US3924398A — Method of and apparatus for open end spinning fro…

Claim 1

Independent Claim 220 words

In a method of open end spinning yarn from staple fibers in a spinning apparatus having a rotary underpressure spinning chamber mounted in an air lubricated bearing, a feeding channel for feeding fibers from a fiber opening mechanism merging into said spinning chamber through a stationary lid, and a yarn withdrawing element, in the form of a hollow pin passing through the hollow shaft of the spinning chamber with a predetermined clearance, opposite the lid of the spinning chamber and engaging its front opening and lubricating air being blown into said clearance, the improvement wherein within the inner space of the rotary underpressure spinning chamber there are joined three air flows, of which a first one is an air flow passing together with the fibers through the feeding channel, a second air flow being fed from the ambient atmosphere through the hollow pin for withdrawing the yarn and a third air flow is fed through the clearance between the hollow pin and the hollow shaft of the spinning chamber, said air flow forming a resulting air flow inside the spinning chamber preventing fiber losses and the wrapping of fibers about the yarn being formed therein, said resulting air flow escaping through an outlet slot between the stationary lid and the front margin of the spinning chamber into a collecting space.

Claim 2

Dependent Claim 220 words

In a method of open end spinning yarn from staple fibers in a spinning apparatus having a rotary underpressure spinning chamber mounted in an air lubricated bearing, a feeding channel for feeding fibers from a fiber opening mechanism merging into said spinning chamber through a stationary lid, and a yarn withdrawing element, in the form of a hollow pin passing through the hollow shaft of the spinning chamber with a predetermined clearance, opposite the lid of the spinning chamber and engaging its front opening and lubricating air being blown into said clearance, the improvement wherein within the inner space of the rotary underpressure spinning chamber there are joined three air flows, of which a first one is an air flow passing together with the fibers through the feeding channel, a second air flow being fed from the ambient atmosphere through the hollow pin for withdrawing the yarn and a third air flow is fed through the clearance between the hollow pin and the hollow shaft of the spinning chamber, said air flow forming a resulting air flow inside the spinning chamber preventing fiber losses and the wrapping of fibers about the yarn being formed therein, said resulting air flow escaping through an outlet slot between the stationary lid and the front margin of the spinning chamber into a collecting space.

Claim 3

Dependent Claim 102 words

A method as claimed in claim 1, wherein the rate of air flow of the separate air flows has a mutual relation given by the range: QV:Q1:Q2:Q3 100 : (70+90) : (2+20) : (1+20) in which QV denotes the rate of air flow escaping through the outlet slot; Q1 denotes the rate of air flow in the feeding channel; Q2 denotes the rate of air flow in the passage in the hollow pin forming the yarn withdrawing channel; and Q3 denotes the rate of air flow passing through the clearance between the hollow pin and the hollow shaft of the spinning chamber.

Claim 4

Dependent Claim 229 words

In an apparatus for the open end spinning of yarn from staple fibers in a rotary underpressure spinning chamber mounted in an air lubricated bearing, said apparatus having a feeding channel for feeding fibers from a fiber opening mechanism merging into said spinning chamber through a stationary lid, and a yarn withdrawing element, in the form of a hollow pin passing through the hollow shaft of the spinning chamber with a predetermined clearance disposed opposite the lid of the spinning chamber engaging its front opening, and means for blowing lubricating air into said clearance, the improvement which comprises means joining with the inner space of the rotary underpressure spinning chamber three air flows, of which a first one is an air flow passing together with the fibers through the feeding channel, a second air flow is fed from the ambient atmosphere through the hollow pin for withdrawing yarn and the third air flow is fed through the clearance between the hollow pin and the hollow shaft of the spinning chamber, said air flows forming a resulting air flow inside the spinning chamber preventing fiber losses and the wrapping of fibers about the yarn being formed therein and an outlet slot for said resulting air from said resulting air flow, said outlet slot being disposed between the stationary lid and the front margin of the spinning chamber and collecting space.

Claim 5

Dependent Claim 229 words

In an apparatus for the open end spinning of yarn from staple fibers in a rotary underpressure spinning chamber mounted in an air lubricated bearing, said apparatus having a feeding channel for feeding fibers from a fiber opening mechanism merging into said spinning chamber through a stationary lid, and a yarn withdrawing element, in the form of a hollow pin passing through the hollow shaft of the spinning chamber with a predetermined clearance disposed opposite the lid of the spinning chamber engaging its front opening, and means for blowing lubricating air into said clearance, the improvement which comprises means joining with the inner space of the rotary underpressure spinning chamber three air flows, of which a first one is an air flow passing together with the fibers through the feeding channel, a second air flow is fed from the ambient atmosphere through the hollow pin for withdrawing yarn and the third air flow is fed through the clearance between the hollow pin and the hollow shaft of the spinning chamber, said air flows forming a resulting air flow inside the spinning chamber preventing fiber losses and the wrapping of fibers about the yarn being formed therein and an outlet slot for said resulting air from said resulting air flow, said outlet slot being disposed between the stationary lid and the front margin of the spinning chamber and collecting space.

Claim 6

Dependent Claim 29 words

Apparatus as claimed in claim 3 comprising an underpressure source for withdrawing the resulting air flow from the spinning chamber, said underpressure source being connected to said collecting space.

Claim 7

Dependent Claim 32 words

Apparatus as claimed in claim 4, wherein the underpressure source for withdrawing the resulting air flow from the spinning chamber is located in the collecting space into which the outlet slot opens.

Claim 8

Dependent Claim 20 words

Apparatus as claimed in claim 4 wherein the underpressure source is formed by a part of the rotary spinning chamber.

Claim 9

Dependent Claim 21 words

Apparatus as claimed in claim 4 wherein the underpressure source is formed by the outer surface of the rotary spinning chamber.

Claim 10

Dependent Claim 40 words

Apparatus as claimed in claim 4, comprising a baffle inserted between the feeding channel on one side, and the opening through the hollow pin and the clearance opening between the hollow pin and the hollow shaft on the other side.

Claim 11

Dependent Claim 11 words

Apparatus as claimed in claim 8, wherein the baffle is disc-shaped.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-12-08	1979-06-09	1979-12-09	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-12-08	1983-06-09	1983-12-09	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-12-08	1987-06-09	1987-12-09	$7700.00	Window Closed / Lapsed

Method of and apparatus for open end spinning from staple fibers

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