Spinning method and device of drafting with initial twist

Abstract

The present invention relates to a method and spinning device for drafting single yarns. The method comprises drafting fiber strands into twistless fiber strands, bringing a primary twist action upon fiber strands in the vortex twist zone, integrating and compressing fiber strands on the suction member to form column fiber strands, outputting column fiber strands and twisting them into spun yarns. The spinning device comprises a drafting mechanism with suction members, wherein the front drafting pair consists of a front rubber roller, a block rubber roller, and a suction member, an air guide member is installed on the suction member, and the block rubber roller, air guide member, and the suction member jointly form a vortex twist zone which fiber strands can pass through.

Claims

1. A method for drafting spun yarn, comprising: feeding twisted fiber strands into a drafting mechanism to draft and obtain twistless fiber strands at an output holding jaw of the drafting mechanism; moving said twistless fiber strands output from the output holding jaw into a vortex twist zone disposed between the output holding jaw and a block jaw, the vortex twist zone drawing in air to form an air eddy causing a primary twist action upon the twistless fiber strands so that each of the twistless fiber strands obtain an axial twist along an axis of the twistless fiber strands to create axial-twisted fiber strands; integrating and compressing the axial-twisted fiber strands via a suction action of a suction member forming part of the vortex twist zone to create column fiber strands; and twisting the column fiber strands output from the block jaw of the drafting mechanism to create spun yarn, wherein, an input diameter of the axial-twisted fiber strands is no greater than four times an output diameter of the spun yarn.

2. The method for drafting spun yarn according to claim 1, which is characterized in that said output holding jaw includes a front rubber roller and the suction member, said block jaw includes a block rubber roller and the suction member, an air guide member located between the front rubber roller and the block rubber roller is installed above said suction member, and said vortex twist zone is an area formed by the front rubber roller, block rubber roller, air guide member, and the suction member to allow the twistless fiber strands to pass through.

3. The method for drafting spun yarn according to claim 2, which is characterized in that said suction member is a cylindrical member equipped with a group of first arc grooves in a side wall, said group of first arc grooves are parallel to each other and are bent along a circumference of the suction member, said suction member having a hollow area of said suction member connected to an external air extractor, said air guide member having a substrate laid along an axis of the suction member, said substrate equipped with a group of parallel second arc grooves, said group of parallel second arc grooves being bent along the axis of the suction member, wherein said group of first arc grooves and said group of parallel second arc grooves are perpendicular to each other.

4. The method for drafting spun yarn according to claim 3, which is characterized in that said group of parallel second arc grooves along the axis of the suction member allow outside air to first go along the group of parallel second arc grooves of the air guide member into the vortex twist zone via suction action of the external air extractor, allowing outside air to then proceed along the group of first arc grooves of the suction member into the hollow area of the suction member, and be extracted by the external air extractor so that an air eddy rotating around an axis of the twistless fiber strands is formed in the vortex twist zone.

5. A spinning device for drafting spun yarn, comprising: a drafting mechanism with drafting pairs including: a front drafting pair including a front rubber roller, a block rubber roller, and a suction member, said front rubber roller and the suction member forming an output holding jaw and said block rubber roller and the suction member forming a block jaw, the front drafting pair further including an air guide member located between the front rubber roller and the block rubber roller installed above said suction member, said suction member including a side wall having a first suction channel equipped therein, said air guide member including a second suction channel equipped therein, and said front rubber roller, block rubber roller, air guide member, and suction member jointly forming a vortex twist zone to enable fiber strands to pass through.

6. The spinning device for drafting spun yarn according to claim 5, which is characterized in that said first suction channel is a group of first arc grooves which are parallel to each other and are bent along a circumference of the suction member, said suction member including a hollow area connected to an external air extractor, said second suction channel formed by a group of second arc grooves which are parallel to each other and are bent along an axis of the suction member, wherein said group of first arc grooves and said group of second arc grooves are perpendicular to each other.

7. The spinning device for drafting spun yarn according to claim 6, which is characterized in that said air guide member has a substrate laid along the axis of the suction member and said second arc grooves are set in the substrate.

8. The spinning device for drafting spun yarn according to claim 7, which is characterized in that the substrate of said air guide member has a curvature to match the suction member.

9. The spinning device for drafting spun yarn according to claim 6, which is characterized in that said drafting pairs further comprise a middle drafting pair and a rear drafting pair, said middle drafting pair including a middle rubber roller and a middle roller, and said rear drafting pair including a rear rubber roller and a rear roller.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows the structure of the spinning device of an embodiment of the present invention.

(2) FIG. 2 and FIG. 3 show the mating between the suction member and the air guide member in the embodiment in FIG. 1.

(3) FIG. 4 shows the vortex twist zone in the embodiment in FIG. 1. The arrow in the figure is the air flow direction.

(4) FIG. 5 shows the structural change of fiber strands in the vortex twist zone in the embodiment in FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

(5) The following further describes the invention in combination with the drawings and an embodiment. The present is not limited to the given embodiment.

(6) Embodiment

(7) As shown in FIG. 1 through FIG. 5, the spinning device for drafting single yarns in the embodiment comprises a drafting mechanism with several drafting pairs further comprising a front drafting pair at least; said drafting mechanism further comprises a cylindrical suction member (10); said front drafting pair consists of a front rubber roller (7), a block rubber roller (8), and a suction member (10), said front rubber roller (7) and the suction member (10) form the output holding jaw (16) and said block rubber roller (8) and the suction member (10) form the block jaw (17), an air guide member (9) located between the front rubber roller (7) and the block rubber roller (8) is installed above said suction member (10), a first suction channel is equipped in the side wall of said suction member (10), a second suction channel is equipped in said air guide member (9), and said front rubber roller (7), block rubber roller (8), air guide member (9), and suction member (10) jointly form a vortex twist zone (15) which fiber strands (18) can pass through.

(8) As shown in FIG. 2 and FIG. 3, said first suction channel is a group of first arc grooves (14) which are parallel to each other and are bent along the circumference of the suction member (10), the hollow area of said suction member (10) is connected to an external air extractor (not shown in the figures), said second suction channel is a group of second arc grooves (13) which are parallel to each other and are bent along the axis of the suction member (10), and the bending directions of said first arc grooves (14) and second arc grooves (13) are vertical to each other. The bending directions of the second arc grooves (13) in FIG. 2 and FIG. 3 are opposite. The air guide member (9) has a substrate laid along the axis of the suction member (10) and the second arc grooves (13) are set in the substrate. The substrate of said air guide member (9) has a curvature to match the suction member (10).

(9) The drafting pairs further comprise a middle drafting pair and a rear drafting pair, said middle drafting pair consists of a middle rubber roller (5) and a middle roller (6), and said rear drafting pair consists of a rear rubber roller (3) and a rear roller (4).

(10) In addition, the spinning device in the embodiment further comprises a yarn guide hook (11) and a bobbin (12).

(11) The method for drafting single yarns in the embodiment comprises the following steps:

(12) step 1. feed fiber strands (2) with a twist through the roving bobbin (1) into the drafting mechanism to draft and obtain twistless fiber strands (18) at the output holding jaw (16) of the drafting mechanism,

(13) step 2. move said fiber strands (18) to the vortex twist zone (15) which draws in air from the outside to form an air eddy, which brings an overturn action to primarily twist fiber strands (18) so that fiber strands (18) have an original twist, along the axis of fiber strands, and integrate and compress fiber strands (18) on the suction member (10) under the suction action of the suction member (10) under the vortex twist zone (15) to form column fiber strands,

(14) The specific process is as follows: outside air first goes along the second arc grooves (13) of the air guide member (9) into the vortex twist zone (15) under the suction action of the external air extractor, then along the first arc grooves (14) of the suction member (10) into the hollow area of the suction member (10), and are finally extracted by the external air extractor so that an air eddy rotating round the axis of fiber strands (18) is formed in the vortex twist zone (15).

(15) step 3. output said column fiber strands from the block jaw (17) of the drafting mechanism and twist them into spun yarns, wherein the diameter of column fiber strands obtained in step 2 is at most four times that of spun yarns obtained in step 3.

(16) In the present embodiment, the suction member (10) provides the functions of drafting fiber strands and forming a vortex twist zone.

(17) Besides the present embodiment, the present invention has other embodiments. All technical solutions formed by adopting equivalent replacement or transformation should fall within the scope of the claims of the present invention.