Changing element for a spinning machine, and spinning machine equipped with said changing element

Abstract

A traversing element is provided for a spinning machine that produces a roving. The traversing element includes a guide segment disposed to guide the roving onto a surface of a tube or a roving bobbin, and a support segment. The guide segment is configured at an end of the support segment and an opposite end of the support segment is connectable to a support of the spinning machine. A closed cavity is provided in the traversing element, the closed cavity partially filled with a liquid. Heat that occurs in the guide segment due to friction between the guide segment and the roving when the traversing element is operating is absorbed by the liquid.

Claims

1. A traversing element for a spinning machine that produces a roving, the traversing element comprising: a guide segment disposed to guide the roving onto a surface of a tube or a roving bobbin; a support segment, the guide segment configured at an end of the support segment and an opposite end of the support segment connectable to a support of the spinning machine, the support segment comprising an elongated support arm; a closed cavity provided in the traversing element, the closed cavity partially filled with a liquid, wherein heat that occurs in the guide segment due to friction between the guide segment and the roving when the traversing element is operating is absorbed by the liquid; wherein the cavity is defined at least in part in an interior of the support arm; and wherein the cavity is closed off by a guide element, the guide segment configured on the guide element.

2. A traversing element for a spinning machine that produces a roving, the traversing element comprising: a guide segment disposed to guide the roving onto a surface of a tube or a roving bobbin; a support segment, the guide segment configured at an end of the support segment and an opposite end of the support segment connectable to a support of the spinning machine, the support segment comprising an elongated support arm; a closed cavity provided in the traversing element, the closed cavity partially filled with a liquid, wherein heat that occurs in the guide segment due to friction between the guide segment and the roving when the traversing element is operating is absorbed by the liquid; wherein the cavity is defined at least in part in an interior of the support arm; and wherein at least a portion of the cavity is enclosed by a pipe wall of a heat pipe, at least part of the heat pipe arranged in the interior of the support arm.

3. The traversing element according to claim 2, wherein the heat pipe is in direct heat-conducting contact with the guide element.

4. The traversing element according to claim 2, wherein the support arm comprises an end-face opening through which the heat pipe extends to outside of the support arm.

5. The traversing element according to claim 2, wherein the heat pipe is detachably connected to the support arm.

6. The traversing element according to claim 1, further comprising a cooling element connected to the guide segment in a heat conducting manner.

7. The traversing element according to claim 2, further comprising a cooling element connected to the guide segment in a heat conducting manner, the cooling element at least partially surrounding the heat pipe.

8. The traversing element according to claim 7, wherein the cooling element is directly connected to the heat pipe.

9. The traversing element according to claim 7, wherein the cooling element is fastened to the support arm.

10. A spinning machine, comprising: a spinning nozzle that produces a roving from a fiber bundle supplied to the spinning nozzle; a winding device that winds the roving produced by the spinning nozzle; the winding device further comprising a movably mounted traversing element that guides the roving in a traversing manner while the roving is wound onto a tube during operation of the spinning machine; the traversing element further comprising: a guide segment disposed to guide the roving onto a surface of a tube or a roving bobbin; a support segment, the guide segment configured at an end of the support segment and an opposite end of the support segment connectable to a support of the spinning machine; and a closed cavity defined in the traversing element, the closed cavity partially filled with a liquid, wherein heat that occurs in the guide segment due to friction between the guide segment and the roving when the traversing element is operating is absorbed by the liquid.

11. The spinning machine according to claim 10, wherein the traversing element further comprises a cooling element connected to the guide segment in a heat conducting manner, and the winding device further comprising at least one tube holder that is set into rotational movement about a rotation axis by a drive, and wherein a distance between the cooling element and the rotation axis is a maximum of 40 cm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantages of the invention are described in the following exemplary embodiments, in which:

(2) FIG. 1 is a side view of an air-jet spinning machine;

(3) FIG. 2 is a top view of an inventive traversing element;

(4) FIG. 3 is a side view of an inventive traversing element;

(5) FIG. 4 is a partial cross-section of a top view of the traversing element shown in FIG. 3; and,

(6) FIG. 5 is a detail of the depiction shown in FIG. 4.

DETAILED DESCRIPTION

(7) 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.

(8) 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.

(9) 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.

(10) 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.

(11) 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.

(12) 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).

(13) 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.

(14) 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.

(15) 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.

(16) 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.

(17) 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.

(18) 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.

(19) 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.

(20) 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 (opposite) 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.

(21) 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.

(22) As may be seen from the aforesaid figures, it is advantageous if the 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).

(23) 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.

(24) Moreover, it may be seen from FIG. 4 that the cooling element 18 preferably comprises a plurality of the 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.

(25) 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.

(26) 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.

(27) 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

(28) 1 Traversing element 2 Guide segment 3 Roving 4 Tube 5 Roving bobbin 6 Support segment 7 Support member 8 Cavity 9 Liquid 10 Support arm 11 Guide element 12 Pipe wall 13 Heat pipe 14 Opening 15 Spinning nozzle 16 Fiber bundle 17 Winding device 18 Cooling element 19 Cooling rib 20 Drive 21 Tube holder 22 Rotation axis of the tube holder 23 Pair of draw-off rollers 24 Drafting roller 25 Drafting system 26 Spinning machine 27 Gripper 28 Gear wheel 29 Gripper support 30 Thermally conductive paste 31 Cooling ribs support 32 Traversing device D Minimum distance between the cooling element and the rotation axis of the tube holder T Transport direction