Yarn spinning method and apparatus therefor

Claim 2

A yarn spinning method of the open-end spinning system, which comprises supplying fibers tobe processed into an inner rotor from upper portion thereof, said inner rotor being disposed in an outer rotor having an inner screw surface so as to be differentially rotated with respect to said outer rotor, discharging successively the fibers supplied into said inner rotor from this rotor at one vertical position thereof onto said screw surface of the outer rotor so as to cross uniformly the screw threads of said screw surface, collecting the fibers distributed on said screw surface at another position of said inner rotor with the progression of the rotation of the rotors thereby to form a sliver at said position, transfering the thus formed sliver toward a spinning-out direction and drawing the thus transferred sliver by means of drawing rolls while twisting said sliver.

Claim 3

A yarn spinning apparatus adapted for the open-end spinning system, which comprises: a fiber supplying means for supplying the fibers to be processed into the apparatus; an outer rotor having an inner screw surface; an inner rotor disposed in said outer rotor and provided with a top hollow portion adapted to suck thereinto the fibers supplied from said fiber supplying means, a split slot adapted to discharge and press the fibers introduced therein onto the screw surface of said outer rotor owing to the centrifugal force of said inner rotor, a bottom guide hole, and means adapted to collect the fibers pressed on said screw surface thereby to form a sliver and to transfer the thus formed sliver toward said bottom guide hole of the inner rotor; means adapted to establish a difference between the same directional rotations of said outer and inner rotors thereby to cause uniform distribution of the fibers discharged from said split slot over said screw surface owing to said difference of the rotations of said outer and inner rotros; and means adapted to draw out the sliver from said guide hole while subjecting said drawn sliver to twisting.

Claim 4

A yarn spinning apparatus adapted for the open-end spinning system, which comprises: a fiber supplying means for supplying the fibers to be processed into the apparatus; an outer rotor having an inner screw surface; an inner rotor disposed in said outer rotor and provided with a top hollow portion adapted to suck thereinto the fibers supplied from said fiber supplying means, a split slot adapted to discharge and press the fibers introduced therein onto the screw surface of said outer rotor owing to the centrifugal force of said inner rotor, a bottom guide hole, and means adapted to collect the fibers pressed on said screw surface thereby to form a sliver and to transfer the thus formed sliver toward said bottom guide hole of the inner rotor; means adapted to establish a difference between the same directional rotations of said outer and inner rotors thereby to cause uniform distribution of the fibers discharged from said split slot over said screw surface owing to said difference of the rotations of said outer and inner rotros; and means adapted to draw out the sliver from said guide hole while subjecting said drawn sliver to twisting.

Claim 5

A yarn spinning apparatus as claimed in claim 2, in which the inner rotor is provided with a top hollow shaft, and the split slot of the inner rotor is communicated with the inner hole of said hollow shaft and opened at its side portion so as to cross vertically the screw thread of the screw surface of the outer rotor, whereby the fiber supplied into said hollow shaft are discharged out and pressed onto said Screw surface in uniformly and parallelly distributed states.

Claim 6

A yarn spinning apparatus as claimed in claim 2, in which the fiber collecting and transferring means provided in the inner rotor comprises an endless apron band which is provided at its one side with teeth adapted to be engaged with the screw surface of the outer rotor, whereby said apron band is caused to undergo rotation with a speed corresponding to product of the screw-pitch of said screw surface and the difference between the rotations of the outer and inner rotors.

Claim 7

A yarn spinning apparatus as claimed in claim 4, in which the teeth of the endless apron band are parallelly provided on one side of the outer periphery of said band, each of said teeth having a width corresponding to about 1/4 - 1/2 of the width of said band thereby to leave a blank space on said periphery and the thus formed blank space being connected to the root part of side face of said teeth, whereby the fibers pressed distributedly onto the screw surface of the outer rotor are collected onto said side faces of the teeth, thus forming a sliver, and the thus formed sliver, is held between said space and the screw surface of the outer rotor and successively transferred toward a spinning-out direction.

Claim 8

A yarn spinning apparatus as claimed in claim 2, in which the bottom guide hole of the inner rotor is provided in the bottom shaft of said inner rotor so as to be slanted and communicated at its top end with a split slot provided in the inner rotor and enclosing therein the endless apron band, said guide hole being opened at its bottom end to the central outlet of the bottom shaft of the inner rotor, whereby dispersion of the fiber free ends of the sliver drawn out from said guide hole while being twisted is suppressed by the inner wall of said guide hole, said dispersion being due to centrifugal force caused by said twisting.

Claim 9

A yarn spinning apparatus as claimed in claim 2, in which the outer rotor is formed of upper and lower parts which are separately assembled as one body, and the means adapted to establish a difference between the same directional rotations of the outer and inner rotors comprises whorls provided respectively at top and bottom portions of the outer rotor, pulleys, bearings inserted between said top whorl and the top hollow shaft of the inner rotor and between said bottom whorl and the bottom shaft of the inner rotor, another whorl attached to the upper part of said hollow shaft and having a diameter differing from that of the afore-mentioned whorls which are respectively pressed frictionally onto said pulleys, and means adapted to drive said pulleys, whereby the outer and inner rotors are caused to be differentially rotated.