JPS6239099Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for adjusting tension when twisting yarn, and particularly to a yarn tension adjusting device suitable for double twin stars for twisting raw yarn for tire cords.
The purpose of this invention is to uniformly adjust fluctuations in yarn tension by improving the bobbin support cylinder, freely adjust the tension for each denier, and eliminate yarn breakage due to friction and knots. To provide a twisting yarn tension adjusting device capable of producing high-quality yarn.

BACKGROUND ART Conventionally, a fixed gate tensor as shown in FIG. 1 has been used in a tension adjustment device for a double twister that twists yarn for tire cords, for example. The raw yarn enters the upper opening of the bobbin from the yarn feeder 1, passes through the guide 3, is forcibly pressed into an uneven shape by the tensor pieces 2 and 2', is subjected to tension due to friction and bending, and passes through the guide 3'. The structure is such that it is derived. According to this conventional method, tension is applied to the yarn regardless of the denier.
There are drawbacks such as knot breakage and twist breakage that occur frequently due to friction and bending, and tension fluctuations due to wear of the tensor piece. Moreover, replacing the tensor piece at any time leads to increased costs.

The inventors of the present invention have conducted various studies to solve the problems of the conventional method as described above, and as a result, they have completed the present invention and achieved the intended purpose.

In the present invention, in a double twin star, a yarn guide cap 5 having a yarn guide port 6 is provided on the upper part of the bobbin support cylinder 4, and a pair of arms 7, 7' are attached to the cap 5 at fulcrums 12, 12'. It is rotatably supported, and a plurality of thread guide pieces 8 are fixed to the arm so that the thread passes in a zigzag manner.
The apex of the upper part is supported by the cap 5 at the fulcrum 10, and the lower end is supported by the lower part 11, 11' of the arm.
A linear spring wire 9 is attached to the arm 7, 7' to open and close the arms 7, 7' according to the tension of the yarn, and the arm and its accessories are mounted inside the bobbin support cylinder 4. The gist is a twisting yarn tension adjustment device.

The twisting yarn tension adjusting device of the present invention will be described with reference to an embodiment illustrated in FIG. The main parts of the device of this invention are:
A removable thread guide cap 5 having a thread guide port 6 is placed over the top of the bobbin support cylinder 4 inserted into the bobbin, and a pair of arms 7, which are rotatable at fulcrums 12 and 12', are attached to the cap. 7', and a thread guiding piece 8 is attached to the arm so that the thread passes in a zigzag manner.
is fixed, and the upper vertex is supported by the cap 5 at the fulcrum 10, and the lower end is supported by the lower part 11, 1 of the arm.
1' and has a straight spring wire 9.

In the device of the present invention, the average tension applied to the yarn is the sum of the wire diameter of the spring wire and the distance between the upper and lower supporting points of the spring wire, that is, the distance between the supporting points 10 and 11 according to FIG. Determined by a combination of elements. Once these two points are set and a tension adjustment device is manufactured based on them, the twisting weight to which this device is attached will maintain almost constant tension across all weights without having to adjust the tension for each weight. be done. Furthermore, the device of the present invention has an extremely simple structure and can be provided at low cost.

As for other configuration requirements, the arm length must be long enough to be inserted into the thread winding bobbin, and is 30 to 150 mm.
is preferred. Furthermore, the number of guide pieces fixed to the arm varies depending on the fibers of the original yarn and the twisting conditions, but it is usually preferable that the number of guide pieces is 3 to 10 and the interval is 10 to 20 mm. The diameter of the hole in the thread guide piece must also be large enough to prevent knot breakage, from 1mm to 6mm of the thread diameter.
~7 times is preferred. Although the shape of the thread guiding piece does not need to be particularly determined, as an example, a porcelain or metal guide having a shape as shown in FIG. 3 is suitable.

As shown in the above embodiments, according to the tension adjusting device of the present invention, the yarn passes in a zigzag manner through the yarn guiding pieces fixed to a pair of arms, and fluctuations in the yarn feeding tension act on the springs of the arms to guide the yarn. By changing the thread angle,
Tension is absorbed uniformly, and fluctuations in thread tension can be kept small and stable for a long period of time. Furthermore, even if the denier of the yarn to be supplied changes over a wide range, the tension applied to the yarn is maintained within a range that does not cause any practical problems, as the angle of the pair of arms is controlled by the spring. . For example, tire cord yarn is generally used in the range of 840 to 1890 deniers, and the device of the present invention can adjust the number of yarn guide pieces, spring strength, spring diameter, length, etc. for each denier. There is no need to change. This is something that would never have been possible with conventional equipment. On the other hand, knot breakage can be prevented by making the diameter of the hole in the yarn guiding piece appropriate, and friction breakage and twist breakage do not occur because there are extremely few friction surfaces.

Note that the diameter of the thread guide cap is the same as that of the bobbin support cylinder 4.
It is preferable not to exceed the diameter of This is convenient because only the bobbin can be removed when replacing the bobbin to be twisted. Unlike conventional devices, there is no need to remove the entire device.

When using the tension adjustment device of the present invention, tension fluctuations on the yarn feeding side, such as abnormal tension fluctuations due to irregular winding formation or fluffy yarn, can be absorbed by changing the guiding angle of the yarn passing through the yarn guiding piece using a spring. This makes it possible to maintain uniform yarn tension during twisting to obtain high-quality twisted yarn with a uniform number of twists, and to prevent yarn breakage during twisting to improve productivity. Furthermore, even if the denier of the yarn varies over a wide range, it can be used under the same conditions, making it suitable for high-mix, low-volume production. The device of the present invention is relatively simple and inexpensive to manufacture, can be made compact, and is easy to handle and use, and its industrial effects are significant.

The device of the present invention can be suitably applied to general twisting tension adjustment that can be used as a double twister, but its effect is remarkable when used for twisting yarn for tire cords.

[Brief explanation of the drawing]

FIG. 1 is an explanatory cross-sectional view of a conventional device, FIG. 2 is a cross-sectional view of an embodiment of the device of the present invention, and FIG. 3 is a plan view showing an example of a thread guiding piece used in the device of the present invention. 1... Yarn from yarn feeder, 2... Tenser piece, 3... Guide, 4... Thread winding support cylinder, 5...
... Thread guide cap, 6 ... Thread guide port, 7 ... Tension adjustment arm, 8 ... Thread guide piece, 9 ... Straight spring wire, 10 ... Upper support pin of spring wire, 11 ... Lower end of spring wire support pin.

Claims (1)

[Claims for Utility Model Registration] 1. In the double twister, a yarn guide cap 5 having a yarn guide port 6 is provided on the upper part of the bobbin support cylinder 4, and a pair of arms 7, 7' are attached to the cap 5 at a fulcrum 12. , 12', and a plurality of yarn guide pieces 8 are fixed to the arms so that the yarn passes in a zigzag manner.
The apex of the upper part is supported by the cap 5 at the fulcrum 10, and the lower end is supported by the lower part 11, 1 of the arm.
A linear spring wire 9 is attached to the arm 7, 7' to open and close the arm 7, 7' according to the tension of the yarn, and the arm and its accessories are installed in the bobbin hobbin support cylinder 4. Twisted yarn tension adjustment device. 2. The yarn tension adjustment device according to claim 1, wherein the yarn guide cap is removably fitted to the upper part of the bobbin support cylinder.