EP3052416B1 - Yarn clearer and spinning station, equipped therewith, of a spinning machine, and method for operating a spinning station - Google Patents

Description

The present invention relates to a spinning station of a spinning machine, wherein the spinning station comprises a spin agent for producing a yarn from a fiber strand fed to the spin agent, wherein the spinning station comprises a spinning device downstream of the spin agent in a direction of transport of the yarn for winding the yarn on a spool, said Spinning a arranged between the spinning means and the winding device yarn cleaner, by means of which the yarn is monitored for yarn defects, and wherein the spinning station is associated with a controller which is adapted to interrupt the production of the yarn upon detection of defined yarn defects.

Furthermore, a yarn cleaner for a spinning station of a spinning machine is described, wherein the spinning station comprises a spin agent for producing a yarn from a fiber strand fed to the spin agent, wherein the spinning station has a spin means downstream of the spin agent in a transport direction of the yarn for winding the yarn on a spool, and wherein the spinning station is associated with a controller, which is designed to interrupt the production of the yarn upon detection of defined yarn defects.

Finally, a method for operating a spinning station of a spinning machine is the subject of the invention, wherein during normal operation, a fiber strand is supplied to a spinning means of the spinning station, wherein from the fiber strand with the aid of the spin agent, a yarn is produced, wherein the yarn produced by means of the spin agent with the aid a winding device arranged downstream of the spinning means in a direction of transport of the yarn is wound on a spool, the yarn being separated by means of a winding device between the spooling device and the spooling device Spinning and the winding device arranged Garnreinigers is monitored for yarn defects, and wherein the production of the yarn is interrupted upon detection of defined yarn defects.

Corresponding yarn cleaners are known in the art and serve to monitor the yarn produced by the respective spinning means (rotor in rotor spinning machines, air-spinning nozzle in air-spinning machines, etc.) of the spinning station. In addition to short variations in yarn thickness, variations in yarn thickness over longer yarn lengths (several meters), changes in hairiness of the yarn, or other yarn properties that may adversely affect the yarn's later processing, such as knitting or weaving it, tend to be monitored.

For semi-automatic spinning machines, the detection of yarn defects with the help of appropriate yarn cleaners and the interruption of the yarn production on detection of intolerable yarn defects automatically. Subsequently, however, the interrupted spinning process must be restarted by initiating a piecing operation by an operator. In this case, it is first of all decisive that the yarn section having the yarn fault is removed from the remaining yarn. The EP 2 078 770 A2 discloses a spinning station of a spinning machine having a signaling device that assists the operator in unwinding a faulty yarn end from the spool. This signaling device informs the operator when a sufficient amount of yarn has been unwound from the spool. Since not all previously moved components of the spinning station are to be stopped immediately when stopping the yarn production, the yarn error is usually after the interruption of the yarn production on the spool. It must first be deducted from the spool a certain yarn length, it being ensured that the withdrawn yarn also includes the previously detected yarn defect. This is quite reliably possible with short yarn defects, since in this case the operator only has to remove one to two meters of yarn. For longer yarn faults in which more than two meters of yarn must be removed, there is a great risk that the Garnfehler having yarn section by the operator is not complete is removed from the coil. During the subsequent piecing process, the yarn section containing the yarn defect, or at least part of it, is brought into contact with the fiber structure to be spun and finally arrives on the spool again without being recognized. Object of the present invention is to propose a possibility that takes into account the above problem.

The object is achieved by a spinning station, a yarn cleaner and a method having the features of the independent claims.

First, a spinning station of a spinning machine is proposed, wherein the spinning station comprises a spin agent for producing a yarn from a fiber strand supplied to the spin agent. The spin agent may, for example, be a rotor (if the spinning machine is a rotor spinning machine). Likewise, the spin agent may be formed as an air spinneret, so that it can also act at the spinning unit according to the invention to a spinning station of an air spinning machine, wherein the yarn is produced by means of a fluidized air flow. Furthermore, the spinning station comprises a winding device downstream of the spinning means in a direction of transport of the yarn, with the aid of which the yarn produced by the spin agent can be wound onto a bobbin.

Furthermore, the spinning station has a yarn cleaner arranged between the spinning means and the winding device, with the aid of which the yarn can be monitored for yarn defects. The yarn cleaner preferably comprises an optical and / or capacitive sensor which is passed by the yarn and which is designed to monitor defined parameters (eg the thickness and / or the hairiness) of the yarn during yarn production.

Finally, the spinning station is associated with a controller (which may be part of the spinning station or a central portion of the spinning machine comprising several spinning stations). The controller is designed to manufacture of the yarn when detecting defined yarn defects. A defined yarn error is, in particular, a deviation of the yarn thickness from predetermined limit values over a defined yarn length.

Now, to assist the operator in removing the correct length of yarn from the bobbin (ie, a yarn length sufficiently dimensioned to also completely remove the yarn failure causing yarn breakage), it is now proposed that the spinning station an information unit, by means of which an operator of the spinning station can be displayed, how much yarn must be unwound from the bobbin in the winding device at least to ensure that the Garnfehler having yarn section has been completely removed from the bobbin. The operator therefore not only receives the information that an interruption of the yarn production took place. Rather, the information unit also indicates to him how much yarn, d. H. which yarn length, he must unwind from the bobbin before the subsequent piecing can take place. For this purpose, the information unit is preferably permanently installed at the respective spinning station, wherein each spinning station of the spinning machine should have its own information unit.

Incidentally, the term "information unit" is understood to mean any structural unit which is suitable for displaying length data graphically or visually. For example, it would be conceivable that the information unit comprises a display on which length information (eg 2 meters) can be displayed.

In addition, the information unit should be in communication with the controller associated with the spinning station or a data processing unit of the yarn cleaner in order to obtain information regarding the yarn defect detected, in particular its length, before the interruption of yarn production.

Particular advantages arise when the information unit comprises a plurality of display elements. Furthermore, each display element should represent a defined length of yarn that must be unwound from the spool. For example, it would be conceivable that the information unit multiple light sources, for. B. in the form of LEDs (Light Emitting Diodes) comprises, each light source is labeled with a abzuzuspulenden yarn length. For example, a light source with a length of between one and five meters could be labeled, while a second light source could be labeled with a length of between five and 15 meters. For example, if the light source labeled "2m" is illuminated, the operator will know that he must unwind at least two meters of yarn from the bobbin and separate it from the remaining yarn to ensure that the yarn defect previously detected by the yarn cleaner is complete was removed and thus can not be rewound onto the bobbin during the subsequent piecing.

Furthermore, it is advantageous if the information unit comprises a, preferably separate, display element, with the aid of which the operator can be signaled that the bobbin must be removed from the winding device, since the length of the yarn section having the yarn defect exceeds a predetermined maximum length. For example, it would be conceivable that the yarn has only a small deviation of the thickness from a desired value. If, however, this deviation is detected over a longer yarn length (eg over more than 30 meters), this usually indicates a fundamental malfunction of the spinning station, in particular of the spin agent, which must be eliminated in order to produce faultless yarn again to be able to. Incidentally, the display element may also be a light source (eg, an LED), which is then activated by the controller or the data processing unit of the yarn cleaner when the bobbin needs to be completely removed, since removal of the entire yarn fault having yarn section due to the length of this section no longer makes sense.

Special advantages come with it, if the information unit is part of the yarn cleaner. Although it would also be conceivable to design the information unit as a unit detached from the yarn cleaner and to place it at a location of the spinning unit which can be viewed by the operator. However, if the information unit is part of the yarn cleaner, it may be directly (i.e., without external wiring) driven by the data processing unit of the yarn cleaner. Since this also evaluates the data of the sensor or sensors which monitor the previously selected yarn parameters (such as the yarn thickness), it is finally possible with the help of only one unit of the spinning unit, namely the yarn cleaner, to accept the yarn for yarn defects and after the detection of a yarn defect that results in the interruption of the yarn production, to notify the operator of how much yarn it must remove from the bobbin before a piecing process can take place.

The yarn cleaner according to the invention therefore has an information unit, with the help of an operator of the spinning station is visually displayed, how much yarn after the interruption of the yarn production of the coil located in the winding must be unwound at least to the Garnfehler having yarn section completely from the Remove coil. In particular, the information unit may have one or more of the features described so far or below.

Furthermore, the yarn cleaner comprises one or more optical and / or capacitive sensors with the aid of which preferably the yarn thickness and / or the hairiness of the yarn passing through can be determined (the hairiness here is a measure of the length and / or intensity of the fiber ends projecting from the yarn package) -schlingen).

Finally, the yarn cleaner should comprise a data processing unit, with the aid of which the data of the sensor (s) can be evaluated. For example, it would be conceivable that the data processing unit the The measured values determined by means of the sensors are compared with specified setpoints or limit values, and the yarn faults detected are finally subdivided into individual categories. Depending on the category, it would finally be possible for the data processing unit to individually forward its signal to the information unit. Depending on this signal, optical information is finally output to the operator via the information unit, indicating how much yarn he has to remove from the package at least before a piecing process can be initiated.

Finally, a method for operating a spinning station of a spinning machine is proposed, in which during normal operation a fiber strand is supplied to a spinning means (eg a rotor or an air-spinning nozzle) of the spinning station. A yarn is produced from the fiber structure with the aid of the spin agent and wound onto a bobbin by means of a winding device arranged downstream of the spinning means in a transport direction of the yarn. In order to monitor the quality of the yarn, a yarn cleaner is further provided, with the aid of which the yarn is monitored for yarn defects between the spinning means and the winding device. With regard to possible yarn defects or properties of the yarn cleaner in question, reference is made to the previous or following description.

Furthermore, it is provided that the production of the yarn is interrupted upon detection of defined yarn defects and that at least the yarn segment containing the yarn defect is removed, in order to ensure that the spinning station leaves only finished, spun yarn packages which have no yarn defects which negatively influence the later processing process of the yarn.

In order to now provide the operator with information as to how much yarn is to be spooled off the bobbin after a yarn-fault-based interruption of the yarn production, it is proposed according to the invention that the operator of the spinning station be notified after interrupting the yarn production with the aid of an information unit of the spinning station, How much yarn must be at least unwound from the spool located in the winding device to completely remove the Garnfehler having yarn section from the spool. The operator can therefore read a length specification, for example "9 m", at the information unit. Based on this information, he finally knows how much yarn he must at least remove from the coil.

While it is conceivable that the information unit, for example via a corresponding display, always indicates exactly the length which is to be unwound from the spool, it is also advantageous if the yarn defects detected by the yarn cleaner are respectively dependent on the length of the respective yarn defect having the yarn section of one of several categories (eg first category: yarn section length <2 m, second category: 2 m <yarn section length <9 m, third category: yarn error length having yarn section> 9 m). The abzuspulende yarn length displayed by the information unit is finally, preferably selected by the garnreinigerinternen data processing unit, depending on the respective category. For example, it would be conceivable for a display element of the information unit to be activated if the yarn section having the yarn fault has a maximum length of two meters. A second display element could light up if the yarn section having the yarn fault has a length which lies between 2 meters and 9 meters, etc. The control of the display elements of the information unit thus takes place in this case by the yarn cleaner itself, which provides the information from the categorization of recognized yarn fault uses.

Particular advantages arise when the operator is signaled by means of the information unit that the coil must be removed from the winding device as soon as the length of the yarn section having the yarn defect exceeds a predetermined maximum length. If, for example, the yarn defect extends over a yarn length of more than 10 meters, So it is usually no longer useful for reasons of high efficiency to remove this long yarn section of the coil. Rather, in this case, it is preferable to completely remove the bobbin and begin to bobbin a new bobbin.

Finally, it is advantageous if the length of the yarn section having the yarn fault is determined with the aid of a sensor of the yarn cleaner itself. The yarn cleaner thus comprises in this case a sensor with the aid of which the length of the yarn cleaner passing yarn can be determined. In this way, the yarn cleaner can detect a yarn defect and at the same time determine the length of the yarn section that has passed the yarn cleaner from the detection of the yarn defect. After evaluation of the corresponding measurement signals, the yarn error can finally activate the display element or elements in such a way that the operator knows exactly how much yarn is to be removed from the bobbin before the subsequent piecing process.

Figur 1

eine Seitenansicht einer Spinnstelle einer Rotorspinnmaschine, und

Figur 2

einen Garnreiniger (Figur 2a) sowie eine Informationseinheit desselben im Detail (Figur 2b).

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

FIG. 1

a side view of a spinning station of a rotor spinning machine, and

FIG. 2

a yarn cleaner ( FIG. 2a ) and an information unit thereof in detail ( FIG. 2b ).

FIG. 1 schematically shows a side view of a spinning station 1 of a rotor spinning machine. Rotor spinning machines are well known in the art, so that will be discussed in the following only briefly on the essential units of a corresponding spinning machine.

In principle, the spinning station 1 shown now includes a feed roller 10, with the aid of a z. B. originating from a spinning can 9 fiber strand 4 an opening roller 11 is fed, which in turn is a separation of the Fibers of the fiber composite 4 causes. The fibers are finally sucked by means of negative pressure via a feed channel 13 into the region of the spinning means 2 designed as a rotor and rotated by the spinning means 2 into a yarn 3.

The yarn 3 is withdrawn from the spinning means 2 by a take-off roller pair 12 (or other removal means) and finally, possibly after passing through a waxing 17, enters the area of a winding device 20. There it is wound onto a bobbin 16 driven about a bobbin axis 15 ,

In order to monitor the quality of the yarn 3 (i.e., certain yarn properties, such as its thickness or hairiness) during yarn manufacture at the spinning station 1, it further comprises a so-called yarn cleaner 5, which is passed by the yarn 3 during the manufacturing and winding operation.

Like for example FIG. 2a ), the yarn cleaner 5 usually comprises a measuring gap 19 to be passed by the yarn 3, in the region of which, depending on the type of yarn cleaner 5, one or more optically and / or capacitively operating sensors are arranged, corresponding to the passing yarn 3 monitor the defined parameter.

If the yarn cleaner 5 now detects an unacceptable yarn error (ie a deviation of one or more yarn parameters from one or more limit values), the yarn production is stopped by stopping the feed roller 10, the opening roller 11 and the spinning means 2. At the same time, the winding device 20 is stopped, wherein the inertia of the coil 16 usually results in that the yarn end produced by the interruption of the yarn production is completely wound onto the bobbin 16.

Before now the yarn end can be returned to the area of the spin agent 2, where it can be connected to the re-supplied fiber strand 4, the yarn fault having portion of the wound yarn 3 must be removed, this in so-called semi-automatic spinning machines at least mostly manually.

If the operator now comes to the spinning station 1, where there was a yarn interruption due to a yarn fault, he does not know at first whether it was a short or a long yarn fault. In other words, he does not know how much yarn 3 he needs to remove from the bobbin 16 to ensure that he has removed the entire yarn faulty yarn section from the bobbin 16 (this section must be removed from the remaining yarn 3 to prevent it) in that the yarn defect is rewound onto the bobbin 16 after a piecing process).

In order to give the operator now an aid in unwinding the yarn section having the yarn fault, it is proposed to equip the spinning station 1 with an information unit 7 which displays the yarn length to be abzuspulende. The information unit 7 preferably comprises one or more display elements 8, by means of which either the exact yarn length to be abzuspulende or alternatively the minimum length can be displayed, which has to be unwound in order to have certainly removed the entire yarn error of the coil 16.

As in FIG. 1 indicated, the information unit 7 may be located at a remote from the yarn cleaner 5 point, the yarn cleaner 5 and the information unit 7 may preferably be connected to a common control 6 or else directly by means of corresponding lines 14.

In a particularly advantageous embodiment of the invention, however, the information unit 7 is part of the yarn cleaner 5. A possible embodiment shows FIG. 2a ). As can be seen from this figure, the information unit 7 can be arranged in the region of the front side facing the operator and, for example, laterally of the measuring gap 19. While a display would be possible on which the exact abzuspulende yarn length could be displayed, has a in FIG. 2b ) shown information unit 7 proven. As can be seen from the above figure, the information unit 7 preferably has a plurality of display elements 8 with a corresponding length specification (see the two middle display elements 8). Illuminates now, for example, as in FIG. 2b ) indicated by the black display element 8, the display element 8, which is below the indication "2 m", the operator knows that he must unwind at least two meters of yarn 3 from the spool 16 and then separated from the remaining yarn 3 to the Completely remove yarn defects. Accordingly, one or more further display elements 8 may be present, which are labeled with a further length specification.

If the yarn section produced up to the interruption of yarn production is so long that unwinding from the reel 16 is no longer profitable, an exchange of the entire reel 16 is expedient. In order to be able to indicate this to the operator, the information unit 7 can comprise a further display element 8 (see right, indicated by a coil, display element 8 in FIG FIG. 2b )).

Likewise, the information unit 7 may comprise a display element 8, which is active (ie, for example, lit) until it comes to the detection of a Garnfehlers (see FIG. 2b ): left display element 8 with the exemplary label "OK").

Finally, the yarn cleaner 5 may comprise a reset switch 18, by means of which the yarn cleaner 5 or the controller 6 is informed by the operator can be that the Garnfehler was removed and the upcoming piecing can be performed.

The present invention is not limited to the illustrated and described embodiments. Variations within the scope of the claims are also possible as any combination of the features described, even if they are shown and described in different parts of the description or the claims or in different embodiments. For example, the described yarn cleaner can of course also be used on air-jet spinning machines or other spinning machines in which a yarn is to be monitored for yarn defects.

LIST OF REFERENCE NUMBERS

1

spinning unit

2

spin means

3

yarn

4

fiber structure

5

yarn clearer

6

control

7

information unit

8th

display element

9

spinning can

10

feed

11

opening roller

12

Off rollers

13

feed

14

management

15

coil axis

16

Kitchen sink

17

waxing

18

reset switch

19

measuring gap

20

spooling device

Claims (10)

1. Spinning station (1) of a spinning machine

   - wherein the spinning station (1) has a spinning means (2) for producing a yarn (3) from a sliver (4) fed to the spinning means (2),

   - wherein the spinning station (1) has a winding apparatus (20) for winding the yarn (3) onto a package (16), said winding apparatus (20) being arranged downstream of the spinning means (2) in a transport direction of the yarn (3),

   - wherein the spinning station (1) has a yarn clearer (5) arranged between the spinning means (2) and the winding apparatus (20), the yarn (3) being monitorable for yarn defects with the aid of said yarn clearer (5), and

   - wherein the spinning station (1) is assigned a controller (6) which is configured to interrupt the production of the yarn (3) if a defined yarn defect is detected.

   characterized in that the spinning station (1) has an information unit (7) with the aid of which it is possible to display to an operator of the spinning station (1) how much yarn (3) has to be at least unwound from the package (16) located in the winding apparatus (20) following the interruption to the yarn production in order to ensure that the yarn section having the yarn defect has been completely removed from the package (16).
2. Spinning station (1) according to the preceding claim, characterized in that the information unit (7) includes multiple display elements (8), wherein each display element (8) represents a defined length of yarn that has to be unwound from the package (16) in order to ensure that the yarn section having the yarn defect has been completely removed from the package (16).
3. Spinning station (1) according to one of the preceding claims, characterized in that the information unit (7) comprises a display element (8), with the aid of which it can be signaled to the operator that the package (16) must be removed from the winding apparatus (20), since the length of the yarn section having the yarn defect exceeds a predetermined maximum length.
4. Spinning station (1) according to one of the preceding claims, characterized in that the information unit (7) is a component of the yarn clearer (5).
5. Yarn clearer (5) for a spinning station (1) of a spinning machine,

   - wherein the spinning station (1) has a spinning means (2) for producing a yarn (3) from a sliver (4) fed to the spinning means (2),

   - wherein the spinning station (1) has a winding apparatus (20) for winding the yarn (3) onto a package (16), said winding apparatus (20) being arranged downstream of the spinning means (2) in a transport direction of the yarn (3), and

   - wherein the spinning station (1) is assigned a controller (6) which is configured to interrupt the production of the yarn (3) if a defined yarn defect is detected,

   characterized in that the yarn clearer (5) has an information unit (7), with the aid of which it is possible to display to an operator of the spinning station (1) how much yarn (3) has to be at least unwound from the package (16) located in the winding apparatus (20) following the interruption to the yarn production in order to ensure that the yarn section having the yarn defect has been completely removed from the package (16).
6. Yarn clearer (5) according to the preceding claim, characterized in that the information unit (7) has one or more of the characterizing features of claims 2 and 3.
7. Method for operating a spinning station (1) of a spinning machine,

   - wherein, during normal operation, a sliver (4) is fed to a spinning means (2) of the spinning station (1),

   - wherein a yarn (3) is produced from the sliver (4) with the aid of the spinning means (2),

   - wherein the yarn (3) produced with the aid of the spinning means (2) is wound onto a package (16) with the aid of a winding apparatus (20) arranged downstream of the spinning means (2) in a transport direction of the yarn (3),

   - wherein the yarn (3) is monitored for yarn defects with the aid of a yarn clearer (5) arranged between the spinning means (2) and the winding apparatus (20), and

   - wherein the production of the yarn (3) is interrupted if a defined yarn defect is detected,

   characterized in that , after the interruption of yarn production it is displayed to an operator of the spinning station (1) with the aid of an information unit (7) of the spinning station (1), how much yarn (3) has to be at least unwound from the package (16) located in the winding apparatus (20), in order to ensure that the yarn section having the yarn defect has been completely removed from the package (16).
8. Method according to the preceding claim, characterized in that the yarn defect detected by the yarn clearer (5) is divided into one of several categories depending on the length of the respective yarn section having the yarn defect, and that the length of yarn to be unwound displayed by the information unit (7) is selected depending on the respective category.
9. Method according to claim 7 or 8, characterized in that , with the aid of the information unit (7), it is signaled to the operator that the package (16) must be removed from the winding apparatus (20) if the length of the yarn section having the yarn defect exceeds a predetermined maximum length.
10. Method according to one of the claims 7 to 9, characterized in that the length of the yarn section having the yarn defect is determined with the aid of a sensor of the yarn clearer (5).

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