CN106222819B

CN106222819B - Spinning device of air spinning machine and operation method thereof

Info

Publication number: CN106222819B
Application number: CN201610377623.XA
Authority: CN
Inventors: A·斯蒂芬; G·沙夫勒; M·威德曼
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 2015-06-02
Filing date: 2016-05-31
Publication date: 2020-11-13
Anticipated expiration: 2036-05-31
Also published as: JP2016223060A; DE102015108706A1; CN106222819A

Abstract

The invention relates to a method for operating a spinning device of an air spinning machine, wherein a fiber bundle (3) is conveyed to a spinning nozzle (1) of the spinning device by means of a feeding device (8) during a spinning operation, wherein a twist is imparted to the fiber bundle (3) within the spinning nozzle (1) by means of a swirling air flow, such that a yarn (2) having a twist is generated by the fiber bundle (3), and wherein the yarn (2) is drawn out of the spinning nozzle (1) in a predefined spinning direction (S) by means of a drawing-out device (11). According to the invention, a spinning start process is carried out before a spinning run is carried out, during which a yarn end (21) guided back by the spinning nozzle (1) counter to the spinning direction (S) is superimposed on the start (22) of the fiber strand (3) and is conveyed together with the same through the spinning nozzle (1) and exposed there to a swirling air flow, wherein the ratio between the withdrawal speed of the withdrawal device (11) and the feed speed of the feed device (8) determining the spinning tension differs at least temporarily during the spinning start process from the respective ratio present during the spinning run. In addition, an air spinning machine for carrying out the method is also proposed.

Description

Spinning device of air spinning machine and operation method thereof

Technical Field

The invention relates to a method for operating a spinning device of an air spinning machine, wherein a fiber bundle is conveyed to a spinning nozzle of the spinning device by means of a feeding device during a spinning operation, wherein a twist is imparted to the fiber bundle within the spinning nozzle by means of a swirling air flow, such that a yarn with a twist is produced from the fiber bundle, and wherein the yarn is drawn out of the spinning nozzle in a predetermined pattern direction by means of a drawing-out device.

In addition, an air spinning machine having at least one spinning device is proposed, wherein the spinning device has: a spinning nozzle having an inlet for the fibrous material and an outlet for a yarn produced from the fibrous material by means of a swirling air flow in the spinning nozzle; a feeding device for feeding the fiber material into the spinning nozzle; and a drawing device for drawing the yarn from the spinning nozzle.

Background

Such air spinning machines are used for producing yarns from elongate fiber bundles by means of a swirling air flow generated in a swirling chamber by respective air nozzles. For this purpose, the fiber strand is conveyed in the direction of the spinning nozzle by means of a feed device, which is preferably formed by a pair of delivery rollers of a drafting device, which are arranged upstream of the spinning nozzle in the spinning direction, and the yarn is sucked or sucked in by means of underpressure. The fiber bundle finally reaches the interior of the spinning nozzle and there reaches the inlet mouth region of the spindle-shaped yarn-forming element. The outer fibers of the fiber bundle are wound around the inner fiber (core) in the inlet mouth region by means of the generation of a swirling air flow by the air nozzle, so that a stable yarn is produced as a result, which is finally drawn out of the swirling chamber through the draw-out channel by means of a draw-out device arranged outside the spinning nozzle and wound onto the sleeve by means of a winding device.

If a spinning fault (thick or thin position of the yarn, yarn breakage, insufficient transport of the fiber bundle, etc.) occurs during the spinning process or if the spinning machine is stopped within a certain time period, the spinning process is required after a corresponding event that interrupts the yarn production. In this case, the spool-side end of the already produced yarn (i.e. the end section of the yarn section wound last before the interruption of the yarn production) or the correspondingly provided auxiliary yarn is guided back into the swirl chamber through the withdrawal channel counter to the actual spinning direction and there through the inlet into the region upstream of the spinning nozzle. The yarn is guided back in such a way that it is located in the region of the feed device of the spinning device and is fixed by the feed device. Immediately after the return, the yarn is brought into contact with the beginning of the supplied fiber strand (the beginning of the fiber strand being formed by the region located in the region of the spinning device at the start of the spinning process) within the spinning nozzle by means of a service robot, the own equipment of the spinning device or manually by overlapping one another.

Finally, the yarn end and the start of the fiber strand together with it are pulled into the interior of the swirling chamber by opening the air nozzle and by activating the drawing device and are exposed there to the swirling air flow, wherein at this point in time the feed device is also or has been put into operation in order to transport the fiber strand or the yarn end in the direction of the inlet of the spinning nozzle. The connecting or overlapping region between the yarn end and the start of the fiber strand finally passes through the inlet of the spinning nozzle and, within the swirl chamber, through the inlet mouth of the yarn-forming element. In this case, the spinning process continues as usual, i.e. the spinning device is again operated in the spinning operation and produces the yarn.

Even if a connection region between the yarn ends and the fiber bundles (hereinafter also referred to as "adapter") is already available by the spinning process, the connection region is still visible in the finished yarn due to the overlapping of the yarn ends and the fiber bundles. Likewise, in the region of the joining body there may be a lower yarn strength which likewise corresponds negatively to the yarn produced.

Disclosure of Invention

It is therefore an object of the present invention to further improve the described spinning process.

This object is solved by a method and an air spinning machine as described below.

According to the invention, a method for operating a spinning device of an air spinning machine is proposed, wherein a fiber bundle is fed to a spinning nozzle of the spinning device by means of a feeding device during a spinning operation, wherein a twist is imparted to the fiber bundle within the spinning nozzle by means of a swirling air flow, such that a yarn with a twist is produced from the fiber bundle, and wherein the yarn is drawn out of the spinning nozzle in a predefined spinning direction by means of a drawing device.

The feed device is preferably a pair of delivery rollers of a drafting device, which is arranged upstream of the spinning nozzle in the spinning direction and by means of which the fiber strand is drafted to a defined fineness or evenness before entering the spinning nozzle. Of course, the feed device can also be formed by a pair of feed rollers which are present in addition to the drafting device.

The drawing-off device is preferably designed as a pair of drawing-off rollers, wherein the yarn is guided in a clamped manner between two drawing-off rollers driven by means of a drive device and is drawn off from the spinning nozzle. Immediately after the withdrawal device, a winding device is preferably arranged, by means of which the withdrawn thread is wound onto the sleeve.

Finally, it is provided that before the spinning run is carried out (i.e. generally after the spinning run before the interruption), a spinning start process is carried out during which the yarn end guided back through the spinning nozzle counter to the spinning direction is superimposed on the beginning of the fiber strand and is conveyed together with it through the spinning nozzle and exposed there to the swirling air flow.

Since the composite of fiber strand fed into the spinning nozzle and yarn drawn off from the spinning nozzle is a continuous fiber strand, the ratio between the drawing-off speed of the drawing-off device (i.e. the speed of the yarn drawn off by the drawing-off device) and the feed speed of the feed device (i.e. the speed of the fiber strand transported by the feed device) influences the so-called spinning tension (spinning tension is the tension acting on the fiber strand) during the spinning run and also during the spinning process.

It has now been shown that it is advantageous for a high-quality combination if the spinning tension during the spinning process differs at least temporarily from the spinning tension prevailing during the spinning run.

According to the invention, it is therefore proposed that the ratio between the withdrawal speed of the withdrawal device and the feed speed of the feed device, which determines the spinning tension, differs at least temporarily during the spinning process from the respective ratio prevailing during the spinning run. In this way, the spinning tension can be optimally matched to the spinning-up process, so that the precondition for a more stable or less visible joining body is provided in comparison with the prior art. The quality, in particular the uniformity, of the yarn produced can thus be improved.

In particular, it has proven possible to provide a ratio which is different from the ratio which exists during the spinning run (only) if the overlap region between the yarn end and the start of the fiber strand is located in the region of the swirling air flow within the swirling chamber. In other words, the ratio can in particular correspond at the beginning of the spinning process, during which the overlap region between the yarn end and the fiber bundle is still outside the spinning nozzle or the swirl chamber, to the ratio that was selected or selected during the spinning run after or before the spinning process. It is also advantageous that the ratio is not abruptly changed but smoothly from a value selected during the spinning run to a value expected during the corresponding phase of the spinning process.

It is likewise conceivable for the ratio to be changed at least temporarily during the spinning process. The ratio can be varied, for example, on the basis of a ramp or curve stored in the control device or in the form of a ramp or curve. Furthermore, the change of the ratio during the spinning process can be carried out smoothly or stepwise, wherein the two types of change can also be carried out offset in time from one another and can be interrupted by a period of time during which the ratio remains constant.

It is therefore advantageous that the ratio is different during the spinning process from the ratio which exists during the spinning run at least until the yarn end which overlaps the start of the fiber strand has passed through the region of the spinning nozzle in which the swirling air flow is applied to the yarn end and the start of the fiber strand.

It is also advantageous if the ratio is at least temporarily higher during the spinning process than during the spinning operation. The spinning tension is thereby increased during the spinning-up process compared to the spinning run, whereby the overlap region of the yarn end and the fiber bundle is lengthened to a greater extent than if the spinning tension were unchanged. This results in an increase in the yarn strength in the region of the splice and a visually uniform appearance. In this case, the increase or subsequent decrease of the ratio to the value expected during the spinning run can take place abruptly or smoothly. It is particularly advantageous if the absolute value of the ratio is 0.1% to 5% higher during at least part of the spinning process than during the spinning run.

It has also proven advantageous if the ratio has an absolute value of 0.90 to 1.05, preferably 0.95 to 1.00, during the spinning operation. The absolute value is preferably less than 1, i.e. the withdrawal speed is less than the feed speed. This makes it possible to produce a yarn having high quality in terms of strength and visual appearance.

It is also advantageous if the ratio has an absolute value of 0.95 to 1.10, preferably 0.95 to 1.05, during the spinning operation. This ratio is preferably in the stated range during at least part of the spinning process, in particular when the overlap region between the yarn ends and the fiber bundles passes through the swirl chamber. Furthermore, the ratio is preferably at least temporarily greater than 1.

It is also advantageous if the ratio is selected during the spinning run and/or during (at least part of) the spinning process as a function of one or more parameters of the fiber bundle. The ratio should be determined, in particular, as a function of the fineness or the desired strength of the material or fiber strand and the fineness of the yarn produced therefrom, since the ratio and the resulting spinning tension have a significant influence on the subsequent yarn properties. It is also advantageous if the ratio is selected during the spinning run and/or during (at least part of) the spinning process taking into account one or more characteristic variables of the spinning device, such as the spinning speed or the air pressure of the compressed air available for the swirling air flow within the swirling chamber.

It is particularly advantageous to vary the ratio by varying the feed rate of the feed device and/or varying the extraction rate of the extraction device. The feed device and/or the extraction device should in particular be operatively connected to their own drive in order to be able to individually adjust the feed speed and/or the extraction speed. For example, the ratio may be increased by increasing the withdrawal speed and decreasing the feed speed. The reduction in the ratio will eventually be increased by reducing the withdrawal speed and increasing the feed speed.

However, it is particularly advantageous to vary the ratio by changing either the feed rate of the feed device (with a constant withdrawal rate) or the withdrawal rate of the withdrawal device (with a constant feed rate). In this case, only one of the two variables has to be changed at all times. If the feed device is part of a drafting device arranged upstream of the spinning nozzle in the spinning direction or is arranged downstream of the drafting device, the rotational speed of the (remaining) drafting device rollers should of course also be adapted accordingly when the feed speed is changed. When changing the withdrawal speed of the withdrawal device, the rotational speed of the winding device arranged downstream of the withdrawal device should likewise be adapted.

It is particularly advantageous if the spinning device comprises a draw-off roller pair forming the draw-off device and a winding device arranged downstream of the draw-off roller pair in the spinning direction for winding the thread onto the sleeve, wherein the winding speed of the winding device is also increased if the draw-off speed of the draw-off roller pair is increased or the winding speed of the winding device is also reduced if the draw-off speed of the draw-off roller pair is reduced.

The invention further relates to an air spinning machine having at least one spinning device, wherein the spinning device has: a spinning nozzle having an inlet for the fibrous material and an outlet for a yarn, which is produced from the fibrous material in the spinning nozzle by means of a swirling air flow; a feeding device for feeding the fiber material into the spinning nozzle; and a drawing device for drawing the yarn from the spinning nozzle. The spinning device can be operated or carried out in particular according to the previous and/or following description, wherein the described aspects can be implemented in any combination or individually, as long as there is no technical conflict.

In any case, according to the invention, the spinning device has means for varying the ratio between the withdrawal speed of the withdrawal device and the feed speed of the feed device, which determines the spinning tension (as regards the feed device, possible embodiments of the withdrawal device and the remaining features of the spinning device, see the previous and following description). The device is in particular a separate drive for the extraction device and/or the feed device, so that the ratio can be changed: by varying the rotational speed of the respective drive means, either the feed rate or the withdrawal rate (or both) can be varied. The feed device and/or the extraction device are preferably connected to the individual drives assigned to them only.

It is also advantageous if the spinning device is operatively connected to a control device which is designed to change the ratio at least temporarily during the spinning process relative to the ratio which is present during the spinning operation. The control device is intended in particular to be designed to operate the spinning device according to one or more of the aspects described in the claims and/or the description.

It is particularly advantageous if the drawing-off device of the drafting device of the spinning device, in particular the pair of drawing-off rollers forming the drawing-off device and/or the feed device, in particular the pair of delivery rollers forming the feed device, is/are operatively connected to a separate drive, or if the feed device and the drawing-off device are operatively connected to one another by means of a transmission having at least two gear stages. In this way, the ratio can be changed in a simple manner during the spinning-up process to a value that differs from the corresponding value during the spinning run.

Drawings

Further advantages of the invention are described in the following examples. The figures are as follows:

fig. 1 schematically shows a schematic view of a spinning device of an air spinning machine according to the invention during a spinning run;

FIG. 2 shows schematically a cross-sectional view of a spinning nozzle of a spinning device of an air spinning machine according to the present invention;

fig. 3 schematically shows the spinning device according to fig. 1 after interruption of the yarn production;

fig. 4 schematically shows the spinning device according to fig. 1 after the yarn end has been guided back counter to the spinning direction; and

fig. 5 schematically shows the spinning device according to fig. 1 during the spinning-up process.

Detailed Description

Fig. 1 shows a cut-out of a spinning device of an air spinning machine according to the invention (wherein the air spinning machine can of course have a plurality of spinning devices preferably arranged next to one another). The air spinning machine can, if necessary, comprise a drawing frame 13 with a plurality of drawing frame rollers 12, which drawing frame 13 is supplied with the fiber bundle 3, for example in the form of a double drawing belt. In addition, the spinning device shown comprises a spinning nozzle 1, which is further shown in fig. 2 and has an internal swirl chamber 5, in which swirl chamber 1 the fiber strand 3 or at least a part of the fibers of the fiber strand 3 are provided with a twist after passing through the inlet 4 of the spinning nozzle 1 (the exact mode of action of the spinning device will be described further below).

Besides, the air spinning machine may comprise a drawing-off device 11 arranged after the spinning nozzle 1 and having, for example, two drawing-off rollers 14, and a winding device 7 connected after the drawing-off device 11 for winding the yarn 2 leaving the spinning device onto a sleeve. The spinning device according to the invention does not necessarily have to have a drafting device 13. The draw-off roller 14 may also be replaced by alternative draw-off means 11.

The spinning device shown generally operates according to the air spinning method. In order to form the thread 2, the fiber bundle 3 is guided in the spinning direction S and by means of a feed device 8 (which can be formed, for example, by a pair of delivery rollers 20 of the drafting device 13) through a fiber guiding element 15 having the inlet 4 into the swirl chamber 5 of the spinning nozzle 1. There, it acquires a twist, that is to say at least a part of the free fiber ends of the fiber bundle 3 is caught by a swirling air flow which is generated by air nozzles 18 which are respectively arranged in the wall of the swirling chamber surrounding the swirling chamber 5, wherein the air nozzles 18 are fed with compressed air by an air distribution device 17 (for example annular and connected to the air supply conduit 16). Here, a part of the fibers is drawn at least a distance from the fiber bundle 3 and is wound around the tip of the yarn forming element 10 projecting into the swirl chamber 5.

By drawing the fiber bundle 3 out of the swirling chamber 5 through the inlet mouth 25 of the yarn forming element 10 via the draw-off channel 24 arranged in the yarn forming element 10 and finally drawing the fiber bundle 3 out of the spinning nozzle 1 through the outlet 6, the free fiber end is finally also drawn in the direction of the inlet mouth 25 and is here coiled as a so-called wound fiber on a centrally extending core fiber — a yarn 2 with the desired twist is obtained.

The compressed air introduced via the air nozzle 18 finally leaves the spinning nozzle 1 via the suction channel 24 and the air outlet 19, if present, which air outlet 29 can be connected to a negative pressure source if required.

During the manufacture of the yarn, it should not be excluded: thick or thin positions of the yarn 2 result for different reasons. In this case, the yarn production is interrupted by the control unit, so that a bobbin-side yarn end 21 is produced. The yarn end 21 can be located after the interruption of the yarn production on the surface of the bobbin in the winding device 7 or in the area between the winding device 7 and the spinning nozzle 1, preferably between its outlet and the withdrawal device 11 (see fig. 3). During the yarn production, undesirable yarn breaks can likewise result, which likewise lead to the respective yarn end 21 and the beginning of the fiber strand 3 remaining in the region of the respectively stopped drawing frame 13 or feed device 8.

In order to be able to carry out the yarn production again, i.e. the spinning operation of the corresponding spinning device, the yarn end 21 must be connected to the beginning of the fiber bundle 3. For this purpose, provision is made for: the yarn end 21 is guided counter to the spinning direction S by the yarn nozzle 1, wherein for this purpose the spool located in the winding device 7 is driven backwards in order to release the corresponding amount of yarn. The yarn end 21 or the yarn end 21 regenerated by removing the yarn section with yarn failure is at this stage conveyed by means of mechanical or pneumatic means into the region of the outlet 6 of the spinning nozzle 1 and sucked therein by means of the underpressure present in the extraction channel 24.

By means of a corresponding swirling air flow, the yarn end 21 is finally conveyed further past the inlet 4 of the spinning nozzle 1 until it is located in the region before the spinning nozzle 1 (seen in the spinning direction S). It is particularly advantageous here if the yarn ends 21 are moved until they are located between the two outlet-side drawing device rollers 12 of the drawing device 13, which rollers 12 are configured as a feed device 8 (for this purpose, the drawing device rollers 12 are moved away from one another before the yarn ends 21 pass in order to achieve said passing; after the yarn ends 21 have passed, they are finally again brought into the position shown in fig. 4, in which the yarn ends 21 are held in a clamped manner).

In a next step, the feed device 8 (in the example shown, the drawing device roller 12 on the outlet side, to which the yarn end 21 is fixed), the draw-off device 11 (in the example shown, the draw-off roller 14) and the winding device 7 are now put into operation again, so that the yarn end 21 is moved in the spinning direction S. At the same time or with a time shift backwards, the remaining drawing frame rollers 12 are also again activated, the beginning of their rotation and the corresponding rotational speed being adapted such that the beginning 22 of the fiber strand 3 can come into overlapping contact with the yarn end 21 and be drawn together with it into the spinning nozzle 1. The corresponding overlap region 23 is shown in fig. 5.

As can now be gathered from fig. 1, the tension acting on the fiber strand running between the feed device 8 and the draw-off device 11, which is formed by the fiber strand 3 and the yarn 2 produced by it in the spinning nozzle 1, as a spinning tension, is determined or influenced by the feed speed of the feed device 8 and/or the draw-off speed of the draw-off device 11. If, for example, the withdrawal speed is increased without changing the feed speed, the spinning tension is also increased.

The invention therefore provides, as described in detail above, that the ratio between the withdrawal speed of the withdrawal device 11 and the feed speed of the feed device 8 differs at least temporarily during the described spinning-up process from the respective ratio which exists during the spinning operation.

In particular, this ratio should be increased by increasing the withdrawal speed and/or reducing the feed speed during the time period shown during which the overlap region 23 passes through the spinning nozzle 1, in order to improve the properties of the coupling. After passing through the overlap region 23, the ratio is finally reduced to the value set for the spinning run in order to produce a high-quality yarn 2.

In order to be able to vary the feed speed and/or the withdrawal speed independently, the withdrawal device 11 and/or the feed device 8 and/or the winding device 7 can be operatively connected to a separate drive 9 (single drive), as is illustrated in fig. 5 by way of example for the remaining figures.

The invention is not limited to the embodiments shown and described. Modifications within the scope of the claims are likewise possible, such as any combination of the features described, even if they are shown and described in different parts of the description or claims or in different embodiments.

List of reference numerals

1 spinning nozzle

2 yarn

3 fiber bundle

4 inlet of spinning nozzle

5 vortex chamber

6 outlet of spinning nozzle

7 winding device

8 feeding device

9 drive device

10 yarn forming element

11 extraction device

12 drafting device roller

13 drafting device

14 draw-off roller

15 fibre guide element

16 air supply duct

17 air distribution device

18 air nozzle

19 air outlet

20 output roller pair

21 yarn ends

22 beginning of fiber bundle

23 overlap region between yarn end and beginning region of fiber bundle

24 extraction channel

25 entrance mouth of yarn forming element

S direction of spinning

Claims

1. A method for operating a spinning device of an air spinning machine, wherein a fiber bundle (3) is fed to a spinning nozzle (1) of the spinning device by means of a feeding device (8) during a spinning operation, wherein a twist is imparted to the fiber bundle (3) within the spinning nozzle (1) by means of a swirling air flow, such that a yarn (2) having a twist is produced from the fiber bundle (3), and wherein the yarn (2) is drawn out of the spinning nozzle (1) in a predefined spinning direction (S) by means of a drawing-out device (11);

it is characterized in that the preparation method is characterized in that,

before the spinning run is carried out, a spinning start process is carried out, during which a yarn end (21) guided back by the spinning nozzle (1) against the spinning direction (S) is superimposed on the start (22) of the fiber bundle (3) and is conveyed together with the same through the spinning nozzle (1) and is exposed there to the swirling air flow, wherein the ratio between the withdrawal speed of the withdrawal device (11) and the feed speed of the feed device (8) determining the spinning tension differs at least temporarily during the spinning start process from the respective ratio existing during the spinning run.

2. Method according to claim 1, characterized in that the ratio during the spinning-up process is different from the ratio existing during the spinning run at least until the yarn end (21) overlapping the start (22) of the fiber bundle (3) has passed the area of the spinning nozzle (1) where the swirling air flow is applied to the yarn end (21) and the start (22) of the fiber bundle (3).

3. Method according to claim 1, characterized in that the ratio is at least temporarily higher during the spinning process than during the spinning run.

4. A method according to claim 1, characterised in that the ratio has an absolute value during a spinning run in the range 0.90 to 1.05.

5. A method according to claim 1, characterised in that the ratio has an absolute value during a spinning run in the range 0.95 to 1.00.

6. The method according to claim 1, characterized in that the ratio has an absolute value during the spinning process of 0.95 to 1.10.

7. The method according to claim 1, characterized in that the ratio has an absolute value during the spinning process of 0.95 to 1.05.

8. Method according to claim 1, characterized in that the ratio is selected during the spinning run and/or during the spinning process as a function of one or more parameters of the fiber bundle (3) and/or the yarn (2) and/or one or more characteristic variables of the spinning device.

9. Method according to claim 1, characterized in that the ratio is changed by changing the feed speed of the feed device (8) and/or changing the extraction speed of the extraction device (11).

10. Method according to one of claims 1 to 8, characterized in that the ratio is changed by changing the feed speed of the feed device (8) while the extraction speed of the extraction device (11) is kept constant or vice versa.

11. Method according to one of claims 1 to 8, characterized in that the ratio is changed at least temporarily during the spinning process.

12. Method according to claim 1, characterized in that the spinning device comprises a draw-off roller pair which forms the draw-off device (11) and a winding device (7) arranged downstream of the draw-off roller pair in the spinning direction (S) for winding the yarn (2) onto the sleeve, wherein the winding speed of the winding device (7) is also increased if the draw-off speed of the draw-off roller pair is increased or the winding speed of the winding device (7) is also decreased if the draw-off speed of the draw-off roller pair is decreased.

13. An air spinning machine having at least one spinning device, wherein the spinning device has:

a spinning nozzle (1) having an inlet (4) for the fibre material and an outlet (6) for a yarn (2) produced from the fibre material by means of a swirling air flow in the spinning nozzle (1);

a feeding device (8) for feeding the fiber material into the spinning nozzle (1); and

a drawing-off device (11) for drawing off the yarn (2) from the spinning nozzle (1),

it is characterized in that the preparation method is characterized in that,

the spinning device comprises a device for changing the ratio of the drawing speed of the drawing device (11) and the feeding speed of the feeding device (8) to determine the spinning tension; and is

The spinning device is operatively connected to a control device, and the control device is designed to change the ratio during the spinning process at least temporarily in relation to the corresponding ratio during the spinning operation.

14. An air spinning machine according to claim 13, characterised in that the control device is configured to make the ratio higher during the spinning-up process at least temporarily in relation to the corresponding ratio during the spinning run.

15. Air spinning machine according to one of claims 13 to 14, characterized in that the extraction device (11) and/or the feed device (8) are/is in operative connection with a separate drive device (9) or with each other by means of a transmission device having at least two gear stages.

16. Air spinning machine according to claim 15, characterised in that the extraction device (11) is constituted by a pair of extraction rollers.

17. Air spinning machine according to claim 15, characterised in that the feeding device (8), the drafting device (13) of the spinning device is formed by a pair of delivery rollers (20).