Abstract
The present invention relates to a method for handling a yarn end (10) of a cross-wound bobbin (2) at a winding station (1) of a textile machine producing a cross-wound bobbin, whereas the cross-wound bobbin can be held and driven in a bobbin holder (3), a thread (6) is laid in a cross-wise manner on the cross-wound bobbin by means of a traverse device (5) and a suction nozzle (7; 12) is subjected to negative pressure and the thread end is sucked into the suction nozzle through a suction mouth (8; 13). In accordance with the invention, it is proposed that the suction mouth is moved relative to the suction nozzle, such that the distance between the suction mouth and the cross-wound bobbin is changed, in order to be able to find the thread end and/or to be stretched between the suction mouth and the cross-wound bobbin and that the stretched thread is moved to a unit (9) of the textile machine for further processing. Furthermore, the invention relates to a winding station of a textile machine producing cross-wound bobbins (2) with a bobbin holder (3), a traversing device (5) and a suction nozzle (7; 12) that can be subjected to negative pressure with a suction mouth (8; 13) arranged in a movable manner on the suction nozzle, in order to be able to find the thread end (10) and/or to stretch it between the suction mouth and the cross-wound bobbin, and with a thread handling element (8; 13; 16; 18), in order to be able to move the stretched thread (6) to a unit (9) of the textile machine for further processing.
Claims
1. Method for handling a yarn end (10) of a cross-wound bobbin (2) at a winding station (1) of a textile machine producing a cross-wound bobbin (2), whereas the cross-wound bobbin (2) can be held and driven in a bobbin holder (3), a thread (6) is laid in a cross-wise manner on the cross-wound bobbin (2) by means of a traverse device (5) and a suction nozzle (7; 12) is subjected to negative pressure and the thread end (10) is sucked into the suction nozzle (7; 12) through a suction mouth (8; 13), characterized in that, the suction mouth (8; 13) is moved relative to the suction nozzle (7; 12), such that the distance between the suction mouth (8; 13) and the cross-wound bobbin (2) is changed, in order to be able to find the thread end (10) and/or to be stretched between the suction mouth (8; 13) and the cross-wound bobbin (2) and that the stretched thread (6) is moved to a unit (9) of the textile machine for further processing.
2-17. (canceled)
Description
[0030] Further advantages of the invention are described in the following embodiments. The following is shown:
[0031] FIG. 1a a schematic side view of a winding station of a textile machine producing cross-wound bobbins,
[0032] FIG. 1b an additional schematic side view of the winding station from FIG. 1a,
[0033] FIG. 1c an additional schematic side view of the winding station from FIGS. 1a and 1b,
[0034] FIG. 2a a schematic side view of an additional winding station of a textile machine producing cross-wound bobbins,
[0035] FIG. 2b an additional schematic side view of the winding station from FIG. 2a,
[0036] FIG. 2c an additional schematic side view of the winding station from FIGS. 2a and 2b,
[0037] FIG. 3a a schematic side view of an additional winding station of a textile machine producing cross-wound bobbins,
[0038] FIG. 3b an additional schematic side view of the winding station from FIG. 3a,
[0039] FIG. 3c an additional schematic side view of the winding station from FIGS. 3a and 3b, and
[0040] FIG. 3d an additional schematic side view of the winding station from FIGS. 3a, 3b and 3c.
[0041] FIG. 1a shows a schematic side view of a winding station 1 of a textile machine producing cross-wound bobbins. Thereby, the textile machine may be a winding or a spinning machine, for example a rotor or air spinning machine. A cross-wound bobbin 2 is held in a bobbin holder 3 and is driven by a drive roller 4. However, within the scope of the invention, it would also be possible to drive the coil 2 directly over a sleeve of the coil 2 clamped in the bobbin holder 3. Thereby, a traversing device 5 lays a thread 6 in a crosswise manner on the cross-wound bobbin 2. Thereby, the thread 6 comes either from a delivery coil or from a spinning unit (both not shown here). An essentially stationary suction nozzle 7 with suction mouth 8 is not used in this illustration, and is located in a parking position. Likewise, a unit 9 of the textile machine shown here (for example, a splice device), which can connect two thread ends to each other, or a setting device, which can set a thread end to a thread that is newly produced or is to be newly produced, is not used.
[0042] The suction nozzle 7 and the unit 9 are only used if the normal winding or spinning operation has been interrupted, for example by a thread breakage (thus, a tearing of the thread 6), or a clearer cut (thus, a deliberate cutting out of a faulty section of the thread 6). In such cases, the thread end winds on the cross-wound bobbin 2, since, due to its inertia, the cross-wound bobbin 2 cannot be decelerated fast enough. In such a case, the wound thread end is searched for, found and then further processed.
[0043] The searching for and finding of the thread end 10 is illustrated in FIG. 1b. For searching for the thread end 10, the suction mouth 8 is rotated around the suction nozzle 7 until the suction mouth 8 is located just above the surface 11 of the cross-wound bobbin 2. Subsequently, the suction nozzle 7 is subjected to negative pressure, and the cross-wound bobbin 2 is slowly rotated counter to the direction of rotation in winding operation. This is carried out until the thread end 10 is located on the surface 11 of the cross-wound bobbin 2 and is sucked into the suction nozzle 7 through the suction mouth 8.
[0044] The next step is shown in FIG. 1c. After the suction nozzle 7 has sucked in the thread end 10, the suction mouth 8 is in turn rotated around the suction nozzle 7. The suction mouth 8 is thereby rotated until it has moved the thread 6 to the unit 9. At that point, the unit 9 accepts the thread end 10 and continues to process it, for example, by connecting the thread end 10 with an additional thread end or by setting the thread end 10 to thread that is newly produced or is to be newly produced. The suction mouth 8 is then moved back into the parking position, the thread 6 is again threaded into the traversing device 5, and the spinning or winding operation is continued.
[0045] In the following description of the alternative embodiment shown in FIG. 2a, the same reference signs are used for characteristics that are identical and/or at least comparable in their designs and/or modes of action in comparison to the first embodiment shown in FIGS. 1a, 1b and 1c. To the extent that such are not described once again in detail, their designs and/or modes of action correspond to the designs and modes of action of the characteristics described above.
[0046] In the embodiment shown in FIG. 2a, in comparison with the embodiment illustrated in FIGS. 1a, 1b and 1c, a suction nozzle 12 with a linearly displaceable suction mouth 13 is provided. Thereby, the suction mouth 13 is arranged at one end of a suction spout 14, which can be displaced in a linear manner with respect to the stationary base body 15 of the suction nozzle 12. Here, the suction nozzle 12 is located in a parking position, as is a pneumatic thread catcher 16.
[0047] The search for a thread end 10 on the surface 11 of the cross-wound bobbin 2 is shown in FIG. 2b. For this purpose, the suction spout 14 is displaced in the direction of the cross-wound bobbin 2, until the suction mouth 13 is located just above the surface 11 of the cross-wound bobbin 2. Subsequently, the suction nozzle 12 is subjected to negative pressure, and the cross-wound bobbin 2 is rotated counter to the direction of rotation in winding operation, until the thread end 10 is sucked into the suction spout 14 through the suction mouth 13.
[0048] The additional method is shown in FIG. 2c. In order to further process the thread 6, the suction spout 14, together with the suction mouth 13, is displaced away from the cross-wound bobbin 2, such that the thread 6 is stretched between the cross-wound bobbin 2 and the suction mouth 13. A catching nozzle 17 of the pneumatic thread catcher 16 is now moved into the vicinity of the stretched thread 6. The catching nozzle 17 is subjected to negative pressure, such that the stretched thread 6 is sucked in by the catching nozzle 17. The thread 6 thus captured by the pneumatic thread catcher 16 is then moved with the assistance of the catching nozzle 17 for further processing to a unit (not shown here), for example a splice device or a spinning device. The suction mouth 13 and the catching nozzle 17 are then moved back into the parking position, the thread 6 is once again threaded into the traversing device 5, and the spinning or winding operation is continued.
[0049] In the following description of the alternative embodiment shown in FIG. 3a, the same reference signs are used for characteristics that are identical and/or at least comparable in their designs and/or modes of action in comparison to the first or second embodiment, as the case may be, shown in FIGS. 1a, 1b and 1c along with 2a, 2b and 2c. To the extent that such are not described once again in detail, their designs and/or modes of action correspond to the designs and modes of action of the characteristics described above.
[0050] With the embodiment shown in FIG. 3a, the bobbin holder 3 is rotatably mounted around an axis A, such that the position of the cross-wound bobbin 2 can be changed. In this illustration, the suction nozzle 7 is shown in a parking position.
[0051] FIG. 3b shows the winding station 1 after a thread breakage or a clearer cut. The suction mouth 8 is rotated around the suction nozzle 7 and is subjected to negative pressure. At the same time, the cross-wound bobbin 2 is rotated counter to the direction of rotation upon winding operation, until the thread end 10 is sucked into the suction nozzle 7 through the suction mouth 8.
[0052] At that point, as shown in FIG. 3c, the thread 6 is stretched. For this purpose, the suction mouth 8 is rotated around the suction nozzle 7 in such a manner that it moves away from the cross-wound bobbin 2. At the same time, the bobbin holder 3, and thus the cross-wound bobbin 2, are rotated around the axis A, such that the cross-wound bobbin 2 moves away from the suction nozzle 7. The thread 6 is thus stretched between the cross-wound bobbin 2 and the suction mouth 8. A mechanical thread catcher 18 is then pivoted, whereas a catching hook 19, which is arranged at one end of the mechanical thread catcher 18, captures the thread 6.
[0053] As shown in FIG. 3d, the catching hook 19 pulls the thread 6 such that the thread 6 forms a loop. Thereby, the thread end 10 remains in the suction nozzle 7. The thread length required for the loop is either unwound from the cross-wound bobbin 2, in particular if the cross-wound bobbin is lifted off as shown here, or is pulled off the suction nozzle 7, in particular if the cross-wound bobbin is laid on the drive roller 4, as in the previously shown embodiments. In the latter case, of course, the required thread length can also be advanced into the loop by means of a targeted rewinding. The loop that is thus formed in the thread 6 is then pulled to a unit not shown here for further processing. After further processing, the suction mouth 8 is rotated back into the parking position, the thread 6 is once again threaded into the traversing device 5, and the spinning or winding operation is continued.
[0054] 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
[0055] 1 Winding station [0056] 2 Cross-wound bobbin [0057] 3 Bobbin holder [0058] 4 Drive roller [0059] 5 Traversing device [0060] 6 Thread [0061] 7 Suction nozzle [0062] 8 Suction mouth [0063] 9 Unit [0064] 10 Thread end [0065] 11 Surface [0066] 12 Suction nozzle [0067] 13 Suction mouth [0068] 14 Suction nozzle [0069] 15 Base body [0070] 16 Pneumatic thread catcher [0071] 17 Catching nozzle [0072] 18 Mechanical thread catcher [0073] 19 Catching hook [0074] Axis
