EP4177203A1 - Yarn tensioner and workstation of a textile machine with a yarn tensioner - Google Patents

Abstract

A yarn tensioner (10) for adjusting a yarn tension of a running yarn (2) with a first tensioning element (12) having at least one first deflection element (14) and with a second tensioning element (13) having at least one second deflection element (15) is designed as a creel tensioner . The first tensioning element (12) and the second tensioning element (13) are arranged opposite one another and can be adjusted relative to one another by means of a translatory adjustment movement in order to set the yarn tension. The first tensioning element (12) and the second tensioning element (13) define a yarn running direction (GR). The at least one first deflection element (14) and the at least one second deflection element (14) are arranged at an acute angle (W) to one another in a direction transverse to the yarn running direction (GR). A work station (1) of a textile machine, preferably a winding machine, has such a yarn tensioner (10).

Description

The present invention relates to a yarn tensioner for a work station of a textile machine, preferably a winding machine, for adjusting a yarn tension of a running yarn. The yarn tensioner includes a first tensioning element having at least one first deflection element and a second tensioning element having at least one second deflection element and is designed as a creel tensioner. The first tensioning element and the second tensioning element are arranged opposite one another and can be adjusted relative to one another by means of a translatory adjustment movement in order to set the yarn tension. The first tensioning element and the second tensioning element define a yarn running direction between them. The invention also relates to a work station of a textile machine, preferably a winding machine, with such a yarn tensioner.

Such yarn tensioners and jobs with such yarn tensioners have been known for a long time and are used on spinning machines, especially ring spinning machines, and winding machines to regulate the tension of the yarn when the yarn is wound onto a bobbin tube. If the yarn tension is too low, winding errors can occur on the bobbin, for example, or loops can form or yarn breaks can occur, while if the yarn tension is too high, increased yarn breaks can occur. The regulation of the yarn tension is therefore of great importance.

From the DE 100 09 611 A1 a yarn tensioner is known, which is designed as a rack tensioner and on the one hand includes stationary and on the other hand adjustable thread tensioning elements over which the thread meanders is led. The stationary thread tensioning elements are arranged on a stationary holder, while the adjustable thread tensioning elements are arranged on a pivoted lever that can be pivoted relative to the stationary holder. By pivoting the pivoting lever, the adjustable thread tensioning elements and the stationary thread tensioning elements change their position relative to one another and thus also the angle of wrap of the running thread with respect to the thread tensioning elements, so that the yarn tension can be adjusted as a result.

From the DE 10 2007 053 466 A1 On the other hand, another embodiment of a yarn tensioner is also known, in which the adjustable thread tensioning elements are not seated on a pivotable lever, but rather on a tensioning arm that can be moved translationally relative to the stationary thread tensioning elements. In the device of DE 10 2007 053 466 A1 a limiting element is also provided, with the help of which the thread can also be clamped.

The yarn tensioners known from the prior art have basically proven themselves. Occasionally, however, the yarn can run unevenly within the yarn tensioner. It is therefore the object of the present invention to improve the running of the thread within the yarn tensioner.

The object is solved by a yarn tensioner and a work station with the features of the independent patent claims.

A yarn tensioner for setting a yarn tension of a running yarn with a first tensioning element having at least one first deflection element and with a second tensioning element having at least one second deflection element is designed as a creel tensioner. The first tensioning element and the second tensioning element are arranged opposite one another and for adjusting the yarn tension by a translatory Adjustment movement adjustable relative to each other. The first tensioning element and the second tensioning element define a yarn running direction between them.

In such a yarn tensioner, it is now provided that the at least one first deflection element and the at least one second deflection element are arranged at an acute angle to one another in a direction transverse to the direction of travel of the yarn.

While in conventional yarn tensioners the opposing deflection elements of the opposing tensioning elements are aligned parallel to one another, the present invention proposes arranging them at a defined, small angle to one another. To put it another way, the deflection elements of the proposed creel tensioner are not arranged in parallel, but slightly crossed relative to one another. If, due to tension differences or other events, there is an unsteady yarn run with lateral deflections of the yarn, i.e. deflections perpendicular to the direction of yarn travel, the yarn experiences a restoring lateral deflection as soon as it hits the slightly obliquely oriented deflection elements. As soon as the yarn tensioner is closed to such an extent that the yarn is in contact with the deflection elements, the yarn is automatically guided into its optimal position within the yarn tensioner by the crossed deflection elements. By arranging the deflection elements at a small angle to one another, an undesired lateral deflection of the yarn is thus limited and smooth yarn travel is achieved.

At a work station of a textile machine, preferably a winding machine, which has such a yarn tensioner, operational interruptions and quality problems when winding the bobbin tube can be avoided by the smooth running of the yarn. The yarn tensioner described can therefore be used advantageously at a work station of a textile machine.

According to an advantageous embodiment of the yarn tensioner, the angle is less than 8°, preferably less than 6° and particularly preferably less than 5°. With such small angles, the yarn can be acted on gently and the desired restoring deflection of the yarn can still be achieved.

According to a particularly advantageous development of the yarn tensioner, the angle is constant over the entire adjustment movement. For this purpose, the two clamping elements of the yarn tensioner can be moved in relation to one another in a purely translatory manner without an additional, superimposed movement. As a result, the device can also be designed in a structurally simple manner and still achieve the advantages of smooth running of the yarn. In principle, however, it is also conceivable for the angle to be variable, for example by means of a further drive.

It is also advantageous if the angle of the deflection elements can be adjusted in relation to one another. For this purpose, it is possible, for example, to arrange the individual deflection elements on the tensioning element in an adjustable manner. According to a simple and preferred embodiment, however, the entire tensioning element is arranged so that it can be adjusted in relation to a carrier of the yarn tensioner.

According to another advantageous development of the yarn tensioner, the at least one first deflection element and/or the at least one second deflection element has a stop element for limiting yarn movement transversely to the yarn running direction. Such a stop element can be designed, for example, as a projection on the deflection element and then also contributes to a smooth and defined yarn run.

It is particularly advantageous if the stop element is arranged in a region of the deflection element that faces an opening in the bracket. In this case, the run-up element limits lateral deviations, i.e. deflections of the yarn transverse to the direction of travel of the yarn, on the open side of the "V" formed by the deflection elements. On the closed side of the "V", however, the lateral deviation or deflection of the yarn is limited solely by the crossed arrangement of the deflection elements. Since only one stop element per deflection element is required to limit the lateral movements of the yarn, the yarn tensioner or the deflection elements of the yarn tensioner can hereby in turn be of simple design. In principle, however, it is also conceivable to also provide an additional contact element on the closed side of the "V", which then limits particularly large deflections of the yarn.

It is also particularly advantageous if a plurality of deflection elements are arranged on the first and/or on the second tensioning element. As a result, a larger angle of wrap of the yarn can be realized at the deflection elements, whereby more friction can be applied and the yarn tension can be adjusted and maintained better.

Another advantageous further development of the yarn tensioner also provides that one of the two tensioning elements is arranged in a stationary manner and the other of the tensioning elements is arranged in an adjustable manner in the yarn tensioner. As a result, only one drive is required and the device can in turn be designed in a structurally simple and operationally reliable manner. However, it is also possible to move both clamping elements during the relative movement of the two clamping elements, which is also possible using a single drive. Furthermore, it is of course also conceivable to move each of the two clamping elements individually by means of its own drive.

Figur 1

eine schematische Vorderansicht einer Arbeitsstelle einer Textilmaschine,

Figur 2

eine schematische, teilweise geschnittene Seitenansicht einer Arbeitsstelle einer Textilmaschine,

Figur 3

eine schematische Vorderansicht eines Garnspanners in einer ersten Stellung,

Figur 4

eine schematische Vorderansicht des Garnspanners der Figur 3 in einer zweiten Stellung

Figur 5

eine schematische Draufsicht auf einen Garnspanner nach einer ersten Ausführung und

Figur 6

eine schematische Draufsicht auf einen Garnspanner nach einer zweiten Ausführung.

Further advantages of the invention are described in the following exemplary embodiments. Show it:

figure 1

a schematic front view of a work station of a textile machine,

figure 2

a schematic, partially sectioned side view of a work station of a textile machine,

figure 3

a schematic front view of a yarn tensioner in a first position,

figure 4

a schematic front view of the yarn tensioner figure 3 in a second position

figure 5

a schematic plan view of a yarn tensioner according to a first embodiment and

figure 6

a schematic plan view of a yarn tensioner according to a second embodiment.

In the following description of the figures, the same reference symbols are used for features that are identical and/or at least comparable in the various figures. The individual features, their design and/or mode of action are usually only explained in detail when they are first mentioned. If individual features are not explained in detail again, their design and/or mode of action corresponds to the design and mode of action of the features already described that have the same effect or have the same name. Furthermore, for reasons of clarity, of several identical components or features, often only one or just a few are labeled.

figure 1 shows a schematic front view of a work station 1 of a textile machine, not shown. Such textile machines usually have a large number of work stations 1 which are arranged next to one another between two frames and at which a yarn 2 is wound onto a winding tube 19 by means of a winding device 4 . The winding device 4 shown here is used for the production of cross-wound bobbins and includes this, among other things a traversing device 9. The traversing device 9 includes a grooved drum in the present example, which also serves as a drive roller for the winding tube 19 and in the grooves of which a yarn guide (not visible here) is guided. However, a direct drive of the winding tube 19 would also be conceivable. The textile machine can be designed as a spinning machine or as a winding machine.

In the figure 1 Work station 1 shown is designed as work station 1 of a winding machine and is used to rewind the yarn 2 from a spinning tube 3 onto the winding tube 19. Many spinning machines such as ring spinning machines produce the yarn 2 on small-volume spinning bobbins that are unsuitable for further processing. It is therefore necessary to rewind the yarn 2 onto large-volume winding tubes 19, in particular cross-wound bobbins, that are suitable for further processing. For example, about 100 yarn cops or spinning tubes 3 are wound onto such a bobbin tube 19 .

For rewinding, the yarn 2 wound on the spinning tube 3 is drawn overhead from the spinning tube 3 and successively passes through a balloon limiter 6 and a yarn tensioner 10 before it is wound onto the winding tube 19 . The yarn tensioner 10 serves to maintain an even yarn tension and exerts an adjustable yarn tension on the running yarn 2 . For this purpose, the yarn tensioner 10 can be controlled accordingly by a control device (not shown) of the work station 1 and/or the textile machine. The yarn 2 passes the yarn tensioner 10 in a yarn running direction GR, as shown in FIG figure 3 will be explained in more detail.

At work station 1, additional work units or thread handling units such as yarn guide elements 20 or yarn clearers 21 (see figure 2 ) inter alia be arranged. Furthermore, a splicer 5 is still arranged at the workplace, which the connection of yarn ends after a Yarn breakage or a clearer cut is used. The splicer has a first pivotable suction tube 7 for finding and gripping a lower or spinning tube-side yarn end and a second pivoting suction tube 8 for finding and gripping a winding tube-side yarn end.

figure 2 shows such a work station 1 of a textile machine in a schematic, partially sectioned side view. The job 1 is also designed as a job 1 of a winding machine. In addition to the yarn guide elements 20, the yarn clearer 21 can now also be seen here. The traversing device 9 includes here different than in the figure 1 a thread guide 23 which is designed separately from the drive roller 22 for the winding device 4. The rest of the design of the job 1 corresponds to that of the figure 1 , so that no further details are given here. Furthermore, in figure 2 nor the yarn tensioner 10 can be seen in a schematic side view. As will be explained in more detail with reference to the following figures, the yarn 2 is guided in the yarn tensioner 10 via a plurality of deflection elements 14, 15 (see Fig. 3 ) guided. By means of the deflection elements 14, 15, friction is applied to the yarn 3 passing through and the yarn tension is thereby adjusted accordingly.

figure 3 shows a detailed view of the yarn tensioner 10 in a schematic front view, which corresponds to the representation of FIG figure 1 is equivalent to. The yarn tensioner 10 is designed in the manner of a creel tensioner and has a first tensioning element 12 and a second tensioning element 13 which are arranged opposite one another in the yarn tensioner 10 and which are movable relative to one another for adjusting the yarn tension. In principle, it is known to move the two clamping elements 12, 13 relative to one another either by a pivoting movement or by a translatory movement. The present invention is concerned with yarn tensioners 10 in which the two tensioning elements 12, 13 can be moved relative to one another by a translational adjustment movement. this is in figure 3 symbolized by a double arrow pointing horizontally.

To generate the adjustment movement, the yarn tensioner 10 has a drive 16 which is connected to at least one of the two tensioning elements 12, 13. In the present case, the drive 16 is only connected to the first tensioning element 12 via a holding element 18 so that only the first tensioning element 12 is adjustably arranged in the yarn tensioner 10 and can be moved by means of the drive 16 . The second tensioning element 13 , on the other hand, is arranged in a stationary manner in the yarn tensioner 10 . In the present case, the second tensioning element 13 is fastened to a carrier 17 of the yarn tensioner 10 by means of two holding elements 18 . The relative position of the clamping elements 12, 13 to one another is thus only determined by the first clamping element 12. The drive 16 is designed in particular as an electric motor.

In the present example, the first tensioning element 12 has a plurality of first deflection elements 14 and the second tensioning element 13 has a plurality of second deflection elements 15 and, with their deflection surfaces 24, define a yarn travel direction GR. For reasons of clarity, only two deflection surfaces are labeled here, but it goes without saying that each of the deflection elements 14 has such a deflection surface 24 . Likewise, the number of deflection elements 14, 15 should only be understood as an example. As a rule, several deflection elements 14, 15 are arranged on each tensioning element 12, 13, since in this way a larger angle of wrap of the yarn 2 (see Fig. figures 1 and 2 ) is achieved on the deflection elements 14, 15, but in principle a yarn tensioner 10 with only one deflection element 14, 15 per tensioning element 12, 13 would also be conceivable.

The tensioning elements 12, 13 are arranged in the yarn tensioner 10 in such a way that the first deflection elements 14 and the second deflection elements 15 are offset from one another with respect to the direction of travel of the yarn GR, so that the deflection elements 14, 15 mesh like a comb during the course of the adjustment movement. In figure 3 the yarn tensioner 10 is shown in a first, fully open position I, in which the yarn 2 (not shown here) runs straight through the yarn tensioner 10 and no deflection experiences the deflection surfaces. The yarn tensioner 10 does not apply any tension to the yarn in this position.

In contrast, shows figure 4 the yarn tensioner 10 in a second position in which it is at least partially closed. For this purpose, the first clamping element 12 was moved relative to the second clamping element 13 by means of the drive 16 . The yarn 2 (not shown here) assumes a meandering course through the yarn tensioner 10 in this position. The yarn running direction GR, on the other hand, denotes only the main direction of the yarn 2 between its entry into the yarn tensioner 10 and its exit from the yarn tensioner 10 and is not changed by the adjustment movement. The yarn tension can be influenced by the multiple deflection of the yarn 2 on the deflection surfaces 24 of the deflection elements 14, 15 and the friction that acts on the yarn 2 as a result.

figure 5 shows a yarn tensioner 10 in a schematic plan view. It can be seen how the two tensioning elements 12, 13 are fastened to the support 17 of the yarn tensioner 10 by means of holding elements 18. It can also be seen that one of the two tensioning elements 12, 13, in the present case the tensioning element 13 shown on the right in the figure, is arranged in a stationary manner on the yarn tensioner 10 or on the carrier 17. It can also be seen that the other tensioning element 12, 13, in the present case the tensioning element 12 shown on the left in the figure, is movably arranged on the yarn tensioner 10 or on the carrier 17 by means of the drive 16. This is in turn symbolized by a double arrow. In the present representation, a first deflection element 14 can also be seen, which is arranged on the first clamping element 12 and a second deflection element 15, which is arranged on the second clamping element 13. In the present top view, only one deflection element 14, 15 can be seen in each case. As already stated, however, in real yarn tensioners 10 are on each of the tensioning elements 12, 13 several deflection elements 14,15 arranged. In the top view shown, the yarn running direction GR runs perpendicularly to the plane of the drawing and is therefore represented by a corresponding symbol.

How now that figure 5 removed, the deflection elements 14, 15 are not parallel to each other, but arranged at an acute angle W to each other. In the present case, this is realized in that the deflection elements 14, 15 are fastened to the holding elements 18 at a corresponding angle, which corresponds to half the angle W. However, it would also be possible to fasten the holding elements 18 to the carrier 17 or the drive 16 at a corresponding angle. This ensures that the running yarn 2 undergoes a defined, lateral deflection in the direction of the opening of the angle W. This is symbolized by an arrow pointing down in the image. As a result, the yarn 2 is held in an optimal, quiet and constant position, and lateral vibrations of the yarn 2 transversely to the yarn running direction GR are reduced.

figure 6 shows another embodiment of a yarn tensioner 10 with such deflection elements 14, 15 arranged at an angle W to one another. In contrast to FIG figure 5 have the deflection elements 14, 15 of figure 6 in their area facing the opening of the angle W each have a stop element 11 . By means of such a stop element 11, lateral deflections of the yarn transverse to the yarn running direction GR can now also be limited in the direction of the opening of the angle W. The stop elements 11 thus also contribute to a particularly constant, defined and smooth running of the yarn. Due to the fact that the deflection elements 14, 15 are arranged at the angle W to one another, no contact element is required in the region of the deflection elements 14, 15 facing the apex of the angle. There, the limitation of the lateral deflection of the yarn 2 can be achieved solely by the deflection due to the inclined position of the deflection elements 14, 15.

The present invention is not limited to the illustrated and described embodiments. Modifications within the scope of the patent claims are just as possible as a combination of features, even if they are shown and described in different exemplary embodiments.

Reference List

1

place of work

2

yarn

3

spinning tube

4

spooling device

5

splicer

6

balloon limiter

7

first swiveling suction pipe

8th

second swiveling suction pipe

9

oscillating device

10

Yarn Tensioner

11

start-up element

12

first clamping element

13

second clamping element

14

first deflection element

15

second deflection element

16

drive

17

carrier

18

holding element

19

bobbin case

20

yarn guide element

21

yarn clearer

22

drive roller

23

thread guide

24

deflection surfaces

GR

yarn direction

W

angle

Claims (9)

Yarn tensioner (10) for setting a yarn tension of a running yarn (2) with a first tensioning element (12) having at least one first deflection element (14) and with a second tensioning element (13) having at least one second deflection element (15), the yarn tensioner (10) being designed as a creel tensioner, the first tensioning element (12) and the second tensioning element (13) being arranged opposite one another and being adjustable relative to one another by means of a translatory adjustment movement in order to adjust the yarn tension and wherein the first tensioning element (12) and the second tensioning element (13) define a yarn running direction (GR), characterized in that that the at least one first deflection element (14) and the at least one second deflection element (14) are arranged at an acute angle (W) to one another in a direction transverse to the yarn running direction (GR). Yarn tensioner (10) according to the preceding claim, characterized in that the angle (W) is less than 8°, preferably less than 6° and particularly preferably less than 5°. Yarn tensioner (10) according to one of the preceding claims, characterized in that the angle (W) is constant over the entire adjustment movement. Yarn tensioner (10) according to one of the preceding claims, characterized in that the angle (W) is adjustable. Yarn tensioner (10) according to one of the preceding claims, characterized in that the at least one first deflection element (14) and/or the at least one second deflection element (15) has a stop element (11) for limiting a yarn movement transversely to the yarn running direction (GR). Yarn tensioner (10) according to one of the preceding claims, characterized in that the stop element (11) is arranged in a region of the deflection element (14, 15) facing an opening of the angle (W). Yarn tensioner (10) according to one of the preceding claims, characterized in that a plurality of deflection elements (14, 15) are arranged on the first and/or on the second tensioning element (12). Yarn tensioner (10) according to one of the preceding claims, characterized in that one of the two tensioning elements (12, 13) is arranged stationary and the other of the tensioning elements (12, 13) is adjustable in the yarn tensioner (10). Work station (1) of a textile machine, preferably a winding machine, with a yarn tensioner (10) according to one or more of the preceding claims.

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