Textiles: spinning – twisting – and twining – Apparatus and processes – Open end spinning
Patent
1979-09-05
1982-09-14
Petrakes, John
Textiles: spinning, twisting, and twining
Apparatus and processes
Open end spinning
57 91, D01H 112
Patent
active
043488595
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method and an apparatus for the production of fancy yarn.
The basic concept in a known method for the production of fancy yarn is that the fancy material is thrown into the nip between two rotating yarn spinning cylinders which spin the loose basic yarn twist, the fancy material being admixed to the basic yarn twist.
While this method is suited for the production of fancy yarn in which the fancy material serving to provide the finished yarn effect is of particulate or spheroid shape, it is not suited for the production of fancy yarn in which the fancy material is to have elongate form, since it has proved that such elongate fancy material pieces, on introduction to the cylinder nip, often roll up into balls and are fixed in this shape on being spun together with the basic twist, so that the finished fancy yarn displays unsightly knops of fancy material. Alternatively, the fancy material might not, on being spun together with the basic twist, be properly spun into the twist, with the result that the fancy material comes loose when the yarn is woven. Furthermore, it is difficult to realize a reproducible fancy yarn with this prior art method, that is to say a yarn in which the fancy material lies consistently in desired positions in the yarn.
SUMMARY OF THE INVENTION
For avoiding these disadvantages in the above-discussed known method, the present invention has realized a method and an apparatus which permit the production of fancy yarn with elongate fancy pieces in the basic yarn twist and which permit fancy yarn reproduction. Basic yarn material is formed into basic yarn twists in the nip between rotating spinning cylinders. The nip is subjected to a partial vacuum, and fancy material pieces are introduced into the nip in order to be included in the basic yarn twists. The fancy material pieces, within the region of the partial vacuum, are flung against a screen for further conveyance to the nip. The fancy material pieces can be elongate and can be flung against the screen by means of a jet injector which is supplied with the fancy material pieces by means of a suction conduit of the injector. The frequency, length and thickness of the fancy material pieces in the fancy yarn can be adjusted by means of a programming mechanism which is operative to influence the driving of fancy-material-drawing rollers which create the fancy material pieces.
The apparatus for carrying out the method of this invention includes two spinning cylinders for yarn spinning, means for causing a partial vacuum in the nip between the cylinders, and a means for supplying the basic yarn material to the nip. The apparatus further includes a screen in the proximity of the nip and a means for flinging, with the assistance of gas under pressure, the fancy material pieces against the screen. The means for flinging can consist of a jet injector having a suction conduit which supplies the fancy material pieces. The screen can consist of a surface on a guide plate which is disposed to guide, with its opposite surface, the basic yarn material to the nip. The apparatus can also include a programming mechanism which is operative to control the driving of rollers producing the fancy material pieces and connected to the flinging means, for determining the length, frequency and thickness of fancy material in the fancy yarn.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in greater detail below with reference to the accompanying drawing.
FIG. 1 is a schematic illustration of an apparatus according to the invention in an "open end" type spinning frame.
FIG. 2 schematically illustrates a screen with an injector at a yarn spinning cylinder.
FIG. 3 illustrates the effect of the apparatus according to the invention on the fancy material.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an "open end" machine (DREF) for yarn production together with an apparatus according to the invention for the production of fancy yarn. Pairs of licker-in rollers 1, 1', drawing rollers 2, 2' and supply rolle
REFERENCES:
patent: 4002016 (1977-01-01), Fischer et al.
patent: 4070811 (1978-01-01), Fehrer
patent: 4107909 (1978-08-01), Fehrer et al.
patent: 4109454 (1978-08-01), Fehrer et al.
patent: 4144703 (1979-03-01), Ingham, Jr.
patent: 4160359 (1979-07-01), Frentress
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