EP3321222B1 - Workstation of a textile machine manufacturing cross-wound packages with a mechanical accumulator arranged in the area of the thread traversing triangle - Google Patents

Description

The invention relates to a work station of a textile machine producing cheese with a mechanical yarn store arranged in the area of the yarn traversing triangle, with which the changes in the yarn winding speed that occur when winding a cheese due to the yarn winding are compensated.

The workstations of textile machines producing cross-wound bobbins, which are designed as open-end rotor spinning machines, are known to have an open-end rotor spinning device that generates a thread at a constant delivery speed, and a winding device that ensures that the thread produced is wound onto a winding bobbin and thereby is traversed in such a way that a cheese is created, as well as via a thread store, which compensates for the thread winding speed and thread tension fluctuations that occur due to the thread swaying.

In this context, both pneumatically and mechanically operating thread stores are known in textile machine construction, mechanical thread stores differing considerably in terms of their design.

Mechanical thread stores can, for example, be acted upon in a defined manner and have a relatively complex control device. However, mechanical thread stores can also have only one spring element which is deflected by the thread when the thread winding speed changes.

Controllable mechanical thread stores, as for example in the DE 24 54 917 C2 are usually used when winding conical cross-wound bobbins. That is to say, with such yarn stores, the amount of material that occurs when winding conical cheese in the area of the winding device is in some cases considerable Changes in the thread winding speeds are adjusted to the constant thread delivery speed of the open-end rotor spinning device.

These known thread stores generally each have three thread deflecting rollers positioned in the region of the thread path, two of the thread deflecting rollers being arranged in a stationary manner and the third thread deflecting roller being movably mounted on a pivot lever. That means that during the spinning operation the third thread deflection roller swings out if necessary and temporarily extends the length of the regular thread path.

The thread deflection rollers of these known thread stores, whose axes of rotation are each orthogonal to the traversing plane of the thread to be wound, each have a V-shaped thread guide groove in the area of their running surface.

Mechanical thread stores that compensate for the changes in the thread winding speed caused by the thread winding speed by means of a leaf spring element are, for example, in the DE 28 03 378 C2 described.
These known thread stores, which are used in particular when winding cylindrical cross-wound bobbins, each have a leaf spring element to which a thread deflection roller positioned in the region of the thread path of the thread to be wound is attached at the end.

The Indian DE 28 03 378 C2 The thread store described has, for example, a leaf spring element in which the leaf spring is fixed to the machine frame of a textile machine via a holder in the form of two steel clamps and is connected to a thread deflection roller via a roller carrier.
In the middle part between the holder and the roller carrier, the leaf spring is also embedded in rubber-elastic elements that are intended to prevent uncontrollable vibrations from occurring.
In these mechanical thread stores, too, the axes of rotation of the thread deflection rollers are each arranged orthogonally to the traversing plane of the thread to be wound, where in the DE 28 03 378 C2 there are no indications regarding the exact formation of the running surface of the thread deflection rollers.
In the DE 10 2009 021 066 A1 a work station of an open-end rotor spinning machine is also described, which is also equipped with a mechanical thread store.
This known thread store also has three thread deflection rollers arranged in the region of the thread path.
Two of the thread deflection rollers are stationary, for example, on the housing of a waxing device, while the third thread deflection roller, supported by leaf springs, is attached to a movably mounted pivot lever.
In order to facilitate the threading of a thread into the thread store after a thread breakage, in this known thread store the axes of rotation of the thread deflection rollers are each parallel to the traversing plane of the thread to be wound.
The running surfaces of the yarn deflection rollers each have a V-shaped yarn guide groove.

The DE 103 54 588 A1 discloses a job according to the preamble of claim 1 with a mechanical thread store with spaced-apart, stationary thread guide means and a displaceable thread guide means arranged therebetween. The thread guide means comprise a V-shaped guide groove.
This known mechanical thread store has proven itself both when winding cross-wound bobbins that have a relatively low thread tension, for example when winding dye bobbins, and when winding so-called coarse yarn bobbins, where the thread tension is significantly higher during the winding process. In practice, however, it has been found that with such a designed thread storage, the thread is strongly acted upon during winding by the traversing thread guide in the area of the output-side thread deflection roller of the thread storage transverse to the running direction of the thread. In other words, with these thread stores there is the risk that the traversing thread will be inside the V-shaped thread guide groove emigrates to the side and / or slides completely out of the V-shaped thread guide groove of the thread deflection roller on the output side.

In such a case, in which the thread to be wound is no longer properly guided in the thread guide groove of the thread deflection roller on the output side of the thread store, the thread often runs into neighboring components of the winding device, with the result that these components are damaged over time and replaced Need to become. From the JP S61 2674 A a thread store with pulleys is known, which are traversed together with the thread. This is intended to reduce fluctuations in the thread tension. The guide grooves of the deflection rollers can optionally be V-shaped or U-shaped.

The DE 41 31 450 C1 discloses a thread store in which the axes of rotation of the thread deflection rollers are each arranged orthogonally to the traversing plane of the thread to be wound. The deflection rollers have grooves with side surfaces parallel to one another.

Based on the aforementioned prior art, the invention is based on the object of developing a thread deflection roller for a mechanical thread store which is designed so that a traversing thread is safely guided in a thread guide groove of the thread deflection roller even when the axis of rotation of the thread deflection roller is parallel to the traversing plane of the thread is arranged and the thread is acted upon by lateral forces during winding.

According to the invention, this object is achieved by a work station of a textile machine producing cheese cross-wound bobbins with a mechanical thread store arranged in the area of the thread traversing triangle, with which the changes in thread winding speed that occur when winding a cheese due to thread traversing are compensated. The mechanical thread store has a stationary, input-side thread deflection roller, a movably mounted thread deflection roller and a stationary, output-side thread deflection roller, which is the starting point of the thread traversing triangle, the axes of rotation of the thread deflection rollers being arranged parallel to the traversing plane of the thread.

According to the invention, the stationary, input-side thread deflection roller and the movably mounted thread deflection roller have a V-shaped thread running surface and the stationary, output-side thread deflecting roller has a thread running surface in which a U-shaped thread guide groove is incorporated.

Further advantageous embodiments of the invention are the subject of the dependent claims.

The inventive design of the output-side thread deflection roller has the particular advantage that a thread guide groove constructed in this way can ensure that the running thread is reliably guided even during the traversing process. That is, the U-shaped thread guide groove reliably prevents the running thread from sliding out of the thread guide groove of the thread deflecting roller under the influence of lateral forces that are effective due to the thread swaying and from being able to run against add-on parts of the winding device.
The inventive design of the thread deflection roller consequently ensures in a simple manner that the running thread is always guided correctly in the U-shaped thread guide groove of the output-side thread deflection roller of a mechanical thread store.

Since the thread always runs orthogonally to the axes of rotation of the thread deflecting rollers during winding operation in the area of the stationary, input-side thread deflection roller and the movably mounted thread deflection roller and is therefore not subject to any side forces, the stationary, input-side thread deflection roller and the movably mounted thread deflection roller each have only one V-deflection roller formed thread running surface, which ensures relatively reliably that the running thread is reliably guided in the area of the two thread deflection rollers.

In an advantageous embodiment, it is provided that the U-shaped thread guide groove of the thread deflection roller on the output side is designed such that the width and depth of the thread guide groove are the same.

Such an embodiment, which is easy to create, ensures, for example, that the thread can be threaded into the thread guide groove again relatively easily after a thread breakage, while on the other hand the threaded thread always remains safely guided in the thread guide groove during the winding process.

In an alternative embodiment, however, it can also be provided that the width and the depth of the U-shaped thread guide groove are different.
This means that the width and the depth of the thread guide groove can be adapted to the thread material to be processed or to the respective winding conditions under which work is carried out, so that requirements-based conditions are always given.

In the case of difficult, for example very hairy, yarns, the width of the U-shaped thread guide groove can be greater than the depth of the thread guide groove machined into the thread running surface of the thread deflection roller.
The thread guide groove can, however, also be designed such that the width of the U-shaped thread guide groove is smaller than the depth of the thread guide groove.

The most advantageous design of the U-shaped thread guide groove ultimately depends, as already indicated above, preferably on the material that is to be processed on the workstations of the textile machine producing cross-wound bobbins.

In an advantageous embodiment, the width of the thread guide groove machined into the thread running surface of the thread deflecting roller is between 3 and 8 mm.
Such a design ensures that the running thread can be threaded easily and safely into the thread guide groove at any time.
This means that after a thread breakage, the new thread can always be repositioned quickly and reliably in the area of the thread guide rollers of a thread store, in particular, the threading of the running thread into the U-shaped thread guide groove of the thread deflection roller on the output side of the thread store does not pose a problem.

The invention is explained in more detail below using an exemplary embodiment shown in the drawings.

Fig. 1

in perspektivischer Vorderansicht schematisch eine Arbeitsstelle einer Offenend-Rotorspinnmaschine, mit einem vor dem Fadenchangierdreieck angeordneten mechanischen Fadenspeicher, bei dem die Rotationsachsen der Fadenumlenkrollen parallel zur Changierebene des Fadens angeordnet sind,

Fig. 2

in Vorderansicht eine Spulvorrichtung einer Arbeitsstelle einer Offenend-Rotorspinnmaschine mit einem mechanischen Fadenspeicher, dessen ausgangsseitige Fadenumlenkrolle erfindungsgemäß ausgebildet ist,

Fig.3

in einem größeren Maßstab eine erfindungsgemäß ausgebildete Fadenumlenkrolle eines mechanischen Fadenspeichers,

Fig.4

eine Fadenumlenkrolle eines mechanischen Fadenspeichers gemäß Stand der Technik.

It shows:

Fig. 1

in a perspective front view schematically a work station of an open-end rotor spinning machine, with a mechanical thread store arranged in front of the thread traversing triangle, in which the axes of rotation of the thread deflection rollers are arranged parallel to the traversing plane of the thread,

Fig. 2

a front view of a winding device of a work station of an open-end rotor spinning machine with a mechanical thread store, the output-side thread deflection roller of which is designed according to the invention,

Fig. 3

on a larger scale, a thread deflection roller of a mechanical thread store designed according to the invention,

Fig. 4

a thread deflection roller of a mechanical thread store according to the prior art.

The Fig. 1 shows in a perspective front view, very schematically, a work station 10 of a textile machine producing cheese, in the present case an open-end rotor spinning machine.

As is known, such open-end rotor spinning machines have a large number of such work stations 10, which are arranged in a row next to one another and are of identical design. At the work stations 10, an open-end rotor spinning device 12 A thread 17 is spun from a so-called feed sliver which is stored in sliver cans (not shown) and is then wound onto a winding device 18 to form a cheese 19.

For this purpose, the winding devices 18 of such work stations 10 each have a bobbin frame 8 for rotatably holding the cheese 19, a thread traversing device 22 with a traversing thread guide 1 that can be driven by a single motor, for example, for traversing the thread 17 running onto the cheese 19, and a bobbin drive device 23 for frictional rotation of the cheese 19. The reel drive device 23 has a reel drive roller 14 to which an electric motor drive 27 is connected.

In order to be able to compensate for the changes in thread tension and thread winding speed that occur during the winding process due to thread winding, the work stations 10 each have a thread store 4. In the present case, the thread store 4 is designed as a mechanical thread store and is arranged directly in front of a paraffining device 5.

Each of the work stations 10 of such an open-end rotor spinning machine has a number of further, different thread handling devices or thread treatment devices that are necessary to enable the work stations 10 to operate properly.

The work stations 10 each have a so-called thread monitor 3 and a thread withdrawal device 20, for example.
The work stations 10 are also each equipped with a suction nozzle 21 which is designed such that a thread 17 that has run onto the cheese 19 after a thread break, for example, can be pneumatically picked up and presented to the open-end rotor spinning device 12 for re-spinning.

As in Fig.1 indicated, the drive of the thread take-off device 20, the suction nozzle 21, the traversing thread guide 1 and the bobbin drive roller 14 takes place in each case via an individual drive 24, 25, 26, 27. The individual drives 24, 25, 26, 27 are each connected via a control line 28, 29, 30, 31 to a workstation computer 6, which in turn, preferably via a bus system 7, with a ( not shown) central control unit of the open-end rotor spinning machine is connected.

As can be seen, a mechanical thread store 4 arranged directly in front of a waxing device 5 with respect to the thread path has two stationary thread deflecting rollers 38, 39, for example supported on the housing of the waxing device 5, and a movably mounted thread deflecting roller 36 acted upon by the thread 17 during the spinning operation.
The thread deflecting roller 36 is connected via a leaf spring element 34 to an actuating lever 35 which is rotatably supported to a limited extent and can be displaced in a defined manner by means of a drive, for example a thrust piston gear 37. That is, the adjusting lever 35 and thus the thread deflecting roller 36 of the thread storage device 4 can optionally be in a piecing position (not shown) or in the in Fig.1 operating position shown.

The Fig. 2 shows in front view and on a slightly larger scale that in FIG Fig.1 The winding device 18 of a workstation 10 of an open-end rotor spinning machine is shown very schematically.

As can be seen, a thread 17 produced by an open-end spinning device 12 and delivered by a thread take-off device 20 at a constant thread speed in the thread running direction F first passes through a thread store 4 on its way to a cheese 19 and then slides over a paraffin body 11 of a paraffining device 5.

Such waxing devices have long been known in various embodiments, so that a more detailed description of the structure and the function of such a waxing device 5 is dispensed with.

Following the paraffining device 5, the thread 17 traversed by a traversing thread guide 1 slides over a thread deflection guide 2 and is wound onto a cross-wound bobbin 19 rotated by a bobbin drive roller 14 in a frictionally engaged manner.

As can be seen, the mechanical thread store 4 has two thread deflecting rollers 38, 39 arranged stationarily on the housing of the paraffining device 5 and a movably mounted thread deflecting roller 36 connected to an adjusting lever 35 via a leaf spring element 34.

The stationary thread deflection roller 38 forms the input-side component of the thread store 4, while the also stationary thread-deflection roller 39 functions as the output-side component of the thread store 4 and at the same time forms the starting point of a so-called thread traversing triangle 9. That is, the thread 17 is alternately traversed between the end faces of the cheese 19 when running onto the cheese 19 by the traversing thread guide 1, which, as in FIG Fig. 2 indicated, leads to the creation of a thread traversing triangle 9.

The thread traversing triangle 9 has the thread deflecting roller 39 as its starting point and the points where the thread 17 runs onto the cheese 19 as the end points.
As is quite understandable, when the thread 17 traverses, there are constant changes in the distance between the thread deflection roller 39 and the point at which the thread 17 runs on the cheese 19, with the result that thread tension and thread winding speed changes constantly occur.
These thread winding speed changes are compensated for by the movably mounted thread deflection roller 36 of the thread store 4 in that the thread deflection roller 36 gives way to the rear or forwards and thereby compensates for the thread winding speed changes.

The thread deflection rollers 38, 36, which are not loaded by the running thread 17 during the winding operation by any side forces, but are only acted upon by thread forces orthogonal to their axis of rotation 15, 16, each have a V-shape formed thread running surface, that is, in the thread deflection rollers 38, 36, the running thread 17 is guided in a V-shaped groove.

The thread deflection roller 39, which, as indicated above, is the starting point of a thread traversing triangle 9, on the other hand, is acted upon by the running thread 17 not only by thread forces orthogonal to its axis of rotation 13, but also by lateral forces due to the traversing of the thread 17 as it runs onto the cheese 19 . That is, the running thread 17 traversed by the traversing thread guide 1 alternately tends to leave the center of the thread deflection roller 39 either to the left or to the right and, for example, to run down to the side of the thread deflection roller 39 or to adjacent components.

In order to be able to reliably guide the thread 17 also in the area of the thread deflection roller 39 of the thread store 4, the thread deflection roller 39 is therefore equipped according to the invention with a thread running surface 7 in which a U-shaped thread guide groove 32 is incorporated.

That is, the thread deflection roller 39 has a thread guide groove 32 with perpendicular side flanks, which prevent the running thread 17 from running out of the thread guide groove 32 of the thread deflection roller 39 and onto adjacent components during traversing.

In Fig. 4 shows one of the thread deflecting rollers 40 which have been customary in connection with mechanical thread stores but which are relatively sensitive with regard to thread transverse forces, that is to say the Fig. 4 shows a thread deflection roller according to the prior art.
As shown, the thread deflection roller 40 of the axis of rotation, which is identified by the reference number 41, has a V-shaped thread running surface, in the deepest region of which the thread 17 runs during the winding operation.
As can easily be imagined, with such a thread deflection roller 40 there is always the risk that the thread 17, as soon as lateral forces are applied, in the V-shaped configuration The thread running surface gives way to the side or slides out of the V-shaped thread running surface.

The Fig. 3 shows a thread deflection roller 39 designed according to the invention in detail. As can be seen, the thread deflection roller 39 has an axis of rotation 13 and a thread running surface 7 arranged parallel to the axis of rotation 13.
A U-shaped thread guide groove 32 is incorporated into the thread running surface 7, in the bottom of which, as shown, the thread 17 is safely guided.
The width B or the depth T of the thread guide groove 32 can be specified differently depending, for example, on the material that is to be wound or on the special winding conditions under which work is carried out.
The U-shaped thread guide groove 32 can be designed, for example, such that the width B and the depth T of the thread guide groove 32 are the same.

In an alternative embodiment, however, it can also be provided that the width B and the depth T of the U-shaped thread guide groove 32 are designed differently. That is, it is both conceivable that the width B of the U-shaped thread guide groove 32 is greater than the depth T of the thread guide groove and that the width B of the U-shaped thread guide groove 32 is smaller than the depth T of the thread guide groove.

Function of the device according to the invention:

During the spinning and winding operation, the thread 17 produced in the open-end rotor spinning device 12 is withdrawn from the open-end rotor spinning device 12 by the thread withdrawal device 20 at a constant yarn delivery speed and conveyed to the winding device 18, where it is wound into a cylindrical cheese 19. The cheese 19 is rotatably mounted between the arms of a coil frame 8 and rests with its surface on the single motor-driven, constant speed rotating coil drive roller 14, which drives the cheese 19 via frictional engagement.

This means that the thread 17 produced in the open-end rotor spinning device 12, when it reaches the area of the winding device 18, is traversed by a traversing thread guide 1 of a thread traversing device 22 in such a way that it runs onto the surface of the cheese 19 in intersecting layers.

Since the thread winding speed changes continuously during the winding process due to the thread winding, the thread 17 presented by the thread take-off device 20 at a constant delivery speed, before it slides over a paraffining device 5, is also passed over a mechanical thread store 4, which compensates for the thread winding speed changes.
The mechanical thread store 4 has a stationary thread deflecting roller 38 on the input side, a movably mounted thread deflecting roller 36 arranged on a leaf spring element 34, and a stationary thread deflecting roller 39 on the output side.

As in the Figures 1 and 2 shown, the thread deflection roller 36 is connected via a leaf spring element 34 to a pivotably mounted control lever 35 and positioned in its operating position in the path of the thread 17 that the running thread 17 deflects slightly through the thread deflection roller 36 and the thread 17 with one of the spring force of the leaf spring element 34 dependent thread tensile force is applied.

Since the thread 17 always runs orthogonally to the axes of rotation 15, 16 of the thread deflection rollers 38, 36 during the winding operation in the area of the thread deflection rollers 38, 36 and is therefore not subject to any side forces, the thread deflection rollers 38, 36 each have only one V-shaped thread running surface , which ensures relatively reliably that the running thread 17 is reliably guided in the area of the thread deflection rollers 38, 36.

In the area of the output-side thread deflecting roller 39 of the thread store 4, however, proper thread guidance is much more difficult, since the thread 17 running onto the cheese 19 and traversing through the traversing thread guide 1 the thread guide surface of the thread deflection roller 39 is subjected to considerable lateral forces.

In order to ensure that the incoming thread 17 is always reliably guided on a thread guide surface in the area of the output-side thread deflection roller 39, which is known to form the starting position of a thread traversing triangle 9, a U-shaped thread guide groove 32 is incorporated into the thread running surface 7 of the thread deflection roller 39.
The vertical flanks of the U-shaped thread guide groove 32 prevent the running thread 17 from running laterally from the thread guide surface of the thread deflecting roller 39 under the influence of the lateral forces and from grinding on adjacent components.
The mechanical thread store 4 automatically compensates for the changes in thread winding speed that occur during winding operation due to thread traversing by corresponding deflection of the thread deflection roller 36 arranged at the end of a leaf spring element 34 and keeps the thread tension of the thread 17 running up on the cheese 19 almost constant during the entire winding process. This means that the mechanical thread store 4 ensures almost uniform winding conditions, in which it not only prevents an increase in thread tension when the thread 17 traverses in the direction of the bobbin flanks of the cheese 19 due to the increase in the thread winding speed, but also prevents that a thread tension drop occurs when the thread 17 traverses in the direction of the center of the package 19 and the thread winding speed is reduced.

Claims (6)

1. Workstation (10) of a textile machine that produces cross-wound packages, comprising a mechanical thread storage device (4), which is arranged in the region of the thread traversing triangle (9) and by means of which the changes in the thread winding speed that occur during the winding of a cross-wound package (19) because of the thread traversing are compensated, the mechanical thread storage device (4) having a stationary input-side thread deflection roller (38), a movably mounted thread deflection roller (36) and a stationary output-side thread deflection roller (39), which is the starting point of the thread traversing triangle (9), the axes of rotation of the thread deflection rollers (38, 36, 39) being arranged parallel to the traversing plane of the thread,
   and the stationary input-side thread deflection roller (38) and the movably mounted thread deflection roller (36) having a V-shaped thread running surface, characterised in that
   the stationary output-side thread deflection roller (39) has a thread running surface (7) in which a U-shaped thread guide groove (32) is formed.
2. Workstation (10) according to claim 1, characterised in that the U-shaped thread guide groove (32) of the stationary output-side thread deflection roller (39) is designed in such a way that the width (B) and the depth (T) of the thread guide groove (32) are equal.
3. Workstation (10) according to claim 1, characterised in that the width (B) and the depth (T) of the U-shaped thread guide groove (32) of the stationary output-side thread deflection roller (39) are different.
4. Workstation (10) according to claim 3, characterised in that the width (B) of the thread guide groove (32) is greater than the depth (T) of the thread guide groove (32) of the stationary output-side thread deflection roller (39).
5. Workstation (10) according to claim 3, characterised in that the width (B) of the thread guide groove (32) is less than the depth (T) of the thread guide groove (32) of the stationary output-side thread deflection roller (39).
6. Workstation (10) according to claim 1, characterised in that the width (B) of the thread guide groove (32) of the stationary output-side thread deflection roller (39) is between 3 and 8 mm.

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