EP2774883B1 - Method for winding and cleaning a yarn - Google Patents

Description

Field of the invention

The invention relates to a method of winding a yarn from a yarn source onto a target reel in a winder, the yarn being passed between the yarn source and the target reel through a yarn cleaner for yarn quality assurance. The invention further relates to a winding machine with yarn cleaner.

background

JP H10-310330 describes a yarn cleaner in which upon detection of a defect the yarn is cut. Then the yarn end is retrieved into the splitter, the faulty spot is completely cut out, the yarn ends are spliced, and the rewinding operation is resumed.

Likewise describes EP 1 238 937 a yarn cleaning method in which, after detecting a single fault, the yarn is cut, the yarn end is retrieved, the flaw is cut out and the ends are then spliced.

EP 1 764 333 describes a yarn cleaner in which, upon detection of yarn failure, the yarn is withdrawn from a yarn store by means of rollers disposed between the yarn cleaner and the yarn store. The yarn is then cut a first time.

EP 2 377 793 describes a method and apparatus for winding yarn from a yarn source, eg from a cop, onto a target spool in the form of a cross-wound bobbin. The yarn passes through a yarn cleaner which detects defects in the composition and / or thickness of the yarn. When such a yarn defect occurs the yarn is cut behind the yarn fault. Then the yarn end with the yarn defect is sought by a specially provided for this purpose suction device behind the yarn cleaner, picked up and pulled back against the direction and shortened so far that the yarn defect is removed. Thereafter, the yarn ends thus formed can be spliced in a splicer.

Searching the yarn ends with unknown position takes considerable time and leads to a reduction in productivity.

Presentation of the invention

It is an object of the present invention to provide a method and a winder of the type mentioned, in which the cutting out of a yarn defect can be realized in a simple and economical manner.

This object is solved by the subject matter of the independent claims. Accordingly, the yarn is thus guided by the yarn source in a direction through the yarn cleaner, which is detected upon detection of a yarn defect of the yarn defect and the yarn is then spliced. In this case, however, the yarn is first withdrawn against the direction of rotation and only then cut when detecting the yarn error. By retracting the still uncut yarn, searching for the yarn end behind the yarn cleaner is unnecessary.

To retract the yarn, a tensile force is exerted on the yarn in the region between the yarn source and the yarn cleaner by means of a retraction device.

1. a) Zurückziehen des Garns soweit, dass ein erster Endbereich des Garnfehlers im Bereich einer Schneidevorrichtung zu liegen kommt;
2. b) Schneiden des Garns mit der Schneidevorrichtung zum Erzeugen eines ersten Garnendes;
3. c) Positionieren des den Garnfehler aufweisenden Garnabschnitts derart, dass ein zweiter Endbereich des Garnfehlers im Bereich der Schneidevorrichtung zu liegen kommt;
4. d) Schneiden des Garns mit der Schneidevorrichtung zum Erzeugen eines zweiten Garnendes; und
5. e) Verspleissen des ersten Garnendes und des zweiten Garnendes.

In an advantageous embodiment, the method undergoes the following steps in the detection of the yarn defect:

1. a) retraction of the yarn to the extent that a first end region of the yarn defect comes to lie in the region of a cutting device;
2. b) cutting the yarn with the cutting device to produce a first yarn end;
3. c) positioning the yarn section having the yarn fault such that a second end area of the yarn fault comes to rest in the region of the cutting device;
4. d) cutting the yarn with the cutting device to produce a second yarn end; and
5. e) Splicing the first yarn end and the second yarn end.

The order of these steps is basically arbitrary. In particular, steps a) and c) can be carried out almost simultaneously, and only after that steps b) and d).

Furthermore, the cutting according to step b) and / or d) can also be carried out during the splicing process according to step e).

The cutting according to steps b) and d) can also take place on opposite sides of the splicing device. For this purpose, the cutting device may have a first cutting station in the direction of travel in front of the splicing device and a second cutting station in the direction of travel after the splicing device.

Upon detection of the yarn failure, the yarn may be retracted counter to the direction of travel by the yarn cleaner while being measured by the yarn cleaner. In this case, the yarn error can be verified and / or its position can be determined more accurately, whereby yarn losses can be reduced.

The yarn is advantageously withdrawn so far until the whole yarn defect has run back through the yarn cleaner.

Advantageously, the yarn is retracted slower against the running direction upon detection of the yarn defect than that it is conveyed while winding in the running direction. This slower movement allows for a more accurate positioning of the yarn when cutting out the yarn defect, and if the yarn is rethreaded when retracted from the yarn cleaner, a more accurate measurement can be made, thus guaranteeing a higher yarn quality.

The invention also relates to a winder for winding a yarn from a yarn source onto a target bobbin.

The winder has a yarn cleaner for securing the yarn quality, a cutter for cutting out yarn defects, and a splicer for splicing the yarn. Further, between the yarn source and the yarn cleaner, it has a retreating device for applying a tensile force to the yarn to retract the yarn through the yarn cleaner in the direction opposite to the running direction upon detection of a yarn defect. By a "withdrawal device arranged between the yarn source and the yarn cleaner" is meant a device which grasps and pulls the yarn on its path in the area between the yarn source and the yarn cleaner.

The winder has a controller for performing the above-mentioned method.

A first pass yarn store may be provided between the yarn cleaner and the target bobbin. Such a pass yarn store is capable of buffering a certain amount of the running yarn and allows the winding operation on the target bobbin continue while the yarn is being cleaned. This increases productivity compared to conventional winding machines. Upon detection of the yarn failure with the retractor, a portion of the yarn is withdrawn from the pass yarn storage counter to the direction of travel.

In order to receive the yarn withdrawn from the retraction device in an orderly manner, the retraction device can be designed as a second yarn store, in particular as a second pass yarn store.

Brief description of the drawings

• Fig. 1 eine erste Ausführung einer Spulmaschine und
• Fig. 2 eine zweite Ausführung einer Spulmaschine.

Further embodiments, advantages and applications of the invention will become apparent from the dependent claims and from the following description with reference to FIGS. Showing:

• Fig. 1 a first embodiment of a winder and
• Fig. 2 a second embodiment of a winder.

Ways to carry out the invention Basic structure:

Fig. 1 shows a winding unit of a winder with a yarn source in the form of a cop 1 or a Kone. From this, the yarn 2 is unwound and guided to a first yarn brake 3, which imposes on the yarn 2 a desired, as constant as possible tension. The yarn then passes through a retraction device 4 to be described later, a cutting device 5 and a splicing device 6. The cutting device 5 has a first and a second cutting station 7, 8. The first cutting station 7, seen in the running direction L of the yarn 2, is arranged in front of the splicing device 6, ie it can cut the yarn in front of the splicing device 6. The second cutting station 8 is, viewed in the direction L of the yarn 2, arranged after the splicer 6, that is able to cut the yarn after the splicer.

The yarn then passes through a yarn cleaner 9, which detects geometric defects or defects in the yarn in a manner known per se. This may be e.g. to thin or thick places or to act with foreign bodies. The yarn cleaner may e.g. work optically and / or capacitively.

After the yarn cleaner 9, the yarn passes to a yarn store 10. This is a continuous yarn store, which stores a certain length, for example at least 300 meters, of the running yarn in a wound or folded state. It is designed so that the stored yarn amount is so large that the defect removal process described below can be performed without having to interrupt the winding of the target coil. Suitable yarn storage of this type are, for example in EP 2 377 793 described. The yarn storage has a collection device 10a, with which the yarn is drawn from the yarn cleaner 9 ago. For example, the yarn store is a cylinder or cone and onto which the yarn 2 is wound at the input end by means of a motor-driven rotating arm. At the exit end of the cylinder or cone, the yarn 2 is withdrawn by threading.

After the yarn store 10, the yarn 2 passes through a second yarn brake 11, to then be wound in the winding station via a roller 12 to the target coil 13. The target coil 13 is usually a cross-wound bobbin. Depending on the design of the device can be designed as a grooved drum roller 12 also eliminated.

Next has the winder according to Fig. 1 two pivotable suction pipes 14 and 15 known per se. With these, the yarn 2 can be brought, for example, in a yarn breakage of different parts of the winder to the splicer 6. The first suction tube 14 serves to capture yarn from the area of the winding machine in front of the splicing device 6 and bring it to the splicer 6, while the second suction tube 15 grips yarn from the area of the winding machine after the splicer 6 and brings it to the splicer 6.

The processes in the device are controlled by a controller 16. This control can also be implemented in several parts, e.g. in the form of a control unit for the cleaner and a control unit for the winding unit.

Retraction device:

The already mentioned retraction device 4 is able to grasp the yarn in the area between the first yarn brake 3 and the splicer 6 and to exert on this a tensile force opposite to the direction L of the yarn and pull it back out of the yarn store 10.

In the execution after Fig. 1 the retraction device 4 is equipped with a suction channel 17 which is connected to a vacuum source 18. To retract yarn, the vacuum source 18 is activated, whereupon yarn is drawn into the suction channel 17. Alternatively, the retraction device can also be formed by the suction tube 14.

In order to ensure that the yarn is drawn in only from the direction of the yarn store 10, a clamping device 19 which can be activated by the controller 16 can be seen in the running direction L in front of the retraction device 4 be provided, with which the yarn is held when the retraction device 4 is to be activated.

Business:

The operation of the apparatus and the steps for removing a yarn defect will be described below.

The first threading of the yarn (eg at game start or game change) when the target coil is empty by first the yarn from the yarn source 1 manually or with external doffer (spool case) is guided to the target coil 13 and fixed there and then the take-up of the buffer 10, the thread automatically retracts and the Garnreserve already forms before the start of the target coil 13. Then, the roller 12 is driven to rotate and the winding operation on the target spool 13 begins.

In normal operation, the yarn 2 passes through the winder in the manner described above. The yarn is unwound from Kops 1 and wound onto the target coil 13.

If the target spool 13 is full, it is replaced - manually or by means of a spool case - and the end of the yarn is applied to the new cone.

The emptying of the yarn source 1 or the cop is advantageously detected early by a special head sensor 21, and further, a thread monitor 22 may be provided after the cop 1, so that a precise stop performed and the yarn end can be stopped below the splicer 6. The yarn beginning of the new cop is then guided to the output of the splicer 6 and spliced to the "old" end.

The running through the yarn cleaner 9 yarn 2 is constantly monitored for yarn defects in normal operation. If a yarn defect is detected, the yarn, after the defect has completely passed the yarn cleaner 9, in the area between yarn source or cop 1 and Garnspeicher 10 stopped, for example by the retraction device 10a of the yarn storage 10 is stopped or even operated in the opposite direction. Since the speed of the yarn in normal operation is very high (up to, for example, 30 m / s), the defect will usually run into the yarn store 10 before the yarn comes to a complete stop.

Then, while the target bobbin continues to be wound with yarn from the yarn store 10, the retractor 4 is activated by the controller 16, and it starts pulling the yarn back through the yarn cleaner 9 in the direction of running L. In this case, the yarn is withdrawn slower against the direction L than that it is conveyed during the winding in the direction L, so that in Garnreiniger 9 a more accurate measurement can take place to determine length, position and nature of the error exactly. If a precise length measurement is to be carried out, the device may have a length measuring device in order to determine the path length of the withdrawn yarn. Or the retraction device may be configured such that the length of the retracted yarn is a known function of time and / or the control signals provided to the retraction device.

If the error thus determined is classified as such that it does not have to be removed, the retraction device 10a of the yarn store 10 is switched on again and normal operation is resumed.

If the error is classified as so serious that the defect must be removed, the yarn is pulled back so far that seen in the direction L, front (ie leading in normal operation) end of the defect reaches the cutting station 7 in front of the splicer 6 , Then, the cutting station 7 is activated and the yarn is cut in the running direction L, before the defect. The end of the yarn 2 coming from the yarn store 10 remains in the splicer 6, while the other end, which still contains the defect, for example, detected by the suction tube 14 and backwards (ie toward the target coil 13) is moved, so that a yarn area, which, seen in the direction L, is located in front of the defect in the region of the cutting station 8 after the Splicing device 6 comes to rest. Then, the cutting station 7 is activated again cut the yarn, whereby the defect can be cut out and removed, for example by means of a suitable suction device. Now the splicing device 6 splices the two yarn ends and the normal operation can be resumed.

Thanks to the yarn storage 10, the winding process can continue to run on the target spool 13 during the removal of the defect, and the productivity of the winding machine can be maintained unabated.

The winding machine shown is also able to repair yarn breaks automatically.

If a yarn break occurs between the target spool 13 and the yarn store 10, an automaton (e.g., suction arm 15, or if it is too short, another tool) will thread the yarn from the target spool 13 to the splicer 6. The yarn in the yarn store 10 will e.g. sucked from the retraction device 4 so far that its end just above the splice device 6 comes to rest. Then the yarn can be spliced. The yarn can then be rewound onto the buffer 10, whereupon the normal operation is restarted. In this case, the withdrawal device 4 is thus configured as a second yarn store, in addition to the first yarn store 10. This second yarn store can be made so large that it is able to receive all the yarn from the first yarn store 10.

Alternatively, in the event of yarn breakage between the target reel 13 and the yarn store 10, the yarn in the yarn store 10 may also be rejected, for example in the event that the retraction device 4 is not designed as a (sufficiently large) yarn store.

In a yarn breakage between the splicer 6 and the yarn storage 10, the yarn end is brought with the suction arm 15 from the yarn storage 10 back to the splicer 6 and spliced there. The rest of the yarn is sucked off.

In the event of yarn breakage between the yarn source 1 and the splicer 6, the entry of yarn into the yarn store 10 is stopped, the yarn is taken from the yarn source to the splicer 6 with the suction arm 14, and the yarn is spliced again.

Remarks:

The yarn source 1 used in the embodiments described above is a cop. However, the yarn source may be e.g. also be formed by an open-end spinning device.

In the execution after Fig. 1 the retraction device 4 is designed pneumatically. However, it is also conceivable that it is designed as a continuous yarn storage, as in Fig. 2 is pictured. In this case, the retraction device 4 is similar to the yarn storage 10 configured as a bobbin on which yarn is wound in normal operation from the lower end and unwound from the upper end. To retract yarn this is wound from the top.

In summary, it can be said that in the winding machine described, the yarn 2 is tested for defects with a yarn cleaner 9. Upon detection of a defect, the yarn 2 is first withdrawn by the yarn cleaner 9, wherein the yarn is checked again in more detail. Then the defect is cut out on the withdrawn yarn, whereupon the yarn 2 can be spliced again.

While preferred embodiments of the invention are described in the present application, it should be clearly understood that the invention is not limited to these and may be practiced otherwise within the scope of the following claims.

Claims (12)

1. Method for spooling a yarn from a yarn source (1) onto a target spool (13) in a spooling machine, wherein the yarn is guided between the yarn source (1) and the target spool (13) in a running direction (L) through a yarn cleaner (9) for ensuring yarn quality and wherein in case of detection of a yarn defect the yarn defect is cut out and thereafter the yarn is spliced, wherein in case of detection of the yarn defect the yarn is first pulled back against the running direction (L) and only after that it is cut off, characterized in that, in order to pull back the yarn in case of detection of the yarn defect, a tensile force is exerted on the yarn in an area between the yarn source (1) and the yarn cleaner (9) by means of a pull-back-device (4).
2. Method according to claim 1, wherein in case of detection of the yarn defect the method has the following steps:

   a) pulling back the yarn to such extent that a first end section of the yarn defect comes to lie in the area of a cutting device (5),

   b) cutting the yarn with the cutting device (5) for generating a first yarn end,

   c) positioning the yarn section having the yarn defect in such a way that a second end section of the yarn defect comes to lie in the area of the cutting device (5),

   d) cutting the yarn with the cutting device (5) for generating a second yarn end and

   e) splicing the first yarn end and the second yarn end.
3. Method according to claim 2, wherein the cutting according to step b) and d) is carried out on opposite sides of a splicing device of the spooling machine.
4. Method according to one of the preceding claims, wherein a first throughput yarn accumulator (10) is provided between the yarn cleaner (9) and the target spool (13), wherein yarn from the throughput yarn accumulator (10) is pulled back against the running direction (L) in case of detection of the yarn defect.
5. Method according to claim 4, wherein the throughput yarn accumulator (10) has a feed-in-device (10a) for pulling in the yarn coming from the yarn cleaner (9), wherein in case of detection of the yarn defect the feed-in-device (10a) is stopped or operated in opposite direction.
6. Method according to one of the preceding claims, wherein in case of detection of the yarn defect the yarn is pulled back against the running direction (L) through the yarn cleaner (9), wherein during this process the yarn is measured in the yarn cleaner (9) in order to verify the yarn defect and/or to determine its position.
7. Method according to one of the preceding claims, wherein the yarn is pulled back slower against the running direction (L) after detection of the yarn defect than while transporting it in running direction (L) during spooling.
8. Method according to one of the preceding claims, wherein after detection of a yarn defect the yarn is pulled back to such extent that the entire yarn defect has passed through the yarn cleaner (9).
9. Spooling machine for spooling a yarn from a yarn source (1) onto a target spool (13), wherein the spooling machine has a yarn cleaner (9) for ensuring the yarn quality, a cutting device (5) for cutting out yarn defects and a splicing device for splicing the yarn, characterized in that the spooling machine has a pull-back-device (4), between the yarn source (1) and the yarn cleaner (9), for exerting a tensile force onto the yarn in order to pull back the yarn through the yarn cleaner (9) against the running direction (L) in case of detection of the yarn defect, and in that the spooling machine has a controller for carrying out the method according to one of the preceding claims.
10. Spooling machine according to claim 9, wherein the cutting device (5) has a first cutting station (7) before the splicing device in running direction (L) and a second cutting station (8) after the splicing device in running direction (L).
11. Spooling machine according to one of the claims 9 or 10, with a first throughput yarn accumulator (10) arranged between the yarn cleaner (9) and the target spool (13), wherein in case of detection of the yarn defect a part of the yarn is pulled back out of the throughput yarn accumulator (10) against the running direction (L) by the pull-back-device (4).
12. Spooling machine according to claim 11, wherein the pull-back-device (4) is formed as a second yarn accumulator, particularly as a second throughput yarn accumulator, for receiving the yarn pulled back by the pull-back-device (4).

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