Friction twister element

Claim 2

In a textile yarn false twist friction twisting device including hollow spindle means mounted for rotation about its longitudinal axis and friction twisting element means on said spindle means, the improvement comprising yarn engaging surface means on said element means configured in cross section as an arc of a circle, said surface means being at least a portion of a surface of a torus, and wherein the diameter of the hole passing through said torus is in the ratio of 2 to 1 up to 4 to 1 to the minor radius of said torus.

Claim 3

The improvement of claim 1 wherein said ratio is in the range of 3 to 1 up to 4 to 1.

Claim 4

The improvement of claim 1 wherein said ratio is approximately 3.5 to 1.

Claim 5

In a textile yarn false twist friction twisting device including hollow spindle means mounted for rotation about its longitudinal axis and friction twisting element means on said spindle means, the improvement comprising said friction twisting element being in the shape of a torus and wherein the diameter of the hole passing through said torus is in the ratio of 1 to 1 up to 2 to 1 to the minor diameter of said torus.

Claim 6

In a textile yarn false twist friction twisting device including hollow spindle means mounted for rotation about its longitudinal axis and friction twisting element means on said spindle means, the improvement comprising said friction twisting element being in the shape of a torus and wherein the diameter of the hole passing through said torus is in the ratio of 1 to 1 up to 2 to 1 to the minor diameter of said torus.

Claim 7

The improvement of claim 4 wherein said ratio is in the range of 1.5 to 1 up to 2 to 1.

Claim 8

The improvement of claim 4 wherein said ratio is approximately 1.75 to 1.

Claim 9

A friction twisting element for use in a textile yarn false twist friction twisting device comprising a toroidal element adapted to be mounted for rotation about its longitudinal axis, wherein the diameter of the hole passing through said toroidal element is in the ratio of 1 to 1 up to 2 to 1 to the minor diameter of said toroidal element.

Claim 10

A friction twisting element for use in a textile yarn false twist friction twisting device comprising a toroidal element adapted to be mounted for rotation about its longitudinal axis, wherein the diameter of the hole passing through said toroidal element is in the ratio of 1 to 1 up to 2 to 1 to the minor diameter of said toroidal element.

Claim 11

A friction twisting element according to claim 7 wherein said ratio is in the range of 1.5 to 1 up to 2 to 1.

Claim 12

A friction twisting element according to claim 7 wherein said ratio is approximately 1.75 to 1.

Claim 13

A friction twisting element for use in a textile yarn false twist friction twisting device comprising a hollow friction twisting spindle having an inner surface defining a longitudinal bore therein, a toroidal element mounted at one end of said spindle, a groove being formed at the one end of said spindle and complementarily shaped to mate with said toroidal element such That the depth of said groove when measured inwardly is slightly more than the radius of the cross-sectional thickness of said toroidal element adjacent the one end of said spindle and the inside diameter of said toroidal element is less than the diameter of said inner surface of said spindle, and a portion of the surface of said toroidal element presents a yarn engaging surface that is configured in cross section as an arc of a circle, wherein said arc of a circle is approximately a 90* arc plus an angle defined between the actual path of the yarn to be twisted and a yarn path contacting only 90* of said yarn engaging surface when said actual path contacts more than 90* of said surface.

Claim 14

A friction twisting element for use in a textile yarn false twist friction twisting device comprising a hollow friction twisting spindle having an inner surface defining a longitudinal bore therein, a toroidal element mounted at one end of said spindle, a groove being formed at the one end of said spindle and complementarily shaped to mate with said toroidal element such That the depth of said groove when measured inwardly is slightly more than the radius of the cross-sectional thickness of said toroidal element adjacent the one end of said spindle and the inside diameter of said toroidal element is less than the diameter of said inner surface of said spindle, and a portion of the surface of said toroidal element presents a yarn engaging surface that is configured in cross section as an arc of a circle, wherein said arc of a circle is approximately a 90* arc plus an angle defined between the actual path of the yarn to be twisted and a yarn path contacting only 90* of said yarn engaging surface when said actual path contacts more than 90* of said surface.

Claim 15

A friction twisting element for use in a textile yarn false twist friction twisting device comprising a hollow friction twisting spindle having an inner surface defining a longitudinal bore therein, a toroidal element mounted at one end of said spindle, a groove being formed at the one end of said spindle and complementarily shaped to mate with said toroidal element such that the depth of said groove when measured inwardly is slightly more than the radius of the cross-sectional thickness of said toroidal element adjacent the one end of said spindle and the inside diameter of said toroidal element is less than the diameter of said inner surface of said spindle, and a portion of the surface of said toroidal element presents a yarn engaging surface that is configured in cross section as an arc of a circle, wherein said arc of a circle is approximately a 90* arc minus an angle defined between the actual path of the yarn to be twisted and a yarn path contacting only 90* of said yarn engaging surface when said actual path contacts less than 90* of said surface.

Claim 16

A friction twisting element for use in a textile yarn false twist friction twisting device comprising a hollow friction twisting spindle having an inner surface defining a longitudinal bore therein, a toroidal element mounted at one end of said spindle, a groove being formed at the one end of said spindle and complementarily shaped to mate with said toroidal element such that the depth of said groove when measured inwardly is slightly more than the radius of the cross-sectional thickness of said toroidal element adjacent the one end of said spindle and the inside diameter of said toroidal element is less than the diameter of said inner surface of said spindle, and a portion of the surface of said toroidal element presents a yarn engaging surface that is configured in cross section as an arc of a circle, wherein said arc of a circle is approximately a 90* arc minus an angle defined between the actual path of the yarn to be twisted and a yarn path contacting only 90* of said yarn engaging surface when said actual path contacts less than 90* of said surface.

Claim 17

A friction twisting element according to claim 7 wherein said element is a polyurethane element.

Claim 18

A friction twisting element according to claim 12 wherein said polyurethane element has a Durometer hardness in the range of approximately 50 to 60 on the A scale.

Claim 19

A friction twisting element for use in a textile yarn false twist friction twisting device comprising yarn engaging surface means on said element configured in cross section as an arc of a circle, said surface means being at least a portion of a surface of a torus, and wherein the diameter of the hole passing through said torus is in the ratio of 2 to 1 up to 4 to 1 to the minor radius of said torus.

Claim 20

A friction twisting element for use in a textile yarn false twist friction twisting device comprising yarn engaging surface means on said element configured in cross section as an arc of a circle, said surface means being at least a portion of a surface of a torus, and wherein the diameter of the hole passing through said torus is in the ratio of 2 to 1 up to 4 to 1 to the minor radius of said torus.

Claim 21

A friction twisting element according to claim 14 wherein said ratio is in the range of 3 to 1 up to 4 to 1.

Claim 22

A friction twisting element according to claim 14 wherein said ratio is approximately 3.5 to 1.

Claim 25

A method in accordance with claim 17, wherein the yarn path to said yarn engaging surface which contacts only 90* of said surface is perpendicular to the yarn departing from said yarn engaging surface.

Claim 26

A method in accordance with claim 18, wherein the yarn departing from said yarn engaging surface is passed through said hollow spinDle substantially parallel to the longitudinal axis of said spindle.