JPS61119725A - Pneumatic twisting nozzle for fasciated spinning - Google Patents

Abstract

PURPOSE:To make it possible to prevent the clogging of fiber waste in air jetting holes for backward feeding a yarn, by providing air discharge holes facing to a yarn passage on the downstream side of an opening position of air jetting holes for twisting the yarn, and further providing the air jetting holes for backward feeding the yarn facing to the air discharge holes. CONSTITUTION:A pneumatic twisting nozzle for fasciated spinning having slitlike air discharge holes (9d) facing to a yarn passage hole (9a) on the downstream side in the yarn running direction of laces where twisting air jetting holes (9c) tilted in the yarn running direction (upward direction on the paper surface) and air jetting holes (9f) for backward feeding the seed yarn open to the air discharge holes (9d). The air jetting holes (9f) for backward feeding the yarn, of course, are provided in the tilted state in the direction opposite to the yarn running direction.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an air twisting nozzle for producing a bundled spun yarn by injecting an air flow to a fiber bundle, and more specifically, it relates to an air twisting nozzle for producing a bundled spun yarn by injecting an air flow into a fiber bundle. This invention relates to an air twisting nozzle for binding and spinning that can be easily performed.

Prior Art As a yarn splicing method in a binding spinning device that twists fiber bundles using an air twisting nozzle, the applicant of the present application reversely feeds the yarn end on the package side through the air twisting nozzle, and JP-A-59-59-925 proposes a method in which the bottom apron is separated and the tip of the fiber bundle is joined therebetween.

Japanese Utility Model Publication No. 56-42374 discloses a device for feeding yarn ends back through an air twisting nozzle, which injects air in the running direction of the yarn toward the yarn path to generate a swirling air flow and twist the fiber bundle. An air twisting nozzle is disclosed that has an air injection hole and an air injection hole that injects air toward a yarn path in a direction opposite to the running direction of the yarn to reversely feed the yarn.

Problems to be Solved by the Invention In the air twisting nozzle described in Japanese Utility Model Publication No. 56-42374, the untwisting area of the yarn passage located downstream of the twisting air injection hole when viewed in the yarn feeding direction is Since the air injection hole for reverse feeding is opened, the air injection hole may be clogged with the fibers of the fiber bundle, making it impossible to smoothly reverse feed the seed yarn during splicing.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide an air twisting nozzle that can reliably transport the seed yarn back without clogging the air injection holes for reverse transport.

Means for Solving the Problems The present invention has a twisting air injection hole that injects air in the running direction of the yarn toward the yarn path to generate a swirling air flow and twist the fiber bundle. In an air twisting nozzle that produces bound spun yarn by injecting an air flow into the bundle, an exhaust hole is connected to the yarn passage downstream of the twisting air injection hole when viewed in the yarn feeding direction during spinning, and The above purpose is achieved by an air twisting nozzle for binding and spinning, which has a reverse air injection hole facing the exhaust hole, which injects air in the opposite direction to the running direction of the yarn toward the passage to send the yarn backward. achieve.

Function In the present invention, downstream of the twisting air injection hole in the yarn passage,
Since the exhaust hole is communicated with the so-called untwisting area and the back air injection hole is made to face the exhaust hole, the back air injection hole does not open directly into the untwisting area, and the back air injection hole is not opened directly into the untwisting area. Air injection hole for IA
The balloons of i-bundle are not blocked, the binding condition is good, and yarn with good yarn quantity and quality can be obtained. In addition, the air injection hole for reverse feeding does not open directly into the untwisting area, and one bundle of tliIff is inserted into this air injection hole. 8IiM does not get clogged, so the seed yarn can be smoothly reversed during splicing. Moreover, in the present invention, an exhaust hole is opened in the untwisting area, so that the introduced air can be quickly exhausted from the yarn passage, and the fiber bundle can be well sucked into the yarn passage, so that high-quality bound spun yarn can be obtained. can get.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the drawings, which illustrate preferred embodiments of the invention.

FIG. 2 is a side view of one spindle of a spinning machine equipped with an air twisting nozzle for bundle spinning according to the present invention, and in FIG. M2, the draft device includes a pair of back rollers 1.1,
It consists of a middle apron 2.2 and a front roller 3.3. An air twisting nozzle 4 is provided downstream of and near the front roller 3.3.

The front top roller 3 of the draft device is configured to be capable of being pressed against and separated from the front bottom roller 3 by a known pressure means.

The yarn Y spun by the air twisting nozzle is passed through the draw-off roller 5.
．． 5 to a bobbin B which is supported by a cradle arm 7 and rotated by a winding drum, and is traversed by a traverse guide to form a package P.

The air twisting nozzle 4 can take a steady operating position shown by a solid line in FIG. 6 and a splicing position shown by a chain line.

The air twisting nozzle shown in FIGS. 1 and 2 consists of a first nozzle 8 and a second nozzle 9.
With this nozzle, the number of bundles can be increased by 11, and the number of bundles can be increased by 11! The fibers are tightly wrapped around the core fiber at a large twist angle.

The first nozzle 8 is formed with a yarn passage 8a, an annular air storage chamber 8b formed around the yarn passage 8a, and an air injection hole 8C connected from the air storage chamber 8b to the yarn path. Thread passage 8a
consists of a small diameter part on the upstream side and a large diameter part continuous to the small diameter part.

Similarly, the second nozzle 9 includes a yarn passage 9a, an annular air storage chamber 9b formed around the yarn passage 9a, and an air injection hole 9c connected from the air storage chamber 9b to the yarn passage. The yarn passage 9a includes an upstream small diameter section 9q and a large diameter section connected to the small diameter section.

An exhaust hole 9d is communicated with the yarn passage 9a downstream of the opening position of the twisting air injection hole 9C when viewed in the yarn feeding direction. The exhaust hole 9d in this embodiment is a slit groove formed along the axis of the yarn path as shown in FIG. The slit groove may have a constant groove width and a rectangular cross-sectional shape as shown in the figure (also, the groove width may become narrower toward the bottom of the slit, or conversely may become wider). .

In order not to block the ballooning of the SaW bundle in the yarn path 9a, the number of exhaust holes 9d is preferably 2 to 8.

A reverse air injection hole 9f is exposed to a part of the exhaust hole 9d, which is a slit groove, and communicates with an annular air storage chamber 9e. The number of air injection holes for reverse feed is
1 to 8, the angle θ with the axis of the thread path is 30 to 60°
The diameter d of the injection hole is preferably 0.3 to 1.0 mm.

Note that in the illustrated air twisting nozzle 4, the yarn passages 8a and 9a of the first nozzle 8 and the second nozzle 9 are located in a straight line, but the yarn passages 8a and 9a are arranged to intersect at an angle. It's okay.

In the above embodiment, the air twisting nozzle was of a so-called two-nozzle type, but the present invention is also applicable to a single nozzle as shown in FIGS. 4 and 5. In the embodiment shown in FIGS. 4 and 5, the upstream part of the exhaust hole 9d is communicated with the untwisting area of the yarn passage 9a, and the downstream part is an independent substantially fan-shaped passage 9.
It is set as d.

Note that the exhaust hole 9d shown in FIG. 3 may be applied to the embodiment shown in FIG. 4, or conversely, the exhaust hole 9d shown in FIG.
It may also be applied to the illustrated embodiment.

During steady operation, a fiber bundle (fleece) F is drafted to a predetermined magnification by a trough 1 to a device consisting of a back roller 1.1, a middle apron 2.2, and a front roller 3.3 to form a ribbon-like fiber bundle, It is fed into the air twisting nozzle 4.

A twisting air stream is injected from the twisting air injection holes 8c and 9° of the air twisting nozzle, while the air flow from the reverse air injection hole 9f is stopped.

The fiber bundle F is twisted and untwisted by an air twisting nozzle 4 to produce a bundled spun yarn Y, which is passed through a draw-off roller 5.5, a winding drum 6, and a cradle arm as shown in FIG. It is wound up as a parallel cage P onto a bobbin B supported by a 7.

When the spun yarn Y breaks during spinning, the package P uses a mechanism (not shown) to push up the supported cradle arm 7.
The package P is pushed up and separated from the drum 6.

On the other hand, the back roller 1.1 of the draft mechanism immediately stops, the other rollers continue to rotate, and the mN bundle F is cut between the back roller 1.1 and the middle apron 2.2.

Next, the yarn splicing machine is stopped in front of the thread cutting weight, the package drive roller (not shown) mounted on the yarn splicing machine is reversed, and the yarn end pickup mechanism (not shown) is activated to remove the package. The yarn end wound around P is pulled out and gripped by the beading roller 10.10' (Fig. 1), and the beading roller 10.10' is moved directly downstream (directly above) the final outlet of the air twisting nozzle 4. to be located.

Next, when the air twisting nozzle 4 is moved in the axial direction of the front roller 3.3 together with the beesing rollers 10, 10' and removed from the yarn path during steady operation, the air twisting nozzle 4 is moved downward, that is, on the inlet side. space is created. Through this space, a yarn end suction means 14 having a known structure is positioned on the inlet side of the air twisting nozzle 4.

While reversing the beading roller to let out the seed yarn, inject an air stream from the reverse air injection hole 9f of the air twisting nozzle 4 to send the seed yarn sent from the piecing roller to the air twisting nozzle 4, Suction is performed by the yarn end suction means 14.

Thereby, the end of the yarn formed on the package P can be smoothly led out from the final outlet of the air twisting nozzle 4 toward the entrance of the air twisting nozzle 4.

Note that if the air flow for reverse feeding is sufficiently strong, the yarn end suction means 14 may not be used. In this case, in the two-nozzle type air twisting nozzle shown in Figure 1, the diameter of the small diameter part of the second nozzle is made smaller than the diameter of the large diameter part of the first nozzle, so that the end of the yarn is caught during reverse feeding. Make sure it doesn't happen.

After the yarn end is led out to the inlet of the air twisting nozzle 4, the air flow from the reverse air injection hole 9f is stopped, and the yarn end suction means 14 is moved back from the air twisting nozzle 4. Next, the air twisting nozzle 4 is returned to the normal operating position, and the yarn end suction means 14 is positioned below the front top roller.

In this state, a back roller rotation start signal is sent, and first the clutch of back roller 1.1 is engaged to start rotation.
The Il fiber bundle is advanced into the working area of the middle apron 2.2 and further reaches the front roller 3.3.

Before the il fiber bundle reaches the front roller 3.3, first, the beading roller 10.10' is released, the package P is rotated in the normal direction, and the yarn end in the yarn end suction tube 14 is passed through the air twisting nozzle. Advance through 4.

At the same time or a little later, the front top roller 3
Operate the lever to lower the front top roller 3.
is pressed by the front bottom roller 3, the yarn end is gripped by the front roller, and is actively sent to the air twisting nozzle 4, and the yarn end passing through the air twisting nozzle 4 is adjusted to a predetermined tension.

5 Furthermore, at the same time or with a slight delay, air is injected from the twisting air injection holes 8c and 9c of the air twisting nozzle 4 to generate a swirling flow, and the yarn ends of the seed yarns overlapped by the front roller 3. and the l1111 bundle. After that, steady operation begins.

Effects of the Invention In the present invention, downstream of the air injection hole for twisting in the yarn passage,
Since the exhaust hole is communicated with the so-called untwisting area and the back air injection hole is made to face the exhaust hole, the back air injection hole does not open directly into the untwisting area, and the back air injection hole is not opened directly into the untwisting area. The balloon of the fiber bundle is not closed by the air injection holes, resulting in a good binding condition and a yarn of good quality. In addition, the air injection holes for reverse feeding do not open directly into the untwisting area, and the air injection holes are not clogged with fibers of the fiber bundle, so that the seed yarn can be smoothly fed back during splicing. Moreover, in the present invention, an exhaust hole is opened in the untwisting area, so that the introduced air can be quickly exhausted from the yarn passage, and the fiber bundle can be well sucked into the yarn passage, so that high-quality bound spun yarn can be obtained. can get.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional side view of one embodiment of the present invention, Fig. 2 is a side view of one spindle of a spinning machine embodying the present invention, and Fig. 3 is a side view of one spindle of Fig. 1.
-■ sectional view, FIG. 4 is a sectional side view of another embodiment, FIG. 5 is a v-■ sectional view of FIG. 4, and FIG. 6 is a front view illustrating the threading procedure to the air twisting nozzle It is. 4... Air twisting nozzle, 8... First nozzle, 8a.
...Yarn passage, 8G...Air for twisting 111 It
Hole, 9...Second nozzle, 9a...Year path, 9C
...Air injection hole for twisting, 9d...Exhaust hole, 9f...Air injection hole for reverse feeding,

Claims (1)

[Claims] 1. Has a twisting air injection hole that injects air in the running direction of the yarn toward the yarn path to generate a swirling air flow and twist the fiber bundle, and injects air flow to the fiber bundle to create bound spun yarn. In an air twisting nozzle for producing a yarn, an exhaust hole is communicated with the yarn passage downstream of the twisting air injection hole when viewed in the yarn feeding direction during spinning, and an exhaust hole is connected to the yarn passage with respect to the yarn running direction. An air twisting nozzle for binding and spinning, characterized in that a reverse air injection hole for injecting air in the opposite direction to reversely feed the yarn faces the exhaust hole.