JP2000119919A - Draft apparatus for spinning machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject draft apparatus so designed as to set up a sliver suction element in the vicinity of the top roller of front rollers so as to prevent slivers from clogging, enable stable spinning conditions to be maintained, and thereby improve operating efficiency. SOLUTION: This draft apparatus D for a spinning machine which produces spun yarns Y by feeding a spinning section Sp with drafted slivers L is made up of a plurality of roller pairs and so designed as to furnish the vicinity of the top roller Rf1 of front rollers Rf with a suction element 1 for sucking slivers L fed from the front rollers Rf when the conveyance of the slivers L to the spinning section Sp is hampered; wherein it is preferable that the suction element 1 has a rectangular or ellipsoidal suction port with approximately the same width as that of the front top roller Rf1 and is set up in close proximity to the upper part before the exit of the front roller Rf.

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 a spinning machine or the like, and more particularly to a draft device suitably used for an air spinning machine that spins by blowing compressed air from a spinning nozzle. is there.

[0002]

2. Description of the Related Art Conventionally, in a spinning machine for producing a spun yarn by utilizing a swirling flow of a spinning nozzle, when a yarn breakage occurs and a part of yarn waste is clogged in the nozzle portion, the spinning including the spinning nozzle is performed. There is a problem that the conveyance of the sliver to the spinning section is hindered, and the sliver accumulates between the exit of the front roller and the spinning section, damaging the front top roller having the rubber outer layer.

[0003]

In a conventional pneumatic spinning machine, even if an abnormality of the spinning section such as a nozzle clogging occurs and the conveyance of the sliver drafted and sent out to the spinning section is obstructed, the sliver clogging is prevented. The purpose is to provide a draft device that does not occur.

[0004]

According to an aspect of the present invention, there is provided a drafting device for a spinning machine for producing a spun yarn by supplying a drafted sliver to a spinning unit, The draft device is composed of a plurality of roller pairs and, near the top roller of the front roller, a suction member that suctions the sliver sent out from the front roller when the conveyance of the sliver to the spinning unit is hindered is disposed. It is characterized by the following. Therefore, all the slivers that are not introduced into the spinning section are sucked by the suction member, so that the sliver is not clogged between the outlet of the front roller and the spinning section.

According to the second aspect of the present invention, the suction member has a rectangular or elliptical suction port having a width substantially equal to the width of the front top roller, and is disposed near the front upper portion of the front roller outlet. It is characterized by having. Therefore, even the sliver conveyed over the entire width of the top roller can be reliably sucked.

According to the third aspect of the present invention, the suction member sucks the fiber wound up with the rotation of the front top roller during normal spinning at a position near the nip point of the pair of upper and lower front rollers, and sends the fiber to the spinning section. The sliver to be conveyed is disposed at a position where it is not sucked. Therefore, the suction member sucks the wrap fiber wound on the front top roller during normal spinning, and sucks the sliver sent out from the front roller at the time of yarn breakage. It is not effective, but also works during normal spinning, and the suction member can be used effectively.

According to a fourth aspect of the present invention, the spinning section is a spinning section for producing a spun yarn by twisting a sliver by a swirling flow generated by ejecting compressed air from a plurality of nozzles. . Therefore, even if the nozzle clogging peculiar to the air spinning machine that performs the spinning using the compressed air from the nozzle occurs, the sliver sent from the front roller is clogged and the front top roller having the rubber outer layer is damaged. Is gone.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is a side view of a spinning unit according to the present invention. FIG. 2 is a perspective view of a portion where the suction member according to the present invention is provided. FIG. 3 is a front view showing an entire spinning machine having a draft device to which the present invention is applied.

First, a pneumatic spinning machine to which the present invention is applied will be described. As shown in FIG. 3, the present spinning machine has a configuration in which a large number of spinning units U are arranged. After a sliver L is sent to a draft device D and formed into a spun yarn Y by a spinning section Sp, the spun yarn Y Y is taken up by a take-up unit W via a nip roller Rn and a slab catcher Z.
P is a piecing device that performs piecing, and is configured to run below the inside of the spinning machine along the longitudinal direction of the spinning machine.

A process until the sliver L becomes the spun yarn Y and is formed on the package 5 will be described with reference to FIG. The draft device D includes a back roller Rb, a third roller Rt,
This is a so-called 4-wire draft device including a second roller Rs having an apron and a front roller Rf, each of which includes a pair of rollers. The drafting device D is a device for extending a sliver L supplied through a sliver guide T to a predetermined fineness, and performs drafting by gradually increasing the rotation speed of each roller. The sliver L drafted to a predetermined thickness is supplied to a spinning unit Sp including a spinning nozzle N and a spindle member S including a hollow spindle 4, and is formed into a spun yarn Y in the spinning unit Sp. The spindle member S is held by a support member h at the tip of a rod r of the cylinder Cs, and is configured to be separable from the spinning nozzle N as described later.

The hollow spindle 4 has a hollow portion serving as a yarn passage, and the spinning nozzle N has a plurality of air injection holes n. The spun yarn Y is formed by a swirling flow generated by injecting compressed air from the injection hole n toward the distal end of the hollow spindle 4, but will not be described in detail here.

The upper roller constituting the front roller Rf is called a front top roller Rf1. The suction member 1 is disposed above the front top roller Rf1 in the sliver advancing direction. The suction member 1 is connected to a suction source such as a blower (not shown) through the inside of the cradle K as shown in FIG. 2, and includes a cylindrical portion 2 protruding from a side wall of the cradle K in parallel with the top roller. The cylindrical part 2
And a rectangular portion 3 extending downward from the bottom. The width 3a of the rectangular portion 3 is designed to be substantially equal to the width of the front top roller Rf1. This is for surely sucking the sliver sent from any position of the front roller. Therefore, when the width of the sliver to be sent out is narrow, it is not necessary to make the sliver wide and a simple circular pipe-shaped suction member is sufficient.

It is more effective that the front end opening 3b of the rectangular portion 3 is formed in a slope so as to face the front top roller Rf1. This makes it possible to install the tip opening 3b closer to the top roller surface,
The suction effect also increases. Further, it is advantageous that the installation position is as close as possible to the nip point NP of the upper and lower rollers, but it is necessary not to suck the sliver conveyed to the spinning unit during normal spinning. It was found that the effect was exhibited at the position as shown in FIG.

Usually, in the spinning unit U in which the yarn has broken, the supply of the sliver L is stopped by the rotation of the clutch Ch of the back roller Rb being stopped, but when the nozzle is clogged and the yarn breaks, Even when the back roller is stopped, the sliver in the portion from the outlet of the back roller to the spinning unit Sp is clogged as it is between the outlet of the front roller and the spinning unit. In recent spinning machines, a suction member Ku is provided below the front bottom roller Rf2 to suck the parent yarn Ya pulled out from the package 5 at the time of splicing and to remove the fiber following the rotation of the bottom roller. And the like, but only when the amount of sliver sent from the front roller is small. For this reason, when the amount of sliver clogged is large, the front top roller Rf1 during rotation is continued.
In some cases, a large mass was formed until the rubber outer layer portion, which is the outer layer surface of the top roller, was damaged.

Since the front bottom roller Rf2 is a metal roller and the front top roller Rf1 is a rubber roller, the sliver sent from the front roller Rf is sent to the upper part in the rotation direction of the front top roller Rf1 together with the rotation of the front top roller Rf1. Tend. Recent high-speed spinning machines perform high-speed spinning at speeds exceeding 300 m / min, and as a result, the tendency of the front top roller Rf1 to be wound up in the rotational direction has become remarkable.

If fiber waste or lump is clogged at the inlet of the spinning nozzle N, it becomes impossible to introduce a sliver. In addition, if an abnormality occurs in the compressed air transport path and the blowing from the nozzles stops, it becomes impossible to introduce the sliver. When such an abnormality occurs in the spinning unit Sp and the feeding of the sliver is hindered, the sliver tries to escape to the upper part in the rotation direction of the front top roller Rf1. When the suction member 1 is disposed at this position, the sliver sent out from the front roller Rf can be reliably sucked, so that the sliver can be prevented from being clogged between the outlet of the front roller and the spinning unit. Became.

Since the suction member 1 is always in a suction state during spinning, the wrap fiber which is to be wound around the front top roller Rf1 during spinning can also be removed by suction.
Stable spinning operation has become possible.

[0018]

As described above, according to the present invention,
Even if an abnormality such as nozzle clogging occurs in the spinning unit in the air spinning machine and the conveyance of the sliver to the spinning unit is hindered, the sliver is sent out from the front roller because the suction member is disposed near the front roller outlet. The sliver can be sucked, so that the sliver can be prevented from being clogged between the outlet of the front roller and the spinning unit. Further, the wrap fiber of the front top roller during spinning is also removed by suction, so that a stable spinning state can be maintained.

[Brief description of the drawings]

FIG. 1 is a side view of a spinning unit according to the present invention.

FIG. 2 is a perspective view of a portion where a suction member according to the present invention is provided.

FIG. 3 is a front view showing an entire spinning machine having a draft device to which the present invention is applied.

[Explanation of symbols]

 Reference Signs List 1 suction member D draft device Rf front roller Rf1 front top roller Rf2 front bottom roller Sp spinning section N spinning nozzle D draft device P piecing device L sliver Y spun yarn

Claims (4)

[Claims] 1. A drafting device for a spinning machine for producing a spun yarn by supplying a drafted sliver to a spinning section,
The draft device is composed of a plurality of roller pairs and, near the top roller of the front roller, a suction member that suctions the sliver sent out from the front roller when the conveyance of the sliver to the spinning unit is hindered is disposed. A drafting device for a spinning machine. 2. The suction member according to claim 1, wherein the suction member has a rectangular or elliptical suction port having substantially the same width as the width of the front top roller, and is disposed close to a front upper portion of a front roller outlet. The drafting device for a spinning machine according to claim 1. 3. A sliver which is drawn at a position near a nip point of a pair of upper and lower front rollers during normal spinning with the rotation of the front top roller and conveyed to the spinning section. 3. The drafting device for a spinning machine according to claim 1, wherein the drafting device is disposed at a position where the drafting does not occur. 4. The spinning unit according to claim 1, wherein the spinning unit is a spinning unit that twists a sliver by a swirling flow generated by ejecting compressed air from a plurality of nozzles to produce a spun yarn. Draft device for spinning machine.