JPS60209028A - Yarn staying device - Google Patents

Abstract

PURPOSE:The yarn staying zone is provided between the twister and the take- up gear whereby the take-up speed of the yarn can be set independently from the spinning speed. CONSTITUTION:The yarn Y is drafted, twisted, taken up with a pair of delivery rollers 9a and 9b, passed through the yarn staying zone and wound up. The yarn staying device 10 is equipped with delivery roller 21, trailing roller 22, endless belt 23 and press 24 and the yarn is allowed to stay between the endless belt 23 and the press 24 so that the yarn may not shrink by twisting and simultaneously the winding form of the package can be selected freely.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves drafting and heating a staple fiber bundle;
This invention relates to a yarn retention device in a winding spinning machine.

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, those using, for example, an open-end spinning method, an air spinning method, or a method of heating yarns by mechanically contacting them have been proposed.

Regardless of the method described above, the above-mentioned spinning machine consists of a part that gradually drafts the supplied staple fiber bundle and produces a spun yarn while imparting twist, and a part that directly winds the spun yarn to form a package. ing. In that case,
The speed at which the spun yarn was manufactured and spun and the speed at which the spun yarn was wound were set to be equal. This is because when the spinning speed is slower than the winding speed, strong tension is created in the winding yarn and yarn breakage occurs, whereas when the spinning speed is faster than the winding speed, after spinning This is because extra threads are generated, and such extra threads become entangled and cannot be wound.

However, for the above-mentioned reasons, the following problems have occurred in conventional spinning machines in which the spinning speed and the 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 making a cone-shaped package, the thread speed of the winding thread changes. This is because the circumferential speed is higher in areas where the diameter of the winding package is large than in areas where the diameter is small. Therefore, when yarn being spun at a constant speed is wound into 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 conventional spinning machine mentioned above, in order to remove defects such as most of the yarn, a yarn defect removal device detects the defect of glare and cuts the yarn, and an automatic yarn tying device ties the yarn again and resumes winding. Things like that were 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 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 was low, resulting in poor winding shape and poor unraveling. Conventionally,
As a solution to the above-mentioned problems related to yarn tying, there have been proposed devices that absorb the above-mentioned excess yarn with air at the same time as tying the yarn, and automatic yarn tying devices for high-speed spinning machines that can quickly perform the yarn tying process.

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 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 above first and second objects. .

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

FIG. 1 schematically shows a spinning machine to which the present invention is applied. This spinning machine has one pair of back rollers (1)
, a draft device (5) which is a draft unit consisting of a middle roller (3) and a front roller (4) equipped with an apron (2), and two air injection nozzles (6) (
7), a heating device (8) which is a heating section constituted by;
A pair of delivery rollers (9) and a yarn retention device [(10)
, a package (P), a friction roller (11) that presses against the package (P), and a traverse guide (
12) and an automatic thread tying device! (14) It consists of

With the above configuration, the stable fiber bundle (8) drawn out from the can (6) is introduced between each pair of rollers of the drafting device (5) and sent out, and is drafted to a predetermined thickness. . The fiber bundle (8) exiting the drafting device (5) is then passed through a heating device (8) consisting of two air injection nozzles (6) and (7) that generate swirling air flows in different directions. It will be introduced next. The heating device (8) is connected to the first nozzle (6).
A balloon is generated by the second nozzle (7).
This is a known air-type heating device that imparts twist to the fiber bundle 0. Note that various mechanical heating means having a similar heating mechanism can be applied as the heating device (8).

The fiber bundle (8) is heated by the heating section @ (8) to form a spun yarn (Y). The spun yarn (Y) is pulled out by a pair of delivery rollers (9) and passed through a yarn retention device (
10). Details of the thread retention device (10) will be described later.

The spun yarn (■) is temporarily retained in the yarn retention device (10), then pulled out from the device (10) and reaches the winding section (13), where it is traversed by the traverse guide (12) and transferred to the friction roller (11). The package (P) is wound up onto a package (P) which is rotationally driven.

Next, the structure of the yarn retention device will be explained in detail.

As shown in FIG. 2, the yarn retention device (10) is provided directly below the delivery roller (9aX9b). The device (
10) is a driving roller (21), a driven roller (22), an endless bell wrapped around the two rollers (21) and (22) (23), and a wear-resistant play that is a suppressing member) (24) It consists of

The above play) (24) will be explained. The pu1/-
The belt (24) is installed so as to be in contact with the outer surface of the linearly traveling portion of the belt (23), that is, the clamping surface (23a). The upper part of the plate (24) is gently bent at position (a), and the upper part of the plate (24) is
3a) and a thread receiving opening (25). Also,
The above plate (23) is located slightly below the center in the vertical direction)
, it is slightly bent, and the pinching surface (23a
) and a yarn discharge opening (26). Position (a)
The distance (J') from the position (b) to the position (b) is a length that allows a sufficient amount of spun yarn (Y) to stay there, as will be described later.

The lower end of the play (23) is pivotably supported (27)
has been done. The upper part of (24) is the arrow (2g
) is biased by a spring (29). The biasing force exerted by the spring (29) is assumed to be very weak. Note that (30a) and (30b) indicate detection windows. The detection window (3oa) (aob) is connected to the yarn retention device (10).
This is for detecting the amount of spun yarn (Y) staying there.

The drive roller (21) is moved by the arrow (3) by a drive source (not shown).
1) direction, and due to this rotation an endless bell) (23
) travels in the direction of arrow (32). The running speed of the belt (23) is set to 1/1o or less of the running speed of the spun yarn (Y) sent out by the delivery rollers (9a) (9b).

While the endless belt (23) is running, when the spun yarn (Y) is sent from the upper delivery roller (9a
). As described above, the running speed of the belt (23) is set to be considerably slower than the running speed of the spun yarn (Y) sent out by the delivery rollers (9a) (9b), so the spun yarn (Y) is The upper surface (23b) of the belt is bent into a substantially dogleg shape and is in a folded state. In this state, the spun yarn (Y) is placed on the belt clamping pressure surface (2).
3a) and play) (24) and the belt (
23), it is transported downward.

The material of the above play) (24) and the endless belt (23) has a coefficient of friction with the spun yarn (Y) (24)
The belt (23) is made higher.

For example, the belt (23) is made of steel and the plate (24) is made of ceramic. By doing so, the spun yarn (Y) is connected to the plate (24) and the belt clamping pressure surface (2).
, 9) and when the belt (23) is running, the spun yarn (Y) rubs against the plate (24) but does not rub against the belt (23). therefore,
The staying spun yarn (η) is transported as the belt (23) runs.

The figure shows the spinning yarn (Y) transferred to the lowest end position of the belt (23) to
) indicates a state where it remains.

Figure 3 shows the retention state of the spun yarn (Y) when the spinning speed and the shearing speed are equal. When the above two speeds are equal, there is no increase or decrease in the staying spun yarn (Y), and a constant amount of the spinning yarn (Y) stays at all times.

FIG. 3(a) shows the state when the winding speed is slower than the spinning speed. Since the speed of the yarn fed in from the yarn receiving opening (25) is faster than the speed of the yarn being pulled out from the yarn discharge opening (26), the amount of retained spun yarn (Y) is gradually increasing.

Moreover, FIG. 3f9 shows a state when the winding speed becomes faster than the spinning speed. Since the speed of the yarn being pulled out is slower than the speed of the yarn being fed in, the amount of retained spinning yarn is gradually decreasing.

As mentioned above, when there is a difference between the spinning speed and the winding speed, it is necessary to use the yarn retention device! (10) only increases or decreases the amount of the spun yarn (Y) staying in the yarn discharge opening (26) and the yarn tension of the spun yarn (Y) pulled out from the yarn discharge opening (26) and supplied to the winding section (13). has no effect.

Therefore, even during cone winding of the package (P) where the winding speed changes, the spun yarn can be wound without fluctuations in yarn tension.

Regarding yarn tying, the spun yarn (Y) is continuously spun while tying the yarn and from the moment of tying the yarn until the winding is restarted, that is, while the winding is stopped. (The number of threads increases, but no extra spun yarn (Y) is produced below position (1)). Strictly speaking, while the above-mentioned winding is stopped, extra spun yarn (Y) is generated by the distance traveled by the belt (23), but the yarn tying process is extremely fast. And because the belt running speed is very slow as mentioned above, the above-mentioned extra spun yarn (
Y) is very small. Therefore, the thread tension does not fluctuate due to thread knotting, and a high-quality package (P) can be obtained.

Note that the distance '<< is the length that allows a sufficient amount of spun yarn to be retained.
The length should be such that it can accommodate an increase or decrease in the amount of retained spun yarn when it is cone-wound, and it should also be long enough to retain the spun yarn spun during the yarn tying process.

FIG. 4 shows another embodiment of the yarn retention device, in which this yarn retention device (40) has two rotatable driven rollers (41) and (42) as pressing members. A member (44) consisting of an endless second belt (43) is used.

The components other than the clamping member (44) are the same as the embodiment shown in FIG.
The same members are given the same reference numerals. The pinching surface (23a) of the belt (23) and the pinching surface (23a) of the second belt (43)
43a) are in contact with each other, and the arrow (32) of the belt (23)
) direction, the pinching surfaces (23a) (43a)
Due to the frictional force between them, the second belt (43) also moves in the direction of the arrow (
45) Travel in the direction.

Like the embodiment shown in FIG.
6) It is pulled out and wound up into a package (P).

According to this embodiment, the spun yarn (
Since the yarn does not rub against anything, it is effective in maintaining the quality of the retention spun yarn (y5).

As explained above, according to the present invention, a spinning machine including a draft section, a heating section, and a winding section arranged along the flow of a staple fiber bundle is provided between the heating section and the winding section. This yarn retention device is composed of a driving roller, a driven roller, an endless belt wound around the two rollers, and a pressing member in contact with the endless belt. Since a yarn retention device for retaining the spun yarn in between is provided, the winding speed of the yarn can be set independently of the spinning speed. Furthermore, the winding shape of the winding package could be freely selected and a high-quality package could be obtained. Furthermore, in the above-mentioned yarn retention device, since the spun yarn is retained under pressure, twisting and shrinkage do not occur during retention, and the quality of the retained spun yarn can be maintained. .

[Brief explanation of the drawing]

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 according to the present invention, and FIGS. 3(A) to 3(C) are explanations for explaining the state of retention of spun yarn in the yarn retention device of FIG. 2. 4 are perspective views showing other embodiments of the yarn retention device. (5)・・・・・・・・・・・・・・・Draft section
(8)・・・・・・・・・Heating part (10)(40)・
...Yarn retention device (13)... Winding section (21) ...... Drive roller (
22)......Followed roller (23)...
...... Endless bell) (24) (44) ...
... Pressing member (B) ...... Spinning machine (S) ... Staple fiber bundle (Y) ...
・・・・・・・・・Spun yarn ll No. 40 2 Figure 2 lb [A] [Opening] [C] Figure 3

Claims (1)

[Claims] A yarn retention device provided between the heating section and the winding section of a spinning machine, comprising a draft section, a heating section, and a winding section arranged along the flow of a staple fiber bundle, the yarn retention device comprising: a driving roller; and a driven roller, an endless belt wound around the two rollers, and a pressing member in contact with the endless belt, and the spun yarn is retained between the endless belt and the pressing member. Yarn retention device.