Abstract
The invention relates to a ring traveler (10) for ring spinning or ring twisting machines having a metallic core, wherein the metallic core is at least partially coated with an anti-friction coating consisting of at least a base polymer and a solid lubricant, whereby the anti-friction coating has a layer thickness of 0.1 m to 50 m and the base polymer is from the group of polyamides, polyimides, polyamide/imides.
Claims
1. A ring traveler (10) for ring spinning machines or ring twisting machines, having a metallic core, characterized in that the metallic core is coated at least partially with an anti-friction coating consisting of at least a base polymer and a solid lubricant, whereby the anti-friction coating has a layer thickness of 0.1 m to 50 m and the base polymer is from the group of polyamides, polyimides, polyimide/imides.
2-8. (canceled)
Description
[0014] The invention is explained in greater detail below on the basis of the drawings, in which:
[0015] FIG. 1 shows a schematic diagram of a ring spinning machine,
[0016] FIG. 2 shows a schematic diagram of a spinning ring with a ring traveler,
[0017] FIG. 3 shows an enlarged diagram according to FIG. 2.
[0018] FIG. 1 shows a schematic diagram of a spinning position of a ring spinning machine, such that today's ring spinning machines have up to 2,000 such spinning positions. A fiber strand, a so-called sliver 1, is sent to a drawing unit 2 in the ring spinning machine. The sliver 1 is drawn by the drawing unit 2 to form a thread 3. The drawing unit 2 shown here is a so-called belt drawing unit, which is generally used for cotton. Depending on the application, a variety of designs for drawing units 2 are known from the prior art. The thread 3 is guided to a ring traveler 10 via a thread guide 4 downstream from the drawing unit 2. After passing through the ring traveler 10, the thread 3 is wound onto the yarn bobbin 5. The yarn bobbin 5 is set in rotation 6 by a drive 7. The ring traveler 10 is entrained by the thread 3 due to this rotation 6, which results in a twist being imparted to the thread 3, which thus forms the yarn. Due to the fact that the ring traveler 10 is held on the spinning ring 8, the ring traveler 10 is forced to travel around the yarn bobbin 5. The spinning ring 8 is held in a stationary amount on a ring frame 9.
[0019] When a full yarn bobbin 5 is replaced, the thread 3 remains looped through the ring traveler 10. The process begins again when a new yarn bobbin 5 has been inserted. At the beginning of a so-called initial spinning phase, the ring traveler 10 is to be accelerated by the thread 3. In this initial spinning phase, thread breaks occur frequently due to excessively high forces, which act on the thread 3 because of the required acceleration.
[0020] In a schematic diagram, FIG. 2 shows a spinning ring 8 with an attached ring traveler 10. The twist transferred to the ring traveler 10 via the thread 3 causes the ring traveler 10 to rotate about the spinning ring 8 in the direction of rotation 11. This rotation in turn causes a centrifugal force 12, which acts on the ring traveler 10 and forces the ring traveler 10 against the inside of the spinning ring 8. This situation is illustrated on an enlarged scale in FIG. 3, where the ring traveler 10 slides along the spinning ring 8, resulting in a sliding surface 13. At least in the area of this sliding surface 13, it is necessary to ensure that the ring traveler 10 has good anti-friction properties with respect to the spinning ring 8. The frictional forces that occur in particular during the initial spinning phase with acceleration of the ring traveler 10 from a standstill can be reduced by coating the ring traveler 10 with an anti-friction coating, at least in the high-stress region 13.
