Method for extracting a thread by suction from a bobbin and a corresponding system

Abstract

A system and associated operational method are provided to extract a thread by suction from a bobbin and for re-attachment of a thread end of the thread to a new thread. The thread is extracted from the bobbin by sucking the thread in against its spooling direction on the bobbin through a suction nozzle and into an extraction port of an extraction system. A loop is subsequently formed in the thread, and the thread is separated in the area of the loop. One thread end of the separated thread is discharged into an extraction port, and the other thread end coming from the bobbin is prepared for re-attachment to a new thread. Upon being extracted by suction into the extraction system, the thread is guided through an eyelet located in a run of the thread to the extraction port and the eyelet, together with the thread, is moved out of the run of the thread to the extraction port such that the thread forms the loop between the bobbin, the eyelet, and the extraction port.

Claims

1. A method for operating a textile machine to extract a thread by suction from a bobbin and for re-attachment of a thread end of the thread to a new thread, the method comprising: extracting the thread from the bobbin by sucking the thread in against its spooling direction on the bobbin through a suction nozzle and into an extraction port of an extraction system; subsequently forming a loop in the thread; separating the thread in the area of the loop, and discharging one thread end into an extraction port; preparing the other thread end coming from the bobbin for re-attachment to a new thread; and wherein upon being extracted by suction into the extraction system, the thread is guided through an eyelet located in a run of the thread to the extraction port and the eyelet, together with the thread, is moved out of the run of the thread to the extraction port such that the thread forms the loop between the bobbin, the eyelet, and the extraction port.

2. The method according to claim 1, wherein the movement of the eyelet is produced through a swiveling movement or a displacement along a guide.

3. The method according to claim 1, wherein during the extracting of the thread by suction, the eyelet seals the suction nozzle.

4. The method according to claim 1, wherein in forming the loop, the thread is pulled over at least one edge.

5. The method according to claim 4, wherein during the extracting of the thread by suction through the eyelet, the eyelet is located on one side of the edge, and during the forming of the loop, the eyelet is located on the other side of the edge.

6. The method according to claim 1, wherein the thread is guided by the eyelet into at least one predetermined position transverse to the movement of the eyelet.

7. The method according to claim 6, wherein upon the extracting of the thread by suction, the eyelet guides the thread into a first position, and, upon forming the loop, moves the thread into a second position.

8. The method according to claim 1, wherein the thread is guided adjacent to the eyelet through a multi-way valve for forming the loop upon the extracting of the thread or upon the re-attachment of the thread.

9. The method according to claim 1, wherein Immediately after separation of the thread, the thread end coming from the bobbin is clamped between delivery rollers.

10. The method according to claim 1, wherein upon the extracting of the thread by suction from the bobbin and upon delivery of the thread to the bobbin, the thread is guided through the suction nozzle.

11. A system in a textile machine for extracting a thread by suction from a bobbin and for re-attaching a thread end a new thread, comprising: a suction nozzle configured to pick up the thread from the bobbin; an extraction port of an extraction system, the extraction port in communication with the suction nozzle to extract the thread by suction through the suction nozzle counter to a spooling direction of the thread on the bobbin; a device that forms a loop in the thread extracted from the bobbin; a thread separating device disposed at a location to separate the thread in the area of the loop to create the thread end for subsequent re-attachment; a thread preparation device that prepares the thread end for re-attachment; and wherein the device that forms the loop further comprises an eyelet arranged in a run of the thread to the extraction port, wherein the thread is guided through the eyelet upon being extraction by suction; the eyelet arranged on a movable holder; and wherein the eyelet, together with the thread, is movable out of the run of the thread to the extraction port such that the thread forms a loop between the bobbin, the eyelet, and the extraction port.

12. The system according to claim 11, wherein the holder with the eyelet is mounted to be swiveled or displaced.

13. The system according to claim 12, wherein holder is slidably guided.

14. The system according to claim 11, wherein the eyelet is movable to a position to seal an opening in the suction nozzle during the extracting of the thread by suction.

15. The system according to claim 11, further comprising an edge disposed so that the thread runs over the edge during formation of the loop.

16. The system according to claim 15, wherein during the extracting of the thread by suction through the eyelet, the eyelet is located on one side of the edge, and during the forming of the loop, the eyelet is located on the other side of the edge.

17. The system according to claim 11, wherein the eyelet comprises one or more guides disposed to contact and guide the thread into at least one predetermined position transverse to movement of the eyelet.

18. The system according to claim 11, wherein one of the guides is arranged on an inner side of the eyelet, and another of the other guides is arranged on an outer side of the eyelet.

19. The system according to claim 11, further comprising a multi-way valve in communication with the extraction port is arranged adjacent to the eyelet for forming the loop upon extraction of the thread by suction.

20. The system according to claim 11, wherein the multi-way valve comprises a first tube that is rotatable within a second tube to place the multi-way valve into different operating positions.

21. The system according to claim 20, wherein the outer tube comprises at least one suction port.

22. The system according to claim 21, wherein the suction port is disposed to pick up the thread from the bobbin upon the extraction of the thread by suction.

23. The system according to claim 20, wherein the multi-way valve comprises a slot through which the thread runs upon delivery of the thread to the bobbin.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantages of the invention are described in the following embodiments. The following is shown:

(2) FIG. 1a depicts the delivery of a thread from a spinning position to a bobbin;

(3) FIG. 1b depicts an eyelet swung into the suction nozzle;

(4) FIG. 1c depicts a thread threaded into the eyelet;

(5) FIG. 1d depicts the formation of a loop;

(6) FIG. 1e depicts the loop in front of the spinning position;

(7) FIG. 1f depicts the separation of the loop;

(8) FIG. 1g depicts the re-attachment of the thread;

(9) FIG. 2 depicts an eyelet with thread guides;

(10) FIG. 3 depicts a thread guide;

(11) FIG. 4a depicts the delivery of a thread from a spinning position to a bobbin;

(12) FIG. 4b depicts an eyelet swung into the suction nozzle;

(13) FIG. 4c depicts a thread threaded into the eyelet;

(14) FIG. 4d depicts the formation of a loop;

(15) FIG. 4e depicts the loop in front of the spinning position;

(16) FIG. 4f depicts the separation of the loop;

(17) FIG. 4g depicts the re-attachment of the thread;

(18) FIG. 5a depicts a multi-valve in spinning position;

(19) FIG. 5b depicts the multi-valve in a thread extraction position;

(20) FIG. 5c depicts the multi-valve in a position to form a loop upon re-attachment;

(21) FIG. 5d depicts the multi-valve in a position to form a thread loop in the normal run of the thread; and

(22) FIG. 6 depicts an eyelet introduced into the suction nozzle.

DETAILED DESCRIPTION

(23) Reference will now be made to embodiments of the invention, one or more examples of which are shown in the drawings. Each embodiment is provided by way of explanation of the invention, and not as a limitation of the invention. For example features illustrated or described as part of one embodiment can be combined with another embodiment to yield still another embodiment. It is intended that the present invention include these and other modifications and variations to the embodiments described herein.

(24) FIG. 1a shows a run of the thread of a thread 1 from a spinning position 2 to a bobbin 3. The bobbin 3 is driven by means a winding roller 4 in the direction of the arrow. In the spinning position 2, a thread is produced; this is subsequently wound onto the bobbin 3. Instead of the spinning position 2, the described device can also be used in winding machines with which the thread of a ring spinning bobbin is unwound and is wound crosswise onto the bobbin 3.

(25) From FIG. 1a, it can be seen that the thread 1 enters and passes through an opening 5 of a suction nozzle 6. Thus, in normal delivery operation, the thread 1 is located at least in a partial area of the suction nozzle 6. This facilitates, for example, upon a thread breakage with which the thread end is wound onto the bobbin 3, the rapid finding of the thread end and the re-attachment to a new thread. The thread 1 is pulled out from the spinning position 2 by means of delivery rollers 7 and is wound up by the bobbin 3.

(26) A swivel-mounted holder 10 is arranged outside of the run of the thread 1. An eyelet 11 and a seal 12 are located on the holder 10. In a later step of the method, the eyelet 11 is used to form a thread loop. In normal spinning or delivery operation, the eyelet 11 is inoperable. An extraction port 8 may be switched on, but in the normal case is switched off to save energy.

(27) FIG. 1b shows the position of the holder 10 upon a thread breakage. A thread end is located on the surface of the bobbin 3. In the suction nozzle 6, negative pressure is applied by means of the extraction port 8, in order to find the thread end on the bobbin 3. In the suction nozzle 6, the eyelet 11 is swung in by means of the holder 10. The opening 5 is sealed by means of the seal 12. Thus, the suction nozzle 6 forms a closed suction channel.

(28) FIG. 1c shows the finding of a thread end 13 of the thread 1. Herein the thread 1 is threaded through the eyelet 11. The bobbin 3 rotates counter to the spooling direction of FIG. 1a. Thus, the thread 1 is unwound from the bobbin 3, and is guided into the extraction port 8 following the suction nozzle 6.

(29) In accordance with FIG. 1d, the holder 10 once again moves, together with the eyelet 11, out of the suction nozzle 6. Thereby, the thread 1 forms a loop 14 between the bobbin 3 and the extraction port 8. In this case, the thread 1 is pulled through the edges 15 of the opening 5. Thus, it already forms a first defined shape of the loop 14. The thread end 13 continues to be pulled in by the extraction port 8. Thus, between the bobbin 3, the eyelet 11 and the extraction port 8, the thread 1 is stretched taut.

(30) Through a further movement of the holder 10 in the direction of the spinning position 2, the loop 14 is stretched in a manner corresponding to FIG. 1e. In order to prevent the thread segment going to the bobbin 3 and the thread segment running into the extraction port 8 from contacting each other, a spacer 16 is provided. The spacer 16 separates the two thread segments and keeps them spaced apart from each other. The spacer 16 also brings about the fact that the thread 1 does not come into contact with components of the machine and thereby does not disrupt the further treatment of the thread.

(31) FIG. 1f shows the separation of the thread 1. A separating device 17, such as a knife or scissors, cuts the thread 1. The thread end 13 is subsequently sucked into the extraction port 8 and disposed of. The newly created thread end 13 now features a defined length and may be fed, for example, to a thread preparation device (not shown), in order to feature an optimal structure of the thread end 13 for the re-attachment to a new thread. The thread preparation may take place at such point in time or even later.

(32) In accordance with FIG. 1g, the thread end 13 is then inserted into the spinning position 2 and is used for the re-attachment of the thread. This occurs by the fact, for example, that negative pressure prevails in the spinning position and sucks in the thread end 13 falling out of the eyelet 11. The thread end 13 is then finally extracted by suction. The holder 10 may thereafter be swiveled back to the original position in accordance with FIG. 1a.

(33) The thread 1 delivered to the bobbin 3 is held in a predetermined position by means of the spacer 16 and is once again fed to the bobbin 3 through the opening 5. The pulling off of the thread 1 from the spinning position 2 in turn takes place by means of the delivery rollers 7, between which the thread 1 is then once again clamped. The clamping of the thread 1 between the delivery rollers 7 may take place at this point, or as early as the point in time of FIGS. 1e and 1f.

(34) In FIG. 2, the eyelet 11 with the seal 12 is shown in greater detail. The eyelet 11 extends along the seal 12. In the swung-in state, the eyelet 11 is located completely inside the suction nozzle 6 in accordance with FIGS. 1b and 1 c. The thread, which may come to lie at any point in the axial direction of the bobbin 3, is sucked through the longitudinally extending eyelet 11. When swiveling the eyelet 11 by means of the holder 10 (FIGS. 1c, 1d and 1e), the thread 1 is moved along inclined guides 20 initially in the direction of a groove 21. The thread 1 is herein trapped in the groove 21. Thereafter, through the swiveling movement of the eyelet 11, the thread 1 is formed into a loop 14, whereas the one part of the thread 1 comes to lie in the groove 21 and the other part of the thread comes to lie in a groove 22 outside of the eyelet 11. Thus, in the internally arranged groove 21, the guide is located for the defective thread; that is, for the thread end 13 that is extracted by suction later in the extraction port 8. The good thread, that is, the thread end 13 that is used for re-attachment and is later wound onto the bobbin 3, lies in the externally arranged groove 22. In order to be able to securely catch the good thread, which is wound onto the bobbin 3, in the groove 22, a guide 23 is provided; this directs the thread coming from the groove 21 into the groove 22.

(35) FIG. 3 shows a spacer 16. The spacer 16 features a groove 24 for guiding the defective thread, which is to be discharged into the extraction port 8. For guiding the other side of the thread loop 14, a guide 25 is provided on the spacer 16. Through this guide 25, on the one hand, the separation between the good thread and the defective thread is brought about and, on the other hand, the guide 25 serves as a sliding surface for the good thread, in order to be able to arrive in the normal run of the thread no later than after re-attachment. Such spacers 16 adjusted to the place of use in a form corresponding to the requirements may be arranged repeatedly in the run of the thread, and, depending on the need, may bring about at various places that the loop 14 remains stretched.

(36) FIG. 4a shows an additional version of the present invention. Comparable components are provided with the same reference signs as in FIGS. 1a to 1g. In this embodiment, a multi-valve 30 is arranged in the area of the suction nozzle 6. The thread 1 proceeds through a slot 31 of the multi-way valve 30 into the suction nozzle 6, and from there is wound by means of the winding roller 4 onto the bobbin 3. The holder 10 with the eyelet 11 is swiveled out of the run of the thread. In this embodiment, the eyelet 11 is designed differently than in the previous embodiment. In the cross-section transverse to the thread running direction, it is formed in a ring shape, and in a side view in a wedge shape.

(37) A gap in which the eyelet 11 is later inserted is located between the extraction port 8 and the suction tube 6. The multi-valve 30 comprises two tubes 32 and 33 that are fitted into one another, are rotatable and feature slots. The inner tube 33 is solely a tube section, as is explained in more detail in FIG. 5. Thus, the slot extends over a large part of the circumference of the tube 33. The outer tube 32 of the multi-way valve 30 features a suction port 34, which leads to the extraction port 8. In FIG. 4a, the position of the tube 33 is such that the suction port 34 is blocked. Thus, the extraction port 8 is inactive.

(38) FIG. 4b shows the situation when the thread breaks. The thread is wound onto the bobbin 3. The holder 10 is swiveled upwards and, with the ring-shaped seal 12, closes the gap between the suction nozzle 6 and the multi-valve 30. The extraction port 8 is still closed by the tube section 33. The eyelet 11 follows the suction nozzle 6 and the multi-valve 30.

(39) For finding the thread end 13 on the bobbin 3, in accordance with FIG. 4c, the bobbin 3 rotates counter to the normal delivery direction. The inner tube 33 is now rotated in such a manner that the slot 31 is closed and, on the other hand, the suction port 34 is open. The extraction port 8 is thereby activated, and the thread end 13 is sucked in through the multi-valve 30 into the extraction port 8.

(40) After the thread end 13 has been found, the holder 10 moves back down, and thereby opens the gap between the suction nozzle 6 and the multi-valve 30. In addition, the inner tube 33 is rotated again, such that the slot 31 is opened, but the suction port 34 remains open and the extraction port 8 remains active. It forms a thread loop 14, which passes through the slot 31 of the multi-valve 30 and thus already has a certain position. The thread loop 14 is stretched by the extraction port 8, which attempts to extract the thread end 13 by suction. The bobbin 3 may still move against the normal delivery direction and thus track the thread 1. However, it is also possible that, upon the formation of the loop 14, thread 1 from the extraction port 8 is pulled back.

(41) In FIG. 4e, the holder 10 is located with the eyelet 11 in the area of the spinning position 2. The thread loop 14 is stretched and then proceeds completely through the slot 31. Spacers 16, as described in FIG. 3, may likewise be arranged here in order to keep the thread loop 14 open. However, they are not shown here.

(42) In FIG. 4f, the thread loop 14 is severed by means of the separating device 17. The thread end 13 is sucked into the extraction port 8. The new thread end 13 is available for thread preparation.

(43) In FIG. 4g, the thread end 13 is sucked into the spinning position 2, and the production of the thread 1 can begin again. The holder 10 may eventually be swiveled back into the original position in accordance with FIG. 4a. The inner tube 33 may thereupon once again close the suction port 34, such that energy is saved, because, at such moment, the extraction port 8 is not required.

(44) FIG. 5a shows a section through the multi-valve 30. It can be seen from this that the multi-valve 30 features an outer tube 32 and an inner tube 33. The inner tube 33 is only a tube section, which is rotatably mounted with respect to the tube 32. The suction port 34 is arranged at the outer tube 32; this leads into the extraction port 8. In addition, an additional suction port 36 is provided in the outer tube 32. The suction port 36 may serve the purpose of picking up a thread loop upon spinning, in order to be able to carry out any required length compensation. In this case a thread loop is more or less sucked into the suction port 36 and sucked out from it when needed.

(45) In FIG. 5a, the inner tube 33 is shown in a position in which both suction ports 34 and 36 are closed. Only the slot 31 of the tube 32 is open. Through this slot 31, with normal delivery, the thread runs from the spinning position 2 to the bobbin 3. This position corresponds to FIGS. 4a and 4b.

(46) In FIG. 5b, compared to FIG. 5a, the tube 33 is rotated. In this position, the suction port 34 is opened, while the suction port 36 and the slot 31 are closed. This position is occupied for seeking out the thread end on the bobbin 3, and the extraction by suction of the thread end 13 into the extraction port 8 (see FIG. 4c).

(47) In FIG. 5c, the tube 33 is in turn somewhat rotated. This position closes the suction port 36, but opens the suction port 34 and the slot 31. In this position of the tube 33, the loop 14 is formed (FIGS. 4d to 4g).

(48) FIG. 5d shows a closed suction port 34. The slot 31 and the suction port 36 are open. In this position, a thread loop is formed in the suction port 36; this can be used for length compensation upon winding on the thread 1 onto the bobbin 3.

(49) FIG. 6 shows the movement of the eyelet 11 along a guide 40. Thus, a circular swiveling movement of the eyelet 11 is not required, by which installation space can be saved. Thus, the movement of the eyelet 11 may be guided nearly arbitrarily in accordance with the available installation space at the work location. Some of the different positions of the eyelet 11 are shown hatched with the reference signs 11, 11 and 11. Here, the holder 10 is integrated with the seal 12. However, this represents only a schematic representation of the version.

(50) Together with the holder 10 and the seal 12, the movement of the eyelet 11 may take place, for example, by means of a Bowden cable (not shown), which pushes or pulls the eyelet 1, the holder 10 and the seal 12 along the guide 40. A shutter may also be connected to the eyelet; this is formed, for example, as a bellows or as a type of toggle chain. This shutter may be moved together with the eyelet 11, and may cover the work area if the eyelet 11 is located in the area of the suction nozzle 6. In the end position, the shutter may once again free the work area. In the position of the eyelet 11, such a shutter is indicated in an almost folded up state.

(51) This invention is not limited to the illustrated and described embodiments. Variations within the scope of the claims, just as the combination of characteristics, are possible, even if they are illustrated and described in different embodiments.

LIST OF REFERENCE SIGNS

(52) 1 Thread 2 Spinning position 3 Bobbin 4 Winding roller 5 Opening 6 Suction nozzle 7 Delivery rollers 8 Extraction port 10 Holder 11 Eyelet 12 Seal 13 Thread end 14 Loop 15 Edge 16 Spacer 17 Separating device 20 Guide 21 Groove 22 Groove 23 Guide 24 Groove 25 Guide 30 Multi-valve 31 Slot 32 Outer tube 33 Inner tube 34 Suction port 36 Suction port 40 Guide 41 Shutter