JPH0637370U - Draft device - Google Patents

Abstract

(57) [Summary] [Purpose] To permanently prevent static electricity from being generated on each top roller and apron of the draft device, and to prevent fly dust from adhering to the draft device. [Structure] At least above the top apron 22a behind the front top roller 20a and above the top apron 22a, static electricity removing means 25
Distribute.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a roller-type draft device for a spinning device, which stretches and thins a fiber bundle.

[0002]

[Prior art]

 The applicant of the present invention has developed a pneumatic spinning device that has a hollow spindle and a guide member that projects toward the entrance of the hollow spindle, and jets a swirling air current toward the spindle entrance to twist the fiber bundle that has exited the draft device. Although it is being developed, the usual roller type draft device used in ring spinning machines and the like is used as the draft device.

[0003]

[Problems to be solved by the device]

 The roller draft device used in the pneumatic spinning device rotates at a fairly high speed, and when the draft device rotates at high speed, static electricity is generated on the rubber roller and apron that make up the top roller (the peripheral speed of the front roller is The static electricity generated on the top rollers of the front roller, the second roller, the third roller and the back roller when operating at 250 m / min is -100V, -75V, -50V, 0V, respectively. It is easy for dust to collect above the top apron behind the top roller. The cotton wool collected there is caught in the front roller and mixed into the yarn, which deteriorates the yarn quality and, in the worst case, causes yarn breakage. In particular, in the draft device of the pneumatic spinning device, it may enter the spindle or the nozzle inlet and become clogged.

Conventionally, in order to prevent the generation of static electricity, a rubber roller or an apron has also been subjected to a surface treatment. However, the effect of the surface treatment gradually diminishes with the lapse of time, and the static electricity is gradually charged. The amount is increasing.

The present invention is intended to permanently prevent static electricity from being generated in each top roller and apron of the draft device, and to prevent fly cotton from adhering to the draft device.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the draft device of the present invention has static electricity removing means arranged at least above the top apron behind the front top roller.

[0007]

[Work]

 In the drafting device configured as described above, the fiber bundle to be fed is drafted in the usual manner by the difference in the rotating surface speed of each roller. Then, the static electricity generated in each top roller and apron is immediately removed by the static electricity removing means, and the charge amount is always zero.

[0008]

【Example】

 Prior to the description of the draft device of the present invention, the pneumatic spinning device S in which the fly dust attached to the draft device is a problem will be described with reference to FIG.

The pneumatic spinning device includes a nozzle block 2 having a nozzle 3 disposed inside a casing 1, a guide member support 4 fixed inside the casing and having a guide member 5, and an inlet side inserted into the casing 1. It is composed of a rotary spindle 6 which is mounted.

The spindle 6 is circumscribed by three rollers 7, 8 and 9 (the roller 9 is on the front side of FIG. 3 and is not shown) and is circumscribed externally, one of which is a drive shaft. It's a roller. A fiber bundle passage 10 is formed through the center of the spindle 6, the outer diameter of the inlet 6a is sufficiently small, and the portion following the inlet 6a is a conical portion 6b whose outer diameter increases toward the downstream side. .

A portion of the casing 1 that covers the spindle 6 has a hollow chamber 12 of a small diameter cylindrical shape formed by a bush 11 in the vicinity of the spindle inlet 6a. The portion following the hollow chamber 12 is a conical hollow portion opened at a large angle. It is room 13. The front of the small-diameter hollow chamber 12 is formed by the nozzle block 2 into a cylindrical shape having a diameter slightly larger than the tip diameter of the spindle 6. In front of the conical hollow chamber 13, an annular hollow chamber 14 and a tangential air escape hole 15 following it are formed.

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.

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 inside the hollow chamber 12, this airflow diffuses outward while swirling inside 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 cylindrical 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 protrudes from the pores of the guide member support 4 and has its tip free, and faces the inlet 6 a of the spindle 6.

In the spinning system configured as described above, the fiber bundle drafted by the draft device is moved from the gap 19 between the nozzle block 2 and the guide member support 4 to the casing by the action of the air flow ejected from the nozzle 3. 1, the front ends of all the fibers of the fiber bundle are drawn from around the guide member 5 into the fiber bundle being formed into a yarn and guided into the spindle. Further, the rear end side of the fiber is reversed 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 a real twisted spun yarn. Become. The guide member 5 functions as a so-called pseudo core, which blocks the propagation of twist in the yarn forming process or temporarily serves as a substitute for the central fiber bundle, and remarkably appears in a 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.

Next, the draft device of the present invention will be described with reference to FIGS. 1 and 2.

This draft device is, for example, a static draft remover as shown in FIG. 2 as an example in a key part of a roller type draft device including a front roller 20, a second roller 21 having an apron 22, a third roller 23 and a back roller 24. Means 25 are provided.

The static electricity removing means 25 needs to be provided at least above the top apron 22a behind the front top roller 20a. In addition, it may be provided below the bottom apron 22b behind the front bottom roller 20b and behind the third top roller 23a. In any of the installation locations, it is desirable that the static electricity removing means 25 is installed with a gap of about 5 mm without contacting the rollers and the apron so that the cotton dust does not adhere to the static electricity removing means 25. Thus, even if the static electricity removing means 25 is installed away from the roller and the apron, the static electricity generated is immediately removed by the corona discharge to the static electricity removing means 25.

The static electricity removing unit 25 may be any one capable of removing static electricity, such as a brush made of carbon fiber or fine metal wire, but the one shown in FIG. 2 has a tuft 25a at one side edge. It is a cloth strip in which the conductive fibers 25b are folded at appropriate intervals. It is necessary to ground any static electricity removing means 25.

When the sliver fiber bundle is supplied from the back roller 24 side of the drafting device configured as described above, the fiber bundle is normally drafted due to the difference in the rotating surface speed of each roller. Then, the static electricity generated in each top roller and apron is immediately discharged to the static electricity removing means 25 to be removed, and the charge amount in each roller and apron is always zero. Therefore, there is visibly less fouling build-up on the draft device.

[0022]

[Effect of device]

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

That is, it is possible to permanently prevent static electricity from being generated in each of the top rollers and the apron, and it is possible to reliably prevent fly dust from adhering to the draft device that rotates at a high speed. Therefore, the yarn unevenness of the spun yarn is reduced, and it is possible to prevent deterioration of the yarn quality, yarn breakage, and adverse effects on the spinning device.

[Brief description of drawings]

FIG. 1 is a side view of a draft device of the present invention.

FIG. 2 is a plan view of static electricity removing means.

FIG. 3 is a cross-sectional view of a pneumatic spinning device.

[Explanation of symbols]

 20 front roller 20a front top roller 21 second roller 22 apron 22a top apron 25 static electricity removing means

Claims (1)

[Scope of utility model registration request] 1. A drafting device in which static electricity removing means is disposed above at least a top apron behind a front top roller.