JPS6051571B2 - Suction duct of suction twisting device - Google Patents

Description

Detailed Description of the Invention The present invention improves the rotational efficiency (twisting efficiency) of fiber bundles adsorbed and collected on the upper surface of a running belt as a mesh structure running body in an adsorption heating spinning method. The purpose is to propose a new shape of the suction duct of an adsorption/heating device that can stabilize and improve the quality of the thread.

In the adsorption heating spinning method, a material 1, which is an aggregate of fibers, is supplied to a supply roller 2, and is spread into single fibers by teeth on the peripheral surface of a fiber opening roller 3 rotating at high speed, and these single fibers are passed through a fiber supply duct. 4
fly into the air current.

As shown in FIG. 1, the lower end opening of the fiber supply duct 4 is opened in a rectangular shape long from side to side, facing a running belt 5 having a mesh structure such as a wire mesh running in a direction perpendicular to the plane of the paper. A suction duct 6 having a rectangular opening similar to the rectangular opening of the fiber supply duct 4 at its upper end is provided across the fiber supply duct 4, and this suction duct 6 communicates with a negative pressure generating device (not shown). , is sucked downward with a constant suction force. The single fibers that have flown through the fiber supply duct 4 are oriented parallel to the long side direction of the lower end opening of the fiber supply duct 4, and are attracted and collected on the upper surface of the running belt 5. As shown in FIG. 2, the fiber bundle 11 thus attracted and collected is subjected to a thrust F in the traveling direction by the running belt 5 and a suction force N due to the airflow of the suction duct, but the fiber bundle 11 resists the thrust F. The strength of the suction air A of the suction duct 6 is set so that a strong suction force N is applied to hold the fiber bundle 11 at a position directly below the lower end opening of the fiber supply duct 4. fiber bundle 11
is given a rotational force M with the longitudinal direction of the fiber bundle itself as the rotation axis due to the frictional force with the running belt 5 running in the direction W, rotates on the running belt 5 and is heated, and becomes a pair of threads. The paper is spun by a drawing roller 7. In such a conventional device, the opening of the suction duct 6 is aligned with the center line a as shown in FIG.
- It had a rectangular shape symmetrical to a.

Therefore, the wind speed distribution of the air sucked into the suction duct 6 is symmetrical with respect to the center line aa as shown in FIG. It is located approximately at the center of the short side (center line a-a). Therefore, when spinning the suction heated yarn, the rotational position of the fiber bundle 11 that has been suctioned and collected on the upper surface of the running belt 5 is at the short side of the suction duct 6. Center line a-a of the side and wall surfaces 6a and 6b of the long side of the suction duct 6
Among them, it is located between the running belt 5 and the wall surface 6b on the downstream side in the running direction. On the other hand, as the fiber bundle 11 rotates and is pulled out as a thread in the long side direction of the suction duct 6 by the spinning force T, one end of the single fiber has become fluffy and has not been completely rolled up (the other end is rolled up). ) is attracted to the mesh of the running belt 5, which has a size several times the diameter of the single fiber, and is therefore pulled to the right in FIG. 4 as the running belt 5 runs.

Therefore, the fiber bundle 11 moves together with the single fibers to the position indicated by the broken line on the right in FIG. 4 and escapes from the upper surface of the opening of the suction duct 6. The fiber bundle that has escaped to the broken line position is returned to its normal rotational position by the spinning force T, but while it is escaping, no heating action is performed on the fiber bundle 11, resulting in a decrease in rotational efficiency (twisting efficiency), There was a problem of deterioration of thread quality due to uneven twisting. Such a phenomenon may occur when the thrust force F acting on the fiber bundle 11 becomes larger than the pullback force due to the suction force N of the suction duct 6 at a location where the coefficient of friction is large, such as a joint of the running belt. This problem also tends to occur when, of the air sucked into the suction duct 6 through the running belt, there is more air from the upstream side in the running direction of the running belt 5 than from the downstream side. In view of the above, the present invention has provided that one of the long side wall surfaces of the rectangular opening of the suction duct that opens facing the running belt, particularly the wall surface on the downstream side in the running direction of the running belt, is formed into an uneven shape such as a staggered shape or a corrugated shape. This prevents the fiber bundle from escaping.

In the embodiment shown in FIGS. 5 and 6, among the long side wall surfaces 6a and 6b forming the rectangular opening of the suction duct 6, the wall surface 6b is located on the downstream side in the running direction of the running belt 5.
It is formed in a comb tooth-shaped uneven shape. That is, protrusions 61 are formed at certain intervals on the wall surface 6b, and the openings have an asymmetrical shape with respect to the center line a-a. Note that the surface of the convex portion 61 facing the wall surface 61a (this may also be a line)
It is preferable that the line S is located near the center line aa. As shown in FIG. 6, the wind speed distribution of the air sucked into the suction duct 6 is a solid line in which the position of maximum wind speed is closer to the wall surface 6a on the upstream side in the running direction of the running belt 5 from the center line a-a. Move to the position. Therefore, since the rotational position of the fiber bundle 11 is almost on the center line a-a of S, even if the fiber bundle 11 escapes, it will at most move to the position indicated by the broken line and will not reach the upper surface of the opening of the suction duct 6. This reduces the risk of it being separated from the top surface of the opening. In addition, since the rotational position of the fiber bundle 11 moves to the upstream side in the running direction of the running belt 5 compared to the conventional case, the amount of air sucked into the suction duct 6 from the downstream side in the running direction increases compared to the conventional case. The phenomenon in which the fiber bundle 11 escapes from the rotational position to the downstream side is also less likely to occur. 7th
Figures A and b each show examples with different uneven shapes.

A has a staggered shape, and C has a wavy shape. Incidentally, in any of the embodiments, the unevenness may not be arranged at equal intervals but may be arranged at irregular intervals. As is clear from the above description, according to the present invention, since the fiber bundle heated on the upper surface of the mesh structure running body is less likely to escape due to the running of the mesh structure running body, the rotation efficiency (twisting efficiency) is improved. This has the advantage that the rotation of the fiber bundle is stabilized, uneven twisting is eliminated, and yarn quality is improved.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view of the adsorption heating device, Figure 2 is an enlarged cross-sectional view of the main parts of Figure 1 taken at right angles to the paper, and Figure 3 is a horizontal cross-section taken along line I-1 in Figure 2. 4 is an enlarged cross-sectional view of a main part explaining the operation of a conventional suction duct, FIG. 5 is a perspective view of an embodiment of the suction duct of the present invention, and FIG. In the enlarged view, the cross section taken along the line ■--■ in FIG. 5, and FIGS. 7A and 7B are plan views of the suction duct opening having different uneven shapes, respectively. 4. Fiber supply duct, 5. Traveling belt (mesh structure traveling body), 6. Suction duct, 6a. Upstream wall surface, 6b. Downstream wall surface, 61. Convex portion, 11.. fiber bundle.

Claims (1)

[Claims] 1. One of the long side wall surfaces of the rectangular opening facing the mesh structure traveling body, particularly the wall surface on the downstream side in the traveling direction of the traveling body, is characterized by having an uneven shape such as a staggered shape or a wave shape. Suction duct of adsorption heating device.