JPH0554564U - Nozzle block of spinning device - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the drop rate in pneumatic spinning equipment. [Structure] A nozzle 3 is provided which faces the downstream side and the tangential direction of the internal space and opens toward the axial center side.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a nozzle block in a device for producing a spun yarn by twisting an untwisted short fiber bundle drafted by a drafting device by causing a swirling air flow to twist the bundle.

[0002]

[Prior Art]

 The present applicant previously proposed a pneumatic spinning device for producing a real twist spun yarn as shown in FIG. 1 and has already filed an application (Japanese Patent Application No. 2-403102 etc.).

The device has a nozzle block 2 having a nozzle 3 that causes a swirling air flow to act on a fiber bundle that has exited the draft device, a fiber bundle passage 10, and is rotated by a drive device such as rotating rollers 7 and 8. It comprises a spindle 6, a guide member support 4 fixed in the nozzle block 2, and a guide member 12 protruding toward the spindle inlet 6a with its tip directed and attached to the guide member support 4.

[0004]

[Problems to be solved by the device]

 The nozzle 3 of the above-described conventional spinning device faces the downstream slightly away from the inlet 6a of the spindle 6 and, as shown in FIG. 3, is close to the inner wall 2a of the nozzle block 2 in a tangential direction. Since it is formed, the air flow in the hollow chamber 12 portion shown in FIG. 1 is weak, and the ratio of cotton flies to the supplied fibers (fluffing rate) is high.

The present invention aims to reduce the cotton drop rate in such a pneumatic spinning device.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the nozzle block of the spinning device of the present invention has a nozzle that faces the downstream side and the tangential direction of the internal space and that opens toward the axial center side.

[0007]

[Work]

 In the nozzle block of the spinning device configured as described above, the fibers are swirled by the air flow ejected from the nozzle toward the axial core side, and the floating fibers are attracted toward the axial core side. Then, the floating fibers attracted to the axis side are drawn into the swirling fibers.

[0008]

【Example】

 A spinning device in which the nozzle block of the present invention is adopted will be described with reference to FIGS. 1 and 2.

This spinning device is arranged next to a draft part consisting of a back roller, a middle roller having an apron, and a front roller, and a nozzle block 2 having a nozzle 3 arranged inside a casing 1. The guide member support 4 is fixed to the inside thereof and has a guide member 5, and the rotating spindle 6 is inserted into the casing 1 on the inlet side.

The spindle 6 is surrounded by three rollers 7, 8 and 9 (the roller 9 is on the front side of FIG. 1 and not shown) and is circumscribed and circumscribed. One of them is a driving roller, which can achieve a much higher speed of 50,000 to 200,000 rpm than that of the one in which the spindle 6 is directly rotated by a belt (30,000 rpm).

A fiber bundle passage 10 is formed through the center of the spindle 6, and the center of this passage 10 and each center of the casing 1 are positioned on the same straight line that coincides with the traveling path of the fiber bundle. There is. The outer diameter of the inlet 6a of the spindle 6 is sufficiently small, and the portion following the inlet 6a is a conical portion 6b whose outer diameter increases toward the downstream side.

The portion of the casing 1 covering the spindle 6 has a hollow 11 having a small diameter cylindrical shape formed by a bush 11 in the vicinity of the inlet 6a of the spindle 6; Shaped hollow chamber 13. The front of the small-diameter hollow chamber 12 is formed into a cylindrical shape having a diameter slightly larger than the tip diameter of the spindle 6 by the nozzle block 2, and the cylindrical portion serves as a guide passage for the fiber bundle. In front of the conical hollow chamber 13, an annular hollow chamber 14 and a tangential air escape hole 15 following it are formed. An air suction pipe is connected to the air escape hole 15.

Inside the casing 1, a hollow air reservoir 16 is formed between the casing 1 and the nozzle block 2. The nozzle block 2 is formed with four air injection nozzles 3 which are in communication with the air reservoir 16 and face downstream slightly away from the inlet 6 a of the spindle 6 and are tangential to the hollow chamber 12. An air hose 18 is connected to the air reservoir 16 through a hole 17. The direction of the nozzle 3 is set to be the same as the rotation direction of the spindle 6.

FIG. 2 shows the vicinity of the nozzle opening of the nozzle block 2 of the present invention. According to this, the nozzle 3 is open toward the center away from the inner wall 2 a of the nozzle block 2. That is, when the inner diameter of the nozzle block 2 is 2R, the inner diameter of the spindle inlet 6a is Ds, the inner diameter of the nozzle 3 is d, and the distance from the axis of the nozzle block 2 to the axis of the nozzle 3 is L, then Ds The injection port of the nozzle 3 is positioned so that the relationship of + 2 + d / 2 <L <R−d / 2 is established. By doing so, the air jetted from the nozzle 3 is jetted near the spindle inlet 6a side, and works to attract the floating fibers to the spindle inlet 6a side.

The compressed air supplied from the hose 18 flows into the air reservoir 16 and then is ejected from the nozzle 3 into the hollow chamber 12 to generate a high-speed swirling airflow in the vicinity of the spindle inlet 6a. After swirling in the hollow chamber 12, this air flow diffuses outward while swirling in the conical hollow chamber 13, is guided to the escape hole 15 and is discharged. At the same time, this air flow produces a suction air flow which flows into the hollow part of the casing 1 from the nip point of the front roller.

The guide member support 4 has a columnar shape with a thin cylindrical portion protruding at one end, and one side thereof is cut out to form a gap 19 between the nozzle block 2 and the guide passage of the fiber bundle. I am trying. Further, in the longitudinal direction of the guide member support body 4, a fine hole is formed which matches the center line of the passage 10 of the spindle 6, and the pin-shaped guide member 5 is inserted into the fine hole.

The guide member 5 projects from the pores of the guide member support body 4 and has its tip free, and faces the inlet 6 a of the spindle 6. The guide member 5 has a diameter smaller than the passage diameter of the inlet 6a of the spindle 6, and has a tip formed with a smooth curve. Further, in the figure, the tip is shown at a position slightly entering the passage 10 from the inlet 6a of the spindle 6, which state is the most preferable, and the yarn to be produced is also closest to the ring yarn. It has an appearance. However, depending on the conditions, it is possible to take the position away from the end face of the inlet 6a, and it is possible to manufacture a yarn having an appearance similar to that of a ring yarn. These yarns are comparable in strength properties to ring yarns.

In the spinning device configured as described above, the fiber bundle that has exited from the front roller of the draft device is removed from the gap 19 between the nozzle block 2 and the guide member support 4 by the action of the air flow ejected from the nozzle 3. The front ends of all the fibers of the fiber bundle that are drawn into the casing 1 are drawn from the periphery of the guide member 5 into the fiber bundle that is being formed into a yarn and guided into the spindle. Further, the rear end side of the fiber is inverted from the spindle inlet 6a and separated into each fiber. The separated fibers at the rear end are exposed to the swirling airflow ejected from the nozzle 3, and as the yarn travels, the fibers are spirally wound around the fiber bundle that is being formed into yarn and become spun yarn in the form of a true twist. .. At that time, the floating fibers are attracted to the air flow jetted from the nozzle 3 toward the spindle inlet 6a, and are attracted to the spindle inlet 6a side. Then, the attracted floating fibers are attracted to the separated fibers at the rear end. The guide member 5 acts as a so-called pseudo core, which prevents the propagation of twist in the yarn forming process or temporarily acts as a substitute for the central fiber bundle, and is a non-twisted yarn that remarkably appears in the conventional air-bonded spun yarn. It functions to prevent the formation of core fiber bundles and effectively form the yarn only from the wound fibers.

Here, the inner diameter 2R of the nozzle block 2 is 4.5 mm, the inner diameter d of the nozzle 3 is 0.6 mm, and the distance L from the axis of the nozzle block 2 to the axis of the nozzle 3 is 1.6 mm or 1 ． The cotton drop rate and the yarn strength when spun at a yarn speed of 250 m / min using a 27.9 G / Y (pellet / yard) carded cotton of 75 mm were examined, and the results shown in Table 1 below were obtained. was gotten.

[0020]

[Table 1]

From the above table, it can be seen that the cotton drop rate in this invention is less than half that in the conventional example. In the case of L = 1.75 mm, the thread strength is slightly lowered, but in the conventional one, the thread strength tends to be visibly lowered when the cotton drop rate is reduced. Considering this, the yarn drop strength is reduced to a level that does not cause any problem, and the cotton drop rate is greatly reduced. This is also very effective.

In this embodiment, a device of twisting with a spindle is described, but a guide member is provided at the first nozzle inlet of another spinning device, for example, a two-nozzle type bundled spun yarn manufacturing device. Alternatively, a spinning device using a nozzle and a nip type twister may be applied to a one-nozzle type spinning device depending on conditions. Further, the spindle 6 assists in twisting the yarn and can be manufactured depending on the yarn even if the yarn does not rotate. Therefore, the spindle 6 does not necessarily have to rotate.

[0023]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects.

That is, since the nozzle is opened closer to the axial center side of the inner space of the nozzle block, the cotton drop rate can be reduced to half or less of the conventional one without increasing or almost changing the yarn strength.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a pneumatic spinning device.

FIG. 2 is a view around a nozzle opening portion of the nozzle block of the present invention.

FIG. 3 is a diagram of the vicinity of a nozzle opening of a conventional nozzle block.

[Explanation of symbols]

 1 Casing 2 Nozzle Block 3 Nozzle 4 Guide Member Support 5 Guide Member 6 Spindle 6a Spindle Inlet

Claims (1)

[Scope of utility model registration request] 1. A nozzle block of a spinning device, which has a nozzle that faces the tangential direction on the downstream side of the internal space and that opens toward the axial center side.