EP4122859A1 - Yarn tensioner, work station and method - Google Patents

Abstract

The present invention relates to a yarn tensioner (10) for a work station (1) of a textile machine, preferably a winding machine, which is used to rewind a yarn (2) from a first tube (3), in particular a spinning tube, onto a second tube (4), in particular a bobbin tube, the yarn tensioner (10) having a tensioning device (11) for regulating the yarn tension of a moving yarn (2), the yarn tensioner (10) comprising a first drive (16) with the aid of which the tensioning device (11) the yarn tension generated can be regulated, the yarn tensioner (10) comprising a pre-cleaner (19) for eliminating, retaining or dissolving defined yarn defects, and the pre-cleaner (19) having a passage opening (20) for the yarn (2). It is proposed that the yarn tensioner (10) includes a second drive (21), with the help of which the shape and/or size of the passage opening (20) can be changed if necessary. The invention also relates to a work station (1) of a textile machine with such a yarn tensioner (10) and a corresponding method for influencing a moving yarn (2) at a work station (1) of a textile machine.

Description

The present invention relates to a yarn tensioner for a work station of a textile machine, preferably a winding machine, which serves to rewind a yarn from a first tube, in particular a spinning tube, onto a second tube, in particular a bobbin tube, the yarn tensioner having a tensioning device for regulating the yarn tension of a moving yarn, wherein the yarn tensioner comprises a first drive, with the aid of which the yarn tension generated by the tensioning device can be regulated, wherein the yarn tensioner comprises a pre-cleaner for eliminating, retaining or dissolving defined yarn defects, and wherein the pre-cleaner has a passage opening for the yarn . The invention also relates to a workstation of a textile machine, preferably a winding machine, which serves to rewind a yarn from a first tube, in particular a spinning tube, onto a second tube, in particular a bobbin tube, the workstation having a yarn tensioner. The invention also relates to a method for influencing a moving yarn at a work station of a textile machine, preferably a winding machine, with the aid of which the yarn is rewound from a first tube, preferably a spinning tube, onto a second tube, preferably a winding tube. Here, the yarn passes through a passage opening for the yarn-having pre-cleaner, with the help of which defined yarn defects are eliminated, held back or resolved. In addition, after passing the precleaner, the yarn passes through a tensioning device with a first drive, with the aid of which the yarn tension of the yarn is regulated.

Yarn tensioners of this type, jobs with yarn tensioners and methods for influencing a moving yarn have long been known. Yarn tensioners are used especially on winding machines that wind a yarn from a spinning tube, which is supplied, for example, by a spinning machine, onto a spool or a winding tube Regulate yarn when rewinding. If the yarn tension is too low, winding errors can occur on the bobbin, for example, or loops can form or the yarn can break.

It can also happen that when the yarn is pulled off the first tube at high speeds, individual loops or accumulations of loops form, which are transported as a package in the direction of the yarn tensioner. Without suitable measures to unravel such loops, a large number of problems can arise in the winding machine. A pre-cleaner with a defined passage opening can resolve such yarn defects before they enter the yarn tensioner. However, the precleaners of known yarn tensioners have the disadvantage that the passage opening cannot be changed, only by hand and/or only together with the tensioning device. Therefore, such precleaners cannot be adapted to changing conditions on the textile machine, or can only be adapted with difficulty.

The object of the present invention is to overcome the described disadvantages of known yarn tensioners.

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

The yarn tensioner according to the invention for a work station of a textile machine, preferably a winding machine, which serves to rewind a yarn from a first tube, in particular a spinning tube, onto a second tube, in particular a winding tube, has a tensioning device for regulating the yarn tension of a moving yarn . In addition, the yarn tensioner includes a first drive, with the help of which the yarn tension generated by the tensioning device can be regulated, and a pre-cleaner for eliminating, retaining or dissolving defined yarn defects, wherein the precleaner has a passage opening for the yarn. It is proposed that the yarn tensioner includes a second drive, with the help of which the shape and/or size of the passage opening can be changed if necessary.

With the second drive, the pre-cleaner can be adapted to changed conditions on the textile machine. In addition, the pre-cleaner can be changed independently of the clamping device. This means that the yarn tension and the clearer properties of the pre-cleaner can be controlled independently of one another and, for example, adapted to the properties of the yarn that is being rewound. The shape and/or the size of the through-opening of the pre-cleaner determine, for example, which yarn faults are detected by the pre-cleaner or which loads are exerted on the yarn by the pre-cleaner. An individual setting of the pre-cleaner can therefore have a positive effect on the yarn quality of the rewound yarn.

There are also advantages if the tensioning device comprises a first tensioning element and a second tensioning element, with the first tensioning element and the second tensioning element being movable relative to one another with the aid of the first drive in order to thereby increase the yarn tension between the first tensioning element and the second Tensioner element to regulate moving yarn. The yarn tension can be set very precisely by the first and second tensioning element.

Preferably, the first tensioning element and the second tensioning element have elements that engage in one another like a comb. These elements are, for example, rod-shaped or bar-shaped. Comb-like interlocking means, for example, that the elements do interlock in a form-fitting manner, but there is still a gap for the yarn to pass through. The friction on the yarn tensioner and thus the yarn tension is controlled in particular by the fact that depending on Position of the first tensioning element and the second tensioning element to one another, a mutual pressure of the elements on the yarn is increased or decreased, or by the relative position of the elements to one another, the wrap angle is changed. For example, the elements may have rounded edges to avoid damaging the yarn.

The first drive can be designed, for example, to move both the first tensioning element and the second tensioning element. However, preferably only one of the tensioning elements can be moved by the first drive. The relative position of the tensioning elements is then exclusively determined by the movement of one of the tensioning elements. The drive is designed in particular to move the tensioner elements linearly relative to one another. It is conceivable that a first drive is provided for the first tensioning element and a further first drive for the second tensioning element.

It is particularly advantageous if the first tensioning element and the second tensioning element each have a plurality of tensioning sections which are preferably arranged alternately with respect to one another and jointly define a yarn path for the yarn. As a result, the tensioner sections can, for example, be serviced independently of one another or replaced as wearing parts. The tensioner sections can also form independent elastic units, for example. As already described, the elements of the tensioner sections preferably interlock in a comb-like manner. A pressure that is exerted on the yarn on both sides, or an angle of wrap of the yarn, controls the friction on the tensioner sections and thus the yarn tension.

The tensioner sections of the first tensioner element and the tensioner sections of the second tensioner element are preferably arranged parallel to one another. As a result, the yarn path or the width of the yarn path can be changed linearly when the tensioner elements move relative to one another. For example, the first tensioner element and the second tensioner element each have two tensioner sections. The tensioner sections each have, for example, several of the elements already described. In particular, each stretcher section has three elements.

It is also advantageous if the pre-cleaner has a first retaining element and a second retaining element, the first retaining element and the second retaining element being movable relative to one another with the aid of the second drive. The passage opening can be precisely defined by the first retaining element and the second retaining element. The size of the passage opening is defined, for example, by the edges of the retaining elements. The retaining elements can, for example, at least partially overlap. Here, the retaining elements are, for example, offset and arranged one above the other.

The passage opening can be composed, for example, of a first recess in the first retaining element and a second recess in the second retaining element. On the other hand, the passage opening can also be provided by a recess on only one of the retaining elements. The size of the passage opening can be changed by a relative movement of the retaining elements. The shape of the through-opening can also be changed, for example by an asymmetrical design of the two recesses described and/or by designing the through-opening with different shaped sections that are blocked or released by a relative movement of the retaining elements.

The second drive can be designed, for example, to move both the first retaining element and the second retaining element. Preferably but only one of the retaining elements can be moved by the second drive. The relative position of the retaining elements is then exclusively determined by the movement of one of the retaining elements. The drive is designed in particular to move the retaining elements linearly relative to one another. It is conceivable that a second drive is provided for the first retaining element and a further second drive for the second retaining element.

It is also advantageous if the first drive and/or the second drive are designed as an electric motor, preferably as a stepper motor, as an electromagnetic drive or as a pneumatic drive. As a rule, these drives can be controlled very precisely, which means that with these drives an exact setting of the clamping device or the pre-cleaner is possible. Advantageously, the travel paths of these drives are regulated by a controller and possibly by a corresponding sensor system. The first drive and the second drive are preferably regulated independently of one another. It is also conceivable that the first drive and/or the second drive are designed as hydraulic drives. An electromagnetic drive can include a magnetic coil system, for example. The first and/or the second drive are preferably designed to execute a linear movement.

It is advantageous if the first drive and the second drive are designed in the same way. Above all, this facilitates the control or regulation of the two drives. Equal means in this context, for example, that at least the drive type of the first drive and the second drive is the same. However, the drives can differ, for example, in the maximum travel distances, the increments and/or the power consumption. In particular, the first drive and the second drive can be identical.

It is also advantageous if the first drive and the second drive are attached to a common carrier of the yarn tensioner. In contrast to an independent attachment of the drives, this reduces the number of components for the yarn tensioner and thus the cost of manufacture. A common zero point of the traverse paths can also be defined for the control of the drives. The drives can, for example, be fastened to the carrier in such a way that they at least partially pierce it.

It is also advantageous if the first tensioning element is connected to the carrier directly or with the aid of at least one holding element, and if the second tensioning element is connected to the first drive and can be moved relative to the carrier with its aid. This creates a stable clamping device that can easily withstand even greater loads. A force acting on the first tensioning element is diverted to the carrier. In this case, the relative movement between the tensioning elements occurs, for example, only as a result of the movement of the second tensioning element. The use of the holding element allows greater flexibility in the placement and in a possible later replacement of the first tensioning element.

It is also extremely advantageous if the first retaining element is connected to the carrier directly or with the aid of at least one fixing element, and that the second retaining element is connected to the second drive and can be moved relative to the carrier with its help. Similar to the advantages described above for the tensioner elements, this creates a stable pre-cleaner that can also withstand greater loads. Here, too, the relative movement between the restraining elements arises in this case, for example, only through the movement of the second restraining element. As with the retaining element previously, the fixation element allows greater flexibility in the placement and eventual later replacement of the first retaining element.

The workplace according to the invention of a textile machine, preferably a winding machine, which serves to rewind a yarn from a first tube, in particular a spinning tube, onto a second tube, in particular a winding tube, is characterized by a yarn tensioner as described above. As previously described, the use of the yarn tensioner of the present invention can have a positive impact on the quality of the yarn being rewound at the work site. Above all, the independent adjustment of the clamping device and the pre-cleaner have proven to be advantageous. As already described, the second drive can be used to adapt the pre-cleaner to any yarn defects that may be expected or to the properties of the yarn to be rewound in a simple manner.

In addition to the yarn tensioner, the work station has, for example, a balloon limiter, at least one yarn guide element, a splicer for joining yarn ends, at least one means for finding and grasping a yarn end, in particular in the form of a swiveling suction pipe, and a traversing device, in particular in the form of a grooved roller.

On a textile machine, in particular a winding machine, a large number of such work stations are usually arranged next to one another. The textile machine has, for example, a higher-level controller that controls the operation of the textile machine as a whole. In addition, the respective job can also have a controller that is either subordinate to the higher-level controller or is partially or entirely independent of it. At least one of the controllers mentioned can also be operatively connected to the first and/or second drive and control this/them.

In the method according to the invention for influencing a moving yarn at a work station of a textile machine, preferably a winding machine, with the aid of which the yarn is rewound from a first tube, in particular a spinning tube, onto a second tube, in particular a winding tube, the yarn passes through a a precleaner having a passage opening for the yarn, with the help of which defined yarn defects are eliminated, retained or resolved. After passing through the precleaner, the yarn passes through a tensioning device with a first drive, with the help of which the yarn tension of the yarn is regulated. It is proposed for the method that the shape and/or size of the through-opening is changed, if necessary, with the aid of a second drive. Above all, the workplace according to the invention is suitable for carrying out the method. The advantages already described have analogous validity for the method. The individual setting of the pre-cleaner and the tensioning device enables rewinding with minimum stress on the rewound yarn and maximum cleaning of yarn defects or loops before the passage of the yarn tensioner.

It is also extremely advantageous if the yarn tension is regulated and the shape and/or size of the through-opening is changed independently of one another. Since the yarn tension controlled by the tensioning device is not necessarily related to the yarn defects occurring in front of the yarn tensioner, this enables individual adjustment of the yarn tension on the one hand and individual adjustment of the pre-cleaner to possible yarn defects coming from the first tube on the other.

It is advantageous if the change in the shape and/or size of the passage opening takes place in that a first retaining element of the pre-cleaner is moved relative to a second retaining element of the pre-cleaner with the aid of the second drive. As a result, the pre-cleaner can be designed in a particularly simple and efficient manner. Such a change in the through-opening is also energetically efficient and low-wear. As before described, a change in the shape of the through-opening can take place, for example, by means of different shaped sections that are successively blocked or released. For example, only one of the retaining elements can be moved by the second drive, or both retaining elements can be moved by the second drive.

It is also advantageous if the yarn tension is regulated in that a first tensioning element of the tensioning device and a second tensioning element of the tensioning device are moved relative to one another with the aid of the first drive, with the yarn moving between the first tensioning element and the second tensioning element. As a result, the tensioning device can be designed in a particularly simple and efficient manner. Here, too, there is energy efficiency and low-wear operation. For example, only one of the tensioner elements can be moved by the first drive, or both tensioner elements can be moved by the first drive.

Figur 1

eine schematische Ansicht einer erfindungsgemäßen Arbeitsstelle,

Figur 2

eine schematische Frontansicht eines ersten Ausführungsbeispiels des erfindungsgemäßen Garnspanners, und

Figur 3

eine schematische Draufsicht auf einen Vorreiniger eines zweiten Ausführungsbeispiels des erfindungsgemäßen Garnspanners.

Further advantages of the invention are described in the following exemplary embodiments. It shows:

figure 1

a schematic view of a job according to the invention,

figure 2

a schematic front view of a first embodiment of the yarn tensioner according to the invention, and

figure 3

a schematic plan view of a pre-cleaner of a second embodiment of the yarn tensioner according to the invention.

In the following description of the figures for the different Figures identical and / or at least comparable features used the same reference numerals. 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.

figure 1 shows a job 1 according to the invention of a textile machine, not shown, in particular a winding machine. The job 1 serves to rewind a yarn 2 from a first tube 3 onto a second tube 4. The first tube 3 is designed as a spinning tube. The second tube 4 is designed as a bobbin tube. The first sleeve 3 was wound, for example, by a spinning machine with a yarn 2 spun by this machine. Since a spinning tube can only hold comparatively small amounts of yarn 2, the yarn 2 is wound onto the winding tube from a plurality of spinning tubes. The work station 1 has a splicer 5, for example, for joining yarn 2 from several spinning tubes.

The work station 1 also has, for example, a balloon limiter 6 and a first pivotable suction tube 7 and a second pivotable suction tube 8 . The swiveling suction tubes 7, 8 are used to locate and grip yarn ends on the first sleeve 3 and the second sleeve 4. In addition, the work station 1 has a grooved roller 9, which on the one hand serves to drive the second sleeve 4, for example, and on the other hand the yarn 2 wound up into a cross-wound bobbin.

In order to maintain an even yarn tension, the work station 1 has a yarn tensioner 10 according to the invention. The twine tensioner 10 is in figure 2 in the same view as in figure 1 shown enlarged. The yarn tensioner 10 includes a tensioning device 11 . This has in particular a first tensioning element 12 and a second tensioning element 13 .

The tensioning elements 12, 13 have, in particular, a plurality of tensioning sections 14 which are preferably arranged alternately with respect to one another and together define a yarn path 15 for the yarn 2. The tensioner sections 14 of the tensioner elements 12, 13 interlock, for example, like a comb. The pressure exerted on both sides of the yarn 2 or the friction of the yarn 2 on the tensioner sections 14 determine the yarn tension.

The yarn tensioner 10 has a first drive 16 which is designed to move the first tensioner element 12 and the second tensioner element 13 relative to one another. In this exemplary embodiment, the first drive 16 is exclusively connected to the second tensioning element 13 . Therefore, only the second tensioning element 13 can be moved by the drive 16 . The relative position of the tensioning elements 12 , 13 to one another is determined only by the second tensioning element 13 . The first drive 16 is designed, for example, as an electric motor. The first tensioning element 12 is firmly connected to a carrier 17 of the yarn tensioner 10 . In this exemplary embodiment, the first tensioning element 12 is connected to the carrier 17 via two holding elements 18 .

The yarn tensioner 10 also includes a precleaner 19 which is arranged in front of the tensioning device 11 in the running direction of the yarn 2 . The precleaner 19 has a passage opening 20 for the yarn 2 . The shape and/or the size of the passage opening 20 of the pre-cleaner 19 can be changed with the aid of a second drive 21 . In this specific example, the pre-cleaner 19 has a first retaining element 22 and a second retaining element 23 . The first retaining element 22 and the second retaining element 23 can be moved relative to one another by means of the second drive 21 .

The first retaining element 22 is firmly connected to the carrier 17 . In particular, the first retaining element 22 is connected to the carrier 17 via a fixing element 24 . The second retaining element 23 is connected to the second drive 21, with the help of which it can be moved relative to the carrier 17 is movable. The passage opening 20 can be changed with the aid of this movement. The first drive 16 and the second drive 21 are attached to the carrier 17 . The first drive 16 causes a linear movement of the second tensioning element 13 and the second drive 21 causes a linear movement of the second retaining element 23. The two drives 16, 21 are in particular of the same design.

The structure of the pre-cleaner 19 is in figure 3 shown in more detail in another embodiment. figure 3 Figure 12 shows a top view of the precleaner 19 with the rest of the yarn tensioner 10 hidden. It can be clearly seen how a combined effect of the first retaining element 22 and the second retaining element 23, in particular the relative movement of the two retaining elements 22, 23, influences the size of the passage opening 20. As already described, the first retaining element 22 is firmly connected to the carrier 17 . The relative movement between the retaining elements 22, 23 is caused exclusively by the movement of the second retaining element 23 in this example. The second retaining element 23 is connected to the second drive 21 which in turn is fastened to the carrier 17 .

In this example, the passage opening 20 is formed by a recess in the second retaining element 23 . The size of the passage opening 20 is determined on the one hand by the recess and on the other hand by an edge of the first retaining element 22 and correspondingly by the relative movement of the two retaining elements 22, 23.

The present invention is not limited to the illustrated and described embodiment. 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

first sleeve

4

second sleeve

5

splicer

6

balloon limiter

7

first swiveling suction pipe

8th

second swiveling suction tube

9

grooved roller

10

Yarn Tensioner

11

clamping device

12

first tensioner

13

second tensioner

14

tensioner section

15

yarn path

16

first drive

17

carrier

18

retaining element

19

pre-cleaner

20

passage opening

21

second drive

22

first restraining element

23

second restraining element

24

fixing element

Claims (14)

Yarn tensioner (10) for a work station (1) of a textile machine, preferably a winding machine, which serves to rewind a yarn (2) from a first tube (3), in particular a spinning tube, onto a second tube (4), in particular a winding tube , - wherein the yarn tensioner (10) has a tensioning device (11) for regulating the yarn tension of a moving yarn (2), - wherein the yarn tensioner (10) comprises a first drive (16), with the aid of which the yarn tension generated by the tensioning device (11) can be regulated, - wherein the yarn tensioner (10) comprises a precleaner (19) for eliminating, retaining or dissolving defined yarn defects, and - wherein the precleaner (19) has a passage opening (20) for the yarn (2), characterized,
that the yarn tensioner (10) comprises a second drive (21), with the aid of which the shape and/or size of the passage opening (20) can be changed if necessary. Yarn tensioner (10) according to the preceding claim, characterized in that the tensioning device (11) comprises a first tensioning element (12) and a second tensioning element (13), the first tensioning element (12) and the second tensioning element (13) being first drive (16) are movable relative to each other in order to thereby regulate the yarn tension of the yarn (2) moving between the first tensioning element (12) and the second tensioning element (13). Yarn tensioner (10) according to any one of the preceding claims, characterized in that the first tensioner element (12) and the second tensioning element (13) each have a plurality of tensioning sections (14) which are preferably arranged alternately to one another and together define a yarn path (15) for the yarn (2). Yarn tensioner (10) according to any one of the preceding claims, characterized in that the precleaner (19) has a first retaining element (22) and a second retaining element (23), the first retaining element (22) and the second retaining element (23) being aided of the second drive (21) are movable relative to each other. Yarn tensioner (10) according to one of the preceding claims, characterized in that the first drive (16) and/or the second drive (21) are designed as an electric motor, preferably as a stepping motor, as an electromagnetic drive or as a pneumatic drive. Yarn tensioner (10) according to one of the preceding claims, characterized in that the first drive (16) and the second drive (21) are of identical design. Yarn tensioner (10) according to one of the preceding claims, characterized in that the first drive (16) and the second drive (21) are attached to a common carrier (17) of the yarn tensioner (10). Yarn tensioner (10) according to one of the preceding claims, characterized in that the first tensioner element (12) is connected to the carrier (17) directly or with the aid of at least one holding element (18). is connected, and that the second tensioning element (13) is connected to the first drive (16) and by means of which it can be moved relative to the carrier (17). Yarn tensioner (10) according to one of the preceding claims, characterized in that the first retaining element (22) is connected to the carrier (17) directly or with the aid of at least one fixing element (24), and in that the second retaining element (23) is connected to the second Drive (21) is connected and with the help of which can be moved relative to the carrier (17). Work station (1) of a textile machine, preferably a winding machine, which serves to rewind a yarn (2) from a first tube (3), in particular a spinning tube, onto a second tube (4), in particular a winding tube,
characterized,
that the work station (1) has a yarn tensioner (10) according to one or more of the preceding claims. Method for influencing a moving yarn (2) at a work station (1) of a textile machine, preferably a winding machine, with the aid of which the yarn (2) is drawn from a first tube (3), in particular a spinning tube, onto a second tube (4) , in particular a bobbin tube, is rewound, - wherein the yarn (2) passes through a precleaner (19) which has a passage opening (20) for the yarn (2) and with the aid of which defined yarn defects are eliminated, retained or dissolved, and - the yarn (2), after passing through the precleaner (19), passing through a tensioning device (11) with a first drive (16), with the aid of which the yarn tension of the yarn (2) is regulated, characterized,
that the shape and/or size of the through-opening (20) is changed if necessary with the aid of a second drive (21). Method according to the preceding claim, characterized in that the yarn tension is regulated and the shape and/or size of the passage opening (20) is changed independently of one another. Method according to Claim 11 or 12, characterized in that the change in the shape and/or size of the passage opening (20) takes place in that a first retaining element (22) of the precleaner (19) with the aid of the second drive (21) relative to a second retaining element (23) of the pre-cleaner (19) is moved. Method according to one of claims 11 to 13, characterized in that the yarn tension is regulated in that a first tensioning element (12) of the tensioning device (11) and a second tensioning element (13) of the tensioning device (11) with the aid of the first drive (16 ) are moved relative to one another, with the yarn (2) moving between the first tensioning element (12) and the second tensioning element (13).

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