JP3295873B2 - Draft device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a draft device for drafting slivers, and more particularly to a draft device for a high-speed spinning machine.

[0002]

[Prior art and its problems] As a draft device
The configuration described in JP-A-3-29909 is used. In the device of the publication, a sliver passes between a top apron and a bottom apron and is guided to a front roller. The front roller includes a top roller and a bottom roller. The top roller and the bottom roller engage with each other and rotate in opposite directions. Therefore, the sliver can be nipped between the top roller and the bottom roller, and the sliver can be drafted by the top roller and the bottom roller.

Recently, a high-speed spinning machine has been developed by the applicant. For example, in Japanese Patent Application Laid-Open No. 8-209463, after the sliver is drafted, it is guided into an air nozzle, and the yarn is twisted by the air nozzle. Thereafter, the yarn is guided between the pair of twisting rollers, and the yarn is twisted by the twisting roller. Its twisting efficiency is high. As a result, the yarn can be spun at a high speed, and the spinning speed reaches 200 m / min or more.

[0004]

By the way, 200 m /
In the case of a high-speed spinning machine having a spinning speed of min or more, in the draft device, when the sliver passes between the top apron and the bottom apron and is guided to the front roller, the diffusion of the fiber bundle is caused by the accompanying airflow to the nip point of the front roller. And the spinning uniformity tends to deteriorate. Therefore, it is preferable that the tip of the bottom apron is brought close to the top roller of the front roller to minimize the gap between them, thereby reducing the diffusion of the fiber bundle and improving the uniformity of spinning. However, if the gap between the tip of the bottom apron and the top roller is made unnecessarily small, the trailing end of the fiber is pulled out from between the top apron and the bottom apron, and when bouncing, it collides with the top roller and the top of the fiber by the trailing end of the fiber. Rollers are easily damaged.
For this reason, there is a problem that the top roller must be replaced early.

Accordingly, an object of the present invention is to reduce the diffusion of the fiber bundle in the draft device, improve the uniformity of spinning, and prevent the top roller of the front roller from being damaged.

[0006]

Means for Solving the Problems To achieve the above object,
Therefore, the present invention provides a high-speed sliver drafting and spinning machine.
On a high speed spinning machine, attach the tip of the bottom apron to the front
Close to the top roller of the bottom apron.
0.5 to 1.5 mm gap between the tip and the top roller
This is a draft device.

The gap between the tip of the bottom apron and the top roller is preferably 0.5 to 1.5 mm.

According to the present invention, the spinning speed is 200 m / min.
This is effective for the high-speed spinning described above.

[0009]

Embodiments of the present invention will be described below.

In FIG. 1, this is a draft device for drafting a sliver S, which is a so-called three-wire type.
It has a front roller Rf, a second roller Rs, and a back roller Rb. The front roller Rf includes a top roller 1 and a bottom roller 2. As for the second roller Rs, the top apron 3 and the bottom apron 4 are provided around the top roller 5 and the bottom roller 6, and the top apron 3 and the bottom apron 4 are endless belt-shaped, Extend. Further, as shown in FIG. 2, an apron tensioner 7 is inserted at the tip of the top apron 3, and a tensor bar 8 is attached and supported at the tip of the bottom apron 4. The back roller Rb also includes a top roller 9 and a bottom roller 10.

Further, in the back roller Rb, the top roller 9 and the bottom roller 10 are engaged with each other and rotate in opposite directions. As for the second roller Rs, the top roller 5 and the bottom roller 6 are engaged via the top apron 3 and the bottom apron 4 and rotate in opposite directions, and the top apron 3 and the bottom apron 4 are connected to the top roller 5 and the bottom roller 6. Circulates in the opposite direction. The speed is higher than the top roller 9 and the bottom roller 10 of the back roller Rb. Further, the top roller 1 and the bottom roller 2 of the front roller Rf engage with each other and rotate in opposite directions. The speed is faster than the top apron 3 and the bottom apron 4 of the second roller Rs. Then, the sliver S is supplied to the back roller Rb, nipped between the top roller 9 and the bottom roller 10, supplied to the second roller Rb, and nipped between the top roller 5 and the bottom roller 6. Further, the sliver S passes between the top apron 3 and the bottom apron 4 of the second roller Rs, is supplied to the front roller Rf, and is nipped between the top roller 1 and the bottom roller 2. Therefore, the front roller R
f, the sliver S is drafted by the second roller Rs and the back roller Rb.

After the sliver S is drafted, the sliver S is guided into the air nozzle 11, the yarn Y is twisted by the air nozzle 11, and then the yarn Y is guided between the pair of twist rollers 12, and the twist roller 12 The yarn is twisted in the same manner as in the apparatus disclosed in Japanese Patent Application Laid-Open No. 8-209463. Its twisting efficiency is high. As a result, the yarn Y can be spun at a high speed, and the spinning speed reaches 200 m / min or more. Thereafter, the yarn Y passes through the delivery roller 13, is guided to a winding device, and is wound.

Further, as for the second roller Rs of this apparatus, the tip of the bottom apron 4 is
The height of the bottom apron 4 is adjusted at a position higher than the nip point N of the front roller Rf. Therefore, the tip of the bottom apron 4 is close to the top roller 1 of the front roller Rf, and the gap C between the two is 0.5 to 1.
5 mm is selected.

The value of the gap C of 0.5 to 1.5 mm is important. According to an experiment, in a high-speed spinning machine having a spinning speed of 200 m / min or more, when the gap C between the tip of the bottom apron 4 and the top roller 1 is larger than 1.5 mm, the entrainment airflow to the nip point N of the front roller Rf is increased. As a result, the fiber bundle was diffused, and the spinning uniformity was deteriorated. On the other hand, if the gap C is smaller than 0.5 mm, the rear end of the fiber is pulled out from between the top apron 3 and the bottom apron 4, and when the fiber bounces, it collides with the top roller 1 and the rear end of the fiber causes the top roller to move. 1 was damaged. When the gap C between the tip of the bottom apron 4 and the top roller 1 is smaller than 1.5 mm and larger than 0.5 mm, the diffusion of the fiber bundle decreases, the spinning uniformity improves, and the front roller Rf Top roller 1 was not damaged.

Therefore, in this apparatus, the gap C between the tip of the bottom apron 4 and the top roller 1 of the front roller Rf is selected to be 0.5 to 1.5 mm, which accompanies the accompanying airflow to the nip point N of the front roller Rf. The size is selected to be small enough to reduce the diffusion of the fiber bundle and large enough not to damage the top roller 1 due to the trailing end of the fiber pulled out from the top apron 3 and the bottom apron 4 and bouncing. Therefore, even at a spinning speed of 200 m / min or more, the diffusion of the fiber bundle is reduced, the spinning uniformity is improved, and the top roller 1 of the front roller Rf is not damaged.

[0016]

As described above, according to the present invention, in a high-speed spinning machine having a spinning speed of 200 m / min or more, diffusion of fiber bundles is reduced, spinning uniformity is improved, and the front roller Rf Top roller 1 is not damaged,
The intended purpose can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a side view of the draft device of FIG.

[Explanation of symbols]

 S Sliver Rf Front roller 1 Top roller 3 Top apron 4 Bottom apron 11 Air nozzle 12 Twisted roller N Nip point C Gap

Claims (3)

(57) [Claims] 1. The sliver is a second roller top engine.
And between the bottom apron and the front roller
Nip between the top roller and bottom roller
In Rontorora and high speed spinning machine for performing spinning and drafting the sliver by the second roller, the SECA
A tip end of a bottom apron of the roller and a top roller of a front roller, and a gap between the tip of the bottom apron and the top roller is set to 0.5 to 1.5 mm. 2. The spinning speed of the high-speed spinning machine is 200 m / m.
The draft device according to claim 1, wherein the draft is not less than “in”. 3. The drafting device according to claim 1, wherein the drafting device is a drafting device for a high-speed spinning machine that twists a yarn by an air nozzle and a twisting roller after drafting the sliver.