EP3112507B1 - Spinning station of a spinning machine, spinning machine and method for operating a spinning station - Google Patents

Description

The present invention relates to a method for operating a spinning station of a spinning machine, wherein a spinning unit of the spinning station, a fiber material is supplied, wherein from the spinning unit supplied fiber material using the spinning unit, a yarn is generated, wherein the yarn leaves the spinning unit via an outlet and with The yarn is monitored by means of a winding device and taking into account predetermined winding parameters on a sleeve, and wherein upon detection of a defined deviation of a monitored Garnparameters of at least one desired value, in the context of a sleeve replacement on the winding device and / or during a shutdown of the spinning station a, a normal operation of the spinning station interrupting, stop sequence is initiated during which the spinning unit and the winding device are stopped, wherein the spinning unit un d the winding device are stopped in the context of the stop sequence such that the yarn section last produced does not run completely onto the sleeve located in the winding device.

Furthermore, a spinning station of a spinning machine for producing a yarn is described, wherein the spinning station has at least one spinning unit with an inlet for a fiber material and an outlet for the yarn made of the fiber material, and wherein the spinning station, a winding device for winding the yarn produced and a Yarn monitoring unit for monitoring at least one yarn parameter of the yarn leaving the spinning unit.

Generic spinning machines can, for example, as air spinning machines be formed, which serve to produce a yarn of a strand-shaped fiber material (eg., A sliver) using a vortex air flow generated by air nozzles within a vortex chamber. Corresponding air spinning machines are in the EP 2 573 237 A2 , the EP 2 918 534 A1 (Interim literature) and the EP 0 906 974 A1 described. For this purpose, a strand-shaped fiber material is conveyed in the direction of the spinneret by means of a delivery device, which is preferably formed by a pair of delivery rollers upstream of the spinneret in the spinirection of a drafting system, and is sucked in or sucked in by this under vacuum. The fiber material finally reaches the interior of the spinneret and there into the region of the inlet mouth of a spindle-shaped Garnbildelements. The outer fibers of the strand-like fiber material are wound around the internal fibers in the region of the inlet orifice with the aid of the vortex air flow generated by the air nozzles, so that, as a result, a stable yarn is formed, which is finally removed by means of an extraction device arranged outside the spinneret via the outlet channel from the vortex chamber withdrawn and wound by means of winding device on a sleeve.

Likewise, however, the spinning machine according to the invention can also be designed as a so-called rotor spinning machine sufficiently described in the prior art, whose principle is that the fibers of a likewise strand-shaped fiber material by means of a resolving device (usually in the form of an opening roller) isolated and the rapidly rotating rotor of the spinning unit to be supplied. Due to the rotor speed, the individual fibers abut the inner wall of the rotor and are twisted into one another. The twisted fibers can finally be drawn off via an outlet of the spinning unit and wound onto a sleeve of a downstream winding device. An open-end spinning machine is for example in the US 4,163,358 A described.

If spinning defects occur during the spinning process (intolerable thick or thin spots of the yarn, yarn breakage, unsatisfactory supply of the fiber material, etc.) or if one or more spinning stations are shut off for a certain period of time, yarn production is the result of the respective yarn production interrupting event, a piecing process necessary. In this case, the end of the yarn already produced (ie the end section of the last yarn section wound prior to the interruption of the yarn production) is turned into or through the outlet of the spinning unit, contrary to the actual spinning direction and possibly after one or more intermediate steps (eg a yarn end preparation) these returned. Subsequently, the yarn end is brought into contact with the fiber material supplied to the spinning unit or the correspondingly supplied individual fibers and withdrawn from the spinning unit in the spinning direction. In this case, the normal spinning operation, ie normal operation, is resumed, in which a yarn is produced from the fiber material fed to the spinning unit.

Regardless of the type of spinning machine used, it is therefore necessary, after an interruption of the yarn production, to unwind a piece of the yarn previously wound on the reel from the reel, in order to be able to guide it against the spinning direction into or through the spinning unit. This is usually realized in that the coil is driven backwards and / or the yarn with a corresponding handling device, such as a service robot is unwound from the spool (at this point it should be noted that in the context of the invention under the term "sleeve "the body on which the yarn is wound, while the" spool "is the combination of said sleeve and the yarn on the sleeve, is understood. Object of the present invention is to facilitate the unwinding of the yarn in the context of said piecing process.

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

The inventive method relates to the operation of a spinning station of a spinning machine (preferably an air or rotor spinning machine), wherein the spinning unit of the spinning station fed to a fiber material and a yarn is produced. Depending on the type of spinning machine used, the spinning unit comprises, for example, a vortex chamber or a rotor. Furthermore, the spinning station generally comprises further elements necessary for yarn production, such as a yarn feed (eg a drafting device in the case of an air spinning machine or the above-mentioned opening roller in the case of a rotor spinning machine), a take-off device (for example in the form of a take-off roller pair), with the help of which the yarn is withdrawn from the spinning unit.

After leaving the outlet of the spinning unit, the yarn is monitored with the aid of a yarn monitoring unit for at least one yarn parameter (thickness, hairiness or other characteristics characterizing the quality of a yarn or its temporal variations) and finally using a winding device and taking into account predetermined (eg. Spool parameters stored in a control unit are wound onto a sleeve. In principle, the winding parameters are all variables which influence the position and the tension of the yarn on the bobbin. These include, for example, the speed of the sleeve, the laying angle of the yarn on the bobbin surface, according to the invention, the tension with which the yarn is wound, the traversing speed or the traversing width of a yarn during the winding along a predetermined path back and forth traversing element.

Finally, it is provided that upon detection of a defined deviation of a monitored yarn parameter from at least one desired value, in the context of a sleeve change on the winding device (ie, the replacement of a wound at least partially yarn with sleeve by an empty sleeve) and / or in the context of a shutdown of the spinning station a, a normal operation of the spinning station interrupting, stop sequence is initiated while the spinning unit (and any additional elements involved in yarn production, such as the drafting device mentioned above, the opening roller or the take-off device) and also the winding device are stopped.

The method is characterized in that the spinning unit and the winding device are stopped in the stop sequence in such a way that the yarn section last produced (i.e., the yarn end) does not run completely onto the sleeve located in the winding device. Thus, after the spinning unit stops, the yarn end is either inside the same or between the spinning unit and the winding device. In either case, there is a bobbin-side yarn end that is not on the bobbin surface and thus can be quickly retrieved by a corresponding yarn handling device of the spinning station or a service robot patrolling back and forth along the individual spinning stations.

As a result, after stopping said components of the spinning station, there is a yarn end which is easy to grasp, so that the time for performing the piecing operation can be shortened compared with the case in which the yarn end runs onto the spool and before the subsequent one partial unwinding of the yarn first on the bobbin surface, for example by means of a suction device, must be sought.

In order to improve now also in the context of the subsequent piecing process unwinding of the last wound on the sleeve yarn section (which is necessary to lead the yarn end against the spinning direction in or through the spinning unit), the invention also provides that after initiation of the abovementioned stop sequence, one or more winding parameters are changed at least temporarily relative to the winding parameter (s) correspondingly prevailing during normal operation.

While it was common in the art to keep the individual winding parameters constant until the spinning unit and winding apparatus stopped, i. E. In the context of the invention, it is now proposed to adapt one or more winding parameters during the stop sequence in such a way that the yarn wound onto the sleeve during the stop sequence can be unwound particularly easily again during the subsequent piecing operation. In particular, the change of the one or more winding parameters should therefore take place in such a way that the last wound up yarn section is lighter, ie. H. with less effort, unwind from the bobbin.

Furthermore, it is extremely advantageous in this context if one or more winding parameters are changed abruptly or stepwise after initiation of the stop sequence. By way of example, it would be conceivable for the winding parameter (s) to be changed within less than one second from a value prevailing during normal operation to a value intended for the stop phase. It would also be conceivable that the winding parameter (s) should be gradually, d. H. within a period of more than a second, to make sudden changes in direction or speed. Also, the winding parameter (s) may deviate during the entire stop phase from the parameters prevailing during normal operation or only during a limited time window of the stop sequence.

Particular advantages arise when between the initiation of the stop sequence and the stop of the winding device at least 1 m (meters), preferably at least 2 m, and at most 30 m, preferably at most 25 m, yarn are wound onto the sleeve. If the length of the correspondingly wound up yarn is of the stated order of magnitude, it is ensured that the last yarn section wound on the bobbin with a modified or changed winding parameter (s) has a length which corresponds at least to the length during the piecing process must be unwound from the coil again. Alternatively or additionally, it is also advantageous if between the initiation of the stop sequence and the stop of the winding device at most 10 seconds (seconds), preferably at most 5 seconds pass.

Furthermore, it is provided that the tension of the yarn ("yarn tension") wound on the sleeve during the stop sequence is reduced at least temporarily compared with that yarn tension with which the yarn was wound onto the sleeve during the normal operation preceding the stop sequence. The yarn section wound onto the bobbin during the stop sequence is looser on the bobbin in this case than the yarn section wound up during normal operation. As a result, the last wound up yarn section (= yarn end) can also be unwound more easily from the bobbin during the piecing process. The yarn tension during the stop sequence should be at least temporarily at least 5%, preferably at least 10%, particularly preferably at least 20%, smaller than during normal operation of the spinning station. For example, it would be conceivable to decouple the yarn from the traversing element during the stop sequence in order to reduce the tension.

It is also advantageous if the traversing speed, with which the yarn is moved back and forth on the sleeve during winding, during the stop sequence and depending on the speed of the coil at least temporarily reduced or increased compared to that traversing speed, with the yarn immediately before was moved to initiate the stop sequence. As a result, the distances between two adjacent yarn sections on the bobbin surface can be increased, so that the subsequent unwinding of the yarn reduces the risk that the yarn sections mentioned adhere to one another and make the unwinding difficult. At the same time as the change in the traversing speed, the rotational speed of the spool and / or the traversing width should finally be reached (ie, the distance between the two inflection points of the traversing element) are changed to prevent tearing of the yarn.

It is advantageous if the traversing frequency with which the yarn is moved back and forth during winding onto the sleeve is reduced or increased during the stop sequence at least temporarily relative to that traversing frequency with which the yarn moves back and forth immediately before the initiation of the stop sequence has been. As a result, with appropriate adaptation of the reel speed and / or the traversing width, the distance between adjacent yarn sections on the yarn surface can be increased and the subsequent unwinding can be simplified.

With regard to the traversing speed and the traversing frequency it should be noted that these, preferably with simultaneous adjustment of the rotational speed of the coil can also be adjusted so that the distance between adjacent yarn sections compared to the normal operation is reduced and the yarn in the form of several parallel turns on the Coil is wound up.

It is likewise advantageous if the traversing width over which the yarn is moved back and forth on the sleeve during winding is reduced, at least temporarily, with respect to the traversing width over which the yarn was moved back and forth immediately prior to the initiation of the stop sequence , For example, during the stop sequence, the yarn could be spooled onto a portion of the bobbin surface whose width (ie, its spatial extent parallel to the axis of rotation of the sleeve) is less than 50%, preferably less than 30%, of the width to which the yarn is attached was rewound during normal operation. The area of the bobbin surface on which the yarn is wound during the stop sequence with reduced traversing width can be in the region of one of the two end faces of the bobbin or else in the center (relative to the bobbin width).

Furthermore, it is advantageous if the sleeve is driven during the stop sequence with a rotational speed which is at least temporarily less than the rotational speed with which the sleeve was driven during the normal operation preceding the stop sequence. For example, the speed could be reduced continuously or even gradually to zero. Further, at the same time to reduce the speed of the traversing width, traversing speed or the traversing frequency can be changed to keep the yarn tension within defined limits.

It is particularly advantageous if, during the stop sequence, the sleeve is at least temporarily disconnected from a sleeve drive driving it during normal operation, or said sleeve drive is deactivated at least temporarily during the stop sequence. This also reduces the speed of the coil accordingly.

In particular, it is advantageous in this context if the winding device has a braking device, wherein the rotational speed of the sleeve is actively reduced during the stop sequence with the aid of the braking device. The braking device may for example have a friction element which is fixed to a carrier and can be brought into contact with a corresponding mating surface of the sleeve when a braking of the coil is desired. Likewise, the braking device can decelerate the coil to a different extent during the stop sequence. For example, it would be possible to reduce the speed of the coil slowly to zero at the beginning and abruptly towards the end of the stop sequence.

Finally, a spinning station of a spinning machine for producing a yarn is proposed, wherein the spinning station has at least one spinning unit with an inlet for a fiber material and an outlet for the yarn made of the fiber material, and wherein the spinning station, a winding device for winding the yarn produced and a yarn monitoring unit for monitoring at least one yarn parameter of the Having spinning unit leaving yarn. According to the invention, the spinning station finally has a control unit or is in operative connection with such, wherein the control unit is designed to operate the spinning station according to previous or subsequent description. In particular, the control unit can be designed to operate the respectively described components of the spinning machine according to one or more arbitrarily combined process features within the scope of the claims.

Likewise, the spinning machine may have the device features described so far or below, which may also be realized individually or in any combination, within the scope of the claims.

Figur 1

ausgewählte Komponenten einer Spinnstelle einer erfindungsgemäßen Spinnmaschine,

Figur 2

den Ausschnitt gemäß Figur 1 nach Abschluss einer Stoppsequenz und vor der Durchführung eines Anspinnvorgangs,

Figur 3

eine Draufsicht auf eine Spule während des Normalbetriebs der die Spule umfassenden Spinnstelle,

Figur 4

eine Draufsicht auf eine Spule während einer Stoppsequenz der die Spule umfassenden Spinnstelle, und

Figur 5

eine Draufsicht auf eine Spule während einer alternativen Stoppsequenz der die Spule umfassenden Spinnstelle.

Further advantages of the invention are described in the following exemplary embodiments. It show, each schematically:

FIG. 1

selected components of a spinning station of a spinning machine according to the invention,

FIG. 2

the clipping according to FIG. 1 upon completion of a stop sequence and before performing a piecing operation,

FIG. 3

a top view of a coil during normal operation of the spinning station comprising the coil,

FIG. 4

a plan view of a coil during a stop sequence of the coil comprising the spinning station, and

FIG. 5

a plan view of a coil during an alternative stop sequence of the spinning station comprising the coil.

FIG. 1 shows a section of a spinning station designed as an air-spinning machine according to the invention spinning machine. The spinning station comprises a drafting system 13 with a plurality of drafting rollers 14, with the aid of a Fiber material 2 is conveyed in the form of one or more fiber strands in the direction of an inlet 10 of a likewise formed as part of the spinning unit spinning unit 1 and thereby refined.

The spinning unit 1 comprises, among other things, a basically known from the prior art internal vortex chamber in which the fibers of the fiber material 2 are rotated by means of a vortex air flow to a yarn 4, which finally with the aid of a take-off device 12 (preferably in the form of a pair of draw-off roller) an outlet 9 is withdrawn from the spinning unit 1 and wound by means of a winding device 5 onto a sleeve 6, which is set into a rotary movement by means of a sleeve drive 7.

Furthermore, an only indicated control unit 8 is provided, which is designed to operate the individual components according to corresponding specifications, in particular according to the previous or subsequent description.

If the spinning station is a spinning station of a rotor spinning machine, a dissolving device is generally present instead of the drafting system 13 with the aid of which the supplied fiber material 2 is dissolved into its individual fibers. Furthermore, instead of a spinning unit 1 having a swirl chamber, the spinning station comprises a spinning unit 1 with a rapidly rotating rotor, which ultimately serves to form the yarn 4 from the individual fibers.

Is now at the spinning unit according to the invention an interruption of yarn production, because a yarn quality monitoring yarn monitoring unit 3 reports an excessive deviation of the yarn quality of a target value or because a pod change is pending or the spinning unit to be shut down (for example, for maintenance purposes), so the yarn production to be interrupted.

While it was customary in the prior art to end the normal operation of the spinning station such that the resulting yarn end 17 (see FIG. 2 ) is completely wound on the surface of the spool 15, the invention provides, inter alia, to perform the stop sequence such that the yarn end 17 after stopping the spinning unit 1, the take-off device 12 and located in the winding device 5 coil 15 within the Spinning unit 1 or between the outlet 9 and the coil 15 is located (as in FIG. 2 shown).

Finally, following the stop sequence, a piecing operation takes place during which the end portion of the yarn 4 previously wound on the spool 15 (i.e., the yarn end 17) is unwound from the spool 15 again. On the one hand, this makes it possible to separate the yarn section last produced by the spinning unit 1 from the remaining yarn 4 (if this did not meet the quality specifications). On the other hand, said unwinding is necessary in order to guide the yarn end 17 (or the newly formed yarn end 17 after removal of a certain yarn section) after the interruption of the yarn production in the subsequent piecing operation against the spinning direction into or through the spinning unit 1.

In order to facilitate the unwinding of the required amount of yarn in the piecing process, it is now proposed according to the invention to change one or more winding parameters during the stop sequence with respect to the winding parameters selected during normal operation of the spinning station.

FIG. 3 shows a coil 15 during normal operation, in which the running yarn 4 by means of a parallel to the axis of rotation of the coil 15 reciprocating traversing element 16 is guided.

On the other hand shows FIG. 4 a coil 15 after completion of an inventively carried out stop sequence of the spinning station. As can be seen from this figure, the traversing speed of the traversing element 16 increased during the construction of the last yarn layer to increase the mutual spacing of adjacent yarn sections and thus facilitate the subsequent unwinding of said yarn layer. Alternatively or simultaneously, the speed of the coil 15 can be reduced, for example, by activating a purely in FIG. 4 schematically indicated braking device 11.

Another example, the yarn 4 to wind during the execution of the stop sequence on the already existing coil 15 shows FIG. 5 , In contrast to the normal operation of the spinning station, in which the yarn 4 is varied over the entire width of the package, the yarn 4 was wound during the stop sequence only over a reduced traversing width B on the bobbin surface. While in FIG. 5 only one yarn layer is shown with reduced width, several yarn layers with reduced width can be wound onto the spool 15 in the course of the stop sequence.

The present invention is not limited to the illustrated and described embodiments. Variations within the scope of the claims are possible.

LIST OF REFERENCE NUMBERS

1

spinning unit

2

fiber material

3

Garnüberwachungseinheit

4

yarn

5

spooling device

6

shell

7

sleeve driving

8th

control unit

9

Outlet of the spinning unit

10

Inlet of the spinning unit

11

braking means

12

off device

13

drafting system

14

Drafting system roller

15

Kitchen sink

16

Traversing element

17

yarn

B

Traversing width

Claims (11)

1. A method for operating a spinning position of a spinning machine,

   - a fiber material (2) being fed into a spinning unit (1) of the spinning position,

   - a yarn (4) being produced by means of the spinning unit (1) from the fiber material (2) fed into the spinning unit (1),

   - the yarn (4) exiting the spinning unit (1) via an outlet (9) and being monitored with respect to at least one yarn parameter by means of a yarn monitoring device (3),

   - the yarn (4) being wound onto a sleeve (6) by means of a winding device (5) according to prescribed winding parameters, and

   - a stop sequence for interrupting the normal operating mode of the spinning position being initiated when a defined deviation of a monitored yarn parameter from at least one specified value is detected in the course of a sleeve change-out at the winding device (5) and/or in the course of shutting down the spinning position, during which the spinning unit (1) and the winding device (5) are stopped,

   - the spinning unit (1) and the winding device (5) are stopped in the course of the stop sequence, such that the last yarn segment produced does not run fully onto the sleeve (6) present in the winding device (5),

   characterized in that,
   one or more winding parameters being changed at least temporarily after the stop sequence is initiated in order to facilitate unwinding the last yarn segment wound onto the sleeve (6) prior to the stop of the winding device (5) in the course of a piecing process subsequent to the stop sequence Wherein the tension of the yarn (4) wound onto the sleeve (6) during the stop sequence is at least temporarily reduced relative to the tension at which the yarn (4) had been wound onto the sleeve (6) during normal operation preceding the stop sequence.
2. The method according to the preceding claim, characterized in that one or more winding parameters are changed abruptly or gradually after initiating the stop sequence.
3. The method according to any one of the preceding claims, characterized in that at least 1 m, preferably at least 2 m, and no greater than 30 m, preferably no greater than 25 m of yarn is wound onto the sleeve (6) between initiating the stop sequence and the stop of the winding device (5), and/or that no more than 10 s, preferably no more than 5 s pass between initiating the stop sequence and the stop of the winding device (5).
4. The method according to any one of the preceding claims, characterized in that the traversing speed at which the yarn (4) is displaced back and forth while being wound onto the sleeve (6) is at least temporarily reduced or increased during the stop sequence relative to the traversing speed at which the yarn (4) had been displaced back and forth immediately prior to initiating the stop sequence.
5. The method according to any one of the preceding claims, characterized in that the traversing frequency at which the yarn (4) is displaced back and forth while winding onto the sleeve (6) is at least temporarily reduced or increased during the stop sequence relative to the traversing frequency at which the yarn (4) had been displaced back and forth immediately prior to initiating the stop sequence.
6. The method according to any one of the preceding claims, characterized in that the traversing width (B) over which the yarn (4) is displaced back and forth while wound onto the sleeve (6) is at least temporarily reduced during the stop sequence relative to the traversing width (B) over which the yarn (4) had been displaced back and forth immediately prior to initiating the stop sequence.
7. The method according to any one of the preceding claims, characterized in that the sleeve (6) is driven at a rotary speed during the stop sequence at least temporarily lower than the rotary speed at which the sleeve (6) had been driven during normal operation immediately preceding the stop sequence.
8. The method according to any one of the preceding claims, characterized in that the sleeve (6) is at least temporarily separated from a sleeve drive (7) driving the same during normal operation, or if said sleeve drive (7) is at least temporarily deactivated during the stop sequence.
9. The method according to any one of the preceding claims, characterized in that the winding device (5) comprises a braking device (11), wherein the rotary speed of the sleeve (6) is actively reduced by means of the braking device (11) during the stop sequence.
10. A spinning position of a spinning machine for producing a yarn (4),

    - the spinning position comprising at least one spinning unit (1) having an inlet (10) for a fiber material (2) and an outlet (9) for the yarn (4) produced from the fiber material (2), and

    - the spinning position comprising a winding device (5) for winding the produced yarn (4) and a yarn monitoring device (3) for monitoring at least one yarn parameter of the yarn (4) exiting the spinning unit (1),

    characterized in that,
    the spinning position comprises a controller (8) designed for operating the spinning position according to any one or more of the preceding claims.
11. Spinning machine having a spinning position for producing a yarn (4),

    - the spinning machine comprising a controller,

    - the spinning position having a spinning unit (1) having an inlet (10) for a fiber material (2) and an outlet (9) for the yarn (4) produced from the fiber material (2), and

    - the spinning position comprising a winding device (5) for winding the produced yarn (4) and a yarn monitoring device (3) for monitoring at least one yarn parameter of the yarn (4) exiting the spinning unit (1), characterized in that, the spinning position is operationally connected to a controller (8) designed for operating the spinning position according to any one or more of the preceding method claims 1 to 9.

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