JP2000080529A - Threading - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a threading method, capable of surely piecing without causing the clogging of a parent yarn in a spindle by once stopping feeding rollers in the middle of a threading operation, jetting air from a spinning nozzle for a prescribed time, and subsequently restarting the threading operation to thread the yarn. SOLUTION: This method for threading comprises once stopping feeding rollers R in the middle of a threading operation, jetting air from a spinning nozzle N for a prescribed time, and subsequently restarting the threading operation. Therein, a spindle portion S is approachably or separably disposed between a spinning position approaching the spinning nozzle portion N and a waiting position apart from the spinning nozzle portion N. It is preferable that the jetting of air from the spinning nozzle portion N for the prescribed time is carried out, when the spindle portion S separated on the start of the piecing is rejoined to the spinning nozzle N. The jetting of air from the spinning nozzle is intermittently carried out.

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.
The present invention relates to a threading method for supplying a package side parent yarn to a spinning unit.

[0002]

2. Description of the Related Art Conventionally, in a spinning apparatus for producing a spun yarn using a swirling flow of a spinning nozzle, when a spun yarn is cut, a winding side unwound from a seed yarn or a package of a winding section. A piecing method is known in which the parent yarn is introduced into a spinning section to restart sliver supply, and sliver fibers are wound around a seed yarn or a parent yarn in the spinning section to restart spinning. (JP-A-6-173130)

[0003] In the above-mentioned conventional example, when the spun yarn unwound from the package is used as a parent yarn to run backward in the spindle portion, a pair of feed rollers holding the parent yarn move to the rear portion of the spindle portion. In addition to the yarn feeding, the yarn feeding of the parent yarn is performed by a suction member fitted to the tip of the spindle portion and sucking. However, recently, a method of feeding a parent yarn using a yarn feed nozzle without using a suction member in front of a spindle has been studied.

[0004]

When the parent yarn is conveyed in the spindle portion by air injection from a yarn feed nozzle,
If the leading end of the main thread is loose, there is a problem that the fine inner diameter of the spindle portion is jammed.

SUMMARY OF THE INVENTION The present invention solves the problems of the conventional piecing method in which a parent yarn is conveyed by using a yarn feed nozzle, and a yarn threading method capable of surely splicing a parent yarn without clogging a spindle portion. It is intended to provide.

[0006]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, at the time of piecing of spliced spun yarn, the parent yarn on the package side is caused to run backward in the spindle portion. In the threading method performed by a pair of feed rollers and air injection from the yarn feed nozzle when transferring to the spinning section, the feed roller is temporarily stopped during the threading and air injection from the spinning nozzle section is performed for a predetermined time. After that, the threading operation is restarted. Therefore, even if the lead yarn is stuck in the spindle part,
Since air is injected from the spinning nozzle for a predetermined time, the suction force acts in a direction to discharge the clogged parent yarn to the outside, thereby eliminating the yarn clogging. In the invention according to claim 2, the spinning section includes a spinning nozzle section and a spindle section, and the spindle section has a spinning position close to the spinning nozzle section and a standby position separated from the spinning nozzle section. The jetting of air from the spinning nozzle portion performed for the predetermined time is performed when the spindle portion that has been separated at the start of piecing is rejoined with the spinning nozzle portion. . Therefore, as in the case of spinning, air is jetted toward the tip of the spindle, so that an air flow is generated from the inside of the spindle to the outside, and the yarn end clogged in the spindle is reliably discharged to the outside. become. The invention according to claim 3 is characterized in that the air injection from the yarn feed nozzle is performed intermittently. Therefore, when the parent thread is inserted into the spindle portion, the success rate of threading is improved by the air pressure that intermittently pushes out the parent thread even when the parent thread is likely to be clogged.

[0007]

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, showing a state where a parent yarn is introduced into a spindle unit 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 parent yarn is introduced into the spindle portion. FIG. 3 is a side view illustrating the piecing operation of the piecing apparatus to which the present invention is applied. FIG. 4 is a front view showing one spinning unit. FIG. 5 is a perspective view showing a state in which the suction mouth sucks the yarn end and returns to the standby position during piecing. FIG. 6 is a front view showing an entire spinning machine having a piecing device to which the present invention is applied. FIG. 7 is a diagram showing a time chart according to the present invention.

First, a pneumatic spinning machine to which the present invention is applied will be described. As shown in FIG. 6, 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 unit Sp, the spun yarn 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 thickness is supplied to a spinning unit Sp including a spinning nozzle N and a spindle unit S, and is formed into a spun yarn Y in the spinning unit Sp. Spindle S
Is held by the 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 leading end of the spindle section S is a leading end spindle 1a, and the leading end of the yarn passage at the center thereof is an inlet 1b. 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 distal end spindle 1a, but is not 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 section S 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 as a fulcrum.
Is separated from the winding drum 7 and is in a standby state, but the mechanism thereof will not be described in detail here. The nip roller Rn for feeding the spun yarn Y from the spinning unit Sp to the winding unit W 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 the lever device provided.

The piecing device P can be driven by a drive wheel 14 on a rail 13 passed over a frame 12 below the spinning machine, and has two pairs of 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 pulled out of the package 5 is used as the parent yarn Ya.
And a transfer arm member Ta or the like which is gripped at a predetermined position and transferred to the trumpet-shaped rear end portion 10 of the spindle portion S.

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. 5, 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, so that a yarn end can be sucked by suction from a blower (not shown). ing.

As shown in FIG. 5, when the suction mouth 17 which has sucked the thread end rotates upward and enters a standby state, the sucked thread 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 R1 and the driven roller R2, which are a pair of feed rollers R included in the front end head member k, the cutter 1 attached to the guide member Gu
The thread end is cut by 8 to make the length of the thread end projecting from the feed roller R constant. Thereafter, as shown in FIG. 3, 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 10 of the spindle portion S. Is transported.

As shown in FIG. 4, the transfer arm member Ta is constituted by 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 is ejected from the yarn feed nozzle 3 and the yarn is fed by the rotation of the feed roller R. The yarn Ya is sent out in front of the spindle section S. At this time, the air jet from the yarn feed nozzle 3 may be a continuous jet with a low strength, but intermittent jet is more effective.

The spindle section S is composed of a tip spindle 1a,
The pipe 1c, the yarn feed nozzle 3, and the trumpet-shaped rear end portion 10 were separated by a gap k, and the periphery thereof was covered with the porous member 2. Since a pipe 2b made of a sintered metal element generally used for a silencer of a pneumatic member and a filter is mounted as a filter member in the intermediate portion,
The compressed air supplied from the air supply pipe 3a via the valve 3b moves forward without backflow, and moves from the minute gap 3c between the yarn feed nozzle 3 and the flared rear end 10 to the front end spindle 1a. Most of the gas is discharged toward the outside through the gap k through the filter member. Since the porous member 2 has the plurality of minute holes 2a, the supply air is discharged slowly. Therefore, the airflow flowing through the center of the spindle portion is maintained as it is, and is discharged to the outside from the distal end spindle 1a, so that the yarn can be transported by the airflow at the central portion.

Air injection from the minute gap 3c between the yarn feed nozzle 3 and the flared rear end 10 constitutes a so-called air sucker, and a suction flow for sucking outside air of the wrapped rear end 10 into the spindle. Is generated. The conduit 1c serves as a flow straightening tube, and forms a passage for the sucked outside air at the center of the conduit. That is,
The yarn end introduced from the rear end of the spindle together with the outside air suction flow is configured to travel through the center of the conduit.

After the air injection from the yarn feed nozzle 3 and the feeding of the parent yarn Ya by the rotation of the feed roller R have been performed for a predetermined time, the spindle portion S is once joined to the spinning nozzle N. At this time, if air is injected from the spinning nozzle N,
The injected air is supplied to the inlet 1 of the tip spindle 1a.
A high-speed air flow is generated in the vicinity of b, and as a result, a discharge flow from the inside of the spindle to the outside is generated. For this reason, the lead yarn Ya that is likely to become clogged in the spindle is easily pulled out to the outside by this discharge flow. After air is injected from the spinning nozzle portion for a predetermined time, the spindle portion S is separated from the nozzle portion N again, the feed roller R and the yarn feed nozzle 3 are operated to send the parent yarn Ya to the outside from the spinning portion Sp, and a suction pipe is provided. Let Ku suck. Then, the spindle unit S and the spinning unit Sp are joined to complete the preparation for piecing. At this time, if the piecing is performed while slightly pressing the main yarn Ya with the main yarn gripping member 4, a strong and beautiful spliced portion can be obtained.

FIG. 7 shows an example of the above-mentioned piecing process from the thread break occurrence time T0 to the spinning resumption time T1.
The injection of the spinning nozzle N is stopped at the time T0 when the yarn breakage occurs. At t1 immediately after that, the spindle unit S retreats and separates from the spinning nozzle N. Thereafter, the piecing device P detects the yarn breakage, stops at the yarn breakage weight, and starts the piecing at time t2. The feed roller R mounted on the piecing device P grips the main yarn Ya and transfers it to the flared rear end 10 of the spindle portion S, and then starts the yarn feeding at t3. At the same time, the injection starts from the yarn feed nozzle 3, and the parent yarn Ya is conveyed into the spindle S by the cooperation of the feed roller R and the yarn feed nozzle 3, and is transferred to the tip spindle 1a.

The feeding operation of the feed roller R is interrupted at a time t4 when the main yarn Ya is normally operated and the main yarn Ya slightly comes out of the entrance 1b. Then, the pindle portion S is once joined to the nozzle portion Sp from time t5 to t7. Injection is performed from the spinning nozzle S for a predetermined time from time t5 to t6. Alternatively, the injection of the spinning nozzle for cleaning the inside of the spindle is performed at time t.
2 may be performed. After the spindle portion S is separated again, the feeding operation of the feeding roller R is started at time t8. At a time t9 when the yarn feeding is performed for a predetermined time and finished, the spindle unit S is joined to the spinning unit Sp, and the preparation for starting the spinning is completed.
After that, the driving of the draft roller is started and the time t1
At 0 (at the same time as T1), the air injection from the spinning nozzle N is started, and the spinning is restarted.

As described above, in the present invention, the spindle portion S and the nozzle portion N
And air is injected from the spinning nozzle, so that the yarn that has been normally passed through the parent yarn Ya naturally remains as it is, and the parent yarn Ya once caught in the middle is also It was drawn out to the outside during air injection from the machine, greatly improving the success rate of threading.

The reason why the spindle portion S is separated from the spinning nozzle portion N is that the spindle portion S is separated for cleaning because there is a possibility that thread debris or the like may be clogged at the time of thread breakage. However, there may be a case where it is not necessary to separate the yarn with a yarn type having a small amount of impurities. At this time, since the spindle portion S is always in the spinning position while being joined to the spinning nozzle portion N, it is preferable that air is jetted from the spinning nozzle portion for a predetermined time after feeding the main yarn for a predetermined time.

Spinning is started after the above-mentioned piecing preparation is completed. 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. The tip of the drafted sliver L is once sucked into the suction pipe Ku. After that, the package 5 comes into contact with the winding drum 7,
When the spinning is started by the injection of the compressed air from the spinning nozzle N, the sliver L sucked into the suction pipe Ku is rotated.
Is joined to the main yarn Ya and drawn into the spinning unit Sp, so that piecing (splicing) is performed.

As described above, the air spinning machine has been described as an embodiment to which the present invention can be applied. However, the present invention is also applicable to piecing of a spinning machine other than the air spinning machine, for example, an open-end spinning machine.

[0028]

As described above, according to the present invention,
At the time of piecing for piecing a pneumatic spinning machine, when the parent yarn Ya unwound from the package is reversely moved inside the spindle by the suction member and the yarn feed roller R to feed the yarn, once during the threading, Since the feed roller is stopped and the threading operation is restarted after performing the air injection from the spinning nozzle section for a predetermined time, even if the parent thread is clogged in the spindle section, the air injection from the spinning nozzle is performed for a predetermined time. By doing so, the suction force acts in the direction of discharging the clogged parent yarn to the outside, and the yarn clogging is eliminated. Furthermore, since the spinning nozzle performs the air injection when the separated spindle unit is joined to the nozzle unit, the discharging force from the tip end of the spindle to the outside can be effectively exerted. In addition, since the air injection from the yarn feed nozzle is intermittently performed, the parent yarn Ya
Threading has become more stable.

[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, showing a state in which the parent yarn is sent out before a nozzle member by blowing compressed air after introduction of the parent yarn into a spindle portion.

FIG. 3 is a side view illustrating a piecing operation of the piecing apparatus to which the present invention is applied.

FIG. 4 is a front view showing one spinning unit.

FIG. 5 is a perspective view showing a state where a suction mouth sucks a yarn end and returns to a standby position during piecing.

FIG. 6 is a front view showing an entire spinning machine having a piecing device to which the present invention is applied.

FIG. 7 is a diagram showing a time chart according to the present invention.

[Explanation of symbols]

 3 Yarn feed nozzle 5 Package Y Spun yarn Ya Parent yarn Sp Spinning unit S Spindle unit N Spinning nozzle unit D Draft unit P Pishing device L Sliver

Claims (3)

[Claims] At the time of piecing for splicing spliced yarns, when the parent yarn on the package side is transported to the spinning unit by running backward in the spindle unit, air injection from a pair of feed rollers and a yarn feed nozzle is performed. Wherein the feed roller is temporarily stopped in the middle of the threading, air injection from the spinning nozzle portion is performed for a predetermined time, and then the threading operation is restarted. 2. The spinning section comprises a spinning nozzle section and a spindle section, and the spindle section contacts between a spinning position approaching the spinning nozzle section and a standby position disengaged from the spinning nozzle section. 2. The air jetting from the spinning nozzle portion which is configured to be detachable and which is performed for a predetermined time is performed when the spindle portion which has been separated at the start of piecing is rejoined with the spinning nozzle portion. The threading method according to 1. 3. The threading method according to claim 1, wherein air injection from the yarn feed nozzle is performed intermittently.