Spinning of yarn

Details Spinning of yarn Spinning of yarn

1986-05-20

1987-11-10

Watkins, Donald

Textiles: spinning, twisting, and twining

Apparatus and processes

Open end spinning

57408, D01H 1135, D01H 7898

Patent

active

047048530

DESCRIPTION:

BRIEF SUMMARY
This invention relates to spinning, that is forming fibres into a yarn.
The traditional, and fundamental, actions of spinning are the provision of a band or sliver of fibres, the arranging of fibres from the band into a yarn of required size and the insertion of twist to stop the yarn from reverting to individual fibres.
Many techniques have been proposed to make spinning more efficient and these generally have both advantages and disadvantages which lead to a particular technique being preferred for a particular type of yarn or speed of production or degree of automation or other factor which is significant to the potential user.
It is an object of the invention to provide a spinning technique which uses uncomplicated, robust apparatus to spin fibres into yarn in a straightforward manner.
According to the invention there is provided a method of spinning fibres into yarn including defined gap, immediately they are opened, onto the yarn as it is withdrawn, including a twist.
The fibres may be directed to the surface by an air flow. The air flow may be in part at least a suction exerted through the surface. The surface may be stationary or moving and may be porous.
The fibres may be directed to the surface by an electrostatic force.
The fibres may be held to the surface for building onto the yarn.
The yarn may be a yarn extending over and across the surface or a yarn beginning over the surface.
The output yarn may be wholly spun from supplied fibres or may be a core with supplied fibres spun onto it and including a twist.
The surface may be maintained within reach of fibres being opened.
According to the invention there is a spinning apparatus including means to open fibres from a supply of fibres, a surface to receive said opened fibres positioned close to the place where the fibres are opened, means to direct said opened fibres toward said surface, means to position a yarn over the surface, means separate from but close to said surface to twist the yarn, means to withdraw the yarn, from the surface through said twisting means, said opened fibres directed towards said surface being spun onto the yarn to include a twist.
There may be means to draw air through the surface to hold fibres directed toward the surface for spinning onto the yarn.
The apparatus may include a groove having an included angle of less than 90.degree.. The groove may have an apical portion more steeply inclined than the rest of the groove.
The twister may be a parallel-belt twister.
The surface may be positioned within reach of fibres being opened.
Embodiments of the invention will now be described with reference to the accompanying drawing in which:
FIGS. 1, 2 and 3 show in schematic form various forms of a spinning apparatus according to the invention, and
FIG. 4 shows details of the arrangement of the spinning apparatus in FIG. 3 .
In a preferred embodiment fibres are opened from a sliver in a conventional opening or separator device of a wheel fitted with angled pins and revolved rapidly in a closely conforming housing. The sliver is introduced between the housing and the rapidly moving pins at one angular position around the wheel and the opened fibres discharged from between the housing and the wheel at another angular position at a considerable speed. The fibres are discharged from the outlet of the opening wheel towards a surface close to the opening wheel through a gap in a space which is partly enclosed. A yarn is also present in the gap and is caused to twist in the space by a means outside the gap, such as a conventional false-twist device. (It is noted that a true twist is actually put into the yarn.) The closeness of the surface to the opening wheel is such that the gap is no larger than the length of the fibres. In some embodiments the gap is much less than the length of the fibres.
The opened fibres are directed towards the surface in a suitable manner, for example air drawn through the surface or electrostatic forces, and are collected on the twisting yarn to build on it as it is withdrawn by suitable take-up means beyo

REFERENCES:
patent: 3845611 (1974-11-01), Senturk
patent: 3855772 (1974-12-01), Burlet
patent: 4174605 (1979-11-01), Pallay
patent: 4296598 (1981-10-01), Faure
patent: 4488397 (1984-12-01), Venot
patent: 4497168 (1985-02-01), Kamp

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