CN114144547A

CN114144547A - Spinning machine and method for operating spinning station of spinning machine

Info

Publication number: CN114144547A
Application number: CN202080042408.9A
Authority: CN
Inventors: 西蒙·莫里茨·芬克
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 2019-06-19
Filing date: 2020-06-17
Publication date: 2022-03-04
Also published as: WO2020254416A1; JP7561778B2; JP2022537321A; DE102019116671A1; EP3983584A1

Abstract

The invention relates to a method for operating a spinning station (1) of a spinning machine, wherein during normal operation of the spinning station (1), a yarn (4) is produced from a fibre aggregate (3) fed to the spinning unit (2) by means of the spinning unit (2), the yarn (4) is monitored for the occurrence of yarn defects by means of a yarn sensor (5), the yarn (4) passing through the yarn sensor (5) is guided by a yarn accumulator (6) and then wound onto a bobbin (7). When a yarn defect (8) in the yarn (4) is detected by means of the yarn sensor (5), the normal operation is interrupted, and the yarn defect (8) is removed from the yarn (4) so that the spinning station (1) is again brought into normal operation. The invention proposes that the spinning unit (2) does not produce the thread (4) continuously even during a normal interruption, wherein the thread (4) produced during the normal interruption is temporarily stored by means of a thread storage device (6) and is wound onto a bobbin (7) after the removal of thread defects.

Description

Spinning machine and method for operating spinning station of spinning machine

Technical Field

The invention relates to a method for operating a spinning station of a spinning machine, preferably an air jet spinning machine or a rotor spinning machine, wherein during normal operation of the spinning station a yarn is produced with a fibre aggregate conveyed to the spinning unit by means of a spinning unit of the spinning station, wherein the yarn leaving the spinning unit is monitored for the occurrence of a yarn defect by means of a yarn sensor, wherein the yarn passing through the yarn sensor is guided by a yarn storage and subsequently wound onto a bobbin, and wherein, in the event of a yarn defect in the yarn being detected by means of the yarn sensor, the normal operation is interrupted, the yarn defect is removed from the yarn, and the spinning station is brought back into normal operation.

Furthermore, a spinning machine, preferably an air-jet spinning machine or a rotor spinning machine, is proposed, having at least one spinning station, wherein the spinning station comprises a spinning unit for producing a yarn from a fiber aggregate conveyed to the spinning unit during normal operation of the spinning station, wherein the spinning station comprises a yarn sensor for monitoring the yarn leaving the spinning unit with respect to the occurrence of yarn defects, wherein the spinning station comprises a yarn store and a yarn winding unit, wherein the spinning station is adapted to guide the yarn passing the yarn sensor by means of the yarn store and subsequently wind it onto a bobbin, wherein the spinning machine has a controller which is adapted to interrupt normal operation in the event of a yarn defect in the yarn being detected by means of the yarn sensor, wherein the spinning machine comprises a component adapted to remove a yarn defect from the yarn, and wherein the controller is adapted to, in the event of a yarn defect being removed, so that the spinning station is put back into normal operation.

Of course, the spinning machine according to the invention can also comprise several spinning stations. Particularly preferably, all spinning stations are operated according to the method described below.

Background

The spinning machine of the invention is used for manufacturing yarns from fiber materials which are usually in the form of bundles. The fiber material is conveyed to a spinning unit of a spinning station and is twisted into a yarn by means of the spinning unit. The spinning unit of the spinning station operates, for example, according to the rotor spinning method known from the prior art or the air jet spinning method also generally known. In rotor spinning machines, the fibre assembly is transported to the spinning unit by means of a combing roller. If the spinning machine is designed as an air jet spinning machine, this spinning machine usually has a drafting device, by means of which the fibre assembly is conveyed to the spinning unit.

The yarn produced by the spinning unit is monitored for a defined yarn defect by means of a yarn sensor arranged downstream of the spinning unit in the transport direction of the yarn. A yarn defect is present when one or several selected yarn parameters are above or below a defined threshold value. For example, the hairiness or the yarn thickness can be monitored as a yarn parameter. The yarn sensor may monitor the yarn, for example, optically or capacitively.

If a yarn defect is detected in the yarn conveyed from the spinning unit by the yarn sensor, it is common in the prior art to interrupt the production of the yarn in order to remove the yarn defect from the yarn. To this end, the yarn is cut, so that a first yarn section and a second yarn section are produced. The yarn sections containing the yarn defect are then removed from the corresponding first or second yarn sections and disposed of. A disadvantage of this solution is that the removal of the yarn defect also means a negative effect on the productivity of the corresponding spinning station, since the yarn production needs to be stopped and the production can be resumed after the removal of the yarn defect.

Disclosure of Invention

The object of the invention is therefore to provide a spinning machine or a method for operating a spinning station of a spinning machine, which improves on the known prior art.

The solution of the invention to achieve the above object is a method and a spinning machine having the features of the independent claims.

According to the invention, the method for operating the spinning station of the spinning machine is characterized in that the spinning unit continuously produces the yarn even during the normal operation interruption, wherein the yarn produced during the normal operation interruption is temporarily stored by means of a yarn storage device and is wound onto a bobbin after the yarn defect is removed.

Normal operation is the operation in which the desired yarn is produced by means of the spinning station. In the event that a yarn sensor detects a yarn defect which has a negative effect on the quality of the yarn, so that the yarn defect needs to be removed before the yarn is further processed, this normal operation is interrupted. Including for example, bold or detail.

Unlike the prior art, according to the invention, the production of yarn by the spinning unit is continued during a time-limited interruption of the normal operation. That is, during the removal of the yarn defect, the yarn production is not stopped as is common in the prior art.

The amount of yarn produced during a normal interruption of operation is received by a yarn storage, which preferably comprises a storage drum onto which the yarn is wound and from which the yarn is unwound again after removal of a yarn defect and joining of corresponding yarn sections as described below.

By temporarily storing the yarn from the spinning unit, the yarn section present upstream of the yarn storage can be stopped. This is advantageous because it is easier to remove a yarn fault from a stopped yarn than from a yarn in motion.

That is, according to the invention, if a yarn defect is detected during normal operation, the normal operation is interrupted, wherein the yarn is still being produced by the spinning unit and transferred to the yarn storage. During a normal interruption of operation, this storage is filled accordingly with yarn. Thereby, after the interruption of the normal operation, the yarn is no longer drawn out of the yarn storage at least temporarily, or the amount of yarn drawn out of the yarn storage is reduced compared to the normal operation.

Preferably, during a normal interruption of operation, the yarn is cut between the yarn storage and the bobbin, so as to produce a first yarn section from the yarn storage and a second yarn section from the bobbin. The yarn is cut off, for example, by means of a cutting unit of a spinning station or a service reporter (Servicereporter) running along several spinning stations.

In any case, the yarn is cut in such a way that the first yarn section comprises a yarn defect. Particularly preferably, the yarn is cut with the section of the yarn comprising the yarn defect located in the yarn storage or between the yarn storage and the location where the yarn is cut.

It is particularly preferred to interrupt the winding of the yarn onto the bobbin by braking the bobbin during interruption of normal operation. The bobbin is preferably braked before or during the cutting of the yarn.

Preferably, the yarn is cut before the winding is interrupted. That is, the yarn is preferably cut while the yarn is moving by being wound on the bobbin. For example, the following schemes may be employed: after detecting a yarn defect, the yarn is gripped by a yarn take-off device described in detail below and the yarn is cut by a cutting unit, preferably a cutting unit of the yarn take-off device. Thereby producing the first yarn section described above and a second yarn section also described. Finally, the second yarn section is wound onto the bobbin by means of a bobbin which is rotated all the way around.

Preferably, the second yarn section is also completely wound onto the bobbin. This eliminates the need for sudden braking of the bobbin. Precisely, the bobbin can be braked slowly after a yarn defect has been detected, so that wear of the respective braking device is minimized.

Particularly preferably, the section of the first yarn section comprising the yarn defect is separated from the remaining section of the first yarn section and is disposed of by the yarn removal device.

The thread take-off device is, for example, a suction device connected to the vacuum shaft. During the interruption of normal operation, the first yarn section is sucked into the suction device to a certain extent. At the same time or thereafter, the section of the first yarn section comprising the yarn defect is sucked into the suction device, wherein for this purpose a part of the first yarn section is drawn off from the yarn store. If the section of the first yarn section containing the yarn defect is separated from the remaining section of the first yarn section, the yarn defect can be disposed of by the suction device.

Furthermore, in this phase, the length of the first yarn section continues to increase as the yarn continues to be produced. But the yarn defect in this yarn section has been removed. There is also a second yarn section which is partially or completely wound onto the bobbin. The two yarn sections can then be joined as will be described in further detail below.

As already mentioned, the section of the first yarn section containing the yarn defect is preferably drawn off from the yarn store, separated and disposed of. Preferably, the segments are drawn off after the yarn has been cut.

In particular, a sensor can be provided which detects the occurrence of a yarn defect upstream of the yarn store. This makes it possible to determine whether and when a yarn fault has been removed from the yarn store. This ensures reliable removal of the yarn defect.

It is also particularly preferred that the section of the first yarn section comprising the yarn defect is drawn off and/or disposed of by means of a yarn removal device of the spinning station, which is designed as a suction device. The suction device can be designed, for example, as an elongated suction tube, which is connected to the vacuum shaft.

Furthermore, the thread is preferably cut off by means of a cutting unit of the suction device. That is to say, the cutting unit is a component of the yarn take-off device, in particular a component of the yarn take-off device embodied as a suction device. The cutting unit may be constructed as a knife or scissors, for example. Preferably, the cutting unit is pneumatically operated.

It is also preferred that the remaining section of the first yarn section is connected to the second yarn section after the yarn defect has been removed. The two yarn sections are joined, for example, by a knotting device that knots the two yarn sections together, as is known in the art.

Particularly preferably, the two yarn sections are stationary in the region of the respective connecting device during the connection. During the joining of the yarn sections, the yarn store is therefore preferably filled with yarn which is continuously produced by the spinning unit.

Particularly preferably, the second yarn section is partially unwound from the bobbin before being connected to the remaining section of the first yarn section. That is, the second yarn section is preferably completely wound onto the bobbin before joining. A portion of the second section is then re-unwound from the bobbin by inverting the bobbin. That is, the drive of the bobbin is preferably constructed as a reversible single drive.

Alternatively, the second yarn section may not be completely wound onto the bobbin after the yarn is cut. In this case, an unwound section of the second yarn section is left, which section can then be connected to the first yarn section without the need to invert the bobbin before the connection operation.

Preferably, the remaining section of the first yarn section is connected to the second yarn section by means of a splicing device. Corresponding splicing devices are known from the prior art, and the working principle of the splicing device is not described in detail here. Preferably, the splicing device is a component of the spinning station. If several spinning stations are provided, each spinning station preferably comprises its own splicing device. Alternatively, the splicing device can also be a component of a service robot, which traverses back and forth between the spinning stations.

It is also preferred that the first yarn section is introduced into the splicing device before or during the separation of the section containing the yarn defect. During the splicing operation, the joined areas of the respective yarn segments should be stationary. However, before the original feeding operation (Speisvorgang), it is necessary to insert or insert two yarn sections into the splicing device. This can be done with the movement of the yarn sections. In particular, the interruption of normal operation can be reduced if the first yarn section is already inserted into the splicing device before the section containing the yarn defect is separated out.

It is also particularly preferred that after connecting the remaining section of the first yarn section to the second yarn section, the yarn storage is emptied to a defined filling degree by leading the yarn out of the yarn storage before bringing the spinning station back into normal operation, wherein the led-out yarn is wound onto the bobbin. This is advantageous because during the joining operation of the two yarn sections mentioned, the yarn storage is filled with yarn delivered from the spinning unit during this time period.

The invention also relates to a spinning machine with one or several spinning stations. The spinning station includes one or more controllers. Preferably, each spinning station has its own control unit, which is connected to the central control unit of the spinning machine. Alternatively, the spinning stations are controlled directly by a central control unit. In any case, one or several spinning stations each correspond to a (separate or common) controller adapted to control the respective spinning station in such a way that the spinning unit produces yarn uninterruptedly even during normal operation interruptions. In addition, the following scheme is adopted: the yarn produced during the interruption of normal operation is temporarily stored by means of a yarn storage device and is wound onto a bobbin after the yarn defect has been removed.

That is, the controller is adapted to operate the spinning station according to the method described above or below. The spinning station comprises in particular also one or several of the above-mentioned devices, such as a splicing device. A thread take-off device, which is preferably connected to the vacuum shaft and acts as a suction device, is likewise to be provided. The yarn discharge device can comprise a cutting unit, wherein the cutting unit can also be designed as a separate component of the spinning station or as a separate component of the service robot.

Furthermore, means should be provided for moving the thread sections into the region of the connecting device after the thread has been cut, which connecting device is preferably designed as a splicing device. For example, one or several deflectable suction devices can be used, which are used to suck the respective thread section and move it into the region of the connecting device.

Finally, a yarn storage is provided, which preferably comprises a storage drum, which can be brought into a rotary motion by means of a drive. Furthermore, the yarn storage device should comprise a yarn guiding device, which preferably also can be brought into a rotary motion and is used to draw or unwind the yarn from the yarn storage device. If more yarn is drawn out of the storage by the yarn guiding device than is received into the storage by the rotation of the storage drum, the filling degree of the storage decreases. Whereas the degree of filling is increased if less yarn is drawn off from the storage than is delivered from the spinning unit and wound onto the storage reel.

In any case, the capacity of the yarn store should be sufficient to receive and thus temporarily store the yarn produced by the spinning station during a normal interruption of operation.

During the interruption of normal operation, the production speed of the spinning station, i.e. the length of yarn produced per unit time, can be reduced at least temporarily compared to normal operation. However, the following scheme may also be adopted: the production rate during normal operation is the same as during interruption.

Corresponding yarn stores are described, for example, in EP 2684827 a2, which can also be used in principle within the scope of the invention.

The thread passes through the storage drum in its path to the winding unit, wherein the thread is wound onto the storage drum of the storage drum in the region of the first end side of this storage drum and is removed again in the region of the second end side. By adjusting the amount of yarn on the storage reel, yarn tension fluctuations can be compensated for during normal operation.

Drawings

Further advantages of the invention are described in the examples below. Wherein:

fig. 1 to 7 show an exemplary embodiment of a spinning station of a spinning machine according to the invention at different points in time.

Detailed Description

The figures show selected sections of a spinning station 1 of the spinning machine according to the invention. The spinning machine can of course also comprise several spinning stations as shown.

Fig. 1 shows a spinning station 1 during normal operation. During normal operation, the bundle-like fiber aggregate 3 is conveyed to the spinning unit 2 (e.g., a rotor spinning unit or an air jet spinning unit).

In the spinning unit 2, a yarn 4 is produced from the fibre assembly 3, which is finally drawn off, for example by means of a draw-off roller pair 18 or directly by means of a yarn store 6 described below.

Before the yarn 4 is fed to the storage 6, it passes through a yarn sensor 5, which is preferably arranged between the spinning unit 2 and the pair of draw-off rollers 18 or between the pair of draw-off rollers 18 and the storage 6. If no draw-off roller pair 18 or other draw-off means is provided, the yarn sensor 5 is preferably arranged between the spinning unit and the yarn store 6.

The yarn sensor 5 is used for monitoring one or several yarn parameters of the yarn 4 coming from the spinning unit. By evaluating the signal of the thread sensor 5, the thread 4 can finally be monitored with regard to the presence of a thread defect 8. The yarn defect 8 is, for example, an intolerable thickness or detail. The signals are preferably evaluated by a control unit 20, which is only schematically illustrated in fig. 1 and which is also suitable for controlling the remaining components of the spinning station 1.

As can also be seen from the figure, the yarn store 6 preferably has a storage drum 21 which can be brought into a rotary motion by means of a drive, not shown, in order to wind the yarn 4 from the spinning unit 2. Furthermore, a deflection device 19 for the thread 4 can be provided before the thread storage device 6 and/or after the thread storage device.

The illustrated yarn storage 6 also comprises yarn guiding means 12 which are rotatable about the same axis of rotation as the storage drum 21. By adjusting the ratio of the rotational speeds of the storage drum 21 and the yarn guide 12, the degree of filling of the yarn store 6 can finally be adjusted.

Finally, after the yarn leaves the storage 6, the yarn 4 is wound by means of a winding unit 15 onto a bobbin 7, which can preferably be brought into a rotary motion by means of a drive roller 17.

If a yarn defect 8 is detected by the yarn sensor 5 (see fig. 2, in which the yarn defect 8 has passed the yarn sensor 5), normal operation is interrupted.

As the yarn 4 continues to be produced and wound onto the storage drum 6 by the spinning station 1, the yarn defect 8 gradually moves into the region of the storage drum 21, as shown in fig. 3. At the same time, the thread 4 is deflected in the region of the thread discharge device 13, which is preferably designed as a suction device. To achieve this, the bobbin 7 is decelerated and/or the yarn 4 is guided out of the yarn store 6 faster than in normal operation.

In a next step, the yarn 4 is cut by means of the cutting unit 14, so that a first yarn section 9 and a second yarn section 10 are produced. The first yarn section 9 extends from the spinning position 1 into the region of the yarn take-off device 13. The second yarn section 10 extends from the yarn guiding device 13 to the bobbin 7.

As shown in fig. 4, the drive of the bobbin 7 is continued in the further process, so that the second yarn section 10 is completely wound onto the bobbin 7 (see fig. 5). The section 11 of the first yarn section 9 with the yarn defect 8 is also removed from the yarn store 6 and is guided out by the yarn guide 13.

If the yarn defect 8 has already passed the cutting unit 14 (fig. 5), the section 11 with the yarn defect 8 is separated from the remaining section of the first yarn section 9 and is disposed of by the yarn discharge device 13 (see fig. 6).

In the next step, the remaining section of the first yarn section 9 is connected with the second yarn section 10.

For this purpose, the two

yarn sections

9, 10 are inserted into a connecting device, which is preferably designed as a splicing device 16. During the joining of the two

yarn sections

9, 10, these two yarn sections need to be held in a stationary manner, so that the bobbin 7 needs to be stopped at the latest before the joining. The bobbin 7 is previously inverted to a certain extent so that the second yarn section 10 moves into the region of the splicing device 16.

The first yarn section 9 is likewise stopped in the region of the splicing device 16. However, the spinning unit 2 also continues to produce the yarn 4 at this point in time, so that the yarn store 6 is gradually filled with the yarn 4 from the spinning station 1 (see fig. 6).

Before the maximum filling degree of the yarn storage 6 is exceeded, the two

yarn sections

9, 10 are connected and normal operation is resumed, wherein after the connection the filling degree of the yarn storage 6 is reduced again to the preset target state. This is preferably achieved by briefly accelerating the bobbin 7.

Finally, fig. 7 shows the point in time when normal operation is resumed.

Finally, the invention proposes a method in which a yarn defect 8 can be removed from the yarn 4 without the production of the yarn 4 having to be stopped in the region of the spinning unit 2 for this purpose. That is, the spinning unit 2 also continues to produce the yarn 4 during the entire period of time in which the normal operation is interrupted in order to remove the yarn defect 8. Thereby maximizing the productivity of the spinning station 1.

The invention is not limited to the embodiments shown and described. Variations within the scope of the claims, and any combination of features shown and described, even in different parts of the description or claims, or in different embodiments, are possible without departing from the principle of the independent claims.

List of reference numerals

1 spinning station

2 spinning unit

3 fiber aggregate

4 yarn

5 yarn sensor

6 yarn storage device

7 bobbin

8 yarn faults

9 first yarn section

10 second yarn segment

11 section of the first yarn section comprising a yarn defect

12 yarn guide device

13 yarn leading-out device

14 cutting unit

15 winding unit

16 splicing device

17 drive roller

18 draw-off roller pair

19 deflection device

20 controller

21 storage reel

Claims

1. A method for operating a spinning station (1) of a spinning machine, wherein the spinning machine is preferably an air jet spinning machine or a rotor spinning machine,

-wherein during normal operation of the spinning station (1), a yarn (4) is produced with the aid of a spinning unit (2) of the spinning station (1) with the fibre aggregate (3) fed to the spinning unit (2),

-wherein the yarn (4) leaving the spinning unit (2) is monitored for the occurrence of yarn defects by means of a yarn sensor (5),

-wherein the yarn (4) passing the yarn sensor (5) is guided by a yarn storage (6) and subsequently wound onto a bobbin (7), and

-wherein, in case a yarn defect (8) in the yarn (4) is detected by means of the yarn sensor (5), the normal operation is interrupted, the yarn defect (8) is removed from the yarn (4) and the spinning station (1) is brought back into normal operation,

characterized in that the spinning unit (2) produces the yarn (4) uninterruptedly even during normal operation interruptions, wherein the yarn (4) produced during normal operation interruptions is temporarily stored by means of the yarn storage (6) and wound onto the bobbin (7) after removal of yarn defects.

2. Method according to the preceding claim, characterized in that the yarn (4) is cut between the yarn storage (6) and the bobbin (7) during a normal interruption of operation, so as to produce a first yarn section (9) from the yarn storage (6) and a second yarn section (10) from the bobbin (7), wherein the first yarn section comprises the yarn defect (8).

3. Method according to any one of the preceding claims, characterized in that the winding of the yarn (4) onto the bobbin (7) is interrupted during a normal interruption of operation by braking the bobbin (7).

4. Method according to any one of the preceding claims, characterized in that the yarn (4) is cut before the winding is interrupted.

5. Method according to any one of the preceding claims, characterized in that the second yarn section (10) is completely wound onto the bobbin (7) during a normal interruption of operation.

6. Method according to any of the preceding claims, characterized in that the section (11) of the first yarn section (9) comprising the yarn defect (8) is separated from the remaining section of the first yarn section (9) and is disposed of by a yarn lead-out device (13).

7. Method according to any of the preceding claims, characterized in that a section (11) of the first yarn section (9) comprising the yarn defect (8) is first drawn off from the yarn store (6), and the section (11) is separated and disposed of.

8. Method according to any of the preceding claims, characterized in that a section (11) of the first yarn section (9) comprising the yarn defect (8) is drawn off and/or the yarn section (9) is disposed of by means of a yarn lead-out device (13) of the spinning station (1) configured as a suction device.

9. Method according to any one of the preceding claims, characterized in that the yarn (4) is cut by means of a cutting unit (14) of the suction device.

10. Method according to any of the preceding claims, characterized in that the remaining section of the first yarn section (9) is connected to the second yarn section (10) after the removal of the yarn defect (8).

11. Method according to any of the preceding claims, characterized in that the second yarn section (10) is partially unwound from the bobbin (7) before being connected with the remaining section of the first yarn section (9).

12. Method according to any one of the preceding claims, characterized in that the remaining section of the first yarn section (9) is connected with the second yarn section (10) by means of a splicing device (16).

13. Method according to any one of the preceding claims, characterized in that the first yarn section (9) is introduced into the splicing device (16) before or during the separation of the section (11) comprising the yarn defect (8).

14. Method according to any of the preceding claims, characterized in that after connecting the remaining section of the first yarn section (9) with the second yarn section (10), before bringing the spinning station (1) back into normal operation, a yarn storage (6) is emptied to a defined filling degree by leading the yarn (4) out of the yarn storage (6), wherein the led-out yarn (4) is wound onto the bobbin (7).

15. Spinning machine with at least one spinning station (1), wherein the spinning machine is preferably an air jet spinning machine or a rotor spinning machine,

-wherein the spinning station (1) comprises a spinning unit (2) for producing a yarn (4) from a fibre aggregate (3) conveyed to the spinning unit (2) during normal operation of the spinning station (1),

-wherein the spinning station (1) comprises a yarn sensor (5) for monitoring the yarn (4) leaving the spinning unit (2) for the presence of yarn defects (8),

-wherein the spinning station (1) comprises a yarn store (6) and a winding unit (15), wherein the spinning station (1) is adapted to guide the yarn (4) passing the yarn sensor (5) through the yarn store (6) and subsequently to be wound onto a bobbin (7),

-wherein the spinning machine has a controller (20) adapted to interrupt normal operation in case of a yarn defect (8) in the yarn (4) detected by means of the yarn sensor (5),

-wherein the spinning machine comprises means adapted to remove said yarn defect (8) from the yarn (4),

and wherein the controller (20) is adapted to re-enter the spinning station (1) into normal operation in case the yarn defect (8) is removed,

characterized in that the controller (20) is adapted to control the spinning station (1) in such a way that the spinning unit (2) produces yarn (4) uninterruptedly even during normal operation interruptions, wherein the yarn (4) produced during normal operation interruptions is temporarily stored by means of the yarn storage (6) and wound onto the bobbin (7) after removal of the yarn defect (8).