JPS6245333B2 - - Google Patents

Description

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

Conventionally, methods for twisting yarn include pin spindles, internal friction methods, and external friction methods, but each method has various problems and limitations as speeds increase, making it impossible to perform high-speed processing. Even friction type machines are said to have a maximum processing 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 during high-speed processing, thread stays slip occurs frequently and the stability of the twisting becomes unstable. One example of this is a marked decrease in performance.

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 the belts, so a stable false-twist welding process is expected. In particular, when the processing speed exceeds the conventional limit of 1000 m/min and reaches 1500 m/min or more, particularly 2000 m/min, the above belt type false twisting device can be said to be extremely promising.

On the other hand, the size of the belt driving device is a constraint in order to efficiently perform the false twisting process of yarns within a certain defined space with high productivity. For this reason, Japanese Patent Application Laid-Open No. 52-66752 proposes a method of false twisting by introducing and passing two or more threads between one frictional engagement surface. There is no particular problem with this method when the machining speed is 1000 m/min or less, but
It has the disadvantage that differences (unevenness) occur between the spindles during high-speed machining of 1500 to 2000 m/min. Therefore, the present inventors made a plurality of belts run in contact with each other to form a plurality of frictional engagement surfaces.
A false twisting device has already been proposed in which individual yarns are introduced and passed between respective frictional engagement surfaces. This made it possible to perform machining without any difference between the spindles even at high speeds, but it was found that a difference between the spindles gradually appeared when machining was carried out for a long time. According to the inventors' investigation, the cause of this is the difference in the amount of elongation of each belt.
It was found that this was because the pressing force between the belts was partially different.

Belts generally contain reinforcing fiber cords or films, but belts gradually stretch during long-term operation, and there are differences in the way they stretch, which is why the above-mentioned problems occur. It is.

An object of the present invention is to provide a false twisting device that can perform multi-spindle processing in a predetermined fixed space and that does not cause unevenness between the spindles.

According to the research conducted by the present inventors, it has been found that in order to achieve the above objective, it is effective to integrate multiple belts and use a belt with uniform elongation behavior within the belt. .

Thus, according to the present invention, between the driving pulley and the driven pulley, one end is provided with an endless belt having n (n≧1) consecutive peaks in the longitudinal direction, and the other is provided with an endless belt having m (m ≧
2) By bringing the peaks of a pair of endless belts configured such that the endless belts, whose peaks are continuously formed in the longitudinal direction is suspended and running, into cross-contact with each other, a plurality of independent A false twisting device is provided which forms frictional engagement surfaces and allows individual yarns to be introduced and passed between the respective frictional engagement surfaces.

The present invention will be explained in detail below with reference to the accompanying drawings. FIG. 1 is a perspective view showing an example of a false-twisting device according to the present invention, and FIG. 2 is a sectional view of a false-twisting belt according to the present invention.

FIG. 1 shows an example of the present invention in which the number of peaks is 1 (n=
FIG. 2 is a perspective view of a false twisting device in which the endless belt b of 1) and the endless belt a having two ridges (m=2) are combined. In FIG. 1, a belt a is suspended between a driving pulley 1 and a driven pulley 2, and a belt b is suspended between a driving pulley 3 and a driven pulley 4 (not shown).
Drive pulleys 1 and 3 are driven by drive motors 5 and 6, respectively. Belt a has two ridges a′ and a″.
Belt b has two peaks (m=2).
b' (n=1) is attached. When such belts a and b are brought into cross-contact with each other, frictional engagement surfaces c' and c'' are formed by the peaks of the belts. In other words, belt a
A frictional engagement surface c' is formed by the ridge a' of the belt a and a ridge b' of the belt b, and a frictional engagement surface c'' is formed by the ridge a'' of the belt a and the ridge b'' of the belt b. , the two yarns d' and d'' are introduced and passed through the frictional engagement surfaces c' and c'', respectively, where they are pinched by the ridges of the belt and subjected to twisting and feeding forces to undergo a false twisting process.Second The figure shows a cross-sectional view of an example of an endless belt with ridges used in the present invention.The shape of the ridges may be round, triangular, trapezoidal, etc. as shown in A to C. A cross section in which the distance between the peaks is narrowed as shown in E can also be adopted.

It is preferable that the endless belts a and b are brought into contact with each other on their tension sides (that is, on the sides pulled by the drive pulley) as shown by the arrows. 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 slipping 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, how to suppress the vibration of the belt can be said to be the key to increasing the twisting effect.

In this regard, in the present invention, belt vibrations 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 FIG. 1, it was confirmed that the vibration was more likely to be larger on the slack side than on the tight side. Furthermore, as the running speed of the belt is gradually increased, the slack side begins to vibrate more violently, and each time, as the belt tension is increased, the vibration temporarily decreases, but if the speed is increased further, the vibration starts again. be. From this, it was determined that it is effective to bring the belts into contact with each other on their tension sides.

Thus, according to the present invention, since a single belt with ridges is used, it is possible not only to have multiple spindles, but also to
The amount of elongation of peak a' and peak a'' of belt a is equal, so 〓〓〓〓
It is possible to eliminate the difference between the weights due to the difference in the amount of elongation of the belt, making it possible to process at high speed for a long time.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a false twisting device according to the present invention, and FIG. 2 is a sectional view of an endless belt for false twisting used in the present invention. a, b... Endless belt, a', a'', b'... Belt mountain, 1, 3... Drive pulley, 2, 4... Driven pulley, 5, 6... Drive motor. 〓

Claims (1)

[Claims] 1 Between the driving pulley and the driven pulley, one has an endless belt in which n (n≧1) peaks are continuously formed in the longitudinal direction, and the other has m (m≧1) peaks.
2) By bringing the peaks of a pair of endless belts configured so as to run in suspension, the peaks of which are formed continuously in the longitudinal direction, into cross-contact with each other, a plurality of independent A false twisting device which forms frictional engagement surfaces and allows individual threads to be introduced and passed between each frictional engagement surface.