Ringless spinning of separated staple fibres

Claim 3

A rotry spinning chamber for ringless spinning of separated staple fibers, comprising a cup-shaped rotary chamber having an open side and an axially spaced closed side provided with an outlet, both of said sides extending in planes transverse to the axis of rotation of said chamber; an inner circumferential slip wall extending and diverging from said open side radially outwardly and toward said closed side for slipping of fibers deposited thereon under the influence of centrifugal force; a drop wall extending from said slip wall towards said closed side and diverging further radially outwardly and in the direction of said closed side and a draw-off wall forming a jucntion with said drop wall and extending from said drop wall to said closed side and converging in the direction thereof, said draw-off wall defining with said drop wall a sliver-forming groove having a cross section resembling a triangle the shortest and a longer side of which have a ratio of between 1:1.5 and 1:5 and of which said shortest side is formed by said drop wall and said longer side is formed by said draw-off wall, so that sliver formed in said groove will have a corresponding cross-section of a triangle a further side of which faces radially inwardly of said chamber while said shortest and longer sides respectively lie on said drop wall and said draw-off wall whereby, when said sliver is initially withdrawn along said draw-off wall and thereupon along said axis of rotation and through said outlet, said sliver becomes twisted due to its rotation with said chamber relative to the sliver section which is being withdrawn, and becomes further twisted due to friction with said draw-off wall.

Claim 4

A rotry spinning chamber for ringless spinning of separated staple fibers, comprising a cup-shaped rotary chamber having an open side and an axially spaced closed side provided with an outlet, both of said sides extending in planes transverse to the axis of rotation of said chamber; an inner circumferential slip wall extending and diverging from said open side radially outwardly and toward said closed side for slipping of fibers deposited thereon under the influence of centrifugal force; a drop wall extending from said slip wall towards said closed side and diverging further radially outwardly and in the direction of said closed side and a draw-off wall forming a jucntion with said drop wall and extending from said drop wall to said closed side and converging in the direction thereof, said draw-off wall defining with said drop wall a sliver-forming groove having a cross section resembling a triangle the shortest and a longer side of which have a ratio of between 1:1.5 and 1:5 and of which said shortest side is formed by said drop wall and said longer side is formed by said draw-off wall, so that sliver formed in said groove will have a corresponding cross-section of a triangle a further side of which faces radially inwardly of said chamber while said shortest and longer sides respectively lie on said drop wall and said draw-off wall whereby, when said sliver is initially withdrawn along said draw-off wall and thereupon along said axis of rotation and through said outlet, said sliver becomes twisted due to its rotation with said chamber relative to the sliver section which is being withdrawn, and becomes further twisted due to friction with said draw-off wall.

Claim 5

A method as described in claim 1, said annular recess being bounded by a drop wall and a draw-off wall which are mutually inclined at said ratio.

Claim 6

A method as defined in claim 3, said chamber having an axial end through which said yarn is withdrawn, and said draw-off wall being at a side of said recess which is closer to said axial end than said drop wall, with said longer side of said triangle being located on said draw-off wall.

Claim 7

A method as defined in claim 1, wherein the length of an axial section representing the length over which sliver is twisted and converted into yarn on said draw-off wall has a ratio of between 1 : 2 and 4 : 1 with reference to said longer side of said triangle.

Claim 8

A method as defined in claim 1, wherein the distance between a point of said draw-off wall at which said sliver is lifted off the latter and a plane of separation of said drop wall and said draw-off wall equals between 1 and 3 times the length of said longer side of said triangle.

Claim 9

A method as defined in claim 1, wherein the distance between a point of said draw-off wall at which said sliver is lifted off the latter and a lateral margin of sliver in said recess is between 1 and 4 mm.

Claim 10

A rotary spinning chamber as defined in claim 2, wherein an imaginary plane normal to the axis of rotation of said spinning chamber and passing through the junction of said drop wall and draw-off wall defines with the general plane of the former wall an angle of between - 30* and + 20*, and with the general plane of the latter wall an angle of between 40* and 70*.

Claim 11

A rotary spinning chamber as defined in claim 2, wherein the length of said drop wall in axial direction of said chamber relative to the length of said draw-off wall has a ratio of between 1 : 1.1 and 1 : 8.

Claim 12

A rotary spinning chamber as defined in claim 2, wherein said drop wall merges with said draw-off wall on a radius which in axial direction of said chamber amounts to between 0.1 and 1.8 mm.

Claim 13

A rotary spinning chamber as defined in claim 2; further comprising a withdrawing tube extending through said outlet from the interior to the exterior of said chamber.

Claim 14

A rotary spinning chamber as defined in claim 11, wherein said withdrawing tube is at least in part adjustable in direction of rotation of said chamber.