of wrap around the thread guide are guided by stationary thread guides. Substantially identical thread tensions can thus be realized in each of the winding positions in order to wind the threads onto bobbins.

The distribution of the deflection rollers and the thread guides on the winding points is advantageously determined by an infeed angle, which is set by a thread guide between the thread guide means and the godet. It is thus possible to determine permissible wraps around the thread guide means, which does not lead to any significantly excessive wrap-around friction in the respective thread.

In practice it has been found that the stationary thread guides are assigned to the winding points in which the threads can be guided between the thread guide means and the godet with the infeed angle >20°. The infeed angle is formed denlauf here between a horizontal line connecting the thread guide means and the thread spanned between the respective thread guide means and the godet. In this respect, clear assignments of the thread guide means to the winding points are possible depending on the feed angle. Therefore, the freely rotatable or driven deflection rollers are assigned to the winding points in which the threads can be guided between the thread guide means and the godet with the infeed angle <20°. It has been found that an infeed angle of <20° on the thread guides generates impermissible thread friction, which already leads to different thread tensions when winding the bobbins. These can be avoided by using the freely rotatable or driven deflection rollers.

The device according to the invention for winding up a group of threads is therefore particularly suitable for producing fully drawn threads due to a compact arrangement of the godet. For this purpose, the development of the invention is provided, in which the godet is arranged downstream of a godet group for stretching and relaxing the yarn sheet, which is held by a godet carrier above the machine frame of the winding points, the godet and the godet group being aligned transversely to the winding spindle. This means that very short thread runs can be made with few deflections, and the godet can be kept at a user-friendly working height.

In that regard, the development of the invention is preferably carried out, in which the godet is held at a working height of a maximum of 2 m above an operating gear.

In order to wind a large number of threads into coils within a group of threads, the development of the invention is provided in which the godet is assigned two groups of winding positions which are mirror-symmetrical with identical distribution of the deflection rollers and thread guides in separate machine frames. This means, for example, that 24 or 32 threads can be wound into coils at the same time.

The device according to the invention for winding up a group of threads, in particular in a melt spinning process for the production of synthetic threads, is explained in more detail below using some exemplary embodiments with reference to the accompanying figures.

They represent:

Fig. 1 shows a schematic view of a first exemplary embodiment of the device according to the invention for winding a group of threads Fig. 2 shows a schematic detail of the view of the exemplary embodiment from Fig. 1 Fig. 3 shows a schematic side view of a further exemplary embodiment of the device according to the invention for winding a group of threads Fig. 4 shows a schematic side view of a further exemplary embodiment of the device according to the invention for winding up a sheet of threads. FIG. 5 shows a schematic front view of the exemplary embodiment from FIG

In Fig. 1 is a side view of a first embodiment of the device according to the invention for winding a sheet of threads is shown schematically represents. The exemplary embodiment shows a total of eight winding positions 1.1 to 1.8, which are arranged next to one another in a machine frame 2. The winding positions 1.1 to 1.8 extend along a winding spindle 3.1, which are held in a cantilever manner on a winding turret 9 which is mounted such that it can rotate. In each of the winding positions 1.1 to 1.8, a coil 12 is wound on the circumference of the winding spindle 3.1. For this purpose, the winding spindle 3.1 is driven by a spindle drive 11.1.

For winding a thread into the spool 12, each winding point 1.1 to 1.8 has a traversing unit. The traversing units 5.1 to 5.8 are arranged side by side on the machine frame 2 and each have one or more traversing thread guides, which reciprocate the relevant thread of the winding position 1.1 to 1.8 within a Spu lenwidth. The traversing units 5.1 to 5.8 are assigned a plurality of thread guide means 6.1 to 6.8 at a distance in an upper region of the machine frame 2. The thread guiding means 6.1 to 6.8 together with the traversing units 5.1 to 5.8 arranged underneath each form a so-called traversing triangle, in which the relevant threads are guided back and forth. The thread guiding means 6.1 to 6.8 each form an inlet for the threads to the individual winding points 1.1 to 1.8. The thread guiding means 6.1 to 6.8 are explained in more detail below.

To deposit the threads on the surfaces of the coils 12, a pressure roller 4 is assigned to the traversing units 5.1 to 5.8. The pressure roller 4 is arranged on the machine frame 2 via a movable roller carrier 22 . Here, the pressure roller 4 extends over the entire number of winding spindles

3.1 wound coils 12.

In order to wind the incoming threads into coils as continuously as possible in the winding positions 1.1 to 1.8, a second projecting coil spindle 3.2 is arranged on the winding turret 9. The winding spindle 3.2 is offset by 180° to the winding spindle 3.1 on the winding turret 9. To accommodate the coils 12, the Spulspin spindles 3.1 and 3.2 each have a winding tube 13 per winding station 1.1 to 1.8. The Spulspin del 3.2 is coupled to a spindle drive 11.2. The spool turret 9 can be actively rotated by a turret drive 10 on the machine frame 2 in order to give away the spool spindles 3.1 and 3.2 for a spool change. In this way, the winding spindles 3.1 and 3.2 can be guided alternately into an operating area and a changing area. In FIG. 1, the winding spindle 3.1 is held in the operating range in order to wind incoming threads of a thread sheet 8 into bobbins 12.

The winding positions 1.1 to 1.8 of the device shown in FIG. 1 are used to continuously wind a freshly extruded sheet of threads into coils in a melt spinning process. In such melt spinning processes, the sheet of threads is guided with the aid of godets. So in Fig. 1 is a last godet before the winding points

1.1 to 1.8. In this exemplary embodiment, the godet is referred to as a so-called run-off godet 7, which guides a sheet of threads 8 with partial wrapping around the circumference of a godet jacket. Since the threads of the group of threads 8 are guided to each other on the circumference of the departure Ga lette 7 with a relatively small distance between threads, a spreading and distribution of the threads of the group of threads 8 to the winding positions 1.1 to 1.8 is required. For this purpose, the thread guide means 6.1 to 6.8 of the godet 7 are arranged immediately, so that depending on the position of the thread guide

- 0 - means 6.1 to 6.8 to the run-off godet 7, the threads of the group of threads 8 with different union angles of wrap on the thread guide means 6.1 to 6.8 out who the. In order to allow relatively large wrap angles on the thread guide means 6.1 to 6.8 with a small height difference between the thread guide means 6.1 to 6.8 and the godet 7, the outer thread guide means 6.1 and 6.2 and 6.7 and 6.8 are formed by deflection rollers 14. The middle thread guides 6.3 to 6.6 are formed by stationary thread guides 15. This situation is shown enlarged in FIG.

In the situation shown in FIG. 2, a middle group of the thread guide means 6.3 to 6.6 is formed by a stationary thread guide 15 in each case. The thread guiding means 6.1 and 6.2 as well as 6.7 and 6.8 each form an outer group of thread guiding means, which are designed as deflection rollers 14. At each of the thread guiding means 6.1 to 6.8, one thread of the thread group 8 is guided with un ent loopings. In this exemplary embodiment, the looping of the thread is determined by a feed angle of the threads 8 . The feed angle extends between a horizontal line formed by the thread guide means 6.1 to 6.8 and a piece of thread between the respective thread guide means 6.1 to 6.8 and the run-off godet 7. The feed angles are marked ai to _a8 in this example. Thus, a thread of the group of threads 8 is guided in the winding position 1.1 on the deflection roller 14 of the thread guide means 6.1 with an infeed angle oh. Accordingly, at the winding point 1.2, a thread of the group of threads 8 is guided on the deflection roller 14 of the thread guide means 6.2 with an infeed angle a ₂ .

As can be seen from the illustration in FIG. 2, the inflow angles of the middle group of thread guide means 6.3 to 6.6, which are each formed by the thread guide 15, are identified by the code letters a ₃ to a ₆ . The inflow angles a ₃ to oi ₆ are each greater in magnitude than the inflow angles oh and a ₂ as well as a ₇ and a ₈ in the outer groups of the thread guide means 6.1 and 6.2 and 6.7 and 6.8, which are formed by the deflection rollers 14. The freely rotatable or driven order guide rollers 14 in the outer winding positions 1.1, 1.2, 1.7 and 1.8 thus allow a high thread looping in the feed. In practice, it has been found for the distribution of the deflection rollers 14 and the thread guide 15 that the freely rotatable or driven deflection rollers 14 are assigned to the Wi ckelstellen 1.1 to 1.8, in which the threads between the Fa denführungsmittel 6.1 to 6.8 and the godet 7 with the Inflow angle <20 ° are feasible. Accordingly, for the distribution of the stationary thread guides 15 to the winding positions 1.1 to 1.8, the allocation results that the thread guide means 6.1 to 6.8, on which the threads can be guided with an infeed angle of <20°, are designed as thread guides 15. The distribution of the deflection rollers 14 and the thread guide 15 on the winding points 1.1 to 1.8 is thus essentially dependent on the distance between the godet's 7 and the thread guide means 6.1 to 6.8.

In the embodiment shown in Fig. 1 and 2, the leadership of the yarn sheet 8 is done by the godet 7 in a thread running plane parallel to the Wi ckelstellen 1.1 to 1.8. For this purpose, the godet 7 is aligned parallel to the winding spindle 3.1. In principle, however, it is also possible to guide the sheet of threads in a thread running plane, which is aligned transversely to the winding positions 1.1 to 1.8. An exemplary embodiment is shown in FIG. 3 for this purpose.

In the embodiment shown in Fig. 3, the godet 7 is aligned transversely to the winding spindle 3.1. Thus, 8 different runoff points are generated on the circumference of the runoff godet 7 when the sheet of threads are spread out on each of the threads of the sheet of threads. However, the feed angles OM to a ₃ on the thread guiding means 6.1 to 6.8 remain unchanged. In this respect, the embodiment of Fig.

3 is identical to the exemplary embodiment according to FIG. 2 except for the arrangement of the godet 7. In order to avoid repetition, reference is therefore made to the previous description.

The particular advantage of the exemplary embodiments of the device according to the invention shown in FIGS. 1 and 3 is that the godet 7 can be arranged at a working height that is accessible to an operator. The working height A is shown in FIG. 3 as an example. For ease of use, the godet 7 can be easily installed at a working height of max. 2 m above a service course 23 arrange. The run-off galette 7 can advantageously be arranged firmly on a Ga lettenträger. In this respect, the device according to the invention for winding up a group of threads is preferably suitable for winding completely drawn threads into spools in a melt-spinning process.

For this purpose, a further embodiment of the inventive Shen device is shown schematically in Fig. 4 and 5 in several views. In Fig. 4, the Ausfüh is shown for example in a side view and in Fig. 5 in a front view. Insofar as no express reference is made to one of the figures, the following description applies to both figures.

As can be seen from the illustration in FIG. 5, a group of threads 8 with a large number of threads is wound through two groups of winding positions 1.1 to 1.12 and 1.1' to 1.12' to form spools 12 and 12'. The winding positions 1.1 to 1.12 are in a first machine frame 2 and the winding positions 1.1' to 1.12' in a mirror-symmetrical second machine frame 2'. arranged next to each other. The machine frames le 2 and 2 'are identical to each other and formed only mirror-symmetrical with their devices. Each machine frame 2, 2' has two winding spindles and one winding turret. The winding points 1.1 to 1.12 and 1.1' to 1.12' are each identical to the above-mentioned exemplary embodiments according to FIGS. 1 and 3, so that no further explanation is given at this point. The machine frames 2 and 2 'are arranged below a frame 24 at. The frame 24 carries the godet carrier 17 with a godet group 16 which are driven by godet drives 20 . The godet group 16 is formed by several individually driven godets 16.1 to 16.5.

A side view of the godet group 16 and the winding points 1.1 to 1.12 is shown schematically in FIG. The galette group 16 includes, in addition to the discharge ga lette 7, five further galettes 16.1 to 16.5, which are designed to be heated for stretching and relaxing the group of faculties. A wetting agent 18 and a swirling device 19 are arranged in the thread path between the godet group 16 and the godet 7 in order to create a thread cohesion on the multifilament threads of the thread group 8 in each case to manufacture. Then the threads of the group of threads are distributed in two groups to the winding positions 1.1 to 1.12 and the winding positions 1.1' to 1.12', not shown here. The thread guides 6.1 to 6.12 and 6.1' to 6.12' assigned to the winding positions 1.1 to 1.12 and 1.1' to 1.12' are formed partly by deflection rollers 14 and partly by thread guides 15.

As can be seen from the illustration in FIG. 4, the outer thread guide means 6.1 to 6.3 and 6.10 to 6.12 each form two outer groups, each of which is formed by guide rollers 14 in order. The thread guide means 6.4 to 6.9 represent a middle group, which are each formed by thread guides 15. The mirror-symmetrically opposite thread guide means 6.1 to 6.12' have the identical distribution of the deflection rollers 14 and the thread guide 15. U-shaped ceramic guides or pigtail thread guides are preferably used as stationary thread guides 15 . The freely rotatable or driven deflection rollers 14, on the other hand, preferably have a circumferential thread guide groove in order to deflect the threads with as little friction as possible.

In the illustrated exemplary embodiments according to FIGS. 1 to 5, the number of winding points and the distribution of the thread guide means in the winding points with thread guide and deflection rollers are exemplary. In principle, however, there is the possi probability of dividing the thread guide means into two groups depending on the position of the godet. Thus, in the case of an off-centre godet, a front group of thread guides could be formed by thread guides and a rear group of thread guides by deflection rollers. What is important here is the flow of the threads from the run-off godet to the winding points and the infeed angle that is set.

Claims

patent claims

1. Device for winding a sheet of threads, in particular in a melt spinning process for the production of synthetic threads with several winding points (1.1 - 1.8), which are arranged in a machine frame (2) along a winding spindle (3.1), each of the winding points d.1 - 1.8 ) a traversing unit (5.1

- 5.8) for laying one of the threads onto a respective spool, one of several thread guiding means (6.1 - 6.8) for separating the thread sheet being assigned to each of the traversing units (5.1 - 5.8) and the thread sheet being guided by the thread guiding means (6.1 - 6.8 ) is supplied by at least one godet (7), characterized in that the thread guide means (6.1 - 6.8) distributed over the winding points (1.1 - 1.8) are formed partly by deflection rollers (14) and partly by stationary thread guides (15).

2. Device according to claim 1, characterized in that in the case of a run-off godet (7) arranged centrally to the winding positions (1.1 - 1.8), the stationary thread guides (15) have a middle group of thread guide means (6.1

- Form 6.8) and the deflection rollers (14) form two outer groups of thread guides (6.1 - 6.8).

3. Device according to claim 1 or 2, characterized in that the distribution of the deflection rollers (14) and the thread guide (15) on the winding positions (1.1 - 1.8) is determined by an infeed angle ( ), which is determined by a thread guide between the Thread guide means (6.1 - 6.8) and the departure ga lette (7) adjusts.

4. The device according to claim 3, characterized in that the stationary thread guides (15) are assigned to the winding points (1.1 - 1.8) at which the threads between the thread guide means (6.1 - 6.8) and the godet (7) with the infeed angle (a ) > 20° can be guided.

5. The device according to claim 3, characterized in that the deflection rollers (15) are assigned to the winding points (1.1 - 1.8) at which the threads between the thread guide means (6.1 - 6.8) and the godet (7) with the infeed angle (a) < 20° can be guided.

6. Device according to one of claims 1 to 5, characterized in that the run-off godet (7) is arranged downstream of a godet group (16) for stretching and relaxing the group of threads, which by a godet carrier (17) above the machine frame (2) of the winding positions ( 1.1 - 1.8) are held, the run-off godet (7) and the godet group (16) being aligned transversely to the winding spindle (3.1).

7. Device according to claim 6, characterized in that the godet (7) is held at a working height (A) of max. 2 m above a service aisle (23).

8. Device according to one of Claims 1 to 7, characterized in that two groups of winding points (1.1 - 1.12, 1.1' - 1.12') are assigned to the run-off godet (7), which are mirror-symmetrical with identical distribution of the order guide rollers (14 ) and thread guides (15) in separate machine frames (2, 2 ') opposite.

9. Device according to one of claims 1 to 8, characterized in that the deflection rollers (14) are freely rotatable.

10. Device according to one of claims 1 to 8, characterized in that the deflection rollers (12) are driven.