JPH0226913A - Detection of yarn breakage - Google Patents

Abstract

PURPOSE:To provide the title detection method designed so that a yarn-breakage sensor giving signals when a yarn is broken and a second yarn-breakage sensor detecting the decrease in fineness of a yarn are equipped at specific positions respectively, thereby individually detecting the yarn breakage in yarn doubling and winding of two kinds of filament yarns. CONSTITUTION:When two kinds of filament yarns A and B spun from two spindles of spinning units are to be put to yarn doubling and wound, two kinds of yarn-breakage sensors 41 and 45 are prepared; the sensor 41 gives yarn- breakage signals during travelling of the yarn A, whereas the sensor 45 gives signals when the fineness of a blended yarn (A+B) after yarn doubling is decreased to levels at or below a specified value during travelling of the blended yarn.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to yarn A when two types of yarn A and B spun from a two-spindle spinning device are combined and wound.

This invention relates to a yarn breakage detection method for detecting yarn breakage.

[Conventional technology]

In the spinning and winding process, if the running thread breaks, if the thread is not cut properly immediately, the ends of the cut thread may get tangled, causing problems, or the yarn being spun one after another may be unwound. It cannot be removed and it is difficult to return to normal condition. Therefore, a yarn breakage detection sensor is placed in the middle of the yarn traveling so that a yarn breakage signal is output immediately when the yarn breaks, and upon receiving this signal, the shutter is automatically operated and each roller Appropriate thread-breaking procedures such as stopping the rotation of the threads are carried out.

(Problems to be Solved by the Invention) By the way, the present applicant has developed a method for obtaining a differentially shrinkable mixed fiber yarn by supplying raw material resin from two different weights using a device as shown in Fig. 4. However, an application has already been filed (Patent Application No. 63-45417, filed on February 27, 1988).

That is, in this method, two sets of spinning spindles used in the conventional spindle type are used, and the spinneret 25 of one of the spindles is
The yarn A spun from
2, the yarn B spun from the spinneret 25a of the other spindle is stretched by two godet rollers 33, 34, and both yarns A and B are passed through the interlace nozzle 4.
In this method, the fibers are separated and combined by passing through 0. In addition, 26.26a is a cooling device, and 27.27a is an oiling roll.

In carrying out the above method, the problem was how to detect yarn breakage. In other words, according to the conventional yarn breakage detection method, a yarn breakage detection sensor is placed at the most downstream doubling yarn winding section (indicated by arrow X in FIG. 4) to detect yarn breakage in this portion. However, in this case, the yarn breakage signal will not be output unless both yarns A and B break, so if only one yarn breaks, this yarn breakage will cause the other yarn to break. There is a problem in that the thread breakage process is not activated until this is triggered, resulting in a delay in response. Also, since it is difficult to determine which thread broke first,
It is not possible to determine which thread is causing the thread breakage, which poses a problem in terms of quality control.

This invention was made in view of the above circumstances, and
A yarn breakage detection method that can immediately detect when one of the yarns is broken when winding different types of yarns, and also identify which yarn broke first. Its purpose is to provide.

[Means for solving problems]

In order to achieve the above object, the yarn breakage detection method of the present invention is such that when two types of yarns A and B spun from a two-spindle spinning device are doubled and wound, one of the yarns before the gold thread is A first yarn breakage detection sensor is provided in the middle of the running of yarn A, and set to output a yarn breakage signal when yarn A breaks. A yarn breakage detection sensor is provided to output a yarn breakage signal when the fineness of the mixed yarn (A+B) decreases below a certain amount, and when yarn A breaks, the first yarn breakage detection sensor outputs a yarn breakage signal. Using the output yarn breakage signal, when yarn B breaks, the yarn breakage signal output from the second yarn breakage detection sensor is used to determine whether yarn A or B has broken. The structure is such that it is possible to determine the

[Effect]

In other words, the present invention has a first method that determines only the discontinuation of the yarn.
A yarn breakage detection sensor and a second yarn breakage detection sensor for determining a quantitative decrease in the fineness of the yarn are prepared, and the first yarn breakage detection sensor is provided in the middle of one of the yarns while the yarn is running. By detecting the presence or absence of yarn breakage in the thread, and by providing the second yarn breakage detection sensor in the middle of the running of the mixed yarn after the yarn is combined to detect the presence or absence of a decrease in the fineness of the mixed yarn, the The feature is that it is possible to determine which of the two types of yarn breaks first. Therefore, the cause of thread breakage can be easily investigated, appropriate quality control can be carried out, and a predetermined thread breakage processing command can be output based on the thread breakage signal output from one of the sensors. This has the advantage that when one of the yarns breaks, appropriate yarn breakage can be carried out immediately.

Next, the present invention will be explained in detail based on examples.

[Embodiment] FIG. 1 shows a device used in an embodiment of the present invention. In FIG. It is designed to detect thread breakage. This yarn breakage detection sensor 41 is, for example, as shown in FIG. One surface facing the light emitting section 43 is formed, and the other surface is formed on the light receiving section 4.
4. Then, the light projecting section 43 and the light receiving section 44
A yarn breakage signal is output when the yarn A passing between the two ends breaks and the amount of light on the light receiving section 44 side changes. An example of such a sensor is the YSL series manufactured by Toyo Denshi Co., Ltd.

Further, 45 is a second yarn breakage detection sensor, which detects yarn breakage at a position just before the mixed fiber yarn (A+B) after being combined and split is wound up.

This yarn breakage detection sensor 45 also has the same basic structure as the first yarn breakage detection sensor 41 (see FIG. 2), but the yarn breakage detection sensor 41 detects that the passing yarn A is 100% broken. In contrast, the yarn breakage detection sensor 45 outputs a yarn breakage signal only when the yarn breakage signal is detected when the fineness of the passing mixed yarn (A+B) decreases to 50% or less even if the yarn is not completely broken. It is set in advance to always output a thread breakage signal. Therefore, this yarn breakage detection sensor 45 detects the following: (1) If yarn A breaks before yarn doubling and only yarn B runs, ■ Similarly, yarn B breaks and only yarn A runs. In this case, ■ Similarly, if yarn A and yarn B break at the same time in their respective paths and do not enter the doubling path and cannot be obtained as a mixed yarn, ■ the mixed yarn (A + B) breaks. A thread breakage signal is output when any of the following four cases apply.

In addition, in FIG. 1, other parts are the same as those in FIG. 4, and the same parts are given the same numbers.

In this device, the yarn breakage state can be determined as shown in the table below by using the yarn breakage signals output from the two yarn breakage detection sensors 41 and 45.

In this way, the output signal of the first yarn breakage detection sensor 41 is used to determine the yarn breakage of yarn A, and the second yarn breakage detection sensor 4
Breakage of yarn B can be determined using the output signal No. 5.

Note that, as described above, the second yarn breakage detection sensor 45 outputs a yarn breakage signal even when yarn A is broken, so in order to prevent this output signal from being used for determining yarn breakage, for example, We have measures such as:

Discrimination of yarn breakage is normally performed based on lamp displays corresponding to output signals from each sensor 41, 45, but the first
The response speed of the second thread breakage detection sensor 45 is set to be slightly slower than the response speed of the thread breakage detection sensor 41. When there is an output from the second yarn breakage detection sensor 45, the setting is made so that the lamp display is not performed depending on the output signals from the second yarn breakage detection sensor 45, etc. Therefore, if the lamp corresponding to the first yarn breakage detection sensor 41 lights up, it can be determined that the yarn A has broken. Conversely, when there is an output from the second yarn breakage detection sensor 45, the lamp is set so that it will not be displayed depending on the output signal from the first yarn breakage detection sensor 41.

Therefore, if the lamp corresponding to the second yarn breakage detection sensor 45 lights up, it can be determined that yarn B has broken.

When a yarn breakage signal is output from each of the sensors 41, 45, an instruction to operate the shutters 46, 47 (return to FIG. 1), and each godet roller 31, 32, 33, .
34, it is preferable to output an instruction to stop the rotation of the winding bobbin 43, etc., so that the thread breakage process can be immediately performed in accordance with the mode of thread breakage.

In the above example, the mixed fiber yarn (A+B) is actually wound in divided small units (
Since it is performed for each C+ to C,), the second thread breakage detection sensor 4
5 is placed in any one of the sections 01 to C8, for example, in the C7 section at the left end indicated by the arrow Y in FIG. It would be better to arrange the same sensor as the second thread breakage detection sensor 45 in all of 01 to C8 for more detailed management. If this occurs, the broken thread jumps into other parts and causes thread breakage in a chain reaction, so thread breakage always occurs in all parts eventually, so the second thread breakage detection sensor 45 One can be said to be sufficient.

Further, in the above embodiment, the second yarn breakage detection sensor 4
5, the yarn breakage signal is set to be output when the fineness of the passing yarn decreases to 50% or less, but the amount of decrease in the fineness that outputs the yarn breakage signal depends on the mixture to be obtained. It is set appropriately depending on the type of yarn. For example, yarn A and yarn B
For a mixed yarn whose fineness ratio is set to A:B=30 near 0, it is necessary to set it so that a yarn breakage signal is output when the fineness decreases to 70% or less.

〔Effect of the invention〕

As described above, since the yarn breakage detection method of the present invention uses two different yarn breakage detection sensors, it is possible to determine which yarn breaks first among the two types of yarns to be combined. be able to. Therefore, it is easy to investigate the cause of the threads, and appropriate quality control can be carried out rationally. In addition, it is possible to issue a predetermined thread breakage processing command based on the thread breakage signal output from either thread breakage detection sensor, so the advantage is that even if one thread breaks, appropriate thread breakage can be performed immediately. has.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing a device used in an embodiment of the present invention, Fig. 2 is a plan view showing an example of a yarn breakage detection sensor used in this invention, and Fig. 3 shows details of the area around the doubling yarn winding section. FIG. 4 is a partial perspective view showing a configuration of a spinning/winding device to which the present invention is applied. 41...First thread breakage detection sensor 45...Second thread breakage detection sensor

Claims (1)

[Claims] (1) Two types of yarn A spun from a two-spindle spinning device,
When doubling and winding yarn B, a first yarn breakage detection sensor is provided in the middle of one of the yarns A before doubling and is set to output a yarn breakage signal when yarn A breaks. At the same time, a second yarn breakage detection sensor is provided in the middle of the running of the mixed yarn (A+B) after the yarn is combined, so that a yarn breakage signal is output when the fineness of the mixed yarn (A+B) decreases below a certain amount. When yarn A breaks, the yarn breakage signal output from the first yarn breakage detection sensor is used, and when yarn B breaks, the yarn breakage signal output from the second yarn breakage detection sensor is used. A yarn breakage detection method characterized in that it is possible to determine which yarn of yarns A and B has broken by using the method.