Changing Element for a Spinning Machine, and Spinning Machine Equipped with said Changing Element

Abstract

The present invention relates to a traversing element (1) for a spinning machine (26), wherein the traversing element (1) comprises a guide segment (2) by means of which a roving (3) may be guided in the region of a surface of a tube (4) or of a roving bobbin (5), and wherein the traversing element (1) comprises a support segment (6) via which it may be connected to a support member (7) of the spinning machine (26). According to the invention it is suggested that the traversing element (1) comprises at least one cavity (8) that is closed with respect to the outside and is partially filled with a liquid (9), wherein heat that occurs in the region of the guide segment (2) due to friction between the guide segment (2) and the roving (3) guided by the guide segment (2) when the traversing element (1) is operating may be absorbed by the liquid (9). In addition, a spinning machine (26) having a corresponding traversing element (2) is proposed.

Claims

1. A traversing element for a spinning machine (26) that serves for producing roving, wherein the traversing element (1) comprises a guide segment (2) by means of which the roving (3) may be guided in the region of a surface of a tube (4) or of a roving bobbin (5), and wherein the traversing element (1) comprises a support segment (6) via which it may be connected to a support (7) of the spinning machine (26), characterized in that the traversing element (1) has at least one cavity (8) that is closed with respect to the outside and is partially filled with a liquid (9), wherein heat that occurs in the region of the guide segment (2) due to friction between the guide segment (2) and the roving (3) guided by the guide segment (2) when the traversing element (1) is operating may be absorbed by the liquid (9).

2-14. (canceled)

Description

[0031] FIG. 1 is a schematic view of a detail of a spinning machine 26 according to the invention that serves for producing a roving 3.

[0032] The depicted spinning machine 26 is embodied as an air-jet spinning machine and preferably comprises a drafting system 25 that has a plurality of corresponding drafting rollers 24 and that is supplied with a fiber bundle 16, for instance in the form of a doubled drafter sliver (for reasons of clarity, only one of the six illustrated drafting rollers 24 is provided with a reference number). In principle, the depicted air-jet spinning machine 26 furthermore comprises a spinning nozzle 15 spaced apart from the drafting system 25 and having an inner vortex chamber, which is known from the prior art and therefore not shown, and in which the fiber bundle 16 or at least a portion of the fibers of the fiber bundle 16 may be provided with a twist by means of a swirled air flow.

[0033] Likewise, the spinning machine 26 includes a draw-off unit in the form of a pair of draw-off rollers 23 and a winding device 17 for the roving 3 downstream of the draw-off unit. The winding device 17 comprises a tube holder 21 for fixing a tube 4 and a drive 20 by means of which the tube holder 21 and thus also the correspondingly fixed tube 4 is rotatable about a rotation axis 22 in order to wind roving 3 supplied by the spinning nozzle 15 onto the tube 4.

[0034] Furthermore, the winding device 17 comprises a traversing device 32 having a traversing element 1 that may be moved back and forth in the direction of the double arrow illustrated in FIG. 1 by means of a drive (not shown). During the winding process, the traversing element 1 guides the roving 3 in a traversing manner and to this end has a guide element 11 via which it is in contact with the roving 3.

[0035] The spinning machine 26 works according to a special air spinning method. For forming the roving 3, the fiber bundle 16 is guided in a transport direction T via an infeed opening into the vortex chamber (not shown and in the interior) of the air spinning nozzle 15. There it receives a twist, i.e. at least a portion of the fibers of the fiber bundle 16 is gripped by an air flow that is generated by appropriately placed air nozzles. A portion of the fibers is thereby pulled at least a little way out of the fiber bundle 16 and is wound around the tip of a yarn forming element which protrudes into the vortex chamber (not shown).

[0036] Finally, the fibers of the fiber bundle 16 are drawn out of the vortex chamber via an inlet opening of the yarn forming element and a draw-off channel which is arranged inside the yarn forming element and adjoins the inlet opening. In doing so, the free fiber ends are finally also drawn on a helical trajectory in the direction of the inlet opening and wrap as wrapping fibers around the centrally running core fibers, resulting in a roving 3 which has the desired twist.

[0037] Due to the only partial twisting of the fibers, the roving 3 has a (residual) draftability which is essential for the further processing of the roving in a downstream spinning machine 26, for example a ring spinning machine.

[0038] FIG. 2 now shows a top view of a traversing element 1 according to the invention. The traversing element 1 comprises a guide element 11 having a guide segment 2, wherein the guide segment 2 is in contact with the roving 3 and guides it. At the beginning of the winding process, the guide element 11 rests against the surface of the tube 4 and after a certain winding period it rests against the outermost roving layer of the roving bobbin 5 created by winding.

[0039] The traversing element 1 furthermore comprises a support segment 6 that is preferably in the form of the shown elongated support arm 10 and to which the guide element 11 is fastened. As illustrated in FIGS. 3 through 5, the support segment 6 serves for fastening to a support member 7 of the spinning machine 26, which support member, in turn, is movable via a drive (not shown) as shown with the transverse movement indicated by the double arrow in FIG. 1.

[0040] Moreover, FIG. 2 illustrates that in principle it is advantageous if the roving 3 is in contact with the traversing element 1 not just in the region of the guide segment 2. Instead, as a rule it is desired that the roving 3 wraps around the support segment 6 one or multiple times. The roving is decelerated by the frictional forces that occur so that it may finally be wound onto the tube 4 with a certain tensile stress.

[0041] While the roving 3 is now guided by the traversing element 1, the regions of the traversing element 1 that are in contact with the roving 3, i.e., primarily the guide element 11 and the support segment 6 wrapped by the roving 3, heat up due to friction.

[0042] According to the invention it is therefore provided that the traversing element 1 comprises, preferably in its interior, a cavity 8 that is partially filled with a liquid 9. As described in greater detail in the following and as illustrated in particular in FIG. 4, the cavity 8 extends from the guide element 11 into the region of a cooling body. As already described in the general description (which is explicitly referenced at this point), the liquid 9 evaporates due to the heating of the guide element 11 and the segment of the support arm 10 wrapped by roving 3. In doing so, the evaporated liquid 9 extracts heat from the aforesaid regions of the traversing element 1 and cools them in return.

[0043] In order to be able to give off the heat energy absorbed by the liquid to the ambient air at another location, the cavity 8 is surrounded by a cooling element 18, preferably in an end region of the traversing element 1 facing away from the guide segment 2. The cooling element 18, which preferably has a plurality of cooling ribs 19, extracts heat from the evaporated liquid 9 and thus causes the vapor from the liquid to condense. The condensed liquid 9 finally travels back into the region of the guide element 11 and to the region of the support arm 10 wrapped by the roving 3 and there, in turn, cools the aforesaid segments.

[0044] FIGS. 3 (side view), 4 (partial cross-sectional top view), and 5 (detail of the view in accordance with FIG. 4) show another embodiment of the traversing element 1 according to the invention.

[0045] As may be seen from the aforesaid figures, it is advantageous if the aforesaid cavity 8 in which the liquid 9 is disposed is formed by a separate heat pipe 13 that is closed on all sides and that for instance may be detachably inserted into the support arm 10 via the opening 14 shown in FIG. 5 (in FIG. 4, no visual distinction is made between the liquid 9 and the vapor that results from the liquid absorbing heat; naturally, when the spinning machine 26 is operating, some of the liquid 9 is present as vapor that condenses again in the region of the cooling element 18).

[0046] The pipe wall 12 of the heat pipe 13 may rest from the inside either directly against the guide element 11 and/or against the support arm 10. A heat transfer paste 30 that promotes the desired heat transfer is preferably arranged at least in certain sections between the pipe wall 12 and the adjacent segments of the traversing element 1.

[0047] Moreover, it may be seen from FIG. 4 that the cooling element 18 preferably comprises a plurality of the aforesaid cooling ribs 19, which, in turn, are connected to a common cooling ribs support 31. The latter may finally be connected directly to the heat pipe 13 or also to the support arm 10.

[0048] Finally, FIGS. 2 through 5 illustrate that the traversing element 1 may have a preferably hook-shaped gripper 27, via the position of which the number of windings of the roving 3 about the support segment 6 can be influenced. To this end, the gripper 27 is preferably mounted via a gripper support 29 that is mounted on the support segment 6 and may be twisted relative thereto. In addition, the gripper support 29 may be connected to or surrounded by a gear wheel 28, which, in turn, may be set into rotation via a corresponding driving gear wheel or a driving gear rack (not shown) in order to change the number of wrappings and thus the braking force acting on the roving 3. Naturally, the gripper support 29 and the gear wheel 28 are not necessarily required; see also FIG. 2.

[0049] Finally, with respect to FIG. 2 it should be noted that the cooling element 18 should be disposed in the vicinity of the tube 4. If the smallest distance D, shown in FIG. 2, between the rotation axis 22 of the tube holder 21 and the cooling element 18 is located in the region mentioned in the above description, the air flow generated when the tube 4 is rotated actively cools the cooling element 18 and thus causes particularly efficient condensation of the incoming liquid 9 evaporated in this region in the interior of the traversing element 1.

[0050] The present invention is not limited to the exemplary embodiments that have been shown and described. Modifications within the scope of the patent claims are also possible, as is any combination of the described features, even if they are shown and described in different parts of the description or the claims or in different exemplary embodiments.

REFERENCE LIST

[0051] 1 Traversing element [0052] 2 Guide segment [0053] 3 Roving [0054] 4 Tube [0055] 5 Roving bobbin [0056] 6 Support segment [0057] 7 Support member [0058] 8 Cavity [0059] 9 Liquid [0060] 10 Support arm [0061] 11 Guide element [0062] 12 Pipe wall [0063] 13 Heat pipe [0064] 14 Opening [0065] 15 Spinning nozzle [0066] 16 Fiber bundle [0067] 17 Winding device [0068] 18 Cooling element [0069] 19 Cooling rib [0070] 20 Drive [0071] 21 Tube holder [0072] 22 Rotation axis of the tube holder [0073] 23 Pair of draw-off rollers [0074] 24 Drafting roller [0075] 25 Drafting system [0076] 26 Spinning machine [0077] 27 Gripper [0078] 28 Gear wheel [0079] 29 Gripper support [0080] 30 Thermally conductive paste [0081] 31 Cooling ribs support [0082] 32 Traversing device [0083] D Minimum distance between the cooling element and the rotation axis of the tube holder [0084] T Transport direction