JPH022777B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides for drafting staple fiber bundles;
This invention relates to a yarn retention device in a spinning machine that twists and winds yarn.

In place of conventional ring spinning machines, various spinning machines have been developed with the aim of increasing spinning speed and reducing the number of spinning steps. As the spinning machine, for example, a method using an open-end spinning method or a method of mechanically contacting and twisting yarns has been proposed.

The above-mentioned spinning machine can be manufactured by any of the above-mentioned methods.
a part that gradually drafts the supplied staple fiber bundle and produces a spun yarn while imparting twist;
It consists of a part that directly winds up the spun yarn to form a package. In that case, the speed at which the spun yarn is manufactured and spun and the speed at which the spun yarn is wound are set equal. This is because if the spinning speed is slower than the winding speed, strong tension will be created in the winding yarn and yarn breakage will occur, whereas if the spinning speed is faster than the winding speed, yarn breakage will occur after spinning. This is because extra threads are generated, and such extra threads become entangled and cannot be wound.

However, due to the above-mentioned reasons, the following problems have arisen in conventional spinning machines in which the spinning speed and winding speed are made equal and the yarn that is continuously spun at high speed is directly wound. .

The first problem was that it was difficult to wind the spun yarn into a cone-shaped package. When forming the package into a cone shape, the yarn speed of the winding yarn changes. This is because the circumferential speed is higher in areas where the diameter of the winding package is large compared to areas where the diameter is small. Therefore, when yarn being spun at a constant speed is wound onto a cone-shaped package, fluctuations in yarn tension occur in the wound yarn. The variation in yarn tension causes a density difference in the wound yarn, resulting in poor winding shape and poor unraveling.

The second problem concerns thread knots. In the above-mentioned conventional spinning machine, in order to remove defects such as thick parts of the yarn, a yarn defect removal device detects the defects in the yarn and cuts the yarn, and an automatic yarn tying device ties the yarn again and resumes winding. What was said was being done. However, since the yarn is being spun continuously and at high speed even while tying the yarn, excess yarn is generated during the tying process and from the moment the yarn is tied until the winding is restarted. As mentioned above, since the spinning speed and the winding speed are set equal, the tension of the yarn being wound is weak until the excess yarn is wound, and as a result, while the excess yarn is being wound, The thread density of the package cage was low, resulting in poor winding shape and poor unraveling. Conventionally, as a solution to the above-mentioned problems regarding yarn tying, a device that absorbs the above-mentioned excess yarn with air at the same time as the yarn tying, and an automatic yarn tying device for a high-speed spinning machine that performs a fast yarn tying process have been proposed. However, none of these methods fundamentally solves the above problems, and the higher the spinning speed, the more technical difficulties arise.

The present invention has been made by focusing on the above-mentioned problems. The first object of the invention is to enable the winding speed to be set independently of the spinning speed. Furthermore, a second object of the present invention is to freely select the winding shape of the winding package and to obtain a winding package of high quality. Furthermore,
A third object of the present invention is to maintain the quality of the spun yarn retained in the yarn retention device proposed to achieve the first and second objects described above.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 schematically shows a spinning machine M to which the present invention is applied. This spinning machine includes a drafting device 5, which is a drafting section, consisting of a pair of back rollers 1, a middle roller 3 and a front roller 4 each equipped with an apron 2, and a machine consisting of two air injection nozzles 6 and 7. A winding section 13 comprising a twisting device 8, which is a twisting section, a pair of delivery rollers 9, a yarn retention device 10, a package P, a friction roller 11 that comes into pressure contact with the package P, and a traverse guide 12; It consists of an automatic thread knotting device 14.

With the structure described above, the staple fiber bundle S drawn out from the can K is introduced between the roller pairs of the drafting device 5 and sent out, and is drafted to a predetermined thickness. The draft device 5
The fiber bundle S exiting the fiber bundle S is passed through two air injection nozzles 6, which generate swirling air flows in mutually different directions.
The twisted material is sequentially introduced into a twisting device 8 constituted by 7. The twisting device 8 is a known pneumatic twisting device in which a first nozzle 6 generates a balloon and a second nozzle 7 applies twist to the fiber bundle S. Note that various mechanical twisting means having a similar twisting mechanism can be applied as the twisting device 8.

The fiber bundle S is twisted by the twisting device 8 to form a spun yarn Y. The spun yarn Y is pulled out by a pair of delivery rollers 9 and transferred to the yarn retention device 1.
It reaches 0. Details of the yarn retention device 10 will be described later.

After the spun yarn Y is temporarily retained in the yarn retention device 10, it is pulled out from the device 10, reaches the winding section 13, and is wound onto a package P that is rotated by a friction roller 11 while being traversed by a traverse guide 12. taken.

Next, the yarn retention device 10 will be described in detail.

As shown in FIGS. 2 and 3, the main yarn retention device 10 is provided directly below the delivery rollers 9a and 9b. The device 10 includes four trapezoidal plates 21 to 2.
4, and a plurality of yarn retention plates 25a to 25c, 2 provided in the container 20.
It consists of 6a to 26c. A yarn receiving port 28 is formed by the upper end portions of the four plates, and a yarn discharge port 29 is formed by the lower end portions of the plates. The yarn retention plates are alternately fixed to a pair of opposing plates 21 and 22 of the plates in an inclined manner so that their tips are positioned slightly downward. In addition, as shown in FIGS. 2 and 3, the plates 21 and 2
2 and the yarn retention plate may be integrated. Note that 27a and 27b indicate detection windows, and the yarn retention device 10 is
The staying amount and staying state of the spun yarn Y staying there are detected.

The spun yarn Y sent from the delivery rollers 9a and 9b first accumulates on the topmost yarn accumulating plate 25a, and when the amount of spun yarn Y accumulated on the yarn accumulating plate 25a reaches a certain amount, the spun yarn Y sent from the delivery rollers 9a and 9b is transferred to the yarn one step below. The spun yarn begins to accumulate on the retention plate 26a. In this way, the spun yarn Y is retained on the yarn retention plates 25a to 25c and 26a to 26c one after another. The spun yarn Y retained in the yarn retention device 10 as described above is pulled out from the yarn discharge port 29 at the lower end of the device 10 and wound into the package P shown in FIG. In this embodiment, the distance between the tip of the lowest yarn retention plate 26c and the plate 21 is narrowed, so that a weak tension is applied to the spun yarn Y being pulled out.

Spun yarn retained in the yarn retention device 10
The amount Y' is a constant amount when the spinning speed and winding speed are equal. When the winding speed is faster than the spinning speed, the amount of the staying spun yarn Y' decreases, and conversely, when the winding speed becomes slower, the amount of the spun yarn Y' increases. However, the yarn tension of the spun yarn Y pulled out from the yarn retention device 10 is always constant regardless of changes in the winding speed.

Therefore, even when the package P is made into a cone shape, the spun yarn Y is pulled out from the yarn retention device 10 in response to changes in the winding speed required to form the cone type package, so that it is not necessary to use the conventional method. No significant fluctuations in yarn tension occur, and a high-quality package P can be obtained.

Also, regarding thread tying, the automatic thread tying device 14
The amount of retained spun yarn Y′ increases while the yarn is tied and from the moment the yarn is tied until the winding restarts.
Since the supply of the spun yarn Y from the yarn retention device 10 to the winding section 13 is stopped, no excess yarn is generated between the yarn retention device 10 and the winding section 13. Therefore, the yarn tension does not fluctuate when winding is restarted.

Note that the size of the retention container 20 of the yarn retention device 10, that is, the retention amount of the spun yarn Y, is such that the spun yarn spun during the yarn tying process can be retained, and the cone winding of the package cage can be It is also possible to cope with increases and decreases in the amount of retained spun yarn Y' caused by changes in the winding speed.

FIG. 4 shows another embodiment of the yarn retention device. In this embodiment, yarn retention plates 25a~
25c, 26a to 26d are provided substantially horizontally. Further, a pair of rotatable rollers 30 is provided below the lowest yarn retention plate 26d to apply a certain tension to the spun yarn Y drawn out from the device 10.

Further, FIG. 5 shows yet another embodiment of the yarn retention device. This yarn retention device 10 is positioned obliquely with respect to the spun yarn Y sent out from the delivery rollers 9a and 9b. Yarn retention plates 25a to 25 provided on the lower plate 21
d is inclined so that the tip is located slightly downward in the horizontal direction, and the yarn retention plates 26a to 26c provided on the upper plate 22 have a slightly steep slope. The spun yarn Y is sequentially transferred to the lower yarn retention plates 25a to 25d.
It stays.

In all of the embodiments described above, the shape of the retention container may be cylindrical or trapezoidal.

As explained above, according to the present invention, a spinning machine including a draft section, a twisting section, and a winding section arranged along the flow of a staple fiber bundle is provided between the twisting section and the winding section. A yarn retention device provided therein, consisting of a retention container having a yarn receiving port and a yarn discharge port, and a plurality of yarn retention plates installed in the retention container, and retaining the spun yarn on the yarn retention plates. Since the yarn retention device is designed to allow spinning, the winding speed of the yarn can now be set independently of the spinning speed. Therefore, the winding shape of the winding package can be freely selected and a high quality winding package can be obtained. In addition, since the yarn retention device has the structure described above, no external force is applied to the spun yarn while it is being retained, and the state of the spun yarn can be maintained as it was when it was spun. , sufficient spun yarn could be retained.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing a spinning machine to which the present invention is applied, FIG. 2 is a perspective view showing an embodiment of the yarn retention device of the present invention, FIG. 3 is a sectional front view of the same, and FIG. FIG. 5 is a sectional front view showing still another embodiment of the invention. 5... Draft part, 8... Twisting part, 10... Yarn retention device, 13... Winding part, 20... Retention container, 25a~
25d, 26a to 26d... Yarn retention plate, 28... Yarn receiving port, 29... Yarn discharge port, M... Spinning machine, S... Staple fiber bundle, Y... Spun yarn.

Claims (1)

[Claims] 1 A yarn retention device provided between an upper twisting section and the winding section of a spinning machine, which comprises a draft section, a twisting section, and a winding section arranged along the flow of a staple fiber bundle. 1. A yarn retention device comprising a retention container having a yarn receiving port and a yarn discharge port, and a plurality of yarn retention plates installed in the retention container, and retaining spun yarn on the yarn retention plates.