JPH0412063Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a yarn end untwisting device in a pneumatic yarn splicing device.

[Conventional technology]

As a yarn splicing method in the spinning process, especially in the finishing process, the pneumatic yarn splicing method has advantages such as no knot knots and almost no discernible seams in the final product. Among the pneumatic yarn piecing methods, it is possible to obtain a good seam by untwisting the yarn ends and loosening the fibers, or by separating and removing part of the fibers at the tip of the yarn ends to create a tapered shape. It is an effective means for

The present applicant has already suctioned the yarn end into a nozzle pipe and untwisted the yarn end by the action of the air flow in the pipe, or further separated and removed a part of the fiber at the tip of the yarn end to create a yarn with a good taper. I have applied for a method to obtain the edge shape (Special Publication No. 1987-47108).
This was the case when only single yarns were used, and for double yarns, there were twists in opposite directions, namely top twist and bottom twist, and a good untwisting state could not be obtained.

Note that there are various kinds of portable double yarns depending on the manufacturing method. In other words, the spun yarn (single yarn) produced by a ring spinning machine is rewound into a cheese- or cone-shaped package cage using an automatic winder in the next step, and two of these package cages (single yarn) are used as yarn feeding package cages to form ring-twisted yarn. The two yarns supplied to the machine and pulled out are doubled and twisted into a double yarn, and the spun yarn (single yarn) from the ring spinning machine is rewound using a winder.
After double-plying the single yarn of the book, the package obtained by this double-plying machine is fed to a double twisting machine and twisted to obtain double yarn. There are double yarns and the like that can be obtained by directly feeding two packages as a two-stage yarn feeding package to a double twisting machine and then combining and twisting the yarns without passing the single yarn through a yarn combination machine.

Therefore, for example, in the above, the two packages that are fed to the ring twisting machine as yarn feeders are still single yarns because the spun yarn is simply rewound, and the single yarns are not supplied to the ring twisting machine. It has a unique twist direction given by
The twisting directions of the yarns in the two package cages mentioned above are both S-twist, and when the ring twisting machine combines these two S-twist yarns by twisting them in the opposite Z direction, the twist of the single yarn is The direction (hereinafter referred to as "first twist") is opposite to the twisting direction (hereinafter referred to as "first twist") of the double yarn obtained by combining the yarns.

Therefore, in some cases, the yarns are twisted while being twisted in the same direction as the twisting direction of the single yarns. In this case, the twisting directions of the first twist and the final twist are the same, and the two single yarns are twisted in the same direction. One of the twist directions is S,
There may also be a double yarn in which the other one is Z, that is, the first twist is S, Z and the final twist is S, or a double yarn in which the first twist is S, Z and the final twist is Z.

[The problem that the idea aims to solve]

This invention allows airflow to act on the twin yarns sucked into the nozzle pipe to untwist the ends of the twin yarns in a good manner, and also to obtain a good splicing condition using the pneumatic splicing device. This is what we are trying to do.

Among the above-mentioned various double yarns, the present application deals with double yarns in which the twist direction (first twist) of two single yarns is the same (for example, Z twist), and the final twist is in the opposite direction to the first twist (S twist). It provides something that is particularly effective.

[Means to solve the problem]

This invention has two different circumferential directions of the untwisting nozzle pipe.
At the point, the first one, which forms a certain angle toward the axis,
A second compressed air outlet is provided.

[Effect]

Insert the yarn end portion of the double thread into a nozzle pipe having first and second compressed air jet holes which are bored at two places in the pipe and have different directions of ejecting air toward the pipe axis. , first blowing compressed air into the pipe from the first compressed air blowing hole and exposing the yarn end to a swirling air flow in the direction of untwisting the first twist;
Next, the jetting of compressed air from the first compressed air jetting hole is stopped, and the compressed air is spouted into the pipe from the second compressed fluid jetting hole, and the untwisting is applied to the swirling air flow in the direction of untwisting the first twisting. The twisted yarn ends are exposed and the upper twist and lower twist can be untwisted.

〔Example〕

FIG. 1 shows a state in which a pneumatic yarn splicing device 3 is installed in an automatic winder (not shown), and a bobbin side yarn YB and a package side yarn YP are respectively guided by suction pipes 1 and 2 during yarn splicing.

At the center of the pneumatic splicing device 3, a nozzle block 4 having a cylindrical splicing hole 5 and an air guide hole 6 that opens into the splicing hole 5 and generates a swirling air flow is connected to a block 29 via a front plate 7. It is screwed on. A thread presser lever 18 is attached to the front plate 7 so as to be able to move forward and backward with the nozzle block 4 in between. On both sides, nozzle holes 12 and 13 are bored on the front plate 7 and continue to a nozzle pipe 26 located at the back.

Further, the front plate 7 is provided with thread guide blocks 8, 9, 10, 11, which together with the grooves of the fork guides 16, 17 serve as thread guides. Thread cutting devices 14 and 15 are arranged inside the fork guides 16 and 17, and cut the bobbin side threads YB and 15, respectively.
It is designed to cut the side thread YP of the package cage.
On both sides of the fork guides 16, 17, a pair of thread shifting levers 19, 20 are rotatably supported by a bar 21, and the thread shifting lever 20 comes into contact with a stopper 22 and stops. . Clamp devices 2 are installed on both sides of the thread shifting levers 19 and 20.
8 and 24, which are adapted to clamp the package side thread YP and the bobbin side thread YB, respectively. A yarn detection device 25 is disposed at the bottom of the pneumatic yarn splicing device 3, but its operation will be omitted here.

Next, the area around the nozzle pipe 26 at the back of the nozzle hole 12 will be explained, and the nozzle hole 13 has a similar structure.

As shown in FIGS. 2 and 3, the nozzle pipe 26 includes
Two ejection holes 27 and 28 are formed at a certain angle toward the axis, so that compressed air is ejected. Due to this angle, a suction flow is generated in the nozzle hole 12, and the yarn end cut by the approaching yarn cutting device 14 is sucked into the nozzle pipe 26. Two conduit pipes 30 and 31 are perforated in the block 29 to which the nozzle pipe 26 is fitted, and one end leads to the ejection holes 27 and 28, respectively, and the other end passes through on-off valves 32 and 33, respectively, to supply compressed air (not shown). It leads to the source of supply.

Now, let's explain the thread splicing operation. When thread breakage occurs, the suction pipe 1 turns by a mechanism not shown to suck and hold the bobbin side thread YB, and the suction pipe 2 similarly absorbs and holds the bobbin side thread YB.
The YP is suctioned and held and guided to the front of the pneumatic splicing device 3 as shown in FIG.

Next, the thread presser lever 18 once retreats to the solid line position in Figure 1, and the thread guide levers 19 and 20 turn to
When YP and YB are guided to the front plate 7,
The thread presser lever 18 approaches the front plate again to help guide the thread. Both yarns YP and YB are guided through the grooves of fork guides 16 and 17 and through yarn guide blocks 8, 9, 10 and 11. The yarn YP passes through the clamp device 23, the right groove of the fork guide 16, the yarn splicing hole 5 between the yarn guide blocks 8 and 10, the right side of the yarn guide block 11, the yarn cutting device 15, and reaches the right groove of the fork guide 17. thread
YB reaches the clamp device 24 via the left groove of the fork guide 16, the thread cutting device 14, the left side of the thread guide block 10, the thread splicing hole 5, between the thread guide blocks 9 and 11, and the left groove of the fork guide 17. . Next, the clamp devices 23 and 24 respectively
Clamp YP and YB.

Furthermore, the yarn cutting devices 14 and 15 are connected to yarn YB and yarn YB, respectively.
Disconnect YP. Concurrently with this, the nozzle pipe 26 operates, and the cut yarn ends YB, YP are sucked through the nozzle holes 12, 13, respectively. When the yarn ends have been untwisted in the nozzle pipe, the yarn pulling lever 1
9 and 20 further move forward, and the yarn ends YP and YB untwisted within the nozzle pipe are pulled out from the nozzle pipe and aligned in the yarn splicing hole 5.

At this point, compressed air is blown out from the air guide hole 6, creating a swirling flow inside the splicing hole 5 and splicing the yarn.

Next, let's explain the function of the nozzle pipe section.

In addition, in this example, the yarn YB is S-twisted,
It is assumed that the yarn is a double yarn with a Z twist and a Z twist. That is, the twist shown in the yarn YB shown in FIGS. 3 and 4 shows the S twist, which is a ply twist.

The thread cutting device 14 shown in the first diagram is a clamping device 24.
Around the same time as the thread is cut between the suction pipe 1 and the suction pipe 1, the on-off valve 32 shown in FIG. gush. As mentioned above, the ejection hole 27 faces the axial direction of the pipe 26, and
As shown in the figure, since the pipe is bored obliquely in the depth direction, the airflow ejected from the nozzle 27 collides with the opposite side wall surface of the nozzle 27, as shown in Figure 3, and swirls in opposite directions. It separates into the flow and flows in the depth direction of the pipe.

Therefore, the cut yarn end is inserted into the nozzle pipe by the suction action generated at the nozzle pipe inlet, and is positioned at the position shown in the figure, which is the shortest distance determined by the positional relationship between the splicing hole 5 and the pipe 26. That is, the thread within the pipe 26 is exposed to one of the different swirling flows. In this example, since the final twist is an S twist, it is exposed to a swirling flow in the direction of unraveling the S twist. Note that, as is clear from FIG. 2, the swirling flow flows out from the rear end of the pipe while drawing a gentle spiral due to the inclination of the jet hole 27 in the depth direction.

Therefore, the jet stream from the jet hole 27 causes the yarn to
When the ply twist of YB is untwisted, pipe 2 of yarn YB
The yarn end portion inside 6 is in a state where it is separated into two single yarns. Note that since the twisting direction (first twist) of this single yarn is the Z direction, it is not untwisted by the jet flow in the direction of untwisting the first twist.

Next, as shown in FIG. 4, the on-off valve 32 is closed and the on-off valve 33 is opened, and compressed air is ejected from the ejection hole 28 located about 90 degrees apart from the ejection hole 27.
The separated single yarns of the book are exposed to a swirling flow in the direction of untwisting, and the Z twist of each single yarn is untwisted.

The on-off valves 32 and 33 can be opened and closed at appropriate timing through the action of a cam and an actuator of an electromagnetic valve. That is, the length of the yarn end inserted into the nozzle pipe is several tens of millimeters at most, and the number of twists that a yarn of this length has is naturally small in relation to the length of the yarn end. Therefore, the compressed air jet time for untwisting the ply twist of the double yarn or the compression jet time for untwisting the ply twist of the double yarn is extremely short, and only the ply twist of the double yarn is untwisted, and the two single yarns are untwisted. The optimum time is set depending on the yarn type, yarn end insertion length, air pressure, etc., to determine the time required to separate the yarn into threads and to untwist only the first twist of the single yarn. It is.

In addition, in the above explanation, regarding the point where the ply-twisted double yarn is untwisted and separated into two single yarns, there is a case where the double yarn is completely separated into two single yarns, or when the fibers are slightly entangled. This also includes cases where the fibers are not separated into two, but at least the double thread state has collapsed.

Furthermore, with regard to the fact that the first twist of a single yarn is untwisted, if two individual single yarns are untwisted while maintaining a separated state, furthermore, when they become a single yarn and are untwisted, In either case, the twists of the two single yarns that made up the double yarn are untwisted, the fibers that make up the single yarn become parallel, and In this case, some fibers at the tip of the yarn end are separated and removed from the yarn end, resulting in a fine yarn end shape that tapers like the tip of a brush.

As explained above, even in the case of double yarn, the yarn ends are first exposed to a swirling flow in the direction of untwisting the ply twist,
Next, by exposing the first twist to a swirling flow in the direction of untwisting, the top twist and first twist are sequentially untwisted, and the fibers are untwisted and loosened, and a good yarn end shape is obtained when splicing the tapered yarn. be able to.

[Effect of idea]

With such a double yarn untwisting device, it has become possible to obtain a sufficiently beautiful seam even in double yarns using the pneumatic splicing device.

[Brief explanation of the drawing]

FIG. 1 is a front view showing how the bobbin-side thread and the package-side thread are guided to the pneumatic splicing device. FIG. 2 is a sectional view showing the vicinity of the nozzle pipe following the nozzle hole, and FIGS. 3 and 4 are schematic sectional views showing the flow of compressed air within the nozzle pipe. 26... Nozzle pipe, 27, 28... Spout hole, 32, 33... On-off valve, YB, YP... Yarn end.

Claims (1)

[Scope of utility model registration request] At two different locations in the circumferential direction of the untwisting nozzle pipe,
A yarn end untwisting device for twin yarns, characterized in that first and second compressed air jet holes are formed that face the axial direction of the pipe and are inclined in the depth direction of the pipe.