JPH0510479U - Spinning equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the drop rate in pneumatic spinning equipment. A nozzle block 2 having a nozzle 3 for causing a swirling air flow to act on a fiber bundle exiting a draft device, a rotating or stationary spindle 6 having a fiber bundle passage 8, and a spindle inlet 6a provided in the nozzle block 2. It comprises a guide member 5 protruding toward the tip, and an airflow restricting bush 17 provided downstream of the passage 9 of the swirling airflow along the spindle 6 and having a narrowed portion 17a having an inner diameter smaller than its inner diameter.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an apparatus 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 applicant has previously proposed a pneumatic spinning device for producing a real twist spun yarn, which is configured by removing the airflow restricting bush 17 from the one shown in FIG. 2, and has already filed a separate application (Practical application No. 3-29904). is doing.

The device has a nozzle block 2 having a nozzle 3 for causing a swirling air flow to act on a fiber bundle exiting a draft device, a fiber bundle passage 8, and a spindle rotated by a driving device such as a rotating roller 7. 6 (which may not be rotated), the guide member support 4 fixed in the nozzle block 2, and the guide member 5 attached to the guide member support 4 that projects toward the spindle inlet 6a with its tip end. It will be.

[0004]

[Problems to be solved by the device]

 The above-mentioned conventional spinning device has a problem in that a large amount of cotton dust is discharged from the air escape hole 15 together with the air flow. The cotton drop rate, that is, the ratio of cotton fly to the supplied fiber is as high as 8 to 15%, which is uneconomical.

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 object, a spinning device of the present invention comprises a nozzle block having a nozzle that causes a swirling air flow to act on a fiber bundle that has exited a draft device, a spindle that has a fiber bundle passage, and a spindle that is stationary or stationary. The guide member is provided in the block and protrudes toward the spindle inlet with its tip end, and the airflow restricting bush having a narrowed portion with an inner diameter smaller than the inner diameter is provided downstream of the passage of the swirling airflow along the spindle. ..

[0007]

[Work]

 In the spinning device configured as described above, the fiber bundle exiting the draft device is drawn into the device by the action of the air flow ejected from the nozzle, and the front ends of all the fibers in the fiber bundle are surrounded by the guide member. From there, it is drawn into the fiber bundle that is being formed into yarn and guided into the spindle. The rear end side of the fiber is reversed from the spindle inlet and separated into each fiber. The separated fibers at the rear end are exposed to the swirling airflow ejected from the nozzle, and as the yarn travels, they are spirally wrapped around the fiber bundle that is being formed into yarn and become spun yarn with a real twist. . In the manufacturing process of this spun yarn, the swirling airflow is throttled by the narrowed portion of the airflow restricting bush, the axial flow velocity decreases, the relative circumferential flow velocity increases, and the swirling airflow flows out. Cotton is reduced.

[0008]

【Example】

An embodiment of the spinning device of the present invention will be described with reference to FIG.

This spinning device is arranged next to a draft part including a back roller, a middle roller having an apron, and a front roller, and is provided inside a casing 1 with a nozzle block 2 having a nozzle 3, and a nozzle block 2 thereof. It comprises a guide member support 4 fixed inside and having a guide member 5, a rotary spindle 6 whose inlet side is inserted into the casing 1, and an airflow restricting bush 17 for restricting the airflow ejected from the nozzle 3.

The spindle 6 is circumscribed by three rollers 7 (one of which is on the front side of FIG. 1 and not shown) and is circumscribed. One of them is a drive roller, which can obtain 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 8 is formed through the center of the spindle 6, and the center of the passage 8 and the respective centers of the casing 1 are located on the same straight line that coincides with the traveling path of the fiber bundle. .. 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.

A nozzle block 2 is fitted on the inlet side of the casing 1, and a fiber bundle passage 10 is formed through the inside of the nozzle block 2 on the inlet side. The fiber bundle passage 10 is narrowed in the middle by the taper portion 2a. The portion that covers the spindle conical portion 6b is a tapered portion 2b that opens in a trumpet shape along the outer diameter of the spindle conical portion 6b, and is connected to the fiber bundle passage 10 on the inlet side between the spindle conical portion 6b and the taper portion 2b. An annular space 9 is formed.

Inside the casing 1, a hollow air reservoir 11 is formed between the casing 1 and the nozzle block 2. The nozzle block 2 is formed with four air jet nozzles 3 which are in communication with the air reservoir 11 and face downstream slightly away from the spindle inlet 6a and which are tangential to the fiber bundle passage 10. An air hose 13 is connected to the air reservoir 11 through a hole 12. The direction of the nozzle 3 is set to be the same as the rotation direction of the spindle 6.

On the downstream side of the annular space 9 of the casing 1, 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.

The compressed air supplied from the hose 13 flows into the air reservoir 11 and then is ejected from the nozzle 3 into the annular space 9 of the casing 1 to generate a high-speed swirling airflow in the vicinity of the spindle inlet 6a. This air flow, after swirling inside the annular space 9, is guided from the hollow chamber 14 to the escape hole 15 and discharged. At the same time, this air flow creates a suction air flow which flows into the hollow part of the casing 1 from the nip point of the front roller.

An airflow restricting bush 17 having a narrowed portion 17a having an inner diameter smaller than the inner diameter of the outlet portion of the nozzle block 2 on the outlet side is provided between the casing 1 and the outlet side of the nozzle block 2. Since the inner diameter of the space 9 is reduced due to the presence of the narrowed portion 17a, the flow of air ejected from the nozzle 3 is narrowed, the flow velocity in the axial direction is reduced, and the flow velocity in the circumferential direction is relatively increased. .. As a result, it is possible to keep the cotton drop rate in the range of 1.2 to 4% while maintaining the strength of the spun yarn produced. If a plurality of airflow restricting bushes 17 having various axial lengths and inner diameters of the narrowed portions 17a are prepared, the optimum one according to the type of fiber can be used.

The guide member support 4 has a columnar shape with a conical portion 4 a protruding at one end, and one side thereof is cut out to form a gap 16 with the nozzle block 2 so as to form a guide passage for 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 8 of the spindle 6, and the pin-shaped guide member 5 is inserted into the fine hole.

The guide member 5 protrudes from the pores of the guide member support 4 and has its tip free, and faces the spindle inlet 6a. Its diameter is smaller than the passage diameter of the spindle inlet 6a, and the tip is formed with a smooth curve.

The tip of the guide member 5 is shown in the figure at a position slightly entering the inside of the passage 8 from the spindle inlet 6a, and this state is the most preferable, and the yarn to be produced is also the most ring yarn. It has a similar appearance. However, depending on the conditions, it is possible to take a 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 the front roller of the draft device is removed from the gap 16 between the nozzle block 2 and the guide member support body 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 this time, the guide member 5 functions as a so-called pseudo core that prevents the propagation of twist in the yarn forming process or temporarily substitutes for the central fiber bundle, and is remarkably present in the conventional air-bonded spun yarn. It functions to prevent the formation of untwisted core fiber bundles and to form the yarn from the wound fibers. In the manufacturing process of this spun yarn, the swirling airflow ejected from the nozzle 3 is narrowed by the narrowed portion 17a of the airflow restricting bush 17, the axial flow velocity decreases, and the circumferential flow velocity relatively increases, The flies that flow out with the swirling airflow are reduced.

Although the example of rotating the spindle 6 has been described above, the spindle 6 serves to help twist the yarn, and since the spindle 6 can be manufactured depending on the yarn without rotation, the spindle 6 is It 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, it is possible to manufacture a yarn that has an extremely large amount of wound fiber and is comparable to the ring yarn in terms of appearance and tenacity characteristics, and of course, the inner diameter smaller than the inner diameter of the swirling airflow passage along the spindle. Since the airflow restricting bush having the narrowed portion is provided, the cotton drop rate can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a spinning device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Nozzle block 3 Nozzle 4 Guide member support 5 Guide member 6 Spindle 6a Spindle inlet 17 Airflow restricting bush 17a Constriction part of airflow restricting bush

Claims (1)

Claims for utility model registration: 1. A nozzle block having a nozzle for causing a swirling air flow to act on a fiber bundle exiting a draft device; a rotating or stationary spindle having a fiber bundle passage; and a nozzle block provided in the nozzle block. A spinning device comprising a guide member protruding toward the spindle inlet with its tip directed, and an airflow restricting bush provided downstream of the passage of the swirling airflow along the spindle and having a narrowed portion with an inner diameter smaller than the inner diameter.