False twist device for an open-end spinning device

Patent metadata

Field	Value
Publication number	US-9580841-B2
Application number	US-201514718728-A
Country	US
Kind code	B2
Filing date	May 21, 2015
Priority date	May 21, 2014
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

A false twist device for an open-end spinning device to introduce a false twist in a yarn has a largely tubular carcass and several false twist edges arranged behind one another in the yarn draw-off direction and inclined by an angle in the carcass with regard to the yarn draw-off direction. The false twist edges protrude in such a way into the interior of the tubular carcass that the yarn experiences a deflection on each one of the false twist edges. The several false twist edges are arranged offset in such a way in the carcass in circumferential direction that the yarn simultaneously experiences a spatial deflection compared to its regular yarn draw-off direction through the successive deflections on the several false twist edges.

First claim

The invention claimed is:

1. A false twist device for an open-end spinning device to introduce a false twist in a yarn produced in the open-end spinning device, the false twist device comprising:
a tubular carcass;
a plurality of false twist edges arranged behind one another in a yarn draw-off direction through the device, each of the false twist edges inclined at an angle (α) in the carcass relative to the yarn draw-off direction;
the plurality of false twist edges configured in an interior of the carcass such that each individual false twist edge imparts a deflection to a yarn drawn through the carcass; and
the plurality of false twist edges offset in a circumferential direction in the carcass such that the yarn drawn through the carcass is also simultaneously subjected to a spatial, helical, deflection through the successive deflections on the false twist edges.

2. The false twist device according to claim 1 , wherein the false twist edges have a height within the carcass greater than one-half of an inner diameter of the carcass.

3. The false twist device according to claim 1 , comprising at least three of the false twist edges.

4. The false twist device according to claim 3 , wherein three of the false twist edges are arranged circumferentially offset to one another by a circumferential offset angle 120°.

5. The false twist device according to claim 1 , wherein the false twist edges are defined as webs that are inserted into the carcass.

6. The false twist device according to claim 1 , wherein the device is configured as a detachable insert that can be inserted in the open-end spinning device.

7. The false twist device according to claim 1 , further comprising a plurality of cylindrical or semi-cylindrical sections arranged behind one another in the yarn draw-off direction, wherein one of the false twist edges in provided in each respective one of the sections.

8. The false twist device according to claim 7 , wherein each section comprises at least one positioning element that positions the section in a defined circumferential offset angle relative to an adjacent section.

9. The false twist device according to claim 7 , wherein the sections are made of ceramic, metal or plastic.

10. The false twist device according to claim 1 , wherein the device is configured as a detachable insert that can be inserted in the open-end spinning device, and further comprising a housing that surrounds the insert.

11. An open-end spinning device of a rotor spinning machine, comprising:
a yarn draw-off nozzle;
a false twist device arranged downstream from the yarn draw-off nozzle in a yarn draw-off direction;
the false twist device further comprising:
a tubular carcass;
a plurality of false twist edges arranged behind one another in a yarn draw-off direction through the device, each of the false twist edges inclined at an angle (α) in the carcass relative to the yarn draw-off direction;
the plurality of false twist edges configured in an interior of the carcass such that each individual false twist edge imparts a deflection to a yarn drawn through the carcass; and
the plurality of false twist edges offset in a circumferential direction in the carcass such that the yarn drawn through the carcass is also simultaneously subjected to a spatial, helical, deflection through the successive deflections on the false twist edges.

12. The open-end spinning device according to claim 11 , wherein the false twist device is arranged in the yarn draw-off direction directly behind the yarn draw-off nozzle.

13. The open-end spinning device according to claim 12 , the yarn draw-off nozzle and the false twist device have a common, detachable housing arranged in the open-end spinning device.

14. The open-end spinning device according to claim 11 , further comprising a draw-off tube arranged downstream from the false twist device, the draw-off tube defining an additional false twist edge for the yarn.

15. A method for introducing a false twist in a yarn generated in an open-end spinning device of a rotor spinning machine, comprising:
drawing the yarn off through a yarn draw-off nozzle;
pulling the yarn through a plurality of false twist edges in a false twist device arranged downstream from the yarn draw-off nozzle, whereby a false twist is imparted to the yarn; and
imparting a spatial, helical deflection to the yarn with the false twist edges to provide an additional component of the false twist imparted to the yarn.

Assignees

• Rieter Ag Maschf

Inventors

• Stahlecker Gerd
• Krohmer Siegfried
• BAUR GüNTER
• Basting Michael

Classifications

• D01H4/40 Primary

  Removing running yarn from the yarn forming region, e.g. using tubes · CPC title

• D01H7/90

  Arrangements with two or more {spinning or} twisting devices {of different types} in combination (D01H7/88 takes precedence) · CPC title