JP2010508449A5 - - Google Patents

Claims (20)

A textile machine provided with a device for drafting a sliver (39), in particular a spinning machine, comprising a draft device comprising at least one first and second roller pair (61, 62) forming a main draft zone The first roller pair includes a main draft bottom roller (64) having a bottom apron (65), and the main draft bottom roller (64) includes a top roller (66). And a top apron assembly provided with a top apron (68) guided through the top roller (66).
The diameter (D) of the bottom roller (64) for the main draft is 30 mm or more,
The bottom apron (65) is wound around the main draft bottom roller (64) at a winding angle (α) of 140 ° or more,
The bottom draft roller for the main draft supports the outer layer made of plastic with optimal adhesion properties for the bottom apron
A textile machine characterized by that. Each draft device or twin draft device formed from two adjacent draft devices has one dedicated main draft bottom roller, and the main draft bottom roller is the same fiber. 2. The fiber according to claim 1, wherein the fiber is formed separately and independently from a main draft bottom roller of another draft device of the machine, and the bottom roller or the twin bottom roller is individually driven. machine. 3. Textile machine according to claim 1 or 2, characterized in that the main draft bottom roller (64) supports the outer layer with a thickness of 0.5 mm or more. 4. Textile machine according to claim 1, wherein the main draft bottom roller (64) supports an outer layer of elastomer, in particular natural rubber and / or synthetic rubber. . The textile machine according to any one of claims 1 to 4, wherein the drafting device does not have an entrance roller, so that a pre-draft is not required. The bottom apron (114) is brought close to the vicinity of the clamping line between the outlet roller pair (110, 111) via a guide (118) in the form of a turning bridge on the outlet side. The textile machine of any one of Claims. The textile machine according to claim 1, wherein an additional guide element (119) is provided for bringing the bottom apron (114) closer to the outer peripheral surface of the bottom roller (112). A lateral restriction (120) is provided which serves to prevent the bottom apron (114) from being deflected from the bottom roller (112) or falling over the bottom roller (112). A textile machine according to any one of claims 1 to 7. 9. The main draft bottom roller (112) and the deflection bridge (118), the guide element (119) and the lateral restriction means (120) are supported on a holding device (205). The textile machine of any one of Claims. 10. The drafting device according to any one of the preceding claims, wherein the drafting device houses a twin top roller pair having a common axis corresponding respectively to two adjacent drafting devices (201a, 201b). Textile machine. 11. One holding device (205) is provided for each main draft bottom roller (112) or for each main draft twin roller pair. Textile machine. The textile machine according to any one of claims 1 to 11, wherein the twin-roller pair for main draft is supported by the holding device (205) in a cantilevered manner via its coupling shaft. Textile machine according to any one of the preceding claims, wherein the turning bridge (118) extends consistently and extends in the machine longitudinal direction over all or a large number of spinning parts. . The main draft bottom roller (64) or the main draft twin roller pair is formed as a structural assembly, and the roller shaft (208) is removed from the holding device by lifting and using only a few hand grips. 14. A textile machine as claimed in any one of claims 1 to 13, which is adapted to be exchanged. The sliver can be supplied to the drafting devices (201a, 201b) via a pretensioning device in the main draft zone between the main draft bottom roller (64) and the corresponding top roller. 15. The textile machine according to any one of items 14 to 14. Between the bottom apron assembly and the top apron assembly, in order to avoid slipping on surfaces that are at least partially in contact with each other, by means of convex and concave portions or notches that engage with each other, a shape fastening guide, The textile machine according to any one of claims 1 to 15, wherein a drive coupling portion having a particularly shape fastening is formed. The textile machine according to any one of claims 1 to 16, wherein the draft device is a focusing draft device including a mechanical or pneumatic focusing device. A dedicated drive device is arranged correspondingly to the bottom roller (64), or the bottom roller is centrally driven 1 extending over all working parts or working parts in the machine longitudinal direction via transmission means 18. A textile machine according to claim 1, wherein the textile machine is configured to extract torque from one cylinder, in which case a friction drive, a gear drive or a toothed belt drive is provided. . The draft device for a textile machine according to any one of claims 1 to 18. The bottom roller of a textile machine according to any one of claims 1 to 18.