DE102021108779A1 - Method for operating a spinning machine and spinning machine - Google Patents

Abstract

The present invention relates to a method for operating a spinning machine (2), in which a first yarn (6) is spun from a fiber structure (5) in a spinning unit (3) during a spinning process. According to the invention, it is proposed that a second yarn (8) be kept ready, with a yarn change being carried out if necessary, in which the first yarn (6) is replaced by the second yarn (8), with the second yarn (8) being fed into the spinning unit (3) is introduced and the spinning process is then carried out with the second yarn (8). The invention also relates to a spinning machine (2) with at least one work station (1), the at least one work station (1) having a spinning unit (3) which is designed to spin a first yarn (6) from a fiber structure (5). It is proposed that the spinning machine (2) has a yarn changing device (7) which is designed to hold a second yarn (8) ready and, if necessary, to carry out a yarn change in which the first yarn (6) is replaced by the second yarn (8). becomes.

Description

The present invention relates to a method for operating a spinning machine, a first yarn being spun from a fiber structure in a spinning unit during a spinning process. The invention also relates to a spinning machine with at least one work station, the at least one work station having a spinning unit that is designed to spin a first yarn from a fiber structure.

Spinning machines for producing a yarn from fibers have been known for a long time. Modern spinning machines operate largely autonomously and can produce yarn at a variety of independent workstations. Various spinning techniques are known. These include, for example, rotor, air and ring spiders. Different levels of automation of jobs are known. Usually, the work stations are trained to independently feed a fiber bundle to a spinning unit and to wind the yarn produced onto a bobbin. In a further level of automation, the workstations are, for example, able to independently exchange a fully wound bobbin for an empty tube. However, such tasks can also be taken over by at least one service unit, which patrols, for example, along the machine sides of the spinning machine and the work stations arranged next to one another.

Another automated work step that can be taken over by an autonomous work station or by a service unit is independent piecing, i. H. the start or resumption of the spinning operation after an intentional or unintentional standstill. For this it is usually necessary to find a yarn end that may have run onto a spool, to prepare it and to return it to the spinning unit. This can be a lengthy process during which yarn production is at a standstill, at least at the affected work station. In order to increase the productivity of a spinning machine, it is therefore desirable to make this process as efficient as possible.

The object of the present invention is therefore to reduce the time required for piecing or renewed piecing after a yarn breakage on a spinning machine.

The object is achieved by a method for operating a spinning machine and a spinning machine having the features of the independent patent claims.

In the method according to the invention for operating a spinning machine, a first yarn is spun from a fiber structure in a spinning unit during a spinning process. According to the invention, it is proposed that a second yarn is kept ready, with a yarn change being carried out if necessary, in which the first yarn is replaced by the second yarn, with the second yarn being introduced into the spinning unit and the spinning process then being carried out with the second yarn .

The method according to the invention enables the spinning process to be continued or started very quickly. A downtime of a work station of the spinning machine is thus reduced and consequently the productivity of the spinning machine is increased overall. For example, it is not necessary to find the yarn end of the first yarn that has run onto the spool before continuing the spinning process. The need mentioned above arises, for example, when yarn breaks, when changing bobbins and possibly when piecing for the first time. The second yarn is preferably already prepared for the spinning process before the yarn change. For example, one end of the second yarn is at least partially untwisted and held ready for insertion into the spinning unit. When changing the yarn, the first yarn preferably assumes the position of the second yarn and vice versa, with the first yarn being prepared for a new yarn change after the yarn change, for example.

The yarn change is preferably carried out automatically by a yarn changing device, the yarn changing device being able to be arranged, for example, at the work site or in a service unit of the spinning machine.

It is advantageous if the first yarn is assigned to a first bobbin and the second yarn is assigned to a second bobbin, with the first bobbin also being replaced by the second bobbin when the yarn is changed. This also contributes to a rapid continuation of the spinning process, since the respective yarn is already connected to a bobbin and can be wound up immediately after the spinning process has been continued. In particular, the first yarn is wound onto the first bobbin during a spinning process. After the yarn change, for example, the second yarn is wound onto the second bobbin accordingly. If the workplace or a service unit of the spinning machine is already equipped with a device for changing the bobbin, this can also be used when changing the yarn. It is conceivable that the first coil and the second coil are arranged on a multiple coil holder, the is designed to swap the positions of the coils.

It is particularly advantageous if the second yarn is kept ready at least at one work station or in a service unit of the spinning machine. Compared to the prior art, both options reduce the downtime of the work station, for example in the event of a yarn breakage. If the second twine is kept ready at the work site, the work site must have a corresponding device. This makes the construction of the jobs more complex, but a yarn change can be done independently of the other jobs on the spinning machine. If the second yarn is kept ready in a service unit of the spinning machine, a corresponding device can be dispensed with at the work stations. However, the number of simultaneous yarn changes is limited to the number of service units on the spinning machine.

It is also advantageous if one end of the second yarn is prepared for a piecing operation during the spinning process of the first yarn. The second yarn is thus prepared for immediate further spinning during the spinning process. The piecing process means joining one end of the already spun yarn to the fibers of the starting material of the spinning process. The preparation includes, for example, finding the end of the second yarn, at least partially unwinding the second yarn and/or untwisting the end of the second yarn. After the yarn change, one end of the first yarn is preferably also prepared in this way, so that immediate piecing is also made possible after another yarn change.

It is also advantageous if a pair of take-off rollers is opened before the yarn change and is closed again after the yarn change. Inserting the second yarn into the pair of take-off rollers is thus considerably simplified. The pair of pull-off rollers usually has the function of pulling the spun yarn out of the spinning unit and feeding it to a winding unit for winding.

There are also advantages if the spinning unit includes a spinneret that is opened before the yarn is changed and is closed again after the yarn is changed. In air-jet spinning machines, spinnerets produce a yarn from a fiber structure by means of a circular air flow. Opening and closing the spinneret makes changing the yarn and a subsequent piecing process much easier, since there is no need to laboriously insert the end of the yarn into the spinneret. For this purpose, the spinneret can in particular be hinged.

Furthermore, it is advantageous if the first yarn is assigned to a first spinneret and the second yarn is assigned to a second spinneret, the first spinneret also being replaced by the second spinneret when the yarn is changed. This also eliminates the previously described opening and closing of the spinneret.

It is conceivable that the second spinneret is kept ready at the work site or in a service unit. The spinneret that is not involved in the spinning process can, for example, be cleaned until the next yarn change or replaced with a new spinneret in the event of advanced wear.

The spinning machine according to the invention comprises at least one work station, the at least one work station having a spinning unit which is designed to spin a first yarn from a fiber structure. It is proposed that the spinning machine has a yarn changing device which is designed to keep a second yarn ready and, if necessary, to carry out a yarn change, in which the first yarn is replaced by the second yarn. The yarn changing device can significantly reduce the time required for piecing again, for example after a yarn breakage, compared to the prior art. This increases the overall productivity of the spinning machine.

The spinning machine can be designed, for example, as an air, rotor or ring spinning machine. The spinning machine can have a large number of work stations arranged next to one another. In addition, the spinning machine can have at least one service unit for carrying out automated maintenance work at the work stations. The yarn changing device can, for example, have devices for holding and/or tensioning as well as drive rollers for unwinding the second yarn. In addition, the yarn changing device can have actuators for carrying out the yarn change. As already mentioned above, the need for a yarn change can arise, for example, when a yarn breaks, when a bobbin is changed or possibly when piecing for the first time.

In an advantageous development of the spinning machine, the yarn changing device is arranged at the at least one work station or at a service unit. The advantages and disadvantages of these two options have already been described above. When arranged at the work site, a twine change is independent of others Work stations possible, however, the additional yarn changing device at the work station may increase the costs of the spinning machine. If the yarn changing device is arranged on a service unit of the spinning machine, a corresponding device can be dispensed with at the work stations. However, the number of simultaneous yarn changes is limited to the number of service units on the spinning machine.

It is also conceivable to provide a yarn changing device for several work stations that is not arranged in a service unit. For example, a yarn changing device can be assigned to two work stations of the spinning machine, with the yarn changing device being designed to optionally carry out a yarn change at one of the work stations.

It is also advantageous if the yarn changing device has a yarn end sensor and/or a yarn end preparation device. This can increase the chances of success for a successful piecing process after the yarn change. The yarn end sensor is designed, for example, to identify a yarn end and possibly to evaluate its suitability for a piecing process. The yarn end sensor can be designed, for example, as an optical sensor and in particular as a camera.

The yarn end preparation device is designed in particular to prepare the yarn end for a piecing process. This may include, for example, severing an end portion of the yarn and at least partially untwisting the yarn end. This makes it more likely that there will be a strong connection between the yarn end and the fibers added in the restarted spinning process.

It is also extremely advantageous if the yarn changing device comprises at least one suction device. Suction devices adapted to be subjected to negative pressure are known as means for yarn or fiber handling. Accordingly, it is advantageous to provide such a suction device in the yarn changing device. For example, the suction device can include a movable tube that follows the movement of the yarn during the yarn change. It is also conceivable to provide several suction devices.

For example, a first suction device can locate the yarn end that may have accumulated on the spool after a yarn break by rotating the spool at an opening of the first suction device that is subjected to negative pressure. After finding the end of the yarn, the yarn can be at least partially unwound from the bobbin, for example. A second suction device can be provided, for example, to form a yarn reserve in the form of a loop during the yarn change. This reduces the likelihood of twine damage during twine changes.

It is particularly advantageous if the spinning unit comprises a spinneret. As already described, the spinneret is part of an air-jet spinning machine. The spinneret, which can in particular be opened up, enables the yarn to be changed and subsequent piecing to be started again in a particularly simple manner. Accordingly, the spinneret can be opened before the yarn change, the second yarn can then be inserted into the spinneret and the spinneret can be closed again after the yarn change. The possibility of opening it up is also advantageous for cleaning the spinneret.

There are also advantages if the spinning unit includes a first spinneret and the spinning machine has at least one second spinneret. As already described above, the spinning nozzles can also be changed in parallel with the yarn change in this case. A re-piecing can thus take place particularly quickly. The spinneret that is not involved in the spinning process can be serviced, i. H. cleaned or replaced. The second spinneret can be provided, for example, at the work site or in a service unit. The second spinneret is in particular part of the yarn changing device.

It is advantageous if the at least one work station has a first bobbin holder for a first bobbin of the first yarn and the spinning machine has at least one second bobbin holder for a second bobbin of the second yarn. The first bobbin can thus also be replaced by the second bobbin during the yarn change. This means that an additional spooling process is not necessary during the yarn change, which reduces the time required for the gear change. Likewise, after the spinning process has been resumed, the resulting yarn can be wound up further immediately. The second bobbin holder can be arranged, for example, at the at least one work station. It is also conceivable that the second bobbin holder is arranged in a service unit.

It is also advantageous if the first bobbin holder and the second bobbin holder are arranged on a common arm at the at least one work station. The common arm can, for example, be designed in such a way that with a movement of the arm, the positions of the first bobbin holder and the second bobbin can be exchanged holder takes place. In this case, the arm is designed differently than a multiple coil holder. A thread or bobbin change can be carried out particularly quickly by moving the arm. The arm can have an axis of rotation, for example, with the two coil holders in particular rotating about this axis of rotation when the arm is rotated. It is also conceivable that the arm has one or more additional bobbin holders, which make it easier, for example, to exchange a fully wound bobbin for an empty tube.

In detail, a yarn changing process on the spinning machine according to the invention according to the method according to the invention could look like this: First, as part of the spinning process, a first yarn is produced from fibers of a raw material in a spinning unit, which is drawn off from a winding unit and wound onto a first bobbin. Meanwhile, a second yarn with an end prepared for a piecing process is kept ready in a yarn changing device. The second yarn was partially unwound from a second spool, for example by means of one or more drive rollers. The second yarn is, for example, at least partially tensioned and connected to at least one actuator which is designed to feed the second yarn to the spinning unit and the winding unit. A yarn breakage of the first yarn occurs as a result of which the spinning process is stopped and the yarn end of the first yarn runs onto the first spool. The first bobbin is removed from the winding unit, for example by changing places with a second bobbin on which the second yarn is at least partially wound. The second yarn is fed to the spinning unit and the winding unit, and in particular, a second bobbin of the second yarn is inserted into the winding unit. A piecing process then takes place with the previously prepared end of the second yarn, as a result of which the spinning process can be continued with the second yarn. During the spinning process of the second yarn, the end of the first yarn can be found on the first bobbin in the yarn changing device, the first yarn can be at least partially unwound, for example by means of one or more drive rollers, and the yarn end of the first yarn can be prepared for a new piecing process. In addition, the first yarn can be connected to the at least one actuator and possibly at least partially tensioned. Accordingly, if the second yarn breaks again, a new yarn change can take place, in which the second yarn is replaced by the now prepared first yarn. Consequently, a continuous change between the yarns can take place until a maximum package size of one of the yarns is reached. The downtime in the event of an unintentional interruption of the spinning process is thus reduced.

• 1 eine schematische Seitenansicht einer Arbeitsstelle eines ersten Ausführungsbeispiels der erfindungsgemäßen Spinnmaschine,
• 2 eine schematische Seitenansicht einer Arbeitsstelle eines zweiten Ausführungsbeispiels der erfindungsgemäßen Spinnmaschine,
• 3 eine schematische Seitenansicht einer Arbeitsstelle eines dritten Ausführungsbeispiels der erfindungsgemäßen Spinnmaschine, und
• 4 eine schematische Seitenansicht einer Arbeitsstelle eines vierten Ausführungsbeispiels der erfindungsgemäßen Spinnmaschine.

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

• 1 a schematic side view of a work station of a first embodiment of the spinning machine according to the invention,
• 2 a schematic side view of a work station of a second embodiment of the spinning machine according to the invention,
• 3 a schematic side view of a work station of a third embodiment of the spinning machine according to the invention, and
• 4 a schematic side view of a work station of a fourth embodiment of the spinning machine according to the invention.

In the following description of the figures, the same reference symbols are used for features that are identical and/or at least comparable in the various figures. The individual features, their design and/or mode of action are usually only explained in detail when they are first mentioned. If individual features are not explained in detail again, their design and/or mode of action corresponds to the design and mode of action of the features already described that have the same effect or have the same name.

1 shows a schematic side view of a work station 1 of a first exemplary embodiment of the spinning machine 2 according to the invention. In this example, the spinning machine 2 is designed as an air-jet spinning machine. Accordingly, the work station 1 has a spinning unit 3 with a spinneret 4 . The spinning unit 3 is designed to spin a first yarn 6 from a fiber structure 5 .

The spinning machine 2 also has a yarn changing device 7 in which a second yarn 8 is held ready. The yarn changing device 7 is designed to carry out a yarn change if required, in which the first yarn 6 is replaced by the second yarn 8 . The yarn changing device 7 has, for example, drive rollers 9 which are designed to unwind the yarn 6 , 8 from the spools 10 , 12 .

The first yarn 6 is assigned, for example, to a first spool 10 which is arranged in a first spool holder 11 of the work station 1 . The second yarn 8 is assigned to a second bobbin 12 which is arranged in a second bobbin holder 13 of the yarn changing device 7 . The yarn changing device 7 is designed in particular in the course to replace the first bobbin 10 with the second bobbin 12 when changing the yarn.

The yarn changing device 7 has, for example, a first suction device 14 which is designed in particular to locate a yarn end that has run onto one of the bobbins 10 , 12 . In addition, the yarn changing device 7 has, for example, a second suction device 15 which is designed to receive part of the second yarn 8 in the form of a loop. This ensures that the second yarn 8 is tense during the yarn change, but does not tear immediately under load, since yarn can be replenished from the loop in the second suction device 15 .

The yarn changing device 7 additionally has, for example, a yarn end sensor 16 which is designed to detect an end of the yarn 6, 8 and, for example, to evaluate the suitability for a piecing process. The yarn changing device 7 can also have a yarn end preparation device 17 which is designed to prepare one end of the yarn 6, 8 for a piecing process. Such a preparation can include, for example, severing part of the yarn 6, 8 and partially untwisting it.

The work station 1 comprises a pair of take-off rollers 18 that pulls the spun yarn 6, 8 out of the spinning unit 3. The pair of take-off rollers 18 is designed, for example, in such a way that it can be opened before a yarn change and closed again after the yarn change. In addition, the spinneret 4 is preferably designed to be hinged. The spinneret 4 can thus also be opened before the yarn change and closed again after the yarn change.

The yarn changing device 7 is arranged in a service unit 19, for example. The service unit 19 patrols, for example, along a large number of work stations 1 (not shown) of the spinning machine 2. In the event of a yarn breakage at one of the work stations 1, the service unit 19 is requested to have the yarn changing device 7 carry out a yarn change at the corresponding work station 1. However, the yarn changing device 7 can also be part of the work station 1 with the same features as already described.

2 shows a to 1 similar exemplary embodiment of a spinning machine 2 according to the invention, the spinning machine 2 in this case being designed as a rotor spinning machine. Correspondingly, the work station 1 has a spinning rotor 20 and opening rollers 21 . The opening rollers 21 serve to open the fiber structure 5 into its fiber components, the fiber components being spun into the first yarn 6 in the spinning rotor 20 rotating at very high speeds. In this embodiment, the second yarn 8 must also be introduced into the spinning rotor 20 when changing yarn. In particular, the yarn changing device 7 is designed in this way.

3 shows a spinning machine 2 similar to the first exemplary embodiment, with the difference that in addition to the first spinneret 4 of the spinning unit 3 of the work station 1, a second spinneret 22 is also provided, with which the first spinneret 4 can be replaced. Preferably, the spinning nozzles 4, 22 are exchanged during the yarn change. Hereby a downtime of the work station 1, for example after a yarn breakage, can be additionally reduced. After the spinneret 4, 22 has been exchanged, the spinneret 4, 22 not involved in the spinning process can, for example, be serviced and in particular cleaned or exchanged for a new spinneret 4, 22.

The second spinneret 22 is preferably arranged in the yarn changing device 7 . If the yarn changing device 7 is arranged in the service unit 19, the second spinneret 22 can optionally be used for changing at different work stations 1. If the yarn changing device 7 is arranged at the work station 1, the second spinneret 22 is assigned exclusively to the work station 1, for example.

If necessary, the yarn changing device 7 is designed to introduce the first yarn 6 back into the first spinning nozzle 4 after the yarn has been changed and the spinning nozzles 4, 22 have been exchanged. The first spinneret 4 and/or the second spinneret 22 can be designed to be hinged. On the one hand, this facilitates cleaning and, on the other hand, reintroduction of the yarn 6, 8 into the spinneret 4, 22.

4 shows a further exemplary embodiment of the spinning machine 2 according to the invention. In this example, the yarn changing device 7 is firmly connected to the work station 1 or the yarn changing device 7 is part of the work station 1. The first bobbin holder 11 and the second bobbin holder 13 are arranged here on a common arm 23 . The arm 23 is mounted in particular in such a way that the positions of the first bobbin holder 11 and the bobbin holder 13 can be exchanged, for example by rotating about an axis of rotation. A yarn change and an exchange of the spools 10, 12 can thereby take place particularly quickly. It is conceivable that bobbin holders 11, 13 arranged in this way can also be used to exchange a fully wound bobbin 10, 12 for an empty bobbin the. It is also conceivable that further coil holders 11, 13 are connected to the arm 23.

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 features, even if they are shown and described in different exemplary embodiments.

Reference List

1

place of work

2

spinning machine

3

spinning unit

4

Spinneret, first spinneret

5

fiber bandage

6

first yarn

7

twine changing device

8th

second yarn

9

drive roller

10

first coil

11

first spool holder

12

second coil

13

second spool holder

14

first suction device

15

second suction device

16

yarn end sensor

17

Yarn end preparation device

18

pair of pull-off rollers

19

service unit

20

spinning rotor

21

opening rollers

22

second spinneret

23

poor

Claims (15)

A method for operating a spinning machine (2), wherein a first yarn (6) is spun from a fiber structure (5) in a spinning unit (3) during a spinning process, characterized in that a second yarn (8) is kept ready, with a yarn change is carried out, in which the first yarn (6) is replaced by the second yarn (8), the second yarn (8) being introduced into the spinning unit (3) and the spinning process then being carried out with the second yarn (8). becomes. Method according to the preceding claim, characterized in that the first yarn (6) is associated with a first bobbin (10) and the second yarn (8) is associated with a second bobbin (12), with the first bobbin (10 ) is replaced by the second coil (12). Method according to one of the preceding claims, characterized in that the second yarn (8) is kept ready at at least one work station (1) or in a service unit (19) of the spinning machine (2). Method according to one of the preceding claims, characterized in that one end of the second yarn (8) is prepared for a piecing operation during the spinning process of the first yarn (6). Method according to one of the preceding claims, characterized in that a pair of take-off rollers (18) is opened before the yarn change and is closed again after the yarn change. Method according to one of the preceding claims, characterized in that the spinning unit (3) comprises a spinning nozzle (4) which is opened before the yarn change and is closed again after the yarn change. Method according to one of the preceding claims, characterized in that the first yarn (6) is assigned to a first spinneret (4) and the second yarn (8) is assigned to a second spinneret (22), the first spinneret ( 4) is replaced by the second spinneret (22). Spinning machine (2) with at least one work station (1), wherein the at least one work station (1) has a spinning unit (3) which is designed to spin a first yarn (6) from a fiber structure (5), characterized by a yarn changing device ( 7) which is designed to keep a second yarn (8) ready and, if necessary, to carry out a yarn change, in which the first yarn (6) is replaced by the second yarn (8). Spinning machine (2) according to the preceding claim, characterized in that the yarn changing device (7) is arranged at the at least one work station (1) or at a service unit (19). Spinning machine (2) according to one of the preceding claims, characterized in that the yarn changing device (7) has a yarn end sensor (16) and/or a yarn end preparation device (17). Spinning machine (2) according to one of the preceding claims, characterized in that the yarn changing device (7) comprises at least one suction device (14, 15). Spinning machine (2) according to one of the preceding claims, characterized in that the spinning unit (3) comprises a spinneret (4). Spinning machine (2) according to one of the preceding claims, characterized in that the spinning unit (3) comprises a first spinning nozzle (4) and the spinning machine (2) has at least one second spinning nozzle (22). Spinning machine (2) according to one of the preceding claims, characterized in that the at least one work station (1) has a first bobbin holder (11) for a first bobbin (10) of the first yarn (6) and the spinning machine (2) has at least a second Bobbin holder (13) for a second bobbin (12) of the second yarn (8). Spinning machine (2) according to the preceding claim, characterized in that the first bobbin holder (11) and the second bobbin holder (13) are arranged on a common arm (23) at the at least one work station (1).

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