Yarn-Forming Element for a Roving Machine as well as a Roving Machine Equipped Therewith

• US 20190323151A1
• Filed: 05/04/2017
• Published: 10/24/2019
• Est. Priority Date: 05/26/2016
• Status: Active Grant

• Current Assignee: Maschinenfabrik Rieter AG (Rieter Holding AG)
• Original Assignee: Maschinenfabrik Rieter AG (Rieter Holding AG)
• Inventors: Haska, Petr, Griesshammer, Christian
• Granted Patent: US 10,900,144 B2
• Time in Patent Office: Days
• CPC Class Codes: D01H 1/115 using pneumatic means
• CPC Class Codes: D01H 5/72 Fibre-condensing guides
• CPC Class Codes: D01H 7/92 for imparting transient twist , i.e. false twist D01H1/11 takes precedence

Abstract

A yarn-forming element is provided for a roving machine that produces a roving from a fiber structure using compressed air. The yarn-forming element includes an intake opening for fibers of the fiber structure, an outlet for emergence of the roving produced from the fiber structure, and a draw-off channel that connects the intake opening and the outlet. A front end surrounding the intake opening is formed as a first truncated cone in at least some sections thereof. The first truncated cone includes a larger base surface and a smaller opposite cover surface that is adjacent the draw-off channel. An angle (a) between a lateral line of the first truncated cone and an axis of the first truncated cone is less than 90° and greater than 70°.

Claims

1-11. -11:

(canceled)

12. A yarn-forming element for a roving machine for producing a roving from a fiber structure using compressed air, the yarn-forming element comprising:

an intake opening for fibers of the fiber structure;

an outlet for emergence of the roving produced from the fiber structure;

a draw-off channel that connects the intake opening and the outlet;

a front end surrounding the intake opening, the front end formed as a first truncated cone in at least some sections thereof;

the first truncated cone comprising a larger base surface and a smaller opposite cover surface adjacent the draw-off channel; and

wherein an angle (a) between a lateral line of the first truncated cone and an axis of the first truncated cone is less than 90° and

greater than 70°

.

13. The yarn-forming element according to claim 12, wherein the draw-off channel comprises a longitudinal axis that is or colinear with the axis of the cone.

14. The yarn-forming element according to claim 12, the draw-off channel comprises an inside diameter in an area adjacent to the intake opening of 4 mm to 12 mm.

15. The yarn-forming element according to claim 12, further comprising a cylindrical wall with a cylindrical outside surface and a concentric cylindrical inside surface bordering the draw-off channel in an area adjacent the intake opening, and wherein an entirety of the front end of the yarn-forming element connecting the cylindrical outside surface and the cylindrical inside surface defines the first truncated cone.

16. The yarn-forming element according to claim 12, further comprising a transition region between the front end and the draw-off channel and a transition region between the front end and an outside surface of the yarn-forming element, wherein one or both of the transition regions are rounded.

17. The yarn-forming element according to claim 12, further comprising a chamfer formed in the front end in the shape of a second truncated cone, the second truncated cone comprising a larger base surface adjacent an outside surface of the yarn-forming element and an opposite smaller cover surface adjacent the base surface of the first truncated cone.

18. The yarn-forming element according to claim 17, wherein the chamfer forms an angle (β

) with a longitudinal axis of the draw-off channel of between 20° and

70°

.

19. The yarn-forming element according to claim 12, further comprising a second trucated cone situated above the first truncated cone in a side view of the yarn-forming element, the second truncated cone surrounding the first truncated cone in a top view of the yarn-forming element.

20. The yarn-forming element according to claim 19, wherein the second truncated cone is connected directly to the first truncated cone, wherein the first and second truncated cones are concentric.

21. The yarn-forming element according to claim 19, wherein a lateral line of the first truncated cone and a lateral line of the second truncated cone form a different respective angle (ε

, δ

) with a longitudinal axis of the draw-off channel.

22. A roving machine for producing a roving from a fiber structure, comprising:

at least one spinneret;

the spinneret comprising an eddy chamber with an intake opening for the fiber structure and a yarn-forming element extending at least partially into the eddy chamber;

air jets directed into the eddy chamber, by means of which air is introduced into the eddy chamber in a predetermined direction of rotation in order to impart a twist to the fiber structure fed through the intake opening in a region of an intake opening of the yarn-forming element; and

wherein the yarn-forming element is according to claim 15.