JPH1143829A - Piecing in spinning machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve operation stability by carrying out efficiently piecing in a spinning machine by sufficiently strengthening the yarn strength even in a case of a fiber having low friction coefficient such as wool fiber by imparting water to a piecing part when piecing. SOLUTION: This method for piecing in an air spinning machine having a spinning part comprising a hollow spindle 4 and a spinning nozzle N comprises imparting water to the piecing part or imparting the water with an antislipping agent and antistatic agent thereto when carrying out the piecing in the spinning machine comprising a step for introducing a parent yarn Ya to the spinning part, a step for piecing a drafted and sent-out sliver with the parent yarn Ya by a rotational flow from the spinning nozzle N, and a step for successively starting the spinning. For imparting the water, the water is preferably mixed with the compressed air used for introducing the parent yarn Ya to the spinning part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piecing method for a pneumatic spinning machine, and more particularly to a method for increasing yarn strength at a piecing portion.

[0002]

2. Description of the Related Art Conventionally, in a spinning apparatus for producing a spun yarn by utilizing a swirling flow of a spinning nozzle, when a spun yarn is cut, a yarn on a take-up side unwound from a seed yarn or a package of a take-up unit is cut. A piecing method is known in which a parent yarn is introduced into a spinning section to restart sliver supply, and a sliver fiber is wound around a seed yarn or a parent yarn in the spinning section to restart spinning.

[0003]

The yarn strength at the spliced portion when piecing (piecing) by the conventional piecing method is 80 to 90 times that of the parent yarn in the case of spun yarn containing 100% cotton or ester cotton. % Yarn strength was obtained, and piecing was performed without any problem. Recently, a spinning test was conducted on various fiber materials, and the yarn strength of the spliced portion obtained by the same piecing method when spinning wool short fibers was only about 50% of the parent yarn. Was.

When the cause was examined, the wool fiber had a low coefficient of friction between the wool fibers. When the sliver fiber was wound around the parent yarn unwound from the winding package by the swirling flow of the spinning nozzle, It was found that the winding force was weak and the yarn strength at the spliced portion did not increase.

[0005] The present invention solves the problems of the conventional piecing method and provides a piecing method in which the yarn strength at the piecing portion is sufficiently high even for fibers having a low friction coefficient such as wool fibers. The purpose is.

[0006]

According to a first aspect of the present invention, in a pneumatic spinning machine having a spinning section including a hollow spindle and a spinning nozzle, a parent yarn is introduced into a spinning section. The sliver that is drafted and sent out and the parent yarn are pierced by a swirling flow of a spinning nozzle, and water is imparted to the yarn splicing portion when splicing a spinning machine that continuously starts spinning. The point is to do. Accordingly, in the piecing portion where the sliver fiber is wound around the parent yarn, the coefficient of friction between the fibers is increased and the yarn strength is increased at the piecing portion by firmly winding the fiber. In the invention of claim 2, the gist is that moisture is mixed in the compressed air used when introducing the parent yarn into the spinning section. Therefore, it is possible to easily add moisture to the parent yarn simply by adding moisture to the compressed air used when introducing the parent yarn unwound from the winding package into the hollow spindle. The gist of the third aspect is that a lubricant is added to the water. Therefore, the addition of a lubricant that increases the frictional force as well as the addition of moisture further increases the frictional force between the fibers and stabilizes the yarn strength at the spliced portion. In the invention of claim 4, the gist is that an antistatic agent is added to the water. Therefore, when the easily-charged fibers are pierced, the entanglement between the fibers is improved, and the yarn strength is increased.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One 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, showing a state where a parent yarn is introduced into a hollow spindle during piecing. FIG. 2 is a side view of the spinning section and the draft section according to the present invention, and shows a state in which the parent yarn is sent out before the nozzle member by blowing compressed air after the introduction of the hollow spindle of the parent yarn. FIG. 3 is a side view showing a second embodiment of the hollow spindle. FIG. 4 is a side view illustrating the piecing operation of the piecing apparatus to which the present invention is applied. FIG. 5 is a front view showing one spinning unit. FIG. 6 is a perspective view showing a state where the suction mouth sucks the yarn end and returns to the standby position at the time of piecing. FIG. 7 shows a piecing time chart according to the present invention. FIG. 8 is a front view showing an entire spinning machine having a piecing 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. 8, the 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 section 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 fineness 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 the 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.

Next, the piecing device P traveling along the longitudinal direction of the spinning machine in which a large number of spinning units U having the above-described spinning units Sp are arranged detects the spinning unit U in which the yarn breakage has occurred, and detects the yarn. The piecing method for joining will be described in detail with reference to FIGS.

When a yarn defect is detected by the slab catcher Z, or when the slab catcher Z detects a yarn breakage due to poor spinning, first, the electromagnetic clutch Ch for controlling the driving of the back roller Rb is turned off and the back roller Rb is turned off. The rotation is not transmitted, and the supply of the sliver L is stopped. And, by sensing the signal of the thread break,
The piecing device P running in the machine stand stops at the spinning unit U where the yarn break has occurred, and performs piecing (yarn splicing).

[0013] The spinning unit U having the broken yarn is sliver L
Is stopped, the spindle member S including the hollow spindle 4 is separated from the spinning nozzle N by the cylinder Cs, and the package 5 held on the cradle arm 6 rotatable around the shaft 8 is moved from the winding drum 7. Although it is separated and in a standby state, its mechanism will not be described in detail here. Further, the nip roller Rn for feeding the spun yarn from the spinning unit Sp to the winding unit is configured to be able to contact and separate from the delivery roller Rd, but is normally in contact with the nip roller Rn, and is attached to the piecing device P during piecing. The contact-separation control is performed mechanically by a lever device.

The piecing device P is driven by drive wheels 14 on a rail 13 passed over a frame 12 below the spinning machine, and has two rotatable guide rollers 1.
5a and 15b are guide rails 1 installed on a spinning machine main body.
6 and the piecing device P
Maintain a stable posture. The piecing device P
A package pushing member J for separating the package 5 from the winding drum 7 to rewind the spun yarn Y wound into the package 5 from the package 5 of the spinning unit in which the yarn breakage has occurred, and for holding the package 5 at that position. A reversing roller Rw for reversing the package 5 separated from the winding drum 7 in a direction opposite to the winding direction, and a suction member S for extracting the yarn end of the spun yarn Y from the package 5
u, the spun yarn Y drawn from the package 5 is used as the parent yarn Ya.
Transfer arm member Ta which is held at a predetermined position and transferred to the rear end of the hollow spindle 4 of the spinning unit Sp.
And an air sucker member As for threading the parent yarn Ya through the hollow fiber passage of the hollow spindle 4. Some of the air soccer members As are provided with a defibration tube for defibrating the leading end of the parent yarn Ya threaded through the hollow spindle 4, and can be selected as needed.

In the piecing operation by the piecing device P, first, the package pushing member J is brought into contact with the package 5 by the cam mechanism of the piecing device body (not shown) to position the package 5. Then, the yarn end suction mouth 17 constituting the suction device Su rotates and approaches the package 5, and the reverse rotation roller Rw rotates the package 5 in the spun yarn unwinding direction and the yarn is broken and wound. Suction the yarn end. As shown in FIG. 6, the suction mouth 17 has a suction slit 17a having a length substantially equal to the width of the package 5 at a tip end thereof, and the yarn end can be sucked by suction from a blower (not shown). ing.

As shown in FIG. 6, when the suction mouth 17 that has sucked the yarn end rotates upward and enters a standby state, the sucked yarn end is guided by the guide member Gu and held at a predetermined position. Later, the transfer arm member Ta
Goes to receive the yarn end. The transfer arm member T
When the yarn end is gripped by the drive roller 1 and the driven roller 2 which are a pair of feed rollers R included in the head member k of FIG. 1A, the yarn end is cut by the cutter 18 mounted on the guide member Gu. The length of the yarn end protruding from the feed roller R is made constant. Thereafter, as shown in FIG. 4, the transfer arm member Ta is rotated upward about the fulcrum 9, and the yarn end (parent yarn Ya) is attached to the flared rear end portion 10 of the hollow spindle 4. Is transported.

As shown in FIG. 5, the transfer arm member Ta is composed of a motor m for rotating operation, a cylinder t for reciprocating in the horizontal direction, a connecting operation member q, a connecting member v, a tip head member k, and the like. ing. A detailed description of the mechanism will not be provided here. The positioning of the package 5 by the package pushing member J and the rotation of the yarn end suction mouse 17 are all performed by a cam mechanism built in the piecing device P, but the details thereof will not be described here.

Referring to FIG. 1, the piecing method according to the present invention will be described. The lead yarn Ya gripped by the feed roller R of the tip head member k is guided to the trumpet-shaped rear end portion 10, and the air sucker member As engaged with the tip of the hollow spindle 4 is sucked. The parent yarn Ya is fed forward of the hollow spindle 4 by the yarn feeding by rotation. Thereafter, the air sucker member As descends, and the spindle member S is combined with the spinning nozzle N by the cylinder Cs. Then, by the compressed air injection from the yarn feed nozzle 3 and the yarn feed by the feed roller R, the parent yarn Ya is sent out in front of the spinning nozzle N as shown in FIG. Then, the feed roller R releases the gripping of the thread, and the transfer arm member Ta including the feed roller R returns to the home position.

At the start of spinning, the electromagnetic clutch Ch is first turned on, the back roller Rb starts rotating, and the sliver L is supplied to the draft section. One end of the drafted sliver L is sucked into the suction pipe Ku. Thereafter, the package 5 contacts the winding drum 7 and the spinning nozzle N
When the sliver L sucked by the suction pipe Ku at the time when the compressed air is jetted from the nozzle and the spinning is started, the sliver L is merged with the main yarn Ya and drawn into the spinning unit Sp so that the sliver L is spiced (yarn spliced). Has become.

FIG. 7 shows a time chart at the time of piecing. When the parent yarn Ya is fed forward of the hollow spindle 4 and the spindle member S and the spinning nozzle N are united to prepare for the start of spinning, firstly at time T0, compressed air is injected from the yarn feed nozzle 3 and then slightly. From T1 to T2, the yarn feed by the feed roller R is performed. By this yarn feeding operation, the main yarn Ya is sent out a predetermined length in front of the spinning nozzle N, and the air injection from the nozzle 3 stops at time T3. At this time, the leading end of the main thread Ya is in a state of being sucked by the suction pipe Ku for a predetermined length. Then, at time T4, the driving of the back roller starts, and the sliver L starts to be fed.
, And is sent out from the front roller Rf and is sucked by the suction pipe Ku. By starting the driving of the nip roller Rn at the time T5 at the time of the suction, and simultaneously starting the compressed air injection of the spinning nozzle N, the lead yarn Ya and the drafted sliver L are simultaneously pulled out from the suction pipe Ku. By restarting the spinning, the piecing operation is completed.

The air supplied to the yarn feed nozzle 3 passes through a well-known vaporizer 3b and is supplied by a conduit 3a. For this reason, the supplied air contains mist-like water. When the main yarn Ya is sent out to the front of the spinning nozzle N by the yarn feed nozzle 3, the main yarn Ya is fed.
Will be added with water. In addition, the blowing of air by the nozzle 3 is a short time of 2 to 3 seconds in one piecing, so that the water can be reliably added to the parent yarn Ya and adheres to the hollow spindle 4 and the spinning nozzle N. The amount of water is very small, and it is a very effective method since it dries immediately after the start of spinning.

By the piecing method as described above, the yarn strength at the piecing portion of the wool short fiber was greatly increased. For example, a wool fiber having a fiber length of 1 inch will
In the case of 30 spinning, the yarn strength of the spun yarn was 160 g, and in the conventional piecing method, the yarn strength of the piecing portion was 83 g, but in the piecing method according to the present invention, it was 128 g. Further, when the piezed yarn was left in a dry room for 13 hours and measured, it was found that the yarn had a yarn strength of 125 g and had no practical problem.

When a lubricating agent or an antistatic agent was added to the water of the vaporizer 3b, the entanglement between the fibers was improved, and the yarn strength at the piecing portion tended to increase slightly. . As the lubricant or antistatic agent, an appropriate one corresponding to the fiber material being spun may be selected from commercially available ones.

The spindle member shown in FIG. 3 is a spindle member having a hollow member 4a provided with a porous member 4b for releasing compressed air in a middle portion of the hollow spindle 4a. If this spindle member is used, an air sucker member is not required. The main yarn can be sent out to the front of the spinning nozzle only by blowing compressed air from the yarn feed nozzle 3 and feeding the yarn by the yarn feed roller. That is, if the hollow spindle 4a is used, the air sucker member As is not required, and there is no need to separate the spindle member S from the spinning nozzle N, so that the structure of the spinning section can be simplified. Also in the case of this structure, a spun wool yarn having sufficiently strong yarn strength at the seam could be obtained by adding moisture to the compressed air that carries the parent yarn Ya at the time of splicing.

[0025]

As described above, according to the present invention,
At the time of piecing for splicing of a pneumatic spinning machine, water is added to the parent yarn unwound from the package, so that a fiber having a low coefficient of friction such as wool fiber is drafted onto the parent yarn by a spinning nozzle. The piecing method of performing piecing by winding the sliver wound on the sliver can also obtain a practically sufficient yarn strength at the piecing portion. Furthermore, since the water to be added to the parent yarn is contained in the air of the yarn feed nozzle that sends the parent yarn forward of the spinning nozzle, the water can be reliably and easily added to the parent yarn. In addition, not only by adding moisture, but also by adding a lubricant that increases frictional force,
Further, the frictional force between the fibers became stronger, and the yarn strength at the spliced portion became stable. Further, since the antistatic agent was added to the water, the bad effect of static electricity accumulated on the spun yarn during spinning could be reduced, and the entanglement between fibers became stronger.

[Brief description of the drawings]

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

FIG. 2 is a side view of a spinning section and a draft section according to the present invention.

FIG. 3 is a side view showing a second embodiment of the hollow spindle.

FIG. 4 is a side view illustrating a piecing operation of the piecing apparatus to which the present invention is applied.

FIG. 5 is a front view showing one spinning unit.

FIG. 6 is a perspective view showing a state where a suction mouth sucks a yarn end and returns to a standby position during piecing.

FIG. 7 shows a piecing time chart according to the present invention.

FIG. 8 is a front view showing the entire spinning machine having a piecing device to which the present invention is applied.

[Explanation of symbols]

 Reference Signs List 3 yarn feed nozzle 3b vaporizer 4, 4a hollow spindle S spindle member Sp spinning section N spinning nozzle D drafting device P piecing device L sliver Y spun yarn Ya parent yarn

Claims (4)

[Claims] In a pneumatic spinning machine having a spinning section including a hollow spindle and a spinning nozzle, a parent yarn is introduced into a spinning section, and a sliver that is drafted and sent out and the parent yarn are turned. A piecing method for a spinning machine, characterized in that at the time of piecing of a spinning machine that starts piecing in a flow and continuously starts spinning, water is applied to the piecing part. 2. The piecing method for a spinning machine according to claim 1, wherein water is mixed into compressed air used when introducing the parent yarn into the spinning section in order to provide the water. 3. The piecing method for a spinning machine according to claim 1, wherein a lubricating agent is mixed into the water. 4. The piecing method for a spinning machine according to claim 1, wherein an antistatic agent is mixed in the water.