JPS6220287B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a friction-type false twisting device, and more particularly to a belt-type friction twisting device that introduces and passes a yarn between frictional engagement surfaces formed by bringing a pair of endless belt portions into cross-contact with each other. Concerning improvements in twisting devices.

Traditionally, methods for twisting yarn include the pin spindle method, internal friction method, and external friction method, but as speeds have increased, all of these methods have
There are various problems and limitations, and even the friction type, which is capable of high-speed machining, is said to have a maximum machining speed of 1000 m/min. The reason for this is that in the internal or external friction type, the thread is simply run in contact with the inner or outer surface of the rotating body, so when high-speed processing is performed, thread stays slip occurs frequently and the twisting Stability may be significantly reduced.

On the other hand, as another example of the frictional false twisting method, a pair of endless belts are brought into cross-contact, and yarn is introduced between the contact surfaces (hereinafter referred to as "between the frictional engagement surfaces") to impart false twisting. There is. Compared to the above-mentioned internal or external friction type, this method performs twisting by sandwiching the yarn between belts, so a stable false-twisting operation is expected. In particular, when the processing speed exceeds the conventional limit of 1000 m/min and reaches 1500 m/min or more, especially 2000 m/min, the above belt type false twisting device can be said to be extremely promising.

On the other hand, in order to perform false twisting of yarn efficiently in a certain space and with high productivity, one constraint is the size of the drive unit that drives the pair of endless belts. . In order to solve this problem, Japanese Patent Application Laid-Open No. 52-66752 proposes a method in which a large number of threads are passed between a single frictional engagement surface made up of a pair of endless belts. However, when the present inventors conducted additional experiments, no difference was observed between the spindles when processing at speeds of 1000m/min or less, but when processing at high speeds of 1500m/min to 200m/min, yarn deflection occurred and the threads The threads broke due to contact, and differences in thread quality were observed between the spindles. This is presumably because a large number of threads were passed between a single frictional engagement surface.

As a result of intensive research to overcome these drawbacks, the inventors of the present invention have found that only one thread passes between a single frictional engagement surface, and a large number of frictional engagement surfaces are formed by one set of drive units. We have now provided the equipment.

Thus, according to the present invention, there is provided an endless belt portion configured such that one endless belt runs suspended between a driving pulley and a driven pulley, and an endless belt configured such that two or more endless belts run suspended. A friction false twisting device is provided in which two or more independent frictional engagement surfaces are formed by bringing the parts into cross-contact with each other, and the threads are individually introduced and passed between each of the engagement surfaces. Suggested.

Hereinafter, the present invention will be explained in detail with reference to the accompanying drawings. 1st
The figure is a perspective view showing an example of the friction false twisting device of the present invention.
FIG. 2 is a plan view taken along line X-X' in FIG. 1.

In FIGS. 1 and 2, A and B are endless belt portions, and A is constructed such that two endless belts a and a' are suspended between a driving pulley 2 and a driven pulley 1 and run. Similarly, B is constructed such that one endless belt b is suspended between a driving pulley 4 and a driven pulley 3 and runs. 5 and 6
are motors that drive drive pulleys 2 and 4, respectively. Further, the endless belt portions A and B cross each other, and the belts a, a' and belt b run in contact with each other on their tension sides, and frictional engagement surfaces c and c' are formed at the contact portions. The yarns d and d' are successively introduced into the frictional engagement surfaces c and c', respectively, and are false-twisted while being sandwiched between the belts. This state can be easily understood by referring to FIG. In FIG. 2, belts a and a' run from the upper left to the lower right in the drawing as shown by the arrows, and belt b runs from the upper right to the lower left in the drawing so as to be in cross contact with them.
As a result, the frictional engagement surface c between a and b and the frictional engagement surface c between a' and b
Two frictional engagement surfaces of the frictional engagement surface c' are formed. When one yarn d and d' is introduced and passed through the frictional engagement surfaces c and c' in the running direction of the arrow, the yarn is twisted while receiving a feeding force from the belt.

As described above, according to the present invention, a plurality of frictional engagement surfaces are formed on the pair of endless belt parts, and a single thread is passed through each of them. The threads do not come into contact with each other even when the threads are bent, and the problem of thread breakage is also solved.
Furthermore, since the yarn passes through the center of the frictional engagement surface, the quality of the yarn is stable and no difference (unevenness) occurs between the spindles.

In this way, stable false twisting of a large number of yarns can be performed in a fixed space.

Although Figures 1 and 2 show a case where there are two frictional engagement surfaces, it is possible to easily increase the number of frictional engagement surfaces to three or more, that is, by configuring the belt A section with three or more belts. is possible.

Further, in FIGS. 1 and 2, an example is shown in which the endless belts are brought into contact with each other on their tight sides, but an advantage of this case is that slips between the belts are eliminated. Generally, when a belt is driven at high speed, centrifugal force increases. This deteriorates the contact between the pulley and the belt, causing slips. A commonly considered measure to prevent this slippage is to insert a spring between the driving pulley and the driven pulley to maintain a constant belt tension. However, another problem that arises with higher speeds is the increased vibration of the belt itself, which cannot be prevented by the springs. Since the yarn is twisted when it passes through the engagement surface between the belt and the belt, vibration of the belt itself is fatal in any case and contributes to the occurrence of slip between the belt and the yarn, and even worse. Extremely reduces twistability. Therefore, the key to increasing the twisting effect is how to suppress the vibrations of the belt.

In this regard, in the present invention, belt diagnostics that inevitably occur as the speed increases can be prevented by utilizing the running behavior of the belt without requiring any special equipment. That is, as a result of rotating the belt b as a model using the apparatus shown in FIGS. 1 and 2, it was confirmed that vibration was more likely to be generated on the slack side than on the tight side. Furthermore, as the running speed of the belt gradually increases, the slack side begins to vibrate more violently, and each time, as the belt tension increases, the vibration temporarily decreases, but if the speed increases further, the vibration starts again. be. For this reason, it is effective to bring the belts into contact on their tension sides.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the false twisting device of the present invention, and FIG. 2 is a plan view taken along line X-X' in FIG. In the figure, a, a', b...endless belt, c,
c'...Frictional engagement surface, d, d'... Yarn, 1, 3...
Driven pulley, 2, 4... Drive pulley, 5, 6
...The drive motor.

Claims (1)

[Claims] 1. An endless belt section configured to run one endless belt suspended between a driving pulley and a driven pulley and an endless belt section configured to run two or more endless belts suspended and running are brought into cross contact with each other. A frictional false twisting device which forms two or more independent frictional engagement surfaces by tightening the tensioner, and allows threads to be introduced and passed between each of the engagement surfaces.