JPH0577769B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) This invention relates to a clearer device in a binding spinning device.

(Prior art) In bundle spinning, the sliver supplied to a drafting device is drafted into a wide ribbon-like fiber bundle and continuously supplied to a twisting nozzle, where the sliver is twisted by an air vortex in the twisting nozzle.・It is spun into yarn after being untwisted. In addition, in a binding spinning device, yarn is produced at a spinning speed more than 10 times that of a conventional ring spinning machine, etc., and the rotation speed of each roller in the drafting device is also high, so the influence of the accompanying airflow of the front roller is large, and it is easy for the generation of fluff or the winding of the fibers around the roller.

In order to solve the above-mentioned problem, as shown in FIG. 6, the front bottom roller 33, middle bottom roller 34, apron 35 and back bottom roller 36 of the drafting device 32, which are disposed close to the twisting nozzle 31, have been replaced. A suction box 37 is disposed in a covering state, and each roller 33,
34, that is, the width of the suction port 37a is wider than the length of the shaped portion that can be useful for drafting the fiber bundle;
There is a clearer device equipped with 37b. However,
If the width of the suction port is wider than the effective length, the third
As shown in the figure, since the wind speed is higher at both ends, air flows from the center to both ends, causing turbulence in the fibers.
As shown in Fig. 7, the accompanying airflow A generated by the high-speed rotation of the front roller changes its direction in the axial direction of the front roller at the nip point and moves forward, so that both ends of the fiber bundle fed to the front roller are There is an inconvenience that the fibers that have passed through the front roller in a disordered state and protruding from the front roller rejoin the fiber bundle when the fiber bundle is supplied to the twisting nozzle 31, causing the generation of slabs.

(Problems to be Solved by the Invention) The present invention solves the problem of the conventional device in that slabs are frequently generated due to the influence of the wind speed difference at the position in the width direction of the suction port and the accompanying airflow of the front roller.

Structure of the Invention (Means for Solving Problems) In the present invention, a suction box is provided to cover at least the circumferential surfaces of a front bottom roller and a middle bottom roller of a drafting device that drafts a sliver into a ribbon-like fiber bundle. In this case, suction ports were provided at positions close to the front bottom roller and the middle bottom roller, respectively. Among the suction ports, the width of the suction port on the side corresponding to the middle bottom roller is formed to be narrower than the effective length of the middle bottom roller.

(Operation) The sliver supplied to the drafting device is drafted into a wide ribbon-like fiber bundle between the rollers of the drafting device, and then supplied to the twisting nozzle. The fluff generated when the sliver is drafted between the rollers is removed by suction from a suction port formed in the suction box. The strongest accompanying airflow is generated in the front roller, which rotates at the highest speed among the rollers, and the traveling direction of the accompanying airflow is on both sides along the axial direction of the front roller near the nip point of the front roller, that is, at the tip of the apron. change towards. However, due to the suction airflow from the suction port formed at the position corresponding to the middle bottom roller of the suction box, the accompanying airflow is prevented from disturbing both ends of the sliver, and the sliver is always kept in a stable state by the front roller. The yarn is supplied to the twisting nozzle through the twisting nozzle, and the occurrence of slabs in the spun yarn due to the action of the twisting nozzle is extremely reduced.

(Example) Examples 1 to 5 which embody this invention will be described below.
This will be explained according to the diagram. As shown in FIG. 1, above the trumpet 1 is a draft device 3 which drafts the sliver S supplied through the trumpet 1 and supplies it to the twisting nozzle 2 as a ribbon-shaped fiber bundle.
is installed. The draft device 3 is composed of back rollers 4a, 4b, middle rollers 5a, 5b, aprons 6a, 6b, and front rollers 7a, 7b, and the bottom roller side of the draft device 3 includes a front bottom roller 7a, an apron 6a, and a middle bottom roller 5a. A suction box 8 is disposed to cover the circumferential surface. The suction box 8 is connected to an air intake source (not shown) by a suction pipe 9, and has suction ports 8a and 8b formed at a position facing the front bottom roller 7a and a position facing the middle bottom roller 5a, respectively. As shown in FIG. 2, the widths W of both suction ports 8a and 8b are narrower than the effective lengths of the front bottom roller 7a and middle bottom roller 5a, respectively. The effective length here refers to the length of the shape that can serve for drafting the fiber bundle. Specifically, it corresponds to the length of the part where the lines and knurling are carved.

Next, the operation of the apparatus configured as described above will be explained. The sliver S supplied from the trumpet 1 to the drafting device 3 is drafted into a ribbon-like fiber bundle by the drafting device 3 and supplied to the twisting nozzle 2, where it is spun as yarn Y by the action of the twisting nozzle 2. When the sliver S is drafted into a wide ribbon-like fiber bundle between the rollers of the drafting device, fluff is generated, but the generated fluff is removed by suction airflow from the suction ports 8a and 8b of the suction box 8. be done. One suction port 8a is connected to the front roller 7
The fluff generated between the twisting nozzle 2 and the twisting nozzle 2 is removed by suction, and the other suction port 8b collects the fluff generated when being drafted between the rollers.

The suction airflow of one suction port 8b has almost no effect on the state of the fiber bundle even if the width and arrangement position of the suction port is changed; however, by changing the width of the other suction port 8b, the apron 6a, 6b The influence on the fiber bundle at the tip changes. FIG. 3 shows the results of measuring the wind velocity distribution at the measurement points at the tip of the apron shown in FIGS. 4a and 4b while changing the width W of the suction port. As shown in FIG. 3, when the width W of the suction port 8b is as large as 40 mm, the position corresponding to the circumferential surface of the front bottom roller (i.e., the measurement point B,
The difference between the wind speed in C and D) and the wind speed on the side of the front bottom roller (measurement points A and E) is extremely large, and the wind speed on the side of the front roller is larger than the wind speed on the circumferential surface of the front roller. This is thought to be the reason why fiber bundles were disturbed between the apron tip and the front roller in the conventional device, resulting in frequent occurrence of slabs. On the other hand, when the width W of the suction port 8b is as narrow as 20 mm, the wind speed at the position corresponding to the circumferential surface of the front roller is larger than the value when the width W is wide, and conversely, the wind speed on the sides of the front roller is small. Become,
The difference between the wind speed on the circumferential surface of the front roller and the wind speed on the sides of the front roller is reduced.
That is, by narrowing the width W of the suction port 8b, the effect of disturbing the fiber bundle at the tip of the apron is reduced, and the occurrence of slabs is reduced. In any case, the reason why the wind speed at the position corresponding to the front roller circumferential surface is smaller than the wind speed at the side is because the apron 6a protrudes from the tensile bar 10. Also, the length of each roller 5a, 7a is approximately
It is 35mm.

In addition to the disturbance at both ends of the fiber bundle, the cause of slab generation is that fluff or fibers that are moving along the apron 6a toward the suction port 8b due to the suction action of the suction port 8b are formed on the front bottom roller. It is also conceivable that the fibers come into contact with the grooves and are drawn into the fiber bundle again, causing slabs.
To solve this problem, by narrowing the width of the suction port 8b, the wind speed on the peripheral surface of the front roller, that is, the suction action of the suction port 8b, is strengthened, and the fibers once released from the fiber bundle are quickly sucked into the suction port 8b. Since the front roller prevents the fibers from being drawn into the fiber bundle again, the occurrence of slabs is reduced.

Furthermore, if the end of the fiber bundle supplied to the twisting nozzle 2 is disordered, it may cause yarn breakage, etc., but by preventing this disorder of the fiber bundle, the incidence of yarn breakage can be reduced. is also helpful. FIG. 5 shows the results of measuring the relationship between the width W of the suction port 8b and the number of broken threads per spindle. The number of broken threads decreased as the width W of the suction port became narrower, and the number of broken threads was halved when the width W was 20 mm compared to when the width W was 50 mm. The effect of reducing the incidence of slab generation and yarn breakage by narrowing the width W of the suction port 8b becomes more effective as the spinning count becomes larger, that is, as the spun yarn becomes thinner and the number of fibers in the fiber bundle decreases. It got bigger.

Note that the present invention is not limited to the above-mentioned embodiments. For example, the width of the suction port 8a corresponding to the front bottom roller 7a may be increased, or the length of the suction port 8b corresponding to the middle bottom roller 5a may be increased. or change the opening position to the front bottom roller 7a.
It is also possible to arbitrarily change the shape, structure, etc. of each part without departing from the spirit of the present invention, such as by moving the parts closer to each other.

Effects of the Invention As detailed above, according to the present invention, fluff generated in the draft portion is smoothly suctioned and removed from the suction ports formed at positions corresponding to the front bottom roller and the middle bottom roller, and
Unlike conventional devices, the suction airflow from the suction port formed at the position corresponding to the middle bottom roller prevents the fiber bundle from being disturbed at the tip of the apron, and the fiber bundle is stably supplied from the front roller to the twisting nozzle. As a result, the occurrence of slabs is reduced and the yarn breakage rate is also reduced, which is an excellent effect.

[Brief explanation of drawings]

1 to 5 show an embodiment embodying the present invention, in which FIG. 1 is a partially cutaway side view, and FIG.
The figure is a schematic diagram showing the relationship between the roller and the clearer suction port, Figure 3 is a diagram showing the wind speed distribution at the tip of the apron, Figure 4a is a front view showing the measurement points of the wind speed distribution in Figure 3, Fig. 4b is a side view, Fig. 5 is a diagram showing the relationship between the width of the suction port and thread breakage, Fig. 6 is a side view of the conventional device, and Fig. 7 is a schematic diagram showing the accompanying airflow of the front roller section. It is a diagram. Twisting nozzle...2, Draft device...3, Middle bottom roller...5a, Apron...6a, 6
b, Front bottom roller...7a, Suction box...8, Suction port...8a, 8b, Width of the suction port...
...W.

Claims (1)

[Claims] 1. A suction box is arranged to cover at least the circumferential surface of the front bottom roller and the middle bottom roller of a drafting device that drafts the sliver into a ribbon-like fiber bundle, and the suction box is located at a position close to the front bottom roller and the middle bottom roller of the box. A clearer device in a binding spinning device, in which each suction port is provided, and the width of the suction port on the side corresponding to the middle bottom roller is narrower than the effective length of the middle bottom roller.