CN114341038B

CN114341038B - Yarn laying device

Info

Publication number: CN114341038B
Application number: CN202080061465.1A
Authority: CN
Inventors: T·维卡拉
Original assignee: Oerlikon Textile GmbH and Co KG
Current assignee: Oerlikon Textile GmbH and Co KG
Priority date: 2019-09-03
Filing date: 2020-08-21
Publication date: 2024-06-14
Anticipated expiration: 2040-08-21
Also published as: CN114341038A; WO2021043600A1

Abstract

The invention relates to a device for laying yarn to wind a bobbin. The device has a yarn guide (1) which is held on a belt (2.1) of a belt drive (2) which is driven in a reciprocating manner, the yarn guide (1) being movable back and forth within a laying stroke by means of the belt. The aim of the invention is to allow a yarn guiding mechanism (1) to achieve a desired rapid stroke reversal. According to the invention, the yarn guiding mechanism (1) has individual guiding edges (1.1, 1.2) on which the yarn (8) can be alternately guided for each direction of movement of the yarn laying process, wherein the yarn guiding mechanism (3) is provided, which extends along the yarn laying path and cooperates with the yarn guiding mechanism (1) for the purpose of laying the yarn (8).

Description

Yarn laying device

Technical Field

The present invention relates to a device for laying yarn to wind a bobbin.

Background

In yarn processing during synthetic yarn melt spinning production or texturing, the yarn is typically wound into bobbins for storage at the end of the process. For this purpose, the yarn is guided in a reciprocating manner within the bobbin width of the bobbin to be wound, so that a cross-winding pattern is obtained to form the bobbin. The cabling used for this takes place in a reciprocating manner within the width of the bobbin, so that a cylindrical or biconical cross-wound bobbin is produced. Two yarn laying devices are inherently different in the prior art, for example from EP0921087A2.

As disclosed in the known publications, in a first variant, the yarn is guided in a reciprocating manner within a yarn laying stroke by two yarn guiding mechanisms driven in opposite directions to each other. The yarn guiding mechanism is here formed by a plurality of blades which are fastened to one rotor and cooperate with another rotor with a corresponding number of blades. The rotary members are driven in opposite directions to each other, wherein the yarn is guided in an alternating manner over a yarn linear scale (THREAD STRAIGHTEDGE) by one of the blades. Such a yarn laying device is particularly suitable for relatively high laying speeds. However, the device has the disadvantage in principle that the yarn guide mechanisms move in opposite directions with respect to the convergence of the yarn guide mechanisms at the end of the laying stroke, and must be adapted to each other in order to avoid uncontrolled guiding of the yarn.

In addition, a plurality of drive mechanisms are required for guiding the yarn in the laying stroke.

In contrast, a second variant of a yarn laying device is known in which the yarn guiding mechanism is driven in a reciprocating manner by a belt drive. The yarn is held in the yarn guide and guided in a reciprocating manner within the width of the bobbin by the yarn guide. Such a device is distinguished in particular by a high degree of flexibility in guiding the yarn and controlling the yarn laying speed. However, a disadvantage of such a device with a yarn guiding mechanism driven in a reciprocating manner is that the reverse reversal of the yarn laying action necessarily occurs at the end of the yarn laying stroke. For this purpose, a deceleration and reverse reversal of the yarn guiding mechanism is required. However, due to the inertia of such yarn guiding mechanisms, these known devices can only be used in a limited manner for relatively high yarn laying speeds. More yarn is laid in the braking and acceleration phases, especially during the row Cheng Fanzhuai, which is associated with the risk of the yarn loop collapsing at the end of the winding bobbin.

Disclosure of Invention

The invention now results from the last-mentioned variant of the laying device, since the latter has a higher flexibility with respect to the shaping of the bobbins.

In this respect, the object of the invention is now to provide a yarn laying device of this type, in which a desired rapid reversal of the travel is achieved by the yarn guiding mechanism.

Another object of the invention is to improve a yarn laying device of this type in such a way that a perfectly uniform yarn quantity can be laid during the row Cheng Fanzhuai without collapse of the yarn loops.

According to the invention, this object is achieved in that a yarn linear scale is provided which extends along the laying stroke and interacts with a yarn guiding mechanism for the laying of the yarn, wherein the yarn guiding mechanism has a separate guiding edge for each direction of movement of the yarn laying action, on which guiding edge the yarn can be guided alternately.

The invention has the special advantage that the reversal of the thread guiding mechanism can take place independently of the reversal of the thread path. The yarn is then guided in the direction of movement by a separate guiding edge on the yarn guiding mechanism which interacts with the yarn linear scale. The yarn then slides along the yarn linear scale and is displaced by the respective guiding edge of the yarn guiding mechanism. No fixation of the yarn in the yarn guiding mechanism takes place anymore. The yarn can then be guided freely.

In order to obtain a modified guide edge for automatically guiding the thread onto the thread guiding mechanism during the reversal of the path of the thread guiding mechanism, a development of the invention is preferably realized in which the thread guiding mechanism is pivotably arranged on a support held on the belt such that the guide edges of the thread guiding mechanism move against each other against the thread linear scale during the reversal of the path, wherein the guide edge guiding the thread is lowered onto the thread linear scale and the thread is released. In this case, in the braking phase of the yarn guiding mechanism, the inertia of the yarn guiding mechanism is advantageously used to obtain a pivoting of the yarn guiding mechanism such that the guiding edge guiding the yarn is lowered to the yarn linear scale. As a result of which the guiding mechanism can release the yarn. The yarn can be turned around automatically in relation to the direction of movement of the yarn due to the yarn tension towards the centre of the bobbin when the yarn is released. The yarn then performs a very rapid reversal, which is independent of the reversal of the travel of the yarn guide.

In order to achieve the yarn guidance, a further development of the invention is provided in which the yarn guide has a sliding edge on the upper side, which extends between the guiding edges arranged laterally on the yarn guide. Thus, the yarn can be guided along the sliding edge of the yarn guiding mechanism towards the opposite guiding edge, which extends over the yarn linear scale and captures the yarn for guiding the yarn due to the pivoting movement of the yarn guiding mechanism.

But alternatively the shape of the linear scale of the yarn may be used to disengage the yarn from the respective guiding edge of the yarn guiding mechanism at the end of the stroke. According to an advantageous development of the invention, the yarn linear scale is then assigned a scraping bevel in the travel reversal region of the yarn guide, whereby the yarn can be guided on the yarn guide during the travel reversal. The yarn may then be erased from the leading edge of the yarn guiding mechanism, such that the opposite guiding edge on the yarn guiding mechanism takes the yarn and guides it after the direction has been reversed.

In order to be able to wind, for example, a double-cone bobbin, a development of the invention is provided in which the scraping bevel is embodied in an adjustable manner with respect to its position along the linear yarn scale. The yarn reversal can then be changed with respect to its position within the width of the bobbin. So-called throughput during yarn laying is then also possible.

Because this adjustment is ideally integrated into the winding program, the scraping ramp is assigned a controllable actuation drive mechanism for changing the position of the scraping ramp. Thus, a predetermined stroke variation of the yarn laying stroke may be performed.

For a reliable guidance of the yarn guiding mechanism during yarn laying, the belt is preferably guided by guide rollers and a drive wheel, wherein the drive wheel is coupled to the stepper motor. The yarn guiding mechanism can thus be controlled in such a way that it reciprocates at different laying speeds within one yarn laying stroke.

Drawings

The invention will be explained in more detail below by means of a number of embodiments and with reference to the drawings, in which:

fig. 1 schematically shows a side view of a first embodiment of a yarn laying device according to the invention;

FIG. 2 schematically illustrates a plan view of the embodiment of FIG. 1;

Figures 3.1 to 3.3 show different operating conditions of the yarn guiding mechanism of the embodiment of figures 1 and 2; and

Fig. 4.1 to 4.3 show different operating conditions of a yarn guiding mechanism of a further embodiment of a yarn laying device according to the invention.

Detailed Description

A first embodiment of the device according to the invention for laying yarn to wind a bobbin is schematically shown in several views in fig. 1 and 2. This embodiment is shown in a side view in fig. 1 and in a plan view in fig. 2. The following description applies to both figures unless one of them is explicitly mentioned.

The embodiment for laying yarn has a yarn guiding mechanism 1 which is driven in a reciprocating manner by a belt drive 2. For this purpose, the belt drive 2 has an endless belt 2.1 which is guided by guide rollers 2.2 and 2.3 which face one another and a drive wheel 2.4. The drive wheel 2.4 is driven by a stepper motor 2.5. The yarn linear scale 3 is arranged in the section of the belt 2.1 between the guide rolls 2.2, 2.3. The yarn linear scale 3 extends substantially parallel to the belt 2.1 and interacts with the yarn guide 1 for the yarn laying. The yarn guiding mechanism 1 has a guiding edge 1.1, 1.2 for the yarn to be laid on opposite sides. The guiding edges 1.1 and 1.2 of the yarn guiding mechanism 1 are aligned in such a way that they protrude transversely to the yarn linear scale 3 and from the upper side of the yarn linear scale 3. In this connection, the yarn guided in contact on the yarn linear scale 3 is displaced along the yarn linear scale 3 by the guiding edges 1.1, 1.2. The yarn guiding mechanism 1 thus has separate guiding edges 1.1, 1.2 for each direction of movement of the yarn laying action. The guiding edge 1.1 then acts when the yarn guiding mechanism 1 is moved to the left, and the guiding edge 1.2 acts when the yarn guiding mechanism 1 is moved to the right.

In the travel reversal region of the yarn laying travel, the yarn linear scale 3 is assigned a plurality of scraping ramps 4.1 and 4.2. The scraping ramps 4.1 and 4.2 each have a ramp-like sliding surface 4.3 which is held with its lower end at or slightly below the level of the yarn linear scale 3. The scraping ramps 4.1 and 4.2 are positioned such that the yarn guide is lifted on the guiding edge 1.1 or 1.2 of the yarn guide by the yarn linear scale 3 and guided along the guiding edge 1.1 or 1.2 to the free end of the yarn guide 1.

Reference will also be made to fig. 3.1 to 3.3 to explain the functioning of the scraping inclined surfaces 4.1, 4.2.

Fig. 3.1 to 3.3 show the situation when the yarn is laid during the reversal of the stroke of the yarn guiding mechanism. Fig. 3.1 shows the yarn guiding mechanism 1 when the stroke reversal is about to be reached. Fig. 3.2 shows the yarn guiding mechanism 1 during the course reversal, and fig. 3.3 shows the yarn guiding mechanism 1 after the course Cheng Fanzhuai.

As shown in the views of fig. 3.1 to 3.3, the yarn 8 is first guided along the yarn linear scale 3 by means of the guide edge 1.1 of the yarn guiding mechanism 1. When reaching the scraping ramp 4.1 and as the yarn guiding mechanism 1 continues to move, the yarn 8 is displaced upwards on the guiding edge 1.1 until the yarn 8 has reached the free end of the yarn guiding mechanism 1. Once the free end of the yarn guide 1 is reached, the yarn 8 is turned around in its direction of movement in an automatic manner, which is caused by the yarn tension directed towards the centre of the bobbin. Independently of this, the yarn guiding mechanism 1 is decelerated by the belt 2.1 and accelerated in the opposite direction. This situation is shown in fig. 3.2.

Once the yarn guiding mechanism 1 is guided in reverse, the yarn 8 is contacted by the guiding edge 1.2 and guided in reverse along the yarn linear scale 3. In this connection, a relatively rapid yarn reversal occurs, in which the yarn 8 changes its direction of movement in an automatic manner and independently of the yarn guiding mechanism 1. The yarn mass laid on the circumference of the bobbin during the row Cheng Fanzhuai is thus independent of the deceleration and acceleration of the yarn guiding mechanism 1.

In the device shown in fig. 1 and 2, the scraping inclined surfaces 4.1, 4.2 are assigned controllable actuation drive mechanisms 5.1, 5.2. The stroke reversal position and thus the length of the yarn laying stroke can be adjusted by actuating the drive means 5.1, 5.2. On the one hand, the double cone bobbin can then be realized, for example, by continuously shortening the yarn laying stroke, or the so-called throughput can be realized by lengthening or shortening the yarn laying stroke during the yarn laying action.

In order to achieve a yarn change on the leading edges 1.1, 1.2 of the yarn guiding mechanism 1 during the course of the reversal of the stroke, a further embodiment of the device according to the invention is schematically shown in several operating conditions of fig. 4.1 to 4.3 in partial views of the yarn guiding mechanism. The embodiment according to fig. 4.1 to 4.3 is identical to the previous embodiment according to fig. 1 and 2 with regard to the design of the belt drive, so that reference is made in this respect to the previous description.

In the embodiment shown in fig. 4.1 to 4.3, the yarn guiding mechanism 1 is pivotably held on the support 6. The support 6 is connected to the belt 2.1 of the belt drive 2. The yarn guiding mechanism 1 is coupled to the support 6 by means of a pivot 7 and pivoted in the direction of movement only by the inertial force of the yarn guiding mechanism 1. For this purpose, the pivot 7 is aligned transversely to the direction of movement of the yarn guide mechanism 1. The direction of movement of the yarn guiding mechanism 1 is indicated by an arrow.

The yarn guiding mechanism 1 interacts with a yarn linear scale 3 extending along the yarn laying stroke in parallel to the belt 2.1. The belt 2.1 shown in fig. 4.1 to 4.3 is partially between the guide rollers 2.2, 2.3, as shown in the exemplary embodiment according to fig. 1.

The yarn guiding mechanism 1 has guiding edges 1.1, 1.2 on either side. The guiding edges 1.1, 1.2 on the yarn guiding mechanism 1 are realized in such a way that they are opposite to each other and are delimited by sliding edges 1.3 extending on the upper side of the yarn guiding mechanism 1.

In the operating condition shown in fig. 4.1, the yarn 8 is guided along the yarn linear scale 3 on the guide edge 1.1.

In case of a reversal of the travel to the laying travel, the support 6 is decelerated from the laying speed by the belt 2.1 to allow the direction to be reversed. In this case, the pivoting in terms of the temporary movement direction is performed due to the inertia of the yarn guiding mechanism 1. The guiding edges 1.1, 1.2 are moved in opposite directions relative to each other in this case relative to the yarn linear scale 3, so that the guiding edge 1.1 guiding the yarn is lowered below the yarn linear scale 3, while the guiding edge 1.2 capturing the yarn pops up at the yarn linear scale 3. This situation is shown in fig. 4.2. Once the guiding edge 1.1 has fallen to the yarn linear scale 3, the yarn 8 is released and guided in the opposite direction due to the acting yarn tension. The yarn 8 slides here along the sliding edge 1.3 on the upper side of the yarn guiding mechanism 1 when the self-guiding edge 1.1 is disengaged, and is thus guided to the opposite guiding edge 1.2.

Fig. 4.3 shows the situation in which the yarn guiding mechanism 1 has reversed its direction of movement and is guided in opposite directions to each other by means of the belt 2.1. The yarn 8 is guided here along the yarn linear scale 3 by the guide edge 1.2.

The embodiment of the device according to the invention shown in fig. 4.1 to 4.3 has the advantage that the yarn laying stroke length and thus the stroke reversal area can be determined solely by the belt drive 2. The yarn release and take-up in the reversal of the travel between the guide edges 1.1, 1.2 takes place without any further auxiliary means. The length of the laying stroke can thus be varied in a variable manner by the belt drive 2 during winding of the reel. Furthermore, a plurality of yarn guides can also be arranged on the belt of the belt drive, for example, in order to simultaneously guide the yarns at a plurality of winding positions during the winding of the bobbins.

Claims

1. Device for laying a yarn to wind a bobbin, with a yarn guiding mechanism (1), which yarn guiding mechanism (1) is held on a belt (2.1) of a reciprocally driven belt drive (2), by means of which the yarn guiding mechanism (1) can be guided in a reciprocally moving manner within a yarn laying stroke, characterized in that a yarn linear scale (3) is provided, which yarn linear scale (3) extends along the yarn laying stroke and cooperates with the yarn guiding mechanism (1) for laying the yarn (8), wherein the yarn guiding mechanism (1) has separate guiding edges (1.1, 1.2) for each direction of movement of the laying action, which yarn (8) can be alternately guided on the guiding edges (1.1, 1.2), characterized in that the yarn guiding mechanism (1) is pivotably arranged on a support (6) held on the belt (2.1), such that the yarn guiding mechanism (1) moves linearly along the yarn guiding edges (1.1, 1) counter-to each other and the yarn guiding edges (1.1, 1.2) are moved linearly down against each other, wherein the yarn guiding edges (1.1.1.2) are moved linearly.

2. The device according to claim 1, characterized in that the yarn guiding means (1) has a sliding edge (1.3) on the upper side, which sliding edge (1.3) extends between lateral guiding edges (1.1, 1.2) arranged on the yarn guiding means (1).

3. The device according to claim 1, characterized in that the belt (2.1) is guided by means of guide rollers (2.2, 2.3) and a drive wheel (2.4), wherein the drive wheel (2.4) is coupled to a stepper motor (2.5).