DE102020118327A1 - Method and device for false twist introduction and spinning machine - Google Patents

Abstract

The invention relates to a method, a device and a spinning machine for introducing false twists into a thread (7), with a thread running plane (20) due to the largely direct course of the thread (7) in plan view through a drafting system (3) to a spinning device (17). is formed and the yarn (7) leaves the drafting system (3) at an exit nip point (6) formed by an upper roller (4) and/or a lower roller (5). The thread (7) runs between the output clamping point (6) and the spinning device (17) over a roller (8) rotating about an axis of rotation (15) that is inclined to the thread running plane (20) and at the same time rotates about its longitudinal axis, whereby a false twist is introduced into the thread (7). The thread (7) runs through a thread guide (9) between the roller (8) and the spinning device (17). The roller (8) is held in at least two positions (25, 26), in the first position (25) being arranged in the thread path of the thread (7) and driven by the thread (7) and in the second position (26 ) is arranged outside of the threadline 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 thread running largely directly in plan view through a drafting system to a spinning device and the thread leaving the drafting system at an exit nip point formed by an upper roller and/or a lower roller . The thread runs between the output clamping point and the spinning device over a roller rotating about an axis of rotation that is inclined to the thread running plane, the thread simultaneously rotating about its longitudinal axis and thereby introducing a false twist into the thread. The thread runs through a thread guide between the roller and the spinning device. 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.

the US 2,718,111A 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 mounted can be rotated around the worm. The roller always remains driven and in the direction of the grain. The drive of the roll is energy-intensive and must be matched to the speed of the thread.

From the DE 6941966 U discloses a device for false twisting of monofilaments or filament yarns made of linear high polymers by wrapping around a rotatable roller arranged at an angle to the running direction of the monofilaments or filament yarns. 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 revolution that 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, particularly 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 thread running largely directly in plan view through a drafting system to a spinning device. The thread leaves the drafting system at an exit nip point formed by an upper roller and/or a lower roller, with the thread running between the exit nip point and the spinning device over a roller rotating about an axis of rotation at an angle to the plane of the thread run, with the thread simultaneously rotating about its longitudinal axis and introduces a false twist into the thread. The thread runs through a thread guide between the roller and the spinning device.

According to the invention the roller is held in at least two positions, in the first position it 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 driven.

Accordingly, the roller does not have its own drive, but is driven exclusively 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. The introduction of the false twist takes place exclusively by the fact that the thread is deflected from the roller from its original plane of thread travel and the axis of the roller is aligned at an angle to the longitudinal axis of the thread. This creates lateral forces on the thread, which rotate the thread about its longitudinal axis and thus introduce a false twist into the thread.

Due to the possibility that the roller is held in at least two positions, the roller can be driven by the thread in the first position. In the second position, the roller is no longer in the thread path 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 interfering with this. 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 the second position. In particular, with a simultaneous movement of the rollers from the first to the second position and vice versa, in a spu When changing the reels at several spinning positions, the corresponding preparation can be carried out quickly and reliably by removing the reels from the bobbin changing area. 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 individual adjustment of each individual spinning position with regard 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 roller is moved between the two positions together with the thread guide, 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 is to be used selectively for introducing the false twist, it is advantageous if the roller can be moved between the two positions independently of the thread guide, that is to say individually in relation 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 exit nip 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. The spinning stability can be significantly increased by the two points at which the false twist is introduced into the yarn, without the quality of the yarn produced suffering as a result of 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 when 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 twist into a thread on a spinning machine has a roller and a holder for the roller. The roller is rotatably arranged on the holder without a motor drive. 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 roller 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 a false twist device. The particular advantage of the device attached to the spinning machine is that the roll can be arranged in a position during operation that is optimal for the false twist, but on the other hand due to the second position for a bobbin change and a piecing process at a non-interfering point can be placed.

It is also advantageous if the bearing is a rotary bearing or a sliding 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 sliding bearing, the roller with its holder can be moved between the two positions by a linear or arcuate displacement. Here, too, it should be ensured that the respective position can be maintained independently, preferably without additional aids, and must first be actively actuated in order to move from this one position to the other position.

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 one active beta ment 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 designed 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 at the same time as 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 comprises a drafting system, a spinning device and a device for introducing false twist into a thread. A thread running plane is formed by the largely direct course of the thread through a drafting system to the spinning device in a top view, and the drafting system has an exit nip with an upper roller and/or a lower roller, at which the thread leaves the drafting system. Between the output clamping point and the spinning device, a roller with an axis of rotation aligned obliquely to the plane of the thread run is arranged as a device for introducing false twist into a thread, with the running thread rotating about its longitudinal axis as it passes the roller and thereby receiving a false twist. A thread guide is arranged between the roller and the spinning device. 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 driven is. 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 false twist or the roll 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 arranging the bearing or the device on the thread guide, the roller can be moved together with the thread guide from the thread engagement of one position to the other position in which there is no thread engagement. 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 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 positions. 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 comparison to the course of the thread without a roller in the plane of the thread run, in addition to the lateral deflection. The thread ver thus runs above or below the normal course of the thread, as it would be without the false twisting device according to the invention. If the thread run is raised, the operation of the spinning position is simplified, especially when attaching a thread. If, on the other hand, the yarn path is lowered, i.e. closer to the machine than with the normal yarn path, a robot patrolling along the spinning machine can drive past the spinning position without the risk of colliding with the yarn.

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 introduces a second 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. The spinning stability can be significantly increased by the two points at which the false twist is introduced into the yarn, without the quality of the yarn 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 roller is temporarily pivoted out of the yarn path. Thus, when the sleeve is raised - and especially when doffing - the thread guide and roller are to be 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 on one side of the machine can be moved out of the doffer area 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 holder and roller holder can be positioned axially together using 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 sits on the holder 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 half-shell 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 thread guide and screwed or clipped onto the holder of the thread guide.

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

The spinning speed can be increased or the yarn dre hung be 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 yarn spun, make the inclined roller an extremely interesting spinning component.

The invention is designed in accordance with the preceding description, with the features mentioned being able to be present individually or in any combination.

• 1 eine Seitenansicht einer Spinnstelle einer Ringspinnmaschine,
• 2 eine Vorderansicht einer Spinnstelle einer Ringspinnmaschine,
• 3 eine Seitenansicht einer Spinnstelle mit nach oben ausgelenktem Faden gemäß 2,
• 4 eine Vorderansicht mit nach rechts ausgelenktem Faden,
• 5 eine Rolle mit umgelenktem Faden,
• 6 eine Seitenansicht einer erfindungsgemäßen Falschdrahtvorrichtung,
• 7 eine Vorderansicht einer erfindungsgemäßen Falschdrahtvorrichtung,
• 8 eine Seitenansicht der Falschdrahtvorrichtung aus 7,
• 9 eine Vorderansicht einer weiteren erfindungsgemäßen Falschdrahtvorrichtung,
• 10 eine Seitenansicht der Falschdrahtvorrichtung aus 9,
• 11 eine Vorderansicht einer weiteren erfindungsgemäßen Falschdrahtvorrichtung und
• 12 eine Seitenansicht der Falschdrahtvorrichtung aus 11.

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

• 1 a side view of a spinning position of a ring spinning machine,
• 2 a front view of a spinning position of a ring spinning machine,
• 3 a side view of a spinning position with the thread deflected upwards according to FIG 2 ,
• 4 a front view with the thread deflected to the right,
• 5 a roll with deflected thread,
• 6 a side view of a false twisting device according to the invention,
• 7 a front view of a false twisting device according to the invention,
• 8th Figure 12 shows a side view of the false twisting device 7 ,
• 9 a front view of another false twisting device according to the invention,
• 10 Figure 12 shows a side view of the false twisting device 9 ,
• 11 a front view of another false twisting device according to the invention and
• 12 Figure 12 shows a side view of the false twisting device 11 .

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 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 the individual case.

1 shows a side view of a spinning position 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 compression 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 small sieve belt and generates a negative pressure. The top roller 4 or the bottom roller 5 presses onto the screen apron and also clamps the fiber structure 2 at a corresponding output clamping point 6. From the output clamping point 6, a twisted thread 7 is formed from the fiber structure 2. The thread 7 then reaches a false twisting device 22, in which it wraps around a roller 8 set at an angle to the thread path, then passes through a thread guide 9 to a spinning device 17. The spinning device 17 comprises a rotor 10 and a sleeve 11, onto which the thread 7 is wound will. 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 clamping point 6 and the thread guide 9, the thread 7 runs 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 thread path 16 indicated by dashed lines and lifts it out of this thread path 16 . In this side view, the roller 8 is pivoted at an angle β of between 30° and 60° to the normal thread path 16 . 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 .

2 shows a front view of the spinning station 1 of a ring spinning machine. In this representation, the roll 8 can be seen as it is arranged at the spinning station 1. 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 strand 2 through the drafting system 3 and further along this line through the spindle axis 14. How As can be seen from this representation, the thread 7 remains on its way from the drafting system 3 to the thread guide 9 in this thread running plane 20. Smaller deviations from this due to the thread 7 clinging to the roller 8 or due to the rotation of the thread guide 9 are not taken into account. The thread running plane 20 corresponds essentially to the plane of the drawing 1 .

From this representation of 2 it is clearly evident that the roller 8 is arranged inclined at an angle α to the thread running plane 20 . The thread 7 runs obliquely over the roller 8, as a result of which tangential forces arise on the thread 7, which introduce a false twist into the thread 7.

3 shows a side view of a spinning position 1 with the thread deflected upwards according to FIG 2 . The roller 8 is positioned at an angle to the thread path, so that a false twist is produced in the thread 7 . The roller 8 and the thread guide 9 are arranged above the sleeve 11. 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.

In 4 a front view of the spinning station 1 with the roller 8 is shown, 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 representations of 1 , 2 and 3 . Here, too, the inclination of the roller 8 can be in the direction other than that shown. Likewise, the thread instead of up, as with 1 shown to be pushed down. While when depicting the 1 the thread 7 contacts the upper roller 4 after the nip 6 and thereby receives another false twist, according to FIG 3 the thread 7 free after the clamping point 6. After the nip point 6, it no longer has any contact with the upper roller 4 or the lower roller 5 and therefore does not receive any false wire from these two rollers.

In 5 the forces on the thread 7 and the roller 8 are shown. 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 F _A in the axial direction and a component F _R in the radial direction. The roller 8 is driven by the radial force component F _{R .} Due to the axial component F _A, the yarn 7 moves along the envelope surface of the roller 8. The axial component F _A may turn into an aligned in the direction of yarn running component F _L and in an axis perpendicular to the yarn axis component F _{T ACTIVE} be disassembled. The component F _{T-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 insertion depends on the diameter of the roller 8, the coefficient of friction of the outer 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 used and the ease of movement of the roller 8.

The optimum angle of inclination of the roller 8 for inserting the false twist is in the range of 30° - 60° to the line of the yarn path 16 of the undeflected yarn 7 (see Fig 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. However, rollers 8 with a defined braking torque can also be used to optimize the insertion of the false twist.

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

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. Frictional forces occur 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. The thread friction to be overcome acts only to a small extent as a torsional moment for false twist initiation on the thread 7. The maximum possible initiation of false twist twists is limited by the maximum possible thread tension.

The thread tension increase 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 yarn tension forces, a significantly higher torsional moment can be exerted on the yarn 7.

In 6 a side view of a false twisting device 22 is shown. 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 path of the thread. This rectilinear course of the thread 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 a spinning position 1, preferably along several spinning positions 1.

A pivot bearing 24 is arranged on the holder 21 . The pivot bearing 24 enables 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 tube 11 or also when piecing the thread 7 after a thread breakage or onto an empty tube 11.

In order to be able to assume both the first position 25 and the second position 26 in a stable manner, a locking device is arranged in the rotary 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 turning 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.

In 7 1 is a front sectional view of one embodiment of the false twister 22. FIG. In this exemplary embodiment, the longitudinal component 23 is a rod which runs along the spinning machine and which can be made rotatable about its axis. A clamping ring 31 is provided on the longitudinal component 23 for the axial fixing of the false twisting device 22 and is fastened to the longitudinal component 23 in a rotationally fixed manner by means of a screw 32 . 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 .

8th shows a side view of the 7 on average. From this it can be seen that the clamping ring 31 has two stops 33 and 34 . With the stops 33 and 34 correspond pins 35 and 36 which are attached to the holder 21. 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. Pin 36 also corresponds to stop 34 and thus locks holder 21 in the opposite direction of rotation. The roller 8 with its holder 21 can thus be locked in two positions, which correspond to the positions 25 and 26 . By rotating the rod of the longitudinal component 23, it is also possible for the holder 21 to be rotated from its first position 25, in which the stop 34 and the pin 36 abut, into its second position 26, in which the stop 33 and the pin 35 collide.

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 the 7 and 8th also show them 9 and 10 12 is a front view and a side view of a false twisting device 22 in section. As seen from the front view of the 9 As can be seen, the holder 21 of the roller 8 has a receptacle 18 with which it is clipped onto a holder 37 fixed axially to the clamping ring 31 . The holder 37 supports the thread guide 9 which is arranged in the vicinity of the roller 8. About the holder 37 of 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 thread guide 9 is held in its intended working position by the pin 36, which rests against the stop 34. The roller 8, which is firmly connected to the holder 37 of the thread guide 9 is, is thus also in its first position. To reach the second position, the roller 8 is pivoted backwards about the longitudinal component 23 . An edge of the holder 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 thread guide 9 in a very simple manner. Hardly any conversion measures are therefore required, which is why this is a particularly advantageous and cost-effective variant of the present invention.

Another embodiment of the present invention with front and side views is shown in FIGS 11 and 12 shown. The longitudinal member 23 is surrounded by the holder 37 for the yarn guide 9 and the holder 21 of the roller 8. Both holders 37 and 21 can be rotated about the longitudinal member 23. They are in turn fixed by the clamping ring 31 in their axial direction. The two holders 37 and 21 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 holder 37 of the thread guide 9 strikes the stop 34 of the clamping ring 31. In this position, the holder 21 contacts an elevation 38 of the holder 37. If required, the roller 8 with its holder 21 can be rotated about the longitudinal component 23 into the second position 26, with an edge of the holder 21 striking the stop 33 of the clamping ring 31 , like it in 12 is shown with a dashed line. The holder 37 with the thread guide 9 can continue to remain in the first position 25. Alternatively, in addition to the holder 21, the holder 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 holder 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 between the two positions 25 and 26 together.

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

Reference List

1

spinning position

2

fiber bandage

3

drafting system

4

top roller

5

bottom roller

6

output terminal point

7

thread

8th

role

9

thread guide

10

runner

11

sleeve

12

thread balloon

13

spinning ring

14

spindle axis

15

axis of rotation

16

grainline

17

spinning device

18

admission

20

grain plane

21

holder

22

false twist device

23

longitudinal member

24

pivot bearing

25

first position

26

second position

27

cam

28

outer ring

29

first groove

30

second groove

31

clamping ring

32

screw

33

attack

34

attack

35

pen

36

pen

37

holder

38

elevation

a

angle

β

angle

f

thread tension

FA

axial force component

FR

radial force component

FL

component aligned in the direction of the grain

FT EFFECT

vertical component

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• US 2718111A [0002]
• DE 6941966 U [0003]

Claims (15)

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) forming the drafting system (3) at an exit nip (6) formed by an upper roller (4) and/or a lower roller (5), the thread (7) between the exit nip (6) and the spinning device (17) over a slanted angle the axis of rotation (15) standing in relation to the plane (20) of the thread running, the thread (7) rotates around its longitudinal axis at the same time, introducing a false twist into the thread (7) and the thread (7) between the roller (8) and the spinning device (17) runs through a yarn 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) in the yarn path of the yarn (7) and driven by the thread (7). and is located in the second position (26) outside of the yarn path and is not driven. Method according to the preceding claim, characterized in that a plurality of rollers (8) associated with adjacent spinning devices (17) can be moved simultaneously and/or individually between the first and second positions (25, 26). 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. Method according to one or more of the preceding claims, characterized in that the thread (7) is moved laterally out of the thread running plane (20) by the roller (8) and the thread (7) moves the upper roller (4 ) or wraps around the bottom roller (5) in such a way that it introduces another false twist into the thread (7). Method according to one or more of the preceding claims, characterized in that the thread (7) is raised or lowered compared to the course of the thread (7) without a roller (8) in addition to the lateral deflection. Device for introducing false twist into a thread (7) on a spinning machine, with a roller (8) and a holder (21) for the roller (8), the roller (8) being rotatable on the holder (21) without a motor drive, is arranged, characterized in that the holder (21) is attached to a bearing in order to be able to assume at least two positions (25, 26), the first position (25) being such that when the device is used as intended, the roller ( 8) located in the threadline of the thread (7) and driven by the thread (7) and in the second position (26) located outside the threadline and not driven. Device according to the preceding claim, characterized in that the bearing is a rotary bearing (24) or a sliding bearing. 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. 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). Spinning machine with a large number of spinning positions (1), each with a drafting system (3), a spinning device (17) and a device for introducing false twists (22) into a thread (7), with a thread running plane (20) through the largely direct top view course of the thread (7) through a drafting system (3) to the spinning device (17) and the drafting system (3) has an exit clamping point (6) with an upper roller (4) and/or a lower roller (5) on which the thread (7) leaves the drafting system (3), and between the exit clamping point (6) and the spinning device (17) there is a roller (8) with an axis of rotation (15) aligned obliquely to the thread running plane (20), with the running thread (7) rotates about its longitudinal axis when passing the roller (8) and thereby receives a false twist and between the roller (8) and the spinning device (17) a thread guide (9) is arranged and the roller (8) on a holder ( 21) is rotatably arranged without a motor drive t, characterized in that the holder (21) is fixed in a bearing in order to be able to assume at least two positions (25, 26), the first position (25) being such that the Roller is arranged in the threadline of the thread and is driven by the thread (7) and in the second position (26) is arranged outside the threadline and is not driven. Spinning machine according to the preceding claim, characterized in that the holder (21) or the bearing is arranged on the thread guide (9) or on a component of the spinning station, in particular on a longitudinal component (23) of the spinning machine. 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 rotatable. Spinning machine according to one or more of the preceding claims, characterized in that the axis of rotation (15) of the rotating roller (8) is at an angle (α , β) is arranged at an angle of between 30° and 60° to the grain. 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 or lowered compared to the course of the thread (7) without roller (8) in addition to the lateral deflection . 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) at the same time after the exit nip point (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).

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