JPH0444632Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to a tensor used in a double twisting machine, and particularly to a tensor that is provided with tension by the attractive force of a magnet.

[Conventional technology]

As shown in FIGS. 7 and 8, the conventional double-twisting machine has a capsule tensor 42 inside a hollow shaft 41 of the double-twisting machine. During normal operation of the capsule tensor 42, as shown in FIG. It is pressed against an upper guide 47 fixed to 41. The capsule tensor 42 consists of an upper capsule 48 and a lower capsule 49 that is slidable therein, and the upper capsule 48 and the lower capsule 49 are always urged apart by a spring provided inside.
Further, a permanent magnet 51 is provided on the side surface of the shaft 41 at a height corresponding to the position of the capsule. As shown in FIG. 7, in the normal operating state of the double twisting machine, the yarn 50 enters from above the upper guide 47, passes through the pressure contact part S between the upper guide 47 and the upper capsule 48, and then reaches the first stage tension. Can be applied. Next, this thread 50 passes through the pressure contact portion T between the lower guide 46 and the lower capsule 49, and is subjected to a second stage of tension. On the other hand, when threading the thread through this tenser, if suction is applied from the lower part of the tenser in the figure, the guide piston 4
5 slides downward against the spring 44 with the lower guide 46. At the same time, the lower guide 46
and the tensor 4 that was held between the upper guide 47 and the upper guide 47.
2 becomes a free state. As a result, as shown in FIG. 8, the magnetic capsule tensor 42 is attracted to the permanent magnet 51 of the shaft 41, and in order to free each hole of the upper guide 47 and the lower guide 46, the thread 40
is threaded through each hole. When using a capsule tensor as described above, the thread is squeezed at the tensioning part, so
Fly fluff, leaf debris, etc. tend to adhere to the capsule, and when they do, the capsule becomes shorter and the spring is compressed, increasing the pressing force and providing strong tension. In addition, if the thickness of the fed yarn is non-uniform, a strong tension will be applied when a thick portion passes, and a weak tension will be applied when a thin portion passes. In addition, during normal tension application, tension fluctuations occur depending on the yarn feeding condition such as fluctuations in unwinding tension, but when the tension is released from a stronger than normal tension and returns to the steady tension, the spring's inertia causes the tension to change. The tension becomes weaker than the steady state, and when the tension returns to the steady state, a hunting phenomenon occurs in which the tension goes too far to the side where the tension is stronger than the steady state, and it takes time for the tension to stabilize at a predetermined value. Therefore, it is necessary to set the applied tension high in anticipation of the safety of applying the tension, and it is difficult to set the additional tension and it is difficult to apply an appropriate tension.

[Problem that the idea aims to solve]

In view of the above points, an object of the present invention is to obtain a tensor that can prevent the added tension from varying due to the thinness of the thread and can always add a tension close to the target tension to the thread.

[Means to solve the problem]

Tension-applying plates are fixed to the facing surfaces of the magnets or the magnets and the magnetic material attracted by the magnets, and the thread is passed between the two tension-applying plates to reduce tension fluctuations and optimize the tension setting.

[Effect]

When the yarn is passing through a thick section, the distance between the opposing magnets is large, so their attraction to each other is weakened, and as a result, a weak nipping force is applied to the yarn to make the yarn pass smoothly. After the above-mentioned portion has passed, the distance between the magnets becomes smaller, the additional tension increases and becomes a predetermined value, and even if the tension fluctuates depending on the yarn feeding condition, it immediately returns to a steady state and the additional tension becomes stable.

【Example】

A first embodiment of the present invention will be described based on FIGS. 1 and 2. Spacers 2 and 3 are provided on both sides of the spindle shaft 1 to form a chamber 4 therein. An elastic body 5 such as rubber is bonded inside the chamber 4, and an iron plate 6 is bonded to the surface thereof. An upper fixing member 10 is formed by bonding an upper fixed magnet 7 above the surface, an elastic body 8 to the surface thereof, and a tension applying plate 9 made of a metal plate such as stainless steel to the surface.
Similarly, below the surface of the iron plate 6, a lower fixed magnet 11, an elastic body 12, and a tension applying plate 13 made of a metal plate are adhered in order, and the lower fixed member 14
form. An upper movable member 18, which has an upper movable magnet 15, an elastic body 16, and a tension imparting plate 17 made of a metal plate such as stainless steel plate bonded in this order facing the upper fixed member 10, is bonded and fixed above the iron movable plate 19. Similarly, a lower movable member 23, which has a lower movable magnet 20, an elastic body 21, and a tension applying plate 22 made of a metal plate adhered in this order, is adhesively fixed below the movable plate 19 facing the lower fixing member 14. The movable plate 19 is movable from the outside using a rod 24 or the like. On the other hand, the upper fixed magnet 7 and the upper movable magnet 15 are opposed to each other with polarity attracting each other,
Similarly, the polarities of the lower fixed magnet 11 and the lower movable magnet 20 are set so that they attract each other. Incidentally, the iron plate 6 and the iron movable plate 19 act as a yoke for each magnet. With the above structure, during normal operation of the tensor, the thread 25 entering from the upper through hole attracts the upper fixed member 10 by the tension applying plate 9 on the surface and the tension applying plate 17 of the upper movable member due to the attraction action of both the magnets 7 and 15. A primary tension is applied through the matching space 26, and the tension applying plate 13 is similarly applied.
After the second tension is applied through the space 27 between and 22, the yarn is fed from the lower through hole. Each of the elastic bodies 5, 8, 12, 16, and 21 functions as a cushion that prevents the applied tension from varying depending on the yarn feeding state. Furthermore, when threading is required, a threading hole can be formed inside by pulling the rod 24 from the outside. In a tensor using such a magnet,
Due to the characteristics of magnets, as the distance between them increases, the attractive force weakens, so they exhibit a downward-sloping tension imparting characteristic as shown in FIG. Therefore, even if the two magnets are separated depending on the state of the yarn feeding, a strong pulling force is not generated, so that the yarn immediately returns to a steady state without causing vibrations due to hunting like in a spring type, as shown in FIG. Furthermore, as shown in Fig. 6, in the double twisting machine, the tension increases according to the unwinding speed, but in the conventional spring type, the tension oscillates between a and a' above and below the center value O. The amplitude of vibration tends to gradually increase as the unwinding speed increases, but in the magnetic type, the fluctuation occurs only on one side of the center value -O, and hunting does not occur, and even on that side The vibration width is smaller than that of . Furthermore, the tendency for the fluctuation range to increase as the unwinding speed increases is smaller than in the spring type. A second embodiment of the present invention will be explained based on FIG. At the upper part of the chamber 4 in the spindle shaft 1, a first tension applying plate 30 made of a leaf spring and a second tension applying plate 31 made of a leaf spring are provided, which are fixed to the first fixed shaft 28 and the second fixed shaft 29. Both tension applying plates 30 and 31 are fixed to fixed shafts 28 and 29 so that they are always biased toward each other. A first magnet 33 is adhesively fixed above the first tension applying plate 30 via an elastic body 32, and a second magnet 35 is adhesively fixed below it via an elastic body 34. Opposed to each magnet 33, 35, the second tension applying plate 31 has third and fourth magnets 36, 37.
are provided via elastic bodies 38 and 39. The first magnet 33 and the third magnet 36 facing each other are installed so as to attract each other, and the second magnet 35 and the fourth magnet 3
7 is installed in the same way. In the above configuration, the thread 4 entered from the upper through hole
0 enters the space 41 between the first tension applying plate 30 and the second tension applying plate 31, and is caused by the spring force of both tension applying plates 30, 31 and the attraction action of each magnet 33, 35, 36, 37. Tension is applied and the yarn is fed through the lower through hole. The properties of the tensor are shown as the composite properties in Figure 4. As a result of the spring properties rising to the right and the magnet properties falling to the right, the additional tension is partially reduced in the center, but it is large even if the distance is small. It is also possible to provide the same tension, making it possible to provide stable tension. Note that it is also possible to use a magnetic material such as iron or nickel in place of the above-mentioned magnet, but in that case, one of the two sides of the tension applying plate should be a magnet.

[Effects of the invention] In the tensor of the present invention, tensioning plates are fixed to the opposing surfaces of the magnets or the magnets and the magnetic material attracted by the magnets, and the thread is passed between the two tensioning plates. Due to the characteristics of the suction action of
Tension fluctuations are reduced even when a thick or thin yarn is fed. Therefore, there is no need to apply a large tension in anticipation of safety, unlike in the past, and the tension can be set reliably. Further, even if fluff adheres to the tension applying section or a thick portion of the yarn feed passes through, the thread can pass smoothly without applying strong tension like a spring. In the device of the present invention, there are two or more tension applying sections in the yarn passage, so the distance between the tension applying plates changes depending on the thickness of the yarn, and its response characteristics are poor and it does not return to a steady state quickly. Even if the time is right,
This can be compensated for by the second and subsequent tension applying parts. Further, since an elastic body is interposed between the tension applying plate and the magnet or magnetic body, a cushion effect is produced to prevent the tension from fluctuating.

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the present invention, FIG. 1 is a cross-sectional view of the device during normal operation, FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1, and FIG. A cross-sectional view of the second embodiment of the present invention, FIG. 4 is a graph showing the relationship between the distance between the tensors and the additional tension, FIG. 5 is a graph showing the progress of the additional tension variation, and FIG. Graphs showing changes in tension shown in Figures 7 and 8 show conventional examples;
The figure is a cross-sectional view during normal operation, and FIG. 8 is a cross-sectional view during threading. 7... Upper fixed magnet, 8, 12, 16, 21,
32, 34, 38, 39... elastic body, 9, 13,
17, 22, 30, 31... tension imparting plate,
11...Lower fixed magnet, 15...Upper movable magnet,
20... lower movable magnet, 33, 35, 36, 37
……magnet.

Claims (1)

[Scope of utility model registration request] Tension applying plates are fixed to opposing surfaces of magnets or magnets and magnetic bodies attracted by the magnets via elastic bodies, and tension applying parts for feeding the yarn between both tension applying plates are provided at two locations in the yarn passage path. A tenser in a double twisting machine characterized by the above provision.