WO2022008724A1

WO2022008724A1 - Method and apparatus for introducing a false twist, and spinning machine

Info

Publication number: WO2022008724A1
Application number: PCT/EP2021/069183
Authority: WO
Inventors: Gernot Schaeffler; Peter Blankenhorn; Nora Stopp; Felix Heltsche; Ida POTTHARST
Original assignee: Maschinenfabrik Rieter Ag
Priority date: 2020-07-10
Filing date: 2021-07-09
Publication date: 2022-01-13
Also published as: CN116113733A; DE102020118327A1

Abstract

The invention relates to a method, an apparatus and a spinning machine for introducing a false twist into a thread (7), wherein a thread running plane (20) is formed by the largely direct course, in plan view, of the thread (7) through a drafting unit (3) to a spinning device (17) and the thread (7) leaves the drafting unit (3) at an output pinch point (6) formed by an upper roller (4) and/or a lower roller (5) or the thread running plane (20) is formed by the largely direct course, in plan view, of the thread (7) from a thread take-off tube (45) of a rotor spinning device (17) to an output pinch point (6) of an output roller pair (47). The thread (7) runs between the output pinch point (6) and the spinning device (17) via a roll (8) rotating about an axis of rotation (15) that is inclined with respect to the thread running plane (20), and in the process rotates simultaneously about its longitudinal axis, wherein a false twist is introduced into the thread (7) in the process. The thread (7) runs, between the roll (8) and the spinning device (17), through a thread guide (9) or between the roll (8) and the output pinch point (6) of the take-off roller pair (47). The roll (8) is held in at least two positions (25, 26), wherein, in the first position (25), it is arranged in the thread run of the thread (7) and is driven by the thread (7) and, in the second position (26), it is arranged outside the thread run and is not driven.

Description

The present invention relates to a method for introducing false twists into a thread, with a thread running plane being formed by the direction in which the thread runs, which is largely direct when viewed from above, through a drafting system to a spinning device, and the thread passes the drafting system on one of one exit nip point formed by an upper roller and/or a lower roller, or the thread running plane is formed by the thread running largely directly in plan view from a thread draw-off tube of a rotor spinning device to an output nip point of a pair of draw-off rollers. The thread runs between the exit nip point and the spinning device over a roller that rotates about an axis of rotation that is at an angle to the plane of the thread travel. The thread runs through a thread leader between the roller and the spinning device or between the roller and the output nip point of the pair of take-off rollers. The invention also relates to a device for introducing false twists into a thread on a spinning machine, with a roller and a holder for the roller, the roller being arranged on the holder so that it can rotate without a motor drive, and a corresponding spinning machine.

US Pat. No. 2,718,111 A discloses a spinning device with a roller as a false twist element. The roller is driven by a worm. The housing in which the roller is stored can be turned around the worm. The roller always remains driven and in the direction of the grain. Driving the roller is energy-intensive and must be matched to the speed of the thread.

From DE 6941966 U is a device for false twisting of monofilaments or continuous yarns made of linear high polymers by wrapping a rotatable, obliquely to the running direction of the monofilaments or continuous yarns angeord Neten role disclosed. The false twist element consists of a single, freely rotatable roller with a concave thread running surface, the thread running surface being a surface of rotation which is preferably symmetrical to the perpendicular bisector of the axis of rotation of the roller. The run-up angle of the thread on the false twist unit is variable. However, the thread always remains in contact with the reel. The disadvantage here is that the roller of the false twist unit cannot be moved out of the yarn path. This is a hindrance, especially when changing bobbins and when piecing, but also when the spinning device is to be used without a false twist unit.

The object of the present invention is therefore to eliminate the disadvantages of the prior art.

The object is achieved by a method, a device and a spinning machine with the features of the independent patent claims.

In a method according to the invention for introducing false twists into a thread, a thread running plane is formed by the course of the thread, which is largely direct in plan view, through a drafting system to a spinning device. The thread leaves the drafting system at an exit nip formed by an upper roller and/or a lower roller. In a spinning device in which no drafting system is used, i.e. in a rotor spinning device with an opening roller, the thread running plane is formed by the course of the thread, which is largely direct in plan view, from a thread take-off tube of the rotor spinning device to an output nip point of a pair of take-off rollers. The thread runs between the exit nip point and the spinning device - or between the spinning device and the exit nip point - over a roller that rotates about an axis of rotation that is at an angle to the thread running plane thread in. The thread runs through a thread guide between the roller and the spinning device or between the roller and the output nip of the deduction roller pair.

According to the invention, the roller is held in at least two positions, where it is arranged in the first position in the thread path of the thread and is driven by the thread and denlaufs arranged in the second position outside the thread and is not driven.

Accordingly, the roller has no drive of its own, but is finally driven by the running thread. On the one hand, this saves energy and, on the other hand, no control is required to adapt the speed of the roller to the speed of the thread. False twisting is introduced exclusively by the fact that the thread is deflected from the roller from its original thread running plane and the axis of the roller is aligned at an angle to the longitudinal axis of the thread. This results in lateral forces on the thread, which rotate the thread about its longitudinal axis and thus initiate a false twist in the thread.

Due to the possibility that the roll is held in at least two positions, the roll can be driven by the thread in the first position. In the second position, the roller is no longer running in the thread and is accordingly no longer driven. In this second position of the reel, it is also possible for a bobbin change or a piecing process to be carried out without the reel being in the way. It is also possible for the spinning device to be operated with or without a false twist unit. The spinning position can therefore be used in a variety of ways without the need for complex conversion work. It is particularly advantageous if a plurality of rollers, which are assigned to adjacent spinning devices, can be moved simultaneously and/or individually between the first and second positions. In particular, with a simultaneous movement of the rollers from the first to the second position and vice versa, the corresponding preparation can be carried out quickly and reliably by removing the rollers from the bobbin changing area when changing bobbins at several spinning stations. Alternatively or additionally, a single roller can be moved individually from the first to the second position and vice versa. This creates the possibility of an individual adaptation of each individual spinning position in relation to false twist initiation or bobbin change.

Furthermore, it is advantageous if the roller is moved between the first and the second position together with the thread guide and/or individually, independently of the thread guide. If the role is moved together with the thread guide between the two positions, the thread guide can also be removed very quickly from the area of the bobbin change when changing the bobbin. This will be sufficient in most cases. However, if the roller for the false twist introduction is to be used as an option, it is advantageous if the roller can be moved between the two positions independently of the thread guide, ie individually with respect to the thread guide.

It is particularly advantageous if the thread is moved laterally out of the thread running plane by the roller and the thread wraps around the upper roller or the lower roller after the output clamping point in such a way that this introduces another false twist into the thread. The thread and the roller as well as the thread and the upper roller or the lower roller thus cross one another, so that the thread nestles against the lateral surface of the roller and the lateral surface of the upper roller or the lower roller during the deflection. False twist is introduced into the thread both on the roller and on the upper and lower rollers. Through the two positions where the false twist is introduced into the thread, the spinning stability can be significantly increased without the quality of the thread produced suffering from the introduction of too high a permanent twist.

If, in an advantageous embodiment of the invention, the thread is raised or lowered relative to the course of the thread without a roller in addition to the lateral deflection, the operation of the spinning station can be simplified either by an operator or by a robot. In addition, a collision of a robot with the thread can be avoided, in particular if the thread is pressed into the spinning machine by means of the roller, ie is lowered.

A device according to the invention for introducing false twists into a thread on a spinning machine has a roller and a holder for the roller. The roller is rotatable on the holder without a motor drive being arranged. According to the invention, the holder is attached to a bearing in order to be able to assume at least two positions, the first position being such that when the device is used as intended, the roller is arranged in the thread path of the thread and is driven by the thread, and in the second position the Role is arranged outside of the yarn path and is not driven.

The device can be arranged at any spinning position of the spinning machine. In addition, the device is designed to be retrofitted to an existing spinning machine. Since the roller is driven by the running thread, a separate motor with a corresponding power supply and control is not required. It is precisely for this reason that the subsequent installation of the device on an existing spinning machine is particularly easy. Due to the two positions of the roll, the spinning machine can be used either with or without false twisting can be used in any direction. The particular advantage of the device built onto the spinning machine is that during operation the roller can be arranged in a position that is optimal for the false twist, but on the other hand in a non-interfering position due to the second position for a bobbin change and a piecing process place can be placed.

It is particularly advantageous if the holder has a guide element for the thread. In particular, when the roller is swiveled back into the thread path from outside the thread path, it must be ensured that the thread actually runs over the roller and does not slip off to the side. The guide element, which is designed, for example, in the form of a hump with a guide surface, ensures that the thread is always guided to the roller.

It is also advantageous if the bearing is a rotary bearing or a displacement bearing. With a pivot bearing, the roller can be pivoted very easily around a pivot point so that it can move from the first to the second position. Ideally, the weight distribution of the holder with the reel is such that it is stable in both positions. In this case no additional device, such as a spring, is required to ensure the first or second position. With a displacement bearing, the roller with its holder can be moved between the two positions by a linear or arc-shaped displacement. Here, too, it should be ensured that the respective position can be maintained independently, preferably without additional aids, and that the user first has to actively actuate it in order to move from one position to the other.

Furthermore, it is advantageous if the position of the holder is determined by a latching device of the bearing, in particular with a cam or a magnet, and/or by a stop. The stop ensures that the position of the holder with its role is at a defined point. A cam or magnet fixes this position sufficiently so that the roller cannot unintentionally leave this position. Only active activation of the holder by moving it out of the latching device in the direction of the other position causes the holder and thus the role to change position. With a corresponding weight distribution of the roller and the holder, it may also be sufficient that there is only one stop against which the holder rests in order to define the first or second position.

It is also advantageous if the bearing has a receptacle for attachment to a preferably pivotably mounted thread guide or longitudinal component of the spinning device. The recording is advantageously designed so that the device can be retrofitted to the spinning machine. In this case, for example, an already existing longitudinal component of the spinning device is used in order to attach the device to it. It is particularly advantageous if the receptacle is formed in such a way that the device can be arranged on the yarn guide that is already present at the spinning station. This also makes it very easy to subsequently attach the false twisting device, for example with a clip connection, to an existing spinning machine. In addition, the mobility of the thread guide can be used to pivot the false twisting device simultaneously with the thread guide. The false twisting device to be attached to the spinning device can thus be designed very simply and inexpensively.

A spinning machine according to the invention has a large number of spinning positions, each of which includes a drafting system or a thread draw-off pipe, a spinning device and a device for introducing false twist into a thread. A thread running plane is formed by the course of the thread, viewed from above, largely directly through the drafting system to the spinning device, and the drafting system has an exit clamping point with an upper roller and/or a bottom roller where the thread leaves the drafting system. In a rotor spinning device, the thread running plane is formed by the largely direct path of the thread from the thread take-off tube of the rotor spinning device to an output nip point of a pair of pull-off rollers in plan view. Between the output clamping point and the spinning device between the spinning device and the output clamping point, a roller with an axis of rotation aligned obliquely to the plane of the thread running is arranged as a device for introducing false twist into a thread, with the running thread rotating about its longitudinal axis when passing the roller and receives a false wire. A thread guide is arranged between the roller and the spinning device or, in the case of a rotor spinning device, between the roller and the output nip point of the pair of take-off rollers. The roller is rotatable on a holder without a motor drive.

According to the invention, the holder is fixed in a bearing in order to be able to assume at least two positions, the first position being such that the roller is arranged in the threadline of the thread and driven by the thread, and in the second position it is arranged outside the threadline and not is driven. The two positions allow the roller to be brought into engagement with the thread, creating a false twist in the thread. Alternatively, the roller is disengaged from the thread or is in the position where the thread does not run. It can either be provided that a thread is produced which has no wrong twist, or the role is only in this position for the time during the bobbin change and the piecing process in order not to impede the bobbin change and the piecing process.

It is advantageous if the holder or the bearing is arranged on the thread guide or on a component of the spinning position, in particular on a longitudinal component of the spinning machine. By the arrangement of the camp or the Device on the thread guide, the roller can be moved together with the thread leader from the thread engagement of one position to the other position be in which no thread engagement is present. If the bearing or the holder is attached to a component of the spinning station, in particular to a longitudinal component of the spinning machine, a simple arrangement of the false twist device on the spinning machine is possible.

It is also advantageous if the thread guide or the component of the spinning station, in particular the longitudinal component, is designed to be rotatable. Due to this very special advantage, the false twisting device or the roller can be adjusted from one position to the other by rotating the component, which preferably runs along several spinning stations. If several false twisting devices of several adjacent spinning stations are arranged on one component, these several false twisting devices can be adjusted simultaneously.

Preferably, the axis of rotation of the rotating roller is arranged at an angle of between 30° and 60° to the thread path when viewed in the thread path plane and/or when viewed onto the thread path plane and engages in the straight thread path in such a way that the thread turns around at the same time rotates its longitudinal axis. This exerts a force on both the thread and the roller. This force causes the thread to rotate about its longitudinal axis and creates the false twist in the thread, which contributes to the spinning stability of the thread.

The roller is preferably arranged on the spinning machine in such a way that the thread is raised or lowered in addition to the lateral deflection in comparison to the course of the thread without a roller in the plane of the thread. The thread thus runs denlaufs above or below the normal thread, as it would be without the false twisting device according to the invention. If the thread line is raised, the operation of the spinning position is simplified, in particular when attaching a thread. Is the grain against it lowered, i.e. closer to the machine than with the normal thread path, a robot patrolling along the spinning machine can drive past the spinning position without the risk of colliding with the thread.

It is also advantageous if the roller is arranged in such a way that the thread is deflected laterally out of the thread running plane by the roller and the thread contacts the upper roller or the lower roller after the exit nip point in such a way that this causes a second false twist in the thread brings in. The thread and the roller as well as the thread and the upper roller or the lower roller thus cross one another, so that the thread nestles against the lateral surface of the roller and the lateral surface of the upper roller or the lower roller during the deflection. False twist is introduced into the thread both on the roller and on the upper and lower rollers. The two points at which the false twist is introduced into the thread allow the spinning stability to be significantly increased without the quality of the thread produced suffering as a result of the introduction of too high a permanent twist.

With the inclined roller, false twist is introduced in the direction of the spinning triangle in the area between the drafting system outlet and yarn guide. The higher twist improves spinning stability. In this way, either the spindle speed or, with a constant spindle speed and a smaller alpha, the delivery speed can be increased without sacrificing the spinning stability and tensile strength of the yarn compared to classic spinning. On the other hand, compared to classic spinning, the spindle speed can be reduced at the same delivery speed and the required spinning performance per kilogram of spun yarn can be lowered.

The roll is in the grain line. According to the invention, the role is pivoted out of the thread path at times. So should when lifting the Sleeve - and since especially when doffing - thread guide and roller are brought outside the area of the sleeve body.

The reel is rotated by the thread. The forces that have to be absorbed by the thread when piecing to accelerate the roll, especially in the area of the weak piecing, can make piecing more difficult, especially in the case of delicate piecings. In these cases it is better if the roll is first brought out of the yarn path and only pivoted into the yarn path after piecing.

With long spinning geometries it may be that the roller is not in the doffer area. It therefore does not have to be moved back when doffing. In this case, the roller is placed on a stationary traverse. During piecing, the roll is moved into its piecing position outside of the yarn path and brought back into its spinning position after piecing. Locking positions can be provided for piecing and spinning positions. These positions can be realized, for example, either by means of resilient cams, but also with magnets.

The reel falls best into its spinning position due to its weight. Alternatively, it can also be brought into the other position with a spring.

Since most machine types have to swivel all the rollers out of the doffer area during doffing, it is better to fix the rollers on a traverse that can be rotated centrally. With this traverse, all rolls can be moved out of the doffer area on one side of the machine and back into the spinning position after the doffing process.

Both yarn guide and roller are preferably seated on a rod running through the machine. Yarn guide carrier and roll holder can are positioned together axially by a clamping ring. The clamping ring can be provided with common stops for the spinning and doffing positions. The roller can preferably be brought into the piecing position independently of the thread guide. It is advantageous if the roll holder is seated on the carrier of the thread guide in the spinning position.

So that the roll holder can be retrofitted into an existing spinning machine, it can also be clipped onto a rod. It is also possible to use a flask for fixing, which is clipped or screwed into the holder.

In a further advantageous embodiment, the holder of the roller is placed directly on the yarn guide and screwed or clipped onto the carrier of the yarn guide.

The advantage of this solution is the controlled thread guidance through the thread guide arranged very close to the roller.

With the inclined roller, the spinning speed can be increased or the yarn twist reduced. In addition, an optimization of the yarn path geometry is possible with the roller. The associated benefits, such as improved yarn quality in terms of hairiness and strength, softer yarn twist and improved feel in the end product, improved spinning stability, higher production or possible power savings per kilogram of spun yarn, make the inclined roller an extremely interesting spinning component.

The invention is embodied in accordance with the foregoing description, with the features mentioned being able to be present individually or in any combination. Further advantages of the invention are described in the following exemplary embodiments. It shows:

Figure 1 is a side view of a spinning position of a ring spinning machine,

FIG. 2 shows a front view of a spinning position of a ring spinning machine,

FIG. 3 shows a side view of a spinning position with the thread deflected upwards according to FIG. 2,

FIG. 4 is a front view with the thread deflected to the right,

FIG. 5 a roll with a deflected thread,

FIG. 6 shows a side view of a false twisting device according to the invention,

FIG. 7 shows a front view of a false twisting device according to the invention,

FIG. 8 shows a side view of the false twisting device from FIG. 7,

FIG. 9 shows a front view of another false twisting device according to the invention,

FIG. 10 shows a side view of the false twisting device from FIG. 9,

FIG. 11 is a front view of another false twisting device according to the invention,

FIG. 12 shows a side view of the false twisting device from FIG. 11, FIG. 13 is a front view of another false twisting device according to the invention in the first position in the yarn path,

FIG. 14 is a front view of the false twisting device of FIG. 13 in the second position outside the yarn path and

FIG. 15 shows a front view of a spinning station of a rotor spinning device.

In the following description of alternative exemplary embodiments, the same reference symbols are used for features that are identical and/or at least comparable in terms of their design and/or mode of operation compared to the other exemplary embodiments. If these are not explained again in detail, their design and/or mode of action corresponds to the design and mode of action of the features already described above. Said roller can have different lateral surfaces, which are, among other things, in particular a cylinder, a cone or a paraboloid, even if only one cylinder should be mentioned or shown in an individual case.

FIG. 1 shows a side view of a spinning station 1 of a ring spinning machine. A fiber structure 2 runs through a drafting system 3 and is drafted in the process. He leaves the drafting system 3 at a pair of rollers, which consists of an upper roller 4 and a lower roller 5. Upper roller 4 and lower roller 5 form an exit nip 6 in which the fiber structure 2 is clamped. In so-called compaction spinning, instead of the upper roller 4 or the lower roller 5, a suction pipe can also be present, which is wrapped around by a sieve belt and generates a negative pressure. The top roller 4 or the bottom roller 5 presses on the sieve apron and also clamps the fiber structure 2 at a corresponding output terminal point 6. From the output terminal point 6, the fiber structure 2 becomes a ver with a rotation seen thread 7 formed. The yarn 7 then reaches a false twisting device 22, in which it wraps around a roller 8 positioned at an angle to the yarn path, then passes through a yarn guide 9 to a spinning device 17. The spinning device 17 comprises a rotor 10 and a sleeve 11, on which the Thread 7 is wound up. The thread 7 forms a thread balloon 12 between the thread guide 9 and the runner 10. The sleeve 11 rotates at the speed of the spindle carrying it about a spindle axis 14, while the runner 10 is dragged along a spinning ring 13 by the winding thread 7 at a slightly lower speed.

Between the output terminal point 6 and the yarn guide 9, the Fa runs to the 7 in the false twisting device 22 over the roller 8, which is rotatably mounted about an axis of rotation 15. The roller 8 deflects the thread 7 from its normal line of thread 16, indicated by gestures, and lifts it out of this line of thread 16. The roller 8 is pivoted in this side view in a Win angle ß between 30 ° and 60 ° to the normal thread path 16 is arranged. The thread 7 thus does not contact the roller 8 perpendicularly to the axis of rotation 15 of the roller 8 but at an angle, so that tangential forces act on the thread 7 . The tangential forces cause the thread 7 to rotate, which creates a false twist between the exit nip point 6 and the thread guide 9 .

FIG. 2 shows a front view of the spinning position 1 of a ring spinning machine.

In this representation, the role 8 can be seen as it is arranged at the spinning station 1 at. The roller 8 is located in the area of a thread running plane 20. The thread running plane 20 is defined by the path of the fiber structure 2 through the drafting system 3 and further along this line through the spindle axis 14. As can be seen from this illustration, the thread 7 remains open its way from the drafting system 3 to the thread guide 9 in this thread running level 20. Minor deviations from this by snuggling the Thread 7 to the roller 8 or through the circulation of the thread guide 9 remain ben here disregarded. The thread running plane 20 thus essentially corresponds to the plane of the drawing in FIG.

From this representation of FIG. 2, it is clearly evident that the roller 8 is arranged at an angle α inclined to the plane 20 of the thread travel. The thread 7 runs obliquely over the roller 8, whereby tangential forces are ent on the thread 7, which introduce a false twist in the thread 7.

FIG. 3 shows a side view of a spinning position 1 with the thread deflected upwards according to FIG. The roller 8 and the Fa denführer 9 are arranged above the 11 Flülse. From this representation it can be seen that both the thread guide 9 and the roller 8 are a hindrance when changing the sleeve 11, since the sleeve 11 has to be pulled off its spindle in an upward direction. Accordingly, it is advantageous that the thread guide 9 and the roller 8 are removed when a wound bobbin has to be exchanged for an empty tube.

FIG. 4 shows a front view of the spinning station 1 with the roller 8, which deflects the thread 7 to the right. It would also be possible for the roller 8 to be arranged in such a way that it deflects the thread to the left. The inclination of the roller 8 can also be reversed. The same applies mutatis mutandis to the illustrations in FIGS. 1, 2 and 3. Here, too, the inclination of the roller 8 can be carried out in the direction other than that illustrated. Likewise, the thread can be pressed down instead of up, as shown in FIG. While in the illustration in FIG. 1 the thread 7 contacts the upper roller 4 after the nip 6 and thereby receives a further false twist, the thread 7 after the nip 6 is free according to the illustration in FIG. After the nip point 6, it no longer has any contact with the upper roller 4 or lower roller 5 and thus does not receive any false wire from these two rollers. The forces on the thread 7 and the roller 8 are shown in FIG. The roller 8 rotates because of the thread 7 pulled over it. The thread 7 is deflected by the roller 8 . The thread tension F is divided into a component FA in the axial direction and a component FR in the radial direction. The roller 8 is driven by the radial force component FR. Due to the axial component FA, the thread 7 moves along the outer surface of the roller 8. The axial component FA can in turn be broken down into a component FL aligned in the direction of the thread run and a component FT-WIRK perpendicular to the yarn axis. The component FT-WIRK perpendicular to the yarn path corresponds to the force that acts on the outer diameter of the yarn 7 and with which the torsional moment for the false twist is introduced.

The false twist entry depends on the diameter of the roller 8, the friction coefficient of the lateral surface of the roller 8, the deflection of the thread 7 or its angle of wrap around the roller 8, the inclination of the roller 8 to the undeflected thread 7, the number of rollers 8 and 8 used the smooth running of the roller 8.

The angle of the roller 8 that is optimal for the false twist insertion is in the range of 30°-60° to the line of the yarn path 16 of the non-deflected yarn dens 7 (see FIGS. 1, 2).

The surface of the roller 8 can be ceramic, a steel body with a rough hard coating, or a material such as rubber or a synthetic material such as elastomers, e.g. B. nitrile butadiene rubber (NBR, cover of top rollers).

The roller 8 should be easy to move. Suitable bearings for the roller 8 are small, oil-lubricated roller bearings, plain bearings with shafts smaller than 4 mm or aerostatic air bearings. For the optimization of the false wire entry however, rollers 8 with a defined braking torque are also used.

The false twisting device with the roller 8 is preferably attached to the structure of the spinning machine 1 by means of a holder 21 .

In order to introduce false twist into the yarn, in the prior art the thread 7 is often pulled over a web which is inclined relative to the thread path. Due to the coefficient of friction and the inclination of the web as well as due to the wrapping of the thread 7 around the web, frictional forces occur. The yarn friction to be overcome acts only to a small extent as a torsional moment for the introduction of false twists on the yarn 7. The maximum possible introduction of false twists is limited by the maximum possible yarn tension.

The increase in thread tension as a result of the physical relationships described by the Euler-Eytelwein equation can be reduced if the sloping web is replaced by the easily rotatable roller 8 . The thread 7 is pulled over the roller 8. The roller 8 rotates as a result. So that the thread 7 slides and/or rolls in the axial direction on the rotating roller 8. Since the friction of smooth-running bearings is much lower than the friction that occurs when the thread 7 is pulled over a fixed web, the rotating oblique roller 8 with reduced thread tension forces a significantly higher torsional moment can be exerted on the thread 7.

FIG. 6 shows a side view of a false twisting device 22 . The roller 8 is arranged on the holder 21 in such a way that its axis of rotation 15 is at an angle to the running of the thread 7 . As a result, the thread 7 is deflected from its normal, straight grain path. This ge rectilinear thread path can be recognized by the thread 7 shown in dashed lines. The holder 21 is attached to a longitudinal component 23 of the spinning machine, which runs at least along one spinning station 1, preferably along several spinning stations 1.

A pivot bearing 24 is arranged on the holder 21 . The pivot bearing 24 made it possible for the roller 8 to be positioned in a first position 25 and in a second position 26 shown in dashed lines. While the roller 8 deflects the thread 7 in the first position 25, in the second position 26 it is pivoted far out of the course of the thread 7 shown in dashed lines, so that there is no longer any contact with the thread 7. In the first position 25, the spinning position, the roller 8 can thus introduce a false twist into the thread 7, while in the second position 26 the thread 7 can be spun without a false twist. This second position 26 is advantageous, in particular when changing the sleeve 11 or when piecing the yarn dens 7 after a yarn break or on an empty sleeve 11.

In order to be able to take both the first position 25 and the second position 26 in a stable manner, a locking device is arranged in the pivot bearing 24 . The locking device consists of an elastically mounted cam 27 which can be turned within an outer ring 28 of the pivot bearing 24 . In this embodiment, the cam 27 is connected to the part of the holder 21 which receives the roller 8 . By rotating the roller 8, the cam 27 engages either in a first groove 29 or in a second groove 30 of the outer ring 28. By overcoming the elasticity of the cam 27, the roller 8 can be moved into the first position 25 or into the second position 26 and locked there.

FIG. 7 shows a sectional front view of an embodiment of the false twisting device 22 . The longitudinal member 23 is in this game Ausführungsbei a rod running along the spinning machine, which can be designed to be rotatable about its axis. On the longitudinal member 23 is for axial Fixation of the false twisting device 22 is provided a clamping ring 31, wel cher by means of a screw 32 on the longitudinal member 23 is fastened for rotation. The holder 21 is rotatably mounted on the longitudinal member 23 . It encompasses the clamping ring 31 on both sides, as a result of which the roller 8 with its holder 21 is fastened axially to the longitudinal component 23 .

FIG. 8 shows a side view of FIG. 7 in section. From this it can be seen that the clamping ring 31 has two stops 33 and 34 . With the proposals on 33 and 34 pins 35 and 36, which are attached to the holder 21 correspond. The holder 21 can be rotated relative to the longitudinal member 23, as a result of which the pin 35 comes into contact with the stop 33 and further rotation of the holder 21 is arrested. Likewise, pin 36 corresponds to the stop 34 and thus locks the holder 21 in the opposite direction of rotation. The roller 8 with its holder 21 can thus positions in two Po, which correspond to the positions 25 and 26, are locked. By twisting the rod of the longitudinal member 23, it is also possible, please include that the holder 21 is rotated from its first position 25, in which the stop 34 and the pin 36 abut each other, into its second position 26, in which the stop 33 and the pin 35 butt against each other.

The adjustment of the roller 8 from the first position 25 to the second position 26 can thus take place on the one hand by rotating the longitudinal component 23 . On the other hand, the roller 8 can also be adjusted manually into one of the two positions 25 or 26 by connecting either the stop 33 to the pin 35 or the stop 34 to the pin 36 with its holder 21 . This can also be supported by the fact that, for example, the pins 35 and 36 are magnetic and are thus attracted to the stop 34 or the stop 33 .

Similar to FIGS. 7 and 8, FIGS. 9 and 10 also show a front view and a side view of a false twisting device 22 in section. As can be seen from the front view of Figure 9, the Hal ter 21 of the roller 8 has a receptacle 18 with which it is on an axially the clamping ring 31 fixed carrier 37 is clipped. The carrier 37 carries the thread guide 9, which is arranged in the vicinity of the roller 8. About the Trä ger 37, the thread guide 9, also like the roller 8, in two positions 25 and 26 are pivoted. For this purpose, the clamping ring 31 again has two stops 33 and 34 . In a front, first position 25, which corresponds to a spinning position, the yarn guide 9 is held by the pin 36, which rests against the stop 34, in its intended working position. The roller 8, which is fixed to the support 37 of the thread guide 9 a related party, is thus also in its first position. To reach the second position, the roller 8 is pivoted about the longitudinal member 23 backwards. An edge of the carrier 37 hits the stop 33 and locks both the roller 8 and the thread guide 9 in the second position 26. This is shown with dashed lines.

This exemplary embodiment is particularly advantageous since it enables a corresponding false twisting device 22 with the roller 8 to be retrofitted to an existing spinning machine with a swiveling yarn guide 9 in a very simple manner. Hardly any conversion measures are required, which is why this is a particularly advantageous and cost-effective variant of the present invention.

Another embodiment of the present invention is shown in FIGS. 11 and 12 in front and side views. The longitudinal component 23 is surrounded by the support 37 for the thread guide 9 and the holder 21 of the roller 8. Carrier 37 and holder 21 can be rotated about longitudinal member 23 . They are in turn fixed by the clamping ring 31 in their axial direction. They can be rotated from the first position 25 to the second position 26 both together and independently of one another. In the first position 25, the pin 36 of the carrier 37 of the thread guide 9 strikes the stop 34 of the clamping ring 31. The holder 21 contacted in this posi tion a survey 38 of the carrier 37. If necessary, the role 8 with her Holder 21 can be rotated about the longitudinal member 23 to the second position 26 with an edge of the holder 21 abutting the stop 33 of the clamping ring 31 as shown in phantom in Figure 12. The carrier 37 with the thread guide 9 can continue to remain in the first position 25 ver. Alternatively, in addition to the holder 21, the carrier 37 with the thread guide 9 can be rotated about the longitudinal component 23 and also remain in the second position 26. The twisting can take place until the elevation 38 of the carrier 37 hits the holder 21 . Of course, it is also possible here for the longitudinal component 23 to be rotated, so that both the roller 8 and the thread guide 9 change together between the two positions 25 and 26 .

FIG. 13 shows a front view of a further false twisting device 22 according to the invention in the first position 25 in the yarn path. The thread 7 runs over the surface of the roller 8 and through the thread guide 9. The roller 8 is attached to the holder 21. The holder 21 of the roller 8 is in turn attached to the carrier 37 for the thread guide 9 with 39 claws. With the claws 39, it can be quickly clipped onto the carrier 37 if a corresponding false-twisting device 22 is to be retrofitted. On the holder 21, a guide element 40 for the thread 7 is net angeord. In this exemplary embodiment, the guide element 40 is designed in the manner of a hump in the region of the bearing of the roller 8 on the holder 21 . In the first position 25 of the false twisting device 22 there is no contact between the thread 7 and the guide element 40 .

FIG. 14 shows a front view of the false twisting device 22 from FIG. 13 in the second position 26 outside the yarn path. This second position 26, folded away from the operating position, is assumed, for example, when a doffing process is being carried out at the spinning station. In this position, the roller 8 has no contact with the thread 7. The thread 7 only runs through the thread guide 9. The thread path is along the guide element. ments 40, wherein the thread 7 is close to the guide element 40 or even rests against it. It is essential that when the roller 8 moves back into the first position 25, the thread 7 does not slip off the roller 8--in this illustration on the left--but safely, as shown in FIG. 13, comes to rest on the circumference of the roller 8. When the roller 8 moves back into the first position 25 , the guide element 40 therefore forms a stop which ensures that the thread 7 is pushed onto the circumference of the roller 8 .

FIG. 15 shows a front view of a spinning station of a rotor spinning device 17 . An opening roller 43 is fed into sliver 41 via a feed device 42 . The fibers of the sliver 41 are separated in the opening roller 43 and reach a rapidly rotating spinning rotor 44. The fibers are drawn off from the spinning rotor 44 through a thread draw-off tube 45 as thread 7 by means of a pair of draw-off rollers 47. The pair of draw-off rollers 47 clamps the thread 7 and thus forms an exit nip 6. The thread 7 is then wound crosswise onto a rotating cross-wound bobbin 48. The thread running plane 20 is defined between the thread draw-off pipe 45 and the output clamping point 6 .

The false twisting device 22 for introducing a false twist also includes a roller 8 here. The roller 8 is not driven, but is rotated by contact with the running thread 46 ver. The thread 46 runs obliquely over the surface of the roller 8 and is easily deflected there. This creates a false twist on the thread 7 between the thread draw-off tube 45 and the output nip point 6 of the pair of draw-off rollers 47 or the thread guide 9, which act as a twist stop it is outside of the yarn path, can pivot, it is arranged in a holder 21, not shown here. net, as shown, for example, in FIGS. 6-14. In the ge pivoted, second position 26, the re-piecing of a thread 7, for example after a thread breakage, is possible in a conventional manner. After piecing, when the thread 7 is being produced normally again, the roller 8 with its holder 21 can again be pivoted into the thread path. It can be advantageous, just as shown in the previous exemplary embodiments, that the roller 8 is attached to its holder 21 on the thread guide 9 and separately or together with the thread guide 9 between the first and second positions 25, 26 and back can be pivoted here.

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

Reference character list

I Spinning station 2 fiber structure

3 drafting system

4 top roller

5 bottom roller

6 exit nip 7 thread

8 roll

9 thread guides

10 runners

I I sleeve 12 thread balloon

13 spinning ring

14 spindle axis

15 axis of rotation

16 yarn path 17 spinning device

18 recording

20 grain level

21 holders

22 False twist device 23 Longitudinal component

24 pivot bearings

25 first position

26 second position

27 cam 28 outer ring

29 first groove

30 second groove 31 clamping ring

32 screw

33 stop

34 stop 35 pin

36 pen

37 carriers

38 Elevation

39 claw 40 guide element

41 sliver

42 dining facility

43 opening roller

44 Spinning rotor 45 Yarn take-off tube

46 threads

47 pair of take-off rollers

48 cheese a angle ß angle

F thread tension

FA axial force component FR radial force component FL component aligned in the direction of the yarn path FT-WIRK vertical component

Claims

P a t e n t claims

1. Method for introducing false twist into a thread (7), wherein a thread running plane (20) is formed by the thread (7) running largely directly in plan view through a drafting system (3) to a spinning device (17) and the thread (7) leaves the drafting system (3) at an exit nip (6) formed by an upper roller (4) and/or a lower roller (5), or the thread running plane (20) through the largely direct path of the thread (7) from a thread draw-off tube when viewed from above (45) of a rotor spinning device (17) to an exit nip point (6) of a pair of take-off rollers (47), the thread (7) between the exit nip point (6) and the spinning device (17) via a slanting path to the thread path level (20) stationary axis of rotation (15) rotating roller (8), the thread (7) simultaneously rotates about its longitudinal axis and thereby introduces a false twist into the thread (7) and the thread (7) between the roller (8) and the spinning device (17) or between the roller (8) and the output nip (6) of the pair of take-off rollers (47) through a thread guide (9), characterized in that the roller (8) is held in at least two positions (25, 26), wherein it is in the first position (25) arranged in the threadline of the thread (7) and driven by the thread (7) and in the second position (26) arranged outside of the threadline and is not driven.

2. The method according to the preceding claim, characterized in that several rollers (8), which adjacent spinning devices (17) are assigned, can be moved simultaneously and / or individually between the first and the second position (25, 26).

3. The method according to one or more of the preceding claims, characterized in that the roller (8) moves jointly, together with the thread guide (9) and/or individually, independently of the thread guide (9) between the first and the second position (25 , 26) is moved.

4. The method according to one or more of the preceding claims, characterized in that the thread (7) by the roller (8) since Lich from the thread running plane (20) is moved out and the thread

(7) wraps around the upper roller (4) or the lower roller (5) after the exit nip (6) in such a way that it introduces a further false twist into the thread (7).

5. The method according to one or more of the preceding claims, characterized in that the thread (7) is raised or lowered relative to the course of the thread (7) without a roller (8) in addition to the lateral deflection.

6. Device for false wire introduction into a thread (7) on a spinning machine, with a roller (8) and a holder (21) for the roller

(8), wherein the roller (8) is rotatably arranged on the holder (21) without a motor drive, characterized in that the holder (21) is attached to a bearing in order to move at least two positions (25, 26) to be able to assume, the first position (25) being such that when the device is used as intended, the roller (8) is arranged in the thread path of the thread (7) and is driven by the thread (7), and in the second position (26 ) is arranged outside of the yarn path and is not driven. 7. Device according to the preceding claim, characterized in that the holder (21) has a guide element (40) for the thread (7).

8. Device according to one or more of the preceding claims, characterized in that the position of the holder (21) is determined by a latching device of the bearing, in particular with a cam or a magnet, and/or by a stop.

9. Device according to one or more of the preceding claims, characterized in that the bearing has a receptacle (18) for attachment to a preferably pivotably mounted thread guide (9) or longitudinal component (23) of the spinning device (17).

10. Spinning machine with a large number of spinning positions (1), each with a drafting system (3) or a thread draw-off pipe (45), a spinning device (17) and a device for introducing false twisting (22) into a thread (7), wherein a thread running plane ( 20) is formed by the largely direct course of the thread (7) through the drafting system (3) to the spinning device (17) when viewed from above, and the drafting system (3) has an exit clamping point (6) with a top roller (4) and/or a lower roller (5) on which the thread (7) leaves the drafting system (3), or the thread running plane (20) due to the course of the thread (7), which is largely direct in plan view, from the thread draw-off pipe (45) of the rotor Spinning device (17) is formed at an output nip (6) of a pair of draw-off rollers (47) and between the output nip (6) and the spinning device (17) a roller (8) with an axis of rotation (15) aligned obliquely to the thread running plane (20). is arranged the running thread (7) rotating about its longitudinal axis when passing the roller (8) and thereby receiving a false twist and entering between the roller (8) and the spinning device (17) or the output clamping point (6) of the pair of take-off rollers (47). Thread guide (9) is arranged and the roller (8) is arranged on a holder (21) so that it can rotate without a motor drive, characterized in that the holder (21) is fastened in a bearing in order to have at least two positions (25 , 26), the first position (25) being such that the roller is located in the threadline of the thread and driven by the thread (7) and in the second position (26) is located outside the threadline and is not driven .

11. Spinning machine according to the preceding claim, characterized in that the holder (21) or the bearing on the thread guide (9) or on a component of the spinning position, in particular on a longitudinal component (23) of the spinning machine, is arranged.

12. Spinning machine according to one or more of the preceding claims, characterized in that the thread guide (9) or the component of the spinning position (1), in particular the longitudinal component (23), is formed from rotatable.

13. Spinning machine according to one or more of the preceding claims, characterized in that the axis of rotation (15) of the rotating roller (8) when viewed in the thread running plane (20) and / or when viewed on the thread running plane (20) with a Angle (a, ß) between 30 ° and 60 ° is arranged obliquely to the yarn path. 14. Spinning machine according to one or more of the preceding claims, characterized in that the roller (8) is arranged in such a way that the thread (7) is raised relative to the course of the thread (7) without a roller (8) in addition to the lateral deflection or is lowered.

15. Spinning machine according to one or more of the preceding claims, characterized in that the roller (8) is arranged in such a way that the thread (7) is deflected laterally out of the thread running plane (20) by the roller (8) and the thread ( 7) after the output nip (6), the upper roller (4) or the lower roller (5) is contacted in such a way that it introduces a second false twist into the thread (7).